Yes, this is a good question that we should think about. Bob
> -----Original Message----- > From: Zheng, Lv > Sent: Thursday, April 16, 2015 6:46 PM > To: Suravee Suthikulpanit; r...@rjwysocki.net; > mika.westerb...@linux.intel.com; Moore, Robert; hanjun....@linaro.org > Cc: l...@kernel.org; hdego...@redhat.com; t...@kernel.org; > mj...@srcf.ucam.org; gre...@linuxfoundation.org; al.st...@linaro.org; > graeme.greg...@linaro.org; leo.du...@amd.com; linux-...@vger.kernel.org; > linux-a...@vger.kernel.org; linux-kernel@vger.kernel.org; linaro- > a...@lists.linaro.org > Subject: RE: [V8 PATCH 1/3] ACPICA: Add ACPI _CLS processing > > Before back porting this to ACPICA, let me ask one simple question. > According to the spec, the _CLS is optional and PCI specific. > So why should we implement it in ACPICA core not OSPM specific modules? > If this need to be implemented in ACPICA, then what about the following > device identification objects? > _DDN, _HRV, _MLS, _PLD, _STR, _SUN > > Thanks and best regards > -Lv > > > From: Suravee Suthikulpanit [mailto:suravee.suthikulpa...@amd.com] > > Sent: Tuesday, March 31, 2015 5:56 AM > > > > ACPI Device configuration often contain _CLS object to suppy > > PCI-defined class code for the device. This patch introduces logic to > > process the _CLS object. > > > > Acked-by: Mika Westerberg <mika.westerb...@linux.intel.com> > > Reviewed-by: Hanjun Guo <hanjun....@linaro.org> > > Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com> > > --- > > drivers/acpi/acpica/acutils.h | 3 ++ > > drivers/acpi/acpica/nsxfname.c | 21 ++++++++++-- > > drivers/acpi/acpica/utids.c | 73 > ++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 95 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/acpi/acpica/acutils.h > > b/drivers/acpi/acpica/acutils.h index c2f03e8..2aef850 100644 > > --- a/drivers/acpi/acpica/acutils.h > > +++ b/drivers/acpi/acpica/acutils.h > > @@ -430,6 +430,9 @@ acpi_status > > acpi_ut_execute_CID(struct acpi_namespace_node *device_node, > > struct acpi_pnp_device_id_list ** return_cid_list); > > > > +acpi_status > > +acpi_ut_execute_CLS(struct acpi_namespace_node *device_node, > > + struct acpi_pnp_device_id **return_id); > > /* > > * utlock - reader/writer locks > > */ > > diff --git a/drivers/acpi/acpica/nsxfname.c > > b/drivers/acpi/acpica/nsxfname.c index d66c326..590ef06 100644 > > --- a/drivers/acpi/acpica/nsxfname.c > > +++ b/drivers/acpi/acpica/nsxfname.c > > @@ -276,11 +276,12 @@ acpi_get_object_info(acpi_handle handle, > > struct acpi_pnp_device_id *hid = NULL; > > struct acpi_pnp_device_id *uid = NULL; > > struct acpi_pnp_device_id *sub = NULL; > > + struct acpi_pnp_device_id *cls = NULL; > > char *next_id_string; > > acpi_object_type type; > > acpi_name name; > > u8 param_count = 0; > > - u8 valid = 0; > > + u16 valid = 0; > > u32 info_size; > > u32 i; > > acpi_status status; > > @@ -320,7 +321,7 @@ acpi_get_object_info(acpi_handle handle, > > if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) { > > /* > > * Get extra info for ACPI Device/Processor objects only: > > - * Run the Device _HID, _UID, _SUB, and _CID methods. > > + * Run the Device _HID, _UID, _SUB, _CID and _CLS methods. > > * > > * Note: none of these methods are required, so they may or > may > > * not be present for this device. The Info->Valid bitfield is > used > > @@ -351,6 +352,14 @@ acpi_get_object_info(acpi_handle handle, > > valid |= ACPI_VALID_SUB; > > } > > > > + /* Execute the Device._CLS method */ > > + > > + status = acpi_ut_execute_CLS(node, &cls); > > + if (ACPI_SUCCESS(status)) { > > + info_size += cls->length; > > + valid |= ACPI_VALID_CLS; > > + } > > + > > /* Execute the Device._CID method */ > > > > status = acpi_ut_execute_CID(node, &cid_list); @@ -468,6 > +477,11 @@ > > acpi_get_object_info(acpi_handle handle, > > sub, next_id_string); > > } > > > > + if (cls) { > > + next_id_string = acpi_ns_copy_device_id(&info->cls, > > + cls, next_id_string); > > + } > > + > > if (cid_list) { > > info->compatible_id_list.count = cid_list->count; > > info->compatible_id_list.list_size = cid_list->list_size; @@ - > 507,6 > > +521,9 @@ cleanup: > > if (sub) { > > ACPI_FREE(sub); > > } > > + if (cls) { > > + ACPI_FREE(cls); > > + } > > if (cid_list) { > > ACPI_FREE(cid_list); > > } > > diff --git a/drivers/acpi/acpica/utids.c b/drivers/acpi/acpica/utids.c > > index 27431cf..9745065 100644 > > --- a/drivers/acpi/acpica/utids.c > > +++ b/drivers/acpi/acpica/utids.c > > @@ -416,3 +416,76 @@ cleanup: > > acpi_ut_remove_reference(obj_desc); > > return_ACPI_STATUS(status); > > } > > + > > +/******************************************************************** > > +*********** > > + * > > + * FUNCTION: acpi_ut_execute_CLS > > + * > > + * PARAMETERS: device_node - Node for the device > > + * return_id - Where the string UID is returned > > + * > > + * RETURN: Status > > + * > > + * DESCRIPTION: Executes the _CLS control method that returns PCI- > defined > > + * class code of the device. The ACPI spec define _CLS as > a > > + * package with three integers. The returned string has > format: > > + * > > + * "bbsspp" > > + * where: > > + * bb = Base-class code > > + * ss = Sub-class code > > + * pp = Programming Interface code > > + * > > + > > +********************************************************************* > > +*********/ > > + > > +acpi_status > > +acpi_ut_execute_CLS(struct acpi_namespace_node *device_node, > > + struct acpi_pnp_device_id **return_id) { > > + struct acpi_pnp_device_id *cls; > > + union acpi_operand_object *obj_desc; > > + union acpi_operand_object **cls_objects; > > + acpi_status status; > > + > > + ACPI_FUNCTION_TRACE(ut_execute_CLS); > > + status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CLS, > > + ACPI_BTYPE_PACKAGE, &obj_desc); > > + if (ACPI_FAILURE(status)) > > + return_ACPI_STATUS(status); > > + > > + cls_objects = obj_desc->package.elements; > > + > > + if (obj_desc->common.type == ACPI_TYPE_PACKAGE && > > + obj_desc->package.count == 3 && > > + cls_objects[0]->common.type == ACPI_TYPE_INTEGER && > > + cls_objects[1]->common.type == ACPI_TYPE_INTEGER && > > + cls_objects[2]->common.type == ACPI_TYPE_INTEGER) { > > + > > + /* Allocate a buffer for the CLS */ > > + cls = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) + > > + (acpi_size) 7); > > + if (!cls) { > > + status = AE_NO_MEMORY; > > + goto cleanup; > > + } > > + > > + cls->string = > > + ACPI_ADD_PTR(char, cls, sizeof(struct > acpi_pnp_device_id)); > > + > > + sprintf(cls->string, "%02x%02x%02x", > > + (u8)ACPI_TO_INTEGER(cls_objects[0]->integer.value), > > + (u8)ACPI_TO_INTEGER(cls_objects[1]->integer.value), > > + (u8)ACPI_TO_INTEGER(cls_objects[2]->integer.value)); > > + cls->length = 7; > > + *return_id = cls; > > + } else { > > + status = AE_AML_OPERAND_TYPE; > > + } > > + > > +cleanup: > > + > > + /* On exit, we must delete the return object */ > > + > > + acpi_ut_remove_reference(obj_desc); > > + return_ACPI_STATUS(status); > > +} > > -- > > 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
