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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c')
-rw-r--r-- | kernel/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/kernel/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c b/kernel/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c new file mode 100644 index 000000000..986500fd2 --- /dev/null +++ b/kernel/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c @@ -0,0 +1,106 @@ +/* + * Copyright 2014, Michael Ellerman, IBM Corp. + * Licensed under GPLv2. + */ + +#include <sched.h> +#include <signal.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> + +#include "ebb.h" + + +/* + * Test that the kernel properly handles PMAE across context switches. + * + * We test this by calling into the kernel inside our EBB handler, where PMAE + * is clear. A cpu eater companion thread is running on the same CPU as us to + * encourage the scheduler to switch us. + * + * The kernel must make sure that when it context switches us back in, it + * honours the fact that we had PMAE clear. + * + * Observed to hit the failing case on the first EBB with a broken kernel. + */ + +static bool mmcr0_mismatch; +static uint64_t before, after; + +static void syscall_ebb_callee(void) +{ + uint64_t val; + + val = mfspr(SPRN_BESCR); + if (!(val & BESCR_PMEO)) { + ebb_state.stats.spurious++; + goto out; + } + + ebb_state.stats.ebb_count++; + count_pmc(1, sample_period); + + before = mfspr(SPRN_MMCR0); + + /* Try and get ourselves scheduled, to force a PMU context switch */ + sched_yield(); + + after = mfspr(SPRN_MMCR0); + if (before != after) + mmcr0_mismatch = true; + +out: + reset_ebb(); +} + +static int test_body(void) +{ + struct event event; + + event_init_named(&event, 0x1001e, "cycles"); + event_leader_ebb_init(&event); + + event.attr.exclude_kernel = 1; + event.attr.exclude_hv = 1; + event.attr.exclude_idle = 1; + + FAIL_IF(event_open(&event)); + + setup_ebb_handler(syscall_ebb_callee); + ebb_global_enable(); + + FAIL_IF(ebb_event_enable(&event)); + + mtspr(SPRN_PMC1, pmc_sample_period(sample_period)); + + while (ebb_state.stats.ebb_count < 20 && !mmcr0_mismatch) + FAIL_IF(core_busy_loop()); + + ebb_global_disable(); + ebb_freeze_pmcs(); + + count_pmc(1, sample_period); + + dump_ebb_state(); + + if (mmcr0_mismatch) + printf("Saw MMCR0 before 0x%lx after 0x%lx\n", before, after); + + event_close(&event); + + FAIL_IF(ebb_state.stats.ebb_count == 0); + FAIL_IF(mmcr0_mismatch); + + return 0; +} + +int pmae_handling(void) +{ + return eat_cpu(test_body); +} + +int main(void) +{ + return test_harness(pmae_handling, "pmae_handling"); +} |