From 8e51adccd4c4b9ffcd509d7f2afce0a906139f75 Mon Sep 17 00:00:00 2001 From: Andiry Xu Date: Thu, 22 Jul 2010 15:23:31 -0700 Subject: USB: xHCI: Introduce urb_priv structure Add urb_priv data structure to xHCI driver. This structure allows multiple xhci TDs to be linked to one urb, which is essential for isochronous transfer. For non-isochronous urb, only one TD is needed for one urb; for isochronous urb, the TD number for the urb is equal to urb->number_of_packets. The length field of urb_priv indicates the number of TDs in the urb. The td_cnt field indicates the number of TDs already processed by xHC. When td_cnt matches length, the urb can be given back to usbcore. When an urb is dequeued or cancelled, add all the unprocessed TDs to the endpoint's cancelled_td_list. When process a cancelled TD, increase td_cnt field. When td_cnt equals urb_priv->length, giveback the cancelled urb. Signed-off-by: Andiry Xu Signed-off-by: Sarah Sharp Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/usb/host/xhci.h') diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index f4dfb26a65aa..ebf62082950b 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1090,6 +1090,12 @@ struct xhci_scratchpad { dma_addr_t *sp_dma_buffers; }; +struct urb_priv { + int length; + int td_cnt; + struct xhci_td *td[0]; +}; + /* * Each segment table entry is 4*32bits long. 1K seems like an ok size: * (1K bytes * 8bytes/bit) / (4*32 bits) = 64 segment entries in the table, @@ -1347,6 +1353,7 @@ struct xhci_ring *xhci_stream_id_to_ring( struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci, bool allocate_in_ctx, bool allocate_completion, gfp_t mem_flags); +void xhci_urb_free_priv(struct xhci_hcd *xhci, struct urb_priv *urb_priv); void xhci_free_command(struct xhci_hcd *xhci, struct xhci_command *command); -- cgit v1.2.3