From patchwork Fri Jan 26 00:55:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joe Komlodi X-Patchwork-Id: 13531916 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E298BC47258 for ; Fri, 26 Jan 2024 00:56:42 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rTAVa-0003h9-7H; Thu, 25 Jan 2024 19:55:50 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <3EQOzZQcKChg8CA9C164CC492.0CAE2AI-12J29BCB4BI.CF4@flex--komlodi.bounces.google.com>) id 1rTAVY-0003gu-OC for qemu-devel@nongnu.org; Thu, 25 Jan 2024 19:55:48 -0500 Received: from mail-pf1-x449.google.com ([2607:f8b0:4864:20::449]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from <3EQOzZQcKChg8CA9C164CC492.0CAE2AI-12J29BCB4BI.CF4@flex--komlodi.bounces.google.com>) id 1rTAVX-0004ow-3C for qemu-devel@nongnu.org; Thu, 25 Jan 2024 19:55:48 -0500 Received: by mail-pf1-x449.google.com with SMTP id d2e1a72fcca58-6ddc2aefbe4so142749b3a.0 for ; Thu, 25 Jan 2024 16:55:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1706230545; x=1706835345; darn=nongnu.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=m19Pu1vkmJDMyBn5hNIU5j0Y+S3lgC3I8zwbtySHjio=; b=erhDR9gOPTgIfKPR2ui3SqnzgedM0LZG+4IOItLXuiZolwACr1A2I/w21pxLsGFpW0 CY6Pmg+A+dV3scEO2aS0RXCnsXCmBV0fgQ5AgvDlaEYDG0zj0H8m0ZPMWn9auHUi/NIU iXtW6EK61iqUY5ZcO5JyaZbp+uFqFG0AGuqTeq07xoNzZ7WFSiQpnsN1VbbTnvOqUb+/ 3qn0/jnWBTZNdUJFKWZN7njkxfGXRjAdd8yT/OWkT3r4jBEAMSTRMq/5hIHo26qptYFj MONc7vKA2fQap56I73jgLkc487P+tembmjbgLnRdVAYv97rM5iWYAsKhRclQLYu02kiC 6fyw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706230545; x=1706835345; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=m19Pu1vkmJDMyBn5hNIU5j0Y+S3lgC3I8zwbtySHjio=; b=RkqRpZMIC76Czkr6/SP0N0yOy6LqIotZ/9YLnU/x2QYtQHdRfmBuviv2NLgtNBsn/N y/ZA9hKjrDQBmGkdRSHFN0CQU1h20yarDJLC09jS67cRvuI8XT28FVLkkHmAOHJfat04 U82PxRlkcqWj9XhhdNvzf/7NecIlp03nXzDU0lQ7UC59/LpaYG4T10JAwmcgLUL/d5l8 l1uwXC5AxebnLHYPudDVxUJhJzit9WdrBPYcdoo2KgVjNT35KW91hs0FqdSKAEjhjipV AZVYmMbKo29f/0Gg7aV5opaQpiyXq5CEU0wHVDK/kzqIPerhA+v7Fz12hB+cSIzIFBE2 6XPw== X-Gm-Message-State: AOJu0YyyqaVFOcHgzUloQ/s7+5I/yXALI3em7aZojFULe2GBRoedUcW7 9yJqCoE820FsDzuW6J0C9LrJ9DKs7nbJ/YjZynGO+ZHt6tB4shYBDKV5jj0IspcN096TGbY0ytj Okc1Rezc5oHL8hNtJyWS3zYoYggXe8XNUJamLxCqSnvpf2GVNhbxUwA7ap+BW/EhsqURK0H8KjD lBeRzAQ5+8G43cuF1vLxivR2K+1a2MqP5pnoo1 X-Google-Smtp-Source: AGHT+IHceoXjQVw+EsO1WWjw+SpKgK+xfMt68zYWoE0jve3G6T4RPO9uZHF2CsBRbqGSNClbnZVFhQQ2YIbb X-Received: from komlodi.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:35ee]) (user=komlodi job=sendgmr) by 2002:a05:6a00:3697:b0:6dd:8444:d141 with SMTP id dw23-20020a056a00369700b006dd8444d141mr75871pfb.4.1706230545064; Thu, 25 Jan 2024 16:55:45 -0800 (PST) Date: Fri, 26 Jan 2024 00:55:39 +0000 In-Reply-To: <20240126005541.1839038-1-komlodi@google.com> Mime-Version: 1.0 References: <20240126005541.1839038-1-komlodi@google.com> X-Mailer: git-send-email 2.43.0.429.g432eaa2c6b-goog Message-ID: <20240126005541.1839038-2-komlodi@google.com> Subject: [PATCH v2 1/3] hw/i2c: core: Add reset From: Joe Komlodi To: qemu-devel@nongnu.org Cc: venture@google.com, komlodi@google.com, minyard@acm.org Received-SPF: pass client-ip=2607:f8b0:4864:20::449; envelope-from=3EQOzZQcKChg8CA9C164CC492.0CAE2AI-12J29BCB4BI.CF4@flex--komlodi.bounces.google.com; helo=mail-pf1-x449.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org It's possible for a reset to come in the middle of a transaction, which causes the bus to be in an old state when a new transaction comes in. Signed-off-by: Joe Komlodi --- hw/i2c/core.c | 30 +++++++++++++++++++++++++----- include/hw/i2c/i2c.h | 6 +++++- 2 files changed, 30 insertions(+), 6 deletions(-) diff --git a/hw/i2c/core.c b/hw/i2c/core.c index 4cf30b2c86..def4f134d0 100644 --- a/hw/i2c/core.c +++ b/hw/i2c/core.c @@ -23,11 +23,31 @@ static Property i2c_props[] = { DEFINE_PROP_END_OF_LIST(), }; -static const TypeInfo i2c_bus_info = { - .name = TYPE_I2C_BUS, - .parent = TYPE_BUS, - .instance_size = sizeof(I2CBus), -}; +static void i2c_bus_enter_reset(Object *obj, ResetType type) +{ + I2CBus *bus = I2C_BUS(obj); + I2CNode *node, *next; + + bus->broadcast = false; + QLIST_FOREACH_SAFE(node, &bus->current_devs, next, next) { + QLIST_REMOVE(node, next); + g_free(node); + } +} + +static void i2c_bus_class_init(ObjectClass *klass, void *data) +{ + ResettableClass *rc = RESETTABLE_CLASS(klass); + rc->phases.enter = i2c_bus_enter_reset; +} + + static const TypeInfo i2c_bus_info = { + .name = TYPE_I2C_BUS, + .parent = TYPE_BUS, + .instance_size = sizeof(I2CBus), + .class_size = sizeof(I2CBusClass), + .class_init = i2c_bus_class_init, + }; static int i2c_bus_pre_save(void *opaque) { diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h index 2a3abacd1b..420868a269 100644 --- a/include/hw/i2c/i2c.h +++ b/include/hw/i2c/i2c.h @@ -64,7 +64,7 @@ struct I2CSlave { }; #define TYPE_I2C_BUS "i2c-bus" -OBJECT_DECLARE_SIMPLE_TYPE(I2CBus, I2C_BUS) +OBJECT_DECLARE_TYPE(I2CBus, I2CBusClass, I2C_BUS) typedef struct I2CNode I2CNode; @@ -83,6 +83,10 @@ struct I2CPendingMaster { typedef QLIST_HEAD(I2CNodeList, I2CNode) I2CNodeList; typedef QSIMPLEQ_HEAD(I2CPendingMasters, I2CPendingMaster) I2CPendingMasters; +struct I2CBusClass { + DeviceClass parent_class; +}; + struct I2CBus { BusState qbus; I2CNodeList current_devs;