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ramster.h
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1 /*
2  * ramster.h
3  *
4  * Peer-to-peer transcendent memory
5  *
6  * Copyright (c) 2009-2012, Dan Magenheimer, Oracle Corp.
7  */
8 
9 #ifndef _RAMSTER_RAMSTER_H_
10 #define _RAMSTER_RAMSTER_H_
11 
12 #include "../tmem.h"
13 
17 };
18 
21  struct list_head list;
22 };
23 
26  struct tmem_xhandle xh;
27 };
28 
31 };
32 
35  struct {
37  struct tmem_handle th;
38  } zbud_hdr;
40 };
41 
42 /*
43  * format of remote pampd:
44  * bit 0 is reserved for zbud (in-page buddy selection)
45  * bit 1 == intransit
46  * bit 2 == is_remote... if this bit is set, then
47  * bit 3-10 == remotenode
48  * bit 11-23 == size
49  * bit 24-31 == cksum
50  */
51 #define FAKE_PAMPD_INTRANSIT_BITS 1
52 #define FAKE_PAMPD_ISREMOTE_BITS 1
53 #define FAKE_PAMPD_REMOTENODE_BITS 8
54 #define FAKE_PAMPD_REMOTESIZE_BITS 13
55 #define FAKE_PAMPD_CHECKSUM_BITS 8
56 
57 #define FAKE_PAMPD_INTRANSIT_SHIFT 1
58 #define FAKE_PAMPD_ISREMOTE_SHIFT (FAKE_PAMPD_INTRANSIT_SHIFT + \
59  FAKE_PAMPD_INTRANSIT_BITS)
60 #define FAKE_PAMPD_REMOTENODE_SHIFT (FAKE_PAMPD_ISREMOTE_SHIFT + \
61  FAKE_PAMPD_ISREMOTE_BITS)
62 #define FAKE_PAMPD_REMOTESIZE_SHIFT (FAKE_PAMPD_REMOTENODE_SHIFT + \
63  FAKE_PAMPD_REMOTENODE_BITS)
64 #define FAKE_PAMPD_CHECKSUM_SHIFT (FAKE_PAMPD_REMOTESIZE_SHIFT + \
65  FAKE_PAMPD_REMOTESIZE_BITS)
66 
67 #define FAKE_PAMPD_MASK(x) ((1UL << (x)) - 1)
68 
69 static inline void *pampd_make_remote(int remotenode, size_t size,
70  unsigned char cksum)
71 {
72  unsigned long fake_pampd = 0;
73  fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT;
74  fake_pampd |= ((unsigned long)remotenode &
77  fake_pampd |= ((unsigned long)size &
80  fake_pampd |= ((unsigned long)cksum &
83  return (void *)fake_pampd;
84 }
85 
86 static inline unsigned int pampd_remote_node(void *pampd)
87 {
88  unsigned long fake_pampd = (unsigned long)pampd;
89  return (fake_pampd >> FAKE_PAMPD_REMOTENODE_SHIFT) &
91 }
92 
93 static inline unsigned int pampd_remote_size(void *pampd)
94 {
95  unsigned long fake_pampd = (unsigned long)pampd;
96  return (fake_pampd >> FAKE_PAMPD_REMOTESIZE_SHIFT) &
98 }
99 
100 static inline unsigned char pampd_remote_cksum(void *pampd)
101 {
102  unsigned long fake_pampd = (unsigned long)pampd;
103  return (fake_pampd >> FAKE_PAMPD_CHECKSUM_SHIFT) &
105 }
106 
107 static inline bool pampd_is_remote(void *pampd)
108 {
109  unsigned long fake_pampd = (unsigned long)pampd;
110  return (fake_pampd >> FAKE_PAMPD_ISREMOTE_SHIFT) &
112 }
113 
114 static inline bool pampd_is_intransit(void *pampd)
115 {
116  unsigned long fake_pampd = (unsigned long)pampd;
117  return (fake_pampd >> FAKE_PAMPD_INTRANSIT_SHIFT) &
119 }
120 
121 /* note that it is a BUG for intransit to be set without isremote also set */
122 static inline void *pampd_mark_intransit(void *pampd)
123 {
124  unsigned long fake_pampd = (unsigned long)pampd;
125 
126  fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT;
127  fake_pampd |= 1UL << FAKE_PAMPD_INTRANSIT_SHIFT;
128  return (void *)fake_pampd;
129 }
130 
131 static inline void *pampd_mask_intransit_and_remote(void *marked_pampd)
132 {
133  unsigned long pampd = (unsigned long)marked_pampd;
134 
135  pampd &= ~(1UL << FAKE_PAMPD_INTRANSIT_SHIFT);
136  pampd &= ~(1UL << FAKE_PAMPD_ISREMOTE_SHIFT);
137  return (void *)pampd;
138 }
139 
140 extern int r2net_remote_async_get(struct tmem_xhandle *,
141  bool, int, size_t, uint8_t, void *extra);
142 extern int r2net_remote_put(struct tmem_xhandle *, char *, size_t,
143  bool, int *);
144 extern int r2net_remote_flush(struct tmem_xhandle *, int);
145 extern int r2net_remote_flush_object(struct tmem_xhandle *, int);
146 extern int r2net_register_handlers(void);
147 extern int r2net_remote_target_node_set(int);
148 
149 extern int ramster_remotify_pageframe(bool);
150 extern void ramster_init(bool, bool, bool);
151 extern void ramster_register_pamops(struct tmem_pamops *);
152 extern int ramster_localify(int, struct tmem_oid *oidp, uint32_t, char *,
153  unsigned int, void *);
154 extern void *ramster_pampd_free(void *, struct tmem_pool *, struct tmem_oid *,
155  uint32_t, bool);
156 extern void ramster_count_foreign_pages(bool, int);
157 extern int ramster_do_preload_flnode(struct tmem_pool *);
158 extern void ramster_cpu_up(int);
159 extern void ramster_cpu_down(int);
160 
161 #endif /* _RAMSTER_RAMSTER_H */