| /* |
| * Copyright 2012 Red Hat Inc |
| * |
| * 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: |
| * Dave Airlie <airlied@redhat.com> |
| */ |
| #include "drmP.h" |
| #include "i915_drv.h" |
| #include <linux/dma-buf.h> |
| |
| static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
| enum dma_data_direction dir) |
| { |
| struct drm_i915_gem_object *obj = attachment->dmabuf->priv; |
| struct drm_device *dev = obj->base.dev; |
| int npages = obj->base.size / PAGE_SIZE; |
| struct sg_table *sg; |
| int ret; |
| int nents; |
| |
| ret = i915_mutex_lock_interruptible(dev); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| ret = i915_gem_object_get_pages(obj); |
| if (ret) { |
| sg = ERR_PTR(ret); |
| goto out; |
| } |
| |
| /* link the pages into an SG then map the sg */ |
| sg = drm_prime_pages_to_sg(obj->pages, npages); |
| nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); |
| i915_gem_object_pin_pages(obj); |
| |
| out: |
| mutex_unlock(&dev->struct_mutex); |
| return sg; |
| } |
| |
| static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
| struct sg_table *sg, enum dma_data_direction dir) |
| { |
| dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); |
| sg_free_table(sg); |
| kfree(sg); |
| } |
| |
| static void i915_gem_dmabuf_release(struct dma_buf *dma_buf) |
| { |
| struct drm_i915_gem_object *obj = dma_buf->priv; |
| |
| if (obj->base.export_dma_buf == dma_buf) { |
| /* drop the reference on the export fd holds */ |
| obj->base.export_dma_buf = NULL; |
| drm_gem_object_unreference_unlocked(&obj->base); |
| } |
| } |
| |
| static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
| { |
| struct drm_i915_gem_object *obj = dma_buf->priv; |
| struct drm_device *dev = obj->base.dev; |
| int ret; |
| |
| ret = i915_mutex_lock_interruptible(dev); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| if (obj->dma_buf_vmapping) { |
| obj->vmapping_count++; |
| goto out_unlock; |
| } |
| |
| ret = i915_gem_object_get_pages(obj); |
| if (ret) { |
| mutex_unlock(&dev->struct_mutex); |
| return ERR_PTR(ret); |
| } |
| |
| obj->dma_buf_vmapping = vmap(obj->pages, obj->base.size / PAGE_SIZE, 0, PAGE_KERNEL); |
| if (!obj->dma_buf_vmapping) { |
| DRM_ERROR("failed to vmap object\n"); |
| goto out_unlock; |
| } |
| |
| obj->vmapping_count = 1; |
| i915_gem_object_pin_pages(obj); |
| out_unlock: |
| mutex_unlock(&dev->struct_mutex); |
| return obj->dma_buf_vmapping; |
| } |
| |
| static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) |
| { |
| struct drm_i915_gem_object *obj = dma_buf->priv; |
| struct drm_device *dev = obj->base.dev; |
| int ret; |
| |
| ret = i915_mutex_lock_interruptible(dev); |
| if (ret) |
| return; |
| |
| if (--obj->vmapping_count == 0) { |
| vunmap(obj->dma_buf_vmapping); |
| obj->dma_buf_vmapping = NULL; |
| |
| i915_gem_object_unpin_pages(obj); |
| } |
| mutex_unlock(&dev->struct_mutex); |
| } |
| |
| static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
| { |
| return NULL; |
| } |
| |
| static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) |
| { |
| |
| } |
| static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) |
| { |
| return NULL; |
| } |
| |
| static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) |
| { |
| |
| } |
| |
| static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
| { |
| return -EINVAL; |
| } |
| |
| static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction) |
| { |
| struct drm_i915_gem_object *obj = dma_buf->priv; |
| struct drm_device *dev = obj->base.dev; |
| int ret; |
| bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); |
| |
| ret = i915_mutex_lock_interruptible(dev); |
| if (ret) |
| return ret; |
| |
| ret = i915_gem_object_set_to_cpu_domain(obj, write); |
| mutex_unlock(&dev->struct_mutex); |
| return ret; |
| } |
| |
| static const struct dma_buf_ops i915_dmabuf_ops = { |
| .map_dma_buf = i915_gem_map_dma_buf, |
| .unmap_dma_buf = i915_gem_unmap_dma_buf, |
| .release = i915_gem_dmabuf_release, |
| .kmap = i915_gem_dmabuf_kmap, |
| .kmap_atomic = i915_gem_dmabuf_kmap_atomic, |
| .kunmap = i915_gem_dmabuf_kunmap, |
| .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, |
| .mmap = i915_gem_dmabuf_mmap, |
| .vmap = i915_gem_dmabuf_vmap, |
| .vunmap = i915_gem_dmabuf_vunmap, |
| .begin_cpu_access = i915_gem_begin_cpu_access, |
| }; |
| |
| struct dma_buf *i915_gem_prime_export(struct drm_device *dev, |
| struct drm_gem_object *gem_obj, int flags) |
| { |
| struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); |
| |
| return dma_buf_export(obj, &i915_dmabuf_ops, |
| obj->base.size, 0600); |
| } |
| |
| struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
| struct dma_buf *dma_buf) |
| { |
| struct dma_buf_attachment *attach; |
| struct sg_table *sg; |
| struct drm_i915_gem_object *obj; |
| int npages; |
| int size; |
| int ret; |
| |
| /* is this one of own objects? */ |
| if (dma_buf->ops == &i915_dmabuf_ops) { |
| obj = dma_buf->priv; |
| /* is it from our device? */ |
| if (obj->base.dev == dev) { |
| drm_gem_object_reference(&obj->base); |
| return &obj->base; |
| } |
| } |
| |
| /* need to attach */ |
| attach = dma_buf_attach(dma_buf, dev->dev); |
| if (IS_ERR(attach)) |
| return ERR_CAST(attach); |
| |
| sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
| if (IS_ERR(sg)) { |
| ret = PTR_ERR(sg); |
| goto fail_detach; |
| } |
| |
| size = dma_buf->size; |
| npages = size / PAGE_SIZE; |
| |
| obj = kzalloc(sizeof(*obj), GFP_KERNEL); |
| if (obj == NULL) { |
| ret = -ENOMEM; |
| goto fail_unmap; |
| } |
| |
| ret = drm_gem_private_object_init(dev, &obj->base, size); |
| if (ret) { |
| kfree(obj); |
| goto fail_unmap; |
| } |
| |
| obj->sg_table = sg; |
| obj->base.import_attach = attach; |
| |
| return &obj->base; |
| |
| fail_unmap: |
| dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); |
| fail_detach: |
| dma_buf_detach(dma_buf, attach); |
| return ERR_PTR(ret); |
| } |