linux-toradex.git/arch/powerpc/include/asm/kexec.h, branch v3.4.53

powerpc: Cleanup crash/kexec code

2011-12-08T03:02:23+00:00

Remove some unnecessary defines and fix some spelling mistakes.

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

powerpc: Remove broken and complicated kdump system reset code

2011-12-08T03:02:22+00:00

We have a lot of complicated logic that handles possible recursion between
kdump and a system reset exception. We can solve this in a much simpler
way using the same setjmp/longjmp tricks xmon does.

As a first step, this patch removes the old system reset code.

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

powerpc/44x: Kexec support for PPC440X chipsets

2011-08-11T17:50:37+00:00

This patch adds kexec support for PPC440 based chipsets.  This work is based
on the KEXEC patches for FSL BookE.

The FSL BookE patch and the code flow could be found at the link below:

	http://patchwork.ozlabs.org/patch/49359/

Steps:

1) Invalidate all the TLB entries except the one this code is run from
2) Create a tmp mapping for our code in the other address space and jump to it
3) Invalidate the entry we used
4) Create a 1:1 mapping for 0-2GiB in blocks of 256M
5) Jump to the new 1:1 mapping and invalidate the tmp mapping

I have tested this patches on Ebony, Sequoia boards and Virtex on QEMU.

You need kexec-tools commit e8b7939b1e or newer for ppc440x support, 
available at:

 git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git

Signed-off-by: 	Suzuki Poulose 
Cc:	Sebastian Andrzej Siewior 
Signed-off-by: Josh Boyer

powerpc: Convert old cpumask API into new one

2011-05-04T05:22:59+00:00

Adapt new API.

Almost change is trivial. Most important change is the below line
because we plan to change task->cpus_allowed implementation.

-       ctx->cpus_allowed = current->cpus_allowed;

Signed-off-by: KOSAKI Motohiro 
Signed-off-by: Benjamin Herrenschmidt

powerpc/kexec: make masking/disabling interrupts generic

2010-10-14T05:52:46+00:00

Right now just the kexec crash pathway turns turns off the interrupts.
Pull that out and make a generic version for use elsewhere

Signed-off-by: Matthew McClintock 
Signed-off-by: Kumar Gala

powerpc/kexec: Fix boundary case for book-e kexec memory limits

2010-07-22T18:31:14+00:00

The KEXEC_*_MEMORY_LIMITs are inclusive addresses.  We define them as
2Gs as that is what we allow mapping via TLBs.  However, this should be
2G - 1 to be inclusive, otherwise if we have >2G of memory in a system
we fail to boot properly via kexec.

Signed-off-by: Kumar Gala

powerpc/kexec: Add support for FSL-BookE

2010-05-25T02:25:32+00:00

This adds support kexec on FSL-BookE where the MMU can not be simply
switched off. The code borrows the initial MMU-setup code to create the
identical mapping mapping. The only difference to the original boot code
is the size of the mapping(s) and the executeable address.
The kexec code maps the first 2 GiB of memory in 256 MiB steps. This
should work also on e500v1 boxes.
SMP support is still not available.

(Kumar: Added minor change to build to ifdef CONFIG_PPC_STD_MMU_64 some
code that was PPC64 specific)

Signed-off-by: Sebastian Andrzej Siewior 
Signed-off-by: Kumar Gala

powerpc/kexec: Fix race in kexec shutdown

2010-05-21T07:31:11+00:00

In kexec_prepare_cpus, the primary CPU IPIs the secondary CPUs to
kexec_smp_down().  kexec_smp_down() calls kexec_smp_wait() which sets
the hw_cpu_id() to -1.  The primary does this while leaving IRQs on
which means the primary can take a timer interrupt which can lead to
the IPIing one of the secondary CPUs (say, for a scheduler re-balance)
but since the secondary CPU now has a hw_cpu_id = -1, we IPI CPU
-1... Kaboom!

We are hitting this case regularly on POWER7 machines.

There is also a second race, where the primary will tear down the MMU
mappings before knowing the secondaries have entered real mode.

Also, the secondaries are clearing out any pending IPIs before
guaranteeing that no more will be received.

This changes kexec_prepare_cpus() so that we turn off IRQs in the
primary CPU much earlier.  It adds a paca flag to say that the
secondaries have entered the kexec_smp_down() IPI and turned off IRQs,
rather than overloading hw_cpu_id with -1.  This new paca flag is
again used to in indicate when the secondaries has entered real mode.

It also ensures that all CPUs have their IRQs off before we clear out
any pending IPI requests (in kexec_cpu_down()) to ensure there are no
trailing IPIs left unacknowledged.

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

powerpc/kdump: Use ppc_save_regs() in crash_setup_regs()

2009-01-08T05:25:17+00:00

The patch replaces internal registers dump implementation with
ppc_save_regs(). From now on PPC64 and PPC32 are using the same
code for crash_setup_regs().

NOTE: The old regs dump implementation was capturing SP (r1) directly
as is, so you could see crash_kexec() function on top of the back-trace.
But ppc_save_regs() goes up one stack frame, so you'll not see it
anymore, at the top-level you'll see who actually triggered the crash
dump instead.

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

powerpc/32/kdump: Implement crash_setup_regs() using ppc_save_regs()

2008-12-23T04:13:28+00:00

This replaces the dummy crash_setup_regs function with full-fledged
crash_setup_regs implementation.  On PPC32 we simply use the new
ppc_save_regs function to dump the registers.

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