1 /* -*- linux-c -*- --------------------------- 1 /* -*- linux-c -*- ------------------------------------------------------- *
2 * 2 *
3 * Copyright 2002-2004 H. Peter Anvin - All 3 * Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
4 * 4 *
5 * This program is free software; you can re 5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Pub 6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, Inc., 53 Te 7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 * Boston MA 02111-1307, USA; either version 8 * Boston MA 02111-1307, USA; either version 2 of the License, or
9 * (at your option) any later version; incor 9 * (at your option) any later version; incorporated herein by reference.
10 * 10 *
11 * ------------------------------------------- 11 * ----------------------------------------------------------------------- */
12 12
13 /* 13 /*
14 * int$#.c 14 * int$#.c
15 * 15 *
16 * $#-way unrolled portable integer math RAID- 16 * $#-way unrolled portable integer math RAID-6 instruction set
17 * 17 *
18 * This file is postprocessed using unroll.awk 18 * This file is postprocessed using unroll.awk
19 */ 19 */
20 20
21 #include <linux/raid/pq.h> 21 #include <linux/raid/pq.h>
22 22
23 /* 23 /*
24 * This is the C data type to use 24 * This is the C data type to use
25 */ 25 */
26 26
27 /* Change this from BITS_PER_LONG if there is 27 /* Change this from BITS_PER_LONG if there is something better... */
28 #if BITS_PER_LONG == 64 28 #if BITS_PER_LONG == 64
29 # define NBYTES(x) ((x) * 0x0101010101010101UL 29 # define NBYTES(x) ((x) * 0x0101010101010101UL)
30 # define NSIZE 8 30 # define NSIZE 8
31 # define NSHIFT 3 31 # define NSHIFT 3
32 # define NSTRING "64" 32 # define NSTRING "64"
33 typedef u64 unative_t; 33 typedef u64 unative_t;
34 #else 34 #else
35 # define NBYTES(x) ((x) * 0x01010101U) 35 # define NBYTES(x) ((x) * 0x01010101U)
36 # define NSIZE 4 36 # define NSIZE 4
37 # define NSHIFT 2 37 # define NSHIFT 2
38 # define NSTRING "32" 38 # define NSTRING "32"
39 typedef u32 unative_t; 39 typedef u32 unative_t;
40 #endif 40 #endif
41 41
42 42
43 43
44 /* 44 /*
45 * These sub-operations are separate inlines s 45 * These sub-operations are separate inlines since they can sometimes be
46 * specially optimized using architecture-spec 46 * specially optimized using architecture-specific hacks.
47 */ 47 */
48 48
49 /* 49 /*
50 * The SHLBYTE() operation shifts each byte le 50 * The SHLBYTE() operation shifts each byte left by 1, *not*
51 * rolling over into the next byte 51 * rolling over into the next byte
52 */ 52 */
53 static inline __attribute_const__ unative_t SH 53 static inline __attribute_const__ unative_t SHLBYTE(unative_t v)
54 { 54 {
55 unative_t vv; 55 unative_t vv;
56 56
57 vv = (v << 1) & NBYTES(0xfe); 57 vv = (v << 1) & NBYTES(0xfe);
58 return vv; 58 return vv;
59 } 59 }
60 60
61 /* 61 /*
62 * The MASK() operation returns 0xFF in any by 62 * The MASK() operation returns 0xFF in any byte for which the high
63 * bit is 1, 0x00 for any byte for which the h 63 * bit is 1, 0x00 for any byte for which the high bit is 0.
64 */ 64 */
65 static inline __attribute_const__ unative_t MA 65 static inline __attribute_const__ unative_t MASK(unative_t v)
66 { 66 {
67 unative_t vv; 67 unative_t vv;
68 68
69 vv = v & NBYTES(0x80); 69 vv = v & NBYTES(0x80);
70 vv = (vv << 1) - (vv >> 7); /* Overflo 70 vv = (vv << 1) - (vv >> 7); /* Overflow on the top bit is OK */
71 return vv; 71 return vv;
72 } 72 }
73 73
74 74
75 static void raid6_int$#_gen_syndrome(int disks 75 static void raid6_int$#_gen_syndrome(int disks, size_t bytes, void **ptrs)
76 { 76 {
77 u8 **dptr = (u8 **)ptrs; 77 u8 **dptr = (u8 **)ptrs;
78 u8 *p, *q; 78 u8 *p, *q;
79 int d, z, z0; 79 int d, z, z0;
80 80
81 unative_t wd$$, wq$$, wp$$, w1$$, w2$$ 81 unative_t wd$$, wq$$, wp$$, w1$$, w2$$;
82 82
83 z0 = disks - 3; /* Highest dat 83 z0 = disks - 3; /* Highest data disk */
84 p = dptr[z0+1]; /* XOR parity 84 p = dptr[z0+1]; /* XOR parity */
85 q = dptr[z0+2]; /* RS syndrome 85 q = dptr[z0+2]; /* RS syndrome */
86 86
87 for ( d = 0 ; d < bytes ; d += NSIZE*$ 87 for ( d = 0 ; d < bytes ; d += NSIZE*$# ) {
88 wq$$ = wp$$ = *(unative_t *)&d 88 wq$$ = wp$$ = *(unative_t *)&dptr[z0][d+$$*NSIZE];
89 for ( z = z0-1 ; z >= 0 ; z-- 89 for ( z = z0-1 ; z >= 0 ; z-- ) {
90 wd$$ = *(unative_t *)& 90 wd$$ = *(unative_t *)&dptr[z][d+$$*NSIZE];
91 wp$$ ^= wd$$; 91 wp$$ ^= wd$$;
92 w2$$ = MASK(wq$$); 92 w2$$ = MASK(wq$$);
93 w1$$ = SHLBYTE(wq$$); 93 w1$$ = SHLBYTE(wq$$);
94 w2$$ &= NBYTES(0x1d); 94 w2$$ &= NBYTES(0x1d);
95 w1$$ ^= w2$$; 95 w1$$ ^= w2$$;
96 wq$$ = w1$$ ^ wd$$; 96 wq$$ = w1$$ ^ wd$$;
97 } 97 }
98 *(unative_t *)&p[d+NSIZE*$$] = 98 *(unative_t *)&p[d+NSIZE*$$] = wp$$;
99 *(unative_t *)&q[d+NSIZE*$$] = 99 *(unative_t *)&q[d+NSIZE*$$] = wq$$;
100 } 100 }
101 } 101 }
102 102
103 static void raid6_int$#_xor_syndrome(int disks 103 static void raid6_int$#_xor_syndrome(int disks, int start, int stop,
104 size_t by 104 size_t bytes, void **ptrs)
105 { 105 {
106 u8 **dptr = (u8 **)ptrs; 106 u8 **dptr = (u8 **)ptrs;
107 u8 *p, *q; 107 u8 *p, *q;
108 int d, z, z0; 108 int d, z, z0;
109 109
110 unative_t wd$$, wq$$, wp$$, w1$$, w2$$ 110 unative_t wd$$, wq$$, wp$$, w1$$, w2$$;
111 111
112 z0 = stop; /* P/Q right s 112 z0 = stop; /* P/Q right side optimization */
113 p = dptr[disks-2]; /* XOR parity 113 p = dptr[disks-2]; /* XOR parity */
114 q = dptr[disks-1]; /* RS syndrome 114 q = dptr[disks-1]; /* RS syndrome */
115 115
116 for ( d = 0 ; d < bytes ; d += NSIZE*$ 116 for ( d = 0 ; d < bytes ; d += NSIZE*$# ) {
117 /* P/Q data pages */ 117 /* P/Q data pages */
118 wq$$ = wp$$ = *(unative_t *)&d 118 wq$$ = wp$$ = *(unative_t *)&dptr[z0][d+$$*NSIZE];
119 for ( z = z0-1 ; z >= start ; 119 for ( z = z0-1 ; z >= start ; z-- ) {
120 wd$$ = *(unative_t *)& 120 wd$$ = *(unative_t *)&dptr[z][d+$$*NSIZE];
121 wp$$ ^= wd$$; 121 wp$$ ^= wd$$;
122 w2$$ = MASK(wq$$); 122 w2$$ = MASK(wq$$);
123 w1$$ = SHLBYTE(wq$$); 123 w1$$ = SHLBYTE(wq$$);
124 w2$$ &= NBYTES(0x1d); 124 w2$$ &= NBYTES(0x1d);
125 w1$$ ^= w2$$; 125 w1$$ ^= w2$$;
126 wq$$ = w1$$ ^ wd$$; 126 wq$$ = w1$$ ^ wd$$;
127 } 127 }
128 /* P/Q left side optimization 128 /* P/Q left side optimization */
129 for ( z = start-1 ; z >= 0 ; z 129 for ( z = start-1 ; z >= 0 ; z-- ) {
130 w2$$ = MASK(wq$$); 130 w2$$ = MASK(wq$$);
131 w1$$ = SHLBYTE(wq$$); 131 w1$$ = SHLBYTE(wq$$);
132 w2$$ &= NBYTES(0x1d); 132 w2$$ &= NBYTES(0x1d);
133 wq$$ = w1$$ ^ w2$$; 133 wq$$ = w1$$ ^ w2$$;
134 } 134 }
135 *(unative_t *)&p[d+NSIZE*$$] ^ 135 *(unative_t *)&p[d+NSIZE*$$] ^= wp$$;
136 *(unative_t *)&q[d+NSIZE*$$] ^ 136 *(unative_t *)&q[d+NSIZE*$$] ^= wq$$;
137 } 137 }
138 138
139 } 139 }
140 140
141 const struct raid6_calls raid6_intx$# = { 141 const struct raid6_calls raid6_intx$# = {
142 raid6_int$#_gen_syndrome, 142 raid6_int$#_gen_syndrome,
143 raid6_int$#_xor_syndrome, 143 raid6_int$#_xor_syndrome,
144 NULL, /* always vali 144 NULL, /* always valid */
145 "int" NSTRING "x$#", 145 "int" NSTRING "x$#",
146 0 146 0
147 }; 147 };
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