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[S390] smp: perform initial cpu reset before starting a cpu 

Performing an initial cpu reset makes sure all registers and tlbs of
the targeted cpu are initialized and flushed.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
hifive-unleashed-5.1
Heiko Carstens 2009-03-26 15:24:53 +01:00 committed by Martin Schwidefsky
parent 6d54c5a3fb
commit d0d3cdf4c2
1 changed files with 15 additions and 6 deletions
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21
arch/s390/kernel/smp.c
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@ -534,18 +534,23 @@ int __cpuinit __cpu_up(unsigned int cpu)
struct _lowcore *cpu_lowcore;
struct stack_frame *sf;
sigp_ccode ccode;
u32 lowcore;
if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED)
return -EIO;
if (smp_alloc_lowcore(cpu))
return -ENOMEM;
do {
ccode = signal_processor(cpu, sigp_initial_cpu_reset);
if (ccode == sigp_busy)
udelay(10);
if (ccode == sigp_not_operational)
goto err_out;
} while (ccode == sigp_busy);
ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]),
cpu, sigp_set_prefix);
if (ccode) {
smp_free_lowcore(cpu);
return -EIO;
}
lowcore = (u32)(unsigned long)lowcore_ptr[cpu];
while (signal_processor_p(lowcore, cpu, sigp_set_prefix) == sigp_busy)
udelay(10);
idle = current_set[cpu];
cpu_lowcore = lowcore_ptr[cpu];
@ -574,6 +579,10 @@ int __cpuinit __cpu_up(unsigned int cpu)
while (!cpu_online(cpu))
cpu_relax();
return 0;
err_out:
smp_free_lowcore(cpu);
return -EIO;
}
static int __init setup_possible_cpus(char *s)