qc->cursg++;
qc->cursg_ofs = 0;
}
+}
- DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+/**
+ * ata_pio_sectors - Transfer one or many 512-byte sectors.
+ * @qc: Command on going
+ *
- * Transfer one or many ATA_SECT_SIZE of data from/to the
++ * Transfer one or many ATA_SECT_SIZE of data from/to the
+ * ATA device for the DRQ request.
+ *
+ * LOCKING:
+ * Inherited from caller.
+ */
+
+static void ata_pio_sectors(struct ata_queued_cmd *qc)
+{
+ if (is_multi_taskfile(&qc->tf)) {
+ /* READ/WRITE MULTIPLE */
+ unsigned int nsect;
+
+ WARN_ON(qc->dev->multi_count == 0);
+
+ nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
+ while (nsect--)
+ ata_pio_sector(qc);
+ } else
+ ata_pio_sector(qc);
+}
+
+/**
+ * atapi_send_cdb - Write CDB bytes to hardware
+ * @ap: Port to which ATAPI device is attached.
+ * @qc: Taskfile currently active
+ *
+ * When device has indicated its readiness to accept
+ * a CDB, this function is called. Send the CDB.
+ *
+ * LOCKING:
+ * caller.
+ */
- /* do the actual data transfer */
- do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
- ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
+static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
+{
+ /* send SCSI cdb */
+ DPRINTK("send cdb\n");
+ WARN_ON(qc->dev->cdb_len < 12);
- kunmap(page);
+ ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
+ ata_altstatus(ap); /* flush */
+
+ switch (qc->tf.protocol) {
+ case ATA_PROT_ATAPI:
+ ap->hsm_task_state = HSM_ST;
+ break;
+ case ATA_PROT_ATAPI_NODATA:
+ ap->hsm_task_state = HSM_ST_LAST;
+ break;
+ case ATA_PROT_ATAPI_DMA:
+ ap->hsm_task_state = HSM_ST_LAST;
+ /* initiate bmdma */
+ ap->ops->bmdma_start(qc);
+ break;
+ }
}
/**
}
/**
- * ata_pio_block - start PIO on a block
+ * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
* @ap: the target ata_port
+ * @qc: qc on going
*
- * LOCKING:
- * None. (executing in kernel thread context)
+ * RETURNS:
+ * 1 if ok in workqueue, 0 otherwise.
*/
-static void ata_pio_block(struct ata_port *ap)
+static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
{
- struct ata_queued_cmd *qc;
- u8 status;
-
- /*
- * This is purely heuristic. This is a fast path.
- * Sometimes when we enter, BSY will be cleared in
- * a chk-status or two. If not, the drive is probably seeking
- * or something. Snooze for a couple msecs, then
- * chk-status again. If still busy, fall back to
- * HSM_ST_POLL state.
- */
- status = ata_busy_wait(ap, ATA_BUSY, 5);
- if (status & ATA_BUSY) {
- msleep(2);
- status = ata_busy_wait(ap, ATA_BUSY, 10);
- if (status & ATA_BUSY) {
- ap->hsm_task_state = HSM_ST_POLL;
- ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
- return;
- }
- }
+ if (qc->tf.flags & ATA_TFLAG_POLLING)
+ return 1;
- qc = ata_qc_from_tag(ap, ap->active_tag);
- WARN_ON(qc == NULL);
+ if (ap->hsm_task_state == HSM_ST_FIRST) {
+ if (qc->tf.protocol == ATA_PROT_PIO &&
+ (qc->tf.flags & ATA_TFLAG_WRITE))
+ return 1;
- /* check error */
- if (status & (ATA_ERR | ATA_DF)) {
- qc->err_mask |= AC_ERR_DEV;
- ap->hsm_task_state = HSM_ST_ERR;
- return;
+ if (is_atapi_taskfile(&qc->tf) &&
+ !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+ return 1;
}
- /* transfer data if any */
- if (is_atapi_taskfile(&qc->tf)) {
- /* DRQ=0 means no more data to transfer */
- if ((status & ATA_DRQ) == 0) {
- ap->hsm_task_state = HSM_ST_LAST;
- return;
- }
-
- atapi_pio_bytes(qc);
- } else {
- /* handle BSY=0, DRQ=0 as error */
- if ((status & ATA_DRQ) == 0) {
- qc->err_mask |= AC_ERR_HSM;
- ap->hsm_task_state = HSM_ST_ERR;
- return;
- }
-
- ata_pio_sector(qc);
- }
-
- ata_altstatus(ap); /* flush */
-}
-
-static void ata_pio_error(struct ata_port *ap)
-{
- struct ata_queued_cmd *qc;
-
- qc = ata_qc_from_tag(ap, ap->active_tag);
- WARN_ON(qc == NULL);
-
- if (qc->tf.command != ATA_CMD_PACKET)
- printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
-
- /* make sure qc->err_mask is available to
- * know what's wrong and recover
- */
- WARN_ON(qc->err_mask == 0);
-
- ap->hsm_task_state = HSM_ST_IDLE;
-
- ata_poll_qc_complete(qc);
+ return 0;
}
-static void ata_pio_task(void *_data)
+/**
+ * ata_hsm_qc_complete - finish a qc running on standard HSM
+ * @qc: Command to complete
+ * @in_wq: 1 if called from workqueue, 0 otherwise
+ *
+ * Finish @qc which is running on standard HSM.
+ *
+ * LOCKING:
+ * If @in_wq is zero, spin_lock_irqsave(host_set lock).
+ * Otherwise, none on entry and grabs host lock.
+ */
+static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
{
- struct ata_port *ap = _data;
- unsigned long timeout;
- int qc_completed;
-
-fsm_start:
- timeout = 0;
- qc_completed = 0;
-
- switch (ap->hsm_task_state) {
- case HSM_ST_IDLE:
- return;
-
- case HSM_ST:
- ata_pio_block(ap);
- break;
+ struct ata_port *ap = qc->ap;
+ unsigned long flags;
- case HSM_ST_LAST:
- qc_completed = ata_pio_complete(ap);
- break;
+ if (ap->ops->error_handler) {
+ if (in_wq) {
+ spin_lock_irqsave(&ap->host_set->lock, flags);
- case HSM_ST_POLL:
- case HSM_ST_LAST_POLL:
- timeout = ata_pio_poll(ap);
- break;
+ /* EH might have kicked in while host_set lock
+ * is released.
+ */
+ qc = ata_qc_from_tag(ap, qc->tag);
+ if (qc) {
+ if (likely(!(qc->err_mask & AC_ERR_HSM))) {
+ ata_irq_on(ap);
+ ata_qc_complete(qc);
+ } else
+ ata_port_freeze(ap);
+ }
- case HSM_ST_TMOUT:
- case HSM_ST_ERR:
- ata_pio_error(ap);
- return;
+ spin_unlock_irqrestore(&ap->host_set->lock, flags);
+ } else {
+ if (likely(!(qc->err_mask & AC_ERR_HSM)))
+ ata_qc_complete(qc);
+ else
+ ata_port_freeze(ap);
+ }
+ } else {
+ if (in_wq) {
+ spin_lock_irqsave(&ap->host_set->lock, flags);
+ ata_irq_on(ap);
+ ata_qc_complete(qc);
+ spin_unlock_irqrestore(&ap->host_set->lock, flags);
+ } else
+ ata_qc_complete(qc);
}
- if (timeout)
- ata_port_queue_task(ap, ata_pio_task, ap, timeout);
- else if (!qc_completed)
- goto fsm_start;
+
++ ata_altstatus(ap); /* flush */
}
/**
git.openpandora.org / pandora-kernel.git / commitdiff