Commit 88a92d6a authored by Can Guo's avatar Can Guo Committed by Martin K. Petersen
Browse files

scsi: ufs: Serialize eh_work with system PM events and async scan 

Serialize eh_work with system PM events and async scan to make sure eh_work
does not run in parallel with them.

Link: https://lore.kernel.org/r/1606910644-21185-2-git-send-email-cang@codeaurora.org


Reviewed-by: default avatarStanley Chu <stanley.chu@mediatek.com>
Reviewed-by: default avatarAsutosh Das <asutoshd@codeaurora.org>
Reviewed-by: default avatarHongwu Su <hongwus@codeaurora.org>
Signed-off-by: default avatarCan Guo <cang@codeaurora.org>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 5b44a07b

drivers/scsi/ufs/ufshcd.c

+40 −24
Original line number Diff line number Diff line
@@ -5648,7 +5648,9 @@ 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
@@ -5663,7 +5665,8 @@ 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_SYSTEM_PM : UFS_RUNTIME_PM;

		ufshcd_vops_resume(hba, pm_op);

	} else {

		ufshcd_hold(hba, false);

		if (hba->clk_scaling.is_allowed) {
@@ -5684,7 +5687,7 @@ 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))));

}
@@ -5697,6 +5700,7 @@ 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.
@@ -5755,11 +5759,13 @@ 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);
@@ -5767,20 +5773,18 @@ 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;
@@ -5788,17 +5792,10 @@ 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))) {
@@ -5818,8 +5815,14 @@ 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,
@@ -5927,12 +5930,11 @@ skip_err_handling: 
			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);

}



/**
@@ -6911,6 +6913,7 @@ 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;

	}
@@ -7815,8 +7818,10 @@ 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;
@@ -8846,6 +8851,7 @@ 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;
@@ -8876,6 +8882,8 @@ out: 
		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);
@@ -8892,8 +8900,10 @@ 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))

		/*
@@ -8909,6 +8919,7 @@ out: 
		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);
@@ -9000,6 +9011,7 @@ int ufshcd_shutdown(struct ufs_hba *hba) 
{

	int ret = 0;



	down(&hba->eh_sem);

	if (!hba->is_powered)

		goto out;
@@ -9016,6 +9028,8 @@ 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;

}
@@ -9210,6 +9224,8 @@ 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);

drivers/scsi/ufs/ufshcd.h

+1 −0
Original line number Diff line number Diff line
@@ -749,6 +749,7 @@ 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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