x86: rename discontig_32.c to numa_32.c

name it in line with its purpose.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 444 insertions, 0 deletions

diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
new file mode 100644
index 000000000000..847c164725f4
--- /dev/null
+++ b/arch/x86/mm/numa_32.c
@@ -0,0 +1,444 @@
+/*
+ * Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation
+ * August 2002: added remote node KVA remap - Martin J. Bligh 
+ *
+ * Copyright (C) 2002, IBM Corp.
+ *
+ * All rights reserved.          
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/mmzone.h>
+#include <linux/highmem.h>
+#include <linux/initrd.h>
+#include <linux/nodemask.h>
+#include <linux/module.h>
+#include <linux/kexec.h>
+#include <linux/pfn.h>
+#include <linux/swap.h>
+#include <linux/acpi.h>
+
+#include <asm/e820.h>
+#include <asm/setup.h>
+#include <asm/mmzone.h>
+#include <asm/bios_ebda.h>
+#include <asm/proto.h>
+
+struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
+EXPORT_SYMBOL(node_data);
+
+/*
+ * numa interface - we expect the numa architecture specific code to have
+ *                  populated the following initialisation.
+ *
+ * 1) node_online_map  - the map of all nodes configured (online) in the system
+ * 2) node_start_pfn   - the starting page frame number for a node
+ * 3) node_end_pfn     - the ending page fram number for a node
+ */
+unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
+unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
+
+
+#ifdef CONFIG_DISCONTIGMEM
+/*
+ * 4) physnode_map     - the mapping between a pfn and owning node
+ * physnode_map keeps track of the physical memory layout of a generic
+ * numa node on a 64Mb break (each element of the array will
+ * represent 64Mb of memory and will be marked by the node id.  so,
+ * if the first gig is on node 0, and the second gig is on node 1
+ * physnode_map will contain:
+ *
+ *     physnode_map[0-15] = 0;
+ *     physnode_map[16-31] = 1;
+ *     physnode_map[32- ] = -1;
+ */
+s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
+EXPORT_SYMBOL(physnode_map);
+
+void memory_present(int nid, unsigned long start, unsigned long end)
+{
+	unsigned long pfn;
+
+	printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
+			nid, start, end);
+	printk(KERN_DEBUG "  Setting physnode_map array to node %d for pfns:\n", nid);
+	printk(KERN_DEBUG "  ");
+	for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
+		physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
+		printk(KERN_CONT "%lx ", pfn);
+	}
+	printk(KERN_CONT "\n");
+}
+
+unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
+					      unsigned long end_pfn)
+{
+	unsigned long nr_pages = end_pfn - start_pfn;
+
+	if (!nr_pages)
+		return 0;
+
+	return (nr_pages + 1) * sizeof(struct page);
+}
+#endif
+
+extern unsigned long find_max_low_pfn(void);
+extern unsigned long highend_pfn, highstart_pfn;
+
+#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
+
+unsigned long node_remap_size[MAX_NUMNODES];
+static void *node_remap_start_vaddr[MAX_NUMNODES];
+void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
+
+static unsigned long kva_start_pfn;
+static unsigned long kva_pages;
+/*
+ * FLAT - support for basic PC memory model with discontig enabled, essentially
+ *        a single node with all available processors in it with a flat
+ *        memory map.
+ */
+int __init get_memcfg_numa_flat(void)
+{
+	printk(KERN_DEBUG "NUMA - single node, flat memory mode\n");
+
+	node_start_pfn[0] = 0;
+	node_end_pfn[0] = max_pfn;
+	e820_register_active_regions(0, 0, max_pfn);
+	memory_present(0, 0, max_pfn);
+	node_remap_size[0] = node_memmap_size_bytes(0, 0, max_pfn);
+
+        /* Indicate there is one node available. */
+	nodes_clear(node_online_map);
+	node_set_online(0);
+	return 1;
+}
+
+/*
+ * Find the highest page frame number we have available for the node
+ */
+static void __init propagate_e820_map_node(int nid)
+{
+	if (node_end_pfn[nid] > max_pfn)
+		node_end_pfn[nid] = max_pfn;
+	/*
+	 * if a user has given mem=XXXX, then we need to make sure 
+	 * that the node _starts_ before that, too, not just ends
+	 */
+	if (node_start_pfn[nid] > max_pfn)
+		node_start_pfn[nid] = max_pfn;
+	BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]);
+}
+
+/* 
+ * Allocate memory for the pg_data_t for this node via a crude pre-bootmem
+ * method.  For node zero take this from the bottom of memory, for
+ * subsequent nodes place them at node_remap_start_vaddr which contains
+ * node local data in physically node local memory.  See setup_memory()
+ * for details.
+ */
+static void __init allocate_pgdat(int nid)
+{
+	char buf[16];
+
+	if (node_has_online_mem(nid) && node_remap_start_vaddr[nid])
+		NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
+	else {
+		unsigned long pgdat_phys;
+		pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
+				 max_pfn_mapped<<PAGE_SHIFT,
+				 sizeof(pg_data_t),
+				 PAGE_SIZE);
+		NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
+		memset(buf, 0, sizeof(buf));
+		sprintf(buf, "NODE_DATA %d",  nid);
+		reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf);
+	}
+	printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n",
+		nid, (unsigned long)NODE_DATA(nid));
+}
+
+/*
+ * In the DISCONTIGMEM and SPARSEMEM memory model, a portion of the kernel
+ * virtual address space (KVA) is reserved and portions of nodes are mapped
+ * using it. This is to allow node-local memory to be allocated for
+ * structures that would normally require ZONE_NORMAL. The memory is
+ * allocated with alloc_remap() and callers should be prepared to allocate
+ * from the bootmem allocator instead.
+ */
+static unsigned long node_remap_start_pfn[MAX_NUMNODES];
+static void *node_remap_end_vaddr[MAX_NUMNODES];
+static void *node_remap_alloc_vaddr[MAX_NUMNODES];
+static unsigned long node_remap_offset[MAX_NUMNODES];
+
+void *alloc_remap(int nid, unsigned long size)
+{
+	void *allocation = node_remap_alloc_vaddr[nid];
+
+	size = ALIGN(size, L1_CACHE_BYTES);
+
+	if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])
+		return 0;
+
+	node_remap_alloc_vaddr[nid] += size;
+	memset(allocation, 0, size);
+
+	return allocation;
+}
+
+static void __init remap_numa_kva(void)
+{
+	void *vaddr;
+	unsigned long pfn;
+	int node;
+
+	for_each_online_node(node) {
+		printk(KERN_DEBUG "remap_numa_kva: node %d\n", node);
+		for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
+			vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
+			printk(KERN_DEBUG "remap_numa_kva: %08lx to pfn %08lx\n",
+				(unsigned long)vaddr,
+				node_remap_start_pfn[node] + pfn);
+			set_pmd_pfn((ulong) vaddr, 
+				node_remap_start_pfn[node] + pfn, 
+				PAGE_KERNEL_LARGE);
+		}
+	}
+}
+
+static unsigned long calculate_numa_remap_pages(void)
+{
+	int nid;
+	unsigned long size, reserve_pages = 0;
+
+	for_each_online_node(nid) {
+		u64 node_kva_target;
+		u64 node_kva_final;
+
+		/*
+		 * The acpi/srat node info can show hot-add memroy zones
+		 * where memory could be added but not currently present.
+		 */
+		printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n",
+			nid, node_start_pfn[nid], node_end_pfn[nid]);
+		if (node_start_pfn[nid] > max_pfn)
+			continue;
+		if (!node_end_pfn[nid])
+			continue;
+		if (node_end_pfn[nid] > max_pfn)
+			node_end_pfn[nid] = max_pfn;
+
+		/* ensure the remap includes space for the pgdat. */
+		size = node_remap_size[nid] + sizeof(pg_data_t);
+
+		/* convert size to large (pmd size) pages, rounding up */
+		size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
+		/* now the roundup is correct, convert to PAGE_SIZE pages */
+		size = size * PTRS_PER_PTE;
+
+		node_kva_target = round_down(node_end_pfn[nid] - size,
+						 PTRS_PER_PTE);
+		node_kva_target <<= PAGE_SHIFT;
+		do {
+			node_kva_final = find_e820_area(node_kva_target,
+					((u64)node_end_pfn[nid])<<PAGE_SHIFT,
+						((u64)size)<<PAGE_SHIFT,
+						LARGE_PAGE_BYTES);
+			node_kva_target -= LARGE_PAGE_BYTES;
+		} while (node_kva_final == -1ULL &&
+			 (node_kva_target>>PAGE_SHIFT) > (node_start_pfn[nid]));
+
+		if (node_kva_final == -1ULL)
+			panic("Can not get kva ram\n");
+
+		node_remap_size[nid] = size;
+		node_remap_offset[nid] = reserve_pages;
+		reserve_pages += size;
+		printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of"
+				  " node %d at %llx\n",
+				size, nid, node_kva_final>>PAGE_SHIFT);
+
+		/*
+		 *  prevent kva address below max_low_pfn want it on system
+		 *  with less memory later.
+		 *  layout will be: KVA address , KVA RAM
+		 *
+		 *  we are supposed to only record the one less then max_low_pfn
+		 *  but we could have some hole in high memory, and it will only
+		 *  check page_is_ram(pfn) && !page_is_reserved_early(pfn) to decide
+		 *  to use it as free.
+		 *  So reserve_early here, hope we don't run out of that array
+		 */
+		reserve_early(node_kva_final,
+			      node_kva_final+(((u64)size)<<PAGE_SHIFT),
+			      "KVA RAM");
+
+		node_remap_start_pfn[nid] = node_kva_final>>PAGE_SHIFT;
+		remove_active_range(nid, node_remap_start_pfn[nid],
+					 node_remap_start_pfn[nid] + size);
+	}
+	printk(KERN_INFO "Reserving total of %lx pages for numa KVA remap\n",
+			reserve_pages);
+	return reserve_pages;
+}
+
+static void init_remap_allocator(int nid)
+{
+	node_remap_start_vaddr[nid] = pfn_to_kaddr(
+			kva_start_pfn + node_remap_offset[nid]);
+	node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
+		(node_remap_size[nid] * PAGE_SIZE);
+	node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
+		ALIGN(sizeof(pg_data_t), PAGE_SIZE);
+
+	printk(KERN_DEBUG "node %d will remap to vaddr %08lx - %08lx\n", nid,
+		(ulong) node_remap_start_vaddr[nid],
+		(ulong) node_remap_end_vaddr[nid]);
+}
+
+void __init initmem_init(unsigned long start_pfn,
+				  unsigned long end_pfn)
+{
+	int nid;
+	long kva_target_pfn;
+
+	/*
+	 * When mapping a NUMA machine we allocate the node_mem_map arrays
+	 * from node local memory.  They are then mapped directly into KVA
+	 * between zone normal and vmalloc space.  Calculate the size of
+	 * this space and use it to adjust the boundary between ZONE_NORMAL
+	 * and ZONE_HIGHMEM.
+	 */
+
+	get_memcfg_numa();
+
+	kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE);
+
+	kva_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE);
+	do {
+		kva_start_pfn = find_e820_area(kva_target_pfn<<PAGE_SHIFT,
+					max_low_pfn<<PAGE_SHIFT,
+					kva_pages<<PAGE_SHIFT,
+					PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT;
+		kva_target_pfn -= PTRS_PER_PTE;
+	} while (kva_start_pfn == -1UL && kva_target_pfn > min_low_pfn);
+
+	if (kva_start_pfn == -1UL)
+		panic("Can not get kva space\n");
+
+	printk(KERN_INFO "kva_start_pfn ~ %lx max_low_pfn ~ %lx\n",
+		kva_start_pfn, max_low_pfn);
+	printk(KERN_INFO "max_pfn = %lx\n", max_pfn);
+
+	/* avoid clash with initrd */
+	reserve_early(kva_start_pfn<<PAGE_SHIFT,
+		      (kva_start_pfn + kva_pages)<<PAGE_SHIFT,
+		     "KVA PG");
+#ifdef CONFIG_HIGHMEM
+	highstart_pfn = highend_pfn = max_pfn;
+	if (max_pfn > max_low_pfn)
+		highstart_pfn = max_low_pfn;
+	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+	       pages_to_mb(highend_pfn - highstart_pfn));
+	num_physpages = highend_pfn;
+	high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
+#else
+	num_physpages = max_low_pfn;
+	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
+#endif
+	printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
+			pages_to_mb(max_low_pfn));
+	printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
+			max_low_pfn, highstart_pfn);
+
+	printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n",
+			(ulong) pfn_to_kaddr(max_low_pfn));
+	for_each_online_node(nid) {
+		init_remap_allocator(nid);
+
+		allocate_pgdat(nid);
+	}
+	remap_numa_kva();
+
+	printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
+			(ulong) pfn_to_kaddr(highstart_pfn));
+	for_each_online_node(nid)
+		propagate_e820_map_node(nid);
+
+	for_each_online_node(nid)
+		memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
+
+	NODE_DATA(0)->bdata = &bootmem_node_data[0];
+	setup_bootmem_allocator();
+}
+
+void __init set_highmem_pages_init(void)
+{
+#ifdef CONFIG_HIGHMEM
+	struct zone *zone;
+	int nid;
+
+	for_each_zone(zone) {
+		unsigned long zone_start_pfn, zone_end_pfn;
+
+		if (!is_highmem(zone))
+			continue;
+
+		zone_start_pfn = zone->zone_start_pfn;
+		zone_end_pfn = zone_start_pfn + zone->spanned_pages;
+
+		nid = zone_to_nid(zone);
+		printk(KERN_INFO "Initializing %s for node %d (%08lx:%08lx)\n",
+				zone->name, nid, zone_start_pfn, zone_end_pfn);
+
+		add_highpages_with_active_regions(nid, zone_start_pfn,
+				 zone_end_pfn);
+	}
+	totalram_pages += totalhigh_pages;
+#endif
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static int paddr_to_nid(u64 addr)
+{
+	int nid;
+	unsigned long pfn = PFN_DOWN(addr);
+
+	for_each_node(nid)
+		if (node_start_pfn[nid] <= pfn &&
+		    pfn < node_end_pfn[nid])
+			return nid;
+
+	return -1;
+}
+
+/*
+ * This function is used to ask node id BEFORE memmap and mem_section's
+ * initialization (pfn_to_nid() can't be used yet).
+ * If _PXM is not defined on ACPI's DSDT, node id must be found by this.
+ */
+int memory_add_physaddr_to_nid(u64 addr)
+{
+	int nid = paddr_to_nid(addr);
+	return (nid >= 0) ? nid : 0;
+}
+
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif
+