GitHub/LineageOS/G12/android_kernel_amlogic_linux-4.9.git
9 years agopowerpc/mm: Warn on flushing tlb page in kernel context
Arseny Solokha [Wed, 4 Feb 2015 02:18:02 +0000 (13:18 +1100)]
powerpc/mm: Warn on flushing tlb page in kernel context

Function __flush_tlb_page() must only be called for user contexts, so
put in extra hardening to warn on calling it for kernel context.

Signed-off-by: Arseny Solokha <asolokha@kb.kras.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/powernv: Add OPAL soft-poweroff routine
Joel Stanley [Fri, 30 Jan 2015 06:43:08 +0000 (17:13 +1030)]
powerpc/powernv: Add OPAL soft-poweroff routine

Register a notifier for a OPAL message indicating that the machine
should prepare itself for a graceful power off.

OPAL will tell us if the power off is a reboot or shutdown, but for now
we perform the same orderly_poweroff action.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agoMerge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/scottwood/linux...
Michael Ellerman [Wed, 4 Feb 2015 01:03:21 +0000 (12:03 +1100)]
Merge branch 'next' of git://git./linux/kernel/git/scottwood/linux into next

Freescale updates from Scott:

"Highlights include 8xx optimizations, some more work on datapath device
tree content, e300 machine check support, t1040 corenet error reporting,
and various cleanups and fixes."

9 years agopowerpc/perf/hv-24x7: Document sysfs event description entries
Cody P Schafer [Fri, 30 Jan 2015 21:46:03 +0000 (13:46 -0800)]
powerpc/perf/hv-24x7: Document sysfs event description entries

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/perf/hv-gpci: add the remaining gpci requests
Cody P Schafer [Fri, 30 Jan 2015 21:46:02 +0000 (13:46 -0800)]
powerpc/perf/hv-gpci: add the remaining gpci requests

Add the remaining gpci requests that contain counters suitable for use
by perf. Omit those that don't contain any counters (but note their
ommision).

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/perf/{hv-gpci, hv-common}: generate requests with counters annotated
Cody P Schafer [Fri, 30 Jan 2015 21:46:01 +0000 (13:46 -0800)]
powerpc/perf/{hv-gpci, hv-common}: generate requests with counters annotated

This adds (in req-gen/) a framework for defining gpci counter requests.
It uses macro magic similar to ftrace.

Also convert the existing hv-gpci request structures and enum values to
use the new framework (and adjust old users of the structs and enum
values to cope with changes in naming).

In exchange for this macro disaster, we get autogenerated event listing
for GPCI in sysfs, build time field offset checking, and zero
duplication of information about GPCI requests.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/perf/hv-24x7: parse catalog and populate sysfs with events
Cody P Schafer [Fri, 30 Jan 2015 21:46:00 +0000 (13:46 -0800)]
powerpc/perf/hv-24x7: parse catalog and populate sysfs with events

Retrieves and parses the 24x7 catalog on POWER systems that supply it
(right now, only POWER 8). Events are exposed via sysfs in the standard
fashion, and are all parameterized.

$ cd /sys/bus/event_source/devices/hv_24x7/events

$ cat HPM_CS_FROM_L4_LDATA__PHYS_CORE
domain=0x2,offset=0xd58,core=?,lpar=0x0

$ cat HPM_TLBIE__VCPU_HOME_CHIP
domain=0x4,offset=0x358,vcpu=?,lpar=?

where user is required to specify values for the fields with '?' (like
core, vcpu, lpar above), when specifying the event with the perf tool.

Catalog is (at the moment) only parsed on boot. It needs re-parsing
when a some hypervisor events occur. At that point we'll also need to
prevent old events from continuing to function (counter that is passed
in via spare space in the config values?).

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agoperf: define EVENT_DEFINE_RANGE_FORMAT_LITE helper
sukadev@linux.vnet.ibm.com [Fri, 30 Jan 2015 21:45:59 +0000 (13:45 -0800)]
perf: define EVENT_DEFINE_RANGE_FORMAT_LITE helper

Define a lite version of the EVENT_DEFINE_RANGE_FORMAT() that avoids
defining helper functions for the bit-field ranges.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agoperf: add PMU_EVENT_ATTR_STRING() helper
Cody P Schafer [Fri, 30 Jan 2015 21:45:58 +0000 (13:45 -0800)]
perf: add PMU_EVENT_ATTR_STRING() helper

Helper for constructing static struct perf_pmu_events_attr s.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agoperf: provide sysfs_show for struct perf_pmu_events_attr
Cody P Schafer [Fri, 30 Jan 2015 21:45:57 +0000 (13:45 -0800)]
perf: provide sysfs_show for struct perf_pmu_events_attr

(struct perf_pmu_events_attr) is defined in include/linux/perf_event.h,
but the only "show" for it is in x86 and contains x86 specific stuff.

Make a generic one for those of us who are just using the event_str.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/kernel: Avoid initializing device-tree pointer twice
Gavin Shan [Thu, 8 Jan 2015 05:41:47 +0000 (16:41 +1100)]
powerpc/kernel: Avoid initializing device-tree pointer twice

As commit 50ba08f3 ("of/fdt: Don't clear initial_boot_params
if fdt_check_header() fails") does, the device-tree pointer
"initial_boot_params" is initialized by early_init_dt_verify(),
which is called by early_init_devtree(). So we needn't explicitly
initialize that again in early_init_devtree().

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Remove old compile time disabled syscall tracing code
Michael Ellerman [Wed, 14 Jan 2015 03:47:56 +0000 (14:47 +1100)]
powerpc: Remove old compile time disabled syscall tracing code

We have code to do syscall tracing which is disabled at compile time by
default. It's not been touched since the dawn of time (ie. v2.6.12).

There are now better ways to do syscall tracing, ie. using the
raw_syscall, or syscall tracepoints.

For the specific case of tracing syscalls at boot on a system that
doesn't get to userspace, you can boot with:

  trace_event=syscalls tp_printk=on

Which will trace syscalls from boot, and echo all output to the console.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/kernel: Make syscall_exit a local label
Michael Ellerman [Fri, 5 Dec 2014 10:16:59 +0000 (21:16 +1100)]
powerpc/kernel: Make syscall_exit a local label

Currently when we back trace something that is in a syscall we see
something like this:

[c000000000000000] [c000000000000000] SyS_read+0x6c/0x110
[c000000000000000] [c000000000000000] syscall_exit+0x0/0x98

Although it's entirely correct, seeing syscall_exit at the bottom can be
confusing - we were exiting from a syscall and then called SyS_read() ?

If we instead change syscall_exit to be a local label we get something
more intuitive:

[c0000001fa46fde0] [c00000000026719c] SyS_read+0x6c/0x110
[c0000001fa46fe30] [c000000000009264] system_call+0x38/0xd0

ie. we were handling a system call, and it was SyS_read().

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agocxl: Fix device_node reference counting
Ryan Grimm [Thu, 29 Jan 2015 02:16:04 +0000 (20:16 -0600)]
cxl: Fix device_node reference counting

When unbinding and rebinding the driver on a system with a card in PHB0, this
error condition is reached after a few attempts:

ERROR: Bad of_node_put() on /pciex@3fffe40000000
CPU: 0 PID: 3040 Comm: bash Not tainted 3.18.0-rc3-12545-g3627ffe #152
Call Trace:
[c000000721acb5c0] [c00000000086ef94] .dump_stack+0x84/0xb0 (unreliable)
[c000000721acb640] [c00000000073a0a8] .of_node_release+0xd8/0xe0
[c000000721acb6d0] [c00000000044bc44] .kobject_release+0x74/0xe0
[c000000721acb760] [c0000000007394fc] .of_node_put+0x1c/0x30
[c000000721acb7d0] [c000000000545cd8] .cxl_probe+0x1a98/0x1d50
[c000000721acb900] [c0000000004845a0] .local_pci_probe+0x40/0xc0
[c000000721acb980] [c000000000484998] .pci_device_probe+0x128/0x170
[c000000721acba30] [c00000000052400c] .driver_probe_device+0xac/0x2a0
[c000000721acbad0] [c000000000522468] .bind_store+0x108/0x160
[c000000721acbb70] [c000000000521448] .drv_attr_store+0x38/0x60
[c000000721acbbe0] [c000000000293840] .sysfs_kf_write+0x60/0xa0
[c000000721acbc50] [c000000000292500] .kernfs_fop_write+0x140/0x1d0
[c000000721acbcf0] [c000000000208648] .vfs_write+0xd8/0x260
[c000000721acbd90] [c000000000208b18] .SyS_write+0x58/0x100
[c000000721acbe30] [c000000000009258] syscall_exit+0x0/0x98

We are missing a call to of_node_get(). pnv_pci_to_phb_node() should
call of_node_get() otherwise np's reference count isn't incremented and
it might go away. Rename pnv_pci_to_phb_node() to pnv_pci_get_phb_node()
so it's clear it calls of_node_get().

Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/mm: bail out early when flushing TLB page
Arseny Solokha [Fri, 30 Jan 2015 12:08:27 +0000 (19:08 +0700)]
powerpc/mm: bail out early when flushing TLB page

MMU_NO_CONTEXT is conditionally defined as 0 or (unsigned int)-1. However,
in __flush_tlb_page() a corresponding variable is only tested for open
coded 0, which can cause NULL pointer dereference if `mm' argument was
legitimately passed as such.

Bail out early in case the first argument is NULL, thus eliminate confusion
between different values of MMU_NO_CONTEXT and avoid disabling and then
re-enabling preemption unnecessarily.

Signed-off-by: Arseny Solokha <asolokha@kb.kras.ru>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc: defconfigs: add MTD_SPI_NOR (new dependency for M25P80)
Brian Norris [Thu, 1 May 2014 06:26:46 +0000 (23:26 -0700)]
powerpc: defconfigs: add MTD_SPI_NOR (new dependency for M25P80)

These defconfigs contain the CONFIG_M25P80 symbol, which is now
dependent on the MTD_SPI_NOR symbol. Add CONFIG_MTD_SPI_NOR to satisfy
the new dependency.

At the same time, drop the now-nonexistent CONFIG_MTD_CHAR symbol.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agoperf/powerpc: reset event hw state when adding it to the PMU
Alexandru-Cezar Sardan [Thu, 26 Jun 2014 08:58:58 +0000 (11:58 +0300)]
perf/powerpc: reset event hw state when adding it to the PMU

When adding an event to the PMU with PERF_EF_START the STOPPED and UPTODATE
flags need to be cleared in the hw.event status variable because they are
preventing the update of the event count on overflow interrupt.

Signed-off-by: Alexandru-Cezar Sardan <alexandru.sardan@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/qe: Use strlcpy()
Rickard Strandqvist [Sat, 26 Jul 2014 21:26:51 +0000 (23:26 +0200)]
powerpc/qe: Use strlcpy()

Replace strcpy and strncpy with strlcpy to avoid strings that are too
big, or lack null termination.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
[scottwood@freescale.com: cleaned up commit message]
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agoPowerPC-83xx: Deletion of an unnecessary check before the function call "of_node_put"
Markus Elfring [Sat, 22 Nov 2014 15:18:20 +0000 (16:18 +0100)]
PowerPC-83xx: Deletion of an unnecessary check before the function call "of_node_put"

The of_node_put() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc: dts: pq3/85xx: Fix GPIO address
Alessio Igor Bogani [Thu, 4 Dec 2014 09:23:11 +0000 (10:23 +0100)]
powerpc: dts: pq3/85xx: Fix GPIO address

Fix the GPIO address in the device tree to match the documented location.

Signed-off-by: Alessio Igor Bogani <alessio.bogani@elettra.eu>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/mpc85xx: Create dts components for the FSL QorIQ DPAA QMan
Kumar Gala [Mon, 8 Dec 2014 10:29:19 +0000 (04:29 -0600)]
powerpc/mpc85xx: Create dts components for the FSL QorIQ DPAA QMan

Change-Id: I16e63db731e55a3d60d4e147573c1af8718082d3
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Geoff Thorpe <Geoff.Thorpe@freescale.com>
Signed-off-by: Hai-Ying Wang <Haiying.Wang@freescale.com>
[Emil Medve: Sync with the upstream binding]
Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/mpc85xx: Create dts components for the FSL QorIQ DPAA BMan
Kumar Gala [Mon, 8 Dec 2014 10:29:18 +0000 (04:29 -0600)]
powerpc/mpc85xx: Create dts components for the FSL QorIQ DPAA BMan

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Geoff Thorpe <Geoff.Thorpe@freescale.com>
Signed-off-by: Hai-Ying Wang <Haiying.Wang@freescale.com>
[Emil Medve: Sync with the upstream binding]
Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agodt/bindings: b/qman: Add phandle to the portals
Emil Medve [Mon, 8 Dec 2014 10:29:17 +0000 (04:29 -0600)]
dt/bindings: b/qman: Add phandle to the portals

This supports SoC(s) with multiple B/QMan instances

Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agodt/bindings: b/qman: Fix the alloc-ranges in the example(s)
Emil Medve [Mon, 8 Dec 2014 10:29:16 +0000 (04:29 -0600)]
dt/bindings: b/qman: Fix the alloc-ranges in the example(s)

'ranges' are specified as <base size> not as <start end>

Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agomemory/fsl-corenet-cf: Add t1040 support
Scott Wood [Thu, 11 Dec 2014 00:56:22 +0000 (18:56 -0600)]
memory/fsl-corenet-cf: Add t1040 support

T1040 has a different version of corenet-cf, despite being incorrectly
labelled with a fsl,corenet2-cf compatible.  The t1040 version of
corenet-cf has a version register that can be read to distinguish.  The
t4240/b4860 version officially does not, but testing shows that it does
and has a different value, so use that.  If somehow this ends up not
being reliable and we treat a t4240/b4860 as a t1040 (the reverse
should not happen, as t1040's version register is official), currently
the worst that should happen is writing to reserved bits to enable
events that don't exist.

The changes to the t1040 version of corenet-cf that this driver cares
about are the addition of two new error events.  There are also changes
to the format of cecar2, which is printed, but not interpreted, by this
driver.

Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/85xx: Add support for Emerson/Artesyn MVME2500.
Alessio Igor Bogani [Thu, 11 Dec 2014 08:56:45 +0000 (09:56 +0100)]
powerpc/85xx: Add support for Emerson/Artesyn MVME2500.

Add support for the Artesyn MVME2500 Single Board Computer.

The MVME2500 is a 6U form factor VME64 computer with:

- A single Freescale QorIQ P2010 CPU
- 1 GB of DDR3 onboard memory
- Three Gigabit Ethernets
- Five 16550 compatible UARTS
- One USB 2.0 port, one SHDC socket and one SATA connector
- One PCI/PCI eXpress Mezzanine Card (PMC/XMC) Slot
- MultiProcessor Interrupt Controller (MPIC)
- A DS1375T Real Time Clock (RTC) and 512 KB of Non-Volatile Memory
- Two 64 KB EEPROMs
- U-Boot in 16 SPI Flash

This patch is based on linux-3.18 and has been boot tested.

Signed-off-by: Alessio Igor Bogani <alessio.bogani@elettra.eu>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/mpc85xx: Add ranges to etsec2 nodes
Scott Wood [Thu, 18 Dec 2014 01:06:31 +0000 (19:06 -0600)]
powerpc/mpc85xx: Add ranges to etsec2 nodes

Commit 746c9e9f92dd "of/base: Fix PowerPC address parsing hack" limited
the applicability of the workaround whereby a missing ranges is treated
as an empty ranges.  This workaround was hiding a bug in the etsec2
device tree nodes, which have children with reg, but did not have
ranges.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Reported-by: Alexander Graf <agraf@suse.de>
9 years agopowerpc/config: Enable MDIO support
Andy Fleming [Tue, 23 Dec 2014 10:17:56 +0000 (18:17 +0800)]
powerpc/config: Enable MDIO support

Also, enable Vitesse PHY and fixed PHY support.

Signed-off-by: Andy Fleming <afleming@gmail.com>
Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc: Add machine_check cpu function for e300c3 cpus
Esben Haabendal [Tue, 6 Jan 2015 11:26:59 +0000 (12:26 +0100)]
powerpc: Add machine_check cpu function for e300c3 cpus

Signed-off-by: Esben Haabendal <eha@deif.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/8xx: Remove duplicated code in set_context()
LEROY Christophe [Tue, 20 Jan 2015 09:57:34 +0000 (10:57 +0100)]
powerpc/8xx: Remove duplicated code in set_context()

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/8xx: Optimise access to swapper_pg_dir
LEROY Christophe [Tue, 20 Jan 2015 09:57:34 +0000 (10:57 +0100)]
powerpc/8xx: Optimise access to swapper_pg_dir

All accessed to PGD entries are done via 0(r11).
By using lower part of swapper_pg_dir as load index to r11, we can remove the
ori instruction.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/8xx: Take benefit of aligned PGDIR
LEROY Christophe [Tue, 20 Jan 2015 09:57:34 +0000 (10:57 +0100)]
powerpc/8xx: Take benefit of aligned PGDIR

L1 base address is now aligned so we can insert L1 index into r11 directly and
then preserve r10

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc32: Use kmem_cache memory for PGDIR
LEROY Christophe [Tue, 20 Jan 2015 09:57:34 +0000 (10:57 +0100)]
powerpc32: Use kmem_cache memory for PGDIR

When pages are not 4K, PGDIR table is allocated with kmalloc(). In order to
optimise TLB handlers, aligned memory is needed. kmalloc() doesn't provide
aligned memory blocks, so lets use a kmem_cache pool instead.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/8xx: remove tests on PGDIR entry validity
LEROY Christophe [Tue, 20 Jan 2015 09:57:33 +0000 (10:57 +0100)]
powerpc/8xx: remove tests on PGDIR entry validity

Kernel MMU handling code handles validity of entries via _PMD_PRESENT which
corresponds to V bit in MD_TWC and MI_TWC. When the V bit is not set, MPC8xx
triggers TLBError exception. So we don't have to check that and branch ourself
to TLBError. We can set TLB entries with non present entries, remove all those
tests and let the 8xx handle it. This reduce the number of cycle when the
entries are valid which is the case most of the time, and doesn't significantly
increase the time for handling invalid entries.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/8xx: remove remaining unnecessary code in FixupDAR
LEROY Christophe [Tue, 20 Jan 2015 09:57:33 +0000 (10:57 +0100)]
powerpc/8xx: remove remaining unnecessary code in FixupDAR

Since commit 33fb845a6f01 ("powerpc/8xx: Don't use MD_TWC for walk"), MD_EPN and
MD_TWC are not writen anymore in FixupDAR so saving r3 has become useless.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/8xx: reduce pressure on TLB due to context switches
LEROY Christophe [Mon, 19 Jan 2015 15:44:42 +0000 (16:44 +0100)]
powerpc/8xx: reduce pressure on TLB due to context switches

For nohash powerpc, when we run out of contexts, contexts are freed by stealing
used contexts in-turn. When a victim has been selected, the associated TLB
entries are freed using _tlbil_pid(). Unfortunatly, on the PPC 8xx, _tlbil_pid()
does a tlbia, hence flushes ALL TLB entries and not only the one linked to the
stolen context. Therefore, as implented today, at each task switch requiring a
new context, all entries are flushed.

This patch modifies the implementation so that when running out of contexts, all
contexts get freed at once, hence dividing the number of calls to tlbia by 16.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopower/fsl: add MDIO dt binding for FMan
Shaohui Xie [Wed, 28 Jan 2015 11:54:24 +0000 (19:54 +0800)]
power/fsl: add MDIO dt binding for FMan

This binding is for FMan MDIO, it covers FMan v2 & FMan v3.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
[scottwood@freescale.com: mark interrupts required only for external]
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/8xx: use _PAGE_RO instead of _PAGE_RW
LEROY Christophe [Mon, 19 Jan 2015 16:04:44 +0000 (17:04 +0100)]
powerpc/8xx: use _PAGE_RO instead of _PAGE_RW

On powerpc 8xx, in TLB entries, 0x400 bit is set to 1 for read-only pages
and is set to 0 for RW pages. So we should use _PAGE_RO instead of _PAGE_RW

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc32: adds handling of _PAGE_RO
LEROY Christophe [Mon, 19 Jan 2015 16:04:38 +0000 (17:04 +0100)]
powerpc32: adds handling of _PAGE_RO

Some powerpc like the 8xx don't have a RW bit in PTE bits but a RO
(Read Only) bit.  This patch implements the handling of a _PAGE_RO flag
to be used in place of _PAGE_RW

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[scottwood@freescale.com: fix whitespace]
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/perf: fix fsl_emb_pmu_start to write correct pmc value
Tom Huynh [Tue, 20 Jan 2015 22:19:50 +0000 (16:19 -0600)]
powerpc/perf: fix fsl_emb_pmu_start to write correct pmc value

PMCs on PowerPC increases towards 0x80000000 and triggers an overflow
interrupt when the msb is set to collect a sample. Therefore, to setup
for the next sample collection, pmu_start should set the pmc value to
0x80000000 - left instead of left which incorrectly delays the next
overflow interrupt. Same as commit 9a45a9407c69 ("powerpc/perf:
power_pmu_start restores incorrect values, breaking frequency events")
for book3s.

Signed-off-by: Tom Huynh <tom.huynh@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc: Remove duplicate tlbcam_index declarations
Emil Medve [Wed, 21 Jan 2015 22:22:52 +0000 (16:22 -0600)]
powerpc: Remove duplicate tlbcam_index declarations

They seem to be leftovers from '14cf11a powerpc: Merge enough to start
building in arch/powerpc'

Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/dts: Remove T4240 emulator support
Emil Medve [Wed, 21 Jan 2015 22:31:50 +0000 (16:31 -0600)]
powerpc/dts: Remove T4240 emulator support

Probably we should have not upstreamed this in the first place

Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/fsl_pci: Fix pci stack build bug with FRAME_WARN
Kim Phillips [Fri, 23 Jan 2015 01:05:06 +0000 (19:05 -0600)]
powerpc/fsl_pci: Fix pci stack build bug with FRAME_WARN

Fix this:

  CC      arch/powerpc/sysdev/fsl_pci.o
arch/powerpc/sysdev/fsl_pci.c: In function 'fsl_pcie_check_link':
arch/powerpc/sysdev/fsl_pci.c:91:1: error: the frame size of 1360 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

when configuring FRAME_WARN, by refactoring indirect_read_config()
to take hose and bus number instead of the 1344-byte struct pci_bus.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
9 years agopowerpc/powernv: Don't alloc IRQ map if necessary
Gavin Shan [Fri, 23 Jan 2015 03:25:06 +0000 (14:25 +1100)]
powerpc/powernv: Don't alloc IRQ map if necessary

On PowerNV platform, the OPAL interrupts are exported by firmware
through device-node property (/ibm,opal::opal-interrupts). Under
some extreme circumstances (e.g. simulator), we don't have this
property found from the device tree. For that case, we shouldn't
allocate the interrupt map. Otherwise, slab complains allocating
zero sized memory chunk.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/powernv: Separate function for OPAL IRQ setup
Gavin Shan [Fri, 23 Jan 2015 03:25:05 +0000 (14:25 +1100)]
powerpc/powernv: Separate function for OPAL IRQ setup

The patch put the OPAL interrupt setup logic in opal_init() into
seperate function opal_irq_init() for easier code maintaining. The
patch doesn't introduce logic changes except:

   * Rename variable names.
   * Release virtual IRQ upon error from request_irq().
   * Don't cache the virtual IRQ to opal_irqs[] upon error from
     request_irq().

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/powernv: Remove "opal" prefix from pr_xxx()s
Michael Ellerman [Wed, 28 Jan 2015 04:10:33 +0000 (15:10 +1100)]
powerpc/powernv: Remove "opal" prefix from pr_xxx()s

In commit c8742f85125d "powerpc/powernv: Expose OPAL firmware symbol
map" I added pr_fmt() to opal.c. This left some existing pr_xxx()s with
duplicate "opal" prefixes, eg:

    opal: opal: Found 0 interrupts reserved for OPAL

Fix them all up. Also make the "Not not found" message a bit more
verbose.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Remove some unused functions
Michael Ellerman [Tue, 27 Jan 2015 05:48:03 +0000 (16:48 +1100)]
powerpc: Remove some unused functions

Remove slice_set_psize() which is not used.

It was added in 3a8247cc2c85 "powerpc: Only demote individual slices
rather than whole process" but was never used.

Remove vsx_assist_exception() which is not used.

It was added in ce48b2100785 "powerpc: Add VSX context save/restore,
ptrace and signal support" but was never used.

Remove generic_mach_cpu_die() which is not used.

Its last caller was removed in 375f561a4131 "powerpc/powernv: Always go
into nap mode when CPU is offline".

Remove mpc7448_hpc2_power_off() and mpc7448_hpc2_halt() which are
unused.

These were introduced in c5d56332fd6c "[POWERPC] Add general support for
mpc7448hpc2 (Taiga) platform" but were never used.

This was partially found by using a static code analysis program called
cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
[mpe: Update changelog with details on when/why they are unused]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/lib: Makefile, use obj64-y to consolidate 64-bit rules
Michael Ellerman [Mon, 22 Dec 2014 04:18:43 +0000 (15:18 +1100)]
powerpc/lib: Makefile, use obj64-y to consolidate 64-bit rules

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/lib: Makefile, consolidate obj-y sections
Michael Ellerman [Mon, 22 Dec 2014 04:14:24 +0000 (15:14 +1100)]
powerpc/lib: Makefile, consolidate obj-y sections

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/mm: fix undefined reference to `.__kernel_map_pages' on FSL PPC64
Kim Phillips [Mon, 26 Jan 2015 19:22:22 +0000 (13:22 -0600)]
powerpc/mm: fix undefined reference to `.__kernel_map_pages' on FSL PPC64

arch/powerpc has __kernel_map_pages implementations in mm/pgtable_32.c, and
mm/hash_utils_64.c, of which the former is built for PPC32, and the latter
for PPC64 machines with PPC_STD_MMU.  Fix arch/powerpc/Kconfig to not select
ARCH_SUPPORTS_DEBUG_PAGEALLOC when CONFIG_PPC_STD_MMU_64 isn't defined,
i.e., for 64-bit book3e builds to use the generic __kernel_map_pages()
in mm/debug-pagealloc.c.

  LD      init/built-in.o
mm/built-in.o: In function `kernel_map_pages':
include/linux/mm.h:2076: undefined reference to `.__kernel_map_pages'
include/linux/mm.h:2076: undefined reference to `.__kernel_map_pages'
include/linux/mm.h:2076: undefined reference to `.__kernel_map_pages'
Makefile:925: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/powernv: Skip registering log region when CONFIG_PRINTK=n
Pranith Kumar [Thu, 22 Jan 2015 02:26:09 +0000 (21:26 -0500)]
powerpc/powernv: Skip registering log region when CONFIG_PRINTK=n

When CONFIG_PRINTK=n, log_buf_addr_get() returns NULL and log_buf_len_get()
return 0. Check for these return values and skip registering the dump buffer.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/pseries: Fix endian problems with LE migration
Cyril Bur [Wed, 21 Jan 2015 02:32:00 +0000 (13:32 +1100)]
powerpc/pseries: Fix endian problems with LE migration

RTAS events require arguments be passed in big endian while hypercalls
have their arguments passed in registers and the values should therefore
be in CPU endian.

The "ibm,suspend_me" 'RTAS' call makes a sequence of hypercalls to setup
one true RTAS call. This means that "ibm,suspend_me" is handled
specially in the ppc_rtas() syscall.

The ppc_rtas() syscall has its arguments in big endian and can therefore
pass these arguments directly to the RTAS call. "ibm,suspend_me" is
handled specially from within ppc_rtas() (by calling rtas_ibm_suspend_me())
which has left an endian bug on little endian systems due to the
requirement of hypercalls. The return value from rtas_ibm_suspend_me()
gets returned in cpu endian, and is left unconverted, also a bug on
little endian systems.

rtas_ibm_suspend_me() does not actually make use of the rtas_args that
it is passed. This patch removes the convoluted use of the rtas_args
struct to pass params to rtas_ibm_suspend_me() in favour of passing what
it needs as actual arguments. This patch also ensures the two callers of
rtas_ibm_suspend_me() pass function parameters in cpu endian and in the
case of ppc_rtas(), converts the return value.

migrate_store() (the other caller of rtas_ibm_suspend_me()) is from a
sysfs file which deals with everything in cpu endian so this function
only underwent cleanup.

This patch has been tested with KVM both LE and BE and on PowerVM both
LE and BE. Under QEMU/KVM the migration happens without touching these
code pathes.

For PowerVM there is no obvious regression on BE and the LE code path
now provides the correct parameters to the hypervisor.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agoselftests/powerpc: Add memcmp testcase
Anton Blanchard [Wed, 21 Jan 2015 01:27:39 +0000 (12:27 +1100)]
selftests/powerpc: Add memcmp testcase

Add a testcase for the new ppc64 memcmp.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Add 64bit optimised memcmp
Anton Blanchard [Wed, 21 Jan 2015 01:27:38 +0000 (12:27 +1100)]
powerpc: Add 64bit optimised memcmp

I noticed ksm spending quite a lot of time in memcmp on a large
KVM box. The current memcmp loop is very unoptimised - byte at a
time compares with no loop unrolling. We can do much much better.

Optimise the loop in a few ways:

- Unroll the byte at a time loop

- For large (at least 32 byte) comparisons that are also 8 byte
  aligned, use an unrolled modulo scheduled loop using 8 byte
  loads. This is similar to our glibc memcmp.

A simple microbenchmark testing 10000000 iterations of an 8192 byte
memcmp was used to measure the performance:

baseline: 29.93 s

modified:  1.70 s

Just over 17x faster.

v2: Incorporated some suggestions from Segher:

- Use andi. instead of rdlicl.

- Convert bdnzt eq, to bdnz. It's just duplicating the earlier compare
  and was a relic from a previous version.

- Don't use cr5, we have plans to use that CR field for fast local
  atomics.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/powernv: Remove pnv_pci_probe_mode()
Gavin Shan [Thu, 11 Dec 2014 06:00:58 +0000 (17:00 +1100)]
powerpc/powernv: Remove pnv_pci_probe_mode()

The callback (ppc_md.pci_probe_mode()) is used to determine if the
child PCI devices of the indicated PCI bus should be probed from
device-tree or hardware. On PowerNV platform, we always expect
probing PCI devices from hardware, which is PowerPC PCI core's
default behaviour. Also, the callback had some delay implemented
based on PHB's device node property "reset-clear-timestamp", which
wasn't exported from skiboot. So we don't need this function and
it's safe to remove it.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/eeh: Allow to set maximal frozen times
Gavin Shan [Thu, 11 Dec 2014 03:28:56 +0000 (14:28 +1100)]
powerpc/eeh: Allow to set maximal frozen times

When PE's frozen count hits maximal allowed frozen times, which is
5 currently, it will be forced to be offline permanently. Once the
PE is removed permanently, rebooting machine is required to bring
the PE back. It's not convienent when testing EEH functionality.

The patch exports the maximal allowed frozen times through debugfs
entry (/sys/kernel/debug/powerpc/eeh_max_freezes).

Requested-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/eeh: Introduce flag EEH_PE_REMOVED
Gavin Shan [Thu, 11 Dec 2014 03:28:55 +0000 (14:28 +1100)]
powerpc/eeh: Introduce flag EEH_PE_REMOVED

The conditions that one specific PE's frozen count exceeds the maximal
allowed times (EEH_MAX_ALLOWED_FREEZES) and it's in isolated or recovery
state indicate the PE was removed permanently implicitly. The patch
introduces flag EEH_PE_REMOVED to indicate that explicitly so that we
don't depend on the fixed maximal allowed times, which can be varied as
we do in subsequent patch.

Flag EEH_PE_REMOVED is expected to be marked for the PE whose frozen
count exceeds the maximal allowed times, or just failed from recovery.

Requested-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/eeh: Fix missed PE#0 on P7IOC
Gavin Shan [Mon, 24 Nov 2014 22:27:00 +0000 (09:27 +1100)]
powerpc/eeh: Fix missed PE#0 on P7IOC

PE#0 should be regarded as valid for P7IOC, while it's invalid for
PHB3. The patch adds flag EEH_VALID_PE_ZERO to differentiate those
two cases. Without the patch, we possibly see frozen PE#0 state is
cleared without EEH recovery taken on P7IOC as following kernel logs
indicate:

[root@ltcfbl8eb ~]# dmesg
       :
pci 0000:00     : [PE# 000] Secondary bus 0 associated with PE#0
pci 0000:01     : [PE# 001] Secondary bus 1 associated with PE#1
pci 0001:00     : [PE# 000] Secondary bus 0 associated with PE#0
pci 0001:01     : [PE# 001] Secondary bus 1 associated with PE#1
pci 0002:00     : [PE# 000] Secondary bus 0 associated with PE#0
pci 0002:01     : [PE# 001] Secondary bus 1 associated with PE#1
pci 0003:00     : [PE# 000] Secondary bus 0 associated with PE#0
pci 0003:01     : [PE# 001] Secondary bus 1 associated with PE#1
pci 0003:20     : [PE# 002] Secondary bus 32..63 associated with PE#2
       :
EEH: Clear non-existing PHB#3-PE#0
EEH: PHB location: U78AE.001.WZS00M9-P1-002

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/kernel: Avoid memory corruption at early stage
Gavin Shan [Thu, 8 Jan 2015 05:40:51 +0000 (16:40 +1100)]
powerpc/kernel: Avoid memory corruption at early stage

When calling to early_setup(), we pick "boot_paca" up for the master CPU
and initialize that with initialise_paca(). At that point, the SLB
shadow buffer isn't populated yet. Updating the SLB shadow buffer should
corrupt what we had in physical address 0 where the trap instruction is
usually stored.

This hasn't been observed to cause any trouble in practice, but is
obviously fishy.

Fixes: 6f4441ef7009 ("powerpc: Dynamically allocate slb_shadow from memblock")
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Replace cpumask_weight(cpu_possible_mask) with num_possible_cpus()
Emil Medve [Wed, 21 Jan 2015 22:21:14 +0000 (16:21 -0600)]
powerpc: Replace cpumask_weight(cpu_possible_mask) with num_possible_cpus()

num_possible_cpus() is just a shorthand for it.

Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/kprobes: Fix kallsyms lookup across powerpc ABIv1 and ABIv2
Naveen N. Rao [Mon, 15 Dec 2014 14:50:31 +0000 (20:20 +0530)]
powerpc/kprobes: Fix kallsyms lookup across powerpc ABIv1 and ABIv2

Currently, all non-dot symbols are being treated as function descriptors
in ABIv1. This is incorrect and is resulting in perf probe not working:

  # perf probe do_fork
  Added new event:
  Failed to write event: Invalid argument
    Error: Failed to add events.
  # dmesg | tail -1
  [192268.073063] Could not insert probe at _text+768432: -22

perf probe bases all kernel probes on _text and writes,
for example, "p:probe/do_fork _text+768432" to
/sys/kernel/debug/tracing/kprobe_events. In-kernel, _text is being
considered to be a function descriptor and is resulting in the above
error.

Fix this by changing how we lookup symbol addresses on ppc64. We first
check for the dot variant of a symbol and look at the non-dot variant
only if that fails. In this manner, we avoid having to look at the
function descriptor.

While at it, also separate out how this works on ABIv2 where
we don't have dot symbols, but need to use the local entry point.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Rename _TIF_SYSCALL_T_OR_A to _TIF_SYSCALL_DOTRACE
Michael Ellerman [Thu, 15 Jan 2015 01:01:42 +0000 (12:01 +1100)]
powerpc: Rename _TIF_SYSCALL_T_OR_A to _TIF_SYSCALL_DOTRACE

Once upon a time, at least 9 years ago (< 2.6.12), _TIF_SYSCALL_T_OR_A
meant "TRACE or AUDIT". But these days it means TRACE or AUDIT or
SECCOMP or TRACEPOINT or NOHZ.

All of those are implemented via syscall_dotrace() so rename the flag to
that to try and clarify things.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Remove unused CPU_FTR_IABR
Michael Ellerman [Thu, 15 Jan 2015 01:24:00 +0000 (12:24 +1100)]
powerpc: Remove unused CPU_FTR_IABR

We removed the last usage of CPU_FTR_IABR in commit 1ad7d70562ee
"powerpc/xmon: Enable HW instruction breakpoint on POWER8".

Mark it as free.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agoselftests/powerpc: Add subpage protection self test.
Paul Mackerras [Tue, 9 Dec 2014 06:14:07 +0000 (11:44 +0530)]
selftests/powerpc: Add subpage protection self test.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
mpe: Fix compile errors and formatting. Add tempfile logic to Makefile.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agoselftests/powerpc: Make git ignore all binaries in powerpc test suite
Anshuman Khandual [Wed, 14 Jan 2015 07:08:50 +0000 (12:38 +0530)]
selftests/powerpc: Make git ignore all binaries in powerpc test suite

This patch includes all of the powerpc test binaries into the .gitignore
file listing in their respective directories. This will make sure that
git ignores all of these test binaries when displaying status.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/pci: remove the multi-init for pci_dn->phb
Wei Yang [Mon, 15 Dec 2014 01:45:00 +0000 (09:45 +0800)]
powerpc/pci: remove the multi-init for pci_dn->phb

pci_dn->phb is set to phb in update_dn_pci_info(), if succeed.

This patch removes the duplication of pci_dn->phb initialization.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowernv/iommu: disable IOMMU bypass with param iommu=nobypass
Thadeu Lima de Souza Cascardo [Thu, 23 Oct 2014 21:19:35 +0000 (19:19 -0200)]
powernv/iommu: disable IOMMU bypass with param iommu=nobypass

When IOMMU bypass is enabled, a PCI device can read and write memory
that was not mapped by the driver without causing an EEH. That might
cause memory corruption, for example.

When we disable bypass, DMA reads and writes to addresses not mapped by
the IOMMU will cause an EEH, allowing us to debug such issues.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/pseries: All events of EPOW_SYSTEM_SHUTDOWN must initiate shutdown
Anshuman Khandual [Tue, 21 Oct 2014 08:11:29 +0000 (13:41 +0530)]
powerpc/pseries: All events of EPOW_SYSTEM_SHUTDOWN must initiate shutdown

The current handling of EPOW_SHUTDOWN_ON_UPS event does not shutdown the
system after logging the message. All the events of EPOW_SYSTEM_SHUTDOWN
action code (EPOW_SHUTDOWN_ON_UPS is a part of it) must initiate system
shutdown as per the SPAPR spec. If the LPAR does not shutdown after
receiving this rtas based event, it will expose itself to a forced
abrupt shutdown initiated by the platform firmware. This patch fixes the
situation.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/powernv: Print the M64 range information in bootup log
Wei Yang [Fri, 12 Dec 2014 04:39:37 +0000 (12:39 +0800)]
powerpc/powernv: Print the M64 range information in bootup log

The M64 range information is missed in dmesg, which would be helpful in debug.

This patch prints the M64 range information in the same format as M32.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agocxl: Add ability to reset the card
Ryan Grimm [Mon, 19 Jan 2015 17:52:51 +0000 (11:52 -0600)]
cxl: Add ability to reset the card

Adds reset to sysfs which will PERST the card. If load_image_on_perst is set
to "user" or "factory", the PERST will cause that image to be loaded.

load_image_on_perst is set to "user" for production.

"none" could be used for debugging. The PSL trace arrays are preserved which
then can be read through debugfs.

PERST also triggers CAPP recovery. An HMI comes in, which is handled by EEH.
EEH unbinds the driver, calls into Sapphire to reinitialize the PHB, then
rebinds the driver.

Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agocxl: Enable CAPP recovery
Ryan Grimm [Mon, 19 Jan 2015 17:52:50 +0000 (11:52 -0600)]
cxl: Enable CAPP recovery

Turning snoops on is the last step in CAPP recovery. Sapphire is expected to
have reinitialized the PHB and done the previous recovery steps.

Add mode argument to opal call to do this. Driver can turn snoops off although
it does not currently.

Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agocxl: Add image control to sysfs
Ryan Grimm [Mon, 19 Jan 2015 17:52:49 +0000 (11:52 -0600)]
cxl: Add image control to sysfs

load_image_on_perst identifies whether a PERST will cause the image to be
flashed to the card. And if so, which image.

Valid entries are: "none", "user" and "factory".

A value of "none" means PERST will not cause the image to be flashed. A
power cycle to the pcie slot is required to load the image.

"user" loads the user provided image and "factory" loads the factory image upon
PERST.

sysfs updates the cxl struct in the driver then calls cxl_update_image_control
to write the vals in the VSEC.

Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agocxl: Use image state defaults for reloading FPGA
Ryan Grimm [Mon, 19 Jan 2015 17:52:48 +0000 (11:52 -0600)]
cxl: Use image state defaults for reloading FPGA

Select defaults such that a PERST causes flash image reload.  Select which
image based on what the card is set up to load.

CXL_VSEC_PERST_LOADS_IMAGE selects whether PERST assertion causes flash image
load.

CXL_VSEC_PERST_SELECT_USER selects which image is loaded on the next PERST.

cxl_update_image_control writes these bits into the VSEC.

Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agocxl: Update CXL ABI documentation
Philippe Bergheaud [Fri, 12 Dec 2014 10:28:53 +0000 (11:28 +0100)]
cxl: Update CXL ABI documentation

This fixes two typos and explains where shared attributes are stored.

Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agocxl: Add tracepoints
Ian Munsie [Fri, 9 Jan 2015 09:34:36 +0000 (20:34 +1100)]
cxl: Add tracepoints

This patch adds tracepoints throughout the cxl driver, which can provide
insight into:

- Context lifetimes
- Commands sent to the PSL and AFU and their completion status
- Segment and page table misses and their resolution
- PSL and AFU interrupts
- slbia calls from the powerpc copro_fault code

These tracepoints are mostly intended to aid in debugging (particularly
for new AFU designs), and may be useful standalone or in conjunction
with hardware traces collected by the PSL (read out via the trace
interface in debugfs) and AFUs.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agocxl: remove redundant increment of hwirq
Colin Ian King [Thu, 8 Jan 2015 22:36:47 +0000 (22:36 +0000)]
cxl: remove redundant increment of hwirq

hwirq has not been initialized, however it is being incremented
and also not being referenced in a loop.  This error was detected with
cppcheck:

[drivers/misc/cxl/irq.c:439]: (error) Uninitialized variable: hwirq

Commit 80fa93fce37d ("cxl: Name interrupts in /proc/interrupt")
introduced this error.

This is a simple fix that removes the redundant increment.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-By: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/ps3: Enable CONFIG_PS3_REPOSITORY_WRITE in ps3_defconfig
Michael Ellerman [Tue, 20 Jan 2015 07:08:36 +0000 (18:08 +1100)]
powerpc/ps3: Enable CONFIG_PS3_REPOSITORY_WRITE in ps3_defconfig

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/ps3: Fix sys-manager-core sparse warnings
Geoff Levand [Tue, 13 Jan 2015 01:00:20 +0000 (01:00 +0000)]
powerpc/ps3: Fix sys-manager-core sparse warnings

Fixes warnings like these:

  drivers/ps3/sys-manager-core.c: error: symbol 'ps3_sys_manager_power_off' redeclared with different type

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/ps3: Fix vuart sparse warnings
Geoff Levand [Tue, 13 Jan 2015 01:00:20 +0000 (01:00 +0000)]
powerpc/ps3: Fix vuart sparse warnings

Fix sparse warnings like these:

  drivers/ps3/ps3-vuart.c: warning: symbol 'ps3_vuart_disable_interrupt_tx' was not declared. Should it be static?

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/ps3: Write highmem info to repository
Geoff Levand [Tue, 13 Jan 2015 01:00:20 +0000 (01:00 +0000)]
powerpc/ps3: Write highmem info to repository

Add calls to the ps3_mm_set_repository_highmem() routine when the ps3
r1 highmem region is either created or destroyed.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/ps3: Add ps3_mm_set_repository_highmem
Geoff Levand [Tue, 13 Jan 2015 01:00:20 +0000 (01:00 +0000)]
powerpc/ps3: Add ps3_mm_set_repository_highmem

Add the new routine ps3_mm_set_repository_highmem() that saves highmem info to
the LV1 hypervisor registry so that the info will be available to second stage
OS's loaded by petitboot/kexec. FreeBSD and some Linux derivatives use
this feature.

Also, move the existing ps3_mm_get_repository_highmem() routine up in
the source file.

This implementation of ps3_mm_set_repository_highmem() assumes the repository
will have a single highmem region entry (at index 0).

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc/ps3: Add empty repository highmem routines
Geoff Levand [Tue, 13 Jan 2015 01:00:20 +0000 (01:00 +0000)]
powerpc/ps3: Add empty repository highmem routines

To avoid the need for preprocessor conditionals in C source files add a set of
empty inline repository highmem write routines to platform.h that are used when
CONFIG_PS3_REPOSITORY_WRITE is not defined.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Update G5 defconfig
Michael Ellerman [Thu, 22 Jan 2015 05:49:03 +0000 (16:49 +1100)]
powerpc: Update G5 defconfig

Add CGROUPS and DEVTMPFS, which allows booting with newer userspaces.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Enable NUMA balancing in pseries[_le]_defconfig
Michael Neuling [Tue, 21 Oct 2014 05:32:07 +0000 (16:32 +1100)]
powerpc: Enable NUMA balancing in pseries[_le]_defconfig

Distros are enabling NUMA balancing (eg Ubuntu), so it would be good to
get some more test coverage with it.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Enable various container features on pseries defconfigs.
Anton Blanchard [Mon, 19 Jan 2015 23:24:24 +0000 (10:24 +1100)]
powerpc: Enable various container features on pseries defconfigs.

Enable config options required by lxc and docker.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Enable overlayfs on pseries and ppc64 defconfigs
Anton Blanchard [Mon, 19 Jan 2015 23:24:23 +0000 (10:24 +1100)]
powerpc: Enable overlayfs on pseries and ppc64 defconfigs

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Enable KSM on pseries and ppc64 defconfigs
Anton Blanchard [Mon, 19 Jan 2015 23:24:22 +0000 (10:24 +1100)]
powerpc: Enable KSM on pseries and ppc64 defconfigs

KSM will only be used on areas marked for merging via madvise, and it
is showing nice improvements on KVM workloads, so enable it by
default.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Enable CONFIG_SATA_AHCI on pseries and ppc64 defconfigs
Anton Blanchard [Mon, 19 Jan 2015 23:24:21 +0000 (10:24 +1100)]
powerpc: Enable CONFIG_SATA_AHCI on pseries and ppc64 defconfigs

We are starting to see ppc64 boxes with SATA AHCI adapters in it,
so enable it in our defconfigs.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Enable on demand governor on ppc64_defconfig
Anton Blanchard [Mon, 19 Jan 2015 23:24:20 +0000 (10:24 +1100)]
powerpc: Enable on demand governor on ppc64_defconfig

This was enabled on the pseries defconfigs recently, but missed
the ppc64 one.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
9 years agopowerpc: Update all configs using savedefconfig
Michael Ellerman [Tue, 20 Jan 2015 06:36:53 +0000 (17:36 +1100)]
powerpc: Update all configs using savedefconfig

It looks like it's ~4 years since we updated some of these, so do a bulk
update.

Verified that the before and after generated configs are exactly the
same.

Which begs the question why update them? The answer is that it can be
confusing when the stored defconfig drifts too far from the generated
result.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agopowerpc/kvm: Create proper names for the kvm_host_state PMU fields
Michael Ellerman [Thu, 10 Jul 2014 09:34:31 +0000 (19:34 +1000)]
powerpc/kvm: Create proper names for the kvm_host_state PMU fields

We have two arrays in kvm_host_state that contain register values for
the PMU. Currently we only create an asm-offsets symbol for the base of
the arrays, and do the array offset in the assembly code.

Creating an asm-offsets symbol for each field individually makes the
code much nicer to read, particularly for the MMCRx/SIxR/SDAR fields, and
might have helped us notice the recent double restore bug we had in this
code.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Alexander Graf <agraf@suse.de>
10 years agopowerpc/lib: Do not include string.o in obj-y twice
Andreas Ruprecht [Wed, 17 Dec 2014 11:05:13 +0000 (12:05 +0100)]
powerpc/lib: Do not include string.o in obj-y twice

In the Makefile, string.o (which is generated from string.S) is
included into the list of objects being built unconditionally
(obj-y) in line 12.

Additionally, if CONFIG_PPC64 is set, it is included again in
line 17.

This patch removes the latter unnecessary inclusion.

Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agopowerpc/44x/Akebono: Remove select of IBM_EMAC_RGMII_WOL
Paul Bolle [Tue, 23 Dec 2014 00:32:07 +0000 (11:32 +1100)]
powerpc/44x/Akebono: Remove select of IBM_EMAC_RGMII_WOL

Commit 2a2c74b2efcb ("IBM Akebono: Add the Akebono platform") added a
select of IBM_EMAC_RGMII_WOL. But that Kconfig symbol isn't (yet) part
of the tree. So this select has been a nop since that commit was
included in v3.16-rc1.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agocxl: Disable SPAP register when freeing SPA
Ian Munsie [Mon, 8 Dec 2014 08:18:00 +0000 (19:18 +1100)]
cxl: Disable SPAP register when freeing SPA

When we deactivate the AFU directed mode we free the scheduled process
area, but did not clear the register in the hardware that has a pointer
to it.

This should be fine since we will have already cleared out every context
and we won't do anything that would cause the hardware to access it
until after we have allocated a new one, but just to be safe this patch
clears out the register when we free the page.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agocxl: Disable AFU debug flag
Ian Munsie [Mon, 8 Dec 2014 08:17:59 +0000 (19:17 +1100)]
cxl: Disable AFU debug flag

Upon inspection of the implementation specific registers, it was
discovered that the high bit of the implementation specific RXCTL
register was enabled, which enables the DEADB00F debug feature.

The debug feature causes MMIO reads to a disabled AFU to respond with
0xDEADB00F instead of all Fs. In general this should not be visible as
the kernel will only allow MMIO access to enabled AFUs, but there may be
some circumstances where an AFU may become disabled while it is use.
One such case would be an AFU designed to only be used in the dedicated
process mode and to disable itself after it has completed it's work
(however even in that case the effects of this debug flag would be
limited as the userspace application must have completed any required
MMIO accesses before the AFU disables itself with or without the flag).

This patch removes the debug flag and replaces the magic value
programmed into this register with a preprocessor define so it is
clearer what the rest of this initialisation does.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agocxl: Early return from cxl_handle_fault for a shut down context
Ian Munsie [Mon, 8 Dec 2014 08:17:58 +0000 (19:17 +1100)]
cxl: Early return from cxl_handle_fault for a shut down context

If a context is being detached and we get a translation fault for it
there is little point getting it's mm and handling the fault, so just
respond with an address error and return earlier.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agocxl: Fix leaking interrupts if attach process fails
Ian Munsie [Mon, 8 Dec 2014 08:17:57 +0000 (19:17 +1100)]
cxl: Fix leaking interrupts if attach process fails

In this particular error path we have already allocated the AFU
interrupts, but have not yet set the status to STARTED. The detach
context code will only attempt to release the interrupts if the context
is in state STARTED, so in this case the interrupts would remain
allocated.

This patch releases the AFU interrupts immediately if the attach call
fails to prevent them leaking.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agopowerpc/4xx: Fix return value check in hsta_msi_probe()
Wei Yongjun [Sun, 20 Jul 2014 07:20:59 +0000 (15:20 +0800)]
powerpc/4xx: Fix return value check in hsta_msi_probe()

In case of error, the function ioremap() returns NULL
not ERR_PTR(). The IS_ERR() test in the return value
check should be replaced with NULL test.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agopowerpc/xmon: use isspace/isxdigit/isalnum from linux/ctype.h
Vincent Bernat [Tue, 15 Jul 2014 11:43:47 +0000 (13:43 +0200)]
powerpc/xmon: use isspace/isxdigit/isalnum from linux/ctype.h

isxdigit() macro definition is the same.

isalnum() from linux/ctype.h will accept additional latin non-ASCII
characters. This is harmless since this macro is used in scanhex() which
parses user input.

isspace() from linux/ctype.h will accept vertical tab and form feed but
not NULL. The use of this macro is modified to accept NULL as
well. Additional characters are harmless since this macro is also only
used in scanhex().

Signed-off-by: Vincent Bernat <vincent@bernat.im>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
10 years agopowerpc/pseries: relocate "config DTL" so kconfig nests properly
Cody P Schafer [Tue, 13 May 2014 03:09:55 +0000 (20:09 -0700)]
powerpc/pseries: relocate "config DTL" so kconfig nests properly

Moving config DTL up so it is below config PPC_SPLPAR means that
menuconfig will show config DTL nicely indented right below config
PPC_SPLPAR when PPC_SPLPAR is enabled.

To contrast that, right now if I enable PPC_SPLPAR in menuconfig, all I
can immediately tell is that "something showed up further down the list
where I wasn't looking", and I end up having to toggle the option a few
times to figure out what showed up, or look at the KConfig to find out
that config DTL depends on config PPC_SPLPAR.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>