linux-kernel - [PATCH v2 1/3] PCI: endpoint: Add 'started' to pci_epc to set whether the controller is started

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Message-Id: <1611500977-24816-2-git-send-email-hayashi.kunihiko@socionext.com>
Date:   Mon, 25 Jan 2021 00:09:35 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kishon Vijay Abraham I <kishon@...com>
Cc:     linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Subject: [PATCH v2 1/3] PCI: endpoint: Add 'started' to pci_epc to set whether the controller is started

This adds a member 'started' as a boolean value to struct pci_epc to set
whether the controller is started, and also adds a function to get the
value.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
---
 drivers/pci/endpoint/pci-epc-core.c | 2 ++
 include/linux/pci-epc.h             | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index cc8f9eb..2904175 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -174,6 +174,7 @@ void pci_epc_stop(struct pci_epc *epc)
 
 	mutex_lock(&epc->lock);
 	epc->ops->stop(epc);
+	epc->started = false;
 	mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_stop);
@@ -196,6 +197,7 @@ int pci_epc_start(struct pci_epc *epc)
 
 	mutex_lock(&epc->lock);
 	ret = epc->ops->start(epc);
+	epc->started = true;
 	mutex_unlock(&epc->lock);
 
 	return ret;
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index b82c9b1..5808952 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -131,6 +131,7 @@ struct pci_epc_mem {
  * @lock: mutex to protect pci_epc ops
  * @function_num_map: bitmap to manage physical function number
  * @notifier: used to notify EPF of any EPC events (like linkup)
+ * @started: true if this EPC is started
  */
 struct pci_epc {
 	struct device			dev;
@@ -145,6 +146,7 @@ struct pci_epc {
 	struct mutex			lock;
 	unsigned long			function_num_map;
 	struct atomic_notifier_head	notifier;
+	bool				started;
 };
 
 /**
@@ -191,6 +193,11 @@ pci_epc_register_notifier(struct pci_epc *epc, struct notifier_block *nb)
 	return atomic_notifier_chain_register(&epc->notifier, nb);
 }
 
+static inline bool pci_epc_is_started(struct pci_epc *epc)
+{
+	return epc->started;
+}
+
 struct pci_epc *
 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 		      struct module *owner);
-- 
2.7.4