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Subject[PATCH 14/22] misc: xlink-pcie: Add asynchronous event notification support for XLink
Date
From: Srikanth Thokala <srikanth.thokala@intel.com>

Add support to notify XLink layer upon PCIe link UP/DOWN events

Reviewed-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Srikanth Thokala <srikanth.thokala@intel.com>
---
drivers/misc/xlink-pcie/common/core.h | 3 ++
drivers/misc/xlink-pcie/common/interface.c | 17 ++++++++++
drivers/misc/xlink-pcie/local_host/core.c | 11 +++++++
drivers/misc/xlink-pcie/remote_host/main.c | 3 ++
drivers/misc/xlink-pcie/remote_host/pci.c | 36 ++++++++++++++++++++++
drivers/misc/xlink-pcie/remote_host/pci.h | 3 ++
include/linux/xlink_drv_inf.h | 12 ++++++++
7 files changed, 85 insertions(+)

diff --git a/drivers/misc/xlink-pcie/common/core.h b/drivers/misc/xlink-pcie/common/core.h
index eec8566c19d9..34b6c268aac5 100644
--- a/drivers/misc/xlink-pcie/common/core.h
+++ b/drivers/misc/xlink-pcie/common/core.h
@@ -241,4 +241,7 @@ int intel_xpcie_pci_connect_device(u32 id);
int intel_xpcie_pci_read(u32 id, void *data, size_t *size, u32 timeout);
int intel_xpcie_pci_write(u32 id, void *data, size_t *size, u32 timeout);
int intel_xpcie_pci_reset_device(u32 id);
+int intel_xpcie_pci_register_device_event(u32 sw_device_id,
+ xlink_device_event event_notif_fn);
+int intel_xpcie_pci_unregister_device_event(u32 sw_device_id);
#endif /* XPCIE_CORE_HEADER_ */
diff --git a/drivers/misc/xlink-pcie/common/interface.c b/drivers/misc/xlink-pcie/common/interface.c
index 56c1d9ed9d8f..4ad291ff97c8 100644
--- a/drivers/misc/xlink-pcie/common/interface.c
+++ b/drivers/misc/xlink-pcie/common/interface.c
@@ -107,3 +107,20 @@ int xlink_pcie_reset_device(u32 sw_device_id)
return intel_xpcie_pci_reset_device(sw_device_id);
}
EXPORT_SYMBOL(xlink_pcie_reset_device);
+
+int xlink_pcie_register_device_event(u32 sw_device_id,
+ xlink_device_event event_notif_fn)
+{
+ if (!event_notif_fn)
+ return -EINVAL;
+
+ return intel_xpcie_pci_register_device_event(sw_device_id,
+ event_notif_fn);
+}
+EXPORT_SYMBOL(xlink_pcie_register_device_event);
+
+int xlink_pcie_unregister_device_event(u32 sw_device_id)
+{
+ return intel_xpcie_pci_unregister_device_event(sw_device_id);
+}
+EXPORT_SYMBOL(xlink_pcie_unregister_device_event);
diff --git a/drivers/misc/xlink-pcie/local_host/core.c b/drivers/misc/xlink-pcie/local_host/core.c
index 0f83b5ffc4f2..628c383113ca 100644
--- a/drivers/misc/xlink-pcie/local_host/core.c
+++ b/drivers/misc/xlink-pcie/local_host/core.c
@@ -892,3 +892,14 @@ int intel_xpcie_pci_reset_device(u32 id)
{
return 0;
}
+
+int intel_xpcie_pci_register_device_event(u32 sw_device_id,
+ xlink_device_event event_notif_fn)
+{
+ return 0;
+}
+
+int intel_xpcie_pci_unregister_device_event(u32 sw_device_id)
+{
+ return 0;
+}
diff --git a/drivers/misc/xlink-pcie/remote_host/main.c b/drivers/misc/xlink-pcie/remote_host/main.c
index 810da1509418..421635321f1b 100644
--- a/drivers/misc/xlink-pcie/remote_host/main.c
+++ b/drivers/misc/xlink-pcie/remote_host/main.c
@@ -55,6 +55,8 @@ static int intel_xpcie_probe(struct pci_dev *pdev,
if (new_device)
intel_xpcie_list_add_device(xdev);

+ intel_xpcie_pci_notify_event(xdev, NOTIFY_DEVICE_CONNECTED);
+
return ret;
}

@@ -64,6 +66,7 @@ static void intel_xpcie_remove(struct pci_dev *pdev)

if (xdev) {
intel_xpcie_pci_cleanup(xdev);
+ intel_xpcie_pci_notify_event(xdev, NOTIFY_DEVICE_DISCONNECTED);
intel_xpcie_remove_device(xdev);
}
}
diff --git a/drivers/misc/xlink-pcie/remote_host/pci.c b/drivers/misc/xlink-pcie/remote_host/pci.c
index f92a78f41324..0046bff5f604 100644
--- a/drivers/misc/xlink-pcie/remote_host/pci.c
+++ b/drivers/misc/xlink-pcie/remote_host/pci.c
@@ -8,6 +8,7 @@
****************************************************************************/

#include <linux/mutex.h>
+#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
@@ -487,3 +488,38 @@ int intel_xpcie_pci_reset_device(u32 id)

return intel_xpcie_pci_prepare_dev_reset(xdev, true);
}
+
+int intel_xpcie_pci_register_device_event(u32 sw_device_id,
+ xlink_device_event event_notif_fn)
+{
+ struct xpcie_dev *xdev = intel_xpcie_get_device_by_id(sw_device_id);
+
+ if (!xdev)
+ return -ENOMEM;
+
+ xdev->event_fn = event_notif_fn;
+
+ return 0;
+}
+
+int intel_xpcie_pci_unregister_device_event(u32 sw_device_id)
+{
+ struct xpcie_dev *xdev = intel_xpcie_get_device_by_id(sw_device_id);
+
+ if (!xdev)
+ return -ENOMEM;
+
+ xdev->event_fn = NULL;
+
+ return 0;
+}
+
+void intel_xpcie_pci_notify_event(struct xpcie_dev *xdev,
+ enum xlink_device_event_type event_type)
+{
+ if (event_type >= NUM_EVENT_TYPE)
+ return;
+
+ if (xdev->event_fn)
+ xdev->event_fn(xdev->devid, event_type);
+}
diff --git a/drivers/misc/xlink-pcie/remote_host/pci.h b/drivers/misc/xlink-pcie/remote_host/pci.h
index 72de3701f83a..a05dedf36a12 100644
--- a/drivers/misc/xlink-pcie/remote_host/pci.h
+++ b/drivers/misc/xlink-pcie/remote_host/pci.h
@@ -38,6 +38,7 @@ struct xpcie_dev {
irq_handler_t core_irq_callback;

struct xpcie xpcie;
+ xlink_device_event event_fn;
};

static inline struct device *xpcie_to_dev(struct xpcie *xpcie)
@@ -60,5 +61,7 @@ struct xpcie_dev *intel_xpcie_create_device(u32 sw_device_id,
void intel_xpcie_remove_device(struct xpcie_dev *xdev);
void intel_xpcie_list_add_device(struct xpcie_dev *xdev);
void intel_xpcie_list_del_device(struct xpcie_dev *xdev);
+void intel_xpcie_pci_notify_event(struct xpcie_dev *xdev,
+ enum xlink_device_event_type event_type);

#endif /* XPCIE_PCI_HEADER_ */
diff --git a/include/linux/xlink_drv_inf.h b/include/linux/xlink_drv_inf.h
index ffe8f4c253e6..5ca0ae1ae2e3 100644
--- a/include/linux/xlink_drv_inf.h
+++ b/include/linux/xlink_drv_inf.h
@@ -44,6 +44,15 @@ enum _xlink_device_status {
_XLINK_DEV_READY
};

+enum xlink_device_event_type {
+ NOTIFY_DEVICE_DISCONNECTED,
+ NOTIFY_DEVICE_CONNECTED,
+ NUM_EVENT_TYPE
+};
+
+typedef int (*xlink_device_event)(u32 sw_device_id,
+ enum xlink_device_event_type event_type);
+
int xlink_pcie_get_device_list(u32 *sw_device_id_list,
u32 *num_devices);
int xlink_pcie_get_device_name(u32 sw_device_id, char *device_name,
@@ -57,4 +66,7 @@ int xlink_pcie_read(u32 sw_device_id, void *data, size_t *const size,
int xlink_pcie_write(u32 sw_device_id, void *data, size_t *const size,
u32 timeout);
int xlink_pcie_reset_device(u32 sw_device_id);
+int xlink_pcie_register_device_event(u32 sw_device_id,
+ xlink_device_event event_notif_fn);
+int xlink_pcie_unregister_device_event(u32 sw_device_id);
#endif
--
2.17.1
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