From patchwork Fri May 6 13:00:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 12841093 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0EF64C433FE for ; Fri, 6 May 2022 12:58:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1392214AbiEFNCX (ORCPT ); Fri, 6 May 2022 09:02:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57092 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1392205AbiEFNCS (ORCPT ); Fri, 6 May 2022 09:02:18 -0400 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2EE74606C3 for ; Fri, 6 May 2022 05:58:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1651841915; x=1683377915; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=E8YsENtGlT4/ITUQqDCWM1gN7eQgBHfcT2kFkC58e7s=; b=nKjnQ1pNBcKjdFKdGT+dhJz9+I6/JferdRqaIgq9MZ/zp2CsQav7x3NS uuJ1vgNRCX5TQXjBsv4Q/26Xu/Zj3+5jBr266wc7FevSHyFnMdR9hEVK4 JDGZ3tZdrIjbwi+IqNIXHzrt1qj9p0DDCMH0eyxeUZKcW2BZm9QkDyYhl Mn0Di+4zmZUsIWQIY9NP90wwQwsvPPsYB4ngnfbbG6AajwfC4j/k6Ke5p XBa5DL+tmPklMzZkHfkpXa4Nnwit5Q49b9Zzqbkj7vtAZoyPyrs0NtMUe umcEhlnsaPBCj4srN/H7TgqCdOdhjfCJO0C/kZsIbYeB+5tHU7d1DpyW1 A==; X-IronPort-AV: E=McAfee;i="6400,9594,10338"; a="329004171" X-IronPort-AV: E=Sophos;i="5.91,203,1647327600"; d="scan'208";a="329004171" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 May 2022 05:58:34 -0700 X-IronPort-AV: E=Sophos;i="5.91,203,1647327600"; d="scan'208";a="709452102" Received: from punajuuri.fi.intel.com (HELO paasikivi.fi.intel.com) ([10.237.72.43]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 May 2022 05:58:33 -0700 Received: from punajuuri.localdomain (punajuuri.localdomain [192.168.240.130]) by paasikivi.fi.intel.com (Postfix) with ESMTP id E2E5620E91; Fri, 6 May 2022 15:58:28 +0300 (EEST) Received: from sailus by punajuuri.localdomain with local (Exim 4.94.2) (envelope-from ) id 1nmxZJ-00480l-HP; Fri, 06 May 2022 16:00:25 +0300 From: Sakari Ailus To: linux-acpi@vger.kernel.org Cc: rafael@kernel.org, andriy.shevchenko@intel.com Subject: [PATCH 08/11] ACPI: property: Parse data node string references in properties Date: Fri, 6 May 2022 16:00:22 +0300 Message-Id: <20220506130025.984026-9-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220506130025.984026-1-sakari.ailus@linux.intel.com> References: <20220506130025.984026-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Add support for parsing property references using strings, besides reference objects that were previously supported. This allows also referencing data nodes which was not possible with reference objects. Signed-off-by: Sakari Ailus --- drivers/acpi/property.c | 103 ++++++++++++++++++++++++++++++++++------ 1 file changed, 89 insertions(+), 14 deletions(-) diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c index a8e8a214a524f..9325a9b2c0543 100644 --- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -677,7 +677,8 @@ static int acpi_get_ref_args(struct fwnode_reference_args *args, struct fwnode_handle *ref_fwnode, const union acpi_object **element, - const union acpi_object *end, size_t num_args) + const union acpi_object *end, size_t num_args, + bool subnode_string) { u32 nargs = 0, i; @@ -685,14 +686,17 @@ acpi_get_ref_args(struct fwnode_reference_args *args, * Find the referred data extension node under the * referred device node. */ - for (; *element < end && (*element)->type == ACPI_TYPE_STRING; - (*element)++) { - const char *child_name = (*element)->string.pointer; - - ref_fwnode = acpi_fwnode_get_named_child_node(ref_fwnode, - child_name); - if (!ref_fwnode) - return -EINVAL; + if (subnode_string) { + for (; *element < end && (*element)->type == ACPI_TYPE_STRING; + (*element)++) { + const char *child_name = (*element)->string.pointer; + + ref_fwnode = + acpi_fwnode_get_named_child_node(ref_fwnode, + child_name); + if (!ref_fwnode) + return -EINVAL; + } } /* @@ -703,7 +707,8 @@ acpi_get_ref_args(struct fwnode_reference_args *args, for (i = 0; (*element) + i < end && i < num_args; i++) { acpi_object_type type = (*element)[i].type; - if (type == ACPI_TYPE_LOCAL_REFERENCE) + if (type == ACPI_TYPE_LOCAL_REFERENCE || + (!subnode_string && type == ACPI_TYPE_STRING)) break; if (type == ACPI_TYPE_INTEGER) @@ -727,6 +732,43 @@ acpi_get_ref_args(struct fwnode_reference_args *args, return 0; } +static struct fwnode_handle * +acpi_parse_string_ref(const struct fwnode_handle *fwnode, const char *refstring) +{ + acpi_handle scope, handle; + struct acpi_data_node *dn; + struct acpi_device *device; + acpi_status status; + + if (is_acpi_device_node(fwnode)) { + scope = to_acpi_device_node(fwnode)->handle; + } else if (is_acpi_data_node(fwnode)) { + scope = to_acpi_data_node(fwnode)->handle; + } else { + pr_err("ACPI: bad node type\n"); + return ERR_PTR(-EINVAL); + } + + status = acpi_get_handle(scope, refstring, &handle); + if (ACPI_FAILURE(status)) { + acpi_handle_debug(scope, "can't get handle for %s", refstring); + return ERR_PTR(-EINVAL); + } + + device = acpi_fetch_acpi_dev(handle); + if (device) + return acpi_fwnode_handle(device); + + status = acpi_get_data_full(handle, acpi_nondev_subnode_tag, + (void **)&dn, NULL); + if (ACPI_FAILURE(status) || !dn) { + acpi_handle_debug(handle, "can't find subnode"); + return ERR_PTR(-EINVAL); + } + + return &dn->fwnode; +} + /** * __acpi_node_get_property_reference - returns handle to the referenced object * @fwnode: Firmware node to get the property from @@ -769,6 +811,7 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode, const union acpi_object *element, *end; const union acpi_object *obj; const struct acpi_device_data *data; + struct fwnode_handle *ref_fwnode; struct acpi_device *device; int ret, idx = 0; @@ -792,16 +835,29 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode, args->fwnode = acpi_fwnode_handle(device); args->nargs = 0; + return 0; + case ACPI_TYPE_STRING: + if (index) + return -ENOENT; + + ref_fwnode = acpi_parse_string_ref(fwnode, obj->string.pointer); + if (IS_ERR(ref_fwnode)) + return PTR_ERR(ref_fwnode); + + args->fwnode = ref_fwnode; + args->nargs = 0; + return 0; case ACPI_TYPE_PACKAGE: /* * If it is not a single reference, then it is a package of - * references followed by number of ints as follows: + * references, followed by number of ints as follows: * * Package () { REF, INT, REF, INT, INT } * - * The index argument is then used to determine which reference - * the caller wants (along with the arguments). + * Here, REF may be either a local reference or a string. The + * index argument is then used to determine which reference the + * caller wants (along with the arguments). */ break; default: @@ -825,7 +881,26 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode, ret = acpi_get_ref_args(idx == index ? args : NULL, acpi_fwnode_handle(device), - &element, end, num_args); + &element, end, num_args, true); + if (ret < 0) + return ret; + + if (idx == index) + return 0; + + break; + case ACPI_TYPE_STRING: + ref_fwnode = + acpi_parse_string_ref(fwnode, + element->string.pointer); + if (IS_ERR(ref_fwnode)) + return PTR_ERR(ref_fwnode); + + element++; + + ret = acpi_get_ref_args(idx == index ? args : NULL, + ref_fwnode, &element, end, + num_args, false); if (ret < 0) return ret;