openwrt/staging/blogic.git
7 years agopowerpc/opal: Fix EBUSY bug in acquiring tokens
William A. Kennington III [Fri, 22 Sep 2017 23:58:00 +0000 (16:58 -0700)]
powerpc/opal: Fix EBUSY bug in acquiring tokens

The current code checks the completion map to look for the first token
that is complete. In some cases, a completion can come in but the
token can still be on lease to the caller processing the completion.
If this completed but unreleased token is the first token found in the
bitmap by another tasks trying to acquire a token, then the
__test_and_set_bit call will fail since the token will still be on
lease. The acquisition will then fail with an EBUSY.

This patch reorganizes the acquisition code to look at the
opal_async_token_map for an unleased token. If the token has no lease
it must have no outstanding completions so we should never see an
EBUSY, unless we have leased out too many tokens. Since
opal_async_get_token_inrerruptible is protected by a semaphore, we
will practically never see EBUSY anymore.

Fixes: 8d7248232208 ("powerpc/powernv: Infrastructure to support OPAL async completion")
Signed-off-by: William A. Kennington III <wak@google.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/eeh: Stop using do_gettimeofday()
Arnd Bergmann [Sat, 4 Nov 2017 21:26:52 +0000 (22:26 +0100)]
powerpc/eeh: Stop using do_gettimeofday()

This interface is inefficient and deprecated because of the y2038
overflow.

ktime_get_seconds() is an appropriate replacement here, since it
has sufficient granularity but is more efficient and uses monotonic
time.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agocxl: Rework the implementation of cxl_stop_trace_psl9()
Vaibhav Jain [Wed, 11 Oct 2017 12:30:20 +0000 (18:00 +0530)]
cxl: Rework the implementation of cxl_stop_trace_psl9()

Presently the PSL9 specific cxl_stop_trace_psl9() only stops the RX0
traces on the CXL adapter when a PSL error irq is triggered. The patch
updates the function to stop all the traces arrays and move them to
the FIN state. The implementation issues the mmio to TRACECFG register
to stop the trace array iff it already not in FIN state. This prevents
the issue of trace data being reset in case of multiple stop mmio
issued for a single trace array.

Also the patch does some refactoring of existing cxl_stop_trace_psl9()
and cxl_stop_trace_psl8() functions by moving them to 'pci.c' from
'debugfs.c' file and marking them as static.

Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agobpf: take advantage of stack_depth tracking in powerpc JIT
Sandipan Das [Fri, 1 Sep 2017 18:53:01 +0000 (00:23 +0530)]
bpf: take advantage of stack_depth tracking in powerpc JIT

Take advantage of stack_depth tracking, originally introduced for
x64, in powerpc JIT as well. Round up allocated stack by 16 bytes
to make sure it stays aligned for functions called from JITed bpf
program.

Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/tm: Don't check for WARN in TM Bad Thing handling
Michael Ellerman [Thu, 12 Oct 2017 04:45:25 +0000 (15:45 +1100)]
powerpc/tm: Don't check for WARN in TM Bad Thing handling

Currently when we take a TM Bad Thing program check exception, we
search the bug table to see if the program check was generated by a
WARN/WARN_ON etc.

That makes no sense, the WARN macros use trap instructions, which
should never generate a TM Bad Thing exception. If they ever did that
would be a bug and we should oops.

We do have some hand-coded bugs in tm.S, using EMIT_BUG_ENTRY, but
those are all BUGs not WARNs, and they all use trap instructions
anyway. Almost certainly this check was incorrectly copied from the
REASON_TRAP handling in the same function.

Remove it.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-By: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mm: Add a CONFIG option to choose if radix is used by default
Michael Ellerman [Tue, 24 Oct 2017 15:48:49 +0000 (17:48 +0200)]
powerpc/mm: Add a CONFIG option to choose if radix is used by default

Currently if the hardware supports the radix MMU we will use
it, *unless* "disable_radix" is passed on the kernel command line.

However some users would like the reverse semantics. ie. The kernel
uses the hash MMU by default, unless radix is explicitly requested on
the command line.

So add a CONFIG option to choose whether we use radix by default or
not, and expand the disable_radix command line option to allow
"disable_radix=no" which *enables* radix.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/64s: Replace CONFIG_PPC_STD_MMU_64 with CONFIG_PPC_BOOK3S_64
Michael Ellerman [Thu, 19 Oct 2017 04:08:43 +0000 (15:08 +1100)]
powerpc/64s: Replace CONFIG_PPC_STD_MMU_64 with CONFIG_PPC_BOOK3S_64

CONFIG_PPC_STD_MMU_64 indicates support for the "standard" powerpc MMU
on 64-bit CPUs. The "standard" MMU refers to the hash page table MMU
found in "server" processors, from IBM mainly.

Currently CONFIG_PPC_STD_MMU_64 is == CONFIG_PPC_BOOK3S_64. While it's
annoying to have two symbols that always have the same value, it's not
quite annoying enough to bother removing one.

However with the arrival of Power9, we now have the situation where
CONFIG_PPC_STD_MMU_64 is enabled, but the kernel is running using the
Radix MMU - *not* the "standard" MMU. So it is now actively confusing
to use it, because it implies that code is disabled or inactive when
the Radix MMU is in use, however that is not necessarily true.

So s/CONFIG_PPC_STD_MMU_64/CONFIG_PPC_BOOK3S_64/, and do some minor
formatting updates of some of the affected lines.

This will be a pain for backports, but c'est la vie.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/64: Free up CPU_FTR_ICSWX
Michael Ellerman [Thu, 19 Oct 2017 04:08:19 +0000 (15:08 +1100)]
powerpc/64: Free up CPU_FTR_ICSWX

The last user of CPU_FTR_ICSWX was removed in commit
6ff4d3e96652 ("powerpc: Remove old unused icswx based coprocessor
support"), so free the bit up for future use.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mm/hash: Add pr_fmt() to hash_utils64.c
Aneesh Kumar K.V [Mon, 16 Oct 2017 07:01:40 +0000 (12:31 +0530)]
powerpc/mm/hash: Add pr_fmt() to hash_utils64.c

Make the printks look a bit nicer by adding a prefix.

Radix config now do
 radix-mmu: Page sizes from device-tree:
 radix-mmu: Page size shift = 12 AP=0x0
 radix-mmu: Page size shift = 16 AP=0x5
 radix-mmu: Page size shift = 21 AP=0x1
 radix-mmu: Page size shift = 30 AP=0x2

This patch update hash config to do similar dmesg output. With the patch we have

 hash-mmu: Page sizes from device-tree:
 hash-mmu: base_shift=12: shift=12, sllp=0x0000, avpnm=0x00000000, tlbiel=1, penc=0
 hash-mmu: base_shift=12: shift=16, sllp=0x0000, avpnm=0x00000000, tlbiel=1, penc=7
 hash-mmu: base_shift=12: shift=24, sllp=0x0000, avpnm=0x00000000, tlbiel=1, penc=56
 hash-mmu: base_shift=16: shift=16, sllp=0x0110, avpnm=0x00000000, tlbiel=1, penc=1
 hash-mmu: base_shift=16: shift=24, sllp=0x0110, avpnm=0x00000000, tlbiel=1, penc=8
 hash-mmu: base_shift=20: shift=20, sllp=0x0111, avpnm=0x00000000, tlbiel=0, penc=2
 hash-mmu: base_shift=24: shift=24, sllp=0x0100, avpnm=0x00000001, tlbiel=0, penc=0
 hash-mmu: base_shift=34: shift=34, sllp=0x0120, avpnm=0x000007ff, tlbiel=0, penc=3

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/ipic: Fix status get and status clear
Christophe Leroy [Wed, 18 Oct 2017 09:16:47 +0000 (11:16 +0200)]
powerpc/ipic: Fix status get and status clear

IPIC Status is provided by register IPIC_SERSR and not by IPIC_SERMR
which is the mask register.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/powernv: Reserve a hole which appears after enabling IOV
Alexey Kardashevskiy [Wed, 27 Sep 2017 06:52:31 +0000 (16:52 +1000)]
powerpc/powernv: Reserve a hole which appears after enabling IOV

In order to make generic IOV code work, the physical function IOV BAR
should start from offset of the first VF. Since M64 segments share
PE number space across PHB, and some PEs may be in use at the time
when IOV is enabled, the existing code shifts the IOV BAR to the index
of the first PE/VF. This creates a hole in IOMEM space which can be
potentially taken by some other device.

This reserves a temporary hole on a parent and releases it when IOV is
disabled; the temporary resources are stored in pci_dn to avoid
kmalloc/free.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/pseries/vio: Dispose of virq mapping on vdevice unregister
Tyrel Datwyler [Fri, 29 Sep 2017 00:19:20 +0000 (20:19 -0400)]
powerpc/pseries/vio: Dispose of virq mapping on vdevice unregister

When a vdevice is DLPAR removed from the system the vio subsystem
doesn't bother unmapping the virq from the irq_domain. As a result we
have a virq mapped to a hardware irq that is no longer valid for the
irq_domain. A side effect is that we are left with /proc/irq/<irq#>
affinity entries, and attempts to modify the smp_affinity of the irq
will fail.

In the following observed example the kernel log is spammed by
ics_rtas_set_affinity errors after the removal of a VSCSI adapter.
This is a result of irqbalance trying to adjust the affinity every 10
seconds.

  rpadlpar_io: slot U8408.E8E.10A7ACV-V5-C25 removed
  ics_rtas_set_affinity: ibm,set-xive irq=655385 returns -3
  ics_rtas_set_affinity: ibm,set-xive irq=655385 returns -3

This patch fixes the issue by calling irq_dispose_mapping() on the
virq of the viodev on unregister.

Fixes: f2ab6219969f ("powerpc/pseries: Add PFO support to the VIO bus")
Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/64s/radix: Fix process table entry cache invalidation
Nicholas Piggin [Tue, 24 Oct 2017 13:06:54 +0000 (23:06 +1000)]
powerpc/64s/radix: Fix process table entry cache invalidation

According to the architecture, the process table entry cache must be
flushed with tlbie RIC=2.

Currently the process table entry is set to invalid right before the
PID is returned to the allocator, with no invalidation. This works on
existing implementations that are known to not cache the process table
entry for any except the current PIDR.

It is architecturally correct and cleaner to invalidate with RIC=2
after clearing the process table entry and before the PID is returned
to the allocator. This can be done in arch_exit_mmap that runs before
the final flush, and to ensure the final flush (fullmm) is always a
RIC=2 variant.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/64s/radix: Improve preempt handling in TLB code
Nicholas Piggin [Tue, 24 Oct 2017 13:06:53 +0000 (23:06 +1000)]
powerpc/64s/radix: Improve preempt handling in TLB code

Preempt should be consistently disabled for mm_is_thread_local tests,
so bring the rest of these under preempt_disable().

Preempt does not need to be disabled for the mm->context.id tests,
which allows simplification and removal of gotos.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/powernv: Use FIXUP_ENDIAN_HV in OPAL return
Nicholas Piggin [Mon, 23 Oct 2017 07:08:15 +0000 (17:08 +1000)]
powerpc/powernv: Use FIXUP_ENDIAN_HV in OPAL return

Close the recoverability gap for OPAL calls by using FIXUP_ENDIAN_HV
in the return path.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/book3s: Add an HV variant of FIXUP_ENDIAN that is recoverable
Nicholas Piggin [Mon, 23 Oct 2017 07:08:14 +0000 (17:08 +1000)]
powerpc/book3s: Add an HV variant of FIXUP_ENDIAN that is recoverable

Add an HV variant of FIXUP_ENDIAN which uses HSRR[01] and does not
clear MSR[RI], which improves recoverability.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/book3s: Use label for FIXUP_ENDIAN macro branch
Nicholas Piggin [Mon, 23 Oct 2017 07:08:13 +0000 (17:08 +1000)]
powerpc/book3s: Use label for FIXUP_ENDIAN macro branch

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/64: Fix latency tracing for lazy irq replay
Nicholas Piggin [Sat, 21 Oct 2017 07:56:06 +0000 (17:56 +1000)]
powerpc/64: Fix latency tracing for lazy irq replay

When returning from an exception to a soft-enabled context, pending
IRQs are replayed but IRQ tracing is not reset, so a number of them
can get chained together into the same IRQ-disabled trace.

Fix this by having __check_irq_replay re-set IRQ trace. This is
conceptually where we respond to the next interrupt, so it fits the
semantics of the IRQ tracer.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agoKVM: PPC: Book3S HV: Handle host system reset in guest mode
Nicholas Piggin [Sun, 5 Nov 2017 12:33:55 +0000 (23:33 +1100)]
KVM: PPC: Book3S HV: Handle host system reset in guest mode

If the host takes a system reset interrupt while a guest is running,
the CPU must exit the guest before processing the host exception
handler.

After this patch, taking a sysrq+x with a CPU running in a guest
gives a trace like this:

   cpu 0x27: Vector: 100 (System Reset) at [c000000fdf5776f0]
       pc: c008000010158b80: kvmppc_run_core+0x16b8/0x1ad0 [kvm_hv]
       lr: c008000010158b80: kvmppc_run_core+0x16b8/0x1ad0 [kvm_hv]
       sp: c000000fdf577850
      msr: 9000000002803033
     current = 0xc000000fdf4b1e00
     paca    = 0xc00000000fd4d680  softe: 3  irq_happened: 0x01
       pid   = 6608, comm = qemu-system-ppc
   Linux version 4.14.0-rc7-01489-g47e1893a404a-dirty #26 SMP
   [c000000fdf577a00c008000010159dd4 kvmppc_vcpu_run_hv+0x3dc/0x12d0 [kvm_hv]
   [c000000fdf577b30c0080000100a537c kvmppc_vcpu_run+0x44/0x60 [kvm]
   [c000000fdf577b60c0080000100a1ae0 kvm_arch_vcpu_ioctl_run+0x118/0x310 [kvm]
   [c000000fdf577c00c008000010093e98 kvm_vcpu_ioctl+0x530/0x7c0 [kvm]
   [c000000fdf577d50c000000000357bf8 do_vfs_ioctl+0xd8/0x8c0
   [c000000fdf577df0c000000000358448 SyS_ioctl+0x68/0x100
   [c000000fdf577e30c00000000000b220 system_call+0x58/0x6c
   --- Exception: c01 (System Call) at 00007fff76868df0
   SP (7fff7069baf0) is in userspace

Fixes: e36d0a2ed5 ("powerpc/powernv: Implement NMI IPI with OPAL_SIGNAL_SYSTEM_RESET")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/pseries: Cleanup error handling in iommu_pseries_alloc_group()
Markus Elfring [Wed, 18 Oct 2017 18:48:52 +0000 (20:48 +0200)]
powerpc/pseries: Cleanup error handling in iommu_pseries_alloc_group()

Although kfree(NULL) is legal, it's a bit lazy to rely on that to
implement the error handling. So do it the normal Linux way using
labels for each failure path.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
[mpe: Squash a few patches and rewrite change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc-opal: Fix a typo in a comment line of two file headers
Markus Elfring [Tue, 17 Oct 2017 11:31:42 +0000 (13:31 +0200)]
powerpc-opal: Fix a typo in a comment line of two file headers

Fix a word in these descriptions.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/axonram: Drop unnecessary variable initialisation
Markus Elfring [Tue, 5 Sep 2017 16:47:02 +0000 (18:47 +0200)]
powerpc/axonram: Drop unnecessary variable initialisation

The local variable "rc" will eventually be set only to an error code.
Thus omit the explicit initialisation at the beginning.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc: dts: acadia: DT fix s/#interrupts-parent/#interrupt-parent/
Geert Uytterhoeven [Fri, 2 Jun 2017 12:38:47 +0000 (14:38 +0200)]
powerpc: dts: acadia: DT fix s/#interrupts-parent/#interrupt-parent/

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/perf/hv-24x7: Fix incorrect comparison in memord
Michael Ellerman [Mon, 9 Oct 2017 10:52:44 +0000 (21:52 +1100)]
powerpc/perf/hv-24x7: Fix incorrect comparison in memord

In the hv-24x7 code there is a function memord() which tries to
implement a sort function return -1, 0, 1. However one of the
conditions is incorrect, such that it can never be true, because we
will have already returned.

I don't believe there is a bug in practice though, because the
comparisons are an optimisation prior to calling memcmp().

Fix it by swapping the second comparision, so it can be true.

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc: Disable the fast-endian switch syscall by default
Michael Ellerman [Mon, 9 Oct 2017 10:54:05 +0000 (21:54 +1100)]
powerpc: Disable the fast-endian switch syscall by default

Back in 2008 we added support for "fast little-endian switch" in the
syscall path. This added a special case syscall number 0x1ebe, which
is caught very early in the system call exception and switches endian
with as little overhead as possible. See commit 745a14cc264b
("[POWERPC] Add fast little-endian switch system call") for full
details.

Although it is fast, it's also completely non standard. The "syscall
number" is out of the range of normal syscalls, it can't be traced or
audited, and it's a bit of a wart. To the best of our knowledge it was
only used by one program, now long since discontinued.

So in an effort to shake out any current users, put it behind a config
option, and make it default n. If anyone *is* using it they can
quickly reinstate it with a rebuild, and we can flip it to default y.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/64s: Move the two FAST_ENDIAN macros next to each other
Michael Ellerman [Mon, 9 Oct 2017 10:54:04 +0000 (21:54 +1100)]
powerpc/64s: Move the two FAST_ENDIAN macros next to each other

So we can #ifdef them in the next patch.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/xmon: Add kstack base to paca dump
Michael Ellerman [Mon, 9 Oct 2017 10:59:32 +0000 (21:59 +1100)]
powerpc/xmon: Add kstack base to paca dump

When dumping the paca in xmon we currently show kstack. Although it's
not hard it's a bit fiddly to work out what the bounds of the kernel
stack should be based on the kstack value.

To make life easier and "kstack_base" which is the base (lowest
address) of the kernel stack, eg:

 kstack               = 0xc0000000f1a7be30      (0x258)
 kstack_base          = 0xc0000000f1a78000

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/configs: Enable I2C_CHARDEV for pseries and powernv
Andrew Donnellan [Thu, 12 Oct 2017 02:16:59 +0000 (13:16 +1100)]
powerpc/configs: Enable I2C_CHARDEV for pseries and powernv

i2c-dev provides an interface for userspace programs to interact with I2C
devices, and is very helpful for I2C-related debugging.

Enable it in pseries_defconfig and powernv_defconfig. It's already enabled
in many other powerpc defconfigs.

Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mm/radix: Drop unneeded NULL check
Michael Ellerman [Mon, 16 Oct 2017 07:11:00 +0000 (12:41 +0530)]
powerpc/mm/radix: Drop unneeded NULL check

We call these functions with non-NULL mm or vma. Hence we can skip the
NULL check in these functions. We also remove now unused function
__local_flush_hugetlb_page().

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[mpe: Drop the checks with is_vm_hugetlb_page() as noticed by Nick]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/xmon: Check before calling xive functions
Breno Leitao [Tue, 17 Oct 2017 18:20:18 +0000 (16:20 -0200)]
powerpc/xmon: Check before calling xive functions

Currently xmon could call XIVE functions from OPAL even if the XIVE is
disabled or does not exist in the system, as in POWER8 machines. This
causes the following exception:

 1:mon> dx
 cpu 0x1: Vector: 700 (Program Check) at [c000000423c93450]
     pc: c00000000009cfa4: opal_xive_dump+0x50/0x68
     lr: c0000000000997b8: opal_return+0x0/0x50

This patch simply checks if XIVE is enabled before calling XIVE
functions.

Fixes: 243e25112d06 ("powerpc/xive: Native exploitation of the XIVE interrupt controller")
Suggested-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agocxl: Provide debugfs access to PSL_DEBUG/XSL_DEBUG registers
Vaibhav Jain [Wed, 20 Sep 2017 06:23:22 +0000 (11:53 +0530)]
cxl: Provide debugfs access to PSL_DEBUG/XSL_DEBUG registers

Access to PSL/XSL_DEBUG registers on the adapter provides easy access
to the debug facilities provided by PSL/XSL. So this patch adds two
new files (debug, xsl-debug) to the cxl-adapter specific debugfs
folder located at /sys/kernel/debugfs/cxl/card<n>, which will provide
direct r/w access to corrosponding debug registers in the adapter
config-space.

Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/tm: P9 disable transactionally suspended sigcontexts
Michael Neuling [Thu, 12 Oct 2017 10:17:19 +0000 (21:17 +1100)]
powerpc/tm: P9 disable transactionally suspended sigcontexts

Unfortunately userspace can construct a sigcontext which enables
suspend. Thus userspace can force Linux into a path where trechkpt is
executed.

This patch blocks this from happening on POWER9 by sanity checking
sigcontexts passed in.

ptrace doesn't have this problem as only MSR SE and BE can be changed
via ptrace.

This patch also adds a number of WARN_ON()s in case we ever enter
suspend when we shouldn't. This should not happen, but if it does the
symptoms are soft lockup warnings which are not obviously TM related,
so the WARN_ON()s should make it obvious what's happening.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/powernv: Enable TM without suspend if possible
Michael Ellerman [Thu, 12 Oct 2017 10:17:18 +0000 (21:17 +1100)]
powerpc/powernv: Enable TM without suspend if possible

Some Power9 revisions can run in a mode where TM operates without
suspended state. If we find ourself on a CPU that might be in this
mode, we query OPAL to check, and if so we reenable TM in CPU
features, and enable a new user feature to signal to userspace that we
are in this mode.

We do not enable the "normal" user feature, PPC_FEATURE2_HTM, but we
do enable PPC_FEATURE2_HTM_NOSC because that indicates to userspace
that the kernel will abort transactions on syscall entry, which is
true regardless of the suspend mode.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc: Add PPC_FEATURE2_HTM_NO_SUSPEND
Michael Ellerman [Thu, 12 Oct 2017 10:17:17 +0000 (21:17 +1100)]
powerpc: Add PPC_FEATURE2_HTM_NO_SUSPEND

Some CPUs can operate in a mode where TM (Transactional Memory) is
enabled but the suspended state of TM is disabled. In this mode
tsuspend does not enter suspended state, instead the transaction is
aborted. Similarly any other event that would lead to suspended state
instead aborts the transaction.

There is also an ABI change, in that in this mode processes are not
allowed to sigreturn with an MSR that would lead to suspended state,
Linux will instead return an error to the sigreturn syscall.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/tm: Add commandline option to disable hardware transactional memory
Cyril Bur [Thu, 12 Oct 2017 10:17:16 +0000 (21:17 +1100)]
powerpc/tm: Add commandline option to disable hardware transactional memory

Currently the kernel relies on firmware to inform it whether or not the
CPU supports HTM and as long as the kernel was built with
CONFIG_PPC_TRANSACTIONAL_MEM=y then it will allow userspace to make
use of the facility.

There may be situations where it would be advantageous for the kernel
to not allow userspace to use HTM, currently the only way to achieve
this is to recompile the kernel with CONFIG_PPC_TRANSACTIONAL_MEM=n.

This patch adds a simple commandline option so that HTM can be
disabled at boot time.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
[mpe: Simplify to a bool, move to prom.c, put doco in the right place.
 Always disable, regardless of initial state, to avoid user confusion.]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agoMerge branch 'topic/ppc-kvm' into next
Michael Ellerman [Fri, 20 Oct 2017 00:10:30 +0000 (11:10 +1100)]
Merge branch 'topic/ppc-kvm' into next

Bring in some KVM commits we need (the TM one in particular).

7 years agoKVM: PPC: Tie KVM_CAP_PPC_HTM to the user-visible TM feature
Michael Ellerman [Thu, 12 Oct 2017 11:58:54 +0000 (22:58 +1100)]
KVM: PPC: Tie KVM_CAP_PPC_HTM to the user-visible TM feature

Currently we use CPU_FTR_TM to decide if the CPU/kernel can support
TM (Transactional Memory), and if it's true we advertise that to
Qemu (or similar) via KVM_CAP_PPC_HTM.

PPC_FEATURE2_HTM is the user-visible feature bit, which indicates that
the CPU and kernel can support TM. Currently CPU_FTR_TM and
PPC_FEATURE2_HTM always have the same value, either true or false, so
using the former for KVM_CAP_PPC_HTM is correct.

However some Power9 CPUs can operate in a mode where TM is enabled but
TM suspended state is disabled. In this mode CPU_FTR_TM is true, but
PPC_FEATURE2_HTM is false. Instead a different PPC_FEATURE2 bit is
set, to indicate that this different mode of TM is available.

It is not safe to let guests use TM as-is, when the CPU is in this
mode. So to prevent that from happening, use PPC_FEATURE2_HTM to
determine the value of KVM_CAP_PPC_HTM.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agoRevert "KVM: PPC: Book3S HV: POWER9 does not require secondary thread management"
Paul Mackerras [Thu, 19 Oct 2017 04:14:20 +0000 (15:14 +1100)]
Revert "KVM: PPC: Book3S HV: POWER9 does not require secondary thread management"

This reverts commit 94a04bc25a2c6296bd0c5e82c10e8231c2b11f77.

In order to run HPT guests on a radix POWER9 host, we will have to run
the host in single-threaded mode, because POWER9 processors do not
currently support running some threads of a core in HPT mode while
others are in radix mode ("mixed mode").

That means that we will need the same mechanisms that are used on
POWER8 to make the secondary threads available to KVM, which were
disabled on POWER9 by commit 94a04bc25a2c.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/vphn: Fix numa update end-loop bug
Michael Bringmann [Fri, 8 Sep 2017 20:47:56 +0000 (15:47 -0500)]
powerpc/vphn: Fix numa update end-loop bug

powerpc/vphn: On Power systems with shared configurations of CPUs
and memory, there are some issues with the association of additional
CPUs and memory to nodes when hot-adding resources.  This patch
fixes an end-of-updates processing problem observed occasionally
in numa_update_cpu_topology().

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/hotplug: Improve responsiveness of hotplug change
Michael Bringmann [Fri, 8 Sep 2017 20:47:47 +0000 (15:47 -0500)]
powerpc/hotplug: Improve responsiveness of hotplug change

powerpc/hotplug: On Power systems with shared configurations of CPUs
and memory, there are some issues with the association of additional
CPUs and memory to nodes when hot-adding resources.  During hotplug
CPU operations, this patch resets the timer on topology update work
function to a small value to better ensure that the CPU topology is
detected and configured sooner.

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/vphn: Improve recognition of PRRN/VPHN
Michael Bringmann [Fri, 8 Sep 2017 20:47:36 +0000 (15:47 -0500)]
powerpc/vphn: Improve recognition of PRRN/VPHN

powerpc/vphn: On Power systems with shared configurations of CPUs
and memory, there are some issues with the association of additional
CPUs and memory to nodes when hot-adding resources.  This patch
updates the initialization checks to independently recognize PRRN
or VPHN support.

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/vphn: Update CPU topology when VPHN enabled
Michael Bringmann [Fri, 8 Sep 2017 20:47:27 +0000 (15:47 -0500)]
powerpc/vphn: Update CPU topology when VPHN enabled

powerpc/vphn: On Power systems with shared configurations of CPUs
and memory, there are some issues with the association of additional
CPUs and memory to nodes when hot-adding resources.  This patch
corrects the currently broken capability to set the topology for
shared CPUs in LPARs.  At boot time for shared CPU lpars, the
topology for each CPU was being set to node zero.  Now when
numa_update_cpu_topology() is called appropriately, the Virtual
Processor Home Node (VPHN) capabilities information provided by the
pHyp allows the appropriate node in the shared configuration to be
selected for the CPU.

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mce: hookup memory_failure for UE errors
Balbir Singh [Fri, 29 Sep 2017 04:26:55 +0000 (14:26 +1000)]
powerpc/mce: hookup memory_failure for UE errors

If we are in user space and hit a UE error, we now have the
basic infrastructure to walk the page tables and find out
the effective address that was accessed, since the DAR
is not valid.

We use a work_queue content to hookup the bad pfn, any
other context causes problems, since memory_failure itself
can call into schedule() via lru_drain_ bits.

We could probably poison the struct page to avoid a race
between detection and taking corrective action.

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mce: Hookup ierror (instruction) UE errors
Balbir Singh [Fri, 29 Sep 2017 04:26:54 +0000 (14:26 +1000)]
powerpc/mce: Hookup ierror (instruction) UE errors

Hookup instruction errors (UE) for memory offling via memory_failure()
in a manner similar to load/store errors (derror). Since we have access
to the NIP, the conversion is a one step process in this case.

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mce: Hookup derror (load/store) UE errors
Balbir Singh [Fri, 29 Sep 2017 04:26:53 +0000 (14:26 +1000)]
powerpc/mce: Hookup derror (load/store) UE errors

Extract physical_address for UE errors by walking the page
tables for the mm and address at the NIP, to extract the
instruction. Then use the instruction to find the effective
address via analyse_instr().

We might have page table walking races, but we expect them to
be rare, the physical address extraction is best effort. The idea
is to then hook up this infrastructure to memory failure eventually.

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mce: Align the print of physical address better
Balbir Singh [Fri, 29 Sep 2017 04:26:52 +0000 (14:26 +1000)]
powerpc/mce: Align the print of physical address better

Use the same alignment as Effective address.

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mce: Remove unused function get_mce_fault_addr()
Balbir Singh [Fri, 29 Sep 2017 04:26:51 +0000 (14:26 +1000)]
powerpc/mce: Remove unused function get_mce_fault_addr()

There are no users of get_mce_fault_addr() since commit
1363875bdb63 ("powerpc/64s: fix handling of non-synchronous machine
checks") removed the last usage.

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/modules: Use WARN_ON() in stub_for_addr()
Kamalesh Babulal [Tue, 10 Oct 2017 14:47:32 +0000 (20:17 +0530)]
powerpc/modules: Use WARN_ON() in stub_for_addr()

Use WARN_ON(), while running out of stubs in stub_for_addr()
and abort loading of the module instead of BUG_ON().

Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agocxl: Dump PSL_FIR register on PSL9 error irq
Vaibhav Jain [Wed, 11 Oct 2017 06:14:41 +0000 (11:44 +0530)]
cxl: Dump PSL_FIR register on PSL9 error irq

For PSL9 currently we aren't dumping the PSL FIR register when a
PSL error interrupt is triggered. Contents of this register are useful
in debugging AFU issues.

This patch fixes issue by adding a new service_layer_ops callback
cxl_native_err_irq_dump_regs_psl9() to dump the PSL_FIR registers on a
PSL error interrupt thereby bringing the behavior in line with PSL on
POWER-8. Also the existing service_layer_ops callback
for PSL8 has been renamed to cxl_native_err_irq_dump_regs_psl8().

Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agoselftests/powerpc: context_switch: Fix pthread errors
Cyril Bur [Tue, 4 Jul 2017 01:21:15 +0000 (11:21 +1000)]
selftests/powerpc: context_switch: Fix pthread errors

Turns out pthreads returns an errno and doesn't set errno. This doesn't
play well with perror().

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agocxl: Rename register PSL9_FIR2 to PSL9_FIR_MASK
Vaibhav Jain [Mon, 9 Oct 2017 17:56:27 +0000 (23:26 +0530)]
cxl: Rename register PSL9_FIR2 to PSL9_FIR_MASK

PSL9 doesn't have a FIR2 register as was the case with PSL8. However
currently the register definitions in 'cxl.h' have a definition for
PSL9_FIR2 that actually points to PSL9_FIR_MASK register in the P1
area at offset 0x308.

So this patch renames the def PSL9_FIR2 to PSL9_FIR_MASK and updates
the references in the code to point to the new identifier. It also
removes the code to dump contents of FIR2 (FIR_MASK actually) in
cxl_native_irq_dump_regs_psl9().

Fixes: f24be42aab37 ("cxl: Add psl9 specific code")
Reported-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agocxl: Add support for POWER9 DD2
Christophe Lombard [Fri, 8 Sep 2017 13:52:11 +0000 (15:52 +0200)]
cxl: Add support for POWER9 DD2

The PSL initialization sequence has been updated to DD2.
This patch adapts to the changes, retaining compatibility with DD1.
The patch includes some changes to DD1 fix-ups as well.

Tests performed on some of the old/new hardware.

The function is_page_fault(), for POWER9, lists the Translation Checkout
Responses where the page fault will be handled by copro_handle_mm_fault().
This list is too restrictive and not necessary.

This patches removes this restriction and all page faults, whatever the
reason, will be handled. In this case, the interruption is always
acknowledged.

The following features will be added soon:
- phb reset when switching to capi mode.
- cxllib update to support new functions.

Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc: get_wchan(): solve possible race scenario due to parallel wakeup
Kautuk Consul [Tue, 19 Apr 2016 10:18:21 +0000 (15:48 +0530)]
powerpc: get_wchan(): solve possible race scenario due to parallel wakeup

Add a check for p->state == TASK_RUNNING so that any wake-ups on
task_struct p in the interim lead to 0 being returned by get_wchan().

Signed-off-by: Kautuk Consul <kautuk.consul.1980@gmail.com>
[mpe: Confirmed other architectures do similar]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agoselftests/powerpc: Use snprintf to construct DSCR sysfs interface paths
Seth Forshee [Thu, 28 Sep 2017 13:34:26 +0000 (09:34 -0400)]
selftests/powerpc: Use snprintf to construct DSCR sysfs interface paths

Currently sprintf is used, and while paths should never exceed
the size of the buffer it is theoretically possible since
dirent.d_name is 256 bytes. As a result this trips
-Wformat-overflow, and since the test is built with -Wall -Werror
the causes the build to fail. Switch to using snprintf and skip
any paths which are too long for the filename buffer.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc: Always initialize input array when calling epapr_hypercall()
Seth Forshee [Thu, 28 Sep 2017 13:33:39 +0000 (09:33 -0400)]
powerpc: Always initialize input array when calling epapr_hypercall()

Several callers to epapr_hypercall() pass an uninitialized stack
allocated array for the input arguments, presumably because they
have no input arguments. However this can produce errors like
this one

 arch/powerpc/include/asm/epapr_hcalls.h:470:42: error: 'in' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r3 asm("r3") = in[0];
                                        ~~^~~

Fix callers to this function to always zero-initialize the input
arguments array to prevent this.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc: Add PPC_EMULATED_STATS to powernv_defconfig
Michael Neuling [Thu, 21 Sep 2017 05:24:49 +0000 (15:24 +1000)]
powerpc: Add PPC_EMULATED_STATS to powernv_defconfig

This is useful, especially for developers.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/xmon: Add option to show uptime information
Guilherme G. Piccoli [Mon, 18 Sep 2017 14:16:58 +0000 (11:16 -0300)]
powerpc/xmon: Add option to show uptime information

It might be useful to quickly get the uptime of a running system on
xmon, without needing to grab data from memory and doing math on
struct addresses.

For example, it'd be useful to check for how long after a crash a
system is on xmon shell or if some test was started after the first
test crashed (and this 2nd test crashed too into xmon).

This small patch adds the 'U' command, to accomplish this.

Suggested-by: Murilo Fossa Vicentini <muvic@linux.vnet.ibm.com>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
[mpe: Display units (seconds), add sync()/__delay() sequence]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/powernv: Make opal_event_shutdown() callable from IRQ context
Michael Ellerman [Fri, 29 Sep 2017 03:58:02 +0000 (13:58 +1000)]
powerpc/powernv: Make opal_event_shutdown() callable from IRQ context

In opal_event_shutdown() we free all the IRQs hanging off the
opal_event_irqchip. However it's not safe to do so if we're called
from IRQ context, because free_irq() wants to synchronise versus IRQ
context. This can lead to warnings and a stuck system.

For example from sysrq-b:

  Trying to free IRQ 17 from IRQ context!
  ------------[ cut here ]------------
  WARNING: CPU: 0 PID: 0 at kernel/irq/manage.c:1461 __free_irq+0x398/0x8d0
  ...
  NIP __free_irq+0x398/0x8d0
  LR __free_irq+0x394/0x8d0
  Call Trace:
    __free_irq+0x394/0x8d0 (unreliable)
    free_irq+0xa4/0x140
    opal_event_shutdown+0x128/0x180
    opal_shutdown+0x1c/0xb0
    pnv_shutdown+0x20/0x40
    machine_restart+0x38/0x90
    emergency_restart+0x28/0x40
    sysrq_handle_reboot+0x24/0x40
    __handle_sysrq+0x198/0x590
    hvc_poll+0x48c/0x8c0
    hvc_handle_interrupt+0x1c/0x50
    __handle_irq_event_percpu+0xe8/0x6e0
    handle_irq_event_percpu+0x34/0xe0
    handle_irq_event+0xc4/0x210
    handle_level_irq+0x250/0x770
    generic_handle_irq+0x5c/0xa0
    opal_handle_events+0x11c/0x240
    opal_interrupt+0x38/0x50
    __handle_irq_event_percpu+0xe8/0x6e0
    handle_irq_event_percpu+0x34/0xe0
    handle_irq_event+0xc4/0x210
    handle_fasteoi_irq+0x174/0xa10
    generic_handle_irq+0x5c/0xa0
    __do_irq+0xbc/0x4e0
    call_do_irq+0x14/0x24
    do_IRQ+0x18c/0x540
    hardware_interrupt_common+0x158/0x180

We can avoid that by using disable_irq_nosync() rather than
free_irq(). Although it doesn't fully free the IRQ, it should be
sufficient when we're shutting down, particularly in an emergency.

Add an in_interrupt() check and use free_irq() when we're shutting
down normally. It's probably OK to use disable_irq_nosync() in that
case too, but for now it's safer to leave that behaviour as-is.

Fixes: 9f0fd0499d30 ("powerpc/powernv: Add a virtual irqchip for opal events")
Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/jprobes: Validate break handler invocation as being due to a jprobe_return()
Naveen N. Rao [Fri, 22 Sep 2017 09:10:48 +0000 (14:40 +0530)]
powerpc/jprobes: Validate break handler invocation as being due to a jprobe_return()

Fix a circa 2005 FIXME by implementing a check to ensure that we
actually got into the jprobe break handler() due to the trap in
jprobe_return().

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/jprobes: Disable preemption when triggered through ftrace
Naveen N. Rao [Fri, 22 Sep 2017 09:10:47 +0000 (14:40 +0530)]
powerpc/jprobes: Disable preemption when triggered through ftrace

KPROBES_SANITY_TEST throws the below splat when CONFIG_PREEMPT is
enabled:

  Kprobe smoke test: started
  DEBUG_LOCKS_WARN_ON(val > preempt_count())
  ------------[ cut here ]------------
  WARNING: CPU: 19 PID: 1 at kernel/sched/core.c:3094 preempt_count_sub+0xcc/0x140
  Modules linked in:
  CPU: 19 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc7-nnr+ #97
  task: c0000000fea80000 task.stack: c0000000feb00000
  NIP:  c00000000011d3dc LR: c00000000011d3d8 CTR: c000000000a090d0
  REGS: c0000000feb03400 TRAP: 0700   Not tainted  (4.13.0-rc7-nnr+)
  MSR:  8000000000021033 <SF,ME,IR,DR,RI,LE>  CR: 28000282  XER: 00000000
  CFAR: c00000000015aa18 SOFTE: 0
  <snip>
  NIP preempt_count_sub+0xcc/0x140
  LR  preempt_count_sub+0xc8/0x140
  Call Trace:
    preempt_count_sub+0xc8/0x140 (unreliable)
    kprobe_handler+0x228/0x4b0
    program_check_exception+0x58/0x3b0
    program_check_common+0x16c/0x170
    --- interrupt: 0 at kprobe_target+0x8/0x20
                     LR = init_test_probes+0x248/0x7d0
    kp+0x0/0x80 (unreliable)
    livepatch_handler+0x38/0x74
    init_kprobes+0x1d8/0x208
    do_one_initcall+0x68/0x1d0
    kernel_init_freeable+0x298/0x374
    kernel_init+0x24/0x160
    ret_from_kernel_thread+0x5c/0x70
  Instruction dump:
  419effdc 3d22001b 39299240 81290000 2f890000 409effc8 3c82ffcb 3c62ffcb
  3884bc68 3863bc18 4803d5fd 60000000 <0fe000004bffffa8 60000000 60000000
  ---[ end trace 432dd46b4ce3d29f ]---
  Kprobe smoke test: passed successfully

The issue is that we aren't disabling preemption in
kprobe_ftrace_handler(). Disable it.

Fixes: ead514d5fb30a0 ("powerpc/kprobes: Add support for KPROBES_ON_FTRACE")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
[mpe: Trim oops a little for formatting]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/kprobes: Fix warnings from __this_cpu_read() on preempt kernels
Naveen N. Rao [Fri, 22 Sep 2017 09:10:46 +0000 (14:40 +0530)]
powerpc/kprobes: Fix warnings from __this_cpu_read() on preempt kernels

Kamalesh pointed out that we are getting the below call traces with
livepatched functions when we enable CONFIG_PREEMPT:

[  495.470721] BUG: using __this_cpu_read() in preemptible [00000000] code: cat/8394
[  495.471167] caller is is_current_kprobe_addr+0x30/0x90
[  495.471171] CPU: 4 PID: 8394 Comm: cat Tainted: G              K 4.13.0-rc7-nnr+ #95
[  495.471173] Call Trace:
[  495.471178] [c00000008fd9b960] [c0000000009f039c] dump_stack+0xec/0x160 (unreliable)
[  495.471184] [c00000008fd9b9a0] [c00000000059169c] check_preemption_disabled+0x15c/0x170
[  495.471187] [c00000008fd9ba30] [c000000000046460] is_current_kprobe_addr+0x30/0x90
[  495.471191] [c00000008fd9ba60] [c00000000004e9a0] ftrace_call+0x1c/0xb8
[  495.471195] [c00000008fd9bc30] [c000000000376fd8] seq_read+0x238/0x5c0
[  495.471199] [c00000008fd9bcd0] [c0000000003cfd78] proc_reg_read+0x88/0xd0
[  495.471203] [c00000008fd9bd00] [c00000000033e5d4] __vfs_read+0x44/0x1b0
[  495.471206] [c00000008fd9bd90] [c0000000003402ec] vfs_read+0xbc/0x1b0
[  495.471210] [c00000008fd9bde0] [c000000000342138] SyS_read+0x68/0x110
[  495.471214] [c00000008fd9be30] [c00000000000bc6c] system_call+0x58/0x6c

Commit c05b8c4474c030 ("powerpc/kprobes: Skip livepatch_handler() for
jprobes") introduced a helper is_current_kprobe_addr() to help determine
if the current function has been livepatched or if it has a jprobe
installed, both of which modify the NIP. This was subsequently renamed
to __is_active_jprobe().

In the case of a jprobe, kprobe_ftrace_handler() disables pre-emption
before calling into setjmp_pre_handler() which returns without disabling
pre-emption. This is done to ensure that the jprobe handler won't
disappear beneath us if the jprobe is unregistered between the
setjmp_pre_handler() and the subsequent longjmp_break_handler() called
from the jprobe handler. Due to this, we can use __this_cpu_read() in
__is_active_jprobe() with the pre-emption check as we know that
pre-emption will be disabled.

However, if this function has been livepatched, we are still doing this
check and when we do so, pre-emption won't necessarily be disabled. This
results in the call trace shown above.

Fix this by only invoking __is_active_jprobe() when pre-emption is
disabled. And since we now guard this within a pre-emption check, we can
instead use raw_cpu_read() to get the current_kprobe value skipping the
check done by __this_cpu_read().

Fixes: c05b8c4474c030 ("powerpc/kprobes: Skip livepatch_handler() for jprobes")
Reported-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Tested-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/kprobes: Clean up jprobe detection in livepatch handler
Naveen N. Rao [Fri, 22 Sep 2017 09:10:45 +0000 (14:40 +0530)]
powerpc/kprobes: Clean up jprobe detection in livepatch handler

In commit c05b8c4474c03 ("powerpc/kprobes: Skip livepatch_handler() for
jprobes"), we added a helper is_current_kprobe_addr() to help detect if
the modified regs->nip was due to a jprobe or livepatch. Masami felt
that the function name was not quite clear. To that end, this patch
renames is_current_kprobe_addr() to __is_active_jprobe() and adds a
comment to (hopefully) better clarify the purpose of this helper. The
helper has also now been moved to kprobes-ftrace.c so that it is only
available for KPROBES_ON_FTRACE.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/kprobes: Do not suppress instruction emulation if a single run failed
Naveen N. Rao [Fri, 22 Sep 2017 09:10:44 +0000 (14:40 +0530)]
powerpc/kprobes: Do not suppress instruction emulation if a single run failed

Currently, we disable instruction emulation if emulate_step() fails for
any reason. However, such failures could be transient and specific to a
particular run. Instead, only disable instruction emulation if we have
never been able to emulate this. If we had emulated this instruction
successfully at least once, then we single step only this probe hit and
continue to try emulating the instruction in subsequent probe hits.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/kprobes: Some cosmetic updates to try_to_emulate()
Naveen N. Rao [Fri, 22 Sep 2017 09:10:43 +0000 (14:40 +0530)]
powerpc/kprobes: Some cosmetic updates to try_to_emulate()

1. This is only used in kprobes.c, so make it static.
2. Remove the un-necessary (ret == 0) comparison in the else clause.

Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/configs: Add Skiroot defconfig
Joel Stanley [Wed, 4 Oct 2017 04:23:24 +0000 (14:53 +1030)]
powerpc/configs: Add Skiroot defconfig

This configuration is used by the OpenPower firmware for it's
Linux-as-bootloader implementation. Also known as the Petitboot
kernel, this configuration broke in 4.12 (CPU_HOTPLUG=n), so add it to
the upstream tree in order to get better coverage.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/lib/sstep: Fix fixed-point shift instructions that set CA32
Sandipan Das [Fri, 29 Sep 2017 05:44:10 +0000 (11:14 +0530)]
powerpc/lib/sstep: Fix fixed-point shift instructions that set CA32

This fixes the emulated behaviour of existing fixed-point shift right
algebraic instructions that are supposed to set both the CA and CA32
bits of XER when running on a system that is compliant with POWER ISA
v3.0 independent of whether the system is executing in 32-bit mode or
64-bit mode. The following instructions are affected:
  * Shift Right Algebraic Word Immediate (srawi[.])
  * Shift Right Algebraic Word (sraw[.])
  * Shift Right Algebraic Doubleword Immediate (sradi[.])
  * Shift Right Algebraic Doubleword (srad[.])

Fixes: 0016a4cf5582 ("powerpc: Emulate most Book I instructions in emulate_step()")
Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/lib/sstep: Fix fixed-point arithmetic instructions that set CA32
Sandipan Das [Fri, 29 Sep 2017 05:44:09 +0000 (11:14 +0530)]
powerpc/lib/sstep: Fix fixed-point arithmetic instructions that set CA32

There are existing fixed-point arithmetic instructions that always set the
CA bit of XER to reflect the carry out of bit 0 in 64-bit mode and out of
bit 32 in 32-bit mode. In ISA v3.0, these instructions also always set the
CA32 bit of XER to reflect the carry out of bit 32.

This fixes the emulated behaviour of such instructions when running on a
system that is compliant with POWER ISA v3.0. The following instructions
are affected:
  * Add Immediate Carrying (addic)
  * Add Immediate Carrying and Record (addic.)
  * Subtract From Immediate Carrying (subfic)
  * Add Carrying (addc[.])
  * Subtract From Carrying (subfc[.])
  * Add Extended (adde[.])
  * Subtract From Extended (subfe[.])
  * Add to Minus One Extended (addme[.])
  * Subtract From Minus One Extended (subfme[.])
  * Add to Zero Extended (addze[.])
  * Subtract From Zero Extended (subfze[.])

Fixes: 0016a4cf5582 ("powerpc: Emulate most Book I instructions in emulate_step()")
Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/lib/sstep: Add XER bits introduced in POWER ISA v3.0
Sandipan Das [Fri, 29 Sep 2017 05:44:08 +0000 (11:14 +0530)]
powerpc/lib/sstep: Add XER bits introduced in POWER ISA v3.0

This adds definitions for the OV32 and CA32 bits of XER that
were introduced in POWER ISA v3.0. There are some existing
instructions that currently set the OV and CA bits based on
certain conditions.

The emulation behaviour of all these instructions needs to
be updated to set these new bits accordingly.

Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/powermac: Use setup_timer() helper
Allen Pais [Fri, 22 Sep 2017 11:35:00 +0000 (17:05 +0530)]
powerpc/powermac: Use setup_timer() helper

Use setup_timer function instead of initializing timer with the
function and data fields.

Signed-off-by: Allen Pais <allen.lkml@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/6xx: Use setup_timer() helper
Allen Pais [Fri, 22 Sep 2017 11:34:59 +0000 (17:04 +0530)]
powerpc/6xx: Use setup_timer() helper

Use setup_timer function instead of initializing timer with the
function and data fields.

Signed-off-by: Allen Pais <allen.lkml@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/oprofile: Use setup_timer() helper
Allen Pais [Fri, 22 Sep 2017 11:34:58 +0000 (17:04 +0530)]
powerpc/oprofile: Use setup_timer() helper

Use setup_timer function instead of initializing timer with the
function and data fields.

Signed-off-by: Allen Pais <allen.lkml@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/powernv: Use early_radix_enabled in POWER9 tlb flush
Nicholas Piggin [Wed, 27 Sep 2017 05:45:58 +0000 (15:45 +1000)]
powerpc/powernv: Use early_radix_enabled in POWER9 tlb flush

This code is used at boot and machine checks, so it should be using
early_radix_enabled() (which is usable any time).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/powernv: Implement NMI IPI with OPAL_SIGNAL_SYSTEM_RESET
Nicholas Piggin [Fri, 29 Sep 2017 03:29:42 +0000 (13:29 +1000)]
powerpc/powernv: Implement NMI IPI with OPAL_SIGNAL_SYSTEM_RESET

This allows MSR[EE]=0 lockups to be detected on an OPAL (bare metal)
system similarly to the hcall NMI IPI on pseries guests, when the
platform/firmware supports it.

This is an example of CPU10 spinning with interrupts hard disabled:

  Watchdog CPU:32 detected Hard LOCKUP other CPUS:10
  Watchdog CPU:10 Hard LOCKUP
  CPU: 10 PID: 4410 Comm: bash Not tainted 4.13.0-rc7-00074-ge89ce1f89f62-dirty #34
  task: c0000003a82b4400 task.stack: c0000003af55c000
  NIP: c0000000000a7b38 LR: c000000000659044 CTR: c0000000000a7b00
  REGS: c00000000fd23d80 TRAP: 0100   Not tainted  (4.13.0-rc7-00074-ge89ce1f89f62-dirty)
  MSR: 90000000000c1033 <SF,HV,ME,IR,DR,RI,LE>
  CR: 28422222  XER: 20000000
  CFAR: c0000000000a7b38 SOFTE: 0
  GPR00: c000000000659044 c0000003af55fbb0 c000000001072a00 0000000000000078
  GPR04: c0000003c81b5c80 c0000003c81cc7e8 9000000000009033 0000000000000000
  GPR08: 0000000000000000 c0000000000a7b00 0000000000000001 9000000000001003
  GPR12: c0000000000a7b00 c00000000fd83200 0000000010180df8 0000000010189e60
  GPR16: 0000000010189ed8 0000000010151270 000000001018bd88 000000001018de78
  GPR20: 00000000370a0668 0000000000000001 00000000101645e0 0000000010163c10
  GPR24: 00007fffd14d6294 00007fffd14d6290 c000000000fba6f0 0000000000000004
  GPR28: c000000000f351d8 0000000000000078 c000000000f4095c 0000000000000000
  NIP [c0000000000a7b38] sysrq_handle_xmon+0x38/0x40
  LR [c000000000659044] __handle_sysrq+0xe4/0x270
  Call Trace:
  [c0000003af55fbd0] [c000000000659044] __handle_sysrq+0xe4/0x270
  [c0000003af55fc70] [c000000000659810] write_sysrq_trigger+0x70/0xa0
  [c0000003af55fca0] [c0000000003da650] proc_reg_write+0xb0/0x110
  [c0000003af55fcf0] [c0000000003423bc] __vfs_write+0x6c/0x1b0
  [c0000003af55fd90] [c000000000344398] vfs_write+0xd8/0x240
  [c0000003af55fde0] [c00000000034632c] SyS_write+0x6c/0x110
  [c0000003af55fe30] [c00000000000b220] system_call+0x58/0x6c

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Use kernel types for opal_signal_system_reset()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/64s: Implement system reset idle wakeup reason
Nicholas Piggin [Fri, 29 Sep 2017 03:29:41 +0000 (13:29 +1000)]
powerpc/64s: Implement system reset idle wakeup reason

It is possible to wake from idle due to a system reset exception, in
which case the CPU takes a system reset interrupt to wake from idle,
with system reset as the wakeup reason.

The regular (not idle wakeup) system reset interrupt handler must be
invoked in this case, otherwise the system reset interrupt is lost.

Handle the system reset interrupt immediately after CPU state has been
restored.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/xmon: Avoid tripping SMP hardlockup watchdog
Nicholas Piggin [Fri, 29 Sep 2017 03:29:40 +0000 (13:29 +1000)]
powerpc/xmon: Avoid tripping SMP hardlockup watchdog

The SMP hardlockup watchdog cross-checks other CPUs for lockups, which
causes xmon headaches because it's assuming interrupts hard disabled
means no watchdog troubles. Try to improve that by calling
touch_nmi_watchdog() in obvious places where secondaries are spinning.

Also annotate these spin loops with spin_begin/end calls.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/watchdog: Do not trigger SMP crash from touch_nmi_watchdog
Nicholas Piggin [Fri, 29 Sep 2017 03:29:39 +0000 (13:29 +1000)]
powerpc/watchdog: Do not trigger SMP crash from touch_nmi_watchdog

In xmon, touch_nmi_watchdog() is not expected to be checking that
other CPUs have not touched the watchdog, so the code will just call
touch_nmi_watchdog() once before re-enabling hard interrupts.

Just update our CPU's state, and ignore apparently stuck SMP threads.

Arguably touch_nmi_watchdog should check for SMP lockups, and callers
should be fixed, but that's not trivial for the input code of xmon.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/watchdog: Do not backtrace locked CPUs twice if allcpus backtrace is enabled
Nicholas Piggin [Fri, 29 Sep 2017 03:29:38 +0000 (13:29 +1000)]
powerpc/watchdog: Do not backtrace locked CPUs twice if allcpus backtrace is enabled

If sysctl_hardlockup_all_cpu_backtrace is enabled, there is no need to
IPI stuck CPUs for backtrace before trigger_allbutself_cpu_backtrace(),
which does the same thing again.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/watchdog: Do not panic from locked CPU's IPI handler
Nicholas Piggin [Fri, 29 Sep 2017 03:29:37 +0000 (13:29 +1000)]
powerpc/watchdog: Do not panic from locked CPU's IPI handler

The SMP watchdog will detect locked CPUs and IPI them to print a
backtrace and registers. If panic on hard lockup is enabled, do not
panic from this handler, because that can cause recursion into the IPI
layer during the panic.

The caller already panics in this case.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agocxl: Set the valid bit in PE for dedicated mode
Vaibhav Jain [Mon, 4 Sep 2017 08:48:25 +0000 (14:18 +0530)]
cxl: Set the valid bit in PE for dedicated mode

Make sure to set the valid-bit in software-state field of the
populated PE. This was earlier missing for dedicated mode AFUs, hence
was causing a PSL freeze when the AFU was activated.

Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agocxl: Enable global TLBIs for cxl contexts
Frederic Barrat [Sun, 3 Sep 2017 18:15:13 +0000 (20:15 +0200)]
cxl: Enable global TLBIs for cxl contexts

The PSL and nMMU need to see all TLB invalidations for the memory
contexts used on the adapter. For the hash memory model, it is done by
making all TLBIs global as soon as the cxl driver is in use. For
radix, we need something similar, but we can refine and only convert
to global the invalidations for contexts actually used by the device.

The new mm_context_add_copro() API increments the 'active_cpus' count
for the contexts attached to the cxl adapter. As soon as there's more
than 1 active cpu, the TLBIs for the context become global. Active cpu
count must be decremented when detaching to restore locality if
possible and to avoid overflowing the counter.

The hash memory model support is somewhat limited, as we can't
decrement the active cpus count when mm_context_remove_copro() is
called, because we can't flush the TLB for a mm on hash. So TLBIs
remain global on hash.

Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Fixes: f24be42aab37 ("cxl: Add psl9 specific code")
Tested-by: Alistair Popple <alistair@popple.id.au>
[mpe: Fold in updated comment on the barrier from Fred]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/mm: Export flush_all_mm()
Frederic Barrat [Sun, 3 Sep 2017 18:15:12 +0000 (20:15 +0200)]
powerpc/mm: Export flush_all_mm()

With the optimizations introduced by commit a46cc7a90fd8
("powerpc/mm/radix: Improve TLB/PWC flushes"), flush_tlb_mm() no
longer flushes the page walk cache (PWC) with radix. This patch
introduces flush_all_mm(), which flushes everything, TLB and PWC, for
a given mm.

Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-By: Alistair Popple <alistair@popple.id.au>
[mpe: Add a WARN_ON_ONCE() in the empty hash routines]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/64s: Add workaround for P9 vector CI load issue
Michael Neuling [Fri, 15 Sep 2017 05:25:48 +0000 (15:25 +1000)]
powerpc/64s: Add workaround for P9 vector CI load issue

POWER9 DD2.1 and earlier has an issue where some cache inhibited
vector load will return bad data. The workaround is two part, one
firmware/microcode part triggers HMI interrupts when hitting such
loads, the other part is this patch which then emulates the
instructions in Linux.

The affected instructions are limited to lxvd2x, lxvw4x, lxvb16x and
lxvh8x.

When an instruction triggers the HMI, all threads in the core will be
sent to the HMI handler, not just the one running the vector load.

In general, these spurious HMIs are detected by the emulation code and
we just return back to the running process. Unfortunately, if a
spurious interrupt occurs on a vector load that's to normal memory we
have no way to detect that it's spurious (unless we walk the page
tables, which is very expensive). In this case we emulate the load but
we need do so using a vector load itself to ensure 128bit atomicity is
preserved.

Some additional debugfs emulated instruction counters are added also.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[mpe: Switch CONFIG_PPC_BOOK3S_64 to CONFIG_VSX to unbreak the build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/powernv: Rework EEH initialization on powernv
Benjamin Herrenschmidt [Thu, 7 Sep 2017 06:35:44 +0000 (16:35 +1000)]
powerpc/powernv: Rework EEH initialization on powernv

Remove the post_init callback which is only used
by powernv, we can just call it explicitly from
the powernv code.

This partially kills the ability to "disable" eeh at
runtime via debugfs as this was calling that same
callback again, but this is both unused and broken
in several ways. If we want to revive it, we need
to create a dedicated enable/disable callback on the
backend that does the right thing.

Let the bulk of eeh initialize normally at
core_initcall() like it does on pseries by removing
the hack in eeh_init() that delays it.

Instead we make sure our eeh->probe cleanly bails
out of the PEs haven't been created yet and we force
a re-probe where we used to call eeh_init() again.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agoLinux 4.14-rc2
Linus Torvalds [Sun, 24 Sep 2017 23:38:56 +0000 (16:38 -0700)]
Linux 4.14-rc2

7 years agoMerge tag 'devicetree-fixes-for-4.14' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 24 Sep 2017 23:04:12 +0000 (16:04 -0700)]
Merge tag 'devicetree-fixes-for-4.14' of git://git./linux/kernel/git/robh/linux

Pull DeviceTree fixes from Rob Herring:

 - fix build for !OF providing empty of_find_device_by_node

 - fix Abracon vendor prefix

 - sync dtx_diff include paths (again)

 - a stm32h7 clock binding doc fix

* tag 'devicetree-fixes-for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  dt-bindings: clk: stm32h7: fix clock-cell size
  scripts/dtc: dtx_diff - 2nd update of include dts paths to match build
  dt-bindings: fix vendor prefix for Abracon
  of: provide inline helper for of_find_device_by_node

7 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 24 Sep 2017 19:33:58 +0000 (12:33 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Another round of CR3/PCID related fixes (I think this addresses all
  but one of the known problems with PCID support), an objtool fix plus
  a Clang fix that (finally) solves all Clang quirks to build a bootable
  x86 kernel as-is"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/asm: Fix inline asm call constraints for Clang
  objtool: Handle another GCC stack pointer adjustment bug
  x86/mm/32: Load a sane CR3 before cpu_init() on secondary CPUs
  x86/mm/32: Move setup_clear_cpu_cap(X86_FEATURE_PCID) earlier
  x86/mm/64: Stop using CR3.PCID == 0 in ASID-aware code
  x86/mm: Factor out CR3-building code

7 years agoMerge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 24 Sep 2017 19:28:55 +0000 (12:28 -0700)]
Merge branch 'timers-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull timer fix from Ingo Molnar:
 "A clocksource driver section mismatch fix"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource/integrator: Fix section mismatch warning

7 years agoMerge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 24 Sep 2017 18:57:07 +0000 (11:57 -0700)]
Merge branch 'irq-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull irq fixes from Ingo Molnar:
 "Three irqchip driver fixes, and an affinity mask helper function bug
  fix affecting x86"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Revert "genirq: Restrict effective affinity to interrupts actually using it"
  irqchip.mips-gic: Fix shared interrupt mask writes
  irqchip/gic-v4: Fix building with ancient gcc
  irqchip/gic-v3: Iterate over possible CPUs by for_each_possible_cpu()

7 years agoMerge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 24 Sep 2017 18:53:13 +0000 (11:53 -0700)]
Merge branch 'core-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull address-limit checking fixes from Ingo Molnar:
 "This fixes a number of bugs in the address-limit (USER_DS) checks that
  got introduced in the merge window, (mostly) affecting the ARM and
  ARM64 platforms"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  arm64/syscalls: Move address limit check in loop
  arm/syscalls: Optimize address limit check
  Revert "arm/syscalls: Check address limit on user-mode return"
  syscalls: Use CHECK_DATA_CORRUPTION for addr_limit_user_check

7 years agoMerge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
Linus Torvalds [Sun, 24 Sep 2017 18:40:41 +0000 (11:40 -0700)]
Merge branch 'next-general' of git://git./linux/kernel/git/jmorris/linux-security

Pull misc security layer update from James Morris:
 "This is the remaining 'general' change in the security tree for v4.14,
  following the direct merging of SELinux (+ TOMOYO), AppArmor, and
  seccomp.

  That's everything now for the security tree except IMA, which will
  follow shortly (I've been traveling for the past week with patchy
  internet)"

* 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  security: fix description of values returned by cap_inode_need_killpriv

7 years agoMerge branch 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
Linus Torvalds [Sun, 24 Sep 2017 18:34:28 +0000 (11:34 -0700)]
Merge branch 'next-tpm' of git://git./linux/kernel/git/jmorris/linux-security

Pull TPM updates from James Morris:
 "Here are the TPM updates from Jarkko for v4.14, which I've placed in
  their own branch (next-tpm). I ended up cherry-picking them as other
  changes had been made in Jarkko's branch after he sent me his original
  pull request.

  I plan on maintaining a separate branch for TPM (and other security
  subsystems) from now on.

  From Jarkko: 'Not much this time except a few fixes'"

* 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  tpm: ibmvtpm: simplify crq initialization and document crq format
  tpm: replace msleep() with  usleep_range() in TPM 1.2/2.0 generic drivers
  Documentation: tpm: add powered-while-suspended binding documentation
  tpm: tpm_crb: constify acpi_device_id.
  tpm: vtpm: constify vio_device_id

7 years agotpm: ibmvtpm: simplify crq initialization and document crq format
Michal Suchanek [Fri, 24 Feb 2017 19:35:16 +0000 (20:35 +0100)]
tpm: ibmvtpm: simplify crq initialization and document crq format

The crq is passed in registers and is the same on BE and LE hosts.
However, current implementation allocates a structure on-stack to
represent the crq, initializes the members swapping them to BE, and
loads the structure swapping it from BE. This is pointless and causes
GCC warnings about ununitialized members. Get rid of the structure and
the warnings.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
7 years agotpm: replace msleep() with usleep_range() in TPM 1.2/2.0 generic drivers
Hamza Attak [Mon, 14 Aug 2017 18:09:16 +0000 (19:09 +0100)]
tpm: replace msleep() with  usleep_range() in TPM 1.2/2.0 generic drivers

The patch simply replaces all msleep function calls with usleep_range calls
in the generic drivers.

Tested with an Infineon TPM 1.2, using the generic tpm-tis module, for a
thousand PCR extends, we see results going from 1m57s unpatched to 40s
with the new patch. We obtain similar results when using the original and
patched tpm_infineon driver, which is also part of the patch.
Similarly with a STM TPM 2.0, using the CRB driver, it takes about 20ms per
extend unpatched and around 7ms with the new patch.

Note that the PCR consistency is untouched with this patch, each TPM has
been tested with 10 million extends and the aggregated PCR value is
continuously verified to be correct.

As an extension of this work, this could potentially and easily be applied
to other vendor's drivers. Still, these changes are not included in the
proposed patch as they are untested.

Signed-off-by: Hamza Attak <hamza@hpe.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
7 years agoDocumentation: tpm: add powered-while-suspended binding documentation
Enric Balletbo i Serra [Tue, 27 Jun 2017 10:27:23 +0000 (12:27 +0200)]
Documentation: tpm: add powered-while-suspended binding documentation

Add a new powered-while-suspended property to control the behavior of the
TPM suspend/resume.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
7 years agotpm: tpm_crb: constify acpi_device_id.
Arvind Yadav [Thu, 6 Jul 2017 17:48:39 +0000 (23:18 +0530)]
tpm: tpm_crb: constify acpi_device_id.

acpi_device_id are not supposed to change at runtime. All functions
working with acpi_device_id provided by <acpi/acpi_bus.h> work with
const acpi_device_id. So mark the non-const structs as const.

File size before:
   text    data     bss     dec     hex filename
   4198     608       0    4806    12c6 drivers/char/tpm/tpm_crb.o

File size After adding 'const':
   text    data     bss     dec     hex filename
   4262     520       0    4782    12ae drivers/char/tpm/tpm_crb.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
7 years agotpm: vtpm: constify vio_device_id
Arvind Yadav [Thu, 17 Aug 2017 17:34:21 +0000 (23:04 +0530)]
tpm: vtpm: constify vio_device_id

vio_device_id are not supposed to change at runtime. All functions
working with vio_device_id provided by <asm/vio.h> work with
const vio_device_id. So mark the non-const structs as const.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
7 years agosecurity: fix description of values returned by cap_inode_need_killpriv
Stefan Berger [Thu, 27 Jul 2017 02:27:05 +0000 (22:27 -0400)]
security: fix description of values returned by cap_inode_need_killpriv

cap_inode_need_killpriv returns 1 if security.capability exists and
has a value and inode_killpriv() is required, 0 otherwise. Fix the
description of the return value to reflect this.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
7 years agoMerge branch 'parisc-4.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
Linus Torvalds [Sat, 23 Sep 2017 16:14:06 +0000 (06:14 -1000)]
Merge branch 'parisc-4.14-2' of git://git./linux/kernel/git/deller/parisc-linux

Pull parisc fixes from Helge Deller:

 - Unbreak parisc bootloader by avoiding a gcc-7 optimization to convert
   multiple byte-accesses into one word-access.

 - Add missing HWPOISON page fault handler code. I completely missed
   that when I added HWPOISON support during this merge window and it
   only showed up now with the madvise07 LTP test case.

 - Fix backtrace unwinding to stop when stack start has been reached.

 - Issue warning if initrd has been loaded into memory regions with
   broken RAM modules.

 - Fix HPMC handler (parisc hardware fault handler) to comply with
   architecture specification.

 - Avoid compiler warnings about too large frame sizes.

 - Minor init-section fixes.

* 'parisc-4.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Unbreak bootloader due to gcc-7 optimizations
  parisc: Reintroduce option to gzip-compress the kernel
  parisc: Add HWPOISON page fault handler code
  parisc: Move init_per_cpu() into init section
  parisc: Check if initrd was loaded into broken RAM
  parisc: Add PDCE_CHECK instruction to HPMC handler
  parisc: Add wrapper for pdc_instr() firmware function
  parisc: Move start_parisc() into init section
  parisc: Stop unwinding at start of stack
  parisc: Fix too large frame size warnings

7 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
Linus Torvalds [Sat, 23 Sep 2017 15:47:04 +0000 (05:47 -1000)]
Merge tag 'for-linus' of git://git./linux/kernel/git/dledford/rdma

Pull rdma fixes from Doug Ledford:

 - Smattering of miscellanous fixes

 - A five patch series for i40iw that had a patch (5/5) that was larger
   than I would like, but I took it because it's needed for large scale
   users

 - An 8 patch series for bnxt_re that landed right as I was leaving on
   PTO and so had to wait until now...they are all appropriate fixes for
   -rc IMO

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma: (22 commits)
  bnxt_re: Don't issue cmd to delete GID for QP1 GID entry before the QP is destroyed
  bnxt_re: Fix memory leak in FRMR path
  bnxt_re: Remove RTNL lock dependency in bnxt_re_query_port
  bnxt_re: Fix race between the netdev register and unregister events
  bnxt_re: Free up devices in module_exit path
  bnxt_re: Fix compare and swap atomic operands
  bnxt_re: Stop issuing further cmds to FW once a cmd times out
  bnxt_re: Fix update of qplib_qp.mtu when modified
  i40iw: Add support for port reuse on active side connections
  i40iw: Add missing VLAN priority
  i40iw: Call i40iw_cm_disconn on modify QP to disconnect
  i40iw: Prevent multiple netdev event notifier registrations
  i40iw: Fail open if there are no available MSI-X vectors
  RDMA/vmw_pvrdma: Fix reporting correct opcodes for completion
  IB/bnxt_re: Fix frame stack compilation warning
  IB/mlx5: fix debugfs cleanup
  IB/ocrdma: fix incorrect fall-through on switch statement
  IB/ipoib: Suppress the retry related completion errors
  iw_cxgb4: remove the stid on listen create failure
  iw_cxgb4: drop listen destroy replies if no ep found
  ...

7 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Sat, 23 Sep 2017 15:41:27 +0000 (05:41 -1000)]
Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) Fix NAPI poll list corruption in enic driver, from Christian
    Lamparter.

 2) Fix route use after free, from Eric Dumazet.

 3) Fix regression in reuseaddr handling, from Josef Bacik.

 4) Assert the size of control messages in compat handling since we copy
    it in from userspace twice. From Meng Xu.

 5) SMC layer bug fixes (missing RCU locking, bad refcounting, etc.)
    from Ursula Braun.

 6) Fix races in AF_PACKET fanout handling, from Willem de Bruijn.

 7) Don't use ARRAY_SIZE on spinlock array which might have zero
    entries, from Geert Uytterhoeven.

 8) Fix miscomputation of checksum in ipv6 udp code, from Subash Abhinov
    Kasiviswanathan.

 9) Push the ipv6 header properly in ipv6 GRE tunnel driver, from Xin
    Long.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (75 commits)
  inet: fix improper empty comparison
  net: use inet6_rcv_saddr to compare sockets
  net: set tb->fast_sk_family
  net: orphan frags on stand-alone ptype in dev_queue_xmit_nit
  MAINTAINERS: update git tree locations for ieee802154 subsystem
  net: prevent dst uses after free
  net: phy: Fix truncation of large IRQ numbers in phy_attached_print()
  net/smc: no close wait in case of process shut down
  net/smc: introduce a delay
  net/smc: terminate link group if out-of-sync is received
  net/smc: longer delay for client link group removal
  net/smc: adapt send request completion notification
  net/smc: adjust net_device refcount
  net/smc: take RCU read lock for routing cache lookup
  net/smc: add receive timeout check
  net/smc: add missing dev_put
  net: stmmac: Cocci spatch "of_table"
  lan78xx: Use default values loaded from EEPROM/OTP after reset
  lan78xx: Allow EEPROM write for less than MAX_EEPROM_SIZE
  lan78xx: Fix for eeprom read/write when device auto suspend
  ...