^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* -*- linux-c -*- ------------------------------------------------------- *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This program is free software; you can redistribute it and/or modify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * it under the terms of the GNU General Public License as published by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Boston MA 02111-1307, USA; either version 2 of the License, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * (at your option) any later version; incorporated herein by reference.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * ----------------------------------------------------------------------- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * raid6altivec$#.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * $#-way unrolled portable integer math RAID-6 instruction set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * This file is postprocessed using unroll.awk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * <benh> hpa: in process,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * you can just "steal" the vec unit with enable_kernel_altivec() (but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * bracked this with preempt_disable/enable or in a lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/raid/pq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #ifdef CONFIG_ALTIVEC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <altivec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #ifdef __KERNEL__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) # include <asm/cputable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) # include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #endif /* __KERNEL__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * This is the C data type to use. We use a vector of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * signed char so vec_cmpgt() will generate the right
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * instruction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) typedef vector signed char unative_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define NBYTES(x) ((vector signed char) {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x})
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define NSIZE sizeof(unative_t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * The SHLBYTE() operation shifts each byte left by 1, *not*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * rolling over into the next byte
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static inline __attribute_const__ unative_t SHLBYTE(unative_t v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return vec_add(v,v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * The MASK() operation returns 0xFF in any byte for which the high
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * bit is 1, 0x00 for any byte for which the high bit is 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static inline __attribute_const__ unative_t MASK(unative_t v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) unative_t zv = NBYTES(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /* vec_cmpgt returns a vector bool char; thus the need for the cast */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return (unative_t)vec_cmpgt(zv, v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /* This is noinline to make damned sure that gcc doesn't move any of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) Altivec code around the enable/disable code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static void noinline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) raid6_altivec$#_gen_syndrome_real(int disks, size_t bytes, void **ptrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) u8 **dptr = (u8 **)ptrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) u8 *p, *q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int d, z, z0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) unative_t wd$$, wq$$, wp$$, w1$$, w2$$;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) unative_t x1d = NBYTES(0x1d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) z0 = disks - 3; /* Highest data disk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) p = dptr[z0+1]; /* XOR parity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) q = dptr[z0+2]; /* RS syndrome */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) for ( d = 0 ; d < bytes ; d += NSIZE*$# ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) wq$$ = wp$$ = *(unative_t *)&dptr[z0][d+$$*NSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) for ( z = z0-1 ; z >= 0 ; z-- ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) wd$$ = *(unative_t *)&dptr[z][d+$$*NSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) wp$$ = vec_xor(wp$$, wd$$);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) w2$$ = MASK(wq$$);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) w1$$ = SHLBYTE(wq$$);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) w2$$ = vec_and(w2$$, x1d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) w1$$ = vec_xor(w1$$, w2$$);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) wq$$ = vec_xor(w1$$, wd$$);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *(unative_t *)&p[d+NSIZE*$$] = wp$$;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) *(unative_t *)&q[d+NSIZE*$$] = wq$$;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static void raid6_altivec$#_gen_syndrome(int disks, size_t bytes, void **ptrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) enable_kernel_altivec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) raid6_altivec$#_gen_syndrome_real(disks, bytes, ptrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) disable_kernel_altivec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int raid6_have_altivec(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) #if $# == 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) int raid6_have_altivec(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* This assumes either all CPUs have Altivec or none does */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) # ifdef __KERNEL__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return cpu_has_feature(CPU_FTR_ALTIVEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) # else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) # endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) const struct raid6_calls raid6_altivec$# = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) raid6_altivec$#_gen_syndrome,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) NULL, /* XOR not yet implemented */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) raid6_have_altivec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) "altivecx$#",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #endif /* CONFIG_ALTIVEC */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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