diff options
| -rw-r--r-- | drivers/scsi/hosts.c | 4 | ||||
| -rw-r--r-- | drivers/scsi/scsi.c | 43 | ||||
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 33 | ||||
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 10 | ||||
| -rw-r--r-- | include/scsi/scsi_host.h | 43 |
5 files changed, 107 insertions, 26 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 2ffdc9e0532d..38c3a291efac 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -263,6 +263,10 @@ static void scsi_host_dev_release(struct device *dev) kthread_stop(shost->ehandler); if (shost->work_q) destroy_workqueue(shost->work_q); + if (shost->uspace_req_q) { + kfree(shost->uspace_req_q->queuedata); + scsi_free_queue(shost->uspace_req_q); + } scsi_destroy_command_freelist(shost); if (shost->bqt) diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 780d6dc92b42..fafc00deaade 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -156,8 +156,7 @@ static struct scsi_host_cmd_pool scsi_cmd_dma_pool = { static DEFINE_MUTEX(host_cmd_pool_mutex); -static struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, - gfp_t gfp_mask) +struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask) { struct scsi_cmnd *cmd; @@ -178,6 +177,7 @@ static struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, return cmd; } +EXPORT_SYMBOL_GPL(__scsi_get_command); /* * Function: scsi_get_command() @@ -214,9 +214,29 @@ struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask) put_device(&dev->sdev_gendev); return cmd; -} +} EXPORT_SYMBOL(scsi_get_command); +void __scsi_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd, + struct device *dev) +{ + unsigned long flags; + + /* changing locks here, don't need to restore the irq state */ + spin_lock_irqsave(&shost->free_list_lock, flags); + if (unlikely(list_empty(&shost->free_list))) { + list_add(&cmd->list, &shost->free_list); + cmd = NULL; + } + spin_unlock_irqrestore(&shost->free_list_lock, flags); + + if (likely(cmd != NULL)) + kmem_cache_free(shost->cmd_pool->slab, cmd); + + put_device(dev); +} +EXPORT_SYMBOL(__scsi_put_command); + /* * Function: scsi_put_command() * @@ -231,26 +251,15 @@ EXPORT_SYMBOL(scsi_get_command); void scsi_put_command(struct scsi_cmnd *cmd) { struct scsi_device *sdev = cmd->device; - struct Scsi_Host *shost = sdev->host; unsigned long flags; - + /* serious error if the command hasn't come from a device list */ spin_lock_irqsave(&cmd->device->list_lock, flags); BUG_ON(list_empty(&cmd->list)); list_del_init(&cmd->list); - spin_unlock(&cmd->device->list_lock); - /* changing locks here, don't need to restore the irq state */ - spin_lock(&shost->free_list_lock); - if (unlikely(list_empty(&shost->free_list))) { - list_add(&cmd->list, &shost->free_list); - cmd = NULL; - } - spin_unlock_irqrestore(&shost->free_list_lock, flags); + spin_unlock_irqrestore(&cmd->device->list_lock, flags); - if (likely(cmd != NULL)) - kmem_cache_free(shost->cmd_pool->slab, cmd); - - put_device(&sdev->sdev_gendev); + __scsi_put_command(cmd->device->host, cmd, &sdev->sdev_gendev); } EXPORT_SYMBOL(scsi_put_command); diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 2f12f9f12fcb..fb616c69151f 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -704,7 +704,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int uptodate, return NULL; } -static struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask) +struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask) { struct scsi_host_sg_pool *sgp; struct scatterlist *sgl; @@ -745,7 +745,9 @@ static struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_m return sgl; } -static void scsi_free_sgtable(struct scatterlist *sgl, int index) +EXPORT_SYMBOL(scsi_alloc_sgtable); + +void scsi_free_sgtable(struct scatterlist *sgl, int index) { struct scsi_host_sg_pool *sgp; @@ -755,6 +757,8 @@ static void scsi_free_sgtable(struct scatterlist *sgl, int index) mempool_free(sgl, sgp->pool); } +EXPORT_SYMBOL(scsi_free_sgtable); + /* * Function: scsi_release_buffers() * @@ -1567,29 +1571,40 @@ u64 scsi_calculate_bounce_limit(struct Scsi_Host *shost) } EXPORT_SYMBOL(scsi_calculate_bounce_limit); -struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) +struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, + request_fn_proc *request_fn) { - struct Scsi_Host *shost = sdev->host; struct request_queue *q; - q = blk_init_queue(scsi_request_fn, NULL); + q = blk_init_queue(request_fn, NULL); if (!q) return NULL; - blk_queue_prep_rq(q, scsi_prep_fn); - blk_queue_max_hw_segments(q, shost->sg_tablesize); blk_queue_max_phys_segments(q, SCSI_MAX_PHYS_SEGMENTS); blk_queue_max_sectors(q, shost->max_sectors); blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost)); blk_queue_segment_boundary(q, shost->dma_boundary); - blk_queue_issue_flush_fn(q, scsi_issue_flush_fn); - blk_queue_softirq_done(q, scsi_softirq_done); if (!shost->use_clustering) clear_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags); return q; } +EXPORT_SYMBOL(__scsi_alloc_queue); + +struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) +{ + struct request_queue *q; + + q = __scsi_alloc_queue(sdev->host, scsi_request_fn); + if (!q) + return NULL; + + blk_queue_prep_rq(q, scsi_prep_fn); + blk_queue_issue_flush_fn(q, scsi_issue_flush_fn); + blk_queue_softirq_done(q, scsi_softirq_done); + return q; +} void scsi_free_queue(struct request_queue *q) { diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index be117f812deb..d6948d0e8cdb 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -8,6 +8,7 @@ struct request; struct scatterlist; +struct Scsi_Host; struct scsi_device; @@ -72,6 +73,9 @@ struct scsi_cmnd { unsigned short use_sg; /* Number of pieces of scatter-gather */ unsigned short sglist_len; /* size of malloc'd scatter-gather list */ + /* offset in cmd we are at (for multi-transfer tgt cmds) */ + unsigned offset; + unsigned underflow; /* Return error if less than this amount is transferred */ @@ -119,7 +123,10 @@ struct scsi_cmnd { }; extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); +extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t); extern void scsi_put_command(struct scsi_cmnd *); +extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *, + struct device *); extern void scsi_io_completion(struct scsi_cmnd *, unsigned int); extern void scsi_finish_command(struct scsi_cmnd *cmd); extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); @@ -128,4 +135,7 @@ extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, size_t *offset, size_t *len); extern void scsi_kunmap_atomic_sg(void *virt); +extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t); +extern void scsi_free_sgtable(struct scatterlist *, int); + #endif /* _SCSI_SCSI_CMND_H */ diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 6d8945d71c65..7f1f411d07af 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> +struct request_queue; struct block_device; struct completion; struct module; @@ -124,6 +125,39 @@ struct scsi_host_template { void (*done)(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. + * + * 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 called to inform the LLD to transfer cmd->request_bufflen + * bytes of the cmd at cmd->offset in the cmd. The cmd->use_sg + * speciefies the number of scatterlist entried in the command + * and cmd->request_buffer contains the scatterlist. + * + * If the command cannot be processed in one transfer_data call + * becuase a scatterlist within the LLD's limits cannot be + * created then transfer_data will be called multiple times. + * It is initially called from process context, and later + * calls are from the interrup context. + */ + int (* transfer_data)(struct scsi_cmnd *, + void (*done)(struct scsi_cmnd *)); + + /* Used as callback for the completion of task management request. */ + int (* tsk_mgmt_response)(u64 mid, int result); + + /* * 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 @@ -589,6 +623,12 @@ struct Scsi_Host { */ unsigned int max_host_blocked; + /* + * q used for scsi_tgt msgs, async events or any other requests that + * need to be processed in userspace + */ + struct request_queue *uspace_req_q; + /* legacy crap */ unsigned long base; unsigned long io_port; @@ -687,6 +727,9 @@ extern void scsi_unblock_requests(struct Scsi_Host *); extern void scsi_block_requests(struct Scsi_Host *); struct class_container; + +extern struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, + void (*) (struct request_queue *)); /* * These two functions are used to allocate and free a pseudo device * which will connect to the host adapter itself rather than any |