From patchwork Thu Jun 1 14:57:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13263944 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 CB4EDC77B7E for ; Thu, 1 Jun 2023 14:58:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234662AbjFAO6R (ORCPT ); Thu, 1 Jun 2023 10:58:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39800 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234669AbjFAO6G (ORCPT ); Thu, 1 Jun 2023 10:58:06 -0400 Received: from mail-pl1-x635.google.com (mail-pl1-x635.google.com [IPv6:2607:f8b0:4864:20::635]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 937501AE for ; Thu, 1 Jun 2023 07:57:54 -0700 (PDT) Received: by mail-pl1-x635.google.com with SMTP id d9443c01a7336-1b01bd7093aso4741455ad.1 for ; Thu, 01 Jun 2023 07:57:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1685631473; x=1688223473; 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=dgsHYUUfC1+pccoNZp6xxO+N3y6D2Bf7E/JuL9C9g4AtbhQDLX3jVytV5jbO7Ldhd5 deA0waQzk2L1V/e1Hzmo8NRo5mvvzc/2XdLX0CS962t0EhmGS9Wc5C0cs2qQCg6655PV x/vO2ka2fyRMqPmy3hWbrK+k8+gT6uOyZAH5uDJaxq2hhJyeYp2UySnbe2/qi03jZGlI +Nd4RwFJXf3kqMTbvUPdxcmXB/mTqsQV/CuiLDcYg7ktqXtNVHcJVd7s+8O4rWDnDwR6 OQ8bRL1j+5xyYwqikzwfQhBwDY+GF8M6WJg7ttUVMt9OU23nbBl9Uh6w8kmyiRiBcrls YB1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685631473; x=1688223473; 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=j74yi871FTai84eBfV/H5Gz4QykbmMOePMMtDCFhIDu5th5BBZLFq8opQJPwVaD8yS pHyaXT+M20yXdxghObcCOlrMzgPDcqqfvpSqR1SVHxMReKU/TadVT6yEZLpgavx+iZA/ ISH+NKVlVDNlYC6wHnBzu8SsHOLuKrWSXrQIKHPGV1tIABJSEqRz1eu5h4Q9a1ame0mI r9je9V+0SXPImxuwfFa0w8i4WUonupFgjgViAZP7nBE8hQdvGBJ+nnhNBDdvx2pwGIz3 B75WzMCJ6qrDbmCBFmv4ca0YagNCZ2nS5bc7i//EiuIzDEs3COLq2BWH3nm2Vxg6TG1T KYYw== X-Gm-Message-State: AC+VfDy0SnvCdNpcKT5cZ3EMIZ1wLC6iyUk/Tk1xEkf/3ugNDAjJBxD7 5RzySbappl1671bNWO5UiJe/ X-Google-Smtp-Source: ACHHUZ7UV+dcrB4tEVVxWfAIJ+mU72SNsaiLlYMV3bnaZr7BkfZwGGyqaYN+rRRkaUB2aD9wDLMp2A== X-Received: by 2002:a17:902:c410:b0:1af:e999:a070 with SMTP id k16-20020a170902c41000b001afe999a070mr9189094plk.14.1685631473230; Thu, 01 Jun 2023 07:57:53 -0700 (PDT) Received: from localhost.localdomain ([117.217.186.123]) by smtp.gmail.com with ESMTPSA id o17-20020a170902d4d100b001b0603829a0sm3577826plg.199.2023.06.01.07.57.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Jun 2023 07:57:52 -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 v5 5/9] PCI: endpoint: Add linkdown notifier support Date: Thu, 1 Jun 2023 20:27:14 +0530 Message-Id: <20230601145718.12204-6-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230601145718.12204-1-manivannan.sadhasivam@linaro.org> References: <20230601145718.12204-1-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 Reviewed-by: Damien Le Moal --- 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); }; /**