Linux-2.6.12-rc2v2.6.12-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, 294 insertions, 0 deletions

diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
new file mode 100644
index 000000000000..fd9f25d7a6c4
--- /dev/null
+++ b/arch/x86_64/mm/numa.c
@@ -0,0 +1,294 @@
+/* 
+ * 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];
+bootmem_data_t plat_node_bdata[MAX_NUMNODES];
+
+int memnode_shift;
+u8  memnodemap[NODEMAPSIZE];
+
+unsigned char cpu_to_node[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
+cpumask_t     node_to_cpumask[MAX_NUMNODES];
+
+int numa_off __initdata;
+
+int __init compute_hash_shift(struct node *nodes, int numnodes)
+{
+	int i; 
+	int shift = 24;
+	u64 addr;
+	
+	/* When in doubt use brute force. */
+	while (shift < 48) { 
+		memset(memnodemap,0xff,sizeof(*memnodemap) * NODEMAPSIZE); 
+		for (i = 0; i < numnodes; i++) {
+			if (nodes[i].start == nodes[i].end) 
+				continue;
+			for (addr = nodes[i].start; 
+			     addr < nodes[i].end; 
+			     addr += (1UL << shift)) {
+				if (memnodemap[addr >> shift] != 0xff && 
+				    memnodemap[addr >> shift] != i) { 
+					printk(KERN_INFO 
+					    "node %d shift %d addr %Lx conflict %d\n", 
+					       i, shift, addr, memnodemap[addr>>shift]);
+					goto next; 
+				} 
+				memnodemap[addr >> shift] = i; 
+			} 
+		} 
+		return shift; 
+	next:
+		shift++; 
+	} 
+	memset(memnodemap,0,sizeof(*memnodemap) * NODEMAPSIZE); 
+	return -1; 
+}
+
+/* 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;
+	const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE);
+
+	start = round_up(start, ZONE_ALIGN); 
+
+	printk("Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end);
+
+	start_pfn = start >> PAGE_SHIFT;
+	end_pfn = end >> PAGE_SHIFT;
+
+	nodedata_phys = find_e820_area(start, end, pgdat_size); 
+	if (nodedata_phys == -1L) 
+		panic("Cannot find memory pgdat in node %d\n", nodeid);
+
+	Dprintk("nodedata_phys %lx\n", nodedata_phys); 
+
+	node_data[nodeid] = phys_to_virt(nodedata_phys);
+	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_start = find_e820_area(bootmap_start, end, bootmap_pages<<PAGE_SHIFT);
+	if (bootmap_start == -1L) 
+		panic("Not enough continuous space for bootmap on node %d", nodeid); 
+	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); 
+
+	e820_bootmem_free(NODE_DATA(nodeid), start, end);
+
+	reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size); 
+	reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT);
+	node_set_online(nodeid);
+} 
+
+/* Initialize final allocator for a zone */
+void __init setup_node_zones(int nodeid)
+{ 
+	unsigned long start_pfn, end_pfn; 
+	unsigned long zones[MAX_NR_ZONES];
+	unsigned long dma_end_pfn;
+
+	memset(zones, 0, sizeof(unsigned long) * MAX_NR_ZONES); 
+
+	start_pfn = node_start_pfn(nodeid);
+	end_pfn = node_end_pfn(nodeid);
+
+	Dprintk(KERN_INFO "setting up node %d %lx-%lx\n", nodeid, start_pfn, end_pfn);
+	
+	/* All nodes > 0 have a zero length zone DMA */ 
+	dma_end_pfn = __pa(MAX_DMA_ADDRESS) >> PAGE_SHIFT; 
+	if (start_pfn < dma_end_pfn) { 
+		zones[ZONE_DMA] = dma_end_pfn - start_pfn;
+		zones[ZONE_NORMAL] = end_pfn - dma_end_pfn; 
+	} else { 
+		zones[ZONE_NORMAL] = end_pfn - start_pfn; 
+	} 
+    
+	free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
+			    start_pfn, NULL); 
+} 
+
+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 = 0;
+	for (i = 0; i < NR_CPUS; i++) {
+		if (cpu_to_node[i] != NUMA_NO_NODE)
+			continue;
+		rr = next_node(rr, node_online_map);
+		if (rr == MAX_NUMNODES)
+			rr = first_node(node_online_map);
+		cpu_to_node[i] = rr;
+		rr++; 
+	}
+
+	set_bit(0, &node_to_cpumask[cpu_to_node(0)]);
+}
+
+#ifdef CONFIG_NUMA_EMU
+int numa_fake __initdata = 0;
+
+/* Numa emulation */
+static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
+{
+ 	int i;
+ 	struct node nodes[MAX_NUMNODES];
+ 	unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake;
+
+ 	/* Kludge needed for the hash function */
+ 	if (hweight64(sz) > 1) {
+ 		unsigned long x = 1;
+ 		while ((x << 1) < sz)
+ 			x <<= 1;
+ 		if (x < sz/2)
+ 			printk("Numa emulation unbalanced. Complain to maintainer\n");
+ 		sz = x;
+ 	}
+
+ 	memset(&nodes,0,sizeof(nodes));
+ 	for (i = 0; i < numa_fake; i++) {
+ 		nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz;
+ 		if (i == numa_fake-1)
+ 			sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start;
+ 		nodes[i].end = nodes[i].start + sz;
+ 		if (i != numa_fake-1)
+ 			nodes[i].end--;
+ 		printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n",
+ 		       i,
+ 		       nodes[i].start, nodes[i].end,
+ 		       (nodes[i].end - nodes[i].start) >> 20);
+		node_set_online(i);
+ 	}
+ 	memnode_shift = compute_hash_shift(nodes, numa_fake);
+ 	if (memnode_shift < 0) {
+ 		memnode_shift = 0;
+ 		printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n");
+ 		return -1;
+ 	}
+ 	for_each_online_node(i)
+ 		setup_node_bootmem(i, nodes[i].start, nodes[i].end);
+ 	numa_init_array();
+ 	return 0;
+}
+#endif
+
+void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
+{ 
+	int i;
+
+#ifdef CONFIG_NUMA_EMU
+	if (numa_fake && !numa_emulation(start_pfn, end_pfn))
+ 		return;
+#endif
+
+#ifdef CONFIG_ACPI_NUMA
+	if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
+					  end_pfn << PAGE_SHIFT))
+ 		return;
+#endif
+
+#ifdef CONFIG_K8_NUMA
+	if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
+		return;
+#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[0] = 0;
+	nodes_clear(node_online_map);
+	node_set_online(0);
+	for (i = 0; i < NR_CPUS; i++)
+		cpu_to_node[i] = 0;
+	node_to_cpumask[0] = cpumask_of_cpu(0);
+	setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
+}
+
+__init void numa_add_cpu(int cpu)
+{
+	/* BP is initialized elsewhere */
+	if (cpu) 
+		set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
+} 
+
+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;
+	for_each_online_node(i) {
+		setup_node_zones(i); 
+	}
+} 
+
+/* [numa=off] */
+__init int numa_setup(char *opt) 
+{ 
+	if (!strncmp(opt,"off",3))
+		numa_off = 1;
+#ifdef CONFIG_NUMA_EMU
+	if(!strncmp(opt, "fake=", 5)) {
+		numa_fake = simple_strtoul(opt+5,NULL,0); ;
+		if (numa_fake >= MAX_NUMNODES)
+			numa_fake = MAX_NUMNODES;
+	}
+#endif
+#ifdef CONFIG_ACPI_NUMA
+ 	if (!strncmp(opt,"noacpi",6))
+ 		acpi_numa = -1;
+#endif
+	return 1;
+} 
+
+EXPORT_SYMBOL(cpu_to_node);
+EXPORT_SYMBOL(node_to_cpumask);
+EXPORT_SYMBOL(memnode_shift);
+EXPORT_SYMBOL(memnodemap);
+EXPORT_SYMBOL(node_data);