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Subject[PATCH V3 XRT Alveo Infrastructure 5/8] fpga: xrt: xrt bus and device
Date
xrt-lib kernel module infrastructure code to add xrt_bus_type, xrt_driver
and xrt_device

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/lib/lib-drv.c | 192 +++++++++++++++++++++++++++++++++
include/linux/xrt/xdevice.h | 128 ++++++++++++++++++++++
2 files changed, 320 insertions(+)
create mode 100644 include/linux/xrt/xdevice.h

diff --git a/drivers/fpga/xrt/lib/lib-drv.c b/drivers/fpga/xrt/lib/lib-drv.c
index d4597cd4767f..3ad02a7c2aac 100644
--- a/drivers/fpga/xrt/lib/lib-drv.c
+++ b/drivers/fpga/xrt/lib/lib-drv.c
@@ -11,10 +11,195 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/of_device.h>
+#include <linux/xrt/xdevice.h>
#include "lib-drv.h"

static int xrt_bus_ovcs_id;

+#define XRT_DRVNAME(drv) ((drv)->driver.name)
+
+static DEFINE_IDA(xrt_device_ida);
+
+static int xrt_bus_match(struct device *dev, struct device_driver *drv)
+{
+ if (of_driver_match_device(dev, drv))
+ 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 void 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);
+}
+
+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.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 xrt_dev_get_instance(void)
+{
+ int ret;
+
+ ret = ida_alloc_range(&xrt_device_ida, 0, 0x7fffffff, GFP_KERNEL);
+ if (ret < 0)
+ return ret;
+
+ return ret;
+}
+
+static void xrt_dev_put_instance(int instance)
+{
+ ida_free(&xrt_device_ida, instance);
+}
+
+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_dev_put_instance(xdev->instance);
+
+ if (xdev->dev.of_node)
+ of_node_put(xdev->dev.of_node);
+
+ if (xdev->dev.release == xrt_device_release)
+ put_device(&xdev->dev);
+}
+
+struct xrt_device *
+xrt_device_register(struct device *parent, struct device_node *dn,
+ 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_dev_get_instance();
+ if (ret < 0) {
+ dev_err(parent, "failed get instance, ret %d", ret);
+ goto fail;
+ }
+
+ xdev->instance = ret;
+ xdev->name = dn->full_name;
+ 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);
+
+ if (res_num > 0) {
+ xdev->num_resources = res_num;
+ xdev->resource = kmemdup(res, sizeof(*res) * res_num, GFP_KERNEL);
+ if (!xdev->resource)
+ goto fail;
+ }
+
+ if (data_sz > 0) {
+ 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;
+ xdev->dev.of_node = of_node_get(dn);
+
+ return xdev;
+
+fail:
+ xrt_device_unregister(xdev);
+ kfree(xdev);
+
+ return NULL;
+}
+
static __init int xrt_lib_init(void)
{
int ret;
@@ -25,11 +210,18 @@ static __init int xrt_lib_init(void)
if (ret)
return ret;

+ ret = bus_register(&xrt_bus_type);
+ if (ret) {
+ of_overlay_remove(&xrt_bus_ovcs_id);
+ return ret;
+ }
+
return 0;
}

static __exit void xrt_lib_fini(void)
{
+ bus_unregister(&xrt_bus_type);
of_overlay_remove(&xrt_bus_ovcs_id);
}

diff --git a/include/linux/xrt/xdevice.h b/include/linux/xrt/xdevice.h
new file mode 100644
index 000000000000..0b3fec9ae598
--- /dev/null
+++ b/include/linux/xrt/xdevice.h
@@ -0,0 +1,128 @@
+/* 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>
+#include <linux/of.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;
+ 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_driver - represent a xrt device driver
+ *
+ * driver: 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;
+ struct xrt_dev_file_ops file_ops;
+
+ /*
+ * 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)
+/*
+ * module_xrt_driver() - Helper macro for drivers that don't do
+ * anything special in module init/exit.
+ */
+#define module_xrt_driver(__xrt_driver) \
+ module_driver(__xrt_driver, xrt_register_driver, \
+ xrt_unregister_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, struct device_node *dn,
+ 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);
+
+#endif /* _XRT_DEVICE_H_ */
--
2.27.0
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