From: Adrian Hunter <adrian.hunter@intel.com> To: Ming Lei <ming.lei@redhat.com> Cc: "Martin K . Petersen" <martin.petersen@oracle.com>, "James E . J . Bottomley" <jejb@linux.vnet.ibm.com>, Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>, Johannes Thumshirn <jthumshirn@suse.de>, Bart Van Assche <Bart.VanAssche@wdc.com>, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Stanislav Nijnikov <stanislav.nijnikov@wdc.com>, Evan Green <evgreen@chromium.org>, Vinayak Holikatti <vinholikatti@gmail.com>, Janek Kotas <jank@cadence.com>, Vivek Gautam <vivek.gautam@codeaurora.org>, Asutosh Das <asutoshd@codeaurora.org>, Subhash Jadavani <subhashj@codeaurora.org>, Sayali Lokhande <sayalil@codeaurora.org>, Li Wei <liwei213@huawei.com>, Bjorn Andersson <bjorn.andersson@linaro.org>, Jaegeuk Kim <jaegeuk@kernel.org>, Alim Akhtar <alim.akhtar@samsung.com>, Alex Lemberg <Alex.Lemberg@sandisk.com> Subject: Re: [PATCH RFC] scsi: ufs: Disable blk-mq for now Date: Thu, 13 Sep 2018 15:15:39 +0300 [thread overview] Message-ID: <e4d0c716-006a-72cb-0240-4ae5749b21b8@intel.com> (raw) In-Reply-To: <20180913120459.GA4965@ming.t460p> On 13/09/18 15:05, Ming Lei wrote: > On Thu, Sep 13, 2018 at 02:28:48PM +0300, Adrian Hunter wrote: >> blk-mq does not support runtime pm, so disable blk-mq support for now. > > So could you describe a bit what the issue you are trying to fix? UFS is a low-power solution, so we must be able to runtime suspend. > > This is host level runtime PM you are trying to address, and if blk-mq > runtime isn't enabled, I guess the host won't be runtime suspended at all > because some of its descendant are always active. > > So seems we need to do nothing for preventing the host controller from > entering runtime suspend. We don't want to prevent the host controller from runtime suspending, quite the opposite.
WARNING: multiple messages have this Message-ID (diff)
From: Adrian Hunter <adrian.hunter@intel.com> To: Ming Lei <ming.lei@redhat.com> Cc: "Martin K . Petersen" <martin.petersen@oracle.com>, "James E . J . Bottomley" <jejb@linux.vnet.ibm.com>, Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>, Johannes Thumshirn <jthumshirn@suse.de>, Bart Van Assche <Bart.VanAssche@wdc.com>, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Stanislav Nijnikov <stanislav.nijnikov@wdc.com>, Evan Green <evgreen@chromium.org>, Vinayak Holikatti <vinholikatti@gmail.com>, Janek Kotas <jank@cadence.com>, Vivek Gautam <vivek.gautam@codeaurora.org>, Asutosh Das <asutoshd@codeaurora.org>, Subhash Jadavani <subhashj@codeaurora.org>, Sayali Lokhande <sayalil@codeaurora.org>, Li Wei <liwei213@huawei.com>, Bjorn Andersson <bjorn.andersson@linaro.org>, Jaegeuk Kim <jaegeuk@kernel.org> Subject: Re: [PATCH RFC] scsi: ufs: Disable blk-mq for now Date: Thu, 13 Sep 2018 15:15:39 +0300 [thread overview] Message-ID: <e4d0c716-006a-72cb-0240-4ae5749b21b8@intel.com> (raw) In-Reply-To: <20180913120459.GA4965@ming.t460p> On 13/09/18 15:05, Ming Lei wrote: > On Thu, Sep 13, 2018 at 02:28:48PM +0300, Adrian Hunter wrote: >> blk-mq does not support runtime pm, so disable blk-mq support for now. > > So could you describe a bit what the issue you are trying to fix? UFS is a low-power solution, so we must be able to runtime suspend. > > This is host level runtime PM you are trying to address, and if blk-mq > runtime isn't enabled, I guess the host won't be runtime suspended at all > because some of its descendant are always active. > > So seems we need to do nothing for preventing the host controller from > entering runtime suspend. We don't want to prevent the host controller from runtime suspending, quite the opposite.
next prev parent reply other threads:[~2018-09-13 12:17 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-09-13 11:28 [PATCH RFC] scsi: ufs: Disable blk-mq for now Adrian Hunter 2018-09-13 12:05 ` Ming Lei 2018-09-13 12:05 ` Ming Lei 2018-09-13 12:15 ` Adrian Hunter [this message] 2018-09-13 12:15 ` Adrian Hunter 2018-09-14 1:52 ` Ming Lei 2018-09-14 1:52 ` Ming Lei 2018-09-14 6:17 ` Adrian Hunter 2018-09-14 6:17 ` Adrian Hunter 2018-09-14 13:03 ` Adrian Hunter 2018-09-14 13:03 ` Adrian Hunter 2018-09-20 6:58 ` Christoph Hellwig 2018-09-20 6:58 ` Christoph Hellwig 2018-09-21 1:59 ` Martin K. Petersen 2018-09-21 1:59 ` Martin K. Petersen
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