[PATCH] PM: Restrict swap use to later in the suspend sequence

[Rafael J. Wysocki]

On Mon, Jun 23, 2025 at 8:25 AM Lucian Langa <lucilanga at 7pot.org> wrote:
>
> On 13.06.2025 16:43, Mario Limonciello wrote:
> > From: Mario Limonciello <mario.limonciello at amd.com>
> >
> > Currently swap is restricted before drivers have had a chance to do their
> > prepare() PM callbacks. Restricting swap this early means that if a driver
> > needs to evict some content from memory into sawp in it's prepare callback
> > it won't be able to.
> >
> > On AMD dGPUs this can lead to failed suspends under memory pressure
> > situations as all VRAM must be evicted to system memory or swap.
> >
> > Move the swap restriction to right after all devices have had a chance to
> > do the prepare() callback.  If there is any problem with the sequence,
> > restore swap in the appropriate dpm resume callbacks or error handling
> > paths.
> >
> > Closes: https://github.com/ROCm/ROCK-Kernel-Driver/issues/174
> > Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/2362
> > Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
>
> Tested this against 6.15.3 and 6.16-rc3.
> Adding my tag.
>
> Tested-by: Lucian Langa <lucilanga at 7pot.org>

Applied as 6.16-rc material, thanks!