From: Liviu Dudau <liviu.dudau@arm.com>
To: Thomas Zimmermann <tzimmermann@suse.de>
Cc: daniel@ffwll.ch, airlied@linux.ie, alexander.deucher@amd.com,
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Subject: Re: [PATCH v2 04/22] drm: Don't test for IRQ support in VBLANK ioctls
Date: Tue, 22 Jun 2021 16:25:04 +0100 [thread overview]
Message-ID: <20210622152504.2sw6khajwydsoaqa@e110455-lin.cambridge.arm.com> (raw)
In-Reply-To: <20210622141002.11590-5-tzimmermann@suse.de>
Hello,
On Tue, Jun 22, 2021 at 04:09:44PM +0200, Thomas Zimmermann wrote:
> For KMS drivers, replace the IRQ check in VBLANK ioctls with a check for
> vblank support. IRQs might be enabled wthout vblanking being supported.
>
> This change also removes the DRM framework's only dependency on IRQ state
> for non-legacy drivers. For legacy drivers with userspace modesetting,
> the original test remains in drm_wait_vblank_ioctl().
>
> v2:
> * keep the old test for legacy drivers in
> drm_wait_vblank_ioctl() (Daniel)
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
> drivers/gpu/drm/drm_irq.c | 10 +++-------
> drivers/gpu/drm/drm_vblank.c | 13 +++++++++----
> 2 files changed, 12 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index c3bd664ea733..1d7785721323 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -74,10 +74,8 @@
> * only supports devices with a single interrupt on the main device stored in
> * &drm_device.dev and set as the device paramter in drm_dev_alloc().
> *
> - * These IRQ helpers are strictly optional. Drivers which roll their own only
> - * need to set &drm_device.irq_enabled to signal the DRM core that vblank
> - * interrupts are working. Since these helpers don't automatically clean up the
> - * requested interrupt like e.g. devm_request_irq() they're not really
> + * These IRQ helpers are strictly optional. Since these helpers don't automatically
> + * clean up the requested interrupt like e.g. devm_request_irq() they're not really
> * recommended.
> */
>
> @@ -91,9 +89,7 @@
> * and after the installation.
> *
> * This is the simplified helper interface provided for drivers with no special
> - * needs. Drivers which need to install interrupt handlers for multiple
> - * interrupts must instead set &drm_device.irq_enabled to signal the DRM core
> - * that vblank interrupts are available.
> + * needs.
> *
> * @irq must match the interrupt number that would be passed to request_irq(),
> * if called directly instead of using this helper function.
> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> index 3417e1ac7918..a98a4aad5037 100644
> --- a/drivers/gpu/drm/drm_vblank.c
> +++ b/drivers/gpu/drm/drm_vblank.c
> @@ -1748,8 +1748,13 @@ int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
> unsigned int pipe_index;
> unsigned int flags, pipe, high_pipe;
>
> - if (!dev->irq_enabled)
> - return -EOPNOTSUPP;
> + if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> + if (!drm_dev_has_vblank(dev))
> + return -EOPNOTSUPP;
> + } else {
> + if (!dev->irq_enabled)
> + return -EOPNOTSUPP;
> + }
For a system call that is used quite a lot by userspace we have increased the code size
in a noticeable way. Can we not cache it privately?
Best regards,
Liviu
>
> if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
> return -EINVAL;
> @@ -2023,7 +2028,7 @@ int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data,
> if (!drm_core_check_feature(dev, DRIVER_MODESET))
> return -EOPNOTSUPP;
>
> - if (!dev->irq_enabled)
> + if (!drm_dev_has_vblank(dev))
> return -EOPNOTSUPP;
>
> crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id);
> @@ -2082,7 +2087,7 @@ int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data,
> if (!drm_core_check_feature(dev, DRIVER_MODESET))
> return -EOPNOTSUPP;
>
> - if (!dev->irq_enabled)
> + if (!drm_dev_has_vblank(dev))
> return -EOPNOTSUPP;
>
> crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id);
> --
> 2.32.0
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
next prev parent reply other threads:[~2021-06-22 15:25 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-22 14:09 [PATCH v2 00/22] Deprecate struct drm_device.irq_enabled Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 01/22] drm/amdgpu: Track IRQ state in local device state Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 02/22] drm/hibmc: Call drm_irq_uninstall() unconditionally Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 03/22] drm/radeon: Track IRQ state in local device state Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 04/22] drm: Don't test for IRQ support in VBLANK ioctls Thomas Zimmermann
2021-06-22 15:25 ` Liviu Dudau [this message]
2021-06-23 6:43 ` Thomas Zimmermann
2021-06-23 12:15 ` Liviu Dudau
2021-06-22 14:09 ` [PATCH v2 05/22] drm/komeda: Don't set struct drm_device.irq_enabled Thomas Zimmermann
2021-06-22 15:25 ` Liviu Dudau
2021-06-22 14:09 ` [PATCH v2 06/22] drm/malidp: " Thomas Zimmermann
2021-06-22 15:26 ` Liviu Dudau
2021-06-22 14:09 ` [PATCH v2 07/22] drm/exynos: " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 08/22] drm/kirin: " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 09/22] drm/imx: " Thomas Zimmermann
2021-06-23 6:43 ` Laurentiu Palcu
2021-06-22 14:09 ` [PATCH v2 10/22] drm/mediatek: " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 11/22] drm/nouveau: " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 12/22] drm/omapdrm: Track IRQ state in local device state Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 13/22] drm/rockchip: Don't set struct drm_device.irq_enabled Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 14/22] drm/sti: " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 15/22] drm/stm: " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 16/22] drm/sun4i: " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 17/22] drm/tegra: " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 18/22] drm/tidss: Don't use " Thomas Zimmermann
2021-06-22 14:09 ` [PATCH v2 19/22] drm/vc4: Don't set " Thomas Zimmermann
2021-06-22 14:10 ` [PATCH v2 20/22] drm/vmwgfx: " Thomas Zimmermann
2021-06-22 14:10 ` [PATCH v2 21/22] drm/xlnx: " Thomas Zimmermann
2021-06-22 14:10 ` [PATCH v2 22/22] drm/zte: " Thomas Zimmermann
2021-06-22 15:24 ` [PATCH v2 00/22] Deprecate " Daniel Vetter
2021-06-22 16:11 ` Laurent Pinchart
2021-06-22 16:17 ` Laurent Pinchart
2021-06-23 6:46 ` Thomas Zimmermann
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