linux.git/arch/powerpc/kernel/prom_init.c, branch v2.6.35

powerpc: Linux cannot run with 0 cores

2010-07-08T08:11:42+00:00

If we configure with CONFIG_SMP=n or set NR_CPUS less than the number of
SMT threads we will set the max cores property to 0 in the
ibm,client-architecture-support structure. On new versions of firmware that
understand this property it obliges and terminates our partition.

Use DIV_ROUND_UP so we handle not only the CONFIG_SMP=n case but also the
case where NR_CPUS isn't a multiple of the number of SMT threads.

Signed-off-by: Anton Blanchard 
Acked-by: Paul E. McKenney 
Signed-off-by: Benjamin Herrenschmidt

powerpc/numa: Add form 1 NUMA affinity

2010-04-28T06:22:33+00:00

Firmware changed the way it represents memory and cpu affinity on POWER7.
Unfortunately the old method now caps the topology to work around issues
with legacy operating systems. For Linux to get the correct topology we
need to use the new form 1 affinity information.

We set the form 1 field in the client architecture, and if we see "1" in the
ibm,associativity-form property firmware supports form 1 affinity and
we should look at the first field in the ibm,associativity-reference-points
array. If not we use the second field as we always have.

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

powerpc/pseries: Pass more accurate number of supported cores to firmware

2010-02-04T03:33:54+00:00

Updated variant of a patch by Joel Schopp.

The field containing the number of supported cores which we pass to
firmware via the ibm,client-architecture call was set by a previous
patch statically as high as is possible (NR_CPUS).

However, that value isn't quite right for a system that supports
multiple threads per core, thus permitting the firmware to assign
more cores to a Linux partition than it can really cope with.

This patch improves it by using the device-tree to determine the
number of threads supported by the processors in order to adjust
the value passed to firmware.

Signed-off-by: Joel Schopp 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Add static fields to ibm,client-architecture call

2010-02-03T06:41:13+00:00

This patch adds 2 fields to the ibm_architecture_vec array.

The first of these fields indicates the number of cores which Linux can
boot.  It does not account for SMT, so it may result in cpus assigned to
Linux which cannot be booted.  A second patch follows that dynamically
updates this for SMT.

The second field just indicates that our OS is Linux, and not another
OS.  The system may or may not use this hint to performance tune
settings for Linux.

Signed-off-by: Joel Schopp 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix ibm,client-architecture-support printout

2009-09-24T05:31:47+00:00

On machines without the ibm,client-architecture-support call we were missing a
newline. We may as well print the full name in all its glory too - its
ibm,client-architecture-support, not ibm,client-architecture as I mistakenly
wrote (a name only an IBM architect could love).

For my penance I will write out ibm,client-architecture-support 100 times.

Before:

Calling ibm,client-architecture...command line: root=/dev/sda6 console=hvc0  quiet

After:

Calling ibm,client-architecture-support... not implemented
command line: root=/dev/sda6 console=hvc0

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

powerpc/prom_init: Evaluate mem kernel parameter for early allocation

2009-08-20T00:29:25+00:00

Evaluate mem kernel parameter for early memory allocations. If mem is set
no allocation in the region above the given boundary is allowed. The current
code doesn't take care about this and allocate memory above the given mem
boundary.

Signed-off-by: Benjamin Krill 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Move definitions of secondary CPU spinloop to header file

2009-08-20T00:12:44+00:00

Those definitions are currently declared extern in the .c file where
they are used, move them to a header file instead.

Signed-off-by: Benjamin Herrenschmidt

edac: cpc925 MC platform device setup

2009-06-18T20:03:57+00:00

Fix up the number of cells for the values of CPC925 Memory Controller,
and setup related platform device during system booting up, against
which CPC925 Memory Controller EDAC driver would be matched.

Signed-off-by: Harry Ciao 
Cc: Doug Thompson 
Cc: Michael Ellerman 
Cc: Benjamin Herrenschmidt 
Cc: Kumar Gala 
Cc: Paul Mackerras 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fbdev: move logo externs to header file

2009-06-17T02:47:57+00:00

Now we have __initconst, we can finally move the external declarations for
the various Linux logo structures to .

James' ack dates back to the previous submission (way to long ago), when the
logos were still __initdata, which caused failures on some platforms with some
toolchain versions.

Signed-off-by: Geert Uytterhoeven 
Acked-by: James Simmons 
Cc: Krzysztof Helt 
Cc: Sam Ravnborg 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

powerpc/pseries: Fix ibm,client-architecture comment

2009-04-07T05:18:59+00:00

We specify a 64MB RMO, but the comment says 128MB.

Signed-off-by: Anton Blanchard 
Signed-off-by: Paul Mackerras