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Subject: Re: [PATCH V5 XRT Alveo 04/20] fpga: xrt: xrt-lib driver manager
To:     Tom Rix <trix@redhat.com>, Lizhi Hou <lizhi.hou@xilinx.com>,
        <linux-kernel@vger.kernel.org>
CC:     <linux-fpga@vger.kernel.org>, <maxz@xilinx.com>,
        <sonal.santan@xilinx.com>, <yliu@xilinx.com>,
        <michal.simek@xilinx.com>, <stefanos@xilinx.com>,
        <devicetree@vger.kernel.org>, <mdf@kernel.org>, <robh@kernel.org>,
        Max Zhen <max.zhen@xilinx.com>
References: <20210427205431.23896-1-lizhi.hou@xilinx.com>
 <20210427205431.23896-5-lizhi.hou@xilinx.com>
 <39b50363-2bcf-7988-2fcd-9cc7a0ba931f@redhat.com>
From:   Lizhi Hou <lizhi.hou@xilinx.com>
Message-ID: <b2973478-eb1a-e76b-edd5-16ba7bb8e6bb@xilinx.com>
Date:   Mon, 3 May 2021 14:51:38 -0700
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Hi Tom,


On 05/03/2021 06:06 AM, Tom Rix wrote:
> CAUTION: This message has originated from an External Source. Please 
> use proper judgment and caution when opening attachments, clicking 
> links, or responding to this email.
>
>
> On 4/27/21 1:54 PM, Lizhi Hou wrote:
>> xrt-lib kernel module infrastructure code to register and manage all
>> leaf driver modules.
>>
>> Signed-off-by: Sonal Santan <sonal.santan@xilinx.com>
>> Signed-off-by: Max Zhen <max.zhen@xilinx.com>
>> Signed-off-by: Lizhi Hou <lizhi.hou@xilinx.com>
>> ---
>>   drivers/fpga/xrt/include/subdev_id.h |  38 ++++
>>   drivers/fpga/xrt/include/xdevice.h   | 131 +++++++++++
>>   drivers/fpga/xrt/include/xleaf.h     | 205 +++++++++++++++++
>>   drivers/fpga/xrt/lib/lib-drv.c       | 328 +++++++++++++++++++++++++++
>>   drivers/fpga/xrt/lib/lib-drv.h       |  15 ++
>>   5 files changed, 717 insertions(+)
>>   create mode 100644 drivers/fpga/xrt/include/subdev_id.h
>>   create mode 100644 drivers/fpga/xrt/include/xdevice.h
>>   create mode 100644 drivers/fpga/xrt/include/xleaf.h
>>   create mode 100644 drivers/fpga/xrt/lib/lib-drv.c
>>   create mode 100644 drivers/fpga/xrt/lib/lib-drv.h
>>
>> diff --git a/drivers/fpga/xrt/include/subdev_id.h 
>> b/drivers/fpga/xrt/include/subdev_id.h
>> new file mode 100644
>> index 000000000000..084737c53b88
>> --- /dev/null
>> +++ b/drivers/fpga/xrt/include/subdev_id.h
>> @@ -0,0 +1,38 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (C) 2020-2021 Xilinx, Inc.
>> + *
>> + * Authors:
>> + *   Cheng Zhen <maxz@xilinx.com>
>> + */
>> +
>> +#ifndef _XRT_SUBDEV_ID_H_
>> +#define _XRT_SUBDEV_ID_H_
>> +
>> +/*
>> + * Every subdev driver has an ID for others to refer to it. There 
>> can be multiple number of
>> + * instances of a subdev driver. A <subdev_id, subdev_instance> 
>> tuple is a unique identification
>> + * of a specific instance of a subdev driver.
>> + */
>> +enum xrt_subdev_id {
>> +     XRT_SUBDEV_GRP = 1,
>
> From v4, i meant that only needed to set XRT_SUBDEV_GRP=0
>
> Why did all the values get incremented ?
0 could be an uninitialized id. So we increased the minimum valid ID by 
1 and treated 0 as invalid/uninitialized id.
May I set XRT_SUBDEV_GRP = 1 and remove the following value as a fix here?
or I should add "XRT_SUBDEV_INVALID = 0" ?
>
>> +     XRT_SUBDEV_VSEC = 2,
>> +     XRT_SUBDEV_VSEC_GOLDEN = 3,
>> +     XRT_SUBDEV_DEVCTL = 4,
>> +     XRT_SUBDEV_AXIGATE = 5,
>> +     XRT_SUBDEV_ICAP = 6,
>> +     XRT_SUBDEV_TEST = 7,
>> +     XRT_SUBDEV_MGNT_MAIN = 8,
>> +     XRT_SUBDEV_QSPI = 9,
>> +     XRT_SUBDEV_MAILBOX = 10,
>> +     XRT_SUBDEV_CMC = 11,
>> +     XRT_SUBDEV_CALIB = 12,
>> +     XRT_SUBDEV_CLKFREQ = 13,
>> +     XRT_SUBDEV_CLOCK = 14,
>> +     XRT_SUBDEV_SRSR = 15,
>> +     XRT_SUBDEV_UCS = 16,
>> +     XRT_SUBDEV_NUM = 17, /* Total number of subdevs. */
> Isn't this value now wrong?
No, invalided id 0 is counted.

Thanks,
Lizhi
>> +     XRT_ROOT = -1, /* Special ID for root driver. */
>> +};
>> +
>> +#endif       /* _XRT_SUBDEV_ID_H_ */
>> diff --git a/drivers/fpga/xrt/include/xdevice.h 
>> b/drivers/fpga/xrt/include/xdevice.h
>> new file mode 100644
>> index 000000000000..3afd96989fc5
>> --- /dev/null
>> +++ b/drivers/fpga/xrt/include/xdevice.h
>> @@ -0,0 +1,131 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (C) 2020-2021 Xilinx, Inc.
>> + *
>> + * Authors:
>> + *    Lizhi Hou <lizhi.hou@xilinx.com>
>> + */
>> +
>> +#ifndef _XRT_DEVICE_H_
>> +#define _XRT_DEVICE_H_
>> +
>> +#include <linux/fs.h>
>> +#include <linux/cdev.h>
>> +
>> +#define XRT_MAX_DEVICE_NODES         128
>> +#define XRT_INVALID_DEVICE_INST (XRT_MAX_DEVICE_NODES + 1)
>> +
>> +enum {
>> +     XRT_DEVICE_STATE_NONE = 0,
>> +     XRT_DEVICE_STATE_ADDED
>> +};
>> +
>> +/*
>> + * struct xrt_device - represent an xrt device on xrt bus
>> + *
>> + * dev: generic device interface.
>> + * id: id of the xrt device.
>> + */
>> +struct xrt_device {
>> +     struct device dev;
>> +     u32 subdev_id;
>> +     const char *name;
>> +     u32 instance;
>> +     u32 state;
>> +     u32 num_resources;
>> +     struct resource *resource;
>> +     void *sdev_data;
>> +};
>> +
>> +/*
>> + * If populated by xrt device driver, infra will handle the 
>> mechanics of
>> + * char device (un)registration.
>> + */
>> +enum xrt_dev_file_mode {
>> +     /* Infra create cdev, default file name */
>> +     XRT_DEV_FILE_DEFAULT = 0,
>> +     /* Infra create cdev, need to encode inst num in file name */
>> +     XRT_DEV_FILE_MULTI_INST,
>> +     /* No auto creation of cdev by infra, leaf handles it by itself */
>> +     XRT_DEV_FILE_NO_AUTO,
>> +};
>> +
>> +struct xrt_dev_file_ops {
>> +     const struct file_operations xsf_ops;
>> +     dev_t xsf_dev_t;
>> +     const char *xsf_dev_name;
>> +     enum xrt_dev_file_mode xsf_mode;
>> +};
>> +
>> +/*
>> + * this struct define the endpoints belong to the same xrt device
>> + */
>> +struct xrt_dev_ep_names {
>> +     const char *ep_name;
>> +     const char *compat;
>> +};
>> +
>> +struct xrt_dev_endpoints {
>> +     struct xrt_dev_ep_names *xse_names;
>> +     /* minimum number of endpoints to support the subdevice */
>> +     u32 xse_min_ep;
>> +};
>> +
>> +/*
>> + * struct xrt_driver - represent a xrt device driver
>> + *
>> + * drv: driver model structure.
>> + * id_table: pointer to table of device IDs the driver is interested 
>> in.
>> + *           { } member terminated.
>> + * probe: mandatory callback for device binding.
>> + * remove: callback for device unbinding.
>> + */
>> +struct xrt_driver {
>> +     struct device_driver driver;
>> +     u32 subdev_id;
>> +     struct xrt_dev_file_ops file_ops;
>> +     struct xrt_dev_endpoints *endpoints;
>> +
>> +     /*
>> +      * Subdev driver callbacks populated by subdev driver.
>> +      */
>> +     int (*probe)(struct xrt_device *xrt_dev);
>> +     void (*remove)(struct xrt_device *xrt_dev);
>> +     /*
>> +      * If leaf_call is defined, these are called by other leaf 
>> drivers.
>> +      * Note that root driver may call into leaf_call of a group 
>> driver.
>> +      */
>> +     int (*leaf_call)(struct xrt_device *xrt_dev, u32 cmd, void *arg);
>> +};
>> +
>> +#define to_xrt_dev(d) container_of(d, struct xrt_device, dev)
>> +#define to_xrt_drv(d) container_of(d, struct xrt_driver, driver)
>> +
>> +static inline void *xrt_get_drvdata(const struct xrt_device *xdev)
>> +{
>> +     return dev_get_drvdata(&xdev->dev);
>> +}
>> +
>> +static inline void xrt_set_drvdata(struct xrt_device *xdev, void *data)
>> +{
>> +     dev_set_drvdata(&xdev->dev, data);
>> +}
>> +
>> +static inline void *xrt_get_xdev_data(struct device *dev)
>> +{
>> +     struct xrt_device *xdev = to_xrt_dev(dev);
>> +
>> +     return xdev->sdev_data;
>> +}
>> +
>> +struct xrt_device *
>> +xrt_device_register(struct device *parent, u32 id,
>> +                 struct resource *res, u32 res_num,
>> +                 void *pdata, size_t data_sz);
>> +void xrt_device_unregister(struct xrt_device *xdev);
>> +int xrt_register_driver(struct xrt_driver *drv);
>> +void xrt_unregister_driver(struct xrt_driver *drv);
>> +void *xrt_get_xdev_data(struct device *dev);
>> +struct resource *xrt_get_resource(struct xrt_device *xdev, u32 type, 
>> u32 num);
>> +
>> +#endif /* _XRT_DEVICE_H_ */
>> diff --git a/drivers/fpga/xrt/include/xleaf.h 
>> b/drivers/fpga/xrt/include/xleaf.h
>> new file mode 100644
>> index 000000000000..f065fc766e0f
>> --- /dev/null
>> +++ b/drivers/fpga/xrt/include/xleaf.h
>> @@ -0,0 +1,205 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (C) 2020-2021 Xilinx, Inc.
>> + *
>> + * Authors:
>> + *    Cheng Zhen <maxz@xilinx.com>
>> + *    Sonal Santan <sonal.santan@xilinx.com>
>> + */
>> +
>> +#ifndef _XRT_XLEAF_H_
>> +#define _XRT_XLEAF_H_
>> +
>> +#include <linux/mod_devicetable.h>
>> +#include "xdevice.h"
>> +#include "subdev_id.h"
>> +#include "xroot.h"
>> +#include "events.h"
>> +
>> +/* All subdev drivers should use below common routines to print out 
>> msg. */
>> +#define DEV(xdev)    (&(xdev)->dev)
>> +#define DEV_PDATA(xdev)                                      \
>> +     ((struct xrt_subdev_platdata *)xrt_get_xdev_data(DEV(xdev)))
>> +#define DEV_FILE_OPS(xdev)                           \
>> +     (&(to_xrt_drv((xdev)->dev.driver))->file_ops)
>> +#define FMT_PRT(prt_fn, xdev, fmt, args...)          \
>> +     ({typeof(xdev) (_xdev) = (xdev);                \
>> +     prt_fn(DEV(_xdev), "%s %s: " fmt,               \
>> +     DEV_PDATA(_xdev)->xsp_root_name, __func__, ##args); })
>> +#define xrt_err(xdev, fmt, args...) FMT_PRT(dev_err, xdev, fmt, ##args)
>> +#define xrt_warn(xdev, fmt, args...) FMT_PRT(dev_warn, xdev, fmt, 
>> ##args)
>> +#define xrt_info(xdev, fmt, args...) FMT_PRT(dev_info, xdev, fmt, 
>> ##args)
>> +#define xrt_dbg(xdev, fmt, args...) FMT_PRT(dev_dbg, xdev, fmt, ##args)
>> +
>> +#define XRT_DEFINE_REGMAP_CONFIG(config_name) \
>> +     static const struct regmap_config config_name = {               \
>> +             .reg_bits = 32,                                         \
>> +             .val_bits = 32,                                         \
>> +             .reg_stride = 4,                                        \
>> +             .max_register = 0x1000,                                 \
>> +     }
>> +
>> +enum {
>> +     /* Starting cmd for common leaf cmd implemented by all leaves. */
>> +     XRT_XLEAF_COMMON_BASE = 0,
>> +     /* Starting cmd for leaves' specific leaf cmds. */
>> +     XRT_XLEAF_CUSTOM_BASE = 64,
>> +};
>> +
>> +enum xrt_xleaf_common_leaf_cmd {
>> +     XRT_XLEAF_EVENT = XRT_XLEAF_COMMON_BASE,
>> +};
>> +
>> +/*
>> + * Partially initialized by the parent driver, then, passed in as 
>> subdev driver's
>> + * platform data when creating subdev driver instance by calling 
>> platform
>> + * device register API (xrt_device_register_data() or the likes).
>> + *
>> + * Once device register API returns, platform driver framework makes 
>> a copy of
>> + * this buffer and maintains its life cycle. The content of the 
>> buffer is
>> + * completely owned by subdev driver.
>> + *
>> + * Thus, parent driver should be very careful when it touches this 
>> buffer
>> + * again once it's handed over to subdev driver. And the data structure
>> + * should not contain pointers pointing to buffers that is managed by
>> + * other or parent drivers since it could have been freed before 
>> platform
>> + * data buffer is freed by platform driver framework.
>> + */
>> +struct xrt_subdev_platdata {
>> +     /*
>> +      * Per driver instance callback. The xdev points to the instance.
>> +      * Should always be defined for subdev driver to get service 
>> from root.
>> +      */
>> +     xrt_subdev_root_cb_t xsp_root_cb;
>> +     void *xsp_root_cb_arg;
>> +
>> +     /* Something to associate w/ root for msg printing. */
>> +     const char *xsp_root_name;
>> +
>> +     /*
>> +      * Char dev support for this subdev instance.
>> +      * Initialized by subdev driver.
>> +      */
>> +     struct cdev xsp_cdev;
>> +     struct device *xsp_sysdev;
>> +     struct mutex xsp_devnode_lock; /* devnode lock */
>> +     struct completion xsp_devnode_comp;
>> +     int xsp_devnode_ref;
>> +     bool xsp_devnode_online;
>> +     bool xsp_devnode_excl;
>> +
>> +     /*
>> +      * Subdev driver specific init data. The buffer should be embedded
>> +      * in this data structure buffer after dtb, so that it can be 
>> freed
>> +      * together with platform data.
>> +      */
>> +     loff_t xsp_priv_off; /* Offset into this platform data buffer. */
>> +     size_t xsp_priv_len;
>> +
>> +     /*
>> +      * Populated by parent driver to describe the device tree for
>> +      * the subdev driver to handle. Should always be last one since 
>> it's
>> +      * of variable length.
>> +      */
>> +     bool xsp_dtb_valid;
>> +     char xsp_dtb[0];
>> +};
>> +
>> +struct subdev_match_arg {
>> +     enum xrt_subdev_id id;
>> +     int instance;
>> +};
>> +
>> +bool xleaf_has_endpoint(struct xrt_device *xdev, const char 
>> *endpoint_name);
>> +struct xrt_device *xleaf_get_leaf(struct xrt_device *xdev,
>> +                               xrt_subdev_match_t cb, void *arg);
>> +
>> +static inline bool subdev_match(enum xrt_subdev_id id, struct 
>> xrt_device *xdev, void *arg)
>> +{
>> +     const struct subdev_match_arg *a = (struct subdev_match_arg *)arg;
>> +     int instance = a->instance;
>> +
>> +     if (id != a->id)
>> +             return false;
>> +     if (instance != xdev->instance && instance != 
>> XRT_INVALID_DEVICE_INST)
>> +             return false;
>> +     return true;
>> +}
>> +
>> +static inline bool xrt_subdev_match_epname(enum xrt_subdev_id id,
>> +                                        struct xrt_device *xdev, 
>> void *arg)
>> +{
>> +     return xleaf_has_endpoint(xdev, arg);
>> +}
>> +
>> +static inline struct xrt_device *
>> +xleaf_get_leaf_by_id(struct xrt_device *xdev,
>> +                  enum xrt_subdev_id id, int instance)
>> +{
>> +     struct subdev_match_arg arg = { id, instance };
>> +
>> +     return xleaf_get_leaf(xdev, subdev_match, &arg);
>> +}
>> +
>> +static inline struct xrt_device *
>> +xleaf_get_leaf_by_epname(struct xrt_device *xdev, const char *name)
>> +{
>> +     return xleaf_get_leaf(xdev, xrt_subdev_match_epname, (void 
>> *)name);
>> +}
>> +
>> +static inline int xleaf_call(struct xrt_device *tgt, u32 cmd, void 
>> *arg)
>> +{
>> +     return (to_xrt_drv(tgt->dev.driver)->leaf_call)(tgt, cmd, arg);
>> +}
>> +
>> +int xleaf_broadcast_event(struct xrt_device *xdev, enum xrt_events 
>> evt, bool async);
>> +int xleaf_create_group(struct xrt_device *xdev, char *dtb);
>> +int xleaf_destroy_group(struct xrt_device *xdev, int instance);
>> +void xleaf_get_root_res(struct xrt_device *xdev, u32 region_id, 
>> struct resource **res);
>> +void xleaf_get_root_id(struct xrt_device *xdev, unsigned short 
>> *vendor, unsigned short *device,
>> +                    unsigned short *subvendor, unsigned short 
>> *subdevice);
>> +void xleaf_hot_reset(struct xrt_device *xdev);
>> +int xleaf_put_leaf(struct xrt_device *xdev, struct xrt_device *leaf);
>> +struct device *xleaf_register_hwmon(struct xrt_device *xdev, const 
>> char *name, void *drvdata,
>> +                                 const struct attribute_group **grps);
>> +void xleaf_unregister_hwmon(struct xrt_device *xdev, struct device 
>> *hwmon);
>> +int xleaf_wait_for_group_bringup(struct xrt_device *xdev);
>> +
>> +/*
>> + * Character device helper APIs for use by leaf drivers
>> + */
>> +static inline bool xleaf_devnode_enabled(struct xrt_device *xdev)
>> +{
>> +     return DEV_FILE_OPS(xdev)->xsf_ops.open;
>> +}
>> +
>> +int xleaf_devnode_create(struct xrt_device *xdev,
>> +                      const char *file_name, const char *inst_name);
>> +void xleaf_devnode_destroy(struct xrt_device *xdev);
>> +
>> +struct xrt_device *xleaf_devnode_open_excl(struct inode *inode);
>> +struct xrt_device *xleaf_devnode_open(struct inode *inode);
>> +void xleaf_devnode_close(struct inode *inode);
>> +
>> +/* Module's init/fini routines for leaf driver in xrt-lib module */
>> +#define XRT_LEAF_INIT_FINI_FUNC(name) \
>> +void name##_leaf_init_fini(bool 
>> init)                                        \
>> +{                                                                    \
>> +     if (init)                                                       \
>> + xrt_register_driver(&xrt_##name##_driver);              \
>> + else \
>> + xrt_unregister_driver(&xrt_##name##_driver);            \
>> +}
>> +
>> +/* Module's init/fini routines for leaf driver in xrt-lib module */
>> +void group_leaf_init_fini(bool init);
>> +void vsec_leaf_init_fini(bool init);
>> +void devctl_leaf_init_fini(bool init);
>> +void axigate_leaf_init_fini(bool init);
>> +void icap_leaf_init_fini(bool init);
>> +void calib_leaf_init_fini(bool init);
>> +void clkfreq_leaf_init_fini(bool init);
>> +void clock_leaf_init_fini(bool init);
>> +void ucs_leaf_init_fini(bool init);
>> +
>> +#endif       /* _XRT_LEAF_H_ */
>> diff --git a/drivers/fpga/xrt/lib/lib-drv.c 
>> b/drivers/fpga/xrt/lib/lib-drv.c
>> new file mode 100644
>> index 000000000000..ba4ac4930823
>> --- /dev/null
>> +++ b/drivers/fpga/xrt/lib/lib-drv.c
>> @@ -0,0 +1,328 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2020-2021 Xilinx, Inc.
>> + *
>> + * Authors:
>> + *   Cheng Zhen <maxz@xilinx.com>
>> + *   Lizhi Hou <lizhi.hou@xilinx.com>
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/vmalloc.h>
>> +#include <linux/slab.h>
>> +#include "xleaf.h"
>> +#include "xroot.h"
>> +#include "lib-drv.h"
>> +
>> +#define XRT_IPLIB_MODULE_NAME                "xrt-lib"
>> +#define XRT_IPLIB_MODULE_VERSION     "4.0.0"
>> +#define XRT_DRVNAME(drv)             ((drv)->driver.name)
>> +
>> +#define XRT_SUBDEV_ID_SHIFT          16
>> +#define XRT_SUBDEV_ID_MASK           ((1 << XRT_SUBDEV_ID_SHIFT) - 1)
>> +
>> +struct xrt_find_drv_data {
>> +     enum xrt_subdev_id id;
>> +     struct xrt_driver *xdrv;
>> +};
>> +
>> +struct class *xrt_class;
>> +static DEFINE_IDA(xrt_device_ida);
>> +
>> +static inline u32 xrt_instance_to_id(enum xrt_subdev_id id, u32 
>> instance)
>> +{
>> +     return (id << XRT_SUBDEV_ID_SHIFT) | instance;
>> +}
>> +
>> +static inline u32 xrt_id_to_instance(u32 id)
>> +{
>> +     return (id & XRT_SUBDEV_ID_MASK);
>> +}
>> +
>> +static int xrt_bus_match(struct device *dev, struct device_driver *drv)
>> +{
>> +     struct xrt_device *xdev = to_xrt_dev(dev);
>> +     struct xrt_driver *xdrv = to_xrt_drv(drv);
>> +
>> +     if (xdev->subdev_id == xdrv->subdev_id)
>> +             return 1;
>> +
>> +     return 0;
>> +}
>> +
>> +static int xrt_bus_probe(struct device *dev)
>> +{
>> +     struct xrt_driver *xdrv = to_xrt_drv(dev->driver);
>> +     struct xrt_device *xdev = to_xrt_dev(dev);
>> +
>> +     return xdrv->probe(xdev);
>> +}
>> +
>> +static int xrt_bus_remove(struct device *dev)
>> +{
>> +     struct xrt_driver *xdrv = to_xrt_drv(dev->driver);
>> +     struct xrt_device *xdev = to_xrt_dev(dev);
>> +
>> +     if (xdrv->remove)
>> +             xdrv->remove(xdev);
>> +
>> +     return 0;
>> +}
>> +
>> +struct bus_type xrt_bus_type = {
>> +     .name           = "xrt",
>> +     .match          = xrt_bus_match,
>> +     .probe          = xrt_bus_probe,
>> +     .remove         = xrt_bus_remove,
>> +};
>> +
>> +int xrt_register_driver(struct xrt_driver *drv)
>> +{
>> +     const char *drvname = XRT_DRVNAME(drv);
>> +     int rc = 0;
>> +
>> +     /* Initialize dev_t for char dev node. */
>> +     if (drv->file_ops.xsf_ops.open) {
>> +             rc = alloc_chrdev_region(&drv->file_ops.xsf_dev_t, 0,
>> +                                      XRT_MAX_DEVICE_NODES, drvname);
>> +             if (rc) {
>> +                     pr_err("failed to alloc dev minor for %s: 
>> %d\n", drvname, rc);
>> +                     return rc;
>> +             }
>> +     } else {
>> +             drv->file_ops.xsf_dev_t = (dev_t)-1;
>> +     }
>> +
>> +     drv->driver.owner = THIS_MODULE;
>> +     drv->driver.bus = &xrt_bus_type;
>> +
>> +     rc = driver_register(&drv->driver);
>> +     if (rc) {
>> +             pr_err("register %s xrt driver failed\n", drvname);
>> +             if (drv->file_ops.xsf_dev_t != (dev_t)-1) {
>> + unregister_chrdev_region(drv->file_ops.xsf_dev_t,
>> + XRT_MAX_DEVICE_NODES);
>> +             }
>> +             return rc;
>> +     }
>> +
>> +     pr_info("%s registered successfully\n", drvname);
>> +
>> +     return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(xrt_register_driver);
>> +
>> +void xrt_unregister_driver(struct xrt_driver *drv)
>> +{
>> +     driver_unregister(&drv->driver);
>> +
>> +     if (drv->file_ops.xsf_dev_t != (dev_t)-1)
>> + unregister_chrdev_region(drv->file_ops.xsf_dev_t, 
>> XRT_MAX_DEVICE_NODES);
>> +
>> +     pr_info("%s unregistered successfully\n", XRT_DRVNAME(drv));
>> +}
>> +EXPORT_SYMBOL_GPL(xrt_unregister_driver);
>> +
>> +static int __find_driver(struct device_driver *drv, void *_data)
>> +{
>> +     struct xrt_driver *xdrv = to_xrt_drv(drv);
>> +     struct xrt_find_drv_data *data = _data;
>> +
>> +     if (xdrv->subdev_id == data->id) {
>> +             data->xdrv = xdrv;
>> +             return 1;
>> +     }
>> +
>> +     return 0;
>> +}
>> +
>> +const char *xrt_drv_name(enum xrt_subdev_id id)
>> +{
>> +     struct xrt_find_drv_data data = { 0 };
>> +
>> +     data.id = id;
>> +     bus_for_each_drv(&xrt_bus_type, NULL, &data, __find_driver);
>> +
>> +     if (data.xdrv)
>> +             return XRT_DRVNAME(data.xdrv);
>> +
>> +     return NULL;
>> +}
>> +
>> +static int xrt_drv_get_instance(enum xrt_subdev_id id)
>> +{
>> +     int ret;
>> +
>> +     ret = ida_alloc_range(&xrt_device_ida, xrt_instance_to_id(id, 0),
>> +                           xrt_instance_to_id(id, 
>> XRT_MAX_DEVICE_NODES),
>> +                           GFP_KERNEL);
>> +     if (ret < 0)
>> +             return ret;
>> +
>> +     return xrt_id_to_instance((u32)ret);
>> +}
>> +
>> +static void xrt_drv_put_instance(enum xrt_subdev_id id, int instance)
>> +{
>> +     ida_free(&xrt_device_ida, xrt_instance_to_id(id, instance));
>> +}
>> +
>> +struct xrt_dev_endpoints *xrt_drv_get_endpoints(enum xrt_subdev_id id)
>> +{
>> +     struct xrt_find_drv_data data = { 0 };
>> +
>> +     data.id = id;
>> +     bus_for_each_drv(&xrt_bus_type, NULL, &data, __find_driver);
>> +
>> +     if (data.xdrv)
>> +             return data.xdrv->endpoints;
>> +
>> +     return NULL;
>> +}
>> +
>> +static void xrt_device_release(struct device *dev)
>> +{
>> +     struct xrt_device *xdev = container_of(dev, struct xrt_device, 
>> dev);
>> +
>> +     kfree(xdev);
>> +}
>> +
>> +void xrt_device_unregister(struct xrt_device *xdev)
>> +{
>> +     if (xdev->state == XRT_DEVICE_STATE_ADDED)
>> +             device_del(&xdev->dev);
>> +
>> +     vfree(xdev->sdev_data);
>> +     kfree(xdev->resource);
>> +
>> +     if (xdev->instance != XRT_INVALID_DEVICE_INST)
>> +             xrt_drv_put_instance(xdev->subdev_id, xdev->instance);
>> +
>> +     if (xdev->dev.release == xrt_device_release)
>> +             put_device(&xdev->dev);
>> +}
>> +
>> +struct xrt_device *
>> +xrt_device_register(struct device *parent, u32 id,
>> +                 struct resource *res, u32 res_num,
>> +                 void *pdata, size_t data_sz)
>> +{
>> +     struct xrt_device *xdev = NULL;
>> +     int ret;
>> +
>> +     xdev = kzalloc(sizeof(*xdev), GFP_KERNEL);
>> +     if (!xdev)
>> +             return NULL;
>> +     xdev->instance = XRT_INVALID_DEVICE_INST;
>> +
>> +     /* Obtain dev instance number. */
>> +     ret = xrt_drv_get_instance(id);
>> +     if (ret < 0) {
>> +             dev_err(parent, "failed get instance, ret %d", ret);
>> +             goto fail;
>> +     }
>> +
>> +     xdev->instance = ret;
>> +     xdev->name = xrt_drv_name(id);
>> +     xdev->subdev_id = id;
>> +     device_initialize(&xdev->dev);
>> +     xdev->dev.release = xrt_device_release;
>> +     xdev->dev.parent = parent;
>> +
>> +     xdev->dev.bus = &xrt_bus_type;
>> +     dev_set_name(&xdev->dev, "%s.%d", xdev->name, xdev->instance);
>> +
>> +     xdev->num_resources = res_num;
>> +     xdev->resource = kmemdup(res, sizeof(*res) * res_num, GFP_KERNEL);
>> +     if (!xdev->resource)
>> +             goto fail;
>> +
>> +     xdev->sdev_data = vzalloc(data_sz);
>> +     if (!xdev->sdev_data)
>> +             goto fail;
>> +
>> +     memcpy(xdev->sdev_data, pdata, data_sz);
>> +
>> +     ret = device_add(&xdev->dev);
>> +     if (ret) {
>> +             dev_err(parent, "failed add device, ret %d", ret);
>> +             goto fail;
>> +     }
>> +     xdev->state = XRT_DEVICE_STATE_ADDED;
>> +
>> +     return xdev;
>> +
>> +fail:
>> +     xrt_device_unregister(xdev);
>> +     kfree(xdev);
>> +
>> +     return NULL;
>> +}
>> +
>> +struct resource *xrt_get_resource(struct xrt_device *xdev, u32 type, 
>> u32 num)
>> +{
>> +     u32 i;
>> +
>> +     for (i = 0; i < xdev->num_resources; i++) {
>> +             struct resource *r = &xdev->resource[i];
>> +
>> +             if (type == resource_type(r) && num-- == 0)
>> +                     return r;
>> +     }
>> +     return NULL;
>> +}
>> +
>> +/*
>> + * Leaf driver's module init/fini callbacks. This is not a open 
>> infrastructure for dynamic
>> + * plugging in drivers. All drivers should be statically added.
>
> ok
>
> Tom
>
>> + */
>> +static void (*leaf_init_fini_cbs[])(bool) = {
>> +     group_leaf_init_fini,
>> +     vsec_leaf_init_fini,
>> +     devctl_leaf_init_fini,
>> +     axigate_leaf_init_fini,
>> +     icap_leaf_init_fini,
>> +     calib_leaf_init_fini,
>> +     clkfreq_leaf_init_fini,
>> +     clock_leaf_init_fini,
>> +     ucs_leaf_init_fini,
>> +};
>> +
>> +static __init int xrt_lib_init(void)
>> +{
>> +     int ret;
>> +     int i;
>> +
>> +     ret = bus_register(&xrt_bus_type);
>> +     if (ret)
>> +             return ret;
>> +
>> +     xrt_class = class_create(THIS_MODULE, XRT_IPLIB_MODULE_NAME);
>> +     if (IS_ERR(xrt_class)) {
>> +             bus_unregister(&xrt_bus_type);
>> +             return PTR_ERR(xrt_class);
>> +     }
>> +
>> +     for (i = 0; i < ARRAY_SIZE(leaf_init_fini_cbs); i++)
>> +             leaf_init_fini_cbs[i](true);
>> +     return 0;
>> +}
>> +
>> +static __exit void xrt_lib_fini(void)
>> +{
>> +     int i;
>> +
>> +     for (i = 0; i < ARRAY_SIZE(leaf_init_fini_cbs); i++)
>> +             leaf_init_fini_cbs[i](false);
>> +
>> +     class_destroy(xrt_class);
>> +     bus_unregister(&xrt_bus_type);
>> +}
>> +
>> +module_init(xrt_lib_init);
>> +module_exit(xrt_lib_fini);
>> +
>> +MODULE_VERSION(XRT_IPLIB_MODULE_VERSION);
>> +MODULE_AUTHOR("XRT Team <runtime@xilinx.com>");
>> +MODULE_DESCRIPTION("Xilinx Alveo IP Lib driver");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/fpga/xrt/lib/lib-drv.h 
>> b/drivers/fpga/xrt/lib/lib-drv.h
>> new file mode 100644
>> index 000000000000..514f904c81c0
>> --- /dev/null
>> +++ b/drivers/fpga/xrt/lib/lib-drv.h
>> @@ -0,0 +1,15 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (C) 2020-2021 Xilinx, Inc.
>> + *
>> + * Authors:
>> + *   Cheng Zhen <maxz@xilinx.com>
>> + */
>> +
>> +#ifndef _LIB_DRV_H_
>> +#define _LIB_DRV_H_
>> +
>> +const char *xrt_drv_name(enum xrt_subdev_id id);
>> +struct xrt_dev_endpoints *xrt_drv_get_endpoints(enum xrt_subdev_id id);
>> +
>> +#endif       /* _LIB_DRV_H_ */
>