Eric Lee / smarc-fsl-linux-kernel

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  /* -----------------------------------------------------------------------
   *
   *   neon.uc - RAID-6 syndrome calculation using ARM NEON instructions
   *
   *   Copyright (C) 2012 Rob Herring
0e833e697   Ard Biesheuvel   md/raid6: delta s... 
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   *   Copyright (C) 2015 Linaro Ltd. <ard.biesheuvel@linaro.org>
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   *
   *   Based on altivec.uc:
   *     Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
   *
   *   This program is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   *   Boston MA 02111-1307, USA; either version 2 of the License, or
   *   (at your option) any later version; incorporated herein by reference.
   *
   * ----------------------------------------------------------------------- */
  
  /*
   * neon$#.c
   *
   * $#-way unrolled NEON intrinsics math RAID-6 instruction set
   *
   * This file is postprocessed using unroll.awk
   */
  
  #include <arm_neon.h>
  
  typedef uint8x16_t unative_t;
  
  #define NBYTES(x) ((unative_t){x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x})
  #define NSIZE	sizeof(unative_t)
  
  /*
   * The SHLBYTE() operation shifts each byte left by 1, *not*
   * rolling over into the next byte
   */
  static inline unative_t SHLBYTE(unative_t v)
  {
  	return vshlq_n_u8(v, 1);
  }
  
  /*
   * The MASK() operation returns 0xFF in any byte for which the high
   * bit is 1, 0x00 for any byte for which the high bit is 0.
   */
  static inline unative_t MASK(unative_t v)
  {
  	const uint8x16_t temp = NBYTES(0);
  	return (unative_t)vcltq_s8((int8x16_t)v, (int8x16_t)temp);
  }
  
  void raid6_neon$#_gen_syndrome_real(int disks, unsigned long bytes, void **ptrs)
  {
  	uint8_t **dptr = (uint8_t **)ptrs;
  	uint8_t *p, *q;
  	int d, z, z0;
  
  	register unative_t wd$$, wq$$, wp$$, w1$$, w2$$;
  	const unative_t x1d = NBYTES(0x1d);
  
  	z0 = disks - 3;		/* Highest data disk */
  	p = dptr[z0+1];		/* XOR parity */
  	q = dptr[z0+2];		/* RS syndrome */
  
  	for ( d = 0 ; d < bytes ; d += NSIZE*$# ) {
  		wq$$ = wp$$ = vld1q_u8(&dptr[z0][d+$$*NSIZE]);
  		for ( z = z0-1 ; z >= 0 ; z-- ) {
  			wd$$ = vld1q_u8(&dptr[z][d+$$*NSIZE]);
  			wp$$ = veorq_u8(wp$$, wd$$);
  			w2$$ = MASK(wq$$);
  			w1$$ = SHLBYTE(wq$$);
  
  			w2$$ = vandq_u8(w2$$, x1d);
  			w1$$ = veorq_u8(w1$$, w2$$);
  			wq$$ = veorq_u8(w1$$, wd$$);
  		}
  		vst1q_u8(&p[d+NSIZE*$$], wp$$);
  		vst1q_u8(&q[d+NSIZE*$$], wq$$);
  	}
  }
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  void raid6_neon$#_xor_syndrome_real(int disks, int start, int stop,
  				    unsigned long bytes, void **ptrs)
  {
  	uint8_t **dptr = (uint8_t **)ptrs;
  	uint8_t *p, *q;
  	int d, z, z0;
  
  	register unative_t wd$$, wq$$, wp$$, w1$$, w2$$;
  	const unative_t x1d = NBYTES(0x1d);
  
  	z0 = stop;		/* P/Q right side optimization */
  	p = dptr[disks-2];	/* XOR parity */
  	q = dptr[disks-1];	/* RS syndrome */
  
  	for ( d = 0 ; d < bytes ; d += NSIZE*$# ) {
  		wq$$ = vld1q_u8(&dptr[z0][d+$$*NSIZE]);
  		wp$$ = veorq_u8(vld1q_u8(&p[d+$$*NSIZE]), wq$$);
  
  		/* P/Q data pages */
  		for ( z = z0-1 ; z >= start ; z-- ) {
  			wd$$ = vld1q_u8(&dptr[z][d+$$*NSIZE]);
  			wp$$ = veorq_u8(wp$$, wd$$);
  			w2$$ = MASK(wq$$);
  			w1$$ = SHLBYTE(wq$$);
  
  			w2$$ = vandq_u8(w2$$, x1d);
  			w1$$ = veorq_u8(w1$$, w2$$);
  			wq$$ = veorq_u8(w1$$, wd$$);
  		}
  		/* P/Q left side optimization */
  		for ( z = start-1 ; z >= 0 ; z-- ) {
  			w2$$ = MASK(wq$$);
  			w1$$ = SHLBYTE(wq$$);
  
  			w2$$ = vandq_u8(w2$$, x1d);
  			wq$$ = veorq_u8(w1$$, w2$$);
  		}
  		w1$$ = vld1q_u8(&q[d+NSIZE*$$]);
  		wq$$ = veorq_u8(wq$$, w1$$);
  
  		vst1q_u8(&p[d+NSIZE*$$], wp$$);
  		vst1q_u8(&q[d+NSIZE*$$], wq$$);
  	}
  }