1/*-
2 * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org>
3 * All Rights Reserved.
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * 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 MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 */
24
25#include <sys/cdefs.h>
26__FBSDID("$FreeBSD$");
27
28/** @file drm_scatter.c
29 * Allocation of memory for scatter-gather mappings by the graphics chip.
30 * The memory allocated here is then made into an aperture in the card
31 * by mapping the pages into the GART.
32 */
33
34#include <dev/drm2/drmP.h>
35
36#define DEBUG_SCATTER 0
37
38static inline vm_offset_t drm_vmalloc_dma(vm_size_t size)
39{
40	return kmem_alloc_attr(kernel_arena, size, M_NOWAIT | M_ZERO,
41	    0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING);
42}
43
44void drm_sg_cleanup(struct drm_sg_mem * entry)
45{
46	if (entry == NULL)
47		return;
48
49	if (entry->vaddr != 0)
50		kmem_free(kernel_arena, entry->vaddr, IDX_TO_OFF(entry->pages));
51
52	free(entry->busaddr, DRM_MEM_SGLISTS);
53	free(entry, DRM_MEM_DRIVER);
54}
55
56int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
57{
58	struct drm_sg_mem *entry;
59	vm_size_t size;
60	vm_pindex_t pindex;
61
62	DRM_DEBUG("\n");
63
64	if (!drm_core_check_feature(dev, DRIVER_SG))
65		return -EINVAL;
66
67	if (dev->sg)
68		return -EINVAL;
69
70	entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
71	if (!entry)
72		return -ENOMEM;
73
74	DRM_DEBUG("request size=%ld\n", request->size);
75
76	size = round_page(request->size);
77	entry->pages = OFF_TO_IDX(size);
78	entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
79	    DRM_MEM_SGLISTS, M_NOWAIT | M_ZERO);
80	if (!entry->busaddr) {
81		free(entry, DRM_MEM_DRIVER);
82		return -ENOMEM;
83	}
84
85	entry->vaddr = drm_vmalloc_dma(size);
86	if (entry->vaddr == 0) {
87		free(entry->busaddr, DRM_MEM_DRIVER);
88		free(entry, DRM_MEM_DRIVER);
89		return -ENOMEM;
90	}
91
92	for (pindex = 0; pindex < entry->pages; pindex++) {
93		entry->busaddr[pindex] =
94		    vtophys(entry->vaddr + IDX_TO_OFF(pindex));
95	}
96
97	request->handle = entry->vaddr;
98
99	dev->sg = entry;
100
101	DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n",
102	    entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr);
103
104	return 0;
105}
106
107int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
108		       struct drm_file *file_priv)
109{
110	struct drm_scatter_gather *request = data;
111
112	return drm_sg_alloc(dev, request);
113
114}
115
116int drm_sg_free(struct drm_device *dev, void *data,
117		struct drm_file *file_priv)
118{
119	struct drm_scatter_gather *request = data;
120	struct drm_sg_mem *entry;
121
122	if (!drm_core_check_feature(dev, DRIVER_SG))
123		return -EINVAL;
124
125	entry = dev->sg;
126	dev->sg = NULL;
127
128	if (!entry || entry->vaddr != request->handle)
129		return -EINVAL;
130
131	DRM_DEBUG("free 0x%zx\n", entry->vaddr);
132
133	drm_sg_cleanup(entry);
134
135	return 0;
136}
137