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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Optimized xor_block operation for RAID4/5
4 *
5 * Copyright IBM Corp. 2016
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 */
8
9#include <linux/types.h>
10#include <linux/export.h>
11#include <linux/raid/xor.h>
12#include <asm/xor.h>
13
14static void xor_xc_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
15{
16 asm volatile(
17 " larl 1,2f\n"
18 " aghi %0,-1\n"
19 " jm 3f\n"
20 " srlg 0,%0,8\n"
21 " ltgr 0,0\n"
22 " jz 1f\n"
23 "0: xc 0(256,%1),0(%2)\n"
24 " la %1,256(%1)\n"
25 " la %2,256(%2)\n"
26 " brctg 0,0b\n"
27 "1: ex %0,0(1)\n"
28 " j 3f\n"
29 "2: xc 0(1,%1),0(%2)\n"
30 "3:\n"
31 : : "d" (bytes), "a" (p1), "a" (p2)
32 : "0", "1", "cc", "memory");
33}
34
35static void xor_xc_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
36 unsigned long *p3)
37{
38 asm volatile(
39 " larl 1,2f\n"
40 " aghi %0,-1\n"
41 " jm 3f\n"
42 " srlg 0,%0,8\n"
43 " ltgr 0,0\n"
44 " jz 1f\n"
45 "0: xc 0(256,%1),0(%2)\n"
46 " xc 0(256,%1),0(%3)\n"
47 " la %1,256(%1)\n"
48 " la %2,256(%2)\n"
49 " la %3,256(%3)\n"
50 " brctg 0,0b\n"
51 "1: ex %0,0(1)\n"
52 " ex %0,6(1)\n"
53 " j 3f\n"
54 "2: xc 0(1,%1),0(%2)\n"
55 " xc 0(1,%1),0(%3)\n"
56 "3:\n"
57 : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3)
58 : : "0", "1", "cc", "memory");
59}
60
61static void xor_xc_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
62 unsigned long *p3, unsigned long *p4)
63{
64 asm volatile(
65 " larl 1,2f\n"
66 " aghi %0,-1\n"
67 " jm 3f\n"
68 " srlg 0,%0,8\n"
69 " ltgr 0,0\n"
70 " jz 1f\n"
71 "0: xc 0(256,%1),0(%2)\n"
72 " xc 0(256,%1),0(%3)\n"
73 " xc 0(256,%1),0(%4)\n"
74 " la %1,256(%1)\n"
75 " la %2,256(%2)\n"
76 " la %3,256(%3)\n"
77 " la %4,256(%4)\n"
78 " brctg 0,0b\n"
79 "1: ex %0,0(1)\n"
80 " ex %0,6(1)\n"
81 " ex %0,12(1)\n"
82 " j 3f\n"
83 "2: xc 0(1,%1),0(%2)\n"
84 " xc 0(1,%1),0(%3)\n"
85 " xc 0(1,%1),0(%4)\n"
86 "3:\n"
87 : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4)
88 : : "0", "1", "cc", "memory");
89}
90
91static void xor_xc_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
92 unsigned long *p3, unsigned long *p4, unsigned long *p5)
93{
94 /* Get around a gcc oddity */
95 register unsigned long *reg7 asm ("7") = p5;
96
97 asm volatile(
98 " larl 1,2f\n"
99 " aghi %0,-1\n"
100 " jm 3f\n"
101 " srlg 0,%0,8\n"
102 " ltgr 0,0\n"
103 " jz 1f\n"
104 "0: xc 0(256,%1),0(%2)\n"
105 " xc 0(256,%1),0(%3)\n"
106 " xc 0(256,%1),0(%4)\n"
107 " xc 0(256,%1),0(%5)\n"
108 " la %1,256(%1)\n"
109 " la %2,256(%2)\n"
110 " la %3,256(%3)\n"
111 " la %4,256(%4)\n"
112 " la %5,256(%5)\n"
113 " brctg 0,0b\n"
114 "1: ex %0,0(1)\n"
115 " ex %0,6(1)\n"
116 " ex %0,12(1)\n"
117 " ex %0,18(1)\n"
118 " j 3f\n"
119 "2: xc 0(1,%1),0(%2)\n"
120 " xc 0(1,%1),0(%3)\n"
121 " xc 0(1,%1),0(%4)\n"
122 " xc 0(1,%1),0(%5)\n"
123 "3:\n"
124 : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4),
125 "+a" (reg7)
126 : : "0", "1", "cc", "memory");
127}
128
129struct xor_block_template xor_block_xc = {
130 .name = "xc",
131 .do_2 = xor_xc_2,
132 .do_3 = xor_xc_3,
133 .do_4 = xor_xc_4,
134 .do_5 = xor_xc_5,
135};
136EXPORT_SYMBOL(xor_block_xc);
1/*
2 * Optimized xor_block operation for RAID4/5
3 *
4 * Copyright IBM Corp. 2016
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
6 */
7
8#include <linux/types.h>
9#include <linux/module.h>
10#include <linux/raid/xor.h>
11
12static void xor_xc_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
13{
14 asm volatile(
15 " larl 1,2f\n"
16 " aghi %0,-1\n"
17 " jm 3f\n"
18 " srlg 0,%0,8\n"
19 " ltgr 0,0\n"
20 " jz 1f\n"
21 "0: xc 0(256,%1),0(%2)\n"
22 " la %1,256(%1)\n"
23 " la %2,256(%2)\n"
24 " brctg 0,0b\n"
25 "1: ex %0,0(1)\n"
26 " j 3f\n"
27 "2: xc 0(1,%1),0(%2)\n"
28 "3:\n"
29 : : "d" (bytes), "a" (p1), "a" (p2)
30 : "0", "1", "cc", "memory");
31}
32
33static void xor_xc_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
34 unsigned long *p3)
35{
36 asm volatile(
37 " larl 1,2f\n"
38 " aghi %0,-1\n"
39 " jm 3f\n"
40 " srlg 0,%0,8\n"
41 " ltgr 0,0\n"
42 " jz 1f\n"
43 "0: xc 0(256,%1),0(%2)\n"
44 " xc 0(256,%1),0(%3)\n"
45 " la %1,256(%1)\n"
46 " la %2,256(%2)\n"
47 " la %3,256(%3)\n"
48 " brctg 0,0b\n"
49 "1: ex %0,0(1)\n"
50 " ex %0,6(1)\n"
51 " j 3f\n"
52 "2: xc 0(1,%1),0(%2)\n"
53 " xc 0(1,%1),0(%3)\n"
54 "3:\n"
55 : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3)
56 : : "0", "1", "cc", "memory");
57}
58
59static void xor_xc_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
60 unsigned long *p3, unsigned long *p4)
61{
62 asm volatile(
63 " larl 1,2f\n"
64 " aghi %0,-1\n"
65 " jm 3f\n"
66 " srlg 0,%0,8\n"
67 " ltgr 0,0\n"
68 " jz 1f\n"
69 "0: xc 0(256,%1),0(%2)\n"
70 " xc 0(256,%1),0(%3)\n"
71 " xc 0(256,%1),0(%4)\n"
72 " la %1,256(%1)\n"
73 " la %2,256(%2)\n"
74 " la %3,256(%3)\n"
75 " la %4,256(%4)\n"
76 " brctg 0,0b\n"
77 "1: ex %0,0(1)\n"
78 " ex %0,6(1)\n"
79 " ex %0,12(1)\n"
80 " j 3f\n"
81 "2: xc 0(1,%1),0(%2)\n"
82 " xc 0(1,%1),0(%3)\n"
83 " xc 0(1,%1),0(%4)\n"
84 "3:\n"
85 : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4)
86 : : "0", "1", "cc", "memory");
87}
88
89static void xor_xc_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
90 unsigned long *p3, unsigned long *p4, unsigned long *p5)
91{
92 /* Get around a gcc oddity */
93 register unsigned long *reg7 asm ("7") = p5;
94
95 asm volatile(
96 " larl 1,2f\n"
97 " aghi %0,-1\n"
98 " jm 3f\n"
99 " srlg 0,%0,8\n"
100 " ltgr 0,0\n"
101 " jz 1f\n"
102 "0: xc 0(256,%1),0(%2)\n"
103 " xc 0(256,%1),0(%3)\n"
104 " xc 0(256,%1),0(%4)\n"
105 " xc 0(256,%1),0(%5)\n"
106 " la %1,256(%1)\n"
107 " la %2,256(%2)\n"
108 " la %3,256(%3)\n"
109 " la %4,256(%4)\n"
110 " la %5,256(%5)\n"
111 " brctg 0,0b\n"
112 "1: ex %0,0(1)\n"
113 " ex %0,6(1)\n"
114 " ex %0,12(1)\n"
115 " ex %0,18(1)\n"
116 " j 3f\n"
117 "2: xc 0(1,%1),0(%2)\n"
118 " xc 0(1,%1),0(%3)\n"
119 " xc 0(1,%1),0(%4)\n"
120 " xc 0(1,%1),0(%5)\n"
121 "3:\n"
122 : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4),
123 "+a" (reg7)
124 : : "0", "1", "cc", "memory");
125}
126
127struct xor_block_template xor_block_xc = {
128 .name = "xc",
129 .do_2 = xor_xc_2,
130 .do_3 = xor_xc_3,
131 .do_4 = xor_xc_4,
132 .do_5 = xor_xc_5,
133};
134EXPORT_SYMBOL(xor_block_xc);