linux-stable.git/arch/powerpc/kernel/smp.c, branch linux-3.13.y

powerpc: Fix topology core_id endian issue on LE builds

2013-12-13T04:48:34+00:00

cpu_to_core_id() is missing a byteswap:

cat /sys/devices/system/cpu/cpu63/topology/core_id
201326592

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Make cpu_to_chip_id() available when SMP=n

2013-11-20T23:33:44+00:00

Up until now we have only used cpu_to_chip_id() in the topology code,
which is only used on SMP builds. However my recent commit a4da0d5
"Implement arch_get_random_long/int() for powernv" added a usage when
SMP=n, breaking the build.

Move cpu_to_chip_id() into prom.c so it is available for SMP=n builds.

We would move the extern to prom.h, but that breaks the include in
topology.h. Instead we leave it in smp.h, but move it out of the
CONFIG_SMP #ifdef. We also need to include asm/smp.h in rng.c, because
the linux version skips asm/smp.h on UP. What a mess.

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

hotplug, powerpc, x86: Remove cpu_hotplug_driver_lock()

2013-09-30T17:55:51+00:00

cpu_hotplug_driver_lock() serializes CPU online/offline operations
when ARCH_CPU_PROBE_RELEASE is set.  This lock interface is no longer
necessary with the following reason:

 - lock_device_hotplug() now protects CPU online/offline operations,
   including the probe & release interfaces enabled by
   ARCH_CPU_PROBE_RELEASE.  The use of cpu_hotplug_driver_lock() is
   redundant.
 - cpu_hotplug_driver_lock() is only valid when ARCH_CPU_PROBE_RELEASE
   is defined, which is misleading and is only enabled on powerpc.

This patch removes the cpu_hotplug_driver_lock() interface.  As
a result, ARCH_CPU_PROBE_RELEASE only enables / disables the cpu
probe & release interface as intended.  There is no functional change
in this patch.

Signed-off-by: Toshi Kani 
Reviewed-by: Nathan Fontenot 
Signed-off-by: Rafael J. Wysocki

powerpc: Export cpu_to_chip_id() to fix build error

2013-09-11T01:39:37+00:00

powerpc allmodconfig build fails with:

ERROR: ".cpu_to_chip_id" [drivers/block/mtip32xx/mtip32xx.ko] undefined!

The problem was introduced with commit 15863ff3b (powerpc: Make chip-id
information available to userspace).

Export the missing symbol.

Cc: Vasant Hegde 
Cc: Shivaprasad G Bhat 
Signed-off-by: Guenter Roeck 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Little endian SMP IPI demux

2013-08-14T05:33:37+00:00

Add little endian support for demuxing SMP IPIs

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Make chip-id information available to userspace

2013-08-14T05:33:17+00:00

So far "/sys/devices/system/cpu/cpuX/topology/physical_package_id"
was always default (-1) on ppc64 architecture.

Now, some systems have an ibm,chip-id property in the cpu nodes in
the device tree. On these systems, we now use this information to
display physical_package_id.

Signed-off-by: Vasant Hegde 
Signed-off-by: Shivaprasad G Bhat 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Use ibm, chip-id property to compute cpu_core_mask if available

2013-08-14T05:00:22+00:00

Some systems have an ibm,chip-id property in the cpu nodes in the
device tree.  On these systems, we now use that to compute the
cpu_core_mask (i.e. the set of core siblings) rather than looking
at cache properties.

Signed-off-by: Paul Mackerras 
Tested-by: Vasant Hegde 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Pull out cpu_core_mask updates into a separate function

2013-08-14T05:00:16+00:00

This factors out the details of updating cpu_core_mask into a separate
function, to make it easier to change how the mask is calculated later.
This makes no functional change.

Signed-off-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Add smp_generic_cpu_bootable

2013-08-14T04:56:50+00:00

Cell and PSeries both implemented their own versions of a
cpu_bootable smp_op which do the same thing (well, the PSeries
one has support for more than 2 threads). Copy the PSeries one
to generic code, and rename it smp_generic_cpu_bootable.

Signed-off-by: Andy Fleming 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix a number of sparse warnings

2013-08-14T01:50:24+00:00

Address some of the trivial sparse warnings in arch/powerpc.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt