From patchwork Fri Sep 8 06:53:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Chaitanya Chundru X-Patchwork-Id: 13377177 X-Patchwork-Delegate: manivannanece23@gmail.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 0A165EE57D6 for ; Fri, 8 Sep 2023 06:54:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242274AbjIHGyQ (ORCPT ); Fri, 8 Sep 2023 02:54:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241965AbjIHGyP (ORCPT ); Fri, 8 Sep 2023 02:54:15 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A8BE19B4; Thu, 7 Sep 2023 23:54:11 -0700 (PDT) Received: from pps.filterd (m0279868.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3885tpS1010247; Fri, 8 Sep 2023 06:54:01 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : date : subject : mime-version : content-type : content-transfer-encoding : message-id : references : in-reply-to : to : cc; s=qcppdkim1; bh=2922vILVa8UJXhvum/nKfQlEzI1uMBYh7Kut3LGMBrs=; b=awLv6CKbemw3yR1i7+m4DBwr1zRKAxC5M/v57phNhAoH5OO3n9X8SzisGM2kV3/igl2h Uj19ViKEd2F5FKWQcwH9ybtn3XWUhueaOSIVdmICzt3AZJlYRqrUBaDKMRbRUIkhK/PS bk2z3PnO6pnozwnmI4wysOHX2pRoiWaUMghxycEv9TWKEpel5ETWNfEOInIzzEjcIn21 qiW9wnWOCARjZYArzFZD1wTlDR33NoQpg6atouEoeymqMprL0mEwlmKeix8CyIh9KROh TUBut4kB70c3eWGKldUA4YljUfAWCSH4aFVD1QjjLpqVqpgMfaAb2JLcaKtCHakqas+8 7w== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3syk9ns8cw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 08 Sep 2023 06:54:01 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3886s00N025755 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 8 Sep 2023 06:54:00 GMT Received: from hu-krichai-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Thu, 7 Sep 2023 23:53:56 -0700 From: Krishna chaitanya chundru Date: Fri, 8 Sep 2023 12:23:35 +0530 Subject: [PATCH v6 1/4] PCI: endpoint: Add D-state change notifier support MIME-Version: 1.0 Message-ID: <20230908-dstate_change-v6-1-b414a6edd765@quicinc.com> References: <20230908-dstate_change-v6-0-b414a6edd765@quicinc.com> In-Reply-To: <20230908-dstate_change-v6-0-b414a6edd765@quicinc.com> To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Manivannan Sadhasivam , Kishon Vijay Abraham I , Bjorn Helgaas , Jonathan Corbet , Rob Herring CC: , , , , , Krishna chaitanya chundru X-Mailer: b4 0.13-dev-83828 X-Developer-Signature: v=1; a=ed25519-sha256; t=1694156032; l=3437; i=quic_krichai@quicinc.com; s=20230907; h=from:subject:message-id; bh=jbgDRmZQrRxWP8VxR+Ppt4oqP/vV7+WYZt1SMSTQ3/o=; b=/Qn7oG4alWE3ShI9UBDarOrMB4EsvgRBxFakJpi/nhn9gGwVHkUFHsH6mmruHgPv6m4EtBhFY KX7Y6T/OtrSAPP+nFxAv4liF6exDTmqLLRv0OsCGyNjbnFZuSBTqmDU X-Developer-Key: i=quic_krichai@quicinc.com; a=ed25519; pk=10CL2pdAKFyzyOHbfSWHCD0X0my7CXxj8gJScmn1FAg= X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: zMAcOPpOuFOxXjxwDOEJYehbWSsl6WyF X-Proofpoint-GUID: zMAcOPpOuFOxXjxwDOEJYehbWSsl6WyF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-08_03,2023-09-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 impostorscore=0 phishscore=0 clxscore=1015 suspectscore=0 mlxlogscore=797 mlxscore=0 priorityscore=1501 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309080062 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add support to notify the EPF device about the D-state change event from the EPC device. Signed-off-by: Krishna chaitanya chundru --- Documentation/PCI/endpoint/pci-endpoint.rst | 4 ++++ drivers/pci/endpoint/pci-epc-core.c | 24 ++++++++++++++++++++++++ include/linux/pci-epc.h | 1 + include/linux/pci-epf.h | 2 ++ 4 files changed, 31 insertions(+) diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst index 4f5622a65555..a1d610f612b4 100644 --- a/Documentation/PCI/endpoint/pci-endpoint.rst +++ b/Documentation/PCI/endpoint/pci-endpoint.rst @@ -78,6 +78,10 @@ by the PCI controller driver. Cleanup the pci_epc_mem structure allocated during pci_epc_mem_init(). +* pci_epc_dstate_notify() + + Notify all the function drivers that the EPC device has changed its D-state. + EPC APIs for the PCI Endpoint Function Driver ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 5a4a8b0be626..4d589a5c96f0 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -783,6 +783,30 @@ void pci_epc_bme_notify(struct pci_epc *epc) } EXPORT_SYMBOL_GPL(pci_epc_bme_notify); +/** + * pci_epc_dstate_notify() - Notify the EPF driver that EPC device D-state + * has changed + * @epc: the EPC device which has change in D-state + * @state: the changed D-state + * + * Invoke to Notify the EPF device that the EPC device D-state has + * changed. + */ +void pci_epc_dstate_notify(struct pci_epc *epc, pci_power_t state) +{ + struct pci_epf *epf; + + 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->dstate_notify) + epf->event_ops->dstate_notify(epf, state); + mutex_unlock(&epf->lock); + } + mutex_unlock(&epc->list_lock); +} +EXPORT_SYMBOL_GPL(pci_epc_dstate_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 5cb694031072..225a5a88627f 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -251,4 +251,5 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, phys_addr_t *phys_addr, size_t size); void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr, void __iomem *virt_addr, size_t size); +void pci_epc_dstate_notify(struct pci_epc *epc, pci_power_t state); #endif /* __LINUX_PCI_EPC_H */ diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 3f44b6aec477..b2178bb0e976 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -73,12 +73,14 @@ struct pci_epf_ops { * @link_up: Callback for the EPC link up event * @link_down: Callback for the EPC link down event * @bme: Callback for the EPC BME (Bus Master Enable) event + * @dstate_notify: Callback for the EPC D-state change 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); int (*bme)(struct pci_epf *epf); + int (*dstate_notify)(struct pci_epf *epf, pci_power_t state); }; /**