linux-kernel - [PATCH v3 3/4] amd/amdkfd: add WQ_UNBOUND to alloc

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Message-ID: <20251224144708.61167-4-marco.crivellari@suse.com>
Date: Wed, 24 Dec 2025 15:47:07 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Cc: Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian Konig <christian.koenig@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Philip Yang <yangp@....com>
Subject: [PATCH v3 3/4] amd/amdkfd: add WQ_UNBOUND to alloc_workqueue users

This continues the effort to refactor workqueue APIs, which began with
the introduction of new workqueues and a new alloc_workqueue flag in:

   commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
   commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")

The refactoring is going to alter the default behavior of
alloc_workqueue() to be unbound by default.

With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND),
any alloc_workqueue() caller that doesn’t explicitly specify WQ_UNBOUND
must now use WQ_PERCPU. For more details see the Link tag below.

This specific workload has no benefit being per-cpu, so its behavior has
been changed using explicitly WQ_UNBOUND.

Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_process.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index a085faac9fe1..5ecdb338b390 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -690,7 +690,8 @@ void kfd_procfs_del_queue(struct queue *q)
 int kfd_process_create_wq(void)
 {
 	if (!kfd_process_wq)
-		kfd_process_wq = alloc_workqueue("kfd_process_wq", 0, 0);
+		kfd_process_wq = alloc_workqueue("kfd_process_wq", WQ_UNBOUND,
+						 0);
 	if (!kfd_restore_wq)
 		kfd_restore_wq = alloc_ordered_workqueue("kfd_restore_wq",
 							 WQ_FREEZABLE);
-- 
2.52.0