>From 1a33e5f2fa6de800047517a6f3251dc7191c97b5 Mon Sep 17 00:00:00 2001
From: Alon Levy <alevy@redhat.com>
Date: Wed, 16 Mar 2011 16:02:16 +0100
Subject: [PATCH 4/4] hw/qxl-render: drop cursor locks, replace with pipe
Switching locking protection of ds->cursor_set/cursor_move to moving
every call to these functions into the iothread and using the ssd->pipe
to transfer that, adding QXL_SERVER_CURSOR_SET, QXL_SERVER_CURSOR_MOVE.
This is tested with both -vnc :0 -spice and -sdl -spice.
---
hw/qxl-render.c | 25 +++++++++-----
hw/qxl.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++
hw/qxl.h | 4 ++
ui/spice-display.h | 13 +++++++-
4 files changed, 122 insertions(+), 10 deletions(-)
diff --git a/hw/qxl-render.c b/hw/qxl-render.c
index 58965e0..6759edb 100644
--- a/hw/qxl-render.c
+++ b/hw/qxl-render.c
@@ -178,7 +178,6 @@ fail:
return NULL;
}
-
/* called from spice server thread context only */
void qxl_render_cursor(PCIQXLDevice *qxl, QXLCommandExt *ext)
{
@@ -209,18 +208,26 @@ void qxl_render_cursor(PCIQXLDevice *qxl, QXLCommandExt *ext)
if (c == NULL) {
c = cursor_builtin_left_ptr();
}
- qemu_mutex_lock_iothread();
- qxl->ssd.ds->cursor_define(c);
- qxl->ssd.ds->mouse_set(x, y, 1);
- qemu_mutex_unlock_iothread();
- cursor_put(c);
+ qxl_server_request_cursor_set(qxl, c, x, y);
break;
case QXL_CURSOR_MOVE:
x = cmd->u.position.x;
y = cmd->u.position.y;
- qemu_mutex_lock_iothread();
- qxl->ssd.ds->mouse_set(x, y, 1);
- qemu_mutex_unlock_iothread();
+ qxl_server_request_cursor_move(qxl, x, y);
break;
}
}
+
+/* called from iothread only (via qxl.c:pipe_read) */
+void qxl_render_cursor_set(SimpleSpiceDisplay *ssd, QEMUCursor *c, int x, int y)
+{
+ ssd->ds->cursor_define(c);
+ ssd->ds->mouse_set(x, y, 1);
+ cursor_put(c);
+}
+
+/* called from iothread only (via qxl.c:pipe_read) */
+void qxl_render_cursor_move(SimpleSpiceDisplay *ssd, int x, int y)
+{
+ ssd->ds->mouse_set(x, y, 1);
+}
diff --git a/hw/qxl.c b/hw/qxl.c
index cf3c938..4c27deb 100644
--- a/hw/qxl.c
+++ b/hw/qxl.c
@@ -117,6 +117,27 @@ static QXLMode qxl_modes[] = {
#endif
};
+typedef struct __attribute__ ((__packed__)) {
+ QEMUCursor *c;
+ int x;
+ int y;
+} QXLServerCursorSet;
+
+typedef struct __attribute__ ((__packed__)) {
+ int x;
+ int y;
+} QXLServerCursorMove;
+
+typedef struct __attribute__ ((__packed__)) {
+ unsigned char req;
+ QXLServerCursorMove data;
+} QXLServerCursorMoveRequest;
+
+typedef struct __attribute__ ((__packed__)) {
+ unsigned char req;
+ QXLServerCursorSet data;
+} QXLServerCursorSetRequest;
+
static PCIQXLDevice *qxl0;
static void qxl_send_events(PCIQXLDevice *d, uint32_t events);
@@ -337,6 +358,33 @@ static void interface_get_init_info(QXLInstance *sin, QXLDevInitInfo *info)
}
/* called from spice server thread context only */
+void qxl_server_request_cursor_set(PCIQXLDevice *qxl, QEMUCursor *c, int x, int y)
+{
+ QXLServerCursorSetRequest req;
+ int r;
+
+ req.req = QXL_SERVER_CURSOR_SET;
+ req.data.c = c;
+ req.data.x = x;
+ req.data.y = y;
+ r = write(qxl->ssd.pipe[1], &req, sizeof(req));
+ assert(r == sizeof(req));
+}
+
+/* called from spice server thread context only */
+void qxl_server_request_cursor_move(PCIQXLDevice *qxl, int x, int y)
+{
+ QXLServerCursorMoveRequest req;
+ int r;
+
+ req.req = QXL_SERVER_CURSOR_MOVE;
+ req.data.x = x;
+ req.data.y = y;
+ r = write(qxl->ssd.pipe[1], &req, sizeof(req));
+ assert(r == sizeof(req));
+}
+
+/* called from spice server thread context only */
static int interface_get_command(QXLInstance *sin, struct QXLCommandExt *ext)
{
PCIQXLDevice *qxl = container_of(sin, PCIQXLDevice, ssd.qxl);
@@ -1055,12 +1103,37 @@ static void qxl_map(PCIDevice *pci, int region_num,
}
}
+static void read_bytes(int fd, void *buf, int len_requested)
+{
+ int len;
+ int total_len = 0;
+
+ do {
+ len = read(fd, buf, len_requested - total_len);
+ if (len < 0) {
+ if (errno == EINTR || errno == EAGAIN) {
+ continue;
+ }
+ perror("qxl: pipe_read: read failed");
+ /* will abort once it's out of the while loop */
+ break;
+ }
+ total_len += len;
+ buf = (uint8_t *)buf + len;
+ } while (total_len < len_requested);
+ assert(total_len == len_requested);
+}
+
static void pipe_read(void *opaque)
{
SimpleSpiceDisplay *ssd = opaque;
unsigned char cmd;
int len, set_irq = 0;
int create_update = 0;
+ int cursor_set = 0;
+ int cursor_move = 0;
+ QXLServerCursorSet cursor_set_data;
+ QXLServerCursorMove cursor_move_data;
while (1) {
cmd = 0;
@@ -1082,6 +1155,17 @@ static void pipe_read(void *opaque)
case QXL_SERVER_CREATE_UPDATE:
create_update = 1;
break;
+ case QXL_SERVER_CURSOR_SET:
+ if (cursor_set == 1) {
+ cursor_put(cursor_set_data.c);
+ }
+ cursor_set = 1;
+ read_bytes(ssd->pipe[0], &cursor_set_data, sizeof(cursor_set_data));
+ break;
+ case QXL_SERVER_CURSOR_MOVE:
+ cursor_move = 1;
+ read_bytes(ssd->pipe[0], &cursor_move_data, sizeof(cursor_move_data));
+ break;
default:
fprintf(stderr, "%s: unknown cmd %u\n", __FUNCTION__, cmd);
abort();
@@ -1099,6 +1183,12 @@ static void pipe_read(void *opaque)
if (set_irq) {
qxl_set_irq(container_of(ssd, PCIQXLDevice, ssd));
}
+ if (cursor_move) {
+ qxl_render_cursor_move(ssd, cursor_move_data.x, cursor_move_data.y);
+ }
+ if (cursor_set) {
+ qxl_render_cursor_set(ssd, cursor_set_data.c, cursor_set_data.x, cursor_set_data.y);
+ }
}
static void qxl_send_events(PCIQXLDevice *d, uint32_t events)
diff --git a/hw/qxl.h b/hw/qxl.h
index 701245f..f4f99ec 100644
--- a/hw/qxl.h
+++ b/hw/qxl.h
@@ -93,6 +93,8 @@ typedef struct PCIQXLDevice {
/* qxl.c */
void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL phys, int group_id);
+void qxl_server_request_cursor_set(PCIQXLDevice *qxl, QEMUCursor *c, int x, int y);
+void qxl_server_request_cursor_move(PCIQXLDevice *qxl, int x, int y);
/* qxl-logger.c */
void qxl_log_cmd_cursor(PCIQXLDevice *qxl, QXLCursorCmd *cmd, int group_id);
@@ -102,3 +104,5 @@ void qxl_log_command(PCIQXLDevice *qxl, const char *ring, QXLCommandExt *ext);
void qxl_render_resize(PCIQXLDevice *qxl);
void qxl_render_update(PCIQXLDevice *qxl);
void qxl_render_cursor(PCIQXLDevice *qxl, QXLCommandExt *ext);
+void qxl_render_cursor_set(SimpleSpiceDisplay *ssd, QEMUCursor *c, int x, int y);
+void qxl_render_cursor_move(SimpleSpiceDisplay *ssd, int x, int y);
diff --git a/ui/spice-display.h b/ui/spice-display.h
index 2be6a34..bbfd689 100644
--- a/ui/spice-display.h
+++ b/ui/spice-display.h
@@ -31,11 +31,22 @@
#define NUM_SURFACES 1024
-/* For commands/requests from server thread to iothread */
+/*
+ * Commands/requests from server thread to iothread.
+ * Note that CREATE_UPDATE is used both with qxl and without it (spice-display)
+ * the others are only used with the qxl device.
+ *
+ * SET_IRQ - just the request is sent (1 byte)
+ * CREATE_UPDATE - jus the request is sent (1 byte)
+ * CURSOR_SET - send QXLServerRequestCursorSet
+ * CURSOR_MOVE - send QXLServerRequestCursorMove
+ */
#define QXL_EMPTY_UPDATE ((void *)-1)
enum {
QXL_SERVER_SET_IRQ = 1,
QXL_SERVER_CREATE_UPDATE,
+ QXL_SERVER_CURSOR_SET,
+ QXL_SERVER_CURSOR_MOVE
};
struct SimpleSpiceUpdate;
--
1.7.3.2