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9d2dcc8fc6
It is useful to get the running time of a thread. Doing so in an
efficient manner can be important for performance of user applications.
Avoiding system calls in `clock_gettime` when handling
CLOCK_THREAD_CPUTIME_ID is important. Other clocks are handled in the
VDSO, but CLOCK_THREAD_CPUTIME_ID falls back on the system call.
CLOCK_THREAD_CPUTIME_ID is not handled in the VDSO since it would have
costs associated with maintaining updated user space accessible time
offsets. These offsets have to be updated everytime the a thread is
scheduled/descheduled. However, for programs regularly checking the
running time of a thread, this is a performance improvement.
This patch takes a middle ground, and adds support for cap_user_time an
optional feature of the perf_event API. This way costs are only
incurred when the perf_event api is enabled. This is done the same way
as it is in x86.
Ultimately this allows calculating the thread running time in userspace
on aarch64 as follows (adapted from perf_event_open manpage):
u32 seq, time_mult, time_shift;
u64 running, count, time_offset, quot, rem, delta;
struct perf_event_mmap_page *pc;
pc = buf; // buf is the perf event mmaped page as documented in the API.
if (pc->cap_usr_time) {
do {
seq = pc->lock;
barrier();
running = pc->time_running;
count = readCNTVCT_EL0(); // Read ARM hardware clock.
time_offset = pc->time_offset;
time_mult = pc->time_mult;
time_shift = pc->time_shift;
barrier();
} while (pc->lock != seq);
quot = (count >> time_shift);
rem = count & (((u64)1 << time_shift) - 1);
delta = time_offset + quot * time_mult +
((rem * time_mult) >> time_shift);
running += delta;
// running now has the current nanosecond level thread time.
}
Summary of changes in the patch:
For aarch64 systems, make arch_perf_update_userpage update the timing
information stored in the perf_event page. Requiring the following
calculations:
- Calculate the appropriate time_mult, and time_shift factors to convert
ticks to nano seconds for the current clock frequency.
- Adjust the mult and shift factors to avoid shift factors of 32 bits.
(possibly unnecessary)
- The time_offset userspace should apply when doing calculations:
negative the current sched time (now), because time_running and
time_enabled fields of the perf_event page have just been updated.
Toggle bits to appropriate values:
- Enable cap_user_time
Signed-off-by: Michael O'Farrell <micpof@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
1311 lines
41 KiB
C
1311 lines
41 KiB
C
/*
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* PMU support
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*
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* Copyright (C) 2012 ARM Limited
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* Author: Will Deacon <will.deacon@arm.com>
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*
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* This code is based heavily on the ARMv7 perf event code.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <asm/irq_regs.h>
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#include <asm/perf_event.h>
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#include <asm/sysreg.h>
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#include <asm/virt.h>
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#include <linux/acpi.h>
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#include <linux/clocksource.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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/*
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* ARMv8 PMUv3 Performance Events handling code.
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* Common event types (some are defined in asm/perf_event.h).
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*/
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/* At least one of the following is required. */
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#define ARMV8_PMUV3_PERFCTR_INST_RETIRED 0x08
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#define ARMV8_PMUV3_PERFCTR_INST_SPEC 0x1B
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/* Common architectural events. */
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#define ARMV8_PMUV3_PERFCTR_LD_RETIRED 0x06
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#define ARMV8_PMUV3_PERFCTR_ST_RETIRED 0x07
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#define ARMV8_PMUV3_PERFCTR_EXC_TAKEN 0x09
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#define ARMV8_PMUV3_PERFCTR_EXC_RETURN 0x0A
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#define ARMV8_PMUV3_PERFCTR_CID_WRITE_RETIRED 0x0B
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#define ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED 0x0C
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#define ARMV8_PMUV3_PERFCTR_BR_IMMED_RETIRED 0x0D
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#define ARMV8_PMUV3_PERFCTR_BR_RETURN_RETIRED 0x0E
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#define ARMV8_PMUV3_PERFCTR_UNALIGNED_LDST_RETIRED 0x0F
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#define ARMV8_PMUV3_PERFCTR_TTBR_WRITE_RETIRED 0x1C
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#define ARMV8_PMUV3_PERFCTR_CHAIN 0x1E
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#define ARMV8_PMUV3_PERFCTR_BR_RETIRED 0x21
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/* Common microarchitectural events. */
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#define ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL 0x01
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#define ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL 0x02
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#define ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL 0x05
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#define ARMV8_PMUV3_PERFCTR_MEM_ACCESS 0x13
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#define ARMV8_PMUV3_PERFCTR_L1I_CACHE 0x14
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#define ARMV8_PMUV3_PERFCTR_L1D_CACHE_WB 0x15
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#define ARMV8_PMUV3_PERFCTR_L2D_CACHE 0x16
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#define ARMV8_PMUV3_PERFCTR_L2D_CACHE_REFILL 0x17
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#define ARMV8_PMUV3_PERFCTR_L2D_CACHE_WB 0x18
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#define ARMV8_PMUV3_PERFCTR_BUS_ACCESS 0x19
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#define ARMV8_PMUV3_PERFCTR_MEMORY_ERROR 0x1A
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#define ARMV8_PMUV3_PERFCTR_BUS_CYCLES 0x1D
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#define ARMV8_PMUV3_PERFCTR_L1D_CACHE_ALLOCATE 0x1F
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#define ARMV8_PMUV3_PERFCTR_L2D_CACHE_ALLOCATE 0x20
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#define ARMV8_PMUV3_PERFCTR_BR_MIS_PRED_RETIRED 0x22
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#define ARMV8_PMUV3_PERFCTR_STALL_FRONTEND 0x23
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#define ARMV8_PMUV3_PERFCTR_STALL_BACKEND 0x24
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#define ARMV8_PMUV3_PERFCTR_L1D_TLB 0x25
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#define ARMV8_PMUV3_PERFCTR_L1I_TLB 0x26
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#define ARMV8_PMUV3_PERFCTR_L2I_CACHE 0x27
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#define ARMV8_PMUV3_PERFCTR_L2I_CACHE_REFILL 0x28
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#define ARMV8_PMUV3_PERFCTR_L3D_CACHE_ALLOCATE 0x29
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#define ARMV8_PMUV3_PERFCTR_L3D_CACHE_REFILL 0x2A
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#define ARMV8_PMUV3_PERFCTR_L3D_CACHE 0x2B
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#define ARMV8_PMUV3_PERFCTR_L3D_CACHE_WB 0x2C
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#define ARMV8_PMUV3_PERFCTR_L2D_TLB_REFILL 0x2D
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#define ARMV8_PMUV3_PERFCTR_L2I_TLB_REFILL 0x2E
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#define ARMV8_PMUV3_PERFCTR_L2D_TLB 0x2F
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#define ARMV8_PMUV3_PERFCTR_L2I_TLB 0x30
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/* ARMv8 recommended implementation defined event types */
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD 0x40
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR 0x41
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD 0x42
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR 0x43
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_INNER 0x44
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_OUTER 0x45
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WB_VICTIM 0x46
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WB_CLEAN 0x47
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#define ARMV8_IMPDEF_PERFCTR_L1D_CACHE_INVAL 0x48
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#define ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD 0x4C
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#define ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR 0x4D
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#define ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD 0x4E
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#define ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR 0x4F
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#define ARMV8_IMPDEF_PERFCTR_L2D_CACHE_RD 0x50
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#define ARMV8_IMPDEF_PERFCTR_L2D_CACHE_WR 0x51
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#define ARMV8_IMPDEF_PERFCTR_L2D_CACHE_REFILL_RD 0x52
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#define ARMV8_IMPDEF_PERFCTR_L2D_CACHE_REFILL_WR 0x53
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#define ARMV8_IMPDEF_PERFCTR_L2D_CACHE_WB_VICTIM 0x56
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#define ARMV8_IMPDEF_PERFCTR_L2D_CACHE_WB_CLEAN 0x57
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#define ARMV8_IMPDEF_PERFCTR_L2D_CACHE_INVAL 0x58
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#define ARMV8_IMPDEF_PERFCTR_L2D_TLB_REFILL_RD 0x5C
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#define ARMV8_IMPDEF_PERFCTR_L2D_TLB_REFILL_WR 0x5D
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#define ARMV8_IMPDEF_PERFCTR_L2D_TLB_RD 0x5E
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#define ARMV8_IMPDEF_PERFCTR_L2D_TLB_WR 0x5F
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#define ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD 0x60
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#define ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR 0x61
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#define ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_SHARED 0x62
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#define ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_NOT_SHARED 0x63
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#define ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_NORMAL 0x64
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#define ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_PERIPH 0x65
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#define ARMV8_IMPDEF_PERFCTR_MEM_ACCESS_RD 0x66
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#define ARMV8_IMPDEF_PERFCTR_MEM_ACCESS_WR 0x67
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#define ARMV8_IMPDEF_PERFCTR_UNALIGNED_LD_SPEC 0x68
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#define ARMV8_IMPDEF_PERFCTR_UNALIGNED_ST_SPEC 0x69
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#define ARMV8_IMPDEF_PERFCTR_UNALIGNED_LDST_SPEC 0x6A
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#define ARMV8_IMPDEF_PERFCTR_LDREX_SPEC 0x6C
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#define ARMV8_IMPDEF_PERFCTR_STREX_PASS_SPEC 0x6D
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#define ARMV8_IMPDEF_PERFCTR_STREX_FAIL_SPEC 0x6E
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#define ARMV8_IMPDEF_PERFCTR_STREX_SPEC 0x6F
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#define ARMV8_IMPDEF_PERFCTR_LD_SPEC 0x70
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#define ARMV8_IMPDEF_PERFCTR_ST_SPEC 0x71
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#define ARMV8_IMPDEF_PERFCTR_LDST_SPEC 0x72
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#define ARMV8_IMPDEF_PERFCTR_DP_SPEC 0x73
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#define ARMV8_IMPDEF_PERFCTR_ASE_SPEC 0x74
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#define ARMV8_IMPDEF_PERFCTR_VFP_SPEC 0x75
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#define ARMV8_IMPDEF_PERFCTR_PC_WRITE_SPEC 0x76
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#define ARMV8_IMPDEF_PERFCTR_CRYPTO_SPEC 0x77
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#define ARMV8_IMPDEF_PERFCTR_BR_IMMED_SPEC 0x78
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#define ARMV8_IMPDEF_PERFCTR_BR_RETURN_SPEC 0x79
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#define ARMV8_IMPDEF_PERFCTR_BR_INDIRECT_SPEC 0x7A
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#define ARMV8_IMPDEF_PERFCTR_ISB_SPEC 0x7C
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#define ARMV8_IMPDEF_PERFCTR_DSB_SPEC 0x7D
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#define ARMV8_IMPDEF_PERFCTR_DMB_SPEC 0x7E
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#define ARMV8_IMPDEF_PERFCTR_EXC_UNDEF 0x81
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#define ARMV8_IMPDEF_PERFCTR_EXC_SVC 0x82
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#define ARMV8_IMPDEF_PERFCTR_EXC_PABORT 0x83
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#define ARMV8_IMPDEF_PERFCTR_EXC_DABORT 0x84
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#define ARMV8_IMPDEF_PERFCTR_EXC_IRQ 0x86
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#define ARMV8_IMPDEF_PERFCTR_EXC_FIQ 0x87
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#define ARMV8_IMPDEF_PERFCTR_EXC_SMC 0x88
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#define ARMV8_IMPDEF_PERFCTR_EXC_HVC 0x8A
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#define ARMV8_IMPDEF_PERFCTR_EXC_TRAP_PABORT 0x8B
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#define ARMV8_IMPDEF_PERFCTR_EXC_TRAP_DABORT 0x8C
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#define ARMV8_IMPDEF_PERFCTR_EXC_TRAP_OTHER 0x8D
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#define ARMV8_IMPDEF_PERFCTR_EXC_TRAP_IRQ 0x8E
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#define ARMV8_IMPDEF_PERFCTR_EXC_TRAP_FIQ 0x8F
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#define ARMV8_IMPDEF_PERFCTR_RC_LD_SPEC 0x90
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#define ARMV8_IMPDEF_PERFCTR_RC_ST_SPEC 0x91
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#define ARMV8_IMPDEF_PERFCTR_L3D_CACHE_RD 0xA0
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#define ARMV8_IMPDEF_PERFCTR_L3D_CACHE_WR 0xA1
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#define ARMV8_IMPDEF_PERFCTR_L3D_CACHE_REFILL_RD 0xA2
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#define ARMV8_IMPDEF_PERFCTR_L3D_CACHE_REFILL_WR 0xA3
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#define ARMV8_IMPDEF_PERFCTR_L3D_CACHE_WB_VICTIM 0xA6
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#define ARMV8_IMPDEF_PERFCTR_L3D_CACHE_WB_CLEAN 0xA7
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#define ARMV8_IMPDEF_PERFCTR_L3D_CACHE_INVAL 0xA8
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/* ARMv8 Cortex-A53 specific event types. */
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#define ARMV8_A53_PERFCTR_PREF_LINEFILL 0xC2
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/* ARMv8 Cavium ThunderX specific event types. */
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#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_MISS_ST 0xE9
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#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_ACCESS 0xEA
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#define ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_MISS 0xEB
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#define ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_ACCESS 0xEC
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#define ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_MISS 0xED
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/* PMUv3 HW events mapping. */
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/*
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* ARMv8 Architectural defined events, not all of these may
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* be supported on any given implementation. Undefined events will
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* be disabled at run-time.
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*/
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static const unsigned armv8_pmuv3_perf_map[PERF_COUNT_HW_MAX] = {
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PERF_MAP_ALL_UNSUPPORTED,
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[PERF_COUNT_HW_CPU_CYCLES] = ARMV8_PMUV3_PERFCTR_CPU_CYCLES,
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[PERF_COUNT_HW_INSTRUCTIONS] = ARMV8_PMUV3_PERFCTR_INST_RETIRED,
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[PERF_COUNT_HW_CACHE_REFERENCES] = ARMV8_PMUV3_PERFCTR_L1D_CACHE,
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[PERF_COUNT_HW_CACHE_MISSES] = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL,
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED,
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[PERF_COUNT_HW_BRANCH_MISSES] = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED,
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[PERF_COUNT_HW_BUS_CYCLES] = ARMV8_PMUV3_PERFCTR_BUS_CYCLES,
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[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV8_PMUV3_PERFCTR_STALL_FRONTEND,
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[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = ARMV8_PMUV3_PERFCTR_STALL_BACKEND,
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};
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static const unsigned armv8_pmuv3_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)] = ARMV8_PMUV3_PERFCTR_L1D_CACHE,
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[C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL,
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[C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1D_CACHE,
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[C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL,
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[C(L1I)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1I_CACHE,
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[C(L1I)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL,
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[C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL,
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[C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1D_TLB,
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[C(ITLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL,
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[C(ITLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1I_TLB,
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[C(BPU)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_BR_PRED,
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[C(BPU)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED,
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[C(BPU)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_BR_PRED,
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[C(BPU)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_PMUV3_PERFCTR_BR_MIS_PRED,
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};
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static const unsigned armv8_a53_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_PREFETCH)][C(RESULT_MISS)] = ARMV8_A53_PERFCTR_PREF_LINEFILL,
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[C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
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[C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
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};
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static const unsigned armv8_a57_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)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
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[C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
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[C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
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[C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR,
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[C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
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[C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,
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[C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
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[C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
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};
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static const unsigned armv8_a73_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)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
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[C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
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};
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static const unsigned armv8_thunder_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
|
|
[PERF_COUNT_HW_CACHE_OP_MAX]
|
|
[PERF_COUNT_HW_CACHE_RESULT_MAX] = {
|
|
PERF_CACHE_MAP_ALL_UNSUPPORTED,
|
|
|
|
[C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
|
|
[C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
|
|
[C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
|
|
[C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_MISS_ST,
|
|
[C(L1D)][C(OP_PREFETCH)][C(RESULT_ACCESS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_ACCESS,
|
|
[C(L1D)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1D_CACHE_PREF_MISS,
|
|
|
|
[C(L1I)][C(OP_PREFETCH)][C(RESULT_ACCESS)] = ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_ACCESS,
|
|
[C(L1I)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_THUNDER_PERFCTR_L1I_CACHE_PREF_MISS,
|
|
|
|
[C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD,
|
|
[C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
|
|
[C(DTLB)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR,
|
|
[C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,
|
|
};
|
|
|
|
static const unsigned armv8_vulcan_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
|
|
[PERF_COUNT_HW_CACHE_OP_MAX]
|
|
[PERF_COUNT_HW_CACHE_RESULT_MAX] = {
|
|
PERF_CACHE_MAP_ALL_UNSUPPORTED,
|
|
|
|
[C(L1D)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
|
|
[C(L1D)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
|
|
[C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
|
|
[C(L1D)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR,
|
|
|
|
[C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_RD,
|
|
[C(DTLB)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_WR,
|
|
[C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_RD,
|
|
[C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV8_IMPDEF_PERFCTR_L1D_TLB_REFILL_WR,
|
|
|
|
[C(NODE)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
|
|
[C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
|
|
};
|
|
|
|
static ssize_t
|
|
armv8pmu_events_sysfs_show(struct device *dev,
|
|
struct device_attribute *attr, char *page)
|
|
{
|
|
struct perf_pmu_events_attr *pmu_attr;
|
|
|
|
pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
|
|
|
|
return sprintf(page, "event=0x%03llx\n", pmu_attr->id);
|
|
}
|
|
|
|
#define ARMV8_EVENT_ATTR_RESOLVE(m) #m
|
|
#define ARMV8_EVENT_ATTR(name, config) \
|
|
PMU_EVENT_ATTR(name, armv8_event_attr_##name, \
|
|
config, armv8pmu_events_sysfs_show)
|
|
|
|
ARMV8_EVENT_ATTR(sw_incr, ARMV8_PMUV3_PERFCTR_SW_INCR);
|
|
ARMV8_EVENT_ATTR(l1i_cache_refill, ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL);
|
|
ARMV8_EVENT_ATTR(l1i_tlb_refill, ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL);
|
|
ARMV8_EVENT_ATTR(l1d_cache_refill, ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL);
|
|
ARMV8_EVENT_ATTR(l1d_cache, ARMV8_PMUV3_PERFCTR_L1D_CACHE);
|
|
ARMV8_EVENT_ATTR(l1d_tlb_refill, ARMV8_PMUV3_PERFCTR_L1D_TLB_REFILL);
|
|
ARMV8_EVENT_ATTR(ld_retired, ARMV8_PMUV3_PERFCTR_LD_RETIRED);
|
|
ARMV8_EVENT_ATTR(st_retired, ARMV8_PMUV3_PERFCTR_ST_RETIRED);
|
|
ARMV8_EVENT_ATTR(inst_retired, ARMV8_PMUV3_PERFCTR_INST_RETIRED);
|
|
ARMV8_EVENT_ATTR(exc_taken, ARMV8_PMUV3_PERFCTR_EXC_TAKEN);
|
|
ARMV8_EVENT_ATTR(exc_return, ARMV8_PMUV3_PERFCTR_EXC_RETURN);
|
|
ARMV8_EVENT_ATTR(cid_write_retired, ARMV8_PMUV3_PERFCTR_CID_WRITE_RETIRED);
|
|
ARMV8_EVENT_ATTR(pc_write_retired, ARMV8_PMUV3_PERFCTR_PC_WRITE_RETIRED);
|
|
ARMV8_EVENT_ATTR(br_immed_retired, ARMV8_PMUV3_PERFCTR_BR_IMMED_RETIRED);
|
|
ARMV8_EVENT_ATTR(br_return_retired, ARMV8_PMUV3_PERFCTR_BR_RETURN_RETIRED);
|
|
ARMV8_EVENT_ATTR(unaligned_ldst_retired, ARMV8_PMUV3_PERFCTR_UNALIGNED_LDST_RETIRED);
|
|
ARMV8_EVENT_ATTR(br_mis_pred, ARMV8_PMUV3_PERFCTR_BR_MIS_PRED);
|
|
ARMV8_EVENT_ATTR(cpu_cycles, ARMV8_PMUV3_PERFCTR_CPU_CYCLES);
|
|
ARMV8_EVENT_ATTR(br_pred, ARMV8_PMUV3_PERFCTR_BR_PRED);
|
|
ARMV8_EVENT_ATTR(mem_access, ARMV8_PMUV3_PERFCTR_MEM_ACCESS);
|
|
ARMV8_EVENT_ATTR(l1i_cache, ARMV8_PMUV3_PERFCTR_L1I_CACHE);
|
|
ARMV8_EVENT_ATTR(l1d_cache_wb, ARMV8_PMUV3_PERFCTR_L1D_CACHE_WB);
|
|
ARMV8_EVENT_ATTR(l2d_cache, ARMV8_PMUV3_PERFCTR_L2D_CACHE);
|
|
ARMV8_EVENT_ATTR(l2d_cache_refill, ARMV8_PMUV3_PERFCTR_L2D_CACHE_REFILL);
|
|
ARMV8_EVENT_ATTR(l2d_cache_wb, ARMV8_PMUV3_PERFCTR_L2D_CACHE_WB);
|
|
ARMV8_EVENT_ATTR(bus_access, ARMV8_PMUV3_PERFCTR_BUS_ACCESS);
|
|
ARMV8_EVENT_ATTR(memory_error, ARMV8_PMUV3_PERFCTR_MEMORY_ERROR);
|
|
ARMV8_EVENT_ATTR(inst_spec, ARMV8_PMUV3_PERFCTR_INST_SPEC);
|
|
ARMV8_EVENT_ATTR(ttbr_write_retired, ARMV8_PMUV3_PERFCTR_TTBR_WRITE_RETIRED);
|
|
ARMV8_EVENT_ATTR(bus_cycles, ARMV8_PMUV3_PERFCTR_BUS_CYCLES);
|
|
/* Don't expose the chain event in /sys, since it's useless in isolation */
|
|
ARMV8_EVENT_ATTR(l1d_cache_allocate, ARMV8_PMUV3_PERFCTR_L1D_CACHE_ALLOCATE);
|
|
ARMV8_EVENT_ATTR(l2d_cache_allocate, ARMV8_PMUV3_PERFCTR_L2D_CACHE_ALLOCATE);
|
|
ARMV8_EVENT_ATTR(br_retired, ARMV8_PMUV3_PERFCTR_BR_RETIRED);
|
|
ARMV8_EVENT_ATTR(br_mis_pred_retired, ARMV8_PMUV3_PERFCTR_BR_MIS_PRED_RETIRED);
|
|
ARMV8_EVENT_ATTR(stall_frontend, ARMV8_PMUV3_PERFCTR_STALL_FRONTEND);
|
|
ARMV8_EVENT_ATTR(stall_backend, ARMV8_PMUV3_PERFCTR_STALL_BACKEND);
|
|
ARMV8_EVENT_ATTR(l1d_tlb, ARMV8_PMUV3_PERFCTR_L1D_TLB);
|
|
ARMV8_EVENT_ATTR(l1i_tlb, ARMV8_PMUV3_PERFCTR_L1I_TLB);
|
|
ARMV8_EVENT_ATTR(l2i_cache, ARMV8_PMUV3_PERFCTR_L2I_CACHE);
|
|
ARMV8_EVENT_ATTR(l2i_cache_refill, ARMV8_PMUV3_PERFCTR_L2I_CACHE_REFILL);
|
|
ARMV8_EVENT_ATTR(l3d_cache_allocate, ARMV8_PMUV3_PERFCTR_L3D_CACHE_ALLOCATE);
|
|
ARMV8_EVENT_ATTR(l3d_cache_refill, ARMV8_PMUV3_PERFCTR_L3D_CACHE_REFILL);
|
|
ARMV8_EVENT_ATTR(l3d_cache, ARMV8_PMUV3_PERFCTR_L3D_CACHE);
|
|
ARMV8_EVENT_ATTR(l3d_cache_wb, ARMV8_PMUV3_PERFCTR_L3D_CACHE_WB);
|
|
ARMV8_EVENT_ATTR(l2d_tlb_refill, ARMV8_PMUV3_PERFCTR_L2D_TLB_REFILL);
|
|
ARMV8_EVENT_ATTR(l2i_tlb_refill, ARMV8_PMUV3_PERFCTR_L2I_TLB_REFILL);
|
|
ARMV8_EVENT_ATTR(l2d_tlb, ARMV8_PMUV3_PERFCTR_L2D_TLB);
|
|
ARMV8_EVENT_ATTR(l2i_tlb, ARMV8_PMUV3_PERFCTR_L2I_TLB);
|
|
|
|
static struct attribute *armv8_pmuv3_event_attrs[] = {
|
|
&armv8_event_attr_sw_incr.attr.attr,
|
|
&armv8_event_attr_l1i_cache_refill.attr.attr,
|
|
&armv8_event_attr_l1i_tlb_refill.attr.attr,
|
|
&armv8_event_attr_l1d_cache_refill.attr.attr,
|
|
&armv8_event_attr_l1d_cache.attr.attr,
|
|
&armv8_event_attr_l1d_tlb_refill.attr.attr,
|
|
&armv8_event_attr_ld_retired.attr.attr,
|
|
&armv8_event_attr_st_retired.attr.attr,
|
|
&armv8_event_attr_inst_retired.attr.attr,
|
|
&armv8_event_attr_exc_taken.attr.attr,
|
|
&armv8_event_attr_exc_return.attr.attr,
|
|
&armv8_event_attr_cid_write_retired.attr.attr,
|
|
&armv8_event_attr_pc_write_retired.attr.attr,
|
|
&armv8_event_attr_br_immed_retired.attr.attr,
|
|
&armv8_event_attr_br_return_retired.attr.attr,
|
|
&armv8_event_attr_unaligned_ldst_retired.attr.attr,
|
|
&armv8_event_attr_br_mis_pred.attr.attr,
|
|
&armv8_event_attr_cpu_cycles.attr.attr,
|
|
&armv8_event_attr_br_pred.attr.attr,
|
|
&armv8_event_attr_mem_access.attr.attr,
|
|
&armv8_event_attr_l1i_cache.attr.attr,
|
|
&armv8_event_attr_l1d_cache_wb.attr.attr,
|
|
&armv8_event_attr_l2d_cache.attr.attr,
|
|
&armv8_event_attr_l2d_cache_refill.attr.attr,
|
|
&armv8_event_attr_l2d_cache_wb.attr.attr,
|
|
&armv8_event_attr_bus_access.attr.attr,
|
|
&armv8_event_attr_memory_error.attr.attr,
|
|
&armv8_event_attr_inst_spec.attr.attr,
|
|
&armv8_event_attr_ttbr_write_retired.attr.attr,
|
|
&armv8_event_attr_bus_cycles.attr.attr,
|
|
&armv8_event_attr_l1d_cache_allocate.attr.attr,
|
|
&armv8_event_attr_l2d_cache_allocate.attr.attr,
|
|
&armv8_event_attr_br_retired.attr.attr,
|
|
&armv8_event_attr_br_mis_pred_retired.attr.attr,
|
|
&armv8_event_attr_stall_frontend.attr.attr,
|
|
&armv8_event_attr_stall_backend.attr.attr,
|
|
&armv8_event_attr_l1d_tlb.attr.attr,
|
|
&armv8_event_attr_l1i_tlb.attr.attr,
|
|
&armv8_event_attr_l2i_cache.attr.attr,
|
|
&armv8_event_attr_l2i_cache_refill.attr.attr,
|
|
&armv8_event_attr_l3d_cache_allocate.attr.attr,
|
|
&armv8_event_attr_l3d_cache_refill.attr.attr,
|
|
&armv8_event_attr_l3d_cache.attr.attr,
|
|
&armv8_event_attr_l3d_cache_wb.attr.attr,
|
|
&armv8_event_attr_l2d_tlb_refill.attr.attr,
|
|
&armv8_event_attr_l2i_tlb_refill.attr.attr,
|
|
&armv8_event_attr_l2d_tlb.attr.attr,
|
|
&armv8_event_attr_l2i_tlb.attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t
|
|
armv8pmu_event_attr_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int unused)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct pmu *pmu = dev_get_drvdata(dev);
|
|
struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
|
|
struct perf_pmu_events_attr *pmu_attr;
|
|
|
|
pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr);
|
|
|
|
if (test_bit(pmu_attr->id, cpu_pmu->pmceid_bitmap))
|
|
return attr->mode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct attribute_group armv8_pmuv3_events_attr_group = {
|
|
.name = "events",
|
|
.attrs = armv8_pmuv3_event_attrs,
|
|
.is_visible = armv8pmu_event_attr_is_visible,
|
|
};
|
|
|
|
PMU_FORMAT_ATTR(event, "config:0-15");
|
|
PMU_FORMAT_ATTR(long, "config1:0");
|
|
|
|
static inline bool armv8pmu_event_is_64bit(struct perf_event *event)
|
|
{
|
|
return event->attr.config1 & 0x1;
|
|
}
|
|
|
|
static struct attribute *armv8_pmuv3_format_attrs[] = {
|
|
&format_attr_event.attr,
|
|
&format_attr_long.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group armv8_pmuv3_format_attr_group = {
|
|
.name = "format",
|
|
.attrs = armv8_pmuv3_format_attrs,
|
|
};
|
|
|
|
/*
|
|
* Perf Events' indices
|
|
*/
|
|
#define ARMV8_IDX_CYCLE_COUNTER 0
|
|
#define ARMV8_IDX_COUNTER0 1
|
|
#define ARMV8_IDX_COUNTER_LAST(cpu_pmu) \
|
|
(ARMV8_IDX_CYCLE_COUNTER + cpu_pmu->num_events - 1)
|
|
|
|
/*
|
|
* We must chain two programmable counters for 64 bit events,
|
|
* except when we have allocated the 64bit cycle counter (for CPU
|
|
* cycles event). This must be called only when the event has
|
|
* a counter allocated.
|
|
*/
|
|
static inline bool armv8pmu_event_is_chained(struct perf_event *event)
|
|
{
|
|
int idx = event->hw.idx;
|
|
|
|
return !WARN_ON(idx < 0) &&
|
|
armv8pmu_event_is_64bit(event) &&
|
|
(idx != ARMV8_IDX_CYCLE_COUNTER);
|
|
}
|
|
|
|
/*
|
|
* ARMv8 low level PMU access
|
|
*/
|
|
|
|
/*
|
|
* Perf Event to low level counters mapping
|
|
*/
|
|
#define ARMV8_IDX_TO_COUNTER(x) \
|
|
(((x) - ARMV8_IDX_COUNTER0) & ARMV8_PMU_COUNTER_MASK)
|
|
|
|
static inline u32 armv8pmu_pmcr_read(void)
|
|
{
|
|
return read_sysreg(pmcr_el0);
|
|
}
|
|
|
|
static inline void armv8pmu_pmcr_write(u32 val)
|
|
{
|
|
val &= ARMV8_PMU_PMCR_MASK;
|
|
isb();
|
|
write_sysreg(val, pmcr_el0);
|
|
}
|
|
|
|
static inline int armv8pmu_has_overflowed(u32 pmovsr)
|
|
{
|
|
return pmovsr & ARMV8_PMU_OVERFLOWED_MASK;
|
|
}
|
|
|
|
static inline int armv8pmu_counter_valid(struct arm_pmu *cpu_pmu, int idx)
|
|
{
|
|
return idx >= ARMV8_IDX_CYCLE_COUNTER &&
|
|
idx <= ARMV8_IDX_COUNTER_LAST(cpu_pmu);
|
|
}
|
|
|
|
static inline int armv8pmu_counter_has_overflowed(u32 pmnc, int idx)
|
|
{
|
|
return pmnc & BIT(ARMV8_IDX_TO_COUNTER(idx));
|
|
}
|
|
|
|
static inline void armv8pmu_select_counter(int idx)
|
|
{
|
|
u32 counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
write_sysreg(counter, pmselr_el0);
|
|
isb();
|
|
}
|
|
|
|
static inline u32 armv8pmu_read_evcntr(int idx)
|
|
{
|
|
armv8pmu_select_counter(idx);
|
|
return read_sysreg(pmxevcntr_el0);
|
|
}
|
|
|
|
static inline u64 armv8pmu_read_hw_counter(struct perf_event *event)
|
|
{
|
|
int idx = event->hw.idx;
|
|
u64 val = 0;
|
|
|
|
val = armv8pmu_read_evcntr(idx);
|
|
if (armv8pmu_event_is_chained(event))
|
|
val = (val << 32) | armv8pmu_read_evcntr(idx - 1);
|
|
return val;
|
|
}
|
|
|
|
static inline u64 armv8pmu_read_counter(struct perf_event *event)
|
|
{
|
|
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
int idx = hwc->idx;
|
|
u64 value = 0;
|
|
|
|
if (!armv8pmu_counter_valid(cpu_pmu, idx))
|
|
pr_err("CPU%u reading wrong counter %d\n",
|
|
smp_processor_id(), idx);
|
|
else if (idx == ARMV8_IDX_CYCLE_COUNTER)
|
|
value = read_sysreg(pmccntr_el0);
|
|
else
|
|
value = armv8pmu_read_hw_counter(event);
|
|
|
|
return value;
|
|
}
|
|
|
|
static inline void armv8pmu_write_evcntr(int idx, u32 value)
|
|
{
|
|
armv8pmu_select_counter(idx);
|
|
write_sysreg(value, pmxevcntr_el0);
|
|
}
|
|
|
|
static inline void armv8pmu_write_hw_counter(struct perf_event *event,
|
|
u64 value)
|
|
{
|
|
int idx = event->hw.idx;
|
|
|
|
if (armv8pmu_event_is_chained(event)) {
|
|
armv8pmu_write_evcntr(idx, upper_32_bits(value));
|
|
armv8pmu_write_evcntr(idx - 1, lower_32_bits(value));
|
|
} else {
|
|
armv8pmu_write_evcntr(idx, value);
|
|
}
|
|
}
|
|
|
|
static inline void armv8pmu_write_counter(struct perf_event *event, u64 value)
|
|
{
|
|
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
int idx = hwc->idx;
|
|
|
|
if (!armv8pmu_counter_valid(cpu_pmu, idx))
|
|
pr_err("CPU%u writing wrong counter %d\n",
|
|
smp_processor_id(), idx);
|
|
else if (idx == ARMV8_IDX_CYCLE_COUNTER) {
|
|
/*
|
|
* The cycles counter is really a 64-bit counter.
|
|
* When treating it as a 32-bit counter, we only count
|
|
* the lower 32 bits, and set the upper 32-bits so that
|
|
* we get an interrupt upon 32-bit overflow.
|
|
*/
|
|
if (!armv8pmu_event_is_64bit(event))
|
|
value |= 0xffffffff00000000ULL;
|
|
write_sysreg(value, pmccntr_el0);
|
|
} else
|
|
armv8pmu_write_hw_counter(event, value);
|
|
}
|
|
|
|
static inline void armv8pmu_write_evtype(int idx, u32 val)
|
|
{
|
|
armv8pmu_select_counter(idx);
|
|
val &= ARMV8_PMU_EVTYPE_MASK;
|
|
write_sysreg(val, pmxevtyper_el0);
|
|
}
|
|
|
|
static inline void armv8pmu_write_event_type(struct perf_event *event)
|
|
{
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
int idx = hwc->idx;
|
|
|
|
/*
|
|
* For chained events, the low counter is programmed to count
|
|
* the event of interest and the high counter is programmed
|
|
* with CHAIN event code with filters set to count at all ELs.
|
|
*/
|
|
if (armv8pmu_event_is_chained(event)) {
|
|
u32 chain_evt = ARMV8_PMUV3_PERFCTR_CHAIN |
|
|
ARMV8_PMU_INCLUDE_EL2;
|
|
|
|
armv8pmu_write_evtype(idx - 1, hwc->config_base);
|
|
armv8pmu_write_evtype(idx, chain_evt);
|
|
} else {
|
|
armv8pmu_write_evtype(idx, hwc->config_base);
|
|
}
|
|
}
|
|
|
|
static inline int armv8pmu_enable_counter(int idx)
|
|
{
|
|
u32 counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
write_sysreg(BIT(counter), pmcntenset_el0);
|
|
return idx;
|
|
}
|
|
|
|
static inline void armv8pmu_enable_event_counter(struct perf_event *event)
|
|
{
|
|
int idx = event->hw.idx;
|
|
|
|
armv8pmu_enable_counter(idx);
|
|
if (armv8pmu_event_is_chained(event))
|
|
armv8pmu_enable_counter(idx - 1);
|
|
isb();
|
|
}
|
|
|
|
static inline int armv8pmu_disable_counter(int idx)
|
|
{
|
|
u32 counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
write_sysreg(BIT(counter), pmcntenclr_el0);
|
|
return idx;
|
|
}
|
|
|
|
static inline void armv8pmu_disable_event_counter(struct perf_event *event)
|
|
{
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
int idx = hwc->idx;
|
|
|
|
if (armv8pmu_event_is_chained(event))
|
|
armv8pmu_disable_counter(idx - 1);
|
|
armv8pmu_disable_counter(idx);
|
|
}
|
|
|
|
static inline int armv8pmu_enable_intens(int idx)
|
|
{
|
|
u32 counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
write_sysreg(BIT(counter), pmintenset_el1);
|
|
return idx;
|
|
}
|
|
|
|
static inline int armv8pmu_enable_event_irq(struct perf_event *event)
|
|
{
|
|
return armv8pmu_enable_intens(event->hw.idx);
|
|
}
|
|
|
|
static inline int armv8pmu_disable_intens(int idx)
|
|
{
|
|
u32 counter = ARMV8_IDX_TO_COUNTER(idx);
|
|
write_sysreg(BIT(counter), pmintenclr_el1);
|
|
isb();
|
|
/* Clear the overflow flag in case an interrupt is pending. */
|
|
write_sysreg(BIT(counter), pmovsclr_el0);
|
|
isb();
|
|
|
|
return idx;
|
|
}
|
|
|
|
static inline int armv8pmu_disable_event_irq(struct perf_event *event)
|
|
{
|
|
return armv8pmu_disable_intens(event->hw.idx);
|
|
}
|
|
|
|
static inline u32 armv8pmu_getreset_flags(void)
|
|
{
|
|
u32 value;
|
|
|
|
/* Read */
|
|
value = read_sysreg(pmovsclr_el0);
|
|
|
|
/* Write to clear flags */
|
|
value &= ARMV8_PMU_OVSR_MASK;
|
|
write_sysreg(value, pmovsclr_el0);
|
|
|
|
return value;
|
|
}
|
|
|
|
static void armv8pmu_enable_event(struct perf_event *event)
|
|
{
|
|
unsigned long flags;
|
|
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
|
|
struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
|
|
|
|
/*
|
|
* Enable counter and interrupt, and set the counter to count
|
|
* the event that we're interested in.
|
|
*/
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
|
|
/*
|
|
* Disable counter
|
|
*/
|
|
armv8pmu_disable_event_counter(event);
|
|
|
|
/*
|
|
* Set event (if destined for PMNx counters).
|
|
*/
|
|
armv8pmu_write_event_type(event);
|
|
|
|
/*
|
|
* Enable interrupt for this counter
|
|
*/
|
|
armv8pmu_enable_event_irq(event);
|
|
|
|
/*
|
|
* Enable counter
|
|
*/
|
|
armv8pmu_enable_event_counter(event);
|
|
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static void armv8pmu_disable_event(struct perf_event *event)
|
|
{
|
|
unsigned long flags;
|
|
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
|
|
struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
|
|
|
|
/*
|
|
* Disable counter and interrupt
|
|
*/
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
|
|
/*
|
|
* Disable counter
|
|
*/
|
|
armv8pmu_disable_event_counter(event);
|
|
|
|
/*
|
|
* Disable interrupt for this counter
|
|
*/
|
|
armv8pmu_disable_event_irq(event);
|
|
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static void armv8pmu_start(struct arm_pmu *cpu_pmu)
|
|
{
|
|
unsigned long flags;
|
|
struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
|
|
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
/* Enable all counters */
|
|
armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E);
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static void armv8pmu_stop(struct arm_pmu *cpu_pmu)
|
|
{
|
|
unsigned long flags;
|
|
struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
|
|
|
|
raw_spin_lock_irqsave(&events->pmu_lock, flags);
|
|
/* Disable all counters */
|
|
armv8pmu_pmcr_write(armv8pmu_pmcr_read() & ~ARMV8_PMU_PMCR_E);
|
|
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
|
|
}
|
|
|
|
static irqreturn_t armv8pmu_handle_irq(struct arm_pmu *cpu_pmu)
|
|
{
|
|
u32 pmovsr;
|
|
struct perf_sample_data data;
|
|
struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
|
|
struct pt_regs *regs;
|
|
int idx;
|
|
|
|
/*
|
|
* Get and reset the IRQ flags
|
|
*/
|
|
pmovsr = armv8pmu_getreset_flags();
|
|
|
|
/*
|
|
* Did an overflow occur?
|
|
*/
|
|
if (!armv8pmu_has_overflowed(pmovsr))
|
|
return IRQ_NONE;
|
|
|
|
/*
|
|
* Handle the counter(s) overflow(s)
|
|
*/
|
|
regs = get_irq_regs();
|
|
|
|
/*
|
|
* Stop the PMU while processing the counter overflows
|
|
* to prevent skews in group events.
|
|
*/
|
|
armv8pmu_stop(cpu_pmu);
|
|
for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
|
|
struct perf_event *event = cpuc->events[idx];
|
|
struct hw_perf_event *hwc;
|
|
|
|
/* Ignore if we don't have an event. */
|
|
if (!event)
|
|
continue;
|
|
|
|
/*
|
|
* We have a single interrupt for all counters. Check that
|
|
* each counter has overflowed before we process it.
|
|
*/
|
|
if (!armv8pmu_counter_has_overflowed(pmovsr, idx))
|
|
continue;
|
|
|
|
hwc = &event->hw;
|
|
armpmu_event_update(event);
|
|
perf_sample_data_init(&data, 0, hwc->last_period);
|
|
if (!armpmu_event_set_period(event))
|
|
continue;
|
|
|
|
if (perf_event_overflow(event, &data, regs))
|
|
cpu_pmu->disable(event);
|
|
}
|
|
armv8pmu_start(cpu_pmu);
|
|
|
|
/*
|
|
* Handle the pending perf events.
|
|
*
|
|
* Note: this call *must* be run with interrupts disabled. For
|
|
* platforms that can have the PMU interrupts raised as an NMI, this
|
|
* will not work.
|
|
*/
|
|
irq_work_run();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int armv8pmu_get_single_idx(struct pmu_hw_events *cpuc,
|
|
struct arm_pmu *cpu_pmu)
|
|
{
|
|
int idx;
|
|
|
|
for (idx = ARMV8_IDX_COUNTER0; idx < cpu_pmu->num_events; idx ++) {
|
|
if (!test_and_set_bit(idx, cpuc->used_mask))
|
|
return idx;
|
|
}
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static int armv8pmu_get_chain_idx(struct pmu_hw_events *cpuc,
|
|
struct arm_pmu *cpu_pmu)
|
|
{
|
|
int idx;
|
|
|
|
/*
|
|
* Chaining requires two consecutive event counters, where
|
|
* the lower idx must be even.
|
|
*/
|
|
for (idx = ARMV8_IDX_COUNTER0 + 1; idx < cpu_pmu->num_events; idx += 2) {
|
|
if (!test_and_set_bit(idx, cpuc->used_mask)) {
|
|
/* Check if the preceding even counter is available */
|
|
if (!test_and_set_bit(idx - 1, cpuc->used_mask))
|
|
return idx;
|
|
/* Release the Odd counter */
|
|
clear_bit(idx, cpuc->used_mask);
|
|
}
|
|
}
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static int armv8pmu_get_event_idx(struct pmu_hw_events *cpuc,
|
|
struct perf_event *event)
|
|
{
|
|
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
unsigned long evtype = hwc->config_base & ARMV8_PMU_EVTYPE_EVENT;
|
|
|
|
/* Always prefer to place a cycle counter into the cycle counter. */
|
|
if (evtype == ARMV8_PMUV3_PERFCTR_CPU_CYCLES) {
|
|
if (!test_and_set_bit(ARMV8_IDX_CYCLE_COUNTER, cpuc->used_mask))
|
|
return ARMV8_IDX_CYCLE_COUNTER;
|
|
}
|
|
|
|
/*
|
|
* Otherwise use events counters
|
|
*/
|
|
if (armv8pmu_event_is_64bit(event))
|
|
return armv8pmu_get_chain_idx(cpuc, cpu_pmu);
|
|
else
|
|
return armv8pmu_get_single_idx(cpuc, cpu_pmu);
|
|
}
|
|
|
|
static void armv8pmu_clear_event_idx(struct pmu_hw_events *cpuc,
|
|
struct perf_event *event)
|
|
{
|
|
int idx = event->hw.idx;
|
|
|
|
clear_bit(idx, cpuc->used_mask);
|
|
if (armv8pmu_event_is_chained(event))
|
|
clear_bit(idx - 1, cpuc->used_mask);
|
|
}
|
|
|
|
/*
|
|
* Add an event filter to a given event. This will only work for PMUv2 PMUs.
|
|
*/
|
|
static int armv8pmu_set_event_filter(struct hw_perf_event *event,
|
|
struct perf_event_attr *attr)
|
|
{
|
|
unsigned long config_base = 0;
|
|
|
|
if (attr->exclude_idle)
|
|
return -EPERM;
|
|
|
|
/*
|
|
* If we're running in hyp mode, then we *are* the hypervisor.
|
|
* Therefore we ignore exclude_hv in this configuration, since
|
|
* there's no hypervisor to sample anyway. This is consistent
|
|
* with other architectures (x86 and Power).
|
|
*/
|
|
if (is_kernel_in_hyp_mode()) {
|
|
if (!attr->exclude_kernel)
|
|
config_base |= ARMV8_PMU_INCLUDE_EL2;
|
|
} else {
|
|
if (attr->exclude_kernel)
|
|
config_base |= ARMV8_PMU_EXCLUDE_EL1;
|
|
if (!attr->exclude_hv)
|
|
config_base |= ARMV8_PMU_INCLUDE_EL2;
|
|
}
|
|
if (attr->exclude_user)
|
|
config_base |= ARMV8_PMU_EXCLUDE_EL0;
|
|
|
|
/*
|
|
* Install the filter into config_base as this is used to
|
|
* construct the event type.
|
|
*/
|
|
event->config_base = config_base;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void armv8pmu_reset(void *info)
|
|
{
|
|
struct arm_pmu *cpu_pmu = (struct arm_pmu *)info;
|
|
u32 idx, nb_cnt = cpu_pmu->num_events;
|
|
|
|
/* The counter and interrupt enable registers are unknown at reset. */
|
|
for (idx = ARMV8_IDX_CYCLE_COUNTER; idx < nb_cnt; ++idx) {
|
|
armv8pmu_disable_counter(idx);
|
|
armv8pmu_disable_intens(idx);
|
|
}
|
|
|
|
/*
|
|
* Initialize & Reset PMNC. Request overflow interrupt for
|
|
* 64 bit cycle counter but cheat in armv8pmu_write_counter().
|
|
*/
|
|
armv8pmu_pmcr_write(ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C |
|
|
ARMV8_PMU_PMCR_LC);
|
|
}
|
|
|
|
static int __armv8_pmuv3_map_event(struct perf_event *event,
|
|
const unsigned (*extra_event_map)
|
|
[PERF_COUNT_HW_MAX],
|
|
const unsigned (*extra_cache_map)
|
|
[PERF_COUNT_HW_CACHE_MAX]
|
|
[PERF_COUNT_HW_CACHE_OP_MAX]
|
|
[PERF_COUNT_HW_CACHE_RESULT_MAX])
|
|
{
|
|
int hw_event_id;
|
|
struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
|
|
|
|
hw_event_id = armpmu_map_event(event, &armv8_pmuv3_perf_map,
|
|
&armv8_pmuv3_perf_cache_map,
|
|
ARMV8_PMU_EVTYPE_EVENT);
|
|
|
|
if (armv8pmu_event_is_64bit(event))
|
|
event->hw.flags |= ARMPMU_EVT_64BIT;
|
|
|
|
/* Onl expose micro/arch events supported by this PMU */
|
|
if ((hw_event_id > 0) && (hw_event_id < ARMV8_PMUV3_MAX_COMMON_EVENTS)
|
|
&& test_bit(hw_event_id, armpmu->pmceid_bitmap)) {
|
|
return hw_event_id;
|
|
}
|
|
|
|
return armpmu_map_event(event, extra_event_map, extra_cache_map,
|
|
ARMV8_PMU_EVTYPE_EVENT);
|
|
}
|
|
|
|
static int armv8_pmuv3_map_event(struct perf_event *event)
|
|
{
|
|
return __armv8_pmuv3_map_event(event, NULL, NULL);
|
|
}
|
|
|
|
static int armv8_a53_map_event(struct perf_event *event)
|
|
{
|
|
return __armv8_pmuv3_map_event(event, NULL, &armv8_a53_perf_cache_map);
|
|
}
|
|
|
|
static int armv8_a57_map_event(struct perf_event *event)
|
|
{
|
|
return __armv8_pmuv3_map_event(event, NULL, &armv8_a57_perf_cache_map);
|
|
}
|
|
|
|
static int armv8_a73_map_event(struct perf_event *event)
|
|
{
|
|
return __armv8_pmuv3_map_event(event, NULL, &armv8_a73_perf_cache_map);
|
|
}
|
|
|
|
static int armv8_thunder_map_event(struct perf_event *event)
|
|
{
|
|
return __armv8_pmuv3_map_event(event, NULL,
|
|
&armv8_thunder_perf_cache_map);
|
|
}
|
|
|
|
static int armv8_vulcan_map_event(struct perf_event *event)
|
|
{
|
|
return __armv8_pmuv3_map_event(event, NULL,
|
|
&armv8_vulcan_perf_cache_map);
|
|
}
|
|
|
|
struct armv8pmu_probe_info {
|
|
struct arm_pmu *pmu;
|
|
bool present;
|
|
};
|
|
|
|
static void __armv8pmu_probe_pmu(void *info)
|
|
{
|
|
struct armv8pmu_probe_info *probe = info;
|
|
struct arm_pmu *cpu_pmu = probe->pmu;
|
|
u64 dfr0;
|
|
u32 pmceid[2];
|
|
int pmuver;
|
|
|
|
dfr0 = read_sysreg(id_aa64dfr0_el1);
|
|
pmuver = cpuid_feature_extract_unsigned_field(dfr0,
|
|
ID_AA64DFR0_PMUVER_SHIFT);
|
|
if (pmuver == 0xf || pmuver == 0)
|
|
return;
|
|
|
|
probe->present = true;
|
|
|
|
/* Read the nb of CNTx counters supported from PMNC */
|
|
cpu_pmu->num_events = (armv8pmu_pmcr_read() >> ARMV8_PMU_PMCR_N_SHIFT)
|
|
& ARMV8_PMU_PMCR_N_MASK;
|
|
|
|
/* Add the CPU cycles counter */
|
|
cpu_pmu->num_events += 1;
|
|
|
|
pmceid[0] = read_sysreg(pmceid0_el0);
|
|
pmceid[1] = read_sysreg(pmceid1_el0);
|
|
|
|
bitmap_from_arr32(cpu_pmu->pmceid_bitmap,
|
|
pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS);
|
|
}
|
|
|
|
static int armv8pmu_probe_pmu(struct arm_pmu *cpu_pmu)
|
|
{
|
|
struct armv8pmu_probe_info probe = {
|
|
.pmu = cpu_pmu,
|
|
.present = false,
|
|
};
|
|
int ret;
|
|
|
|
ret = smp_call_function_any(&cpu_pmu->supported_cpus,
|
|
__armv8pmu_probe_pmu,
|
|
&probe, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return probe.present ? 0 : -ENODEV;
|
|
}
|
|
|
|
static int armv8_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8pmu_probe_pmu(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->handle_irq = armv8pmu_handle_irq,
|
|
cpu_pmu->enable = armv8pmu_enable_event,
|
|
cpu_pmu->disable = armv8pmu_disable_event,
|
|
cpu_pmu->read_counter = armv8pmu_read_counter,
|
|
cpu_pmu->write_counter = armv8pmu_write_counter,
|
|
cpu_pmu->get_event_idx = armv8pmu_get_event_idx,
|
|
cpu_pmu->clear_event_idx = armv8pmu_clear_event_idx,
|
|
cpu_pmu->start = armv8pmu_start,
|
|
cpu_pmu->stop = armv8pmu_stop,
|
|
cpu_pmu->reset = armv8pmu_reset,
|
|
cpu_pmu->set_event_filter = armv8pmu_set_event_filter;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv8_pmuv3_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8_pmu_init(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->name = "armv8_pmuv3";
|
|
cpu_pmu->map_event = armv8_pmuv3_map_event;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
|
|
&armv8_pmuv3_events_attr_group;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
|
|
&armv8_pmuv3_format_attr_group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv8_a35_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8_pmu_init(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->name = "armv8_cortex_a35";
|
|
cpu_pmu->map_event = armv8_a53_map_event;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
|
|
&armv8_pmuv3_events_attr_group;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
|
|
&armv8_pmuv3_format_attr_group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv8_a53_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8_pmu_init(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->name = "armv8_cortex_a53";
|
|
cpu_pmu->map_event = armv8_a53_map_event;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
|
|
&armv8_pmuv3_events_attr_group;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
|
|
&armv8_pmuv3_format_attr_group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv8_a57_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8_pmu_init(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->name = "armv8_cortex_a57";
|
|
cpu_pmu->map_event = armv8_a57_map_event;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
|
|
&armv8_pmuv3_events_attr_group;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
|
|
&armv8_pmuv3_format_attr_group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv8_a72_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8_pmu_init(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->name = "armv8_cortex_a72";
|
|
cpu_pmu->map_event = armv8_a57_map_event;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
|
|
&armv8_pmuv3_events_attr_group;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
|
|
&armv8_pmuv3_format_attr_group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv8_a73_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8_pmu_init(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->name = "armv8_cortex_a73";
|
|
cpu_pmu->map_event = armv8_a73_map_event;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
|
|
&armv8_pmuv3_events_attr_group;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
|
|
&armv8_pmuv3_format_attr_group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv8_thunder_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8_pmu_init(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->name = "armv8_cavium_thunder";
|
|
cpu_pmu->map_event = armv8_thunder_map_event;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
|
|
&armv8_pmuv3_events_attr_group;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
|
|
&armv8_pmuv3_format_attr_group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv8_vulcan_pmu_init(struct arm_pmu *cpu_pmu)
|
|
{
|
|
int ret = armv8_pmu_init(cpu_pmu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cpu_pmu->name = "armv8_brcm_vulcan";
|
|
cpu_pmu->map_event = armv8_vulcan_map_event;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
|
|
&armv8_pmuv3_events_attr_group;
|
|
cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
|
|
&armv8_pmuv3_format_attr_group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id armv8_pmu_of_device_ids[] = {
|
|
{.compatible = "arm,armv8-pmuv3", .data = armv8_pmuv3_init},
|
|
{.compatible = "arm,cortex-a35-pmu", .data = armv8_a35_pmu_init},
|
|
{.compatible = "arm,cortex-a53-pmu", .data = armv8_a53_pmu_init},
|
|
{.compatible = "arm,cortex-a57-pmu", .data = armv8_a57_pmu_init},
|
|
{.compatible = "arm,cortex-a72-pmu", .data = armv8_a72_pmu_init},
|
|
{.compatible = "arm,cortex-a73-pmu", .data = armv8_a73_pmu_init},
|
|
{.compatible = "cavium,thunder-pmu", .data = armv8_thunder_pmu_init},
|
|
{.compatible = "brcm,vulcan-pmu", .data = armv8_vulcan_pmu_init},
|
|
{},
|
|
};
|
|
|
|
static int armv8_pmu_device_probe(struct platform_device *pdev)
|
|
{
|
|
return arm_pmu_device_probe(pdev, armv8_pmu_of_device_ids, NULL);
|
|
}
|
|
|
|
static struct platform_driver armv8_pmu_driver = {
|
|
.driver = {
|
|
.name = ARMV8_PMU_PDEV_NAME,
|
|
.of_match_table = armv8_pmu_of_device_ids,
|
|
},
|
|
.probe = armv8_pmu_device_probe,
|
|
};
|
|
|
|
static int __init armv8_pmu_driver_init(void)
|
|
{
|
|
if (acpi_disabled)
|
|
return platform_driver_register(&armv8_pmu_driver);
|
|
else
|
|
return arm_pmu_acpi_probe(armv8_pmuv3_init);
|
|
}
|
|
device_initcall(armv8_pmu_driver_init)
|
|
|
|
void arch_perf_update_userpage(struct perf_event *event,
|
|
struct perf_event_mmap_page *userpg, u64 now)
|
|
{
|
|
u32 freq;
|
|
u32 shift;
|
|
|
|
/*
|
|
* Internal timekeeping for enabled/running/stopped times
|
|
* is always computed with the sched_clock.
|
|
*/
|
|
freq = arch_timer_get_rate();
|
|
userpg->cap_user_time = 1;
|
|
|
|
clocks_calc_mult_shift(&userpg->time_mult, &shift, freq,
|
|
NSEC_PER_SEC, 0);
|
|
/*
|
|
* time_shift is not expected to be greater than 31 due to
|
|
* the original published conversion algorithm shifting a
|
|
* 32-bit value (now specifies a 64-bit value) - refer
|
|
* perf_event_mmap_page documentation in perf_event.h.
|
|
*/
|
|
if (shift == 32) {
|
|
shift = 31;
|
|
userpg->time_mult >>= 1;
|
|
}
|
|
userpg->time_shift = (u16)shift;
|
|
userpg->time_offset = -now;
|
|
}
|