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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7fec3253ed
Remove redundant print messages in the interrupt context. Signed-off-by: Andiry Xu <andiry.xu@amd.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2584 lines
81 KiB
C
2584 lines
81 KiB
C
/*
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* xHCI host controller driver
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*
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* Copyright (C) 2008 Intel Corp.
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*
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* Author: Sarah Sharp
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* Some code borrowed from the Linux EHCI driver.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* Ring initialization rules:
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* 1. Each segment is initialized to zero, except for link TRBs.
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* 2. Ring cycle state = 0. This represents Producer Cycle State (PCS) or
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* Consumer Cycle State (CCS), depending on ring function.
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* 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment.
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*
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* Ring behavior rules:
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* 1. A ring is empty if enqueue == dequeue. This means there will always be at
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* least one free TRB in the ring. This is useful if you want to turn that
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* into a link TRB and expand the ring.
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* 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a
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* link TRB, then load the pointer with the address in the link TRB. If the
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* link TRB had its toggle bit set, you may need to update the ring cycle
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* state (see cycle bit rules). You may have to do this multiple times
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* until you reach a non-link TRB.
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* 3. A ring is full if enqueue++ (for the definition of increment above)
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* equals the dequeue pointer.
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*
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* Cycle bit rules:
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* 1. When a consumer increments a dequeue pointer and encounters a toggle bit
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* in a link TRB, it must toggle the ring cycle state.
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* 2. When a producer increments an enqueue pointer and encounters a toggle bit
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* in a link TRB, it must toggle the ring cycle state.
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*
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* Producer rules:
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* 1. Check if ring is full before you enqueue.
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* 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing.
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* Update enqueue pointer between each write (which may update the ring
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* cycle state).
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* 3. Notify consumer. If SW is producer, it rings the doorbell for command
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* and endpoint rings. If HC is the producer for the event ring,
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* and it generates an interrupt according to interrupt modulation rules.
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*
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* Consumer rules:
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* 1. Check if TRB belongs to you. If the cycle bit == your ring cycle state,
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* the TRB is owned by the consumer.
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* 2. Update dequeue pointer (which may update the ring cycle state) and
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* continue processing TRBs until you reach a TRB which is not owned by you.
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* 3. Notify the producer. SW is the consumer for the event ring, and it
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* updates event ring dequeue pointer. HC is the consumer for the command and
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* endpoint rings; it generates events on the event ring for these.
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*/
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include "xhci.h"
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/*
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* Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
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* address of the TRB.
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*/
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dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg,
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union xhci_trb *trb)
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{
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unsigned long segment_offset;
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if (!seg || !trb || trb < seg->trbs)
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return 0;
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/* offset in TRBs */
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segment_offset = trb - seg->trbs;
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if (segment_offset > TRBS_PER_SEGMENT)
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return 0;
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return seg->dma + (segment_offset * sizeof(*trb));
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}
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/* Does this link TRB point to the first segment in a ring,
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* or was the previous TRB the last TRB on the last segment in the ERST?
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*/
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static inline bool last_trb_on_last_seg(struct xhci_hcd *xhci, struct xhci_ring *ring,
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struct xhci_segment *seg, union xhci_trb *trb)
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{
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if (ring == xhci->event_ring)
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return (trb == &seg->trbs[TRBS_PER_SEGMENT]) &&
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(seg->next == xhci->event_ring->first_seg);
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else
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return trb->link.control & LINK_TOGGLE;
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}
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/* Is this TRB a link TRB or was the last TRB the last TRB in this event ring
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* segment? I.e. would the updated event TRB pointer step off the end of the
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* event seg?
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*/
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static inline int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
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struct xhci_segment *seg, union xhci_trb *trb)
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{
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if (ring == xhci->event_ring)
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return trb == &seg->trbs[TRBS_PER_SEGMENT];
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else
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return (trb->link.control & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK);
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}
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static inline int enqueue_is_link_trb(struct xhci_ring *ring)
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{
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struct xhci_link_trb *link = &ring->enqueue->link;
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return ((link->control & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK));
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}
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/* Updates trb to point to the next TRB in the ring, and updates seg if the next
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* TRB is in a new segment. This does not skip over link TRBs, and it does not
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* effect the ring dequeue or enqueue pointers.
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*/
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static void next_trb(struct xhci_hcd *xhci,
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struct xhci_ring *ring,
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struct xhci_segment **seg,
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union xhci_trb **trb)
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{
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if (last_trb(xhci, ring, *seg, *trb)) {
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*seg = (*seg)->next;
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*trb = ((*seg)->trbs);
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} else {
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*trb = (*trb)++;
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}
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}
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/*
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* See Cycle bit rules. SW is the consumer for the event ring only.
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* Don't make a ring full of link TRBs. That would be dumb and this would loop.
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*/
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static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer)
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{
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union xhci_trb *next = ++(ring->dequeue);
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unsigned long long addr;
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ring->deq_updates++;
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/* Update the dequeue pointer further if that was a link TRB or we're at
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* the end of an event ring segment (which doesn't have link TRBS)
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*/
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while (last_trb(xhci, ring, ring->deq_seg, next)) {
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if (consumer && last_trb_on_last_seg(xhci, ring, ring->deq_seg, next)) {
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ring->cycle_state = (ring->cycle_state ? 0 : 1);
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if (!in_interrupt())
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xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
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ring,
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(unsigned int) ring->cycle_state);
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}
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ring->deq_seg = ring->deq_seg->next;
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ring->dequeue = ring->deq_seg->trbs;
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next = ring->dequeue;
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}
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addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
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if (ring == xhci->event_ring)
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xhci_dbg(xhci, "Event ring deq = 0x%llx (DMA)\n", addr);
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else if (ring == xhci->cmd_ring)
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xhci_dbg(xhci, "Command ring deq = 0x%llx (DMA)\n", addr);
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else
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xhci_dbg(xhci, "Ring deq = 0x%llx (DMA)\n", addr);
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}
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/*
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* See Cycle bit rules. SW is the consumer for the event ring only.
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* Don't make a ring full of link TRBs. That would be dumb and this would loop.
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*
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* If we've just enqueued a TRB that is in the middle of a TD (meaning the
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* chain bit is set), then set the chain bit in all the following link TRBs.
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* If we've enqueued the last TRB in a TD, make sure the following link TRBs
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* have their chain bit cleared (so that each Link TRB is a separate TD).
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*
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* Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit
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* set, but other sections talk about dealing with the chain bit set. This was
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* fixed in the 0.96 specification errata, but we have to assume that all 0.95
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* xHCI hardware can't handle the chain bit being cleared on a link TRB.
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*
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* @more_trbs_coming: Will you enqueue more TRBs before calling
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* prepare_transfer()?
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*/
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static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
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bool consumer, bool more_trbs_coming)
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{
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u32 chain;
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union xhci_trb *next;
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unsigned long long addr;
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chain = ring->enqueue->generic.field[3] & TRB_CHAIN;
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next = ++(ring->enqueue);
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ring->enq_updates++;
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/* Update the dequeue pointer further if that was a link TRB or we're at
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* the end of an event ring segment (which doesn't have link TRBS)
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*/
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while (last_trb(xhci, ring, ring->enq_seg, next)) {
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if (!consumer) {
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if (ring != xhci->event_ring) {
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/*
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* If the caller doesn't plan on enqueueing more
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* TDs before ringing the doorbell, then we
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* don't want to give the link TRB to the
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* hardware just yet. We'll give the link TRB
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* back in prepare_ring() just before we enqueue
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* the TD at the top of the ring.
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*/
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if (!chain && !more_trbs_coming)
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break;
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/* If we're not dealing with 0.95 hardware,
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* carry over the chain bit of the previous TRB
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* (which may mean the chain bit is cleared).
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*/
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if (!xhci_link_trb_quirk(xhci)) {
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next->link.control &= ~TRB_CHAIN;
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next->link.control |= chain;
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}
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/* Give this link TRB to the hardware */
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wmb();
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next->link.control ^= TRB_CYCLE;
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}
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/* Toggle the cycle bit after the last ring segment. */
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if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
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ring->cycle_state = (ring->cycle_state ? 0 : 1);
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if (!in_interrupt())
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xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
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ring,
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(unsigned int) ring->cycle_state);
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}
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}
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ring->enq_seg = ring->enq_seg->next;
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ring->enqueue = ring->enq_seg->trbs;
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next = ring->enqueue;
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}
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addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
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if (ring == xhci->event_ring)
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xhci_dbg(xhci, "Event ring enq = 0x%llx (DMA)\n", addr);
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else if (ring == xhci->cmd_ring)
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xhci_dbg(xhci, "Command ring enq = 0x%llx (DMA)\n", addr);
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else
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xhci_dbg(xhci, "Ring enq = 0x%llx (DMA)\n", addr);
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}
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/*
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* Check to see if there's room to enqueue num_trbs on the ring. See rules
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* above.
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* FIXME: this would be simpler and faster if we just kept track of the number
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* of free TRBs in a ring.
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*/
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static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring,
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unsigned int num_trbs)
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{
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int i;
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union xhci_trb *enq = ring->enqueue;
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struct xhci_segment *enq_seg = ring->enq_seg;
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struct xhci_segment *cur_seg;
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unsigned int left_on_ring;
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/* If we are currently pointing to a link TRB, advance the
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* enqueue pointer before checking for space */
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while (last_trb(xhci, ring, enq_seg, enq)) {
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enq_seg = enq_seg->next;
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enq = enq_seg->trbs;
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}
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/* Check if ring is empty */
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if (enq == ring->dequeue) {
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/* Can't use link trbs */
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left_on_ring = TRBS_PER_SEGMENT - 1;
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for (cur_seg = enq_seg->next; cur_seg != enq_seg;
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cur_seg = cur_seg->next)
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left_on_ring += TRBS_PER_SEGMENT - 1;
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/* Always need one TRB free in the ring. */
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left_on_ring -= 1;
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if (num_trbs > left_on_ring) {
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xhci_warn(xhci, "Not enough room on ring; "
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"need %u TRBs, %u TRBs left\n",
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num_trbs, left_on_ring);
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return 0;
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}
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return 1;
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}
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/* Make sure there's an extra empty TRB available */
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for (i = 0; i <= num_trbs; ++i) {
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if (enq == ring->dequeue)
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return 0;
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enq++;
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while (last_trb(xhci, ring, enq_seg, enq)) {
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enq_seg = enq_seg->next;
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enq = enq_seg->trbs;
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}
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}
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return 1;
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}
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void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
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{
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u64 temp;
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dma_addr_t deq;
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deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
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xhci->event_ring->dequeue);
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if (deq == 0 && !in_interrupt())
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xhci_warn(xhci, "WARN something wrong with SW event ring "
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"dequeue ptr.\n");
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/* Update HC event ring dequeue pointer */
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temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
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temp &= ERST_PTR_MASK;
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/* Don't clear the EHB bit (which is RW1C) because
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* there might be more events to service.
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*/
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temp &= ~ERST_EHB;
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xhci_dbg(xhci, "// Write event ring dequeue pointer, preserving EHB bit\n");
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xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK) | temp,
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&xhci->ir_set->erst_dequeue);
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}
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/* Ring the host controller doorbell after placing a command on the ring */
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void xhci_ring_cmd_db(struct xhci_hcd *xhci)
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{
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u32 temp;
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xhci_dbg(xhci, "// Ding dong!\n");
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temp = xhci_readl(xhci, &xhci->dba->doorbell[0]) & DB_MASK;
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xhci_writel(xhci, temp | DB_TARGET_HOST, &xhci->dba->doorbell[0]);
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/* Flush PCI posted writes */
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xhci_readl(xhci, &xhci->dba->doorbell[0]);
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}
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static void ring_ep_doorbell(struct xhci_hcd *xhci,
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unsigned int slot_id,
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unsigned int ep_index,
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unsigned int stream_id)
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{
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struct xhci_virt_ep *ep;
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unsigned int ep_state;
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u32 field;
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__u32 __iomem *db_addr = &xhci->dba->doorbell[slot_id];
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ep = &xhci->devs[slot_id]->eps[ep_index];
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ep_state = ep->ep_state;
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/* Don't ring the doorbell for this endpoint if there are pending
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* cancellations because the we don't want to interrupt processing.
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* We don't want to restart any stream rings if there's a set dequeue
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* pointer command pending because the device can choose to start any
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* stream once the endpoint is on the HW schedule.
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* FIXME - check all the stream rings for pending cancellations.
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*/
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if (!(ep_state & EP_HALT_PENDING) && !(ep_state & SET_DEQ_PENDING)
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&& !(ep_state & EP_HALTED)) {
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field = xhci_readl(xhci, db_addr) & DB_MASK;
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field |= EPI_TO_DB(ep_index) | STREAM_ID_TO_DB(stream_id);
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xhci_writel(xhci, field, db_addr);
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/* Flush PCI posted writes - FIXME Matthew Wilcox says this
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* isn't time-critical and we shouldn't make the CPU wait for
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* the flush.
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*/
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xhci_readl(xhci, db_addr);
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}
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}
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/* Ring the doorbell for any rings with pending URBs */
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static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci,
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unsigned int slot_id,
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unsigned int ep_index)
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{
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unsigned int stream_id;
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struct xhci_virt_ep *ep;
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ep = &xhci->devs[slot_id]->eps[ep_index];
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/* A ring has pending URBs if its TD list is not empty */
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if (!(ep->ep_state & EP_HAS_STREAMS)) {
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if (!(list_empty(&ep->ring->td_list)))
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ring_ep_doorbell(xhci, slot_id, ep_index, 0);
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return;
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}
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for (stream_id = 1; stream_id < ep->stream_info->num_streams;
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stream_id++) {
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struct xhci_stream_info *stream_info = ep->stream_info;
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if (!list_empty(&stream_info->stream_rings[stream_id]->td_list))
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ring_ep_doorbell(xhci, slot_id, ep_index, stream_id);
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}
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}
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/*
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* Find the segment that trb is in. Start searching in start_seg.
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* If we must move past a segment that has a link TRB with a toggle cycle state
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* bit set, then we will toggle the value pointed at by cycle_state.
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*/
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static struct xhci_segment *find_trb_seg(
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struct xhci_segment *start_seg,
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union xhci_trb *trb, int *cycle_state)
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{
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struct xhci_segment *cur_seg = start_seg;
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struct xhci_generic_trb *generic_trb;
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while (cur_seg->trbs > trb ||
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&cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
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generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
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if ((generic_trb->field[3] & TRB_TYPE_BITMASK) ==
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TRB_TYPE(TRB_LINK) &&
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(generic_trb->field[3] & LINK_TOGGLE))
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*cycle_state = ~(*cycle_state) & 0x1;
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cur_seg = cur_seg->next;
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if (cur_seg == start_seg)
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/* Looped over the entire list. Oops! */
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return NULL;
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}
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return cur_seg;
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}
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/*
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* Move the xHC's endpoint ring dequeue pointer past cur_td.
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* Record the new state of the xHC's endpoint ring dequeue segment,
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* dequeue pointer, and new consumer cycle state in state.
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* Update our internal representation of the ring's dequeue pointer.
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*
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* We do this in three jumps:
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* - 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.
|
|
*/
|
|
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_ring *ep_ring;
|
|
struct xhci_generic_trb *trb;
|
|
struct xhci_ep_ctx *ep_ctx;
|
|
dma_addr_t addr;
|
|
|
|
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;
|
|
}
|
|
state->new_cycle_state = 0;
|
|
xhci_dbg(xhci, "Finding segment containing stopped TRB.\n");
|
|
state->new_deq_seg = find_trb_seg(cur_td->start_seg,
|
|
dev->eps[ep_index].stopped_trb,
|
|
&state->new_cycle_state);
|
|
if (!state->new_deq_seg)
|
|
BUG();
|
|
/* Dig out the cycle state saved by the xHC during the stop ep cmd */
|
|
xhci_dbg(xhci, "Finding endpoint context\n");
|
|
ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
|
|
state->new_cycle_state = 0x1 & ep_ctx->deq;
|
|
|
|
state->new_deq_ptr = cur_td->last_trb;
|
|
xhci_dbg(xhci, "Finding segment containing last TRB in TD.\n");
|
|
state->new_deq_seg = find_trb_seg(state->new_deq_seg,
|
|
state->new_deq_ptr,
|
|
&state->new_cycle_state);
|
|
if (!state->new_deq_seg)
|
|
BUG();
|
|
|
|
trb = &state->new_deq_ptr->generic;
|
|
if ((trb->field[3] & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK) &&
|
|
(trb->field[3] & LINK_TOGGLE))
|
|
state->new_cycle_state = ~(state->new_cycle_state) & 0x1;
|
|
next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr);
|
|
|
|
/* Don't update the ring cycle state for the producer (us). */
|
|
xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n",
|
|
state->new_deq_seg);
|
|
addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr);
|
|
xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n",
|
|
(unsigned long long) addr);
|
|
xhci_dbg(xhci, "Setting dequeue pointer in internal ring state.\n");
|
|
ep_ring->dequeue = state->new_deq_ptr;
|
|
ep_ring->deq_seg = state->new_deq_seg;
|
|
}
|
|
|
|
static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
|
|
struct xhci_td *cur_td)
|
|
{
|
|
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 ((cur_trb->generic.field[3] & TRB_TYPE_BITMASK) ==
|
|
TRB_TYPE(TRB_LINK)) {
|
|
/* Unchain any chained Link TRBs, but
|
|
* leave the pointers intact.
|
|
*/
|
|
cur_trb->generic.field[3] &= ~TRB_CHAIN;
|
|
xhci_dbg(xhci, "Cancel (unchain) link TRB\n");
|
|
xhci_dbg(xhci, "Address = %p (0x%llx dma); "
|
|
"in seg %p (0x%llx dma)\n",
|
|
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] &= TRB_CYCLE;
|
|
cur_trb->generic.field[3] |= TRB_TYPE(TRB_TR_NOOP);
|
|
xhci_dbg(xhci, "Cancel TRB %p (0x%llx dma) "
|
|
"in seg %p (0x%llx dma)\n",
|
|
cur_trb,
|
|
(unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
|
|
cur_seg,
|
|
(unsigned long long)cur_seg->dma);
|
|
}
|
|
if (cur_trb == cur_td->last_trb)
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
|
|
unsigned int ep_index, unsigned int stream_id,
|
|
struct xhci_segment *deq_seg,
|
|
union xhci_trb *deq_ptr, u32 cycle_state);
|
|
|
|
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)
|
|
{
|
|
struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
|
|
|
|
xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
|
|
"new deq ptr = %p (0x%llx dma), new cycle = %u\n",
|
|
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);
|
|
queue_set_tr_deq(xhci, slot_id, ep_index, stream_id,
|
|
deq_state->new_deq_seg,
|
|
deq_state->new_deq_ptr,
|
|
(u32) deq_state->new_cycle_state);
|
|
/* 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;
|
|
}
|
|
|
|
static inline 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, char *adjective)
|
|
{
|
|
struct usb_hcd *hcd = xhci_to_hcd(xhci);
|
|
|
|
cur_td->urb->hcpriv = NULL;
|
|
usb_hcd_unlink_urb_from_ep(hcd, cur_td->urb);
|
|
xhci_dbg(xhci, "Giveback %s URB %p\n", adjective, cur_td->urb);
|
|
|
|
spin_unlock(&xhci->lock);
|
|
usb_hcd_giveback_urb(hcd, cur_td->urb, status);
|
|
kfree(cur_td);
|
|
spin_lock(&xhci->lock);
|
|
xhci_dbg(xhci, "%s URB given back\n", adjective);
|
|
}
|
|
|
|
/*
|
|
* 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 handle_stopped_endpoint(struct xhci_hcd *xhci,
|
|
union xhci_trb *trb)
|
|
{
|
|
unsigned int slot_id;
|
|
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;
|
|
|
|
memset(&deq_state, 0, sizeof(deq_state));
|
|
slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]);
|
|
ep_index = TRB_TO_EP_INDEX(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);
|
|
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(xhci, "Cancelling TD starting at %p, 0x%llx (dma).\n",
|
|
cur_td->first_trb,
|
|
(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);
|
|
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(&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;
|
|
ep->stopped_trb = 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(&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, "cancelled");
|
|
|
|
/* 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 */
|
|
}
|
|
|
|
/* 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;
|
|
struct xhci_virt_ep *temp_ep;
|
|
struct xhci_ring *ring;
|
|
struct xhci_td *cur_td;
|
|
int ret, i, j;
|
|
|
|
ep = (struct xhci_virt_ep *) arg;
|
|
xhci = ep->xhci;
|
|
|
|
spin_lock(&xhci->lock);
|
|
|
|
ep->stop_cmds_pending--;
|
|
if (xhci->xhc_state & XHCI_STATE_DYING) {
|
|
xhci_dbg(xhci, "Stop EP timer ran, but another timer marked "
|
|
"xHCI as DYING, exiting.\n");
|
|
spin_unlock(&xhci->lock);
|
|
return;
|
|
}
|
|
if (!(ep->stop_cmds_pending == 0 && (ep->ep_state & EP_HALT_PENDING))) {
|
|
xhci_dbg(xhci, "Stop EP timer ran, but no command pending, "
|
|
"exiting.\n");
|
|
spin_unlock(&xhci->lock);
|
|
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(&xhci->lock);
|
|
|
|
ret = xhci_halt(xhci);
|
|
|
|
spin_lock(&xhci->lock);
|
|
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, so we can set HC_STATE_HALT and notify the
|
|
* USB core. But 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++) {
|
|
temp_ep = &xhci->devs[i]->eps[j];
|
|
ring = temp_ep->ring;
|
|
if (!ring)
|
|
continue;
|
|
xhci_dbg(xhci, "Killing URBs for slot ID %u, "
|
|
"ep index %u\n", i, j);
|
|
while (!list_empty(&ring->td_list)) {
|
|
cur_td = list_first_entry(&ring->td_list,
|
|
struct xhci_td,
|
|
td_list);
|
|
list_del(&cur_td->td_list);
|
|
if (!list_empty(&cur_td->cancelled_td_list))
|
|
list_del(&cur_td->cancelled_td_list);
|
|
xhci_giveback_urb_in_irq(xhci, cur_td,
|
|
-ESHUTDOWN, "killed");
|
|
}
|
|
while (!list_empty(&temp_ep->cancelled_td_list)) {
|
|
cur_td = list_first_entry(
|
|
&temp_ep->cancelled_td_list,
|
|
struct xhci_td,
|
|
cancelled_td_list);
|
|
list_del(&cur_td->cancelled_td_list);
|
|
xhci_giveback_urb_in_irq(xhci, cur_td,
|
|
-ESHUTDOWN, "killed");
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&xhci->lock);
|
|
xhci_to_hcd(xhci)->state = HC_STATE_HALT;
|
|
xhci_dbg(xhci, "Calling usb_hc_died()\n");
|
|
usb_hc_died(xhci_to_hcd(xhci));
|
|
xhci_dbg(xhci, "xHCI host controller is dead.\n");
|
|
}
|
|
|
|
/*
|
|
* 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 handle_set_deq_completion(struct xhci_hcd *xhci,
|
|
struct xhci_event_cmd *event,
|
|
union xhci_trb *trb)
|
|
{
|
|
unsigned int slot_id;
|
|
unsigned int ep_index;
|
|
unsigned int stream_id;
|
|
struct xhci_ring *ep_ring;
|
|
struct xhci_virt_device *dev;
|
|
struct xhci_ep_ctx *ep_ctx;
|
|
struct xhci_slot_ctx *slot_ctx;
|
|
|
|
slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]);
|
|
ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]);
|
|
stream_id = TRB_TO_STREAM_ID(trb->generic.field[2]);
|
|
dev = xhci->devs[slot_id];
|
|
|
|
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??? */
|
|
dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
|
|
return;
|
|
}
|
|
|
|
ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
|
|
slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
|
|
|
|
if (GET_COMP_CODE(event->status) != COMP_SUCCESS) {
|
|
unsigned int ep_state;
|
|
unsigned int slot_state;
|
|
|
|
switch (GET_COMP_CODE(event->status)) {
|
|
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 = ep_ctx->ep_info;
|
|
ep_state &= EP_STATE_MASK;
|
|
slot_state = slot_ctx->dev_state;
|
|
slot_state = GET_SLOT_STATE(slot_state);
|
|
xhci_dbg(xhci, "Slot state = %u, EP state = %u\n",
|
|
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",
|
|
GET_COMP_CODE(event->status));
|
|
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 {
|
|
xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n",
|
|
ep_ctx->deq);
|
|
}
|
|
|
|
dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
|
|
/* Restart any rings with pending URBs */
|
|
ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
|
|
}
|
|
|
|
static void handle_reset_ep_completion(struct xhci_hcd *xhci,
|
|
struct xhci_event_cmd *event,
|
|
union xhci_trb *trb)
|
|
{
|
|
int slot_id;
|
|
unsigned int ep_index;
|
|
|
|
slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]);
|
|
ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]);
|
|
/* This command will only fail if the endpoint wasn't halted,
|
|
* but we don't care.
|
|
*/
|
|
xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n",
|
|
(unsigned int) GET_COMP_CODE(event->status));
|
|
|
|
/* 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) {
|
|
xhci_dbg(xhci, "Queueing configure endpoint command\n");
|
|
xhci_queue_configure_endpoint(xhci,
|
|
xhci->devs[slot_id]->in_ctx->dma, slot_id,
|
|
false);
|
|
xhci_ring_cmd_db(xhci);
|
|
} else {
|
|
/* Clear our internal halted state and restart the ring(s) */
|
|
xhci->devs[slot_id]->eps[ep_index].ep_state &= ~EP_HALTED;
|
|
ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
|
|
}
|
|
}
|
|
|
|
/* Check to see if a command in the device's command queue matches this one.
|
|
* Signal the completion or free the command, and return 1. Return 0 if the
|
|
* completed command isn't at the head of the command list.
|
|
*/
|
|
static int handle_cmd_in_cmd_wait_list(struct xhci_hcd *xhci,
|
|
struct xhci_virt_device *virt_dev,
|
|
struct xhci_event_cmd *event)
|
|
{
|
|
struct xhci_command *command;
|
|
|
|
if (list_empty(&virt_dev->cmd_list))
|
|
return 0;
|
|
|
|
command = list_entry(virt_dev->cmd_list.next,
|
|
struct xhci_command, cmd_list);
|
|
if (xhci->cmd_ring->dequeue != command->command_trb)
|
|
return 0;
|
|
|
|
command->status =
|
|
GET_COMP_CODE(event->status);
|
|
list_del(&command->cmd_list);
|
|
if (command->completion)
|
|
complete(command->completion);
|
|
else
|
|
xhci_free_command(xhci, command);
|
|
return 1;
|
|
}
|
|
|
|
static void handle_cmd_completion(struct xhci_hcd *xhci,
|
|
struct xhci_event_cmd *event)
|
|
{
|
|
int slot_id = TRB_TO_SLOT_ID(event->flags);
|
|
u64 cmd_dma;
|
|
dma_addr_t cmd_dequeue_dma;
|
|
struct xhci_input_control_ctx *ctrl_ctx;
|
|
struct xhci_virt_device *virt_dev;
|
|
unsigned int ep_index;
|
|
struct xhci_ring *ep_ring;
|
|
unsigned int ep_state;
|
|
|
|
cmd_dma = event->cmd_trb;
|
|
cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
|
|
xhci->cmd_ring->dequeue);
|
|
/* 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;
|
|
}
|
|
switch (xhci->cmd_ring->dequeue->generic.field[3] & TRB_TYPE_BITMASK) {
|
|
case TRB_TYPE(TRB_ENABLE_SLOT):
|
|
if (GET_COMP_CODE(event->status) == COMP_SUCCESS)
|
|
xhci->slot_id = slot_id;
|
|
else
|
|
xhci->slot_id = 0;
|
|
complete(&xhci->addr_dev);
|
|
break;
|
|
case TRB_TYPE(TRB_DISABLE_SLOT):
|
|
if (xhci->devs[slot_id])
|
|
xhci_free_virt_device(xhci, slot_id);
|
|
break;
|
|
case TRB_TYPE(TRB_CONFIG_EP):
|
|
virt_dev = xhci->devs[slot_id];
|
|
if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
|
|
break;
|
|
/*
|
|
* 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.
|
|
*/
|
|
ctrl_ctx = xhci_get_input_control_ctx(xhci,
|
|
virt_dev->in_ctx);
|
|
/* Input ctx add_flags are the endpoint index plus one */
|
|
ep_index = xhci_last_valid_endpoint(ctrl_ctx->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 &&
|
|
ctrl_ctx->add_flags - SLOT_FLAG ==
|
|
ctrl_ctx->drop_flags) {
|
|
ep_ring = xhci->devs[slot_id]->eps[ep_index].ring;
|
|
ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
|
|
if (!(ep_state & EP_HALTED))
|
|
goto bandwidth_change;
|
|
xhci_dbg(xhci, "Completed config ep cmd - "
|
|
"last ep index = %d, state = %d\n",
|
|
ep_index, ep_state);
|
|
/* Clear internal halted state and restart ring(s) */
|
|
xhci->devs[slot_id]->eps[ep_index].ep_state &=
|
|
~EP_HALTED;
|
|
ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
|
|
break;
|
|
}
|
|
bandwidth_change:
|
|
xhci_dbg(xhci, "Completed config ep cmd\n");
|
|
xhci->devs[slot_id]->cmd_status =
|
|
GET_COMP_CODE(event->status);
|
|
complete(&xhci->devs[slot_id]->cmd_completion);
|
|
break;
|
|
case TRB_TYPE(TRB_EVAL_CONTEXT):
|
|
virt_dev = xhci->devs[slot_id];
|
|
if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
|
|
break;
|
|
xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status);
|
|
complete(&xhci->devs[slot_id]->cmd_completion);
|
|
break;
|
|
case TRB_TYPE(TRB_ADDR_DEV):
|
|
xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status);
|
|
complete(&xhci->addr_dev);
|
|
break;
|
|
case TRB_TYPE(TRB_STOP_RING):
|
|
handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue);
|
|
break;
|
|
case TRB_TYPE(TRB_SET_DEQ):
|
|
handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue);
|
|
break;
|
|
case TRB_TYPE(TRB_CMD_NOOP):
|
|
++xhci->noops_handled;
|
|
break;
|
|
case TRB_TYPE(TRB_RESET_EP):
|
|
handle_reset_ep_completion(xhci, event, xhci->cmd_ring->dequeue);
|
|
break;
|
|
case TRB_TYPE(TRB_RESET_DEV):
|
|
xhci_dbg(xhci, "Completed reset device command.\n");
|
|
slot_id = TRB_TO_SLOT_ID(
|
|
xhci->cmd_ring->dequeue->generic.field[3]);
|
|
virt_dev = xhci->devs[slot_id];
|
|
if (virt_dev)
|
|
handle_cmd_in_cmd_wait_list(xhci, virt_dev, event);
|
|
else
|
|
xhci_warn(xhci, "Reset device command completion "
|
|
"for disabled slot %u\n", slot_id);
|
|
break;
|
|
case TRB_TYPE(TRB_NEC_GET_FW):
|
|
if (!(xhci->quirks & XHCI_NEC_HOST)) {
|
|
xhci->error_bitmask |= 1 << 6;
|
|
break;
|
|
}
|
|
xhci_dbg(xhci, "NEC firmware version %2x.%02x\n",
|
|
NEC_FW_MAJOR(event->status),
|
|
NEC_FW_MINOR(event->status));
|
|
break;
|
|
default:
|
|
/* Skip over unknown commands on the event ring */
|
|
xhci->error_bitmask |= 1 << 6;
|
|
break;
|
|
}
|
|
inc_deq(xhci, xhci->cmd_ring, false);
|
|
}
|
|
|
|
static void handle_vendor_event(struct xhci_hcd *xhci,
|
|
union xhci_trb *event)
|
|
{
|
|
u32 trb_type;
|
|
|
|
trb_type = TRB_FIELD_TO_TYPE(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);
|
|
}
|
|
|
|
static void handle_port_status(struct xhci_hcd *xhci,
|
|
union xhci_trb *event)
|
|
{
|
|
u32 port_id;
|
|
|
|
/* Port status change events always have a successful completion code */
|
|
if (GET_COMP_CODE(event->generic.field[2]) != COMP_SUCCESS) {
|
|
xhci_warn(xhci, "WARN: xHC returned failed port status event\n");
|
|
xhci->error_bitmask |= 1 << 8;
|
|
}
|
|
/* FIXME: core doesn't care about all port link state changes yet */
|
|
port_id = GET_PORT_ID(event->generic.field[0]);
|
|
xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id);
|
|
|
|
/* Update event ring dequeue pointer before dropping the lock */
|
|
inc_deq(xhci, xhci->event_ring, true);
|
|
xhci_set_hc_event_deq(xhci);
|
|
|
|
spin_unlock(&xhci->lock);
|
|
/* Pass this up to the core */
|
|
usb_hcd_poll_rh_status(xhci_to_hcd(xhci));
|
|
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_segment *start_seg,
|
|
union xhci_trb *start_trb,
|
|
union xhci_trb *end_trb,
|
|
dma_addr_t suspect_dma)
|
|
{
|
|
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 (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];
|
|
ep->ep_state |= EP_HALTED;
|
|
ep->stopped_td = td;
|
|
ep->stopped_trb = event_trb;
|
|
ep->stopped_stream = stream_id;
|
|
|
|
xhci_queue_reset_ep(xhci, slot_id, ep_index);
|
|
xhci_cleanup_stalled_ring(xhci, td->urb->dev, ep_index);
|
|
|
|
ep->stopped_td = NULL;
|
|
ep->stopped_trb = NULL;
|
|
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 & EP_STATE_MASK) == 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;
|
|
u32 trb_comp_code;
|
|
|
|
slot_id = TRB_TO_SLOT_ID(event->flags);
|
|
xdev = xhci->devs[slot_id];
|
|
ep_index = TRB_TO_EP_ID(event->flags) - 1;
|
|
ep_ring = xhci_dma_to_transfer_ring(ep, event->buffer);
|
|
ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
|
|
trb_comp_code = GET_COMP_CODE(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;
|
|
ep->stopped_trb = event_trb;
|
|
return 0;
|
|
} else {
|
|
if (trb_comp_code == COMP_STALL) {
|
|
/* The transfer is completed from the driver's
|
|
* perspective, but we need to issue a set dequeue
|
|
* command for this stalled endpoint to move the dequeue
|
|
* pointer past the TD. We can't do that here because
|
|
* the halt condition must be cleared first. Let the
|
|
* USB class driver clear the stall later.
|
|
*/
|
|
ep->stopped_td = td;
|
|
ep->stopped_trb = event_trb;
|
|
ep->stopped_stream = ep_ring->stream_id;
|
|
} else if (xhci_requires_manual_halt_cleanup(xhci,
|
|
ep_ctx, trb_comp_code)) {
|
|
/* Other types of errors halt the endpoint, but the
|
|
* class driver doesn't call usb_reset_endpoint() unless
|
|
* the error is -EPIPE. Clear the halted status in the
|
|
* xHCI hardware manually.
|
|
*/
|
|
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, false);
|
|
inc_deq(xhci, ep_ring, false);
|
|
}
|
|
|
|
td_cleanup:
|
|
/* Clean up the endpoint's TD list */
|
|
urb = td->urb;
|
|
|
|
/* 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(&td->td_list);
|
|
/* Was this TD slated to be cancelled but completed anyway? */
|
|
if (!list_empty(&td->cancelled_td_list))
|
|
list_del(&td->cancelled_td_list);
|
|
|
|
ret = 1;
|
|
}
|
|
|
|
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(event->flags);
|
|
xdev = xhci->devs[slot_id];
|
|
ep_index = TRB_TO_EP_ID(event->flags) - 1;
|
|
ep_ring = xhci_dma_to_transfer_ring(ep, event->buffer);
|
|
ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
|
|
trb_comp_code = GET_COMP_CODE(event->transfer_len);
|
|
|
|
xhci_debug_trb(xhci, xhci->event_ring->dequeue);
|
|
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 {
|
|
xhci_dbg(xhci, "Successful control transfer!\n");
|
|
*status = 0;
|
|
}
|
|
break;
|
|
case COMP_SHORT_TX:
|
|
xhci_warn(xhci, "WARN: short transfer on control ep\n");
|
|
if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
|
|
*status = -EREMOTEIO;
|
|
else
|
|
*status = 0;
|
|
break;
|
|
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
|
|
- TRB_LEN(event->transfer_len);
|
|
else
|
|
td->urb->actual_length = 0;
|
|
|
|
xhci_cleanup_halted_endpoint(xhci,
|
|
slot_id, ep_index, 0, td, event_trb);
|
|
return finish_td(xhci, td, event_trb, event, ep, status, true);
|
|
}
|
|
/*
|
|
* 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? */
|
|
if (trb_comp_code != COMP_STOP_INVAL) {
|
|
/* We didn't stop on a link TRB in the middle */
|
|
td->urb->actual_length =
|
|
td->urb->transfer_buffer_length -
|
|
TRB_LEN(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 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, event->buffer);
|
|
trb_comp_code = GET_COMP_CODE(event->transfer_len);
|
|
|
|
switch (trb_comp_code) {
|
|
case COMP_SUCCESS:
|
|
/* Double check that the HW transferred everything. */
|
|
if (event_trb != td->last_trb) {
|
|
xhci_warn(xhci, "WARN Successful completion "
|
|
"on short TX\n");
|
|
if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
|
|
*status = -EREMOTEIO;
|
|
else
|
|
*status = 0;
|
|
} else {
|
|
if (usb_endpoint_xfer_bulk(&td->urb->ep->desc))
|
|
xhci_dbg(xhci, "Successful bulk "
|
|
"transfer!\n");
|
|
else
|
|
xhci_dbg(xhci, "Successful interrupt "
|
|
"transfer!\n");
|
|
*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;
|
|
}
|
|
dev_dbg(&td->urb->dev->dev,
|
|
"ep %#x - asked for %d bytes, "
|
|
"%d bytes untransferred\n",
|
|
td->urb->ep->desc.bEndpointAddress,
|
|
td->urb->transfer_buffer_length,
|
|
TRB_LEN(event->transfer_len));
|
|
/* Fast path - was this the last TRB in the TD for this URB? */
|
|
if (event_trb == td->last_trb) {
|
|
if (TRB_LEN(event->transfer_len) != 0) {
|
|
td->urb->actual_length =
|
|
td->urb->transfer_buffer_length -
|
|
TRB_LEN(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",
|
|
TRB_LEN(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 ((cur_trb->generic.field[3] &
|
|
TRB_TYPE_BITMASK) != TRB_TYPE(TRB_TR_NOOP) &&
|
|
(cur_trb->generic.field[3] &
|
|
TRB_TYPE_BITMASK) != TRB_TYPE(TRB_LINK))
|
|
td->urb->actual_length +=
|
|
TRB_LEN(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(cur_trb->generic.field[2]) -
|
|
TRB_LEN(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)
|
|
{
|
|
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 xhci_ep_ctx *ep_ctx;
|
|
u32 trb_comp_code;
|
|
int ret = 0;
|
|
|
|
slot_id = TRB_TO_SLOT_ID(event->flags);
|
|
xdev = xhci->devs[slot_id];
|
|
if (!xdev) {
|
|
xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Endpoint ID is 1 based, our index is zero based */
|
|
ep_index = TRB_TO_EP_ID(event->flags) - 1;
|
|
xhci_dbg(xhci, "%s - ep index = %d\n", __func__, ep_index);
|
|
ep = &xdev->eps[ep_index];
|
|
ep_ring = xhci_dma_to_transfer_ring(ep, event->buffer);
|
|
ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
|
|
if (!ep_ring || (ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED) {
|
|
xhci_err(xhci, "ERROR Transfer event for disabled endpoint "
|
|
"or incorrect stream ring\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
event_dma = event->buffer;
|
|
/* This TRB should be in the TD at the head of this ring's TD list */
|
|
if (list_empty(&ep_ring->td_list)) {
|
|
xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n",
|
|
TRB_TO_SLOT_ID(event->flags), ep_index);
|
|
xhci_dbg(xhci, "Event TRB with TRB type ID %u\n",
|
|
(unsigned int) (event->flags & TRB_TYPE_BITMASK)>>10);
|
|
xhci_print_trb_offsets(xhci, (union xhci_trb *) event);
|
|
goto cleanup;
|
|
}
|
|
td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list);
|
|
|
|
/* Is this a TRB in the currently executing TD? */
|
|
event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue,
|
|
td->last_trb, event_dma);
|
|
if (!event_seg) {
|
|
/* HC is busted, give up! */
|
|
xhci_err(xhci, "ERROR Transfer event TRB DMA ptr not part of current TD\n");
|
|
return -ESHUTDOWN;
|
|
}
|
|
event_trb = &event_seg->trbs[(event_dma - event_seg->dma) / sizeof(*event_trb)];
|
|
|
|
/* Look for common error cases */
|
|
trb_comp_code = GET_COMP_CODE(event->transfer_len);
|
|
switch (trb_comp_code) {
|
|
/* Skip codes that require special handling depending on
|
|
* transfer type
|
|
*/
|
|
case COMP_SUCCESS:
|
|
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_warn(xhci, "WARN: 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_warn(xhci, "WARN: transfer error on endpoint\n");
|
|
status = -EPROTO;
|
|
break;
|
|
case COMP_BABBLE:
|
|
xhci_warn(xhci, "WARN: 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;
|
|
default:
|
|
if (xhci_is_vendor_info_code(xhci, trb_comp_code)) {
|
|
status = 0;
|
|
break;
|
|
}
|
|
xhci_warn(xhci, "ERROR Unknown event condition, HC probably busted\n");
|
|
goto cleanup;
|
|
}
|
|
/* Now update the urb's actual_length and give back to the core */
|
|
/* Was this a control transfer? */
|
|
if (usb_endpoint_xfer_control(&td->urb->ep->desc))
|
|
ret = process_ctrl_td(xhci, td, event_trb, event, ep,
|
|
&status);
|
|
else
|
|
ret = process_bulk_intr_td(xhci, td, event_trb, event, ep,
|
|
&status);
|
|
|
|
cleanup:
|
|
inc_deq(xhci, xhci->event_ring, true);
|
|
xhci_set_hc_event_deq(xhci);
|
|
|
|
/* FIXME for multi-TD URBs (who have buffers bigger than 64MB) */
|
|
if (ret) {
|
|
urb = td->urb;
|
|
/* Leave the TD around for the reset endpoint function to use
|
|
* (but only if it's not a control endpoint, since we already
|
|
* queued the Set TR dequeue pointer command for stalled
|
|
* control endpoints).
|
|
*/
|
|
if (usb_endpoint_xfer_control(&urb->ep->desc) ||
|
|
(trb_comp_code != COMP_STALL &&
|
|
trb_comp_code != COMP_BABBLE))
|
|
kfree(td);
|
|
|
|
usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), urb);
|
|
xhci_dbg(xhci, "Giveback URB %p, len = %d, status = %d\n",
|
|
urb, urb->actual_length, status);
|
|
spin_unlock(&xhci->lock);
|
|
usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, status);
|
|
spin_lock(&xhci->lock);
|
|
}
|
|
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).
|
|
*/
|
|
void xhci_handle_event(struct xhci_hcd *xhci)
|
|
{
|
|
union xhci_trb *event;
|
|
int update_ptrs = 1;
|
|
int ret;
|
|
|
|
xhci_dbg(xhci, "In %s\n", __func__);
|
|
if (!xhci->event_ring || !xhci->event_ring->dequeue) {
|
|
xhci->error_bitmask |= 1 << 1;
|
|
return;
|
|
}
|
|
|
|
event = xhci->event_ring->dequeue;
|
|
/* Does the HC or OS own the TRB? */
|
|
if ((event->event_cmd.flags & TRB_CYCLE) !=
|
|
xhci->event_ring->cycle_state) {
|
|
xhci->error_bitmask |= 1 << 2;
|
|
return;
|
|
}
|
|
xhci_dbg(xhci, "%s - OS owns TRB\n", __func__);
|
|
|
|
/* FIXME: Handle more event types. */
|
|
switch ((event->event_cmd.flags & TRB_TYPE_BITMASK)) {
|
|
case TRB_TYPE(TRB_COMPLETION):
|
|
xhci_dbg(xhci, "%s - calling handle_cmd_completion\n", __func__);
|
|
handle_cmd_completion(xhci, &event->event_cmd);
|
|
xhci_dbg(xhci, "%s - returned from handle_cmd_completion\n", __func__);
|
|
break;
|
|
case TRB_TYPE(TRB_PORT_STATUS):
|
|
xhci_dbg(xhci, "%s - calling handle_port_status\n", __func__);
|
|
handle_port_status(xhci, event);
|
|
xhci_dbg(xhci, "%s - returned from handle_port_status\n", __func__);
|
|
update_ptrs = 0;
|
|
break;
|
|
case TRB_TYPE(TRB_TRANSFER):
|
|
xhci_dbg(xhci, "%s - calling handle_tx_event\n", __func__);
|
|
ret = handle_tx_event(xhci, &event->trans_event);
|
|
xhci_dbg(xhci, "%s - returned from handle_tx_event\n", __func__);
|
|
if (ret < 0)
|
|
xhci->error_bitmask |= 1 << 9;
|
|
else
|
|
update_ptrs = 0;
|
|
break;
|
|
default:
|
|
if ((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;
|
|
}
|
|
|
|
if (update_ptrs) {
|
|
/* Update SW and HC event ring dequeue pointer */
|
|
inc_deq(xhci, xhci->event_ring, true);
|
|
xhci_set_hc_event_deq(xhci);
|
|
}
|
|
/* Are there more items on the event ring? */
|
|
xhci_handle_event(xhci);
|
|
}
|
|
|
|
/**** 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 consumer, bool more_trbs_coming,
|
|
u32 field1, u32 field2, u32 field3, u32 field4)
|
|
{
|
|
struct xhci_generic_trb *trb;
|
|
|
|
trb = &ring->enqueue->generic;
|
|
trb->field[0] = field1;
|
|
trb->field[1] = field2;
|
|
trb->field[2] = field3;
|
|
trb->field[3] = field4;
|
|
inc_enq(xhci, ring, consumer, 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)
|
|
{
|
|
/* Make sure the endpoint has been added to xHC schedule */
|
|
xhci_dbg(xhci, "Endpoint state = 0x%x\n", ep_state);
|
|
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;
|
|
}
|
|
if (!room_on_ring(xhci, ep_ring, num_trbs)) {
|
|
/* FIXME allocate more room */
|
|
xhci_err(xhci, "ERROR no room on ep ring\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (enqueue_is_link_trb(ep_ring)) {
|
|
struct xhci_ring *ring = ep_ring;
|
|
union xhci_trb *next;
|
|
|
|
xhci_dbg(xhci, "prepare_ring: pointing to link trb\n");
|
|
next = ring->enqueue;
|
|
|
|
while (last_trb(xhci, ring, ring->enq_seg, next)) {
|
|
|
|
/* If we're not dealing with 0.95 hardware,
|
|
* clear the chain bit.
|
|
*/
|
|
if (!xhci_link_trb_quirk(xhci))
|
|
next->link.control &= ~TRB_CHAIN;
|
|
else
|
|
next->link.control |= TRB_CHAIN;
|
|
|
|
wmb();
|
|
next->link.control ^= (u32) 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);
|
|
if (!in_interrupt()) {
|
|
xhci_dbg(xhci, "queue_trb: Toggle cycle "
|
|
"state for ring %p = %i\n",
|
|
ring, (unsigned int)ring->cycle_state);
|
|
}
|
|
}
|
|
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,
|
|
struct xhci_td **td,
|
|
gfp_t mem_flags)
|
|
{
|
|
int ret;
|
|
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,
|
|
ep_ctx->ep_info & EP_STATE_MASK,
|
|
num_trbs, mem_flags);
|
|
if (ret)
|
|
return ret;
|
|
*td = kzalloc(sizeof(struct xhci_td), mem_flags);
|
|
if (!*td)
|
|
return -ENOMEM;
|
|
INIT_LIST_HEAD(&(*td)->td_list);
|
|
INIT_LIST_HEAD(&(*td)->cancelled_td_list);
|
|
|
|
ret = usb_hcd_link_urb_to_ep(xhci_to_hcd(xhci), urb);
|
|
if (unlikely(ret)) {
|
|
kfree(*td);
|
|
return ret;
|
|
}
|
|
|
|
(*td)->urb = urb;
|
|
urb->hcpriv = (void *) (*td);
|
|
/* 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;
|
|
|
|
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_sgs;
|
|
temp = urb->transfer_buffer_length;
|
|
|
|
xhci_dbg(xhci, "count sg list trbs: \n");
|
|
num_trbs = 0;
|
|
for_each_sg(urb->sg, sg, num_sgs, i) {
|
|
unsigned int previous_total_trbs = num_trbs;
|
|
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) & ((1 << TRB_MAX_BUFF_SHIFT) - 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)) {
|
|
num_trbs++;
|
|
running_total += TRB_MAX_BUFF_SIZE;
|
|
}
|
|
xhci_dbg(xhci, " sg #%d: dma = %#llx, len = %#x (%d), num_trbs = %d\n",
|
|
i, (unsigned long long)sg_dma_address(sg),
|
|
len, len, num_trbs - previous_total_trbs);
|
|
|
|
len = min_t(int, len, temp);
|
|
temp -= len;
|
|
if (temp == 0)
|
|
break;
|
|
}
|
|
xhci_dbg(xhci, "\n");
|
|
if (!in_interrupt())
|
|
dev_dbg(&urb->dev->dev, "ep %#x - urb len = %d, sglist used, num_trbs = %d\n",
|
|
urb->ep->desc.bEndpointAddress,
|
|
urb->transfer_buffer_length,
|
|
num_trbs);
|
|
return num_trbs;
|
|
}
|
|
|
|
static void check_trb_math(struct urb *urb, int num_trbs, int running_total)
|
|
{
|
|
if (num_trbs != 0)
|
|
dev_dbg(&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_dbg(&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, struct xhci_td *td)
|
|
{
|
|
/*
|
|
* Pass all the TRBs to the hardware at once and make sure this write
|
|
* isn't reordered.
|
|
*/
|
|
wmb();
|
|
start_trb->field[3] |= start_cycle;
|
|
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(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) {
|
|
if (!printk_ratelimit())
|
|
dev_dbg(&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, GFP_ATOMIC, 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;
|
|
}
|
|
|
|
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 xhci_td *td;
|
|
struct scatterlist *sg;
|
|
int num_sgs;
|
|
int trb_buff_len, this_sg_len, running_total;
|
|
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_sgs;
|
|
|
|
trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id],
|
|
ep_index, urb->stream_id,
|
|
num_trbs, urb, &td, mem_flags);
|
|
if (trb_buff_len < 0)
|
|
return trb_buff_len;
|
|
/*
|
|
* 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 & ((1 << TRB_MAX_BUFF_SHIFT) - 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;
|
|
xhci_dbg(xhci, "First length to xfer from 1st sglist entry = %u\n",
|
|
trb_buff_len);
|
|
|
|
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;
|
|
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;
|
|
}
|
|
xhci_dbg(xhci, " sg entry: dma = %#x, len = %#x (%d), "
|
|
"64KB boundary at %#x, end dma = %#x\n",
|
|
(unsigned int) addr, trb_buff_len, trb_buff_len,
|
|
(unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
|
|
(unsigned int) addr + trb_buff_len);
|
|
if (TRB_MAX_BUFF_SIZE -
|
|
(addr & ((1 << TRB_MAX_BUFF_SHIFT) - 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);
|
|
}
|
|
remainder = xhci_td_remainder(urb->transfer_buffer_length -
|
|
running_total) ;
|
|
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, false, more_trbs_coming,
|
|
lower_32_bits(addr),
|
|
upper_32_bits(addr),
|
|
length_field,
|
|
/* We always want to know if the TRB was short,
|
|
* or we won't get an event when it completes.
|
|
* (Unless we use event data TRBs, which are a
|
|
* waste of space and HC resources.)
|
|
*/
|
|
field | TRB_ISP | 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 & ((1 << TRB_MAX_BUFF_SHIFT) - 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, td);
|
|
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 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;
|
|
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 & ((1 << TRB_MAX_BUFF_SHIFT) - 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 */
|
|
|
|
if (!in_interrupt())
|
|
dev_dbg(&urb->dev->dev, "ep %#x - urb len = %#x (%d), addr = %#llx, num_trbs = %d\n",
|
|
urb->ep->desc.bEndpointAddress,
|
|
urb->transfer_buffer_length,
|
|
urb->transfer_buffer_length,
|
|
(unsigned long long)urb->transfer_dma,
|
|
num_trbs);
|
|
|
|
ret = prepare_transfer(xhci, xhci->devs[slot_id],
|
|
ep_index, urb->stream_id,
|
|
num_trbs, urb, &td, mem_flags);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* 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? */
|
|
addr = (u64) urb->transfer_dma;
|
|
trb_buff_len = TRB_MAX_BUFF_SIZE -
|
|
(urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
|
|
if (urb->transfer_buffer_length < trb_buff_len)
|
|
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;
|
|
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;
|
|
}
|
|
remainder = xhci_td_remainder(urb->transfer_buffer_length -
|
|
running_total);
|
|
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, false, more_trbs_coming,
|
|
lower_32_bits(addr),
|
|
upper_32_bits(addr),
|
|
length_field,
|
|
/* We always want to know if the TRB was short,
|
|
* or we won't get an event when it completes.
|
|
* (Unless we use event data TRBs, which are a
|
|
* waste of space and HC resources.)
|
|
*/
|
|
field | TRB_ISP | 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, td);
|
|
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 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;
|
|
|
|
if (!in_interrupt())
|
|
xhci_dbg(xhci, "Queueing ctrl tx for slot id %d, ep %d\n",
|
|
slot_id, ep_index);
|
|
/* 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, &td, mem_flags);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* 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;
|
|
queue_trb(xhci, ep_ring, false, true,
|
|
/* FIXME endianness is probably going to bite my ass here. */
|
|
setup->bRequestType | setup->bRequest << 8 | setup->wValue << 16,
|
|
setup->wIndex | setup->wLength << 16,
|
|
TRB_LEN(8) | TRB_INTR_TARGET(0),
|
|
/* Immediate data in pointer */
|
|
TRB_IDT | TRB_TYPE(TRB_SETUP));
|
|
|
|
/* If there's data, queue data TRBs */
|
|
field = 0;
|
|
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, false, true,
|
|
lower_32_bits(urb->transfer_dma),
|
|
upper_32_bits(urb->transfer_dma),
|
|
length_field,
|
|
/* Event on short tx */
|
|
field | TRB_ISP | TRB_TYPE(TRB_DATA) | 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, 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, td);
|
|
return 0;
|
|
}
|
|
|
|
/**** 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, u32 field1, u32 field2,
|
|
u32 field3, u32 field4, bool command_must_succeed)
|
|
{
|
|
int reserved_trbs = xhci->cmd_ring_reserved_trbs;
|
|
int ret;
|
|
|
|
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;
|
|
}
|
|
queue_trb(xhci, xhci->cmd_ring, false, false, field1, field2, field3,
|
|
field4 | xhci->cmd_ring->cycle_state);
|
|
return 0;
|
|
}
|
|
|
|
/* Queue a no-op command on the command ring */
|
|
static int queue_cmd_noop(struct xhci_hcd *xhci)
|
|
{
|
|
return queue_command(xhci, 0, 0, 0, TRB_TYPE(TRB_CMD_NOOP), false);
|
|
}
|
|
|
|
/*
|
|
* Place a no-op command on the command ring to test the command and
|
|
* event ring.
|
|
*/
|
|
void *xhci_setup_one_noop(struct xhci_hcd *xhci)
|
|
{
|
|
if (queue_cmd_noop(xhci) < 0)
|
|
return NULL;
|
|
xhci->noops_submitted++;
|
|
return xhci_ring_cmd_db;
|
|
}
|
|
|
|
/* Queue a slot enable or disable request on the command ring */
|
|
int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id)
|
|
{
|
|
return queue_command(xhci, 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, dma_addr_t in_ctx_ptr,
|
|
u32 slot_id)
|
|
{
|
|
return queue_command(xhci, lower_32_bits(in_ctx_ptr),
|
|
upper_32_bits(in_ctx_ptr), 0,
|
|
TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id),
|
|
false);
|
|
}
|
|
|
|
int xhci_queue_vendor_command(struct xhci_hcd *xhci,
|
|
u32 field1, u32 field2, u32 field3, u32 field4)
|
|
{
|
|
return queue_command(xhci, field1, field2, field3, field4, false);
|
|
}
|
|
|
|
/* Queue a reset device command TRB */
|
|
int xhci_queue_reset_device(struct xhci_hcd *xhci, u32 slot_id)
|
|
{
|
|
return queue_command(xhci, 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, dma_addr_t in_ctx_ptr,
|
|
u32 slot_id, bool command_must_succeed)
|
|
{
|
|
return queue_command(xhci, 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, dma_addr_t in_ctx_ptr,
|
|
u32 slot_id)
|
|
{
|
|
return queue_command(xhci, lower_32_bits(in_ctx_ptr),
|
|
upper_32_bits(in_ctx_ptr), 0,
|
|
TRB_TYPE(TRB_EVAL_CONTEXT) | SLOT_ID_FOR_TRB(slot_id),
|
|
false);
|
|
}
|
|
|
|
int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, 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_STOP_RING);
|
|
|
|
return queue_command(xhci, 0, 0, 0,
|
|
trb_slot_id | trb_ep_index | type, false);
|
|
}
|
|
|
|
/* Set Transfer Ring Dequeue Pointer command.
|
|
* This should not be used for endpoints that have streams enabled.
|
|
*/
|
|
static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
|
|
unsigned int ep_index, unsigned int stream_id,
|
|
struct xhci_segment *deq_seg,
|
|
union xhci_trb *deq_ptr, u32 cycle_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 type = TRB_TYPE(TRB_SET_DEQ);
|
|
|
|
addr = xhci_trb_virt_to_dma(deq_seg, 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_seg, deq_ptr);
|
|
return 0;
|
|
}
|
|
return queue_command(xhci, lower_32_bits(addr) | cycle_state,
|
|
upper_32_bits(addr), trb_stream_id,
|
|
trb_slot_id | trb_ep_index | type, false);
|
|
}
|
|
|
|
int xhci_queue_reset_ep(struct xhci_hcd *xhci, 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, 0, 0, 0, trb_slot_id | trb_ep_index | type,
|
|
false);
|
|
}
|