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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2018-05-21 20:43:57 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2018-10-20 13:26:47 +1100
commitd2bf793237b3aa9c4275a466eef3893eef593691 (patch)
tree50d5fce87bd72bc5eb8793a229020d636afd0b16 /tools/testing/selftests/powerpc/include
parentselftests/powerpc: Move UCONTEXT_NIA() into utils.h (diff)
downloadlinux-dev-d2bf793237b3aa9c4275a466eef3893eef593691.tar.xz
linux-dev-d2bf793237b3aa9c4275a466eef3893eef593691.zip
selftests/powerpc: Add test to verify rfi flush across a system call
This adds a test to verify proper functioning of the rfi flush capability implemented to mitigate meltdown. The test works by measuring the number of L1d cache misses encountered while loading data from memory. Across a system call, since the L1d cache is flushed when rfi_flush is enabled, the number of cache misses is expected to be relative to the number of cachelines corresponding to the data being loaded. The current system setting is reflected via powerpc/rfi_flush under debugfs (assumed to be /sys/kernel/debug/). This test verifies the expected result with rfi_flush enabled as well as when it is disabled. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> [mpe: Add SPDX tags, clang format, skip if the debugfs is missing, use __u64 and SANE_USERSPACE_TYPES to avoid printf() build errors.] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/testing/selftests/powerpc/include')
-rw-r--r--tools/testing/selftests/powerpc/include/utils.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/include/utils.h b/tools/testing/selftests/powerpc/include/utils.h
index da1b963cdb32..49621822d7c3 100644
--- a/tools/testing/selftests/powerpc/include/utils.h
+++ b/tools/testing/selftests/powerpc/include/utils.h
@@ -11,6 +11,7 @@
#include <stdint.h>
#include <stdbool.h>
#include <linux/auxvec.h>
+#include <linux/perf_event.h>
#include "reg.h"
/* Avoid headaches with PRI?64 - just use %ll? always */
@@ -31,6 +32,15 @@ void *get_auxv_entry(int type);
int pick_online_cpu(void);
+int read_debugfs_file(char *debugfs_file, int *result);
+int write_debugfs_file(char *debugfs_file, int result);
+void set_dscr(unsigned long val);
+int perf_event_open_counter(unsigned int type,
+ unsigned long config, int group_fd);
+int perf_event_enable(int fd);
+int perf_event_disable(int fd);
+int perf_event_reset(int fd);
+
static inline bool have_hwcap(unsigned long ftr)
{
return ((unsigned long)get_auxv_entry(AT_HWCAP) & ftr) == ftr;