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Wed, 10 Jul 2024 11:08:29 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 15.2.1544.9; Wed, 10 Jul 2024 04:08:24 -0700 From: Krishna chaitanya chundru Date: Wed, 10 Jul 2024 16:38:14 +0530 Subject: [PATCH v7 1/4] PCI: endpoint: Add D-state change notifier support Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240710-dstate_notifier-v7-1-8d45d87b2b24@quicinc.com> References: <20240710-dstate_notifier-v7-0-8d45d87b2b24@quicinc.com> In-Reply-To: <20240710-dstate_notifier-v7-0-8d45d87b2b24@quicinc.com> To: Manivannan Sadhasivam , =?utf-8?q?Krzy?= =?utf-8?q?sztof_Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , Jonathan Corbet , Lorenzo Pieralisi , Rob Herring CC: , , , , , , , , , , "Krishna chaitanya chundru" X-Mailer: b4 0.13-dev-83828 X-Developer-Signature: v=1; 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Signed-off-by: Krishna chaitanya chundru --- Documentation/PCI/endpoint/pci-endpoint.rst | 3 +++ drivers/pci/endpoint/pci-epc-core.c | 24 ++++++++++++++++++++++++ include/linux/pci-epc.h | 2 ++ 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 21507e3cc238..3eb5648ca7ec 100644 --- a/Documentation/PCI/endpoint/pci-endpoint.rst +++ b/Documentation/PCI/endpoint/pci-endpoint.rst @@ -77,6 +77,9 @@ 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 84309dfe0c68..e2b9c458f2c4 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -828,6 +828,30 @@ void pci_epc_bus_master_enable_notify(struct pci_epc *epc) } EXPORT_SYMBOL_GPL(pci_epc_bus_master_enable_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 85bdf2adb760..e473d1780928 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -276,6 +276,8 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, 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); + #else static inline void pci_epc_init_notify(struct pci_epc *epc) { diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 18a3aeb62ae4..d88063cdb067 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -75,6 +75,7 @@ struct pci_epf_ops { * @link_up: Callback for the EPC link up event * @link_down: Callback for the EPC link down event * @bus_master_enable: Callback for the EPC Bus Master Enable event + * @dstate_notify: Callback for the EPC D-state change event */ struct pci_epc_event_ops { int (*epc_init)(struct pci_epf *epf); @@ -82,6 +83,7 @@ struct pci_epc_event_ops { int (*link_up)(struct pci_epf *epf); int (*link_down)(struct pci_epf *epf); int (*bus_master_enable)(struct pci_epf *epf); + int (*dstate_notify)(struct pci_epf *epf, pci_power_t state); }; /**