fpga: dfl: add dfl_fpga_cdev_find_port

For feature devices, we need a method to find the port dedicated
to the device. This patch adds a function dfl_fpga_cdev_find_port
for this purpose. e.g. FPGA Management Engine (FME) Partial
Reconfiguration sub feature, it uses this function to find
dedicated port on the device for PR function implementation.

Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>
Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
Signed-off-by: Shiva Rao <shiva.rao@intel.com>
Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 53 insertions, 0 deletions

diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index b56933c64371..68e0b45617b2 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -813,6 +813,38 @@ void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev)
 }
 EXPORT_SYMBOL_GPL(dfl_fpga_feature_devs_remove);
 
+/**
+ * __dfl_fpga_cdev_find_port - find a port under given container device
+ *
+ * @cdev: container device
+ * @data: data passed to match function
+ * @match: match function used to find specific port from the port device list
+ *
+ * Find a port device under container device. This function needs to be
+ * invoked with lock held.
+ *
+ * Return: pointer to port's platform device if successful, NULL otherwise.
+ *
+ * NOTE: you will need to drop the device reference with put_device() after use.
+ */
+struct platform_device *
+__dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
+                          int (*match)(struct platform_device *, void *))
+{
+        struct dfl_feature_platform_data *pdata;
+        struct platform_device *port_dev;
+
+        list_for_each_entry(pdata, &cdev->port_dev_list, node) {
+                port_dev = pdata->dev;
+
+                if (match(port_dev, data) && get_device(&port_dev->dev))
+                        return port_dev;
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(__dfl_fpga_cdev_find_port);
+
 static int __init dfl_fpga_init(void)
 {
         int ret;
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 66c2ade5a06b..b4f65250a29c 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -284,4 +284,25 @@ struct dfl_fpga_cdev *
 dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info);
 void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev);
 
+/*
+ * need to drop the device reference with put_device() after use port platform
+ * device returned by __dfl_fpga_cdev_find_port and dfl_fpga_cdev_find_port
+ * functions.
+ */
+struct platform_device *
+__dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
+                          int (*match)(struct platform_device *, void *));
+
+static inline struct platform_device *
+dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
+                        int (*match)(struct platform_device *, void *))
+{
+        struct platform_device *pdev;
+
+        mutex_lock(&cdev->lock);
+        pdev = __dfl_fpga_cdev_find_port(cdev, data, match);
+        mutex_unlock(&cdev->lock);
+
+        return pdev;
+}
 #endif /* __FPGA_DFL_H */