1/*
2 * Copyright (C) 2012 Intel Corporation
3 * Author: Jim Kukunas <james.t.kukunas@linux.intel.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; version 2
8 * of the License.
9 */
10
11#if CONFIG_AS_AVX2
12
13#include <linux/raid/pq.h>
14#include "x86.h"
15
16static int raid6_has_avx2(void)
17{
18	return boot_cpu_has(X86_FEATURE_AVX2) &&
19		boot_cpu_has(X86_FEATURE_AVX);
20}
21
22static void raid6_2data_recov_avx2(int disks, size_t bytes, int faila,
23		int failb, void **ptrs)
24{
25	u8 *p, *q, *dp, *dq;
26	const u8 *pbmul;	/* P multiplier table for B data */
27	const u8 *qmul;		/* Q multiplier table (for both) */
28	const u8 x0f = 0x0f;
29
30	p = (u8 *)ptrs[disks-2];
31	q = (u8 *)ptrs[disks-1];
32
33	/* Compute syndrome with zero for the missing data pages
34	   Use the dead data pages as temporary storage for
35	   delta p and delta q */
36	dp = (u8 *)ptrs[faila];
37	ptrs[faila] = (void *)raid6_empty_zero_page;
38	ptrs[disks-2] = dp;
39	dq = (u8 *)ptrs[failb];
40	ptrs[failb] = (void *)raid6_empty_zero_page;
41	ptrs[disks-1] = dq;
42
43	raid6_call.gen_syndrome(disks, bytes, ptrs);
44
45	/* Restore pointer table */
46	ptrs[faila]   = dp;
47	ptrs[failb]   = dq;
48	ptrs[disks-2] = p;
49	ptrs[disks-1] = q;
50
51	/* Now, pick the proper data tables */
52	pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
53	qmul  = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
54		raid6_gfexp[failb]]];
55
56	kernel_fpu_begin();
57
58	/* ymm0 = x0f[16] */
59	asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
60
61	while (bytes) {
62#ifdef CONFIG_X86_64
63		asm volatile("vmovdqa %0, %%ymm1" : : "m" (q[0]));
64		asm volatile("vmovdqa %0, %%ymm9" : : "m" (q[32]));
65		asm volatile("vmovdqa %0, %%ymm0" : : "m" (p[0]));
66		asm volatile("vmovdqa %0, %%ymm8" : : "m" (p[32]));
67		asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (dq[0]));
68		asm volatile("vpxor %0, %%ymm9, %%ymm9" : : "m" (dq[32]));
69		asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (dp[0]));
70		asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (dp[32]));
71
72		/*
73		 * 1 = dq[0]  ^ q[0]
74		 * 9 = dq[32] ^ q[32]
75		 * 0 = dp[0]  ^ p[0]
76		 * 8 = dp[32] ^ p[32]
77		 */
78
79		asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
80		asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
81
82		asm volatile("vpsraw $4, %ymm1, %ymm3");
83		asm volatile("vpsraw $4, %ymm9, %ymm12");
84		asm volatile("vpand %ymm7, %ymm1, %ymm1");
85		asm volatile("vpand %ymm7, %ymm9, %ymm9");
86		asm volatile("vpand %ymm7, %ymm3, %ymm3");
87		asm volatile("vpand %ymm7, %ymm12, %ymm12");
88		asm volatile("vpshufb %ymm9, %ymm4, %ymm14");
89		asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
90		asm volatile("vpshufb %ymm12, %ymm5, %ymm15");
91		asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
92		asm volatile("vpxor %ymm14, %ymm15, %ymm15");
93		asm volatile("vpxor %ymm4, %ymm5, %ymm5");
94
95		/*
96		 * 5 = qx[0]
97		 * 15 = qx[32]
98		 */
99
100		asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
101		asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
102		asm volatile("vpsraw $4, %ymm0, %ymm2");
103		asm volatile("vpsraw $4, %ymm8, %ymm6");
104		asm volatile("vpand %ymm7, %ymm0, %ymm3");
105		asm volatile("vpand %ymm7, %ymm8, %ymm14");
106		asm volatile("vpand %ymm7, %ymm2, %ymm2");
107		asm volatile("vpand %ymm7, %ymm6, %ymm6");
108		asm volatile("vpshufb %ymm14, %ymm4, %ymm12");
109		asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
110		asm volatile("vpshufb %ymm6, %ymm1, %ymm13");
111		asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
112		asm volatile("vpxor %ymm4, %ymm1, %ymm1");
113		asm volatile("vpxor %ymm12, %ymm13, %ymm13");
114
115		/*
116		 * 1  = pbmul[px[0]]
117		 * 13 = pbmul[px[32]]
118		 */
119		asm volatile("vpxor %ymm5, %ymm1, %ymm1");
120		asm volatile("vpxor %ymm15, %ymm13, %ymm13");
121
122		/*
123		 * 1 = db = DQ
124		 * 13 = db[32] = DQ[32]
125		 */
126		asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
127		asm volatile("vmovdqa %%ymm13,%0" : "=m" (dq[32]));
128		asm volatile("vpxor %ymm1, %ymm0, %ymm0");
129		asm volatile("vpxor %ymm13, %ymm8, %ymm8");
130
131		asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
132		asm volatile("vmovdqa %%ymm8, %0" : "=m" (dp[32]));
133
134		bytes -= 64;
135		p += 64;
136		q += 64;
137		dp += 64;
138		dq += 64;
139#else
140		asm volatile("vmovdqa %0, %%ymm1" : : "m" (*q));
141		asm volatile("vmovdqa %0, %%ymm0" : : "m" (*p));
142		asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (*dq));
143		asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (*dp));
144
145		/* 1 = dq ^ q;  0 = dp ^ p */
146
147		asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
148		asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
149
150		/*
151		 * 1 = dq ^ q
152		 * 3 = dq ^ p >> 4
153		 */
154		asm volatile("vpsraw $4, %ymm1, %ymm3");
155		asm volatile("vpand %ymm7, %ymm1, %ymm1");
156		asm volatile("vpand %ymm7, %ymm3, %ymm3");
157		asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
158		asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
159		asm volatile("vpxor %ymm4, %ymm5, %ymm5");
160
161		/* 5 = qx */
162
163		asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
164		asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
165
166		asm volatile("vpsraw $4, %ymm0, %ymm2");
167		asm volatile("vpand %ymm7, %ymm0, %ymm3");
168		asm volatile("vpand %ymm7, %ymm2, %ymm2");
169		asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
170		asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
171		asm volatile("vpxor %ymm4, %ymm1, %ymm1");
172
173		/* 1 = pbmul[px] */
174		asm volatile("vpxor %ymm5, %ymm1, %ymm1");
175		/* 1 = db = DQ */
176		asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
177
178		asm volatile("vpxor %ymm1, %ymm0, %ymm0");
179		asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
180
181		bytes -= 32;
182		p += 32;
183		q += 32;
184		dp += 32;
185		dq += 32;
186#endif
187	}
188
189	kernel_fpu_end();
190}
191
192static void raid6_datap_recov_avx2(int disks, size_t bytes, int faila,
193		void **ptrs)
194{
195	u8 *p, *q, *dq;
196	const u8 *qmul;		/* Q multiplier table */
197	const u8 x0f = 0x0f;
198
199	p = (u8 *)ptrs[disks-2];
200	q = (u8 *)ptrs[disks-1];
201
202	/* Compute syndrome with zero for the missing data page
203	   Use the dead data page as temporary storage for delta q */
204	dq = (u8 *)ptrs[faila];
205	ptrs[faila] = (void *)raid6_empty_zero_page;
206	ptrs[disks-1] = dq;
207
208	raid6_call.gen_syndrome(disks, bytes, ptrs);
209
210	/* Restore pointer table */
211	ptrs[faila]   = dq;
212	ptrs[disks-1] = q;
213
214	/* Now, pick the proper data tables */
215	qmul  = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
216
217	kernel_fpu_begin();
218
219	asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
220
221	while (bytes) {
222#ifdef CONFIG_X86_64
223		asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
224		asm volatile("vmovdqa %0, %%ymm8" : : "m" (dq[32]));
225		asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
226		asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (q[32]));
227
228		/*
229		 * 3 = q[0] ^ dq[0]
230		 * 8 = q[32] ^ dq[32]
231		 */
232		asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
233		asm volatile("vmovapd %ymm0, %ymm13");
234		asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
235		asm volatile("vmovapd %ymm1, %ymm14");
236
237		asm volatile("vpsraw $4, %ymm3, %ymm6");
238		asm volatile("vpsraw $4, %ymm8, %ymm12");
239		asm volatile("vpand %ymm7, %ymm3, %ymm3");
240		asm volatile("vpand %ymm7, %ymm8, %ymm8");
241		asm volatile("vpand %ymm7, %ymm6, %ymm6");
242		asm volatile("vpand %ymm7, %ymm12, %ymm12");
243		asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
244		asm volatile("vpshufb %ymm8, %ymm13, %ymm13");
245		asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
246		asm volatile("vpshufb %ymm12, %ymm14, %ymm14");
247		asm volatile("vpxor %ymm0, %ymm1, %ymm1");
248		asm volatile("vpxor %ymm13, %ymm14, %ymm14");
249
250		/*
251		 * 1  = qmul[q[0]  ^ dq[0]]
252		 * 14 = qmul[q[32] ^ dq[32]]
253		 */
254		asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
255		asm volatile("vmovdqa %0, %%ymm12" : : "m" (p[32]));
256		asm volatile("vpxor %ymm1, %ymm2, %ymm2");
257		asm volatile("vpxor %ymm14, %ymm12, %ymm12");
258
259		/*
260		 * 2  = p[0]  ^ qmul[q[0]  ^ dq[0]]
261		 * 12 = p[32] ^ qmul[q[32] ^ dq[32]]
262		 */
263
264		asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
265		asm volatile("vmovdqa %%ymm14, %0" : "=m" (dq[32]));
266		asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
267		asm volatile("vmovdqa %%ymm12,%0" : "=m" (p[32]));
268
269		bytes -= 64;
270		p += 64;
271		q += 64;
272		dq += 64;
273#else
274		asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
275		asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
276
277		/* 3 = q ^ dq */
278
279		asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
280		asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
281
282		asm volatile("vpsraw $4, %ymm3, %ymm6");
283		asm volatile("vpand %ymm7, %ymm3, %ymm3");
284		asm volatile("vpand %ymm7, %ymm6, %ymm6");
285		asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
286		asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
287		asm volatile("vpxor %ymm0, %ymm1, %ymm1");
288
289		/* 1 = qmul[q ^ dq] */
290
291		asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
292		asm volatile("vpxor %ymm1, %ymm2, %ymm2");
293
294		/* 2 = p ^ qmul[q ^ dq] */
295
296		asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
297		asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
298
299		bytes -= 32;
300		p += 32;
301		q += 32;
302		dq += 32;
303#endif
304	}
305
306	kernel_fpu_end();
307}
308
309const struct raid6_recov_calls raid6_recov_avx2 = {
310	.data2 = raid6_2data_recov_avx2,
311	.datap = raid6_datap_recov_avx2,
312	.valid = raid6_has_avx2,
313#ifdef CONFIG_X86_64
314	.name = "avx2x2",
315#else
316	.name = "avx2x1",
317#endif
318	.priority = 2,
319};
320
321#else
322#warning "your version of binutils lacks AVX2 support"
323#endif
324