Release 4.11 drivers/acpi/processor_core.c

/*
 * Copyright (C) 2005 Intel Corporation
 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
 *
 *      Alex Chiang <achiang@hp.com>
 *      - Unified x86/ia64 implementations
 *
 * I/O APIC hotplug support
 *      Yinghai Lu <yinghai@kernel.org>
 *      Jiang Liu <jiang.liu@intel.com>
 */
#include <linux/export.h>
#include <linux/acpi.h>
#include <acpi/processor.h>


#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_core");



static struct acpi_table_madt *get_madt_table(void)
{
	static struct acpi_table_madt *madt;
	static int read_madt;

	if (!read_madt) {
		if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
					(struct acpi_table_header **)&madt)))
			madt = NULL;
		read_madt++;
	}

	return madt;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
58
100.00%
1
100.00%
Total
58
100.00%
1
100.00%



static int map_lapic_id(struct acpi_subtable_header *entry,
		 u32 acpi_id, phys_cpuid_t *apic_id)
{
	struct acpi_madt_local_apic *lapic =
		container_of(entry, struct acpi_madt_local_apic, header);

	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
		return -ENODEV;

	if (lapic->processor_id != acpi_id)
		return -EINVAL;

	*apic_id = lapic->id;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Chiang
57
81.43%
2
40.00%
Fabian Frederick
7
10.00%
1
20.00%
Hanjun Guo
5
7.14%
1
20.00%
Catalin Marinas
1
1.43%
1
20.00%
Total
70
100.00%
5
100.00%



static int map_x2apic_id(struct acpi_subtable_header *entry,
		int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
{
	struct acpi_madt_local_x2apic *apic =
		container_of(entry, struct acpi_madt_local_x2apic, header);

	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
		return -ENODEV;

	if (device_declaration && (apic->uid == acpi_id)) {
		*apic_id = apic->local_apic_id;
		return 0;
	}

	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Chiang
66
83.54%
2
40.00%
Fabian Frederick
7
8.86%
1
20.00%
Hanjun Guo
5
6.33%
1
20.00%
Catalin Marinas
1
1.27%
1
20.00%
Total
79
100.00%
5
100.00%



static int map_lsapic_id(struct acpi_subtable_header *entry,
		int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
{
	struct acpi_madt_local_sapic *lsapic =
		container_of(entry, struct acpi_madt_local_sapic, header);

	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
		return -ENODEV;

	if (device_declaration) {
		if ((entry->length < 16) || (lsapic->uid != acpi_id))
			return -EINVAL;
	} else if (lsapic->processor_id != acpi_id)
		return -EINVAL;

	*apic_id = (lsapic->id << 8) | lsapic->eid;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Chiang
95
86.36%
2
40.00%
Hanjun Guo
7
6.36%
1
20.00%
Fabian Frederick
7
6.36%
1
20.00%
Catalin Marinas
1
0.91%
1
20.00%
Total
110
100.00%
5
100.00%

/*
 * Retrieve the ARM CPU physical identifier (MPIDR)
 */


static int map_gicc_mpidr(struct acpi_subtable_header *entry,
		int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr)
{
	struct acpi_madt_generic_interrupt *gicc =
	    container_of(entry, struct acpi_madt_generic_interrupt, header);

	if (!(gicc->flags & ACPI_MADT_ENABLED))
		return -ENODEV;

	/* device_declaration means Device object in DSDT, in the
         * GIC interrupt model, logical processors are required to
         * have a Processor Device object in the DSDT, so we should
         * check device_declaration here
         */
	if (device_declaration && (gicc->uid == acpi_id)) {
		*mpidr = gicc->arm_mpidr;
		return 0;
	}

	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hanjun Guo
80
100.00%
1
100.00%
Total
80
100.00%
1
100.00%



static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
				   int type, u32 acpi_id)
{
	unsigned long madt_end, entry;
	phys_cpuid_t phys_id = PHYS_CPUID_INVALID;	/* CPU hardware ID */

	if (!madt)
		return phys_id;

	entry = (unsigned long)madt;
	madt_end = entry + madt->header.length;

	/* Parse all entries looking for a match. */

	entry += sizeof(struct acpi_table_madt);
	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
		struct acpi_subtable_header *header =
			(struct acpi_subtable_header *)entry;
		if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
			if (!map_lapic_id(header, acpi_id, &phys_id))
				break;
		} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
			if (!map_x2apic_id(header, type, acpi_id, &phys_id))
				break;
		} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
			if (!map_lsapic_id(header, type, acpi_id, &phys_id))
				break;
		} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
			if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))
				break;
		}
		entry += header->length;
	}
	return phys_id;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Chiang
159
77.94%
2
28.57%
Hanjun Guo
37
18.14%
3
42.86%
David Daney
5
2.45%
1
14.29%
Catalin Marinas
3
1.47%
1
14.29%
Total
204
100.00%
7
100.00%



phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
{
	struct acpi_table_madt *madt = NULL;
	phys_cpuid_t rv;

	acpi_get_table(ACPI_SIG_MADT, 0,
		       (struct acpi_table_header **)&madt);
	if (!madt)
		return PHYS_CPUID_INVALID;

	rv = map_madt_entry(madt, 1, acpi_id);

	acpi_put_table((struct acpi_table_header *)madt);

	return rv;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Daney
60
89.55%
1
50.00%
Lv Zheng
7
10.45%
1
50.00%
Total
67
100.00%
2
100.00%



static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	struct acpi_subtable_header *header;
	phys_cpuid_t phys_id = PHYS_CPUID_INVALID;

	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
		goto exit;

	if (!buffer.length || !buffer.pointer)
		goto exit;

	obj = buffer.pointer;
	if (obj->type != ACPI_TYPE_BUFFER ||
	    obj->buffer.length < sizeof(struct acpi_subtable_header)) {
		goto exit;
	}

	header = (struct acpi_subtable_header *)obj->buffer.pointer;
	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
		map_lapic_id(header, acpi_id, &phys_id);
	else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
		map_lsapic_id(header, type, acpi_id, &phys_id);
	else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
		map_x2apic_id(header, type, acpi_id, &phys_id);
	else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
		map_gicc_mpidr(header, type, acpi_id, &phys_id);

exit:
	kfree(buffer.pointer);
	return phys_id;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Chiang
163
76.89%
1
20.00%
Hanjun Guo
46
21.70%
3
60.00%
Catalin Marinas
3
1.42%
1
20.00%
Total
212
100.00%
5
100.00%



phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
{
	phys_cpuid_t phys_id;

	phys_id = map_mat_entry(handle, type, acpi_id);
	if (invalid_phys_cpuid(phys_id))
		phys_id = map_madt_entry(get_madt_table(), type, acpi_id);

	return phys_id;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Chiang
33
66.00%
1
14.29%
Hanjun Guo
8
16.00%
2
28.57%
Jiang Liu
3
6.00%
1
14.29%
David Daney
3
6.00%
1
14.29%
Catalin Marinas
2
4.00%
1
14.29%
Dou Liyang
1
2.00%
1
14.29%
Total
50
100.00%
7
100.00%



int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
{
#ifdef CONFIG_SMP
	int i;
#endif

	if (invalid_phys_cpuid(phys_id)) {
		/*
                 * On UP processor, there is no _MAT or MADT table.
                 * So above phys_id is always set to PHYS_CPUID_INVALID.
                 *
                 * BIOS may define multiple CPU handles even for UP processor.
                 * For example,
                 *
                 * Scope (_PR)
                 * {
                 *     Processor (CPU0, 0x00, 0x00000410, 0x06) {}
                 *     Processor (CPU1, 0x01, 0x00000410, 0x06) {}
                 *     Processor (CPU2, 0x02, 0x00000410, 0x06) {}
                 *     Processor (CPU3, 0x03, 0x00000410, 0x06) {}
                 * }
                 *
                 * Ignores phys_id and always returns 0 for the processor
                 * handle with acpi id 0 if nr_cpu_ids is 1.
                 * This should be the case if SMP tables are not found.
                 * Return -EINVAL for other CPU's handle.
                 */
		if (nr_cpu_ids <= 1 && acpi_id == 0)
			return acpi_id;
		else
			return -EINVAL;
	}

#ifdef CONFIG_SMP
	for_each_possible_cpu(i) {
		if (cpu_physical_id(i) == phys_id)
			return i;
	}
#else
	/* In UP kernel, only processor 0 is valid */
	if (phys_id == 0)
		return phys_id;
#endif
	return -ENODEV;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lin Ming
27
31.40%
2
22.22%
Alexander Chiang
26
30.23%
1
11.11%
Jiang Liu
16
18.60%
1
11.11%
Hanjun Guo
11
12.79%
3
33.33%
Thomas Renninger
4
4.65%
1
11.11%
Catalin Marinas
2
2.33%
1
11.11%
Total
86
100.00%
9
100.00%



int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
	phys_cpuid_t phys_id;

	phys_id = acpi_get_phys_id(handle, type, acpi_id);

	return acpi_map_cpuid(phys_id, acpi_id);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiang Liu
31
86.11%
1
33.33%
Hanjun Guo
4
11.11%
1
33.33%
Catalin Marinas
1
2.78%
1
33.33%
Total
36
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(acpi_get_cpuid);

#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC


static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
			 u64 *phys_addr, int *ioapic_id)
{
	struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;

	if (ioapic->global_irq_base != gsi_base)
		return 0;

	*phys_addr = ioapic->address;
	*ioapic_id = ioapic->id;
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
62
100.00%
1
100.00%
Total
62
100.00%
1
100.00%



static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
{
	struct acpi_subtable_header *hdr;
	unsigned long madt_end, entry;
	struct acpi_table_madt *madt;
	int apic_id = -1;

	madt = get_madt_table();
	if (!madt)
		return apic_id;

	entry = (unsigned long)madt;
	madt_end = entry + madt->header.length;

	/* Parse all entries looking for a match. */
	entry += sizeof(struct acpi_table_madt);
	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
		hdr = (struct acpi_subtable_header *)entry;
		if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
		    get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
			break;
		else
			entry += hdr->length;
	}

	return apic_id;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
129
100.00%
1
100.00%
Total
129
100.00%
1
100.00%



static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
				  u64 *phys_addr)
{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_subtable_header *header;
	union acpi_object *obj;
	int apic_id = -1;

	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
		goto exit;

	if (!buffer.length || !buffer.pointer)
		goto exit;

	obj = buffer.pointer;
	if (obj->type != ACPI_TYPE_BUFFER ||
	    obj->buffer.length < sizeof(struct acpi_subtable_header))
		goto exit;

	header = (struct acpi_subtable_header *)obj->buffer.pointer;
	if (header->type == ACPI_MADT_TYPE_IO_APIC)
		get_ioapic_id(header, gsi_base, phys_addr, &apic_id);

exit:
	kfree(buffer.pointer);
	return apic_id;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
151
100.00%
1
100.00%
Total
151
100.00%
1
100.00%

/**
 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
 * @handle:     ACPI object for IOAPIC device
 * @gsi_base:   GSI base to match with
 * @phys_addr:  Pointer to store physical address of matching IOAPIC record
 *
 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
 * for an ACPI IOAPIC record matching @gsi_base.
 * Return IOAPIC id and store physical address in @phys_addr if found a match,
 * otherwise return <0.
 */


int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
{
	int apic_id;

	apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
	if (apic_id == -1)
		apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);

	return apic_id;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
48
100.00%
1
100.00%
Total
48
100.00%
1
100.00%

#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Chiang
618
41.93%
7
28.00%
Yinghai Lu
456
30.94%
1
4.00%
Hanjun Guo
204
13.84%
6
24.00%
David Daney
68
4.61%
1
4.00%
Jiang Liu
50
3.39%
1
4.00%
Lin Ming
27
1.83%
2
8.00%
Fabian Frederick
21
1.42%
1
4.00%
Catalin Marinas
14
0.95%
1
4.00%
Lv Zheng
8
0.54%
2
8.00%
Thomas Renninger
4
0.27%
1
4.00%
Paul Gortmaker
3
0.20%
1
4.00%
Dou Liyang
1
0.07%
1
4.00%
Total
1474
100.00%
25
100.00%
Directory: drivers/acpi

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.