1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
// SPDX-License-Identifier: GPL-2.0
/*
* raid6_vx$#.c
*
* $#-way unrolled RAID6 gen/xor functions for s390
* based on the vector facility
*
* Copyright IBM Corp. 2016
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*
* This file is postprocessed using unroll.awk.
*/
#include <linux/raid/pq.h>
#include <asm/fpu.h>
#define NSIZE 16
static inline void LOAD_CONST(void)
{
asm volatile("VREPIB %v24,7");
asm volatile("VREPIB %v25,0x1d");
}
/*
* The SHLBYTE() operation shifts each of the 16 bytes in
* vector register y left by 1 bit and stores the result in
* vector register x.
*/
static inline void SHLBYTE(int x, int y)
{
asm volatile ("VAB %0,%1,%1" : : "i" (x), "i" (y));
}
/*
* For each of the 16 bytes in the vector register y the MASK()
* operation returns 0xFF if the high bit of the byte is 1,
* or 0x00 if the high bit is 0. The result is stored in vector
* register x.
*/
static inline void MASK(int x, int y)
{
asm volatile ("VESRAVB %0,%1,24" : : "i" (x), "i" (y));
}
static inline void AND(int x, int y, int z)
{
asm volatile ("VN %0,%1,%2" : : "i" (x), "i" (y), "i" (z));
}
static inline void XOR(int x, int y, int z)
{
asm volatile ("VX %0,%1,%2" : : "i" (x), "i" (y), "i" (z));
}
static inline void LOAD_DATA(int x, u8 *ptr)
{
typedef struct { u8 _[16 * $#]; } addrtype;
register addrtype *__ptr asm("1") = (addrtype *) ptr;
asm volatile ("VLM %2,%3,0,%1"
: : "m" (*__ptr), "a" (__ptr), "i" (x),
"i" (x + $# - 1));
}
static inline void STORE_DATA(int x, u8 *ptr)
{
typedef struct { u8 _[16 * $#]; } addrtype;
register addrtype *__ptr asm("1") = (addrtype *) ptr;
asm volatile ("VSTM %2,%3,0,1"
: "=m" (*__ptr) : "a" (__ptr), "i" (x),
"i" (x + $# - 1));
}
static inline void COPY_VEC(int x, int y)
{
asm volatile ("VLR %0,%1" : : "i" (x), "i" (y));
}
static void raid6_s390vx$#_gen_syndrome(int disks, size_t bytes, void **ptrs)
{
DECLARE_KERNEL_FPU_ONSTACK(vxstate);
u8 **dptr, *p, *q;
int d, z, z0;
kernel_fpu_begin(&vxstate, KERNEL_VXR);
LOAD_CONST();
dptr = (u8 **) ptrs;
z0 = disks - 3; /* Highest data disk */
p = dptr[z0 + 1]; /* XOR parity */
q = dptr[z0 + 2]; /* RS syndrome */
for (d = 0; d < bytes; d += $#*NSIZE) {
LOAD_DATA(0,&dptr[z0][d]);
COPY_VEC(8+$$,0+$$);
for (z = z0 - 1; z >= 0; z--) {
MASK(16+$$,8+$$);
AND(16+$$,16+$$,25);
SHLBYTE(8+$$,8+$$);
XOR(8+$$,8+$$,16+$$);
LOAD_DATA(16,&dptr[z][d]);
XOR(0+$$,0+$$,16+$$);
XOR(8+$$,8+$$,16+$$);
}
STORE_DATA(0,&p[d]);
STORE_DATA(8,&q[d]);
}
kernel_fpu_end(&vxstate, KERNEL_VXR);
}
static void raid6_s390vx$#_xor_syndrome(int disks, int start, int stop,
size_t bytes, void **ptrs)
{
DECLARE_KERNEL_FPU_ONSTACK(vxstate);
u8 **dptr, *p, *q;
int d, z, z0;
dptr = (u8 **) ptrs;
z0 = stop; /* P/Q right side optimization */
p = dptr[disks - 2]; /* XOR parity */
q = dptr[disks - 1]; /* RS syndrome */
kernel_fpu_begin(&vxstate, KERNEL_VXR);
LOAD_CONST();
for (d = 0; d < bytes; d += $#*NSIZE) {
/* P/Q data pages */
LOAD_DATA(0,&dptr[z0][d]);
COPY_VEC(8+$$,0+$$);
for (z = z0 - 1; z >= start; z--) {
MASK(16+$$,8+$$);
AND(16+$$,16+$$,25);
SHLBYTE(8+$$,8+$$);
XOR(8+$$,8+$$,16+$$);
LOAD_DATA(16,&dptr[z][d]);
XOR(0+$$,0+$$,16+$$);
XOR(8+$$,8+$$,16+$$);
}
/* P/Q left side optimization */
for (z = start - 1; z >= 0; z--) {
MASK(16+$$,8+$$);
AND(16+$$,16+$$,25);
SHLBYTE(8+$$,8+$$);
XOR(8+$$,8+$$,16+$$);
}
LOAD_DATA(16,&p[d]);
XOR(16+$$,16+$$,0+$$);
STORE_DATA(16,&p[d]);
LOAD_DATA(16,&q[d]);
XOR(16+$$,16+$$,8+$$);
STORE_DATA(16,&q[d]);
}
kernel_fpu_end(&vxstate, KERNEL_VXR);
}
static int raid6_s390vx$#_valid(void)
{
return cpu_has_vx();
}
const struct raid6_calls raid6_s390vx$# = {
raid6_s390vx$#_gen_syndrome,
raid6_s390vx$#_xor_syndrome,
raid6_s390vx$#_valid,
"vx128x$#",
1
};
|
