Merge branch 'pci/endpoint'

- Convert dra7xx to threaded IRQ handler (Manivannan Sadhasivam)

- Move tegra194 dw_pcie_ep_linkup() to threaded IRQ handler (Manivannan
  Sadhasivam)

- Add a separate lock for the endpoint pci_epf list to avoid deadlock
  while running callbacks (Manivannan Sadhasivam)

- Use callbacks instead of notifier chains to signal events from EPC to EPF
  drivers (Manivannan Sadhasivam)

- Use link_up() callback in place of LINK_UP notifier (Manivannan
  Sadhasivam)

* pci/endpoint:
  PCI: endpoint: Use link_up() callback in place of LINK_UP notifier
  PCI: endpoint: Use callback mechanism for passing events from EPC to EPF
  PCI: endpoint: Use a separate lock for protecting epc->pci_epf list
  PCI: tegra194: Move dw_pcie_ep_linkup() to threaded IRQ handler
  PCI: dra7xx: Use threaded IRQ handler for "dra7xx-pcie-main" IRQ

2 files changed, 14 insertions, 15 deletions

diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index a48778e1a4ee..301bb0e53707 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -122,6 +122,7 @@ struct pci_epc_mem {
  * struct pci_epc - represents the PCI EPC device
  * @dev: PCI EPC device
  * @pci_epf: list of endpoint functions present in this EPC device
+ * list_lock: Mutex for protecting pci_epf list
  * @ops: function pointers for performing endpoint operations
  * @windows: array of address space of the endpoint controller
  * @mem: first window of the endpoint controller, which corresponds to
@@ -134,11 +135,11 @@ struct pci_epc_mem {
  * @group: configfs group representing the PCI EPC device
  * @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)
  */
 struct pci_epc {
 	struct device			dev;
 	struct list_head		pci_epf;
+	struct mutex			list_lock;
 	const struct pci_epc_ops	*ops;
 	struct pci_epc_mem		**windows;
 	struct pci_epc_mem		*mem;
@@ -149,7 +150,6 @@ struct pci_epc {
 	/* mutex to protect against concurrent access of EP controller */
 	struct mutex			lock;
 	unsigned long			function_num_map;
-	struct atomic_notifier_head	notifier;
 };
 
 /**
@@ -192,12 +192,6 @@ static inline void *epc_get_drvdata(struct pci_epc *epc)
 	return dev_get_drvdata(&epc->dev);
 }
 
-static inline int
-pci_epc_register_notifier(struct pci_epc *epc, struct notifier_block *nb)
-{
-	return atomic_notifier_chain_register(&epc->notifier, nb);
-}
-
 struct pci_epc *
 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 		      struct module *owner);
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 009a07147c61..a215dc8ce693 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -17,11 +17,6 @@
 struct pci_epf;
 enum pci_epc_interface_type;
 
-enum pci_notify_event {
-	CORE_INIT,
-	LINK_UP,
-};
-
 enum pci_barno {
 	NO_BAR = -1,
 	BAR_0,
@@ -73,6 +68,16 @@ struct pci_epf_ops {
 };
 
 /**
+ * struct pci_epf_event_ops - Callbacks for capturing the EPC events
+ * @core_init: Callback for the EPC initialization complete event
+ * @link_up: Callback for the EPC link up event
+ */
+struct pci_epc_event_ops {
+	int (*core_init)(struct pci_epf *epf);
+	int (*link_up)(struct pci_epf *epf);
+};
+
+/**
  * struct pci_epf_driver - represents the PCI EPF driver
  * @probe: ops to perform when a new EPF device has been bound to the EPF driver
  * @remove: ops to perform when the binding between the EPF device and EPF
@@ -127,7 +132,6 @@ struct pci_epf_bar {
  * @epf_pf: the physical EPF device to which this virtual EPF device is bound
  * @driver: the EPF driver to which this EPF device is bound
  * @list: to add pci_epf as a list of PCI endpoint functions to pci_epc
- * @nb: notifier block to notify EPF of any EPC events (like linkup)
  * @lock: mutex to protect pci_epf_ops
  * @sec_epc: the secondary EPC device to which this EPF device is bound
  * @sec_epc_list: to add pci_epf as list of PCI endpoint functions to secondary
@@ -139,6 +143,7 @@ struct pci_epf_bar {
  * @is_vf: true - virtual function, false - physical function
  * @vfunction_num_map: bitmap to manage virtual function number
  * @pci_vepf: list of virtual endpoint functions associated with this function
+ * @event_ops: Callbacks for capturing the EPC events
  */
 struct pci_epf {
 	struct device		dev;
@@ -154,7 +159,6 @@ struct pci_epf {
 	struct pci_epf		*epf_pf;
 	struct pci_epf_driver	*driver;
 	struct list_head	list;
-	struct notifier_block   nb;
 	/* mutex to protect against concurrent access of pci_epf_ops */
 	struct mutex		lock;
 
@@ -168,6 +172,7 @@ struct pci_epf {
 	unsigned int		is_vf;
 	unsigned long		vfunction_num_map;
 	struct list_head	pci_vepf;
+	const struct pci_epc_event_ops *event_ops;
 };
 
 /**