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selftests/powerpc/pmu: Add macros to parse event codes

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Each platform has raw event encoding format which specifies the bit
positions for different fields. The fields from event code gets
translated into performance monitoring mode control register (MMCRx)
settings. Patch add macros to extract individual fields from the event
code.

Add functions for sanity checks, since testcases currently are only
supported in power9 and power10.

Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
[mpe: Read PVR directly rather than using /proc/cpuinfo]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220127072012.662451-4-kjain@linux.ibm.com
This commit is contained in:
Madhavan Srinivasan
2022-01-27 12:49:55 +05:30
committed by Michael Ellerman
parent c315669e2f
commit 6523dce862
4 changed files with 172 additions and 2 deletions
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132
tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
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@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2022, Athira Rajeev, IBM Corp.
* Copyright 2022, Madhavan Srinivasan, IBM Corp.
*/
#include <unistd.h>
@@ -16,6 +17,137 @@
#define PAGE_SIZE sysconf(_SC_PAGESIZE)
/* Storage for platform version */
int pvr;
u64 platform_extended_mask;
/* Mask and Shift for Event code fields */
int ev_mask_pmcxsel, ev_shift_pmcxsel; //pmcxsel field
int ev_mask_marked, ev_shift_marked; //marked filed
int ev_mask_comb, ev_shift_comb; //combine field
int ev_mask_unit, ev_shift_unit; //unit field
int ev_mask_pmc, ev_shift_pmc; //pmc field
int ev_mask_cache, ev_shift_cache; //Cache sel field
int ev_mask_sample, ev_shift_sample; //Random sampling field
int ev_mask_thd_sel, ev_shift_thd_sel; //thresh_sel field
int ev_mask_thd_start, ev_shift_thd_start; //thresh_start field
int ev_mask_thd_stop, ev_shift_thd_stop; //thresh_stop field
int ev_mask_thd_cmp, ev_shift_thd_cmp; //thresh cmp field
int ev_mask_sm, ev_shift_sm; //SDAR mode field
int ev_mask_rsq, ev_shift_rsq; //radix scope qual field
int ev_mask_l2l3, ev_shift_l2l3; //l2l3 sel field
int ev_mask_mmcr3_src, ev_shift_mmcr3_src; //mmcr3 field
static void init_ev_encodes(void)
{
ev_mask_pmcxsel = 0xff;
ev_shift_pmcxsel = 0;
ev_mask_marked = 1;
ev_shift_marked = 8;
ev_mask_unit = 0xf;
ev_shift_unit = 12;
ev_mask_pmc = 0xf;
ev_shift_pmc = 16;
ev_mask_sample = 0x1f;
ev_shift_sample = 24;
ev_mask_thd_sel = 0x7;
ev_shift_thd_sel = 29;
ev_mask_thd_start = 0xf;
ev_shift_thd_start = 36;
ev_mask_thd_stop = 0xf;
ev_shift_thd_stop = 32;
switch (pvr) {
case POWER10:
ev_mask_rsq = 1;
ev_shift_rsq = 9;
ev_mask_comb = 3;
ev_shift_comb = 10;
ev_mask_cache = 3;
ev_shift_cache = 20;
ev_mask_sm = 0x3;
ev_shift_sm = 22;
ev_mask_l2l3 = 0x1f;
ev_shift_l2l3 = 40;
ev_mask_mmcr3_src = 0x7fff;
ev_shift_mmcr3_src = 45;
break;
case POWER9:
ev_mask_comb = 3;
ev_shift_comb = 10;
ev_mask_cache = 0xf;
ev_shift_cache = 20;
ev_mask_thd_cmp = 0x3ff;
ev_shift_thd_cmp = 40;
ev_mask_sm = 0x3;
ev_shift_sm = 50;
break;
default:
FAIL_IF_EXIT(1);
}
}
/* Return the extended regs mask value */
static u64 perf_get_platform_reg_mask(void)
{
if (have_hwcap2(PPC_FEATURE2_ARCH_3_1))
return PERF_POWER10_MASK;
if (have_hwcap2(PPC_FEATURE2_ARCH_3_00))
return PERF_POWER9_MASK;
return -1;
}
int check_extended_regs_support(void)
{
int fd;
struct event event;
event_init(&event, 0x1001e);
event.attr.type = 4;
event.attr.sample_period = 1;
event.attr.disabled = 1;
event.attr.sample_type = PERF_SAMPLE_REGS_INTR;
event.attr.sample_regs_intr = platform_extended_mask;
fd = event_open(&event);
if (fd != -1)
return 0;
return -1;
}
int check_pvr_for_sampling_tests(void)
{
pvr = PVR_VER(mfspr(SPRN_PVR));
platform_extended_mask = perf_get_platform_reg_mask();
/*
* Check for supported platforms
* for sampling test
*/
if ((pvr != POWER10) && (pvr != POWER9))
goto out;
/*
* Check PMU driver registered by looking for
* PPC_FEATURE2_EBB bit in AT_HWCAP2
*/
if (!have_hwcap2(PPC_FEATURE2_EBB))
goto out;
/* check if platform supports extended regs */
if (check_extended_regs_support())
goto out;
init_ev_encodes();
return 0;
out:
printf("%s: Sampling tests un-supported\n", __func__);
return -1;
}
/*
* Allocate mmap buffer of "mmap_pages" number of
* pages.