drm/prime: proper locking+refcounting for obj->dma_buf link

[linux-2.6.git] / drivers / gpu / 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 <eric@anholt.net>
 *
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/module.h>
#include <linux/mman.h>
#include <linux/pagemap.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <drm/drmP.h>
#include <drm/drm_vma_manager.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

/**
 * Initialize the GEM device fields
 */

int
drm_gem_init(struct drm_device *dev)
{
        struct drm_gem_mm *mm;

        mutex_init(&dev->object_name_lock);
        idr_init(&dev->object_name_idr);

        mm = kzalloc(sizeof(struct drm_gem_mm), GFP_KERNEL);
        if (!mm) {
                DRM_ERROR("out of memory\n");
                return -ENOMEM;
        }

        dev->mm_private = mm;
        drm_vma_offset_manager_init(&mm->vma_manager,
                                    DRM_FILE_PAGE_OFFSET_START,
                                    DRM_FILE_PAGE_OFFSET_SIZE);

        return 0;
}

void
drm_gem_destroy(struct drm_device *dev)
{
        struct drm_gem_mm *mm = dev->mm_private;

        drm_vma_offset_manager_destroy(&mm->vma_manager);
        kfree(mm);
        dev->mm_private = NULL;
}

/**
 * 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;

        filp = shmem_file_setup("drm mm object", size, VM_NORESERVE);
        if (IS_ERR(filp))
                return PTR_ERR(filp);

        drm_gem_private_object_init(dev, obj, size);
        obj->filp = filp;

        return 0;
}
EXPORT_SYMBOL(drm_gem_object_init);

/**
 * 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;
}
EXPORT_SYMBOL(drm_gem_private_object_init);

/**
 * Allocate a GEM object of the specified size with shmfs backing store
 */
struct drm_gem_object *
drm_gem_object_alloc(struct drm_device *dev, size_t size)
{
        struct drm_gem_object *obj;

        obj = kzalloc(sizeof(*obj), GFP_KERNEL);
        if (!obj)
                goto free;

        if (drm_gem_object_init(dev, obj, size) != 0)
                goto free;

        if (dev->driver->gem_init_object != NULL &&
            dev->driver->gem_init_object(obj) != 0) {
                goto fput;
        }
        return obj;
fput:
        /* Object_init mangles the global counters - readjust them. */
        fput(obj->filp);
free:
        kfree(obj);
        return NULL;
}
EXPORT_SYMBOL(drm_gem_object_alloc);

static void
drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp)
{
        if (obj->import_attach) {
                drm_prime_remove_buf_handle(&filp->prime,
                                obj->import_attach->dmabuf);
        }

        /*
         * Note: obj->dma_buf can't disappear as long as we still hold a
         * handle reference in obj->handle_count.
         */
        if (obj->dma_buf) {
                drm_prime_remove_buf_handle(&filp->prime,
                                obj->dma_buf);
        }
}

static void drm_gem_object_ref_bug(struct kref *list_kref)
{
        BUG();
}

/**
 * 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;
                /*
                 * The object name held a reference to this object, drop
                 * that now.
                *
                * This cannot be the last reference, since the handle holds one too.
                 */
                kref_put(&obj->refcount, drm_gem_object_ref_bug);
        }
}

static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj)
{
        /* Unbreak the reference cycle if we have an exported dma_buf. */
        if (obj->dma_buf) {
                dma_buf_put(obj->dma_buf);
                obj->dma_buf = NULL;
        }
}

static void
drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
{
        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(&obj->dev->object_name_lock);
        if (--obj->handle_count == 0) {
                drm_gem_object_handle_free(obj);
                drm_gem_object_exported_dma_buf_free(obj);
        }
        mutex_unlock(&obj->dev->object_name_lock);

        drm_gem_object_unreference_unlocked(obj);
}

/**
 * Removes the mapping from handle to filp for this object.
 */
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_remove_prime_handles(obj, filp);

        if (dev->driver->gem_close_object)
                dev->driver->gem_close_object(obj, filp);
        drm_gem_object_handle_unreference_unlocked(obj);

        return 0;
}
EXPORT_SYMBOL(drm_gem_handle_delete);

/**
 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers
 * 
 * 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
 * 
 * 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.
 */
int
drm_gem_handle_create_tail(struct drm_file *file_priv,
                           struct drm_gem_object *obj,
                           u32 *handlep)
{
        struct drm_device *dev = obj->dev;
        int ret;

        WARN_ON(!mutex_is_locked(&dev->object_name_lock));

        /*
         * 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);
        drm_gem_object_reference(obj);
        obj->handle_count++;
        spin_unlock(&file_priv->table_lock);
        idr_preload_end();
        mutex_unlock(&dev->object_name_lock);
        if (ret < 0) {
                drm_gem_object_handle_unreference_unlocked(obj);
                return ret;
        }
        *handlep = ret;


        if (dev->driver->gem_open_object) {
                ret = dev->driver->gem_open_object(obj, file_priv);
                if (ret) {
                        drm_gem_handle_delete(file_priv, *handlep);
                        return ret;
                }
        }

        return 0;
}

/**
 * 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);


/**
 * 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;
        struct drm_gem_mm *mm = dev->mm_private;

        drm_vma_offset_remove(&mm->vma_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;
        struct drm_gem_mm *mm = dev->mm_private;

        return drm_vma_offset_add(&mm->vma_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
 * @gfpmask: gfp mask of requested pages
 */
struct page **drm_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask)
{
        struct inode *inode;
        struct address_space *mapping;
        struct page *p, **pages;
        int i, npages;

        /* This is the shared memory object that backs the GEM resource */
        inode = file_inode(obj->filp);
        mapping = inode->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);

        gfpmask |= mapping_gfp_mask(mapping);

        for (i = 0; i < npages; i++) {
                p = shmem_read_mapping_page_gfp(mapping, i, gfpmask);
                if (IS_ERR(p))
                        goto fail;
                pages[i] = p;

                /* There is a hypothetical issue w/ drivers that require
                 * buffer memory in the low 4GB.. if the pages are un-
                 * pinned, and swapped out, they can end up swapped back
                 * in above 4GB.  If pages are already in memory, then
                 * shmem_read_mapping_page_gfp will ignore the gfpmask,
                 * even if the already in-memory page disobeys the mask.
                 *
                 * It is only a theoretical issue today, because none of
                 * the devices with this limitation can be populated with
                 * enough memory to trigger the issue.  But this BUG_ON()
                 * is here as a reminder in case the problem with
                 * shmem_read_mapping_page_gfp() isn't solved by the time
                 * it does become a real issue.
                 *
                 * See this thread: http://lkml.org/lkml/2011/7/11/238
                 */
                BUG_ON((gfpmask & __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);

/** Returns a reference to the object named by the handle. */
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);

/**
 * 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 (!(dev->driver->driver_features & DRIVER_GEM))
                return -ENODEV;

        ret = drm_gem_handle_delete(file_priv, args->handle);

        return ret;
}

/**
 * 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 (!(dev->driver->driver_features & 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);
        idr_preload(GFP_KERNEL);
        /* 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_NOWAIT);
                if (ret < 0)
                        goto err;

                obj->name = ret;

                /* Allocate a reference for the name table.  */
                drm_gem_object_reference(obj);
        }

        args->name = (uint64_t) obj->name;
        ret = 0;

err:
        idr_preload_end();
        mutex_unlock(&dev->object_name_lock);
        drm_gem_object_unreference_unlocked(obj);
        return ret;
}

/**
 * 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 (!(dev->driver->driver_features & 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;

        return 0;
}

/**
 * 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);
}

/**
 * Called at device 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;

        drm_gem_remove_prime_handles(obj, file_priv);

        if (dev->driver->gem_close_object)
                dev->driver->gem_close_object(obj, file_priv);

        drm_gem_object_handle_unreference_unlocked(obj);

        return 0;
}

/**
 * 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);
}

void
drm_gem_object_release(struct drm_gem_object *obj)
{
        WARN_ON(obj->dma_buf);

        if (obj->filp)
            fput(obj->filp);
}
EXPORT_SYMBOL(drm_gem_object_release);

/**
 * 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 = (struct drm_gem_object *) kref;
        struct drm_device *dev = obj->dev;

        BUG_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);

void drm_gem_vm_open(struct vm_area_struct *vma)
{
        struct drm_gem_object *obj = vma->vm_private_data;

        drm_gem_object_reference(obj);

        mutex_lock(&obj->dev->struct_mutex);
        drm_vm_open_locked(obj->dev, vma);
        mutex_unlock(&obj->dev->struct_mutex);
}
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);

/**
 * drm_gem_mmap_obj - memory map a GEM object
 * @obj: the GEM object to map
 * @obj_size: the object size to be mapped, in bytes
 * @vma: VMA for the area to be mapped
 *
 * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops
 * provided by the driver. Depending on their requirements, drivers can either
 * provide a fault handler in their gem_vm_ops (in which case any accesses to
 * the object will be trapped, to perform migration, GTT binding, surface
 * register allocation, or performance monitoring), or mmap the buffer memory
 * synchronously after calling drm_gem_mmap_obj.
 *
 * This function is mainly intended to implement the DMABUF mmap operation, when
 * the GEM object is not looked up based on its fake offset. To implement the
 * DRM mmap operation, drivers should use the drm_gem_mmap() function.
 *
 * NOTE: This function has to be protected with dev->struct_mutex
 *
 * Return 0 or success or -EINVAL if the object size is smaller than the VMA
 * size, or if no gem_vm_ops are provided.
 */
int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
                     struct vm_area_struct *vma)
{
        struct drm_device *dev = obj->dev;

        lockdep_assert_held(&dev->struct_mutex);

        /* Check for valid size. */
        if (obj_size < vma->vm_end - vma->vm_start)
                return -EINVAL;

        if (!dev->driver->gem_vm_ops)
                return -EINVAL;

        vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
        vma->vm_ops = dev->driver->gem_vm_ops;
        vma->vm_private_data = obj;
        vma->vm_page_prot =  pgprot_writecombine(vm_get_page_prot(vma->vm_flags));

        /* Take a ref for this mapping of the object, so that the fault
         * handler can dereference the mmap offset's pointer to the object.
         * This reference is cleaned up by the corresponding vm_close
         * (which should happen whether the vma was created by this call, or
         * by a vm_open due to mremap or partial unmap or whatever).
         */
        drm_gem_object_reference(obj);

        drm_vm_open_locked(dev, vma);
        return 0;
}
EXPORT_SYMBOL(drm_gem_mmap_obj);

/**
 * drm_gem_mmap - memory map routine for GEM objects
 * @filp: DRM file pointer
 * @vma: VMA for the area to be mapped
 *
 * If a driver supports GEM object mapping, mmap calls on the DRM file
 * descriptor will end up here.
 *
 * Look up the GEM object based on the offset passed in (vma->vm_pgoff will
 * contain the fake offset we created when the GTT map ioctl was called on
 * the object) and map it with a call to drm_gem_mmap_obj().
 */
int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
        struct drm_file *priv = filp->private_data;
        struct drm_device *dev = priv->minor->dev;
        struct drm_gem_mm *mm = dev->mm_private;
        struct drm_gem_object *obj;
        struct drm_vma_offset_node *node;
        int ret = 0;

        if (drm_device_is_unplugged(dev))
                return -ENODEV;

        mutex_lock(&dev->struct_mutex);

        node = drm_vma_offset_exact_lookup(&mm->vma_manager, vma->vm_pgoff,
                                           vma_pages(vma));
        if (!node) {
                mutex_unlock(&dev->struct_mutex);
                return drm_mmap(filp, vma);
        }

        obj = container_of(node, struct drm_gem_object, vma_node);
        ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, vma);

        mutex_unlock(&dev->struct_mutex);

        return ret;
}
EXPORT_SYMBOL(drm_gem_mmap);