439 lines
11 KiB
C
439 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
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* Added mmcra[slot] support:
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* Copyright (C) 2006-2007 Will Schmidt <willschm@us.ibm.com>, IBM
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*/
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#include <linux/oprofile.h>
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#include <linux/smp.h>
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#include <asm/firmware.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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#include <asm/cputable.h>
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#include <asm/rtas.h>
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#include <asm/oprofile_impl.h>
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#include <asm/reg.h>
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#define dbg(args...)
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#define OPROFILE_PM_PMCSEL_MSK 0xffULL
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#define OPROFILE_PM_UNIT_SHIFT 60
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#define OPROFILE_PM_UNIT_MSK 0xfULL
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#define OPROFILE_MAX_PMC_NUM 3
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#define OPROFILE_PMSEL_FIELD_WIDTH 8
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#define OPROFILE_UNIT_FIELD_WIDTH 4
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#define MMCRA_SIAR_VALID_MASK 0x10000000ULL
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static unsigned long reset_value[OP_MAX_COUNTER];
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static int oprofile_running;
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static int use_slot_nums;
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/* mmcr values are set in power4_reg_setup, used in power4_cpu_setup */
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static u32 mmcr0_val;
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static u64 mmcr1_val;
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static u64 mmcra_val;
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static u32 cntr_marked_events;
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static int power7_marked_instr_event(u64 mmcr1)
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{
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u64 psel, unit;
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int pmc, cntr_marked_events = 0;
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/* Given the MMCR1 value, look at the field for each counter to
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* determine if it is a marked event. Code based on the function
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* power7_marked_instr_event() in file arch/powerpc/perf/power7-pmu.c.
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*/
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for (pmc = 0; pmc < 4; pmc++) {
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psel = mmcr1 & (OPROFILE_PM_PMCSEL_MSK
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<< (OPROFILE_MAX_PMC_NUM - pmc)
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* OPROFILE_PMSEL_FIELD_WIDTH);
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psel = (psel >> ((OPROFILE_MAX_PMC_NUM - pmc)
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* OPROFILE_PMSEL_FIELD_WIDTH)) & ~1ULL;
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unit = mmcr1 & (OPROFILE_PM_UNIT_MSK
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<< (OPROFILE_PM_UNIT_SHIFT
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- (pmc * OPROFILE_PMSEL_FIELD_WIDTH )));
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unit = unit >> (OPROFILE_PM_UNIT_SHIFT
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- (pmc * OPROFILE_PMSEL_FIELD_WIDTH));
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switch (psel >> 4) {
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case 2:
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cntr_marked_events |= (pmc == 1 || pmc == 3) << pmc;
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break;
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case 3:
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if (psel == 0x3c) {
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cntr_marked_events |= (pmc == 0) << pmc;
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break;
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}
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if (psel == 0x3e) {
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cntr_marked_events |= (pmc != 1) << pmc;
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break;
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}
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cntr_marked_events |= 1 << pmc;
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break;
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case 4:
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case 5:
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cntr_marked_events |= (unit == 0xd) << pmc;
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break;
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case 6:
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if (psel == 0x64)
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cntr_marked_events |= (pmc >= 2) << pmc;
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break;
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case 8:
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cntr_marked_events |= (unit == 0xd) << pmc;
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break;
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}
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}
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return cntr_marked_events;
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}
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static int power4_reg_setup(struct op_counter_config *ctr,
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struct op_system_config *sys,
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int num_ctrs)
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{
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int i;
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/*
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* The performance counter event settings are given in the mmcr0,
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* mmcr1 and mmcra values passed from the user in the
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* op_system_config structure (sys variable).
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*/
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mmcr0_val = sys->mmcr0;
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mmcr1_val = sys->mmcr1;
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mmcra_val = sys->mmcra;
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/* Power 7+ and newer architectures:
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* Determine which counter events in the group (the group of events is
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* specified by the bit settings in the MMCR1 register) are marked
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* events for use in the interrupt handler. Do the calculation once
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* before OProfile starts. Information is used in the interrupt
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* handler. Starting with Power 7+ we only record the sample for
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* marked events if the SIAR valid bit is set. For non marked events
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* the sample is always recorded.
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*/
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if (pvr_version_is(PVR_POWER7p))
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cntr_marked_events = power7_marked_instr_event(mmcr1_val);
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else
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cntr_marked_events = 0; /* For older processors, set the bit map
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* to zero so the sample will always be
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* be recorded.
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*/
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for (i = 0; i < cur_cpu_spec->num_pmcs; ++i)
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reset_value[i] = 0x80000000UL - ctr[i].count;
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/* setup user and kernel profiling */
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if (sys->enable_kernel)
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mmcr0_val &= ~MMCR0_KERNEL_DISABLE;
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else
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mmcr0_val |= MMCR0_KERNEL_DISABLE;
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if (sys->enable_user)
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mmcr0_val &= ~MMCR0_PROBLEM_DISABLE;
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else
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mmcr0_val |= MMCR0_PROBLEM_DISABLE;
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if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p) ||
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pvr_version_is(PVR_970) || pvr_version_is(PVR_970FX) ||
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pvr_version_is(PVR_970MP) || pvr_version_is(PVR_970GX) ||
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pvr_version_is(PVR_POWER5) || pvr_version_is(PVR_POWER5p))
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use_slot_nums = 1;
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return 0;
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}
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extern void ppc_enable_pmcs(void);
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/*
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* Older CPUs require the MMCRA sample bit to be always set, but newer
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* CPUs only want it set for some groups. Eventually we will remove all
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* knowledge of this bit in the kernel, oprofile userspace should be
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* setting it when required.
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*
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* In order to keep current installations working we force the bit for
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* those older CPUs. Once everyone has updated their oprofile userspace we
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* can remove this hack.
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*/
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static inline int mmcra_must_set_sample(void)
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{
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if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p) ||
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pvr_version_is(PVR_970) || pvr_version_is(PVR_970FX) ||
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pvr_version_is(PVR_970MP) || pvr_version_is(PVR_970GX))
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return 1;
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return 0;
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}
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static int power4_cpu_setup(struct op_counter_config *ctr)
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{
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unsigned int mmcr0 = mmcr0_val;
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unsigned long mmcra = mmcra_val;
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ppc_enable_pmcs();
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/* set the freeze bit */
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mmcr0 |= MMCR0_FC;
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mtspr(SPRN_MMCR0, mmcr0);
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mmcr0 |= MMCR0_FCM1|MMCR0_PMXE|MMCR0_FCECE;
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mmcr0 |= MMCR0_PMC1CE|MMCR0_PMCjCE;
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mtspr(SPRN_MMCR0, mmcr0);
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mtspr(SPRN_MMCR1, mmcr1_val);
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if (mmcra_must_set_sample())
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mmcra |= MMCRA_SAMPLE_ENABLE;
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mtspr(SPRN_MMCRA, mmcra);
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dbg("setup on cpu %d, mmcr0 %lx\n", smp_processor_id(),
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mfspr(SPRN_MMCR0));
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dbg("setup on cpu %d, mmcr1 %lx\n", smp_processor_id(),
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mfspr(SPRN_MMCR1));
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dbg("setup on cpu %d, mmcra %lx\n", smp_processor_id(),
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mfspr(SPRN_MMCRA));
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return 0;
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}
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static int power4_start(struct op_counter_config *ctr)
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{
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int i;
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unsigned int mmcr0;
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/* set the PMM bit (see comment below) */
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mtmsr(mfmsr() | MSR_PMM);
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for (i = 0; i < cur_cpu_spec->num_pmcs; ++i) {
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if (ctr[i].enabled) {
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classic_ctr_write(i, reset_value[i]);
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} else {
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classic_ctr_write(i, 0);
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}
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}
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mmcr0 = mfspr(SPRN_MMCR0);
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/*
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* We must clear the PMAO bit on some (GQ) chips. Just do it
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* all the time
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*/
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mmcr0 &= ~MMCR0_PMAO;
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/*
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* now clear the freeze bit, counting will not start until we
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* rfid from this excetion, because only at that point will
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* the PMM bit be cleared
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*/
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mmcr0 &= ~MMCR0_FC;
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mtspr(SPRN_MMCR0, mmcr0);
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oprofile_running = 1;
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dbg("start on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
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return 0;
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}
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static void power4_stop(void)
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{
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unsigned int mmcr0;
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/* freeze counters */
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mmcr0 = mfspr(SPRN_MMCR0);
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mmcr0 |= MMCR0_FC;
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mtspr(SPRN_MMCR0, mmcr0);
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oprofile_running = 0;
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dbg("stop on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
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mb();
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}
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/* Fake functions used by canonicalize_pc */
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static void __used hypervisor_bucket(void)
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{
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}
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static void __used rtas_bucket(void)
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{
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}
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static void __used kernel_unknown_bucket(void)
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{
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}
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/*
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* On GQ and newer the MMCRA stores the HV and PR bits at the time
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* the SIAR was sampled. We use that to work out if the SIAR was sampled in
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* the hypervisor, our exception vectors or RTAS.
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* If the MMCRA_SAMPLE_ENABLE bit is set, we can use the MMCRA[slot] bits
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* to more accurately identify the address of the sampled instruction. The
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* mmcra[slot] bits represent the slot number of a sampled instruction
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* within an instruction group. The slot will contain a value between 1
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* and 5 if MMCRA_SAMPLE_ENABLE is set, otherwise 0.
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*/
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static unsigned long get_pc(struct pt_regs *regs)
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{
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unsigned long pc = mfspr(SPRN_SIAR);
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unsigned long mmcra;
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unsigned long slot;
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/* Can't do much about it */
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if (!cur_cpu_spec->oprofile_mmcra_sihv)
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return pc;
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mmcra = mfspr(SPRN_MMCRA);
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if (use_slot_nums && (mmcra & MMCRA_SAMPLE_ENABLE)) {
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slot = ((mmcra & MMCRA_SLOT) >> MMCRA_SLOT_SHIFT);
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if (slot > 1)
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pc += 4 * (slot - 1);
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}
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/* Were we in the hypervisor? */
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if (firmware_has_feature(FW_FEATURE_LPAR) &&
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(mmcra & cur_cpu_spec->oprofile_mmcra_sihv))
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/* function descriptor madness */
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return *((unsigned long *)hypervisor_bucket);
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/* We were in userspace, nothing to do */
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if (mmcra & cur_cpu_spec->oprofile_mmcra_sipr)
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return pc;
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#ifdef CONFIG_PPC_RTAS
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/* Were we in RTAS? */
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if (pc >= rtas.base && pc < (rtas.base + rtas.size))
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/* function descriptor madness */
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return *((unsigned long *)rtas_bucket);
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#endif
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/* Were we in our exception vectors or SLB real mode miss handler? */
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if (pc < 0x1000000UL)
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return (unsigned long)__va(pc);
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/* Not sure where we were */
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if (!is_kernel_addr(pc))
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/* function descriptor madness */
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return *((unsigned long *)kernel_unknown_bucket);
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return pc;
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}
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static int get_kernel(unsigned long pc, unsigned long mmcra)
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{
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int is_kernel;
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if (!cur_cpu_spec->oprofile_mmcra_sihv) {
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is_kernel = is_kernel_addr(pc);
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} else {
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is_kernel = ((mmcra & cur_cpu_spec->oprofile_mmcra_sipr) == 0);
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}
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return is_kernel;
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}
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static bool pmc_overflow(unsigned long val)
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{
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if ((int)val < 0)
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return true;
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/*
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* Events on POWER7 can roll back if a speculative event doesn't
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* eventually complete. Unfortunately in some rare cases they will
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* raise a performance monitor exception. We need to catch this to
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* ensure we reset the PMC. In all cases the PMC will be 256 or less
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* cycles from overflow.
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*
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* We only do this if the first pass fails to find any overflowing
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* PMCs because a user might set a period of less than 256 and we
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* don't want to mistakenly reset them.
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*/
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if (pvr_version_is(PVR_POWER7) && ((0x80000000 - val) <= 256))
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return true;
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return false;
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}
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static void power4_handle_interrupt(struct pt_regs *regs,
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struct op_counter_config *ctr)
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{
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unsigned long pc;
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int is_kernel;
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int val;
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int i;
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unsigned int mmcr0;
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unsigned long mmcra;
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bool siar_valid = false;
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mmcra = mfspr(SPRN_MMCRA);
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pc = get_pc(regs);
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is_kernel = get_kernel(pc, mmcra);
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/* set the PMM bit (see comment below) */
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mtmsr(mfmsr() | MSR_PMM);
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/* Check that the SIAR valid bit in MMCRA is set to 1. */
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if ((mmcra & MMCRA_SIAR_VALID_MASK) == MMCRA_SIAR_VALID_MASK)
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siar_valid = true;
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for (i = 0; i < cur_cpu_spec->num_pmcs; ++i) {
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val = classic_ctr_read(i);
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if (pmc_overflow(val)) {
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if (oprofile_running && ctr[i].enabled) {
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/* Power 7+ and newer architectures:
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* If the event is a marked event, then only
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* save the sample if the SIAR valid bit is
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* set. If the event is not marked, then
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* always save the sample.
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* Note, the Sample enable bit in the MMCRA
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* register must be set to 1 if the group
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* contains a marked event.
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*/
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if ((siar_valid &&
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(cntr_marked_events & (1 << i)))
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|| !(cntr_marked_events & (1 << i)))
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oprofile_add_ext_sample(pc, regs, i,
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is_kernel);
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classic_ctr_write(i, reset_value[i]);
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} else {
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classic_ctr_write(i, 0);
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}
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}
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}
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mmcr0 = mfspr(SPRN_MMCR0);
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/* reset the perfmon trigger */
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mmcr0 |= MMCR0_PMXE;
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/*
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* We must clear the PMAO bit on some (GQ) chips. Just do it
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* all the time
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*/
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mmcr0 &= ~MMCR0_PMAO;
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/* Clear the appropriate bits in the MMCRA */
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mmcra &= ~cur_cpu_spec->oprofile_mmcra_clear;
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mtspr(SPRN_MMCRA, mmcra);
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/*
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* now clear the freeze bit, counting will not start until we
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* rfid from this exception, because only at that point will
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* the PMM bit be cleared
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*/
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mmcr0 &= ~MMCR0_FC;
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mtspr(SPRN_MMCR0, mmcr0);
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}
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struct op_powerpc_model op_model_power4 = {
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.reg_setup = power4_reg_setup,
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.cpu_setup = power4_cpu_setup,
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.start = power4_start,
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.stop = power4_stop,
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.handle_interrupt = power4_handle_interrupt,
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};
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