patch-2.4.23 linux-2.4.23/arch/ia64/mm/discontig.c

• Lines: 283
• Date: 2003-11-28 10:26:19.000000000 -0800
• Orig file: linux-2.4.22/arch/ia64/mm/discontig.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.22/arch/ia64/mm/discontig.c linux-2.4.23/arch/ia64/mm/discontig.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (c) 2000, 2003 Silicon Graphics, Inc.  All rights reserved.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 Tony Luck <tony.luck@intel.com>
+ * Copyright (c) 2002 NEC Corp.
+ * Copyright (c) 2002 Kimio Suganuma <k-suganuma@da.jp.nec.com>
+ */
+
+/*
+ * Platform initialization for Discontig Memory
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/mmzone.h>
+#include <linux/acpi.h>
+#include <linux/efi.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+
+
+/*
+ * Round an address upward to the next multiple of GRANULE size.
+ */
+#define GRANULEROUNDDOWN(n) ((n) & ~(IA64_GRANULE_SIZE-1))
+#define GRANULEROUNDUP(n) (((n)+IA64_GRANULE_SIZE-1) & ~(IA64_GRANULE_SIZE-1))
+
+/*
+ * Used to locate BOOT_DATA prior to initializing the node data area.
+ */
+#define BOOT_NODE_DATA(node)	pg_data_ptr[node]
+
+/*
+ * To prevent cache aliasing effects, align per-node structures so that they 
+ * start at addresses that are strided by node number.
+ */
+#define NODEDATA_ALIGN(addr, node)	((((addr) + 1024*1024-1) & ~(1024*1024-1)) + (node)*PAGE_SIZE)
+
+
+static struct ia64_node_data	*boot_node_data[NR_NODES] __initdata;
+static pg_data_t		*pg_data_ptr[NR_NODES] __initdata;
+static bootmem_data_t		bdata[NR_NODES] __initdata;
+static unsigned long		boot_pernode[NR_NODES] __initdata;
+static unsigned long		boot_pernodesize[NR_NODES] __initdata;
+
+extern int  filter_rsvd_memory (unsigned long start, unsigned long end, void *arg);
+extern struct cpuinfo_ia64 *_cpu_data[NR_CPUS];
+
+
+
+/*
+ * We allocate one of the bootmem_data_t structs for each piece of memory
+ * that we wish to treat as a contiguous block.  Each such block must start
+ * on a GRANULE boundary.  Multiple banks per node is not supported.
+ *   (Note: on SN2, all memory on a node is trated as a single bank.
+ *   Holes within the bank are supported. This works because memory
+ *   from different banks is not interleaved. The bootmap bitmap
+ *   for the node is somewhat large but not too large).
+ */
+static int __init
+build_maps(unsigned long start, unsigned long end, int node)
+{
+	bootmem_data_t	*bdp;
+	unsigned long cstart, epfn;
+
+	bdp = &bdata[node];
+	epfn = GRANULEROUNDUP(__pa(end)) >> PAGE_SHIFT;
+	cstart = GRANULEROUNDDOWN(__pa(start));
+
+	if (!bdp->node_low_pfn) {
+		bdp->node_boot_start = cstart;
+		bdp->node_low_pfn = epfn;
+	} else {
+		bdp->node_boot_start = min(cstart, bdp->node_boot_start);
+		bdp->node_low_pfn = max(epfn, bdp->node_low_pfn);
+	}
+
+	min_low_pfn = min(min_low_pfn, bdp->node_boot_start>>PAGE_SHIFT);
+	max_low_pfn = max(max_low_pfn, bdp->node_low_pfn);
+
+	return 0;
+}
+
+
+/*
+ * Count the number of cpus on the node
+ */
+static __inline__ int
+count_cpus(int node)
+{
+	int cpu, n=0;
+
+	for (cpu=0; cpu < NR_CPUS; cpu++)
+		if (node == node_cpuid[cpu].nid)
+			n++;
+	return n;
+}
+
+
+/*
+ * Find space on each node for the bootmem map & other per-node data structures.
+ *
+ * Called by efi_memmap_walk to find boot memory on each node. Note that
+ * only blocks that are free are passed to this routine (currently filtered by
+ * free_available_memory).
+ */
+static int __init
+find_pernode_space(unsigned long start, unsigned long end, int node)
+{
+	unsigned long	mapsize, pages, epfn, map=0, cpu, cpus;
+	unsigned long	pernodesize=0, pernode;
+	unsigned long	cpu_data, mmu_gathers;
+	unsigned long	pstart, length;
+	bootmem_data_t	*bdp;
+
+	pstart = __pa(start);
+	length = end - start;
+	epfn = (pstart + length) >> PAGE_SHIFT;
+	bdp = &bdata[node];
+
+	if (pstart < bdp->node_boot_start || epfn > bdp->node_low_pfn)
+		return 0;
+
+	if (!boot_pernode[node]) {
+		cpus = count_cpus(node);
+		pernodesize += PAGE_ALIGN(sizeof(struct cpuinfo_ia64)) * cpus;
+		pernodesize += L1_CACHE_ALIGN(sizeof(mmu_gather_t)) * cpus;
+		pernodesize += L1_CACHE_ALIGN(sizeof(pg_data_t));
+		pernodesize += L1_CACHE_ALIGN(sizeof(struct ia64_node_data));
+		pernodesize = PAGE_ALIGN(pernodesize);
+		pernode = NODEDATA_ALIGN(pstart, node);
+	
+		if (pstart + length > (pernode + pernodesize)) {
+			boot_pernode[node] = pernode;
+			boot_pernodesize[node] = pernodesize;
+			memset(__va(pernode), 0, pernodesize);
+
+			cpu_data = pernode;
+			pernode += PAGE_ALIGN(sizeof(struct cpuinfo_ia64)) * cpus;
+
+			mmu_gathers = pernode;
+			pernode += L1_CACHE_ALIGN(sizeof(mmu_gather_t)) * cpus;
+
+			pg_data_ptr[node] = __va(pernode);
+			pernode += L1_CACHE_ALIGN(sizeof(pg_data_t));
+
+			boot_node_data[node] = __va(pernode);
+			pernode += L1_CACHE_ALIGN(sizeof(struct ia64_node_data));
+
+			pg_data_ptr[node]->bdata = &bdata[node];
+			pernode += L1_CACHE_ALIGN(sizeof(pg_data_t));
+
+			for (cpu=0; cpu < NR_CPUS; cpu++) {
+				if (node == node_cpuid[cpu].nid) {
+					_cpu_data[cpu] = __va(cpu_data);
+					_cpu_data[cpu]->node_data = boot_node_data[node];
+					_cpu_data[cpu]->nodeid = node;
+					_cpu_data[cpu]->mmu_gathers = __va(mmu_gathers);
+					cpu_data +=  PAGE_ALIGN(sizeof(struct cpuinfo_ia64));
+					mmu_gathers += L1_CACHE_ALIGN(sizeof(mmu_gather_t));
+				}
+			}
+
+		}
+	}
+
+	pernode = boot_pernode[node];
+	pernodesize = boot_pernodesize[node];
+	if (pernode && !bdp->node_bootmem_map) {
+		pages = bdp->node_low_pfn - (bdp->node_boot_start>>PAGE_SHIFT);
+		mapsize = bootmem_bootmap_pages(pages) << PAGE_SHIFT;
+
+		if (pernode - pstart > mapsize)
+			map = pstart;
+		else if (pstart + length - pernode - pernodesize > mapsize)
+			map = pernode + pernodesize;
+
+		if (map) {
+			init_bootmem_node(
+				BOOT_NODE_DATA(node),
+				map>>PAGE_SHIFT, 
+				bdp->node_boot_start>>PAGE_SHIFT,
+				bdp->node_low_pfn);
+		}
+
+	}
+
+	return 0;
+}
+
+
+/*
+ * Free available memory to the bootmem allocator.
+ *
+ * Note that only blocks that are free are passed to this routine (currently 
+ * filtered by free_available_memory).
+ *
+ */
+static int __init
+discontig_free_bootmem_node(unsigned long start, unsigned long end, int node)
+{
+	free_bootmem_node(BOOT_NODE_DATA(node), __pa(start), end - start);
+
+	return 0;
+}
+
+
+/*
+ * Reserve the space used by the bootmem maps.
+ */
+static void __init
+discontig_reserve_bootmem(void)
+{
+	int		node;
+	unsigned long	base, size, pages;
+	bootmem_data_t	*bdp;
+
+	for (node = 0; node < numnodes; node++) {
+		bdp = BOOT_NODE_DATA(node)->bdata;
+
+		pages = bdp->node_low_pfn - (bdp->node_boot_start>>PAGE_SHIFT);
+		size = bootmem_bootmap_pages(pages) << PAGE_SHIFT;
+		base = __pa(bdp->node_bootmem_map);
+		reserve_bootmem_node(BOOT_NODE_DATA(node), base, size);
+
+		size = boot_pernodesize[node];
+		base = __pa(boot_pernode[node]);
+		reserve_bootmem_node(BOOT_NODE_DATA(node), base, size);
+	}
+}
+
+/*
+ * Initialize per-node data
+ *
+ * Finish setting up the node data for this node, then copy it to the other nodes.
+ *
+ */
+static void __init
+initialize_pernode_data(void)
+{
+	int	cpu, node;
+
+	memcpy(boot_node_data[0]->pg_data_ptrs, pg_data_ptr, sizeof(pg_data_ptr));
+	memcpy(boot_node_data[0]->node_data_ptrs, boot_node_data, sizeof(boot_node_data));
+
+	for (node=1; node < numnodes; node++) {
+		memcpy(boot_node_data[node], boot_node_data[0], sizeof(struct ia64_node_data));
+		boot_node_data[node]->node = node;
+	}
+
+	for (cpu=0; cpu < NR_CPUS; cpu++) {
+		node = node_cpuid[cpu].nid;
+		_cpu_data[cpu]->node_data = boot_node_data[node];
+		_cpu_data[cpu]->nodeid = node;
+	}
+}
+
+
+/*
+ * Called early in boot to setup the boot memory allocator, and to
+ * allocate the node-local pg_data & node-directory data structures..
+ */
+void __init
+discontig_mem_init(void)
+{
+	if (numnodes == 0) {
+		printk("node info missing!\n");
+		numnodes = 1;
+	}
+
+	min_low_pfn = -1;
+	max_low_pfn = 0;
+
+        efi_memmap_walk(filter_rsvd_memory, build_maps);
+        efi_memmap_walk(filter_rsvd_memory, find_pernode_space);
+        efi_memmap_walk(filter_rsvd_memory, discontig_free_bootmem_node);
+
+	discontig_reserve_bootmem();
+	initialize_pernode_data();
+}
+