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+/*
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+ * Copyright 2012 Red Hat Inc
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a
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+ * copy of this software and associated documentation files (the "Software"),
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+ * to deal in the Software without restriction, including without limitation
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+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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+ * and/or sell copies of the Software, and to permit persons to whom the
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+ * Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice (including the next
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+ * paragraph) shall be included in all copies or substantial portions of the
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+ * Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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+ * DEALINGS IN THE SOFTWARE.
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+ *
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+ * Authors:
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+ * Dave Airlie <airlied@redhat.com>
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+ */
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+#include "drmP.h"
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+#include "i915_drv.h"
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+#include <linux/dma-buf.h>
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+
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+struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment,
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+ enum dma_data_direction dir)
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+{
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+ struct drm_i915_gem_object *obj = attachment->dmabuf->priv;
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+ struct drm_device *dev = obj->base.dev;
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+ int npages = obj->base.size / PAGE_SIZE;
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+ struct sg_table *sg = NULL;
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+ int ret;
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+ int nents;
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+
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+ ret = i915_mutex_lock_interruptible(dev);
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+ if (ret)
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+ return ERR_PTR(ret);
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+
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+ if (!obj->pages) {
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+ ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY | __GFP_NOWARN);
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+ if (ret)
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+ goto out;
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+ }
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+
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+ /* link the pages into an SG then map the sg */
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+ sg = drm_prime_pages_to_sg(obj->pages, npages);
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+ nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
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+out:
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+ mutex_unlock(&dev->struct_mutex);
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+ return sg;
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+}
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+
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+void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
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+ struct sg_table *sg, enum dma_data_direction dir)
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+{
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+ dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
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+ sg_free_table(sg);
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+ kfree(sg);
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+}
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+
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+void i915_gem_dmabuf_release(struct dma_buf *dma_buf)
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+{
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+ struct drm_i915_gem_object *obj = dma_buf->priv;
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+
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+ if (obj->base.export_dma_buf == dma_buf) {
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+ /* drop the reference on the export fd holds */
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+ obj->base.export_dma_buf = NULL;
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+ drm_gem_object_unreference_unlocked(&obj->base);
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+ }
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+}
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+
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+static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
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+{
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+ return NULL;
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+}
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+
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+static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
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+{
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+
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+}
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+static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
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+{
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+ return NULL;
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+}
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+
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+static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
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+{
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+
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+}
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+
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+struct dma_buf_ops i915_dmabuf_ops = {
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+ .map_dma_buf = i915_gem_map_dma_buf,
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+ .unmap_dma_buf = i915_gem_unmap_dma_buf,
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+ .release = i915_gem_dmabuf_release,
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+ .kmap = i915_gem_dmabuf_kmap,
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+ .kmap_atomic = i915_gem_dmabuf_kmap_atomic,
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+ .kunmap = i915_gem_dmabuf_kunmap,
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+ .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic,
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+};
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+
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+struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
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+ struct drm_gem_object *gem_obj, int flags)
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+{
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+ struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
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+
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+ return dma_buf_export(obj, &i915_dmabuf_ops,
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+ obj->base.size, 0600);
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+}
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+
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+struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
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+ struct dma_buf *dma_buf)
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+{
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+ struct dma_buf_attachment *attach;
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+ struct sg_table *sg;
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+ struct drm_i915_gem_object *obj;
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+ int npages;
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+ int size;
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+ int ret;
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+
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+ /* is this one of own objects? */
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+ if (dma_buf->ops == &i915_dmabuf_ops) {
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+ obj = dma_buf->priv;
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+ /* is it from our device? */
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+ if (obj->base.dev == dev) {
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+ drm_gem_object_reference(&obj->base);
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+ return &obj->base;
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+ }
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+ }
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+
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+ /* need to attach */
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+ attach = dma_buf_attach(dma_buf, dev->dev);
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+ if (IS_ERR(attach))
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+ return ERR_CAST(attach);
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+
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+ sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
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+ if (IS_ERR(sg)) {
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+ ret = PTR_ERR(sg);
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+ goto fail_detach;
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+ }
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+
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+ size = dma_buf->size;
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+ npages = size / PAGE_SIZE;
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+
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+ obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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+ if (obj == NULL) {
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+ ret = -ENOMEM;
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+ goto fail_unmap;
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+ }
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+
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+ ret = drm_gem_private_object_init(dev, &obj->base, size);
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+ if (ret) {
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+ kfree(obj);
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+ goto fail_unmap;
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+ }
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+
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+ obj->sg_table = sg;
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+ obj->base.import_attach = attach;
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+
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+ return &obj->base;
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+
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+fail_unmap:
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+ dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
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+fail_detach:
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+ dma_buf_detach(dma_buf, attach);
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+ return ERR_PTR(ret);
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+}
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Daniel Vetter