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, 186 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r0drv/linux/spinlock-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/spinlock-r0drv-linux.c
new file mode 100644
index 00000000..ac269880
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/linux/spinlock-r0drv-linux.c
@@ -0,0 +1,186 @@
+/* $Id: spinlock-r0drv-linux.c $ */
+/** @file
+ * IPRT - Spinlocks, Ring-0 Driver, Linux.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-linux-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/spinlock.h>
+
+#include <iprt/asm.h>
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+# include <iprt/asm-amd64-x86.h>
+#endif
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/mem.h>
+#include <iprt/mp.h>
+#include <iprt/thread.h>
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Wrapper for the spinlock_t structure.
+ */
+typedef struct RTSPINLOCKINTERNAL
+{
+    /** Spinlock magic value (RTSPINLOCK_MAGIC). */
+    uint32_t volatile       u32Magic;
+    /** The spinlock creation flags.  */
+    uint32_t                fFlags;
+    /** The saved interrupt flag. */
+    unsigned long volatile  fIntSaved;
+    /** The linux spinlock structure. */
+    spinlock_t              Spinlock;
+#ifdef RT_MORE_STRICT
+    /** The idAssertCpu variable before acquring the lock for asserting after
+     *  releasing the spinlock. */
+    RTCPUID volatile        idAssertCpu;
+    /** The CPU that owns the lock. */
+    RTCPUID volatile        idCpuOwner;
+#endif
+} RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;
+
+
+
+RTDECL(int)  RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+    PRTSPINLOCKINTERNAL pThis;
+    AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
+    RT_NOREF_PV(pszName);
+
+    /*
+     * Allocate.
+     */
+    Assert(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
+    pThis = (PRTSPINLOCKINTERNAL)RTMemAlloc(sizeof(*pThis));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+    /*
+     * Initialize and return.
+     */
+    pThis->u32Magic     = RTSPINLOCK_MAGIC;
+    pThis->fFlags       = fFlags;
+    pThis->fIntSaved    = 0;
+#ifdef RT_MORE_STRICT
+    pThis->idCpuOwner   = NIL_RTCPUID;
+    pThis->idAssertCpu  = NIL_RTCPUID;
+#endif
+
+    spin_lock_init(&pThis->Spinlock);
+
+    *pSpinlock = pThis;
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTSpinlockCreate);
+
+
+RTDECL(int)  RTSpinlockDestroy(RTSPINLOCK Spinlock)
+{
+    /*
+     * Validate input.
+     */
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    if (!pThis)
+        return VERR_INVALID_PARAMETER;
+    if (pThis->u32Magic != RTSPINLOCK_MAGIC)
+    {
+        AssertMsgFailed(("Invalid spinlock %p magic=%#x\n", pThis, pThis->u32Magic));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    ASMAtomicIncU32(&pThis->u32Magic);
+    RTMemFree(pThis);
+    return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTSpinlockDestroy);
+
+
+RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
+{
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    IPRT_LINUX_SAVE_EFL_AC();
+    RT_ASSERT_PREEMPT_CPUID_VAR();
+    AssertMsg(pThis && pThis->u32Magic == RTSPINLOCK_MAGIC,
+              ("pThis=%p u32Magic=%08x\n", pThis, pThis ? (int)pThis->u32Magic : 0));
+
+#ifdef CONFIG_PROVE_LOCKING
+    lockdep_off();
+#endif
+    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
+    {
+        unsigned long fIntSaved;
+        spin_lock_irqsave(&pThis->Spinlock, fIntSaved);
+        pThis->fIntSaved = fIntSaved;
+    }
+    else
+        spin_lock(&pThis->Spinlock);
+#ifdef CONFIG_PROVE_LOCKING
+    lockdep_on();
+#endif
+
+    IPRT_LINUX_RESTORE_EFL_ONLY_AC();
+    RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis);
+}
+RT_EXPORT_SYMBOL(RTSpinlockAcquire);
+
+
+RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock)
+{
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    IPRT_LINUX_SAVE_EFL_AC();           /* spin_unlock* may preempt and trash eflags.ac. */
+    RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE_VARS();
+    AssertMsg(pThis && pThis->u32Magic == RTSPINLOCK_MAGIC,
+              ("pThis=%p u32Magic=%08x\n", pThis, pThis ? (int)pThis->u32Magic : 0));
+    RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE(pThis);
+
+#ifdef CONFIG_PROVE_LOCKING
+    lockdep_off();
+#endif
+    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
+    {
+        unsigned long fIntSaved = pThis->fIntSaved;
+        pThis->fIntSaved = 0;
+        spin_unlock_irqrestore(&pThis->Spinlock, fIntSaved);
+    }
+    else
+        spin_unlock(&pThis->Spinlock);
+#ifdef CONFIG_PROVE_LOCKING
+    lockdep_on();
+#endif
+
+    IPRT_LINUX_RESTORE_EFL_ONLY_AC();
+    RT_ASSERT_PREEMPT_CPUID();
+}
+RT_EXPORT_SYMBOL(RTSpinlockRelease);
+