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From 93f01916f0c1e11f38edb8ccc4118c940d9c089f Mon Sep 17 00:00:00 2001
From: eillon <yezhenyu2@huawei.com>
Date: Tue, 8 Feb 2022 22:43:59 -0500
Subject: [PATCH] hw/usb: reduce the vpcu cost of UHCI when VNC disconnect
Reduce the vpcu cost by set a lower FRAME_TIMER_FREQ of the UHCI
when VNC client disconnected. This can reduce about 3% cost of
vcpu thread.
Signed-off-by: eillon <yezhenyu2@huawei.com>
---
hw/usb/core.c | 5 ++--
hw/usb/desc.c | 7 +++--
hw/usb/dev-hid.c | 2 +-
hw/usb/hcd-uhci.c | 63 ++++++++++++++++++++++++++++++++++------
hw/usb/hcd-uhci.h | 1 +
hw/usb/host-libusb.c | 32 ++++++++++++++++++++
include/hw/usb.h | 1 +
include/qemu/timer.h | 28 ++++++++++++++++++
ui/vnc.c | 4 +++
util/qemu-timer.c | 69 ++++++++++++++++++++++++++++++++++++++++++++
10 files changed, 197 insertions(+), 15 deletions(-)
diff --git a/hw/usb/core.c b/hw/usb/core.c
index 975f76250a..51b36126ca 100644
--- a/hw/usb/core.c
+++ b/hw/usb/core.c
@@ -87,7 +87,7 @@ void usb_device_reset(USBDevice *dev)
return;
}
usb_device_handle_reset(dev);
- dev->remote_wakeup = 0;
+ dev->remote_wakeup &= ~USB_DEVICE_REMOTE_WAKEUP;
dev->addr = 0;
dev->state = USB_STATE_DEFAULT;
}
@@ -105,7 +105,8 @@ void usb_wakeup(USBEndpoint *ep, unsigned int stream)
*/
return;
}
- if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) {
+ if ((dev->remote_wakeup & USB_DEVICE_REMOTE_WAKEUP)
+ && dev->port && dev->port->ops->wakeup) {
dev->port->ops->wakeup(dev->port);
}
if (bus->ops->wakeup_endpoint) {
diff --git a/hw/usb/desc.c b/hw/usb/desc.c
index 8b6eaea407..78bbe74c71 100644
--- a/hw/usb/desc.c
+++ b/hw/usb/desc.c
@@ -751,7 +751,7 @@ int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
if (config->bmAttributes & USB_CFG_ATT_SELFPOWER) {
data[0] |= 1 << USB_DEVICE_SELF_POWERED;
}
- if (dev->remote_wakeup) {
+ if (dev->remote_wakeup & USB_DEVICE_REMOTE_WAKEUP) {
data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP;
}
data[1] = 0x00;
@@ -761,14 +761,15 @@ int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
}
case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
if (value == USB_DEVICE_REMOTE_WAKEUP) {
- dev->remote_wakeup = 0;
+ dev->remote_wakeup &= ~USB_DEVICE_REMOTE_WAKEUP;
ret = 0;
}
trace_usb_clear_device_feature(dev->addr, value, ret);
break;
case DeviceOutRequest | USB_REQ_SET_FEATURE:
+ dev->remote_wakeup |= USB_DEVICE_REMOTE_WAKEUP_IS_SUPPORTED;
if (value == USB_DEVICE_REMOTE_WAKEUP) {
- dev->remote_wakeup = 1;
+ dev->remote_wakeup |= USB_DEVICE_REMOTE_WAKEUP;
ret = 0;
}
trace_usb_set_device_feature(dev->addr, value, ret);
diff --git a/hw/usb/dev-hid.c b/hw/usb/dev-hid.c
index 1c7ae97c30..9fb89f6955 100644
--- a/hw/usb/dev-hid.c
+++ b/hw/usb/dev-hid.c
@@ -745,7 +745,7 @@ static int usb_ptr_post_load(void *opaque, int version_id)
{
USBHIDState *s = opaque;
- if (s->dev.remote_wakeup) {
+ if (s->dev.remote_wakeup & USB_DEVICE_REMOTE_WAKEUP) {
hid_pointer_activate(&s->hid);
}
return 0;
diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index d1b5657d72..693c68f445 100644
--- a/hw/usb/hcd-uhci.c
+++ b/hw/usb/hcd-uhci.c
@@ -44,6 +44,8 @@
#include "hcd-uhci.h"
#define FRAME_TIMER_FREQ 1000
+#define FRAME_TIMER_FREQ_LAZY 10
+#define USB_DEVICE_NEED_NORMAL_FREQ "QEMU USB Tablet"
#define FRAME_MAX_LOOPS 256
@@ -111,6 +113,22 @@ static void uhci_async_cancel(UHCIAsync *async);
static void uhci_queue_fill(UHCIQueue *q, UHCI_TD *td);
static void uhci_resume(void *opaque);
+static int64_t uhci_frame_timer_freq = FRAME_TIMER_FREQ_LAZY;
+
+static void uhci_set_frame_freq(int freq)
+{
+ if (freq <= 0) {
+ return;
+ }
+
+ uhci_frame_timer_freq = freq;
+}
+
+static qemu_usb_controller qemu_uhci = {
+ .name = "uhci",
+ .qemu_set_freq = uhci_set_frame_freq,
+};
+
static inline int32_t uhci_queue_token(UHCI_TD *td)
{
if ((td->token & (0xf << 15)) == 0) {
@@ -353,7 +371,7 @@ static int uhci_post_load(void *opaque, int version_id)
if (version_id < 2) {
s->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
- (NANOSECONDS_PER_SECOND / FRAME_TIMER_FREQ);
+ (NANOSECONDS_PER_SECOND / uhci_frame_timer_freq);
}
return 0;
}
@@ -394,8 +412,29 @@ static void uhci_port_write(void *opaque, hwaddr addr,
if ((val & UHCI_CMD_RS) && !(s->cmd & UHCI_CMD_RS)) {
/* start frame processing */
trace_usb_uhci_schedule_start();
- s->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
- (NANOSECONDS_PER_SECOND / FRAME_TIMER_FREQ);
+
+ /*
+ * If the frequency of frame_timer is too slow, Guest OS (Win2012) would become
+ * blue-screen after hotplugging some vcpus.
+ * If this USB device support the remote-wakeup, the UHCI controller
+ * will enter global suspend mode when there is no input for several seconds.
+ * In this case, Qemu will delete the frame_timer. Since the frame_timer has been deleted,
+ * there is no influence to the performance of Vms. So, we can change the frequency to 1000.
+ * After that the frequency will be safe when we trigger the frame_timer again.
+ * Excepting this, there are two ways to change the frequency:
+ * 1)VNC connect/disconnect;2)attach/detach USB device.
+ */
+ if ((uhci_frame_timer_freq != FRAME_TIMER_FREQ)
+ && (s->ports[0].port.dev)
+ && (!memcmp(s->ports[0].port.dev->product_desc,
+ USB_DEVICE_NEED_NORMAL_FREQ, strlen(USB_DEVICE_NEED_NORMAL_FREQ)))
+ && (s->ports[0].port.dev->remote_wakeup & USB_DEVICE_REMOTE_WAKEUP_IS_SUPPORTED)) {
+ qemu_log("turn up the frequency of UHCI controller to %d\n", FRAME_TIMER_FREQ);
+ uhci_frame_timer_freq = FRAME_TIMER_FREQ;
+ }
+
+ s->frame_time = NANOSECONDS_PER_SECOND / FRAME_TIMER_FREQ;
+ s->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->frame_time;
timer_mod(s->frame_timer, s->expire_time);
s->status &= ~UHCI_STS_HCHALTED;
} else if (!(val & UHCI_CMD_RS)) {
@@ -1083,7 +1122,6 @@ static void uhci_frame_timer(void *opaque)
UHCIState *s = opaque;
uint64_t t_now, t_last_run;
int i, frames;
- const uint64_t frame_t = NANOSECONDS_PER_SECOND / FRAME_TIMER_FREQ;
s->completions_only = false;
qemu_bh_cancel(s->bh);
@@ -1099,14 +1137,14 @@ static void uhci_frame_timer(void *opaque)
}
/* We still store expire_time in our state, for migration */
- t_last_run = s->expire_time - frame_t;
+ t_last_run = s->expire_time - s->frame_time;
t_now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
/* Process up to MAX_FRAMES_PER_TICK frames */
- frames = (t_now - t_last_run) / frame_t;
+ frames = (t_now - t_last_run) / s->frame_time;
if (frames > s->maxframes) {
int skipped = frames - s->maxframes;
- s->expire_time += skipped * frame_t;
+ s->expire_time += skipped * s->frame_time;
s->frnum = (s->frnum + skipped) & 0x7ff;
frames -= skipped;
}
@@ -1123,7 +1161,7 @@ static void uhci_frame_timer(void *opaque)
/* The spec says frnum is the frame currently being processed, and
* the guest must look at frnum - 1 on interrupt, so inc frnum now */
s->frnum = (s->frnum + 1) & 0x7ff;
- s->expire_time += frame_t;
+ s->expire_time += s->frame_time;
}
/* Complete the previous frame(s) */
@@ -1134,7 +1172,12 @@ static void uhci_frame_timer(void *opaque)
}
s->pending_int_mask = 0;
- timer_mod(s->frame_timer, t_now + frame_t);
+ /* expire_time is calculated from last frame_time, we should calculate it
+ * according to new frame_time which equals to
+ * NANOSECONDS_PER_SECOND / uhci_frame_timer_freq */
+ s->expire_time -= s->frame_time - NANOSECONDS_PER_SECOND / uhci_frame_timer_freq;
+ s->frame_time = NANOSECONDS_PER_SECOND / uhci_frame_timer_freq;
+ timer_mod(s->frame_timer, t_now + s->frame_time);
}
static const MemoryRegionOps uhci_ioport_ops = {
@@ -1196,8 +1239,10 @@ void usb_uhci_common_realize(PCIDevice *dev, Error **errp)
s->bh = qemu_bh_new(uhci_bh, s);
s->frame_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, uhci_frame_timer, s);
s->num_ports_vmstate = NB_PORTS;
+ s->frame_time = NANOSECONDS_PER_SECOND / uhci_frame_timer_freq;
QTAILQ_INIT(&s->queues);
+ qemu_register_usb_controller(&qemu_uhci, QEMU_USB_CONTROLLER_UHCI);
memory_region_init_io(&s->io_bar, OBJECT(s), &uhci_ioport_ops, s,
"uhci", 0x20);
diff --git a/hw/usb/hcd-uhci.h b/hw/usb/hcd-uhci.h
index c85ab7868e..5194d22ab4 100644
--- a/hw/usb/hcd-uhci.h
+++ b/hw/usb/hcd-uhci.h
@@ -50,6 +50,7 @@ typedef struct UHCIState {
uint16_t status;
uint16_t intr; /* interrupt enable register */
uint16_t frnum; /* frame number */
+ uint64_t frame_time; /* frame time in ns */
uint32_t fl_base_addr; /* frame list base address */
uint8_t sof_timing;
uint8_t status2; /* bit 0 and 1 are used to generate UHCI_STS_USBINT */
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index d0d46dd0a4..8f521ad586 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -945,6 +945,30 @@ static void usb_host_ep_update(USBHostDevice *s)
libusb_free_config_descriptor(conf);
}
+static unsigned int usb_get_controller_type(int speed)
+{
+ unsigned int type = MAX_USB_CONTROLLER_TYPES;
+
+ switch (speed) {
+ case USB_SPEED_SUPER:
+ type = QEMU_USB_CONTROLLER_XHCI;
+ break;
+ case USB_SPEED_HIGH:
+ type = QEMU_USB_CONTROLLER_EHCI;
+ break;
+ case USB_SPEED_FULL:
+ type = QEMU_USB_CONTROLLER_UHCI;
+ break;
+ case USB_SPEED_LOW:
+ type = QEMU_USB_CONTROLLER_OHCI;
+ break;
+ default:
+ break;
+ }
+
+ return type;
+}
+
static int usb_host_open(USBHostDevice *s, libusb_device *dev, int hostfd)
{
USBDevice *udev = USB_DEVICE(s);
@@ -1054,6 +1078,12 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev, int hostfd)
}
trace_usb_host_open_success(bus_num, addr);
+
+ /* change ehci frame time freq when USB passthrough */
+ qemu_log("usb host speed is %d\n", udev->speed);
+ qemu_timer_set_mode(QEMU_TIMER_USB_NORMAL_MODE,
+ usb_get_controller_type(udev->speed));
+
return 0;
fail:
@@ -1129,6 +1159,8 @@ static int usb_host_close(USBHostDevice *s)
}
usb_host_auto_check(NULL);
+ qemu_timer_set_mode(QEMU_TIMER_USB_LAZY_MODE,
+ usb_get_controller_type(udev->speed));
return 0;
}
diff --git a/include/hw/usb.h b/include/hw/usb.h
index 33668dd0a9..fa3a176159 100644
--- a/include/hw/usb.h
+++ b/include/hw/usb.h
@@ -142,6 +142,7 @@
#define USB_DEVICE_SELF_POWERED 0
#define USB_DEVICE_REMOTE_WAKEUP 1
+#define USB_DEVICE_REMOTE_WAKEUP_IS_SUPPORTED 2
#define USB_DT_DEVICE 0x01
#define USB_DT_CONFIG 0x02
diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index 88ef114689..d263fad9a4 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -91,6 +91,34 @@ struct QEMUTimer {
int scale;
};
+#define QEMU_USB_NORMAL_FREQ 1000
+#define QEMU_USB_LAZY_FREQ 10
+#define MAX_USB_CONTROLLER_TYPES 4
+#define QEMU_USB_CONTROLLER_OHCI 0
+#define QEMU_USB_CONTROLLER_UHCI 1
+#define QEMU_USB_CONTROLLER_EHCI 2
+#define QEMU_USB_CONTROLLER_XHCI 3
+
+typedef void (*QEMUSetFreqHandler) (int freq);
+
+typedef struct qemu_usb_controller {
+ const char *name;
+ QEMUSetFreqHandler qemu_set_freq;
+} qemu_usb_controller;
+
+typedef qemu_usb_controller* qemu_usb_controller_ptr;
+
+enum qemu_timer_mode {
+ QEMU_TIMER_USB_NORMAL_MODE = 1 << 0, /* Set when VNC connect or
+ * with usb dev passthrough
+ */
+ QEMU_TIMER_USB_LAZY_MODE = 1 << 1, /* Set when VNC disconnect */
+};
+
+int qemu_register_usb_controller(qemu_usb_controller_ptr controller,
+ unsigned int type);
+int qemu_timer_set_mode(enum qemu_timer_mode mode, unsigned int type);
+
extern QEMUTimerListGroup main_loop_tlg;
/*
diff --git a/ui/vnc.c b/ui/vnc.c
index af02522e84..bc86c20370 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -1379,6 +1379,8 @@ void vnc_disconnect_finish(VncState *vs)
g_free(vs->zrle);
g_free(vs->tight);
g_free(vs);
+
+ qemu_timer_set_mode(QEMU_TIMER_USB_LAZY_MODE, QEMU_USB_CONTROLLER_UHCI);
}
size_t vnc_client_io_error(VncState *vs, ssize_t ret, Error *err)
@@ -3333,6 +3335,8 @@ static void vnc_connect(VncDisplay *vd, QIOChannelSocket *sioc,
}
}
}
+
+ qemu_timer_set_mode(QEMU_TIMER_USB_NORMAL_MODE, QEMU_USB_CONTROLLER_UHCI);
}
void vnc_start_protocol(VncState *vs)
diff --git a/util/qemu-timer.c b/util/qemu-timer.c
index f36c75e594..40e8c83722 100644
--- a/util/qemu-timer.c
+++ b/util/qemu-timer.c
@@ -23,6 +23,7 @@
*/
#include "qemu/osdep.h"
+#include "qemu/log.h"
#include "qemu/main-loop.h"
#include "qemu/timer.h"
#include "qemu/lockable.h"
@@ -75,6 +76,74 @@ struct QEMUTimerList {
QemuEvent timers_done_ev;
};
+typedef struct qemu_controller_timer_state {
+ qemu_usb_controller_ptr controller;
+ int refs;
+} controller_timer_state;
+
+typedef controller_timer_state* controller_timer_state_ptr;
+
+static controller_timer_state uhci_timer_state = {
+ .controller = NULL,
+ .refs = 0,
+};
+
+static controller_timer_state_ptr \
+ qemu_usb_controller_tab[MAX_USB_CONTROLLER_TYPES] = {NULL,
+ &uhci_timer_state,
+ NULL, NULL};
+
+int qemu_register_usb_controller(qemu_usb_controller_ptr controller,
+ unsigned int type)
+{
+ if (type != QEMU_USB_CONTROLLER_UHCI) {
+ return 0;
+ }
+
+ /* for companion EHCI controller will create three UHCI controllers,
+ * we init it only once.
+ */
+ if (!qemu_usb_controller_tab[type]->controller) {
+ qemu_log("the usb controller (%d) registed frame handler\n", type);
+ qemu_usb_controller_tab[type]->controller = controller;
+ }
+
+ return 0;
+}
+
+int qemu_timer_set_mode(enum qemu_timer_mode mode, unsigned int type)
+{
+ if (type != QEMU_USB_CONTROLLER_UHCI) {
+ qemu_log("the usb controller (%d) no need change frame frep\n", type);
+ return 0;
+ }
+
+ if (!qemu_usb_controller_tab[type]->controller) {
+ qemu_log("the usb controller (%d) not registed yet\n", type);
+ return 0;
+ }
+
+ if (mode == QEMU_TIMER_USB_NORMAL_MODE) {
+ if (qemu_usb_controller_tab[type]->refs++ > 0) {
+ return 0;
+ }
+ qemu_usb_controller_tab[type]->controller->
+ qemu_set_freq(QEMU_USB_NORMAL_FREQ);
+ qemu_log("Set the controller (%d) of freq %d HZ,\n",
+ type, QEMU_USB_NORMAL_FREQ);
+ } else {
+ if (--qemu_usb_controller_tab[type]->refs > 0) {
+ return 0;
+ }
+ qemu_usb_controller_tab[type]->controller->
+ qemu_set_freq(QEMU_USB_LAZY_FREQ);
+ qemu_log("Set the controller(type:%d) of freq %d HZ,\n",
+ type, QEMU_USB_LAZY_FREQ);
+ }
+
+ return 0;
+}
+
/**
* qemu_clock_ptr:
* @type: type of clock
--
2.27.0
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