sparc64: Probe cpu page size support more portably.
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>
diff --git a/arch/sparc/kernel/mdesc.c b/arch/sparc/kernel/mdesc.c
index 6dc7962..831c001 100644
--- a/arch/sparc/kernel/mdesc.c
+++ b/arch/sparc/kernel/mdesc.c
@@ -817,6 +817,30 @@
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);