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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2010-10-28 15:40:26 -0700
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2011-03-13 18:23:06 -0700
commitc56354378426e550aaf6ddf3983f502a8fddeab5 (patch)
tree35464da7692b5ac096bc05841b2dc4761e711117 /drivers/usb
parent83de4b2b90887b5b317d8313864fe4cc5db35280 (diff)
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usb: Make core allocate resources per PCI-device.
Introduce the notion of a PCI device that may be associated with more than one USB host controller driver (struct usb_hcd). This patch is the start of the work to separate the xHCI host controller into two roothubs: a USB 3.0 roothub with SuperSpeed-only ports, and a USB 2.0 roothub with HS/FS/LS ports. One usb_hcd structure is designated to be the "primary HCD", and a pointer is added to the usb_hcd structure to keep track of that. A new function call, usb_hcd_is_primary_hcd() is added to check whether the USB hcd is marked as the primary HCD (or if it is not part of a roothub pair). To allow the USB core and xHCI driver to access either roothub in a pair, a "shared_hcd" pointer is added to the usb_hcd structure. Add a new function, usb_create_shared_hcd(), that does roothub allocation for paired roothubs. It will act just like usb_create_hcd() did if the primary_hcd pointer argument is NULL. If it is passed a non-NULL primary_hcd pointer, it sets usb_hcd->shared_hcd and usb_hcd->primary_hcd fields. It will also skip the bandwidth_mutex allocation, and set the secondary hcd's bandwidth_mutex pointer to the primary HCD's mutex. IRQs are only allocated once for the primary roothub. Introduce a new usb_hcd driver flag that indicates the host controller driver wants to create two roothubs. If the HCD_SHARED flag is set, then the USB core PCI probe methods will allocate a second roothub, and make sure that second roothub gets freed during rmmod and in initialization error paths. When usb_hc_died() is called with the primary HCD, make sure that any roothubs that share that host controller are also marked as being dead. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/hcd.c108
1 files changed, 89 insertions, 19 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index a0adcac..ba15eea 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2143,7 +2143,9 @@ EXPORT_SYMBOL_GPL(usb_hcd_irq);
*
* This is called by bus glue to report a USB host controller that died
* while operations may still have been pending. It's called automatically
- * by the PCI glue, so only glue for non-PCI busses should need to call it.
+ * by the PCI glue, so only glue for non-PCI busses should need to call it.
+ *
+ * Only call this function with the primary HCD.
*/
void usb_hc_died (struct usb_hcd *hcd)
{
@@ -2162,17 +2164,31 @@ void usb_hc_died (struct usb_hcd *hcd)
USB_STATE_NOTATTACHED);
usb_kick_khubd (hcd->self.root_hub);
}
+ if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
+ hcd = hcd->shared_hcd;
+ if (hcd->rh_registered) {
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+
+ /* make khubd clean up old urbs and devices */
+ usb_set_device_state(hcd->self.root_hub,
+ USB_STATE_NOTATTACHED);
+ usb_kick_khubd(hcd->self.root_hub);
+ }
+ }
spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
+ /* Make sure that the other roothub is also deallocated. */
}
EXPORT_SYMBOL_GPL (usb_hc_died);
/*-------------------------------------------------------------------------*/
/**
- * usb_create_hcd - create and initialize an HCD structure
+ * usb_create_shared_hcd - create and initialize an HCD structure
* @driver: HC driver that will use this hcd
* @dev: device for this HC, stored in hcd->self.controller
* @bus_name: value to store in hcd->self.bus_name
+ * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
+ * PCI device. Only allocate certain resources for the primary HCD
* Context: !in_interrupt()
*
* Allocate a struct usb_hcd, with extra space at the end for the
@@ -2181,8 +2197,9 @@ EXPORT_SYMBOL_GPL (usb_hc_died);
*
* If memory is unavailable, returns NULL.
*/
-struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
- struct device *dev, const char *bus_name)
+struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
+ struct device *dev, const char *bus_name,
+ struct usb_hcd *primary_hcd)
{
struct usb_hcd *hcd;
@@ -2191,16 +2208,24 @@ struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
dev_dbg (dev, "hcd alloc failed\n");
return NULL;
}
- hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
- GFP_KERNEL);
- if (!hcd->bandwidth_mutex) {
- kfree(hcd);
- dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
- return NULL;
+ if (primary_hcd == NULL) {
+ hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
+ GFP_KERNEL);
+ if (!hcd->bandwidth_mutex) {
+ kfree(hcd);
+ dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
+ return NULL;
+ }
+ mutex_init(hcd->bandwidth_mutex);
+ dev_set_drvdata(dev, hcd);
+ } else {
+ hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
+ hcd->primary_hcd = primary_hcd;
+ primary_hcd->primary_hcd = primary_hcd;
+ hcd->shared_hcd = primary_hcd;
+ primary_hcd->shared_hcd = hcd;
}
- mutex_init(hcd->bandwidth_mutex);
- dev_set_drvdata(dev, hcd);
kref_init(&hcd->kref);
usb_bus_init(&hcd->self);
@@ -2221,13 +2246,46 @@ struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
"USB Host Controller";
return hcd;
}
+EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
+
+/**
+ * usb_create_hcd - create and initialize an HCD structure
+ * @driver: HC driver that will use this hcd
+ * @dev: device for this HC, stored in hcd->self.controller
+ * @bus_name: value to store in hcd->self.bus_name
+ * Context: !in_interrupt()
+ *
+ * Allocate a struct usb_hcd, with extra space at the end for the
+ * HC driver's private data. Initialize the generic members of the
+ * hcd structure.
+ *
+ * If memory is unavailable, returns NULL.
+ */
+struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
+ struct device *dev, const char *bus_name)
+{
+ return usb_create_shared_hcd(driver, dev, bus_name, NULL);
+}
EXPORT_SYMBOL_GPL(usb_create_hcd);
+/*
+ * Roothubs that share one PCI device must also share the bandwidth mutex.
+ * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
+ * deallocated.
+ *
+ * Make sure to only deallocate the bandwidth_mutex when the primary HCD is
+ * freed. When hcd_release() is called for the non-primary HCD, set the
+ * primary_hcd's shared_hcd pointer to null (since the non-primary HCD will be
+ * freed shortly).
+ */
static void hcd_release (struct kref *kref)
{
struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
- kfree(hcd->bandwidth_mutex);
+ if (usb_hcd_is_primary_hcd(hcd))
+ kfree(hcd->bandwidth_mutex);
+ else
+ hcd->shared_hcd->shared_hcd = NULL;
kfree(hcd);
}
@@ -2246,6 +2304,14 @@ void usb_put_hcd (struct usb_hcd *hcd)
}
EXPORT_SYMBOL_GPL(usb_put_hcd);
+int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
+{
+ if (!hcd->primary_hcd)
+ return 1;
+ return hcd == hcd->primary_hcd;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
+
static int usb_hcd_request_irqs(struct usb_hcd *hcd,
unsigned int irqnum, unsigned long irqflags)
{
@@ -2367,9 +2433,11 @@ int usb_add_hcd(struct usb_hcd *hcd,
dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
/* enable irqs just before we start the controller */
- retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
- if (retval)
- goto err_request_irq;
+ if (usb_hcd_is_primary_hcd(hcd)) {
+ retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
+ if (retval)
+ goto err_request_irq;
+ }
hcd->state = HC_STATE_RUNNING;
retval = hcd->driver->start(hcd);
@@ -2416,7 +2484,7 @@ err_register_root_hub:
clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
del_timer_sync(&hcd->rh_timer);
err_hcd_driver_start:
- if (hcd->irq >= 0)
+ if (usb_hcd_is_primary_hcd(hcd) && hcd->irq >= 0)
free_irq(irqnum, hcd);
err_request_irq:
err_hcd_driver_setup:
@@ -2480,8 +2548,10 @@ void usb_remove_hcd(struct usb_hcd *hcd)
clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
del_timer_sync(&hcd->rh_timer);
- if (hcd->irq >= 0)
- free_irq(hcd->irq, hcd);
+ if (usb_hcd_is_primary_hcd(hcd)) {
+ if (hcd->irq >= 0)
+ free_irq(hcd->irq, hcd);
+ }
usb_put_dev(hcd->self.root_hub);
usb_deregister_bus(&hcd->self);