diff options
Diffstat (limited to 'drivers/block/skd_main.c')
| -rw-r--r-- | drivers/block/skd_main.c | 5432 |
1 files changed, 5432 insertions, 0 deletions
diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c new file mode 100644 index 000000000000..9199c93be926 --- /dev/null +++ b/drivers/block/skd_main.c @@ -0,0 +1,5432 @@ +/* Copyright 2012 STEC, Inc. + * + * This file is licensed under the terms of the 3-clause + * BSD License (http://opensource.org/licenses/BSD-3-Clause) + * or the GNU GPL-2.0 (http://www.gnu.org/licenses/gpl-2.0.html), + * at your option. Both licenses are also available in the LICENSE file + * distributed with this project. This file may not be copied, modified, + * or distributed except in accordance with those terms. + * Gordoni Waidhofer <gwaidhofer@stec-inc.com> + * Initial Driver Design! + * Thomas Swann <tswann@stec-inc.com> + * Interrupt handling. + * Ramprasad Chinthekindi <rchinthekindi@stec-inc.com> + * biomode implementation. + * Akhil Bhansali <abhansali@stec-inc.com> + * Added support for DISCARD / FLUSH and FUA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/blkdev.h> +#include <linux/sched.h> +#include <linux/interrupt.h> +#include <linux/compiler.h> +#include <linux/workqueue.h> +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/time.h> +#include <linux/hdreg.h> +#include <linux/dma-mapping.h> +#include <linux/completion.h> +#include <linux/scatterlist.h> +#include <linux/version.h> +#include <linux/err.h> +#include <linux/scatterlist.h> +#include <linux/aer.h> +#include <linux/ctype.h> +#include <linux/wait.h> +#include <linux/uio.h> +#include <scsi/scsi.h> +#include <scsi/sg.h> +#include <linux/io.h> +#include <linux/uaccess.h> +#include <asm/unaligned.h> + +#include "skd_s1120.h" + +static int skd_dbg_level; +static int skd_isr_comp_limit = 4; + +enum { + STEC_LINK_2_5GTS = 0, + STEC_LINK_5GTS = 1, + STEC_LINK_8GTS = 2, + STEC_LINK_UNKNOWN = 0xFF +}; + +enum { + SKD_FLUSH_INITIALIZER, + SKD_FLUSH_ZERO_SIZE_FIRST, + SKD_FLUSH_DATA_SECOND, +}; + +#define SKD_ASSERT(expr) \ + do { \ + if (unlikely(!(expr))) { \ + pr_err("Assertion failed! %s,%s,%s,line=%d\n", \ + # expr, __FILE__, __func__, __LINE__); \ + } \ + } while (0) + +#define DRV_NAME "skd" +#define DRV_VERSION "2.2.1" +#define DRV_BUILD_ID "0260" +#define PFX DRV_NAME ": " +#define DRV_BIN_VERSION 0x100 +#define DRV_VER_COMPL "2.2.1." DRV_BUILD_ID + +MODULE_AUTHOR("bug-reports: support@stec-inc.com"); +MODULE_LICENSE("Dual BSD/GPL"); + +MODULE_DESCRIPTION("STEC s1120 PCIe SSD block driver (b" DRV_BUILD_ID ")"); +MODULE_VERSION(DRV_VERSION "-" DRV_BUILD_ID); + +#define PCI_VENDOR_ID_STEC 0x1B39 +#define PCI_DEVICE_ID_S1120 0x0001 + +#define SKD_FUA_NV (1 << 1) +#define SKD_MINORS_PER_DEVICE 16 + +#define SKD_MAX_QUEUE_DEPTH 200u + +#define SKD_PAUSE_TIMEOUT (5 * 1000) + +#define SKD_N_FITMSG_BYTES (512u) + +#define SKD_N_SPECIAL_CONTEXT 32u +#define SKD_N_SPECIAL_FITMSG_BYTES (128u) + +/* SG elements are 32 bytes, so we can make this 4096 and still be under the + * 128KB limit. That allows 4096*4K = 16M xfer size + */ +#define SKD_N_SG_PER_REQ_DEFAULT 256u +#define SKD_N_SG_PER_SPECIAL 256u + +#define SKD_N_COMPLETION_ENTRY 256u +#define SKD_N_READ_CAP_BYTES (8u) + +#define SKD_N_INTERNAL_BYTES (512u) + +/* 5 bits of uniqifier, 0xF800 */ +#define SKD_ID_INCR (0x400) +#define SKD_ID_TABLE_MASK (3u << 8u) +#define SKD_ID_RW_REQUEST (0u << 8u) +#define SKD_ID_INTERNAL (1u << 8u) +#define SKD_ID_SPECIAL_REQUEST (2u << 8u) +#define SKD_ID_FIT_MSG (3u << 8u) +#define SKD_ID_SLOT_MASK 0x00FFu +#define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu + +#define SKD_N_TIMEOUT_SLOT 4u +#define SKD_TIMEOUT_SLOT_MASK 3u + +#define SKD_N_MAX_SECTORS 2048u + +#define SKD_MAX_RETRIES 2u + +#define SKD_TIMER_SECONDS(seconds) (seconds) +#define SKD_TIMER_MINUTES(minutes) ((minutes) * (60)) + +#define INQ_STD_NBYTES 36 +#define SKD_DISCARD_CDB_LENGTH 24 + +enum skd_drvr_state { + SKD_DRVR_STATE_LOAD, + SKD_DRVR_STATE_IDLE, + SKD_DRVR_STATE_BUSY, + SKD_DRVR_STATE_STARTING, + SKD_DRVR_STATE_ONLINE, + SKD_DRVR_STATE_PAUSING, + SKD_DRVR_STATE_PAUSED, + SKD_DRVR_STATE_DRAINING_TIMEOUT, + SKD_DRVR_STATE_RESTARTING, + SKD_DRVR_STATE_RESUMING, + SKD_DRVR_STATE_STOPPING, + SKD_DRVR_STATE_FAULT, + SKD_DRVR_STATE_DISAPPEARED, + SKD_DRVR_STATE_PROTOCOL_MISMATCH, + SKD_DRVR_STATE_BUSY_ERASE, + SKD_DRVR_STATE_BUSY_SANITIZE, + SKD_DRVR_STATE_BUSY_IMMINENT, + SKD_DRVR_STATE_WAIT_BOOT, + SKD_DRVR_STATE_SYNCING, +}; + +#define SKD_WAIT_BOOT_TIMO SKD_TIMER_SECONDS(90u) +#define SKD_STARTING_TIMO SKD_TIMER_SECONDS(8u) +#define SKD_RESTARTING_TIMO SKD_TIMER_MINUTES(4u) +#define SKD_DRAINING_TIMO SKD_TIMER_SECONDS(6u) +#define SKD_BUSY_TIMO SKD_TIMER_MINUTES(20u) +#define SKD_STARTED_BUSY_TIMO SKD_TIMER_SECONDS(60u) +#define SKD_START_WAIT_SECONDS 90u + +enum skd_req_state { + SKD_REQ_STATE_IDLE, + SKD_REQ_STATE_SETUP, + SKD_REQ_STATE_BUSY, + SKD_REQ_STATE_COMPLETED, + SKD_REQ_STATE_TIMEOUT, + SKD_REQ_STATE_ABORTED, +}; + +enum skd_fit_msg_state { + SKD_MSG_STATE_IDLE, + SKD_MSG_STATE_BUSY, +}; + +enum skd_check_status_action { + SKD_CHECK_STATUS_REPORT_GOOD, + SKD_CHECK_STATUS_REPORT_SMART_ALERT, + SKD_CHECK_STATUS_REQUEUE_REQUEST, + SKD_CHECK_STATUS_REPORT_ERROR, + SKD_CHECK_STATUS_BUSY_IMMINENT, +}; + +struct skd_fitmsg_context { + enum skd_fit_msg_state state; + + struct skd_fitmsg_context *next; + + u32 id; + u16 outstanding; + + u32 length; + u32 offset; + + u8 *msg_buf; + dma_addr_t mb_dma_address; +}; + +struct skd_request_context { + enum skd_req_state state; + + struct skd_request_context *next; + + u16 id; + u32 fitmsg_id; + + struct request *req; + u8 flush_cmd; + u8 discard_page; + + u32 timeout_stamp; + u8 sg_data_dir; + struct scatterlist *sg; + u32 n_sg; + u32 sg_byte_count; + + struct fit_sg_descriptor *sksg_list; + dma_addr_t sksg_dma_address; + + struct fit_completion_entry_v1 completion; + + struct fit_comp_error_info err_info; + +}; +#define SKD_DATA_DIR_HOST_TO_CARD 1 +#define SKD_DATA_DIR_CARD_TO_HOST 2 +#define SKD_DATA_DIR_NONE 3 /* especially for DISCARD requests. */ + +struct skd_special_context { + struct skd_request_context req; + + u8 orphaned; + + void *data_buf; + dma_addr_t db_dma_address; + + u8 *msg_buf; + dma_addr_t mb_dma_address; +}; + +struct skd_sg_io { + fmode_t mode; + void __user *argp; + + struct sg_io_hdr sg; + + u8 cdb[16]; + + u32 dxfer_len; + u32 iovcnt; + struct sg_iovec *iov; + struct sg_iovec no_iov_iov; + + struct skd_special_context *skspcl; +}; + +typedef enum skd_irq_type { + SKD_IRQ_LEGACY, + SKD_IRQ_MSI, + SKD_IRQ_MSIX +} skd_irq_type_t; + +#define SKD_MAX_BARS 2 + +struct skd_device { + volatile void __iomem *mem_map[SKD_MAX_BARS]; + resource_size_t mem_phys[SKD_MAX_BARS]; + u32 mem_size[SKD_MAX_BARS]; + + skd_irq_type_t irq_type; + u32 msix_count; + struct skd_msix_entry *msix_entries; + + struct pci_dev *pdev; + int pcie_error_reporting_is_enabled; + + spinlock_t lock; + struct gendisk *disk; + struct request_queue *queue; + struct device *class_dev; + int gendisk_on; + int sync_done; + + atomic_t device_count; + u32 devno; + u32 major; + char name[32]; + char isr_name[30]; + + enum skd_drvr_state state; + u32 drive_state; + + u32 in_flight; + u32 cur_max_queue_depth; + u32 queue_low_water_mark; + u32 dev_max_queue_depth; + + u32 num_fitmsg_context; + u32 num_req_context; + + u32 timeout_slot[SKD_N_TIMEOUT_SLOT]; + u32 timeout_stamp; + struct skd_fitmsg_context *skmsg_free_list; + struct skd_fitmsg_context *skmsg_table; + + struct skd_request_context *skreq_free_list; + struct skd_request_context *skreq_table; + + struct skd_special_context *skspcl_free_list; + struct skd_special_context *skspcl_table; + + struct skd_special_context internal_skspcl; + u32 read_cap_blocksize; + u32 read_cap_last_lba; + int read_cap_is_valid; + int inquiry_is_valid; + u8 inq_serial_num[13]; /*12 chars plus null term */ + u8 id_str[80]; /* holds a composite name (pci + sernum) */ + + u8 skcomp_cycle; + u32 skcomp_ix; + struct fit_completion_entry_v1 *skcomp_table; + struct fit_comp_error_info *skerr_table; + dma_addr_t cq_dma_address; + + wait_queue_head_t waitq; + + struct timer_list timer; + u32 timer_countdown; + u32 timer_substate; + + int n_special; + int sgs_per_request; + u32 last_mtd; + + u32 proto_ver; + + int dbg_level; + u32 connect_time_stamp; + int connect_retries; +#define SKD_MAX_CONNECT_RETRIES 16 + u32 drive_jiffies; + + u32 timo_slot; + + + struct work_struct completion_worker; +}; + +#define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF) +#define SKD_READL(DEV, OFF) skd_reg_read32(DEV, OFF) +#define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF) + +static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset) +{ + u32 val; + + if (likely(skdev->dbg_level < 2)) + return readl(skdev->mem_map[1] + offset); + else { + barrier(); + val = readl(skdev->mem_map[1] + offset); + barrier(); + pr_debug("%s:%s:%d offset %x = %x\n", + skdev->name, __func__, __LINE__, offset, val); + return val; + } + +} + +static inline void skd_reg_write32(struct skd_device *skdev, u32 val, + u32 offset) +{ + if (likely(skdev->dbg_level < 2)) { + writel(val, skdev->mem_map[1] + offset); + barrier(); + } else { + barrier(); + writel(val, skdev->mem_map[1] + offset); + barrier(); + pr_debug("%s:%s:%d offset %x = %x\n", + skdev->name, __func__, __LINE__, offset, val); + } +} + +static inline void skd_reg_write64(struct skd_device *skdev, u64 val, + u32 offset) +{ + if (likely(skdev->dbg_level < 2)) { + writeq(val, skdev->mem_map[1] + offset); + barrier(); + } else { + barrier(); + writeq(val, skdev->mem_map[1] + offset); + barrier(); + pr_debug("%s:%s:%d offset %x = %016llx\n", + skdev->name, __func__, __LINE__, offset, val); + } +} + + +#define SKD_IRQ_DEFAULT SKD_IRQ_MSI +static int skd_isr_type = SKD_IRQ_DEFAULT; + +module_param(skd_isr_type, int, 0444); +MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability." + " (0==legacy, 1==MSI, 2==MSI-X, default==1)"); + +#define SKD_MAX_REQ_PER_MSG_DEFAULT 1 +static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT; + +module_param(skd_max_req_per_msg, int, 0444); +MODULE_PARM_DESC(skd_max_req_per_msg, + "Maximum SCSI requests packed in a single message." + " (1-14, default==1)"); + +#define SKD_MAX_QUEUE_DEPTH_DEFAULT 64 +#define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64" +static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT; + +module_param(skd_max_queue_depth, int, 0444); +MODULE_PARM_DESC(skd_max_queue_depth, + "Maximum SCSI requests issued to s1120." + " (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")"); + +static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT; +module_param(skd_sgs_per_request, int, 0444); +MODULE_PARM_DESC(skd_sgs_per_request, + "Maximum SG elements per block request." + " (1-4096, default==256)"); + +static int skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT; +module_param(skd_max_pass_thru, int, 0444); +MODULE_PARM_DESC(skd_max_pass_thru, + "Maximum SCSI pass-thru at a time." " (1-50, default==32)"); + +module_param(skd_dbg_level, int, 0444); +MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)"); + +module_param(skd_isr_comp_limit, int, 0444); +MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4"); + +/* Major device number dynamically assigned. */ +static u32 skd_major; + +static void skd_destruct(struct skd_device *skdev); +static const struct block_device_operations skd_blockdev_ops; +static void skd_send_fitmsg(struct skd_device *skdev, + struct skd_fitmsg_context *skmsg); +static void skd_send_special_fitmsg(struct skd_device *skdev, + struct skd_special_context *skspcl); +static void skd_request_fn(struct request_queue *rq); +static void skd_end_request(struct skd_device *skdev, + struct skd_request_context *skreq, int error); +static int skd_preop_sg_list(struct skd_device *skdev, + struct skd_request_context *skreq); +static void skd_postop_sg_list(struct skd_device *skdev, + struct skd_request_context *skreq); + +static void skd_restart_device(struct skd_device *skdev); +static int skd_quiesce_dev(struct skd_device *skdev); +static int skd_unquiesce_dev(struct skd_device *skdev); +static void skd_release_special(struct skd_device *skdev, + struct skd_special_context *skspcl); +static void skd_disable_interrupts(struct skd_device *skdev); +static void skd_isr_fwstate(struct skd_device *skdev); +static void skd_recover_requests(struct skd_device *skdev, int requeue); +static void skd_soft_reset(struct skd_device *skdev); + +static const char *skd_name(struct skd_device *skdev); +const char *skd_drive_state_to_str(int state); +const char *skd_skdev_state_to_str(enum skd_drvr_state state); +static void skd_log_skdev(struct skd_device *skdev, const char *event); +static void skd_log_skmsg(struct skd_device *skdev, + struct skd_fitmsg_context *skmsg, const char *event); +static void skd_log_skreq(struct skd_device *skdev, + struct skd_request_context *skreq, const char *event); + +/* + ***************************************************************************** + * READ/WRITE REQUESTS + ***************************************************************************** + */ +static void skd_fail_all_pending(struct skd_device *skdev) +{ + struct request_queue *q = skdev->queue; + struct request *req; + + for (;; ) { + req = blk_peek_request(q); + if (req == NULL) + break; + blk_start_request(req); + __blk_end_request_all(req, -EIO); + } +} + +static void +skd_prep_rw_cdb(struct skd_scsi_request *scsi_req, + int data_dir, unsigned lba, + unsigned count) +{ + if (data_dir == READ) + scsi_req->cdb[0] = 0x28; + else + scsi_req->cdb[0] = 0x2a; + + scsi_req->cdb[1] = 0; + scsi_req->cdb[2] = (lba & 0xff000000) >> 24; + scsi_req->cdb[3] = (lba & 0xff0000) >> 16; + scsi_req->cdb[4] = (lba & 0xff00) >> 8; + scsi_req->cdb[5] = (lba & 0xff); + scsi_req->cdb[6] = 0; + scsi_req->cdb[7] = (count & 0xff00) >> 8; + scsi_req->cdb[8] = count & 0xff; + scsi_req->cdb[9] = 0; +} + +static void +skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req, + struct skd_request_context *skreq) +{ + skreq->flush_cmd = 1; + + scsi_req->cdb[0] = 0x35; + scsi_req->cdb[1] = 0; + scsi_req->cdb[2] = 0; + scsi_req->cdb[3] = 0; + scsi_req->cdb[4] = 0; + scsi_req->cdb[5] = 0; + scsi_req->cdb[6] = 0; + scsi_req->cdb[7] = 0; + scsi_req->cdb[8] = 0; + scsi_req->cdb[9] = 0; +} + +static void +skd_prep_discard_cdb(struct skd_scsi_request *scsi_req, + struct skd_request_context *skreq, + struct page *page, + u32 lba, u32 count) +{ + char *buf; + unsigned long len; + struct request *req; + + buf = page_address(page); + len = SKD_DISCARD_CDB_LENGTH; + + scsi_req->cdb[0] = UNMAP; + scsi_req->cdb[8] = len; + + put_unaligned_be16(6 + 16, &buf[0]); + put_unaligned_be16(16, &buf[2]); + put_unaligned_be64(lba, &buf[8]); + put_unaligned_be32(count, &buf[16]); + + req = skreq->req; + blk_add_request_payload(req, page, len); + req->buffer = buf; +} + +static void skd_request_fn_not_online(struct request_queue *q); + +static void skd_request_fn(struct request_queue *q) +{ + struct skd_device *skdev = q->queuedata; + struct skd_fitmsg_context *skmsg = NULL; + struct fit_msg_hdr *fmh = NULL; + struct skd_request_context *skreq; + struct request *req = NULL; + struct skd_scsi_request *scsi_req; + struct page *page; + unsigned long io_flags; + int error; + u32 lba; + u32 count; + int data_dir; + u32 be_lba; + u32 be_count; + u64 be_dmaa; + u64 cmdctxt; + u32 timo_slot; + void *cmd_ptr; + int flush, fua; + + if (skdev->state != SKD_DRVR_STATE_ONLINE) { + skd_request_fn_not_online(q); + return; + } + + if (blk_queue_stopped(skdev->queue)) { + if (skdev->skmsg_free_list == NULL || + skdev->skreq_free_list == NULL || + skdev->in_flight >= skdev->queue_low_water_mark) + /* There is still some kind of shortage */ + return; + + queue_flag_clear(QUEUE_FLAG_STOPPED, skdev->queue); + } + + /* + * Stop conditions: + * - There are no more native requests + * - There are already the maximum number of requests in progress + * - There are no more skd_request_context entries + * - There are no more FIT msg buffers + */ + for (;; ) { + + flush = fua = 0; + + req = blk_peek_request(q); + + /* Are there any native requests to start? */ + if (req == NULL) + break; + + lba = (u32)blk_rq_pos(req); + count = blk_rq_sectors(req); + data_dir = rq_data_dir(req); + io_flags = req->cmd_flags; + + if (io_flags & REQ_FLUSH) + flush++; + + if (io_flags & REQ_FUA) + fua++; + + pr_debug("%s:%s:%d new req=%p lba=%u(0x%x) " + "count=%u(0x%x) dir=%d\n", + skdev->name, __func__, __LINE__, + req, lba, lba, count, count, data_dir); + + /* At this point we know there is a request */ + + /* Are too many requets already in progress? */ + if (skdev->in_flight >= skdev->cur_max_queue_depth) { + pr_debug("%s:%s:%d qdepth %d, limit %d\n", + skdev->name, __func__, __LINE__, + skdev->in_flight, skdev->cur_max_queue_depth); + break; + } + + /* Is a skd_request_context available? */ + skreq = skdev->skreq_free_list; + if (skreq == NULL) { + pr_debug("%s:%s:%d Out of req=%p\n", + skdev->name, __func__, __LINE__, q); + break; + } + SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE); + SKD_ASSERT((skreq->id & SKD_ID_INCR) == 0); + + /* Now we check to see if we can get a fit msg */ + if (skmsg == NULL) { + if (skdev->skmsg_free_list == NULL) { + pr_debug("%s:%s:%d Out of msg\n", + skdev->name, __func__, __LINE__); + break; + } + } + + skreq->flush_cmd = 0; + skreq->n_sg = 0; + skreq->sg_byte_count = 0; + skreq->discard_page = 0; + + /* + * OK to now dequeue request from q. + * + * At this point we are comitted to either start or reject + * the native request. Note that skd_request_context is + * available but is still at the head of the free list. + */ + blk_start_request(req); + skreq->req = req; + skreq->fitmsg_id = 0; + + /* Either a FIT msg is in progress or we have to start one. */ + if (skmsg == NULL) { + /* Are there any FIT msg buffers available? */ + skmsg = skdev->skmsg_free_list; + if (skmsg == NULL) { + pr_debug("%s:%s:%d Out of msg skdev=%p\n", + skdev->name, __func__, __LINE__, + skdev); + break; + } + SKD_ASSERT(skmsg->state == SKD_MSG_STATE_IDLE); + SKD_ASSERT((skmsg->id & SKD_ID_INCR) == 0); + + skdev->skmsg_free_list = skmsg->next; + + skmsg->state = SKD_MSG_STATE_BUSY; + skmsg->id += SKD_ID_INCR; + + /* Initialize the FIT msg header */ + fmh = (struct fit_msg_hdr *)skmsg->msg_buf; + memset(fmh, 0, sizeof(*fmh)); + fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT; + skmsg->length = sizeof(*fmh); + } + + skreq->fitmsg_id = skmsg->id; + + /* + * Note that a FIT msg may have just been started + * but contains no SoFIT requests yet. + */ + + /* + * Transcode the request, checking as we go. The outcome of + * the transcoding is represented by the error variable. + */ + cmd_ptr = &skmsg->msg_buf[skmsg->length]; + memset(cmd_ptr, 0, 32); + + be_lba = cpu_to_be32(lba); + be_count = cpu_to_be32(count); + be_dmaa = cpu_to_be64((u64)skreq->sksg_dma_address); + cmdctxt = skreq->id + SKD_ID_INCR; + + scsi_req = cmd_ptr; + scsi_req->hdr.tag = cmdctxt; + scsi_req->hdr.sg_list_dma_address = be_dmaa; + + if (data_dir == READ) + skreq->sg_data_dir = SKD_DATA_DIR_CARD_TO_HOST; + else + skreq->sg_data_dir = SKD_DATA_DIR_HOST_TO_CARD; + + if (io_flags & REQ_DISCARD) { + page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!page) { + pr_err("request_fn:Page allocation failed.\n"); + skd_end_request(skdev, skreq, -ENOMEM); + break; + } + skreq->discard_page = 1; + skd_prep_discard_cdb(scsi_req, skreq, page, lba, count); + + } else if (flush == SKD_FLUSH_ZERO_SIZE_FIRST) { + skd_prep_zerosize_flush_cdb(scsi_req, skreq); + SKD_ASSERT(skreq->flush_cmd == 1); + + } else { + skd_prep_rw_cdb(scsi_req, data_dir, lba, count); + } + + if (fua) + scsi_req->cdb[1] |= SKD_FUA_NV; + + if (!req->bio) + goto skip_sg; + + error = skd_preop_sg_list(skdev, skreq); + + if (error != 0) { + /* + * Complete the native request with error. + * Note that the request context is still at the + * head of the free list, and that the SoFIT request + * was encoded into the FIT msg buffer but the FIT + * msg length has not been updated. In short, the + * only resource that has been allocated but might + * not be used is that the FIT msg could be empty. + */ + pr_debug("%s:%s:%d error Out\n", + skdev->name, __func__, __LINE__); + skd_end_request(skdev, skreq, error); + continue; + } + +skip_sg: + scsi_req->hdr.sg_list_len_bytes = + cpu_to_be32(skreq->sg_byte_count); + + /* Complete resource allocations. */ + skdev->skreq_free_list = skreq->next; + skreq->state = SKD_REQ_STATE_BUSY; + skreq->id += SKD_ID_INCR; + + skmsg->length += sizeof(struct skd_scsi_request); + fmh->num_protocol_cmds_coalesced++; + + /* + * Update the active request counts. + * Capture the timeout timestamp. + */ + skreq->timeout_stamp = skdev->timeout_stamp; + timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK; + skdev->timeout_slot[timo_slot]++; + skdev->in_flight++; + pr_debug("%s:%s:%d req=0x%x busy=%d\n", + skdev->name, __func__, __LINE__, + skreq->id, skdev->in_flight); + + /* + * If the FIT msg buffer is full send it. + */ + if (skmsg->length >= SKD_N_FITMSG_BYTES || + fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) { + skd_send_fitmsg(skdev, skmsg); + skmsg = NULL; + fmh = NULL; + } + } + + /* + * Is a FIT msg in progress? If it is empty put the buffer back + * on the free list. If it is non-empty send what we got. + * This minimizes latency when there are fewer requests than + * what fits in a FIT msg. + */ + if (skmsg != NULL) { + /* Bigger than just a FIT msg header? */ + if (skmsg->length > sizeof(struct fit_msg_hdr)) { + pr_debug("%s:%s:%d sending msg=%p, len %d\n", + skdev->name, __func__, __LINE__, + skmsg, skmsg->length); + skd_send_fitmsg(skdev, skmsg); + } else { + /* + * The FIT msg is empty. It means we got started + * on the msg, but the requests were rejected. + */ + skmsg->state = SKD_MSG_STATE_IDLE; + skmsg->id += SKD_ID_INCR; + skmsg->next = skdev->skmsg_free_list; + skdev->skmsg_free_list = skmsg; + } + skmsg = NULL; + fmh = NULL; + } + + /* + * If req is non-NULL it means there is something to do but + * we are out of a resource. + */ + if (req) + blk_stop_queue(skdev->queue); +} + +static void skd_end_request(struct skd_device *skdev, + struct skd_request_context *skreq, int error) +{ + struct request *req = skreq->req; + unsigned int io_flags = req->cmd_flags; + + if ((io_flags & REQ_DISCARD) && + (skreq->discard_page == 1)) { + pr_debug("%s:%s:%d, free the page!", + skdev->name, __func__, __LINE__); + free_page((unsigned long)req->buffer); + req->buffer = NULL; + } + + if (unlikely(error)) { + struct request *req = skreq->req; + char *cmd = (rq_data_dir(req) == READ) ? "read" : "write"; + u32 lba = (u32)blk_rq_pos(req); + u32 count = blk_rq_sectors(req); + + pr_err("(%s): Error cmd=%s sect=%u count=%u id=0x%x\n", + skd_name(skdev), cmd, lba, count, skreq->id); + } else + pr_debug("%s:%s:%d id=0x%x error=%d\n", + skdev->name, __func__, __LINE__, skreq->id, error); + + __blk_end_request_all(skreq->req, error); +} + +static int skd_preop_sg_list(struct skd_device *skdev, + struct skd_request_context *skreq) +{ + struct request *req = skreq->req; + int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD; + int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE; + struct scatterlist *sg = &skreq->sg[0]; + int n_sg; + int i; + + skreq->sg_byte_count = 0; + + /* SKD_ASSERT(skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD || + skreq->sg_data_dir == SKD_DATA_DIR_CARD_TO_HOST); */ + + n_sg = blk_rq_map_sg(skdev->queue, req, sg); + if (n_sg <= 0) + return -EINVAL; + + /* + * Map scatterlist to PCI bus addresses. + * Note PCI might change the number of entries. + */ + n_sg = pci_map_sg(skdev->pdev, sg, n_sg, pci_dir); + if (n_sg <= 0) + return -EINVAL; + + SKD_ASSERT(n_sg <= skdev->sgs_per_request); + + skreq->n_sg = n_sg; + + for (i = 0; i < n_sg; i++) { + struct fit_sg_descriptor *sgd = &skreq->sksg_list[i]; + u32 cnt = sg_dma_len(&sg[i]); + uint64_t dma_addr = sg_dma_address(&sg[i]); + + sgd->control = FIT_SGD_CONTROL_NOT_LAST; + sgd->byte_count = cnt; + skreq->sg_byte_count += cnt; + sgd->host_side_addr = dma_addr; + sgd->dev_side_addr = 0; + } + + skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL; + skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST; + + if (unlikely(skdev->dbg_level > 1)) { + pr_debug("%s:%s:%d skreq=%x sksg_list=%p sksg_dma=%llx\n", + skdev->name, __func__, __LINE__, + skreq->id, skreq->sksg_list, skreq->sksg_dma_address); + for (i = 0; i < n_sg; i++) { + struct fit_sg_descriptor *sgd = &skreq->sksg_list[i]; + pr_debug("%s:%s:%d sg[%d] count=%u ctrl=0x%x " + "addr=0x%llx next=0x%llx\n", + skdev->name, __func__, __LINE__, + i, sgd->byte_count, sgd->control, + sgd->host_side_addr, sgd->next_desc_ptr); + } + } + + return 0; +} + +static void skd_postop_sg_list(struct skd_device *skdev, + struct skd_request_context *skreq) +{ + int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD; + int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE; + + /* + * restore the next ptr for next IO request so we + * don't have to set it every time. + */ + skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr = + skreq->sksg_dma_address + + ((skreq->n_sg) * sizeof(struct fit_sg_descriptor)); + pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, pci_dir); +} + +static void skd_request_fn_not_online(struct request_queue *q) +{ + struct skd_device *skdev = q->queuedata; + int error; + + SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE); + + skd_log_skdev(skdev, "req_not_online"); + switch (skdev->state) { + case SKD_DRVR_STATE_PAUSING: + case SKD_DRVR_STATE_PAUSED: + case SKD_DRVR_STATE_STARTING: + case SKD_DRVR_STATE_RESTARTING: + case SKD_DRVR_STATE_WAIT_BOOT: + /* In case of starting, we haven't started the queue, + * so we can't get here... but requests are + * possibly hanging out waiting for us because we + * reported the dev/skd0 already. They'll wait + * forever if connect doesn't complete. + * What to do??? delay dev/skd0 ?? + */ + case SKD_DRVR_STATE_BUSY: + case SKD_DRVR_STATE_BUSY_IMMINENT: + case SKD_DRVR_STATE_BUSY_ERASE: + case SKD_DRVR_STATE_DRAINING_TIMEOUT: + return; + + case SKD_DRVR_STATE_BUSY_SANITIZE: + case SKD_DRVR_STATE_STOPPING: + case SKD_DRVR_STATE_SYNCING: + case SKD_DRVR_STATE_FAULT: + case SKD_DRVR_STATE_DISAPPEARED: + default: + error = -EIO; + break; + } + + /* If we get here, terminate all pending block requeusts + * with EIO and any scsi pass thru with appropriate sense + */ + + skd_fail_all_pending(skdev); +} + +/* + ***************************************************************************** + * TIMER + ***************************************************************************** + */ + +static void skd_timer_tick_not_online(struct skd_device *skdev); + +static void skd_timer_tick(ulong arg) +{ + struct skd_device *skdev = (struct skd_device *)arg; + + u32 timo_slot; + u32 overdue_timestamp; + unsigned long reqflags; + u32 state; + + if (skdev->state == SKD_DRVR_STATE_FAULT) + /* The driver has declared fault, and we want it to + * stay that way until driver is reloaded. + */ + return; + + spin_lock_irqsave(&skdev->lock, reqflags); + + state = SKD_READL(skdev, FIT_STATUS); + state &= FIT_SR_DRIVE_STATE_MASK; + if (state != skdev->drive_state) + skd_isr_fwstate(skdev); + + if (skdev->state != SKD_DRVR_STATE_ONLINE) { + skd_timer_tick_not_online(skdev); + goto timer_func_out; + } + skdev->timeout_stamp++; + timo_slot = skdev->timeout_stamp & SKD_TIMEOUT_SLOT_MASK; + + /* + * All requests that happened during the previous use of + * this slot should be done by now. The previous use was + * over 7 seconds ago. + */ + if (skdev->timeout_slot[timo_slot] == 0) + goto timer_func_out; + + /* Something is overdue */ + overdue_timestamp = skdev->timeout_stamp - SKD_N_TIMEOUT_SLOT; + + pr_debug("%s:%s:%d found %d timeouts, draining busy=%d\n", + skdev->name, __func__, __LINE__, + skdev->timeout_slot[timo_slot], skdev->in_flight); + pr_err("(%s): Overdue IOs (%d), busy %d\n", + skd_name(skdev), skdev->timeout_slot[timo_slot], + skdev->in_flight); + + skdev->timer_countdown = SKD_DRAINING_TIMO; + skdev->state = SKD_DRVR_STATE_DRAINING_TIMEOUT; + skdev->timo_slot = timo_slot; + blk_stop_queue(skdev->queue); + +timer_func_out: + mod_timer(&skdev->timer, (jiffies + HZ)); + + spin_unlock_irqrestore(&skdev->lock, reqflags); +} + +static void skd_timer_tick_not_online(struct skd_device *skdev) +{ + switch (skdev->state) { + case SKD_DRVR_STATE_IDLE: + case SKD_DRVR_STATE_LOAD: + break; + case SKD_DRVR_STATE_BUSY_SANITIZE: + pr_debug("%s:%s:%d drive busy sanitize[%x], driver[%x]\n", + skdev->name, __func__, __LINE__, + skdev->drive_state, skdev->state); + /* If we've been in sanitize for 3 seconds, we figure we're not + * going to get anymore completions, so recover requests now + */ + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + skd_recover_requests(skdev, 0); + break; + + case SKD_DRVR_STATE_BUSY: + case SKD_DRVR_STATE_BUSY_IMMINENT: + case SKD_DRVR_STATE_BUSY_ERASE: + pr_debug("%s:%s:%d busy[%x], countdown=%d\n", + skdev->name, __func__, __LINE__, + skdev->state, skdev->timer_countdown); + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + pr_debug("%s:%s:%d busy[%x], timedout=%d, restarting device.", + skdev->name, __func__, __LINE__, + skdev->state, skdev->timer_countdown); + skd_restart_device(skdev); + break; + + case SKD_DRVR_STATE_WAIT_BOOT: + case SKD_DRVR_STATE_STARTING: + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + /* For now, we fault the drive. Could attempt resets to + * revcover at some point. */ + skdev->state = SKD_DRVR_STATE_FAULT; + + pr_err("(%s): DriveFault Connect Timeout (%x)\n", + skd_name(skdev), skdev->drive_state); + + /*start the queue so we can respond with error to requests */ + /* wakeup anyone waiting for startup complete */ + blk_start_queue(skdev->queue); + skdev->gendisk_on = -1; + wake_up_interruptible(&skdev->waitq); + break; + + case SKD_DRVR_STATE_ONLINE: + /* shouldn't get here. */ + break; + + case SKD_DRVR_STATE_PAUSING: + case SKD_DRVR_STATE_PAUSED: + break; + + case SKD_DRVR_STATE_DRAINING_TIMEOUT: + pr_debug("%s:%s:%d " + "draining busy [%d] tick[%d] qdb[%d] tmls[%d]\n", + skdev->name, __func__, __LINE__, + skdev->timo_slot, + skdev->timer_countdown, + skdev->in_flight, + skdev->timeout_slot[skdev->timo_slot]); + /* if the slot has cleared we can let the I/O continue */ + if (skdev->timeout_slot[skdev->timo_slot] == 0) { + pr_debug("%s:%s:%d Slot drained, starting queue.\n", + skdev->name, __func__, __LINE__); + skdev->state = SKD_DRVR_STATE_ONLINE; + blk_start_queue(skdev->queue); + return; + } + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + skd_restart_device(skdev); + break; + + case SKD_DRVR_STATE_RESTARTING: + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + /* For now, we fault the drive. Could attempt resets to + * revcover at some point. */ + skdev->state = SKD_DRVR_STATE_FAULT; + pr_err("(%s): DriveFault Reconnect Timeout (%x)\n", + skd_name(skdev), skdev->drive_state); + + /* + * Recovering does two things: + * 1. completes IO with error + * 2. reclaims dma resources + * When is it safe to recover requests? + * - if the drive state is faulted + * - if the state is still soft reset after out timeout + * - if the drive registers are dead (state = FF) + * If it is "unsafe", we still need to recover, so we will + * disable pci bus mastering and disable our interrupts. + */ + + if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) || + (skdev->drive_state == FIT_SR_DRIVE_FAULT) || + (skdev->drive_state == FIT_SR_DRIVE_STATE_MASK)) + /* It never came out of soft reset. Try to + * recover the requests and then let them + * fail. This is to mitigate hung processes. */ + skd_recover_requests(skdev, 0); + else { + pr_err("(%s): Disable BusMaster (%x)\n", + skd_name(skdev), skdev->drive_state); + pci_disable_device(skdev->pdev); + skd_disable_interrupts(skdev); + skd_recover_requests(skdev, 0); + } + + /*start the queue so we can respond with error to requests */ + /* wakeup anyone waiting for startup complete */ + blk_start_queue(skdev->queue); + skdev->gendisk_on = -1; + wake_up_interruptible(&skdev->waitq); + break; + + case SKD_DRVR_STATE_RESUMING: + case SKD_DRVR_STATE_STOPPING: + case SKD_DRVR_STATE_SYNCING: + case SKD_DRVR_STATE_FAULT: + case SKD_DRVR_STATE_DISAPPEARED: + default: + break; + } +} + +static int skd_start_timer(struct skd_device *skdev) +{ + int rc; + + init_timer(&skdev->timer); + setup_timer(&skdev->timer, skd_timer_tick, (ulong)skdev); + + rc = mod_timer(&skdev->timer, (jiffies + HZ)); + if (rc) + pr_err("%s: failed to start timer %d\n", + __func__, rc); + return rc; +} + +static void skd_kill_timer(struct skd_device *skdev) +{ + del_timer_sync(&skdev->timer); +} + +/* + ***************************************************************************** + * IOCTL + ***************************************************************************** + */ +static int skd_ioctl_sg_io(struct skd_device *skdev, + fmode_t mode, void __user *argp); +static int skd_sg_io_get_and_check_args(struct skd_device *skdev, + struct skd_sg_io *sksgio); +static int skd_sg_io_obtain_skspcl(struct skd_device *skdev, + struct skd_sg_io *sksgio); +static int skd_sg_io_prep_buffering(struct skd_device *skdev, + struct skd_sg_io *sksgio); +static int skd_sg_io_copy_buffer(struct skd_device *skdev, + struct skd_sg_io *sksgio, int dxfer_dir); +static int skd_sg_io_send_fitmsg(struct skd_device *skdev, + struct skd_sg_io *sksgio); +static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio); +static int skd_sg_io_release_skspcl(struct skd_device *skdev, + struct skd_sg_io *sksgio); +static int skd_sg_io_put_status(struct skd_device *skdev, + struct skd_sg_io *sksgio); + +static void skd_complete_special(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 + *skcomp, + volatile struct fit_comp_error_info *skerr, + struct skd_special_context *skspcl); + +static int skd_bdev_ioctl(struct block_device *bdev, fmode_t mode, + uint cmd_in, ulong arg) +{ + int rc = 0; + struct gendisk *disk = bdev->bd_disk; + struct skd_device *skdev = disk->private_data; + void __user *p = (void *)arg; + + pr_debug("%s:%s:%d %s: CMD[%s] ioctl mode 0x%x, cmd 0x%x arg %0lx\n", + skdev->name, __func__, __LINE__, + disk->disk_name, current->comm, mode, cmd_in, arg); + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + switch (cmd_in) { + case SG_SET_TIMEOUT: + case SG_GET_TIMEOUT: + case SG_GET_VERSION_NUM: + rc = scsi_cmd_ioctl(disk->queue, disk, mode, cmd_in, p); + break; + case SG_IO: + rc = skd_ioctl_sg_io(skdev, mode, p); + break; + + default: + rc = -ENOTTY; + break; + } + + pr_debug("%s:%s:%d %s: completion rc %d\n", + skdev->name, __func__, __LINE__, disk->disk_name, rc); + return rc; +} + +static int skd_ioctl_sg_io(struct skd_device *skdev, fmode_t mode, + void __user *argp) +{ + int rc; + struct skd_sg_io sksgio; + + memset(&sksgio, 0, sizeof(sksgio)); + sksgio.mode = mode; + sksgio.argp = argp; + sksgio.iov = &sksgio.no_iov_iov; + + switch (skdev->state) { + case SKD_DRVR_STATE_ONLINE: + case SKD_DRVR_STATE_BUSY_IMMINENT: + break; + + default: + pr_debug("%s:%s:%d drive not online\n", + skdev->name, __func__, __LINE__); + rc = -ENXIO; + goto out; + } + + rc = skd_sg_io_get_and_check_args(skdev, &sksgio); + if (rc) + goto out; + + rc = skd_sg_io_obtain_skspcl(skdev, &sksgio); + if (rc) + goto out; + + rc = skd_sg_io_prep_buffering(skdev, &sksgio); + if (rc) + goto out; + + rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_TO_DEV); + if (rc) + goto out; + + rc = skd_sg_io_send_fitmsg(skdev, &sksgio); + if (rc) + goto out; + + rc = skd_sg_io_await(skdev, &sksgio); + if (rc) + goto out; + + rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_FROM_DEV); + if (rc) + goto out; + + rc = skd_sg_io_put_status(skdev, &sksgio); + if (rc) + goto out; + + rc = 0; + +out: + skd_sg_io_release_skspcl(skdev, &sksgio); + + if (sksgio.iov != NULL && sksgio.iov != &sksgio.no_iov_iov) + kfree(sksgio.iov); + return rc; +} + +static int skd_sg_io_get_and_check_args(struct skd_device *skdev, + struct skd_sg_io *sksgio) +{ + struct sg_io_hdr *sgp = &sksgio->sg; + int i, acc; + + if (!access_ok(VERIFY_WRITE, sksgio->argp, sizeof(sg_io_hdr_t))) { + pr_debug("%s:%s:%d access sg failed %p\n", + skdev->name, __func__, __LINE__, sksgio->argp); + return -EFAULT; + } + + if (__copy_from_user(sgp, sksgio->argp, sizeof(sg_io_hdr_t))) { + pr_debug("%s:%s:%d copy_from_user sg failed %p\n", + skdev->name, __func__, __LINE__, sksgio->argp); + return -EFAULT; + } + + if (sgp->interface_id != SG_INTERFACE_ID_ORIG) { + pr_debug("%s:%s:%d interface_id invalid 0x%x\n", + skdev->name, __func__, __LINE__, sgp->interface_id); + return -EINVAL; + } + + if (sgp->cmd_len > sizeof(sksgio->cdb)) { + pr_debug("%s:%s:%d cmd_len invalid %d\n", + skdev->name, __func__, __LINE__, sgp->cmd_len); + return -EINVAL; + } + + if (sgp->iovec_count > 256) { + pr_debug("%s:%s:%d iovec_count invalid %d\n", + skdev->name, __func__, __LINE__, sgp->iovec_count); + return -EINVAL; + } + + if (sgp->dxfer_len > (PAGE_SIZE * SKD_N_SG_PER_SPECIAL)) { + pr_debug("%s:%s:%d dxfer_len invalid %d\n", + skdev->name, __func__, __LINE__, sgp->dxfer_len); + return -EINVAL; + } + + switch (sgp->dxfer_direction) { + case SG_DXFER_NONE: + acc = -1; + break; + + case SG_DXFER_TO_DEV: + acc = VERIFY_READ; + break; + + case SG_DXFER_FROM_DEV: + case SG_DXFER_TO_FROM_DEV: + acc = VERIFY_WRITE; + break; + + default: + pr_debug("%s:%s:%d dxfer_dir invalid %d\n", + skdev->name, __func__, __LINE__, sgp->dxfer_direction); + return -EINVAL; + } + + if (copy_from_user(sksgio->cdb, sgp->cmdp, sgp->cmd_len)) { + pr_debug("%s:%s:%d copy_from_user cmdp failed %p\n", + skdev->name, __func__, __LINE__, sgp->cmdp); + return -EFAULT; + } + + if (sgp->mx_sb_len != 0) { + if (!access_ok(VERIFY_WRITE, sgp->sbp, sgp->mx_sb_len)) { + pr_debug("%s:%s:%d access sbp failed %p\n", + skdev->name, __func__, __LINE__, sgp->sbp); + return -EFAULT; + } + } + + if (sgp->iovec_count == 0) { + sksgio->iov[0].iov_base = sgp->dxferp; + sksgio->iov[0].iov_len = sgp->dxfer_len; + sksgio->iovcnt = 1; + sksgio->dxfer_len = sgp->dxfer_len; + } else { + struct sg_iovec *iov; + uint nbytes = sizeof(*iov) * sgp->iovec_count; + size_t iov_data_len; + + iov = kmalloc(nbytes, GFP_KERNEL); + if (iov == NULL) { + pr_debug("%s:%s:%d alloc iovec failed %d\n", + skdev->name, __func__, __LINE__, + sgp->iovec_count); + return -ENOMEM; + } + sksgio->iov = iov; + sksgio->iovcnt = sgp->iovec_count; + + if (copy_from_user(iov, sgp->dxferp, nbytes)) { + pr_debug("%s:%s:%d copy_from_user iovec failed %p\n", + skdev->name, __func__, __LINE__, sgp->dxferp); + return -EFAULT; + } + + /* + * Sum up the vecs, making sure they don't overflow + */ + iov_data_len = 0; + for (i = 0; i < sgp->iovec_count; i++) { + if (iov_data_len + iov[i].iov_len < iov_data_len) + return -EINVAL; + iov_data_len += iov[i].iov_len; + } + + /* SG_IO howto says that the shorter of the two wins */ + if (sgp->dxfer_len < iov_data_len) { + sksgio->iovcnt = iov_shorten((struct iovec *)iov, + sgp->iovec_count, + sgp->dxfer_len); + sksgio->dxfer_len = sgp->dxfer_len; + } else + sksgio->dxfer_len = iov_data_len; + } + + if (sgp->dxfer_direction != SG_DXFER_NONE) { + struct sg_iovec *iov = sksgio->iov; + for (i = 0; i < sksgio->iovcnt; i++, iov++) { + if (!access_ok(acc, iov->iov_base, iov->iov_len)) { + pr_debug("%s:%s:%d access data failed %p/%d\n", + skdev->name, __func__, __LINE__, + iov->iov_base, (int)iov->iov_len); + return -EFAULT; + } + } + } + + return 0; +} + +static int skd_sg_io_obtain_skspcl(struct skd_device *skdev, + struct skd_sg_io *sksgio) +{ + struct skd_special_context *skspcl = NULL; + int rc; + + for (;;) { + ulong flags; + + spin_lock_irqsave(&skdev->lock, flags); + skspcl = skdev->skspcl_free_list; + if (skspcl != NULL) { + skdev->skspcl_free_list = + (struct skd_special_context *)skspcl->req.next; + skspcl->req.id += SKD_ID_INCR; + skspcl->req.state = SKD_REQ_STATE_SETUP; + skspcl->orphaned = 0; + skspcl->req.n_sg = 0; + } + spin_unlock_irqrestore(&skdev->lock, flags); + + if (skspcl != NULL) { + rc = 0; + break; + } + + pr_debug("%s:%s:%d blocking\n", + skdev->name, __func__, __LINE__); + + rc = wait_event_interruptible_timeout( + skdev->waitq, + (skdev->skspcl_free_list != NULL), + msecs_to_jiffies(sksgio->sg.timeout)); + + pr_debug("%s:%s:%d unblocking, rc=%d\n", + skdev->name, __func__, __LINE__, rc); + + if (rc <= 0) { + if (rc == 0) + rc = -ETIMEDOUT; + else + rc = -EINTR; + break; + } + /* + * If we get here rc > 0 meaning the timeout to + * wait_event_interruptible_timeout() had time left, hence the + * sought event -- non-empty free list -- happened. + * Retry the allocation. + */ + } + sksgio->skspcl = skspcl; + + return rc; +} + +static int skd_skreq_prep_buffering(struct skd_device *skdev, + struct skd_request_context *skreq, + u32 dxfer_len) +{ + u32 resid = dxfer_len; + + /* + * The DMA engine must have aligned addresses and byte counts. + */ + resid += (-resid) & 3; + skreq->sg_byte_count = resid; + + skreq->n_sg = 0; + + while (resid > 0) { + u32 nbytes = PAGE_SIZE; + u32 ix = skreq->n_sg; + struct scatterlist *sg = &skreq->sg[ix]; + struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix]; + struct page *page; + + if (nbytes > resid) + nbytes = resid; + + page = alloc_page(GFP_KERNEL); + if (page == NULL) + return -ENOMEM; + + sg_set_page(sg, page, nbytes, 0); + + /* TODO: This should be going through a pci_???() + * routine to do proper mapping. */ + sksg->control = FIT_SGD_CONTROL_NOT_LAST; + sksg->byte_count = nbytes; + + sksg->host_side_addr = sg_phys(sg); + + sksg->dev_side_addr = 0; + sksg->next_desc_ptr = skreq->sksg_dma_address + + (ix + 1) * sizeof(*sksg); + + skreq->n_sg++; + resid -= nbytes; + } + + if (skreq->n_sg > 0) { + u32 ix = skreq->n_sg - 1; + struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix]; + + sksg->control = FIT_SGD_CONTROL_LAST; + sksg->next_desc_ptr = 0; + } + + if (unlikely(skdev->dbg_level > 1)) { + u32 i; + + pr_debug("%s:%s:%d skreq=%x sksg_list=%p sksg_dma=%llx\n", + skdev->name, __func__, __LINE__, + skreq->id, skreq->sksg_list, skreq->sksg_dma_address); + for (i = 0; i < skreq->n_sg; i++) { + struct fit_sg_descriptor *sgd = &skreq->sksg_list[i]; + + pr_debug("%s:%s:%d sg[%d] count=%u ctrl=0x%x " + "addr=0x%llx next=0x%llx\n", + skdev->name, __func__, __LINE__, + i, sgd->byte_count, sgd->control, + sgd->host_side_addr, sgd->next_desc_ptr); + } + } + + return 0; +} + +static int skd_sg_io_prep_buffering(struct skd_device *skdev, + struct skd_sg_io *sksgio) +{ + struct skd_special_context *skspcl = sksgio->skspcl; + struct skd_request_context *skreq = &skspcl->req; + u32 dxfer_len = sksgio->dxfer_len; + int rc; + + rc = skd_skreq_prep_buffering(skdev, skreq, dxfer_len); + /* + * Eventually, errors or not, skd_release_special() is called + * to recover allocations including partial allocations. + */ + return rc; +} + +static int skd_sg_io_copy_buffer(struct skd_device *skdev, + struct skd_sg_io *sksgio, int dxfer_dir) +{ + struct skd_special_context *skspcl = sksgio->skspcl; + u32 iov_ix = 0; + struct sg_iovec curiov; + u32 sksg_ix = 0; + u8 *bufp = NULL; + u32 buf_len = 0; + u32 resid = sksgio->dxfer_len; + int rc; + + curiov.iov_len = 0; + curiov.iov_base = NULL; + + if (dxfer_dir != sksgio->sg.dxfer_direction) { + if (dxfer_dir != SG_DXFER_TO_DEV || + sksgio->sg.dxfer_direction != SG_DXFER_TO_FROM_DEV) + return 0; + } + + while (resid > 0) { + u32 nbytes = PAGE_SIZE; + + if (curiov.iov_len == 0) { + curiov = sksgio->iov[iov_ix++]; + continue; + } + + if (buf_len == 0) { + struct page *page; + page = sg_page(&skspcl->req.sg[sksg_ix++]); + bufp = page_address(page); + buf_len = PAGE_SIZE; + } + + nbytes = min_t(u32, nbytes, resid); + nbytes = min_t(u32, nbytes, curiov.iov_len); + nbytes = min_t(u32, nbytes, buf_len); + + if (dxfer_dir == SG_DXFER_TO_DEV) + rc = __copy_from_user(bufp, curiov.iov_base, nbytes); + else + rc = __copy_to_user(curiov.iov_base, bufp, nbytes); + + if (rc) + return -EFAULT; + + resid -= nbytes; + curiov.iov_len -= nbytes; + curiov.iov_base += nbytes; + buf_len -= nbytes; + } + + return 0; +} + +static int skd_sg_io_send_fitmsg(struct skd_device *skdev, + struct skd_sg_io *sksgio) +{ + struct skd_special_context *skspcl = sksgio->skspcl; + struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf; + struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1]; + + memset(skspcl->msg_buf, 0, SKD_N_SPECIAL_FITMSG_BYTES); + + /* Initialize the FIT msg header */ + fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT; + fmh->num_protocol_cmds_coalesced = 1; + + /* Initialize the SCSI request */ + if (sksgio->sg.dxfer_direction != SG_DXFER_NONE) + scsi_req->hdr.sg_list_dma_address = + cpu_to_be64(skspcl->req.sksg_dma_address); + scsi_req->hdr.tag = skspcl->req.id; + scsi_req->hdr.sg_list_len_bytes = + cpu_to_be32(skspcl->req.sg_byte_count); + memcpy(scsi_req->cdb, sksgio->cdb, sizeof(scsi_req->cdb)); + + skspcl->req.state = SKD_REQ_STATE_BUSY; + skd_send_special_fitmsg(skdev, skspcl); + + return 0; +} + +static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio) +{ + unsigned long flags; + int rc; + + rc = wait_event_interruptible_timeout(skdev->waitq, + (sksgio->skspcl->req.state != + SKD_REQ_STATE_BUSY), + msecs_to_jiffies(sksgio->sg. + timeout)); + + spin_lock_irqsave(&skdev->lock, flags); + + if (sksgio->skspcl->req.state == SKD_REQ_STATE_ABORTED) { + pr_debug("%s:%s:%d skspcl %p aborted\n", + skdev->name, __func__, __LINE__, sksgio->skspcl); + + /* Build check cond, sense and let command finish. */ + /* For a timeout, we must fabricate completion and sense + * data to complete the command */ + sksgio->skspcl->req.completion.status = + SAM_STAT_CHECK_CONDITION; + + memset(&sksgio->skspcl->req.err_info, 0, + sizeof(sksgio->skspcl->req.err_info)); + sksgio->skspcl->req.err_info.type = 0x70; + sksgio->skspcl->req.err_info.key = ABORTED_COMMAND; + sksgio->skspcl->req.err_info.code = 0x44; + sksgio->skspcl->req.err_info.qual = 0; + rc = 0; + } else if (sksgio->skspcl->req.state != SKD_REQ_STATE_BUSY) + /* No longer on the adapter. We finish. */ + rc = 0; + else { + /* Something's gone wrong. Still busy. Timeout or + * user interrupted (control-C). Mark as an orphan + * so it will be disposed when completed. */ + sksgio->skspcl->orphaned = 1; + sksgio->skspcl = NULL; + if (rc == 0) { + pr_debug("%s:%s:%d timed out %p (%u ms)\n", + skdev->name, __func__, __LINE__, + sksgio, sksgio->sg.timeout); + rc = -ETIMEDOUT; + } else { + pr_debug("%s:%s:%d cntlc %p\n", + skdev->name, __func__, __LINE__, sksgio); + rc = -EINTR; + } + } + + spin_unlock_irqrestore(&skdev->lock, flags); + + return rc; +} + +static int skd_sg_io_put_status(struct skd_device *skdev, + struct skd_sg_io *sksgio) +{ + struct sg_io_hdr *sgp = &sksgio->sg; + struct skd_special_context *skspcl = sksgio->skspcl; + int resid = 0; + + u32 nb = be32_to_cpu(skspcl->req.completion.num_returned_bytes); + + sgp->status = skspcl->req.completion.status; + resid = sksgio->dxfer_len - nb; + + sgp->masked_status = sgp->status & STATUS_MASK; + sgp->msg_status = 0; + sgp->host_status = 0; + sgp->driver_status = 0; + sgp->resid = resid; + if (sgp->masked_status || sgp->host_status || sgp->driver_status) + sgp->info |= SG_INFO_CHECK; + + pr_debug("%s:%s:%d status %x masked %x resid 0x%x\n", + skdev->name, __func__, __LINE__, + sgp->status, sgp->masked_status, sgp->resid); + + if (sgp->masked_status == SAM_STAT_CHECK_CONDITION) { + if (sgp->mx_sb_len > 0) { + struct fit_comp_error_info *ei = &skspcl->req.err_info; + u32 nbytes = sizeof(*ei); + + nbytes = min_t(u32, nbytes, sgp->mx_sb_len); + + sgp->sb_len_wr = nbytes; + + if (__copy_to_user(sgp->sbp, ei, nbytes)) { + pr_debug("%s:%s:%d copy_to_user sense failed %p\n", + skdev->name, __func__, __LINE__, + sgp->sbp); + return -EFAULT; + } + } + } + + if (__copy_to_user(sksgio->argp, sgp, sizeof(sg_io_hdr_t))) { + pr_debug("%s:%s:%d copy_to_user sg failed %p\n", + skdev->name, __func__, __LINE__, sksgio->argp); + return -EFAULT; + } + + return 0; +} + +static int skd_sg_io_release_skspcl(struct skd_device *skdev, + struct skd_sg_io *sksgio) +{ + struct skd_special_context *skspcl = sksgio->skspcl; + + if (skspcl != NULL) { + ulong flags; + + sksgio->skspcl = NULL; + + spin_lock_irqsave(&skdev->lock, flags); + skd_release_special(skdev, skspcl); + spin_unlock_irqrestore(&skdev->lock, flags); + } + + return 0; +} + +/* + ***************************************************************************** + * INTERNAL REQUESTS -- generated by driver itself + ***************************************************************************** + */ + +static int skd_format_internal_skspcl(struct skd_device *skdev) +{ + struct skd_special_context *skspcl = &skdev->internal_skspcl; + struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0]; + struct fit_msg_hdr *fmh; + uint64_t dma_address; + struct skd_scsi_request *scsi; + + fmh = (struct fit_msg_hdr *)&skspcl->msg_buf[0]; + fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT; + fmh->num_protocol_cmds_coalesced = 1; + + scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64]; + memset(scsi, 0, sizeof(*scsi)); + dma_address = skspcl->req.sksg_dma_address; + scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address); + sgd->control = FIT_SGD_CONTROL_LAST; + sgd->byte_count = 0; + sgd->host_side_addr = skspcl->db_dma_address; + sgd->dev_side_addr = 0; + sgd->next_desc_ptr = 0LL; + + return 1; +} + +#define WR_BUF_SIZE SKD_N_INTERNAL_BYTES + +static void skd_send_internal_skspcl(struct skd_device *skdev, + struct skd_special_context *skspcl, + u8 opcode) +{ + struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0]; + struct skd_scsi_request *scsi; + unsigned char *buf = skspcl->data_buf; + int i; + + if (skspcl->req.state != SKD_REQ_STATE_IDLE) + /* + * A refresh is already in progress. + * Just wait for it to finish. + */ + return; + + SKD_ASSERT((skspcl->req.id & SKD_ID_INCR) == 0); + skspcl->req.state = SKD_REQ_STATE_BUSY; + skspcl->req.id += SKD_ID_INCR; + + scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64]; + scsi->hdr.tag = skspcl->req.id; + + memset(scsi->cdb, 0, sizeof(scsi->cdb)); + + switch (opcode) { + case TEST_UNIT_READY: + scsi->cdb[0] = TEST_UNIT_READY; + sgd->byte_count = 0; + scsi->hdr.sg_list_len_bytes = 0; + break; + + case READ_CAPACITY: + scsi->cdb[0] = READ_CAPACITY; + sgd->byte_count = SKD_N_READ_CAP_BYTES; + scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count); + break; + + case INQUIRY: + scsi->cdb[0] = INQUIRY; + scsi->cdb[1] = 0x01; /* evpd */ + scsi->cdb[2] = 0x80; /* serial number page */ + scsi->cdb[4] = 0x10; + sgd->byte_count = 16; + scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count); + break; + + case SYNCHRONIZE_CACHE: + scsi->cdb[0] = SYNCHRONIZE_CACHE; + sgd->byte_count = 0; + scsi->hdr.sg_list_len_bytes = 0; + break; + + case WRITE_BUFFER: + scsi->cdb[0] = WRITE_BUFFER; + scsi->cdb[1] = 0x02; + scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8; + scsi->cdb[8] = WR_BUF_SIZE & 0xFF; + sgd->byte_count = WR_BUF_SIZE; + scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count); + /* fill incrementing byte pattern */ + for (i = 0; i < sgd->byte_count; i++) + buf[i] = i & 0xFF; + break; + + case READ_BUFFER: + scsi->cdb[0] = READ_BUFFER; + scsi->cdb[1] = 0x02; + scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8; + scsi->cdb[8] = WR_BUF_SIZE & 0xFF; + sgd->byte_count = WR_BUF_SIZE; + scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count); + memset(skspcl->data_buf, 0, sgd->byte_count); + break; + + default: + SKD_ASSERT("Don't know what to send"); + return; + + } + skd_send_special_fitmsg(skdev, skspcl); +} + +static void skd_refresh_device_data(struct skd_device *skdev) +{ + struct skd_special_context *skspcl = &skdev->internal_skspcl; + + skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY); +} + +static int skd_chk_read_buf(struct skd_device *skdev, + struct skd_special_context *skspcl) +{ + unsigned char *buf = skspcl->data_buf; + int i; + + /* check for incrementing byte pattern */ + for (i = 0; i < WR_BUF_SIZE; i++) + if (buf[i] != (i & 0xFF)) + return 1; + + return 0; +} + +static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key, + u8 code, u8 qual, u8 fruc) +{ + /* If the check condition is of special interest, log a message */ + if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02) + && (code == 0x04) && (qual == 0x06)) { + pr_err("(%s): *** LOST_WRITE_DATA ERROR *** key/asc/" + "ascq/fruc %02x/%02x/%02x/%02x\n", + skd_name(skdev), key, code, qual, fruc); + } +} + +static void skd_complete_internal(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 + *skcomp, + volatile struct fit_comp_error_info *skerr, + struct skd_special_context *skspcl) +{ + u8 *buf = skspcl->data_buf; + u8 status; + int i; + struct skd_scsi_request *scsi = + (struct skd_scsi_request *)&skspcl->msg_buf[64]; + + SKD_ASSERT(skspcl == &skdev->internal_skspcl); + + pr_debug("%s:%s:%d complete internal %x\n", + skdev->name, __func__, __LINE__, scsi->cdb[0]); + + skspcl->req.completion = *skcomp; + skspcl->req.state = SKD_REQ_STATE_IDLE; + skspcl->req.id += SKD_ID_INCR; + + status = skspcl->req.completion.status; + + skd_log_check_status(skdev, status, skerr->key, skerr->code, + skerr->qual, skerr->fruc); + + switch (scsi->cdb[0]) { + case TEST_UNIT_READY: + if (status == SAM_STAT_GOOD) + skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER); + else if ((status == SAM_STAT_CHECK_CONDITION) && + (skerr->key == MEDIUM_ERROR)) + skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER); + else { + if (skdev->state == SKD_DRVR_STATE_STOPPING) { + pr_debug("%s:%s:%d TUR failed, don't send anymore state 0x%x\n", + skdev->name, __func__, __LINE__, + skdev->state); + return; + } + pr_debug("%s:%s:%d **** TUR failed, retry skerr\n", + skdev->name, __func__, __LINE__); + skd_send_internal_skspcl(skdev, skspcl, 0x00); + } + break; + + case WRITE_BUFFER: + if (status == SAM_STAT_GOOD) + skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER); + else { + if (skdev->state == SKD_DRVR_STATE_STOPPING) { + pr_debug("%s:%s:%d write buffer failed, don't send anymore state 0x%x\n", + skdev->name, __func__, __LINE__, + skdev->state); + return; + } + pr_debug("%s:%s:%d **** write buffer failed, retry skerr\n", + skdev->name, __func__, __LINE__); + skd_send_internal_skspcl(skdev, skspcl, 0x00); + } + break; + + case READ_BUFFER: + if (status == SAM_STAT_GOOD) { + if (skd_chk_read_buf(skdev, skspcl) == 0) + skd_send_internal_skspcl(skdev, skspcl, + READ_CAPACITY); + else { + pr_err( + "(%s):*** W/R Buffer mismatch %d ***\n", + skd_name(skdev), skdev->connect_retries); + if (skdev->connect_retries < + SKD_MAX_CONNECT_RETRIES) { + skdev->connect_retries++; + skd_soft_reset(skdev); + } else { + pr_err( + "(%s): W/R Buffer Connect Error\n", + skd_name(skdev)); + return; + } + } + + } else { + if (skdev->state == SKD_DRVR_STATE_STOPPING) { + pr_debug("%s:%s:%d " + "read buffer failed, don't send anymore state 0x%x\n", + skdev->name, __func__, __LINE__, + skdev->state); + return; + } + pr_debug("%s:%s:%d " + "**** read buffer failed, retry skerr\n", + skdev->name, __func__, __LINE__); + skd_send_internal_skspcl(skdev, skspcl, 0x00); + } + break; + + case READ_CAPACITY: + skdev->read_cap_is_valid = 0; + if (status == SAM_STAT_GOOD) { + skdev->read_cap_last_lba = + (buf[0] << 24) | (buf[1] << 16) | + (buf[2] << 8) | buf[3]; + skdev->read_cap_blocksize = + (buf[4] << 24) | (buf[5] << 16) | + (buf[6] << 8) | buf[7]; + + pr_debug("%s:%s:%d last lba %d, bs %d\n", + skdev->name, __func__, __LINE__, + skdev->read_cap_last_lba, + skdev->read_cap_blocksize); + + set_capacity(skdev->disk, skdev->read_cap_last_lba + 1); + + skdev->read_cap_is_valid = 1; + + skd_send_internal_skspcl(skdev, skspcl, INQUIRY); + } else if ((status == SAM_STAT_CHECK_CONDITION) && + (skerr->key == MEDIUM_ERROR)) { + skdev->read_cap_last_lba = ~0; + set_capacity(skdev->disk, skdev->read_cap_last_lba + 1); + pr_debug("%s:%s:%d " + "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n", + skdev->name, __func__, __LINE__); + skd_send_internal_skspcl(skdev, skspcl, INQUIRY); + } else { + pr_debug("%s:%s:%d **** READCAP failed, retry TUR\n", + skdev->name, __func__, __LINE__); + skd_send_internal_skspcl(skdev, skspcl, + TEST_UNIT_READY); + } + break; + + case INQUIRY: + skdev->inquiry_is_valid = 0; + if (status == SAM_STAT_GOOD) { + skdev->inquiry_is_valid = 1; + + for (i = 0; i < 12; i++) + skdev->inq_serial_num[i] = buf[i + 4]; + skdev->inq_serial_num[12] = 0; + } + + if (skd_unquiesce_dev(skdev) < 0) + pr_debug("%s:%s:%d **** failed, to ONLINE device\n", + skdev->name, __func__, __LINE__); + /* connection is complete */ + skdev->connect_retries = 0; + break; + + case SYNCHRONIZE_CACHE: + if (status == SAM_STAT_GOOD) + skdev->sync_done = 1; + else + skdev->sync_done = -1; + wake_up_interruptible(&skdev->waitq); + break; + + default: + SKD_ASSERT("we didn't send this"); + } +} + +/* + ***************************************************************************** + * FIT MESSAGES + ***************************************************************************** + */ + +static void skd_send_fitmsg(struct skd_device *skdev, + struct skd_fitmsg_context *skmsg) +{ + u64 qcmd; + struct fit_msg_hdr *fmh; + + pr_debug("%s:%s:%d dma address 0x%llx, busy=%d\n", + skdev->name, __func__, __LINE__, + skmsg->mb_dma_address, skdev->in_flight); + pr_debug("%s:%s:%d msg_buf 0x%p, offset %x\n", + skdev->name, __func__, __LINE__, + skmsg->msg_buf, skmsg->offset); + + qcmd = skmsg->mb_dma_address; + qcmd |= FIT_QCMD_QID_NORMAL; + + fmh = (struct fit_msg_hdr *)skmsg->msg_buf; + skmsg->outstanding = fmh->num_protocol_cmds_coalesced; + + if (unlikely(skdev->dbg_level > 1)) { + u8 *bp = (u8 *)skmsg->msg_buf; + int i; + for (i = 0; i < skmsg->length; i += 8) { + pr_debug("%s:%s:%d msg[%2d] %02x %02x %02x %02x " + "%02x %02x %02x %02x\n", + skdev->name, __func__, __LINE__, + i, bp[i + 0], bp[i + 1], bp[i + 2], + bp[i + 3], bp[i + 4], bp[i + 5], + bp[i + 6], bp[i + 7]); + if (i == 0) + i = 64 - 8; + } + } + + if (skmsg->length > 256) + qcmd |= FIT_QCMD_MSGSIZE_512; + else if (skmsg->length > 128) + qcmd |= FIT_QCMD_MSGSIZE_256; + else if (skmsg->length > 64) + qcmd |= FIT_QCMD_MSGSIZE_128; + else + /* + * This makes no sense because the FIT msg header is + * 64 bytes. If the msg is only 64 bytes long it has + * no payload. + */ + qcmd |= FIT_QCMD_MSGSIZE_64; + + SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND); + +} + +static void skd_send_special_fitmsg(struct skd_device *skdev, + struct skd_special_context *skspcl) +{ + u64 qcmd; + + if (unlikely(skdev->dbg_level > 1)) { + u8 *bp = (u8 *)skspcl->msg_buf; + int i; + + for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) { + pr_debug("%s:%s:%d spcl[%2d] %02x %02x %02x %02x " + "%02x %02x %02x %02x\n", + skdev->name, __func__, __LINE__, i, + bp[i + 0], bp[i + 1], bp[i + 2], bp[i + 3], + bp[i + 4], bp[i + 5], bp[i + 6], bp[i + 7]); + if (i == 0) + i = 64 - 8; + } + + pr_debug("%s:%s:%d skspcl=%p id=%04x sksg_list=%p sksg_dma=%llx\n", + skdev->name, __func__, __LINE__, + skspcl, skspcl->req.id, skspcl->req.sksg_list, + skspcl->req.sksg_dma_address); + for (i = 0; i < skspcl->req.n_sg; i++) { + struct fit_sg_descriptor *sgd = + &skspcl->req.sksg_list[i]; + + pr_debug("%s:%s:%d sg[%d] count=%u ctrl=0x%x " + "addr=0x%llx next=0x%llx\n", + skdev->name, __func__, __LINE__, + i, sgd->byte_count, sgd->control, + sgd->host_side_addr, sgd->next_desc_ptr); + } + } + + /* + * Special FIT msgs are always 128 bytes: a 64-byte FIT hdr + * and one 64-byte SSDI command. + */ + qcmd = skspcl->mb_dma_address; + qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128; + + SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND); +} + +/* + ***************************************************************************** + * COMPLETION QUEUE + ***************************************************************************** + */ + +static void skd_complete_other(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 *skcomp, + volatile struct fit_comp_error_info *skerr); + +struct sns_info { + u8 type; + u8 stat; + u8 key; + u8 asc; + u8 ascq; + u8 mask; + enum skd_check_status_action action; +}; + +static struct sns_info skd_chkstat_table[] = { + /* Good */ + { 0x70, 0x02, RECOVERED_ERROR, 0, 0, 0x1c, + SKD_CHECK_STATUS_REPORT_GOOD }, + + /* Smart alerts */ + { 0x70, 0x02, NO_SENSE, 0x0B, 0x00, 0x1E, /* warnings */ + SKD_CHECK_STATUS_REPORT_SMART_ALERT }, + { 0x70, 0x02, NO_SENSE, 0x5D, 0x00, 0x1E, /* thresholds */ + SKD_CHECK_STATUS_REPORT_SMART_ALERT }, + { 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F, /* temperature over trigger */ + SKD_CHECK_STATUS_REPORT_SMART_ALERT }, + + /* Retry (with limits) */ + { 0x70, 0x02, 0x0B, 0, 0, 0x1C, /* This one is for DMA ERROR */ + SKD_CHECK_STATUS_REQUEUE_REQUEST }, + { 0x70, 0x02, 0x06, 0x0B, 0x00, 0x1E, /* warnings */ + SKD_CHECK_STATUS_REQUEUE_REQUEST }, + { 0x70, 0x02, 0x06, 0x5D, 0x00, 0x1E, /* thresholds */ + SKD_CHECK_STATUS_REQUEUE_REQUEST }, + { 0x70, 0x02, 0x06, 0x80, 0x30, 0x1F, /* backup power */ + SKD_CHECK_STATUS_REQUEUE_REQUEST }, + + /* Busy (or about to be) */ + { 0x70, 0x02, 0x06, 0x3f, 0x01, 0x1F, /* fw changed */ + SKD_CHECK_STATUS_BUSY_IMMINENT }, +}; + +/* + * Look up status and sense data to decide how to handle the error + * from the device. + * mask says which fields must match e.g., mask=0x18 means check + * type and stat, ignore key, asc, ascq. + */ + +static enum skd_check_status_action +skd_check_status(struct skd_device *skdev, + u8 cmp_status, volatile struct fit_comp_error_info *skerr) +{ + int i, n; + + pr_err("(%s): key/asc/ascq/fruc %02x/%02x/%02x/%02x\n", + skd_name(skdev), skerr->key, skerr->code, skerr->qual, + skerr->fruc); + + pr_debug("%s:%s:%d stat: t=%02x stat=%02x k=%02x c=%02x q=%02x fruc=%02x\n", + skdev->name, __func__, __LINE__, skerr->type, cmp_status, + skerr->key, skerr->code, skerr->qual, skerr->fruc); + + /* Does the info match an entry in the good category? */ + n = sizeof(skd_chkstat_table) / sizeof(skd_chkstat_table[0]); + for (i = 0; i < n; i++) { + struct sns_info *sns = &skd_chkstat_table[i]; + + if (sns->mask & 0x10) + if (skerr->type != sns->type) + continue; + + if (sns->mask & 0x08) + if (cmp_status != sns->stat) + continue; + + if (sns->mask & 0x04) + if (skerr->key != sns->key) + continue; + + if (sns->mask & 0x02) + if (skerr->code != sns->asc) + continue; + + if (sns->mask & 0x01) + if (skerr->qual != sns->ascq) + continue; + + if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) { + pr_err("(%s): SMART Alert: sense key/asc/ascq " + "%02x/%02x/%02x\n", + skd_name(skdev), skerr->key, + skerr->code, skerr->qual); + } + return sns->action; + } + + /* No other match, so nonzero status means error, + * zero status means good + */ + if (cmp_status) { + pr_debug("%s:%s:%d status check: error\n", + skdev->name, __func__, __LINE__); + return SKD_CHECK_STATUS_REPORT_ERROR; + } + + pr_debug("%s:%s:%d status check good default\n", + skdev->name, __func__, __LINE__); + return SKD_CHECK_STATUS_REPORT_GOOD; +} + +static void skd_resolve_req_exception(struct skd_device *skdev, + struct skd_request_context *skreq) +{ + u8 cmp_status = skreq->completion.status; + + switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) { + case SKD_CHECK_STATUS_REPORT_GOOD: + case SKD_CHECK_STATUS_REPORT_SMART_ALERT: + skd_end_request(skdev, skreq, 0); + break; + + case SKD_CHECK_STATUS_BUSY_IMMINENT: + skd_log_skreq(skdev, skreq, "retry(busy)"); + blk_requeue_request(skdev->queue, skreq->req); + pr_info("(%s) drive BUSY imminent\n", skd_name(skdev)); + skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT; + skdev->timer_countdown = SKD_TIMER_MINUTES(20); + skd_quiesce_dev(skdev); + break; + + case SKD_CHECK_STATUS_REQUEUE_REQUEST: + if ((unsigned long) ++skreq->req->special < SKD_MAX_RETRIES) { + skd_log_skreq(skdev, skreq, "retry"); + blk_requeue_request(skdev->queue, skreq->req); + break; + } + /* fall through to report error */ + + case SKD_CHECK_STATUS_REPORT_ERROR: + default: + skd_end_request(skdev, skreq, -EIO); + break; + } +} + +/* assume spinlock is already held */ +static void skd_release_skreq(struct skd_device *skdev, + struct skd_request_context *skreq) +{ + u32 msg_slot; + struct skd_fitmsg_context *skmsg; + + u32 timo_slot; + + /* + * Reclaim the FIT msg buffer if this is + * the first of the requests it carried to + * be completed. The FIT msg buffer used to + * send this request cannot be reused until + * we are sure the s1120 card has copied + * it to its memory. The FIT msg might have + * contained several requests. As soon as + * any of them are completed we know that + * the entire FIT msg was transferred. + * Only the first completed request will + * match the FIT msg buffer id. The FIT + * msg buffer id is immediately updated. + * When subsequent requests complete the FIT + * msg buffer id won't match, so we know + * quite cheaply that it is already done. + */ + msg_slot = skreq->fitmsg_id & SKD_ID_SLOT_MASK; + SKD_ASSERT(msg_slot < skdev->num_fitmsg_context); + + skmsg = &skdev->skmsg_table[msg_slot]; + if (skmsg->id == skreq->fitmsg_id) { + SKD_ASSERT(skmsg->state == SKD_MSG_STATE_BUSY); + SKD_ASSERT(skmsg->outstanding > 0); + skmsg->outstanding--; + if (skmsg->outstanding == 0) { + skmsg->state = SKD_MSG_STATE_IDLE; + skmsg->id += SKD_ID_INCR; + skmsg->next = skdev->skmsg_free_list; + skdev->skmsg_free_list = skmsg; + } + } + + /* + * Decrease the number of active requests. + * Also decrements the count in the timeout slot. + */ + SKD_ASSERT(skdev->in_flight > 0); + skdev->in_flight -= 1; + + timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK; + SKD_ASSERT(skdev->timeout_slot[timo_slot] > 0); + skdev->timeout_slot[timo_slot] -= 1; + + /* + * Reset backpointer + */ + skreq->req = NULL; + + /* + * Reclaim the skd_request_context + */ + skreq->state = SKD_REQ_STATE_IDLE; + skreq->id += SKD_ID_INCR; + skreq->next = skdev->skreq_free_list; + skdev->skreq_free_list = skreq; +} + +#define DRIVER_INQ_EVPD_PAGE_CODE 0xDA + +static void skd_do_inq_page_00(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 *skcomp, + volatile struct fit_comp_error_info *skerr, + uint8_t *cdb, uint8_t *buf) +{ + uint16_t insert_pt, max_bytes, drive_pages, drive_bytes, new_size; + + /* Caller requested "supported pages". The driver needs to insert + * its page. + */ + pr_debug("%s:%s:%d skd_do_driver_inquiry: modify supported pages.\n", + skdev->name, __func__, __LINE__); + + /* If the device rejected the request because the CDB was + * improperly formed, then just leave. + */ + if (skcomp->status == SAM_STAT_CHECK_CONDITION && + skerr->key == ILLEGAL_REQUEST && skerr->code == 0x24) + return; + + /* Get the amount of space the caller allocated */ + max_bytes = (cdb[3] << 8) | cdb[4]; + + /* Get the number of pages actually returned by the device */ + drive_pages = (buf[2] << 8) | buf[3]; + drive_bytes = drive_pages + 4; + new_size = drive_pages + 1; + + /* Supported pages must be in numerical order, so find where + * the driver page needs to be inserted into the list of + * pages returned by the device. + */ + for (insert_pt = 4; insert_pt < drive_bytes; insert_pt++) { + if (buf[insert_pt] == DRIVER_INQ_EVPD_PAGE_CODE) + return; /* Device using this page code. abort */ + else if (buf[insert_pt] > DRIVER_INQ_EVPD_PAGE_CODE) + break; + } + + if (insert_pt < max_bytes) { + uint16_t u; + + /* Shift everything up one byte to make room. */ + for (u = new_size + 3; u > insert_pt; u--) + buf[u] = buf[u - 1]; + buf[insert_pt] = DRIVER_INQ_EVPD_PAGE_CODE; + + /* SCSI byte order increment of num_returned_bytes by 1 */ + skcomp->num_returned_bytes = + be32_to_cpu(skcomp->num_returned_bytes) + 1; + skcomp->num_returned_bytes = + be32_to_cpu(skcomp->num_returned_bytes); + } + + /* update page length field to reflect the driver's page too */ + buf[2] = (uint8_t)((new_size >> 8) & 0xFF); + buf[3] = (uint8_t)((new_size >> 0) & 0xFF); +} + +static void skd_get_link_info(struct pci_dev *pdev, u8 *speed, u8 *width) +{ + int pcie_reg; + u16 pci_bus_speed; + u8 pci_lanes; + + pcie_reg = pci_find_capability(pdev, PCI_CAP_ID_EXP); + if (pcie_reg) { + u16 linksta; + pci_read_config_word(pdev, pcie_reg + PCI_EXP_LNKSTA, &linksta); + + pci_bus_speed = linksta & 0xF; + pci_lanes = (linksta & 0x3F0) >> 4; + } else { + *speed = STEC_LINK_UNKNOWN; + *width = 0xFF; + return; + } + + switch (pci_bus_speed) { + case 1: + *speed = STEC_LINK_2_5GTS; + break; + case 2: + *speed = STEC_LINK_5GTS; + break; + case 3: + *speed = STEC_LINK_8GTS; + break; + default: + *speed = STEC_LINK_UNKNOWN; + break; + } + + if (pci_lanes <= 0x20) + *width = pci_lanes; + else + *width = 0xFF; +} + +static void skd_do_inq_page_da(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 *skcomp, + volatile struct fit_comp_error_info *skerr, + uint8_t *cdb, uint8_t *buf) +{ + struct pci_dev *pdev = skdev->pdev; + unsigned max_bytes; + struct driver_inquiry_data inq; + u16 val; + + pr_debug("%s:%s:%d skd_do_driver_inquiry: return driver page\n", + skdev->name, __func__, __LINE__); + + memset(&inq, 0, sizeof(inq)); + + inq.page_code = DRIVER_INQ_EVPD_PAGE_CODE; + + skd_get_link_info(pdev, &inq.pcie_link_speed, &inq.pcie_link_lanes); + inq.pcie_bus_number = cpu_to_be16(pdev->bus->number); + inq.pcie_device_number = PCI_SLOT(pdev->devfn); + inq.pcie_function_number = PCI_FUNC(pdev->devfn); + + pci_read_config_word(pdev, PCI_VENDOR_ID, &val); + inq.pcie_vendor_id = cpu_to_be16(val); + + pci_read_config_word(pdev, PCI_DEVICE_ID, &val); + inq.pcie_device_id = cpu_to_be16(val); + + pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &val); + inq.pcie_subsystem_vendor_id = cpu_to_be16(val); + + pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &val); + inq.pcie_subsystem_device_id = cpu_to_be16(val); + + /* Driver version, fixed lenth, padded with spaces on the right */ + inq.driver_version_length = sizeof(inq.driver_version); + memset(&inq.driver_version, ' ', sizeof(inq.driver_version)); + memcpy(inq.driver_version, DRV_VER_COMPL, + min(sizeof(inq.driver_version), strlen(DRV_VER_COMPL))); + + inq.page_length = cpu_to_be16((sizeof(inq) - 4)); + + /* Clear the error set by the device */ + skcomp->status = SAM_STAT_GOOD; + memset((void *)skerr, 0, sizeof(*skerr)); + + /* copy response into output buffer */ + max_bytes = (cdb[3] << 8) | cdb[4]; + memcpy(buf, &inq, min_t(unsigned, max_bytes, sizeof(inq))); + + skcomp->num_returned_bytes = + be32_to_cpu(min_t(uint16_t, max_bytes, sizeof(inq))); +} + +static void skd_do_driver_inq(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 *skcomp, + volatile struct fit_comp_error_info *skerr, + uint8_t *cdb, uint8_t *buf) +{ + if (!buf) + return; + else if (cdb[0] != INQUIRY) + return; /* Not an INQUIRY */ + else if ((cdb[1] & 1) == 0) + return; /* EVPD not set */ + else if (cdb[2] == 0) + /* Need to add driver's page to supported pages list */ + skd_do_inq_page_00(skdev, skcomp, skerr, cdb, buf); + else if (cdb[2] == DRIVER_INQ_EVPD_PAGE_CODE) + /* Caller requested driver's page */ + skd_do_inq_page_da(skdev, skcomp, skerr, cdb, buf); +} + +static unsigned char *skd_sg_1st_page_ptr(struct scatterlist *sg) +{ + if (!sg) + return NULL; + if (!sg_page(sg)) + return NULL; + return sg_virt(sg); +} + +static void skd_process_scsi_inq(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 + *skcomp, + volatile struct fit_comp_error_info *skerr, + struct skd_special_context *skspcl) +{ + uint8_t *buf; + struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf; + struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1]; + + dma_sync_sg_for_cpu(skdev->class_dev, skspcl->req.sg, skspcl->req.n_sg, + skspcl->req.sg_data_dir); + buf = skd_sg_1st_page_ptr(skspcl->req.sg); + + if (buf) + skd_do_driver_inq(skdev, skcomp, skerr, scsi_req->cdb, buf); +} + + +static int skd_isr_completion_posted(struct skd_device *skdev, + int limit, int *enqueued) +{ + volatile struct fit_completion_entry_v1 *skcmp = NULL; + volatile struct fit_comp_error_info *skerr; + u16 req_id; + u32 req_slot; + struct skd_request_context *skreq; + u16 cmp_cntxt = 0; + u8 cmp_status = 0; + u8 cmp_cycle = 0; + u32 cmp_bytes = 0; + int rc = 0; + int processed = 0; + + for (;; ) { + SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY); + + skcmp = &skdev->skcomp_table[skdev->skcomp_ix]; + cmp_cycle = skcmp->cycle; + cmp_cntxt = skcmp->tag; + cmp_status = skcmp->status; + cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes); + + skerr = &skdev->skerr_table[skdev->skcomp_ix]; + + pr_debug("%s:%s:%d " + "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d " + "busy=%d rbytes=0x%x proto=%d\n", + skdev->name, __func__, __LINE__, skdev->skcomp_cycle, + skdev->skcomp_ix, cmp_cycle, cmp_cntxt, cmp_status, + skdev->in_flight, cmp_bytes, skdev->proto_ver); + + if (cmp_cycle != skdev->skcomp_cycle) { + pr_debug("%s:%s:%d end of completions\n", + skdev->name, __func__, __LINE__); + break; + } + /* + * Update the completion queue head index and possibly + * the completion cycle count. 8-bit wrap-around. + */ + skdev->skcomp_ix++; + if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) { + skdev->skcomp_ix = 0; + skdev->skcomp_cycle++; + } + + /* + * The command context is a unique 32-bit ID. The low order + * bits help locate the request. The request is usually a + * r/w request (see skd_start() above) or a special request. + */ + req_id = cmp_cntxt; + req_slot = req_id & SKD_ID_SLOT_AND_TABLE_MASK; + + /* Is this other than a r/w request? */ + if (req_slot >= skdev->num_req_context) { + /* + * This is not a completion for a r/w request. + */ + skd_complete_other(skdev, skcmp, skerr); + continue; + } + + skreq = &skdev->skreq_table[req_slot]; + + /* + * Make sure the request ID for the slot matches. + */ + if (skreq->id != req_id) { + pr_debug("%s:%s:%d mismatch comp_id=0x%x req_id=0x%x\n", + skdev->name, __func__, __LINE__, + req_id, skreq->id); + { + u16 new_id = cmp_cntxt; + pr_err("(%s): Completion mismatch " + "comp_id=0x%04x skreq=0x%04x new=0x%04x\n", + skd_name(skdev), req_id, + skreq->id, new_id); + + continue; + } + } + + SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY); + + if (skreq->state == SKD_REQ_STATE_ABORTED) { + pr_debug("%s:%s:%d reclaim req %p id=%04x\n", + skdev->name, __func__, __LINE__, + skreq, skreq->id); + /* a previously timed out command can + * now be cleaned up */ + skd_release_skreq(skdev, skreq); + continue; + } + + skreq->completion = *skcmp; + if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) { + skreq->err_info = *skerr; + skd_log_check_status(skdev, cmp_status, skerr->key, + skerr->code, skerr->qual, + skerr->fruc); + } + /* Release DMA resources for the request. */ + if (skreq->n_sg > 0) + skd_postop_sg_list(skdev, skreq); + + if (!skreq->req) { + pr_debug("%s:%s:%d NULL backptr skdreq %p, " + "req=0x%x req_id=0x%x\n", + skdev->name, __func__, __LINE__, + skreq, skreq->id, req_id); + } else { + /* + * Capture the outcome and post it back to the + * native request. + */ + if (likely(cmp_status == SAM_STAT_GOOD)) + skd_end_request(skdev, skreq, 0); + else + skd_resolve_req_exception(skdev, skreq); + } + + /* + * Release the skreq, its FIT msg (if one), timeout slot, + * and queue depth. + */ + skd_release_skreq(skdev, skreq); + + /* skd_isr_comp_limit equal zero means no limit */ + if (limit) { + if (++processed >= limit) { + rc = 1; + break; + } + } + } + + if ((skdev->state == SKD_DRVR_STATE_PAUSING) + && (skdev->in_flight) == 0) { + skdev->state = SKD_DRVR_STATE_PAUSED; + wake_up_interruptible(&skdev->waitq); + } + + return rc; +} + +static void skd_complete_other(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 *skcomp, + volatile struct fit_comp_error_info *skerr) +{ + u32 req_id = 0; + u32 req_table; + u32 req_slot; + struct skd_special_context *skspcl; + + req_id = skcomp->tag; + req_table = req_id & SKD_ID_TABLE_MASK; + req_slot = req_id & SKD_ID_SLOT_MASK; + + pr_debug("%s:%s:%d table=0x%x id=0x%x slot=%d\n", + skdev->name, __func__, __LINE__, + req_table, req_id, req_slot); + + /* + * Based on the request id, determine how to dispatch this completion. + * This swich/case is finding the good cases and forwarding the + * completion entry. Errors are reported below the switch. + */ + switch (req_table) { + case SKD_ID_RW_REQUEST: + /* + * The caller, skd_completion_posted_isr() above, + * handles r/w requests. The only way we get here + * is if the req_slot is out of bounds. + */ + break; + + case SKD_ID_SPECIAL_REQUEST: + /* + * Make sure the req_slot is in bounds and that the id + * matches. + */ + if (req_slot < skdev->n_special) { + skspcl = &skdev->skspcl_table[req_slot]; + if (skspcl->req.id == req_id && + skspcl->req.state == SKD_REQ_STATE_BUSY) { + skd_complete_special(skdev, + skcomp, skerr, skspcl); + return; + } + } + break; + + case SKD_ID_INTERNAL: + if (req_slot == 0) { + skspcl = &skdev->internal_skspcl; + if (skspcl->req.id == req_id && + skspcl->req.state == SKD_REQ_STATE_BUSY) { + skd_complete_internal(skdev, + skcomp, skerr, skspcl); + return; + } + } + break; + + case SKD_ID_FIT_MSG: + /* + * These id's should never appear in a completion record. + */ + break; + + default: + /* + * These id's should never appear anywhere; + */ + break; + } + + /* + * If we get here it is a bad or stale id. + */ +} + +static void skd_complete_special(struct skd_device *skdev, + volatile struct fit_completion_entry_v1 + *skcomp, + volatile struct fit_comp_error_info *skerr, + struct skd_special_context *skspcl) +{ + pr_debug("%s:%s:%d completing special request %p\n", + skdev->name, __func__, __LINE__, skspcl); + if (skspcl->orphaned) { + /* Discard orphaned request */ + /* ?: Can this release directly or does it need + * to use a worker? */ + pr_debug("%s:%s:%d release orphaned %p\n", + skdev->name, __func__, __LINE__, skspcl); + skd_release_special(skdev, skspcl); + return; + } + + skd_process_scsi_inq(skdev, skcomp, skerr, skspcl); + + skspcl->req.state = SKD_REQ_STATE_COMPLETED; + skspcl->req.completion = *skcomp; + skspcl->req.err_info = *skerr; + + skd_log_check_status(skdev, skspcl->req.completion.status, skerr->key, + skerr->code, skerr->qual, skerr->fruc); + + wake_up_interruptible(&skdev->waitq); +} + +/* assume spinlock is already held */ +static void skd_release_special(struct skd_device *skdev, + struct skd_special_context *skspcl) +{ + int i, was_depleted; + + for (i = 0; i < skspcl->req.n_sg; i++) { + struct page *page = sg_page(&skspcl->req.sg[i]); + __free_page(page); + } + + was_depleted = (skdev->skspcl_free_list == NULL); + + skspcl->req.state = SKD_REQ_STATE_IDLE; + skspcl->req.id += SKD_ID_INCR; + skspcl->req.next = + (struct skd_request_context *)skdev->skspcl_free_list; + skdev->skspcl_free_list = (struct skd_special_context *)skspcl; + + if (was_depleted) { + pr_debug("%s:%s:%d skspcl was depleted\n", + skdev->name, __func__, __LINE__); + /* Free list was depleted. Their might be waiters. */ + wake_up_interruptible(&skdev->waitq); + } +} + +static void skd_reset_skcomp(struct skd_device *skdev) +{ + u32 nbytes; + struct fit_completion_entry_v1 *skcomp; + + nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY; + nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY; + + memset(skdev->skcomp_table, 0, nbytes); + + skdev->skcomp_ix = 0; + skdev->skcomp_cycle = 1; +} + +/* + ***************************************************************************** + * INTERRUPTS + ***************************************************************************** + */ +static void skd_completion_worker(struct work_struct *work) +{ + struct skd_device *skdev = + container_of(work, struct skd_device, completion_worker); + unsigned long flags; + int flush_enqueued = 0; + + spin_lock_irqsave(&skdev->lock, flags); + + /* + * pass in limit=0, which means no limit.. + * process everything in compq + */ + skd_isr_completion_posted(skdev, 0, &flush_enqueued); + skd_request_fn(skdev->queue); + + spin_unlock_irqrestore(&skdev->lock, flags); +} + +static void skd_isr_msg_from_dev(struct skd_device *skdev); + +irqreturn_t +static skd_isr(int irq, void *ptr) +{ + struct skd_device *skdev; + u32 intstat; + u32 ack; + int rc = 0; + int deferred = 0; + int flush_enqueued = 0; + + skdev = (struct skd_device *)ptr; + spin_lock(&skdev->lock); + + for (;; ) { + intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST); + + ack = FIT_INT_DEF_MASK; + ack &= intstat; + + pr_debug("%s:%s:%d intstat=0x%x ack=0x%x\n", + skdev->name, __func__, __LINE__, intstat, ack); + + /* As long as there is an int pending on device, keep + * running loop. When none, get out, but if we've never + * done any processing, call completion handler? + */ + if (ack == 0) { + /* No interrupts on device, but run the completion + * processor anyway? + */ + if (rc == 0) + if (likely (skdev->state + == SKD_DRVR_STATE_ONLINE)) + deferred = 1; + break; + } + + rc = IRQ_HANDLED; + + SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST); + + if (likely((skdev->state != SKD_DRVR_STATE_LOAD) && + (skdev->state != SKD_DRVR_STATE_STOPPING))) { + if (intstat & FIT_ISH_COMPLETION_POSTED) { + /* + * If we have already deferred completion + * processing, don't bother running it again + */ + if (deferred == 0) + deferred = + skd_isr_completion_posted(skdev, + skd_isr_comp_limit, &flush_enqueued); + } + + if (intstat & FIT_ISH_FW_STATE_CHANGE) { + skd_isr_fwstate(skdev); + if (skdev->state == SKD_DRVR_STATE_FAULT || + skdev->state == + SKD_DRVR_STATE_DISAPPEARED) { + spin_unlock(&skdev->lock); + return rc; + } + } + + if (intstat & FIT_ISH_MSG_FROM_DEV) + skd_isr_msg_from_dev(skdev); + } + } + + if (unlikely(flush_enqueued)) + skd_request_fn(skdev->queue); + + if (deferred) + schedule_work(&skdev->completion_worker); + else if (!flush_enqueued) + skd_request_fn(skdev->queue); + + spin_unlock(&skdev->lock); + + return rc; +} + +static void skd_drive_fault(struct skd_device *skdev) +{ + skdev->state = SKD_DRVR_STATE_FAULT; + pr_err("(%s): Drive FAULT\n", skd_name(skdev)); +} + +static void skd_drive_disappeared(struct skd_device *skdev) +{ + skdev->state = SKD_DRVR_STATE_DISAPPEARED; + pr_err("(%s): Drive DISAPPEARED\n", skd_name(skdev)); +} + +static void skd_isr_fwstate(struct skd_device *skdev) +{ + u32 sense; + u32 state; + u32 mtd; + int prev_driver_state = skdev->state; + + sense = SKD_READL(skdev, FIT_STATUS); + state = sense & FIT_SR_DRIVE_STATE_MASK; + + pr_err("(%s): s1120 state %s(%d)=>%s(%d)\n", + skd_name(skdev), + skd_drive_state_to_str(skdev->drive_state), skdev->drive_state, + skd_drive_state_to_str(state), state); + + skdev->drive_state = state; + + switch (skdev->drive_state) { + case FIT_SR_DRIVE_INIT: + if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) { + skd_disable_interrupts(skdev); + break; + } + if (skdev->state == SKD_DRVR_STATE_RESTARTING) + skd_recover_requests(skdev, 0); + if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) { + skdev->timer_countdown = SKD_STARTING_TIMO; + skdev->state = SKD_DRVR_STATE_STARTING; + skd_soft_reset(skdev); + break; + } + mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_SR_DRIVE_ONLINE: + skdev->cur_max_queue_depth = skd_max_queue_depth; + if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth) + skdev->cur_max_queue_depth = skdev->dev_max_queue_depth; + + skdev->queue_low_water_mark = + skdev->cur_max_queue_depth * 2 / 3 + 1; + if (skdev->queue_low_water_mark < 1) + skdev->queue_low_water_mark = 1; + pr_info( + "(%s): Queue depth limit=%d dev=%d lowat=%d\n", + skd_name(skdev), + skdev->cur_max_queue_depth, + skdev->dev_max_queue_depth, skdev->queue_low_water_mark); + + skd_refresh_device_data(skdev); + break; + + case FIT_SR_DRIVE_BUSY: + skdev->state = SKD_DRVR_STATE_BUSY; + skdev->timer_countdown = SKD_BUSY_TIMO; + skd_quiesce_dev(skdev); + break; + case FIT_SR_DRIVE_BUSY_SANITIZE: + /* set timer for 3 seconds, we'll abort any unfinished + * commands after that expires + */ + skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE; + skdev->timer_countdown = SKD_TIMER_SECONDS(3); + blk_start_queue(skdev->queue); + break; + case FIT_SR_DRIVE_BUSY_ERASE: + skdev->state = SKD_DRVR_STATE_BUSY_ERASE; + skdev->timer_countdown = SKD_BUSY_TIMO; + break; + case FIT_SR_DRIVE_OFFLINE: + skdev->state = SKD_DRVR_STATE_IDLE; + break; + case FIT_SR_DRIVE_SOFT_RESET: + switch (skdev->state) { + case SKD_DRVR_STATE_STARTING: + case SKD_DRVR_STATE_RESTARTING: + /* Expected by a caller of skd_soft_reset() */ + break; + default: + skdev->state = SKD_DRVR_STATE_RESTARTING; + break; + } + break; + case FIT_SR_DRIVE_FW_BOOTING: + pr_debug("%s:%s:%d ISR FIT_SR_DRIVE_FW_BOOTING %s\n", + skdev->name, __func__, __LINE__, skdev->name); + skdev->state = SKD_DRVR_STATE_WAIT_BOOT; + skdev->timer_countdown = SKD_WAIT_BOOT_TIMO; + break; + + case FIT_SR_DRIVE_DEGRADED: + case FIT_SR_PCIE_LINK_DOWN: + case FIT_SR_DRIVE_NEED_FW_DOWNLOAD: + break; + + case FIT_SR_DRIVE_FAULT: + skd_drive_fault(skdev); + skd_recover_requests(skdev, 0); + blk_start_queue(skdev->queue); + break; + + /* PCIe bus returned all Fs? */ + case 0xFF: + pr_info("(%s): state=0x%x sense=0x%x\n", + skd_name(skdev), state, sense); + skd_drive_disappeared(skdev); + skd_recover_requests(skdev, 0); + blk_start_queue(skdev->queue); + break; + default: + /* + * Uknown FW State. Wait for a state we recognize. + */ + break; + } + pr_err("(%s): Driver state %s(%d)=>%s(%d)\n", + skd_name(skdev), + skd_skdev_state_to_str(prev_driver_state), prev_driver_state, + skd_skdev_state_to_str(skdev->state), skdev->state); +} + +static void skd_recover_requests(struct skd_device *skdev, int requeue) +{ + int i; + + for (i = 0; i < skdev->num_req_context; i++) { + struct skd_request_context *skreq = &skdev->skreq_table[i]; + + if (skreq->state == SKD_REQ_STATE_BUSY) { + skd_log_skreq(skdev, skreq, "recover"); + + SKD_ASSERT((skreq->id & SKD_ID_INCR) != 0); + SKD_ASSERT(skreq->req != NULL); + + /* Release DMA resources for the request. */ + if (skreq->n_sg > 0) + skd_postop_sg_list(skdev, skreq); + + if (requeue && + (unsigned long) ++skreq->req->special < + SKD_MAX_RETRIES) + blk_requeue_request(skdev->queue, skreq->req); + else + skd_end_request(skdev, skreq, -EIO); + + skreq->req = NULL; + + skreq->state = SKD_REQ_STATE_IDLE; + skreq->id += SKD_ID_INCR; + } + if (i > 0) + skreq[-1].next = skreq; + skreq->next = NULL; + } + skdev->skreq_free_list = skdev->skreq_table; + + for (i = 0; i < skdev->num_fitmsg_context; i++) { + struct skd_fitmsg_context *skmsg = &skdev->skmsg_table[i]; + + if (skmsg->state == SKD_MSG_STATE_BUSY) { + skd_log_skmsg(skdev, skmsg, "salvaged"); + SKD_ASSERT((skmsg->id & SKD_ID_INCR) != 0); + skmsg->state = SKD_MSG_STATE_IDLE; + skmsg->id += SKD_ID_INCR; + } + if (i > 0) + skmsg[-1].next = skmsg; + skmsg->next = NULL; + } + skdev->skmsg_free_list = skdev->skmsg_table; + + for (i = 0; i < skdev->n_special; i++) { + struct skd_special_context *skspcl = &skdev->skspcl_table[i]; + + /* If orphaned, reclaim it because it has already been reported + * to the process as an error (it was just waiting for + * a completion that didn't come, and now it will never come) + * If busy, change to a state that will cause it to error + * out in the wait routine and let it do the normal + * reporting and reclaiming + */ + if (skspcl->req.state == SKD_REQ_STATE_BUSY) { + if (skspcl->orphaned) { + pr_debug("%s:%s:%d orphaned %p\n", + skdev->name, __func__, __LINE__, + skspcl); + skd_release_special(skdev, skspcl); + } else { + pr_debug("%s:%s:%d not orphaned %p\n", + skdev->name, __func__, __LINE__, + skspcl); + skspcl->req.state = SKD_REQ_STATE_ABORTED; + } + } + } + skdev->skspcl_free_list = skdev->skspcl_table; + + for (i = 0; i < SKD_N_TIMEOUT_SLOT; i++) + skdev->timeout_slot[i] = 0; + + skdev->in_flight = 0; +} + +static void skd_isr_msg_from_dev(struct skd_device *skdev) +{ + u32 mfd; + u32 mtd; + u32 data; + + mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE); + + pr_debug("%s:%s:%d mfd=0x%x last_mtd=0x%x\n", + skdev->name, __func__, __LINE__, mfd, skdev->last_mtd); + + /* ignore any mtd that is an ack for something we didn't send */ + if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd)) + return; + + switch (FIT_MXD_TYPE(mfd)) { + case FIT_MTD_FITFW_INIT: + skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd); + + if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) { + pr_err("(%s): protocol mismatch\n", + skdev->name); + pr_err("(%s): got=%d support=%d\n", + skdev->name, skdev->proto_ver, + FIT_PROTOCOL_VERSION_1); + pr_err("(%s): please upgrade driver\n", + skdev->name); + skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH; + skd_soft_reset(skdev); + break; + } + mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_GET_CMDQ_DEPTH: + skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd); + mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0, + SKD_N_COMPLETION_ENTRY); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_SET_COMPQ_DEPTH: + SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG); + mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_SET_COMPQ_ADDR: + skd_reset_skcomp(skdev); + mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_CMD_LOG_HOST_ID: + skdev->connect_time_stamp = get_seconds(); + data = skdev->connect_time_stamp & 0xFFFF; + mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_CMD_LOG_TIME_STAMP_LO: + skdev->drive_jiffies = FIT_MXD_DATA(mfd); + data = (skdev->connect_time_stamp >> 16) & 0xFFFF; + mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_CMD_LOG_TIME_STAMP_HI: + skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16); + mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + + pr_err("(%s): Time sync driver=0x%x device=0x%x\n", + skd_name(skdev), + skdev->connect_time_stamp, skdev->drive_jiffies); + break; + + case FIT_MTD_ARM_QUEUE: + skdev->last_mtd = 0; + /* + * State should be, or soon will be, FIT_SR_DRIVE_ONLINE. + */ + break; + + default: + break; + } +} + +static void skd_disable_interrupts(struct skd_device *skdev) +{ + u32 sense; + + sense = SKD_READL(skdev, FIT_CONTROL); + sense &= ~FIT_CR_ENABLE_INTERRUPTS; + SKD_WRITEL(skdev, sense, FIT_CONTROL); + pr_debug("%s:%s:%d sense 0x%x\n", + skdev->name, __func__, __LINE__, sense); + + /* Note that the 1s is written. A 1-bit means + * disable, a 0 means enable. + */ + SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST); +} + +static void skd_enable_interrupts(struct skd_device *skdev) +{ + u32 val; + + /* unmask interrupts first */ + val = FIT_ISH_FW_STATE_CHANGE + + FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV; + + /* Note that the compliment of mask is written. A 1-bit means + * disable, a 0 means enable. */ + SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST); + pr_debug("%s:%s:%d interrupt mask=0x%x\n", + skdev->name, __func__, __LINE__, ~val); + + val = SKD_READL(skdev, FIT_CONTROL); + val |= FIT_CR_ENABLE_INTERRUPTS; + pr_debug("%s:%s:%d control=0x%x\n", + skdev->name, __func__, __LINE__, val); + SKD_WRITEL(skdev, val, FIT_CONTROL); +} + +/* + ***************************************************************************** + * START, STOP, RESTART, QUIESCE, UNQUIESCE + ***************************************************************************** + */ + +static void skd_soft_reset(struct skd_device *skdev) +{ + u32 val; + + val = SKD_READL(skdev, FIT_CONTROL); + val |= (FIT_CR_SOFT_RESET); + pr_debug("%s:%s:%d control=0x%x\n", + skdev->name, __func__, __LINE__, val); + SKD_WRITEL(skdev, val, FIT_CONTROL); +} + +static void skd_start_device(struct skd_device *skdev) +{ + unsigned long flags; + u32 sense; + u32 state; + + spin_lock_irqsave(&skdev->lock, flags); + + /* ack all ghost interrupts */ + SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST); + + sense = SKD_READL(skdev, FIT_STATUS); + + pr_debug("%s:%s:%d initial status=0x%x\n", + skdev->name, __func__, __LINE__, sense); + + state = sense & FIT_SR_DRIVE_STATE_MASK; + skdev->drive_state = state; + skdev->last_mtd = 0; + + skdev->state = SKD_DRVR_STATE_STARTING; + skdev->timer_countdown = SKD_STARTING_TIMO; + + skd_enable_interrupts(skdev); + + switch (skdev->drive_state) { + case FIT_SR_DRIVE_OFFLINE: + pr_err("(%s): Drive offline...\n", skd_name(skdev)); + break; + + case FIT_SR_DRIVE_FW_BOOTING: + pr_debug("%s:%s:%d FIT_SR_DRIVE_FW_BOOTING %s\n", + skdev->name, __func__, __LINE__, skdev->name); + skdev->state = SKD_DRVR_STATE_WAIT_BOOT; + skdev->timer_countdown = SKD_WAIT_BOOT_TIMO; + break; + + case FIT_SR_DRIVE_BUSY_SANITIZE: + pr_info("(%s): Start: BUSY_SANITIZE\n", + skd_name(skdev)); + skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE; + skdev->timer_countdown = SKD_STARTED_BUSY_TIMO; + break; + + case FIT_SR_DRIVE_BUSY_ERASE: + pr_info("(%s): Start: BUSY_ERASE\n", skd_name(skdev)); + skdev->state = SKD_DRVR_STATE_BUSY_ERASE; + skdev->timer_countdown = SKD_STARTED_BUSY_TIMO; + break; + + case FIT_SR_DRIVE_INIT: + case FIT_SR_DRIVE_ONLINE: + skd_soft_reset(skdev); + break; + + case FIT_SR_DRIVE_BUSY: + pr_err("(%s): Drive Busy...\n", skd_name(skdev)); + skdev->state = SKD_DRVR_STATE_BUSY; + skdev->timer_countdown = SKD_STARTED_BUSY_TIMO; + break; + + case FIT_SR_DRIVE_SOFT_RESET: + pr_err("(%s) drive soft reset in prog\n", + skd_name(skdev)); + break; + + case FIT_SR_DRIVE_FAULT: + /* Fault state is bad...soft reset won't do it... + * Hard reset, maybe, but does it work on device? + * For now, just fault so the system doesn't hang. + */ + skd_drive_fault(skdev); + /*start the queue so we can respond with error to requests */ + pr_debug("%s:%s:%d starting %s queue\n", + skdev->name, __func__, __LINE__, skdev->name); + blk_start_queue(skdev->queue); + skdev->gendisk_on = -1; + wake_up_interruptible(&skdev->waitq); + break; + + case 0xFF: + /* Most likely the device isn't there or isn't responding + * to the BAR1 addresses. */ + skd_drive_disappeared(skdev); + /*start the queue so we can respond with error to requests */ + pr_debug("%s:%s:%d starting %s queue to error-out reqs\n", + skdev->name, __func__, __LINE__, skdev->name); + blk_start_queue(skdev->queue); + skdev->gendisk_on = -1; + wake_up_interruptible(&skdev->waitq); + break; + + default: + pr_err("(%s) Start: unknown state %x\n", + skd_name(skdev), skdev->drive_state); + break; + } + + state = SKD_READL(skdev, FIT_CONTROL); + pr_debug("%s:%s:%d FIT Control Status=0x%x\n", + skdev->name, __func__, __LINE__, state); + + state = SKD_READL(skdev, FIT_INT_STATUS_HOST); + pr_debug("%s:%s:%d Intr Status=0x%x\n", + skdev->name, __func__, __LINE__, state); + + state = SKD_READL(skdev, FIT_INT_MASK_HOST); + pr_debug("%s:%s:%d Intr Mask=0x%x\n", + skdev->name, __func__, __LINE__, state); + + state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE); + pr_debug("%s:%s:%d Msg from Dev=0x%x\n", + skdev->name, __func__, __LINE__, state); + + state = SKD_READL(skdev, FIT_HW_VERSION); + pr_debug("%s:%s:%d HW version=0x%x\n", + skdev->name, __func__, __LINE__, state); + + spin_unlock_irqrestore(&skdev->lock, flags); +} + +static void skd_stop_device(struct skd_device *skdev) +{ + unsigned long flags; + struct skd_special_context *skspcl = &skdev->internal_skspcl; + u32 dev_state; + int i; + + spin_lock_irqsave(&skdev->lock, flags); + + if (skdev->state != SKD_DRVR_STATE_ONLINE) { + pr_err("(%s): skd_stop_device not online no sync\n", + skd_name(skdev)); + goto stop_out; + } + + if (skspcl->req.state != SKD_REQ_STATE_IDLE) { + pr_err("(%s): skd_stop_device no special\n", + skd_name(skdev)); + goto stop_out; + } + + skdev->state = SKD_DRVR_STATE_SYNCING; + skdev->sync_done = 0; + + skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE); + + spin_unlock_irqrestore(&skdev->lock, flags); + + wait_event_interruptible_timeout(skdev->waitq, + (skdev->sync_done), (10 * HZ)); + + spin_lock_irqsave(&skdev->lock, flags); + + switch (skdev->sync_done) { + case 0: + pr_err("(%s): skd_stop_device no sync\n", + skd_name(skdev)); + break; + case 1: + pr_err("(%s): skd_stop_device sync done\n", + skd_name(skdev)); + break; + default: + pr_err("(%s): skd_stop_device sync error\n", + skd_name(skdev)); + } + +stop_out: + skdev->state = SKD_DRVR_STATE_STOPPING; + spin_unlock_irqrestore(&skdev->lock, flags); + + skd_kill_timer(skdev); + + spin_lock_irqsave(&skdev->lock, flags); + skd_disable_interrupts(skdev); + + /* ensure all ints on device are cleared */ + /* soft reset the device to unload with a clean slate */ + SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST); + SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL); + + spin_unlock_irqrestore(&skdev->lock, flags); + + /* poll every 100ms, 1 second timeout */ + for (i = 0; i < 10; i++) { + dev_state = + SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK; + if (dev_state == FIT_SR_DRIVE_INIT) + break; + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(msecs_to_jiffies(100)); + } + + if (dev_state != FIT_SR_DRIVE_INIT) + pr_err("(%s): skd_stop_device state error 0x%02x\n", + skd_name(skdev), dev_state); +} + +/* assume spinlock is held */ +static void skd_restart_device(struct skd_device *skdev) +{ + u32 state; + + /* ack all ghost interrupts */ + SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST); + + state = SKD_READL(skdev, FIT_STATUS); + + pr_debug("%s:%s:%d drive status=0x%x\n", + skdev->name, __func__, __LINE__, state); + + state &= FIT_SR_DRIVE_STATE_MASK; + skdev->drive_state = state; + skdev->last_mtd = 0; + + skdev->state = SKD_DRVR_STATE_RESTARTING; + skdev->timer_countdown = SKD_RESTARTING_TIMO; + + skd_soft_reset(skdev); +} + +/* assume spinlock is held */ +static int skd_quiesce_dev(struct skd_device *skdev) +{ + int rc = 0; + + switch (skdev->state) { + case SKD_DRVR_STATE_BUSY: + case SKD_DRVR_STATE_BUSY_IMMINENT: + pr_debug("%s:%s:%d stopping %s queue\n", + skdev->name, __func__, __LINE__, skdev->name); + blk_stop_queue(skdev->queue); + break; + case SKD_DRVR_STATE_ONLINE: + case SKD_DRVR_STATE_STOPPING: + case SKD_DRVR_STATE_SYNCING: + case SKD_DRVR_STATE_PAUSING: + case SKD_DRVR_STATE_PAUSED: + case SKD_DRVR_STATE_STARTING: + case SKD_DRVR_STATE_RESTARTING: + case SKD_DRVR_STATE_RESUMING: + default: + rc = -EINVAL; + pr_debug("%s:%s:%d state [%d] not implemented\n", + skdev->name, __func__, __LINE__, skdev->state); + } + return rc; +} + +/* assume spinlock is held */ +static int skd_unquiesce_dev(struct skd_device *skdev) +{ + int prev_driver_state = skdev->state; + + skd_log_skdev(skdev, "unquiesce"); + if (skdev->state == SKD_DRVR_STATE_ONLINE) { + pr_debug("%s:%s:%d **** device already ONLINE\n", + skdev->name, __func__, __LINE__); + return 0; + } + if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) { + /* + * If there has been an state change to other than + * ONLINE, we will rely on controller state change + * to come back online and restart the queue. + * The BUSY state means that driver is ready to + * continue normal processing but waiting for controller + * to become available. + */ + skdev->state = SKD_DRVR_STATE_BUSY; + pr_debug("%s:%s:%d drive BUSY state\n", + skdev->name, __func__, __LINE__); + return 0; + } + + /* + * Drive has just come online, driver is either in startup, + * paused performing a task, or bust waiting for hardware. + */ + switch (skdev->state) { + case SKD_DRVR_STATE_PAUSED: + case SKD_DRVR_STATE_BUSY: + case SKD_DRVR_STATE_BUSY_IMMINENT: + case SKD_DRVR_STATE_BUSY_ERASE: + case SKD_DRVR_STATE_STARTING: + case SKD_DRVR_STATE_RESTARTING: + case SKD_DRVR_STATE_FAULT: + case SKD_DRVR_STATE_IDLE: + case SKD_DRVR_STATE_LOAD: + skdev->state = SKD_DRVR_STATE_ONLINE; + pr_err("(%s): Driver state %s(%d)=>%s(%d)\n", + skd_name(skdev), + skd_skdev_state_to_str(prev_driver_state), + prev_driver_state, skd_skdev_state_to_str(skdev->state), + skdev->state); + pr_debug("%s:%s:%d **** device ONLINE...starting block queue\n", + skdev->name, __func__, __LINE__); + pr_debug("%s:%s:%d starting %s queue\n", + skdev->name, __func__, __LINE__, skdev->name); + pr_info("(%s): STEC s1120 ONLINE\n", skd_name(skdev)); + blk_start_queue(skdev->queue); + skdev->gendisk_on = 1; + wake_up_interruptible(&skdev->waitq); + break; + + case SKD_DRVR_STATE_DISAPPEARED: + default: + pr_debug("%s:%s:%d **** driver state %d, not implemented \n", + skdev->name, __func__, __LINE__, + skdev->state); + return -EBUSY; + } + return 0; +} + +/* + ***************************************************************************** + * PCIe MSI/MSI-X INTERRUPT HANDLERS + ***************************************************************************** + */ + +static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + + spin_lock_irqsave(&skdev->lock, flags); + pr_debug("%s:%s:%d MSIX = 0x%x\n", + skdev->name, __func__, __LINE__, + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + pr_err("(%s): MSIX reserved irq %d = 0x%x\n", skd_name(skdev), + irq, SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST); + spin_unlock_irqrestore(&skdev->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t skd_statec_isr(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + + spin_lock_irqsave(&skdev->lock, flags); + pr_debug("%s:%s:%d MSIX = 0x%x\n", + skdev->name, __func__, __LINE__, + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST); + skd_isr_fwstate(skdev); + spin_unlock_irqrestore(&skdev->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t skd_comp_q(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + int flush_enqueued = 0; + int deferred; + + spin_lock_irqsave(&skdev->lock, flags); + pr_debug("%s:%s:%d MSIX = 0x%x\n", + skdev->name, __func__, __LINE__, + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST); + deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit, + &flush_enqueued); + if (flush_enqueued) + skd_request_fn(skdev->queue); + + if (deferred) + schedule_work(&skdev->completion_worker); + else if (!flush_enqueued) + skd_request_fn(skdev->queue); + + spin_unlock_irqrestore(&skdev->lock, flags); + + return IRQ_HANDLED; +} + +static irqreturn_t skd_msg_isr(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + + spin_lock_irqsave(&skdev->lock, flags); + pr_debug("%s:%s:%d MSIX = 0x%x\n", + skdev->name, __func__, __LINE__, + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST); + skd_isr_msg_from_dev(skdev); + spin_unlock_irqrestore(&skdev->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + + spin_lock_irqsave(&skdev->lock, flags); + pr_debug("%s:%s:%d MSIX = 0x%x\n", + skdev->name, __func__, __LINE__, + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST); + spin_unlock_irqrestore(&skdev->lock, flags); + return IRQ_HANDLED; +} + +/* + ***************************************************************************** + * PCIe MSI/MSI-X SETUP + ***************************************************************************** + */ + +struct skd_msix_entry { + int have_irq; + u32 vector; + u32 entry; + struct skd_device *rsp; + char isr_name[30]; +}; + +struct skd_init_msix_entry { + const char *name; + irq_handler_t handler; +}; + +#define SKD_MAX_MSIX_COUNT 13 +#define SKD_MIN_MSIX_COUNT 7 +#define SKD_BASE_MSIX_IRQ 4 + +static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = { + { "(DMA 0)", skd_reserved_isr }, + { "(DMA 1)", skd_reserved_isr }, + { "(DMA 2)", skd_reserved_isr }, + { "(DMA 3)", skd_reserved_isr }, + { "(State Change)", skd_statec_isr }, + { "(COMPL_Q)", skd_comp_q }, + { "(MSG)", skd_msg_isr }, + { "(Reserved)", skd_reserved_isr }, + { "(Reserved)", skd_reserved_isr }, + { "(Queue Full 0)", skd_qfull_isr }, + { "(Queue Full 1)", skd_qfull_isr }, + { "(Queue Full 2)", skd_qfull_isr }, + { "(Queue Full 3)", skd_qfull_isr }, +}; + +static void skd_release_msix(struct skd_device *skdev) +{ + struct skd_msix_entry *qentry; + int i; + + if (skdev->msix_entries == NULL) + return; + for (i = 0; i < skdev->msix_count; i++) { + qentry = &skdev->msix_entries[i]; + skdev = qentry->rsp; + + if (qentry->have_irq) + devm_free_irq(&skdev->pdev->dev, + qentry->vector, qentry->rsp); + } + pci_disable_msix(skdev->pdev); + kfree(skdev->msix_entries); + skdev->msix_count = 0; + skdev->msix_entries = NULL; +} + +static int skd_acquire_msix(struct skd_device *skdev) +{ + int i, rc; + struct pci_dev *pdev; + struct msix_entry *entries = NULL; + struct skd_msix_entry *qentry; + + pdev = skdev->pdev; + skdev->msix_count = SKD_MAX_MSIX_COUNT; + entries = kzalloc(sizeof(struct msix_entry) * SKD_MAX_MSIX_COUNT, + GFP_KERNEL); + if (!entries) + return -ENOMEM; + + for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) + entries[i].entry = i; + + rc = pci_enable_msix(pdev, entries, SKD_MAX_MSIX_COUNT); + if (rc < 0) + goto msix_out; + if (rc) { + if (rc < SKD_MIN_MSIX_COUNT) { + pr_err("(%s): failed to enable MSI-X %d\n", + skd_name(skdev), rc); + goto msix_out; + } + pr_debug("%s:%s:%d %s: <%s> allocated %d MSI-X vectors\n", + skdev->name, __func__, __LINE__, + pci_name(pdev), skdev->name, rc); + + skdev->msix_count = rc; + rc = pci_enable_msix(pdev, entries, skdev->msix_count); + if (rc) { + pr_err("(%s): failed to enable MSI-X " + "support (%d) %d\n", + skd_name(skdev), skdev->msix_count, rc); + goto msix_out; + } + } + skdev->msix_entries = kzalloc(sizeof(struct skd_msix_entry) * + skdev->msix_count, GFP_KERNEL); + if (!skdev->msix_entries) { + rc = -ENOMEM; + skdev->msix_count = 0; + pr_err("(%s): msix table allocation error\n", + skd_name(skdev)); + goto msix_out; + } + + qentry = skdev->msix_entries; + for (i = 0; i < skdev->msix_count; i++) { + qentry->vector = entries[i].vector; + qentry->entry = entries[i].entry; + qentry->rsp = NULL; + qentry->have_irq = 0; + pr_debug("%s:%s:%d %s: <%s> msix (%d) vec %d, entry %x\n", + skdev->name, __func__, __LINE__, + pci_name(pdev), skdev->name, + i, qentry->vector, qentry->entry); + qentry++; + } + + /* Enable MSI-X vectors for the base queue */ + for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) { + qentry = &skdev->msix_entries[i]; + snprintf(qentry->isr_name, sizeof(qentry->isr_name), + "%s%d-msix %s", DRV_NAME, skdev->devno, + msix_entries[i].name); + rc = devm_request_irq(&skdev->pdev->dev, qentry->vector, + msix_entries[i].handler, 0, + qentry->isr_name, skdev); + if (rc) { + pr_err("(%s): Unable to register(%d) MSI-X " + "handler %d: %s\n", + skd_name(skdev), rc, i, qentry->isr_name); + goto msix_out; + } else { + qentry->have_irq = 1; + qentry->rsp = skdev; + } + } + pr_debug("%s:%s:%d %s: <%s> msix %d irq(s) enabled\n", + skdev->name, __func__, __LINE__, + pci_name(pdev), skdev->name, skdev->msix_count); + return 0; + +msix_out: + if (entries) + kfree(entries); + skd_release_msix(skdev); + return rc; +} + +static int skd_acquire_irq(struct skd_device *skdev) +{ + int rc; + struct pci_dev *pdev; + + pdev = skdev->pdev; + skdev->msix_count = 0; + +RETRY_IRQ_TYPE: + switch (skdev->irq_type) { + case SKD_IRQ_MSIX: + rc = skd_acquire_msix(skdev); + if (!rc) + pr_info("(%s): MSI-X %d irqs enabled\n", + skd_name(skdev), skdev->msix_count); + else { + pr_err( + "(%s): failed to enable MSI-X, re-trying with MSI %d\n", + skd_name(skdev), rc); + skdev->irq_type = SKD_IRQ_MSI; + goto RETRY_IRQ_TYPE; + } + break; + case SKD_IRQ_MSI: + snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d-msi", + DRV_NAME, skdev->devno); + rc = pci_enable_msi(pdev); + if (!rc) { + rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr, 0, + skdev->isr_name, skdev); + if (rc) { + pci_disable_msi(pdev); + pr_err( + "(%s): failed to allocate the MSI interrupt %d\n", + skd_name(skdev), rc); + goto RETRY_IRQ_LEGACY; + } + pr_info("(%s): MSI irq %d enabled\n", + skd_name(skdev), pdev->irq); + } else { +RETRY_IRQ_LEGACY: + pr_err( + "(%s): failed to enable MSI, re-trying with LEGACY %d\n", + skd_name(skdev), rc); + skdev->irq_type = SKD_IRQ_LEGACY; + goto RETRY_IRQ_TYPE; + } + break; + case SKD_IRQ_LEGACY: + snprintf(skdev->isr_name, sizeof(skdev->isr_name), + "%s%d-legacy", DRV_NAME, skdev->devno); + rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr, + IRQF_SHARED, skdev->isr_name, skdev); + if (!rc) + pr_info("(%s): LEGACY irq %d enabled\n", + skd_name(skdev), pdev->irq); + else + pr_err("(%s): request LEGACY irq error %d\n", + skd_name(skdev), rc); + break; + default: + pr_info("(%s): irq_type %d invalid, re-set to %d\n", + skd_name(skdev), skdev->irq_type, SKD_IRQ_DEFAULT); + skdev->irq_type = SKD_IRQ_LEGACY; + goto RETRY_IRQ_TYPE; + } + return rc; +} + +static void skd_release_irq(struct skd_device *skdev) +{ + switch (skdev->irq_type) { + case SKD_IRQ_MSIX: + skd_release_msix(skdev); + break; + case SKD_IRQ_MSI: + devm_free_irq(&skdev->pdev->dev, skdev->pdev->irq, skdev); + pci_disable_msi(skdev->pdev); + break; + case SKD_IRQ_LEGACY: + devm_free_irq(&skdev->pdev->dev, skdev->pdev->irq, skdev); + break; + default: + pr_err("(%s): wrong irq type %d!", + skd_name(skdev), skdev->irq_type); + break; + } +} + +/* + ***************************************************************************** + * CONSTRUCT + ***************************************************************************** + */ + +static int skd_cons_skcomp(struct skd_device *skdev) +{ + int rc = 0; + struct fit_completion_entry_v1 *skcomp; + u32 nbytes; + + nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY; + nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY; + + pr_debug("%s:%s:%d comp pci_alloc, total bytes %d entries %d\n", + skdev->name, __func__, __LINE__, + nbytes, SKD_N_COMPLETION_ENTRY); + + skcomp = pci_alloc_consistent(skdev->pdev, nbytes, + &skdev->cq_dma_address); + + if (skcomp == NULL) { + rc = -ENOMEM; + goto err_out; + } + + memset(skcomp, 0, nbytes); + + skdev->skcomp_table = skcomp; + skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp + + sizeof(*skcomp) * + SKD_N_COMPLETION_ENTRY); + +err_out: + return rc; +} + +static int skd_cons_skmsg(struct skd_device *skdev) +{ + int rc = 0; + u32 i; + + pr_debug("%s:%s:%d skmsg_table kzalloc, struct %lu, count %u total %lu\n", + skdev->name, __func__, __LINE__, + sizeof(struct skd_fitmsg_context), + skdev->num_fitmsg_context, + sizeof(struct skd_fitmsg_context) * skdev->num_fitmsg_context); + + skdev->skmsg_table = kzalloc(sizeof(struct skd_fitmsg_context) + *skdev->num_fitmsg_context, GFP_KERNEL); + if (skdev->skmsg_table == NULL) { + rc = -ENOMEM; + goto err_out; + } + + for (i = 0; i < skdev->num_fitmsg_context; i++) { + struct skd_fitmsg_context *skmsg; + + skmsg = &skdev->skmsg_table[i]; + + skmsg->id = i + SKD_ID_FIT_MSG; + + skmsg->state = SKD_MSG_STATE_IDLE; + skmsg->msg_buf = pci_alloc_consistent(skdev->pdev, + SKD_N_FITMSG_BYTES + 64, + &skmsg->mb_dma_address); + + if (skmsg->msg_buf == NULL) { + rc = -ENOMEM; + goto err_out; + } + + skmsg->offset = (u32)((u64)skmsg->msg_buf & + (~FIT_QCMD_BASE_ADDRESS_MASK)); + skmsg->msg_buf += ~FIT_QCMD_BASE_ADDRESS_MASK; + skmsg->msg_buf = (u8 *)((u64)skmsg->msg_buf & + FIT_QCMD_BASE_ADDRESS_MASK); + skmsg->mb_dma_address += ~FIT_QCMD_BASE_ADDRESS_MASK; + skmsg->mb_dma_address &= FIT_QCMD_BASE_ADDRESS_MASK; + memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES); + + skmsg->next = &skmsg[1]; + } + + /* Free list is in order starting with the 0th entry. */ + skdev->skmsg_table[i - 1].next = NULL; + skdev->skmsg_free_list = skdev->skmsg_table; + +err_out: + return rc; +} + +static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev, + u32 n_sg, + dma_addr_t *ret_dma_addr) +{ + struct fit_sg_descriptor *sg_list; + u32 nbytes; + + nbytes = sizeof(*sg_list) * n_sg; + + sg_list = pci_alloc_consistent(skdev->pdev, nbytes, ret_dma_addr); + + if (sg_list != NULL) { + uint64_t dma_address = *ret_dma_addr; + u32 i; + + memset(sg_list, 0, nbytes); + + for (i = 0; i < n_sg - 1; i++) { + uint64_t ndp_off; + ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor); + + sg_list[i].next_desc_ptr = dma_address + ndp_off; + } + sg_list[i].next_desc_ptr = 0LL; + } + + return sg_list; +} + +static int skd_cons_skreq(struct skd_device *skdev) +{ + int rc = 0; + u32 i; + + pr_debug("%s:%s:%d skreq_table kzalloc, struct %lu, count %u total %lu\n", + skdev->name, __func__, __LINE__, + sizeof(struct skd_request_context), + skdev->num_req_context, + sizeof(struct skd_request_context) * skdev->num_req_context); + + skdev->skreq_table = kzalloc(sizeof(struct skd_request_context) + * skdev->num_req_context, GFP_KERNEL); + if (skdev->skreq_table == NULL) { + rc = -ENOMEM; + goto err_out; + } + + pr_debug("%s:%s:%d alloc sg_table sg_per_req %u scatlist %lu total %lu\n", + skdev->name, __func__, __LINE__, + skdev->sgs_per_request, sizeof(struct scatterlist), + skdev->sgs_per_request * sizeof(struct scatterlist)); + + for (i = 0; i < skdev->num_req_context; i++) { + struct skd_request_context *skreq; + + skreq = &skdev->skreq_table[i]; + + skreq->id = i + SKD_ID_RW_REQUEST; + skreq->state = SKD_REQ_STATE_IDLE; + + skreq->sg = kzalloc(sizeof(struct scatterlist) * + skdev->sgs_per_request, GFP_KERNEL); + if (skreq->sg == NULL) { + rc = -ENOMEM; + goto err_out; + } + sg_init_table(skreq->sg, skdev->sgs_per_request); + + skreq->sksg_list = skd_cons_sg_list(skdev, + skdev->sgs_per_request, + &skreq->sksg_dma_address); + + if (skreq->sksg_list == NULL) { + rc = -ENOMEM; + goto err_out; + } + + skreq->next = &skreq[1]; + } + + /* Free list is in order starting with the 0th entry. */ + skdev->skreq_table[i - 1].next = NULL; + skdev->skreq_free_list = skdev->skreq_table; + +err_out: + return rc; +} + +static int skd_cons_skspcl(struct skd_device *skdev) +{ + int rc = 0; + u32 i, nbytes; + + pr_debug("%s:%s:%d skspcl_table kzalloc, struct %lu, count %u total %lu\n", + skdev->name, __func__, __LINE__, + sizeof(struct skd_special_context), + skdev->n_special, + sizeof(struct skd_special_context) * skdev->n_special); + + skdev->skspcl_table = kzalloc(sizeof(struct skd_special_context) + * skdev->n_special, GFP_KERNEL); + if (skdev->skspcl_table == NULL) { + rc = -ENOMEM; + goto err_out; + } + + for (i = 0; i < skdev->n_special; i++) { + struct skd_special_context *skspcl; + + skspcl = &skdev->skspcl_table[i]; + + skspcl->req.id = i + SKD_ID_SPECIAL_REQUEST; + skspcl->req.state = SKD_REQ_STATE_IDLE; + + skspcl->req.next = &skspcl[1].req; + + nbytes = SKD_N_SPECIAL_FITMSG_BYTES; + + skspcl->msg_buf = pci_alloc_consistent(skdev->pdev, nbytes, + &skspcl->mb_dma_address); + if (skspcl->msg_buf == NULL) { + rc = -ENOMEM; + goto err_out; + } + + memset(skspcl->msg_buf, 0, nbytes); + + skspcl->req.sg = kzalloc(sizeof(struct scatterlist) * + SKD_N_SG_PER_SPECIAL, GFP_KERNEL); + if (skspcl->req.sg == NULL) { + rc = -ENOMEM; + goto err_out; + } + + skspcl->req.sksg_list = skd_cons_sg_list(skdev, + SKD_N_SG_PER_SPECIAL, + &skspcl->req. + sksg_dma_address); + if (skspcl->req.sksg_list == NULL) { + rc = -ENOMEM; + goto err_out; + } + } + + /* Free list is in order starting with the 0th entry. */ + skdev->skspcl_table[i - 1].req.next = NULL; + skdev->skspcl_free_list = skdev->skspcl_table; + + return rc; + +err_out: + return rc; +} + +static int skd_cons_sksb(struct skd_device *skdev) +{ + int rc = 0; + struct skd_special_context *skspcl; + u32 nbytes; + + skspcl = &skdev->internal_skspcl; + + skspcl->req.id = 0 + SKD_ID_INTERNAL; + skspcl->req.state = SKD_REQ_STATE_IDLE; + + nbytes = SKD_N_INTERNAL_BYTES; + + skspcl->data_buf = pci_alloc_consistent(skdev->pdev, nbytes, + &skspcl->db_dma_address); + if (skspcl->data_buf == NULL) { + rc = -ENOMEM; + goto err_out; + } + + memset(skspcl->data_buf, 0, nbytes); + + nbytes = SKD_N_SPECIAL_FITMSG_BYTES; + skspcl->msg_buf = pci_alloc_consistent(skdev->pdev, nbytes, + &skspcl->mb_dma_address); + if (skspcl->msg_buf == NULL) { + rc = -ENOMEM; + goto err_out; + } + + memset(skspcl->msg_buf, 0, nbytes); + + skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1, + &skspcl->req.sksg_dma_address); + if (skspcl->req.sksg_list == NULL) { + rc = -ENOMEM; + goto err_out; + } + + if (!skd_format_internal_skspcl(skdev)) { + rc = -EINVAL; + goto err_out; + } + +err_out: + return rc; +} + +static int skd_cons_disk(struct skd_device *skdev) +{ + int rc = 0; + struct gendisk *disk; + struct request_queue *q; + unsigned long flags; + + disk = alloc_disk(SKD_MINORS_PER_DEVICE); + if (!disk) { + rc = -ENOMEM; + goto err_out; + } + + skdev->disk = disk; + sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno); + + disk->major = skdev->major; + disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE; + disk->fops = &skd_blockdev_ops; + disk->private_data = skdev; + + q = blk_init_queue(skd_request_fn, &skdev->lock); + if (!q) { + rc = -ENOMEM; + goto err_out; + } + + skdev->queue = q; + disk->queue = q; + q->queuedata = skdev; + + blk_queue_flush(q, REQ_FLUSH | REQ_FUA); + blk_queue_max_segments(q, skdev->sgs_per_request); + blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS); + + /* set sysfs ptimal_io_size to 8K */ + blk_queue_io_opt(q, 8192); + + /* DISCARD Flag initialization. */ + q->limits.discard_granularity = 8192; + q->limits.discard_alignment = 0; + q->limits.max_discard_sectors = UINT_MAX >> 9; + q->limits.discard_zeroes_data = 1; + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); + queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); + + spin_lock_irqsave(&skdev->lock, flags); + pr_debug("%s:%s:%d stopping %s queue\n", + skdev->name, __func__, __LINE__, skdev->name); + blk_stop_queue(skdev->queue); + spin_unlock_irqrestore(&skdev->lock, flags); + +err_out: + return rc; +} + +#define SKD_N_DEV_TABLE 16u +static u32 skd_next_devno; + +static struct skd_device *skd_construct(struct pci_dev *pdev) +{ + struct skd_device *skdev; + int blk_major = skd_major; + int rc; + + skdev = kzalloc(sizeof(*skdev), GFP_KERNEL); + + if (!skdev) { + pr_err(PFX "(%s): memory alloc failure\n", + pci_name(pdev)); + return NULL; + } + + skdev->state = SKD_DRVR_STATE_LOAD; + skdev->pdev = pdev; + skdev->devno = skd_next_devno++; + skdev->major = blk_major; + skdev->irq_type = skd_isr_type; + sprintf(skdev->name, DRV_NAME "%d", skdev->devno); + skdev->dev_max_queue_depth = 0; + + skdev->num_req_context = skd_max_queue_depth; + skdev->num_fitmsg_context = skd_max_queue_depth; + skdev->n_special = skd_max_pass_thru; + skdev->cur_max_queue_depth = 1; + skdev->queue_low_water_mark = 1; + skdev->proto_ver = 99; + skdev->sgs_per_request = skd_sgs_per_request; + skdev->dbg_level = skd_dbg_level; + + atomic_set(&skdev->device_count, 0); + + spin_lock_init(&skdev->lock); + + INIT_WORK(&skdev->completion_worker, skd_completion_worker); + + pr_debug("%s:%s:%d skcomp\n", skdev->name, __func__, __LINE__); + rc = skd_cons_skcomp(skdev); + if (rc < 0) + goto err_out; + + pr_debug("%s:%s:%d skmsg\n", skdev->name, __func__, __LINE__); + rc = skd_cons_skmsg(skdev); + if (rc < 0) + goto err_out; + + pr_debug("%s:%s:%d skreq\n", skdev->name, __func__, __LINE__); + rc = skd_cons_skreq(skdev); + if (rc < 0) + goto err_out; + + pr_debug("%s:%s:%d skspcl\n", skdev->name, __func__, __LINE__); + rc = skd_cons_skspcl(skdev); + if (rc < 0) + goto err_out; + + pr_debug("%s:%s:%d sksb\n", skdev->name, __func__, __LINE__); + rc = skd_cons_sksb(skdev); + if (rc < 0) + goto err_out; + + pr_debug("%s:%s:%d disk\n", skdev->name, __func__, __LINE__); + rc = skd_cons_disk(skdev); + if (rc < 0) + goto err_out; + + pr_debug("%s:%s:%d VICTORY\n", skdev->name, __func__, __LINE__); + return skdev; + +err_out: + pr_debug("%s:%s:%d construct failed\n", + skdev->name, __func__, __LINE__); + skd_destruct(skdev); + return NULL; +} + +/* + ***************************************************************************** + * DESTRUCT (FREE) + ***************************************************************************** + */ + +static void skd_free_skcomp(struct skd_device *skdev) +{ + if (skdev->skcomp_table != NULL) { + u32 nbytes; + + nbytes = sizeof(skdev->skcomp_table[0]) * + SKD_N_COMPLETION_ENTRY; + pci_free_consistent(skdev->pdev, nbytes, + skdev->skcomp_table, skdev->cq_dma_address); + } + + skdev->skcomp_table = NULL; + skdev->cq_dma_address = 0; +} + +static void skd_free_skmsg(struct skd_device *skdev) +{ + u32 i; + + if (skdev->skmsg_table == NULL) + return; + + for (i = 0; i < skdev->num_fitmsg_context; i++) { + struct skd_fitmsg_context *skmsg; + + skmsg = &skdev->skmsg_table[i]; + + if (skmsg->msg_buf != NULL) { + skmsg->msg_buf += skmsg->offset; + skmsg->mb_dma_address += skmsg->offset; + pci_free_consistent(skdev->pdev, SKD_N_FITMSG_BYTES, + skmsg->msg_buf, + skmsg->mb_dma_address); + } + skmsg->msg_buf = NULL; + skmsg->mb_dma_address = 0; + } + + kfree(skdev->skmsg_table); + skdev->skmsg_table = NULL; +} + +static void skd_free_sg_list(struct skd_device *skdev, + struct fit_sg_descriptor *sg_list, + u32 n_sg, dma_addr_t dma_addr) +{ + if (sg_list != NULL) { + u32 nbytes; + + nbytes = sizeof(*sg_list) * n_sg; + + pci_free_consistent(skdev->pdev, nbytes, sg_list, dma_addr); + } +} + +static void skd_free_skreq(struct skd_device *skdev) +{ + u32 i; + + if (skdev->skreq_table == NULL) + return; + + for (i = 0; i < skdev->num_req_context; i++) { + struct skd_request_context *skreq; + + skreq = &skdev->skreq_table[i]; + + skd_free_sg_list(skdev, skreq->sksg_list, + skdev->sgs_per_request, + skreq->sksg_dma_address); + + skreq->sksg_list = NULL; + skreq->sksg_dma_address = 0; + + kfree(skreq->sg); + } + + kfree(skdev->skreq_table); + skdev->skreq_table = NULL; +} + +static void skd_free_skspcl(struct skd_device *skdev) +{ + u32 i; + u32 nbytes; + + if (skdev->skspcl_table == NULL) + return; + + for (i = 0; i < skdev->n_special; i++) { + struct skd_special_context *skspcl; + + skspcl = &skdev->skspcl_table[i]; + + if (skspcl->msg_buf != NULL) { + nbytes = SKD_N_SPECIAL_FITMSG_BYTES; + pci_free_consistent(skdev->pdev, nbytes, + skspcl->msg_buf, + skspcl->mb_dma_address); + } + + skspcl->msg_buf = NULL; + skspcl->mb_dma_address = 0; + + skd_free_sg_list(skdev, skspcl->req.sksg_list, + SKD_N_SG_PER_SPECIAL, + skspcl->req.sksg_dma_address); + + skspcl->req.sksg_list = NULL; + skspcl->req.sksg_dma_address = 0; + + kfree(skspcl->req.sg); + } + + kfree(skdev->skspcl_table); + skdev->skspcl_table = NULL; +} + +static void skd_free_sksb(struct skd_device *skdev) +{ + struct skd_special_context *skspcl; + u32 nbytes; + + skspcl = &skdev->internal_skspcl; + + if (skspcl->data_buf != NULL) { + nbytes = SKD_N_INTERNAL_BYTES; + + pci_free_consistent(skdev->pdev, nbytes, + skspcl->data_buf, skspcl->db_dma_address); + } + + skspcl->data_buf = NULL; + skspcl->db_dma_address = 0; + + if (skspcl->msg_buf != NULL) { + nbytes = SKD_N_SPECIAL_FITMSG_BYTES; + pci_free_consistent(skdev->pdev, nbytes, + skspcl->msg_buf, skspcl->mb_dma_address); + } + + skspcl->msg_buf = NULL; + skspcl->mb_dma_address = 0; + + skd_free_sg_list(skdev, skspcl->req.sksg_list, 1, + skspcl->req.sksg_dma_address); + + skspcl->req.sksg_list = NULL; + skspcl->req.sksg_dma_address = 0; +} + +static void skd_free_disk(struct skd_device *skdev) +{ + struct gendisk *disk = skdev->disk; + + if (disk != NULL) { + struct request_queue *q = disk->queue; + + if (disk->flags & GENHD_FL_UP) + del_gendisk(disk); + if (q) + blk_cleanup_queue(q); + put_disk(disk); + } + skdev->disk = NULL; +} + +static void skd_destruct(struct skd_device *skdev) +{ + if (skdev == NULL) + return; + + + pr_debug("%s:%s:%d disk\n", skdev->name, __func__, __LINE__); + skd_free_disk(skdev); + + pr_debug("%s:%s:%d sksb\n", skdev->name, __func__, __LINE__); + skd_free_sksb(skdev); + + pr_debug("%s:%s:%d skspcl\n", skdev->name, __func__, __LINE__); + skd_free_skspcl(skdev); + + pr_debug("%s:%s:%d skreq\n", skdev->name, __func__, __LINE__); + skd_free_skreq(skdev); + + pr_debug("%s:%s:%d skmsg\n", skdev->name, __func__, __LINE__); + skd_free_skmsg(skdev); + + pr_debug("%s:%s:%d skcomp\n", skdev->name, __func__, __LINE__); + skd_free_skcomp(skdev); + + pr_debug("%s:%s:%d skdev\n", skdev->name, __func__, __LINE__); + kfree(skdev); +} + +/* + ***************************************************************************** + * BLOCK DEVICE (BDEV) GLUE + ***************************************************************************** + */ + +static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct skd_device *skdev; + u64 capacity; + + skdev = bdev->bd_disk->private_data; + + pr_debug("%s:%s:%d %s: CMD[%s] getgeo device\n", + skdev->name, __func__, __LINE__, + bdev->bd_disk->disk_name, current->comm); + + if (skdev->read_cap_is_valid) { + capacity = get_capacity(skdev->disk); + geo->heads = 64; + geo->sectors = 255; + geo->cylinders = (capacity) / (255 * 64); + + return 0; + } + return -EIO; +} + +static int skd_bdev_attach(struct skd_device *skdev) +{ + pr_debug("%s:%s:%d add_disk\n", skdev->name, __func__, __LINE__); + add_disk(skdev->disk); + return 0; +} + +static const struct block_device_operations skd_blockdev_ops = { + .owner = THIS_MODULE, + .ioctl = skd_bdev_ioctl, + .getgeo = skd_bdev_getgeo, +}; + + +/* + ***************************************************************************** + * PCIe DRIVER GLUE + ***************************************************************************** + */ + +static DEFINE_PCI_DEVICE_TABLE(skd_pci_tbl) = { + { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120, + PCI_ANY_ID, PCI_ANY_ID, 0, 0, }, + { 0 } /* terminate list */ +}; + +MODULE_DEVICE_TABLE(pci, skd_pci_tbl); + +static char *skd_pci_info(struct skd_device *skdev, char *str) +{ + int pcie_reg; + + strcpy(str, "PCIe ("); + pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP); + + if (pcie_reg) { + + char lwstr[6]; + uint16_t pcie_lstat, lspeed, lwidth; + + pcie_reg += 0x12; + pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat); + lspeed = pcie_lstat & (0xF); + lwidth = (pcie_lstat & 0x3F0) >> 4; + + if (lspeed == 1) + strcat(str, "2.5GT/s "); + else if (lspeed == 2) + strcat(str, "5.0GT/s "); + else + strcat(str, "<unknown> "); + snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth); + strcat(str, lwstr); + } + return str; +} + +static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + int i; + int rc = 0; + char pci_str[32]; + struct skd_device *skdev; + + pr_info("STEC s1120 Driver(%s) version %s-b%s\n", + DRV_NAME, DRV_VERSION, DRV_BUILD_ID); + pr_info("(skd?:??:[%s]): vendor=%04X device=%04x\n", + pci_name(pdev), pdev->vendor, pdev->device); + + rc = pci_enable_device(pdev); + if (rc) + return rc; + rc = pci_request_regions(pdev, DRV_NAME); + if (rc) + goto err_out; + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); + if (!rc) { + if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) { + + pr_err("(%s): consistent DMA mask error %d\n", + pci_name(pdev), rc); + } + } else { + (rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32))); + if (rc) { + + pr_err("(%s): DMA mask error %d\n", + pci_name(pdev), rc); + goto err_out_regions; + } + } + + if (!skd_major) { + rc = register_blkdev(0, DRV_NAME); + if (rc < 0) + goto err_out_regions; + BUG_ON(!rc); + skd_major = rc; + } + + skdev = skd_construct(pdev); + if (skdev == NULL) { + rc = -ENOMEM; + goto err_out_regions; + } + + skd_pci_info(skdev, pci_str); + pr_info("(%s): %s 64bit\n", skd_name(skdev), pci_str); + + pci_set_master(pdev); + rc = pci_enable_pcie_error_reporting(pdev); + if (rc) { + pr_err( + "(%s): bad enable of PCIe error reporting rc=%d\n", + skd_name(skdev), rc); + skdev->pcie_error_reporting_is_enabled = 0; + } else + skdev->pcie_error_reporting_is_enabled = 1; + + + pci_set_drvdata(pdev, skdev); + + skdev->disk->driverfs_dev = &pdev->dev; + + for (i = 0; i < SKD_MAX_BARS; i++) { + skdev->mem_phys[i] = pci_resource_start(pdev, i); + skdev->mem_size[i] = (u32)pci_resource_len(pdev, i); + skdev->mem_map[i] = ioremap(skdev->mem_phys[i], + skdev->mem_size[i]); + if (!skdev->mem_map[i]) { + pr_err("(%s): Unable to map adapter memory!\n", + skd_name(skdev)); + rc = -ENODEV; + goto err_out_iounmap; + } + pr_debug("%s:%s:%d mem_map=%p, phyd=%016llx, size=%d\n", + skdev->name, __func__, __LINE__, + skdev->mem_map[i], + (uint64_t)skdev->mem_phys[i], skdev->mem_size[i]); + } + + rc = skd_acquire_irq(skdev); + if (rc) { + pr_err("(%s): interrupt resource error %d\n", + skd_name(skdev), rc); + goto err_out_iounmap; + } + + rc = skd_start_timer(skdev); + if (rc) + goto err_out_timer; + + init_waitqueue_head(&skdev->waitq); + + skd_start_device(skdev); + + rc = wait_event_interruptible_timeout(skdev->waitq, + (skdev->gendisk_on), + (SKD_START_WAIT_SECONDS * HZ)); + if (skdev->gendisk_on > 0) { + /* device came on-line after reset */ + skd_bdev_attach(skdev); + rc = 0; + } else { + /* we timed out, something is wrong with the device, + don't add the disk structure */ + pr_err( + "(%s): error: waiting for s1120 timed out %d!\n", + skd_name(skdev), rc); + /* in case of no error; we timeout with ENXIO */ + if (!rc) + rc = -ENXIO; + goto err_out_timer; + } + + +#ifdef SKD_VMK_POLL_HANDLER + if (skdev->irq_type == SKD_IRQ_MSIX) { + /* MSIX completion handler is being used for coredump */ + vmklnx_scsi_register_poll_handler(skdev->scsi_host, + skdev->msix_entries[5].vector, + skd_comp_q, skdev); + } else { + vmklnx_scsi_register_poll_handler(skdev->scsi_host, + skdev->pdev->irq, skd_isr, + skdev); + } +#endif /* SKD_VMK_POLL_HANDLER */ + + return rc; + +err_out_timer: + skd_stop_device(skdev); + skd_release_irq(skdev); + +err_out_iounmap: + for (i = 0; i < SKD_MAX_BARS; i++) + if (skdev->mem_map[i]) + iounmap(skdev->mem_map[i]); + + if (skdev->pcie_error_reporting_is_enabled) + pci_disable_pcie_error_reporting(pdev); + + skd_destruct(skdev); + +err_out_regions: + pci_release_regions(pdev); + +err_out: + pci_disable_device(pdev); + pci_set_drvdata(pdev, NULL); + return rc; +} + +static void skd_pci_remove(struct pci_dev *pdev) +{ + int i; + struct skd_device *skdev; + + skdev = pci_get_drvdata(pdev); + if (!skdev) { + pr_err("%s: no device data for PCI\n", pci_name(pdev)); + return; + } + skd_stop_device(skdev); + skd_release_irq(skdev); + + for (i = 0; i < SKD_MAX_BARS; i++) + if (skdev->mem_map[i]) + iounmap((u32 *)skdev->mem_map[i]); + + if (skdev->pcie_error_reporting_is_enabled) + pci_disable_pcie_error_reporting(pdev); + + skd_destruct(skdev); + + pci_release_regions(pdev); + pci_disable_device(pdev); + pci_set_drvdata(pdev, NULL); + + return; +} + +static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state) +{ + int i; + struct skd_device *skdev; + + skdev = pci_get_drvdata(pdev); + if (!skdev) { + pr_err("%s: no device data for PCI\n", pci_name(pdev)); + return -EIO; + } + + skd_stop_device(skdev); + + skd_release_irq(skdev); + + for (i = 0; i < SKD_MAX_BARS; i++) + if (skdev->mem_map[i]) + iounmap((u32 *)skdev->mem_map[i]); + + if (skdev->pcie_error_reporting_is_enabled) + pci_disable_pcie_error_reporting(pdev); + + pci_release_regions(pdev); + pci_save_state(pdev); + pci_disable_device(pdev); + pci_set_power_state(pdev, pci_choose_state(pdev, state)); + return 0; +} + +static int skd_pci_resume(struct pci_dev *pdev) +{ + int i; + int rc = 0; + struct skd_device *skdev; + + skdev = pci_get_drvdata(pdev); + if (!skdev) { + pr_err("%s: no device data for PCI\n", pci_name(pdev)); + return -1; + } + + pci_set_power_state(pdev, PCI_D0); + pci_enable_wake(pdev, PCI_D0, 0); + pci_restore_state(pdev); + + rc = pci_enable_device(pdev); + if (rc) + return rc; + rc = pci_request_regions(pdev, DRV_NAME); + if (rc) + goto err_out; + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); + if (!rc) { + if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) { + + pr_err("(%s): consistent DMA mask error %d\n", + pci_name(pdev), rc); + } + } else { + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (rc) { + + pr_err("(%s): DMA mask error %d\n", + pci_name(pdev), rc); + goto err_out_regions; + } + } + + pci_set_master(pdev); + rc = pci_enable_pcie_error_reporting(pdev); + if (rc) { + pr_err("(%s): bad enable of PCIe error reporting rc=%d\n", + skdev->name, rc); + skdev->pcie_error_reporting_is_enabled = 0; + } else + skdev->pcie_error_reporting_is_enabled = 1; + + for (i = 0; i < SKD_MAX_BARS; i++) { + + skdev->mem_phys[i] = pci_resource_start(pdev, i); + skdev->mem_size[i] = (u32)pci_resource_len(pdev, i); + skdev->mem_map[i] = ioremap(skdev->mem_phys[i], + skdev->mem_size[i]); + if (!skdev->mem_map[i]) { + pr_err("(%s): Unable to map adapter memory!\n", + skd_name(skdev)); + rc = -ENODEV; + goto err_out_iounmap; + } + pr_debug("%s:%s:%d mem_map=%p, phyd=%016llx, size=%d\n", + skdev->name, __func__, __LINE__, + skdev->mem_map[i], + (uint64_t)skdev->mem_phys[i], skdev->mem_size[i]); + } + rc = skd_acquire_irq(skdev); + if (rc) { + + pr_err("(%s): interrupt resource error %d\n", + pci_name(pdev), rc); + goto err_out_iounmap; + } + + rc = skd_start_timer(skdev); + if (rc) + goto err_out_timer; + + init_waitqueue_head(&skdev->waitq); + + skd_start_device(skdev); + + return rc; + +err_out_timer: + skd_stop_device(skdev); + skd_release_irq(skdev); + +err_out_iounmap: + for (i = 0; i < SKD_MAX_BARS; i++) + if (skdev->mem_map[i]) + iounmap(skdev->mem_map[i]); + + if (skdev->pcie_error_reporting_is_enabled) + pci_disable_pcie_error_reporting(pdev); + +err_out_regions: + pci_release_regions(pdev); + +err_out: + pci_disable_device(pdev); + return rc; +} + +static void skd_pci_shutdown(struct pci_dev *pdev) +{ + struct skd_device *skdev; + + pr_err("skd_pci_shutdown called\n"); + + skdev = pci_get_drvdata(pdev); + if (!skdev) { + pr_err("%s: no device data for PCI\n", pci_name(pdev)); + return; + } + + pr_err("%s: calling stop\n", skd_name(skdev)); + skd_stop_device(skdev); +} + +static struct pci_driver skd_driver = { + .name = DRV_NAME, + .id_table = skd_pci_tbl, + .probe = skd_pci_probe, + .remove = skd_pci_remove, + .suspend = skd_pci_suspend, + .resume = skd_pci_resume, + .shutdown = skd_pci_shutdown, +}; + +/* + ***************************************************************************** + * LOGGING SUPPORT + ***************************************************************************** + */ + +static const char *skd_name(struct skd_device *skdev) +{ + memset(skdev->id_str, 0, sizeof(skdev->id_str)); + + if (skdev->inquiry_is_valid) + snprintf(skdev->id_str, sizeof(skdev->id_str), "%s:%s:[%s]", + skdev->name, skdev->inq_serial_num, + pci_name(skdev->pdev)); + else + snprintf(skdev->id_str, sizeof(skdev->id_str), "%s:??:[%s]", + skdev->name, pci_name(skdev->pdev)); + + return skdev->id_str; +} + +const char *skd_drive_state_to_str(int state) +{ + switch (state) { + case FIT_SR_DRIVE_OFFLINE: + return "OFFLINE"; + case FIT_SR_DRIVE_INIT: + return "INIT"; + case FIT_SR_DRIVE_ONLINE: + return "ONLINE"; + case FIT_SR_DRIVE_BUSY: + return "BUSY"; + case FIT_SR_DRIVE_FAULT: + return "FAULT"; + case FIT_SR_DRIVE_DEGRADED: + return "DEGRADED"; + case FIT_SR_PCIE_LINK_DOWN: + return "INK_DOWN"; + case FIT_SR_DRIVE_SOFT_RESET: + return "SOFT_RESET"; + case FIT_SR_DRIVE_NEED_FW_DOWNLOAD: + return "NEED_FW"; + case FIT_SR_DRIVE_INIT_FAULT: + return "INIT_FAULT"; + case FIT_SR_DRIVE_BUSY_SANITIZE: + return "BUSY_SANITIZE"; + case FIT_SR_DRIVE_BUSY_ERASE: + return "BUSY_ERASE"; + case FIT_SR_DRIVE_FW_BOOTING: + return "FW_BOOTING"; + default: + return "???"; + } +} + +const char *skd_skdev_state_to_str(enum skd_drvr_state state) +{ + switch (state) { + case SKD_DRVR_STATE_LOAD: + return "LOAD"; + case SKD_DRVR_STATE_IDLE: + return "IDLE"; + case SKD_DRVR_STATE_BUSY: + return "BUSY"; + case SKD_DRVR_STATE_STARTING: + return "STARTING"; + case SKD_DRVR_STATE_ONLINE: + return "ONLINE"; + case SKD_DRVR_STATE_PAUSING: + return "PAUSING"; + case SKD_DRVR_STATE_PAUSED: + return "PAUSED"; + case SKD_DRVR_STATE_DRAINING_TIMEOUT: + return "DRAINING_TIMEOUT"; + case SKD_DRVR_STATE_RESTARTING: + return "RESTARTING"; + case SKD_DRVR_STATE_RESUMING: + return "RESUMING"; + case SKD_DRVR_STATE_STOPPING: + return "STOPPING"; + case SKD_DRVR_STATE_SYNCING: + return "SYNCING"; + case SKD_DRVR_STATE_FAULT: + return "FAULT"; + case SKD_DRVR_STATE_DISAPPEARED: + return "DISAPPEARED"; + case SKD_DRVR_STATE_BUSY_ERASE: + return "BUSY_ERASE"; + case SKD_DRVR_STATE_BUSY_SANITIZE: + return "BUSY_SANITIZE"; + case SKD_DRVR_STATE_BUSY_IMMINENT: + return "BUSY_IMMINENT"; + case SKD_DRVR_STATE_WAIT_BOOT: + return "WAIT_BOOT"; + + default: + return "???"; + } +} + +const char *skd_skmsg_state_to_str(enum skd_fit_msg_state state) +{ + switch (state) { + case SKD_MSG_STATE_IDLE: + return "IDLE"; + case SKD_MSG_STATE_BUSY: + return "BUSY"; + default: + return "???"; + } +} + +const char *skd_skreq_state_to_str(enum skd_req_state state) +{ + switch (state) { + case SKD_REQ_STATE_IDLE: + return "IDLE"; + case SKD_REQ_STATE_SETUP: + return "SETUP"; + case SKD_REQ_STATE_BUSY: + return "BUSY"; + case SKD_REQ_STATE_COMPLETED: + return "COMPLETED"; + case SKD_REQ_STATE_TIMEOUT: + return "TIMEOUT"; + case SKD_REQ_STATE_ABORTED: + return "ABORTED"; + default: + return "???"; + } +} + +static void skd_log_skdev(struct skd_device *skdev, const char *event) +{ + pr_debug("%s:%s:%d (%s) skdev=%p event='%s'\n", + skdev->name, __func__, __LINE__, skdev->name, skdev, event); + pr_debug("%s:%s:%d drive_state=%s(%d) driver_state=%s(%d)\n", + skdev->name, __func__, __LINE__, + skd_drive_state_to_str(skdev->drive_state), skdev->drive_state, + skd_skdev_state_to_str(skdev->state), skdev->state); + pr_debug("%s:%s:%d busy=%d limit=%d dev=%d lowat=%d\n", + skdev->name, __func__, __LINE__, + skdev->in_flight, skdev->cur_max_queue_depth, + skdev->dev_max_queue_depth, skdev->queue_low_water_mark); + pr_debug("%s:%s:%d timestamp=0x%x cycle=%d cycle_ix=%d\n", + skdev->name, __func__, __LINE__, + skdev->timeout_stamp, skdev->skcomp_cycle, skdev->skcomp_ix); +} + +static void skd_log_skmsg(struct skd_device *skdev, + struct skd_fitmsg_context *skmsg, const char *event) +{ + pr_debug("%s:%s:%d (%s) skmsg=%p event='%s'\n", + skdev->name, __func__, __LINE__, skdev->name, skmsg, event); + pr_debug("%s:%s:%d state=%s(%d) id=0x%04x length=%d\n", + skdev->name, __func__, __LINE__, + skd_skmsg_state_to_str(skmsg->state), skmsg->state, + skmsg->id, skmsg->length); +} + +static void skd_log_skreq(struct skd_device *skdev, + struct skd_request_context *skreq, const char *event) +{ + pr_debug("%s:%s:%d (%s) skreq=%p event='%s'\n", + skdev->name, __func__, __LINE__, skdev->name, skreq, event); + pr_debug("%s:%s:%d state=%s(%d) id=0x%04x fitmsg=0x%04x\n", + skdev->name, __func__, __LINE__, + skd_skreq_state_to_str(skreq->state), skreq->state, + skreq->id, skreq->fitmsg_id); + pr_debug("%s:%s:%d timo=0x%x sg_dir=%d n_sg=%d\n", + skdev->name, __func__, __LINE__, + skreq->timeout_stamp, skreq->sg_data_dir, skreq->n_sg); + + if (skreq->req != NULL) { + struct request *req = skreq->req; + u32 lba = (u32)blk_rq_pos(req); + u32 count = blk_rq_sectors(req); + + pr_debug("%s:%s:%d " + "req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", + skdev->name, __func__, __LINE__, + req, lba, lba, count, count, + (int)rq_data_dir(req)); + } else + pr_debug("%s:%s:%d req=NULL\n", + skdev->name, __func__, __LINE__); +} + +/* + ***************************************************************************** + * MODULE GLUE + ***************************************************************************** + */ + +static int __init skd_init(void) +{ + pr_info(PFX " v%s-b%s loaded\n", DRV_VERSION, DRV_BUILD_ID); + + switch (skd_isr_type) { + case SKD_IRQ_LEGACY: + case SKD_IRQ_MSI: + case SKD_IRQ_MSIX: + break; + default: + pr_err(PFX "skd_isr_type %d invalid, re-set to %d\n", + skd_isr_type, SKD_IRQ_DEFAULT); + skd_isr_type = SKD_IRQ_DEFAULT; + } + + if (skd_max_queue_depth < 1 || + skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) { + pr_err(PFX "skd_max_queue_depth %d invalid, re-set to %d\n", + skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT); + skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT; + } + + if (skd_max_req_per_msg < 1 || skd_max_req_per_msg > 14) { + pr_err(PFX "skd_max_req_per_msg %d invalid, re-set to %d\n", + skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT); + skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT; + } + + if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) { + pr_err(PFX "skd_sg_per_request %d invalid, re-set to %d\n", + skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT); + skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT; + } + + if (skd_dbg_level < 0 || skd_dbg_level > 2) { + pr_err(PFX "skd_dbg_level %d invalid, re-set to %d\n", + skd_dbg_level, 0); + skd_dbg_level = 0; + } + + if (skd_isr_comp_limit < 0) { + pr_err(PFX "skd_isr_comp_limit %d invalid, set to %d\n", + skd_isr_comp_limit, 0); + skd_isr_comp_limit = 0; + } + + if (skd_max_pass_thru < 1 || skd_max_pass_thru > 50) { + pr_err(PFX "skd_max_pass_thru %d invalid, re-set to %d\n", + skd_max_pass_thru, SKD_N_SPECIAL_CONTEXT); + skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT; + } + + return pci_register_driver(&skd_driver); +} + +static void __exit skd_exit(void) +{ + pr_info(PFX " v%s-b%s unloading\n", DRV_VERSION, DRV_BUILD_ID); + + pci_unregister_driver(&skd_driver); + + if (skd_major) + unregister_blkdev(skd_major, DRV_NAME); +} + +module_init(skd_init); +module_exit(skd_exit); |