LXR linux/drivers/gpu/drm/etnaviv/etnaviv_gem

   1/*
   2 * Copyright (C) 2013 Red Hat
   3 * Author: Rob Clark <robdclark@gmail.com>
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms of the GNU General Public License version 2 as published by
   7 * the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18#include <linux/dma-buf.h>
  19#include "etnaviv_drv.h"
  20#include "etnaviv_gem.h"
  21
  22
  23struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
  24{
  25        struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
  26        int npages = obj->size >> PAGE_SHIFT;
  27
  28        if (WARN_ON(!etnaviv_obj->pages))  /* should have already pinned! */
  29                return NULL;
  30
  31        return drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
  32}
  33
  34void *etnaviv_gem_prime_vmap(struct drm_gem_object *obj)
  35{
  36        return etnaviv_gem_vmap(obj);
  37}
  38
  39void etnaviv_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
  40{
  41        /* TODO msm_gem_vunmap() */
  42}
  43
  44int etnaviv_gem_prime_mmap(struct drm_gem_object *obj,
  45                           struct vm_area_struct *vma)
  46{
  47        struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
  48        int ret;
  49
  50        ret = drm_gem_mmap_obj(obj, obj->size, vma);
  51        if (ret < 0)
  52                return ret;
  53
  54        return etnaviv_obj->ops->mmap(etnaviv_obj, vma);
  55}
  56
  57int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
  58{
  59        if (!obj->import_attach) {
  60                struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
  61
  62                mutex_lock(&etnaviv_obj->lock);
  63                etnaviv_gem_get_pages(etnaviv_obj);
  64                mutex_unlock(&etnaviv_obj->lock);
  65        }
  66        return 0;
  67}
  68
  69void etnaviv_gem_prime_unpin(struct drm_gem_object *obj)
  70{
  71        if (!obj->import_attach) {
  72                struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
  73
  74                mutex_lock(&etnaviv_obj->lock);
  75                etnaviv_gem_put_pages(to_etnaviv_bo(obj));
  76                mutex_unlock(&etnaviv_obj->lock);
  77        }
  78}
  79
  80static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj)
  81{
  82        if (etnaviv_obj->vaddr)
  83                dma_buf_vunmap(etnaviv_obj->base.import_attach->dmabuf,
  84                               etnaviv_obj->vaddr);
  85
  86        /* Don't drop the pages for imported dmabuf, as they are not
  87         * ours, just free the array we allocated:
  88         */
  89        if (etnaviv_obj->pages)
  90                kvfree(etnaviv_obj->pages);
  91
  92        drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt);
  93}
  94
  95static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj)
  96{
  97        lockdep_assert_held(&etnaviv_obj->lock);
  98
  99        return dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf);
 100}
 101
 102static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 103                struct vm_area_struct *vma)
 104{
 105        return dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
 106}
 107
 108static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
 109        /* .get_pages should never be called */
 110        .release = etnaviv_gem_prime_release,
 111        .vmap = etnaviv_gem_prime_vmap_impl,
 112        .mmap = etnaviv_gem_prime_mmap_obj,
 113};
 114
 115struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
 116        struct dma_buf_attachment *attach, struct sg_table *sgt)
 117{
 118        struct etnaviv_gem_object *etnaviv_obj;
 119        size_t size = PAGE_ALIGN(attach->dmabuf->size);
 120        int ret, npages;
 121
 122        ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
 123                                      attach->dmabuf->resv,
 124                                      &etnaviv_gem_prime_ops, &etnaviv_obj);
 125        if (ret < 0)
 126                return ERR_PTR(ret);
 127
 128        npages = size / PAGE_SIZE;
 129
 130        etnaviv_obj->sgt = sgt;
 131        etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 132        if (!etnaviv_obj->pages) {
 133                ret = -ENOMEM;
 134                goto fail;
 135        }
 136
 137        ret = drm_prime_sg_to_page_addr_arrays(sgt, etnaviv_obj->pages,
 138                                               NULL, npages);
 139        if (ret)
 140                goto fail;
 141
 142        ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 143        if (ret)
 144                goto fail;
 145
 146        return &etnaviv_obj->base;
 147
 148fail:
 149        drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 150
 151        return ERR_PTR(ret);
 152}
 153
 154struct reservation_object *etnaviv_gem_prime_res_obj(struct drm_gem_object *obj)
 155{
 156        struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 157
 158        return etnaviv_obj->resv;
 159}
 160