[Qemu-devel] [PATCH 3/3] vmware_vga: Allow simple drivers to work without using the fifo

[BALATON Zoltan <balaton@eik.bme.hu>]

Postpone stopping the dirty log to the point where the command fifo is
configured to allow drivers which don't use the fifo to work too.
(Without this the picture rendered into the vram never got to the
screen and the DIRECT_VRAM option meant to support this case was
removed a year ago.)

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
  hw/vga.c        |    2 +-
  hw/vga_int.h    |    1 +
  hw/vmware_vga.c |   34 +++++++++++++++++++++++++---------
  3 files changed, 27 insertions(+), 10 deletions(-)

  Split up version of previous [PATCH] vmware_vga: Cleanup and allow
  simple drivers to work without the fifo

diff --git a/hw/vga.c b/hw/vga.c
index f82ced8..7e6dc41 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -1611,7 +1611,7 @@ void vga_invalidate_scanlines(VGACommonState *s, int y1, int y2)
      }
  }

-static void vga_sync_dirty_bitmap(VGACommonState *s)
+void vga_sync_dirty_bitmap(VGACommonState *s)
  {
      memory_region_sync_dirty_bitmap(&s->vram);
  }
diff --git a/hw/vga_int.h b/hw/vga_int.h
index 8938093..16d53ef 100644
--- a/hw/vga_int.h
+++ b/hw/vga_int.h
@@ -195,6 +195,7 @@ MemoryRegion *vga_init_io(VGACommonState *s,
                            const MemoryRegionPortio **vbe_ports);
  void vga_common_reset(VGACommonState *s);

+void vga_sync_dirty_bitmap(VGACommonState *s);
  void vga_dirty_log_start(VGACommonState *s);
  void vga_dirty_log_stop(VGACommonState *s);

diff --git a/hw/vmware_vga.c b/hw/vmware_vga.c
index 3c4beb9..2b77766 100644
--- a/hw/vmware_vga.c
+++ b/hw/vmware_vga.c
@@ -820,11 +820,10 @@ static void vmsvga_value_write(void *opaque, uint32_t address, uint32_t value)
          break;

      case SVGA_REG_ENABLE:
-        s->enable = value;
-        s->config &= !!value;
+        s->enable = !!value;
          s->invalidated = 1;
          s->vga.invalidate(&s->vga);
-        if (s->enable) {
+        if (s->enable && s->config) {
              vga_dirty_log_stop(&s->vga);
          } else {
              vga_dirty_log_start(&s->vga);
@@ -860,15 +859,19 @@ static void vmsvga_value_write(void *opaque, uint32_t address, uint32_t value)
          if (value) {
              s->fifo = (uint32_t *) s->fifo_ptr;
              /* Check range and alignment.  */
-            if ((CMD(min) | CMD(max) |
-                        CMD(next_cmd) | CMD(stop)) & 3)
+            if ((CMD(min) | CMD(max) | CMD(next_cmd) | CMD(stop)) & 3) {
                  break;
-            if (CMD(min) < (uint8_t *) s->cmd->fifo - (uint8_t *) s->fifo)
+            }
+            if (CMD(min) < (uint8_t *) s->cmd->fifo - (uint8_t *) s->fifo) {
                  break;
-            if (CMD(max) > SVGA_FIFO_SIZE)
+            }
+            if (CMD(max) > SVGA_FIFO_SIZE) {
                  break;
-            if (CMD(max) < CMD(min) + 10 * 1024)
+            }
+            if (CMD(max) < CMD(min) + 10 * 1024) {
                  break;
+            }
+            vga_dirty_log_stop(&s->vga);
          }
          s->config = !!value;
          break;
@@ -949,6 +952,8 @@ static inline void vmsvga_check_size(struct vmsvga_state_s *s)
  static void vmsvga_update_display(void *opaque)
  {
      struct vmsvga_state_s *s = opaque;
+    bool dirty = false;
+
      if (!s->enable) {
          s->vga.update(&s->vga);
          return;
@@ -963,13 +968,24 @@ static void vmsvga_update_display(void *opaque)
       * Is it more efficient to look at vram VGA-dirty bits or wait
       * for the driver to issue SVGA_CMD_UPDATE?
       */
-    if (s->invalidated) {
+    if (memory_region_is_logging(&s->vga.vram)) {
+        vga_sync_dirty_bitmap(&s->vga);
+        dirty = memory_region_get_dirty(&s->vga.vram, 0,
+            ds_get_linesize(s->vga.ds) * ds_get_height(s->vga.ds),
+            DIRTY_MEMORY_VGA);
+    }
+    if (s->invalidated || dirty) {
          s->invalidated = 0;
          memcpy(ds_get_data(s->vga.ds), s->vga.vram_ptr,
                 ds_get_linesize(s->vga.ds) * ds_get_height(s->vga.ds));
          dpy_update(s->vga.ds, 0, 0,
                 ds_get_width(s->vga.ds), ds_get_height(s->vga.ds));
      }
+    if (dirty) {
+        memory_region_reset_dirty(&s->vga.vram, 0,
+            ds_get_linesize(s->vga.ds) * ds_get_height(s->vga.ds),
+            DIRTY_MEMORY_VGA);
+    }
  }

  static void vmsvga_reset(DeviceState *dev)
-- 
1.7.10