[SRU][R][PATCH 1/1] drm/amdgpu: cap GTT size to physical RAM on APUs

[Yo-Jung Leo Lin (AMD)]

From: Harkirat Gill <harkirat.gill at amd.com>

BugLink: https://bugs.launchpad.net/bugs/2162038

On APUs, the GTT pool is backed by system RAM, but its size is not bound
to the non-carveout memory that actually backs it. A user can end up
with GTT + VRAM exceeding total physical memory through the following
sequence:

 - Have a large non-carveout memory space (~128GB) and accordingly set a
   large GTT (~100GB) via the ttm module parameter.
 - Lower the non-carveout memory space in BIOS by increasing the UMA
   Frame Buffer Size (VRAM) to 64GB.
 - The previously set GTT value (~100GB) persists, even though the new
   non-carveout space (64GB) can no longer back it.

This leads to a case where kernel reports GTT (100GB) + VRAM (64GB)
despite the sum being greater than total physical memory (128GB).

Cap the GTT size to totalram_pages() on APUs. totalram_pages() already
excludes the VRAM carveout, so the resulting GTT can never exceed the
system RAM that actually backs it.

Signed-off-by: Harkirat Gill <harkirat.gill at amd.com>
Reviewed-by: David Francis <David.Francis at amd.com>
Assisted-by: Claude:claude-opus-4
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
(cherry picked from commit 5dafdd649280c7dc6c22c8f877da3f54fcc441e1)
Cc: stable at vger.kernel.org
(cherry picked from commit 5e70f6804b4d6256058c360b10e044ee04ea4a4e)
Signed-off-by: Yo-Jung Leo Lin (AMD) <Leo.Lin at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 95060217e3b0..4537861b3a98 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -2150,6 +2150,18 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 		gtt_size = configured_size;
 	}
 
+	/* Cap GTT so that it does not exceed total physical RAM. */
+	if (adev->flags & AMD_IS_APU) {
+		u64 phys_ram = (u64)totalram_pages() << PAGE_SHIFT;
+
+		if (gtt_size > phys_ram) {
+			gtt_size = phys_ram;
+			dev_info(adev->dev,
+				 "Capping GTT to %uM to not exceed available system memory\n",
+				 (unsigned int)(gtt_size / (1024 * 1024)));
+		}
+	}
+
 	/* Initialize GTT memory pool */
 	r = amdgpu_gtt_mgr_init(adev, gtt_size);
 	if (r) {
-- 
2.43.0