From: Asutosh Das <asutoshd@codeaurora.org>
To: cang@codeaurora.org, martin.petersen@oracle.com,
adrian.hunter@intel.com, linux-scsi@vger.kernel.org
Cc: Asutosh Das <asutoshd@codeaurora.org>,
linux-arm-msm@vger.kernel.org,
Matthias Brugger <matthias.bgg@gmail.com>,
linux-arm-kernel@lists.infradead.org (moderated
list:ARM/Mediatek SoC support),
linux-mediatek@lists.infradead.org (moderated list:ARM/Mediatek
SoC support)
Subject: [PATCH v11 0/2] Enable power management for ufs wlun
Date: Thu, 11 Mar 2021 14:19:33 -0800 [thread overview]
Message-ID: <cover.1615500685.git.asutoshd@codeaurora.org> (raw)
This patch attempts to fix a deadlock in ufs while sending SSU.
Recently, blk_queue_enter() added a check to not process requests if the
queue is suspended. That leads to a resume of the associated device which
is suspended. In ufs, that device is ufs device wlun and it's parent is
ufs_hba. This resume tries to resume ufs device wlun which in turn tries
to resume ufs_hba, which is already in the process of suspending, thus
causing a deadlock.
This patch takes care of:
* Suspending the ufs device lun only after all other luns are suspended
* Sending SSU during ufs device wlun suspend
* Clearing uac for rpmb and ufs device wlun
* Not sending commands to the device during host suspend
v10 -> v11:
- Fixed supplier suspending before consumer race
- Addressed Adrian's comments
* Added proper resume/suspend cb to ufshcd_auto_hibern8_update()
* Cosmetic changes to ufshcd-pci.c
* Cleaned up ufshcd_system_suspend()
* Added ufshcd_debugfs_eh_exit to ufshcd_core_init()
v9 -> v10:
- Addressed Adrian's comments
* Moved suspend/resume vops to __ufshcd_wl_[suspend/resume]()
* Added correct resume in ufs_bsg
v8 -> v9:
- Addressed Adrian's comments
* Moved link transition to __ufshcd_wl_[suspend/resume]()
* Fixed the other minor comments
v7 -> v8:
- Addressed Adrian's comments
* Removed separate autosuspend delay for ufs-device lun
* Fixed the ee handler getting scheduled during pm
* Always runtime resume in suspend_prepare()
* Added CONFIG_PM_SLEEP where needed
v6 -> v7:
* Resume the ufs device before shutting it down
v5 -> v6:
- Addressed Adrian's comments
* Added complete() cb
* Added suspend_prepare() and complete() to all drivers
* Moved suspend_prepare() and complete() to ufshcd
* .poweroff() uses ufhcd_wl_poweroff()
* Removed several forward declarations
* Moved scsi_register_driver() to ufshcd_core_init()
v4 -> v5:
- Addressed Adrian's comments
* Used the rpmb driver contributed by Adrian
* Runtime-resume the ufs device during suspend to honor spm-lvl
* Unregister the scsi_driver in ufshcd_remove()
* Currently shutdown() puts the ufs device to power-down mode
so, just removed ufshcd_pci_poweroff()
* Quiesce the scsi device during shutdown instead of remove
v3 RFC -> v4:
- Addressed Bart's comments
* Except that I didn't get any checkpatch failures
- Addressed Avri's comments
- Addressed Adrian's comments
* Added a check for deepsleep power mode
* Removed a couple of forward declarations
* Didn't separate the scsi drivers because in rpmb case it just sends uac
in resume and it seemed pretty neat to me.
- Added sysfs changes to resume the devices before accessing
Asutosh Das (2):
scsi: ufs: Enable power management for wlun
ufs: sysfs: Resume the proper scsi device
drivers/scsi/ufs/cdns-pltfrm.c | 2 +
drivers/scsi/ufs/tc-dwc-g210-pci.c | 2 +
drivers/scsi/ufs/ufs-debugfs.c | 5 +
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 | 2 +
drivers/scsi/ufs/ufs-qcom.c | 2 +
drivers/scsi/ufs/ufs-sysfs.c | 30 +-
drivers/scsi/ufs/ufs_bsg.c | 6 +-
drivers/scsi/ufs/ufshcd-pci.c | 36 +--
drivers/scsi/ufs/ufshcd.c | 616 ++++++++++++++++++++++++++-----------
drivers/scsi/ufs/ufshcd.h | 7 +
include/trace/events/ufs.h | 20 ++
14 files changed, 515 insertions(+), 219 deletions(-)
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
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next reply other threads:[~2021-03-11 22:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-11 22:19 Asutosh Das [this message]
2021-03-11 22:19 ` [PATCH v11 1/2] scsi: ufs: Enable power management for wlun Asutosh Das
2021-03-12 18:18 ` Jaegeuk Kim
2021-03-15 14:29 ` Adrian Hunter
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