8324 Commits

Author SHA1 Message Date
Christophe Leroy
9d44d1bd93 powerpc: Use the newly added is_tsk_32bit_task() macro
Two places deserve using the macro is_tsk_32bit_task() added by
commit 252745240ba0 ("powerpc/audit: Fix syscall_get_arch()")

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7304a889dbe885aefad8a8333673c81ee4b8f7a6.1642751874.git.christophe.leroy@csgroup.eu
2022-02-12 22:47:42 +11:00
Christophe Leroy
4ee83a2cfb powerpc/ftrace: Remove ftrace_32.S
Functions in ftrace_32.S are common with PPC64.

Reuse the ones defined for PPC64 with slight modification
when required.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Squash in fixup diff from Christophe]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5e837fc190504c4ef834272e70d60ae33f175d49.1640017960.git.christophe.leroy@csgroup.eu
2022-02-12 22:47:28 +11:00
Christophe Leroy
41315494be powerpc/ftrace: Prepare ftrace_64_mprofile.S for reuse by PPC32
PPC64 mprofile versions and PPC32 are very similar.

Modify PPC64 version so that if can be reused for PPC32.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/82a732915dc71ee766e31809350939331944006d.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:11 +11:00
Christophe Leroy
830213786c powerpc/ftrace: directly call of function graph tracer by ftrace caller
Modify function graph tracer to be handled directly by the standard
ftrace caller.

This is made possible as powerpc now supports
CONFIG_DYNAMIC_FTRACE_WITH_ARGS.

This change simplifies the call of function graph ftrace.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/04d196585ff81bde06a000bd9c633a33a5b21130.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:11 +11:00
Christophe Leroy
0c81ed5ed4 powerpc/ftrace: Refactor ftrace_{en/dis}able_ftrace_graph_caller
ftrace_enable_ftrace_graph_caller() and
ftrace_disable_ftrace_graph_caller() have common code.

They will have even more common code after following patch.

Refactor into a single ftrace_modify_ftrace_graph_caller() function.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f37785a531f1a8f201e1b3da45997a5c77e9d820.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:11 +11:00
Christophe Leroy
c75388a8ce powerpc/ftrace: Prepare PPC64's ftrace_caller() for CONFIG_DYNAMIC_FTRACE_WITH_ARGS
In order to implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS, change ftrace_caller()
to handle LIVEPATCH the same way as frace_caller_regs().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/850817333cc76593699032e8e9a70d8c36e1af1e.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:11 +11:00
Christophe Leroy
d95bf254be powerpc/ftrace: Prepare PPC32's ftrace_caller() for CONFIG_DYNAMIC_FTRACE_WITH_ARGS
In order to implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS, change
ftrace_caller() stack layout to match struct pt_regs.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/da9734eba504998fb914aca12131c9f6bf6120a8.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:11 +11:00
Christophe Leroy
7bdb478c1d powerpc/ftrace: Simplify PPC32's return_to_handler()
return_to_handler() was copied from PPC64. For PPC32 it
just needs to save r3 and r4, and doesn't require any nop
after the bl.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/aab39b77b34fb2c4ed08ed01c547b6ed13643788.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:11 +11:00
Christophe Leroy
7875bc9b07 powerpc/ftrace: Don't save again LR in ftrace_regs_caller() on PPC32
PPC32 mcount() caller already saves LR on stack,
no need to save it again.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/eadcfc770b4f1e35535ffb85e28e858a2c31dec4.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:10 +11:00
Christophe Leroy
a4520b2527 powerpc/ftrace: Add support for livepatch to PPC32
PPC64 needs some special logic to properly set up the TOC.
See commit 85baa095497f ("powerpc/livepatch: Add live patching support
on ppc64le") for details.

PPC32 doesn't have TOC so it doesn't need that logic, so adding
LIVEPATCH support is straight forward.

Add CONFIG_LIVEPATCH_64 and move livepatch stack logic into that item.

Livepatch sample modules all work.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/63cb094125b6a6038c65eeac2abaabbabe63addd.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:10 +11:00
Christophe Leroy
0c850965d6 powerpc/module_32: Fix livepatching for RO modules
Livepatching a loaded module involves applying relocations through
apply_relocate_add(), which attempts to write to read-only memory when
CONFIG_STRICT_MODULE_RWX=y.

R_PPC_ADDR16_LO, R_PPC_ADDR16_HI, R_PPC_ADDR16_HA and R_PPC_REL24 are
the types generated by the kpatch-build userspace tool or klp-convert
kernel tree observed applying a relocation to a post-init module.

Use patch_instruction() to patch those relocations.

Commit 8734b41b3efe ("powerpc/module_64: Fix livepatching for
RO modules") did similar change in module_64.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d5697157cb7dba3927e19aa17c915a83bc550bb2.1640017960.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:10 +11:00
Christophe Leroy
27e21e8f12 powerpc/32: Remove _ENTRY() macro
_ENTRY() is now redundant with _GLOBAL(). Remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/62a35f8dde2bb74c8d0d7a5430cce07a5a3a6fb6.1638273868.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:10 +11:00
Christophe Leroy
1231816373 powerpc/32: Remove remaining .stabs annotations
STABS debug format has been superseded long time ago by DWARF.

Remove the few remaining .stabs annotations from old 32 bits code.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/68932ec2ba6b868d35006b96e90f0890f3da3c05.1638273868.git.christophe.leroy@csgroup.eu
2022-02-07 21:03:10 +11:00
Sourabh Jain
7c5ed82b80 powerpc: Set crashkernel offset to mid of RMA region
On large config LPARs (having 192 and more cores), Linux fails to boot
due to insufficient memory in the first memblock. It is due to the
memory reservation for the crash kernel which starts at 128MB offset of
the first memblock. This memory reservation for the crash kernel doesn't
leave enough space in the first memblock to accommodate other essential
system resources.

The crash kernel start address was set to 128MB offset by default to
ensure that the crash kernel get some memory below the RMA region which
is used to be of size 256MB. But given that the RMA region size can be
512MB or more, setting the crash kernel offset to mid of RMA size will
leave enough space for the kernel to allocate memory for other system
resources.

Since the above crash kernel offset change is only applicable to the LPAR
platform, the LPAR feature detection is pushed before the crash kernel
reservation. The rest of LPAR specific initialization will still
be done during pseries_probe_fw_features as usual.

This patch is dependent on changes to paca allocation for boot CPU. It
expect boot CPU to discover 1T segment support which is introduced by
the patch posted here:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2022-January/239175.html

Reported-by: Abdul haleem <abdhalee@linux.vnet.ibm.com>
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220204085601.107257-1-sourabhjain@linux.ibm.com
2022-02-07 15:26:12 +11:00
Christophe Leroy
4634bf4455 powerpc/603: Clear C bit when PTE is read only
On book3s/32 MMU, PP bits don't offer kernel RO protection,
kernel pages are always RW.

However, on the 603 a page fault is always generated when the
C bit (change bit = dirty bit) is not set.

Enforce kernel RO protection by clearing C bit in TLB miss
handler when the page doesn't have _PAGE_RW flag.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bbb13848ff0100a76ee9ea95118058c30ae95f2c.1643613343.git.christophe.leroy@csgroup.eu
2022-02-03 22:56:44 +11:00
Christophe Leroy
9872cbfb45 powerpc/603: Remove outdated comment
Since commit 84de6ab0e904 ("powerpc/603: don't handle PAGE_ACCESSED
in TLB miss handlers.") page table is not updated anymore by
TLB miss handlers.

Remove the comment.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/38b1ffefd2146fa56bf8aa605d476ad9736bbb37.1643613296.git.christophe.leroy@csgroup.eu
2022-02-03 22:38:13 +11:00
Wedson Almeida Filho
d4be60fe66 powerpc/module_64: use module_init_section instead of patching names
Without this patch, module init sections are disabled by patching their
names in arch-specific code when they're loaded (which prevents code in
layout_sections from finding init sections). This patch uses the new
arch-specific module_init_section instead.

This allows modules that have .init_array sections to have the
initialisers properly called (on load, before init). Without this patch,
the initialisers are not called because .init_array is renamed to
_init_array, and thus isn't found by code in find_module_sections().

Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220202055123.2144842-1-wedsonaf@google.com
2022-02-03 22:20:37 +11:00
Fabiano Rosas
b53c861059 powerpc: Fix debug print in smp_setup_cpu_maps
When figuring out the number of threads, the debug message prints "1
thread" for the first iteration of the loop, instead of the actual
number of threads calculated from the length of the
"ibm,ppc-interrupt-server#s" property.

  * /cpus/PowerPC,POWER8@20...
    ibm,ppc-interrupt-server#s -> 1 threads <--- WRONG
    thread 0 -> cpu 0 (hard id 32)
    thread 1 -> cpu 1 (hard id 33)
    thread 2 -> cpu 2 (hard id 34)
    thread 3 -> cpu 3 (hard id 35)
    thread 4 -> cpu 4 (hard id 36)
    thread 5 -> cpu 5 (hard id 37)
    thread 6 -> cpu 6 (hard id 38)
    thread 7 -> cpu 7 (hard id 39)
  * /cpus/PowerPC,POWER8@28...
    ibm,ppc-interrupt-server#s -> 8 threads
    thread 0 -> cpu 8 (hard id 40)
    thread 1 -> cpu 9 (hard id 41)
    thread 2 -> cpu 10 (hard id 42)
    thread 3 -> cpu 11 (hard id 43)
    thread 4 -> cpu 12 (hard id 44)
    thread 5 -> cpu 13 (hard id 45)
    thread 6 -> cpu 14 (hard id 46)
    thread 7 -> cpu 15 (hard id 47)
(...)

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210120181847.952106-1-farosas@linux.ibm.com
2022-02-03 20:24:59 +11:00
Michael Ellerman
2e7f1e2b30 powerpc/64: Move paca allocation later in boot
Mahesh & Sourabh identified two problems[1][2] with ppc64_bolted_size()
and paca allocation.

The first is that on a Radix capable machine but with "disable_radix" on
the command line, there is a window during early boot where
early_radix_enabled() is true, even though it will later become false.

  early_init_devtree:                       <- early_radix_enabled() = false
    early_init_dt_scan_cpus:                <- early_radix_enabled() = false
        ...
        check_cpu_pa_features:              <- early_radix_enabled() = false
        ...                               ^ <- early_radix_enabled() = TRUE
        allocate_paca:                    | <- early_radix_enabled() = TRUE
            ...                           |
            ppc64_bolted_size:            | <- early_radix_enabled() = TRUE
                if (early_radix_enabled())| <- early_radix_enabled() = TRUE
                    return ULONG_MAX;     |
        ...                               |
    ...                                   | <- early_radix_enabled() = TRUE
    ...                                   | <- early_radix_enabled() = TRUE
    mmu_early_init_devtree()              V
    ...                                     <- early_radix_enabled() = false

This causes ppc64_bolted_size() to return ULONG_MAX for the boot CPU's
paca allocation, even though later it will return a different value.
This is not currently a bug because the paca allocation is also limited
by the RMA size, but that is very fragile.

The second issue is that when using the Hash MMU, when we call
ppc64_bolted_size() for the boot CPU's paca allocation, we have not yet
detected whether 1T segments are available. That causes
ppc64_bolted_size() to return 256MB, even if the machine can actually
support up to 1T. This is usually OK, we generally have space below
256MB for one paca, but for a kdump kernel placed above 256MB it causes
the boot to fail.

At boot we cannot discover all the features of the machine
instantaneously, so there will always be some periods where we have
incomplete knowledge of the system. However both the above problems stem
from the fact that we allocate the boot CPU's paca (and paca pointers
array) before we decide which MMU we are using, or discover its exact
features.

Moving the paca allocation slightly later still can solve both the
issues described above, and means for a normal boot we don't do any
permanent allocations until after we've discovered the MMU.

Note that although we move the boot CPU's paca allocation later, we
still have a temporary paca (boot_paca) accessible via r13, so code that
does read only access to paca fields is safe. The only risk is that some
code writes to the boot_paca, and that write will then be lost when we
switch away from the boot_paca later in early_setup().

The additional code that runs before the paca allocation is primarily
mmu_early_init_devtree(), which is scanning the device tree and
populating globals and cur_cpu_spec with MMU related flags. I do not see
any additional code that writes to paca fields.

[1]: https://lore.kernel.org/r/20211018084434.217772-2-sourabhjain@linux.ibm.com
[2]: https://lore.kernel.org/r/20211018084434.217772-3-sourabhjain@linux.ibm.com

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220124130544.408675-1-mpe@ellerman.id.au
2022-02-02 20:32:11 +11:00
Michal Suchanek
b2a6f60435 powerpc: add link stack flush mitigation status in debugfs.
The link stack flush status is not visible in debugfs. It can be enabled
even when count cache flush is disabled. Add separate file for its
status.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
[mpe: Update for change to link_stack_flush_type]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191127220959.6208-1-msuchanek@suse.de
2022-01-31 13:45:23 +11:00
Nicholas Piggin
8defc2a5dd powerpc/64s/interrupt: Fix decrementer storm
The decrementer exception can fail to be cleared when the interrupt
returns in the case where the decrementer wraps with the next timer
still beyond decrementer_max. This results in a decrementer interrupt
storm. This is triggerable with small decrementer system with hard
and soft watchdogs disabled.

Fix this by always programming the decrementer if there was no timer.

Fixes: 0faf20a1ad16 ("powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use")
Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220124143930.3923442-1-npiggin@gmail.com
2022-01-25 16:50:10 +11:00
Linus Torvalds
dd81e1c7d5 powerpc fixes for 5.17 #2
- A series of bpf fixes, including an oops fix and some codegen fixes.
 
  - Fix a regression in syscall_get_arch() for compat processes.
 
  - Fix boot failure on some 32-bit systems with KASAN enabled.
 
  - A couple of other build/minor fixes.
 
 Thanks to: Athira Rajeev, Christophe Leroy, Dmitry V. Levin, Jiri Olsa, Johan Almbladh,
 Maxime Bizon, Naveen N. Rao, Nicholas Piggin.
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Merge tag 'powerpc-5.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:

 - A series of bpf fixes, including an oops fix and some codegen fixes.

 - Fix a regression in syscall_get_arch() for compat processes.

 - Fix boot failure on some 32-bit systems with KASAN enabled.

 - A couple of other build/minor fixes.

Thanks to Athira Rajeev, Christophe Leroy, Dmitry V. Levin, Jiri Olsa,
Johan Almbladh, Maxime Bizon, Naveen N. Rao, and Nicholas Piggin.

* tag 'powerpc-5.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64s: Mask SRR0 before checking against the masked NIP
  powerpc/perf: Only define power_pmu_wants_prompt_pmi() for CONFIG_PPC64
  powerpc/32s: Fix kasan_init_region() for KASAN
  powerpc/time: Fix build failure due to do_hard_irq_enable() on PPC32
  powerpc/audit: Fix syscall_get_arch()
  powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06
  tools/bpf: Rename 'struct event' to avoid naming conflict
  powerpc/bpf: Update ldimm64 instructions during extra pass
  powerpc32/bpf: Fix codegen for bpf-to-bpf calls
  bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack()
2022-01-23 17:52:42 +02:00
Muchun Song
359745d783 proc: remove PDE_DATA() completely
Remove PDE_DATA() completely and replace it with pde_data().

[akpm@linux-foundation.org: fix naming clash in drivers/nubus/proc.c]
[akpm@linux-foundation.org: now fix it properly]

Link: https://lkml.kernel.org/r/20211124081956.87711-2-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alexey Gladkov <gladkov.alexey@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-22 08:33:37 +02:00
Linus Torvalds
f4484d138b Merge branch 'akpm' (patches from Andrew)
Merge more updates from Andrew Morton:
 "55 patches.

  Subsystems affected by this patch series: percpu, procfs, sysctl,
  misc, core-kernel, get_maintainer, lib, checkpatch, binfmt, nilfs2,
  hfs, fat, adfs, panic, delayacct, kconfig, kcov, and ubsan"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (55 commits)
  lib: remove redundant assignment to variable ret
  ubsan: remove CONFIG_UBSAN_OBJECT_SIZE
  kcov: fix generic Kconfig dependencies if ARCH_WANTS_NO_INSTR
  lib/Kconfig.debug: make TEST_KMOD depend on PAGE_SIZE_LESS_THAN_256KB
  btrfs: use generic Kconfig option for 256kB page size limit
  arch/Kconfig: split PAGE_SIZE_LESS_THAN_256KB from PAGE_SIZE_LESS_THAN_64KB
  configs: introduce debug.config for CI-like setup
  delayacct: track delays from memory compact
  Documentation/accounting/delay-accounting.rst: add thrashing page cache and direct compact
  delayacct: cleanup flags in struct task_delay_info and functions use it
  delayacct: fix incomplete disable operation when switch enable to disable
  delayacct: support swapin delay accounting for swapping without blkio
  panic: remove oops_id
  panic: use error_report_end tracepoint on warnings
  fs/adfs: remove unneeded variable make code cleaner
  FAT: use io_schedule_timeout() instead of congestion_wait()
  hfsplus: use struct_group_attr() for memcpy() region
  nilfs2: remove redundant pointer sbufs
  fs/binfmt_elf: use PT_LOAD p_align values for static PIE
  const_structs.checkpatch: add frequently used ops structs
  ...
2022-01-20 10:41:01 +02:00
Kefeng Wang
20c0357646 mm: percpu: add generic pcpu_populate_pte() function
With NEED_PER_CPU_PAGE_FIRST_CHUNK enabled, we need a function to
populate pte, this patch adds a generic pcpu populate pte function,
pcpu_populate_pte(), which is marked __weak and used on most
architectures, but it is overridden on x86, which has its own
implementation.

Link: https://lkml.kernel.org/r/20211216112359.103822-5-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-20 08:52:52 +02:00
Kefeng Wang
23f917169e mm: percpu: add generic pcpu_fc_alloc/free funciton
With the previous patch, we could add a generic pcpu first chunk
allocate and free function to cleanup the duplicated definations on each
architecture.

Link: https://lkml.kernel.org/r/20211216112359.103822-4-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-20 08:52:52 +02:00
Kefeng Wang
1ca3fb3abd mm: percpu: add pcpu_fc_cpu_to_node_fn_t typedef
Add pcpu_fc_cpu_to_node_fn_t and pass it into pcpu_fc_alloc_fn_t, pcpu
first chunk allocation will call it to alloc memblock on the
corresponding node by it, this is prepare for the next patch.

Link: https://lkml.kernel.org/r/20211216112359.103822-3-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-20 08:52:52 +02:00
Nicholas Piggin
aee101d7b9 powerpc/64s: Mask SRR0 before checking against the masked NIP
Commit 314f6c23dd8d ("powerpc/64s: Mask NIP before checking against
SRR0") masked off the low 2 bits of the NIP value in the interrupt
stack frame in case they are non-zero and mis-compare against a SRR0
register value of a CPU which always reads back 0 from the 2 low bits
which are reserved.

This now causes the opposite problem that an implementation which does
implement those bits in SRR0 will mis-compare against the masked NIP
value in which they have been cleared. QEMU is one such implementation,
and this is allowed by the architecture.

This can be triggered by sigfuz by setting low bits of PT_NIP in the
signal context.

Fix this for now by masking the SRR0 bits as well. Cleaner is probably
to sanitise these values before putting them in registers or stack, but
this is the quick and backportable fix.

Fixes: 314f6c23dd8d ("powerpc/64s: Mask NIP before checking against SRR0")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220117134403.2995059-1-npiggin@gmail.com
2022-01-18 10:25:18 +11:00
Linus Torvalds
35ce8ae9ae Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull signal/exit/ptrace updates from Eric Biederman:
 "This set of changes deletes some dead code, makes a lot of cleanups
  which hopefully make the code easier to follow, and fixes bugs found
  along the way.

  The end-game which I have not yet reached yet is for fatal signals
  that generate coredumps to be short-circuit deliverable from
  complete_signal, for force_siginfo_to_task not to require changing
  userspace configured signal delivery state, and for the ptrace stops
  to always happen in locations where we can guarantee on all
  architectures that the all of the registers are saved and available on
  the stack.

  Removal of profile_task_ext, profile_munmap, and profile_handoff_task
  are the big successes for dead code removal this round.

  A bunch of small bug fixes are included, as most of the issues
  reported were small enough that they would not affect bisection so I
  simply added the fixes and did not fold the fixes into the changes
  they were fixing.

  There was a bug that broke coredumps piped to systemd-coredump. I
  dropped the change that caused that bug and replaced it entirely with
  something much more restrained. Unfortunately that required some
  rebasing.

  Some successes after this set of changes: There are few enough calls
  to do_exit to audit in a reasonable amount of time. The lifetime of
  struct kthread now matches the lifetime of struct task, and the
  pointer to struct kthread is no longer stored in set_child_tid. The
  flag SIGNAL_GROUP_COREDUMP is removed. The field group_exit_task is
  removed. Issues where task->exit_code was examined with
  signal->group_exit_code should been examined were fixed.

  There are several loosely related changes included because I am
  cleaning up and if I don't include them they will probably get lost.

  The original postings of these changes can be found at:
     https://lkml.kernel.org/r/87a6ha4zsd.fsf@email.froward.int.ebiederm.org
     https://lkml.kernel.org/r/87bl1kunjj.fsf@email.froward.int.ebiederm.org
     https://lkml.kernel.org/r/87r19opkx1.fsf_-_@email.froward.int.ebiederm.org

  I trimmed back the last set of changes to only the obviously correct
  once. Simply because there was less time for review than I had hoped"

* 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (44 commits)
  ptrace/m68k: Stop open coding ptrace_report_syscall
  ptrace: Remove unused regs argument from ptrace_report_syscall
  ptrace: Remove second setting of PT_SEIZED in ptrace_attach
  taskstats: Cleanup the use of task->exit_code
  exit: Use the correct exit_code in /proc/<pid>/stat
  exit: Fix the exit_code for wait_task_zombie
  exit: Coredumps reach do_group_exit
  exit: Remove profile_handoff_task
  exit: Remove profile_task_exit & profile_munmap
  signal: clean up kernel-doc comments
  signal: Remove the helper signal_group_exit
  signal: Rename group_exit_task group_exec_task
  coredump: Stop setting signal->group_exit_task
  signal: Remove SIGNAL_GROUP_COREDUMP
  signal: During coredumps set SIGNAL_GROUP_EXIT in zap_process
  signal: Make coredump handling explicit in complete_signal
  signal: Have prepare_signal detect coredumps using signal->core_state
  signal: Have the oom killer detect coredumps using signal->core_state
  exit: Move force_uaccess back into do_exit
  exit: Guarantee make_task_dead leaks the tsk when calling do_task_exit
  ...
2022-01-17 05:49:30 +02:00
Linus Torvalds
f56caedaf9 Merge branch 'akpm' (patches from Andrew)
Merge misc updates from Andrew Morton:
 "146 patches.

  Subsystems affected by this patch series: kthread, ia64, scripts,
  ntfs, squashfs, ocfs2, vfs, and mm (slab-generic, slab, kmemleak,
  dax, kasan, debug, pagecache, gup, shmem, frontswap, memremap,
  memcg, selftests, pagemap, dma, vmalloc, memory-failure, hugetlb,
  userfaultfd, vmscan, mempolicy, oom-kill, hugetlbfs, migration, thp,
  ksm, page-poison, percpu, rmap, zswap, zram, cleanups, hmm, and
  damon)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (146 commits)
  mm/damon: hide kernel pointer from tracepoint event
  mm/damon/vaddr: hide kernel pointer from damon_va_three_regions() failure log
  mm/damon/vaddr: use pr_debug() for damon_va_three_regions() failure logging
  mm/damon/dbgfs: remove an unnecessary variable
  mm/damon: move the implementation of damon_insert_region to damon.h
  mm/damon: add access checking for hugetlb pages
  Docs/admin-guide/mm/damon/usage: update for schemes statistics
  mm/damon/dbgfs: support all DAMOS stats
  Docs/admin-guide/mm/damon/reclaim: document statistics parameters
  mm/damon/reclaim: provide reclamation statistics
  mm/damon/schemes: account how many times quota limit has exceeded
  mm/damon/schemes: account scheme actions that successfully applied
  mm/damon: remove a mistakenly added comment for a future feature
  Docs/admin-guide/mm/damon/usage: update for kdamond_pid and (mk|rm)_contexts
  Docs/admin-guide/mm/damon/usage: mention tracepoint at the beginning
  Docs/admin-guide/mm/damon/usage: remove redundant information
  Docs/admin-guide/mm/damon/usage: update for scheme quotas and watermarks
  mm/damon: convert macro functions to static inline functions
  mm/damon: modify damon_rand() macro to static inline function
  mm/damon: move damon_rand() definition into damon.h
  ...
2022-01-15 20:37:06 +02:00
Aneesh Kumar K.V
21b084fdf2 mm/mempolicy: wire up syscall set_mempolicy_home_node
Link: https://lkml.kernel.org/r/20211202123810.267175-4-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Ben Widawsky <ben.widawsky@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: <linux-api@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-15 16:30:30 +02:00
Linus Torvalds
29ec39fcf1 powerpc updates for 5.17
- Optimise radix KVM guest entry/exit by 2x on Power9/Power10.
 
  - Allow firmware to tell us whether to disable the entry and uaccess flushes on Power10
    or later CPUs.
 
  - Add BPF_PROBE_MEM support for 32 and 64-bit BPF jits.
 
  - Several fixes and improvements to our hard lockup watchdog.
 
  - Activate HAVE_DYNAMIC_FTRACE_WITH_REGS on 32-bit.
 
  - Allow building the 64-bit Book3S kernel without hash MMU support, ie. Radix only.
 
  - Add KUAP (SMAP) support for 40x, 44x, 8xx, Book3E (64-bit).
 
  - Add new encodings for perf_mem_data_src.mem_hops field, and use them on Power10.
 
  - A series of small performance improvements to 64-bit interrupt entry.
 
  - Several commits fixing issues when building with the clang integrated assembler.
 
  - Many other small features and fixes.
 
 Thanks to: Alan Modra, Alexey Kardashevskiy, Ammar Faizi, Anders Roxell, Arnd Bergmann,
 Athira Rajeev, Cédric Le Goater, Christophe JAILLET, Christophe Leroy, Christoph Hellwig,
 Daniel Axtens, David Yang, Erhard Furtner, Fabiano Rosas, Greg Kroah-Hartman, Guo Ren,
 Hari Bathini, Jason Wang, Joel Stanley, Julia Lawall, Kajol Jain, Kees Cook, Laurent
 Dufour, Madhavan Srinivasan, Mark Brown, Minghao Chi, Nageswara R Sastry, Naresh Kamboju,
 Nathan Chancellor, Nathan Lynch, Nicholas Piggin, Nick Child, Oliver O'Halloran, Peiwei
 Hu, Randy Dunlap, Ravi Bangoria, Rob Herring, Russell Currey, Sachin Sant, Sean
 Christopherson, Segher Boessenkool, Thadeu Lima de Souza Cascardo, Tyrel Datwyler, Xiang
 wangx, Yang Guang.
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Merge tag 'powerpc-5.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:

 - Optimise radix KVM guest entry/exit by 2x on Power9/Power10.

 - Allow firmware to tell us whether to disable the entry and uaccess
   flushes on Power10 or later CPUs.

 - Add BPF_PROBE_MEM support for 32 and 64-bit BPF jits.

 - Several fixes and improvements to our hard lockup watchdog.

 - Activate HAVE_DYNAMIC_FTRACE_WITH_REGS on 32-bit.

 - Allow building the 64-bit Book3S kernel without hash MMU support, ie.
   Radix only.

 - Add KUAP (SMAP) support for 40x, 44x, 8xx, Book3E (64-bit).

 - Add new encodings for perf_mem_data_src.mem_hops field, and use them
   on Power10.

 - A series of small performance improvements to 64-bit interrupt entry.

 - Several commits fixing issues when building with the clang integrated
   assembler.

 - Many other small features and fixes.

Thanks to Alan Modra, Alexey Kardashevskiy, Ammar Faizi, Anders Roxell,
Arnd Bergmann, Athira Rajeev, Cédric Le Goater, Christophe JAILLET,
Christophe Leroy, Christoph Hellwig, Daniel Axtens, David Yang, Erhard
Furtner, Fabiano Rosas, Greg Kroah-Hartman, Guo Ren, Hari Bathini, Jason
Wang, Joel Stanley, Julia Lawall, Kajol Jain, Kees Cook, Laurent Dufour,
Madhavan Srinivasan, Mark Brown, Minghao Chi, Nageswara R Sastry, Naresh
Kamboju, Nathan Chancellor, Nathan Lynch, Nicholas Piggin, Nick Child,
Oliver O'Halloran, Peiwei Hu, Randy Dunlap, Ravi Bangoria, Rob Herring,
Russell Currey, Sachin Sant, Sean Christopherson, Segher Boessenkool,
Thadeu Lima de Souza Cascardo, Tyrel Datwyler, Xiang wangx, and Yang
Guang.

* tag 'powerpc-5.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (240 commits)
  powerpc/xmon: Dump XIVE information for online-only processors.
  powerpc/opal: use default_groups in kobj_type
  powerpc/cacheinfo: use default_groups in kobj_type
  powerpc/sched: Remove unused TASK_SIZE_OF
  powerpc/xive: Add missing null check after calling kmalloc
  powerpc/floppy: Remove usage of the deprecated "pci-dma-compat.h" API
  selftests/powerpc: Add a test of sigreturning to an unaligned address
  powerpc/64s: Use EMIT_WARN_ENTRY for SRR debug warnings
  powerpc/64s: Mask NIP before checking against SRR0
  powerpc/perf: Fix spelling of "its"
  powerpc/32: Fix boot failure with GCC latent entropy plugin
  powerpc/code-patching: Replace patch_instruction() by ppc_inst_write() in selftests
  powerpc/code-patching: Move code patching selftests in its own file
  powerpc/code-patching: Move instr_is_branch_{i/b}form() in code-patching.h
  powerpc/code-patching: Move patch_exception() outside code-patching.c
  powerpc/code-patching: Use test_trampoline for prefixed patch test
  powerpc/code-patching: Fix patch_branch() return on out-of-range failure
  powerpc/code-patching: Reorganise do_patch_instruction() to ease error handling
  powerpc/code-patching: Fix unmap_patch_area() error handling
  powerpc/code-patching: Fix error handling in do_patch_instruction()
  ...
2022-01-14 15:17:26 +01:00
Linus Torvalds
4eb766f64d Devicetree updates for v5.17:
Bindings:
 - DT schema conversions for Samsung clocks, RNG bindings, Qcom Command
   DB and rmtfs, gpio-restart, i2c-mux-gpio, i2c-mux-pinctl, Tegra I2C
   and BPMP, pwm-vibrator, Arm DSU, and Cadence macb
 
 - DT schema conversions for Broadcom platforms: interrupt controllers,
   STB GPIO, STB waketimer, STB reset, iProc MDIO mux, iProc PCIe,
   Cygnus PCIe PHY, PWM, USB BDC, BCM6328 LEDs, TMON, SYSTEMPORT, AMAC,
   Northstar 2 PCIe PHY, GENET, moca PHY, GISB arbiter, and SATA
 
 - Add binding schemas for Tegra210 EMC table, TI DC-DC converters,
 
 - Clean-ups of MDIO bus schemas to fix 'unevaluatedProperties' issues
 
 - More fixes due to 'unevaluatedProperties' enabling
 
 - Data type fixes and clean-ups of binding examples found in preparation
   to move to validating DTB files directly (instead of intermediate YAML
   representation.
 
 - Vendor prefixes for T-Head Semiconductor, OnePlus, and Sunplus
 
 - Add various new compatible strings
 
 DT core:
 - Silence a warning for overlapping reserved memory regions
 
 - Reimplement unittest overlay tracking
 
 - Fix stack frame size warning in unittest
 
 - Clean-ups of early FDT scanning functions
 
 - Fix handling of "linux,usable-memory-range" on EFI booted systems
 
 - Add support for 'fail' status on CPU nodes
 
 - Improve error message in of_phandle_iterator_next()
 
 - kbuild: Disable duplicate unit-address warnings for disabled nodes
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Merge tag 'devicetree-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull devicetree updates from Rob Herring:
 "Bindings:

   - DT schema conversions for Samsung clocks, RNG bindings, Qcom
     Command DB and rmtfs, gpio-restart, i2c-mux-gpio, i2c-mux-pinctl,
     Tegra I2C and BPMP, pwm-vibrator, Arm DSU, and Cadence macb

   - DT schema conversions for Broadcom platforms: interrupt
     controllers, STB GPIO, STB waketimer, STB reset, iProc MDIO mux,
     iProc PCIe, Cygnus PCIe PHY, PWM, USB BDC, BCM6328 LEDs, TMON,
     SYSTEMPORT, AMAC, Northstar 2 PCIe PHY, GENET, moca PHY, GISB
     arbiter, and SATA

   - Add binding schemas for Tegra210 EMC table, TI DC-DC converters,

   - Clean-ups of MDIO bus schemas to fix 'unevaluatedProperties' issues

   - More fixes due to 'unevaluatedProperties' enabling

   - Data type fixes and clean-ups of binding examples found in
     preparation to move to validating DTB files directly (instead of
     intermediate YAML representation.

   - Vendor prefixes for T-Head Semiconductor, OnePlus, and Sunplus

   - Add various new compatible strings

  DT core:

   - Silence a warning for overlapping reserved memory regions

   - Reimplement unittest overlay tracking

   - Fix stack frame size warning in unittest

   - Clean-ups of early FDT scanning functions

   - Fix handling of "linux,usable-memory-range" on EFI booted systems

   - Add support for 'fail' status on CPU nodes

   - Improve error message in of_phandle_iterator_next()

   - kbuild: Disable duplicate unit-address warnings for disabled nodes"

* tag 'devicetree-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (114 commits)
  dt-bindings: net: mdio: Drop resets/reset-names child properties
  dt-bindings: clock: samsung: convert S5Pv210 to dtschema
  dt-bindings: clock: samsung: convert Exynos5410 to dtschema
  dt-bindings: clock: samsung: convert Exynos5260 to dtschema
  dt-bindings: clock: samsung: extend Exynos7 bindings with UFS
  dt-bindings: clock: samsung: convert Exynos7 to dtschema
  dt-bindings: clock: samsung: convert Exynos5433 to dtschema
  dt-bindings: i2c: maxim,max96712: Add bindings for Maxim Integrated MAX96712
  dt-bindings: iio: adi,ltc2983: Fix 64-bit property sizes
  dt-bindings: power: maxim,max17040: Fix incorrect type for 'maxim,rcomp'
  dt-bindings: interrupt-controller: arm,gic-v3: Fix 'interrupts' cell size in example
  dt-bindings: iio/magnetometer: yamaha,yas530: Fix invalid 'interrupts' in example
  dt-bindings: clock: imx5: Drop clock consumer node from example
  dt-bindings: Drop required 'interrupt-parent'
  dt-bindings: net: ti,dp83869: Drop value on boolean 'ti,max-output-impedance'
  dt-bindings: net: wireless: mt76: Fix 8-bit property sizes
  dt-bindings: PCI: snps,dw-pcie-ep: Drop conflicting 'max-functions' schema
  dt-bindings: i2c: st,stm32-i2c: Make each example a separate entry
  dt-bindings: net: stm32-dwmac: Make each example a separate entry
  dt-bindings: net: Cleanup MDIO node schemas
  ...
2022-01-12 16:47:05 -08:00
Linus Torvalds
48a60bdb2b - Add a set of thread_info.flags accessors which snapshot it before
accesing it in order to prevent any potential data races, and convert
 all users to those new accessors
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Merge tag 'core_entry_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull thread_info flag accessor helper updates from Borislav Petkov:
 "Add a set of thread_info.flags accessors which snapshot it before
  accesing it in order to prevent any potential data races, and convert
  all users to those new accessors"

* tag 'core_entry_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  powerpc: Snapshot thread flags
  powerpc: Avoid discarding flags in system_call_exception()
  openrisc: Snapshot thread flags
  microblaze: Snapshot thread flags
  arm64: Snapshot thread flags
  ARM: Snapshot thread flags
  alpha: Snapshot thread flags
  sched: Snapshot thread flags
  entry: Snapshot thread flags
  x86: Snapshot thread flags
  thread_info: Add helpers to snapshot thread flags
2022-01-10 11:34:10 -08:00
Linus Torvalds
9b9e211360 arm64 updates for 5.17:
- KCSAN enabled for arm64.
 
 - Additional kselftests to exercise the syscall ABI w.r.t. SVE/FPSIMD.
 
 - Some more SVE clean-ups and refactoring in preparation for SME support
   (scalable matrix extensions).
 
 - BTI clean-ups (SYM_FUNC macros etc.)
 
 - arm64 atomics clean-up and codegen improvements.
 
 - HWCAPs for FEAT_AFP (alternate floating point behaviour) and
   FEAT_RPRESS (increased precision of reciprocal estimate and reciprocal
   square root estimate).
 
 - Use SHA3 instructions to speed-up XOR.
 
 - arm64 unwind code refactoring/unification.
 
 - Avoid DC (data cache maintenance) instructions when DCZID_EL0.DZP == 1
   (potentially set by a hypervisor; user-space already does this).
 
 - Perf updates for arm64: support for CI-700, HiSilicon PCIe PMU,
   Marvell CN10K LLC-TAD PMU, miscellaneous clean-ups.
 
 - Other fixes and clean-ups; highlights: fix the handling of erratum
   1418040, correct the calculation of the nomap region boundaries,
   introduce io_stop_wc() mapped to the new DGH instruction (data
   gathering hint).
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 updates from Catalin Marinas:

 - KCSAN enabled for arm64.

 - Additional kselftests to exercise the syscall ABI w.r.t. SVE/FPSIMD.

 - Some more SVE clean-ups and refactoring in preparation for SME
   support (scalable matrix extensions).

 - BTI clean-ups (SYM_FUNC macros etc.)

 - arm64 atomics clean-up and codegen improvements.

 - HWCAPs for FEAT_AFP (alternate floating point behaviour) and
   FEAT_RPRESS (increased precision of reciprocal estimate and
   reciprocal square root estimate).

 - Use SHA3 instructions to speed-up XOR.

 - arm64 unwind code refactoring/unification.

 - Avoid DC (data cache maintenance) instructions when DCZID_EL0.DZP ==
   1 (potentially set by a hypervisor; user-space already does this).

 - Perf updates for arm64: support for CI-700, HiSilicon PCIe PMU,
   Marvell CN10K LLC-TAD PMU, miscellaneous clean-ups.

 - Other fixes and clean-ups; highlights: fix the handling of erratum
   1418040, correct the calculation of the nomap region boundaries,
   introduce io_stop_wc() mapped to the new DGH instruction (data
   gathering hint).

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (81 commits)
  arm64: Use correct method to calculate nomap region boundaries
  arm64: Drop outdated links in comments
  arm64: perf: Don't register user access sysctl handler multiple times
  drivers: perf: marvell_cn10k: fix an IS_ERR() vs NULL check
  perf/smmuv3: Fix unused variable warning when CONFIG_OF=n
  arm64: errata: Fix exec handling in erratum 1418040 workaround
  arm64: Unhash early pointer print plus improve comment
  asm-generic: introduce io_stop_wc() and add implementation for ARM64
  arm64: Ensure that the 'bti' macro is defined where linkage.h is included
  arm64: remove __dma_*_area() aliases
  docs/arm64: delete a space from tagged-address-abi
  arm64: Enable KCSAN
  kselftest/arm64: Add pidbench for floating point syscall cases
  arm64/fp: Add comments documenting the usage of state restore functions
  kselftest/arm64: Add a test program to exercise the syscall ABI
  kselftest/arm64: Allow signal tests to trigger from a function
  kselftest/arm64: Parameterise ptrace vector length information
  arm64/sve: Minor clarification of ABI documentation
  arm64/sve: Generalise vector length configuration prctl() for SME
  arm64/sve: Make sysctl interface for SVE reusable by SME
  ...
2022-01-10 08:49:37 -08:00
Greg Kroah-Hartman
2bdf3f9e9d powerpc/cacheinfo: use default_groups in kobj_type
There are currently 2 ways to create a set of sysfs files for a
kobj_type, through the default_attrs field, and the default_groups
field.  Move the powerpc cacheinfo sysfs code to use default_groups
field which has been the preferred way since aa30f47cf666 ("kobject: Add
support for default attribute groups to kobj_type") so that we can soon
get rid of the obsolete default_attrs field.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220104155450.1291277-1-gregkh@linuxfoundation.org
2022-01-05 10:58:23 +11:00
Michael Ellerman
fd1eaaaaa6 powerpc/64s: Use EMIT_WARN_ENTRY for SRR debug warnings
When CONFIG_PPC_RFI_SRR_DEBUG=y we check the SRR values before returning
from interrupts. This is done in asm using EMIT_BUG_ENTRY, and passing
BUGFLAG_WARNING.

However that fails to create an exception table entry for the warning,
and so do_program_check() fails the exception table search and proceeds
to call _exception(), resulting in an oops like:

  Oops: Exception in kernel mode, sig: 5 [#1]
  LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
  Modules linked in:
  CPU: 2 PID: 1204 Comm: sigreturn_unali Tainted: P                  5.16.0-rc2-00194-g91ca3d4f77c5 #12
  NIP:  c00000000000c5b0 LR: 0000000000000000 CTR: 0000000000000000
  ...
  NIP [c00000000000c5b0] system_call_common+0x150/0x268
  LR [0000000000000000] 0x0
  Call Trace:
  [c00000000db73e10] [c00000000000c558] system_call_common+0xf8/0x268 (unreliable)
  ...
  Instruction dump:
  7cc803a6 888d0931 2c240000 4082001c 38800000 988d0931 e8810170 e8a10178
  7c9a03a6 7cbb03a6 7d7a02a6 e9810170 <7f0b6088> 7d7b02a6 e9810178 7f0b6088

We should instead use EMIT_WARN_ENTRY, which creates an exception table
entry for the warning, allowing the warning to be correctly recognised,
and the code to resume after printing the warning.

Note however that because this warning is buried deep in the interrupt
return path, we are not able to recover from it (due to MSR_RI being
clear), so we still end up in die() with an unrecoverable exception.

Fixes: 59dc5bfca0cb ("powerpc/64s: avoid reloading (H)SRR registers if they are still valid")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211221135101.2085547-2-mpe@ellerman.id.au
2021-12-25 10:56:01 +11:00
Michael Ellerman
314f6c23dd powerpc/64s: Mask NIP before checking against SRR0
When CONFIG_PPC_RFI_SRR_DEBUG=y we check that NIP and SRR0 match when
returning from interrupts. This can trigger falsely if NIP has either of
its two low bits set via sigreturn or ptrace, while SRR0 has its low two
bits masked in hardware.

As a quick fix make sure to mask the low bits before doing the check.

Fixes: 59dc5bfca0cb ("powerpc/64s: avoid reloading (H)SRR registers if they are still valid")
Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20211221135101.2085547-1-mpe@ellerman.id.au
2021-12-25 10:55:55 +11:00
Christophe Leroy
bba496656a powerpc/32: Fix boot failure with GCC latent entropy plugin
Boot fails with GCC latent entropy plugin enabled.

This is due to early boot functions trying to access 'latent_entropy'
global data while the kernel is not relocated at its final
destination yet.

As there is no way to tell GCC to use PTRRELOC() to access it,
disable latent entropy plugin in early_32.o and feature-fixups.o and
code-patching.o

Fixes: 38addce8b600 ("gcc-plugins: Add latent_entropy plugin")
Cc: stable@vger.kernel.org # v4.9+
Reported-by: Erhard Furtner <erhard_f@mailbox.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215217
Link: https://lore.kernel.org/r/2bac55483b8daf5b1caa163a45fa5f9cdbe18be4.1640178426.git.christophe.leroy@csgroup.eu
2021-12-23 22:36:58 +11:00
Alexey Kardashevskiy
d51f86cfd8 powerpc/mm: Switch obsolete dssall to .long
The dssall ("Data Stream Stop All") instruction is obsolete altogether
with other Data Cache Instructions since ISA 2.03 (year 2006).

LLVM IAS does not support it but PPC970 seems to be using it.
This switches dssall to .long as there is no much point in fixing LLVM.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211221055904.555763-6-aik@ozlabs.ru
2021-12-23 22:35:13 +11:00
Daniel Axtens
d72c4a36d7 powerpc/64/asm: Do not reassign labels
The LLVM integrated assembler really does not like us reassigning things
to the same label:

<instantiation>:7:9: error: invalid reassignment of non-absolute variable 'fs_label'

This happens across a bunch of platforms:
https://github.com/ClangBuiltLinux/linux/issues/1043
https://github.com/ClangBuiltLinux/linux/issues/1008
https://github.com/ClangBuiltLinux/linux/issues/920
https://github.com/ClangBuiltLinux/linux/issues/1050

There is no hope of getting this fixed in LLVM (see
https://github.com/ClangBuiltLinux/linux/issues/1043#issuecomment-641571200
and https://bugs.llvm.org/show_bug.cgi?id=47798#c1 )
so if we want to build with LLVM_IAS, we need to hack
around it ourselves.

For us the big problem comes from this:

\#define USE_FIXED_SECTION(sname)				\
	fs_label = start_##sname;				\
	fs_start = sname##_start;				\
	use_ftsec sname;

\#define USE_TEXT_SECTION()
	fs_label = start_text;					\
	fs_start = text_start;					\
	.text

and in particular fs_label.

This works around it by not setting those 'variables' and requiring
that users of the variables instead track for themselves what section
they are in. This isn't amazing, by any stretch, but it gets us further
in the compilation.

Note that even though users have to keep track of the section, using
a wrong one produces an error with both binutils and llvm which prevents
from using wrong section at the compile time:

llvm error example:

AS      arch/powerpc/kernel/head_64.o
<unknown>:0: error: Cannot represent a difference across sections
make[3]: *** [/home/aik/p/kernels-llvm/llvm/scripts/Makefile.build:388: arch/powerpc/kernel/head_64.o] Error 1

binutils error example:

/home/aik/p/kernels-llvm/llvm/arch/powerpc/kernel/exceptions-64s.S: Assembler messages:
/home/aik/p/kernels-llvm/llvm/arch/powerpc/kernel/exceptions-64s.S:1974: Error: can't resolve `system_call_common' {.text section} - `start_r
eal_vectors' {.head.text.real_vectors section}
make[3]: *** [/home/aik/p/kernels-llvm/llvm/scripts/Makefile.build:388: arch/powerpc/kernel/head_64.o] Error 1

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211221055904.555763-5-aik@ozlabs.ru
2021-12-23 22:35:12 +11:00
Alexey Kardashevskiy
fd98395797 powerpc/64/asm: Inline BRANCH_TO_C000
It is used just once and does not really help with readability, remove it.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211221055904.555763-4-aik@ozlabs.ru
2021-12-23 22:35:12 +11:00
Alan Modra
a3ad84da07 powerpc/toc: Future proof kernel toc
This patch future-proofs the kernel against linker changes that might
put the toc pointer at some location other than .got+0x8000, by
replacing __toc_start+0x8000 with .TOC. throughout.  If the kernel's
idea of the toc pointer doesn't agree with the linker, bad things
happen.

prom_init.c code relocating its toc is also changed so that a symbolic
__prom_init_toc_start toc-pointer relative address is calculated
rather than assuming that it is always at toc-pointer - 0x8000.  The
length calculations loading values from the toc are also avoided.
It's a little incestuous to do that with unreloc_toc picking up
adjusted values (which is fine in practice, they both adjust by the
same amount if all goes well).

I've also changed the way .got is aligned in vmlinux.lds and
zImage.lds, mostly so that dumping out section info by objdump or
readelf plainly shows the alignment is 256.  This linker script
feature was added 2005-09-27, available in FSF binutils releases from
2.17 onwards.  Should be safe to use in the kernel, I think.

Finally, put *(.got) before the prom_init.o entry which only needs
*(.toc), so that the GOT header goes in the correct place.  I don't
believe this makes any difference for the kernel as it would for
dynamic objects being loaded by ld.so.  That change is just to stop
lusers who blindly copy kernel scripts being led astray.  Of course,
this change needs the prom_init.c changes.

Some notes on .toc and .got.

.toc is a compiler generated section of addresses.  .got is a linker
generated section of addresses, generally built when the linker sees
R_*_*GOT* relocations.  In the case of powerpc64 ld.bfd, there are
multiple generated .got sections, one per input object file.  So you
can somewhat reasonably write in a linker script an input section
statement like *prom_init.o(.got .toc) to mean "the .got and .toc
section for files matching *prom_init.o".  On other architectures that
doesn't make sense, because the linker generally has just one .got
section.  Even on powerpc64, note well that the GOT entries for
prom_init.o may be merged with GOT entries from other objects.  That
means that if prom_init.o references, say, _end via some GOT
relocation, and some other object also references _end via a GOT
relocation, the GOT entry for _end may be in the range
__prom_init_toc_start to __prom_init_toc_end and if the kernel does
something special to GOT/TOC entries in that range then the value of
_end as seen by objects other than prom_init.o will be affected.  On
the other hand the GOT entry for _end may not be in the range
__prom_init_toc_start to __prom_init_toc_end.  Which way it turns out
is deterministic but a detail of linker operation that should not be
relied on.

A feature of ld.bfd is that input .toc (and .got) sections matching
one linker input section statement may be sorted, to put entries used
by small-model code first, near the toc base.  This is why scripts for
powerpc64 normally use *(.got .toc) rather than *(.got) *(.toc), since
the first form allows more freedom to sort.

Another feature of ld.bfd is that indirect addressing sequences using
the GOT/TOC may be edited by the linker to relative addressing.  In
many cases relative addressing would be emitted by gcc for
-mcmodel=medium if you appropriately decorate variable declarations
with non-default visibility.

The original patch is here:
https://lore.kernel.org/linuxppc-dev/20210310034813.GM6042@bubble.grove.modra.org/

Signed-off-by: Alan Modra <amodra@au1.ibm.com>
[aik: removed non-relocatable which is gone in 24d33ac5b8ffb]
[aik: added <=2.24 check]
[aik: because of llvm-as, kernel_toc_addr() uses "mr" instead of global register variable]
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211221055904.555763-2-aik@ozlabs.ru
2021-12-23 22:35:01 +11:00
Nick Child
d276960d92 powerpc/kernel: Add __init attribute to eligible functions
Some functions defined in `arch/powerpc/kernel` (and one in `arch/powerpc/
kexec`) are deserving of an `__init` macro attribute. These functions are
only called by other initialization functions and therefore should inherit
the attribute.
Also, change function declarations in header files to include `__init`.

Signed-off-by: Nick Child <nick.child@ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211216220035.605465-2-nick.child@ibm.com
2021-12-23 22:33:10 +11:00
Linus Torvalds
713ab911f2 powerpc fixes for 5.16 #4
Fix a recently introduced oops at boot on 85xx in some configurations.
 
 Fix crashes when loading some livepatch modules with STRICT_MODULE_RWX.
 
 Thanks to: Joe Lawrence, Russell Currey, Xiaoming Ni.
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Merge tag 'powerpc-5.16-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Fix a recently introduced oops at boot on 85xx in some configurations.

  Fix crashes when loading some livepatch modules with
  STRICT_MODULE_RWX.

  Thanks to Joe Lawrence, Russell Currey, and Xiaoming Ni"

* tag 'powerpc-5.16-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/module_64: Fix livepatching for RO modules
  powerpc/85xx: Fix oops when CONFIG_FSL_PMC=n
2021-12-19 11:31:14 -08:00
Rob Herring
1f012283e9 of/fdt: Rework early_init_dt_scan_memory() to call directly
Use of the of_scan_flat_dt() function predates libfdt and is discouraged
as libfdt provides a nicer set of APIs. Rework
early_init_dt_scan_memory() to be called directly and use libfdt.

Cc: John Crispin <john@phrozen.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: linux-mips@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211215150102.1303588-1-robh@kernel.org
2021-12-16 16:07:52 -06:00
Rob Herring
d665881d21 of/fdt: Rework early_init_dt_scan_root() to call directly
Use of the of_scan_flat_dt() function predates libfdt and is discouraged
as libfdt provides a nicer set of APIs. Rework early_init_dt_scan_root()
to be called directly and use libfdt.

Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Link: https://lore.kernel.org/r/20211118181213.1433346-3-robh@kernel.org
2021-12-16 16:07:48 -06:00
Rob Herring
60f20d84dc of/fdt: Rework early_init_dt_scan_chosen() to call directly
Use of the of_scan_flat_dt() function predates libfdt and is discouraged
as libfdt provides a nicer set of APIs. Rework
early_init_dt_scan_chosen() to be called directly and use libfdt.

Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Link: https://lore.kernel.org/r/20211118181213.1433346-2-robh@kernel.org
2021-12-16 16:07:41 -06:00
Nicholas Piggin
af47d79b04 powerpc/64s/interrupt: avoid saving CFAR in some asynchronous interrupts
Reading the CFAR register is quite costly (~20 cycles on POWER9). It is
a good idea to have for most synchronous interrupts, but for async ones
it is much less important.

Doorbell, external, and decrementer interrupts are the important
asynchronous ones. HV interrupts can't skip CFAR if KVM HV is possible,
because it might be a guest exit that requires CFAR preserved. But the
important pseries interrupts can avoid loading CFAR.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210922145452.352571-7-npiggin@gmail.com
2021-12-16 21:31:45 +11:00
Nicholas Piggin
0faf20a1ad powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use
Enabling MSR[EE] in interrupt handlers while interrupts are still soft
masked allows PMIs to profile interrupt handlers to some degree, beyond
what SIAR latching allows.

When perf is not being used, this is almost useless work. It requires an
extra mtmsrd in the irq handler, and it also opens the door to masked
interrupts hitting and requiring replay, which is more expensive than
just taking them directly. This effect can be noticable in high IRQ
workloads.

Avoid enabling MSR[EE] unless perf is currently in use. This saves about
60 cycles (or 8%) on a simple decrementer interrupt microbenchmark.
Replayed interrupts drop from 1.4% of all interrupts taken, to 0.003%.

This does prevent the soft-nmi interrupt being taken in these handlers,
but that's not too reliable anyway. The SMP watchdog will continue to be
the reliable way to catch lockups.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210922145452.352571-5-npiggin@gmail.com
2021-12-16 21:31:45 +11:00