From 2f12ab9f8409067cd3a977994659c1a0e8f3088b Mon Sep 17 00:00:00 2001 From: Adrian Calianu Date: Mon, 10 Aug 2015 17:19:12 +0200 Subject: [PATCH] Subject: [PATCH] ACPI / scan: Add support for ACPI _CLS device matching Device drivers typically use ACPI _HIDs/_CIDs listed in struct device_driver acpi_match_table to match devices. However, for generic drivers, we do not want to list _HID for all supported devices. Also, certain classes of devices do not have _CID (e.g. SATA, USB). Instead, we can leverage ACPI _CLS, which specifies PCI-defined class code (i.e. base-class, subclass and programming interface). This patch adds support for matching ACPI devices using the _CLS method. To support loadable module, current design uses _HID or _CID to match device's modalias. With the new way of matching with _CLS this would requires modification to the current ACPI modalias key to include _CLS. This patch appends PCI-defined class-code to the existing ACPI modalias as following. acpi::::..::: E.g: # cat /sys/devices/platform/AMDI0600:00/modalias acpi:AMDI0600:010601: where bb is th base-class code, ss is te sub-class code, and pp is the programming interface code Since there would not be _HID/_CID in the ACPI matching table of the driver, this patch adds a field to acpi_device_id to specify the matching _CLS. static const struct acpi_device_id ahci_acpi_match[] = { { "", 0, PCI_CLASS_STORAGE_SATA_AHCI }, {}, }; In this case, the corresponded entry in modules.alias file would be: alias acpi*:010601:* ahci_platform Signed-off-by: Suravee Suthikulpanit Upstream-Status: Pending Ported from 3.19 kernel, patch provided by AMD. Signed-off-by: Adrian Calianu --- drivers/acpi/acpica/acutils.h | 3 ++ drivers/acpi/acpica/nsxfname.c | 21 ++++++++++-- drivers/acpi/acpica/utids.c | 71 +++++++++++++++++++++++++++++++++++++++ drivers/acpi/scan.c | 20 ++++++++--- include/acpi/acnames.h | 1 + include/acpi/actypes.h | 4 ++- include/linux/mod_devicetable.h | 1 + scripts/mod/devicetable-offsets.c | 1 + scripts/mod/file2alias.c | 14 ++++++-- 9 files changed, 126 insertions(+), 10 deletions(-) diff --git a/drivers/acpi/acpica/acutils.h b/drivers/acpi/acpica/acutils.h index 2b3c5bd..218ddfd 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..3754db5 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; @@ -510,6 +524,9 @@ cleanup: if (cid_list) { ACPI_FREE(cid_list); } + if (cls) { + ACPI_FREE(cls); + } return (status); } diff --git a/drivers/acpi/acpica/utids.c b/drivers/acpi/acpica/utids.c index 27431cf..bc77122 100644 --- a/drivers/acpi/acpica/utids.c +++ b/drivers/acpi/acpica/utids.c @@ -416,3 +416,74 @@ 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; + } + +cleanup: + + /* On exit, we must delete the return object */ + + acpi_ut_remove_reference(obj_desc); + return_ACPI_STATUS(status); +} diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 03141aa..ca6297b1 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1031,11 +1031,18 @@ static const struct acpi_device_id *__acpi_match_device( if (!device || !device->status.present) return NULL; - list_for_each_entry(hwid, &device->pnp.ids, list) { - /* First, check the ACPI/PNP IDs provided by the caller. */ - for (id = ids; id->id[0]; id++) - if (!strcmp((char *) id->id, hwid->id)) - return id; + list_for_each_entry(hwid, &device->pnp.ids, list) { + for (id = ids; id->id[0] || id->cls; id++) { + if (id->id[0] && !strcmp((char *) id->id, hwid->id)) { + return id; + } else if (id->cls) { + char buf[7]; + + sprintf(buf, "%06x", id->cls); + if (!strcmp(buf, hwid->id)) + return id; + } + } /* * Next, check the special "PRP0001" ID and try to match the @@ -2057,6 +2064,9 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, pnp->unique_id = kstrdup(info->unique_id.string, GFP_KERNEL); + if (info->valid & ACPI_VALID_CLS) + acpi_add_id(pnp, info->cls.string); + kfree(info); /* diff --git a/include/acpi/acnames.h b/include/acpi/acnames.h index 273de70..b52c0dc 100644 --- a/include/acpi/acnames.h +++ b/include/acpi/acnames.h @@ -51,6 +51,7 @@ #define METHOD_NAME__BBN "_BBN" #define METHOD_NAME__CBA "_CBA" #define METHOD_NAME__CID "_CID" +#define METHOD_NAME__CLS "_CLS" #define METHOD_NAME__CRS "_CRS" #define METHOD_NAME__DDN "_DDN" #define METHOD_NAME__HID "_HID" diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h index 1c3002e..0ad0c61 100644 --- a/include/acpi/actypes.h +++ b/include/acpi/actypes.h @@ -1166,7 +1166,7 @@ struct acpi_device_info { u32 name; /* ACPI object Name */ acpi_object_type type; /* ACPI object Type */ u8 param_count; /* If a method, required parameter count */ - u8 valid; /* Indicates which optional fields are valid */ + u16 valid; /* Indicates which optional fields are valid */ u8 flags; /* Miscellaneous info */ u8 highest_dstates[4]; /* _sx_d values: 0xFF indicates not valid */ u8 lowest_dstates[5]; /* _sx_w values: 0xFF indicates not valid */ @@ -1175,6 +1175,7 @@ struct acpi_device_info { struct acpi_pnp_device_id hardware_id; /* _HID value */ struct acpi_pnp_device_id unique_id; /* _UID value */ struct acpi_pnp_device_id subsystem_id; /* _SUB value */ + struct acpi_pnp_device_id cls; /* _CLS value */ struct acpi_pnp_device_id_list compatible_id_list; /* _CID list */ }; @@ -1192,6 +1193,7 @@ struct acpi_device_info { #define ACPI_VALID_CID 0x20 #define ACPI_VALID_SXDS 0x40 #define ACPI_VALID_SXWS 0x80 +#define ACPI_VALID_CLS 0x100 /* Flags for _STA return value (current_status above) */ diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index 3bfd567..8a958d1 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -35,6 +35,7 @@ struct ieee1394_device_id { __u32 specifier_id; __u32 version; kernel_ulong_t driver_data; + __u32 cls; }; diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c index fce36d0..aac0be3 100644 --- a/scripts/mod/devicetable-offsets.c +++ b/scripts/mod/devicetable-offsets.c @@ -63,6 +63,7 @@ int main(void) DEVID(acpi_device_id); DEVID_FIELD(acpi_device_id, id); + DEVID_FIELD(acpi_device_id, cls); DEVID(pnp_device_id); DEVID_FIELD(pnp_device_id, id); diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c index 78691d5..f5599ad 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -511,12 +511,22 @@ static int do_serio_entry(const char *filename, } ADD_TO_DEVTABLE("serio", serio_device_id, do_serio_entry); -/* looks like: "acpi:ACPI0003 or acpi:PNP0C0B" or "acpi:LNXVIDEO" */ +/* looks like: "acpi:ACPI0003" or "acpi:PNP0C0B" or "acpi:LNXVIDEO" or + * "acpi:bbsspp" (bb=base-class, ss=sub-class, pp=prog-if) + * + * NOTE: * Each driver should use one of the following : _HID, _CIDs or _CLS. + */ static int do_acpi_entry(const char *filename, void *symval, char *alias) { DEF_FIELD_ADDR(symval, acpi_device_id, id); - sprintf(alias, "acpi*:%s:*", *id); + DEF_FIELD_ADDR(symval, acpi_device_id, cls); + + if (id && strlen((const char *)*id)) + sprintf(alias, "acpi*:%s:*", *id); + else if (cls) + sprintf(alias, "acpi*:%06x:*", *cls); + return 1; } ADD_TO_DEVTABLE("acpi", acpi_device_id, do_acpi_entry); -- 1.9.1