From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF87FC49EA5 for ; Wed, 23 Jun 2021 12:16:00 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B61FD6100A for ; Wed, 23 Jun 2021 12:16:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B61FD6100A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0C24F6E8C5; Wed, 23 Jun 2021 12:16:00 +0000 (UTC) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by gabe.freedesktop.org (Postfix) with ESMTP id 551936E8C5; Wed, 23 Jun 2021 12:15:58 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 69258ED1; Wed, 23 Jun 2021 05:15:57 -0700 (PDT) Received: from e110455-lin.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2AC093F718; Wed, 23 Jun 2021 05:15:57 -0700 (PDT) Received: by e110455-lin.cambridge.arm.com (Postfix, from userid 1000) id DA9E16837C9; Wed, 23 Jun 2021 13:15:55 +0100 (BST) Date: Wed, 23 Jun 2021 13:15:55 +0100 From: Liviu Dudau To: Thomas Zimmermann Subject: Re: [PATCH v2 04/22] drm: Don't test for IRQ support in VBLANK ioctls Message-ID: <20210623121555.ttos325zjt55dynw@e110455-lin.cambridge.arm.com> References: <20210622141002.11590-1-tzimmermann@suse.de> <20210622141002.11590-5-tzimmermann@suse.de> <20210622152504.2sw6khajwydsoaqa@e110455-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: emma@anholt.net, airlied@linux.ie, nouveau@lists.freedesktop.org, alexandre.torgue@foss.st.com, dri-devel@lists.freedesktop.org, matthias.bgg@gmail.com, thierry.reding@gmail.com, laurent.pinchart@ideasonboard.com, benjamin.gaignard@linaro.org, mihail.atanassov@arm.com, linux-stm32@st-md-mailman.stormreply.com, linux-samsung-soc@vger.kernel.org, jy0922.shim@samsung.com, krzysztof.kozlowski@canonical.com, michal.simek@xilinx.com, jernej.skrabec@gmail.com, jonathanh@nvidia.com, linux-rockchip@lists.infradead.org, kong.kongxinwei@hisilicon.com, james.qian.wang@arm.com, linux-imx@nxp.com, xinliang.liu@linaro.org, linux-graphics-maintainer@vmware.com, linux-sunxi@lists.linux.dev, bskeggs@redhat.com, chunkuang.hu@kernel.org, mcoquelin.stm32@gmail.com, puck.chen@hisilicon.com, s.hauer@pengutronix.de, linux-mediatek@lists.infradead.org, laurentiu.palcu@oss.nxp.com, linux-tegra@vger.kernel.org, wens@csie.org, linux-arm-kernel@lists.infradead.org, amd-gfx@lists.freedesktop.org, tomba@kernel.org, hyun.kwon@xilinx.com, shawnguo@kernel.org, yannick.fertre@foss.st.com, Xinhui.Pan@amd.com, sw0312.kim@samsung.com, hjc@rock-chips.com, kyungmin.park@samsung.com, philippe.cornu@foss.st.com, kernel@pengutronix.de, alexander.deucher@amd.com, tiantao6@hisilicon.com, jyri.sarha@iki.fi, christian.koenig@amd.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi Thomas, On Wed, Jun 23, 2021 at 08:43:07AM +0200, Thomas Zimmermann wrote: > Hi Liviu > > Am 22.06.21 um 17:25 schrieb Liviu Dudau: > > 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 > > > --- > > > 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? > > I'm not quite sure that I understand your concern. The additionally called > functions are trivial one-liners; probably inlined anyway. They are inlined. However we replace the pointer dereference (which can be calculated at compile time as offset from a base pointer) with the code in drm_core_check_all_features() that does 3 pointer dereferences, masking and logical AND before checking for matching value. > > However, irq_enabled is only relevant for legacy drivers and will eventually > disappear behind CONFIG_DRM_LEGACY. We can rewrite the test like this: I get the point that irq_enabled is legacy. However the IOCTL call is not and usually is used in time critical code to wait for vblank before starting the old buffers for a new frame. At 60Hz that's probably less of a concern, but at 120Hz refresh rate and reduced vblank time your time slice allocation for new work matters. Best regards, Liviu > > ifdef CONFIG_DRM_LEGACY > if (unlikely(check_feature(dev, DRIVER_LEGACY))) { > if (!irq_enabled) > return; > } else > #endif > { > if (!has_vblank_support(dev)) > return; > } > > As CONFIG_DRM_LEGACY is most likely disabled on concurrent systems, we'd get > a single test for the modern drivers. If DRM_LEGACYis on, the compiler at > least knows that the else branch is preferred. > > Best regards > Thomas > > -- > Thomas Zimmermann > Graphics Driver Developer > SUSE Software Solutions Germany GmbH > Maxfeldstr. 5, 90409 Nürnberg, Germany > (HRB 36809, AG Nürnberg) > Geschäftsführer: Felix Imendörffer > -- ==================== | I would like to | | fix the world, | | but they're not | | giving me the | \ source code! / --------------- ¯\_(ツ)_/¯ From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9ABAC48BC2 for ; Wed, 23 Jun 2021 12:15:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B7E2F6100A for ; Wed, 23 Jun 2021 12:15:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230130AbhFWMSP (ORCPT ); Wed, 23 Jun 2021 08:18:15 -0400 Received: from foss.arm.com ([217.140.110.172]:34374 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230019AbhFWMSP (ORCPT ); Wed, 23 Jun 2021 08:18:15 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 69258ED1; Wed, 23 Jun 2021 05:15:57 -0700 (PDT) Received: from e110455-lin.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2AC093F718; Wed, 23 Jun 2021 05:15:57 -0700 (PDT) Received: by e110455-lin.cambridge.arm.com (Postfix, from userid 1000) id DA9E16837C9; Wed, 23 Jun 2021 13:15:55 +0100 (BST) Date: Wed, 23 Jun 2021 13:15:55 +0100 From: Liviu Dudau To: Thomas Zimmermann Cc: emma@anholt.net, airlied@linux.ie, nouveau@lists.freedesktop.org, alexandre.torgue@foss.st.com, dri-devel@lists.freedesktop.org, michal.simek@xilinx.com, linux-tegra@vger.kernel.org, thierry.reding@gmail.com, laurent.pinchart@ideasonboard.com, benjamin.gaignard@linaro.org, mihail.atanassov@arm.com, linux-stm32@st-md-mailman.stormreply.com, linux-samsung-soc@vger.kernel.org, jy0922.shim@samsung.com, krzysztof.kozlowski@canonical.com, linux-rockchip@lists.infradead.org, linux-mediatek@lists.infradead.org, wens@csie.org, jernej.skrabec@gmail.com, jonathanh@nvidia.com, xinliang.liu@linaro.org, kong.kongxinwei@hisilicon.com, james.qian.wang@arm.com, linux-imx@nxp.com, linux-graphics-maintainer@vmware.com, linux-sunxi@lists.linux.dev, bskeggs@redhat.com, chunkuang.hu@kernel.org, puck.chen@hisilicon.com, s.hauer@pengutronix.de, laurentiu.palcu@oss.nxp.com, matthias.bgg@gmail.com, kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org, mcoquelin.stm32@gmail.com, amd-gfx@lists.freedesktop.org, hyun.kwon@xilinx.com, tomba@kernel.org, jyri.sarha@iki.fi, yannick.fertre@foss.st.com, Xinhui.Pan@amd.com, sw0312.kim@samsung.com, hjc@rock-chips.com, christian.koenig@amd.com, kyungmin.park@samsung.com, philippe.cornu@foss.st.com, alexander.deucher@amd.com, tiantao6@hisilicon.com, shawnguo@kernel.org Subject: Re: [PATCH v2 04/22] drm: Don't test for IRQ support in VBLANK ioctls Message-ID: <20210623121555.ttos325zjt55dynw@e110455-lin.cambridge.arm.com> References: <20210622141002.11590-1-tzimmermann@suse.de> <20210622141002.11590-5-tzimmermann@suse.de> <20210622152504.2sw6khajwydsoaqa@e110455-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Hi Thomas, On Wed, Jun 23, 2021 at 08:43:07AM +0200, Thomas Zimmermann wrote: > Hi Liviu > > Am 22.06.21 um 17:25 schrieb Liviu Dudau: > > 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 > > > --- > > > 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? > > I'm not quite sure that I understand your concern. The additionally called > functions are trivial one-liners; probably inlined anyway. They are inlined. However we replace the pointer dereference (which can be calculated at compile time as offset from a base pointer) with the code in drm_core_check_all_features() that does 3 pointer dereferences, masking and logical AND before checking for matching value. > > However, irq_enabled is only relevant for legacy drivers and will eventually > disappear behind CONFIG_DRM_LEGACY. We can rewrite the test like this: I get the point that irq_enabled is legacy. However the IOCTL call is not and usually is used in time critical code to wait for vblank before starting the old buffers for a new frame. At 60Hz that's probably less of a concern, but at 120Hz refresh rate and reduced vblank time your time slice allocation for new work matters. Best regards, Liviu > > ifdef CONFIG_DRM_LEGACY > if (unlikely(check_feature(dev, DRIVER_LEGACY))) { > if (!irq_enabled) > return; > } else > #endif > { > if (!has_vblank_support(dev)) > return; > } > > As CONFIG_DRM_LEGACY is most likely disabled on concurrent systems, we'd get > a single test for the modern drivers. If DRM_LEGACYis on, the compiler at > least knows that the else branch is preferred. > > Best regards > Thomas > > -- > Thomas Zimmermann > Graphics Driver Developer > SUSE Software Solutions Germany GmbH > Maxfeldstr. 5, 90409 Nürnberg, Germany > (HRB 36809, AG Nürnberg) > Geschäftsführer: Felix Imendörffer > -- ==================== | I would like to | | fix the world, | | but they're not | | giving me the | \ source code! / --------------- ¯\_(ツ)_/¯ From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AEF7DC49EA6 for ; Wed, 23 Jun 2021 12:16:00 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7EAFF6100A for ; Wed, 23 Jun 2021 12:16:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7EAFF6100A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=amd-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 30D286E8C7; Wed, 23 Jun 2021 12:16:00 +0000 (UTC) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by gabe.freedesktop.org (Postfix) with ESMTP id 551936E8C5; Wed, 23 Jun 2021 12:15:58 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 69258ED1; Wed, 23 Jun 2021 05:15:57 -0700 (PDT) Received: from e110455-lin.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2AC093F718; Wed, 23 Jun 2021 05:15:57 -0700 (PDT) Received: by e110455-lin.cambridge.arm.com (Postfix, from userid 1000) id DA9E16837C9; Wed, 23 Jun 2021 13:15:55 +0100 (BST) Date: Wed, 23 Jun 2021 13:15:55 +0100 From: Liviu Dudau To: Thomas Zimmermann Subject: Re: [PATCH v2 04/22] drm: Don't test for IRQ support in VBLANK ioctls Message-ID: <20210623121555.ttos325zjt55dynw@e110455-lin.cambridge.arm.com> References: <20210622141002.11590-1-tzimmermann@suse.de> <20210622141002.11590-5-tzimmermann@suse.de> <20210622152504.2sw6khajwydsoaqa@e110455-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: emma@anholt.net, airlied@linux.ie, nouveau@lists.freedesktop.org, alexandre.torgue@foss.st.com, dri-devel@lists.freedesktop.org, matthias.bgg@gmail.com, thierry.reding@gmail.com, laurent.pinchart@ideasonboard.com, benjamin.gaignard@linaro.org, mihail.atanassov@arm.com, linux-stm32@st-md-mailman.stormreply.com, linux-samsung-soc@vger.kernel.org, jy0922.shim@samsung.com, krzysztof.kozlowski@canonical.com, michal.simek@xilinx.com, jernej.skrabec@gmail.com, jonathanh@nvidia.com, linux-rockchip@lists.infradead.org, kong.kongxinwei@hisilicon.com, james.qian.wang@arm.com, linux-imx@nxp.com, xinliang.liu@linaro.org, linux-graphics-maintainer@vmware.com, linux-sunxi@lists.linux.dev, bskeggs@redhat.com, chunkuang.hu@kernel.org, mcoquelin.stm32@gmail.com, puck.chen@hisilicon.com, s.hauer@pengutronix.de, linux-mediatek@lists.infradead.org, laurentiu.palcu@oss.nxp.com, linux-tegra@vger.kernel.org, wens@csie.org, linux-arm-kernel@lists.infradead.org, amd-gfx@lists.freedesktop.org, tomba@kernel.org, hyun.kwon@xilinx.com, shawnguo@kernel.org, yannick.fertre@foss.st.com, Xinhui.Pan@amd.com, sw0312.kim@samsung.com, hjc@rock-chips.com, kyungmin.park@samsung.com, philippe.cornu@foss.st.com, kernel@pengutronix.de, alexander.deucher@amd.com, tiantao6@hisilicon.com, jyri.sarha@iki.fi, christian.koenig@amd.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" SGkgVGhvbWFzLAoKT24gV2VkLCBKdW4gMjMsIDIwMjEgYXQgMDg6NDM6MDdBTSArMDIwMCwgVGhv bWFzIFppbW1lcm1hbm4gd3JvdGU6Cj4gSGkgTGl2aXUKPiAKPiBBbSAyMi4wNi4yMSB1bSAxNzoy NSBzY2hyaWViIExpdml1IER1ZGF1Ogo+ID4gSGVsbG8sCj4gPiAKPiA+IE9uIFR1ZSwgSnVuIDIy LCAyMDIxIGF0IDA0OjA5OjQ0UE0gKzAyMDAsIFRob21hcyBaaW1tZXJtYW5uIHdyb3RlOgo+ID4g PiBGb3IgS01TIGRyaXZlcnMsIHJlcGxhY2UgdGhlIElSUSBjaGVjayBpbiBWQkxBTksgaW9jdGxz IHdpdGggYSBjaGVjayBmb3IKPiA+ID4gdmJsYW5rIHN1cHBvcnQuIElSUXMgbWlnaHQgYmUgZW5h 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linux-mediatek@lists.infradead.org, wens@csie.org, jernej.skrabec@gmail.com, jonathanh@nvidia.com, xinliang.liu@linaro.org, kong.kongxinwei@hisilicon.com, james.qian.wang@arm.com, linux-imx@nxp.com, linux-graphics-maintainer@vmware.com, linux-sunxi@lists.linux.dev, bskeggs@redhat.com, chunkuang.hu@kernel.org, puck.chen@hisilicon.com, s.hauer@pengutronix.de, laurentiu.palcu@oss.nxp.com, matthias.bgg@gmail.com, kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org, mcoquelin.stm32@gmail.com, amd-gfx@lists.freedesktop.org, hyun.kwon@xilinx.com, tomba@kernel.org, jyri.sarha@iki.fi, yannick.fertre@foss.st.com, Xinhui.Pan@amd.com, sw0312.kim@samsung.com, hjc@rock-chips.com, christian.koenig@amd.com, kyungmin.park@samsung.com, philippe.cornu@foss.st.com, alexander.deucher@amd.com, tiantao6@hisilicon.com, shawnguo@kernel.org Subject: Re: [PATCH v2 04/22] drm: Don't test for IRQ support in VBLANK ioctls Message-ID: <20210623121555.ttos325zjt55dynw@e110455-lin.cambridge.arm.com> References: <20210622141002.11590-1-tzimmermann@suse.de> <20210622141002.11590-5-tzimmermann@suse.de> <20210622152504.2sw6khajwydsoaqa@e110455-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210623_051604_409435_97FBC950 X-CRM114-Status: GOOD ( 40.32 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org SGkgVGhvbWFzLAoKT24gV2VkLCBKdW4gMjMsIDIwMjEgYXQgMDg6NDM6MDdBTSArMDIwMCwgVGhv bWFzIFppbW1lcm1hbm4gd3JvdGU6Cj4gSGkgTGl2aXUKPiAKPiBBbSAyMi4wNi4yMSB1bSAxNzoy NSBzY2hyaWViIExpdml1IER1ZGF1Ogo+ID4gSGVsbG8sCj4gPiAKPiA+IE9uIFR1ZSwgSnVuIDIy 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philippe.cornu@foss.st.com, alexander.deucher@amd.com, tiantao6@hisilicon.com, shawnguo@kernel.org Subject: Re: [PATCH v2 04/22] drm: Don't test for IRQ support in VBLANK ioctls Message-ID: <20210623121555.ttos325zjt55dynw@e110455-lin.cambridge.arm.com> References: <20210622141002.11590-1-tzimmermann@suse.de> <20210622141002.11590-5-tzimmermann@suse.de> <20210622152504.2sw6khajwydsoaqa@e110455-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210623_051604_409435_97FBC950 X-CRM114-Status: GOOD ( 40.32 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: 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(Postfix, from userid 1000) id DA9E16837C9; Wed, 23 Jun 2021 13:15:55 +0100 (BST) Date: Wed, 23 Jun 2021 13:15:55 +0100 From: Liviu Dudau To: Thomas Zimmermann Message-ID: <20210623121555.ttos325zjt55dynw@e110455-lin.cambridge.arm.com> References: <20210622141002.11590-1-tzimmermann@suse.de> <20210622141002.11590-5-tzimmermann@suse.de> <20210622152504.2sw6khajwydsoaqa@e110455-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Mailman-Approved-At: Sun, 27 Jun 2021 03:34:44 +0000 Subject: Re: [Nouveau] [PATCH v2 04/22] drm: Don't test for IRQ support in VBLANK ioctls X-BeenThere: nouveau@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Nouveau development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: emma@anholt.net, airlied@linux.ie, nouveau@lists.freedesktop.org, alexandre.torgue@foss.st.com, dri-devel@lists.freedesktop.org, matthias.bgg@gmail.com, thierry.reding@gmail.com, laurent.pinchart@ideasonboard.com, benjamin.gaignard@linaro.org, mihail.atanassov@arm.com, linux-stm32@st-md-mailman.stormreply.com, linux-samsung-soc@vger.kernel.org, jy0922.shim@samsung.com, krzysztof.kozlowski@canonical.com, michal.simek@xilinx.com, jernej.skrabec@gmail.com, linux-rockchip@lists.infradead.org, kong.kongxinwei@hisilicon.com, james.qian.wang@arm.com, linux-imx@nxp.com, xinliang.liu@linaro.org, linux-graphics-maintainer@vmware.com, linux-sunxi@lists.linux.dev, bskeggs@redhat.com, chunkuang.hu@kernel.org, mcoquelin.stm32@gmail.com, puck.chen@hisilicon.com, s.hauer@pengutronix.de, linux-mediatek@lists.infradead.org, laurentiu.palcu@oss.nxp.com, linux-tegra@vger.kernel.org, wens@csie.org, linux-arm-kernel@lists.infradead.org, amd-gfx@lists.freedesktop.org, tomba@kernel.org, hyun.kwon@xilinx.com, shawnguo@kernel.org, yannick.fertre@foss.st.com, Xinhui.Pan@amd.com, sw0312.kim@samsung.com, hjc@rock-chips.com, kyungmin.park@samsung.com, philippe.cornu@foss.st.com, kernel@pengutronix.de, alexander.deucher@amd.com, tiantao6@hisilicon.com, jyri.sarha@iki.fi, christian.koenig@amd.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: nouveau-bounces@lists.freedesktop.org Sender: "Nouveau" SGkgVGhvbWFzLAoKT24gV2VkLCBKdW4gMjMsIDIwMjEgYXQgMDg6NDM6MDdBTSArMDIwMCwgVGhv bWFzIFppbW1lcm1hbm4gd3JvdGU6Cj4gSGkgTGl2aXUKPiAKPiBBbSAyMi4wNi4yMSB1bSAxNzoy NSBzY2hyaWViIExpdml1IER1ZGF1Ogo+ID4gSGVsbG8sCj4gPiAKPiA+IE9uIFR1ZSwgSnVuIDIy LCAyMDIxIGF0IDA0OjA5OjQ0UE0gKzAyMDAsIFRob21hcyBaaW1tZXJtYW5uIHdyb3RlOgo+ID4g PiBGb3IgS01TIGRyaXZlcnMsIHJlcGxhY2UgdGhlIElSUSBjaGVjayBpbiBWQkxBTksgaW9jdGxz IHdpdGggYSBjaGVjayBmb3IKPiA+ID4gdmJsYW5rIHN1cHBvcnQuIElSUXMgbWlnaHQgYmUgZW5h YmxlZCB3dGhvdXQgdmJsYW5raW5nIGJlaW5nIHN1cHBvcnRlZC4KPiA+ID4gCj4gPiA+IFRoaXMg Y2hhbmdlIGFsc28gcmVtb3ZlcyB0aGUgRFJNIGZyYW1ld29yaydzIG9ubHkgZGVwZW5kZW5jeSBv biBJUlEgc3RhdGUKPiA+ID4gZm9yIG5vbi1sZWdhY3kgZHJpdmVycy4gRm9yIGxlZ2FjeSBkcml2 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