@@ -133,9 +133,11 @@ enum {
/* UFSHCD UIC layer error flags */
enum {
UFSHCD_UIC_DL_PA_INIT_ERROR = (1 << 0), /* Data link layer error */
- UFSHCD_UIC_NL_ERROR = (1 << 1), /* Network layer error */
- UFSHCD_UIC_TL_ERROR = (1 << 2), /* Transport Layer error */
- UFSHCD_UIC_DME_ERROR = (1 << 3), /* DME error */
+ UFSHCD_UIC_DL_NAC_RECEIVED_ERROR = (1 << 1), /* Data link layer error */
+ UFSHCD_UIC_DL_TCx_REPLAY_ERROR = (1 << 2), /* Data link layer error */
+ UFSHCD_UIC_NL_ERROR = (1 << 3), /* Network layer error */
+ UFSHCD_UIC_TL_ERROR = (1 << 4), /* Transport Layer error */
+ UFSHCD_UIC_DME_ERROR = (1 << 5), /* DME error */
};
/* Interrupt configuration options */
@@ -3465,31 +3467,18 @@ static void ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
}
/**
- * ufshcd_transfer_req_compl - handle SCSI and query command completion
+ * __ufshcd_transfer_req_compl - handle SCSI and query command completion
* @hba: per adapter instance
+ * @completed_reqs: requests to complete
*/
-static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
+static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
+ unsigned long completed_reqs)
{
struct ufshcd_lrb *lrbp;
struct scsi_cmnd *cmd;
- unsigned long completed_reqs;
- u32 tr_doorbell;
int result;
int index;
- /* 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
- * after reset. The down side of this solution is the possibility of
- * false interrupt if device completes another request after resetting
- * aggregation and before reading the DB.
- */
- if (ufshcd_is_intr_aggr_allowed(hba))
- ufshcd_reset_intr_aggr(hba);
-
- tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
- completed_reqs = tr_doorbell ^ hba->outstanding_reqs;
-
for_each_set_bit(index, &completed_reqs, hba->nutrs) {
lrbp = &hba->lrb[index];
cmd = lrbp->cmd;
@@ -3519,6 +3508,31 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
}
/**
+ * ufshcd_transfer_req_compl - handle SCSI and query command completion
+ * @hba: per adapter instance
+ */
+static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
+{
+ unsigned long completed_reqs;
+ u32 tr_doorbell;
+
+ /* 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
+ * after reset. The down side of this solution is the possibility of
+ * false interrupt if device completes another request after resetting
+ * aggregation and before reading the DB.
+ */
+ if (ufshcd_is_intr_aggr_allowed(hba))
+ ufshcd_reset_intr_aggr(hba);
+
+ tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
+ completed_reqs = tr_doorbell ^ hba->outstanding_reqs;
+
+ __ufshcd_transfer_req_compl(hba, completed_reqs);
+}
+
+/**
* ufshcd_disable_ee - disable exception event
* @hba: per-adapter instance
* @mask: exception event to disable
@@ -3773,6 +3787,13 @@ out:
return;
}
+/* Complete requests that have door-bell cleared */
+static void ufshcd_complete_requests(struct ufs_hba *hba)
+{
+ ufshcd_transfer_req_compl(hba);
+ ufshcd_tmc_handler(hba);
+}
+
/**
* ufshcd_err_handler - handle UFS errors that require s/w attention
* @work: pointer to work structure
@@ -3785,6 +3806,7 @@ static void ufshcd_err_handler(struct work_struct *work)
u32 err_tm = 0;
int err = 0;
int tag;
+ bool needs_reset = false;
hba = container_of(work, struct ufs_hba, eh_work);
@@ -3792,40 +3814,75 @@ static void ufshcd_err_handler(struct work_struct *work)
ufshcd_hold(hba, false);
spin_lock_irqsave(hba->host->host_lock, flags);
- if (hba->ufshcd_state == UFSHCD_STATE_RESET) {
- spin_unlock_irqrestore(hba->host->host_lock, flags);
+ if (hba->ufshcd_state == UFSHCD_STATE_RESET)
goto out;
- }
hba->ufshcd_state = UFSHCD_STATE_RESET;
ufshcd_set_eh_in_progress(hba);
/* Complete requests that have door-bell cleared by h/w */
- ufshcd_transfer_req_compl(hba);
- ufshcd_tmc_handler(hba);
- spin_unlock_irqrestore(hba->host->host_lock, flags);
+ ufshcd_complete_requests(hba);
+ if ((hba->saved_err & INT_FATAL_ERRORS) ||
+ ((hba->saved_err & UIC_ERROR) &&
+ (hba->saved_uic_err & (UFSHCD_UIC_DL_PA_INIT_ERROR |
+ UFSHCD_UIC_DL_NAC_RECEIVED_ERROR |
+ UFSHCD_UIC_DL_TCx_REPLAY_ERROR))))
+ needs_reset = true;
+ /*
+ * if host reset is required then skip clearing the pending
+ * transfers forcefully because they will automatically get
+ * cleared after link startup.
+ */
+ if (needs_reset)
+ goto skip_pending_xfer_clear;
+
+ /* release lock as clear command might sleep */
+ spin_unlock_irqrestore(hba->host->host_lock, flags);
/* Clear pending transfer requests */
- for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs)
- if (ufshcd_clear_cmd(hba, tag))
- err_xfer |= 1 << tag;
+ for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs) {
+ if (ufshcd_clear_cmd(hba, tag)) {
+ err_xfer = true;
+ goto lock_skip_pending_xfer_clear;
+ }
+ }
/* Clear pending task management requests */
- for_each_set_bit(tag, &hba->outstanding_tasks, hba->nutmrs)
- if (ufshcd_clear_tm_cmd(hba, tag))
- err_tm |= 1 << tag;
+ for_each_set_bit(tag, &hba->outstanding_tasks, hba->nutmrs) {
+ if (ufshcd_clear_tm_cmd(hba, tag)) {
+ err_tm = true;
+ goto lock_skip_pending_xfer_clear;
+ }
+ }
- /* Complete the requests that are cleared by s/w */
+lock_skip_pending_xfer_clear:
spin_lock_irqsave(hba->host->host_lock, flags);
- ufshcd_transfer_req_compl(hba);
- ufshcd_tmc_handler(hba);
- spin_unlock_irqrestore(hba->host->host_lock, flags);
+ /* Complete the requests that are cleared by s/w */
+ ufshcd_complete_requests(hba);
+
+ if (err_xfer || err_tm)
+ needs_reset = true;
+
+skip_pending_xfer_clear:
/* Fatal errors need reset */
- if (err_xfer || err_tm || (hba->saved_err & INT_FATAL_ERRORS) ||
- ((hba->saved_err & UIC_ERROR) &&
- (hba->saved_uic_err & UFSHCD_UIC_DL_PA_INIT_ERROR))) {
+ if (needs_reset) {
+ unsigned long max_doorbells = (1UL << hba->nutrs) - 1;
+
+ /*
+ * ufshcd_reset_and_restore() does the link reinitialization
+ * which will need atleast one empty doorbell slot to send the
+ * device management commands (NOP and query commands).
+ * If there is no slot empty at this moment then free up last
+ * slot forcefully.
+ */
+ if (hba->outstanding_reqs == max_doorbells)
+ __ufshcd_transfer_req_compl(hba,
+ (1UL << (hba->nutrs - 1)));
+
+ spin_unlock_irqrestore(hba->host->host_lock, flags);
err = ufshcd_reset_and_restore(hba);
+ spin_lock_irqsave(hba->host->host_lock, flags);
if (err) {
dev_err(hba->dev, "%s: reset and restore failed\n",
__func__);
@@ -3839,9 +3896,18 @@ static void ufshcd_err_handler(struct work_struct *work)
hba->saved_err = 0;
hba->saved_uic_err = 0;
}
+
+ if (!needs_reset) {
+ hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
+ if (hba->saved_err || hba->saved_uic_err)
+ dev_err_ratelimited(hba->dev, "%s: exit: saved_err 0x%x saved_uic_err 0x%x",
+ __func__, hba->saved_err, hba->saved_uic_err);
+ }
+
ufshcd_clear_eh_in_progress(hba);
out:
+ spin_unlock_irqrestore(hba->host->host_lock, flags);
scsi_unblock_requests(hba->host);
ufshcd_release(hba);
pm_runtime_put_sync(hba->dev);
@@ -3896,15 +3962,18 @@ static void ufshcd_check_errors(struct ufs_hba *hba)
}
if (queue_eh_work) {
+ /*
+ * update the transfer error masks to sticky bits, let's do this
+ * irrespective of current ufshcd_state.
+ */
+ hba->saved_err |= hba->errors;
+ hba->saved_uic_err |= hba->uic_error;
+
/* handle fatal errors only when link is functional */
if (hba->ufshcd_state == UFSHCD_STATE_OPERATIONAL) {
/* block commands from scsi mid-layer */
scsi_block_requests(hba->host);
- /* transfer error masks to sticky bits */
- hba->saved_err |= hba->errors;
- hba->saved_uic_err |= hba->uic_error;
-
hba->ufshcd_state = UFSHCD_STATE_ERROR;
schedule_work(&hba->eh_work);
}