kernel.git/arch/powerpc/platforms, branch linux-2.6.28.y

powerpc: Disable Collaborative Memory Manager for kdump

2009-01-18T18:44:05Z

commit 2218108e182fd8a6d9106077833ed7ad05fc8e75 upstream. When running Active Memory Sharing, the Collaborative Memory Manager (CMM) may mark some pages as "loaned" with the hypervisor. Periodically, the CMM will query the hypervisor for a loan request, which is a single signed value. When kexec'ing into a kdump kernel, the CMM driver in the kdump kernel is not aware of the pages the previous kernel had marked as "loaned", so the hypervisor and the CMM driver are out of sync. This results in the CMM driver getting a negative loan request, which can then get treated as a large unsigned value and can cause kdump to hang due to the CMM driver inflating too large. Since there really is no clean way for the CMM driver in the kdump kernel to clean this up, simply disable CMM in the kdump kernel. This fixes hangs we were seeing doing kdump with AMS. Signed-off-by: Brian King Signed-off-by: Paul Mackerras Signed-off-by: Greg Kroah-Hartman

powerpc/cell/axon-msi: Fix MSI after kexec

2008-12-16T02:48:18Z

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 Signed-off-by: Arnd Bergmann Acked-by: Michael Ellerman Signed-off-by: Paul Mackerras

powerpc/cell: Fix GDB watchpoints, again

2008-11-30T22:40:18Z

An earlier patch from Jens Osterkamp attempted to fix GDB watchpoints by enabling the DABRX register at boot time. Unfortunately, this did not work on SMP setups, where secondary CPUs were still using the power-on DABRX value. This introduces the same change for secondary CPUs on cell as well. Reported-by: Ulrich Weigand Tested-by: Ulrich Weigand Signed-off-by: Arnd Bergmann Signed-off-by: Paul Mackerras

powerpc/cell/axon-msi: Retry on missing interrupt

2008-11-30T22:40:18Z

The MSI capture logic for the axon bridge can sometimes lose interrupts in case of high DMA and interrupt load, when it signals an MSI interrupt to the MPIC interrupt controller while we are already handling another MSI. Each MSI vector gets written into a FIFO buffer in main memory using DMA, and that DMA access is normally flushed by the actual interrupt packet on the IOIF. An MMIO register in the MSIC holds the position of the last entry in the FIFO buffer that was written. However, reading that position does not flush the DMA, so that we can observe stale data in the buffer. In a stress test, we have observed the DMA to arrive up to 14 microseconds after reading the register. This patch works around this problem by retrying the access to the FIFO buffer. We can reliably detect the conditioning by writing an invalid MSI vector into the FIFO buffer after reading from it, assuming that all MSIs we get are valid. After detecting an invalid MSI vector, we udelay(1) in the interrupt cascade for up to 100 times before giving up. Signed-off-by: Arnd Bergmann Signed-off-by: Paul Mackerras

Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jk/spufs into merge

2008-11-24T00:54:08Z

powerpc/spufs: Fix spinning in spufs_ps_fault on signal

2008-11-20T23:14:16Z

Currently, we can end up in an infinite loop if we get a signal while the kernel has faulted in spufs_ps_fault. Eg: alarm(1); write(fd, some_spu_psmap_register_address, 4); - the write's copy_from_user will fault on the ps mapping, and signal_pending will be non-zero. Because returning from the fault handler will never clear TIF_SIGPENDING, so we'll just keep faulting, resulting in an unkillable process using 100% of CPU. This change returns VM_FAULT_SIGBUS if there's a fatal signal pending, letting us escape the loop. Signed-off-by: Jeremy Kerr

powerpc: Fix "unused variable" warning in pci_dlpar.c

2008-11-05T08:59:08Z

This gets rid of this build warning: arch/powerpc/platforms/pseries/pci_dlpar.c: In function 'init_phb_dynamic': arch/powerpc/platforms/pseries/pci_dlpar.c:192: warning: unused variable 'b' This is one of the very few warnings left in a ppc64_defconfig build and getting rid of it will make it easier to see future introduced ones (in fact this was introduced very recently). Signed-off-by: Stephen Rothwell Signed-off-by: Paul Mackerras

powerpc/cell: Fix compile error in ras.c

2008-11-05T08:59:08Z

This fixes this error on Cell when CONFIG_KEXEC = n: arch/powerpc/platforms/cell/ras.c:299: error: implicit declaration of function 'crash_shutdown_register' We have to include because it contains the dummy definition of crash_shutdown_register that is used when CONFIG_KEXEC=n, but doesn't include in that case. Signed-off-by: Alexey Dobriyan Signed-off-by: Paul Mackerras

Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

2008-10-31T15:14:15Z

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (23 commits) Revert "powerpc: Sync RPA note in zImage with kernel's RPA note" powerpc: Fix compile errors with CONFIG_BUG=n powerpc: Fix format string warning in arch/powerpc/boot/main.c powerpc: Fix bug in kernel copy of libfdt's fdt_subnode_offset_namelen() powerpc: Remove duplicate DMA entry from mpc8313erdb device tree powerpc/cell/OProfile: Fix on-stack array size in activate spu profiling function powerpc/mpic: Fix regression caused by change of default IRQ affinity powerpc: Update remaining dma_mapping_ops to use map/unmap_page powerpc/pci: Fix unmapping of IO space on 64-bit powerpc/pci: Properly allocate bus resources for hotplug PHBs OF-device: Don't overwrite numa_node in device registration powerpc: Fix swapcontext system for VSX + old ucontext size powerpc: Fix compiler warning for the relocatable kernel powerpc: Work around ld bug in older binutils powerpc/ppc64/kdump: Better flag for running relocatable powerpc: Use is_kdump_kernel() powerpc: Kexec exit should not use magic numbers powerpc/44x: Update 44x defconfigs powerpc/40x: Update 40x defconfigs powerpc: enable heap randomization for linkstations ...

powerpc/mpic: Fix regression caused by change of default IRQ affinity

2008-10-31T05:13:50Z

The Freescale implementation of MPIC only allows a single CPU destination for non-IPI interrupts. We add a flag to the mpic_init to distinquish these variants of MPIC. We pull in the irq_choose_cpu from sparc64 to select a single CPU as the destination of the interrupt. This is to deal with the fact that the default smp affinity was changed by commit 18404756765c713a0be4eb1082920c04822ce588 ("genirq: Expose default irq affinity mask (take 3)") to be all CPUs. Signed-off-by: Kumar Gala Signed-off-by: Paul Mackerras