From patchwork Fri Jun 30 10:52:04 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: 698332 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 48B58C001DB for ; Fri, 30 Jun 2023 10:53:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232543AbjF3KxB (ORCPT ); Fri, 30 Jun 2023 06:53:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229945AbjF3Kw5 (ORCPT ); Fri, 30 Jun 2023 06:52:57 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C0E40358A; Fri, 30 Jun 2023 03:52:56 -0700 (PDT) Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 35UAMUMk021002; Fri, 30 Jun 2023 10:52:49 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=qcppdkim1; bh=qSBCqNr7HThrO5qc+qjL+xE0BVneevTd9s/gLlHxryg=; b=euhuaAwbByL1i4WX75FucNX1MhNhLRQmcg1CIjKuKkefKGmyNJTH3JBX6UcXqXy68qQu 52xY1LUvmr8xtLOETNyL+l6DsOkVXqI12cp5PA63/rM+CsK6ZDna5HKcbFGY0EoH5n0I 2a3Dp5hPF2Ks3OagLdXHr8JpATU7Fj0sJqvMthw4n0uK/hTTOrJGPXv+Ke8uiA8u4yOg ygt3rMLsFxbZ0hqGrLqhP8fX04WMFZV0xdX9fWB6PnWWbMAMyc8Z/1YM0GkFVRluqQ39 vSSZENh6upHd1/74KljiLxAxOckyxTQPEJUYyQjUJr/eJwXyQaGGpqH93m15uVZgJdCt iQ== Received: from apblrppmta02.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3rhgpgsfsv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 30 Jun 2023 10:52:48 +0000 Received: from pps.filterd (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 35UAqD3C004632; Fri, 30 Jun 2023 10:52:13 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTPS id 3rdsjkpf1v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 30 Jun 2023 10:52:13 +0000 Received: from APBLRPPMTA02.qualcomm.com (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 35UAqD8I004615; Fri, 30 Jun 2023 10:52:13 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-krichai-hyd.qualcomm.com [10.213.110.112]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTP id 35UAqCKw004608; Fri, 30 Jun 2023 10:52:13 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 4058933) id 6572F4AC1; Fri, 30 Jun 2023 16:22:12 +0530 (+0530) From: Krishna chaitanya chundru To: manivannan.sadhasivam@linaro.org Cc: helgaas@kernel.org, linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_vbadigan@quicinc.com, quic_nitegupt@quicinc.com, quic_skananth@quicinc.com, quic_ramkri@quicinc.com, krzysztof.kozlowski@linaro.org, Krishna chaitanya chundru , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Manivannan Sadhasivam , Kishon Vijay Abraham I , Bjorn Helgaas , Jonathan Corbet , linux-doc@vger.kernel.org (open list:DOCUMENTATION) Subject: [PATCH v2 1/8] PCI: endpoint: Add dstate change notifier support Date: Fri, 30 Jun 2023 16:22:04 +0530 Message-Id: <1688122331-25478-2-git-send-email-quic_krichai@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1688122331-25478-1-git-send-email-quic_krichai@quicinc.com> References: <1688122331-25478-1-git-send-email-quic_krichai@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: m1pEml9JmOHLsp6VdZM8Vr4ehwpZcudg X-Proofpoint-ORIG-GUID: m1pEml9JmOHLsp6VdZM8Vr4ehwpZcudg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-30_05,2023-06-30_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 priorityscore=1501 bulkscore=0 mlxlogscore=830 adultscore=0 suspectscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306300092 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@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 | 5 +++++ drivers/pci/endpoint/pci-epc-core.c | 27 +++++++++++++++++++++++++++ include/linux/pci-epc.h | 1 + include/linux/pci-epf.h | 1 + 4 files changed, 34 insertions(+) diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst index 4f5622a..0538cdc 100644 --- a/Documentation/PCI/endpoint/pci-endpoint.rst +++ b/Documentation/PCI/endpoint/pci-endpoint.rst @@ -78,6 +78,11 @@ by the PCI controller driver. Cleanup the pci_epc_mem structure allocated during pci_epc_mem_init(). +* pci_epc_dstate_change() + + In order to notify all the function devices 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 6c54fa5..cad360f 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -785,6 +785,33 @@ void pci_epc_bme_notify(struct pci_epc *epc) EXPORT_SYMBOL_GPL(pci_epc_bme_notify); /** + * pci_epc_dstate_change() - Notify the EPF device 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 has D-state has + * changed. + */ +void pci_epc_dstate_change(struct pci_epc *epc, pci_power_t state) +{ + 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->dstate_change) + epf->event_ops->dstate_change(epf, state); + mutex_unlock(&epf->lock); + } + mutex_unlock(&epc->list_lock); +} +EXPORT_SYMBOL_GPL(pci_epc_dstate_change); + +/** * 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 5cb6940..26a1108 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_change(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 4b52807..1d3c2a2 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -79,6 +79,7 @@ struct pci_epc_event_ops { int (*link_up)(struct pci_epf *epf); int (*link_down)(struct pci_epf *epf); int (*bme)(struct pci_epf *epf); + int (*dstate_change)(struct pci_epf *epf, pci_power_t state); }; /**