diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/cciss.c | 72 | ||||
| -rw-r--r-- | drivers/ide/ide-io.c | 42 | ||||
| -rw-r--r-- | drivers/ide/ide-probe.c | 2 | ||||
| -rw-r--r-- | drivers/scsi/scsi.c | 109 | ||||
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 36 | ||||
| -rw-r--r-- | drivers/scsi/scsi_priv.h | 1 |
6 files changed, 128 insertions, 134 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 88452c79fb64..e4e9f255bd1f 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -2178,16 +2178,48 @@ static inline void resend_cciss_cmd( ctlr_info_t *h, CommandList_struct *c) start_io(h); } + +static void cciss_softirq_done(struct request *rq) +{ + CommandList_struct *cmd = rq->completion_data; + ctlr_info_t *h = hba[cmd->ctlr]; + u64bit temp64; + int i, ddir; + + if (cmd->Request.Type.Direction == XFER_READ) + ddir = PCI_DMA_FROMDEVICE; + else + ddir = PCI_DMA_TODEVICE; + + /* command did not need to be retried */ + /* unmap the DMA mapping for all the scatter gather elements */ + for(i=0; i<cmd->Header.SGList; i++) { + temp64.val32.lower = cmd->SG[i].Addr.lower; + temp64.val32.upper = cmd->SG[i].Addr.upper; + pci_unmap_page(h->pdev, temp64.val, cmd->SG[i].Len, ddir); + } + + complete_buffers(rq->bio, rq->errors); + +#ifdef CCISS_DEBUG + printk("Done with %p\n", rq); +#endif /* CCISS_DEBUG */ + + spin_lock_irq(&h->lock); + end_that_request_last(rq, rq->errors); + cmd_free(h, cmd,1); + spin_unlock_irq(&h->lock); +} + /* checks the status of the job and calls complete buffers to mark all - * buffers for the completed job. + * buffers for the completed job. Note that this function does not need + * to hold the hba/queue lock. */ static inline void complete_command( ctlr_info_t *h, CommandList_struct *cmd, int timeout) { int status = 1; - int i; int retry_cmd = 0; - u64bit temp64; if (timeout) status = 0; @@ -2295,24 +2327,10 @@ static inline void complete_command( ctlr_info_t *h, CommandList_struct *cmd, resend_cciss_cmd(h,cmd); return; } - /* command did not need to be retried */ - /* unmap the DMA mapping for all the scatter gather elements */ - for(i=0; i<cmd->Header.SGList; i++) { - temp64.val32.lower = cmd->SG[i].Addr.lower; - temp64.val32.upper = cmd->SG[i].Addr.upper; - pci_unmap_page(hba[cmd->ctlr]->pdev, - temp64.val, cmd->SG[i].Len, - (cmd->Request.Type.Direction == XFER_READ) ? - PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE); - } - complete_buffers(cmd->rq->bio, status); - -#ifdef CCISS_DEBUG - printk("Done with %p\n", cmd->rq); -#endif /* CCISS_DEBUG */ - end_that_request_last(cmd->rq, status ? 1 : -EIO); - cmd_free(h,cmd,1); + cmd->rq->completion_data = cmd; + cmd->rq->errors = status; + blk_complete_request(cmd->rq); } /* @@ -3199,15 +3217,17 @@ static int __devinit cciss_init_one(struct pci_dev *pdev, drv->queue = q; q->backing_dev_info.ra_pages = READ_AHEAD; - blk_queue_bounce_limit(q, hba[i]->pdev->dma_mask); + blk_queue_bounce_limit(q, hba[i]->pdev->dma_mask); + + /* This is a hardware imposed limit. */ + blk_queue_max_hw_segments(q, MAXSGENTRIES); - /* This is a hardware imposed limit. */ - blk_queue_max_hw_segments(q, MAXSGENTRIES); + /* This is a limit in the driver and could be eliminated. */ + blk_queue_max_phys_segments(q, MAXSGENTRIES); - /* This is a limit in the driver and could be eliminated. */ - blk_queue_max_phys_segments(q, MAXSGENTRIES); + blk_queue_max_sectors(q, 512); - blk_queue_max_sectors(q, 512); + blk_queue_softirq_done(q, cciss_softirq_done); q->queuedata = hba[i]; sprintf(disk->disk_name, "cciss/c%dd%d", i, j); diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c index b5dc6df8e67d..dea2d4dcc698 100644 --- a/drivers/ide/ide-io.c +++ b/drivers/ide/ide-io.c @@ -55,9 +55,22 @@ #include <asm/io.h> #include <asm/bitops.h> +void ide_softirq_done(struct request *rq) +{ + request_queue_t *q = rq->q; + + add_disk_randomness(rq->rq_disk); + end_that_request_chunk(rq, rq->errors, rq->data_len); + + spin_lock_irq(q->queue_lock); + end_that_request_last(rq, rq->errors); + spin_unlock_irq(q->queue_lock); +} + int __ide_end_request(ide_drive_t *drive, struct request *rq, int uptodate, int nr_sectors) { + unsigned int nbytes; int ret = 1; BUG_ON(!(rq->flags & REQ_STARTED)); @@ -81,17 +94,28 @@ int __ide_end_request(ide_drive_t *drive, struct request *rq, int uptodate, HWGROUP(drive)->hwif->ide_dma_on(drive); } - if (!end_that_request_first(rq, uptodate, nr_sectors)) { - add_disk_randomness(rq->rq_disk); - - if (blk_rq_tagged(rq)) - blk_queue_end_tag(drive->queue, rq); - + /* + * For partial completions (or non fs/pc requests), use the regular + * direct completion path. + */ + nbytes = nr_sectors << 9; + if (rq_all_done(rq, nbytes)) { + rq->errors = uptodate; + rq->data_len = nbytes; blkdev_dequeue_request(rq); HWGROUP(drive)->rq = NULL; - end_that_request_last(rq, uptodate); + blk_complete_request(rq); ret = 0; + } else { + if (!end_that_request_first(rq, uptodate, nr_sectors)) { + add_disk_randomness(rq->rq_disk); + blkdev_dequeue_request(rq); + HWGROUP(drive)->rq = NULL; + end_that_request_last(rq, uptodate); + ret = 0; + } } + return ret; } EXPORT_SYMBOL(__ide_end_request); @@ -113,6 +137,10 @@ int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) unsigned long flags; int ret = 1; + /* + * room for locking improvements here, the calls below don't + * need the queue lock held at all + */ spin_lock_irqsave(&ide_lock, flags); rq = HWGROUP(drive)->rq; diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c index 02167a5b751d..1ddaa71a8f45 100644 --- a/drivers/ide/ide-probe.c +++ b/drivers/ide/ide-probe.c @@ -1011,6 +1011,8 @@ static int ide_init_queue(ide_drive_t *drive) blk_queue_max_hw_segments(q, max_sg_entries); blk_queue_max_phys_segments(q, max_sg_entries); + blk_queue_softirq_done(q, ide_softirq_done); + /* assign drive queue */ drive->queue = q; diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 180676d7115a..ee5f4dfdab14 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -69,7 +69,6 @@ #include "scsi_logging.h" static void scsi_done(struct scsi_cmnd *cmd); -static int scsi_retry_command(struct scsi_cmnd *cmd); /* * Definitions and constants. @@ -752,7 +751,7 @@ static void scsi_done(struct scsi_cmnd *cmd) * isn't running --- used by scsi_times_out */ void __scsi_done(struct scsi_cmnd *cmd) { - unsigned long flags; + struct request *rq = cmd->request; /* * Set the serial numbers back to zero @@ -763,71 +762,14 @@ void __scsi_done(struct scsi_cmnd *cmd) if (cmd->result) atomic_inc(&cmd->device->ioerr_cnt); + BUG_ON(!rq); + /* - * Next, enqueue the command into the done queue. - * It is a per-CPU queue, so we just disable local interrupts - * and need no spinlock. + * The uptodate/nbytes values don't matter, as we allow partial + * completes and thus will check this in the softirq callback */ - local_irq_save(flags); - list_add_tail(&cmd->eh_entry, &__get_cpu_var(scsi_done_q)); - raise_softirq_irqoff(SCSI_SOFTIRQ); - local_irq_restore(flags); -} - -/** - * scsi_softirq - Perform post-interrupt processing of finished SCSI commands. - * - * This is the consumer of the done queue. - * - * This is called with all interrupts enabled. This should reduce - * interrupt latency, stack depth, and reentrancy of the low-level - * drivers. - */ -static void scsi_softirq(struct softirq_action *h) -{ - int disposition; - LIST_HEAD(local_q); - - local_irq_disable(); - list_splice_init(&__get_cpu_var(scsi_done_q), &local_q); - local_irq_enable(); - - while (!list_empty(&local_q)) { - struct scsi_cmnd *cmd = list_entry(local_q.next, - struct scsi_cmnd, eh_entry); - /* The longest time any command should be outstanding is the - * per command timeout multiplied by the number of retries. - * - * For a typical command, this is 2.5 minutes */ - unsigned long wait_for - = cmd->allowed * cmd->timeout_per_command; - list_del_init(&cmd->eh_entry); - - disposition = scsi_decide_disposition(cmd); - if (disposition != SUCCESS && - time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) { - sdev_printk(KERN_ERR, cmd->device, - "timing out command, waited %lus\n", - wait_for/HZ); - disposition = SUCCESS; - } - - scsi_log_completion(cmd, disposition); - switch (disposition) { - case SUCCESS: - scsi_finish_command(cmd); - break; - case NEEDS_RETRY: - scsi_retry_command(cmd); - break; - case ADD_TO_MLQUEUE: - scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY); - break; - default: - if (!scsi_eh_scmd_add(cmd, 0)) - scsi_finish_command(cmd); - } - } + rq->completion_data = cmd; + blk_complete_request(rq); } /* @@ -840,7 +782,7 @@ static void scsi_softirq(struct softirq_action *h) * level drivers should not become re-entrant as a result of * this. */ -static int scsi_retry_command(struct scsi_cmnd *cmd) +int scsi_retry_command(struct scsi_cmnd *cmd) { /* * Restore the SCSI command state. @@ -1273,38 +1215,6 @@ int scsi_device_cancel(struct scsi_device *sdev, int recovery) } EXPORT_SYMBOL(scsi_device_cancel); -#ifdef CONFIG_HOTPLUG_CPU -static int scsi_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) -{ - int cpu = (unsigned long)hcpu; - - switch(action) { - case CPU_DEAD: - /* Drain scsi_done_q. */ - local_irq_disable(); - list_splice_init(&per_cpu(scsi_done_q, cpu), - &__get_cpu_var(scsi_done_q)); - raise_softirq_irqoff(SCSI_SOFTIRQ); - local_irq_enable(); - break; - default: - break; - } - return NOTIFY_OK; -} - -static struct notifier_block __devinitdata scsi_cpu_nb = { - .notifier_call = scsi_cpu_notify, -}; - -#define register_scsi_cpu() register_cpu_notifier(&scsi_cpu_nb) -#define unregister_scsi_cpu() unregister_cpu_notifier(&scsi_cpu_nb) -#else -#define register_scsi_cpu() -#define unregister_scsi_cpu() -#endif /* CONFIG_HOTPLUG_CPU */ - MODULE_DESCRIPTION("SCSI core"); MODULE_LICENSE("GPL"); @@ -1338,8 +1248,6 @@ static int __init init_scsi(void) INIT_LIST_HEAD(&per_cpu(scsi_done_q, i)); devfs_mk_dir("scsi"); - open_softirq(SCSI_SOFTIRQ, scsi_softirq, NULL); - register_scsi_cpu(); printk(KERN_NOTICE "SCSI subsystem initialized\n"); return 0; @@ -1367,7 +1275,6 @@ static void __exit exit_scsi(void) devfs_remove("scsi"); scsi_exit_procfs(); scsi_exit_queue(); - unregister_scsi_cpu(); } subsys_initcall(init_scsi); diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index ba93d6e66d48..00c9bf383e23 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1493,6 +1493,41 @@ static void scsi_kill_request(struct request *req, request_queue_t *q) __scsi_done(cmd); } +static void scsi_softirq_done(struct request *rq) +{ + struct scsi_cmnd *cmd = rq->completion_data; + unsigned long wait_for = cmd->allowed * cmd->timeout_per_command; + int disposition; + + INIT_LIST_HEAD(&cmd->eh_entry); + + disposition = scsi_decide_disposition(cmd); + if (disposition != SUCCESS && + time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) { + sdev_printk(KERN_ERR, cmd->device, + "timing out command, waited %lus\n", + wait_for/HZ); + disposition = SUCCESS; + } + + scsi_log_completion(cmd, disposition); + + switch (disposition) { + case SUCCESS: + scsi_finish_command(cmd); + break; + case NEEDS_RETRY: + scsi_retry_command(cmd); + break; + case ADD_TO_MLQUEUE: + scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY); + break; + default: + if (!scsi_eh_scmd_add(cmd, 0)) + scsi_finish_command(cmd); + } +} + /* * Function: scsi_request_fn() * @@ -1667,6 +1702,7 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) 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); diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index f04e7e11f57a..14a6198cb8d2 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -44,6 +44,7 @@ extern void scsi_init_cmd_from_req(struct scsi_cmnd *cmd, struct scsi_request *sreq); extern void __scsi_release_request(struct scsi_request *sreq); extern void __scsi_done(struct scsi_cmnd *cmd); +extern int scsi_retry_command(struct scsi_cmnd *cmd); #ifdef CONFIG_SCSI_LOGGING void scsi_log_send(struct scsi_cmnd *cmd); void scsi_log_completion(struct scsi_cmnd *cmd, int disposition); |