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  1. 26 4月, 2013 3 次提交
    • N
      powerpc/pseries: Use stop machine to update cpu maps · 30c05350
      由 Nathan Fontenot 提交于 
      The new PRRN firmware feature allows CPU and memory resources to be
transparently reassigned across NUMA boundaries. When this happens, the
kernel must update the node maps to reflect the new affinity information.

Although the NUMA maps can be protected by locking primitives during the
update itself, this is insufficient to prevent concurrent accesses to these
structures. Since cpumask_of_node() hands out a pointer to these
structures, they can still be modified outside of the lock. Furthermore,
tracking down each usage of these pointers and adding locks would be quite
invasive and difficult to maintain.

The approach used is to make a list of affected cpus and call stop_machine
to have the update routine run on each of the affected cpus allowing them
to update themselves. Each cpu finds itself in the list of cpus and makes
the appropriate updates. We need to have each cpu do this for themselves to
handle calls to vdso_getcpu_init() added in a subsequent patch.

Situations like these are best handled using stop_machine(). Since the NUMA
affinity updates are exceptionally rare events, this approach has the
benefit of not adding any overhead while accessing the NUMA maps during
normal operation.
Signed-off-by: NNathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      30c05350
    • J
      powerpc/pseries: Update CPU maps when device tree is updated · 5d88aa85
      由 Jesse Larrew 提交于 
      Platform events such as partition migration or the new PRRN firmware
feature can cause the NUMA characteristics of a CPU to change, and these
changes will be reflected in the device tree nodes for the affected
CPUs.

This patch registers a handler for Open Firmware device tree updates
and reconfigures the CPU and node maps whenever the associativity
changes. Currently, this is accomplished by marking the affected CPUs in
the cpu_associativity_changes_mask and allowing
arch_update_cpu_topology() to retrieve the new associativity information
using hcall_vphn().

Protecting the NUMA cpu maps from concurrent access during an update
operation will be addressed in a subsequent patch in this series.
Signed-off-by: NNathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      5d88aa85
    • N
      powerpc/pseries: Update numa.c to use updated firmware_has_feature() · 8002b0c5
      由 Nathan Fontenot 提交于 
      Update the numa code to use the updated firmware_has_feature() when checking
for type 1 affinity.
Signed-off-by: NNathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      8002b0c5
  3. 18 4月, 2013 2 次提交
    • S
      powerpc: fix annotation of fake_numa_create_new_node() · 55671f3c
      由 Stephen Rothwell 提交于 
      This function has always been marked as __cpuinit, but is only called
from functions marked as __init and references an __initdata variable.
So change its annotation to __init.

Fixes this build warning:

WARNING: arch/powerpc/mm/built-in.o(.cpuinit.text+0x86): Section mismatch in reference from the function .fake_numa_create_new_node() to the variable .init.data:cmdline
The function __cpuinit .fake_numa_create_new_node() references
a variable __initdata cmdline.
If cmdline is only used by .fake_numa_create_new_node then
annotate cmdline with a matching annotation.
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
      55671f3c
    • V
      powerpc: fix numa distance for form0 device tree · 7122beee
      由 Vaidyanathan Srinivasan 提交于 
      The following commit breaks numa distance setup for old powerpc
systems that use form0 encoding in device tree.

commit 41eab6f8
powerpc/numa: Use form 1 affinity to setup node distance

Device tree node /rtas/ibm,associativity-reference-points would
index into /cpus/PowerPCxxxx/ibm,associativity based on form0 or
form1 encoding detected by ibm,architecture-vec-5 property.

All modern systems use form1 and current kernel code is correct.
However, on older systems with form0 encoding, the numa distance
will get hard coded as LOCAL_DISTANCE for all nodes.  This causes
task scheduling anomaly since scheduler will skip building numa
level domain (topmost domain with all cpus) if all numa distances
are same.  (value of 'level' in sched_init_numa() will remain 0)

Prior to the above commit:
((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)

Restoring compatible behavior with this patch for old powerpc systems
with device tree where numa distance are encoded as form0.
Signed-off-by: NVaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
      7122beee
  5. 15 11月, 2012 1 次提交
  7. 05 9月, 2012 1 次提交
  9. 10 7月, 2012 1 次提交
  11. 03 7月, 2012 1 次提交
  13. 29 6月, 2012 1 次提交
  15. 29 3月, 2012 1 次提交
  17. 13 1月, 2012 1 次提交
  19. 22 12月, 2011 1 次提交
    • K
      cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem · 8a25a2fd
      由 Kay Sievers 提交于 
      This moves the 'cpu sysdev_class' over to a regular 'cpu' subsystem
and converts the devices to regular devices. The sysdev drivers are
implemented as subsystem interfaces now.

After all sysdev classes are ported to regular driver core entities, the
sysdev implementation will be entirely removed from the kernel.

Userspace relies on events and generic sysfs subsystem infrastructure
from sysdev devices, which are made available with this conversion.

Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@amd64.org>
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Cc: Len Brown <lenb@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: NKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      8a25a2fd
  21. 19 12月, 2011 2 次提交
  23. 09 12月, 2011 1 次提交
    • T
      powerpc: Use HAVE_MEMBLOCK_NODE_MAP · 1d7cfe18
      由 Tejun Heo 提交于 
      powerpc doesn't access early_node_map[] directly and enabling
HAVE_MEMBLOCK_NODE_MAP is trivial - replacing add_active_range() calls
with memblock_set_node() and selecting HAVE_MEMBLOCK_NODE_MAP is
enough.
Signed-off-by: NTejun Heo <tj@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>
      1d7cfe18
  25. 02 12月, 2011 1 次提交
  27. 08 11月, 2011 1 次提交
  29. 01 11月, 2011 1 次提交
  31. 20 9月, 2011 3 次提交
  33. 15 7月, 2011 1 次提交
  35. 04 5月, 2011 1 次提交
  37. 27 4月, 2011 1 次提交
  39. 31 3月, 2011 1 次提交
  41. 10 3月, 2011 1 次提交
  43. 07 2月, 2011 8 次提交
  45. 12 1月, 2011 1 次提交
  47. 11 1月, 2011 1 次提交
    • J
      powerpc/pseries: Fix VPHN build errors on non-SMP systems · 39bf990e
      由 Jesse Larrew 提交于 
      The header asm/hvcall.h was previously included indirectly via
smp.h. On non-SMP systems, however, these declarations are excluded
and the build breaks. This is easily fixed by including asm/hvcall.h
directly.

The VPHN feature is only meaningful on NUMA systems that implement
the SPLPAR option, so exclude the VPHN code on systems without
SPLPAR enabled.

Also, expose unmap_cpu_from_node() on systems with SPLPAR enabled,
even if CONFIG_HOTPLUG_CPU is disabled.

Lastly, map_cpu_to_node() is now needed by VPHN to manipulate the
node masks after boot time, so remove the __cpuinit annotation to
fix a section mismatch.
Signed-off-by: NJesse Larrew <jlarrew@linux.vnet.ibm.com>
      39bf990e
  49. 09 12月, 2010 1 次提交
  51. 29 11月, 2010 1 次提交
  53. 13 10月, 2010 1 次提交
    • Y
      memblock, bootmem: Round pfn properly for memory and reserved regions · c7fc2de0
      由 Yinghai Lu 提交于 
      We need to round memory regions correctly -- specifically, we need to
round reserved region in the more expansive direction (lower limit
down, upper limit up) whereas usable memory regions need to be rounded
in the more restrictive direction (lower limit up, upper limit down).

This introduces two set of inlines:

	memblock_region_memory_base_pfn()
	memblock_region_memory_end_pfn()
	memblock_region_reserved_base_pfn()
	memblock_region_reserved_end_pfn()

Although they are antisymmetric (and therefore are technically
duplicates) the use of the different inlines explicitly documents the
programmer's intention.

The lack of proper rounding caused a bug on ARM, which was then found
to also affect other architectures.
Reported-by: NRussell King <rmk@arm.linux.org.uk>
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
LKML-Reference: <4CB4CDFD.4020105@kernel.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>
      c7fc2de0