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authorSonny Rao <sonnyrao@linux.vnet.ibm.com>2008-07-08 15:45:11 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-15 12:24:55 +1000
commitfe9e8d53772b5ea9ccf8ea4e8f0f009a6885eb70 (patch)
treedad2ae7dfd7726794dd6eb3444bf0c99e582c50c /drivers/char/Kconfig
parentb3fcaaa8a6359e9ed623ed4c1d2d48c79eed4648 (diff)
powerpc: Add driver for Barrier Synchronization Register
Adds a character driver for BSR support on IBM POWER systems including Power5 and Power6. The BSR is an optional processor facility not currently implemented by any other processors. It's primary purpose is fast large SMP synchronization. More details on the BSR are in comments to the code which follows. This patch adds BSR driver to pseries_defconfig. Signed-off-by: Sonny Rao <sonnyrao@linux.vnet.ibm.com> Signed-off-by: Joel Schopp <jschopp@austin.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/char/Kconfig')
-rw-r--r--drivers/char/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 2d854bb9373e..650e6b44ce65 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -649,6 +649,14 @@ config HVCS
which will also be compiled when this driver is built as a
module.
+config IBM_BSR
+ tristate "IBM POWER Barrier Synchronization Register support"
+ depends on PPC_PSERIES
+ help
+ This devices exposes a hardware mechanism for fast synchronization
+ of threads across a large system which avoids bouncing a cacheline
+ between several cores on a system
+
source "drivers/char/ipmi/Kconfig"
config DS1620