Daniel Vetter | 1286ff7 | 2012-05-10 15:25:09 +0200 | [diff] [blame] | 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 | * Dave Airlie <airlied@redhat.com> |
| 25 | */ |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame^] | 26 | #include <drm/drmP.h> |
Daniel Vetter | 1286ff7 | 2012-05-10 15:25:09 +0200 | [diff] [blame] | 27 | #include "i915_drv.h" |
| 28 | #include <linux/dma-buf.h> |
| 29 | |
Dave Airlie | 6a101cb | 2012-05-23 14:09:32 +0100 | [diff] [blame] | 30 | static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
Daniel Vetter | 1286ff7 | 2012-05-10 15:25:09 +0200 | [diff] [blame] | 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 | |
Dave Airlie | 6a101cb | 2012-05-23 14:09:32 +0100 | [diff] [blame] | 58 | static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
Daniel Vetter | 1286ff7 | 2012-05-10 15:25:09 +0200 | [diff] [blame] | 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 | |
Dave Airlie | 6a101cb | 2012-05-23 14:09:32 +0100 | [diff] [blame] | 66 | static void i915_gem_dmabuf_release(struct dma_buf *dma_buf) |
Daniel Vetter | 1286ff7 | 2012-05-10 15:25:09 +0200 | [diff] [blame] | 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 | |
Dave Airlie | 9a70cc2 | 2012-05-22 13:09:21 +0100 | [diff] [blame] | 77 | static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
| 78 | { |
| 79 | struct drm_i915_gem_object *obj = dma_buf->priv; |
| 80 | struct drm_device *dev = obj->base.dev; |
| 81 | int ret; |
| 82 | |
| 83 | ret = i915_mutex_lock_interruptible(dev); |
| 84 | if (ret) |
| 85 | return ERR_PTR(ret); |
| 86 | |
| 87 | if (obj->dma_buf_vmapping) { |
| 88 | obj->vmapping_count++; |
| 89 | goto out_unlock; |
| 90 | } |
| 91 | |
| 92 | if (!obj->pages) { |
| 93 | ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY | __GFP_NOWARN); |
| 94 | if (ret) { |
| 95 | mutex_unlock(&dev->struct_mutex); |
| 96 | return ERR_PTR(ret); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | obj->dma_buf_vmapping = vmap(obj->pages, obj->base.size / PAGE_SIZE, 0, PAGE_KERNEL); |
| 101 | if (!obj->dma_buf_vmapping) { |
| 102 | DRM_ERROR("failed to vmap object\n"); |
| 103 | goto out_unlock; |
| 104 | } |
| 105 | |
| 106 | obj->vmapping_count = 1; |
| 107 | out_unlock: |
| 108 | mutex_unlock(&dev->struct_mutex); |
| 109 | return obj->dma_buf_vmapping; |
| 110 | } |
| 111 | |
| 112 | static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) |
| 113 | { |
| 114 | struct drm_i915_gem_object *obj = dma_buf->priv; |
| 115 | struct drm_device *dev = obj->base.dev; |
| 116 | int ret; |
| 117 | |
| 118 | ret = i915_mutex_lock_interruptible(dev); |
| 119 | if (ret) |
| 120 | return; |
| 121 | |
| 122 | --obj->vmapping_count; |
| 123 | if (obj->vmapping_count == 0) { |
| 124 | vunmap(obj->dma_buf_vmapping); |
| 125 | obj->dma_buf_vmapping = NULL; |
| 126 | } |
| 127 | mutex_unlock(&dev->struct_mutex); |
| 128 | } |
| 129 | |
Daniel Vetter | 1286ff7 | 2012-05-10 15:25:09 +0200 | [diff] [blame] | 130 | static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
| 131 | { |
| 132 | return NULL; |
| 133 | } |
| 134 | |
| 135 | static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) |
| 136 | { |
| 137 | |
| 138 | } |
| 139 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) |
| 140 | { |
| 141 | return NULL; |
| 142 | } |
| 143 | |
| 144 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) |
| 145 | { |
| 146 | |
| 147 | } |
| 148 | |
Dave Airlie | 2dad9d4 | 2012-05-29 15:11:22 +0100 | [diff] [blame] | 149 | static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
| 150 | { |
| 151 | return -EINVAL; |
| 152 | } |
| 153 | |
Dave Airlie | 6a101cb | 2012-05-23 14:09:32 +0100 | [diff] [blame] | 154 | static const struct dma_buf_ops i915_dmabuf_ops = { |
Daniel Vetter | 1286ff7 | 2012-05-10 15:25:09 +0200 | [diff] [blame] | 155 | .map_dma_buf = i915_gem_map_dma_buf, |
| 156 | .unmap_dma_buf = i915_gem_unmap_dma_buf, |
| 157 | .release = i915_gem_dmabuf_release, |
| 158 | .kmap = i915_gem_dmabuf_kmap, |
| 159 | .kmap_atomic = i915_gem_dmabuf_kmap_atomic, |
| 160 | .kunmap = i915_gem_dmabuf_kunmap, |
| 161 | .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, |
Dave Airlie | 2dad9d4 | 2012-05-29 15:11:22 +0100 | [diff] [blame] | 162 | .mmap = i915_gem_dmabuf_mmap, |
Dave Airlie | 9a70cc2 | 2012-05-22 13:09:21 +0100 | [diff] [blame] | 163 | .vmap = i915_gem_dmabuf_vmap, |
| 164 | .vunmap = i915_gem_dmabuf_vunmap, |
Daniel Vetter | 1286ff7 | 2012-05-10 15:25:09 +0200 | [diff] [blame] | 165 | }; |
| 166 | |
| 167 | struct dma_buf *i915_gem_prime_export(struct drm_device *dev, |
| 168 | struct drm_gem_object *gem_obj, int flags) |
| 169 | { |
| 170 | struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); |
| 171 | |
| 172 | return dma_buf_export(obj, &i915_dmabuf_ops, |
| 173 | obj->base.size, 0600); |
| 174 | } |
| 175 | |
| 176 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
| 177 | struct dma_buf *dma_buf) |
| 178 | { |
| 179 | struct dma_buf_attachment *attach; |
| 180 | struct sg_table *sg; |
| 181 | struct drm_i915_gem_object *obj; |
| 182 | int npages; |
| 183 | int size; |
| 184 | int ret; |
| 185 | |
| 186 | /* is this one of own objects? */ |
| 187 | if (dma_buf->ops == &i915_dmabuf_ops) { |
| 188 | obj = dma_buf->priv; |
| 189 | /* is it from our device? */ |
| 190 | if (obj->base.dev == dev) { |
| 191 | drm_gem_object_reference(&obj->base); |
| 192 | return &obj->base; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /* need to attach */ |
| 197 | attach = dma_buf_attach(dma_buf, dev->dev); |
| 198 | if (IS_ERR(attach)) |
| 199 | return ERR_CAST(attach); |
| 200 | |
| 201 | sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
| 202 | if (IS_ERR(sg)) { |
| 203 | ret = PTR_ERR(sg); |
| 204 | goto fail_detach; |
| 205 | } |
| 206 | |
| 207 | size = dma_buf->size; |
| 208 | npages = size / PAGE_SIZE; |
| 209 | |
| 210 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); |
| 211 | if (obj == NULL) { |
| 212 | ret = -ENOMEM; |
| 213 | goto fail_unmap; |
| 214 | } |
| 215 | |
| 216 | ret = drm_gem_private_object_init(dev, &obj->base, size); |
| 217 | if (ret) { |
| 218 | kfree(obj); |
| 219 | goto fail_unmap; |
| 220 | } |
| 221 | |
| 222 | obj->sg_table = sg; |
| 223 | obj->base.import_attach = attach; |
| 224 | |
| 225 | return &obj->base; |
| 226 | |
| 227 | fail_unmap: |
| 228 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); |
| 229 | fail_detach: |
| 230 | dma_buf_detach(dma_buf, attach); |
| 231 | return ERR_PTR(ret); |
| 232 | } |