Wei Huang 477c50e8dc drivers/perf: arm_pmu_acpi: avoid perf IRQ init when guest PMU is off ... We saw perf IRQ init failures when running Linux kernel in an ACPI guest without PMU (i.e. pmu=off). This is because perf IRQ is not present when pmu=off, but arm_pmu_acpi still tries to register or unregister GSI. This patch addresses the problem by checking gicc->performance_interrupt. If it is 0, which is the value set by qemu when pmu=off, we skip the IRQ register/unregister process. [ 4.069470] bc00: 0000000000040b00 ffff0000089db190 [ 4.070267] [<ffff000008134f80>] enable_percpu_irq+0xdc/0xe4 [ 4.071192] [<ffff000008667cc4>] arm_perf_starting_cpu+0x108/0x10c [ 4.072200] [<ffff0000080cbdd4>] cpuhp_invoke_callback+0x14c/0x4ac [ 4.073210] [<ffff0000080ccd3c>] cpuhp_thread_fun+0xd4/0x11c [ 4.074132] [<ffff0000080f1394>] smpboot_thread_fn+0x1b4/0x1c4 [ 4.075081] [<ffff0000080ec90c>] kthread+0x10c/0x138 [ 4.075921] [<ffff0000080833c0>] ret_from_fork+0x10/0x50 [ 4.076947] genirq: Setting trigger mode 4 for irq 43 failed (gic_set_type+0x0/0x74) Signed-off-by: Wei Huang <wei@redhat.com> [will: add comment justifying deviation from ACPI spec, removed redundant hunk] Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2017-05-30 12:40:03 +01:00
..
arm_pmu_acpi.c
arm_pmu_platform.c
arm_pmu.c
Kconfig
Makefile
qcom_l2_pmu.c
qcom_l3_pmu.c
xgene_pmu.c