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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | // 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/api.h> asm(".include \"asm/vx-insn.h\"\n"); #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) { struct kernel_fpu 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+$$); } STORE_DATA(0,&p[d]); STORE_DATA(8,&q[d]); } kernel_fpu_end(&vxstate, KERNEL_VXR); } static void raid6_s390vx$#_xor_syndrome(int disks, int start, int stop, size_t bytes, void **ptrs) { struct kernel_fpu vxstate; u8 **dptr, *p, *q; int d, z, z0; dptr = (u8 **) ptrs; z0 = stop; /* P/Q right side optimization */ p = dptr[disks - 2]; /* XOR parity */ q = dptr[disks - 1]; /* RS syndrome */ kernel_fpu_begin(&vxstate, KERNEL_VXR); LOAD_CONST(); for (d = 0; d < bytes; d += $#*NSIZE) { /* P/Q data pages */ LOAD_DATA(0,&dptr[z0][d]); COPY_VEC(8+$$,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$#_valid(void) { return MACHINE_HAS_VX; } const struct raid6_calls raid6_s390vx$# = { raid6_s390vx$#_gen_syndrome, raid6_s390vx$#_xor_syndrome, raid6_s390vx$#_valid, "vx128x$#", 1 }; |