From c540ada2625caabd2dc4dc1e4740bc28765f1b4f Mon Sep 17 00:00:00 2001 From: Nathan Fontenot Date: Thu, 20 Jan 2011 10:45:20 -0600 Subject: [PATCH] memory hotplug: Define memory_block_size_bytes for powerpc/pseries Define a version of memory_block_size_bytes() for powerpc/pseries such that a memory block spans an entire lmb. Signed-off-by: Nathan Fontenot Reviewed-by: Robin Holt Signed-off-by: Greg Kroah-Hartman --- .../platforms/pseries/hotplug-memory.c | 66 +++++++++++++++---- 1 file changed, 53 insertions(+), 13 deletions(-) diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index bc8803664140..33867ec4a234 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -17,6 +17,54 @@ #include #include +static unsigned long get_memblock_size(void) +{ + struct device_node *np; + unsigned int memblock_size = 0; + + np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory"); + if (np) { + const unsigned long *size; + + size = of_get_property(np, "ibm,lmb-size", NULL); + memblock_size = size ? *size : 0; + + of_node_put(np); + } else { + unsigned int memzero_size = 0; + const unsigned int *regs; + + np = of_find_node_by_path("/memory@0"); + if (np) { + regs = of_get_property(np, "reg", NULL); + memzero_size = regs ? regs[3] : 0; + of_node_put(np); + } + + if (memzero_size) { + /* We now know the size of memory@0, use this to find + * the first memoryblock and get its size. + */ + char buf[64]; + + sprintf(buf, "/memory@%x", memzero_size); + np = of_find_node_by_path(buf); + if (np) { + regs = of_get_property(np, "reg", NULL); + memblock_size = regs ? regs[3] : 0; + of_node_put(np); + } + } + } + + return memblock_size; +} + +unsigned long memory_block_size_bytes(void) +{ + return get_memblock_size(); +} + static int pseries_remove_memblock(unsigned long base, unsigned int memblock_size) { unsigned long start, start_pfn; @@ -127,30 +175,22 @@ static int pseries_add_memory(struct device_node *np) static int pseries_drconf_memory(unsigned long *base, unsigned int action) { - struct device_node *np; - const unsigned long *lmb_size; + unsigned long memblock_size; int rc; - np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory"); - if (!np) + memblock_size = get_memblock_size(); + if (!memblock_size) return -EINVAL; - lmb_size = of_get_property(np, "ibm,lmb-size", NULL); - if (!lmb_size) { - of_node_put(np); - return -EINVAL; - } - if (action == PSERIES_DRCONF_MEM_ADD) { - rc = memblock_add(*base, *lmb_size); + rc = memblock_add(*base, memblock_size); rc = (rc < 0) ? -EINVAL : 0; } else if (action == PSERIES_DRCONF_MEM_REMOVE) { - rc = pseries_remove_memblock(*base, *lmb_size); + rc = pseries_remove_memblock(*base, memblock_size); } else { rc = -EINVAL; } - of_node_put(np); return rc; } -- 2.39.2