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xhci: drop buffering

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This patch splits the xhci_xfer_data function into three.
The xhci_xfer_data function used to do does two things:

  (1) copy transfer data between guest memory and a temporary buffer.
  (2) report transfer results to the guest using events.

Now we three functions to handle this:

  (1) xhci_xfer_map creates a scatter list for the transfer and
      uses that (instead of the temporary buffer) to build a
      USBPacket.
  (2) xhci_xfer_unmap undoes the mapping.
  (3) xhci_xfer_report sends out events.

The patch also fixes reporting of transaction errors which must be
reported unconditinally, not only in case the guest asks for it
using the ISP flag.

[ v2: fix warning ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-08-17 11:04:36 +02:00
parent 331e9406f1
commit d5a15814b4
2 changed files with 72 additions and 115 deletions
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2
trace-events
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@ -326,7 +326,7 @@ usb_xhci_ep_disable(uint32_t slotid, uint32_t epid) "slotid %d, epid %d"
usb_xhci_ep_kick(uint32_t slotid, uint32_t epid) "slotid %d, epid %d"
usb_xhci_ep_stop(uint32_t slotid, uint32_t epid) "slotid %d, epid %d"
usb_xhci_ep_reset(uint32_t slotid, uint32_t epid) "slotid %d, epid %d"
usb_xhci_xfer_start(void *xfer, uint32_t slotid, uint32_t epid, uint32_t length) "%p: slotid %d, epid %d, length %d"
usb_xhci_xfer_start(void *xfer, uint32_t slotid, uint32_t epid) "%p: slotid %d, epid %d"
usb_xhci_xfer_async(void *xfer) "%p"
usb_xhci_xfer_nak(void *xfer) "%p"
usb_xhci_xfer_retry(void *xfer) "%p"