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author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-12 20:11:38 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-12 20:11:38 -0700 |
commit | b7c8c1945cfbcfb9d60f5be957b4339c6eee4201 (patch) | |
tree | ef27f4b91fc98fcea70b8ef2b7d917c9814a0fbb /tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c | |
parent | 88bbfb4a6267ff90a466ade9762d9a8fff2bb1bb (diff) | |
parent | ad718622ab6d500c870772b1b8dda46fa2195e6d (diff) |
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
Pull more powerpc updates from Ben Herrenschmidt:
"Here are the remaining bits I was mentioning earlier. Mostly bug
fixes and new selftests from Michael (yay !). He also removed the WSP
platform and A2 core support which were dead before release, so less
clutter.
One little "feature" I snuck in is the doorbell IPI support for
non-virtualized P8 which speeds up IPIs significantly between threads
of a core"
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (34 commits)
powerpc/book3s: Fix some ABIv2 issues in machine check code
powerpc/book3s: Fix guest MC delivery mechanism to avoid soft lockups in guest.
powerpc/book3s: Increment the mce counter during machine_check_early call.
powerpc/book3s: Add stack overflow check in machine check handler.
powerpc/book3s: Fix machine check handling for unhandled errors
powerpc/eeh: Dump PE location code
powerpc/powernv: Enable POWER8 doorbell IPIs
powerpc/cpuidle: Only clear LPCR decrementer wakeup bit on fast sleep entry
powerpc/powernv: Fix killed EEH event
powerpc: fix typo 'CONFIG_PMAC'
powerpc: fix typo 'CONFIG_PPC_CPU'
powerpc/powernv: Don't escalate non-existing frozen PE
powerpc/eeh: Report frozen parent PE prior to child PE
powerpc/eeh: Clear frozen state for child PE
powerpc/powernv: Reduce panic timeout from 180s to 10s
powerpc/xmon: avoid format string leaking to printk
selftests/powerpc: Add tests of PMU EBBs
selftests/powerpc: Add support for skipping tests
selftests/powerpc: Put the test in a separate process group
selftests/powerpc: Fix instruction loop for ABIv2 (LE)
...
Diffstat (limited to 'tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c')
-rw-r--r-- | tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c b/tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c new file mode 100644 index 000000000000..d56607e4ffab --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/ebb/task_event_pinned_vs_ebb_test.c @@ -0,0 +1,91 @@ +/* + * Copyright 2014, Michael Ellerman, IBM Corp. + * Licensed under GPLv2. + */ + +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdbool.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <unistd.h> + +#include "ebb.h" + + +/* + * Tests a pinned per-task event vs an EBB - in that order. The pinned per-task + * event should prevent the EBB event from being enabled. + */ + +static int setup_child_event(struct event *event, pid_t child_pid) +{ + event_init_named(event, 0x400FA, "PM_RUN_INST_CMPL"); + + event->attr.pinned = 1; + + event->attr.exclude_kernel = 1; + event->attr.exclude_hv = 1; + event->attr.exclude_idle = 1; + + FAIL_IF(event_open_with_pid(event, child_pid)); + FAIL_IF(event_enable(event)); + + return 0; +} + +int task_event_pinned_vs_ebb(void) +{ + union pipe read_pipe, write_pipe; + struct event event; + pid_t pid; + int rc; + + FAIL_IF(pipe(read_pipe.fds) == -1); + FAIL_IF(pipe(write_pipe.fds) == -1); + + pid = fork(); + if (pid == 0) { + /* NB order of pipes looks reversed */ + exit(ebb_child(write_pipe, read_pipe)); + } + + /* We setup the task event first */ + rc = setup_child_event(&event, pid); + if (rc) { + kill_child_and_wait(pid); + return rc; + } + + /* Signal the child to install its EBB event and wait */ + if (sync_with_child(read_pipe, write_pipe)) + /* If it fails, wait for it to exit */ + goto wait; + + /* Signal the child to run */ + FAIL_IF(sync_with_child(read_pipe, write_pipe)); + +wait: + /* We expect it to fail to read the event */ + FAIL_IF(wait_for_child(pid) != 2); + FAIL_IF(event_disable(&event)); + FAIL_IF(event_read(&event)); + + event_report(&event); + + FAIL_IF(event.result.value == 0); + /* + * For reasons I don't understand enabled is usually just slightly + * lower than running. Would be good to confirm why. + */ + FAIL_IF(event.result.enabled == 0); + FAIL_IF(event.result.running == 0); + + return 0; +} + +int main(void) +{ + return test_harness(task_event_pinned_vs_ebb, "task_event_pinned_vs_ebb"); +} |