[mirror_ubuntu-jammy-kernel.git] / drivers / gpu / drm / vgem / vgem_drv.c

/*
 * 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,
};

/* 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[] = {
};

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 struct drm_driver vgem_driver = {
	.driver_features		= DRIVER_GEM,
	.gem_free_object_unlocked	= 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,
	.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_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL and additional rights");
Commit	Line	Data
502e95c6 ZR	1	/*
	2	* Copyright 2011 Red Hat, Inc.
	3	* Copyright © 2014 The Chromium OS Authors
	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a
	6	* copy of this software and associated documentation files (the "Software")
	7	* to deal in the software without restriction, including without limitation
	8	* on the rights to use, copy, modify, merge, publish, distribute, sub
	9	* license, and/or sell copies of the Software, and to permit persons to whom
	10	* them Software is furnished to do so, subject to the following conditions:
	11	*
	12	* The above copyright notice and this permission notice (including the next
	13	* paragraph) shall be included in all copies or substantial portions of the
	14	* Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER
	20	* IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN
	21	* 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's
	30	* software renderer and the X server for efficient buffer sharing.
	31	*/
	32
	33	#include <linux/module.h>
	34	#include <linux/ramfs.h>
	35	#include <linux/shmem_fs.h>
	36	#include <linux/dma-buf.h>
	37	#include "vgem_drv.h"
	38
	39	#define DRIVER_NAME "vgem"
	40	#define DRIVER_DESC "Virtual GEM provider"
	41	#define DRIVER_DATE "20120112"
	42	#define DRIVER_MAJOR 1
	43	#define DRIVER_MINOR 0
	44
502e95c6 ZR	45	static void vgem_gem_free_object(struct drm_gem_object *obj)
	46	{
	47	struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
	48
502e95c6	49	drm_gem_object_release(obj);
502e95c6 ZR	50	kfree(vgem_obj);
	51	}
	52
502e95c6 ZR	53	static int vgem_gem_fault(struct vm_area_struct vma, struct vm_fault vmf)
	54	{
	55	struct drm_vgem_gem_object *obj = vma->vm_private_data;
502e95c6	56	/* We don't use vmf->pgoff since that has the fake offset */
5ba6c9ff CW	57	unsigned long vaddr = (unsigned long)vmf->virtual_address;
	58	struct page *page;
	59
	60	page = shmem_read_mapping_page(file_inode(obj->base.filp)->i_mapping,
	61	(vaddr - vma->vm_start) >> PAGE_SHIFT);
	62	if (!IS_ERR(page)) {
	63	vmf->page = page;
	64	return 0;
	65	} else switch (PTR_ERR(page)) {
	66	case -ENOSPC:
	67	case -ENOMEM:
	68	return VM_FAULT_OOM;
	69	case -EBUSY:
	70	return VM_FAULT_RETRY;
	71	case -EFAULT:
	72	case -EINVAL:
	73	return VM_FAULT_SIGBUS;
	74	default:
	75	WARN_ON_ONCE(PTR_ERR(page));
	76	return VM_FAULT_SIGBUS;
502e95c6 ZR	77	}
	78	}
	79
7cbea8dc	80	static const struct vm_operations_struct vgem_gem_vm_ops = {
502e95c6 ZR	81	.fault = vgem_gem_fault,
	82	.open = drm_gem_vm_open,
	83	.close = drm_gem_vm_close,
	84	};
	85
	86	/* ioctls */
	87
	88	static struct drm_gem_object vgem_gem_create(struct drm_device dev,
	89	struct drm_file *file,
	90	unsigned int *handle,
	91	unsigned long size)
	92	{
	93	struct drm_vgem_gem_object *obj;
5ba6c9ff	94	int ret;
502e95c6 ZR	95
	96	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	97	if (!obj)
	98	return ERR_PTR(-ENOMEM);
	99
5ba6c9ff CW	100	ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE));
	101	if (ret)
	102	goto err_free;
502e95c6	103
5ba6c9ff CW	104	ret = drm_gem_handle_create(file, &obj->base, handle);
	105	drm_gem_object_unreference_unlocked(&obj->base);
	106	if (ret)
	107	goto err;
502e95c6	108
5ba6c9ff	109	return &obj->base;
502e95c6	110
5ba6c9ff	111	err_free:
502e95c6	112	kfree(obj);
5ba6c9ff CW	113	err:
5ba6c9ff CW	114	return ERR_PTR(ret);
502e95c6 ZR	115	}
	116
	117	static int vgem_gem_dumb_create(struct drm_file file, struct drm_device dev,
	118	struct drm_mode_create_dumb *args)
	119	{
	120	struct drm_gem_object *gem_object;
5ba6c9ff	121	u64 pitch, size;
502e95c6	122
5ba6c9ff	123	pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
502e95c6 ZR	124	size = args->height * pitch;
	125	if (size == 0)
	126	return -EINVAL;
	127
	128	gem_object = vgem_gem_create(dev, file, &args->handle, size);
5ba6c9ff	129	if (IS_ERR(gem_object))
502e95c6	130	return PTR_ERR(gem_object);
502e95c6 ZR	131
	132	args->size = gem_object->size;
	133	args->pitch = pitch;
	134
	135	DRM_DEBUG_DRIVER("Created object of size %lld\n", size);
	136
	137	return 0;
	138	}
	139
5ba6c9ff CW	140	static int vgem_gem_dumb_map(struct drm_file file, struct drm_device dev,
5ba6c9ff CW	141	uint32_t handle, uint64_t *offset)
502e95c6	142	{
502e95c6	143	struct drm_gem_object *obj;
5ba6c9ff	144	int ret;
502e95c6	145
a8ad0bd8	146	obj = drm_gem_object_lookup(file, handle);
0797ac61 DV	147	if (!obj)
0797ac61 DV	148	return -ENOENT;
502e95c6	149
5ba6c9ff CW	150	if (!obj->filp) {
	151	ret = -EINVAL;
	152	goto unref;
	153	}
	154
e34274fd DV	155	ret = drm_gem_create_mmap_offset(obj);
	156	if (ret)
	157	goto unref;
502e95c6	158
502e95c6	159	*offset = drm_vma_node_offset_addr(&obj->vma_node);
502e95c6	160	unref:
0797ac61 DV	161	drm_gem_object_unreference_unlocked(obj);
0797ac61 DV	162
502e95c6 ZR	163	return ret;
	164	}
	165
502e95c6 ZR	166	static struct drm_ioctl_desc vgem_ioctls[] = {
	167	};
	168
5ba6c9ff CW	169	static int vgem_mmap(struct file filp, struct vm_area_struct vma)
	170	{
	171	unsigned long flags = vma->vm_flags;
	172	int ret;
	173
	174	ret = drm_gem_mmap(filp, vma);
	175	if (ret)
	176	return ret;
	177
	178	/* Keep the WC mmaping set by drm_gem_mmap() but our pages
	179	* are ordinary and not special.
	180	*/
	181	vma->vm_flags = flags \| VM_DONTEXPAND \| VM_DONTDUMP;
	182	return 0;
	183	}
	184
502e95c6 ZR	185	static const struct file_operations vgem_driver_fops = {
	186	.owner = THIS_MODULE,
	187	.open = drm_open,
5ba6c9ff	188	.mmap = vgem_mmap,
502e95c6 ZR	189	.poll = drm_poll,
	190	.read = drm_read,
	191	.unlocked_ioctl = drm_ioctl,
	192	.release = drm_release,
	193	};
	194
	195	static struct drm_driver vgem_driver = {
990ed272	196	.driver_features = DRIVER_GEM,
1bd816f1	197	.gem_free_object_unlocked = vgem_gem_free_object,
502e95c6 ZR	198	.gem_vm_ops = &vgem_gem_vm_ops,
	199	.ioctls = vgem_ioctls,
	200	.fops = &vgem_driver_fops,
	201	.dumb_create = vgem_gem_dumb_create,
	202	.dumb_map_offset = vgem_gem_dumb_map,
502e95c6 ZR	203	.name = DRIVER_NAME,
	204	.desc = DRIVER_DESC,
	205	.date = DRIVER_DATE,
	206	.major = DRIVER_MAJOR,
	207	.minor = DRIVER_MINOR,
	208	};
	209
5ba6c9ff	210	static struct drm_device *vgem_device;
502e95c6 ZR	211
	212	static int __init vgem_init(void)
	213	{
	214	int ret;
	215
	216	vgem_device = drm_dev_alloc(&vgem_driver, NULL);
	217	if (!vgem_device) {
	218	ret = -ENOMEM;
	219	goto out;
	220	}
	221
	222	ret = drm_dev_register(vgem_device, 0);
502e95c6 ZR	223	if (ret)
	224	goto out_unref;
	225
	226	return 0;
	227
	228	out_unref:
	229	drm_dev_unref(vgem_device);
	230	out:
	231	return ret;
	232	}
	233
	234	static void __exit vgem_exit(void)
	235	{
	236	drm_dev_unregister(vgem_device);
	237	drm_dev_unref(vgem_device);
	238	}
	239
	240	module_init(vgem_init);
	241	module_exit(vgem_exit);
	242
	243	MODULE_AUTHOR("Red Hat, Inc.");
	244	MODULE_DESCRIPTION(DRIVER_DESC);
	245	MODULE_LICENSE("GPL and additional rights");