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[POWERPC] Only enable cpu hotplug via RTAS if the required firmware support is found

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To support cpu hotplug on pseries we require two RTAS tokens.  The cpu
hotplug machinery should only be wired up if these tokens are found in
the device tree.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2006-12-05 17:52:38 +11:00 committed by Paul Mackerras
parent 413f7c405a
commit 674fa677c0
1 changed files with 11 additions and 6 deletions
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17
arch/powerpc/platforms/pseries/hotplug-cpu.c
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@ -64,6 +64,8 @@ static void pSeries_mach_cpu_die(void)
for(;;);
}
static int qcss_tok; /* query-cpu-stopped-state token */
/* Get state of physical CPU.
* Return codes:
* 0 - The processor is in the RTAS stopped state
@ -74,12 +76,8 @@ static void pSeries_mach_cpu_die(void)
*/
static int query_cpu_stopped(unsigned int pcpu)
{
int cpu_status;
int status, qcss_tok;
int cpu_status, status;
qcss_tok = rtas_token("query-cpu-stopped-state");
if (qcss_tok == RTAS_UNKNOWN_SERVICE)
return -1;
status = rtas_call(qcss_tok, 1, 2, &cpu_status, pcpu);
if (status != 0) {
printk(KERN_ERR
@ -254,9 +252,16 @@ static struct notifier_block pSeries_smp_nb = {
static int __init pseries_cpu_hotplug_init(void)
{
rtas_stop_self_args.token = rtas_token("stop-self");
qcss_tok = rtas_token("query-cpu-stopped-state");
if (rtas_stop_self_args.token == RTAS_UNKNOWN_SERVICE ||
qcss_tok == RTAS_UNKNOWN_SERVICE) {
printk(KERN_INFO "CPU Hotplug not supported by firmware "
"- disabling.\n");
return 0;
}
ppc_md.cpu_die = pSeries_mach_cpu_die;
smp_ops->cpu_disable = pSeries_cpu_disable;
smp_ops->cpu_die = pSeries_cpu_die;