diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_dmabuf.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_dmabuf.c | 337 |
1 files changed, 0 insertions, 337 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c deleted file mode 100644 index 5a101a9462d8..000000000000 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ /dev/null @@ -1,337 +0,0 @@ -/* - * 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 "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_flush_map(obj); - i915_gem_object_unpin_map(obj); -} - -static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) -{ - struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); - struct page *page; - - if (page_num >= obj->base.size >> PAGE_SHIFT) - return NULL; - - if (!i915_gem_object_has_struct_page(obj)) - return NULL; - - if (i915_gem_object_pin_pages(obj)) - return NULL; - - /* Synchronisation is left to the caller (via .begin_cpu_access()) */ - page = i915_gem_object_get_page(obj, page_num); - if (IS_ERR(page)) - goto err_unpin; - - return kmap(page); - -err_unpin: - i915_gem_object_unpin_pages(obj); - return NULL; -} - -static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) -{ - struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); - - kunmap(virt_to_page(addr)); - i915_gem_object_unpin_pages(obj); -} - -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 = call_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, - .map = i915_gem_dmabuf_kmap, - .unmap = i915_gem_dmabuf_kunmap, - .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 int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) -{ - struct sg_table *pages; - unsigned int sg_page_sizes; - - pages = dma_buf_map_attachment(obj->base.import_attach, - DMA_BIDIRECTIONAL); - if (IS_ERR(pages)) - return PTR_ERR(pages); - - sg_page_sizes = i915_sg_page_sizes(pages->sgl); - - __i915_gem_object_set_pages(obj, pages, sg_page_sizes); - - return 0; -} - -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(); - 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->read_domains = I915_GEM_DOMAIN_GTT; - obj->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 |