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sparc64: Probe cpu page size support more portably.

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On sun4v, interrogate the machine description.  This code is extremely
defensive in nature, and a lot of the checks can probably be removed.

On sun4u things are a lot simpler.  There are the page sizes all chips
support, and then Panther adds 32MB and 256MB pages.

Report the probed value in /proc/cpuinfo

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2012-09-06 19:01:25 -07:00
parent 4f93d21d25
commit ce33fdc52a
3 changed files with 56 additions and 0 deletions
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24
arch/sparc/kernel/mdesc.c
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@@ -817,6 +817,30 @@ void __cpuinit mdesc_populate_present_mask(cpumask_t *mask)
mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
}
static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
{
const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
unsigned long *pgsz_mask = arg;
u64 val;
val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
if (pgsz_prop)
val = *pgsz_prop;
if (!*pgsz_mask)
*pgsz_mask = val;
else
*pgsz_mask &= val;
return NULL;
}
void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
{
*pgsz_mask = 0;
mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
}
static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
{
const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);