From patchwork Thu Jun 1 15:00:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 687798 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 520FFC7EE32 for ; Thu, 1 Jun 2023 15:04:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234920AbjFAPEk (ORCPT ); Thu, 1 Jun 2023 11:04:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233977AbjFAPEJ (ORCPT ); Thu, 1 Jun 2023 11:04:09 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1B8A110FA for ; Thu, 1 Jun 2023 08:03:08 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id d9443c01a7336-1b041ccea75so4321095ad.2 for ; Thu, 01 Jun 2023 08:03:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1685631693; x=1688223693; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=VhNik2H+uO+Q16HqIS1xj7FIQ3fy5k7mBkKyNDoBImY=; b=WKzaDxUtNpoIhHJsiP+Qn1HVUMwainlhhT58gioDLsTG3F5oJDLYr56PVfjOW8bSuh 3C2H5dsdDF/YpNxOsgFU4WTOAUS3pYneV2bPxPyB50lSb344UVF9PGblfrdlsqDgs9Bs 6nufHzFWlZeoFysVB0ISdLsiJXG2trxiYRDnv1qafV1BolGAaPx0uX7UvT07+FB18QvF cT7jPAJGzNhbzUY0KPRgq79V3qfonU9rt5pTgNSYXzj/GeniOfA8jg0ccrgwIjjyDJsO Okjt6MHdeDJGoLZODDRmPxXOFyYEEVUsvC8IHBZYI38wFvDCaMyDxjADpmR3nt5I04BB W9iA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685631693; x=1688223693; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=VhNik2H+uO+Q16HqIS1xj7FIQ3fy5k7mBkKyNDoBImY=; b=WoIJ8FUJez5caNMAXSOvDsL28t6Dq37FXeos1gscX7MPFl0V+gOLGqFxiW8REg5Y6/ W0LeJ8wara2/PdtWHyRlUoacrdVUD5oIgPZVFRehxM/JRPedawCB07ogc69O/ALrq2ST V2G6fsnpwLWB1uB8b7volOrYNZ7ukq5vP1hqTnI6UvYREICsckZzG9JKr3Ps3B/rPPhR sjnhTZ5wN8dl/kIgzcL5P/jtvYZ8rgIUXYzeQQs8TJijBnS/4etJMbF9OT/lIsKFyTiv W5Q1UIyAanIGCkNuwAhr7U/U5KdGpFLxlJzDAQYxYNOrwD9vJIILsRebBQkqrdrqS1VG NSrg== X-Gm-Message-State: AC+VfDxI4A0l+7hWnRuS79gzeCy6mgpA3qzvUYHHJl6sqeQfXudXMV53 bTQsVW8iSz90HUUkcouL937h X-Google-Smtp-Source: ACHHUZ5+MKnMmJzNtUGoowhdad6GFIl/LMgWREXq4bKkrRQXpbnFOgG6hPwxZM1axeUpBCKTAnV6Vg== X-Received: by 2002:a17:902:ea12:b0:1b0:66b6:6ae5 with SMTP id s18-20020a170902ea1200b001b066b66ae5mr6653102plg.61.1685631692871; Thu, 01 Jun 2023 08:01:32 -0700 (PDT) Received: from localhost.localdomain ([117.217.186.123]) by smtp.gmail.com with ESMTPSA id q7-20020a170902dac700b001b0499bee11sm3595480plx.240.2023.06.01.08.01.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Jun 2023 08:01:32 -0700 (PDT) From: Manivannan Sadhasivam To: lpieralisi@kernel.org, kw@linux.com Cc: kishon@kernel.org, bhelgaas@google.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Manivannan Sadhasivam Subject: [RESEND PATCH v5 4/9] PCI: endpoint: Add linkdown notifier support Date: Thu, 1 Jun 2023 20:30:58 +0530 Message-Id: <20230601150103.12755-5-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230601150103.12755-1-manivannan.sadhasivam@linaro.org> References: <20230601150103.12755-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add support to notify the EPF device about the linkdown event from the EPC device. Reviewed-by: Kishon Vijay Abraham I Signed-off-by: Manivannan Sadhasivam --- drivers/pci/endpoint/pci-epc-core.c | 26 ++++++++++++++++++++++++++ include/linux/pci-epc.h | 1 + include/linux/pci-epf.h | 2 ++ 3 files changed, 29 insertions(+) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 0cf602c83d4a..e0570b52698d 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -706,6 +706,32 @@ void pci_epc_linkup(struct pci_epc *epc) } EXPORT_SYMBOL_GPL(pci_epc_linkup); +/** + * pci_epc_linkdown() - Notify the EPF device that EPC device has dropped the + * connection with the Root Complex. + * @epc: the EPC device which has dropped the link with the host + * + * Invoke to Notify the EPF device that the EPC device has dropped the + * connection with the Root Complex. + */ +void pci_epc_linkdown(struct pci_epc *epc) +{ + struct pci_epf *epf; + + if (!epc || IS_ERR(epc)) + return; + + mutex_lock(&epc->list_lock); + list_for_each_entry(epf, &epc->pci_epf, list) { + mutex_lock(&epf->lock); + if (epf->event_ops && epf->event_ops->link_down) + epf->event_ops->link_down(epf); + mutex_unlock(&epf->lock); + } + mutex_unlock(&epc->list_lock); +} +EXPORT_SYMBOL_GPL(pci_epc_linkdown); + /** * pci_epc_init_notify() - Notify the EPF device that EPC device's core * initialization is completed. diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index 301bb0e53707..63a6cc5e5282 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -203,6 +203,7 @@ void pci_epc_destroy(struct pci_epc *epc); int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, enum pci_epc_interface_type type); void pci_epc_linkup(struct pci_epc *epc); +void pci_epc_linkdown(struct pci_epc *epc); void pci_epc_init_notify(struct pci_epc *epc); void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf, enum pci_epc_interface_type type); diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index bc613f0df7e3..f8e5a63d0c83 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -71,10 +71,12 @@ struct pci_epf_ops { * struct pci_epf_event_ops - Callbacks for capturing the EPC events * @core_init: Callback for the EPC initialization complete event * @link_up: Callback for the EPC link up event + * @link_down: Callback for the EPC link down event */ struct pci_epc_event_ops { int (*core_init)(struct pci_epf *epf); int (*link_up)(struct pci_epf *epf); + int (*link_down)(struct pci_epf *epf); }; /**