On Wed, Jan 16, 2013 at 10:30:45AM -0500, Alan Stern wrote:
> On Wed, 16 Jan 2013, Aaron Lu wrote:
>
> > From: Lin Ming
> >
> > When a request is added:
> > If device is suspended or is suspending and the request is not a
> > PM request, resume the device.
> >
> > When the last request
On 01/11/2013 01:12 PM, Thadeu Lima de Souza Cascardo wrote:
> When doing a hotplug remove of a cxgb4 device, there are still dandling
> symlinks at /sys/class/scsi_host/hostX to the removed PCI device. The
> upper layer device may also try to send data, which may crash the
> system.
>
> The DETAC
On Wed, Jan 16, 2013 at 10:30:45AM -0500, Alan Stern wrote:
> On Wed, 16 Jan 2013, Aaron Lu wrote:
>
> > From: Lin Ming
> >
> > When a request is added:
> > If device is suspended or is suspending and the request is not a
> > PM request, resume the device.
> >
> > When the last request
On Wed, Jan 16, 2013 at 10:32:35AM +, James Bottomley wrote:
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index 6b2fb87..ab88c5b 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -809,7 +809,7 @@ static void dma_cache_maint_page(struct pag
On Wed, Jan 16, 2013 at 10:32:35AM +, James Bottomley wrote:
> On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
>
> > Now consider this call stack from MMC block driver (this is on the ARmv7
> > based board):
> > [ 98.918174] [] (v7_dma_inv_range+0x30/0x48) from
> > [] (dma_
On Wed, 16 Jan 2013, James Bottomley wrote:
> On Tue, 2013-01-15 at 17:20 +0800, Aaron Lu wrote:
> > This patch adds runtime pm support for sr.
> >
> > It did this by increasing the runtime usage_count of the device when:
> > - its block device is opened;
> > - the events checking is to run.
> >
On Fri, Jan 11, 2013 at 6:00 PM, Subhash Jadavani
wrote:
> On 1/11/2013 4:11 PM, Sujit Reddy Thumma wrote:
>>
>> On 1/9/2013 5:41 PM, vinayak holikatti wrote:
>>>
>>> On Mon, Jan 7, 2013 at 1:11 PM, Sujit Reddy Thumma
>>> wrote:
Hi Vinayak,
I have few comments below:
On Tue, 2013-01-15 at 17:20 +0800, Aaron Lu wrote:
> This patch adds runtime pm support for sr.
>
> It did this by increasing the runtime usage_count of the device when:
> - its block device is opened;
> - the events checking is to run.
>
> And decreasing the runtime usage_count of the device whe
On Wed, 16 Jan 2013, Aaron Lu wrote:
> From: Lin Ming
>
> When a request is added:
> If device is suspended or is suspending and the request is not a
> PM request, resume the device.
>
> When the last request finishes:
> Call pm_runtime_mark_last_busy().
>
> When pick a request:
>
On 1/16/2013 4:02 PM, James Bottomley wrote:
On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
Now consider this call stack from MMC block driver (this is on the ARmv7
based board):
[ 98.918174] [] (v7_dma_inv_range+0x30/0x48) from
[] (dma_cache_maint_page+0x1c4/0x24c)
[
On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
> Now consider this call stack from MMC block driver (this is on the ARmv7
> based board):
> [ 98.918174] [] (v7_dma_inv_range+0x30/0x48) from
> [] (dma_cache_maint_page+0x1c4/0x24c)
> [ 98.927819] [] (dma_cache_maint_page+
On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
> On 1/15/2013 9:49 PM, James Bottomley wrote:
> > On Tue, 2013-01-15 at 21:31 +0530, Subhash Jadavani wrote:
> >> blk_rq_map_sg() function merges the physically contiguous pages to use same
> >> scatter-gather node without checking if thei
In August 2010, Jens and Alan discussed about "Runtime PM and the block
layer". http://marc.info/?t=12825910841&r=1&w=2
And then Alan has given a detailed implementation guide:
http://marc.info/?l=linux-scsi&m=133727953625963&w=2
To test:
# ls -l /sys/block/sda
/sys/devices/pci:00/:00:
From: Lin Ming
Add runtime pm helper functions:
void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
- Initialization function for drivers to call.
int blk_pre_runtime_suspend(struct request_queue *q)
- If any requests are in the queue, mark last busy and return -EBUSY.
From: Lin Ming
Add a flag REQ_PM to identify the request is PM related, such requests
will not change the device request queue's runtime status. It is
intended to be used in driver's runtime PM callback, so that driver can
perform some IO to the device there with the queue's runtime status
unaffe
From: Lin Ming
Uses block layer runtime pm helper functions in
scsi_runtime_suspend/resume.
Remove scsi_autopm_* from sd open/release path and check_events path.
And remove the quiesce call in runtime suspend path, as we know there is
no request to quiesce for the device.
Signed-off-by: Lin Ming
From: Lin Ming
When a request is added:
If device is suspended or is suspending and the request is not a
PM request, resume the device.
When the last request finishes:
Call pm_runtime_mark_last_busy().
When pick a request:
If device is resuming/suspending, then only PM request i
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