From: Heiko Carstens Date: Wed, 27 Jul 2005 18:45:00 +0000 (-0700) Subject: [PATCH] s390: external call performance X-Git-Tag: v2.6.13-rc4~25^2~83 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99b2d8df1d06f1072a949fc1e01a08b94b084d5f;p=linux-2.6 [PATCH] s390: external call performance The kernel uses the SIGP external call order code to signal other CPUs. When running with dedicated CPUs external calls don't get delivered immediately but within a fixed polling invervall. This can lead to delays where the system appears to do nothing. Replace the SIGP external call order with the SIGP emergency call order since this one gets delivered immediately. Signed-off-by: Martin Schwidefsky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S index fc8bf5e285..928ca65e8b 100644 --- a/arch/s390/kernel/head.S +++ b/arch/s390/kernel/head.S @@ -765,7 +765,7 @@ _stext: basr %r13,0 # get base # check control registers stctl %c0,%c15,0(%r15) - oi 2(%r15),0x20 # enable sigp external interrupts + oi 2(%r15),0x40 # enable sigp emergency signal oi 0(%r15),0x10 # switch on low address protection lctl %c0,%c15,0(%r15) diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index 28c50bdf7d..10bc592c36 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -762,7 +762,7 @@ _stext: basr %r13,0 # get base # check control registers stctg %c0,%c15,0(%r15) - oi 6(%r15),0x20 # enable sigp external interrupts + oi 6(%r15),0x40 # enable sigp emergency signal oi 4(%r15),0x10 # switch on low address proctection lctlg %c0,%c15,0(%r15) diff --git a/arch/s390/kernel/s390_ext.c b/arch/s390/kernel/s390_ext.c index 3bdd38ec71..207bc511a6 100644 --- a/arch/s390/kernel/s390_ext.c +++ b/arch/s390/kernel/s390_ext.c @@ -19,7 +19,6 @@ #include /* - * Simple hash strategy: index = code & 0xff; * ext_int_hash[index] is the start of the list for all external interrupts * that hash to this index. With the current set of external interrupts * (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000 @@ -27,6 +26,11 @@ */ ext_int_info_t *ext_int_hash[256] = { 0, }; +static inline int ext_hash(__u16 code) +{ + return (code + (code >> 9)) & 0xff; +} + int register_external_interrupt(__u16 code, ext_int_handler_t handler) { ext_int_info_t *p; @@ -37,7 +41,7 @@ int register_external_interrupt(__u16 code, ext_int_handler_t handler) return -ENOMEM; p->code = code; p->handler = handler; - index = code & 0xff; + index = ext_hash(code); p->next = ext_int_hash[index]; ext_int_hash[index] = p; return 0; @@ -52,7 +56,7 @@ int register_early_external_interrupt(__u16 code, ext_int_handler_t handler, return -EINVAL; p->code = code; p->handler = handler; - index = code & 0xff; + index = ext_hash(code); p->next = ext_int_hash[index]; ext_int_hash[index] = p; return 0; @@ -63,7 +67,7 @@ int unregister_external_interrupt(__u16 code, ext_int_handler_t handler) ext_int_info_t *p, *q; int index; - index = code & 0xff; + index = ext_hash(code); q = NULL; p = ext_int_hash[index]; while (p != NULL) { @@ -90,7 +94,7 @@ int unregister_early_external_interrupt(__u16 code, ext_int_handler_t handler, if (p == NULL || p->code != code || p->handler != handler) return -EINVAL; - index = code & 0xff; + index = ext_hash(code); q = ext_int_hash[index]; if (p != q) { while (q != NULL) { @@ -120,7 +124,7 @@ void do_extint(struct pt_regs *regs, unsigned short code) */ account_ticks(regs); kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++; - index = code & 0xff; + index = ext_hash(code); for (p = ext_int_hash[index]; p; p = p->next) { if (likely(p->code == code)) { if (likely(p->handler)) diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 642572a8e3..da77f001af 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -375,7 +375,7 @@ static void smp_ext_bitcall(int cpu, ec_bit_sig sig) * Set signaling bit in lowcore of target cpu and kick it */ set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); - while(signal_processor(cpu, sigp_external_call) == sigp_busy) + while(signal_processor(cpu, sigp_emergency_signal) == sigp_busy) udelay(10); } @@ -394,7 +394,7 @@ static void smp_ext_bitcall_others(ec_bit_sig sig) * Set signaling bit in lowcore of target cpu and kick it */ set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); - while (signal_processor(cpu, sigp_external_call) == sigp_busy) + while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) udelay(10); } } @@ -751,9 +751,9 @@ void __init smp_prepare_cpus(unsigned int max_cpus) unsigned int cpu; int i; - /* request the 0x1202 external interrupt */ - if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0) - panic("Couldn't request external interrupt 0x1202"); + /* request the 0x1201 emergency signal external interrupt */ + if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) + panic("Couldn't request external interrupt 0x1201"); smp_check_cpus(max_cpus); memset(lowcore_ptr,0,sizeof(lowcore_ptr)); /*