Associating a Local SAPIC with a processor object is dependent upon the
processor object's definition type. CPUs declared as "Processor" should use
the Local SAPIC's 'processor_id', and CPUs declared as "Device" should use the
'uid' (see section 5.2.11.13 - Local SAPIC Structure; "Advanced Configuration
and Power Interface Specification", Revision 3.0b).
This patch changes the lsapic mapping logic to rely on the distinction of
how the processor object was declared - the mapping can't just try both types
of matches irregardless of declaration type and rely on one failing as is
currently being done.
Signed-off-by: Myron Stowe <myron.stowe@xxxxxx>
CC: Alexey Starikovskiy <aystarik@xxxxxxxxx>
---
drivers/acpi/processor_core.c | 64 +++++++++++++++++++++++-------------------
1 file changed, 36 insertions(+), 28 deletions(-)
Index: linux-2.6/drivers/acpi/processor_core.c
===================================================================
--- linux-2.6.orig/drivers/acpi/processor_core.c 2008-10-21 13:12:13.000000000 -0600
+++ linux-2.6/drivers/acpi/processor_core.c 2008-10-22 12:12:11.000000000 -0600
@@ -410,7 +410,7 @@ static int acpi_processor_remove_fs(stru
/* Use the acpiid in MADT to map cpus in case of SMP */
#ifndef CONFIG_SMP
-static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
+static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
#else
static struct acpi_table_madt *madt;
@@ -429,27 +429,33 @@ static int map_lapic_id(struct acpi_subt
}
static int map_lsapic_id(struct acpi_subtable_header *entry,
- u32 acpi_id, int *apic_id)
+ int device_declaration, u32 acpi_id, int *apic_id)
{
struct acpi_madt_local_sapic *lsapic =
(struct acpi_madt_local_sapic *)entry;
+ u32 tmp = (lsapic->id << 8) | lsapic->eid;
+
/* Only check enabled APICs*/
- if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
- /* First check against id */
- if (lsapic->processor_id == acpi_id) {
- *apic_id = (lsapic->id << 8) | lsapic->eid;
- return 1;
- /* Check against optional uid */
- } else if (entry->length >= 16 &&
- lsapic->uid == acpi_id) {
- *apic_id = lsapic->uid;
- return 1;
- }
- }
+ if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
+ return 0;
+
+ /* Device statement declaration type */
+ if (device_declaration) {
+ if (entry->length < 16)
+ printk(KERN_ERR PREFIX "Invalid Local SAPIC structure corresponding to Device statement processor with SAPIC ID %#x\n", tmp);
+ else if (lsapic->uid == acpi_id)
+ goto found;
+ /* Processor statement declaration type */
+ } else if (lsapic->processor_id == acpi_id)
+ goto found;
+
return 0;
+found:
+ *apic_id = tmp;
+ return 1;
}
-static int map_madt_entry(u32 acpi_id)
+static int map_madt_entry(int type, u32 acpi_id)
{
unsigned long madt_end, entry;
int apic_id = -1;
@@ -470,7 +476,7 @@ static int map_madt_entry(u32 acpi_id)
if (map_lapic_id(header, acpi_id, &apic_id))
break;
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
- if (map_lsapic_id(header, acpi_id, &apic_id))
+ if (map_lsapic_id(header, type, acpi_id, &apic_id))
break;
}
entry += header->length;
@@ -478,7 +484,7 @@ static int map_madt_entry(u32 acpi_id)
return apic_id;
}
-static int map_mat_entry(acpi_handle handle, u32 acpi_id)
+static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
@@ -501,7 +507,7 @@ static int map_mat_entry(acpi_handle han
if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
map_lapic_id(header, acpi_id, &apic_id);
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
- map_lsapic_id(header, acpi_id, &apic_id);
+ map_lsapic_id(header, type, acpi_id, &apic_id);
}
exit:
@@ -510,14 +516,14 @@ exit:
return apic_id;
}
-static int get_cpu_id(acpi_handle handle, u32 acpi_id)
+static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
{
int i;
int apic_id = -1;
- apic_id = map_mat_entry(handle, acpi_id);
+ apic_id = map_mat_entry(handle, type, acpi_id);
if (apic_id == -1)
- apic_id = map_madt_entry(acpi_id);
+ apic_id = map_madt_entry(type, acpi_id);
if (apic_id == -1)
return apic_id;
@@ -533,15 +539,16 @@ static int get_cpu_id(acpi_handle handle
Driver Interface
-------------------------------------------------------------------------- */
-static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
+static int acpi_processor_get_info(struct acpi_device *device)
{
acpi_status status = 0;
union acpi_object object = { 0 };
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
- int cpu_index;
+ struct acpi_processor *pr;
+ int cpu_index, device_declaration = 0;
static int cpu0_initialized;
-
+ pr = acpi_driver_data(device);
if (!pr)
return -EINVAL;
@@ -562,8 +569,8 @@ static int acpi_processor_get_info(struc
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No bus mastering arbitration control\n"));
- /* Check if it is a Device with HID and UID */
- if (has_uid) {
+ /* Check if it is a Device statement declaration with HID and UID */
+ if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
unsigned long value;
status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
NULL, &value);
@@ -571,6 +578,7 @@ static int acpi_processor_get_info(struc
printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
return -ENODEV;
}
+ device_declaration = 1;
pr->acpi_id = value;
} else {
/*
@@ -590,7 +598,7 @@ static int acpi_processor_get_info(struc
*/
pr->acpi_id = object.processor.proc_id;
}
- cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
+ cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
/* Handle UP system running SMP kernel, with no LAPIC in MADT */
if (!cpu0_initialized && (cpu_index == -1) &&
@@ -662,7 +670,7 @@ static int __cpuinit acpi_processor_star
pr = acpi_driver_data(device);
- result = acpi_processor_get_info(pr, device->flags.unique_id);
+ result = acpi_processor_get_info(device);
if (result) {
/* Processor is physically not present */
return 0;
--
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