USB: Parse and store the SuperSpeed endpoint companion descriptors.

The USB 3.0 bus specification added an "Endpoint Companion" descriptor that is
supposed to follow all SuperSpeed Endpoint descriptors.  This descriptor is used
to extend the bus protocol to allow more packets to be sent to an endpoint per
"microframe".  The word microframe was removed from the USB 3.0 specification
because the host controller does not send Start Of Frame (SOF) symbols down the
USB 3.0 wires.

The descriptor defines a bMaxBurst field, which indicates the number of packets
of wMaxPacketSize that a SuperSpeed device can send or recieve in a service
interval.  All non-control endpoints may set this value as high as 16 packets
(bMaxBurst = 15).

The descriptor also allows isochronous endpoints to further specify that they
can send and receive multiple bursts per service interval.  The bmAttributes
allows them to specify a "Mult" of up to 3 (bmAttributes = 2).

Bulk endpoints use bmAttributes to report the number of "Streams" they support.
This was an extension of the endpoint pipe concept to allow multiple mass
storage device commands to be outstanding for one bulk endpoint at a time.  This
should allow USB 3.0 mass storage devices to support SCSI command queueing.
Bulk endpoints can say they support up to 2^16 (65,536) streams.

The information in the endpoint companion descriptor must be stored with the
other device, config, interface, and endpoint descriptors because the host
controller needs to access them quickly, and we need to install some default
values if a SuperSpeed device doesn't provide an endpoint companion descriptor.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 112a2d6e922f..13bced521b83 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -36,6 +36,7 @@ struct wusb_dev;
  *  - configs have one (often) or more interfaces;
  *  - interfaces have one (usually) or more settings;
  *  - each interface setting has zero or (usually) more endpoints.
+ *  - a SuperSpeed endpoint has a companion descriptor
  *
  * And there might be other descriptors mixed in with those.
  *
@@ -44,6 +45,19 @@ struct wusb_dev;
 
 struct ep_device;
 
+/* For SS devices */
+/**
+ * struct usb_host_ep_comp - Valid for SuperSpeed devices only
+ * @desc: endpoint companion descriptor, wMaxPacketSize in native byteorder
+ * @extra: descriptors following this endpoint companion descriptor
+ * @extralen: how many bytes of "extra" are valid
+ */
+struct usb_host_ep_comp {
+        struct usb_ep_comp_descriptor   desc;
+        unsigned char                   *extra;   /* Extra descriptors */
+        int                             extralen;
+};
+
 /**
  * struct usb_host_endpoint - host-side endpoint descriptor and queue
  * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
@@ -51,6 +65,7 @@ struct ep_device;
  * @hcpriv: for use by HCD; typically holds hardware dma queue head (QH)
  *      with one or more transfer descriptors (TDs) per urb
  * @ep_dev: ep_device for sysfs info
+ * @ep_comp: companion descriptor information for this endpoint
  * @extra: descriptors following this endpoint in the configuration
  * @extralen: how many bytes of "extra" are valid
  * @enabled: URBs may be submitted to this endpoint
@@ -63,6 +78,7 @@ struct usb_host_endpoint {
         struct list_head                urb_list;
         void                            *hcpriv;
         struct ep_device                *ep_dev;        /* For sysfs info */
+        struct usb_host_ep_comp         *ep_comp;       /* For SS devices */
 
         unsigned char *extra;   /* Extra descriptors */
         int extralen;