Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 383 insertions, 0 deletions

diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
new file mode 100644
index 000000000000..1726b4096b10
--- /dev/null
+++ b/arch/i386/mm/discontig.c
@@ -0,0 +1,383 @@
+/*
+ * 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/config.h>
+#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 <asm/e820.h>
+#include <asm/setup.h>
+#include <asm/mmzone.h>
+#include <bios_ebda.h>
+
+struct pglist_data *node_data[MAX_NUMNODES];
+bootmem_data_t node0_bdata;
+
+/*
+ * numa interface - we expect the numa architecture specfic code to have
+ *                  populated the following initialisation.
+ *
+ * 1) node_online_map  - the map of all nodes configured (online) in the system
+ * 2) physnode_map     - the mapping between a pfn and owning node
+ * 3) node_start_pfn   - the starting page frame number for a node
+ * 3) node_end_pfn     - the ending page fram number for a node
+ */
+
+/*
+ * physnode_map keeps track of the physical memory layout of a generic
+ * numa node on a 256Mb break (each element of the array will
+ * represent 256Mb 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[0-3] = 0;
+ *     physnode_map[4-7] = 1;
+ *     physnode_map[8- ] = -1;
+ */
+s8 physnode_map[MAX_ELEMENTS] = { [0 ... (MAX_ELEMENTS - 1)] = -1};
+
+void memory_present(int nid, unsigned long start, unsigned long end)
+{
+	unsigned long pfn;
+
+	printk(KERN_INFO "Node: %d, start_pfn: %ld, end_pfn: %ld\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("%ld ", pfn);
+	}
+	printk("\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);
+}
+
+unsigned long node_start_pfn[MAX_NUMNODES];
+unsigned long node_end_pfn[MAX_NUMNODES];
+
+extern unsigned long find_max_low_pfn(void);
+extern void find_max_pfn(void);
+extern void one_highpage_init(struct page *, int, int);
+
+extern struct e820map e820;
+extern unsigned long init_pg_tables_end;
+extern unsigned long highend_pfn, highstart_pfn;
+extern unsigned long max_low_pfn;
+extern unsigned long totalram_pages;
+extern unsigned long totalhigh_pages;
+
+#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
+
+unsigned long node_remap_start_pfn[MAX_NUMNODES];
+unsigned long node_remap_size[MAX_NUMNODES];
+unsigned long node_remap_offset[MAX_NUMNODES];
+void *node_remap_start_vaddr[MAX_NUMNODES];
+void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
+
+/*
+ * 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("NUMA - single node, flat memory mode\n");
+
+	/* Run the memory configuration and find the top of memory. */
+	find_max_pfn();
+	node_start_pfn[0] = 0;
+	node_end_pfn[0] = max_pfn;
+	memory_present(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 find_max_pfn_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;
+	if (node_start_pfn[nid] > node_end_pfn[nid])
+		BUG();
+}
+
+/* 
+ * 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)
+{
+	if (nid && node_has_online_mem(nid))
+		NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
+	else {
+		NODE_DATA(nid) = (pg_data_t *)(__va(min_low_pfn << PAGE_SHIFT));
+		min_low_pfn += PFN_UP(sizeof(pg_data_t));
+	}
+}
+
+void __init remap_numa_kva(void)
+{
+	void *vaddr;
+	unsigned long pfn;
+	int node;
+
+	for_each_online_node(node) {
+		if (node == 0)
+			continue;
+		for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
+			vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
+			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) {
+		if (nid == 0)
+			continue;
+		if (!node_remap_size[nid])
+			continue;
+
+		/*
+		 * The acpi/srat node info can show hot-add memroy zones
+		 * where memory could be added but not currently present.
+		 */
+		if (node_start_pfn[nid] > max_pfn)
+			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;
+		printk("Reserving %ld pages of KVA for lmem_map of node %d\n",
+				size, nid);
+		node_remap_size[nid] = size;
+		reserve_pages += size;
+		node_remap_offset[nid] = reserve_pages;
+		printk("Shrinking node %d from %ld pages to %ld pages\n",
+			nid, node_end_pfn[nid], node_end_pfn[nid] - size);
+		node_end_pfn[nid] -= size;
+		node_remap_start_pfn[nid] = node_end_pfn[nid];
+	}
+	printk("Reserving total of %ld pages for numa KVA remap\n",
+			reserve_pages);
+	return reserve_pages;
+}
+
+extern void setup_bootmem_allocator(void);
+unsigned long __init setup_memory(void)
+{
+	int nid;
+	unsigned long system_start_pfn, system_max_low_pfn;
+	unsigned long reserve_pages;
+
+	/*
+	 * 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 boundry between ZONE_NORMAL
+	 * and ZONE_HIGHMEM.
+	 */
+	find_max_pfn();
+	get_memcfg_numa();
+
+	reserve_pages = calculate_numa_remap_pages();
+
+	/* partially used pages are not usable - thus round upwards */
+	system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
+
+	system_max_low_pfn = max_low_pfn = find_max_low_pfn() - reserve_pages;
+	printk("reserve_pages = %ld find_max_low_pfn() ~ %ld\n",
+			reserve_pages, max_low_pfn + reserve_pages);
+	printk("max_pfn = %ld\n", max_pfn);
+#ifdef CONFIG_HIGHMEM
+	highstart_pfn = highend_pfn = max_pfn;
+	if (max_pfn > system_max_low_pfn)
+		highstart_pfn = system_max_low_pfn;
+	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+	       pages_to_mb(highend_pfn - highstart_pfn));
+#endif
+	printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
+			pages_to_mb(system_max_low_pfn));
+	printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n", 
+			min_low_pfn, max_low_pfn, highstart_pfn);
+
+	printk("Low memory ends at vaddr %08lx\n",
+			(ulong) pfn_to_kaddr(max_low_pfn));
+	for_each_online_node(nid) {
+		node_remap_start_vaddr[nid] = pfn_to_kaddr(
+			(highstart_pfn + reserve_pages) - node_remap_offset[nid]);
+		allocate_pgdat(nid);
+		printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
+			(ulong) node_remap_start_vaddr[nid],
+			(ulong) pfn_to_kaddr(highstart_pfn + reserve_pages
+			    - node_remap_offset[nid] + node_remap_size[nid]));
+	}
+	printk("High memory starts at vaddr %08lx\n",
+			(ulong) pfn_to_kaddr(highstart_pfn));
+	vmalloc_earlyreserve = reserve_pages * PAGE_SIZE;
+	for_each_online_node(nid)
+		find_max_pfn_node(nid);
+
+	memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
+	NODE_DATA(0)->bdata = &node0_bdata;
+	setup_bootmem_allocator();
+	return max_low_pfn;
+}
+
+void __init zone_sizes_init(void)
+{
+	int nid;
+
+	/*
+	 * Insert nodes into pgdat_list backward so they appear in order.
+	 * Clobber node 0's links and NULL out pgdat_list before starting.
+	 */
+	pgdat_list = NULL;
+	for (nid = MAX_NUMNODES - 1; nid >= 0; nid--) {
+		if (!node_online(nid))
+			continue;
+		NODE_DATA(nid)->pgdat_next = pgdat_list;
+		pgdat_list = NODE_DATA(nid);
+	}
+
+	for_each_online_node(nid) {
+		unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+		unsigned long *zholes_size;
+		unsigned int max_dma;
+
+		unsigned long low = max_low_pfn;
+		unsigned long start = node_start_pfn[nid];
+		unsigned long high = node_end_pfn[nid];
+
+		max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+
+		if (node_has_online_mem(nid)){
+			if (start > low) {
+#ifdef CONFIG_HIGHMEM
+				BUG_ON(start > high);
+				zones_size[ZONE_HIGHMEM] = high - start;
+#endif
+			} else {
+				if (low < max_dma)
+					zones_size[ZONE_DMA] = low;
+				else {
+					BUG_ON(max_dma > low);
+					BUG_ON(low > high);
+					zones_size[ZONE_DMA] = max_dma;
+					zones_size[ZONE_NORMAL] = low - max_dma;
+#ifdef CONFIG_HIGHMEM
+					zones_size[ZONE_HIGHMEM] = high - low;
+#endif
+				}
+			}
+		}
+
+		zholes_size = get_zholes_size(nid);
+		/*
+		 * We let the lmem_map for node 0 be allocated from the
+		 * normal bootmem allocator, but other nodes come from the
+		 * remapped KVA area - mbligh
+		 */
+		if (!nid)
+			free_area_init_node(nid, NODE_DATA(nid),
+					zones_size, start, zholes_size);
+		else {
+			unsigned long lmem_map;
+			lmem_map = (unsigned long)node_remap_start_vaddr[nid];
+			lmem_map += sizeof(pg_data_t) + PAGE_SIZE - 1;
+			lmem_map &= PAGE_MASK;
+			NODE_DATA(nid)->node_mem_map = (struct page *)lmem_map;
+			free_area_init_node(nid, NODE_DATA(nid), zones_size,
+				start, zholes_size);
+		}
+	}
+	return;
+}
+
+void __init set_highmem_pages_init(int bad_ppro) 
+{
+#ifdef CONFIG_HIGHMEM
+	struct zone *zone;
+
+	for_each_zone(zone) {
+		unsigned long node_pfn, node_high_size, zone_start_pfn;
+		struct page * zone_mem_map;
+		
+		if (!is_highmem(zone))
+			continue;
+
+		printk("Initializing %s for node %d\n", zone->name,
+			zone->zone_pgdat->node_id);
+
+		node_high_size = zone->spanned_pages;
+		zone_mem_map = zone->zone_mem_map;
+		zone_start_pfn = zone->zone_start_pfn;
+
+		for (node_pfn = 0; node_pfn < node_high_size; node_pfn++) {
+			one_highpage_init((struct page *)(zone_mem_map + node_pfn),
+					  zone_start_pfn + node_pfn, bad_ppro);
+		}
+	}
+	totalram_pages += totalhigh_pages;
+#endif
+}