From patchwork Wed Jun 16 11:59:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 12324923 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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62A13C48BE8 for ; Wed, 16 Jun 2021 11:59:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4711961164 for ; Wed, 16 Jun 2021 11:59:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232733AbhFPMB7 (ORCPT ); Wed, 16 Jun 2021 08:01:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232732AbhFPMB7 (ORCPT ); Wed, 16 Jun 2021 08:01:59 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9DF8AC061760 for ; Wed, 16 Jun 2021 04:59:52 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id o88-20020a17090a0a61b029016eeb2adf66so3644302pjo.4 for ; Wed, 16 Jun 2021 04:59:52 -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=WfSzf8q0eDZEzZPtPn8LE1Enrwc2IXUI8dRvj+qdHQ8=; b=SX6MbQxJx5bNXDC6+qbOT/3mfAikMaXeRvr8mtzXSi6Y5nk1XvlW2FSIFqRFGkhdk+ lb16UwwjM1g39AKfZTTox6tw9FqQEwswEy2CJEA7hsl+Re1jouxBGvYLl33FwhLeinLS RlWV7aL4DzGOEHg9qE6BijM0jE4SRM/TyJRoLA5LzFA+FPK1pcUrQS6aEuQziKTrg9Kb zTZNWFnixekHNIE6K2Ui/OtxeNj1eEq37lo4qTU9k+7ArbNCpvA5Vn2oQVsIZiZG2L5s 7JEpp+rWWH3Kv5G1nYpmrHl4bEMh8S9ecNy6pVkxn4c7ejSHN/pKApheynl7n6MTpO7f QC8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=WfSzf8q0eDZEzZPtPn8LE1Enrwc2IXUI8dRvj+qdHQ8=; b=t7YL/Wz7AL3CeyyXBxQEamrKeDWBMoqhBwbJQ6E9zfyycJXlcDZyoaPU3jym0pICJK 5wBNGhD9btAsNEZASpBgWhyu/2/juuyataYzUrrblDfFyoyMgfxg5stM2G/Uu1r+OA85 V8rfVhRkzOBxbhhy0Mai54DucId419RaI9nMbzY6E9TybgdlLxT33yRP77uQvxpQdhSN ku/9pHJHj+zjFU6kJSnWphF+sKMhdFPsPSu9IP+colFy/2R6fuJNvMLtJtsDOgG3+Ekk zTAtWK75lWiTXA7BelfmRP+7ycBBG2CGX0EszmVDQx40luDIAestqHZQ0x2ukCxM9VqM MMpw== X-Gm-Message-State: AOAM5304GaD3j/jECeh+EHXKtzNFegbN3eDE6Mi7i7GA5efpT7QYTuxm eRi7gfEcB3VY8kZk9KnwUVveTWmVX3Y1 X-Google-Smtp-Source: ABdhPJzOXaw9Lc+Rhu2YNag2D4DTkzJU8HQpS1MnTFqW8OP6Smn+UtaBaZt1gceNdtNTIErDnOwVKA== X-Received: by 2002:a17:90b:3b92:: with SMTP id pc18mr4589519pjb.100.1623844792049; Wed, 16 Jun 2021 04:59:52 -0700 (PDT) Received: from localhost.localdomain ([2409:4072:280:c67a:95b5:d877:b175:798e]) by smtp.gmail.com with ESMTPSA id m1sm2307646pjk.35.2021.06.16.04.59.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Jun 2021 04:59:51 -0700 (PDT) From: Manivannan Sadhasivam To: kishon@ti.com, lorenzo.pieralisi@arm.com, bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org, smohanad@codeaurora.org, Manivannan Sadhasivam Subject: [PATCH 2/5] PCI: endpoint: Add BME notifier support Date: Wed, 16 Jun 2021 17:29:10 +0530 Message-Id: <20210616115913.138778-3-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210616115913.138778-1-manivannan.sadhasivam@linaro.org> References: <20210616115913.138778-1-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 Bus Master Enable (BME) event received by the EPC device from the Root complex. Usage: ====== EPC --- ``` static irqreturn_t pcie_ep_irq(int irq, void *data) { ... case PCIE_EP_INT_BME: pci_epc_bme_notify(epc); break; ... } ``` EPF --- ``` static int pci_epf_notifier(struct notifier_block *nb, unsigned long val, void *data) { ... case BME: /* Handle BME event */ break; ... } ``` 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 f29d78c18438..7e42a83a4877 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -675,6 +675,23 @@ void pci_epc_init_notify(struct pci_epc *epc) } EXPORT_SYMBOL_GPL(pci_epc_init_notify); +/** + * pci_epc_bme_notify() - Notify the EPF device that the EPC device has received + * the BME event from the Root complex + * @epc: the EPC device that received the BME event + * + * Invoke to Notify the EPF device that the EPC device has received the Bus + * Master Enable (BME) event from the Root complex + */ +void pci_epc_bme_notify(struct pci_epc *epc) +{ + if (!epc || IS_ERR(epc)) + return; + + atomic_notifier_call_chain(&epc->notifier, BME, NULL); +} +EXPORT_SYMBOL_GPL(pci_epc_bme_notify); + /** * pci_epc_destroy() - destroy the EPC device * @epc: the EPC device that has to be destroyed diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index 23590efc13e7..6c2cff33f670 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -204,6 +204,7 @@ int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, 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_bme_notify(struct pci_epc *epc); void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf, enum pci_epc_interface_type type); int pci_epc_write_header(struct pci_epc *epc, u8 func_no, diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index e9ad634b1575..063a59a58e3c 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -21,6 +21,7 @@ enum pci_notify_event { CORE_INIT, LINK_UP, LINK_DOWN, + BME, }; enum pci_barno {