On Thu, Jul 31, 2025 at 3:33 AM Philipp Zabel <philipp.za...@gmail.com> wrote:
>
> 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.za...@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 &&
I think the offset of this register varies across chip families.
You'll need some way to determine what the offset is for each family.
Alex
> + 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
>
