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1eeb4562 JX |
1 | /* |
2 | * Implement fast Fletcher4 with AVX2 instructions. (x86_64) | |
3 | * | |
4 | * Use the 256-bit AVX2 SIMD instructions and registers to compute | |
5 | * Fletcher4 in four incremental 64-bit parallel accumulator streams, | |
6 | * and then combine the streams to form the final four checksum words. | |
7 | * | |
8 | * Copyright (C) 2015 Intel Corporation. | |
9 | * | |
10 | * Authors: | |
11 | * James Guilford <james.guilford@intel.com> | |
12 | * Jinshan Xiong <jinshan.xiong@intel.com> | |
13 | * | |
14 | * This software is available to you under a choice of one of two | |
15 | * licenses. You may choose to be licensed under the terms of the GNU | |
16 | * General Public License (GPL) Version 2, available from the file | |
17 | * COPYING in the main directory of this source tree, or the | |
18 | * OpenIB.org BSD license below: | |
19 | * | |
20 | * Redistribution and use in source and binary forms, with or | |
21 | * without modification, are permitted provided that the following | |
22 | * conditions are met: | |
23 | * | |
24 | * - Redistributions of source code must retain the above | |
25 | * copyright notice, this list of conditions and the following | |
26 | * disclaimer. | |
27 | * | |
28 | * - Redistributions in binary form must reproduce the above | |
29 | * copyright notice, this list of conditions and the following | |
30 | * disclaimer in the documentation and/or other materials | |
31 | * provided with the distribution. | |
32 | * | |
33 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
34 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
35 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
36 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
37 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
38 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
39 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
40 | * SOFTWARE. | |
41 | */ | |
42 | ||
43 | #if defined(HAVE_AVX) && defined(HAVE_AVX2) | |
44 | ||
45 | #include <linux/simd_x86.h> | |
46 | #include <sys/spa_checksum.h> | |
93ce2b4c | 47 | #include <sys/strings.h> |
1eeb4562 JX |
48 | #include <zfs_fletcher.h> |
49 | ||
50 | static void | |
5bf703b8 | 51 | fletcher_4_avx2_init(fletcher_4_ctx_t *ctx) |
1eeb4562 | 52 | { |
5bf703b8 | 53 | bzero(ctx->avx, 4 * sizeof (zfs_fletcher_avx_t)); |
1eeb4562 JX |
54 | } |
55 | ||
56 | static void | |
5bf703b8 | 57 | fletcher_4_avx2_fini(fletcher_4_ctx_t *ctx, zio_cksum_t *zcp) |
1eeb4562 | 58 | { |
1eeb4562 JX |
59 | uint64_t A, B, C, D; |
60 | ||
5bf703b8 GN |
61 | A = ctx->avx[0].v[0] + ctx->avx[0].v[1] + |
62 | ctx->avx[0].v[2] + ctx->avx[0].v[3]; | |
63 | B = 0 - ctx->avx[0].v[1] - 2 * ctx->avx[0].v[2] - 3 * ctx->avx[0].v[3] + | |
64 | 4 * ctx->avx[1].v[0] + 4 * ctx->avx[1].v[1] + 4 * ctx->avx[1].v[2] + | |
65 | 4 * ctx->avx[1].v[3]; | |
66 | ||
67 | C = ctx->avx[0].v[2] + 3 * ctx->avx[0].v[3] - 6 * ctx->avx[1].v[0] - | |
68 | 10 * ctx->avx[1].v[1] - 14 * ctx->avx[1].v[2] - | |
69 | 18 * ctx->avx[1].v[3] + 16 * ctx->avx[2].v[0] + | |
70 | 16 * ctx->avx[2].v[1] + 16 * ctx->avx[2].v[2] + | |
71 | 16 * ctx->avx[2].v[3]; | |
72 | ||
73 | D = 0 - ctx->avx[0].v[3] + 4 * ctx->avx[1].v[0] + | |
74 | 10 * ctx->avx[1].v[1] + 20 * ctx->avx[1].v[2] + | |
75 | 34 * ctx->avx[1].v[3] - 48 * ctx->avx[2].v[0] - | |
76 | 64 * ctx->avx[2].v[1] - 80 * ctx->avx[2].v[2] - | |
77 | 96 * ctx->avx[2].v[3] + 64 * ctx->avx[3].v[0] + | |
78 | 64 * ctx->avx[3].v[1] + 64 * ctx->avx[3].v[2] + | |
79 | 64 * ctx->avx[3].v[3]; | |
1eeb4562 | 80 | |
5bf703b8 GN |
81 | ZIO_SET_CHECKSUM(zcp, A, B, C, D); |
82 | } | |
1eeb4562 | 83 | |
5bf703b8 GN |
84 | #define FLETCHER_4_AVX2_RESTORE_CTX(ctx) \ |
85 | { \ | |
86 | asm volatile("vmovdqu %0, %%ymm0" :: "m" ((ctx)->avx[0])); \ | |
87 | asm volatile("vmovdqu %0, %%ymm1" :: "m" ((ctx)->avx[1])); \ | |
88 | asm volatile("vmovdqu %0, %%ymm2" :: "m" ((ctx)->avx[2])); \ | |
89 | asm volatile("vmovdqu %0, %%ymm3" :: "m" ((ctx)->avx[3])); \ | |
90 | } | |
1eeb4562 | 91 | |
5bf703b8 GN |
92 | #define FLETCHER_4_AVX2_SAVE_CTX(ctx) \ |
93 | { \ | |
94 | asm volatile("vmovdqu %%ymm0, %0" : "=m" ((ctx)->avx[0])); \ | |
95 | asm volatile("vmovdqu %%ymm1, %0" : "=m" ((ctx)->avx[1])); \ | |
96 | asm volatile("vmovdqu %%ymm2, %0" : "=m" ((ctx)->avx[2])); \ | |
97 | asm volatile("vmovdqu %%ymm3, %0" : "=m" ((ctx)->avx[3])); \ | |
1eeb4562 JX |
98 | } |
99 | ||
5bf703b8 | 100 | |
1eeb4562 | 101 | static void |
5bf703b8 | 102 | fletcher_4_avx2_native(fletcher_4_ctx_t *ctx, const void *buf, uint64_t size) |
1eeb4562 JX |
103 | { |
104 | const uint64_t *ip = buf; | |
105 | const uint64_t *ipend = (uint64_t *)((uint8_t *)ip + size); | |
106 | ||
5bf703b8 GN |
107 | kfpu_begin(); |
108 | ||
109 | FLETCHER_4_AVX2_RESTORE_CTX(ctx); | |
110 | ||
1eeb4562 JX |
111 | for (; ip < ipend; ip += 2) { |
112 | asm volatile("vpmovzxdq %0, %%ymm4"::"m" (*ip)); | |
113 | asm volatile("vpaddq %ymm4, %ymm0, %ymm0"); | |
114 | asm volatile("vpaddq %ymm0, %ymm1, %ymm1"); | |
115 | asm volatile("vpaddq %ymm1, %ymm2, %ymm2"); | |
116 | asm volatile("vpaddq %ymm2, %ymm3, %ymm3"); | |
117 | } | |
5bf703b8 GN |
118 | |
119 | FLETCHER_4_AVX2_SAVE_CTX(ctx); | |
120 | asm volatile("vzeroupper"); | |
121 | ||
122 | kfpu_end(); | |
1eeb4562 JX |
123 | } |
124 | ||
125 | static void | |
5bf703b8 | 126 | fletcher_4_avx2_byteswap(fletcher_4_ctx_t *ctx, const void *buf, uint64_t size) |
1eeb4562 | 127 | { |
5bf703b8 | 128 | static const zfs_fletcher_avx_t mask = { |
1eeb4562 JX |
129 | .v = { 0xFFFFFFFF00010203, 0xFFFFFFFF08090A0B, |
130 | 0xFFFFFFFF00010203, 0xFFFFFFFF08090A0B } | |
131 | }; | |
132 | const uint64_t *ip = buf; | |
133 | const uint64_t *ipend = (uint64_t *)((uint8_t *)ip + size); | |
134 | ||
5bf703b8 GN |
135 | kfpu_begin(); |
136 | ||
137 | FLETCHER_4_AVX2_RESTORE_CTX(ctx); | |
138 | ||
139 | asm volatile("vmovdqu %0, %%ymm5" :: "m" (mask)); | |
1eeb4562 JX |
140 | |
141 | for (; ip < ipend; ip += 2) { | |
142 | asm volatile("vpmovzxdq %0, %%ymm4"::"m" (*ip)); | |
143 | asm volatile("vpshufb %ymm5, %ymm4, %ymm4"); | |
144 | ||
145 | asm volatile("vpaddq %ymm4, %ymm0, %ymm0"); | |
146 | asm volatile("vpaddq %ymm0, %ymm1, %ymm1"); | |
147 | asm volatile("vpaddq %ymm1, %ymm2, %ymm2"); | |
148 | asm volatile("vpaddq %ymm2, %ymm3, %ymm3"); | |
149 | } | |
5bf703b8 GN |
150 | |
151 | FLETCHER_4_AVX2_SAVE_CTX(ctx); | |
152 | asm volatile("vzeroupper"); | |
153 | ||
154 | kfpu_end(); | |
1eeb4562 JX |
155 | } |
156 | ||
157 | static boolean_t fletcher_4_avx2_valid(void) | |
158 | { | |
159 | return (zfs_avx_available() && zfs_avx2_available()); | |
160 | } | |
161 | ||
162 | const fletcher_4_ops_t fletcher_4_avx2_ops = { | |
fc897b24 GN |
163 | .init_native = fletcher_4_avx2_init, |
164 | .fini_native = fletcher_4_avx2_fini, | |
165 | .compute_native = fletcher_4_avx2_native, | |
166 | .init_byteswap = fletcher_4_avx2_init, | |
167 | .fini_byteswap = fletcher_4_avx2_fini, | |
1eeb4562 JX |
168 | .compute_byteswap = fletcher_4_avx2_byteswap, |
169 | .valid = fletcher_4_avx2_valid, | |
170 | .name = "avx2" | |
171 | }; | |
172 | ||
173 | #endif /* defined(HAVE_AVX) && defined(HAVE_AVX2) */ |