This enables new registers, LMRR and LMSER, that can trigger an EBB in
userspace code when a monitored load (via the new ldmx instruction)
loads memory from a monitored space. This facility is controlled by a
new FSCR bit, LM.

This patch disables the FSCR LM control bit on task init and enables
that bit when a load monitor facility unavailable exception is taken
for using it. On context switch, this bit is then used to determine
whether the two relevant registers are saved and restored. This is
done lazily for performance reasons.
Signed-off-by: NJack Miller <jack@codezen.org>
Signed-off-by: NMichael Neuling <mikey@neuling.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

This fixes a few issues with FSCR init and switching.

In commit 152d523e ("powerpc: Create context switch helpers
save_sprs() and restore_sprs()") we moved the setting of the FSCR
register from inside an CPU_FTR_ARCH_207S section to inside just a
CPU_FTR_ARCH_DSCR section. Hence we are setting FSCR on POWER6/7 where
the FSCR doesn't exist. This is harmless but we shouldn't do it.

Also, we can simplify the FSCR context switch. We don't need to go
through the calculation involving dscr_inherit. We can just restore
what we saved last time.

We also set an initial value in INIT_THREAD, so that pid 1 which is
cloned from that gets a sane value.

Based on patch by Jack Miller.
Signed-off-by: NMichael Neuling <mikey@neuling.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Current comment in the early_setup_secondary() for paca->soft_enabled
update is misleading. Comment should say to Mark interrupts "disabled"
instead of "enabled". Fix the typo.
Signed-off-by: NMadhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Fixes the following testsuite failure:

  $ sudo ./perf test -v kallsyms
   1: vmlinux symtab matches kallsyms                          :
  --- start ---
  test child forked, pid 12489
  Using /proc/kcore for kernel object code
  Looking at the vmlinux_path (8 entries long)
  Using /boot/vmlinux for symbols
  0xc00000000003d300: diff name v: .kretprobe_trampoline_holder k: kretprobe_trampoline
  Maps only in vmlinux:
   c00000000086ca38-c000000000879b6c 87ca38 [kernel].text.unlikely
   c000000000879b6c-c000000000bf0000 889b6c [kernel].meminit.text
   c000000000bf0000-c000000000c53264 c00000 [kernel].init.text
   c000000000c53264-d000000004250000 c63264 [kernel].exit.text
   d000000004250000-d000000004450000 0 [libcrc32c]
   d000000004450000-d000000004620000 0 [xfs]
   d000000004620000-d000000004680000 0 [autofs4]
   d000000004680000-d0000000046e0000 0 [x_tables]
   d0000000046e0000-d000000004780000 0 [ip_tables]
   d000000004780000-d0000000047e0000 0 [rng_core]
   d0000000047e0000-ffffffffffffffff 0 [pseries_rng]
  Maps in vmlinux with a different name in kallsyms:
  Maps only in kallsyms:
   d000000000000000-f000000000000000 1000000000010000 [kernel.kallsyms]
   f000000000000000-ffffffffffffffff 3000000000010000 [kernel.kallsyms]
  test child finished with -1
  ---- end ----
  vmlinux symtab matches kallsyms: FAILED!

The problem is that the kretprobe_trampoline symbol looks like this:

  $ eu-readelf -s /boot/vmlinux G kretprobe_trampoline
   2431: c000000001302368     24 NOTYPE  LOCAL  DEFAULT       37 kretprobe_trampoline_holder
   2432: c00000000003d300      8 FUNC    LOCAL  DEFAULT        1 .kretprobe_trampoline_holder
  97543: c00000000003d300      0 NOTYPE  GLOBAL DEFAULT        1 kretprobe_trampoline

Its type is NOTYPE, and its size is 0, and this is a problem because
symbol-elf.c:dso__load_sym skips function symbols that are not STT_FUNC
or STT_GNU_IFUNC (this is determined by elf_sym__is_function). Even
if the type is changed to STT_FUNC, when dso__load_sym calls
symbols__fixup_duplicate, the kretprobe_trampoline symbol is dropped in
favour of .kretprobe_trampoline_holder because the latter has non-zero
size (as determined by choose_best_symbol).

With this patch, all vmlinux symbols match /proc/kallsyms and the
testcase passes.

Commit c1c355ce ("x86/kprobes: Get rid of
kretprobe_trampoline_holder()") gets rid of kretprobe_trampoline_holder
altogether on x86. This commit does the same on powerpc. This change
introduces no regressions on the perf and ftracetest testsuite results.
Reviewed-by: NNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: NThiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

On Book3E CPUs (and possibly other configs), it is possible to have SRIOV
(CONFIG_PCI_IOV) set without CONFIG_EEH.  The SRIOV code does not check
for this, and if EEH is disabled, pci_dn.c fails to build.

Fix this by gating the EEH-specific code in the SRIOV implementation
behind CONFIG_EEH.

Fixes: 39218cd0 ("powerpc/eeh: EEH device for VF")
Reported-by: NMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: NRussell Currey <ruscur@russell.cc>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Sparse complains that it doesn't know what REG_BYTE is:

  arch/powerpc/kernel/align.c:313:29: error: undefined identifier 'REG_BYTE'

REG_BYTE is defined differently based on whether we're compiling for
LE, BE32 or BE64. Sparse apparently doesn't provide __BIG_ENDIAN__ or
__LITTLE_ENDIAN__, which means we get no definition.

Rather than check for __BIG_ENDIAN__ and then separately for
__LITTLE_ENDIAN__, just switch the #ifdef to check for __BIG_ENDIAN__
and then #else we define the little endian version. Technically that's
dicey because PDP_ENDIAN is also a possibility, but we already do it in
a lot of places so one more hardly matters.
Signed-off-by: NDaniel Axtens <dja@axtens.net>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Sometimes headers that provide prototypes for functions are
accidentally omitted from the files that define the functions.

Fix a couple of times that occurs.
Signed-off-by: NDaniel Axtens <dja@axtens.net>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Sparse picked up a number of functions that are implemented in C and
then only referred to in asm code.

This introduces asm-prototypes.h, which provides a place for
prototypes of these functions.

This silences some sparse warnings.
Signed-off-by: NDaniel Axtens <dja@axtens.net>
[mpe: Add include guards, clean up copyright & GPL text]
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

This is just a smattering of things picked up by sparse that should
be made static.
Signed-off-by: NDaniel Axtens <dja@axtens.net>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

The array crash_shutdown_handles is an array of size CRASH_HANDLER_MAX+1
containing up to CRASH_HANDLER_MAX shutdown_handlers. It is assumed to
be NULL terminated, which it is under normal circumstances. Array
accesses in the functions crash_shutdown_unregister() and
default_machine_crash_shutdown() rely on this NULL termination property
when traversing this list and don't protect again out of bounds accesses.
If the NULL terminator were somehow overwritten these functions could
potentially access out of the bounds of the array.

Shrink the array to size CRASH_HANDLER_MAX and implement explicit array
bounds checking when accessing the elements of the
crash_shutdown_handles[] array in crash_shutdown_unregister() and
default_machine_crash_shutdown().
Signed-off-by: NSuraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

THREAD_DSCR:
  Added in efcac658 "powerpc: Per process DSCR + some fixes (try#4)"
  Last usage removed in 152d523e "powerpc: Create context switch helpers save_sprs() and restore_sprs()"

THREAD_DSCR_INHERIT:
  Added in 71433285 "powerpc: Restore correct DSCR in context switch"
  Last usage removed in 152d523e "powerpc: Create context switch helpers save_sprs() and restore_sprs()"

THREAD_TAR:
  Added in 2468dcf6 "powerpc: Add support for context switching the TAR register"
  Last usage removed in 152d523e "powerpc: Create context switch helpers save_sprs() and restore_sprs()"

THREAD_BESCR, THREAD_EBBHR and THREAD_EBBRR:
  Added in 9353374b "powerpc: Context switch the new EBB SPRs"
  Last usage removed in 152d523e "powerpc: Create context switch helpers save_sprs() and restore_sprs()"

THREAD_SIAR, THREAD_SDAR, THREAD_SIER, THREAD_MMCR0, and THREAD_MMCR2:
  Added in 59affcd3 "powerpc: Context switch more PMU related SPRs"
  Last usage removed in b11ae951 "powerpc: Partial revert of "Context switch more PMU related SPRs""

PACA_LOCK_TOKEN:
  Added in 9e368f29 "KVM: PPC: book3s_hv: Add support for PPC970-family processors"
  Last usage removed in c17b98cf "KVM: PPC: Book3S HV: Remove code for PPC970 processors"

HCALL_STAT_SIZE, HCALL_STAT_CALLS, HCALL_STAT_TB and HCALL_STAT_PURR:
  Added in 57852a85 "[POWERPC] powerpc: Instrument Hypervisor Calls"
  Last usage removed in c8cd093a "powerpc: tracing: Add hypervisor call tracepoints"

VCPU_EPLC:
  Added in d30f6e48 "KVM: PPC: booke: category E.HV (GS-mode) support"
  Never used.

CPU_DOWN_FLUSH:
  Added in e7affb1d "powerpc/cache: add cache flush operation for various e500"
  Never used.

CFG_STAMP_XSEC:
  Added in 14cf11af "powerpc: Merge enough to start building in arch/powerpc."
  Last usage removed in 0e469db8 "powerpc: Rework VDSO gettimeofday to prevent time going backwards"

KVM_LPCR:
  Added in aa04b4cc "KVM: PPC: Allocate RMAs (Real Mode Areas) at boot for use by guests"
  Last usage removed in a0144e2a "KVM: PPC: Book3S HV: Store LPCR value for each virtual core"

GPR15, GPR16, GPR17, GPR18, GPR19, GPR20, GPR21, GPR22, GPR23, GPR24,
GPR25, GPR26, GPR27, GPR28, GPR29, GPR30 and GPR31:
  Added in 14cf11af "powerpc: Merge enough to start building in arch/powerpc."
  Never used.

VCPU_SHADOW_FSCR:
  Added in 616dff86 "KVM: PPC: Book3S PR: Handle Facility interrupt and FSCR"
  Never used.

VCPU_SHADOW_SRR1:
  Added in a2d56020 "KVM: PPC: Book3S PR: Keep volatile reg values in vcpu rather than shadow_vcpu"
  Never used.

KVM_SPLIT_SIZE:
  Added in b4deba5c "KVM: PPC: Book3S HV: Implement dynamicmicro-threading on POWER8"
  Never used.

VCPU_VCPUID:
  Added in de56a948 "KVM: PPC: Add support for Book3S processors in hypervisor mode"
  Last usage removed 1b400ba0 "KVM: PPC: Book3S HV: Improve handling of local vs. global TLB invalidations"

_MQ:
  Added in 14cf11af "powerpc: Merge enough to start building in arch/powerpc."
  Never used.

AUDITCONTEXT:
  Added in 14cf11af "powerpc: Merge enough to start building in arch/powerpc."
  Last usage removed in 401d1f02 "[PATCH] syscall entry/exit revamp"

CLONE_VM:
  Added in 14cf11af "powerpc: Merge enough to start building in arch/powerpc."
  Currently unused.

CLONE_UNTRACED:
  Added in 14cf11af "powerpc: Merge enough to start building in arch/powerpc."
  Currently unused.
Signed-off-by: NRashmica Gupta <rashmicy@gmail.com>
[mpe: Munge change log]
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Signed-off-by: NGreg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

We're approaching 20 locations where we need to check for ELF ABI v2.
That's fine, except the logic is a bit awkward, because we have to check
that _CALL_ELF is defined and then what its value is.

So check it once in asm/types.h and define PPC64_ELF_ABI_v2 when ELF ABI
v2 is detected.

We also have a few places where what we're really trying to check is
that we are using the 64-bit v1 ABI, ie. function descriptors. So also
add a #define for that, which simplifies several checks.
Signed-off-by: NNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Signed-off-by: NAndrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

sub_reloc_offset() has not been used since commit
917f0af9 ("powerpc: Remove arch/ppc and include/asm-ppc") which
removed include/asm-ppc/prom.h.
Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

In setup_sigcontext(), we set current->thread.vrsave then use it
straight after. Since current is hidden from the compiler via inline
assembly, it cannot optimise this and we end up with a load hit store.

Fix this by using a temporary.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

In both __giveup_fpu() and __giveup_altivec() we make two modifications
to tsk->thread.regs->msr. gcc decides to do a read/modify/write of
each change, so we end up with a load hit store:

        ld      r9,264(r10)
        rldicl  r9,r9,50,1
        rotldi  r9,r9,14
        std     r9,264(r10)
...
        ld      r9,264(r10)
        rldicl  r9,r9,40,1
        rotldi  r9,r9,24
        std     r9,264(r10)

Fix this by using a temporary.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

The recent commit 7cc85103 ("powerpc/pseries: Add POWER8NVL support
to ibm,client-architecture-support call") added a new PVR mask & value
to the start of the ibm_architecture_vec[] array.

However it missed the fact that further down in the array, we hard code
the offset of one of the fields, and then at boot use that value to
patch the value in the array. This means every update to the array must
also update the #define, ugh.

This means that on pseries machines we will misreport to firmware the
number of cores we support, by a factor of threads_per_core.

Fix it for now by updating the #define.

Fixes: 7cc85103 ("powerpc/pseries: Add POWER8NVL support to ibm,client-architecture-support call")
Cc: stable@vger.kernel.org # v4.0+
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

gcc-6 correctly warns about a out of bounds access

arch/powerpc/kernel/ptrace.c:407:24: warning: index 32 denotes an offset greater than size of 'u64[32][1] {aka long long unsigned int[32][1]}' [-Warray-bounds]
        offsetof(struct thread_fp_state, fpr[32][0]));
                        ^

check the end of array instead of beginning of next element to fix this
Signed-off-by: NKhem Raj <raj.khem@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Tested-by: NAaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: NOlof Johansson <olof@lixom.net>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

If we do not provide the PVR for POWER8NVL, a guest on this system
currently ends up in PowerISA 2.06 compatibility mode on KVM, since QEMU
does not provide a generic PowerISA 2.07 mode yet. So some new
instructions from POWER8 (like "mtvsrd") get disabled for the guest,
resulting in crashes when using code compiled explicitly for
POWER8 (e.g. with the "-mcpu=power8" option of GCC).

Fixes: ddee09c0 ("powerpc: Add PVR for POWER8NVL processor")
Cc: stable@vger.kernel.org # v4.0+
Signed-off-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

most architectures are relying on mmap_sem for write in their
arch_setup_additional_pages.  If the waiting task gets killed by the oom
killer it would block oom_reaper from asynchronous address space reclaim
and reduce the chances of timely OOM resolving.  Wait for the lock in
the killable mode and return with EINTR if the task got killed while
waiting.
Signed-off-by: NMichal Hocko <mhocko@suse.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>	[x86 vdso]
Acked-by: NVlastimil Babka <vbabka@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Define HAVE_EXIT_THREAD for archs which want to do something in
exit_thread. For others, let's define exit_thread as an empty inline.

This is a cleanup before we change the prototype of exit_thread to
accept a task parameter.

[akpm@linux-foundation.org: fix mips]
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chen Liqin <liqin.linux@gmail.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: David Howells <dhowells@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Steven Miao <realmz6@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This reverts commit 89a51df5.

The function eeh_add_device_early() is used to perform EEH
initialization in devices added later on the system, like in
hotplug/DLPAR scenarios. Since the commit 89a51df5 ("powerpc/eeh:
Fix crash in eeh_add_device_early() on Cell") a new check was introduced
in this function - Cell has no EEH capabilities which led to kernel oops
if hotplug was performed, so checking for eeh_enabled() was introduced
to avoid the issue.

However, in architectures that EEH is present like pSeries or PowerNV,
we might reach a case in which no PCI devices are present on boot time
and so EEH is not initialized. Then, if a device is added via DLPAR for
example, eeh_add_device_early() fails because eeh_enabled() is false,
and EEH end up not being enabled at all.

This reverts the aforementioned patch since a new verification was
introduced by the commit d91dafc0 ("powerpc/eeh: Delay probing EEH
device during hotplug") and so the original Cell issue does not happen
anymore.

Cc: stable@vger.kernel.org # v4.1+
Reviewed-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: NGuilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

The label "reset" in eeh_pe_change_owner() is used only for once.
No need to keep it and just drop it. No logical changes introduced.
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au>
Reviewed-by: NRussell Currey <ruscur@russell.cc>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

The function eeh_pe_reset_and_recover() is used to recover EEH
error when the passthrough device are transferred to guest and
backwards, meaning the device's driver is vfio-pci or none. In
both cases, the handlers triggered by eeh_report_reset() and
eeh_report_resume() shouldn't be called.

This ignores the error handlers from eeh_report_reset() and
eeh_report_resume().
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: NRussell Currey <ruscur@russell.cc>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

The function eeh_pe_reset_and_recover() is used to recover EEH
error when the passthrou device are transferred to guest and
backwards. The content in the device's config space will be lost
on PE reset issued in the middle of the recovery. The function
saves/restores it before/after the reset. However, config access
to some adapters like Broadcom BCM5719 at this point will causes
fenced PHB. The config space is always blocked and we save 0xFF's
that are restored at late point. The memory BARs are totally
corrupted, causing another EEH error upon access to one of the
memory BARs.

This restores the config space on those adapters like BCM5719
from the content saved to the EEH device when it's populated,
to resolve above issue.

Fixes: 5cfb20b9 ("powerpc/eeh: Emulate EEH recovery for VFIO devices")
Cc: stable@vger.kernel.org #v3.18+
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: NRussell Currey <ruscur@russell.cc>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

The function eeh_pe_reset_and_recover() is used to recover EEH
error when the passthrough device are transferred to guest and
backwards, meaning the device's driver is vfio-pci or none.
When the driver is vfio-pci that provides error_detected() error
handler only, the handler simply stops the guest and it's not
expected behaviour. On the other hand, no error handlers will
be called if we don't have a bound driver.

This ignores the error handler in eeh_pe_reset_and_recover()
that reports the error to device driver to avoid the exceptional
behaviour.

Fixes: 5cfb20b9 ("powerpc/eeh: Emulate EEH recovery for VFIO devices")
Cc: stable@vger.kernel.org #v3.18+
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: NRussell Currey <ruscur@russell.cc>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

In hotplug case, function pci_add_pci_devices() is called to rescan
the specified PCI bus, which might not have any child devices. Access
to the PCI bus's child device node will cause kernel crash without
exception.

This adds one more check to skip scanning PCI bus that doesn't have
any subordinate devices from device-tree, in order to avoid kernel
crash.
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

This renames traverse_pci_devices() to pci_traverse_device_nodes().
The function traverses all subordinate device nodes of the specified
one. Also, below cleanup applied to the function. No logical changes
introduced.

   * Rename "pre" to "fn".
   * Avoid assignment in if condition reported from checkpatch.pl.
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

This implements and exports pci_remove_device_node_info(). It's
used to remove the pdn (struct pci_dn) for the indicated device
node. The function is going to be used by PowerNV PCI hotplug
driver.
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

This renames update_dn_pci_info() to pci_add_device_node_info()
with corresponding adjustment on the parameter type and exports it.
The function is used to create pdn (struct pci_dn) for the indicated
device node. Another function add_pdn(), almost wrapper of
pci_add_device_node_info(), to be used in traverse_pci_devices(). No
logical changes introduced.
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

This moves pci_find_bus_by_node() from arch/powerpc/platforms/
pseries/pci_dlpar.c to arch/powerpc/kernel/pci-hotplug.c so that
the function can be used by pSeries and PowerNV platform at the
same time. Also, below cleanup applied. No functional changes
introduced.

   * Remove variable "busdn" in find_bus_among_children()
   * Use PCI_DN() to convert device node to pci_dn
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: NAndrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

This renames pcibios_{add,remove}_pci_devices() to avoid conflicts
with names of the weak functions in PCI subsystem, which have the
prefix "pcibios". No logical changes introduced.
Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-By: NAlistair Popple <alistair@popple.id.au>
Reviewed-by: NAndrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

The routine machine_check_pSeries_early() is only used on powernv, not
pseries. Hence rename machine_check_pSeries_early() to
machine_check_powernv_early().
Reported-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

After obtaining a property from of_find_property() and before calling
of_remove_property() most code checks to ensure that the property
returned from of_find_property() is not null. The previous patch moved
this check to the start of the function of_remove_property() in order to
avoid the case where this check isn't done and a null value is passed.
This ensures the check is always conducted before taking locks and
attempting to remove the property. Thus it is no longer necessary to
perform a check for null values before invoking of_remove_property().

Update of_remove_property() call sites in order to remove redundant
checking for null property value as check is now performed within the
of_remove_property function().
Signed-off-by: NSuraj Jitindar Singh <sjitindarsingh@gmail.com>
[mpe: Unbreak some lines which are just >80 chars for readability]
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

The code in machine_restart/power_off/halt() includes #ifdefs around
calls to smp_send_stop(), however these are not required as
include/linux/smp.h includes an empty version of this function for
CONFIG_SMP=n builds.
Signed-off-by: NChris Smart <chris@distroguy.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

Support for the A2 cpu was removed in commit fb5a5157 ("powerpc:
Remove platforms/wsp and associated pieces"), and the externs:
__setup_cpu_a2 and __restore_cpu_a2 are still around and unused, so
remove them.
Signed-off-by: NRashmica Gupta <rashmicy@gmail.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

It's CONFIG_PPC_STD_MMU_64 not ...
     CONFIG_PPC_MMU_STD_64.

Fixes: 11ffc1cfa4c2 ("powerpc/mm/radix: Use STD_MMU_64 to properly isolate hash related code")
Signed-off-by: NValentin Rothberg <valentinrothberg@gmail.com>
Reviewed-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

We use the existing "ibm,pa-features" device-tree property to enable
Radix MMU mode. This means we default to hash mode unless firmware tells
us it's OK to start using Radix mode.
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

With 4K page size radix config our level 1 page table size is 64K and it
should be naturally aligned.
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>