linux-kernel - [PATCH v2 4/6] drm/amdgpu: Limit info in coredump for kernel threads

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Date:   Thu, 13 Jul 2023 18:32:40 -0300
From:   André Almeida <andrealmeid@...lia.com>
To:     dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     kernel-dev@...lia.com, alexander.deucher@....com,
        christian.koenig@....com, pierre-eric.pelloux-prayer@....com,
        'Marek Olšák' <maraeo@...il.com>,
        Samuel Pitoiset <samuel.pitoiset@...il.com>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        Timur Kristóf <timur.kristof@...il.com>,
        michel.daenzer@...lbox.org,
        André Almeida <andrealmeid@...lia.com>
Subject: [PATCH v2 4/6] drm/amdgpu: Limit info in coredump for kernel threads

If a kernel thread caused the reset, the information available to be
logged will be limited, so return early in the dump function.

Signed-off-by: André Almeida <andrealmeid@...lia.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index e80670420586..07546781b8b8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4988,10 +4988,14 @@ static ssize_t amdgpu_devcoredump_read(char *buffer, loff_t offset,
 	drm_printf(&p, "kernel: " UTS_RELEASE "\n");
 	drm_printf(&p, "module: " KBUILD_MODNAME "\n");
 	drm_printf(&p, "time: %lld.%09ld\n", coredump->reset_time.tv_sec, coredump->reset_time.tv_nsec);
-	if (coredump->reset_task_info.pid)
+	if (coredump->reset_task_info.pid) {
 		drm_printf(&p, "process_name: %s PID: %d\n",
 			   coredump->reset_task_info.process_name,
 			   coredump->reset_task_info.pid);
+	} else {
+		drm_printf(&p, "GPU reset caused by a kernel thread\n");
+		return count - iter.remain;
+	}
 
 	if (coredump->reset_vram_lost)
 		drm_printf(&p, "VRAM is lost due to GPU reset!\n");
-- 
2.41.0