[PATCH v2 5/5] OvmfPkg: simply use the Bochs interface for vmsvga

[yuchenlin@synology.com]

From: yuchenlin <yuchenlin@synology.com>

BAR  |    std vga     |  vmsvga
---------------------------------
0    |   Framebuffer  | I/O space
1    |   Reserved     | Framebuffer
2    |   MMIO         | FIFO

Because of the PCI BARs difference between std vga and
vmsvga, we can not simply recognize the "QEMU VMWare SVGA"
as the QEMU_VIDEO_BOCHS_MMIO variant.

Instead, we remain variant QEMU_VIDEO_VMWARE_SVGA, and use
it for:

(1) Get framebuffer from correct PCI BAR
(2) Prevent using BAR2 for MMIO

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: yuchenlin <yuchenlin@synology.com>
---
 OvmfPkg/QemuVideoDxe/Driver.c | 18 ++++++++++++++++--
 OvmfPkg/QemuVideoDxe/Gop.c    |  3 ++-
 OvmfPkg/QemuVideoDxe/Qemu.h   |  2 ++
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/OvmfPkg/QemuVideoDxe/Driver.c b/OvmfPkg/QemuVideoDxe/Driver.c
index 2304afd1e6..76d4a2d27e 100644
--- a/OvmfPkg/QemuVideoDxe/Driver.c
+++ b/OvmfPkg/QemuVideoDxe/Driver.c
@@ -69,6 +69,12 @@ QEMU_VIDEO_CARD gQemuVideoCardList[] = {
         0x1050,
         QEMU_VIDEO_BOCHS_MMIO,
         L"QEMU VirtIO VGA"
+    },{
+        PCI_CLASS_DISPLAY_VGA,
+        0x15ad,
+        0x0405,
+        QEMU_VIDEO_VMWARE_SVGA,
+        L"QEMU VMWare SVGA"
     },{
         0 /* end of list */
     }
@@ -256,6 +262,12 @@ QemuVideoControllerDriverStart (
     goto ClosePciIo;
   }
   Private->Variant = Card->Variant;
+  if (Private->Variant == QEMU_VIDEO_VMWARE_SVGA) {
+    Private->FrameBufferVramBarIndex = PCI_BAR_IDX1;
+  } else {
+    Private->FrameBufferVramBarIndex = PCI_BAR_IDX0;
+  }
+
 
   //
   // IsQxl is based on the detected Card->Variant, which at a later point might
@@ -320,7 +332,8 @@ QemuVideoControllerDriverStart (
   // Check if accessing the bochs interface works.
   //
   if (Private->Variant == QEMU_VIDEO_BOCHS_MMIO ||
-      Private->Variant == QEMU_VIDEO_BOCHS) {
+      Private->Variant == QEMU_VIDEO_BOCHS ||
+      Private->Variant == QEMU_VIDEO_VMWARE_SVGA) {
     UINT16 BochsId;
     BochsId = BochsRead(Private, VBE_DISPI_INDEX_ID);
     if ((BochsId & 0xFFF0) != VBE_DISPI_ID0) {
@@ -383,6 +396,7 @@ QemuVideoControllerDriverStart (
     break;
   case QEMU_VIDEO_BOCHS_MMIO:
   case QEMU_VIDEO_BOCHS:
+  case QEMU_VIDEO_VMWARE_SVGA:
     Status = QemuVideoBochsModeSetup (Private, IsQxl);
     break;
   default:
@@ -764,7 +778,7 @@ ClearScreen (
   Private->PciIo->Mem.Write (
                         Private->PciIo,
                         EfiPciIoWidthFillUint32,
-                        0,
+                        Private->FrameBufferVramBarIndex,
                         0,
                         0x400000 >> 2,
                         &Color
diff --git a/OvmfPkg/QemuVideoDxe/Gop.c b/OvmfPkg/QemuVideoDxe/Gop.c
index d490fa7a2e..3abc5eeb36 100644
--- a/OvmfPkg/QemuVideoDxe/Gop.c
+++ b/OvmfPkg/QemuVideoDxe/Gop.c
@@ -60,7 +60,7 @@ QemuVideoCompleteModeData (
 
   Private->PciIo->GetBarAttributes (
                         Private->PciIo,
-                        0,
+                        Private->FrameBufferVramBarIndex,
                         NULL,
                         (VOID**) &FrameBufDesc
                         );
@@ -177,6 +177,7 @@ Routine Description:
     break;
   case QEMU_VIDEO_BOCHS_MMIO:
   case QEMU_VIDEO_BOCHS:
+  case QEMU_VIDEO_VMWARE_SVGA:
     InitializeBochsGraphicsMode (Private, &QemuVideoBochsModes[ModeData->InternalModeIndex]);
     break;
   default:
diff --git a/OvmfPkg/QemuVideoDxe/Qemu.h b/OvmfPkg/QemuVideoDxe/Qemu.h
index d7da761705..3aac9eeca6 100644
--- a/OvmfPkg/QemuVideoDxe/Qemu.h
+++ b/OvmfPkg/QemuVideoDxe/Qemu.h
@@ -92,6 +92,7 @@ typedef enum {
   QEMU_VIDEO_CIRRUS_5446,
   QEMU_VIDEO_BOCHS,
   QEMU_VIDEO_BOCHS_MMIO,
+  QEMU_VIDEO_VMWARE_SVGA,
 } QEMU_VIDEO_VARIANT;
 
 typedef struct {
@@ -120,6 +121,7 @@ typedef struct {
   QEMU_VIDEO_VARIANT                    Variant;
   FRAME_BUFFER_CONFIGURE                *FrameBufferBltConfigure;
   UINTN                                 FrameBufferBltConfigureSize;
+  UINT8                                 FrameBufferVramBarIndex;
 } QEMU_VIDEO_PRIVATE_DATA;
 
 ///
-- 
2.18.0