The appended patch implements flush_data_cache_page for SB-1(a). This
fixes the bcm1480 hanging at boot after "Freeing unused kernel memory"
when booting from NFS (and likely also any other PIO-driven device).
Thiemo
Signed-Off-By: Thiemo Seufer <ths@xxxxxxxxxxxx>
diff --git a/arch/mips/mm/c-sb1.c b/arch/mips/mm/c-sb1.c
index 16bad7c..acae51c 100644
--- a/arch/mips/mm/c-sb1.c
+++ b/arch/mips/mm/c-sb1.c
@@ -19,6 +19,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/init.h>
+#include <linux/hardirq.h>
#include <asm/asm.h>
#include <asm/bootinfo.h>
@@ -233,6 +234,25 @@ void sb1_flush_cache_page(struct vm_area
__attribute__((alias("local_sb1_flush_cache_page")));
#endif
+#ifdef CONFIG_SMP
+static void sb1_flush_cache_data_page_ipi(void *info)
+{
+ unsigned long start = (unsigned long)info;
+
+ __sb1_writeback_inv_dcache_range(start, start + PAGE_SIZE);
+}
+
+static void sb1_flush_cache_data_page(unsigned long addr)
+{
+ if (in_atomic())
+ __sb1_writeback_inv_dcache_range(addr, addr + PAGE_SIZE);
+ else
+ on_each_cpu(sb1_flush_cache_data_page_ipi, (void *) addr, 1, 1);
+}
+#else
+void sb1_flush_cache_data_page(unsigned long)
+ __attribute__((alias("local_sb1_flush_cache_data_page")));
+#endif
/*
* Invalidate all caches on this CPU
@@ -504,7 +524,6 @@ static __init void probe_cache_sizes(voi
void sb1_cache_init(void)
{
extern char except_vec2_sb1;
- extern char handle_vec2_sb1;
/* Special cache error handler for SB1 */
set_uncached_handler (0x100, &except_vec2_sb1, 0x80);
@@ -534,7 +553,7 @@ #endif
flush_cache_sigtramp = sb1_flush_cache_sigtramp;
local_flush_data_cache_page = (void *) sb1_nop;
- flush_data_cache_page = (void *) sb1_nop;
+ flush_data_cache_page = sb1_flush_cache_data_page;
/* Full flush */
__flush_cache_all = sb1___flush_cache_all;
@@ -558,5 +577,5 @@ #endif
:
: "memory");
- flush_cache_all();
+ local_sb1___flush_cache_all();
}
