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linux/arch/powerpc/kernel
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Alexey Kardashevskiy 2708da3dbb powerpc/iommu: Annotate nested lock for lockdep 
[ Upstream commit cc7130bf11 ]

The IOMMU table is divided into pools for concurrent mappings and each
pool has a separate spinlock. When taking the ownership of an IOMMU group
to pass through a device to a VM, we lock these spinlocks which triggers
a false negative warning in lockdep (below).

This fixes it by annotating the large pool's spinlock as a nest lock
which makes lockdep not complaining when locking nested locks if
the nest lock is locked already.

===
WARNING: possible recursive locking detected
5.11.0-le_syzkaller_a+fstn1 #100 Not tainted
--------------------------------------------
qemu-system-ppc/4129 is trying to acquire lock:
c0000000119bddb0 (&(p->lock)/1){....}-{2:2}, at: iommu_take_ownership+0xac/0x1e0

but task is already holding lock:
c0000000119bdd30 (&(p->lock)/1){....}-{2:2}, at: iommu_take_ownership+0xac/0x1e0

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&(p->lock)/1);
  lock(&(p->lock)/1);
===

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210301063653.51003-1-aik@ozlabs.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-05-22 10:59:42 +02:00
..
trace
powerpc: consolidate -mno-sched-epilog into FTRACE flags
2019-01-13 09:51:05 +01:00
vdso32
powerpc: Fix vDSO clock_getres()
2019-12-17 20:35:40 +01:00
vdso64
powerpc: Fix vDSO clock_getres()
2019-12-17 20:35:40 +01:00
.gitignore
powerpc: Ignore generated vmlinux.lds in git
2008-10-07 14:26:18 +11:00
align.c
powerpc/sstep: Introduce GETTYPE macro
2018-06-03 21:19:40 +10:00
asm-offsets.c
powerpc: Fix vDSO clock_getres()
2019-12-17 20:35:40 +01:00
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/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild
2020-01-27 14:50:55 +01:00
cacheinfo.h
powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild
2020-01-27 14:50:55 +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: clean inclusions of asm/feature-fixups.h
2018-07-30 22:48:17 +10:00
cpu_setup_44x.S
powerpc/44x: Add support for the AMCC APM821xx SoC
2010-10-13 08:47:09 -04:00
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
[POWERPC] pasemi: Enable one more hid bit
2007-04-24 21:31:49 +10:00
cpu_setup_power.S
powerpc/64s: Don't init FSCR_DSCR in __init_FSCR()
2020-09-03 11:24:16 +02:00
cpu_setup_ppc970.S
powerpc, KVM: Split HVMODE_206 cpu feature bit into separate HV and architecture bits
2011-07-12 13:16:58 +03:00
cputable.c
powerpc: fix hardware PMU exception bug on PowerVM compatibility mode systems
2020-03-11 14:15:12 +01:00
crash_dump.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
crash.c
powerpc: remove kdump.h from page.h
2018-07-30 22:47:53 +10:00
dbell.c
KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flag
2020-01-09 10:19:08 +01:00
dma-iommu.c
powerpc/dma: Fix dma_map_ops::get_required_mask
2020-09-23 12:11:02 +02:00
dma-swiotlb.c
swiotlb: rename swiotlb_free to swiotlb_exit
2018-01-15 09:35:39 +01:00
dma.c
PCI: Call dma_debug_add_bus() for pci_bus_type from PCI core
2018-07-30 15:58:01 -05:00
dt_cpu_ftrs.c
powerpc/64s: Don't let DT CPU features set FSCR_DSCR
2020-06-22 09:05:29 +02:00
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/powernv/iov: Ensure the pdn for VFs always contains a valid PE number
2020-02-24 08:34:36 +01:00
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: Fix use of EEH_PE_KEEP on wrong field
2019-12-01 09:16:18 +01:00
eeh_sysfs.c
powerpc/eeh: Add EEH notify resume sysfs
2018-01-27 20:02:52 +11:00
eeh.c
powerpc/eeh: Fix EEH handling for hugepages in ioremap space.
2021-05-22 10:59:20 +02:00
entry_32.S
powerpc/32: Clear on-stack exception marker upon exception return
2019-03-23 20:10:07 +01:00
entry_64.S
powerpc/book3s64: Fix link stack flush on context switch
2019-12-01 09:17:46 +01:00
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/fsl: Fix the flush of branch predictor.
2019-04-03 06:26:20 +02:00
exceptions-64s.S
powerpc/64s: flush L1D after user accesses
2020-11-22 10:02:26 +01:00
fadump.c
powerpc/fadump: Do not allow hot-remove memory from fadump reserved area.
2019-02-12 19:47:16 +01:00
firmware.c
powerpc: fix implicit use of cache.h in kernel/firmware.c
2011-10-31 19:30:41 -04:00
fpu.S
powerpc: clean inclusions of asm/feature-fixups.h
2018-07-30 22:48:17 +10:00
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 software emulation interrupt
2021-03-04 09:39:47 +01:00
head_32.S
powerpc: clean inclusions of asm/feature-fixups.h
2018-07-30 22:48:17 +10:00
head_40x.S
powerpc/405: move PPC405_ERR77 in asm-405.h
2018-07-30 22:48:13 +10:00
head_44x.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
head_64.S
powerpc/64: Set up a kernel stack for secondaries before cpu_restore()
2020-12-30 11:25:51 +01:00
head_booke.h
powerpc/fsl: Fixed warning: orphan section `__btb_flush_fixup'
2019-04-03 06:26:20 +02:00
head_fsl_booke.S
powerpc/fsl: Flush the branch predictor at each kernel entry (32 bit)
2019-04-03 06:26:20 +02:00
hw_breakpoint.c
perf/arch/powerpc: Implement hw_breakpoint_arch_parse()
2018-06-26 09:07:55 +02:00
idle_6xx.S
powerpc: clean inclusions of asm/feature-fixups.h
2018-07-30 22:48:17 +10:00
idle_book3e.S
powerpc/64s: make PACA_IRQ_HARD_DIS track MSR[EE] closely
2018-07-24 22:03:14 +10:00
idle_book3s.S
powerpc/powernv/idle: Restore AMR/UAMOR/AMOR after idle
2020-04-17 10:48:53 +02:00
idle_e500.S
powerpc: clean inclusions of asm/feature-fixups.h
2018-07-30 22:48:17 +10:00
idle_power4.S
powerpc/64s: Fix PACA_IRQ_HARD_DIS accounting in idle_power4()
2018-08-14 15:36:02 +10:00
idle.c
powerpc/idle: Convert use of typedef ctl_table to struct ctl_table
2013-07-01 11:10:35 +10:00
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
powerpc/powernv: Add PIO accessors for Power8 LPC bus
2013-08-14 14:58:08 +10:00
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: Annotate nested lock for lockdep
2021-05-22 10:59:42 +02:00
irq.c
powerpc/irq: fix stack overflow verification
2019-12-31 16:36:32 +01:00
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: move 'asm goto' support test to Kconfig
2019-06-04 08:02:34 +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/kgdb: add kgdb_arch_set/remove_breakpoint()
2020-01-27 14:50:00 +01:00
kprobes-ftrace.c
bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe
2018-06-21 12:33:19 +02:00
kprobes.c
powerpc/kprobes: Ignore traps that happened in real mode
2020-04-17 10:48:53 +02:00
kvm_emul.S
powerpc: move ASM_CONST and stringify_in_c() into asm-const.h
2018-07-30 22:48:16 +10:00
kvm.c
kmemleak: powerpc: skip scanning holes in the .bss section
2019-05-08 07:21:50 +02:00
l2cr_6xx.S
powerpc: clean inclusions of asm/feature-fixups.h
2018-07-30 22:48:17 +10:00
legacy_serial.c
powerpc: Look for "stdout-path" when setting up legacy consoles
2018-12-19 19:19:52 +01:00
machine_kexec_32.c
treewide: convert uses of ATTRIB_NORETURN to __noreturn
2012-01-12 20:13:03 -08:00
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
powerpc/kexec: Use common error handling code in setup_new_fdt()
2018-08-10 22:12:36 +10:00
machine_kexec.c
powerpc/crashkernel: Take "mem=" option into account
2020-06-25 15:32:51 +02:00
Makefile
powerpc: Make setjmp/longjmp signature standard
2020-04-17 10:48:54 +02:00
mce_power.c
powerpc/mm/mce: Keep irqs disabled during lockless page table walk
2020-01-27 14:51:14 +01:00
mce.c
powerpc/mce: Schedule work from irq_work
2019-10-11 18:20:49 +02:00
misc_32.S
powerpc: clean inclusions of asm/feature-fixups.h
2018-07-30 22:48:17 +10:00
misc_64.S
powerpc: Allow flush_icache_range to work across ranges >4GB
2019-12-17 20:35:16 +01:00
misc.S
powerpc/misc: merge reloc_offset() and add_reloc_offset()
2018-06-04 00:39:17 +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/64/module: REL32 relocation range check
2018-11-21 09:19:08 +01:00
module.c
powerpc64/module elfv1: Set opd addresses after module relocation
2018-11-13 11:08:50 -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/msi: Fix NULL pointer access in teardown code
2018-12-19 19:19:52 +01:00
nvram_64.c
pstore: Convert buf_lock to semaphore
2019-06-11 12:20:52 +02:00
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: Remove -Wattribute-alias pragmas
2018-06-25 23:21:13 +09:00
pci_64.c
powerpc: Remove -Wattribute-alias pragmas
2018-06-25 23:21:13 +09:00
pci_dn.c
powerpc/sriov: Remove VF eeh_dev state when disabling SR-IOV
2020-02-24 08:34:50 +01:00
pci_of_scan.c
powerpc/pci/of: Parse unassigned resources
2020-05-10 10:30:06 +02:00
pci-common.c
powerpc/pci: Add ppc_md.discover_phbs()
2021-03-17 16:43:45 +01:00
pci-hotplug.c
powerpc/pci: Unroll two pass loop when scanning bridges
2017-12-18 23:05:52 -06:00
pmc.c
bug.h: add include of it to various implicit C users
2012-02-29 17:15:08 -05:00
ppc32.h
powerpc: switch to generic old sigaction()
2013-02-03 18:16:10 -05:00
ppc_save_regs.S
powerpc: move ASM_CONST and stringify_in_c() into asm-const.h
2018-07-30 22:48:16 +10:00
proc_powerpc.c
powerpc: Use octal numbers for file permissions
2018-01-22 05:48:33 +11:00
process.c
powerpc/process: Fix flush_all_to_thread for SPE
2019-12-01 09:17:01 +01:00
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/pseries: Enable support for ibm,drc-info property
2020-01-27 14:49:52 +01:00
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: Mark identical_pvr_fixup as __init
2021-05-22 10:59:35 +02:00
ptrace32.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
ptrace.c
powerpc/ptrace: Simplify vr_get/set() to avoid GCC warning
2019-03-23 20:10:07 +01:00
reloc_32.S
powerpc: Don't flush/invalidate the d/icache for an unknown relocation type
2013-07-01 11:10:34 +10:00
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
Merge tag 'powerpc-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2018-06-07 10:23:33 -07:00
rtas-rtc.c
powerpc: use time64_t in read_persistent_clock
2018-06-03 20:43:33 +10:00
rtas.c
powerpc/rtas: Fix typo of ibm,open-errinjct in RTAS filter
2020-12-30 11:26:12 +01:00
rtasd.c
powerpc/pseries: Remove prrn_work workqueue
2019-04-20 09:16:01 +02:00
security.c
powerpc/security: Fix wrong message when RFI Flush is disable
2020-01-04 19:12:56 +01:00
setup_32.c
powerpc/32: Include setup.h header file to fix warnings
2018-08-10 22:12:38 +10:00
setup_64.c
powerpc/64s: flush L1D after user accesses
2020-11-22 10:02:26 +01:00
setup-common.c
powerpc/64: Set up a kernel stack for secondaries before cpu_restore()
2020-12-30 11:25:51 +01:00
setup.h
powerpc/tau: Synchronize function prototypes and body
2018-05-25 12:04:43 +10:00
signal_32.c
powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery
2020-02-28 16:38:48 +01:00
signal_64.c
powerpc/64/tm: Don't let userspace set regs->trap via sigreturn
2020-04-17 10:48:53 +02:00
signal.c
powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery
2020-02-28 16:38:48 +01:00
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/smp: Set numa node before updating mask
2021-05-22 10:59:41 +02:00
stacktrace.c
powerpc/64s: Fix build failures with CONFIG_NMI_IPI=n
2018-06-19 23:03:50 +10:00
suspend.c
nosave: consolidate __nosave_{begin,end} in <asm/sections.h>
2014-10-09 22:26:04 -04:00
swsusp_32.S
powerpc/32s: fix suspend/resume when IBATs 4-7 are used
2019-07-26 09:14:29 +02:00
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: clean inclusions of asm/feature-fixups.h
2018-07-30 22:48:17 +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: Remove -Wattribute-alias pragmas
2018-06-25 23:21:13 +09:00
sysfs.c
powerpc: Warn about use of smt_snooze_delay
2020-11-05 11:08:51 +01:00
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: Disable TAU between measurements
2020-10-30 10:38:19 +01:00
time.c
Revert "powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled"
2020-04-29 16:31:14 +02:00
tm.S
powerpc/tm: Avoid possible userspace r1 corruption on reclaim
2018-09-25 22:51:32 +10:00
traps.c
powerpc: improve handling of unrecoverable system reset
2021-03-17 16:43:46 +01:00
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/vdso: Fix vdso cpu truncation
2020-08-19 08:14:57 +02:00
vecemu.c
powerpc: Add a missing include header
2018-05-25 12:04:46 +10:00
vector.S
powerpc: move ASM_CONST and stringify_in_c() into asm-const.h
2018-07-30 22:48:16 +10:00
vmlinux.lds.S
vmlinux.lds.h: Create section for protection against instrumentation
2021-03-24 11:07:31 +01:00
watchdog.c
powerpc/watchdog: Use hrtimers for per-CPU heartbeat
2019-05-31 06:46:12 -07:00