drm/xe/vram: fix ccs offset calculation

Spec says SW is expected to round up to the nearest 128K, if not already
aligned for the CC unit view of CCS. We are seeing the assert sometimes
pop on BMG to tell us that there is a hole between GSM and CCS, as well
as popping other asserts with having a vram size with strange alignment,
which is likely caused by misaligned offset here.

v2 (Shuicheng):
 - Do the round_up() on final SW address.

BSpec: 68023
Fixes: b5c2ca0 ("drm/xe/xe2hpg: Determine flat ccs offset for vram")
Signed-off-by: Matthew Auld <[email protected]>
Cc: Himal Prasad Ghimiray <[email protected]>
Cc: Akshata Jahagirdar <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: Shuicheng Lin <[email protected]>
Cc: Matt Roper <[email protected]>
Cc: [email protected] # v6.10+
Reviewed-by: Himal Prasad Ghimiray <[email protected]>
Tested-by: Shuicheng Lin <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Lucas De Marchi <[email protected]>
(cherry picked from commit 3717339)
Signed-off-by: Lucas De Marchi <[email protected]>

Author: matt-auld

drivers/gpu/drm/xe/xe_vram.c

@@ -182,6 +182,7 @@ static inline u64 get_flat_ccs_offset(struct xe_gt *gt, u64 tile_size)
 		offset = offset_hi << 32; /* HW view bits 39:32 */
 		offset |= offset_lo << 6; /* HW view bits 31:6 */
 		offset *= num_enabled; /* convert to SW view */
+		offset = round_up(offset, SZ_128K); /* SW must round up to nearest 128K */
 
 		/* We don't expect any holes */
 		xe_assert_msg(xe, offset == (xe_mmio_read64_2x32(gt, GSMBASE) - ccs_size),