1 // SPDX-License-Identifier: GPL-2.0
3  * RAID-6 data recovery in dual failure mode based on the XC instruction.
13 	typedef struct { u8 _[256]; } addrtype;  in xor_block()
16 		"	xc	0(256,%[p1]),0(%[p2])\n"  in xor_block()
25 	u8 *p, *q, *dp, *dq;  in raid6_2data_recov_s390xc()  local
26 	const u8 *pbmul;	/* P multiplier table for B data */  in raid6_2data_recov_s390xc()
30 	p = (u8 *)ptrs[disks-2];  in raid6_2data_recov_s390xc()
31 	q = (u8 *)ptrs[disks-1];  in raid6_2data_recov_s390xc()
35 	   delta p and delta q */  in raid6_2data_recov_s390xc()
38 	ptrs[disks-2] = dp;  in raid6_2data_recov_s390xc()
41 	ptrs[disks-1] = dq;  in raid6_2data_recov_s390xc()
48 	ptrs[disks-2] = p;  in raid6_2data_recov_s390xc()
49 	ptrs[disks-1] = q;  in raid6_2data_recov_s390xc()
52 	pbmul = raid6_gfmul[raid6_gfexi[failb-faila]];  in raid6_2data_recov_s390xc()
57 		xor_block(dp, p);  in raid6_2data_recov_s390xc()
59 		for (i = 0; i < 256; i++)  in raid6_2data_recov_s390xc()
62 		p += 256;  in raid6_2data_recov_s390xc()
63 		q += 256;  in raid6_2data_recov_s390xc()
64 		dp += 256;  in raid6_2data_recov_s390xc()
65 		dq += 256;  in raid6_2data_recov_s390xc()
66 		bytes -= 256;  in raid6_2data_recov_s390xc()
70 /* Recover failure of one data block plus the P block */
74 	u8 *p, *q, *dq;  in raid6_datap_recov_s390xc()  local
78 	p = (u8 *)ptrs[disks-2];  in raid6_datap_recov_s390xc()
79 	q = (u8 *)ptrs[disks-1];  in raid6_datap_recov_s390xc()
85 	ptrs[disks-1] = dq;  in raid6_datap_recov_s390xc()
91 	ptrs[disks-1] = q;  in raid6_datap_recov_s390xc()
99 		for (i = 0; i < 256; i++)  in raid6_datap_recov_s390xc()
101 		xor_block(p, dq);  in raid6_datap_recov_s390xc()
102 		p += 256;  in raid6_datap_recov_s390xc()
103 		q += 256;  in raid6_datap_recov_s390xc()
104 		dq += 256;  in raid6_datap_recov_s390xc()
105 		bytes -= 256;  in raid6_datap_recov_s390xc()