From patchwork Fri Nov 8 00:18:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 11233931 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BF42D15AB for ; Fri, 8 Nov 2019 00:18:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 87C522084C for ; Fri, 8 Nov 2019 00:18:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="P/ucsawO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728572AbfKHASQ (ORCPT ); Thu, 7 Nov 2019 19:18:16 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:42884 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725928AbfKHASM (ORCPT ); Thu, 7 Nov 2019 19:18:12 -0500 Received: by mail-pf1-f195.google.com with SMTP id s5so3526105pfh.9; Thu, 07 Nov 2019 16:18:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ayUB+Zje9XOtWri2ZwkcqJ23e3BRsxjTr/FbRYD45nI=; b=P/ucsawOyj4iGInyifA2hv7QVl0/QAqgCzVr5FrXFfq0KKI54sdD3sqrUytcCkocwW D52lmH7MUN4kuCzhl/+ax3xZuhX6enoIIX+gwPN50DURhVxqYRilBkGATsmcUDijksMv qNWdxqy0nETUC2MQQAtlHhsY/A8RZcSl8ZN8CIXB4UhTcVFXQai8dPoo2zKtjskDHxGG dV0Fy3HJcBJq4k5BhcS6AdY91UQPB0M8tOP87Q1LqL9Ut0JnMViI81L6MipO+MKgD6e5 cmF9/SZWdPM86dUU762kIa+sZXqMxCY+AFWtsCtrhcNrSIohwO8CLn9GzXivkw4MaObp h/gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ayUB+Zje9XOtWri2ZwkcqJ23e3BRsxjTr/FbRYD45nI=; b=aoudvfpNzqEkooVuSE/ph+vcugP+RrMRnDhgxRrpDuFgouoJ+aj4ePt50gkxRNQDir +aeIamO4w3W3hsnRNnwPjkG2dKNABaHmKKmqUEMm8g0By+UfAq7Lfe/hTu/7Dst4PfIK txwZRZ54DL/GLVij0i/74Bs4gpb0eJJCdSN2kBVf6WOmwd1Ke85D4R71wquwlZWuyTha d43npMkBpsyYjolYZ4OtGNT9nljsmhjpDAO9Vc+zKNF7yNDkQoo5hJVOT+K3iuAmYBjN 1mZkujCE/7wWH0X9gWSkDshF9sGdhHOrDROPrlfogo2ta0YLeqoV+v8J3Je5ptF36je0 XSSQ== X-Gm-Message-State: APjAAAXq40oTxuZTFD8yGT7lVqYOCn9dJ66w1FP9SLqdJPN4mLRHi9JQ yJMlDFfU0G/7DnpYg3/Fw4A= X-Google-Smtp-Source: APXvYqwu6VQrGGJUTJXh9OYfuGqb5Ahu8tXNV4vuTGbVZu9rbN3sra2CZkTyBPvYXfE2xvUN4xdcRg== X-Received: by 2002:a62:e818:: with SMTP id c24mr7922214pfi.125.1573172291079; Thu, 07 Nov 2019 16:18:11 -0800 (PST) Received: from dtor-ws.mtv.corp.google.com ([2620:15c:202:201:3adc:b08c:7acc:b325]) by smtp.gmail.com with ESMTPSA id m68sm3688764pfb.122.2019.11.07.16.18.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Nov 2019 16:18:10 -0800 (PST) From: Dmitry Torokhov To: "Rafael J. Wysocki" , Heikki Krogerus Cc: Andy Shevchenko , Mika Westerberg , Linus Walleij , Ard Biesheuvel , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org Subject: [PATCH v7 3/6] software node: implement reference properties Date: Thu, 7 Nov 2019 16:18:00 -0800 Message-Id: <20191108001803.191541-4-dmitry.torokhov@gmail.com> X-Mailer: git-send-email 2.24.0.rc1.363.gb1bccd3e3d-goog In-Reply-To: <20191108001803.191541-1-dmitry.torokhov@gmail.com> References: <20191108001803.191541-1-dmitry.torokhov@gmail.com> MIME-Version: 1.0 Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org It is possible to store references to software nodes in the same fashion as other static properties, so that users do not need to define separate structures: static const struct software_node gpio_bank_b_node = { .name = "B", }; static const struct property_entry simone_key_enter_props[] = { PROPERTY_ENTRY_U32("linux,code", KEY_ENTER), PROPERTY_ENTRY_STRING("label", "enter"), PROPERTY_ENTRY_REF("gpios", &gpio_bank_b_node, 123, GPIO_ACTIVE_LOW), { } }; Signed-off-by: Dmitry Torokhov --- drivers/base/swnode.c | 49 ++++++++++++++++++++++++++++------ include/linux/property.h | 57 +++++++++++++++++++++++++++++----------- 2 files changed, 82 insertions(+), 24 deletions(-) diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c index ce7f202b2455e..809146f57aa45 100644 --- a/drivers/base/swnode.c +++ b/drivers/base/swnode.c @@ -246,6 +246,13 @@ static int property_entry_copy_data(struct property_entry *dst, if (!src->is_inline && !src->length) return -ENODATA; + /* + * Reference properties are never stored inline as + * they are too big. + */ + if (src->type == DEV_PROP_REF && src->is_inline) + return -EINVAL; + if (src->length <= sizeof(dst->value)) { dst_ptr = &dst->value; dst->is_inline = true; @@ -473,21 +480,47 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode, { struct swnode *swnode = to_swnode(fwnode); const struct software_node_reference *ref; + const struct software_node_ref_args *ref_array; + const struct software_node_ref_args *ref_args; const struct property_entry *prop; struct fwnode_handle *refnode; int i; - if (!swnode || !swnode->node->references) + if (!swnode) return -ENOENT; - for (ref = swnode->node->references; ref->name; ref++) - if (!strcmp(ref->name, propname)) - break; + prop = property_entry_get(swnode->node->properties, propname); + if (prop) { + if (prop->type != DEV_PROP_REF) + return -EINVAL; - if (!ref->name || index > (ref->nrefs - 1)) - return -ENOENT; + /* + * We expect that references are never stored inline, even + * single ones, as they are too big. + */ + if (prop->is_inline) + return -EINVAL; + + if (index * sizeof(*ref_args) >= prop->length) + return -ENOENT; + + ref_array = prop->pointer; + ref_args = &ref_array[index]; + } else { + if (!swnode->node->references) + return -ENOENT; + + for (ref = swnode->node->references; ref->name; ref++) + if (!strcmp(ref->name, propname)) + break; + + if (!ref->name || index > (ref->nrefs - 1)) + return -ENOENT; + + ref_args = &ref->refs[index]; + } - refnode = software_node_fwnode(ref->refs[index].node); + refnode = software_node_fwnode(ref_args->node); if (!refnode) return -ENOENT; @@ -506,7 +539,7 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode, args->nargs = nargs; for (i = 0; i < nargs; i++) - args->args[i] = ref->refs[index].args[i]; + args->args[i] = ref_args->args[i]; return 0; } diff --git a/include/linux/property.h b/include/linux/property.h index dad0ad11b55e2..68655c094b395 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -22,6 +22,7 @@ enum dev_prop_type { DEV_PROP_U32, DEV_PROP_U64, DEV_PROP_STRING, + DEV_PROP_REF, }; enum dev_dma_attr { @@ -223,6 +224,20 @@ static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode, return fwnode_property_read_u64_array(fwnode, propname, NULL, 0); } +struct software_node; + +/** + * struct software_node_ref_args - Reference property with additional arguments + * @node: Reference to a software node + * @nargs: Number of elements in @args array + * @args: Integer arguments + */ +struct software_node_ref_args { + const struct software_node *node; + unsigned int nargs; + u64 args[NR_FWNODE_REFERENCE_ARGS]; +}; + /** * struct property_entry - "Built-in" device property representation. * @name: Name of the property. @@ -260,14 +275,20 @@ struct property_entry { #define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_) \ sizeof(((struct property_entry *)NULL)->value._elem_) -#define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\ +#define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_, \ + _val_, _len_) \ (struct property_entry) { \ .name = _name_, \ - .length = (_len_) * __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \ + .length = (_len_) * (_elsize_), \ .type = DEV_PROP_##_Type_, \ { .pointer = _val_ }, \ } +#define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\ + __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \ + __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \ + _Type_, _val_, _len_) + #define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \ __PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_) #define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \ @@ -278,6 +299,10 @@ struct property_entry { __PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_) #define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \ __PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_) +#define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \ + __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \ + sizeof(struct software_node_ref_args), \ + REF, _val_, _len_) #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \ PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_)) @@ -289,6 +314,8 @@ struct property_entry { PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_)) #define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \ PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_)) +#define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \ + PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_)) #define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \ (struct property_entry) { \ @@ -316,6 +343,18 @@ struct property_entry { .is_inline = true, \ } +#define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \ +(struct property_entry) { \ + .name = _name_, \ + .length = sizeof(struct software_node_ref_args), \ + .type = DEV_PROP_REF, \ + { .pointer = &(const struct software_node_ref_args) { \ + .node = _ref_, \ + .nargs = ARRAY_SIZE(((u64[]){ 0, ##__VA_ARGS__ })) - 1, \ + .args = { __VA_ARGS__ }, \ + } }, \ +} + struct property_entry * property_entries_dup(const struct property_entry *properties); @@ -379,20 +418,6 @@ int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode, /* -------------------------------------------------------------------------- */ /* Software fwnode support - when HW description is incomplete or missing */ -struct software_node; - -/** - * struct software_node_ref_args - Reference with additional arguments - * @node: Reference to a software node - * @nargs: Number of elements in @args array - * @args: Integer arguments - */ -struct software_node_ref_args { - const struct software_node *node; - unsigned int nargs; - u64 args[NR_FWNODE_REFERENCE_ARGS]; -}; - /** * struct software_node_reference - Named software node reference property * @name: Name of the property