[Intel-xe] [PATCH 1/1] drm/xe: Fix stolen memory size calculation

[Aravind Iddamsetty]

The stolen memory base should be derived from GSMBASE or
FLAT_CCS_BASE_ADDR when flat ccs is applicable.

Fixes: acf067c2f5a5 ("drm/xe: Implement stolen memory.")

Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty at intel.com>
---
 drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c b/drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c
index 21ecc734f10a..29ce69bf8200 100644
--- a/drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c
+++ b/drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c
@@ -54,7 +54,6 @@ bool xe_ttm_stolen_cpu_access_needs_ggtt(struct xe_device *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_gt *mmio = xe_root_mmio_gt(xe);
 	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
 	u64 stolen_size;
 	u64 tile_offset;
@@ -66,12 +65,12 @@ static s64 detect_bar2_dgfx(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr)
 		return 0;
 	}
 
-	/* Use DSM base address instead for stolen memory */
-	mgr->stolen_base = (xe_mmio_read64(mmio, DSMBASE) & BDSM_MASK) - tile_offset;
+	/* stolen base should be at end of usable vram */
+	mgr->stolen_base = vram_size;
 	if (drm_WARN_ON(&xe->drm, tile_size < mgr->stolen_base))
 		return 0;
 
-	stolen_size = tile_size - mgr->stolen_base;
+	stolen_size = tile_size - vram_size;
 
 	/* Verify usage fits in the actual resource available */
 	if (mgr->stolen_base + stolen_size <= pci_resource_len(pdev, GEN12_LMEM_BAR))
-- 
2.25.1