kernel.git/arch/powerpc/platforms/pseries, 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: 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/pci: Properly allocate bus resources for hotplug PHBs

2008-10-31T05:12:03Z

Resources for PHB's that are dynamically added to a system are not properly allocated in the resource tree. Not having these resources allocated causes an oops when removing the PHB when we try to release them. The diff appears a bit messy, this is mainly due to moving everything one tab to the left in the pcibios_allocate_bus_resources routine. The functionality change in this routine is only that the list_for_each_entry() loop is pulled out and moved to the necessary calling routine. Signed-off-by: Nathan Fontenot Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras

powerpc: Use is_kdump_kernel()

2008-10-31T05:11:47Z

linux/crash_dump.h defines is_kdump_kernel() to be used by code that needs to know if the previous kernel crashed instead of a (clean) boot or reboot. This updates the just added powerpc code to use it. This is needed for the next commit, which will remove __kdump_flag. Signed-off-by: Milton Miller Signed-off-by: Paul Mackerras

powerpc: Support for relocatable kdump kernel

2008-10-22T04:01:22Z

This adds relocatable kernel support for kdump. With this one can use the same regular kernel to capture the kdump. A signature (0xfeed1234) is passed in r6 from panic code to the next kernel through kexec_sequence and purgatory code. The signature is used to differentiate between kdump kernel and non-kdump kernels. The purgatory code compares the signature and sets the __kdump_flag in head_64.S. During the boot up, kernel code checks __kdump_flag and if it is set, the kernel will behave as relocatable kdump kernel. This kernel will boot at the address where it was loaded by kexec-tools ie. at the address reserved through crashkernel boot parameter. CONFIG_CRASH_DUMP depends on CONFIG_RELOCATABLE option to build kdump kernel as relocatable. So the same kernel can be used as production and kdump kernel. This patch incorporates the changes suggested by Paul Mackerras to avoid GOT use and to avoid two copies of the code. Signed-off-by: Paul Mackerras Signed-off-by: Mohan Kumar M Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt

powerpc: Use cpu_thread_in_core in smp_init for of_spin_map

2008-10-21T04:19:12Z

We used to assume that even numbered threads were the primary threads, ie those that would be listed and started as a cpu from open firmware. Replace a left over is even (% 2) check with a check for it being a primary thread and update the comments. Tested with a debug print on pseries, identical code found for cell. Signed-off-by: Milton Miller Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Validate PFN in pseries_remove_lmb()

2008-10-21T04:17:47Z

The pfn of the memory to be removed should be validated prior to attempting to remove the memory. In cases where the probe of a memory section fails during hotplug add, the pfn for the lmb may not be valid. Signed-off-by: Badari Pulavarty Signed-off-by: Nathan Fontenot Signed-off-by: Benjamin Herrenschmidt

Merge commit 'origin'

2008-10-15T00:31:54Z

Manual fixup of conflicts on: arch/powerpc/include/asm/dcr-regs.h drivers/net/ibm_newemac/core.h

powerpc/xics: Reduce and comment xics IPI use of memory barriers

2008-10-13T05:24:19Z

A single full sync (mb()) is requrired to order the mmio to the qirr reg with the set or clear of the message word. However, test_and_clear_bit has the effect of smp_mb() and we are not doing any other io from here, so we don't need a mb per bit processed. Signed-off-by: Milton Miller Signed-off-by: Benjamin Herrenschmidt

powerpc/xics: Make printk format strings fit on one line

2008-10-13T05:24:19Z

Several printks were broken at word boundaries for line length. Some even referred to old function names. Using __func__ and changing the text slightly for the format allows these printk formats to fit on one line. Signed-off-by: Milton Miller Signed-off-by: Benjamin Herrenschmidt