kernel/linux.git/drivers/gpu/drm/amd/amdgpu, branch v6.12.102

gpu: Move DRM buddy allocator one level up (part two)

2026-08-03T09:17:33+00:00

[ Upstream commit ba110db8e1bc206c13fd7d985e79b033f53bfdea ] Move the DRM buddy allocator one level up so that it can be used by GPU drivers (example, nova-core) that have usecases other than DRM (such as VFIO vGPU support). Modify the API, structures and Kconfigs to use "gpu_buddy" terminology. Adapt the drivers and tests to use the new API. The commit cannot be split due to bisectability, however no functional change is intended. Verified by running K-UNIT tests and build tested various configurations. Signed-off-by: Joel Fernandes Reviewed-by: Dave Airlie [airlied: I've split this into two so git can find copies easier. I've also just nuked drm_random library, that stuff needs to be done elsewhere and only the buddy tests seem to be using it]. Signed-off-by: Dave Airlie Stable-dep-of: 56bc6384314f ("gpu/buddy: bail out of try_harder when alignment cannot be honoured") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

drm/amdgpu: fix aperture mapping leak

2026-08-03T09:17:28+00:00

commit ea772a440d56b285f4d491affac50ecd41f6b402 upstream. 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: 9d0af8b4def0 ("drm/amdgpu: pre-map device buffer as cached for A+A config") Signed-off-by: Asad Kamal Reviewed-by: Christian König Reviewed-by: Lijo Lazar Signed-off-by: Alex Deucher (cherry picked from commit d871e99879cb5fd1fa798b006b4888887e63a17a) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

drm/amdgpu: invoke pm_genpd_remove() before freeing genpd

2026-08-03T09:17:28+00:00

commit 28c9b3c5dc35cc790d11e26ca3fc6e068be63998 upstream. Call pm_genpd_remove() to unregister from global list prior to releasing acp_genpd memory, and clear the pointer after free. Signed-off-by: Ce Sun Reviewed-by: Tao Zhou Signed-off-by: Alex Deucher (cherry picked from commit cd8650d7a91ee8b768e202354672553faa5cc1f2) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

drm/amdgpu: fix division by zero with invalid uvd dimensions

2026-08-03T09:17:28+00:00

commit 0c01c811be47e6b146552dd59bfedbea8f09b8f4 upstream. When width or height is less than 16, width_in_mb or height_in_mb becomes 0, leading to fs_in_mb being 0. This causes a division by zero when calculating num_dpb_buffer in H264 and H264 Perf decode paths. Add validation to reject frames with width < 16 or height < 16 before performing any calculations that depend on these values. V2: Format change - move up all vaiable definitions. V3: Use warn_once to avoid spam. Signed-off-by: Boyuan Zhang Reviewed-by: Leo Liu Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher (cherry picked from commit 3e41d26c70b0a459d041cc19482a226c4b7423cb) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

drm/amdgpu/vcn4: avoid rereading IB param length

2026-08-03T09:17:28+00:00

commit 3b4082fabc67c9780b06eb959e59dd92fa79c0f0 upstream. Reuse the parameter length returned by vcn_v4_0_enc_find_ib_param() instead of rereading it from the IB. This avoids a potential TOCTOU issue if the IB contents change between reads. Signed-off-by: Boyuan Zhang Reviewed-by: David Rosca Signed-off-by: Alex Deucher (cherry picked from commit dbb02b4755f8c1f3773263f2d779872c1c0c073a) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

drm/amdgpu/vce: fix integer overflow in image size

2026-08-03T09:17:28+00:00

commit 186bfdc4e26d019b2e7570cb121964a1d89b2e5b upstream. Fix a security vulnerability where malicious VCE command streams with oversized dimensions (e.g. 65536×65536) cause 32-bit integer overflow, wrapping the calculated buffer size to 0. This bypasses validation and allows GPU firmware to perform out-of-bound memory access. The fix uses 64-bit arithmetic to detect overflow and rejects invalid dimensions before they reach the hardware. V2: remove redundant check V3: modify max height value V4: remove size64 Signed-off-by: Boyuan Zhang Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher (cherry picked from commit cbe408dba581755ad1279a487ec786d8927d778d) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

drm/amdgpu/sdma4.4.2: replace BUG_ON() with WARN_ON()

2026-08-03T09:17:28+00:00

commit 40cdbe9fa424cc6264a7aed93a04bd7d69109d9e upstream. There's no need to crash the kernel for these cases. Reviewed-by: Vitaly Prosyak Signed-off-by: Alex Deucher (cherry picked from commit fa4f86a148271e325e95287630a3a15a9cd35fdc) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

drm/amdgpu/gfx9: replace BUG_ON() with WARN_ON()

2026-08-03T09:17:28+00:00

commit 6302be10b521f5106ce01eb5a724b9e7945a5061 upstream. There's no need to crash the kernel for these cases. Reviewed-by: Vitaly Prosyak Signed-off-by: Alex Deucher (cherry picked from commit b71604f8685b0eba07866f4e8dc30f93e1931054) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

drm/amdgpu/gfx9.4.3: replace BUG_ON() with WARN_ON()

2026-08-03T09:17:28+00:00

commit 00f4050f7c367d7bdce347ca279ce467c434cf15 upstream. There's no need to crash the kernel for these cases. Reviewed-by: Vitaly Prosyak Signed-off-by: Alex Deucher (cherry picked from commit 5676593d08998d7a6d9e2d51d6b54b3820e3755c) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

drm/amdgpu/gfx8: drop unecessary BUG_ON()

2026-08-03T09:17:28+00:00

commit 84a1a8a952ab4b8c23c5dd1f2eea4049cb4914f5 upstream. There's no need to crash the kernel for this case. Reviewed-by: Vitaly Prosyak Signed-off-by: Alex Deucher (cherry picked from commit 4d7c25208ca612b754f3bf39e9f16e725b828891) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman