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powerpc/pseries: Poll VPA for topology changes and update NUMA maps

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This patch sets a timer during boot that will periodically poll the
associativity change counters in the VPA. When a change in
associativity is detected, it retrieves the new associativity domain
information via the H_HOME_NODE_ASSOCIATIVITY hcall and updates the
NUMA node maps and sysfs entries accordingly. Note that since the
ibm,associativity device tree property does not exist on configurations
with both NUMA and SPLPAR enabled, no device tree updates are necessary.

Signed-off-by: Jesse Larrew <jlarrew@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Jesse Larrew
2010-12-01 12:31:15 +00:00
committed by Benjamin Herrenschmidt
parent 4dfa9c4748
commit 9eff1a3840
2 changed files with 271 additions and 11 deletions
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5
arch/powerpc/include/asm/lppaca.h
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@@ -62,7 +62,10 @@ struct lppaca {
volatile u32 dyn_pir; // Dynamic ProcIdReg value x20-x23
u32 dsei_data; // DSEI data x24-x27
u64 sprg3; // SPRG3 value x28-x2F
u8 reserved3[80]; // Reserved x30-x7F
u8 reserved3[40]; // Reserved x30-x57
volatile u8 vphn_assoc_counts[8]; // Virtual processor home node
// associativity change counters x58-x5F
u8 reserved4[32]; // Reserved x60-x7F
//=============================================================================
// CACHE_LINE_2 0x0080 - 0x00FF Contains local read-write data