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.
Reviewed-by: Stéphane Marchesin <marcheu at chromium.org>
Signed-off-by: Adam Jackson <ajax at redhat.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Zach Reizner <zachr at google.com>
---
drivers/gpu/drm/Kconfig | 9 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/vgem/Makefile | 4 +
drivers/gpu/drm/vgem/vgem_dma_buf.c | 169 +++++++++++++++
drivers/gpu/drm/vgem/vgem_drv.c | 407 ++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/vgem/vgem_drv.h | 62 ++++++
6 files changed, 652 insertions(+)
create mode 100644 drivers/gpu/drm/vgem/Makefile
create mode 100644 drivers/gpu/drm/vgem/vgem_dma_buf.c
create mode 100644 drivers/gpu/drm/vgem/vgem_drv.c
create mode 100644 drivers/gpu/drm/vgem/vgem_drv.h
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index e3b4b0f..39909bc 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -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/vmwgfx/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index c3cf64c..c1e4a0e 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -47,6 +47,7 @@ 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_GMA500) += gma500/
diff --git a/drivers/gpu/drm/vgem/Makefile b/drivers/gpu/drm/vgem/Makefile
new file mode 100644
index 0000000..1055cb7
--- /dev/null
+++ b/drivers/gpu/drm/vgem/Makefile
@@ -0,0 +1,4 @@
+ccflags-y := -Iinclude/drm
+vgem-y := vgem_drv.o vgem_dma_buf.o
+
+obj-$(CONFIG_DRM_VGEM) += vgem.o
diff --git a/drivers/gpu/drm/vgem/vgem_dma_buf.c
b/drivers/gpu/drm/vgem/vgem_dma_buf.c
new file mode 100644
index 0000000..8450124
--- /dev/null
+++ b/drivers/gpu/drm/vgem/vgem_dma_buf.c
@@ -0,0 +1,169 @@
+/*
+ * 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 at bwidawsk.net>
+ *
+ */
+
+#include <linux/dma-buf.h>
+#include "vgem_drv.h"
+
+#define VGEM_FD_PERMS 0600
+
+static struct sg_table *vgem_gem_map_dma_buf(struct dma_buf_attachment *attach,
+ enum dma_data_direction dir)
+{
+ struct drm_vgem_gem_object *obj = attach->dmabuf->priv;
+ struct sg_table *sg;
+ int ret;
+
+ ret = vgem_gem_get_pages(obj);
+ if (ret)
+ return ERR_PTR(ret);
+
+ /* VGEM assumes cache coherent access. Normally we might have to flush
+ * caches here */
+
+ BUG_ON(obj->pages == NULL);
+
+ sg = drm_prime_pages_to_sg(obj->pages, obj->base.size / PAGE_SIZE);
+ if (!sg) {
+ vgem_gem_put_pages(obj);
+ return NULL;
+ }
+
+ return sg;
+}
+
+static void vgem_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
+ struct sg_table *sg,
+ enum dma_data_direction data_direction)
+{
+ sg_free_table(sg);
+ kfree(sg);
+}
+
+static void *vgem_kmap_atomic_dma_buf(struct dma_buf *dma_buf,
+ unsigned long page_num)
+{
+ return NULL;
+}
+
+static void *vgem_kmap_dma_buf(struct dma_buf *dma_buf,
+ unsigned long page_num)
+{
+ return NULL;
+}
+
+static int vgem_mmap_dma_buf(struct dma_buf *dma_buf,
+ struct vm_area_struct *vma)
+{
+ return -EINVAL;
+}
+
+static struct dma_buf_ops vgem_dmabuf_ops = {
+ .map_dma_buf = vgem_gem_map_dma_buf,
+ .unmap_dma_buf = vgem_gem_unmap_dma_buf,
+ .release = drm_gem_dmabuf_release,
+ .kmap_atomic = vgem_kmap_atomic_dma_buf,
+ .kmap = vgem_kmap_dma_buf,
+ .mmap = vgem_mmap_dma_buf,
+};
+
+struct dma_buf *vgem_gem_prime_export(struct drm_device *dev,
+ struct drm_gem_object *obj,
+ int flags)
+{
+ return dma_buf_export(obj, &vgem_dmabuf_ops, obj->size, flags, NULL);
+}
+
+struct drm_gem_object *vgem_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf)
+{
+ struct drm_vgem_gem_object *obj = NULL;
+ struct dma_buf_attachment *attach = NULL;
+ struct sg_table *sg = NULL;
+ int num_pages;
+ int ret;
+
+ attach = dma_buf_attach(dma_buf, dev->dev);
+ if (IS_ERR(attach)) {
+ ret = PTR_ERR(attach);
+ goto fail;
+ }
+
+ get_dma_buf(dma_buf);
+
+ sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+ if (IS_ERR(sg)) {
+ ret = PTR_ERR(sg);
+ goto fail_detach;
+ }
+
+ obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+ if (obj == NULL) {
+ ret = -ENOMEM;
+ goto fail_unmap;
+ }
+
+ obj->base.import_attach = attach;
+ obj->sg = sg;
+
+ /* As a result of this mmap will not work -yet- */
+ ret = drm_gem_object_init(dev, &obj->base, dma_buf->size);
+ if (ret) {
+ ret = -ENOMEM;
+ goto fail_free;
+ }
+
+ num_pages = obj->base.size / PAGE_SIZE;
+
+ obj->pages = drm_malloc_ab(num_pages, sizeof(struct page *));
+ if (!obj->pages) {
+ ret = -ENOMEM;
+ goto fail_gem_release;
+ }
+
+ ret = drm_prime_sg_to_page_addr_arrays(sg, obj->pages, NULL, num_pages);
+ if (ret) {
+ ret = -ENOMEM;
+ goto fail_free_pages;
+ }
+
+ return &obj->base;
+
+fail_free_pages:
+ drm_free_large(obj->pages);
+fail_gem_release:
+ drm_gem_object_release(&obj->base);
+fail_free:
+ kfree(obj);
+fail_unmap:
+ dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
+fail_detach:
+ dma_buf_detach(dma_buf, attach);
+ dma_buf_put(dma_buf);
+fail:
+ return ERR_PTR(ret);
+}
diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
new file mode 100644
index 0000000..b0032c9
--- /dev/null
+++ b/drivers/gpu/drm/vgem/vgem_drv.c
@@ -0,0 +1,407 @@
+/*
+ * 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 at redhat.com>
+ * Ben Widawsky <ben at 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 "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 int vgem_load(struct drm_device *dev, unsigned long flags)
+{
+ platform_set_drvdata(dev->platformdev, dev);
+ return 0;
+}
+
+static int vgem_unload(struct drm_device *dev)
+{
+ return 0;
+}
+
+static int vgem_open(struct drm_device *dev, struct drm_file *file)
+{
+ return 0;
+}
+
+static void vgem_preclose(struct drm_device *dev, struct drm_file *file)
+{
+}
+
+static void vgem_lastclose(struct drm_device *dev)
+{
+}
+
+void vgem_gem_put_pages(struct drm_vgem_gem_object *obj)
+{
+ int num_pages = obj->base.size / PAGE_SIZE;
+ int i;
+
+ for (i = 0; i < num_pages; i++) {
+ if (obj->pages[i] == NULL)
+ break;
+ page_cache_release(obj->pages[i]);
+ }
+
+ drm_free_large(obj->pages);
+ 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 (obj->import_attach) {
+ drm_prime_gem_destroy(obj, vgem_obj->sg);
+ vgem_obj->pages = 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 address_space *mapping;
+ gfp_t gfpmask = GFP_KERNEL;
+ int num_pages, i, ret = 0;
+
+ num_pages = obj->base.size / PAGE_SIZE;
+
+ if (!obj->pages) {
+ obj->pages = drm_malloc_ab(num_pages, sizeof(struct page *));
+ if (obj->pages == NULL)
+ return -ENOMEM;
+ } else {
+ return 0;
+ }
+
+ mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
+ gfpmask |= mapping_gfp_mask(mapping);
+
+ for (i = 0; i < num_pages; i++) {
+ struct page *page;
+ obj->pages[i] = NULL;
+ page = shmem_read_mapping_page_gfp(mapping, i, gfpmask);
+ if (IS_ERR(page)) {
+ ret = PTR_ERR(page);
+ goto err_out;
+ }
+ obj->pages[i] = page;
+ }
+
+ return ret;
+
+err_out:
+ vgem_gem_put_pages(obj);
+ return ret;
+}
+
+static int vgem_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct drm_vgem_gem_object *obj = to_vgem_bo(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;
+
+ size = args->height * args->width * DIV_ROUND_UP(args->bpp, 8);
+ 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 = args->width;
+
+ 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)
+{
+ int ret;
+
+ ret = drm_gem_mmap(filp, vma);
+ if (ret)
+ return ret;
+
+ vma->vm_flags &= ~VM_PFNMAP;
+ vma->vm_flags |= VM_MIXEDMAP;
+
+ 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,
+ .load = vgem_load,
+ .unload = vgem_unload,
+ .open = vgem_open,
+ .preclose = vgem_preclose,
+ .lastclose = vgem_lastclose,
+ .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 = vgem_gem_prime_export,
+ .gem_prime_import = vgem_gem_prime_import,
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .date = DRIVER_DATE,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+};
+
+static int vgem_platform_probe(struct platform_device *pdev)
+{
+ vgem_driver.num_ioctls = ARRAY_SIZE(vgem_ioctls);
+
+ return drm_platform_init(&vgem_driver, pdev);
+}
+
+static int vgem_platform_remove(struct platform_device *pdev)
+{
+ drm_put_dev(platform_get_drvdata(pdev));
+ return 0;
+}
+
+static struct platform_driver vgem_platform_driver = {
+ .probe = vgem_platform_probe,
+ .remove = vgem_platform_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRIVER_NAME,
+ },
+};
+
+static struct platform_device *vgem_device;
+
+static int __init vgem_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&vgem_platform_driver);
+ if (ret)
+ goto out;
+
+ vgem_device = platform_device_alloc("vgem", -1);
+ if (!vgem_device) {
+ ret = -ENOMEM;
+ goto unregister_out;
+ }
+
+ vgem_device->dev.coherent_dma_mask = ~0ULL;
+ vgem_device->dev.dma_mask = &vgem_device->dev.coherent_dma_mask;
+
+ ret = platform_device_add(vgem_device);
+ if (ret)
+ goto put_out;
+
+ return 0;
+
+put_out:
+ platform_device_put(vgem_device);
+unregister_out:
+ platform_driver_unregister(&vgem_platform_driver);
+out:
+ return ret;
+}
+
+static void __exit vgem_exit(void)
+{
+ platform_device_unregister(vgem_device);
+ platform_driver_unregister(&vgem_platform_driver);
+}
+
+module_init(vgem_init);
+module_exit(vgem_exit);
+
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL and additional rights");
diff --git a/drivers/gpu/drm/vgem/vgem_drv.h b/drivers/gpu/drm/vgem/vgem_drv.h
new file mode 100644
index 0000000..6d889a2
--- /dev/null
+++ b/drivers/gpu/drm/vgem/vgem_drv.h
@@ -0,0 +1,62 @@
+/*
+ * 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 at 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;
+ struct sg_table *sg;
+};
+
+/* 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 int vgem_prime_to_fd(struct drm_device *dev,
+ struct drm_file *file_priv,
+ uint32_t handle, int *prime_fd);
+
+extern int vgem_prime_to_handle(struct drm_device *dev,
+ struct drm_file *file_priv,
+ int prime_fd, uint32_t *handle);
+
+extern struct dma_buf *vgem_gem_prime_export(struct drm_device *dev,
+ struct drm_gem_object *obj,
+ int flags);
+
+extern struct drm_gem_object *vgem_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf);
+
+#endif
--
2.1.0.rc2.206.gedb03e5
