The patch below does not apply to the 6.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.10.y git checkout FETCH_HEAD git cherry-pick -x 50aec9665e0babd62b9eee4e613d9a1ef8d2b7de # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024081201-impotent-presoak-2c6d@gregkh' --subject-prefix 'PATCH 6.10.y' HEAD^..

Possible dependencies:

50aec9665e0b ("drm/xe: Use ordered WQ for G2H handler")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 50aec9665e0babd62b9eee4e613d9a1ef8d2b7de Mon Sep 17 00:00:00 2001 From: Matthew Brost matthew.brost@intel.com Date: Sun, 5 May 2024 20:47:58 -0700 Subject: [PATCH] drm/xe: Use ordered WQ for G2H handler

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 Link: https://patchwork.freedesktop.org/patch/msgid/20240506034758.3697397-1-matth...

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c index 8ac819a7061e..0151d29b3c58 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 */