| Message ID | 1605596660-2987-2-git-send-email-cang@codeaurora.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Fix some racing problems btw err_handler and paths like system PM ops and the task abort callback | expand |
On 2020-11-17 15:04, 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. > > Signed-off-by: Can Guo <cang@codeaurora.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; > + 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; Reviewed-by: Hongwu Su<hongwus@codeaurora.org>
On 11/16/2020 11:04 PM, 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. > > Signed-off-by: Can Guo <cang@codeaurora.org> > --- Reviewed-by: Asutosh Das <asutoshd@codeaurora.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; > + 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; >
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; + 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;
Serialize eh_work with system PM events and async scan to make sure eh_work does not run in parallel with them. Signed-off-by: Can Guo <cang@codeaurora.org> --- drivers/scsi/ufs/ufshcd.c | 64 +++++++++++++++++++++++++++++------------------ drivers/scsi/ufs/ufshcd.h | 1 + 2 files changed, 41 insertions(+), 24 deletions(-)