148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2014-2018 Etnaviv Project
|
|
*/
|
|
|
|
#include <drm/drm_prime.h>
|
|
#include <linux/dma-buf.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "etnaviv_drv.h"
|
|
#include "etnaviv_gem.h"
|
|
|
|
MODULE_IMPORT_NS(DMA_BUF);
|
|
|
|
static struct lock_class_key etnaviv_prime_lock_class;
|
|
|
|
struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
|
|
{
|
|
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
|
|
int npages = obj->size >> PAGE_SHIFT;
|
|
|
|
if (WARN_ON(!etnaviv_obj->pages)) /* should have already pinned! */
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return drm_prime_pages_to_sg(obj->dev, etnaviv_obj->pages, npages);
|
|
}
|
|
|
|
int etnaviv_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
|
|
{
|
|
void *vaddr;
|
|
|
|
vaddr = etnaviv_gem_vmap(obj);
|
|
if (!vaddr)
|
|
return -ENOMEM;
|
|
iosys_map_set_vaddr(map, vaddr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
|
|
{
|
|
if (!obj->import_attach) {
|
|
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
|
|
|
|
mutex_lock(&etnaviv_obj->lock);
|
|
etnaviv_gem_get_pages(etnaviv_obj);
|
|
mutex_unlock(&etnaviv_obj->lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void etnaviv_gem_prime_unpin(struct drm_gem_object *obj)
|
|
{
|
|
if (!obj->import_attach) {
|
|
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
|
|
|
|
mutex_lock(&etnaviv_obj->lock);
|
|
etnaviv_gem_put_pages(to_etnaviv_bo(obj));
|
|
mutex_unlock(&etnaviv_obj->lock);
|
|
}
|
|
}
|
|
|
|
static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj)
|
|
{
|
|
struct iosys_map map = IOSYS_MAP_INIT_VADDR(etnaviv_obj->vaddr);
|
|
|
|
if (etnaviv_obj->vaddr)
|
|
dma_buf_vunmap_unlocked(etnaviv_obj->base.import_attach->dmabuf, &map);
|
|
|
|
/* Don't drop the pages for imported dmabuf, as they are not
|
|
* ours, just free the array we allocated:
|
|
*/
|
|
kvfree(etnaviv_obj->pages);
|
|
|
|
drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt);
|
|
}
|
|
|
|
static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj)
|
|
{
|
|
struct iosys_map map;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&etnaviv_obj->lock);
|
|
|
|
ret = dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf, &map);
|
|
if (ret)
|
|
return NULL;
|
|
return map.vaddr;
|
|
}
|
|
|
|
static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
int ret;
|
|
|
|
ret = dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
|
|
if (!ret) {
|
|
/* Drop the reference acquired by drm_gem_mmap_obj(). */
|
|
drm_gem_object_put(&etnaviv_obj->base);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
|
|
/* .get_pages should never be called */
|
|
.release = etnaviv_gem_prime_release,
|
|
.vmap = etnaviv_gem_prime_vmap_impl,
|
|
.mmap = etnaviv_gem_prime_mmap_obj,
|
|
};
|
|
|
|
struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
|
|
struct dma_buf_attachment *attach, struct sg_table *sgt)
|
|
{
|
|
struct etnaviv_gem_object *etnaviv_obj;
|
|
size_t size = PAGE_ALIGN(attach->dmabuf->size);
|
|
int ret, npages;
|
|
|
|
ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
|
|
&etnaviv_gem_prime_ops, &etnaviv_obj);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class);
|
|
|
|
npages = size / PAGE_SIZE;
|
|
|
|
etnaviv_obj->sgt = sgt;
|
|
etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
|
|
if (!etnaviv_obj->pages) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
ret = drm_prime_sg_to_page_array(sgt, etnaviv_obj->pages, npages);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
|
|
|
|
return &etnaviv_obj->base;
|
|
|
|
fail:
|
|
drm_gem_object_put(&etnaviv_obj->base);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|