libata: support the ata host which implements a queue depth less than 32

The sata on fsl mpc8315e is broken after the commit 8a4aeec8d2d6
("libata/ahci: accommodate tag ordered controllers"). The reason is
that the ata controller on this SoC only implement a queue depth of
16. When issuing the commands in tag order, all the commands in tag
16 ~ 31 are mapped to tag 0 unconditionally and then causes the sata
malfunction. It makes no senses to use a 32 queue in software while
the hardware has less queue depth. So consider the queue depth
implemented by the hardware when requesting a command tag.

Fixes: 8a4aeec8d2d6 ("libata/ahci: accommodate tag ordered controllers")
Cc: stable@vger.kernel.org
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 19 insertions, 3 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 18d97d5c7d90..d19c37a7abc9 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4787,6 +4787,10 @@ void swap_buf_le16(u16 *buf, unsigned int buf_words)
  *      ata_qc_new - Request an available ATA command, for queueing
  *      @ap: target port
  *
+ *      Some ATA host controllers may implement a queue depth which is less
+ *      than ATA_MAX_QUEUE. So we shouldn't allocate a tag which is beyond
+ *      the hardware limitation.
+ *
  *      LOCKING:
  *      None.
  */
@@ -4794,14 +4798,16 @@ void swap_buf_le16(u16 *buf, unsigned int buf_words)
 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
 {
         struct ata_queued_cmd *qc = NULL;
-        unsigned int i, tag;
+        unsigned int i, tag, max_queue;
+
+        max_queue = ap->scsi_host->can_queue;
 
         /* no command while frozen */
         if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
                 return NULL;
 
-        for (i = 0; i < ATA_MAX_QUEUE; i++) {
-                tag = (i + ap->last_tag + 1) % ATA_MAX_QUEUE;
+        for (i = 0, tag = ap->last_tag + 1; i < max_queue; i++, tag++) {
+                tag = tag < max_queue ? tag : 0;
 
                 /* the last tag is reserved for internal command. */
                 if (tag == ATA_TAG_INTERNAL)
@@ -6169,6 +6175,16 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
 {
         int i, rc;
 
+        /*
+         * The max queue supported by hardware must not be greater than
+         * ATA_MAX_QUEUE.
+         */
+        if (sht->can_queue > ATA_MAX_QUEUE) {
+                dev_err(host->dev, "BUG: the hardware max queue is too large\n");
+                WARN_ON(1);
+                return -EINVAL;
+        }
+
         /* host must have been started */
         if (!(host->flags & ATA_HOST_STARTED)) {
                 dev_err(host->dev, "BUG: trying to register unstarted host\n");