| /* |
| * xHCI host controller driver |
| * |
| * Copyright (C) 2008 Intel Corp. |
| * |
| * Author: Sarah Sharp |
| * Some code borrowed from the Linux EHCI driver. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software Foundation, |
| * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| /* |
| * Ring initialization rules: |
| * 1. Each segment is initialized to zero, except for link TRBs. |
| * 2. Ring cycle state = 0. This represents Producer Cycle State (PCS) or |
| * Consumer Cycle State (CCS), depending on ring function. |
| * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment. |
| * |
| * Ring behavior rules: |
| * 1. A ring is empty if enqueue == dequeue. This means there will always be at |
| * least one free TRB in the ring. This is useful if you want to turn that |
| * into a link TRB and expand the ring. |
| * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a |
| * link TRB, then load the pointer with the address in the link TRB. If the |
| * link TRB had its toggle bit set, you may need to update the ring cycle |
| * state (see cycle bit rules). You may have to do this multiple times |
| * until you reach a non-link TRB. |
| * 3. A ring is full if enqueue++ (for the definition of increment above) |
| * equals the dequeue pointer. |
| * |
| * Cycle bit rules: |
| * 1. When a consumer increments a dequeue pointer and encounters a toggle bit |
| * in a link TRB, it must toggle the ring cycle state. |
| * 2. When a producer increments an enqueue pointer and encounters a toggle bit |
| * in a link TRB, it must toggle the ring cycle state. |
| * |
| * Producer rules: |
| * 1. Check if ring is full before you enqueue. |
| * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing. |
| * Update enqueue pointer between each write (which may update the ring |
| * cycle state). |
| * 3. Notify consumer. If SW is producer, it rings the doorbell for command |
| * and endpoint rings. If HC is the producer for the event ring, |
| * and it generates an interrupt according to interrupt modulation rules. |
| * |
| * Consumer rules: |
| * 1. Check if TRB belongs to you. If the cycle bit == your ring cycle state, |
| * the TRB is owned by the consumer. |
| * 2. Update dequeue pointer (which may update the ring cycle state) and |
| * continue processing TRBs until you reach a TRB which is not owned by you. |
| * 3. Notify the producer. SW is the consumer for the event ring, and it |
| * updates event ring dequeue pointer. HC is the consumer for the command and |
| * endpoint rings; it generates events on the event ring for these. |
| */ |
| |
| #include <linux/scatterlist.h> |
| #include <linux/slab.h> |
| #include "xhci.h" |
| #include "xhci-trace.h" |
| |
| /* |
| * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA |
| * address of the TRB. |
| */ |
| dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, |
| union xhci_trb *trb) |
| { |
| unsigned long segment_offset; |
| |
| if (!seg || !trb || trb < seg->trbs) |
| return 0; |
| /* offset in TRBs */ |
| segment_offset = trb - seg->trbs; |
| if (segment_offset > TRBS_PER_SEGMENT) |
| return 0; |
| return seg->dma + (segment_offset * sizeof(*trb)); |
| } |
| |
| /* Does this link TRB point to the first segment in a ring, |
| * or was the previous TRB the last TRB on the last segment in the ERST? |
| */ |
| static bool last_trb_on_last_seg(struct xhci_hcd *xhci, struct xhci_ring *ring, |
| struct xhci_segment *seg, union xhci_trb *trb) |
| { |
| if (ring == xhci->event_ring) |
| return (trb == &seg->trbs[TRBS_PER_SEGMENT]) && |
| (seg->next == xhci->event_ring->first_seg); |
| else |
| return le32_to_cpu(trb->link.control) & LINK_TOGGLE; |
| } |
| |
| /* Is this TRB a link TRB or was the last TRB the last TRB in this event ring |
| * segment? I.e. would the updated event TRB pointer step off the end of the |
| * event seg? |
| */ |
| static int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, |
| struct xhci_segment *seg, union xhci_trb *trb) |
| { |
| if (ring == xhci->event_ring) |
| return trb == &seg->trbs[TRBS_PER_SEGMENT]; |
| else |
| return TRB_TYPE_LINK_LE32(trb->link.control); |
| } |
| |
| static int enqueue_is_link_trb(struct xhci_ring *ring) |
| { |
| struct xhci_link_trb *link = &ring->enqueue->link; |
| return TRB_TYPE_LINK_LE32(link->control); |
| } |
| |
| /* Updates trb to point to the next TRB in the ring, and updates seg if the next |
| * TRB is in a new segment. This does not skip over link TRBs, and it does not |
| * effect the ring dequeue or enqueue pointers. |
| */ |
| static void next_trb(struct xhci_hcd *xhci, |
| struct xhci_ring *ring, |
| struct xhci_segment **seg, |
| union xhci_trb **trb) |
| { |
| if (last_trb(xhci, ring, *seg, *trb)) { |
| *seg = (*seg)->next; |
| *trb = ((*seg)->trbs); |
| } else { |
| (*trb)++; |
| } |
| } |
| |
| /* |
| * See Cycle bit rules. SW is the consumer for the event ring only. |
| * Don't make a ring full of link TRBs. That would be dumb and this would loop. |
| */ |
| static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring) |
| { |
| ring->deq_updates++; |
| |
| /* |
| * If this is not event ring, and the dequeue pointer |
| * is not on a link TRB, there is one more usable TRB |
| */ |
| if (ring->type != TYPE_EVENT && |
| !last_trb(xhci, ring, ring->deq_seg, ring->dequeue)) |
| ring->num_trbs_free++; |
| |
| do { |
| /* |
| * Update the dequeue pointer further if that was a link TRB or |
| * we're at the end of an event ring segment (which doesn't have |
| * link TRBS) |
| */ |
| if (last_trb(xhci, ring, ring->deq_seg, ring->dequeue)) { |
| if (ring->type == TYPE_EVENT && |
| last_trb_on_last_seg(xhci, ring, |
| ring->deq_seg, ring->dequeue)) { |
| ring->cycle_state ^= 1; |
| } |
| ring->deq_seg = ring->deq_seg->next; |
| ring->dequeue = ring->deq_seg->trbs; |
| } else { |
| ring->dequeue++; |
| } |
| } while (last_trb(xhci, ring, ring->deq_seg, ring->dequeue)); |
| } |
| |
| /* |
| * See Cycle bit rules. SW is the consumer for the event ring only. |
| * Don't make a ring full of link TRBs. That would be dumb and this would loop. |
| * |
| * If we've just enqueued a TRB that is in the middle of a TD (meaning the |
| * chain bit is set), then set the chain bit in all the following link TRBs. |
| * If we've enqueued the last TRB in a TD, make sure the following link TRBs |
| * have their chain bit cleared (so that each Link TRB is a separate TD). |
| * |
| * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit |
| * set, but other sections talk about dealing with the chain bit set. This was |
| * fixed in the 0.96 specification errata, but we have to assume that all 0.95 |
| * xHCI hardware can't handle the chain bit being cleared on a link TRB. |
| * |
| * @more_trbs_coming: Will you enqueue more TRBs before calling |
| * prepare_transfer()? |
| */ |
| static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, |
| bool more_trbs_coming) |
| { |
| u32 chain; |
| union xhci_trb *next; |
| |
| chain = le32_to_cpu(ring->enqueue->generic.field[3]) & TRB_CHAIN; |
| /* If this is not event ring, there is one less usable TRB */ |
| if (ring->type != TYPE_EVENT && |
| !last_trb(xhci, ring, ring->enq_seg, ring->enqueue)) |
| ring->num_trbs_free--; |
| next = ++(ring->enqueue); |
| |
| ring->enq_updates++; |
| /* Update the dequeue pointer further if that was a link TRB or we're at |
| * the end of an event ring segment (which doesn't have link TRBS) |
| */ |
| while (last_trb(xhci, ring, ring->enq_seg, next)) { |
| if (ring->type != TYPE_EVENT) { |
| /* |
| * If the caller doesn't plan on enqueueing more |
| * TDs before ringing the doorbell, then we |
| * don't want to give the link TRB to the |
| * hardware just yet. We'll give the link TRB |
| * back in prepare_ring() just before we enqueue |
| * the TD at the top of the ring. |
| */ |
| if (!chain && !more_trbs_coming) |
| break; |
| |
| /* If we're not dealing with 0.95 hardware or |
| * isoc rings on AMD 0.96 host, |
| * carry over the chain bit of the previous TRB |
| * (which may mean the chain bit is cleared). |
| */ |
| if (!(ring->type == TYPE_ISOC && |
| (xhci->quirks & XHCI_AMD_0x96_HOST)) |
| && !xhci_link_trb_quirk(xhci)) { |
| next->link.control &= |
| cpu_to_le32(~TRB_CHAIN); |
| next->link.control |= |
| cpu_to_le32(chain); |
| } |
| /* Give this link TRB to the hardware */ |
| wmb(); |
| next->link.control ^= cpu_to_le32(TRB_CYCLE); |
| |
| /* Toggle the cycle bit after the last ring segment. */ |
| if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) { |
| ring->cycle_state = (ring->cycle_state ? 0 : 1); |
| } |
| } |
| ring->enq_seg = ring->enq_seg->next; |
| ring->enqueue = ring->enq_seg->trbs; |
| next = ring->enqueue; |
| } |
| } |
| |
| /* |
| * Check to see if there's room to enqueue num_trbs on the ring and make sure |
| * enqueue pointer will not advance into dequeue segment. See rules above. |
| */ |
| static inline int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring, |
| unsigned int num_trbs) |
| { |
| int num_trbs_in_deq_seg; |
| |
| if (ring->num_trbs_free < num_trbs) |
| return 0; |
| |
| if (ring->type != TYPE_COMMAND && ring->type != TYPE_EVENT) { |
| num_trbs_in_deq_seg = ring->dequeue - ring->deq_seg->trbs; |
| if (ring->num_trbs_free < num_trbs + num_trbs_in_deq_seg) |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /* Ring the host controller doorbell after placing a command on the ring */ |
| void xhci_ring_cmd_db(struct xhci_hcd *xhci) |
| { |
| if (!(xhci->cmd_ring_state & CMD_RING_STATE_RUNNING)) |
| return; |
| |
| xhci_dbg(xhci, "// Ding dong!\n"); |
| writel(DB_VALUE_HOST, &xhci->dba->doorbell[0]); |
| /* Flush PCI posted writes */ |
| readl(&xhci->dba->doorbell[0]); |
| } |
| |
| static int xhci_abort_cmd_ring(struct xhci_hcd *xhci) |
| { |
| u64 temp_64; |
| int ret; |
| |
| xhci_dbg(xhci, "Abort command ring\n"); |
| |
| temp_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); |
| xhci->cmd_ring_state = CMD_RING_STATE_ABORTED; |
| xhci_write_64(xhci, temp_64 | CMD_RING_ABORT, |
| &xhci->op_regs->cmd_ring); |
| |
| /* Section 4.6.1.2 of xHCI 1.0 spec says software should |
| * time the completion od all xHCI commands, including |
| * the Command Abort operation. If software doesn't see |
| * CRR negated in a timely manner (e.g. longer than 5 |
| * seconds), then it should assume that the there are |
| * larger problems with the xHC and assert HCRST. |
| */ |
| ret = xhci_handshake(&xhci->op_regs->cmd_ring, |
| CMD_RING_RUNNING, 0, 5 * 1000 * 1000); |
| if (ret < 0) { |
| xhci_err(xhci, "Stopped the command ring failed, " |
| "maybe the host is dead\n"); |
| xhci->xhc_state |= XHCI_STATE_DYING; |
| xhci_quiesce(xhci); |
| xhci_halt(xhci); |
| return -ESHUTDOWN; |
| } |
| |
| return 0; |
| } |
| |
| void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, |
| unsigned int slot_id, |
| unsigned int ep_index, |
| unsigned int stream_id) |
| { |
| __le32 __iomem *db_addr = &xhci->dba->doorbell[slot_id]; |
| struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index]; |
| unsigned int ep_state = ep->ep_state; |
| |
| /* Don't ring the doorbell for this endpoint if there are pending |
| * cancellations because we don't want to interrupt processing. |
| * We don't want to restart any stream rings if there's a set dequeue |
| * pointer command pending because the device can choose to start any |
| * stream once the endpoint is on the HW schedule. |
| */ |
| if ((ep_state & EP_HALT_PENDING) || (ep_state & SET_DEQ_PENDING) || |
| (ep_state & EP_HALTED)) |
| return; |
| writel(DB_VALUE(ep_index, stream_id), db_addr); |
| /* The CPU has better things to do at this point than wait for a |
| * write-posting flush. It'll get there soon enough. |
| */ |
| } |
| |
| /* Ring the doorbell for any rings with pending URBs */ |
| static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci, |
| unsigned int slot_id, |
| unsigned int ep_index) |
| { |
| unsigned int stream_id; |
| struct xhci_virt_ep *ep; |
| |
| ep = &xhci->devs[slot_id]->eps[ep_index]; |
| |
| /* A ring has pending URBs if its TD list is not empty */ |
| if (!(ep->ep_state & EP_HAS_STREAMS)) { |
| if (ep->ring && !(list_empty(&ep->ring->td_list))) |
| xhci_ring_ep_doorbell(xhci, slot_id, ep_index, 0); |
| return; |
| } |
| |
| for (stream_id = 1; stream_id < ep->stream_info->num_streams; |
| stream_id++) { |
| struct xhci_stream_info *stream_info = ep->stream_info; |
| if (!list_empty(&stream_info->stream_rings[stream_id]->td_list)) |
| xhci_ring_ep_doorbell(xhci, slot_id, ep_index, |
| stream_id); |
| } |
| } |
| |
| static struct xhci_ring *xhci_triad_to_transfer_ring(struct xhci_hcd *xhci, |
| unsigned int slot_id, unsigned int ep_index, |
| unsigned int stream_id) |
| { |
| struct xhci_virt_ep *ep; |
| |
| ep = &xhci->devs[slot_id]->eps[ep_index]; |
| /* Common case: no streams */ |
| if (!(ep->ep_state & EP_HAS_STREAMS)) |
| return ep->ring; |
| |
| if (stream_id == 0) { |
| xhci_warn(xhci, |
| "WARN: Slot ID %u, ep index %u has streams, " |
| "but URB has no stream ID.\n", |
| slot_id, ep_index); |
| return NULL; |
| } |
| |
| if (stream_id < ep->stream_info->num_streams) |
| return ep->stream_info->stream_rings[stream_id]; |
| |
| xhci_warn(xhci, |
| "WARN: Slot ID %u, ep index %u has " |
| "stream IDs 1 to %u allocated, " |
| "but stream ID %u is requested.\n", |
| slot_id, ep_index, |
| ep->stream_info->num_streams - 1, |
| stream_id); |
| return NULL; |
| } |
| |
| /* Get the right ring for the given URB. |
| * If the endpoint supports streams, boundary check the URB's stream ID. |
| * If the endpoint doesn't support streams, return the singular endpoint ring. |
| */ |
| static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci, |
| struct urb *urb) |
| { |
| return xhci_triad_to_transfer_ring(xhci, urb->dev->slot_id, |
| xhci_get_endpoint_index(&urb->ep->desc), urb->stream_id); |
| } |
| |
| /* |
| * Move the xHC's endpoint ring dequeue pointer past cur_td. |
| * Record the new state of the xHC's endpoint ring dequeue segment, |
| * dequeue pointer, and new consumer cycle state in state. |
| * Update our internal representation of the ring's dequeue pointer. |
| * |
| * We do this in three jumps: |
| * - First we update our new ring state to be the same as when the xHC stopped. |
| * - Then we traverse the ring to find the segment that contains |
| * the last TRB in the TD. We toggle the xHC's new cycle state when we pass |
| * any link TRBs with the toggle cycle bit set. |
| * - Finally we move the dequeue state one TRB further, toggling the cycle bit |
| * if we've moved it past a link TRB with the toggle cycle bit set. |
| * |
| * Some of the uses of xhci_generic_trb are grotty, but if they're done |
| * with correct __le32 accesses they should work fine. Only users of this are |
| * in here. |
| */ |
| void xhci_find_new_dequeue_state(struct xhci_hcd *xhci, |
| unsigned int slot_id, unsigned int ep_index, |
| unsigned int stream_id, struct xhci_td *cur_td, |
| struct xhci_dequeue_state *state) |
| { |
| struct xhci_virt_device *dev = xhci->devs[slot_id]; |
| struct xhci_virt_ep *ep = &dev->eps[ep_index]; |
| struct xhci_ring *ep_ring; |
| struct xhci_segment *new_seg; |
| union xhci_trb *new_deq; |
| dma_addr_t addr; |
| u64 hw_dequeue; |
| bool cycle_found = false; |
| bool td_last_trb_found = false; |
| |
| ep_ring = xhci_triad_to_transfer_ring(xhci, slot_id, |
| ep_index, stream_id); |
| if (!ep_ring) { |
| xhci_warn(xhci, "WARN can't find new dequeue state " |
| "for invalid stream ID %u.\n", |
| stream_id); |
| return; |
| } |
| |
| /* Dig out the cycle state saved by the xHC during the stop ep cmd */ |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Finding endpoint context"); |
| /* 4.6.9 the css flag is written to the stream context for streams */ |
| if (ep->ep_state & EP_HAS_STREAMS) { |
| struct xhci_stream_ctx *ctx = |
| &ep->stream_info->stream_ctx_array[stream_id]; |
| hw_dequeue = le64_to_cpu(ctx->stream_ring); |
| } else { |
| struct xhci_ep_ctx *ep_ctx |
| = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index); |
| hw_dequeue = le64_to_cpu(ep_ctx->deq); |
| } |
| |
| new_seg = ep_ring->deq_seg; |
| new_deq = ep_ring->dequeue; |
| state->new_cycle_state = hw_dequeue & 0x1; |
| |
| /* |
| * We want to find the pointer, segment and cycle state of the new trb |
| * (the one after current TD's last_trb). We know the cycle state at |
| * hw_dequeue, so walk the ring until both hw_dequeue and last_trb are |
| * found. |
| */ |
| do { |
| if (!cycle_found && xhci_trb_virt_to_dma(new_seg, new_deq) |
| == (dma_addr_t)(hw_dequeue & ~0xf)) { |
| cycle_found = true; |
| if (td_last_trb_found) |
| break; |
| } |
| if (new_deq == cur_td->last_trb) |
| td_last_trb_found = true; |
| |
| if (cycle_found && |
| TRB_TYPE_LINK_LE32(new_deq->generic.field[3]) && |
| new_deq->generic.field[3] & cpu_to_le32(LINK_TOGGLE)) |
| state->new_cycle_state ^= 0x1; |
| |
| next_trb(xhci, ep_ring, &new_seg, &new_deq); |
| |
| /* Search wrapped around, bail out */ |
| if (new_deq == ep->ring->dequeue) { |
| xhci_err(xhci, "Error: Failed finding new dequeue state\n"); |
| state->new_deq_seg = NULL; |
| state->new_deq_ptr = NULL; |
| return; |
| } |
| |
| } while (!cycle_found || !td_last_trb_found); |
| |
| state->new_deq_seg = new_seg; |
| state->new_deq_ptr = new_deq; |
| |
| /* Don't update the ring cycle state for the producer (us). */ |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Cycle state = 0x%x", state->new_cycle_state); |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "New dequeue segment = %p (virtual)", |
| state->new_deq_seg); |
| addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "New dequeue pointer = 0x%llx (DMA)", |
| (unsigned long long) addr); |
| } |
| |
| /* flip_cycle means flip the cycle bit of all but the first and last TRB. |
| * (The last TRB actually points to the ring enqueue pointer, which is not part |
| * of this TD.) This is used to remove partially enqueued isoc TDs from a ring. |
| */ |
| static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, |
| struct xhci_td *cur_td, bool flip_cycle) |
| { |
| struct xhci_segment *cur_seg; |
| union xhci_trb *cur_trb; |
| |
| for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb; |
| true; |
| next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { |
| if (TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) { |
| /* Unchain any chained Link TRBs, but |
| * leave the pointers intact. |
| */ |
| cur_trb->generic.field[3] &= cpu_to_le32(~TRB_CHAIN); |
| /* Flip the cycle bit (link TRBs can't be the first |
| * or last TRB). |
| */ |
| if (flip_cycle) |
| cur_trb->generic.field[3] ^= |
| cpu_to_le32(TRB_CYCLE); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Cancel (unchain) link TRB"); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Address = %p (0x%llx dma); " |
| "in seg %p (0x%llx dma)", |
| cur_trb, |
| (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb), |
| cur_seg, |
| (unsigned long long)cur_seg->dma); |
| } else { |
| cur_trb->generic.field[0] = 0; |
| cur_trb->generic.field[1] = 0; |
| cur_trb->generic.field[2] = 0; |
| /* Preserve only the cycle bit of this TRB */ |
| cur_trb->generic.field[3] &= cpu_to_le32(TRB_CYCLE); |
| /* Flip the cycle bit except on the first or last TRB */ |
| if (flip_cycle && cur_trb != cur_td->first_trb && |
| cur_trb != cur_td->last_trb) |
| cur_trb->generic.field[3] ^= |
| cpu_to_le32(TRB_CYCLE); |
| cur_trb->generic.field[3] |= cpu_to_le32( |
| TRB_TYPE(TRB_TR_NOOP)); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "TRB to noop at offset 0x%llx", |
| (unsigned long long) |
| xhci_trb_virt_to_dma(cur_seg, cur_trb)); |
| } |
| if (cur_trb == cur_td->last_trb) |
| break; |
| } |
| } |
| |
| static void xhci_stop_watchdog_timer_in_irq(struct xhci_hcd *xhci, |
| struct xhci_virt_ep *ep) |
| { |
| ep->ep_state &= ~EP_HALT_PENDING; |
| /* Can't del_timer_sync in interrupt, so we attempt to cancel. If the |
| * timer is running on another CPU, we don't decrement stop_cmds_pending |
| * (since we didn't successfully stop the watchdog timer). |
| */ |
| if (del_timer(&ep->stop_cmd_timer)) |
| ep->stop_cmds_pending--; |
| } |
| |
| /* Must be called with xhci->lock held in interrupt context */ |
| static void xhci_giveback_urb_in_irq(struct xhci_hcd *xhci, |
| struct xhci_td *cur_td, int status) |
| { |
| struct usb_hcd *hcd; |
| struct urb *urb; |
| struct urb_priv *urb_priv; |
| |
| urb = cur_td->urb; |
| urb_priv = urb->hcpriv; |
| urb_priv->td_cnt++; |
| hcd = bus_to_hcd(urb->dev->bus); |
| |
| /* Only giveback urb when this is the last td in urb */ |
| if (urb_priv->td_cnt == urb_priv->length) { |
| if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { |
| xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--; |
| if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) { |
| if (xhci->quirks & XHCI_AMD_PLL_FIX) |
| usb_amd_quirk_pll_enable(); |
| } |
| } |
| usb_hcd_unlink_urb_from_ep(hcd, urb); |
| |
| spin_unlock(&xhci->lock); |
| usb_hcd_giveback_urb(hcd, urb, status); |
| xhci_urb_free_priv(urb_priv); |
| spin_lock(&xhci->lock); |
| } |
| } |
| |
| /* |
| * When we get a command completion for a Stop Endpoint Command, we need to |
| * unlink any cancelled TDs from the ring. There are two ways to do that: |
| * |
| * 1. If the HW was in the middle of processing the TD that needs to be |
| * cancelled, then we must move the ring's dequeue pointer past the last TRB |
| * in the TD with a Set Dequeue Pointer Command. |
| * 2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain |
| * bit cleared) so that the HW will skip over them. |
| */ |
| static void xhci_handle_cmd_stop_ep(struct xhci_hcd *xhci, int slot_id, |
| union xhci_trb *trb, struct xhci_event_cmd *event) |
| { |
| unsigned int ep_index; |
| struct xhci_ring *ep_ring; |
| struct xhci_virt_ep *ep; |
| struct list_head *entry; |
| struct xhci_td *cur_td = NULL; |
| struct xhci_td *last_unlinked_td; |
| |
| struct xhci_dequeue_state deq_state; |
| |
| if (unlikely(TRB_TO_SUSPEND_PORT(le32_to_cpu(trb->generic.field[3])))) { |
| if (!xhci->devs[slot_id]) |
| xhci_warn(xhci, "Stop endpoint command " |
| "completion for disabled slot %u\n", |
| slot_id); |
| return; |
| } |
| |
| memset(&deq_state, 0, sizeof(deq_state)); |
| ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3])); |
| ep = &xhci->devs[slot_id]->eps[ep_index]; |
| |
| if (list_empty(&ep->cancelled_td_list)) { |
| xhci_stop_watchdog_timer_in_irq(xhci, ep); |
| ep->stopped_td = NULL; |
| ring_doorbell_for_active_rings(xhci, slot_id, ep_index); |
| return; |
| } |
| |
| /* Fix up the ep ring first, so HW stops executing cancelled TDs. |
| * We have the xHCI lock, so nothing can modify this list until we drop |
| * it. We're also in the event handler, so we can't get re-interrupted |
| * if another Stop Endpoint command completes |
| */ |
| list_for_each(entry, &ep->cancelled_td_list) { |
| cur_td = list_entry(entry, struct xhci_td, cancelled_td_list); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Removing canceled TD starting at 0x%llx (dma).", |
| (unsigned long long)xhci_trb_virt_to_dma( |
| cur_td->start_seg, cur_td->first_trb)); |
| ep_ring = xhci_urb_to_transfer_ring(xhci, cur_td->urb); |
| if (!ep_ring) { |
| /* This shouldn't happen unless a driver is mucking |
| * with the stream ID after submission. This will |
| * leave the TD on the hardware ring, and the hardware |
| * will try to execute it, and may access a buffer |
| * that has already been freed. In the best case, the |
| * hardware will execute it, and the event handler will |
| * ignore the completion event for that TD, since it was |
| * removed from the td_list for that endpoint. In |
| * short, don't muck with the stream ID after |
| * submission. |
| */ |
| xhci_warn(xhci, "WARN Cancelled URB %p " |
| "has invalid stream ID %u.\n", |
| cur_td->urb, |
| cur_td->urb->stream_id); |
| goto remove_finished_td; |
| } |
| /* |
| * If we stopped on the TD we need to cancel, then we have to |
| * move the xHC endpoint ring dequeue pointer past this TD. |
| */ |
| if (cur_td == ep->stopped_td) |
| xhci_find_new_dequeue_state(xhci, slot_id, ep_index, |
| cur_td->urb->stream_id, |
| cur_td, &deq_state); |
| else |
| td_to_noop(xhci, ep_ring, cur_td, false); |
| remove_finished_td: |
| /* |
| * The event handler won't see a completion for this TD anymore, |
| * so remove it from the endpoint ring's TD list. Keep it in |
| * the cancelled TD list for URB completion later. |
| */ |
| list_del_init(&cur_td->td_list); |
| } |
| last_unlinked_td = cur_td; |
| xhci_stop_watchdog_timer_in_irq(xhci, ep); |
| |
| /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */ |
| if (deq_state.new_deq_ptr && deq_state.new_deq_seg) { |
| xhci_queue_new_dequeue_state(xhci, slot_id, ep_index, |
| ep->stopped_td->urb->stream_id, &deq_state); |
| xhci_ring_cmd_db(xhci); |
| } else { |
| /* Otherwise ring the doorbell(s) to restart queued transfers */ |
| ring_doorbell_for_active_rings(xhci, slot_id, ep_index); |
| } |
| |
| ep->stopped_td = NULL; |
| |
| /* |
| * Drop the lock and complete the URBs in the cancelled TD list. |
| * New TDs to be cancelled might be added to the end of the list before |
| * we can complete all the URBs for the TDs we already unlinked. |
| * So stop when we've completed the URB for the last TD we unlinked. |
| */ |
| do { |
| cur_td = list_entry(ep->cancelled_td_list.next, |
| struct xhci_td, cancelled_td_list); |
| list_del_init(&cur_td->cancelled_td_list); |
| |
| /* Clean up the cancelled URB */ |
| /* Doesn't matter what we pass for status, since the core will |
| * just overwrite it (because the URB has been unlinked). |
| */ |
| xhci_giveback_urb_in_irq(xhci, cur_td, 0); |
| |
| /* Stop processing the cancelled list if the watchdog timer is |
| * running. |
| */ |
| if (xhci->xhc_state & XHCI_STATE_DYING) |
| return; |
| } while (cur_td != last_unlinked_td); |
| |
| /* Return to the event handler with xhci->lock re-acquired */ |
| } |
| |
| static void xhci_kill_ring_urbs(struct xhci_hcd *xhci, struct xhci_ring *ring) |
| { |
| struct xhci_td *cur_td; |
| |
| while (!list_empty(&ring->td_list)) { |
| cur_td = list_first_entry(&ring->td_list, |
| struct xhci_td, td_list); |
| list_del_init(&cur_td->td_list); |
| if (!list_empty(&cur_td->cancelled_td_list)) |
| list_del_init(&cur_td->cancelled_td_list); |
| xhci_giveback_urb_in_irq(xhci, cur_td, -ESHUTDOWN); |
| } |
| } |
| |
| static void xhci_kill_endpoint_urbs(struct xhci_hcd *xhci, |
| int slot_id, int ep_index) |
| { |
| struct xhci_td *cur_td; |
| struct xhci_virt_ep *ep; |
| struct xhci_ring *ring; |
| |
| ep = &xhci->devs[slot_id]->eps[ep_index]; |
| if ((ep->ep_state & EP_HAS_STREAMS) || |
| (ep->ep_state & EP_GETTING_NO_STREAMS)) { |
| int stream_id; |
| |
| for (stream_id = 0; stream_id < ep->stream_info->num_streams; |
| stream_id++) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Killing URBs for slot ID %u, ep index %u, stream %u", |
| slot_id, ep_index, stream_id + 1); |
| xhci_kill_ring_urbs(xhci, |
| ep->stream_info->stream_rings[stream_id]); |
| } |
| } else { |
| ring = ep->ring; |
| if (!ring) |
| return; |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Killing URBs for slot ID %u, ep index %u", |
| slot_id, ep_index); |
| xhci_kill_ring_urbs(xhci, ring); |
| } |
| while (!list_empty(&ep->cancelled_td_list)) { |
| cur_td = list_first_entry(&ep->cancelled_td_list, |
| struct xhci_td, cancelled_td_list); |
| list_del_init(&cur_td->cancelled_td_list); |
| xhci_giveback_urb_in_irq(xhci, cur_td, -ESHUTDOWN); |
| } |
| } |
| |
| /* Watchdog timer function for when a stop endpoint command fails to complete. |
| * In this case, we assume the host controller is broken or dying or dead. The |
| * host may still be completing some other events, so we have to be careful to |
| * let the event ring handler and the URB dequeueing/enqueueing functions know |
| * through xhci->state. |
| * |
| * The timer may also fire if the host takes a very long time to respond to the |
| * command, and the stop endpoint command completion handler cannot delete the |
| * timer before the timer function is called. Another endpoint cancellation may |
| * sneak in before the timer function can grab the lock, and that may queue |
| * another stop endpoint command and add the timer back. So we cannot use a |
| * simple flag to say whether there is a pending stop endpoint command for a |
| * particular endpoint. |
| * |
| * Instead we use a combination of that flag and a counter for the number of |
| * pending stop endpoint commands. If the timer is the tail end of the last |
| * stop endpoint command, and the endpoint's command is still pending, we assume |
| * the host is dying. |
| */ |
| void xhci_stop_endpoint_command_watchdog(unsigned long arg) |
| { |
| struct xhci_hcd *xhci; |
| struct xhci_virt_ep *ep; |
| int ret, i, j; |
| unsigned long flags; |
| |
| ep = (struct xhci_virt_ep *) arg; |
| xhci = ep->xhci; |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| |
| ep->stop_cmds_pending--; |
| if (xhci->xhc_state & XHCI_STATE_DYING) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Stop EP timer ran, but another timer marked " |
| "xHCI as DYING, exiting."); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return; |
| } |
| if (!(ep->stop_cmds_pending == 0 && (ep->ep_state & EP_HALT_PENDING))) { |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Stop EP timer ran, but no command pending, " |
| "exiting."); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return; |
| } |
| |
| xhci_warn(xhci, "xHCI host not responding to stop endpoint command.\n"); |
| xhci_warn(xhci, "Assuming host is dying, halting host.\n"); |
| /* Oops, HC is dead or dying or at least not responding to the stop |
| * endpoint command. |
| */ |
| xhci->xhc_state |= XHCI_STATE_DYING; |
| /* Disable interrupts from the host controller and start halting it */ |
| xhci_quiesce(xhci); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| |
| ret = xhci_halt(xhci); |
| |
| spin_lock_irqsave(&xhci->lock, flags); |
| if (ret < 0) { |
| /* This is bad; the host is not responding to commands and it's |
| * not allowing itself to be halted. At least interrupts are |
| * disabled. If we call usb_hc_died(), it will attempt to |
| * disconnect all device drivers under this host. Those |
| * disconnect() methods will wait for all URBs to be unlinked, |
| * so we must complete them. |
| */ |
| xhci_warn(xhci, "Non-responsive xHCI host is not halting.\n"); |
| xhci_warn(xhci, "Completing active URBs anyway.\n"); |
| /* We could turn all TDs on the rings to no-ops. This won't |
| * help if the host has cached part of the ring, and is slow if |
| * we want to preserve the cycle bit. Skip it and hope the host |
| * doesn't touch the memory. |
| */ |
| } |
| for (i = 0; i < MAX_HC_SLOTS; i++) { |
| if (!xhci->devs[i]) |
| continue; |
| for (j = 0; j < 31; j++) |
| xhci_kill_endpoint_urbs(xhci, i, j); |
| } |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Calling usb_hc_died()"); |
| usb_hc_died(xhci_to_hcd(xhci)->primary_hcd); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "xHCI host controller is dead."); |
| } |
| |
| |
| static void update_ring_for_set_deq_completion(struct xhci_hcd *xhci, |
| struct xhci_virt_device *dev, |
| struct xhci_ring *ep_ring, |
| unsigned int ep_index) |
| { |
| union xhci_trb *dequeue_temp; |
| int num_trbs_free_temp; |
| bool revert = false; |
| |
| num_trbs_free_temp = ep_ring->num_trbs_free; |
| dequeue_temp = ep_ring->dequeue; |
| |
| /* If we get two back-to-back stalls, and the first stalled transfer |
| * ends just before a link TRB, the dequeue pointer will be left on |
| * the link TRB by the code in the while loop. So we have to update |
| * the dequeue pointer one segment further, or we'll jump off |
| * the segment into la-la-land. |
| */ |
| if (last_trb(xhci, ep_ring, ep_ring->deq_seg, ep_ring->dequeue)) { |
| ep_ring->deq_seg = ep_ring->deq_seg->next; |
| ep_ring->dequeue = ep_ring->deq_seg->trbs; |
| } |
| |
| while (ep_ring->dequeue != dev->eps[ep_index].queued_deq_ptr) { |
| /* We have more usable TRBs */ |
| ep_ring->num_trbs_free++; |
| ep_ring->dequeue++; |
| if (last_trb(xhci, ep_ring, ep_ring->deq_seg, |
| ep_ring->dequeue)) { |
| if (ep_ring->dequeue == |
| dev->eps[ep_index].queued_deq_ptr) |
| break; |
| ep_ring->deq_seg = ep_ring->deq_seg->next; |
| ep_ring->dequeue = ep_ring->deq_seg->trbs; |
| } |
| if (ep_ring->dequeue == dequeue_temp) { |
| revert = true; |
| break; |
| } |
| } |
| |
| if (revert) { |
| xhci_dbg(xhci, "Unable to find new dequeue pointer\n"); |
| ep_ring->num_trbs_free = num_trbs_free_temp; |
| } |
| } |
| |
| /* |
| * When we get a completion for a Set Transfer Ring Dequeue Pointer command, |
| * we need to clear the set deq pending flag in the endpoint ring state, so that |
| * the TD queueing code can ring the doorbell again. We also need to ring the |
| * endpoint doorbell to restart the ring, but only if there aren't more |
| * cancellations pending. |
| */ |
| static void xhci_handle_cmd_set_deq(struct xhci_hcd *xhci, int slot_id, |
| union xhci_trb *trb, u32 cmd_comp_code) |
| { |
| unsigned int ep_index; |
| unsigned int stream_id; |
| struct xhci_ring *ep_ring; |
| struct xhci_virt_device *dev; |
| struct xhci_virt_ep *ep; |
| struct xhci_ep_ctx *ep_ctx; |
| struct xhci_slot_ctx *slot_ctx; |
| |
| ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3])); |
| stream_id = TRB_TO_STREAM_ID(le32_to_cpu(trb->generic.field[2])); |
| dev = xhci->devs[slot_id]; |
| ep = &dev->eps[ep_index]; |
| |
| ep_ring = xhci_stream_id_to_ring(dev, ep_index, stream_id); |
| if (!ep_ring) { |
| xhci_warn(xhci, "WARN Set TR deq ptr command for freed stream ID %u\n", |
| stream_id); |
| /* XXX: Harmless??? */ |
| goto cleanup; |
| } |
| |
| ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index); |
| slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx); |
| |
| if (cmd_comp_code != COMP_SUCCESS) { |
| unsigned int ep_state; |
| unsigned int slot_state; |
| |
| switch (cmd_comp_code) { |
| case COMP_TRB_ERR: |
| xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because of stream ID configuration\n"); |
| break; |
| case COMP_CTX_STATE: |
| xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.\n"); |
| ep_state = le32_to_cpu(ep_ctx->ep_info); |
| ep_state &= EP_STATE_MASK; |
| slot_state = le32_to_cpu(slot_ctx->dev_state); |
| slot_state = GET_SLOT_STATE(slot_state); |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Slot state = %u, EP state = %u", |
| slot_state, ep_state); |
| break; |
| case COMP_EBADSLT: |
| xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because slot %u was not enabled.\n", |
| slot_id); |
| break; |
| default: |
| xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown completion code of %u.\n", |
| cmd_comp_code); |
| break; |
| } |
| /* OK what do we do now? The endpoint state is hosed, and we |
| * should never get to this point if the synchronization between |
| * queueing, and endpoint state are correct. This might happen |
| * if the device gets disconnected after we've finished |
| * cancelling URBs, which might not be an error... |
| */ |
| } else { |
| u64 deq; |
| /* 4.6.10 deq ptr is written to the stream ctx for streams */ |
| if (ep->ep_state & EP_HAS_STREAMS) { |
| struct xhci_stream_ctx *ctx = |
| &ep->stream_info->stream_ctx_array[stream_id]; |
| deq = le64_to_cpu(ctx->stream_ring) & SCTX_DEQ_MASK; |
| } else { |
| deq = le64_to_cpu(ep_ctx->deq) & ~EP_CTX_CYCLE_MASK; |
| } |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Successful Set TR Deq Ptr cmd, deq = @%08llx", deq); |
| if (xhci_trb_virt_to_dma(ep->queued_deq_seg, |
| ep->queued_deq_ptr) == deq) { |
| /* Update the ring's dequeue segment and dequeue pointer |
| * to reflect the new position. |
| */ |
| update_ring_for_set_deq_completion(xhci, dev, |
| ep_ring, ep_index); |
| } else { |
| xhci_warn(xhci, "Mismatch between completed Set TR Deq Ptr command & xHCI internal state.\n"); |
| xhci_warn(xhci, "ep deq seg = %p, deq ptr = %p\n", |
| ep->queued_deq_seg, ep->queued_deq_ptr); |
| } |
| } |
| |
| cleanup: |
| dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING; |
| dev->eps[ep_index].queued_deq_seg = NULL; |
| dev->eps[ep_index].queued_deq_ptr = NULL; |
| /* Restart any rings with pending URBs */ |
| ring_doorbell_for_active_rings(xhci, slot_id, ep_index); |
| } |
| |
| static void xhci_handle_cmd_reset_ep(struct xhci_hcd *xhci, int slot_id, |
| union xhci_trb *trb, u32 cmd_comp_code) |
| { |
| unsigned int ep_index; |
| |
| ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3])); |
| /* This command will only fail if the endpoint wasn't halted, |
| * but we don't care. |
| */ |
| xhci_dbg_trace(xhci, trace_xhci_dbg_reset_ep, |
| "Ignoring reset ep completion code of %u", cmd_comp_code); |
| |
| /* HW with the reset endpoint quirk needs to have a configure endpoint |
| * command complete before the endpoint can be used. Queue that here |
| * because the HW can't handle two commands being queued in a row. |
| */ |
| if (xhci->quirks & XHCI_RESET_EP_QUIRK) { |
| struct xhci_command *command; |
| command = xhci_alloc_command(xhci, false, false, GFP_ATOMIC); |
| if (!command) { |
| xhci_warn(xhci, "WARN Cannot submit cfg ep: ENOMEM\n"); |
| return; |
| } |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Queueing configure endpoint command"); |
| xhci_queue_configure_endpoint(xhci, command, |
| xhci->devs[slot_id]->in_ctx->dma, slot_id, |
| false); |
| xhci_ring_cmd_db(xhci); |
| } else { |
| /* Clear our internal halted state */ |
| xhci->devs[slot_id]->eps[ep_index].ep_state &= ~EP_HALTED; |
| } |
| } |
| |
| static void xhci_handle_cmd_enable_slot(struct xhci_hcd *xhci, int slot_id, |
| u32 cmd_comp_code) |
| { |
| if (cmd_comp_code == COMP_SUCCESS) |
| xhci->slot_id = slot_id; |
| else |
| xhci->slot_id = 0; |
| } |
| |
| static void xhci_handle_cmd_disable_slot(struct xhci_hcd *xhci, int slot_id) |
| { |
| struct xhci_virt_device *virt_dev; |
| |
| virt_dev = xhci->devs[slot_id]; |
| if (!virt_dev) |
| return; |
| if (xhci->quirks & XHCI_EP_LIMIT_QUIRK) |
| /* Delete default control endpoint resources */ |
| xhci_free_device_endpoint_resources(xhci, virt_dev, true); |
| xhci_free_virt_device(xhci, slot_id); |
| } |
| |
| static void xhci_handle_cmd_config_ep(struct xhci_hcd *xhci, int slot_id, |
| struct xhci_event_cmd *event, u32 cmd_comp_code) |
| { |
| struct xhci_virt_device *virt_dev; |
| struct xhci_input_control_ctx *ctrl_ctx; |
| unsigned int ep_index; |
| unsigned int ep_state; |
| u32 add_flags, drop_flags; |
| |
| /* |
| * Configure endpoint commands can come from the USB core |
| * configuration or alt setting changes, or because the HW |
| * needed an extra configure endpoint command after a reset |
| * endpoint command or streams were being configured. |
| * If the command was for a halted endpoint, the xHCI driver |
| * is not waiting on the configure endpoint command. |
| */ |
| virt_dev = xhci->devs[slot_id]; |
| ctrl_ctx = xhci_get_input_control_ctx(virt_dev->in_ctx); |
| if (!ctrl_ctx) { |
| xhci_warn(xhci, "Could not get input context, bad type.\n"); |
| return; |
| } |
| |
| add_flags = le32_to_cpu(ctrl_ctx->add_flags); |
| drop_flags = le32_to_cpu(ctrl_ctx->drop_flags); |
| /* Input ctx add_flags are the endpoint index plus one */ |
| ep_index = xhci_last_valid_endpoint(add_flags) - 1; |
| |
| /* A usb_set_interface() call directly after clearing a halted |
| * condition may race on this quirky hardware. Not worth |
| * worrying about, since this is prototype hardware. Not sure |
| * if this will work for streams, but streams support was |
| * untested on this prototype. |
| */ |
| if (xhci->quirks & XHCI_RESET_EP_QUIRK && |
| ep_index != (unsigned int) -1 && |
| add_flags - SLOT_FLAG == drop_flags) { |
| ep_state = virt_dev->eps[ep_index].ep_state; |
| if (!(ep_state & EP_HALTED)) |
| return; |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "Completed config ep cmd - " |
| "last ep index = %d, state = %d", |
| ep_index, ep_state); |
| /* Clear internal halted state and restart ring(s) */ |
| virt_dev->eps[ep_index].ep_state &= ~EP_HALTED; |
| ring_doorbell_for_active_rings(xhci, slot_id, ep_index); |
| return; |
| } |
| return; |
| } |
| |
| static void xhci_handle_cmd_reset_dev(struct xhci_hcd *xhci, int slot_id, |
| struct xhci_event_cmd *event) |
| { |
| xhci_dbg(xhci, "Completed reset device command.\n"); |
| if (!xhci->devs[slot_id]) |
| xhci_warn(xhci, "Reset device command completion " |
| "for disabled slot %u\n", slot_id); |
| } |
| |
| static void xhci_handle_cmd_nec_get_fw(struct xhci_hcd *xhci, |
| struct xhci_event_cmd *event) |
| { |
| if (!(xhci->quirks & XHCI_NEC_HOST)) { |
| xhci->error_bitmask |= 1 << 6; |
| return; |
| } |
| xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, |
| "NEC firmware version %2x.%02x", |
| NEC_FW_MAJOR(le32_to_cpu(event->status)), |
| NEC_FW_MINOR(le32_to_cpu(event->status))); |
| } |
| |
| static void xhci_complete_del_and_free_cmd(struct xhci_command *cmd, u32 status) |
| { |
| list_del(&cmd->cmd_list); |
| |
| if (cmd->completion) { |
| cmd->status = status; |
| complete(cmd->completion); |
| } else { |
| kfree(cmd); |
| } |
| } |
| |
| void xhci_cleanup_command_queue(struct xhci_hcd *xhci) |
| { |
| struct xhci_command *cur_cmd, *tmp_cmd; |
| list_for_each_entry_safe(cur_cmd, tmp_cmd, &xhci->cmd_list, cmd_list) |
| xhci_complete_del_and_free_cmd(cur_cmd, COMP_CMD_ABORT); |
| } |
| |
| /* |
| * Turn all commands on command ring with status set to "aborted" to no-op trbs. |
| * If there are other commands waiting then restart the ring and kick the timer. |
| * This must be called with command ring stopped and xhci->lock held. |
| */ |
| static void xhci_handle_stopped_cmd_ring(struct xhci_hcd *xhci, |
| struct xhci_command *cur_cmd) |
| { |
| struct xhci_command *i_cmd, *tmp_cmd; |
| u32 cycle_state; |
| |
| /* Turn all aborted commands in list to no-ops, then restart */ |
| list_for_each_entry_safe(i_cmd, tmp_cmd, &xhci->cmd_list, |
| cmd_list) { |
| |
| if (i_cmd->status != COMP_CMD_ABORT) |
| continue; |
| |
| i_cmd->status = COMP_CMD_STOP; |
| |
| xhci_dbg(xhci, "Turn aborted command %p to no-op\n", |
| i_cmd->command_trb); |
| /* get cycle state from the original cmd trb */ |
| cycle_state = le32_to_cpu( |
| i_cmd->command_trb->generic.field[3]) & TRB_CYCLE; |
| /* modify the command trb to no-op command */ |
| i_cmd->command_trb->generic.field[0] = 0; |
| i_cmd->command_trb->generic.field[1] = 0; |
| i_cmd->command_trb->generic.field[2] = 0; |
| i_cmd->command_trb->generic.field[3] = cpu_to_le32( |
| TRB_TYPE(TRB_CMD_NOOP) | cycle_state); |
| |
| /* |
| * caller waiting for completion is called when command |
| * completion event is received for these no-op commands |
| */ |
| } |
| |
| xhci->cmd_ring_state = CMD_RING_STATE_RUNNING; |
| |
| /* ring command ring doorbell to restart the command ring */ |
| if ((xhci->cmd_ring->dequeue != xhci->cmd_ring->enqueue) && |
| !(xhci->xhc_state & XHCI_STATE_DYING)) { |
| xhci->current_cmd = cur_cmd; |
| mod_timer(&xhci->cmd_timer, jiffies + XHCI_CMD_DEFAULT_TIMEOUT); |
| xhci_ring_cmd_db(xhci); |
| } |
| return; |
| } |
| |
| |
| void xhci_handle_command_timeout(unsigned long data) |
| { |
| struct xhci_hcd *xhci; |
| int ret; |
| unsigned long flags; |
| u64 hw_ring_state; |
| struct xhci_command *cur_cmd = NULL; |
| xhci = (struct xhci_hcd *) data; |
| |
| /* mark this command to be cancelled */ |
| spin_lock_irqsave(&xhci->lock, flags); |
| if (xhci->current_cmd) { |
| cur_cmd = xhci->current_cmd; |
| cur_cmd->status = COMP_CMD_ABORT; |
| } |
| |
| |
| /* Make sure command ring is running before aborting it */ |
| hw_ring_state = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); |
| if ((xhci->cmd_ring_state & CMD_RING_STATE_RUNNING) && |
| (hw_ring_state & CMD_RING_RUNNING)) { |
| |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| xhci_dbg(xhci, "Command timeout\n"); |
| ret = xhci_abort_cmd_ring(xhci); |
| if (unlikely(ret == -ESHUTDOWN)) { |
| xhci_err(xhci, "Abort command ring failed\n"); |
| xhci_cleanup_command_queue(xhci); |
| usb_hc_died(xhci_to_hcd(xhci)->primary_hcd); |
| xhci_dbg(xhci, "xHCI host controller is dead.\n"); |
| } |
| return; |
| } |
| /* command timeout on stopped ring, ring can't be aborted */ |
| xhci_dbg(xhci, "Command timeout on stopped ring\n"); |
| xhci_handle_stopped_cmd_ring(xhci, xhci->current_cmd); |
| spin_unlock_irqrestore(&xhci->lock, flags); |
| return; |
| } |
| |
| static void handle_cmd_completion(struct xhci_hcd *xhci, |
| struct xhci_event_cmd *event) |
| { |
| int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); |
| u64 cmd_dma; |
| dma_addr_t cmd_dequeue_dma; |
| u32 cmd_comp_code; |
| union xhci_trb *cmd_trb; |
| struct xhci_command *cmd; |
| u32 cmd_type; |
| |
| cmd_dma = le64_to_cpu(event->cmd_trb); |
| cmd_trb = xhci->cmd_ring->dequeue; |
| cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg, |
| cmd_trb); |
| /* Is the command ring deq ptr out of sync with the deq seg ptr? */ |
| if (cmd_dequeue_dma == 0) { |
| xhci->error_bitmask |= 1 << 4; |
| return; |
| } |
| /* Does the DMA address match our internal dequeue pointer address? */ |
| if (cmd_dma != (u64) cmd_dequeue_dma) { |
| xhci->error_bitmask |= 1 << 5; |
| return; |
| } |
| |
| cmd = list_entry(xhci->cmd_list.next, struct xhci_command, cmd_list); |
| |
| if (cmd->command_trb != xhci->cmd_ring->dequeue) { |
| xhci_err(xhci, |
| "Command completion event does not match command\n"); |
| return; |
| } |
| |
| del_timer(&xhci->cmd_timer); |
| |
| trace_xhci_cmd_completion(cmd_trb, (struct xhci_generic_trb *) event); |
| |
| cmd_comp_code = GET_COMP_CODE(le32_to_cpu(event->status)); |
| |
| /* If CMD ring stopped we own the trbs between enqueue and dequeue */ |
| if (cmd_comp_code == COMP_CMD_STOP) { |
| xhci_handle_stopped_cmd_ring(xhci, cmd); |
| return; |
| } |
| /* |
| * Host aborted the command ring, check if the current command was |
| * supposed to be aborted, otherwise continue normally. |
| * The command ring is stopped now, but the xHC will issue a Command |
| * Ring Stopped event which will cause us to restart it. |
| */ |
| if (cmd_comp_code == COMP_CMD_ABORT) { |
| xhci->cmd_ring_state = CMD_RING_STATE_STOPPED; |
| if (cmd->status == COMP_CMD_ABORT) |
| goto event_handled; |
| } |
| |
| cmd_type = TRB_FIELD_TO_TYPE(le32_to_cpu(cmd_trb->generic.field[3])); |
| switch (cmd_type) { |
| case TRB_ENABLE_SLOT: |
| xhci_handle_cmd_enable_slot(xhci, slot_id, cmd_comp_code); |
| break; |
| case TRB_DISABLE_SLOT: |
| xhci_handle_cmd_disable_slot(xhci, slot_id); |
| break; |
| case TRB_CONFIG_EP: |
| if (!cmd->completion) |
| xhci_handle_cmd_config_ep(xhci, slot_id, event, |
| cmd_comp_code); |
| break; |
| case TRB_EVAL_CONTEXT: |
| break; |
| case TRB_ADDR_DEV: |
| break; |
| case TRB_STOP_RING: |
| WARN_ON(slot_id != TRB_TO_SLOT_ID( |
| le32_to_cpu(cmd_trb->generic.field[3]))); |
| xhci_handle_cmd_stop_ep(xhci, slot_id, cmd_trb, event); |
| break; |
| case TRB_SET_DEQ: |
| WARN_ON(slot_id != TRB_TO_SLOT_ID( |
| le32_to_cpu(cmd_trb->generic.field[3]))); |
| xhci_handle_cmd_set_deq(xhci, slot_id, cmd_trb, cmd_comp_code); |
| break; |
| case TRB_CMD_NOOP: |
| /* Is this an aborted command turned to NO-OP? */ |
| if (cmd->status == COMP_CMD_STOP) |
| cmd_comp_code = COMP_CMD_STOP; |
| break; |
| case TRB_RESET_EP: |
| WARN_ON(slot_id != TRB_TO_SLOT_ID( |
| le32_to_cpu(cmd_trb->generic.field[3]))); |
| xhci_handle_cmd_reset_ep(xhci, slot_id, cmd_trb, cmd_comp_code); |
| break; |
| case TRB_RESET_DEV: |
| /* SLOT_ID field in reset device cmd completion event TRB is 0. |
| * Use the SLOT_ID from the command TRB instead (xhci 4.6.11) |
| */ |
| slot_id = TRB_TO_SLOT_ID( |
| le32_to_cpu(cmd_trb->generic.field[3])); |
| xhci_handle_cmd_reset_dev(xhci, slot_id, event); |
| break; |
| case TRB_NEC_GET_FW: |
| xhci_handle_cmd_nec_get_fw(xhci, event); |
| break; |
| default: |
| /* Skip over unknown commands on the event ring */ |
| xhci->error_bitmask |= 1 << 6; |
| break; |
| } |
| |
| /* restart timer if this wasn't the last command */ |
| if (cmd->cmd_list.next != &xhci->cmd_list) { |
| xhci->current_cmd = list_entry(cmd->cmd_list.next, |
| struct xhci_command, cmd_list); |
| mod_timer(&xhci->cmd_timer, jiffies + XHCI_CMD_DEFAULT_TIMEOUT); |
| } |
| |
| event_handled: |
| xhci_complete_del_and_free_cmd(cmd, cmd_comp_code); |
| |
| inc_deq(xhci, xhci->cmd_ring); |
| } |
| |
| static void handle_vendor_event(struct xhci_hcd *xhci, |
| union xhci_trb *event) |
| { |
| u32 trb_type; |
| |
| trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event->generic.field[3])); |
| xhci_dbg(xhci, "Vendor specific event TRB type = %u\n", trb_type); |
| if (trb_type == TRB_NEC_CMD_COMP && (xhci->quirks & XHCI_NEC_HOST)) |
| handle_cmd_completion(xhci, &event->event_cmd); |
| } |
| |
| /* @port_id: the one-based port ID from the hardware (indexed from array of all |
| * port registers -- USB 3.0 and USB 2.0). |
| * |
| * Returns a zero-based port number, which is suitable for indexing into each of |
| * the split roothubs' port arrays and bus state arrays. |
| * Add one to it in order to call xhci_find_slot_id_by_port. |
| */ |
| static unsigned int find_faked_portnum_from_hw_portnum(struct usb_hcd *hcd, |
| struct xhci_hcd *xhci, u32 port_id) |
| { |
| unsigned int i; |
| unsigned int num_similar_speed_ports = 0; |
| |
| /* port_id from the hardware is 1-based, but port_array[], usb3_ports[], |
| * and usb2_ports are 0-based indexes. Count the number of similar |
| * speed ports, up to 1 port before this port. |
| */ |
| for (i = 0; i < (port_id - 1); i++) { |
| u8 port_speed = xhci->port_array[i]; |
| |
| /* |
| * Skip ports that don't have known speeds, or have duplicate |
| * Extended Capabilities port speed entries. |
| */ |
| if (port_speed == 0 || port_speed == DUPLICATE_ENTRY) |
| continue; |
| |
| /* |
| * USB 3.0 ports are always under a USB 3.0 hub. USB 2.0 and |
| * 1.1 ports are under the USB 2.0 hub. If the port speed |
| * matches the device speed, it's a similar speed port. |
| */ |
| if ((port_speed == 0x03) == (hcd->speed == HCD_USB3)) |
| num_similar_speed_ports++; |
| } |
| return num_similar_speed_ports; |
| } |
| |
| static void handle_device_notification(struct xhci_hcd *xhci, |
| union xhci_trb *event) |
| { |
| u32 slot_id; |
| struct usb_device *udev; |
| |
| slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->generic.field[3])); |
| if (!xhci->devs[slot_id]) { |
| xhci_warn(xhci, "Device Notification event for " |
| "unused slot %u\n", slot_id); |
| return; |
| } |
| |
| xhci_dbg(xhci, "Device Wake Notification event for slot ID %u\n", |
| slot_id); |
| udev = xhci->devs[slot_id]->udev; |
| if (udev && udev->parent) |
| usb_wakeup_notification(udev->parent, udev->portnum); |
| } |
| |
| static void handle_port_status(struct xhci_hcd *xhci, |
| union xhci_trb *event) |
| { |
| struct usb_hcd *hcd; |
| u32 port_id; |
| u32 temp, temp1; |
| int max_ports; |
| int slot_id; |
| unsigned int faked_port_index; |
| u8 major_revision; |
| struct xhci_bus_state *bus_state; |
| __le32 __iomem **port_array; |
| bool bogus_port_status = false; |
| |
| /* Port status change events always have a successful completion code */ |
| if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS) { |
| xhci_warn(xhci, "WARN: xHC returned failed port status event\n"); |
| xhci->error_bitmask |= 1 << 8; |
| } |
| port_id = GET_PORT_ID(le32_to_cpu(event->generic.field[0])); |
| xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id); |
| |
| max_ports = HCS_MAX_PORTS(xhci->hcs_params1); |
| if ((port_id <= 0) || (port_id > max_ports)) { |
| xhci_warn(xhci, "Invalid port id %d\n", port_id); |
| inc_deq(xhci, xhci->event_ring); |
| return; |
| } |
| |
| /* Figure out which usb_hcd this port is attached to: |
| * is it a USB 3.0 port or a USB 2.0/1.1 port? |
| */ |
| major_revision = xhci->port_array[port_id - 1]; |
| |
| /* Find the right roothub. */ |
| hcd = xhci_to_hcd(xhci); |
| if ((major_revision == 0x03) != (hcd->speed == HCD_USB3)) |
| hcd = xhci->shared_hcd; |
| |
| if (major_revision == 0) { |
| xhci_warn(xhci, "Event for port %u not in " |
| "Extended Capabilities, ignoring.\n", |
| port_id); |
| bogus_port_status = true; |
| goto cleanup; |
| } |
| if (major_revision == DUPLICATE_ENTRY) { |
| xhci_warn(xhci, "Event for port %u duplicated in" |
| "Extended Capabilities, ignoring.\n", |
| port_id); |
| bogus_port_status = true; |
| goto cleanup; |
| } |
| |
| /* |
| * Hardware port IDs reported by a Port Status Change Event include USB |
| * 3.0 and USB 2.0 ports. We want to check if the port has reported a |
| * resume event, but we first need to translate the hardware port ID |
| * into the index into the ports on the correct split roothub, and the |
| * correct bus_state structure. |
| */ |
| bus_state = &xhci->bus_state[hcd_index(hcd)]; |
| if (hcd->speed == HCD_USB3) |
| port_array = xhci->usb3_ports; |
| else |
| port_array = xhci->usb2_ports; |
| /* Find the faked port hub number */ |
| faked_port_index = find_faked_portnum_from_hw_portnum(hcd, xhci, |
| port_id); |
| |
| temp = readl(port_array[faked_port_index]); |
| if (hcd->state == HC_STATE_SUSPENDED) { |
| xhci_dbg(xhci, "resume root hub\n"); |
| usb_hcd_resume_root_hub(hcd); |
| } |
| |
| if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_RESUME) { |
| xhci_dbg(xhci, "port resume event for port %d\n", port_id); |
| |
| temp1 = readl(&xhci->op_regs->command); |
| if (!(temp1 & CMD_RUN)) { |
| xhci_warn(xhci, "xHC is not running.\n"); |
| goto cleanup; |
| } |
| |
| if (DEV_SUPERSPEED(temp)) { |
| xhci_dbg(xhci, "remote wake SS port %d\n", port_id); |
| /* Set a flag to say the port signaled remote wakeup, |
| * so we can tell the difference between the end of |
| * device and host initiated resume. |
| */ |
| bus_state->port_remote_wakeup |= 1 << faked_port_index; |
| xhci_test_and_clear_bit(xhci, port_array, |
| faked_port_index, PORT_PLC); |
| xhci_set_link_state(xhci, port_array, faked_port_index, |
| XDEV_U0); |
| /* Need to wait until the next link state change |
| * indicates the device is actually in U0. |
| */ |
| bogus_port_status = true; |
| goto cleanup; |
| } else { |
| xhci_dbg(xhci, "resume HS port %d\n", port_id); |
| bus_state->resume_done[faked_port_index] = jiffies + |
| msecs_to_jiffies(20); |
| set_bit(faked_port_index, &bus_state->resuming_ports); |
| mod_timer(&hcd->rh_timer, |
| bus_state->resume_done[faked_port_index]); |
| /* Do the rest in GetPortStatus */ |
| } |
| } |
| |
| if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_U0 && |
| DEV_SUPERSPEED(temp)) { |
| xhci_dbg(xhci, "resume SS port %d finished\n", port_id); |
| /* We've just brought the device into U0 through either the |
| * Resume state after a device remote wakeup, or through the |
| * U3Exit state after a host-initiated resume. If it's a device |
| * initiated remote wake, don't pass up the link state change, |
| * so the roothub behavior is consistent with external |
| * USB 3.0 hub behavior. |
| */ |
| slot_id = xhci_find_slot_id_by_port(hcd, xhci, |
| faked_port_index + 1); |
| if (slot_id && xhci->devs[slot_id]) |
| xhci_ring_device(xhci, slot_id); |
| if (bus_state->port_remote_wakeup & (1 << faked_port_index)) { |
| bus_state->port_remote_wakeup &= |
| ~(1 << faked_port_index); |
| xhci_test_and_clear_bit(xhci, port_array, |
| faked_port_index, PORT_PLC); |
| usb_wakeup_notification(hcd->self.root_hub, |
| faked_port_index + 1); |
| bogus_port_status = true; |
| goto cleanup; |
| } |
| } |
| |
| /* |
| * Check to see if xhci-hub.c is waiting on RExit to U0 transition (or |
| * RExit to a disconnect state). If so, let the the driver know it's |
| * out of the RExit state. |
| */ |
| if (!DEV_SUPERSPEED(temp) && |
| test_and_clear_bit(faked_port_index, |
| &bus_state->rexit_ports)) { |
| complete(&bus_state->rexit_done[faked_port_index]); |
| bogus_port_status = true; |
| goto cleanup; |
| } |
| |
| if (hcd->speed != HCD_USB3) |
| xhci_test_and_clear_bit(xhci, port_array, faked_port_index, |
| PORT_PLC); |
| |
| cleanup: |
| /* Update event ring dequeue pointer before dropping the lock */ |
| inc_deq(xhci, xhci->event_ring); |
| |
| /* Don't make the USB core poll the roothub if we got a bad port status |
| * change event. Besides, at that point we can't tell which roothub |
| * (USB 2.0 or USB 3.0) to kick. |
| */ |
| if (bogus_port_status) |
| return; |
| |
| /* |
| * xHCI port-status-change events occur when the "or" of all the |
| * status-change bits in the portsc register changes from 0 to 1. |
| * New status changes won't cause an event if any other change |
| * bits are still set. When an event occurs, switch over to |
| * polling to avoid losing status changes. |
| */ |
| xhci_dbg(xhci, "%s: starting port polling.\n", __func__); |
| set_bit(HCD_FLAG_POLL_RH, &hcd->flags); |
| spin_unlock(&xhci->lock); |
| /* Pass this up to the core */ |
| usb_hcd_poll_rh_status(hcd); |
| spin_lock(&xhci->lock); |
| } |
| |
| /* |
| * This TD is defined by the TRBs starting at start_trb in start_seg and ending |
| * at end_trb, which may be in another segment. If the suspect DMA address is a |
| * TRB in this TD, this function returns that TRB's segment. Otherwise it |
| * returns 0. |
| */ |
| struct xhci_segment *trb_in_td(struct xhci_hcd *xhci, |
| struct xhci_segment *start_seg, |
| union xhci_trb *start_trb, |
| union xhci_trb *end_trb, |
| dma_addr_t suspect_dma, |
| bool debug) |
| { |
| dma_addr_t start_dma; |
| dma_addr_t end_seg_dma; |
| dma_addr_t end_trb_dma; |
| struct xhci_segment *cur_seg; |
| |
| start_dma = xhci_trb_virt_to_dma(start_seg, start_trb); |
| cur_seg = start_seg; |
| |
| do { |
| if (start_dma == 0) |
| return NULL; |
| /* We may get an event for a Link TRB in the middle of a TD */ |
| end_seg_dma = xhci_trb_virt_to_dma(cur_seg, |
| &cur_seg->trbs[TRBS_PER_SEGMENT - 1]); |
| /* If the end TRB isn't in this segment, this is set to 0 */ |
| end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb); |
| |
| if (debug) |
| xhci_warn(xhci, |
| "Looking for event-dma %016llx trb-start %016llx trb-end %016llx seg-start %016llx seg-end %016llx\n", |
| (unsigned long long)suspect_dma, |
| (unsigned long long)start_dma, |
| (unsigned long long)end_trb_dma, |
| (unsigned long long)cur_seg->dma, |
| (unsigned long long)end_seg_dma); |
| |
| if (end_trb_dma > 0) { |
| /* The end TRB is in this segment, so suspect should be here */ |
| if (start_dma <= end_trb_dma) { |
| if (suspect_dma >= start_dma && suspect_dma <= end_trb_dma) |
| return cur_seg; |
| } else { |
| /* Case for one segment with |
| * a TD wrapped around to the top |
| */ |
| if ((suspect_dma >= start_dma && |
| suspect_dma <= end_seg_dma) || |
| (suspect_dma >= cur_seg->dma && |
| suspect_dma <= end_trb_dma)) |
| return cur_seg; |
| } |
| return NULL; |
| } else { |
| /* Might still be somewhere in this segment */ |
| if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma) |
| return cur_seg; |
| } |
| cur_seg = cur_seg->next; |
| start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]); |
| } while (cur_seg != start_seg); |
| |
| return NULL; |
| } |
| |
| static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci, |
| unsigned int slot_id, unsigned int ep_index, |
| unsigned int stream_id, |
| struct xhci_td *td, union xhci_trb *event_trb) |
| { |
| struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index]; |
| struct xhci_command *command; |
| command = xhci_alloc_command(xhci, false, false, GFP_ATOMIC); |
| if (!command) |
| return; |
| |
| ep->ep_state |= EP_HALTED | EP_RECENTLY_HALTED; |
| ep->stopped_stream = stream_id; |
| |
| xhci_queue_reset_ep(xhci, command, slot_id, ep_index); |
| xhci_cleanup_stalled_ring(xhci, ep_index, td); |
| |
| ep->stopped_stream = 0; |
| |
| xhci_ring_cmd_db(xhci); |
| } |
| |
| /* Check if an error has halted the endpoint ring. The class driver will |
| * cleanup the halt for a non-default control endpoint if we indicate a stall. |
| * However, a babble and other errors also halt the endpoint ring, and the class |
| * driver won't clear the halt in that case, so we need to issue a Set Transfer |
| * Ring Dequeue Pointer command manually. |
| */ |
| static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci, |
| struct xhci_ep_ctx *ep_ctx, |
| unsigned int trb_comp_code) |
| { |
| /* TRB completion codes that may require a manual halt cleanup */ |
| if (trb_comp_code == COMP_TX_ERR || |
| trb_comp_code == COMP_BABBLE || |
| trb_comp_code == COMP_SPLIT_ERR) |
| /* The 0.96 spec says a babbling control endpoint |
| * is not halted. The 0.96 spec says it is. Some HW |
| * claims to be 0.95 compliant, but it halts the control |
| * endpoint anyway. Check if a babble halted the |
| * endpoint. |
| */ |
| if ((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) == |
| cpu_to_le32(EP_STATE_HALTED)) |
| return 1; |
| |
| return 0; |
| } |
| |
| int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code) |
| { |
| if (trb_comp_code >= 224 && trb_comp_code <= 255) { |
| /* Vendor defined "informational" completion code, |
| * treat as not-an-error. |
| */ |
| xhci_dbg(xhci, "Vendor defined info completion code %u\n", |
| trb_comp_code); |
| xhci_dbg(xhci, "Treating code as success.\n"); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Finish the td processing, remove the td from td list; |
| * Return 1 if the urb can be given back. |
| */ |
| static int finish_td(struct xhci_hcd *xhci, struct xhci_td *td, |
| union xhci_trb *event_trb, struct xhci_transfer_event *event, |
| struct xhci_virt_ep *ep, int *status, bool skip) |
| { |
| struct xhci_virt_device *xdev; |
| struct xhci_ring *ep_ring; |
| unsigned int slot_id; |
| int ep_index; |
| struct urb *urb = NULL; |
| struct xhci_ep_ctx *ep_ctx; |
| int ret = 0; |
| struct urb_priv *urb_priv; |
| u32 trb_comp_code; |
| |
| slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); |
| xdev = xhci->devs[slot_id]; |
| ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1; |
| ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); |
| ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
| trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); |
| |
| if (skip) |
| goto td_cleanup; |
| |
| if (trb_comp_code == COMP_STOP_INVAL || trb_comp_code == COMP_STOP) { |
| /* The Endpoint Stop Command completion will take care of any |
| * stopped TDs. A stopped TD may be restarted, so don't update |
| * the ring dequeue pointer or take this TD off any lists yet. |
| */ |
| ep->stopped_td = td; |
| return 0; |
| } |
| if (trb_comp_code == COMP_STALL || |
| xhci_requires_manual_halt_cleanup(xhci, ep_ctx, |
| trb_comp_code)) { |
| /* Issue a reset endpoint command to clear the host side |
| * halt, followed by a set dequeue command to move the |
| * dequeue pointer past the TD. |
| * The class driver clears the device side halt later. |
| */ |
| xhci_cleanup_halted_endpoint(xhci, slot_id, ep_index, |
| ep_ring->stream_id, td, event_trb); |
| } else { |
| /* Update ring dequeue pointer */ |
| while (ep_ring->dequeue != td->last_trb) |
| inc_deq(xhci, ep_ring); |
| inc_deq(xhci, ep_ring); |
| } |
| |
| td_cleanup: |
| /* Clean up the endpoint's TD list */ |
| urb = td->urb; |
| urb_priv = urb->hcpriv; |
| |
| /* Do one last check of the actual transfer length. |
| * If the host controller said we transferred more data than the buffer |
| * length, urb->actual_length will be a very big number (since it's |
| * unsigned). Play it safe and say we didn't transfer anything. |
| */ |
| if (urb->actual_length > urb->transfer_buffer_length) { |
| xhci_warn(xhci, "URB transfer length is wrong, xHC issue? req. len = %u, act. len = %u\n", |
| urb->transfer_buffer_length, |
| urb->actual_length); |
| urb->actual_length = 0; |
| if (td->urb->transfer_flags & URB_SHORT_NOT_OK) |
| *status = -EREMOTEIO; |
| else |
| *status = 0; |
| } |
| list_del_init(&td->td_list); |
| /* Was this TD slated to be cancelled but completed anyway? */ |
| if (!list_empty(&td->cancelled_td_list)) |
| list_del_init(&td->cancelled_td_list); |
| |
| urb_priv->td_cnt++; |
| /* Giveback the urb when all the tds are completed */ |
| if (urb_priv->td_cnt == urb_priv->length) { |
| ret = 1; |
| if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { |
| xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--; |
| if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) { |
| if (xhci->quirks & XHCI_AMD_PLL_FIX) |
| usb_amd_quirk_pll_enable(); |
| } |
| } |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Process control tds, update urb status and actual_length. |
| */ |
| static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td, |
| union xhci_trb *event_trb, struct xhci_transfer_event *event, |
| struct xhci_virt_ep *ep, int *status) |
| { |
| struct xhci_virt_device *xdev; |
| struct xhci_ring *ep_ring; |
| unsigned int slot_id; |
| int ep_index; |
| struct xhci_ep_ctx *ep_ctx; |
| u32 trb_comp_code; |
| |
| slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); |
| xdev = xhci->devs[slot_id]; |
| ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1; |
| ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); |
| ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
| trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); |
| |
| switch (trb_comp_code) { |
| case COMP_SUCCESS: |
| if (event_trb == ep_ring->dequeue) { |
| xhci_warn(xhci, "WARN: Success on ctrl setup TRB " |
| "without IOC set??\n"); |
| *status = -ESHUTDOWN; |
| } else if (event_trb != td->last_trb) { |
| xhci_warn(xhci, "WARN: Success on ctrl data TRB " |
| "without IOC set??\n"); |
| *status = -ESHUTDOWN; |
| } else { |
| *status = 0; |
| } |
| break; |
| case COMP_SHORT_TX: |
| if (td->urb->transfer_flags & URB_SHORT_NOT_OK) |
| *status = -EREMOTEIO; |
| else |
| *status = 0; |
| break; |
| case COMP_STOP_INVAL: |
| case COMP_STOP: |
| return finish_td(xhci, td, event_trb, event, ep, status, false); |
| default: |
| if (!xhci_requires_manual_halt_cleanup(xhci, |
| ep_ctx, trb_comp_code)) |
| break; |
| xhci_dbg(xhci, "TRB error code %u, " |
| "halted endpoint index = %u\n", |
| trb_comp_code, ep_index); |
| /* else fall through */ |
| case COMP_STALL: |
| /* Did we transfer part of the data (middle) phase? */ |
| if (event_trb != ep_ring->dequeue && |
| event_trb != td->last_trb) |
| td->urb->actual_length = |
| td->urb->transfer_buffer_length - |
| EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); |
| else |
| td->urb->actual_length = 0; |
| |
| return finish_td(xhci, td, event_trb, event, ep, status, false); |
| } |
| /* |
| * Did we transfer any data, despite the errors that might have |
| * happened? I.e. did we get past the setup stage? |
| */ |
| if (event_trb != ep_ring->dequeue) { |
| /* The event was for the status stage */ |
| if (event_trb == td->last_trb) { |
| if (td->urb->actual_length != 0) { |
| /* Don't overwrite a previously set error code |
| */ |
| if ((*status == -EINPROGRESS || *status == 0) && |
| (td->urb->transfer_flags |
| & URB_SHORT_NOT_OK)) |
| /* Did we already see a short data |
| * stage? */ |
| *status = -EREMOTEIO; |
| } else { |
| td->urb->actual_length = |
| td->urb->transfer_buffer_length; |
| } |
| } else { |
| /* Maybe the event was for the data stage? */ |
| td->urb->actual_length = |
| td->urb->transfer_buffer_length - |
| EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); |
| xhci_dbg(xhci, "Waiting for status " |
| "stage event\n"); |
| return 0; |
| } |
| } |
| |
| return finish_td(xhci, td, event_trb, event, ep, status, false); |
| } |
| |
| /* |
| * Process isochronous tds, update urb packet status and actual_length. |
| */ |
| static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, |
| union xhci_trb *event_trb, struct xhci_transfer_event *event, |
| struct xhci_virt_ep *ep, int *status) |
| { |
| struct xhci_ring *ep_ring; |
| struct urb_priv *urb_priv; |
| int idx; |
| int len = 0; |
| union xhci_trb *cur_trb; |
| struct xhci_segment *cur_seg; |
| struct usb_iso_packet_descriptor *frame; |
| u32 trb_comp_code; |
| bool skip_td = false; |
| |
| ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); |
| trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); |
| urb_priv = td->urb->hcpriv; |
| idx = urb_priv->td_cnt; |
| frame = &td->urb->iso_frame_desc[idx]; |
| |
| /* handle completion code */ |
| switch (trb_comp_code) { |
| case COMP_SUCCESS: |
| if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0) { |
| frame->status = 0; |
| break; |
| } |
| if ((xhci->quirks & XHCI_TRUST_TX_LENGTH)) |
| trb_comp_code = COMP_SHORT_TX; |
| case COMP_SHORT_TX: |
| frame->status = td->urb->transfer_flags & URB_SHORT_NOT_OK ? |
| -EREMOTEIO : 0; |
| break; |
| case COMP_BW_OVER: |
| frame->status = -ECOMM; |
| skip_td = true; |
| break; |
| case COMP_BUFF_OVER: |
| case COMP_BABBLE: |
| frame->status = -EOVERFLOW; |
| skip_td = true; |
| break; |
| case COMP_DEV_ERR: |
| case COMP_STALL: |
| case COMP_TX_ERR: |
| frame->status = -EPROTO; |
| skip_td = true; |
| break; |
| case COMP_STOP: |
| case COMP_STOP_INVAL: |
| break; |
| default: |
| frame->status = -1; |
| break; |
| } |
| |
| if (trb_comp_code == COMP_SUCCESS || skip_td) { |
| frame->actual_length = frame->length; |
| td->urb->actual_length += frame->length; |
| } else { |
| for (cur_trb = ep_ring->dequeue, |
| cur_seg = ep_ring->deq_seg; cur_trb != event_trb; |
| next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { |
| if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) && |
| !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) |
| len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])); |
| } |
| len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) - |
| EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); |
| |
| if (trb_comp_code != COMP_STOP_INVAL) { |
| frame->actual_length = len; |
| td->urb->actual_length += len; |
| } |
| } |
| |
| return finish_td(xhci, td, event_trb, event, ep, status, false); |
| } |
| |
| static int skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, |
| struct xhci_transfer_event *event, |
| struct xhci_virt_ep *ep, int *status) |
| { |
| struct xhci_ring *ep_ring; |
| struct urb_priv *urb_priv; |
| struct usb_iso_packet_descriptor *frame; |
| int idx; |
| |
| ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); |
| urb_priv = td->urb->hcpriv; |
| idx = urb_priv->td_cnt; |
| frame = &td->urb->iso_frame_desc[idx]; |
| |
| /* The transfer is partly done. */ |
| frame->status = -EXDEV; |
| |
| /* calc actual length */ |
| frame->actual_length = 0; |
| |
| /* Update ring dequeue pointer */ |
| while (ep_ring->dequeue != td->last_trb) |
| inc_deq(xhci, ep_ring); |
| inc_deq(xhci, ep_ring); |
| |
| return finish_td(xhci, td, NULL, event, ep, status, true); |
| } |
| |
| /* |
| * Process bulk and interrupt tds, update urb status and actual_length. |
| */ |
| static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, |
| union xhci_trb *event_trb, struct xhci_transfer_event *event, |
| struct xhci_virt_ep *ep, int *status) |
| { |
| struct xhci_ring *ep_ring; |
| union xhci_trb *cur_trb; |
| struct xhci_segment *cur_seg; |
| u32 trb_comp_code; |
| |
| ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); |
| trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); |
| |
| switch (trb_comp_code) { |
| case COMP_SUCCESS: |
| /* Double check that the HW transferred everything. */ |
| if (event_trb != td->last_trb || |
| EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) { |
| xhci_warn(xhci, "WARN Successful completion " |
| "on short TX\n"); |
| if (td->urb->transfer_flags & URB_SHORT_NOT_OK) |
| *status = -EREMOTEIO; |
| else |
| *status = 0; |
| if ((xhci->quirks & XHCI_TRUST_TX_LENGTH)) |
| trb_comp_code = COMP_SHORT_TX; |
| } else { |
| *status = 0; |
| } |
| break; |
| case COMP_SHORT_TX: |
| if (td->urb->transfer_flags & URB_SHORT_NOT_OK) |
| *status = -EREMOTEIO; |
| else |
| *status = 0; |
| break; |
| default: |
| /* Others already handled above */ |
| break; |
| } |
| if (trb_comp_code == COMP_SHORT_TX) |
| xhci_dbg(xhci, "ep %#x - asked for %d bytes, " |
| "%d bytes untransferred\n", |
| td->urb->ep->desc.bEndpointAddress, |
| td->urb->transfer_buffer_length, |
| EVENT_TRB_LEN(le32_to_cpu(event->transfer_len))); |
| /* Fast path - was this the last TRB in the TD for this URB? */ |
| if (event_trb == td->last_trb) { |
| if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) { |
| td->urb->actual_length = |
| td->urb->transfer_buffer_length - |
| EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); |
| if (td->urb->transfer_buffer_length < |
| td->urb->actual_length) { |
| xhci_warn(xhci, "HC gave bad length " |
| "of %d bytes left\n", |
| EVENT_TRB_LEN(le32_to_cpu(event->transfer_len))); |
| td->urb->actual_length = 0; |
| if (td->urb->transfer_flags & URB_SHORT_NOT_OK) |
| *status = -EREMOTEIO; |
| else |
| *status = 0; |
| } |
| /* Don't overwrite a previously set error code */ |
| if (*status == -EINPROGRESS) { |
| if (td->urb->transfer_flags & URB_SHORT_NOT_OK) |
| *status = -EREMOTEIO; |
| else |
| *status = 0; |
| } |
| } else { |
| td->urb->actual_length = |
| td->urb->transfer_buffer_length; |
| /* Ignore a short packet completion if the |
| * untransferred length was zero. |
| */ |
| if (*status == -EREMOTEIO) |
| *status = 0; |
| } |
| } else { |
| /* Slow path - walk the list, starting from the dequeue |
| * pointer, to get the actual length transferred. |
| */ |
| td->urb->actual_length = 0; |
| for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg; |
| cur_trb != event_trb; |
| next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { |
| if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) && |
| !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) |
| td->urb->actual_length += |
| TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])); |
| } |
| /* If the ring didn't stop on a Link or No-op TRB, add |
| * in the actual bytes transferred from the Normal TRB |
| */ |
| if (trb_comp_code != COMP_STOP_INVAL) |
| td->urb->actual_length += |
| TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) - |
| EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); |
| } |
| |
| return finish_td(xhci, td, event_trb, event, ep, status, false); |
| } |
| |
| /* |
| * If this function returns an error condition, it means it got a Transfer |
| * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address. |
| * At this point, the host controller is probably hosed and should be reset. |
| */ |
| static int handle_tx_event(struct xhci_hcd *xhci, |
| struct xhci_transfer_event *event) |
| __releases(&xhci->lock) |
| __acquires(&xhci->lock) |
| { |
| struct xhci_virt_device *xdev; |
| struct xhci_virt_ep *ep; |
| struct xhci_ring *ep_ring; |
| unsigned int slot_id; |
| int ep_index; |
| struct xhci_td *td = NULL; |
| dma_addr_t event_dma; |
| struct xhci_segment *event_seg; |
| union xhci_trb *event_trb; |
| struct urb *urb = NULL; |
| int status = -EINPROGRESS; |
| struct urb_priv *urb_priv; |
| struct xhci_ep_ctx *ep_ctx; |
| struct list_head *tmp; |
| u32 trb_comp_code; |
| int ret = 0; |
| int td_num = 0; |
| |
| slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); |
| xdev = xhci->devs[slot_id]; |
| if (!xdev) { |
| xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n"); |
| xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n", |
| (unsigned long long) xhci_trb_virt_to_dma( |
| xhci->event_ring->deq_seg, |
| xhci->event_ring->dequeue), |
| lower_32_bits(le64_to_cpu(event->buffer)), |
| upper_32_bits(le64_to_cpu(event->buffer)), |
| le32_to_cpu(event->transfer_len), |
| le32_to_cpu(event->flags)); |
| xhci_dbg(xhci, "Event ring:\n"); |
| xhci_debug_segment(xhci, xhci->event_ring->deq_seg); |
| return -ENODEV; |
| } |
| |
| /* Endpoint ID is 1 based, our index is zero based */ |
| ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1; |
| ep = &xdev->eps[ep_index]; |
| ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer)); |
| ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
| if (!ep_ring || |
| (le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) == |
| EP_STATE_DISABLED) { |
| xhci_err(xhci, "ERROR Transfer event for disabled endpoint " |
| "or incorrect stream ring\n"); |
| xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n", |
| (unsigned long long) xhci_trb_virt_to_dma( |
| xhci->event_ring->deq_seg, |
| xhci->event_ring->dequeue), |
| lower_32_bits(le64_to_cpu(event->buffer)), |
| upper_32_bits(le64_to_cpu(event->buffer)), |
| le32_to_cpu(event->transfer_len), |
| le32_to_cpu(event->flags)); |
| xhci_dbg(xhci, "Event ring:\n"); |
| xhci_debug_segment(xhci, xhci->event_ring->deq_seg); |
| return -ENODEV; |
| } |
| |
| /* Count current td numbers if ep->skip is set */ |
| if (ep->skip) { |
| list_for_each(tmp, &ep_ring->td_list) |
| td_num++; |
| } |
| |
| event_dma = le64_to_cpu(event->buffer); |
| trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len)); |
| /* Look for common error cases */ |
| switch (trb_comp_code) { |
| /* Skip codes that require special handling depending on |
| * transfer type |
| */ |
| case COMP_SUCCESS: |
| if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0) |
| break; |
| if (xhci->quirks & XHCI_TRUST_TX_LENGTH) |
| trb_comp_code = COMP_SHORT_TX; |
| else |
| xhci_warn_ratelimited(xhci, |
| "WARN Successful completion on short TX: needs XHCI_TRUST_TX_LENGTH quirk?\n"); |
| case COMP_SHORT_TX: |
| break; |
| case COMP_STOP: |
| xhci_dbg(xhci, "Stopped on Transfer TRB\n"); |
| break; |
| case COMP_STOP_INVAL: |
| xhci_dbg(xhci, "Stopped on No-op or Link TRB\n"); |
| break; |
| case COMP_STALL: |
| xhci_dbg(xhci, "Stalled endpoint\n"); |
| ep->ep_state |= EP_HALTED; |
| status = -EPIPE; |
| break; |
| case COMP_TRB_ERR: |
| xhci_warn(xhci, "WARN: TRB error on endpoint\n"); |
| status = -EILSEQ; |
| break; |
| case COMP_SPLIT_ERR: |
| case COMP_TX_ERR: |
| xhci_dbg(xhci, "Transfer error on endpoint\n"); |
| status = -EPROTO; |
| break; |
| case COMP_BABBLE: |
| xhci_dbg(xhci, "Babble error on endpoint\n"); |
| status = -EOVERFLOW; |
| break; |
| case COMP_DB_ERR: |
| xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n"); |
| status = -ENOSR; |
| break; |
| case COMP_BW_OVER: |
| xhci_warn(xhci, "WARN: bandwidth overrun event on endpoint\n"); |
| break; |
| case COMP_BUFF_OVER: |
| xhci_warn(xhci, "WARN: buffer overrun event on endpoint\n"); |
| break; |
| case COMP_UNDERRUN: |
| /* |
| * When the Isoch ring is empty, the xHC will generate |
| * a Ring Overrun Event for IN Isoch endpoint or Ring |
| * Underrun Event for OUT Isoch endpoint. |
| */ |
| xhci_dbg(xhci, "underrun event on endpoint\n"); |
| if (!list_empty(&ep_ring->td_list)) |
| xhci_dbg(xhci, "Underrun Event for slot %d ep %d " |
| "still with TDs queued?\n", |
| TRB_TO_SLOT_ID(le32_to_cpu(event->flags)), |
| ep_index); |
| goto cleanup; |
| case COMP_OVERRUN: |
| xhci_dbg(xhci, "overrun event on endpoint\n"); |
| if (!list_empty(&ep_ring->td_list)) |
| xhci_dbg(xhci, "Overrun Event for slot %d ep %d " |
| "still with TDs queued?\n", |
| TRB_TO_SLOT_ID(le32_to_cpu(event->flags)), |
| ep_index); |
| goto cleanup; |
| case COMP_DEV_ERR: |
| xhci_warn(xhci, "WARN: detect an incompatible device"); |
| status = -EPROTO; |
| break; |
| case COMP_MISSED_INT: |
| /* |
| * When encounter missed service error, one or more isoc tds |
| * may be missed by xHC. |
| * Set skip flag of the ep_ring; Complete the missed tds as |
| * short transfer when process the ep_ring next time. |
| */ |
| ep->skip = true; |
| xhci_dbg(xhci, "Miss service interval error, set skip flag\n"); |
| goto cleanup; |
| default: |
| if (xhci_is_vendor_info_code(xhci, trb_comp_code)) { |
| status = 0; |
| break; |
| } |
| xhci_warn(xhci, "ERROR Unknown event condition %u, HC probably busted\n", |
| trb_comp_code); |
| goto cleanup; |
| } |
| |
| do { |
| /* This TRB should be in the TD at the head of this ring's |
| * TD list. |
| */ |
| if (list_empty(&ep_ring->td_list)) { |
| /* |
| * A stopped endpoint may generate an extra completion |
| * event if the device was suspended. Don't print |
| * warnings. |
| */ |
| if (!(trb_comp_code == COMP_STOP || |
| trb_comp_code == COMP_STOP_INVAL)) { |
| xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n", |
| TRB_TO_SLOT_ID(le32_to_cpu(event->flags)), |
| ep_index); |
| xhci_dbg(xhci, "Event TRB with TRB type ID %u\n", |
| (le32_to_cpu(event->flags) & |
| TRB_TYPE_BITMASK)>>10); |
| xhci_print_trb_offsets(xhci, (union xhci_trb *) event); |
| } |
| if (ep->skip) { |
| ep->skip = false; |
| xhci_dbg(xhci, "td_list is empty while skip " |
| "flag set. Clear skip flag.\n"); |
| } |
| ret = 0; |
| goto cleanup; |
| } |
| |
| /* We've skipped all the TDs on the ep ring when ep->skip set */ |
| if (ep->skip && td_num == 0) { |
| ep->skip = false; |
| xhci_dbg(xhci, "All tds on the ep_ring skipped. " |
| "Clear skip flag.\n"); |
| ret = 0; |
| goto cleanup; |
| } |
| |
| td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list); |
| if (ep->skip) |
| td_num--; |
| |
| /* Is this a TRB in the currently executing TD? */ |
| event_seg = trb_in_td(xhci, ep_ring->deq_seg, ep_ring->dequeue, |
| td->last_trb, event_dma, false); |
| |
| /* |
| * Skip the Force Stopped Event. The event_trb(event_dma) of FSE |
| * is not in the current TD pointed by ep_ring->dequeue because |
| * that the hardware dequeue pointer still at the previous TRB |
| * of the current TD. The previous TRB maybe a Link TD or the |
| * last TRB of the previous TD. The command completion handle |
| * will take care the rest. |
| */ |
| if (!event_seg && (trb_comp_code == COMP_STOP || |
| trb_comp_code == COMP_STOP_INVAL)) { |
| ret = 0; |
| goto cleanup; |
| } |
| |
| if (!event_seg) { |
| if (!ep->skip || |
| !usb_endpoint_xfer_isoc(&td->urb->ep->desc)) { |
| /* Some host controllers give a spurious |
| * successful event after a short transfer. |
| * Ignore it. |
| */ |
| if ((xhci->quirks & XHCI_SPURIOUS_SUCCESS) && |
| ep_ring->last_td_was_short) { |
| ep_ring->last_td_was_short = false; |
| ret = 0; |
| goto cleanup; |
| } |
| /* HC is busted, give up! */ |
| xhci_err(xhci, |
| "ERROR Transfer event TRB DMA ptr not " |
| "part of current TD ep_index %d " |
| "comp_code %u\n", ep_index, |
| trb_comp_code); |
| trb_in_td(xhci, ep_ring->deq_seg, |
| ep_ring->dequeue, td->last_trb, |
| event_dma, true); |
| return -ESHUTDOWN; |
| } |
| |
| ret = skip_isoc_td(xhci, td, event, ep, &status); |
| goto cleanup; |
| } |
| if (trb_comp_code == COMP_SHORT_TX) |
| ep_ring->last_td_was_short = true; |
| else |
| ep_ring->last_td_was_short = false; |
| |
| if (ep->skip) { |
| xhci_dbg(xhci, "Found td. Clear skip flag.\n"); |
| ep->skip = false; |
| } |
| |
| event_trb = &event_seg->trbs[(event_dma - event_seg->dma) / |
| sizeof(*event_trb)]; |
| /* |
| * No-op TRB should not trigger interrupts. |
| * If event_trb is a no-op TRB, it means the |
| * corresponding TD has been cancelled. Just ignore |
| * the TD. |
| */ |
| if (TRB_TYPE_NOOP_LE32(event_trb->generic.field[3])) { |
| xhci_dbg(xhci, |
| "event_trb is a no-op TRB. Skip it\n"); |
| goto cleanup; |
| } |
| |
| /* Now update the urb's actual_length and give back to |
| * the core |
| */ |
| if (usb_endpoint_xfer_control(&td->urb->ep->desc)) |
| ret = process_ctrl_td(xhci, td, event_trb, event, ep, |
| &status); |
| else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc)) |
| ret = process_isoc_td(xhci, td, event_trb, event, ep, |
| &status); |
| else |
| ret = process_bulk_intr_td(xhci, td, event_trb, event, |
| ep, &status); |
| |
| cleanup: |
| /* |
| * Do not update event ring dequeue pointer if ep->skip is set. |
| * Will roll back to continue process missed tds. |
| */ |
| if (trb_comp_code == COMP_MISSED_INT || !ep->skip) { |
| inc_deq(xhci, xhci->event_ring); |
| } |
| |
| if (ret) { |
| urb = td->urb; |
| urb_priv = urb->hcpriv; |
| |
| xhci_urb_free_priv(urb_priv); |
| |
| usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb); |
| if ((urb->actual_length != urb->transfer_buffer_length && |
| (urb->transfer_flags & |
| URB_SHORT_NOT_OK)) || |
| (status != 0 && |
| !usb_endpoint_xfer_isoc(&urb->ep->desc))) |
| xhci_dbg(xhci, "Giveback URB %p, len = %d, " |
| "expected = %d, status = %d\n", |
| urb, urb->actual_length, |
| urb->transfer_buffer_length, |
| status); |
| spin_unlock(&xhci->lock); |
| /* EHCI, UHCI, and OHCI always unconditionally set the |
| * urb->status of an isochronous endpoint to 0. |
| */ |
| if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) |
| status = 0; |
| usb_hcd_giveback_urb(bus_to_hcd(urb->dev->bus), urb, status); |
| spin_lock(&xhci->lock); |
| } |
| |
| /* |
| * If ep->skip is set, it means there are missed tds on the |
| * endpoint ring need to take care of. |
| * Process them as short transfer until reach the td pointed by |
| * the event. |
| */ |
| } while (ep->skip && trb_comp_code != COMP_MISSED_INT); |
| |
| return 0; |
| } |
| |
| /* |
| * This function handles all OS-owned events on the event ring. It may drop |
| * xhci->lock between event processing (e.g. to pass up port status changes). |
| * Returns >0 for "possibly more events to process" (caller should call again), |
| * otherwise 0 if done. In future, <0 returns should indicate error code. |
| */ |
| static int xhci_handle_event(struct xhci_hcd *xhci) |
| { |
| union xhci_trb *event; |
| int update_ptrs = 1; |
| int ret; |
| |
| if (!xhci->event_ring || !xhci->event_ring->dequeue) { |
| xhci->error_bitmask |= 1 << 1; |
| return 0; |
| } |
| |
| event = xhci->event_ring->dequeue; |
| /* Does the HC or OS own the TRB? */ |
| if ((le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE) != |
| xhci->event_ring->cycle_state) { |
| xhci->error_bitmask |= 1 << 2; |
| return 0; |
| } |
| |
| /* |
| * Barrier between reading the TRB_CYCLE (valid) flag above and any |
| * speculative reads of the event's flags/data below. |
| */ |
| rmb(); |
| /* FIXME: Handle more event types. */ |
| switch ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK)) { |
| case TRB_TYPE(TRB_COMPLETION): |
| handle_cmd_completion(xhci, &event->event_cmd); |
| break; |
| case TRB_TYPE(TRB_PORT_STATUS): |
| handle_port_status(xhci, event); |
| update_ptrs = 0; |
| break; |
| case TRB_TYPE(TRB_TRANSFER): |
| ret = handle_tx_event(xhci, &event->trans_event); |
| if (ret < 0) |
| xhci->error_bitmask |= 1 << 9; |
| else |
| update_ptrs = 0; |
| break; |
| case TRB_TYPE(TRB_DEV_NOTE): |
| handle_device_notification(xhci, event); |
| break; |
| default: |
| if ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK) >= |
| TRB_TYPE(48)) |
| handle_vendor_event(xhci, event); |
| else |
| xhci->error_bitmask |= 1 << 3; |
| } |
| /* Any of the above functions may drop and re-acquire the lock, so check |
| * to make sure a watchdog timer didn't mark the host as non-responsive. |
| */ |
| if (xhci->xhc_state & XHCI_STATE_DYING) { |
| xhci_dbg(xhci, "xHCI host dying, returning from " |
| "event handler.\n"); |
| return 0; |
| } |
| |
| if (update_ptrs) |
| /* Update SW event ring dequeue pointer */ |
| inc_deq(xhci, xhci->event_ring); |
| |
| /* Are there more items on the event ring? Caller will call us again to |
| * check. |
| */ |
| return 1; |
| } |
| |
| /* |
| * xHCI spec says we can get an interrupt, and if the HC has an error condition, |
| * we might get bad data out of the event ring. Section 4.10.2.7 has a list of |
| * indicators of an event TRB error, but we check the status *first* to be safe. |
| */ |
| irqreturn_t xhci_irq(struct usb_hcd *hcd) |
| { |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| u32 status; |
| u64 temp_64; |
| union xhci_trb *event_ring_deq; |
| dma_addr_t deq; |
| |
| spin_lock(&xhci->lock); |
| /* Check if the xHC generated the interrupt, or the irq is shared */ |
| status = readl(&xhci->op_regs->status); |
| if (status == 0xffffffff) |
| goto hw_died; |
| |
| if (!(status & STS_EINT)) { |
| spin_unlock(&xhci->lock); |
| return IRQ_NONE; |
| } |
| if (status & STS_FATAL) { |
| xhci_warn(xhci, "WARNING: Host System Error\n"); |
| xhci_halt(xhci); |
| hw_died: |
| spin_unlock(&xhci->lock); |
| return -ESHUTDOWN; |
| } |
| |
| /* |
| * Clear the op reg interrupt status first, |
| * so we can receive interrupts from other MSI-X interrupters. |
| * Write 1 to clear the interrupt status. |
| */ |
| status |= STS_EINT; |
| writel(status, &xhci->op_regs->status); |
| /* FIXME when MSI-X is supported and there are multiple vectors */ |
| /* Clear the MSI-X event interrupt status */ |
| |
| if (hcd->irq) { |
| u32 irq_pending; |
| /* Acknowledge the PCI interrupt */ |
| irq_pending = readl(&xhci->ir_set->irq_pending); |
| irq_pending |= IMAN_IP; |
| writel(irq_pending, &xhci->ir_set->irq_pending); |
| } |
| |
| if (xhci->xhc_state & XHCI_STATE_DYING) { |
| xhci_dbg(xhci, "xHCI dying, ignoring interrupt. " |
| "Shouldn't IRQs be disabled?\n"); |
| /* Clear the event handler busy flag (RW1C); |
| * the event ring should be empty. |
| */ |
| temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); |
| xhci_write_64(xhci, temp_64 | ERST_EHB, |
| &xhci->ir_set->erst_dequeue); |
| spin_unlock(&xhci->lock); |
| |
| return IRQ_HANDLED; |
| } |
| |
| event_ring_deq = xhci->event_ring->dequeue; |
| /* FIXME this should be a delayed service routine |
| * that clears the EHB. |
| */ |
| while (xhci_handle_event(xhci) > 0) {} |
| |
| temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); |
| /* If necessary, update the HW's version of the event ring deq ptr. */ |
| if (event_ring_deq != xhci->event_ring->dequeue) { |
| deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, |
| xhci->event_ring->dequeue); |
| if (deq == 0) |
| xhci_warn(xhci, "WARN something wrong with SW event " |
| "ring dequeue ptr.\n"); |
| /* Update HC event ring dequeue pointer */ |
| temp_64 &= ERST_PTR_MASK; |
| temp_64 |= ((u64) deq & (u64) ~ERST_PTR_MASK); |
| } |
| |
| /* Clear the event handler busy flag (RW1C); event ring is empty. */ |
| temp_64 |= ERST_EHB; |
| xhci_write_64(xhci, temp_64, &xhci->ir_set->erst_dequeue); |
| |
| spin_unlock(&xhci->lock); |
| |
| return IRQ_HANDLED; |
| } |
| |
| irqreturn_t xhci_msi_irq(int irq, void *hcd) |
| { |
| return xhci_irq(hcd); |
| } |
| |
| /**** Endpoint Ring Operations ****/ |
| |
| /* |
| * Generic function for queueing a TRB on a ring. |
| * The caller must have checked to make sure there's room on the ring. |
| * |
| * @more_trbs_coming: Will you enqueue more TRBs before calling |
| * prepare_transfer()? |
| */ |
| static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, |
| bool more_trbs_coming, |
| u32 field1, u32 field2, u32 field3, u32 field4) |
| { |
| struct xhci_generic_trb *trb; |
| |
| trb = &ring->enqueue->generic; |
| trb->field[0] = cpu_to_le32(field1); |
| trb->field[1] = cpu_to_le32(field2); |
| trb->field[2] = cpu_to_le32(field3); |
| trb->field[3] = cpu_to_le32(field4); |
| inc_enq(xhci, ring, more_trbs_coming); |
| } |
| |
| /* |
| * Does various checks on the endpoint ring, and makes it ready to queue num_trbs. |
| * FIXME allocate segments if the ring is full. |
| */ |
| 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: |
| /* |
| * USB core changed config/interfaces without notifying us, |
| * or hardware is reporting the wrong state. |
| */ |
| xhci_warn(xhci, "WARN urb submitted to disabled ep\n"); |
| return -ENOENT; |
| case EP_STATE_ERROR: |
| xhci_warn(xhci, "WARN waiting for error on ep to be cleared\n"); |
| /* FIXME event handling code for error needs to clear it */ |
| /* XXX not sure if this should be -ENOENT or not */ |
| return -EINVAL; |
| case EP_STATE_HALTED: |
| xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n"); |
| case EP_STATE_STOPPED: |
| case EP_STATE_RUNNING: |
| break; |
| default: |
| xhci_err(xhci, "ERROR unknown endpoint state for ep\n"); |
| /* |
| * FIXME issue Configure Endpoint command to try to get the HC |
| * back into a known state. |
| */ |
| return -EINVAL; |
| } |
| |
| 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; |
| } |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion, |
| "ERROR no room on ep ring, try ring expansion"); |
| 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; |
| union xhci_trb *next; |
| |
| next = ring->enqueue; |
| |
| while (last_trb(xhci, ring, ring->enq_seg, next)) { |
| /* If we're not dealing with 0.95 hardware or isoc rings |
| * on AMD 0.96 host, clear the chain bit. |
| */ |
| if (!xhci_link_trb_quirk(xhci) && |
| !(ring->type == TYPE_ISOC && |
| (xhci->quirks & XHCI_AMD_0x96_HOST))) |
| next->link.control &= cpu_to_le32(~TRB_CHAIN); |
| else |
| next->link.control |= cpu_to_le32(TRB_CHAIN); |
| |
| wmb(); |
| next->link.control ^= cpu_to_le32(TRB_CYCLE); |
| |
| /* Toggle the cycle bit after the last ring segment. */ |
| if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) { |
| ring->cycle_state = (ring->cycle_state ? 0 : 1); |
| } |
| ring->enq_seg = ring->enq_seg->next; |
| ring->enqueue = ring->enq_seg->trbs; |
| next = ring->enqueue; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int prepare_transfer(struct xhci_hcd *xhci, |
| struct xhci_virt_device *xdev, |
| unsigned int ep_index, |
| unsigned int stream_id, |
| unsigned int num_trbs, |
| struct urb *urb, |
| unsigned int td_index, |
| gfp_t mem_flags) |
| { |
| int ret; |
| struct urb_priv *urb_priv; |
| struct xhci_td *td; |
| struct xhci_ring *ep_ring; |
| struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
| |
| ep_ring = xhci_stream_id_to_ring(xdev, ep_index, stream_id); |
| if (!ep_ring) { |
| xhci_dbg(xhci, "Can't prepare ring for bad stream ID %u\n", |
| stream_id); |
| return -EINVAL; |
| } |
| |
| ret = prepare_ring(xhci, ep_ring, |
| le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK, |
| num_trbs, mem_flags); |
| if (ret) |
| return ret; |
| |
| urb_priv = urb->hcpriv; |
| td = urb_priv->td[td_index]; |
| |
| INIT_LIST_HEAD(&td->td_list); |
| INIT_LIST_HEAD(&td->cancelled_td_list); |
| |
| if (td_index == 0) { |
| ret = usb_hcd_link_urb_to_ep(bus_to_hcd(urb->dev->bus), urb); |
| if (unlikely(ret)) |
| return ret; |
| } |
| |
| td->urb = urb; |
| /* Add this TD to the tail of the endpoint ring's TD list */ |
| list_add_tail(&td->td_list, &ep_ring->td_list); |
| td->start_seg = ep_ring->enq_seg; |
| td->first_trb = ep_ring->enqueue; |
| |
| urb_priv->td[td_index] = td; |
| |
| return 0; |
| } |
| |
| static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb) |
| { |
| int num_sgs, num_trbs, running_total, temp, i; |
| struct scatterlist *sg; |
| |
| sg = NULL; |
| num_sgs = urb->num_mapped_sgs; |
| temp = urb->transfer_buffer_length; |
| |
| num_trbs = 0; |
| for_each_sg(urb->sg, sg, num_sgs, i) { |
| unsigned int len = sg_dma_len(sg); |
| |
| /* Scatter gather list entries may cross 64KB boundaries */ |
| running_total = TRB_MAX_BUFF_SIZE - |
| (sg_dma_address(sg) & (TRB_MAX_BUFF_SIZE - 1)); |
| running_total &= TRB_MAX_BUFF_SIZE - 1; |
| if (running_total != 0) |
| num_trbs++; |
| |
| /* How many more 64KB chunks to transfer, how many more TRBs? */ |
| while (running_total < sg_dma_len(sg) && running_total < temp) { |
| num_trbs++; |
| running_total += TRB_MAX_BUFF_SIZE; |
| } |
| len = min_t(int, len, temp); |
| temp -= len; |
| if (temp == 0) |
| break; |
| } |
| return num_trbs; |
| } |
| |
| static void check_trb_math(struct urb *urb, int num_trbs, int running_total) |
| { |
| if (num_trbs != 0) |
| dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated number of " |
| "TRBs, %d left\n", __func__, |
| urb->ep->desc.bEndpointAddress, num_trbs); |
| if (running_total != urb->transfer_buffer_length) |
| dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length, " |
| "queued %#x (%d), asked for %#x (%d)\n", |
| __func__, |
| urb->ep->desc.bEndpointAddress, |
| running_total, running_total, |
| urb->transfer_buffer_length, |
| urb->transfer_buffer_length); |
| } |
| |
| static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id, |
| unsigned int ep_index, unsigned int stream_id, int start_cycle, |
| struct xhci_generic_trb *start_trb) |
| { |
| /* |
| * Pass all the TRBs to the hardware at once and make sure this write |
| * isn't reordered. |
| */ |
| wmb(); |
| if (start_cycle) |
| start_trb->field[3] |= cpu_to_le32(start_cycle); |
| else |
| start_trb->field[3] &= cpu_to_le32(~TRB_CYCLE); |
| xhci_ring_ep_doorbell(xhci, slot_id, ep_index, stream_id); |
| } |
| |
| /* |
| * xHCI uses normal TRBs for both bulk and interrupt. When the interrupt |
| * endpoint is to be serviced, the xHC will consume (at most) one TD. A TD |
| * (comprised of sg list entries) can take several service intervals to |
| * transmit. |
| */ |
| int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
| struct urb *urb, int slot_id, unsigned int ep_index) |
| { |
| struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, |
| xhci->devs[slot_id]->out_ctx, ep_index); |
| int xhci_interval; |
| int ep_interval; |
| |
| xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx->ep_info)); |
| ep_interval = urb->interval; |
| /* Convert to microframes */ |
| if (urb->dev->speed == USB_SPEED_LOW || |
| urb->dev->speed == USB_SPEED_FULL) |
| ep_interval *= 8; |
| /* FIXME change this to a warning and a suggestion to use the new API |
| * to set the polling interval (once the API is added). |
| */ |
| if (xhci_interval != ep_interval) { |
| dev_dbg_ratelimited(&urb->dev->dev, |
| "Driver uses different interval (%d microframe%s) than xHCI (%d microframe%s)\n", |
| ep_interval, ep_interval == 1 ? "" : "s", |
| xhci_interval, xhci_interval == 1 ? "" : "s"); |
| urb->interval = xhci_interval; |
| /* Convert back to frames for LS/FS devices */ |
| if (urb->dev->speed == USB_SPEED_LOW || |
| urb->dev->speed == USB_SPEED_FULL) |
| urb->interval /= 8; |
| } |
| return xhci_queue_bulk_tx(xhci, mem_flags, urb, slot_id, ep_index); |
| } |
| |
| /* |
| * The TD size is the number of bytes remaining in the TD (including this TRB), |
| * right shifted by 10. |
| * It must fit in bits 21:17, so it can't be bigger than 31. |
| */ |
| static u32 xhci_td_remainder(unsigned int remainder) |
| { |
| u32 max = (1 << (21 - 17 + 1)) - 1; |
| |
| if ((remainder >> 10) >= max) |
| return max << 17; |
| else |
| return (remainder >> 10) << 17; |
| } |
| |
| /* |
| * For xHCI 1.0 host controllers, TD size is the number of max packet sized |
| * packets remaining in the TD (*not* including this TRB). |
| * |
| * Total TD packet count = total_packet_count = |
| * DIV_ROUND_UP(TD size in bytes / wMaxPacketSize) |
| * |
| * Packets transferred up to and including this TRB = packets_transferred = |
| * rounddown(total bytes transferred including this TRB / wMaxPacketSize) |
| * |
| * TD size = total_packet_count - packets_transferred |
| * |
| * It must fit in bits 21:17, so it can't be bigger than 31. |
| * The last TRB in a TD must have the TD size set to zero. |
| */ |
| static u32 xhci_v1_0_td_remainder(int running_total, int trb_buff_len, |
| unsigned int total_packet_count, struct urb *urb, |
| unsigned int num_trbs_left) |
| { |
| int packets_transferred; |
| |
| /* One TRB with a zero-length data packet. */ |
| if (num_trbs_left == 0 || (running_total == 0 && trb_buff_len == 0)) |
| return 0; |
| |
| /* All the TRB queueing functions don't count the current TRB in |
| * running_total. |
| */ |
| packets_transferred = (running_total + trb_buff_len) / |
| GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc)); |
| |
| if ((total_packet_count - packets_transferred) > 31) |
| return 31 << 17; |
| return (total_packet_count - packets_transferred) << 17; |
| } |
| |
| static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
| struct urb *urb, int slot_id, unsigned int ep_index) |
| { |
| struct xhci_ring *ep_ring; |
| unsigned int num_trbs; |
| struct urb_priv *urb_priv; |
| struct xhci_td *td; |
| struct scatterlist *sg; |
| int num_sgs; |
| int trb_buff_len, this_sg_len, running_total; |
| unsigned int total_packet_count; |
| bool first_trb; |
| u64 addr; |
| bool more_trbs_coming; |
| |
| struct xhci_generic_trb *start_trb; |
| int start_cycle; |
| |
| ep_ring = xhci_urb_to_transfer_ring(xhci, urb); |
| if (!ep_ring) |
| return -EINVAL; |
| |
| num_trbs = count_sg_trbs_needed(xhci, urb); |
| num_sgs = urb->num_mapped_sgs; |
| total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length, |
| usb_endpoint_maxp(&urb->ep->desc)); |
| |
| trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id], |
| ep_index, urb->stream_id, |
| num_trbs, urb, 0, mem_flags); |
| if (trb_buff_len < 0) |
| return trb_buff_len; |
| |
| urb_priv = urb->hcpriv; |
| td = urb_priv->td[0]; |
| |
| /* |
| * Don't give the first TRB to the hardware (by toggling the cycle bit) |
| * until we've finished creating all the other TRBs. The ring's cycle |
| * state may change as we enqueue the other TRBs, so save it too. |
| */ |
| start_trb = &ep_ring->enqueue->generic; |
| start_cycle = ep_ring->cycle_state; |
| |
| running_total = 0; |
| /* |
| * How much data is in the first TRB? |
| * |
| * There are three forces at work for TRB buffer pointers and lengths: |
| * 1. We don't want to walk off the end of this sg-list entry buffer. |
| * 2. The transfer length that the driver requested may be smaller than |
| * the amount of memory allocated for this scatter-gather list. |
| * 3. TRBs buffers can't cross 64KB boundaries. |
| */ |
| sg = urb->sg; |
| addr = (u64) sg_dma_address(sg); |
| this_sg_len = sg_dma_len(sg); |
| trb_buff_len = TRB_MAX_BUFF_SIZE - (addr & (TRB_MAX_BUFF_SIZE - 1)); |
| trb_buff_len = min_t(int, trb_buff_len, this_sg_len); |
| if (trb_buff_len > urb->transfer_buffer_length) |
| trb_buff_len = urb->transfer_buffer_length; |
| |
| first_trb = true; |
| /* Queue the first TRB, even if it's zero-length */ |
| do { |
| u32 field = 0; |
| u32 length_field = 0; |
| u32 remainder = 0; |
| |
| /* Don't change the cycle bit of the first TRB until later */ |
| if (first_trb) { |
| first_trb = false; |
| if (start_cycle == 0) |
| field |= 0x1; |
| } else |
| field |= ep_ring->cycle_state; |
| |
| /* Chain all the TRBs together; clear the chain bit in the last |
| * TRB to indicate it's the last TRB in the chain. |
| */ |
| if (num_trbs > 1) { |
| field |= TRB_CHAIN; |
| } else { |
| /* FIXME - add check for ZERO_PACKET flag before this */ |
| td->last_trb = ep_ring->enqueue; |
| field |= TRB_IOC; |
| } |
| |
| /* Only set interrupt on short packet for IN endpoints */ |
| if (usb_urb_dir_in(urb)) |
| field |= TRB_ISP; |
| |
| if (TRB_MAX_BUFF_SIZE - |
| (addr & (TRB_MAX_BUFF_SIZE - 1)) < trb_buff_len) { |
| xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB boundaries!\n"); |
| xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n", |
| (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1), |
| (unsigned int) addr + trb_buff_len); |
| } |
| |
| /* Set the TRB length, TD size, and interrupter fields. */ |
| if (xhci->hci_version < 0x100) { |
| remainder = xhci_td_remainder( |
| urb->transfer_buffer_length - |
| running_total); |
| } else { |
| remainder = xhci_v1_0_td_remainder(running_total, |
| trb_buff_len, total_packet_count, urb, |
| num_trbs - 1); |
| } |
| length_field = TRB_LEN(trb_buff_len) | |
| remainder | |
| TRB_INTR_TARGET(0); |
| |
| if (num_trbs > 1) |
| more_trbs_coming = true; |
| else |
| more_trbs_coming = false; |
| queue_trb(xhci, ep_ring, more_trbs_coming, |
| lower_32_bits(addr), |
| upper_32_bits(addr), |
| length_field, |
| field | TRB_TYPE(TRB_NORMAL)); |
| --num_trbs; |
| running_total += trb_buff_len; |
| |
| /* Calculate length for next transfer -- |
| * Are we done queueing all the TRBs for this sg entry? |
| */ |
| this_sg_len -= trb_buff_len; |
| if (this_sg_len == 0) { |
| --num_sgs; |
| if (num_sgs == 0) |
| break; |
| sg = sg_next(sg); |
| addr = (u64) sg_dma_address(sg); |
| this_sg_len = sg_dma_len(sg); |
| } else { |
| addr += trb_buff_len; |
| } |
| |
| trb_buff_len = TRB_MAX_BUFF_SIZE - |
| (addr & (TRB_MAX_BUFF_SIZE - 1)); |
| trb_buff_len = min_t(int, trb_buff_len, this_sg_len); |
| if (running_total + trb_buff_len > urb->transfer_buffer_length) |
| trb_buff_len = |
| urb->transfer_buffer_length - running_total; |
| } while (running_total < urb->transfer_buffer_length); |
| |
| check_trb_math(urb, num_trbs, running_total); |
| giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id, |
| start_cycle, start_trb); |
| return 0; |
| } |
| |
| /* This is very similar to what ehci-q.c qtd_fill() does */ |
| int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
| struct urb *urb, int slot_id, unsigned int ep_index) |
| { |
| struct xhci_ring *ep_ring; |
| struct urb_priv *urb_priv; |
| struct xhci_td *td; |
| int num_trbs; |
| struct xhci_generic_trb *start_trb; |
| bool first_trb; |
| bool more_trbs_coming; |
| int start_cycle; |
| u32 field, length_field; |
| |
| int running_total, trb_buff_len, ret; |
| unsigned int total_packet_count; |
| u64 addr; |
| |
| if (urb->num_sgs) |
| return queue_bulk_sg_tx(xhci, mem_flags, urb, slot_id, ep_index); |
| |
| ep_ring = xhci_urb_to_transfer_ring(xhci, urb); |
| if (!ep_ring) |
| return -EINVAL; |
| |
| num_trbs = 0; |
| /* How much data is (potentially) left before the 64KB boundary? */ |
| running_total = TRB_MAX_BUFF_SIZE - |
| (urb->transfer_dma & (TRB_MAX_BUFF_SIZE - 1)); |
| running_total &= TRB_MAX_BUFF_SIZE - 1; |
| |
| /* If there's some data on this 64KB chunk, or we have to send a |
| * zero-length transfer, we need at least one TRB |
| */ |
| if (running_total != 0 || urb->transfer_buffer_length == 0) |
| num_trbs++; |
| /* How many more 64KB chunks to transfer, how many more TRBs? */ |
| while (running_total < urb->transfer_buffer_length) { |
| num_trbs++; |
| running_total += TRB_MAX_BUFF_SIZE; |
| } |
| /* FIXME: this doesn't deal with URB_ZERO_PACKET - need one more */ |
| |
| ret = prepare_transfer(xhci, xhci->devs[slot_id], |
| ep_index, urb->stream_id, |
| num_trbs, urb, 0, mem_flags); |
| if (ret < 0) |
| return ret; |
| |
| urb_priv = urb->hcpriv; |
| td = urb_priv->td[0]; |
| |
| /* |
| * Don't give the first TRB to the hardware (by toggling the cycle bit) |
| * until we've finished creating all the other TRBs. The ring's cycle |
| * state may change as we enqueue the other TRBs, so save it too. |
| */ |
| start_trb = &ep_ring->enqueue->generic; |
| start_cycle = ep_ring->cycle_state; |
| |
| running_total = 0; |
| total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length, |
| usb_endpoint_maxp(&urb->ep->desc)); |
| /* How much data is in the first TRB? */ |
| addr = (u64) urb->transfer_dma; |
| trb_buff_len = TRB_MAX_BUFF_SIZE - |
| (urb->transfer_dma & (TRB_MAX_BUFF_SIZE - 1)); |
| if (trb_buff_len > urb->transfer_buffer_length) |
| trb_buff_len = urb->transfer_buffer_length; |
| |
| first_trb = true; |
| |
| /* Queue the first TRB, even if it's zero-length */ |
| do { |
| u32 remainder = 0; |
| field = 0; |
| |
| /* Don't change the cycle bit of the first TRB until later */ |
| if (first_trb) { |
| first_trb = false; |
| if (start_cycle == 0) |
| field |= 0x1; |
| } else |
| field |= ep_ring->cycle_state; |
| |
| /* Chain all the TRBs together; clear the chain bit in the last |
| * TRB to indicate it's the last TRB in the chain. |
| */ |
| if (num_trbs > 1) { |
| field |= TRB_CHAIN; |
| } else { |
| /* FIXME - add check for ZERO_PACKET flag before this */ |
| td->last_trb = ep_ring->enqueue; |
| field |= TRB_IOC; |
| } |
| |
| /* Only set interrupt on short packet for IN endpoints */ |
| if (usb_urb_dir_in(urb)) |
| field |= TRB_ISP; |
| |
| /* Set the TRB length, TD size, and interrupter fields. */ |
| if (xhci->hci_version < 0x100) { |
| remainder = xhci_td_remainder( |
| urb->transfer_buffer_length - |
| running_total); |
| } else { |
| remainder = xhci_v1_0_td_remainder(running_total, |
| trb_buff_len, total_packet_count, urb, |
| num_trbs - 1); |
| } |
| length_field = TRB_LEN(trb_buff_len) | |
| remainder | |
| TRB_INTR_TARGET(0); |
| |
| if (num_trbs > 1) |
| more_trbs_coming = true; |
| else |
| more_trbs_coming = false; |
| queue_trb(xhci, ep_ring, more_trbs_coming, |
| lower_32_bits(addr), |
| upper_32_bits(addr), |
| length_field, |
| field | TRB_TYPE(TRB_NORMAL)); |
| --num_trbs; |
| running_total += trb_buff_len; |
| |
| /* Calculate length for next transfer */ |
| addr += trb_buff_len; |
| trb_buff_len = urb->transfer_buffer_length - running_total; |
| if (trb_buff_len > TRB_MAX_BUFF_SIZE) |
| trb_buff_len = TRB_MAX_BUFF_SIZE; |
| } while (running_total < urb->transfer_buffer_length); |
| |
| check_trb_math(urb, num_trbs, running_total); |
| giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id, |
| start_cycle, start_trb); |
| return 0; |
| } |
| |
| /* Caller must have locked xhci->lock */ |
| int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
| struct urb *urb, int slot_id, unsigned int ep_index) |
| { |
| struct xhci_ring *ep_ring; |
| int num_trbs; |
| int ret; |
| struct usb_ctrlrequest *setup; |
| struct xhci_generic_trb *start_trb; |
| int start_cycle; |
| u32 field, length_field; |
| struct urb_priv *urb_priv; |
| struct xhci_td *td; |
| |
| ep_ring = xhci_urb_to_transfer_ring(xhci, urb); |
| if (!ep_ring) |
| return -EINVAL; |
| |
| /* |
| * Need to copy setup packet into setup TRB, so we can't use the setup |
| * DMA address. |
| */ |
| if (!urb->setup_packet) |
| return -EINVAL; |
| |
| /* 1 TRB for setup, 1 for status */ |
| num_trbs = 2; |
| /* |
| * Don't need to check if we need additional event data and normal TRBs, |
| * since data in control transfers will never get bigger than 16MB |
| * XXX: can we get a buffer that crosses 64KB boundaries? |
| */ |
| if (urb->transfer_buffer_length > 0) |
| num_trbs++; |
| ret = prepare_transfer(xhci, xhci->devs[slot_id], |
| ep_index, urb->stream_id, |
| num_trbs, urb, 0, mem_flags); |
| if (ret < 0) |
| return ret; |
| |
| urb_priv = urb->hcpriv; |
| td = urb_priv->td[0]; |
| |
| /* |
| * Don't give the first TRB to the hardware (by toggling the cycle bit) |
| * until we've finished creating all the other TRBs. The ring's cycle |
| * state may change as we enqueue the other TRBs, so save it too. |
| */ |
| start_trb = &ep_ring->enqueue->generic; |
| start_cycle = ep_ring->cycle_state; |
| |
| /* Queue setup TRB - see section 6.4.1.2.1 */ |
| /* FIXME better way to translate setup_packet into two u32 fields? */ |
| setup = (struct usb_ctrlrequest *) urb->setup_packet; |
| field = 0; |
| field |= TRB_IDT | TRB_TYPE(TRB_SETUP); |
| if (start_cycle == 0) |
| field |= 0x1; |
| |
| /* xHCI 1.0 6.4.1.2.1: Transfer Type field */ |
| if (xhci->hci_version == 0x100) { |
| if (urb->transfer_buffer_length > 0) { |
| if (setup->bRequestType & USB_DIR_IN) |
| field |= TRB_TX_TYPE(TRB_DATA_IN); |
| else |
| field |= TRB_TX_TYPE(TRB_DATA_OUT); |
| } |
| } |
| |
| queue_trb(xhci, ep_ring, true, |
| setup->bRequestType | setup->bRequest << 8 | le16_to_cpu(setup->wValue) << 16, |
| le16_to_cpu(setup->wIndex) | le16_to_cpu(setup->wLength) << 16, |
| TRB_LEN(8) | TRB_INTR_TARGET(0), |
| /* Immediate data in pointer */ |
| field); |
| |
| /* If there's data, queue data TRBs */ |
| /* Only set interrupt on short packet for IN endpoints */ |
| if (usb_urb_dir_in(urb)) |
| field = TRB_ISP | TRB_TYPE(TRB_DATA); |
| else |
| field = TRB_TYPE(TRB_DATA); |
| |
| length_field = TRB_LEN(urb->transfer_buffer_length) | |
| xhci_td_remainder(urb->transfer_buffer_length) | |
| TRB_INTR_TARGET(0); |
| if (urb->transfer_buffer_length > 0) { |
| if (setup->bRequestType & USB_DIR_IN) |
| field |= TRB_DIR_IN; |
| queue_trb(xhci, ep_ring, true, |
| lower_32_bits(urb->transfer_dma), |
| upper_32_bits(urb->transfer_dma), |
| length_field, |
| field | ep_ring->cycle_state); |
| } |
| |
| /* Save the DMA address of the last TRB in the TD */ |
| td->last_trb = ep_ring->enqueue; |
| |
| /* Queue status TRB - see Table 7 and sections 4.11.2.2 and 6.4.1.2.3 */ |
| /* If the device sent data, the status stage is an OUT transfer */ |
| if (urb->transfer_buffer_length > 0 && setup->bRequestType & USB_DIR_IN) |
| field = 0; |
| else |
| field = TRB_DIR_IN; |
| queue_trb(xhci, ep_ring, false, |
| 0, |
| 0, |
| TRB_INTR_TARGET(0), |
| /* Event on completion */ |
| field | TRB_IOC | TRB_TYPE(TRB_STATUS) | ep_ring->cycle_state); |
| |
| giveback_first_trb(xhci, slot_id, ep_index, 0, |
| start_cycle, start_trb); |
| return 0; |
| } |
| |
| static int count_isoc_trbs_needed(struct xhci_hcd *xhci, |
| struct urb *urb, int i) |
| { |
| int num_trbs = 0; |
| u64 addr, td_len; |
| |
| addr = (u64) (urb->transfer_dma + urb->iso_frame_desc[i].offset); |
| td_len = urb->iso_frame_desc[i].length; |
| |
| num_trbs = DIV_ROUND_UP(td_len + (addr & (TRB_MAX_BUFF_SIZE - 1)), |
| TRB_MAX_BUFF_SIZE); |
| if (num_trbs == 0) |
| num_trbs++; |
| |
| return num_trbs; |
| } |
| |
| /* |
| * The transfer burst count field of the isochronous TRB defines the number of |
| * bursts that are required to move all packets in this TD. Only SuperSpeed |
| * devices can burst up to bMaxBurst number of packets per service interval. |
| * This field is zero based, meaning a value of zero in the field means one |
| * burst. Basically, for everything but SuperSpeed devices, this field will be |
| * zero. Only xHCI 1.0 host controllers support this field. |
| */ |
| static unsigned int xhci_get_burst_count(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct urb *urb, unsigned int total_packet_count) |
| { |
| unsigned int max_burst; |
| |
| if (xhci->hci_version < 0x100 || udev->speed != USB_SPEED_SUPER) |
| return 0; |
| |
| max_burst = urb->ep->ss_ep_comp.bMaxBurst; |
| return DIV_ROUND_UP(total_packet_count, max_burst + 1) - 1; |
| } |
| |
| /* |
| * Returns the number of packets in the last "burst" of packets. This field is |
| * valid for all speeds of devices. USB 2.0 devices can only do one "burst", so |
| * the last burst packet count is equal to the total number of packets in the |
| * TD. SuperSpeed endpoints can have up to 3 bursts. All but the last burst |
| * must contain (bMaxBurst + 1) number of packets, but the last burst can |
| * contain 1 to (bMaxBurst + 1) packets. |
| */ |
| static unsigned int xhci_get_last_burst_packet_count(struct xhci_hcd *xhci, |
| struct usb_device *udev, |
| struct urb *urb, unsigned int total_packet_count) |
| { |
| unsigned int max_burst; |
| unsigned int residue; |
| |
| if (xhci->hci_version < 0x100) |
| return 0; |
| |
| switch (udev->speed) { |
| case USB_SPEED_SUPER: |
| /* bMaxBurst is zero based: 0 means 1 packet per burst */ |
| max_burst = urb->ep->ss_ep_comp.bMaxBurst; |
| residue = total_packet_count % (max_burst + 1); |
| /* If residue is zero, the last burst contains (max_burst + 1) |
| * number of packets, but the TLBPC field is zero-based. |
| */ |
| if (residue == 0) |
| return max_burst; |
| return residue - 1; |
| default: |
| if (total_packet_count == 0) |
| return 0; |
| return total_packet_count - 1; |
| } |
| } |
| |
| /* This is for isoc transfer */ |
| static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
| struct urb *urb, int slot_id, unsigned int ep_index) |
| { |
| struct xhci_ring *ep_ring; |
| struct urb_priv *urb_priv; |
| struct xhci_td *td; |
| int num_tds, trbs_per_td; |
| struct xhci_generic_trb *start_trb; |
| bool first_trb; |
| int start_cycle; |
| u32 field, length_field; |
| int running_total, trb_buff_len, td_len, td_remain_len, ret; |
| u64 start_addr, addr; |
| int i, j; |
| bool more_trbs_coming; |
| |
| ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; |
| |
| num_tds = urb->number_of_packets; |
| if (num_tds < 1) { |
| xhci_dbg(xhci, "Isoc URB with zero packets?\n"); |
| return -EINVAL; |
| } |
| |
| start_addr = (u64) urb->transfer_dma; |
| start_trb = &ep_ring->enqueue->generic; |
| start_cycle = ep_ring->cycle_state; |
| |
| urb_priv = urb->hcpriv; |
| /* Queue the first TRB, even if it's zero-length */ |
| for (i = 0; i < num_tds; i++) { |
| unsigned int total_packet_count; |
| unsigned int burst_count; |
| unsigned int residue; |
| |
| first_trb = true; |
| running_total = 0; |
| addr = start_addr + urb->iso_frame_desc[i].offset; |
| td_len = urb->iso_frame_desc[i].length; |
| td_remain_len = td_len; |
| total_packet_count = DIV_ROUND_UP(td_len, |
| GET_MAX_PACKET( |
| usb_endpoint_maxp(&urb->ep->desc))); |
| /* A zero-length transfer still involves at least one packet. */ |
| if (total_packet_count == 0) |
| total_packet_count++; |
| burst_count = xhci_get_burst_count(xhci, urb->dev, urb, |
| total_packet_count); |
| residue = xhci_get_last_burst_packet_count(xhci, |
| urb->dev, urb, total_packet_count); |
| |
| trbs_per_td = count_isoc_trbs_needed(xhci, urb, i); |
| |
| ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, |
| urb->stream_id, trbs_per_td, urb, i, mem_flags); |
| if (ret < 0) { |
| if (i == 0) |
| return ret; |
| goto cleanup; |
| } |
| |
| td = urb_priv->td[i]; |
| for (j = 0; j < trbs_per_td; j++) { |
| u32 remainder = 0; |
| field = 0; |
| |
| if (first_trb) { |
| field = TRB_TBC(burst_count) | |
| TRB_TLBPC(residue); |
| /* Queue the isoc TRB */ |
| field |= TRB_TYPE(TRB_ISOC); |
| /* Assume URB_ISO_ASAP is set */ |
| field |= TRB_SIA; |
| if (i == 0) { |
| if (start_cycle == 0) |
| field |= 0x1; |
| } else |
| field |= ep_ring->cycle_state; |
| first_trb = false; |
| } else { |
| /* Queue other normal TRBs */ |
| field |= TRB_TYPE(TRB_NORMAL); |
| field |= ep_ring->cycle_state; |
| } |
| |
| /* Only set interrupt on short packet for IN EPs */ |
| if (usb_urb_dir_in(urb)) |
| field |= TRB_ISP; |
| |
| /* Chain all the TRBs together; clear the chain bit in |
| * the last TRB to indicate it's the last TRB in the |
| * chain. |
| */ |
| if (j < trbs_per_td - 1) { |
| field |= TRB_CHAIN; |
| more_trbs_coming = true; |
| } else { |
| td->last_trb = ep_ring->enqueue; |
| field |= TRB_IOC; |
| if (xhci->hci_version == 0x100 && |
| !(xhci->quirks & |
| XHCI_AVOID_BEI)) { |
| /* Set BEI bit except for the last td */ |
| if (i < num_tds - 1) |
| field |= TRB_BEI; |
| } |
| more_trbs_coming = false; |
| } |
| |
| /* Calculate TRB length */ |
| trb_buff_len = TRB_MAX_BUFF_SIZE - |
| (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); |
| if (trb_buff_len > td_remain_len) |
| trb_buff_len = td_remain_len; |
| |
| /* Set the TRB length, TD size, & interrupter fields. */ |
| if (xhci->hci_version < 0x100) { |
| remainder = xhci_td_remainder( |
| td_len - running_total); |
| } else { |
| remainder = xhci_v1_0_td_remainder( |
| running_total, trb_buff_len, |
| total_packet_count, urb, |
| (trbs_per_td - j - 1)); |
| } |
| length_field = TRB_LEN(trb_buff_len) | |
| remainder | |
| TRB_INTR_TARGET(0); |
| |
| queue_trb(xhci, ep_ring, more_trbs_coming, |
| lower_32_bits(addr), |
| upper_32_bits(addr), |
| length_field, |
| field); |
| running_total += trb_buff_len; |
| |
| addr += trb_buff_len; |
| td_remain_len -= trb_buff_len; |
| } |
| |
| /* Check TD length */ |
| if (running_total != td_len) { |
| xhci_err(xhci, "ISOC TD length unmatch\n"); |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| } |
| |
| if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) { |
| if (xhci->quirks & XHCI_AMD_PLL_FIX) |
| usb_amd_quirk_pll_disable(); |
| } |
| xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs++; |
| |
| giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id, |
| start_cycle, start_trb); |
| return 0; |
| cleanup: |
| /* Clean up a partially enqueued isoc transfer. */ |
| |
| for (i--; i >= 0; i--) |
| list_del_init(&urb_priv->td[i]->td_list); |
| |
| /* Use the first TD as a temporary variable to turn the TDs we've queued |
| * into No-ops with a software-owned cycle bit. That way the hardware |
| * won't accidentally start executing bogus TDs when we partially |
| * overwrite them. td->first_trb and td->start_seg are already set. |
| */ |
| urb_priv->td[0]->last_trb = ep_ring->enqueue; |
| /* Every TRB except the first & last will have its cycle bit flipped. */ |
| td_to_noop(xhci, ep_ring, urb_priv->td[0], true); |
| |
| /* Reset the ring enqueue back to the first TRB and its cycle bit. */ |
| ep_ring->enqueue = urb_priv->td[0]->first_trb; |
| ep_ring->enq_seg = urb_priv->td[0]->start_seg; |
| ep_ring->cycle_state = start_cycle; |
| ep_ring->num_trbs_free = ep_ring->num_trbs_free_temp; |
| usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb); |
| return ret; |
| } |
| |
| /* |
| * Check transfer ring to guarantee there is enough room for the urb. |
| * Update ISO URB start_frame and interval. |
| * Update interval as xhci_queue_intr_tx does. Just use xhci frame_index to |
| * update the urb->start_frame by now. |
| * Always assume URB_ISO_ASAP set, and NEVER use urb->start_frame as input. |
| */ |
| int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags, |
| struct urb *urb, int slot_id, unsigned int ep_index) |
| { |
| struct xhci_virt_device *xdev; |
| struct xhci_ring *ep_ring; |
| struct xhci_ep_ctx *ep_ctx; |
| int start_frame; |
| int xhci_interval; |
| int ep_interval; |
| int num_tds, num_trbs, i; |
| int ret; |
| |
| xdev = xhci->devs[slot_id]; |
| ep_ring = xdev->eps[ep_index].ring; |
| ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
| |
| num_trbs = 0; |
| num_tds = urb->number_of_packets; |
| for (i = 0; i < num_tds; i++) |
| num_trbs += count_isoc_trbs_needed(xhci, urb, i); |
| |
| /* Check the ring to guarantee there is enough room for the whole urb. |
| * Do not insert any td of the urb to the ring if the check failed. |
| */ |
| ret = prepare_ring(xhci, ep_ring, le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK, |
| num_trbs, mem_flags); |
| if (ret) |
| return ret; |
| |
| start_frame = readl(&xhci->run_regs->microframe_index); |
| start_frame &= 0x3fff; |
| |
| urb->start_frame = start_frame; |
| if (urb->dev->speed == USB_SPEED_LOW || |
| urb->dev->speed == USB_SPEED_FULL) |
| urb->start_frame >>= 3; |
| |
| xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx->ep_info)); |
| ep_interval = urb->interval; |
| /* Convert to microframes */ |
| if (urb->dev->speed == USB_SPEED_LOW || |
| urb->dev->speed == USB_SPEED_FULL) |
| ep_interval *= 8; |
| /* FIXME change this to a warning and a suggestion to use the new API |
| * to set the polling interval (once the API is added). |
| */ |
| if (xhci_interval != ep_interval) { |
| dev_dbg_ratelimited(&urb->dev->dev, |
| "Driver uses different interval (%d microframe%s) than xHCI (%d microframe%s)\n", |
| ep_interval, ep_interval == 1 ? "" : "s", |
| xhci_interval, xhci_interval == 1 ? "" : "s"); |
| urb->interval = xhci_interval; |
| /* Convert back to frames for LS/FS devices */ |
| if (urb->dev->speed == USB_SPEED_LOW || |
| urb->dev->speed == USB_SPEED_FULL) |
| urb->interval /= 8; |
| } |
| ep_ring->num_trbs_free_temp = ep_ring->num_trbs_free; |
| |
| return xhci_queue_isoc_tx(xhci, mem_flags, urb, slot_id, ep_index); |
| } |
| |
| /**** Command Ring Operations ****/ |
| |
| /* Generic function for queueing a command TRB on the command ring. |
| * Check to make sure there's room on the command ring for one command TRB. |
| * Also check that there's room reserved for commands that must not fail. |
| * If this is a command that must not fail, meaning command_must_succeed = TRUE, |
| * then only check for the number of reserved spots. |
| * Don't decrement xhci->cmd_ring_reserved_trbs after we've queued the TRB |
| * because the command event handler may want to resubmit a failed command. |
| */ |
| static int queue_command(struct xhci_hcd *xhci, struct xhci_command *cmd, |
| u32 field1, u32 field2, |
| u32 field3, u32 field4, bool command_must_succeed) |
| { |
| int reserved_trbs = xhci->cmd_ring_reserved_trbs; |
| int ret; |
| if (xhci->xhc_state & XHCI_STATE_DYING) |
| return -ESHUTDOWN; |
| |
| if (!command_must_succeed) |
| reserved_trbs++; |
| |
| ret = prepare_ring(xhci, xhci->cmd_ring, EP_STATE_RUNNING, |
| reserved_trbs, GFP_ATOMIC); |
| if (ret < 0) { |
| xhci_err(xhci, "ERR: No room for command on command ring\n"); |
| if (command_must_succeed) |
| xhci_err(xhci, "ERR: Reserved TRB counting for " |
| "unfailable commands failed.\n"); |
| return ret; |
| } |
| |
| cmd->command_trb = xhci->cmd_ring->enqueue; |
| list_add_tail(&cmd->cmd_list, &xhci->cmd_list); |
| |
| /* if there are no other commands queued we start the timeout timer */ |
| if (xhci->cmd_list.next == &cmd->cmd_list && |
| !timer_pending(&xhci->cmd_timer)) { |
| xhci->current_cmd = cmd; |
| mod_timer(&xhci->cmd_timer, jiffies + XHCI_CMD_DEFAULT_TIMEOUT); |
| } |
| |
| queue_trb(xhci, xhci->cmd_ring, false, field1, field2, field3, |
| field4 | xhci->cmd_ring->cycle_state); |
| return 0; |
| } |
| |
| /* Queue a slot enable or disable request on the command ring */ |
| int xhci_queue_slot_control(struct xhci_hcd *xhci, struct xhci_command *cmd, |
| u32 trb_type, u32 slot_id) |
| { |
| return queue_command(xhci, cmd, 0, 0, 0, |
| TRB_TYPE(trb_type) | SLOT_ID_FOR_TRB(slot_id), false); |
| } |
| |
| /* Queue an address device command TRB */ |
| int xhci_queue_address_device(struct xhci_hcd *xhci, struct xhci_command *cmd, |
| dma_addr_t in_ctx_ptr, u32 slot_id, enum xhci_setup_dev setup) |
| { |
| return queue_command(xhci, cmd, lower_32_bits(in_ctx_ptr), |
| upper_32_bits(in_ctx_ptr), 0, |
| TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id) |
| | (setup == SETUP_CONTEXT_ONLY ? TRB_BSR : 0), false); |
| } |
| |
| int xhci_queue_vendor_command(struct xhci_hcd *xhci, struct xhci_command *cmd, |
| u32 field1, u32 field2, u32 field3, u32 field4) |
| { |
| return queue_command(xhci, cmd, field1, field2, field3, field4, false); |
| } |
| |
| /* Queue a reset device command TRB */ |
| int xhci_queue_reset_device(struct xhci_hcd *xhci, struct xhci_command *cmd, |
| u32 slot_id) |
| { |
| return queue_command(xhci, cmd, 0, 0, 0, |
| TRB_TYPE(TRB_RESET_DEV) | SLOT_ID_FOR_TRB(slot_id), |
| false); |
| } |
| |
| /* Queue a configure endpoint command TRB */ |
| int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, |
| struct xhci_command *cmd, dma_addr_t in_ctx_ptr, |
| u32 slot_id, bool command_must_succeed) |
| { |
| return queue_command(xhci, cmd, lower_32_bits(in_ctx_ptr), |
| upper_32_bits(in_ctx_ptr), 0, |
| TRB_TYPE(TRB_CONFIG_EP) | SLOT_ID_FOR_TRB(slot_id), |
| command_must_succeed); |
| } |
| |
| /* Queue an evaluate context command TRB */ |
| int xhci_queue_evaluate_context(struct xhci_hcd *xhci, struct xhci_command *cmd, |
| dma_addr_t in_ctx_ptr, u32 slot_id, bool command_must_succeed) |
| { |
| return queue_command(xhci, cmd, lower_32_bits(in_ctx_ptr), |
| upper_32_bits(in_ctx_ptr), 0, |
| TRB_TYPE(TRB_EVAL_CONTEXT) | SLOT_ID_FOR_TRB(slot_id), |
| command_must_succeed); |
| } |
| |
| /* |
| * Suspend is set to indicate "Stop Endpoint Command" is being issued to stop |
| * activity on an endpoint that is about to be suspended. |
| */ |
| int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, struct xhci_command *cmd, |
| int slot_id, unsigned int ep_index, int suspend) |
| { |
| u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); |
| u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); |
| u32 type = TRB_TYPE(TRB_STOP_RING); |
| u32 trb_suspend = SUSPEND_PORT_FOR_TRB(suspend); |
| |
| return queue_command(xhci, cmd, 0, 0, 0, |
| trb_slot_id | trb_ep_index | type | trb_suspend, false); |
| } |
| |
| /* Set Transfer Ring Dequeue Pointer command */ |
| void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci, |
| unsigned int slot_id, unsigned int ep_index, |
| unsigned int stream_id, |
| struct xhci_dequeue_state *deq_state) |
| { |
| dma_addr_t addr; |
| u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); |
| u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); |
| u32 trb_stream_id = STREAM_ID_FOR_TRB(stream_id); |
| u32 trb_sct = 0; |
| u32 type = TRB_TYPE(TRB_SET_DEQ); |
| struct xhci_virt_ep *ep; |
| struct xhci_command *cmd; |
| int ret; |
| |
| xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb, |
| "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), new deq ptr = %p (0x%llx dma), new cycle = %u", |
| deq_state->new_deq_seg, |
| (unsigned long long)deq_state->new_deq_seg->dma, |
| deq_state->new_deq_ptr, |
| (unsigned long long)xhci_trb_virt_to_dma( |
| deq_state->new_deq_seg, deq_state->new_deq_ptr), |
| deq_state->new_cycle_state); |
| |
| addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg, |
| deq_state->new_deq_ptr); |
| if (addr == 0) { |
| xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n"); |
| xhci_warn(xhci, "WARN deq seg = %p, deq pt = %p\n", |
| deq_state->new_deq_seg, deq_state->new_deq_ptr); |
| return; |
| } |
| ep = &xhci->devs[slot_id]->eps[ep_index]; |
| if ((ep->ep_state & SET_DEQ_PENDING)) { |
| xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n"); |
| xhci_warn(xhci, "A Set TR Deq Ptr command is pending.\n"); |
| return; |
| } |
| |
| /* This function gets called from contexts where it cannot sleep */ |
| cmd = xhci_alloc_command(xhci, false, false, GFP_ATOMIC); |
| if (!cmd) { |
| xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr: ENOMEM\n"); |
| return; |
| } |
| |
| ep->queued_deq_seg = deq_state->new_deq_seg; |
| ep->queued_deq_ptr = deq_state->new_deq_ptr; |
| if (stream_id) |
| trb_sct = SCT_FOR_TRB(SCT_PRI_TR); |
| ret = queue_command(xhci, cmd, |
| lower_32_bits(addr) | trb_sct | deq_state->new_cycle_state, |
| upper_32_bits(addr), trb_stream_id, |
| trb_slot_id | trb_ep_index | type, false); |
| if (ret < 0) { |
| xhci_free_command(xhci, cmd); |
| return; |
| } |
| |
| /* Stop the TD queueing code from ringing the doorbell until |
| * this command completes. The HC won't set the dequeue pointer |
| * if the ring is running, and ringing the doorbell starts the |
| * ring running. |
| */ |
| ep->ep_state |= SET_DEQ_PENDING; |
| } |
| |
| int xhci_queue_reset_ep(struct xhci_hcd *xhci, struct xhci_command *cmd, |
| int slot_id, unsigned int ep_index) |
| { |
| u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); |
| u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); |
| u32 type = TRB_TYPE(TRB_RESET_EP); |
| |
| return queue_command(xhci, cmd, 0, 0, 0, |
| trb_slot_id | trb_ep_index | type, false); |
| } |