WebSVN – Kolibri OS – Diff – /drivers/video/drm/drm_gem.c


/*
 * Copyright © 2008 Intel Corporation
 *
 * 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
 * THE AUTHORS OR COPYRIGHT HOLDERS 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.
 *
 * Authors:
 *    Eric Anholt 
 *
 */
 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "drm_internal.h"
 
/** @file drm_gem.c
 *
 * This file provides some of the base ioctls and library routines for
 * the graphics memory manager implemented by each device driver.
 *
 * Because various devices have different requirements in terms of
 * synchronization and migration strategies, implementing that is left up to
 * the driver, and all that the general API provides should be generic --
 * allocating objects, reading/writing data with the cpu, freeing objects.
 * Even there, platform-dependent optimizations for reading/writing data with
 * the CPU mean we'll likely hook those out to driver-specific calls.  However,
 * the DRI2 implementation wants to have at least allocate/mmap be generic.
 *
 * The goal was to have swap-backed object allocation managed through
 * struct file.  However, file descriptors as handles to a struct file have
 * two major failings:
 * - Process limits prevent more than 1024 or so being used at a time by
 *   default.
 * - Inability to allocate high fds will aggravate the X Server's select()
 *   handling, and likely that of many GL client applications as well.
 *
 * This led to a plan of using our own integer IDs (called handles, following
 * DRM terminology) to mimic fds, and implement the fd syscalls we need as
 * ioctls.  The objects themselves will still include the struct file so
 * that we can transition to fds if the required kernel infrastructure shows
 * up at a later date, and as our interface with shmfs for memory allocation.
 */
 
/*
 * We make up offsets for buffer objects so we can recognize them at
 * mmap time.
 */
 
/* pgoff in mmap is an unsigned long, so we need to make sure that
 * the faked up offset will fit
 */
 
#if BITS_PER_LONG == 64
#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
#else
#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
#endif
 
/**
 * drm_gem_init - Initialize the GEM device fields
 * @dev: drm_devic structure to initialize
 */
int
drm_gem_init(struct drm_device *dev)
{
	struct drm_vma_offset_manager *vma_offset_manager;
 
	mutex_init(&dev->object_name_lock);
	idr_init(&dev->object_name_idr);
 
	vma_offset_manager = kzalloc(sizeof(*vma_offset_manager), GFP_KERNEL);
	if (!vma_offset_manager) {
		DRM_ERROR("out of memory\n");
		return -ENOMEM;
	}
 
	dev->vma_offset_manager = vma_offset_manager;
	drm_vma_offset_manager_init(vma_offset_manager,
				    DRM_FILE_PAGE_OFFSET_START,
				    DRM_FILE_PAGE_OFFSET_SIZE);
 
	return 0;
}
 
void
drm_gem_destroy(struct drm_device *dev)
{
 
	drm_vma_offset_manager_destroy(dev->vma_offset_manager);
	kfree(dev->vma_offset_manager);
	dev->vma_offset_manager = NULL;
}
 
/**
 * drm_gem_object_init - initialize an allocated shmem-backed GEM object
 * @dev: drm_device the object should be initialized for
 * @obj: drm_gem_object to initialize
 * @size: object size
 *
 * Initialize an already allocated GEM object of the specified size with
 * shmfs backing store.
 */
int drm_gem_object_init(struct drm_device *dev,
			struct drm_gem_object *obj, size_t size)
{
	struct file *filp;
 
	drm_gem_private_object_init(dev, obj, size);
 
	filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);
	if (IS_ERR(filp))
		return PTR_ERR(filp);
 
	obj->filp = filp;
 
	return 0;
}
EXPORT_SYMBOL(drm_gem_object_init);
 
/**
 * drm_gem_private_object_init - initialize an allocated private GEM object
 * @dev: drm_device the object should be initialized for
 * @obj: drm_gem_object to initialize
 * @size: object size
 *
 * Initialize an already allocated GEM object of the specified size with
 * no GEM provided backing store. Instead the caller is responsible for
 * backing the object and handling it.
 */
void drm_gem_private_object_init(struct drm_device *dev,
				 struct drm_gem_object *obj, size_t size)
{
	BUG_ON((size & (PAGE_SIZE - 1)) != 0);
 
	obj->dev = dev;
	obj->filp = NULL;
 
	kref_init(&obj->refcount);
	obj->handle_count = 0;
	obj->size = size;
	drm_vma_node_reset(&obj->vma_node);
}
EXPORT_SYMBOL(drm_gem_private_object_init);
 
static void
drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp)
{
	/*
	 * Note: obj->dma_buf can't disappear as long as we still hold a
	 * handle reference in obj->handle_count.
	 */
}
 
/**
 * drm_gem_object_handle_free - release resources bound to userspace handles
 * @obj: GEM object to clean up.
 *
 * Called after the last handle to the object has been closed
 *
 * Removes any name for the object. Note that this must be
 * called before drm_gem_object_free or we'll be touching
 * freed memory
 */
static void drm_gem_object_handle_free(struct drm_gem_object *obj)
{
	struct drm_device *dev = obj->dev;
 
	/* Remove any name for this object */
	if (obj->name) {
		idr_remove(&dev->object_name_idr, obj->name);
		obj->name = 0;
	}
}
 
 
static void
drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
{
	struct drm_device *dev = obj->dev;
	bool final = false;
 
	if (WARN_ON(obj->handle_count == 0))
		return;
 
	/*
	* Must bump handle count first as this may be the last
	* ref, in which case the object would disappear before we
	* checked for a name
	*/
 
	mutex_lock(&dev->object_name_lock);
	if (--obj->handle_count == 0) {
		drm_gem_object_handle_free(obj);
		final = true;
	}
	mutex_unlock(&dev->object_name_lock);
 
	if (final)
	drm_gem_object_unreference_unlocked(obj);
}
 
/*
 * Called at device or object close to release the file's
 * handle references on objects.
 */
static int
drm_gem_object_release_handle(int id, void *ptr, void *data)
{
	struct drm_file *file_priv = data;
	struct drm_gem_object *obj = ptr;
	struct drm_device *dev = obj->dev;
 
	if (drm_core_check_feature(dev, DRIVER_PRIME))
		drm_gem_remove_prime_handles(obj, file_priv);
//	drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
 
	if (dev->driver->gem_close_object)
		dev->driver->gem_close_object(obj, file_priv);
 
	drm_gem_object_handle_unreference_unlocked(obj);
 
	return 0;
}
 
/**
 * drm_gem_handle_delete - deletes the given file-private handle
 * @filp: drm file-private structure to use for the handle look up
 * @handle: userspace handle to delete
 *
 * Removes the GEM handle from the @filp lookup table which has been added with
 * drm_gem_handle_create(). If this is the last handle also cleans up linked
 * resources like GEM names.
 */
int
drm_gem_handle_delete(struct drm_file *filp, u32 handle)
{
	struct drm_device *dev;
	struct drm_gem_object *obj;
 
	/* This is gross. The idr system doesn't let us try a delete and
	 * return an error code.  It just spews if you fail at deleting.
	 * So, we have to grab a lock around finding the object and then
	 * doing the delete on it and dropping the refcount, or the user
	 * could race us to double-decrement the refcount and cause a
	 * use-after-free later.  Given the frequency of our handle lookups,
	 * we may want to use ida for number allocation and a hash table
	 * for the pointers, anyway.
	 */
	spin_lock(&filp->table_lock);
 
	/* Check if we currently have a reference on the object */
	obj = idr_find(&filp->object_idr, handle);
	if (obj == NULL) {
		spin_unlock(&filp->table_lock);
		return -EINVAL;
	}
	dev = obj->dev;
 
	/* Release reference and decrement refcount. */
	idr_remove(&filp->object_idr, handle);
	spin_unlock(&filp->table_lock);
 
 
 
 
 
 
	drm_gem_object_release_handle(handle, obj, filp);
	return 0;
}
EXPORT_SYMBOL(drm_gem_handle_delete);
 
/**
 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers
 * @file: drm file-private structure to remove the dumb handle from
 * @dev: corresponding drm_device
 * @handle: the dumb handle to remove
 *
 * This implements the ->dumb_destroy kms driver callback for drivers which use
 * gem to manage their backing storage.
 */
int drm_gem_dumb_destroy(struct drm_file *file,
			 struct drm_device *dev,
			 uint32_t handle)
{
	return drm_gem_handle_delete(file, handle);
}
EXPORT_SYMBOL(drm_gem_dumb_destroy);
 
/**
 * drm_gem_handle_create_tail - internal functions to create a handle
 * @file_priv: drm file-private structure to register the handle for
 * @obj: object to register
 * @handlep: pointer to return the created handle to the caller
 *
 * This expects the dev->object_name_lock to be held already and will drop it
 * before returning. Used to avoid races in establishing new handles when
 * importing an object from either an flink name or a dma-buf.
 *
 * Handles must be release again through drm_gem_handle_delete(). This is done
 * when userspace closes @file_priv for all attached handles, or through the
 * GEM_CLOSE ioctl for individual handles.
 */
int
drm_gem_handle_create_tail(struct drm_file *file_priv,
			   struct drm_gem_object *obj,
			   u32 *handlep)
{
	struct drm_device *dev = obj->dev;
	u32 handle;
	int ret;
 
	WARN_ON(!mutex_is_locked(&dev->object_name_lock));
	if (obj->handle_count++ == 0)
		drm_gem_object_reference(obj);
 
	/*
	 * Get the user-visible handle using idr.  Preload and perform
	 * allocation under our spinlock.
	 */
	idr_preload(GFP_KERNEL);
	spin_lock(&file_priv->table_lock);
 
	ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT);
 
 
 
	spin_unlock(&file_priv->table_lock);
	idr_preload_end();
 
	mutex_unlock(&dev->object_name_lock);
	if (ret < 0)
		goto err_unref;
 
	handle = ret;
 
//	ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp);
//	if (ret) {
//		drm_gem_handle_delete(file_priv, *handlep);
//		return ret;
//	}
 
	if (dev->driver->gem_open_object) {
		ret = dev->driver->gem_open_object(obj, file_priv);
		if (ret)
			goto err_revoke;
	}
 
	*handlep = handle;
	return 0;
 
err_revoke:
//	drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
err_remove:
	spin_lock(&file_priv->table_lock);
	idr_remove(&file_priv->object_idr, handle);
	spin_unlock(&file_priv->table_lock);
err_unref:
	drm_gem_object_handle_unreference_unlocked(obj);
	return ret;
}
 
/**
 * drm_gem_handle_create - create a gem handle for an object
 * @file_priv: drm file-private structure to register the handle for
 * @obj: object to register
 * @handlep: pionter to return the created handle to the caller
 *
 * Create a handle for this object. This adds a handle reference
 * to the object, which includes a regular reference count. Callers
 * will likely want to dereference the object afterwards.
 */
int drm_gem_handle_create(struct drm_file *file_priv,
			  struct drm_gem_object *obj,
			  u32 *handlep)
{
	mutex_lock(&obj->dev->object_name_lock);
 
	return drm_gem_handle_create_tail(file_priv, obj, handlep);
}
EXPORT_SYMBOL(drm_gem_handle_create);
 
#if 0
/**
 * drm_gem_free_mmap_offset - release a fake mmap offset for an object
 * @obj: obj in question
 *
 * This routine frees fake offsets allocated by drm_gem_create_mmap_offset().
 */
void
drm_gem_free_mmap_offset(struct drm_gem_object *obj)
{
	struct drm_device *dev = obj->dev;
 
	drm_vma_offset_remove(dev->vma_offset_manager, &obj->vma_node);
}
EXPORT_SYMBOL(drm_gem_free_mmap_offset);
 
/**
 * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object
 * @obj: obj in question
 * @size: the virtual size
 *
 * GEM memory mapping works by handing back to userspace a fake mmap offset
 * it can use in a subsequent mmap(2) call.  The DRM core code then looks
 * up the object based on the offset and sets up the various memory mapping
 * structures.
 *
 * This routine allocates and attaches a fake offset for @obj, in cases where
 * the virtual size differs from the physical size (ie. obj->size).  Otherwise
 * just use drm_gem_create_mmap_offset().
 */
int
drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size)
{
	struct drm_device *dev = obj->dev;
 
	return drm_vma_offset_add(dev->vma_offset_manager, &obj->vma_node,
				  size / PAGE_SIZE);
}
EXPORT_SYMBOL(drm_gem_create_mmap_offset_size);
 
/**
 * drm_gem_create_mmap_offset - create a fake mmap offset for an object
 * @obj: obj in question
 *
 * GEM memory mapping works by handing back to userspace a fake mmap offset
 * it can use in a subsequent mmap(2) call.  The DRM core code then looks
 * up the object based on the offset and sets up the various memory mapping
 * structures.
 *
 * This routine allocates and attaches a fake offset for @obj.
 */
int drm_gem_create_mmap_offset(struct drm_gem_object *obj)
{
	return drm_gem_create_mmap_offset_size(obj, obj->size);
}
EXPORT_SYMBOL(drm_gem_create_mmap_offset);
 
/**
 * drm_gem_get_pages - helper to allocate backing pages for a GEM object
 * from shmem
 * @obj: obj in question
 *
 * This reads the page-array of the shmem-backing storage of the given gem
 * object. An array of pages is returned. If a page is not allocated or
 * swapped-out, this will allocate/swap-in the required pages. Note that the
 * whole object is covered by the page-array and pinned in memory.
 *
 * Use drm_gem_put_pages() to release the array and unpin all pages.
 *
 * This uses the GFP-mask set on the shmem-mapping (see mapping_set_gfp_mask()).
 * If you require other GFP-masks, you have to do those allocations yourself.
 *
 * Note that you are not allowed to change gfp-zones during runtime. That is,
 * shmem_read_mapping_page_gfp() must be called with the same gfp_zone(gfp) as
 * set during initialization. If you have special zone constraints, set them
 * after drm_gem_init_object() via mapping_set_gfp_mask(). shmem-core takes care
 * to keep pages in the required zone during swap-in.
 */
struct page **drm_gem_get_pages(struct drm_gem_object *obj)
{
	struct address_space *mapping;
	struct page *p, **pages;
	int i, npages;
 
	/* This is the shared memory object that backs the GEM resource */
	mapping = file_inode(obj->filp)->i_mapping;
 
	/* We already BUG_ON() for non-page-aligned sizes in
	 * drm_gem_object_init(), so we should never hit this unless
	 * driver author is doing something really wrong:
	 */
	WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0);
 
	npages = obj->size >> PAGE_SHIFT;
 
	pages = drm_malloc_ab(npages, sizeof(struct page *));
	if (pages == NULL)
		return ERR_PTR(-ENOMEM);
 
	for (i = 0; i < npages; i++) {
		p = shmem_read_mapping_page(mapping, i);
		if (IS_ERR(p))
			goto fail;
		pages[i] = p;
 
		/* Make sure shmem keeps __GFP_DMA32 allocated pages in the
		 * correct region during swapin. Note that this requires
		 * __GFP_DMA32 to be set in mapping_gfp_mask(inode->i_mapping)
		 * so shmem can relocate pages during swapin if required.
		 */
		BUG_ON(mapping_gfp_constraint(mapping, __GFP_DMA32) &&
				(page_to_pfn(p) >= 0x00100000UL));
	}
 
	return pages;
 
fail:
	while (i--)
		page_cache_release(pages[i]);
 
	drm_free_large(pages);
	return ERR_CAST(p);
}
EXPORT_SYMBOL(drm_gem_get_pages);
 
/**
 * drm_gem_put_pages - helper to free backing pages for a GEM object
 * @obj: obj in question
 * @pages: pages to free
 * @dirty: if true, pages will be marked as dirty
 * @accessed: if true, the pages will be marked as accessed
 */
void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
		bool dirty, bool accessed)
{
	int i, npages;
 
	/* We already BUG_ON() for non-page-aligned sizes in
	 * drm_gem_object_init(), so we should never hit this unless
	 * driver author is doing something really wrong:
	 */
	WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0);
 
	npages = obj->size >> PAGE_SHIFT;
 
	for (i = 0; i < npages; i++) {
		if (dirty)
			set_page_dirty(pages[i]);
 
		if (accessed)
			mark_page_accessed(pages[i]);
 
		/* Undo the reference we took when populating the table */
		page_cache_release(pages[i]);
	}
 
	drm_free_large(pages);
}
EXPORT_SYMBOL(drm_gem_put_pages);
#endif
 
/**
 * drm_gem_object_lookup - look up a GEM object from it's handle
 * @dev: DRM device
 * @filp: DRM file private date
 * @handle: userspace handle
 *
 * Returns:
 *
 * A reference to the object named by the handle if such exists on @filp, NULL
 * otherwise.
 */
struct drm_gem_object *
drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp,
		      u32 handle)
{
	struct drm_gem_object *obj;
 
	spin_lock(&filp->table_lock);
 
	/* Check if we currently have a reference on the object */
	obj = idr_find(&filp->object_idr, handle);
	if (obj == NULL) {
		spin_unlock(&filp->table_lock);
		return NULL;
	}
 
	drm_gem_object_reference(obj);
 
	spin_unlock(&filp->table_lock);
 
	return obj;
}
EXPORT_SYMBOL(drm_gem_object_lookup);
 
/**
 * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl
 * @dev: drm_device
 * @data: ioctl data
 * @file_priv: drm file-private structure
 *
 * Releases the handle to an mm object.
 */
int
drm_gem_close_ioctl(struct drm_device *dev, void *data,
		    struct drm_file *file_priv)
{
	struct drm_gem_close *args = data;
	int ret;
 
	if (!drm_core_check_feature(dev, DRIVER_GEM))
		return -ENODEV;
 
	ret = drm_gem_handle_delete(file_priv, args->handle);
 
	return ret;
}
 
/**
 * drm_gem_flink_ioctl - implementation of the GEM_FLINK ioctl
 * @dev: drm_device
 * @data: ioctl data
 * @file_priv: drm file-private structure
 *
 * Create a global name for an object, returning the name.
 *
 * Note that the name does not hold a reference; when the object
 * is freed, the name goes away.
 */
int
drm_gem_flink_ioctl(struct drm_device *dev, void *data,
		    struct drm_file *file_priv)
{
	struct drm_gem_flink *args = data;
	struct drm_gem_object *obj;
	int ret;
 
	if (!drm_core_check_feature(dev, DRIVER_GEM))
		return -ENODEV;
 
	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	if (obj == NULL)
		return -ENOENT;
 
	mutex_lock(&dev->object_name_lock);
 
	/* prevent races with concurrent gem_close. */
	if (obj->handle_count == 0) {
		ret = -ENOENT;
		goto err;
	}
 
	if (!obj->name) {
		ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_KERNEL);
		if (ret < 0)
			goto err;
 
		obj->name = ret;
	}
 
	args->name = (uint64_t) obj->name;
	ret = 0;
 
err:
 
	mutex_unlock(&dev->object_name_lock);
	drm_gem_object_unreference_unlocked(obj);
 
//    printf("%s object %p name %d refcount %d\n",
//           __FUNCTION__, obj, obj->name, obj->refcount.refcount);
 
	return ret;
}
 
/**
 * drm_gem_open - implementation of the GEM_OPEN ioctl
 * @dev: drm_device
 * @data: ioctl data
 * @file_priv: drm file-private structure
 *
 * Open an object using the global name, returning a handle and the size.
 *
 * This handle (of course) holds a reference to the object, so the object
 * will not go away until the handle is deleted.
 */
int
drm_gem_open_ioctl(struct drm_device *dev, void *data,
		   struct drm_file *file_priv)
{
	struct drm_gem_open *args = data;
	struct drm_gem_object *obj;
	int ret;
	u32 handle;
 
	if (!drm_core_check_feature(dev, DRIVER_GEM))
		return -ENODEV;
 
	mutex_lock(&dev->object_name_lock);
	obj = idr_find(&dev->object_name_idr, (int) args->name);
	if (obj) {
		drm_gem_object_reference(obj);
	} else {
		mutex_unlock(&dev->object_name_lock);
		return -ENOENT;
	}
 
	/* drm_gem_handle_create_tail unlocks dev->object_name_lock. */
	ret = drm_gem_handle_create_tail(file_priv, obj, &handle);
	drm_gem_object_unreference_unlocked(obj);
	if (ret)
		return ret;
 
	args->handle = handle;
	args->size = obj->size;
 
//    printf("%s object %p handle %d refcount %d\n",
//           __FUNCTION__, obj, handle, obj->refcount.refcount);
 
	return 0;
}
 
#if 0
/**
 * gem_gem_open - initalizes GEM file-private structures at devnode open time
 * @dev: drm_device which is being opened by userspace
 * @file_private: drm file-private structure to set up
 *
 * Called at device open time, sets up the structure for handling refcounting
 * of mm objects.
 */
void
drm_gem_open(struct drm_device *dev, struct drm_file *file_private)
{
	idr_init(&file_private->object_idr);
	spin_lock_init(&file_private->table_lock);
}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
/**
 * drm_gem_release - release file-private GEM resources
 * @dev: drm_device which is being closed by userspace
 * @file_private: drm file-private structure to clean up
 *
 * Called at close time when the filp is going away.
 *
 * Releases any remaining references on objects by this filp.
 */
void
drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
{
	idr_for_each(&file_private->object_idr,
		     &drm_gem_object_release_handle, file_private);
	idr_destroy(&file_private->object_idr);
}
#endif
 
void
drm_gem_object_release(struct drm_gem_object *obj)
{
	WARN_ON(obj->dma_buf);
 
	if (obj->filp)
	    free(obj->filp);
}
EXPORT_SYMBOL(drm_gem_object_release);
 
/**
 * drm_gem_object_free - free a GEM object
 * @kref: kref of the object to free
 *
 * Called after the last reference to the object has been lost.
 * Must be called holding struct_ mutex
 *
 * Frees the object
 */
void
drm_gem_object_free(struct kref *kref)
{
	struct drm_gem_object *obj =
		container_of(kref, struct drm_gem_object, refcount);
	struct drm_device *dev = obj->dev;
 
	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 
	if (dev->driver->gem_free_object != NULL)
		dev->driver->gem_free_object(obj);
}
EXPORT_SYMBOL(drm_gem_object_free);
 
 
#if 0
void drm_gem_vm_open(struct vm_area_struct *vma)
{
	struct drm_gem_object *obj = vma->vm_private_data;
 
	drm_gem_object_reference(obj);
}
EXPORT_SYMBOL(drm_gem_vm_open);
 
void drm_gem_vm_close(struct vm_area_struct *vma)
{
	struct drm_gem_object *obj = vma->vm_private_data;
	struct drm_device *dev = obj->dev;
 
	mutex_lock(&dev->struct_mutex);
	drm_vm_close_locked(obj->dev, vma);
	drm_gem_object_unreference(obj);
	mutex_unlock(&dev->struct_mutex);
}
EXPORT_SYMBOL(drm_gem_vm_close);
 
#endif

Rev 6935	Rev 6937
1	/*	1	/*
2	* Copyright © 2008 Intel Corporation	2	* Copyright © 2008 Intel Corporation
3	*	3	*
4	* Permission is hereby granted, free of charge, to any person obtaining a	4	* Permission is hereby granted, free of charge, to any person obtaining a
5	* copy of this software and associated documentation files (the "Software"),	5	* copy of this software and associated documentation files (the "Software"),
6	* to deal in the Software without restriction, including without limitation	6	* to deal in the Software without restriction, including without limitation
7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
8	* and/or sell copies of the Software, and to permit persons to whom the	8	* and/or sell copies of the Software, and to permit persons to whom the
9	* Software is furnished to do so, subject to the following conditions:	9	* Software is furnished to do so, subject to the following conditions:
10	*	10	*
11	* The above copyright notice and this permission notice (including the next	11	* The above copyright notice and this permission notice (including the next
12	* paragraph) shall be included in all copies or substantial portions of the	12	* paragraph) shall be included in all copies or substantial portions of the
13	* Software.	13	* Software.
14	*	14	*
15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER	18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21	* IN THE SOFTWARE.	21	* IN THE SOFTWARE.
22	*	22	*
23	* Authors:	23	* Authors:
24	* Eric Anholt	24	* Eric Anholt
25	*	25	*
26	*/	26	*/
27		27
28	#include	28	#include
29	#include	29	#include
30	#include	30	#include
31	#include	31	#include
32	#include	32	#include
33	#include	33	#include
34	#include	34	#include
35	#include	35	#include
36	#include	36	#include
37	#include	37	#include
38	#include	38	#include
39	#include	39	#include
40	#include "drm_internal.h"	40	#include "drm_internal.h"
41		41
42	/** @file drm_gem.c	42	/** @file drm_gem.c
43	*	43	*
44	* This file provides some of the base ioctls and library routines for	44	* This file provides some of the base ioctls and library routines for
45	* the graphics memory manager implemented by each device driver.	45	* the graphics memory manager implemented by each device driver.
46	*	46	*
47	* Because various devices have different requirements in terms of	47	* Because various devices have different requirements in terms of
48	* synchronization and migration strategies, implementing that is left up to	48	* synchronization and migration strategies, implementing that is left up to
49	* the driver, and all that the general API provides should be generic --	49	* the driver, and all that the general API provides should be generic --
50	* allocating objects, reading/writing data with the cpu, freeing objects.	50	* allocating objects, reading/writing data with the cpu, freeing objects.
51	* Even there, platform-dependent optimizations for reading/writing data with	51	* Even there, platform-dependent optimizations for reading/writing data with
52	* the CPU mean we'll likely hook those out to driver-specific calls. However,	52	* the CPU mean we'll likely hook those out to driver-specific calls. However,
53	* the DRI2 implementation wants to have at least allocate/mmap be generic.	53	* the DRI2 implementation wants to have at least allocate/mmap be generic.
54	*	54	*
55	* The goal was to have swap-backed object allocation managed through	55	* The goal was to have swap-backed object allocation managed through
56	* struct file. However, file descriptors as handles to a struct file have	56	* struct file. However, file descriptors as handles to a struct file have
57	* two major failings:	57	* two major failings:
58	* - Process limits prevent more than 1024 or so being used at a time by	58	* - Process limits prevent more than 1024 or so being used at a time by
59	* default.	59	* default.
60	* - Inability to allocate high fds will aggravate the X Server's select()	60	* - Inability to allocate high fds will aggravate the X Server's select()
61	* handling, and likely that of many GL client applications as well.	61	* handling, and likely that of many GL client applications as well.
62	*	62	*
63	* This led to a plan of using our own integer IDs (called handles, following	63	* This led to a plan of using our own integer IDs (called handles, following
64	* DRM terminology) to mimic fds, and implement the fd syscalls we need as	64	* DRM terminology) to mimic fds, and implement the fd syscalls we need as
65	* ioctls. The objects themselves will still include the struct file so	65	* ioctls. The objects themselves will still include the struct file so
66	* that we can transition to fds if the required kernel infrastructure shows	66	* that we can transition to fds if the required kernel infrastructure shows
67	* up at a later date, and as our interface with shmfs for memory allocation.	67	* up at a later date, and as our interface with shmfs for memory allocation.
68	*/	68	*/
69		69
70	/*	70	/*
71	* We make up offsets for buffer objects so we can recognize them at	71	* We make up offsets for buffer objects so we can recognize them at
72	* mmap time.	72	* mmap time.
73	*/	73	*/
74		74
75	/* pgoff in mmap is an unsigned long, so we need to make sure that	75	/* pgoff in mmap is an unsigned long, so we need to make sure that
76	* the faked up offset will fit	76	* the faked up offset will fit
77	*/	77	*/
78		78
79	#if BITS_PER_LONG == 64	79	#if BITS_PER_LONG == 64
80	#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)	80	#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
81	#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)	81	#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
82	#else	82	#else
83	#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)	83	#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
84	#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)	84	#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
85	#endif	85	#endif
86		86
87	/**	87	/**
88	* drm_gem_init - Initialize the GEM device fields	88	* drm_gem_init - Initialize the GEM device fields
89	* @dev: drm_devic structure to initialize	89	* @dev: drm_devic structure to initialize
90	*/	90	*/
91	int	91	int
92	drm_gem_init(struct drm_device *dev)	92	drm_gem_init(struct drm_device *dev)
93	{	93	{
94	struct drm_vma_offset_manager *vma_offset_manager;	94	struct drm_vma_offset_manager *vma_offset_manager;
95		95
96	mutex_init(&dev->object_name_lock);	96	mutex_init(&dev->object_name_lock);
97	idr_init(&dev->object_name_idr);	97	idr_init(&dev->object_name_idr);
98		98
99	vma_offset_manager = kzalloc(sizeof(*vma_offset_manager), GFP_KERNEL);	99	vma_offset_manager = kzalloc(sizeof(*vma_offset_manager), GFP_KERNEL);
100	if (!vma_offset_manager) {	100	if (!vma_offset_manager) {
101	DRM_ERROR("out of memory\n");	101	DRM_ERROR("out of memory\n");
102	return -ENOMEM;	102	return -ENOMEM;
103	}	103	}
104		104
105	dev->vma_offset_manager = vma_offset_manager;	105	dev->vma_offset_manager = vma_offset_manager;
106	drm_vma_offset_manager_init(vma_offset_manager,	106	drm_vma_offset_manager_init(vma_offset_manager,
107	DRM_FILE_PAGE_OFFSET_START,	107	DRM_FILE_PAGE_OFFSET_START,
108	DRM_FILE_PAGE_OFFSET_SIZE);	108	DRM_FILE_PAGE_OFFSET_SIZE);
109		109
110	return 0;	110	return 0;
111	}	111	}
112		112
113	void	113	void
114	drm_gem_destroy(struct drm_device *dev)	114	drm_gem_destroy(struct drm_device *dev)
115	{	115	{
116		116
117	drm_vma_offset_manager_destroy(dev->vma_offset_manager);	117	drm_vma_offset_manager_destroy(dev->vma_offset_manager);
118	kfree(dev->vma_offset_manager);	118	kfree(dev->vma_offset_manager);
119	dev->vma_offset_manager = NULL;	119	dev->vma_offset_manager = NULL;
120	}	120	}
121		121
122	/**	122	/**
123	* drm_gem_object_init - initialize an allocated shmem-backed GEM object	123	* drm_gem_object_init - initialize an allocated shmem-backed GEM object
124	* @dev: drm_device the object should be initialized for	124	* @dev: drm_device the object should be initialized for
125	* @obj: drm_gem_object to initialize	125	* @obj: drm_gem_object to initialize
126	* @size: object size	126	* @size: object size
127	*	127	*
128	* Initialize an already allocated GEM object of the specified size with	128	* Initialize an already allocated GEM object of the specified size with
129	* shmfs backing store.	129	* shmfs backing store.
130	*/	130	*/
131	int drm_gem_object_init(struct drm_device *dev,	131	int drm_gem_object_init(struct drm_device *dev,
132	struct drm_gem_object *obj, size_t size)	132	struct drm_gem_object *obj, size_t size)
133	{	133	{
134	struct file *filp;	134	struct file *filp;
135		135
136	drm_gem_private_object_init(dev, obj, size);	136	drm_gem_private_object_init(dev, obj, size);
137		137
138	filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);	138	filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);
139	if (IS_ERR(filp))	139	if (IS_ERR(filp))
140	return PTR_ERR(filp);	140	return PTR_ERR(filp);
141		141
142	obj->filp = filp;	142	obj->filp = filp;
143		143
144	return 0;	144	return 0;
145	}	145	}
146	EXPORT_SYMBOL(drm_gem_object_init);	146	EXPORT_SYMBOL(drm_gem_object_init);
147		147
148	/**	148	/**
149	* drm_gem_private_object_init - initialize an allocated private GEM object	149	* drm_gem_private_object_init - initialize an allocated private GEM object
150	* @dev: drm_device the object should be initialized for	150	* @dev: drm_device the object should be initialized for
151	* @obj: drm_gem_object to initialize	151	* @obj: drm_gem_object to initialize
152	* @size: object size	152	* @size: object size
153	*	153	*
154	* Initialize an already allocated GEM object of the specified size with	154	* Initialize an already allocated GEM object of the specified size with
155	* no GEM provided backing store. Instead the caller is responsible for	155	* no GEM provided backing store. Instead the caller is responsible for
156	* backing the object and handling it.	156	* backing the object and handling it.
157	*/	157	*/
158	void drm_gem_private_object_init(struct drm_device *dev,	158	void drm_gem_private_object_init(struct drm_device *dev,
159	struct drm_gem_object *obj, size_t size)	159	struct drm_gem_object *obj, size_t size)
160	{	160	{
161	BUG_ON((size & (PAGE_SIZE - 1)) != 0);	161	BUG_ON((size & (PAGE_SIZE - 1)) != 0);
162		162
163	obj->dev = dev;	163	obj->dev = dev;
164	obj->filp = NULL;	164	obj->filp = NULL;
165		165
166	kref_init(&obj->refcount);	166	kref_init(&obj->refcount);
167	obj->handle_count = 0;	167	obj->handle_count = 0;
168	obj->size = size;	168	obj->size = size;
169	drm_vma_node_reset(&obj->vma_node);	169	drm_vma_node_reset(&obj->vma_node);
170	}	170	}
171	EXPORT_SYMBOL(drm_gem_private_object_init);	171	EXPORT_SYMBOL(drm_gem_private_object_init);
-		172
-		173	static void
-		174	drm_gem_remove_prime_handles(struct drm_gem_object obj, struct drm_file filp)
-		175	{
-		176	/*
-		177	* Note: obj->dma_buf can't disappear as long as we still hold a
-		178	* handle reference in obj->handle_count.
-		179	*/
-		180	}
172		181
173	/**	182	/**
174	* drm_gem_object_handle_free - release resources bound to userspace handles	183	* drm_gem_object_handle_free - release resources bound to userspace handles
175	* @obj: GEM object to clean up.	184	* @obj: GEM object to clean up.
176	*	185	*
177	* Called after the last handle to the object has been closed	186	* Called after the last handle to the object has been closed
178	*	187	*
179	* Removes any name for the object. Note that this must be	188	* Removes any name for the object. Note that this must be
180	* called before drm_gem_object_free or we'll be touching	189	* called before drm_gem_object_free or we'll be touching
181	* freed memory	190	* freed memory
182	*/	191	*/
183	static void drm_gem_object_handle_free(struct drm_gem_object *obj)	192	static void drm_gem_object_handle_free(struct drm_gem_object *obj)
184	{	193	{
185	struct drm_device *dev = obj->dev;	194	struct drm_device *dev = obj->dev;
186		195
187	/* Remove any name for this object */	196	/* Remove any name for this object */
188	if (obj->name) {	197	if (obj->name) {
189	idr_remove(&dev->object_name_idr, obj->name);	198	idr_remove(&dev->object_name_idr, obj->name);
190	obj->name = 0;	199	obj->name = 0;
191	}	200	}
192	}	201	}
193		202
194		203
195	static void	204	static void
196	drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)	205	drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
197	{	206	{
-		207	struct drm_device *dev = obj->dev;
-		208	bool final = false;
-		209
198	if (WARN_ON(obj->handle_count == 0))	210	if (WARN_ON(obj->handle_count == 0))
199	return;	211	return;
200		212
201	/*	213	/*
202	* Must bump handle count first as this may be the last	214	* Must bump handle count first as this may be the last
203	* ref, in which case the object would disappear before we	215	* ref, in which case the object would disappear before we
204	* checked for a name	216	* checked for a name
205	*/	217	*/
206		218
207	mutex_lock(&obj->dev->object_name_lock);	219	mutex_lock(&dev->object_name_lock);
208	if (--obj->handle_count == 0) {	220	if (--obj->handle_count == 0) {
-		221	drm_gem_object_handle_free(obj);
209	drm_gem_object_handle_free(obj);	222	final = true;
210	}	223	}
-		224	mutex_unlock(&dev->object_name_lock);
211	mutex_unlock(&obj->dev->object_name_lock);	225
212		226	if (final)
213	drm_gem_object_unreference_unlocked(obj);	227	drm_gem_object_unreference_unlocked(obj);
214	}	228	}
-		229
-		230	/*
-		231	* Called at device or object close to release the file's
-		232	* handle references on objects.
-		233	*/
-		234	static int
-		235	drm_gem_object_release_handle(int id, void ptr, void data)
-		236	{
-		237	struct drm_file *file_priv = data;
-		238	struct drm_gem_object *obj = ptr;
-		239	struct drm_device *dev = obj->dev;
-		240
-		241	if (drm_core_check_feature(dev, DRIVER_PRIME))
-		242	drm_gem_remove_prime_handles(obj, file_priv);
-		243	// drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
-		244
-		245	if (dev->driver->gem_close_object)
-		246	dev->driver->gem_close_object(obj, file_priv);
-		247
-		248	drm_gem_object_handle_unreference_unlocked(obj);
-		249
-		250	return 0;
-		251	}
215		252
216	/**	253	/**
217	* drm_gem_handle_delete - deletes the given file-private handle	254	* drm_gem_handle_delete - deletes the given file-private handle
218	* @filp: drm file-private structure to use for the handle look up	255	* @filp: drm file-private structure to use for the handle look up
219	* @handle: userspace handle to delete	256	* @handle: userspace handle to delete
220	*	257	*
221	* Removes the GEM handle from the @filp lookup table and if this is the last	258	* Removes the GEM handle from the @filp lookup table which has been added with
-		259	* drm_gem_handle_create(). If this is the last handle also cleans up linked
222	* handle also cleans up linked resources like GEM names.	260	* resources like GEM names.
223	*/	261	*/
224	int	262	int
225	drm_gem_handle_delete(struct drm_file *filp, u32 handle)	263	drm_gem_handle_delete(struct drm_file *filp, u32 handle)
226	{	264	{
227	struct drm_device *dev;	265	struct drm_device *dev;
228	struct drm_gem_object *obj;	266	struct drm_gem_object *obj;
229		267
230	/* This is gross. The idr system doesn't let us try a delete and	268	/* This is gross. The idr system doesn't let us try a delete and
231	* return an error code. It just spews if you fail at deleting.	269	* return an error code. It just spews if you fail at deleting.
232	* So, we have to grab a lock around finding the object and then	270	* So, we have to grab a lock around finding the object and then
233	* doing the delete on it and dropping the refcount, or the user	271	* doing the delete on it and dropping the refcount, or the user
234	* could race us to double-decrement the refcount and cause a	272	* could race us to double-decrement the refcount and cause a
235	* use-after-free later. Given the frequency of our handle lookups,	273	* use-after-free later. Given the frequency of our handle lookups,
236	* we may want to use ida for number allocation and a hash table	274	* we may want to use ida for number allocation and a hash table
237	* for the pointers, anyway.	275	* for the pointers, anyway.
238	*/	276	*/
239	spin_lock(&filp->table_lock);	277	spin_lock(&filp->table_lock);
240		278
241	/* Check if we currently have a reference on the object */	279	/* Check if we currently have a reference on the object */
242	obj = idr_find(&filp->object_idr, handle);	280	obj = idr_find(&filp->object_idr, handle);
243	if (obj == NULL) {	281	if (obj == NULL) {
244	spin_unlock(&filp->table_lock);	282	spin_unlock(&filp->table_lock);
245	return -EINVAL;	283	return -EINVAL;
246	}	284	}
247	dev = obj->dev;	285	dev = obj->dev;
248		286
249	/* Release reference and decrement refcount. */	287	/* Release reference and decrement refcount. */
250	idr_remove(&filp->object_idr, handle);	288	idr_remove(&filp->object_idr, handle);
251	spin_unlock(&filp->table_lock);	289	spin_unlock(&filp->table_lock);
252		-
253	// drm_vma_node_revoke(&obj->vma_node, filp->filp);	-
254		-
255	if (dev->driver->gem_close_object)	-
256	dev->driver->gem_close_object(obj, filp);	-
257		290
258	drm_gem_object_handle_unreference_unlocked(obj);	291	drm_gem_object_release_handle(handle, obj, filp);
259	return 0;	292	return 0;
260	}	293	}
261	EXPORT_SYMBOL(drm_gem_handle_delete);	294	EXPORT_SYMBOL(drm_gem_handle_delete);
262		295
263	/**	296	/**
264	* drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers	297	* drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers
265	* @file: drm file-private structure to remove the dumb handle from	298	* @file: drm file-private structure to remove the dumb handle from
266	* @dev: corresponding drm_device	299	* @dev: corresponding drm_device
267	* @handle: the dumb handle to remove	300	* @handle: the dumb handle to remove
268	*	301	*
269	* This implements the ->dumb_destroy kms driver callback for drivers which use	302	* This implements the ->dumb_destroy kms driver callback for drivers which use
270	* gem to manage their backing storage.	303	* gem to manage their backing storage.
271	*/	304	*/
272	int drm_gem_dumb_destroy(struct drm_file *file,	305	int drm_gem_dumb_destroy(struct drm_file *file,
273	struct drm_device *dev,	306	struct drm_device *dev,
274	uint32_t handle)	307	uint32_t handle)
275	{	308	{
276	return drm_gem_handle_delete(file, handle);	309	return drm_gem_handle_delete(file, handle);
277	}	310	}
278	EXPORT_SYMBOL(drm_gem_dumb_destroy);	311	EXPORT_SYMBOL(drm_gem_dumb_destroy);
279		312
280	/**	313	/**
281	* drm_gem_handle_create_tail - internal functions to create a handle	314	* drm_gem_handle_create_tail - internal functions to create a handle
282	* @file_priv: drm file-private structure to register the handle for	315	* @file_priv: drm file-private structure to register the handle for
283	* @obj: object to register	316	* @obj: object to register
284	* @handlep: pointer to return the created handle to the caller	317	* @handlep: pointer to return the created handle to the caller
285	*	318	*
286	* This expects the dev->object_name_lock to be held already and will drop it	319	* This expects the dev->object_name_lock to be held already and will drop it
287	* before returning. Used to avoid races in establishing new handles when	320	* before returning. Used to avoid races in establishing new handles when
288	* importing an object from either an flink name or a dma-buf.	321	* importing an object from either an flink name or a dma-buf.
-		322	*
-		323	* Handles must be release again through drm_gem_handle_delete(). This is done
-		324	* when userspace closes @file_priv for all attached handles, or through the
-		325	* GEM_CLOSE ioctl for individual handles.
289	*/	326	*/
290	int	327	int
291	drm_gem_handle_create_tail(struct drm_file *file_priv,	328	drm_gem_handle_create_tail(struct drm_file *file_priv,
292	struct drm_gem_object *obj,	329	struct drm_gem_object *obj,
293	u32 *handlep)	330	u32 *handlep)
294	{	331	{
295	struct drm_device *dev = obj->dev;	332	struct drm_device *dev = obj->dev;
-		333	u32 handle;
296	int ret;	334	int ret;
297		335
298	WARN_ON(!mutex_is_locked(&dev->object_name_lock));	336	WARN_ON(!mutex_is_locked(&dev->object_name_lock));
-		337	if (obj->handle_count++ == 0)
-		338	drm_gem_object_reference(obj);
299		339
300	/*	340	/*
301	* Get the user-visible handle using idr. Preload and perform	341	* Get the user-visible handle using idr. Preload and perform
302	* allocation under our spinlock.	342	* allocation under our spinlock.
303	*/	343	*/
304	idr_preload(GFP_KERNEL);	344	idr_preload(GFP_KERNEL);
305	spin_lock(&file_priv->table_lock);	345	spin_lock(&file_priv->table_lock);
306		346
307	ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT);	347	ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT);
308	drm_gem_object_reference(obj);	-
309	obj->handle_count++;	-
-		348
310	spin_unlock(&file_priv->table_lock);	349	spin_unlock(&file_priv->table_lock);
311	idr_preload_end();	350	idr_preload_end();
-		351
312	mutex_unlock(&dev->object_name_lock);	352	mutex_unlock(&dev->object_name_lock);
313	if (ret < 0)	353	if (ret < 0)
314	goto err_unref;	354	goto err_unref;
315		355
316	*handlep = ret;	356	handle = ret;
317		357
318	// ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp);	358	// ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp);
319	// if (ret) {	359	// if (ret) {
320	// drm_gem_handle_delete(file_priv, *handlep);	360	// drm_gem_handle_delete(file_priv, *handlep);
321	// return ret;	361	// return ret;
322	// }	362	// }
323		363
324	if (dev->driver->gem_open_object) {	364	if (dev->driver->gem_open_object) {
325	ret = dev->driver->gem_open_object(obj, file_priv);	365	ret = dev->driver->gem_open_object(obj, file_priv);
326	if (ret)	366	if (ret)
327	goto err_revoke;	367	goto err_revoke;
328	}	368	}
-		369
329		370	*handlep = handle;
330	return 0;	371	return 0;
331		372
332	err_revoke:	373	err_revoke:
333	// drm_vma_node_revoke(&obj->vma_node, file_priv->filp);	374	// drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
334	err_remove:	375	err_remove:
335	spin_lock(&file_priv->table_lock);	376	spin_lock(&file_priv->table_lock);
336	idr_remove(&file_priv->object_idr, *handlep);	377	idr_remove(&file_priv->object_idr, handle);
337	spin_unlock(&file_priv->table_lock);	378	spin_unlock(&file_priv->table_lock);
338	err_unref:	379	err_unref:
339	drm_gem_object_handle_unreference_unlocked(obj);	380	drm_gem_object_handle_unreference_unlocked(obj);
340	return ret;	381	return ret;
341	}	382	}
342		383
343	/**	384	/**
344	* drm_gem_handle_create - create a gem handle for an object	385	* drm_gem_handle_create - create a gem handle for an object
345	* @file_priv: drm file-private structure to register the handle for	386	* @file_priv: drm file-private structure to register the handle for
346	* @obj: object to register	387	* @obj: object to register
347	* @handlep: pionter to return the created handle to the caller	388	* @handlep: pionter to return the created handle to the caller
348	*	389	*
349	* Create a handle for this object. This adds a handle reference	390	* Create a handle for this object. This adds a handle reference
350	* to the object, which includes a regular reference count. Callers	391	* to the object, which includes a regular reference count. Callers
351	* will likely want to dereference the object afterwards.	392	* will likely want to dereference the object afterwards.
352	*/	393	*/
353	int drm_gem_handle_create(struct drm_file *file_priv,	394	int drm_gem_handle_create(struct drm_file *file_priv,
354	struct drm_gem_object *obj,	395	struct drm_gem_object *obj,
355	u32 *handlep)	396	u32 *handlep)
356	{	397	{
357	mutex_lock(&obj->dev->object_name_lock);	398	mutex_lock(&obj->dev->object_name_lock);
358		399
359	return drm_gem_handle_create_tail(file_priv, obj, handlep);	400	return drm_gem_handle_create_tail(file_priv, obj, handlep);
360	}	401	}
361	EXPORT_SYMBOL(drm_gem_handle_create);	402	EXPORT_SYMBOL(drm_gem_handle_create);
362		403
363	#if 0	404	#if 0
364	/**	405	/**
365	* drm_gem_free_mmap_offset - release a fake mmap offset for an object	406	* drm_gem_free_mmap_offset - release a fake mmap offset for an object
366	* @obj: obj in question	407	* @obj: obj in question
367	*	408	*
368	* This routine frees fake offsets allocated by drm_gem_create_mmap_offset().	409	* This routine frees fake offsets allocated by drm_gem_create_mmap_offset().
369	*/	410	*/
370	void	411	void
371	drm_gem_free_mmap_offset(struct drm_gem_object *obj)	412	drm_gem_free_mmap_offset(struct drm_gem_object *obj)
372	{	413	{
373	struct drm_device *dev = obj->dev;	414	struct drm_device *dev = obj->dev;
374		415
375	drm_vma_offset_remove(dev->vma_offset_manager, &obj->vma_node);	416	drm_vma_offset_remove(dev->vma_offset_manager, &obj->vma_node);
376	}	417	}
377	EXPORT_SYMBOL(drm_gem_free_mmap_offset);	418	EXPORT_SYMBOL(drm_gem_free_mmap_offset);
378		419
379	/**	420	/**
380	* drm_gem_create_mmap_offset_size - create a fake mmap offset for an object	421	* drm_gem_create_mmap_offset_size - create a fake mmap offset for an object
381	* @obj: obj in question	422	* @obj: obj in question
382	* @size: the virtual size	423	* @size: the virtual size
383	*	424	*
384	* GEM memory mapping works by handing back to userspace a fake mmap offset	425	* GEM memory mapping works by handing back to userspace a fake mmap offset
385	* it can use in a subsequent mmap(2) call. The DRM core code then looks	426	* it can use in a subsequent mmap(2) call. The DRM core code then looks
386	* up the object based on the offset and sets up the various memory mapping	427	* up the object based on the offset and sets up the various memory mapping
387	* structures.	428	* structures.
388	*	429	*
389	* This routine allocates and attaches a fake offset for @obj, in cases where	430	* This routine allocates and attaches a fake offset for @obj, in cases where
390	* the virtual size differs from the physical size (ie. obj->size). Otherwise	431	* the virtual size differs from the physical size (ie. obj->size). Otherwise
391	* just use drm_gem_create_mmap_offset().	432	* just use drm_gem_create_mmap_offset().
392	*/	433	*/
393	int	434	int
394	drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size)	435	drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size)
395	{	436	{
396	struct drm_device *dev = obj->dev;	437	struct drm_device *dev = obj->dev;
397		438
398	return drm_vma_offset_add(dev->vma_offset_manager, &obj->vma_node,	439	return drm_vma_offset_add(dev->vma_offset_manager, &obj->vma_node,
399	size / PAGE_SIZE);	440	size / PAGE_SIZE);
400	}	441	}
401	EXPORT_SYMBOL(drm_gem_create_mmap_offset_size);	442	EXPORT_SYMBOL(drm_gem_create_mmap_offset_size);
402		443
403	/**	444	/**
404	* drm_gem_create_mmap_offset - create a fake mmap offset for an object	445	* drm_gem_create_mmap_offset - create a fake mmap offset for an object
405	* @obj: obj in question	446	* @obj: obj in question
406	*	447	*
407	* GEM memory mapping works by handing back to userspace a fake mmap offset	448	* GEM memory mapping works by handing back to userspace a fake mmap offset
408	* it can use in a subsequent mmap(2) call. The DRM core code then looks	449	* it can use in a subsequent mmap(2) call. The DRM core code then looks
409	* up the object based on the offset and sets up the various memory mapping	450	* up the object based on the offset and sets up the various memory mapping
410	* structures.	451	* structures.
411	*	452	*
412	* This routine allocates and attaches a fake offset for @obj.	453	* This routine allocates and attaches a fake offset for @obj.
413	*/	454	*/
414	int drm_gem_create_mmap_offset(struct drm_gem_object *obj)	455	int drm_gem_create_mmap_offset(struct drm_gem_object *obj)
415	{	456	{
416	return drm_gem_create_mmap_offset_size(obj, obj->size);	457	return drm_gem_create_mmap_offset_size(obj, obj->size);
417	}	458	}
418	EXPORT_SYMBOL(drm_gem_create_mmap_offset);	459	EXPORT_SYMBOL(drm_gem_create_mmap_offset);
419		460
420	/**	461	/**
421	* drm_gem_get_pages - helper to allocate backing pages for a GEM object	462	* drm_gem_get_pages - helper to allocate backing pages for a GEM object
422	* from shmem	463	* from shmem
423	* @obj: obj in question	464	* @obj: obj in question
424	*	465	*
425	* This reads the page-array of the shmem-backing storage of the given gem	466	* This reads the page-array of the shmem-backing storage of the given gem
426	* object. An array of pages is returned. If a page is not allocated or	467	* object. An array of pages is returned. If a page is not allocated or
427	* swapped-out, this will allocate/swap-in the required pages. Note that the	468	* swapped-out, this will allocate/swap-in the required pages. Note that the
428	* whole object is covered by the page-array and pinned in memory.	469	* whole object is covered by the page-array and pinned in memory.
429	*	470	*
430	* Use drm_gem_put_pages() to release the array and unpin all pages.	471	* Use drm_gem_put_pages() to release the array and unpin all pages.
431	*	472	*
432	* This uses the GFP-mask set on the shmem-mapping (see mapping_set_gfp_mask()).	473	* This uses the GFP-mask set on the shmem-mapping (see mapping_set_gfp_mask()).
433	* If you require other GFP-masks, you have to do those allocations yourself.	474	* If you require other GFP-masks, you have to do those allocations yourself.
434	*	475	*
435	* Note that you are not allowed to change gfp-zones during runtime. That is,	476	* Note that you are not allowed to change gfp-zones during runtime. That is,
436	* shmem_read_mapping_page_gfp() must be called with the same gfp_zone(gfp) as	477	* shmem_read_mapping_page_gfp() must be called with the same gfp_zone(gfp) as
437	* set during initialization. If you have special zone constraints, set them	478	* set during initialization. If you have special zone constraints, set them
438	* after drm_gem_init_object() via mapping_set_gfp_mask(). shmem-core takes care	479	* after drm_gem_init_object() via mapping_set_gfp_mask(). shmem-core takes care
439	* to keep pages in the required zone during swap-in.	480	* to keep pages in the required zone during swap-in.
440	*/	481	*/
441	struct page *drm_gem_get_pages(struct drm_gem_object obj)	482	struct page *drm_gem_get_pages(struct drm_gem_object obj)
442	{	483	{
443	struct address_space *mapping;	484	struct address_space *mapping;
444	struct page p, *pages;	485	struct page p, *pages;
445	int i, npages;	486	int i, npages;
446		487
447	/* This is the shared memory object that backs the GEM resource */	488	/* This is the shared memory object that backs the GEM resource */
448	mapping = file_inode(obj->filp)->i_mapping;	489	mapping = file_inode(obj->filp)->i_mapping;
449		490
450	/* We already BUG_ON() for non-page-aligned sizes in	491	/* We already BUG_ON() for non-page-aligned sizes in
451	* drm_gem_object_init(), so we should never hit this unless	492	* drm_gem_object_init(), so we should never hit this unless
452	* driver author is doing something really wrong:	493	* driver author is doing something really wrong:

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/drm_gem.c – Rev 6935 → 6937