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[POWERPC] check firmware state before suspending

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Currently the kernel blindly halts all the processors and calls the
ibm,suspend-me rtas call.  If the firmware is not in the correct
state, we then re-start all the processors and return.  It is much
smarter to first check the firmware state, and only if it is waiting,
call the ibm,suspend-me call.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Dave C Boutcher
2006-06-12 19:49:20 -05:00
committed by Paul Mackerras
parent 0e4aa9c200
commit 368a6ba5d1
3 changed files with 33 additions and 0 deletions
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22
arch/powerpc/kernel/rtas.c
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@@ -593,9 +593,31 @@ out:
static int rtas_ibm_suspend_me(struct rtas_args *args)
{
int i;
long state;
long rc;
unsigned long dummy;
struct rtas_suspend_me_data data;
/* Make sure the state is valid */
rc = plpar_hcall(H_VASI_STATE,
((u64)args->args[0] << 32) | args->args[1],
0, 0, 0,
&state, &dummy, &dummy);
if (rc) {
printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
return rc;
} else if (state == H_VASI_ENABLED) {
args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
return 0;
} else if (state != H_VASI_SUSPENDING) {
printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
state);
args->args[args->nargs] = -1;
return 0;
}
data.waiting = 1;
data.args = args;