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| author | Wu Hao <hao.wu@intel.com> | 2018-06-30 08:53:15 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-15 13:55:45 +0200 |
| commit | 5d56e117001996766c3dab5767663b0c43b76639 (patch) | |
| tree | 90ca25fdad1af397732654f312f633ed8655fd33 /drivers/fpga | |
| parent | b16c5147dc3b1a03405f58f6864b56f29ab7aaf9 (diff) | |
| download | linux-5d56e117001996766c3dab5767663b0c43b76639.tar.gz linux-5d56e117001996766c3dab5767663b0c43b76639.tar.bz2 linux-5d56e117001996766c3dab5767663b0c43b76639.zip | |
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>
Diffstat (limited to 'drivers/fpga')
| -rw-r--r-- | drivers/fpga/dfl.c | 32 | ||||
| -rw-r--r-- | drivers/fpga/dfl.h | 21 |
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 */ |