Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 | /* exynos_drm_dmabuf.c
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* Author: Inki Dae <inki.dae@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <drm/drmP.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_dmabuf.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include <linux/dma-buf.h>
struct exynos_drm_dmabuf_attachment {
struct sg_table sgt;
enum dma_data_direction dir;
bool is_mapped;
};
static struct exynos_drm_gem_obj *dma_buf_to_obj(struct dma_buf *buf)
{
return to_exynos_gem_obj(buf->priv);
}
static int exynos_gem_attach_dma_buf(struct dma_buf *dmabuf,
struct device *dev,
struct dma_buf_attachment *attach)
{
struct exynos_drm_dmabuf_attachment *exynos_attach;
exynos_attach = kzalloc(sizeof(*exynos_attach), GFP_KERNEL);
if (!exynos_attach)
return -ENOMEM;
exynos_attach->dir = DMA_NONE;
attach->priv = exynos_attach;
return 0;
}
static void exynos_gem_detach_dma_buf(struct dma_buf *dmabuf,
struct dma_buf_attachment *attach)
{
struct exynos_drm_dmabuf_attachment *exynos_attach = attach->priv;
struct sg_table *sgt;
if (!exynos_attach)
return;
sgt = &exynos_attach->sgt;
if (exynos_attach->dir != DMA_NONE)
dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
exynos_attach->dir);
sg_free_table(sgt);
kfree(exynos_attach);
attach->priv = NULL;
}
static struct sg_table *
exynos_gem_map_dma_buf(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
{
struct exynos_drm_dmabuf_attachment *exynos_attach = attach->priv;
struct exynos_drm_gem_obj *gem_obj = dma_buf_to_obj(attach->dmabuf);
struct drm_device *dev = gem_obj->base.dev;
struct exynos_drm_gem_buf *buf;
struct scatterlist *rd, *wr;
struct sg_table *sgt = NULL;
unsigned int i;
int nents, ret;
/* just return current sgt if already requested. */
if (exynos_attach->dir == dir && exynos_attach->is_mapped)
return &exynos_attach->sgt;
buf = gem_obj->buffer;
if (!buf) {
DRM_ERROR("buffer is null.\n");
return ERR_PTR(-ENOMEM);
}
sgt = &exynos_attach->sgt;
ret = sg_alloc_table(sgt, buf->sgt->orig_nents, GFP_KERNEL);
if (ret) {
DRM_ERROR("failed to alloc sgt.\n");
return ERR_PTR(-ENOMEM);
}
mutex_lock(&dev->struct_mutex);
rd = buf->sgt->sgl;
wr = sgt->sgl;
for (i = 0; i < sgt->orig_nents; ++i) {
sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
rd = sg_next(rd);
wr = sg_next(wr);
}
if (dir != DMA_NONE) {
nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir);
if (!nents) {
DRM_ERROR("failed to map sgl with iommu.\n");
sg_free_table(sgt);
sgt = ERR_PTR(-EIO);
goto err_unlock;
}
}
exynos_attach->is_mapped = true;
exynos_attach->dir = dir;
attach->priv = exynos_attach;
DRM_DEBUG_PRIME("buffer size = 0x%lx\n", buf->size);
err_unlock:
mutex_unlock(&dev->struct_mutex);
return sgt;
}
static void exynos_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
/* Nothing to do. */
}
static void *exynos_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
unsigned long page_num)
{
/* TODO */
return NULL;
}
static void exynos_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
unsigned long page_num,
void *addr)
{
/* TODO */
}
static void *exynos_gem_dmabuf_kmap(struct dma_buf *dma_buf,
unsigned long page_num)
{
/* TODO */
return NULL;
}
static void exynos_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
unsigned long page_num, void *addr)
{
/* TODO */
}
static int exynos_gem_dmabuf_mmap(struct dma_buf *dma_buf,
struct vm_area_struct *vma)
{
return -ENOTTY;
}
static struct dma_buf_ops exynos_dmabuf_ops = {
.attach = exynos_gem_attach_dma_buf,
.detach = exynos_gem_detach_dma_buf,
.map_dma_buf = exynos_gem_map_dma_buf,
.unmap_dma_buf = exynos_gem_unmap_dma_buf,
.kmap = exynos_gem_dmabuf_kmap,
.kmap_atomic = exynos_gem_dmabuf_kmap_atomic,
.kunmap = exynos_gem_dmabuf_kunmap,
.kunmap_atomic = exynos_gem_dmabuf_kunmap_atomic,
.mmap = exynos_gem_dmabuf_mmap,
.release = drm_gem_dmabuf_release,
};
struct dma_buf *exynos_dmabuf_prime_export(struct drm_device *drm_dev,
struct drm_gem_object *obj, int flags)
{
struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
return dma_buf_export(obj, &exynos_dmabuf_ops,
exynos_gem_obj->base.size, flags);
}
struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
struct dma_buf *dma_buf)
{
struct dma_buf_attachment *attach;
struct sg_table *sgt;
struct scatterlist *sgl;
struct exynos_drm_gem_obj *exynos_gem_obj;
struct exynos_drm_gem_buf *buffer;
int ret;
/* is this one of own objects? */
if (dma_buf->ops == &exynos_dmabuf_ops) {
struct drm_gem_object *obj;
obj = dma_buf->priv;
/* is it from our device? */
if (obj->dev == drm_dev) {
/*
* Importing dmabuf exported from out own gem increases
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(obj);
return obj;
}
}
attach = dma_buf_attach(dma_buf, drm_dev->dev);
if (IS_ERR(attach))
return ERR_PTR(-EINVAL);
get_dma_buf(dma_buf);
sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR_OR_NULL(sgt)) {
ret = PTR_ERR(sgt);
goto err_buf_detach;
}
buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
if (!buffer) {
ret = -ENOMEM;
goto err_unmap_attach;
}
exynos_gem_obj = exynos_drm_gem_init(drm_dev, dma_buf->size);
if (!exynos_gem_obj) {
ret = -ENOMEM;
goto err_free_buffer;
}
sgl = sgt->sgl;
buffer->size = dma_buf->size;
buffer->dma_addr = sg_dma_address(sgl);
if (sgt->nents == 1) {
/* always physically continuous memory if sgt->nents is 1. */
exynos_gem_obj->flags |= EXYNOS_BO_CONTIG;
} else {
/*
* this case could be CONTIG or NONCONTIG type but for now
* sets NONCONTIG.
* TODO. we have to find a way that exporter can notify
* the type of its own buffer to importer.
*/
exynos_gem_obj->flags |= EXYNOS_BO_NONCONTIG;
}
exynos_gem_obj->buffer = buffer;
buffer->sgt = sgt;
exynos_gem_obj->base.import_attach = attach;
DRM_DEBUG_PRIME("dma_addr = 0x%x, size = 0x%lx\n", buffer->dma_addr,
buffer->size);
return &exynos_gem_obj->base;
err_free_buffer:
kfree(buffer);
buffer = NULL;
err_unmap_attach:
dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
err_buf_detach:
dma_buf_detach(dma_buf, attach);
dma_buf_put(dma_buf);
return ERR_PTR(ret);
}
MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM DMABUF Module");
MODULE_LICENSE("GPL");
|