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1 | /* |
2 | * Copyright IBM Corp. 2008 |
3 | * |
4 | * Guest page hinting for unused pages. |
5 | * |
6 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> |
7 | */ |
8 | |
9 | #include <linux/kernel.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/types.h> |
12 | #include <linux/mm.h> |
13 | #include <linux/gfp.h> |
14 | #include <linux/init.h> |
15 | |
16 | #define ESSA_SET_STABLE 1 |
17 | #define ESSA_SET_UNUSED 2 |
18 | |
19 | static int cmma_flag = 1; |
20 | |
21 | static int __init cmma(char *str) |
22 | { |
23 | char *parm; |
24 | |
25 | parm = strstrip(str); |
26 | if (strcmp(parm, "yes") == 0 || strcmp(parm, "on") == 0) { |
27 | cmma_flag = 1; |
28 | return 1; |
29 | } |
30 | cmma_flag = 0; |
31 | if (strcmp(parm, "no") == 0 || strcmp(parm, "off") == 0) |
32 | return 1; |
33 | return 0; |
34 | } |
35 | __setup("cmma=", cmma); |
36 | |
37 | void __init cmma_init(void) |
38 | { |
39 | register unsigned long tmp asm("0") = 0; |
40 | register int rc asm("1") = -EOPNOTSUPP; |
41 | |
42 | if (!cmma_flag) |
43 | return; |
44 | asm volatile( |
45 | " .insn rrf,0xb9ab0000,%1,%1,0,0\n" |
46 | "0: la %0,0\n" |
47 | "1:\n" |
48 | EX_TABLE(0b,1b) |
49 | : "+&d" (rc), "+&d" (tmp)); |
50 | if (rc) |
51 | cmma_flag = 0; |
52 | } |
53 | |
54 | static inline void set_page_unstable(struct page *page, int order) |
55 | { |
56 | int i, rc; |
57 | |
58 | for (i = 0; i < (1 << order); i++) |
59 | asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0" |
60 | : "=&d" (rc) |
61 | : "a" (page_to_phys(page + i)), |
62 | "i" (ESSA_SET_UNUSED)); |
63 | } |
64 | |
65 | void arch_free_page(struct page *page, int order) |
66 | { |
67 | if (!cmma_flag) |
68 | return; |
69 | set_page_unstable(page, order); |
70 | } |
71 | |
72 | static inline void set_page_stable(struct page *page, int order) |
73 | { |
74 | int i, rc; |
75 | |
76 | for (i = 0; i < (1 << order); i++) |
77 | asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0" |
78 | : "=&d" (rc) |
79 | : "a" (page_to_phys(page + i)), |
80 | "i" (ESSA_SET_STABLE)); |
81 | } |
82 | |
83 | void arch_alloc_page(struct page *page, int order) |
84 | { |
85 | if (!cmma_flag) |
86 | return; |
87 | set_page_stable(page, order); |
88 | } |
89 | |
90 | void arch_set_page_states(int make_stable) |
91 | { |
92 | unsigned long flags, order, t; |
93 | struct list_head *l; |
94 | struct page *page; |
95 | struct zone *zone; |
96 | |
97 | if (!cmma_flag) |
98 | return; |
99 | if (make_stable) |
100 | drain_local_pages(NULL); |
101 | for_each_populated_zone(zone) { |
102 | spin_lock_irqsave(&zone->lock, flags); |
103 | for_each_migratetype_order(order, t) { |
104 | list_for_each(l, &zone->free_area[order].free_list[t]) { |
105 | page = list_entry(l, struct page, lru); |
106 | if (make_stable) |
107 | set_page_stable(page, order); |
108 | else |
109 | set_page_unstable(page, order); |
110 | } |
111 | } |
112 | spin_unlock_irqrestore(&zone->lock, flags); |
113 | } |
114 | } |
115 |
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v2.6.34-rc5
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