[PATCH V5 XRT Alveo 07/20] fpga: xrt: root driver infrastructure

Lizhi Hou
2021-04-27T20:59:55Z

Contains common code for all root drivers and handles root calls from
xrt drivers. This is part of root driver infrastructure.

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/events.h | 45 +++
drivers/fpga/xrt/include/xroot.h | 117 +++++++
drivers/fpga/xrt/lib/subdev_pool.h | 53 +++
drivers/fpga/xrt/lib/xroot.c | 536 +++++++++++++++++++++++++++++
4 files changed, 751 insertions(+)
create mode 100644 drivers/fpga/xrt/include/events.h
create mode 100644 drivers/fpga/xrt/include/xroot.h
create mode 100644 drivers/fpga/xrt/lib/subdev_pool.h
create mode 100644 drivers/fpga/xrt/lib/xroot.c

diff --git a/drivers/fpga/xrt/include/events.h b/drivers/fpga/xrt/include/events.h
new file mode 100644
index 000000000000..775171a47c8e
--- /dev/null
+++ b/drivers/fpga/xrt/include/events.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Cheng Zhen <maxz@xilinx.com>
+ */
+
+#ifndef _XRT_EVENTS_H_
+#define _XRT_EVENTS_H_
+
+#include "subdev_id.h"
+
+/*
+ * Event notification.
+ */
+enum xrt_events {
+ XRT_EVENT_TEST = 0, /* for testing */
+ /*
+ * Events related to specific subdev
+ * Callback arg: struct xrt_event_arg_subdev
+ */
+ XRT_EVENT_POST_CREATION,
+ XRT_EVENT_PRE_REMOVAL,
+ /*
+ * Events related to change of the whole board
+ * Callback arg: <none>
+ */
+ XRT_EVENT_PRE_HOT_RESET,
+ XRT_EVENT_POST_HOT_RESET,
+ XRT_EVENT_PRE_GATE_CLOSE,
+ XRT_EVENT_POST_GATE_OPEN,
+};
+
+struct xrt_event_arg_subdev {
+ enum xrt_subdev_id xevt_subdev_id;
+ int xevt_subdev_instance;
+};
+
+struct xrt_event {
+ enum xrt_events xe_evt;
+ struct xrt_event_arg_subdev xe_subdev;
+};
+
+#endif /* _XRT_EVENTS_H_ */
diff --git a/drivers/fpga/xrt/include/xroot.h b/drivers/fpga/xrt/include/xroot.h
new file mode 100644
index 000000000000..56461bcb07a9
--- /dev/null
+++ b/drivers/fpga/xrt/include/xroot.h
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Cheng Zhen <maxz@xilinx.com>
+ */
+
+#ifndef _XRT_ROOT_H_
+#define _XRT_ROOT_H_
+
+#include "xdevice.h"
+#include "subdev_id.h"
+#include "events.h"
+
+typedef bool (*xrt_subdev_match_t)(enum xrt_subdev_id, struct xrt_device *, void *);
+#define XRT_SUBDEV_MATCH_PREV ((xrt_subdev_match_t)-1)
+#define XRT_SUBDEV_MATCH_NEXT ((xrt_subdev_match_t)-2)
+
+/*
+ * Root calls.
+ */
+enum xrt_root_cmd {
+ /* Leaf actions. */
+ XRT_ROOT_GET_LEAF = 0,
+ XRT_ROOT_PUT_LEAF,
+ XRT_ROOT_GET_LEAF_HOLDERS,
+
+ /* Group actions. */
+ XRT_ROOT_CREATE_GROUP,
+ XRT_ROOT_REMOVE_GROUP,
+ XRT_ROOT_LOOKUP_GROUP,
+ XRT_ROOT_WAIT_GROUP_BRINGUP,
+
+ /* Event actions. */
+ XRT_ROOT_EVENT_SYNC,
+ XRT_ROOT_EVENT_ASYNC,
+
+ /* Device info. */
+ XRT_ROOT_GET_RESOURCE,
+ XRT_ROOT_GET_ID,
+
+ /* Misc. */
+ XRT_ROOT_HOT_RESET,
+ XRT_ROOT_HWMON,
+};
+
+struct xrt_root_get_leaf {
+ struct xrt_device *xpigl_caller_xdev;
+ xrt_subdev_match_t xpigl_match_cb;
+ void *xpigl_match_arg;
+ struct xrt_device *xpigl_tgt_xdev;
+};
+
+struct xrt_root_put_leaf {
+ struct xrt_device *xpipl_caller_xdev;
+ struct xrt_device *xpipl_tgt_xdev;
+};
+
+struct xrt_root_lookup_group {
+ struct xrt_device *xpilp_xdev; /* caller's xdev */
+ xrt_subdev_match_t xpilp_match_cb;
+ void *xpilp_match_arg;
+ int xpilp_grp_inst;
+};
+
+struct xrt_root_get_holders {
+ struct xrt_device *xpigh_xdev; /* caller's xdev */
+ char *xpigh_holder_buf;
+ size_t xpigh_holder_buf_len;
+};
+
+struct xrt_root_get_res {
+ u32 xpigr_region_id;
+ struct resource *xpigr_res;
+};
+
+struct xrt_root_get_id {
+ unsigned short xpigi_vendor_id;
+ unsigned short xpigi_device_id;
+ unsigned short xpigi_sub_vendor_id;
+ unsigned short xpigi_sub_device_id;
+};
+
+struct xrt_root_hwmon {
+ bool xpih_register;
+ const char *xpih_name;
+ void *xpih_drvdata;
+ const struct attribute_group **xpih_groups;
+ struct device *xpih_hwmon_dev;
+};
+
+/*
+ * Callback for leaf to make a root request. Arguments are: parent device, parent cookie, req,
+ * and arg.
+ */
+typedef int (*xrt_subdev_root_cb_t)(struct device *, void *, u32, void *);
+int xrt_subdev_root_request(struct xrt_device *self, u32 cmd, void *arg);
+
+/*
+ * Defines physical function (MPF / UPF) specific operations
+ * needed in common root driver.
+ */
+struct xroot_physical_function_callback {
+ void (*xpc_get_id)(struct device *dev, struct xrt_root_get_id *rid);
+ int (*xpc_get_resource)(struct device *dev, struct xrt_root_get_res *res);
+ void (*xpc_hot_reset)(struct device *dev);
+};
+
+int xroot_probe(struct device *dev, struct xroot_physical_function_callback *cb, void **root);
+void xroot_remove(void *root);
+bool xroot_wait_for_bringup(void *root);
+int xroot_create_group(void *xr, char *dtb);
+int xroot_add_simple_node(void *root, char *dtb, const char *endpoint);
+void xroot_broadcast(void *root, enum xrt_events evt);
+
+#endif /* _XRT_ROOT_H_ */
diff --git a/drivers/fpga/xrt/lib/subdev_pool.h b/drivers/fpga/xrt/lib/subdev_pool.h
new file mode 100644
index 000000000000..03f617d7ffd7
--- /dev/null
+++ b/drivers/fpga/xrt/lib/subdev_pool.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Cheng Zhen <maxz@xilinx.com>
+ */
+
+#ifndef _XRT_SUBDEV_POOL_H_
+#define _XRT_SUBDEV_POOL_H_
+
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include "xroot.h"
+
+/*
+ * The struct xrt_subdev_pool manages a list of xrt_subdevs for root and group drivers.
+ */
+struct xrt_subdev_pool {
+ struct list_head xsp_dev_list;
+ struct device *xsp_owner;
+ struct mutex xsp_lock; /* pool lock */
+ bool xsp_closing;
+};
+
+/*
+ * Subdev pool helper functions for root and group drivers only.
+ */
+void xrt_subdev_pool_init(struct device *dev,
+ struct xrt_subdev_pool *spool);
+void xrt_subdev_pool_fini(struct xrt_subdev_pool *spool);
+int xrt_subdev_pool_get(struct xrt_subdev_pool *spool,
+ xrt_subdev_match_t match,
+ void *arg, struct device *holder_dev,
+ struct xrt_device **xdevp);
+int xrt_subdev_pool_put(struct xrt_subdev_pool *spool,
+ struct xrt_device *xdev,
+ struct device *holder_dev);
+int xrt_subdev_pool_add(struct xrt_subdev_pool *spool,
+ enum xrt_subdev_id id, xrt_subdev_root_cb_t pcb,
+ void *pcb_arg, char *dtb);
+int xrt_subdev_pool_del(struct xrt_subdev_pool *spool,
+ enum xrt_subdev_id id, int instance);
+ssize_t xrt_subdev_pool_get_holders(struct xrt_subdev_pool *spool,
+ struct xrt_device *xdev,
+ char *buf, size_t len);
+
+void xrt_subdev_pool_trigger_event(struct xrt_subdev_pool *spool,
+ enum xrt_events evt);
+void xrt_subdev_pool_handle_event(struct xrt_subdev_pool *spool,
+ struct xrt_event *evt);
+
+#endif /* _XRT_SUBDEV_POOL_H_ */
diff --git a/drivers/fpga/xrt/lib/xroot.c b/drivers/fpga/xrt/lib/xroot.c
new file mode 100644
index 000000000000..7b3e540dd6c0
--- /dev/null
+++ b/drivers/fpga/xrt/lib/xroot.c
@@ -0,0 +1,536 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Alveo FPGA Root Functions
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Cheng Zhen <maxz@xilinx.com>
+ */
+
+#include <linux/module.h>
+#include <linux/hwmon.h>
+#include "xroot.h"
+#include "subdev_pool.h"
+#include "group.h"
+#include "metadata.h"
+
+#define xroot_err(xr, fmt, args...) dev_err((xr)->dev, "%s: " fmt, __func__, ##args)
+#define xroot_warn(xr, fmt, args...) dev_warn((xr)->dev, "%s: " fmt, __func__, ##args)
+#define xroot_info(xr, fmt, args...) dev_info((xr)->dev, "%s: " fmt, __func__, ##args)
+#define xroot_dbg(xr, fmt, args...) dev_dbg((xr)->dev, "%s: " fmt, __func__, ##args)
+
+#define XROOT_GROUP_FIRST (-1)
+#define XROOT_GROUP_LAST (-2)
+
+static int xroot_root_cb(struct device *, void *, u32, void *);
+
+struct xroot_evt {
+ struct list_head list;
+ struct xrt_event evt;
+ struct completion comp;
+ bool async;
+};
+
+struct xroot_events {
+ struct mutex evt_lock; /* event lock */
+ struct list_head evt_list;
+ struct work_struct evt_work;
+};
+
+struct xroot_groups {
+ struct xrt_subdev_pool pool;
+ struct work_struct bringup_work;
+ atomic_t bringup_pending_cnt;
+ atomic_t bringup_failed_cnt;
+ struct completion bringup_comp;
+};
+
+struct xroot {
+ struct device *dev;
+ struct xroot_events events;
+ struct xroot_groups groups;
+ struct xroot_physical_function_callback pf_cb;
+};
+
+struct xroot_group_match_arg {
+ enum xrt_subdev_id id;
+ int instance;
+};
+
+static bool xroot_group_match(enum xrt_subdev_id id, struct xrt_device *xdev, void *arg)
+{
+ struct xroot_group_match_arg *a = (struct xroot_group_match_arg *)arg;
+
+ /* xdev->instance is the instance of the subdev. */
+ return id == a->id && xdev->instance == a->instance;
+}
+
+static int xroot_get_group(struct xroot *xr, int instance, struct xrt_device **grpp)
+{
+ int rc = 0;
+ struct xrt_subdev_pool *grps = &xr->groups.pool;
+ struct device *dev = xr->dev;
+ struct xroot_group_match_arg arg = { XRT_SUBDEV_GRP, instance };
+
+ if (instance == XROOT_GROUP_LAST) {
+ rc = xrt_subdev_pool_get(grps, XRT_SUBDEV_MATCH_NEXT,
+ *grpp, dev, grpp);
+ } else if (instance == XROOT_GROUP_FIRST) {
+ rc = xrt_subdev_pool_get(grps, XRT_SUBDEV_MATCH_PREV,
+ *grpp, dev, grpp);
+ } else {
+ rc = xrt_subdev_pool_get(grps, xroot_group_match,
+ &arg, dev, grpp);
+ }
+
+ if (rc && rc != -ENOENT)
+ xroot_err(xr, "failed to hold group %d: %d", instance, rc);
+ return rc;
+}
+
+static void xroot_put_group(struct xroot *xr, struct xrt_device *grp)
+{
+ int inst = grp->instance;
+ int rc = xrt_subdev_pool_put(&xr->groups.pool, grp, xr->dev);
+
+ if (rc)
+ xroot_err(xr, "failed to release group %d: %d", inst, rc);
+}
+
+static int xroot_trigger_event(struct xroot *xr, struct xrt_event *e, bool async)
+{
+ struct xroot_evt *enew = vzalloc(sizeof(*enew));
+
+ if (!enew)
+ return -ENOMEM;
+
+ enew->evt = *e;
+ enew->async = async;
+ init_completion(&enew->comp);
+
+ mutex_lock(&xr->events.evt_lock);
+ list_add(&enew->list, &xr->events.evt_list);
+ mutex_unlock(&xr->events.evt_lock);
+
+ schedule_work(&xr->events.evt_work);
+
+ if (async)
+ return 0;
+
+ wait_for_completion(&enew->comp);
+ vfree(enew);
+ return 0;
+}
+
+static void
+xroot_group_trigger_event(struct xroot *xr, int inst, enum xrt_events e)
+{
+ int ret;
+ struct xrt_device *xdev = NULL;
+ struct xrt_event evt = { 0 };
+
+ WARN_ON(inst < 0);
+ /* Only triggers subdev specific events. */
+ if (e != XRT_EVENT_POST_CREATION && e != XRT_EVENT_PRE_REMOVAL) {
+ xroot_err(xr, "invalid event %d", e);
+ return;
+ }
+
+ ret = xroot_get_group(xr, inst, &xdev);
+ if (ret)
+ return;
+
+ /* Triggers event for children, first. */
+ xleaf_call(xdev, XRT_GROUP_TRIGGER_EVENT, (void *)(uintptr_t)e);
+
+ /* Triggers event for itself. */
+ evt.xe_evt = e;
+ evt.xe_subdev.xevt_subdev_id = XRT_SUBDEV_GRP;
+ evt.xe_subdev.xevt_subdev_instance = inst;
+ xroot_trigger_event(xr, &evt, false);
+
+ xroot_put_group(xr, xdev);
+}
+
+int xroot_create_group(void *root, char *dtb)
+{
+ struct xroot *xr = (struct xroot *)root;
+ int ret;
+
+ atomic_inc(&xr->groups.bringup_pending_cnt);
+ ret = xrt_subdev_pool_add(&xr->groups.pool, XRT_SUBDEV_GRP, xroot_root_cb, xr, dtb);
+ if (ret >= 0) {
+ schedule_work(&xr->groups.bringup_work);
+ } else {
+ atomic_dec(&xr->groups.bringup_pending_cnt);
+ atomic_inc(&xr->groups.bringup_failed_cnt);
+ xroot_err(xr, "failed to create group: %d", ret);
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(xroot_create_group);
+
+static int xroot_destroy_single_group(struct xroot *xr, int instance)
+{
+ struct xrt_device *xdev = NULL;
+ int ret;
+
+ WARN_ON(instance < 0);
+ ret = xroot_get_group(xr, instance, &xdev);
+ if (ret)
+ return ret;
+
+ xroot_group_trigger_event(xr, instance, XRT_EVENT_PRE_REMOVAL);
+
+ /* Now tear down all children in this group. */
+ ret = xleaf_call(xdev, XRT_GROUP_FINI_CHILDREN, NULL);
+ xroot_put_group(xr, xdev);
+ if (!ret)
+ ret = xrt_subdev_pool_del(&xr->groups.pool, XRT_SUBDEV_GRP, instance);
+
+ return ret;
+}
+
+static int xroot_destroy_group(struct xroot *xr, int instance)
+{
+ struct xrt_device *target = NULL;
+ struct xrt_device *deps = NULL;
+ int ret;
+
+ WARN_ON(instance < 0);
+ /*
+ * Make sure target group exists and can't go away before
+ * we remove it's dependents
+ */
+ ret = xroot_get_group(xr, instance, &target);
+ if (ret)
+ return ret;
+
+ /*
+ * Remove all groups depend on target one.
+ * Assuming subdevs in higher group ID can depend on ones in
+ * lower ID groups, we remove them in the reservse order.
+ */
+ while (xroot_get_group(xr, XROOT_GROUP_LAST, &deps) != -ENOENT) {
+ int inst = deps->instance;
+
+ xroot_put_group(xr, deps);
+ /* Reached the target group instance, stop here. */
+ if (instance == inst)
+ break;
+ xroot_destroy_single_group(xr, inst);
+ deps = NULL;
+ }
+
+ /* Now we can remove the target group. */
+ xroot_put_group(xr, target);
+ return xroot_destroy_single_group(xr, instance);
+}
+
+static int xroot_lookup_group(struct xroot *xr,
+ struct xrt_root_lookup_group *arg)
+{
+ int rc = -ENOENT;
+ struct xrt_device *grp = NULL;
+
+ while (rc < 0 && xroot_get_group(xr, XROOT_GROUP_LAST, &grp) != -ENOENT) {
+ if (arg->xpilp_match_cb(XRT_SUBDEV_GRP, grp, arg->xpilp_match_arg))
+ rc = grp->instance;
+ xroot_put_group(xr, grp);
+ }
+ return rc;
+}
+
+static void xroot_event_work(struct work_struct *work)
+{
+ struct xroot_evt *tmp;
+ struct xroot *xr = container_of(work, struct xroot, events.evt_work);
+
+ mutex_lock(&xr->events.evt_lock);
+ while (!list_empty(&xr->events.evt_list)) {
+ tmp = list_first_entry(&xr->events.evt_list, struct xroot_evt, list);
+ list_del(&tmp->list);
+ mutex_unlock(&xr->events.evt_lock);
+
+ xrt_subdev_pool_handle_event(&xr->groups.pool, &tmp->evt);
+
+ if (tmp->async)
+ vfree(tmp);
+ else
+ complete(&tmp->comp);
+
+ mutex_lock(&xr->events.evt_lock);
+ }
+ mutex_unlock(&xr->events.evt_lock);
+}
+
+static void xroot_event_init(struct xroot *xr)
+{
+ INIT_LIST_HEAD(&xr->events.evt_list);
+ mutex_init(&xr->events.evt_lock);
+ INIT_WORK(&xr->events.evt_work, xroot_event_work);
+}
+
+static void xroot_event_fini(struct xroot *xr)
+{
+ flush_scheduled_work();
+ WARN_ON(!list_empty(&xr->events.evt_list));
+}
+
+static int xroot_get_leaf(struct xroot *xr, struct xrt_root_get_leaf *arg)
+{
+ int rc = -ENOENT;
+ struct xrt_device *grp = NULL;
+
+ while (rc && xroot_get_group(xr, XROOT_GROUP_LAST, &grp) != -ENOENT) {
+ rc = xleaf_call(grp, XRT_GROUP_GET_LEAF, arg);
+ xroot_put_group(xr, grp);
+ }
+ return rc;
+}
+
+static int xroot_put_leaf(struct xroot *xr, struct xrt_root_put_leaf *arg)
+{
+ int rc = -ENOENT;
+ struct xrt_device *grp = NULL;
+
+ while (rc && xroot_get_group(xr, XROOT_GROUP_LAST, &grp) != -ENOENT) {
+ rc = xleaf_call(grp, XRT_GROUP_PUT_LEAF, arg);
+ xroot_put_group(xr, grp);
+ }
+ return rc;
+}
+
+static int xroot_root_cb(struct device *dev, void *parg, enum xrt_root_cmd cmd, void *arg)
+{
+ struct xroot *xr = (struct xroot *)parg;
+ int rc = 0;
+
+ switch (cmd) {
+ /* Leaf actions. */
+ case XRT_ROOT_GET_LEAF: {
+ struct xrt_root_get_leaf *getleaf = (struct xrt_root_get_leaf *)arg;
+
+ rc = xroot_get_leaf(xr, getleaf);
+ break;
+ }
+ case XRT_ROOT_PUT_LEAF: {
+ struct xrt_root_put_leaf *putleaf = (struct xrt_root_put_leaf *)arg;
+
+ rc = xroot_put_leaf(xr, putleaf);
+ break;
+ }
+ case XRT_ROOT_GET_LEAF_HOLDERS: {
+ struct xrt_root_get_holders *holders = (struct xrt_root_get_holders *)arg;
+
+ rc = xrt_subdev_pool_get_holders(&xr->groups.pool,
+ holders->xpigh_xdev,
+ holders->xpigh_holder_buf,
+ holders->xpigh_holder_buf_len);
+ break;
+ }
+
+ /* Group actions. */
+ case XRT_ROOT_CREATE_GROUP:
+ rc = xroot_create_group(xr, (char *)arg);
+ break;
+ case XRT_ROOT_REMOVE_GROUP:
+ rc = xroot_destroy_group(xr, (int)(uintptr_t)arg);
+ break;
+ case XRT_ROOT_LOOKUP_GROUP: {
+ struct xrt_root_lookup_group *getgrp = (struct xrt_root_lookup_group *)arg;
+
+ rc = xroot_lookup_group(xr, getgrp);
+ break;
+ }
+ case XRT_ROOT_WAIT_GROUP_BRINGUP:
+ rc = xroot_wait_for_bringup(xr) ? 0 : -EINVAL;
+ break;
+
+ /* Event actions. */
+ case XRT_ROOT_EVENT_SYNC:
+ case XRT_ROOT_EVENT_ASYNC: {
+ bool async = (cmd == XRT_ROOT_EVENT_ASYNC);
+ struct xrt_event *evt = (struct xrt_event *)arg;
+
+ rc = xroot_trigger_event(xr, evt, async);
+ break;
+ }
+
+ /* Device info. */
+ case XRT_ROOT_GET_RESOURCE: {
+ struct xrt_root_get_res *res = (struct xrt_root_get_res *)arg;
+
+ if (xr->pf_cb.xpc_get_resource) {
+ rc = xr->pf_cb.xpc_get_resource(xr->dev, res);
+ } else {
+ xroot_err(xr, "get resource is not supported");
+ rc = -EOPNOTSUPP;
+ }
+ break;
+ }
+ case XRT_ROOT_GET_ID: {
+ struct xrt_root_get_id *id = (struct xrt_root_get_id *)arg;
+
+ if (xr->pf_cb.xpc_get_id)
+ xr->pf_cb.xpc_get_id(xr->dev, id);
+ else
+ memset(id, 0, sizeof(*id));
+ break;
+ }
+
+ /* MISC generic root driver functions. */
+ case XRT_ROOT_HOT_RESET: {
+ if (xr->pf_cb.xpc_hot_reset) {
+ xr->pf_cb.xpc_hot_reset(xr->dev);
+ } else {
+ xroot_err(xr, "hot reset is not supported");
+ rc = -EOPNOTSUPP;
+ }
+ break;
+ }
+ case XRT_ROOT_HWMON: {
+ struct xrt_root_hwmon *hwmon = (struct xrt_root_hwmon *)arg;
+
+ if (hwmon->xpih_register) {
+ hwmon->xpih_hwmon_dev =
+ hwmon_device_register_with_info(xr->dev,
+ hwmon->xpih_name,
+ hwmon->xpih_drvdata,
+ NULL,
+ hwmon->xpih_groups);
+ } else {
+ hwmon_device_unregister(hwmon->xpih_hwmon_dev);
+ }
+ break;
+ }
+
+ default:
+ xroot_err(xr, "unknown IOCTL cmd %d", cmd);
+ rc = -EINVAL;
+ break;
+ }
+
+ return rc;
+}
+
+static void xroot_bringup_group_work(struct work_struct *work)
+{
+ struct xrt_device *xdev = NULL;
+ struct xroot *xr = container_of(work, struct xroot, groups.bringup_work);
+
+ while (xroot_get_group(xr, XROOT_GROUP_FIRST, &xdev) != -ENOENT) {
+ int r, i;
+
+ i = xdev->instance;
+ r = xleaf_call(xdev, XRT_GROUP_INIT_CHILDREN, NULL);
+ xroot_put_group(xr, xdev);
+ if (r == -EEXIST)
+ continue; /* Already brough up, nothing to do. */
+ if (r)
+ atomic_inc(&xr->groups.bringup_failed_cnt);
+
+ xroot_group_trigger_event(xr, i, XRT_EVENT_POST_CREATION);
+
+ if (atomic_dec_and_test(&xr->groups.bringup_pending_cnt))
+ complete(&xr->groups.bringup_comp);
+ }
+}
+
+static void xroot_groups_init(struct xroot *xr)
+{
+ xrt_subdev_pool_init(xr->dev, &xr->groups.pool);
+ INIT_WORK(&xr->groups.bringup_work, xroot_bringup_group_work);
+ atomic_set(&xr->groups.bringup_pending_cnt, 0);
+ atomic_set(&xr->groups.bringup_failed_cnt, 0);
+ init_completion(&xr->groups.bringup_comp);
+}
+
+static void xroot_groups_fini(struct xroot *xr)
+{
+ flush_scheduled_work();
+ xrt_subdev_pool_fini(&xr->groups.pool);
+}
+
+int xroot_add_simple_node(void *root, char *dtb, const char *endpoint)
+{
+ struct xroot *xr = (struct xroot *)root;
+ struct device *dev = xr->dev;
+ struct xrt_md_endpoint ep = { 0 };
+ int ret = 0;
+
+ ep.ep_name = endpoint;
+ ret = xrt_md_add_endpoint(dev, dtb, &ep);
+ if (ret)
+ xroot_err(xr, "add %s failed, ret %d", endpoint, ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(xroot_add_simple_node);
+
+bool xroot_wait_for_bringup(void *root)
+{
+ struct xroot *xr = (struct xroot *)root;
+
+ wait_for_completion(&xr->groups.bringup_comp);
+ return atomic_read(&xr->groups.bringup_failed_cnt) == 0;
+}
+EXPORT_SYMBOL_GPL(xroot_wait_for_bringup);
+
+int xroot_probe(struct device *dev, struct xroot_physical_function_callback *cb, void **root)
+{
+ struct xroot *xr = NULL;
+
+ dev_info(dev, "%s: probing...", __func__);
+
+ xr = devm_kzalloc(dev, sizeof(*xr), GFP_KERNEL);
+ if (!xr)
+ return -ENOMEM;
+
+ xr->dev = dev;
+ xr->pf_cb = *cb;
+ xroot_groups_init(xr);
+ xroot_event_init(xr);
+
+ *root = xr;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xroot_probe);
+
+void xroot_remove(void *root)
+{
+ struct xroot *xr = (struct xroot *)root;
+ struct xrt_device *grp = NULL;
+
+ xroot_info(xr, "leaving...");
+
+ if (xroot_get_group(xr, XROOT_GROUP_FIRST, &grp) == 0) {
+ int instance = grp->instance;
+
+ xroot_put_group(xr, grp);
+ xroot_destroy_group(xr, instance);
+ }
+
+ xroot_event_fini(xr);
+ xroot_groups_fini(xr);
+}
+EXPORT_SYMBOL_GPL(xroot_remove);
+
+void xroot_broadcast(void *root, enum xrt_events evt)
+{
+ struct xroot *xr = (struct xroot *)root;
+ struct xrt_event e = { 0 };
+
+ /* Root pf driver only broadcasts below two events. */
+ if (evt != XRT_EVENT_POST_CREATION && evt != XRT_EVENT_PRE_REMOVAL) {
+ xroot_info(xr, "invalid event %d", evt);
+ return;
+ }
+
+ e.xe_evt = evt;
+ e.xe_subdev.xevt_subdev_id = XRT_ROOT;
+ e.xe_subdev.xevt_subdev_instance = 0;
+ xroot_trigger_event(xr, &e, false);
+}
+EXPORT_SYMBOL_GPL(xroot_broadcast);
--
2.27.0