![Chris Wilson](/assets/img/avatar_default.png)
Enable the standard GEM dma-buf interface provided by the DRM core, but only for exporting the VGEM object. This allows passing around the VGEM objects created from the dumb interface and using them as sources elsewhere. Creating a VGEM object for a foriegn handle is not supported. v2: With additional completeness. v3: Need to clear the CPU cache upon exporting the dma-addresses. v4: Use drm_gem_put_pages() as well. v5: Use drm_prime_pages_to_sg() Testcase: igt/vgem_basic/dmabuf-* Testcase: igt/prime_vgem Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Sean Paul <seanpaul@chromium.org> Cc: Zach Reizner <zachr@google.com> Acked-by: Zach Reizner <zachr@google.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1468242488-1505-3-git-send-email-chris@chris-wilson.co.uk
333 lines
7.8 KiB
C
333 lines
7.8 KiB
C
/*
|
|
* Copyright 2011 Red Hat, Inc.
|
|
* Copyright © 2014 The Chromium OS Authors
|
|
*
|
|
* 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
|
|
* on the rights to use, copy, modify, merge, publish, distribute, sub
|
|
* license, and/or sell copies of the Software, and to permit persons to whom
|
|
* them 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 MERCHANTIBILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS 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:
|
|
* Adam Jackson <ajax@redhat.com>
|
|
* Ben Widawsky <ben@bwidawsk.net>
|
|
*/
|
|
|
|
/**
|
|
* This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's
|
|
* software renderer and the X server for efficient buffer sharing.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/ramfs.h>
|
|
#include <linux/shmem_fs.h>
|
|
#include <linux/dma-buf.h>
|
|
#include "vgem_drv.h"
|
|
|
|
#define DRIVER_NAME "vgem"
|
|
#define DRIVER_DESC "Virtual GEM provider"
|
|
#define DRIVER_DATE "20120112"
|
|
#define DRIVER_MAJOR 1
|
|
#define DRIVER_MINOR 0
|
|
|
|
static void vgem_gem_free_object(struct drm_gem_object *obj)
|
|
{
|
|
struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
|
|
|
|
drm_gem_object_release(obj);
|
|
kfree(vgem_obj);
|
|
}
|
|
|
|
static int vgem_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct drm_vgem_gem_object *obj = vma->vm_private_data;
|
|
/* We don't use vmf->pgoff since that has the fake offset */
|
|
unsigned long vaddr = (unsigned long)vmf->virtual_address;
|
|
struct page *page;
|
|
|
|
page = shmem_read_mapping_page(file_inode(obj->base.filp)->i_mapping,
|
|
(vaddr - vma->vm_start) >> PAGE_SHIFT);
|
|
if (!IS_ERR(page)) {
|
|
vmf->page = page;
|
|
return 0;
|
|
} else switch (PTR_ERR(page)) {
|
|
case -ENOSPC:
|
|
case -ENOMEM:
|
|
return VM_FAULT_OOM;
|
|
case -EBUSY:
|
|
return VM_FAULT_RETRY;
|
|
case -EFAULT:
|
|
case -EINVAL:
|
|
return VM_FAULT_SIGBUS;
|
|
default:
|
|
WARN_ON_ONCE(PTR_ERR(page));
|
|
return VM_FAULT_SIGBUS;
|
|
}
|
|
}
|
|
|
|
static const struct vm_operations_struct vgem_gem_vm_ops = {
|
|
.fault = vgem_gem_fault,
|
|
.open = drm_gem_vm_open,
|
|
.close = drm_gem_vm_close,
|
|
};
|
|
|
|
/* ioctls */
|
|
|
|
static struct drm_gem_object *vgem_gem_create(struct drm_device *dev,
|
|
struct drm_file *file,
|
|
unsigned int *handle,
|
|
unsigned long size)
|
|
{
|
|
struct drm_vgem_gem_object *obj;
|
|
int ret;
|
|
|
|
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
|
|
if (!obj)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE));
|
|
if (ret)
|
|
goto err_free;
|
|
|
|
ret = drm_gem_handle_create(file, &obj->base, handle);
|
|
drm_gem_object_unreference_unlocked(&obj->base);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return &obj->base;
|
|
|
|
err_free:
|
|
kfree(obj);
|
|
err:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
|
|
struct drm_mode_create_dumb *args)
|
|
{
|
|
struct drm_gem_object *gem_object;
|
|
u64 pitch, size;
|
|
|
|
pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
|
|
size = args->height * pitch;
|
|
if (size == 0)
|
|
return -EINVAL;
|
|
|
|
gem_object = vgem_gem_create(dev, file, &args->handle, size);
|
|
if (IS_ERR(gem_object))
|
|
return PTR_ERR(gem_object);
|
|
|
|
args->size = gem_object->size;
|
|
args->pitch = pitch;
|
|
|
|
DRM_DEBUG_DRIVER("Created object of size %lld\n", size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vgem_gem_dumb_map(struct drm_file *file, struct drm_device *dev,
|
|
uint32_t handle, uint64_t *offset)
|
|
{
|
|
struct drm_gem_object *obj;
|
|
int ret;
|
|
|
|
obj = drm_gem_object_lookup(file, handle);
|
|
if (!obj)
|
|
return -ENOENT;
|
|
|
|
if (!obj->filp) {
|
|
ret = -EINVAL;
|
|
goto unref;
|
|
}
|
|
|
|
ret = drm_gem_create_mmap_offset(obj);
|
|
if (ret)
|
|
goto unref;
|
|
|
|
*offset = drm_vma_node_offset_addr(&obj->vma_node);
|
|
unref:
|
|
drm_gem_object_unreference_unlocked(obj);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct drm_ioctl_desc vgem_ioctls[] = {
|
|
};
|
|
|
|
static int vgem_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
unsigned long flags = vma->vm_flags;
|
|
int ret;
|
|
|
|
ret = drm_gem_mmap(filp, vma);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Keep the WC mmaping set by drm_gem_mmap() but our pages
|
|
* are ordinary and not special.
|
|
*/
|
|
vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP;
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations vgem_driver_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = drm_open,
|
|
.mmap = vgem_mmap,
|
|
.poll = drm_poll,
|
|
.read = drm_read,
|
|
.unlocked_ioctl = drm_ioctl,
|
|
.release = drm_release,
|
|
};
|
|
|
|
static int vgem_prime_pin(struct drm_gem_object *obj)
|
|
{
|
|
long n_pages = obj->size >> PAGE_SHIFT;
|
|
struct page **pages;
|
|
|
|
/* Flush the object from the CPU cache so that importers can rely
|
|
* on coherent indirect access via the exported dma-address.
|
|
*/
|
|
pages = drm_gem_get_pages(obj);
|
|
if (IS_ERR(pages))
|
|
return PTR_ERR(pages);
|
|
|
|
drm_clflush_pages(pages, n_pages);
|
|
drm_gem_put_pages(obj, pages, true, false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj)
|
|
{
|
|
struct sg_table *st;
|
|
struct page **pages;
|
|
|
|
pages = drm_gem_get_pages(obj);
|
|
if (IS_ERR(pages))
|
|
return ERR_CAST(pages);
|
|
|
|
st = drm_prime_pages_to_sg(pages, obj->size >> PAGE_SHIFT);
|
|
drm_gem_put_pages(obj, pages, false, false);
|
|
|
|
return st;
|
|
}
|
|
|
|
static void *vgem_prime_vmap(struct drm_gem_object *obj)
|
|
{
|
|
long n_pages = obj->size >> PAGE_SHIFT;
|
|
struct page **pages;
|
|
void *addr;
|
|
|
|
pages = drm_gem_get_pages(obj);
|
|
if (IS_ERR(pages))
|
|
return NULL;
|
|
|
|
addr = vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL_IO));
|
|
drm_gem_put_pages(obj, pages, false, false);
|
|
|
|
return addr;
|
|
}
|
|
|
|
static void vgem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
|
|
{
|
|
vunmap(vaddr);
|
|
}
|
|
|
|
static int vgem_prime_mmap(struct drm_gem_object *obj,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
int ret;
|
|
|
|
if (obj->size < vma->vm_end - vma->vm_start)
|
|
return -EINVAL;
|
|
|
|
if (!obj->filp)
|
|
return -ENODEV;
|
|
|
|
ret = obj->filp->f_op->mmap(obj->filp, vma);
|
|
if (ret)
|
|
return ret;
|
|
|
|
fput(vma->vm_file);
|
|
vma->vm_file = get_file(obj->filp);
|
|
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct drm_driver vgem_driver = {
|
|
.driver_features = DRIVER_GEM | DRIVER_PRIME,
|
|
.gem_free_object_unlocked = vgem_gem_free_object,
|
|
.gem_vm_ops = &vgem_gem_vm_ops,
|
|
.ioctls = vgem_ioctls,
|
|
.fops = &vgem_driver_fops,
|
|
|
|
.dumb_create = vgem_gem_dumb_create,
|
|
.dumb_map_offset = vgem_gem_dumb_map,
|
|
|
|
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
|
|
.gem_prime_pin = vgem_prime_pin,
|
|
.gem_prime_export = drm_gem_prime_export,
|
|
.gem_prime_get_sg_table = vgem_prime_get_sg_table,
|
|
.gem_prime_vmap = vgem_prime_vmap,
|
|
.gem_prime_vunmap = vgem_prime_vunmap,
|
|
.gem_prime_mmap = vgem_prime_mmap,
|
|
|
|
.name = DRIVER_NAME,
|
|
.desc = DRIVER_DESC,
|
|
.date = DRIVER_DATE,
|
|
.major = DRIVER_MAJOR,
|
|
.minor = DRIVER_MINOR,
|
|
};
|
|
|
|
static struct drm_device *vgem_device;
|
|
|
|
static int __init vgem_init(void)
|
|
{
|
|
int ret;
|
|
|
|
vgem_device = drm_dev_alloc(&vgem_driver, NULL);
|
|
if (!vgem_device) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = drm_dev_register(vgem_device, 0);
|
|
if (ret)
|
|
goto out_unref;
|
|
|
|
return 0;
|
|
|
|
out_unref:
|
|
drm_dev_unref(vgem_device);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit vgem_exit(void)
|
|
{
|
|
drm_dev_unregister(vgem_device);
|
|
drm_dev_unref(vgem_device);
|
|
}
|
|
|
|
module_init(vgem_init);
|
|
module_exit(vgem_exit);
|
|
|
|
MODULE_AUTHOR("Red Hat, Inc.");
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL and additional rights");
|