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b34aa5aaaa
linux_dsm_epyc7002/arch/arm/kernel
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Yang Jihong b34aa5aaaa arm_pmu: Fix write counter incorrect in ARMv7 big-endian mode 
commit fdbef8c4e68ad423416aa6cc93d1616d6f8ac5b3 upstream.

Commit 3a95200d3f ("arm_pmu: Change API to support 64bit counter values")
changes the input "value" type from 32-bit to 64-bit, which introduces the
following problem: ARMv7 PMU counters is 32-bit width, in big-endian mode,
write counter uses high 32-bit, which writes an incorrect value.

Before:

 Performance counter stats for 'ls':

              2.22 msec task-clock                #    0.675 CPUs utilized
                 0      context-switches          #    0.000 K/sec
                 0      cpu-migrations            #    0.000 K/sec
                49      page-faults               #    0.022 M/sec
        2150476593      cycles                    #  966.663 GHz
        2148588788      instructions              #    1.00  insn per cycle
        2147745484      branches                  # 965435.074 M/sec
        2147508540      branch-misses             #   99.99% of all branches

None of the above hw event counters are correct.

Solution:

"value" forcibly converted to 32-bit type before being written to PMU register.

After:

 Performance counter stats for 'ls':

              2.09 msec task-clock                #    0.681 CPUs utilized
                 0      context-switches          #    0.000 K/sec
                 0      cpu-migrations            #    0.000 K/sec
                46      page-faults               #    0.022 M/sec
           2807301      cycles                    #    1.344 GHz
           1060159      instructions              #    0.38  insn per cycle
            250496      branches                  #  119.914 M/sec
             23192      branch-misses             #    9.26% of all branches

Fixes: 3a95200d3f ("arm_pmu: Change API to support 64bit counter values")
Cc: <stable@vger.kernel.org>
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20210430012659.232110-1-yangjihong1@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-14 16:55:39 +02:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
arch_timer.c ARM: 8913/1: arch_timer: include <asm/arch_timer.h> 2019-10-27 21:14:43 +00:00
armksyms.c crypto: lib/sha1 - remove unnecessary includes of linux/cryptohash.h 2020-05-08 15:32:17 +10:00
asm-offsets.c ARM: 9075/1: kernel: Fix interrupted SMC calls 2021-05-22 11:40:53 +02:00
atags_compat.c
atags_parse.c ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address 2021-05-19 10:13:18 +02:00
atags_proc.c ARM: 8973/1: Add missing newline terminator to kernel message 2020-05-07 20:53:10 +01:00
atags.h ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address 2021-05-19 10:13:18 +02:00
bios32.c ARM/PCI: Remove unused fields from struct hw_pci 2020-09-18 22:39:09 +01:00
bugs.c
cpuidle.c treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
crash_dump.c
debug.S ARM: 9005/1: debug: Select flow control for all debug UARTs 2020-09-15 14:35:28 +01:00
devtree.c ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address 2021-05-19 10:13:18 +02:00
dma-isa.c
dma.c
early_printk.c
efi.c
elf.c arm32/64/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK 2020-04-20 19:42:19 +02:00
entry-armv.S ARM: 9030/1: entry: omit FP emulation for UND exceptions taken in kernel mode 2020-12-30 11:53:43 +01:00
entry-common.S
entry-ftrace.S
entry-header.S ARM: uaccess: consolidate uaccess asm to asm/uaccess-asm.h 2020-05-03 17:30:24 +01:00
entry-v7m.S
fiq.c arm: fix the flush_icache_range arguments in set_fiq_handler 2020-06-08 11:05:57 -07:00
fiqasm.S
ftrace.c maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
head-common.S ARM: 8914/1: NOMMU: Fix exc_ret for XIP 2019-10-10 22:23:20 +01:00
head-inflate-data.c
head-nommu.S ARM: 8914/1: NOMMU: Fix exc_ret for XIP 2019-10-10 22:23:20 +01:00
head.S ARM: 9027/1: head.S: explicitly map DT even if it lives in the first physical section 2021-05-19 10:13:18 +02:00
hibernate.c
hw_breakpoint.c ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook 2021-05-19 10:13:01 +02:00
hyp-stub.S arm: Remove the ability to set HYP vectors outside of the decompressor 2020-03-24 10:56:05 +00:00
insn.c
io.c
irq.c ARM: Remove custom IRQ stat accounting 2020-09-17 16:37:28 +01:00
isa.c
iwmmxt.h ARM: 9029/1: Make iwmmxt.S support Clang's integrated assembler 2021-03-17 17:06:26 +01:00
iwmmxt.S ARM: 9029/1: Make iwmmxt.S support Clang's integrated assembler 2021-03-17 17:06:26 +01:00
jump_label.c
kgdb.c maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
machine_kexec.c ARM: kexec: fix oops after TLB are invalidated 2021-02-17 11:02:24 +01:00
Makefile Linux 5.5-rc1 2019-12-10 10:11:00 +01:00
module-plts.c ARM: 8910/1: fix missing declartion of module_frob_arch_sections 2019-10-27 21:14:38 +00:00
module.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
opcodes.c
paravirt.c
patch.c arm/patch: Fix !MMU compile 2020-02-11 12:56:27 +01:00
perf_callchain.c
perf_event_v6.c
perf_event_v7.c arm_pmu: Fix write counter incorrect in ARMv7 big-endian mode 2021-07-14 16:55:39 +02:00
perf_event_xscale.c
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
pj4-cp0.c
process.c sched/idle: Fix arch_cpu_idle() vs tracing 2020-11-24 16:47:35 +01:00
psci_smp.c ARM: 8919/1: make unexported functions static 2019-10-31 16:58:52 +00:00
ptrace.c arm: switch to ->regset_get() 2020-07-27 14:31:09 -04:00
reboot.c ARM: Use reboot_cpu instead of hardcoding it to 0 2020-03-25 12:59:33 +01:00
reboot.h
relocate_kernel.S ARM: kexec: fix oops after TLB are invalidated 2021-02-17 11:02:24 +01:00
return_address.c ARM: 8918/2: only build return_address() if needed 2019-11-15 22:21:07 +00:00
setup.c ARM: 9081/1: fix gcc-10 thumb2-kernel regression 2021-06-30 08:47:16 -04:00
signal.c ARM: ensure the signal page contains defined contents 2021-02-17 11:02:24 +01:00
signal.h ARM: 8920/1: share get_signal_page from signal.c to process.c 2019-10-31 16:58:53 +00:00
sigreturn_codes.S
sleep.S
smccc-call.S ARM: 9075/1: kernel: Fix interrupted SMC calls 2021-05-22 11:40:53 +02:00
smp_scu.c
smp_tlb.c
smp_twd.c
smp.c ARM: Handle no IPI being registered in show_ipi_list() 2020-09-28 11:32:04 +01:00
stacktrace.c ARM: 8992/1: Fix unwind_frame for clang-built kernels 2020-07-21 16:33:40 +01:00
suspend.c ARM: 9066/1: ftrace: pause/unpause function graph tracer in cpu_suspend() 2021-05-22 11:40:52 +02:00
swp_emulate.c mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
sys_arm.c
sys_oabi-compat.c ARM: 9065/1: OABI compat: fix build when EPOLL is not enabled 2021-03-04 11:38:10 +01:00
tcm.c ARM: 8925/1: tcm: include <asm/tcm.h> for missing declarations 2019-10-31 16:58:56 +00:00
thumbee.c
time.c ARM/time: Replace <linux/clk-provider.h> by <linux/of_clk.h> 2020-05-15 22:54:57 +02:00
topology.c ARM, sched/topology: Revert back to default scheduler topology 2020-08-19 10:49:47 +02:00
traps.c maccess: make get_kernel_nofault() check for minimal type compatibility 2020-06-18 12:10:37 -07:00
unwind.c arm: add loglvl to unwind_backtrace() 2020-06-09 09:39:10 -07:00
v7m.c
vdso.c ARM: 8987/1: VDSO: Fix incorrect clock_gettime64 2020-07-21 16:32:55 +01:00
vmlinux-xip.lds.S arm/build: Assert for unwanted sections 2020-09-01 10:03:18 +02:00
vmlinux.lds.S arm/build: Always handle .ARM.exidx and .ARM.extab sections 2020-10-27 11:32:21 -07:00
xscale-cp0.c