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Message-ID: <20251001130237.3bc791a3@fedora>
Date: Wed, 1 Oct 2025 13:02:37 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, Steven
Price <steven.price@....com>, kernel@...labora.com, Rob Herring
<robh@...nel.org>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann
<tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter
<simona@...ll.ch>
Subject: Re: [PATCH v4 07/10] drm/panfrost: Make re-enabling job interrupts
at device reset optional
On Wed, 1 Oct 2025 03:20:28 +0100
Adrián Larumbe <adrian.larumbe@...labora.com> wrote:
> Rather than remasking interrupts after a device reset in the main reset
> path, allow selecting whether to do this with an additional bool parameter.
>
> To this end, split reenabling job interrupts into two functions, one that
> clears the interrupts and another one which unmasks them conditionally.
>
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> ---
> drivers/gpu/drm/panfrost/panfrost_device.c | 9 ++++++---
> drivers/gpu/drm/panfrost/panfrost_device.h | 2 +-
> drivers/gpu/drm/panfrost/panfrost_job.c | 17 ++++++++---------
> drivers/gpu/drm/panfrost/panfrost_job.h | 1 +
> 4 files changed, 16 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
> index 733b728ec75f..f1d811a6de6c 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> @@ -400,13 +400,16 @@ bool panfrost_exception_needs_reset(const struct panfrost_device *pfdev,
> return false;
> }
>
> -void panfrost_device_reset(struct panfrost_device *pfdev)
> +void panfrost_device_reset(struct panfrost_device *pfdev, bool enable_job_int)
> {
> panfrost_gpu_soft_reset(pfdev);
>
> panfrost_gpu_power_on(pfdev);
> panfrost_mmu_reset(pfdev);
> - panfrost_job_enable_interrupts(pfdev);
> +
> + panfrost_job_reset_interrupts(pfdev);
> + if (enable_job_int)
> + panfrost_job_enable_interrupts(pfdev);
> }
>
> static int panfrost_device_runtime_resume(struct device *dev)
> @@ -430,7 +433,7 @@ static int panfrost_device_runtime_resume(struct device *dev)
> }
> }
>
> - panfrost_device_reset(pfdev);
> + panfrost_device_reset(pfdev, true);
> panfrost_devfreq_resume(pfdev);
>
> return 0;
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index ac7147ed806b..45d77cda8b89 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -250,7 +250,7 @@ int panfrost_unstable_ioctl_check(void);
>
> int panfrost_device_init(struct panfrost_device *pfdev);
> void panfrost_device_fini(struct panfrost_device *pfdev);
> -void panfrost_device_reset(struct panfrost_device *pfdev);
> +void panfrost_device_reset(struct panfrost_device *pfdev, bool enable_job_int);
>
> extern const struct dev_pm_ops panfrost_pm_ops;
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index 54764ce91dea..3ae984f6290f 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -426,11 +426,14 @@ static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
> return fence;
> }
>
> +void panfrost_job_reset_interrupts(struct panfrost_device *pfdev)
> +{
> + job_write(pfdev, JOB_INT_CLEAR, ALL_JS_INT_MASK);
> +}
> +
> void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
> {
> clear_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended);
> -
> - job_write(pfdev, JOB_INT_CLEAR, ALL_JS_INT_MASK);
> job_write(pfdev, JOB_INT_MASK, ALL_JS_INT_MASK);
> }
>
> @@ -723,12 +726,7 @@ panfrost_reset(struct panfrost_device *pfdev,
> spin_unlock(&pfdev->js->job_lock);
>
> /* Proceed with reset now. */
> - panfrost_device_reset(pfdev);
> -
> - /* panfrost_device_reset() unmasks job interrupts, but we want to
> - * keep them masked a bit longer.
> - */
> - job_write(pfdev, JOB_INT_MASK, 0);
> + panfrost_device_reset(pfdev, false);
>
> /* GPU has been reset, we can clear the reset pending bit. */
> atomic_set(&pfdev->reset.pending, 0);
> @@ -750,7 +748,7 @@ panfrost_reset(struct panfrost_device *pfdev,
> drm_sched_start(&pfdev->js->queue[i].sched, 0);
>
> /* Re-enable job interrupts now that everything has been restarted. */
> - job_write(pfdev, JOB_INT_MASK, ALL_JS_INT_MASK);
> + panfrost_job_enable_interrupts(pfdev);
>
> dma_fence_end_signalling(cookie);
> }
> @@ -901,6 +899,7 @@ int panfrost_job_init(struct panfrost_device *pfdev)
> }
> }
>
> + panfrost_job_reset_interrupts(pfdev);
> panfrost_job_enable_interrupts(pfdev);
>
> return 0;
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.h b/drivers/gpu/drm/panfrost/panfrost_job.h
> index 5a30ff1503c6..30eda74e3c34 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.h
> @@ -67,6 +67,7 @@ void panfrost_job_close(struct drm_file *file);
> int panfrost_job_get_slot(struct panfrost_job *job);
> int panfrost_job_push(struct panfrost_job *job);
> void panfrost_job_put(struct panfrost_job *job);
> +void panfrost_job_reset_interrupts(struct panfrost_device *pfdev);
> void panfrost_job_enable_interrupts(struct panfrost_device *pfdev);
> void panfrost_job_suspend_irq(struct panfrost_device *pfdev);
> int panfrost_job_is_idle(struct panfrost_device *pfdev);
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