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| 1 | +/* |
| 2 | + * Copyright 2012 Red Hat Inc |
| 3 | + * |
| 4 | + * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | + * copy of this software and associated documentation files (the "Software"), |
| 6 | + * to deal in the Software without restriction, including without limitation |
| 7 | + * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | + * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | + * Software is furnished to do so, subject to the following conditions: |
| 10 | + * |
| 11 | + * The above copyright notice and this permission notice (including the next |
| 12 | + * paragraph) shall be included in all copies or substantial portions of the |
| 13 | + * Software. |
| 14 | + * |
| 15 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 21 | + * DEALINGS IN THE SOFTWARE. |
| 22 | + * |
| 23 | + * Authors: |
| 24 | + |
| 25 | + */ |
| 26 | +#include "drmP.h" |
| 27 | +#include "i915_drv.h" |
| 28 | +#include <linux/dma-buf.h> |
| 29 | + |
| 30 | +struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
| 31 | + enum dma_data_direction dir) |
| 32 | +{ |
| 33 | + struct drm_i915_gem_object *obj = attachment->dmabuf->priv; |
| 34 | + struct drm_device *dev = obj->base.dev; |
| 35 | + int npages = obj->base.size / PAGE_SIZE; |
| 36 | + struct sg_table *sg = NULL; |
| 37 | + int ret; |
| 38 | + int nents; |
| 39 | + |
| 40 | + ret = i915_mutex_lock_interruptible(dev); |
| 41 | + if (ret) |
| 42 | + return ERR_PTR(ret); |
| 43 | + |
| 44 | + if (!obj->pages) { |
| 45 | + ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY | __GFP_NOWARN); |
| 46 | + if (ret) |
| 47 | + goto out; |
| 48 | + } |
| 49 | + |
| 50 | + /* link the pages into an SG then map the sg */ |
| 51 | + sg = drm_prime_pages_to_sg(obj->pages, npages); |
| 52 | + nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); |
| 53 | +out: |
| 54 | + mutex_unlock(&dev->struct_mutex); |
| 55 | + return sg; |
| 56 | +} |
| 57 | + |
| 58 | +void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
| 59 | + struct sg_table *sg, enum dma_data_direction dir) |
| 60 | +{ |
| 61 | + dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); |
| 62 | + sg_free_table(sg); |
| 63 | + kfree(sg); |
| 64 | +} |
| 65 | + |
| 66 | +void i915_gem_dmabuf_release(struct dma_buf *dma_buf) |
| 67 | +{ |
| 68 | + struct drm_i915_gem_object *obj = dma_buf->priv; |
| 69 | + |
| 70 | + if (obj->base.export_dma_buf == dma_buf) { |
| 71 | + /* drop the reference on the export fd holds */ |
| 72 | + obj->base.export_dma_buf = NULL; |
| 73 | + drm_gem_object_unreference_unlocked(&obj->base); |
| 74 | + } |
| 75 | +} |
| 76 | + |
| 77 | +static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
| 78 | +{ |
| 79 | + return NULL; |
| 80 | +} |
| 81 | + |
| 82 | +static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) |
| 83 | +{ |
| 84 | + |
| 85 | +} |
| 86 | +static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) |
| 87 | +{ |
| 88 | + return NULL; |
| 89 | +} |
| 90 | + |
| 91 | +static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) |
| 92 | +{ |
| 93 | + |
| 94 | +} |
| 95 | + |
| 96 | +struct dma_buf_ops i915_dmabuf_ops = { |
| 97 | + .map_dma_buf = i915_gem_map_dma_buf, |
| 98 | + .unmap_dma_buf = i915_gem_unmap_dma_buf, |
| 99 | + .release = i915_gem_dmabuf_release, |
| 100 | + .kmap = i915_gem_dmabuf_kmap, |
| 101 | + .kmap_atomic = i915_gem_dmabuf_kmap_atomic, |
| 102 | + .kunmap = i915_gem_dmabuf_kunmap, |
| 103 | + .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, |
| 104 | +}; |
| 105 | + |
| 106 | +struct dma_buf *i915_gem_prime_export(struct drm_device *dev, |
| 107 | + struct drm_gem_object *gem_obj, int flags) |
| 108 | +{ |
| 109 | + struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); |
| 110 | + |
| 111 | + return dma_buf_export(obj, &i915_dmabuf_ops, |
| 112 | + obj->base.size, 0600); |
| 113 | +} |
| 114 | + |
| 115 | +struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
| 116 | + struct dma_buf *dma_buf) |
| 117 | +{ |
| 118 | + struct dma_buf_attachment *attach; |
| 119 | + struct sg_table *sg; |
| 120 | + struct drm_i915_gem_object *obj; |
| 121 | + int npages; |
| 122 | + int size; |
| 123 | + int ret; |
| 124 | + |
| 125 | + /* is this one of own objects? */ |
| 126 | + if (dma_buf->ops == &i915_dmabuf_ops) { |
| 127 | + obj = dma_buf->priv; |
| 128 | + /* is it from our device? */ |
| 129 | + if (obj->base.dev == dev) { |
| 130 | + drm_gem_object_reference(&obj->base); |
| 131 | + return &obj->base; |
| 132 | + } |
| 133 | + } |
| 134 | + |
| 135 | + /* need to attach */ |
| 136 | + attach = dma_buf_attach(dma_buf, dev->dev); |
| 137 | + if (IS_ERR(attach)) |
| 138 | + return ERR_CAST(attach); |
| 139 | + |
| 140 | + sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
| 141 | + if (IS_ERR(sg)) { |
| 142 | + ret = PTR_ERR(sg); |
| 143 | + goto fail_detach; |
| 144 | + } |
| 145 | + |
| 146 | + size = dma_buf->size; |
| 147 | + npages = size / PAGE_SIZE; |
| 148 | + |
| 149 | + obj = kzalloc(sizeof(*obj), GFP_KERNEL); |
| 150 | + if (obj == NULL) { |
| 151 | + ret = -ENOMEM; |
| 152 | + goto fail_unmap; |
| 153 | + } |
| 154 | + |
| 155 | + ret = drm_gem_private_object_init(dev, &obj->base, size); |
| 156 | + if (ret) { |
| 157 | + kfree(obj); |
| 158 | + goto fail_unmap; |
| 159 | + } |
| 160 | + |
| 161 | + obj->sg_table = sg; |
| 162 | + obj->base.import_attach = attach; |
| 163 | + |
| 164 | + return &obj->base; |
| 165 | + |
| 166 | +fail_unmap: |
| 167 | + dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); |
| 168 | +fail_detach: |
| 169 | + dma_buf_detach(dma_buf, attach); |
| 170 | + return ERR_PTR(ret); |
| 171 | +} |
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