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authorJesse Larrew <jlarrew@linux.vnet.ibm.com>2013-04-24 10:00:35 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-04-26 10:08:23 +0400
commit5d88aa85c00bb4026dd986430dc496effc637d42 (patch)
tree206edc195104eb8258a36b25f5247055211164c2 /arch/powerpc/include/asm/firmware.h
parent8002b0c54b16931ad71771e6c97e46aca1be4456 (diff)
downloadlinux-5d88aa85c00bb4026dd986430dc496effc637d42.tar.xz
powerpc/pseries: Update CPU maps when device tree is updated
Platform events such as partition migration or the new PRRN firmware feature can cause the NUMA characteristics of a CPU to change, and these changes will be reflected in the device tree nodes for the affected CPUs. This patch registers a handler for Open Firmware device tree updates and reconfigures the CPU and node maps whenever the associativity changes. Currently, this is accomplished by marking the affected CPUs in the cpu_associativity_changes_mask and allowing arch_update_cpu_topology() to retrieve the new associativity information using hcall_vphn(). Protecting the NUMA cpu maps from concurrent access during an update operation will be addressed in a subsequent patch in this series. Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/firmware.h')
-rw-r--r--arch/powerpc/include/asm/firmware.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/firmware.h b/arch/powerpc/include/asm/firmware.h
index 6e336e0978b1..0df54646f968 100644
--- a/arch/powerpc/include/asm/firmware.h
+++ b/arch/powerpc/include/asm/firmware.h
@@ -51,6 +51,7 @@
#define FW_FEATURE_SET_MODE ASM_CONST(0x0000000040000000)
#define FW_FEATURE_BEST_ENERGY ASM_CONST(0x0000000080000000)
#define FW_FEATURE_TYPE1_AFFINITY ASM_CONST(0x0000000100000000)
+#define FW_FEATURE_PRRN ASM_CONST(0x0000000200000000)
#ifndef __ASSEMBLY__
@@ -66,7 +67,7 @@ enum {
FW_FEATURE_MULTITCE | FW_FEATURE_SPLPAR | FW_FEATURE_LPAR |
FW_FEATURE_CMO | FW_FEATURE_VPHN | FW_FEATURE_XCMO |
FW_FEATURE_SET_MODE | FW_FEATURE_BEST_ENERGY |
- FW_FEATURE_TYPE1_AFFINITY,
+ FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN,
FW_FEATURE_PSERIES_ALWAYS = 0,
FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL | FW_FEATURE_OPALv2,
FW_FEATURE_POWERNV_ALWAYS = 0,