From: Robin@sgi.com Date: Wed, 24 Nov 2010 20:56:59 +0000 (-0800) Subject: sgi-xpc: XPC fails to discover partitions with all nasids above 128 X-Git-Tag: v2.6.33.8~368 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=998eaeb0802f35212659849de50ff0ae751f4ad7;p=karo-tx-linux.git sgi-xpc: XPC fails to discover partitions with all nasids above 128 commit c22c7aeff69796f46ae0fcec141538e28f50b24e upstream. UV hardware defines 256 memory protection regions versus the baseline 64 with increasing size for the SN2 ia64. This was overlooked when XPC was modified to accomodate both UV and SN2. Without this patch, a user could reconfigure their existing system and suddenly disable cross-partition communications with no indication of what has gone wrong. It also prevents larger configurations from using cross-partition communication. Signed-off-by: Robin Holt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/sgi-xp/xpc_partition.c b/drivers/misc/sgi-xp/xpc_partition.c index 9a6268c89fdd..2ac2fdad6a5b 100644 --- a/drivers/misc/sgi-xp/xpc_partition.c +++ b/drivers/misc/sgi-xp/xpc_partition.c @@ -438,18 +438,23 @@ xpc_discovery(void) * nodes that can comprise an access protection grouping. The access * protection is in regards to memory, IOI and IPI. */ - max_regions = 64; region_size = xp_region_size; - switch (region_size) { - case 128: - max_regions *= 2; - case 64: - max_regions *= 2; - case 32: - max_regions *= 2; - region_size = 16; - DBUG_ON(!is_shub2()); + if (is_uv()) + max_regions = 256; + else { + max_regions = 64; + + switch (region_size) { + case 128: + max_regions *= 2; + case 64: + max_regions *= 2; + case 32: + max_regions *= 2; + region_size = 16; + DBUG_ON(!is_shub2()); + } } for (region = 0; region < max_regions; region++) {