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Date: Tue, 6 Oct 2020 09:46:25 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Bean Huo <huobean@...il.com>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
"James E . J . Bottomley" <jejb@...ux.ibm.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>
Subject: Re: [PATCH V2] scsi: ufs: Add DeepSleep feature
On 5/10/20 6:46 pm, Bean Huo wrote:
> Hi Adrian
>
> thanks for submitting your patch. this patch looks fine to me.
>
>
> do you think the new deepsleep PM level aslo should be added in
> "rpm_lvl" description in Documentation/ABI/testing/sysfs-driver-ufs?
Thanks for looking at this. Yes, I missed that. Fixed in V3.
>
> Thanks,
> Bean
>
>
> On Mon, 2020-10-05 at 16:04 +0300, Adrian Hunter wrote:
>> DeepSleep is a UFS v3.1 feature that achieves the lowest power
>> consumption
>> of the device, apart from power off.
>>
>> In DeepSleep mode, no commands are accepted, and the only way to exit
>> is
>> using a hardware reset or power cycle.
>>
>> This patch assumes that if a power cycle was an option, then power
>> off
>> would be preferable, so only exit via a hardware reset is supported.
>>
>> Drivers that wish to support DeepSleep need to set a new capability
>> flag
>> UFSHCD_CAP_DEEPSLEEP and provide a hardware reset via the existing
>> ->device_reset() callback.
>>
>> It is assumed that UFS devices with wspecversion >= 0x310 support
>> DeepSleep.
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>> ---
>>
>>
>> Changes in V2:
>>
>>
>> Fix SSU command IMMED setting and consequently drop patch 2.
>>
>>
>> drivers/scsi/ufs/ufs-sysfs.c | 7 +++++++
>> drivers/scsi/ufs/ufs.h | 1 +
>> drivers/scsi/ufs/ufshcd.c | 39
>> ++++++++++++++++++++++++++++++++++--
>> drivers/scsi/ufs/ufshcd.h | 17 +++++++++++++++-
>> include/trace/events/ufs.h | 3 ++-
>> 5 files changed, 63 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-
>> sysfs.c
>> index bdcd27faa054..08e72b7eef6a 100644
>> --- a/drivers/scsi/ufs/ufs-sysfs.c
>> +++ b/drivers/scsi/ufs/ufs-sysfs.c
>> @@ -28,6 +28,7 @@ static const char
>> *ufschd_ufs_dev_pwr_mode_to_string(
>> case UFS_ACTIVE_PWR_MODE: return "ACTIVE";
>> case UFS_SLEEP_PWR_MODE: return "SLEEP";
>> case UFS_POWERDOWN_PWR_MODE: return "POWERDOWN";
>> + case UFS_DEEPSLEEP_PWR_MODE: return "DEEPSLEEP";
>> default: return "UNKNOWN";
>> }
>> }
>> @@ -38,6 +39,7 @@ static inline ssize_t ufs_sysfs_pm_lvl_store(struct
>> device *dev,
>> bool rpm)
>> {
>> struct ufs_hba *hba = dev_get_drvdata(dev);
>> + struct ufs_dev_info *dev_info = &hba->dev_info;
>> unsigned long flags, value;
>>
>> if (kstrtoul(buf, 0, &value))
>> @@ -46,6 +48,11 @@ static inline ssize_t
>> ufs_sysfs_pm_lvl_store(struct device *dev,
>> if (value >= UFS_PM_LVL_MAX)
>> return -EINVAL;
>>
>> + if (ufs_pm_lvl_states[value].dev_state ==
>> UFS_DEEPSLEEP_PWR_MODE &&
>> + (!(hba->caps & UFSHCD_CAP_DEEPSLEEP) ||
>> + !(dev_info->wspecversion >= 0x310)))
>> + return -EINVAL;
>> +
>> spin_lock_irqsave(hba->host->host_lock, flags);
>> if (rpm)
>> hba->rpm_lvl = value;
>> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
>> index f8ab16f30fdc..d593edb48767 100644
>> --- a/drivers/scsi/ufs/ufs.h
>> +++ b/drivers/scsi/ufs/ufs.h
>> @@ -442,6 +442,7 @@ enum ufs_dev_pwr_mode {
>> UFS_ACTIVE_PWR_MODE = 1,
>> UFS_SLEEP_PWR_MODE = 2,
>> UFS_POWERDOWN_PWR_MODE = 3,
>> + UFS_DEEPSLEEP_PWR_MODE = 4,
>> };
>>
>> #define UFS_WB_BUF_REMAIN_PERCENT(val) ((val) / 10)
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index b8f573a02713..ccacf54ed7ef 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -163,6 +163,11 @@ struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
>> {UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE},
>> {UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE},
>> {UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE},
>> + /*
>> + * For DeepSleep, the link is first put in hibern8 and then
>> off.
>> + * Leaving the link in hibern8 is not supported.
>> + */
>> + {UFS_DEEPSLEEP_PWR_MODE, UIC_LINK_OFF_STATE},
>> };
>>
>> static inline enum ufs_dev_pwr_mode
>> @@ -8292,7 +8297,8 @@ static int ufshcd_link_state_transition(struct
>> ufs_hba *hba,
>> }
>> /*
>> * If autobkops is enabled, link can't be turned off because
>> - * turning off the link would also turn off the device.
>> + * turning off the link would also turn off the device, except
>> in the
>> + * case of DeepSleep where the device is expected to remain
>> powered.
>> */
>> else if ((req_link_state == UIC_LINK_OFF_STATE) &&
>> (!check_for_bkops || !hba->auto_bkops_enabled)) {
>> @@ -8302,6 +8308,9 @@ static int ufshcd_link_state_transition(struct
>> ufs_hba *hba,
>> * put the link in low power mode is to send the DME
>> end point
>> * to device and then send the DME reset command to
>> local
>> * unipro. But putting the link in hibern8 is much
>> faster.
>> + *
>> + * Note also that putting the link in Hibern8 is a
>> requirement
>> + * for entering DeepSleep.
>> */
>> ret = ufshcd_uic_hibern8_enter(hba);
>> if (ret) {
>> @@ -8434,6 +8443,7 @@ static void ufshcd_hba_vreg_set_hpm(struct
>> ufs_hba *hba)
>> 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;
>> @@ -8519,7 +8529,13 @@ static int ufshcd_suspend(struct ufs_hba *hba,
>> enum ufs_pm_op pm_op)
>> }
>>
>> flush_work(&hba->eeh_work);
>> - ret = ufshcd_link_state_transition(hba, req_link_state, 1);
>> +
>> + /*
>> + * In the case of DeepSleep, the device is expected to remain
>> powered
>> + * with the link off, so do not check for bkops.
>> + */
>> + 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;
>>
>> @@ -8560,11 +8576,25 @@ static int ufshcd_suspend(struct ufs_hba
>> *hba, enum ufs_pm_op pm_op)
>> if (hba->clk_scaling.is_allowed)
>> ufshcd_resume_clkscaling(hba);
>> 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
>> + * further below.
>> + */
>> + if (ufshcd_is_ufs_dev_deepsleep(hba)) {
>> + ufshcd_vops_device_reset(hba);
>> + WARN_ON(!ufshcd_is_link_off(hba));
>> + }
>> if (ufshcd_is_link_hibern8(hba) &&
>> !ufshcd_uic_hibern8_exit(hba))
>> 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_vops_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:
>> @@ -8626,6 +8656,9 @@ static int ufshcd_resume(struct ufs_hba *hba,
>> enum ufs_pm_op pm_op)
>> if (ret)
>> goto disable_vreg;
>>
>> + /* 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));
>> +
>> if (ufshcd_is_link_hibern8(hba)) {
>> ret = ufshcd_uic_hibern8_exit(hba);
>> if (!ret) {
>> @@ -8639,6 +8672,8 @@ static int ufshcd_resume(struct ufs_hba *hba,
>> enum ufs_pm_op pm_op)
>> /*
>> * A full initialization of the host and the device is
>> * required since the link was put to off during
>> suspend.
>> + * Note, in the case of DeepSleep, the device will exit
>> + * DeepSleep due to device reset.
>> */
>> ret = ufshcd_reset_and_restore(hba);
>> /*
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index 6663325ed8a0..8c6094fb35f4 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -114,16 +114,22 @@ enum uic_link_state {
>> ((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
>> #define ufshcd_set_ufs_dev_poweroff(h) \
>> ((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
>> +#define ufshcd_set_ufs_dev_deepsleep(h) \
>> + ((h)->curr_dev_pwr_mode = UFS_DEEPSLEEP_PWR_MODE)
>> #define ufshcd_is_ufs_dev_active(h) \
>> ((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
>> #define ufshcd_is_ufs_dev_sleep(h) \
>> ((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
>> #define ufshcd_is_ufs_dev_poweroff(h) \
>> ((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)
>> +#define ufshcd_is_ufs_dev_deepsleep(h) \
>> + ((h)->curr_dev_pwr_mode == UFS_DEEPSLEEP_PWR_MODE)
>>
>> /*
>> * UFS Power management levels.
>> - * Each level is in increasing order of power savings.
>> + * Each level is in increasing order of power savings, except
>> DeepSleep
>> + * which is lower than PowerDown with power on but not PowerDown
>> with
>> + * power off.
>> */
>> enum ufs_pm_level {
>> UFS_PM_LVL_0, /* UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE */
>> @@ -132,6 +138,7 @@ enum ufs_pm_level {
>> UFS_PM_LVL_3, /* UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE */
>> UFS_PM_LVL_4, /* UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE
>> */
>> UFS_PM_LVL_5, /* UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE */
>> + UFS_PM_LVL_6, /* UFS_DEEPSLEEP_PWR_MODE, UIC_LINK_OFF_STATE */
>> UFS_PM_LVL_MAX
>> };
>>
>> @@ -591,6 +598,14 @@ enum ufshcd_caps {
>> * inline crypto engine, if it is present
>> */
>> UFSHCD_CAP_CRYPTO = 1 << 8,
>> +
>> + /*
>> + * This capability allows the host controller driver to use
>> DeepSleep,
>> + * if it is supported by the UFS device. The host controller
>> driver must
>> + * support device hardware reset via the hba->device_reset()
>> callback,
>> + * in order to exit DeepSleep state.
>> + */
>> + UFSHCD_CAP_DEEPSLEEP = 1 << 9,
>> };
>>
>> struct ufs_hba_variant_params {
>> diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h
>> index 84841b3a7ffd..2362244c2a9e 100644
>> --- a/include/trace/events/ufs.h
>> +++ b/include/trace/events/ufs.h
>> @@ -19,7 +19,8 @@
>> #define UFS_PWR_MODES \
>> EM(UFS_ACTIVE_PWR_MODE) \
>> EM(UFS_SLEEP_PWR_MODE) \
>> - EMe(UFS_POWERDOWN_PWR_MODE)
>> + EM(UFS_POWERDOWN_PWR_MODE) \
>> + EMe(UFS_DEEPSLEEP_PWR_MODE)
>>
>> #define UFSCHD_CLK_GATING_STATES \
>> EM(CLKS_OFF) \
>
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