From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= Subject: Re: [PATCH 2/6] drm: Add drm_simple_encoder_{init,create}() Date: Fri, 7 Feb 2020 15:36:49 +0100 Message-ID: References: <20200207084135.4524-1-tzimmermann@suse.de> <20200207084135.4524-3-tzimmermann@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20200207084135.4524-3-tzimmermann@suse.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" To: Thomas Zimmermann , airlied@linux.ie, daniel@ffwll.ch, maarten.lankhorst@linux.intel.com, mripard@kernel.org, kraxel@redhat.com, sam@ravnborg.org, alexander.deucher@amd.com, emil.velikov@collabora.com Cc: spice-devel@lists.freedesktop.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org List-Id: virtualization@lists.linuxfoundation.org Den 07.02.2020 09.41, skrev Thomas Zimmermann: > The simple-encoder helpers initialize an encoder with an empty > implementation. This covers the requirements of most of the existing > DRM drivers. A call to drm_simple_encoder_create() allocates and > initializes an encoder instance, a call to drm_simple_encoder_init() > initializes a pre-allocated instance. > > Signed-off-by: Thomas Zimmermann > --- > drivers/gpu/drm/drm_encoder.c | 116 ++++++++++++++++++++++++++++++++++ > include/drm/drm_encoder.h | 10 +++ > 2 files changed, 126 insertions(+) > > diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c > +/** > + * drm_simple_encoder_create - Allocate and initialize an encoder > + * @dev: drm device > + * @encoder_type: user visible type of the encoder > + * @name: printf style format string for the encoder name, or NULL for > + * default name > + * > + * Allocates and initialises an encoder that has no further functionality. The > + * encoder will be released automatically. > + * > + * Returns: > + * The encoder on success, a pointer-encoder error code on failure. > + */ > +struct drm_encoder *drm_simple_encoder_create(struct drm_device *dev, > + int encoder_type, > + const char *name, ...) > +{ > + char *namestr = NULL; > + struct drm_encoder *encoder; > + int ret; > + > + encoder = devm_kzalloc(dev->dev, sizeof(*encoder), GFP_KERNEL); The encoder can outlive the devres if the device is unbound when userspace has open fds, so you can't use devm_ here. Noralf. > + if (!encoder) > + return ERR_PTR(-ENOMEM); > + > + if (name) { > + va_list ap; > + > + va_start(ap, name); > + namestr = kvasprintf(GFP_KERNEL, name, ap); > + va_end(ap); > + if (!namestr) { > + ret = -ENOMEM; > + goto err_devm_kfree; > + } > + } > + > + ret = __drm_encoder_init(dev, encoder, > + &drm_simple_encoder_funcs_destroy, > + encoder_type, namestr); > + if (ret) > + goto err_kfree; > + > + return encoder; > + > +err_kfree: > + if (name) > + kfree(namestr); > +err_devm_kfree: > + devm_kfree(dev->dev, encoder); > + return ERR_PTR(ret); > +} > +EXPORT_SYMBOL(drm_simple_encoder_create); > +