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Message-ID: <2f26e027aa583c511126d0af437d2d6a@codeaurora.org>
Date: Wed, 02 Dec 2020 16:20:01 +0800
From: Can Guo <cang@...eaurora.org>
To: Stanley Chu <stanley.chu@...iatek.com>
Cc: asutoshd@...eaurora.org, nguyenb@...eaurora.org,
hongwus@...eaurora.org, rnayak@...eaurora.org,
linux-scsi@...r.kernel.org, kernel-team@...roid.com,
saravanak@...gle.com, salyzyn@...gle.com,
Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Bean Huo <beanhuo@...ron.com>,
Bart Van Assche <bvanassche@....org>,
Satya Tangirala <satyat@...gle.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] scsi: ufs: Serialize eh_work with system PM events
and async scan
On 2020-12-02 15:31, Stanley Chu wrote:
> Hi Can,
>
> On Tue, 2020-12-01 at 19:47 -0800, Can Guo wrote:
>> Serialize eh_work with system PM events and async scan to make sure
>> eh_work
>> does not run in parallel with them.
>>
>> Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>
>> Reviewed-by: Hongwu Su<hongwus@...eaurora.org>
>> Signed-off-by: Can Guo <cang@...eaurora.org>
>> ---
>> drivers/scsi/ufs/ufshcd.c | 64
>> +++++++++++++++++++++++++++++------------------
>> drivers/scsi/ufs/ufshcd.h | 1 +
>> 2 files changed, 41 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 1d8134e..7e764e8 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -5597,7 +5597,9 @@ static inline void
>> ufshcd_schedule_eh_work(struct ufs_hba *hba)
>> static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
>> {
>> pm_runtime_get_sync(hba->dev);
>> - if (pm_runtime_suspended(hba->dev)) {
>> + if (pm_runtime_status_suspended(hba->dev) || hba->is_sys_suspended)
>> {
>> + enum ufs_pm_op pm_op;
>> +
>> /*
>> * Don't assume anything of pm_runtime_get_sync(), if
>> * resume fails, irq and clocks can be OFF, and powers
>> @@ -5612,7 +5614,8 @@ static void ufshcd_err_handling_prepare(struct
>> ufs_hba *hba)
>> if (!ufshcd_is_clkgating_allowed(hba))
>> ufshcd_setup_clocks(hba, true);
>> ufshcd_release(hba);
>> - ufshcd_vops_resume(hba, UFS_RUNTIME_PM);
>> + pm_op = hba->is_sys_suspended ? UFS_RUNTIME_PM : UFS_SYSTEM_PM;
>
> Perhaps typo here? Shall be as below?
>
> pm_op = hba->is_sys_suspended ? UFS_SYSTEM_PM : UFS_RUNTIME_PM;
>
> Otherwise looks good to me.
You are right. Will update it in next version.
Thanks,
Can Guo.
>
> Thanks,
> Stanley Chu
>
>> + ufshcd_vops_resume(hba, pm_op);
>> } else {
>> ufshcd_hold(hba, false);
>> if (hba->clk_scaling.is_allowed) {
>> @@ -5633,7 +5636,7 @@ static void ufshcd_err_handling_unprepare(struct
>> ufs_hba *hba)
>>
>> static inline bool ufshcd_err_handling_should_stop(struct ufs_hba
>> *hba)
>> {
>> - return (hba->ufshcd_state == UFSHCD_STATE_ERROR ||
>> + return (!hba->is_powered || hba->ufshcd_state == UFSHCD_STATE_ERROR
>> ||
>> (!(hba->saved_err || hba->saved_uic_err || hba->force_reset ||
>> ufshcd_is_link_broken(hba))));
>> }
>> @@ -5646,6 +5649,7 @@ static void ufshcd_recover_pm_error(struct
>> ufs_hba *hba)
>> struct request_queue *q;
>> int ret;
>>
>> + hba->is_sys_suspended = false;
>> /*
>> * Set RPM status of hba device to RPM_ACTIVE,
>> * this also clears its runtime error.
>> @@ -5704,11 +5708,13 @@ static void ufshcd_err_handler(struct
>> work_struct *work)
>>
>> hba = container_of(work, struct ufs_hba, eh_work);
>>
>> + down(&hba->eh_sem);
>> spin_lock_irqsave(hba->host->host_lock, flags);
>> if (ufshcd_err_handling_should_stop(hba)) {
>> if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
>> hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
>> spin_unlock_irqrestore(hba->host->host_lock, flags);
>> + up(&hba->eh_sem);
>> return;
>> }
>> ufshcd_set_eh_in_progress(hba);
>> @@ -5716,20 +5722,18 @@ static void ufshcd_err_handler(struct
>> work_struct *work)
>> ufshcd_err_handling_prepare(hba);
>> spin_lock_irqsave(hba->host->host_lock, flags);
>> ufshcd_scsi_block_requests(hba);
>> - /*
>> - * A full reset and restore might have happened after preparation
>> - * is finished, double check whether we should stop.
>> - */
>> - if (ufshcd_err_handling_should_stop(hba)) {
>> - if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
>> - hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
>> - goto out;
>> - }
>> hba->ufshcd_state = UFSHCD_STATE_RESET;
>>
>> /* Complete requests that have door-bell cleared by h/w */
>> ufshcd_complete_requests(hba);
>>
>> + /*
>> + * A full reset and restore might have happened after preparation
>> + * is finished, double check whether we should stop.
>> + */
>> + if (ufshcd_err_handling_should_stop(hba))
>> + goto skip_err_handling;
>> +
>> if (hba->dev_quirks & UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS)
>> {
>> bool ret;
>>
>> @@ -5737,17 +5741,10 @@ static void ufshcd_err_handler(struct
>> work_struct *work)
>> /* release the lock as ufshcd_quirk_dl_nac_errors() may sleep */
>> ret = ufshcd_quirk_dl_nac_errors(hba);
>> spin_lock_irqsave(hba->host->host_lock, flags);
>> - if (!ret && !hba->force_reset && ufshcd_is_link_active(hba))
>> + if (!ret && ufshcd_err_handling_should_stop(hba))
>> goto skip_err_handling;
>> }
>>
>> - if (hba->force_reset || ufshcd_is_link_broken(hba) ||
>> - ufshcd_is_saved_err_fatal(hba) ||
>> - ((hba->saved_err & UIC_ERROR) &&
>> - (hba->saved_uic_err & (UFSHCD_UIC_DL_NAC_RECEIVED_ERROR |
>> - UFSHCD_UIC_DL_TCx_REPLAY_ERROR))))
>> - needs_reset = true;
>> -
>> if ((hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK))
>> ||
>> (hba->saved_uic_err &&
>> (hba->saved_uic_err != UFSHCD_UIC_PA_GENERIC_ERROR))) {
>> @@ -5767,8 +5764,14 @@ static void ufshcd_err_handler(struct
>> work_struct *work)
>> * transfers forcefully because they will get cleared during
>> * host reset and restore
>> */
>> - if (needs_reset)
>> + if (hba->force_reset || ufshcd_is_link_broken(hba) ||
>> + ufshcd_is_saved_err_fatal(hba) ||
>> + ((hba->saved_err & UIC_ERROR) &&
>> + (hba->saved_uic_err & (UFSHCD_UIC_DL_NAC_RECEIVED_ERROR |
>> + UFSHCD_UIC_DL_TCx_REPLAY_ERROR)))) {
>> + needs_reset = true;
>> goto do_reset;
>> + }
>>
>> /*
>> * If LINERESET was caught, UFS might have been put to PWM mode,
>> @@ -5876,12 +5879,11 @@ static void ufshcd_err_handler(struct
>> work_struct *work)
>> dev_err_ratelimited(hba->dev, "%s: exit: saved_err 0x%x
>> saved_uic_err 0x%x",
>> __func__, hba->saved_err, hba->saved_uic_err);
>> }
>> -
>> -out:
>> ufshcd_clear_eh_in_progress(hba);
>> spin_unlock_irqrestore(hba->host->host_lock, flags);
>> ufshcd_scsi_unblock_requests(hba);
>> ufshcd_err_handling_unprepare(hba);
>> + up(&hba->eh_sem);
>> }
>>
>> /**
>> @@ -6856,6 +6858,7 @@ static int ufshcd_reset_and_restore(struct
>> ufs_hba *hba)
>> */
>> scsi_report_bus_reset(hba->host, 0);
>> if (err) {
>> + hba->ufshcd_state = UFSHCD_STATE_ERROR;
>> hba->saved_err |= saved_err;
>> hba->saved_uic_err |= saved_uic_err;
>> }
>> @@ -7704,8 +7707,10 @@ static void ufshcd_async_scan(void *data,
>> async_cookie_t cookie)
>> struct ufs_hba *hba = (struct ufs_hba *)data;
>> int ret;
>>
>> + down(&hba->eh_sem);
>> /* Initialize hba, detect and initialize UFS device */
>> ret = ufshcd_probe_hba(hba, true);
>> + up(&hba->eh_sem);
>> if (ret)
>> goto out;
>>
>> @@ -8718,6 +8723,7 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
>> int ret = 0;
>> ktime_t start = ktime_get();
>>
>> + down(&hba->eh_sem);
>> if (!hba || !hba->is_powered)
>> return 0;
>>
>> @@ -8748,6 +8754,8 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
>> hba->curr_dev_pwr_mode, hba->uic_link_state);
>> if (!ret)
>> hba->is_sys_suspended = true;
>> + else
>> + up(&hba->eh_sem);
>> return ret;
>> }
>> EXPORT_SYMBOL(ufshcd_system_suspend);
>> @@ -8764,8 +8772,10 @@ int ufshcd_system_resume(struct ufs_hba *hba)
>> int ret = 0;
>> ktime_t start = ktime_get();
>>
>> - if (!hba)
>> + if (!hba) {
>> + up(&hba->eh_sem);
>> return -EINVAL;
>> + }
>>
>> if (!hba->is_powered || pm_runtime_suspended(hba->dev))
>> /*
>> @@ -8781,6 +8791,7 @@ int ufshcd_system_resume(struct ufs_hba *hba)
>> hba->curr_dev_pwr_mode, hba->uic_link_state);
>> if (!ret)
>> hba->is_sys_suspended = false;
>> + up(&hba->eh_sem);
>> return ret;
>> }
>> EXPORT_SYMBOL(ufshcd_system_resume);
>> @@ -8872,6 +8883,7 @@ int ufshcd_shutdown(struct ufs_hba *hba)
>> {
>> int ret = 0;
>>
>> + down(&hba->eh_sem);
>> if (!hba->is_powered)
>> goto out;
>>
>> @@ -8888,6 +8900,8 @@ int ufshcd_shutdown(struct ufs_hba *hba)
>> out:
>> if (ret)
>> dev_err(hba->dev, "%s failed, err %d\n", __func__, ret);
>> + hba->is_powered = false;
>> + up(&hba->eh_sem);
>> /* allow force shutdown even in case of errors */
>> return 0;
>> }
>> @@ -9082,6 +9096,8 @@ int ufshcd_init(struct ufs_hba *hba, void
>> __iomem *mmio_base, unsigned int irq)
>> INIT_WORK(&hba->eh_work, ufshcd_err_handler);
>> INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);
>>
>> + sema_init(&hba->eh_sem, 1);
>> +
>> /* Initialize UIC command mutex */
>> mutex_init(&hba->uic_cmd_mutex);
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index 47eb143..1e680bf 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -728,6 +728,7 @@ struct ufs_hba {
>> u32 intr_mask;
>> u16 ee_ctrl_mask;
>> bool is_powered;
>> + struct semaphore eh_sem;
>>
>> /* Work Queues */
>> struct workqueue_struct *eh_wq;
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