1 files changed, 473 insertions, 204 deletions

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index fd481232957..3b181b22cd4 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -13,7 +13,7 @@
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/mmzone.h>
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/nodemask.h>
 #include <linux/cpu.h>
 #include <linux/notifier.h>
@@ -22,13 +22,22 @@
 #include <linux/pfn.h>
 #include <linux/cpuset.h>
 #include <linux/node.h>
+#include <linux/stop_machine.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <asm/cputhreads.h>
 #include <asm/sparsemem.h>
 #include <asm/prom.h>
-#include <asm/system.h>
 #include <asm/smp.h>
+#include <asm/cputhreads.h>
+#include <asm/topology.h>
 #include <asm/firmware.h>
 #include <asm/paca.h>
 #include <asm/hvcall.h>
+#include <asm/setup.h>
+#include <asm/vdso.h>
 
 static int numa_enabled = 1;
 
@@ -51,25 +60,22 @@ static int form1_affinity;
 
 #define MAX_DISTANCE_REF_POINTS 4
 static int distance_ref_points_depth;
-static const unsigned int *distance_ref_points;
+static const __be32 *distance_ref_points;
 static int distance_lookup_table[MAX_NUMNODES][MAX_DISTANCE_REF_POINTS];
 
 /*
  * Allocate node_to_cpumask_map based on number of available nodes
  * Requires node_possible_map to be valid.
  *
- * Note: node_to_cpumask() is not valid until after this is done.
+ * Note: cpumask_of_node() is not valid until after this is done.
  */
 static void __init setup_node_to_cpumask_map(void)
 {
-	unsigned int node, num = 0;
+	unsigned int node;
 
 	/* setup nr_node_ids if not done yet */
-	if (nr_node_ids == MAX_NUMNODES) {
-		for_each_node_mask(node, node_possible_map)
-			num = node;
-		nr_node_ids = num + 1;
-	}
+	if (nr_node_ids == MAX_NUMNODES)
+		setup_nr_node_ids();
 
 	/* allocate the map */
 	for (node = 0; node < nr_node_ids; node++)
@@ -79,7 +85,7 @@ static void __init setup_node_to_cpumask_map(void)
 	dbg("Node to cpumask map for %d nodes\n", nr_node_ids);
 }
 
-static int __cpuinit fake_numa_create_new_node(unsigned long end_pfn,
+static int __init fake_numa_create_new_node(unsigned long end_pfn,
 						unsigned int *nid)
 {
 	unsigned long long mem;
@@ -127,50 +133,43 @@ static int __cpuinit fake_numa_create_new_node(unsigned long end_pfn,
 }
 
 /*
- * get_active_region_work_fn - A helper function for get_node_active_region
- *	Returns datax set to the start_pfn and end_pfn if they contain
- *	the initial value of datax->start_pfn between them
- * @start_pfn: start page(inclusive) of region to check
- * @end_pfn: end page(exclusive) of region to check
- * @datax: comes in with ->start_pfn set to value to search for and
- *	goes out with active range if it contains it
- * Returns 1 if search value is in range else 0
+ * get_node_active_region - Return active region containing pfn
+ * Active range returned is empty if none found.
+ * @pfn: The page to return the region for
+ * @node_ar: Returned set to the active region containing @pfn
  */
-static int __init get_active_region_work_fn(unsigned long start_pfn,
-					unsigned long end_pfn, void *datax)
+static void __init get_node_active_region(unsigned long pfn,
+					  struct node_active_region *node_ar)
 {
-	struct node_active_region *data;
-	data = (struct node_active_region *)datax;
+	unsigned long start_pfn, end_pfn;
+	int i, nid;
 
-	if (start_pfn <= data->start_pfn && end_pfn > data->start_pfn) {
-		data->start_pfn = start_pfn;
-		data->end_pfn = end_pfn;
-		return 1;
+	for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {
+		if (pfn >= start_pfn && pfn < end_pfn) {
+			node_ar->nid = nid;
+			node_ar->start_pfn = start_pfn;
+			node_ar->end_pfn = end_pfn;
+			break;
+		}
 	}
-	return 0;
-
 }
 
-/*
- * get_node_active_region - Return active region containing start_pfn
- * Active range returned is empty if none found.
- * @start_pfn: The page to return the region for.
- * @node_ar: Returned set to the active region containing start_pfn
- */
-static void __init get_node_active_region(unsigned long start_pfn,
-		       struct node_active_region *node_ar)
+static void reset_numa_cpu_lookup_table(void)
 {
-	int nid = early_pfn_to_nid(start_pfn);
+	unsigned int cpu;
 
-	node_ar->nid = nid;
-	node_ar->start_pfn = start_pfn;
-	node_ar->end_pfn = start_pfn;
-	work_with_active_regions(nid, get_active_region_work_fn, node_ar);
+	for_each_possible_cpu(cpu)
+		numa_cpu_lookup_table[cpu] = -1;
 }
 
-static void map_cpu_to_node(int cpu, int node)
+static void update_numa_cpu_lookup_table(unsigned int cpu, int node)
 {
 	numa_cpu_lookup_table[cpu] = node;
+}
+
+static void map_cpu_to_node(int cpu, int node)
+{
+	update_numa_cpu_lookup_table(cpu, node);
 
 	dbg("adding cpu %d to node %d\n", cpu, node);
 
@@ -195,7 +194,7 @@ static void unmap_cpu_from_node(unsigned long cpu)
 #endif /* CONFIG_HOTPLUG_CPU || CONFIG_PPC_SPLPAR */
 
 /* must hold reference to node during call */
-static const int *of_get_associativity(struct device_node *dev)
+static const __be32 *of_get_associativity(struct device_node *dev)
 {
 	return of_get_property(dev, "ibm,associativity", NULL);
 }
@@ -205,13 +204,13 @@ static const int *of_get_associativity(struct device_node *dev)
  * it exists (the property exists only in kexec/kdump kernels,
  * added by kexec-tools)
  */
-static const u32 *of_get_usable_memory(struct device_node *memory)
+static const __be32 *of_get_usable_memory(struct device_node *memory)
 {
-	const u32 *prop;
+	const __be32 *prop;
 	u32 len;
 	prop = of_get_property(memory, "linux,drconf-usable-memory", &len);
 	if (!prop || len < sizeof(unsigned int))
-		return 0;
+		return NULL;
 	return prop;
 }
 
@@ -221,7 +220,7 @@ int __node_distance(int a, int b)
 	int distance = LOCAL_DISTANCE;
 
 	if (!form1_affinity)
-		return distance;
+		return ((a == b) ? LOCAL_DISTANCE : REMOTE_DISTANCE);
 
 	for (i = 0; i < distance_ref_points_depth; i++) {
 		if (distance_lookup_table[a][i] == distance_lookup_table[b][i])
@@ -233,9 +232,10 @@ int __node_distance(int a, int b)
 
 	return distance;
 }
+EXPORT_SYMBOL(__node_distance);
 
 static void initialize_distance_lookup_table(int nid,
-		const unsigned int *associativity)
+		const __be32 *associativity)
 {
 	int i;
 
@@ -243,29 +243,32 @@ static void initialize_distance_lookup_table(int nid,
 		return;
 
 	for (i = 0; i < distance_ref_points_depth; i++) {
-		distance_lookup_table[nid][i] =
-			associativity[distance_ref_points[i]];
+		const __be32 *entry;
+
+		entry = &associativity[be32_to_cpu(distance_ref_points[i])];
+		distance_lookup_table[nid][i] = of_read_number(entry, 1);
 	}
 }
 
 /* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa
  * info is found.
  */
-static int associativity_to_nid(const unsigned int *associativity)
+static int associativity_to_nid(const __be32 *associativity)
 {
 	int nid = -1;
 
 	if (min_common_depth == -1)
 		goto out;
 
-	if (associativity[0] >= min_common_depth)
-		nid = associativity[min_common_depth];
+	if (of_read_number(associativity, 1) >= min_common_depth)
+		nid = of_read_number(&associativity[min_common_depth], 1);
 
 	/* POWER4 LPAR uses 0xffff as invalid node */
 	if (nid == 0xffff || nid >= MAX_NUMNODES)
 		nid = -1;
 
-	if (nid > 0 && associativity[0] >= distance_ref_points_depth)
+	if (nid > 0 &&
+	    of_read_number(associativity, 1) >= distance_ref_points_depth)
 		initialize_distance_lookup_table(nid, associativity);
 
 out:
@@ -278,7 +281,7 @@ out:
 static int of_node_to_nid_single(struct device_node *device)
 {
 	int nid = -1;
-	const unsigned int *tmp;
+	const __be32 *tmp;
 
 	tmp = of_get_associativity(device);
 	if (tmp)
@@ -311,14 +314,14 @@ EXPORT_SYMBOL_GPL(of_node_to_nid);
 static int __init find_min_common_depth(void)
 {
 	int depth;
-	struct device_node *rtas_root;
-	struct device_node *chosen;
-	const char *vec5;
+	struct device_node *root;
 
-	rtas_root = of_find_node_by_path("/rtas");
-
-	if (!rtas_root)
-		return -1;
+	if (firmware_has_feature(FW_FEATURE_OPAL))
+		root = of_find_node_by_path("/ibm,opal");
+	else
+		root = of_find_node_by_path("/rtas");
+	if (!root)
+		root = of_find_node_by_path("/");
 
 	/*
 	 * This property is a set of 32-bit integers, each representing
@@ -332,7 +335,7 @@ static int __init find_min_common_depth(void)
 	 * NUMA boundary and the following are progressively less significant
 	 * boundaries. There can be more than one level of NUMA.
 	 */
-	distance_ref_points = of_get_property(rtas_root,
+	distance_ref_points = of_get_property(root,
 					"ibm,associativity-reference-points",
 					&distance_ref_points_depth);
 
@@ -343,19 +346,14 @@ static int __init find_min_common_depth(void)
 
 	distance_ref_points_depth /= sizeof(int);
 
-#define VEC5_AFFINITY_BYTE	5
-#define VEC5_AFFINITY		0x80
-	chosen = of_find_node_by_path("/chosen");
-	if (chosen) {
-		vec5 = of_get_property(chosen, "ibm,architecture-vec-5", NULL);
-		if (vec5 && (vec5[VEC5_AFFINITY_BYTE] & VEC5_AFFINITY)) {
-			dbg("Using form 1 affinity\n");
-			form1_affinity = 1;
-		}
+	if (firmware_has_feature(FW_FEATURE_OPAL) ||
+	    firmware_has_feature(FW_FEATURE_TYPE1_AFFINITY)) {
+		dbg("Using form 1 affinity\n");
+		form1_affinity = 1;
 	}
 
 	if (form1_affinity) {
-		depth = distance_ref_points[0];
+		depth = of_read_number(distance_ref_points, 1);
 	} else {
 		if (distance_ref_points_depth < 2) {
 			printk(KERN_WARNING "NUMA: "
@@ -363,7 +361,7 @@ static int __init find_min_common_depth(void)
 			goto err;
 		}
 
-		depth = distance_ref_points[1];
+		depth = of_read_number(&distance_ref_points[1], 1);
 	}
 
 	/*
@@ -376,11 +374,11 @@ static int __init find_min_common_depth(void)
 		distance_ref_points_depth = MAX_DISTANCE_REF_POINTS;
 	}
 
-	of_node_put(rtas_root);
+	of_node_put(root);
 	return depth;
 
 err:
-	of_node_put(rtas_root);
+	of_node_put(root);
 	return -1;
 }
 
@@ -397,65 +395,53 @@ static void __init get_n_mem_cells(int *n_addr_cells, int *n_size_cells)
 	of_node_put(memory);
 }
 
-static unsigned long __devinit read_n_cells(int n, const unsigned int **buf)
+static unsigned long read_n_cells(int n, const __be32 **buf)
 {
 	unsigned long result = 0;
 
 	while (n--) {
-		result = (result << 32) | **buf;
+		result = (result << 32) | of_read_number(*buf, 1);
 		(*buf)++;
 	}
 	return result;
 }
 
-struct of_drconf_cell {
-	u64	base_addr;
-	u32	drc_index;
-	u32	reserved;
-	u32	aa_index;
-	u32	flags;
-};
-
-#define DRCONF_MEM_ASSIGNED	0x00000008
-#define DRCONF_MEM_AI_INVALID	0x00000040
-#define DRCONF_MEM_RESERVED	0x00000080
-
 /*
  * Read the next memblock list entry from the ibm,dynamic-memory property
  * and return the information in the provided of_drconf_cell structure.
  */
-static void read_drconf_cell(struct of_drconf_cell *drmem, const u32 **cellp)
+static void read_drconf_cell(struct of_drconf_cell *drmem, const __be32 **cellp)
 {
-	const u32 *cp;
+	const __be32 *cp;
 
 	drmem->base_addr = read_n_cells(n_mem_addr_cells, cellp);
 
 	cp = *cellp;
-	drmem->drc_index = cp[0];
-	drmem->reserved = cp[1];
-	drmem->aa_index = cp[2];
-	drmem->flags = cp[3];
+	drmem->drc_index = of_read_number(cp, 1);
+	drmem->reserved = of_read_number(&cp[1], 1);
+	drmem->aa_index = of_read_number(&cp[2], 1);
+	drmem->flags = of_read_number(&cp[3], 1);
 
 	*cellp = cp + 4;
 }
 
 /*
- * Retreive and validate the ibm,dynamic-memory property of the device tree.
+ * Retrieve and validate the ibm,dynamic-memory property of the device tree.
  *
  * The layout of the ibm,dynamic-memory property is a number N of memblock
  * list entries followed by N memblock list entries.  Each memblock list entry
- * contains information as layed out in the of_drconf_cell struct above.
+ * contains information as laid out in the of_drconf_cell struct above.
  */
-static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
+static int of_get_drconf_memory(struct device_node *memory, const __be32 **dm)
 {
-	const u32 *prop;
+	const __be32 *prop;
 	u32 len, entries;
 
 	prop = of_get_property(memory, "ibm,dynamic-memory", &len);
 	if (!prop || len < sizeof(unsigned int))
 		return 0;
 
-	entries = *prop++;
+	entries = of_read_number(prop++, 1);
 
 	/* Now that we know the number of entries, revalidate the size
 	 * of the property read in to ensure we have everything
@@ -468,12 +454,12 @@ static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
 }
 
 /*
- * Retreive and validate the ibm,lmb-size property for drconf memory
+ * Retrieve and validate the ibm,lmb-size property for drconf memory
  * from the device tree.
  */
 static u64 of_get_lmb_size(struct device_node *memory)
 {
-	const u32 *prop;
+	const __be32 *prop;
 	u32 len;
 
 	prop = of_get_property(memory, "ibm,lmb-size", &len);
@@ -486,11 +472,11 @@ static u64 of_get_lmb_size(struct device_node *memory)
 struct assoc_arrays {
 	u32	n_arrays;
 	u32	array_sz;
-	const u32 *arrays;
+	const __be32 *arrays;
 };
 
 /*
- * Retreive and validate the list of associativity arrays for drconf
+ * Retrieve and validate the list of associativity arrays for drconf
  * memory from the ibm,associativity-lookup-arrays property of the
  * device tree..
  *
@@ -502,17 +488,17 @@ struct assoc_arrays {
 static int of_get_assoc_arrays(struct device_node *memory,
 			       struct assoc_arrays *aa)
 {
-	const u32 *prop;
+	const __be32 *prop;
 	u32 len;
 
 	prop = of_get_property(memory, "ibm,associativity-lookup-arrays", &len);
 	if (!prop || len < 2 * sizeof(unsigned int))
 		return -1;
 
-	aa->n_arrays = *prop++;
-	aa->array_sz = *prop++;
+	aa->n_arrays = of_read_number(prop++, 1);
+	aa->array_sz = of_read_number(prop++, 1);
 
-	/* Now that we know the number of arrrays and size of each array,
+	/* Now that we know the number of arrays and size of each array,
 	 * revalidate the size of the property read in.
 	 */
 	if (len < (aa->n_arrays * aa->array_sz + 2) * sizeof(unsigned int))
@@ -537,7 +523,7 @@ static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
 	    !(drmem->flags & DRCONF_MEM_AI_INVALID) &&
 	    drmem->aa_index < aa->n_arrays) {
 		index = drmem->aa_index * aa->array_sz + min_common_depth - 1;
-		nid = aa->arrays[index];
+		nid = of_read_number(&aa->arrays[index], 1);
 
 		if (nid == 0xffff || nid >= MAX_NUMNODES)
 			nid = default_nid;
@@ -550,13 +536,26 @@ static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
  * Figure out to which domain a cpu belongs and stick it there.
  * Return the id of the domain used.
  */
-static int __cpuinit numa_setup_cpu(unsigned long lcpu)
+static int numa_setup_cpu(unsigned long lcpu)
 {
-	int nid = 0;
-	struct device_node *cpu = of_get_cpu_node(lcpu, NULL);
+	int nid;
+	struct device_node *cpu;
+
+	/*
+	 * If a valid cpu-to-node mapping is already available, use it
+	 * directly instead of querying the firmware, since it represents
+	 * the most recent mapping notified to us by the platform (eg: VPHN).
+	 */
+	if ((nid = numa_cpu_lookup_table[lcpu]) >= 0) {
+		map_cpu_to_node(lcpu, nid);
+		return nid;
+	}
+
+	cpu = of_get_cpu_node(lcpu, NULL);
 
 	if (!cpu) {
 		WARN_ON(1);
+		nid = 0;
 		goto out;
 	}
 
@@ -572,17 +571,38 @@ out:
 	return nid;
 }
 
-static int __cpuinit cpu_numa_callback(struct notifier_block *nfb,
-			     unsigned long action,
+static void verify_cpu_node_mapping(int cpu, int node)
+{
+	int base, sibling, i;
+
+	/* Verify that all the threads in the core belong to the same node */
+	base = cpu_first_thread_sibling(cpu);
+
+	for (i = 0; i < threads_per_core; i++) {
+		sibling = base + i;
+
+		if (sibling == cpu || cpu_is_offline(sibling))
+			continue;
+
+		if (cpu_to_node(sibling) != node) {
+			WARN(1, "CPU thread siblings %d and %d don't belong"
+				" to the same node!\n", cpu, sibling);
+			break;
+		}
+	}
+}
+
+static int cpu_numa_callback(struct notifier_block *nfb, unsigned long action,
 			     void *hcpu)
 {
 	unsigned long lcpu = (unsigned long)hcpu;
-	int ret = NOTIFY_DONE;
+	int ret = NOTIFY_DONE, nid;
 
 	switch (action) {
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
-		numa_setup_cpu(lcpu);
+		nid = numa_setup_cpu(lcpu);
+		verify_cpu_node_mapping((int)lcpu, nid);
 		ret = NOTIFY_OK;
 		break;
 #ifdef CONFIG_HOTPLUG_CPU
@@ -604,7 +624,7 @@ static int __cpuinit cpu_numa_callback(struct notifier_block *nfb,
  * Returns the size the region should have to enforce the memory limit.
  * This will either be the original value of size, a truncated value,
  * or zero. If the returned value of size is 0 the region should be
- * discarded as it lies wholy above the memory limit.
+ * discarded as it lies wholly above the memory limit.
  */
 static unsigned long __init numa_enforce_memory_limit(unsigned long start,
 						      unsigned long size)
@@ -629,7 +649,7 @@ static unsigned long __init numa_enforce_memory_limit(unsigned long start,
  * Reads the counter for a given entry in
  * linux,drconf-usable-memory property
  */
-static inline int __init read_usm_ranges(const u32 **usm)
+static inline int __init read_usm_ranges(const __be32 **usm)
 {
 	/*
 	 * For each lmb in ibm,dynamic-memory a corresponding
@@ -646,11 +666,11 @@ static inline int __init read_usm_ranges(const u32 **usm)
  */
 static void __init parse_drconf_memory(struct device_node *memory)
 {
-	const u32 *dm, *usm;
+	const __be32 *uninitialized_var(dm), *usm;
 	unsigned int n, rc, ranges, is_kexec_kdump = 0;
 	unsigned long lmb_size, base, size, sz;
 	int nid;
-	struct assoc_arrays aa;
+	struct assoc_arrays aa = { .arrays = NULL };
 
 	n = of_get_drconf_memory(memory, &dm);
 	if (!n)
@@ -701,17 +721,15 @@ static void __init parse_drconf_memory(struct device_node *memory)
 			node_set_online(nid);
 			sz = numa_enforce_memory_limit(base, size);
 			if (sz)
-				add_active_range(nid, base >> PAGE_SHIFT,
-						 (base >> PAGE_SHIFT)
-						 + (sz >> PAGE_SHIFT));
+				memblock_set_node(base, sz,
+						  &memblock.memory, nid);
 		} while (--ranges);
 	}
 }
 
 static int __init parse_numa_properties(void)
 {
-	struct device_node *cpu = NULL;
-	struct device_node *memory = NULL;
+	struct device_node *memory;
 	int default_nid = 0;
 	unsigned long i;
 
@@ -733,6 +751,7 @@ static int __init parse_numa_properties(void)
 	 * each node to be onlined must have NODE_DATA etc backing it.
 	 */
 	for_each_present_cpu(i) {
+		struct device_node *cpu;
 		int nid;
 
 		cpu = of_get_cpu_node(i, NULL);
@@ -751,13 +770,13 @@ static int __init parse_numa_properties(void)
 	}
 
 	get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells);
-	memory = NULL;
-	while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
+
+	for_each_node_by_type(memory, "memory") {
 		unsigned long start;
 		unsigned long size;
 		int nid;
 		int ranges;
-		const unsigned int *memcell_buf;
+		const __be32 *memcell_buf;
 		unsigned int len;
 
 		memcell_buf = of_get_property(memory,
@@ -793,16 +812,16 @@ new_range:
 				continue;
 		}
 
-		add_active_range(nid, start >> PAGE_SHIFT,
-				(start >> PAGE_SHIFT) + (size >> PAGE_SHIFT));
+		memblock_set_node(start, size, &memblock.memory, nid);
 
 		if (--ranges)
 			goto new_range;
 	}
 
 	/*
-	 * Now do the same thing for each MEMBLOCK listed in the ibm,dynamic-memory
-	 * property in the ibm,dynamic-reconfiguration-memory node.
+	 * Now do the same thing for each MEMBLOCK listed in the
+	 * ibm,dynamic-memory property in the
+	 * ibm,dynamic-reconfiguration-memory node.
 	 */
 	memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
 	if (memory)
@@ -829,7 +848,9 @@ static void __init setup_nonnuma(void)
 		end_pfn = memblock_region_memory_end_pfn(reg);
 
 		fake_numa_create_new_node(end_pfn, &nid);
-		add_active_range(nid, start_pfn, end_pfn);
+		memblock_set_node(PFN_PHYS(start_pfn),
+				  PFN_PHYS(end_pfn - start_pfn),
+				  &memblock.memory, nid);
 		node_set_online(nid);
 	}
 }
@@ -954,12 +975,12 @@ static void __init *careful_zallocation(int nid, unsigned long size,
 	return ret;
 }
 
-static struct notifier_block __cpuinitdata ppc64_numa_nb = {
+static struct notifier_block ppc64_numa_nb = {
 	.notifier_call = cpu_numa_callback,
 	.priority = 1 /* Must run before sched domains notifier. */
 };
 
-static void mark_reserved_regions_for_nid(int nid)
+static void __init mark_reserved_regions_for_nid(int nid)
 {
 	struct pglist_data *node = NODE_DATA(nid);
 	struct memblock_region *reg;
@@ -970,8 +991,7 @@ static void mark_reserved_regions_for_nid(int nid)
 		unsigned long start_pfn = physbase >> PAGE_SHIFT;
 		unsigned long end_pfn = PFN_UP(physbase + size);
 		struct node_active_region node_ar;
-		unsigned long node_end_pfn = node->node_start_pfn +
-					     node->node_spanned_pages;
+		unsigned long node_end_pfn = pgdat_end_pfn(node);
 
 		/*
 		 * Check to make sure that this memblock.reserved area is
@@ -1100,6 +1120,7 @@ void __init do_init_bootmem(void)
 	 */
 	setup_node_to_cpumask_map();
 
+	reset_numa_cpu_lookup_table();
 	register_cpu_notifier(&ppc64_numa_nb);
 	cpu_numa_callback(&ppc64_numa_nb, CPU_UP_PREPARE,
 			  (void *)(unsigned long)boot_cpuid);
@@ -1141,7 +1162,7 @@ early_param("numa", early_numa);
 static int hot_add_drconf_scn_to_nid(struct device_node *memory,
 				     unsigned long scn_addr)
 {
-	const u32 *dm;
+	const __be32 *dm;
 	unsigned int drconf_cell_cnt, rc;
 	unsigned long lmb_size;
 	struct assoc_arrays aa;
@@ -1186,15 +1207,15 @@ static int hot_add_drconf_scn_to_nid(struct device_node *memory,
  * represented in the device tree as a node (i.e. memory@XXXX) for
  * each memblock.
  */
-int hot_add_node_scn_to_nid(unsigned long scn_addr)
+static int hot_add_node_scn_to_nid(unsigned long scn_addr)
 {
-	struct device_node *memory = NULL;
+	struct device_node *memory;
 	int nid = -1;
 
-	while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
+	for_each_node_by_type(memory, "memory") {
 		unsigned long start, size;
 		int ranges;
-		const unsigned int *memcell_buf;
+		const __be32 *memcell_buf;
 		unsigned int len;
 
 		memcell_buf = of_get_property(memory, "reg", &len);
@@ -1215,11 +1236,12 @@ int hot_add_node_scn_to_nid(unsigned long scn_addr)
 			break;
 		}
 
-		of_node_put(memory);
 		if (nid >= 0)
 			break;
 	}
 
+	of_node_put(memory);
+
 	return nid;
 }
 
@@ -1266,7 +1288,7 @@ static u64 hot_add_drconf_memory_max(void)
         struct device_node *memory = NULL;
         unsigned int drconf_cell_cnt = 0;
         u64 lmb_size = 0;
-        const u32 *dm = 0;
+	const __be32 *dm = NULL;
 
         memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
         if (memory) {
@@ -1291,10 +1313,18 @@ u64 memory_hotplug_max(void)
 
 /* Virtual Processor Home Node (VPHN) support */
 #ifdef CONFIG_PPC_SPLPAR
+struct topology_update_data {
+	struct topology_update_data *next;
+	unsigned int cpu;
+	int old_nid;
+	int new_nid;
+};
+
 static u8 vphn_cpu_change_counts[NR_CPUS][MAX_DISTANCE_REF_POINTS];
 static cpumask_t cpu_associativity_changes_mask;
 static int vphn_enabled;
-static void set_topology_timer(void);
+static int prrn_enabled;
+static void reset_topology_timer(void);
 
 /*
  * Store the current values of the associativity change counters in the
@@ -1330,11 +1360,9 @@ static void setup_cpu_associativity_change_counters(void)
  */
 static int update_cpu_associativity_changes_mask(void)
 {
-	int cpu, nr_cpus = 0;
+	int cpu;
 	cpumask_t *changes = &cpu_associativity_changes_mask;
 
-	cpumask_clear(changes);
-
 	for_each_possible_cpu(cpu) {
 		int i, changed = 0;
 		u8 *counts = vphn_cpu_change_counts[cpu];
@@ -1347,12 +1375,12 @@ static int update_cpu_associativity_changes_mask(void)
 			}
 		}
 		if (changed) {
-			cpumask_set_cpu(cpu, changes);
-			nr_cpus++;
+			cpumask_or(changes, changes, cpu_sibling_mask(cpu));
+			cpu = cpu_last_thread_sibling(cpu);
 		}
 	}
 
-	return nr_cpus;
+	return cpumask_weight(changes);
 }
 
 /*
@@ -1365,40 +1393,41 @@ static int update_cpu_associativity_changes_mask(void)
  * Convert the associativity domain numbers returned from the hypervisor
  * to the sequence they would appear in the ibm,associativity property.
  */
-static int vphn_unpack_associativity(const long *packed, unsigned int *unpacked)
+static int vphn_unpack_associativity(const long *packed, __be32 *unpacked)
 {
 	int i, nr_assoc_doms = 0;
-	const u16 *field = (const u16*) packed;
+	const __be16 *field = (const __be16 *) packed;
 
 #define VPHN_FIELD_UNUSED	(0xffff)
 #define VPHN_FIELD_MSB		(0x8000)
 #define VPHN_FIELD_MASK		(~VPHN_FIELD_MSB)
 
 	for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) {
-		if (*field == VPHN_FIELD_UNUSED) {
+		if (be16_to_cpup(field) == VPHN_FIELD_UNUSED) {
 			/* All significant fields processed, and remaining
 			 * fields contain the reserved value of all 1's.
 			 * Just store them.
 			 */
-			unpacked[i] = *((u32*)field);
+			unpacked[i] = *((__be32 *)field);
 			field += 2;
-		} else if (*field & VPHN_FIELD_MSB) {
+		} else if (be16_to_cpup(field) & VPHN_FIELD_MSB) {
 			/* Data is in the lower 15 bits of this field */
-			unpacked[i] = *field & VPHN_FIELD_MASK;
+			unpacked[i] = cpu_to_be32(
+				be16_to_cpup(field) & VPHN_FIELD_MASK);
 			field++;
 			nr_assoc_doms++;
 		} else {
 			/* Data is in the lower 15 bits of this field
 			 * concatenated with the next 16 bit field
 			 */
-			unpacked[i] = *((u32*)field);
+			unpacked[i] = *((__be32 *)field);
 			field += 2;
 			nr_assoc_doms++;
 		}
 	}
 
 	/* The first cell contains the length of the property */
-	unpacked[0] = nr_assoc_doms;
+	unpacked[0] = cpu_to_be32(nr_assoc_doms);
 
 	return nr_assoc_doms;
 }
@@ -1407,7 +1436,7 @@ static int vphn_unpack_associativity(const long *packed, unsigned int *unpacked)
  * Retrieve the new associativity information for a virtual processor's
  * home node.
  */
-static long hcall_vphn(unsigned long cpu, unsigned int *associativity)
+static long hcall_vphn(unsigned long cpu, __be32 *associativity)
 {
 	long rc;
 	long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
@@ -1421,7 +1450,7 @@ static long hcall_vphn(unsigned long cpu, unsigned int *associativity)
 }
 
 static long vphn_get_associativity(unsigned long cpu,
-					unsigned int *associativity)
+					__be32 *associativity)
 {
 	long rc;
 
@@ -1444,40 +1473,163 @@ static long vphn_get_associativity(unsigned long cpu,
 }
 
 /*
+ * Update the CPU maps and sysfs entries for a single CPU when its NUMA
+ * characteristics change. This function doesn't perform any locking and is
+ * only safe to call from stop_machine().
+ */
+static int update_cpu_topology(void *data)
+{
+	struct topology_update_data *update;
+	unsigned long cpu;
+
+	if (!data)
+		return -EINVAL;
+
+	cpu = smp_processor_id();
+
+	for (update = data; update; update = update->next) {
+		if (cpu != update->cpu)
+			continue;
+
+		unmap_cpu_from_node(update->cpu);
+		map_cpu_to_node(update->cpu, update->new_nid);
+		vdso_getcpu_init();
+	}
+
+	return 0;
+}
+
+static int update_lookup_table(void *data)
+{
+	struct topology_update_data *update;
+
+	if (!data)
+		return -EINVAL;
+
+	/*
+	 * Upon topology update, the numa-cpu lookup table needs to be updated
+	 * for all threads in the core, including offline CPUs, to ensure that
+	 * future hotplug operations respect the cpu-to-node associativity
+	 * properly.
+	 */
+	for (update = data; update; update = update->next) {
+		int nid, base, j;
+
+		nid = update->new_nid;
+		base = cpu_first_thread_sibling(update->cpu);
+
+		for (j = 0; j < threads_per_core; j++) {
+			update_numa_cpu_lookup_table(base + j, nid);
+		}
+	}
+
+	return 0;
+}
+
+/*
  * Update the node maps and sysfs entries for each cpu whose home node
- * has changed.
+ * has changed. Returns 1 when the topology has changed, and 0 otherwise.
  */
 int arch_update_cpu_topology(void)
 {
-	int cpu, nid, old_nid;
-	unsigned int associativity[VPHN_ASSOC_BUFSIZE] = {0};
-	struct sys_device *sysdev;
+	unsigned int cpu, sibling, changed = 0;
+	struct topology_update_data *updates, *ud;
+	__be32 associativity[VPHN_ASSOC_BUFSIZE] = {0};
+	cpumask_t updated_cpus;
+	struct device *dev;
+	int weight, new_nid, i = 0;
+
+	weight = cpumask_weight(&cpu_associativity_changes_mask);
+	if (!weight)
+		return 0;
+
+	updates = kzalloc(weight * (sizeof(*updates)), GFP_KERNEL);
+	if (!updates)
+		return 0;
+
+	cpumask_clear(&updated_cpus);
+
+	for_each_cpu(cpu, &cpu_associativity_changes_mask) {
+		/*
+		 * If siblings aren't flagged for changes, updates list
+		 * will be too short. Skip on this update and set for next
+		 * update.
+		 */
+		if (!cpumask_subset(cpu_sibling_mask(cpu),
+					&cpu_associativity_changes_mask)) {
+			pr_info("Sibling bits not set for associativity "
+					"change, cpu%d\n", cpu);
+			cpumask_or(&cpu_associativity_changes_mask,
+					&cpu_associativity_changes_mask,
+					cpu_sibling_mask(cpu));
+			cpu = cpu_last_thread_sibling(cpu);
+			continue;
+		}
 
-	for_each_cpu_mask(cpu, cpu_associativity_changes_mask) {
+		/* Use associativity from first thread for all siblings */
 		vphn_get_associativity(cpu, associativity);
-		nid = associativity_to_nid(associativity);
+		new_nid = associativity_to_nid(associativity);
+		if (new_nid < 0 || !node_online(new_nid))
+			new_nid = first_online_node;
+
+		if (new_nid == numa_cpu_lookup_table[cpu]) {
+			cpumask_andnot(&cpu_associativity_changes_mask,
+					&cpu_associativity_changes_mask,
+					cpu_sibling_mask(cpu));
+			cpu = cpu_last_thread_sibling(cpu);
+			continue;
+		}
+
+		for_each_cpu(sibling, cpu_sibling_mask(cpu)) {
+			ud = &updates[i++];
+			ud->cpu = sibling;
+			ud->new_nid = new_nid;
+			ud->old_nid = numa_cpu_lookup_table[sibling];
+			cpumask_set_cpu(sibling, &updated_cpus);
+			if (i < weight)
+				ud->next = &updates[i];
+		}
+		cpu = cpu_last_thread_sibling(cpu);
+	}
 
-		if (nid < 0 || !node_online(nid))
-			nid = first_online_node;
+	/*
+	 * In cases where we have nothing to update (because the updates list
+	 * is too short or because the new topology is same as the old one),
+	 * skip invoking update_cpu_topology() via stop-machine(). This is
+	 * necessary (and not just a fast-path optimization) since stop-machine
+	 * can end up electing a random CPU to run update_cpu_topology(), and
+	 * thus trick us into setting up incorrect cpu-node mappings (since
+	 * 'updates' is kzalloc()'ed).
+	 *
+	 * And for the similar reason, we will skip all the following updating.
+	 */
+	if (!cpumask_weight(&updated_cpus))
+		goto out;
 
-		old_nid = numa_cpu_lookup_table[cpu];
+	stop_machine(update_cpu_topology, &updates[0], &updated_cpus);
 
-		/* Disable hotplug while we update the cpu
-		 * masks and sysfs.
-		 */
-		get_online_cpus();
-		unregister_cpu_under_node(cpu, old_nid);
-		unmap_cpu_from_node(cpu);
-		map_cpu_to_node(cpu, nid);
-		register_cpu_under_node(cpu, nid);
-		put_online_cpus();
-
-		sysdev = get_cpu_sysdev(cpu);
-		if (sysdev)
-			kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
+	/*
+	 * Update the numa-cpu lookup table with the new mappings, even for
+	 * offline CPUs. It is best to perform this update from the stop-
+	 * machine context.
+	 */
+	stop_machine(update_lookup_table, &updates[0],
+					cpumask_of(raw_smp_processor_id()));
+
+	for (ud = &updates[0]; ud; ud = ud->next) {
+		unregister_cpu_under_node(ud->cpu, ud->old_nid);
+		register_cpu_under_node(ud->cpu, ud->new_nid);
+
+		dev = get_cpu_device(ud->cpu);
+		if (dev)
+			kobject_uevent(&dev->kobj, KOBJ_CHANGE);
+		cpumask_clear_cpu(ud->cpu, &cpu_associativity_changes_mask);
+		changed = 1;
 	}
 
-	return 1;
+out:
+	kfree(updates);
+	return changed;
 }
 
 static void topology_work_fn(struct work_struct *work)
@@ -1486,55 +1638,172 @@ static void topology_work_fn(struct work_struct *work)
 }
 static DECLARE_WORK(topology_work, topology_work_fn);
 
-void topology_schedule_update(void)
+static void topology_schedule_update(void)
 {
 	schedule_work(&topology_work);
 }
 
 static void topology_timer_fn(unsigned long ignored)
 {
-	if (!vphn_enabled)
-		return;
-	if (update_cpu_associativity_changes_mask() > 0)
+	if (prrn_enabled && cpumask_weight(&cpu_associativity_changes_mask))
 		topology_schedule_update();
-	set_topology_timer();
+	else if (vphn_enabled) {
+		if (update_cpu_associativity_changes_mask() > 0)
+			topology_schedule_update();
+		reset_topology_timer();
+	}
 }
 static struct timer_list topology_timer =
 	TIMER_INITIALIZER(topology_timer_fn, 0, 0);
 
-static void set_topology_timer(void)
+static void reset_topology_timer(void)
 {
 	topology_timer.data = 0;
 	topology_timer.expires = jiffies + 60 * HZ;
-	add_timer(&topology_timer);
+	mod_timer(&topology_timer, topology_timer.expires);
+}
+
+#ifdef CONFIG_SMP
+
+static void stage_topology_update(int core_id)
+{
+	cpumask_or(&cpu_associativity_changes_mask,
+		&cpu_associativity_changes_mask, cpu_sibling_mask(core_id));
+	reset_topology_timer();
+}
+
+static int dt_update_callback(struct notifier_block *nb,
+				unsigned long action, void *data)
+{
+	struct of_prop_reconfig *update;
+	int rc = NOTIFY_DONE;
+
+	switch (action) {
+	case OF_RECONFIG_UPDATE_PROPERTY:
+		update = (struct of_prop_reconfig *)data;
+		if (!of_prop_cmp(update->dn->type, "cpu") &&
+		    !of_prop_cmp(update->prop->name, "ibm,associativity")) {
+			u32 core_id;
+			of_property_read_u32(update->dn, "reg", &core_id);
+			stage_topology_update(core_id);
+			rc = NOTIFY_OK;
+		}
+		break;
+	}
+
+	return rc;
 }
 
+static struct notifier_block dt_update_nb = {
+	.notifier_call = dt_update_callback,
+};
+
+#endif
+
 /*
- * Start polling for VPHN associativity changes.
+ * Start polling for associativity changes.
  */
 int start_topology_update(void)
 {
 	int rc = 0;
 
-	if (firmware_has_feature(FW_FEATURE_VPHN) &&
-	    get_lppaca()->shared_proc) {
-		vphn_enabled = 1;
-		setup_cpu_associativity_change_counters();
-		init_timer_deferrable(&topology_timer);
-		set_topology_timer();
-		rc = 1;
+	if (firmware_has_feature(FW_FEATURE_PRRN)) {
+		if (!prrn_enabled) {
+			prrn_enabled = 1;
+			vphn_enabled = 0;
+#ifdef CONFIG_SMP
+			rc = of_reconfig_notifier_register(&dt_update_nb);
+#endif
+		}
+	} else if (firmware_has_feature(FW_FEATURE_VPHN) &&
+		   lppaca_shared_proc(get_lppaca())) {
+		if (!vphn_enabled) {
+			prrn_enabled = 0;
+			vphn_enabled = 1;
+			setup_cpu_associativity_change_counters();
+			init_timer_deferrable(&topology_timer);
+			reset_topology_timer();
+		}
 	}
 
 	return rc;
 }
-__initcall(start_topology_update);
 
 /*
  * Disable polling for VPHN associativity changes.
  */
 int stop_topology_update(void)
 {
-	vphn_enabled = 0;
-	return del_timer_sync(&topology_timer);
+	int rc = 0;
+
+	if (prrn_enabled) {
+		prrn_enabled = 0;
+#ifdef CONFIG_SMP
+		rc = of_reconfig_notifier_unregister(&dt_update_nb);
+#endif
+	} else if (vphn_enabled) {
+		vphn_enabled = 0;
+		rc = del_timer_sync(&topology_timer);
+	}
+
+	return rc;
+}
+
+int prrn_is_enabled(void)
+{
+	return prrn_enabled;
+}
+
+static int topology_read(struct seq_file *file, void *v)
+{
+	if (vphn_enabled || prrn_enabled)
+		seq_puts(file, "on\n");
+	else
+		seq_puts(file, "off\n");
+
+	return 0;
+}
+
+static int topology_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, topology_read, NULL);
+}
+
+static ssize_t topology_write(struct file *file, const char __user *buf,
+			      size_t count, loff_t *off)
+{
+	char kbuf[4]; /* "on" or "off" plus null. */
+	int read_len;
+
+	read_len = count < 3 ? count : 3;
+	if (copy_from_user(kbuf, buf, read_len))
+		return -EINVAL;
+
+	kbuf[read_len] = '\0';
+
+	if (!strncmp(kbuf, "on", 2))
+		start_topology_update();
+	else if (!strncmp(kbuf, "off", 3))
+		stop_topology_update();
+	else
+		return -EINVAL;
+
+	return count;
+}
+
+static const struct file_operations topology_ops = {
+	.read = seq_read,
+	.write = topology_write,
+	.open = topology_open,
+	.release = single_release
+};
+
+static int topology_update_init(void)
+{
+	start_topology_update();
+	proc_create("powerpc/topology_updates", 0644, NULL, &topology_ops);
+
+	return 0;
 }
+device_initcall(topology_update_init);
 #endif /* CONFIG_PPC_SPLPAR */