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linux/arch/arm64/kernel
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Lorenzo Pieralisi f436b2ac90 arm64: kernel: fix architected PMU registers unconditional access 
The Performance Monitors extension is an optional feature of the
AArch64 architecture, therefore, in order to access Performance
Monitors registers safely, the kernel should detect the architected
PMU unit presence through the ID_AA64DFR0_EL1 register PMUVer field
before accessing them.

This patch implements a guard by reading the ID_AA64DFR0_EL1 register
PMUVer field to detect the architected PMU presence and prevent accessing
PMU system registers if the Performance Monitors extension is not
implemented in the core.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: <stable@vger.kernel.org>
Fixes: 60792ad349 ("arm64: kernel: enforce pmuserenr_el0 initialization and restore")
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-01-25 11:09:06 +00:00
..
vdso arm64: build vdso without libgcov 2015-11-12 15:18:07 +00:00
.gitignore
acpi.c Power management and ACPI updates for v4.4-rc1 2015-11-04 18:10:13 -08:00
alternative.c arm64: mm: fold alternatives into .init 2015-12-10 17:36:08 +00:00
arm64ksyms.c ARM: 8480/2: arm64: add implementation for arm-smccc 2016-01-04 16:24:45 +00:00
armv8_deprecated.c arm64: add __init/__initdata section marker to some functions/variables 2015-12-02 12:17:11 +00:00
asm-offsets.c * s390: Support for runtime instrumentation within guests, 2016-01-12 13:22:12 -08:00
cacheinfo.c
cpu_errata.c arm64: KVM: Add workaround for Cortex-A57 erratum 834220 2015-11-24 17:58:14 +01:00
cpu_ops.c arm64: force CONFIG_SMP=y and remove redundant #ifdefs 2015-07-27 11:08:40 +01:00
cpufeature.c arm64: add __init/__initdata section marker to some functions/variables 2015-12-02 12:17:11 +00:00
cpuidle.c arm64: cpuidle: add __init section marker to arm_cpuidle_init 2015-07-02 17:44:27 +01:00
cpuinfo.c arm64: restore bogomips information in /proc/cpuinfo 2015-11-19 17:57:18 +00:00
debug-monitors.c driver core update for 4.4-rc1 2015-11-04 21:50:37 -08:00
efi-entry.S arm64/efi: isolate EFI stub from the kernel proper 2015-10-12 16:20:12 +01:00
efi.c arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM 2015-12-09 16:57:23 +00:00
entry32.S arm64: entry32: remove pointless register assignment 2015-07-10 16:47:13 +01:00
entry-fpsimd.S
entry-ftrace.S arm64: ftrace: fix function_graph tracer panic 2015-10-02 11:12:56 +01:00
entry.S arm64: entry: remove pointless SPSR mode check 2016-01-06 15:40:38 +00:00
fpsimd.c arm64: add __init/__initdata section marker to some functions/variables 2015-12-02 12:17:11 +00:00
ftrace.c arm64: ftrace: modify a stack frame in a safe way 2015-12-21 17:26:01 +00:00
head.S arm64: kernel: fix architected PMU registers unconditional access 2016-01-25 11:09:06 +00:00
hw_breakpoint.c arm64: Fix missing #include in hw_breakpoint.c 2015-10-12 12:10:53 +01:00
hyp-stub.S
image.h arm64: hide __efistub_ aliases from kallsyms 2016-01-25 11:09:04 +00:00
insn.c arm64: insn: remove BUG_ON from codegen 2016-01-17 19:15:26 -05:00
io.c
irq.c arm64: remove irq_count and do_softirq_own_stack() 2015-12-21 17:26:01 +00:00
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kgdb.c arm64/debug: Simplify BRK insn opcode declarations 2015-07-27 11:08:42 +01:00
kuser32.S
Makefile xen: features and fixes for 4.5-rc0 2016-01-12 13:05:36 -08:00
module.c arm64: module: avoid undefined shift behavior in reloc_data() 2016-01-05 11:27:20 +00:00
paravirt.c arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops 2015-12-21 14:40:54 +00:00
pci.c ARM64: PCI: do not enable resources on PROBE_ONLY systems 2015-07-30 20:17:07 +01:00
perf_callchain.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
perf_event.c arm64: perf: add support for Cortex-A72 2015-12-22 14:45:35 +00:00
perf_regs.c
process.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
psci.c drivers: firmware: psci: move power_state handling to generic code 2015-10-02 14:35:16 +01:00
ptrace.c arm64: Clear out any singlestep state on a ptrace detach operation 2015-12-07 17:48:21 +00:00
return_address.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
setup.c arm64 updates for 4.4: 2015-11-04 14:47:13 -08:00
signal32.c arm64: compat: fix vfp save/restore across signal handlers in big-endian 2015-09-17 11:57:03 +01:00
signal.c arm64: Removed unused variable 2015-04-13 20:40:10 +02:00
sleep.S arm64: Store struct thread_info in sp_el0 2015-12-08 11:40:48 +00:00
smccc-call.S ARM: 8480/2: arm64: add implementation for arm-smccc 2016-01-04 16:24:45 +00:00
smp_spin_table.c ARM64: kernel: make cpu_ops hooks DT agnostic 2015-05-19 16:09:29 +01:00
smp.c arm64: smp: make of_parse_and_init_cpus static 2015-11-12 15:18:14 +00:00
stacktrace.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
suspend.c arm64: kernel: pause/unpause function graph tracer in cpu_suspend() 2015-11-17 17:11:45 +00:00
sys32.c arm64: fix implementation of mmap2 compat syscall 2015-03-19 10:43:51 +00:00
sys_compat.c
sys.c arm64: make sys_call_table const 2015-01-27 09:38:08 +00:00
time.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
topology.c arm64: kernel: remove non-legit DT warnings when booting using ACPI 2015-07-27 11:08:41 +01:00
trace-events-emulation.h
traps.c arm64: traps: address fallout from printk -> pr_* conversion 2015-12-21 17:26:02 +00:00
vdso.c arm64: VDSO: fix coarse clock monotonicity regression 2015-08-10 15:37:45 +01:00
vmlinux.lds.S arm64 updates for 4.5: 2016-01-12 12:23:33 -08:00