// SPDX-License-Identifier: GPL-2.0 or MIT/* * Copyright 2018 Noralf Trønnes */ #include <linux/dma-buf-map.h>#include <linux/list.h>#include <linux/module.h>#include <linux/mutex.h>#include <linux/seq_file.h>#include <linux/slab.h> #include <drm/drm_client.h>#include <drm/drm_debugfs.h>#include <drm/drm_device.h>#include <drm/drm_drv.h>#include <drm/drm_file.h>#include <drm/drm_fourcc.h>#include <drm/drm_framebuffer.h>#include <drm/drm_gem.h>#include <drm/drm_mode.h>#include <drm/drm_print.h> #include "drm_crtc_internal.h"#include "drm_internal.h" /** * DOC: overview * * This library provides support for clients running in the kernel like fbdev and bootsplash. * * GEM drivers which provide a GEM based dumb buffer with a virtual address are supported. */ static int drm_client_open(struct drm_client_dev *client){	struct drm_device *dev = client->dev;	struct drm_file *file; 	file = drm_file_alloc(dev->primary);	if (IS_ERR(file))		return PTR_ERR(file); 	mutex_lock(&dev->filelist_mutex);	list_add(&file->lhead, &dev->filelist_internal);	mutex_unlock(&dev->filelist_mutex); 	client->file = file; 	return 0;} static void drm_client_close(struct drm_client_dev *client){	struct drm_device *dev = client->dev; 	mutex_lock(&dev->filelist_mutex);	list_del(&client->file->lhead);	mutex_unlock(&dev->filelist_mutex); 	drm_file_free(client->file);} /** * drm_client_init - Initialise a DRM client * @dev: DRM device * @client: DRM client * @name: Client name * @funcs: DRM client functions (optional) * * This initialises the client and opens a &drm_file. * Use drm_client_register() to complete the process. * The caller needs to hold a reference on @dev before calling this function. * The client is freed when the &drm_device is unregistered. See drm_client_release(). * * Returns: * Zero on success or negative error code on failure. */int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,		    const char *name, const struct drm_client_funcs *funcs){	int ret; 	if (!drm_core_check_feature(dev, DRIVER_MODESET) || !dev->driver->dumb_create)		return -EOPNOTSUPP; 	if (funcs && !try_module_get(funcs->owner))		return -ENODEV; 	client->dev = dev;	client->name = name;	client->funcs = funcs; 	ret = drm_client_modeset_create(client);	if (ret)		goto err_put_module; 	ret = drm_client_open(client);	if (ret)		goto err_free; 	drm_dev_get(dev); 	return 0; err_free:	drm_client_modeset_free(client);err_put_module:	if (funcs)		module_put(funcs->owner); 	return ret;}EXPORT_SYMBOL(drm_client_init); /** * drm_client_register - Register client * @client: DRM client * * Add the client to the &drm_device client list to activate its callbacks. * @client must be initialized by a call to drm_client_init(). After * drm_client_register() it is no longer permissible to call drm_client_release() * directly (outside the unregister callback), instead cleanup will happen * automatically on driver unload. */void drm_client_register(struct drm_client_dev *client){	struct drm_device *dev = client->dev; 	mutex_lock(&dev->clientlist_mutex);	list_add(&client->list, &dev->clientlist);	mutex_unlock(&dev->clientlist_mutex);}EXPORT_SYMBOL(drm_client_register); /** * drm_client_release - Release DRM client resources * @client: DRM client * * Releases resources by closing the &drm_file that was opened by drm_client_init(). * It is called automatically if the &drm_client_funcs.unregister callback is _not_ set. * * This function should only be called from the unregister callback. An exception * is fbdev which cannot free the buffer if userspace has open file descriptors. * * Note: * Clients cannot initiate a release by themselves. This is done to keep the code simple. * The driver has to be unloaded before the client can be unloaded. */void drm_client_release(struct drm_client_dev *client){	struct drm_device *dev = client->dev; 	drm_dbg_kms(dev, "%s\n", client->name); 	drm_client_modeset_free(client);	drm_client_close(client);	drm_dev_put(dev);	if (client->funcs)		module_put(client->funcs->owner);}EXPORT_SYMBOL(drm_client_release); void drm_client_dev_unregister(struct drm_device *dev){	struct drm_client_dev *client, *tmp; 	if (!drm_core_check_feature(dev, DRIVER_MODESET))		return; 	mutex_lock(&dev->clientlist_mutex);	list_for_each_entry_safe(client, tmp, &dev->clientlist, list) {		list_del(&client->list);		if (client->funcs && client->funcs->unregister) {			client->funcs->unregister(client);		} else {			drm_client_release(client);			kfree(client);		}	}	mutex_unlock(&dev->clientlist_mutex);} /** * drm_client_dev_hotplug - Send hotplug event to clients * @dev: DRM device * * This function calls the &drm_client_funcs.hotplug callback on the attached clients. * * drm_kms_helper_hotplug_event() calls this function, so drivers that use it * don't need to call this function themselves. */void drm_client_dev_hotplug(struct drm_device *dev){	struct drm_client_dev *client;	int ret; 	if (!drm_core_check_feature(dev, DRIVER_MODESET))		return; 	mutex_lock(&dev->clientlist_mutex);	list_for_each_entry(client, &dev->clientlist, list) {		if (!client->funcs || !client->funcs->hotplug)			continue; 		ret = client->funcs->hotplug(client);		drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);	}	mutex_unlock(&dev->clientlist_mutex);}EXPORT_SYMBOL(drm_client_dev_hotplug); void drm_client_dev_restore(struct drm_device *dev){	struct drm_client_dev *client;	int ret; 	if (!drm_core_check_feature(dev, DRIVER_MODESET))		return; 	mutex_lock(&dev->clientlist_mutex);	list_for_each_entry(client, &dev->clientlist, list) {		if (!client->funcs || !client->funcs->restore)			continue; 		ret = client->funcs->restore(client);		drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);		if (!ret) /* The first one to return zero gets the privilege to restore */			break;	}	mutex_unlock(&dev->clientlist_mutex);} static void drm_client_buffer_delete(struct drm_client_buffer *buffer){	struct drm_device *dev = buffer->client->dev; 	drm_gem_vunmap(buffer->gem, &buffer->map); 	if (buffer->gem)		drm_gem_object_put(buffer->gem); 	if (buffer->handle)		drm_mode_destroy_dumb(dev, buffer->handle, buffer->client->file); 	kfree(buffer);} static struct drm_client_buffer *drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format){	const struct drm_format_info *info = drm_format_info(format);	struct drm_mode_create_dumb dumb_args = { };	struct drm_device *dev = client->dev;	struct drm_client_buffer *buffer;	struct drm_gem_object *obj;	int ret; 	buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);	if (!buffer)		return ERR_PTR(-ENOMEM); 	buffer->client = client; 	dumb_args.width = width;	dumb_args.height = height;	dumb_args.bpp = info->cpp[0] * 8;	ret = drm_mode_create_dumb(dev, &dumb_args, client->file);	if (ret)		goto err_delete; 	buffer->handle = dumb_args.handle;	buffer->pitch = dumb_args.pitch; 	obj = drm_gem_object_lookup(client->file, dumb_args.handle);	if (!obj)  {		ret = -ENOENT;		goto err_delete;	} 	buffer->gem = obj; 	return buffer; err_delete:	drm_client_buffer_delete(buffer); 	return ERR_PTR(ret);} /** * drm_client_buffer_vmap - Map DRM client buffer into address space * @buffer: DRM client buffer * @map_copy: Returns the mapped memory's address * * This function maps a client buffer into kernel address space. If the * buffer is already mapped, it returns the existing mapping's address. * * Client buffer mappings are not ref'counted. Each call to * drm_client_buffer_vmap() should be followed by a call to * drm_client_buffer_vunmap(); or the client buffer should be mapped * throughout its lifetime. * * The returned address is a copy of the internal value. In contrast to * other vmap interfaces, you don't need it for the client's vunmap * function. So you can modify it at will during blit and draw operations. * * Returns: *	0 on success, or a negative errno code otherwise. */intdrm_client_buffer_vmap(struct drm_client_buffer *buffer, struct dma_buf_map *map_copy){	struct dma_buf_map *map = &buffer->map;	int ret; 	/*	 * FIXME: The dependency on GEM here isn't required, we could	 * convert the driver handle to a dma-buf instead and use the	 * backend-agnostic dma-buf vmap support instead. This would	 * require that the handle2fd prime ioctl is reworked to pull the	 * fd_install step out of the driver backend hooks, to make that	 * final step optional for internal users.	 */	ret = drm_gem_vmap(buffer->gem, map);	if (ret)		return ret; 	*map_copy = *map; 	return 0;}EXPORT_SYMBOL(drm_client_buffer_vmap); /** * drm_client_buffer_vunmap - Unmap DRM client buffer * @buffer: DRM client buffer * * This function removes a client buffer's memory mapping. Calling this * function is only required by clients that manage their buffer mappings * by themselves. */void drm_client_buffer_vunmap(struct drm_client_buffer *buffer){	struct dma_buf_map *map = &buffer->map; 	drm_gem_vunmap(buffer->gem, map);}EXPORT_SYMBOL(drm_client_buffer_vunmap); static void drm_client_buffer_rmfb(struct drm_client_buffer *buffer){	int ret; 	if (!buffer->fb)		return; 	ret = drm_mode_rmfb(buffer->client->dev, buffer->fb->base.id, buffer->client->file);	if (ret)		drm_err(buffer->client->dev,			"Error removing FB:%u (%d)\n", buffer->fb->base.id, ret); 	buffer->fb = NULL;} static int drm_client_buffer_addfb(struct drm_client_buffer *buffer,				   u32 width, u32 height, u32 format){	struct drm_client_dev *client = buffer->client;	struct drm_mode_fb_cmd fb_req = { };	const struct drm_format_info *info;	int ret; 	info = drm_format_info(format);	fb_req.bpp = info->cpp[0] * 8;	fb_req.depth = info->depth;	fb_req.width = width;	fb_req.height = height;	fb_req.handle = buffer->handle;	fb_req.pitch = buffer->pitch; 	ret = drm_mode_addfb(client->dev, &fb_req, client->file);	if (ret)		return ret; 	buffer->fb = drm_framebuffer_lookup(client->dev, buffer->client->file, fb_req.fb_id);	if (WARN_ON(!buffer->fb))		return -ENOENT; 	/* drop the reference we picked up in framebuffer lookup */	drm_framebuffer_put(buffer->fb); 	strscpy(buffer->fb->comm, client->name, TASK_COMM_LEN); 	return 0;} /** * drm_client_framebuffer_create - Create a client framebuffer * @client: DRM client * @width: Framebuffer width * @height: Framebuffer height * @format: Buffer format * * This function creates a &drm_client_buffer which consists of a * &drm_framebuffer backed by a dumb buffer. * Call drm_client_framebuffer_delete() to free the buffer. * * Returns: * Pointer to a client buffer or an error pointer on failure. */struct drm_client_buffer *drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format){	struct drm_client_buffer *buffer;	int ret; 	buffer = drm_client_buffer_create(client, width, height, format);	if (IS_ERR(buffer))		return buffer; 	ret = drm_client_buffer_addfb(buffer, width, height, format);	if (ret) {		drm_client_buffer_delete(buffer);		return ERR_PTR(ret);	} 	return buffer;}EXPORT_SYMBOL(drm_client_framebuffer_create); /** * drm_client_framebuffer_delete - Delete a client framebuffer * @buffer: DRM client buffer (can be NULL) */void drm_client_framebuffer_delete(struct drm_client_buffer *buffer){	if (!buffer)		return; 	drm_client_buffer_rmfb(buffer);	drm_client_buffer_delete(buffer);}EXPORT_SYMBOL(drm_client_framebuffer_delete); /** * drm_client_framebuffer_flush - Manually flush client framebuffer * @buffer: DRM client buffer (can be NULL) * @rect: Damage rectangle (if NULL flushes all) * * This calls &drm_framebuffer_funcs->dirty (if present) to flush buffer changes * for drivers that need it. * * Returns: * Zero on success or negative error code on failure. */int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect){	if (!buffer || !buffer->fb || !buffer->fb->funcs->dirty)		return 0; 	if (rect) {		struct drm_clip_rect clip = {			.x1 = rect->x1,			.y1 = rect->y1,			.x2 = rect->x2,			.y2 = rect->y2,		}; 		return buffer->fb->funcs->dirty(buffer->fb, buffer->client->file,						0, 0, &clip, 1);	} 	return buffer->fb->funcs->dirty(buffer->fb, buffer->client->file,					0, 0, NULL, 0);}EXPORT_SYMBOL(drm_client_framebuffer_flush); #ifdef CONFIG_DEBUG_FSstatic int drm_client_debugfs_internal_clients(struct seq_file *m, void *data){	struct drm_info_node *node = m->private;	struct drm_device *dev = node->minor->dev;	struct drm_printer p = drm_seq_file_printer(m);	struct drm_client_dev *client; 	mutex_lock(&dev->clientlist_mutex);	list_for_each_entry(client, &dev->clientlist, list)		drm_printf(&p, "%s\n", client->name);	mutex_unlock(&dev->clientlist_mutex); 	return 0;} static const struct drm_info_list drm_client_debugfs_list[] = {	{ "internal_clients", drm_client_debugfs_internal_clients, 0 },}; void drm_client_debugfs_init(struct drm_minor *minor){

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