1 /* drm_memory.h -- Memory management wrappers for DRM -*- linux-c -*-
2 * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
28 * Rickard E. (Rik) Faith <faith@valinux.com>
29 * Gareth Hughes <gareth@valinux.com>
32 #include <linux/config.h>
34 #include <linux/vmalloc.h>
37 #include <asm/tlbflush.h>
39 /* Cut down version of drm_memory_debug.h, which used to be called
40 * drm_memory.h. If you want the debug functionality, change 0 to 1
43 #define DEBUG_MEMORY 0
48 * Find the drm_map that covers the range [offset, offset+size).
50 static inline drm_map_t *
51 drm_lookup_map (unsigned long offset, unsigned long size, drm_device_t *dev)
53 struct list_head *list;
54 drm_map_list_t *r_list;
57 list_for_each(list, &dev->maplist->head) {
58 r_list = (drm_map_list_t *) list;
62 if (map->offset <= offset && (offset + size) <= (map->offset + map->size))
69 agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev)
71 unsigned long *phys_addr_map, i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE;
72 struct drm_agp_mem *agpmem;
73 struct page **page_map;
76 size = PAGE_ALIGN(size);
78 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
79 if (agpmem->bound <= offset
80 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size))
86 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
87 * the CPU do not get remapped by the GART. We fix this by using the kernel's
88 * page-table instead (that's probably faster anyhow...).
90 /* note: use vmalloc() because num_pages could be large... */
91 page_map = vmalloc(num_pages * sizeof(struct page *));
95 phys_addr_map = agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
96 for (i = 0; i < num_pages; ++i)
97 page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
98 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
103 flush_tlb_kernel_range((unsigned long) addr, (unsigned long) addr + size);
107 static inline unsigned long
108 drm_follow_page (void *vaddr)
110 pgd_t *pgd = pgd_offset_k((unsigned long) vaddr);
111 pmd_t *pmd = pmd_offset(pgd, (unsigned long) vaddr);
112 pte_t *ptep = pte_offset_kernel(pmd, (unsigned long) vaddr);
113 return pte_pfn(*ptep) << PAGE_SHIFT;
116 #else /* !__REALLY_HAVE_AGP */
119 agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev)
124 #endif /* !__REALLY_HAVE_AGP */
126 static inline void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t *dev)
128 int remap_aperture = 0;
130 #if __REALLY_HAVE_AGP
131 if (dev->agp->cant_use_aperture) {
132 drm_map_t *map = drm_lookup_map(offset, size, dev);
134 if (map && map->type == _DRM_AGP)
139 return agp_remap(offset, size, dev);
141 return ioremap(offset, size);
144 static inline void *drm_ioremap_nocache(unsigned long offset, unsigned long size,
147 int remap_aperture = 0;
149 #if __REALLY_HAVE_AGP
150 if (dev->agp->cant_use_aperture) {
151 drm_map_t *map = drm_lookup_map(offset, size, dev);
153 if (map && map->type == _DRM_AGP)
158 return agp_remap(offset, size, dev);
160 return ioremap_nocache(offset, size);
163 static inline void drm_ioremapfree(void *pt, unsigned long size, drm_device_t *dev)
165 int unmap_aperture = 0;
166 #if __REALLY_HAVE_AGP
168 * This is a bit ugly. It would be much cleaner if the DRM API would use separate
169 * routines for handling mappings in the AGP space. Hopefully this can be done in
170 * a future revision of the interface...
172 if (dev->agp->cant_use_aperture
173 && ((unsigned long) pt >= VMALLOC_START && (unsigned long) pt < VMALLOC_END))
175 unsigned long offset;
178 offset = drm_follow_page(pt) | ((unsigned long) pt & ~PAGE_MASK);
179 map = drm_lookup_map(offset, size, dev);
180 if (map && map->type == _DRM_AGP)
191 #include "drm_memory_debug.h"
193 void DRM(mem_init)(void)
197 /* drm_mem_info is called whenever a process reads /dev/drm/mem. */
198 int DRM(mem_info)(char *buf, char **start, off_t offset,
199 int len, int *eof, void *data)
204 void *DRM(alloc)(size_t size, int area)
206 return kmalloc(size, GFP_KERNEL);
209 void *DRM(realloc)(void *oldpt, size_t oldsize, size_t size, int area)
213 if (!(pt = kmalloc(size, GFP_KERNEL))) return NULL;
214 if (oldpt && oldsize) {
215 memcpy(pt, oldpt, oldsize);
221 void DRM(free)(void *pt, size_t size, int area)
226 unsigned long DRM(alloc_pages)(int order, int area)
228 unsigned long address;
229 unsigned long bytes = PAGE_SIZE << order;
233 address = __get_free_pages(GFP_KERNEL, order);
238 memset((void *)address, 0, bytes);
241 for (addr = address, sz = bytes;
243 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
244 SetPageReserved(virt_to_page(addr));
250 void DRM(free_pages)(unsigned long address, int order, int area)
252 unsigned long bytes = PAGE_SIZE << order;
260 for (addr = address, sz = bytes;
262 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
263 ClearPageReserved(virt_to_page(addr));
266 free_pages(address, order);
269 void *DRM(ioremap)(unsigned long offset, unsigned long size, drm_device_t *dev)
271 return drm_ioremap(offset, size, dev);
274 void *DRM(ioremap_nocache)(unsigned long offset, unsigned long size, drm_device_t *dev)
276 return drm_ioremap_nocache(offset, size, dev);
279 void DRM(ioremapfree)(void *pt, unsigned long size, drm_device_t *dev)
281 drm_ioremapfree(pt, size, dev);
284 #if __REALLY_HAVE_AGP
285 agp_memory *DRM(alloc_agp)(int pages, u32 type)
287 return DRM(agp_allocate_memory)(pages, type);
290 int DRM(free_agp)(agp_memory *handle, int pages)
292 return DRM(agp_free_memory)(handle) ? 0 : -EINVAL;
295 int DRM(bind_agp)(agp_memory *handle, unsigned int start)
297 return DRM(agp_bind_memory)(handle, start);
300 int DRM(unbind_agp)(agp_memory *handle)
302 return DRM(agp_unbind_memory)(handle);
305 #endif /* debug_memory */