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.
12 * All Rights Reserved.
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
34 #include <linux/vmalloc.h>
35 #include <linux/slab.h>
38 #define DEBUG_SCATTER 0
40 static inline void *drm_vmalloc_dma(unsigned long size)
42 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
43 return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL | _PAGE_NO_CACHE);
45 return vmalloc_32(size);
49 void drm_sg_cleanup(struct drm_sg_mem * entry)
54 for (i = 0; i < entry->pages; i++) {
55 page = entry->pagelist[i];
57 ClearPageReserved(page);
60 vfree(entry->virtual);
62 kfree(entry->busaddr);
63 kfree(entry->pagelist);
68 # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
70 # define ScatterHandle(x) (unsigned int)(x)
73 int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
75 struct drm_sg_mem *entry;
76 unsigned long pages, i, j;
80 if (!drm_core_check_feature(dev, DRIVER_SG))
86 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
90 memset(entry, 0, sizeof(*entry));
91 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
92 DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages);
95 entry->pagelist = kmalloc(pages * sizeof(*entry->pagelist), GFP_KERNEL);
96 if (!entry->pagelist) {
101 memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist));
103 entry->busaddr = kmalloc(pages * sizeof(*entry->busaddr), GFP_KERNEL);
104 if (!entry->busaddr) {
105 kfree(entry->pagelist);
109 memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr));
111 entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT);
112 if (!entry->virtual) {
113 kfree(entry->busaddr);
114 kfree(entry->pagelist);
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("handle = %08lx\n", entry->handle);
127 DRM_DEBUG("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);
187 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("virtual = %p\n", entry->virtual);
216 drm_sg_cleanup(entry);