Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 281 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r0drv/netbsd/sleepqueue-r0drv-netbsd.h b/src/VBox/Runtime/r0drv/netbsd/sleepqueue-r0drv-netbsd.h
new file mode 100644
index 00000000..2a153786
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/sleepqueue-r0drv-netbsd.h
@@ -0,0 +1,281 @@
+/* $Id: sleepqueue-r0drv-netbsd.h $ */
+/** @file
+ * IPRT - NetBSD Ring-0 Driver Helpers for Abstracting Sleep Queues,
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef IPRT_INCLUDED_SRC_r0drv_netbsd_sleepqueue_r0drv_netbsd_h
+#define IPRT_INCLUDED_SRC_r0drv_netbsd_sleepqueue_r0drv_netbsd_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "the-netbsd-kernel.h"
+
+#include <iprt/asm-math.h>
+#include <iprt/err.h>
+#include <iprt/time.h>
+
+static syncobj_t vbox_syncobj = {
+        SOBJ_SLEEPQ_FIFO,
+        sleepq_unsleep,
+        sleepq_changepri,
+        sleepq_lendpri,
+        syncobj_noowner,
+};
+
+/**
+ * Kernel mode Linux wait state structure.
+ */
+typedef struct RTR0SEMBSDSLEEP
+{
+    /** The absolute timeout given as nano seconds since the start of the
+     *  monotonic clock. */
+    uint64_t        uNsAbsTimeout;
+    /** The timeout in ticks. Updated after waiting. */
+    int             iTimeout;
+    /** Set if it's an indefinite wait. */
+    bool            fIndefinite;
+    /** Set if we've already timed out.
+     * Set by rtR0SemBsdWaitDoIt and read by rtR0SemBsdWaitHasTimedOut. */
+    bool            fTimedOut;
+    /** Flag whether the wait was interrupted. */
+    bool            fInterrupted;
+    /** flag whether the wait is interruptible or not. */
+    bool            fInterruptible;
+    /** Opaque wait channel id. */
+    wchan_t         wchan;
+    sleepq_t *sq;
+    kmutex_t *sq_lock;
+} RTR0SEMBSDSLEEP;
+/** Pointer to a NetBSD wait state. */
+typedef RTR0SEMBSDSLEEP *PRTR0SEMBSDSLEEP;
+
+
+/**
+ * Updates the timeout of the NetBSD wait.
+ *
+ * @returns RTSEMWAIT_FLAGS_INDEFINITE if the timeout value is too big.
+ *          0 otherwise
+ * @param   pWait               The wait structure.
+ * @param   uTimeout            The relative timeout in nanoseconds.
+ */
+DECLINLINE(void) rtR0SemBsdWaitUpdateTimeout(PRTR0SEMBSDSLEEP pWait)
+{
+    /* Convert absolute timeout to ticks */
+    uint64_t now = RTTimeNanoTS();
+    if (now >= pWait->uNsAbsTimeout) {
+        pWait->iTimeout = 0;
+    } else {
+        uint64_t nanos = pWait->uNsAbsTimeout - now;
+        pWait->iTimeout = hz * nanos / 1000000000;
+        /* for 1ms wait, wait at least one tick ?? */
+        if ((pWait->iTimeout == 0) && (nanos >= 1000000)) {
+            pWait->iTimeout = 1;
+        }
+    }
+}
+
+/**
+ * Initializes a wait.
+ *
+ * The caller MUST check the wait condition BEFORE calling this function or the
+ * timeout logic will be flawed.
+ *
+ * @returns VINF_SUCCESS or VERR_TIMEOUT.
+ * @param   pWait               The wait structure.
+ * @param   fFlags              The wait flags.
+ * @param   uTimeout            The timeout.
+ * @param   pvWaitChan          The opaque wait channel.
+ */
+DECLINLINE(int) rtR0SemBsdWaitInit(PRTR0SEMBSDSLEEP pWait, uint32_t fFlags, uint64_t uTimeout,
+                                   void *pvWaitChan)
+{
+    if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE) {
+        pWait->fIndefinite      = true;
+        pWait->iTimeout = 0;
+        pWait->uNsAbsTimeout = 0;
+    } else {
+        if (fFlags & RTSEMWAIT_FLAGS_RELATIVE) {
+            if (fFlags & RTSEMWAIT_FLAGS_MILLISECS) {
+                pWait->uNsAbsTimeout = uTimeout * 1000000 + RTTimeSystemNanoTS();
+            } else {
+                pWait->uNsAbsTimeout = uTimeout + RTTimeSystemNanoTS();
+            }
+        } else {
+            if (fFlags & RTSEMWAIT_FLAGS_MILLISECS) {
+                pWait->uNsAbsTimeout = uTimeout * 1000000;
+            } else {
+                pWait->uNsAbsTimeout = uTimeout;
+            }
+        }
+        rtR0SemBsdWaitUpdateTimeout(pWait);
+        if (pWait->iTimeout == 0) {
+            return VERR_TIMEOUT;
+        }
+    }
+
+    pWait->fTimedOut   = false;
+    /*
+     * Initialize the wait queue related bits.
+     */
+    pWait->fInterruptible = fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE
+                            ? true : false;
+    pWait->fInterrupted   = false;
+    pWait->wchan = pvWaitChan;
+    pWait->sq = NULL;
+    pWait->sq_lock = NULL;
+
+    return VINF_SUCCESS;
+}
+
+/**
+ * Prepares the next wait.
+ *
+ * This must be called before rtR0SemBsdWaitDoIt, and the caller should check
+ * the exit conditions inbetween the two calls.
+ *
+ * @param   pWait               The wait structure.
+ */
+DECLINLINE(void) rtR0SemBsdWaitPrepare(PRTR0SEMBSDSLEEP pWait)
+{
+    pWait->sq = sleeptab_lookup(&sleeptab, pWait->wchan, &pWait->sq_lock);
+}
+
+/**
+ * Do the actual wait.
+ *
+ * @param   pWait               The wait structure.
+ */
+DECLINLINE(void) rtR0SemBsdWaitDoIt(PRTR0SEMBSDSLEEP pWait)
+{
+    sleepq_enter(pWait->sq, curlwp, pWait->sq_lock);
+    sleepq_enqueue(pWait->sq, pWait->wchan, "VBoxIS", &vbox_syncobj);
+
+    pWait->sq = NULL;
+    pWait->sq_lock = NULL;
+
+    int error = sleepq_block(pWait->iTimeout, pWait->fInterruptible);
+    if (error == EWOULDBLOCK) {
+        if (!pWait->fIndefinite) {
+            pWait->fTimedOut = true;
+        }
+    } else if (error == ERESTART) {
+        if (pWait->fInterruptible) {
+            pWait->fInterrupted = true;
+        } else if (!pWait->fIndefinite) {
+            rtR0SemBsdWaitUpdateTimeout(pWait);
+            if (pWait->iTimeout == 0) {
+                pWait->fTimedOut = true;
+            }
+        }
+    } else if (error == EINTR) {
+        if (pWait->fInterruptible) {
+            pWait->fInterrupted = true;
+        } else if (!pWait->fIndefinite) {
+            rtR0SemBsdWaitUpdateTimeout(pWait);
+            if (pWait->iTimeout == 0) {
+                pWait->fTimedOut = true;
+            }
+        }
+    } else if (error) {
+        AssertMsgFailed(("sleepq_block -> %d\n", error));
+    }
+}
+
+
+/**
+ * Checks if a NetBSD wait was interrupted.
+ *
+ * @returns true / false
+ * @param   pWait               The wait structure.
+ * @remarks This shall be called before the first rtR0SemLnxWaitDoIt().
+ */
+DECLINLINE(bool) rtR0SemBsdWaitWasInterrupted(PRTR0SEMBSDSLEEP pWait)
+{
+    return pWait->fInterrupted;
+}
+
+
+/**
+ * Checks if a NetBSD wait has timed out.
+ *
+ * @returns true / false
+ * @param   pWait               The wait structure.
+ */
+DECLINLINE(bool) rtR0SemBsdWaitHasTimedOut(PRTR0SEMBSDSLEEP pWait)
+{
+    return pWait->fTimedOut;
+}
+
+
+/**
+ * Deletes a NetBSD wait.
+ *
+ * @param   pWait               The wait structure.
+ */
+DECLINLINE(void) rtR0SemBsdWaitDelete(PRTR0SEMBSDSLEEP pWait)
+{
+    if (pWait->sq_lock != NULL) {
+        mutex_spin_exit(pWait->sq_lock);
+        pWait->sq = NULL;
+        pWait->sq_lock = NULL;
+    }
+}
+
+
+/**
+ * Signals the wait channel.
+ *
+ * @param  pvWaitChan           The opaque wait channel handle.
+ */
+DECLINLINE(void) rtR0SemBsdSignal(void *pvWaitChan)
+{
+    kmutex_t *mp;
+    sleepq_t *sq = sleeptab_lookup(&sleeptab, pvWaitChan, &mp);
+    sleepq_wake(sq, pvWaitChan, 1, mp);
+}
+
+/**
+ * Wakes up all waiters on the wait channel.
+ *
+ * @param  pvWaitChan           The opaque wait channel handle.
+ */
+DECLINLINE(void) rtR0SemBsdBroadcast(void *pvWaitChan)
+{
+    kmutex_t *mp;
+    sleepq_t *sq = sleeptab_lookup(&sleeptab, pvWaitChan, &mp);
+    sleepq_wake(sq, pvWaitChan, ~0u, mp);
+}
+
+/**
+ * Gets the max resolution of the timeout machinery.
+ *
+ * @returns Resolution specified in nanoseconds.
+ */
+DECLINLINE(uint32_t) rtR0SemBsdWaitGetResolution(void)
+{
+    return 1000000000 / hz; /* ns */
+}
+
+#endif /* !IPRT_INCLUDED_SRC_r0drv_netbsd_sleepqueue_r0drv_netbsd_h */