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![Noralf Trønnes](/assets/img/avatar_default.png)
struct drm_fb_helper_crtc is now just a wrapper around drm_mode_set so use that directly instead and attach it as a modeset array onto drm_client_dev. drm_fb_helper will use this array to store its modesets which means it will always initialize a drm_client, but it will not register the client (callbacks) unless it's the generic fbdev emulation. Code will later be moved to drm_client, so add code there in a new file drm_client_modeset.c with MIT license to match drm_fb_helper.c. The modeset connector array size is hardcoded for the cloned case to avoid having to pass in a value from the driver. A value of 8 is chosen to err on the safe side. This means that the max connector argument for drm_fb_helper_init() and drm_fb_helper_fbdev_setup() isn't used anymore, a todo entry for this is added. In pan_display_atomic() restore_fbdev_mode_force() is used instead of restore_fbdev_mode_atomic() because that one will later become internal to drm_client_modeset. Locking order: 1. drm_fb_helper->lock 2. drm_master_internal_acquire 3. drm_client_dev->modeset_mutex v6: Improve commit message (Sam Ravnborg) v3: - Use full drm_client_init/release for the modesets (Daniel Vetter) - drm_client_for_each_modeset: use lockdep_assert_held (Daniel Vetter) - Hook up to Documentation/gpu/drm-client.rst (Daniel Vetter) v2: - Add modesets array to drm_client (Daniel Vetter) - Use a new file for the modeset code (Daniel Vetter) - File has to be MIT licensed (Emmanuel Vadot) - Add copyrights from drm_fb_helper.c Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190531140117.37751-3-noralf@tronnes.org
429 lines
11 KiB
C
429 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2018 Noralf Trønnes
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*/
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <drm/drm_client.h>
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#include <drm/drm_debugfs.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_file.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_mode.h>
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#include <drm/drm_print.h>
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#include "drm_crtc_internal.h"
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#include "drm_internal.h"
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/**
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* DOC: overview
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*
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* This library provides support for clients running in the kernel like fbdev and bootsplash.
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*
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* GEM drivers which provide a GEM based dumb buffer with a virtual address are supported.
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*/
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static int drm_client_open(struct drm_client_dev *client)
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{
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struct drm_device *dev = client->dev;
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struct drm_file *file;
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file = drm_file_alloc(dev->primary);
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if (IS_ERR(file))
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return PTR_ERR(file);
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mutex_lock(&dev->filelist_mutex);
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list_add(&file->lhead, &dev->filelist_internal);
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mutex_unlock(&dev->filelist_mutex);
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client->file = file;
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return 0;
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}
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static void drm_client_close(struct drm_client_dev *client)
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{
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struct drm_device *dev = client->dev;
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mutex_lock(&dev->filelist_mutex);
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list_del(&client->file->lhead);
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mutex_unlock(&dev->filelist_mutex);
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drm_file_free(client->file);
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}
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EXPORT_SYMBOL(drm_client_close);
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/**
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* drm_client_init - Initialise a DRM client
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* @dev: DRM device
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* @client: DRM client
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* @name: Client name
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* @funcs: DRM client functions (optional)
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*
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* This initialises the client and opens a &drm_file.
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* Use drm_client_register() to complete the process.
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* The caller needs to hold a reference on @dev before calling this function.
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* The client is freed when the &drm_device is unregistered. See drm_client_release().
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*
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* Returns:
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* Zero on success or negative error code on failure.
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*/
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int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
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const char *name, const struct drm_client_funcs *funcs)
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{
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int ret;
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if (!drm_core_check_feature(dev, DRIVER_MODESET) || !dev->driver->dumb_create)
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return -EOPNOTSUPP;
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if (funcs && !try_module_get(funcs->owner))
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return -ENODEV;
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client->dev = dev;
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client->name = name;
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client->funcs = funcs;
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ret = drm_client_modeset_create(client);
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if (ret)
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goto err_put_module;
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ret = drm_client_open(client);
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if (ret)
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goto err_free;
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drm_dev_get(dev);
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return 0;
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err_free:
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drm_client_modeset_free(client);
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err_put_module:
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if (funcs)
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module_put(funcs->owner);
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return ret;
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}
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EXPORT_SYMBOL(drm_client_init);
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/**
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* drm_client_register - Register client
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* @client: DRM client
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*
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* Add the client to the &drm_device client list to activate its callbacks.
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* @client must be initialized by a call to drm_client_init(). After
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* drm_client_register() it is no longer permissible to call drm_client_release()
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* directly (outside the unregister callback), instead cleanup will happen
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* automatically on driver unload.
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*/
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void drm_client_register(struct drm_client_dev *client)
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{
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struct drm_device *dev = client->dev;
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mutex_lock(&dev->clientlist_mutex);
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list_add(&client->list, &dev->clientlist);
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mutex_unlock(&dev->clientlist_mutex);
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}
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EXPORT_SYMBOL(drm_client_register);
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/**
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* drm_client_release - Release DRM client resources
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* @client: DRM client
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*
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* Releases resources by closing the &drm_file that was opened by drm_client_init().
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* It is called automatically if the &drm_client_funcs.unregister callback is _not_ set.
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*
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* This function should only be called from the unregister callback. An exception
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* is fbdev which cannot free the buffer if userspace has open file descriptors.
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*
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* Note:
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* Clients cannot initiate a release by themselves. This is done to keep the code simple.
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* The driver has to be unloaded before the client can be unloaded.
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*/
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void drm_client_release(struct drm_client_dev *client)
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{
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struct drm_device *dev = client->dev;
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DRM_DEV_DEBUG_KMS(dev->dev, "%s\n", client->name);
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drm_client_modeset_free(client);
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drm_client_close(client);
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drm_dev_put(dev);
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if (client->funcs)
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module_put(client->funcs->owner);
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}
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EXPORT_SYMBOL(drm_client_release);
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void drm_client_dev_unregister(struct drm_device *dev)
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{
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struct drm_client_dev *client, *tmp;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return;
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mutex_lock(&dev->clientlist_mutex);
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list_for_each_entry_safe(client, tmp, &dev->clientlist, list) {
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list_del(&client->list);
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if (client->funcs && client->funcs->unregister) {
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client->funcs->unregister(client);
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} else {
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drm_client_release(client);
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kfree(client);
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}
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}
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mutex_unlock(&dev->clientlist_mutex);
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}
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/**
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* drm_client_dev_hotplug - Send hotplug event to clients
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* @dev: DRM device
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*
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* This function calls the &drm_client_funcs.hotplug callback on the attached clients.
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*
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* drm_kms_helper_hotplug_event() calls this function, so drivers that use it
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* don't need to call this function themselves.
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*/
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void drm_client_dev_hotplug(struct drm_device *dev)
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{
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struct drm_client_dev *client;
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int ret;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return;
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mutex_lock(&dev->clientlist_mutex);
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list_for_each_entry(client, &dev->clientlist, list) {
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if (!client->funcs || !client->funcs->hotplug)
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continue;
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ret = client->funcs->hotplug(client);
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DRM_DEV_DEBUG_KMS(dev->dev, "%s: ret=%d\n", client->name, ret);
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}
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mutex_unlock(&dev->clientlist_mutex);
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}
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EXPORT_SYMBOL(drm_client_dev_hotplug);
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void drm_client_dev_restore(struct drm_device *dev)
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{
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struct drm_client_dev *client;
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int ret;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return;
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mutex_lock(&dev->clientlist_mutex);
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list_for_each_entry(client, &dev->clientlist, list) {
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if (!client->funcs || !client->funcs->restore)
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continue;
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ret = client->funcs->restore(client);
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DRM_DEV_DEBUG_KMS(dev->dev, "%s: ret=%d\n", client->name, ret);
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if (!ret) /* The first one to return zero gets the privilege to restore */
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break;
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}
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mutex_unlock(&dev->clientlist_mutex);
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}
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static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
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{
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struct drm_device *dev = buffer->client->dev;
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drm_gem_vunmap(buffer->gem, buffer->vaddr);
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if (buffer->gem)
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drm_gem_object_put_unlocked(buffer->gem);
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if (buffer->handle)
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drm_mode_destroy_dumb(dev, buffer->handle, buffer->client->file);
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kfree(buffer);
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}
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static struct drm_client_buffer *
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drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
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{
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const struct drm_format_info *info = drm_format_info(format);
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struct drm_mode_create_dumb dumb_args = { };
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struct drm_device *dev = client->dev;
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struct drm_client_buffer *buffer;
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struct drm_gem_object *obj;
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void *vaddr;
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int ret;
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buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
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if (!buffer)
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return ERR_PTR(-ENOMEM);
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buffer->client = client;
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dumb_args.width = width;
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dumb_args.height = height;
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dumb_args.bpp = info->cpp[0] * 8;
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ret = drm_mode_create_dumb(dev, &dumb_args, client->file);
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if (ret)
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goto err_delete;
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buffer->handle = dumb_args.handle;
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buffer->pitch = dumb_args.pitch;
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obj = drm_gem_object_lookup(client->file, dumb_args.handle);
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if (!obj) {
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ret = -ENOENT;
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goto err_delete;
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}
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buffer->gem = obj;
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/*
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* FIXME: The dependency on GEM here isn't required, we could
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* convert the driver handle to a dma-buf instead and use the
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* backend-agnostic dma-buf vmap support instead. This would
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* require that the handle2fd prime ioctl is reworked to pull the
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* fd_install step out of the driver backend hooks, to make that
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* final step optional for internal users.
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*/
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vaddr = drm_gem_vmap(obj);
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if (IS_ERR(vaddr)) {
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ret = PTR_ERR(vaddr);
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goto err_delete;
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}
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buffer->vaddr = vaddr;
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return buffer;
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err_delete:
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drm_client_buffer_delete(buffer);
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return ERR_PTR(ret);
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}
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static void drm_client_buffer_rmfb(struct drm_client_buffer *buffer)
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{
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int ret;
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if (!buffer->fb)
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return;
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ret = drm_mode_rmfb(buffer->client->dev, buffer->fb->base.id, buffer->client->file);
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if (ret)
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DRM_DEV_ERROR(buffer->client->dev->dev,
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"Error removing FB:%u (%d)\n", buffer->fb->base.id, ret);
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buffer->fb = NULL;
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}
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static int drm_client_buffer_addfb(struct drm_client_buffer *buffer,
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u32 width, u32 height, u32 format)
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{
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struct drm_client_dev *client = buffer->client;
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struct drm_mode_fb_cmd fb_req = { };
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const struct drm_format_info *info;
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int ret;
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info = drm_format_info(format);
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fb_req.bpp = info->cpp[0] * 8;
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fb_req.depth = info->depth;
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fb_req.width = width;
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fb_req.height = height;
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fb_req.handle = buffer->handle;
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fb_req.pitch = buffer->pitch;
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ret = drm_mode_addfb(client->dev, &fb_req, client->file);
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if (ret)
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return ret;
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buffer->fb = drm_framebuffer_lookup(client->dev, buffer->client->file, fb_req.fb_id);
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if (WARN_ON(!buffer->fb))
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return -ENOENT;
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/* drop the reference we picked up in framebuffer lookup */
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drm_framebuffer_put(buffer->fb);
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strscpy(buffer->fb->comm, client->name, TASK_COMM_LEN);
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return 0;
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}
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/**
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* drm_client_framebuffer_create - Create a client framebuffer
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* @client: DRM client
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* @width: Framebuffer width
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* @height: Framebuffer height
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* @format: Buffer format
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*
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* This function creates a &drm_client_buffer which consists of a
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* &drm_framebuffer backed by a dumb buffer.
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* Call drm_client_framebuffer_delete() to free the buffer.
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*
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* Returns:
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* Pointer to a client buffer or an error pointer on failure.
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*/
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struct drm_client_buffer *
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drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
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{
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struct drm_client_buffer *buffer;
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int ret;
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buffer = drm_client_buffer_create(client, width, height, format);
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if (IS_ERR(buffer))
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return buffer;
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ret = drm_client_buffer_addfb(buffer, width, height, format);
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if (ret) {
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drm_client_buffer_delete(buffer);
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return ERR_PTR(ret);
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}
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return buffer;
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}
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EXPORT_SYMBOL(drm_client_framebuffer_create);
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/**
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* drm_client_framebuffer_delete - Delete a client framebuffer
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* @buffer: DRM client buffer (can be NULL)
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*/
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void drm_client_framebuffer_delete(struct drm_client_buffer *buffer)
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{
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if (!buffer)
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return;
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drm_client_buffer_rmfb(buffer);
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drm_client_buffer_delete(buffer);
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}
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EXPORT_SYMBOL(drm_client_framebuffer_delete);
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#ifdef CONFIG_DEBUG_FS
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static int drm_client_debugfs_internal_clients(struct seq_file *m, void *data)
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{
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struct drm_info_node *node = m->private;
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struct drm_device *dev = node->minor->dev;
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struct drm_printer p = drm_seq_file_printer(m);
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struct drm_client_dev *client;
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mutex_lock(&dev->clientlist_mutex);
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list_for_each_entry(client, &dev->clientlist, list)
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drm_printf(&p, "%s\n", client->name);
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mutex_unlock(&dev->clientlist_mutex);
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return 0;
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}
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static const struct drm_info_list drm_client_debugfs_list[] = {
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{ "internal_clients", drm_client_debugfs_internal_clients, 0 },
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};
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int drm_client_debugfs_init(struct drm_minor *minor)
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{
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return drm_debugfs_create_files(drm_client_debugfs_list,
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ARRAY_SIZE(drm_client_debugfs_list),
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minor->debugfs_root, minor);
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}
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#endif
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