1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Intel Corporation
4 */
5
6 #include <linux/raid/pq.h>
7 #include "x86.h"
8
9 static int raid6_has_ssse3(void)
10 {
11 return boot_cpu_has(X86_FEATURE_XMM) &&
12 boot_cpu_has(X86_FEATURE_XMM2) &&
13 boot_cpu_has(X86_FEATURE_SSSE3);
14 }
15
16 static void raid6_2data_recov_ssse3(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 static const u8 __aligned(16) x0f[16] = {
23 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
24 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
25
26 p = (u8 *)ptrs[disks-2];
27 q = (u8 *)ptrs[disks-1];
28
29 /* Compute syndrome with zero for the missing data pages
30 Use the dead data pages as temporary storage for
31 delta p and delta q */
32 dp = (u8 *)ptrs[faila];
33 ptrs[faila] = (void *)raid6_empty_zero_page;
34 ptrs[disks-2] = dp;
35 dq = (u8 *)ptrs[failb];
36 ptrs[failb] = (void *)raid6_empty_zero_page;
37 ptrs[disks-1] = dq;
38
39 raid6_call.gen_syndrome(disks, bytes, ptrs);
40
41 /* Restore pointer table */
42 ptrs[faila] = dp;
43 ptrs[failb] = dq;
44 ptrs[disks-2] = p;
45 ptrs[disks-1] = q;
46
47 /* Now, pick the proper data tables */
48 pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
49 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
50 raid6_gfexp[failb]]];
51
52 kernel_fpu_begin();
53
54 asm volatile("movdqa %0,%%xmm7" : : "m" (x0f[0]));
55
56 #ifdef CONFIG_X86_64
57 asm volatile("movdqa %0,%%xmm6" : : "m" (qmul[0]));
58 asm volatile("movdqa %0,%%xmm14" : : "m" (pbmul[0]));
59 asm volatile("movdqa %0,%%xmm15" : : "m" (pbmul[16]));
60 #endif
61
62 /* Now do it... */
63 while (bytes) {
64 #ifdef CONFIG_X86_64
65 /* xmm6, xmm14, xmm15 */
66
67 asm volatile("movdqa %0,%%xmm1" : : "m" (q[0]));
68 asm volatile("movdqa %0,%%xmm9" : : "m" (q[16]));
69 asm volatile("movdqa %0,%%xmm0" : : "m" (p[0]));
70 asm volatile("movdqa %0,%%xmm8" : : "m" (p[16]));
71 asm volatile("pxor %0,%%xmm1" : : "m" (dq[0]));
72 asm volatile("pxor %0,%%xmm9" : : "m" (dq[16]));
73 asm volatile("pxor %0,%%xmm0" : : "m" (dp[0]));
74 asm volatile("pxor %0,%%xmm8" : : "m" (dp[16]));
75
76 /* xmm0/8 = px */
77
78 asm volatile("movdqa %xmm6,%xmm4");
79 asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
80 asm volatile("movdqa %xmm6,%xmm12");
81 asm volatile("movdqa %xmm5,%xmm13");
82 asm volatile("movdqa %xmm1,%xmm3");
83 asm volatile("movdqa %xmm9,%xmm11");
84 asm volatile("movdqa %xmm0,%xmm2"); /* xmm2/10 = px */
85 asm volatile("movdqa %xmm8,%xmm10");
86 asm volatile("psraw $4,%xmm1");
87 asm volatile("psraw $4,%xmm9");
88 asm volatile("pand %xmm7,%xmm3");
89 asm volatile("pand %xmm7,%xmm11");
90 asm volatile("pand %xmm7,%xmm1");
91 asm volatile("pand %xmm7,%xmm9");
92 asm volatile("pshufb %xmm3,%xmm4");
93 asm volatile("pshufb %xmm11,%xmm12");
94 asm volatile("pshufb %xmm1,%xmm5");
95 asm volatile("pshufb %xmm9,%xmm13");
96 asm volatile("pxor %xmm4,%xmm5");
97 asm volatile("pxor %xmm12,%xmm13");
98
99 /* xmm5/13 = qx */
100
101 asm volatile("movdqa %xmm14,%xmm4");
102 asm volatile("movdqa %xmm15,%xmm1");
103 asm volatile("movdqa %xmm14,%xmm12");
104 asm volatile("movdqa %xmm15,%xmm9");
105 asm volatile("movdqa %xmm2,%xmm3");
106 asm volatile("movdqa %xmm10,%xmm11");
107 asm volatile("psraw $4,%xmm2");
108 asm volatile("psraw $4,%xmm10");
109 asm volatile("pand %xmm7,%xmm3");
110 asm volatile("pand %xmm7,%xmm11");
111 asm volatile("pand %xmm7,%xmm2");
112 asm volatile("pand %xmm7,%xmm10");
113 asm volatile("pshufb %xmm3,%xmm4");
114 asm volatile("pshufb %xmm11,%xmm12");
115 asm volatile("pshufb %xmm2,%xmm1");
116 asm volatile("pshufb %xmm10,%xmm9");
117 asm volatile("pxor %xmm4,%xmm1");
118 asm volatile("pxor %xmm12,%xmm9");
119
120 /* xmm1/9 = pbmul[px] */
121 asm volatile("pxor %xmm5,%xmm1");
122 asm volatile("pxor %xmm13,%xmm9");
123 /* xmm1/9 = db = DQ */
124 asm volatile("movdqa %%xmm1,%0" : "=m" (dq[0]));
125 asm volatile("movdqa %%xmm9,%0" : "=m" (dq[16]));
126
127 asm volatile("pxor %xmm1,%xmm0");
128 asm volatile("pxor %xmm9,%xmm8");
129 asm volatile("movdqa %%xmm0,%0" : "=m" (dp[0]));
130 asm volatile("movdqa %%xmm8,%0" : "=m" (dp[16]));
131
132 bytes -= 32;
133 p += 32;
134 q += 32;
135 dp += 32;
136 dq += 32;
137 #else
138 asm volatile("movdqa %0,%%xmm1" : : "m" (*q));
139 asm volatile("movdqa %0,%%xmm0" : : "m" (*p));
140 asm volatile("pxor %0,%%xmm1" : : "m" (*dq));
141 asm volatile("pxor %0,%%xmm0" : : "m" (*dp));
142
143 /* 1 = dq ^ q
144 * 0 = dp ^ p
145 */
146 asm volatile("movdqa %0,%%xmm4" : : "m" (qmul[0]));
147 asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
148
149 asm volatile("movdqa %xmm1,%xmm3");
150 asm volatile("psraw $4,%xmm1");
151 asm volatile("pand %xmm7,%xmm3");
152 asm volatile("pand %xmm7,%xmm1");
153 asm volatile("pshufb %xmm3,%xmm4");
154 asm volatile("pshufb %xmm1,%xmm5");
155 asm volatile("pxor %xmm4,%xmm5");
156
157 asm volatile("movdqa %xmm0,%xmm2"); /* xmm2 = px */
158
159 /* xmm5 = qx */
160
161 asm volatile("movdqa %0,%%xmm4" : : "m" (pbmul[0]));
162 asm volatile("movdqa %0,%%xmm1" : : "m" (pbmul[16]));
163 asm volatile("movdqa %xmm2,%xmm3");
164 asm volatile("psraw $4,%xmm2");
165 asm volatile("pand %xmm7,%xmm3");
166 asm volatile("pand %xmm7,%xmm2");
167 asm volatile("pshufb %xmm3,%xmm4");
168 asm volatile("pshufb %xmm2,%xmm1");
169 asm volatile("pxor %xmm4,%xmm1");
170
171 /* xmm1 = pbmul[px] */
172 asm volatile("pxor %xmm5,%xmm1");
173 /* xmm1 = db = DQ */
174 asm volatile("movdqa %%xmm1,%0" : "=m" (*dq));
175
176 asm volatile("pxor %xmm1,%xmm0");
177 asm volatile("movdqa %%xmm0,%0" : "=m" (*dp));
178
179 bytes -= 16;
180 p += 16;
181 q += 16;
182 dp += 16;
183 dq += 16;
184 #endif
185 }
186
187 kernel_fpu_end();
188 }
189
190
191 static void raid6_datap_recov_ssse3(int disks, size_t bytes, int faila,
192 void **ptrs)
193 {
194 u8 *p, *q, *dq;
195 const u8 *qmul; /* Q multiplier table */
196 static const u8 __aligned(16) x0f[16] = {
197 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
198 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
199
200 p = (u8 *)ptrs[disks-2];
201 q = (u8 *)ptrs[disks-1];
202
203 /* Compute syndrome with zero for the missing data page
204 Use the dead data page as temporary storage for delta q */
205 dq = (u8 *)ptrs[faila];
206 ptrs[faila] = (void *)raid6_empty_zero_page;
207 ptrs[disks-1] = dq;
208
209 raid6_call.gen_syndrome(disks, bytes, ptrs);
210
211 /* Restore pointer table */
212 ptrs[faila] = dq;
213 ptrs[disks-1] = q;
214
215 /* Now, pick the proper data tables */
216 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
217
218 kernel_fpu_begin();
219
220 asm volatile("movdqa %0, %%xmm7" : : "m" (x0f[0]));
221
222 while (bytes) {
223 #ifdef CONFIG_X86_64
224 asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
225 asm volatile("movdqa %0, %%xmm4" : : "m" (dq[16]));
226 asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
227 asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
228
229 /* xmm3 = q[0] ^ dq[0] */
230
231 asm volatile("pxor %0, %%xmm4" : : "m" (q[16]));
232 asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
233
234 /* xmm4 = q[16] ^ dq[16] */
235
236 asm volatile("movdqa %xmm3, %xmm6");
237 asm volatile("movdqa %xmm4, %xmm8");
238
239 /* xmm4 = xmm8 = q[16] ^ dq[16] */
240
241 asm volatile("psraw $4, %xmm3");
242 asm volatile("pand %xmm7, %xmm6");
243 asm volatile("pand %xmm7, %xmm3");
244 asm volatile("pshufb %xmm6, %xmm0");
245 asm volatile("pshufb %xmm3, %xmm1");
246 asm volatile("movdqa %0, %%xmm10" : : "m" (qmul[0]));
247 asm volatile("pxor %xmm0, %xmm1");
248 asm volatile("movdqa %0, %%xmm11" : : "m" (qmul[16]));
249
250 /* xmm1 = qmul[q[0] ^ dq[0]] */
251
252 asm volatile("psraw $4, %xmm4");
253 asm volatile("pand %xmm7, %xmm8");
254 asm volatile("pand %xmm7, %xmm4");
255 asm volatile("pshufb %xmm8, %xmm10");
256 asm volatile("pshufb %xmm4, %xmm11");
257 asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
258 asm volatile("pxor %xmm10, %xmm11");
259 asm volatile("movdqa %0, %%xmm12" : : "m" (p[16]));
260
261 /* xmm11 = qmul[q[16] ^ dq[16]] */
262
263 asm volatile("pxor %xmm1, %xmm2");
264
265 /* xmm2 = p[0] ^ qmul[q[0] ^ dq[0]] */
266
267 asm volatile("pxor %xmm11, %xmm12");
268
269 /* xmm12 = p[16] ^ qmul[q[16] ^ dq[16]] */
270
271 asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
272 asm volatile("movdqa %%xmm11, %0" : "=m" (dq[16]));
273
274 asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
275 asm volatile("movdqa %%xmm12, %0" : "=m" (p[16]));
276
277 bytes -= 32;
278 p += 32;
279 q += 32;
280 dq += 32;
281
282 #else
283 asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
284 asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
285 asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
286 asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
287
288 /* xmm3 = *q ^ *dq */
289
290 asm volatile("movdqa %xmm3, %xmm6");
291 asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
292 asm volatile("psraw $4, %xmm3");
293 asm volatile("pand %xmm7, %xmm6");
294 asm volatile("pand %xmm7, %xmm3");
295 asm volatile("pshufb %xmm6, %xmm0");
296 asm volatile("pshufb %xmm3, %xmm1");
297 asm volatile("pxor %xmm0, %xmm1");
298
299 /* xmm1 = qmul[*q ^ *dq */
300
301 asm volatile("pxor %xmm1, %xmm2");
302
303 /* xmm2 = *p ^ qmul[*q ^ *dq] */
304
305 asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
306 asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
307
308 bytes -= 16;
309 p += 16;
310 q += 16;
311 dq += 16;
312 #endif
313 }
314
315 kernel_fpu_end();
316 }
317
318 const struct raid6_recov_calls raid6_recov_ssse3 = {
319 .data2 = raid6_2data_recov_ssse3,
320 .datap = raid6_datap_recov_ssse3,
321 .valid = raid6_has_ssse3,
322 #ifdef CONFIG_X86_64
323 .name = "ssse3x2",
324 #else
325 .name = "ssse3x1",
326 #endif
327 .priority = 1,
328 };
329
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