diff options
Diffstat (limited to 'include/scsi/scsi_host.h')
| -rw-r--r-- | include/scsi/scsi_host.h | 68 |
1 files changed, 27 insertions, 41 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 94844fc77b97..ba2034779961 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -7,6 +7,7 @@ #include <linux/workqueue.h> #include <linux/mutex.h> #include <linux/seq_file.h> +#include <linux/blk-mq.h> #include <scsi/scsi.h> struct request_queue; @@ -132,27 +133,6 @@ struct scsi_host_template { int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *); /* - * The transfer functions are used to queue a scsi command to - * the LLD. When the driver is finished processing the command - * the done callback is invoked. - * - * This is called to inform the LLD to transfer - * scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the - * number of scatterlist entried in the command and - * scsi_sglist(cmd) returns the scatterlist. - * - * return values: see queuecommand - * - * If the LLD accepts the cmd, it should set the result to an - * appropriate value when completed before calling the done function. - * - * STATUS: REQUIRED FOR TARGET DRIVERS - */ - /* TODO: rename */ - int (* transfer_response)(struct scsi_cmnd *, - void (*done)(struct scsi_cmnd *)); - - /* * This is an error handling strategy routine. You don't need to * define one of these if you don't want to - there is a default * routine that is present that should work in most cases. For those @@ -408,7 +388,7 @@ struct scsi_host_template { /* * Set this if the host adapter has limitations beside segment count. */ - unsigned short max_sectors; + unsigned int max_sectors; /* * DMA scatter gather segment boundary limit. A segment crossing this @@ -531,6 +511,9 @@ struct scsi_host_template { */ unsigned int cmd_size; struct scsi_host_cmd_pool *cmd_pool; + + /* temporary flag to disable blk-mq I/O path */ + bool disable_blk_mq; }; /* @@ -601,15 +584,16 @@ struct Scsi_Host { * Area to keep a shared tag map (if needed, will be * NULL if not). */ - struct blk_queue_tag *bqt; + union { + struct blk_queue_tag *bqt; + struct blk_mq_tag_set tag_set; + }; - /* - * The following two fields are protected with host_lock; - * however, eh routines can safely access during eh processing - * without acquiring the lock. - */ - unsigned int host_busy; /* commands actually active on low-level */ - unsigned int host_failed; /* commands that failed. */ + atomic_t host_busy; /* commands actually active on low-level */ + atomic_t host_blocked; + + unsigned int host_failed; /* commands that failed. + protected by host_lock */ unsigned int host_eh_scheduled; /* EH scheduled without command */ unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ @@ -623,11 +607,11 @@ struct Scsi_Host { * These three parameters can be used to allow for wide scsi, * and for host adapters that support multiple busses * The first two should be set to 1 more than the actual max id - * or lun (i.e. 8 for normal systems). + * or lun (e.g. 8 for SCSI parallel systems). */ - unsigned int max_id; - unsigned int max_lun; unsigned int max_channel; + unsigned int max_id; + u64 max_lun; /* * This is a unique identifier that must be assigned so that we @@ -652,7 +636,7 @@ struct Scsi_Host { short cmd_per_lun; short unsigned int sg_tablesize; short unsigned int sg_prot_tablesize; - short unsigned int max_sectors; + unsigned int max_sectors; unsigned long dma_boundary; /* * Used to assign serial numbers to the cmds. @@ -695,6 +679,8 @@ struct Scsi_Host { /* The controller does not support WRITE SAME */ unsigned no_write_same:1; + unsigned use_blk_mq:1; + /* * Optional work queue to be utilized by the transport */ @@ -707,11 +693,6 @@ struct Scsi_Host { struct workqueue_struct *tmf_work_q; /* - * Host has rejected a command because it was busy. - */ - unsigned int host_blocked; - - /* * Value host_blocked counts down from */ unsigned int max_host_blocked; @@ -800,6 +781,13 @@ static inline int scsi_host_in_recovery(struct Scsi_Host *shost) shost->tmf_in_progress; } +extern bool scsi_use_blk_mq; + +static inline bool shost_use_blk_mq(struct Scsi_Host *shost) +{ + return shost->use_blk_mq; +} + extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); extern void scsi_flush_work(struct Scsi_Host *); @@ -816,8 +804,6 @@ extern struct Scsi_Host *scsi_host_lookup(unsigned short); extern const char *scsi_host_state_name(enum scsi_host_state); extern void scsi_cmd_get_serial(struct Scsi_Host *, struct scsi_cmnd *); -extern u64 scsi_calculate_bounce_limit(struct Scsi_Host *); - static inline int __must_check scsi_add_host(struct Scsi_Host *host, struct device *dev) { |