Re: [PATCH v12 1/2] scsi: ufs: Enable power management for wlun

Asutosh Das (asd)
2021-03-22T19:54:47Z

On 3/19/2021 10:47 AM, Adrian Hunter wrote:
> On 19/03/21 2:35 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.
>>
>> Co-developed-by: Can Guo <cang@codeaurora.org>
>> Signed-off-by: Can Guo <cang@codeaurora.org>
>> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
>
> I have some more comments that may help straighten things out.
>
> Also please look at ufs_debugfs_get_user_access() and
> ufs_debugfs_put_user_access() that now need to scsi_autopm_get/put_device
> sdev_ufs_device.
>
> It would also be good if you could re-base on linux-next.
>

Hi Adrian
Thanks for the comments.

I agree moving the code to wlun probe and other changes.
But it looks to me that it may not fully solve the issue.

Please let me explain my understanding on this:

(Please refer to the logs in v10)
scsi_autopm_*() are invoked on a sdev.
pm_runtime_get_suppliers()/rpm_put_suppliers() are on the supplier device.

For the device wlun:
slave_configure():
- doesn't set the rpm_autosuspend
- pm_runtime_getnoresume()
scsi_sysfs_add_sdev():
- pm_runtime_forbid()
- scsi_autopm_get_device()
- device_add()
- ufshcd_wl_probe()
- scsi_autopm_put_device()

For all other scsi devices:
slave_alloc():
- ufshcd_setup_links()
Say all link_add: pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
slave_configure():
- set rpm_autosuspend
scsi_sysfs_add_sdev():
- scsi_autopm_get_device()
- device_add() -> schedules an async probe()
- scsi_autopm_put_device() - (1)

Now the rpm_put_suppliers() can be invoked *after*
pm_runtime_get_suppliers() of the async probe(), since both are running
in different contexts.
In that case, the usage_count of supplier would be decremented until
rpm_active of this link becomes 1.
Now the pm_runtime_get_suppliers() expects the link_active to be more
than 1.
Now then, there comes a time, that when sd_probe() schedules a suspend,
the supplier usage_count becomes 0 and the link_active becomes 1.
And the supplier suspends before the consumer.

So I was wondering, what'd make sure that the pm_runtime_get_suppliers()
from driver_probe_device() is invoked after scsi_autopm_put_device() (1)
finishes the rpm_put_suppliers().

Am not sure if I'm missing something in this.
Do you think, the current changes alone can fix the above issue?

-asd

>> ---
>> drivers/scsi/ufs/cdns-pltfrm.c | 2 +
>> drivers/scsi/ufs/tc-dwc-g210-pci.c | 2 +
>> drivers/scsi/ufs/ufs-debugfs.c | 2 +-
>> drivers/scsi/ufs/ufs-debugfs.h | 2 +-
>> drivers/scsi/ufs/ufs-exynos.c | 2 +
>> drivers/scsi/ufs/ufs-hisi.c | 2 +
>> drivers/scsi/ufs/ufs-mediatek.c | 12 +-
>> drivers/scsi/ufs/ufs-qcom.c | 2 +
>> drivers/scsi/ufs/ufs_bsg.c | 6 +-
>> drivers/scsi/ufs/ufshcd-pci.c | 36 +--
>> drivers/scsi/ufs/ufshcd.c | 622 ++++++++++++++++++++++++++-----------
>> drivers/scsi/ufs/ufshcd.h | 6 +
>> include/trace/events/ufs.h | 20 ++
>> 13 files changed, 491 insertions(+), 225 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..06457d5 100644
>> --- a/drivers/scsi/ufs/ufs-debugfs.c
>> +++ b/drivers/scsi/ufs/ufs-debugfs.c
>> @@ -13,7 +13,7 @@ void __init ufs_debugfs_init(void)
>> ufs_debugfs_root = debugfs_create_dir("ufshcd", NULL);
>> }
>>
>> -void __exit ufs_debugfs_exit(void)
>> +void ufs_debugfs_exit(void)
>> {
>> debugfs_remove_recursive(ufs_debugfs_root);
>> }
>> diff --git a/drivers/scsi/ufs/ufs-debugfs.h b/drivers/scsi/ufs/ufs-debugfs.h
>> index f35b39c..12c2730 100644
>> --- a/drivers/scsi/ufs/ufs-debugfs.h
>> +++ b/drivers/scsi/ufs/ufs-debugfs.h
>> @@ -9,7 +9,7 @@ struct ufs_hba;
>>
>> #ifdef CONFIG_DEBUG_FS
>> void __init ufs_debugfs_init(void);
>> -void __exit ufs_debugfs_exit(void);
>> +void ufs_debugfs_exit(void);
>> void ufs_debugfs_hba_init(struct ufs_hba *hba);
>> void ufs_debugfs_hba_exit(struct ufs_hba *hba);
>> #else
>> 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..51c82e3 100644
>> --- a/drivers/scsi/ufs/ufs-mediatek.c
>> +++ b/drivers/scsi/ufs/ufs-mediatek.c
>> @@ -810,12 +810,10 @@ static int ufs_mtk_post_link(struct ufs_hba *hba)
>> /* enable unipro clock gating feature */
>> ufs_mtk_cfg_unipro_cg(hba, true);
>>
>> - /* configure auto-hibern8 timer to 10ms */
>> - if (ufshcd_is_auto_hibern8_supported(hba)) {
>> - ufshcd_auto_hibern8_update(hba,
>> - FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 10) |
>> - FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3));
>> - }
>> + /* will be configured during probe hba */
>> + if (ufshcd_is_auto_hibern8_supported(hba))
>> + hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 10) |
>> + FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
>>
>> ufs_mtk_setup_clk_gating(hba);
>>
>> @@ -1097,6 +1095,8 @@ static const struct dev_pm_ops ufs_mtk_pm_ops = {
>> .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
>> .runtime_resume = ufshcd_pltfrm_runtime_resume,
>> .runtime_idle = ufshcd_pltfrm_runtime_idle,
>> + .prepare = ufshcd_suspend_prepare,
>> + .complete = ufshcd_resume_complete,
>> };
>>
>> static struct platform_driver ufs_mtk_pltform = {
>> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
>> index 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..7106cb8 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 +4822,41 @@ 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|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) {
>
> The condition here is the wrong way around. i.e. should be
>
> if (hba->luns_avail == 1) {
>
>> + pm_runtime_put_noidle(&hba->sdev_ufs_device->sdev_gendev);
>
> If the usage_count is zero here, then we should let it suspend i.e. make this:
>
> pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
>
> Note this pairs with the pm_runtime_get_noresume() that needs to be added
> to ufshcd_slave_configure. Please see comments for ufshcd_slave_configure().
>
>
>> + pm_runtime_allow(&hba->sdev_ufs_device->sdev_gendev);
>
> This pm_runtime_allow should not be here. It should be in ufshcd_wl_probe().
> Please see comments for ufshcd_wl_probe().
>
>> + return;
>> + }
>> + } else {
>> + /* device wlun is probed */
>> + hba->luns_avail--;
>> + }
>> +}
>> +
>> +/**
>> * ufshcd_slave_alloc - handle initial SCSI device configurations
>> * @sdev: pointer to SCSI device
>> *
>> @@ -4838,6 +4887,8 @@ 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;
>> }
>>
>> @@ -4869,8 +4920,13 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
>> blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
>> if (hba->quirks & UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE)
>> blk_queue_update_dma_alignment(q, PAGE_SIZE - 1);
>> -
>> - if (ufshcd_is_rpm_autosuspend_allowed(hba))
>> + /*
>> + * Block runtime-pm until all consumers are added.
>> + * Refer ufshcd_setup_links().
>> + */
>> + if (is_device_wlun(sdev))
>> + pm_runtime_forbid(&sdev->sdev_gendev);
>
> Since rpm_autosuspend is not being set for sdev_ufs_device, scsi_sysfs_add_sdev()
> will pm_runtime_forbid() it anyway. We should increase the usage_count instead
> i.e.
>
> pm_runtime_get_noresume(&sdev->sdev_gendev);
>
>> + else if (ufshcd_is_rpm_autosuspend_allowed(hba))
>> sdev->rpm_autosuspend = 1;
>>
>> ufshcd_crypto_setup_rq_keyslot_manager(hba, q);
>> @@ -4985,15 +5041,9 @@ 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 +5639,8 @@ 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 +5657,6 @@ 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 +5672,6 @@ 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;
>> }
>>
>> @@ -5755,12 +5796,13 @@ static void ufshcd_clk_scaling_suspend(struct ufs_hba *hba, bool suspend)
>>
>> static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
>> {
>> - pm_runtime_get_sync(hba->dev);
>> - if (pm_runtime_status_suspended(hba->dev) || hba->is_sys_suspended) {
>> + scsi_autopm_get_device(hba->sdev_ufs_device);
>> + if (pm_runtime_status_suspended(&hba->sdev_ufs_device->sdev_gendev) ||
>> + hba->is_sys_suspended) {
>> enum ufs_pm_op pm_op;
>>
>> /*
>> - * Don't assume anything of pm_runtime_get_sync(), if
>> + * Don't assume anything of resume, if
>> * resume fails, irq and clocks can be OFF, and powers
>> * can be OFF or in LPM.
>> */
>> @@ -5789,7 +5831,7 @@ static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
>> ufshcd_release(hba);
>> if (ufshcd_is_clkscaling_supported(hba))
>> ufshcd_clk_scaling_suspend(hba, false);
>> - pm_runtime_put(hba->dev);
>> + pm_runtime_put(&hba->sdev_ufs_device->sdev_gendev);
>> }
>>
>> static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba)
>> @@ -5810,14 +5852,14 @@ static void ufshcd_recover_pm_error(struct ufs_hba *hba)
>>
>> hba->is_sys_suspended = false;
>> /*
>> - * Set RPM status of hba device to RPM_ACTIVE,
>> + * Set RPM status of wlun device to RPM_ACTIVE,
>> * this also clears its runtime error.
>> */
>> - ret = pm_runtime_set_active(hba->dev);
>> + ret = pm_runtime_set_active(&hba->sdev_ufs_device->sdev_gendev);
>> /*
>> - * If hba device had runtime error, we also need to resume those
>> - * scsi devices under hba in case any of them has failed to be
>> - * resumed due to hba runtime resume failure. This is to unblock
>> + * If wlun device had runtime error, we also need to resume those
>> + * consumer scsi devices in case any of them has failed to be
>> + * resumed due to supplier runtime resume failure. This is to unblock
>> * blk_queue_enter in case there are bios waiting inside it.
>> */
>> if (!ret) {
>> @@ -7207,11 +7249,12 @@ 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);
>> }
>>
>> @@ -7253,6 +7296,7 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
>> hba->sdev_ufs_device = NULL;
>> goto out;
>> }
>> + scsi_autopm_get_device(hba->sdev_ufs_device);
>> ufshcd_blk_pm_runtime_init(hba->sdev_ufs_device);
>
> Let's drop both scsi_autopm_get_device() and ufshcd_blk_pm_runtime_init()
> here and instead do things in ufshcd_wl_probe() - see comments for ufshcd_wl_probe()
>
>> scsi_device_put(hba->sdev_ufs_device);
>>
>> @@ -7417,6 +7461,9 @@ 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 +7939,7 @@ 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 +8523,8 @@ 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 +8699,7 @@ 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 +8707,7 @@ 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 +8730,17 @@ 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 +8752,7 @@ 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 +8780,7 @@ 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 +8793,6 @@ 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 +8801,9 @@ 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 +8825,32 @@ 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 +8859,7 @@ 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 +8904,147 @@ 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 +9052,43 @@ 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 +9103,7 @@ 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 +9129,7 @@ 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 +9151,6 @@ 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 +9161,18 @@ 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 +9181,12 @@ 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 +9195,12 @@ 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 +9208,14 @@ 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 +9224,12 @@ 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 +9243,13 @@ 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 +9262,8 @@ 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;
>> @@ -9477,15 +9585,163 @@ 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;
>
> The "ufs_device_wlun" driver owns PM for sdev_ufs_device because it
> provides the dev_pm_ops. This is where the pm_runtime_allow() belongs
> and it is symmetrical with the pm_runtime_forbid() in ufshcd_wl_remove().
>
> if (!is_device_wlun(to_scsi_device(dev)))
> return -ENODEV;
> blk_pm_runtime_init(dev);
> pm_runtime_set_autosuspend_delay(dev, 0);
> pm_runtime_allow(dev);
>
> Note sdev_ufs_device will not runtime suspend here unless the
> device links have been added and all consumers have suspended.
> That is handled separately by the pm_runtime_get_noresume() in
> ufshcd_slave_configure() and the pm_runtime_put() when luns_avail == 1
> in ufshcd_setup_links().
>
>> +}
>> +
>> +static int ufshcd_wl_remove(struct device *dev)
>> +{
>> + pm_runtime_forbid(dev);
>> + return 0;
>> +}
>> +
>> +static const struct dev_pm_ops ufshcd_wl_pm_ops = {
>> +#ifdef CONFIG_PM_SLEEP
>> + .suspend = ufshcd_wl_suspend,
>> + .resume = ufshcd_wl_resume,
>> + .freeze = ufshcd_wl_suspend,
>> + .thaw = ufshcd_wl_resume,
>> + .poweroff = ufshcd_wl_poweroff,
>> + .restore = ufshcd_wl_resume,
>> +#endif
>> + SET_RUNTIME_PM_OPS(ufshcd_wl_runtime_suspend, ufshcd_wl_runtime_resume, NULL)
>> +};
>> +
>> +/**
>> + * ufs_dev_wlun_template - describes ufs device wlun
>> + * ufs-device wlun - used to send pm commands
>> + * All luns are consumers of ufs-device wlun.
>> + *
>> + * Currently, no sd driver is present for wluns.
>> + * Hence the no specific pm operations are performed.
>> + * With ufs design, SSU should be sent to ufs-device wlun.
>> + * Hence register a scsi driver for ufs wluns only.
>> + */
>> +static struct scsi_driver ufs_dev_wlun_template = {
>> + .gendrv = {
>> + .name = "ufs_device_wlun",
>> + .owner = THIS_MODULE,
>> + .probe = ufshcd_wl_probe,
>> + .remove = ufshcd_wl_remove,
>> + .pm = &ufshcd_wl_pm_ops,
>> + .shutdown = ufshcd_wl_shutdown,
>> + },
>> +};
>> +
>> +static int ufshcd_rpmb_probe(struct device *dev)
>> +{
>> + return is_rpmb_wlun(to_scsi_device(dev)) ? 0 : -ENODEV;
>> +}
>> +
>> +static inline int ufshcd_clear_rpmb_uac(struct ufs_hba *hba)
>> +{
>> + int ret = 0;
>> +
>> + if (!hba->wlun_rpmb_clr_ua)
>> + return 0;
>> + ret = ufshcd_clear_ua_wlun(hba, UFS_UPIU_RPMB_WLUN);
>> + if (!ret)
>> + hba->wlun_rpmb_clr_ua = 0;
>> + return ret;
>> +}
>> +
>> +static int ufshcd_rpmb_runtime_resume(struct device *dev)
>> +{
>> + struct ufs_hba *hba = wlun_dev_to_hba(dev);
>> +
>> + if (hba->sdev_rpmb)
>> + return ufshcd_clear_rpmb_uac(hba);
>> + return 0;
>> +}
>> +
>> +static int ufshcd_rpmb_resume(struct device *dev)
>> +{
>> + struct ufs_hba *hba = wlun_dev_to_hba(dev);
>> +
>> + if (hba->sdev_rpmb && !pm_runtime_suspended(dev))
>> + return ufshcd_clear_rpmb_uac(hba);
>> + return 0;
>> +}
>> +
>> +static const struct dev_pm_ops ufs_rpmb_pm_ops = {
>> + SET_RUNTIME_PM_OPS(NULL, ufshcd_rpmb_runtime_resume, NULL)
>> + SET_SYSTEM_SLEEP_PM_OPS(NULL, ufshcd_rpmb_resume)
>> +};
>> +
>> +/**
>> + * Describes the ufs rpmb wlun.
>> + * Used only to send uac.
>> + */
>> +static struct scsi_driver ufs_rpmb_wlun_template = {
>> + .gendrv = {
>> + .name = "ufs_rpmb_wlun",
>> + .owner = THIS_MODULE,
>> + .probe = ufshcd_rpmb_probe,
>> + .pm = &ufs_rpmb_pm_ops,
>> + },
>> +};
>> +
>> static int __init ufshcd_core_init(void)
>> {
>> + int ret;
>> +
>> ufs_debugfs_init();
>> +
>> + ret = scsi_register_driver(&ufs_dev_wlun_template.gendrv);
>> + if (ret) {
>> + ufs_debugfs_exit();
>> + return ret;
>> + }
>> + ret = scsi_register_driver(&ufs_rpmb_wlun_template.gendrv);
>> + if (ret) {
>> + ufs_debugfs_exit();
>> + scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
>> + return ret;
>> + }
>> return 0;
>> }
>>
>> static void __exit ufshcd_core_exit(void)
>> {
>> ufs_debugfs_exit();
>> + scsi_unregister_driver(&ufs_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..7841b2a 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 +844,7 @@ struct ufs_hba {
>> #ifdef CONFIG_DEBUG_FS
>> struct dentry *debugfs_root;
>> #endif
>> + u32 luns_avail;
>> };
>>
>> /* Returns true if clocks can be gated. Otherwise false */
>> @@ -1100,6 +1104,8 @@ 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,
>>
>

--
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