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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36 #define __NO_VERSION__
37 #include <linux/config.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 __REALLY_HAVE_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 # include <asm/tlbflush.h>
65 # define pte_offset_kernel(dir, address) pte_offset(dir, address)
66 # define pte_pfn(pte) (pte_page(pte) - mem_map)
67 # define pfn_to_page(pfn) (mem_map + (pfn))
68 # define flush_tlb_kernel_range(s,e) flush_tlb_all()
72 * Find the drm_map that covers the range [offset, offset+size).
74 static inline drm_map_t *
75 drm_lookup_map (unsigned long offset, unsigned long size, drm_device_t *dev)
77 struct list_head *list;
78 drm_map_list_t *r_list;
81 list_for_each(list, &dev->maplist->head) {
82 r_list = (drm_map_list_t *) list;
86 if (map->offset <= offset && (offset + size) <= (map->offset + map->size))
93 agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev)
95 unsigned long *phys_addr_map, i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE;
96 struct drm_agp_mem *agpmem;
97 struct page **page_map;
100 size = PAGE_ALIGN(size);
103 offset -= dev->hose->mem_space->start;
106 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
107 if (agpmem->bound <= offset
108 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size))
114 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
115 * the CPU do not get remapped by the GART. We fix this by using the kernel's
116 * page-table instead (that's probably faster anyhow...).
118 /* note: use vmalloc() because num_pages could be large... */
119 page_map = vmalloc(num_pages * sizeof(struct page *));
123 phys_addr_map = agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
124 for (i = 0; i < num_pages; ++i)
125 page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
126 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
131 flush_tlb_kernel_range((unsigned long) addr, (unsigned long) addr + size);
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 /* __REALLY_HAVE_AGP && defined(VMAP_4_ARGS) */
146 static inline void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t *dev)
148 #if __REALLY_HAVE_AGP && defined(VMAP_4_ARGS)
149 if (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 __REALLY_HAVE_AGP && defined(VMAP_4_ARGS)
164 if (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 __REALLY_HAVE_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->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) {
202 #include "drm_memory_debug.h"
206 void DRM(mem_init)(void)
211 * Called when "/proc/dri/%dev%/mem" is read.
213 * \param buf output buffer.
214 * \param start start of output data.
215 * \param offset requested start offset.
216 * \param len requested number of bytes.
217 * \param eof whether there is no more data to return.
218 * \param data private data.
219 * \return number of written bytes.
223 int DRM(mem_info)(char *buf, char **start, off_t offset,
224 int len, int *eof, void *data)
229 /** Wrapper around kmalloc() */
230 void *DRM(alloc)(size_t size, int area)
232 return kmalloc(size, GFP_KERNEL);
235 /** Wrapper around kmalloc() and kfree() */
236 void *DRM(realloc)(void *oldpt, size_t oldsize, size_t size, int area)
240 if (!(pt = kmalloc(size, GFP_KERNEL))) return NULL;
241 if (oldpt && oldsize) {
242 memcpy(pt, oldpt, oldsize);
248 /** Wrapper around kfree() */
249 void DRM(free)(void *pt, size_t size, int area)
257 * \param order size order.
258 * \param area memory area. (Not used.)
259 * \return page address on success, or zero on failure.
261 * Allocate and reserve free pages.
263 unsigned long DRM(alloc_pages)(int order, int area)
265 unsigned long address;
266 unsigned long bytes = PAGE_SIZE << order;
270 address = __get_free_pages(GFP_KERNEL, order);
275 memset((void *)address, 0, bytes);
278 for (addr = address, sz = bytes;
280 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
281 SetPageReserved(virt_to_page(addr));
290 * \param address address of the pages to free.
291 * \param order size order.
292 * \param area memory area. (Not used.)
294 * Unreserve and free pages allocated by alloc_pages().
296 void DRM(free_pages)(unsigned long address, int order, int area)
298 unsigned long bytes = PAGE_SIZE << order;
306 for (addr = address, sz = bytes;
308 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
309 ClearPageReserved(virt_to_page(addr));
312 free_pages(address, order);
315 /** Wrapper around drm_ioremap() */
316 void *DRM(ioremap)(unsigned long offset, unsigned long size, drm_device_t *dev)
318 return drm_ioremap(offset, size, dev);
321 /** Wrapper around drm_ioremap_nocache() */
322 void *DRM(ioremap_nocache)(unsigned long offset, unsigned long size, drm_device_t *dev)
324 return drm_ioremap_nocache(offset, size, dev);
327 /** Wrapper around drm_iounmap() */
328 void DRM(ioremapfree)(void *pt, unsigned long size, drm_device_t *dev)
330 drm_ioremapfree(pt, size, dev);
333 #if __REALLY_HAVE_AGP
334 /** Wrapper around agp_allocate_memory() */
335 DRM_AGP_MEM *DRM(alloc_agp)(int pages, u32 type)
337 return DRM(agp_allocate_memory)(pages, type);
340 /** Wrapper around agp_free_memory() */
341 int DRM(free_agp)(DRM_AGP_MEM *handle, int pages)
343 return DRM(agp_free_memory)(handle) ? 0 : -EINVAL;
346 /** Wrapper around agp_bind_memory() */
347 int DRM(bind_agp)(DRM_AGP_MEM *handle, unsigned int start)
349 return DRM(agp_bind_memory)(handle, start);
352 /** Wrapper around agp_unbind_memory() */
353 int DRM(unbind_agp)(DRM_AGP_MEM *handle)
355 return DRM(agp_unbind_memory)(handle);
358 #endif /* debug_memory */