blob: c15bafb06665f0ec8c788cd1c21d7067dc5a8df3 [file] [log] [blame]
/*
* 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,
};
static int vgem_open(struct drm_device *dev, struct drm_file *file)
{
struct vgem_file *vfile;
int ret;
vfile = kzalloc(sizeof(*vfile), GFP_KERNEL);
if (!vfile)
return -ENOMEM;
file->driver_priv = vfile;
ret = vgem_fence_open(vfile);
if (ret) {
kfree(vfile);
return ret;
}
return 0;
}
static void vgem_preclose(struct drm_device *dev, struct drm_file *file)
{
struct vgem_file *vfile = file->driver_priv;
vgem_fence_close(vfile);
kfree(vfile);
}
/* 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[] = {
DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
};
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));
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,
.open = vgem_open,
.preclose = vgem_preclose,
.gem_free_object_unlocked = vgem_gem_free_object,
.gem_vm_ops = &vgem_gem_vm_ops,
.ioctls = vgem_ioctls,
.num_ioctls = ARRAY_SIZE(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_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL and additional rights");