From 9588d67e72f853349dbb318503368ad01b12feb6 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 13 Mar 2018 11:17:29 -0600 Subject: [PATCH] console: minimal hotplug suport This patch allows to unbind devices from QemuConsoles, using the new graphic_console_close() function. The QemuConsole will show a static display then, saying the device was unplugged. When re-plugging a display later on the QemuConsole will be reused. Eventually we will allocate and release QemuConsoles dynamically at some point in the future, that'll need more infrastructure though to notify user interfaces (gtk, sdl, spice, ...) about QemuConsoles coming and going. Signed-off-by: Gerd Hoffmann Signed-off-by: Alex Williamson --- include/ui/console.h | 2 ++ ui/console.c | 79 ++++++++++++++++++++++++++++++++++++++++---- ui/trace-events | 2 ++ 3 files changed, 77 insertions(+), 6 deletions(-) diff --git a/include/ui/console.h b/include/ui/console.h index 5fca9afcbc..6d2c052068 100644 --- a/include/ui/console.h +++ b/include/ui/console.h @@ -386,6 +386,7 @@ QemuConsole *graphic_console_init(DeviceState *dev, uint32_t head, void graphic_console_set_hwops(QemuConsole *con, const GraphicHwOps *hw_ops, void *opaque); +void graphic_console_close(QemuConsole *con); void graphic_hw_update(QemuConsole *con); void graphic_hw_invalidate(QemuConsole *con); @@ -398,6 +399,7 @@ QemuConsole *qemu_console_lookup_by_index(unsigned int index); QemuConsole *qemu_console_lookup_by_device(DeviceState *dev, uint32_t head); QemuConsole *qemu_console_lookup_by_device_name(const char *device_id, uint32_t head, Error **errp); +QemuConsole *qemu_console_lookup_unused(void); bool qemu_console_is_visible(QemuConsole *con); bool qemu_console_is_graphic(QemuConsole *con); bool qemu_console_is_fixedsize(QemuConsole *con); diff --git a/ui/console.c b/ui/console.c index a8868fc04f..530a491987 100644 --- a/ui/console.c +++ b/ui/console.c @@ -1282,11 +1282,16 @@ static QemuConsole *new_console(DisplayState *ds, console_type_t console_type, s->console_type = console_type; consoles = g_realloc(consoles, sizeof(*consoles) * (nb_consoles+1)); - if (console_type != GRAPHIC_CONSOLE) { + if (console_type != GRAPHIC_CONSOLE || qdev_hotplug) { s->index = nb_consoles; consoles[nb_consoles++] = s; } else { - /* HACK: Put graphical consoles before text consoles. */ + /* + * HACK: Put graphical consoles before text consoles. + * + * Only do that for coldplugged devices. After initial device + * initialization we will not renumber the consoles any more. + */ for (i = nb_consoles; i > 0; i--) { if (consoles[i - 1]->console_type == GRAPHIC_CONSOLE) break; @@ -1874,21 +1879,61 @@ QemuConsole *graphic_console_init(DeviceState *dev, uint32_t head, int height = 480; QemuConsole *s; DisplayState *ds; + DisplaySurface *surface; ds = get_alloc_displaystate(); - trace_console_gfx_new(); - s = new_console(ds, GRAPHIC_CONSOLE, head); - s->ui_timer = timer_new_ms(QEMU_CLOCK_REALTIME, dpy_set_ui_info_timer, s); + s = qemu_console_lookup_unused(); + if (s) { + trace_console_gfx_reuse(s->index); + if (s->surface) { + width = surface_width(s->surface); + height = surface_height(s->surface); + } + } else { + trace_console_gfx_new(); + s = new_console(ds, GRAPHIC_CONSOLE, head); + s->ui_timer = timer_new_ms(QEMU_CLOCK_REALTIME, + dpy_set_ui_info_timer, s); + } graphic_console_set_hwops(s, hw_ops, opaque); if (dev) { object_property_set_link(OBJECT(s), OBJECT(dev), "device", &error_abort); } - s->surface = qemu_create_message_surface(width, height, noinit); + surface = qemu_create_message_surface(width, height, noinit); + dpy_gfx_replace_surface(s, surface); return s; } +static const GraphicHwOps unused_ops = { + /* no callbacks */ +}; + +void graphic_console_close(QemuConsole *con) +{ + static const char unplugged[] = + "Guest display has been unplugged"; + DisplaySurface *surface; + int width = 640; + int height = 480; + + if (con->surface) { + width = surface_width(con->surface); + height = surface_height(con->surface); + } + + trace_console_gfx_close(con->index); + object_property_set_link(OBJECT(con), NULL, "device", &error_abort); + graphic_console_set_hwops(con, &unused_ops, NULL); + + if (con->gl) { + dpy_gl_scanout_disable(con); + } + surface = qemu_create_message_surface(width, height, unplugged); + dpy_gfx_replace_surface(con, surface); +} + QemuConsole *qemu_console_lookup_by_index(unsigned int index) { if (index >= nb_consoles) { @@ -1945,6 +1990,28 @@ QemuConsole *qemu_console_lookup_by_device_name(const char *device_id, return con; } +QemuConsole *qemu_console_lookup_unused(void) +{ + Object *obj; + int i; + + for (i = 0; i < nb_consoles; i++) { + if (!consoles[i]) { + continue; + } + if (consoles[i]->hw_ops != &unused_ops) { + continue; + } + obj = object_property_get_link(OBJECT(consoles[i]), + "device", &error_abort); + if (obj != NULL) { + continue; + } + return consoles[i]; + } + return NULL; +} + bool qemu_console_is_visible(QemuConsole *con) { return (con == active_console) || (con->dcls > 0); diff --git a/ui/trace-events b/ui/trace-events index a957f363f1..eb4bf7f00d 100644 --- a/ui/trace-events +++ b/ui/trace-events @@ -2,6 +2,8 @@ # ui/console.c console_gfx_new(void) "" +console_gfx_reuse(int index) "%d" +console_gfx_close(int index) "%d" console_putchar_csi(int esc_param0, int esc_param1, int ch, int nb_esc_params) "escape sequence CSI%d;%d%c, %d parameters" console_putchar_unhandled(int ch) "unhandled escape character '%c'" console_txt_new(int w, int h) "%dx%d"