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ARCv2: Add PMU SLC support driver
Driver to support L2$ performance measurement unit (PMU) for ARCv2.
1 parent 21d14d5 commit 39fa9d7

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‎arch/arc/boot/dts/haps_hs.dts‎

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chosen {
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bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 console=ttyS0,115200n8 debug print-fatal-signals=1";
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};
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arcpct1: pct_slc {
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compatible = "snps,arcv2-slc-pmu";
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};
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};

‎arch/arc/boot/dts/haps_hs_idu.dts‎

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chosen {
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bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 console=ttyS0,115200n8 debug print-fatal-signals=1";
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};
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arcpct1: pct_slc {
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compatible = "snps,arcv2-slc-pmu";
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};
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};

‎arch/arc/include/asm/perf_slc.h‎

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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Linux SLC(L2$) performance counter support for ARCv2
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*
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* Copyright (C) 2014-2022 Synopsys, Inc. (www.synopsys.com)
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*/
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#ifndef __ASM_PERF_EVENT_SLC_H
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#define __ASM_PERF_EVENT_SLC_H
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#define SLC_AUX_CACHE_PCT_NUMMBER 32 // maximum number of SLC performance counters
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#define ARCV2_SLC_NUM_OF_EVENTS 64 // number of SLC events
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#define CSM_BUILD 0xE5
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#define SLC_BUILD 0xCE
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#define SLC_AUX_CACHE_CONFIG 0x901
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#define SLC_AUX_PM_CMD 0x926
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#define SLC_AUX_PM_EVENT 0x927
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#define SLC_AUX_PM_OVF 0x928
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#define SLC_AUX_PM_CNT0 0x929
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#define SLC_AUX_PM_CNT1 0x92A
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#define SLC_AUX_PM_CMD_ENABLE 0x0
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#define SLC_AUX_PM_CMD_DISABLE 0x1
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#define SLC_AUX_PM_CMD_READ 0x2
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#define SLC_AUX_PM_CMD_READ_CLEAR 0x3
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#define SLC_AUX_PM_CMD_PRESET 0x4
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#define SLC_AUX_PM_CMD_DISABLE_ALL 0x5
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#define SLC_AUX_PM_CMD_CLEAR_ALL 0x6
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struct csm_build {
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#ifdef CONFIG_CPU_BIG_ENDIAN
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u32 res:8, csmecc1:2, csm_sz1:4, mpnum:2, bcycle:2, csmecc:2, csmsz:4, ver:8;
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#else
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u32 ver:8, csmsz:4, csmecc:2, bcycle:2, mpnum:2, csm_sz1:4, csmecc1:2, res:8;
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#endif
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};
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struct slc_build {
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#ifdef CONFIG_CPU_BIG_ENDIAN
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u32 res:16, num:8, ver:8;
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#else
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u32 ver:8, num:8, res:16;
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#endif
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};
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struct slc_aux_cache_config {
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#ifdef CONFIG_CPU_BIG_ENDIAN
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u32 r:2, b:1, pm_num:5, pms:2, tag_time:4, tbank:3, data_time:4, dbank:3, ways:2 \
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lsz:2, cache_sz:4;
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#else
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u32 cache_sz:4, lsz:2, ways:2, dbank:3, data_time:4, tbank:3, tag_time:4, pms:2, \
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pm_num:5, b:1, r:2;
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#endif
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};
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struct slc_aux_pm_cmd {
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#ifdef CONFIG_CPU_BIG_ENDIAN
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u32 res:15, evt:8, cnum:5, cmd:4;
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#else
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u32 cmd:4, cnum:5, evt:8, res:15;
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#endif
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};
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struct slc_aux_pm_event {
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#ifdef CONFIG_CPU_BIG_ENDIAN
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u32 res:23, evt:8, pe:1;
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#else
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u32 pe:1, evt:8, res:23;
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#endif
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};
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struct slc_aux_pm_ovf {
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u32 counter_overflow;
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};
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struct slc_aux_pm_cnt {
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u32 cnt;
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};
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static void arc_perf_event_update(struct perf_event *event,
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struct hw_perf_event *hwc, int idx);
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#define ARCPMU_EVENT_NAME_LEN (31+1) // +1 for null terminator
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// assign names to events according to PRM
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char pct_names[ARCV2_SLC_NUM_OF_EVENTS][ARCPMU_EVENT_NAME_LEN]={
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"TotReqPort0",
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"TotReqPort1",
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"TotReqPort2",
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"TotReqPort3",
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"TotReqPort4",
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"TotReqPort5",
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"TotReqPort6",
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"TotReqPort7",
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"TotReqPort8",
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"TotReqPort9",
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"TotReqPort10",
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"TotReqPort11",
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"TotReqPort12",
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"TotReqPort13",
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"TotReqPort14",
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"TotReqPort15",
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"TotCoreReqAllP",
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"TotRdReqAllPort",
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"TotWrReqAllPort",
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"TotalTagMiss",
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"ReadTagMiss",
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"WriteTagMiss",
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"TotStallCycDueToTagQfull",
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"NumOfReqWithTagQfull",
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"TotStallCycDueToDatQfull",
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"NumOfReqWithDataQfull",
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"TotStallCycDueToStatQfull",
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"NumOfReqWithStatQfull",
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"TotStallCycForInpReqAllP",
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"TotStallCycForTagMiss",
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"TotMissReqStall",
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"TotNumOf32ByteEvictions",
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"TotNumOfCacheLineEvictions",
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"TotNumOfStalledCycForInpReq",
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"TotNumOfStalledReq",
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"TotStalledWrReq",
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"TotStalledReq",
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"TotCacheMissReq",
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"CntCacheLineAsPendReq",
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"CntCacheLineAsPendTagMiss",
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"CntRdReqCacheLineAsTagMiss",
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"CntWrReqCacheLineAsTagMiss",
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"CntOfDataPrefetchReq",
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"CntOfInstrPrefetchReq",
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"Reserved0",
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"Reserved1",
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"Reserved2",
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"Reserved3",
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"TotStallReqForPort0",
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"TotStallReqForPort1",
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"TotStallReqForPort2",
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"TotStallReqForPort3",
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"TotStallReqForPort4",
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"TotStallReqForPort5",
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"TotStallReqForPort6",
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"TotStallReqForPort7",
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"TotStallReqForPort8",
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"TotStallReqForPort9",
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"TotStallReqForPort10",
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"TotStallReqForPort11",
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"TotStallReqForPort12",
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"TotStallReqForPort13",
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"TotStallReqForPort14",
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"TotStallReqForPort15"
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};
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#define CONDITION_NONE_NUMBER 44 // using Reserved_0 condition number as no event
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#endif

‎arch/arc/kernel/Makefile‎

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@@ -25,7 +25,7 @@ obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_ARC_EMUL_UNALIGNED) += unaligned.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_ARC_METAWARE_HLINK) += arc_hostlink.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cluster.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cluster.o perf_slc.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o

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