#include <linux/spinlock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_device.h>
-#include <scsi/scsi_request.h>
+#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <linux/libata.h>
#include <linux/hdreg.h>
#define SECTOR_SIZE 512
typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
-static struct ata_device *
-ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev);
-static void ata_scsi_error(struct Scsi_Host *host);
-enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
+
+static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
+ const struct scsi_device *scsidev);
+static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
+ const struct scsi_device *scsidev);
+static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+ unsigned int id, unsigned int lun);
+
#define RW_RECOVERY_MPAGE 0x1
#define RW_RECOVERY_MPAGE_LEN 12
struct scsi_transport_template ata_scsi_transport_template = {
.eh_strategy_handler = ata_scsi_error,
.eh_timed_out = ata_scsi_timed_out,
+ .user_scan = ata_scsi_user_scan,
};
&& copy_to_user(arg + sizeof(args), argbuf, argsize))
rc = -EFAULT;
error:
- if (argbuf)
- kfree(argbuf);
-
+ kfree(argbuf);
return rc;
}
/**
* ata_scsi_qc_new - acquire new ata_queued_cmd reference
- * @ap: ATA port to which the new command is attached
* @dev: ATA device to which the new command is attached
* @cmd: SCSI command that originated this ATA command
* @done: SCSI command completion function
* RETURNS:
* Command allocated, or %NULL if none available.
*/
-struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap,
- struct ata_device *dev,
+struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct ata_queued_cmd *qc;
- qc = ata_qc_new_init(ap, dev);
+ qc = ata_qc_new_init(dev);
if (qc) {
qc->scsicmd = cmd;
qc->scsidone = done;
}
}
-int ata_scsi_device_resume(struct scsi_device *sdev)
+/**
+ * ata_scsi_device_suspend - suspend ATA device associated with sdev
+ * @sdev: the SCSI device to suspend
+ * @state: target power management state
+ *
+ * Request suspend EH action on the ATA device associated with
+ * @sdev and wait for the operation to complete.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
{
- struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
- struct ata_device *dev = &ap->device[sdev->id];
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
+ struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+ unsigned long flags;
+ unsigned int action;
+ int rc = 0;
+
+ if (!dev)
+ goto out;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* wait for the previous resume to complete */
+ while (dev->flags & ATA_DFLAG_SUSPENDED) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ ata_port_wait_eh(ap);
+ spin_lock_irqsave(ap->lock, flags);
+ }
+
+ /* if @sdev is already detached, nothing to do */
+ if (sdev->sdev_state == SDEV_OFFLINE ||
+ sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
+ goto out_unlock;
+
+ /* request suspend */
+ action = ATA_EH_SUSPEND;
+ if (state.event != PM_EVENT_SUSPEND)
+ action |= ATA_EH_PM_FREEZE;
+ ap->eh_info.dev_action[dev->devno] |= action;
+ ap->eh_info.flags |= ATA_EHI_QUIET;
+ ata_port_schedule_eh(ap);
+
+ spin_unlock_irqrestore(ap->lock, flags);
- return ata_device_resume(ap, dev);
+ /* wait for EH to do the job */
+ ata_port_wait_eh(ap);
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* If @sdev is still attached but the associated ATA device
+ * isn't suspended, the operation failed.
+ */
+ if (sdev->sdev_state != SDEV_OFFLINE &&
+ sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL &&
+ !(dev->flags & ATA_DFLAG_SUSPENDED))
+ rc = -EIO;
+
+ out_unlock:
+ spin_unlock_irqrestore(ap->lock, flags);
+ out:
+ if (rc == 0)
+ sdev->sdev_gendev.power.power_state = state;
+ return rc;
}
-int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
+/**
+ * ata_scsi_device_resume - resume ATA device associated with sdev
+ * @sdev: the SCSI device to resume
+ *
+ * Request resume EH action on the ATA device associated with
+ * @sdev and return immediately. This enables parallel
+ * wakeup/spinup of devices.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0.
+ */
+int ata_scsi_device_resume(struct scsi_device *sdev)
{
- struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
- struct ata_device *dev = &ap->device[sdev->id];
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
+ struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+ struct ata_eh_info *ehi = &ap->eh_info;
+ unsigned long flags;
+ unsigned int action;
+
+ if (!dev)
+ goto out;
+
+ spin_lock_irqsave(ap->lock, flags);
- return ata_device_suspend(ap, dev, state);
+ /* if @sdev is already detached, nothing to do */
+ if (sdev->sdev_state == SDEV_OFFLINE ||
+ sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
+ goto out_unlock;
+
+ /* request resume */
+ action = ATA_EH_RESUME;
+ if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND)
+ __ata_ehi_hotplugged(ehi);
+ else
+ action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET;
+ ehi->dev_action[dev->devno] |= action;
+
+ /* We don't want autopsy and verbose EH messages. Disable
+ * those if we're the only device on this link.
+ */
+ if (ata_port_max_devices(ap) == 1)
+ ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
+
+ ata_port_schedule_eh(ap);
+
+ out_unlock:
+ spin_unlock_irqrestore(ap->lock, flags);
+ out:
+ sdev->sdev_gendev.power.power_state = PMSG_ON;
+ return 0;
}
/**
* @sk: the sense key we'll fill out
* @asc: the additional sense code we'll fill out
* @ascq: the additional sense code qualifier we'll fill out
+ * @verbose: be verbose
*
* Converts an ATA error into a SCSI error. Fill out pointers to
* SK, ASC, and ASCQ bytes for later use in fixed or descriptor
* spin_lock_irqsave(host_set lock)
*/
void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
- u8 *ascq)
+ u8 *ascq, int verbose)
{
int i;
}
}
/* No immediate match */
- printk(KERN_WARNING "ata%u: no sense translation for "
- "error 0x%02x\n", id, drv_err);
+ if (verbose)
+ printk(KERN_WARNING "ata%u: no sense translation for "
+ "error 0x%02x\n", id, drv_err);
}
/* Fall back to interpreting status bits */
}
}
/* No error? Undecoded? */
- printk(KERN_WARNING "ata%u: no sense translation for status: 0x%02x\n",
- id, drv_stat);
+ if (verbose)
+ printk(KERN_WARNING "ata%u: no sense translation for "
+ "status: 0x%02x\n", id, drv_stat);
/* We need a sensible error return here, which is tricky, and one
that won't cause people to do things like return a disk wrongly */
*ascq = 0x00;
translate_done:
+ if (verbose)
+ printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
+ "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
+ id, drv_stat, drv_err, *sk, *asc, *ascq);
return;
}
void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *cmd = qc->scsicmd;
- struct ata_taskfile *tf = &qc->tf;
+ struct ata_taskfile *tf = &qc->result_tf;
unsigned char *sb = cmd->sense_buffer;
unsigned char *desc = sb + 8;
+ int verbose = qc->ap->ops->error_handler == NULL;
memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
- /*
- * Read the controller registers.
- */
- WARN_ON(qc->ap->ops->tf_read == NULL);
- qc->ap->ops->tf_read(qc->ap, tf);
-
/*
* Use ata_to_sense_error() to map status register bits
* onto sense key, asc & ascq.
*/
- if (tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+ if (qc->err_mask ||
+ tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
- &sb[1], &sb[2], &sb[3]);
+ &sb[1], &sb[2], &sb[3], verbose);
sb[1] &= 0x0f;
}
void ata_gen_fixed_sense(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *cmd = qc->scsicmd;
- struct ata_taskfile *tf = &qc->tf;
+ struct ata_taskfile *tf = &qc->result_tf;
unsigned char *sb = cmd->sense_buffer;
+ int verbose = qc->ap->ops->error_handler == NULL;
memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
- /*
- * Read the controller registers.
- */
- WARN_ON(qc->ap->ops->tf_read == NULL);
- qc->ap->ops->tf_read(qc->ap, tf);
-
/*
* Use ata_to_sense_error() to map status register bits
* onto sense key, asc & ascq.
*/
- if (tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+ if (qc->err_mask ||
+ tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
- &sb[2], &sb[12], &sb[13]);
+ &sb[2], &sb[12], &sb[13], verbose);
sb[2] &= 0x0f;
}
*/
max_sectors = ATA_MAX_SECTORS;
if (dev->flags & ATA_DFLAG_LBA48)
- max_sectors = 2048;
+ max_sectors = ATA_MAX_SECTORS_LBA48;
if (dev->max_sectors)
max_sectors = dev->max_sectors;
request_queue_t *q = sdev->request_queue;
blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
}
+
+ if (dev->flags & ATA_DFLAG_NCQ) {
+ int depth;
+
+ depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+ depth = min(ATA_MAX_QUEUE - 1, depth);
+ scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
+ }
}
/**
int ata_scsi_slave_config(struct scsi_device *sdev)
{
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
+ struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
+
ata_scsi_sdev_config(sdev);
blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
- if (sdev->id < ATA_MAX_DEVICES) {
- struct ata_port *ap;
- struct ata_device *dev;
-
- ap = (struct ata_port *) &sdev->host->hostdata[0];
- dev = &ap->device[sdev->id];
-
+ if (dev)
ata_scsi_dev_config(sdev, dev);
- }
return 0; /* scsi layer doesn't check return value, sigh */
}
/**
- * ata_scsi_timed_out - SCSI layer time out callback
- * @cmd: timed out SCSI command
+ * ata_scsi_slave_destroy - SCSI device is about to be destroyed
+ * @sdev: SCSI device to be destroyed
*
- * Handles SCSI layer timeout. We race with normal completion of
- * the qc for @cmd. If the qc is already gone, we lose and let
- * the scsi command finish (EH_HANDLED). Otherwise, the qc has
- * timed out and EH should be invoked. Prevent ata_qc_complete()
- * from finishing it by setting EH_SCHEDULED and return
- * EH_NOT_HANDLED.
+ * @sdev is about to be destroyed for hot/warm unplugging. If
+ * this unplugging was initiated by libata as indicated by NULL
+ * dev->sdev, this function doesn't have to do anything.
+ * Otherwise, SCSI layer initiated warm-unplug is in progress.
+ * Clear dev->sdev, schedule the device for ATA detach and invoke
+ * EH.
*
* LOCKING:
- * Called from timer context
- *
- * RETURNS:
- * EH_HANDLED or EH_NOT_HANDLED
+ * Defined by SCSI layer. We don't really care.
*/
-enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
+void ata_scsi_slave_destroy(struct scsi_device *sdev)
{
- struct Scsi_Host *host = cmd->device->host;
- struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
unsigned long flags;
- struct ata_queued_cmd *qc;
- enum scsi_eh_timer_return ret = EH_HANDLED;
+ struct ata_device *dev;
- DPRINTK("ENTER\n");
+ if (!ap->ops->error_handler)
+ return;
- spin_lock_irqsave(&ap->host_set->lock, flags);
- qc = ata_qc_from_tag(ap, ap->active_tag);
- if (qc) {
- WARN_ON(qc->scsicmd != cmd);
- qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
- qc->err_mask |= AC_ERR_TIMEOUT;
- ret = EH_NOT_HANDLED;
+ spin_lock_irqsave(ap->lock, flags);
+ dev = __ata_scsi_find_dev(ap, sdev);
+ if (dev && dev->sdev) {
+ /* SCSI device already in CANCEL state, no need to offline it */
+ dev->sdev = NULL;
+ dev->flags |= ATA_DFLAG_DETACH;
+ ata_port_schedule_eh(ap);
}
- spin_unlock_irqrestore(&ap->host_set->lock, flags);
-
- DPRINTK("EXIT, ret=%d\n", ret);
- return ret;
+ spin_unlock_irqrestore(ap->lock, flags);
}
/**
- * ata_scsi_error - SCSI layer error handler callback
- * @host: SCSI host on which error occurred
+ * ata_scsi_change_queue_depth - SCSI callback for queue depth config
+ * @sdev: SCSI device to configure queue depth for
+ * @queue_depth: new queue depth
*
- * Handles SCSI-layer-thrown error events.
+ * This is libata standard hostt->change_queue_depth callback.
+ * SCSI will call into this callback when user tries to set queue
+ * depth via sysfs.
*
* LOCKING:
- * Inherited from SCSI layer (none, can sleep)
+ * SCSI layer (we don't care)
+ *
+ * RETURNS:
+ * Newly configured queue depth.
*/
-
-static void ata_scsi_error(struct Scsi_Host *host)
+int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
{
- struct ata_port *ap;
- unsigned long flags;
-
- DPRINTK("ENTER\n");
-
- ap = (struct ata_port *) &host->hostdata[0];
-
- spin_lock_irqsave(&ap->host_set->lock, flags);
- WARN_ON(ap->flags & ATA_FLAG_IN_EH);
- ap->flags |= ATA_FLAG_IN_EH;
- WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
- spin_unlock_irqrestore(&ap->host_set->lock, flags);
-
- ata_port_flush_task(ap);
-
- ap->ops->eng_timeout(ap);
-
- WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
-
- scsi_eh_flush_done_q(&ap->eh_done_q);
-
- spin_lock_irqsave(&ap->host_set->lock, flags);
- ap->flags &= ~ATA_FLAG_IN_EH;
- spin_unlock_irqrestore(&ap->host_set->lock, flags);
-
- DPRINTK("EXIT\n");
-}
-
-static void ata_eh_scsidone(struct scsi_cmnd *scmd)
-{
- /* nada */
-}
-
-static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
-{
- struct ata_port *ap = qc->ap;
- struct scsi_cmnd *scmd = qc->scsicmd;
- unsigned long flags;
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
+ struct ata_device *dev;
+ int max_depth;
- spin_lock_irqsave(&ap->host_set->lock, flags);
- qc->scsidone = ata_eh_scsidone;
- __ata_qc_complete(qc);
- WARN_ON(ata_tag_valid(qc->tag));
- spin_unlock_irqrestore(&ap->host_set->lock, flags);
+ if (queue_depth < 1)
+ return sdev->queue_depth;
- scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
-}
+ dev = ata_scsi_find_dev(ap, sdev);
+ if (!dev || !ata_dev_enabled(dev))
+ return sdev->queue_depth;
-/**
- * ata_eh_qc_complete - Complete an active ATA command from EH
- * @qc: Command to complete
- *
- * Indicate to the mid and upper layers that an ATA command has
- * completed. To be used from EH.
- */
-void ata_eh_qc_complete(struct ata_queued_cmd *qc)
-{
- struct scsi_cmnd *scmd = qc->scsicmd;
- scmd->retries = scmd->allowed;
- __ata_eh_qc_complete(qc);
-}
+ max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+ max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
+ if (queue_depth > max_depth)
+ queue_depth = max_depth;
-/**
- * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
- * @qc: Command to retry
- *
- * Indicate to the mid and upper layers that an ATA command
- * should be retried. To be used from EH.
- *
- * SCSI midlayer limits the number of retries to scmd->allowed.
- * This function might need to adjust scmd->retries for commands
- * which get retried due to unrelated NCQ failures.
- */
-void ata_eh_qc_retry(struct ata_queued_cmd *qc)
-{
- __ata_eh_qc_complete(qc);
+ scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
+ return queue_depth;
}
/**
tf->nsect = 1; /* 1 sector, lba=0 */
if (qc->dev->flags & ATA_DFLAG_LBA) {
- qc->tf.flags |= ATA_TFLAG_LBA;
+ tf->flags |= ATA_TFLAG_LBA;
tf->lbah = 0x0;
tf->lbam = 0x0;
u64 block;
u32 n_block;
+ qc->flags |= ATA_QCFLAG_IO;
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
*/
goto nothing_to_do;
- if (dev->flags & ATA_DFLAG_LBA) {
+ if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
+ /* yay, NCQ */
+ if (!lba_48_ok(block, n_block))
+ goto out_of_range;
+
+ tf->protocol = ATA_PROT_NCQ;
+ tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
+
+ if (tf->flags & ATA_TFLAG_WRITE)
+ tf->command = ATA_CMD_FPDMA_WRITE;
+ else
+ tf->command = ATA_CMD_FPDMA_READ;
+
+ qc->nsect = n_block;
+
+ tf->nsect = qc->tag << 3;
+ tf->hob_feature = (n_block >> 8) & 0xff;
+ tf->feature = n_block & 0xff;
+
+ tf->hob_lbah = (block >> 40) & 0xff;
+ tf->hob_lbam = (block >> 32) & 0xff;
+ tf->hob_lbal = (block >> 24) & 0xff;
+ tf->lbah = (block >> 16) & 0xff;
+ tf->lbam = (block >> 8) & 0xff;
+ tf->lbal = block & 0xff;
+
+ tf->device = 1 << 6;
+ if (tf->flags & ATA_TFLAG_FUA)
+ tf->device |= 1 << 7;
+ } else if (dev->flags & ATA_DFLAG_LBA) {
tf->flags |= ATA_TFLAG_LBA;
if (lba_28_ok(block, n_block)) {
u8 *cdb = cmd->cmnd;
int need_sense = (qc->err_mask != 0);
+ /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
+ * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
+ * cache
+ */
+ if (!need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
+ ((qc->tf.feature == SETFEATURES_WC_ON) ||
+ (qc->tf.feature == SETFEATURES_WC_OFF))) {
+ qc->ap->eh_info.action |= ATA_EH_REVALIDATE;
+ ata_port_schedule_eh(qc->ap);
+ }
+
/* For ATA pass thru (SAT) commands, generate a sense block if
* user mandated it or if there's an error. Note that if we
* generate because the user forced us to, a check condition
}
}
- if (need_sense) {
- /* The ata_gen_..._sense routines fill in tf */
- ata_dump_status(qc->ap->id, &qc->tf);
- }
+ if (need_sense && !qc->ap->ops->error_handler)
+ ata_dump_status(qc->ap->id, &qc->result_tf);
qc->scsidone(cmd);
ata_qc_free(qc);
}
+/**
+ * ata_scmd_need_defer - Check whether we need to defer scmd
+ * @dev: ATA device to which the command is addressed
+ * @is_io: Is the command IO (and thus possibly NCQ)?
+ *
+ * NCQ and non-NCQ commands cannot run together. As upper layer
+ * only knows the queue depth, we are responsible for maintaining
+ * exclusion. This function checks whether a new command can be
+ * issued to @dev.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ *
+ * RETURNS:
+ * 1 if deferring is needed, 0 otherwise.
+ */
+static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
+{
+ struct ata_port *ap = dev->ap;
+
+ if (!(dev->flags & ATA_DFLAG_NCQ))
+ return 0;
+
+ if (is_io) {
+ if (!ata_tag_valid(ap->active_tag))
+ return 0;
+ } else {
+ if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
+ return 0;
+ }
+ return 1;
+}
+
/**
* ata_scsi_translate - Translate then issue SCSI command to ATA device
- * @ap: ATA port to which the command is addressed
* @dev: ATA device to which the command is addressed
* @cmd: SCSI command to execute
* @done: SCSI command completion function
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
+ *
+ * RETURNS:
+ * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
+ * needs to be deferred.
*/
-
-static void ata_scsi_translate(struct ata_port *ap, struct ata_device *dev,
- struct scsi_cmnd *cmd,
+static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *),
ata_xlat_func_t xlat_func)
{
struct ata_queued_cmd *qc;
u8 *scsicmd = cmd->cmnd;
+ int is_io = xlat_func == ata_scsi_rw_xlat;
VPRINTK("ENTER\n");
- qc = ata_scsi_qc_new(ap, dev, cmd, done);
+ if (unlikely(ata_scmd_need_defer(dev, is_io)))
+ goto defer;
+
+ qc = ata_scsi_qc_new(dev, cmd, done);
if (!qc)
goto err_mem;
if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
cmd->sc_data_direction == DMA_TO_DEVICE) {
if (unlikely(cmd->request_bufflen < 1)) {
- printk(KERN_WARNING "ata%u(%u): WARNING: zero len r/w req\n",
- ap->id, dev->devno);
+ ata_dev_printk(dev, KERN_WARNING,
+ "WARNING: zero len r/w req\n");
goto err_did;
}
ata_qc_issue(qc);
VPRINTK("EXIT\n");
- return;
+ return 0;
early_finish:
ata_qc_free(qc);
done(cmd);
DPRINTK("EXIT - early finish (good or error)\n");
- return;
+ return 0;
err_did:
ata_qc_free(qc);
cmd->result = (DID_ERROR << 16);
done(cmd);
DPRINTK("EXIT - internal\n");
- return;
+ return 0;
+
+defer:
+ DPRINTK("EXIT - defer\n");
+ return SCSI_MLQUEUE_DEVICE_BUSY;
}
/**
return 0;
dpofua = 0;
- if (ata_dev_supports_fua(args->id) && dev->flags & ATA_DFLAG_LBA48 &&
+ if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
(!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
dpofua = 1 << 4;
static void atapi_sense_complete(struct ata_queued_cmd *qc)
{
- if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0))
+ if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
/* FIXME: not quite right; we don't want the
* translation of taskfile registers into
* a sense descriptors, since that's only
* correct for ATA, not ATAPI
*/
ata_gen_ata_desc_sense(qc);
+ }
qc->scsidone(qc->scsicmd);
ata_qc_free(qc);
VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
+ /* handle completion from new EH */
+ if (unlikely(qc->ap->ops->error_handler &&
+ (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
+
+ if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
+ /* FIXME: not quite right; we don't want the
+ * translation of taskfile registers into a
+ * sense descriptors, since that's only
+ * correct for ATA, not ATAPI
+ */
+ ata_gen_ata_desc_sense(qc);
+ }
+
+ /* SCSI EH automatically locks door if sdev->locked is
+ * set. Sometimes door lock request continues to
+ * fail, for example, when no media is present. This
+ * creates a loop - SCSI EH issues door lock which
+ * fails and gets invoked again to acquire sense data
+ * for the failed command.
+ *
+ * If door lock fails, always clear sdev->locked to
+ * avoid this infinite loop.
+ */
+ if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
+ qc->dev->sdev->locked = 0;
+
+ qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
+ qc->scsidone(cmd);
+ ata_qc_free(qc);
+ return;
+ }
+
+ /* successful completion or old EH failure path */
if (unlikely(err_mask & AC_ERR_DEV)) {
cmd->result = SAM_STAT_CHECK_CONDITION;
atapi_request_sense(qc);
return;
- }
-
- else if (unlikely(err_mask))
+ } else if (unlikely(err_mask)) {
/* FIXME: not quite right; we don't want the
* translation of taskfile registers into
* a sense descriptors, since that's only
* correct for ATA, not ATAPI
*/
ata_gen_ata_desc_sense(qc);
-
- else {
+ } else {
u8 *scsicmd = cmd->cmnd;
if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
qc->tf.protocol = ATA_PROT_ATAPI_DMA;
qc->tf.feature |= ATAPI_PKT_DMA;
-#ifdef ATAPI_ENABLE_DMADIR
- /* some SATA bridges need us to indicate data xfer direction */
- if (cmd->sc_data_direction != DMA_TO_DEVICE)
+ if (atapi_dmadir && (cmd->sc_data_direction != DMA_TO_DEVICE))
+ /* some SATA bridges need us to indicate data xfer direction */
qc->tf.feature |= ATAPI_DMADIR;
-#endif
}
- qc->nbytes = cmd->bufflen;
+ qc->nbytes = cmd->request_bufflen;
return 0;
}
+static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
+{
+ if (likely(id < ATA_MAX_DEVICES))
+ return &ap->device[id];
+ return NULL;
+}
+
+static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
+ const struct scsi_device *scsidev)
+{
+ /* skip commands not addressed to targets we simulate */
+ if (unlikely(scsidev->channel || scsidev->lun))
+ return NULL;
+
+ return ata_find_dev(ap, scsidev->id);
+}
+
+/**
+ * ata_scsi_dev_enabled - determine if device is enabled
+ * @dev: ATA device
+ *
+ * Determine if commands should be sent to the specified device.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ *
+ * RETURNS:
+ * 0 if commands are not allowed / 1 if commands are allowed
+ */
+
+static int ata_scsi_dev_enabled(struct ata_device *dev)
+{
+ if (unlikely(!ata_dev_enabled(dev)))
+ return 0;
+
+ if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
+ if (unlikely(dev->class == ATA_DEV_ATAPI)) {
+ ata_dev_printk(dev, KERN_WARNING,
+ "WARNING: ATAPI is %s, device ignored.\n",
+ atapi_enabled ? "not supported with this driver" : "disabled");
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
/**
* ata_scsi_find_dev - lookup ata_device from scsi_cmnd
* @ap: ATA port to which the device is attached
* RETURNS:
* Associated ATA device, or %NULL if not found.
*/
-
static struct ata_device *
ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
{
- struct ata_device *dev;
-
- /* skip commands not addressed to targets we simulate */
- if (likely(scsidev->id < ATA_MAX_DEVICES))
- dev = &ap->device[scsidev->id];
- else
- return NULL;
+ struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
- if (unlikely((scsidev->channel != 0) ||
- (scsidev->lun != 0)))
+ if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
return NULL;
- if (unlikely(!ata_dev_present(dev)))
- return NULL;
-
- if (!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) {
- if (unlikely(dev->class == ATA_DEV_ATAPI)) {
- printk(KERN_WARNING "ata%u(%u): WARNING: ATAPI is %s, device ignored.\n",
- ap->id, dev->devno, atapi_enabled ? "not supported with this driver" : "disabled");
- return NULL;
- }
- }
-
return dev;
}
{
struct ata_taskfile *tf = &(qc->tf);
struct scsi_cmnd *cmd = qc->scsicmd;
+ struct ata_device *dev = qc->dev;
if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
goto invalid_fld;
+ /* We may not issue DMA commands if no DMA mode is set */
+ if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
+ goto invalid_fld;
+
if (scsicmd[1] & 0xe0)
/* PIO multi not supported yet */
goto invalid_fld;
* TODO: find out if we need to do more here to
* cover scatter/gather case.
*/
- qc->nsect = cmd->bufflen / ATA_SECT_SIZE;
+ qc->nsect = cmd->request_bufflen / ATA_SECT_SIZE;
+
+ /* request result TF */
+ qc->flags |= ATA_QCFLAG_RESULT_TF;
return 0;
#endif
}
-static inline void __ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
- struct ata_port *ap, struct ata_device *dev)
+static inline int __ata_scsi_queuecmd(struct scsi_cmnd *cmd,
+ void (*done)(struct scsi_cmnd *),
+ struct ata_device *dev)
{
+ int rc = 0;
+
if (dev->class == ATA_DEV_ATA) {
ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
cmd->cmnd[0]);
if (xlat_func)
- ata_scsi_translate(ap, dev, cmd, done, xlat_func);
+ rc = ata_scsi_translate(dev, cmd, done, xlat_func);
else
- ata_scsi_simulate(ap, dev, cmd, done);
+ ata_scsi_simulate(dev, cmd, done);
} else
- ata_scsi_translate(ap, dev, cmd, done, atapi_xlat);
+ rc = ata_scsi_translate(dev, cmd, done, atapi_xlat);
+
+ return rc;
}
/**
* Releases scsi-layer-held lock, and obtains host_set lock.
*
* RETURNS:
- * Zero.
+ * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
+ * 0 otherwise.
*/
-
int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
struct ata_port *ap;
struct ata_device *dev;
struct scsi_device *scsidev = cmd->device;
struct Scsi_Host *shost = scsidev->host;
+ int rc = 0;
- ap = (struct ata_port *) &shost->hostdata[0];
+ ap = ata_shost_to_port(shost);
spin_unlock(shost->host_lock);
- spin_lock(&ap->host_set->lock);
+ spin_lock(ap->lock);
ata_scsi_dump_cdb(ap, cmd);
dev = ata_scsi_find_dev(ap, scsidev);
if (likely(dev))
- __ata_scsi_queuecmd(cmd, done, ap, dev);
+ rc = __ata_scsi_queuecmd(cmd, done, dev);
else {
cmd->result = (DID_BAD_TARGET << 16);
done(cmd);
}
- spin_unlock(&ap->host_set->lock);
+ spin_unlock(ap->lock);
spin_lock(shost->host_lock);
- return 0;
+ return rc;
}
/**
* ata_scsi_simulate - simulate SCSI command on ATA device
- * @ap: port the device is connected to
* @dev: the target device
* @cmd: SCSI command being sent to device.
* @done: SCSI command completion function.
* spin_lock_irqsave(host_set lock)
*/
-void ata_scsi_simulate(struct ata_port *ap, struct ata_device *dev,
- struct scsi_cmnd *cmd,
+void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct ata_scsi_args args;
const u8 *scsicmd = cmd->cmnd;
- args.ap = ap;
args.dev = dev;
args.id = dev->id;
args.cmd = cmd;
void ata_scsi_scan_host(struct ata_port *ap)
{
- struct ata_device *dev;
unsigned int i;
- if (ap->flags & ATA_FLAG_PORT_DISABLED)
+ if (ap->flags & ATA_FLAG_DISABLED)
return;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
- dev = &ap->device[i];
+ struct ata_device *dev = &ap->device[i];
+ struct scsi_device *sdev;
+
+ if (!ata_dev_enabled(dev) || dev->sdev)
+ continue;
+
+ sdev = __scsi_add_device(ap->host, 0, i, 0, NULL);
+ if (!IS_ERR(sdev)) {
+ dev->sdev = sdev;
+ scsi_device_put(sdev);
+ }
+ }
+}
- if (ata_dev_present(dev))
- scsi_scan_target(&ap->host->shost_gendev, 0, i, 0, 0);
+/**
+ * ata_scsi_offline_dev - offline attached SCSI device
+ * @dev: ATA device to offline attached SCSI device for
+ *
+ * This function is called from ata_eh_hotplug() and responsible
+ * for taking the SCSI device attached to @dev offline. This
+ * function is called with host_set lock which protects dev->sdev
+ * against clearing.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ *
+ * RETURNS:
+ * 1 if attached SCSI device exists, 0 otherwise.
+ */
+int ata_scsi_offline_dev(struct ata_device *dev)
+{
+ if (dev->sdev) {
+ scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
+ return 1;
}
+ return 0;
}
+/**
+ * ata_scsi_remove_dev - remove attached SCSI device
+ * @dev: ATA device to remove attached SCSI device for
+ *
+ * This function is called from ata_eh_scsi_hotplug() and
+ * responsible for removing the SCSI device attached to @dev.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+static void ata_scsi_remove_dev(struct ata_device *dev)
+{
+ struct ata_port *ap = dev->ap;
+ struct scsi_device *sdev;
+ unsigned long flags;
+
+ /* Alas, we need to grab scan_mutex to ensure SCSI device
+ * state doesn't change underneath us and thus
+ * scsi_device_get() always succeeds. The mutex locking can
+ * be removed if there is __scsi_device_get() interface which
+ * increments reference counts regardless of device state.
+ */
+ mutex_lock(&ap->host->scan_mutex);
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* clearing dev->sdev is protected by host_set lock */
+ sdev = dev->sdev;
+ dev->sdev = NULL;
+
+ if (sdev) {
+ /* If user initiated unplug races with us, sdev can go
+ * away underneath us after the host_set lock and
+ * scan_mutex are released. Hold onto it.
+ */
+ if (scsi_device_get(sdev) == 0) {
+ /* The following ensures the attached sdev is
+ * offline on return from ata_scsi_offline_dev()
+ * regardless it wins or loses the race
+ * against this function.
+ */
+ scsi_device_set_state(sdev, SDEV_OFFLINE);
+ } else {
+ WARN_ON(1);
+ sdev = NULL;
+ }
+ }
+
+ spin_unlock_irqrestore(ap->lock, flags);
+ mutex_unlock(&ap->host->scan_mutex);
+
+ if (sdev) {
+ ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
+ sdev->sdev_gendev.bus_id);
+
+ scsi_remove_device(sdev);
+ scsi_device_put(sdev);
+ }
+}
+
+/**
+ * ata_scsi_hotplug - SCSI part of hotplug
+ * @data: Pointer to ATA port to perform SCSI hotplug on
+ *
+ * Perform SCSI part of hotplug. It's executed from a separate
+ * workqueue after EH completes. This is necessary because SCSI
+ * hot plugging requires working EH and hot unplugging is
+ * synchronized with hot plugging with a mutex.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+void ata_scsi_hotplug(void *data)
+{
+ struct ata_port *ap = data;
+ int i;
+
+ if (ap->pflags & ATA_PFLAG_UNLOADING) {
+ DPRINTK("ENTER/EXIT - unloading\n");
+ return;
+ }
+
+ DPRINTK("ENTER\n");
+
+ /* unplug detached devices */
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ struct ata_device *dev = &ap->device[i];
+ unsigned long flags;
+
+ if (!(dev->flags & ATA_DFLAG_DETACHED))
+ continue;
+
+ spin_lock_irqsave(ap->lock, flags);
+ dev->flags &= ~ATA_DFLAG_DETACHED;
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ ata_scsi_remove_dev(dev);
+ }
+
+ /* scan for new ones */
+ ata_scsi_scan_host(ap);
+
+ /* If we scanned while EH was in progress, scan would have
+ * failed silently. Requeue if there are enabled but
+ * unattached devices.
+ */
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ struct ata_device *dev = &ap->device[i];
+ if (ata_dev_enabled(dev) && !dev->sdev) {
+ queue_delayed_work(ata_aux_wq, &ap->hotplug_task, HZ);
+ break;
+ }
+ }
+
+ DPRINTK("EXIT\n");
+}
+
+/**
+ * ata_scsi_user_scan - indication for user-initiated bus scan
+ * @shost: SCSI host to scan
+ * @channel: Channel to scan
+ * @id: ID to scan
+ * @lun: LUN to scan
+ *
+ * This function is called when user explicitly requests bus
+ * scan. Set probe pending flag and invoke EH.
+ *
+ * LOCKING:
+ * SCSI layer (we don't care)
+ *
+ * RETURNS:
+ * Zero.
+ */
+static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+ unsigned int id, unsigned int lun)
+{
+ struct ata_port *ap = ata_shost_to_port(shost);
+ unsigned long flags;
+ int rc = 0;
+
+ if (!ap->ops->error_handler)
+ return -EOPNOTSUPP;
+
+ if ((channel != SCAN_WILD_CARD && channel != 0) ||
+ (lun != SCAN_WILD_CARD && lun != 0))
+ return -EINVAL;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ if (id == SCAN_WILD_CARD) {
+ ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
+ ap->eh_info.action |= ATA_EH_SOFTRESET;
+ } else {
+ struct ata_device *dev = ata_find_dev(ap, id);
+
+ if (dev) {
+ ap->eh_info.probe_mask |= 1 << dev->devno;
+ ap->eh_info.action |= ATA_EH_SOFTRESET;
+ ap->eh_info.flags |= ATA_EHI_RESUME_LINK;
+ } else
+ rc = -EINVAL;
+ }
+
+ if (rc == 0)
+ ata_port_schedule_eh(ap);
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ return rc;
+}
+
+/**
+ * ata_scsi_dev_rescan - initiate scsi_rescan_device()
+ * @data: Pointer to ATA port to perform scsi_rescan_device()
+ *
+ * After ATA pass thru (SAT) commands are executed successfully,
+ * libata need to propagate the changes to SCSI layer. This
+ * function must be executed from ata_aux_wq such that sdev
+ * attach/detach don't race with rescan.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+void ata_scsi_dev_rescan(void *data)
+{
+ struct ata_port *ap = data;
+ struct ata_device *dev;
+ unsigned int i;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ dev = &ap->device[i];
+
+ if (ata_dev_enabled(dev) && dev->sdev)
+ scsi_rescan_device(&(dev->sdev->sdev_gendev));
+ }
+}
git://git.onelab.eu / linux-2.6.git / blobdiff