/* * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Daryll Strauss <daryll@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ /* * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include <linux/anon_inodes.h>#include <linux/dma-fence.h>#include <linux/export.h>#include <linux/file.h>#include <linux/module.h>#include <linux/pci.h>#include <linux/poll.h>#include <linux/slab.h>#include <linux/vga_switcheroo.h> #include <drm/drm_client_event.h>#include <drm/drm_drv.h>#include <drm/drm_file.h>#include <drm/drm_gem.h>#include <drm/drm_print.h>#include <drm/drm_debugfs.h> #include "drm_crtc_internal.h"#include "drm_internal.h" /* from BKL pushdown */DEFINE_MUTEX(drm_global_mutex); bool drm_dev_needs_global_mutex(struct drm_device *dev){ /* * The deprecated ->load callback must be called after the driver is * already registered. This means such drivers rely on the BKL to make * sure an open can't proceed until the driver is actually fully set up. * Similar hilarity holds for the unload callback. */ if (dev->driver->load || dev->driver->unload) return true; return false;} /** * DOC: file operations * * Drivers must define the file operations structure that forms the DRM * userspace API entry point, even though most of those operations are * implemented in the DRM core. The resulting &struct file_operations must be * stored in the &drm_driver.fops field. The mandatory functions are drm_open(), * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled * Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no * need to sprinkle #ifdef into the code. Drivers which implement private ioctls * that require 32/64 bit compatibility support must provide their own * &file_operations.compat_ioctl handler that processes private ioctls and calls * drm_compat_ioctl() for core ioctls. * * In addition drm_read() and drm_poll() provide support for DRM events. DRM * events are a generic and extensible means to send asynchronous events to * userspace through the file descriptor. They are used to send vblank event and * page flip completions by the KMS API. But drivers can also use it for their * own needs, e.g. to signal completion of rendering. * * For the driver-side event interface see drm_event_reserve_init() and * drm_send_event() as the main starting points. * * The memory mapping implementation will vary depending on how the driver * manages memory. For GEM-based drivers this is drm_gem_mmap(). * * No other file operations are supported by the DRM userspace API. Overall the * following is an example &file_operations structure:: * * static const example_drm_fops = { * .owner = THIS_MODULE, * .open = drm_open, * .release = drm_release, * .unlocked_ioctl = drm_ioctl, * .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n * .poll = drm_poll, * .read = drm_read, * .mmap = drm_gem_mmap, * }; * * For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for * DMA based drivers there is the DEFINE_DRM_GEM_DMA_FOPS() macro to make this * simpler. * * The driver's &file_operations must be stored in &drm_driver.fops. * * For driver-private IOCTL handling see the more detailed discussion in * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`. */ /** * drm_file_alloc - allocate file context * @minor: minor to allocate on * * This allocates a new DRM file context. It is not linked into any context and * can be used by the caller freely. Note that the context keeps a pointer to * @minor, so it must be freed before @minor is. * * RETURNS: * Pointer to newly allocated context, ERR_PTR on failure. */struct drm_file *drm_file_alloc(struct drm_minor *minor){ static atomic64_t ident = ATOMIC64_INIT(0); struct drm_device *dev = minor->dev; struct drm_file *file; int ret; file = kzalloc_obj(*file); if (!file) return ERR_PTR(-ENOMEM); /* Get a unique identifier for fdinfo: */ file->client_id = atomic64_inc_return(&ident); rcu_assign_pointer(file->pid, get_pid(task_tgid(current))); file->minor = minor; /* for compatibility root is always authenticated */ file->authenticated = capable(CAP_SYS_ADMIN); INIT_LIST_HEAD(&file->lhead); INIT_LIST_HEAD(&file->fbs); mutex_init(&file->fbs_lock); INIT_LIST_HEAD(&file->blobs); INIT_LIST_HEAD(&file->pending_event_list); INIT_LIST_HEAD(&file->event_list); init_waitqueue_head(&file->event_wait); file->event_space = 4096; /* set aside 4k for event buffer */ spin_lock_init(&file->master_lookup_lock); mutex_init(&file->event_read_lock); mutex_init(&file->client_name_lock); if (drm_core_check_feature(dev, DRIVER_GEM)) drm_gem_open(dev, file); if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) drm_syncobj_open(file); drm_prime_init_file_private(&file->prime); if (!drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) drm_debugfs_clients_add(file); if (dev->driver->open) { ret = dev->driver->open(dev, file); if (ret < 0) goto out_prime_destroy; } return file; out_prime_destroy: drm_prime_destroy_file_private(&file->prime); if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) drm_syncobj_release(file); if (drm_core_check_feature(dev, DRIVER_GEM)) drm_gem_release(dev, file); if (!drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) drm_debugfs_clients_remove(file); put_pid(rcu_access_pointer(file->pid)); kfree(file); return ERR_PTR(ret);} static void drm_events_release(struct drm_file *file_priv){ struct drm_device *dev = file_priv->minor->dev; struct drm_pending_event *e, *et; unsigned long flags; spin_lock_irqsave(&dev->event_lock, flags); /* Unlink pending events */ list_for_each_entry_safe(e, et, &file_priv->pending_event_list, pending_link) { list_del(&e->pending_link); e->file_priv = NULL; } /* Remove unconsumed events */ list_for_each_entry_safe(e, et, &file_priv->event_list, link) { list_del(&e->link); kfree(e); } spin_unlock_irqrestore(&dev->event_lock, flags);} /** * drm_file_free - free file context * @file: context to free, or NULL * * This destroys and deallocates a DRM file context previously allocated via * drm_file_alloc(). The caller must make sure to unlink it from any contexts * before calling this. * * If NULL is passed, this is a no-op. */void drm_file_free(struct drm_file *file){ struct drm_device *dev; if (!file) return; dev = file->minor->dev; drm_dbg_core(dev, "comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n", current->comm, task_pid_nr(current), (long)old_encode_dev(file->minor->kdev->devt), atomic_read(&dev->open_count)); if (!drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) drm_debugfs_clients_remove(file); drm_events_release(file); if (drm_core_check_feature(dev, DRIVER_MODESET)) { drm_fb_release(file); drm_property_destroy_user_blobs(dev, file); } if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) drm_syncobj_release(file); if (drm_core_check_feature(dev, DRIVER_GEM)) drm_gem_release(dev, file); if (drm_is_primary_client(file)) drm_master_release(file); if (dev->driver->postclose) dev->driver->postclose(dev, file); drm_prime_destroy_file_private(&file->prime); WARN_ON(!list_empty(&file->event_list)); put_pid(rcu_access_pointer(file->pid)); mutex_destroy(&file->client_name_lock); kfree(file->client_name); kfree(file);} static void drm_close_helper(struct file *filp){ struct drm_file *file_priv = filp->private_data; struct drm_device *dev = file_priv->minor->dev; mutex_lock(&dev->filelist_mutex); list_del(&file_priv->lhead); mutex_unlock(&dev->filelist_mutex); drm_file_free(file_priv);} /* * Check whether DRI will run on this CPU. * * \return non-zero if the DRI will run on this CPU, or zero otherwise. */static int drm_cpu_valid(void){#if defined(__sparc__) && !defined(__sparc_v9__) return 0; /* No cmpxchg before v9 sparc. */#endif return 1;} /* * Called whenever a process opens a drm node * * \param filp file pointer. * \param minor acquired minor-object. * \return zero on success or a negative number on failure. * * Creates and initializes a drm_file structure for the file private data in \p * filp and add it into the double linked list in \p dev. */int drm_open_helper(struct file *filp, struct drm_minor *minor){ struct drm_device *dev = minor->dev; struct drm_file *priv; int ret; if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */ if (!drm_cpu_valid()) return -EINVAL; if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) return -EINVAL; if (WARN_ON_ONCE(!(filp->f_op->fop_flags & FOP_UNSIGNED_OFFSET))) return -EINVAL; drm_dbg_core(dev, "comm=\"%s\", pid=%d, minor=%d\n", current->comm, task_pid_nr(current), minor->index); priv = drm_file_alloc(minor); if (IS_ERR(priv)) return PTR_ERR(priv); if (drm_is_primary_client(priv)) { ret = drm_master_open(priv); if (ret) { drm_file_free(priv); return ret; } } filp->private_data = priv; priv->filp = filp; mutex_lock(&dev->filelist_mutex); list_add(&priv->lhead, &dev->filelist); mutex_unlock(&dev->filelist_mutex); return 0;} /** * drm_open - open method for DRM file * @inode: device inode * @filp: file pointer. * * This function must be used by drivers as their &file_operations.open method. * It looks up the correct DRM device and instantiates all the per-file * resources for it. It also calls the &drm_driver.open driver callback. * * RETURNS: * 0 on success or negative errno value on failure. */int drm_open(struct inode *inode, struct file *filp){ struct drm_device *dev; struct drm_minor *minor; int retcode; minor = drm_minor_acquire(&drm_minors_xa, iminor(inode)); if (IS_ERR(minor)) return PTR_ERR(minor); dev = minor->dev; if (drm_dev_needs_global_mutex(dev)) mutex_lock(&drm_global_mutex); atomic_fetch_inc(&dev->open_count); /* share address_space across all char-devs of a single device */ filp->f_mapping = dev->anon_inode->i_mapping; retcode = drm_open_helper(filp, minor); if (retcode) goto err_undo; if (drm_dev_needs_global_mutex(dev)) mutex_unlock(&drm_global_mutex); return 0; err_undo: atomic_dec(&dev->open_count); if (drm_dev_needs_global_mutex(dev)) mutex_unlock(&drm_global_mutex); drm_minor_release(minor); return retcode;}EXPORT_SYMBOL(drm_open); static void drm_lastclose(struct drm_device *dev){ drm_client_dev_restore(dev, false); if (dev_is_pci(dev->dev)) vga_switcheroo_process_delayed_switch();} /** * drm_release - release method for DRM file * @inode: device inode * @filp: file pointer. * * This function must be used by drivers as their &file_operations.release * method. It frees any resources associated with the open file. If this * is the last open file for the DRM device, it also restores the active * in-kernel DRM client. * * RETURNS: * Always succeeds and returns 0. */int drm_release(struct inode *inode, struct file *filp){ struct drm_file *file_priv = filp->private_data; struct drm_minor *minor = file_priv->minor; struct drm_device *dev = minor->dev; if (drm_dev_needs_global_mutex(dev)) mutex_lock(&drm_global_mutex); drm_dbg_core(dev, "open_count = %d\n", atomic_read(&dev->open_count)); drm_close_helper(filp); if (atomic_dec_and_test(&dev->open_count)) drm_lastclose(dev); if (drm_dev_needs_global_mutex(dev)) mutex_unlock(&drm_global_mutex); drm_minor_release(minor); return 0;}EXPORT_SYMBOL(drm_release); void drm_file_update_pid(struct drm_file *filp){ struct drm_device *dev; struct pid *pid, *old; /* * Master nodes need to keep the original ownership in order for * drm_master_check_perm to keep working correctly. (See comment in * drm_auth.c.) */ if (filp->was_master) return; pid = task_tgid(current); /* * Quick unlocked check since the model is a single handover followed by * exclusive repeated use. */ if (pid == rcu_access_pointer(filp->pid)) return; dev = filp->minor->dev; mutex_lock(&dev->filelist_mutex); get_pid(pid); old = rcu_replace_pointer(filp->pid, pid, 1); mutex_unlock(&dev->filelist_mutex); synchronize_rcu(); put_pid(old);} /** * drm_release_noglobal - release method for DRM file * @inode: device inode * @filp: file pointer. * * This function may be used by drivers as their &file_operations.release * method. It frees any resources associated with the open file prior to taking * the drm_global_mutex. If this is the last open file for the DRM device, it * then restores the active in-kernel DRM client. * * RETURNS: * Always succeeds and returns 0. */int drm_release_noglobal(struct inode *inode, struct file *filp){ struct drm_file *file_priv = filp->private_data; struct drm_minor *minor = file_priv->minor;Lines 1–500 of 1081. Load more
/* * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Daryll Strauss <daryll@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ /* * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include <linux/anon_inodes.h> #include <linux/dma-fence.h> #include <linux/export.h> #include <linux/file.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/vga_switcheroo.h> #include <drm/drm_client_event.h> #include <drm/drm_drv.h> #include <drm/drm_file.h> #include <drm/drm_gem.h> #include <drm/drm_print.h> #include <drm/drm_debugfs.h> #include "drm_crtc_internal.h" #include "drm_internal.h" /* from BKL pushdown */ DEFINE_MUTEX(drm_global_mutex); bool drm_dev_needs_global_mutex(struct drm_device *dev) { /* * The deprecated ->load callback must be called after the driver is * already registered. This means such drivers rely on the BKL to make * sure an open can't proceed until the driver is actually fully set up. * Similar hilarity holds for the unload callback. */ if (dev->driver->load || dev->driver->unload) return true; return false; } /** * DOC: file operations * * Drivers must define the file operations structure that forms the DRM * userspace API entry point, even though most of those operations are * implemented in the DRM core. The resulting &struct file_operations must be * stored in the &drm_driver.fops field. The mandatory functions are drm_open(), * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled * Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no * need to sprinkle #ifdef into the code. Drivers which implement private ioctls * that require 32/64 bit compatibility support must provide their own * &file_operations.compat_ioctl handler that processes private ioctls and calls * drm_compat_ioctl() for core ioctls. * * In addition drm_read() and drm_poll() provide support for DRM events. DRM * events are a generic and extensible means to send asynchronous events to * userspace through the file descriptor. They are used to send vblank event and * page flip completions by the KMS API. But drivers can also use it for their * own needs, e.g. to signal completion of rendering. * * For the driver-side event interface see drm_event_reserve_init() and * drm_send_event() as the main starting points. * * The memory mapping implementation will vary depending on how the driver * manages memory. For GEM-based drivers this is drm_gem_mmap(). * * No other file operations are supported by the DRM userspace API. Overall the * following is an example &file_operations structure:: * * static const example_drm_fops = { * .owner = THIS_MODULE, * .open = drm_open, * .release = drm_release, * .unlocked_ioctl = drm_ioctl, * .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n * .poll = drm_poll, * .read = drm_read, * .mmap = drm_gem_mmap, * }; * * For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for * DMA based drivers there is the DEFINE_DRM_GEM_DMA_FOPS() macro to make this * simpler. * * The driver's &file_operations must be stored in &drm_driver.fops. * * For driver-private IOCTL handling see the more detailed discussion in * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`. */ /** * drm_file_alloc - allocate file context * @minor: minor to allocate on * * This allocates a new DRM file context. It is not linked into any context and * can be used by the caller freely. Note that the context keeps a pointer to * @minor, so it must be freed before @minor is. * * RETURNS: * Pointer to newly allocated context, ERR_PTR on failure. */ struct drm_file *drm_file_alloc(struct drm_minor *minor) { static atomic64_t ident = ATOMIC64_INIT(0); struct drm_device *dev = minor->dev; struct drm_file *file; int ret; file = kzalloc_obj(*file); if (!file) return ERR_PTR(-ENOMEM); /* Get a unique identifier for fdinfo: */ file->client_id = atomic64_inc_return(&ident); rcu_assign_pointer(file->pid, get_pid(task_tgid(current))); file->minor = minor; /* for compatibility root is always authenticated */ file->authenticated = capable(CAP_SYS_ADMIN); INIT_LIST_HEAD(&file->lhead); INIT_LIST_HEAD(&file->fbs); mutex_init(&file->fbs_lock); INIT_LIST_HEAD(&file->blobs); INIT_LIST_HEAD(&file->pending_event_list); INIT_LIST_HEAD(&file->event_list); init_waitqueue_head(&file->event_wait); file->event_space = 4096; /* set aside 4k for event buffer */ spin_lock_init(&file->master_lookup_lock); mutex_init(&file->event_read_lock); mutex_init(&file->client_name_lock); if (drm_core_check_feature(dev, DRIVER_GEM)) drm_gem_open(dev, file); if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) drm_syncobj_open(file); drm_prime_init_file_private(&file->prime); if (!drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) drm_debugfs_clients_add(file); if (dev->driver->open) { ret = dev->driver->open(dev, file); if (ret < 0) goto out_prime_destroy; } return file; out_prime_destroy: drm_prime_destroy_file_private(&file->prime); if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) drm_syncobj_release(file); if (drm_core_check_feature(dev, DRIVER_GEM)) drm_gem_release(dev, file); if (!drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) drm_debugfs_clients_remove(file); put_pid(rcu_access_pointer(file->pid)); kfree(file); return ERR_PTR(ret); } static void drm_events_release(struct drm_file *file_priv) { struct drm_device *dev = file_priv->minor->dev; struct drm_pending_event *e, *et; unsigned long flags; spin_lock_irqsave(&dev->event_lock, flags); /* Unlink pending events */ list_for_each_entry_safe(e, et, &file_priv->pending_event_list, pending_link) { list_del(&e->pending_link); e->file_priv = NULL; } /* Remove unconsumed events */ list_for_each_entry_safe(e, et, &file_priv->event_list, link) { list_del(&e->link); kfree(e); } spin_unlock_irqrestore(&dev->event_lock, flags); } /** * drm_file_free - free file context * @file: context to free, or NULL * * This destroys and deallocates a DRM file context previously allocated via * drm_file_alloc(). The caller must make sure to unlink it from any contexts * before calling this. * * If NULL is passed, this is a no-op. */ void drm_file_free(struct drm_file *file) { struct drm_device *dev; if (!file) return; dev = file->minor->dev; drm_dbg_core(dev, "comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n", current->comm, task_pid_nr(current), (long)old_encode_dev(file->minor->kdev->devt), atomic_read(&dev->open_count)); if (!drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) drm_debugfs_clients_remove(file); drm_events_release(file); if (drm_core_check_feature(dev, DRIVER_MODESET)) { drm_fb_release(file); drm_property_destroy_user_blobs(dev, file); } if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) drm_syncobj_release(file); if (drm_core_check_feature(dev, DRIVER_GEM)) drm_gem_release(dev, file); if (drm_is_primary_client(file)) drm_master_release(file); if (dev->driver->postclose) dev->driver->postclose(dev, file); drm_prime_destroy_file_private(&file->prime); WARN_ON(!list_empty(&file->event_list)); put_pid(rcu_access_pointer(file->pid)); mutex_destroy(&file->client_name_lock); kfree(file->client_name); kfree(file); } static void drm_close_helper(struct file *filp) { struct drm_file *file_priv = filp->private_data; struct drm_device *dev = file_priv->minor->dev; mutex_lock(&dev->filelist_mutex); list_del(&file_priv->lhead); mutex_unlock(&dev->filelist_mutex); drm_file_free(file_priv); } /* * Check whether DRI will run on this CPU. * * \return non-zero if the DRI will run on this CPU, or zero otherwise. */ static int drm_cpu_valid(void) { #if defined(__sparc__) && !defined(__sparc_v9__) return 0; /* No cmpxchg before v9 sparc. */ #endif return 1; } /* * Called whenever a process opens a drm node * * \param filp file pointer. * \param minor acquired minor-object. * \return zero on success or a negative number on failure. * * Creates and initializes a drm_file structure for the file private data in \p * filp and add it into the double linked list in \p dev. */ int drm_open_helper(struct file *filp, struct drm_minor *minor) { struct drm_device *dev = minor->dev; struct drm_file *priv; int ret; if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */ if (!drm_cpu_valid()) return -EINVAL; if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) return -EINVAL; if (WARN_ON_ONCE(!(filp->f_op->fop_flags & FOP_UNSIGNED_OFFSET))) return -EINVAL; drm_dbg_core(dev, "comm=\"%s\", pid=%d, minor=%d\n", current->comm, task_pid_nr(current), minor->index); priv = drm_file_alloc(minor); if (IS_ERR(priv)) return PTR_ERR(priv); if (drm_is_primary_client(priv)) { ret = drm_master_open(priv); if (ret) { drm_file_free(priv); return ret; } } filp->private_data = priv; priv->filp = filp; mutex_lock(&dev->filelist_mutex); list_add(&priv->lhead, &dev->filelist); mutex_unlock(&dev->filelist_mutex); return 0; } /** * drm_open - open method for DRM file * @inode: device inode * @filp: file pointer. * * This function must be used by drivers as their &file_operations.open method. * It looks up the correct DRM device and instantiates all the per-file * resources for it. It also calls the &drm_driver.open driver callback. * * RETURNS: * 0 on success or negative errno value on failure. */ int drm_open(struct inode *inode, struct file *filp) { struct drm_device *dev; struct drm_minor *minor; int retcode; minor = drm_minor_acquire(&drm_minors_xa, iminor(inode)); if (IS_ERR(minor)) return PTR_ERR(minor); dev = minor->dev; if (drm_dev_needs_global_mutex(dev)) mutex_lock(&drm_global_mutex); atomic_fetch_inc(&dev->open_count); /* share address_space across all char-devs of a single device */ filp->f_mapping = dev->anon_inode->i_mapping; retcode = drm_open_helper(filp, minor); if (retcode) goto err_undo; if (drm_dev_needs_global_mutex(dev)) mutex_unlock(&drm_global_mutex); return 0; err_undo: atomic_dec(&dev->open_count); if (drm_dev_needs_global_mutex(dev)) mutex_unlock(&drm_global_mutex); drm_minor_release(minor); return retcode; } EXPORT_SYMBOL(drm_open); static void drm_lastclose(struct drm_device *dev) { drm_client_dev_restore(dev, false); if (dev_is_pci(dev->dev)) vga_switcheroo_process_delayed_switch(); } /** * drm_release - release method for DRM file * @inode: device inode * @filp: file pointer. * * This function must be used by drivers as their &file_operations.release * method. It frees any resources associated with the open file. If this * is the last open file for the DRM device, it also restores the active * in-kernel DRM client. * * RETURNS: * Always succeeds and returns 0. */ int drm_release(struct inode *inode, struct file *filp) { struct drm_file *file_priv = filp->private_data; struct drm_minor *minor = file_priv->minor; struct drm_device *dev = minor->dev; if (drm_dev_needs_global_mutex(dev)) mutex_lock(&drm_global_mutex); drm_dbg_core(dev, "open_count = %d\n", atomic_read(&dev->open_count)); drm_close_helper(filp); if (atomic_dec_and_test(&dev->open_count)) drm_lastclose(dev); if (drm_dev_needs_global_mutex(dev)) mutex_unlock(&drm_global_mutex); drm_minor_release(minor); return 0; } EXPORT_SYMBOL(drm_release); void drm_file_update_pid(struct drm_file *filp) { struct drm_device *dev; struct pid *pid, *old; /* * Master nodes need to keep the original ownership in order for * drm_master_check_perm to keep working correctly. (See comment in * drm_auth.c.) */ if (filp->was_master) return; pid = task_tgid(current); /* * Quick unlocked check since the model is a single handover followed by * exclusive repeated use. */ if (pid == rcu_access_pointer(filp->pid)) return; dev = filp->minor->dev; mutex_lock(&dev->filelist_mutex); get_pid(pid); old = rcu_replace_pointer(filp->pid, pid, 1); mutex_unlock(&dev->filelist_mutex); synchronize_rcu(); put_pid(old); } /** * drm_release_noglobal - release method for DRM file * @inode: device inode * @filp: file pointer. * * This function may be used by drivers as their &file_operations.release * method. It frees any resources associated with the open file prior to taking * the drm_global_mutex. If this is the last open file for the DRM device, it * then restores the active in-kernel DRM client. * * RETURNS: * Always succeeds and returns 0. */ int drm_release_noglobal(struct inode *inode, struct file *filp) { struct drm_file *file_priv = filp->private_data; struct drm_minor *minor = file_priv->minor;