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

Jaegeuk Kim
2021-03-12T18:20:04Z

On 03/11, 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.
>
> 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 | 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);
> +}
> 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);
> 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;

Shouldn' it be a separate patch, since this is not your runtime-suspend issue?

> }
>
> 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);
> 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,
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.