1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Intel Corporation
4 * Author: Jim Kukunas <james.t.kukunas@linux.intel.com>
5 */
6
7 #include <linux/raid/pq.h>
8 #include "x86.h"
9
raid6_has_avx2(void)10 static int raid6_has_avx2(void)
11 {
12 return boot_cpu_has(X86_FEATURE_AVX2) &&
13 boot_cpu_has(X86_FEATURE_AVX);
14 }
15
raid6_2data_recov_avx2(int disks,size_t bytes,int faila,int failb,void ** ptrs)16 static void raid6_2data_recov_avx2(int disks, size_t bytes, int faila,
17 int failb, void **ptrs)
18 {
19 u8 *p, *q, *dp, *dq;
20 const u8 *pbmul; /* P multiplier table for B data */
21 const u8 *qmul; /* Q multiplier table (for both) */
22 const u8 x0f = 0x0f;
23
24 p = (u8 *)ptrs[disks-2];
25 q = (u8 *)ptrs[disks-1];
26
27 /* Compute syndrome with zero for the missing data pages
28 Use the dead data pages as temporary storage for
29 delta p and delta q */
30 dp = (u8 *)ptrs[faila];
31 ptrs[faila] = (void *)raid6_empty_zero_page;
32 ptrs[disks-2] = dp;
33 dq = (u8 *)ptrs[failb];
34 ptrs[failb] = (void *)raid6_empty_zero_page;
35 ptrs[disks-1] = dq;
36
37 raid6_call.gen_syndrome(disks, bytes, ptrs);
38
39 /* Restore pointer table */
40 ptrs[faila] = dp;
41 ptrs[failb] = dq;
42 ptrs[disks-2] = p;
43 ptrs[disks-1] = q;
44
45 /* Now, pick the proper data tables */
46 pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
47 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
48 raid6_gfexp[failb]]];
49
50 kernel_fpu_begin();
51
52 /* ymm0 = x0f[16] */
53 asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
54
55 while (bytes) {
56 #ifdef CONFIG_X86_64
57 asm volatile("vmovdqa %0, %%ymm1" : : "m" (q[0]));
58 asm volatile("vmovdqa %0, %%ymm9" : : "m" (q[32]));
59 asm volatile("vmovdqa %0, %%ymm0" : : "m" (p[0]));
60 asm volatile("vmovdqa %0, %%ymm8" : : "m" (p[32]));
61 asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (dq[0]));
62 asm volatile("vpxor %0, %%ymm9, %%ymm9" : : "m" (dq[32]));
63 asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (dp[0]));
64 asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (dp[32]));
65
66 /*
67 * 1 = dq[0] ^ q[0]
68 * 9 = dq[32] ^ q[32]
69 * 0 = dp[0] ^ p[0]
70 * 8 = dp[32] ^ p[32]
71 */
72
73 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
74 asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
75
76 asm volatile("vpsraw $4, %ymm1, %ymm3");
77 asm volatile("vpsraw $4, %ymm9, %ymm12");
78 asm volatile("vpand %ymm7, %ymm1, %ymm1");
79 asm volatile("vpand %ymm7, %ymm9, %ymm9");
80 asm volatile("vpand %ymm7, %ymm3, %ymm3");
81 asm volatile("vpand %ymm7, %ymm12, %ymm12");
82 asm volatile("vpshufb %ymm9, %ymm4, %ymm14");
83 asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
84 asm volatile("vpshufb %ymm12, %ymm5, %ymm15");
85 asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
86 asm volatile("vpxor %ymm14, %ymm15, %ymm15");
87 asm volatile("vpxor %ymm4, %ymm5, %ymm5");
88
89 /*
90 * 5 = qx[0]
91 * 15 = qx[32]
92 */
93
94 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
95 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
96 asm volatile("vpsraw $4, %ymm0, %ymm2");
97 asm volatile("vpsraw $4, %ymm8, %ymm6");
98 asm volatile("vpand %ymm7, %ymm0, %ymm3");
99 asm volatile("vpand %ymm7, %ymm8, %ymm14");
100 asm volatile("vpand %ymm7, %ymm2, %ymm2");
101 asm volatile("vpand %ymm7, %ymm6, %ymm6");
102 asm volatile("vpshufb %ymm14, %ymm4, %ymm12");
103 asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
104 asm volatile("vpshufb %ymm6, %ymm1, %ymm13");
105 asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
106 asm volatile("vpxor %ymm4, %ymm1, %ymm1");
107 asm volatile("vpxor %ymm12, %ymm13, %ymm13");
108
109 /*
110 * 1 = pbmul[px[0]]
111 * 13 = pbmul[px[32]]
112 */
113 asm volatile("vpxor %ymm5, %ymm1, %ymm1");
114 asm volatile("vpxor %ymm15, %ymm13, %ymm13");
115
116 /*
117 * 1 = db = DQ
118 * 13 = db[32] = DQ[32]
119 */
120 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
121 asm volatile("vmovdqa %%ymm13,%0" : "=m" (dq[32]));
122 asm volatile("vpxor %ymm1, %ymm0, %ymm0");
123 asm volatile("vpxor %ymm13, %ymm8, %ymm8");
124
125 asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
126 asm volatile("vmovdqa %%ymm8, %0" : "=m" (dp[32]));
127
128 bytes -= 64;
129 p += 64;
130 q += 64;
131 dp += 64;
132 dq += 64;
133 #else
134 asm volatile("vmovdqa %0, %%ymm1" : : "m" (*q));
135 asm volatile("vmovdqa %0, %%ymm0" : : "m" (*p));
136 asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (*dq));
137 asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (*dp));
138
139 /* 1 = dq ^ q; 0 = dp ^ p */
140
141 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
142 asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
143
144 /*
145 * 1 = dq ^ q
146 * 3 = dq ^ p >> 4
147 */
148 asm volatile("vpsraw $4, %ymm1, %ymm3");
149 asm volatile("vpand %ymm7, %ymm1, %ymm1");
150 asm volatile("vpand %ymm7, %ymm3, %ymm3");
151 asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
152 asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
153 asm volatile("vpxor %ymm4, %ymm5, %ymm5");
154
155 /* 5 = qx */
156
157 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
158 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
159
160 asm volatile("vpsraw $4, %ymm0, %ymm2");
161 asm volatile("vpand %ymm7, %ymm0, %ymm3");
162 asm volatile("vpand %ymm7, %ymm2, %ymm2");
163 asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
164 asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
165 asm volatile("vpxor %ymm4, %ymm1, %ymm1");
166
167 /* 1 = pbmul[px] */
168 asm volatile("vpxor %ymm5, %ymm1, %ymm1");
169 /* 1 = db = DQ */
170 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
171
172 asm volatile("vpxor %ymm1, %ymm0, %ymm0");
173 asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
174
175 bytes -= 32;
176 p += 32;
177 q += 32;
178 dp += 32;
179 dq += 32;
180 #endif
181 }
182
183 kernel_fpu_end();
184 }
185
raid6_datap_recov_avx2(int disks,size_t bytes,int faila,void ** ptrs)186 static void raid6_datap_recov_avx2(int disks, size_t bytes, int faila,
187 void **ptrs)
188 {
189 u8 *p, *q, *dq;
190 const u8 *qmul; /* Q multiplier table */
191 const u8 x0f = 0x0f;
192
193 p = (u8 *)ptrs[disks-2];
194 q = (u8 *)ptrs[disks-1];
195
196 /* Compute syndrome with zero for the missing data page
197 Use the dead data page as temporary storage for delta q */
198 dq = (u8 *)ptrs[faila];
199 ptrs[faila] = (void *)raid6_empty_zero_page;
200 ptrs[disks-1] = dq;
201
202 raid6_call.gen_syndrome(disks, bytes, ptrs);
203
204 /* Restore pointer table */
205 ptrs[faila] = dq;
206 ptrs[disks-1] = q;
207
208 /* Now, pick the proper data tables */
209 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
210
211 kernel_fpu_begin();
212
213 asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
214
215 while (bytes) {
216 #ifdef CONFIG_X86_64
217 asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
218 asm volatile("vmovdqa %0, %%ymm8" : : "m" (dq[32]));
219 asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
220 asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (q[32]));
221
222 /*
223 * 3 = q[0] ^ dq[0]
224 * 8 = q[32] ^ dq[32]
225 */
226 asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
227 asm volatile("vmovapd %ymm0, %ymm13");
228 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
229 asm volatile("vmovapd %ymm1, %ymm14");
230
231 asm volatile("vpsraw $4, %ymm3, %ymm6");
232 asm volatile("vpsraw $4, %ymm8, %ymm12");
233 asm volatile("vpand %ymm7, %ymm3, %ymm3");
234 asm volatile("vpand %ymm7, %ymm8, %ymm8");
235 asm volatile("vpand %ymm7, %ymm6, %ymm6");
236 asm volatile("vpand %ymm7, %ymm12, %ymm12");
237 asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
238 asm volatile("vpshufb %ymm8, %ymm13, %ymm13");
239 asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
240 asm volatile("vpshufb %ymm12, %ymm14, %ymm14");
241 asm volatile("vpxor %ymm0, %ymm1, %ymm1");
242 asm volatile("vpxor %ymm13, %ymm14, %ymm14");
243
244 /*
245 * 1 = qmul[q[0] ^ dq[0]]
246 * 14 = qmul[q[32] ^ dq[32]]
247 */
248 asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
249 asm volatile("vmovdqa %0, %%ymm12" : : "m" (p[32]));
250 asm volatile("vpxor %ymm1, %ymm2, %ymm2");
251 asm volatile("vpxor %ymm14, %ymm12, %ymm12");
252
253 /*
254 * 2 = p[0] ^ qmul[q[0] ^ dq[0]]
255 * 12 = p[32] ^ qmul[q[32] ^ dq[32]]
256 */
257
258 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
259 asm volatile("vmovdqa %%ymm14, %0" : "=m" (dq[32]));
260 asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
261 asm volatile("vmovdqa %%ymm12,%0" : "=m" (p[32]));
262
263 bytes -= 64;
264 p += 64;
265 q += 64;
266 dq += 64;
267 #else
268 asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
269 asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
270
271 /* 3 = q ^ dq */
272
273 asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
274 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
275
276 asm volatile("vpsraw $4, %ymm3, %ymm6");
277 asm volatile("vpand %ymm7, %ymm3, %ymm3");
278 asm volatile("vpand %ymm7, %ymm6, %ymm6");
279 asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
280 asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
281 asm volatile("vpxor %ymm0, %ymm1, %ymm1");
282
283 /* 1 = qmul[q ^ dq] */
284
285 asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
286 asm volatile("vpxor %ymm1, %ymm2, %ymm2");
287
288 /* 2 = p ^ qmul[q ^ dq] */
289
290 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
291 asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
292
293 bytes -= 32;
294 p += 32;
295 q += 32;
296 dq += 32;
297 #endif
298 }
299
300 kernel_fpu_end();
301 }
302
303 const struct raid6_recov_calls raid6_recov_avx2 = {
304 .data2 = raid6_2data_recov_avx2,
305 .datap = raid6_datap_recov_avx2,
306 .valid = raid6_has_avx2,
307 #ifdef CONFIG_X86_64
308 .name = "avx2x2",
309 #else
310 .name = "avx2x1",
311 #endif
312 .priority = 2,
313 };
314