From patchwork Fri May 19 14:42:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13248431 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 D563DC77B7F for ; Fri, 19 May 2023 14:42:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231250AbjESOmq (ORCPT ); Fri, 19 May 2023 10:42:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232178AbjESOmh (ORCPT ); Fri, 19 May 2023 10:42:37 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 277DB1B5 for ; Fri, 19 May 2023 07:42:33 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id d2e1a72fcca58-64d2a613ec4so1102103b3a.1 for ; Fri, 19 May 2023 07:42:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1684507352; x=1687099352; 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=Y0Nj6xvTZCRiBBoVUykKLMC0GwPG51XjYBpupCLgLXc=; b=K0kt2N60Z5EDo3wlxaZ+oVBbfd+uUCkPvW1R1/lUWTEfqNhl4hXOQl+eW5E17/oMzS PCFqiVb9r7Wc8jfJPdYYoCrOrRd7N9A7gL8M8pCMZiEDZoEpViZrxMnnarTT8rdRG9C0 OmqfRHLljypcQupS9qtAXGgsgSbvLrscESECEJW/Gp6ulvgJHgx8ET5l24XhuBMpV7eI W98QthDpRI7f4JQLIsbiEXclk3yXVSZo/klSfGgPXIs2ZLZU/vn2kJyQIHXxnX7WbaX5 /9Uoqq3aavtqMySbigMN9X1fffeMCDoE3uIgzXL6TPNf46cmtyBMJFD0QKCLO6qiwH8c nlDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684507352; x=1687099352; 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=Y0Nj6xvTZCRiBBoVUykKLMC0GwPG51XjYBpupCLgLXc=; b=cLjcIy2OpdlqW/o8lINp4rYAa2gpl9v4HAlDyv3ANTpig+kbXFpr2yKixlY+Qo0ya6 E/sG0clSry29SiJRoP82doSOZ5QfRIcq9COWRRAeawRRA6aOaMdsGg78DPLholVXbUd6 qunK22MnR0VEi9EADUSMJjMsLdSm6D+QQOpm0zipnhkD53cWm8tL21ODZlwhtd0QEp0B Dhn4JEbGZ/afNGEuGvgta8Rqsso9PXnouJRswieyAv9hkIVTO33VHeNaqg0x4vQOQ3vi ef0UuTkH/DSmqMgCR9XZyfPyR3S3k2/vsDx4uiqE03qTMQSm0AsOTxiMIp2SxG1iWeJc Mvtg== X-Gm-Message-State: AC+VfDwIvVxDc94thQMbAl7bTMR0qnKBzE7gypykpYpERqqZ9S2aqOAh j6NbhJ+8vBAFmSzo5OZUdkea X-Google-Smtp-Source: ACHHUZ4sGOB3ClfNG/LbPnjH5sqnf/3PSsTpHnqi2ZgAMIWLobureM6us2sRu14OIoj/mkT/6Ldqvw== X-Received: by 2002:a05:6a00:13a2:b0:64d:2487:5b20 with SMTP id t34-20020a056a0013a200b0064d24875b20mr3440157pfg.9.1684507352390; Fri, 19 May 2023 07:42:32 -0700 (PDT) Received: from localhost.localdomain ([117.202.184.13]) by smtp.gmail.com with ESMTPSA id v11-20020aa7808b000000b005d22639b577sm3089611pff.165.2023.05.19.07.42.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 May 2023 07:42:32 -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: [PATCH v4 3/7] PCI: endpoint: Add linkdown notifier support Date: Fri, 19 May 2023 20:12:11 +0530 Message-Id: <20230519144215.25167-4-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230519144215.25167-1-manivannan.sadhasivam@linaro.org> References: <20230519144215.25167-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@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 46c9a5c3ca14..1ecbe2b1d3bd 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); }; /**