~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/testing/selftests/powerpc/pmu/ebb/pmc56_overflow_test.c

Version: ~ [ linux-5.2-rc1 ] ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Copyright 2014, Michael Ellerman, IBM Corp.
  3  * Licensed under GPLv2.
  4  */
  5 
  6 #include <stdio.h>
  7 #include <stdlib.h>
  8 
  9 #include "ebb.h"
 10 
 11 
 12 /*
 13  * Test that PMC5 & 6 are frozen (ie. don't overflow) when they are not being
 14  * used. Tests the MMCR0_FC56 logic in the kernel.
 15  */
 16 
 17 static int pmc56_overflowed;
 18 
 19 static void ebb_callee(void)
 20 {
 21         uint64_t val;
 22 
 23         val = mfspr(SPRN_BESCR);
 24         if (!(val & BESCR_PMEO)) {
 25                 ebb_state.stats.spurious++;
 26                 goto out;
 27         }
 28 
 29         ebb_state.stats.ebb_count++;
 30         count_pmc(2, sample_period);
 31 
 32         val = mfspr(SPRN_PMC5);
 33         if (val >= COUNTER_OVERFLOW)
 34                 pmc56_overflowed++;
 35 
 36         count_pmc(5, COUNTER_OVERFLOW);
 37 
 38         val = mfspr(SPRN_PMC6);
 39         if (val >= COUNTER_OVERFLOW)
 40                 pmc56_overflowed++;
 41 
 42         count_pmc(6, COUNTER_OVERFLOW);
 43 
 44 out:
 45         reset_ebb();
 46 }
 47 
 48 int pmc56_overflow(void)
 49 {
 50         struct event event;
 51 
 52         /* Use PMC2 so we set PMCjCE, which enables PMC5/6 */
 53         event_init(&event, 0x2001e);
 54         event_leader_ebb_init(&event);
 55 
 56         event.attr.exclude_kernel = 1;
 57         event.attr.exclude_hv = 1;
 58         event.attr.exclude_idle = 1;
 59 
 60         FAIL_IF(event_open(&event));
 61 
 62         setup_ebb_handler(ebb_callee);
 63         ebb_global_enable();
 64 
 65         FAIL_IF(ebb_event_enable(&event));
 66 
 67         mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
 68         mtspr(SPRN_PMC5, 0);
 69         mtspr(SPRN_PMC6, 0);
 70 
 71         while (ebb_state.stats.ebb_count < 10)
 72                 FAIL_IF(core_busy_loop());
 73 
 74         ebb_global_disable();
 75         ebb_freeze_pmcs();
 76 
 77         count_pmc(2, sample_period);
 78 
 79         dump_ebb_state();
 80 
 81         printf("PMC5/6 overflow %d\n", pmc56_overflowed);
 82 
 83         event_close(&event);
 84 
 85         FAIL_IF(ebb_state.stats.ebb_count == 0 || pmc56_overflowed != 0);
 86 
 87         return 0;
 88 }
 89 
 90 int main(void)
 91 {
 92         return test_harness(pmc56_overflow, "pmc56_overflow");
 93 }
 94 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp