drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2014-2018 Etnaviv Project
   4  */
   5
   6 #include <drm/drm_prime.h>
   7 #include <linux/dma-buf.h>
   8 #include <linux/module.h>
   9
  10 #include "etnaviv_drv.h"
  11 #include "etnaviv_gem.h"
  12
  13 MODULE_IMPORT_NS("DMA_BUF");
  14
  15 static struct lock_class_key etnaviv_prime_lock_class;
  16
  17 struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
  18 {
  19         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
  20         unsigned int npages = obj->size >> PAGE_SHIFT;
  21
  22         if (WARN_ON(!etnaviv_obj->pages))  /* should have already pinned! */
  23                 return ERR_PTR(-EINVAL);
  24
  25         return drm_prime_pages_to_sg(obj->dev, etnaviv_obj->pages, npages);
  26 }
  27
  28 int etnaviv_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
  29 {
  30         void *vaddr;
  31
  32         vaddr = etnaviv_gem_vmap(obj);
  33         if (!vaddr)
  34                 return -ENOMEM;
  35         iosys_map_set_vaddr(map, vaddr);
  36
  37         return 0;
  38 }
  39
  40 int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
  41 {
  42         if (!obj->import_attach) {
  43                 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
  44
  45                 mutex_lock(&etnaviv_obj->lock);
  46                 etnaviv_gem_get_pages(etnaviv_obj);
  47                 mutex_unlock(&etnaviv_obj->lock);
  48         }
  49         return 0;
  50 }
  51
  52 void etnaviv_gem_prime_unpin(struct drm_gem_object *obj)
  53 {
  54         if (!obj->import_attach) {
  55                 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
  56
  57                 mutex_lock(&etnaviv_obj->lock);
  58                 etnaviv_gem_put_pages(to_etnaviv_bo(obj));
  59                 mutex_unlock(&etnaviv_obj->lock);
  60         }
  61 }
  62
  63 static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj)
  64 {
  65         struct iosys_map map = IOSYS_MAP_INIT_VADDR(etnaviv_obj->vaddr);
  66
  67         if (etnaviv_obj->vaddr)
  68                 dma_buf_vunmap_unlocked(etnaviv_obj->base.import_attach->dmabuf, &map);
  69
  70         /* Don't drop the pages for imported dmabuf, as they are not
  71          * ours, just free the array we allocated:
  72          */
  73         kvfree(etnaviv_obj->pages);
  74
  75         drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt);
  76 }
  77
  78 static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj)
  79 {
  80         struct iosys_map map;
  81         int ret;
  82
  83         lockdep_assert_held(&etnaviv_obj->lock);
  84
  85         ret = dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf, &map);
  86         if (ret)
  87                 return NULL;
  88         return map.vaddr;
  89 }
  90
  91 static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
  92                 struct vm_area_struct *vma)
  93 {
  94         int ret;
  95
  96         ret = dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
  97         if (!ret) {
  98                 /* Drop the reference acquired by drm_gem_mmap_obj(). */
  99                 drm_gem_object_put(&etnaviv_obj->base);
 100         }
 101
 102         return ret;
 103 }
 104
 105 static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
 106         /* .get_pages should never be called */
 107         .release = etnaviv_gem_prime_release,
 108         .vmap = etnaviv_gem_prime_vmap_impl,
 109         .mmap = etnaviv_gem_prime_mmap_obj,
 110 };
 111
 112 struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
 113         struct dma_buf_attachment *attach, struct sg_table *sgt)
 114 {
 115         struct etnaviv_gem_object *etnaviv_obj;
 116         size_t size = PAGE_ALIGN(attach->dmabuf->size);
 117         int ret, npages;
 118
 119         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
 120                                       &etnaviv_gem_prime_ops, &etnaviv_obj);
 121         if (ret < 0)
 122                 return ERR_PTR(ret);
 123
 124         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class);
 125
 126         npages = size / PAGE_SIZE;
 127
 128         etnaviv_obj->sgt = sgt;
 129         etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 130         if (!etnaviv_obj->pages) {
 131                 ret = -ENOMEM;
 132                 goto fail;
 133         }
 134
 135         ret = drm_prime_sg_to_page_array(sgt, etnaviv_obj->pages, npages);
 136         if (ret)
 137                 goto fail;
 138
 139         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 140
 141         return &etnaviv_obj->base;
 142
 143 fail:
 144         drm_gem_object_put(&etnaviv_obj->base);
 145
 146         return ERR_PTR(ret);
 147 }