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Subject[PATCH 7/8] Add memory hot add/remove notifier handlers for pwoerpc
Add memory hot add/remove notifier handlers for powerpc/pseries.

This patch allows the powerpc/pseries platforms to perform memory DLPAR
int the kernel. The handlers for add and remove do the work of
acquiring/releasing the memory to firmware and updating the device tree.

This is only used when memory is specified in the
ibm,dynamic-reconfiguration-memory device tree node so the memory notifiers
are registered contingent on its existence.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
---
arch/powerpc/platforms/pseries/dlpar.c | 103 +++++++++++++++++++++++++++++++++
1 file changed, 103 insertions(+)

Index: linux/arch/powerpc/platforms/pseries/dlpar.c
===================================================================
--- linux.orig/arch/powerpc/platforms/pseries/dlpar.c
+++ linux/arch/powerpc/platforms/pseries/dlpar.c
@@ -15,6 +15,7 @@
#include <linux/notifier.h>
#include <linux/spinlock.h>
#include <linux/cpu.h>
+#include <linux/memory.h>
#include <linux/slab.h>
#include <linux/of.h>
#include "offline_states.h"
@@ -531,11 +532,113 @@ out:
return rc ? rc : count;
}

+static struct of_drconf_cell *dlpar_get_drconf_cell(struct device_node *dn,
+ unsigned long phys_addr)
+{
+ struct of_drconf_cell *drmem;
+ u32 entries;
+ u32 *prop;
+ int i;
+
+ prop = (u32 *)of_get_property(dn, "ibm,dynamic-memory", NULL);
+ of_node_put(dn);
+ if (!prop)
+ return NULL;
+
+ entries = *prop++;
+ drmem = (struct of_drconf_cell *)prop;
+
+ for (i = 0; i < entries; i++) {
+ if (drmem[i].base_addr == phys_addr)
+ return &drmem[i];
+ }
+
+ return NULL;
+}
+
+static int dlpar_mem_probe(unsigned long phys_addr)
+{
+ struct device_node *dn;
+ struct of_drconf_cell *drmem;
+ int rc;
+
+ dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
+ if (!dn)
+ return -EINVAL;
+
+ drmem = dlpar_get_drconf_cell(dn, phys_addr);
+ of_node_put(dn);
+
+ if (!drmem)
+ return -EINVAL;
+
+ if (drmem->flags & DRCONF_MEM_ASSIGNED)
+ return 0;
+
+ drmem->flags |= DRCONF_MEM_ASSIGNED;
+
+ rc = dlpar_acquire_drc(drmem->drc_index);
+ return rc;
+}
+
+static int dlpar_mem_release(unsigned long phys_addr)
+{
+ struct device_node *dn;
+ struct of_drconf_cell *drmem;
+ int rc;
+
+ dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
+ if (!dn)
+ return -EINVAL;
+
+ drmem = dlpar_get_drconf_cell(dn, phys_addr);
+ of_node_put(dn);
+
+ if (!drmem)
+ return -EINVAL;
+
+ if (!drmem->flags & DRCONF_MEM_ASSIGNED)
+ return 0;
+
+ drmem->flags &= ~DRCONF_MEM_ASSIGNED;
+
+ rc = dlpar_release_drc(drmem->drc_index);
+ return rc;
+}
+
+static int pseries_dlpar_mem_callback(struct notifier_block *nb,
+ unsigned long action, void *hp_arg)
+{
+ struct memory_notify *arg = hp_arg;
+ unsigned long phys_addr = arg->start_pfn << PAGE_SHIFT;
+ int rc = 0;
+
+
+ switch (action) {
+ case MEM_BEING_HOT_ADDED:
+ rc = dlpar_mem_probe(phys_addr);
+ break;
+ case MEM_HOT_REMOVED:
+ rc = dlpar_mem_release(phys_addr);
+ break;
+ }
+
+ return notifier_from_errno(rc);
+}
+
static int __init pseries_dlpar_init(void)
{
+ struct device_node *dn;
+
ppc_md.cpu_probe = dlpar_cpu_probe;
ppc_md.cpu_release = dlpar_cpu_release;

+ dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
+ if (dn) {
+ hotplug_memory_notifier(pseries_dlpar_mem_callback, 0);
+ of_node_put(dn);
+ }
+
return 0;
}
machine_device_initcall(pseries, pseries_dlpar_init);



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