OSCL-LXR linux-6.0.1/​drivers/​gpu/​drm/​etnaviv/​etnaviv_gem.c	Source navigation Diff markup Identifier search General search
	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
 /*
  * Copyright (C) 2015-2018 Etnaviv Project
  */
 
 #include <drm/drm_prime.h>
 #include <linux/dma-mapping.h>
 #include <linux/shmem_fs.h>
 #include <linux/spinlock.h>
 #include <linux/vmalloc.h>
 
 #include "etnaviv_drv.h"
 #include "etnaviv_gem.h"
 #include "etnaviv_gpu.h"
 #include "etnaviv_mmu.h"
 
 static struct lock_class_key etnaviv_shm_lock_class;
 static struct lock_class_key etnaviv_userptr_lock_class;
 
 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
 {
     struct drm_device *dev = etnaviv_obj->base.dev;
     struct sg_table *sgt = etnaviv_obj->sgt;
 
     /*
      * For non-cached buffers, ensure the new pages are clean
      * because display controller, GPU, etc. are not coherent.
      */
     if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
         dma_map_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
 }
 
 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
 {
     struct drm_device *dev = etnaviv_obj->base.dev;
     struct sg_table *sgt = etnaviv_obj->sgt;
 
     /*
      * For non-cached buffers, ensure the new pages are clean
      * because display controller, GPU, etc. are not coherent:
      *
      * WARNING: The DMA API does not support concurrent CPU
      * and device access to the memory area.  With BIDIRECTIONAL,
      * we will clean the cache lines which overlap the region,
      * and invalidate all cache lines (partially) contained in
      * the region.
      *
      * If you have dirty data in the overlapping cache lines,
      * that will corrupt the GPU-written data.  If you have
      * written into the remainder of the region, this can
      * discard those writes.
      */
     if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
         dma_unmap_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
 }
 
 /* called with etnaviv_obj->lock held */
 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 {
     struct drm_device *dev = etnaviv_obj->base.dev;
     struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
 
     if (IS_ERR(p)) {
         dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
         return PTR_ERR(p);
     }
 
     etnaviv_obj->pages = p;
 
     return 0;
 }
 
 static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
 {
     if (etnaviv_obj->sgt) {
         etnaviv_gem_scatterlist_unmap(etnaviv_obj);
         sg_free_table(etnaviv_obj->sgt);
         kfree(etnaviv_obj->sgt);
         etnaviv_obj->sgt = NULL;
     }
     if (etnaviv_obj->pages) {
         drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
                   true, false);
 
         etnaviv_obj->pages = NULL;
     }
 }
 
 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 {
     int ret;
 
     lockdep_assert_held(&etnaviv_obj->lock);
 
     if (!etnaviv_obj->pages) {
         ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
         if (ret < 0)
             return ERR_PTR(ret);
     }
 
     if (!etnaviv_obj->sgt) {
         struct drm_device *dev = etnaviv_obj->base.dev;
         int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
         struct sg_table *sgt;
 
         sgt = drm_prime_pages_to_sg(etnaviv_obj->base.dev,
                         etnaviv_obj->pages, npages);
         if (IS_ERR(sgt)) {
             dev_err(dev->dev, "failed to allocate sgt: %ld\n",
                 PTR_ERR(sgt));
             return ERR_CAST(sgt);
         }
 
         etnaviv_obj->sgt = sgt;
 
         etnaviv_gem_scatter_map(etnaviv_obj);
     }
 
     return etnaviv_obj->pages;
 }
 
 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
 {
     lockdep_assert_held(&etnaviv_obj->lock);
     /* when we start tracking the pin count, then do something here */
 }
 
 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
         struct vm_area_struct *vma)
 {
     pgprot_t vm_page_prot;
 
     vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
 
     vm_page_prot = vm_get_page_prot(vma->vm_flags);
 
     if (etnaviv_obj->flags & ETNA_BO_WC) {
         vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
     } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
         vma->vm_page_prot = pgprot_noncached(vm_page_prot);
     } else {
         /*
          * Shunt off cached objs to shmem file so they have their own
          * address_space (so unmap_mapping_range does what we want,
          * in particular in the case of mmap'd dmabufs)
          */
         vma->vm_pgoff = 0;
         vma_set_file(vma, etnaviv_obj->base.filp);
 
         vma->vm_page_prot = vm_page_prot;
     }
 
     return 0;
 }
 
 static int etnaviv_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 {
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 
     return etnaviv_obj->ops->mmap(etnaviv_obj, vma);
 }
 
 static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
 {
     struct vm_area_struct *vma = vmf->vma;
     struct drm_gem_object *obj = vma->vm_private_data;
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
     struct page **pages, *page;
     pgoff_t pgoff;
     int err;
 
     /*
      * Make sure we don't parallel update on a fault, nor move or remove
      * something from beneath our feet.  Note that vmf_insert_page() is
      * specifically coded to take care of this, so we don't have to.
      */
     err = mutex_lock_interruptible(&etnaviv_obj->lock);
     if (err)
         return VM_FAULT_NOPAGE;
     /* make sure we have pages attached now */
     pages = etnaviv_gem_get_pages(etnaviv_obj);
     mutex_unlock(&etnaviv_obj->lock);
 
     if (IS_ERR(pages)) {
         err = PTR_ERR(pages);
         return vmf_error(err);
     }
 
     /* We don't use vmf->pgoff since that has the fake offset: */
     pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 
     page = pages[pgoff];
 
     VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
          page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
 
     return vmf_insert_page(vma, vmf->address, page);
 }
 
 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
 {
     int ret;
 
     /* Make it mmapable */
     ret = drm_gem_create_mmap_offset(obj);
     if (ret)
         dev_err(obj->dev->dev, "could not allocate mmap offset\n");
     else
         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 
     return ret;
 }
 
 static struct etnaviv_vram_mapping *
 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
                  struct etnaviv_iommu_context *context)
 {
     struct etnaviv_vram_mapping *mapping;
 
     list_for_each_entry(mapping, &obj->vram_list, obj_node) {
         if (mapping->context == context)
             return mapping;
     }
 
     return NULL;
 }
 
 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 {
     struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 
     mutex_lock(&etnaviv_obj->lock);
     WARN_ON(mapping->use == 0);
     mapping->use -= 1;
     mutex_unlock(&etnaviv_obj->lock);
 
     drm_gem_object_put(&etnaviv_obj->base);
 }
 
 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
     struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context,
     u64 va)
 {
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
     struct etnaviv_vram_mapping *mapping;
     struct page **pages;
     int ret = 0;
 
     mutex_lock(&etnaviv_obj->lock);
     mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
     if (mapping) {
         /*
          * Holding the object lock prevents the use count changing
          * beneath us.  If the use count is zero, the MMU might be
          * reaping this object, so take the lock and re-check that
          * the MMU owns this mapping to close this race.
          */
         if (mapping->use == 0) {
             mutex_lock(&mmu_context->lock);
             if (mapping->context == mmu_context)
                 mapping->use += 1;
             else
                 mapping = NULL;
             mutex_unlock(&mmu_context->lock);
             if (mapping)
                 goto out;
         } else {
             mapping->use += 1;
             goto out;
         }
     }
 
     pages = etnaviv_gem_get_pages(etnaviv_obj);
     if (IS_ERR(pages)) {
         ret = PTR_ERR(pages);
         goto out;
     }
 
     /*
      * See if we have a reaped vram mapping we can re-use before
      * allocating a fresh mapping.
      */
     mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
     if (!mapping) {
         mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
         if (!mapping) {
             ret = -ENOMEM;
             goto out;
         }
 
         INIT_LIST_HEAD(&mapping->scan_node);
         mapping->object = etnaviv_obj;
     } else {
         list_del(&mapping->obj_node);
     }
 
     mapping->use = 1;
 
     ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
                     mmu_context->global->memory_base,
                     mapping, va);
     if (ret < 0)
         kfree(mapping);
     else
         list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 
 out:
     mutex_unlock(&etnaviv_obj->lock);
 
     if (ret)
         return ERR_PTR(ret);
 
     /* Take a reference on the object */
     drm_gem_object_get(obj);
     return mapping;
 }
 
 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 {
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 
     if (etnaviv_obj->vaddr)
         return etnaviv_obj->vaddr;
 
     mutex_lock(&etnaviv_obj->lock);
     /*
      * Need to check again, as we might have raced with another thread
      * while waiting for the mutex.
      */
     if (!etnaviv_obj->vaddr)
         etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
     mutex_unlock(&etnaviv_obj->lock);
 
     return etnaviv_obj->vaddr;
 }
 
 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 {
     struct page **pages;
 
     lockdep_assert_held(&obj->lock);
 
     pages = etnaviv_gem_get_pages(obj);
     if (IS_ERR(pages))
         return NULL;
 
     return vmap(pages, obj->base.size >> PAGE_SHIFT,
             VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 }
 
 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 {
     if (op & ETNA_PREP_READ)
         return DMA_FROM_DEVICE;
     else if (op & ETNA_PREP_WRITE)
         return DMA_TO_DEVICE;
     else
         return DMA_BIDIRECTIONAL;
 }
 
 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
         struct drm_etnaviv_timespec *timeout)
 {
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
     struct drm_device *dev = obj->dev;
     bool write = !!(op & ETNA_PREP_WRITE);
     int ret;
 
     if (!etnaviv_obj->sgt) {
         void *ret;
 
         mutex_lock(&etnaviv_obj->lock);
         ret = etnaviv_gem_get_pages(etnaviv_obj);
         mutex_unlock(&etnaviv_obj->lock);
         if (IS_ERR(ret))
             return PTR_ERR(ret);
     }
 
     if (op & ETNA_PREP_NOSYNC) {
         if (!dma_resv_test_signaled(obj->resv,
                         dma_resv_usage_rw(write)))
             return -EBUSY;
     } else {
         unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 
         ret = dma_resv_wait_timeout(obj->resv, dma_resv_usage_rw(write),
                         true, remain);
         if (ret <= 0)
             return ret == 0 ? -ETIMEDOUT : ret;
     }
 
     if (etnaviv_obj->flags & ETNA_BO_CACHED) {
         dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt,
                      etnaviv_op_to_dma_dir(op));
         etnaviv_obj->last_cpu_prep_op = op;
     }
 
     return 0;
 }
 
 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 {
     struct drm_device *dev = obj->dev;
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 
     if (etnaviv_obj->flags & ETNA_BO_CACHED) {
         /* fini without a prep is almost certainly a userspace error */
         WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
         dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt,
             etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
         etnaviv_obj->last_cpu_prep_op = 0;
     }
 
     return 0;
 }
 
 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
     struct drm_etnaviv_timespec *timeout)
 {
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 
     return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 }
 
 #ifdef CONFIG_DEBUG_FS
 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 {
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
     struct dma_resv *robj = obj->resv;
     unsigned long off = drm_vma_node_start(&obj->vma_node);
     int r;
 
     seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
             etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
             obj->name, kref_read(&obj->refcount),
             off, etnaviv_obj->vaddr, obj->size);
 
     r = dma_resv_lock(robj, NULL);
     if (r)
         return;
 
     dma_resv_describe(robj, m);
     dma_resv_unlock(robj);
 }
 
 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
     struct seq_file *m)
 {
     struct etnaviv_gem_object *etnaviv_obj;
     int count = 0;
     size_t size = 0;
 
     mutex_lock(&priv->gem_lock);
     list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
         struct drm_gem_object *obj = &etnaviv_obj->base;
 
         seq_puts(m, "   ");
         etnaviv_gem_describe(obj, m);
         count++;
         size += obj->size;
     }
     mutex_unlock(&priv->gem_lock);
 
     seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 }
 #endif
 
 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 {
     vunmap(etnaviv_obj->vaddr);
     put_pages(etnaviv_obj);
 }
 
 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
     .get_pages = etnaviv_gem_shmem_get_pages,
     .release = etnaviv_gem_shmem_release,
     .vmap = etnaviv_gem_vmap_impl,
     .mmap = etnaviv_gem_mmap_obj,
 };
 
 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 {
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
     struct etnaviv_drm_private *priv = obj->dev->dev_private;
     struct etnaviv_vram_mapping *mapping, *tmp;
 
     /* object should not be active */
     WARN_ON(is_active(etnaviv_obj));
 
     mutex_lock(&priv->gem_lock);
     list_del(&etnaviv_obj->gem_node);
     mutex_unlock(&priv->gem_lock);
 
     list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
                  obj_node) {
         struct etnaviv_iommu_context *context = mapping->context;
 
         WARN_ON(mapping->use);
 
         if (context)
             etnaviv_iommu_unmap_gem(context, mapping);
 
         list_del(&mapping->obj_node);
         kfree(mapping);
     }
 
     drm_gem_free_mmap_offset(obj);
     etnaviv_obj->ops->release(etnaviv_obj);
     drm_gem_object_release(obj);
 
     kfree(etnaviv_obj);
 }
 
 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 {
     struct etnaviv_drm_private *priv = dev->dev_private;
     struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 
     mutex_lock(&priv->gem_lock);
     list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
     mutex_unlock(&priv->gem_lock);
 }
 
 static const struct vm_operations_struct vm_ops = {
     .fault = etnaviv_gem_fault,
     .open = drm_gem_vm_open,
     .close = drm_gem_vm_close,
 };
 
 static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
     .free = etnaviv_gem_free_object,
     .pin = etnaviv_gem_prime_pin,
     .unpin = etnaviv_gem_prime_unpin,
     .get_sg_table = etnaviv_gem_prime_get_sg_table,
     .vmap = etnaviv_gem_prime_vmap,
     .mmap = etnaviv_gem_mmap,
     .vm_ops = &vm_ops,
 };
 
 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
     const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
 {
     struct etnaviv_gem_object *etnaviv_obj;
     unsigned sz = sizeof(*etnaviv_obj);
     bool valid = true;
 
     /* validate flags */
     switch (flags & ETNA_BO_CACHE_MASK) {
     case ETNA_BO_UNCACHED:
     case ETNA_BO_CACHED:
     case ETNA_BO_WC:
         break;
     default:
         valid = false;
     }
 
     if (!valid) {
         dev_err(dev->dev, "invalid cache flag: %x\n",
             (flags & ETNA_BO_CACHE_MASK));
         return -EINVAL;
     }
 
     etnaviv_obj = kzalloc(sz, GFP_KERNEL);
     if (!etnaviv_obj)
         return -ENOMEM;
 
     etnaviv_obj->flags = flags;
     etnaviv_obj->ops = ops;
 
     mutex_init(&etnaviv_obj->lock);
     INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 
     *obj = &etnaviv_obj->base;
     (*obj)->funcs = &etnaviv_gem_object_funcs;
 
     return 0;
 }
 
 /* convenience method to construct a GEM buffer object, and userspace handle */
 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
     u32 size, u32 flags, u32 *handle)
 {
     struct etnaviv_drm_private *priv = dev->dev_private;
     struct drm_gem_object *obj = NULL;
     int ret;
 
     size = PAGE_ALIGN(size);
 
     ret = etnaviv_gem_new_impl(dev, size, flags,
                    &etnaviv_gem_shmem_ops, &obj);
     if (ret)
         goto fail;
 
     lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 
     ret = drm_gem_object_init(dev, obj, size);
     if (ret)
         goto fail;
 
     /*
      * Our buffers are kept pinned, so allocating them from the MOVABLE
      * zone is a really bad idea, and conflicts with CMA. See comments
      * above new_inode() why this is required _and_ expected if you're
      * going to pin these pages.
      */
     mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
 
     etnaviv_gem_obj_add(dev, obj);
 
     ret = drm_gem_handle_create(file, obj, handle);
 
     /* drop reference from allocate - handle holds it now */
 fail:
     drm_gem_object_put(obj);
 
     return ret;
 }
 
 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
     const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
 {
     struct drm_gem_object *obj;
     int ret;
 
     ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
     if (ret)
         return ret;
 
     drm_gem_private_object_init(dev, obj, size);
 
     *res = to_etnaviv_bo(obj);
 
     return 0;
 }
 
 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 {
     struct page **pvec = NULL;
     struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
     int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 
     might_lock_read(&current->mm->mmap_lock);
 
     if (userptr->mm != current->mm)
         return -EPERM;
 
     pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
     if (!pvec)
         return -ENOMEM;
 
     do {
         unsigned num_pages = npages - pinned;
         uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
         struct page **pages = pvec + pinned;
 
         ret = pin_user_pages_fast(ptr, num_pages,
                       FOLL_WRITE | FOLL_FORCE | FOLL_LONGTERM,
                       pages);
         if (ret < 0) {
             unpin_user_pages(pvec, pinned);
             kvfree(pvec);
             return ret;
         }
 
         pinned += ret;
 
     } while (pinned < npages);
 
     etnaviv_obj->pages = pvec;
 
     return 0;
 }
 
 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 {
     if (etnaviv_obj->sgt) {
         etnaviv_gem_scatterlist_unmap(etnaviv_obj);
         sg_free_table(etnaviv_obj->sgt);
         kfree(etnaviv_obj->sgt);
     }
     if (etnaviv_obj->pages) {
         int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 
         unpin_user_pages(etnaviv_obj->pages, npages);
         kvfree(etnaviv_obj->pages);
     }
 }
 
 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
         struct vm_area_struct *vma)
 {
     return -EINVAL;
 }
 
 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
     .get_pages = etnaviv_gem_userptr_get_pages,
     .release = etnaviv_gem_userptr_release,
     .vmap = etnaviv_gem_vmap_impl,
     .mmap = etnaviv_gem_userptr_mmap_obj,
 };
 
 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
     uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 {
     struct etnaviv_gem_object *etnaviv_obj;
     int ret;
 
     ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
     if (ret)
         return ret;
 
     lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
 
     etnaviv_obj->userptr.ptr = ptr;
     etnaviv_obj->userptr.mm = current->mm;
     etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 
     etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 
     ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 
     /* drop reference from allocate - handle holds it now */
     drm_gem_object_put(&etnaviv_obj->base);
     return ret;
 }

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