On Sun, May 05, 2024 at 08:47:58PM -0700, Matthew Brost wrote:

System work queues are shared, use a dedicated work queue for G2H processing to avoid G2H processing getting block behind system tasks.

Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs") Cc: stable@vger.kernel.org Signed-off-by: Matthew Brost matthew.brost@intel.com

Reviewed-by: Francois Dugast francois.dugast@intel.com

---

drivers/gpu/drm/xe/xe_guc_ct.c | 5 +++++ drivers/gpu/drm/xe/xe_guc_ct.h | 2 +- drivers/gpu/drm/xe/xe_guc_ct_types.h | 2 ++ 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c index 8ac819a7061e..cc60c3333ce3 100644 --- a/drivers/gpu/drm/xe/xe_guc_ct.c +++ b/drivers/gpu/drm/xe/xe_guc_ct.c @@ -121,6 +121,7 @@ static void guc_ct_fini(struct drm_device *drm, void *arg) { struct xe_guc_ct *ct = arg;

• destroy_workqueue(ct->g2h_wq); xa_destroy(&ct->fence_lookup);

} @@ -146,6 +147,10 @@ int xe_guc_ct_init(struct xe_guc_ct *ct) xe_gt_assert(gt, !(guc_ct_size() % PAGE_SIZE));

• ct->g2h_wq = alloc_ordered_workqueue("xe-g2h-wq", 0);
• if(!ct->g2h_wq)

• return -ENOMEM;
  

• spin_lock_init(&ct->fast_lock); xa_init(&ct->fence_lookup); INIT_WORK(&ct->g2h_worker, g2h_worker_func);

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.h b/drivers/gpu/drm/xe/xe_guc_ct.h index 5083e099064f..105bb8e99a8d 100644 --- a/drivers/gpu/drm/xe/xe_guc_ct.h +++ b/drivers/gpu/drm/xe/xe_guc_ct.h @@ -34,7 +34,7 @@ static inline void xe_guc_ct_irq_handler(struct xe_guc_ct *ct) return; wake_up_all(&ct->wq);

• queue_work(system_unbound_wq, &ct->g2h_worker);

• queue_work(ct->g2h_wq, &ct->g2h_worker); xe_guc_ct_fast_path(ct);

} diff --git a/drivers/gpu/drm/xe/xe_guc_ct_types.h b/drivers/gpu/drm/xe/xe_guc_ct_types.h index d29144c9f20b..fede4c6e93cb 100644 --- a/drivers/gpu/drm/xe/xe_guc_ct_types.h +++ b/drivers/gpu/drm/xe/xe_guc_ct_types.h @@ -120,6 +120,8 @@ struct xe_guc_ct { wait_queue_head_t wq; /** @g2h_fence_wq: wait queue used for G2H fencing */ wait_queue_head_t g2h_fence_wq;

• /** @g2h_wq: used to process G2H */
• struct workqueue_struct *g2h_wq; /** @msg: Message buffer */ u32 msg[GUC_CTB_MSG_MAX_LEN]; /** @fast_msg: Message buffer */

-- 2.34.1