xHCI: dynamic ring expansion

If room_on_ring() check fails, try to expand the ring and check again.

When expand a ring, use a cached ring or allocate new segments, link
the original ring and the new ring or segments, update the original ring's
segment numbers and the last segment pointer.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Paul Zimmerman <Paul.Zimmerman@synopsys.com>

1 files changed, 63 insertions, 12 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)