openwrt/staging/blogic.git
10 years agoIBM Currituck: Clean up board specific code before adding Akebono code
Alistair Popple [Thu, 6 Mar 2014 03:52:26 +0000 (14:52 +1100)]
IBM Currituck: Clean up board specific code before adding Akebono code

The IBM Akebono code uses the same initialisation functions as the
earlier Currituck board. Rather than create a copy of this code for
Akebono we will instead integrate support for it into the same file as
the Currituck code.

This patch just renames the board support file and updates the Makefile.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/le: Show the endianess of the LPAR under PowerVM.
Tony Breeds [Wed, 12 Mar 2014 08:17:07 +0000 (19:17 +1100)]
powerpc/le: Show the endianess of the LPAR under PowerVM.

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: Use 64k io pages when we never see an HEA
Alexander Graf [Tue, 1 Apr 2014 13:46:05 +0000 (15:46 +0200)]
powerpc: Use 64k io pages when we never see an HEA

When we never get around to seeing an HEA ethernet adapter, there's
no point in restricting ourselves to 4k IO page size.

This speeds up IO maps when CONFIG_IBMEBUS is disabled.

[ Updated the test to also lift the restriction on arch 2.07
  (Power 8) which cannot have an HEA
 -- BenH ]

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
foo

10 years agopowerpc: memcpy optimization for 64bit LE
Philippe Bergheaud [Tue, 29 Apr 2014 23:12:01 +0000 (09:12 +1000)]
powerpc: memcpy optimization for 64bit LE

Unaligned stores take alignment exceptions on POWER7 running in little-endian.
This is a dumb little-endian base memcpy that prevents unaligned stores.
Once booted the feature fixup code switches over to the VMX copy loops
(which are already endian safe).

The question is what we do before that switch over. The base 64bit
memcpy takes alignment exceptions on POWER7 so we can't use it as is.
Fixing the causes of alignment exception would slow it down, because
we'd need to ensure all loads and stores are aligned either through
rotate tricks or bytewise loads and stores. Either would be bad for
all other 64bit platforms.

[ I simplified the loop a bit - Anton ]

Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agoMerge commit 'f3cae355a962784101478504ef7f6a389ad62979' into next
Benjamin Herrenschmidt [Tue, 29 Apr 2014 23:36:34 +0000 (09:36 +1000)]
Merge commit 'f3cae355a962784101478504ef7f6a389ad62979' into next

Merge Linus tree to get "cpufreq, powernv: Fix build failure on UP"
to avoid build breakages in some of my test configs.

10 years agopowerpc/tm: Add checking to treclaim/trechkpt
Michael Neuling [Fri, 28 Mar 2014 05:40:34 +0000 (16:40 +1100)]
powerpc/tm: Add checking to treclaim/trechkpt

If we do a treclaim and we are not in TM suspend mode, it results in a TM bad
thing (ie. a 0x700 program check).  Similarly if we do a trechkpt and we have
an active transaction or TEXASR Failure Summary (FS) is not set, we also take a
TM bad thing.

This should never happen, but if it does (ie. a kernel bug), the cause is
almost impossible to debug as the GPR state is mostly userspace and hence we
don't get a call chain.

This adds some checks in these cases case a BUG_ON() (in asm) in case we ever
hit these cases.  It moves the register saving around to preserve r1 till later
also.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/tm: Remove unnecessary r1 save
Michael Neuling [Fri, 28 Mar 2014 05:40:33 +0000 (16:40 +1100)]
powerpc/tm: Remove unnecessary r1 save

We save r1 to the scratch SPR and restore it from there after the trechkpt so
saving r1 to the paca is not needed.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: powernv: Implement ppc_md.get_proc_freq()
Gautham R. Shenoy [Tue, 11 Mar 2014 11:31:19 +0000 (17:01 +0530)]
powerpc: powernv: Implement ppc_md.get_proc_freq()

Implement a method named pnv_get_proc_freq(unsigned int cpu) which
returns the current clock rate on the 'cpu' in Hz to be reported in
/proc/cpuinfo. This method uses the value reported by cpufreq when
such a value is sane. Otherwise it falls back to old way of reporting
the clockrate, i.e. ppc_proc_freq.

Set the ppc_md.get_proc_freq() hook to pnv_get_proc_freq() on the
PowerNV platform.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: powernv: Framework to show the correct clock in /proc/cpuinfo
Gautham R. Shenoy [Tue, 11 Mar 2014 11:31:18 +0000 (17:01 +0530)]
powerpc: powernv: Framework to show the correct clock in /proc/cpuinfo

Currently, the code in setup-common.c for powerpc assumes that all
clock rates are same in a smp system. This value is cached in the
variable named ppc_proc_freq and is the value that is reported in
/proc/cpuinfo.

However on the PowerNV platform, the clock rate is same only across
the threads of the same core. Hence the value that is reported in
/proc/cpuinfo is incorrect on PowerNV platforms. We need a better way
to query and report the correct value of the processor clock in
/proc/cpuinfo.

The patch achieves this by creating a machdep_call named
get_proc_freq() which is expected to returns the frequency in Hz. The
code in show_cpuinfo() can invoke this method to display the correct
clock rate on platforms that have implemented this method. On the
other powerpc platforms it can use the value cached in ppc_proc_freq.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Return secondary CPUs to firmware before FW update
Vasant Hegde [Wed, 9 Apr 2014 17:18:55 +0000 (22:48 +0530)]
powerpc/powernv: Return secondary CPUs to firmware before FW update

Firmware update on PowerNV platform takes several minutes. During
this time one CPU is stuck in FW and the kernel complains about "soft
lockups".

This patch returns all secondary CPUs to firmware before starting
firmware update process.

[ Reworked a bit and cleaned up -- BenH ]

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/pci: Use of_pci_range_parser helper in pci_process_bridge_OF_ranges
Andrew Murray [Tue, 25 Feb 2014 06:32:11 +0000 (06:32 +0000)]
powerpc/pci: Use of_pci_range_parser helper in pci_process_bridge_OF_ranges

This patch updates the implementation of pci_process_bridge_OF_ranges to use
the of_pci_range_parser helpers.

Signed-off-by: Andrew Murray <amurray@embedded-bits.co.uk>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/legacy_serial: Support MVME5100 UARTS with shifted registers
Stephen Chivers [Sat, 19 Apr 2014 23:43:10 +0000 (09:43 +1000)]
powerpc/legacy_serial: Support MVME5100 UARTS with shifted registers

This patch adds support to legacy serial for
UARTS with shifted registers.

The MVME5100 Single Board Computer is a PowerPC platform
that has 16550 style UARTS with register addresses that are
16 bytes apart (shifted by 4).

Commit  309257484cc1a592e8ac5fbdd8cd661be2b80bf8
"powerpc: Cleanup udbg_16550 and add support for LPC PIO-only UARTs"
added support to udbg_16550 for shifted registers by adding a "stride"
parameter to the initialisation operations for Programmed IO and
Memory Mapped IO.

As a consequence it is now possible to use the services of legacy serial
to provide early serial console messages for the MVME5100.

An added benefit of this is that the serial console will always be
"ttyS0" irrespective of whether the computer is fitted with extra
PCI 8250 interface boards or not.

I have tested this patch using the four PowerPC platforms available to me:

MVME5100 - shifted registers,
SAM440EP - unshifted registers,
MPC8349 - unshifted registers,
MVME4100 - unshifted registers.

Signed-off-by: Stephen Chivers <schivers@csc.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Add support for 64bit little endian wrapper
Cédric Le Goater [Thu, 24 Apr 2014 07:23:39 +0000 (09:23 +0200)]
powerpc/boot: Add support for 64bit little endian wrapper

The code is only slightly modified : entry points now use the
FIXUP_ENDIAN trampoline to switch endian order. The 32bit wrapper
is kept for big endian kernels and 64bit is enforced for little
endian kernels with a PPC64_BOOT_WRAPPER config option.

The linker script is generated using the kernel preprocessor flags
to make use of the CONFIG_* definitions and the wrapper script is
modified to take into account the new elf64ppc format.

Finally, the zImage file is compiled as a position independent
executable (-pie) which makes it loadable at any address by the
firmware.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Add a global entry point for pseries
Cédric Le Goater [Thu, 24 Apr 2014 07:23:38 +0000 (09:23 +0200)]
powerpc/boot: Add a global entry point for pseries

When entering the boot wrapper in little endian, we will need to fix
the endian order using a fixup trampoline like in the kernel. This
patch overrides the _zimage_start entry point for this purpose.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Modify entry point for 64bit
Cédric Le Goater [Thu, 24 Apr 2014 07:23:37 +0000 (09:23 +0200)]
powerpc/boot: Modify entry point for 64bit

This patch adds support a 64bit wrapper entry point. As in 32bit, the
entry point does its own relocation and can be loaded at any address
by the firmware.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Define a routine to enter prom
Cédric Le Goater [Thu, 24 Apr 2014 07:23:36 +0000 (09:23 +0200)]
powerpc/boot: Define a routine to enter prom

This patch defines a 'prom' routine similar to 'enter_prom' in the
kernel.

The difference is in the MSR which is built before entering prom. Big
endian order is enforced as in the kernel but 32bit mode is not. It
prepares ground for the next patches which will introduce Little endian
order.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Add little endian support to elf utils
Cédric Le Goater [Thu, 24 Apr 2014 07:23:35 +0000 (09:23 +0200)]
powerpc/boot: Add little endian support to elf utils

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Add 64bit and little endian support to addnote
Cédric Le Goater [Thu, 24 Apr 2014 07:23:34 +0000 (09:23 +0200)]
powerpc/boot: Add 64bit and little endian support to addnote

It could certainly be improved using Elf macros and byteswapping
routines, but the initial version of the code is organised to be a
single file program with limited dependencies. yaboot is the same.

Please scream if you want a total rewrite.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Define byteswapping routines for little endian
Cédric Le Goater [Thu, 24 Apr 2014 07:23:33 +0000 (09:23 +0200)]
powerpc/boot: Define byteswapping routines for little endian

These are not the most efficient versions of swab but the wrapper does
not do much byte swapping. On a big endian cpu, these routines are
a no-op.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Fix compile warning in 64bit
Cédric Le Goater [Thu, 24 Apr 2014 07:23:32 +0000 (09:23 +0200)]
powerpc/boot: Fix compile warning in 64bit

arch/powerpc/boot/oflib.c:211:9: warning: cast to pointer from integer of \
  different size [-Wint-to-pointer-cast]
  return (phandle) of_call_prom("finddevice", 1, 1, name);

This is a work around. The definite solution would be to define the
phandle typedef as a u32, as in the kernel, but this would break the
device tree ops API.

Let it be for the moment.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Define typedef ihandle as u32
Cédric Le Goater [Thu, 24 Apr 2014 07:23:31 +0000 (09:23 +0200)]
powerpc/boot: Define typedef ihandle as u32

This makes ihandle 64bit friendly.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Rework of_claim() to make it 64bit friendly
Cédric Le Goater [Thu, 24 Apr 2014 07:23:30 +0000 (09:23 +0200)]
powerpc/boot: Rework of_claim() to make it 64bit friendly

This patch fixes 64bit compile warnings and updates the wrapper code
to converge the kernel code in prom_init.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Add PROM_ERROR define in oflib
Cédric Le Goater [Thu, 24 Apr 2014 07:23:29 +0000 (09:23 +0200)]
powerpc/boot: Add PROM_ERROR define in oflib

This is mostly useful to make to the boot wrapper code closer with
the kernel code in prom_init.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Add byteswapping routines in oflib
Cédric Le Goater [Thu, 24 Apr 2014 07:23:28 +0000 (09:23 +0200)]
powerpc/boot: Add byteswapping routines in oflib

Values will need to be byte-swapped when calling prom (big endian) from
a little endian boot wrapper.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Use prom_arg_t in oflib
Cédric Le Goater [Thu, 24 Apr 2014 07:23:27 +0000 (09:23 +0200)]
powerpc/boot: Use prom_arg_t in oflib

This patch updates the wrapper code to converge with the kernel code in
prom_init.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Use a common prom_args struct in oflib
Cédric Le Goater [Thu, 24 Apr 2014 07:23:26 +0000 (09:23 +0200)]
powerpc/boot: Use a common prom_args struct in oflib

This patch fixes warnings when the wrapper is compiled in 64bit and
updates the boot wrapper code related to prom to converge with the
kernel code in prom_init. This should make the review of changes easier.

The kernel has a different number of possible arguments (10) when
entering prom. There does not seem to be any good reason to have
12 in the wrapper, so the patch changes this value to args[10] in
the prom_args struct.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/boot: Fix do_div for 64bit wrapper
Cédric Le Goater [Thu, 24 Apr 2014 07:23:25 +0000 (09:23 +0200)]
powerpc/boot: Fix do_div for 64bit wrapper

When the boot wrapper is compiled in 64bit, there is no need to
use __div64_32.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/prom: Stop scanning dev-tree for fdump early
Gavin Shan [Thu, 24 Apr 2014 08:00:31 +0000 (18:00 +1000)]
powerpc/prom: Stop scanning dev-tree for fdump early

Function early_init_dt_scan_fw_dump() is called to scan the device
tree for fdump properties under node "rtas". Any one of them is
invalid, we can stop scanning the device tree early by returning
"1". It would save a bit time during boot.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Don't use pe->pbus to get the domain number
Gavin Shan [Thu, 24 Apr 2014 08:00:29 +0000 (18:00 +1000)]
powerpc/powernv: Don't use pe->pbus to get the domain number

If the PE contains single PCI function, "pe->pbus" would be NULL.
It's not reliable to be used by pci_domain_nr().  We just grab the
PCI domain number from the PCI host controller (struct pci_controller)
instance.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Missed IOMMU table type
Gavin Shan [Thu, 24 Apr 2014 08:00:28 +0000 (18:00 +1000)]
powerpc/powernv: Missed IOMMU table type

In function pnv_pci_ioda2_setup_dma_pe(), the IOMMU table type is
set to (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE) unconditionally.
It was just set to TCE_PCI by pnv_pci_setup_iommu_table(). So the
primary IOMMU table type (TCE_PCI) is lost. The patch fixes it.

Also, pnv_pci_setup_iommu_table() already set "tbl->it_busno" to
zero and we needn't do it again. The patch removes the redundant
assignment.

The patch also fixes similar issues in pnv_pci_ioda_setup_dma_pe().

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fundamental reset on PLX ports
Gavin Shan [Thu, 24 Apr 2014 08:00:27 +0000 (18:00 +1000)]
powerpc/powernv: Fundamental reset on PLX ports

The patch intends to support fundamental reset on PLX downstream
ports. If the PCI device matches any one of the internal table,
which includes PLX vendor ID, bridge device ID, register offset
for fundamental reset and bit, fundamental reset will be done
accordingly. Otherwise, it will fail back to hot reset.

Additional flag (EEH_DEV_FRESET) is introduced to record the last
reset type on the PCI bridge.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Can't recover from non-PE-reset case
Gavin Shan [Thu, 24 Apr 2014 08:00:26 +0000 (18:00 +1000)]
powerpc/eeh: Can't recover from non-PE-reset case

When PCI_ERS_RESULT_CAN_RECOVER returned from device drivers, the
EEH core should enable I/O and DMA for the affected PE. However,
it was missed to have DMA enabled in eeh_handle_normal_event().
Besides, the frozen state of the affected PE should be cleared
after successful recovery, but we didn't.

The patch fixes both of the issues as above.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowrpc/powernv: Reset PHB in kdump kernel
Gavin Shan [Thu, 24 Apr 2014 08:00:25 +0000 (18:00 +1000)]
powrpc/powernv: Reset PHB in kdump kernel

In the kdump scenario, the first kerenl doesn't shutdown PCI devices
and the kdump kerenl clean PHB IODA table at the early probe time.
That means the kdump kerenl can't support PCI transactions piled
by the first kerenl. Otherwise, lots of EEH errors and frozen PEs
will be detected.

In order to avoid the EEH errors, the PHB is resetted to drop all
PCI transaction from the first kerenl.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/pci: Mask linkDown on resetting PCI bus
Gavin Shan [Thu, 24 Apr 2014 08:00:24 +0000 (18:00 +1000)]
powerpc/pci: Mask linkDown on resetting PCI bus

The problem was initially reported by Wendy who tried pass through
IPR adapter, which was connected to PHB root port directly, to KVM
based guest. When doing that, pci_reset_bridge_secondary_bus() was
called by VFIO driver and linkDown was detected by the root port.
That caused all PEs to be frozen.

The patch fixes the issue by routing the reset for the secondary bus
of root port to underly firmware. For that, one more weak function
pci_reset_secondary_bus() is introduced so that the individual platforms
can override that and do specific reset for bridge's secondary bus.

Reported-by: Wendy Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Make the delay for PE reset unified
Gavin Shan [Thu, 24 Apr 2014 08:00:23 +0000 (18:00 +1000)]
powerpc/eeh: Make the delay for PE reset unified

Basically, we have 3 types of resets to fulfil PE reset: fundamental,
hot and PHB reset. For the later 2 cases, we need PCI bus reset hold
and settlement delay as specified by PCI spec. PowerNV and pSeries
platforms are running on top of different firmware and some of the
delays have been covered by underly firmware (PowerNV).

The patch makes the delays unified to be done in backend, instead of
EEH core.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Reset root port in firmware
Gavin Shan [Thu, 24 Apr 2014 08:00:22 +0000 (18:00 +1000)]
powerpc/powernv: Reset root port in firmware

Resetting root port has more stuff to do than that for PCIe switch
ports and we should have resetting root port done in firmware instead
of the kernel itself. The problem was introduced by commit 5b2e198e
("powerpc/powernv: Rework EEH reset").

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/pseries: Fix overwritten PE state
Gavin Shan [Thu, 24 Apr 2014 08:00:21 +0000 (18:00 +1000)]
powerpc/pseries: Fix overwritten PE state

In pseries_eeh_get_state(), EEH_STATE_UNAVAILABLE is always
overwritten by EEH_STATE_NOT_SUPPORT because of the missed
"break" there. The patch fixes the issue.

Reported-by: Joe Perches <joe@perches.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fix endless reporting frozen PE
Gavin Shan [Thu, 24 Apr 2014 08:00:20 +0000 (18:00 +1000)]
powerpc/powernv: Fix endless reporting frozen PE

Once one specific PE has been marked as EEH_PE_ISOLATED, it's in
the middile of recovery or removed permenently. We needn't report
the frozen PE again. Otherwise, we will have endless reporting
same frozen PE.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: No hotplug on permanently removed dev
Gavin Shan [Thu, 24 Apr 2014 08:00:19 +0000 (18:00 +1000)]
powerpc/eeh: No hotplug on permanently removed dev

The issue was detected in a bit complicated test case where
we have multiple hierarchical PEs shown as following figure:

                +-----------------+
                | PE#3     p2p#0  |
                |          p2p#1  |
                +-----------------+
                        |
                +-----------------+
                | PE#4     pdev#0 |
                |          pdev#1 |
                +-----------------+

PE#4 (have 2 PCI devices) is the child of PE#3, which has 2 p2p
bridges. We accidentally had less-known scenario: PE#4 was removed
permanently from the system because of permanent failure (e.g.
exceeding the max allowd failure times in last hour), then we detects
EEH errors on PE#3 and tried to recover it. However, eeh_dev instances
for pdev#0/1 were not detached from PE#4, which was still connected to
PE#3. All of that was because of the fact that we rely on count-based
pcibios_release_device(), which isn't reliable enough. When doing
recovery for PE#3, we still apply hotplug on PE#4 and pdev#0/1, which
are not valid any more. Eventually, we run into kernel crash.

The patch fixes above issue from two aspects. For unplug, we simply
skip those permanently removed PE, whose state is (EEH_PE_STATE_ISOLATED
&& !EEH_PE_STATE_RECOVERING) and its frozen count should be greater
than EEH_MAX_ALLOWED_FREEZES. For plug, we marked all permanently
removed EEH devices with EEH_DEV_REMOVED and return 0xFF's on read
its PCI config so that PCI core will omit them.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Allow to disable EEH
Gavin Shan [Thu, 24 Apr 2014 08:00:18 +0000 (18:00 +1000)]
powerpc/eeh: Allow to disable EEH

The patch introduces bootarg "eeh=off" to disable EEH functinality.
Also, it creates /sys/kerenl/debug/powerpc/eeh_enable to disable
or enable EEH functionality. By default, we have the functionality
enabled.

For PowerNV platform, we will restore to have the conventional
mechanism of clearing frozen PE during PCI config access if we're
going to disable EEH functionality. Conversely, we will rely on
EEH for error recovery.

The patch also fixes the issue that we missed to cover the case
of disabled EEH functionality in function ioda_eeh_event(). Those
events driven by interrupt should be cleared to avoid endless
reporting.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Cleanup EEH subsystem variables
Gavin Shan [Thu, 24 Apr 2014 08:00:17 +0000 (18:00 +1000)]
powerpc/eeh: Cleanup EEH subsystem variables

There're 2 EEH subsystem variables: eeh_subsystem_enabled and
eeh_probe_mode. We needn't maintain 2 variables and we can just
have one variable and introduce different flags. The patch also
introduces additional flag EEH_FORCE_DISABLE, which will be used
to disable EEH subsystem via boot parameter ("eeh=off") in future.
Besides, the patch also introduces flag EEH_ENABLED, which is
changed to disable or enable EEH functionality on the fly through
debugfs entry in future.

With the patch applied, the creteria to check the enabled EEH
functionality is changed to:

!EEH_FORCE_DISABLED && EEH_ENABLED : Enabled
                       Other cases : Disabled

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Use cached capability for log dump
Gavin Shan [Thu, 24 Apr 2014 08:00:16 +0000 (18:00 +1000)]
powerpc/eeh: Use cached capability for log dump

When calling into eeh_gather_pci_data() on pSeries platform, we
possiblly don't have pci_dev instance yet, but eeh_dev is always
ready. So we use cached capability from eeh_dev instead of pci_dev
for log dump there. In order to keep things unified, we also cache
PCI capability positions to eeh_dev for PowerNV as well.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Cleanup eeh_gather_pci_data()
Gavin Shan [Thu, 24 Apr 2014 08:00:15 +0000 (18:00 +1000)]
powerpc/eeh: Cleanup eeh_gather_pci_data()

The patch replaces printk(KERN_WARNING ...) with pr_warn() in the
function eeh_gather_pci_data().

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Avoid I/O access during PE reset
Gavin Shan [Thu, 24 Apr 2014 08:00:14 +0000 (18:00 +1000)]
powerpc/eeh: Avoid I/O access during PE reset

We have suffered recrusive frozen PE a lot, which was caused
by IO accesses during the PE reset. Ben came up with the good
idea to keep frozen PE until recovery (BAR restore) gets done.
With that, IO accesses during PE reset are dropped by hardware
and wouldn't incur the recrusive frozen PE any more.

The patch implements the idea. We don't clear the frozen state
until PE reset is done completely. During the period, the EEH
core expects unfrozen state from backend to keep going. So we
have to reuse EEH_PE_RESET flag, which has been set during PE
reset, to return normal state from backend. The side effect is
we have to clear frozen state for towice (PE reset and clear it
explicitly), but that's harmless.

We have some limitations on pHyp. pHyp doesn't allow to enable
IO or DMA for unfrozen PE. So we don't enable them on unfrozen PE
in eeh_pci_enable(). We have to enable IO before grabbing logs on
pHyp. Otherwise, 0xFF's is always returned from PCI config space.
Also, we had wrong return value from eeh_pci_enable() for
EEH_OPT_THAW_DMA case. The patch fixes it too.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Use EEH PCI config accessors
Gavin Shan [Thu, 24 Apr 2014 08:00:13 +0000 (18:00 +1000)]
powerpc/powernv: Use EEH PCI config accessors

For EEH PowerNV backends, they need use their own PCI config
accesors as the normal one could be blocked during PE reset.
The patch also removes necessary parameter "hose" for the
function ioda_eeh_bridge_reset().

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Block PCI-CFG access during PE reset
Gavin Shan [Thu, 24 Apr 2014 08:00:12 +0000 (18:00 +1000)]
powerpc/eeh: Block PCI-CFG access during PE reset

We've observed multiple PE reset failures because of PCI-CFG
access during that period. Potentially, some device drivers
can't support EEH very well and they can't put the device to
motionless state before PE reset. So those device drivers might
produce PCI-CFG accesses during PE reset. Also, we could have
PCI-CFG access from user space (e.g. "lspci"). Since access to
frozen PE should return 0xFF's, we can block PCI-CFG access
during the period of PE reset so that we won't get recrusive EEH
errors.

The patch adds flag EEH_PE_RESET, which is kept during PE reset.
The PowerNV/pSeries PCI-CFG accessors reuse the flag to block
PCI-CFG accordingly.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: EEH_PE_ISOLATED not reflect HW state
Gavin Shan [Thu, 24 Apr 2014 08:00:11 +0000 (18:00 +1000)]
powerpc/eeh: EEH_PE_ISOLATED not reflect HW state

When doing PE reset, EEH_PE_ISOLATED is cleared unconditionally.
However, We should remove that if the PE reset has cleared the
frozen state successfully. Otherwise, the flag should be kept.
The patch fixes the issue.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Remove fields in PHB diag-data dump
Gavin Shan [Thu, 24 Apr 2014 08:00:10 +0000 (18:00 +1000)]
powerpc/powernv: Remove fields in PHB diag-data dump

For some fields (e.g. LEM, MMIO, DMA) in PHB diag-data dump, it's
meaningless to print them if they have non-zero value in the
corresponding mask registers because we always have non-zero values
in the mask registers. The patch only prints those fieds if we
have non-zero values in the primary registers (e.g. LEM, MMIO, DMA
status) so that we can save couple of lines. The patch also removes
unnecessary spare line before "brdgCtl:" and two leading spaces as
prefix in each line as Ben suggested.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Move PNV_EEH_STATE_ENABLED around
Gavin Shan [Thu, 24 Apr 2014 08:00:09 +0000 (18:00 +1000)]
powerpc/powernv: Move PNV_EEH_STATE_ENABLED around

The flag PNV_EEH_STATE_ENABLED is put into pnv_phb::eeh_state,
which is protected by CONFIG_EEH. We needn't that. Instead, we
can have pnv_phb::flags and maintain all flags there, which is
the purpose of the patch. The patch also renames PNV_EEH_STATE_ENABLED
to PNV_PHB_FLAG_EEH.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Remove PNV_EEH_STATE_REMOVED
Gavin Shan [Thu, 24 Apr 2014 08:00:08 +0000 (18:00 +1000)]
powerpc/powernv: Remove PNV_EEH_STATE_REMOVED

The PHB state PNV_EEH_STATE_REMOVED maintained in pnv_phb isn't
so useful any more and it's duplicated to EEH_PE_ISOLATED. The
patch replaces PNV_EEH_STATE_REMOVED with EEH_PE_ISOLATED.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/eeh: Remove EEH_PE_PHB_DEAD
Gavin Shan [Thu, 24 Apr 2014 08:00:07 +0000 (18:00 +1000)]
powerpc/eeh: Remove EEH_PE_PHB_DEAD

The PE state (for eeh_pe instance) EEH_PE_PHB_DEAD is duplicate to
EEH_PE_ISOLATED. Originally, those PHBs (PHB PE) with EEH_PE_PHB_DEAD
would be removed from the system. However, it's safe to replace
that with EEH_PE_ISOLATED.

The patch also clear EEH_PE_RECOVERING after fenced PHB has been handled,
either failure or success. It makes the PHB PE state consistent with:

PHB functions normally   NONE
PHB has been removed   EEH_PE_ISOLATED
PHB fenced, recovery in progress  EEH_PE_ISOLATED | RECOVERING

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/4xx: Fix section mismatch in ppc4xx_pci.c
Alistair Popple [Tue, 8 Apr 2014 04:20:19 +0000 (14:20 +1000)]
powerpc/4xx: Fix section mismatch in ppc4xx_pci.c

This patch fixes this section mismatch:

WARNING: vmlinux.o(.text+0x1efc4): Section mismatch in reference from
the function apm821xx_pciex_init_port_hw() to the function
.init.text:ppc4xx_pciex_wait_on_sdr.isra.9()

The function apm821xx_pciex_init_port_hw() references the function
__init ppc4xx_pciex_wait_on_sdr.isra.9().  This is often because
apm821xx_pciex_init_port_hw lacks a __init annotation or the
annotation of ppc4xx_pciex_wait_on_sdr.isra.9 is wrong.

apm821xx_pciex_init_port_hw is only referenced by a struct in
__initdata, so it should be safe to add __init to
apm821xx_pciex_init_port_hw.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agoppc/kvm: Clear the runlatch bit of a vcpu before napping
Preeti U Murthy [Fri, 11 Apr 2014 10:32:08 +0000 (16:02 +0530)]
ppc/kvm: Clear the runlatch bit of a vcpu before napping

When the guest cedes the vcpu or the vcpu has no guest to
run it naps. Clear the runlatch bit of the vcpu before
napping to indicate an idle cpu.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agoppc/kvm: Set the runlatch bit of a CPU just before starting guest
Preeti U Murthy [Fri, 11 Apr 2014 10:31:58 +0000 (16:01 +0530)]
ppc/kvm: Set the runlatch bit of a CPU just before starting guest

The secondary threads in the core are kept offline before launching guests
in kvm on powerpc: "371fefd6f2dc4666:KVM: PPC: Allow book3s_hv guests to use
SMT processor modes."

Hence their runlatch bits are cleared. When the secondary threads are called
in to start a guest, their runlatch bits need to be set to indicate that they
are busy. The primary thread has its runlatch bit set though, but there is no
harm in setting this bit once again. Hence set the runlatch bit for all
threads before they start guest.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agoppc/powernv: Set the runlatch bits correctly for offline cpus
Preeti U Murthy [Fri, 11 Apr 2014 10:31:48 +0000 (16:01 +0530)]
ppc/powernv: Set the runlatch bits correctly for offline cpus

Up until now we have been setting the runlatch bits for a busy CPU and
clearing it when a CPU enters idle state. The runlatch bit has thus
been consistent with the utilization of a CPU as long as the CPU is online.

However when a CPU is hotplugged out the runlatch bit is not cleared. It
needs to be cleared to indicate an unused CPU. Hence this patch has the
runlatch bit cleared for an offline CPU just before entering an idle state
and sets it immediately after it exits the idle state.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/pseries: Protect remove_memory() with device hotplug lock
Li Zhong [Thu, 10 Apr 2014 08:25:31 +0000 (16:25 +0800)]
powerpc/pseries: Protect remove_memory() with device hotplug lock

While testing memory hot-remove, I found following dead lock:

Process #1141 is drmgr, trying to remove some memory, i.e. memory499.
It holds the memory_hotplug_mutex, and blocks when trying to remove file
"online" under dir memory499, in kernfs_drain(), at
        wait_event(root->deactivate_waitq,
                   atomic_read(&kn->active) == KN_DEACTIVATED_BIAS);

Process #1120 is trying to online memory499 by
   echo 1 > memory499/online

In .kernfs_fop_write, it uses kernfs_get_active() to increase
&kn->active, thus blocking process #1141. While itself is blocked later
when trying to acquire memory_hotplug_mutex, which is held by process

The backtrace of both processes are shown below:

[<c000000001b18600>] 0xc000000001b18600
[<c000000000015044>] .__switch_to+0x144/0x200
[<c000000000263ca4>] .online_pages+0x74/0x7b0
[<c00000000055b40c>] .memory_subsys_online+0x9c/0x150
[<c00000000053cbe8>] .device_online+0xb8/0x120
[<c00000000053cd04>] .online_store+0xb4/0xc0
[<c000000000538ce4>] .dev_attr_store+0x64/0xa0
[<c00000000030f4ec>] .sysfs_kf_write+0x7c/0xb0
[<c00000000030e574>] .kernfs_fop_write+0x154/0x1e0
[<c000000000268450>] .vfs_write+0xe0/0x260
[<c000000000269144>] .SyS_write+0x64/0x110
[<c000000000009ffc>] syscall_exit+0x0/0x7c

[<c000000001b18600>] 0xc000000001b18600
[<c000000000015044>] .__switch_to+0x144/0x200
[<c00000000030be14>] .__kernfs_remove+0x204/0x300
[<c00000000030d428>] .kernfs_remove_by_name_ns+0x68/0xf0
[<c00000000030fb38>] .sysfs_remove_file_ns+0x38/0x60
[<c000000000539354>] .device_remove_attrs+0x54/0xc0
[<c000000000539fd8>] .device_del+0x158/0x250
[<c00000000053a104>] .device_unregister+0x34/0xa0
[<c00000000055bc14>] .unregister_memory_section+0x164/0x170
[<c00000000024ee18>] .__remove_pages+0x108/0x4c0
[<c00000000004b590>] .arch_remove_memory+0x60/0xc0
[<c00000000026446c>] .remove_memory+0x8c/0xe0
[<c00000000007f9f4>] .pseries_remove_memblock+0xd4/0x160
[<c00000000007fcfc>] .pseries_memory_notifier+0x27c/0x290
[<c0000000008ae6cc>] .notifier_call_chain+0x8c/0x100
[<c0000000000d858c>] .__blocking_notifier_call_chain+0x6c/0xe0
[<c00000000071ddec>] .of_property_notify+0x7c/0xc0
[<c00000000071ed3c>] .of_update_property+0x3c/0x1b0
[<c0000000000756cc>] .ofdt_write+0x3dc/0x740
[<c0000000002f60fc>] .proc_reg_write+0xac/0x110
[<c000000000268450>] .vfs_write+0xe0/0x260
[<c000000000269144>] .SyS_write+0x64/0x110
[<c000000000009ffc>] syscall_exit+0x0/0x7c

This patch uses lock_device_hotplug() to protect remove_memory() called
in pseries_remove_memblock(), which is also stated before function
remove_memory():

 * NOTE: The caller must call lock_device_hotplug() to serialize hotplug
 * and online/offline operations before this call, as required by
 * try_offline_node().
 */
void __ref remove_memory(int nid, u64 start, u64 size)

With this lock held, the other process(#1120 above) trying to online the
memory block will retry the system call when calling
lock_device_hotplug_sysfs(), and finally find No such device error.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: Fix error return in rtas_flash module init
Anton Blanchard [Mon, 14 Apr 2014 11:23:32 +0000 (21:23 +1000)]
powerpc: Fix error return in rtas_flash module init

module_init should return 0 or a negative errno.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: Bump BOOT_COMMAND_LINE_SIZE to 2048
Anton Blanchard [Mon, 14 Apr 2014 11:55:25 +0000 (21:55 +1000)]
powerpc: Bump BOOT_COMMAND_LINE_SIZE to 2048

Bump the boot wrapper BOOT_COMMAND_LINE_SIZE to match the
kernel.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: Bump COMMAND_LINE_SIZE to 2048
Anton Blanchard [Mon, 14 Apr 2014 11:54:52 +0000 (21:54 +1000)]
powerpc: Bump COMMAND_LINE_SIZE to 2048

I've had a report that the current limit is too small for
an automated network based installer. Bump it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: Rename duplicate COMMAND_LINE_SIZE define
Anton Blanchard [Mon, 14 Apr 2014 11:54:05 +0000 (21:54 +1000)]
powerpc: Rename duplicate COMMAND_LINE_SIZE define

We have two definitions of COMMAND_LINE_SIZE, one for the kernel
and one for the boot wrapper. I assume this is so the boot
wrapper can be self sufficient and not rely on kernel headers.

Having two defines with the same name is confusing, I just
updated the wrong one when trying to bump it.

Make the boot wrapper define unique by calling it
BOOT_COMMAND_LINE_SIZE.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/perf/hv-24x7: Catalog version number is be64, not be32
Cody P Schafer [Tue, 15 Apr 2014 17:10:55 +0000 (10:10 -0700)]
powerpc/perf/hv-24x7: Catalog version number is be64, not be32

The catalog version number was changed from a be32 (with proceeding
32bits of padding) to a be64, update the code to treat it as a be64

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/perf/hv-24x7: Remove [static 4096], sparse chokes on it
Cody P Schafer [Tue, 15 Apr 2014 17:10:54 +0000 (10:10 -0700)]
powerpc/perf/hv-24x7: Remove [static 4096], sparse chokes on it

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/perf/hv-24x7: Use (unsigned long) not (u32) values when calling plpar_hcall_n...
Cody P Schafer [Tue, 15 Apr 2014 17:10:53 +0000 (10:10 -0700)]
powerpc/perf/hv-24x7: Use (unsigned long) not (u32) values when calling plpar_hcall_norets()

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/perf/hv-gpci: Make device attr static
Cody P Schafer [Tue, 15 Apr 2014 17:10:52 +0000 (10:10 -0700)]
powerpc/perf/hv-gpci: Make device attr static

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/perf/hv_gpci: Probe failures use pr_debug(), and padding reduced
Cody P Schafer [Tue, 15 Apr 2014 17:10:51 +0000 (10:10 -0700)]
powerpc/perf/hv_gpci: Probe failures use pr_debug(), and padding reduced

fixup for "powerpc/perf: Add support for the hv gpci (get performance
counter info) interface".

Makes the "not enabled" message less awful (and hidden unless
debugging).

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/perf/hv_24x7: Probe errors changed to pr_debug(), padding fixed
Cody P Schafer [Tue, 15 Apr 2014 17:10:50 +0000 (10:10 -0700)]
powerpc/perf/hv_24x7: Probe errors changed to pr_debug(), padding fixed

fixup for "powerpc/perf: Add support for the hv 24x7 interface"

Makes the "not enabled" message less awful (and hides it in most cases).

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/mm: Fix tlbie to add AVAL fields for 64K pages
Aneesh Kumar K.V [Mon, 21 Apr 2014 05:07:36 +0000 (10:37 +0530)]
powerpc/mm: Fix tlbie to add AVAL fields for 64K pages

The if condition check was based on a draft ISA doc. Remove the same.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fix little endian issues in OPAL dump code
Anton Blanchard [Tue, 22 Apr 2014 05:01:27 +0000 (15:01 +1000)]
powerpc/powernv: Fix little endian issues in OPAL dump code

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Create OPAL sglist helper functions and fix endian issues
Anton Blanchard [Tue, 22 Apr 2014 05:01:26 +0000 (15:01 +1000)]
powerpc/powernv: Create OPAL sglist helper functions and fix endian issues

We have two copies of code that creates an OPAL sg list. Consolidate
these into a common set of helpers and fix the endian issues.

The flash interface embedded a version number in the num_entries
field, whereas the dump interface did did not. Since versioning
wasn't added to the flash interface and it is impossible to add
this in a backwards compatible way, just remove it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fix little endian issues in OPAL error log code
Anton Blanchard [Tue, 22 Apr 2014 05:01:25 +0000 (15:01 +1000)]
powerpc/powernv: Fix little endian issues in OPAL error log code

Fix little endian issues with the OPAL error log code.

Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fix little endian issues with opal_do_notifier calls
Anton Blanchard [Tue, 22 Apr 2014 05:01:24 +0000 (15:01 +1000)]
powerpc/powernv: Fix little endian issues with opal_do_notifier calls

The bitmap in opal_poll_events and opal_handle_interrupt is
big endian, so we need to byteswap it on little endian builds.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Remove some OPAL function declaration duplication
Anton Blanchard [Tue, 22 Apr 2014 05:01:23 +0000 (15:01 +1000)]
powerpc/powernv: Remove some OPAL function declaration duplication

We had some duplication of the internal OPAL functions.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Use uint64_t instead of size_t in OPAL APIs
Anton Blanchard [Tue, 22 Apr 2014 05:01:22 +0000 (15:01 +1000)]
powerpc/powernv: Use uint64_t instead of size_t in OPAL APIs

Using size_t in our APIs is asking for trouble, especially
when some OPAL calls use size_t pointers.

Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Release the refcount for pci_dev
Wei Yang [Wed, 23 Apr 2014 02:26:33 +0000 (10:26 +0800)]
powerpc/powernv: Release the refcount for pci_dev

On PowerNV platform, we are holding an unnecessary refcount on a pci_dev, which
leads to the pci_dev is not destroyed when hotplugging a pci device.

This patch release the unnecessary refcount.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Reduce multi-hit of iommu_add_device()
Wei Yang [Wed, 23 Apr 2014 02:26:32 +0000 (10:26 +0800)]
powerpc/powernv: Reduce multi-hit of iommu_add_device()

During the EEH hotplug event, iommu_add_device() will be invoked three times
and two of them will trigger warning or error.

The three times to invoke the iommu_add_device() are:

    pci_device_add
       ...
       set_iommu_table_base_and_group   <- 1st time, fail
    device_add
       ...
       tce_iommu_bus_notifier           <- 2nd time, succees
    pcibios_add_pci_devices
       ...
       pcibios_setup_bus_devices        <- 3rd time, re-attach

The first time fails, since the dev->kobj->sd is not initialized. The
dev->kobj->sd is initialized in device_add().
The third time's warning is triggered by the re-attach of the iommu_group.

After applying this patch, the error

    iommu_tce: 0003:05:00.0 has not been added, ret=-14

and the warning

    [  204.123609] ------------[ cut here ]------------
    [  204.123645] WARNING: at arch/powerpc/kernel/iommu.c:1125
    [  204.123680] Modules linked in: xt_CHECKSUM nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6t_REJECT bnep bluetooth 6lowpan_iphc rfkill xt_conntrack ebtable_nat ebtable_broute bridge stp llc mlx4_ib ib_sa ib_mad ib_core ib_addr ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnx2x tg3 mlx4_core nfsd ptp mdio ses libcrc32c nfs_acl enclosure be2net pps_core shpchp lockd kvm uinput sunrpc binfmt_misc lpfc scsi_transport_fc ipr scsi_tgt
    [  204.124356] CPU: 18 PID: 650 Comm: eehd Not tainted 3.14.0-rc5yw+ #102
    [  204.124400] task: c0000027ed485670 ti: c0000027ed50c000 task.ti: c0000027ed50c000
    [  204.124453] NIP: c00000000003cf80 LR: c00000000006c648 CTR: c00000000006c5c0
    [  204.124506] REGS: c0000027ed50f440 TRAP: 0700   Not tainted  (3.14.0-rc5yw+)
    [  204.124558] MSR: 9000000000029032 <SF,HV,EE,ME,IR,DR,RI>  CR: 88008084  XER: 20000000
    [  204.124682] CFAR: c00000000006c644 SOFTE: 1
    GPR00: c00000000006c648 c0000027ed50f6c0 c000000001398380 c0000027ec260300
    GPR04: c0000027ea92c000 c00000000006ad00 c0000000016e41b0 0000000000000110
    GPR08: c0000000012cd4c0 0000000000000001 c0000027ec2602ff 0000000000000062
    GPR12: 0000000028008084 c00000000fdca200 c0000000000d1d90 c0000027ec281a80
    GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000001
    GPR24: 000000005342697b 0000000000002906 c000001fe6ac9800 c000001fe6ac9800
    GPR28: 0000000000000000 c0000000016e3a80 c0000027ea92c090 c0000027ea92c000
    [  204.125353] NIP [c00000000003cf80] .iommu_add_device+0x30/0x1f0
    [  204.125399] LR [c00000000006c648] .pnv_pci_ioda_dma_dev_setup+0x88/0xb0
    [  204.125443] Call Trace:
    [  204.125464] [c0000027ed50f6c0] [c0000027ed50f750] 0xc0000027ed50f750 (unreliable)
    [  204.125526] [c0000027ed50f750] [c00000000006c648] .pnv_pci_ioda_dma_dev_setup+0x88/0xb0
    [  204.125588] [c0000027ed50f7d0] [c000000000069cc8] .pnv_pci_dma_dev_setup+0x78/0x340
    [  204.125650] [c0000027ed50f870] [c000000000044408] .pcibios_setup_device+0x88/0x2f0
    [  204.125712] [c0000027ed50f940] [c000000000046040] .pcibios_setup_bus_devices+0x60/0xd0
    [  204.125774] [c0000027ed50f9c0] [c000000000043acc] .pcibios_add_pci_devices+0xdc/0x1c0
    [  204.125837] [c0000027ed50fa50] [c00000000086f970] .eeh_reset_device+0x36c/0x4f0
    [  204.125939] [c0000027ed50fb20] [c00000000003a2d8] .eeh_handle_normal_event+0x448/0x480
    [  204.126068] [c0000027ed50fbc0] [c00000000003a35c] .eeh_handle_event+0x4c/0x340
    [  204.126192] [c0000027ed50fc80] [c00000000003a74c] .eeh_event_handler+0xfc/0x1b0
    [  204.126319] [c0000027ed50fd30] [c0000000000d1ea0] .kthread+0x110/0x130
    [  204.126430] [c0000027ed50fe30] [c00000000000a460] .ret_from_kernel_thread+0x5c/0x7c
    [  204.126556] Instruction dump:
    [  204.126610] 7c0802a6 fba1ffe8 fbc1fff0 fbe1fff8 f8010010 f821ff71 7c7e1b78 60000000
    [  204.126787] 60000000 e87e0298 3143ffff 7d2a1910 <0b0900002fa90000 40de00c8 ebfe0218
    [  204.126966] ---[ end trace 6e7aefd80add2973 ]---

are cleared.

This patch removes iommu_add_device() in pnv_pci_ioda_dma_dev_setup(), which
revert part of the change in commit d905c5df(PPC: POWERNV: move
iommu_add_device earlier).

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fix little endian issues in OPAL flash code
Anton Blanchard [Wed, 23 Apr 2014 21:25:34 +0000 (07:25 +1000)]
powerpc/powernv: Fix little endian issues in OPAL flash code

With this patch I was able to update firmware on an LE kernel.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fix kexec races going back to OPAL
Benjamin Herrenschmidt [Thu, 24 Apr 2014 06:14:25 +0000 (16:14 +1000)]
powerpc/powernv: Fix kexec races going back to OPAL

We have a subtle race when sending CPUs back to OPAL on kexec.

We mark them as "in real mode" right before we send them down. Once
we've booted the new kernel, it might try to call opal_reinit_cpus()
to change endianness, and that requires all CPUs to be spinning inside
OPAL.

However there is no synchronization here and we've observed cases
where the returning CPUs hadn't established their new state inside
OPAL before opal_reinit_cpus() is called, causing it to fail.

The proper fix is to actually wait for them to go down all the way
from the kexec'ing kernel.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Check sysparam size before creation
Joel Stanley [Thu, 24 Apr 2014 07:25:37 +0000 (16:55 +0930)]
powerpc/powernv: Check sysparam size before creation

The size of the sysparam sysfs files is determined from the device tree
at boot. However the buffer is hard coded to 64 bytes. If we encounter a
parameter that is larger than 64, or miss-parse the device tree, the
buffer will overflow when reading or writing to the parameter.

Check it at discovery time, and if the parameter is too large, do not
create a sysfs entry for it.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fix typos in sysparam code
Joel Stanley [Thu, 24 Apr 2014 07:25:36 +0000 (16:55 +0930)]
powerpc/powernv: Fix typos in sysparam code

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Check sysfs size before copying
Joel Stanley [Thu, 24 Apr 2014 07:25:35 +0000 (16:55 +0930)]
powerpc/powernv: Check sysfs size before copying

The sysparam code currently uses the userspace supplied number of
bytes when memcpy()ing in to a local 64-byte buffer.

Limit the maximum number of bytes by the size of the buffer.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Use ssize_t for sysparam return values
Joel Stanley [Thu, 24 Apr 2014 07:25:34 +0000 (16:55 +0930)]
powerpc/powernv: Use ssize_t for sysparam return values

The OPAL calls are returning int64_t values, which the sysparam code
stores in an int, and the sysfs callback returns ssize_t. Make code a
easier to read by consistently using ssize_t.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc/powernv: Fix sysparam sysfs error handling
Joel Stanley [Thu, 24 Apr 2014 07:25:33 +0000 (16:55 +0930)]
powerpc/powernv: Fix sysparam sysfs error handling

When a sysparam query in OPAL returned a negative value (error code),
sysfs would spew out a decent chunk of memory; almost 64K more than
expected. This was traced to a sign/unsigned mix up in the OPAL sysparam
sysfs code at sys_param_show.

The return value of sys_param_show is a ssize_t, calculated using

  return ret ? ret : attr->param_size;

Alan Modra explains:

  "attr->param_size" is an unsigned int, "ret" an int, so the overall
  expression has type unsigned int.  Result is that ret is cast to
  unsigned int before being cast to ssize_t.

Instead of using the ternary operator, set ret to the param_size if an
error is not detected. The same bug exists in the sysfs write callback;
this patch fixes it in the same way.

A note on debugging this next time: on my system gcc will warn about
this if compiled with -Wsign-compare, which is not enabled by -Wall,
only -Wextra.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: Fix Oops in rtas_stop_self()
Li Zhong [Mon, 28 Apr 2014 00:29:51 +0000 (08:29 +0800)]
powerpc: Fix Oops in rtas_stop_self()

commit 41dd03a9 may cause Oops in rtas_stop_self().

The reason is that the rtas_args was moved into stack space. For a box
with more that 4GB RAM, the stack could easily be outside 32bit range,
but RTAS is 32bit.

So the patch moves rtas_args away from stack by adding static before
it.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agopowerpc: Export flush_icache_range
Jeff Mahoney [Sun, 27 Apr 2014 22:10:43 +0000 (18:10 -0400)]
powerpc: Export flush_icache_range

Commit aac416fc38c (lkdtm: flush icache and report actions) calls
flush_icache_range from a module. It's exported on most architectures
that implement it, but not on powerpc. This patch exports it to fix
the module link failure.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
10 years agocpufreq, powernv: Fix build failure on UP
Srivatsa S. Bhat [Wed, 16 Apr 2014 06:05:38 +0000 (11:35 +0530)]
cpufreq, powernv: Fix build failure on UP

Paul Gortmaker reported the following build failure of the powernv cpufreq
driver on UP configs:

drivers/cpufreq/powernv-cpufreq.c:241:2: error: implicit declaration of
function 'cpu_sibling_mask' [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
make[3]: *** [drivers/cpufreq/powernv-cpufreq.o] Error 1
make[2]: *** [drivers/cpufreq] Error 2
make[1]: *** [drivers] Error 2
make: *** [sub-make] Error 2

The trouble here is that cpu_sibling_mask is defined only in <asm/smp.h>,
and <linux/smp.h> includes <asm/smp.h> only in SMP builds.

So fix this build failure by explicitly including <asm/smp.h> in the driver,
so that we get the definition of cpu_sibling_mask even in UP configurations.

Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
10 years agocpufreq: unicore32: replace IS_ERR and PTR_ERR with PTR_ERR_OR_ZERO
Duan Jiong [Fri, 11 Apr 2014 07:59:38 +0000 (15:59 +0800)]
cpufreq: unicore32: replace IS_ERR and PTR_ERR with PTR_ERR_OR_ZERO

This patch fixes coccinelle error regarding usage of IS_ERR and
PTR_ERR instead of PTR_ERR_OR_ZERO.

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
10 years agoLinux 3.15-rc2
Linus Torvalds [Sun, 20 Apr 2014 18:08:50 +0000 (11:08 -0700)]
Linux 3.15-rc2

10 years agoMerge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma
Linus Torvalds [Sun, 20 Apr 2014 17:35:31 +0000 (10:35 -0700)]
Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma

Pull slave-dmaengine fixes from Vinod Koul:
 "Back from long weekend here in India and now the time to send fixes
  for slave dmaengine.
   - Dan's fix of sirf xlate code
   - Jean's fix for timberland
   - edma fixes by Sekhar for SG handling and Yuan for changing init
     call"

* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
  dma: fix eDMA driver as a subsys_initcall
  dmaengine: sirf: off by one in of_dma_sirfsoc_xlate()
  platform: Fix timberdale dependencies
  dma: edma: fix incorrect SG list handling

10 years agoMerge tag 'iommu-fixes-v3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 20 Apr 2014 17:33:49 +0000 (10:33 -0700)]
Merge tag 'iommu-fixes-v3.15-rc1' of git://git./linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:
 "Fixes for regressions:

   - fix wrong IOMMU enumeration causing some SCSI device drivers
     initialization failures
   - ARM-SMMU fixes for a panic condition and a wrong return value"

* tag 'iommu-fixes-v3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/arm-smmu: fix panic in arm_smmu_alloc_init_pte
  iommu/arm-smmu: Return 0 on unmap failure
  iommu/vt-d: fix bug in matching PCI devices with DRHD/RMRR descriptors
  iommu/vt-d: Fix get_domain_for_dev() handling of upstream PCIe bridges
  iommu/vt-d: fix memory leakage caused by commit ea8ea46

10 years agoMerge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 20 Apr 2014 17:32:33 +0000 (10:32 -0700)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull perf tooling fixes from Ingo Molnar:
 "Three small tooling fixes"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf tools: Improve error reporting
  perf tools: Adjust symbols in VDSO
  perf kvm: Fix 'Min time' counting in report command

10 years agoMerge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git...
Ingo Molnar [Sun, 20 Apr 2014 07:53:55 +0000 (09:53 +0200)]
Merge tag 'perf-urgent-for-mingo' of git://git./linux/kernel/git/jolsa/perf into perf/urgent

Pull perf/urgent fixes from Jiri Olsa:

User visible changes:

  * Adjust symbols in VDSO to properly resolve its function names (Vladimir Nikulichev)

  * Improve error reporting for record session failure (Adrien BAK)

  * Fix 'Min time' counting in report command (Alexander Yarygin)

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
10 years agoperf tools: Improve error reporting
Adrien BAK [Fri, 18 Apr 2014 02:00:43 +0000 (11:00 +0900)]
perf tools: Improve error reporting

In the current version, when using perf record, if something goes
wrong in tools/perf/builtin-record.c:375
  session = perf_session__new(file, false, NULL);

The error message:
"Not enough memory for reading per file header"

is issued. This error message seems to be outdated and is not very
helpful. This patch proposes to replace this error message by
"Perf session creation failed"

I believe this issue has been brought to lkml:
https://lkml.org/lkml/2014/2/24/458
although this patch only tackles a (small) part of the issue.

Additionnaly, this patch improves error reporting in
tools/perf/util/data.c open_file_write.

Currently, if the call to open fails, the user is unaware of it.
This patch logs the error, before returning the error code to
the caller.

Reported-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Adrien BAK <adrien.bak@metascale.org>
Link: http://lkml.kernel.org/r/1397786443.3093.4.camel@beast
[ Reorganize the changelog into paragraphs ]
[ Added empty line after fd declaration in open_file_write ]
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
10 years agoperf tools: Adjust symbols in VDSO
Vladimir Nikulichev [Thu, 17 Apr 2014 15:27:01 +0000 (08:27 -0700)]
perf tools: Adjust symbols in VDSO

pert-report doesn't resolve function names in VDSO:

$ perf report --stdio -g flat,0.0,15,callee --sort pid
...
            8.76%
               0x7fff6b1fe861
               __gettimeofday
               ACE_OS::gettimeofday()
...

In this case symbol values should be adjusted the same way as for executables,
relocatable objects and prelinked libraries.

After fix:

$ perf report --stdio -g flat,0.0,15,callee --sort pid
...
            8.76%
               __vdso_gettimeofday
               __gettimeofday
               ACE_OS::gettimeofday()

Signed-off-by: Vladimir Nikulichev <nvs@tbricks.com>
Tested-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Link: http://lkml.kernel.org/r/969812.163009436-sendEmail@nvs
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
10 years agoperf kvm: Fix 'Min time' counting in report command
Alexander Yarygin [Wed, 9 Apr 2014 14:21:59 +0000 (16:21 +0200)]
perf kvm: Fix 'Min time' counting in report command

Every event in the perf-kvm has a 'stats' structure, which contains
max/min/average/etc times of handling this event.
The problem is that the 'perf-kvm stat report' command always shows
that 'min time' is 0us for every event. Example:

 # perf kvm stat report

 Analyze events for all VCPUs:

    VM-EXIT    Samples  Samples%     Time%   Min Time   Max Time Avg time
  [..]
  0xB2 MSCH         12     0.07%     0.00%        0us        8us 7.31us ( +-   2.11% )
  0xB2 CHSC         12     0.07%     0.00%        0us       18us 9.39us ( +-   9.49% )
  0xB2 STPX          8     0.05%     0.00%        0us        2us 1.88us ( +-   7.18% )
  0xB2 STSI          7     0.04%     0.00%        0us       44us 16.49us ( +-  38.20% )
  [..]

This happens because the 'stats' structure is not initialized and
stats->min equals to 0. Lets initialize the structure for every
event after its allocation using init_stats() function. This initializes
stats->min to -1 and makes 'Min time' statistics counting work:

 # perf kvm stat report

 Analyze events for all VCPUs:

    VM-EXIT    Samples  Samples%     Time%   Min Time   Max Time Avg time
  [..]
  0xB2 MSCH         12     0.07%     0.00%        6us        8us 7.31us ( +-   2.11% )
  0xB2 CHSC         12     0.07%     0.00%        7us       18us 9.39us ( +-   9.49% )
  0xB2 STPX          8     0.05%     0.00%        1us        2us 1.88us ( +-   7.18% )
  0xB2 STSI          7     0.04%     0.00%        1us       44us 16.49us ( +-  38.20% )
  [..]

Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/1397053319-2130-3-git-send-email-borntraeger@de.ibm.com
[ Fixing the perf examples changelog output ]
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
10 years agocoredump: fix va_list corruption
Eric Dumazet [Sat, 19 Apr 2014 17:15:07 +0000 (10:15 -0700)]
coredump: fix va_list corruption

A va_list needs to be copied in case it needs to be used twice.

Thanks to Hugh for debugging this issue, leading to various panics.

Tested:

  lpq84:~# echo "|/foobar12345 %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h" >/proc/sys/kernel/core_pattern

'produce_core' is simply : main() { *(int *)0 = 1;}

  lpq84:~# ./produce_core
  Segmentation fault (core dumped)
  lpq84:~# dmesg | tail -1
  [  614.352947] Core dump to |/foobar12345 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 (null) pipe failed

Notice the last argument was replaced by a NULL (we were lucky enough to
not crash, but do not try this on your production machine !)

After fix :

  lpq83:~# echo "|/foobar12345 %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h" >/proc/sys/kernel/core_pattern
  lpq83:~# ./produce_core
  Segmentation fault
  lpq83:~# dmesg | tail -1
  [  740.800441] Core dump to |/foobar12345 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 pipe failed

Fixes: 5fe9d8ca21cc ("coredump: cn_vprintf() has no reason to call vsnprintf() twice")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Diagnosed-by: Hugh Dickins <hughd@google.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@vger.kernel.org # 3.11+
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
10 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 19 Apr 2014 17:41:43 +0000 (10:41 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fix from Ingo Molnar:
 "This fixes the preemption-count imbalance crash reported by Owen
  Kibel"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mce: Fix CMCI preemption bugs

10 years agoMerge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 19 Apr 2014 17:40:51 +0000 (10:40 -0700)]
Merge branch 'sched-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull scheduler fixes from Ingo Molnar:
 "Two fixes:

   - a SCHED_DEADLINE task selection fix
   - a sched/numa related lockdep splat fix"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched: Check for stop task appearance when balancing happens
  sched/numa: Fix task_numa_free() lockdep splat

10 years agoMerge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 19 Apr 2014 17:40:11 +0000 (10:40 -0700)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull perf fixes from Ingo Molnar:
 "Two kernel side fixes:

   - an Intel uncore PMU driver potential crash fix
   - a kprobes/perf-call-graph interaction fix"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel: Use rdmsrl_safe() when initializing RAPL PMU
  kprobes/x86: Fix page-fault handling logic

10 years agoMerge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Sat, 19 Apr 2014 17:35:30 +0000 (10:35 -0700)]
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "Unfortunately this contains no easter eggs, its a bit larger than I'd
  like, but I included a patch that just moves code from one file to
  another and I'd like to avoid merge conflicts with that later, so it
  makes it seem worse than it is,

  Otherwise:
   - radeon: fixes to use new microcode to stabilise some cards, use
     some common displayport code, some runtime pm fixes, pll regression
     fixes
   - i915: fix for some context oopses, a warn in a used path, backlight
     fixes
   - nouveau: regression fix
   - omap: a bunch of fixes"

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (51 commits)
  drm: bochs: drop unused struct fields
  drm: bochs: add power management support
  drm: cirrus: add power management support
  drm: Split out drm_probe_helper.c from drm_crtc_helper.c
  drm/plane-helper: Don't fake-implement primary plane disabling
  drm/ast: fix value check in cbr_scan2
  drm/nouveau/bios: fix a bit shift error introduced by 457e77b
  drm/radeon/ci: make sure mc ucode is loaded before checking the size
  drm/radeon/si: make sure mc ucode is loaded before checking the size
  drm/radeon: improve PLL params if we don't match exactly v2
  drm/radeon: memory leak on bo reservation failure. v2
  drm/radeon: fix VCE fence command
  drm/radeon: re-enable mclk dpm on R7 260X asics
  drm/radeon: add support for newer mc ucode on CI (v2)
  drm/radeon: add support for newer mc ucode on SI (v2)
  drm/radeon: apply more strict limits for PLL params v2
  drm/radeon: update CI DPM powertune settings
  drm/radeon: fix runpm handling on APUs (v4)
  drm/radeon: disable mclk dpm on R7 260X
  drm/tegra: Remove gratuitous pad field
  ...

10 years agoMerge branch 'drm-next-3.15-wip' of git://people.freedesktop.org/~deathsimple/linux...
Dave Airlie [Sat, 19 Apr 2014 01:16:02 +0000 (11:16 +1000)]
Merge branch 'drm-next-3.15-wip' of git://people.freedesktop.org/~deathsimple/linux into drm-next

Some i2c fixes over DisplayPort.

* 'drm-next-3.15-wip' of git://people.freedesktop.org/~deathsimple/linux:
  drm/radeon: Improve vramlimit module param documentation
  drm/radeon: fix audio pin counts for DCE6+ (v2)
  drm/radeon/dp: switch to the common i2c over aux code
  drm/dp/i2c: Update comments about common i2c over dp assumptions (v3)
  drm/dp/i2c: send bare addresses to properly reset i2c connections (v4)
  drm/radeon/dp: handle zero sized i2c over aux transactions (v2)
  drm/i915: support address only i2c-over-aux transactions
  drm/tegra: dp: Support address-only I2C-over-AUX transactions