[PATCH v7 0/2] ufs: Rework tag allocation

[PATCH v7 0/2] ufs: Rework tag allocation

[Bart Van Assche]

Hi Martin,

This patch series simplifies and optimizes the UFS driver. Please consider
this patch series for kernel v5.6.

Thanks,

Bart.

Changes compared to v6:
- Reduced this patch series to include only those patches that received
  positive reviews.

Changes compared to v5:
- Reworked patch 4/4 such that it only modifies the clock scaling code and
  no other code. Added more comments in the code and improved the patch
  description.
- Rebased this patch series on top of the 5.5/scsi-queue branch.

Changes compared to v4:
- Reverted back to scsi_block_requests() / scsi_unblock_requests() for the
  UFS error handler.
- Added a new patch that serializes error handling and command submission.
- Fixed a blk_mq_init_queue() return value check.

Changes compared to v3:
- Left out "scsi" from the name of the functions that suspend and resume
  command processing.

Changes compared to v2:
- Use a separate tag set for TMF tags.

Changes compared to v1:
- Use the block layer tag infrastructure for managing TMF tags.
Bart Van Assche (2):
  ufs: Avoid busy-waiting by eliminating tag conflicts
  ufs: Use blk_{get,put}_request() to allocate and free TMFs

 drivers/scsi/ufs/ufshcd.c | 249 +++++++++++++++++++-------------------
 drivers/scsi/ufs/ufshcd.h |  18 +--
 2 files changed, 129 insertions(+), 138 deletions(-)

[PATCH v7 1/2] ufs: Avoid busy-waiting by eliminating tag conflicts

[Bart Van Assche]

Instead of tracking which tags are in use in the ufs_hba.lrb_in_use
bitmask, rely on the block layer tag allocation mechanism. This patch
removes the following busy-waiting loop if ufshcd_issue_devman_upiu_cmd()
and the block layer accidentally allocate the same tag for a SCSI request:
* ufshcd_queuecommand() returns SCSI_MLQUEUE_HOST_BUSY.
* The SCSI core requeues the SCSI command.

Tested-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Cc: Can Guo <cang@codeaurora.org>
Cc: Stanley Chu <stanley.chu@mediatek.com>
Cc: Avri Altman <avri.altman@wdc.com>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/scsi/ufs/ufshcd.c | 121 +++++++++++++++-----------------------
 drivers/scsi/ufs/ufshcd.h |   6 +-
 2 files changed, 50 insertions(+), 77 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index deca1538e184..7b3649111b4e 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -497,8 +497,8 @@ static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap)
 static void ufshcd_print_host_state(struct ufs_hba *hba)
 {
 	dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state);
-	dev_err(hba->dev, "lrb in use=0x%lx, outstanding reqs=0x%lx tasks=0x%lx\n",
-		hba->lrb_in_use, hba->outstanding_reqs, hba->outstanding_tasks);
+	dev_err(hba->dev, "outstanding reqs=0x%lx tasks=0x%lx\n",
+		hba->outstanding_reqs, hba->outstanding_tasks);
 	dev_err(hba->dev, "saved_err=0x%x, saved_uic_err=0x%x\n",
 		hba->saved_err, hba->saved_uic_err);
 	dev_err(hba->dev, "Device power mode=%d, UIC link state=%d\n",
@@ -1273,6 +1273,24 @@ static int ufshcd_devfreq_target(struct device *dev,
 	return ret;
 }
 
+static bool ufshcd_is_busy(struct request *req, void *priv, bool reserved)
+{
+	int *busy = priv;
+
+	WARN_ON_ONCE(reserved);
+	(*busy)++;
+	return false;
+}
+
+/* Whether or not any tag is in use by a request that is in progress. */
+static bool ufshcd_any_tag_in_use(struct ufs_hba *hba)
+{
+	struct request_queue *q = hba->cmd_queue;
+	int busy = 0;
+
+	blk_mq_tagset_busy_iter(q->tag_set, ufshcd_is_busy, &busy);
+	return busy;
+}
 
 static int ufshcd_devfreq_get_dev_status(struct device *dev,
 		struct devfreq_dev_status *stat)
@@ -1619,7 +1637,7 @@ static void ufshcd_gate_work(struct work_struct *work)
 
 	if (hba->clk_gating.active_reqs
 		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
-		|| hba->lrb_in_use || hba->outstanding_tasks
+		|| ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks
 		|| hba->active_uic_cmd || hba->uic_async_done)
 		goto rel_lock;
 
@@ -1673,7 +1691,7 @@ static void __ufshcd_release(struct ufs_hba *hba)
 
 	if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended
 		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
-		|| hba->lrb_in_use || hba->outstanding_tasks
+		|| ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks
 		|| hba->active_uic_cmd || hba->uic_async_done
 		|| ufshcd_eh_in_progress(hba))
 		return;
@@ -2443,22 +2461,9 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 
 	hba->req_abort_count = 0;
 
-	/* acquire the tag to make sure device cmds don't use it */
-	if (test_and_set_bit_lock(tag, &hba->lrb_in_use)) {
-		/*
-		 * Dev manage command in progress, requeue the command.
-		 * Requeuing the command helps in cases where the request *may*
-		 * find different tag instead of waiting for dev manage command
-		 * completion.
-		 */
-		err = SCSI_MLQUEUE_HOST_BUSY;
-		goto out;
-	}
-
 	err = ufshcd_hold(hba, true);
 	if (err) {
 		err = SCSI_MLQUEUE_HOST_BUSY;
-		clear_bit_unlock(tag, &hba->lrb_in_use);
 		goto out;
 	}
 	WARN_ON(hba->clk_gating.state != CLKS_ON);
@@ -2479,7 +2484,6 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 	err = ufshcd_map_sg(hba, lrbp);
 	if (err) {
 		lrbp->cmd = NULL;
-		clear_bit_unlock(tag, &hba->lrb_in_use);
 		goto out;
 	}
 	/* Make sure descriptors are ready before ringing the doorbell */
@@ -2626,44 +2630,6 @@ static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
 	return err;
 }
 
-/**
- * ufshcd_get_dev_cmd_tag - Get device management command tag
- * @hba: per-adapter instance
- * @tag_out: pointer to variable with available slot value
- *
- * Get a free slot and lock it until device management command
- * completes.
- *
- * Returns false if free slot is unavailable for locking, else
- * return true with tag value in @tag.
- */
-static bool ufshcd_get_dev_cmd_tag(struct ufs_hba *hba, int *tag_out)
-{
-	int tag;
-	bool ret = false;
-	unsigned long tmp;
-
-	if (!tag_out)
-		goto out;
-
-	do {
-		tmp = ~hba->lrb_in_use;
-		tag = find_last_bit(&tmp, hba->nutrs);
-		if (tag >= hba->nutrs)
-			goto out;
-	} while (test_and_set_bit_lock(tag, &hba->lrb_in_use));
-
-	*tag_out = tag;
-	ret = true;
-out:
-	return ret;
-}
-
-static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag)
-{
-	clear_bit_unlock(tag, &hba->lrb_in_use);
-}
-
 /**
  * ufshcd_exec_dev_cmd - API for sending device management requests
  * @hba: UFS hba
@@ -2676,6 +2642,8 @@ static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag)
 static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 		enum dev_cmd_type cmd_type, int timeout)
 {
+	struct request_queue *q = hba->cmd_queue;
+	struct request *req;
 	struct ufshcd_lrb *lrbp;
 	int err;
 	int tag;
@@ -2689,7 +2657,11 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 	 * Even though we use wait_event() which sleeps indefinitely,
 	 * the maximum wait time is bounded by SCSI request timeout.
 	 */
-	wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag));
+	req = blk_get_request(q, REQ_OP_DRV_OUT, 0);
+	if (IS_ERR(req))
+		return PTR_ERR(req);
+	tag = req->tag;
+	WARN_ON_ONCE(!ufshcd_valid_tag(hba, tag));
 
 	init_completion(&wait);
 	lrbp = &hba->lrb[tag];
@@ -2714,8 +2686,7 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 			err ? "query_complete_err" : "query_complete");
 
 out_put_tag:
-	ufshcd_put_dev_cmd_tag(hba, tag);
-	wake_up(&hba->dev_cmd.tag_wq);
+	blk_put_request(req);
 	up_read(&hba->clk_scaling_lock);
 	return err;
 }
@@ -4856,7 +4827,6 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
 			cmd->result = result;
 			/* Mark completed command as NULL in LRB */
 			lrbp->cmd = NULL;
-			clear_bit_unlock(index, &hba->lrb_in_use);
 			/* Do not touch lrbp after scsi done */
 			cmd->scsi_done(cmd);
 			__ufshcd_release(hba);
@@ -4878,9 +4848,6 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
 	hba->outstanding_reqs ^= completed_reqs;
 
 	ufshcd_clk_scaling_update_busy(hba);
-
-	/* we might have free'd some tags above */
-	wake_up(&hba->dev_cmd.tag_wq);
 }
 
 /**
@@ -5876,6 +5843,8 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 					enum dev_cmd_type cmd_type,
 					enum query_opcode desc_op)
 {
+	struct request_queue *q = hba->cmd_queue;
+	struct request *req;
 	struct ufshcd_lrb *lrbp;
 	int err = 0;
 	int tag;
@@ -5885,7 +5854,11 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 
 	down_read(&hba->clk_scaling_lock);
 
-	wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag));
+	req = blk_get_request(q, REQ_OP_DRV_OUT, 0);
+	if (IS_ERR(req))
+		return PTR_ERR(req);
+	tag = req->tag;
+	WARN_ON_ONCE(!ufshcd_valid_tag(hba, tag));
 
 	init_completion(&wait);
 	lrbp = &hba->lrb[tag];
@@ -5961,8 +5934,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 		}
 	}
 
-	ufshcd_put_dev_cmd_tag(hba, tag);
-	wake_up(&hba->dev_cmd.tag_wq);
+	blk_put_request(req);
 	up_read(&hba->clk_scaling_lock);
 	return err;
 }
@@ -6257,9 +6229,6 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
 	hba->lrb[tag].cmd = NULL;
 	spin_unlock_irqrestore(host->host_lock, flags);
 
-	clear_bit_unlock(tag, &hba->lrb_in_use);
-	wake_up(&hba->dev_cmd.tag_wq);
-
 out:
 	if (!err) {
 		err = SUCCESS;
@@ -8263,6 +8232,7 @@ void ufshcd_remove(struct ufs_hba *hba)
 {
 	ufs_bsg_remove(hba);
 	ufs_sysfs_remove_nodes(hba->dev);
+	blk_cleanup_queue(hba->cmd_queue);
 	scsi_remove_host(hba->host);
 	/* disable interrupts */
 	ufshcd_disable_intr(hba, hba->intr_mask);
@@ -8426,9 +8396,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 
 	init_rwsem(&hba->clk_scaling_lock);
 
-	/* Initialize device management tag acquire wait queue */
-	init_waitqueue_head(&hba->dev_cmd.tag_wq);
-
 	ufshcd_init_clk_gating(hba);
 
 	ufshcd_init_clk_scaling(hba);
@@ -8462,6 +8429,12 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		goto exit_gating;
 	}
 
+	hba->cmd_queue = blk_mq_init_queue(&hba->host->tag_set);
+	if (IS_ERR(hba->cmd_queue)) {
+		err = PTR_ERR(hba->cmd_queue);
+		goto out_remove_scsi_host;
+	}
+
 	/* Reset the attached device */
 	ufshcd_vops_device_reset(hba);
 
@@ -8471,7 +8444,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		dev_err(hba->dev, "Host controller enable failed\n");
 		ufshcd_print_host_regs(hba);
 		ufshcd_print_host_state(hba);
-		goto out_remove_scsi_host;
+		goto free_cmd_queue;
 	}
 
 	/*
@@ -8508,6 +8481,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 
 	return 0;
 
+free_cmd_queue:
+	blk_cleanup_queue(hba->cmd_queue);
 out_remove_scsi_host:
 	scsi_remove_host(hba->host);
 exit_gating:
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 2740f6941ec6..56b9da6db1cc 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -212,13 +212,11 @@ struct ufs_query {
  * @type: device management command type - Query, NOP OUT
  * @lock: lock to allow one command at a time
  * @complete: internal commands completion
- * @tag_wq: wait queue until free command slot is available
  */
 struct ufs_dev_cmd {
 	enum dev_cmd_type type;
 	struct mutex lock;
 	struct completion *complete;
-	wait_queue_head_t tag_wq;
 	struct ufs_query query;
 };
 
@@ -483,7 +481,7 @@ struct ufs_stats {
  * @host: Scsi_Host instance of the driver
  * @dev: device handle
  * @lrb: local reference block
- * @lrb_in_use: lrb in use
+ * @cmd_queue: Used to allocate command tags from hba->host->tag_set.
  * @outstanding_tasks: Bits representing outstanding task requests
  * @outstanding_reqs: Bits representing outstanding transfer requests
  * @capabilities: UFS Controller Capabilities
@@ -541,6 +539,7 @@ struct ufs_hba {
 
 	struct Scsi_Host *host;
 	struct device *dev;
+	struct request_queue *cmd_queue;
 	/*
 	 * This field is to keep a reference to "scsi_device" corresponding to
 	 * "UFS device" W-LU.
@@ -561,7 +560,6 @@ struct ufs_hba {
 	u32 ahit;
 
 	struct ufshcd_lrb *lrb;
-	unsigned long lrb_in_use;
 
 	unsigned long outstanding_tasks;
 	unsigned long outstanding_reqs;

[PATCH v7 2/2] ufs: Use blk_{get,put}_request() to allocate and free TMFs

[Bart Van Assche]

Manage TMF tags with blk_{get,put}_request() instead of
ufshcd_get_tm_free_slot() / ufshcd_put_tm_slot(). Store a per-request
completion pointer in request.end_io_data instead of using a waitqueue
to report TMF completion.

Tested-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Cc: Can Guo <cang@codeaurora.org>
Cc: Stanley Chu <stanley.chu@mediatek.com>
Cc: Avri Altman <avri.altman@wdc.com>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/scsi/ufs/ufshcd.c | 130 ++++++++++++++++++++++----------------
 drivers/scsi/ufs/ufshcd.h |  12 ++--
 2 files changed, 80 insertions(+), 62 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 7b3649111b4e..99337e0b54f6 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -645,40 +645,6 @@ static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
 	return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
 }
 
-/**
- * ufshcd_get_tm_free_slot - get a free slot for task management request
- * @hba: per adapter instance
- * @free_slot: pointer to variable with available slot value
- *
- * Get a free tag and lock it until ufshcd_put_tm_slot() is called.
- * Returns 0 if free slot is not available, else return 1 with tag value
- * in @free_slot.
- */
-static bool ufshcd_get_tm_free_slot(struct ufs_hba *hba, int *free_slot)
-{
-	int tag;
-	bool ret = false;
-
-	if (!free_slot)
-		goto out;
-
-	do {
-		tag = find_first_zero_bit(&hba->tm_slots_in_use, hba->nutmrs);
-		if (tag >= hba->nutmrs)
-			goto out;
-	} while (test_and_set_bit_lock(tag, &hba->tm_slots_in_use));
-
-	*free_slot = tag;
-	ret = true;
-out:
-	return ret;
-}
-
-static inline void ufshcd_put_tm_slot(struct ufs_hba *hba, int slot)
-{
-	clear_bit_unlock(slot, &hba->tm_slots_in_use);
-}
-
 /**
  * ufshcd_utrl_clear - Clear a bit in UTRLCLR register
  * @hba: per adapter instance
@@ -5583,6 +5549,27 @@ static irqreturn_t ufshcd_check_errors(struct ufs_hba *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
@@ -5593,16 +5580,14 @@ static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba)
  */
 static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba)
 {
-	u32 tm_doorbell;
+	struct request_queue *q = hba->tmf_queue;
+	struct ctm_info ci = {
+		.hba	 = hba,
+		.pending = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL),
+	};
 
-	tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
-	hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks;
-	if (hba->tm_condition) {
-		wake_up(&hba->tm_wq);
-		return IRQ_HANDLED;
-	} else {
-		return IRQ_NONE;
-	}
+	blk_mq_tagset_busy_iter(q->tag_set, ufshcd_compl_tm, &ci);
+	return ci.ncpl ? IRQ_HANDLED : IRQ_NONE;
 }
 
 /**
@@ -5708,7 +5693,10 @@ static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag)
 static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
 		struct utp_task_req_desc *treq, u8 tm_function)
 {
+	struct request_queue *q = hba->tmf_queue;
 	struct Scsi_Host *host = hba->host;
+	DECLARE_COMPLETION_ONSTACK(wait);
+	struct request *req;
 	unsigned long flags;
 	int free_slot, task_tag, err;
 
@@ -5717,7 +5705,10 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
 	 * Even though we use wait_event() which sleeps indefinitely,
 	 * the maximum wait time is bounded by %TM_CMD_TIMEOUT.
 	 */
-	wait_event(hba->tm_tag_wq, ufshcd_get_tm_free_slot(hba, &free_slot));
+	req = blk_get_request(q, REQ_OP_DRV_OUT, BLK_MQ_REQ_RESERVED);
+	req->end_io_data = &wait;
+	free_slot = req->tag;
+	WARN_ON_ONCE(free_slot < 0 || free_slot >= hba->nutmrs);
 	ufshcd_hold(hba, false);
 
 	spin_lock_irqsave(host->host_lock, flags);
@@ -5743,10 +5734,14 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
 	ufshcd_add_tm_upiu_trace(hba, task_tag, "tm_send");
 
 	/* wait until the task management command is completed */
-	err = wait_event_timeout(hba->tm_wq,
-			test_bit(free_slot, &hba->tm_condition),
+	err = wait_for_completion_io_timeout(&wait,
 			msecs_to_jiffies(TM_CMD_TIMEOUT));
 	if (!err) {
+		/*
+		 * Make sure that ufshcd_compl_tm() does not trigger a
+		 * use-after-free.
+		 */
+		req->end_io_data = NULL;
 		ufshcd_add_tm_upiu_trace(hba, task_tag, "tm_complete_err");
 		dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n",
 				__func__, tm_function);
@@ -5765,9 +5760,7 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
 	__clear_bit(free_slot, &hba->outstanding_tasks);
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
 
-	clear_bit(free_slot, &hba->tm_condition);
-	ufshcd_put_tm_slot(hba, free_slot);
-	wake_up(&hba->tm_tag_wq);
+	blk_put_request(req);
 
 	ufshcd_release(hba);
 	return err;
@@ -8232,6 +8225,8 @@ void ufshcd_remove(struct ufs_hba *hba)
 {
 	ufs_bsg_remove(hba);
 	ufs_sysfs_remove_nodes(hba->dev);
+	blk_cleanup_queue(hba->tmf_queue);
+	blk_mq_free_tag_set(&hba->tmf_tag_set);
 	blk_cleanup_queue(hba->cmd_queue);
 	scsi_remove_host(hba->host);
 	/* disable interrupts */
@@ -8311,6 +8306,18 @@ int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
 }
 EXPORT_SYMBOL(ufshcd_alloc_host);
 
+/* This function exists because blk_mq_alloc_tag_set() requires this. */
+static blk_status_t ufshcd_queue_tmf(struct blk_mq_hw_ctx *hctx,
+				     const struct blk_mq_queue_data *qd)
+{
+	WARN_ON_ONCE(true);
+	return BLK_STS_NOTSUPP;
+}
+
+static const struct blk_mq_ops ufshcd_tmf_ops = {
+	.queue_rq = ufshcd_queue_tmf,
+};
+
 /**
  * ufshcd_init - Driver initialization routine
  * @hba: per-adapter instance
@@ -8380,10 +8387,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 
 	hba->max_pwr_info.is_valid = false;
 
-	/* Initailize wait queue for task management */
-	init_waitqueue_head(&hba->tm_wq);
-	init_waitqueue_head(&hba->tm_tag_wq);
-
 	/* Initialize work queues */
 	INIT_WORK(&hba->eh_work, ufshcd_err_handler);
 	INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);
@@ -8435,6 +8438,21 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		goto out_remove_scsi_host;
 	}
 
+	hba->tmf_tag_set = (struct blk_mq_tag_set) {
+		.nr_hw_queues	= 1,
+		.queue_depth	= hba->nutmrs,
+		.ops		= &ufshcd_tmf_ops,
+		.flags		= BLK_MQ_F_NO_SCHED,
+	};
+	err = blk_mq_alloc_tag_set(&hba->tmf_tag_set);
+	if (err < 0)
+		goto free_cmd_queue;
+	hba->tmf_queue = blk_mq_init_queue(&hba->tmf_tag_set);
+	if (IS_ERR(hba->tmf_queue)) {
+		err = PTR_ERR(hba->tmf_queue);
+		goto free_tmf_tag_set;
+	}
+
 	/* Reset the attached device */
 	ufshcd_vops_device_reset(hba);
 
@@ -8444,7 +8462,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		dev_err(hba->dev, "Host controller enable failed\n");
 		ufshcd_print_host_regs(hba);
 		ufshcd_print_host_state(hba);
-		goto free_cmd_queue;
+		goto free_tmf_queue;
 	}
 
 	/*
@@ -8481,6 +8499,10 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 
 	return 0;
 
+free_tmf_queue:
+	blk_cleanup_queue(hba->tmf_queue);
+free_tmf_tag_set:
+	blk_mq_free_tag_set(&hba->tmf_tag_set);
 free_cmd_queue:
 	blk_cleanup_queue(hba->cmd_queue);
 out_remove_scsi_host:
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 56b9da6db1cc..53bfe175342c 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -493,11 +493,9 @@ struct ufs_stats {
  * @irq: Irq number of the controller
  * @active_uic_cmd: handle of active UIC command
  * @uic_cmd_mutex: mutex for uic command
- * @tm_wq: wait queue for task management
- * @tm_tag_wq: wait queue for free task management slots
- * @tm_slots_in_use: bit map of task management request slots in use
+ * @tmf_tag_set: TMF tag set.
+ * @tmf_queue: Used to allocate TMF tags.
  * @pwr_done: completion for power mode change
- * @tm_condition: condition variable for task management
  * @ufshcd_state: UFSHCD states
  * @eh_flags: Error handling flags
  * @intr_mask: Interrupt Mask Bits
@@ -641,10 +639,8 @@ struct ufs_hba {
 	/* Device deviations from standard UFS device spec. */
 	unsigned int dev_quirks;
 
-	wait_queue_head_t tm_wq;
-	wait_queue_head_t tm_tag_wq;
-	unsigned long tm_condition;
-	unsigned long tm_slots_in_use;
+	struct blk_mq_tag_set tmf_tag_set;
+	struct request_queue *tmf_queue;
 
 	struct uic_command *active_uic_cmd;
 	struct mutex uic_cmd_mutex;

Re: [PATCH v7 0/2] ufs: Rework tag allocation

[Martin K. Petersen]

Bart,

> This patch series simplifies and optimizes the UFS driver. Please
> consider this patch series for kernel v5.6.

Applied to 5.6/scsi-queue, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering