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 && + 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
