linux-toradex.git/arch/powerpc/include/asm/lppaca.h, branch v3.17

powerpc: Make slb_shadow a local

2013-12-09T00:40:25+00:00

The only external user of slb_shadow is the pseries lpar code, and it
can access through the paca array instead.

Signed-off-by: Jeremy Kerr 
Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Fix dedicated processor partition detection

2013-10-30T05:01:43+00:00

commit f13c13a00512 (powerpc: Stop using non-architected shared_proc
field in lppaca) fixed a potential issue with shared/dedicated
partition detection. The old method of detection relied on an
unarchitected field (shared_proc), and this patch switched
to using something architected (a non zero yield_count).

Unfortunately the assertion in the Linux header that yield_count
is only non zero on shared processor partitions is not true. It
turns out dedicated processor partitions can increment yield_count
and as such we falsely detect dedicated partitions as shared.

Fix the comment, and switch back to using the old method.

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

powerpc: Add endian annotations to lppaca, slb_shadow and dtl_entry

2013-08-14T05:33:34+00:00

Add endian annotation to various hypervisor structures which
are defined as big endian.

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

powerpc: Stop using non-architected shared_proc field in lppaca

2013-08-14T01:50:26+00:00

Although the shared_proc field in the lppaca works today, it is
not architected. A shared processor partition will always have a non
zero yield_count so use that instead. Create a wrapper so users
don't have to know about the details.

In order for older kernels to continue to work on KVM we need
to set the shared_proc bit. While here, remove the ugly bitfield.

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

powerpc/pseries: Inform the hypervisor we are using EBB regs

2013-07-01T01:50:17+00:00

On LPAR systems we need to inform the hypervisor that we are using the
EBB registers. We do this by setting a bit in the Virtual Processor Area
(VPA) - formerly known as the lppaca.

For now we do this always, ie. we do not dynamically enable/disable.

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

cputime: Generic on-demand virtual cputime accounting

2013-01-27T18:23:27+00:00

If we want to stop the tick further idle, we need to be
able to account the cputime without using the tick.

Virtual based cputime accounting solves that problem by
hooking into kernel/user boundaries.

However implementing CONFIG_VIRT_CPU_ACCOUNTING require
low level hooks and involves more overhead. But we already
have a generic context tracking subsystem that is required
for RCU needs by archs which plan to shut down the tick
outside idle.

This patch implements a generic virtual based cputime
accounting that relies on these generic kernel/user hooks.

There are some upsides of doing this:

- This requires no arch code to implement CONFIG_VIRT_CPU_ACCOUNTING
if context tracking is already built (already necessary for RCU in full
tickless mode).

- We can rely on the generic context tracking subsystem to dynamically
(de)activate the hooks, so that we can switch anytime between virtual
and tick based accounting. This way we don't have the overhead
of the virtual accounting when the tick is running periodically.

And one downside:

- There is probably more overhead than a native virtual based cputime
accounting. But this relies on hooks that are already set anyway.

Signed-off-by: Frederic Weisbecker 
Cc: Andrew Morton 
Cc: Ingo Molnar 
Cc: Li Zhong 
Cc: Namhyung Kim 
Cc: Paul E. McKenney 
Cc: Paul Gortmaker 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Cc: Thomas Gleixner

powerpc: Reformat lppaca.h

2012-04-30T05:37:16+00:00

Reformat lppaca.h to match Linux coding standards.

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

powerpc: Remove iseries specific fields in lppaca

2012-04-30T05:37:16+00:00

Remove all the iseries specific fields in the lppaca.

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

powerpc: Clean up lppaca->cede_latency_hint

2012-04-30T05:37:15+00:00

We have a union containing fields from the old iseries hypervisor
that has been reused for the cede latency hint. Since we no
longer support iseries, remove the union completely.

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

powerpc: Remove the remaining CONFIG_PPC_ISERIES pieces

2012-03-21T00:16:12+00:00

Signed-off-by: Stephen Rothwell 
Signed-off-by: Benjamin Herrenschmidt