Changeset 8300c72 in mainline for uspace/srv/devman/fun.c

Timestamp:

2025-03-03T22:58:05Z (13 hours ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

master

Children:

77a0119

Parents:

f35749e

Message:

Quiesce devices before proceeding with shutdown.

Only implemented for e1k, uhci and xhci.

File:

• uspace/srv/devman/fun.c (modified) (2 diffs)

uspace/srv/devman/fun.c

@@ -1 +1 @@
 /*
+ * Copyright (c) 2025 Jiri Svoboda
  * Copyright (c) 2010 Lenka Trochtova
  * All rights reserved.
@@ -428 +429 @@
 }
 
+errno_t fun_quiesce(fun_node_t *fun)
+{
+        errno_t rc;
+
+        log_msg(LOG_DEFAULT, LVL_DEBUG, "fun_quiesce(%s)", fun->pathname);
+        fibril_rwlock_read_lock(&device_tree.rwlock);
+
+        if (fun->state == FUN_OFF_LINE) {
+                fibril_rwlock_read_unlock(&device_tree.rwlock);
+                log_msg(LOG_DEFAULT, LVL_DEBUG, "Function %s is off line.",
+                    fun->pathname);
+                return EOK;
+        }
+
+        if (fun->ftype != fun_inner) {
+                /* Nothing to do */
+                log_msg(LOG_DEFAULT, LVL_DEBUG, "Nothing to do for external "
+                    "function %s\n", fun->pathname);
+                fibril_rwlock_read_unlock(&device_tree.rwlock);
+                return EOK;
+        }
+
+        log_msg(LOG_DEFAULT, LVL_DEBUG, "Quiescing inner function %s.",
+            fun->pathname);
+
+        if (fun->child == NULL) {
+                log_msg(LOG_DEFAULT, LVL_DEBUG, "Function %s child is NULL.",
+                    fun->pathname);
+                fibril_rwlock_read_unlock(&device_tree.rwlock);
+                return EOK;
+        }
+
+        dev_node_t *dev = fun->child;
+        device_state_t dev_state;
+
+        dev_add_ref(dev);
+        dev_state = dev->state;
+
+        fibril_rwlock_read_unlock(&device_tree.rwlock);
+
+        /* If device is owned by driver, ask driver to quiesce it. */
+        if (dev_state == DEVICE_USABLE) {
+                log_msg(LOG_DEFAULT, LVL_DEBUG, "Call driver_dev_quiesce() "
+                    "for %s.", fun->pathname);
+                rc = driver_dev_quiesce(&device_tree, dev);
+                if (rc != EOK) {
+                        log_msg(LOG_DEFAULT, LVL_ERROR,
+                            "driver_dev_quiesce() -> %d", (int)rc);
+                        dev_del_ref(dev);
+                        return ENOTSUP;
+                }
+        }
+
+        dev_del_ref(dev);
+        return EOK;
+}
+
 /** @}
  */