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Commit 5d56e117 authored by Wu Hao's avatar Wu Hao Committed by Greg Kroah-Hartman
Browse files

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: default avatarTim Whisonant <tim.whisonant@intel.com>
Signed-off-by: default avatarEnno Luebbers <enno.luebbers@intel.com>
Signed-off-by: default avatarShiva Rao <shiva.rao@intel.com>
Signed-off-by: default avatarChristopher Rauer <christopher.rauer@intel.com>
Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarWu Hao <hao.wu@intel.com>
Acked-by: default avatarAlan Tull <atull@kernel.org>
Acked-by: default avatarMoritz Fischer <mdf@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b16c5147

drivers/fpga/dfl.c

+32 −0
Original line number Diff line number Diff line
@@ -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;

drivers/fpga/dfl.h

+21 −0
Original line number Diff line number Diff line
@@ -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 */