3 * Memory management wrappers for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
36 #include <linux/config.h>
37 #include <linux/highmem.h>
41 * Cut down version of drm_memory_debug.h, which used to be called
42 * drm_memory.h. If you want the debug functionality, change 0 to 1
45 #define DEBUG_MEMORY 0
47 /* Need the 4-argument version of vmap(). */
48 #if __OS_HAS_AGP && defined(VMAP_4_ARGS)
50 #include <linux/vmalloc.h>
56 # define PAGE_AGP __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
58 # define PAGE_AGP PAGE_KERNEL
62 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
63 #ifndef pte_offset_kernel
64 # define pte_offset_kernel(dir, address) pte_offset(dir, address)
67 # define pte_pfn(pte) (pte_page(pte) - mem_map)
70 # define pfn_to_page(pfn) (mem_map + (pfn))
75 * Find the drm_map that covers the range [offset, offset+size).
77 static inline drm_map_t *
78 drm_lookup_map (unsigned long offset, unsigned long size, drm_device_t *dev)
80 struct list_head *list;
81 drm_map_list_t *r_list;
84 list_for_each(list, &dev->maplist->head) {
85 r_list = (drm_map_list_t *) list;
89 if (map->offset <= offset && (offset + size) <= (map->offset + map->size))
96 agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev)
98 unsigned long *phys_addr_map, i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE;
99 struct drm_agp_mem *agpmem;
100 struct page **page_map;
103 size = PAGE_ALIGN(size);
106 offset -= dev->hose->mem_space->start;
109 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
110 if (agpmem->bound <= offset
111 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size))
117 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
118 * the CPU do not get remapped by the GART. We fix this by using the kernel's
119 * page-table instead (that's probably faster anyhow...).
121 /* note: use vmalloc() because num_pages could be large... */
122 page_map = vmalloc(num_pages * sizeof(struct page *));
126 phys_addr_map = agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
127 for (i = 0; i < num_pages; ++i)
128 page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
129 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
135 static inline unsigned long
136 drm_follow_page (void *vaddr)
138 pgd_t *pgd = pgd_offset_k((unsigned long) vaddr);
139 pmd_t *pmd = pmd_offset(pgd, (unsigned long) vaddr);
140 pte_t *ptep = pte_offset_kernel(pmd, (unsigned long) vaddr);
141 return pte_pfn(*ptep) << PAGE_SHIFT;
144 #endif /* __OS_HAS_AGP && defined(VMAP_4_ARGS) */
146 static inline void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t *dev)
148 #if __OS_HAS_AGP && defined(VMAP_4_ARGS)
149 if ( (dev->driver_features & DRIVER_USE_AGP) && dev->agp && dev->agp->cant_use_aperture) {
150 drm_map_t *map = drm_lookup_map(offset, size, dev);
152 if (map && map->type == _DRM_AGP)
153 return agp_remap(offset, size, dev);
157 return ioremap(offset, size);
160 static inline void *drm_ioremap_nocache(unsigned long offset, unsigned long size,
163 #if __OS_HAS_AGP&& defined(VMAP_4_ARGS)
164 if ( (dev->driver_features & DRIVER_USE_AGP) && dev->agp && dev->agp->cant_use_aperture) {
165 drm_map_t *map = drm_lookup_map(offset, size, dev);
167 if (map && map->type == _DRM_AGP)
168 return agp_remap(offset, size, dev);
172 return ioremap_nocache(offset, size);
175 static inline void drm_ioremapfree(void *pt, unsigned long size, drm_device_t *dev)
177 #if __OS_HAS_AGP && defined(VMAP_4_ARGS)
179 * This is a bit ugly. It would be much cleaner if the DRM API would use separate
180 * routines for handling mappings in the AGP space. Hopefully this can be done in
181 * a future revision of the interface...
183 if ((dev->driver_features & DRIVER_USE_AGP) && dev->agp && dev->agp->cant_use_aperture
184 && ((unsigned long) pt >= VMALLOC_START && (unsigned long) pt < VMALLOC_END))
186 unsigned long offset;
189 offset = drm_follow_page(pt) | ((unsigned long) pt & ~PAGE_MASK);
190 map = drm_lookup_map(offset, size, dev);
191 if (map && map->type == _DRM_AGP) {
203 #include "drm_memory_debug.h"
207 void DRM(mem_init)(void)
212 * Called when "/proc/dri/%dev%/mem" is read.
214 * \param buf output buffer.
215 * \param start start of output data.
216 * \param offset requested start offset.
217 * \param len requested number of bytes.
218 * \param eof whether there is no more data to return.
219 * \param data private data.
220 * \return number of written bytes.
224 int DRM(mem_info)(char *buf, char **start, off_t offset,
225 int len, int *eof, void *data)
230 /** Wrapper around kmalloc() */
231 void *DRM(alloc)(size_t size, int area)
233 return kmalloc(size, GFP_KERNEL);
236 /** Wrapper around kmalloc() */
237 void *DRM(calloc)(size_t size, size_t nmemb, int area)
241 addr = kmalloc(size * nmemb, GFP_KERNEL);
243 memset((void *)addr, 0, size * nmemb);
248 /** Wrapper around kmalloc() and kfree() */
249 void *DRM(realloc)(void *oldpt, size_t oldsize, size_t size, int area)
253 if (!(pt = kmalloc(size, GFP_KERNEL))) return NULL;
254 if (oldpt && oldsize) {
255 memcpy(pt, oldpt, oldsize);
261 /** Wrapper around kfree() */
262 void DRM(free)(void *pt, size_t size, int area)
270 * \param order size order.
271 * \param area memory area. (Not used.)
272 * \return page address on success, or zero on failure.
274 * Allocate and reserve free pages.
276 unsigned long DRM(alloc_pages)(int order, int area)
278 unsigned long address;
279 unsigned long bytes = PAGE_SIZE << order;
283 address = __get_free_pages(GFP_KERNEL, order);
288 memset((void *)address, 0, bytes);
291 for (addr = address, sz = bytes;
293 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
294 SetPageReserved(virt_to_page(addr));
303 * \param address address of the pages to free.
304 * \param order size order.
305 * \param area memory area. (Not used.)
307 * Unreserve and free pages allocated by alloc_pages().
309 void DRM(free_pages)(unsigned long address, int order, int area)
311 unsigned long bytes = PAGE_SIZE << order;
319 for (addr = address, sz = bytes;
321 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
322 ClearPageReserved(virt_to_page(addr));
325 free_pages(address, order);
328 /** Wrapper around drm_ioremap() */
329 void *DRM(ioremap)(unsigned long offset, unsigned long size, drm_device_t *dev)
331 return drm_ioremap(offset, size, dev);
334 /** Wrapper around drm_ioremap_nocache() */
335 void *DRM(ioremap_nocache)(unsigned long offset, unsigned long size, drm_device_t *dev)
337 return drm_ioremap_nocache(offset, size, dev);
340 /** Wrapper around drm_iounmap() */
341 void DRM(ioremapfree)(void *pt, unsigned long size, drm_device_t *dev)
343 drm_ioremapfree(pt, size, dev);
347 /** Wrapper around agp_allocate_memory() */
348 DRM_AGP_MEM *DRM(alloc_agp)(int pages, u32 type)
350 return DRM(agp_allocate_memory)(pages, type);
353 /** Wrapper around agp_free_memory() */
354 int DRM(free_agp)(DRM_AGP_MEM *handle, int pages)
356 return DRM(agp_free_memory)(handle) ? 0 : -EINVAL;
359 /** Wrapper around agp_bind_memory() */
360 int DRM(bind_agp)(DRM_AGP_MEM *handle, unsigned int start)
362 return DRM(agp_bind_memory)(handle, start);
365 /** Wrapper around agp_unbind_memory() */
366 int DRM(unbind_agp)(DRM_AGP_MEM *handle)
368 return DRM(agp_unbind_memory)(handle);
371 #endif /* debug_memory */