diff options
Diffstat (limited to 'drivers/gpu/drm/vgem/vgem_drv.c')
| -rw-r--r-- | drivers/gpu/drm/vgem/vgem_drv.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c new file mode 100644 index 000000000..c5e3e5457 --- /dev/null +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -0,0 +1,183 @@ +/* + * 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/dma-buf.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/shmem_fs.h> +#include <linux/vmalloc.h> + +#include <drm/drm_drv.h> +#include <drm/drm_file.h> +#include <drm/drm_gem_shmem_helper.h> +#include <drm/drm_ioctl.h> +#include <drm/drm_managed.h> +#include <drm/drm_prime.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 struct vgem_device { + struct drm_device drm; + struct platform_device *platform; +} *vgem_device; + +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_postclose(struct drm_device *dev, struct drm_file *file) +{ + struct vgem_file *vfile = file->driver_priv; + + vgem_fence_close(vfile); + kfree(vfile); +} + +static struct drm_ioctl_desc vgem_ioctls[] = { + DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_RENDER_ALLOW), + DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW), +}; + +DEFINE_DRM_GEM_FOPS(vgem_driver_fops); + +static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, size_t size) +{ + struct drm_gem_shmem_object *obj; + + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (!obj) + return ERR_PTR(-ENOMEM); + + /* + * vgem doesn't have any begin/end cpu access ioctls, therefore must use + * coherent memory or dma-buf sharing just wont work. + */ + obj->map_wc = true; + + return &obj->base; +} + +static const struct drm_driver vgem_driver = { + .driver_features = DRIVER_GEM | DRIVER_RENDER, + .open = vgem_open, + .postclose = vgem_postclose, + .ioctls = vgem_ioctls, + .num_ioctls = ARRAY_SIZE(vgem_ioctls), + .fops = &vgem_driver_fops, + + DRM_GEM_SHMEM_DRIVER_OPS, + .gem_create_object = vgem_gem_create_object, + + .name = DRIVER_NAME, + .desc = DRIVER_DESC, + .date = DRIVER_DATE, + .major = DRIVER_MAJOR, + .minor = DRIVER_MINOR, +}; + +static int __init vgem_init(void) +{ + int ret; + struct platform_device *pdev; + + pdev = platform_device_register_simple("vgem", -1, NULL, 0); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) { + ret = -ENOMEM; + goto out_unregister; + } + + dma_coerce_mask_and_coherent(&pdev->dev, + DMA_BIT_MASK(64)); + + vgem_device = devm_drm_dev_alloc(&pdev->dev, &vgem_driver, + struct vgem_device, drm); + if (IS_ERR(vgem_device)) { + ret = PTR_ERR(vgem_device); + goto out_devres; + } + vgem_device->platform = pdev; + + /* Final step: expose the device/driver to userspace */ + ret = drm_dev_register(&vgem_device->drm, 0); + if (ret) + goto out_devres; + + return 0; + +out_devres: + devres_release_group(&pdev->dev, NULL); +out_unregister: + platform_device_unregister(pdev); + return ret; +} + +static void __exit vgem_exit(void) +{ + struct platform_device *pdev = vgem_device->platform; + + drm_dev_unregister(&vgem_device->drm); + devres_release_group(&pdev->dev, NULL); + platform_device_unregister(pdev); +} + +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"); |