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
36int
37drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request)
38{
39	struct drm_sg_mem *entry;
40	vm_size_t size;
41	vm_pindex_t pindex;
42
43	if (dev->sg)
44		return EINVAL;
45
46	DRM_DEBUG("request size=%ld\n", request->size);
47
48	entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_WAITOK | M_ZERO);
49
50	size = round_page(request->size);
51	entry->pages = OFF_TO_IDX(size);
52	entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
53	    DRM_MEM_SGLISTS, M_WAITOK | M_ZERO);
54
55	entry->vaddr = kmem_alloc_attr(kernel_arena, size, M_WAITOK | M_ZERO,
56	    0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING);
57	if (entry->vaddr == 0) {
58		drm_sg_cleanup(entry);
59		return (ENOMEM);
60	}
61
62	for(pindex = 0; pindex < entry->pages; pindex++) {
63		entry->busaddr[pindex] =
64		    vtophys(entry->vaddr + IDX_TO_OFF(pindex));
65	}
66
67	DRM_LOCK(dev);
68	if (dev->sg) {
69		DRM_UNLOCK(dev);
70		drm_sg_cleanup(entry);
71		return (EINVAL);
72	}
73	dev->sg = entry;
74	DRM_UNLOCK(dev);
75
76	request->handle = entry->vaddr;
77
78	DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n",
79	    entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr);
80
81	return (0);
82}
83
84int
85drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
86		   struct drm_file *file_priv)
87{
88	struct drm_scatter_gather *request = data;
89
90	DRM_DEBUG("\n");
91
92	return (drm_sg_alloc(dev, request));
93}
94
95void
96drm_sg_cleanup(struct drm_sg_mem *entry)
97{
98	if (entry == NULL)
99		return;
100
101	if (entry->vaddr != 0)
102		kmem_free(kernel_arena, entry->vaddr, IDX_TO_OFF(entry->pages));
103
104	free(entry->busaddr, DRM_MEM_SGLISTS);
105	free(entry, DRM_MEM_DRIVER);
106
107	return;
108}
109
110int
111drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
112{
113	struct drm_scatter_gather *request = data;
114	struct drm_sg_mem *entry;
115
116	DRM_LOCK(dev);
117	entry = dev->sg;
118	dev->sg = NULL;
119	DRM_UNLOCK(dev);
120
121	if (!entry || entry->vaddr != request->handle)
122		return (EINVAL);
123
124	DRM_DEBUG("free 0x%zx\n", entry->vaddr);
125
126	drm_sg_cleanup(entry);
127
128	return (0);
129}
130