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