linux-sunxi.lists.linux.dev archive mirror
 help / color / mirror / Atom feed
From: Liviu Dudau <liviu.dudau@arm.com>
To: Thomas Zimmermann <tzimmermann@suse.de>
Cc: daniel@ffwll.ch, airlied@linux.ie, alexander.deucher@amd.com,
	christian.koenig@amd.com, Xinhui.Pan@amd.com,
	james.qian.wang@arm.com, mihail.atanassov@arm.com,
	brian.starkey@arm.com, maarten.lankhorst@linux.intel.com,
	mripard@kernel.org, inki.dae@samsung.com,
	jy0922.shim@samsung.com, sw0312.kim@samsung.com,
	kyungmin.park@samsung.com, krzysztof.kozlowski@canonical.com,
	xinliang.liu@linaro.org, tiantao6@hisilicon.com,
	john.stultz@linaro.org, kong.kongxinwei@hisilicon.com,
	puck.chen@hisilicon.com, laurentiu.palcu@oss.nxp.com,
	l.stach@pengutronix.de, p.zabel@pengutronix.de,
	shawnguo@kernel.org, s.hauer@pengutronix.de,
	kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
	chunkuang.hu@kernel.org, matthias.bgg@gmail.com,
	bskeggs@redhat.com, tomba@kernel.org, hjc@rock-chips.com,
	heiko@sntech.de, benjamin.gaignard@linaro.org,
	yannick.fertre@foss.st.com, philippe.cornu@foss.st.com,
	mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com,
	wens@csie.org, jernej.skrabec@gmail.com,
	thierry.reding@gmail.com, jonathanh@nvidia.com,
	jyri.sarha@iki.fi, emma@anholt.net,
	linux-graphics-maintainer@vmware.com, zackr@vmware.com,
	hyun.kwon@xilinx.com, laurent.pinchart@ideasonboard.com,
	michal.simek@xilinx.com, amd-gfx@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org,
	linux-mediatek@lists.infradead.org,
	nouveau@lists.freedesktop.org,
	linux-rockchip@lists.infradead.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org
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)_/¯

  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210622152504.2sw6khajwydsoaqa@e110455-lin.cambridge.arm.com \
    --to=liviu.dudau@arm.com \
    --cc=Xinhui.Pan@amd.com \
    --cc=airlied@linux.ie \
    --cc=alexander.deucher@amd.com \
    --cc=alexandre.torgue@foss.st.com \
    --cc=amd-gfx@lists.freedesktop.org \
    --cc=benjamin.gaignard@linaro.org \
    --cc=brian.starkey@arm.com \
    --cc=bskeggs@redhat.com \
    --cc=christian.koenig@amd.com \
    --cc=chunkuang.hu@kernel.org \
    --cc=daniel@ffwll.ch \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=emma@anholt.net \
    --cc=festevam@gmail.com \
    --cc=heiko@sntech.de \
    --cc=hjc@rock-chips.com \
    --cc=hyun.kwon@xilinx.com \
    --cc=inki.dae@samsung.com \
    --cc=james.qian.wang@arm.com \
    --cc=jernej.skrabec@gmail.com \
    --cc=john.stultz@linaro.org \
    --cc=jonathanh@nvidia.com \
    --cc=jy0922.shim@samsung.com \
    --cc=jyri.sarha@iki.fi \
    --cc=kernel@pengutronix.de \
    --cc=kong.kongxinwei@hisilicon.com \
    --cc=krzysztof.kozlowski@canonical.com \
    --cc=kyungmin.park@samsung.com \
    --cc=l.stach@pengutronix.de \
    --cc=laurent.pinchart@ideasonboard.com \
    --cc=laurentiu.palcu@oss.nxp.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-graphics-maintainer@vmware.com \
    --cc=linux-imx@nxp.com \
    --cc=linux-mediatek@lists.infradead.org \
    --cc=linux-rockchip@lists.infradead.org \
    --cc=linux-samsung-soc@vger.kernel.org \
    --cc=linux-stm32@st-md-mailman.stormreply.com \
    --cc=linux-sunxi@lists.linux.dev \
    --cc=linux-tegra@vger.kernel.org \
    --cc=maarten.lankhorst@linux.intel.com \
    --cc=matthias.bgg@gmail.com \
    --cc=mcoquelin.stm32@gmail.com \
    --cc=michal.simek@xilinx.com \
    --cc=mihail.atanassov@arm.com \
    --cc=mripard@kernel.org \
    --cc=nouveau@lists.freedesktop.org \
    --cc=p.zabel@pengutronix.de \
    --cc=philippe.cornu@foss.st.com \
    --cc=puck.chen@hisilicon.com \
    --cc=s.hauer@pengutronix.de \
    --cc=shawnguo@kernel.org \
    --cc=sw0312.kim@samsung.com \
    --cc=thierry.reding@gmail.com \
    --cc=tiantao6@hisilicon.com \
    --cc=tomba@kernel.org \
    --cc=tzimmermann@suse.de \
    --cc=wens@csie.org \
    --cc=xinliang.liu@linaro.org \
    --cc=yannick.fertre@foss.st.com \
    --cc=zackr@vmware.com \
    --subject='Re: [PATCH v2 04/22] drm: Don'\''t test for IRQ support in VBLANK ioctls' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).