On Wed, Feb 23, 2022 at 05:05:23PM +, Robin Murphy wrote:
> On 2022-02-23 16:03, Greg Kroah-Hartman wrote:
> > On Wed, Feb 23, 2022 at 10:30:11AM -0400, Jason Gunthorpe wrote:
> > > On Wed, Feb 23, 2022 at 10:09:01AM -0400, Jason Gunthorpe wrote:
> > > > On Wed, Feb 23, 2022 at 03:06:35PM
On 2022-02-23 16:03, Greg Kroah-Hartman wrote:
On Wed, Feb 23, 2022 at 10:30:11AM -0400, Jason Gunthorpe wrote:
On Wed, Feb 23, 2022 at 10:09:01AM -0400, Jason Gunthorpe wrote:
On Wed, Feb 23, 2022 at 03:06:35PM +0100, Greg Kroah-Hartman wrote:
On Wed, Feb 23, 2022 at 09:46:27AM -0400, Jason
On Wed, Feb 23, 2022 at 10:30:11AM -0400, Jason Gunthorpe wrote:
> On Wed, Feb 23, 2022 at 10:09:01AM -0400, Jason Gunthorpe wrote:
> > On Wed, Feb 23, 2022 at 03:06:35PM +0100, Greg Kroah-Hartman wrote:
> > > On Wed, Feb 23, 2022 at 09:46:27AM -0400, Jason Gunthorpe wrote:
> > > > On Wed, Feb 23,
On Wed, Feb 23, 2022 at 10:09:01AM -0400, Jason Gunthorpe wrote:
> On Wed, Feb 23, 2022 at 03:06:35PM +0100, Greg Kroah-Hartman wrote:
> > On Wed, Feb 23, 2022 at 09:46:27AM -0400, Jason Gunthorpe wrote:
> > > On Wed, Feb 23, 2022 at 01:04:00PM +, Robin Murphy wrote:
> > >
> > > > 1 -
On Wed, Feb 23, 2022 at 03:06:35PM +0100, Greg Kroah-Hartman wrote:
> On Wed, Feb 23, 2022 at 09:46:27AM -0400, Jason Gunthorpe wrote:
> > On Wed, Feb 23, 2022 at 01:04:00PM +, Robin Murphy wrote:
> >
> > > 1 - tmp->driver is non-NULL because tmp is already bound.
> > > 1.a - If
On Wed, Feb 23, 2022 at 09:46:27AM -0400, Jason Gunthorpe wrote:
> On Wed, Feb 23, 2022 at 01:04:00PM +, Robin Murphy wrote:
>
> > 1 - tmp->driver is non-NULL because tmp is already bound.
> > 1.a - If tmp->driver->driver_managed_dma == 0, the group must currently be
> > DMA-API-owned as a
On Wed, Feb 23, 2022 at 01:04:00PM +, Robin Murphy wrote:
> 1 - tmp->driver is non-NULL because tmp is already bound.
> 1.a - If tmp->driver->driver_managed_dma == 0, the group must currently be
> DMA-API-owned as a whole. Regardless of what driver dev has unbound from,
> its removal does
On 2022-02-23 05:01, Lu Baolu wrote:
On 2/23/22 7:53 AM, Jason Gunthorpe wrote:
To spell it out, the scheme I'm proposing looks like this:
Well, I already got this, it is what is in driver_or_DMA_API_token()
that matters
I think you are suggesting to do something like:
if
On 2/23/22 7:53 AM, Jason Gunthorpe wrote:
To spell it out, the scheme I'm proposing looks like this:
Well, I already got this, it is what is in driver_or_DMA_API_token()
that matters
I think you are suggesting to do something like:
if (!READ_ONCE(dev->driver) || ???)
return
On Tue, Feb 22, 2022 at 09:18:23PM +, Robin Murphy wrote:
> > Still not sure I see what you are thinking though..
>
> What part of "How hard is it to hold group->mutex when reading or writing
> group->owner?" sounded like "complex lockless algorithm", exactly?
group->owner is not the issue,
On 2022-02-22 15:16, Jason Gunthorpe wrote:
On Tue, Feb 22, 2022 at 10:58:37AM +, Robin Murphy wrote:
On 2022-02-21 23:48, Jason Gunthorpe wrote:
On Mon, Feb 21, 2022 at 08:43:33PM +, Robin Murphy wrote:
On 2022-02-19 07:32, Christoph Hellwig wrote:
So we are back to the callback
On Tue, Feb 22, 2022 at 10:58:37AM +, Robin Murphy wrote:
> On 2022-02-21 23:48, Jason Gunthorpe wrote:
> > On Mon, Feb 21, 2022 at 08:43:33PM +, Robin Murphy wrote:
> > > On 2022-02-19 07:32, Christoph Hellwig wrote:
> > > > So we are back to the callback madness instead of the nice and
On 2022-02-21 23:48, Jason Gunthorpe wrote:
On Mon, Feb 21, 2022 at 08:43:33PM +, Robin Murphy wrote:
On 2022-02-19 07:32, Christoph Hellwig wrote:
So we are back to the callback madness instead of the nice and simple
flag? Sigh.
TBH, I *think* this part could be a fair bit simpler. It
On 2/22/22 7:48 AM, Jason Gunthorpe wrote:
since we should only care about ownership at probe, hotplug, and other
places well outside critical fast-paths, I'm not sure we really need to keep
track of that anyway - it can always be recalculated by walking the
group->devices list,
It has to be
On Mon, Feb 21, 2022 at 08:43:33PM +, Robin Murphy wrote:
> On 2022-02-19 07:32, Christoph Hellwig wrote:
> > So we are back to the callback madness instead of the nice and simple
> > flag? Sigh.
>
> TBH, I *think* this part could be a fair bit simpler. It looks like this
> whole callback
On 2022-02-19 07:32, Christoph Hellwig wrote:
So we are back to the callback madness instead of the nice and simple
flag? Sigh.
TBH, I *think* this part could be a fair bit simpler. It looks like this
whole callback mess is effectively just to decrement group->owner_cnt,
but since we should
So we are back to the callback madness instead of the nice and simple
flag? Sigh.
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The bus_type structure defines dma_configure() callback for bus drivers
to configure DMA on the devices. This adds the paired dma_cleanup()
callback and calls it during driver unbinding so that bus drivers can do
some cleanup work.
One use case for this paired DMA callbacks is for the bus driver
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