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sgi-xpc: XPC fails to discover partitions with all nasids above 128

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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 <holt@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Robin@sgi.com 2010-11-24 12:56:59 -08:00 committed by Linus Torvalds
parent 112bc2e120
commit c22c7aeff6
1 changed files with 15 additions and 10 deletions
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25
drivers/misc/sgi-xp/xpc_partition.c
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@ -439,18 +439,23 @@ 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++) {