@@ -73,6 +73,7 @@ extern void mdesc_register_notifier(struct mdesc_notifier_client *client);
extern void mdesc_fill_in_cpu_data(cpumask_t *mask);
extern void mdesc_populate_present_mask(cpumask_t *mask);
+extern void mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask);
extern void sun4v_mdesc_init(void);
@@ -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);
@@ -83,6 +83,8 @@ unsigned long kpte_linear_bitmap[KPTE_BITMAP_BYTES / sizeof(unsigned long)];
extern struct tsb swapper_4m_tsb[KERNEL_TSB4M_NENTRIES];
#endif
+static unsigned long cpu_pgsz_mask;
+
#define MAX_BANKS 32
static struct linux_prom64_registers pavail[MAX_BANKS] __devinitdata;
@@ -419,6 +421,12 @@ EXPORT_SYMBOL(flush_icache_range);
void mmu_info(struct seq_file *m)
{
+ static const char *pgsz_strings[] = {
+ "8K", "64K", "512K", "4MB", "32MB",
+ "256MB", "2GB", "16GB",
+ };
+ int i, printed;
+
if (tlb_type == cheetah)
seq_printf(m, "MMU Type\t: Cheetah\n");
else if (tlb_type == cheetah_plus)
@@ -430,6 +438,17 @@ void mmu_info(struct seq_file *m)
else
seq_printf(m, "MMU Type\t: ???\n");
+ seq_printf(m, "MMU PGSZs\t: ");
+ printed = 0;
+ for (i = 0; i < ARRAY_SIZE(pgsz_strings); i++) {
+ if (cpu_pgsz_mask & (1UL << i)) {
+ seq_printf(m, "%s%s",
+ printed ? "," : "", pgsz_strings[i]);
+ printed++;
+ }
+ }
+ seq_putc(m, '\n');
+
#ifdef CONFIG_DEBUG_DCFLUSH
seq_printf(m, "DCPageFlushes\t: %d\n",
atomic_read(&dcpage_flushes));
@@ -1803,6 +1822,18 @@ void __init paging_init(void)
#ifndef CONFIG_SMP
mdesc_fill_in_cpu_data(cpu_all_mask);
#endif
+ mdesc_get_page_sizes(cpu_all_mask, &cpu_pgsz_mask);
+ } else {
+ unsigned long impl, ver;
+
+ cpu_pgsz_mask = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
+ HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
+
+ __asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
+ impl = ((ver >> 32) & 0xffff);
+ if (impl == PANTHER_IMPL)
+ cpu_pgsz_mask |= (HV_PGSZ_MASK_32MB |
+ HV_PGSZ_MASK_256MB);
}
/* Setup bootmem... */
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> --- arch/sparc/include/asm/mdesc.h | 1 + arch/sparc/kernel/mdesc.c | 24 ++++++++++++++++++++++++ arch/sparc/mm/init_64.c | 31 +++++++++++++++++++++++++++++++ 3 files changed, 56 insertions(+)