blob: 864439a214c83c32d663e49bf05c50cd96f3ffb3 [file] [log] [blame]
/*
* Copyright 2012 Red Hat Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Dave Airlie <airlied@redhat.com>
*/
#include <linux/dma-buf.h>
#include <linux/reservation.h>
#include <drm/drmP.h>
#include "i915_drv.h"
static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf)
{
return to_intel_bo(buf->priv);
}
static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment,
enum dma_data_direction dir)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
struct sg_table *st;
struct scatterlist *src, *dst;
int ret, i;
ret = i915_gem_object_pin_pages(obj);
if (ret)
goto err;
/* Copy sg so that we make an independent mapping */
st = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
if (st == NULL) {
ret = -ENOMEM;
goto err_unpin_pages;
}
ret = sg_alloc_table(st, obj->mm.pages->nents, GFP_KERNEL);
if (ret)
goto err_free;
src = obj->mm.pages->sgl;
dst = st->sgl;
for (i = 0; i < obj->mm.pages->nents; i++) {
sg_set_page(dst, sg_page(src), src->length, 0);
dst = sg_next(dst);
src = sg_next(src);
}
if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
ret = -ENOMEM;
goto err_free_sg;
}
return st;
err_free_sg:
sg_free_table(st);
err_free:
kfree(st);
err_unpin_pages:
i915_gem_object_unpin_pages(obj);
err:
return ERR_PTR(ret);
}
static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
struct sg_table *sg,
enum dma_data_direction dir)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
sg_free_table(sg);
kfree(sg);
i915_gem_object_unpin_pages(obj);
}
static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
return i915_gem_object_pin_map(obj, I915_MAP_WB);
}
static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
i915_gem_object_unpin_map(obj);
}
static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
{
return NULL;
}
static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
}
static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
struct page *page;
if (page_num >= obj->base.size >> PAGE_SHIFT)
return NULL;
if (!i915_gem_object_has_struct_page(obj))
return NULL;
if (i915_gem_object_pin_pages(obj))
return NULL;
/* Synchronisation is left to the caller (via .begin_cpu_access()) */
page = i915_gem_object_get_page(obj, page_num);
if (IS_ERR(page))
goto err_unpin;
return kmap(page);
err_unpin:
i915_gem_object_unpin_pages(obj);
return NULL;
}
static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
kunmap(virt_to_page(addr));
i915_gem_object_unpin_pages(obj);
}
static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
int ret;
if (obj->base.size < vma->vm_end - vma->vm_start)
return -EINVAL;
if (!obj->base.filp)
return -ENODEV;
ret = call_mmap(obj->base.filp, vma);
if (ret)
return ret;
fput(vma->vm_file);
vma->vm_file = get_file(obj->base.filp);
return 0;
}
static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
struct drm_device *dev = obj->base.dev;
bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE);
int err;
err = i915_gem_object_pin_pages(obj);
if (err)
return err;
err = i915_mutex_lock_interruptible(dev);
if (err)
goto out;
err = i915_gem_object_set_to_cpu_domain(obj, write);
mutex_unlock(&dev->struct_mutex);
out:
i915_gem_object_unpin_pages(obj);
return err;
}
static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
struct drm_device *dev = obj->base.dev;
int err;
err = i915_gem_object_pin_pages(obj);
if (err)
return err;
err = i915_mutex_lock_interruptible(dev);
if (err)
goto out;
err = i915_gem_object_set_to_gtt_domain(obj, false);
mutex_unlock(&dev->struct_mutex);
out:
i915_gem_object_unpin_pages(obj);
return err;
}
static const struct dma_buf_ops i915_dmabuf_ops = {
.map_dma_buf = i915_gem_map_dma_buf,
.unmap_dma_buf = i915_gem_unmap_dma_buf,
.release = drm_gem_dmabuf_release,
.map = i915_gem_dmabuf_kmap,
.map_atomic = i915_gem_dmabuf_kmap_atomic,
.unmap = i915_gem_dmabuf_kunmap,
.unmap_atomic = i915_gem_dmabuf_kunmap_atomic,
.mmap = i915_gem_dmabuf_mmap,
.vmap = i915_gem_dmabuf_vmap,
.vunmap = i915_gem_dmabuf_vunmap,
.begin_cpu_access = i915_gem_begin_cpu_access,
.end_cpu_access = i915_gem_end_cpu_access,
};
struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *gem_obj, int flags)
{
struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
exp_info.ops = &i915_dmabuf_ops;
exp_info.size = gem_obj->size;
exp_info.flags = flags;
exp_info.priv = gem_obj;
exp_info.resv = obj->resv;
if (obj->ops->dmabuf_export) {
int ret = obj->ops->dmabuf_export(obj);
if (ret)
return ERR_PTR(ret);
}
return drm_gem_dmabuf_export(dev, &exp_info);
}
static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
{
struct sg_table *pages;
unsigned int sg_page_sizes;
pages = dma_buf_map_attachment(obj->base.import_attach,
DMA_BIDIRECTIONAL);
if (IS_ERR(pages))
return PTR_ERR(pages);
sg_page_sizes = i915_sg_page_sizes(pages->sgl);
__i915_gem_object_set_pages(obj, pages, sg_page_sizes);
return 0;
}
static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
dma_buf_unmap_attachment(obj->base.import_attach, pages,
DMA_BIDIRECTIONAL);
}
static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = {
.get_pages = i915_gem_object_get_pages_dmabuf,
.put_pages = i915_gem_object_put_pages_dmabuf,
};
struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
struct dma_buf_attachment *attach;
struct drm_i915_gem_object *obj;
int ret;
/* is this one of own objects? */
if (dma_buf->ops == &i915_dmabuf_ops) {
obj = dma_buf_to_obj(dma_buf);
/* is it from our device? */
if (obj->base.dev == dev) {
/*
* Importing dmabuf exported from out own gem increases
* refcount on gem itself instead of f_count of dmabuf.
*/
return &i915_gem_object_get(obj)->base;
}
}
/* need to attach */
attach = dma_buf_attach(dma_buf, dev->dev);
if (IS_ERR(attach))
return ERR_CAST(attach);
get_dma_buf(dma_buf);
obj = i915_gem_object_alloc(to_i915(dev));
if (obj == NULL) {
ret = -ENOMEM;
goto fail_detach;
}
drm_gem_private_object_init(dev, &obj->base, dma_buf->size);
i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops);
obj->base.import_attach = attach;
obj->resv = dma_buf->resv;
/* We use GTT as shorthand for a coherent domain, one that is
* neither in the GPU cache nor in the CPU cache, where all
* writes are immediately visible in memory. (That's not strictly
* true, but it's close! There are internal buffers such as the
* write-combined buffer or a delay through the chipset for GTT
* writes that do require us to treat GTT as a separate cache domain.)
*/
obj->base.read_domains = I915_GEM_DOMAIN_GTT;
obj->base.write_domain = 0;
return &obj->base;
fail_detach:
dma_buf_detach(dma_buf, attach);
dma_buf_put(dma_buf);
return ERR_PTR(ret);
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/mock_dmabuf.c"
#include "selftests/i915_gem_dmabuf.c"
#endif