powerpc/pseries: Add kernel parameter to disable batched hcalls
This introduces a pair of kernel parameters that can be used to disable
the MULTITCE and BULK_REMOVE h-calls.
By default, those hcalls are enabled, active, and good for throughput
and performance. The ability to disable them will be useful for some of
the PREEMPT_RT related investigation and work occurring on Power.
Signed-off-by: Will Schmidt <will_schmidt@vnet.ibm.com>
cc: Olof Johansson <olof@lixom.net>
cc: Anton Blanchard <anton@samba.org>
cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index f129040..5d3ea9f 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -627,6 +627,18 @@
spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
}
+static int __init disable_bulk_remove(char *str)
+{
+ if (strcmp(str, "off") == 0 &&
+ firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
+ printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
+ powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
+ }
+ return 1;
+}
+
+__setup("bulk_remove=", disable_bulk_remove);
+
void __init hpte_init_lpar(void)
{
ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;