- Allocate IRQs for VIO devices during probing.
- Allow clients to specify if IRQs would be allocated for a given
  VIO device.
- Cache the device handle of the root node of channel-devices sub-tree in
  Machine Description (MDESC).
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Check if a client is supported, by comparing against a whitelist, to
register for notifications from Machine Description (MDESC)
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Removes restriction on VIO device's size limit. Since KOBJ_NAME_LEN
has been dropped from kobject, there doesn't seem to be a
restriction on the device name anymore. This limit therefore
doesn't make sense.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Refactors code to get the cfg_handle property of a node from Machine
Description (MDESC)
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the MDESC node name of MDESC client to VIO device metadata. It is
later used to uniquely identify a node in the MDESC. VIO & MDESC APIs
are updated to handle this node name.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

During MDESC handle allocation, use the __GFP_REPEAT flag instead of
__GFP_NOFAIL. If memory is not available, the caller expects a NULL
pointer instead of waiting until memory is allocated.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the following two APIs to Machine Description (MDESC)
- mdesc_get_node: Searches for a node in the Machine
  Description tree based on given information about
  that node.
- mdesc_get_node_info: Retrieves information about a
  given node.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

LDC channels in RAW mode does not provide any session management. No
handshake protocol is defined for LDC channels in RAW mode. It's
therefore skipped.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Specify the class of VIO device in the version info. packet. The device's
class identifies the type of VIO device, whether it's DISK, CONSOLE,
NETWORK, etc... This packet is used in the handshake between the
client and server for this device.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

It's possible that VIO operations are not defined for some VIO
clients. In that case, VIO ops pointer should be checked for
NULL before being used
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

of_device_ids are not supposed to change at runtime. All functions
working with of_device_ids provided by <linux/of.h> work with const
of_device_ids. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

of_device_ids are not supposed to change at runtime. All functions
working with of_device_ids provided by <linux/of.h> work with const
of_device_ids. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pavel Tatashin says:

====================
sparc64: Early boot timestamp fixes

Guenter Roeck reported a problem that was introduced by early boot
timestamp changes. Where: tick_get_frequency() returns 0.
====================
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

After early boot time stamps project the %tick frequency is detected
incorrectly on spittfire cpus.

We must use cpuid of boot cpu to find corresponding cpu node in OpenBoot,
and extract clock-frequency property from there.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We initialize time early, we must use prom interface instead of open
firmware driver, which is not yet initialized.

Also, use prom_getintdefault() instead of prom_getint() to be compatible
with the code before early boot timestamps project.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pavel Tatashin says:

====================
sparc64: Early boot timestamp

Changelog:
	v2 - v3:
		- __aligned(64) -> __cacheline_aligned
		- Replaced in sched_clock() wmb() with barrier()
	v1 - v2:
		- Early boot timestamps are now available on all 64-bit
		  sparc processors
		- New hot-patched get_tick() function.

This patch set:
- enables early boot timestamps on SPARC,
- adds offset so we count time from zero, the same as it is done on other
  platforms
- improves the performance by inling, hot patching, and combining loads
  into the same cacheline. (and few other optimizations).

So, the final performance of sched_clock() is faster than now: the fewer
number of loads, and all of them are coming from the same cacheline. Loads
can run while we are reading tick value, and we do not do function call.

Current sched_clock():
sethi  %hi(0xb9b400), %g1
ldx  [ %g1 + 0x250 ], %g1
ldx  [ %g1 ], %g1
call  %g1
nop
sethi  %hi(0xb9b400), %g1
ldx  [ %g1 + 0x300 ], %g1
mulx  %o0, %g1, %g1
rett  %i7 + 8
srlx  %g1, 0xa, %o0

Final sched_clock():
sethi  %hi(0xb9b400), %g1
ldx  [ %g1 + 0x2c8 ], %g2
ldx  [ %g1 + 0x2c0 ], %g1
b  42f638 <sched_clock+0x44>
rd  %asr24, %i0
...
sllx  %i0, 1, %i0
srlx  %i0, 1, %i0
mulx  %i0, %g1, %i0
srlx  %i0, 0xa, %i0
rett  %i7 + 8
sub  %o0, %g2, %o0
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Replace read tick function pointers with the new hot-patched get_tick().
This optimizes the performance of functions such as: sched_clock()
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the new get_tick() function that is hot-patched during boot based on
processor we are booting on.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In Linux it is possible to configure printk() to output timestamp next to
every line. This is very useful to determine the slow parts of the boot
process, and also to avoid regressions, as boot time is visiable to
everyone.

Also, there are scripts that change these time stamps to intervals.

However, on larger machines these timestamps start appearing many seconds,
and even minutes into the boot process. This patch gets stick-frequency
property early from OpenBoot, and uses its value to initialize time stamps
before the first printk() messages are printed.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch prepares the code for early boot time stamps by making it more
modular.

- init_tick_ops() to initialize struct sparc64_tick_ops
- new sparc64_tick_ops operation get_frequency() which returns a
  frequency
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In clock sched we now have three loads:
	- Function pointer
	- quotient for multiplication
	- offset

However, it is possible to improve performance substantially, by
guaranteeing that all three loads are from the same cacheline.

By moving these three values first in sparc64_tick_ops, and by having
tick_operations 64-byte aligned we guarantee this.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

On most platforms, time is shown from the beginning of boot.  This patch is
adding offset to sched_clock() for SPARC, to also show time from 0.

This means we will have one more load, but we saved one in an ealier patch.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In timer_64.c tick functions are access via pointer (tick_ops), every time
clock is read, there is one extra load to get to the function.

This patch optimizes it, by accessing functions pointer from value.

Current ched_clock():
sethi  %hi(0xb9b400), %g1
ldx  [ %g1 + 0x250 ], %g1  ! <tick_ops>
ldx  [ %g1 ], %g1
call  %g1
nop
sethi  %hi(0xb9b400), %g1
ldx  [ %g1 + 0x300 ], %g1  ! <timer_ticks_per_nsec_quotient>
mulx  %o0, %g1, %g1
rett  %i7 + 8
srlx  %g1, 0xa, %o0

New sched_clock():
sethi  %hi(0xb9b400), %g1
ldx  [ %g1 + 0x340 ], %g1
call  %g1
nop
sethi  %hi(0xb9b400), %g1
ldx  [ %g1 + 0x378 ], %g1
mulx  %o0, %g1, %g1
rett  %i7 + 8
srlx  %g1, 0xa, %o0

Before three loads, now two loads.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

A few changes that were reported by checkpatch, removed all trailing white
spaces in these two files.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jag Raman says:

====================
sparc64: LDC changes for porting VCC driver into upstream kernel

This series of patches is part of an effort to add VCC (Virtual Console
Concentrator) support to Linux.

VCC enables the virtualization of serial console on SPARC processors. VCC
provides access to the guest domain's serial console.

VCC depends on some core functionalities in the linux kernel for SPARC. The
functionalities include LDC (Logical Domain Channels), MDESC (Machine
Descriptor) and VIO (Virtual IO protocol). In order for VCC to be enabled,
it requires that these core functionalities support them.

This series of patches adds LDC support to enable VCC on Linux. It
is the first batch of changes to enable VCC.

This version 4 of the series addresses the following changes
suggested by Dave Miller
Patch 1/5: Modifies ldc_print/__ldc_print to print caller name. Fixes
           indentation of wrapped lines.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Print debug messages when reading from given LDC channel.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Orabug: 20902628

When an ldc control-only packet is received during data exchange in
read_nonraw(), a new rx head is calculated but the rx queue head is not
actually advanced (rx_set_head() is not called) and a branch is taken to
'no_data' at which point two things can happen depending on the value
of the newly calculated rx head and the current rx tail:

- If the rx queue is determined to be not empty, then the wrong packet
  is picked up.

- If the rx queue is determined to be empty, then a read error (EAGAIN)
  is eventually returned since it is falsely assumed that more data was
  expected.

The fix is to update the rx head and return in case of a control only
packet during data exchange.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Ensure that LDC channel is up before writing to it, in RAW mode. Generate
event to bring the LDC channel up, if it's not up already.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Enhance ldc_abort to accept a message to be printed when it is called. Add
a macro, LDC_ABORT, to print info. about the function that calls ldc_abort.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the following LDC APIs which are planned to be used by
LDC clients in the future:
- ldc_set_state: Sets given LDC channel to given state
- ldc_mode: Returns the mode of given LDC channel
- ldc_print: Prints info about given LDC channel
- ldc_rx_reset: Reset the RX queue of given LDC channel
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull UFS fixes from Al Viro:
 "This is just the obvious backport fodder; I'm pretty sure that there
  will be more - definitely so wrt performance and quite possibly
  correctness as well"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ufs: we need to sync inode before freeing it
  excessive checks in ufs_write_failed() and ufs_evict_inode()
  ufs_getfrag_block(): we only grab ->truncate_mutex on block creation path
  ufs_extend_tail(): fix the braino in calling conventions of ufs_new_fragments()
  ufs: set correct ->s_maxsize
  ufs: restore maintaining ->i_blocks
  fix ufs_isblockset()
  ufs: restore proper tail allocation

Pull btrfs fixes from Chris Mason:
 "Some fixes that Dave Sterba collected.

  We've been hitting an early enospc problem on production machines that
  Omar tracked down to an old int->u64 mistake. I waited a bit on this
  pull to make sure it was really the problem from production, but it's
  on ~2100 hosts now and I think we're good.

  Omar also noticed a commit in the queue would make new early ENOSPC
  problems. I pulled that out for now, which is why the top three
  commits are younger than the rest.

  Otherwise these are all fixes, some explaining very old bugs that
  we've been poking at for a while"

* 'for-linus-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: fix delalloc accounting leak caused by u32 overflow
  Btrfs: clear EXTENT_DEFRAG bits in finish_ordered_io
  btrfs: tree-log.c: Wrong printk information about namelen
  btrfs: fix race with relocation recovery and fs_root setup
  btrfs: fix memory leak in update_space_info failure path
  btrfs: use correct types for page indices in btrfs_page_exists_in_range
  btrfs: fix incorrect error return ret being passed to mapping_set_error
  btrfs: Make flush bios explicitely sync
  btrfs: fiemap: Cache and merge fiemap extent before submit it to user

Pull x86 fixes from Ingo Molnar:
 "Misc fixes: a Geode fix plus a microcode loader fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/microcode/intel: Clear patch pointer before jettisoning the initrd
  x86/cpu/cyrix: Add alternative Device ID of Geode GX1 SoC

Pull CPU hotplug fix from Ingo Molnar:
 "An error handling corner case fix"

* 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Drop the device lock on error

Pull RCU fixes from Ingo Molnar:
 "Fix an SRCU bug affecting KVM IRQ injection"

* 'rcu-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  srcu: Allow use of Classic SRCU from both process and interrupt context
  srcu: Allow use of Tiny/Tree SRCU from both process and interrupt context

Pull perf fixes from Ingo Molnar:
 "This is mostly tooling fixes, plus an instruction pointer filtering
  fix.

  It's more fixes than usual - Arnaldo got back from a longer vacation
  and there was a backlog"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
  perf symbols: Kill dso__build_id_is_kmod()
  perf symbols: Keep DSO->symtab_type after decompress
  perf tests: Decompress kernel module before objdump
  perf tools: Consolidate error path in __open_dso()
  perf tools: Decompress kernel module when reading DSO data
  perf annotate: Use dso__decompress_kmodule_path()
  perf tools: Introduce dso__decompress_kmodule_{fd,path}
  perf tools: Fix a memory leak in __open_dso()
  perf annotate: Fix symbolic link of build-id cache
  perf/core: Drop kernel samples even though :u is specified
  perf script python: Remove dups in documentation examples
  perf script python: Updated trace_unhandled() signature
  perf script python: Fix wrong code snippets in documentation
  perf script: Fix documentation errors
  perf script: Fix outdated comment for perf-trace-python
  perf probe: Fix examples section of documentation
  perf report: Ensure the perf DSO mapping matches what libdw sees
  perf report: Include partial stacks unwound with libdw
  perf annotate: Add missing powerpc triplet
  perf test: Disable breakpoint signal tests for powerpc
  ...

Pull EFI fix from Ingo Molnar:
 "A boot crash fix for certain systems where the kernel would trust a
  piece of firmware data it should not have"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi: Fix boot panic because of invalid BGRT image address

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Pull IOMMU fixes from Joerg Roedel:

 - another compile-fix for my header cleanup

 - a couple of fixes for the recently merged IOMMU probe deferal code

 - fixes for ACPI/IORT code necessary with IOMMU probe deferal

* tag 'iommu-fixes-v4.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  arm: dma-mapping: Reset the device's dma_ops
  ACPI/IORT: Move the check to get iommu_ops from translated fwspec
  ARM: dma-mapping: Don't tear down third-party mappings
  ACPI/IORT: Ignore all errors except EPROBE_DEFER
  iommu/of: Ignore all errors except EPROBE_DEFER
  iommu/of: Fix check for returning EPROBE_DEFER
  iommu/dma: Fix function declaration