>
>
> 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;
> }
If I read this right, lsapic->uid and acpi_id (Processor Device _UID)
no longer need to equal (lsapic->id << 8) | lsapic->eid), as now 'tmp'
will be the value returned.
Is this correct?
I don't know of a problem with this, just making sure I understand this.
Glad to see this change, as I had concerns of map_lsapic_id() first
trying to match against lsapic->processor_id, and possibly ignoring
lsapic->uid.
Thanks,
John
>
> -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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