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Subject[PATCH 7/7] Enable multiple memory sections per sysfs memory directory for powerpc/pseries
This patch updates the powerpc/pseries code to initialize
the memory sysfs directory creation to create sysfs directories
that each cover an LMB's worth of memory.

Signed-off-by; Nathan Fontenot <nfont@austin.ibm.ocm>
---
arch/powerpc/platforms/pseries/hotplug-memory.c | 66 +++++++++++++++++++-----
1 file changed, 53 insertions(+), 13 deletions(-)
Index: linux-2.6/arch/powerpc/platforms/pseries/hotplug-memory.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/pseries/hotplug-memory.c 2010-07-09 14:36:52.000000000 -0500
+++ linux-2.6/arch/powerpc/platforms/pseries/hotplug-memory.c 2010-07-09 14:38:25.000000000 -0500
@@ -17,6 +17,54 @@
#include <asm/pSeries_reconfig.h>
#include <asm/sparsemem.h>

+static u32 get_lmb_size(void)
+{
+ struct device_node *np;
+ unsigned int lmb_size = 0;
+
+ np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
+ if (np) {
+ const unsigned int *size;
+
+ size = of_get_property(np, "ibm,lmb-size", NULL);
+ lmb_size = size ? *size : 0;
+
+ of_node_put(np);
+ } else {
+ const unsigned int *regs;
+
+ np = of_find_node_by_path("/memory@0");
+ if (np) {
+ regs = of_get_property(np, "reg", NULL);
+ lmb_size = regs ? regs[3] : 0;
+ of_node_put(np);
+ }
+
+ if (lmb_size) {
+ /* We now know the size of memory@0, use this to find
+ * the first lmb and get its size.
+ */
+ char buf[64];
+
+ sprintf(buf, "/memory@%x", lmb_size);
+ np = of_find_node_by_path(buf);
+ if (np) {
+ regs = of_get_property(np, "reg", NULL);
+ lmb_size = regs ? regs[3] : 0;
+ of_node_put(np);
+ } else
+ lmb_size = 0;
+ }
+ }
+
+ return lmb_size;
+}
+
+u32 memory_block_size(void)
+{
+ return get_lmb_size();
+}
+
static int pseries_remove_lmb(unsigned long base, unsigned int lmb_size)
{
unsigned long start, start_pfn;
@@ -127,30 +175,22 @@

static int pseries_drconf_memory(unsigned long *base, unsigned int action)
{
- struct device_node *np;
- const unsigned long *lmb_size;
+ unsigned long lmb_size;
int rc;

- np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
- if (!np)
+ lmb_size = get_lmb_size();
+ if (!lmb_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 = lmb_add(*base, *lmb_size);
+ rc = lmb_add(*base, lmb_size);
rc = (rc < 0) ? -EINVAL : 0;
} else if (action == PSERIES_DRCONF_MEM_REMOVE) {
- rc = pseries_remove_lmb(*base, *lmb_size);
+ rc = pseries_remove_lmb(*base, lmb_size);
} else {
rc = -EINVAL;
}

- of_node_put(np);
return rc;
}

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