drivers/acpi/numa.c - kernel/windcharger - Git at Google

 /*
  *  acpi_numa.c - ACPI NUMA support
  *
  *  Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  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.  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  */
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/acpi.h>
 #include <linux/numa.h>
 #include <acpi/acpi_bus.h>

 #define PREFIX "ACPI: "

 #define ACPI_NUMA	0x80000000
 #define _COMPONENT	ACPI_NUMA
 ACPI_MODULE_NAME("numa");

 static nodemask_t nodes_found_map = NODE_MASK_NONE;

 /* maps to convert between proximity domain and logical node ID */
 static int pxm_to_node_map[MAX_PXM_DOMAINS]
 			= { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
 static int node_to_pxm_map[MAX_NUMNODES]
 			= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };

 unsigned char acpi_srat_revision __initdata;

 int pxm_to_node(int pxm)
 {
 	if (pxm < 0)
 		return NUMA_NO_NODE;
 	return pxm_to_node_map[pxm];
 }

 int node_to_pxm(int node)
 {
 	if (node < 0)
 		return PXM_INVAL;
 	return node_to_pxm_map[node];
 }

 void __acpi_map_pxm_to_node(int pxm, int node)
 {
 	if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
 		pxm_to_node_map[pxm] = node;
 	if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
 		node_to_pxm_map[node] = pxm;
 }

 int acpi_map_pxm_to_node(int pxm)
 {
 	int node = pxm_to_node_map[pxm];

 	if (node < 0) {
 		if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
 			return NUMA_NO_NODE;
 		node = first_unset_node(nodes_found_map);
 		__acpi_map_pxm_to_node(pxm, node);
 		node_set(node, nodes_found_map);
 	}

 	return node;
 }

 static void __init
 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
 {

 	ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");

 	if (!header)
 		return;

 	switch (header->type) {

 	case ACPI_SRAT_TYPE_CPU_AFFINITY:
 #ifdef ACPI_DEBUG_OUTPUT
 		{
 			struct acpi_srat_cpu_affinity *p =
 			    (struct acpi_srat_cpu_affinity *)header;
 			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 					  "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 					  p->apic_id, p->local_sapic_eid,
 					  p->proximity_domain_lo,
 					  (p->flags & ACPI_SRAT_CPU_ENABLED)?
 					  "enabled" : "disabled"));
 		}
 #endif				/* ACPI_DEBUG_OUTPUT */
 		break;

 	case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 #ifdef ACPI_DEBUG_OUTPUT
 		{
 			struct acpi_srat_mem_affinity *p =
 			    (struct acpi_srat_mem_affinity *)header;
 			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 					  "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
 					  (unsigned long)p->base_address,
 					  (unsigned long)p->length,
 					  p->proximity_domain,
 					  (p->flags & ACPI_SRAT_MEM_ENABLED)?
 					  "enabled" : "disabled",
 					  (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 					  " hot-pluggable" : ""));
 		}
 #endif				/* ACPI_DEBUG_OUTPUT */
 		break;

 	case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 #ifdef ACPI_DEBUG_OUTPUT
 		{
 			struct acpi_srat_x2apic_cpu_affinity *p =
 			    (struct acpi_srat_x2apic_cpu_affinity *)header;
 			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 					  "SRAT Processor (x2apicid[0x%08x]) in"
 					  " proximity domain %d %s\n",
 					  p->apic_id,
 					  p->proximity_domain,
 					  (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 					  "enabled" : "disabled"));
 		}
 #endif				/* ACPI_DEBUG_OUTPUT */
 		break;
 	default:
 		printk(KERN_WARNING PREFIX
 		       "Found unsupported SRAT entry (type = 0x%x)\n",
 		       header->type);
 		break;
 	}
 }

 /*
  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
  * up the NUMA heuristics which wants the local node to have a smaller
  * distance than the others.
  * Do some quick checks here and only use the SLIT if it passes.
  */
 static __init int slit_valid(struct acpi_table_slit *slit)
 {
 	int i, j;
 	int d = slit->locality_count;
 	for (i = 0; i < d; i++) {
 		for (j = 0; j < d; j++)  {
 			u8 val = slit->entry[d*i + j];
 			if (i == j) {
 				if (val != LOCAL_DISTANCE)
 					return 0;
 			} else if (val <= LOCAL_DISTANCE)
 				return 0;
 		}
 	}
 	return 1;
 }

 static int __init acpi_parse_slit(struct acpi_table_header *table)
 {
 	struct acpi_table_slit *slit;

 	if (!table)
 		return -EINVAL;

 	slit = (struct acpi_table_slit *)table;

 	if (!slit_valid(slit)) {
 		printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 		return -EINVAL;
 	}
 	acpi_numa_slit_init(slit);

 	return 0;
 }

 void __init __attribute__ ((weak))
 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 {
 	printk(KERN_WARNING PREFIX
 	       "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 	return;
 }


 static int __init
 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 			   const unsigned long end)
 {
 	struct acpi_srat_x2apic_cpu_affinity *processor_affinity;

 	processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 	if (!processor_affinity)
 		return -EINVAL;

 	acpi_table_print_srat_entry(header);

 	/* let architecture-dependent part to do it */
 	acpi_numa_x2apic_affinity_init(processor_affinity);

 	return 0;
 }

 static int __init
 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 			      const unsigned long end)
 {
 	struct acpi_srat_cpu_affinity *processor_affinity;

 	processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 	if (!processor_affinity)
 		return -EINVAL;

 	acpi_table_print_srat_entry(header);

 	/* let architecture-dependent part to do it */
 	acpi_numa_processor_affinity_init(processor_affinity);

 	return 0;
 }

 static int __init
 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 			   const unsigned long end)
 {
 	struct acpi_srat_mem_affinity *memory_affinity;

 	memory_affinity = (struct acpi_srat_mem_affinity *)header;
 	if (!memory_affinity)
 		return -EINVAL;

 	acpi_table_print_srat_entry(header);

 	/* let architecture-dependent part to do it */
 	acpi_numa_memory_affinity_init(memory_affinity);

 	return 0;
 }

 static int __init acpi_parse_srat(struct acpi_table_header *table)
 {
 	struct acpi_table_srat *srat;
 	if (!table)
 		return -EINVAL;

 	srat = (struct acpi_table_srat *)table;
 	acpi_srat_revision = srat->header.revision;

 	/* Real work done in acpi_table_parse_srat below. */

 	return 0;
 }

 static int __init
 acpi_table_parse_srat(enum acpi_srat_type id,
 		      acpi_table_entry_handler handler, unsigned int max_entries)
 {
 	return acpi_table_parse_entries(ACPI_SIG_SRAT,
 					    sizeof(struct acpi_table_srat), id,
 					    handler, max_entries);
 }

 int __init acpi_numa_init(void)
 {
 	int cnt = 0;

 	/*
 	 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
 	 * SRAT cpu entries could have different order with that in MADT.
 	 * So go over all cpu entries in SRAT to get apicid to node mapping.
 	 */

 	/* SRAT: Static Resource Affinity Table */
 	if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 		acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
 				     acpi_parse_x2apic_affinity, 0);
 		acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 				     acpi_parse_processor_affinity, 0);
 		cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 					    acpi_parse_memory_affinity,
 					    NR_NODE_MEMBLKS);
 	}

 	/* SLIT: System Locality Information Table */
 	acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);

 	acpi_numa_arch_fixup();

 	if (cnt <= 0)
 		return cnt ?: -ENOENT;
 	return 0;
 }

 int acpi_get_pxm(acpi_handle h)
 {
 	unsigned long long pxm;
 	acpi_status status;
 	acpi_handle handle;
 	acpi_handle phandle = h;

 	do {
 		handle = phandle;
 		status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 		if (ACPI_SUCCESS(status))
 			return pxm;
 		status = acpi_get_parent(handle, &phandle);
 	} while (ACPI_SUCCESS(status));
 	return -1;
 }

 int acpi_get_node(acpi_handle *handle)
 {
 	int pxm, node = -1;

 	pxm = acpi_get_pxm(handle);
 	if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
 		node = acpi_map_pxm_to_node(pxm);

 	return node;
 }
 EXPORT_SYMBOL(acpi_get_node);
	/*
	* acpi_numa.c - ACPI NUMA support
	*
	* Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* 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. 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	*/
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/errno.h>
	#include <linux/acpi.h>
	#include <linux/numa.h>
	#include <acpi/acpi_bus.h>

	#define PREFIX "ACPI: "

	#define ACPI_NUMA 0x80000000
	#define _COMPONENT ACPI_NUMA
	ACPI_MODULE_NAME("numa");

	static nodemask_t nodes_found_map = NODE_MASK_NONE;

	/* maps to convert between proximity domain and logical node ID */
	static int pxm_to_node_map[MAX_PXM_DOMAINS]
	= { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
	static int node_to_pxm_map[MAX_NUMNODES]
	= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };

	unsigned char acpi_srat_revision __initdata;

	int pxm_to_node(int pxm)
	{
	if (pxm < 0)
	return NUMA_NO_NODE;
	return pxm_to_node_map[pxm];
	}

	int node_to_pxm(int node)
	{
	if (node < 0)
	return PXM_INVAL;
	return node_to_pxm_map[node];
	}

	void __acpi_map_pxm_to_node(int pxm, int node)
	{
	if (pxm_to_node_map[pxm] == NUMA_NO_NODE \|\| node < pxm_to_node_map[pxm])
	pxm_to_node_map[pxm] = node;
	if (node_to_pxm_map[node] == PXM_INVAL \|\| pxm < node_to_pxm_map[node])
	node_to_pxm_map[node] = pxm;
	}

	int acpi_map_pxm_to_node(int pxm)
	{
	int node = pxm_to_node_map[pxm];

	if (node < 0) {
	if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
	return NUMA_NO_NODE;
	node = first_unset_node(nodes_found_map);
	__acpi_map_pxm_to_node(pxm, node);
	node_set(node, nodes_found_map);
	}

	return node;
	}

	static void __init
	acpi_table_print_srat_entry(struct acpi_subtable_header *header)
	{

	ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");

	if (!header)
	return;

	switch (header->type) {

	case ACPI_SRAT_TYPE_CPU_AFFINITY:
	#ifdef ACPI_DEBUG_OUTPUT
	{
	struct acpi_srat_cpu_affinity *p =
	(struct acpi_srat_cpu_affinity *)header;
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	"SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
	p->apic_id, p->local_sapic_eid,
	p->proximity_domain_lo,
	(p->flags & ACPI_SRAT_CPU_ENABLED)?
	"enabled" : "disabled"));
	}
	#endif /* ACPI_DEBUG_OUTPUT */
	break;

	case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
	#ifdef ACPI_DEBUG_OUTPUT
	{
	struct acpi_srat_mem_affinity *p =
	(struct acpi_srat_mem_affinity *)header;
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	"SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
	(unsigned long)p->base_address,
	(unsigned long)p->length,
	p->proximity_domain,
	(p->flags & ACPI_SRAT_MEM_ENABLED)?
	"enabled" : "disabled",
	(p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
	" hot-pluggable" : ""));
	}
	#endif /* ACPI_DEBUG_OUTPUT */
	break;

	case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
	#ifdef ACPI_DEBUG_OUTPUT
	{
	struct acpi_srat_x2apic_cpu_affinity *p =
	(struct acpi_srat_x2apic_cpu_affinity *)header;
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	"SRAT Processor (x2apicid[0x%08x]) in"
	" proximity domain %d %s\n",
	p->apic_id,
	p->proximity_domain,
	(p->flags & ACPI_SRAT_CPU_ENABLED) ?
	"enabled" : "disabled"));
	}
	#endif /* ACPI_DEBUG_OUTPUT */
	break;
	default:
	printk(KERN_WARNING PREFIX
	"Found unsupported SRAT entry (type = 0x%x)\n",
	header->type);
	break;
	}
	}

	/*
	* A lot of BIOS fill in 10 (= no distance) everywhere. This messes
	* up the NUMA heuristics which wants the local node to have a smaller
	* distance than the others.
	* Do some quick checks here and only use the SLIT if it passes.
	*/
	static __init int slit_valid(struct acpi_table_slit *slit)
	{
	int i, j;
	int d = slit->locality_count;
	for (i = 0; i < d; i++) {
	for (j = 0; j < d; j++) {
	u8 val = slit->entry[d*i + j];
	if (i == j) {
	if (val != LOCAL_DISTANCE)
	return 0;
	} else if (val <= LOCAL_DISTANCE)
	return 0;
	}
	}
	return 1;
	}

	static int __init acpi_parse_slit(struct acpi_table_header *table)
	{
	struct acpi_table_slit *slit;

	if (!table)
	return -EINVAL;

	slit = (struct acpi_table_slit *)table;

	if (!slit_valid(slit)) {
	printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
	return -EINVAL;
	}
	acpi_numa_slit_init(slit);

	return 0;
	}

	void __init __attribute__ ((weak))
	acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
	{
	printk(KERN_WARNING PREFIX
	"Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
	return;
	}


	static int __init
	acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
	const unsigned long end)
	{
	struct acpi_srat_x2apic_cpu_affinity *processor_affinity;

	processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
	if (!processor_affinity)
	return -EINVAL;

	acpi_table_print_srat_entry(header);

	/* let architecture-dependent part to do it */
	acpi_numa_x2apic_affinity_init(processor_affinity);

	return 0;
	}

	static int __init
	acpi_parse_processor_affinity(struct acpi_subtable_header *header,
	const unsigned long end)
	{
	struct acpi_srat_cpu_affinity *processor_affinity;

	processor_affinity = (struct acpi_srat_cpu_affinity *)header;
	if (!processor_affinity)
	return -EINVAL;

	acpi_table_print_srat_entry(header);

	/* let architecture-dependent part to do it */
	acpi_numa_processor_affinity_init(processor_affinity);

	return 0;
	}

	static int __init
	acpi_parse_memory_affinity(struct acpi_subtable_header * header,
	const unsigned long end)
	{
	struct acpi_srat_mem_affinity *memory_affinity;

	memory_affinity = (struct acpi_srat_mem_affinity *)header;
	if (!memory_affinity)
	return -EINVAL;

	acpi_table_print_srat_entry(header);

	/* let architecture-dependent part to do it */
	acpi_numa_memory_affinity_init(memory_affinity);

	return 0;
	}

	static int __init acpi_parse_srat(struct acpi_table_header *table)
	{
	struct acpi_table_srat *srat;
	if (!table)
	return -EINVAL;

	srat = (struct acpi_table_srat *)table;
	acpi_srat_revision = srat->header.revision;

	/* Real work done in acpi_table_parse_srat below. */

	return 0;
	}

	static int __init
	acpi_table_parse_srat(enum acpi_srat_type id,
	acpi_table_entry_handler handler, unsigned int max_entries)
	{
	return acpi_table_parse_entries(ACPI_SIG_SRAT,
	sizeof(struct acpi_table_srat), id,
	handler, max_entries);
	}

	int __init acpi_numa_init(void)
	{
	int cnt = 0;

	/*
	* Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
	* SRAT cpu entries could have different order with that in MADT.
	* So go over all cpu entries in SRAT to get apicid to node mapping.
	*/

	/* SRAT: Static Resource Affinity Table */
	if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
	acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
	acpi_parse_x2apic_affinity, 0);
	acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
	acpi_parse_processor_affinity, 0);
	cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
	acpi_parse_memory_affinity,
	NR_NODE_MEMBLKS);
	}

	/* SLIT: System Locality Information Table */
	acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);

	acpi_numa_arch_fixup();

	if (cnt <= 0)
	return cnt ?: -ENOENT;
	return 0;
	}

	int acpi_get_pxm(acpi_handle h)
	{
	unsigned long long pxm;
	acpi_status status;
	acpi_handle handle;
	acpi_handle phandle = h;

	do {
	handle = phandle;
	status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
	if (ACPI_SUCCESS(status))
	return pxm;
	status = acpi_get_parent(handle, &phandle);
	} while (ACPI_SUCCESS(status));
	return -1;
	}

	int acpi_get_node(acpi_handle *handle)
	{
	int pxm, node = -1;

	pxm = acpi_get_pxm(handle);
	if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
	node = acpi_map_pxm_to_node(pxm);

	return node;
	}
	EXPORT_SYMBOL(acpi_get_node);