1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2014-2018 Etnaviv Project
6 #include <drm/drm_prime.h>
7 #include <linux/dma-buf.h>
9 #include "etnaviv_drv.h"
10 #include "etnaviv_gem.h"
12 static struct lock_class_key etnaviv_prime_lock_class;
14 struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
16 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
17 int npages = obj->size >> PAGE_SHIFT;
19 if (WARN_ON(!etnaviv_obj->pages)) /* should have already pinned! */
20 return ERR_PTR(-EINVAL);
22 return drm_prime_pages_to_sg(obj->dev, etnaviv_obj->pages, npages);
25 int etnaviv_gem_prime_vmap(struct drm_gem_object *obj, struct dma_buf_map *map)
29 vaddr = etnaviv_gem_vmap(obj);
32 dma_buf_map_set_vaddr(map, vaddr);
37 int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
39 if (!obj->import_attach) {
40 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
42 mutex_lock(&etnaviv_obj->lock);
43 etnaviv_gem_get_pages(etnaviv_obj);
44 mutex_unlock(&etnaviv_obj->lock);
49 void etnaviv_gem_prime_unpin(struct drm_gem_object *obj)
51 if (!obj->import_attach) {
52 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
54 mutex_lock(&etnaviv_obj->lock);
55 etnaviv_gem_put_pages(to_etnaviv_bo(obj));
56 mutex_unlock(&etnaviv_obj->lock);
60 static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj)
62 struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(etnaviv_obj->vaddr);
64 if (etnaviv_obj->vaddr)
65 dma_buf_vunmap(etnaviv_obj->base.import_attach->dmabuf, &map);
67 /* Don't drop the pages for imported dmabuf, as they are not
68 * ours, just free the array we allocated:
70 kvfree(etnaviv_obj->pages);
72 drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt);
75 static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj)
77 struct dma_buf_map map;
80 lockdep_assert_held(&etnaviv_obj->lock);
82 ret = dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf, &map);
88 static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
89 struct vm_area_struct *vma)
91 return dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
94 static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
95 /* .get_pages should never be called */
96 .release = etnaviv_gem_prime_release,
97 .vmap = etnaviv_gem_prime_vmap_impl,
98 .mmap = etnaviv_gem_prime_mmap_obj,
101 struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
102 struct dma_buf_attachment *attach, struct sg_table *sgt)
104 struct etnaviv_gem_object *etnaviv_obj;
105 size_t size = PAGE_ALIGN(attach->dmabuf->size);
108 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
109 &etnaviv_gem_prime_ops, &etnaviv_obj);
113 lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class);
115 npages = size / PAGE_SIZE;
117 etnaviv_obj->sgt = sgt;
118 etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
119 if (!etnaviv_obj->pages) {
124 ret = drm_prime_sg_to_page_array(sgt, etnaviv_obj->pages, npages);
128 etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
130 return &etnaviv_obj->base;
133 drm_gem_object_put(&etnaviv_obj->base);