Athira Rajeev 55402a4618 powerpc/perf: Fix power_pmu_disable to call clear_pmi_irq_pending only if PMI is pending ... [ Upstream commit fb6433b48a ] Running selftest with CONFIG_PPC_IRQ_SOFT_MASK_DEBUG enabled in kernel triggered below warning: [ 172.851380] ------------[ cut here ]------------ [ 172.851391] WARNING: CPU: 8 PID: 2901 at arch/powerpc/include/asm/hw_irq.h:246 power_pmu_disable+0x270/0x280 [ 172.851402] Modules linked in: dm_mod bonding nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables rfkill nfnetlink sunrpc xfs libcrc32c pseries_rng xts vmx_crypto uio_pdrv_genirq uio sch_fq_codel ip_tables ext4 mbcache jbd2 sd_mod t10_pi sg ibmvscsi ibmveth scsi_transport_srp fuse [ 172.851442] CPU: 8 PID: 2901 Comm: lost_exception_ Not tainted 5.16.0-rc5-03218-g798527287598 #2 [ 172.851451] NIP: c00000000013d600 LR: c00000000013d5a4 CTR: c00000000013b180 [ 172.851458] REGS: c000000017687860 TRAP: 0700 Not tainted (5.16.0-rc5-03218-g798527287598) [ 172.851465] MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 48004884 XER: 20040000 [ 172.851482] CFAR: c00000000013d5b4 IRQMASK: 1 [ 172.851482] GPR00: c00000000013d5a4 c000000017687b00 c000000002a10600 0000000000000004 [ 172.851482] GPR04: 0000000082004000 c0000008ba08f0a8 0000000000000000 00000008b7ed0000 [ 172.851482] GPR08: 00000000446194f6 0000000000008000 c00000000013b118 c000000000d58e68 [ 172.851482] GPR12: c00000000013d390 c00000001ec54a80 0000000000000000 0000000000000000 [ 172.851482] GPR16: 0000000000000000 0000000000000000 c000000015d5c708 c0000000025396d0 [ 172.851482] GPR20: 0000000000000000 0000000000000000 c00000000a3bbf40 0000000000000003 [ 172.851482] GPR24: 0000000000000000 c0000008ba097400 c0000000161e0d00 c00000000a3bb600 [ 172.851482] GPR28: c000000015d5c700 0000000000000001 0000000082384090 c0000008ba0020d8 [ 172.851549] NIP [c00000000013d600] power_pmu_disable+0x270/0x280 [ 172.851557] LR [c00000000013d5a4] power_pmu_disable+0x214/0x280 [ 172.851565] Call Trace: [ 172.851568] [c000000017687b00] [c00000000013d5a4] power_pmu_disable+0x214/0x280 (unreliable) [ 172.851579] [c000000017687b40] [c0000000003403ac] perf_pmu_disable+0x4c/0x60 [ 172.851588] [c000000017687b60] [c0000000003445e4] __perf_event_task_sched_out+0x1d4/0x660 [ 172.851596] [c000000017687c50] [c000000000d1175c] __schedule+0xbcc/0x12a0 [ 172.851602] [c000000017687d60] [c000000000d11ea8] schedule+0x78/0x140 [ 172.851608] [c000000017687d90] [c0000000001a8080] sys_sched_yield+0x20/0x40 [ 172.851615] [c000000017687db0] [c0000000000334dc] system_call_exception+0x18c/0x380 [ 172.851622] [c000000017687e10] [c00000000000c74c] system_call_common+0xec/0x268 The warning indicates that MSR_EE being set(interrupt enabled) when there was an overflown PMC detected. This could happen in power_pmu_disable since it runs under interrupt soft disable condition ( local_irq_save ) and not with interrupts hard disabled. commit 2c9ac51b85 ("powerpc/perf: Fix PMU callbacks to clear pending PMI before resetting an overflown PMC") intended to clear PMI pending bit in Paca when disabling the PMU. It could happen that PMC gets overflown while code is in power_pmu_disable callback function. Hence add a check to see if PMI pending bit is set in Paca before clearing it via clear_pmi_pending. Fixes: 2c9ac51b85 ("powerpc/perf: Fix PMU callbacks to clear pending PMI before resetting an overflown PMC") Reported-by: Sachin Sant <sachinp@linux.ibm.com> Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Tested-by: Sachin Sant <sachinp@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220122033429.25395-1-atrajeev@linux.vnet.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-02-01 17:25:46 +01:00
..
alpha	alpha: Declare virt_to_phys and virt_to_bus parameter as pointer to volatile	2021-09-30 10:11:07 +02:00
arc	ARC: export clear_user_page() for modules	2021-09-22 12:28:04 +02:00
arm	ARM: imx: rename DEBUG_IMX21_IMX27_UART to DEBUG_IMX27_UART	2022-01-27 10:54:11 +01:00
arm64	arm64: errata: Fix exec handling in erratum 1418040 workaround	2022-02-01 17:25:40 +01:00
c6x
csky	perf: Protect perf_guest_cbs with RCU	2022-01-20 09:17:50 +01:00
h8300	h8300: fix PREEMPTION build, TI_PRE_COUNT undefined	2021-02-17 11:02:28 +01:00
hexagon	hexagon: clean up timer-regs.h	2021-11-26 10:39:19 +01:00
ia64	ia64: don't do IA64_CMPXCHG_DEBUG without CONFIG_PRINTK	2021-11-18 14:03:55 +01:00
m68k	m68k: set a default value for MEMORY_RESERVE	2021-11-18 14:04:24 +01:00
microblaze
mips	MIPS: Octeon: Fix build errors using clang	2022-01-27 10:54:23 +01:00
nds32	perf: Protect perf_guest_cbs with RCU	2022-01-20 09:17:50 +01:00
nios2	nios2: Make NIOS2_DTB_SOURCE_BOOL depend on !COMPILE_TEST	2021-11-02 19:48:23 +01:00
openrisc	openrisc: Add clone3 ABI wrapper	2022-01-27 10:54:06 +01:00
parisc	parisc: Fix lpa and lpa_user defines	2022-01-27 10:54:26 +01:00
powerpc	powerpc/perf: Fix power_pmu_disable to call clear_pmi_irq_pending only if PMI is pending	2022-02-01 17:25:46 +01:00
riscv	perf: Protect perf_guest_cbs with RCU	2022-01-20 09:17:50 +01:00
s390	s390/hypfs: include z/VM guests with access control group set	2022-02-01 17:25:38 +01:00
sh	sh: define __BIG_ENDIAN for math-emu	2021-11-26 10:39:12 +01:00
sparc	sparc64: fix pci_iounmap() when CONFIG_PCI is not set	2021-10-09 14:40:56 +02:00
um	um: registers: Rename function names to avoid conflicts and build problems	2022-01-27 10:54:18 +01:00
x86	x86/MCE/AMD: Allow thresholding interface updates after init	2022-02-01 17:25:42 +01:00
xtensa	xtensa: xtfpga: Try software restart before simulating CPU reset	2021-10-27 09:56:47 +02:00
.gitignore
Kconfig	arch/cc: Introduce a function to check for confidential computing features	2021-11-18 14:04:32 +01:00