x86_64: prepare shared mm/srat.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 566 deletions

diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
deleted file mode 100644
index acdf03e19146..000000000000
--- a/arch/x86_64/mm/srat.c
+++ /dev/null
@@ -1,566 +0,0 @@
-/*
- * ACPI 3.0 based NUMA setup
- * Copyright 2004 Andi Kleen, SuSE Labs.
- *
- * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
- *
- * Called from acpi_numa_init while reading the SRAT and SLIT tables.
- * Assumes all memory regions belonging to a single proximity domain
- * are in one chunk. Holes between them will be included in the node.
- */
-
-#include <linux/kernel.h>
-#include <linux/acpi.h>
-#include <linux/mmzone.h>
-#include <linux/bitmap.h>
-#include <linux/module.h>
-#include <linux/topology.h>
-#include <linux/bootmem.h>
-#include <linux/mm.h>
-#include <asm/proto.h>
-#include <asm/numa.h>
-#include <asm/e820.h>
-
-int acpi_numa __initdata;
-
-static struct acpi_table_slit *acpi_slit;
-
-static nodemask_t nodes_parsed __initdata;
-static struct bootnode nodes[MAX_NUMNODES] __initdata;
-static struct bootnode nodes_add[MAX_NUMNODES];
-static int found_add_area __initdata;
-int hotadd_percent __initdata = 0;
-
-/* Too small nodes confuse the VM badly. Usually they result
-   from BIOS bugs. */
-#define NODE_MIN_SIZE (4*1024*1024)
-
-static __init int setup_node(int pxm)
-{
-	return acpi_map_pxm_to_node(pxm);
-}
-
-static __init int conflicting_nodes(unsigned long start, unsigned long end)
-{
-	int i;
-	for_each_node_mask(i, nodes_parsed) {
-		struct bootnode *nd = &nodes[i];
-		if (nd->start == nd->end)
-			continue;
-		if (nd->end > start && nd->start < end)
-			return i;
-		if (nd->end == end && nd->start == start)
-			return i;
-	}
-	return -1;
-}
-
-static __init void cutoff_node(int i, unsigned long start, unsigned long end)
-{
-	struct bootnode *nd = &nodes[i];
-
-	if (found_add_area)
-		return;
-
-	if (nd->start < start) {
-		nd->start = start;
-		if (nd->end < nd->start)
-			nd->start = nd->end;
-	}
-	if (nd->end > end) {
-		nd->end = end;
-		if (nd->start > nd->end)
-			nd->start = nd->end;
-	}
-}
-
-static __init void bad_srat(void)
-{
-	int i;
-	printk(KERN_ERR "SRAT: SRAT not used.\n");
-	acpi_numa = -1;
-	found_add_area = 0;
-	for (i = 0; i < MAX_LOCAL_APIC; i++)
-		apicid_to_node[i] = NUMA_NO_NODE;
-	for (i = 0; i < MAX_NUMNODES; i++)
-		nodes_add[i].start = nodes[i].end = 0;
-	remove_all_active_ranges();
-}
-
-static __init inline int srat_disabled(void)
-{
-	return numa_off || acpi_numa < 0;
-}
-
-/*
- * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
- * up the NUMA heuristics which wants the local node to have a smaller
- * distance than the others.
- * Do some quick checks here and only use the SLIT if it passes.
- */
-static __init int slit_valid(struct acpi_table_slit *slit)
-{
-	int i, j;
-	int d = slit->locality_count;
-	for (i = 0; i < d; i++) {
-		for (j = 0; j < d; j++)  {
-			u8 val = slit->entry[d*i + j];
-			if (i == j) {
-				if (val != LOCAL_DISTANCE)
-					return 0;
-			} else if (val <= LOCAL_DISTANCE)
-				return 0;
-		}
-	}
-	return 1;
-}
-
-/* Callback for SLIT parsing */
-void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
-{
-	if (!slit_valid(slit)) {
-		printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
-		return;
-	}
-	acpi_slit = slit;
-}
-
-/* Callback for Proximity Domain -> LAPIC mapping */
-void __init
-acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
-{
-	int pxm, node;
-	if (srat_disabled())
-		return;
-	if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
-		bad_srat();
-		return;
-	}
-	if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
-		return;
-	pxm = pa->proximity_domain_lo;
-	node = setup_node(pxm);
-	if (node < 0) {
-		printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
-		bad_srat();
-		return;
-	}
-	apicid_to_node[pa->apic_id] = node;
-	acpi_numa = 1;
-	printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> Node %u\n",
-	       pxm, pa->apic_id, node);
-}
-
-#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
-/*
- * Protect against too large hotadd areas that would fill up memory.
- */
-static int hotadd_enough_memory(struct bootnode *nd)
-{
-	static unsigned long allocated;
-	static unsigned long last_area_end;
-	unsigned long pages = (nd->end - nd->start) >> PAGE_SHIFT;
-	long mem = pages * sizeof(struct page);
-	unsigned long addr;
-	unsigned long allowed;
-	unsigned long oldpages = pages;
-
-	if (mem < 0)
-		return 0;
-	allowed = (end_pfn - absent_pages_in_range(0, end_pfn)) * PAGE_SIZE;
-	allowed = (allowed / 100) * hotadd_percent;
-	if (allocated + mem > allowed) {
-		unsigned long range;
-		/* Give them at least part of their hotadd memory upto hotadd_percent
-		   It would be better to spread the limit out
-		   over multiple hotplug areas, but that is too complicated
-		   right now */
-		if (allocated >= allowed)
-			return 0;
-		range = allowed - allocated;
-		pages = (range / PAGE_SIZE);
-		mem = pages * sizeof(struct page);
-		nd->end = nd->start + range;
-	}
-	/* Not completely fool proof, but a good sanity check */
-	addr = find_e820_area(last_area_end, end_pfn<<PAGE_SHIFT, mem);
-	if (addr == -1UL)
-		return 0;
-	if (pages != oldpages)
-		printk(KERN_NOTICE "SRAT: Hotadd area limited to %lu bytes\n",
-			pages << PAGE_SHIFT);
-	last_area_end = addr + mem;
-	allocated += mem;
-	return 1;
-}
-
-static int update_end_of_memory(unsigned long end)
-{
-	found_add_area = 1;
-	if ((end >> PAGE_SHIFT) > end_pfn)
-		end_pfn = end >> PAGE_SHIFT;
-	return 1;
-}
-
-static inline int save_add_info(void)
-{
-	return hotadd_percent > 0;
-}
-#else
-int update_end_of_memory(unsigned long end) {return -1;}
-static int hotadd_enough_memory(struct bootnode *nd) {return 1;}
-#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
-static inline int save_add_info(void) {return 1;}
-#else
-static inline int save_add_info(void) {return 0;}
-#endif
-#endif
-/*
- * Update nodes_add and decide if to include add are in the zone.
- * Both SPARSE and RESERVE need nodes_add infomation.
- * This code supports one contigious hot add area per node.
- */
-static int reserve_hotadd(int node, unsigned long start, unsigned long end)
-{
-	unsigned long s_pfn = start >> PAGE_SHIFT;
-	unsigned long e_pfn = end >> PAGE_SHIFT;
-	int ret = 0, changed = 0;
-	struct bootnode *nd = &nodes_add[node];
-
-	/* I had some trouble with strange memory hotadd regions breaking
-	   the boot. Be very strict here and reject anything unexpected.
-	   If you want working memory hotadd write correct SRATs.
-
-	   The node size check is a basic sanity check to guard against
-	   mistakes */
-	if ((signed long)(end - start) < NODE_MIN_SIZE) {
-		printk(KERN_ERR "SRAT: Hotplug area too small\n");
-		return -1;
-	}
-
-	/* This check might be a bit too strict, but I'm keeping it for now. */
-	if (absent_pages_in_range(s_pfn, e_pfn) != e_pfn - s_pfn) {
-		printk(KERN_ERR
-			"SRAT: Hotplug area %lu -> %lu has existing memory\n",
-			s_pfn, e_pfn);
-		return -1;
-	}
-
-	if (!hotadd_enough_memory(&nodes_add[node]))  {
-		printk(KERN_ERR "SRAT: Hotplug area too large\n");
-		return -1;
-	}
-
-	/* Looks good */
-
-	if (nd->start == nd->end) {
-		nd->start = start;
-		nd->end = end;
-		changed = 1;
-	} else {
-		if (nd->start == end) {
-			nd->start = start;
-			changed = 1;
-		}
-		if (nd->end == start) {
-			nd->end = end;
-			changed = 1;
-		}
-		if (!changed)
-			printk(KERN_ERR "SRAT: Hotplug zone not continuous. Partly ignored\n");
-	}
-
-	ret = update_end_of_memory(nd->end);
-
-	if (changed)
-	 	printk(KERN_INFO "SRAT: hot plug zone found %Lx - %Lx\n", nd->start, nd->end);
-	return ret;
-}
-
-/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
-void __init
-acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
-{
-	struct bootnode *nd, oldnode;
-	unsigned long start, end;
-	int node, pxm;
-	int i;
-
-	if (srat_disabled())
-		return;
-	if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
-		bad_srat();
-		return;
-	}
-	if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
-		return;
-
-	if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
-		return;
-	start = ma->base_address;
-	end = start + ma->length;
-	pxm = ma->proximity_domain;
-	node = setup_node(pxm);
-	if (node < 0) {
-		printk(KERN_ERR "SRAT: Too many proximity domains.\n");
-		bad_srat();
-		return;
-	}
-	i = conflicting_nodes(start, end);
-	if (i == node) {
-		printk(KERN_WARNING
-		"SRAT: Warning: PXM %d (%lx-%lx) overlaps with itself (%Lx-%Lx)\n",
-			pxm, start, end, nodes[i].start, nodes[i].end);
-	} else if (i >= 0) {
-		printk(KERN_ERR
-		       "SRAT: PXM %d (%lx-%lx) overlaps with PXM %d (%Lx-%Lx)\n",
-		       pxm, start, end, node_to_pxm(i),
-			nodes[i].start, nodes[i].end);
-		bad_srat();
-		return;
-	}
-	nd = &nodes[node];
-	oldnode = *nd;
-	if (!node_test_and_set(node, nodes_parsed)) {
-		nd->start = start;
-		nd->end = end;
-	} else {
-		if (start < nd->start)
-			nd->start = start;
-		if (nd->end < end)
-			nd->end = end;
-	}
-
-	printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm,
-	       nd->start, nd->end);
-	e820_register_active_regions(node, nd->start >> PAGE_SHIFT,
-						nd->end >> PAGE_SHIFT);
-	push_node_boundaries(node, nd->start >> PAGE_SHIFT,
-						nd->end >> PAGE_SHIFT);
-
-	if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) &&
-	    (reserve_hotadd(node, start, end) < 0)) {
-		/* Ignore hotadd region. Undo damage */
-		printk(KERN_NOTICE "SRAT: Hotplug region ignored\n");
-		*nd = oldnode;
-		if ((nd->start | nd->end) == 0)
-			node_clear(node, nodes_parsed);
-	}
-}
-
-/* Sanity check to catch more bad SRATs (they are amazingly common).
-   Make sure the PXMs cover all memory. */
-static int __init nodes_cover_memory(const struct bootnode *nodes)
-{
-	int i;
-	unsigned long pxmram, e820ram;
-
-	pxmram = 0;
-	for_each_node_mask(i, nodes_parsed) {
-		unsigned long s = nodes[i].start >> PAGE_SHIFT;
-		unsigned long e = nodes[i].end >> PAGE_SHIFT;
-		pxmram += e - s;
-		pxmram -= absent_pages_in_range(s, e);
-		if ((long)pxmram < 0)
-			pxmram = 0;
-	}
-
-	e820ram = end_pfn - absent_pages_in_range(0, end_pfn);
-	/* We seem to lose 3 pages somewhere. Allow a bit of slack. */
-	if ((long)(e820ram - pxmram) >= 1*1024*1024) {
-		printk(KERN_ERR
-	"SRAT: PXMs only cover %luMB of your %luMB e820 RAM. Not used.\n",
-			(pxmram << PAGE_SHIFT) >> 20,
-			(e820ram << PAGE_SHIFT) >> 20);
-		return 0;
-	}
-	return 1;
-}
-
-static void unparse_node(int node)
-{
-	int i;
-	node_clear(node, nodes_parsed);
-	for (i = 0; i < MAX_LOCAL_APIC; i++) {
-		if (apicid_to_node[i] == node)
-			apicid_to_node[i] = NUMA_NO_NODE;
-	}
-}
-
-void __init acpi_numa_arch_fixup(void) {}
-
-/* Use the information discovered above to actually set up the nodes. */
-int __init acpi_scan_nodes(unsigned long start, unsigned long end)
-{
-	int i;
-
-	if (acpi_numa <= 0)
-		return -1;
-
-	/* First clean up the node list */
-	for (i = 0; i < MAX_NUMNODES; i++) {
-		cutoff_node(i, start, end);
-		if ((nodes[i].end - nodes[i].start) < NODE_MIN_SIZE) {
-			unparse_node(i);
-			node_set_offline(i);
-		}
-	}
-
-	if (!nodes_cover_memory(nodes)) {
-		bad_srat();
-		return -1;
-	}
-
-	memnode_shift = compute_hash_shift(nodes, MAX_NUMNODES);
-	if (memnode_shift < 0) {
-		printk(KERN_ERR
-		     "SRAT: No NUMA node hash function found. Contact maintainer\n");
-		bad_srat();
-		return -1;
-	}
-
-	node_possible_map = nodes_parsed;
-
-	/* Finally register nodes */
-	for_each_node_mask(i, node_possible_map)
-		setup_node_bootmem(i, nodes[i].start, nodes[i].end);
-	/* Try again in case setup_node_bootmem missed one due
-	   to missing bootmem */
-	for_each_node_mask(i, node_possible_map)
-		if (!node_online(i))
-			setup_node_bootmem(i, nodes[i].start, nodes[i].end);
-
-	for (i = 0; i < NR_CPUS; i++) {
-		if (cpu_to_node[i] == NUMA_NO_NODE)
-			continue;
-		if (!node_isset(cpu_to_node[i], node_possible_map))
-			numa_set_node(i, NUMA_NO_NODE);
-	}
-	numa_init_array();
-	return 0;
-}
-
-#ifdef CONFIG_NUMA_EMU
-static int __init find_node_by_addr(unsigned long addr)
-{
-	int ret = NUMA_NO_NODE;
-	int i;
-
-	for_each_node_mask(i, nodes_parsed) {
-		/*
-		 * Find the real node that this emulated node appears on.  For
-		 * the sake of simplicity, we only use a real node's starting
-		 * address to determine which emulated node it appears on.
-		 */
-		if (addr >= nodes[i].start && addr < nodes[i].end) {
-			ret = i;
-			break;
-		}
-	}
-	return i;
-}
-
-/*
- * In NUMA emulation, we need to setup proximity domain (_PXM) to node ID
- * mappings that respect the real ACPI topology but reflect our emulated
- * environment.  For each emulated node, we find which real node it appears on
- * and create PXM to NID mappings for those fake nodes which mirror that
- * locality.  SLIT will now represent the correct distances between emulated
- * nodes as a result of the real topology.
- */
-void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
-{
-	int i, j;
-	int fake_node_to_pxm_map[MAX_NUMNODES] = {
-		[0 ... MAX_NUMNODES-1] = PXM_INVAL
-	};
-	unsigned char fake_apicid_to_node[MAX_LOCAL_APIC] = {
-		[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
-	};
-
-	printk(KERN_INFO "Faking PXM affinity for fake nodes on real "
-			 "topology.\n");
-	for (i = 0; i < num_nodes; i++) {
-		int nid, pxm;
-
-		nid = find_node_by_addr(fake_nodes[i].start);
-		if (nid == NUMA_NO_NODE)
-			continue;
-		pxm = node_to_pxm(nid);
-		if (pxm == PXM_INVAL)
-			continue;
-		fake_node_to_pxm_map[i] = pxm;
-		/*
-		 * For each apicid_to_node mapping that exists for this real
-		 * node, it must now point to the fake node ID.
-		 */
-		for (j = 0; j < MAX_LOCAL_APIC; j++)
-			if (apicid_to_node[j] == nid)
-				fake_apicid_to_node[j] = i;
-	}
-	for (i = 0; i < num_nodes; i++)
-		__acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
-	memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
-
-	nodes_clear(nodes_parsed);
-	for (i = 0; i < num_nodes; i++)
-		if (fake_nodes[i].start != fake_nodes[i].end)
-			node_set(i, nodes_parsed);
-	WARN_ON(!nodes_cover_memory(fake_nodes));
-}
-
-static int null_slit_node_compare(int a, int b)
-{
-	return node_to_pxm(a) == node_to_pxm(b);
-}
-#else
-static int null_slit_node_compare(int a, int b)
-{
-	return a == b;
-}
-#endif /* CONFIG_NUMA_EMU */
-
-void __init srat_reserve_add_area(int nodeid)
-{
-	if (found_add_area && nodes_add[nodeid].end) {
-		u64 total_mb;
-
-		printk(KERN_INFO "SRAT: Reserving hot-add memory space "
-				"for node %d at %Lx-%Lx\n",
-			nodeid, nodes_add[nodeid].start, nodes_add[nodeid].end);
-		total_mb = (nodes_add[nodeid].end - nodes_add[nodeid].start)
-					>> PAGE_SHIFT;
-		total_mb *= sizeof(struct page);
-		total_mb >>= 20;
-		printk(KERN_INFO "SRAT: This will cost you %Lu MB of "
-				"pre-allocated memory.\n", (unsigned long long)total_mb);
-		reserve_bootmem_node(NODE_DATA(nodeid), nodes_add[nodeid].start,
-			       nodes_add[nodeid].end - nodes_add[nodeid].start);
-	}
-}
-
-int __node_distance(int a, int b)
-{
-	int index;
-
-	if (!acpi_slit)
-		return null_slit_node_compare(a, b) ? LOCAL_DISTANCE :
-						      REMOTE_DISTANCE;
-	index = acpi_slit->locality_count * node_to_pxm(a);
-	return acpi_slit->entry[index + node_to_pxm(b)];
-}
-
-EXPORT_SYMBOL(__node_distance);
-
-int memory_add_physaddr_to_nid(u64 start)
-{
-	int i, ret = 0;
-
-	for_each_node(i)
-		if (nodes_add[i].start <= start && nodes_add[i].end > start)
-			ret = i;
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
-