linux-kernel - How to fix Linux CMA on x86 with internal graphic card i915/hda

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Date: Mon, 25 Mar 2024 19:13:56 +0000
From: "Suesens, Sebastian" <sebastian.suesens@...ss.com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: How to fix Linux CMA on x86 with internal graphic card i915/hda_intel
 ioremap error?

Hello,
I enabled the CMA (CONFIG_CMA=y) for an x86 machine on Linux kernel v5.10 and v5.15 When I boot the system the CMA reserved memory, but when the graphic card driver i915 or hda_intel is loaded the system crashed. 
I see that ioremap on RAM at 0x0000000000000000 - 0x00000000d0000000 get fail. When I blacklist the i915 and hda_intel module the system boots fine with cma memory reserved.

I think this has something to do with the shared memory which this driver use.

Does anyone know if a kernel config or something else prevents this crash?

Please answer me in CC.

Regards Sebastian