drm/amdgpu: fix aperture mapping leak

Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: fix aperture mapping leak

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)

(cherry picked from commit d871e99879cb5fd1fa798b006b4888887e63a17a)

Affected

• Linux >= 9d0af8b4def0de6b734ec8db08e96da0458facb6 < 8cf4724ea4f23c438af87a6cd0582a3372d30da9
• Linux >= 9d0af8b4def0de6b734ec8db08e96da0458facb6 < 67bc3647e418e23dc0d17604bdba634a73de809f
• Linux >= 9d0af8b4def0de6b734ec8db08e96da0458facb6 < a343d028ad6c174da8dc6af560c51e6d140a6727
• Linux >= 9d0af8b4def0de6b734ec8db08e96da0458facb6 < 6405c4e75b3bcf0e72bd7a0ff5f1ed0c475e23aa
• Linux >= 9d0af8b4def0de6b734ec8db08e96da0458facb6 < f5988b5c300a32ff751724ffd33d5a8d5873e4a7
• Linux >= 9d0af8b4def0de6b734ec8db08e96da0458facb6 < ea772a440d56b285f4d491affac50ecd41f6b402
• Linux 5.13

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.