Re: [RFC PATCH v1 4/4] ufs: mcq: Added ufshcd_mcq_abort()
From: Bao D. Nguyen
Date: Thu Mar 09 2023 - 00:34:16 EST
On 3/8/2023 7:10 PM, Stanley Chu wrote:
Hi Bao,
On Wed, Mar 8, 2023 at 12:10 PM Bao D. Nguyen <quic_nguyenb@xxxxxxxxxxx> wrote:
Add ufshcd_mcq_abort() to support ufs abort in mcq mode.
Signed-off-by: Bao D. Nguyen <quic_nguyenb@xxxxxxxxxxx>
---
drivers/ufs/core/ufs-mcq.c | 76 ++++++++++++++++++++++++++++++++++++++++++
drivers/ufs/core/ufshcd-priv.h | 5 ++-
drivers/ufs/core/ufshcd.c | 11 ++++--
3 files changed, 88 insertions(+), 4 deletions(-)
diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index e27d8eb..6c65cd5 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -646,3 +646,79 @@ static bool ufshcd_mcq_cqe_search(struct ufs_hba *hba,
spin_unlock(&hwq->cq_lock);
return ret;
}
+
+/**
+ * ufshcd_mcq_abort - Abort the command in MCQ.
+ * @cmd - The command to be aborted.
+ *
+ * Returns SUCCESS or FAILED error codes
+ */
+int ufshcd_mcq_abort(struct scsi_cmnd *cmd)
+{
+ struct Scsi_Host *host = cmd->device->host;
+ struct ufs_hba *hba = shost_priv(host);
+ int tag = scsi_cmd_to_rq(cmd)->tag;
+ struct ufshcd_lrb *lrbp = &hba->lrb[tag];
+ struct ufs_hw_queue *hwq;
+ int err = FAILED;
+
+ if (!lrbp->cmd) {
+ dev_err(hba->dev,
+ "%s: skip abort. cmd at tag %d already completed.\n",
+ __func__, tag);
+ goto out;
+ }
+
+ /* Skip task abort in case previous aborts failed and report failure */
+ if (lrbp->req_abort_skip) {
+ dev_err(hba->dev, "%s: skip abort. tag %d failed earlier\n",
+ __func__, tag);
+ goto out;
+ }
+
+ hwq = ufshcd_mcq_req_to_hwq(hba, scsi_cmd_to_rq(cmd));
+
+ if (ufshcd_mcq_sqe_search(hba, hwq, tag)) {
+ /*
+ * Failure. The command should not be "stuck" in SQ for
+ * a long time which resulted in command being aborted.
+ */
+ dev_err(hba->dev, "%s: cmd found in sq. hwq=%d, tag=%d\n",
+ __func__, hwq->id, tag);
+ /* Set the Command Type to 0xF per the spec */
+ ufshcd_mcq_nullify_cmd(hba, hwq);
+ goto out;
+ }
+
+ if (ufshcd_mcq_cqe_search(hba, hwq, tag)) {
+ dev_err(hba->dev, "%s: cmd found in cq. hwq=%d, tag=%d\n",
+ __func__, hwq->id, tag);
+ /*
+ * The command should not be 'stuck' in the CQ for such a long time.
+ * Is interrupt missing? Process the CQEs here. If the interrupt is
+ * invoked at a later time, the CQ will be empty because the CQEs
+ * are already processed here.
+ */
+ ufshcd_mcq_poll_cqe_lock(hba, hwq);
+ err = SUCCESS;
+ goto out;
+ }
+
+ /*
+ * The command is not in the Submission Queue, and it is not
+ * in the Completion Queue either. Query the device to see if
+ * the command is being processed in the device.
+ */
+ if (ufshcd_try_to_abort_task(hba, tag)) {
+ dev_err(hba->dev, "%s: device abort failed %d\n", __func__, err);
+ lrbp->req_abort_skip = true;
+ goto out;
+ }
+
+ err = SUCCESS;
+ if (lrbp->cmd)
+ ufshcd_release_scsi_cmd(hba, lrbp);
+
+out:
+ return err;
+}
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 0527926..d883c03 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -77,7 +77,10 @@ unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
struct ufs_hw_queue *hwq);
int ufshcd_mcq_sq_cleanup(struct ufs_hba *hba, int task_tag, int *result);
-
+int ufshcd_mcq_abort(struct scsi_cmnd *cmd);
+int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag);
+void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
+ struct ufshcd_lrb *lrbp);
#define UFSHCD_MCQ_IO_QUEUE_OFFSET 1
#define SD_ASCII_STD true
#define SD_RAW false
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 408c16c..e06399e 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -302,7 +302,6 @@ static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on);
static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on);
static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
struct ufs_vreg *vreg);
-static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag);
static void ufshcd_wb_toggle_buf_flush_during_h8(struct ufs_hba *hba,
bool enable);
static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba);
@@ -5414,7 +5413,7 @@ static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
}
/* Release the resources allocated for processing a SCSI command. */
-static void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
+void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
struct ufshcd_lrb *lrbp)
{
struct scsi_cmnd *cmd = lrbp->cmd;
@@ -7340,7 +7339,7 @@ static void ufshcd_set_req_abort_skip(struct ufs_hba *hba, unsigned long bitmap)
*
* Returns zero on success, non-zero on failure
*/
-static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag)
+int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag)
{
struct ufshcd_lrb *lrbp = &hba->lrb[tag];
int err = 0;
@@ -7500,6 +7499,12 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
goto release;
}
+ if (is_mcq_enabled(hba)) {
+ /* MCQ mode. Branch off to handle abort for mcq mode */
+ err = ufshcd_mcq_abort(cmd);
+ goto release;
+ }
+
/* Skip task abort in case previous aborts failed and report failure */
if (lrbp->req_abort_skip) {
dev_err(hba->dev, "%s: skipping abort\n", __func__);
--
2.7.4
It seems that ufshcd_abort_all() also needs an error handling flow for MCQ.
Hi Stanley, thank you for the reviews.
I am not able to find the function ufshcd_abort_all() in the drivers/ufs
directory. Can you please clarify where this function is located? Thanks.
Thanks,
Stanley