tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_marked_sample_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2022, Kajol Jain, IBM Corp.
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8
   9 #include "../event.h"
  10 #include "misc.h"
  11 #include "utils.h"
  12
  13 /*
  14  * Primary PMU event used here is PM_MRK_INST_CMPL (0x401e0)
  15  * Threshold event selection used is issue to complete for cycles
  16  * Sampling criteria is Load only sampling
  17  */
  18 #define EventCode 0x35340401e0
  19
  20 extern void thirty_two_instruction_loop_with_ll_sc(u64 loops, u64 *ll_sc_target);
  21
  22 /* A perf sampling test to test mmcra fields */
  23 static int mmcra_thresh_marked_sample(void)
  24 {
  25         struct event event;
  26         u64 *intr_regs;
  27         u64 dummy;
  28
  29         /* Check for platform support for the test */
  30         SKIP_IF(check_pvr_for_sampling_tests());
  31
  32         /* Init the event for the sampling test */
  33         event_init_sampling(&event, EventCode);
  34         event.attr.sample_regs_intr = platform_extended_mask;
  35         FAIL_IF(event_open(&event));
  36         event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
  37
  38         FAIL_IF(event_enable(&event));
  39
  40         /* workload to make the event overflow */
  41         thirty_two_instruction_loop_with_ll_sc(1000000, &dummy);
  42
  43         FAIL_IF(event_disable(&event));
  44
  45         /* Check for sample count */
  46         FAIL_IF(!collect_samples(event.mmap_buffer));
  47
  48         intr_regs = get_intr_regs(&event, event.mmap_buffer);
  49
  50         /* Check for intr_regs */
  51         FAIL_IF(!intr_regs);
  52
  53         /*
  54          * Verify that thresh sel/start/stop, marked, random sample
  55          * eligibility, sdar mode and sample mode fields match with
  56          * the corresponding event code fields
  57          */
  58         FAIL_IF(EV_CODE_EXTRACT(event.attr.config, thd_sel) !=
  59                         get_mmcra_thd_sel(get_reg_value(intr_regs, "MMCRA"), 4));
  60         FAIL_IF(EV_CODE_EXTRACT(event.attr.config, thd_start) !=
  61                         get_mmcra_thd_start(get_reg_value(intr_regs, "MMCRA"), 4));
  62         FAIL_IF(EV_CODE_EXTRACT(event.attr.config, thd_stop) !=
  63                         get_mmcra_thd_stop(get_reg_value(intr_regs, "MMCRA"), 4));
  64         FAIL_IF(EV_CODE_EXTRACT(event.attr.config, marked) !=
  65                         get_mmcra_marked(get_reg_value(intr_regs, "MMCRA"), 4));
  66         FAIL_IF((EV_CODE_EXTRACT(event.attr.config, sample) >> 2) !=
  67                         get_mmcra_rand_samp_elig(get_reg_value(intr_regs, "MMCRA"), 4));
  68         FAIL_IF((EV_CODE_EXTRACT(event.attr.config, sample) & 0x3) !=
  69                         get_mmcra_sample_mode(get_reg_value(intr_regs, "MMCRA"), 4));
  70         FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sm) !=
  71                         get_mmcra_sm(get_reg_value(intr_regs, "MMCRA"), 4));
  72
  73         event_close(&event);
  74         return 0;
  75 }
  76
  77 int main(void)
  78 {
  79         return test_harness(mmcra_thresh_marked_sample, "mmcra_thresh_marked_sample");
  80 }