#include <linux/delay.h>
#include <linux/init.h>
#include <linux/completion.h>
-#include <linux/devfs_fs_kernel.h>
#include <linux/unistd.h>
#include <linux/spinlock.h>
#include <linux/kmod.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
+#include <linux/mutex.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
-#include <scsi/scsi_request.h>
#include "scsi_priv.h"
#include "scsi_logging.h"
static void scsi_done(struct scsi_cmnd *cmd);
-static int scsi_retry_command(struct scsi_cmnd *cmd);
/*
* Definitions and constants.
};
EXPORT_SYMBOL(scsi_device_types);
-/*
- * Function: scsi_allocate_request
- *
- * Purpose: Allocate a request descriptor.
- *
- * Arguments: device - device for which we want a request
- * gfp_mask - allocation flags passed to kmalloc
- *
- * Lock status: No locks assumed to be held. This function is SMP-safe.
- *
- * Returns: Pointer to request block.
- */
-struct scsi_request *scsi_allocate_request(struct scsi_device *sdev,
- int gfp_mask)
-{
- const int offset = ALIGN(sizeof(struct scsi_request), 4);
- const int size = offset + sizeof(struct request);
- struct scsi_request *sreq;
-
- sreq = kmalloc(size, gfp_mask);
- if (likely(sreq != NULL)) {
- memset(sreq, 0, size);
- sreq->sr_request = (struct request *)(((char *)sreq) + offset);
- sreq->sr_device = sdev;
- sreq->sr_host = sdev->host;
- sreq->sr_magic = SCSI_REQ_MAGIC;
- sreq->sr_data_direction = DMA_BIDIRECTIONAL;
- }
-
- return sreq;
-}
-EXPORT_SYMBOL(scsi_allocate_request);
-
-void __scsi_release_request(struct scsi_request *sreq)
-{
- struct request *req = sreq->sr_request;
-
- /* unlikely because the tag was usually ended earlier by the
- * mid-layer. However, for layering reasons ULD's don't end
- * the tag of commands they generate. */
- if (unlikely(blk_rq_tagged(req))) {
- unsigned long flags;
- struct request_queue *q = req->q;
-
- spin_lock_irqsave(q->queue_lock, flags);
- blk_queue_end_tag(q, req);
- spin_unlock_irqrestore(q->queue_lock, flags);
- }
-
-
- if (likely(sreq->sr_command != NULL)) {
- struct scsi_cmnd *cmd = sreq->sr_command;
-
- sreq->sr_command = NULL;
- scsi_next_command(cmd);
- }
-}
-
-/*
- * Function: scsi_release_request
- *
- * Purpose: Release a request descriptor.
- *
- * Arguments: sreq - request to release
- *
- * Lock status: No locks assumed to be held. This function is SMP-safe.
- */
-void scsi_release_request(struct scsi_request *sreq)
-{
- __scsi_release_request(sreq);
- kfree(sreq);
-}
-EXPORT_SYMBOL(scsi_release_request);
-
struct scsi_host_cmd_pool {
kmem_cache_t *slab;
unsigned int users;
char *name;
unsigned int slab_flags;
- unsigned int gfp_mask;
+ gfp_t gfp_mask;
};
static struct scsi_host_cmd_pool scsi_cmd_pool = {
.gfp_mask = __GFP_DMA,
};
-static DECLARE_MUTEX(host_cmd_pool_mutex);
+static DEFINE_MUTEX(host_cmd_pool_mutex);
static struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost,
- int gfp_mask)
+ gfp_t gfp_mask)
{
struct scsi_cmnd *cmd;
*
* Returns: The allocated scsi command structure.
*/
-struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, int gfp_mask)
+struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask)
{
struct scsi_cmnd *cmd;
spin_lock_irqsave(&dev->list_lock, flags);
list_add_tail(&cmd->list, &dev->cmd_list);
spin_unlock_irqrestore(&dev->list_lock, flags);
+ cmd->jiffies_at_alloc = jiffies;
} else
put_device(&dev->sdev_gendev);
* Select a command slab for this host and create it if not
* yet existant.
*/
- down(&host_cmd_pool_mutex);
+ mutex_lock(&host_cmd_pool_mutex);
pool = (shost->unchecked_isa_dma ? &scsi_cmd_dma_pool : &scsi_cmd_pool);
if (!pool->users) {
pool->slab = kmem_cache_create(pool->name,
pool->users++;
shost->cmd_pool = pool;
- up(&host_cmd_pool_mutex);
+ mutex_unlock(&host_cmd_pool_mutex);
/*
* Get one backup command for this host.
kmem_cache_destroy(pool->slab);
return -ENOMEM;
fail:
- up(&host_cmd_pool_mutex);
+ mutex_unlock(&host_cmd_pool_mutex);
return -ENOMEM;
}
kmem_cache_free(shost->cmd_pool->slab, cmd);
}
- down(&host_cmd_pool_mutex);
+ mutex_lock(&host_cmd_pool_mutex);
if (!--shost->cmd_pool->users)
kmem_cache_destroy(shost->cmd_pool->slab);
- up(&host_cmd_pool_mutex);
+ mutex_unlock(&host_cmd_pool_mutex);
}
#ifdef CONFIG_SCSI_LOGGING
SCSI_LOG_MLQUEUE_BITS);
if (level > 1) {
sdev = cmd->device;
- printk(KERN_INFO "scsi <%d:%d:%d:%d> send ",
- sdev->host->host_no, sdev->channel, sdev->id,
- sdev->lun);
+ sdev_printk(KERN_INFO, sdev, "send ");
if (level > 2)
printk("0x%p ", cmd);
/*
if (((level > 0) && (cmd->result || disposition != SUCCESS)) ||
(level > 1)) {
sdev = cmd->device;
- printk(KERN_INFO "scsi <%d:%d:%d:%d> done ",
- sdev->host->host_no, sdev->channel, sdev->id,
- sdev->lun);
+ sdev_printk(KERN_INFO, sdev, "done ");
if (level > 2)
printk("0x%p ", cmd);
/*
/*
* If SCSI-2 or lower, store the LUN value in cmnd.
*/
- if (cmd->device->scsi_level <= SCSI_2) {
+ if (cmd->device->scsi_level <= SCSI_2 &&
+ cmd->device->scsi_level != SCSI_UNKNOWN) {
cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) |
(cmd->device->lun << 5 & 0xe0);
}
return rtn;
}
-/*
- * Function: scsi_init_cmd_from_req
- *
- * Purpose: Queue a SCSI command
- * Purpose: Initialize a struct scsi_cmnd from a struct scsi_request
- *
- * Arguments: cmd - command descriptor.
- * sreq - Request from the queue.
- *
- * Lock status: None needed.
- *
- * Returns: Nothing.
- *
- * Notes: Mainly transfer data from the request structure to the
- * command structure. The request structure is allocated
- * using the normal memory allocator, and requests can pile
- * up to more or less any depth. The command structure represents
- * a consumable resource, as these are allocated into a pool
- * when the SCSI subsystem initializes. The preallocation is
- * required so that in low-memory situations a disk I/O request
- * won't cause the memory manager to try and write out a page.
- * The request structure is generally used by ioctls and character
- * devices.
- */
-void scsi_init_cmd_from_req(struct scsi_cmnd *cmd, struct scsi_request *sreq)
-{
- sreq->sr_command = cmd;
-
- cmd->cmd_len = sreq->sr_cmd_len;
- cmd->use_sg = sreq->sr_use_sg;
-
- cmd->request = sreq->sr_request;
- memcpy(cmd->data_cmnd, sreq->sr_cmnd, sizeof(cmd->data_cmnd));
- cmd->serial_number = 0;
- cmd->bufflen = sreq->sr_bufflen;
- cmd->buffer = sreq->sr_buffer;
- cmd->retries = 0;
- cmd->allowed = sreq->sr_allowed;
- cmd->done = sreq->sr_done;
- cmd->timeout_per_command = sreq->sr_timeout_per_command;
- cmd->sc_data_direction = sreq->sr_data_direction;
- cmd->sglist_len = sreq->sr_sglist_len;
- cmd->underflow = sreq->sr_underflow;
- cmd->sc_request = sreq;
- memcpy(cmd->cmnd, sreq->sr_cmnd, sizeof(sreq->sr_cmnd));
-
- /*
- * Zero the sense buffer. Some host adapters automatically request
- * sense on error. 0 is not a valid sense code.
- */
- memset(cmd->sense_buffer, 0, sizeof(sreq->sr_sense_buffer));
- cmd->request_buffer = sreq->sr_buffer;
- cmd->request_bufflen = sreq->sr_bufflen;
- cmd->old_use_sg = cmd->use_sg;
- if (cmd->cmd_len == 0)
- cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
- cmd->old_cmd_len = cmd->cmd_len;
- cmd->sc_old_data_direction = cmd->sc_data_direction;
- cmd->old_underflow = cmd->underflow;
-
- /*
- * Start the timer ticking.
- */
- cmd->result = 0;
-
- SCSI_LOG_MLQUEUE(3, printk("Leaving scsi_init_cmd_from_req()\n"));
-}
/*
* Per-CPU I/O completion queue.
static DEFINE_PER_CPU(struct list_head, scsi_done_q);
/**
+ * scsi_req_abort_cmd -- Request command recovery for the specified command
+ * cmd: pointer to the SCSI command of interest
+ *
+ * This function requests that SCSI Core start recovery for the
+ * command by deleting the timer and adding the command to the eh
+ * queue. It can be called by either LLDDs or SCSI Core. LLDDs who
+ * implement their own error recovery MAY ignore the timeout event if
+ * they generated scsi_req_abort_cmd.
+ */
+void scsi_req_abort_cmd(struct scsi_cmnd *cmd)
+{
+ if (!scsi_delete_timer(cmd))
+ return;
+ scsi_times_out(cmd);
+}
+EXPORT_SYMBOL(scsi_req_abort_cmd);
+
+/**
* scsi_done - Enqueue the finished SCSI command into the done queue.
* @cmd: The SCSI Command for which a low-level device driver (LLDD) gives
* ownership back to SCSI Core -- i.e. the LLDD has finished with it.
* 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
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);
- list_del_init(&cmd->eh_entry);
-
- disposition = scsi_decide_disposition(cmd);
- 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);
}
/*
* 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.
{
struct scsi_device *sdev = cmd->device;
struct Scsi_Host *shost = sdev->host;
- struct scsi_request *sreq;
scsi_device_unbusy(sdev);
if (SCSI_SENSE_VALID(cmd))
cmd->result |= (DRIVER_SENSE << 24);
- SCSI_LOG_MLCOMPLETE(4, printk("Notifying upper driver of completion "
- "for device %d %x\n", sdev->id, cmd->result));
+ SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev,
+ "Notifying upper driver of completion "
+ "(result %x)\n", cmd->result));
/*
* We can get here with use_sg=0, causing a panic in the upper level
*/
cmd->use_sg = cmd->old_use_sg;
-
- /*
- * If there is an associated request structure, copy the data over
- * before we call the completion function.
- */
- sreq = cmd->sc_request;
- if (sreq) {
- sreq->sr_result = sreq->sr_command->result;
- if (sreq->sr_result) {
- memcpy(sreq->sr_sense_buffer,
- sreq->sr_command->sense_buffer,
- sizeof(sreq->sr_sense_buffer));
- }
- }
-
cmd->done(cmd);
}
EXPORT_SYMBOL(scsi_finish_command);
sdev->simple_tags = 1;
break;
default:
- printk(KERN_WARNING "(scsi%d:%d:%d:%d) "
- "scsi_adjust_queue_depth, bad queue type, "
- "disabled\n", sdev->host->host_no,
- sdev->channel, sdev->id, sdev->lun);
+ sdev_printk(KERN_WARNING, sdev,
+ "scsi_adjust_queue_depth, bad queue type, "
+ "disabled\n");
case 0:
sdev->ordered_tags = sdev->simple_tags = 0;
sdev->queue_depth = tags;
list_for_each_safe(lh, lh_sf, &active_list) {
scmd = list_entry(lh, struct scsi_cmnd, eh_entry);
list_del_init(lh);
- if (recovery) {
- scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD);
- } else {
+ if (recovery &&
+ !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)) {
scmd->result = (DID_ABORT << 16);
scsi_finish_command(scmd);
}
}
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");
if (error)
goto cleanup_sysctl;
- for (i = 0; i < NR_CPUS; i++)
+ for_each_possible_cpu(i)
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;
scsi_exit_sysctl();
scsi_exit_hosts();
scsi_exit_devinfo();
- devfs_remove("scsi");
scsi_exit_procfs();
scsi_exit_queue();
- unregister_scsi_cpu();
}
subsys_initcall(init_scsi);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff