static inline void
qh_update (struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd)
{
+ struct ehci_qh_hw *hw = qh->hw;
+
/* writes to an active overlay are unsafe */
BUG_ON(qh->qh_state != QH_STATE_IDLE);
- qh->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma);
- qh->hw_alt_next = EHCI_LIST_END(ehci);
+ hw->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma);
+ hw->hw_alt_next = EHCI_LIST_END(ehci);
/* Except for control endpoints, we make hardware maintain data
* toggle (like OHCI) ... here (re)initialize the toggle in the QH,
* and set the pseudo-toggle in udev. Only usb_clear_halt() will
* ever clear it.
*/
- if (!(qh->hw_info1 & cpu_to_hc32(ehci, 1 << 14))) {
+ if (!(hw->hw_info1 & cpu_to_hc32(ehci, 1 << 14))) {
unsigned is_out, epnum;
is_out = !(qtd->hw_token & cpu_to_hc32(ehci, 1 << 8));
- epnum = (hc32_to_cpup(ehci, &qh->hw_info1) >> 8) & 0x0f;
+ epnum = (hc32_to_cpup(ehci, &hw->hw_info1) >> 8) & 0x0f;
if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) {
- qh->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
+ hw->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
usb_settoggle (qh->dev, epnum, is_out, 1);
}
}
/* HC must see latest qtd and qh data before we clear ACTIVE+HALT */
wmb ();
- qh->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING);
+ hw->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING);
}
/* if it weren't for a common silicon quirk (writing the dummy into the qh
qtd = list_entry (qh->qtd_list.next,
struct ehci_qtd, qtd_list);
/* first qtd may already be partially processed */
- if (cpu_to_hc32(ehci, qtd->qtd_dma) == qh->hw_current)
+ if (cpu_to_hc32(ehci, qtd->qtd_dma) == qh->hw->hw_current)
qtd = NULL;
}
struct ehci_qh *qh = (struct ehci_qh *) urb->hcpriv;
/* S-mask in a QH means it's an interrupt urb */
- if ((qh->hw_info2 & cpu_to_hc32(ehci, QH_SMASK)) != 0) {
+ if ((qh->hw->hw_info2 & cpu_to_hc32(ehci, QH_SMASK)) != 0) {
/* ... update hc-wide periodic stats (for usbfs) */
ehci_to_hcd(ehci)->self.bandwidth_int_reqs--;
static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh);
static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh);
-static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh);
static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh);
/*
static unsigned
qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
{
- struct ehci_qtd *last = NULL, *end = qh->dummy;
+ struct ehci_qtd *last, *end = qh->dummy;
struct list_head *entry, *tmp;
- int last_status = -EINPROGRESS;
+ int last_status;
int stopped;
unsigned count = 0;
u8 state;
- __le32 halt = HALT_BIT(ehci);
+ const __le32 halt = HALT_BIT(ehci);
+ struct ehci_qh_hw *hw = qh->hw;
if (unlikely (list_empty (&qh->qtd_list)))
return count;
* they add urbs to this qh's queue or mark them for unlinking.
*
* NOTE: unlinking expects to be done in queue order.
+ *
+ * It's a bug for qh->qh_state to be anything other than
+ * QH_STATE_IDLE, unless our caller is scan_async() or
+ * scan_periodic().
*/
state = qh->qh_state;
qh->qh_state = QH_STATE_COMPLETING;
stopped = (state == QH_STATE_IDLE);
+ rescan:
+ last = NULL;
+ last_status = -EINPROGRESS;
+ qh->needs_rescan = 0;
+
/* remove de-activated QTDs from front of queue.
* after faults (including short reads), cleanup this urb
* then let the queue advance.
*/
if ((token & QTD_STS_XACT) &&
QTD_CERR(token) == 0 &&
- --qh->xacterrs > 0 &&
+ ++qh->xacterrs < QH_XACTERR_MAX &&
!urb->unlinked) {
ehci_dbg(ehci,
"detected XactErr len %zu/%zu retry %d\n",
- qtd->length - QTD_LENGTH(token), qtd->length,
- QH_XACTERR_MAX - qh->xacterrs);
+ qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
/* reset the token in the qtd and the
* qh overlay (which still contains
qtd->hw_token = cpu_to_hc32(ehci,
token);
wmb();
- qh->hw_token = cpu_to_hc32(ehci, token);
+ hw->hw_token = cpu_to_hc32(ehci,
+ token);
goto retry_xacterr;
}
stopped = 1;
/* qh unlinked; token in overlay may be most current */
if (state == QH_STATE_IDLE
&& cpu_to_hc32(ehci, qtd->qtd_dma)
- == qh->hw_current) {
- token = hc32_to_cpu(ehci, qh->hw_token);
+ == hw->hw_current) {
+ token = hc32_to_cpu(ehci, hw->hw_token);
/* An unlink may leave an incomplete
* async transaction in the TT buffer.
* patch the qh later and so that completions can't
* activate it while we "know" it's stopped.
*/
- if ((halt & qh->hw_token) == 0) {
+ if ((halt & hw->hw_token) == 0) {
halt:
- qh->hw_token |= halt;
+ hw->hw_token |= halt;
wmb ();
}
}
* we must clear the TT buffer (11.17.5).
*/
if (unlikely(last_status != -EINPROGRESS &&
- last_status != -EREMOTEIO))
- ehci_clear_tt_buffer(ehci, qh, urb, token);
+ last_status != -EREMOTEIO)) {
+ /* The TT's in some hubs malfunction when they
+ * receive this request following a STALL (they
+ * stop sending isochronous packets). Since a
+ * STALL can't leave the TT buffer in a busy
+ * state (if you believe Figures 11-48 - 11-51
+ * in the USB 2.0 spec), we won't clear the TT
+ * buffer in this case. Strictly speaking this
+ * is a violation of the spec.
+ */
+ if (last_status != -EPIPE)
+ ehci_clear_tt_buffer(ehci, qh, urb,
+ token);
+ }
}
/* if we're removing something not at the queue head,
last = qtd;
/* reinit the xacterr counter for the next qtd */
- qh->xacterrs = QH_XACTERR_MAX;
+ qh->xacterrs = 0;
}
/* last urb's completion might still need calling */
ehci_qtd_free (ehci, last);
}
+ /* Do we need to rescan for URBs dequeued during a giveback? */
+ if (unlikely(qh->needs_rescan)) {
+ /* If the QH is already unlinked, do the rescan now. */
+ if (state == QH_STATE_IDLE)
+ goto rescan;
+
+ /* Otherwise we have to wait until the QH is fully unlinked.
+ * Our caller will start an unlink if qh->needs_rescan is
+ * set. But if an unlink has already started, nothing needs
+ * to be done.
+ */
+ if (state != QH_STATE_LINKED)
+ qh->needs_rescan = 0;
+ }
+
/* restore original state; caller must unlink or relink */
qh->qh_state = state;
* it after fault cleanup, or recovering from silicon wrongly
* overlaying the dummy qtd (which reduces DMA chatter).
*/
- if (stopped != 0 || qh->hw_qtd_next == EHCI_LIST_END(ehci)) {
+ if (stopped != 0 || hw->hw_qtd_next == EHCI_LIST_END(ehci)) {
switch (state) {
case QH_STATE_IDLE:
qh_refresh(ehci, qh);
* That should be rare for interrupt transfers,
* except maybe high bandwidth ...
*/
- if ((cpu_to_hc32(ehci, QH_SMASK)
- & qh->hw_info2) != 0) {
- intr_deschedule (ehci, qh);
- (void) qh_schedule (ehci, qh);
- } else
- unlink_async (ehci, qh);
+
+ /* Tell the caller to start an unlink */
+ qh->needs_rescan = 1;
break;
/* otherwise, unlink already started */
}
) {
struct ehci_qtd *qtd, *qtd_prev;
dma_addr_t buf;
- int len, maxpacket;
+ int len, this_sg_len, maxpacket;
int is_input;
u32 token;
+ int i;
+ struct scatterlist *sg;
/*
* URBs map to sequences of QTDs: one logical transaction
/*
* data transfer stage: buffer setup
*/
- buf = urb->transfer_dma;
+ i = urb->num_sgs;
+ if (len > 0 && i > 0) {
+ sg = urb->sg->sg;
+ buf = sg_dma_address(sg);
+
+ /* urb->transfer_buffer_length may be smaller than the
+ * size of the scatterlist (or vice versa)
+ */
+ this_sg_len = min_t(int, sg_dma_len(sg), len);
+ } else {
+ sg = NULL;
+ buf = urb->transfer_dma;
+ this_sg_len = len;
+ }
if (is_input)
token |= (1 /* "in" */ << 8);
for (;;) {
int this_qtd_len;
- this_qtd_len = qtd_fill(ehci, qtd, buf, len, token, maxpacket);
+ this_qtd_len = qtd_fill(ehci, qtd, buf, this_sg_len, token,
+ maxpacket);
+ this_sg_len -= this_qtd_len;
len -= this_qtd_len;
buf += this_qtd_len;
* (this will usually be overridden later.)
*/
if (is_input)
- qtd->hw_alt_next = ehci->async->hw_alt_next;
+ qtd->hw_alt_next = ehci->async->hw->hw_alt_next;
/* qh makes control packets use qtd toggle; maybe switch it */
if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
token ^= QTD_TOGGLE;
- if (likely (len <= 0))
- break;
+ if (likely(this_sg_len <= 0)) {
+ if (--i <= 0 || len <= 0)
+ break;
+ sg = sg_next(sg);
+ buf = sg_dma_address(sg);
+ this_sg_len = min_t(int, sg_dma_len(sg), len);
+ }
qtd_prev = qtd;
qtd = ehci_qtd_alloc (ehci, flags);
int is_input, type;
int maxp = 0;
struct usb_tt *tt = urb->dev->tt;
+ struct ehci_qh_hw *hw;
if (!qh)
return qh;
* But interval 1 scheduling is simpler, and
* includes high bandwidth.
*/
- dbg ("intr period %d uframes, NYET!",
- urb->interval);
- goto done;
+ urb->interval = 1;
+ } else if (qh->period > ehci->periodic_size) {
+ qh->period = ehci->periodic_size;
+ urb->interval = qh->period << 3;
}
} else {
int think_time;
usb_calc_bus_time (urb->dev->speed,
is_input, 0, max_packet (maxp)));
qh->period = urb->interval;
+ if (qh->period > ehci->periodic_size) {
+ qh->period = ehci->periodic_size;
+ urb->interval = qh->period;
+ }
}
}
/* init as live, toggle clear, advance to dummy */
qh->qh_state = QH_STATE_IDLE;
- qh->hw_info1 = cpu_to_hc32(ehci, info1);
- qh->hw_info2 = cpu_to_hc32(ehci, info2);
+ hw = qh->hw;
+ hw->hw_info1 = cpu_to_hc32(ehci, info1);
+ hw->hw_info2 = cpu_to_hc32(ehci, info2);
usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1);
qh_refresh (ehci, qh);
return qh;
if (unlikely(qh->clearing_tt))
return;
+ WARN_ON(qh->qh_state != QH_STATE_IDLE);
+
/* (re)start the async schedule? */
head = ehci->async;
timer_action_done (ehci, TIMER_ASYNC_OFF);
}
/* clear halt and/or toggle; and maybe recover from silicon quirk */
- if (qh->qh_state == QH_STATE_IDLE)
- qh_refresh (ehci, qh);
+ qh_refresh(ehci, qh);
/* splice right after start */
qh->qh_next = head->qh_next;
- qh->hw_next = head->hw_next;
+ qh->hw->hw_next = head->hw->hw_next;
wmb ();
head->qh_next.qh = qh;
- head->hw_next = dma;
+ head->hw->hw_next = dma;
- qh->xacterrs = QH_XACTERR_MAX;
+ qh_get(qh);
+ qh->xacterrs = 0;
qh->qh_state = QH_STATE_LINKED;
/* qtd completions reported later by interrupt */
}
/* usb_reset_device() briefly reverts to address 0 */
if (usb_pipedevice (urb->pipe) == 0)
- qh->hw_info1 &= ~qh_addr_mask;
+ qh->hw->hw_info1 &= ~qh_addr_mask;
}
/* just one way to queue requests: swap with the dummy qtd.
* the HC and TT handle it when the TT has a buffer ready.
*/
if (likely (qh->qh_state == QH_STATE_IDLE))
- qh_link_async (ehci, qh_get (qh));
+ qh_link_async(ehci, qh);
done:
spin_unlock_irqrestore (&ehci->lock, flags);
if (unlikely (qh == NULL))
&& HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
qh_link_async (ehci, qh);
else {
- qh_put (qh); // refcount from async list
-
/* it's not free to turn the async schedule on/off; leave it
* active but idle for a while once it empties.
*/
&& ehci->async->qh_next.qh == NULL)
timer_action (ehci, TIMER_ASYNC_OFF);
}
+ qh_put(qh); /* refcount from async list */
if (next) {
ehci->reclaim = NULL;
while (prev->qh_next.qh != qh)
prev = prev->qh_next.qh;
- prev->hw_next = qh->hw_next;
+ prev->hw->hw_next = qh->hw->hw_next;
prev->qh_next = qh->qh_next;
wmb ();
qh = qh_get (qh);
qh->stamp = ehci->stamp;
temp = qh_completions (ehci, qh);
+ if (qh->needs_rescan)
+ unlink_async(ehci, qh);
qh_put (qh);
if (temp != 0) {
goto rescan;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff