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fpga: dfl: add dfl_fpga_cdev_find_port

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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 <[email protected]>
Signed-off-by: Enno Luebbers <[email protected]>
Signed-off-by: Shiva Rao <[email protected]>
Signed-off-by: Christopher Rauer <[email protected]>
Signed-off-by: Xiao Guangrong <[email protected]>
Signed-off-by: Wu Hao <[email protected]>
Acked-by: Alan Tull <[email protected]>
Acked-by: Moritz Fischer <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Wu Hao 2018-06-30 08:53:15 +08:00 • committed by Greg Kroah-Hartman
commit 5d56e11700
2 changed files with 53 additions and 0 deletions
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32
drivers/fpga/dfl.c
View file

@ -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;

21
drivers/fpga/dfl.h
View file

@ -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 */