linux-kernel - Re: [PATCH 1/1] drm/amdgpu: Fix TLB flush failures after hibernation resume

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Message-ID: <20260126194057.7376-2-sunlightlinux@gmail.com>
Date: Mon, 26 Jan 2026 21:40:48 +0200
From: "Ionut Nechita (Sunlight Linux)" <sunlightlinux@...il.com>
To: christian.koenig@....com
Cc: alexander.deucher@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	ionut_n2001@...oo.com,
	linux-kernel@...r.kernel.org,
	sunlightlinux@...il.com,
	superm1@...nel.org
Subject: Re: [PATCH 1/1] drm/amdgpu: Fix TLB flush failures after hibernation resume

From: Ionut Nechita <sunlightlinux@...il.com>

On Thu, Jan 8 2026 at 13:36, Christian König wrote:

> Question is why the KIQ is not up and running before we do anything with it?

Thank you for the feedback. I completely understand that my patch is
just a workaround and not proper engineering - you're absolutely right
that the real issue is KIQ being marked as ready before it's actually
functional.

I don't have experience with GPU drivers and video subsystems, so I'm
not familiar with the proper initialization sequence for KIQ. I'd prefer
not to keep a workaround for this issue in my tree.

Is there a proper fix available, or could you point me in the right
direction? I'm happy to test any patches on my AMD Cezanne (Renoir)
hardware where I can reliably reproduce the issue after hibernation.

Also, regarding hibernation support: you mentioned that hibernation is
not generally supported with the driver. Should I expect other issues
beyond this TLB flush problem, or is this the main blocker?

Thanks for your time,
Ionut