linux-kernel - [PATCH V3 3/5] PCI: endpoint: Add notification for core init completion

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Date:   Mon, 17 Feb 2020 17:40:34 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <lorenzo.pieralisi@....com>, <andrew.murray@....com>,
        <bhelgaas@...gle.com>, <kishon@...com>, <thierry.reding@...il.com>
CC:     <Jisheng.Zhang@...aptics.com>, <jonathanh@...dia.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kthota@...dia.com>, <mmaddireddy@...dia.com>, <vidyas@...dia.com>,
        <sagar.tv@...il.com>
Subject: [PATCH V3 3/5] PCI: endpoint: Add notification for core init completion

Add support to send notifications to EPF from EPC once the core
registers initialization is complete.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
Acked-by: Kishon Vijay Abraham I <kishon@...com>
---
V3:
* Added Acked-by: Kishon Vijay Abraham I <kishon@...com>

V2:
* None

 drivers/pci/endpoint/pci-epc-core.c | 19 ++++++++++++++++++-
 include/linux/pci-epc.h             |  1 +
 include/linux/pci-epf.h             |  5 +++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index dc1c673534e0..0d22a377a0cf 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -540,10 +540,27 @@ void pci_epc_linkup(struct pci_epc *epc)
 	if (!epc || IS_ERR(epc))
 		return;
 
-	atomic_notifier_call_chain(&epc->notifier, 0, NULL);
+	atomic_notifier_call_chain(&epc->notifier, LINK_UP, NULL);
 }
 EXPORT_SYMBOL_GPL(pci_epc_linkup);
 
+/**
+ * pci_epc_init_notify() - Notify the EPF device that EPC device's core
+ *			   initialization is completed.
+ * @epc: the EPC device whose core initialization is completeds
+ *
+ * Invoke to Notify the EPF device that the EPC device's initialization
+ * is completed.
+ */
+void pci_epc_init_notify(struct pci_epc *epc)
+{
+	if (!epc || IS_ERR(epc))
+		return;
+
+	atomic_notifier_call_chain(&epc->notifier, CORE_INIT, NULL);
+}
+EXPORT_SYMBOL_GPL(pci_epc_init_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 9ffe6bd081ae..0d7e91bad91e 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -165,6 +165,7 @@ void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
 void pci_epc_destroy(struct pci_epc *epc);
 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
 void pci_epc_linkup(struct pci_epc *epc);
+void pci_epc_init_notify(struct pci_epc *epc);
 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
 int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
 			 struct pci_epf_header *hdr);
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index bcdf4f07bde7..0c628e30c582 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -15,6 +15,11 @@
 
 struct pci_epf;
 
+enum pci_notify_event {
+	CORE_INIT,
+	LINK_UP,
+};
+
 enum pci_barno {
 	BAR_0,
 	BAR_1,
-- 
2.17.1