• Sarah Sharp's avatar
    USB: xhci: Correct assumptions about number of rings per endpoint. · e9df17eb
    Sarah Sharp authored
    Much of the xHCI driver code assumes that endpoints only have one ring.
    Now an endpoint can have one ring per enabled stream ID, so correct that
    assumption.  Use functions that translate the stream_id field in the URB
    or the DMA address of a TRB into the correct stream ring.
    
    Correct the polling loop to print out all enabled stream rings.  Make the
    URB cancellation routine find the correct stream ring if the URB has
    stream_id set.  Make sure the URB enqueueing routine does the same.  Also
    correct the code that handles stalled/halted endpoints.
    
    Check that commands and registers that can take stream IDs handle them
    properly.  That includes ringing an endpoint doorbell, resetting a
    stalled/halted endpoint, and setting a transfer ring dequeue pointer
    (since that command can set the dequeue pointer in a stream context or an
    endpoint context).
    
    Correct the transfer event handler to translate a TRB DMA address into the
    stream ring it was enqueued to.  Make the code to allocate and prepare TD
    structures adds the TD to the right td_list for the stream ring.  Make
    sure the code to give the first TRB in a TD to the hardware manipulates
    the correct stream ring.
    
    When an endpoint stalls, store the stream ID of the stream ring that
    stalled in the xhci_virt_ep structure.  Use that instead of the stream ID
    in the URB, since an URB may be re-used after it is given back after a
    non-control endpoint stall.
    Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    e9df17eb
xhci.h 49.2 KB