arch/x86/mm/srat_32.c - linux - Git at Google

 /*
  * Some of the code in this file has been gleaned from the 64 bit
  * discontigmem support code base.
  *
  * 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.
  *
  * Send feedback to Pat Gaughen <gone@us.ibm.com>
  */
 #include <linux/mm.h>
 #include <linux/bootmem.h>
 #include <linux/memblock.h>
 #include <linux/mmzone.h>
 #include <linux/acpi.h>
 #include <linux/nodemask.h>
 #include <asm/srat.h>
 #include <asm/topology.h>
 #include <asm/smp.h>
 #include <asm/e820.h>

 /*
  * proximity macros and definitions
  */
 #define NODE_ARRAY_INDEX(x)	((x) / 8)	/* 8 bits/char */
 #define NODE_ARRAY_OFFSET(x)	((x) % 8)	/* 8 bits/char */
 #define BMAP_SET(bmap, bit)	((bmap)[NODE_ARRAY_INDEX(bit)] |= 1 << NODE_ARRAY_OFFSET(bit))
 #define BMAP_TEST(bmap, bit)	((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
 /* bitmap length; _PXM is at most 255 */
 #define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8)
 static u8 __initdata pxm_bitmap[PXM_BITMAP_LEN];	/* bitmap of proximity domains */

 #define MAX_CHUNKS_PER_NODE	3
 #define MAXCHUNKS		(MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
 struct node_memory_chunk_s {
 	unsigned long	start_pfn;
 	unsigned long	end_pfn;
 	u8	pxm;		// proximity domain of node
 	u8	nid;		// which cnode contains this chunk?
 	u8	bank;		// which mem bank on this node
 };
 static struct node_memory_chunk_s __initdata node_memory_chunk[MAXCHUNKS];

 static int __initdata num_memory_chunks; /* total number of memory chunks */
 static u8 __initdata apicid_to_pxm[MAX_APICID];

 int acpi_numa __initdata;

 static __init void bad_srat(void)
 {
         printk(KERN_ERR "SRAT: SRAT not used.\n");
         acpi_numa = -1;
 	num_memory_chunks = 0;
 }

 static __init inline int srat_disabled(void)
 {
 	return numa_off || acpi_numa < 0;
 }

 /* Identify CPU proximity domains */
 void __init
 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *cpu_affinity)
 {
 	if (srat_disabled())
 		return;
 	if (cpu_affinity->header.length !=
 	     sizeof(struct acpi_srat_cpu_affinity)) {
 		bad_srat();
 		return;
 	}

 	if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
 		return;		/* empty entry */

 	/* mark this node as "seen" in node bitmap */
 	BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);

 	/* don't need to check apic_id here, because it is always 8 bits */
 	apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;

 	printk(KERN_DEBUG "CPU %02x in proximity domain %02x\n",
 		cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
 }

 /*
  * Identify memory proximity domains and hot-remove capabilities.
  * Fill node memory chunk list structure.
  */
 void __init
 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *memory_affinity)
 {
 	unsigned long long paddr, size;
 	unsigned long start_pfn, end_pfn;
 	u8 pxm;
 	struct node_memory_chunk_s *p, *q, *pend;

 	if (srat_disabled())
 		return;
 	if (memory_affinity->header.length !=
 	     sizeof(struct acpi_srat_mem_affinity)) {
 		bad_srat();
 		return;
 	}

 	if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 		return;		/* empty entry */

 	pxm = memory_affinity->proximity_domain & 0xff;

 	/* mark this node as "seen" in node bitmap */
 	BMAP_SET(pxm_bitmap, pxm);

 	/* calculate info for memory chunk structure */
 	paddr = memory_affinity->base_address;
 	size = memory_affinity->length;

 	start_pfn = paddr >> PAGE_SHIFT;
 	end_pfn = (paddr + size) >> PAGE_SHIFT;


 	if (num_memory_chunks >= MAXCHUNKS) {
 		printk(KERN_WARNING "Too many mem chunks in SRAT."
 			" Ignoring %lld MBytes at %llx\n",
 			size/(1024*1024), paddr);
 		return;
 	}

 	/* Insertion sort based on base address */
 	pend = &node_memory_chunk[num_memory_chunks];
 	for (p = &node_memory_chunk[0]; p < pend; p++) {
 		if (start_pfn < p->start_pfn)
 			break;
 	}
 	if (p < pend) {
 		for (q = pend; q >= p; q--)
 			*(q + 1) = *q;
 	}
 	p->start_pfn = start_pfn;
 	p->end_pfn = end_pfn;
 	p->pxm = pxm;

 	num_memory_chunks++;

 	printk(KERN_DEBUG "Memory range %08lx to %08lx"
 			  " in proximity domain %02x %s\n",
 		start_pfn, end_pfn,
 		pxm,
 		((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
 		 "enabled and removable" : "enabled" ) );
 }

 /* Callback for SLIT parsing */
 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 {
 }

 void acpi_numa_arch_fixup(void)
 {
 }
 /*
  * The SRAT table always lists ascending addresses, so can always
  * assume that the first "start" address that you see is the real
  * start of the node, and that the current "end" address is after
  * the previous one.
  */
 static __init int node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
 {
 	/*
 	 * Only add present memory as told by the e820.
 	 * There is no guarantee from the SRAT that the memory it
 	 * enumerates is present at boot time because it represents
 	 * *possible* memory hotplug areas the same as normal RAM.
 	 */
 	if (memory_chunk->start_pfn >= max_pfn) {
 		printk(KERN_INFO "Ignoring SRAT pfns: %08lx - %08lx\n",
 			memory_chunk->start_pfn, memory_chunk->end_pfn);
 		return -1;
 	}
 	if (memory_chunk->nid != nid)
 		return -1;

 	if (!node_has_online_mem(nid))
 		node_start_pfn[nid] = memory_chunk->start_pfn;

 	if (node_start_pfn[nid] > memory_chunk->start_pfn)
 		node_start_pfn[nid] = memory_chunk->start_pfn;

 	if (node_end_pfn[nid] < memory_chunk->end_pfn)
 		node_end_pfn[nid] = memory_chunk->end_pfn;

 	return 0;
 }

 int __init get_memcfg_from_srat(void)
 {
 	int i, j, nid;


 	if (srat_disabled())
 		goto out_fail;

 	if (num_memory_chunks == 0) {
 		printk(KERN_DEBUG
 			 "could not find any ACPI SRAT memory areas.\n");
 		goto out_fail;
 	}

 	/* Calculate total number of nodes in system from PXM bitmap and create
 	 * a set of sequential node IDs starting at zero.  (ACPI doesn't seem
 	 * to specify the range of _PXM values.)
 	 */
 	/*
 	 * MCD - we no longer HAVE to number nodes sequentially.  PXM domain
 	 * numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
 	 * 32, so we will continue numbering them in this manner until MAX_NUMNODES
 	 * approaches MAX_PXM_DOMAINS for i386.
 	 */
 	nodes_clear(node_online_map);
 	for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 		if (BMAP_TEST(pxm_bitmap, i)) {
 			int nid = acpi_map_pxm_to_node(i);
 			node_set_online(nid);
 		}
 	}
 	BUG_ON(num_online_nodes() == 0);

 	/* set cnode id in memory chunk structure */
 	for (i = 0; i < num_memory_chunks; i++)
 		node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);

 	printk(KERN_DEBUG "pxm bitmap: ");
 	for (i = 0; i < sizeof(pxm_bitmap); i++) {
 		printk(KERN_CONT "%02x ", pxm_bitmap[i]);
 	}
 	printk(KERN_CONT "\n");
 	printk(KERN_DEBUG "Number of logical nodes in system = %d\n",
 			 num_online_nodes());
 	printk(KERN_DEBUG "Number of memory chunks in system = %d\n",
 			 num_memory_chunks);

 	for (i = 0; i < MAX_APICID; i++)
 		apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);

 	for (j = 0; j < num_memory_chunks; j++){
 		struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
 		printk(KERN_DEBUG
 			"chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
 		       j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
 		if (node_read_chunk(chunk->nid, chunk))
 			continue;

 		memblock_x86_register_active_regions(chunk->nid, chunk->start_pfn,
 					     min(chunk->end_pfn, max_pfn));
 	}
 	/* for out of order entries in SRAT */
 	sort_node_map();

 	for_each_online_node(nid) {
 		unsigned long start = node_start_pfn[nid];
 		unsigned long end = min(node_end_pfn[nid], max_pfn);

 		memory_present(nid, start, end);
 		node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
 	}
 	return 1;
 out_fail:
 	printk(KERN_DEBUG "failed to get NUMA memory information from SRAT"
 			" table\n");
 	return 0;
 }
	/*
	* Some of the code in this file has been gleaned from the 64 bit
	* discontigmem support code base.
	*
	* 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.
	*
	* Send feedback to Pat Gaughen <gone@us.ibm.com>
	*/
	#include <linux/mm.h>
	#include <linux/bootmem.h>
	#include <linux/memblock.h>
	#include <linux/mmzone.h>
	#include <linux/acpi.h>
	#include <linux/nodemask.h>
	#include <asm/srat.h>
	#include <asm/topology.h>
	#include <asm/smp.h>
	#include <asm/e820.h>

	/*
	* proximity macros and definitions
	*/
	#define NODE_ARRAY_INDEX(x) ((x) / 8) /* 8 bits/char */
	#define NODE_ARRAY_OFFSET(x) ((x) % 8) /* 8 bits/char */
	#define BMAP_SET(bmap, bit) ((bmap)[NODE_ARRAY_INDEX(bit)] \|= 1 << NODE_ARRAY_OFFSET(bit))
	#define BMAP_TEST(bmap, bit) ((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
	/* bitmap length; _PXM is at most 255 */
	#define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8)
	static u8 __initdata pxm_bitmap[PXM_BITMAP_LEN]; /* bitmap of proximity domains */

	#define MAX_CHUNKS_PER_NODE 3
	#define MAXCHUNKS (MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
	struct node_memory_chunk_s {
	unsigned long start_pfn;
	unsigned long end_pfn;
	u8 pxm; // proximity domain of node
	u8 nid; // which cnode contains this chunk?
	u8 bank; // which mem bank on this node
	};
	static struct node_memory_chunk_s __initdata node_memory_chunk[MAXCHUNKS];

	static int __initdata num_memory_chunks; /* total number of memory chunks */
	static u8 __initdata apicid_to_pxm[MAX_APICID];

	int acpi_numa __initdata;

	static __init void bad_srat(void)
	{
	printk(KERN_ERR "SRAT: SRAT not used.\n");
	acpi_numa = -1;
	num_memory_chunks = 0;
	}

	static __init inline int srat_disabled(void)
	{
	return numa_off \|\| acpi_numa < 0;
	}

	/* Identify CPU proximity domains */
	void __init
	acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *cpu_affinity)
	{
	if (srat_disabled())
	return;
	if (cpu_affinity->header.length !=
	sizeof(struct acpi_srat_cpu_affinity)) {
	bad_srat();
	return;
	}

	if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
	return; /* empty entry */

	/* mark this node as "seen" in node bitmap */
	BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);

	/* don't need to check apic_id here, because it is always 8 bits */
	apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;

	printk(KERN_DEBUG "CPU %02x in proximity domain %02x\n",
	cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
	}

	/*
	* Identify memory proximity domains and hot-remove capabilities.
	* Fill node memory chunk list structure.
	*/
	void __init
	acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *memory_affinity)
	{
	unsigned long long paddr, size;
	unsigned long start_pfn, end_pfn;
	u8 pxm;
	struct node_memory_chunk_s p, q, *pend;

	if (srat_disabled())
	return;
	if (memory_affinity->header.length !=
	sizeof(struct acpi_srat_mem_affinity)) {
	bad_srat();
	return;
	}

	if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
	return; /* empty entry */

	pxm = memory_affinity->proximity_domain & 0xff;

	/* mark this node as "seen" in node bitmap */
	BMAP_SET(pxm_bitmap, pxm);

	/* calculate info for memory chunk structure */
	paddr = memory_affinity->base_address;
	size = memory_affinity->length;

	start_pfn = paddr >> PAGE_SHIFT;
	end_pfn = (paddr + size) >> PAGE_SHIFT;


	if (num_memory_chunks >= MAXCHUNKS) {
	printk(KERN_WARNING "Too many mem chunks in SRAT."
	" Ignoring %lld MBytes at %llx\n",
	size/(1024*1024), paddr);
	return;
	}

	/* Insertion sort based on base address */
	pend = &node_memory_chunk[num_memory_chunks];
	for (p = &node_memory_chunk[0]; p < pend; p++) {
	if (start_pfn < p->start_pfn)
	break;
	}
	if (p < pend) {
	for (q = pend; q >= p; q--)
	(q + 1) = q;
	}
	p->start_pfn = start_pfn;
	p->end_pfn = end_pfn;
	p->pxm = pxm;

	num_memory_chunks++;

	printk(KERN_DEBUG "Memory range %08lx to %08lx"
	" in proximity domain %02x %s\n",
	start_pfn, end_pfn,
	pxm,
	((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
	"enabled and removable" : "enabled" ) );
	}

	/* Callback for SLIT parsing */
	void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
	{
	}

	void acpi_numa_arch_fixup(void)
	{
	}
	/*
	* The SRAT table always lists ascending addresses, so can always
	* assume that the first "start" address that you see is the real
	* start of the node, and that the current "end" address is after
	* the previous one.
	*/
	static __init int node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
	{
	/*
	* Only add present memory as told by the e820.
	* There is no guarantee from the SRAT that the memory it
	* enumerates is present at boot time because it represents
	* possible memory hotplug areas the same as normal RAM.
	*/
	if (memory_chunk->start_pfn >= max_pfn) {
	printk(KERN_INFO "Ignoring SRAT pfns: %08lx - %08lx\n",
	memory_chunk->start_pfn, memory_chunk->end_pfn);
	return -1;
	}
	if (memory_chunk->nid != nid)
	return -1;

	if (!node_has_online_mem(nid))
	node_start_pfn[nid] = memory_chunk->start_pfn;

	if (node_start_pfn[nid] > memory_chunk->start_pfn)
	node_start_pfn[nid] = memory_chunk->start_pfn;

	if (node_end_pfn[nid] < memory_chunk->end_pfn)
	node_end_pfn[nid] = memory_chunk->end_pfn;

	return 0;
	}

	int __init get_memcfg_from_srat(void)
	{
	int i, j, nid;


	if (srat_disabled())
	goto out_fail;

	if (num_memory_chunks == 0) {
	printk(KERN_DEBUG
	"could not find any ACPI SRAT memory areas.\n");
	goto out_fail;
	}

	/* Calculate total number of nodes in system from PXM bitmap and create
	* a set of sequential node IDs starting at zero. (ACPI doesn't seem
	* to specify the range of _PXM values.)
	*/
	/*
	* MCD - we no longer HAVE to number nodes sequentially. PXM domain
	* numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
	* 32, so we will continue numbering them in this manner until MAX_NUMNODES
	* approaches MAX_PXM_DOMAINS for i386.
	*/
	nodes_clear(node_online_map);
	for (i = 0; i < MAX_PXM_DOMAINS; i++) {
	if (BMAP_TEST(pxm_bitmap, i)) {
	int nid = acpi_map_pxm_to_node(i);
	node_set_online(nid);
	}
	}
	BUG_ON(num_online_nodes() == 0);

	/* set cnode id in memory chunk structure */
	for (i = 0; i < num_memory_chunks; i++)
	node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);

	printk(KERN_DEBUG "pxm bitmap: ");
	for (i = 0; i < sizeof(pxm_bitmap); i++) {
	printk(KERN_CONT "%02x ", pxm_bitmap[i]);
	}
	printk(KERN_CONT "\n");
	printk(KERN_DEBUG "Number of logical nodes in system = %d\n",
	num_online_nodes());
	printk(KERN_DEBUG "Number of memory chunks in system = %d\n",
	num_memory_chunks);

	for (i = 0; i < MAX_APICID; i++)
	apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);

	for (j = 0; j < num_memory_chunks; j++){
	struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
	printk(KERN_DEBUG
	"chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
	j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
	if (node_read_chunk(chunk->nid, chunk))
	continue;

	memblock_x86_register_active_regions(chunk->nid, chunk->start_pfn,
	min(chunk->end_pfn, max_pfn));
	}
	/* for out of order entries in SRAT */
	sort_node_map();

	for_each_online_node(nid) {
	unsigned long start = node_start_pfn[nid];
	unsigned long end = min(node_end_pfn[nid], max_pfn);

	memory_present(nid, start, end);
	node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
	}
	return 1;
	out_fail:
	printk(KERN_DEBUG "failed to get NUMA memory information from SRAT"
	" table\n");
	return 0;
	}