On Wed, 7 Apr 2010, Sarah Sharp wrote:
> > > I really struggled with the descriptor parsing code to get it right, so
> > > I really don't ever want to touch that code again. Maybe someone else
> > > wants to take a shot at it?
> >
> > I can change it to do this. Parts of xhci-hcd would have to be changed
> > too.
>
> Ok, sure, just CC me on the patches and I'll see if I need to rebase the
> streams patches.
Does this look okay to you? I don't have any way to test it.
Alan Stern
Index: usb-2.6/include/linux/usb.h
===================================================================
--- usb-2.6.orig/include/linux/usb.h
+++ usb-2.6/include/linux/usb.h
@@ -45,19 +45,6 @@ struct wusb_dev;
struct ep_device;
-/* For SS devices */
-/**
- * struct usb_host_ss_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_ss_ep_comp {
- struct usb_ss_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
@@ -65,7 +52,7 @@ struct usb_host_ss_ep_comp {
* @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
- * @ss_ep_comp: companion descriptor information for this endpoint
+ * @ss_ep_comp: SuperSpeed companion descriptor 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
@@ -78,7 +65,7 @@ struct usb_host_endpoint {
struct list_head urb_list;
void *hcpriv;
struct ep_device *ep_dev; /* For sysfs info */
- struct usb_host_ss_ep_comp *ss_ep_comp; /* For SS devices */
+ struct usb_ss_ep_comp_descriptor ss_ep_comp;
unsigned char *extra; /* Extra descriptors */
int extralen;
Index: usb-2.6/drivers/usb/host/xhci-mem.c
===================================================================
--- usb-2.6.orig/drivers/usb/host/xhci-mem.c
+++ usb-2.6/drivers/usb/host/xhci-mem.c
@@ -657,12 +657,9 @@ int xhci_endpoint_init(struct xhci_hcd *
max_packet = ep->desc.wMaxPacketSize;
ep_ctx->ep_info2 |= MAX_PACKET(max_packet);
/* dig out max burst from ep companion desc */
- if (!ep->ss_ep_comp) {
- xhci_warn(xhci, "WARN no SS endpoint companion descriptor.\n");
- max_packet = 0;
- } else {
- max_packet = ep->ss_ep_comp->desc.bMaxBurst;
- }
+ max_packet = ep->ss_ep_comp.bMaxBurst;
+ if (!max_packet)
+ xhci_warn(xhci, "WARN no SS endpoint bMaxBurst\n");
ep_ctx->ep_info2 |= MAX_BURST(max_packet);
break;
case USB_SPEED_HIGH:
Index: usb-2.6/drivers/usb/core/config.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/config.c
+++ usb-2.6/drivers/usb/core/config.c
@@ -19,32 +19,6 @@ static inline const char *plural(int n)
return (n == 1 ? "" : "s");
}
-/* FIXME: this is a kludge */
-static int find_next_descriptor_more(unsigned char *buffer, int size,
- int dt1, int dt2, int dt3, int *num_skipped)
-{
- struct usb_descriptor_header *h;
- int n = 0;
- unsigned char *buffer0 = buffer;
-
- /* Find the next descriptor of type dt1 or dt2 or dt3 */
- while (size > 0) {
- h = (struct usb_descriptor_header *) buffer;
- if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2 ||
- h->bDescriptorType == dt3)
- break;
- buffer += h->bLength;
- size -= h->bLength;
- ++n;
- }
-
- /* Store the number of descriptors skipped and return the
- * number of bytes skipped */
- if (num_skipped)
- *num_skipped = n;
- return buffer - buffer0;
-}
-
static int find_next_descriptor(unsigned char *buffer, int size,
int dt1, int dt2, int *num_skipped)
{
@@ -69,47 +43,41 @@ static int find_next_descriptor(unsigned
return buffer - buffer0;
}
-static int usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
+static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
int inum, int asnum, struct usb_host_endpoint *ep,
- int num_ep, unsigned char *buffer, int size)
+ unsigned char *buffer, int size)
{
- unsigned char *buffer_start = buffer;
- struct usb_ss_ep_comp_descriptor *desc;
- int retval;
- int num_skipped;
+ struct usb_ss_ep_comp_descriptor *desc;
int max_tx;
- int i;
+ /* The SuperSpeed endpoint companion descriptor is supposed to
+ * be the first thing immediately following the endpoint descriptor.
+ */
desc = (struct usb_ss_ep_comp_descriptor *) buffer;
- if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP) {
+ if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP ||
+ size < USB_DT_SS_EP_COMP_SIZE) {
dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
" interface %d altsetting %d ep %d: "
"using minimum values\n",
cfgno, inum, asnum, ep->desc.bEndpointAddress);
- /*
- * The next descriptor is for an Endpoint or Interface,
- * no extra descriptors to copy into the companion structure,
- * and we didn't eat up any of the buffer.
+
+ /* Fill in some default values.
+ * Leave bmAttributes as zero, which will mean no streams for
+ * bulk, and isoc won't support multiple bursts of packets.
+ * With bursts of only one packet, and a Mult of 1, the max
+ * amount of data moved per endpoint service interval is one
+ * packet.
*/
- return 0;
+ ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE;
+ ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
+ if (usb_endpoint_xfer_isoc(&ep->desc) ||
+ usb_endpoint_xfer_int(&ep->desc))
+ ep->ss_ep_comp.wBytesPerInterval =
+ ep->desc.wMaxPacketSize;
+ return;
}
- memcpy(&ep->ss_ep_comp->desc, desc, USB_DT_SS_EP_COMP_SIZE);
- desc = &ep->ss_ep_comp->desc;
- buffer += desc->bLength;
- size -= desc->bLength;
- /* Eat up the other descriptors we don't care about */
- ep->ss_ep_comp->extra = buffer;
- i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
- USB_DT_INTERFACE, &num_skipped);
- ep->ss_ep_comp->extralen = i;
- buffer += i;
- size -= i;
- retval = buffer - buffer_start;
- if (num_skipped > 0)
- dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
- num_skipped, plural(num_skipped),
- "SuperSpeed endpoint companion");
+ memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
/* Check the various values */
if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
@@ -117,15 +85,16 @@ static int usb_parse_ss_endpoint_compani
"config %d interface %d altsetting %d ep %d: "
"setting to zero\n", desc->bMaxBurst,
cfgno, inum, asnum, ep->desc.bEndpointAddress);
- desc->bMaxBurst = 0;
+ ep->ss_ep_comp.bMaxBurst = 0;
}
- if (desc->bMaxBurst > 15) {
+ else if (desc->bMaxBurst > 15) {
dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
"config %d interface %d altsetting %d ep %d: "
"setting to 15\n", desc->bMaxBurst,
cfgno, inum, asnum, ep->desc.bEndpointAddress);
- desc->bMaxBurst = 15;
+ ep->ss_ep_comp.bMaxBurst = 15;
}
+
if ((usb_endpoint_xfer_control(&ep->desc) || usb_endpoint_xfer_int(&ep->desc))
&& desc->bmAttributes != 0) {
dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
@@ -134,30 +103,30 @@ static int usb_parse_ss_endpoint_compani
usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
desc->bmAttributes,
cfgno, inum, asnum, ep->desc.bEndpointAddress);
- desc->bmAttributes = 0;
+ ep->ss_ep_comp.bmAttributes = 0;
}
- if (usb_endpoint_xfer_bulk(&ep->desc) && desc->bmAttributes > 16) {
+ else if (usb_endpoint_xfer_bulk(&ep->desc) && desc->bmAttributes > 16) {
dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
"config %d interface %d altsetting %d ep %d: "
"setting to max\n",
cfgno, inum, asnum, ep->desc.bEndpointAddress);
- desc->bmAttributes = 16;
+ ep->ss_ep_comp.bmAttributes = 16;
}
- if (usb_endpoint_xfer_isoc(&ep->desc) && desc->bmAttributes > 2) {
+ else if (usb_endpoint_xfer_isoc(&ep->desc) && desc->bmAttributes > 2) {
dev_warn(ddev, "Isoc endpoint has Mult of %d in "
"config %d interface %d altsetting %d ep %d: "
"setting to 3\n", desc->bmAttributes + 1,
cfgno, inum, asnum, ep->desc.bEndpointAddress);
- desc->bmAttributes = 2;
+ ep->ss_ep_comp.bmAttributes = 2;
}
- if (usb_endpoint_xfer_isoc(&ep->desc)) {
+
+ if (usb_endpoint_xfer_isoc(&ep->desc))
max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1) *
(desc->bmAttributes + 1);
- } else if (usb_endpoint_xfer_int(&ep->desc)) {
+ else if (usb_endpoint_xfer_int(&ep->desc))
max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1);
- } else {
- goto valid;
- }
+ else
+ max_tx = 999999;
if (desc->wBytesPerInterval > max_tx) {
dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
"config %d interface %d altsetting %d ep %d: "
@@ -166,10 +135,8 @@ static int usb_parse_ss_endpoint_compani
desc->wBytesPerInterval,
cfgno, inum, asnum, ep->desc.bEndpointAddress,
max_tx);
- desc->wBytesPerInterval = max_tx;
+ ep->ss_ep_comp.wBytesPerInterval = max_tx;
}
-valid:
- return retval;
}
static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
@@ -291,61 +258,19 @@ static int usb_parse_endpoint(struct dev
cfgno, inum, asnum, d->bEndpointAddress,
maxp);
}
- /* Allocate room for and parse any SS endpoint companion descriptors */
- if (to_usb_device(ddev)->speed == USB_SPEED_SUPER) {
- endpoint->extra = buffer;
- i = find_next_descriptor_more(buffer, size, USB_DT_SS_ENDPOINT_COMP,
- USB_DT_ENDPOINT, USB_DT_INTERFACE, &n);
- endpoint->extralen = i;
- buffer += i;
- size -= i;
-
- /* Allocate space for the SS endpoint companion descriptor */
- endpoint->ss_ep_comp = kzalloc(sizeof(struct usb_host_ss_ep_comp),
- GFP_KERNEL);
- if (!endpoint->ss_ep_comp)
- return -ENOMEM;
- /* Fill in some default values (may be overwritten later) */
- endpoint->ss_ep_comp->desc.bLength = USB_DT_SS_EP_COMP_SIZE;
- endpoint->ss_ep_comp->desc.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
- endpoint->ss_ep_comp->desc.bMaxBurst = 0;
- /*
- * Leave bmAttributes as zero, which will mean no streams for
- * bulk, and isoc won't support multiple bursts of packets.
- * With bursts of only one packet, and a Mult of 1, the max
- * amount of data moved per endpoint service interval is one
- * packet.
- */
- if (usb_endpoint_xfer_isoc(&endpoint->desc) ||
- usb_endpoint_xfer_int(&endpoint->desc))
- endpoint->ss_ep_comp->desc.wBytesPerInterval =
- endpoint->desc.wMaxPacketSize;
-
- if (size > 0) {
- retval = usb_parse_ss_endpoint_companion(ddev, cfgno,
- inum, asnum, endpoint, num_ep, buffer,
- size);
- if (retval >= 0) {
- buffer += retval;
- retval = buffer - buffer0;
- }
- } else {
- dev_warn(ddev, "config %d interface %d altsetting %d "
- "endpoint 0x%X has no "
- "SuperSpeed companion descriptor\n",
- cfgno, inum, asnum, d->bEndpointAddress);
- retval = buffer - buffer0;
- }
- } else {
- /* Skip over any Class Specific or Vendor Specific descriptors;
- * find the next endpoint or interface descriptor */
- endpoint->extra = buffer;
- i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
- USB_DT_INTERFACE, &n);
- endpoint->extralen = i;
- retval = buffer - buffer0 + i;
- }
+ /* Parse a possible SuperSpeed endpoint companion descriptor */
+ if (to_usb_device(ddev)->speed == USB_SPEED_SUPER)
+ usb_parse_ss_endpoint_companion(ddev, cfgno,
+ inum, asnum, endpoint, buffer, size);
+
+ /* Skip over any Class Specific or Vendor Specific descriptors;
+ * find the next endpoint or interface descriptor */
+ endpoint->extra = buffer;
+ i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
+ USB_DT_INTERFACE, &n);
+ endpoint->extralen = i;
+ retval = buffer - buffer0 + i;
if (n > 0)
dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
n, plural(n), "endpoint");
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
