1 files changed, 378 insertions, 0 deletions
diff --git a/src/VBox/Additions/common/VBoxVideo/VBVABase.cpp b/src/VBox/Additions/common/VBoxVideo/VBVABase.cpp
new file mode 100644
index 00000000..68bc853a
--- /dev/null
+++ b/src/VBox/Additions/common/VBoxVideo/VBVABase.cpp
@@ -0,0 +1,378 @@
+/* $Id: VBVABase.cpp $ */
+/** @file
+ * VirtualBox Video driver, common code - VBVA initialisation and helper
+ * functions.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <VBoxVideoGuest.h>
+#include <VBoxVideoIPRT.h>
+#include <HGSMIChannels.h>
+
+/*
+ * There is a hardware ring buffer in the graphics device video RAM, formerly
+ * in the VBox VMMDev PCI memory space.
+ * All graphics commands go there serialized by VBoxVBVABufferBeginUpdate.
+ * and vboxHwBufferEndUpdate.
+ *
+ * off32Free is writing position. off32Data is reading position.
+ * off32Free == off32Data means buffer is empty.
+ * There must be always gap between off32Data and off32Free when data
+ * are in the buffer.
+ * Guest only changes off32Free, host changes off32Data.
+ */
+
+/* Forward declarations of internal functions. */
+static void vboxHwBufferFlush(PHGSMIGUESTCOMMANDCONTEXT pCtx);
+static void vboxHwBufferPlaceDataAt(PVBVABUFFERCONTEXT pCtx, const void *p,
+                                    uint32_t cb, uint32_t offset);
+static bool vboxHwBufferWrite(PVBVABUFFERCONTEXT pCtx,
+                              PHGSMIGUESTCOMMANDCONTEXT pHGSMICtx,
+                              const void *p, uint32_t cb);
+
+
+static bool vboxVBVAInformHost(PVBVABUFFERCONTEXT pCtx, PHGSMIGUESTCOMMANDCONTEXT pHGSMICtx, int32_t cScreen, bool fEnable)
+{
+    bool fRc = false;
+
+#if 0  /* All callers check this */
+    if (ppdev->bHGSMISupported)
+#endif
+    {
+        VBVAENABLE_EX RT_UNTRUSTED_VOLATILE_HOST *pEnable =
+            (VBVAENABLE_EX RT_UNTRUSTED_VOLATILE_HOST *)VBoxHGSMIBufferAlloc(pHGSMICtx, sizeof(VBVAENABLE_EX),
+                                                                             HGSMI_CH_VBVA, VBVA_ENABLE);
+        if (pEnable != NULL)
+        {
+            pEnable->Base.u32Flags  = fEnable ? VBVA_F_ENABLE : VBVA_F_DISABLE;
+            pEnable->Base.u32Offset = pCtx->offVRAMBuffer;
+            pEnable->Base.i32Result = VERR_NOT_SUPPORTED;
+            if (cScreen >= 0)
+            {
+                pEnable->Base.u32Flags |= VBVA_F_EXTENDED | VBVA_F_ABSOFFSET;
+                pEnable->u32ScreenId    = cScreen;
+            }
+
+            VBoxHGSMIBufferSubmit(pHGSMICtx, pEnable);
+
+            if (fEnable)
+                fRc = RT_SUCCESS(pEnable->Base.i32Result);
+            else
+                fRc = true;
+
+            VBoxHGSMIBufferFree(pHGSMICtx, pEnable);
+        }
+        else
+        {
+            // LogFunc(("HGSMIHeapAlloc failed\n"));
+        }
+    }
+
+    return fRc;
+}
+
+/*
+ * Public hardware buffer methods.
+ */
+DECLHIDDEN(bool) VBoxVBVAEnable(PVBVABUFFERCONTEXT pCtx,
+                                PHGSMIGUESTCOMMANDCONTEXT pHGSMICtx,
+                                VBVABUFFER *pVBVA, int32_t cScreen)
+{
+    bool fRc = false;
+
+    // LogFlowFunc(("pVBVA %p\n", pVBVA));
+
+#if 0  /* All callers check this */
+    if (ppdev->bHGSMISupported)
+#endif
+    {
+        // LogFunc(("pVBVA %p vbva off 0x%x\n", pVBVA, pCtx->offVRAMBuffer));
+
+        pVBVA->hostFlags.u32HostEvents      = 0;
+        pVBVA->hostFlags.u32SupportedOrders = 0;
+        pVBVA->off32Data          = 0;
+        pVBVA->off32Free          = 0;
+        memset(pVBVA->aRecords, 0, sizeof (pVBVA->aRecords));
+        pVBVA->indexRecordFirst   = 0;
+        pVBVA->indexRecordFree    = 0;
+        pVBVA->cbPartialWriteThreshold = 256;
+        pVBVA->cbData             = pCtx->cbBuffer - sizeof (VBVABUFFER) + sizeof (pVBVA->au8Data);
+
+        pCtx->fHwBufferOverflow = false;
+        pCtx->pRecord    = NULL;
+        pCtx->pVBVA      = pVBVA;
+
+        fRc = vboxVBVAInformHost(pCtx, pHGSMICtx, cScreen, true);
+    }
+
+    if (!fRc)
+    {
+        VBoxVBVADisable(pCtx, pHGSMICtx, cScreen);
+    }
+
+    return fRc;
+}
+
+DECLHIDDEN(void) VBoxVBVADisable(PVBVABUFFERCONTEXT pCtx,
+                                 PHGSMIGUESTCOMMANDCONTEXT pHGSMICtx,
+                                 int32_t cScreen)
+{
+    // LogFlowFunc(("\n"));
+
+    pCtx->fHwBufferOverflow = false;
+    pCtx->pRecord           = NULL;
+    pCtx->pVBVA             = NULL;
+
+    vboxVBVAInformHost(pCtx, pHGSMICtx, cScreen, false);
+}
+
+DECLHIDDEN(bool) VBoxVBVABufferBeginUpdate(PVBVABUFFERCONTEXT pCtx,
+                                           PHGSMIGUESTCOMMANDCONTEXT pHGSMICtx)
+{
+    bool fRc = false;
+
+    // LogFunc(("flags = 0x%08X\n", pCtx->pVBVA? pCtx->pVBVA->u32HostEvents: -1));
+
+    if (   pCtx->pVBVA
+        && (pCtx->pVBVA->hostFlags.u32HostEvents & VBVA_F_MODE_ENABLED))
+    {
+        uint32_t indexRecordNext;
+
+        Assert(!pCtx->fHwBufferOverflow);
+        Assert(pCtx->pRecord == NULL);
+
+        indexRecordNext = (pCtx->pVBVA->indexRecordFree + 1) % VBVA_MAX_RECORDS;
+
+        if (indexRecordNext == pCtx->pVBVA->indexRecordFirst)
+        {
+            /* All slots in the records queue are used. */
+            vboxHwBufferFlush (pHGSMICtx);
+        }
+
+        if (indexRecordNext == pCtx->pVBVA->indexRecordFirst)
+        {
+            /* Even after flush there is no place. Fail the request. */
+            // LogFunc(("no space in the queue of records!!! first %d, last %d\n",
+            //          pCtx->pVBVA->indexRecordFirst, pCtx->pVBVA->indexRecordFree));
+        }
+        else
+        {
+            /* Initialize the record. */
+            VBVARECORD *pRecord = &pCtx->pVBVA->aRecords[pCtx->pVBVA->indexRecordFree];
+
+            pRecord->cbRecord = VBVA_F_RECORD_PARTIAL;
+
+            pCtx->pVBVA->indexRecordFree = indexRecordNext;
+
+            // LogFunc(("indexRecordNext = %d\n", indexRecordNext));
+
+            /* Remember which record we are using. */
+            pCtx->pRecord = pRecord;
+
+            fRc = true;
+        }
+    }
+
+    return fRc;
+}
+
+DECLHIDDEN(void) VBoxVBVABufferEndUpdate(PVBVABUFFERCONTEXT pCtx)
+{
+    VBVARECORD *pRecord;
+
+    // LogFunc(("\n"));
+
+    Assert(pCtx->pVBVA);
+
+    pRecord = pCtx->pRecord;
+    Assert(pRecord && (pRecord->cbRecord & VBVA_F_RECORD_PARTIAL));
+
+    /* Mark the record completed. */
+    pRecord->cbRecord &= ~VBVA_F_RECORD_PARTIAL;
+
+    pCtx->fHwBufferOverflow = false;
+    pCtx->pRecord = NULL;
+}
+
+/*
+ * Private operations.
+ */
+static uint32_t vboxHwBufferAvail (const VBVABUFFER *pVBVA)
+{
+    int32_t i32Diff = pVBVA->off32Data - pVBVA->off32Free;
+
+    return i32Diff > 0? i32Diff: pVBVA->cbData + i32Diff;
+}
+
+static void vboxHwBufferFlush(PHGSMIGUESTCOMMANDCONTEXT pCtx)
+{
+    /* Issue the flush command. */
+    VBVAFLUSH RT_UNTRUSTED_VOLATILE_HOST *pFlush =
+        (VBVAFLUSH RT_UNTRUSTED_VOLATILE_HOST * )VBoxHGSMIBufferAlloc(pCtx, sizeof(VBVAFLUSH), HGSMI_CH_VBVA, VBVA_FLUSH);
+    if (pFlush != NULL)
+    {
+        pFlush->u32Reserved = 0;
+
+        VBoxHGSMIBufferSubmit(pCtx, pFlush);
+
+        VBoxHGSMIBufferFree(pCtx, pFlush);
+    }
+    else
+    {
+        // LogFunc(("HGSMIHeapAlloc failed\n"));
+    }
+}
+
+static void vboxHwBufferPlaceDataAt(PVBVABUFFERCONTEXT pCtx, const void *p,
+                                    uint32_t cb, uint32_t offset)
+{
+    VBVABUFFER *pVBVA = pCtx->pVBVA;
+    uint32_t u32BytesTillBoundary = pVBVA->cbData - offset;
+    uint8_t  *dst                 = &pVBVA->au8Data[offset];
+    int32_t i32Diff               = cb - u32BytesTillBoundary;
+
+    if (i32Diff <= 0)
+    {
+        /* Chunk will not cross buffer boundary. */
+        memcpy (dst, p, cb);
+    }
+    else
+    {
+        /* Chunk crosses buffer boundary. */
+        memcpy (dst, p, u32BytesTillBoundary);
+        memcpy (&pVBVA->au8Data[0], (uint8_t *)p + u32BytesTillBoundary, i32Diff);
+    }
+}
+
+static bool vboxHwBufferWrite(PVBVABUFFERCONTEXT pCtx,
+                              PHGSMIGUESTCOMMANDCONTEXT pHGSMICtx,
+                              const void *p, uint32_t cb)
+{
+    VBVARECORD *pRecord;
+    uint32_t cbHwBufferAvail;
+
+    uint32_t cbWritten = 0;
+
+    VBVABUFFER *pVBVA = pCtx->pVBVA;
+    Assert(pVBVA);
+
+    if (!pVBVA || pCtx->fHwBufferOverflow)
+    {
+        return false;
+    }
+
+    Assert(pVBVA->indexRecordFirst != pVBVA->indexRecordFree);
+
+    pRecord = pCtx->pRecord;
+    Assert(pRecord && (pRecord->cbRecord & VBVA_F_RECORD_PARTIAL));
+
+    // LogFunc(("%d\n", cb));
+
+    cbHwBufferAvail = vboxHwBufferAvail (pVBVA);
+
+    while (cb > 0)
+    {
+        uint32_t cbChunk = cb;
+
+        // LogFunc(("pVBVA->off32Free %d, pRecord->cbRecord 0x%08X, cbHwBufferAvail %d, cb %d, cbWritten %d\n",
+        //             pVBVA->off32Free, pRecord->cbRecord, cbHwBufferAvail, cb, cbWritten));
+
+        if (cbChunk >= cbHwBufferAvail)
+        {
+            // LogFunc(("1) avail %d, chunk %d\n", cbHwBufferAvail, cbChunk));
+
+            vboxHwBufferFlush (pHGSMICtx);
+
+            cbHwBufferAvail = vboxHwBufferAvail (pVBVA);
+
+            if (cbChunk >= cbHwBufferAvail)
+            {
+                // LogFunc(("no place for %d bytes. Only %d bytes available after flush. Going to partial writes.\n",
+                //             cb, cbHwBufferAvail));
+
+                if (cbHwBufferAvail <= pVBVA->cbPartialWriteThreshold)
+                {
+                    // LogFunc(("Buffer overflow!!!\n"));
+                    pCtx->fHwBufferOverflow = true;
+                    Assert(false);
+                    return false;
+                }
+
+                cbChunk = cbHwBufferAvail - pVBVA->cbPartialWriteThreshold;
+            }
+        }
+
+        Assert(cbChunk <= cb);
+        Assert(cbChunk <= vboxHwBufferAvail (pVBVA));
+
+        vboxHwBufferPlaceDataAt (pCtx, (uint8_t *)p + cbWritten, cbChunk, pVBVA->off32Free);
+
+        pVBVA->off32Free   = (pVBVA->off32Free + cbChunk) % pVBVA->cbData;
+        pRecord->cbRecord += cbChunk;
+        cbHwBufferAvail -= cbChunk;
+
+        cb        -= cbChunk;
+        cbWritten += cbChunk;
+    }
+
+    return true;
+}
+
+/*
+ * Public writer to the hardware buffer.
+ */
+DECLHIDDEN(bool) VBoxVBVAWrite(PVBVABUFFERCONTEXT pCtx,
+                               PHGSMIGUESTCOMMANDCONTEXT pHGSMICtx,
+                               const void *pv, uint32_t cb)
+{
+    return vboxHwBufferWrite (pCtx, pHGSMICtx, pv, cb);
+}
+
+DECLHIDDEN(bool) VBoxVBVAOrderSupported(PVBVABUFFERCONTEXT pCtx, unsigned code)
+{
+    VBVABUFFER *pVBVA = pCtx->pVBVA;
+
+    if (!pVBVA)
+    {
+        return false;
+    }
+
+    if (pVBVA->hostFlags.u32SupportedOrders & (1 << code))
+    {
+        return true;
+    }
+
+    return false;
+}
+
+DECLHIDDEN(void) VBoxVBVASetupBufferContext(PVBVABUFFERCONTEXT pCtx,
+                                            uint32_t offVRAMBuffer,
+                                            uint32_t cbBuffer)
+{
+    pCtx->offVRAMBuffer = offVRAMBuffer;
+    pCtx->cbBuffer      = cbBuffer;
+}