MN10300: Cache: Implement SMP global cache flushing
Implement SMP global cache flushing for MN10300. This will be used by the AM34
which is SMP capable.
Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/arch/mn10300/mm/cache-inv-icache.c b/arch/mn10300/mm/cache-inv-icache.c
index 4a3f7af..a8933a6 100644
--- a/arch/mn10300/mm/cache-inv-icache.c
+++ b/arch/mn10300/mm/cache-inv-icache.c
@@ -12,6 +12,8 @@
#include <linux/module.h>
#include <linux/mm.h>
#include <asm/cacheflush.h>
+#include <asm/smp.h>
+#include "cache-smp.h"
/**
* flush_icache_page_range - Flush dcache and invalidate icache for part of a
@@ -66,7 +68,8 @@
addr = page_to_phys(page);
/* invalidate the icache coverage on that region */
- mn10300_icache_inv_range2(addr + off, size);
+ mn10300_local_icache_inv_range2(addr + off, size);
+ smp_cache_call(SMP_ICACHE_INV_FLUSH_RANGE, start, end);
}
/**
@@ -81,28 +84,31 @@
void flush_icache_range(unsigned long start, unsigned long end)
{
unsigned long start_page, end_page;
+ unsigned long flags;
+
+ flags = smp_lock_cache();
if (end > 0x80000000UL) {
/* addresses above 0xa0000000 do not go through the cache */
if (end > 0xa0000000UL) {
end = 0xa0000000UL;
if (start >= end)
- return;
+ goto done;
}
/* kernel addresses between 0x80000000 and 0x9fffffff do not
* require page tables, so we just map such addresses
* directly */
start_page = (start >= 0x80000000UL) ? start : 0x80000000UL;
- mn10300_dcache_flush_range(start_page, end);
mn10300_icache_inv_range(start_page, end);
+ smp_cache_call(SMP_ICACHE_INV_FLUSH_RANGE, start, end);
if (start_page == start)
- return;
+ goto done;
end = start_page;
}
start_page = start & PAGE_MASK;
- end_page = end & PAGE_MASK;
+ end_page = (end - 1) & PAGE_MASK;
if (start_page == end_page) {
/* the first and last bytes are on the same page */
@@ -113,7 +119,11 @@
flush_icache_page_range(end_page, end);
} else {
/* more than 2 pages; just flush the entire cache */
- mn10300_icache_inv();
+ mn10300_local_icache_inv();
+ smp_cache_call(SMP_ICACHE_INV, 0, 0);
}
+
+done:
+ smp_unlock_cache(flags);
}
EXPORT_SYMBOL(flush_icache_range);