590 lines
18 KiB
C
590 lines
18 KiB
C
/*
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* ARMv6 Performance counter handling code.
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*
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* Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
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*
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* ARMv6 has 2 configurable performance counters and a single cycle counter.
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* They all share a single reset bit but can be written to zero so we can use
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* that for a reset.
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*
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* The counters can't be individually enabled or disabled so when we remove
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* one event and replace it with another we could get spurious counts from the
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* wrong event. However, we can take advantage of the fact that the
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* performance counters can export events to the event bus, and the event bus
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* itself can be monitored. This requires that we *don't* export the events to
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* the event bus. The procedure for disabling a configurable counter is:
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* - change the counter to count the ETMEXTOUT[0] signal (0x20). This
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* effectively stops the counter from counting.
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* - disable the counter's interrupt generation (each counter has it's
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* own interrupt enable bit).
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* Once stopped, the counter value can be written as 0 to reset.
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*
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* To enable a counter:
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* - enable the counter's interrupt generation.
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* - set the new event type.
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*
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* Note: the dedicated cycle counter only counts cycles and can't be
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* enabled/disabled independently of the others. When we want to disable the
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* cycle counter, we have to just disable the interrupt reporting and start
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* ignoring that counter. When re-enabling, we have to reset the value and
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* enable the interrupt.
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*/
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#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K)
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#include <asm/cputype.h>
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#include <asm/irq_regs.h>
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#include <linux/of.h>
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#include <linux/perf/arm_pmu.h>
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#include <linux/platform_device.h>
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enum armv6_perf_types {
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ARMV6_PERFCTR_ICACHE_MISS = 0x0,
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ARMV6_PERFCTR_IBUF_STALL = 0x1,
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ARMV6_PERFCTR_DDEP_STALL = 0x2,
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ARMV6_PERFCTR_ITLB_MISS = 0x3,
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ARMV6_PERFCTR_DTLB_MISS = 0x4,
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ARMV6_PERFCTR_BR_EXEC = 0x5,
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ARMV6_PERFCTR_BR_MISPREDICT = 0x6,
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ARMV6_PERFCTR_INSTR_EXEC = 0x7,
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ARMV6_PERFCTR_DCACHE_HIT = 0x9,
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ARMV6_PERFCTR_DCACHE_ACCESS = 0xA,
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ARMV6_PERFCTR_DCACHE_MISS = 0xB,
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ARMV6_PERFCTR_DCACHE_WBACK = 0xC,
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ARMV6_PERFCTR_SW_PC_CHANGE = 0xD,
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ARMV6_PERFCTR_MAIN_TLB_MISS = 0xF,
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ARMV6_PERFCTR_EXPL_D_ACCESS = 0x10,
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ARMV6_PERFCTR_LSU_FULL_STALL = 0x11,
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ARMV6_PERFCTR_WBUF_DRAINED = 0x12,
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ARMV6_PERFCTR_CPU_CYCLES = 0xFF,
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ARMV6_PERFCTR_NOP = 0x20,
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};
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enum armv6_counters {
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ARMV6_CYCLE_COUNTER = 0,
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ARMV6_COUNTER0,
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ARMV6_COUNTER1,
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};
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/*
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* The hardware events that we support. We do support cache operations but
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* we have harvard caches and no way to combine instruction and data
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* accesses/misses in hardware.
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*/
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static const unsigned armv6_perf_map[PERF_COUNT_HW_MAX] = {
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PERF_MAP_ALL_UNSUPPORTED,
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[PERF_COUNT_HW_CPU_CYCLES] = ARMV6_PERFCTR_CPU_CYCLES,
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[PERF_COUNT_HW_INSTRUCTIONS] = ARMV6_PERFCTR_INSTR_EXEC,
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6_PERFCTR_BR_EXEC,
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[PERF_COUNT_HW_BRANCH_MISSES] = ARMV6_PERFCTR_BR_MISPREDICT,
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[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV6_PERFCTR_IBUF_STALL,
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[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = ARMV6_PERFCTR_LSU_FULL_STALL,
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};
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static const unsigned armv6_perf_cache_map[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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PERF_CACHE_MAP_ALL_UNSUPPORTED,
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/*
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* The performance counters don't differentiate between read and write
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* accesses/misses so this isn't strictly correct, but it's the best we
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* can do. Writes and reads get combined.
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*/
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[C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
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[C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS,
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[C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
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[C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS,
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[C(L1I)][C(OP_READ)][C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS,
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/*
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* The ARM performance counters can count micro DTLB misses, micro ITLB
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* misses and main TLB misses. There isn't an event for TLB misses, so
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* use the micro misses here and if users want the main TLB misses they
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* can use a raw counter.
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*/
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[C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS,
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[C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS,
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[C(ITLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS,
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[C(ITLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS,
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};
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enum armv6mpcore_perf_types {
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ARMV6MPCORE_PERFCTR_ICACHE_MISS = 0x0,
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ARMV6MPCORE_PERFCTR_IBUF_STALL = 0x1,
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ARMV6MPCORE_PERFCTR_DDEP_STALL = 0x2,
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ARMV6MPCORE_PERFCTR_ITLB_MISS = 0x3,
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ARMV6MPCORE_PERFCTR_DTLB_MISS = 0x4,
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ARMV6MPCORE_PERFCTR_BR_EXEC = 0x5,
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ARMV6MPCORE_PERFCTR_BR_NOTPREDICT = 0x6,
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ARMV6MPCORE_PERFCTR_BR_MISPREDICT = 0x7,
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ARMV6MPCORE_PERFCTR_INSTR_EXEC = 0x8,
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ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS = 0xA,
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ARMV6MPCORE_PERFCTR_DCACHE_RDMISS = 0xB,
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ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS = 0xC,
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ARMV6MPCORE_PERFCTR_DCACHE_WRMISS = 0xD,
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ARMV6MPCORE_PERFCTR_DCACHE_EVICTION = 0xE,
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ARMV6MPCORE_PERFCTR_SW_PC_CHANGE = 0xF,
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ARMV6MPCORE_PERFCTR_MAIN_TLB_MISS = 0x10,
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ARMV6MPCORE_PERFCTR_EXPL_MEM_ACCESS = 0x11,
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ARMV6MPCORE_PERFCTR_LSU_FULL_STALL = 0x12,
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ARMV6MPCORE_PERFCTR_WBUF_DRAINED = 0x13,
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ARMV6MPCORE_PERFCTR_CPU_CYCLES = 0xFF,
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};
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/*
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* The hardware events that we support. We do support cache operations but
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* we have harvard caches and no way to combine instruction and data
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* accesses/misses in hardware.
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*/
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static const unsigned armv6mpcore_perf_map[PERF_COUNT_HW_MAX] = {
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PERF_MAP_ALL_UNSUPPORTED,
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[PERF_COUNT_HW_CPU_CYCLES] = ARMV6MPCORE_PERFCTR_CPU_CYCLES,
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[PERF_COUNT_HW_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_INSTR_EXEC,
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_BR_EXEC,
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[PERF_COUNT_HW_BRANCH_MISSES] = ARMV6MPCORE_PERFCTR_BR_MISPREDICT,
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[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV6MPCORE_PERFCTR_IBUF_STALL,
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[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = ARMV6MPCORE_PERFCTR_LSU_FULL_STALL,
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};
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static const unsigned armv6mpcore_perf_cache_map[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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PERF_CACHE_MAP_ALL_UNSUPPORTED,
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[C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS,
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[C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DCACHE_RDMISS,
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[C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS,
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[C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DCACHE_WRMISS,
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[C(L1I)][C(OP_READ)][C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
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/*
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* The ARM performance counters can count micro DTLB misses, micro ITLB
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* misses and main TLB misses. There isn't an event for TLB misses, so
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* use the micro misses here and if users want the main TLB misses they
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* can use a raw counter.
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*/
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[C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS,
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[C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS,
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[C(ITLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS,
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[C(ITLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS,
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};
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static inline unsigned long
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armv6_pmcr_read(void)
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{
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u32 val;
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asm volatile("mrc p15, 0, %0, c15, c12, 0" : "=r"(val));
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return val;
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}
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static inline void
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armv6_pmcr_write(unsigned long val)
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{
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asm volatile("mcr p15, 0, %0, c15, c12, 0" : : "r"(val));
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}
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#define ARMV6_PMCR_ENABLE (1 << 0)
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#define ARMV6_PMCR_CTR01_RESET (1 << 1)
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#define ARMV6_PMCR_CCOUNT_RESET (1 << 2)
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#define ARMV6_PMCR_CCOUNT_DIV (1 << 3)
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#define ARMV6_PMCR_COUNT0_IEN (1 << 4)
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#define ARMV6_PMCR_COUNT1_IEN (1 << 5)
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#define ARMV6_PMCR_CCOUNT_IEN (1 << 6)
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#define ARMV6_PMCR_COUNT0_OVERFLOW (1 << 8)
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#define ARMV6_PMCR_COUNT1_OVERFLOW (1 << 9)
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#define ARMV6_PMCR_CCOUNT_OVERFLOW (1 << 10)
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#define ARMV6_PMCR_EVT_COUNT0_SHIFT 20
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#define ARMV6_PMCR_EVT_COUNT0_MASK (0xFF << ARMV6_PMCR_EVT_COUNT0_SHIFT)
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#define ARMV6_PMCR_EVT_COUNT1_SHIFT 12
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#define ARMV6_PMCR_EVT_COUNT1_MASK (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT)
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#define ARMV6_PMCR_OVERFLOWED_MASK \
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(ARMV6_PMCR_COUNT0_OVERFLOW | ARMV6_PMCR_COUNT1_OVERFLOW | \
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ARMV6_PMCR_CCOUNT_OVERFLOW)
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static inline int
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armv6_pmcr_has_overflowed(unsigned long pmcr)
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{
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return pmcr & ARMV6_PMCR_OVERFLOWED_MASK;
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}
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static inline int
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armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
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enum armv6_counters counter)
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{
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int ret = 0;
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if (ARMV6_CYCLE_COUNTER == counter)
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ret = pmcr & ARMV6_PMCR_CCOUNT_OVERFLOW;
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else if (ARMV6_COUNTER0 == counter)
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ret = pmcr & ARMV6_PMCR_COUNT0_OVERFLOW;
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else if (ARMV6_COUNTER1 == counter)
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ret = pmcr & ARMV6_PMCR_COUNT1_OVERFLOW;
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else
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WARN_ONCE(1, "invalid counter number (%d)\n", counter);
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return ret;
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}
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static inline u32 armv6pmu_read_counter(struct perf_event *event)
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{
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struct hw_perf_event *hwc = &event->hw;
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int counter = hwc->idx;
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unsigned long value = 0;
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if (ARMV6_CYCLE_COUNTER == counter)
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asm volatile("mrc p15, 0, %0, c15, c12, 1" : "=r"(value));
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else if (ARMV6_COUNTER0 == counter)
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asm volatile("mrc p15, 0, %0, c15, c12, 2" : "=r"(value));
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else if (ARMV6_COUNTER1 == counter)
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asm volatile("mrc p15, 0, %0, c15, c12, 3" : "=r"(value));
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else
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WARN_ONCE(1, "invalid counter number (%d)\n", counter);
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return value;
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}
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static inline void armv6pmu_write_counter(struct perf_event *event, u32 value)
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{
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struct hw_perf_event *hwc = &event->hw;
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int counter = hwc->idx;
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if (ARMV6_CYCLE_COUNTER == counter)
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asm volatile("mcr p15, 0, %0, c15, c12, 1" : : "r"(value));
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else if (ARMV6_COUNTER0 == counter)
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asm volatile("mcr p15, 0, %0, c15, c12, 2" : : "r"(value));
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else if (ARMV6_COUNTER1 == counter)
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asm volatile("mcr p15, 0, %0, c15, c12, 3" : : "r"(value));
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else
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WARN_ONCE(1, "invalid counter number (%d)\n", counter);
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}
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static void armv6pmu_enable_event(struct perf_event *event)
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{
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unsigned long val, mask, evt, flags;
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struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
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struct hw_perf_event *hwc = &event->hw;
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struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
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int idx = hwc->idx;
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if (ARMV6_CYCLE_COUNTER == idx) {
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mask = 0;
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evt = ARMV6_PMCR_CCOUNT_IEN;
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} else if (ARMV6_COUNTER0 == idx) {
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mask = ARMV6_PMCR_EVT_COUNT0_MASK;
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evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) |
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ARMV6_PMCR_COUNT0_IEN;
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} else if (ARMV6_COUNTER1 == idx) {
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mask = ARMV6_PMCR_EVT_COUNT1_MASK;
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evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |
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ARMV6_PMCR_COUNT1_IEN;
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} else {
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WARN_ONCE(1, "invalid counter number (%d)\n", idx);
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return;
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}
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/*
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* Mask out the current event and set the counter to count the event
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* that we're interested in.
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*/
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raw_spin_lock_irqsave(&events->pmu_lock, flags);
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val = armv6_pmcr_read();
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val &= ~mask;
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val |= evt;
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armv6_pmcr_write(val);
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raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
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}
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static irqreturn_t
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armv6pmu_handle_irq(int irq_num,
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void *dev)
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{
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unsigned long pmcr = armv6_pmcr_read();
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struct perf_sample_data data;
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struct arm_pmu *cpu_pmu = (struct arm_pmu *)dev;
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struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
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struct pt_regs *regs;
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int idx;
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if (!armv6_pmcr_has_overflowed(pmcr))
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return IRQ_NONE;
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regs = get_irq_regs();
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/*
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* The interrupts are cleared by writing the overflow flags back to
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* the control register. All of the other bits don't have any effect
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* if they are rewritten, so write the whole value back.
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*/
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armv6_pmcr_write(pmcr);
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for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
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struct perf_event *event = cpuc->events[idx];
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struct hw_perf_event *hwc;
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/* Ignore if we don't have an event. */
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if (!event)
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continue;
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/*
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* We have a single interrupt for all counters. Check that
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* each counter has overflowed before we process it.
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*/
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if (!armv6_pmcr_counter_has_overflowed(pmcr, idx))
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continue;
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hwc = &event->hw;
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armpmu_event_update(event);
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perf_sample_data_init(&data, 0, hwc->last_period);
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if (!armpmu_event_set_period(event))
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continue;
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if (perf_event_overflow(event, &data, regs))
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cpu_pmu->disable(event);
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}
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/*
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* Handle the pending perf events.
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*
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* Note: this call *must* be run with interrupts disabled. For
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* platforms that can have the PMU interrupts raised as an NMI, this
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* will not work.
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*/
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irq_work_run();
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return IRQ_HANDLED;
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}
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static void armv6pmu_start(struct arm_pmu *cpu_pmu)
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{
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unsigned long flags, val;
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struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
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raw_spin_lock_irqsave(&events->pmu_lock, flags);
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val = armv6_pmcr_read();
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val |= ARMV6_PMCR_ENABLE;
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armv6_pmcr_write(val);
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raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
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}
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static void armv6pmu_stop(struct arm_pmu *cpu_pmu)
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{
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unsigned long flags, val;
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struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
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raw_spin_lock_irqsave(&events->pmu_lock, flags);
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val = armv6_pmcr_read();
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val &= ~ARMV6_PMCR_ENABLE;
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armv6_pmcr_write(val);
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raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
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}
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static int
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armv6pmu_get_event_idx(struct pmu_hw_events *cpuc,
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struct perf_event *event)
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{
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struct hw_perf_event *hwc = &event->hw;
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/* Always place a cycle counter into the cycle counter. */
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if (ARMV6_PERFCTR_CPU_CYCLES == hwc->config_base) {
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if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))
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return -EAGAIN;
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return ARMV6_CYCLE_COUNTER;
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} else {
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/*
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* For anything other than a cycle counter, try and use
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* counter0 and counter1.
|
|
*/
|
|
if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask))
|
|
return ARMV6_COUNTER1;
|
|
|
|
if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask))
|
|
return ARMV6_COUNTER0;
|
|
|
|
/* The counters are all in use. */
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
|
|
static void armv6pmu_disable_event(struct perf_event *event)
|
|
{
|
|
unsigned long val, mask, evt, flags;
|
|
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
|
|
int idx = hwc->idx;
|
|
|
|
if (ARMV6_CYCLE_COUNTER == idx) {
|
|
mask = ARMV6_PMCR_CCOUNT_IEN;
|
|
evt = 0;
|
|
} else if (ARMV6_COUNTER0 == idx) {
|
|
mask = ARMV6_PMCR_COUNT0_IEN | ARMV6_PMCR_EVT_COUNT0_MASK;
|
|
evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT0_SHIFT;
|
|
} else if (ARMV6_COUNTER1 == idx) {
|
|
mask = ARMV6_PMCR_COUNT1_IEN | ARMV6_PMCR_EVT_COUNT1_MASK;
|
|
evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT;
|
|
} else {
|
|
WARN_ONCE(1, "invalid counter number (%d)\n", idx);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Mask out the current event and set the counter to count the number
|
|
* of ETM bus signal assertion cycles. The external reporting should
|
|
* be disabled and so this should never increment.
|
|
*/
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
val = armv6_pmcr_read();
|
|
val &= ~mask;
|
|
val |= evt;
|
|
armv6_pmcr_write(val);
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static void armv6mpcore_pmu_disable_event(struct perf_event *event)
|
|
{
|
|
unsigned long val, mask, flags, evt = 0;
|
|
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
|
|
int idx = hwc->idx;
|
|
|
|
if (ARMV6_CYCLE_COUNTER == idx) {
|
|
mask = ARMV6_PMCR_CCOUNT_IEN;
|
|
} else if (ARMV6_COUNTER0 == idx) {
|
|
mask = ARMV6_PMCR_COUNT0_IEN;
|
|
} else if (ARMV6_COUNTER1 == idx) {
|
|
mask = ARMV6_PMCR_COUNT1_IEN;
|
|
} else {
|
|
WARN_ONCE(1, "invalid counter number (%d)\n", idx);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Unlike UP ARMv6, we don't have a way of stopping the counters. We
|
|
* simply disable the interrupt reporting.
|
|
*/
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
val = armv6_pmcr_read();
|
|
val &= ~mask;
|
|
val |= evt;
|
|
armv6_pmcr_write(val);
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static int armv6_map_event(struct perf_event *event)
|
|
{
|
|
return armpmu_map_event(event, &armv6_perf_map,
|
|
&armv6_perf_cache_map, 0xFF);
|
|
}
|
|
|
|
static void armv6pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
cpu_pmu->handle_irq = armv6pmu_handle_irq;
|
|
cpu_pmu->enable = armv6pmu_enable_event;
|
|
cpu_pmu->disable = armv6pmu_disable_event;
|
|
cpu_pmu->read_counter = armv6pmu_read_counter;
|
|
cpu_pmu->write_counter = armv6pmu_write_counter;
|
|
cpu_pmu->get_event_idx = armv6pmu_get_event_idx;
|
|
cpu_pmu->start = armv6pmu_start;
|
|
cpu_pmu->stop = armv6pmu_stop;
|
|
cpu_pmu->map_event = armv6_map_event;
|
|
cpu_pmu->num_events = 3;
|
|
cpu_pmu->max_period = (1LLU << 32) - 1;
|
|
}
|
|
|
|
static int armv6_1136_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
armv6pmu_init(cpu_pmu);
|
|
cpu_pmu->name = "armv6_1136";
|
|
return 0;
|
|
}
|
|
|
|
static int armv6_1156_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
armv6pmu_init(cpu_pmu);
|
|
cpu_pmu->name = "armv6_1156";
|
|
return 0;
|
|
}
|
|
|
|
static int armv6_1176_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
armv6pmu_init(cpu_pmu);
|
|
cpu_pmu->name = "armv6_1176";
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ARMv6mpcore is almost identical to single core ARMv6 with the exception
|
|
* that some of the events have different enumerations and that there is no
|
|
* *hack* to stop the programmable counters. To stop the counters we simply
|
|
* disable the interrupt reporting and update the event. When unthrottling we
|
|
* reset the period and enable the interrupt reporting.
|
|
*/
|
|
|
|
static int armv6mpcore_map_event(struct perf_event *event)
|
|
{
|
|
return armpmu_map_event(event, &armv6mpcore_perf_map,
|
|
&armv6mpcore_perf_cache_map, 0xFF);
|
|
}
|
|
|
|
static int armv6mpcore_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
cpu_pmu->name = "armv6_11mpcore";
|
|
cpu_pmu->handle_irq = armv6pmu_handle_irq;
|
|
cpu_pmu->enable = armv6pmu_enable_event;
|
|
cpu_pmu->disable = armv6mpcore_pmu_disable_event;
|
|
cpu_pmu->read_counter = armv6pmu_read_counter;
|
|
cpu_pmu->write_counter = armv6pmu_write_counter;
|
|
cpu_pmu->get_event_idx = armv6pmu_get_event_idx;
|
|
cpu_pmu->start = armv6pmu_start;
|
|
cpu_pmu->stop = armv6pmu_stop;
|
|
cpu_pmu->map_event = armv6mpcore_map_event;
|
|
cpu_pmu->num_events = 3;
|
|
cpu_pmu->max_period = (1LLU << 32) - 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id armv6_pmu_of_device_ids[] = {
|
|
{.compatible = "arm,arm11mpcore-pmu", .data = armv6mpcore_pmu_init},
|
|
{.compatible = "arm,arm1176-pmu", .data = armv6_1176_pmu_init},
|
|
{.compatible = "arm,arm1136-pmu", .data = armv6_1136_pmu_init},
|
|
{ /* sentinel value */ }
|
|
};
|
|
|
|
static const struct pmu_probe_info armv6_pmu_probe_table[] = {
|
|
ARM_PMU_PROBE(ARM_CPU_PART_ARM1136, armv6_1136_pmu_init),
|
|
ARM_PMU_PROBE(ARM_CPU_PART_ARM1156, armv6_1156_pmu_init),
|
|
ARM_PMU_PROBE(ARM_CPU_PART_ARM1176, armv6_1176_pmu_init),
|
|
ARM_PMU_PROBE(ARM_CPU_PART_ARM11MPCORE, armv6mpcore_pmu_init),
|
|
{ /* sentinel value */ }
|
|
};
|
|
|
|
static int armv6_pmu_device_probe(struct platform_device *pdev)
|
|
{
|
|
return arm_pmu_device_probe(pdev, armv6_pmu_of_device_ids,
|
|
armv6_pmu_probe_table);
|
|
}
|
|
|
|
static struct platform_driver armv6_pmu_driver = {
|
|
.driver = {
|
|
.name = "armv6-pmu",
|
|
.of_match_table = armv6_pmu_of_device_ids,
|
|
},
|
|
.probe = armv6_pmu_device_probe,
|
|
};
|
|
|
|
static int __init register_armv6_pmu_driver(void)
|
|
{
|
|
return platform_driver_register(&armv6_pmu_driver);
|
|
}
|
|
device_initcall(register_armv6_pmu_driver);
|
|
#endif /* CONFIG_CPU_V6 || CONFIG_CPU_V6K */
|