powerpc/mm: Add a parameter to disable 1TB segs
This patch adds the kernel command line parameter "no_tb_segs" which
forces the kernel to use 256MB rather than 1TB segments. Forcing the use
of 256MB segments makes it considerably easier to test code that depends
on an SLB miss occurring.
Suggested-by: Michael Neuling <mikey@neuling.org>
Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index b2740c6..fab46db 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -317,6 +317,15 @@
return ret;
}
+static bool disable_1tb_segments = false;
+
+static int __init parse_disable_1tb_segments(char *p)
+{
+ disable_1tb_segments = true;
+ return 0;
+}
+early_param("disable_1tb_segments", parse_disable_1tb_segments);
+
static int __init htab_dt_scan_seg_sizes(unsigned long node,
const char *uname, int depth,
void *data)
@@ -335,6 +344,12 @@
for (; size >= 4; size -= 4, ++prop) {
if (be32_to_cpu(prop[0]) == 40) {
DBG("1T segment support detected\n");
+
+ if (disable_1tb_segments) {
+ DBG("1T segments disabled by command line\n");
+ break;
+ }
+
cur_cpu_spec->mmu_features |= MMU_FTR_1T_SEGMENT;
return 1;
}