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1/*
2 * Copyright (c) Red Hat Inc.
3
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sub license,
8 * and/or sell copies of the Software, and to permit persons to whom the

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34
35/* simple list based uncached page pool
36 * - Pool collects resently freed pages for reuse
37 * - Use page->lru to keep a free list
38 * - doesn't track currently in use pages
39 */
40
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: stable/10/sys/dev/drm2/ttm/ttm_page_alloc.c 254879 2013-08-25 15:33:17Z dumbbell $");
42__FBSDID("$FreeBSD: stable/10/sys/dev/drm2/ttm/ttm_page_alloc.c 275408 2014-12-02 14:09:54Z tijl $");
43
44#include <dev/drm2/drmP.h>
45#include <dev/drm2/ttm/ttm_bo_driver.h>
46#include <dev/drm2/ttm/ttm_page_alloc.h>
47
48#ifdef TTM_HAS_AGP
49#include <asm/agp.h>
50#endif
51
48#define NUM_PAGES_TO_ALLOC (PAGE_SIZE/sizeof(vm_page_t))
49#define SMALL_ALLOCATION 16
50#define FREE_ALL_PAGES (~0U)
51/* times are in msecs */
52#define PAGE_FREE_INTERVAL 1000
53
54/**
55 * struct ttm_page_pool - Pool to reuse recently allocated uc/wc pages.

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211 return snprintf(buffer, PAGE_SIZE, "%u\n", val);
212}
213#endif
214
215static struct ttm_pool_manager *_manager;
216
217static int set_pages_array_wb(vm_page_t *pages, int addrinarray)
218{
223 vm_page_t m;
219#ifdef TTM_HAS_AGP
220 int i;
221
226 for (i = 0; i < addrinarray; i++) {
227 m = pages[i];
228#ifdef TTM_HAS_AGP
229 unmap_page_from_agp(m);
222 for (i = 0; i < addrinarray; i++)
223 pmap_page_set_memattr(pages[i], VM_MEMATTR_WRITE_BACK);
224#endif
231 pmap_page_set_memattr(m, VM_MEMATTR_WRITE_BACK);
232 }
225 return 0;
226}
227
228static int set_pages_array_wc(vm_page_t *pages, int addrinarray)
229{
238 vm_page_t m;
230#ifdef TTM_HAS_AGP
231 int i;
232
241 for (i = 0; i < addrinarray; i++) {
242 m = pages[i];
243#ifdef TTM_HAS_AGP
244 map_page_into_agp(pages[i]);
233 for (i = 0; i < addrinarray; i++)
234 pmap_page_set_memattr(pages[i], VM_MEMATTR_WRITE_COMBINING);
235#endif
246 pmap_page_set_memattr(m, VM_MEMATTR_WRITE_COMBINING);
247 }
236 return 0;
237}
238
239static int set_pages_array_uc(vm_page_t *pages, int addrinarray)
240{
253 vm_page_t m;
241#ifdef TTM_HAS_AGP
242 int i;
243
256 for (i = 0; i < addrinarray; i++) {
257 m = pages[i];
258#ifdef TTM_HAS_AGP
259 map_page_into_agp(pages[i]);
244 for (i = 0; i < addrinarray; i++)
245 pmap_page_set_memattr(pages[i], VM_MEMATTR_UNCACHEABLE);
246#endif
261 pmap_page_set_memattr(m, VM_MEMATTR_UNCACHEABLE);
262 }
247 return 0;
248}
249
250/**
251 * Select the right pool or requested caching state and ttm flags. */
252static struct ttm_page_pool *ttm_get_pool(int flags,
253 enum ttm_caching_state cstate)
254{

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