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authorJim Kukunas <james.t.kukunas@linux.intel.com>2012-05-21 23:54:18 -0400
committerNeilBrown <neilb@suse.de>2012-05-21 23:54:18 -0400
commit048a8b8c89dc427dd7a58527c8923224b1e66d83 (patch)
treec8e09964537839f3848d0ad0e25ee40e873c3d09 /lib/raid6
parentf674ef7b43881b2ac11f98d6ba2dc5d9dd0dd118 (diff)
lib/raid6: Add SSSE3 optimized recovery functions
Add SSSE3 optimized recovery functions, as well as a system for selecting the most appropriate recovery functions to use. Originally-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'lib/raid6')
-rw-r--r--lib/raid6/Makefile2
-rw-r--r--lib/raid6/algos.c37
-rw-r--r--lib/raid6/mktables.c25
-rw-r--r--lib/raid6/recov.c15
-rw-r--r--lib/raid6/recov_ssse3.c335
5 files changed, 409 insertions, 5 deletions
diff --git a/lib/raid6/Makefile b/lib/raid6/Makefile
index 8a38102770f3..de06dfe165b8 100644
--- a/lib/raid6/Makefile
+++ b/lib/raid6/Makefile
@@ -1,6 +1,6 @@
1obj-$(CONFIG_RAID6_PQ) += raid6_pq.o 1obj-$(CONFIG_RAID6_PQ) += raid6_pq.o
2 2
3raid6_pq-y += algos.o recov.o tables.o int1.o int2.o int4.o \ 3raid6_pq-y += algos.o recov.o recov_ssse3.o tables.o int1.o int2.o int4.o \
4 int8.o int16.o int32.o altivec1.o altivec2.o altivec4.o \ 4 int8.o int16.o int32.o altivec1.o altivec2.o altivec4.o \
5 altivec8.o mmx.o sse1.o sse2.o 5 altivec8.o mmx.o sse1.o sse2.o
6hostprogs-y += mktables 6hostprogs-y += mktables
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c
index f6a0f7899163..5a7f8022be13 100644
--- a/lib/raid6/algos.c
+++ b/lib/raid6/algos.c
@@ -64,6 +64,20 @@ const struct raid6_calls * const raid6_algos[] = {
64 NULL 64 NULL
65}; 65};
66 66
67void (*raid6_2data_recov)(int, size_t, int, int, void **);
68EXPORT_SYMBOL_GPL(raid6_2data_recov);
69
70void (*raid6_datap_recov)(int, size_t, int, void **);
71EXPORT_SYMBOL_GPL(raid6_datap_recov);
72
73const struct raid6_recov_calls *const raid6_recov_algos[] = {
74#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
75 &raid6_recov_ssse3,
76#endif
77 &raid6_recov_intx1,
78 NULL
79};
80
67#ifdef __KERNEL__ 81#ifdef __KERNEL__
68#define RAID6_TIME_JIFFIES_LG2 4 82#define RAID6_TIME_JIFFIES_LG2 4
69#else 83#else
@@ -72,6 +86,26 @@ const struct raid6_calls * const raid6_algos[] = {
72#define time_before(x, y) ((x) < (y)) 86#define time_before(x, y) ((x) < (y))
73#endif 87#endif
74 88
89static inline void raid6_choose_recov(void)
90{
91 const struct raid6_recov_calls *const *algo;
92 const struct raid6_recov_calls *best;
93
94 for (best = NULL, algo = raid6_recov_algos; *algo; algo++)
95 if (!best || (*algo)->priority > best->priority)
96 if (!(*algo)->valid || (*algo)->valid())
97 best = *algo;
98
99 if (best) {
100 raid6_2data_recov = best->data2;
101 raid6_datap_recov = best->datap;
102
103 printk("raid6: using %s recovery algorithm\n", best->name);
104 } else
105 printk("raid6: Yikes! No recovery algorithm found!\n");
106}
107
108
75/* Try to pick the best algorithm */ 109/* Try to pick the best algorithm */
76/* This code uses the gfmul table as convenient data set to abuse */ 110/* This code uses the gfmul table as convenient data set to abuse */
77 111
@@ -141,6 +175,9 @@ int __init raid6_select_algo(void)
141 175
142 free_pages((unsigned long)syndromes, 1); 176 free_pages((unsigned long)syndromes, 1);
143 177
178 /* select raid recover functions */
179 raid6_choose_recov();
180
144 return best ? 0 : -EINVAL; 181 return best ? 0 : -EINVAL;
145} 182}
146 183
diff --git a/lib/raid6/mktables.c b/lib/raid6/mktables.c
index 8a3780902cec..39787db588b0 100644
--- a/lib/raid6/mktables.c
+++ b/lib/raid6/mktables.c
@@ -81,6 +81,31 @@ int main(int argc, char *argv[])
81 printf("EXPORT_SYMBOL(raid6_gfmul);\n"); 81 printf("EXPORT_SYMBOL(raid6_gfmul);\n");
82 printf("#endif\n"); 82 printf("#endif\n");
83 83
84 /* Compute vector multiplication table */
85 printf("\nconst u8 __attribute__((aligned(256)))\n"
86 "raid6_vgfmul[256][32] =\n"
87 "{\n");
88 for (i = 0; i < 256; i++) {
89 printf("\t{\n");
90 for (j = 0; j < 16; j += 8) {
91 printf("\t\t");
92 for (k = 0; k < 8; k++)
93 printf("0x%02x,%c", gfmul(i, j + k),
94 (k == 7) ? '\n' : ' ');
95 }
96 for (j = 0; j < 16; j += 8) {
97 printf("\t\t");
98 for (k = 0; k < 8; k++)
99 printf("0x%02x,%c", gfmul(i, (j + k) << 4),
100 (k == 7) ? '\n' : ' ');
101 }
102 printf("\t},\n");
103 }
104 printf("};\n");
105 printf("#ifdef __KERNEL__\n");
106 printf("EXPORT_SYMBOL(raid6_vgfmul);\n");
107 printf("#endif\n");
108
84 /* Compute power-of-2 table (exponent) */ 109 /* Compute power-of-2 table (exponent) */
85 v = 1; 110 v = 1;
86 printf("\nconst u8 __attribute__((aligned(256)))\n" 111 printf("\nconst u8 __attribute__((aligned(256)))\n"
diff --git a/lib/raid6/recov.c b/lib/raid6/recov.c
index fe275d7b6b36..1805a5cc5daa 100644
--- a/lib/raid6/recov.c
+++ b/lib/raid6/recov.c
@@ -22,7 +22,7 @@
22#include <linux/raid/pq.h> 22#include <linux/raid/pq.h>
23 23
24/* Recover two failed data blocks. */ 24/* Recover two failed data blocks. */
25void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, 25void raid6_2data_recov_intx1(int disks, size_t bytes, int faila, int failb,
26 void **ptrs) 26 void **ptrs)
27{ 27{
28 u8 *p, *q, *dp, *dq; 28 u8 *p, *q, *dp, *dq;
@@ -64,10 +64,9 @@ void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
64 p++; q++; 64 p++; q++;
65 } 65 }
66} 66}
67EXPORT_SYMBOL_GPL(raid6_2data_recov);
68 67
69/* Recover failure of one data block plus the P block */ 68/* Recover failure of one data block plus the P block */
70void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs) 69void raid6_datap_recov_intx1(int disks, size_t bytes, int faila, void **ptrs)
71{ 70{
72 u8 *p, *q, *dq; 71 u8 *p, *q, *dq;
73 const u8 *qmul; /* Q multiplier table */ 72 const u8 *qmul; /* Q multiplier table */
@@ -96,7 +95,15 @@ void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs)
96 q++; dq++; 95 q++; dq++;
97 } 96 }
98} 97}
99EXPORT_SYMBOL_GPL(raid6_datap_recov); 98
99
100const struct raid6_recov_calls raid6_recov_intx1 = {
101 .data2 = raid6_2data_recov_intx1,
102 .datap = raid6_datap_recov_intx1,
103 .valid = NULL,
104 .name = "intx1",
105 .priority = 0,
106};
100 107
101#ifndef __KERNEL__ 108#ifndef __KERNEL__
102/* Testing only */ 109/* Testing only */
diff --git a/lib/raid6/recov_ssse3.c b/lib/raid6/recov_ssse3.c
new file mode 100644
index 000000000000..37ae61930559
--- /dev/null
+++ b/lib/raid6/recov_ssse3.c
@@ -0,0 +1,335 @@
1/*
2 * Copyright (C) 2012 Intel Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; version 2
7 * of the License.
8 */
9
10#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
11
12#include <linux/raid/pq.h>
13#include "x86.h"
14
15static int raid6_has_ssse3(void)
16{
17 return boot_cpu_has(X86_FEATURE_XMM) &&
18 boot_cpu_has(X86_FEATURE_XMM2) &&
19 boot_cpu_has(X86_FEATURE_SSSE3);
20}
21
22void raid6_2data_recov_ssse3(int disks, size_t bytes, int faila, int failb,
23 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 static const u8 __aligned(16) x0f[16] = {
29 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
30 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
31
32 p = (u8 *)ptrs[disks-2];
33 q = (u8 *)ptrs[disks-1];
34
35 /* Compute syndrome with zero for the missing data pages
36 Use the dead data pages as temporary storage for
37 delta p and delta q */
38 dp = (u8 *)ptrs[faila];
39 ptrs[faila] = (void *)raid6_empty_zero_page;
40 ptrs[disks-2] = dp;
41 dq = (u8 *)ptrs[failb];
42 ptrs[failb] = (void *)raid6_empty_zero_page;
43 ptrs[disks-1] = dq;
44
45 raid6_call.gen_syndrome(disks, bytes, ptrs);
46
47 /* Restore pointer table */
48 ptrs[faila] = dp;
49 ptrs[failb] = dq;
50 ptrs[disks-2] = p;
51 ptrs[disks-1] = q;
52
53 /* Now, pick the proper data tables */
54 pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
55 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
56 raid6_gfexp[failb]]];
57
58 kernel_fpu_begin();
59
60 asm volatile("movdqa %0,%%xmm7" : : "m" (x0f[0]));
61
62#ifdef CONFIG_X86_64
63 asm volatile("movdqa %0,%%xmm6" : : "m" (qmul[0]));
64 asm volatile("movdqa %0,%%xmm14" : : "m" (pbmul[0]));
65 asm volatile("movdqa %0,%%xmm15" : : "m" (pbmul[16]));
66#endif
67
68 /* Now do it... */
69 while (bytes) {
70#ifdef CONFIG_X86_64
71 /* xmm6, xmm14, xmm15 */
72
73 asm volatile("movdqa %0,%%xmm1" : : "m" (q[0]));
74 asm volatile("movdqa %0,%%xmm9" : : "m" (q[16]));
75 asm volatile("movdqa %0,%%xmm0" : : "m" (p[0]));
76 asm volatile("movdqa %0,%%xmm8" : : "m" (p[16]));
77 asm volatile("pxor %0,%%xmm1" : : "m" (dq[0]));
78 asm volatile("pxor %0,%%xmm9" : : "m" (dq[16]));
79 asm volatile("pxor %0,%%xmm0" : : "m" (dp[0]));
80 asm volatile("pxor %0,%%xmm8" : : "m" (dp[16]));
81
82 /* xmm0/8 = px */
83
84 asm volatile("movdqa %xmm6,%xmm4");
85 asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
86 asm volatile("movdqa %xmm6,%xmm12");
87 asm volatile("movdqa %xmm5,%xmm13");
88 asm volatile("movdqa %xmm1,%xmm3");
89 asm volatile("movdqa %xmm9,%xmm11");
90 asm volatile("movdqa %xmm0,%xmm2"); /* xmm2/10 = px */
91 asm volatile("movdqa %xmm8,%xmm10");
92 asm volatile("psraw $4,%xmm1");
93 asm volatile("psraw $4,%xmm9");
94 asm volatile("pand %xmm7,%xmm3");
95 asm volatile("pand %xmm7,%xmm11");
96 asm volatile("pand %xmm7,%xmm1");
97 asm volatile("pand %xmm7,%xmm9");
98 asm volatile("pshufb %xmm3,%xmm4");
99 asm volatile("pshufb %xmm11,%xmm12");
100 asm volatile("pshufb %xmm1,%xmm5");
101 asm volatile("pshufb %xmm9,%xmm13");
102 asm volatile("pxor %xmm4,%xmm5");
103 asm volatile("pxor %xmm12,%xmm13");
104
105 /* xmm5/13 = qx */
106
107 asm volatile("movdqa %xmm14,%xmm4");
108 asm volatile("movdqa %xmm15,%xmm1");
109 asm volatile("movdqa %xmm14,%xmm12");
110 asm volatile("movdqa %xmm15,%xmm9");
111 asm volatile("movdqa %xmm2,%xmm3");
112 asm volatile("movdqa %xmm10,%xmm11");
113 asm volatile("psraw $4,%xmm2");
114 asm volatile("psraw $4,%xmm10");
115 asm volatile("pand %xmm7,%xmm3");
116 asm volatile("pand %xmm7,%xmm11");
117 asm volatile("pand %xmm7,%xmm2");
118 asm volatile("pand %xmm7,%xmm10");
119 asm volatile("pshufb %xmm3,%xmm4");
120 asm volatile("pshufb %xmm11,%xmm12");
121 asm volatile("pshufb %xmm2,%xmm1");
122 asm volatile("pshufb %xmm10,%xmm9");
123 asm volatile("pxor %xmm4,%xmm1");
124 asm volatile("pxor %xmm12,%xmm9");
125
126 /* xmm1/9 = pbmul[px] */
127 asm volatile("pxor %xmm5,%xmm1");
128 asm volatile("pxor %xmm13,%xmm9");
129 /* xmm1/9 = db = DQ */
130 asm volatile("movdqa %%xmm1,%0" : "=m" (dq[0]));
131 asm volatile("movdqa %%xmm9,%0" : "=m" (dq[16]));
132
133 asm volatile("pxor %xmm1,%xmm0");
134 asm volatile("pxor %xmm9,%xmm8");
135 asm volatile("movdqa %%xmm0,%0" : "=m" (dp[0]));
136 asm volatile("movdqa %%xmm8,%0" : "=m" (dp[16]));
137
138 bytes -= 32;
139 p += 32;
140 q += 32;
141 dp += 32;
142 dq += 32;
143#else
144 asm volatile("movdqa %0,%%xmm1" : : "m" (*q));
145 asm volatile("movdqa %0,%%xmm0" : : "m" (*p));
146 asm volatile("pxor %0,%%xmm1" : : "m" (*dq));
147 asm volatile("pxor %0,%%xmm0" : : "m" (*dp));
148
149 /* 1 = dq ^ q
150 * 0 = dp ^ p
151 */
152 asm volatile("movdqa %0,%%xmm4" : : "m" (qmul[0]));
153 asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
154
155 asm volatile("movdqa %xmm1,%xmm3");
156 asm volatile("psraw $4,%xmm1");
157 asm volatile("pand %xmm7,%xmm3");
158 asm volatile("pand %xmm7,%xmm1");
159 asm volatile("pshufb %xmm3,%xmm4");
160 asm volatile("pshufb %xmm1,%xmm5");
161 asm volatile("pxor %xmm4,%xmm5");
162
163 asm volatile("movdqa %xmm0,%xmm2"); /* xmm2 = px */
164
165 /* xmm5 = qx */
166
167 asm volatile("movdqa %0,%%xmm4" : : "m" (pbmul[0]));
168 asm volatile("movdqa %0,%%xmm1" : : "m" (pbmul[16]));
169 asm volatile("movdqa %xmm2,%xmm3");
170 asm volatile("psraw $4,%xmm2");
171 asm volatile("pand %xmm7,%xmm3");
172 asm volatile("pand %xmm7,%xmm2");
173 asm volatile("pshufb %xmm3,%xmm4");
174 asm volatile("pshufb %xmm2,%xmm1");
175 asm volatile("pxor %xmm4,%xmm1");
176
177 /* xmm1 = pbmul[px] */
178 asm volatile("pxor %xmm5,%xmm1");
179 /* xmm1 = db = DQ */
180 asm volatile("movdqa %%xmm1,%0" : "=m" (*dq));
181
182 asm volatile("pxor %xmm1,%xmm0");
183 asm volatile("movdqa %%xmm0,%0" : "=m" (*dp));
184
185 bytes -= 16;
186 p += 16;
187 q += 16;
188 dp += 16;
189 dq += 16;
190#endif
191 }
192
193 kernel_fpu_end();
194}
195
196
197void raid6_datap_recov_ssse3(int disks, size_t bytes, int faila, void **ptrs)
198{
199 u8 *p, *q, *dq;
200 const u8 *qmul; /* Q multiplier table */
201 static const u8 __aligned(16) x0f[16] = {
202 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
203 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
204
205 p = (u8 *)ptrs[disks-2];
206 q = (u8 *)ptrs[disks-1];
207
208 /* Compute syndrome with zero for the missing data page
209 Use the dead data page as temporary storage for delta q */
210 dq = (u8 *)ptrs[faila];
211 ptrs[faila] = (void *)raid6_empty_zero_page;
212 ptrs[disks-1] = dq;
213
214 raid6_call.gen_syndrome(disks, bytes, ptrs);
215
216 /* Restore pointer table */
217 ptrs[faila] = dq;
218 ptrs[disks-1] = q;
219
220 /* Now, pick the proper data tables */
221 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
222
223 kernel_fpu_begin();
224
225 asm volatile("movdqa %0, %%xmm7" : : "m" (x0f[0]));
226
227 while (bytes) {
228#ifdef CONFIG_X86_64
229 asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
230 asm volatile("movdqa %0, %%xmm4" : : "m" (dq[16]));
231 asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
232 asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
233
234 /* xmm3 = q[0] ^ dq[0] */
235
236 asm volatile("pxor %0, %%xmm4" : : "m" (q[16]));
237 asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
238
239 /* xmm4 = q[16] ^ dq[16] */
240
241 asm volatile("movdqa %xmm3, %xmm6");
242 asm volatile("movdqa %xmm4, %xmm8");
243
244 /* xmm4 = xmm8 = q[16] ^ dq[16] */
245
246 asm volatile("psraw $4, %xmm3");
247 asm volatile("pand %xmm7, %xmm6");
248 asm volatile("pand %xmm7, %xmm3");
249 asm volatile("pshufb %xmm6, %xmm0");
250 asm volatile("pshufb %xmm3, %xmm1");
251 asm volatile("movdqa %0, %%xmm10" : : "m" (qmul[0]));
252 asm volatile("pxor %xmm0, %xmm1");
253 asm volatile("movdqa %0, %%xmm11" : : "m" (qmul[16]));
254
255 /* xmm1 = qmul[q[0] ^ dq[0]] */
256
257 asm volatile("psraw $4, %xmm4");
258 asm volatile("pand %xmm7, %xmm8");
259 asm volatile("pand %xmm7, %xmm4");
260 asm volatile("pshufb %xmm8, %xmm10");
261 asm volatile("pshufb %xmm4, %xmm11");
262 asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
263 asm volatile("pxor %xmm10, %xmm11");
264 asm volatile("movdqa %0, %%xmm12" : : "m" (p[16]));
265
266 /* xmm11 = qmul[q[16] ^ dq[16]] */
267
268 asm volatile("pxor %xmm1, %xmm2");
269
270 /* xmm2 = p[0] ^ qmul[q[0] ^ dq[0]] */
271
272 asm volatile("pxor %xmm11, %xmm12");
273
274 /* xmm12 = p[16] ^ qmul[q[16] ^ dq[16]] */
275
276 asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
277 asm volatile("movdqa %%xmm11, %0" : "=m" (dq[16]));
278
279 asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
280 asm volatile("movdqa %%xmm12, %0" : "=m" (p[16]));
281
282 bytes -= 32;
283 p += 32;
284 q += 32;
285 dq += 32;
286
287#else
288 asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
289 asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
290 asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
291 asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
292
293 /* xmm3 = *q ^ *dq */
294
295 asm volatile("movdqa %xmm3, %xmm6");
296 asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
297 asm volatile("psraw $4, %xmm3");
298 asm volatile("pand %xmm7, %xmm6");
299 asm volatile("pand %xmm7, %xmm3");
300 asm volatile("pshufb %xmm6, %xmm0");
301 asm volatile("pshufb %xmm3, %xmm1");
302 asm volatile("pxor %xmm0, %xmm1");
303
304 /* xmm1 = qmul[*q ^ *dq */
305
306 asm volatile("pxor %xmm1, %xmm2");
307
308 /* xmm2 = *p ^ qmul[*q ^ *dq] */
309
310 asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
311 asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
312
313 bytes -= 16;
314 p += 16;
315 q += 16;
316 dq += 16;
317#endif
318 }
319
320 kernel_fpu_end();
321}
322
323const struct raid6_recov_calls raid6_recov_ssse3 = {
324 .data2 = raid6_2data_recov_ssse3,
325 .datap = raid6_datap_recov_ssse3,
326 .valid = raid6_has_ssse3,
327#ifdef CONFIG_X86_64
328 .name = "ssse3x2",
329#else
330 .name = "ssse3x1",
331#endif
332 .priority = 1,
333};
334
335#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 21:56:45 -0500