[PATCH 089/159] drm/amdgpu: Don't do FB resize under A+A config

Alex Deucher alexander.deucher at amd.com
Wed Feb 24 22:17:49 UTC 2021

From: Oak Zeng <Oak.Zeng at amd.com>

Disable PCIe BAR resizing on A+A config. It's not needed because we won't use the
PCIe BAR, but it breaks the PCI BAR configuration with the current SBIOS.

Error message of FB BAR resize failure under A+A:

[  154.913731] [drm:amdgpu_device_resize_fb_bar [amdgpu]] *ERROR* Problem resizing BAR0 (-22).

Signed-off-by: Oak Zeng <Oak.Zeng at amd.com>
Reviewed-by: Amber Lin <Amber.Lin at amd.com>
Reviewed-by: Felix Kuehling <Felix.kuehling at amd.com>
Reviewed-by: Christian Koenig <Christian.Koenig at amd.com>
Tested-by: Amber Lin <Amber.Lin at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 6009aee49fa6..53c09aa4e159 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1249,7 +1249,8 @@ static int gmc_v9_0_mc_init(struct amdgpu_device *adev)
 		adev->nbio.funcs->get_memsize(adev) * 1024ULL * 1024ULL;
 	adev->gmc.real_vram_size = adev->gmc.mc_vram_size;
-	if (!(adev->flags & AMD_IS_APU)) {
+	if (!(adev->flags & AMD_IS_APU) &&
+	    !adev->gmc.xgmi.connected_to_cpu) {
 		r = amdgpu_device_resize_fb_bar(adev);
 		if (r)
 			return r;

More information about the amd-gfx mailing list