3 * IOCTLs to manage scatter/gather memory
5 * \author Gareth Hughes <gareth@valinux.com>
9 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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34 #include <linux/vmalloc.h>
37 #define DEBUG_SCATTER 0
39 void drm_sg_cleanup(struct drm_sg_mem *entry)
44 for (i = 0; i < entry->pages; i++) {
45 page = entry->pagelist[i];
47 ClearPageReserved(page);
50 vfree(entry->virtual);
52 drm_free(entry->busaddr,
53 entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES);
54 drm_free(entry->pagelist,
55 entry->pages * sizeof(*entry->pagelist), DRM_MEM_PAGES);
56 drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
58 EXPORT_SYMBOL(drm_sg_cleanup);
61 # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
63 # define ScatterHandle(x) (unsigned int)(x)
66 int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
68 struct drm_sg_mem *entry;
69 unsigned long pages, i, j;
71 DRM_DEBUG("%s\n", __FUNCTION__);
73 if (!drm_core_check_feature(dev, DRIVER_SG))
79 entry = drm_alloc(sizeof(*entry), DRM_MEM_SGLISTS);
83 memset(entry, 0, sizeof(*entry));
84 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
85 DRM_DEBUG("sg size=%ld pages=%ld\n", request->size, pages);
88 entry->pagelist = drm_alloc(pages * sizeof(*entry->pagelist),
90 if (!entry->pagelist) {
91 drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
95 memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist));
97 entry->busaddr = drm_alloc(pages * sizeof(*entry->busaddr),
99 if (!entry->busaddr) {
100 drm_free(entry->pagelist,
101 entry->pages * sizeof(*entry->pagelist),
103 drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
106 memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr));
108 entry->virtual = vmalloc_32(pages << PAGE_SHIFT);
109 if (!entry->virtual) {
110 drm_free(entry->busaddr,
111 entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES);
112 drm_free(entry->pagelist,
113 entry->pages * sizeof(*entry->pagelist),
115 drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
119 /* This also forces the mapping of COW pages, so our page list
120 * will be valid. Please don't remove it...
122 memset(entry->virtual, 0, pages << PAGE_SHIFT);
124 entry->handle = ScatterHandle((unsigned long)entry->virtual);
126 DRM_DEBUG("sg alloc handle = %08lx\n", entry->handle);
127 DRM_DEBUG("sg alloc virtual = %p\n", entry->virtual);
129 for (i = (unsigned long)entry->virtual, j = 0; j < pages;
130 i += PAGE_SIZE, j++) {
131 entry->pagelist[j] = vmalloc_to_page((void *)i);
132 if (!entry->pagelist[j])
134 SetPageReserved(entry->pagelist[j]);
137 request->handle = entry->handle;
142 /* Verify that each page points to its virtual address, and vice
148 for (i = 0; i < pages; i++) {
151 tmp = page_address(entry->pagelist[i]);
153 j < PAGE_SIZE / sizeof(unsigned long);
157 tmp = (unsigned long *)((u8 *) entry->virtual +
160 j < PAGE_SIZE / sizeof(unsigned long);
162 if (*tmp != 0xcafebabe && error == 0) {
164 DRM_ERROR("Scatter allocation error, "
165 "pagelist does not match "
166 "virtual mapping\n");
169 tmp = page_address(entry->pagelist[i]);
171 j < PAGE_SIZE / sizeof(unsigned long);
177 DRM_ERROR("Scatter allocation matches pagelist\n");
184 drm_sg_cleanup(entry);
188 EXPORT_SYMBOL(drm_sg_alloc);
190 int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
191 struct drm_file *file_priv)
193 struct drm_scatter_gather *request = data;
195 return drm_sg_alloc(dev, request);
199 int drm_sg_free(struct drm_device *dev, void *data,
200 struct drm_file *file_priv)
202 struct drm_scatter_gather *request = data;
203 struct drm_sg_mem *entry;
205 if (!drm_core_check_feature(dev, DRIVER_SG))
211 if (!entry || entry->handle != request->handle)
214 DRM_DEBUG("sg free virtual = %p\n", entry->virtual);
216 drm_sg_cleanup(entry);