2 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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:
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
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.
25 * Gareth Hughes <gareth@valinux.com>
26 * Eric Anholt <anholt@FreeBSD.org>
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 /** @file drm_scatter.c
34 * Allocation of memory for scatter-gather mappings by the graphics chip.
36 * The memory allocated here is then made into an aperture in the card
37 * by drm_ati_pcigart_init().
40 #include "dev/drm/drmP.h"
42 static void drm_sg_alloc_cb(void *arg, bus_dma_segment_t *segs,
43 int nsegs, int error);
46 drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request)
48 struct drm_sg_mem *entry;
49 struct drm_dma_handle *dmah;
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);
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,
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 */
73 drm_sg_cleanup(entry);
77 ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
78 BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map);
80 drm_sg_cleanup(entry);
84 entry->handle = (unsigned long)dmah->vaddr;
85 entry->virtual = dmah->vaddr;
87 ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr,
88 request->size, drm_sg_alloc_cb, entry, BUS_DMA_NOWAIT);
90 drm_sg_cleanup(entry);
97 drm_sg_cleanup(entry);
103 DRM_DEBUG("handle=%08lx, kva=%p, contents=%08lx\n", entry->handle,
104 entry->virtual, *(unsigned long *)entry->virtual);
106 request->handle = entry->handle;
112 drm_sg_alloc_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
114 struct drm_sg_mem *entry = arg;
120 for(i = 0 ; i < nsegs ; i++) {
121 entry->busaddr[i] = segs[i].ds_addr;
122 DRM_DEBUG("segment %d @ 0x%016lx\n", i,
123 (unsigned long)segs[i].ds_addr);
128 drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
129 struct drm_file *file_priv)
131 struct drm_scatter_gather *request = data;
135 return drm_sg_alloc(dev, request);
139 drm_sg_cleanup(struct drm_sg_mem *entry)
141 struct drm_dma_handle *dmah = entry->dmah;
143 if (dmah->map != NULL)
144 bus_dmamap_unload(dmah->tag, dmah->map);
145 if (dmah->vaddr != NULL)
146 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
147 if (dmah->tag != NULL)
148 bus_dma_tag_destroy(dmah->tag);
149 free(dmah, DRM_MEM_DMA);
150 free(entry->busaddr, DRM_MEM_PAGES);
151 free(entry, DRM_MEM_SGLISTS);
155 drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
157 struct drm_scatter_gather *request = data;
158 struct drm_sg_mem *entry;
165 if (!entry || entry->handle != request->handle)
168 DRM_DEBUG("sg free virtual = 0x%lx\n", entry->handle);
170 drm_sg_cleanup(entry);