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sys/dev/drm/core/drm_file.c
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/* | |||||
* \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/dma-fence.h> | |||||
#include <linux/module.h> | |||||
#include <linux/pci.h> | |||||
#include <linux/poll.h> | |||||
#include <linux/slab.h> | |||||
#include <drm/drm_client.h> | |||||
#include <drm/drm_drv.h> | |||||
#include <drm/drm_file.h> | |||||
#include <drm/drm_print.h> | |||||
#include "drm_crtc_internal.h" | |||||
#include "drm_internal.h" | |||||
#include "drm_legacy.h" | |||||
/* from BKL pushdown */ | |||||
DEFINE_MUTEX(drm_global_mutex); | |||||
/** | |||||
* 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. Legacy drivers will use the deprecated drm_legacy_mmap() | |||||
* function, modern drivers should use one of the provided memory-manager | |||||
* specific implementations. For GEM-based drivers this is drm_gem_mmap(), and | |||||
* for drivers which use the CMA GEM helpers it's drm_gem_cma_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, | |||||
* .llseek = no_llseek, | |||||
* .mmap = drm_gem_mmap, | |||||
* }; | |||||
* | |||||
* For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for | |||||
* CMA based drivers there is the DEFINE_DRM_GEM_CMA_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) | |||||
{ | |||||
struct drm_device *dev = minor->dev; | |||||
struct drm_file *file; | |||||
int ret; | |||||
file = kzalloc(sizeof(*file), GFP_KERNEL); | |||||
if (!file) | |||||
return ERR_PTR(-ENOMEM); | |||||
file->pid = get_pid(task_pid(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 */ | |||||
mutex_init(&file->event_read_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); | |||||
if (drm_core_check_feature(dev, DRIVER_PRIME)) | |||||
drm_prime_init_file_private(&file->prime); | |||||
if (dev->driver->open) { | |||||
ret = dev->driver->open(dev, file); | |||||
if (ret < 0) | |||||
goto out_prime_destroy; | |||||
} | |||||
return file; | |||||
out_prime_destroy: | |||||
if (drm_core_check_feature(dev, DRIVER_PRIME)) | |||||
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); | |||||
put_pid(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. | |||||
* | |||||
* RETURNS: | |||||
* 0 on success, or error code on failure. | |||||
*/ | |||||
void drm_file_free(struct drm_file *file) | |||||
{ | |||||
struct drm_device *dev; | |||||
if (!file) | |||||
return; | |||||
dev = file->minor->dev; | |||||
#ifdef __linux__ | |||||
DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", | |||||
task_pid_nr(current), | |||||
(long)old_encode_dev(file->minor->kdev->devt), | |||||
dev->open_count); | |||||
#endif | |||||
if (drm_core_check_feature(dev, DRIVER_LEGACY) && | |||||
dev->driver->preclose) | |||||
dev->driver->preclose(dev, file); | |||||
if (drm_core_check_feature(dev, DRIVER_LEGACY)) | |||||
drm_legacy_lock_release(dev, file->filp); | |||||
if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) | |||||
drm_legacy_reclaim_buffers(dev, 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); | |||||
drm_legacy_ctxbitmap_flush(dev, file); | |||||
if (drm_is_primary_client(file)) | |||||
drm_master_release(file); | |||||
if (dev->driver->postclose) | |||||
dev->driver->postclose(dev, file); | |||||
if (drm_core_check_feature(dev, DRIVER_PRIME)) | |||||
drm_prime_destroy_file_private(&file->prime); | |||||
WARN_ON(!list_empty(&file->event_list)); | |||||
put_pid(file->pid); | |||||
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 /dev/drm. | |||||
* | |||||
* \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. | |||||
*/ | |||||
static 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; | |||||
DRM_DEBUG("pid = %d, minor = %d\n", 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; | |||||
#ifdef __linux__ | |||||
filp->f_mode |= FMODE_UNSIGNED_OFFSET; | |||||
#endif | |||||
priv->filp = filp; | |||||
mutex_lock(&dev->filelist_mutex); | |||||
list_add(&priv->lhead, &dev->filelist); | |||||
mutex_unlock(&dev->filelist_mutex); | |||||
#ifdef __alpha__ | |||||
/* | |||||
* Default the hose | |||||
*/ | |||||
if (!dev->hose) { | |||||
struct pci_dev *pci_dev; | |||||
pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |||||
if (pci_dev) { | |||||
dev->hose = pci_dev->sysdata; | |||||
pci_dev_put(pci_dev); | |||||
} | |||||
if (!dev->hose) { | |||||
struct pci_bus *b = list_entry(pci_root_buses.next, | |||||
struct pci_bus, node); | |||||
if (b) | |||||
dev->hose = b->sysdata; | |||||
} | |||||
} | |||||
#endif | |||||
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 falure. | |||||
*/ | |||||
int drm_open(struct inode *inode, struct file *filp) | |||||
{ | |||||
struct drm_device *dev; | |||||
struct drm_minor *minor; | |||||
int retcode; | |||||
int need_setup = 0; | |||||
minor = drm_minor_acquire(iminor(inode)); | |||||
if (IS_ERR(minor)) | |||||
return PTR_ERR(minor); | |||||
dev = minor->dev; | |||||
if (!dev->open_count++) | |||||
need_setup = 1; | |||||
/* share address_space across all char-devs of a single device */ | |||||
#ifdef __linux__ | |||||
filp->f_mapping = dev->anon_inode->i_mapping; | |||||
#endif | |||||
retcode = drm_open_helper(filp, minor); | |||||
if (retcode) | |||||
goto err_undo; | |||||
if (need_setup) { | |||||
retcode = drm_legacy_setup(dev); | |||||
if (retcode) { | |||||
drm_close_helper(filp); | |||||
goto err_undo; | |||||
} | |||||
} | |||||
return 0; | |||||
err_undo: | |||||
dev->open_count--; | |||||
drm_minor_release(minor); | |||||
return retcode; | |||||
} | |||||
EXPORT_SYMBOL(drm_open); | |||||
void drm_lastclose(struct drm_device * dev) | |||||
{ | |||||
DRM_DEBUG("\n"); | |||||
if (dev->driver->lastclose) | |||||
dev->driver->lastclose(dev); | |||||
DRM_DEBUG("driver lastclose completed\n"); | |||||
if (drm_core_check_feature(dev, DRIVER_LEGACY)) | |||||
drm_legacy_dev_reinit(dev); | |||||
drm_client_dev_restore(dev); | |||||
} | |||||
/** | |||||
* 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, and calls the | |||||
* &drm_driver.postclose driver callback. If this is the last open file for the | |||||
* DRM device also proceeds to call the &drm_driver.lastclose driver callback. | |||||
* | |||||
* 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; | |||||
mutex_lock(&drm_global_mutex); | |||||
DRM_DEBUG("open_count = %d\n", dev->open_count); | |||||
drm_close_helper(filp); | |||||
if (!--dev->open_count) | |||||
drm_lastclose(dev); | |||||
mutex_unlock(&drm_global_mutex); | |||||
drm_minor_release(minor); | |||||
return 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_release); | |||||
/** | |||||
* drm_read - read method for DRM file | |||||
* @filp: file pointer | |||||
* @buffer: userspace destination pointer for the read | |||||
* @count: count in bytes to read | |||||
* @offset: offset to read | |||||
* | |||||
* This function must be used by drivers as their &file_operations.read | |||||
* method iff they use DRM events for asynchronous signalling to userspace. | |||||
* Since events are used by the KMS API for vblank and page flip completion this | |||||
* means all modern display drivers must use it. | |||||
* | |||||
* @offset is ignored, DRM events are read like a pipe. Therefore drivers also | |||||
* must set the &file_operation.llseek to no_llseek(). Polling support is | |||||
* provided by drm_poll(). | |||||
* | |||||
* This function will only ever read a full event. Therefore userspace must | |||||
* supply a big enough buffer to fit any event to ensure forward progress. Since | |||||
* the maximum event space is currently 4K it's recommended to just use that for | |||||
* safety. | |||||
* | |||||
* RETURNS: | |||||
* | |||||
* Number of bytes read (always aligned to full events, and can be 0) or a | |||||
* negative error code on failure. | |||||
*/ | |||||
ssize_t drm_read(struct file *filp, char __user *buffer, | |||||
size_t count, loff_t *offset) | |||||
{ | |||||
struct drm_file *file_priv = filp->private_data; | |||||
struct drm_device *dev = file_priv->minor->dev; | |||||
ssize_t ret; | |||||
if (!access_ok(buffer, count)) | |||||
return -EFAULT; | |||||
ret = mutex_lock_interruptible(&file_priv->event_read_lock); | |||||
if (ret) | |||||
return ret; | |||||
for (;;) { | |||||
struct drm_pending_event *e = NULL; | |||||
spin_lock_irq(&dev->event_lock); | |||||
if (!list_empty(&file_priv->event_list)) { | |||||
e = list_first_entry(&file_priv->event_list, | |||||
struct drm_pending_event, link); | |||||
file_priv->event_space += e->event->length; | |||||
list_del(&e->link); | |||||
} | |||||
spin_unlock_irq(&dev->event_lock); | |||||
if (e == NULL) { | |||||
if (ret) | |||||
break; | |||||
if (filp->f_flags & O_NONBLOCK) { | |||||
ret = -EAGAIN; | |||||
break; | |||||
} | |||||
mutex_unlock(&file_priv->event_read_lock); | |||||
ret = wait_event_interruptible(file_priv->event_wait, | |||||
!list_empty(&file_priv->event_list)); | |||||
if (ret >= 0) | |||||
ret = mutex_lock_interruptible(&file_priv->event_read_lock); | |||||
if (ret) | |||||
return ret; | |||||
} else { | |||||
unsigned length = e->event->length; | |||||
if (length > count - ret) { | |||||
put_back_event: | |||||
spin_lock_irq(&dev->event_lock); | |||||
file_priv->event_space -= length; | |||||
list_add(&e->link, &file_priv->event_list); | |||||
spin_unlock_irq(&dev->event_lock); | |||||
wake_up_interruptible(&file_priv->event_wait); | |||||
break; | |||||
} | |||||
if (copy_to_user(buffer + ret, e->event, length)) { | |||||
if (ret == 0) | |||||
ret = -EFAULT; | |||||
goto put_back_event; | |||||
} | |||||
ret += length; | |||||
kfree(e); | |||||
} | |||||
} | |||||
mutex_unlock(&file_priv->event_read_lock); | |||||
return ret; | |||||
} | |||||
EXPORT_SYMBOL(drm_read); | |||||
/** | |||||
* drm_poll - poll method for DRM file | |||||
* @filp: file pointer | |||||
* @wait: poll waiter table | |||||
* | |||||
* This function must be used by drivers as their &file_operations.read method | |||||
* iff they use DRM events for asynchronous signalling to userspace. Since | |||||
* events are used by the KMS API for vblank and page flip completion this means | |||||
* all modern display drivers must use it. | |||||
* | |||||
* See also drm_read(). | |||||
* | |||||
* RETURNS: | |||||
* | |||||
* Mask of POLL flags indicating the current status of the file. | |||||
*/ | |||||
__poll_t drm_poll(struct file *filp, struct poll_table_struct *wait) | |||||
{ | |||||
#ifdef __linux__ | |||||
struct drm_file *file_priv = filp->private_data; | |||||
__poll_t mask = 0; | |||||
poll_wait(filp, &file_priv->event_wait, wait); | |||||
if (!list_empty(&file_priv->event_list)) | |||||
mask |= EPOLLIN | EPOLLRDNORM; | |||||
return mask; | |||||
#elif defined(__FreeBSD__) | |||||
struct drm_file *file_priv; | |||||
struct drm_device *dev; | |||||
unsigned long irqflags; | |||||
int revents; | |||||
file_priv = filp->private_data; | |||||
dev = file_priv->minor->dev; | |||||
revents = 0; | |||||
spin_lock_irqsave(&dev->event_lock, irqflags); | |||||
if (list_empty(&file_priv->event_list)) | |||||
selrecord(curthread, &file_priv->event_poll); | |||||
else | |||||
revents = POLLIN | POLLRDNORM; | |||||
spin_unlock_irqrestore(&dev->event_lock, irqflags); | |||||
return (revents); | |||||
#endif | |||||
} | |||||
EXPORT_SYMBOL(drm_poll); | |||||
/** | |||||
* drm_event_reserve_init_locked - init a DRM event and reserve space for it | |||||
* @dev: DRM device | |||||
* @file_priv: DRM file private data | |||||
* @p: tracking structure for the pending event | |||||
* @e: actual event data to deliver to userspace | |||||
* | |||||
* This function prepares the passed in event for eventual delivery. If the event | |||||
* doesn't get delivered (because the IOCTL fails later on, before queuing up | |||||
* anything) then the even must be cancelled and freed using | |||||
* drm_event_cancel_free(). Successfully initialized events should be sent out | |||||
* using drm_send_event() or drm_send_event_locked() to signal completion of the | |||||
* asynchronous event to userspace. | |||||
* | |||||
* If callers embedded @p into a larger structure it must be allocated with | |||||
* kmalloc and @p must be the first member element. | |||||
* | |||||
* This is the locked version of drm_event_reserve_init() for callers which | |||||
* already hold &drm_device.event_lock. | |||||
* | |||||
* RETURNS: | |||||
* | |||||
* 0 on success or a negative error code on failure. | |||||
*/ | |||||
int drm_event_reserve_init_locked(struct drm_device *dev, | |||||
struct drm_file *file_priv, | |||||
struct drm_pending_event *p, | |||||
struct drm_event *e) | |||||
{ | |||||
if (file_priv->event_space < e->length) | |||||
return -ENOMEM; | |||||
file_priv->event_space -= e->length; | |||||
p->event = e; | |||||
list_add(&p->pending_link, &file_priv->pending_event_list); | |||||
p->file_priv = file_priv; | |||||
return 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_event_reserve_init_locked); | |||||
/** | |||||
* drm_event_reserve_init - init a DRM event and reserve space for it | |||||
* @dev: DRM device | |||||
* @file_priv: DRM file private data | |||||
* @p: tracking structure for the pending event | |||||
* @e: actual event data to deliver to userspace | |||||
* | |||||
* This function prepares the passed in event for eventual delivery. If the event | |||||
* doesn't get delivered (because the IOCTL fails later on, before queuing up | |||||
* anything) then the even must be cancelled and freed using | |||||
* drm_event_cancel_free(). Successfully initialized events should be sent out | |||||
* using drm_send_event() or drm_send_event_locked() to signal completion of the | |||||
* asynchronous event to userspace. | |||||
* | |||||
* If callers embedded @p into a larger structure it must be allocated with | |||||
* kmalloc and @p must be the first member element. | |||||
* | |||||
* Callers which already hold &drm_device.event_lock should use | |||||
* drm_event_reserve_init_locked() instead. | |||||
* | |||||
* RETURNS: | |||||
* | |||||
* 0 on success or a negative error code on failure. | |||||
*/ | |||||
int drm_event_reserve_init(struct drm_device *dev, | |||||
struct drm_file *file_priv, | |||||
struct drm_pending_event *p, | |||||
struct drm_event *e) | |||||
{ | |||||
unsigned long flags; | |||||
int ret; | |||||
spin_lock_irqsave(&dev->event_lock, flags); | |||||
ret = drm_event_reserve_init_locked(dev, file_priv, p, e); | |||||
spin_unlock_irqrestore(&dev->event_lock, flags); | |||||
return ret; | |||||
} | |||||
EXPORT_SYMBOL(drm_event_reserve_init); | |||||
/** | |||||
* drm_event_cancel_free - free a DRM event and release its space | |||||
* @dev: DRM device | |||||
* @p: tracking structure for the pending event | |||||
* | |||||
* This function frees the event @p initialized with drm_event_reserve_init() | |||||
* and releases any allocated space. It is used to cancel an event when the | |||||
* nonblocking operation could not be submitted and needed to be aborted. | |||||
*/ | |||||
void drm_event_cancel_free(struct drm_device *dev, | |||||
struct drm_pending_event *p) | |||||
{ | |||||
unsigned long flags; | |||||
spin_lock_irqsave(&dev->event_lock, flags); | |||||
if (p->file_priv) { | |||||
p->file_priv->event_space += p->event->length; | |||||
list_del(&p->pending_link); | |||||
} | |||||
spin_unlock_irqrestore(&dev->event_lock, flags); | |||||
if (p->fence) | |||||
dma_fence_put(p->fence); | |||||
kfree(p); | |||||
} | |||||
EXPORT_SYMBOL(drm_event_cancel_free); | |||||
/** | |||||
* drm_send_event_locked - send DRM event to file descriptor | |||||
* @dev: DRM device | |||||
* @e: DRM event to deliver | |||||
* | |||||
* This function sends the event @e, initialized with drm_event_reserve_init(), | |||||
* to its associated userspace DRM file. Callers must already hold | |||||
* &drm_device.event_lock, see drm_send_event() for the unlocked version. | |||||
* | |||||
* Note that the core will take care of unlinking and disarming events when the | |||||
* corresponding DRM file is closed. Drivers need not worry about whether the | |||||
* DRM file for this event still exists and can call this function upon | |||||
* completion of the asynchronous work unconditionally. | |||||
*/ | |||||
void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e) | |||||
{ | |||||
assert_spin_locked(&dev->event_lock); | |||||
if (e->completion) { | |||||
complete_all(e->completion); | |||||
e->completion_release(e->completion); | |||||
e->completion = NULL; | |||||
} | |||||
if (e->fence) { | |||||
dma_fence_signal(e->fence); | |||||
dma_fence_put(e->fence); | |||||
} | |||||
if (!e->file_priv) { | |||||
kfree(e); | |||||
return; | |||||
} | |||||
list_del(&e->pending_link); | |||||
list_add_tail(&e->link, | |||||
&e->file_priv->event_list); | |||||
wake_up_interruptible(&e->file_priv->event_wait); | |||||
#ifdef __FreeBSD__ | |||||
selwakeup(&e->file_priv->event_poll); | |||||
#endif | |||||
} | |||||
EXPORT_SYMBOL(drm_send_event_locked); | |||||
/** | |||||
* drm_send_event - send DRM event to file descriptor | |||||
* @dev: DRM device | |||||
* @e: DRM event to deliver | |||||
* | |||||
* This function sends the event @e, initialized with drm_event_reserve_init(), | |||||
* to its associated userspace DRM file. This function acquires | |||||
* &drm_device.event_lock, see drm_send_event_locked() for callers which already | |||||
* hold this lock. | |||||
* | |||||
* Note that the core will take care of unlinking and disarming events when the | |||||
* corresponding DRM file is closed. Drivers need not worry about whether the | |||||
* DRM file for this event still exists and can call this function upon | |||||
* completion of the asynchronous work unconditionally. | |||||
*/ | |||||
void drm_send_event(struct drm_device *dev, struct drm_pending_event *e) | |||||
{ | |||||
unsigned long irqflags; | |||||
spin_lock_irqsave(&dev->event_lock, irqflags); | |||||
drm_send_event_locked(dev, e); | |||||
spin_unlock_irqrestore(&dev->event_lock, irqflags); | |||||
} | |||||
EXPORT_SYMBOL(drm_send_event); |