diff options
Diffstat (limited to 'ui')
| -rw-r--r-- | ui/console.c | 47 | ||||
| -rw-r--r-- | ui/trace-events | 2 |
2 files changed, 38 insertions, 11 deletions
diff --git a/ui/console.c b/ui/console.c index 820e408..e8e5970 100644 --- a/ui/console.c +++ b/ui/console.c @@ -168,6 +168,7 @@ struct QemuConsole { QEMUFIFO out_fifo; uint8_t out_fifo_buf[16]; QEMUTimer *kbd_timer; + CoQueue dump_queue; QTAILQ_ENTRY(QemuConsole) next; }; @@ -195,7 +196,6 @@ static void dpy_refresh(DisplayState *s); static DisplayState *get_alloc_displaystate(void); static void text_console_update_cursor_timer(void); static void text_console_update_cursor(void *opaque); -static bool ppm_save(int fd, DisplaySurface *ds, Error **errp); static void gui_update(void *opaque) { @@ -264,6 +264,7 @@ static void gui_setup_refresh(DisplayState *ds) void graphic_hw_update_done(QemuConsole *con) { + qemu_co_queue_restart_all(&con->dump_queue); } void graphic_hw_update(QemuConsole *con) @@ -311,16 +312,16 @@ void graphic_hw_invalidate(QemuConsole *con) } } -static bool ppm_save(int fd, DisplaySurface *ds, Error **errp) +static bool ppm_save(int fd, pixman_image_t *image, Error **errp) { - int width = pixman_image_get_width(ds->image); - int height = pixman_image_get_height(ds->image); + int width = pixman_image_get_width(image); + int height = pixman_image_get_height(image); g_autoptr(Object) ioc = OBJECT(qio_channel_file_new_fd(fd)); g_autofree char *header = NULL; g_autoptr(pixman_image_t) linebuf = NULL; int y; - trace_ppm_save(fd, ds); + trace_ppm_save(fd, image); header = g_strdup_printf("P6\n%d %d\n%d\n", width, height, 255); if (qio_channel_write_all(QIO_CHANNEL(ioc), @@ -330,7 +331,7 @@ static bool ppm_save(int fd, DisplaySurface *ds, Error **errp) linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, width); for (y = 0; y < height; y++) { - qemu_pixman_linebuf_fill(linebuf, ds->image, width, 0, y); + qemu_pixman_linebuf_fill(linebuf, image, width, 0, y); if (qio_channel_write_all(QIO_CHANNEL(ioc), (char *)pixman_image_get_data(linebuf), pixman_image_get_stride(linebuf), errp) < 0) { @@ -341,9 +342,17 @@ static bool ppm_save(int fd, DisplaySurface *ds, Error **errp) return true; } -void qmp_screendump(const char *filename, bool has_device, const char *device, - bool has_head, int64_t head, Error **errp) +static void graphic_hw_update_bh(void *con) { + graphic_hw_update(con); +} + +/* Safety: coroutine-only, concurrent-coroutine safe, main thread only */ +void coroutine_fn +qmp_screendump(const char *filename, bool has_device, const char *device, + bool has_head, int64_t head, Error **errp) +{ + g_autoptr(pixman_image_t) image = NULL; QemuConsole *con; DisplaySurface *surface; int fd; @@ -366,12 +375,24 @@ void qmp_screendump(const char *filename, bool has_device, const char *device, } } - graphic_hw_update(con); + if (qemu_co_queue_empty(&con->dump_queue)) { + /* Defer the update, it will restart the pending coroutines */ + aio_bh_schedule_oneshot(qemu_get_aio_context(), + graphic_hw_update_bh, con); + } + qemu_co_queue_wait(&con->dump_queue, NULL); + + /* + * All pending coroutines are woken up, while the BQL is held. No + * further graphic update are possible until it is released. Take + * an image ref before that. + */ surface = qemu_console_surface(con); if (!surface) { error_setg(errp, "no surface"); return; } + image = pixman_image_ref(surface->image); fd = qemu_open_old(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666); if (fd == -1) { @@ -380,7 +401,12 @@ void qmp_screendump(const char *filename, bool has_device, const char *device, return; } - if (!ppm_save(fd, surface, errp)) { + /* + * The image content could potentially be updated as the coroutine + * yields and releases the BQL. It could produce corrupted dump, but + * it should be otherwise safe. + */ + if (!ppm_save(fd, image, errp)) { qemu_unlink(filename); } } @@ -1296,6 +1322,7 @@ static QemuConsole *new_console(DisplayState *ds, console_type_t console_type, obj = object_new(TYPE_QEMU_CONSOLE); s = QEMU_CONSOLE(obj); + qemu_co_queue_init(&s->dump_queue); s->head = head; object_property_add_link(obj, "device", TYPE_DEVICE, (Object **)&s->device, diff --git a/ui/trace-events b/ui/trace-events index b7d7270..0ffcdb4 100644 --- a/ui/trace-events +++ b/ui/trace-events @@ -15,7 +15,7 @@ displaysurface_create_pixman(void *display_surface) "surface=%p" displaysurface_free(void *display_surface) "surface=%p" displaychangelistener_register(void *dcl, const char *name) "%p [ %s ]" displaychangelistener_unregister(void *dcl, const char *name) "%p [ %s ]" -ppm_save(int fd, void *display_surface) "fd=%d surface=%p" +ppm_save(int fd, void *image) "fd=%d image=%p" # gtk-egl.c # gtk-gl-area.c |