/* * Allocates a generic ring segment from the ring pool, sets the dma address, * initializes the segment to zero, and sets the private next pointer to NULL. * * Section 4.11.1.1: * "All components of all Command and Transfer TRBs shall be initialized to '0'"
*/ staticstruct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci, unsignedint max_packet, unsignedint num,
gfp_t flags)
{ struct xhci_segment *seg;
dma_addr_t dma; struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
seg = kzalloc_node(sizeof(*seg), flags, dev_to_node(dev)); if (!seg) return NULL;
ring->last_seg->next = NULL;
seg = ring->first_seg;
while (seg) {
next = seg->next;
xhci_segment_free(xhci, seg);
seg = next;
}
}
/* * Only for transfer and command rings where driver is the producer, not for * event rings. * * Change the last TRB in the segment to be a Link TRB which points to the * DMA address of the next segment. The caller needs to set any Link TRB * related flags, such as End TRB, Toggle Cycle, and no snoop.
*/ staticvoid xhci_set_link_trb(struct xhci_segment *seg, bool chain_links)
{ union xhci_trb *trb;
u32 val;
if (!seg || !seg->next) return;
trb = &seg->trbs[TRBS_PER_SEGMENT - 1];
/* Set the last TRB in the segment to have a TRB type ID of Link TRB */
val = le32_to_cpu(trb->link.control);
val &= ~TRB_TYPE_BITMASK;
val |= TRB_TYPE(TRB_LINK); if (chain_links)
val |= TRB_CHAIN;
trb->link.control = cpu_to_le32(val);
trb->link.segment_ptr = cpu_to_le64(seg->next->dma);
}
/* See section 4.9.2.1 and 6.4.4.1 */
ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |= cpu_to_le32(LINK_TOGGLE);
}
/* * Link the src ring segments to the dst ring. * Set Toggle Cycle for the new ring if needed.
*/ staticvoid xhci_link_rings(struct xhci_hcd *xhci, struct xhci_ring *src, struct xhci_ring *dst)
{ struct xhci_segment *seg; bool chain_links;
if (!src || !dst) return;
/* If the cycle state is 0, set the cycle bit to 1 for all the TRBs */ if (dst->cycle_state == 0) {
xhci_for_each_ring_seg(src->first_seg, seg) { for (int i = 0; i < TRBS_PER_SEGMENT; i++)
seg->trbs[i].link.control |= cpu_to_le32(TRB_CYCLE);
}
}
for (seg = dst->enq_seg; seg != dst->last_seg; seg = seg->next)
seg->next->num = seg->num + 1;
}
/* * We need a radix tree for mapping physical addresses of TRBs to which stream * ID they belong to. We need to do this because the host controller won't tell * us which stream ring the TRB came from. We could store the stream ID in an * event data TRB, but that doesn't help us for the cancellation case, since the * endpoint may stop before it reaches that event data TRB. * * The radix tree maps the upper portion of the TRB DMA address to a ring * segment that has the same upper portion of DMA addresses. For example, say I * have segments of size 1KB, that are always 1KB aligned. A segment may * start at 0x10c91000 and end at 0x10c913f0. If I use the upper 10 bits, the * key to the stream ID is 0x43244. I can use the DMA address of the TRB to * pass the radix tree a key to get the right stream ID: * * 0x10c90fff >> 10 = 0x43243 * 0x10c912c0 >> 10 = 0x43244 * 0x10c91400 >> 10 = 0x43245 * * Obviously, only those TRBs with DMA addresses that are within the segment * will make the radix tree return the stream ID for that ring. * * Caveats for the radix tree: * * The radix tree uses an unsigned long as a key pair. On 32-bit systems, an * unsigned long will be 32-bits; on a 64-bit system an unsigned long will be * 64-bits. Since we only request 32-bit DMA addresses, we can use that as the * key on 32-bit or 64-bit systems (it would also be fine if we asked for 64-bit * PCI DMA addresses on a 64-bit system). There might be a problem on 32-bit * extended systems (where the DMA address can be bigger than 32-bits), * if we allow the PCI dma mask to be bigger than 32-bits. So don't do that.
*/ staticint xhci_insert_segment_mapping(struct radix_tree_root *trb_address_map, struct xhci_ring *ring, struct xhci_segment *seg,
gfp_t mem_flags)
{ unsignedlong key; int ret;
key = (unsignedlong)(seg->dma >> TRB_SEGMENT_SHIFT); /* Skip any segments that were already added. */ if (radix_tree_lookup(trb_address_map, key)) return 0;
ret = radix_tree_maybe_preload(mem_flags); if (ret) return ret;
ret = radix_tree_insert(trb_address_map,
key, ring);
radix_tree_preload_end(); return ret;
}
/* XXX: Do we need the hcd structure in all these functions? */ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring)
{ if (!ring) return;
trace_xhci_ring_free(ring);
if (ring->first_seg) { if (ring->type == TYPE_STREAM)
xhci_remove_stream_mapping(ring);
xhci_ring_segments_free(xhci, ring);
}
kfree(ring);
}
void xhci_initialize_ring_info(struct xhci_ring *ring)
{ /* The ring is empty, so the enqueue pointer == dequeue pointer */
ring->enqueue = ring->first_seg->trbs;
ring->enq_seg = ring->first_seg;
ring->dequeue = ring->enqueue;
ring->deq_seg = ring->first_seg; /* The ring is initialized to 0. The producer must write 1 to the cycle * bit to handover ownership of the TRB, so PCS = 1. The consumer must * compare CCS to the cycle bit to check ownership, so CCS = 1. * * New rings are initialized with cycle state equal to 1; if we are * handling ring expansion, set the cycle state equal to the old ring.
*/
ring->cycle_state = 1;
/* * Each segment has a link TRB, and leave an extra TRB for SW * accounting purpose
*/
ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
}
EXPORT_SYMBOL_GPL(xhci_initialize_ring_info);
/* Allocate segments and link them for a ring */ staticint xhci_alloc_segments_for_ring(struct xhci_hcd *xhci, struct xhci_ring *ring, gfp_t flags)
{ struct xhci_segment *prev; unsignedint num = 0;
/* * Create a new ring with zero or more segments. * * Link each segment together into a ring. * Set the end flag and the cycle toggle bit on the last segment. * See section 4.9.1 and figures 15 and 16.
*/ struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci, unsignedint num_segs, enum xhci_ring_type type, unsignedint max_packet, gfp_t flags)
{ struct xhci_ring *ring; int ret; struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
ring = kzalloc_node(sizeof(*ring), flags, dev_to_node(dev)); if (!ring) return NULL;
/* * Expand an existing ring. * 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, unsignedint num_new_segs, gfp_t flags)
{ struct xhci_ring new_ring; int ret;
if (num_new_segs == 0) return 0;
new_ring.num_segs = num_new_segs;
new_ring.bounce_buf_len = ring->bounce_buf_len;
new_ring.type = ring->type;
ret = xhci_alloc_segments_for_ring(xhci, &new_ring, flags); if (ret) return -ENOMEM;
xhci_initialize_ring_segments(xhci, &new_ring);
if (ring->type == TYPE_STREAM) {
ret = xhci_update_stream_segment_mapping(ring->trb_address_map, ring,
new_ring.first_seg, flags); if (ret) goto free_segments;
}
xhci_link_rings(xhci, &new_ring, ring);
trace_xhci_ring_expansion(ring);
xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion, "ring expansion succeed, now has %d segments",
ring->num_segs);
struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsignedint ep_index)
{ /* increment ep index by offset of start of ep ctx array */
ep_index++; if (ctx->type == XHCI_CTX_TYPE_INPUT)
ep_index++;
/* * The stream context array for each endpoint with bulk streams enabled can * vary in size, based on: * - how many streams the endpoint supports, * - the maximum primary stream array size the host controller supports, * - and how many streams the device driver asks for. * * The stream context array must be a power of 2, and can be as small as * 64 bytes or as large as 1MB.
*/ staticstruct xhci_stream_ctx *xhci_alloc_stream_ctx(struct xhci_hcd *xhci, unsignedint num_stream_ctxs, dma_addr_t *dma,
gfp_t mem_flags)
{ struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
size_t size = array_size(sizeof(struct xhci_stream_ctx), num_stream_ctxs);
/* * Change an endpoint's internal structure so it supports stream IDs. The * number of requested streams includes stream 0, which cannot be used by device * drivers. * * The number of stream contexts in the stream context array may be bigger than * the number of streams the driver wants to use. This is because the number of * stream context array entries must be a power of two.
*/ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci, unsignedint num_stream_ctxs, unsignedint num_streams, unsignedint max_packet, gfp_t mem_flags)
{ struct xhci_stream_info *stream_info;
u32 cur_stream; struct xhci_ring *cur_ring;
u64 addr; int ret; struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
xhci_dbg(xhci, "Allocating %u streams and %u stream context array entries.\n",
num_streams, num_stream_ctxs); if (xhci->cmd_ring_reserved_trbs == MAX_RSVD_CMD_TRBS) {
xhci_dbg(xhci, "Command ring has no reserved TRBs available\n"); return NULL;
}
xhci->cmd_ring_reserved_trbs++;
stream_info = kzalloc_node(sizeof(*stream_info), mem_flags,
dev_to_node(dev)); if (!stream_info) goto cleanup_trbs;
/* Initialize the array of virtual pointers to stream rings. */
stream_info->stream_rings = kcalloc_node(
num_streams, sizeof(struct xhci_ring *), mem_flags,
dev_to_node(dev)); if (!stream_info->stream_rings) goto cleanup_info;
/* Initialize the array of DMA addresses for stream rings for the HW. */
stream_info->stream_ctx_array = xhci_alloc_stream_ctx(xhci,
num_stream_ctxs, &stream_info->ctx_array_dma,
mem_flags); if (!stream_info->stream_ctx_array) goto cleanup_ring_array;
/* Allocate everything needed to free the stream rings later */
stream_info->free_streams_command =
xhci_alloc_command_with_ctx(xhci, true, mem_flags); if (!stream_info->free_streams_command) goto cleanup_ctx;
/* Allocate rings for all the streams that the driver will use, * and add their segment DMA addresses to the radix tree. * Stream 0 is reserved.
*/
for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
stream_info->stream_rings[cur_stream] =
xhci_ring_alloc(xhci, 2, TYPE_STREAM, max_packet, mem_flags);
cur_ring = stream_info->stream_rings[cur_stream]; if (!cur_ring) goto cleanup_rings;
cur_ring->stream_id = cur_stream;
cur_ring->trb_address_map = &stream_info->trb_address_map; /* Set deq ptr, cycle bit, and stream context type */
addr = cur_ring->first_seg->dma |
SCT_FOR_CTX(SCT_PRI_TR) |
cur_ring->cycle_state;
stream_info->stream_ctx_array[cur_stream].stream_ring =
cpu_to_le64(addr);
xhci_dbg(xhci, "Setting stream %d ring ptr to 0x%08llx\n", cur_stream, addr);
ret = xhci_update_stream_mapping(cur_ring, mem_flags);
trace_xhci_alloc_stream_info_ctx(stream_info, cur_stream); if (ret) {
xhci_ring_free(xhci, cur_ring);
stream_info->stream_rings[cur_stream] = NULL; goto cleanup_rings;
}
} /* Leave the other unused stream ring pointers in the stream context * array initialized to zero. This will cause the xHC to give us an * error if the device asks for a stream ID we don't have setup (if it * was any other way, the host controller would assume the ring is * "empty" and wait forever for data to be queued to that stream ID).
*/
return stream_info;
cleanup_rings: for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
cur_ring = stream_info->stream_rings[cur_stream]; if (cur_ring) {
xhci_ring_free(xhci, cur_ring);
stream_info->stream_rings[cur_stream] = NULL;
}
}
xhci_free_command(xhci, stream_info->free_streams_command);
cleanup_ctx:
xhci_free_stream_ctx(xhci,
stream_info->num_stream_ctxs,
stream_info->stream_ctx_array,
stream_info->ctx_array_dma);
cleanup_ring_array:
kfree(stream_info->stream_rings);
cleanup_info:
kfree(stream_info);
cleanup_trbs:
xhci->cmd_ring_reserved_trbs--; return NULL;
} /* * Sets the MaxPStreams field and the Linear Stream Array field. * Sets the dequeue pointer to the stream context array.
*/ void xhci_setup_streams_ep_input_ctx(struct xhci_hcd *xhci, struct xhci_ep_ctx *ep_ctx, struct xhci_stream_info *stream_info)
{
u32 max_primary_streams; /* MaxPStreams is the number of stream context array entries, not the * number we're actually using. Must be in 2^(MaxPstreams + 1) format. * fls(0) = 0, fls(0x1) = 1, fls(0x10) = 2, fls(0x100) = 3, etc.
*/
max_primary_streams = fls(stream_info->num_stream_ctxs) - 2;
xhci_dbg_trace(xhci, trace_xhci_dbg_context_change, "Setting number of stream ctx array entries to %u",
1 << (max_primary_streams + 1));
ep_ctx->ep_info &= cpu_to_le32(~EP_MAXPSTREAMS_MASK);
ep_ctx->ep_info |= cpu_to_le32(EP_MAXPSTREAMS(max_primary_streams)
| EP_HAS_LSA);
ep_ctx->deq = cpu_to_le64(stream_info->ctx_array_dma);
}
/* * Sets the MaxPStreams field and the Linear Stream Array field to 0. * Reinstalls the "normal" endpoint ring (at its previous dequeue mark, * not at the beginning of the ring).
*/ void xhci_setup_no_streams_ep_input_ctx(struct xhci_ep_ctx *ep_ctx, struct xhci_virt_ep *ep)
{
dma_addr_t addr;
ep_ctx->ep_info &= cpu_to_le32(~(EP_MAXPSTREAMS_MASK | EP_HAS_LSA));
addr = xhci_trb_virt_to_dma(ep->ring->deq_seg, ep->ring->dequeue);
ep_ctx->deq = cpu_to_le64(addr | ep->ring->cycle_state);
}
/* Frees all stream contexts associated with the endpoint, * * Caller should fix the endpoint context streams fields.
*/ void xhci_free_stream_info(struct xhci_hcd *xhci, struct xhci_stream_info *stream_info)
{ int cur_stream; struct xhci_ring *cur_ring;
/* If the device never made it past the Set Address stage, * it may not have the root hub port pointer set correctly.
*/ if (!virt_dev->rhub_port) {
xhci_dbg(xhci, "Bad rhub port.\n"); return;
}
tt_list_head = &(xhci->rh_bw[virt_dev->rhub_port->hw_portnum].tts);
list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) { /* Multi-TT hubs will have more than one entry */ if (tt_info->slot_id == slot_id) {
slot_found = true;
list_del(&tt_info->tt_list);
kfree(tt_info);
} elseif (slot_found) { break;
}
}
}
int xhci_alloc_tt_info(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_device *hdev, struct usb_tt *tt, gfp_t mem_flags)
{ struct xhci_tt_bw_info *tt_info; unsignedint num_ports; int i, j; struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
if (!tt->multi)
num_ports = 1; else
num_ports = hdev->maxchild;
for (i = 0; i < num_ports; i++, tt_info++) { struct xhci_interval_bw_table *bw_table;
/* All the xhci_tds in the ring's TD list should be freed at this point. * Should be called with xhci->lock held if there is any chance the TT lists * will be manipulated by the configure endpoint, allocate device, or update * hub functions while this function is removing the TT entries from the list.
*/ void xhci_free_virt_device(struct xhci_hcd *xhci, struct xhci_virt_device *dev, int slot_id)
{ int i; int old_active_eps = 0;
/* Slot ID 0 is reserved */ if (slot_id == 0 || !dev) return;
/* If device ctx array still points to _this_ device, clear it */ if (dev->out_ctx &&
xhci->dcbaa->dev_context_ptrs[slot_id] == cpu_to_le64(dev->out_ctx->dma))
xhci->dcbaa->dev_context_ptrs[slot_id] = 0;
trace_xhci_free_virt_device(dev);
if (dev->tt_info)
old_active_eps = dev->tt_info->active_eps;
for (i = 0; i < 31; i++) { if (dev->eps[i].ring)
xhci_ring_free(xhci, dev->eps[i].ring); if (dev->eps[i].stream_info)
xhci_free_stream_info(xhci,
dev->eps[i].stream_info); /* * Endpoints are normally deleted from the bandwidth list when * endpoints are dropped, before device is freed. * If host is dying or being removed then endpoints aren't * dropped cleanly, so delete the endpoint from list here. * Only applicable for hosts with software bandwidth checking.
*/
if (!list_empty(&dev->eps[i].bw_endpoint_list)) {
list_del_init(&dev->eps[i].bw_endpoint_list);
xhci_dbg(xhci, "Slot %u endpoint %u not removed from BW list!\n",
slot_id, i);
}
} /* If this is a hub, free the TT(s) from the TT list */
xhci_free_tt_info(xhci, dev, slot_id); /* If necessary, update the number of active TTs on this root port */
xhci_update_tt_active_eps(xhci, dev, old_active_eps);
if (dev->in_ctx)
xhci_free_container_ctx(xhci, dev->in_ctx); if (dev->out_ctx)
xhci_free_container_ctx(xhci, dev->out_ctx);
if (dev->udev && dev->udev->slot_id)
dev->udev->slot_id = 0; if (dev->rhub_port && dev->rhub_port->slot_id == slot_id)
dev->rhub_port->slot_id = 0; if (xhci->devs[slot_id] == dev)
xhci->devs[slot_id] = NULL;
kfree(dev);
}
/* * Free a virt_device structure. * If the virt_device added a tt_info (a hub) and has children pointing to * that tt_info, then free the child first. Recursive. * We can't rely on udev at this point to find child-parent relationships.
*/ staticvoid xhci_free_virt_devices_depth_first(struct xhci_hcd *xhci, int slot_id)
{ struct xhci_virt_device *vdev; struct list_head *tt_list_head; struct xhci_tt_bw_info *tt_info, *next; int i;
vdev = xhci->devs[slot_id]; if (!vdev) return;
if (!vdev->rhub_port) {
xhci_dbg(xhci, "Bad rhub port.\n"); goto out;
}
tt_list_head = &(xhci->rh_bw[vdev->rhub_port->hw_portnum].tts);
list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) { /* is this a hub device that added a tt_info to the tts list */ if (tt_info->slot_id == slot_id) { /* are any devices using this tt_info? */ for (i = 1; i < HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
vdev = xhci->devs[i]; if (vdev && (vdev->tt_info == tt_info))
xhci_free_virt_devices_depth_first(
xhci, i);
}
}
}
out: /* we are now at a leaf device */
xhci_debugfs_remove_slot(xhci, slot_id);
xhci_free_virt_device(xhci, xhci->devs[slot_id], slot_id);
}
int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id, struct usb_device *udev, gfp_t flags)
{ struct xhci_virt_device *dev; int i;
/* Slot ID 0 is reserved */ if (slot_id == 0 || xhci->devs[slot_id]) {
xhci_warn(xhci, "Bad Slot ID %d\n", slot_id); return 0;
}
dev = kzalloc(sizeof(*dev), flags); if (!dev) return 0;
dev->slot_id = slot_id;
/* Allocate the (output) device context that will be used in the HC. */
dev->out_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_DEVICE, flags); if (!dev->out_ctx) goto fail;
/* Initialize the cancellation and bandwidth list for each ep */ for (i = 0; i < 31; i++) {
dev->eps[i].ep_index = i;
dev->eps[i].vdev = dev;
dev->eps[i].xhci = xhci;
INIT_LIST_HEAD(&dev->eps[i].cancelled_td_list);
INIT_LIST_HEAD(&dev->eps[i].bw_endpoint_list);
}
/* Allocate endpoint 0 ring */
dev->eps[0].ring = xhci_ring_alloc(xhci, 2, TYPE_CTRL, 0, flags); if (!dev->eps[0].ring) goto fail;
dev->udev = udev;
/* Point to output device context in dcbaa. */
xhci->dcbaa->dev_context_ptrs[slot_id] = cpu_to_le64(dev->out_ctx->dma);
xhci_dbg(xhci, "Set slot id %d dcbaa entry %p to 0x%llx\n",
slot_id,
&xhci->dcbaa->dev_context_ptrs[slot_id],
le64_to_cpu(xhci->dcbaa->dev_context_ptrs[slot_id]));
trace_xhci_alloc_virt_device(dev);
xhci->devs[slot_id] = dev;
return 1;
fail:
if (dev->in_ctx)
xhci_free_container_ctx(xhci, dev->in_ctx); if (dev->out_ctx)
xhci_free_container_ctx(xhci, dev->out_ctx);
kfree(dev);
virt_dev = xhci->devs[udev->slot_id];
ep0_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, 0);
ep_ring = virt_dev->eps[0].ring; /* * FIXME we don't keep track of the dequeue pointer very well after a * Set TR dequeue pointer, so we're setting the dequeue pointer of the * host to our enqueue pointer. This should only be called after a * configured device has reset, so all control transfers should have * been completed or cancelled before the reset.
*/
ep0_ctx->deq = cpu_to_le64(xhci_trb_virt_to_dma(ep_ring->enq_seg,
ep_ring->enqueue)
| ep_ring->cycle_state);
}
/* * The xHCI roothub may have ports of differing speeds in any order in the port * status registers. * * The xHCI hardware wants to know the roothub port that the USB device * is attached to (or the roothub port its ancestor hub is attached to). All we * know is the index of that port under either the USB 2.0 or the USB 3.0 * roothub, but that doesn't give us the real index into the HW port status * registers.
*/ staticstruct xhci_port *xhci_find_rhub_port(struct xhci_hcd *xhci, struct usb_device *udev)
{ struct usb_device *top_dev; struct xhci_hub *rhub; struct usb_hcd *hcd;
/* Setup an xHCI virtual device for a Set Address command */ int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev)
{ struct xhci_virt_device *dev; struct xhci_ep_ctx *ep0_ctx; struct xhci_slot_ctx *slot_ctx;
u32 max_packets;
dev = xhci->devs[udev->slot_id]; /* Slot ID 0 is reserved */ if (udev->slot_id == 0 || !dev) {
xhci_warn(xhci, "Slot ID %d is not assigned to this device\n",
udev->slot_id); return -EINVAL;
}
ep0_ctx = xhci_get_ep_ctx(xhci, dev->in_ctx, 0);
slot_ctx = xhci_get_slot_ctx(xhci, dev->in_ctx);
/* 3) Only the control endpoint is valid - one endpoint context */
slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1) | udev->route); switch (udev->speed) { case USB_SPEED_SUPER_PLUS:
slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SSP);
max_packets = MAX_PACKET(512); break; case USB_SPEED_SUPER:
slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SS);
max_packets = MAX_PACKET(512); break; case USB_SPEED_HIGH:
slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_HS);
max_packets = MAX_PACKET(64); break; /* USB core guesses at a 64-byte max packet first for FS devices */ case USB_SPEED_FULL:
slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_FS);
max_packets = MAX_PACKET(64); break; case USB_SPEED_LOW:
slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_LS);
max_packets = MAX_PACKET(8); break; default: /* Speed was set earlier, this shouldn't happen. */ return -EINVAL;
} /* Find the root hub port this device is under */
dev->rhub_port = xhci_find_rhub_port(xhci, udev); if (!dev->rhub_port) return -EINVAL; /* Slot ID is set to the device directly below the root hub */ if (!udev->parent->parent)
dev->rhub_port->slot_id = udev->slot_id;
slot_ctx->dev_info2 |= cpu_to_le32(ROOT_HUB_PORT(dev->rhub_port->hw_portnum + 1));
xhci_dbg(xhci, "Slot ID %d: HW portnum %d, hcd portnum %d\n",
udev->slot_id, dev->rhub_port->hw_portnum, dev->rhub_port->hcd_portnum);
/* Find the right bandwidth table that this device will be a part of. * If this is a full speed device attached directly to a root port (or a * decendent of one), it counts as a primary bandwidth domain, not a * secondary bandwidth domain under a TT. An xhci_tt_info structure * will never be created for the HS root hub.
*/ if (!udev->tt || !udev->tt->hub->parent) {
dev->bw_table = &xhci->rh_bw[dev->rhub_port->hw_portnum].bw_table;
} else { struct xhci_root_port_bw_info *rh_bw; struct xhci_tt_bw_info *tt_bw;
rh_bw = &xhci->rh_bw[dev->rhub_port->hw_portnum]; /* Find the right TT. */
list_for_each_entry(tt_bw, &rh_bw->tts, tt_list) { if (tt_bw->slot_id != udev->tt->hub->slot_id) continue;
if (!dev->udev->tt->multi ||
(udev->tt->multi &&
tt_bw->ttport == dev->udev->ttport)) {
dev->bw_table = &tt_bw->bw_table;
dev->tt_info = tt_bw; break;
}
} if (!dev->tt_info)
xhci_warn(xhci, "WARN: Didn't find a matching TT\n");
}
/* Is this a LS/FS device under an external HS hub? */ if (udev->tt && udev->tt->hub->parent) {
slot_ctx->tt_info = cpu_to_le32(udev->tt->hub->slot_id |
(udev->ttport << 8)); if (udev->tt->multi)
slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
}
xhci_dbg(xhci, "udev->tt = %p\n", udev->tt);
xhci_dbg(xhci, "udev->ttport = 0x%x\n", udev->ttport);
if (udev->speed == USB_SPEED_FULL) { /* * Full speed isoc endpoints specify interval in frames, * not microframes. We are using microframes everywhere, * so adjust accordingly.
*/
interval += 3; /* 1 frame = 2^3 uframes */
}
return interval;
}
/* * Convert bInterval expressed in microframes (in 1-255 range) to exponent of * microframes, rounded down to nearest power of 2.
*/ staticunsignedint xhci_microframes_to_exponent(struct usb_device *udev, struct usb_host_endpoint *ep, unsignedint desc_interval, unsignedint min_exponent, unsignedint max_exponent)
{ unsignedint interval;
/* Return the polling or NAK interval. * * The polling interval is expressed in "microframes". If xHCI's Interval field * is set to N, it will service the endpoint every 2^(Interval)*125us. * * The NAK interval is one NAK per 1 to 255 microframes, or no NAKs if interval * is set to 0.
*/ staticunsignedint xhci_get_endpoint_interval(struct usb_device *udev, struct usb_host_endpoint *ep)
{ unsignedint interval = 0;
switch (udev->speed) { case USB_SPEED_HIGH: /* Max NAK rate */ if (usb_endpoint_xfer_control(&ep->desc) ||
usb_endpoint_xfer_bulk(&ep->desc)) {
interval = xhci_parse_microframe_interval(udev, ep); break;
}
fallthrough; /* SS and HS isoc/int have same decoding */
case USB_SPEED_SUPER_PLUS: case USB_SPEED_SUPER: if (usb_endpoint_xfer_int(&ep->desc) ||
usb_endpoint_xfer_isoc(&ep->desc)) {
interval = xhci_parse_exponent_interval(udev, ep);
} break;
case USB_SPEED_FULL: if (usb_endpoint_xfer_isoc(&ep->desc)) {
interval = xhci_parse_exponent_interval(udev, ep); break;
} /* * Fall through for interrupt endpoint interval decoding * since it uses the same rules as low speed interrupt * endpoints.
*/
fallthrough;
case USB_SPEED_LOW: if (usb_endpoint_xfer_int(&ep->desc) ||
usb_endpoint_xfer_isoc(&ep->desc)) {
/* The "Mult" field in the endpoint context is only set for SuperSpeed isoc eps. * High speed endpoint descriptors can define "the number of additional * transaction opportunities per microframe", but that goes in the Max Burst * endpoint context field.
*/ static u32 xhci_get_endpoint_mult(struct usb_device *udev, struct usb_host_endpoint *ep)
{ if (udev->speed < USB_SPEED_SUPER ||
!usb_endpoint_xfer_isoc(&ep->desc)) return 0; return ep->ss_ep_comp.bmAttributes;
}
static u32 xhci_get_endpoint_max_burst(struct usb_device *udev, struct usb_host_endpoint *ep)
{ /* Super speed and Plus have max burst in ep companion desc */ if (udev->speed >= USB_SPEED_SUPER) return ep->ss_ep_comp.bMaxBurst;
static u32 xhci_get_endpoint_type(struct usb_host_endpoint *ep)
{ int in;
in = usb_endpoint_dir_in(&ep->desc);
switch (usb_endpoint_type(&ep->desc)) { case USB_ENDPOINT_XFER_CONTROL: return CTRL_EP; case USB_ENDPOINT_XFER_BULK: return in ? BULK_IN_EP : BULK_OUT_EP; case USB_ENDPOINT_XFER_ISOC: return in ? ISOC_IN_EP : ISOC_OUT_EP; case USB_ENDPOINT_XFER_INT: return in ? INT_IN_EP : INT_OUT_EP;
} return 0;
}
/* Return the maximum endpoint service interval time (ESIT) payload. * Basically, this is the maxpacket size, multiplied by the burst size * and mult size.
*/ static u32 xhci_get_max_esit_payload(struct usb_device *udev, struct usb_host_endpoint *ep)
{ int max_burst; int max_packet;
/* Only applies for interrupt or isochronous endpoints */ if (usb_endpoint_xfer_control(&ep->desc) ||
usb_endpoint_xfer_bulk(&ep->desc)) return 0;
/* SuperSpeedPlus Isoc ep sending over 48k per esit */ if ((udev->speed >= USB_SPEED_SUPER_PLUS) &&
USB_SS_SSP_ISOC_COMP(ep->ss_ep_comp.bmAttributes)) return le32_to_cpu(ep->ssp_isoc_ep_comp.dwBytesPerInterval);
/* SuperSpeed or SuperSpeedPlus Isoc ep with less than 48k per esit */ if (udev->speed >= USB_SPEED_SUPER) return le16_to_cpu(ep->ss_ep_comp.wBytesPerInterval);
max_packet = usb_endpoint_maxp(&ep->desc);
max_burst = usb_endpoint_maxp_mult(&ep->desc); /* A 0 in max burst means 1 transfer per ESIT */ return max_packet * max_burst;
}
/* Set up an endpoint with one ring segment. Do not allocate stream rings. * Drivers will have to call usb_alloc_streams() to do that.
*/ 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)
{ unsignedint ep_index; struct xhci_ep_ctx *ep_ctx; struct xhci_ring *ep_ring; unsignedint max_packet; enum xhci_ring_type ring_type;
u32 max_esit_payload;
u32 endpoint_type; unsignedint max_burst; unsignedint interval; unsignedint mult; unsignedint avg_trb_len; unsignedint err_count = 0;
endpoint_type = xhci_get_endpoint_type(ep); if (!endpoint_type) return -EINVAL;
ring_type = usb_endpoint_type(&ep->desc);
/* * Get values to fill the endpoint context, mostly from ep descriptor. * The average TRB buffer lengt for bulk endpoints is unclear as we * have no clue on scatter gather list entry size. For Isoc and Int, * set it to max available. See xHCI 1.1 spec 4.14.1.1 for details.
*/
max_esit_payload = xhci_get_max_esit_payload(udev, ep);
interval = xhci_get_endpoint_interval(udev, ep);
/* FIXME dig Mult and streams info out of ep companion desc */
/* Allow 3 retries for everything but isoc, set CErr = 3 */ if (!usb_endpoint_xfer_isoc(&ep->desc))
err_count = 3; /* HS bulk max packet should be 512, FS bulk supports 8, 16, 32 or 64 */ if (usb_endpoint_xfer_bulk(&ep->desc)) { if (udev->speed == USB_SPEED_HIGH)
max_packet = 512; if (udev->speed == USB_SPEED_FULL) {
max_packet = rounddown_pow_of_two(max_packet);
max_packet = clamp_val(max_packet, 8, 64);
}
} /* xHCI 1.0 and 1.1 indicates that ctrl ep avg TRB Length should be 8 */ if (usb_endpoint_xfer_control(&ep->desc) && xhci->hci_version >= 0x100)
avg_trb_len = 8; /* xhci 1.1 with LEC support doesn't use mult field, use RsvdZ */ if ((xhci->hci_version > 0x100) && HCC2_LEC(xhci->hcc_params2))
mult = 0;
/* Set up the endpoint ring */
virt_dev->eps[ep_index].new_ring =
xhci_ring_alloc(xhci, 2, ring_type, max_packet, mem_flags); if (!virt_dev->eps[ep_index].new_ring) return -ENOMEM;
ep_ctx->ep_info = 0;
ep_ctx->ep_info2 = 0;
ep_ctx->deq = 0;
ep_ctx->tx_info = 0; /* Don't free the endpoint ring until the set interface or configuration * request succeeds.
*/
}
for (i = 1; i < 31; i++) {
bw_info = &virt_dev->eps[i].bw_info;
/* We can't tell what endpoint type is being dropped, but * unconditionally clearing the bandwidth info for non-periodic * endpoints should be harmless because the info will never be * set in the first place.
*/ if (!EP_IS_ADDED(ctrl_ctx, i) && EP_IS_DROPPED(ctrl_ctx, i)) { /* Dropped endpoint */
xhci_clear_endpoint_bw_info(bw_info); continue;
}
/* Added or changed endpoint */
bw_info->ep_interval = CTX_TO_EP_INTERVAL(
le32_to_cpu(ep_ctx->ep_info)); /* Number of packets and mult are zero-based in the * input context, but we want one-based for the * interval table.
*/
bw_info->mult = CTX_TO_EP_MULT(
le32_to_cpu(ep_ctx->ep_info)) + 1;
bw_info->num_packets = CTX_TO_MAX_BURST(
le32_to_cpu(ep_ctx->ep_info2)) + 1;
bw_info->max_packet_size = MAX_PACKET_DECODED(
le32_to_cpu(ep_ctx->ep_info2));
bw_info->type = ep_type;
bw_info->max_esit_payload = CTX_TO_MAX_ESIT_PAYLOAD(
le32_to_cpu(ep_ctx->tx_info));
}
}
}
/* Copy output xhci_ep_ctx to the input xhci_ep_ctx copy. * Useful when you want to change one particular aspect of the endpoint and then * issue a configure endpoint command.
*/ void xhci_endpoint_copy(struct xhci_hcd *xhci, struct xhci_container_ctx *in_ctx, struct xhci_container_ctx *out_ctx, unsignedint ep_index)
{ struct xhci_ep_ctx *out_ep_ctx; struct xhci_ep_ctx *in_ep_ctx;
/* Copy output xhci_slot_ctx to the input xhci_slot_ctx. * Useful when you want to change one particular aspect of the endpoint and then * issue a configure endpoint command. Only the context entries field matters, * but we'll copy the whole thing anyway.
*/ void xhci_slot_copy(struct xhci_hcd *xhci, struct xhci_container_ctx *in_ctx, struct xhci_container_ctx *out_ctx)
{ struct xhci_slot_ctx *in_slot_ctx; struct xhci_slot_ctx *out_slot_ctx;
/* Set up the scratchpad buffer array and scratchpad buffers, if needed. */ staticint scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags)
{ int i; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; int num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2);
/* * Clean out interrupter registers except ERSTBA. Clearing either the * low or high 32 bits of ERSTBA immediately causes the controller to * dereference the partially cleared 64 bit address, causing IOMMU error.
*/ if (ir->ir_set) {
tmp = readl(&ir->ir_set->erst_size);
tmp &= ~ERST_SIZE_MASK;
writel(tmp, &ir->ir_set->erst_size);
/* interrupter 0 is primary interrupter, don't touch it */ if (!ir || !ir->intr_num || ir->intr_num >= xhci->max_interrupters) {
xhci_dbg(xhci, "Invalid secondary interrupter, can't remove\n");
spin_unlock_irq(&xhci->lock); return;
}
/* * Cleanup secondary interrupter to ensure there are no pending events. * This also updates event ring dequeue pointer back to the start.
*/
xhci_skip_sec_intr_events(xhci, ir->event_ring, ir);
intr_num = ir->intr_num;
deq = xhci_trb_virt_to_dma(ir->event_ring->deq_seg,
ir->event_ring->dequeue); if (!deq)
xhci_warn(xhci, "WARN something wrong with SW event ring dequeue ptr.\n"); /* Update HC event ring dequeue pointer */ /* Don't clear the EHB bit (which is RW1C) because * there might be more events to service.
*/
xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Write event ring dequeue pointer, preserving EHB bit");
xhci_write_64(xhci, deq & ERST_PTR_MASK, &ir->ir_set->erst_dequeue);
}
if (major_revision == 0x03) {
rhub = &xhci->usb3_rhub; /* * Some hosts incorrectly use sub-minor version for minor * version (i.e. 0x02 instead of 0x20 for bcdUSB 0x320 and 0x01 * for bcdUSB 0x310). Since there is no USB release with sub * minor version 0x301 to 0x309, we can assume that they are * incorrect and fix it here.
*/ if (minor_revision > 0x00 && minor_revision < 0x10)
minor_revision <<= 4; /* * Some zhaoxin's xHCI controller that follow usb3.1 spec * but only support Gen1.
*/ if (xhci->quirks & XHCI_ZHAOXIN_HOST) {
tmp_minor_revision = minor_revision;
minor_revision = 0;
}
} elseif (major_revision <= 0x02) {
rhub = &xhci->usb2_rhub;
} else {
xhci_warn(xhci, "Ignoring unknown port speed, Ext Cap %p, revision = 0x%x\n",
addr, major_revision); /* Ignoring port protocol we can't understand. FIXME */ return;
}
/* Port offset and count in the third dword, see section 7.2 */
temp = readl(addr + 2);
port_offset = XHCI_EXT_PORT_OFF(temp);
port_count = XHCI_EXT_PORT_COUNT(temp);
xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Ext Cap %p, port offset = %u, count = %u, revision = 0x%x",
addr, port_offset, port_count, major_revision); /* Port count includes the current port offset */ if (port_offset == 0 || (port_offset + port_count - 1) > num_ports) /* WTF? "Valid values are ‘1’ to MaxPorts" */ return;
port_cap = &xhci->port_caps[xhci->num_port_caps++]; if (xhci->num_port_caps > max_caps) return;
port_cap->psi_count = XHCI_EXT_PORT_PSIC(temp);
if (port_cap->psi_count) {
port_cap->psi = kcalloc_node(port_cap->psi_count, sizeof(*port_cap->psi),
GFP_KERNEL, dev_to_node(dev)); if (!port_cap->psi)
port_cap->psi_count = 0;
port_cap->psi_uid_count++; for (i = 0; i < port_cap->psi_count; i++) {
port_cap->psi[i] = readl(addr + 4 + i);
/* count unique ID values, two consecutive entries can * have the same ID if link is assymetric
*/ if (i && (XHCI_EXT_PORT_PSIV(port_cap->psi[i]) !=
XHCI_EXT_PORT_PSIV(port_cap->psi[i - 1])))
port_cap->psi_uid_count++;
port_offset--; for (i = port_offset; i < (port_offset + port_count); i++) { struct xhci_port *hw_port = &xhci->hw_ports[i]; /* Duplicate entry. Ignore the port if the revisions differ. */ if (hw_port->rhub) {
xhci_warn(xhci, "Duplicate port entry, Ext Cap %p, port %u\n", addr, i);
xhci_warn(xhci, "Port was marked as USB %u, duplicated as USB %u\n",
hw_port->rhub->maj_rev, major_revision); /* Only adjust the roothub port counts if we haven't * found a similar duplicate.
*/ if (hw_port->rhub != rhub &&
hw_port->hcd_portnum != DUPLICATE_ENTRY) {
hw_port->rhub->num_ports--;
hw_port->hcd_portnum = DUPLICATE_ENTRY;
} continue;
}
hw_port->rhub = rhub;
hw_port->port_cap = port_cap;
rhub->num_ports++;
} /* FIXME: Should we disable ports not in the Extended Capabilities? */
}
if (!rhub->num_ports) return;
rhub->ports = kcalloc_node(rhub->num_ports, sizeof(*rhub->ports),
flags, dev_to_node(dev)); if (!rhub->ports) return;
for (i = 0; i < HCS_MAX_PORTS(xhci->hcs_params1); i++) { if (xhci->hw_ports[i].rhub != rhub ||
xhci->hw_ports[i].hcd_portnum == DUPLICATE_ENTRY) continue;
xhci->hw_ports[i].hcd_portnum = port_index;
rhub->ports[port_index] = &xhci->hw_ports[i];
port_index++; if (port_index == rhub->num_ports) break;
}
}
/* * Scan the Extended Capabilities for the "Supported Protocol Capabilities" that * specify what speeds each port is supposed to be. We can't count on the port * speed bits in the PORTSC register being correct until a device is connected, * but we need to set up the two fake roothubs with the correct number of USB * 3.0 and USB 2.0 ports at host controller initialization time.
*/ staticint xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags)
{ void __iomem *base;
u32 offset; unsignedint num_ports; int i, j; int cap_count = 0;
u32 cap_start; struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
xhci->rh_bw = kcalloc_node(num_ports, sizeof(*xhci->rh_bw), flags,
dev_to_node(dev)); if (!xhci->rh_bw) return -ENOMEM; for (i = 0; i < num_ports; i++) { struct xhci_interval_bw_table *bw_table;
INIT_LIST_HEAD(&xhci->rh_bw[i].tts);
bw_table = &xhci->rh_bw[i].bw_table; for (j = 0; j < XHCI_MAX_INTERVAL; j++)
INIT_LIST_HEAD(&bw_table->interval_bw[j].endpoints);
}
base = &xhci->cap_regs->hc_capbase;
cap_start = xhci_find_next_ext_cap(base, 0, XHCI_EXT_CAPS_PROTOCOL); if (!cap_start) {
xhci_err(xhci, "No Extended Capability registers, unable to set up roothub\n"); return -ENODEV;
}
offset = cap_start; /* count extended protocol capability entries for later caching */ while (offset) {
cap_count++;
offset = xhci_find_next_ext_cap(base, offset,
XHCI_EXT_CAPS_PROTOCOL);
}
xhci->port_caps = kcalloc_node(cap_count, sizeof(*xhci->port_caps),
flags, dev_to_node(dev)); if (!xhci->port_caps) return -ENOMEM;
offset = cap_start;
while (offset) {
xhci_add_in_port(xhci, num_ports, base + offset, cap_count); if (xhci->usb2_rhub.num_ports + xhci->usb3_rhub.num_ports ==
num_ports) break;
offset = xhci_find_next_ext_cap(base, offset,
XHCI_EXT_CAPS_PROTOCOL);
} if (xhci->usb2_rhub.num_ports == 0 && xhci->usb3_rhub.num_ports == 0) {
xhci_warn(xhci, "No ports on the roothubs?\n"); return -ENODEV;
}
xhci_dbg_trace(xhci, trace_xhci_dbg_init,
--> --------------------
--> maximum size reached
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