arch/x86/mm/amdtopology_64.c - kernel/msm-4.19 - Gitiles

 /*
  * AMD NUMA support.
  * Discover the memory map and associated nodes.
  *
  * This version reads it directly from the AMD northbridge.
  *
  * Copyright 2002,2003 Andi Kleen, SuSE Labs.
  */
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/string.h>
 #include <linux/module.h>
 #include <linux/nodemask.h>
 #include <linux/memblock.h>

 #include <asm/io.h>
 #include <linux/pci_ids.h>
 #include <linux/acpi.h>
 #include <asm/types.h>
 #include <asm/mmzone.h>
 #include <asm/proto.h>
 #include <asm/e820.h>
 #include <asm/pci-direct.h>
 #include <asm/numa.h>
 #include <asm/mpspec.h>
 #include <asm/apic.h>
 #include <asm/amd_nb.h>

 static struct bootnode __initdata nodes[8];
 static unsigned char __initdata nodeids[8];
 static nodemask_t __initdata nodes_parsed = NODE_MASK_NONE;

 static __init int find_northbridge(void)
 {
 	int num;

 	for (num = 0; num < 32; num++) {
 		u32 header;

 		header = read_pci_config(0, num, 0, 0x00);
 		if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) &&
 			header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
 			header != (PCI_VENDOR_ID_AMD | (0x1300<<16)))
 			continue;

 		header = read_pci_config(0, num, 1, 0x00);
 		if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) &&
 			header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
 			header != (PCI_VENDOR_ID_AMD | (0x1301<<16)))
 			continue;
 		return num;
 	}

 	return -1;
 }

 static __init void early_get_boot_cpu_id(void)
 {
 	/*
 	 * need to get the APIC ID of the BSP so can use that to
 	 * create apicid_to_node in amd_scan_nodes()
 	 */
 #ifdef CONFIG_X86_MPPARSE
 	/*
 	 * get boot-time SMP configuration:
 	 */
 	if (smp_found_config)
 		early_get_smp_config();
 #endif
 	early_init_lapic_mapping();
 }

 int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
 {
 	unsigned long start = PFN_PHYS(start_pfn);
 	unsigned long end = PFN_PHYS(end_pfn);
 	unsigned numnodes;
 	unsigned long prevbase;
 	int i, nb, found = 0;
 	u32 nodeid, reg;

 	if (!early_pci_allowed())
 		return -1;

 	nb = find_northbridge();
 	if (nb < 0)
 		return nb;

 	pr_info("Scanning NUMA topology in Northbridge %d\n", nb);

 	reg = read_pci_config(0, nb, 0, 0x60);
 	numnodes = ((reg >> 4) & 0xF) + 1;
 	if (numnodes <= 1)
 		return -1;

 	pr_info("Number of physical nodes %d\n", numnodes);

 	prevbase = 0;
 	for (i = 0; i < 8; i++) {
 		unsigned long base, limit;

 		base = read_pci_config(0, nb, 1, 0x40 + i*8);
 		limit = read_pci_config(0, nb, 1, 0x44 + i*8);

 		nodeids[i] = nodeid = limit & 7;
 		if ((base & 3) == 0) {
 			if (i < numnodes)
 				pr_info("Skipping disabled node %d\n", i);
 			continue;
 		}
 		if (nodeid >= numnodes) {
 			pr_info("Ignoring excess node %d (%lx:%lx)\n", nodeid,
 				base, limit);
 			continue;
 		}

 		if (!limit) {
 			pr_info("Skipping node entry %d (base %lx)\n",
 				i, base);
 			continue;
 		}
 		if ((base >> 8) & 3 || (limit >> 8) & 3) {
 			pr_err("Node %d using interleaving mode %lx/%lx\n",
 			       nodeid, (base >> 8) & 3, (limit >> 8) & 3);
 			return -1;
 		}
 		if (node_isset(nodeid, nodes_parsed)) {
 			pr_info("Node %d already present, skipping\n",
 				nodeid);
 			continue;
 		}

 		limit >>= 16;
 		limit <<= 24;
 		limit |= (1<<24)-1;
 		limit++;

 		if (limit > end)
 			limit = end;
 		if (limit <= base)
 			continue;

 		base >>= 16;
 		base <<= 24;

 		if (base < start)
 			base = start;
 		if (limit > end)
 			limit = end;
 		if (limit == base) {
 			pr_err("Empty node %d\n", nodeid);
 			continue;
 		}
 		if (limit < base) {
 			pr_err("Node %d bogus settings %lx-%lx.\n",
 			       nodeid, base, limit);
 			continue;
 		}

 		/* Could sort here, but pun for now. Should not happen anyroads. */
 		if (prevbase > base) {
 			pr_err("Node map not sorted %lx,%lx\n",
 			       prevbase, base);
 			return -1;
 		}

 		pr_info("Node %d MemBase %016lx Limit %016lx\n",
 			nodeid, base, limit);

 		found++;

 		nodes[nodeid].start = base;
 		nodes[nodeid].end = limit;

 		prevbase = base;

 		node_set(nodeid, nodes_parsed);
 	}

 	if (!found)
 		return -1;
 	return 0;
 }

 #ifdef CONFIG_NUMA_EMU
 static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
 	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
 };

 int __init amd_get_nodes(struct bootnode *physnodes)
 {
 	int i;
 	int ret = 0;

 	for_each_node_mask(i, nodes_parsed) {
 		physnodes[ret].start = nodes[i].start;
 		physnodes[ret].end = nodes[i].end;
 		ret++;
 	}
 	return ret;
 }

 static int __init find_node_by_addr(unsigned long addr)
 {
 	int ret = NUMA_NO_NODE;
 	int i;

 	for (i = 0; i < 8; i++)
 		if (addr >= nodes[i].start && addr < nodes[i].end) {
 			ret = i;
 			break;
 		}
 	return ret;
 }

 /*
  * For NUMA emulation, fake proximity domain (_PXM) to node id mappings must be
  * setup to represent the physical topology but reflect the emulated
  * environment.  For each emulated node, the real node which it appears on is
  * found and a fake pxm to nid mapping is created which mirrors the actual
  * locality.  node_distance() then represents the correct distances between
  * emulated nodes by using the fake acpi mappings to pxms.
  */
 void __init amd_fake_nodes(const struct bootnode *nodes, int nr_nodes)
 {
 	unsigned int bits;
 	unsigned int cores;
 	unsigned int apicid_base = 0;
 	int i;

 	bits = boot_cpu_data.x86_coreid_bits;
 	cores = 1 << bits;
 	early_get_boot_cpu_id();
 	if (boot_cpu_physical_apicid > 0)
 		apicid_base = boot_cpu_physical_apicid;

 	for (i = 0; i < nr_nodes; i++) {
 		int index;
 		int nid;
 		int j;

 		nid = find_node_by_addr(nodes[i].start);
 		if (nid == NUMA_NO_NODE)
 			continue;

 		index = nodeids[nid] << bits;
 		if (fake_apicid_to_node[index + apicid_base] == NUMA_NO_NODE)
 			for (j = apicid_base; j < cores + apicid_base; j++)
 				fake_apicid_to_node[index + j] = i;
 #ifdef CONFIG_ACPI_NUMA
 		__acpi_map_pxm_to_node(nid, i);
 #endif
 	}
 	memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
 }
 #endif /* CONFIG_NUMA_EMU */

 int __init amd_scan_nodes(void)
 {
 	unsigned int bits;
 	unsigned int cores;
 	unsigned int apicid_base;
 	int i;

 	BUG_ON(nodes_empty(nodes_parsed));
 	node_possible_map = nodes_parsed;
 	memnode_shift = compute_hash_shift(nodes, 8, NULL);
 	if (memnode_shift < 0) {
 		pr_err("No NUMA node hash function found. Contact maintainer\n");
 		return -1;
 	}
 	pr_info("Using node hash shift of %d\n", memnode_shift);

 	/* use the coreid bits from early_identify_cpu */
 	bits = boot_cpu_data.x86_coreid_bits;
 	cores = (1<<bits);
 	apicid_base = 0;
 	/* get the APIC ID of the BSP early for systems with apicid lifting */
 	early_get_boot_cpu_id();
 	if (boot_cpu_physical_apicid > 0) {
 		pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
 		apicid_base = boot_cpu_physical_apicid;
 	}

 	for_each_node_mask(i, node_possible_map) {
 		int j;

 		memblock_x86_register_active_regions(i,
 				nodes[i].start >> PAGE_SHIFT,
 				nodes[i].end >> PAGE_SHIFT);
 		for (j = apicid_base; j < cores + apicid_base; j++)
 			apicid_to_node[(i << bits) + j] = i;
 		setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 	}

 	numa_init_array();
 	return 0;
 }
	/*
	* AMD NUMA support.
	* Discover the memory map and associated nodes.
	*
	* This version reads it directly from the AMD northbridge.
	*
	* Copyright 2002,2003 Andi Kleen, SuSE Labs.
	*/
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/string.h>
	#include <linux/module.h>
	#include <linux/nodemask.h>
	#include <linux/memblock.h>

	#include <asm/io.h>
	#include <linux/pci_ids.h>
	#include <linux/acpi.h>
	#include <asm/types.h>
	#include <asm/mmzone.h>
	#include <asm/proto.h>
	#include <asm/e820.h>
	#include <asm/pci-direct.h>
	#include <asm/numa.h>
	#include <asm/mpspec.h>
	#include <asm/apic.h>
	#include <asm/amd_nb.h>

	static struct bootnode __initdata nodes[8];
	static unsigned char __initdata nodeids[8];
	static nodemask_t __initdata nodes_parsed = NODE_MASK_NONE;

	static __init int find_northbridge(void)
	{
	int num;

	for (num = 0; num < 32; num++) {
	u32 header;

	header = read_pci_config(0, num, 0, 0x00);
	if (header != (PCI_VENDOR_ID_AMD \| (0x1100<<16)) &&
	header != (PCI_VENDOR_ID_AMD \| (0x1200<<16)) &&
	header != (PCI_VENDOR_ID_AMD \| (0x1300<<16)))
	continue;

	header = read_pci_config(0, num, 1, 0x00);
	if (header != (PCI_VENDOR_ID_AMD \| (0x1101<<16)) &&
	header != (PCI_VENDOR_ID_AMD \| (0x1201<<16)) &&
	header != (PCI_VENDOR_ID_AMD \| (0x1301<<16)))
	continue;
	return num;
	}

	return -1;
	}

	static __init void early_get_boot_cpu_id(void)
	{
	/*
	* need to get the APIC ID of the BSP so can use that to
	* create apicid_to_node in amd_scan_nodes()
	*/
	#ifdef CONFIG_X86_MPPARSE
	/*
	* get boot-time SMP configuration:
	*/
	if (smp_found_config)
	early_get_smp_config();
	#endif
	early_init_lapic_mapping();
	}

	int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
	{
	unsigned long start = PFN_PHYS(start_pfn);
	unsigned long end = PFN_PHYS(end_pfn);
	unsigned numnodes;
	unsigned long prevbase;
	int i, nb, found = 0;
	u32 nodeid, reg;

	if (!early_pci_allowed())
	return -1;

	nb = find_northbridge();
	if (nb < 0)
	return nb;

	pr_info("Scanning NUMA topology in Northbridge %d\n", nb);

	reg = read_pci_config(0, nb, 0, 0x60);
	numnodes = ((reg >> 4) & 0xF) + 1;
	if (numnodes <= 1)
	return -1;

	pr_info("Number of physical nodes %d\n", numnodes);

	prevbase = 0;
	for (i = 0; i < 8; i++) {
	unsigned long base, limit;

	base = read_pci_config(0, nb, 1, 0x40 + i*8);
	limit = read_pci_config(0, nb, 1, 0x44 + i*8);

	nodeids[i] = nodeid = limit & 7;
	if ((base & 3) == 0) {
	if (i < numnodes)
	pr_info("Skipping disabled node %d\n", i);
	continue;
	}
	if (nodeid >= numnodes) {
	pr_info("Ignoring excess node %d (%lx:%lx)\n", nodeid,
	base, limit);
	continue;
	}

	if (!limit) {
	pr_info("Skipping node entry %d (base %lx)\n",
	i, base);
	continue;
	}
	if ((base >> 8) & 3 \|\| (limit >> 8) & 3) {
	pr_err("Node %d using interleaving mode %lx/%lx\n",
	nodeid, (base >> 8) & 3, (limit >> 8) & 3);
	return -1;
	}
	if (node_isset(nodeid, nodes_parsed)) {
	pr_info("Node %d already present, skipping\n",
	nodeid);
	continue;
	}

	limit >>= 16;
	limit <<= 24;
	limit \|= (1<<24)-1;
	limit++;

	if (limit > end)
	limit = end;
	if (limit <= base)
	continue;

	base >>= 16;
	base <<= 24;

	if (base < start)
	base = start;
	if (limit > end)
	limit = end;
	if (limit == base) {
	pr_err("Empty node %d\n", nodeid);
	continue;
	}
	if (limit < base) {
	pr_err("Node %d bogus settings %lx-%lx.\n",
	nodeid, base, limit);
	continue;
	}

	/* Could sort here, but pun for now. Should not happen anyroads. */
	if (prevbase > base) {
	pr_err("Node map not sorted %lx,%lx\n",
	prevbase, base);
	return -1;
	}

	pr_info("Node %d MemBase %016lx Limit %016lx\n",
	nodeid, base, limit);

	found++;

	nodes[nodeid].start = base;
	nodes[nodeid].end = limit;

	prevbase = base;

	node_set(nodeid, nodes_parsed);
	}

	if (!found)
	return -1;
	return 0;
	}

	#ifdef CONFIG_NUMA_EMU
	static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
	};

	int __init amd_get_nodes(struct bootnode *physnodes)
	{
	int i;
	int ret = 0;

	for_each_node_mask(i, nodes_parsed) {
	physnodes[ret].start = nodes[i].start;
	physnodes[ret].end = nodes[i].end;
	ret++;
	}
	return ret;
	}

	static int __init find_node_by_addr(unsigned long addr)
	{
	int ret = NUMA_NO_NODE;
	int i;

	for (i = 0; i < 8; i++)
	if (addr >= nodes[i].start && addr < nodes[i].end) {
	ret = i;
	break;
	}
	return ret;
	}

	/*
	* For NUMA emulation, fake proximity domain (_PXM) to node id mappings must be
	* setup to represent the physical topology but reflect the emulated
	* environment. For each emulated node, the real node which it appears on is
	* found and a fake pxm to nid mapping is created which mirrors the actual
	* locality. node_distance() then represents the correct distances between
	* emulated nodes by using the fake acpi mappings to pxms.
	*/
	void __init amd_fake_nodes(const struct bootnode *nodes, int nr_nodes)
	{
	unsigned int bits;
	unsigned int cores;
	unsigned int apicid_base = 0;
	int i;

	bits = boot_cpu_data.x86_coreid_bits;
	cores = 1 << bits;
	early_get_boot_cpu_id();
	if (boot_cpu_physical_apicid > 0)
	apicid_base = boot_cpu_physical_apicid;

	for (i = 0; i < nr_nodes; i++) {
	int index;
	int nid;
	int j;

	nid = find_node_by_addr(nodes[i].start);
	if (nid == NUMA_NO_NODE)
	continue;

	index = nodeids[nid] << bits;
	if (fake_apicid_to_node[index + apicid_base] == NUMA_NO_NODE)
	for (j = apicid_base; j < cores + apicid_base; j++)
	fake_apicid_to_node[index + j] = i;
	#ifdef CONFIG_ACPI_NUMA
	__acpi_map_pxm_to_node(nid, i);
	#endif
	}
	memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
	}
	#endif /* CONFIG_NUMA_EMU */

	int __init amd_scan_nodes(void)
	{
	unsigned int bits;
	unsigned int cores;
	unsigned int apicid_base;
	int i;

	BUG_ON(nodes_empty(nodes_parsed));
	node_possible_map = nodes_parsed;
	memnode_shift = compute_hash_shift(nodes, 8, NULL);
	if (memnode_shift < 0) {
	pr_err("No NUMA node hash function found. Contact maintainer\n");
	return -1;
	}
	pr_info("Using node hash shift of %d\n", memnode_shift);

	/* use the coreid bits from early_identify_cpu */
	bits = boot_cpu_data.x86_coreid_bits;
	cores = (1<<bits);
	apicid_base = 0;
	/* get the APIC ID of the BSP early for systems with apicid lifting */
	early_get_boot_cpu_id();
	if (boot_cpu_physical_apicid > 0) {
	pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
	apicid_base = boot_cpu_physical_apicid;
	}

	for_each_node_mask(i, node_possible_map) {
	int j;

	memblock_x86_register_active_regions(i,
	nodes[i].start >> PAGE_SHIFT,
	nodes[i].end >> PAGE_SHIFT);
	for (j = apicid_base; j < cores + apicid_base; j++)
	apicid_to_node[(i << bits) + j] = i;
	setup_node_bootmem(i, nodes[i].start, nodes[i].end);
	}

	numa_init_array();
	return 0;
	}