MIPS: Add NUMA support for Loongson-3

Multiple Loongson-3A chips can be interconnected with HT0-bus. This is
a CC-NUMA system that every chip (node) has its own local memory and
cache coherency is maintained by hardware. The 64-bit physical memory
address format is as follows:

0x-0000-YZZZ-ZZZZ-ZZZZ

The high 16 bits should be 0, which means the real physical address
supported by Loongson-3 is 48-bit. The "Y" bits is the base address of
each node, which can be also considered as the node-id. The "Z" bits is
the address offset within a node, which means every node has a 44 bits
address space.

Macros XPHYSADDR and MAX_PHYSMEM_BITS are modified unconditionally,
because many other MIPS CPUs have also extended their address spaces.
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/7187/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/addrspace.h

@@ -52,7 +52,7 @@
  */
 #define CPHYSADDR(a)		((_ACAST32_(a)) & 0x1fffffff)
 #define XPHYSADDR(a)		((_ACAST64_(a)) &			\
-				 _CONST64_(0x000000ffffffffff))
+				 _CONST64_(0x0000ffffffffffff))
 
 #ifdef CONFIG_64BIT
 

arch/mips/include/asm/mach-loongson/boot_param.h

@@ -146,6 +146,9 @@ struct boot_params {
 
 struct loongson_system_configuration {
 	u32 nr_cpus;
+	u32 nr_nodes;
+	int cores_per_node;
+	int cores_per_package;
 	enum loongson_cpu_type cputype;
 	u64 ht_control_base;
 	u64 pci_mem_start_addr;

arch/mips/include/asm/mach-loongson/kernel-entry-init.h

+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Embedded Alley Solutions, Inc
+ * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2009 Jiajie Chen (chenjiajie@cse.buaa.edu.cn)
+ * Copyright (C) 2012 Huacai Chen (chenhc@lemote.com)
+ */
+#ifndef __ASM_MACH_LOONGSON_KERNEL_ENTRY_H
+#define __ASM_MACH_LOONGSON_KERNEL_ENTRY_H
+
+/*
+ * Override macros used in arch/mips/kernel/head.S.
+ */
+	.macro	kernel_entry_setup
+#ifdef CONFIG_CPU_LOONGSON3
+	.set	push
+	.set	mips64
+	/* Set LPA on LOONGSON3 config3 */
+	mfc0	t0, $16, 3
+	or	t0, (0x1 << 7)
+	mtc0	t0, $16, 3
+	/* Set ELPA on LOONGSON3 pagegrain */
+	li	t0, (0x1 << 29)
+	mtc0	t0, $5, 1
+	_ehb
+	.set	pop
+#endif
+	.endm
+
+/*
+ * Do SMP slave processor setup.
+ */
+	.macro	smp_slave_setup
+#ifdef CONFIG_CPU_LOONGSON3
+	.set	push
+	.set	mips64
+	/* Set LPA on LOONGSON3 config3 */
+	mfc0	t0, $16, 3
+	or	t0, (0x1 << 7)
+	mtc0	t0, $16, 3
+	/* Set ELPA on LOONGSON3 pagegrain */
+	li	t0, (0x1 << 29)
+	mtc0	t0, $5, 1
+	_ehb
+	.set	pop
+#endif
+	.endm
+
+#endif /* __ASM_MACH_LOONGSON_KERNEL_ENTRY_H */

arch/mips/include/asm/mach-loongson/mmzone.h

+/*
+ * Copyright (C) 2010 Loongson Inc. & Lemote Inc. &
+ *                    Insititute of Computing Technology
+ * Author:  Xiang Gao, gaoxiang@ict.ac.cn
+ *          Huacai Chen, chenhc@lemote.com
+ *          Xiaofu Meng, Shuangshuang Zhang
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#ifndef _ASM_MACH_MMZONE_H
+#define _ASM_MACH_MMZONE_H
+
+#include <boot_param.h>
+#define NODE_ADDRSPACE_SHIFT 44
+#define NODE0_ADDRSPACE_OFFSET 0x000000000000UL
+#define NODE1_ADDRSPACE_OFFSET 0x100000000000UL
+#define NODE2_ADDRSPACE_OFFSET 0x200000000000UL
+#define NODE3_ADDRSPACE_OFFSET 0x300000000000UL
+
+#define pa_to_nid(addr)  (((addr) & 0xf00000000000) >> NODE_ADDRSPACE_SHIFT)
+
+#define LEVELS_PER_SLICE 128
+
+struct slice_data {
+	unsigned long irq_enable_mask[2];
+	int level_to_irq[LEVELS_PER_SLICE];
+};
+
+struct hub_data {
+	cpumask_t	h_cpus;
+	unsigned long slice_map;
+	unsigned long irq_alloc_mask[2];
+	struct slice_data slice[2];
+};
+
+struct node_data {
+	struct pglist_data pglist;
+	struct hub_data hub;
+	cpumask_t cpumask;
+};
+
+extern struct node_data *__node_data[];
+
+#define NODE_DATA(n)		(&__node_data[(n)]->pglist)
+#define hub_data(n)		(&__node_data[(n)]->hub)
+
+extern void setup_zero_pages(void);
+extern void __init prom_init_numa_memory(void);
+
+#endif /* _ASM_MACH_MMZONE_H */

arch/mips/include/asm/mach-loongson/topology.h

+#ifndef _ASM_MACH_TOPOLOGY_H
+#define _ASM_MACH_TOPOLOGY_H
+
+#ifdef CONFIG_NUMA
+
+#define cpu_to_node(cpu)	((cpu) >> 2)
+#define parent_node(node)	(node)
+#define cpumask_of_node(node)	(&__node_data[(node)]->cpumask)
+
+struct pci_bus;
+extern int pcibus_to_node(struct pci_bus *);
+
+#define cpumask_of_pcibus(bus)	(cpu_online_mask)
+
+extern unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
+
+#define node_distance(from, to)	(__node_distances[(from)][(to)])
+
+#endif
+
+#include <asm-generic/topology.h>
+
+#endif /* _ASM_MACH_TOPOLOGY_H */

arch/mips/include/asm/sparsemem.h

@@ -11,7 +11,7 @@
 #else
 # define SECTION_SIZE_BITS	28
 #endif
-#define MAX_PHYSMEM_BITS	35
+#define MAX_PHYSMEM_BITS	48
 
 #endif /* CONFIG_SPARSEMEM */
 #endif /* _MIPS_SPARSEMEM_H */

arch/mips/kernel/setup.c

@@ -282,7 +282,7 @@ static unsigned long __init init_initrd(void)
  * Initialize the bootmem allocator. It also setup initrd related data
  * if needed.
  */
-#ifdef CONFIG_SGI_IP27
+#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 
 static void __init bootmem_init(void)
 {

arch/mips/loongson/Kconfig

@@ -79,6 +79,7 @@ config LEMOTE_MACH3A
 	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_SMP
 	select SYS_SUPPORTS_HOTPLUG_CPU
+	select SYS_SUPPORTS_NUMA
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_HIGHMEM
 	select SYS_SUPPORTS_LITTLE_ENDIAN

arch/mips/loongson/common/env.c

@@ -80,17 +80,24 @@ void __init prom_init_env(void)
 	cpu_clock_freq = ecpu->cpu_clock_freq;
 	loongson_sysconf.cputype = ecpu->cputype;
 	if (ecpu->cputype == Loongson_3A) {
+		loongson_sysconf.cores_per_node = 4;
+		loongson_sysconf.cores_per_package = 4;
 		loongson_chipcfg[0] = 0x900000001fe00180;
 		loongson_chipcfg[1] = 0x900010001fe00180;
 		loongson_chipcfg[2] = 0x900020001fe00180;
 		loongson_chipcfg[3] = 0x900030001fe00180;
 	} else {
+		loongson_sysconf.cores_per_node = 1;
+		loongson_sysconf.cores_per_package = 1;
 		loongson_chipcfg[0] = 0x900000001fe00180;
 	}
 
 	loongson_sysconf.nr_cpus = ecpu->nr_cpus;
 	if (ecpu->nr_cpus > NR_CPUS || ecpu->nr_cpus == 0)
 		loongson_sysconf.nr_cpus = NR_CPUS;
+	loongson_sysconf.nr_nodes = (loongson_sysconf.nr_cpus +
+		loongson_sysconf.cores_per_node - 1) /
+		loongson_sysconf.cores_per_node;
 
 	loongson_sysconf.pci_mem_start_addr = eirq_source->pci_mem_start_addr;
 	loongson_sysconf.pci_mem_end_addr = eirq_source->pci_mem_end_addr;

arch/mips/loongson/common/init.c

@@ -30,7 +30,11 @@ void __init prom_init(void)
 	set_io_port_base((unsigned long)
 		ioremap(LOONGSON_PCIIO_BASE, LOONGSON_PCIIO_SIZE));
 
+#ifdef CONFIG_NUMA
+	prom_init_numa_memory();
+#else
 	prom_init_memory();
+#endif
 
 	/*init the uart base address */
 	prom_init_uart_base();

arch/mips/loongson/loongson-3/Makefile

@@ -4,3 +4,5 @@
 obj-y			+= irq.o
 
 obj-$(CONFIG_SMP)	+= smp.o
+
+obj-$(CONFIG_NUMA)	+= numa.o

arch/mips/loongson/loongson-3/numa.c

+/*
+ * Copyright (C) 2010 Loongson Inc. & Lemote Inc. &
+ *                    Insititute of Computing Technology
+ * Author:  Xiang Gao, gaoxiang@ict.ac.cn
+ *          Huacai Chen, chenhc@lemote.com
+ *          Xiaofu Meng, Shuangshuang Zhang
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/mmzone.h>
+#include <linux/module.h>
+#include <linux/nodemask.h>
+#include <linux/swap.h>
+#include <linux/memblock.h>
+#include <linux/bootmem.h>
+#include <linux/pfn.h>
+#include <linux/highmem.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/sections.h>
+#include <linux/bootmem.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/bootinfo.h>
+#include <asm/mc146818-time.h>
+#include <asm/time.h>
+#include <asm/wbflush.h>
+#include <boot_param.h>
+
+static struct node_data prealloc__node_data[MAX_NUMNODES];
+unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
+struct node_data *__node_data[MAX_NUMNODES];
+EXPORT_SYMBOL(__node_data);
+
+static void enable_lpa(void)
+{
+	unsigned long value;
+
+	value = __read_32bit_c0_register($16, 3);
+	value |= 0x00000080;
+	__write_32bit_c0_register($16, 3, value);
+	value = __read_32bit_c0_register($16, 3);
+	pr_info("CP0_Config3: CP0 16.3 (0x%lx)\n", value);
+
+	value = __read_32bit_c0_register($5, 1);
+	value |= 0x20000000;
+	__write_32bit_c0_register($5, 1, value);
+	value = __read_32bit_c0_register($5, 1);
+	pr_info("CP0_PageGrain: CP0 5.1 (0x%lx)\n", value);
+}
+
+static void cpu_node_probe(void)
+{
+	int i;
+
+	nodes_clear(node_possible_map);
+	nodes_clear(node_online_map);
+	for (i = 0; i < loongson_sysconf.nr_nodes; i++) {
+		node_set_state(num_online_nodes(), N_POSSIBLE);
+		node_set_online(num_online_nodes());
+	}
+
+	pr_info("NUMA: Discovered %d cpus on %d nodes\n",
+		loongson_sysconf.nr_cpus, num_online_nodes());
+}
+
+static int __init compute_node_distance(int row, int col)
+{
+	int package_row = row * loongson_sysconf.cores_per_node /
+				loongson_sysconf.cores_per_package;
+	int package_col = col * loongson_sysconf.cores_per_node /
+				loongson_sysconf.cores_per_package;
+
+	if (col == row)
+		return 0;
+	else if (package_row == package_col)
+		return 40;
+	else
+		return 100;
+}
+
+static void __init init_topology_matrix(void)
+{
+	int row, col;
+
+	for (row = 0; row < MAX_NUMNODES; row++)
+		for (col = 0; col < MAX_NUMNODES; col++)
+			__node_distances[row][col] = -1;
+
+	for_each_online_node(row) {
+		for_each_online_node(col) {
+			__node_distances[row][col] =
+				compute_node_distance(row, col);
+		}
+	}
+}
+
+static unsigned long nid_to_addroffset(unsigned int nid)
+{
+	unsigned long result;
+	switch (nid) {
+	case 0:
+	default:
+		result = NODE0_ADDRSPACE_OFFSET;
+		break;
+	case 1:
+		result = NODE1_ADDRSPACE_OFFSET;
+		break;
+	case 2:
+		result = NODE2_ADDRSPACE_OFFSET;
+		break;
+	case 3:
+		result = NODE3_ADDRSPACE_OFFSET;
+		break;
+	}
+	return result;
+}
+
+static void __init szmem(unsigned int node)
+{
+	u32 i, mem_type;
+	static unsigned long num_physpages = 0;
+	u64 node_id, node_psize, start_pfn, end_pfn, mem_start, mem_size;
+
+	/* Parse memory information and activate */
+	for (i = 0; i < loongson_memmap->nr_map; i++) {
+		node_id = loongson_memmap->map[i].node_id;
+		if (node_id != node)
+			continue;
+
+		mem_type = loongson_memmap->map[i].mem_type;
+		mem_size = loongson_memmap->map[i].mem_size;
+		mem_start = loongson_memmap->map[i].mem_start;
+
+		switch (mem_type) {
+		case SYSTEM_RAM_LOW:
+			start_pfn = ((node_id << 44) + mem_start) >> PAGE_SHIFT;
+			node_psize = (mem_size << 20) >> PAGE_SHIFT;
+			end_pfn  = start_pfn + node_psize;
+			num_physpages += node_psize;
+			pr_info("Node%d: mem_type:%d, mem_start:0x%llx, mem_size:0x%llx MB\n",
+				(u32)node_id, mem_type, mem_start, mem_size);
+			pr_info("       start_pfn:0x%llx, end_pfn:0x%llx, num_physpages:0x%lx\n",
+				start_pfn, end_pfn, num_physpages);
+			add_memory_region((node_id << 44) + mem_start,
+				(u64)mem_size << 20, BOOT_MEM_RAM);
+			memblock_add_node(PFN_PHYS(start_pfn),
+				PFN_PHYS(end_pfn - start_pfn), node);
+			break;
+		case SYSTEM_RAM_HIGH:
+			start_pfn = ((node_id << 44) + mem_start) >> PAGE_SHIFT;
+			node_psize = (mem_size << 20) >> PAGE_SHIFT;
+			end_pfn  = start_pfn + node_psize;
+			num_physpages += node_psize;
+			pr_info("Node%d: mem_type:%d, mem_start:0x%llx, mem_size:0x%llx MB\n",
+				(u32)node_id, mem_type, mem_start, mem_size);
+			pr_info("       start_pfn:0x%llx, end_pfn:0x%llx, num_physpages:0x%lx\n",
+				start_pfn, end_pfn, num_physpages);
+			add_memory_region((node_id << 44) + mem_start,
+				(u64)mem_size << 20, BOOT_MEM_RAM);
+			memblock_add_node(PFN_PHYS(start_pfn),
+				PFN_PHYS(end_pfn - start_pfn), node);
+			break;
+		case MEM_RESERVED:
+			pr_info("Node%d: mem_type:%d, mem_start:0x%llx, mem_size:0x%llx MB\n",
+				(u32)node_id, mem_type, mem_start, mem_size);
+			add_memory_region((node_id << 44) + mem_start,
+				(u64)mem_size << 20, BOOT_MEM_RESERVED);
+			memblock_reserve(((node_id << 44) + mem_start),
+				mem_size << 20);
+			break;
+		}
+	}
+}
+
+static void __init node_mem_init(unsigned int node)
+{
+	unsigned long bootmap_size;
+	unsigned long node_addrspace_offset;
+	unsigned long start_pfn, end_pfn, freepfn;
+
+	node_addrspace_offset = nid_to_addroffset(node);
+	pr_info("Node%d's addrspace_offset is 0x%lx\n",
+			node, node_addrspace_offset);
+
+	get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
+	freepfn = start_pfn;
+	if (node == 0)
+		freepfn = PFN_UP(__pa_symbol(&_end)); /* kernel end address */
+	pr_info("Node%d: start_pfn=0x%lx, end_pfn=0x%lx, freepfn=0x%lx\n",
+		node, start_pfn, end_pfn, freepfn);
+
+	__node_data[node] = prealloc__node_data + node;
+
+	NODE_DATA(node)->bdata = &bootmem_node_data[node];
+	NODE_DATA(node)->node_start_pfn = start_pfn;
+	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
+
+	bootmap_size = init_bootmem_node(NODE_DATA(node), freepfn,
+					start_pfn, end_pfn);
+	free_bootmem_with_active_regions(node, end_pfn);
+	if (node == 0) /* used by finalize_initrd() */
+		max_low_pfn = end_pfn;
+
+	/* This is reserved for the kernel and bdata->node_bootmem_map */
+	reserve_bootmem_node(NODE_DATA(node), start_pfn << PAGE_SHIFT,
+		((freepfn - start_pfn) << PAGE_SHIFT) + bootmap_size,
+		BOOTMEM_DEFAULT);
+
+	if (node == 0 && node_end_pfn(0) >= (0xffffffff >> PAGE_SHIFT)) {
+		/* Reserve 0xff800000~0xffffffff for RS780E integrated GPU */
+		reserve_bootmem_node(NODE_DATA(node),
+				(node_addrspace_offset | 0xff800000),
+				8 << 20, BOOTMEM_DEFAULT);
+	}
+
+	sparse_memory_present_with_active_regions(node);
+}
+
+static __init void prom_meminit(void)
+{
+	unsigned int node, cpu;
+
+	cpu_node_probe();
+	init_topology_matrix();
+
+	for (node = 0; node < loongson_sysconf.nr_nodes; node++) {
+		if (node_online(node)) {
+			szmem(node);
+			node_mem_init(node);
+			cpus_clear(__node_data[(node)]->cpumask);
+		}
+	}
+	for (cpu = 0; cpu < loongson_sysconf.nr_cpus; cpu++) {
+		node = cpu / loongson_sysconf.cores_per_node;
+		if (node >= num_online_nodes())
+			node = 0;
+		pr_info("NUMA: set cpumask cpu %d on node %d\n", cpu, node);
+		cpu_set(cpu, __node_data[(node)]->cpumask);
+	}
+}
+
+void __init paging_init(void)
+{
+	unsigned node;
+	unsigned long zones_size[MAX_NR_ZONES] = {0, };
+
+	pagetable_init();
+
+	for_each_online_node(node) {
+		unsigned long  start_pfn, end_pfn;
+
+		get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
+
+		if (end_pfn > max_low_pfn)
+			max_low_pfn = end_pfn;
+	}
+#ifdef CONFIG_ZONE_DMA32
+	zones_size[ZONE_DMA32] = MAX_DMA32_PFN;
+#endif
+	zones_size[ZONE_NORMAL] = max_low_pfn;
+	free_area_init_nodes(zones_size);
+}
+
+void __init mem_init(void)
+{
+	high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
+	free_all_bootmem();
+	setup_zero_pages();	/* This comes from node 0 */
+	mem_init_print_info(NULL);
+}
+
+/* All PCI device belongs to logical Node-0 */
+int pcibus_to_node(struct pci_bus *bus)
+{
+	return 0;
+}
+EXPORT_SYMBOL(pcibus_to_node);
+
+void __init prom_init_numa_memory(void)
+{
+	enable_lpa();
+	prom_meminit();
+}
+EXPORT_SYMBOL(prom_init_numa_memory);

arch/mips/loongson/loongson-3/smp.c

@@ -203,6 +203,8 @@ static void loongson3_init_secondary(void)
 	for (i = 0; i < loongson_sysconf.nr_cpus; i++)
 		loongson3_ipi_write32(0xffffffff, ipi_en0_regs[i]);
 
+	cpu_data[cpu].package = cpu / loongson_sysconf.cores_per_package;
+	cpu_data[cpu].core = cpu % loongson_sysconf.cores_per_package;
 	per_cpu(cpu_state, cpu) = CPU_ONLINE;
 
 	i = 0;
@@ -394,17 +396,19 @@ static int loongson3_cpu_callback(struct notifier_block *nfb,
 	unsigned long action, void *hcpu)
 {
 	unsigned int cpu = (unsigned long)hcpu;
+	uint64_t core_id = cpu_data[cpu].core;
+	uint64_t package_id = cpu_data[cpu].package;
 
 	switch (action) {
 	case CPU_POST_DEAD:
 	case CPU_POST_DEAD_FROZEN:
 		pr_info("Disable clock for CPU#%d\n", cpu);
-		LOONGSON_CHIPCFG(0) &= ~(1 << (12 + cpu));
+		LOONGSON_CHIPCFG(package_id) &= ~(1 << (12 + core_id));
 		break;
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
 		pr_info("Enable clock for CPU#%d\n", cpu);
-		LOONGSON_CHIPCFG(0) |= 1 << (12 + cpu);
+		LOONGSON_CHIPCFG(package_id) |= 1 << (12 + core_id);
 		break;
 	}