From patchwork Wed Jun 16 11:59:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 12324927 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=ham 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 85D44C48BE5 for ; Wed, 16 Jun 2021 12:00:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F58761164 for ; Wed, 16 Jun 2021 12:00:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232759AbhFPMCN (ORCPT ); Wed, 16 Jun 2021 08:02:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232750AbhFPMCK (ORCPT ); Wed, 16 Jun 2021 08:02:10 -0400 Received: from mail-pg1-x530.google.com (mail-pg1-x530.google.com [IPv6:2607:f8b0:4864:20::530]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5218FC06175F for ; Wed, 16 Jun 2021 05:00:04 -0700 (PDT) Received: by mail-pg1-x530.google.com with SMTP id m2so1763917pgk.7 for ; Wed, 16 Jun 2021 05:00:04 -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=nDCCmeJMQtzprUTNJPaEV26/JKcM/RuAlK0UO9dpDaw=; b=tOy1eq+e9UVCY4+voZO1PD4Gj2PIOqemKd5Jn+6KhiipXzL4rWtvbxIKXZnWrUzdiw rSbYJ8PbOIr+sKIW+lc90+kDqYg8Wcx6ImFvndEGsi9rdQyt+SAZ/48YNNhHAkfIUJgu qAZvavVINzXM3fECM+lrxL+TbEjVZpgYYCFwIr5ga672Dc8GYD2K340jBrLG/ugVbj8r 8OOay1WaQrvANz2W5ZeNmVCr6qfgSwu+xrNlbR76uMWKpU+LRv5jfdbpxXpCTR7dEzdG 5SKdfOnLxKqG58u9jHSFJv0BTnqO/CL5ow1j6Q97it4RLUYpdq8PirG6N2qLgJWfT6w4 JQIw== 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=nDCCmeJMQtzprUTNJPaEV26/JKcM/RuAlK0UO9dpDaw=; b=M4S7WhYiy6/osKGh68EAvyM47+A+ykjx8IA+phfALnna2oQ95bv82oDqtAlNOz5I55 cEZod0wZc1g+7bxXRp234mfAdj1wF87dMLwxG0uGUyTluDuAPeMSYnIql1mdkgniKf/q 1ASYNWZ64HX/ek9ycVlpgky18+qm03rPkpfojuR/cQWns5YsPMeyLpw+udNhTvZ9ZvGl hww7qhwwJjBlkipMHTa1Vwx0BsIrooHUzPMKC9N2Yy7BHYXjPMqAAA+I7e8RFMTribUT NZVi6uq0wRQBOYgDCipghOJU8/xISqI8fvR7HLOoB8RGqSnpszY0rv2PaPd75bWTjsqr CFSA== X-Gm-Message-State: AOAM530cJLAzrtP1OrC9CWP1R2fW5alehIidN4hg+eUy8c5PGp0Ke1lJ +1W5utkFNCuLu5G0HjWmZ4d8 X-Google-Smtp-Source: ABdhPJxUjnwiBWsgK9hYwfgTV8C2Akip43japtBhBjCZ5Y3x87xjs3Sh/oWZQY/6m6djq5bgWLVa8Q== X-Received: by 2002:a63:d57:: with SMTP id 23mr4704623pgn.392.1623844803681; Wed, 16 Jun 2021 05:00:03 -0700 (PDT) Received: from localhost.localdomain ([2409:4072:280:c67a:95b5:d877:b175:798e]) by smtp.gmail.com with ESMTPSA id m1sm2307646pjk.35.2021.06.16.04.59.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Jun 2021 05:00:03 -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 4/5] PCI: endpoint: Add D_STATE notifier support Date: Wed, 16 Jun 2021 17:29:12 +0530 Message-Id: <20210616115913.138778-5-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 Device State (D_STATE) 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_D_STATE: dstate = dw_pcie_readl_dbi(pci, DBI_CON_STATUS) & 0x3; pci_epc_d_state_notify(epc, dstate); break; ... } ``` EPF --- ``` static int pci_epf_notifier(struct notifier_block *nb, unsigned long val, void *data) { ... case D_STATE: dstate = data; if (dstate == PCIE_EP_D0) /* Handle D0 event */ else if (dstate == PCIE_EP_D3) /* Handle D3 event */ break; ... } ``` Signed-off-by: Manivannan Sadhasivam --- drivers/pci/endpoint/pci-epc-core.c | 18 ++++++++++++++++++ include/linux/pci-epc.h | 1 + include/linux/pci-epf.h | 1 + 3 files changed, 20 insertions(+) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 63fe90dbbba2..b4a7bb3caa97 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -710,6 +710,24 @@ void pci_epc_pme_notify(struct pci_epc *epc, void *data) } EXPORT_SYMBOL_GPL(pci_epc_pme_notify); +/** + * pci_epc_d_state_notify() - Notify the EPF device that the EPC device has + * received the Device State event from Root complex + * @epc: the EPC device that received the Device State event + * @data: Data for the D_STATE notifier + * + * Invoke to notify the EPF device that the EPC device has received the Device + * State (D_STATE) event from the Root complex + */ +void pci_epc_d_state_notify(struct pci_epc *epc, void *data) +{ + if (!epc || IS_ERR(epc)) + return; + + atomic_notifier_call_chain(&epc->notifier, D_STATE, data); +} +EXPORT_SYMBOL_GPL(pci_epc_d_state_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 37dbcade1780..94c66fae8a88 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -206,6 +206,7 @@ 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_pme_notify(struct pci_epc *epc, void *data); +void pci_epc_d_state_notify(struct pci_epc *epc, void *data); 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 c162a73eb836..ca020c080431 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -23,6 +23,7 @@ enum pci_notify_event { LINK_DOWN, BME, PME, + D_STATE, }; enum pci_barno {