Hi,
Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx> writes:
> diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
> index 40fa25c4d041..a4efbe62a1a3 100644
> --- a/drivers/usb/host/xhci-ring.c
> +++ b/drivers/usb/host/xhci-ring.c
> @@ -3272,8 +3272,15 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> field |= TRB_IOC;
> more_trbs_coming = false;
> td->last_trb = ring->enqueue;
> +
> + if (xhci_urb_suitable_for_idt(urb)) {
> + memcpy(&send_addr, urb->transfer_buffer,
> + trb_buff_len);
> + field |= TRB_IDT;
> + }
> }
>
> +
trailing change
> @@ -3411,6 +3418,12 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> if (urb->transfer_buffer_length > 0) {
> u32 length_field, remainder;
>
> + if (xhci_urb_suitable_for_idt(urb)) {
> + memcpy(&urb->transfer_dma, urb->transfer_buffer,
> + urb->transfer_buffer_length);
> + field |= TRB_IDT;
> + }
> +
> remainder = xhci_td_remainder(xhci, 0,
> urb->transfer_buffer_length,
> urb->transfer_buffer_length,
> @@ -3420,6 +3433,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> TRB_INTR_TARGET(0);
> if (setup->bRequestType & USB_DIR_IN)
> field |= TRB_DIR_IN;
> +
trailing change
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 005e65922608..dec62f7f5dc8 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -1238,6 +1238,21 @@ EXPORT_SYMBOL_GPL(xhci_resume);
>
> /*-------------------------------------------------------------------------*/
>
> +/*
> + * Bypass the DMA mapping if URB is suitable for Immediate Transfer (IDT),
> + * we'll copy the actual data into the TRB address register. This is limited to
> + * transfers up to 8 bytes on output endpoints of any kind with wMaxPacketSize
> + * >= 8 bytes.
> + */
> +static int xhci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
> + gfp_t mem_flags)
> +{
> + if (xhci_urb_suitable_for_idt(urb))
> + return 0;
> +
> + return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
> +}
don't you need a matching unmap_urb_for_dma()??
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index 652dc36e3012..9d77b0901ab7 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1295,6 +1295,8 @@ enum xhci_setup_dev {
> #define TRB_IOC (1<<5)
> /* The buffer pointer contains immediate data */
> #define TRB_IDT (1<<6)
> +/* TDs smaller than this might use IDT */
Technically, "TDs at most this" since you're 8 itself is an allowed
size.
--
balbi
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