kernel.git/arch/powerpc/kernel/crash.c, branch linux-2.6.37.y

powerpc/kexec: make masking/disabling interrupts generic

2010-10-14T05:52:46Z

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/kdump: Stop all other CPUs before running crash handlers

2010-08-24T05:26:27Z

During kdump we run the crash handlers first then stop all other CPUs. We really want to stop all CPUs as close to the fail as possible and also have a very controlled environment for running the crash handlers, so it makes sense to reverse the order. Signed-off-by: Anton Blanchard Acked-by: Matt Evans Signed-off-by: Benjamin Herrenschmidt

lmb: rename to memblock

2010-07-14T07:14:00Z

via following scripts FILES=$(find * -type f | grep -vE 'oprofile|[^K]config') sed -i \ -e 's/lmb/memblock/g' \ -e 's/LMB/MEMBLOCK/g' \ $FILES for N in $(find . -name lmb.[ch]); do M=$(echo $N | sed 's/lmb/memblock/g') mv $N $M done and remove some wrong change like lmbench and dlmb etc. also move memblock.c from lib/ to mm/ Suggested-by: Ingo Molnar Acked-by: "H. Peter Anvin" Acked-by: Benjamin Herrenschmidt Acked-by: Linus Torvalds Signed-off-by: Yinghai Lu Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix default_machine_crash_shutdown #ifdef botch

2010-07-08T08:11:45Z

crash_kexec_wait_realmode() is defined only if CONFIG_PPC_STD_MMU_64 and CONFIG_SMP, but is called if CONFIG_PPC_STD_MMU_64 even if !CONFIG_SMP. Fix the conditional compilation around the invocation. Signed-off-by: Paul E. McKenney Acked-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt

powerpc/kexec: Add support for FSL-BookE

2010-05-25T02:25:32Z

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/kdump: Fix race in kdump shutdown

2010-05-21T07:31:11Z

When we are crashing, the crashing/primary CPU IPIs the secondaries to turn off IRQs, go into real mode and wait in kexec_wait. While this is happening, the primary tears down all the MMU maps. Unfortunately the primary doesn't check to make sure the secondaries have entered real mode before doing this. On PHYP machines, the secondaries can take a long time shutting down the IRQ controller as RTAS calls are need. These RTAS calls need to be serialised which resilts in the secondaries contending in lock_rtas() and hence taking a long time to shut down. We've hit this on large POWER7 machines, where some secondaries are still waiting in lock_rtas(), when the primary tears down the HPTEs. This patch makes sure all secondaries are in real mode before the primary tears down the MMU. It uses the new kexec_state entry in the paca. It times out if the secondaries don't reach real mode after 10sec. Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt

powerpc/kdump: Use chip->shutdown to disable IRQs

2010-05-21T07:31:10Z

I saw this in a kdump kernel: IOMMU table initialized, virtual merging enabled Interrupt 155954 (real) is invalid, disabling it. Interrupt 155953 (real) is invalid, disabling it. ie we took some spurious interrupts. default_machine_crash_shutdown tries to disable all interrupt sources but uses chip->disable which maps to the default action of: static void default_disable(unsigned int irq) { } If we use chip->shutdown, then we actually mask the IRQ: static void default_shutdown(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); desc->chip->mask(irq); desc->status |= IRQ_MASKED; } Not sure why we don't implement a ->disable action for xics.c, or why default_disable doesn't mask the interrupt. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

powerpc/kdump: CPUs assume the context of the oopsing CPU

2010-05-21T07:31:10Z

We wrap the crash_shutdown_handles[] calls with longjmp/setjmp, so if any of them fault we can recover. The problem is we add a hook to the debugger fault handler hook which calls longjmp unconditionally. This first part of kdump is run before we marshall the other CPUs, so there is a very good chance some CPU on the box is going to page fault. And when it does it hits the longjmp code and assumes the context of the oopsing CPU. The machine gets very confused when it has 10 CPUs all with the same stack, all thinking they have the same CPU id. I get even more confused trying to debug it. The patch below adds crash_shutdown_cpu and uses it to specify which cpu is in the protected region. Since it can only be -1 or the oopsing CPU, we don't need to use memory barriers since it is only valid on the local CPU - no other CPU will ever see a value that matches it's local CPU id. Eventually we should switch the order and marshall all CPUs before doing the crash_shutdown_handles[] calls, but that is a bigger fix. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

powerpc/crashdump: Do not fail on NULL pointer dereferencing

2010-05-21T07:31:09Z

Signed-off-by: Maxim Uvarov Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove get_irq_desc()

2009-10-30T06:20:55Z

get_irq_desc() is a powerpc-specific version of irq_to_desc(). That is reason enough to remove it, but it also doesn't know about sparse irq_desc support which irq_to_desc() does (when we enable it). Signed-off-by: Michael Ellerman Acked-by: Grant Likely Signed-off-by: Benjamin Herrenschmidt