kernel.git/arch/powerpc/platforms, branch linux-2.6.34.y

powerpc: pseries: Fix kexec on machines with more than 4TB of RAM

2012-05-17T15:21:29Z

commit bed9a31527af8ff3dfbad62a1a42815cef4baab7 upstream. On a box with 8TB of RAM the MMU hashtable is 64GB in size. That means we have 4G PTEs. pSeries_lpar_hptab_clear was using a signed int to store the index which will overflow at 2G. Signed-off-by: Anton Blanchard Acked-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Gortmaker

powerpc/pseries/hvconsole: Fix dropped console output

2012-05-17T15:21:22Z

commit 51d33021425e1f905beb4208823146f2fb6517da upstream. Return -EAGAIN when we get H_BUSY back from the hypervisor. This makes the hvc console driver retry, avoiding dropped printks. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Gortmaker

powerpc/kexec: Speedup kexec hash PTE tear down

2011-06-26T16:46:58Z

commit d504bed676caad29a3dba3d3727298c560628f5c upstream. Currently for kexec the PTE tear down on 1TB segment systems normally requires 3 hcalls for each PTE removal. On a machine with 32GB of memory it can take around a minute to remove all the PTEs. This optimises the path so that we only remove PTEs that are valid. It also uses the read 4 PTEs at once HCALL. For the common case where a PTEs is invalid in a 1TB segment, this turns the 3 HCALLs per PTE down to 1 HCALL per 4 PTEs. This gives an > 10x speedup in kexec times on PHYP, taking a 32GB machine from around 1 minute down to a few seconds. Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Gortmaker

powerpc/pseries: Add hcall to read 4 ptes at a time in real mode

2011-06-26T16:46:58Z

commit f90ece28c1f5b3ec13fe481406857fe92f4bc7d1 upstream. This adds plpar_pte_read_4_raw() which can be used read 4 PTEs from PHYP at a time, while in real mode. It also creates a new hcall9 which can be used in real mode. It's the same as plpar_hcall9 but minus the tracing hcall statistics which may require variables outside the RMO. Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Gortmaker

powerpc/pseries: Make query_cpu_stopped callable outside hotplug cpu

2010-07-05T18:22:20Z

commit f8b67691828321f5c85bb853283aa101ae673130 upstream. This moves query_cpu_stopped() out of the hotplug cpu code and into smp.c so it can called in other places and renames it to smp_query_cpu_stopped(). It also cleans up the return values by adding some #defines Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Greg Kroah-Hartman

powerpc/pseries: Only call start-cpu when a CPU is stopped

2010-07-05T18:22:19Z

commit aef40e87d866355ffd279ab21021de733242d0d5 upstream. Currently we always call start-cpu irrespective of if the CPU is stopped or not. Unfortunatley on POWER7, firmware seems to not like start-cpu being called when a cpu already been started. This was not the case on POWER6 and earlier. This patch checks to see if the CPU is stopped or not via an query-cpu-stopped-state call, and only calls start-cpu on CPUs which are stopped. This fixes a bug with kexec on POWER7 on PHYP where only the primary thread would make it to the second kernel. Reported-by: Ankita Garg Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Greg Kroah-Hartman

powerpc/pseries: Flush lazy kernel mappings after unplug operations

2010-04-28T06:23:24Z

This ensures that the translations for unmapped IO mappings or unmapped memory are properly removed from the MMU hash table before such an unplug. Without this, the hypervisor refuses the unplug operations due to those resources still being mapped by the partition. Signed-off-by: Benjamin Herrenschmidt

powerpc/85xx/86xx: Fix build w/ CONFIG_PCI=n

2010-04-20T04:12:21Z

Currently some MPC85xx and MPC86xx boards fail to build without CONFIG_PCI: arch/powerpc/platforms/fsl_uli1575.c: In function 'quirk_final_uli5249': arch/powerpc/platforms/fsl_uli1575.c:234: error: implicit declaration of function 'pci_bus_for_each_resource' arch/powerpc/platforms/fsl_uli1575.c:234: error: expected ';' before '{' token cc1: warnings being treated as errors arch/powerpc/platforms/fsl_uli1575.c:223: warning: unused variable 'dummy' make[1]: *** [arch/powerpc/platforms/fsl_uli1575.o] Error 1 This patch fixes the issue by appending 'if PCI' condition when selecting FSL_ULI1575 Kconfig symbol. Signed-off-by: Anton Vorontsov Signed-off-by: Kumar Gala

Merge branch 'master' into export-slabh

2010-04-05T02:37:28Z

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30T13:02:32Z

percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo Guess-its-ok-by: Christoph Lameter Cc: Ingo Molnar Cc: Lee Schermerhorn