x86_64: prepare shared mm/numa.c

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

1 files changed, 0 insertions, 648 deletions

diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
deleted file mode 100644
index 6da235522269e8..00000000000000
--- a/arch/x86_64/mm/numa.c
+++ /dev/null
@@ -1,648 +0,0 @@
-/* 
- * Generic VM initialization for x86-64 NUMA setups.
- * Copyright 2002,2003 Andi Kleen, SuSE Labs.
- */ 
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/init.h>
-#include <linux/bootmem.h>
-#include <linux/mmzone.h>
-#include <linux/ctype.h>
-#include <linux/module.h>
-#include <linux/nodemask.h>
-
-#include <asm/e820.h>
-#include <asm/proto.h>
-#include <asm/dma.h>
-#include <asm/numa.h>
-#include <asm/acpi.h>
-
-#ifndef Dprintk
-#define Dprintk(x...)
-#endif
-
-struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
-bootmem_data_t plat_node_bdata[MAX_NUMNODES];
-
-struct memnode memnode;
-
-unsigned char cpu_to_node[NR_CPUS] __read_mostly = {
-	[0 ... NR_CPUS-1] = NUMA_NO_NODE
-};
-unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
- 	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
-};
-cpumask_t node_to_cpumask[MAX_NUMNODES] __read_mostly;
-
-int numa_off __initdata;
-unsigned long __initdata nodemap_addr;
-unsigned long __initdata nodemap_size;
-
-
-/*
- * Given a shift value, try to populate memnodemap[]
- * Returns :
- * 1 if OK
- * 0 if memnodmap[] too small (of shift too small)
- * -1 if node overlap or lost ram (shift too big)
- */
-static int __init
-populate_memnodemap(const struct bootnode *nodes, int numnodes, int shift)
-{
-	int i; 
-	int res = -1;
-	unsigned long addr, end;
-
-	memset(memnodemap, 0xff, memnodemapsize);
-	for (i = 0; i < numnodes; i++) {
-		addr = nodes[i].start;
-		end = nodes[i].end;
-		if (addr >= end)
-			continue;
-		if ((end >> shift) >= memnodemapsize)
-			return 0;
-		do {
-			if (memnodemap[addr >> shift] != 0xff)
-				return -1;
-			memnodemap[addr >> shift] = i;
-			addr += (1UL << shift);
-		} while (addr < end);
-		res = 1;
-	} 
-	return res;
-}
-
-static int __init allocate_cachealigned_memnodemap(void)
-{
-	unsigned long pad, pad_addr;
-
-	memnodemap = memnode.embedded_map;
-	if (memnodemapsize <= 48)
-		return 0;
-
-	pad = L1_CACHE_BYTES - 1;
-	pad_addr = 0x8000;
-	nodemap_size = pad + memnodemapsize;
-	nodemap_addr = find_e820_area(pad_addr, end_pfn<<PAGE_SHIFT,
-				      nodemap_size);
-	if (nodemap_addr == -1UL) {
-		printk(KERN_ERR
-		       "NUMA: Unable to allocate Memory to Node hash map\n");
-		nodemap_addr = nodemap_size = 0;
-		return -1;
-	}
-	pad_addr = (nodemap_addr + pad) & ~pad;
-	memnodemap = phys_to_virt(pad_addr);
-
-	printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",
-	       nodemap_addr, nodemap_addr + nodemap_size);
-	return 0;
-}
-
-/*
- * The LSB of all start and end addresses in the node map is the value of the
- * maximum possible shift.
- */
-static int __init
-extract_lsb_from_nodes (const struct bootnode *nodes, int numnodes)
-{
-	int i, nodes_used = 0;
-	unsigned long start, end;
-	unsigned long bitfield = 0, memtop = 0;
-
-	for (i = 0; i < numnodes; i++) {
-		start = nodes[i].start;
-		end = nodes[i].end;
-		if (start >= end)
-			continue;
-		bitfield |= start;
-		nodes_used++;
-		if (end > memtop)
-			memtop = end;
-	}
-	if (nodes_used <= 1)
-		i = 63;
-	else
-		i = find_first_bit(&bitfield, sizeof(unsigned long)*8);
-	memnodemapsize = (memtop >> i)+1;
-	return i;
-}
-
-int __init compute_hash_shift(struct bootnode *nodes, int numnodes)
-{
-	int shift;
-
-	shift = extract_lsb_from_nodes(nodes, numnodes);
-	if (allocate_cachealigned_memnodemap())
-		return -1;
-	printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",
-		shift);
-
-	if (populate_memnodemap(nodes, numnodes, shift) != 1) {
-		printk(KERN_INFO
-	"Your memory is not aligned you need to rebuild your kernel "
-	"with a bigger NODEMAPSIZE shift=%d\n",
-			shift);
-		return -1;
-	}
-	return shift;
-}
-
-#ifdef CONFIG_SPARSEMEM
-int early_pfn_to_nid(unsigned long pfn)
-{
-	return phys_to_nid(pfn << PAGE_SHIFT);
-}
-#endif
-
-static void * __init
-early_node_mem(int nodeid, unsigned long start, unsigned long end,
-	      unsigned long size)
-{
-	unsigned long mem = find_e820_area(start, end, size);
-	void *ptr;
-	if (mem != -1L)
-		return __va(mem);
-	ptr = __alloc_bootmem_nopanic(size,
-				SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS));
-	if (ptr == 0) {
-		printk(KERN_ERR "Cannot find %lu bytes in node %d\n",
-			size, nodeid);
-		return NULL;
-	}
-	return ptr;
-}
-
-/* Initialize bootmem allocator for a node */
-void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
-{ 
-	unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start; 
-	unsigned long nodedata_phys;
-	void *bootmap;
-	const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE);
-
-	start = round_up(start, ZONE_ALIGN); 
-
-	printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end);
-
-	start_pfn = start >> PAGE_SHIFT;
-	end_pfn = end >> PAGE_SHIFT;
-
-	node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size);
-	if (node_data[nodeid] == NULL)
-		return;
-	nodedata_phys = __pa(node_data[nodeid]);
-
-	memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
-	NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid];
-	NODE_DATA(nodeid)->node_start_pfn = start_pfn;
-	NODE_DATA(nodeid)->node_spanned_pages = end_pfn - start_pfn;
-
-	/* Find a place for the bootmem map */
-	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 
-	bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
-	bootmap = early_node_mem(nodeid, bootmap_start, end,
-					bootmap_pages<<PAGE_SHIFT);
-	if (bootmap == NULL)  {
-		if (nodedata_phys < start || nodedata_phys >= end)
-			free_bootmem((unsigned long)node_data[nodeid],pgdat_size);
-		node_data[nodeid] = NULL;
-		return;
-	}
-	bootmap_start = __pa(bootmap);
-	Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages); 
-	
-	bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
-					 bootmap_start >> PAGE_SHIFT, 
-					 start_pfn, end_pfn); 
-
-	free_bootmem_with_active_regions(nodeid, end);
-
-	reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size); 
-	reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT);
-#ifdef CONFIG_ACPI_NUMA
-	srat_reserve_add_area(nodeid);
-#endif
-	node_set_online(nodeid);
-} 
-
-/* Initialize final allocator for a zone */
-void __init setup_node_zones(int nodeid)
-{ 
-	unsigned long start_pfn, end_pfn, memmapsize, limit;
-
- 	start_pfn = node_start_pfn(nodeid);
- 	end_pfn = node_end_pfn(nodeid);
-
-	Dprintk(KERN_INFO "Setting up memmap for node %d %lx-%lx\n",
-		nodeid, start_pfn, end_pfn);
-
-	/* Try to allocate mem_map at end to not fill up precious <4GB
-	   memory. */
-	memmapsize = sizeof(struct page) * (end_pfn-start_pfn);
-	limit = end_pfn << PAGE_SHIFT;
-#ifdef CONFIG_FLAT_NODE_MEM_MAP
-	NODE_DATA(nodeid)->node_mem_map = 
-		__alloc_bootmem_core(NODE_DATA(nodeid)->bdata, 
-				memmapsize, SMP_CACHE_BYTES, 
-				round_down(limit - memmapsize, PAGE_SIZE), 
-				limit);
-#endif
-} 
-
-void __init numa_init_array(void)
-{
-	int rr, i;
-	/* There are unfortunately some poorly designed mainboards around
-	   that only connect memory to a single CPU. This breaks the 1:1 cpu->node
-	   mapping. To avoid this fill in the mapping for all possible
-	   CPUs, as the number of CPUs is not known yet. 
-	   We round robin the existing nodes. */
-	rr = first_node(node_online_map);
-	for (i = 0; i < NR_CPUS; i++) {
-		if (cpu_to_node[i] != NUMA_NO_NODE)
-			continue;
- 		numa_set_node(i, rr);
-		rr = next_node(rr, node_online_map);
-		if (rr == MAX_NUMNODES)
-			rr = first_node(node_online_map);
-	}
-
-}
-
-#ifdef CONFIG_NUMA_EMU
-/* Numa emulation */
-char *cmdline __initdata;
-
-/*
- * Setups up nid to range from addr to addr + size.  If the end boundary is
- * greater than max_addr, then max_addr is used instead.  The return value is 0
- * if there is additional memory left for allocation past addr and -1 otherwise.
- * addr is adjusted to be at the end of the node.
- */
-static int __init setup_node_range(int nid, struct bootnode *nodes, u64 *addr,
-				   u64 size, u64 max_addr)
-{
-	int ret = 0;
-	nodes[nid].start = *addr;
-	*addr += size;
-	if (*addr >= max_addr) {
-		*addr = max_addr;
-		ret = -1;
-	}
-	nodes[nid].end = *addr;
-	node_set(nid, node_possible_map);
-	printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", nid,
-	       nodes[nid].start, nodes[nid].end,
-	       (nodes[nid].end - nodes[nid].start) >> 20);
-	return ret;
-}
-
-/*
- * Splits num_nodes nodes up equally starting at node_start.  The return value
- * is the number of nodes split up and addr is adjusted to be at the end of the
- * last node allocated.
- */
-static int __init split_nodes_equally(struct bootnode *nodes, u64 *addr,
-				      u64 max_addr, int node_start,
-				      int num_nodes)
-{
-	unsigned int big;
-	u64 size;
-	int i;
-
-	if (num_nodes <= 0)
-		return -1;
-	if (num_nodes > MAX_NUMNODES)
-		num_nodes = MAX_NUMNODES;
-	size = (max_addr - *addr - e820_hole_size(*addr, max_addr)) /
-	       num_nodes;
-	/*
-	 * Calculate the number of big nodes that can be allocated as a result
-	 * of consolidating the leftovers.
-	 */
-	big = ((size & ~FAKE_NODE_MIN_HASH_MASK) * num_nodes) /
-	      FAKE_NODE_MIN_SIZE;
-
-	/* Round down to nearest FAKE_NODE_MIN_SIZE. */
-	size &= FAKE_NODE_MIN_HASH_MASK;
-	if (!size) {
-		printk(KERN_ERR "Not enough memory for each node.  "
-		       "NUMA emulation disabled.\n");
-		return -1;
-	}
-
-	for (i = node_start; i < num_nodes + node_start; i++) {
-		u64 end = *addr + size;
-		if (i < big)
-			end += FAKE_NODE_MIN_SIZE;
-		/*
-		 * The final node can have the remaining system RAM.  Other
-		 * nodes receive roughly the same amount of available pages.
-		 */
-		if (i == num_nodes + node_start - 1)
-			end = max_addr;
-		else
-			while (end - *addr - e820_hole_size(*addr, end) <
-			       size) {
-				end += FAKE_NODE_MIN_SIZE;
-				if (end > max_addr) {
-					end = max_addr;
-					break;
-				}
-			}
-		if (setup_node_range(i, nodes, addr, end - *addr, max_addr) < 0)
-			break;
-	}
-	return i - node_start + 1;
-}
-
-/*
- * Splits the remaining system RAM into chunks of size.  The remaining memory is
- * always assigned to a final node and can be asymmetric.  Returns the number of
- * nodes split.
- */
-static int __init split_nodes_by_size(struct bootnode *nodes, u64 *addr,
-				      u64 max_addr, int node_start, u64 size)
-{
-	int i = node_start;
-	size = (size << 20) & FAKE_NODE_MIN_HASH_MASK;
-	while (!setup_node_range(i++, nodes, addr, size, max_addr))
-		;
-	return i - node_start;
-}
-
-/*
- * Sets up the system RAM area from start_pfn to end_pfn according to the
- * numa=fake command-line option.
- */
-static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
-{
-	struct bootnode nodes[MAX_NUMNODES];
-	u64 addr = start_pfn << PAGE_SHIFT;
-	u64 max_addr = end_pfn << PAGE_SHIFT;
-	int num_nodes = 0;
-	int coeff_flag;
-	int coeff = -1;
-	int num = 0;
-	u64 size;
-	int i;
-
-	memset(&nodes, 0, sizeof(nodes));
-	/*
-	 * If the numa=fake command-line is just a single number N, split the
-	 * system RAM into N fake nodes.
-	 */
-	if (!strchr(cmdline, '*') && !strchr(cmdline, ',')) {
-		num_nodes = split_nodes_equally(nodes, &addr, max_addr, 0,
-						simple_strtol(cmdline, NULL, 0));
-		if (num_nodes < 0)
-			return num_nodes;
-		goto out;
-	}
-
-	/* Parse the command line. */
-	for (coeff_flag = 0; ; cmdline++) {
-		if (*cmdline && isdigit(*cmdline)) {
-			num = num * 10 + *cmdline - '0';
-			continue;
-		}
-		if (*cmdline == '*') {
-			if (num > 0)
-				coeff = num;
-			coeff_flag = 1;
-		}
-		if (!*cmdline || *cmdline == ',') {
-			if (!coeff_flag)
-				coeff = 1;
-			/*
-			 * Round down to the nearest FAKE_NODE_MIN_SIZE.
-			 * Command-line coefficients are in megabytes.
-			 */
-			size = ((u64)num << 20) & FAKE_NODE_MIN_HASH_MASK;
-			if (size)
-				for (i = 0; i < coeff; i++, num_nodes++)
-					if (setup_node_range(num_nodes, nodes,
-						&addr, size, max_addr) < 0)
-						goto done;
-			if (!*cmdline)
-				break;
-			coeff_flag = 0;
-			coeff = -1;
-		}
-		num = 0;
-	}
-done:
-	if (!num_nodes)
-		return -1;
-	/* Fill remainder of system RAM, if appropriate. */
-	if (addr < max_addr) {
-		if (coeff_flag && coeff < 0) {
-			/* Split remaining nodes into num-sized chunks */
-			num_nodes += split_nodes_by_size(nodes, &addr, max_addr,
-							 num_nodes, num);
-			goto out;
-		}
-		switch (*(cmdline - 1)) {
-		case '*':
-			/* Split remaining nodes into coeff chunks */
-			if (coeff <= 0)
-				break;
-			num_nodes += split_nodes_equally(nodes, &addr, max_addr,
-							 num_nodes, coeff);
-			break;
-		case ',':
-			/* Do not allocate remaining system RAM */
-			break;
-		default:
-			/* Give one final node */
-			setup_node_range(num_nodes, nodes, &addr,
-					 max_addr - addr, max_addr);
-			num_nodes++;
-		}
-	}
-out:
-	memnode_shift = compute_hash_shift(nodes, num_nodes);
-	if (memnode_shift < 0) {
-		memnode_shift = 0;
-		printk(KERN_ERR "No NUMA hash function found.  NUMA emulation "
-		       "disabled.\n");
-		return -1;
-	}
-
-	/*
-	 * We need to vacate all active ranges that may have been registered by
-	 * SRAT and set acpi_numa to -1 so that srat_disabled() always returns
-	 * true.  NUMA emulation has succeeded so we will not scan ACPI nodes.
-	 */
-	remove_all_active_ranges();
-#ifdef CONFIG_ACPI_NUMA
-	acpi_numa = -1;
-#endif
-	for_each_node_mask(i, node_possible_map) {
-		e820_register_active_regions(i, nodes[i].start >> PAGE_SHIFT,
-						nodes[i].end >> PAGE_SHIFT);
- 		setup_node_bootmem(i, nodes[i].start, nodes[i].end);
-	}
-	acpi_fake_nodes(nodes, num_nodes);
- 	numa_init_array();
- 	return 0;
-}
-#endif /* CONFIG_NUMA_EMU */
-
-void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
-{ 
-	int i;
-
-	nodes_clear(node_possible_map);
-
-#ifdef CONFIG_NUMA_EMU
-	if (cmdline && !numa_emulation(start_pfn, end_pfn))
- 		return;
-	nodes_clear(node_possible_map);
-#endif
-
-#ifdef CONFIG_ACPI_NUMA
-	if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
-					  end_pfn << PAGE_SHIFT))
- 		return;
-	nodes_clear(node_possible_map);
-#endif
-
-#ifdef CONFIG_K8_NUMA
-	if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
-		return;
-	nodes_clear(node_possible_map);
-#endif
-	printk(KERN_INFO "%s\n",
-	       numa_off ? "NUMA turned off" : "No NUMA configuration found");
-
-	printk(KERN_INFO "Faking a node at %016lx-%016lx\n", 
-	       start_pfn << PAGE_SHIFT,
-	       end_pfn << PAGE_SHIFT); 
-		/* setup dummy node covering all memory */ 
-	memnode_shift = 63; 
-	memnodemap = memnode.embedded_map;
-	memnodemap[0] = 0;
-	nodes_clear(node_online_map);
-	node_set_online(0);
-	node_set(0, node_possible_map);
-	for (i = 0; i < NR_CPUS; i++)
-		numa_set_node(i, 0);
-	node_to_cpumask[0] = cpumask_of_cpu(0);
-	e820_register_active_regions(0, start_pfn, end_pfn);
-	setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
-}
-
-__cpuinit void numa_add_cpu(int cpu)
-{
-	set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
-} 
-
-void __cpuinit numa_set_node(int cpu, int node)
-{
-	cpu_pda(cpu)->nodenumber = node;
-	cpu_to_node[cpu] = node;
-}
-
-unsigned long __init numa_free_all_bootmem(void) 
-{ 
-	int i;
-	unsigned long pages = 0;
-	for_each_online_node(i) {
-		pages += free_all_bootmem_node(NODE_DATA(i));
-	}
-	return pages;
-} 
-
-void __init paging_init(void)
-{ 
-	int i;
-	unsigned long max_zone_pfns[MAX_NR_ZONES];
-	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
-	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
-	max_zone_pfns[ZONE_NORMAL] = end_pfn;
-
-	sparse_memory_present_with_active_regions(MAX_NUMNODES);
-	sparse_init();
-
-	for_each_online_node(i) {
-		setup_node_zones(i); 
-	}
-
-	free_area_init_nodes(max_zone_pfns);
-} 
-
-static __init int numa_setup(char *opt)
-{ 
-	if (!opt)
-		return -EINVAL;
-	if (!strncmp(opt,"off",3))
-		numa_off = 1;
-#ifdef CONFIG_NUMA_EMU
-	if (!strncmp(opt, "fake=", 5))
-		cmdline = opt + 5;
-#endif
-#ifdef CONFIG_ACPI_NUMA
- 	if (!strncmp(opt,"noacpi",6))
- 		acpi_numa = -1;
-	if (!strncmp(opt,"hotadd=", 7))
-		hotadd_percent = simple_strtoul(opt+7, NULL, 10);
-#endif
-	return 0;
-} 
-
-early_param("numa", numa_setup);
-
-/*
- * Setup early cpu_to_node.
- *
- * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
- * and apicid_to_node[] tables have valid entries for a CPU.
- * This means we skip cpu_to_node[] initialisation for NUMA
- * emulation and faking node case (when running a kernel compiled
- * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
- * is already initialized in a round robin manner at numa_init_array,
- * prior to this call, and this initialization is good enough
- * for the fake NUMA cases.
- */
-void __init init_cpu_to_node(void)
-{
-	int i;
- 	for (i = 0; i < NR_CPUS; i++) {
-		u8 apicid = x86_cpu_to_apicid[i];
-		if (apicid == BAD_APICID)
-			continue;
-		if (apicid_to_node[apicid] == NUMA_NO_NODE)
-			continue;
-		numa_set_node(i,apicid_to_node[apicid]);
-	}
-}
-
-EXPORT_SYMBOL(cpu_to_node);
-EXPORT_SYMBOL(node_to_cpumask);
-EXPORT_SYMBOL(memnode);
-EXPORT_SYMBOL(node_data);
-
-#ifdef CONFIG_DISCONTIGMEM
-/*
- * Functions to convert PFNs from/to per node page addresses.
- * These are out of line because they are quite big.
- * They could be all tuned by pre caching more state.
- * Should do that.
- */
-
-int pfn_valid(unsigned long pfn)
-{
-	unsigned nid;
-	if (pfn >= num_physpages)
-		return 0;
-	nid = pfn_to_nid(pfn);
-	if (nid == 0xff)
-		return 0;
-	return pfn >= node_start_pfn(nid) && (pfn) < node_end_pfn(nid);
-}
-EXPORT_SYMBOL(pfn_valid);
-#endif