x86/platform/UV: Fold blade info into per node hub info structs

Migrate references from the blade info structs to the per node hub info
structs.  This phases out the allocation of the list of per blade info
structs on node 0, in favor of a per node hub info struct allocated on
the node's local memory.

There are also some minor cosemetic changes in the comments and whitespace
to clean things up a bit.

Tested-by: Dimitri Sivanich <sivanich@sgi.com>
Tested-by: John Estabrook <estabrook@sgi.com>
Tested-by: Gary Kroening <gfk@sgi.com>
Tested-by: Nathan Zimmer <nzimmer@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Reviewed-by: Andrew Banman <abanman@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <rja@sgi.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160429215404.987204515@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/uv/uv_hub.h

@@ -16,6 +16,7 @@
 #include <linux/percpu.h>
 #include <linux/timer.h>
 #include <linux/io.h>
+#include <linux/topology.h>
 #include <asm/types.h>
 #include <asm/percpu.h>
 #include <asm/uv/uv_mmrs.h>
@@ -161,6 +162,9 @@ struct uv_hub_info_s {
 	unsigned short		numa_blade_id;
 	unsigned char		m_val;
 	unsigned char		n_val;
+	unsigned short		nr_possible_cpus;
+	unsigned short		nr_online_cpus;
+	short			memory_nid;
 };
 
 /* CPU specific info with a pointer to the hub common info struct */
@@ -446,7 +450,7 @@ static inline unsigned long uv_gpa_to_soc_phys_ram(unsigned long gpa)
 }
 
 
-/* gpa -> pnode */
+/* gpa -> gnode */
 static inline unsigned long uv_gpa_to_gnode(unsigned long gpa)
 {
 	return gpa >> uv_hub_info->n_lshift;
@@ -455,12 +459,10 @@ static inline unsigned long uv_gpa_to_gnode(unsigned long gpa)
 /* gpa -> pnode */
 static inline int uv_gpa_to_pnode(unsigned long gpa)
 {
-	unsigned long n_mask = (1UL << uv_hub_info->n_val) - 1;
-
-	return uv_gpa_to_gnode(gpa) & n_mask;
+	return uv_gpa_to_gnode(gpa) & uv_hub_info->pnode_mask;
 }
 
-/* gpa -> node offset*/
+/* gpa -> node offset */
 static inline unsigned long uv_gpa_to_offset(unsigned long gpa)
 {
 	return (gpa << uv_hub_info->m_shift) >> uv_hub_info->m_shift;
@@ -472,18 +474,13 @@ static inline void *uv_pnode_offset_to_vaddr(int pnode, unsigned long offset)
 	return __va(((unsigned long)pnode << uv_hub_info->m_val) | offset);
 }
 
-
-/*
- * Extract a PNODE from an APICID (full apicid, not processor subset)
- */
+/* Extract a PNODE from an APICID (full apicid, not processor subset) */
 static inline int uv_apicid_to_pnode(int apicid)
 {
 	return (apicid >> uv_hub_info->apic_pnode_shift);
 }
 
-/*
- * Convert an apicid to the socket number on the blade
- */
+/* Convert an apicid to the socket number on the blade */
 static inline int uv_apicid_to_socket(int apicid)
 {
 	if (is_uv1_hub())
@@ -581,21 +578,6 @@ static inline void uv_write_local_mmr8(unsigned long offset, unsigned char val)
 	writeb(val, uv_local_mmr_address(offset));
 }
 
-/*
- * Structures and definitions for converting between cpu, node, pnode, and blade
- * numbers.
- */
-struct uv_blade_info {
-	unsigned short	nr_possible_cpus;
-	unsigned short	nr_online_cpus;
-	unsigned short	pnode;
-	short		memory_nid;
-};
-extern struct uv_blade_info *uv_blade_info;
-extern short *uv_node_to_blade;
-extern short *uv_cpu_to_blade;
-extern short uv_possible_blades;
-
 /* Blade-local cpu number of current cpu. Numbered 0 .. <# cpus on the blade> */
 static inline int uv_blade_processor_id(void)
 {
@@ -609,61 +591,72 @@ static inline int uv_cpu_blade_processor_id(int cpu)
 }
 #define _uv_cpu_blade_processor_id 1	/* indicate function available */
 
+/* Blade number to Node number (UV1..UV4 is 1:1) */
+static inline int uv_blade_to_node(int blade)
+{
+	return blade;
+}
+
 /* Blade number of current cpu. Numnbered 0 .. <#blades -1> */
 static inline int uv_numa_blade_id(void)
 {
 	return uv_hub_info->numa_blade_id;
 }
 
-/* Convert a cpu number to the the UV blade number */
-static inline int uv_cpu_to_blade_id(int cpu)
+/*
+ * Convert linux node number to the UV blade number.
+ * .. Currently for UV1 thru UV4 the node and the blade are identical.
+ * .. If this changes then you MUST check references to this function!
+ */
+static inline int uv_node_to_blade_id(int nid)
 {
-	return uv_cpu_to_blade[cpu];
+	return nid;
 }
 
-/* Convert linux node number to the UV blade number */
-static inline int uv_node_to_blade_id(int nid)
+/* Convert a cpu number to the the UV blade number */
+static inline int uv_cpu_to_blade_id(int cpu)
 {
-	return uv_node_to_blade[nid];
+	return uv_node_to_blade_id(cpu_to_node(cpu));
 }
 
 /* Convert a blade id to the PNODE of the blade */
 static inline int uv_blade_to_pnode(int bid)
 {
-	return uv_blade_info[bid].pnode;
+	return uv_hub_info_list(uv_blade_to_node(bid))->pnode;
 }
 
 /* Nid of memory node on blade. -1 if no blade-local memory */
 static inline int uv_blade_to_memory_nid(int bid)
 {
-	return uv_blade_info[bid].memory_nid;
+	return uv_hub_info_list(uv_blade_to_node(bid))->memory_nid;
 }
 
 /* Determine the number of possible cpus on a blade */
 static inline int uv_blade_nr_possible_cpus(int bid)
 {
-	return uv_blade_info[bid].nr_possible_cpus;
+	return uv_hub_info_list(uv_blade_to_node(bid))->nr_possible_cpus;
 }
 
 /* Determine the number of online cpus on a blade */
 static inline int uv_blade_nr_online_cpus(int bid)
 {
-	return uv_blade_info[bid].nr_online_cpus;
+	return uv_hub_info_list(uv_blade_to_node(bid))->nr_online_cpus;
 }
 
 /* Convert a cpu id to the PNODE of the blade containing the cpu */
 static inline int uv_cpu_to_pnode(int cpu)
 {
-	return uv_blade_info[uv_cpu_to_blade_id(cpu)].pnode;
+	return uv_cpu_hub_info(cpu)->pnode;
 }
 
 /* Convert a linux node number to the PNODE of the blade */
 static inline int uv_node_to_pnode(int nid)
 {
-	return uv_blade_info[uv_node_to_blade_id(nid)].pnode;
+	return uv_hub_info_list(nid)->pnode;
 }
 
 /* Maximum possible number of blades */
+extern short uv_possible_blades;
 static inline int uv_num_possible_blades(void)
 {
 	return uv_possible_blades;

arch/x86/kernel/apic/x2apic_uv_x.c

@@ -238,21 +238,14 @@ EXPORT_SYMBOL_GPL(__uv_hub_info_list);
 DEFINE_PER_CPU(struct uv_cpu_info_s, __uv_cpu_info);
 EXPORT_PER_CPU_SYMBOL_GPL(__uv_cpu_info);
 
-struct uv_blade_info *uv_blade_info;
-EXPORT_SYMBOL_GPL(uv_blade_info);
-
-short *uv_node_to_blade;
-EXPORT_SYMBOL_GPL(uv_node_to_blade);
-
-short *uv_cpu_to_blade;
-EXPORT_SYMBOL_GPL(uv_cpu_to_blade);
-
 short uv_possible_blades;
 EXPORT_SYMBOL_GPL(uv_possible_blades);
 
 unsigned long sn_rtc_cycles_per_second;
 EXPORT_SYMBOL(sn_rtc_cycles_per_second);
 
+static __initdata unsigned short *_node_to_pnode;
+
 extern int uv_hub_info_version(void)
 {
 	return UV_HUB_INFO_VERSION;
@@ -385,7 +378,6 @@ static unsigned long set_apic_id(unsigned int id)
 
 static unsigned int uv_read_apic_id(void)
 {
-
 	return x2apic_get_apic_id(apic_read(APIC_ID));
 }
 
@@ -460,19 +452,6 @@ static void set_x2apic_extra_bits(int pnode)
 	__this_cpu_write(x2apic_extra_bits, pnode << uvh_apicid.s.pnode_shift);
 }
 
-/*
- * Called on boot cpu.
- */
-static __init int boot_pnode_to_blade(int pnode)
-{
-	int blade;
-
-	for (blade = 0; blade < uv_num_possible_blades(); blade++)
-		if (pnode == uv_blade_info[blade].pnode)
-			return blade;
-	BUG();
-}
-
 #define	UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_LENGTH	3
 #define DEST_SHIFT UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR_DEST_BASE_SHFT
 
@@ -889,10 +868,10 @@ int uv_set_vga_state(struct pci_dev *pdev, bool decode,
 void uv_cpu_init(void)
 {
 	/* CPU 0 initialization will be done via uv_system_init. */
-	if (!uv_blade_info)
+	if (smp_processor_id() == 0)
 		return;
 
-	uv_blade_info[uv_numa_blade_id()].nr_online_cpus++;
+	uv_hub_info->nr_online_cpus++;
 
 	if (get_uv_system_type() == UV_NON_UNIQUE_APIC)
 		set_x2apic_extra_bits(uv_hub_info->pnode);
@@ -976,11 +955,57 @@ void __init uv_init_hub_info(struct uv_hub_info_s *hub_info)
 
 }
 
+/*
+ * Setup physical blade translations from UVH_NODE_PRESENT_TABLE
+ * .. NB: UVH_NODE_PRESENT_TABLE is going away,
+ * .. being replaced by GAM Range Table
+ */
+static __init void boot_init_possible_blades(struct uv_hub_info_s *hub_info)
+{
+	size_t bytes;
+	int blade, i, j, uv_pb = 0, num_nodes = num_possible_nodes();
+
+	pr_info("UV: NODE_PRESENT_DEPTH = %d\n", UVH_NODE_PRESENT_TABLE_DEPTH);
+	for (i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++) {
+		unsigned long np;
+
+		np = uv_read_local_mmr(UVH_NODE_PRESENT_TABLE + i * 8);
+		if (np)
+			pr_info("UV: NODE_PRESENT(%d) = 0x%016lx\n", i, np);
+
+		uv_pb += hweight64(np);
+	}
+	if (uv_possible_blades != uv_pb)
+		uv_possible_blades = uv_pb;
+
+	bytes = num_nodes * sizeof(_node_to_pnode[0]);
+	_node_to_pnode = kmalloc(bytes, GFP_KERNEL);
+	BUG_ON(!_node_to_pnode);
+
+	for (blade = 0, i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++) {
+		unsigned short pnode;
+		unsigned long present =
+			uv_read_local_mmr(UVH_NODE_PRESENT_TABLE + i * 8);
+
+		for (j = 0; j < 64; j++) {
+			if (!test_bit(j, &present))
+				continue;
+			pnode = (i * 64 + j) & hub_info->pnode_mask;
+			_node_to_pnode[blade++] = pnode;
+		}
+		if (blade > num_nodes) {
+			pr_err("UV: blade count(%d) exceeds node count(%d)!\n",
+				blade, num_nodes);
+			BUG();
+		}
+	}
+}
+
 void __init uv_system_init(void)
 {
 	struct uv_hub_info_s hub_info = {0};
-	int bytes, nid, cpu, pnode, blade, i, j;
-	int min_pnode = 999999, max_pnode = -1;
+	int bytes, cpu, nodeid;
+	unsigned short min_pnode = 9999, max_pnode = 0;
 	char *hub = is_uv4_hub() ? "UV400" :
 		    is_uv3_hub() ? "UV300" :
 		    is_uv2_hub() ? "UV2000/3000" :
@@ -997,16 +1022,9 @@ void __init uv_system_init(void)
 		map_low_mmrs();
 
 	uv_init_hub_info(&hub_info);
-
-	pr_info("UV: NODE_PRESENT_DEPTH = %d\n", UVH_NODE_PRESENT_TABLE_DEPTH);
-	for (i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++) {
-		unsigned long np;
-
-		np = uv_read_local_mmr(UVH_NODE_PRESENT_TABLE + i * 8);
-		if (np)
-			pr_info("UV: NODE_PRESENT(%d) = 0x%016lx\n", i, np);
-		uv_possible_blades += hweight64(np);
-	}
+	uv_possible_blades = num_possible_nodes();
+	if (!_node_to_pnode)
+		boot_init_possible_blades(&hub_info);
 
 	/* uv_num_possible_blades() is really the hub count */
 	pr_info("UV: Found %d hubs, %d nodes, %d cpus\n",
@@ -1014,97 +1032,69 @@ void __init uv_system_init(void)
 			num_possible_nodes(),
 			num_possible_cpus());
 
-	bytes = sizeof(struct uv_blade_info) * uv_num_possible_blades();
-	uv_blade_info = kzalloc(bytes, GFP_KERNEL);
-	BUG_ON(!uv_blade_info);
-
-	for (blade = 0; blade < uv_num_possible_blades(); blade++)
-		uv_blade_info[blade].memory_nid = -1;
-
-
-	bytes = sizeof(uv_node_to_blade[0]) * num_possible_nodes();
-	uv_node_to_blade = kmalloc(bytes, GFP_KERNEL);
-	BUG_ON(!uv_node_to_blade);
-	memset(uv_node_to_blade, 255, bytes);
-
-	bytes = sizeof(uv_cpu_to_blade[0]) * num_possible_cpus();
-	uv_cpu_to_blade = kmalloc(bytes, GFP_KERNEL);
-	BUG_ON(!uv_cpu_to_blade);
-	memset(uv_cpu_to_blade, 255, bytes);
-
-	bytes = sizeof(void *) * uv_num_possible_blades();
-	__uv_hub_info_list = kzalloc(bytes, GFP_KERNEL);
-	BUG_ON(!__uv_hub_info_list);
-
-	blade = 0;
-	for (i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++) {
-		unsigned long present =
-			uv_read_local_mmr(UVH_NODE_PRESENT_TABLE + i * 8);
-		for (j = 0; j < 64; j++) {
-			if (!test_bit(j, &present))
-				continue;
-			pnode = (i * 64 + j) & hub_info.pnode_mask;
-			uv_blade_info[blade].pnode = pnode;
-			uv_blade_info[blade].nr_possible_cpus = 0;
-			uv_blade_info[blade].nr_online_cpus = 0;
-			min_pnode = min(pnode, min_pnode);
-			max_pnode = max(pnode, max_pnode);
-			blade++;
-		}
-	}
-
 	uv_bios_init();
 	uv_bios_get_sn_info(0, &uv_type, &sn_partition_id, &sn_coherency_id,
 			    &sn_region_size, &system_serial_number);
 	hub_info.coherency_domain_number = sn_coherency_id;
 	uv_rtc_init();
 
-	for_each_present_cpu(cpu) {
-		struct uv_hub_info_s *new_hub = NULL;
-		int apicid = per_cpu(x86_cpu_to_apicid, cpu);
-		int nodeid = cpu_to_node(cpu);
+	bytes = sizeof(void *) * uv_num_possible_blades();
+	__uv_hub_info_list = kzalloc(bytes, GFP_KERNEL);
+	BUG_ON(!__uv_hub_info_list);
 
-		/* Allocate new per hub info list */
-		if (uv_hub_info_list(nodeid) == NULL) {
-			if (cpu == 0)
-				__uv_hub_info_list[0] = &uv_hub_info_node0;
-			else
-				__uv_hub_info_list[nodeid] =
-					kzalloc_node(bytes, GFP_KERNEL, nodeid);
-
-			new_hub = uv_hub_info_list(nodeid);
-			BUG_ON(!new_hub);
-			*new_hub = hub_info;
-			blade = boot_pnode_to_blade(new_hub->pnode);
-			new_hub->pnode = uv_apicid_to_pnode(apicid);
-			new_hub->numa_blade_id = blade;
+	bytes = sizeof(struct uv_hub_info_s);
+	for_each_node(nodeid) {
+		struct uv_hub_info_s *new_hub;
+		unsigned short pnode;
+
+		if (__uv_hub_info_list[nodeid]) {
+			pr_err("UV: Node %d UV HUB already initialized!?\n",
+				nodeid);
+			BUG();
 		}
 
-		/* Any node on the blade, else will contain -1. */
-		uv_blade_info[blade].memory_nid = nodeid;
+		/* Allocate new per hub info list */
+		new_hub = (nodeid == 0) ?
+			&uv_hub_info_node0 :
+			kzalloc_node(bytes, GFP_KERNEL, nodeid);
+		BUG_ON(!new_hub);
+		__uv_hub_info_list[nodeid] = new_hub;
+		new_hub = uv_hub_info_list(nodeid);
+		BUG_ON(!new_hub);
+		*new_hub = hub_info;
+
+		pnode = _node_to_pnode[nodeid];
+		min_pnode = min(pnode, min_pnode);
+		max_pnode = max(pnode, max_pnode);
+		new_hub->pnode = pnode;
+		new_hub->numa_blade_id = uv_node_to_blade_id(nodeid);
+		new_hub->memory_nid = -1;
+		new_hub->nr_possible_cpus = 0;
+		new_hub->nr_online_cpus = 0;
+	}
 
-		uv_node_to_blade[nodeid] = blade;
-		uv_cpu_to_blade[cpu] = blade;
+	/* Initialize per cpu info */
+	for_each_possible_cpu(cpu) {
+		int apicid = per_cpu(x86_cpu_to_apicid, cpu);
 
-		/* Initialize per cpu info list */
+		nodeid = cpu_to_node(cpu);
 		uv_cpu_info_per(cpu)->p_uv_hub_info = uv_hub_info_list(nodeid);
-		uv_cpu_info_per(cpu)->scir.offset = uv_scir_offset(apicid);
 		uv_cpu_info_per(cpu)->blade_cpu_id =
-			uv_blade_info[blade].nr_possible_cpus++;
+			uv_cpu_hub_info(cpu)->nr_possible_cpus++;
+		if (uv_cpu_hub_info(cpu)->memory_nid == -1)
+			uv_cpu_hub_info(cpu)->memory_nid = cpu_to_node(cpu);
+		uv_cpu_scir_info(cpu)->offset = uv_scir_offset(apicid);
 	}
 
-	/* Add blade/pnode info for nodes without cpus */
-	for_each_online_node(nid) {
-		unsigned long paddr;
-
-		if (uv_node_to_blade[nid] >= 0)
-			continue;
-		paddr = node_start_pfn(nid) << PAGE_SHIFT;
-		pnode = uv_gpa_to_pnode(uv_soc_phys_ram_to_gpa(paddr));
-		blade = boot_pnode_to_blade(pnode);
-		uv_node_to_blade[nid] = blade;
+	/* Display per node info */
+	for_each_node(nodeid) {
+		pr_info("UV: UVHUB node:%2d pn:%02x nrcpus:%d\n",
+			nodeid,
+			uv_hub_info_list(nodeid)->pnode,
+			uv_hub_info_list(nodeid)->nr_possible_cpus);
 	}
 
+	pr_info("UV: min_pnode:%02x max_pnode:%02x\n", min_pnode, max_pnode);
 	map_gru_high(max_pnode);
 	map_mmr_high(max_pnode);
 	map_mmioh_high(min_pnode, max_pnode);