Re: [PATCH v11 1/2] scsi: ufs: Enable power management for wlun

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On 3/15/2021 7:29 AM, Adrian Hunter wrote:
On 12/03/21 12:19 am, 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 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.

I haven't had time to try to reproduce the device-links issue, but
there are a couple of comments below, in addition to the suggestions
here:

https://lore.kernel.org/linux-scsi/b13086f3-eea1-51a7-2117-579d520f21fc@xxxxxxxxx/

Also, there are still ufshcd_err_handling_prepare()/unprepare()
and ufshcd_recover_pm_error(), that look like they need attention
e.g. to use scsi_autopm_get/put_device(hba->sdev_ufs_device)


Hi Adrian,
Thanks for the suggestions and review.

Sorry I'd missed this mail.

Let me go through it and I'll get back.


Co-developed-by: Can Guo <cang@xxxxxxxxxxxxxx>
Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
Signed-off-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
---
  drivers/scsi/ufs/cdns-pltfrm.c     |   2 +
  drivers/scsi/ufs/tc-dwc-g210-pci.c |   2 +
  drivers/scsi/ufs/ufs-debugfs.c     |   5 +
  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    |   2 +
  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          | 616 ++++++++++++++++++++++++++-----------
  drivers/scsi/ufs/ufshcd.h          |   7 +
  include/trace/events/ufs.h         |  20 ++
  13 files changed, 498 insertions(+), 206 deletions(-)

diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
index 149391f..3e70c23 100644
--- a/drivers/scsi/ufs/cdns-pltfrm.c
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -319,6 +319,8 @@ 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 dee98dc..f8ce2eb 100644
--- a/drivers/scsi/ufs/ufs-debugfs.c
+++ b/drivers/scsi/ufs/ufs-debugfs.c
@@ -54,3 +54,8 @@ void ufs_debugfs_hba_exit(struct ufs_hba *hba)
  {
  	debugfs_remove_recursive(hba->debugfs_root);
  }
+
+void ufs_debugfs_eh_exit(void)
+{
+	debugfs_remove_recursive(ufs_debugfs_root);
+}

This is the same as ufs_debugfs_exit() without __exit so why not
remove __exit from ufs_debugfs_exit() and use that instead?

diff --git a/drivers/scsi/ufs/ufs-debugfs.h b/drivers/scsi/ufs/ufs-debugfs.h
index f35b39c..3fce5a0 100644
--- a/drivers/scsi/ufs/ufs-debugfs.h
+++ b/drivers/scsi/ufs/ufs-debugfs.h
@@ -12,11 +12,13 @@ void __init ufs_debugfs_init(void);
  void __exit 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_eh_exit(void);
  #else
  static inline void ufs_debugfs_init(void) {}
  static inline void ufs_debugfs_exit(void) {}
  static inline void ufs_debugfs_hba_init(struct ufs_hba *hba) {}
  static inline void ufs_debugfs_hba_exit(struct ufs_hba *hba) {}
+static inline void ufs_debugfs_eh_exit(void) {}
  #endif
#endif
diff --git a/drivers/scsi/ufs/ufs-exynos.c b/drivers/scsi/ufs/ufs-exynos.c
index 267943a1..45c0b02 100644
--- a/drivers/scsi/ufs/ufs-exynos.c
+++ b/drivers/scsi/ufs/ufs-exynos.c
@@ -1268,6 +1268,8 @@ 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 c55202b..df1eabb 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -1097,6 +1097,8 @@ 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 f97d7b0..9aa098a 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1546,6 +1546,8 @@ 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 fadd566..5d4ffd2 100644
--- a/drivers/scsi/ufs/ufshcd-pci.c
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -247,29 +247,6 @@ 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
@@ -365,17 +342,14 @@ 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 45624c7..254f952 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"
@@ -78,6 +79,8 @@
  /* 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;                                               \
@@ -1556,7 +1559,7 @@ 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;
@@ -1572,7 +1575,7 @@ 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;
@@ -2572,6 +2575,17 @@ 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;
@@ -4106,11 +4120,11 @@ 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);
+		scsi_autopm_get_device(hba->sdev_ufs_device);

ufs-mediatek.c calls ufshcd_auto_hibern8_update() at link startup when
hba->sdev_ufs_device can be NULL.


  		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);
@@ -4808,6 +4822,38 @@ 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)
+			return;
+	} else {
+		/* device wlun is probed */
+		hba->luns_avail--;
+	}
+}
+
+/**
   * ufshcd_slave_alloc - handle initial SCSI device configurations
   * @sdev: pointer to SCSI device
   *
@@ -4838,6 +4884,8 @@ 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;
  }
@@ -4875,6 +4923,17 @@ static int ufshcd_slave_configure(struct scsi_device *sdev) ufshcd_crypto_setup_rq_keyslot_manager(hba, q); + /*
+	 * sd_probe() runs asynchronously with scsi_sysfs_add_sdev().
+	 * Say, scsi_sysfs_add_sdev() suspends just before sd_probe()
+	 * it'd reset the link's rpm_active to 1.
+	 * That may cause the supplier to suspend before the consumer,
+	 * which is bad.
+	 * So block runtime-pm until all devices are probed.
+	 * Refer ufshcd_scsi_sync_probe().
+	 */
+	pm_runtime_forbid(&sdev->sdev_gendev);
+
  	return 0;
  }
@@ -4985,15 +5044,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
  			 * UFS device needs urgent BKOPs.
  			 */
  			if (!hba->pm_op_in_progress &&
-			    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 */
@@ -5589,8 +5642,8 @@ 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);
  }
/**
@@ -5607,7 +5660,6 @@ 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) {
@@ -5623,14 +5675,6 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
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;
  }
@@ -7207,11 +7251,12 @@ static void ufshcd_set_active_icc_lvl(struct ufs_hba *hba) static inline void ufshcd_blk_pm_runtime_init(struct scsi_device *sdev)
  {
+	int dly = is_device_wlun(sdev) ? 0:RPM_AUTOSUSPEND_DELAY_MS;
+
  	scsi_autopm_get_device(sdev);
  	blk_pm_runtime_init(sdev->request_queue, &sdev->sdev_gendev);
  	if (sdev->rpm_autosuspend)
-		pm_runtime_set_autosuspend_delay(&sdev->sdev_gendev,
-						 RPM_AUTOSUSPEND_DELAY_MS);
+		pm_runtime_set_autosuspend_delay(&sdev->sdev_gendev, dly);
  	scsi_autopm_put_device(sdev);
  }
@@ -7417,6 +7462,9 @@ 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);
@@ -7892,6 +7940,7 @@ 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) {
@@ -8475,7 +8524,8 @@ 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; @@ -8650,23 +8700,7 @@ 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;
@@ -8674,7 +8708,7 @@ 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;
@@ -8697,17 +8731,17 @@ 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)) {
@@ -8719,7 +8753,7 @@ 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);
@@ -8747,7 +8781,7 @@ 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;
  		}
  	}
@@ -8760,7 +8794,6 @@ 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
@@ -8769,28 +8802,9 @@ 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
@@ -8812,57 +8826,32 @@ 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;
+	enum uic_link_state old_link_state = hba->uic_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;
-
-	/* 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
@@ -8871,7 +8860,7 @@ 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 +8905,147 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
  		 */
  		ufshcd_urgent_bkops(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);
+	/* 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 +9053,43 @@ 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 +9104,7 @@ 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
   */
@@ -8987,21 +9130,7 @@ 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)),
@@ -9023,7 +9152,6 @@ EXPORT_SYMBOL(ufshcd_system_suspend);
int ufshcd_system_resume(struct ufs_hba *hba)
  {
-	int ret = 0;
  	ktime_t start = ktime_get();
if (!hba)
@@ -9034,22 +9162,18 @@ int ufshcd_system_resume(struct ufs_hba *hba)
  		down(&hba->host_sem);
  	}
- 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);
@@ -9058,12 +9182,12 @@ 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)
@@ -9072,12 +9196,12 @@ int ufshcd_runtime_suspend(struct ufs_hba *hba)
  	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);
@@ -9085,26 +9209,14 @@ 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)
@@ -9113,12 +9225,12 @@ int ufshcd_runtime_resume(struct ufs_hba *hba)
  	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);
@@ -9132,14 +9244,13 @@ 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);
@@ -9152,10 +9263,8 @@ 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;
@@ -9260,6 +9369,20 @@ static const struct blk_mq_ops ufshcd_tmf_ops = {
  	.queue_rq = ufshcd_queue_tmf,
  };
+static void ufshcd_scsi_sync_probe(struct work_struct *work)
+{
+	struct ufs_hba *hba;
+	struct scsi_device *sdev;
+
+	hba = container_of(work, struct ufs_hba, sync_probe_work);
+	wait_for_device_probe();
+
+	shost_for_each_device(sdev, hba->host) {
+		if (pm_runtime_enabled(&sdev->sdev_gendev))
+			pm_runtime_allow(&sdev->sdev_gendev);
+	}
+}
+
  /**
   * ufshcd_init - Driver initialization routine
   * @hba: per-adapter instance
@@ -9456,6 +9579,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
  	 */
  	ufshcd_set_ufs_dev_active(hba);
+ INIT_WORK(&hba->sync_probe_work, ufshcd_scsi_sync_probe);
+	schedule_work(&hba->sync_probe_work);

I think we still need to confirm whether or not this is needed, and whether
it is something the UFS driver should be responsible for.

  	async_schedule(ufshcd_async_scan, hba);
  	ufs_sysfs_add_nodes(hba->dev);
@@ -9477,15 +9602,162 @@ 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)
+{
+	ufshcd_wl_shutdown(dev);
+	return 0;
+}
+#endif
+
+static int ufshcd_wl_probe(struct device *dev)
+{
+	return is_device_wlun(to_scsi_device(dev)) ? 0 : -ENODEV;
+}
+
+static int ufshcd_wl_remove(struct device *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_eh_exit();
+		return ret;
+	}
+	ret = scsi_register_driver(&ufs_rpmb_wlun_template.gendrv);
+	if (ret) {
+		ufs_debugfs_eh_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_dev_wlun_template.gendrv);
+	scsi_unregister_driver(&ufs_rpmb_wlun_template.gendrv);
  }
module_init(ufshcd_core_init);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index ee61f82..c5f7335 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,
@@ -804,6 +806,7 @@ 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;
@@ -841,6 +844,8 @@ struct ufs_hba {
  #ifdef CONFIG_DEBUG_FS
  	struct dentry *debugfs_root;
  #endif
+	struct work_struct sync_probe_work;
+	u32 luns_avail;
  };
/* Returns true if clocks can be gated. Otherwise false */
@@ -1100,6 +1105,8 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
  			     enum query_opcode desc_op);
int ufshcd_wb_ctrl(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 e151477..d9d233b 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,




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



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