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linux/arch/powerpc/platforms/cell
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Arnd Bergmann 23e0e8afaf powerpc/cell/axon-msi: Fix MSI after kexec 
Commit d015fe995 'powerpc/cell/axon-msi: Retry on missing interrupt'
has turned a rare failure to kexec on QS22 into a reproducible
error, which we have now analysed.

The problem is that after a kexec, the MSIC hardware still points
into the middle of the old ring buffer.  We set up the ring buffer
during reboot, but not the offset into it.  On older kernels, this
would cause a storm of thousands of spurious interrupts after a
kexec, which would most of the time get dropped silently.

With the new code, we time out on each interrupt, waiting for
it to become valid.  If more interrupts come in that we time
out on, this goes on indefinitely, which eventually leads to
a hard crash.

The solution in this commit is to read the current offset from
the MSIC when reinitializing it.  This now works correctly, as
expected.

Reported-by: Dirk Herrendoerfer <d.herrendoerfer@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
 		2008-12-16 13:48:18 +11:00
..
spufs Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jk/spufs into merge 2008-11-24 11:54:08 +11:00
Kconfig powerpc/cell: Add support for power button of future IBM cell blades 2008-07-22 10:39:32 +10:00
Makefile powerpc/cell: Add support for power button of future IBM cell blades 2008-07-22 10:39:32 +10:00
axon_msi.c powerpc/cell/axon-msi: Fix MSI after kexec 2008-12-16 13:48:18 +11:00
beat.c [POWERPC] celleb: Move miscellaneous files for Beat 2008-04-24 21:08:14 +10:00
beat.h [POWERPC] celleb: Move miscellaneous files for Beat 2008-04-24 21:08:14 +10:00
beat_htab.c powerpc: Remove unnecessary condition when sanity-checking WIMG bits 2008-07-15 12:24:59 +10:00
beat_hvCall.S [POWERPC] celleb: Move files for Beat hvcall interfaces 2008-04-24 21:08:13 +10:00
beat_interrupt.c [POWERPC] celleb: Move miscellaneous files for Beat 2008-04-24 21:08:14 +10:00
beat_interrupt.h [POWERPC] celleb: Move miscellaneous files for Beat 2008-04-24 21:08:14 +10:00
beat_iommu.c [POWERPC] celleb: Move files for Beat mmu and iommu 2008-04-24 21:08:13 +10:00
beat_smp.c [POWERPC] celleb: Move miscellaneous files for Beat 2008-04-24 21:08:14 +10:00
beat_spu_priv1.c [POWERPC] celleb: Move a file for SPU on Beat 2008-04-24 21:08:13 +10:00
beat_syscall.h [POWERPC] celleb: Move files for Beat hvcall interfaces 2008-04-24 21:08:13 +10:00
beat_udbg.c [POWERPC] celleb: Move miscellaneous files for Beat 2008-04-24 21:08:14 +10:00
beat_wrapper.h [POWERPC] celleb: Move files for Beat hvcall interfaces 2008-04-24 21:08:13 +10:00
cbe_cpufreq.c [POWERPC] cell: Convert #include of asm/of_{platform, device}.h into linux/of_{platform, device}.h. 2007-12-19 01:00:02 +01:00
cbe_cpufreq.h [CELL] cbe_cpufreq: reorganize code 2007-07-20 21:41:38 +02:00
cbe_cpufreq_pervasive.c [POWERPC] cell: Move cbe_regs.h to include/asm-powerpc/cell-regs.h 2007-10-09 21:01:56 +10:00
cbe_cpufreq_pmi.c cpufreq acpi: only call _PPC after cpufreq ACPI init funcs got called already 2008-07-30 09:41:43 -07:00
cbe_powerbutton.c powerpc/cell: Add support for power button of future IBM cell blades 2008-07-22 10:39:32 +10:00
cbe_regs.c [POWERPC] cell/cbe_regs.c: Add missing of_node_put 2007-12-20 17:13:51 +11:00
cbe_thermal.c sysdev: Pass the attribute to the low level sysdev show/store function 2008-07-21 21:55:02 -07:00
celleb_pci.c [POWERPC] celleb: Add support for PCI Express 2008-04-24 21:08:14 +10:00
celleb_pci.h [POWERPC] celleb: Add support for PCI Express 2008-04-24 21:08:14 +10:00
celleb_scc.h [POWERPC] celleb: Add support for PCI Express 2008-04-24 21:08:14 +10:00
celleb_scc_epci.c [POWERPC] celleb: Move the SCC related code for celleb 2008-04-24 21:08:13 +10:00
celleb_scc_pciex.c dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
celleb_scc_sio.c [POWERPC] celleb: Move the SCC related code for celleb 2008-04-24 21:08:13 +10:00
celleb_scc_uhc.c [POWERPC] celleb: Move the SCC related code for celleb 2008-04-24 21:08:13 +10:00
celleb_setup.c [POWERPC] celleb: Move miscellaneous files for Beat 2008-04-24 21:08:14 +10:00
cpufreq_spudemand.c powerpc/cell/cpufreq: Add spu aware cpufreq governor 2008-07-22 10:39:31 +10:00
interrupt.c powerpc: convert to generic helpers for IPI function calls 2008-06-26 11:22:13 +02:00
interrupt.h [POWERPC] cell: Add routines for managing PMU interrupts 2006-12-04 20:40:12 +11:00
io-workarounds.c [POWERPC] cell: Fix section mismatches in io-workarounds code 2008-05-15 20:49:57 +10:00
io-workarounds.h [POWERPC] cell: Fix section mismatches in io-workarounds code 2008-05-15 20:49:57 +10:00
iommu.c powerpc: Update remaining dma_mapping_ops to use map/unmap_page 2008-10-31 16:13:48 +11:00
pervasive.c powerpc/cell: Cleanup sysreset_hack for IBM cell blades 2008-07-22 10:39:31 +10:00
pervasive.h powerpc/cell: Cleanup sysreset_hack for IBM cell blades 2008-07-22 10:39:31 +10:00
pmu.c [POWERPC] cell: Use machine_*_initcall() hooks in platform code 2008-01-17 14:57:15 +11:00
ras.c powerpc/cell: Fix compile error in ras.c 2008-11-05 19:59:08 +11:00
ras.h [POWERPC] cell: add RAS support 2006-06-21 15:01:29 +10:00
setup.c [POWERPC] cell: Generalize io-workarounds code 2008-04-24 21:08:12 +10:00
smp.c powerpc/cell: Fix GDB watchpoints, again 2008-12-01 09:40:18 +11:00
spider-pci.c dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
spider-pic.c powerpc: Fix irq_alloc_host() reference counting and callers 2008-06-09 13:51:16 +10:00
spu_base.c sysdev: Pass the attribute to the low level sysdev show/store function 2008-07-21 21:55:02 -07:00
spu_callbacks.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
spu_fault.c [POWERPC] spufs: move fault, lscsa_alloc and switch code to spufs module 2007-12-21 19:46:19 +11:00
spu_manage.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
spu_notify.c [POWERPC] Oprofile: Remove dependency on spufs module 2007-12-28 15:07:52 +11:00
spu_priv1_mmio.c [POWERPC] spufs: try to route SPU interrupts to local node 2008-05-05 13:33:43 +10:00
spu_priv1_mmio.h [POWERPC] cell: abstract spu management routines 2006-12-04 20:40:39 +11:00
spu_syscalls.c [POWERPC] Oprofile: Remove dependency on spufs module 2007-12-28 15:07:52 +11:00