Commit 502e95c6 authored by Zach Reizner's avatar Zach Reizner Committed by Dave Airlie

drm/vgem: implement virtual GEM

This patch implements the virtual GEM driver with PRIME sharing which
allows vgem to import a gem object from other drivers for the purpose
of mmap-ing them to userspace. The mmap is done using the mmap
operation exported by other drivers.

v2: remove platform_device and do not attach to dma bufs
v3: use drm helpers for get/put pages
v4: correct dumb create pitch

Reviewed-by: Rob Clark <robdclark@gmail.com> (v3)
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org> (v3)
Signed-off-by: default avatarAdam Jackson <ajax@redhat.com>
Signed-off-by: default avatarBen Widawsky <ben@bwidawsk.net>
Signed-off-by: default avatarZach Reizner <zachr@google.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 564b687b
......@@ -165,6 +165,15 @@ config DRM_SAVAGE
Choose this option if you have a Savage3D/4/SuperSavage/Pro/Twister
chipset. If M is selected the module will be called savage.
config DRM_VGEM
tristate "Virtual GEM provider"
depends on DRM
help
Choose this option to get a virtual graphics memory manager,
as used by Mesa's software renderer for enhanced performance.
If M is selected the module will be called vgem.
source "drivers/gpu/drm/exynos/Kconfig"
source "drivers/gpu/drm/rockchip/Kconfig"
......
......@@ -48,6 +48,7 @@ obj-$(CONFIG_DRM_SIS) += sis/
obj-$(CONFIG_DRM_SAVAGE)+= savage/
obj-$(CONFIG_DRM_VMWGFX)+= vmwgfx/
obj-$(CONFIG_DRM_VIA) +=via/
obj-$(CONFIG_DRM_VGEM) += vgem/
obj-$(CONFIG_DRM_NOUVEAU) +=nouveau/
obj-$(CONFIG_DRM_EXYNOS) +=exynos/
obj-$(CONFIG_DRM_ROCKCHIP) +=rockchip/
......
ccflags-y := -Iinclude/drm
vgem-y := vgem_drv.o vgem_dma_buf.o
obj-$(CONFIG_DRM_VGEM) += vgem.o
/*
* Copyright © 2012 Intel Corporation
* 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
* 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:
* Ben Widawsky <ben@bwidawsk.net>
*
*/
#include <linux/dma-buf.h>
#include "vgem_drv.h"
struct sg_table *vgem_gem_prime_get_sg_table(struct drm_gem_object *gobj)
{
struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
BUG_ON(obj->pages == NULL);
return drm_prime_pages_to_sg(obj->pages, obj->base.size / PAGE_SIZE);
}
int vgem_gem_prime_pin(struct drm_gem_object *gobj)
{
struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
return vgem_gem_get_pages(obj);
}
void vgem_gem_prime_unpin(struct drm_gem_object *gobj)
{
struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
vgem_gem_put_pages(obj);
}
void *vgem_gem_prime_vmap(struct drm_gem_object *gobj)
{
struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
BUG_ON(obj->pages == NULL);
return vmap(obj->pages, obj->base.size / PAGE_SIZE, 0, PAGE_KERNEL);
}
void vgem_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
vunmap(vaddr);
}
struct drm_gem_object *vgem_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
struct drm_vgem_gem_object *obj = NULL;
int ret;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (obj == NULL) {
ret = -ENOMEM;
goto fail;
}
ret = drm_gem_object_init(dev, &obj->base, dma_buf->size);
if (ret) {
ret = -ENOMEM;
goto fail_free;
}
get_dma_buf(dma_buf);
obj->base.dma_buf = dma_buf;
obj->use_dma_buf = true;
return &obj->base;
fail_free:
kfree(obj);
fail:
return ERR_PTR(ret);
}
/*
* 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;
struct drm_device *dev = obj->base.dev;
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;
mutex_lock(&dev->struct_mutex);
ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address,
obj->pages[page_offset]);
mutex_unlock(&dev->struct_mutex);
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;
}
}
static 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;
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;
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;
mutex_lock(&dev->struct_mutex);
obj = drm_gem_object_lookup(dev, file, handle);
if (!obj) {
ret = -ENOENT;
goto unlock;
}
if (!drm_vma_node_has_offset(&obj->vma_node)) {
ret = drm_gem_create_mmap_offset(obj);
if (ret)
goto unref;
}
BUG_ON(!obj->filp);
obj->filp->private_data = obj;
ret = vgem_gem_get_pages(to_vgem_bo(obj));
if (ret)
goto fail_get_pages;
*offset = drm_vma_node_offset_addr(&obj->vma_node);
goto unref;
fail_get_pages:
drm_gem_free_mmap_offset(obj);
unref:
drm_gem_object_unreference(obj);
unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
int vgem_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *priv = filp->private_data;
struct drm_device *dev = priv->minor->dev;
struct drm_vma_offset_node *node;
struct drm_gem_object *obj;
struct drm_vgem_gem_object *vgem_obj;
int ret = 0;
mutex_lock(&dev->struct_mutex);
node = drm_vma_offset_exact_lookup(dev->vma_offset_manager,
vma->vm_pgoff,
vma_pages(vma));
if (!node) {
ret = -EINVAL;
goto out_unlock;
} else if (!drm_vma_node_is_allowed(node, filp)) {
ret = -EACCES;
goto out_unlock;
}
obj = container_of(node, struct drm_gem_object, vma_node);
vgem_obj = to_vgem_bo(obj);
if (obj->dma_buf && vgem_obj->use_dma_buf) {
ret = dma_buf_mmap(obj->dma_buf, vma, 0);
goto out_unlock;
}
if (!obj->dev->driver->gem_vm_ops) {
ret = -EINVAL;
goto out_unlock;
}
vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_ops = obj->dev->driver->gem_vm_ops;
vma->vm_private_data = vgem_obj;
vma->vm_page_prot =
pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
mutex_unlock(&dev->struct_mutex);
drm_gem_vm_open(vma);
return ret;
out_unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
static struct drm_ioctl_desc vgem_ioctls[] = {
};
static const struct file_operations vgem_driver_fops = {
.owner = THIS_MODULE,
.open = drm_open,
.mmap = vgem_drm_gem_mmap,
.poll = drm_poll,
.read = drm_read,
.unlocked_ioctl = drm_ioctl,
.release = drm_release,
};
static struct drm_driver vgem_driver = {
.driver_features = DRIVER_GEM | DRIVER_PRIME,
.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,
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_export = drm_gem_prime_export,
.gem_prime_import = vgem_gem_prime_import,
.gem_prime_pin = vgem_gem_prime_pin,
.gem_prime_unpin = vgem_gem_prime_unpin,
.gem_prime_get_sg_table = vgem_gem_prime_get_sg_table,
.gem_prime_vmap = vgem_gem_prime_vmap,
.gem_prime_vunmap = vgem_gem_prime_vunmap,
.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;
}
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");
/*
* Copyright © 2012 Intel Corporation
* 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
* 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:
* Ben Widawsky <ben@bwidawsk.net>
*
*/
#ifndef _VGEM_DRV_H_
#define _VGEM_DRV_H_
#include <drm/drmP.h>
#include <drm/drm_gem.h>
#define to_vgem_bo(x) container_of(x, struct drm_vgem_gem_object, base)
struct drm_vgem_gem_object {
struct drm_gem_object base;
struct page **pages;
bool use_dma_buf;
};
/* vgem_drv.c */
extern void vgem_gem_put_pages(struct drm_vgem_gem_object *obj);
extern int vgem_gem_get_pages(struct drm_vgem_gem_object *obj);
/* vgem_dma_buf.c */
extern struct sg_table *vgem_gem_prime_get_sg_table(
struct drm_gem_object *gobj);
extern int vgem_gem_prime_pin(struct drm_gem_object *gobj);
extern void vgem_gem_prime_unpin(struct drm_gem_object *gobj);
extern void *vgem_gem_prime_vmap(struct drm_gem_object *gobj);
extern void vgem_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
extern struct drm_gem_object *vgem_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf);
#endif
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