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Michael Ellerman 5cc05910f2 powerpc/64s: Wire up arch_trigger_cpumask_backtrace() 
This allows eg. the RCU stall detector, or the soft/hardlockup
detectors to trigger a backtrace on all CPUs.

We implement this by sending a "safe" NMI, which will actually only
send an IPI. Unfortunately the generic code prints "NMI", so that's a
little confusing but we can probably live with it.

If one of the CPUs doesn't respond to the IPI, we then print some info
from it's paca and do a backtrace based on its saved_r1.

Example output:

  INFO: rcu_sched detected stalls on CPUs/tasks:
  	2-...0: (0 ticks this GP) idle=1be/1/4611686018427387904 softirq=1055/1055 fqs=25735
  	(detected by 4, t=58847 jiffies, g=58, c=57, q=1258)
  Sending NMI from CPU 4 to CPUs 2:
  CPU 2 didn't respond to backtrace IPI, inspecting paca.
  irq_soft_mask: 0x01 in_mce: 0 in_nmi: 0 current: 3623 (bash)
  Back trace of paca->saved_r1 (0xc0000000e1c83ba0) (possibly stale):
  Call Trace:
  [c0000000e1c83ba0] [0000000000000014] 0x14 (unreliable)
  [c0000000e1c83bc0] [c000000000765798] lkdtm_do_action+0x48/0x80
  [c0000000e1c83bf0] [c000000000765a40] direct_entry+0x110/0x1b0
  [c0000000e1c83c90] [c00000000058e650] full_proxy_write+0x90/0xe0
  [c0000000e1c83ce0] [c0000000003aae3c] __vfs_write+0x6c/0x1f0
  [c0000000e1c83d80] [c0000000003ab214] vfs_write+0xd4/0x240
  [c0000000e1c83dd0] [c0000000003ab5cc] ksys_write+0x6c/0x110
  [c0000000e1c83e30] [c00000000000b860] system_call+0x58/0x6c

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
2018-06-03 20:43:43 +10:00
..
trace
powerpc: Only support DYNAMIC_FTRACE not static
2018-05-03 22:32:29 +10:00
vdso32
powerpc/kbuild: Remove CROSS32 defines from top level powerpc Makefile
2018-06-01 23:08:06 +10:00
vdso64
powerpc/vdso64: Add support for CLOCK_{REALTIME/MONOTONIC}_COARSE
2017-12-04 15:01:09 +11:00
.gitignore
…
align.c
powerpc: Fix check for copy/paste instructions in alignment handler
2017-10-25 12:42:35 +02:00
asm-offsets.c
powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths
2018-05-03 22:32:25 +10:00
audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
btext.c
powerpc: Make function btext_initialize static
2018-05-25 12:04:44 +10:00
cacheinfo.c
powerpc: Convert to using %pOF instead of full_name
2017-08-23 22:27:04 +10:00
cacheinfo.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cpu_setup_6xx.S
powerpc: Free up CPU feature bits on 64-bit machines
2018-03-24 00:38:51 +11:00
cpu_setup_44x.S
…
cpu_setup_fsl_booke.S
powerpc: Free up CPU feature bits on 64-bit machines
2018-03-24 00:38:51 +11:00
cpu_setup_pa6t.S
…
cpu_setup_power.S
powerpc/64s: Clear PCR on boot
2018-05-18 16:05:15 +10:00
cpu_setup_ppc970.S
…
cputable.c
powerpc/64s: Remove POWER4 support
2018-04-01 00:47:50 +11:00
crash_dump.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
crash.c
powerpc/64: Use array of paca pointers and allocate pacas individually
2018-03-30 23:34:23 +11:00
dbell.c
powerpc: Introduce msgsnd/doorbell barrier primitives
2017-04-13 23:34:33 +10:00
dma-iommu.c
powerpc: rename dma_direct_ to dma_nommu_
2018-01-10 16:41:14 +01:00
dma-swiotlb.c
swiotlb: rename swiotlb_free to swiotlb_exit
2018-01-15 09:35:39 +01:00
dma.c
powerpc: rename swiotlb_dma_ops
2018-01-15 09:35:26 +01:00
dt_cpu_ftrs.c
powerpc: Add TIDR CPU feature for POWER9
2018-06-03 20:40:31 +10:00
eeh_cache.c
powerpc/eeh: Fix misleading comment in __eeh_addr_cache_get_device()
2018-03-27 23:44:58 +11:00
eeh_dev.c
powerpc/eeh: Create PHB PEs after EEH is initialized
2017-09-21 14:56:00 +10:00
eeh_driver.c
powerpc/eeh: Refactor report functions
2018-06-03 20:43:41 +10:00
eeh_event.c
powerpc/eeh: Manage EEH_PE_RECOVERING inside eeh_handle_normal_event()
2018-03-27 23:44:58 +11:00
eeh_pe.c
powerpc/eeh: Introduce eeh_for_each_pe()
2018-06-03 20:43:39 +10:00
eeh_sysfs.c
powerpc/eeh: Add EEH notify resume sysfs
2018-01-27 20:02:52 +11:00
eeh.c
powerpc/eeh: Add message when PE processing at parent
2018-06-03 20:43:39 +10:00
entry_32.S
powerpc/8xx: Only perform perf counting when perf is in use.
2018-01-16 23:47:12 +11:00
entry_64.S
powerpc/mm/hash: Add missing isync prior to kernel stack SLB switch
2018-06-03 20:40:37 +10:00
epapr_hcalls.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
epapr_paravirt.c
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2014-06-10 18:54:22 -07:00
exceptions-64e.S
powerpc/64s: Fix may_hard_irq_enable() for PMI soft masking
2018-02-08 23:56:10 +11:00
exceptions-64s.S
powerpc/64: Save stack pointer when we hard disable interrupts
2018-06-03 20:43:42 +10:00
fadump.c
powerpc/fadump: Unregister fadump on kexec down path.
2018-05-03 23:19:30 +10:00
firmware.c
…
fpu.S
Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
2016-10-14 14:26:58 -07:00
fsl_booke_entry_mapping.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head_8xx.S
powerpc/8xx: fix invalid register expression in head_8xx.S
2018-05-25 00:08:26 +10:00
head_32.S
powerpc: Fix DABR match on hash based systems
2017-11-13 22:12:48 +11:00
head_40x.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
head_44x.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
head_64.S
powerpc/64: Use array of paca pointers and allocate pacas individually
2018-03-30 23:34:23 +11:00
head_booke.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head_fsl_booke.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
hw_breakpoint.c
powerpc/ptrace: Fix enforcement of DAWR constraints
2018-05-21 14:47:44 +10:00
idle_6xx.S
…
idle_book3e.S
powerpc/64: Rename soft_enabled to irq_soft_mask
2018-01-19 22:37:01 +11:00
idle_book3s.S
powerpc/kvm: Fix lockups when running KVM guests on Power8
2018-04-19 16:22:20 +10:00
idle_e500.S
powerpc/e500mc: Remove dead L2 flushing code in idle_e500.S
2015-06-02 21:37:19 -05:00
idle_power4.S
powerpc/64: Rename soft_enabled to irq_soft_mask
2018-01-19 22:37:01 +11:00
idle.c
…
ima_kexec.c
powerpc: ima: send the kexec buffer to the next kernel
2016-12-20 09:48:44 -08:00
io-workarounds.c
powerpc: Convert to using %pOF instead of full_name
2017-08-23 22:27:04 +10:00
io.c
…
iomap.c
powerpc: iomap.c: introduce io{read|write}64_{lo_hi|hi_lo}
2018-04-05 14:59:26 +10:00
iommu.c
powerpc/iommu: Use permission-specific DEVICE_ATTR variants
2017-09-01 16:42:54 +10:00
irq.c
powerpc/time: account broadcast timer event interrupts separately
2018-06-03 20:40:29 +10:00
isa-bridge.c
powerpc: Convert to using %pOF instead of full_name
2017-08-23 22:27:04 +10:00
jump_label.c
jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP}
2015-08-03 11:34:12 +02:00
kexec_elf_64.c
kernel/kexec_file.c: allow archs to set purgatory load address
2018-04-13 17:10:28 -07:00
kgdb.c
powerpc/8xx: Getting rid of remaining use of CONFIG_8xx
2017-08-10 23:32:12 +10:00
kprobes-ftrace.c
powerpc/kprobes: Do not disable interrupts for optprobes and kprobes_on_ftrace
2017-11-12 23:51:41 +11:00
kprobes.c
powerpc/kprobes: Fix call trace due to incorrect preempt count
2018-03-31 00:10:33 +11:00
kvm_emul.S
…
kvm.c
powerpc/kvm: Prefer fault_in_pages_readable function
2018-05-17 14:12:40 +10:00
l2cr_6xx.S
powerpc/l2cr_6xx: Fix invalid use of register expressions
2017-08-15 21:04:32 +10:00
legacy_serial.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
machine_kexec_32.c
…
machine_kexec_64.c
powerpc/64/kexec: fix race in kexec when XIVE is shutdown
2018-05-10 23:25:08 +10:00
machine_kexec_file_64.c
kexec_file,x86,powerpc: factor out kexec_file_ops functions
2018-04-13 17:10:27 -07:00
machine_kexec.c
powerpc64/kexec: Hard disable ftrace before switching to the new kernel
2018-05-03 22:32:27 +10:00
Makefile
powerpc updates for 4.17
2018-04-07 12:08:19 -07:00
mce_power.c
powerpc/mce: Fix a bug where mce loops on memory UE.
2018-04-24 13:54:51 +10:00
mce.c
powerpc updates for 4.16
2018-02-02 10:01:04 -08:00
misc_32.S
powerpc/40x: Clear MSR_DR in one insn instead of two
2017-06-02 19:20:43 +10:00
misc_64.S
powerpc: Remove unused flush_dcache_phys_range()
2018-03-20 16:47:53 +11:00
misc.S
powerpc/32: Use stmw/lmw for registers save/restore in asm
2018-05-18 00:09:06 +10:00
module_32.c
powerpc/sparse: Fix plain integer as NULL pointer warning
2018-05-25 12:04:38 +10:00
module_64.c
powerpc/modules: remove unused mod_arch_specific.toc field
2018-05-28 18:46:34 +10:00
module.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
module.lds
powerpc/modules: Fix alignment of .toc section in kernel modules
2017-12-11 13:03:35 +11:00
msi.c
powerpc: Remove MSI-related PCI controller ops from ppc_md
2015-06-02 11:47:45 +10:00
nvram_64.c
powerpc/64: Fix strncpy() related build failures with GCC 8.1
2018-06-03 20:40:24 +10:00
of_platform.c
powerpc: Convert to using %pOF instead of full_name
2017-08-23 22:27:04 +10:00
optprobes_head.S
powerpc/64: Rename soft_enabled to irq_soft_mask
2018-01-19 22:37:01 +11:00
optprobes.c
powerpc/kprobes: Do not disable interrupts for optprobes and kprobes_on_ftrace
2017-11-12 23:51:41 +11:00
paca.c
Merge branch 'topic/paca' into next
2018-03-31 09:09:36 +11:00
pci_32.c
powerpc/32: Add a missing include header
2018-05-25 12:04:46 +10:00
pci_64.c
powerpc: Fix build by disabling attribute-alias warning for SYSCALL_DEFINEx
2018-06-03 20:40:24 +10:00
pci_dn.c
powerpc/pci: Separate SR-IOV Calls
2017-12-11 13:03:35 +11:00
pci_of_scan.c
pci-v4.16-changes
2018-02-06 09:59:40 -08:00
pci-common.c
powerpc/pci: Use generic pci_mmap_resource_range()
2018-02-28 16:18:53 -06:00
pci-hotplug.c
powerpc/pci: Unroll two pass loop when scanning bridges
2017-12-18 23:05:52 -06:00
pmc.c
…
ppc32.h
…
ppc_save_regs.S
powerpc/32: Use stmw/lmw for registers save/restore in asm
2018-05-18 00:09:06 +10:00
proc_powerpc.c
powerpc: Use octal numbers for file permissions
2018-01-22 05:48:33 +11:00
process.c
powerpc: use task_pid_nr() for TID allocation
2018-06-03 20:40:31 +10:00
prom_init_check.sh
powerpc/mm/radix: Update command line parsing for disable_radix
2018-04-04 16:59:50 +10:00
prom_init.c
powerpc/prom: Fix %u/%llx usage since prom_printf() change
2018-06-02 01:48:11 +10:00
prom_parse.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
prom.c
powerpc/prom: Drop support for old FDT versions
2018-05-11 23:29:04 +10:00
ptrace32.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
ptrace.c
powerpc/ptrace: Use copy_{from, to}_user() rather than open-coding
2018-06-03 20:43:41 +10:00
reloc_32.S
…
reloc_64.S
powerpc/asm: Convert .llong directives to .8byte
2017-08-31 14:26:47 +10:00
rtas_flash.c
powerpc: Use octal numbers for file permissions
2018-01-22 05:48:33 +11:00
rtas_pci.c
powerpc/kernel: Change retrieval of pci_dn
2017-08-31 14:26:40 +10:00
rtas-proc.c
powerpc: rtas: clean up time handling
2018-06-03 20:43:33 +10:00
rtas-rtc.c
powerpc: use time64_t in read_persistent_clock
2018-06-03 20:43:33 +10:00
rtas.c
powerpc: Fix build by disabling attribute-alias warning for SYSCALL_DEFINEx
2018-06-03 20:40:24 +10:00
rtasd.c
vfs: do bulk POLL* -> EPOLL* replacement
2018-02-11 14:34:03 -08:00
security.c
powerpc: Move default security feature flags
2018-04-03 21:50:08 +10:00
setup_32.c
powerpc/32: Add missing prototypes for (early|machine)_init()
2018-03-13 15:50:42 +11:00
setup_64.c
powerpc64/ftrace: Delay enabling ftrace on secondary cpus
2018-05-03 22:32:26 +10:00
setup-common.c
powerpc/tau: Synchronize function prototypes and body
2018-05-25 12:04:43 +10:00
setup.h
powerpc/tau: Synchronize function prototypes and body
2018-05-25 12:04:43 +10:00
signal_32.c
powerpc: Fix build by disabling attribute-alias warning for SYSCALL_DEFINEx
2018-06-03 20:40:24 +10:00
signal_64.c
powerpc: Fix build by disabling attribute-alias warning for SYSCALL_DEFINEx
2018-06-03 20:40:24 +10:00
signal.c
powerpc: Check address limit on user-mode return (TIF_FSCHECK)
2018-06-03 20:43:42 +10:00
signal.h
powerpc/syscalls: signal_{32, 64} - switch to SYSCALL_DEFINE
2018-05-10 23:25:13 +10:00
smp-tbsync.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
smp.c
powerpc/nmi: Add an API for sending "safe" NMIs
2018-06-03 20:43:43 +10:00
stacktrace.c
powerpc/64s: Wire up arch_trigger_cpumask_backtrace()
2018-06-03 20:43:43 +10:00
suspend.c
nosave: consolidate __nosave_{begin,end} in <asm/sections.h>
2014-10-09 22:26:04 -04:00
swsusp_32.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swsusp_64.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/nmi.h>
2017-03-02 08:42:30 +01:00
swsusp_asm64.S
powerpc: Fix invalid use of register expressions
2017-08-10 22:29:41 +10:00
swsusp_booke.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swsusp.c
powerpc/swsusp: Include suspend.h to silence sparse warnings
2017-03-20 19:02:49 +11:00
sys_ppc32.c
powerpc/syscalls: kill ppc32_select()
2018-05-10 23:25:15 +10:00
syscalls.c
powerpc: Fix build by disabling attribute-alias warning for SYSCALL_DEFINEx
2018-06-03 20:40:24 +10:00
sysfs.c
Merge branch 'topic/paca' into next
2018-03-31 09:09:36 +11:00
systbl_chk.c
powerpc/syscalls: Add COMPAT_SPU_NEW() macro
2018-05-10 23:25:14 +10:00
systbl_chk.sh
powerpc: Make it clearer that systbl check errors are errors
2018-05-10 23:25:16 +10:00
systbl.S
powerpc/syscalls: Add COMPAT_SPU_NEW() macro
2018-05-10 23:25:14 +10:00
tau_6xx.c
powerpc/tau: Make some function static
2018-05-25 12:04:44 +10:00
time.c
powerpc: remove unused to_tm() helper
2018-06-03 20:43:34 +10:00
tm.S
powerpc: Export tm_enable()/tm_disable/tm_abort() APIs
2018-05-24 16:04:02 +10:00
traps.c
powerpc/fscr: Enable interrupts earlier before calling get_user()
2018-04-10 11:23:23 +10:00
udbg_16550.c
powerpc: Fix bad NULL pointer check in udbg_uart_getc_poll()
2014-11-12 13:47:20 +11:00
udbg.c
powerpc: Remove the celleb support
2015-04-07 17:15:13 +10:00
uprobes.c
powerpc/uprobes: Implement arch_uretprobe_is_alive()
2017-08-24 16:19:21 +10:00
vdso.c
powerpc: Use feature bit for RTC presence rather than timebase presence
2018-03-24 00:36:45 +11:00
vecemu.c
powerpc: Add a missing include header
2018-05-25 12:04:46 +10:00
vector.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vmlinux.lds.S
powerpc updates for 4.16
2018-02-02 10:01:04 -08:00
watchdog.c
powerpc/watchdog: provide more data in watchdog messages
2018-05-10 23:25:11 +10:00