For ioapic hotplug, we need to pass apic id for ioapic registration.
We could check _MAT and MADT to get io apic id, just like cpu hotplug
path to get apic id.
Signed-off-by: Yinghai Lu <ying...@kernel.org>
---
drivers/acpi/apic_id.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++--
include/linux/acpi.h | 9 +++++
2 files changed, 104 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/apic_id.c b/drivers/acpi/apic_id.c
index bf4e6de..724444e 100644
--- a/drivers/acpi/apic_id.c
+++ b/drivers/acpi/apic_id.c
@@ -1,5 +1,7 @@
/*
* acpi_get_cpuid
+ * acpi_get_ioapic_id for ioapic hotplug support
+ *
*/
#include <linux/export.h>
#include <linux/slab.h>
@@ -59,11 +61,11 @@ static int map_lsapic_id(struct acpi_subtable_header *entry,
return 1;
}
+static struct acpi_table_madt *madt;
+static int read_madt;
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;
if (!read_madt) {
@@ -199,3 +201,94 @@ 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_PCI_IOAPIC
+static int map_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 map_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
+{
+ unsigned long madt_end, entry;
+ int apic_id = -1;
+
+ if (!read_madt) {
+ if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
+ (struct acpi_table_header **)&madt)))
+ madt = NULL;
+ read_madt++;
+ }
+
+ 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) {
+ struct acpi_subtable_header *header =
+ (struct acpi_subtable_header *)entry;
+ if (header->type == ACPI_MADT_TYPE_IO_APIC) {
+ if (map_ioapic_id(header, gsi_base, phys_addr,
+ &apic_id))
+ break;
+ }
+ entry += header->length;
+ }
+ return apic_id;
+}
+
+static int map_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
+ u64 *phys_addr)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ struct acpi_subtable_header *header;
+ 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)
+ map_ioapic_id(header, gsi_base, phys_addr, &apic_id);
+
+exit:
+ kfree(buffer.pointer);
+ return apic_id;
+}
+
+int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
+{
+ int apic_id = -1;
+
+ apic_id = map_mat_ioapic_entry(handle, gsi_base, phys_addr);
+ if (apic_id == -1)
+ apic_id = map_madt_ioapic_entry(gsi_base, phys_addr);
+
+ return apic_id;
+}
+
+#endif /* CONFIG_PCI_IOAPIC */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 2f73b81..ee8058e 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -137,6 +137,15 @@ int acpi_unmap_lsapic(int cpu);
int acpi_get_apicid(acpi_handle, int type, u32 acpi_id);
int acpi_map_cpuid(int apic_id, u32 acpi_id);
int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
+#ifdef CONFIG_PCI_IOAPIC
+int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
+#else
+static inline int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base,
+ u64 *phys_addr)
+{
+ return -1;
+}
+#endif
int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base);
--
1.8.4
--
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