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@quicinc.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 :(