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linux-next/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
Lucas Stach 54f09288f9 drm/etnaviv: change return type of etnaviv_gem_obj_add to void
This function never fails, as it does nothing more than adding the GEM
object to the global device list. Making this explicit through the void
return type allows to drop some unnecessary error handling.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
2018-01-02 17:07:41 +01:00

161 lines
4.2 KiB
C

/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/dma-buf.h>
#include "etnaviv_drv.h"
#include "etnaviv_gem.h"
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 NULL;
return drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
}
void *etnaviv_gem_prime_vmap(struct drm_gem_object *obj)
{
return etnaviv_gem_vmap(obj);
}
void etnaviv_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
/* TODO msm_gem_vunmap() */
}
int etnaviv_gem_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
int ret;
ret = drm_gem_mmap_obj(obj, obj->size, vma);
if (ret < 0)
return ret;
return etnaviv_obj->ops->mmap(etnaviv_obj, vma);
}
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)
{
if (etnaviv_obj->vaddr)
dma_buf_vunmap(etnaviv_obj->base.import_attach->dmabuf,
etnaviv_obj->vaddr);
/* Don't drop the pages for imported dmabuf, as they are not
* ours, just free the array we allocated:
*/
if (etnaviv_obj->pages)
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)
{
lockdep_assert_held(&etnaviv_obj->lock);
return dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf);
}
static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
struct vm_area_struct *vma)
{
return dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
}
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,
attach->dmabuf->resv,
&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_addr_arrays(sgt, etnaviv_obj->pages,
NULL, npages);
if (ret)
goto fail;
etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
return &etnaviv_obj->base;
fail:
drm_gem_object_put_unlocked(&etnaviv_obj->base);
return ERR_PTR(ret);
}
struct reservation_object *etnaviv_gem_prime_res_obj(struct drm_gem_object *obj)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
return etnaviv_obj->resv;
}