From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Benjamin Kelenyi <benjamin@wendy.sh>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: Vinayak Katoch <vinayak.katoch@oss.qualcomm.com>,
Ekansh Gupta <ekansh.gupta@oss.qualcomm.com>,
Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>,
Christopher Obbard <chris.obbard@oss.qualcomm.com>,
Abel Vesa <abel.vesa@oss.qualcomm.com>,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: agatti: Make the ADSP remote heap no-map
Date: Tue, 13 Oct 2026 12:42:32 +0200 [thread overview]
Message-ID: <8a5e7e29-4c15-4547-a6b2-c6ed529b13f6@oss.qualcomm.com> (raw)
In-Reply-To: <20261001085247.1897991-1-benjamin@wendy.sh>
On 10/1/26 10:52 AM, Benjamin Kelenyi wrote:
> The ADSP remote heap is declared as a reusable CMA pool. The ADSP has no
> IOMMU, so fastrpc hands the whole region to the DSP with
> qcom_scm_assign_mem() when it probes, while CMA keeps lending the pool's
> pages to movable allocations. Once memory runs low the kernel touches a
> page the DSP now owns, and the board resets without an oops.
>
> On an Arduino UNO Q (QRB2210, 4 GB), writing and reading back 3.5 GB
> through the page cache resets the board within seconds. With fastrpc
> blacklisted, or with the heap declared no-map, the same test passes
> repeatedly.
>
> Declare the heap no-map, so the kernel never uses it, as the other
> platforms' remote heaps are.
>
> Fixes: 3fbf3b85bf86 ("arm64: dts: qcom: agatti: Add memory-region for audio PD")
> Link: https://lore.kernel.org/all/20260908070331.2189A1F00A3A@smtp.kernel.org/
> Signed-off-by: Benjamin Kelenyi <benjamin@wendy.sh>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Konrad
next prev parent reply other threads:[~2026-10-13 10:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-01 8:52 Benjamin Kelenyi
2026-10-13 10:42 ` Konrad Dybcio [this message]
2026-10-13 16:35 ` Christopher Obbard
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