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![Maxime Ripard](/assets/img/avatar_default.png)
The DRM-managed function to register an encoder is drmm_encoder_alloc() and its variants, which will allocate the underlying structure and initialisation the encoder. However, we might want to separate the structure creation and the encoder initialisation, for example if the structure is shared across multiple DRM entities, for example an encoder and a connector. Let's create an helper to only initialise an encoder that would be passed as an argument. Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20220711173939.1132294-4-maxime@cerno.tech
360 lines
11 KiB
C
360 lines
11 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <linux/export.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_device.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_print.h>
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#include "drm_crtc_internal.h"
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/**
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* DOC: overview
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*
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* Encoders represent the connecting element between the CRTC (as the overall
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* pixel pipeline, represented by &struct drm_crtc) and the connectors (as the
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* generic sink entity, represented by &struct drm_connector). An encoder takes
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* pixel data from a CRTC and converts it to a format suitable for any attached
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* connector. Encoders are objects exposed to userspace, originally to allow
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* userspace to infer cloning and connector/CRTC restrictions. Unfortunately
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* almost all drivers get this wrong, making the uabi pretty much useless. On
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* top of that the exposed restrictions are too simple for today's hardware, and
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* the recommended way to infer restrictions is by using the
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* DRM_MODE_ATOMIC_TEST_ONLY flag for the atomic IOCTL.
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*
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* Otherwise encoders aren't used in the uapi at all (any modeset request from
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* userspace directly connects a connector with a CRTC), drivers are therefore
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* free to use them however they wish. Modeset helper libraries make strong use
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* of encoders to facilitate code sharing. But for more complex settings it is
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* usually better to move shared code into a separate &drm_bridge. Compared to
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* encoders, bridges also have the benefit of being purely an internal
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* abstraction since they are not exposed to userspace at all.
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*
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* Encoders are initialized with drm_encoder_init() and cleaned up using
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* drm_encoder_cleanup().
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*/
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static const struct drm_prop_enum_list drm_encoder_enum_list[] = {
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{ DRM_MODE_ENCODER_NONE, "None" },
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{ DRM_MODE_ENCODER_DAC, "DAC" },
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{ DRM_MODE_ENCODER_TMDS, "TMDS" },
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{ DRM_MODE_ENCODER_LVDS, "LVDS" },
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{ DRM_MODE_ENCODER_TVDAC, "TV" },
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{ DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
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{ DRM_MODE_ENCODER_DSI, "DSI" },
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{ DRM_MODE_ENCODER_DPMST, "DP MST" },
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{ DRM_MODE_ENCODER_DPI, "DPI" },
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};
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int drm_encoder_register_all(struct drm_device *dev)
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{
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struct drm_encoder *encoder;
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int ret = 0;
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drm_for_each_encoder(encoder, dev) {
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if (encoder->funcs && encoder->funcs->late_register)
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ret = encoder->funcs->late_register(encoder);
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if (ret)
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return ret;
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}
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return 0;
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}
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void drm_encoder_unregister_all(struct drm_device *dev)
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{
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struct drm_encoder *encoder;
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drm_for_each_encoder(encoder, dev) {
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if (encoder->funcs && encoder->funcs->early_unregister)
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encoder->funcs->early_unregister(encoder);
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}
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}
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__printf(5, 0)
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static int __drm_encoder_init(struct drm_device *dev,
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struct drm_encoder *encoder,
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const struct drm_encoder_funcs *funcs,
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int encoder_type, const char *name, va_list ap)
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{
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int ret;
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/* encoder index is used with 32bit bitmasks */
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if (WARN_ON(dev->mode_config.num_encoder >= 32))
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return -EINVAL;
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ret = drm_mode_object_add(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER);
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if (ret)
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return ret;
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encoder->dev = dev;
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encoder->encoder_type = encoder_type;
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encoder->funcs = funcs;
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if (name) {
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encoder->name = kvasprintf(GFP_KERNEL, name, ap);
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} else {
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encoder->name = kasprintf(GFP_KERNEL, "%s-%d",
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drm_encoder_enum_list[encoder_type].name,
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encoder->base.id);
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}
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if (!encoder->name) {
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ret = -ENOMEM;
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goto out_put;
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}
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INIT_LIST_HEAD(&encoder->bridge_chain);
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list_add_tail(&encoder->head, &dev->mode_config.encoder_list);
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encoder->index = dev->mode_config.num_encoder++;
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out_put:
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if (ret)
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drm_mode_object_unregister(dev, &encoder->base);
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return ret;
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}
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/**
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* drm_encoder_init - Init a preallocated encoder
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* @dev: drm device
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* @encoder: the encoder to init
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* @funcs: callbacks for this encoder
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* @encoder_type: user visible type of the encoder
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* @name: printf style format string for the encoder name, or NULL for default name
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*
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* Initializes a preallocated encoder. Encoder should be subclassed as part of
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* driver encoder objects. At driver unload time the driver's
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* &drm_encoder_funcs.destroy hook should call drm_encoder_cleanup() and kfree()
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* the encoder structure. The encoder structure should not be allocated with
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* devm_kzalloc().
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*
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* Note: consider using drmm_encoder_alloc() or drmm_encoder_init()
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* instead of drm_encoder_init() to let the DRM managed resource
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* infrastructure take care of cleanup and deallocation.
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*
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* Returns:
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* Zero on success, error code on failure.
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*/
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int drm_encoder_init(struct drm_device *dev,
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struct drm_encoder *encoder,
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const struct drm_encoder_funcs *funcs,
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int encoder_type, const char *name, ...)
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{
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va_list ap;
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int ret;
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WARN_ON(!funcs->destroy);
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va_start(ap, name);
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ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
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va_end(ap);
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return ret;
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}
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EXPORT_SYMBOL(drm_encoder_init);
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/**
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* drm_encoder_cleanup - cleans up an initialised encoder
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* @encoder: encoder to cleanup
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*
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* Cleans up the encoder but doesn't free the object.
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*/
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void drm_encoder_cleanup(struct drm_encoder *encoder)
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{
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struct drm_device *dev = encoder->dev;
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struct drm_bridge *bridge, *next;
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/* Note that the encoder_list is considered to be static; should we
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* remove the drm_encoder at runtime we would have to decrement all
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* the indices on the drm_encoder after us in the encoder_list.
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*/
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list_for_each_entry_safe(bridge, next, &encoder->bridge_chain,
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chain_node)
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drm_bridge_detach(bridge);
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drm_mode_object_unregister(dev, &encoder->base);
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kfree(encoder->name);
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list_del(&encoder->head);
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dev->mode_config.num_encoder--;
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memset(encoder, 0, sizeof(*encoder));
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}
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EXPORT_SYMBOL(drm_encoder_cleanup);
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static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr)
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{
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struct drm_encoder *encoder = ptr;
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if (WARN_ON(!encoder->dev))
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return;
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drm_encoder_cleanup(encoder);
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}
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__printf(5, 0)
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static int __drmm_encoder_init(struct drm_device *dev,
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struct drm_encoder *encoder,
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const struct drm_encoder_funcs *funcs,
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int encoder_type,
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const char *name,
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va_list args)
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{
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int ret;
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if (drm_WARN_ON(dev, funcs && funcs->destroy))
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return -EINVAL;
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ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, args);
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if (ret)
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return ret;
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ret = drmm_add_action_or_reset(dev, drmm_encoder_alloc_release, encoder);
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if (ret)
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return ret;
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return 0;
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}
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void *__drmm_encoder_alloc(struct drm_device *dev, size_t size, size_t offset,
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const struct drm_encoder_funcs *funcs,
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int encoder_type, const char *name, ...)
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{
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void *container;
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struct drm_encoder *encoder;
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va_list ap;
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int ret;
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container = drmm_kzalloc(dev, size, GFP_KERNEL);
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if (!container)
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return ERR_PTR(-ENOMEM);
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encoder = container + offset;
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va_start(ap, name);
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ret = __drmm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
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va_end(ap);
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if (ret)
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return ERR_PTR(ret);
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return container;
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}
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EXPORT_SYMBOL(__drmm_encoder_alloc);
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/**
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* drmm_encoder_init - Initialize a preallocated encoder
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* @dev: drm device
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* @encoder: the encoder to init
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* @funcs: callbacks for this encoder (optional)
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* @encoder_type: user visible type of the encoder
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* @name: printf style format string for the encoder name, or NULL for default name
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*
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* Initializes a preallocated encoder. Encoder should be subclassed as
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* part of driver encoder objects. Cleanup is automatically handled
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* through registering drm_encoder_cleanup() with drmm_add_action(). The
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* encoder structure should be allocated with drmm_kzalloc().
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*
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* The @drm_encoder_funcs.destroy hook must be NULL.
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*
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* Returns:
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* Zero on success, error code on failure.
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*/
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int drmm_encoder_init(struct drm_device *dev, struct drm_encoder *encoder,
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const struct drm_encoder_funcs *funcs,
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int encoder_type, const char *name, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, name);
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ret = __drmm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
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va_end(ap);
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if (ret)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL(drmm_encoder_init);
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static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder)
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{
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struct drm_connector *connector;
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struct drm_device *dev = encoder->dev;
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bool uses_atomic = false;
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struct drm_connector_list_iter conn_iter;
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/* For atomic drivers only state objects are synchronously updated and
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* protected by modeset locks, so check those first. */
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drm_connector_list_iter_begin(dev, &conn_iter);
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drm_for_each_connector_iter(connector, &conn_iter) {
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if (!connector->state)
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continue;
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uses_atomic = true;
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if (connector->state->best_encoder != encoder)
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continue;
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drm_connector_list_iter_end(&conn_iter);
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return connector->state->crtc;
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}
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drm_connector_list_iter_end(&conn_iter);
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/* Don't return stale data (e.g. pending async disable). */
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if (uses_atomic)
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return NULL;
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return encoder->crtc;
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}
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int drm_mode_getencoder(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_mode_get_encoder *enc_resp = data;
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struct drm_encoder *encoder;
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struct drm_crtc *crtc;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return -EOPNOTSUPP;
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encoder = drm_encoder_find(dev, file_priv, enc_resp->encoder_id);
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if (!encoder)
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return -ENOENT;
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drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
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crtc = drm_encoder_get_crtc(encoder);
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if (crtc && drm_lease_held(file_priv, crtc->base.id))
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enc_resp->crtc_id = crtc->base.id;
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else
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enc_resp->crtc_id = 0;
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drm_modeset_unlock(&dev->mode_config.connection_mutex);
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enc_resp->encoder_type = encoder->encoder_type;
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enc_resp->encoder_id = encoder->base.id;
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enc_resp->possible_crtcs = drm_lease_filter_crtcs(file_priv,
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encoder->possible_crtcs);
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enc_resp->possible_clones = encoder->possible_clones;
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return 0;
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}
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