| /* |
| * 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 <linux/dma-buf.h> |
| #include <linux/reservation.h> |
| |
| #include <drm/drmP.h> |
| |
| #include "i915_drv.h" |
| |
| static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf) |
| { |
| return to_intel_bo(buf->priv); |
| } |
| |
| 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 = dma_buf_to_obj(attachment->dmabuf); |
| struct sg_table *st; |
| struct scatterlist *src, *dst; |
| int ret, i; |
| |
| ret = i915_gem_object_pin_pages(obj); |
| if (ret) |
| goto err; |
| |
| /* Copy sg so that we make an independent mapping */ |
| st = kmalloc(sizeof(struct sg_table), GFP_KERNEL); |
| if (st == NULL) { |
| ret = -ENOMEM; |
| goto err_unpin_pages; |
| } |
| |
| ret = sg_alloc_table(st, obj->mm.pages->nents, GFP_KERNEL); |
| if (ret) |
| goto err_free; |
| |
| src = obj->mm.pages->sgl; |
| dst = st->sgl; |
| for (i = 0; i < obj->mm.pages->nents; i++) { |
| sg_set_page(dst, sg_page(src), src->length, 0); |
| dst = sg_next(dst); |
| src = sg_next(src); |
| } |
| |
| if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) { |
| ret = -ENOMEM; |
| goto err_free_sg; |
| } |
| |
| return st; |
| |
| err_free_sg: |
| sg_free_table(st); |
| err_free: |
| kfree(st); |
| err_unpin_pages: |
| i915_gem_object_unpin_pages(obj); |
| err: |
| return ERR_PTR(ret); |
| } |
| |
| static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
| struct sg_table *sg, |
| enum dma_data_direction dir) |
| { |
| struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); |
| |
| dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); |
| sg_free_table(sg); |
| kfree(sg); |
| |
| i915_gem_object_unpin_pages(obj); |
| } |
| |
| static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
| { |
| struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
| |
| return i915_gem_object_pin_map(obj, I915_MAP_WB); |
| } |
| |
| static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) |
| { |
| struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
| |
| i915_gem_object_unpin_map(obj); |
| } |
| |
| 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) |
| { |
| struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
| int ret; |
| |
| if (obj->base.size < vma->vm_end - vma->vm_start) |
| return -EINVAL; |
| |
| if (!obj->base.filp) |
| return -ENODEV; |
| |
| ret = obj->base.filp->f_op->mmap(obj->base.filp, vma); |
| if (ret) |
| return ret; |
| |
| fput(vma->vm_file); |
| vma->vm_file = get_file(obj->base.filp); |
| |
| return 0; |
| } |
| |
| static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) |
| { |
| struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
| struct drm_device *dev = obj->base.dev; |
| bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); |
| int err; |
| |
| err = i915_gem_object_pin_pages(obj); |
| if (err) |
| return err; |
| |
| err = i915_mutex_lock_interruptible(dev); |
| if (err) |
| goto out; |
| |
| err = i915_gem_object_set_to_cpu_domain(obj, write); |
| mutex_unlock(&dev->struct_mutex); |
| |
| out: |
| i915_gem_object_unpin_pages(obj); |
| return err; |
| } |
| |
| static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) |
| { |
| struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
| struct drm_device *dev = obj->base.dev; |
| int err; |
| |
| err = i915_gem_object_pin_pages(obj); |
| if (err) |
| return err; |
| |
| err = i915_mutex_lock_interruptible(dev); |
| if (err) |
| goto out; |
| |
| err = i915_gem_object_set_to_gtt_domain(obj, false); |
| mutex_unlock(&dev->struct_mutex); |
| |
| out: |
| i915_gem_object_unpin_pages(obj); |
| return err; |
| } |
| |
| 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 = drm_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, |
| .end_cpu_access = i915_gem_end_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); |
| DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
| |
| exp_info.ops = &i915_dmabuf_ops; |
| exp_info.size = gem_obj->size; |
| exp_info.flags = flags; |
| exp_info.priv = gem_obj; |
| exp_info.resv = obj->resv; |
| |
| if (obj->ops->dmabuf_export) { |
| int ret = obj->ops->dmabuf_export(obj); |
| if (ret) |
| return ERR_PTR(ret); |
| } |
| |
| return drm_gem_dmabuf_export(dev, &exp_info); |
| } |
| |
| static struct sg_table * |
| i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) |
| { |
| return dma_buf_map_attachment(obj->base.import_attach, |
| DMA_BIDIRECTIONAL); |
| } |
| |
| static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj, |
| struct sg_table *pages) |
| { |
| dma_buf_unmap_attachment(obj->base.import_attach, pages, |
| DMA_BIDIRECTIONAL); |
| } |
| |
| static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = { |
| .get_pages = i915_gem_object_get_pages_dmabuf, |
| .put_pages = i915_gem_object_put_pages_dmabuf, |
| }; |
| |
| struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
| struct dma_buf *dma_buf) |
| { |
| struct dma_buf_attachment *attach; |
| struct drm_i915_gem_object *obj; |
| int ret; |
| |
| /* is this one of own objects? */ |
| if (dma_buf->ops == &i915_dmabuf_ops) { |
| obj = dma_buf_to_obj(dma_buf); |
| /* is it from our device? */ |
| if (obj->base.dev == dev) { |
| /* |
| * Importing dmabuf exported from out own gem increases |
| * refcount on gem itself instead of f_count of dmabuf. |
| */ |
| return &i915_gem_object_get(obj)->base; |
| } |
| } |
| |
| /* need to attach */ |
| attach = dma_buf_attach(dma_buf, dev->dev); |
| if (IS_ERR(attach)) |
| return ERR_CAST(attach); |
| |
| get_dma_buf(dma_buf); |
| |
| obj = i915_gem_object_alloc(to_i915(dev)); |
| if (obj == NULL) { |
| ret = -ENOMEM; |
| goto fail_detach; |
| } |
| |
| drm_gem_private_object_init(dev, &obj->base, dma_buf->size); |
| i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops); |
| obj->base.import_attach = attach; |
| obj->resv = dma_buf->resv; |
| |
| /* We use GTT as shorthand for a coherent domain, one that is |
| * neither in the GPU cache nor in the CPU cache, where all |
| * writes are immediately visible in memory. (That's not strictly |
| * true, but it's close! There are internal buffers such as the |
| * write-combined buffer or a delay through the chipset for GTT |
| * writes that do require us to treat GTT as a separate cache domain.) |
| */ |
| obj->base.read_domains = I915_GEM_DOMAIN_GTT; |
| obj->base.write_domain = 0; |
| |
| return &obj->base; |
| |
| fail_detach: |
| dma_buf_detach(dma_buf, attach); |
| dma_buf_put(dma_buf); |
| |
| return ERR_PTR(ret); |
| } |
| |
| #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) |
| #include "selftests/mock_dmabuf.c" |
| #include "selftests/i915_gem_dmabuf.c" |
| #endif |