- 根目录:
- drivers
- gpu
- drm
- drm_stub.c
/**
* \file drm_stub.h
* Stub support
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
*/
/*
* Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
*
* Copyright 2001 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
* PRECISION INSIGHT 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/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/drm_core.h>
unsigned int drm_debug = 0; /* 1 to enable debug output */
EXPORT_SYMBOL(drm_debug);
unsigned int drm_rnodes = 0; /* 1 to enable experimental render nodes API */
EXPORT_SYMBOL(drm_rnodes);
unsigned int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
EXPORT_SYMBOL(drm_vblank_offdelay);
unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
EXPORT_SYMBOL(drm_timestamp_precision);
/*
* Default to use monotonic timestamps for wait-for-vblank and page-flip
* complete events.
*/
unsigned int drm_timestamp_monotonic = 1;
MODULE_AUTHOR(CORE_AUTHOR);
MODULE_DESCRIPTION(CORE_DESC);
MODULE_LICENSE("GPL and additional rights");
MODULE_PARM_DESC(debug, "Enable debug output");
MODULE_PARM_DESC(rnodes, "Enable experimental render nodes API");
MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
module_param_named(debug, drm_debug, int, 0600);
module_param_named(rnodes, drm_rnodes, int, 0600);
module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
struct idr drm_minors_idr;
struct class *drm_class;
struct dentry *drm_debugfs_root;
int drm_err(const char *func, const char *format, ...)
{
struct va_format vaf;
va_list args;
int r;
va_start(args, format);
vaf.fmt = format;
vaf.va = &args;
r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf);
va_end(args);
return r;
}
EXPORT_SYMBOL(drm_err);
void drm_ut_debug_printk(unsigned int request_level,
const char *prefix,
const char *function_name,
const char *format, ...)
{
struct va_format vaf;
va_list args;
if (drm_debug & request_level) {
va_start(args, format);
vaf.fmt = format;
vaf.va = &args;
if (function_name)
printk(KERN_DEBUG "[%s:%s], %pV", prefix,
function_name, &vaf);
else
printk(KERN_DEBUG "%pV", &vaf);
va_end(args);
}
}
EXPORT_SYMBOL(drm_ut_debug_printk);
static int drm_minor_get_id(struct drm_device *dev, int type)
{
int ret;
int base = 0, limit = 63;
if (type == DRM_MINOR_CONTROL) {
base += 64;
limit = base + 63;
} else if (type == DRM_MINOR_RENDER) {
base += 128;
limit = base + 63;
}
mutex_lock(&dev->struct_mutex);
ret = idr_alloc(&drm_minors_idr, NULL, base, limit, GFP_KERNEL);
mutex_unlock(&dev->struct_mutex);
return ret == -ENOSPC ? -EINVAL : ret;
}
struct drm_master *drm_master_create(struct drm_minor *minor)
{
struct drm_master *master;
master = kzalloc(sizeof(*master), GFP_KERNEL);
if (!master)
return NULL;
kref_init(&master->refcount);
spin_lock_init(&master->lock.spinlock);
init_waitqueue_head(&master->lock.lock_queue);
drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
INIT_LIST_HEAD(&master->magicfree);
master->minor = minor;
list_add_tail(&master->head, &minor->master_list);
return master;
}
struct drm_master *drm_master_get(struct drm_master *master)
{
kref_get(&master->refcount);
return master;
}
EXPORT_SYMBOL(drm_master_get);
static void drm_master_destroy(struct kref *kref)
{
struct drm_master *master = container_of(kref, struct drm_master, refcount);
struct drm_magic_entry *pt, *next;
struct drm_device *dev = master->minor->dev;
struct drm_map_list *r_list, *list_temp;
list_del(&master->head);
if (dev->driver->master_destroy)
dev->driver->master_destroy(dev, master);
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
if (r_list->master == master) {
drm_rmmap_locked(dev, r_list->map);
r_list = NULL;
}
}
if (master->unique) {
kfree(master->unique);
master->unique = NULL;
master->unique_len = 0;
}
kfree(dev->devname);
dev->devname = NULL;
list_for_each_entry_safe(pt, next, &master->magicfree, head) {
list_del(&pt->head);
drm_ht_remove_item(&master->magiclist, &pt->hash_item);
kfree(pt);
}
drm_ht_remove(&master->magiclist);
kfree(master);
}
void drm_master_put(struct drm_master **master)
{
kref_put(&(*master)->refcount, drm_master_destroy);
*master = NULL;
}
EXPORT_SYMBOL(drm_master_put);
int drm_setmaster_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
int ret = 0;
if (file_priv->is_master)
return 0;
if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
return -EINVAL;
if (!file_priv->master)
return -EINVAL;
if (file_priv->minor->master)
return -EINVAL;
mutex_lock(&dev->struct_mutex);
file_priv->minor->master = drm_master_get(file_priv->master);
file_priv->is_master = 1;
if (dev->driver->master_set) {
ret = dev->driver->master_set(dev, file_priv, false);
if (unlikely(ret != 0)) {
file_priv->is_master = 0;
drm_master_put(&file_priv->minor->master);
}
}
mutex_unlock(&dev->struct_mutex);
return ret;
}
int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
if (!file_priv->is_master)
return -EINVAL;
if (!file_priv->minor->master)
return -EINVAL;
mutex_lock(&dev->struct_mutex);
if (dev->driver->master_drop)
dev->driver->master_drop(dev, file_priv, false);
drm_master_put(&file_priv->minor->master);
file_priv->is_master = 0;
mutex_unlock(&dev->struct_mutex);
return 0;
}
/**
* drm_get_minor - Allocate and register new DRM minor
* @dev: DRM device
* @minor: Pointer to where new minor is stored
* @type: Type of minor
*
* Allocate a new minor of the given type and register it. A pointer to the new
* minor is returned in @minor.
* Caller must hold the global DRM mutex.
*
* RETURNS:
* 0 on success, negative error code on failure.
*/
static int drm_get_minor(struct drm_device *dev, struct drm_minor **minor,
int type)
{
struct drm_minor *new_minor;
int ret;
int minor_id;
DRM_DEBUG("\n");
minor_id = drm_minor_get_id(dev, type);
if (minor_id < 0)
return minor_id;
new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
if (!new_minor) {
ret = -ENOMEM;
goto err_idr;
}
new_minor->type = type;
new_minor->device = MKDEV(DRM_MAJOR, minor_id);
new_minor->dev = dev;
new_minor->index = minor_id;
INIT_LIST_HEAD(&new_minor->master_list);
idr_replace(&drm_minors_idr, new_minor, minor_id);
#if defined(CONFIG_DEBUG_FS)
ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
if (ret) {
DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
goto err_mem;
}
#endif
ret = drm_sysfs_device_add(new_minor);
if (ret) {
printk(KERN_ERR
"DRM: Error sysfs_device_add.\n");
goto err_debugfs;
}
*minor = new_minor;
DRM_DEBUG("new minor assigned %d\n", minor_id);
return 0;
err_debugfs:
#if defined(CONFIG_DEBUG_FS)
drm_debugfs_cleanup(new_minor);
err_mem:
#endif
kfree(new_minor);
err_idr:
idr_remove(&drm_minors_idr, minor_id);
*minor = NULL;
return ret;
}
/**
* drm_unplug_minor - Unplug DRM minor
* @minor: Minor to unplug
*
* Unplugs the given DRM minor but keeps the object. So after this returns,
* minor->dev is still valid so existing open-files can still access it to get
* device information from their drm_file ojects.
* If the minor is already unplugged or if @minor is NULL, nothing is done.
* The global DRM mutex must be held by the caller.
*/
static void drm_unplug_minor(struct drm_minor *minor)
{
if (!minor || !minor->kdev)
return;
#if defined(CONFIG_DEBUG_FS)
drm_debugfs_cleanup(minor);
#endif
drm_sysfs_device_remove(minor);
idr_remove(&drm_minors_idr, minor->index);
}
/**
* drm_put_minor - Destroy DRM minor
* @minor: Minor to destroy
*
* This calls drm_unplug_minor() on the given minor and then frees it. Nothing
* is done if @minor is NULL. It is fine to call this on already unplugged
* minors.
* The global DRM mutex must be held by the caller.
*/
static void drm_put_minor(struct drm_minor *minor)
{
if (!minor)
return;
DRM_DEBUG("release secondary minor %d\n", minor->index);
drm_unplug_minor(minor);
kfree(minor);
}
/**
* Called via drm_exit() at module unload time or when pci device is
* unplugged.
*
* Cleans up all DRM device, calling drm_lastclose().
*
*/
void drm_put_dev(struct drm_device *dev)
{
DRM_DEBUG("\n");
if (!dev) {
DRM_ERROR("cleanup called no dev\n");
return;
}
drm_dev_unregister(dev);
drm_dev_free(dev);
}
EXPORT_SYMBOL(drm_put_dev);
void drm_unplug_dev(struct drm_device *dev)
{
/* for a USB device */
if (drm_core_check_feature(dev, DRIVER_MODESET))
drm_unplug_minor(dev->control);
if (dev->render)
drm_unplug_minor(dev->render);
drm_unplug_minor(dev->primary);
mutex_lock(&drm_global_mutex);
drm_device_set_unplugged(dev);
if (dev->open_count == 0) {
drm_put_dev(dev);
}
mutex_unlock(&drm_global_mutex);
}
EXPORT_SYMBOL(drm_unplug_dev);
/**
* drm_dev_alloc - Allocate new drm device
* @driver: DRM driver to allocate device for
* : Parent device object
*
* Allocate and initialize a new DRM device. No device registration is done.
* Call drm_dev_register() to advertice the device to user space and register it
* with other core subsystems.
*
* RETURNS:
* Pointer to new DRM device, or NULL if out of memory.
*/
struct drm_device *drm_dev_alloc(struct drm_driver *driver,
struct device *parent)
{
struct drm_device *dev;
int ret;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
dev->dev = parent;
dev->driver = driver;
INIT_LIST_HEAD(&dev->filelist);
INIT_LIST_HEAD(&dev->ctxlist);
INIT_LIST_HEAD(&dev->vmalist);
INIT_LIST_HEAD(&dev->maplist);
INIT_LIST_HEAD(&dev->vblank_event_list);
spin_lock_init(&dev->count_lock);
spin_lock_init(&dev->event_lock);
mutex_init(&dev->struct_mutex);
mutex_init(&dev->ctxlist_mutex);
if (drm_ht_create(&dev->map_hash, 12))
goto err_free;
ret = drm_ctxbitmap_init(dev);
if (ret) {
DRM_ERROR("Cannot allocate memory for context bitmap.\n");
goto err_ht;
}
if (driver->driver_features & DRIVER_GEM) {
ret = drm_gem_init(dev);
if (ret) {
DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
goto err_ctxbitmap;
}
}
return dev;
err_ctxbitmap:
drm_ctxbitmap_cleanup(dev);
err_ht:
drm_ht_remove(&dev->map_hash);
err_free:
kfree(dev);
return NULL;
}
EXPORT_SYMBOL(drm_dev_alloc);
/**
* drm_dev_free - Free DRM device
* @dev: DRM device to free
*
* Free a DRM device that has previously been allocated via drm_dev_alloc().
* You must not use kfree() instead or you will leak memory.
*
* This must not be called once the device got registered. Use drm_put_dev()
* instead, which then calls drm_dev_free().
*/
void drm_dev_free(struct drm_device *dev)
{
drm_put_minor(dev->control);
drm_put_minor(dev->render);
drm_put_minor(dev->primary);
if (dev->driver->driver_features & DRIVER_GEM)
drm_gem_destroy(dev);
drm_ctxbitmap_cleanup(dev);
drm_ht_remove(&dev->map_hash);
kfree(dev->devname);
kfree(dev);
}
EXPORT_SYMBOL(drm_dev_free);
/**
* drm_dev_register - Register DRM device
* @dev: Device to register
*
* Register the DRM device @dev with the system, advertise device to user-space
* and start normal device operation. @dev must be allocated via drm_dev_alloc()
* previously.
*
* Never call this twice on any device!
*
* RETURNS:
* 0 on success, negative error code on failure.
*/
int drm_dev_register(struct drm_device *dev, unsigned long flags)
{
int ret;
mutex_lock(&drm_global_mutex);
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
if (ret)
goto out_unlock;
}
if (drm_core_check_feature(dev, DRIVER_RENDER) && drm_rnodes) {
ret = drm_get_minor(dev, &dev->render, DRM_MINOR_RENDER);
if (ret)
goto err_control_node;
}
ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
if (ret)
goto err_render_node;
if (dev->driver->load) {
ret = dev->driver->load(dev, flags);
if (ret)
goto err_primary_node;
}
/* setup grouping for legacy outputs */
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
ret = drm_mode_group_init_legacy_group(dev,
&dev->primary->mode_group);
if (ret)
goto err_unload;
}
ret = 0;
goto out_unlock;
err_unload:
if (dev->driver->unload)
dev->driver->unload(dev);
err_primary_node:
drm_unplug_minor(dev->primary);
err_render_node:
drm_unplug_minor(dev->render);
err_control_node:
drm_unplug_minor(dev->control);
out_unlock:
mutex_unlock(&drm_global_mutex);
return ret;
}
EXPORT_SYMBOL(drm_dev_register);
/**
* drm_dev_unregister - Unregister DRM device
* @dev: Device to unregister
*
* Unregister the DRM device from the system. This does the reverse of
* drm_dev_register() but does not deallocate the device. The caller must call
* drm_dev_free() to free all resources.
*/
void drm_dev_unregister(struct drm_device *dev)
{
struct drm_map_list *r_list, *list_temp;
drm_lastclose(dev);
if (dev->driver->unload)
dev->driver->unload(dev);
if (dev->agp)
drm_pci_agp_destroy(dev);
drm_vblank_cleanup(dev);
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
drm_rmmap(dev, r_list->map);
drm_unplug_minor(dev->control);
drm_unplug_minor(dev->render);
drm_unplug_minor(dev->primary);
}
EXPORT_SYMBOL(drm_dev_unregister);