linux-kernel - Re: [Linaro-mm-sig] [PATCH AUTOSEL 6.13 15/34] drm/amdgpu: allow pinning DMA-bufs into VRAM if all importers can do P2P

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Message-ID: <aA7E2ZKr_5rOpmWM@lappy>
Date: Sun, 27 Apr 2025 19:59:21 -0400
From: Sasha Levin <sashal@...nel.org>
To: Alex Deucher <alexdeucher@...il.com>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Christian König <christian.koenig@....com>,
	Simona Vetter <simona.vetter@...ll.ch>,
	Felix Kuehling <felix.kuehling@....com>,
	Pak Nin Lui <pak.lui@....com>,
	Alex Deucher <alexander.deucher@....com>, simona@...ll.ch,
	sumit.semwal@...aro.org, Yunxiang.Li@....com,
	tvrtko.ursulin@...lia.com, matthew.auld@...el.com,
	amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [Linaro-mm-sig] [PATCH AUTOSEL 6.13 15/34] drm/amdgpu: allow
 pinning DMA-bufs into VRAM if all importers can do P2P

On Mon, Apr 14, 2025 at 09:48:10AM -0400, Alex Deucher wrote:
>On Mon, Apr 14, 2025 at 9:28 AM Sasha Levin <sashal@...nel.org> wrote:
>>
>> From: Christian König <christian.koenig@....com>
>>
>> [ Upstream commit f5e7fabd1f5c65b2e077efcdb118cfa67eae7311 ]
>>
>> Try pinning into VRAM to allow P2P with RDMA NICs without ODP
>> support if all attachments can do P2P. If any attachment can't do
>> P2P just pin into GTT instead.
>>
>> Acked-by: Simona Vetter <simona.vetter@...ll.ch>
>> Signed-off-by: Christian König <christian.koenig@....com>
>> Signed-off-by: Felix Kuehling <felix.kuehling@....com>
>> Reviewed-by: Felix Kuehling <felix.kuehling@....com>
>> Tested-by: Pak Nin Lui <pak.lui@....com>
>> Cc: Simona Vetter <simona.vetter@...ll.ch>
>> Signed-off-by: Alex Deucher <alexander.deucher@....com>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>
>This should not go to stable.  It depends on dmem cgroups.

I'll drop it.

-- 
Thanks,
Sasha