Resend: [PATCH V7 0/8] powerpc/devtree: Add support for 2 new DRC properties

@@ -51,6 +51,8 @@
 #define FW_FEATURE_BEST_ENERGY	ASM_CONST(0x0000000080000000)
 #define FW_FEATURE_TYPE1_AFFINITY ASM_CONST(0x0000000100000000)
 #define FW_FEATURE_PRRN		ASM_CONST(0x0000000200000000)
+#define FW_FEATURE_DYN_MEM_V2	ASM_CONST(0x0000000400000000)
+#define FW_FEATURE_DRC_INFO	ASM_CONST(0x0000000800000000)
 
 #ifndef __ASSEMBLY__
 

@@ -66,7 +68,8 @@ enum {
 		FW_FEATURE_MULTITCE | FW_FEATURE_SPLPAR | FW_FEATURE_LPAR |
 		FW_FEATURE_CMO | FW_FEATURE_VPHN | FW_FEATURE_XCMO |
 		FW_FEATURE_SET_MODE | FW_FEATURE_BEST_ENERGY |
-		FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN,
+		FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN |
+		FW_FEATURE_DYN_MEM_V2 | FW_FEATURE_DRC_INFO,
 	FW_FEATURE_PSERIES_ALWAYS = 0,
 	FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL,
 	FW_FEATURE_POWERNV_ALWAYS = 0,

@@ -155,6 +203,8 @@ struct of_drconf_cell {
 #define OV5_PFO_HW_842		0x0E40	/* PFO Compression Accelerator */
 #define OV5_PFO_HW_ENCR		0x0E20	/* PFO Encryption Accelerator */
 #define OV5_SUB_PROCESSORS	0x0F01	/* 1,2,or 4 Sub-Processors supported */
+#define OV5_DYN_MEM_V2		0x1680	/* Redef Prop Structures: dyn-mem-v2 */
+#define OV5_DRC_INFO		0x1640	/* Redef Prop Structures: drc-info   */
 
 /* Option Vector 6: IBM PAPR hints */
 #define OV6_LINUX		0x02	/* Linux is our OS */

@@ -113,6 +113,8 @@ static __initdata struct vec5_fw_feature
 vec5_fw_features_table[] = {
 	{FW_FEATURE_TYPE1_AFFINITY,	OV5_TYPE1_AFFINITY},
 	{FW_FEATURE_PRRN,		OV5_PRRN},
+	{FW_FEATURE_DYN_MEM_V2,		OV5_DYN_MEM_V2},
+	{FW_FEATURE_DRC_INFO,		OV5_DRC_INFO},
 };
 
 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)

@@ -69,6 +69,8 @@ struct boot_param_header {
  * OF address retreival & translation
  */
 
+extern int n_mem_addr_cells;
+
 /* Parse the ibm,dma-window property of an OF node into the busno, phys and
  * size parameters.
  */

@@ -81,8 +83,9 @@ extern void of_instantiate_rtc(void);
 extern int of_get_ibm_chip_id(struct device_node *np);
 
 /* The of_drconf_cell struct defines the layout of the LMB array
- * specified in the device tree property
- * ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory
+ * specified in the device tree properties,
+ *     ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory
+ *     ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory-v2
  */
 struct of_drconf_cell {
 	u64	base_addr;

@@ -92,9 +95,20 @@ struct of_drconf_cell {
 	u32	flags;
 };
 
-#define DRCONF_MEM_ASSIGNED	0x00000008
-#define DRCONF_MEM_AI_INVALID	0x00000040
-#define DRCONF_MEM_RESERVED	0x00000080
+#define DRCONF_MEM_ASSIGNED		0x00000008
+#define DRCONF_MEM_AI_INVALID		0x00000040
+#define DRCONF_MEM_RESERVED		0x00000080
+
+struct of_drconf_cell_v2 {
+	u32	num_seq_lmbs;
+	u64	base_addr;
+	u32	drc_index;
+	u32	aa_index;
+	u32	flags;
+} __attribute__((packed));
+
+extern void read_drconf_cell_v2(struct of_drconf_cell_v2 *drmem,
+				const __be32 **cellp);
 
 /*
  * There are two methods for telling firmware what our capabilities are.

@@ -57,8 +57,10 @@
 EXPORT_SYMBOL(node_data);
 
 static int min_common_depth;
-static int n_mem_addr_cells, n_mem_size_cells;
+int n_mem_addr_cells;
+static int n_mem_size_cells;
 static int form1_affinity;
+EXPORT_SYMBOL(n_mem_addr_cells);
 
 #define MAX_DISTANCE_REF_POINTS 4
 static int distance_ref_points_depth;

@@ -405,6 +405,24 @@ static void read_drconf_cell(struct of_drconf_cell *drmem, const __be32 **cellp)
 
 	*cellp = cp + 4;
 }
+ 
+ /*
+ * Retrieve and validate the ibm,dynamic-memory property of the device tree.
+ * Read the next memory block set entry from the ibm,dynamic-memory-v2 property
+ * and return the information in the provided of_drconf_cell_v2 structure.
+ */
+void read_drconf_cell_v2(struct of_drconf_cell_v2 *drmem, const __be32 **cellp)
+{
+	const __be32 *cp = (const __be32 *)*cellp;
+	drmem->num_seq_lmbs = be32_to_cpu(*cp++);
+	drmem->base_addr = read_n_cells(n_mem_addr_cells, &cp);
+	drmem->drc_index = be32_to_cpu(*cp++);
+	drmem->aa_index = be32_to_cpu(*cp++);
+	drmem->flags = be32_to_cpu(*cp++);
+
+	*cellp = cp;
+}
+EXPORT_SYMBOL(read_drconf_cell_v2);
 
 /*
  * Retrieve and validate the ibm,dynamic-memory property of the device tree.

@@ -443,23 +443,34 @@ static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
 
 #ifdef CONFIG_PPC_PSERIES
 /*
- * Interpret the ibm,dynamic-memory property in the
- * /ibm,dynamic-reconfiguration-memory node.
+ * Retrieve and validate the ibm,lmb-size property for drconf memory
+ * from the flattened device tree.
+ */
+static u64 __init get_lmb_size(unsigned long node)
+{
+	const __be32 *ls;
+	int len;
+	ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
+	if (!ls || len < dt_root_size_cells * sizeof(__be32))
+		return 0;
+	return dt_mem_next_cell(dt_root_size_cells, &ls);
+}
+
+/*
+ * Interpret the ibm,dynamic-memory property/ibm,dynamic-memory-v2
+ * in the /ibm,dynamic-reconfiguration-memory node.
  * This contains a list of memory blocks along with NUMA affinity
  * information.
  */
-static int __init early_init_dt_scan_drconf_memory(unsigned long node)
+static int __init early_init_dt_scan_drconf_memory_v1(unsigned long node)
 {
-	const __be32 *dm, *ls, *usm;
+	const __be32 *dm, *usm;
 	int l;
 	unsigned long n, flags;
 	u64 base, size, memblock_size;
 	unsigned int is_kexec_kdump = 0, rngs;
 
-	ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
-	if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
-		return 0;
-	memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
+	memblock_size = get_lmb_size(node);
 
 	dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
 	if (dm == NULL || l < sizeof(__be32))

@@ -518,6 +529,76 @@ static int __init early_init_dt_scan_drconf_memory(unsigned long node)
 	memblock_dump_all();
 	return 0;
 }
+
+static int __init early_init_dt_scan_drconf_memory_v2(unsigned long node)
+{
+	const __be32 *dm;
+	int l;
+	unsigned long num_sets;
+	u64 size, base, memblock_size;
+
+	memblock_size = get_lmb_size(node);
+
+	dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory-v2", &l);
+	if (dm == NULL || l < sizeof(__be32))
+		return 0;
+
+	/* Verify expected length of the array of ibm,dynamic-memory-v2
+	 * structs fits in the actual size of the property data.
+	 */
+	num_sets = of_read_number(dm++, 1);
+	if (l < (num_sets * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
+		return 0;
+
+	if (n_mem_addr_cells == 0)
+		n_mem_addr_cells = dt_root_addr_cells;
+
+	for (; num_sets != 0; --num_sets) {
+		struct of_drconf_cell_v2 drmem;
+		unsigned long nsl;
+
+		read_drconf_cell_v2(&drmem, &dm);
+		base = drmem.base_addr;
+		nsl = drmem.num_seq_lmbs;
+		size = memblock_size;
+
+		/* SKip this block if the reserved bit is set in flags
+		 * or if the block is not assigned to this partition
+		 */
+		if ((drmem.flags & DRCONF_MEM_RESERVED) ||
+		    !(drmem.flags & DRCONF_MEM_ASSIGNED))
+			continue;
+
+		for (; nsl != 0; nsl--) {
+			size = memblock_size;
+
+			if (iommu_is_off) {
+				if (base >= 0x80000000ul)
+					continue;
+				if ((base + size) > 0x80000000ul)
+					size = 0x80000000ul - base;
+			}
+			memblock_add(base, size);
+
+			base += size;
+		}
+	}
+
+	memblock_dump_all();
+	return 0;
+}
+
+static int __init early_init_dt_scan_drconf_memory(unsigned long node)
+{
+	const __be32 *dm;
+	int l;
+	dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory-v2", &l);
+	if (dm == NULL || l < sizeof(__be32))
+		return early_init_dt_scan_drconf_memory_v1(node);
+	else
+		return early_init_dt_scan_drconf_memory_v2(node);
+}
+
 #else
 #define early_init_dt_scan_drconf_memory(node)	0
 #endif /* CONFIG_PPC_PSERIES */

@@ -109,6 +109,18 @@ struct of_drconf_cell_v2 {
 
 extern void read_drconf_cell_v2(struct of_drconf_cell_v2 *drmem,
 				const __be32 **cellp);
+
+extern void read_one_drc_info(int **info, char **drc_type, char **drc_name,
+			unsigned long int *fdi_p, unsigned long int *nsl_p,
+			unsigned long int *si_p, unsigned long int *ldi_p);
+
+static inline int dyn_mem_v2_len(int entries)
+{
+	int drconf_v2_cells = (n_mem_addr_cells + 4);
+	int drconf_v2_cells_len = (drconf_v2_cells * sizeof(unsigned int));
+	return (((entries) * drconf_v2_cells_len) +
+                (1 * sizeof(unsigned int)));
+}
 
 /*
  * There are two methods for telling firmware what our capabilities are.

@@ -427,30 +426,55 @@
 EXPORT_SYMBOL(read_drconf_cell_v2);
 
 /*
- * Retrieve and validate the ibm,dynamic-memory property of the device tree.
+ * Retrieve and validate the ibm,dynamic-memory[-v2] property of the
+ * device tree.
+ *
+ * The layout of the ibm,dynamic-memory property is a number N of memory
+ * block description list entries followed by N memory block description
+ * list entries.  Each memory block description list entry contains
+ * information as laid out in the of_drconf_cell struct above.
  *
- * 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 laid out in the of_drconf_cell struct above.
+ * The layout of the ibm,dynamic-memory-v2 property is a number N of memory
+ * block set description list entries, followed by N memory block set
+ * description set entries.
  */
 static int of_get_drconf_memory(struct device_node *memory, const __be32 **dm)
 {
 	const __be32 *prop;
 	u32 len, entries;
 
-	prop = of_get_property(memory, "ibm,dynamic-memory", &len);
-	if (!prop || len < sizeof(unsigned int))
-		return 0;
+	if (firmware_has_feature(FW_FEATURE_DYN_MEM_V2)) {
 
-	entries = of_read_number(prop++, 1);
+		prop = of_get_property(memory, "ibm,dynamic-memory-v2", &len);
+		if (!prop || len < sizeof(unsigned int))
+			return 0;
 
-	/* Now that we know the number of entries, revalidate the size
-	 * of the property read in to ensure we have everything
-	 */
-	if (len < (entries * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int))
-		return 0;
+		entries = of_read_number(prop++, 1);
+
+		/* Now that we know the number of set entries, revalidate the
+		 * size of the property read in to ensure we have everything.
+		 */
+		if (len < dyn_mem_v2_len(entries))
+			return 0;
+
+		*dm = prop;
+	} else {
+		prop = of_get_property(memory, "ibm,dynamic-memory", &len);
+		if (!prop || len < sizeof(unsigned int))
+			return 0;
+
+		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
+		 */
+		if (len < (entries * (n_mem_addr_cells + 4) + 1) *
+			   sizeof(unsigned int))
+			return 0;
+
+		*dm = prop;
+	}
 
-	*dm = prop;
 	return entries;
 }
 

@@ -513,7 +537,7 @@
  * This is like of_node_to_nid_single() for memory represented in the
  * ibm,dynamic-reconfiguration-memory node.
  */
-static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
+static int of_drconf_to_nid_single(u32 drmem_flags, u32 drmem_aa_index,
 				   struct assoc_arrays *aa)
 {
 	int default_nid = 0;

@@ -521,16 +545,16 @@
 	int index;
 
 	if (min_common_depth > 0 && min_common_depth <= aa->array_sz &&
-	    !(drmem->flags & DRCONF_MEM_AI_INVALID) &&
-	    drmem->aa_index < aa->n_arrays) {
-		index = drmem->aa_index * aa->array_sz + min_common_depth - 1;
+	    !(drmem_flags & DRCONF_MEM_AI_INVALID) &&
+	    drmem_aa_index < aa->n_arrays) {
+		index = drmem_aa_index * aa->array_sz + min_common_depth - 1;
 		nid = of_read_number(&aa->arrays[index], 1);
 
 		if (nid == 0xffff || nid >= MAX_NUMNODES)
 			nid = default_nid;
 
 		if (nid > 0) {
-			index = drmem->aa_index * aa->array_sz;
+			index = drmem_aa_index * aa->array_sz;
 			initialize_distance_lookup_table(nid,
 							&aa->arrays[index]);
 		}

@@ -665,7 +697,7 @@
  * Extract NUMA information from the ibm,dynamic-reconfiguration-memory
  * node.  This assumes n_mem_{addr,size}_cells have been set.
  */
-static void __init parse_drconf_memory(struct device_node *memory)
+static void __init parse_drconf_memory_v1(struct device_node *memory)
 {
 	const __be32 *uninitialized_var(dm), *usm;
 	unsigned int n, rc, ranges, is_kexec_kdump = 0;

@@ -715,10 +747,11 @@
 				base = read_n_cells(n_mem_addr_cells, &usm);
 				size = read_n_cells(n_mem_size_cells, &usm);
 			}
-			nid = of_drconf_to_nid_single(&drmem, &aa);
+			nid = of_drconf_to_nid_single(drmem.flags,
+							drmem.aa_index, &aa);
 			fake_numa_create_new_node(
 				((base + size) >> PAGE_SHIFT),
 					   &nid);
 			node_set_online(nid);
 			sz = numa_enforce_memory_limit(base, size);
 			if (sz)

@@ -728,6 +761,80 @@
 	}
 }
 
+static void __init parse_drconf_memory_v2(struct device_node *memory)
+{
+	const __be32 *uninitialized_var(dm);
+	unsigned int num_lmb_sets, rc;
+	unsigned long lmb_size, base;
+	unsigned long size, sz;
+	int nid;
+	struct assoc_arrays aa = { .arrays = NULL };
+	const __be32 *prop;
+	u32	len;
+
+	prop = of_get_property(memory, "ibm,dynamic-memory-v2", &len);
+	if (!prop)
+		return;
+
+	num_lmb_sets = of_get_drconf_memory(memory, &dm);
+	if (!num_lmb_sets)
+		return;
+
+	lmb_size = of_get_lmb_size(memory);
+	if (!lmb_size)
+		return;
+
+	rc = of_get_assoc_arrays(memory, &aa);
+	if (rc)
+		return;
+
+	for (; num_lmb_sets != 0; num_lmb_sets--) {
+		struct of_drconf_cell_v2 drmem;
+		unsigned long nsl;
+
+		/* Get the current LMB set */
+		read_drconf_cell_v2(&drmem, &dm);
+		base = drmem.base_addr;
+		nsl = drmem.num_seq_lmbs;
+
+		/* Skip this block if the reserved bit is set in
+		 * flags (0x80) or if the block is not assigned
+		 * to this partition (0x8)
+		 */
+		if ((drmem.flags & DRCONF_MEM_RESERVED)
+		    || !(drmem.flags & DRCONF_MEM_ASSIGNED))
+			continue;
+
+		for (; nsl != 0; nsl--) {
+			size = lmb_size;
+
+			nid = of_drconf_to_nid_single(drmem.flags,
+						drmem.aa_index, &aa);
+			fake_numa_create_new_node(
+					((base + size) >> PAGE_SHIFT),
+					&nid);
+			node_set_online(nid);
+			sz = numa_enforce_memory_limit(base, size);
+			if (sz)
+				memblock_set_node(base, sz,
+						&memblock.memory, nid);
+
+			base += sz;
+		}
+	}
+}
+
+static void __init parse_drconf_memory(struct device_node *memory)
+{
+	const __be32 *prop;
+	int len;
+	prop = of_get_property(memory, "ibm,dynamic-memory-v2", &len);
+	if (!prop || len < sizeof(unsigned int))
+		parse_drconf_memory_v1(memory);
+	else
+		parse_drconf_memory_v2(memory);
+}
+
 static int __init parse_numa_properties(void)
 {
 	struct device_node *memory;

@@ -1082,8 +1211,8 @@ static int hot_add_drconf_scn_to_nid(struct device_node *memory,
 		if ((scn_addr < drmem.base_addr)
 		    || (scn_addr >= (drmem.base_addr + lmb_size)))
 			continue;
-
-		nid = of_drconf_to_nid_single(&drmem, &aa);
+		nid = of_drconf_to_nid_single(drmem.flags,
+						drmem.aa_index, &aa);
 		break;
 	}
 

@@ -24,6 +24,8 @@
 #include <asm/sparsemem.h>
 #include "pseries.h"
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+
 static bool rtas_hp_event;
 
 unsigned long pseries_memory_block_size(void)

@@ -887,11 +889,102 @@ static int pseries_memory_notifier(struct notifier_block *nb,
 static struct notifier_block pseries_mem_nb = {
 	.notifier_call = pseries_memory_notifier,
 };
+#endif /* CONFIG_MEMORY_HOTPLUG */
+
+static int pseries_rewrite_dynamic_memory_v2(void)
+{
+	unsigned long memblock_size;
+	struct device_node *dn;
+	struct property *prop, *prop_v2;
+	__be32 *p;
+	struct of_drconf_cell *lmbs;
+	u32 num_lmb_desc_sets, num_lmbs;
+	int i, j, k;
+
+	dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
+	if (!dn)
+		return -EINVAL;
+
+	prop_v2 = of_find_property(dn, "ibm,dynamic-memory-v2", NULL);
+	if (!prop_v2)
+		return -EINVAL;
+
+	memblock_size = pseries_memory_block_size();
+	if (!memblock_size)
+		return -EINVAL;
+
+	/* The first int of the property is the number of lmb sets
+	 * described by the property.
+	 */
+	p = (__be32 *)prop_v2->value;
+	num_lmb_desc_sets = be32_to_cpu(*p++);
+
+	/* Count the number of LMBs for generating the alternate format
+	 */
+	for (i = 0, num_lmbs = 0; i < num_lmb_desc_sets; i++) {
+		struct of_drconf_cell_v2 drmem;
+
+		read_drconf_cell_v2(&drmem, (const __be32 **)&p);
+		num_lmbs += drmem.num_seq_lmbs;
+	}
+
+	/* Create an empty copy of the new 'ibm,dynamic-memory' property
+	 */
+	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+	if (!prop)
+		return -ENOMEM;
+	prop->name = kstrdup("ibm,dynamic-memory", GFP_KERNEL);
+	prop->length = dyn_mem_v2_len(num_lmbs);
+	prop->value = kzalloc(prop->length, GFP_KERNEL);
+
+	/* Copy/expand the ibm,dynamic-memory-v2 format to produce the
+	 * ibm,dynamic-memory format.
+	 */
+	p = (__be32 *)prop->value;
+	*p = cpu_to_be32(num_lmbs);
+	p++;
+	lmbs = (struct of_drconf_cell *)p;
+
+	p = (__be32 *)prop_v2->value;
+	p++;
+
+	for (i = 0, k = 0; i < num_lmb_desc_sets; i++) {
+		struct of_drconf_cell_v2 drmem;
+
+		read_drconf_cell_v2(&drmem, (const __be32 **)&p);
+
+		for (j = 0; j < drmem.num_seq_lmbs; j++) {
+			lmbs[k+j].base_addr = be64_to_cpu(drmem.base_addr);
+			lmbs[k+j].drc_index = be32_to_cpu(drmem.drc_index);
+			lmbs[k+j].reserved  = 0;
+			lmbs[k+j].aa_index  = be32_to_cpu(drmem.aa_index);
+			lmbs[k+i].flags     = be32_to_cpu(drmem.flags);
+
+			drmem.base_addr += memblock_size;
+			drmem.drc_index++;
+		}
+
+		k += drmem.num_seq_lmbs;
+	}
+
+	of_remove_property(dn, prop_v2);
+
+	of_add_property(dn, prop);
+
+	/* And disable feature flag since the property has gone away */
+	powerpc_firmware_features &= ~FW_FEATURE_DYN_MEM_V2;
+
+	return 0;
+}
 
 static int __init pseries_memory_hotplug_init(void)
 {
+	if (firmware_has_feature(FW_FEATURE_DYN_MEM_V2))
+		pseries_rewrite_dynamic_memory_v2();
+#ifdef CONFIG_MEMORY_HOTPLUG
 	if (firmware_has_feature(FW_FEATURE_LPAR))
 		of_reconfig_notifier_register(&pseries_mem_nb);
+#endif /* CONFIG_MEMORY_HOTPLUG */
 
 	return 0;
 }

@@ -5,14 +5,14 @@ obj-y			:= lpar.o hvCall.o nvram.o reconfig.o \
 			   of_helpers.o \
 			   setup.o iommu.o event_sources.o ras.o \
 			   firmware.o power.o dlpar.o mobility.o rng.o \
-			   pci.o pci_dlpar.o eeh_pseries.o msi.o
+			   pci.o pci_dlpar.o eeh_pseries.o msi.o \
+			   hotplug-memory.o
 obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_SCANLOG)	+= scanlog.o
 obj-$(CONFIG_KEXEC)	+= kexec.o
 obj-$(CONFIG_PSERIES_ENERGY)	+= pseries_energy.o
 
 obj-$(CONFIG_HOTPLUG_CPU)	+= hotplug-cpu.o
-obj-$(CONFIG_MEMORY_HOTPLUG)	+= hotplug-memory.o
 
 obj-$(CONFIG_HVC_CONSOLE)	+= hvconsole.o
 obj-$(CONFIG_HVCS)		+= hvcserver.o

@@ -35,10 +35,68 @@ static int sysfs_entries;
 
 /* Helper Routines to convert between drc_index to cpu numbers */
 
+void read_one_drc_info(int **info, char **dtype, char **dname,
+			unsigned long int *fdi_p, unsigned long int *nsl_p,
+			unsigned long int *si_p, unsigned long int *ldi_p)
+{
+	char *drc_type, *drc_name, *pc;
+	u32 fdi, nsl, si, ldi;
+
+	fdi = nsl = si = ldi = 0;
+
+	/* Get drc-type:encode-string */
+	pc = (char *)info;
+	drc_type = pc;
+	pc += (strlen(drc_type) + 1);
+
+	/* Get drc-name-prefix:encode-string */
+	drc_name = (char *)pc;
+	pc += (strlen(drc_name) + 1);
+
+	/* Get drc-index-start:encode-int */
+	memcpy(&fdi, pc, 4);
+	fdi = be32_to_cpu(fdi);
+	pc += 4;
+
+	/* Get/skip drc-name-suffix-start:encode-int */
+	pc += 4;
+
+	/* Get number-sequential-elements:encode-int */
+	memcpy(&nsl, pc, 4);
+	nsl = be32_to_cpu(nsl);
+	pc += 4;
+
+	/* Get sequential-increment:encode-int */
+	memcpy(&si, pc, 4);
+	si = be32_to_cpu(si);
+	pc += 4;
+
+	/* Get/skip drc-power-domain:encode-int */
+	pc += 4;
+
+	/* Should now know end of current entry */
+	ldi = fdi + ((nsl-1)*si);
+
+	(*info) = (int *)pc;
+
+	if (dtype)
+		*dtype = drc_type;
+	if (dname)
+		*dname = drc_name;
+	if (fdi_p)
+		*fdi_p = fdi;
+	if (nsl_p)
+		*nsl_p = nsl;
+	if (si_p)
+		*si_p = si;
+	if (ldi_p)
+		*ldi_p = ldi;
+}
+EXPORT_SYMBOL(read_one_drc_info);
+
 static u32 cpu_to_drc_index(int cpu)
 {
 	struct device_node *dn = NULL;
-	const int *indexes;
 	int i;
 	int rc = 1;
 	u32 ret = 0;

@@ -46,18 +104,54 @@ static u32 cpu_to_drc_index(int cpu)
 	dn = of_find_node_by_path("/cpus");
 	if (dn == NULL)
 		goto err;
-	indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
-	if (indexes == NULL)
-		goto err_of_node_put;
+
 	/* Convert logical cpu number to core number */
 	i = cpu_core_index_of_thread(cpu);
-	/*
-	 * The first element indexes[0] is the number of drc_indexes
-	 * returned in the list.  Hence i+1 will get the drc_index
-	 * corresponding to core number i.
-	 */
-	WARN_ON(i > indexes[0]);
-	ret = indexes[i + 1];
+
+	if (firmware_has_feature(FW_FEATURE_DRC_INFO)) {
+		int *info = (int *)4;
+		unsigned long int num_set_entries, j, iw = i, fdi = 0;
+		unsigned long int ldi = 0, nsl = 0, si = 0;
+		char *dtype;
+		char *dname;
+
+		info = (int *)of_get_property(dn, "ibm,drc-info", NULL);
+		if (info == NULL)
+			goto err_of_node_put;
+
+		num_set_entries = be32_to_cpu(*info++);
+
+		for (j = 0; j < num_set_entries; j++) {
+
+			read_one_drc_info(&info, &dtype, &dname, &fdi,
+					&nsl, &si, &ldi);
+			if (strcmp(dtype, "CPU"))
+				goto err;
+
+			if (iw < ldi)
+				break;
+
+			WARN_ON(((iw-fdi)%si) != 0);
+		}
+		WARN_ON((nsl == 0) | (si == 0));
+
+		ret = ldi + (iw*si);
+	} else {
+		const int *indexes;
+
+		indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
+		if (indexes == NULL)
+			goto err_of_node_put;
+
+		/*
+		 * The first element indexes[0] is the number of drc_indexes
+		 * returned in the list.  Hence i+1 will get the drc_index
+		 * corresponding to core number i.
+		 */
+		WARN_ON(i > indexes[0]);
+		ret = indexes[i + 1];
+	}
+
 	rc = 0;
 
 err_of_node_put:

@@ -78,21 +172,51 @@ static int drc_index_to_cpu(u32 drc_index)
 	dn = of_find_node_by_path("/cpus");
 	if (dn == NULL)
 		goto err;
-	indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
-	if (indexes == NULL)
-		goto err_of_node_put;
-	/*
-	 * First element in the array is the number of drc_indexes
-	 * returned.  Search through the list to find the matching
-	 * drc_index and get the core number
-	 */
-	for (i = 0; i < indexes[0]; i++) {
-		if (indexes[i + 1] == drc_index)
+
+	if (firmware_has_feature(FW_FEATURE_DRC_INFO)) {
+		int *info = (int *)dn;
+		unsigned long int num_set_entries, j, ret;
+		unsigned long int fdi = 0, ldi = 0, nsl = 0, si = 0;
+		char *dtype, *dname;
+
+		info = (int *)of_get_property(dn, "ibm,drc-info", NULL);
+		if (info == NULL)
+			goto err_of_node_put;
+
+		num_set_entries = be32_to_cpu(*info++);
+
+		for (j = 0; j < num_set_entries; j++) {
+			read_one_drc_info(&info, &dtype, &dname, &fdi,
+					&nsl, &si, &ldi);
+			if (strcmp(dtype, "CPU"))
+				goto err;
+
+			WARN_ON(drc_index < fdi);
+			if (drc_index > ldi)
+				continue;
+
+			WARN_ON(((drc_index-fdi)%si) != 0);
+
+			ret = ((drc_index-fdi)/si);
 			break;
+		}
+	} else {
+		indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
+		if (indexes == NULL)
+			goto err_of_node_put;
+		/*
+		 * First element in the array is the number of drc_indexes
+		 * returned.  Search through the list to find the matching
+		 * drc_index and get the core number
+		 */
+		for (i = 0; i < indexes[0]; i++) {
+			if (indexes[i + 1] == drc_index)
+				break;
+		}
+		/* Convert core number to logical cpu number */
+		cpu = cpu_first_thread_of_core(i);
+		rc = 0;
 	}
-	/* Convert core number to logical cpu number */
-	cpu = cpu_first_thread_of_core(i);
-	rc = 0;
 
 err_of_node_put:
 	of_node_put(dn);

@@ -27,6 +27,7 @@
 #include <linux/mutex.h>
 #include <asm/rtas.h>
 #include <asm/vio.h>
+#include <linux/firmware.h>
 
 #include "../pci.h"
 #include "rpaphp.h"

@@ -44,15 +45,14 @@ static struct device_node *find_vio_slot_node(char *drc_name)
 {
 	struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
 	struct device_node *dn = NULL;
-	char *name;
 	int rc;
 
 	if (!parent)
 		return NULL;
 
 	while ((dn = of_get_next_child(parent, dn))) {
-		rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
-		if ((rc == 0) && (!strcmp(drc_name, name)))
+		rc = rpaphp_check_drc_props(dn, drc_name, NULL);
+		if (rc == 0)
 			break;
 	}
 

@@ -64,15 +64,12 @@ static struct device_node *find_php_slot_pci_node(char *drc_name,
 						  char *drc_type)
 {
 	struct device_node *np = NULL;
-	char *name;
-	char *type;
 	int rc;
 
 	while ((np = of_find_node_by_name(np, "pci"))) {
-		rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
+		rc = rpaphp_check_drc_props(np, drc_name, drc_type);
 		if (rc == 0)
-			if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
-				break;
+			break;
 	}
 
 	return np;

@@ -91,8 +91,8 @@ int rpaphp_get_sensor_state(struct slot *slot, int *state);
 
 /* rpaphp_core.c */
 int rpaphp_add_slot(struct device_node *dn);
-int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
-		char **drc_name, char **drc_type, int *drc_power_domain);
+int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
+		char *drc_type);
 
 /* rpaphp_slot.c */
 void dealloc_slot_struct(struct slot *slot);