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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *  Copyright © 2015 Broadcom
  */
 
 /**
  * DOC: VC4 GEM BO management support
  *
  * The VC4 GPU architecture (both scanout and rendering) has direct
  * access to system memory with no MMU in between.  To support it, we
  * use the GEM CMA helper functions to allocate contiguous ranges of
  * physical memory for our BOs.
  *
  * Since the CMA allocator is very slow, we keep a cache of recently
  * freed BOs around so that the kernel's allocation of objects for 3D
  * rendering can return quickly.
  */
 
 #include <linux/dma-buf.h>
 
 #include <drm/drm_fourcc.h>
 
 #include "vc4_drv.h"
 #include "uapi/drm/vc4_drm.h"
 
 static const struct drm_gem_object_funcs vc4_gem_object_funcs;
 
 static const char * const bo_type_names[] = {
     "kernel",
     "V3D",
     "V3D shader",
     "dumb",
     "binner",
     "RCL",
     "BCL",
     "kernel BO cache",
 };
 
 static bool is_user_label(int label)
 {
     return label >= VC4_BO_TYPE_COUNT;
 }
 
 static void vc4_bo_stats_print(struct drm_printer *p, struct vc4_dev *vc4)
 {
     int i;
 
     for (i = 0; i < vc4->num_labels; i++) {
         if (!vc4->bo_labels[i].num_allocated)
             continue;
 
         drm_printf(p, "%30s: %6dkb BOs (%d)\n",
                vc4->bo_labels[i].name,
                vc4->bo_labels[i].size_allocated / 1024,
                vc4->bo_labels[i].num_allocated);
     }
 
     mutex_lock(&vc4->purgeable.lock);
     if (vc4->purgeable.num)
         drm_printf(p, "%30s: %6zdkb BOs (%d)\n", "userspace BO cache",
                vc4->purgeable.size / 1024, vc4->purgeable.num);
 
     if (vc4->purgeable.purged_num)
         drm_printf(p, "%30s: %6zdkb BOs (%d)\n", "total purged BO",
                vc4->purgeable.purged_size / 1024,
                vc4->purgeable.purged_num);
     mutex_unlock(&vc4->purgeable.lock);
 }
 
 static int vc4_bo_stats_debugfs(struct seq_file *m, void *unused)
 {
     struct drm_info_node *node = (struct drm_info_node *)m->private;
     struct drm_device *dev = node->minor->dev;
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct drm_printer p = drm_seq_file_printer(m);
 
     vc4_bo_stats_print(&p, vc4);
 
     return 0;
 }
 
 /* Takes ownership of *name and returns the appropriate slot for it in
  * the bo_labels[] array, extending it as necessary.
  *
  * This is inefficient and could use a hash table instead of walking
  * an array and strcmp()ing.  However, the assumption is that user
  * labeling will be infrequent (scanout buffers and other long-lived
  * objects, or debug driver builds), so we can live with it for now.
  */
 static int vc4_get_user_label(struct vc4_dev *vc4, const char *name)
 {
     int i;
     int free_slot = -1;
 
     for (i = 0; i < vc4->num_labels; i++) {
         if (!vc4->bo_labels[i].name) {
             free_slot = i;
         } else if (strcmp(vc4->bo_labels[i].name, name) == 0) {
             kfree(name);
             return i;
         }
     }
 
     if (free_slot != -1) {
         WARN_ON(vc4->bo_labels[free_slot].num_allocated != 0);
         vc4->bo_labels[free_slot].name = name;
         return free_slot;
     } else {
         u32 new_label_count = vc4->num_labels + 1;
         struct vc4_label *new_labels =
             krealloc(vc4->bo_labels,
                  new_label_count * sizeof(*new_labels),
                  GFP_KERNEL);
 
         if (!new_labels) {
             kfree(name);
             return -1;
         }
 
         free_slot = vc4->num_labels;
         vc4->bo_labels = new_labels;
         vc4->num_labels = new_label_count;
 
         vc4->bo_labels[free_slot].name = name;
         vc4->bo_labels[free_slot].num_allocated = 0;
         vc4->bo_labels[free_slot].size_allocated = 0;
 
         return free_slot;
     }
 }
 
 static void vc4_bo_set_label(struct drm_gem_object *gem_obj, int label)
 {
     struct vc4_bo *bo = to_vc4_bo(gem_obj);
     struct vc4_dev *vc4 = to_vc4_dev(gem_obj->dev);
 
     lockdep_assert_held(&vc4->bo_lock);
 
     if (label != -1) {
         vc4->bo_labels[label].num_allocated++;
         vc4->bo_labels[label].size_allocated += gem_obj->size;
     }
 
     vc4->bo_labels[bo->label].num_allocated--;
     vc4->bo_labels[bo->label].size_allocated -= gem_obj->size;
 
     if (vc4->bo_labels[bo->label].num_allocated == 0 &&
         is_user_label(bo->label)) {
         /* Free user BO label slots on last unreference.
          * Slots are just where we track the stats for a given
          * name, and once a name is unused we can reuse that
          * slot.
          */
         kfree(vc4->bo_labels[bo->label].name);
         vc4->bo_labels[bo->label].name = NULL;
     }
 
     bo->label = label;
 }
 
 static uint32_t bo_page_index(size_t size)
 {
     return (size / PAGE_SIZE) - 1;
 }
 
 static void vc4_bo_destroy(struct vc4_bo *bo)
 {
     struct drm_gem_object *obj = &bo->base.base;
     struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
 
     lockdep_assert_held(&vc4->bo_lock);
 
     vc4_bo_set_label(obj, -1);
 
     if (bo->validated_shader) {
         kfree(bo->validated_shader->uniform_addr_offsets);
         kfree(bo->validated_shader->texture_samples);
         kfree(bo->validated_shader);
         bo->validated_shader = NULL;
     }
 
     drm_gem_cma_free(&bo->base);
 }
 
 static void vc4_bo_remove_from_cache(struct vc4_bo *bo)
 {
     struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
     lockdep_assert_held(&vc4->bo_lock);
     list_del(&bo->unref_head);
     list_del(&bo->size_head);
 }
 
 static struct list_head *vc4_get_cache_list_for_size(struct drm_device *dev,
                              size_t size)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     uint32_t page_index = bo_page_index(size);
 
     if (vc4->bo_cache.size_list_size <= page_index) {
         uint32_t new_size = max(vc4->bo_cache.size_list_size * 2,
                     page_index + 1);
         struct list_head *new_list;
         uint32_t i;
 
         new_list = kmalloc_array(new_size, sizeof(struct list_head),
                      GFP_KERNEL);
         if (!new_list)
             return NULL;
 
         /* Rebase the old cached BO lists to their new list
          * head locations.
          */
         for (i = 0; i < vc4->bo_cache.size_list_size; i++) {
             struct list_head *old_list =
                 &vc4->bo_cache.size_list[i];
 
             if (list_empty(old_list))
                 INIT_LIST_HEAD(&new_list[i]);
             else
                 list_replace(old_list, &new_list[i]);
         }
         /* And initialize the brand new BO list heads. */
         for (i = vc4->bo_cache.size_list_size; i < new_size; i++)
             INIT_LIST_HEAD(&new_list[i]);
 
         kfree(vc4->bo_cache.size_list);
         vc4->bo_cache.size_list = new_list;
         vc4->bo_cache.size_list_size = new_size;
     }
 
     return &vc4->bo_cache.size_list[page_index];
 }
 
 static void vc4_bo_cache_purge(struct drm_device *dev)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
 
     mutex_lock(&vc4->bo_lock);
     while (!list_empty(&vc4->bo_cache.time_list)) {
         struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
                             struct vc4_bo, unref_head);
         vc4_bo_remove_from_cache(bo);
         vc4_bo_destroy(bo);
     }
     mutex_unlock(&vc4->bo_lock);
 }
 
 void vc4_bo_add_to_purgeable_pool(struct vc4_bo *bo)
 {
     struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return;
 
     mutex_lock(&vc4->purgeable.lock);
     list_add_tail(&bo->size_head, &vc4->purgeable.list);
     vc4->purgeable.num++;
     vc4->purgeable.size += bo->base.base.size;
     mutex_unlock(&vc4->purgeable.lock);
 }
 
 static void vc4_bo_remove_from_purgeable_pool_locked(struct vc4_bo *bo)
 {
     struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return;
 
     /* list_del_init() is used here because the caller might release
      * the purgeable lock in order to acquire the madv one and update the
      * madv status.
      * During this short period of time a user might decide to mark
      * the BO as unpurgeable, and if bo->madv is set to
      * VC4_MADV_DONTNEED it will try to remove the BO from the
      * purgeable list which will fail if the ->next/prev fields
      * are set to LIST_POISON1/LIST_POISON2 (which is what
      * list_del() does).
      * Re-initializing the list element guarantees that list_del()
      * will work correctly even if it's a NOP.
      */
     list_del_init(&bo->size_head);
     vc4->purgeable.num--;
     vc4->purgeable.size -= bo->base.base.size;
 }
 
 void vc4_bo_remove_from_purgeable_pool(struct vc4_bo *bo)
 {
     struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
     mutex_lock(&vc4->purgeable.lock);
     vc4_bo_remove_from_purgeable_pool_locked(bo);
     mutex_unlock(&vc4->purgeable.lock);
 }
 
 static void vc4_bo_purge(struct drm_gem_object *obj)
 {
     struct vc4_bo *bo = to_vc4_bo(obj);
     struct drm_device *dev = obj->dev;
 
     WARN_ON(!mutex_is_locked(&bo->madv_lock));
     WARN_ON(bo->madv != VC4_MADV_DONTNEED);
 
     drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
 
     dma_free_wc(dev->dev, obj->size, bo->base.vaddr, bo->base.paddr);
     bo->base.vaddr = NULL;
     bo->madv = __VC4_MADV_PURGED;
 }
 
 static void vc4_bo_userspace_cache_purge(struct drm_device *dev)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
 
     mutex_lock(&vc4->purgeable.lock);
     while (!list_empty(&vc4->purgeable.list)) {
         struct vc4_bo *bo = list_first_entry(&vc4->purgeable.list,
                              struct vc4_bo, size_head);
         struct drm_gem_object *obj = &bo->base.base;
         size_t purged_size = 0;
 
         vc4_bo_remove_from_purgeable_pool_locked(bo);
 
         /* Release the purgeable lock while we're purging the BO so
          * that other people can continue inserting things in the
          * purgeable pool without having to wait for all BOs to be
          * purged.
          */
         mutex_unlock(&vc4->purgeable.lock);
         mutex_lock(&bo->madv_lock);
 
         /* Since we released the purgeable pool lock before acquiring
          * the BO madv one, the user may have marked the BO as WILLNEED
          * and re-used it in the meantime.
          * Before purging the BO we need to make sure
          * - it is still marked as DONTNEED
          * - it has not been re-inserted in the purgeable list
          * - it is not used by HW blocks
          * If one of these conditions is not met, just skip the entry.
          */
         if (bo->madv == VC4_MADV_DONTNEED &&
             list_empty(&bo->size_head) &&
             !refcount_read(&bo->usecnt)) {
             purged_size = bo->base.base.size;
             vc4_bo_purge(obj);
         }
         mutex_unlock(&bo->madv_lock);
         mutex_lock(&vc4->purgeable.lock);
 
         if (purged_size) {
             vc4->purgeable.purged_size += purged_size;
             vc4->purgeable.purged_num++;
         }
     }
     mutex_unlock(&vc4->purgeable.lock);
 }
 
 static struct vc4_bo *vc4_bo_get_from_cache(struct drm_device *dev,
                         uint32_t size,
                         enum vc4_kernel_bo_type type)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     uint32_t page_index = bo_page_index(size);
     struct vc4_bo *bo = NULL;
 
     mutex_lock(&vc4->bo_lock);
     if (page_index >= vc4->bo_cache.size_list_size)
         goto out;
 
     if (list_empty(&vc4->bo_cache.size_list[page_index]))
         goto out;
 
     bo = list_first_entry(&vc4->bo_cache.size_list[page_index],
                   struct vc4_bo, size_head);
     vc4_bo_remove_from_cache(bo);
     kref_init(&bo->base.base.refcount);
 
 out:
     if (bo)
         vc4_bo_set_label(&bo->base.base, type);
     mutex_unlock(&vc4->bo_lock);
     return bo;
 }
 
 /**
  * vc4_create_object - Implementation of driver->gem_create_object.
  * @dev: DRM device
  * @size: Size in bytes of the memory the object will reference
  *
  * This lets the CMA helpers allocate object structs for us, and keep
  * our BO stats correct.
  */
 struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct vc4_bo *bo;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return ERR_PTR(-ENODEV);
 
     bo = kzalloc(sizeof(*bo), GFP_KERNEL);
     if (!bo)
         return ERR_PTR(-ENOMEM);
 
     bo->madv = VC4_MADV_WILLNEED;
     refcount_set(&bo->usecnt, 0);
     mutex_init(&bo->madv_lock);
     mutex_lock(&vc4->bo_lock);
     bo->label = VC4_BO_TYPE_KERNEL;
     vc4->bo_labels[VC4_BO_TYPE_KERNEL].num_allocated++;
     vc4->bo_labels[VC4_BO_TYPE_KERNEL].size_allocated += size;
     mutex_unlock(&vc4->bo_lock);
 
     bo->base.base.funcs = &vc4_gem_object_funcs;
 
     return &bo->base.base;
 }
 
 struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size,
                  bool allow_unzeroed, enum vc4_kernel_bo_type type)
 {
     size_t size = roundup(unaligned_size, PAGE_SIZE);
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct drm_gem_cma_object *cma_obj;
     struct vc4_bo *bo;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return ERR_PTR(-ENODEV);
 
     if (size == 0)
         return ERR_PTR(-EINVAL);
 
     /* First, try to get a vc4_bo from the kernel BO cache. */
     bo = vc4_bo_get_from_cache(dev, size, type);
     if (bo) {
         if (!allow_unzeroed)
             memset(bo->base.vaddr, 0, bo->base.base.size);
         return bo;
     }
 
     cma_obj = drm_gem_cma_create(dev, size);
     if (IS_ERR(cma_obj)) {
         /*
          * If we've run out of CMA memory, kill the cache of
          * CMA allocations we've got laying around and try again.
          */
         vc4_bo_cache_purge(dev);
         cma_obj = drm_gem_cma_create(dev, size);
     }
 
     if (IS_ERR(cma_obj)) {
         /*
          * Still not enough CMA memory, purge the userspace BO
          * cache and retry.
          * This is sub-optimal since we purge the whole userspace
          * BO cache which forces user that want to re-use the BO to
          * restore its initial content.
          * Ideally, we should purge entries one by one and retry
          * after each to see if CMA allocation succeeds. Or even
          * better, try to find an entry with at least the same
          * size.
          */
         vc4_bo_userspace_cache_purge(dev);
         cma_obj = drm_gem_cma_create(dev, size);
     }
 
     if (IS_ERR(cma_obj)) {
         struct drm_printer p = drm_info_printer(vc4->base.dev);
         DRM_ERROR("Failed to allocate from CMA:\n");
         vc4_bo_stats_print(&p, vc4);
         return ERR_PTR(-ENOMEM);
     }
     bo = to_vc4_bo(&cma_obj->base);
 
     /* By default, BOs do not support the MADV ioctl. This will be enabled
      * only on BOs that are exposed to userspace (V3D, V3D_SHADER and DUMB
      * BOs).
      */
     bo->madv = __VC4_MADV_NOTSUPP;
 
     mutex_lock(&vc4->bo_lock);
     vc4_bo_set_label(&cma_obj->base, type);
     mutex_unlock(&vc4->bo_lock);
 
     return bo;
 }
 
 int vc4_bo_dumb_create(struct drm_file *file_priv,
                struct drm_device *dev,
                struct drm_mode_create_dumb *args)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct vc4_bo *bo = NULL;
     int ret;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     ret = vc4_dumb_fixup_args(args);
     if (ret)
         return ret;
 
     bo = vc4_bo_create(dev, args->size, false, VC4_BO_TYPE_DUMB);
     if (IS_ERR(bo))
         return PTR_ERR(bo);
 
     bo->madv = VC4_MADV_WILLNEED;
 
     ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
     drm_gem_object_put(&bo->base.base);
 
     return ret;
 }
 
 static void vc4_bo_cache_free_old(struct drm_device *dev)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     unsigned long expire_time = jiffies - msecs_to_jiffies(1000);
 
     lockdep_assert_held(&vc4->bo_lock);
 
     while (!list_empty(&vc4->bo_cache.time_list)) {
         struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
                             struct vc4_bo, unref_head);
         if (time_before(expire_time, bo->free_time)) {
             mod_timer(&vc4->bo_cache.time_timer,
                   round_jiffies_up(jiffies +
                            msecs_to_jiffies(1000)));
             return;
         }
 
         vc4_bo_remove_from_cache(bo);
         vc4_bo_destroy(bo);
     }
 }
 
 /* Called on the last userspace/kernel unreference of the BO.  Returns
  * it to the BO cache if possible, otherwise frees it.
  */
 static void vc4_free_object(struct drm_gem_object *gem_bo)
 {
     struct drm_device *dev = gem_bo->dev;
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct vc4_bo *bo = to_vc4_bo(gem_bo);
     struct list_head *cache_list;
 
     /* Remove the BO from the purgeable list. */
     mutex_lock(&bo->madv_lock);
     if (bo->madv == VC4_MADV_DONTNEED && !refcount_read(&bo->usecnt))
         vc4_bo_remove_from_purgeable_pool(bo);
     mutex_unlock(&bo->madv_lock);
 
     mutex_lock(&vc4->bo_lock);
     /* If the object references someone else's memory, we can't cache it.
      */
     if (gem_bo->import_attach) {
         vc4_bo_destroy(bo);
         goto out;
     }
 
     /* Don't cache if it was publicly named. */
     if (gem_bo->name) {
         vc4_bo_destroy(bo);
         goto out;
     }
 
     /* If this object was partially constructed but CMA allocation
      * had failed, just free it. Can also happen when the BO has been
      * purged.
      */
     if (!bo->base.vaddr) {
         vc4_bo_destroy(bo);
         goto out;
     }
 
     cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
     if (!cache_list) {
         vc4_bo_destroy(bo);
         goto out;
     }
 
     if (bo->validated_shader) {
         kfree(bo->validated_shader->uniform_addr_offsets);
         kfree(bo->validated_shader->texture_samples);
         kfree(bo->validated_shader);
         bo->validated_shader = NULL;
     }
 
     /* Reset madv and usecnt before adding the BO to the cache. */
     bo->madv = __VC4_MADV_NOTSUPP;
     refcount_set(&bo->usecnt, 0);
 
     bo->t_format = false;
     bo->free_time = jiffies;
     list_add(&bo->size_head, cache_list);
     list_add(&bo->unref_head, &vc4->bo_cache.time_list);
 
     vc4_bo_set_label(&bo->base.base, VC4_BO_TYPE_KERNEL_CACHE);
 
     vc4_bo_cache_free_old(dev);
 
 out:
     mutex_unlock(&vc4->bo_lock);
 }
 
 static void vc4_bo_cache_time_work(struct work_struct *work)
 {
     struct vc4_dev *vc4 =
         container_of(work, struct vc4_dev, bo_cache.time_work);
     struct drm_device *dev = &vc4->base;
 
     mutex_lock(&vc4->bo_lock);
     vc4_bo_cache_free_old(dev);
     mutex_unlock(&vc4->bo_lock);
 }
 
 int vc4_bo_inc_usecnt(struct vc4_bo *bo)
 {
     struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
     int ret;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     /* Fast path: if the BO is already retained by someone, no need to
      * check the madv status.
      */
     if (refcount_inc_not_zero(&bo->usecnt))
         return 0;
 
     mutex_lock(&bo->madv_lock);
     switch (bo->madv) {
     case VC4_MADV_WILLNEED:
         if (!refcount_inc_not_zero(&bo->usecnt))
             refcount_set(&bo->usecnt, 1);
         ret = 0;
         break;
     case VC4_MADV_DONTNEED:
         /* We shouldn't use a BO marked as purgeable if at least
          * someone else retained its content by incrementing usecnt.
          * Luckily the BO hasn't been purged yet, but something wrong
          * is happening here. Just throw an error instead of
          * authorizing this use case.
          */
     case __VC4_MADV_PURGED:
         /* We can't use a purged BO. */
     default:
         /* Invalid madv value. */
         ret = -EINVAL;
         break;
     }
     mutex_unlock(&bo->madv_lock);
 
     return ret;
 }
 
 void vc4_bo_dec_usecnt(struct vc4_bo *bo)
 {
     struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return;
 
     /* Fast path: if the BO is still retained by someone, no need to test
      * the madv value.
      */
     if (refcount_dec_not_one(&bo->usecnt))
         return;
 
     mutex_lock(&bo->madv_lock);
     if (refcount_dec_and_test(&bo->usecnt) &&
         bo->madv == VC4_MADV_DONTNEED)
         vc4_bo_add_to_purgeable_pool(bo);
     mutex_unlock(&bo->madv_lock);
 }
 
 static void vc4_bo_cache_time_timer(struct timer_list *t)
 {
     struct vc4_dev *vc4 = from_timer(vc4, t, bo_cache.time_timer);
 
     schedule_work(&vc4->bo_cache.time_work);
 }
 
 static struct dma_buf *vc4_prime_export(struct drm_gem_object *obj, int flags)
 {
     struct vc4_bo *bo = to_vc4_bo(obj);
     struct dma_buf *dmabuf;
     int ret;
 
     if (bo->validated_shader) {
         DRM_DEBUG("Attempting to export shader BO\n");
         return ERR_PTR(-EINVAL);
     }
 
     /* Note: as soon as the BO is exported it becomes unpurgeable, because
      * noone ever decrements the usecnt even if the reference held by the
      * exported BO is released. This shouldn't be a problem since we don't
      * expect exported BOs to be marked as purgeable.
      */
     ret = vc4_bo_inc_usecnt(bo);
     if (ret) {
         DRM_ERROR("Failed to increment BO usecnt\n");
         return ERR_PTR(ret);
     }
 
     dmabuf = drm_gem_prime_export(obj, flags);
     if (IS_ERR(dmabuf))
         vc4_bo_dec_usecnt(bo);
 
     return dmabuf;
 }
 
 static vm_fault_t vc4_fault(struct vm_fault *vmf)
 {
     struct vm_area_struct *vma = vmf->vma;
     struct drm_gem_object *obj = vma->vm_private_data;
     struct vc4_bo *bo = to_vc4_bo(obj);
 
     /* The only reason we would end up here is when user-space accesses
      * BO's memory after it's been purged.
      */
     mutex_lock(&bo->madv_lock);
     WARN_ON(bo->madv != __VC4_MADV_PURGED);
     mutex_unlock(&bo->madv_lock);
 
     return VM_FAULT_SIGBUS;
 }
 
 static int vc4_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 {
     struct vc4_bo *bo = to_vc4_bo(obj);
 
     if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
         DRM_DEBUG("mmaping of shader BOs for writing not allowed.\n");
         return -EINVAL;
     }
 
     if (bo->madv != VC4_MADV_WILLNEED) {
         DRM_DEBUG("mmaping of %s BO not allowed\n",
               bo->madv == VC4_MADV_DONTNEED ?
               "purgeable" : "purged");
         return -EINVAL;
     }
 
     return drm_gem_cma_mmap(&bo->base, vma);
 }
 
 static const struct vm_operations_struct vc4_vm_ops = {
     .fault = vc4_fault,
     .open = drm_gem_vm_open,
     .close = drm_gem_vm_close,
 };
 
 static const struct drm_gem_object_funcs vc4_gem_object_funcs = {
     .free = vc4_free_object,
     .export = vc4_prime_export,
     .get_sg_table = drm_gem_cma_object_get_sg_table,
     .vmap = drm_gem_cma_object_vmap,
     .mmap = vc4_gem_object_mmap,
     .vm_ops = &vc4_vm_ops,
 };
 
 static int vc4_grab_bin_bo(struct vc4_dev *vc4, struct vc4_file *vc4file)
 {
     if (!vc4->v3d)
         return -ENODEV;
 
     if (vc4file->bin_bo_used)
         return 0;
 
     return vc4_v3d_bin_bo_get(vc4, &vc4file->bin_bo_used);
 }
 
 int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
 {
     struct drm_vc4_create_bo *args = data;
     struct vc4_file *vc4file = file_priv->driver_priv;
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct vc4_bo *bo = NULL;
     int ret;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     ret = vc4_grab_bin_bo(vc4, vc4file);
     if (ret)
         return ret;
 
     /*
      * We can't allocate from the BO cache, because the BOs don't
      * get zeroed, and that might leak data between users.
      */
     bo = vc4_bo_create(dev, args->size, false, VC4_BO_TYPE_V3D);
     if (IS_ERR(bo))
         return PTR_ERR(bo);
 
     bo->madv = VC4_MADV_WILLNEED;
 
     ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
     drm_gem_object_put(&bo->base.base);
 
     return ret;
 }
 
 int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
               struct drm_file *file_priv)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct drm_vc4_mmap_bo *args = data;
     struct drm_gem_object *gem_obj;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     gem_obj = drm_gem_object_lookup(file_priv, args->handle);
     if (!gem_obj) {
         DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
         return -EINVAL;
     }
 
     /* The mmap offset was set up at BO allocation time. */
     args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
 
     drm_gem_object_put(gem_obj);
     return 0;
 }
 
 int
 vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
                struct drm_file *file_priv)
 {
     struct drm_vc4_create_shader_bo *args = data;
     struct vc4_file *vc4file = file_priv->driver_priv;
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct vc4_bo *bo = NULL;
     int ret;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     if (args->size == 0)
         return -EINVAL;
 
     if (args->size % sizeof(u64) != 0)
         return -EINVAL;
 
     if (args->flags != 0) {
         DRM_INFO("Unknown flags set: 0x%08x\n", args->flags);
         return -EINVAL;
     }
 
     if (args->pad != 0) {
         DRM_INFO("Pad set: 0x%08x\n", args->pad);
         return -EINVAL;
     }
 
     ret = vc4_grab_bin_bo(vc4, vc4file);
     if (ret)
         return ret;
 
     bo = vc4_bo_create(dev, args->size, true, VC4_BO_TYPE_V3D_SHADER);
     if (IS_ERR(bo))
         return PTR_ERR(bo);
 
     bo->madv = VC4_MADV_WILLNEED;
 
     if (copy_from_user(bo->base.vaddr,
                  (void __user *)(uintptr_t)args->data,
                  args->size)) {
         ret = -EFAULT;
         goto fail;
     }
     /* Clear the rest of the memory from allocating from the BO
      * cache.
      */
     memset(bo->base.vaddr + args->size, 0,
            bo->base.base.size - args->size);
 
     bo->validated_shader = vc4_validate_shader(&bo->base);
     if (!bo->validated_shader) {
         ret = -EINVAL;
         goto fail;
     }
 
     /* We have to create the handle after validation, to avoid
      * races for users to do doing things like mmap the shader BO.
      */
     ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
 
 fail:
     drm_gem_object_put(&bo->base.base);
 
     return ret;
 }
 
 /**
  * vc4_set_tiling_ioctl() - Sets the tiling modifier for a BO.
  * @dev: DRM device
  * @data: ioctl argument
  * @file_priv: DRM file for this fd
  *
  * The tiling state of the BO decides the default modifier of an fb if
  * no specific modifier was set by userspace, and the return value of
  * vc4_get_tiling_ioctl() (so that userspace can treat a BO it
  * received from dmabuf as the same tiling format as the producer
  * used).
  */
 int vc4_set_tiling_ioctl(struct drm_device *dev, void *data,
              struct drm_file *file_priv)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct drm_vc4_set_tiling *args = data;
     struct drm_gem_object *gem_obj;
     struct vc4_bo *bo;
     bool t_format;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     if (args->flags != 0)
         return -EINVAL;
 
     switch (args->modifier) {
     case DRM_FORMAT_MOD_NONE:
         t_format = false;
         break;
     case DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED:
         t_format = true;
         break;
     default:
         return -EINVAL;
     }
 
     gem_obj = drm_gem_object_lookup(file_priv, args->handle);
     if (!gem_obj) {
         DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
         return -ENOENT;
     }
     bo = to_vc4_bo(gem_obj);
     bo->t_format = t_format;
 
     drm_gem_object_put(gem_obj);
 
     return 0;
 }
 
 /**
  * vc4_get_tiling_ioctl() - Gets the tiling modifier for a BO.
  * @dev: DRM device
  * @data: ioctl argument
  * @file_priv: DRM file for this fd
  *
  * Returns the tiling modifier for a BO as set by vc4_set_tiling_ioctl().
  */
 int vc4_get_tiling_ioctl(struct drm_device *dev, void *data,
              struct drm_file *file_priv)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct drm_vc4_get_tiling *args = data;
     struct drm_gem_object *gem_obj;
     struct vc4_bo *bo;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     if (args->flags != 0 || args->modifier != 0)
         return -EINVAL;
 
     gem_obj = drm_gem_object_lookup(file_priv, args->handle);
     if (!gem_obj) {
         DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
         return -ENOENT;
     }
     bo = to_vc4_bo(gem_obj);
 
     if (bo->t_format)
         args->modifier = DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED;
     else
         args->modifier = DRM_FORMAT_MOD_NONE;
 
     drm_gem_object_put(gem_obj);
 
     return 0;
 }
 
 static void vc4_bo_cache_destroy(struct drm_device *dev, void *unused);
 int vc4_bo_cache_init(struct drm_device *dev)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     int i;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     /* Create the initial set of BO labels that the kernel will
      * use.  This lets us avoid a bunch of string reallocation in
      * the kernel's draw and BO allocation paths.
      */
     vc4->bo_labels = kcalloc(VC4_BO_TYPE_COUNT, sizeof(*vc4->bo_labels),
                  GFP_KERNEL);
     if (!vc4->bo_labels)
         return -ENOMEM;
     vc4->num_labels = VC4_BO_TYPE_COUNT;
 
     BUILD_BUG_ON(ARRAY_SIZE(bo_type_names) != VC4_BO_TYPE_COUNT);
     for (i = 0; i < VC4_BO_TYPE_COUNT; i++)
         vc4->bo_labels[i].name = bo_type_names[i];
 
     mutex_init(&vc4->bo_lock);
 
     vc4_debugfs_add_file(dev, "bo_stats", vc4_bo_stats_debugfs, NULL);
 
     INIT_LIST_HEAD(&vc4->bo_cache.time_list);
 
     INIT_WORK(&vc4->bo_cache.time_work, vc4_bo_cache_time_work);
     timer_setup(&vc4->bo_cache.time_timer, vc4_bo_cache_time_timer, 0);
 
     return drmm_add_action_or_reset(dev, vc4_bo_cache_destroy, NULL);
 }
 
 static void vc4_bo_cache_destroy(struct drm_device *dev, void *unused)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     int i;
 
     del_timer(&vc4->bo_cache.time_timer);
     cancel_work_sync(&vc4->bo_cache.time_work);
 
     vc4_bo_cache_purge(dev);
 
     for (i = 0; i < vc4->num_labels; i++) {
         if (vc4->bo_labels[i].num_allocated) {
             DRM_ERROR("Destroying BO cache with %d %s "
                   "BOs still allocated\n",
                   vc4->bo_labels[i].num_allocated,
                   vc4->bo_labels[i].name);
         }
 
         if (is_user_label(i))
             kfree(vc4->bo_labels[i].name);
     }
     kfree(vc4->bo_labels);
 }
 
 int vc4_label_bo_ioctl(struct drm_device *dev, void *data,
                struct drm_file *file_priv)
 {
     struct vc4_dev *vc4 = to_vc4_dev(dev);
     struct drm_vc4_label_bo *args = data;
     char *name;
     struct drm_gem_object *gem_obj;
     int ret = 0, label;
 
     if (WARN_ON_ONCE(vc4->is_vc5))
         return -ENODEV;
 
     if (!args->len)
         return -EINVAL;
 
     name = strndup_user(u64_to_user_ptr(args->name), args->len + 1);
     if (IS_ERR(name))
         return PTR_ERR(name);
 
     gem_obj = drm_gem_object_lookup(file_priv, args->handle);
     if (!gem_obj) {
         DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
         kfree(name);
         return -ENOENT;
     }
 
     mutex_lock(&vc4->bo_lock);
     label = vc4_get_user_label(vc4, name);
     if (label != -1)
         vc4_bo_set_label(gem_obj, label);
     else
         ret = -ENOMEM;
     mutex_unlock(&vc4->bo_lock);
 
     drm_gem_object_put(gem_obj);
 
     return ret;
 }

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