linux-kernel - Re: [RFC PATCH 07/14] usb: host: xhci: Add XHCI secondary interrupter support

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Date:   Sat, 24 Dec 2022 09:55:17 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wesley Cheng <quic_wcheng@...cinc.com>
Cc:     srinivas.kandagatla@...aro.org, mathias.nyman@...el.com,
        perex@...ex.cz, broonie@...nel.org, lgirdwood@...il.com,
        andersson@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        Thinh.Nguyen@...opsys.com, bgoswami@...cinc.com, tiwai@...e.com,
        robh+dt@...nel.org, agross@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, quic_jackp@...cinc.com,
        quic_plai@...cinc.com
Subject: Re: [RFC PATCH 07/14] usb: host: xhci: Add XHCI secondary
 interrupter support

On Fri, Dec 23, 2022 at 03:31:53PM -0800, Wesley Cheng wrote:
> Implement the XHCI operations for allocating and requesting for a secondary
> interrupter.  The secondary interrupter can allow for events for a
> particular endpoint to be routed to a separate event ring.  The event
> routing is defined when submitting a transfer descriptor to the USB HW.
> There is a specific field which denotes which interrupter ring to route the
> event to when the transfer is completed.
> 
> An example use case, such as audio packet offloading can utilize a separate
> event ring, so that these events can be routed to a different processor
> within the system.  The processor would be able to independently submit
> transfers and handle its completions without intervention from the main
> processor.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> ---
>  drivers/usb/host/xhci-mem.c  | 219 ++++++++++++++++++++++++++++-------
>  drivers/usb/host/xhci-plat.c |   2 +
>  drivers/usb/host/xhci.c      | 169 ++++++++++++++++++++++++++-
>  drivers/usb/host/xhci.h      |  15 +++
>  4 files changed, 363 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
> index 81ca2bc1f0be..d5cb4b82ad3d 100644
> --- a/drivers/usb/host/xhci-mem.c
> +++ b/drivers/usb/host/xhci-mem.c
> @@ -1835,6 +1835,7 @@ void xhci_free_erst(struct xhci_hcd *xhci, struct xhci_erst *erst)
>  void xhci_mem_cleanup(struct xhci_hcd *xhci)
>  {
>  	struct device	*dev = xhci_to_hcd(xhci)->self.sysdev;
> +	struct xhci_sec *sec, *tmp;
>  	int i, j, num_ports;
>  
>  	cancel_delayed_work_sync(&xhci->cmd_timer);
> @@ -1846,6 +1847,16 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
>  	xhci->event_ring = NULL;
>  	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed event ring");
>  
> +	list_for_each_entry_safe(sec, tmp, &xhci->xhci_sec_list, list) {
> +		list_del(&sec->list);
> +		if (sec->event_ring) {
> +			xhci_ring_free(xhci, sec->event_ring);
> +			xhci_dbg_trace(xhci, trace_xhci_dbg_init,
> +						"Freed secondary ring %d", sec->intr_num);

Odd indentation :(