diff options
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/libsas/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/scsi/libsas/Makefile | 1 | ||||
| -rw-r--r-- | drivers/scsi/libsas/sas_expander.c | 8 | ||||
| -rw-r--r-- | drivers/scsi/libsas/sas_host_smp.c | 274 | ||||
| -rw-r--r-- | drivers/scsi/libsas/sas_internal.h | 14 |
5 files changed, 301 insertions, 5 deletions
diff --git a/drivers/scsi/libsas/Kconfig b/drivers/scsi/libsas/Kconfig index c01a40d321d4..18f33cd54411 100644 --- a/drivers/scsi/libsas/Kconfig +++ b/drivers/scsi/libsas/Kconfig @@ -38,6 +38,15 @@ config SCSI_SAS_ATA Builds in ATA support into libsas. Will necessitate the loading of libata along with libsas. +config SCSI_SAS_HOST_SMP + bool "Support for SMP interpretation for SAS hosts" + default y + depends on SCSI_SAS_LIBSAS + help + Allows sas hosts to receive SMP frames. Selecting this + option builds an SMP interpreter into libsas. Say + N here if you want to save the few kb this consumes. + config SCSI_SAS_LIBSAS_DEBUG bool "Compile the SAS Domain Transport Attributes in debug mode" default y diff --git a/drivers/scsi/libsas/Makefile b/drivers/scsi/libsas/Makefile index fd387b91856e..60d6e93dd949 100644 --- a/drivers/scsi/libsas/Makefile +++ b/drivers/scsi/libsas/Makefile @@ -35,3 +35,4 @@ libsas-y += sas_init.o \ sas_expander.o \ sas_scsi_host.o libsas-$(CONFIG_SCSI_SAS_ATA) += sas_ata.o +libsas-$(CONFIG_SCSI_SAS_HOST_SMP) += sas_host_smp.o
\ No newline at end of file diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index 27674fe468f5..76555b1ddfd5 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -1896,11 +1896,9 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy, } /* no rphy means no smp target support (ie aic94xx host) */ - if (!rphy) { - printk("%s: can we send a smp request to a host?\n", - __FUNCTION__); - return -EINVAL; - } + if (!rphy) + return sas_smp_host_handler(shost, req, rsp); + type = rphy->identify.device_type; if (type != SAS_EDGE_EXPANDER_DEVICE && diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c new file mode 100644 index 000000000000..16f93123271e --- /dev/null +++ b/drivers/scsi/libsas/sas_host_smp.c @@ -0,0 +1,274 @@ +/* + * Serial Attached SCSI (SAS) Expander discovery and configuration + * + * Copyright (C) 2007 James E.J. Bottomley + * <James.Bottomley@HansenPartnership.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; version 2 only. + */ +#include <linux/scatterlist.h> +#include <linux/blkdev.h> + +#include "sas_internal.h" + +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_sas.h> +#include "../scsi_sas_internal.h" + +static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data, + u8 phy_id) +{ + struct sas_phy *phy; + struct sas_rphy *rphy; + + if (phy_id >= sas_ha->num_phys) { + resp_data[2] = SMP_RESP_NO_PHY; + return; + } + resp_data[2] = SMP_RESP_FUNC_ACC; + + phy = sas_ha->sas_phy[phy_id]->phy; + resp_data[9] = phy_id; + resp_data[13] = phy->negotiated_linkrate; + memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE); + memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr, + SAS_ADDR_SIZE); + resp_data[40] = (phy->minimum_linkrate << 4) | + phy->minimum_linkrate_hw; + resp_data[41] = (phy->maximum_linkrate << 4) | + phy->maximum_linkrate_hw; + + if (!sas_ha->sas_phy[phy_id]->port || + !sas_ha->sas_phy[phy_id]->port->port_dev) + return; + + rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; + resp_data[12] = rphy->identify.device_type << 4; + resp_data[14] = rphy->identify.initiator_port_protocols; + resp_data[15] = rphy->identify.target_port_protocols; +} + +static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data, + u8 phy_id) +{ + struct sas_rphy *rphy; + struct dev_to_host_fis *fis; + int i; + + if (phy_id >= sas_ha->num_phys) { + resp_data[2] = SMP_RESP_NO_PHY; + return; + } + + resp_data[2] = SMP_RESP_PHY_NO_SATA; + + if (!sas_ha->sas_phy[phy_id]->port) + return; + + rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; + fis = (struct dev_to_host_fis *) + sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd; + if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA) + return; + + resp_data[2] = SMP_RESP_FUNC_ACC; + resp_data[9] = phy_id; + memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr, + SAS_ADDR_SIZE); + + /* check to see if we have a valid d2h fis */ + if (fis->fis_type != 0x34) + return; + + /* the d2h fis is required by the standard to be in LE format */ + for (i = 0; i < 20; i += 4) { + u8 *dst = resp_data + 24 + i, *src = + &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i]; + dst[0] = src[3]; + dst[1] = src[2]; + dst[2] = src[1]; + dst[3] = src[0]; + } +} + +static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id, + u8 phy_op, enum sas_linkrate min, + enum sas_linkrate max, u8 *resp_data) +{ + struct sas_internal *i = + to_sas_internal(sas_ha->core.shost->transportt); + struct sas_phy_linkrates rates; + + if (phy_id >= sas_ha->num_phys) { + resp_data[2] = SMP_RESP_NO_PHY; + return; + } + switch (phy_op) { + case PHY_FUNC_NOP: + case PHY_FUNC_LINK_RESET: + case PHY_FUNC_HARD_RESET: + case PHY_FUNC_DISABLE: + case PHY_FUNC_CLEAR_ERROR_LOG: + case PHY_FUNC_CLEAR_AFFIL: + case PHY_FUNC_TX_SATA_PS_SIGNAL: + break; + + default: + resp_data[2] = SMP_RESP_PHY_UNK_OP; + return; + } + + rates.minimum_linkrate = min; + rates.maximum_linkrate = max; + + if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates)) + resp_data[2] = SMP_RESP_FUNC_FAILED; + else + resp_data[2] = SMP_RESP_FUNC_ACC; +} + +int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req, + struct request *rsp) +{ + u8 *req_data = NULL, *resp_data = NULL, *buf; + struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); + int error = -EINVAL, resp_data_len = rsp->data_len; + + /* eight is the minimum size for request and response frames */ + if (req->data_len < 8 || rsp->data_len < 8) + goto out; + + if (bio_offset(req->bio) + req->data_len > PAGE_SIZE || + bio_offset(rsp->bio) + rsp->data_len > PAGE_SIZE) { + shost_printk(KERN_ERR, shost, + "SMP request/response frame crosses page boundary"); + goto out; + } + + req_data = kzalloc(req->data_len, GFP_KERNEL); + + /* make sure frame can always be built ... we copy + * back only the requested length */ + resp_data = kzalloc(max(rsp->data_len, 128U), GFP_KERNEL); + + if (!req_data || !resp_data) { + error = -ENOMEM; + goto out; + } + + local_irq_disable(); + buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio); + memcpy(req_data, buf, req->data_len); + kunmap_atomic(buf - bio_offset(req->bio), KM_USER0); + local_irq_enable(); + + if (req_data[0] != SMP_REQUEST) + goto out; + + /* always succeeds ... even if we can't process the request + * the result is in the response frame */ + error = 0; + + /* set up default don't know response */ + resp_data[0] = SMP_RESPONSE; + resp_data[1] = req_data[1]; + resp_data[2] = SMP_RESP_FUNC_UNK; + + switch (req_data[1]) { + case SMP_REPORT_GENERAL: + req->data_len -= 8; + resp_data_len -= 32; + resp_data[2] = SMP_RESP_FUNC_ACC; + resp_data[9] = sas_ha->num_phys; + break; + + case SMP_REPORT_MANUF_INFO: + req->data_len -= 8; + resp_data_len -= 64; + resp_data[2] = SMP_RESP_FUNC_ACC; + memcpy(resp_data + 12, shost->hostt->name, + SAS_EXPANDER_VENDOR_ID_LEN); + memcpy(resp_data + 20, "libsas virt phy", + SAS_EXPANDER_PRODUCT_ID_LEN); + break; + + case SMP_READ_GPIO_REG: + /* FIXME: need GPIO support in the transport class */ + break; + + case SMP_DISCOVER: + req->data_len =- 16; + if (req->data_len < 0) { + req->data_len = 0; + error = -EINVAL; + goto out; + } + resp_data_len -= 56; + sas_host_smp_discover(sas_ha, resp_data, req_data[9]); + break; + + case SMP_REPORT_PHY_ERR_LOG: + /* FIXME: could implement this with additional + * libsas callbacks providing the HW supports it */ + break; + + case SMP_REPORT_PHY_SATA: + req->data_len =- 16; + if (req->data_len < 0) { + req->data_len = 0; + error = -EINVAL; + goto out; + } + resp_data_len -= 60; + sas_report_phy_sata(sas_ha, resp_data, req_data[9]); + break; + + case SMP_REPORT_ROUTE_INFO: + /* Can't implement; hosts have no routes */ + break; + + case SMP_WRITE_GPIO_REG: + /* FIXME: need GPIO support in the transport class */ + break; + + case SMP_CONF_ROUTE_INFO: + /* Can't implement; hosts have no routes */ + break; + + case SMP_PHY_CONTROL: + req->data_len =- 44; + if (req->data_len < 0) { + req->data_len = 0; + error = -EINVAL; + goto out; + } + resp_data_len -= 8; + sas_phy_control(sas_ha, req_data[9], req_data[10], + req_data[32] >> 4, req_data[33] >> 4, + resp_data); + break; + + case SMP_PHY_TEST_FUNCTION: + /* FIXME: should this be implemented? */ + break; + + default: + /* probably a 2.0 function */ + break; + } + + local_irq_disable(); + buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio); + memcpy(buf, resp_data, rsp->data_len); + flush_kernel_dcache_page(bio_page(rsp->bio)); + kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0); + local_irq_enable(); + rsp->data_len = resp_data_len; + + out: + kfree(req_data); + kfree(resp_data); + return error; +} diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h index baa0666ffa80..b4f9368f116a 100644 --- a/drivers/scsi/libsas/sas_internal.h +++ b/drivers/scsi/libsas/sas_internal.h @@ -80,6 +80,20 @@ struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy); void sas_hae_reset(struct work_struct *work); +#ifdef CONFIG_SCSI_SAS_HOST_SMP +extern int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req, + struct request *rsp); +#else +static inline int sas_smp_host_handler(struct Scsi_Host *shost, + struct request *req, + struct request *rsp) +{ + shost_printk(KERN_ERR, shost, + "Cannot send SMP to a sas host (not enabled in CONFIG)\n"); + return -EINVAL; +} +#endif + static inline void sas_queue_event(int event, spinlock_t *lock, unsigned long *pending, struct work_struct *work, |