From d635711daa98be86d4c7fd01499c34f566b54ccb Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Fri, 10 Jun 2016 05:30:17 -0300 Subject: Linux-libre 4.6.2-gnu --- arch/s390/lib/Makefile | 2 +- arch/s390/lib/spinlock.c | 1 + arch/s390/lib/xor.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 136 insertions(+), 1 deletion(-) create mode 100644 arch/s390/lib/xor.c (limited to 'arch/s390/lib') diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile index 0e8fefe5b..1d1af31e8 100644 --- a/arch/s390/lib/Makefile +++ b/arch/s390/lib/Makefile @@ -3,7 +3,7 @@ # lib-y += delay.o string.o uaccess.o find.o -obj-y += mem.o +obj-y += mem.o xor.o lib-$(CONFIG_SMP) += spinlock.o lib-$(CONFIG_KPROBES) += probes.o lib-$(CONFIG_UPROBES) += probes.o diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c index d4549c964..e5f50a7d2 100644 --- a/arch/s390/lib/spinlock.c +++ b/arch/s390/lib/spinlock.c @@ -105,6 +105,7 @@ void arch_spin_lock_wait_flags(arch_spinlock_t *lp, unsigned long flags) if (_raw_compare_and_swap(&lp->lock, 0, cpu)) return; local_irq_restore(flags); + continue; } /* Check if the lock owner is running. */ if (first_diag && cpu_is_preempted(~owner)) { diff --git a/arch/s390/lib/xor.c b/arch/s390/lib/xor.c new file mode 100644 index 000000000..7d94e3ec3 --- /dev/null +++ b/arch/s390/lib/xor.c @@ -0,0 +1,134 @@ +/* + * Optimized xor_block operation for RAID4/5 + * + * Copyright IBM Corp. 2016 + * Author(s): Martin Schwidefsky + */ + +#include +#include +#include + +static void xor_xc_2(unsigned long bytes, unsigned long *p1, unsigned long *p2) +{ + asm volatile( + " larl 1,2f\n" + " aghi %0,-1\n" + " jm 3f\n" + " srlg 0,%0,8\n" + " ltgr 0,0\n" + " jz 1f\n" + "0: xc 0(256,%1),0(%2)\n" + " la %1,256(%1)\n" + " la %2,256(%2)\n" + " brctg 0,0b\n" + "1: ex %0,0(1)\n" + " j 3f\n" + "2: xc 0(1,%1),0(%2)\n" + "3:\n" + : : "d" (bytes), "a" (p1), "a" (p2) + : "0", "1", "cc", "memory"); +} + +static void xor_xc_3(unsigned long bytes, unsigned long *p1, unsigned long *p2, + unsigned long *p3) +{ + asm volatile( + " larl 1,2f\n" + " aghi %0,-1\n" + " jm 3f\n" + " srlg 0,%0,8\n" + " ltgr 0,0\n" + " jz 1f\n" + "0: xc 0(256,%1),0(%2)\n" + " xc 0(256,%1),0(%3)\n" + " la %1,256(%1)\n" + " la %2,256(%2)\n" + " la %3,256(%3)\n" + " brctg 0,0b\n" + "1: ex %0,0(1)\n" + " ex %0,6(1)\n" + " j 3f\n" + "2: xc 0(1,%1),0(%2)\n" + " xc 0(1,%1),0(%3)\n" + "3:\n" + : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3) + : : "0", "1", "cc", "memory"); +} + +static void xor_xc_4(unsigned long bytes, unsigned long *p1, unsigned long *p2, + unsigned long *p3, unsigned long *p4) +{ + asm volatile( + " larl 1,2f\n" + " aghi %0,-1\n" + " jm 3f\n" + " srlg 0,%0,8\n" + " ltgr 0,0\n" + " jz 1f\n" + "0: xc 0(256,%1),0(%2)\n" + " xc 0(256,%1),0(%3)\n" + " xc 0(256,%1),0(%4)\n" + " la %1,256(%1)\n" + " la %2,256(%2)\n" + " la %3,256(%3)\n" + " la %4,256(%4)\n" + " brctg 0,0b\n" + "1: ex %0,0(1)\n" + " ex %0,6(1)\n" + " ex %0,12(1)\n" + " j 3f\n" + "2: xc 0(1,%1),0(%2)\n" + " xc 0(1,%1),0(%3)\n" + " xc 0(1,%1),0(%4)\n" + "3:\n" + : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4) + : : "0", "1", "cc", "memory"); +} + +static void xor_xc_5(unsigned long bytes, unsigned long *p1, unsigned long *p2, + unsigned long *p3, unsigned long *p4, unsigned long *p5) +{ + /* Get around a gcc oddity */ + register unsigned long *reg7 asm ("7") = p5; + + asm volatile( + " larl 1,2f\n" + " aghi %0,-1\n" + " jm 3f\n" + " srlg 0,%0,8\n" + " ltgr 0,0\n" + " jz 1f\n" + "0: xc 0(256,%1),0(%2)\n" + " xc 0(256,%1),0(%3)\n" + " xc 0(256,%1),0(%4)\n" + " xc 0(256,%1),0(%5)\n" + " la %1,256(%1)\n" + " la %2,256(%2)\n" + " la %3,256(%3)\n" + " la %4,256(%4)\n" + " la %5,256(%5)\n" + " brctg 0,0b\n" + "1: ex %0,0(1)\n" + " ex %0,6(1)\n" + " ex %0,12(1)\n" + " ex %0,18(1)\n" + " j 3f\n" + "2: xc 0(1,%1),0(%2)\n" + " xc 0(1,%1),0(%3)\n" + " xc 0(1,%1),0(%4)\n" + " xc 0(1,%1),0(%5)\n" + "3:\n" + : "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4), + "+a" (reg7) + : : "0", "1", "cc", "memory"); +} + +struct xor_block_template xor_block_xc = { + .name = "xc", + .do_2 = xor_xc_2, + .do_3 = xor_xc_3, + .do_4 = xor_xc_4, + .do_5 = xor_xc_5, +}; +EXPORT_SYMBOL(xor_block_xc); -- cgit v1.2.3-54-g00ecf