diff options
| -rw-r--r-- | drivers/usb/host/xhci-mem.c | 75 | ||||
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 33 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.h | 2 |
3 files changed, 93 insertions, 17 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index c1800c7582b7..c37aa1ba9126 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -119,6 +119,34 @@ static void xhci_link_segments(struct xhci_hcd *xhci, struct xhci_segment *prev, } } +/* + * Link the ring to the new segments. + * Set Toggle Cycle for the new ring if needed. + */ +static void xhci_link_rings(struct xhci_hcd *xhci, struct xhci_ring *ring, + struct xhci_segment *first, struct xhci_segment *last, + unsigned int num_segs) +{ + struct xhci_segment *next; + + if (!ring || !first || !last) + return; + + next = ring->enq_seg->next; + xhci_link_segments(xhci, ring->enq_seg, first, ring->type); + xhci_link_segments(xhci, last, next, ring->type); + ring->num_segs += num_segs; + ring->num_trbs_free += (TRBS_PER_SEGMENT - 1) * num_segs; + + if (ring->type != TYPE_EVENT && ring->enq_seg == ring->last_seg) { + ring->last_seg->trbs[TRBS_PER_SEGMENT-1].link.control + &= ~cpu_to_le32(LINK_TOGGLE); + last->trbs[TRBS_PER_SEGMENT-1].link.control + |= cpu_to_le32(LINK_TOGGLE); + ring->last_seg = last; + } +} + /* XXX: Do we need the hcd structure in all these functions? */ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring) { @@ -287,6 +315,39 @@ static void xhci_reinit_cached_ring(struct xhci_hcd *xhci, INIT_LIST_HEAD(&ring->td_list); } +/* + * Expand an existing ring. + * Look for a cached ring or allocate a new ring which has same segment numbers + * and link the two rings. + */ +int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring, + unsigned int num_trbs, gfp_t flags) +{ + struct xhci_segment *first; + struct xhci_segment *last; + unsigned int num_segs; + unsigned int num_segs_needed; + int ret; + + num_segs_needed = (num_trbs + (TRBS_PER_SEGMENT - 1) - 1) / + (TRBS_PER_SEGMENT - 1); + + /* Allocate number of segments we needed, or double the ring size */ + num_segs = ring->num_segs > num_segs_needed ? + ring->num_segs : num_segs_needed; + + ret = xhci_alloc_segments_for_ring(xhci, &first, &last, + num_segs, ring->cycle_state, ring->type, flags); + if (ret) + return -ENOMEM; + + xhci_link_rings(xhci, ring, first, last, num_segs); + xhci_dbg(xhci, "ring expansion succeed, now has %d segments\n", + ring->num_segs); + + return 0; +} + #define CTX_SIZE(_hcc) (HCC_64BYTE_CONTEXT(_hcc) ? 64 : 32) static struct xhci_container_ctx *xhci_alloc_container_ctx(struct xhci_hcd *xhci, @@ -1361,18 +1422,8 @@ int xhci_endpoint_init(struct xhci_hcd *xhci, type = usb_endpoint_type(&ep->desc); /* Set up the endpoint ring */ - /* - * Isochronous endpoint ring needs bigger size because one isoc URB - * carries multiple packets and it will insert multiple tds to the - * ring. - * This should be replaced with dynamic ring resizing in the future. - */ - if (usb_endpoint_xfer_isoc(&ep->desc)) - virt_dev->eps[ep_index].new_ring = - xhci_ring_alloc(xhci, 8, 1, type, mem_flags); - else - virt_dev->eps[ep_index].new_ring = - xhci_ring_alloc(xhci, 1, 1, type, mem_flags); + virt_dev->eps[ep_index].new_ring = + xhci_ring_alloc(xhci, 1, 1, type, mem_flags); if (!virt_dev->eps[ep_index].new_ring) { /* Attempt to use the ring cache */ if (virt_dev->num_rings_cached == 0) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index f9b6fa364f22..4194f348e3a7 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2490,6 +2490,8 @@ static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, u32 ep_state, unsigned int num_trbs, gfp_t mem_flags) { + unsigned int num_trbs_needed; + /* Make sure the endpoint has been added to xHC schedule */ switch (ep_state) { case EP_STATE_DISABLED: @@ -2517,11 +2519,32 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, */ return -EINVAL; } - if (!room_on_ring(xhci, ep_ring, num_trbs)) { - /* FIXME allocate more room */ - xhci_err(xhci, "ERROR no room on ep ring\n"); - return -ENOMEM; - } + + while (1) { + if (room_on_ring(xhci, ep_ring, num_trbs)) + break; + + if (ep_ring == xhci->cmd_ring) { + xhci_err(xhci, "Do not support expand command ring\n"); + return -ENOMEM; + } + + if (ep_ring->enq_seg == ep_ring->deq_seg && + ep_ring->dequeue > ep_ring->enqueue) { + xhci_err(xhci, "Can not expand the ring while dequeue " + "pointer has not passed the link TRB\n"); + return -ENOMEM; + } + + xhci_dbg(xhci, "ERROR no room on ep ring, " + "try ring expansion\n"); + num_trbs_needed = num_trbs - ep_ring->num_trbs_free; + if (xhci_ring_expansion(xhci, ep_ring, num_trbs_needed, + mem_flags)) { + xhci_err(xhci, "Ring expansion failed\n"); + return -ENOMEM; + } + }; if (enqueue_is_link_trb(ep_ring)) { struct xhci_ring *ring = ep_ring; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index ea8fc237d158..57cd632064b4 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1622,6 +1622,8 @@ int xhci_endpoint_init(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_device *udev, struct usb_host_endpoint *ep, gfp_t mem_flags); void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring); +int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring, + unsigned int num_trbs, gfp_t flags); void xhci_free_or_cache_endpoint_ring(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, unsigned int ep_index); |