2015-03-04 17:33:41 -07:00
|
|
|
/*
|
|
|
|
* 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
|
|
|
|
|
|
|
|
void vgem_gem_put_pages(struct drm_vgem_gem_object *obj)
|
|
|
|
{
|
|
|
|
drm_gem_put_pages(&obj->base, obj->pages, false, false);
|
|
|
|
obj->pages = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void vgem_gem_free_object(struct drm_gem_object *obj)
|
|
|
|
{
|
|
|
|
struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
|
|
|
|
|
|
|
|
drm_gem_free_mmap_offset(obj);
|
|
|
|
|
|
|
|
if (vgem_obj->use_dma_buf && obj->dma_buf) {
|
|
|
|
dma_buf_put(obj->dma_buf);
|
|
|
|
obj->dma_buf = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
drm_gem_object_release(obj);
|
|
|
|
|
|
|
|
if (vgem_obj->pages)
|
|
|
|
vgem_gem_put_pages(vgem_obj);
|
|
|
|
|
|
|
|
vgem_obj->pages = NULL;
|
|
|
|
|
|
|
|
kfree(vgem_obj);
|
|
|
|
}
|
|
|
|
|
|
|
|
int vgem_gem_get_pages(struct drm_vgem_gem_object *obj)
|
|
|
|
{
|
|
|
|
struct page **pages;
|
|
|
|
|
|
|
|
if (obj->pages || obj->use_dma_buf)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
pages = drm_gem_get_pages(&obj->base);
|
|
|
|
if (IS_ERR(pages)) {
|
|
|
|
return PTR_ERR(pages);
|
|
|
|
}
|
|
|
|
|
|
|
|
obj->pages = pages;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vgem_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
|
|
{
|
|
|
|
struct drm_vgem_gem_object *obj = vma->vm_private_data;
|
|
|
|
loff_t num_pages;
|
|
|
|
pgoff_t page_offset;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/* We don't use vmf->pgoff since that has the fake offset */
|
|
|
|
page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
|
|
|
|
PAGE_SHIFT;
|
|
|
|
|
|
|
|
num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
|
|
|
|
|
|
|
|
if (page_offset > num_pages)
|
|
|
|
return VM_FAULT_SIGBUS;
|
|
|
|
|
|
|
|
ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address,
|
|
|
|
obj->pages[page_offset]);
|
|
|
|
switch (ret) {
|
|
|
|
case 0:
|
|
|
|
return VM_FAULT_NOPAGE;
|
|
|
|
case -ENOMEM:
|
|
|
|
return VM_FAULT_OOM;
|
|
|
|
case -EBUSY:
|
|
|
|
return VM_FAULT_RETRY;
|
|
|
|
case -EFAULT:
|
|
|
|
case -EINVAL:
|
|
|
|
return VM_FAULT_SIGBUS;
|
|
|
|
default:
|
|
|
|
WARN_ON(1);
|
|
|
|
return VM_FAULT_SIGBUS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-09-09 16:39:26 -06:00
|
|
|
static const struct vm_operations_struct vgem_gem_vm_ops = {
|
2015-03-04 17:33:41 -07:00
|
|
|
.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;
|
|
|
|
struct drm_gem_object *gem_object;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
size = roundup(size, PAGE_SIZE);
|
|
|
|
|
|
|
|
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
|
|
|
|
if (!obj)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
gem_object = &obj->base;
|
|
|
|
|
|
|
|
err = drm_gem_object_init(dev, gem_object, size);
|
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
|
2016-03-30 03:40:50 -06:00
|
|
|
err = vgem_gem_get_pages(obj);
|
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
|
2015-03-04 17:33:41 -07:00
|
|
|
err = drm_gem_handle_create(file, gem_object, handle);
|
|
|
|
if (err)
|
|
|
|
goto handle_out;
|
|
|
|
|
|
|
|
drm_gem_object_unreference_unlocked(gem_object);
|
|
|
|
|
|
|
|
return gem_object;
|
|
|
|
|
|
|
|
handle_out:
|
|
|
|
drm_gem_object_release(gem_object);
|
|
|
|
out:
|
|
|
|
kfree(obj);
|
|
|
|
return ERR_PTR(err);
|
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
uint64_t size;
|
|
|
|
uint64_t 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)) {
|
|
|
|
DRM_DEBUG_DRIVER("object creation failed\n");
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
int vgem_gem_dumb_map(struct drm_file *file, struct drm_device *dev,
|
|
|
|
uint32_t handle, uint64_t *offset)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
struct drm_gem_object *obj;
|
|
|
|
|
|
|
|
obj = drm_gem_object_lookup(dev, file, handle);
|
2016-03-30 03:40:51 -06:00
|
|
|
if (!obj)
|
|
|
|
return -ENOENT;
|
2015-03-04 17:33:41 -07:00
|
|
|
|
2016-03-30 03:40:49 -06:00
|
|
|
ret = drm_gem_create_mmap_offset(obj);
|
|
|
|
if (ret)
|
|
|
|
goto unref;
|
2015-03-04 17:33:41 -07:00
|
|
|
|
|
|
|
BUG_ON(!obj->filp);
|
|
|
|
|
|
|
|
obj->filp->private_data = obj;
|
|
|
|
|
|
|
|
*offset = drm_vma_node_offset_addr(&obj->vma_node);
|
|
|
|
|
|
|
|
unref:
|
2016-03-30 03:40:51 -06:00
|
|
|
drm_gem_object_unreference_unlocked(obj);
|
|
|
|
|
2015-03-04 17:33:41 -07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct drm_ioctl_desc vgem_ioctls[] = {
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct file_operations vgem_driver_fops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.open = drm_open,
|
2015-10-15 01:36:23 -06:00
|
|
|
.mmap = drm_gem_mmap,
|
2015-03-04 17:33:41 -07:00
|
|
|
.poll = drm_poll,
|
|
|
|
.read = drm_read,
|
|
|
|
.unlocked_ioctl = drm_ioctl,
|
|
|
|
.release = drm_release,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct drm_driver vgem_driver = {
|
2015-05-21 09:58:30 -06:00
|
|
|
.driver_features = DRIVER_GEM,
|
2015-03-04 17:33:41 -07:00
|
|
|
.gem_free_object = 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,
|
|
|
|
.name = DRIVER_NAME,
|
|
|
|
.desc = DRIVER_DESC,
|
|
|
|
.date = DRIVER_DATE,
|
|
|
|
.major = DRIVER_MAJOR,
|
|
|
|
.minor = DRIVER_MINOR,
|
|
|
|
};
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2015-06-23 08:35:06 -06:00
|
|
|
drm_dev_set_unique(vgem_device, "vgem");
|
|
|
|
|
2015-03-04 17:33:41 -07:00
|
|
|
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");
|