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Date: Mon, 3 Nov 2014 02:58:24 -0800
From: tip-bot for Yinghai Lu <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: rjw@...ysocki.net, yinghai@...nel.org, konrad.wilk@...cle.com,
lenb@...nel.org, tglx@...utronix.de, joro@...tes.org,
rdunlap@...radead.org, gregkh@...uxfoundation.org,
benh@...nel.crashing.org, bhelgaas@...gle.com, hpa@...or.com,
bp@...en8.de, tony.luck@...el.com, jiang.liu@...ux.intel.com,
mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip:x86/apic] ACPI:
Add interfaces to parse IOAPIC ID for IOAPIC hotplug
Commit-ID: 717ed6192d16cecf06b7412bf07c207ed92a9f52
Gitweb: http://git.kernel.org/tip/717ed6192d16cecf06b7412bf07c207ed92a9f52
Author: Yinghai Lu <yinghai@...nel.org>
AuthorDate: Mon, 27 Oct 2014 13:21:37 +0800
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 3 Nov 2014 11:56:07 +0100
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@...nel.org>
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Len Brown <lenb@...nel.org>
Link: http://lkml.kernel.org/r/1414387308-27148-8-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
drivers/acpi/processor_core.c | 123 ++++++++++++++++++++++++++++++++++++++----
include/linux/acpi.h | 4 ++
2 files changed, 118 insertions(+), 9 deletions(-)
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 342942f..f124cbb 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -4,6 +4,10 @@
*
* Alex Chiang <achiang@...com>
* - Unified x86/ia64 implementations
+ *
+ * I/O APIC hotplug support
+ * Yinghai Lu <yinghai@...nel.org>
+ * Jiang Liu <jiang.liu@...el.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 apic_id = -1;
+ 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 apic_id;
@@ -203,3 +215,96 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
return acpi_map_cpuid(apic_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 */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 407a12f..77cecd0 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -146,6 +146,10 @@ int acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu);
int acpi_unmap_lsapic(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);
void acpi_irq_stats_init(void);
--
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