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1/*2 * Copyright 2011 Red Hat, Inc.3 * Copyright © 2014 The Chromium OS Authors4 *5 * Permission is hereby granted, free of charge, to any person obtaining a6 * copy of this software and associated documentation files (the "Software")7 * to deal in the software without restriction, including without limitation8 * on the rights to use, copy, modify, merge, publish, distribute, sub9 * license, and/or sell copies of the Software, and to permit persons to whom10 * them Software is furnished to do so, subject to the following conditions:11 *12 * The above copyright notice and this permission notice (including the next13 * paragraph) shall be included in all copies or substantial portions of the14 * Software.15 *16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL19 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER20 * IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.22 *23 * Authors:24 * Adam Jackson <ajax@redhat.com>25 * Ben Widawsky <ben@bwidawsk.net>26 */27 28/*29 * This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's30 * software renderer and the X server for efficient buffer sharing.31 */32 33#include <linux/dma-buf.h>34#include <linux/module.h>35#include <linux/platform_device.h>36#include <linux/shmem_fs.h>37#include <linux/vmalloc.h>38 39#include <drm/drm_drv.h>40#include <drm/drm_file.h>41#include <drm/drm_gem_shmem_helper.h>42#include <drm/drm_ioctl.h>43#include <drm/drm_managed.h>44#include <drm/drm_prime.h>45 46#include "vgem_drv.h"47 48#define DRIVER_NAME "vgem"49#define DRIVER_DESC "Virtual GEM provider"50#define DRIVER_DATE "20120112"51#define DRIVER_MAJOR 152#define DRIVER_MINOR 053 54static struct vgem_device {55 struct drm_device drm;56 struct platform_device *platform;57} *vgem_device;58 59static int vgem_open(struct drm_device *dev, struct drm_file *file)60{61 struct vgem_file *vfile;62 int ret;63 64 vfile = kzalloc(sizeof(*vfile), GFP_KERNEL);65 if (!vfile)66 return -ENOMEM;67 68 file->driver_priv = vfile;69 70 ret = vgem_fence_open(vfile);71 if (ret) {72 kfree(vfile);73 return ret;74 }75 76 return 0;77}78 79static void vgem_postclose(struct drm_device *dev, struct drm_file *file)80{81 struct vgem_file *vfile = file->driver_priv;82 83 vgem_fence_close(vfile);84 kfree(vfile);85}86 87static struct drm_ioctl_desc vgem_ioctls[] = {88 DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_RENDER_ALLOW),89 DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW),90};91 92DEFINE_DRM_GEM_FOPS(vgem_driver_fops);93 94static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, size_t size)95{96 struct drm_gem_shmem_object *obj;97 98 obj = kzalloc(sizeof(*obj), GFP_KERNEL);99 if (!obj)100 return ERR_PTR(-ENOMEM);101 102 /*103 * vgem doesn't have any begin/end cpu access ioctls, therefore must use104 * coherent memory or dma-buf sharing just wont work.105 */106 obj->map_wc = true;107 108 return &obj->base;109}110 111static const struct drm_driver vgem_driver = {112 .driver_features = DRIVER_GEM | DRIVER_RENDER,113 .open = vgem_open,114 .postclose = vgem_postclose,115 .ioctls = vgem_ioctls,116 .num_ioctls = ARRAY_SIZE(vgem_ioctls),117 .fops = &vgem_driver_fops,118 119 DRM_GEM_SHMEM_DRIVER_OPS,120 .gem_create_object = vgem_gem_create_object,121 122 .name = DRIVER_NAME,123 .desc = DRIVER_DESC,124 .date = DRIVER_DATE,125 .major = DRIVER_MAJOR,126 .minor = DRIVER_MINOR,127};128 129static int __init vgem_init(void)130{131 int ret;132 struct platform_device *pdev;133 134 pdev = platform_device_register_simple("vgem", -1, NULL, 0);135 if (IS_ERR(pdev))136 return PTR_ERR(pdev);137 138 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {139 ret = -ENOMEM;140 goto out_unregister;141 }142 143 dma_coerce_mask_and_coherent(&pdev->dev,144 DMA_BIT_MASK(64));145 146 vgem_device = devm_drm_dev_alloc(&pdev->dev, &vgem_driver,147 struct vgem_device, drm);148 if (IS_ERR(vgem_device)) {149 ret = PTR_ERR(vgem_device);150 goto out_devres;151 }152 vgem_device->platform = pdev;153 154 /* Final step: expose the device/driver to userspace */155 ret = drm_dev_register(&vgem_device->drm, 0);156 if (ret)157 goto out_devres;158 159 return 0;160 161out_devres:162 devres_release_group(&pdev->dev, NULL);163out_unregister:164 platform_device_unregister(pdev);165 return ret;166}167 168static void __exit vgem_exit(void)169{170 struct platform_device *pdev = vgem_device->platform;171 172 drm_dev_unregister(&vgem_device->drm);173 devres_release_group(&pdev->dev, NULL);174 platform_device_unregister(pdev);175}176 177module_init(vgem_init);178module_exit(vgem_exit);179 180MODULE_AUTHOR("Red Hat, Inc.");181MODULE_AUTHOR("Intel Corporation");182MODULE_DESCRIPTION(DRIVER_DESC);183MODULE_LICENSE("GPL and additional rights");184