[PATCH v17 1/2] scsi: ufs: Enable power management for wlun

[PATCH v17 1/2] scsi: ufs: Enable power management for wlun

[Asutosh Das]

During runtime-suspend of ufs host, the scsi devices are
already suspended and so are the queues associated with them.
But the ufs host sends SSU (START_STOP_UNIT) to wlun
during its runtime-suspend.
During the process blk_queue_enter checks if the queue is not in
suspended state. If so, it waits for the queue to resume, and never
comes out of it.
The commit
(d55d15a33: scsi: block: Do not accept any requests while suspended)
adds the check if the queue is in suspended state in blk_queue_enter().

Call trace:
 __switch_to+0x174/0x2c4
 __schedule+0x478/0x764
 schedule+0x9c/0xe0
 blk_queue_enter+0x158/0x228
 blk_mq_alloc_request+0x40/0xa4
 blk_get_request+0x2c/0x70
 __scsi_execute+0x60/0x1c4
 ufshcd_set_dev_pwr_mode+0x124/0x1e4
 ufshcd_suspend+0x208/0x83c
 ufshcd_runtime_suspend+0x40/0x154
 ufshcd_pltfrm_runtime_suspend+0x14/0x20
 pm_generic_runtime_suspend+0x28/0x3c
 __rpm_callback+0x80/0x2a4
 rpm_suspend+0x308/0x614
 rpm_idle+0x158/0x228
 pm_runtime_work+0x84/0xac
 process_one_work+0x1f0/0x470
 worker_thread+0x26c/0x4c8
 kthread+0x13c/0x320
 ret_from_fork+0x10/0x18

Fix this by registering ufs device wlun as a scsi driver and
registering it for block runtime-pm. Also make this as a
supplier for all other luns. That way, this device wlun
suspends after all the consumers and resumes after
hba resumes.

Co-developed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
 drivers/scsi/ufs/cdns-pltfrm.c     |   2 +
 drivers/scsi/ufs/tc-dwc-g210-pci.c |   2 +
 drivers/scsi/ufs/ufs-debugfs.c     |   6 +-
 drivers/scsi/ufs/ufs-debugfs.h     |   2 +-
 drivers/scsi/ufs/ufs-exynos.c      |   2 +
 drivers/scsi/ufs/ufs-hisi.c        |   2 +
 drivers/scsi/ufs/ufs-mediatek.c    |  12 +-
 drivers/scsi/ufs/ufs-qcom.c        |   2 +
 drivers/scsi/ufs/ufs_bsg.c         |   6 +-
 drivers/scsi/ufs/ufshcd-pci.c      |  36 +--
 drivers/scsi/ufs/ufshcd.c          | 642 ++++++++++++++++++++++++++-----------
 drivers/scsi/ufs/ufshcd.h          |   6 +
 include/trace/events/ufs.h         |  20 ++
 13 files changed, 509 insertions(+), 231 deletions(-)

diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
index 13d9204..b9105e4 100644
--- a/drivers/scsi/ufs/cdns-pltfrm.c
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -323,6 +323,8 @@ static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
 	.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
 	.runtime_resume  = ufshcd_pltfrm_runtime_resume,
 	.runtime_idle    = ufshcd_pltfrm_runtime_idle,
+	.prepare	 = ufshcd_suspend_prepare,
+	.complete	= ufshcd_resume_complete,
 };
 
 static struct platform_driver cdns_ufs_pltfrm_driver = {
diff --git a/drivers/scsi/ufs/tc-dwc-g210-pci.c b/drivers/scsi/ufs/tc-dwc-g210-pci.c
index 67a6a61..b01db12 100644
--- a/drivers/scsi/ufs/tc-dwc-g210-pci.c
+++ b/drivers/scsi/ufs/tc-dwc-g210-pci.c
@@ -148,6 +148,8 @@ static const struct dev_pm_ops tc_dwc_g210_pci_pm_ops = {
 	.runtime_suspend = tc_dwc_g210_pci_runtime_suspend,
 	.runtime_resume  = tc_dwc_g210_pci_runtime_resume,
 	.runtime_idle    = tc_dwc_g210_pci_runtime_idle,
+	.prepare	 = ufshcd_suspend_prepare,
+	.complete	= ufshcd_resume_complete,
 };
 
 static const struct pci_device_id tc_dwc_g210_pci_tbl[] = {
diff --git a/drivers/scsi/ufs/ufs-debugfs.c b/drivers/scsi/ufs/ufs-debugfs.c
index ced9ef4..1e8d92b 100644
--- a/drivers/scsi/ufs/ufs-debugfs.c
+++ b/drivers/scsi/ufs/ufs-debugfs.c
@@ -13,7 +13,7 @@ void __init ufs_debugfs_init(void)
 	ufs_debugfs_root = debugfs_create_dir("ufshcd", NULL);
 }
 
-void __exit ufs_debugfs_exit(void)
+void ufs_debugfs_exit(void)
 {
 	debugfs_remove_recursive(ufs_debugfs_root);
 }
@@ -60,14 +60,14 @@ __acquires(&hba->host_sem)
 		up(&hba->host_sem);
 		return -EBUSY;
 	}
-	pm_runtime_get_sync(hba->dev);
+	scsi_autopm_get_device(hba->sdev_ufs_device);
 	return 0;
 }
 
 static void ufs_debugfs_put_user_access(struct ufs_hba *hba)
 __releases(&hba->host_sem)
 {
-	pm_runtime_put_sync(hba->dev);
+	scsi_autopm_put_device(hba->sdev_ufs_device);
 	up(&hba->host_sem);
 }
 
diff --git a/drivers/scsi/ufs/ufs-debugfs.h b/drivers/scsi/ufs/ufs-debugfs.h
index 3ca29d3..97548a3 100644
--- a/drivers/scsi/ufs/ufs-debugfs.h
+++ b/drivers/scsi/ufs/ufs-debugfs.h
@@ -9,7 +9,7 @@ struct ufs_hba;
 
 #ifdef CONFIG_DEBUG_FS
 void __init ufs_debugfs_init(void);
-void __exit ufs_debugfs_exit(void);
+void ufs_debugfs_exit(void);
 void ufs_debugfs_hba_init(struct ufs_hba *hba);
 void ufs_debugfs_hba_exit(struct ufs_hba *hba);
 void ufs_debugfs_exception_event(struct ufs_hba *hba, u16 status);
diff --git a/drivers/scsi/ufs/ufs-exynos.c b/drivers/scsi/ufs/ufs-exynos.c
index 70647ea..49a918c 100644
--- a/drivers/scsi/ufs/ufs-exynos.c
+++ b/drivers/scsi/ufs/ufs-exynos.c
@@ -1267,6 +1267,8 @@ static const struct dev_pm_ops exynos_ufs_pm_ops = {
 	.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
 	.runtime_resume  = ufshcd_pltfrm_runtime_resume,
 	.runtime_idle    = ufshcd_pltfrm_runtime_idle,
+	.prepare	 = ufshcd_suspend_prepare,
+	.complete	= ufshcd_resume_complete,
 };
 
 static struct platform_driver exynos_ufs_pltform = {
diff --git a/drivers/scsi/ufs/ufs-hisi.c b/drivers/scsi/ufs/ufs-hisi.c
index 0aa5813..d463b44 100644
--- a/drivers/scsi/ufs/ufs-hisi.c
+++ b/drivers/scsi/ufs/ufs-hisi.c
@@ -574,6 +574,8 @@ static const struct dev_pm_ops ufs_hisi_pm_ops = {
 	.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
 	.runtime_resume  = ufshcd_pltfrm_runtime_resume,
 	.runtime_idle    = ufshcd_pltfrm_runtime_idle,
+	.prepare	 = ufshcd_suspend_prepare,
+	.complete	= ufshcd_resume_complete,
 };
 
 static struct platform_driver ufs_hisi_pltform = {
diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index a981f26..4862a7b 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -810,12 +810,10 @@ static int ufs_mtk_post_link(struct ufs_hba *hba)
 	/* enable unipro clock gating feature */
 	ufs_mtk_cfg_unipro_cg(hba, true);
 
-	/* configure auto-hibern8 timer to 10ms */
-	if (ufshcd_is_auto_hibern8_supported(hba)) {
-		ufshcd_auto_hibern8_update(hba,
-			FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 10) |
-			FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3));
-	}
+	/* will be configured during probe hba */
+	if (ufshcd_is_auto_hibern8_supported(hba))
+		hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 10) |
+			FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
 
 	ufs_mtk_setup_clk_gating(hba);
 
@@ -1097,6 +1095,8 @@ static const struct dev_pm_ops ufs_mtk_pm_ops = {
 	.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
 	.runtime_resume  = ufshcd_pltfrm_runtime_resume,
 	.runtime_idle    = ufshcd_pltfrm_runtime_idle,
+	.prepare	 = ufshcd_suspend_prepare,
+	.complete	= ufshcd_resume_complete,
 };
 
 static struct platform_driver ufs_mtk_pltform = {
diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 9b711d6..6651b87 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1556,6 +1556,8 @@ static const struct dev_pm_ops ufs_qcom_pm_ops = {
 	.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
 	.runtime_resume  = ufshcd_pltfrm_runtime_resume,
 	.runtime_idle    = ufshcd_pltfrm_runtime_idle,
+	.prepare	 = ufshcd_suspend_prepare,
+	.complete	= ufshcd_resume_complete,
 };
 
 static struct platform_driver ufs_qcom_pltform = {
diff --git a/drivers/scsi/ufs/ufs_bsg.c b/drivers/scsi/ufs/ufs_bsg.c
index 5b2bc1a..cbb5a90 100644
--- a/drivers/scsi/ufs/ufs_bsg.c
+++ b/drivers/scsi/ufs/ufs_bsg.c
@@ -97,7 +97,7 @@ static int ufs_bsg_request(struct bsg_job *job)
 
 	bsg_reply->reply_payload_rcv_len = 0;
 
-	pm_runtime_get_sync(hba->dev);
+	scsi_autopm_get_device(hba->sdev_ufs_device);
 
 	msgcode = bsg_request->msgcode;
 	switch (msgcode) {
@@ -106,7 +106,7 @@ static int ufs_bsg_request(struct bsg_job *job)
 		ret = ufs_bsg_alloc_desc_buffer(hba, job, &desc_buff,
 						&desc_len, desc_op);
 		if (ret) {
-			pm_runtime_put_sync(hba->dev);
+			scsi_autopm_put_device(hba->sdev_ufs_device);
 			goto out;
 		}
 
@@ -138,7 +138,7 @@ static int ufs_bsg_request(struct bsg_job *job)
 		break;
 	}
 
-	pm_runtime_put_sync(hba->dev);
+	scsi_autopm_put_device(hba->sdev_ufs_device);
 
 	if (!desc_buff)
 		goto out;
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
index 23ee828..e6c334b 100644
--- a/drivers/scsi/ufs/ufshcd-pci.c
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -410,29 +410,6 @@ static int ufshcd_pci_resume(struct device *dev)
 	return ufshcd_system_resume(dev_get_drvdata(dev));
 }
 
-/**
- * ufshcd_pci_poweroff - suspend-to-disk poweroff function
- * @dev: pointer to PCI device handle
- *
- * Returns 0 if successful
- * Returns non-zero otherwise
- */
-static int ufshcd_pci_poweroff(struct device *dev)
-{
-	struct ufs_hba *hba = dev_get_drvdata(dev);
-	int spm_lvl = hba->spm_lvl;
-	int ret;
-
-	/*
-	 * For poweroff we need to set the UFS device to PowerDown mode.
-	 * Force spm_lvl to ensure that.
-	 */
-	hba->spm_lvl = 5;
-	ret = ufshcd_system_suspend(hba);
-	hba->spm_lvl = spm_lvl;
-	return ret;
-}
-
 #endif /* !CONFIG_PM_SLEEP */
 
 #ifdef CONFIG_PM
@@ -533,17 +510,14 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 }
 
 static const struct dev_pm_ops ufshcd_pci_pm_ops = {
-#ifdef CONFIG_PM_SLEEP
-	.suspend	= ufshcd_pci_suspend,
-	.resume		= ufshcd_pci_resume,
-	.freeze		= ufshcd_pci_suspend,
-	.thaw		= ufshcd_pci_resume,
-	.poweroff	= ufshcd_pci_poweroff,
-	.restore	= ufshcd_pci_resume,
-#endif
 	SET_RUNTIME_PM_OPS(ufshcd_pci_runtime_suspend,
 			   ufshcd_pci_runtime_resume,
 			   ufshcd_pci_runtime_idle)
+	SET_SYSTEM_SLEEP_PM_OPS(ufshcd_pci_suspend, ufshcd_pci_resume)
+#ifdef CONFIG_PM_SLEEP
+	.prepare	= ufshcd_suspend_prepare,
+	.complete	= ufshcd_resume_complete,
+#endif
 };
 
 static const struct pci_device_id ufshcd_pci_tbl[] = {
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 0625da7..a0e6478 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -16,6 +16,7 @@
 #include <linux/bitfield.h>
 #include <linux/blk-pm.h>
 #include <linux/blkdev.h>
+#include <scsi/scsi_driver.h>
 #include "ufshcd.h"
 #include "ufs_quirks.h"
 #include "unipro.h"
@@ -77,6 +78,8 @@
 /* Polling time to wait for fDeviceInit */
 #define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */
 
+#define wlun_dev_to_hba(dv) shost_priv(to_scsi_device(dv)->host)
+
 #define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
 	({                                                              \
 		int _ret;                                               \
@@ -1551,7 +1554,7 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
 	if (value == hba->clk_scaling.is_enabled)
 		goto out;
 
-	pm_runtime_get_sync(hba->dev);
+	scsi_autopm_get_device(hba->sdev_ufs_device);
 	ufshcd_hold(hba, false);
 
 	hba->clk_scaling.is_enabled = value;
@@ -1567,7 +1570,7 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
 	}
 
 	ufshcd_release(hba);
-	pm_runtime_put_sync(hba->dev);
+	scsi_autopm_put_device(hba->sdev_ufs_device);
 out:
 	up(&hba->host_sem);
 	return err ? err : count;
@@ -2565,6 +2568,17 @@ static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
 	return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
 }
 
+static inline bool is_rpmb_wlun(struct scsi_device *sdev)
+{
+	return (sdev->lun == ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN));
+}
+
+static inline bool is_device_wlun(struct scsi_device *sdev)
+{
+	return (sdev->lun ==
+		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN));
+}
+
 static void ufshcd_init_lrb(struct ufs_hba *hba, struct ufshcd_lrb *lrb, int i)
 {
 	struct utp_transfer_cmd_desc *cmd_descp = hba->ucdl_base_addr;
@@ -4098,12 +4112,13 @@ void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
 	}
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
 
-	if (update && !pm_runtime_suspended(hba->dev)) {
-		pm_runtime_get_sync(hba->dev);
+	if (update &&
+	    !pm_runtime_suspended(&hba->sdev_ufs_device->sdev_gendev)) {
+		scsi_autopm_get_device(hba->sdev_ufs_device);
 		ufshcd_hold(hba, false);
 		ufshcd_auto_hibern8_enable(hba);
 		ufshcd_release(hba);
-		pm_runtime_put(hba->dev);
+		scsi_autopm_put_device(hba->sdev_ufs_device);
 	}
 }
 EXPORT_SYMBOL_GPL(ufshcd_auto_hibern8_update);
@@ -4801,6 +4816,40 @@ static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba,
 }
 
 /**
+ * ufshcd_setup_links - associate link b/w device wlun and other luns
+ * @sdev: pointer to SCSI device
+ * @hba: pointer to ufs hba
+ */
+static void ufshcd_setup_links(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	struct device_link *link;
+
+	/*
+	 * device wlun is the supplier & rest of the luns are consumers
+	 * This ensures that device wlun suspends after all other luns.
+	 */
+	if (hba->sdev_ufs_device) {
+		link = device_link_add(&sdev->sdev_gendev,
+				       &hba->sdev_ufs_device->sdev_gendev,
+				       DL_FLAG_PM_RUNTIME|DL_FLAG_RPM_ACTIVE);
+		if (!link) {
+			dev_err(&sdev->sdev_gendev, "Failed establishing link - %s\n",
+				dev_name(&hba->sdev_ufs_device->sdev_gendev));
+			return;
+		}
+		hba->luns_avail--;
+		/* Ignore REPORT_LUN wlun probing */
+		if (hba->luns_avail == 1) {
+			pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
+			return;
+		}
+	} else {
+		/* device wlun is probed */
+		hba->luns_avail--;
+	}
+}
+
+/**
  * ufshcd_slave_alloc - handle initial SCSI device configurations
  * @sdev: pointer to SCSI device
  *
@@ -4831,6 +4880,8 @@ static int ufshcd_slave_alloc(struct scsi_device *sdev)
 
 	ufshcd_get_lu_power_on_wp_status(hba, sdev);
 
+	ufshcd_setup_links(hba, sdev);
+
 	return 0;
 }
 
@@ -4862,8 +4913,13 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
 	blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
 	if (hba->quirks & UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE)
 		blk_queue_update_dma_alignment(q, PAGE_SIZE - 1);
-
-	if (ufshcd_is_rpm_autosuspend_allowed(hba))
+	/*
+	 * Block runtime-pm until all consumers are added.
+	 * Refer ufshcd_setup_links().
+	 */
+	if (is_device_wlun(sdev))
+		pm_runtime_get_noresume(&sdev->sdev_gendev);
+	else if (ufshcd_is_rpm_autosuspend_allowed(hba))
 		sdev->rpm_autosuspend = 1;
 
 	ufshcd_crypto_setup_rq_keyslot_manager(hba, q);
@@ -4979,15 +5035,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 			 */
 			if (!hba->pm_op_in_progress &&
 			    !ufshcd_eh_in_progress(hba) &&
-			    ufshcd_is_exception_event(lrbp->ucd_rsp_ptr) &&
-			    schedule_work(&hba->eeh_work)) {
-				/*
-				 * Prevent suspend once eeh_work is scheduled
-				 * to avoid deadlock between ufshcd_suspend
-				 * and exception event handler.
-				 */
-				pm_runtime_get_noresume(hba->dev);
-			}
+			    ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
+				/* Flushed in suspend */
+				schedule_work(&hba->eeh_work);
 			break;
 		case UPIU_TRANSACTION_REJECT_UPIU:
 			/* TODO: handle Reject UPIU Response */
@@ -5586,8 +5636,8 @@ static void ufshcd_rpm_dev_flush_recheck_work(struct work_struct *work)
 	 * after a certain delay to recheck the threshold by next runtime
 	 * suspend.
 	 */
-	pm_runtime_get_sync(hba->dev);
-	pm_runtime_put_sync(hba->dev);
+	scsi_autopm_get_device(hba->sdev_ufs_device);
+	scsi_autopm_put_device(hba->sdev_ufs_device);
 }
 
 /**
@@ -5604,7 +5654,6 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
 	u32 status = 0;
 	hba = container_of(work, struct ufs_hba, eeh_work);
 
-	pm_runtime_get_sync(hba->dev);
 	ufshcd_scsi_block_requests(hba);
 	err = ufshcd_get_ee_status(hba, &status);
 	if (err) {
@@ -5621,14 +5670,6 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
 	ufs_debugfs_exception_event(hba, status);
 out:
 	ufshcd_scsi_unblock_requests(hba);
-	/*
-	 * pm_runtime_get_noresume is called while scheduling
-	 * eeh_work to avoid suspend racing with exception work.
-	 * Hence decrement usage counter using pm_runtime_put_noidle
-	 * to allow suspend on completion of exception event handler.
-	 */
-	pm_runtime_put_noidle(hba->dev);
-	pm_runtime_put(hba->dev);
 	return;
 }
 
@@ -5753,12 +5794,13 @@ static void ufshcd_clk_scaling_suspend(struct ufs_hba *hba, bool suspend)
 
 static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
 {
-	pm_runtime_get_sync(hba->dev);
-	if (pm_runtime_status_suspended(hba->dev) || hba->is_sys_suspended) {
+	scsi_autopm_get_device(hba->sdev_ufs_device);
+	if (pm_runtime_status_suspended(&hba->sdev_ufs_device->sdev_gendev) ||
+	    hba->is_sys_suspended) {
 		enum ufs_pm_op pm_op;
 
 		/*
-		 * Don't assume anything of pm_runtime_get_sync(), if
+		 * Don't assume anything of resume, if
 		 * resume fails, irq and clocks can be OFF, and powers
 		 * can be OFF or in LPM.
 		 */
@@ -5794,7 +5836,7 @@ static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
 	if (ufshcd_is_clkscaling_supported(hba))
 		ufshcd_clk_scaling_suspend(hba, false);
 	ufshcd_clear_ua_wluns(hba);
-	pm_runtime_put(hba->dev);
+	pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
 }
 
 static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba)
@@ -5815,14 +5857,14 @@ static void ufshcd_recover_pm_error(struct ufs_hba *hba)
 
 	hba->is_sys_suspended = false;
 	/*
-	 * Set RPM status of hba device to RPM_ACTIVE,
+	 * Set RPM status of wlun device to RPM_ACTIVE,
 	 * this also clears its runtime error.
 	 */
-	ret = pm_runtime_set_active(hba->dev);
+	ret = pm_runtime_set_active(&hba->sdev_ufs_device->sdev_gendev);
 	/*
-	 * If hba device had runtime error, we also need to resume those
-	 * scsi devices under hba in case any of them has failed to be
-	 * resumed due to hba runtime resume failure. This is to unblock
+	 * If wlun device had runtime error, we also need to resume those
+	 * consumer scsi devices in case any of them has failed to be
+	 * resumed due to supplier runtime resume failure. This is to unblock
 	 * blk_queue_enter in case there are bios waiting inside it.
 	 */
 	if (!ret) {
@@ -7246,7 +7288,6 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
 		hba->sdev_ufs_device = NULL;
 		goto out;
 	}
-	ufshcd_blk_pm_runtime_init(hba->sdev_ufs_device);
 	scsi_device_put(hba->sdev_ufs_device);
 
 	hba->sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
@@ -7410,6 +7451,9 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
 		goto out;
 	}
 
+	hba->luns_avail = desc_buf[DEVICE_DESC_PARAM_NUM_LU] +
+		desc_buf[DEVICE_DESC_PARAM_NUM_WLU];
+
 	ufs_fixup_device_setup(hba);
 
 	ufshcd_wb_probe(hba, desc_buf);
@@ -7887,6 +7931,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async)
 	ufshcd_set_ufs_dev_active(hba);
 	ufshcd_force_reset_auto_bkops(hba);
 	hba->wlun_dev_clr_ua = true;
+	hba->wlun_rpmb_clr_ua = true;
 
 	/* Gear up to HS gear if supported */
 	if (hba->max_pwr_info.is_valid) {
@@ -8472,7 +8517,8 @@ static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
 	 * handling context.
 	 */
 	hba->host->eh_noresume = 1;
-	ufshcd_clear_ua_wluns(hba);
+	if (hba->wlun_dev_clr_ua)
+		ufshcd_clear_ua_wlun(hba, UFS_UPIU_UFS_DEVICE_WLUN);
 
 	cmd[4] = pwr_mode << 4;
 
@@ -8647,23 +8693,7 @@ static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba)
 		ufshcd_setup_hba_vreg(hba, true);
 }
 
-/**
- * ufshcd_suspend - helper function for suspend operations
- * @hba: per adapter instance
- * @pm_op: desired low power operation type
- *
- * This function will try to put the UFS device and link into low power
- * mode based on the "rpm_lvl" (Runtime PM level) or "spm_lvl"
- * (System PM level).
- *
- * If this function is called during shutdown, it will make sure that
- * both UFS device and UFS link is powered off.
- *
- * NOTE: UFS device & link must be active before we enter in this function.
- *
- * Returns 0 for success and non-zero for failure
- */
-static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
+static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 {
 	int ret = 0;
 	int check_for_bkops;
@@ -8671,7 +8701,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	enum ufs_dev_pwr_mode req_dev_pwr_mode;
 	enum uic_link_state req_link_state;
 
-	hba->pm_op_in_progress = 1;
+	hba->pm_op_in_progress = true;
 	if (!ufshcd_is_shutdown_pm(pm_op)) {
 		pm_lvl = ufshcd_is_runtime_pm(pm_op) ?
 			 hba->rpm_lvl : hba->spm_lvl;
@@ -8694,17 +8724,17 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 
 	if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
 			req_link_state == UIC_LINK_ACTIVE_STATE) {
-		goto disable_clks;
+		goto enable_scaling;
 	}
 
 	if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
 	    (req_link_state == hba->uic_link_state))
-		goto enable_gating;
+		goto enable_scaling;
 
 	/* UFS device & link must be active before we enter in this function */
 	if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
 		ret = -EINVAL;
-		goto enable_gating;
+		goto enable_scaling;
 	}
 
 	if (ufshcd_is_runtime_pm(pm_op)) {
@@ -8716,7 +8746,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 			 */
 			ret = ufshcd_urgent_bkops(hba);
 			if (ret)
-				goto enable_gating;
+				goto enable_scaling;
 		} else {
 			/* make sure that auto bkops is disabled */
 			ufshcd_disable_auto_bkops(hba);
@@ -8744,7 +8774,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 		if (!hba->dev_info.b_rpm_dev_flush_capable) {
 			ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
 			if (ret)
-				goto enable_gating;
+				goto enable_scaling;
 		}
 	}
 
@@ -8757,7 +8787,6 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	if (ret)
 		goto set_dev_active;
 
-disable_clks:
 	/*
 	 * Call vendor specific suspend callback. As these callbacks may access
 	 * vendor specific host controller register space call them before the
@@ -8766,28 +8795,9 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	ret = ufshcd_vops_suspend(hba, pm_op);
 	if (ret)
 		goto set_link_active;
-	/*
-	 * Disable the host irq as host controller as there won't be any
-	 * host controller transaction expected till resume.
-	 */
-	ufshcd_disable_irq(hba);
-
-	ufshcd_setup_clocks(hba, false);
-
-	if (ufshcd_is_clkgating_allowed(hba)) {
-		hba->clk_gating.state = CLKS_OFF;
-		trace_ufshcd_clk_gating(dev_name(hba->dev),
-					hba->clk_gating.state);
-	}
-
-	ufshcd_vreg_set_lpm(hba);
-
-	/* Put the host controller in low power mode if possible */
-	ufshcd_hba_vreg_set_lpm(hba);
 	goto out;
 
 set_link_active:
-	ufshcd_vreg_set_hpm(hba);
 	/*
 	 * Device hardware reset is required to exit DeepSleep. Also, for
 	 * DeepSleep, the link is off so host reset and restore will be done
@@ -8809,57 +8819,32 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	}
 	if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
 		ufshcd_disable_auto_bkops(hba);
-enable_gating:
+enable_scaling:
 	if (ufshcd_is_clkscaling_supported(hba))
 		ufshcd_clk_scaling_suspend(hba, false);
 
-	hba->clk_gating.is_suspended = false;
 	hba->dev_info.b_rpm_dev_flush_capable = false;
-	ufshcd_clear_ua_wluns(hba);
-	ufshcd_release(hba);
 out:
 	if (hba->dev_info.b_rpm_dev_flush_capable) {
 		schedule_delayed_work(&hba->rpm_dev_flush_recheck_work,
 			msecs_to_jiffies(RPM_DEV_FLUSH_RECHECK_WORK_DELAY_MS));
 	}
 
-	hba->pm_op_in_progress = 0;
-
-	if (ret)
-		ufshcd_update_evt_hist(hba, UFS_EVT_SUSPEND_ERR, (u32)ret);
+	if (ret) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_WL_SUSP_ERR, (u32)ret);
+		hba->clk_gating.is_suspended = false;
+		ufshcd_release(hba);
+	}
+	hba->pm_op_in_progress = false;
 	return ret;
 }
 
-/**
- * ufshcd_resume - helper function for resume operations
- * @hba: per adapter instance
- * @pm_op: runtime PM or system PM
- *
- * This function basically brings the UFS device, UniPro link and controller
- * to active state.
- *
- * Returns 0 for success and non-zero for failure
- */
-static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
+static int __ufshcd_wl_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 {
 	int ret;
-	enum uic_link_state old_link_state;
-
-	hba->pm_op_in_progress = 1;
-	old_link_state = hba->uic_link_state;
-
-	ufshcd_hba_vreg_set_hpm(hba);
-	ret = ufshcd_vreg_set_hpm(hba);
-	if (ret)
-		goto out;
+	enum uic_link_state old_link_state = hba->uic_link_state;
 
-	/* Make sure clocks are enabled before accessing controller */
-	ret = ufshcd_setup_clocks(hba, true);
-	if (ret)
-		goto disable_vreg;
-
-	/* enable the host irq as host controller would be active soon */
-	ufshcd_enable_irq(hba);
+	hba->pm_op_in_progress = true;
 
 	/*
 	 * Call vendor specific resume callback. As these callbacks may access
@@ -8868,7 +8853,7 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	 */
 	ret = ufshcd_vops_resume(hba, pm_op);
 	if (ret)
-		goto disable_irq_and_vops_clks;
+		goto out;
 
 	/* For DeepSleep, the only supported option is to have the link off */
 	WARN_ON(ufshcd_is_ufs_dev_deepsleep(hba) && !ufshcd_is_link_off(hba));
@@ -8916,31 +8901,152 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	if (hba->ee_usr_mask)
 		ufshcd_write_ee_control(hba);
 
-	hba->clk_gating.is_suspended = false;
-
-	if (ufshcd_is_clkscaling_supported(hba))
-		ufshcd_clk_scaling_suspend(hba, false);
-
-	/* Enable Auto-Hibernate if configured */
-	ufshcd_auto_hibern8_enable(hba);
+	if (hba->clk_scaling.is_allowed)
+		ufshcd_resume_clkscaling(hba);
 
 	if (hba->dev_info.b_rpm_dev_flush_capable) {
 		hba->dev_info.b_rpm_dev_flush_capable = false;
 		cancel_delayed_work(&hba->rpm_dev_flush_recheck_work);
 	}
 
-	ufshcd_clear_ua_wluns(hba);
-
-	/* Schedule clock gating in case of no access to UFS device yet */
-	ufshcd_release(hba);
-
+	/* Enable Auto-Hibernate if configured */
+	ufshcd_auto_hibern8_enable(hba);
 	goto out;
 
 set_old_link_state:
 	ufshcd_link_state_transition(hba, old_link_state, 0);
 vendor_suspend:
 	ufshcd_vops_suspend(hba, pm_op);
-disable_irq_and_vops_clks:
+out:
+	if (ret)
+		ufshcd_update_evt_hist(hba, UFS_EVT_WL_RES_ERR, (u32)ret);
+	hba->clk_gating.is_suspended = false;
+	ufshcd_release(hba);
+	hba->pm_op_in_progress = false;
+	return ret;
+}
+
+static int ufshcd_wl_runtime_suspend(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+	int ret;
+	ktime_t start = ktime_get();
+
+	hba = shost_priv(sdev->host);
+
+	ret = __ufshcd_wl_suspend(hba, UFS_RUNTIME_PM);
+	if (ret)
+		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+
+	trace_ufshcd_wl_runtime_suspend(dev_name(dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+	return ret;
+}
+
+static int ufshcd_wl_runtime_resume(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+	int ret = 0;
+	ktime_t start = ktime_get();
+
+	hba = shost_priv(sdev->host);
+
+	ret = __ufshcd_wl_resume(hba, UFS_RUNTIME_PM);
+	if (ret)
+		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+
+	trace_ufshcd_wl_runtime_resume(dev_name(dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+	return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ufshcd_wl_suspend(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+	int ret;
+	ktime_t start = ktime_get();
+
+	hba = shost_priv(sdev->host);
+	ret = __ufshcd_wl_suspend(hba, UFS_SYSTEM_PM);
+	if (ret)
+		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__,  ret);
+
+	trace_ufshcd_wl_suspend(dev_name(dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+	return ret;
+}
+
+static int ufshcd_wl_resume(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+	int ret = 0;
+	ktime_t start = ktime_get();
+
+	if (pm_runtime_suspended(dev))
+		return 0;
+	hba = shost_priv(sdev->host);
+
+	ret = __ufshcd_wl_resume(hba, UFS_SYSTEM_PM);
+	if (ret)
+		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+
+	trace_ufshcd_wl_resume(dev_name(dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+	return ret;
+}
+#endif
+
+static void ufshcd_wl_shutdown(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+
+	hba = shost_priv(sdev->host);
+
+	down(&hba->host_sem);
+	hba->shutting_down = true;
+	up(&hba->host_sem);
+
+	/* Turn on everything while shutting down */
+	scsi_autopm_get_device(sdev);
+	scsi_device_quiesce(sdev);
+	shost_for_each_device(sdev, hba->host) {
+		if (sdev == hba->sdev_ufs_device)
+			continue;
+		scsi_device_quiesce(sdev);
+	}
+	__ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
+}
+
+/**
+ * ufshcd_suspend - helper function for suspend operations
+ * @hba: per adapter instance
+ *
+ * This function will put disable irqs, turn off clocks
+ * and set vreg and hba-vreg in lpm mode.
+ * Also check the description of __ufshcd_wl_suspend().
+ */
+static void ufshcd_suspend(struct ufs_hba *hba)
+{
+	hba->pm_op_in_progress = 1;
+
+	/*
+	 * Disable the host irq as host controller as there won't be any
+	 * host controller transaction expected till resume.
+	 */
 	ufshcd_disable_irq(hba);
 	ufshcd_setup_clocks(hba, false);
 	if (ufshcd_is_clkgating_allowed(hba)) {
@@ -8948,6 +9054,43 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 		trace_ufshcd_clk_gating(dev_name(hba->dev),
 					hba->clk_gating.state);
 	}
+
+	ufshcd_vreg_set_lpm(hba);
+	/* Put the host controller in low power mode if possible */
+	ufshcd_hba_vreg_set_lpm(hba);
+	hba->pm_op_in_progress = 0;
+}
+
+/**
+ * ufshcd_resume - helper function for resume operations
+ * @hba: per adapter instance
+ *
+ * This function basically turns on the regulators, clocks and
+ * irqs of the hba.
+ * Also check the description of __ufshcd_wl_resume().
+ *
+ * Returns 0 for success and non-zero for failure
+ */
+static int ufshcd_resume(struct ufs_hba *hba)
+{
+	int ret;
+
+	hba->pm_op_in_progress = 1;
+
+	ufshcd_hba_vreg_set_hpm(hba);
+	ret = ufshcd_vreg_set_hpm(hba);
+	if (ret)
+		goto out;
+
+	/* Make sure clocks are enabled before accessing controller */
+	ret = ufshcd_setup_clocks(hba, true);
+	if (ret)
+		goto disable_vreg;
+
+	/* enable the host irq as host controller would be active soon */
+	ufshcd_enable_irq(hba);
+	goto out;
+
 disable_vreg:
 	ufshcd_vreg_set_lpm(hba);
 out:
@@ -8962,6 +9105,7 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
  * @hba: per adapter instance
  *
  * Check the description of ufshcd_suspend() function for more details.
+ * Also check the description of __ufshcd_wl_suspend().
  *
  * Returns 0 for success and non-zero for failure
  */
@@ -8982,21 +9126,7 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
 	     !hba->dev_info.b_rpm_dev_flush_capable)
 		goto out;
 
-	if (pm_runtime_suspended(hba->dev)) {
-		/*
-		 * UFS device and/or UFS link low power states during runtime
-		 * suspend seems to be different than what is expected during
-		 * system suspend. Hence runtime resume the devic & link and
-		 * let the system suspend low power states to take effect.
-		 * TODO: If resume takes longer time, we might have optimize
-		 * it in future by not resuming everything if possible.
-		 */
-		ret = ufshcd_runtime_resume(hba);
-		if (ret)
-			goto out;
-	}
-
-	ret = ufshcd_suspend(hba, UFS_SYSTEM_PM);
+	ufshcd_suspend(hba);
 out:
 	trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
 		ktime_to_us(ktime_sub(ktime_get(), start)),
@@ -9018,25 +9148,20 @@ EXPORT_SYMBOL(ufshcd_system_suspend);
 
 int ufshcd_system_resume(struct ufs_hba *hba)
 {
-	int ret = 0;
 	ktime_t start = ktime_get();
 
-	if (!hba->is_powered || pm_runtime_suspended(hba->dev))
-		/*
-		 * Let the runtime resume take care of resuming
-		 * if runtime suspended.
-		 */
+	if (!hba->is_powered)
 		goto out;
 	else
-		ret = ufshcd_resume(hba, UFS_SYSTEM_PM);
+		ufshcd_resume(hba);
 out:
-	trace_ufshcd_system_resume(dev_name(hba->dev), ret,
+	trace_ufshcd_system_resume(dev_name(hba->dev), 0,
 		ktime_to_us(ktime_sub(ktime_get(), start)),
 		hba->curr_dev_pwr_mode, hba->uic_link_state);
-	if (!ret)
-		hba->is_sys_suspended = false;
+
+	hba->is_sys_suspended = false;
 	up(&hba->host_sem);
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL(ufshcd_system_resume);
 
@@ -9045,23 +9170,23 @@ EXPORT_SYMBOL(ufshcd_system_resume);
  * @hba: per adapter instance
  *
  * Check the description of ufshcd_suspend() function for more details.
+ * Also check the description of __ufshcd_wl_suspend().
  *
  * Returns 0 for success and non-zero for failure
  */
 int ufshcd_runtime_suspend(struct ufs_hba *hba)
 {
-	int ret = 0;
 	ktime_t start = ktime_get();
 
 	if (!hba->is_powered)
 		goto out;
 	else
-		ret = ufshcd_suspend(hba, UFS_RUNTIME_PM);
+		ufshcd_suspend(hba);
 out:
-	trace_ufshcd_runtime_suspend(dev_name(hba->dev), ret,
+	trace_ufshcd_runtime_suspend(dev_name(hba->dev), 0,
 		ktime_to_us(ktime_sub(ktime_get(), start)),
 		hba->curr_dev_pwr_mode, hba->uic_link_state);
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL(ufshcd_runtime_suspend);
 
@@ -9069,37 +9194,25 @@ EXPORT_SYMBOL(ufshcd_runtime_suspend);
  * ufshcd_runtime_resume - runtime resume routine
  * @hba: per adapter instance
  *
- * This function basically brings the UFS device, UniPro link and controller
+ * This function basically brings controller
  * to active state. Following operations are done in this function:
  *
  * 1. Turn on all the controller related clocks
- * 2. Bring the UniPro link out of Hibernate state
- * 3. If UFS device is in sleep state, turn ON VCC rail and bring the UFS device
- *    to active state.
- * 4. If auto-bkops is enabled on the device, disable it.
- *
- * So following would be the possible power state after this function return
- * successfully:
- *	S1: UFS device in Active state with VCC rail ON
- *	    UniPro link in Active state
- *	    All the UFS/UniPro controller clocks are ON
- *
- * Returns 0 for success and non-zero for failure
+ * 2. Turn ON VCC rail
  */
 int ufshcd_runtime_resume(struct ufs_hba *hba)
 {
-	int ret = 0;
 	ktime_t start = ktime_get();
 
 	if (!hba->is_powered)
 		goto out;
 	else
-		ret = ufshcd_resume(hba, UFS_RUNTIME_PM);
+		ufshcd_resume(hba);
 out:
-	trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
+	trace_ufshcd_runtime_resume(dev_name(hba->dev), 0,
 		ktime_to_us(ktime_sub(ktime_get(), start)),
 		hba->curr_dev_pwr_mode, hba->uic_link_state);
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL(ufshcd_runtime_resume);
 
@@ -9113,18 +9226,13 @@ EXPORT_SYMBOL(ufshcd_runtime_idle);
  * ufshcd_shutdown - shutdown routine
  * @hba: per adapter instance
  *
- * This function would power off both UFS device and UFS link.
+ * This function would turn off both UFS device and UFS hba
+ * regulators. It would also disable clocks.
  *
  * Returns 0 always to allow force shutdown even in case of errors.
  */
 int ufshcd_shutdown(struct ufs_hba *hba)
 {
-	int ret = 0;
-
-	down(&hba->host_sem);
-	hba->shutting_down = true;
-	up(&hba->host_sem);
-
 	if (!hba->is_powered)
 		goto out;
 
@@ -9133,10 +9241,8 @@ int ufshcd_shutdown(struct ufs_hba *hba)
 
 	pm_runtime_get_sync(hba->dev);
 
-	ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM);
+	ufshcd_suspend(hba);
 out:
-	if (ret)
-		dev_err(hba->dev, "%s failed, err %d\n", __func__, ret);
 	hba->is_powered = false;
 	/* allow force shutdown even in case of errors */
 	return 0;
@@ -9150,6 +9256,8 @@ EXPORT_SYMBOL(ufshcd_shutdown);
  */
 void ufshcd_remove(struct ufs_hba *hba)
 {
+	if (hba->sdev_ufs_device)
+		scsi_autopm_get_device(hba->sdev_ufs_device);
 	ufs_bsg_remove(hba);
 	ufs_sysfs_remove_nodes(hba->dev);
 	blk_cleanup_queue(hba->tmf_queue);
@@ -9453,15 +9561,175 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 }
 EXPORT_SYMBOL_GPL(ufshcd_init);
 
+void ufshcd_resume_complete(struct device *dev)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	pm_runtime_put_noidle(&hba->sdev_ufs_device->sdev_gendev);
+}
+EXPORT_SYMBOL_GPL(ufshcd_resume_complete);
+
+int ufshcd_suspend_prepare(struct device *dev)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	/*
+	 * SCSI assumes that runtime-pm and system-pm for scsi drivers
+	 * are same. And it doesn't wake up the device for system-suspend
+	 * if it's runtime suspended. But ufs doesn't follow that.
+	 * The rpm-lvl and spm-lvl can be different in ufs.
+	 * Force it to honor system-suspend.
+	 */
+	scsi_autopm_get_device(hba->sdev_ufs_device);
+	/* Refer ufshcd_resume_complete() */
+	pm_runtime_get_noresume(&hba->sdev_ufs_device->sdev_gendev);
+	scsi_autopm_put_device(hba->sdev_ufs_device);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ufshcd_suspend_prepare);
+
+#ifdef CONFIG_PM_SLEEP
+static int ufshcd_wl_poweroff(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba = shost_priv(sdev->host);
+
+	__ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
+	return 0;
+}
+#endif
+
+static int ufshcd_wl_probe(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+
+	if (!is_device_wlun(sdev))
+		return -ENODEV;
+
+	blk_pm_runtime_init(sdev->request_queue, dev);
+	pm_runtime_set_autosuspend_delay(dev, 0);
+	pm_runtime_allow(dev);
+
+	return  0;
+}
+
+static int ufshcd_wl_remove(struct device *dev)
+{
+	pm_runtime_forbid(dev);
+	return 0;
+}
+
+static const struct dev_pm_ops ufshcd_wl_pm_ops = {
+#ifdef CONFIG_PM_SLEEP
+	.suspend = ufshcd_wl_suspend,
+	.resume = ufshcd_wl_resume,
+	.freeze = ufshcd_wl_suspend,
+	.thaw = ufshcd_wl_resume,
+	.poweroff = ufshcd_wl_poweroff,
+	.restore = ufshcd_wl_resume,
+#endif
+	SET_RUNTIME_PM_OPS(ufshcd_wl_runtime_suspend, ufshcd_wl_runtime_resume, NULL)
+};
+
+/**
+ * ufs_dev_wlun_template - describes ufs device wlun
+ * ufs-device wlun - used to send pm commands
+ * All luns are consumers of ufs-device wlun.
+ *
+ * Currently, no sd driver is present for wluns.
+ * Hence the no specific pm operations are performed.
+ * With ufs design, SSU should be sent to ufs-device wlun.
+ * Hence register a scsi driver for ufs wluns only.
+ */
+static struct scsi_driver ufs_dev_wlun_template = {
+	.gendrv = {
+		.name = "ufs_device_wlun",
+		.owner = THIS_MODULE,
+		.probe = ufshcd_wl_probe,
+		.remove = ufshcd_wl_remove,
+		.pm = &ufshcd_wl_pm_ops,
+		.shutdown = ufshcd_wl_shutdown,
+	},
+};
+
+static int ufshcd_rpmb_probe(struct device *dev)
+{
+	return is_rpmb_wlun(to_scsi_device(dev)) ? 0 : -ENODEV;
+}
+
+static inline int ufshcd_clear_rpmb_uac(struct ufs_hba *hba)
+{
+	int ret = 0;
+
+	if (!hba->wlun_rpmb_clr_ua)
+		return 0;
+	ret = ufshcd_clear_ua_wlun(hba, UFS_UPIU_RPMB_WLUN);
+	if (!ret)
+		hba->wlun_rpmb_clr_ua = 0;
+	return ret;
+}
+
+static int ufshcd_rpmb_runtime_resume(struct device *dev)
+{
+	struct ufs_hba *hba = wlun_dev_to_hba(dev);
+
+	if (hba->sdev_rpmb)
+		return ufshcd_clear_rpmb_uac(hba);
+	return 0;
+}
+
+static int ufshcd_rpmb_resume(struct device *dev)
+{
+	struct ufs_hba *hba = wlun_dev_to_hba(dev);
+
+	if (hba->sdev_rpmb && !pm_runtime_suspended(dev))
+		return ufshcd_clear_rpmb_uac(hba);
+	return 0;
+}
+
+static const struct dev_pm_ops ufs_rpmb_pm_ops = {
+	SET_RUNTIME_PM_OPS(NULL, ufshcd_rpmb_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(NULL, ufshcd_rpmb_resume)
+};
+
+/**
+ * Describes the ufs rpmb wlun.
+ * Used only to send uac.
+ */
+static struct scsi_driver ufs_rpmb_wlun_template = {
+	.gendrv = {
+		.name = "ufs_rpmb_wlun",
+		.owner = THIS_MODULE,
+		.probe = ufshcd_rpmb_probe,
+		.pm = &ufs_rpmb_pm_ops,
+	},
+};
+
 static int __init ufshcd_core_init(void)
 {
+	int ret;
+
 	ufs_debugfs_init();
+
+	ret = scsi_register_driver(&ufs_dev_wlun_template.gendrv);
+	if (ret) {
+		ufs_debugfs_exit();
+		return ret;
+	}
+	ret = scsi_register_driver(&ufs_rpmb_wlun_template.gendrv);
+	if (ret) {
+		ufs_debugfs_exit();
+		scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
+		return ret;
+	}
 	return 0;
 }
 
 static void __exit ufshcd_core_exit(void)
 {
 	ufs_debugfs_exit();
+	scsi_unregister_driver(&ufs_rpmb_wlun_template.gendrv);
+	scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
 }
 
 module_init(ufshcd_core_init);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 5eb66a8..40436e3 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -72,6 +72,8 @@ enum ufs_event_type {
 	UFS_EVT_LINK_STARTUP_FAIL,
 	UFS_EVT_RESUME_ERR,
 	UFS_EVT_SUSPEND_ERR,
+	UFS_EVT_WL_SUSP_ERR,
+	UFS_EVT_WL_RES_ERR,
 
 	/* abnormal events */
 	UFS_EVT_DEV_RESET,
@@ -807,6 +809,7 @@ struct ufs_hba {
 	struct list_head clk_list_head;
 
 	bool wlun_dev_clr_ua;
+	bool wlun_rpmb_clr_ua;
 
 	/* Number of requests aborts */
 	int req_abort_count;
@@ -846,6 +849,7 @@ struct ufs_hba {
 	struct delayed_work debugfs_ee_work;
 	u32 debugfs_ee_rate_limit_ms;
 #endif
+	u32 luns_avail;
 };
 
 /* Returns true if clocks can be gated. Otherwise false */
@@ -1105,6 +1109,8 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
 			     enum query_opcode desc_op);
 
 int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable);
+int ufshcd_suspend_prepare(struct device *dev);
+void ufshcd_resume_complete(struct device *dev);
 
 /* Wrapper functions for safely calling variant operations */
 static inline const char *ufshcd_get_var_name(struct ufs_hba *hba)
diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h
index 1cb6f1a..599739e 100644
--- a/include/trace/events/ufs.h
+++ b/include/trace/events/ufs.h
@@ -246,6 +246,26 @@ DEFINE_EVENT(ufshcd_template, ufshcd_init,
 		      int dev_state, int link_state),
 	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
 
+DEFINE_EVENT(ufshcd_template, ufshcd_wl_suspend,
+	     TP_PROTO(const char *dev_name, int err, s64 usecs,
+		      int dev_state, int link_state),
+	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+
+DEFINE_EVENT(ufshcd_template, ufshcd_wl_resume,
+	     TP_PROTO(const char *dev_name, int err, s64 usecs,
+		      int dev_state, int link_state),
+	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+
+DEFINE_EVENT(ufshcd_template, ufshcd_wl_runtime_suspend,
+	     TP_PROTO(const char *dev_name, int err, s64 usecs,
+		      int dev_state, int link_state),
+	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+
+DEFINE_EVENT(ufshcd_template, ufshcd_wl_runtime_resume,
+	     TP_PROTO(const char *dev_name, int err, s64 usecs,
+		      int dev_state, int link_state),
+	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
+
 TRACE_EVENT(ufshcd_command,
 	TP_PROTO(const char *dev_name, enum ufs_trace_str_t str_t,
 		 unsigned int tag, u32 doorbell, int transfer_len, u32 intr,
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.

Re: [PATCH v17 1/2] scsi: ufs: Enable power management for wlun

[Adrian Hunter]

On 8/04/21 5:49 pm, Asutosh Das wrote:
> During runtime-suspend of ufs host, the scsi devices are
> already suspended and so are the queues associated with them.
> But the ufs host sends SSU (START_STOP_UNIT) to wlun
> during its runtime-suspend.
> During the process blk_queue_enter checks if the queue is not in
> suspended state. If so, it waits for the queue to resume, and never
> comes out of it.
> The commit
> (d55d15a33: scsi: block: Do not accept any requests while suspended)
> adds the check if the queue is in suspended state in blk_queue_enter().
> 
> Call trace:
>  __switch_to+0x174/0x2c4
>  __schedule+0x478/0x764
>  schedule+0x9c/0xe0
>  blk_queue_enter+0x158/0x228
>  blk_mq_alloc_request+0x40/0xa4
>  blk_get_request+0x2c/0x70
>  __scsi_execute+0x60/0x1c4
>  ufshcd_set_dev_pwr_mode+0x124/0x1e4
>  ufshcd_suspend+0x208/0x83c
>  ufshcd_runtime_suspend+0x40/0x154
>  ufshcd_pltfrm_runtime_suspend+0x14/0x20
>  pm_generic_runtime_suspend+0x28/0x3c
>  __rpm_callback+0x80/0x2a4
>  rpm_suspend+0x308/0x614
>  rpm_idle+0x158/0x228
>  pm_runtime_work+0x84/0xac
>  process_one_work+0x1f0/0x470
>  worker_thread+0x26c/0x4c8
>  kthread+0x13c/0x320
>  ret_from_fork+0x10/0x18
> 
> Fix this by registering ufs device wlun as a scsi driver and
> registering it for block runtime-pm. Also make this as a
> supplier for all other luns. That way, this device wlun
> suspends after all the consumers and resumes after
> hba resumes.
> 
> Co-developed-by: Can Guo <cang@codeaurora.org>
> Signed-off-by: Can Guo <cang@codeaurora.org>
> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
> ---

<SNIP>

> @@ -5815,14 +5857,14 @@ static void ufshcd_recover_pm_error(struct ufs_hba *hba)
>  
>  	hba->is_sys_suspended = false;
>  	/*
> -	 * Set RPM status of hba device to RPM_ACTIVE,
> +	 * Set RPM status of wlun device to RPM_ACTIVE,
>  	 * this also clears its runtime error.
>  	 */
> -	ret = pm_runtime_set_active(hba->dev);
> +	ret = pm_runtime_set_active(&hba->sdev_ufs_device->sdev_gendev);

It may be that it was hba->dev with a runtime error. So,
also need here:

	if (ret)
		ret = pm_runtime_set_active(hba->dev);


> @@ -8671,7 +8701,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>  	enum ufs_dev_pwr_mode req_dev_pwr_mode;
>  	enum uic_link_state req_link_state;
>  
> -	hba->pm_op_in_progress = 1;
> +	hba->pm_op_in_progress = true;
>  	if (!ufshcd_is_shutdown_pm(pm_op)) {
>  		pm_lvl = ufshcd_is_runtime_pm(pm_op) ?
>  			 hba->rpm_lvl : hba->spm_lvl;
> @@ -8694,17 +8724,17 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>  
>  	if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
>  			req_link_state == UIC_LINK_ACTIVE_STATE) {
> -		goto disable_clks;
> +		goto enable_scaling;

Previously "goto disable_clks" would go to the vendor callback
ufshcd_vops_suspend(), but now it is skipped.


>  	}
>  
>  	if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
>  	    (req_link_state == hba->uic_link_state))
> -		goto enable_gating;
> +		goto enable_scaling;
>  
>  	/* UFS device & link must be active before we enter in this function */
>  	if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
>  		ret = -EINVAL;
> -		goto enable_gating;
> +		goto enable_scaling;
>  	}

<SNIP>

> +/**
> + * ufshcd_suspend - helper function for suspend operations
> + * @hba: per adapter instance
> + *
> + * This function will put disable irqs, turn off clocks
> + * and set vreg and hba-vreg in lpm mode.
> + * Also check the description of __ufshcd_wl_suspend().
> + */
> +static void ufshcd_suspend(struct ufs_hba *hba)
> +{
> +	hba->pm_op_in_progress = 1;

Seems like pm_op_in_progress wouldn't be needed in this function,
nor ufshcd_resume().

You could probably simplify the callers slighly by
putting the "if (!hbs->is_powered) return" check here and in
ufshcd_resume().

> +
> +	/*
> +	 * Disable the host irq as host controller as there won't be any
> +	 * host controller transaction expected till resume.
> +	 */
>  	ufshcd_disable_irq(hba);
>  	ufshcd_setup_clocks(hba, false);
>  	if (ufshcd_is_clkgating_allowed(hba)) {
> @@ -8948,6 +9054,43 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>  		trace_ufshcd_clk_gating(dev_name(hba->dev),
>  					hba->clk_gating.state);
>  	}
> +
> +	ufshcd_vreg_set_lpm(hba);
> +	/* Put the host controller in low power mode if possible */
> +	ufshcd_hba_vreg_set_lpm(hba);
> +	hba->pm_op_in_progress = 0;
> +}
> +
> +/**
> + * ufshcd_resume - helper function for resume operations
> + * @hba: per adapter instance
> + *
> + * This function basically turns on the regulators, clocks and
> + * irqs of the hba.
> + * Also check the description of __ufshcd_wl_resume().
> + *
> + * Returns 0 for success and non-zero for failure
> + */
> +static int ufshcd_resume(struct ufs_hba *hba)
> +{
> +	int ret;
> +
> +	hba->pm_op_in_progress = 1;
> +
> +	ufshcd_hba_vreg_set_hpm(hba);
> +	ret = ufshcd_vreg_set_hpm(hba);
> +	if (ret)
> +		goto out;
> +
> +	/* Make sure clocks are enabled before accessing controller */
> +	ret = ufshcd_setup_clocks(hba, true);
> +	if (ret)
> +		goto disable_vreg;
> +
> +	/* enable the host irq as host controller would be active soon */
> +	ufshcd_enable_irq(hba);
> +	goto out;
> +
>  disable_vreg:
>  	ufshcd_vreg_set_lpm(hba);
>  out:
> @@ -8962,6 +9105,7 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>   * @hba: per adapter instance
>   *
>   * Check the description of ufshcd_suspend() function for more details.
> + * Also check the description of __ufshcd_wl_suspend().
>   *
>   * Returns 0 for success and non-zero for failure
>   */
> @@ -8982,21 +9126,7 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
>	if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
>	     hba->curr_dev_pwr_mode) &&
>	    (ufs_get_pm_lvl_to_link_pwr_state(hba->spm_lvl) ==
>	     hba->uic_link_state) &&
>  	     !hba->dev_info.b_rpm_dev_flush_capable)
>  		goto out;

The logic above can be removed.

>  
> -	if (pm_runtime_suspended(hba->dev)) {
> -		/*
> -		 * UFS device and/or UFS link low power states during runtime
> -		 * suspend seems to be different than what is expected during
> -		 * system suspend. Hence runtime resume the devic & link and
> -		 * let the system suspend low power states to take effect.
> -		 * TODO: If resume takes longer time, we might have optimize
> -		 * it in future by not resuming everything if possible.
> -		 */
> -		ret = ufshcd_runtime_resume(hba);
> -		if (ret)
> -			goto out;
> -	}

System suspend/resume and runtime suspend/resume are identical
for hba->dev, so the logic becomes:

	if (pm_runtime_suspended(hba->dev))
		goto out;

> -
> -	ret = ufshcd_suspend(hba, UFS_SYSTEM_PM);
> +	ufshcd_suspend(hba);
>  out:
>  	trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
>  		ktime_to_us(ktime_sub(ktime_get(), start)),
> @@ -9018,25 +9148,20 @@ EXPORT_SYMBOL(ufshcd_system_suspend);
>  
>  int ufshcd_system_resume(struct ufs_hba *hba)
>  {
> -	int ret = 0;
>  	ktime_t start = ktime_get();
>  
> -	if (!hba->is_powered || pm_runtime_suspended(hba->dev))
> -		/*
> -		 * Let the runtime resume take care of resuming
> -		 * if runtime suspended.
> -		 */
> +	if (!hba->is_powered)

System suspend/resume and runtime suspend/resume are identical
for hba->dev, so the original logic is fine here.

>  		goto out;
>  	else
> -		ret = ufshcd_resume(hba, UFS_SYSTEM_PM);
> +		ufshcd_resume(hba);
>  out:
> -	trace_ufshcd_system_resume(dev_name(hba->dev), ret,
> +	trace_ufshcd_system_resume(dev_name(hba->dev), 0,
>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
> -	if (!ret)
> -		hba->is_sys_suspended = false;
> +
> +	hba->is_sys_suspended = false;
>  	up(&hba->host_sem);

It seems likely that hba->host_sem down / up should be in 
ufshcd_wl_suspend() / ufshcd_wl_resume() respectively, instead
of here.

Ditto hba->is_sys_suspended

> -	return ret;
> +	return 0;
>  }
>  EXPORT_SYMBOL(ufshcd_system_resume);
>  
> @@ -9045,23 +9170,23 @@ EXPORT_SYMBOL(ufshcd_system_resume);
>   * @hba: per adapter instance
>   *
>   * Check the description of ufshcd_suspend() function for more details.
> + * Also check the description of __ufshcd_wl_suspend().
>   *
>   * Returns 0 for success and non-zero for failure
>   */
>  int ufshcd_runtime_suspend(struct ufs_hba *hba)
>  {
> -	int ret = 0;
>  	ktime_t start = ktime_get();
>  
>  	if (!hba->is_powered)
>  		goto out;
>  	else
> -		ret = ufshcd_suspend(hba, UFS_RUNTIME_PM);
> +		ufshcd_suspend(hba);
>  out:
> -	trace_ufshcd_runtime_suspend(dev_name(hba->dev), ret,
> +	trace_ufshcd_runtime_suspend(dev_name(hba->dev), 0,
>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
> -	return ret;
> +	return 0;
>  }
>  EXPORT_SYMBOL(ufshcd_runtime_suspend);
>  
> @@ -9069,37 +9194,25 @@ EXPORT_SYMBOL(ufshcd_runtime_suspend);
>   * ufshcd_runtime_resume - runtime resume routine
>   * @hba: per adapter instance
>   *
> - * This function basically brings the UFS device, UniPro link and controller
> + * This function basically brings controller
>   * to active state. Following operations are done in this function:
>   *
>   * 1. Turn on all the controller related clocks
> - * 2. Bring the UniPro link out of Hibernate state
> - * 3. If UFS device is in sleep state, turn ON VCC rail and bring the UFS device
> - *    to active state.
> - * 4. If auto-bkops is enabled on the device, disable it.
> - *
> - * So following would be the possible power state after this function return
> - * successfully:
> - *	S1: UFS device in Active state with VCC rail ON
> - *	    UniPro link in Active state
> - *	    All the UFS/UniPro controller clocks are ON
> - *
> - * Returns 0 for success and non-zero for failure
> + * 2. Turn ON VCC rail
>   */
>  int ufshcd_runtime_resume(struct ufs_hba *hba)
>  {
> -	int ret = 0;
>  	ktime_t start = ktime_get();
>  
>  	if (!hba->is_powered)
>  		goto out;
>  	else
> -		ret = ufshcd_resume(hba, UFS_RUNTIME_PM);
> +		ufshcd_resume(hba);
>  out:
> -	trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
> +	trace_ufshcd_runtime_resume(dev_name(hba->dev), 0,
>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
> -	return ret;
> +	return 0;
>  }
>  EXPORT_SYMBOL(ufshcd_runtime_resume);
>  
> @@ -9113,18 +9226,13 @@ EXPORT_SYMBOL(ufshcd_runtime_idle);
>   * ufshcd_shutdown - shutdown routine
>   * @hba: per adapter instance
>   *
> - * This function would power off both UFS device and UFS link.
> + * This function would turn off both UFS device and UFS hba
> + * regulators. It would also disable clocks.
>   *
>   * Returns 0 always to allow force shutdown even in case of errors.
>   */
>  int ufshcd_shutdown(struct ufs_hba *hba)
>  {
> -	int ret = 0;
> -
> -	down(&hba->host_sem);
> -	hba->shutting_down = true;
> -	up(&hba->host_sem);
> -
>  	if (!hba->is_powered)
>  		goto out;
>  
> @@ -9133,10 +9241,8 @@ int ufshcd_shutdown(struct ufs_hba *hba)
>  
>  	pm_runtime_get_sync(hba->dev);
>  
> -	ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM);
> +	ufshcd_suspend(hba);
>  out:
> -	if (ret)
> -		dev_err(hba->dev, "%s failed, err %d\n", __func__, ret);
>  	hba->is_powered = false;
>  	/* allow force shutdown even in case of errors */
>  	return 0;
> @@ -9150,6 +9256,8 @@ EXPORT_SYMBOL(ufshcd_shutdown);
>   */
>  void ufshcd_remove(struct ufs_hba *hba)
>  {
> +	if (hba->sdev_ufs_device)
> +		scsi_autopm_get_device(hba->sdev_ufs_device);
>  	ufs_bsg_remove(hba);
>  	ufs_sysfs_remove_nodes(hba->dev);
>  	blk_cleanup_queue(hba->tmf_queue);
> @@ -9453,15 +9561,175 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
>  }
>  EXPORT_SYMBOL_GPL(ufshcd_init);
>  
> +void ufshcd_resume_complete(struct device *dev)
> +{
> +	struct ufs_hba *hba = dev_get_drvdata(dev);
> +
> +	pm_runtime_put_noidle(&hba->sdev_ufs_device->sdev_gendev);

pm_runtime_put() instead of pm_runtime_put_noidle() would be
more correct here.

> +}
> +EXPORT_SYMBOL_GPL(ufshcd_resume_complete);
> +
> +int ufshcd_suspend_prepare(struct device *dev)
> +{
> +	struct ufs_hba *hba = dev_get_drvdata(dev);
> +
> +	/*
> +	 * SCSI assumes that runtime-pm and system-pm for scsi drivers
> +	 * are same. And it doesn't wake up the device for system-suspend
> +	 * if it's runtime suspended. But ufs doesn't follow that.
> +	 * The rpm-lvl and spm-lvl can be different in ufs.
> +	 * Force it to honor system-suspend.
> +	 */
> +	scsi_autopm_get_device(hba->sdev_ufs_device);
> +	/* Refer ufshcd_resume_complete() */
> +	pm_runtime_get_noresume(&hba->sdev_ufs_device->sdev_gendev);
> +	scsi_autopm_put_device(hba->sdev_ufs_device);

This could simply be:

	pm_runtime_get_sync(&hba->sdev_ufs_device->sdev_gendev);

or new wrapper.

> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_suspend_prepare);
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int ufshcd_wl_poweroff(struct device *dev)
> +{
> +	struct scsi_device *sdev = to_scsi_device(dev);
> +	struct ufs_hba *hba = shost_priv(sdev->host);
> +
> +	__ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
> +	return 0;
> +}
> +#endif
> +
> +static int ufshcd_wl_probe(struct device *dev)
> +{
> +	struct scsi_device *sdev = to_scsi_device(dev);
> +
> +	if (!is_device_wlun(sdev))
> +		return -ENODEV;
> +
> +	blk_pm_runtime_init(sdev->request_queue, dev);
> +	pm_runtime_set_autosuspend_delay(dev, 0);
> +	pm_runtime_allow(dev);
> +
> +	return  0;
> +}
> +
> +static int ufshcd_wl_remove(struct device *dev)
> +{
> +	pm_runtime_forbid(dev);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops ufshcd_wl_pm_ops = {
> +#ifdef CONFIG_PM_SLEEP
> +	.suspend = ufshcd_wl_suspend,
> +	.resume = ufshcd_wl_resume,
> +	.freeze = ufshcd_wl_suspend,
> +	.thaw = ufshcd_wl_resume,
> +	.poweroff = ufshcd_wl_poweroff,
> +	.restore = ufshcd_wl_resume,
> +#endif
> +	SET_RUNTIME_PM_OPS(ufshcd_wl_runtime_suspend, ufshcd_wl_runtime_resume, NULL)
> +};
> +
> +/**
> + * ufs_dev_wlun_template - describes ufs device wlun
> + * ufs-device wlun - used to send pm commands
> + * All luns are consumers of ufs-device wlun.
> + *
> + * Currently, no sd driver is present for wluns.
> + * Hence the no specific pm operations are performed.
> + * With ufs design, SSU should be sent to ufs-device wlun.
> + * Hence register a scsi driver for ufs wluns only.
> + */
> +static struct scsi_driver ufs_dev_wlun_template = {
> +	.gendrv = {
> +		.name = "ufs_device_wlun",
> +		.owner = THIS_MODULE,
> +		.probe = ufshcd_wl_probe,
> +		.remove = ufshcd_wl_remove,
> +		.pm = &ufshcd_wl_pm_ops,
> +		.shutdown = ufshcd_wl_shutdown,
> +	},
> +};
> +
> +static int ufshcd_rpmb_probe(struct device *dev)
> +{
> +	return is_rpmb_wlun(to_scsi_device(dev)) ? 0 : -ENODEV;
> +}
> +
> +static inline int ufshcd_clear_rpmb_uac(struct ufs_hba *hba)
> +{
> +	int ret = 0;
> +
> +	if (!hba->wlun_rpmb_clr_ua)
> +		return 0;
> +	ret = ufshcd_clear_ua_wlun(hba, UFS_UPIU_RPMB_WLUN);
> +	if (!ret)
> +		hba->wlun_rpmb_clr_ua = 0;
> +	return ret;
> +}
> +
> +static int ufshcd_rpmb_runtime_resume(struct device *dev)
> +{
> +	struct ufs_hba *hba = wlun_dev_to_hba(dev);
> +
> +	if (hba->sdev_rpmb)
> +		return ufshcd_clear_rpmb_uac(hba);
> +	return 0;
> +}
> +
> +static int ufshcd_rpmb_resume(struct device *dev)
> +{
> +	struct ufs_hba *hba = wlun_dev_to_hba(dev);
> +
> +	if (hba->sdev_rpmb && !pm_runtime_suspended(dev))
> +		return ufshcd_clear_rpmb_uac(hba);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops ufs_rpmb_pm_ops = {
> +	SET_RUNTIME_PM_OPS(NULL, ufshcd_rpmb_runtime_resume, NULL)
> +	SET_SYSTEM_SLEEP_PM_OPS(NULL, ufshcd_rpmb_resume)
> +};
> +
> +/**
> + * Describes the ufs rpmb wlun.
> + * Used only to send uac.
> + */
> +static struct scsi_driver ufs_rpmb_wlun_template = {
> +	.gendrv = {
> +		.name = "ufs_rpmb_wlun",
> +		.owner = THIS_MODULE,
> +		.probe = ufshcd_rpmb_probe,
> +		.pm = &ufs_rpmb_pm_ops,
> +	},
> +};
> +
>  static int __init ufshcd_core_init(void)
>  {
> +	int ret;
> +
>  	ufs_debugfs_init();
> +
> +	ret = scsi_register_driver(&ufs_dev_wlun_template.gendrv);
> +	if (ret) {
> +		ufs_debugfs_exit();
> +		return ret;
> +	}
> +	ret = scsi_register_driver(&ufs_rpmb_wlun_template.gendrv);
> +	if (ret) {
> +		ufs_debugfs_exit();
> +		scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
> +		return ret;
> +	}
>  	return 0;

A separated error path is preferred i.e.

	ret = scsi_register_driver(&ufs_dev_wlun_template.gendrv);
	if (ret)
		goto debugfs_exit;

	ret = scsi_register_driver(&ufs_rpmb_wlun_template.gendrv);
	if (ret)
		goto unregister;

  	return 0;

unregister:
	scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
debugfs_exit:
	ufs_debugfs_exit();
	return ret;

>  }
>  
>  static void __exit ufshcd_core_exit(void)
>  {
>  	ufs_debugfs_exit();
> +	scsi_unregister_driver(&ufs_rpmb_wlun_template.gendrv);
> +	scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
>  }
>  
>  module_init(ufshcd_core_init);
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 5eb66a8..40436e3 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -72,6 +72,8 @@ enum ufs_event_type {
>  	UFS_EVT_LINK_STARTUP_FAIL,
>  	UFS_EVT_RESUME_ERR,
>  	UFS_EVT_SUSPEND_ERR,
> +	UFS_EVT_WL_SUSP_ERR,
> +	UFS_EVT_WL_RES_ERR,
>  
>  	/* abnormal events */
>  	UFS_EVT_DEV_RESET,
> @@ -807,6 +809,7 @@ struct ufs_hba {
>  	struct list_head clk_list_head;
>  
>  	bool wlun_dev_clr_ua;
> +	bool wlun_rpmb_clr_ua;
>  
>  	/* Number of requests aborts */
>  	int req_abort_count;
> @@ -846,6 +849,7 @@ struct ufs_hba {
>  	struct delayed_work debugfs_ee_work;
>  	u32 debugfs_ee_rate_limit_ms;
>  #endif
> +	u32 luns_avail;
>  };
>  
>  /* Returns true if clocks can be gated. Otherwise false */
> @@ -1105,6 +1109,8 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
>  			     enum query_opcode desc_op);
>  
>  int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable);
> +int ufshcd_suspend_prepare(struct device *dev);
> +void ufshcd_resume_complete(struct device *dev);
>  
>  /* Wrapper functions for safely calling variant operations */
>  static inline const char *ufshcd_get_var_name(struct ufs_hba *hba)
> diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h
> index 1cb6f1a..599739e 100644
> --- a/include/trace/events/ufs.h
> +++ b/include/trace/events/ufs.h
> @@ -246,6 +246,26 @@ DEFINE_EVENT(ufshcd_template, ufshcd_init,
>  		      int dev_state, int link_state),
>  	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
>  
> +DEFINE_EVENT(ufshcd_template, ufshcd_wl_suspend,
> +	     TP_PROTO(const char *dev_name, int err, s64 usecs,
> +		      int dev_state, int link_state),
> +	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
> +
> +DEFINE_EVENT(ufshcd_template, ufshcd_wl_resume,
> +	     TP_PROTO(const char *dev_name, int err, s64 usecs,
> +		      int dev_state, int link_state),
> +	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
> +
> +DEFINE_EVENT(ufshcd_template, ufshcd_wl_runtime_suspend,
> +	     TP_PROTO(const char *dev_name, int err, s64 usecs,
> +		      int dev_state, int link_state),
> +	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
> +
> +DEFINE_EVENT(ufshcd_template, ufshcd_wl_runtime_resume,
> +	     TP_PROTO(const char *dev_name, int err, s64 usecs,
> +		      int dev_state, int link_state),
> +	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
> +
>  TRACE_EVENT(ufshcd_command,
>  	TP_PROTO(const char *dev_name, enum ufs_trace_str_t str_t,
>  		 unsigned int tag, u32 doorbell, int transfer_len, u32 intr,
> 

[PATCH v17 2/2] ufs: sysfs: Resume the proper scsi device

[Asutosh Das]

Resumes the actual scsi device the unit descriptor of which
is being accessed instead of the hba alone.

Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
 drivers/scsi/ufs/ufs-sysfs.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index d7c3cff..fa57bac 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -245,9 +245,9 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr,
 		goto out;
 	}
 
-	pm_runtime_get_sync(hba->dev);
+	scsi_autopm_get_device(hba->sdev_ufs_device);
 	res = ufshcd_wb_toggle(hba, wb_enable);
-	pm_runtime_put_sync(hba->dev);
+	scsi_autopm_put_device(hba->sdev_ufs_device);
 out:
 	up(&hba->host_sem);
 	return res < 0 ? res : count;
@@ -297,10 +297,10 @@ static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba,
 		goto out;
 	}
 
-	pm_runtime_get_sync(hba->dev);
+	scsi_autopm_get_device(hba->sdev_ufs_device);
 	ret = ufshcd_read_desc_param(hba, desc_id, desc_index,
 				param_offset, desc_buf, param_size);
-	pm_runtime_put_sync(hba->dev);
+	scsi_autopm_put_device(hba->sdev_ufs_device);
 	if (ret) {
 		ret = -EINVAL;
 		goto out;
@@ -678,7 +678,7 @@ static ssize_t _name##_show(struct device *dev,				\
 		up(&hba->host_sem);					\
 		return -ENOMEM;						\
 	}								\
-	pm_runtime_get_sync(hba->dev);					\
+	scsi_autopm_get_device(hba->sdev_ufs_device);			\
 	ret = ufshcd_query_descriptor_retry(hba,			\
 		UPIU_QUERY_OPCODE_READ_DESC, QUERY_DESC_IDN_DEVICE,	\
 		0, 0, desc_buf, &desc_len);				\
@@ -695,7 +695,7 @@ static ssize_t _name##_show(struct device *dev,				\
 		goto out;						\
 	ret = sysfs_emit(buf, "%s\n", desc_buf);			\
 out:									\
-	pm_runtime_put_sync(hba->dev);					\
+	scsi_autopm_put_device(hba->sdev_ufs_device);			\
 	kfree(desc_buf);						\
 	up(&hba->host_sem);						\
 	return ret;							\
@@ -744,10 +744,10 @@ static ssize_t _name##_show(struct device *dev,				\
 	}								\
 	if (ufshcd_is_wb_flags(QUERY_FLAG_IDN##_uname))			\
 		index = ufshcd_wb_get_query_index(hba);			\
-	pm_runtime_get_sync(hba->dev);					\
+	scsi_autopm_get_device(hba->sdev_ufs_device);			\
 	ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,	\
 		QUERY_FLAG_IDN##_uname, index, &flag);			\
-	pm_runtime_put_sync(hba->dev);					\
+	scsi_autopm_put_device(hba->sdev_ufs_device);			\
 	if (ret) {							\
 		ret = -EINVAL;						\
 		goto out;						\
@@ -813,10 +813,10 @@ static ssize_t _name##_show(struct device *dev,				\
 	}								\
 	if (ufshcd_is_wb_attrs(QUERY_ATTR_IDN##_uname))			\
 		index = ufshcd_wb_get_query_index(hba);			\
-	pm_runtime_get_sync(hba->dev);					\
+	scsi_autopm_get_device(hba->sdev_ufs_device);			\
 	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,	\
 		QUERY_ATTR_IDN##_uname, index, 0, &value);		\
-	pm_runtime_put_sync(hba->dev);					\
+	scsi_autopm_put_device(hba->sdev_ufs_device);			\
 	if (ret) {							\
 		ret = -EINVAL;						\
 		goto out;						\
@@ -899,11 +899,15 @@ static ssize_t _pname##_show(struct device *dev,			\
 	struct scsi_device *sdev = to_scsi_device(dev);			\
 	struct ufs_hba *hba = shost_priv(sdev->host);			\
 	u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun);			\
+	int ret;							\
 	if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun,		\
 				_duname##_DESC_PARAM##_puname))		\
 		return -EINVAL;						\
-	return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname,	\
+	scsi_autopm_get_device(sdev);					\
+	ret = ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname,	\
 		lun, _duname##_DESC_PARAM##_puname, buf, _size);	\
+	scsi_autopm_put_device(sdev);					\
+	return ret;							\
 }									\
 static DEVICE_ATTR_RO(_pname)
 
@@ -964,10 +968,10 @@ static ssize_t dyn_cap_needed_attribute_show(struct device *dev,
 		goto out;
 	}
 
-	pm_runtime_get_sync(hba->dev);
+	scsi_autopm_get_device(hba->sdev_ufs_device);
 	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
 		QUERY_ATTR_IDN_DYN_CAP_NEEDED, lun, 0, &value);
-	pm_runtime_put_sync(hba->dev);
+	scsi_autopm_put_device(hba->sdev_ufs_device);
 	if (ret) {
 		ret = -EINVAL;
 		goto out;
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.

Re: [PATCH v17 2/2] ufs: sysfs: Resume the proper scsi device

[Adrian Hunter]

On 8/04/21 5:49 pm, Asutosh Das wrote:
> Resumes the actual scsi device the unit descriptor of which
> is being accessed instead of the hba alone.
> 
> Reviewed-by: Can Guo <cang@codeaurora.org>
> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
> ---
>  drivers/scsi/ufs/ufs-sysfs.c | 30 +++++++++++++++++-------------
>  1 file changed, 17 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
> index d7c3cff..fa57bac 100644
> --- a/drivers/scsi/ufs/ufs-sysfs.c
> +++ b/drivers/scsi/ufs/ufs-sysfs.c

<SNIP>

> @@ -899,11 +899,15 @@ static ssize_t _pname##_show(struct device *dev,			\
>  	struct scsi_device *sdev = to_scsi_device(dev);			\
>  	struct ufs_hba *hba = shost_priv(sdev->host);			\
>  	u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun);			\
> +	int ret;							\
>  	if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun,		\
>  				_duname##_DESC_PARAM##_puname))		\
>  		return -EINVAL;						\
> -	return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname,	\
> +	scsi_autopm_get_device(sdev);					\
> +	ret = ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname,	\
>  		lun, _duname##_DESC_PARAM##_puname, buf, _size);	\
> +	scsi_autopm_put_device(sdev);					\
> +	return ret;							\

I am not sure why this change is needed.  It it is needed, please add
a comment explaining.

RE: [PATCH v17 1/2] scsi: ufs: Enable power management for wlun

[Daejun Park]

Hi Asutosh Das,

>During runtime-suspend of ufs host, the scsi devices are
>already suspended and so are the queues associated with them.
>But the ufs host sends SSU (START_STOP_UNIT) to wlun
>during its runtime-suspend.
>During the process blk_queue_enter checks if the queue is not in
>suspended state. If so, it waits for the queue to resume, and never
>comes out of it.
>The commit
>(d55d15a33: scsi: block: Do not accept any requests while suspended)
>adds the check if the queue is in suspended state in blk_queue_enter().
> 
>Call trace:
> __switch_to+0x174/0x2c4
> __schedule+0x478/0x764
> schedule+0x9c/0xe0
> blk_queue_enter+0x158/0x228
> blk_mq_alloc_request+0x40/0xa4
> blk_get_request+0x2c/0x70
> __scsi_execute+0x60/0x1c4
> ufshcd_set_dev_pwr_mode+0x124/0x1e4
> ufshcd_suspend+0x208/0x83c
> ufshcd_runtime_suspend+0x40/0x154
> ufshcd_pltfrm_runtime_suspend+0x14/0x20
> pm_generic_runtime_suspend+0x28/0x3c
> __rpm_callback+0x80/0x2a4
> rpm_suspend+0x308/0x614
> rpm_idle+0x158/0x228
> pm_runtime_work+0x84/0xac
> process_one_work+0x1f0/0x470
> worker_thread+0x26c/0x4c8
> kthread+0x13c/0x320
> ret_from_fork+0x10/0x18
> 
>Fix this by registering ufs device wlun as a scsi driver and
>registering it for block runtime-pm. Also make this as a
>supplier for all other luns. That way, this device wlun
>suspends after all the consumers and resumes after
>hba resumes.
> 
>Co-developed-by: Can Guo <cang@codeaurora.org>
>Signed-off-by: Can Guo <cang@codeaurora.org>
>Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
>---
> drivers/scsi/ufs/cdns-pltfrm.c     |   2 +
> drivers/scsi/ufs/tc-dwc-g210-pci.c |   2 +
> drivers/scsi/ufs/ufs-debugfs.c     |   6 +-
> drivers/scsi/ufs/ufs-debugfs.h     |   2 +-
> drivers/scsi/ufs/ufs-exynos.c      |   2 +
> drivers/scsi/ufs/ufs-hisi.c        |   2 +
> drivers/scsi/ufs/ufs-mediatek.c    |  12 +-
> drivers/scsi/ufs/ufs-qcom.c        |   2 +
> drivers/scsi/ufs/ufs_bsg.c         |   6 +-
> drivers/scsi/ufs/ufshcd-pci.c      |  36 +--
> drivers/scsi/ufs/ufshcd.c          | 642 ++++++++++++++++++++++++++-----------
> drivers/scsi/ufs/ufshcd.h          |   6 +
> include/trace/events/ufs.h         |  20 ++
> 13 files changed, 509 insertions(+), 231 deletions(-)

In this patch, you changed pm_runtime_{get, put}_sync to scsi_autopm_{get, put}_device.
But, scsi_autopm_get_device() calls pm_runtime_put_sync() in case of error
of pm_runtime_get_sync(). So, pm_runtime_put_sync() can be called twice if
scsi_autopm_get_device has error.

Thanks,
Daejun

Re: [PATCH v17 1/2] scsi: ufs: Enable power management for wlun

[Adrian Hunter]

On 9/04/21 5:27 am, Daejun Park wrote:
> Hi Asutosh Das,
> 
>> During runtime-suspend of ufs host, the scsi devices are
>> already suspended and so are the queues associated with them.
>> But the ufs host sends SSU (START_STOP_UNIT) to wlun
>> during its runtime-suspend.
>> During the process blk_queue_enter checks if the queue is not in
>> suspended state. If so, it waits for the queue to resume, and never
>> comes out of it.
>> The commit
>> (d55d15a33: scsi: block: Do not accept any requests while suspended)
>> adds the check if the queue is in suspended state in blk_queue_enter().
>>
>> Call trace:
>> __switch_to+0x174/0x2c4
>> __schedule+0x478/0x764
>> schedule+0x9c/0xe0
>> blk_queue_enter+0x158/0x228
>> blk_mq_alloc_request+0x40/0xa4
>> blk_get_request+0x2c/0x70
>> __scsi_execute+0x60/0x1c4
>> ufshcd_set_dev_pwr_mode+0x124/0x1e4
>> ufshcd_suspend+0x208/0x83c
>> ufshcd_runtime_suspend+0x40/0x154
>> ufshcd_pltfrm_runtime_suspend+0x14/0x20
>> pm_generic_runtime_suspend+0x28/0x3c
>> __rpm_callback+0x80/0x2a4
>> rpm_suspend+0x308/0x614
>> rpm_idle+0x158/0x228
>> pm_runtime_work+0x84/0xac
>> process_one_work+0x1f0/0x470
>> worker_thread+0x26c/0x4c8
>> kthread+0x13c/0x320
>> ret_from_fork+0x10/0x18
>>
>> Fix this by registering ufs device wlun as a scsi driver and
>> registering it for block runtime-pm. Also make this as a
>> supplier for all other luns. That way, this device wlun
>> suspends after all the consumers and resumes after
>> hba resumes.
>>
>> Co-developed-by: Can Guo <cang@codeaurora.org>
>> Signed-off-by: Can Guo <cang@codeaurora.org>
>> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
>> ---
>> drivers/scsi/ufs/cdns-pltfrm.c     |   2 +
>> drivers/scsi/ufs/tc-dwc-g210-pci.c |   2 +
>> drivers/scsi/ufs/ufs-debugfs.c     |   6 +-
>> drivers/scsi/ufs/ufs-debugfs.h     |   2 +-
>> drivers/scsi/ufs/ufs-exynos.c      |   2 +
>> drivers/scsi/ufs/ufs-hisi.c        |   2 +
>> drivers/scsi/ufs/ufs-mediatek.c    |  12 +-
>> drivers/scsi/ufs/ufs-qcom.c        |   2 +
>> drivers/scsi/ufs/ufs_bsg.c         |   6 +-
>> drivers/scsi/ufs/ufshcd-pci.c      |  36 +--
>> drivers/scsi/ufs/ufshcd.c          | 642 ++++++++++++++++++++++++++-----------
>> drivers/scsi/ufs/ufshcd.h          |   6 +
>> include/trace/events/ufs.h         |  20 ++
>> 13 files changed, 509 insertions(+), 231 deletions(-)
> 
> In this patch, you changed pm_runtime_{get, put}_sync to scsi_autopm_{get, put}_device.
> But, scsi_autopm_get_device() calls pm_runtime_put_sync() in case of error
> of pm_runtime_get_sync(). So, pm_runtime_put_sync() can be called twice if
> scsi_autopm_get_device has error.

Also it might be tidy to make wrappers e.g.

static inline int ufshcd_rpm_get_sync(struct ufs_hba *hba)
{
    return pm_runtime_get_sync(&hba->sdev_ufs_device->sdev_gendev);
}
   
static inline int ufshcd_rpm_put(struct ufs_hba *hba)
{
    return pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
}

static inline int ufshcd_rpm_put_sync(struct ufs_hba *hba)
{
    return pm_runtime_put_sync(&hba->sdev_ufs_device->sdev_gendev);
} 

And also consider matching: e.g.

	pm_runtime_put(hba->dev)	to	ufshcd_rpm_put(hba)
	pm_runtime_put_sync(hba->dev)	to	ufshcd_rpm_put_sync(hba)

Re: [PATCH v17 1/2] scsi: ufs: Enable power management for wlun

[Asutosh Das (asd)]

On 4/9/2021 3:07 AM, Adrian Hunter wrote:
> On 9/04/21 5:27 am, Daejun Park wrote:
>> Hi Asutosh Das,
>>
>>> During runtime-suspend of ufs host, the scsi devices are
>>> already suspended and so are the queues associated with them.
>>> But the ufs host sends SSU (START_STOP_UNIT) to wlun
>>> during its runtime-suspend.
>>> During the process blk_queue_enter checks if the queue is not in
>>> suspended state. If so, it waits for the queue to resume, and never
>>> comes out of it.
>>> The commit
>>> (d55d15a33: scsi: block: Do not accept any requests while suspended)
>>> adds the check if the queue is in suspended state in blk_queue_enter().
>>>
>>> Call trace:
>>> __switch_to+0x174/0x2c4
>>> __schedule+0x478/0x764
>>> schedule+0x9c/0xe0
>>> blk_queue_enter+0x158/0x228
>>> blk_mq_alloc_request+0x40/0xa4
>>> blk_get_request+0x2c/0x70
>>> __scsi_execute+0x60/0x1c4
>>> ufshcd_set_dev_pwr_mode+0x124/0x1e4
>>> ufshcd_suspend+0x208/0x83c
>>> ufshcd_runtime_suspend+0x40/0x154
>>> ufshcd_pltfrm_runtime_suspend+0x14/0x20
>>> pm_generic_runtime_suspend+0x28/0x3c
>>> __rpm_callback+0x80/0x2a4
>>> rpm_suspend+0x308/0x614
>>> rpm_idle+0x158/0x228
>>> pm_runtime_work+0x84/0xac
>>> process_one_work+0x1f0/0x470
>>> worker_thread+0x26c/0x4c8
>>> kthread+0x13c/0x320
>>> ret_from_fork+0x10/0x18
>>>
>>> Fix this by registering ufs device wlun as a scsi driver and
>>> registering it for block runtime-pm. Also make this as a
>>> supplier for all other luns. That way, this device wlun
>>> suspends after all the consumers and resumes after
>>> hba resumes.
>>>
>>> Co-developed-by: Can Guo <cang@codeaurora.org>
>>> Signed-off-by: Can Guo <cang@codeaurora.org>
>>> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
>>> ---
>>> drivers/scsi/ufs/cdns-pltfrm.c     |   2 +
>>> drivers/scsi/ufs/tc-dwc-g210-pci.c |   2 +
>>> drivers/scsi/ufs/ufs-debugfs.c     |   6 +-
>>> drivers/scsi/ufs/ufs-debugfs.h     |   2 +-
>>> drivers/scsi/ufs/ufs-exynos.c      |   2 +
>>> drivers/scsi/ufs/ufs-hisi.c        |   2 +
>>> drivers/scsi/ufs/ufs-mediatek.c    |  12 +-
>>> drivers/scsi/ufs/ufs-qcom.c        |   2 +
>>> drivers/scsi/ufs/ufs_bsg.c         |   6 +-
>>> drivers/scsi/ufs/ufshcd-pci.c      |  36 +--
>>> drivers/scsi/ufs/ufshcd.c          | 642 ++++++++++++++++++++++++++-----------
>>> drivers/scsi/ufs/ufshcd.h          |   6 +
>>> include/trace/events/ufs.h         |  20 ++
>>> 13 files changed, 509 insertions(+), 231 deletions(-)
>>
>> In this patch, you changed pm_runtime_{get, put}_sync to scsi_autopm_{get, put}_device.
>> But, scsi_autopm_get_device() calls pm_runtime_put_sync() in case of error
>> of pm_runtime_get_sync(). So, pm_runtime_put_sync() can be called twice if
>> scsi_autopm_get_device has error.
> 
> Also it might be tidy to make wrappers e.g.
> 
> static inline int ufshcd_rpm_get_sync(struct ufs_hba *hba)
> {
>      return pm_runtime_get_sync(&hba->sdev_ufs_device->sdev_gendev);
> }
>     
> static inline int ufshcd_rpm_put(struct ufs_hba *hba)
> {
>      return pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
> }
> 
> static inline int ufshcd_rpm_put_sync(struct ufs_hba *hba)
> {
>      return pm_runtime_put_sync(&hba->sdev_ufs_device->sdev_gendev);
> }
> 
> And also consider matching: e.g.
> 
> 	pm_runtime_put(hba->dev)	to	ufshcd_rpm_put(hba)
> 	pm_runtime_put_sync(hba->dev)	to	ufshcd_rpm_put_sync(hba)
> 
> 
> 

Ok, I'll push the changes shortly.

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
Linux Foundation Collaborative Project

Re: [PATCH v17 1/2] scsi: ufs: Enable power management for wlun

[Adrian Hunter]

On 9/04/21 8:15 pm, Asutosh Das (asd) wrote:
> On 4/9/2021 3:07 AM, Adrian Hunter wrote:
>> On 9/04/21 5:27 am, Daejun Park wrote:
>>> Hi Asutosh Das,
>>>
>>>> During runtime-suspend of ufs host, the scsi devices are
>>>> already suspended and so are the queues associated with them.
>>>> But the ufs host sends SSU (START_STOP_UNIT) to wlun
>>>> during its runtime-suspend.
>>>> During the process blk_queue_enter checks if the queue is not in
>>>> suspended state. If so, it waits for the queue to resume, and never
>>>> comes out of it.
>>>> The commit
>>>> (d55d15a33: scsi: block: Do not accept any requests while suspended)
>>>> adds the check if the queue is in suspended state in blk_queue_enter().
>>>>
>>>> Call trace:
>>>> __switch_to+0x174/0x2c4
>>>> __schedule+0x478/0x764
>>>> schedule+0x9c/0xe0
>>>> blk_queue_enter+0x158/0x228
>>>> blk_mq_alloc_request+0x40/0xa4
>>>> blk_get_request+0x2c/0x70
>>>> __scsi_execute+0x60/0x1c4
>>>> ufshcd_set_dev_pwr_mode+0x124/0x1e4
>>>> ufshcd_suspend+0x208/0x83c
>>>> ufshcd_runtime_suspend+0x40/0x154
>>>> ufshcd_pltfrm_runtime_suspend+0x14/0x20
>>>> pm_generic_runtime_suspend+0x28/0x3c
>>>> __rpm_callback+0x80/0x2a4
>>>> rpm_suspend+0x308/0x614
>>>> rpm_idle+0x158/0x228
>>>> pm_runtime_work+0x84/0xac
>>>> process_one_work+0x1f0/0x470
>>>> worker_thread+0x26c/0x4c8
>>>> kthread+0x13c/0x320
>>>> ret_from_fork+0x10/0x18
>>>>
>>>> Fix this by registering ufs device wlun as a scsi driver and
>>>> registering it for block runtime-pm. Also make this as a
>>>> supplier for all other luns. That way, this device wlun
>>>> suspends after all the consumers and resumes after
>>>> hba resumes.
>>>>
>>>> Co-developed-by: Can Guo <cang@codeaurora.org>
>>>> Signed-off-by: Can Guo <cang@codeaurora.org>
>>>> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
>>>> ---
>>>> drivers/scsi/ufs/cdns-pltfrm.c     |   2 +
>>>> drivers/scsi/ufs/tc-dwc-g210-pci.c |   2 +
>>>> drivers/scsi/ufs/ufs-debugfs.c     |   6 +-
>>>> drivers/scsi/ufs/ufs-debugfs.h     |   2 +-
>>>> drivers/scsi/ufs/ufs-exynos.c      |   2 +
>>>> drivers/scsi/ufs/ufs-hisi.c        |   2 +
>>>> drivers/scsi/ufs/ufs-mediatek.c    |  12 +-
>>>> drivers/scsi/ufs/ufs-qcom.c        |   2 +
>>>> drivers/scsi/ufs/ufs_bsg.c         |   6 +-
>>>> drivers/scsi/ufs/ufshcd-pci.c      |  36 +--
>>>> drivers/scsi/ufs/ufshcd.c          | 642 ++++++++++++++++++++++++++-----------
>>>> drivers/scsi/ufs/ufshcd.h          |   6 +
>>>> include/trace/events/ufs.h         |  20 ++
>>>> 13 files changed, 509 insertions(+), 231 deletions(-)
>>>
>>> In this patch, you changed pm_runtime_{get, put}_sync to scsi_autopm_{get, put}_device.
>>> But, scsi_autopm_get_device() calls pm_runtime_put_sync() in case of error
>>> of pm_runtime_get_sync(). So, pm_runtime_put_sync() can be called twice if
>>> scsi_autopm_get_device has error.
>>
>> Also it might be tidy to make wrappers e.g.
>>
>> static inline int ufshcd_rpm_get_sync(struct ufs_hba *hba)
>> {
>>      return pm_runtime_get_sync(&hba->sdev_ufs_device->sdev_gendev);
>> }
>>     static inline int ufshcd_rpm_put(struct ufs_hba *hba)
>> {
>>      return pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
>> }
>>
>> static inline int ufshcd_rpm_put_sync(struct ufs_hba *hba)
>> {
>>      return pm_runtime_put_sync(&hba->sdev_ufs_device->sdev_gendev);
>> }
>>
>> And also consider matching: e.g.
>>
>>     pm_runtime_put(hba->dev)    to    ufshcd_rpm_put(hba)
>>     pm_runtime_put_sync(hba->dev)    to    ufshcd_rpm_put_sync(hba)
>>
>>
>>
> 
> Ok, I'll push the changes shortly.
> 

I think I will have some more comments, so you could wait if you want.