/* * 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); }