forked from Minki/linux
ef923214a4
Although the perf_counter API allows 63-bit raw event codes, internally in the powerpc back-end we had been using 32-bit event codes. This expands them to 64 bits so that we can add bits for specifying threshold start/stop events and instruction sampling modes later. This also corrects the return value of can_go_on_limited_pmc; we were returning an event code rather than just a 0/1 value in some circumstances. That didn't particularly matter while event codes were 32-bit, but now that event codes are 64-bit it might, so this fixes it. [ Impact: extend PowerPC perfcounter interfaces from u32 to u64 ] Signed-off-by: Paul Mackerras <paulus@samba.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <18955.36874.472452.353104@drongo.ozlabs.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
558 lines
15 KiB
C
558 lines
15 KiB
C
/*
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* Performance counter support for POWER4 (GP) and POWER4+ (GQ) processors.
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*
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* Copyright 2009 Paul Mackerras, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/perf_counter.h>
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#include <asm/reg.h>
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/*
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* Bits in event code for POWER4
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*/
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#define PM_PMC_SH 12 /* PMC number (1-based) for direct events */
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#define PM_PMC_MSK 0xf
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#define PM_UNIT_SH 8 /* TTMMUX number and setting - unit select */
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#define PM_UNIT_MSK 0xf
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#define PM_LOWER_SH 6
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#define PM_LOWER_MSK 1
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#define PM_LOWER_MSKS 0x40
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#define PM_BYTE_SH 4 /* Byte number of event bus to use */
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#define PM_BYTE_MSK 3
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#define PM_PMCSEL_MSK 7
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/*
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* Unit code values
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*/
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#define PM_FPU 1
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#define PM_ISU1 2
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#define PM_IFU 3
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#define PM_IDU0 4
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#define PM_ISU1_ALT 6
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#define PM_ISU2 7
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#define PM_IFU_ALT 8
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#define PM_LSU0 9
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#define PM_LSU1 0xc
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#define PM_GPS 0xf
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/*
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* Bits in MMCR0 for POWER4
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*/
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#define MMCR0_PMC1SEL_SH 8
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#define MMCR0_PMC2SEL_SH 1
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#define MMCR_PMCSEL_MSK 0x1f
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/*
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* Bits in MMCR1 for POWER4
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*/
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#define MMCR1_TTM0SEL_SH 62
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#define MMCR1_TTC0SEL_SH 61
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#define MMCR1_TTM1SEL_SH 59
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#define MMCR1_TTC1SEL_SH 58
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#define MMCR1_TTM2SEL_SH 56
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#define MMCR1_TTC2SEL_SH 55
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#define MMCR1_TTM3SEL_SH 53
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#define MMCR1_TTC3SEL_SH 52
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#define MMCR1_TTMSEL_MSK 3
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#define MMCR1_TD_CP_DBG0SEL_SH 50
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#define MMCR1_TD_CP_DBG1SEL_SH 48
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#define MMCR1_TD_CP_DBG2SEL_SH 46
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#define MMCR1_TD_CP_DBG3SEL_SH 44
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#define MMCR1_DEBUG0SEL_SH 43
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#define MMCR1_DEBUG1SEL_SH 42
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#define MMCR1_DEBUG2SEL_SH 41
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#define MMCR1_DEBUG3SEL_SH 40
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#define MMCR1_PMC1_ADDER_SEL_SH 39
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#define MMCR1_PMC2_ADDER_SEL_SH 38
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#define MMCR1_PMC6_ADDER_SEL_SH 37
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#define MMCR1_PMC5_ADDER_SEL_SH 36
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#define MMCR1_PMC8_ADDER_SEL_SH 35
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#define MMCR1_PMC7_ADDER_SEL_SH 34
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#define MMCR1_PMC3_ADDER_SEL_SH 33
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#define MMCR1_PMC4_ADDER_SEL_SH 32
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#define MMCR1_PMC3SEL_SH 27
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#define MMCR1_PMC4SEL_SH 22
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#define MMCR1_PMC5SEL_SH 17
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#define MMCR1_PMC6SEL_SH 12
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#define MMCR1_PMC7SEL_SH 7
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#define MMCR1_PMC8SEL_SH 2 /* note bit 0 is in MMCRA for GP */
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static short mmcr1_adder_bits[8] = {
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MMCR1_PMC1_ADDER_SEL_SH,
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MMCR1_PMC2_ADDER_SEL_SH,
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MMCR1_PMC3_ADDER_SEL_SH,
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MMCR1_PMC4_ADDER_SEL_SH,
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MMCR1_PMC5_ADDER_SEL_SH,
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MMCR1_PMC6_ADDER_SEL_SH,
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MMCR1_PMC7_ADDER_SEL_SH,
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MMCR1_PMC8_ADDER_SEL_SH
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};
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/*
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* Bits in MMCRA
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*/
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#define MMCRA_PMC8SEL0_SH 17 /* PMC8SEL bit 0 for GP */
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/*
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* Layout of constraint bits:
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* 6666555555555544444444443333333333222222222211111111110000000000
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* 3210987654321098765432109876543210987654321098765432109876543210
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* |[ >[ >[ >|||[ >[ >< >< >< >< ><><><><><><><><>
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* | UC1 UC2 UC3 ||| PS1 PS2 B0 B1 B2 B3 P1P2P3P4P5P6P7P8
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* \SMPL ||\TTC3SEL
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* |\TTC_IFU_SEL
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* \TTM2SEL0
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*
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* SMPL - SAMPLE_ENABLE constraint
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* 56: SAMPLE_ENABLE value 0x0100_0000_0000_0000
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*
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* UC1 - unit constraint 1: can't have all three of FPU/ISU1/IDU0|ISU2
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* 55: UC1 error 0x0080_0000_0000_0000
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* 54: FPU events needed 0x0040_0000_0000_0000
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* 53: ISU1 events needed 0x0020_0000_0000_0000
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* 52: IDU0|ISU2 events needed 0x0010_0000_0000_0000
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*
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* UC2 - unit constraint 2: can't have all three of FPU/IFU/LSU0
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* 51: UC2 error 0x0008_0000_0000_0000
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* 50: FPU events needed 0x0004_0000_0000_0000
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* 49: IFU events needed 0x0002_0000_0000_0000
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* 48: LSU0 events needed 0x0001_0000_0000_0000
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*
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* UC3 - unit constraint 3: can't have all four of LSU0/IFU/IDU0|ISU2/ISU1
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* 47: UC3 error 0x8000_0000_0000
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* 46: LSU0 events needed 0x4000_0000_0000
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* 45: IFU events needed 0x2000_0000_0000
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* 44: IDU0|ISU2 events needed 0x1000_0000_0000
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* 43: ISU1 events needed 0x0800_0000_0000
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*
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* TTM2SEL0
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* 42: 0 = IDU0 events needed
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* 1 = ISU2 events needed 0x0400_0000_0000
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*
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* TTC_IFU_SEL
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* 41: 0 = IFU.U events needed
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* 1 = IFU.L events needed 0x0200_0000_0000
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*
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* TTC3SEL
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* 40: 0 = LSU1.U events needed
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* 1 = LSU1.L events needed 0x0100_0000_0000
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*
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* PS1
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* 39: PS1 error 0x0080_0000_0000
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* 36-38: count of events needing PMC1/2/5/6 0x0070_0000_0000
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*
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* PS2
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* 35: PS2 error 0x0008_0000_0000
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* 32-34: count of events needing PMC3/4/7/8 0x0007_0000_0000
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*
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* B0
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* 28-31: Byte 0 event source 0xf000_0000
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* 1 = FPU
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* 2 = ISU1
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* 3 = IFU
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* 4 = IDU0
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* 7 = ISU2
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* 9 = LSU0
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* c = LSU1
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* f = GPS
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*
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* B1, B2, B3
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* 24-27, 20-23, 16-19: Byte 1, 2, 3 event sources
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*
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* P8
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* 15: P8 error 0x8000
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* 14-15: Count of events needing PMC8
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*
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* P1..P7
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* 0-13: Count of events needing PMC1..PMC7
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*
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* Note: this doesn't allow events using IFU.U to be combined with events
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* using IFU.L, though that is feasible (using TTM0 and TTM2). However
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* there are no listed events for IFU.L (they are debug events not
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* verified for performance monitoring) so this shouldn't cause a
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* problem.
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*/
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static struct unitinfo {
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u64 value, mask;
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int unit;
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int lowerbit;
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} p4_unitinfo[16] = {
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[PM_FPU] = { 0x44000000000000ull, 0x88000000000000ull, PM_FPU, 0 },
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[PM_ISU1] = { 0x20080000000000ull, 0x88000000000000ull, PM_ISU1, 0 },
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[PM_ISU1_ALT] =
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{ 0x20080000000000ull, 0x88000000000000ull, PM_ISU1, 0 },
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[PM_IFU] = { 0x02200000000000ull, 0x08820000000000ull, PM_IFU, 41 },
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[PM_IFU_ALT] =
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{ 0x02200000000000ull, 0x08820000000000ull, PM_IFU, 41 },
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[PM_IDU0] = { 0x10100000000000ull, 0x80840000000000ull, PM_IDU0, 1 },
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[PM_ISU2] = { 0x10140000000000ull, 0x80840000000000ull, PM_ISU2, 0 },
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[PM_LSU0] = { 0x01400000000000ull, 0x08800000000000ull, PM_LSU0, 0 },
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[PM_LSU1] = { 0x00000000000000ull, 0x00010000000000ull, PM_LSU1, 40 },
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[PM_GPS] = { 0x00000000000000ull, 0x00000000000000ull, PM_GPS, 0 }
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};
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static unsigned char direct_marked_event[8] = {
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(1<<2) | (1<<3), /* PMC1: PM_MRK_GRP_DISP, PM_MRK_ST_CMPL */
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(1<<3) | (1<<5), /* PMC2: PM_THRESH_TIMEO, PM_MRK_BRU_FIN */
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(1<<3), /* PMC3: PM_MRK_ST_CMPL_INT */
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(1<<4) | (1<<5), /* PMC4: PM_MRK_GRP_CMPL, PM_MRK_CRU_FIN */
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(1<<4) | (1<<5), /* PMC5: PM_MRK_GRP_TIMEO */
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(1<<3) | (1<<4) | (1<<5),
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/* PMC6: PM_MRK_ST_GPS, PM_MRK_FXU_FIN, PM_MRK_GRP_ISSUED */
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(1<<4) | (1<<5), /* PMC7: PM_MRK_FPU_FIN, PM_MRK_INST_FIN */
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(1<<4), /* PMC8: PM_MRK_LSU_FIN */
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};
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/*
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* Returns 1 if event counts things relating to marked instructions
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* and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
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*/
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static int p4_marked_instr_event(u64 event)
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{
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int pmc, psel, unit, byte, bit;
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unsigned int mask;
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pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
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psel = event & PM_PMCSEL_MSK;
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if (pmc) {
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if (direct_marked_event[pmc - 1] & (1 << psel))
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return 1;
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if (psel == 0) /* add events */
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bit = (pmc <= 4)? pmc - 1: 8 - pmc;
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else if (psel == 6) /* decode events */
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bit = 4;
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else
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return 0;
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} else
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bit = psel;
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byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
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unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
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mask = 0;
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switch (unit) {
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case PM_LSU1:
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if (event & PM_LOWER_MSKS)
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mask = 1 << 28; /* byte 7 bit 4 */
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else
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mask = 6 << 24; /* byte 3 bits 1 and 2 */
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break;
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case PM_LSU0:
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/* byte 3, bit 3; byte 2 bits 0,2,3,4,5; byte 1 */
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mask = 0x083dff00;
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}
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return (mask >> (byte * 8 + bit)) & 1;
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}
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static int p4_get_constraint(u64 event, u64 *maskp, u64 *valp)
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{
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int pmc, byte, unit, lower, sh;
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u64 mask = 0, value = 0;
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int grp = -1;
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pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
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if (pmc) {
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if (pmc > 8)
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return -1;
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sh = (pmc - 1) * 2;
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mask |= 2 << sh;
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value |= 1 << sh;
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grp = ((pmc - 1) >> 1) & 1;
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}
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unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
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byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
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if (unit) {
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lower = (event >> PM_LOWER_SH) & PM_LOWER_MSK;
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/*
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* Bus events on bytes 0 and 2 can be counted
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* on PMC1/2/5/6; bytes 1 and 3 on PMC3/4/7/8.
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*/
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if (!pmc)
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grp = byte & 1;
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if (!p4_unitinfo[unit].unit)
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return -1;
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mask |= p4_unitinfo[unit].mask;
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value |= p4_unitinfo[unit].value;
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sh = p4_unitinfo[unit].lowerbit;
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if (sh > 1)
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value |= (u64)lower << sh;
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else if (lower != sh)
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return -1;
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unit = p4_unitinfo[unit].unit;
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/* Set byte lane select field */
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mask |= 0xfULL << (28 - 4 * byte);
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value |= (u64)unit << (28 - 4 * byte);
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}
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if (grp == 0) {
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/* increment PMC1/2/5/6 field */
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mask |= 0x8000000000ull;
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value |= 0x1000000000ull;
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} else {
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/* increment PMC3/4/7/8 field */
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mask |= 0x800000000ull;
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value |= 0x100000000ull;
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}
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/* Marked instruction events need sample_enable set */
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if (p4_marked_instr_event(event)) {
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mask |= 1ull << 56;
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value |= 1ull << 56;
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}
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/* PMCSEL=6 decode events on byte 2 need sample_enable clear */
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if (pmc && (event & PM_PMCSEL_MSK) == 6 && byte == 2)
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mask |= 1ull << 56;
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*maskp = mask;
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*valp = value;
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return 0;
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}
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static unsigned int ppc_inst_cmpl[] = {
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0x1001, 0x4001, 0x6001, 0x7001, 0x8001
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};
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static int p4_get_alternatives(u64 event, unsigned int flags, u64 alt[])
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{
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int i, j, na;
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alt[0] = event;
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na = 1;
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/* 2 possibilities for PM_GRP_DISP_REJECT */
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if (event == 0x8003 || event == 0x0224) {
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alt[1] = event ^ (0x8003 ^ 0x0224);
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return 2;
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}
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/* 2 possibilities for PM_ST_MISS_L1 */
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if (event == 0x0c13 || event == 0x0c23) {
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alt[1] = event ^ (0x0c13 ^ 0x0c23);
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return 2;
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}
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/* several possibilities for PM_INST_CMPL */
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for (i = 0; i < ARRAY_SIZE(ppc_inst_cmpl); ++i) {
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if (event == ppc_inst_cmpl[i]) {
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for (j = 0; j < ARRAY_SIZE(ppc_inst_cmpl); ++j)
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if (j != i)
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alt[na++] = ppc_inst_cmpl[j];
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break;
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}
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}
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return na;
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}
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static int p4_compute_mmcr(u64 event[], int n_ev,
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unsigned int hwc[], u64 mmcr[])
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{
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u64 mmcr0 = 0, mmcr1 = 0, mmcra = 0;
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unsigned int pmc, unit, byte, psel, lower;
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unsigned int ttm, grp;
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unsigned int pmc_inuse = 0;
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unsigned int pmc_grp_use[2];
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unsigned char busbyte[4];
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unsigned char unituse[16];
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unsigned int unitlower = 0;
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int i;
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if (n_ev > 8)
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return -1;
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/* First pass to count resource use */
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pmc_grp_use[0] = pmc_grp_use[1] = 0;
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memset(busbyte, 0, sizeof(busbyte));
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memset(unituse, 0, sizeof(unituse));
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for (i = 0; i < n_ev; ++i) {
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pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
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if (pmc) {
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if (pmc_inuse & (1 << (pmc - 1)))
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return -1;
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pmc_inuse |= 1 << (pmc - 1);
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/* count 1/2/5/6 vs 3/4/7/8 use */
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++pmc_grp_use[((pmc - 1) >> 1) & 1];
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}
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unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
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byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
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lower = (event[i] >> PM_LOWER_SH) & PM_LOWER_MSK;
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if (unit) {
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if (!pmc)
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++pmc_grp_use[byte & 1];
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if (unit == 6 || unit == 8)
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/* map alt ISU1/IFU codes: 6->2, 8->3 */
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unit = (unit >> 1) - 1;
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if (busbyte[byte] && busbyte[byte] != unit)
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return -1;
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busbyte[byte] = unit;
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lower <<= unit;
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if (unituse[unit] && lower != (unitlower & lower))
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return -1;
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unituse[unit] = 1;
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unitlower |= lower;
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}
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}
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if (pmc_grp_use[0] > 4 || pmc_grp_use[1] > 4)
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return -1;
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/*
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* Assign resources and set multiplexer selects.
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*
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* Units 1,2,3 are on TTM0, 4,6,7 on TTM1, 8,10 on TTM2.
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* Each TTMx can only select one unit, but since
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* units 2 and 6 are both ISU1, and 3 and 8 are both IFU,
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* we have some choices.
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*/
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if (unituse[2] & (unituse[1] | (unituse[3] & unituse[9]))) {
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unituse[6] = 1; /* Move 2 to 6 */
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unituse[2] = 0;
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}
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if (unituse[3] & (unituse[1] | unituse[2])) {
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unituse[8] = 1; /* Move 3 to 8 */
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unituse[3] = 0;
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unitlower = (unitlower & ~8) | ((unitlower & 8) << 5);
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}
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/* Check only one unit per TTMx */
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if (unituse[1] + unituse[2] + unituse[3] > 1 ||
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unituse[4] + unituse[6] + unituse[7] > 1 ||
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unituse[8] + unituse[9] > 1 ||
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(unituse[5] | unituse[10] | unituse[11] |
|
|
unituse[13] | unituse[14]))
|
|
return -1;
|
|
|
|
/* Set TTMxSEL fields. Note, units 1-3 => TTM0SEL codes 0-2 */
|
|
mmcr1 |= (u64)(unituse[3] * 2 + unituse[2]) << MMCR1_TTM0SEL_SH;
|
|
mmcr1 |= (u64)(unituse[7] * 3 + unituse[6] * 2) << MMCR1_TTM1SEL_SH;
|
|
mmcr1 |= (u64)unituse[9] << MMCR1_TTM2SEL_SH;
|
|
|
|
/* Set TTCxSEL fields. */
|
|
if (unitlower & 0xe)
|
|
mmcr1 |= 1ull << MMCR1_TTC0SEL_SH;
|
|
if (unitlower & 0xf0)
|
|
mmcr1 |= 1ull << MMCR1_TTC1SEL_SH;
|
|
if (unitlower & 0xf00)
|
|
mmcr1 |= 1ull << MMCR1_TTC2SEL_SH;
|
|
if (unitlower & 0x7000)
|
|
mmcr1 |= 1ull << MMCR1_TTC3SEL_SH;
|
|
|
|
/* Set byte lane select fields. */
|
|
for (byte = 0; byte < 4; ++byte) {
|
|
unit = busbyte[byte];
|
|
if (!unit)
|
|
continue;
|
|
if (unit == 0xf) {
|
|
/* special case for GPS */
|
|
mmcr1 |= 1ull << (MMCR1_DEBUG0SEL_SH - byte);
|
|
} else {
|
|
if (!unituse[unit])
|
|
ttm = unit - 1; /* 2->1, 3->2 */
|
|
else
|
|
ttm = unit >> 2;
|
|
mmcr1 |= (u64)ttm << (MMCR1_TD_CP_DBG0SEL_SH - 2*byte);
|
|
}
|
|
}
|
|
|
|
/* Second pass: assign PMCs, set PMCxSEL and PMCx_ADDER_SEL fields */
|
|
for (i = 0; i < n_ev; ++i) {
|
|
pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
|
|
unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
|
|
byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
|
|
psel = event[i] & PM_PMCSEL_MSK;
|
|
if (!pmc) {
|
|
/* Bus event or 00xxx direct event (off or cycles) */
|
|
if (unit)
|
|
psel |= 0x10 | ((byte & 2) << 2);
|
|
for (pmc = 0; pmc < 8; ++pmc) {
|
|
if (pmc_inuse & (1 << pmc))
|
|
continue;
|
|
grp = (pmc >> 1) & 1;
|
|
if (unit) {
|
|
if (grp == (byte & 1))
|
|
break;
|
|
} else if (pmc_grp_use[grp] < 4) {
|
|
++pmc_grp_use[grp];
|
|
break;
|
|
}
|
|
}
|
|
pmc_inuse |= 1 << pmc;
|
|
} else {
|
|
/* Direct event */
|
|
--pmc;
|
|
if (psel == 0 && (byte & 2))
|
|
/* add events on higher-numbered bus */
|
|
mmcr1 |= 1ull << mmcr1_adder_bits[pmc];
|
|
else if (psel == 6 && byte == 3)
|
|
/* seem to need to set sample_enable here */
|
|
mmcra |= MMCRA_SAMPLE_ENABLE;
|
|
psel |= 8;
|
|
}
|
|
if (pmc <= 1)
|
|
mmcr0 |= psel << (MMCR0_PMC1SEL_SH - 7 * pmc);
|
|
else
|
|
mmcr1 |= psel << (MMCR1_PMC3SEL_SH - 5 * (pmc - 2));
|
|
if (pmc == 7) /* PMC8 */
|
|
mmcra |= (psel & 1) << MMCRA_PMC8SEL0_SH;
|
|
hwc[i] = pmc;
|
|
if (p4_marked_instr_event(event[i]))
|
|
mmcra |= MMCRA_SAMPLE_ENABLE;
|
|
}
|
|
|
|
if (pmc_inuse & 1)
|
|
mmcr0 |= MMCR0_PMC1CE;
|
|
if (pmc_inuse & 0xfe)
|
|
mmcr0 |= MMCR0_PMCjCE;
|
|
|
|
mmcra |= 0x2000; /* mark only one IOP per PPC instruction */
|
|
|
|
/* Return MMCRx values */
|
|
mmcr[0] = mmcr0;
|
|
mmcr[1] = mmcr1;
|
|
mmcr[2] = mmcra;
|
|
return 0;
|
|
}
|
|
|
|
static void p4_disable_pmc(unsigned int pmc, u64 mmcr[])
|
|
{
|
|
/*
|
|
* Setting the PMCxSEL field to 0 disables PMC x.
|
|
* (Note that pmc is 0-based here, not 1-based.)
|
|
*/
|
|
if (pmc <= 1) {
|
|
mmcr[0] &= ~(0x1fUL << (MMCR0_PMC1SEL_SH - 7 * pmc));
|
|
} else {
|
|
mmcr[1] &= ~(0x1fUL << (MMCR1_PMC3SEL_SH - 5 * (pmc - 2)));
|
|
if (pmc == 7)
|
|
mmcr[2] &= ~(1UL << MMCRA_PMC8SEL0_SH);
|
|
}
|
|
}
|
|
|
|
static int p4_generic_events[] = {
|
|
[PERF_COUNT_CPU_CYCLES] = 7,
|
|
[PERF_COUNT_INSTRUCTIONS] = 0x1001,
|
|
[PERF_COUNT_CACHE_REFERENCES] = 0x8c10, /* PM_LD_REF_L1 */
|
|
[PERF_COUNT_CACHE_MISSES] = 0x3c10, /* PM_LD_MISS_L1 */
|
|
[PERF_COUNT_BRANCH_INSTRUCTIONS] = 0x330, /* PM_BR_ISSUED */
|
|
[PERF_COUNT_BRANCH_MISSES] = 0x331, /* PM_BR_MPRED_CR */
|
|
};
|
|
|
|
struct power_pmu power4_pmu = {
|
|
.n_counter = 8,
|
|
.max_alternatives = 5,
|
|
.add_fields = 0x0000001100005555ull,
|
|
.test_adder = 0x0011083300000000ull,
|
|
.compute_mmcr = p4_compute_mmcr,
|
|
.get_constraint = p4_get_constraint,
|
|
.get_alternatives = p4_get_alternatives,
|
|
.disable_pmc = p4_disable_pmc,
|
|
.n_generic = ARRAY_SIZE(p4_generic_events),
|
|
.generic_events = p4_generic_events,
|
|
};
|