| /* |
| * Copyright (C) 2015 Etnaviv Project |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published by |
| * the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/spinlock.h> |
| #include <linux/shmem_fs.h> |
| #include <linux/sched/mm.h> |
| #include <linux/sched/task.h> |
| |
| #include "etnaviv_drv.h" |
| #include "etnaviv_gem.h" |
| #include "etnaviv_gpu.h" |
| #include "etnaviv_mmu.h" |
| |
| 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_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); |
| } |
| |
| 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_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); |
| } |
| |
| /* 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->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_PFNMAP; |
| vma->vm_flags |= VM_MIXEDMAP; |
| |
| 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) |
| */ |
| fput(vma->vm_file); |
| get_file(etnaviv_obj->base.filp); |
| vma->vm_pgoff = 0; |
| vma->vm_file = etnaviv_obj->base.filp; |
| |
| vma->vm_page_prot = vm_page_prot; |
| } |
| |
| return 0; |
| } |
| |
| int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma) |
| { |
| struct etnaviv_gem_object *obj; |
| int ret; |
| |
| ret = drm_gem_mmap(filp, vma); |
| if (ret) { |
| DBG("mmap failed: %d", ret); |
| return ret; |
| } |
| |
| obj = to_etnaviv_bo(vma->vm_private_data); |
| return obj->ops->mmap(obj, vma); |
| } |
| |
| int 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 ret; |
| |
| /* |
| * Make sure we don't parallel update on a fault, nor move or remove |
| * something from beneath our feet. Note that vm_insert_page() is |
| * specifically coded to take care of this, so we don't have to. |
| */ |
| ret = mutex_lock_interruptible(&etnaviv_obj->lock); |
| if (ret) |
| goto out; |
| |
| /* make sure we have pages attached now */ |
| pages = etnaviv_gem_get_pages(etnaviv_obj); |
| mutex_unlock(&etnaviv_obj->lock); |
| |
| if (IS_ERR(pages)) { |
| ret = PTR_ERR(pages); |
| goto out; |
| } |
| |
| /* 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); |
| |
| ret = vm_insert_page(vma, vmf->address, page); |
| |
| out: |
| switch (ret) { |
| case -EAGAIN: |
| case 0: |
| case -ERESTARTSYS: |
| case -EINTR: |
| case -EBUSY: |
| /* |
| * EBUSY is ok: this just means that another thread |
| * already did the job. |
| */ |
| return VM_FAULT_NOPAGE; |
| case -ENOMEM: |
| return VM_FAULT_OOM; |
| default: |
| return VM_FAULT_SIGBUS; |
| } |
| } |
| |
| 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 *mmu) |
| { |
| struct etnaviv_vram_mapping *mapping; |
| |
| list_for_each_entry(mapping, &obj->vram_list, obj_node) { |
| if (mapping->mmu == mmu) |
| return mapping; |
| } |
| |
| return NULL; |
| } |
| |
| void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping) |
| { |
| struct etnaviv_gem_object *etnaviv_obj = mapping->object; |
| |
| drm_gem_object_get(&etnaviv_obj->base); |
| |
| mutex_lock(&etnaviv_obj->lock); |
| WARN_ON(mapping->use == 0); |
| mapping->use += 1; |
| mutex_unlock(&etnaviv_obj->lock); |
| } |
| |
| 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_unlocked(&etnaviv_obj->base); |
| } |
| |
| struct etnaviv_vram_mapping *etnaviv_gem_mapping_get( |
| struct drm_gem_object *obj, struct etnaviv_gpu *gpu) |
| { |
| 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, gpu->mmu); |
| 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(&gpu->mmu->lock); |
| if (mapping->mmu == gpu->mmu) |
| mapping->use += 1; |
| else |
| mapping = NULL; |
| mutex_unlock(&gpu->mmu->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->mmu = gpu->mmu; |
| mapping->use = 1; |
| |
| ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base, |
| mapping); |
| 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 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 (!reservation_object_test_signaled_rcu(etnaviv_obj->resv, |
| write)) |
| return -EBUSY; |
| } else { |
| unsigned long remain = etnaviv_timeout_to_jiffies(timeout); |
| |
| ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv, |
| write, true, remain); |
| if (ret <= 0) |
| return ret == 0 ? -ETIMEDOUT : ret; |
| } |
| |
| if (etnaviv_obj->flags & ETNA_BO_CACHED) { |
| dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl, |
| etnaviv_obj->sgt->nents, |
| 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_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl, |
| etnaviv_obj->sgt->nents, |
| 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 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_fence(struct dma_fence *fence, |
| const char *type, struct seq_file *m) |
| { |
| if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) |
| seq_printf(m, "\t%9s: %s %s seq %u\n", |
| type, |
| fence->ops->get_driver_name(fence), |
| fence->ops->get_timeline_name(fence), |
| fence->seqno); |
| } |
| |
| 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 reservation_object *robj = etnaviv_obj->resv; |
| struct reservation_object_list *fobj; |
| struct dma_fence *fence; |
| unsigned long off = drm_vma_node_start(&obj->vma_node); |
| |
| 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); |
| |
| rcu_read_lock(); |
| fobj = rcu_dereference(robj->fence); |
| if (fobj) { |
| unsigned int i, shared_count = fobj->shared_count; |
| |
| for (i = 0; i < shared_count; i++) { |
| fence = rcu_dereference(fobj->shared[i]); |
| etnaviv_gem_describe_fence(fence, "Shared", m); |
| } |
| } |
| |
| fence = rcu_dereference(robj->fence_excl); |
| if (fence) |
| etnaviv_gem_describe_fence(fence, "Exclusive", m); |
| rcu_read_unlock(); |
| } |
| |
| 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 *mmu = mapping->mmu; |
| |
| WARN_ON(mapping->use); |
| |
| if (mmu) |
| etnaviv_iommu_unmap_gem(mmu, mapping); |
| |
| list_del(&mapping->obj_node); |
| kfree(mapping); |
| } |
| |
| drm_gem_free_mmap_offset(obj); |
| etnaviv_obj->ops->release(etnaviv_obj); |
| if (etnaviv_obj->resv == &etnaviv_obj->_resv) |
| reservation_object_fini(&etnaviv_obj->_resv); |
| drm_gem_object_release(obj); |
| |
| kfree(etnaviv_obj); |
| } |
| |
| int 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); |
| |
| return 0; |
| } |
| |
| static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags, |
| struct reservation_object *robj, 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; |
| if (robj) { |
| etnaviv_obj->resv = robj; |
| } else { |
| etnaviv_obj->resv = &etnaviv_obj->_resv; |
| reservation_object_init(&etnaviv_obj->_resv); |
| } |
| |
| mutex_init(&etnaviv_obj->lock); |
| INIT_LIST_HEAD(&etnaviv_obj->vram_list); |
| |
| *obj = &etnaviv_obj->base; |
| |
| return 0; |
| } |
| |
| static struct drm_gem_object *__etnaviv_gem_new(struct drm_device *dev, |
| u32 size, u32 flags) |
| { |
| struct drm_gem_object *obj = NULL; |
| int ret; |
| |
| size = PAGE_ALIGN(size); |
| |
| ret = etnaviv_gem_new_impl(dev, size, flags, NULL, |
| &etnaviv_gem_shmem_ops, &obj); |
| if (ret) |
| goto fail; |
| |
| ret = drm_gem_object_init(dev, obj, size); |
| if (ret == 0) { |
| struct address_space *mapping; |
| |
| /* |
| * Our buffers are kept pinned, so allocating them |
| * from the MOVABLE zone is a really bad idea, and |
| * conflicts with CMA. See coments above new_inode() |
| * why this is required _and_ expected if you're |
| * going to pin these pages. |
| */ |
| mapping = obj->filp->f_mapping; |
| mapping_set_gfp_mask(mapping, GFP_HIGHUSER | |
| __GFP_RETRY_MAYFAIL | __GFP_NOWARN); |
| } |
| |
| if (ret) |
| goto fail; |
| |
| return obj; |
| |
| fail: |
| drm_gem_object_put_unlocked(obj); |
| return ERR_PTR(ret); |
| } |
| |
| /* 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 drm_gem_object *obj; |
| int ret; |
| |
| obj = __etnaviv_gem_new(dev, size, flags); |
| if (IS_ERR(obj)) |
| return PTR_ERR(obj); |
| |
| ret = etnaviv_gem_obj_add(dev, obj); |
| if (ret < 0) { |
| drm_gem_object_put_unlocked(obj); |
| return ret; |
| } |
| |
| ret = drm_gem_handle_create(file, obj, handle); |
| |
| /* drop reference from allocate - handle holds it now */ |
| drm_gem_object_put_unlocked(obj); |
| |
| return ret; |
| } |
| |
| struct drm_gem_object *etnaviv_gem_new(struct drm_device *dev, |
| u32 size, u32 flags) |
| { |
| struct drm_gem_object *obj; |
| int ret; |
| |
| obj = __etnaviv_gem_new(dev, size, flags); |
| if (IS_ERR(obj)) |
| return obj; |
| |
| ret = etnaviv_gem_obj_add(dev, obj); |
| if (ret < 0) { |
| drm_gem_object_put_unlocked(obj); |
| return ERR_PTR(ret); |
| } |
| |
| return obj; |
| } |
| |
| int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags, |
| struct reservation_object *robj, 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, robj, ops, &obj); |
| if (ret) |
| return ret; |
| |
| drm_gem_private_object_init(dev, obj, size); |
| |
| *res = to_etnaviv_bo(obj); |
| |
| return 0; |
| } |
| |
| struct get_pages_work { |
| struct work_struct work; |
| struct mm_struct *mm; |
| struct task_struct *task; |
| struct etnaviv_gem_object *etnaviv_obj; |
| }; |
| |
| static struct page **etnaviv_gem_userptr_do_get_pages( |
| struct etnaviv_gem_object *etnaviv_obj, struct mm_struct *mm, struct task_struct *task) |
| { |
| int ret = 0, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT; |
| struct page **pvec; |
| uintptr_t ptr; |
| unsigned int flags = 0; |
| |
| pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); |
| if (!pvec) |
| return ERR_PTR(-ENOMEM); |
| |
| if (!etnaviv_obj->userptr.ro) |
| flags |= FOLL_WRITE; |
| |
| pinned = 0; |
| ptr = etnaviv_obj->userptr.ptr; |
| |
| down_read(&mm->mmap_sem); |
| while (pinned < npages) { |
| ret = get_user_pages_remote(task, mm, ptr, npages - pinned, |
| flags, pvec + pinned, NULL, NULL); |
| if (ret < 0) |
| break; |
| |
| ptr += ret * PAGE_SIZE; |
| pinned += ret; |
| } |
| up_read(&mm->mmap_sem); |
| |
| if (ret < 0) { |
| release_pages(pvec, pinned); |
| kvfree(pvec); |
| return ERR_PTR(ret); |
| } |
| |
| return pvec; |
| } |
| |
| static void __etnaviv_gem_userptr_get_pages(struct work_struct *_work) |
| { |
| struct get_pages_work *work = container_of(_work, typeof(*work), work); |
| struct etnaviv_gem_object *etnaviv_obj = work->etnaviv_obj; |
| struct page **pvec; |
| |
| pvec = etnaviv_gem_userptr_do_get_pages(etnaviv_obj, work->mm, work->task); |
| |
| mutex_lock(&etnaviv_obj->lock); |
| if (IS_ERR(pvec)) { |
| etnaviv_obj->userptr.work = ERR_CAST(pvec); |
| } else { |
| etnaviv_obj->userptr.work = NULL; |
| etnaviv_obj->pages = pvec; |
| } |
| |
| mutex_unlock(&etnaviv_obj->lock); |
| drm_gem_object_put_unlocked(&etnaviv_obj->base); |
| |
| mmput(work->mm); |
| put_task_struct(work->task); |
| kfree(work); |
| } |
| |
| static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj) |
| { |
| struct page **pvec = NULL; |
| struct get_pages_work *work; |
| struct mm_struct *mm; |
| int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT; |
| |
| if (etnaviv_obj->userptr.work) { |
| if (IS_ERR(etnaviv_obj->userptr.work)) { |
| ret = PTR_ERR(etnaviv_obj->userptr.work); |
| etnaviv_obj->userptr.work = NULL; |
| } else { |
| ret = -EAGAIN; |
| } |
| return ret; |
| } |
| |
| mm = get_task_mm(etnaviv_obj->userptr.task); |
| pinned = 0; |
| if (mm == current->mm) { |
| pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); |
| if (!pvec) { |
| mmput(mm); |
| return -ENOMEM; |
| } |
| |
| pinned = __get_user_pages_fast(etnaviv_obj->userptr.ptr, npages, |
| !etnaviv_obj->userptr.ro, pvec); |
| if (pinned < 0) { |
| kvfree(pvec); |
| mmput(mm); |
| return pinned; |
| } |
| |
| if (pinned == npages) { |
| etnaviv_obj->pages = pvec; |
| mmput(mm); |
| return 0; |
| } |
| } |
| |
| release_pages(pvec, pinned); |
| kvfree(pvec); |
| |
| work = kmalloc(sizeof(*work), GFP_KERNEL); |
| if (!work) { |
| mmput(mm); |
| return -ENOMEM; |
| } |
| |
| get_task_struct(current); |
| drm_gem_object_get(&etnaviv_obj->base); |
| |
| work->mm = mm; |
| work->task = current; |
| work->etnaviv_obj = etnaviv_obj; |
| |
| etnaviv_obj->userptr.work = &work->work; |
| INIT_WORK(&work->work, __etnaviv_gem_userptr_get_pages); |
| |
| etnaviv_queue_work(etnaviv_obj->base.dev, &work->work); |
| |
| return -EAGAIN; |
| } |
| |
| 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; |
| |
| release_pages(etnaviv_obj->pages, npages); |
| kvfree(etnaviv_obj->pages); |
| } |
| put_task_struct(etnaviv_obj->userptr.task); |
| } |
| |
| 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, NULL, |
| &etnaviv_gem_userptr_ops, &etnaviv_obj); |
| if (ret) |
| return ret; |
| |
| etnaviv_obj->userptr.ptr = ptr; |
| etnaviv_obj->userptr.task = current; |
| etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE); |
| get_task_struct(current); |
| |
| ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base); |
| if (ret) |
| goto unreference; |
| |
| ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle); |
| unreference: |
| /* drop reference from allocate - handle holds it now */ |
| drm_gem_object_put_unlocked(&etnaviv_obj->base); |
| return ret; |
| } |