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ACPI: Add interfaces to parse IOAPIC ID for IOAPIC hotplug 

We need to parse APIC ID for IOAPIC registration for IOAPIC hotplug.
ACPI _MAT method and MADT table are used to figure out IOAPIC ID, just
like parsing CPU APIC ID for CPU hotplug.

[ tglx: Fixed docbook comment ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Len Brown <lenb@kernel.org>
Link: http://lkml.kernel.org/r/1414387308-27148-8-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Yinghai Lu 2015-02-05 13:44:48 +08:00 committed by Rafael J. Wysocki
parent b4b55cda58
commit ecf5636dcd
2 changed files with 118 additions and 9 deletions
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123
drivers/acpi/processor_core.c
View File

@ -4,6 +4,10 @@
*
* 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>
@ -12,6 +16,21 @@
#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;
}
static int map_lapic_id(struct acpi_subtable_header *entry,
u32 acpi_id, int *apic_id)
{
@ -67,17 +86,10 @@ static int map_lsapic_id(struct acpi_subtable_header *entry,
static int map_madt_entry(int type, u32 acpi_id)
{
unsigned long madt_end, entry;
static struct acpi_table_madt *madt;
static int read_madt;
int phys_id = -1; /* CPU hardware ID */
struct acpi_table_madt *madt;
if (!read_madt) {
if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
(struct acpi_table_header **)&madt)))
madt = NULL;
read_madt++;
}
madt = get_madt_table();
if (!madt)
return phys_id;
@ -203,3 +215,96 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
return acpi_map_cpuid(phys_id, acpi_id);
}
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;
}
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;
}
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;
}
/**
* 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;
}
#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */

4
include/linux/acpi.h
View File

@ -152,6 +152,10 @@ int acpi_map_cpu(acpi_handle handle, int physid, int *pcpu);
int acpi_unmap_cpu(int cpu);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
#endif
int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base);
int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base);