linux-kernel - [PATCH 2/2] drm/amdgpu: Bypass resizing bars for PVH dom0

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Message-ID: <20241105060531.3503788-3-Jiqian.Chen@amd.com>
Date: Tue, 5 Nov 2024 14:05:31 +0800
From: Jiqian Chen <Jiqian.Chen@....com>
To: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>, Xinhui Pan
	<Xinhui.Pan@....com>
CC: <amd-gfx@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>, Jiqian Chen
	<Jiqian.Chen@....com>, Huang Rui <Ray.Huang@....com>
Subject: [PATCH 2/2] drm/amdgpu: Bypass resizing bars for PVH dom0

VPCI of Xen doesn't support resizable bar. When discrete GPU is used on
PVH dom0 which using the VPCI, amdgpu fails to probe, so we need to
disable this capability for PVH dom0.

Signed-off-by: Jiqian Chen <Jiqian.Chen@....com>
Reviewed-by: Huang Rui <Ray.Huang@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index b3fb92bbd9e2..012feb3790dd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1619,6 +1619,10 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
 	if (!IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT))
 		return 0;
 
+	/* Bypass for PVH dom0 which doesn't support resizable bar */
+	if (xen_initial_domain() && xen_pvh_domain())
+		return 0;
+
 	/* Bypass for VF */
 	if (amdgpu_sriov_vf(adev))
 		return 0;
-- 
2.34.1