254 lines
5.9 KiB
C
254 lines
5.9 KiB
C
/*
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* Performance events support for SH7750-style performance counters
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*
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* Copyright (C) 2009 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/perf_event.h>
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#include <asm/processor.h>
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#define PM_CR_BASE 0xff000084 /* 16-bit */
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#define PM_CTR_BASE 0xff100004 /* 32-bit */
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#define PMCR(n) (PM_CR_BASE + ((n) * 0x04))
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#define PMCTRH(n) (PM_CTR_BASE + 0x00 + ((n) * 0x08))
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#define PMCTRL(n) (PM_CTR_BASE + 0x04 + ((n) * 0x08))
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#define PMCR_PMM_MASK 0x0000003f
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#define PMCR_CLKF 0x00000100
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#define PMCR_PMCLR 0x00002000
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#define PMCR_PMST 0x00004000
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#define PMCR_PMEN 0x00008000
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static struct sh_pmu sh7750_pmu;
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/*
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* There are a number of events supported by each counter (33 in total).
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* Since we have 2 counters, each counter will take the event code as it
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* corresponds to the PMCR PMM setting. Each counter can be configured
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* independently.
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*
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* Event Code Description
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* ---------- -----------
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*
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* 0x01 Operand read access
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* 0x02 Operand write access
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* 0x03 UTLB miss
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* 0x04 Operand cache read miss
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* 0x05 Operand cache write miss
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* 0x06 Instruction fetch (w/ cache)
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* 0x07 Instruction TLB miss
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* 0x08 Instruction cache miss
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* 0x09 All operand accesses
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* 0x0a All instruction accesses
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* 0x0b OC RAM operand access
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* 0x0d On-chip I/O space access
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* 0x0e Operand access (r/w)
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* 0x0f Operand cache miss (r/w)
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* 0x10 Branch instruction
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* 0x11 Branch taken
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* 0x12 BSR/BSRF/JSR
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* 0x13 Instruction execution
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* 0x14 Instruction execution in parallel
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* 0x15 FPU Instruction execution
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* 0x16 Interrupt
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* 0x17 NMI
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* 0x18 trapa instruction execution
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* 0x19 UBCA match
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* 0x1a UBCB match
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* 0x21 Instruction cache fill
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* 0x22 Operand cache fill
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* 0x23 Elapsed time
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* 0x24 Pipeline freeze by I-cache miss
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* 0x25 Pipeline freeze by D-cache miss
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* 0x27 Pipeline freeze by branch instruction
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* 0x28 Pipeline freeze by CPU register
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* 0x29 Pipeline freeze by FPU
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*/
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static const int sh7750_general_events[] = {
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[PERF_COUNT_HW_CPU_CYCLES] = 0x0023,
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[PERF_COUNT_HW_INSTRUCTIONS] = 0x000a,
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[PERF_COUNT_HW_CACHE_REFERENCES] = 0x0006, /* I-cache */
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[PERF_COUNT_HW_CACHE_MISSES] = 0x0008, /* I-cache */
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x0010,
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[PERF_COUNT_HW_BRANCH_MISSES] = -1,
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[PERF_COUNT_HW_BUS_CYCLES] = -1,
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};
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#define C(x) PERF_COUNT_HW_CACHE_##x
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static const int sh7750_cache_events
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[PERF_COUNT_HW_CACHE_MAX]
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[PERF_COUNT_HW_CACHE_OP_MAX]
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[PERF_COUNT_HW_CACHE_RESULT_MAX] =
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{
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[ C(L1D) ] = {
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[ C(OP_READ) ] = {
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[ C(RESULT_ACCESS) ] = 0x0001,
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[ C(RESULT_MISS) ] = 0x0004,
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},
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[ C(OP_WRITE) ] = {
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[ C(RESULT_ACCESS) ] = 0x0002,
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[ C(RESULT_MISS) ] = 0x0005,
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},
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[ C(OP_PREFETCH) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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},
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},
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[ C(L1I) ] = {
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[ C(OP_READ) ] = {
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[ C(RESULT_ACCESS) ] = 0x0006,
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[ C(RESULT_MISS) ] = 0x0008,
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},
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[ C(OP_WRITE) ] = {
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[ C(RESULT_ACCESS) ] = -1,
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[ C(RESULT_MISS) ] = -1,
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},
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[ C(OP_PREFETCH) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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},
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},
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[ C(LL) ] = {
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[ C(OP_READ) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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},
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[ C(OP_WRITE) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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},
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[ C(OP_PREFETCH) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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},
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},
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[ C(DTLB) ] = {
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[ C(OP_READ) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0x0003,
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},
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[ C(OP_WRITE) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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},
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[ C(OP_PREFETCH) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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},
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},
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[ C(ITLB) ] = {
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[ C(OP_READ) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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[ C(RESULT_MISS) ] = 0x0007,
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},
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[ C(OP_WRITE) ] = {
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[ C(RESULT_ACCESS) ] = -1,
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[ C(RESULT_MISS) ] = -1,
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},
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[ C(OP_PREFETCH) ] = {
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[ C(RESULT_ACCESS) ] = -1,
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[ C(RESULT_MISS) ] = -1,
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},
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},
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[ C(BPU) ] = {
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[ C(OP_READ) ] = {
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[ C(RESULT_ACCESS) ] = -1,
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[ C(RESULT_MISS) ] = -1,
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},
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[ C(OP_WRITE) ] = {
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[ C(RESULT_ACCESS) ] = -1,
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[ C(RESULT_MISS) ] = -1,
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},
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[ C(OP_PREFETCH) ] = {
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[ C(RESULT_ACCESS) ] = -1,
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[ C(RESULT_MISS) ] = -1,
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},
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},
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};
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static int sh7750_event_map(int event)
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{
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return sh7750_general_events[event];
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}
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static u64 sh7750_pmu_read(int idx)
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{
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return (u64)((u64)(__raw_readl(PMCTRH(idx)) & 0xffff) << 32) |
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__raw_readl(PMCTRL(idx));
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}
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static void sh7750_pmu_disable(struct hw_perf_event *hwc, int idx)
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{
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unsigned int tmp;
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tmp = __raw_readw(PMCR(idx));
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tmp &= ~(PMCR_PMM_MASK | PMCR_PMEN);
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__raw_writew(tmp, PMCR(idx));
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}
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static void sh7750_pmu_enable(struct hw_perf_event *hwc, int idx)
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{
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__raw_writew(__raw_readw(PMCR(idx)) | PMCR_PMCLR, PMCR(idx));
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__raw_writew(hwc->config | PMCR_PMEN | PMCR_PMST, PMCR(idx));
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}
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static void sh7750_pmu_disable_all(void)
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{
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int i;
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for (i = 0; i < sh7750_pmu.num_events; i++)
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__raw_writew(__raw_readw(PMCR(i)) & ~PMCR_PMEN, PMCR(i));
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}
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static void sh7750_pmu_enable_all(void)
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{
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int i;
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for (i = 0; i < sh7750_pmu.num_events; i++)
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__raw_writew(__raw_readw(PMCR(i)) | PMCR_PMEN, PMCR(i));
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}
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static struct sh_pmu sh7750_pmu = {
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.name = "SH7750",
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.num_events = 2,
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.event_map = sh7750_event_map,
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.max_events = ARRAY_SIZE(sh7750_general_events),
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.raw_event_mask = PMCR_PMM_MASK,
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.cache_events = &sh7750_cache_events,
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.read = sh7750_pmu_read,
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.disable = sh7750_pmu_disable,
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.enable = sh7750_pmu_enable,
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.disable_all = sh7750_pmu_disable_all,
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.enable_all = sh7750_pmu_enable_all,
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};
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static int __init sh7750_pmu_init(void)
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{
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/*
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* Make sure this CPU actually has perf counters.
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*/
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if (!(boot_cpu_data.flags & CPU_HAS_PERF_COUNTER)) {
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pr_notice("HW perf events unsupported, software events only.\n");
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return -ENODEV;
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}
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return register_sh_pmu(&sh7750_pmu);
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}
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arch_initcall(sh7750_pmu_init);
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