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
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
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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
42 * drm_memory.h. If you want the debug functionality, change 0 to 1
45 #define DEBUG_MEMORY 0
49 #include <linux/vmalloc.h>
55 # define PAGE_AGP __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
57 # define PAGE_AGP PAGE_KERNEL
61 #include <asm/tlbflush.h>
64 * Find the drm_map that covers the range [offset, offset+size).
66 static inline drm_map_t *
67 drm_lookup_map (unsigned long offset, unsigned long size, drm_device_t *dev)
69 struct list_head *list;
70 drm_map_list_t *r_list;
73 list_for_each(list, &dev->maplist->head) {
74 r_list = (drm_map_list_t *) list;
78 if (map->offset <= offset && (offset + size) <= (map->offset + map->size))
85 agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev)
87 unsigned long *phys_addr_map, i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE;
88 struct drm_agp_mem *agpmem;
89 struct page **page_map;
92 size = PAGE_ALIGN(size);
95 offset -= dev->hose->mem_space->start;
98 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
99 if (agpmem->bound <= offset
100 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size))
106 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
107 * the CPU do not get remapped by the GART. We fix this by using the kernel's
108 * page-table instead (that's probably faster anyhow...).
110 /* note: use vmalloc() because num_pages could be large... */
111 page_map = vmalloc(num_pages * sizeof(struct page *));
115 phys_addr_map = agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
116 for (i = 0; i < num_pages; ++i)
117 page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
118 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
124 static inline unsigned long
125 drm_follow_page (void *vaddr)
127 pgd_t *pgd = pgd_offset_k((unsigned long) vaddr);
128 pmd_t *pmd = pmd_offset(pgd, (unsigned long) vaddr);
129 pte_t *ptep = pte_offset_kernel(pmd, (unsigned long) vaddr);
130 return pte_pfn(*ptep) << PAGE_SHIFT;
133 #else /* __OS_HAS_AGP */
135 static inline drm_map_t *drm_lookup_map(unsigned long offset, unsigned long size, drm_device_t *dev)
140 static inline void *agp_remap(unsigned long offset, unsigned long size, drm_device_t *dev)
145 static inline unsigned long drm_follow_page (void *vaddr)
152 static inline void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t *dev)
154 if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
155 drm_map_t *map = drm_lookup_map(offset, size, dev);
157 if (map && map->type == _DRM_AGP)
158 return agp_remap(offset, size, dev);
160 return ioremap(offset, size);
163 static inline void *drm_ioremap_nocache(unsigned long offset, unsigned long size,
166 if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
167 drm_map_t *map = drm_lookup_map(offset, size, dev);
169 if (map && map->type == _DRM_AGP)
170 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)
178 * This is a bit ugly. It would be much cleaner if the DRM API would use separate
179 * routines for handling mappings in the AGP space. Hopefully this can be done in
180 * a future revision of the interface...
182 if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture
183 && ((unsigned long) pt >= VMALLOC_START && (unsigned long) pt < VMALLOC_END))
185 unsigned long offset;
188 offset = drm_follow_page(pt) | ((unsigned long) pt & ~PAGE_MASK);
189 map = drm_lookup_map(offset, size, dev);
190 if (map && map->type == _DRM_AGP) {
201 #include "drm_memory_debug.h"
205 void DRM(mem_init)(void)
210 * Called when "/proc/dri/%dev%/mem" is read.
212 * \param buf output buffer.
213 * \param start start of output data.
214 * \param offset requested start offset.
215 * \param len requested number of bytes.
216 * \param eof whether there is no more data to return.
217 * \param data private data.
218 * \return number of written bytes.
222 int DRM(mem_info)(char *buf, char **start, off_t offset,
223 int len, int *eof, void *data)
228 /** Wrapper around kmalloc() */
229 void *DRM(alloc)(size_t size, int area)
231 return kmalloc(size, GFP_KERNEL);
234 /** Wrapper around kmalloc() */
235 void *DRM(calloc)(size_t size, size_t nmemb, int area)
239 addr = kmalloc(size * nmemb, GFP_KERNEL);
241 memset((void *)addr, 0, size * nmemb);
246 /** Wrapper around kmalloc() and kfree() */
247 void *DRM(realloc)(void *oldpt, size_t oldsize, size_t size, int area)
251 if (!(pt = kmalloc(size, GFP_KERNEL))) return NULL;
252 if (oldpt && oldsize) {
253 memcpy(pt, oldpt, oldsize);
259 /** Wrapper around kfree() */
260 void DRM(free)(void *pt, size_t size, int area)
268 * \param order size order.
269 * \param area memory area. (Not used.)
270 * \return page address on success, or zero on failure.
272 * Allocate and reserve free pages.
274 unsigned long DRM(alloc_pages)(int order, int area)
276 unsigned long address;
277 unsigned long bytes = PAGE_SIZE << order;
281 address = __get_free_pages(GFP_KERNEL, order);
286 memset((void *)address, 0, bytes);
289 for (addr = address, sz = bytes;
291 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
292 SetPageReserved(virt_to_page(addr));
301 * \param address address of the pages to free.
302 * \param order size order.
303 * \param area memory area. (Not used.)
305 * Unreserve and free pages allocated by alloc_pages().
307 void DRM(free_pages)(unsigned long address, int order, int area)
309 unsigned long bytes = PAGE_SIZE << order;
317 for (addr = address, sz = bytes;
319 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
320 ClearPageReserved(virt_to_page(addr));
323 free_pages(address, order);
326 /** Wrapper around drm_ioremap() */
327 void *DRM(ioremap)(unsigned long offset, unsigned long size, drm_device_t *dev)
329 return drm_ioremap(offset, size, dev);
332 /** Wrapper around drm_ioremap_nocache() */
333 void *DRM(ioremap_nocache)(unsigned long offset, unsigned long size, drm_device_t *dev)
335 return drm_ioremap_nocache(offset, size, dev);
338 /** Wrapper around drm_iounmap() */
339 void DRM(ioremapfree)(void *pt, unsigned long size, drm_device_t *dev)
341 drm_ioremapfree(pt, size, dev);
345 /** Wrapper around agp_allocate_memory() */
346 DRM_AGP_MEM *DRM(alloc_agp)(int pages, u32 type)
348 return DRM(agp_allocate_memory)(pages, type);
351 /** Wrapper around agp_free_memory() */
352 int DRM(free_agp)(DRM_AGP_MEM *handle, int pages)
354 return DRM(agp_free_memory)(handle) ? 0 : -EINVAL;
357 /** Wrapper around agp_bind_memory() */
358 int DRM(bind_agp)(DRM_AGP_MEM *handle, unsigned int start)
360 return DRM(agp_bind_memory)(handle, start);
363 /** Wrapper around agp_unbind_memory() */
364 int DRM(unbind_agp)(DRM_AGP_MEM *handle)
366 return DRM(agp_unbind_memory)(handle);
369 #endif /* debug_memory */