From patchwork Wed Jun 16 11:59:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 12324925 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 9DE31C48BE5 for ; Wed, 16 Jun 2021 12:00:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A6586128C for ; Wed, 16 Jun 2021 12:00:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232748AbhFPMCG (ORCPT ); Wed, 16 Jun 2021 08:02:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47632 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232730AbhFPMCF (ORCPT ); Wed, 16 Jun 2021 08:02:05 -0400 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9FB22C0617A6 for ; Wed, 16 Jun 2021 04:59:58 -0700 (PDT) Received: by mail-pj1-x102e.google.com with SMTP id k22-20020a17090aef16b0290163512accedso3543918pjz.0 for ; Wed, 16 Jun 2021 04:59:58 -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=npWguGF+sv+TNIJk7vE0aKrt2xI11hFGoDM/Lo6gWeI=; b=ts5HvtOb7Wrv0uits8CEe7ZZvcqKznlaG53XWIDeJR6mx67o9nm07NJMq6mpKkNVsz w5Hy51TD80CTlRo4fznDWh98W6g+pYqeSrd0g6nEQ/v3jm6duyK8G1IP4TL4lxfGIMz0 COOeUrHnts0K+d56B28v9c3z3cVUx/b3fMGZ1fZyjpKkpp24+4/WeAT8mPwSgwpqx2Aa ozu7XXKBzm+hjrhXDFrD7m280NQJz2TbSNzgE3WQ0PvEX5gzbEysnjNAuZpBMF8yoIji HScaeMw6lLujqkAurwkA0uQUII5c9TPPzCwtBgtks9zr6RIOVuAHd/gN5jlRZIijJDjW NDEg== 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=npWguGF+sv+TNIJk7vE0aKrt2xI11hFGoDM/Lo6gWeI=; b=JwCev7cEzOMaT6CHuiRDAJEvHFVYZ1fEBaXBzywOfca3EkS8GMLBySxOwv0GRaytWR bloyyhKlVcVNAYWVhzVEMXgnclMLOXMZ1rh43wqjRAZrBHX5x9FFYNnidKXDt/1aPUOg SjKt4pq4nv75oy5NJgZlQysVBd3pwvGzxcLM+2Yr52GRFdWpwss0iFQMKO+XHw0Go+fx 2iLHofwk0GcO7hisBrCKBhgavf9gKFgAjZCa1jik2/E4JjQV28NrFkuLyfXsMkk51ogD v41wzb293VJX/55mar9Ocr4FaNqlvjUEVgXiYPHyEI6EZLm/AYRREx42V0VXtr6EaFRr fusg== X-Gm-Message-State: AOAM533PUX+LDYGGb99SYPW5aevylWnkK4rn/Hq6o9htkZ62wpBzuojf QD8RShiwN/eGoqP9kFKG0Ko9 X-Google-Smtp-Source: ABdhPJxL1ftDa9WZT0O9uDcCCoIo532JhmRmV0jNwTjlDC4M9pKhygqcovw0cQ79+JfGzlhxLXNO1g== X-Received: by 2002:a17:90a:e2c6:: with SMTP id fr6mr10415047pjb.198.1623844798144; Wed, 16 Jun 2021 04:59:58 -0700 (PDT) Received: from localhost.localdomain ([2409:4072:280:c67a:95b5:d877:b175:798e]) by smtp.gmail.com with ESMTPSA id m1sm2307646pjk.35.2021.06.16.04.59.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Jun 2021 04:59:57 -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 3/5] PCI: endpoint: Add PME notifier support Date: Wed, 16 Jun 2021 17:29:11 +0530 Message-Id: <20210616115913.138778-4-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 Power Management Event (PME) 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_PM_TURNOFF: pci_epc_pme_notify(epc, PCIE_EP_PM_TURNOFF); break; ... } ``` EPF --- ``` static int pci_epf_notifier(struct notifier_block *nb, unsigned long val, void *data) { ... case PME: pm_state = data; if (pm_state == PCIE_EP_PM_TURNOFF) /* Handle PM Turnoff 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 7e42a83a4877..63fe90dbbba2 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -692,6 +692,24 @@ void pci_epc_bme_notify(struct pci_epc *epc) } EXPORT_SYMBOL_GPL(pci_epc_bme_notify); +/** + * pci_epc_pme_notify() - Notify the EPF device that the EPC device has received + * the PME from the Root complex + * @epc: the EPC device that received the PME + * @data: Data for the PME notifier + * + * Invoke to Notify the EPF device that the EPC device has received the Power + * Management Event (PME) from the Root complex + */ +void pci_epc_pme_notify(struct pci_epc *epc, void *data) +{ + if (!epc || IS_ERR(epc)) + return; + + atomic_notifier_call_chain(&epc->notifier, PME, data); +} +EXPORT_SYMBOL_GPL(pci_epc_pme_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 6c2cff33f670..37dbcade1780 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -205,6 +205,7 @@ 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_pme_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 063a59a58e3c..c162a73eb836 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -22,6 +22,7 @@ enum pci_notify_event { LINK_UP, LINK_DOWN, BME, + PME, }; enum pci_barno {