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Message-ID: <20210224001638.GB12147@stor-presley.qualcomm.com>
Date: Tue, 23 Feb 2021 16:16:38 -0800
From: Asutosh Das <asutoshd@...eaurora.org>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: cang@...eaurora.org, martin.petersen@...cle.com,
linux-scsi@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>,
Stanley Chu <stanley.chu@...iatek.com>,
Bean Huo <beanhuo@...ron.com>,
Jaegeuk Kim <jaegeuk@...nel.org>,
Kiwoong Kim <kwmad.kim@...sung.com>,
Satya Tangirala <satyat@...gle.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] scsi: ufs: Enable power management for wlun
On Tue, Feb 23 2021 at 12:23 -0800, Adrian Hunter wrote:
>On 23/02/21 1:04 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.
>
>Hi
>
Hi Adrian
>I have a few more questions and comments.
>
Thanks for the review.
I'll go through your comments and fix it in the next version.
>At a glance it looked to me like the SCSI bus will leave a SCSI device
>runtime suspended at system suspend, but UFS device spm_lvl and rpm_lvl need
>not be the same. Do you know how SCSI handles that case?
>
Good point.
Yes, it says that:
/*
* All the high-level SCSI drivers that implement runtime
* PM treat runtime suspend, system suspend, and system
* hibernate nearly identically. In all cases the requirements
* for runtime suspension are stricter.
*/
It's not true in case of ufs.
I can think of a couple of approaches:
Adding a couple of more cb() to ufs device wlun:
1. .prepare() -> runtime resume the ufs device -> pm_runtime_get_noresume()
2. .resume_early() -> pm_runtime_put_noidle()
Or,
Add a check to SCSI pm such that, should a device expose a capability saying
that it's runtime-pm differs from its system-pm, scsi-pm invokes the said device's
system-pm cb(). I'm not sure if this approach would violate any underlying assumptions.
Also, I'm not sure which would be a better approach or if there's another approach entirely.
Appreciate any insights.
>>
>> Co-developed-by: Can Guo <cang@...eaurora.org>
>> Signed-off-by: Can Guo <cang@...eaurora.org>
>> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
>> ---
>> drivers/scsi/ufs/ufshcd.c | 455 +++++++++++++++++++++++++++++++++++----------
>> drivers/scsi/ufs/ufshcd.h | 4 +
>> include/trace/events/ufs.h | 20 ++
>> 3 files changed, 382 insertions(+), 97 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 45624c7..1d8044a 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"
>> @@ -251,6 +252,11 @@ static int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
>> static inline int ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
>> static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba);
>> static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba);
>> +static int ufshcd_wl_runtime_suspend(struct device *dev);
>> +static int ufshcd_wl_runtime_resume(struct device *dev);
>> +static int ufshcd_wl_suspend(struct device *dev);
>> +static int ufshcd_wl_resume(struct device *dev);
>> +static void ufshcd_wl_shutdown(struct device *dev);
>>
>> static inline bool ufshcd_valid_tag(struct ufs_hba *hba, int tag)
>> {
>> @@ -1556,7 +1562,7 @@ 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 +1578,7 @@ 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 +2578,17 @@ 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;
>> @@ -4808,6 +4825,41 @@ 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);
>> + 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;
>> +
>> + pm_runtime_put_noidle(&hba->sdev_ufs_device->sdev_gendev);
>> + pm_runtime_mark_last_busy(&hba->sdev_ufs_device->sdev_gendev);
>> + } else {
>> + /* device wlun is probed */
>> + hba->luns_avail--;
>> + }
>> +}
>> +
>> +/**
>> * ufshcd_slave_alloc - handle initial SCSI device configurations
>> * @sdev: pointer to SCSI device
>> *
>> @@ -4838,6 +4890,8 @@ 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;
>> }
>>
>> @@ -4984,16 +5038,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
>> * solution could be to abort the system suspend if
>> * 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);
>> - }
>> + if (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 +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);
>> }
>>
>> /**
>> @@ -5607,7 +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) {
>> @@ -5623,14 +5669,6 @@ 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;
>> }
>>
>> @@ -7254,6 +7292,15 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
>> goto out;
>> }
>> ufshcd_blk_pm_runtime_init(hba->sdev_ufs_device);
>> + /*
>> + * A pm_runtime_put_sync is invoked when this device enables blk_pm_runtime
>> + * & would suspend the device-wlun upon timer expiry.
>> + * But suspending device wlun _may_ put the ufs device in the pre-defined
>> + * low power mode (SSU <rpm_lvl>). Probing of other luns may fail then.
>> + * Don't allow this suspend until all the luns have been probed.
>> + * See pm_runtime_mark_last_busy in ufshcd_setup_links.
>> + */
>> + pm_runtime_get_noresume(&hba->sdev_ufs_device->sdev_gendev);
>> scsi_device_put(hba->sdev_ufs_device);
>>
>> hba->sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
>> @@ -7417,6 +7464,9 @@ 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);
>> @@ -7747,6 +7797,54 @@ static int ufshcd_device_params_init(struct ufs_hba *hba)
>> return ret;
>> }
>>
>> +static int ufshcd_wl_probe(struct device *dev)
>> +{
>> + struct scsi_device *sdev = to_scsi_device(dev);
>> +
>> + /*
>> + * Use this driver for both device wlun and rpmb lun
>> + * It's used to send uac to rpmb wlun and ssu to device wlun
>> + */
>> + if (sdev && (is_rpmb_wlun(sdev) || is_device_wlun(sdev)))
>> + return 0;
>> + return -ENODEV;
>> +}
>> +
>> +static int ufshcd_wl_remove(struct device *dev)
>> +{
>> + struct scsi_device *sdev = to_scsi_device(dev);
>> +
>> + scsi_remove_device(sdev);
>
>The 'probe' did not do the __scsi_add_device(), so does the 'remove' need to
>do scsi_remove_device()?
>
>> + return 0;
>> +}
>> +
>> +static const struct dev_pm_ops ufshcd_wl_pm_ops = {
>> + SET_RUNTIME_PM_OPS(ufshcd_wl_runtime_suspend, ufshcd_wl_runtime_resume, NULL)
>> + SET_SYSTEM_SLEEP_PM_OPS(ufshcd_wl_suspend, ufshcd_wl_resume)
>
>.poweroff needs to set the power mode to PowerDown irrespective of spm_lvl,
>so not exactly the same as ufshcd_wl_suspend.
>
>Also, ufshcd_pci_poweroff() in ufshcd-pci.c should be removed since it won't
>work anymore.
>
>> +};
>> +
>> +/**
>> + * ufs_wlun - describes 2 wluns:
>> + * ufs-device wlun - used to send pm commands
>> + * and rpmb wlun - for rpmb commands
>> + * All luns including rpmb 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_wlun = {
>> + .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,
>> + },
>> +};
>
>WRT to RPMB, aren't all the callbacks optional, so that would leave only
>something like below. Would that work?
>
>#define wlun_dev_to_hba(dv) shost_priv(to_scsi_device(dv)->host)
>
>static int ufs_rpmb_probe(struct device *dev)
>{
> return is_rpmb_wlun(to_scsi_device(dev)) ? 0 : -ENODEV;
>}
>
>static int ufs_rpmb_runtime_resume(struct device *dev)
>{
> struct ufs_hba *hba = wlun_dev_to_hba(dev);
>
> if (hba->sdev_rpmb)
> return ufshcd_clear_ua_wlun(hba, UFS_UPIU_RPMB_WLUN);
> return 0;
>}
>
>static int ufs_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_ua_wlun(hba, UFS_UPIU_RPMB_WLUN);
> return 0;
>}
>
>static const struct dev_pm_ops ufs_rpmb_pm_ops = {
> SET_RUNTIME_PM_OPS(NULL, ufs_rpmb_runtime_resume, NULL)
> SET_SYSTEM_SLEEP_PM_OPS(NULL, ufs_rpmb_resume)
>};
>
>static struct scsi_driver ufs_rpmb_template = {
> .gendrv = {
> .name = "ufs_rpmb_wlun",
> .owner = THIS_MODULE,
> .probe = ufs_rpmb_probe,
> .pm = &ufs_rpmb_pm_ops,
> },
>};
>
>
>> +
>> /**
>> * ufshcd_add_lus - probe and add UFS logical units
>> * @hba: per-adapter instance
>> @@ -7755,6 +7853,12 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
>> {
>> int ret;
>>
>> + ret = scsi_register_driver(&ufs_wlun.gendrv);
>
>That will attempt to register the driver every time a UFS host controller is
>added (e.g. what happens if you unbind and re-bind the host controller).
>Probably needs to be in ufshcd_core_init() with corresponding unregister in
>ufshcd_core_exit()
>
>> + if (ret) {
>> + dev_err(hba->dev, "Register device wlun driver failed: %d\n",
>> + ret);
>> + return ret;
>> + }
>> /* Add required well known logical units to scsi mid layer */
>> ret = ufshcd_scsi_add_wlus(hba);
>> if (ret)
>> @@ -7964,6 +8068,7 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie)
>> pm_runtime_put_sync(hba->dev);
>> ufshcd_hba_exit(hba);
>> }
>> + hba->init_done = true;
>> }
>>
>> static const struct attribute_group *ufshcd_driver_groups[] = {
>> @@ -8475,7 +8580,8 @@ 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;
>>
>> @@ -8650,31 +8756,19 @@ 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;
>> enum ufs_pm_level pm_lvl;
>> enum ufs_dev_pwr_mode req_dev_pwr_mode;
>> enum uic_link_state req_link_state;
>>
>> - hba->pm_op_in_progress = 1;
>> + /*
>> + * Is invoked when the device wlun is added to sysfs
>> + * But by then hba->sdev_ufs_device may not be initialized.
>> + */
>> + if (!hba->init_done)
>> + return 0;
>> if (!ufshcd_is_shutdown_pm(pm_op)) {
>> pm_lvl = ufshcd_is_runtime_pm(pm_op) ?
>> hba->rpm_lvl : hba->spm_lvl;
>> @@ -8690,24 +8784,23 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>> * just gate the clocks.
>> */
>> ufshcd_hold(hba, false);
>> - hba->clk_gating.is_suspended = true;
>>
>> if (ufshcd_is_clkscaling_supported(hba))
>> ufshcd_clk_scaling_suspend(hba, true);
>>
>> 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 +8812,7 @@ 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);
>> @@ -8746,10 +8839,224 @@ 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;
>> + if (!ret)
>> + goto out;
>> }
>> }
>> +enable_scaling:
>> + if (ufshcd_is_clkscaling_supported(hba))
>> + ufshcd_clk_scaling_suspend(hba, false);
>> +
>> + hba->dev_info.b_rpm_dev_flush_capable = false;
>> +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));
>> + }
>> + if (ret)
>> + ufshcd_update_evt_hist(hba, UFS_EVT_WL_SUSP_ERR, (u32)ret);
>> + ufshcd_release(hba);
>> + return ret;
>> +}
>> +
>> +static int __ufshcd_wl_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>> +{
>> + int ret = 0;
>> +
>> + if (!hba->init_done)
>> + return 0;
>> +
>> + ufshcd_hold(hba, false);
>> + if (ufshcd_is_ufs_dev_deepsleep(hba)) {
>> + /* The device is in DeepSleep but hba was not suspended */
>> + ret = ufshcd_reset_and_restore(hba);
>> + if (ret)
>> + goto out;
>> + }
>> +
>> + if (!ufshcd_is_ufs_dev_active(hba)) {
>> + ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
>> + if (ret)
>> + goto out;
>> + }
>> +
>> + if (ufshcd_keep_autobkops_enabled_except_suspend(hba))
>> + ufshcd_enable_auto_bkops(hba);
>> + else
>> + /*
>> + * If BKOPs operations are urgently needed at this moment then
>> + * keep auto-bkops enabled or else disable it.
>> + */
>> + ufshcd_urgent_bkops(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);
>> + }
>> +
>> +out:
>> + if (ret)
>> + ufshcd_update_evt_hist(hba, UFS_EVT_WL_RES_ERR, (u32)ret);
>> + ufshcd_release(hba);
>> + 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);
>> +
>> + if (is_rpmb_wlun(sdev))
>> + return 0;
>> + 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;
>> + ktime_t start = ktime_get();
>> +
>> + hba = shost_priv(sdev->host);
>> +
>> + if (is_rpmb_wlun(sdev)) {
>> + if (hba->sdev_rpmb)
>> + return ufshcd_clear_ua_wlun(hba, UFS_UPIU_RPMB_WLUN);
>> + return 0;
>> + }
>> +
>> + 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;
>> +}
>> +
>> +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();
>> +
>> + if (is_rpmb_wlun(sdev))
>> + return 0;
>> + 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;
>> + ktime_t start = ktime_get();
>> +
>> + if (pm_runtime_suspended(dev))
>> + return 0;
>> + hba = shost_priv(sdev->host);
>> +
>> + if (is_rpmb_wlun(sdev)) {
>> + if (hba->sdev_rpmb)
>> + return ufshcd_clear_ua_wlun(hba, UFS_UPIU_RPMB_WLUN);
>> + return 0;
>> + }
>> +
>> + 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;
>> +}
>> +
>> +static void ufshcd_wl_shutdown(struct device *dev)
>> +{
>> + struct scsi_device *sdev = to_scsi_device(dev);
>> + struct ufs_hba *hba;
>> +
>> + if (is_rpmb_wlun(sdev))
>> + return;
>> + hba = shost_priv(sdev->host);
>> + scsi_device_quiesce(sdev);
>> + shost_for_each_device(sdev, hba->host) {
>> + if (sdev == hba->sdev_ufs_device)
>> + continue;
>> + scsi_remove_device(sdev);
>
>Shutdown needs to quiesce devices. Removing devices is not advisable
>because the upper layers cannot respond at this point, causing deadlocks.
>Is scsi_remove_device() really needed here?
>
>> + }
>> + __ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
>> +}
>> +
>> +/**
>> + * 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 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
>> + * link is powered off.
>> + *
>> + * Returns 0 for success and non-zero for failure
>> + */
>> +static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>> +{
>> + int ret = 0;
>> + int check_for_bkops;
>> + enum ufs_pm_level pm_lvl;
>> + enum ufs_dev_pwr_mode req_dev_pwr_mode;
>> + enum uic_link_state req_link_state;
>> +
>> + hba->pm_op_in_progress = 1;
>> + if (!ufshcd_is_shutdown_pm(pm_op)) {
>> + pm_lvl = ufshcd_is_runtime_pm(pm_op) ?
>> + hba->rpm_lvl : hba->spm_lvl;
>> + req_dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(pm_lvl);
>> + req_link_state = ufs_get_pm_lvl_to_link_pwr_state(pm_lvl);
>> + } else {
>> + req_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE;
>> + req_link_state = UIC_LINK_OFF_STATE;
>> + }
>> +
>> + /*
>> + * If we can't transition into any of the low power modes
>> + * just gate the clocks.
>> + */
>> + ufshcd_hold(hba, false);
>> + hba->clk_gating.is_suspended = true;
>>
>> /*
>> * In the case of DeepSleep, the device is expected to remain powered
>> @@ -8758,9 +9065,8 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>> check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba);
>> ret = ufshcd_link_state_transition(hba, req_link_state, check_for_bkops);
>> if (ret)
>> - goto set_dev_active;
>> + goto enable_gating;
>>
>> -disable_clks:
>> /*
>> * Call vendor specific suspend callback. As these callbacks may access
>> * vendor specific host controller register space call them before the
>> @@ -8790,7 +9096,6 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>> 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
>> @@ -8804,28 +9109,15 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>> ufshcd_set_link_active(hba);
>> else if (ufshcd_is_link_off(hba))
>> ufshcd_host_reset_and_restore(hba);
>> -set_dev_active:
>> /* Can also get here needing to exit DeepSleep */
>> if (ufshcd_is_ufs_dev_deepsleep(hba)) {
>> ufshcd_device_reset(hba);
>> ufshcd_host_reset_and_restore(hba);
>> }
>> - if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
>> - ufshcd_disable_auto_bkops(hba);
>> enable_gating:
>> - 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)
>> @@ -8846,10 +9138,8 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>> static int ufshcd_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);
>> @@ -8901,43 +9191,14 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>> goto vendor_suspend;
>> }
>>
>> - if (!ufshcd_is_ufs_dev_active(hba)) {
>> - ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
>> - if (ret)
>> - goto set_old_link_state;
>> - }
>> -
>> - if (ufshcd_keep_autobkops_enabled_except_suspend(hba))
>> - ufshcd_enable_auto_bkops(hba);
>> - else
>> - /*
>> - * If BKOPs operations are urgently needed at this moment then
>> - * keep auto-bkops enabled or else disable it.
>> - */
>> - 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->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);
>>
>> 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:
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index ee61f82..7662387 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,
>> @@ -841,6 +843,8 @@ struct ufs_hba {
>> #ifdef CONFIG_DEBUG_FS
>> struct dentry *debugfs_root;
>> #endif
>> + bool init_done;
>> + u32 luns_avail;
>> };
>>
>> /* Returns true if clocks can be gated. Otherwise false */
>> 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,
>>
>
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