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[Qemu-devel] [patch 2/2] support for UHCI suspend / remote wake up
From: |
Marcelo Tosatti |
Subject: |
[Qemu-devel] [patch 2/2] support for UHCI suspend / remote wake up |
Date: |
Thu, 25 Nov 2010 15:04:41 -0200 |
User-agent: |
quilt/0.47-1 |
This patch enables USB UHCI global suspend/resume feature. The OS will
stop the HC once all ports are suspended. If there is activity on the
port(s), an interrupt signalling remote wakeup will be triggered.
To enable autosuspend for the USB tablet on Linux guests:
echo auto > /sys/devices/pci0000:00/0000:00:01.2/usb1/1-1/power/level
It reduces CPU consumption of an idle FC12 guest from 2.7% to 0.3%.
Signed-off-by: Marcelo Tosatti <address@hidden>
Index: qemu-kvm/hw/usb-hid.c
===================================================================
--- qemu-kvm.orig/hw/usb-hid.c
+++ qemu-kvm/hw/usb-hid.c
@@ -412,6 +412,9 @@ static void usb_hid_changed(USBHIDState
if (hs->datain)
hs->datain(hs->datain_opaque);
+
+ if (hs->dev.remote_wakeup)
+ usb_remote_wakeup(&hs->dev);
}
static void usb_mouse_event(void *opaque,
Index: qemu-kvm/hw/usb-uhci.c
===================================================================
--- qemu-kvm.orig/hw/usb-uhci.c
+++ qemu-kvm/hw/usb-uhci.c
@@ -59,6 +59,7 @@
#define UHCI_PORT_RESET (1 << 9)
#define UHCI_PORT_LSDA (1 << 8)
+#define UHCI_PORT_RD (1 << 6)
#define UHCI_PORT_ENC (1 << 3)
#define UHCI_PORT_EN (1 << 2)
#define UHCI_PORT_CSC (1 << 1)
@@ -501,6 +502,7 @@ static void uhci_ioport_writew(void *opa
port->ctrl = (port->ctrl & 0x01fb) | (val & ~0x01fb);
/* some bits are reset when a '1' is written to them */
port->ctrl &= ~(val & 0x000a);
+ port->ctrl &= ~(port->ctrl & 0x0040); /* clear port resume
detected */
}
break;
}
@@ -593,6 +595,41 @@ static void uhci_resume (void *opaque)
}
}
+static UHCIPort *find_port(UHCIState *s, USBDevice *d)
+{
+ int i;
+
+ for (i = 0; i < NB_PORTS; i++) {
+ UHCIPort *port = &s->ports[i];
+
+ if (d == port->port.dev) {
+ return port;
+ }
+ }
+
+ return NULL;
+}
+
+static void uhci_event(USBBus *bus, USBDevice *dev)
+{
+ UHCIState *s = container_of(bus, UHCIState, bus);
+
+ if (s->cmd & UHCI_CMD_EGSM) {
+ UHCIPort *port = find_port(s, dev);
+
+ if (!port) {
+ return;
+ }
+
+ if (port->ctrl & UHCI_PORT_RD) {
+ return;
+ }
+
+ port->ctrl |= UHCI_PORT_RD;
+ uhci_resume(s);
+ }
+}
+
static void uhci_attach(USBPort *port1, USBDevice *dev)
{
UHCIState *s = port1->opaque;
@@ -1101,6 +1138,10 @@ static void uhci_map(PCIDevice *pci_dev,
register_ioport_read(addr, 32, 1, uhci_ioport_readb, s);
}
+static USBBusOps uhci_bus_ops = {
+ .remote_wakeup_cb = uhci_event,
+};
+
static int usb_uhci_common_initfn(UHCIState *s)
{
uint8_t *pci_conf = s->dev.config;
@@ -1113,7 +1154,7 @@ static int usb_uhci_common_initfn(UHCISt
pci_conf[PCI_INTERRUPT_PIN] = 4; // interrupt pin 3
pci_conf[0x60] = 0x10; // release number
- usb_bus_new(&s->bus, &s->dev.qdev, NULL);
+ usb_bus_new(&s->bus, &s->dev.qdev, &uhci_bus_ops);
for(i = 0; i < NB_PORTS; i++) {
usb_register_port(&s->bus, &s->ports[i].port, s, i, uhci_attach);
}
- [Qemu-devel] PATCH: QEMU support for UHCI suspend / remote wake up, Marcelo Tosatti, 2010/11/25
- [Qemu-devel] Re: PATCH: QEMU support for UHCI suspend / remote wake up, Gerd Hoffmann, 2010/11/25
- [Qemu-devel] [patch 0/2] USB UHCI global suspend / remote wakeup, Marcelo Tosatti, 2010/11/25
- [Qemu-devel] [patch 2/2] support for UHCI suspend / remote wake up,
Marcelo Tosatti <=
- [Qemu-devel] [patch 1/2] add USBBusOps to USBBus, Marcelo Tosatti, 2010/11/25
- Re: [Qemu-devel] [patch 0/2] USB UHCI global suspend / remote wakeup, Paul Brook, 2010/11/25
- Re: [Qemu-devel] [patch 0/2] USB UHCI global suspend / remote wakeup, Marcelo Tosatti, 2010/11/25
- Re: [Qemu-devel] [patch 0/2] USB UHCI global suspend / remote wakeup, Gerd Hoffmann, 2010/11/26
- Re: [Qemu-devel] [patch 0/2] USB UHCI global suspend / remote wakeup, Paul Brook, 2010/11/26