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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * raid6_vx$#.c
4 *
5 * $#-way unrolled RAID6 gen/xor functions for s390
6 * based on the vector facility
7 *
8 * Copyright IBM Corp. 2016
9 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *
11 * This file is postprocessed using unroll.awk.
12 */
13
14#include <linux/raid/pq.h>
15#include <asm/fpu.h>
16
17#define NSIZE 16
18
19static __always_inline void LOAD_CONST(void)
20{
21 fpu_vrepib(24, 0x07);
22 fpu_vrepib(25, 0x1d);
23}
24
25/*
26 * The SHLBYTE() operation shifts each of the 16 bytes in
27 * vector register y left by 1 bit and stores the result in
28 * vector register x.
29 */
30#define SHLBYTE(x, y) fpu_vab(x, y, y)
31
32/*
33 * For each of the 16 bytes in the vector register y the MASK()
34 * operation returns 0xFF if the high bit of the byte is 1,
35 * or 0x00 if the high bit is 0. The result is stored in vector
36 * register x.
37 */
38#define MASK(x, y) fpu_vesravb(x, y, 24)
39
40#define AND(x, y, z) fpu_vn(x, y, z)
41#define XOR(x, y, z) fpu_vx(x, y, z)
42#define LOAD_DATA(x, ptr) fpu_vlm(x, x + $# - 1, ptr)
43#define STORE_DATA(x, ptr) fpu_vstm(x, x + $# - 1, ptr)
44#define COPY_VEC(x, y) fpu_vlr(x, y)
45
46static void raid6_s390vx$#_gen_syndrome(int disks, size_t bytes, void **ptrs)
47{
48 DECLARE_KERNEL_FPU_ONSTACK32(vxstate);
49 u8 **dptr, *p, *q;
50 int d, z, z0;
51
52 kernel_fpu_begin(&vxstate, KERNEL_VXR);
53 LOAD_CONST();
54
55 dptr = (u8 **) ptrs;
56 z0 = disks - 3; /* Highest data disk */
57 p = dptr[z0 + 1]; /* XOR parity */
58 q = dptr[z0 + 2]; /* RS syndrome */
59
60 for (d = 0; d < bytes; d += $#*NSIZE) {
61 LOAD_DATA(0,&dptr[z0][d]);
62 COPY_VEC(8+$$,0+$$);
63 for (z = z0 - 1; z >= 0; z--) {
64 MASK(16+$$,8+$$);
65 AND(16+$$,16+$$,25);
66 SHLBYTE(8+$$,8+$$);
67 XOR(8+$$,8+$$,16+$$);
68 LOAD_DATA(16,&dptr[z][d]);
69 XOR(0+$$,0+$$,16+$$);
70 XOR(8+$$,8+$$,16+$$);
71 }
72 STORE_DATA(0,&p[d]);
73 STORE_DATA(8,&q[d]);
74 }
75 kernel_fpu_end(&vxstate, KERNEL_VXR);
76}
77
78static void raid6_s390vx$#_xor_syndrome(int disks, int start, int stop,
79 size_t bytes, void **ptrs)
80{
81 DECLARE_KERNEL_FPU_ONSTACK32(vxstate);
82 u8 **dptr, *p, *q;
83 int d, z, z0;
84
85 dptr = (u8 **) ptrs;
86 z0 = stop; /* P/Q right side optimization */
87 p = dptr[disks - 2]; /* XOR parity */
88 q = dptr[disks - 1]; /* RS syndrome */
89
90 kernel_fpu_begin(&vxstate, KERNEL_VXR);
91 LOAD_CONST();
92
93 for (d = 0; d < bytes; d += $#*NSIZE) {
94 /* P/Q data pages */
95 LOAD_DATA(0,&dptr[z0][d]);
96 COPY_VEC(8+$$,0+$$);
97 for (z = z0 - 1; z >= start; z--) {
98 MASK(16+$$,8+$$);
99 AND(16+$$,16+$$,25);
100 SHLBYTE(8+$$,8+$$);
101 XOR(8+$$,8+$$,16+$$);
102 LOAD_DATA(16,&dptr[z][d]);
103 XOR(0+$$,0+$$,16+$$);
104 XOR(8+$$,8+$$,16+$$);
105 }
106 /* P/Q left side optimization */
107 for (z = start - 1; z >= 0; z--) {
108 MASK(16+$$,8+$$);
109 AND(16+$$,16+$$,25);
110 SHLBYTE(8+$$,8+$$);
111 XOR(8+$$,8+$$,16+$$);
112 }
113 LOAD_DATA(16,&p[d]);
114 XOR(16+$$,16+$$,0+$$);
115 STORE_DATA(16,&p[d]);
116 LOAD_DATA(16,&q[d]);
117 XOR(16+$$,16+$$,8+$$);
118 STORE_DATA(16,&q[d]);
119 }
120 kernel_fpu_end(&vxstate, KERNEL_VXR);
121}
122
123static int raid6_s390vx$#_valid(void)
124{
125 return cpu_has_vx();
126}
127
128const struct raid6_calls raid6_s390vx$# = {
129 raid6_s390vx$#_gen_syndrome,
130 raid6_s390vx$#_xor_syndrome,
131 raid6_s390vx$#_valid,
132 "vx128x$#",
133 1
134};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * raid6_vx$#.c
4 *
5 * $#-way unrolled RAID6 gen/xor functions for s390
6 * based on the vector facility
7 *
8 * Copyright IBM Corp. 2016
9 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *
11 * This file is postprocessed using unroll.awk.
12 */
13
14#include <linux/raid/pq.h>
15#include <asm/fpu/api.h>
16
17asm(".include \"asm/vx-insn.h\"\n");
18
19#define NSIZE 16
20
21static inline void LOAD_CONST(void)
22{
23 asm volatile("VREPIB %v24,7");
24 asm volatile("VREPIB %v25,0x1d");
25}
26
27/*
28 * The SHLBYTE() operation shifts each of the 16 bytes in
29 * vector register y left by 1 bit and stores the result in
30 * vector register x.
31 */
32static inline void SHLBYTE(int x, int y)
33{
34 asm volatile ("VAB %0,%1,%1" : : "i" (x), "i" (y));
35}
36
37/*
38 * For each of the 16 bytes in the vector register y the MASK()
39 * operation returns 0xFF if the high bit of the byte is 1,
40 * or 0x00 if the high bit is 0. The result is stored in vector
41 * register x.
42 */
43static inline void MASK(int x, int y)
44{
45 asm volatile ("VESRAVB %0,%1,24" : : "i" (x), "i" (y));
46}
47
48static inline void AND(int x, int y, int z)
49{
50 asm volatile ("VN %0,%1,%2" : : "i" (x), "i" (y), "i" (z));
51}
52
53static inline void XOR(int x, int y, int z)
54{
55 asm volatile ("VX %0,%1,%2" : : "i" (x), "i" (y), "i" (z));
56}
57
58static inline void LOAD_DATA(int x, u8 *ptr)
59{
60 typedef struct { u8 _[16 * $#]; } addrtype;
61 register addrtype *__ptr asm("1") = (addrtype *) ptr;
62
63 asm volatile ("VLM %2,%3,0,%1"
64 : : "m" (*__ptr), "a" (__ptr), "i" (x),
65 "i" (x + $# - 1));
66}
67
68static inline void STORE_DATA(int x, u8 *ptr)
69{
70 typedef struct { u8 _[16 * $#]; } addrtype;
71 register addrtype *__ptr asm("1") = (addrtype *) ptr;
72
73 asm volatile ("VSTM %2,%3,0,1"
74 : "=m" (*__ptr) : "a" (__ptr), "i" (x),
75 "i" (x + $# - 1));
76}
77
78static inline void COPY_VEC(int x, int y)
79{
80 asm volatile ("VLR %0,%1" : : "i" (x), "i" (y));
81}
82
83static void raid6_s390vx$#_gen_syndrome(int disks, size_t bytes, void **ptrs)
84{
85 struct kernel_fpu vxstate;
86 u8 **dptr, *p, *q;
87 int d, z, z0;
88
89 kernel_fpu_begin(&vxstate, KERNEL_VXR);
90 LOAD_CONST();
91
92 dptr = (u8 **) ptrs;
93 z0 = disks - 3; /* Highest data disk */
94 p = dptr[z0 + 1]; /* XOR parity */
95 q = dptr[z0 + 2]; /* RS syndrome */
96
97 for (d = 0; d < bytes; d += $#*NSIZE) {
98 LOAD_DATA(0,&dptr[z0][d]);
99 COPY_VEC(8+$$,0+$$);
100 for (z = z0 - 1; z >= 0; z--) {
101 MASK(16+$$,8+$$);
102 AND(16+$$,16+$$,25);
103 SHLBYTE(8+$$,8+$$);
104 XOR(8+$$,8+$$,16+$$);
105 LOAD_DATA(16,&dptr[z][d]);
106 XOR(0+$$,0+$$,16+$$);
107 XOR(8+$$,8+$$,16+$$);
108 }
109 STORE_DATA(0,&p[d]);
110 STORE_DATA(8,&q[d]);
111 }
112 kernel_fpu_end(&vxstate, KERNEL_VXR);
113}
114
115static void raid6_s390vx$#_xor_syndrome(int disks, int start, int stop,
116 size_t bytes, void **ptrs)
117{
118 struct kernel_fpu vxstate;
119 u8 **dptr, *p, *q;
120 int d, z, z0;
121
122 dptr = (u8 **) ptrs;
123 z0 = stop; /* P/Q right side optimization */
124 p = dptr[disks - 2]; /* XOR parity */
125 q = dptr[disks - 1]; /* RS syndrome */
126
127 kernel_fpu_begin(&vxstate, KERNEL_VXR);
128 LOAD_CONST();
129
130 for (d = 0; d < bytes; d += $#*NSIZE) {
131 /* P/Q data pages */
132 LOAD_DATA(0,&dptr[z0][d]);
133 COPY_VEC(8+$$,0+$$);
134 for (z = z0 - 1; z >= start; z--) {
135 MASK(16+$$,8+$$);
136 AND(16+$$,16+$$,25);
137 SHLBYTE(8+$$,8+$$);
138 XOR(8+$$,8+$$,16+$$);
139 LOAD_DATA(16,&dptr[z][d]);
140 XOR(0+$$,0+$$,16+$$);
141 XOR(8+$$,8+$$,16+$$);
142 }
143 /* P/Q left side optimization */
144 for (z = start - 1; z >= 0; z--) {
145 MASK(16+$$,8+$$);
146 AND(16+$$,16+$$,25);
147 SHLBYTE(8+$$,8+$$);
148 XOR(8+$$,8+$$,16+$$);
149 }
150 LOAD_DATA(16,&p[d]);
151 XOR(16+$$,16+$$,0+$$);
152 STORE_DATA(16,&p[d]);
153 LOAD_DATA(16,&q[d]);
154 XOR(16+$$,16+$$,8+$$);
155 STORE_DATA(16,&q[d]);
156 }
157 kernel_fpu_end(&vxstate, KERNEL_VXR);
158}
159
160static int raid6_s390vx$#_valid(void)
161{
162 return MACHINE_HAS_VX;
163}
164
165const struct raid6_calls raid6_s390vx$# = {
166 raid6_s390vx$#_gen_syndrome,
167 raid6_s390vx$#_xor_syndrome,
168 raid6_s390vx$#_valid,
169 "vx128x$#",
170 1
171};