linux-kernel - [PATCH 1/1] PCI (& drm/amdgpu): BAR to be excluded depends on HW generation

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Message-Id: <20251114103053.13778-1-ilpo.jarvinen@linux.intel.com>
Date: Fri, 14 Nov 2025 12:30:53 +0200
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
	Christian König <christian.koenig@....com>,
	linux-pci@...r.kernel.org,
	Alex Deucher <alexander.deucher@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 1/1] PCI (& drm/amdgpu): BAR to be excluded depends on HW generation

Depending on HW generation, BAR that needs to be excluded from
pci_resize_resource() is either 2 or 5.

Suggested-by: Christian König <christian.koenig@....com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---

This change should be be folded into the commit 73cd7ee85e78 ("PCI: Fix
restoring BARs on BAR resize rollback path") in the pci/resource branch.

Also the changelog should be changed: "(BAR 5)" -> "(BAR 2 or 5)".

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 4e241836ae68..bf0bc38e1c47 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1736,7 +1736,9 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
 
 	pci_release_resource(adev->pdev, 0);
 
-	r = pci_resize_resource(adev->pdev, 0, rbar_size, 1 << 5);
+	r = pci_resize_resource(adev->pdev, 0, rbar_size,
+				(adev->asic_type >= CHIP_BONAIRE) ? 1 << 5
+								  : 1 << 2);
 	if (r == -ENOSPC)
 		dev_info(adev->dev,
 			 "Not enough PCI address space for a large BAR.");

base-commit: 73cd7ee85e788bc2541bfce2500e3587cf79f081
-- 
2.39.5