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Subject[PATCH 5.3 30/95] drm/amdgpu: disable gfxoff when using register read interface
Date
From: Alex Deucher <alexander.deucher@amd.com>

commit c57040d333c6729ce99c2cb95061045ff84c89ea upstream.

When gfxoff is enabled, accessing gfx registers via MMIO
can lead to a hang.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=205497
Acked-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -635,15 +635,19 @@ static int amdgpu_info_ioctl(struct drm_
return -ENOMEM;
alloc_size = info->read_mmr_reg.count * sizeof(*regs);

- for (i = 0; i < info->read_mmr_reg.count; i++)
+ amdgpu_gfx_off_ctrl(adev, false);
+ for (i = 0; i < info->read_mmr_reg.count; i++) {
if (amdgpu_asic_read_register(adev, se_num, sh_num,
info->read_mmr_reg.dword_offset + i,
&regs[i])) {
DRM_DEBUG_KMS("unallowed offset %#x\n",
info->read_mmr_reg.dword_offset + i);
kfree(regs);
+ amdgpu_gfx_off_ctrl(adev, true);
return -EFAULT;
}
+ }
+ amdgpu_gfx_off_ctrl(adev, true);
n = copy_to_user(out, regs, min(size, alloc_size));
kfree(regs);
return n ? -EFAULT : 0;

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