Re: [PATCH v2 5/5] ufs: core: Add error handling for MCQ mode

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On 4/17/23 14:05, Bao D. Nguyen wrote:
+		/* MCQ mode */
+		if (is_mcq_enabled(hba))
+			return ufshcd_clear_cmds(hba, 1UL << lrbp->task_tag);

The above code will trigger an overflow if lrbp->task_tag >= 8 * sizeof(unsigned long). That's not acceptable.

  static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
  {
+	struct ufshcd_lrb *lrbp;
+	u32 hwq_num, utag;
+	int tag;
+
  	/* Resetting interrupt aggregation counters first and reading the
  	 * DOOR_BELL afterward allows us to handle all the completed requests.
  	 * In order to prevent other interrupts starvation the DB is read once
@@ -5580,7 +5590,22 @@ static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
  	 * Ignore the ufshcd_poll() return value and return IRQ_HANDLED since we
  	 * do not want polling to trigger spurious interrupt complaints.
  	 */
-	ufshcd_poll(hba->host, UFSHCD_POLL_FROM_INTERRUPT_CONTEXT);
+	if (!is_mcq_enabled(hba)) {
+		ufshcd_poll(hba->host, UFSHCD_POLL_FROM_INTERRUPT_CONTEXT);
+		goto out;
+	}
+
+	/* MCQ mode */
+	for (tag = 0; tag < hba->nutrs; tag++) {
+		lrbp = &hba->lrb[tag];
+		if (lrbp->cmd) {
+			utag = blk_mq_unique_tag(scsi_cmd_to_rq(lrbp->cmd));
+			hwq_num = blk_mq_unique_tag_to_hwq(utag);
+			ufshcd_poll(hba->host, hwq_num);
+		}
+	}

Is my understanding correct that ufshcd_transfer_req_compl() is only called from single doorbell code paths and hence that the above change is not necessary?


+	if (is_mcq_enabled(hba)) {
+		struct ufshcd_lrb *lrbp;
+		int tag;
+
+		for (tag = 0; tag < hba->nutrs; tag++) {
+			lrbp = &hba->lrb[tag];
+			if (lrbp->cmd) {
+				ret = ufshcd_try_to_abort_task(hba, tag);
+				dev_err(hba->dev, "Aborting tag %d / CDB %#02x %s\n", tag,
+					hba->lrb[tag].cmd ? hba->lrb[tag].cmd->cmnd[0] : -1,
+					ret ? "failed" : "succeeded");
+			}
+			if (ret) {
+				needs_reset = true;
+				goto out;
+			}
+		}
+	} else {
+		/* Clear pending transfer requests */
+		for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs) {
+			ret = ufshcd_try_to_abort_task(hba, tag);
+			dev_err(hba->dev, "Aborting tag %d / CDB %#02x %s\n", tag,
+				hba->lrb[tag].cmd ? hba->lrb[tag].cmd->cmnd[0] : -1,
+				ret ? "failed" : "succeeded");
+			if (ret) {
+				needs_reset = true;
+				goto out;
+			}
  		}
  	}

Please introduce helper functions for the MCQ and SDB code paths such that the nesting level of the above code is reduced.

Thanks,

Bart.



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