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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
474fd6e8 MS |
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 | ||
17 | asm(".include \"asm/vx-insn.h\"\n"); | |
18 | ||
19 | #define NSIZE 16 | |
20 | ||
21 | static 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 | */ | |
32 | static 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 | */ | |
43 | static inline void MASK(int x, int y) | |
44 | { | |
45 | asm volatile ("VESRAVB %0,%1,24" : : "i" (x), "i" (y)); | |
46 | } | |
47 | ||
48 | static 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 | ||
53 | static 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 | ||
58 | static inline void LOAD_DATA(int x, int n, u8 *ptr) | |
59 | { | |
60 | typedef struct { u8 _[16*n]; } addrtype; | |
61 | register addrtype *__ptr asm("1") = (addrtype *) ptr; | |
62 | ||
63 | asm volatile ("VLM %2,%3,0,%r1" | |
64 | : : "m" (*__ptr), "a" (__ptr), "i" (x), "i" (x + n - 1)); | |
65 | } | |
66 | ||
67 | static inline void STORE_DATA(int x, int n, u8 *ptr) | |
68 | { | |
69 | typedef struct { u8 _[16*n]; } addrtype; | |
70 | register addrtype *__ptr asm("1") = (addrtype *) ptr; | |
71 | ||
72 | asm volatile ("VSTM %2,%3,0,1" | |
73 | : "=m" (*__ptr) : "a" (__ptr), "i" (x), "i" (x + n - 1)); | |
74 | } | |
75 | ||
76 | static inline void COPY_VEC(int x, int y) | |
77 | { | |
78 | asm volatile ("VLR %0,%1" : : "i" (x), "i" (y)); | |
79 | } | |
80 | ||
81 | static void raid6_s390vx$#_gen_syndrome(int disks, size_t bytes, void **ptrs) | |
82 | { | |
83 | struct kernel_fpu vxstate; | |
84 | u8 **dptr, *p, *q; | |
85 | int d, z, z0; | |
86 | ||
87 | kernel_fpu_begin(&vxstate, KERNEL_VXR); | |
88 | LOAD_CONST(); | |
89 | ||
90 | dptr = (u8 **) ptrs; | |
91 | z0 = disks - 3; /* Highest data disk */ | |
92 | p = dptr[z0 + 1]; /* XOR parity */ | |
93 | q = dptr[z0 + 2]; /* RS syndrome */ | |
94 | ||
95 | for (d = 0; d < bytes; d += $#*NSIZE) { | |
96 | LOAD_DATA(0,$#,&dptr[z0][d]); | |
97 | COPY_VEC(8+$$,0+$$); | |
98 | for (z = z0 - 1; z >= 0; z--) { | |
99 | MASK(16+$$,8+$$); | |
100 | AND(16+$$,16+$$,25); | |
101 | SHLBYTE(8+$$,8+$$); | |
102 | XOR(8+$$,8+$$,16+$$); | |
103 | LOAD_DATA(16,$#,&dptr[z][d]); | |
104 | XOR(0+$$,0+$$,16+$$); | |
105 | XOR(8+$$,8+$$,16+$$); | |
106 | } | |
107 | STORE_DATA(0,$#,&p[d]); | |
108 | STORE_DATA(8,$#,&q[d]); | |
109 | } | |
110 | kernel_fpu_end(&vxstate, KERNEL_VXR); | |
111 | } | |
112 | ||
113 | static void raid6_s390vx$#_xor_syndrome(int disks, int start, int stop, | |
114 | size_t bytes, void **ptrs) | |
115 | { | |
116 | struct kernel_fpu vxstate; | |
117 | u8 **dptr, *p, *q; | |
118 | int d, z, z0; | |
119 | ||
120 | dptr = (u8 **) ptrs; | |
121 | z0 = stop; /* P/Q right side optimization */ | |
122 | p = dptr[disks - 2]; /* XOR parity */ | |
123 | q = dptr[disks - 1]; /* RS syndrome */ | |
124 | ||
125 | kernel_fpu_begin(&vxstate, KERNEL_VXR); | |
126 | LOAD_CONST(); | |
127 | ||
128 | for (d = 0; d < bytes; d += $#*NSIZE) { | |
129 | /* P/Q data pages */ | |
130 | LOAD_DATA(0,$#,&dptr[z0][d]); | |
131 | COPY_VEC(8+$$,0+$$); | |
132 | for (z = z0 - 1; z >= start; z--) { | |
133 | MASK(16+$$,8+$$); | |
134 | AND(16+$$,16+$$,25); | |
135 | SHLBYTE(8+$$,8+$$); | |
136 | XOR(8+$$,8+$$,16+$$); | |
137 | LOAD_DATA(16,$#,&dptr[z][d]); | |
138 | XOR(0+$$,0+$$,16+$$); | |
139 | XOR(8+$$,8+$$,16+$$); | |
140 | } | |
141 | /* P/Q left side optimization */ | |
142 | for (z = start - 1; z >= 0; z--) { | |
143 | MASK(16+$$,8+$$); | |
144 | AND(16+$$,16+$$,25); | |
145 | SHLBYTE(8+$$,8+$$); | |
146 | XOR(8+$$,8+$$,16+$$); | |
147 | } | |
148 | LOAD_DATA(16,$#,&p[d]); | |
149 | XOR(16+$$,16+$$,0+$$); | |
150 | STORE_DATA(16,$#,&p[d]); | |
151 | LOAD_DATA(16,$#,&q[d]); | |
152 | XOR(16+$$,16+$$,8+$$); | |
153 | STORE_DATA(16,$#,&q[d]); | |
154 | } | |
155 | kernel_fpu_end(&vxstate, KERNEL_VXR); | |
156 | } | |
157 | ||
158 | static int raid6_s390vx$#_valid(void) | |
159 | { | |
160 | return MACHINE_HAS_VX; | |
161 | } | |
162 | ||
163 | const struct raid6_calls raid6_s390vx$# = { | |
164 | raid6_s390vx$#_gen_syndrome, | |
165 | raid6_s390vx$#_xor_syndrome, | |
166 | raid6_s390vx$#_valid, | |
167 | "vx128x$#", | |
168 | 1 | |
169 | }; |