1 files changed, 80 insertions, 91 deletions

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 3841ab49f556..95be7ecdfe10 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -17,8 +17,6 @@
 #include <linux/blk-pm.h>
 #include <linux/blkdev.h>
 #include <scsi/scsi_driver.h>
-#include <scsi/scsi_transport.h>
-#include "../scsi_transport_api.h"
 #include "ufshcd.h"
 #include "ufs_quirks.h"
 #include "unipro.h"
@@ -237,6 +235,7 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
 static irqreturn_t ufshcd_intr(int irq, void *__hba);
 static int ufshcd_change_power_mode(struct ufs_hba *hba,
 			     struct ufs_pa_layer_attr *pwr_mode);
+static void ufshcd_schedule_eh_work(struct ufs_hba *hba);
 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,
@@ -319,8 +318,7 @@ static void ufshcd_add_query_upiu_trace(struct ufs_hba *hba,
 static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag,
 				     enum ufs_trace_str_t str_t)
 {
-	int off = (int)tag - hba->nutrs;
-	struct utp_task_req_desc *descp = &hba->utmrdl_base_addr[off];
+	struct utp_task_req_desc *descp = &hba->utmrdl_base_addr[tag];
 
 	if (!trace_ufshcd_upiu_enabled())
 		return;
@@ -2759,8 +2757,13 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 out:
 	up_read(&hba->clk_scaling_lock);
 
-	if (ufs_trigger_eh())
-		scsi_schedule_eh(hba->host);
+	if (ufs_trigger_eh()) {
+		unsigned long flags;
+
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		ufshcd_schedule_eh_work(hba);
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+	}
 
 	return err;
 }
@@ -3919,35 +3922,6 @@ out:
 }
 EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);
 
-static inline bool ufshcd_is_saved_err_fatal(struct ufs_hba *hba)
-{
-	lockdep_assert_held(hba->host->host_lock);
-
-	return (hba->saved_uic_err & UFSHCD_UIC_DL_PA_INIT_ERROR) ||
-	       (hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK));
-}
-
-static void ufshcd_schedule_eh(struct ufs_hba *hba)
-{
-	bool schedule_eh = false;
-	unsigned long flags;
-
-	spin_lock_irqsave(hba->host->host_lock, flags);
-	/* handle fatal errors only when link is not in error state */
-	if (hba->ufshcd_state != UFSHCD_STATE_ERROR) {
-		if (hba->force_reset || ufshcd_is_link_broken(hba) ||
-		    ufshcd_is_saved_err_fatal(hba))
-			hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED_FATAL;
-		else
-			hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED_NON_FATAL;
-		schedule_eh = true;
-	}
-	spin_unlock_irqrestore(hba->host->host_lock, flags);
-
-	if (schedule_eh)
-		scsi_schedule_eh(hba->host);
-}
-
 /**
  * ufshcd_uic_pwr_ctrl - executes UIC commands (which affects the link power
  * state) and waits for it to take effect.
@@ -3968,7 +3942,6 @@ static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
 {
 	DECLARE_COMPLETION_ONSTACK(uic_async_done);
 	unsigned long flags;
-	bool schedule_eh = false;
 	u8 status;
 	int ret;
 	bool reenable_intr = false;
@@ -4038,14 +4011,10 @@ out:
 		ufshcd_enable_intr(hba, UIC_COMMAND_COMPL);
 	if (ret) {
 		ufshcd_set_link_broken(hba);
-		schedule_eh = true;
+		ufshcd_schedule_eh_work(hba);
 	}
-
 out_unlock:
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
-
-	if (schedule_eh)
-		ufshcd_schedule_eh(hba);
 	mutex_unlock(&hba->uic_cmd_mutex);
 
 	return ret;
@@ -4776,7 +4745,7 @@ static int ufshcd_verify_dev_init(struct ufs_hba *hba)
 	mutex_lock(&hba->dev_cmd.lock);
 	for (retries = NOP_OUT_RETRIES; retries > 0; retries--) {
 		err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_NOP,
-					       NOP_OUT_TIMEOUT);
+					  hba->nop_out_timeout);
 
 		if (!err || err == -ETIMEDOUT)
 			break;
@@ -5911,6 +5880,27 @@ out:
 	return err_handling;
 }
 
+/* host lock must be held before calling this func */
+static inline bool ufshcd_is_saved_err_fatal(struct ufs_hba *hba)
+{
+	return (hba->saved_uic_err & UFSHCD_UIC_DL_PA_INIT_ERROR) ||
+	       (hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK));
+}
+
+/* host lock must be held before calling this func */
+static inline void ufshcd_schedule_eh_work(struct ufs_hba *hba)
+{
+	/* handle fatal errors only when link is not in error state */
+	if (hba->ufshcd_state != UFSHCD_STATE_ERROR) {
+		if (hba->force_reset || ufshcd_is_link_broken(hba) ||
+		    ufshcd_is_saved_err_fatal(hba))
+			hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED_FATAL;
+		else
+			hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED_NON_FATAL;
+		queue_work(hba->eh_wq, &hba->eh_work);
+	}
+}
+
 static void ufshcd_clk_scaling_allow(struct ufs_hba *hba, bool allow)
 {
 	down_write(&hba->clk_scaling_lock);
@@ -6044,11 +6034,11 @@ static bool ufshcd_is_pwr_mode_restore_needed(struct ufs_hba *hba)
 
 /**
  * ufshcd_err_handler - handle UFS errors that require s/w attention
- * @host: SCSI host pointer
+ * @work: pointer to work structure
  */
-static void ufshcd_err_handler(struct Scsi_Host *host)
+static void ufshcd_err_handler(struct work_struct *work)
 {
-	struct ufs_hba *hba = shost_priv(host);
+	struct ufs_hba *hba;
 	unsigned long flags;
 	bool err_xfer = false;
 	bool err_tm = false;
@@ -6056,9 +6046,10 @@ static void ufshcd_err_handler(struct Scsi_Host *host)
 	int tag;
 	bool needs_reset = false, needs_restore = false;
 
+	hba = container_of(work, struct ufs_hba, eh_work);
+
 	down(&hba->host_sem);
 	spin_lock_irqsave(hba->host->host_lock, flags);
-	hba->host->host_eh_scheduled = 0;
 	if (ufshcd_err_handling_should_stop(hba)) {
 		if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
 			hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
@@ -6371,6 +6362,7 @@ static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba, u32 intr_status)
 					 "host_regs: ");
 			ufshcd_print_pwr_info(hba);
 		}
+		ufshcd_schedule_eh_work(hba);
 		retval |= IRQ_HANDLED;
 	}
 	/*
@@ -6382,34 +6374,9 @@ static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba, u32 intr_status)
 	hba->errors = 0;
 	hba->uic_error = 0;
 	spin_unlock(hba->host->host_lock);
-
-	if (queue_eh_work)
-		ufshcd_schedule_eh(hba);
-
 	return retval;
 }
 
-struct ctm_info {
-	struct ufs_hba	*hba;
-	unsigned long	pending;
-	unsigned int	ncpl;
-};
-
-static bool ufshcd_compl_tm(struct request *req, void *priv, bool reserved)
-{
-	struct ctm_info *const ci = priv;
-	struct completion *c;
-
-	WARN_ON_ONCE(reserved);
-	if (test_bit(req->tag, &ci->pending))
-		return true;
-	ci->ncpl++;
-	c = req->end_io_data;
-	if (c)
-		complete(c);
-	return true;
-}
-
 /**
  * ufshcd_tmc_handler - handle task management function completion
  * @hba: per adapter instance
@@ -6420,18 +6387,24 @@ static bool ufshcd_compl_tm(struct request *req, void *priv, bool reserved)
  */
 static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba)
 {
-	unsigned long flags;
-	struct request_queue *q = hba->tmf_queue;
-	struct ctm_info ci = {
-		.hba	 = hba,
-	};
+	unsigned long flags, pending, issued;
+	irqreturn_t ret = IRQ_NONE;
+	int tag;
+
+	pending = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
 
 	spin_lock_irqsave(hba->host->host_lock, flags);
-	ci.pending = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
-	blk_mq_tagset_busy_iter(q->tag_set, ufshcd_compl_tm, &ci);
+	issued = hba->outstanding_tasks & ~pending;
+	for_each_set_bit(tag, &issued, hba->nutmrs) {
+		struct request *req = hba->tmf_rqs[tag];
+		struct completion *c = req->end_io_data;
+
+		complete(c);
+		ret = IRQ_HANDLED;
+	}
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
 
-	return ci.ncpl ? IRQ_HANDLED : IRQ_NONE;
+	return ret;
 }
 
 /**
@@ -6554,9 +6527,9 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
 	ufshcd_hold(hba, false);
 
 	spin_lock_irqsave(host->host_lock, flags);
-	blk_mq_start_request(req);
 
 	task_tag = req->tag;
+	hba->tmf_rqs[req->tag] = req;
 	treq->upiu_req.req_header.dword_0 |= cpu_to_be32(task_tag);
 
 	memcpy(hba->utmrdl_base_addr + task_tag, treq, sizeof(*treq));
@@ -6597,6 +6570,7 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
 	}
 
 	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->tmf_rqs[req->tag] = NULL;
 	__clear_bit(task_tag, &hba->outstanding_tasks);
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
 
@@ -6876,7 +6850,7 @@ static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)
 			err = ufshcd_clear_cmd(hba, pos);
 			if (err)
 				break;
-			__ufshcd_transfer_req_compl(hba, pos, /*retry_requests=*/true);
+			__ufshcd_transfer_req_compl(hba, 1U << pos, false);
 		}
 	}
 
@@ -7048,17 +7022,15 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
 	 * will be to send LU reset which, again, is a spec violation.
 	 * To avoid these unnecessary/illegal steps, first we clean up
 	 * the lrb taken by this cmd and re-set it in outstanding_reqs,
-	 * then queue the error handler and bail.
+	 * then queue the eh_work and bail.
 	 */
 	if (lrbp->lun == UFS_UPIU_UFS_DEVICE_WLUN) {
 		ufshcd_update_evt_hist(hba, UFS_EVT_ABORT, lrbp->lun);
 
 		spin_lock_irqsave(host->host_lock, flags);
 		hba->force_reset = true;
+		ufshcd_schedule_eh_work(hba);
 		spin_unlock_irqrestore(host->host_lock, flags);
-
-		ufshcd_schedule_eh(hba);
-
 		goto release;
 	}
 
@@ -7191,10 +7163,11 @@ static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd)
 
 	spin_lock_irqsave(hba->host->host_lock, flags);
 	hba->force_reset = true;
+	ufshcd_schedule_eh_work(hba);
 	dev_err(hba->dev, "%s: reset in progress - 1\n", __func__);
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
 
-	ufshcd_err_handler(hba->host);
+	flush_work(&hba->eh_work);
 
 	spin_lock_irqsave(hba->host->host_lock, flags);
 	if (hba->ufshcd_state == UFSHCD_STATE_ERROR)
@@ -8604,6 +8577,8 @@ static void ufshcd_hba_exit(struct ufs_hba *hba)
 	if (hba->is_powered) {
 		ufshcd_exit_clk_scaling(hba);
 		ufshcd_exit_clk_gating(hba);
+		if (hba->eh_wq)
+			destroy_workqueue(hba->eh_wq);
 		ufs_debugfs_hba_exit(hba);
 		ufshcd_variant_hba_exit(hba);
 		ufshcd_setup_vreg(hba, false);
@@ -9448,10 +9423,6 @@ static int ufshcd_set_dma_mask(struct ufs_hba *hba)
 	return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
 }
 
-static struct scsi_transport_template ufshcd_transport_template = {
-	.eh_strategy_handler = ufshcd_err_handler,
-};
-
 /**
  * ufshcd_alloc_host - allocate Host Bus Adapter (HBA)
  * @dev: pointer to device handle
@@ -9478,11 +9449,11 @@ int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
 		err = -ENOMEM;
 		goto out_error;
 	}
-	host->transportt = &ufshcd_transport_template;
 	hba = shost_priv(host);
 	hba->host = host;
 	hba->dev = dev;
 	hba->dev_ref_clk_freq = REF_CLK_FREQ_INVAL;
+	hba->nop_out_timeout = NOP_OUT_TIMEOUT;
 	INIT_LIST_HEAD(&hba->clk_list_head);
 	spin_lock_init(&hba->outstanding_lock);
 
@@ -9517,6 +9488,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 	int err;
 	struct Scsi_Host *host = hba->host;
 	struct device *dev = hba->dev;
+	char eh_wq_name[sizeof("ufs_eh_wq_00")];
 
 	if (!mmio_base) {
 		dev_err(hba->dev,
@@ -9570,6 +9542,17 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 
 	hba->max_pwr_info.is_valid = false;
 
+	/* Initialize work queues */
+	snprintf(eh_wq_name, sizeof(eh_wq_name), "ufs_eh_wq_%d",
+		 hba->host->host_no);
+	hba->eh_wq = create_singlethread_workqueue(eh_wq_name);
+	if (!hba->eh_wq) {
+		dev_err(hba->dev, "%s: failed to create eh workqueue\n",
+			__func__);
+		err = -ENOMEM;
+		goto out_disable;
+	}
+	INIT_WORK(&hba->eh_work, ufshcd_err_handler);
 	INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);
 
 	sema_init(&hba->host_sem, 1);
@@ -9638,6 +9621,12 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		err = PTR_ERR(hba->tmf_queue);
 		goto free_tmf_tag_set;
 	}
+	hba->tmf_rqs = devm_kcalloc(hba->dev, hba->nutmrs,
+				    sizeof(*hba->tmf_rqs), GFP_KERNEL);
+	if (!hba->tmf_rqs) {
+		err = -ENOMEM;
+		goto free_tmf_queue;
+	}
 
 	/* Reset the attached device */
 	ufshcd_device_reset(hba);