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linux/arch/powerpc/kernel
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Alexey Kardashevskiy cc7130bf11 powerpc/iommu: Annotate nested lock for lockdep 
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
2021-04-23 01:38:04 +10:00
..
ptrace
powerpc: remove partial register save logic
2021-04-14 23:04:44 +10:00
syscalls
powerpc/syscalls: switch to generic syscallhdr.sh
2021-04-14 23:04:16 +10:00
trace
powerpc: Rename probe_kernel_read_inst()
2021-04-21 22:52:33 +10:00
vdso32
powerpc/vdso: Add support for time namespaces
2021-04-14 23:04:44 +10:00
vdso64
powerpc/vdso: Add support for time namespaces
2021-04-14 23:04:44 +10:00
.gitignore
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
align.c
powerpc: Rename probe_kernel_read_inst()
2021-04-21 22:52:33 +10:00
asm-offsets.c
powerpc/64e/interrupt: use new interrupt return
2021-04-14 23:04:20 +10:00
audit.c
…
btext.c
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
cacheinfo.c
powerpc/cacheinfo: Print correct cache-sibling map/list for L2 cache
2020-12-11 00:10:25 +11:00
cacheinfo.h
powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild
2019-06-15 16:52:06 +10:00
compat_audit.c
…
cpu_setup_6xx.S
powerpc/32: Blacklist functions running with MMU disabled for kprobe
2020-06-02 20:59:11 +10:00
cpu_setup_44x.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cpu_setup_fsl_booke.S
powerpc: Retire e200 core (mpc555x processor)
2020-12-05 21:49:18 +11:00
cpu_setup_pa6t.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
2019-06-05 17:37:06 +02:00
cpu_setup_power.c
powerpc/perf: MMCR0 control for PMU registers under PMCC=00
2020-12-04 01:01:29 +11:00
cpu_setup_ppc970.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cputable.c
arch: powerpc: Stop building and using oprofile
2021-01-29 10:05:51 +05:30
crash_dump.c
powerpc: Add prefixed instructions to instruction data type
2020-05-19 00:10:39 +10:00
dawr.c
powerpc/watchpoint: Guest support for 2nd DAWR hcall
2020-07-26 23:34:19 +10:00
dbell.c
powerpc: handle irq_enter/irq_exit in interrupt handler wrappers
2021-02-09 00:10:49 +11:00
dma-iommu.c
powerpc/dma: Fallback to dma_ops when persistent memory present
2020-11-27 10:33:42 +01:00
dma-mask.c
…
dma-swiotlb.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
dt_cpu_ftrs.c
arch: powerpc: Stop building and using oprofile
2021-01-29 10:05:51 +05:30
early_32.c
powerpc/fsl_booke/32: implement KASLR infrastructure
2019-11-13 19:27:40 +11:00
eeh_cache.c
powerpc/eeh_cache: Fix a possible debugfs deadlock
2020-11-02 12:54:20 +11:00
eeh_driver.c
Merge tag 'pci-v5.9-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
2020-08-07 18:48:15 -07:00
eeh_event.c
powerpc/eeh: Fix build with STACKTRACE=n
2019-09-14 00:01:14 +10:00
eeh_pe.c
powerpc/eeh: Delete eeh_pe->config_addr
2020-10-07 22:34:47 +11:00
eeh_sysfs.c
powerpc/eeh: Pass eeh_dev to eeh_ops->resume_notify()
2020-07-26 23:34:20 +10:00
eeh.c
powerpc/eeh: remove unneeded semicolon
2021-04-23 01:38:04 +10:00
entry_32.S
powerpc/32: Manage KUAP in C
2021-03-29 13:22:11 +11:00
entry_64.S
powerpc/64e/interrupt: reconcile irq soft-mask state in C
2021-04-14 23:04:43 +10:00
epapr_hcalls.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
epapr_paravirt.c
powerpc: Use a datatype for instructions
2020-05-19 00:10:37 +10:00
exceptions-64e.S
powerpc/64e/interrupt: handle bad_page_fault in C
2021-04-14 23:04:43 +10:00
exceptions-64s.S
Merge branch 'topic/ppc-kvm' into next
2021-04-18 23:55:12 +10:00
fadump.c
powerpc/fadump: Fix sparse warnings
2021-04-22 20:59:04 +10:00
firmware.c
powerpc: Reintroduce is_kvm_guest() as a fast-path check
2020-12-04 01:01:22 +11:00
fpu.S
powerpc/32: Always enable data translation in exception prolog
2021-03-29 13:22:05 +11:00
fsl_booke_entry_mapping.S
powerpc/fsl_booke/32: implement KASLR infrastructure
2019-11-13 19:27:40 +11:00
head_8xx.S
powerpc/8xx: Enhance readability of trap types
2021-04-21 22:52:31 +10:00
head_32.h
powerpc/32s: Move KUEP locking/unlocking in C
2021-03-29 13:22:10 +11:00
head_40x.S
powerpc/32: Refactor saving of volatile registers in exception prologs
2021-03-29 13:22:10 +11:00
head_44x.S
powerpc/32: Remove the xfer parameter in EXCEPTION() macro
2021-03-29 13:22:09 +11:00
head_64.S
powerpc/64s: Remove MSR[ISF] bit
2020-12-09 23:48:14 +11:00
head_book3s_32.S
powerpc/32s: Enhance readability of trap types
2021-04-21 22:52:31 +10:00
head_booke.h
powerpc/32s: Move KUEP locking/unlocking in C
2021-03-29 13:22:10 +11:00
head_fsl_booke.S
powerpc/64e: Trivial spelling fixes throughout head_fsl_booke.S
2021-03-29 13:22:12 +11:00
hw_breakpoint_constraints.c
powerpc/uaccess: Remove __get/put_user_inatomic()
2021-04-03 21:21:41 +11:00
hw_breakpoint.c
powerpc/watchpoint: Workaround P10 DD1 issue with VSX-32 byte instructions
2020-12-11 00:09:10 +11:00
idle_6xx.S
powerpc/32: Return directly from power_save_ppc32_restore()
2021-03-29 13:22:10 +11:00
idle_book3e.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
idle_book3s.S
powerpc/64s: power4 nap fixup in C
2021-04-08 21:17:45 +10:00
idle_e500.S
powerpc/32: Return directly from power_save_ppc32_restore()
2021-03-29 13:22:10 +11:00
idle.c
sched/idle: Fix arch_cpu_idle() vs tracing
2020-11-24 16:47:35 +01:00
ima_arch.c
powerpc/ima: Fix secure boot rules in ima arch policy
2020-05-07 17:25:54 +10:00
interrupt.c
powerpc/traps: Enhance readability for trap types
2021-04-17 22:20:19 +10:00
io-workarounds.c
mm: reorder includes after introduction of linux/pgtable.h
2020-06-09 09:39:13 -07:00
io.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
iomap.c
powerpc: inline iomap accessors
2020-12-04 01:01:09 +11:00
iommu.c
powerpc/iommu: Annotate nested lock for lockdep
2021-04-23 01:38:04 +10:00
irq.c
powerpc/irq: Enhance readability of trap types
2021-04-21 22:52:32 +10:00
isa-bridge.c
powerpc: remove __ioremap_at and __iounmap_at
2020-06-02 10:59:10 -07:00
jump_label.c
powerpc: Switch to relative jump labels
2021-04-03 21:22:21 +11:00
kgdb.c
powerpc/kernel: Trivial typo fix in kgdb.c
2021-03-29 13:22:15 +11:00
kprobes-ftrace.c
ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs
2020-11-13 12:14:55 -05:00
kprobes.c
powerpc: kprobes: Use generic kretprobe trampoline handler
2020-09-08 11:52:34 +02:00
kvm_emul.S
powerpc/kvm: Add ifdefs around template code
2019-09-14 00:04:40 +10:00
kvm.c
powerpc/kvm: Explicitly mark kvm guest code as __init
2019-09-14 00:04:40 +10:00
l2cr_6xx.S
powerpc: Drop SYNC_601() ISYNC_601() and SYNC()
2020-10-08 21:17:13 +11:00
legacy_serial.c
powerpc/legacy_serial: Use early_ioremap()
2021-04-22 20:59:15 +10:00
Makefile
Merge tag 'powerpc-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2021-02-22 14:34:00 -08:00
mce_power.c
powerpc/64s/pseries: Add ERAT specific machine check handler
2020-12-04 01:01:23 +11:00
mce.c
powerpc/mce: save ignore_event flag unconditionally for UE
2021-04-21 22:52:32 +10:00
misc_32.S
powerpc/irq: Inline call_do_irq() and call_do_softirq()
2021-03-29 13:22:17 +11:00
misc_64.S
powerpc/irq: Inline call_do_irq() and call_do_softirq()
2021-03-29 13:22:17 +11:00
misc.S
powerpc/32: Blacklist functions running with MMU disabled for kprobe
2020-06-02 20:59:11 +10:00
module_32.c
powerpc: module_[32|64].c: replace swap function with built-in one
2020-05-11 23:15:14 +10:00
module_64.c
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
2020-06-17 10:57:41 -07:00
module.c
powerpc/modules: Load modules closer to kernel text
2021-04-14 23:04:13 +10:00
msi.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
note.S
powerpc: Add PowerPC Capabilities ELF note
2019-08-30 09:40:15 +10:00
nvram_64.c
Merge tag 'powerpc-5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2020-06-05 12:39:30 -07:00
of_platform.c
powerpc/eeh: Remove eeh_dev_phb_init_dynamic()
2020-07-26 23:34:19 +10:00
optprobes_head.S
powerpc: Enable OPTPROBES on PPC32
2021-04-21 22:52:32 +10:00
optprobes.c
powerpc: Enable OPTPROBES on PPC32
2021-04-21 22:52:32 +10:00
paca.c
powerpc: Avoid broken GCC __attribute__((optimize))
2020-11-19 14:50:14 +11:00
pci_32.c
powerpc/64: Adjust order in pcibios_init()
2019-08-22 23:11:48 +10:00
pci_64.c
Merge tag 'powerpc-5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2020-06-05 12:39:30 -07:00
pci_dn.c
powerpc/pci: Move PHB discovery for PCI_DN using platforms
2021-02-09 00:01:05 +11:00
pci_of_scan.c
powerpc/pci: Remove pcibios_setup_bus_devices()
2020-01-06 16:25:29 +11:00
pci-common.c
powerpc/pci: Add ppc_md.discover_phbs()
2021-02-03 09:46:36 +11:00
pci-hotplug.c
powerpc/eeh: Release EEH device state synchronously
2020-05-18 21:58:44 +10:00
pmc.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ppc32.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ppc_save_regs.S
powerpc: Improve ppc_save_regs()
2020-04-04 21:40:57 +11:00
proc_powerpc.c
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
process.c
powerpc/traps: Enhance readability for trap types
2021-04-17 22:20:19 +10:00
prom_init_check.sh
powerpc/prom_init: Undo relocation before entering secure mode
2019-10-29 15:12:17 +11:00
prom_init.c
powerpc: remove unneeded semicolon
2021-03-24 14:09:29 +11:00
prom_parse.c
…
prom.c
powerpc/smp: Cache CPU to chip lookup
2021-04-17 10:40:51 +10:00
reloc_32.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
reloc_64.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
rtas_flash.c
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
rtas_pci.c
mm: reorder includes after introduction of linux/pgtable.h
2020-06-09 09:39:13 -07:00
rtas-proc.c
powerpc/rtas: rename RTAS_RMOBUF_MAX to RTAS_USER_REGION_SIZE
2021-04-14 23:04:16 +10:00
rtas-rtc.c
…
rtas.c
powerpc/rtas: rename RTAS_RMOBUF_MAX to RTAS_USER_REGION_SIZE
2021-04-14 23:04:16 +10:00
rtasd.c
powerpc/rtasd: simplify handle_rtas_event(), emit message on events
2020-07-16 13:12:38 +10:00
secure_boot.c
powerpc/pseries: Detect secure and trusted boot state of the system.
2020-07-16 14:49:53 +10:00
security.c
powerpc/security: Make symbol 'stf_barrier' static
2021-04-14 23:04:13 +10:00
secvar-ops.c
powerpc/powernv: Add OPAL API interface to access secure variable
2019-11-13 00:33:22 +11:00
secvar-sysfs.c
powerpc: expose secure variables to userspace via sysfs
2019-11-13 00:33:22 +11:00
setup_32.c
powerpc/32: Statically initialise first emergency context
2021-03-29 13:22:06 +11:00
setup_64.c
powerpc/powernv: Enable HAIL (HV AIL) for ISA v3.1 processors
2021-04-18 23:19:29 +10:00
setup-common.c
powerpc: Fix section mismatch warning in smp_setup_pacas()
2021-03-29 13:22:14 +11:00
setup.h
powerpc: remove unneeded semicolons
2021-02-09 00:10:50 +11:00
signal_32.c
powerpc: remove partial register save logic
2021-04-14 23:04:44 +10:00
signal_64.c
powerpc: remove partial register save logic
2021-04-14 23:04:44 +10:00
signal.c
powerpc/64: context tracking remove _TIF_NOHZ
2021-02-09 00:02:12 +11:00
signal.h
powerpc/signal32: Convert do_setcontext[_tm]() to user access block
2021-04-03 21:22:19 +11:00
smp-tbsync.c
…
smp.c
powerpc/smp: Set numa node before updating mask
2021-04-17 22:46:31 +10:00
stacktrace.c
powerpc: Fix arch_stack_walk() to have running function as first entry
2021-03-29 13:22:16 +11:00
suspend.c
PM: hibernate: powerpc: Expose pfn_is_nosave() prototype
2019-06-14 10:48:56 +02:00
swsusp_32.S
powerpc/32: Blacklist functions running with MMU disabled for kprobe
2020-06-02 20:59:11 +10:00
swsusp_64.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 505
2019-06-19 17:11:22 +02:00
swsusp_asm64.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 505
2019-06-19 17:11:22 +02:00
swsusp_booke.S
…
swsusp.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
sys_ppc32.c
powerpc/compat_sys: swap hi/lo parts of 64-bit syscall args in LE mode
2021-02-11 23:35:07 +11:00
syscalls.c
powerpc/syscalls: Use sys_old_select() in ppc_select()
2021-03-26 23:19:42 +11:00
sysfs.c
powerpc/sysfs: Remove unused 'err' variable in sysfs_create_dscr_default()
2020-09-18 20:05:24 +10:00
systbl_chk.sh
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
systbl.S
powerpc/syscalls: switch to generic syscalltbl.sh
2021-04-14 23:04:16 +10:00
tau_6xx.c
powerpc: handle irq_enter/irq_exit in interrupt handler wrappers
2021-02-09 00:10:49 +11:00
time.c
powerpc: handle irq_enter/irq_exit in interrupt handler wrappers
2021-02-09 00:10:49 +11:00
tm.S
powerpc/tm: Save and restore AMR on treclaim and trechkpt
2020-10-06 23:22:25 +11:00
traps.c
powerpc/traps: Enhance readability for trap types
2021-04-17 22:20:19 +10:00
ucall.S
powerpc/kernel: Add ucall_norets() ultravisor call handler
2019-08-30 09:40:15 +10:00
udbg_16550.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
udbg.c
powerpc/udbg: Make it safe to call udbg_printf() always
2019-10-11 19:33:25 +11:00
uprobes.c
powerpc/uprobes: Validation for prefixed instruction
2021-03-29 12:52:24 +11:00
vdso32_wrapper.S
powerpc/vdso: fix unnecessary rebuilds of vgettimeofday.o
2021-01-30 22:23:42 +11:00
vdso64_wrapper.S
powerpc/vdso: fix unnecessary rebuilds of vgettimeofday.o
2021-01-30 22:23:42 +11:00
vdso.c
powerpc/vdso: Add support for time namespaces
2021-04-14 23:04:44 +10:00
vecemu.c
powerpc: Define and use get_user_instr() et. al.
2020-05-19 00:10:37 +10:00
vector.S
powerpc/32: Always enable data translation in exception prolog
2021-03-29 13:22:05 +11:00
vmlinux.lds.S
powerpc/64s: fix scv entry fallback flush vs interrupt
2021-01-20 15:58:19 +11:00
watchdog.c
powerpc: move NMI entry/exit code into wrapper
2021-02-09 00:10:50 +11:00