diff options
Diffstat (limited to 'include/scsi/scsi_host.h')
| -rw-r--r-- | include/scsi/scsi_host.h | 43 |
1 files changed, 43 insertions, 0 deletions
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 |