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sm501: make display updates thread safe 

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20170509111928.30935-1-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2017-05-09 13:19:28 +02:00
parent 2dd285b5f3
commit ca7f544123
1 changed files with 7 additions and 20 deletions
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27
hw/display/sm501.c
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@ -1414,6 +1414,7 @@ static void sm501_update_display(void *opaque)
{
SM501State *s = (SM501State *)opaque;
DisplaySurface *surface = qemu_console_surface(s->con);
DirtyBitmapSnapshot *snap;
int y, c_x = 0, c_y = 0;
int crt = (s->dc_crt_control & SM501_DC_CRT_CONTROL_SEL) ? 1 : 0;
int width = get_width(s, crt);
@ -1425,9 +1426,7 @@ static void sm501_update_display(void *opaque)
draw_hwc_line_func *draw_hwc_line = NULL;
int full_update = 0;
int y_start = -1;
ram_addr_t page_min = ~0l;
ram_addr_t page_max = 0l;
ram_addr_t offset;
ram_addr_t offset = 0;
uint32_t *palette;
uint8_t hwc_palette[3 * 3];
uint8_t *hwc_src = NULL;
@ -1479,17 +1478,17 @@ static void sm501_update_display(void *opaque)
/* draw each line according to conditions */
memory_region_sync_dirty_bitmap(&s->local_mem_region);
snap = memory_region_snapshot_and_clear_dirty(&s->local_mem_region,
offset, width * height * src_bpp, DIRTY_MEMORY_VGA);
for (y = 0, offset = 0; y < height; y++, offset += width * src_bpp) {
int update, update_hwc;
ram_addr_t page0 = offset;
ram_addr_t page1 = offset + width * src_bpp - 1;
/* check if hardware cursor is enabled and we're within its range */
update_hwc = draw_hwc_line && c_y <= y && y < c_y + SM501_HWC_HEIGHT;
update = full_update || update_hwc;
/* check dirty flags for each line */
update |= memory_region_get_dirty(&s->local_mem_region, page0,
page1 - page0, DIRTY_MEMORY_VGA);
update |= memory_region_snapshot_get_dirty(&s->local_mem_region, snap,
offset, width * src_bpp);
/* draw line and change status */
if (update) {
@ -1507,12 +1506,6 @@ static void sm501_update_display(void *opaque)
if (y_start < 0) {
y_start = y;
}
if (page0 < page_min) {
page_min = page0;
}
if (page1 > page_max) {
page_max = page1;
}
} else {
if (y_start >= 0) {
/* flush to display */
@ -1521,18 +1514,12 @@ static void sm501_update_display(void *opaque)
}
}
}
g_free(snap);
/* complete flush to display */
if (y_start >= 0) {
dpy_gfx_update(s->con, 0, y_start, width, y - y_start);
}
/* clear dirty flags */
if (page_min != ~0l) {
memory_region_reset_dirty(&s->local_mem_region,
page_min, page_max + TARGET_PAGE_SIZE,
DIRTY_MEMORY_VGA);
}
}
static const GraphicHwOps sm501_ops = {