From d0ca70c0339838198a704b15b7e6c3318f887536 Mon Sep 17 00:00:00 2001 From: Matthew Brost Date: Tue, 9 Jan 2024 17:24:38 -0800 Subject: [PATCH] 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 Signed-off-by: Matthew Brost Reviewed-by: Lucas De Marchi --- drivers/gpu/drm/xe/xe_gt_pagefault.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/xe/xe_gt_pagefault.c b/drivers/gpu/drm/xe/xe_gt_pagefault.c index 3ca715e2ec19e..13183088401f6 100644 --- 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; -- 2.30.2