[PATCH RFC 5/6] drm/amdgpu: don't wake up the GPU for mmGB_ADDR_CONFIG register read
Philipp Zabel
philipp.zabel at gmail.com
Thu Jul 31 05:36:38 UTC 2025
Don't wake the GPU if libdrm queries the mmGB_ADDR_CONFIG register
value during amdgpu_query_gpu_info_init(). Instead, return the already
cached value adev->gfx.config.gb_addr_config.
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2295
Signed-off-by: Philipp Zabel <philipp.zabel at gmail.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index fe1347a4075c4..ed4d7d72f2065 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -883,6 +883,16 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
alloc_size = info->read_mmr_reg.count * sizeof(*regs);
+ if (info->read_mmr_reg.dword_offset == 0x263e &&
+ info->read_mmr_reg.count == 1) {
+ /* Return cached value of mmGB_ADDR_CONFIG */
+ regs[0] = adev->gfx.config.gb_addr_config;
+
+ n = copy_to_user(out, regs, min(size, alloc_size));
+ kfree(regs);
+ return n ? -EFAULT : 0;
+ }
+
ret = pm_runtime_get_sync(dev->dev);
if (ret < 0) {
pm_runtime_put_autosuspend(dev->dev);
--
2.50.1
More information about the dri-devel
mailing list