| /* |
| * CDDL HEADER START |
| * |
| * The contents of this file are subject to the terms of the |
| * Common Development and Distribution License (the "License"). |
| * You may not use this file except in compliance with the License. |
| * |
| * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
| * or http://www.opensolaris.org/os/licensing. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * |
| * When distributing Covered Code, include this CDDL HEADER in each |
| * file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
| * If applicable, add the following below this CDDL HEADER, with the |
| * fields enclosed by brackets "[]" replaced with your own identifying |
| * information: Portions Copyright [yyyy] [name of copyright owner] |
| * |
| * CDDL HEADER END |
| */ |
| |
| /* |
| * Copyright (C) 2016 Gvozden Nešković. All rights reserved. |
| */ |
| |
| #include <sys/vdev_raidz_impl.h> |
| |
| /* |
| * Provide native CPU scalar routines. |
| * Support 32bit and 64bit CPUs. |
| */ |
| #if ((~(0x0ULL)) >> 24) == 0xffULL |
| #define ELEM_SIZE 4 |
| typedef uint32_t iv_t; |
| #elif ((~(0x0ULL)) >> 56) == 0xffULL |
| #define ELEM_SIZE 8 |
| typedef uint64_t iv_t; |
| #endif |
| |
| /* |
| * Vector type used in scalar implementation |
| * |
| * The union is expected to be of native CPU register size. Since addition |
| * uses XOR operation, it can be performed an all byte elements at once. |
| * Multiplication requires per byte access. |
| */ |
| typedef union { |
| iv_t e; |
| uint8_t b[ELEM_SIZE]; |
| } v_t; |
| |
| /* |
| * Precomputed lookup tables for multiplication by a constant |
| * |
| * Reconstruction path requires multiplication by a constant factors. Instead of |
| * performing two step lookup (log & exp tables), a direct lookup can be used |
| * instead. Multiplication of element 'a' by a constant 'c' is obtained as: |
| * |
| * r = vdev_raidz_mul_lt[c_log][a]; |
| * |
| * where c_log = vdev_raidz_log2[c]. Log of coefficient factors is used because |
| * they are faster to obtain while solving the syndrome equations. |
| * |
| * PERFORMANCE NOTE: |
| * Even though the complete lookup table uses 64kiB, only relatively small |
| * portion of it is used at the same time. Following shows number of accessed |
| * bytes for different cases: |
| * - 1 failed disk: 256B (1 mul. coefficient) |
| * - 2 failed disks: 512B (2 mul. coefficients) |
| * - 3 failed disks: 1536B (6 mul. coefficients) |
| * |
| * Size of actually accessed lookup table regions is only larger for |
| * reconstruction of 3 failed disks, when compared to traditional log/exp |
| * method. But since the result is obtained in one lookup step performance is |
| * doubled. |
| */ |
| static uint8_t vdev_raidz_mul_lt[256][256] __attribute__((aligned(256))); |
| |
| static void |
| raidz_init_scalar(void) |
| { |
| int c, i; |
| for (c = 0; c < 256; c++) |
| for (i = 0; i < 256; i++) |
| vdev_raidz_mul_lt[c][i] = gf_mul(c, i); |
| |
| } |
| |
| #define PREFETCHNTA(ptr, offset) {} |
| #define PREFETCH(ptr, offset) {} |
| |
| #define XOR_ACC(src, acc) acc.e ^= ((v_t *)src)[0].e |
| #define XOR(src, acc) acc.e ^= src.e |
| #define ZERO(acc) acc.e = 0 |
| #define COPY(src, dst) dst = src |
| #define LOAD(src, val) val = ((v_t *)src)[0] |
| #define STORE(dst, val) ((v_t *)dst)[0] = val |
| |
| /* |
| * Constants used for optimized multiplication by 2. |
| */ |
| static const struct { |
| iv_t mod; |
| iv_t mask; |
| iv_t msb; |
| } scalar_mul2_consts = { |
| #if ELEM_SIZE == 8 |
| .mod = 0x1d1d1d1d1d1d1d1dULL, |
| .mask = 0xfefefefefefefefeULL, |
| .msb = 0x8080808080808080ULL, |
| #else |
| .mod = 0x1d1d1d1dULL, |
| .mask = 0xfefefefeULL, |
| .msb = 0x80808080ULL, |
| #endif |
| }; |
| |
| #define MUL2_SETUP() {} |
| |
| #define MUL2(a) \ |
| { \ |
| iv_t _mask; \ |
| \ |
| _mask = (a).e & scalar_mul2_consts.msb; \ |
| _mask = (_mask << 1) - (_mask >> 7); \ |
| (a).e = ((a).e << 1) & scalar_mul2_consts.mask; \ |
| (a).e = (a).e ^ (_mask & scalar_mul2_consts.mod); \ |
| } |
| |
| #define MUL4(a) \ |
| { \ |
| MUL2(a); \ |
| MUL2(a); \ |
| } |
| |
| #define MUL(c, a) \ |
| { \ |
| const uint8_t *mul_lt = vdev_raidz_mul_lt[c]; \ |
| switch (ELEM_SIZE) { \ |
| case 8: \ |
| a.b[7] = mul_lt[a.b[7]]; \ |
| a.b[6] = mul_lt[a.b[6]]; \ |
| a.b[5] = mul_lt[a.b[5]]; \ |
| a.b[4] = mul_lt[a.b[4]]; \ |
| fallthrough; \ |
| case 4: \ |
| a.b[3] = mul_lt[a.b[3]]; \ |
| a.b[2] = mul_lt[a.b[2]]; \ |
| a.b[1] = mul_lt[a.b[1]]; \ |
| a.b[0] = mul_lt[a.b[0]]; \ |
| break; \ |
| } \ |
| } |
| |
| #define raidz_math_begin() {} |
| #define raidz_math_end() {} |
| |
| #define SYN_STRIDE 1 |
| |
| #define ZERO_DEFINE() v_t d0 |
| #define ZERO_STRIDE 1 |
| #define ZERO_D d0 |
| |
| #define COPY_DEFINE() v_t d0 |
| #define COPY_STRIDE 1 |
| #define COPY_D d0 |
| |
| #define ADD_DEFINE() v_t d0 |
| #define ADD_STRIDE 1 |
| #define ADD_D d0 |
| |
| #define MUL_DEFINE() v_t d0 |
| #define MUL_STRIDE 1 |
| #define MUL_D d0 |
| |
| #define GEN_P_STRIDE 1 |
| #define GEN_P_DEFINE() v_t p0 |
| #define GEN_P_P p0 |
| |
| #define GEN_PQ_STRIDE 1 |
| #define GEN_PQ_DEFINE() v_t d0, c0 |
| #define GEN_PQ_D d0 |
| #define GEN_PQ_C c0 |
| |
| #define GEN_PQR_STRIDE 1 |
| #define GEN_PQR_DEFINE() v_t d0, c0 |
| #define GEN_PQR_D d0 |
| #define GEN_PQR_C c0 |
| |
| #define SYN_Q_DEFINE() v_t d0, x0 |
| #define SYN_Q_D d0 |
| #define SYN_Q_X x0 |
| |
| |
| #define SYN_R_DEFINE() v_t d0, x0 |
| #define SYN_R_D d0 |
| #define SYN_R_X x0 |
| |
| |
| #define SYN_PQ_DEFINE() v_t d0, x0 |
| #define SYN_PQ_D d0 |
| #define SYN_PQ_X x0 |
| |
| |
| #define REC_PQ_STRIDE 1 |
| #define REC_PQ_DEFINE() v_t x0, y0, t0 |
| #define REC_PQ_X x0 |
| #define REC_PQ_Y y0 |
| #define REC_PQ_T t0 |
| |
| |
| #define SYN_PR_DEFINE() v_t d0, x0 |
| #define SYN_PR_D d0 |
| #define SYN_PR_X x0 |
| |
| #define REC_PR_STRIDE 1 |
| #define REC_PR_DEFINE() v_t x0, y0, t0 |
| #define REC_PR_X x0 |
| #define REC_PR_Y y0 |
| #define REC_PR_T t0 |
| |
| |
| #define SYN_QR_DEFINE() v_t d0, x0 |
| #define SYN_QR_D d0 |
| #define SYN_QR_X x0 |
| |
| |
| #define REC_QR_STRIDE 1 |
| #define REC_QR_DEFINE() v_t x0, y0, t0 |
| #define REC_QR_X x0 |
| #define REC_QR_Y y0 |
| #define REC_QR_T t0 |
| |
| |
| #define SYN_PQR_DEFINE() v_t d0, x0 |
| #define SYN_PQR_D d0 |
| #define SYN_PQR_X x0 |
| |
| #define REC_PQR_STRIDE 1 |
| #define REC_PQR_DEFINE() v_t x0, y0, z0, xs0, ys0 |
| #define REC_PQR_X x0 |
| #define REC_PQR_Y y0 |
| #define REC_PQR_Z z0 |
| #define REC_PQR_XS xs0 |
| #define REC_PQR_YS ys0 |
| |
| #include "vdev_raidz_math_impl.h" |
| |
| DEFINE_GEN_METHODS(scalar); |
| DEFINE_REC_METHODS(scalar); |
| |
| boolean_t |
| raidz_will_scalar_work(void) |
| { |
| return (B_TRUE); /* always */ |
| } |
| |
| const raidz_impl_ops_t vdev_raidz_scalar_impl = { |
| .init = raidz_init_scalar, |
| .fini = NULL, |
| .gen = RAIDZ_GEN_METHODS(scalar), |
| .rec = RAIDZ_REC_METHODS(scalar), |
| .is_supported = &raidz_will_scalar_work, |
| .name = "scalar" |
| }; |
| |
| /* Powers of 2 in the RAID-Z Galois field. */ |
| const uint8_t vdev_raidz_pow2[256] __attribute__((aligned(256))) = { |
| 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, |
| 0x1d, 0x3a, 0x74, 0xe8, 0xcd, 0x87, 0x13, 0x26, |
| 0x4c, 0x98, 0x2d, 0x5a, 0xb4, 0x75, 0xea, 0xc9, |
| 0x8f, 0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, |
| 0x9d, 0x27, 0x4e, 0x9c, 0x25, 0x4a, 0x94, 0x35, |
| 0x6a, 0xd4, 0xb5, 0x77, 0xee, 0xc1, 0x9f, 0x23, |
| 0x46, 0x8c, 0x05, 0x0a, 0x14, 0x28, 0x50, 0xa0, |
| 0x5d, 0xba, 0x69, 0xd2, 0xb9, 0x6f, 0xde, 0xa1, |
| 0x5f, 0xbe, 0x61, 0xc2, 0x99, 0x2f, 0x5e, 0xbc, |
| 0x65, 0xca, 0x89, 0x0f, 0x1e, 0x3c, 0x78, 0xf0, |
| 0xfd, 0xe7, 0xd3, 0xbb, 0x6b, 0xd6, 0xb1, 0x7f, |
| 0xfe, 0xe1, 0xdf, 0xa3, 0x5b, 0xb6, 0x71, 0xe2, |
| 0xd9, 0xaf, 0x43, 0x86, 0x11, 0x22, 0x44, 0x88, |
| 0x0d, 0x1a, 0x34, 0x68, 0xd0, 0xbd, 0x67, 0xce, |
| 0x81, 0x1f, 0x3e, 0x7c, 0xf8, 0xed, 0xc7, 0x93, |
| 0x3b, 0x76, 0xec, 0xc5, 0x97, 0x33, 0x66, 0xcc, |
| 0x85, 0x17, 0x2e, 0x5c, 0xb8, 0x6d, 0xda, 0xa9, |
| 0x4f, 0x9e, 0x21, 0x42, 0x84, 0x15, 0x2a, 0x54, |
| 0xa8, 0x4d, 0x9a, 0x29, 0x52, 0xa4, 0x55, 0xaa, |
| 0x49, 0x92, 0x39, 0x72, 0xe4, 0xd5, 0xb7, 0x73, |
| 0xe6, 0xd1, 0xbf, 0x63, 0xc6, 0x91, 0x3f, 0x7e, |
| 0xfc, 0xe5, 0xd7, 0xb3, 0x7b, 0xf6, 0xf1, 0xff, |
| 0xe3, 0xdb, 0xab, 0x4b, 0x96, 0x31, 0x62, 0xc4, |
| 0x95, 0x37, 0x6e, 0xdc, 0xa5, 0x57, 0xae, 0x41, |
| 0x82, 0x19, 0x32, 0x64, 0xc8, 0x8d, 0x07, 0x0e, |
| 0x1c, 0x38, 0x70, 0xe0, 0xdd, 0xa7, 0x53, 0xa6, |
| 0x51, 0xa2, 0x59, 0xb2, 0x79, 0xf2, 0xf9, 0xef, |
| 0xc3, 0x9b, 0x2b, 0x56, 0xac, 0x45, 0x8a, 0x09, |
| 0x12, 0x24, 0x48, 0x90, 0x3d, 0x7a, 0xf4, 0xf5, |
| 0xf7, 0xf3, 0xfb, 0xeb, 0xcb, 0x8b, 0x0b, 0x16, |
| 0x2c, 0x58, 0xb0, 0x7d, 0xfa, 0xe9, 0xcf, 0x83, |
| 0x1b, 0x36, 0x6c, 0xd8, 0xad, 0x47, 0x8e, 0x01 |
| }; |
| |
| /* Logs of 2 in the RAID-Z Galois field. */ |
| const uint8_t vdev_raidz_log2[256] __attribute__((aligned(256))) = { |
| 0x00, 0x00, 0x01, 0x19, 0x02, 0x32, 0x1a, 0xc6, |
| 0x03, 0xdf, 0x33, 0xee, 0x1b, 0x68, 0xc7, 0x4b, |
| 0x04, 0x64, 0xe0, 0x0e, 0x34, 0x8d, 0xef, 0x81, |
| 0x1c, 0xc1, 0x69, 0xf8, 0xc8, 0x08, 0x4c, 0x71, |
| 0x05, 0x8a, 0x65, 0x2f, 0xe1, 0x24, 0x0f, 0x21, |
| 0x35, 0x93, 0x8e, 0xda, 0xf0, 0x12, 0x82, 0x45, |
| 0x1d, 0xb5, 0xc2, 0x7d, 0x6a, 0x27, 0xf9, 0xb9, |
| 0xc9, 0x9a, 0x09, 0x78, 0x4d, 0xe4, 0x72, 0xa6, |
| 0x06, 0xbf, 0x8b, 0x62, 0x66, 0xdd, 0x30, 0xfd, |
| 0xe2, 0x98, 0x25, 0xb3, 0x10, 0x91, 0x22, 0x88, |
| 0x36, 0xd0, 0x94, 0xce, 0x8f, 0x96, 0xdb, 0xbd, |
| 0xf1, 0xd2, 0x13, 0x5c, 0x83, 0x38, 0x46, 0x40, |
| 0x1e, 0x42, 0xb6, 0xa3, 0xc3, 0x48, 0x7e, 0x6e, |
| 0x6b, 0x3a, 0x28, 0x54, 0xfa, 0x85, 0xba, 0x3d, |
| 0xca, 0x5e, 0x9b, 0x9f, 0x0a, 0x15, 0x79, 0x2b, |
| 0x4e, 0xd4, 0xe5, 0xac, 0x73, 0xf3, 0xa7, 0x57, |
| 0x07, 0x70, 0xc0, 0xf7, 0x8c, 0x80, 0x63, 0x0d, |
| 0x67, 0x4a, 0xde, 0xed, 0x31, 0xc5, 0xfe, 0x18, |
| 0xe3, 0xa5, 0x99, 0x77, 0x26, 0xb8, 0xb4, 0x7c, |
| 0x11, 0x44, 0x92, 0xd9, 0x23, 0x20, 0x89, 0x2e, |
| 0x37, 0x3f, 0xd1, 0x5b, 0x95, 0xbc, 0xcf, 0xcd, |
| 0x90, 0x87, 0x97, 0xb2, 0xdc, 0xfc, 0xbe, 0x61, |
| 0xf2, 0x56, 0xd3, 0xab, 0x14, 0x2a, 0x5d, 0x9e, |
| 0x84, 0x3c, 0x39, 0x53, 0x47, 0x6d, 0x41, 0xa2, |
| 0x1f, 0x2d, 0x43, 0xd8, 0xb7, 0x7b, 0xa4, 0x76, |
| 0xc4, 0x17, 0x49, 0xec, 0x7f, 0x0c, 0x6f, 0xf6, |
| 0x6c, 0xa1, 0x3b, 0x52, 0x29, 0x9d, 0x55, 0xaa, |
| 0xfb, 0x60, 0x86, 0xb1, 0xbb, 0xcc, 0x3e, 0x5a, |
| 0xcb, 0x59, 0x5f, 0xb0, 0x9c, 0xa9, 0xa0, 0x51, |
| 0x0b, 0xf5, 0x16, 0xeb, 0x7a, 0x75, 0x2c, 0xd7, |
| 0x4f, 0xae, 0xd5, 0xe9, 0xe6, 0xe7, 0xad, 0xe8, |
| 0x74, 0xd6, 0xf4, 0xea, 0xa8, 0x50, 0x58, 0xaf, |
| }; |