drm/xe: Add build on bug to assert access counter queue works

If ACC_QUEUE_NUM_DW % ACC_MSG_LEN_DW != 0 then the access counter queue
logic does not work when wrapping occurs. Add a build bug on to assert
ACC_QUEUE_NUM_DW % ACC_MSG_LEN_DW == 0 to enforce this restriction and
document the code.

v2:
- s/NUM_ACC_QUEUE/ACC_QUEUE_NUM_DW (Brian)

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_gt_pagefault.c b/drivers/gpu/drm/xe/xe_gt_pagefault.c
index 3ca715e..1318308 100644 (file)
--- a/drivers/gpu/drm/xe/xe_gt_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_gt_pagefault.c
@@ -629,6 +629,11 @@ int xe_guc_access_counter_notify_handler(struct xe_guc *guc, u32 *msg, u32 len)
        u32 asid;
        bool full;
 
+       /*
+        * The below logic doesn't work unless ACC_QUEUE_NUM_DW % ACC_MSG_LEN_DW == 0
+        */
+       BUILD_BUG_ON(ACC_QUEUE_NUM_DW % ACC_MSG_LEN_DW);
+
        if (unlikely(len != ACC_MSG_LEN_DW))
                return -EPROTO;