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bh=VOGYRaeBdiQqBh4ZC4X/70JOvvT4r9gZtTU+5Lgek70=; b=ehx0T4wWsKP3UTiv5OnacP+zSZAezlp1JEt/46+V5UqKMlp+ouocCbZV5wCn2W9YCoJRcF qefA3JBaj8R7n1FE7JzB0IIvb3Ekbv+Z8UqHP4X+XU31hJL8n7B0cXTKmuu0PNrqlRXoGP 8RL9PhPc5mJ0Cvrw+ve/C6zQhnvzqwCUvJoIkDfR3adv6ndp98jz2e9GJ7lF2MI/NzYgxs g9PurXTnmIr2a0SLxxYQ8rcMWsoPeJ4EYSMM7fnEhaUgxsJXvdLfhzTMMHaZjqRLzSGq2u Mbmbt2ZXDKRPKcTRx0WRfw2Yp1dZRqn9lUHT1kcjsT8aVxDes9fcSnnmxW6cUQ== Message-ID: Date: Tue, 15 Apr 2025 14:18:01 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 06/16] drm/vkms: Allow to configure CRTC writeback support via configfs To: =?UTF-8?B?Sm9zw6kgRXhww7NzaXRv?= Cc: hamohammed.sa@gmail.com, simona@ffwll.ch, melissa.srw@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20250407081425.6420-1-jose.exposito89@gmail.com> <20250407081425.6420-7-jose.exposito89@gmail.com> Content-Language: en-US From: Louis Chauvet Autocrypt: addr=louis.chauvet@bootlin.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddvvdefgeejucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefkffggfgfuvfevfhfhjggtgfesthekredttddvjeenucfhrhhomhepnfhouhhishcuvehhrghuvhgvthcuoehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeekieevtdefgedtkeehteehtddttdefhffhgeejleejjeeluddvhfdugedvkeehveenucffohhmrghinhepsghoohhtlhhinhdrtghomhenucfkphepledtrdekledrudeifedruddvjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeeltddrkeelrdduieefrdduvdejpdhhvghloheplgduledvrdduieekrddtrddvtdgnpdhmrghilhhfrhhomheplhhouhhishdrtghhrghuvhgvthessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepuddtpdhrtghpthhtohepjhhoshgvrdgvgihpohhsihhtohekleesghhmrghilhdrtghomhdprhgtphhtthhopehhrghmohhhrghmmhgvugdrshgrsehgmhgrihhlrdgtohhmpdhrtghpthhtohepshhimhhonhgrsehffhiflhhlrdgthhdprhgtphhtthhopehmvghlihhsshgrrdhsrhifsehgmhgrihhlrdgtohhmpdhrtghpthhtohepm hgrrghrthgvnhdrlhgrnhhkhhhorhhstheslhhinhhugidrihhnthgvlhdrtghomhdprhgtphhtthhopehmrhhiphgrrhgusehkvghrnhgvlhdrohhrghdprhgtphhtthhopehtiihimhhmvghrmhgrnhhnsehsuhhsvgdruggvpdhrtghpthhtoheprghirhhlihgvugesghhmrghilhdrtghomh X-GND-Sasl: louis.chauvet@bootlin.com Le 07/04/2025 à 10:14, José Expósito a écrit : > From: Louis Chauvet > > When a CRTC is created, add a `writeback` file to allow to enable or > disable writeback connector support Reviewed-by: Louis Chauvet > Signed-off-by: Louis Chauvet > Co-developed-by: José Expósito > Signed-off-by: José Expósito > --- > Documentation/gpu/vkms.rst | 4 +++ > drivers/gpu/drm/vkms/vkms_configfs.c | 42 ++++++++++++++++++++++++++++ > 2 files changed, 46 insertions(+) > > diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst > index e0699603ef53..abe7a0f5a4ab 100644 > --- a/Documentation/gpu/vkms.rst > +++ b/Documentation/gpu/vkms.rst > @@ -94,6 +94,10 @@ Continue by creating one or more CRTCs:: > > sudo mkdir /config/vkms/my-vkms/crtcs/crtc0 > > +CRTCs have 1 configurable attribute: > + > +- writeback: Enable or disable writeback connector support by writing 1 or 0 > + > Once you are done configuring the VKMS instance, enable it:: > > echo "1" | sudo tee /config/vkms/my-vkms/enabled > diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c > index 62a82366791d..e9f445043268 100644 > --- a/drivers/gpu/drm/vkms/vkms_configfs.c > +++ b/drivers/gpu/drm/vkms/vkms_configfs.c > @@ -74,6 +74,47 @@ struct vkms_configfs_crtc { > #define crtc_item_to_vkms_configfs_crtc(item) \ > container_of(to_config_group((item)), struct vkms_configfs_crtc, group) > > +static ssize_t crtc_writeback_show(struct config_item *item, char *page) > +{ > + struct vkms_configfs_crtc *crtc; > + bool writeback; > + > + crtc = crtc_item_to_vkms_configfs_crtc(item); > + > + scoped_guard(mutex, &crtc->dev->lock) > + writeback = vkms_config_crtc_get_writeback(crtc->config); > + > + return sprintf(page, "%d\n", writeback); > +} > + > +static ssize_t crtc_writeback_store(struct config_item *item, const char *page, > + size_t count) > +{ > + struct vkms_configfs_crtc *crtc; > + bool writeback; > + > + crtc = crtc_item_to_vkms_configfs_crtc(item); > + > + if (kstrtobool(page, &writeback)) > + return -EINVAL; > + > + scoped_guard(mutex, &crtc->dev->lock) { > + if (crtc->dev->enabled) > + return -EBUSY; > + > + vkms_config_crtc_set_writeback(crtc->config, writeback); > + } > + > + return (ssize_t)count; > +} > + > +CONFIGFS_ATTR(crtc_, writeback); > + > +static struct configfs_attribute *crtc_item_attrs[] = { > + &crtc_attr_writeback, > + NULL, > +}; > + > static void crtc_release(struct config_item *item) > { > struct vkms_configfs_crtc *crtc; > @@ -93,6 +134,7 @@ static struct configfs_item_operations crtc_item_operations = { > }; > > static const struct config_item_type crtc_item_type = { > + .ct_attrs = crtc_item_attrs, > .ct_item_ops = &crtc_item_operations, > .ct_owner = THIS_MODULE, > }; -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com