linux-kernel - Re: [PATCH 2/2] accel/ivpu: replace use of system_wq with system_percpu

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Message-ID: <dc2662f4-98b5-4fc8-9ed7-5e4a88168f9a@linux.intel.com>
Date: Fri, 24 Oct 2025 12:48:58 +0200
From: Karol Wachowski <karol.wachowski@...ux.intel.com>
To: Marco Crivellari <marco.crivellari@...e.com>,
 linux-kernel@...r.kernel.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>,
 Michal Hocko <mhocko@...e.com>,
 Maciej Falkowski <maciej.falkowski@...ux.intel.com>,
 Oded Gabbay <ogabbay@...nel.org>
Subject: Re: [PATCH 2/2] accel/ivpu: replace use of system_wq with
 system_percpu_wq

On 10/24/2025 11:52 AM, Marco Crivellari wrote:
> Currently if a user enqueue a work item using schedule_delayed_work() the
> used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
> WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
> schedule_work() that is using system_wq and queue_work(), that makes use
> again of WORK_CPU_UNBOUND.
>
> This lack of consistentcy cannot be addressed without refactoring the API.
>
> system_wq should be the per-cpu workqueue, yet in this name nothing makes
> that clear, so replace system_wq with system_percpu_wq.
>
> The old wq (system_wq) will be kept for a few release cycles.
>
> Suggested-by: Tejun Heo <tj@...nel.org>
> Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>
> ---
>  drivers/accel/ivpu/ivpu_hw_btrs.c | 2 +-
>  drivers/accel/ivpu/ivpu_ipc.c     | 2 +-
>  drivers/accel/ivpu/ivpu_job.c     | 2 +-
>  drivers/accel/ivpu/ivpu_mmu.c     | 2 +-
>  drivers/accel/ivpu/ivpu_pm.c      | 2 +-
>  5 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/accel/ivpu/ivpu_hw_btrs.c b/drivers/accel/ivpu/ivpu_hw_btrs.c
> index afdb3b2aa72a..27a345f3befe 100644
> --- a/drivers/accel/ivpu/ivpu_hw_btrs.c
> +++ b/drivers/accel/ivpu/ivpu_hw_btrs.c
> @@ -673,7 +673,7 @@ bool ivpu_hw_btrs_irq_handler_lnl(struct ivpu_device *vdev, int irq)
>  
>  	if (REG_TEST_FLD(VPU_HW_BTRS_LNL_INTERRUPT_STAT, SURV_ERR, status)) {
>  		ivpu_dbg(vdev, IRQ, "Survivability IRQ\n");
> -		queue_work(system_wq, &vdev->irq_dct_work);
> +		queue_work(system_percpu_wq, &vdev->irq_dct_work);
>  	}
>  
>  	if (REG_TEST_FLD(VPU_HW_BTRS_LNL_INTERRUPT_STAT, FREQ_CHANGE, status)) {
> diff --git a/drivers/accel/ivpu/ivpu_ipc.c b/drivers/accel/ivpu/ivpu_ipc.c
> index 5f00809d448a..1f13bf95b2b3 100644
> --- a/drivers/accel/ivpu/ivpu_ipc.c
> +++ b/drivers/accel/ivpu/ivpu_ipc.c
> @@ -459,7 +459,7 @@ void ivpu_ipc_irq_handler(struct ivpu_device *vdev)
>  		}
>  	}
>  
> -	queue_work(system_wq, &vdev->irq_ipc_work);
> +	queue_work(system_percpu_wq, &vdev->irq_ipc_work);
>  }
>  
>  void ivpu_ipc_irq_work_fn(struct work_struct *work)
> diff --git a/drivers/accel/ivpu/ivpu_job.c b/drivers/accel/ivpu/ivpu_job.c
> index 060f1fc031d3..7a1f78b84b09 100644
> --- a/drivers/accel/ivpu/ivpu_job.c
> +++ b/drivers/accel/ivpu/ivpu_job.c
> @@ -574,7 +574,7 @@ static int ivpu_job_signal_and_destroy(struct ivpu_device *vdev, u32 job_id, u32
>  		 * status and ensure both are handled in the same way
>  		 */
>  		job->file_priv->has_mmu_faults = true;
> -		queue_work(system_wq, &vdev->context_abort_work);
> +		queue_work(system_percpu_wq, &vdev->context_abort_work);
>  		return 0;
>  	}
>  
> diff --git a/drivers/accel/ivpu/ivpu_mmu.c b/drivers/accel/ivpu/ivpu_mmu.c
> index 5ea010568faa..e1baf6b64935 100644
> --- a/drivers/accel/ivpu/ivpu_mmu.c
> +++ b/drivers/accel/ivpu/ivpu_mmu.c
> @@ -970,7 +970,7 @@ void ivpu_mmu_irq_evtq_handler(struct ivpu_device *vdev)
>  		}
>  	}
>  
> -	queue_work(system_wq, &vdev->context_abort_work);
> +	queue_work(system_percpu_wq, &vdev->context_abort_work);
>  }
>  
>  void ivpu_mmu_evtq_dump(struct ivpu_device *vdev)
> diff --git a/drivers/accel/ivpu/ivpu_pm.c b/drivers/accel/ivpu/ivpu_pm.c
> index ffa2ba7cafe2..0cff8f808429 100644
> --- a/drivers/accel/ivpu/ivpu_pm.c
> +++ b/drivers/accel/ivpu/ivpu_pm.c
> @@ -226,7 +226,7 @@ void ivpu_start_job_timeout_detection(struct ivpu_device *vdev)
>  	unsigned long timeout_ms = ivpu_tdr_timeout_ms ? ivpu_tdr_timeout_ms : vdev->timeout.tdr;
>  
>  	/* No-op if already queued */
> -	queue_delayed_work(system_wq, &vdev->pm->job_timeout_work, msecs_to_jiffies(timeout_ms));
> +	queue_delayed_work(system_percpu_wq, &vdev->pm->job_timeout_work, msecs_to_jiffies(timeout_ms));
Thanks for the patch. Please fix the checkpatch warning: 

WARNING: line length of 104 exceeds 100
columns                                                                           
#90: FILE:
drivers/accel/ivpu/ivpu_pm.c:229:                                                                              
+       queue_delayed_work(system_percpu_wq,
&vdev->pm->job_timeout_work, msecs_to_jiffies(timeout_ms));  
>  }
>  
>  void ivpu_stop_job_timeout_detection(struct ivpu_device *vdev)

Also there's a typo "consistentcy" -> "consistency" that can get fixed
with together with that warning.

Tested-by: Karol Wachowski <karol.wachowski@...ux.intel.com>