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authorCliff Wickman <cpw@sgi.com>2011-05-10 08:26:43 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-21 15:13:32 -0700
commit9af9f92080401b2f68e88ef2df266f2eaeca73e0 (patch)
tree20630c353d14524e52acd2efc162391ca173f6a6 /usr/initramfs_data.S
parent9e7b09d09931b8ef2d1e46335bc41eff5ff0d23a (diff)
downloadlinux-linaro-android-9af9f92080401b2f68e88ef2df266f2eaeca73e0.tar.gz
x86: Fix UV BAU for non-consecutive nasids
commit 77ed23f8d995a01cd8101d84351b567bf5177a30 upstream. This is a fix for the SGI Altix-UV Broadcast Assist Unit code, which is used for TLB flushing. Certain hardware configurations (that customers are ordering) cause nasids (numa address space id's) to be non-consecutive. Specifically, once you have more than 4 blades in a IRU (Individual Rack Unit - or 1/2 rack) but less than the maximum of 16, the nasid numbering becomes non-consecutive. This currently results in a 'catastrophic error' (CATERR) detected by the firmware during OS boot. The BAU is generating an 'INTD' request that is targeting a non-existent nasid value. Such configurations may also occur when a blade is configured off because of hardware errors. (There is one UV hub per blade.) This patch is required to support such configurations. The problem with the tlb_uv.c code is that is using the consecutive hub numbers as indices to the BAU distribution bit map. These are simply the ordinal position of the hub or blade within its partition. It should be using physical node numbers (pnodes), which correspond to the physical nasid values. Use of the hub number only works as long as the nasids in the partition are consecutive and increase with a stride of 1. This patch changes the index to be the pnode number, thus allowing nasids to be non-consecutive. It also provides a table in local memory for each cpu to translate target cpu number to target pnode and nasid. And it improves naming to properly reflect 'node' and 'uvhub' versus 'nasid'. Signed-off-by: Cliff Wickman <cpw@sgi.com> Link: http://lkml.kernel.org/r/E1QJmxX-0002Mz-Fk@eag09.americas.sgi.com Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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