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"),
18 * to deal in the Software without restriction, including without limitation
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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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27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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36 #define __NO_VERSION__
37 #include <linux/config.h>
38 #include <linux/highmem.h>
42 * Cut down version of drm_memory_debug.h, which used to be called
43 * drm_memory.h. If you want the debug functionality, change 0 to 1
46 #define DEBUG_MEMORY 0
48 /* Need the 4-argument version of vmap(). */
49 #if __OS_HAS_AGP && defined(VMAP_4_ARGS)
51 #include <linux/vmalloc.h>
57 # define PAGE_AGP __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
59 # define PAGE_AGP PAGE_KERNEL
63 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
64 #ifndef pte_offset_kernel
65 # define pte_offset_kernel(dir, address) pte_offset(dir, address)
68 # define pte_pfn(pte) (pte_page(pte) - mem_map)
71 # define pfn_to_page(pfn) (mem_map + (pfn))
76 * Find the drm_map that covers the range [offset, offset+size).
78 static inline drm_map_t *
79 drm_lookup_map (unsigned long offset, unsigned long size, drm_device_t *dev)
81 struct list_head *list;
82 drm_map_list_t *r_list;
85 list_for_each(list, &dev->maplist->head) {
86 r_list = (drm_map_list_t *) list;
90 if (map->offset <= offset && (offset + size) <= (map->offset + map->size))
97 agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev)
99 unsigned long *phys_addr_map, i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE;
100 struct drm_agp_mem *agpmem;
101 struct page **page_map;
104 size = PAGE_ALIGN(size);
107 offset -= dev->hose->mem_space->start;
110 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
111 if (agpmem->bound <= offset
112 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size))
118 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
119 * the CPU do not get remapped by the GART. We fix this by using the kernel's
120 * page-table instead (that's probably faster anyhow...).
122 /* note: use vmalloc() because num_pages could be large... */
123 page_map = vmalloc(num_pages * sizeof(struct page *));
127 phys_addr_map = agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
128 for (i = 0; i < num_pages; ++i)
129 page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
130 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
136 static inline unsigned long
137 drm_follow_page (void *vaddr)
139 pgd_t *pgd = pgd_offset_k((unsigned long) vaddr);
140 pmd_t *pmd = pmd_offset(pgd, (unsigned long) vaddr);
141 pte_t *ptep = pte_offset_kernel(pmd, (unsigned long) vaddr);
142 return pte_pfn(*ptep) << PAGE_SHIFT;
145 #endif /* __OS_HAS_AGP && defined(VMAP_4_ARGS) */
147 static inline void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t *dev)
149 #if __OS_HAS_AGP && defined(VMAP_4_ARGS)
150 if ( (dev->driver_features & DRIVER_USE_AGP) && dev->agp && dev->agp->cant_use_aperture) {
151 drm_map_t *map = drm_lookup_map(offset, size, dev);
153 if (map && map->type == _DRM_AGP)
154 return agp_remap(offset, size, dev);
158 return ioremap(offset, size);
161 static inline void *drm_ioremap_nocache(unsigned long offset, unsigned long size,
164 #if __OS_HAS_AGP&& defined(VMAP_4_ARGS)
165 if ( (dev->driver_features & DRIVER_USE_AGP) && dev->agp && dev->agp->cant_use_aperture) {
166 drm_map_t *map = drm_lookup_map(offset, size, dev);
168 if (map && map->type == _DRM_AGP)
169 return agp_remap(offset, size, dev);
173 return ioremap_nocache(offset, size);
176 static inline void drm_ioremapfree(void *pt, unsigned long size, drm_device_t *dev)
178 #if __OS_HAS_AGP && defined(VMAP_4_ARGS)
180 * This is a bit ugly. It would be much cleaner if the DRM API would use separate
181 * routines for handling mappings in the AGP space. Hopefully this can be done in
182 * a future revision of the interface...
184 if ((dev->driver_features & DRIVER_USE_AGP) && dev->agp && dev->agp->cant_use_aperture
185 && ((unsigned long) pt >= VMALLOC_START && (unsigned long) pt < VMALLOC_END))
187 unsigned long offset;
190 offset = drm_follow_page(pt) | ((unsigned long) pt & ~PAGE_MASK);
191 map = drm_lookup_map(offset, size, dev);
192 if (map && map->type == _DRM_AGP) {
204 #include "drm_memory_debug.h"
208 void DRM(mem_init)(void)
213 * Called when "/proc/dri/%dev%/mem" is read.
215 * \param buf output buffer.
216 * \param start start of output data.
217 * \param offset requested start offset.
218 * \param len requested number of bytes.
219 * \param eof whether there is no more data to return.
220 * \param data private data.
221 * \return number of written bytes.
225 int DRM(mem_info)(char *buf, char **start, off_t offset,
226 int len, int *eof, void *data)
231 /** Wrapper around kmalloc() */
232 void *DRM(alloc)(size_t size, int area)
234 return kmalloc(size, GFP_KERNEL);
237 /** Wrapper around kmalloc() */
238 void *DRM(calloc)(size_t size, size_t nmemb, int area)
242 addr = kmalloc(size * nmemb, GFP_KERNEL);
244 memset((void *)addr, 0, size * nmemb);
249 /** Wrapper around kmalloc() and kfree() */
250 void *DRM(realloc)(void *oldpt, size_t oldsize, size_t size, int area)
254 if (!(pt = kmalloc(size, GFP_KERNEL))) return NULL;
255 if (oldpt && oldsize) {
256 memcpy(pt, oldpt, oldsize);
262 /** Wrapper around kfree() */
263 void DRM(free)(void *pt, size_t size, int area)
271 * \param order size order.
272 * \param area memory area. (Not used.)
273 * \return page address on success, or zero on failure.
275 * Allocate and reserve free pages.
277 unsigned long DRM(alloc_pages)(int order, int area)
279 unsigned long address;
280 unsigned long bytes = PAGE_SIZE << order;
284 address = __get_free_pages(GFP_KERNEL, order);
289 memset((void *)address, 0, bytes);
292 for (addr = address, sz = bytes;
294 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
295 SetPageReserved(virt_to_page(addr));
304 * \param address address of the pages to free.
305 * \param order size order.
306 * \param area memory area. (Not used.)
308 * Unreserve and free pages allocated by alloc_pages().
310 void DRM(free_pages)(unsigned long address, int order, int area)
312 unsigned long bytes = PAGE_SIZE << order;
320 for (addr = address, sz = bytes;
322 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
323 ClearPageReserved(virt_to_page(addr));
326 free_pages(address, order);
329 /** Wrapper around drm_ioremap() */
330 void *DRM(ioremap)(unsigned long offset, unsigned long size, drm_device_t *dev)
332 return drm_ioremap(offset, size, dev);
335 /** Wrapper around drm_ioremap_nocache() */
336 void *DRM(ioremap_nocache)(unsigned long offset, unsigned long size, drm_device_t *dev)
338 return drm_ioremap_nocache(offset, size, dev);
341 /** Wrapper around drm_iounmap() */
342 void DRM(ioremapfree)(void *pt, unsigned long size, drm_device_t *dev)
344 drm_ioremapfree(pt, size, dev);
348 /** Wrapper around agp_allocate_memory() */
349 DRM_AGP_MEM *DRM(alloc_agp)(int pages, u32 type)
351 return DRM(agp_allocate_memory)(pages, type);
354 /** Wrapper around agp_free_memory() */
355 int DRM(free_agp)(DRM_AGP_MEM *handle, int pages)
357 return DRM(agp_free_memory)(handle) ? 0 : -EINVAL;
360 /** Wrapper around agp_bind_memory() */
361 int DRM(bind_agp)(DRM_AGP_MEM *handle, unsigned int start)
363 return DRM(agp_bind_memory)(handle, start);
366 /** Wrapper around agp_unbind_memory() */
367 int DRM(unbind_agp)(DRM_AGP_MEM *handle)
369 return DRM(agp_unbind_memory)(handle);
372 #endif /* debug_memory */