drm_scatter.c revision 207066 
1/*-
2 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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 * Authors:
25 *   Gareth Hughes <gareth@valinux.com>
26 *   Eric Anholt <anholt@FreeBSD.org>
27 *
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/sys/dev/drm/drm_scatter.c 207066 2010-04-22 18:21:25Z rnoland $");
32
33/** @file drm_scatter.c
34 * Allocation of memory for scatter-gather mappings by the graphics chip.
35 *
36 * The memory allocated here is then made into an aperture in the card
37 * by drm_ati_pcigart_init().
38 */
39
40#include "dev/drm/drmP.h"
41
42static void drm_sg_alloc_cb(void *arg, bus_dma_segment_t *segs,
43			    int nsegs, int error);
44
45int
46drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request)
47{
48	struct drm_sg_mem *entry;
49	struct drm_dma_handle *dmah;
50	int ret;
51
52	if (dev->sg)
53		return EINVAL;
54
55	entry = malloc(sizeof(*entry), DRM_MEM_SGLISTS, M_WAITOK | M_ZERO);
56	entry->pages = round_page(request->size) / PAGE_SIZE;
57	DRM_DEBUG("sg size=%ld pages=%d\n", request->size, entry->pages);
58
59	entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
60	    DRM_MEM_PAGES, M_WAITOK | M_ZERO);
61	dmah = malloc(sizeof(struct drm_dma_handle), DRM_MEM_DMA,
62	    M_WAITOK | M_ZERO);
63	entry->dmah = dmah;
64
65	ret = bus_dma_tag_create(NULL, PAGE_SIZE, 0, /* tag, align, boundary */
66	    BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
67	    NULL, NULL, /* filtfunc, filtfuncargs */
68	    request->size, entry->pages, /* maxsize, nsegs */
69	    PAGE_SIZE, 0, /* maxsegsize, flags */
70	    NULL, NULL, /* lockfunc, lockfuncargs */
71	    &dmah->tag);
72	if (ret != 0) {
73		drm_sg_cleanup(entry);
74		return ENOMEM;
75	}
76
77	ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
78	    BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map);
79	if (ret != 0) {
80		drm_sg_cleanup(entry);
81		return ENOMEM;
82	}
83
84	entry->handle = (unsigned long)dmah->vaddr;
85	entry->virtual = dmah->vaddr;
86
87	ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr,
88	    request->size, drm_sg_alloc_cb, entry, BUS_DMA_NOWAIT);
89	if (ret != 0) {
90		drm_sg_cleanup(entry);
91		return ENOMEM;
92	}
93
94	DRM_LOCK();
95	if (dev->sg) {
96		DRM_UNLOCK();
97		drm_sg_cleanup(entry);
98		return EINVAL;
99	}
100	dev->sg = entry;
101	DRM_UNLOCK();
102
103	pmap_change_attr((vm_offset_t)dmah->vaddr, request->size,
104	    PAT_WRITE_COMBINING);
105
106	request->handle = entry->handle;
107
108	DRM_DEBUG("handle=%08lx, kva=%p, contents=%08lx\n", entry->handle,
109	    entry->virtual, *(unsigned long *)entry->virtual);
110
111	return 0;
112}
113
114static void
115drm_sg_alloc_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
116{
117	struct drm_sg_mem *entry = arg;
118	int i;
119
120	if (error != 0)
121	    return;
122
123	for(i = 0 ; i < nsegs ; i++) {
124		entry->busaddr[i] = segs[i].ds_addr;
125		DRM_DEBUG("segment %d @ 0x%016lx\n", i,
126		    (unsigned long)segs[i].ds_addr);
127	}
128}
129
130int
131drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
132		   struct drm_file *file_priv)
133{
134	struct drm_scatter_gather *request = data;
135
136	DRM_DEBUG("\n");
137
138	return drm_sg_alloc(dev, request);
139}
140
141void
142drm_sg_cleanup(struct drm_sg_mem *entry)
143{
144	struct drm_dma_handle *dmah = entry->dmah;
145
146	if (dmah->map != NULL)
147		bus_dmamap_unload(dmah->tag, dmah->map);
148	if (dmah->vaddr != NULL)
149		bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
150	if (dmah->tag != NULL)
151		bus_dma_tag_destroy(dmah->tag);
152	free(dmah, DRM_MEM_DMA);
153	free(entry->busaddr, DRM_MEM_PAGES);
154	free(entry, DRM_MEM_SGLISTS);
155}
156
157int
158drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
159{
160	struct drm_scatter_gather *request = data;
161	struct drm_sg_mem *entry;
162
163	DRM_LOCK();
164	entry = dev->sg;
165	dev->sg = NULL;
166	DRM_UNLOCK();
167
168	if (!entry || entry->handle != request->handle)
169		return EINVAL;
170
171	DRM_DEBUG("sg free virtual = 0x%lx\n", entry->handle);
172
173	drm_sg_cleanup(entry);
174
175	return 0;
176}
177