The top of stolen memory is WOPCM, which shouldn't be accessed. Remove
this portion from the stolen memory region for discrete platforms.
This was already done for integrated, but was missing for discrete
platforms.
This also moves get_wopcm_size() so detect_bar2_dgfx() and
detect_bar2_integrated can use the same function.
v2: Improve commit message and suitable stable version tag(Lucas)
Fixes: d8b52a02cb40 ("drm/xe: Implement stolen memory.")
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v6.11+
Reviewed-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20250210143654.2076747-1-nirmoy.das@xxxxxxxxx
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
(cherry picked from commit 2c7f45cc7e197a792ce5c693e56ea48f60b312da)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
diff --git a/drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c b/drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c
index 423856cc18d4..d414421f8c13 100644
--- a/drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c
+++ b/drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c
@@ -57,38 +57,6 @@ bool xe_ttm_stolen_cpu_access_needs_ggtt(struct xe_device *xe)
return GRAPHICS_VERx100(xe) < 1270 && !IS_DGFX(xe);
}
-static s64 detect_bar2_dgfx(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr)
-{
- struct xe_tile *tile = xe_device_get_root_tile(xe);
- struct xe_mmio *mmio = xe_root_tile_mmio(xe);
- struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
- u64 stolen_size;
- u64 tile_offset;
- u64 tile_size;
-
- tile_offset = tile->mem.vram.io_start - xe->mem.vram.io_start;
- tile_size = tile->mem.vram.actual_physical_size;
-
- /* Use DSM base address instead for stolen memory */
- mgr->stolen_base = (xe_mmio_read64_2x32(mmio, DSMBASE) & BDSM_MASK) - tile_offset;
- if (drm_WARN_ON(&xe->drm, tile_size < mgr->stolen_base))
- return 0;
-
- stolen_size = tile_size - mgr->stolen_base;
-
- /* Verify usage fits in the actual resource available */
- if (mgr->stolen_base + stolen_size <= pci_resource_len(pdev, LMEM_BAR))
- mgr->io_base = tile->mem.vram.io_start + mgr->stolen_base;
-
- /*
- * There may be few KB of platform dependent reserved memory at the end
- * of vram which is not part of the DSM. Such reserved memory portion is
- * always less then DSM granularity so align down the stolen_size to DSM
- * granularity to accommodate such reserve vram portion.
- */
- return ALIGN_DOWN(stolen_size, SZ_1M);
-}
-
static u32 get_wopcm_size(struct xe_device *xe)
{
u32 wopcm_size;
@@ -112,6 +80,44 @@ static u32 get_wopcm_size(struct xe_device *xe)
return wopcm_size;
}
+static s64 detect_bar2_dgfx(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr)
+{
+ struct xe_tile *tile = xe_device_get_root_tile(xe);
+ struct xe_mmio *mmio = xe_root_tile_mmio(xe);
+ struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+ u64 stolen_size, wopcm_size;
+ u64 tile_offset;
+ u64 tile_size;
+
+ tile_offset = tile->mem.vram.io_start - xe->mem.vram.io_start;
+ tile_size = tile->mem.vram.actual_physical_size;
+
+ /* Use DSM base address instead for stolen memory */
+ mgr->stolen_base = (xe_mmio_read64_2x32(mmio, DSMBASE) & BDSM_MASK) - tile_offset;
+ if (drm_WARN_ON(&xe->drm, tile_size < mgr->stolen_base))
+ return 0;
+
+ /* Carve out the top of DSM as it contains the reserved WOPCM region */
+ wopcm_size = get_wopcm_size(xe);
+ if (drm_WARN_ON(&xe->drm, !wopcm_size))
+ return 0;
+
+ stolen_size = tile_size - mgr->stolen_base;
+ stolen_size -= wopcm_size;
+
+ /* Verify usage fits in the actual resource available */
+ if (mgr->stolen_base + stolen_size <= pci_resource_len(pdev, LMEM_BAR))
+ mgr->io_base = tile->mem.vram.io_start + mgr->stolen_base;
+
+ /*
+ * There may be few KB of platform dependent reserved memory at the end
+ * of vram which is not part of the DSM. Such reserved memory portion is
+ * always less then DSM granularity so align down the stolen_size to DSM
+ * granularity to accommodate such reserve vram portion.
+ */
+ return ALIGN_DOWN(stolen_size, SZ_1M);
+}
+
static u32 detect_bar2_integrated(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr)
{
struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
