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SubjectRe: [PATCH v2 2/3] ACPI: Behave uniquely based on processor declaration definition type
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On Fri, 2008-10-31 at 06:13 +0800, Myron Stowe wrote:
> 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'. Note that for "Processor" declarations, even if a
> '_UID' child object exists, it has no bearing with respect to mapping
> Local SAPICs (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@hp.com>
> Cc: Alexey Starikovskiy <aystarik@gmail.com>
> Cc: Zhao Yakui <yakui.zhao@intel.com>
> ---
>
> drivers/acpi/processor_core.c | 75 +++++++++++++++++++++++------------------
> 1 files changed, 42 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
> index 0c670dd..35d33e8 100644
> --- a/drivers/acpi/processor_core.c
> +++ b/drivers/acpi/processor_core.c
> @@ -410,7 +410,7 @@ static int acpi_processor_remove_fs(struct acpi_device *device)
> /* 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 +429,35 @@ static int map_lapic_id(struct acpi_subtable_header *entry,
> }
>
> 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 LSAPIC with Device type processor (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 +478,7 @@ 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 +486,7 @@ 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 +509,7 @@ static int map_mat_entry(acpi_handle handle, u32 acpi_id)
> 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 +518,14 @@ 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 +541,16 @@ static int get_cpu_id(acpi_handle handle, u32 acpi_id)
> 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 +571,11 @@ static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
> 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) {
> + if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
> + /*
> + * Declared with "Device" statement; match _UID.
> + * Note that we don't handle string _UIDs yet.
Looks very good.
Can you add the check whether the device.flags.unique_id exists before
evaluating the _UID object?
If not exist, it indicates that the processor definition is incorrect.

Thanks.
> + */
> unsigned long long value;
> status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
> NULL, &value);
> @@ -571,13 +583,10 @@ static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
> printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
> return -ENODEV;
> }
> + device_declaration = 1;
> pr->acpi_id = value;
> } else {
> - /*
> - * Evalute the processor object. Note that it is common on SMP to
> - * have the first (boot) processor with a valid PBLK address while
> - * all others have a NULL address.
> - */
> + /* Declared with "Processor" statement; match ProcessorID */
> status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
> if (ACPI_FAILURE(status)) {
> printk(KERN_ERR PREFIX "Evaluating processor object\n");
> @@ -590,7 +599,7 @@ static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
> */
> 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 +671,7 @@ static int __cpuinit acpi_processor_start(struct acpi_device *device)
>
> 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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