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drm/amdgpu: fix aperture mapping leak

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amdgpu_pci_remove() calls drm_dev_unplug() before invoking the driver
fini routines. This causes drm_dev_enter() in amdgpu_ttm_fini() to
always return false, so iounmap(aper_base_kaddr) never runs on normal
driver unload, leaving an orphaned entry in the x86 PAT interval tree.

On connected_to_cpu hardware, the aperture is mapped write-back (WB) via
ioremap_cache(). On reload, IP discovery calls memremap(..., MEMREMAP_WC)
over the same range. The WC vs WB conflict causes:

  ioremap error for 0x..., requested 0x1, got 0x0
  amdgpu: discovery failed: -2

Fix by switching to devres-managed mappings so cleanup is guaranteed
regardless of drm_dev_enter() state:

- connected_to_cpu path: devm_memremap(MEMREMAP_WB). For
  IORESOURCE_SYSTEM_RAM ranges this takes the try_ram_remap() shortcut,
  returning __va(offset) from the existing kernel direct map. No new
  ioremap VA or PAT entry is created, so there is nothing to orphan.

- dGPU path: devm_ioremap_wc() registers iounmap() as a devres action,
  guaranteeing cleanup at device_del() time.

Also remove iounmap(aper_base_kaddr) from amdgpu_device_unmap_mmio()
since the mapping is now devres-owned.

v2: Remove redundant x86_64 guard (Lijo)

Fixes: 9d0af8b4de ("drm/amdgpu: pre-map device buffer as cached for A+A config")
Signed-off-by: Asad Kamal <asad.kamal@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit d871e99879cb5fd1fa798b006b4888887e63a17a)
Cc: stable@vger.kernel.org
This commit is contained in:
Asad Kamal 2026-06-14 12:50:28 +08:00 committed by Alex Deucher
parent f87f926395
commit ea772a440d
2 changed files with 16 additions and 22 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View File

@ -4184,8 +4184,6 @@ static void amdgpu_device_unmap_mmio(struct amdgpu_device *adev)
iounmap(adev->rmmio);
adev->rmmio = NULL;
if (adev->mman.aper_base_kaddr)
iounmap(adev->mman.aper_base_kaddr);
adev->mman.aper_base_kaddr = NULL;
/* Memory manager related */

36
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
View File

@ -2118,18 +2118,23 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
/* Change the size here instead of the init above so only lpfn is affected */
amdgpu_ttm_disable_buffer_funcs(adev);
#ifdef CONFIG_64BIT
#ifdef CONFIG_X86
if (adev->gmc.xgmi.connected_to_cpu)
adev->mman.aper_base_kaddr = ioremap_cache(adev->gmc.aper_base,
adev->gmc.visible_vram_size);
else if (adev->gmc.is_app_apu)
if (adev->gmc.xgmi.connected_to_cpu) {
void *kaddr = devm_memremap(adev->dev, adev->gmc.aper_base,
adev->gmc.visible_vram_size,
MEMREMAP_WB);
if (IS_ERR(kaddr))
return PTR_ERR(kaddr);
adev->mman.aper_base_kaddr = (__force void __iomem *)kaddr;
} else if (adev->gmc.is_app_apu) {
DRM_DEBUG_DRIVER(
"No need to ioremap when real vram size is 0\n");
else
#endif
adev->mman.aper_base_kaddr = ioremap_wc(adev->gmc.aper_base,
adev->gmc.visible_vram_size);
} else {
adev->mman.aper_base_kaddr = devm_ioremap_wc(adev->dev,
adev->gmc.aper_base,
adev->gmc.visible_vram_size);
if (!adev->mman.aper_base_kaddr)
return -ENOMEM;
}
#endif
amdgpu_ttm_init_vram_resv_regions(adev);
@ -2246,8 +2251,6 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
*/
void amdgpu_ttm_fini(struct amdgpu_device *adev)
{
int idx;
if (!adev->mman.initialized)
return;
@ -2270,14 +2273,7 @@ void amdgpu_ttm_fini(struct amdgpu_device *adev)
amdgpu_ttm_unmark_vram_reserved(adev, AMDGPU_RESV_FW_VRAM_USAGE);
amdgpu_ttm_unmark_vram_reserved(adev, AMDGPU_RESV_DRV_VRAM_USAGE);
if (drm_dev_enter(adev_to_drm(adev), &idx)) {
if (adev->mman.aper_base_kaddr)
iounmap(adev->mman.aper_base_kaddr);
adev->mman.aper_base_kaddr = NULL;
drm_dev_exit(idx);
}
adev->mman.aper_base_kaddr = NULL;
if (!adev->gmc.is_app_apu)
amdgpu_vram_mgr_fini(adev);