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.
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17 * copy of this software and associated documentation files (the "Software"),
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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
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36 #include <linux/config.h>
37 #include <linux/highmem.h>
41 * Cut down version of drm_memory_debug.h, which used to be called
45 /* Need the 4-argument version of vmap(). */
46 #if __OS_HAS_AGP && defined(VMAP_4_ARGS)
48 #include <linux/vmalloc.h>
54 # define PAGE_AGP __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
56 # define PAGE_AGP PAGE_KERNEL
60 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
61 #ifndef pte_offset_kernel
62 # define pte_offset_kernel(dir, address) pte_offset(dir, address)
65 # define pte_pfn(pte) (pte_page(pte) - mem_map)
68 # define pfn_to_page(pfn) (mem_map + (pfn))
73 * Find the drm_map that covers the range [offset, offset+size).
75 static inline drm_map_t *
76 drm_lookup_map (unsigned long offset, unsigned long size, drm_device_t *dev)
78 struct list_head *list;
79 drm_map_list_t *r_list;
82 list_for_each(list, &dev->maplist->head) {
83 r_list = (drm_map_list_t *) list;
87 if (map->offset <= offset && (offset + size) <= (map->offset + map->size))
94 agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev)
96 unsigned long *phys_addr_map, i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE;
97 struct drm_agp_mem *agpmem;
98 struct page **page_map;
101 size = PAGE_ALIGN(size);
104 offset -= dev->hose->mem_space->start;
107 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
108 if (agpmem->bound <= offset
109 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size))
115 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
116 * the CPU do not get remapped by the GART. We fix this by using the kernel's
117 * page-table instead (that's probably faster anyhow...).
119 /* note: use vmalloc() because num_pages could be large... */
120 page_map = vmalloc(num_pages * sizeof(struct page *));
124 phys_addr_map = agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
125 for (i = 0; i < num_pages; ++i)
126 page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
127 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
133 static inline unsigned long
134 drm_follow_page (void *vaddr)
136 pgd_t *pgd = pgd_offset_k((unsigned long) vaddr);
137 pmd_t *pmd = pmd_offset(pgd, (unsigned long) vaddr);
138 pte_t *ptep = pte_offset_kernel(pmd, (unsigned long) vaddr);
139 return pte_pfn(*ptep) << PAGE_SHIFT;
142 #else /* __OS_HAS_AGP */
144 static inline drm_map_t *drm_lookup_map(unsigned long offset, unsigned long size, drm_device_t *dev)
149 static inline void *agp_remap(unsigned long offset, unsigned long size, drm_device_t *dev)
154 static inline unsigned long drm_follow_page (void *vaddr)
161 static inline void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t *dev)
163 #if defined(VMAP_4_ARGS)
164 if (drm_core_has_AGP(dev) && 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(offset, size);
175 static inline void *drm_ioremap_nocache(unsigned long offset, unsigned long size,
178 #if defined(VMAP_4_ARGS)
179 if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
180 drm_map_t *map = drm_lookup_map(offset, size, dev);
182 if (map && map->type == _DRM_AGP)
183 return agp_remap(offset, size, dev);
187 return ioremap_nocache(offset, size);
190 static inline void drm_ioremapfree(void *pt, unsigned long size, drm_device_t *dev)
192 #if defined(VMAP_4_ARGS)
194 * This is a bit ugly. It would be much cleaner if the DRM API would use separate
195 * routines for handling mappings in the AGP space. Hopefully this can be done in
196 * a future revision of the interface...
198 if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture
199 && ((unsigned long) pt >= VMALLOC_START && (unsigned long) pt < VMALLOC_END))
201 unsigned long offset;
204 offset = drm_follow_page(pt) | ((unsigned long) pt & ~PAGE_MASK);
205 map = drm_lookup_map(offset, size, dev);
206 if (map && map->type == _DRM_AGP) {
218 #include "drm_memory_debug.h"
222 void DRM(mem_init)(void)
227 * Called when "/proc/dri/%dev%/mem" is read.
229 * \param buf output buffer.
230 * \param start start of output data.
231 * \param offset requested start offset.
232 * \param len requested number of bytes.
233 * \param eof whether there is no more data to return.
234 * \param data private data.
235 * \return number of written bytes.
239 int DRM(mem_info)(char *buf, char **start, off_t offset,
240 int len, int *eof, void *data)
245 /** Wrapper around kmalloc() */
246 void *DRM(calloc)(size_t nmemb, size_t size, int area)
250 addr = kmalloc(size * nmemb, GFP_KERNEL);
252 memset((void *)addr, 0, size * nmemb);
257 /** Wrapper around kmalloc() and kfree() */
258 void *DRM(realloc)(void *oldpt, size_t oldsize, size_t size, int area)
262 if (!(pt = kmalloc(size, GFP_KERNEL))) return NULL;
263 if (oldpt && oldsize) {
264 memcpy(pt, oldpt, oldsize);
273 * \param order size order.
274 * \param area memory area. (Not used.)
275 * \return page address on success, or zero on failure.
277 * Allocate and reserve free pages.
279 unsigned long DRM(alloc_pages)(int order, int area)
281 unsigned long address;
282 unsigned long bytes = PAGE_SIZE << order;
286 address = __get_free_pages(GFP_KERNEL, order);
291 memset((void *)address, 0, bytes);
294 for (addr = address, sz = bytes;
296 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
297 SetPageReserved(virt_to_page(addr));
306 * \param address address of the pages to free.
307 * \param order size order.
308 * \param area memory area. (Not used.)
310 * Unreserve and free pages allocated by alloc_pages().
312 void DRM(free_pages)(unsigned long address, int order, int area)
314 unsigned long bytes = PAGE_SIZE << order;
322 for (addr = address, sz = bytes;
324 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
325 ClearPageReserved(virt_to_page(addr));
328 free_pages(address, order);
331 /** Wrapper around drm_ioremap() */
332 void *DRM(ioremap)(unsigned long offset, unsigned long size, drm_device_t *dev)
334 return drm_ioremap(offset, size, dev);
337 /** Wrapper around drm_ioremap_nocache() */
338 void *DRM(ioremap_nocache)(unsigned long offset, unsigned long size, drm_device_t *dev)
340 return drm_ioremap_nocache(offset, size, dev);
343 /** Wrapper around drm_iounmap() */
344 void DRM(ioremapfree)(void *pt, unsigned long size, drm_device_t *dev)
346 drm_ioremapfree(pt, size, dev);
350 /** Wrapper around agp_allocate_memory() */
351 DRM_AGP_MEM *DRM(alloc_agp)(int pages, u32 type)
353 return DRM(agp_allocate_memory)(pages, type);
356 /** Wrapper around agp_free_memory() */
357 int DRM(free_agp)(DRM_AGP_MEM *handle, int pages)
359 return DRM(agp_free_memory)(handle) ? 0 : -EINVAL;
362 /** Wrapper around agp_bind_memory() */
363 int DRM(bind_agp)(DRM_AGP_MEM *handle, unsigned int start)
365 return DRM(agp_bind_memory)(handle, start);
368 /** Wrapper around agp_unbind_memory() */
369 int DRM(unbind_agp)(DRM_AGP_MEM *handle)
371 return DRM(agp_unbind_memory)(handle);
374 #endif /* debug_memory */