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powerpc: Enable relocation on during exceptions at boot

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We currently do this synchronously at boot from setup_arch. On a large
system this could hypothetically take a little while to complete, so
currently we will give up if we are asked to wait for more than a second
in total.

If we actually start hitting that timeout in practice we can always move
this code into a kernel thread to take care of it in the background.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Ian Munsie 2012-11-08 16:03:14 +11:00 committed by Benjamin Herrenschmidt
parent cca55d9ddf
commit fc8effa4e4
1 changed files with 38 additions and 0 deletions
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38
arch/powerpc/platforms/pseries/setup.c
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@ -367,6 +367,36 @@ static void pSeries_idle(void)
}
}
/*
* Enable relocation on during exceptions. This has partition wide scope and
* may take a while to complete, if it takes longer than one second we will
* just give up rather than wasting any more time on this - if that turns out
* to ever be a problem in practice we can move this into a kernel thread to
* finish off the process later in boot.
*/
static int __init pSeries_enable_reloc_on_exc(void)
{
long rc;
unsigned int delay, total_delay = 0;
while (1) {
rc = enable_reloc_on_exceptions();
if (!H_IS_LONG_BUSY(rc))
return rc;
delay = get_longbusy_msecs(rc);
total_delay += delay;
if (total_delay > 1000) {
pr_warn("Warning: Giving up waiting to enable "
"relocation on exceptions (%u msec)!\n",
total_delay);
return rc;
}
mdelay(delay);
}
}
static void __init pSeries_setup_arch(void)
{
panic_timeout = 10;
@ -402,6 +432,14 @@ static void __init pSeries_setup_arch(void)
ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
else
ppc_md.enable_pmcs = power4_enable_pmcs;
if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
long rc;
if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
pr_warn("Unable to enable relocation on exceptions: "
"%ld\n", rc);
}
}
}
static int __init pSeries_init_panel(void)