From patchwork Mon May 2 06:06:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 12833876 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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 23D93C433EF for ; Mon, 2 May 2022 06:06:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348929AbiEBGKI (ORCPT ); Mon, 2 May 2022 02:10:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383424AbiEBGKH (ORCPT ); Mon, 2 May 2022 02:10:07 -0400 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67D574EF49 for ; Sun, 1 May 2022 23:06:37 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id z16so11555937pfh.3 for ; Sun, 01 May 2022 23:06:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=FL4JimMUhmY1BeTMTK+TnPmU576KVxmETjweuyLuCOo=; b=OFXE66pE/ktWSt/5voVeEhMhzzjJ3ORO0W5OjxJds9qw+k7j2EG9ORxSHmD5i8yEm5 nC9O4KPZiYx+rv4InxZiPdWLN2X4hDs0DhNp1k2iT/ZeAFpAmYyTDJIBCYb9udtNrq+G xPCzCRXZ2b+LgvRYHNkcR98uDFeQdjZNhZ9q7kZSRWU2Z0MDzV3ZeYTHPoWoNpv7+fQs cky8tLry5aLxOdICsNscsAYGlpDeRdlIcFXEG11VuGjhzJ9+YMFlhmiwe7E7yb13rf+H 4HE25MLXBrJ52iZQPuL9A9rrp+85ZdIa9POCM2WQQBOBUr8zfcQh0BR8L4/uAdM8Mxz6 4TuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=FL4JimMUhmY1BeTMTK+TnPmU576KVxmETjweuyLuCOo=; b=rg8iLMDwTYiqS38r5vQolJi3L58DnU3UDNhnRJnrTay/V12S6dC+h73s4BQNQGHm3P 5ze+z4dxp9p6ju9PocjSjLMW6NllGj+6Sn2RRU8bS/O1kzJaKElotMYe6DmVUAp8PNlU frFMMuy4OUGz7i19y3+hLZ0nPhE7cWrYGpJzMNk1DVIu8LED8HRZDtQsBv6u6vnkYrn5 Ik98CX/yWXePHkmPdWUwqIFFj8Vw2bH4No2jQPi3t02WZ/BpeNxNw7ya6wcm/M5/1vAM Z6sBrgWpSJqkGMDyHpZs80DREtEvW0OPB6MSjleNKbJUTeSFgq5X2+ibGrFcbPJymhCu 9P6Q== X-Gm-Message-State: AOAM530lHV15XsAWCm3AJgh0WBwsETQ8BBQpJPhCh19L4+e3ylN+w6Wv aLjN/tL+NHy1BIOsaEa8bkk3 X-Google-Smtp-Source: ABdhPJxb6iPxT001JHILmsfK5SvyQcjtft+sZmMyKCsyzDQDauyPZCbU2PiXuVxii4Sz+RFpxlBhLQ== X-Received: by 2002:a62:e518:0:b0:4fa:9333:ddbd with SMTP id n24-20020a62e518000000b004fa9333ddbdmr10156182pff.11.1651471596890; Sun, 01 May 2022 23:06:36 -0700 (PDT) Received: from localhost.localdomain ([27.111.75.99]) by smtp.gmail.com with ESMTPSA id h3-20020a62b403000000b0050dc7628181sm3933826pfn.91.2022.05.01.23.06.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 May 2022 23:06:36 -0700 (PDT) From: Manivannan Sadhasivam To: kishon@ti.com, lorenzo.pieralisi@arm.com, kw@linux.com, bhelgaas@google.com, robh@kernel.org Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH 4/8] PCI: endpoint: Add linkdown notifier support Date: Mon, 2 May 2022 11:36:07 +0530 Message-Id: <20220502060611.58987-5-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220502060611.58987-1-manivannan.sadhasivam@linaro.org> References: <20220502060611.58987-1-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. Signed-off-by: Manivannan Sadhasivam --- drivers/pci/endpoint/pci-epc-core.c | 17 +++++++++++++++++ include/linux/pci-epc.h | 1 + include/linux/pci-epf.h | 1 + 3 files changed, 19 insertions(+) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 3bc9273d0a08..8401c2750c9e 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -697,6 +697,23 @@ 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) +{ + if (!epc || IS_ERR(epc)) + return; + + atomic_notifier_call_chain(&epc->notifier, LINK_DOWN, NULL); +} +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 c414a08bfd67..d346ab9ae061 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -215,6 +215,7 @@ 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 0c94cc1513bc..b1fcd88d0b1f 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -20,6 +20,7 @@ enum pci_epc_interface_type; enum pci_notify_event { CORE_INIT, LINK_UP, + LINK_DOWN, }; enum pci_barno {