linux-kernel - Re: [PATCH] drm/amdgpu: Remove GC HW IP 9.3.0 from noretry=1

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Date: Fri, 17 May 2024 08:35:03 +0200
From: Christian König <christian.koenig@....com>
To: Tim Van Patten <timvp@...omium.org>, LKML <linux-kernel@...r.kernel.org>
Cc: alexander.deucher@....com, prathyushi.nangia@....com,
 Tim Van Patten <timvp@...gle.com>, Daniel Vetter <daniel@...ll.ch>,
 David Airlie <airlied@...il.com>, Felix Kuehling <Felix.Kuehling@....com>,
 Ikshwaku Chauhan <ikshwaku.chauhan@....com>, Le Ma <le.ma@....com>,
 Lijo Lazar <lijo.lazar@....com>,
 Mario Limonciello <mario.limonciello@....com>,
 "Pan, Xinhui" <Xinhui.Pan@....com>, "Shaoyun.liu" <Shaoyun.liu@....com>,
 Shiwu Zhang <shiwu.zhang@....com>,
 Srinivasan Shanmugam <srinivasan.shanmugam@....com>,
 amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/amdgpu: Remove GC HW IP 9.3.0 from noretry=1

Am 16.05.24 um 19:57 schrieb Tim Van Patten:
> From: Tim Van Patten <timvp@...gle.com>
>
> The following commit updated gmc->noretry from 0 to 1 for GC HW IP
> 9.3.0:
>
>      commit 5f3854f1f4e2 ("drm/amdgpu: add more cases to noretry=1")
>
> This causes the device to hang when a page fault occurs, until the
> device is rebooted. Instead, revert back to gmc->noretry=0 so the device
> is still responsive.

Wait a second. Why does the device hang on a page fault? That shouldn't 
happen independent of noretry.

So that strongly sounds like this is just hiding a bug elsewhere.

Regards,
Christian.

>
> Fixes: 5f3854f1f4e2 ("drm/amdgpu: add more cases to noretry=1")
> Signed-off-by: Tim Van Patten <timvp@...gle.com>
> ---
>
>   drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 1 -
>   1 file changed, 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
> index be4629cdac049..bff54a20835f1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
> @@ -876,7 +876,6 @@ void amdgpu_gmc_noretry_set(struct amdgpu_device *adev)
>   	struct amdgpu_gmc *gmc = &adev->gmc;
>   	uint32_t gc_ver = amdgpu_ip_version(adev, GC_HWIP, 0);
>   	bool noretry_default = (gc_ver == IP_VERSION(9, 0, 1) ||
> -				gc_ver == IP_VERSION(9, 3, 0) ||
>   				gc_ver == IP_VERSION(9, 4, 0) ||
>   				gc_ver == IP_VERSION(9, 4, 1) ||
>   				gc_ver == IP_VERSION(9, 4, 2) ||