USB: EHCI: create a "periodic schedule info" struct

This patch begins the process of unifying the scheduling parameters
that ehci-hcd uses for interrupt and isochronous transfers.  It
creates an ehci_per_sched structure, which will be stored in both
ehci_qh and ehci_iso_stream structures, and will contain the common
scheduling information needed for both.

Initially we merely create the new structure and move some existing
fields into it.  Later patches will add more fields and utilize these
structures in improved scheduling algorithms.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 84 insertions, 83 deletions

diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 37e97a70894a..1fafcda0ae81 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -121,11 +121,11 @@ periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe)
 			hw = q->qh->hw;
 			/* is it in the S-mask? */
 			if (hw->hw_info2 & cpu_to_hc32(ehci, 1 << uframe))
-				usecs += q->qh->usecs;
+				usecs += q->qh->ps.usecs;
 			/* ... or C-mask? */
 			if (hw->hw_info2 & cpu_to_hc32(ehci,
 					1 << (8 + uframe)))
-				usecs += q->qh->c_usecs;
+				usecs += q->qh->ps.c_usecs;
 			hw_p = &hw->hw_next;
 			q = &q->qh->qh_next;
 			break;
@@ -142,7 +142,7 @@ periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe)
 			break;
 		case Q_TYPE_ITD:
 			if (q->itd->hw_transaction[uframe])
-				usecs += q->itd->stream->usecs;
+				usecs += q->itd->stream->ps.usecs;
 			hw_p = &q->itd->hw_next;
 			q = &q->itd->itd_next;
 			break;
@@ -152,7 +152,7 @@ periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe)
 					1 << uframe)) {
 				if (q->sitd->hw_fullspeed_ep &
 						cpu_to_hc32(ehci, 1<<31))
-					usecs += q->sitd->stream->usecs;
+					usecs += q->sitd->stream->ps.usecs;
 				else	/* worst case for OUT start-split */
 					usecs += HS_USECS_ISO (188);
 			}
@@ -161,7 +161,7 @@ periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe)
 			if (q->sitd->hw_uframe &
 					cpu_to_hc32(ehci, 1 << (8 + uframe))) {
 				/* worst case for IN complete-split */
-				usecs += q->sitd->stream->c_usecs;
+				usecs += q->sitd->stream->ps.c_usecs;
 			}
 
 			hw_p = &q->sitd->hw_next;
@@ -258,9 +258,9 @@ periodic_tt_usecs (
 			q = &q->itd->itd_next;
 			continue;
 		case Q_TYPE_QH:
-			if (same_tt(dev, q->qh->dev)) {
+			if (same_tt(dev, q->qh->ps.udev)) {
 				uf = tt_start_uframe(ehci, q->qh->hw->hw_info2);
-				tt_usecs[uf] += q->qh->tt_usecs;
+				tt_usecs[uf] += q->qh->ps.tt_usecs;
 			}
 			hw_p = &q->qh->hw->hw_next;
 			q = &q->qh->qh_next;
@@ -268,7 +268,7 @@ periodic_tt_usecs (
 		case Q_TYPE_SITD:
 			if (same_tt(dev, q->sitd->urb->dev)) {
 				uf = tt_start_uframe(ehci, q->sitd->hw_uframe);
-				tt_usecs[uf] += q->sitd->stream->tt_usecs;
+				tt_usecs[uf] += q->sitd->stream->ps.tt_usecs;
 			}
 			hw_p = &q->sitd->hw_next;
 			q = &q->sitd->sitd_next;
@@ -391,7 +391,7 @@ static int tt_no_collision (
 				continue;
 			case Q_TYPE_QH:
 				hw = here.qh->hw;
-				if (same_tt (dev, here.qh->dev)) {
+				if (same_tt(dev, here.qh->ps.udev)) {
 					u32		mask;
 
 					mask = hc32_to_cpu(ehci,
@@ -471,19 +471,19 @@ static void disable_periodic(struct ehci_hcd *ehci)
 static void qh_link_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
 {
 	unsigned	i;
-	unsigned	period = qh->period;
+	unsigned	period = qh->ps.period;
 
-	dev_dbg (&qh->dev->dev,
+	dev_dbg(&qh->ps.udev->dev,
 		"link qh%d-%04x/%p start %d [%d/%d us]\n",
 		period, hc32_to_cpup(ehci, &qh->hw->hw_info2)
 			& (QH_CMASK | QH_SMASK),
-		qh, qh->start, qh->usecs, qh->c_usecs);
+		qh, qh->ps.phase, qh->ps.usecs, qh->ps.c_usecs);
 
 	/* high bandwidth, or otherwise every microframe */
 	if (period == 0)
 		period = 1;
 
-	for (i = qh->start; i < ehci->periodic_size; i += period) {
+	for (i = qh->ps.phase; i < ehci->periodic_size; i += period) {
 		union ehci_shadow	*prev = &ehci->pshadow[i];
 		__hc32			*hw_p = &ehci->periodic[i];
 		union ehci_shadow	here = *prev;
@@ -503,7 +503,7 @@ static void qh_link_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
 		 * enables sharing interior tree nodes
 		 */
 		while (here.ptr && qh != here.qh) {
-			if (qh->period > here.qh->period)
+			if (qh->ps.period > here.qh->ps.period)
 				break;
 			prev = &here.qh->qh_next;
 			hw_p = &here.qh->hw->hw_next;
@@ -523,10 +523,10 @@ static void qh_link_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
 	qh->xacterrs = 0;
 	qh->exception = 0;
 
-	/* update per-qh bandwidth for usbfs */
-	ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->period
-		? ((qh->usecs + qh->c_usecs) / qh->period)
-		: (qh->usecs * 8);
+	/* update per-qh bandwidth for debugfs */
+	ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->ps.period
+		? ((qh->ps.usecs + qh->ps.c_usecs) / qh->ps.period)
+		: (qh->ps.usecs * 8);
 
 	list_add(&qh->intr_node, &ehci->intr_qh_list);
 
@@ -556,22 +556,21 @@ static void qh_unlink_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
 	 */
 
 	/* high bandwidth, or otherwise part of every microframe */
-	if ((period = qh->period) == 0)
-		period = 1;
+	period = qh->ps.period ? : 1;
 
-	for (i = qh->start; i < ehci->periodic_size; i += period)
+	for (i = qh->ps.phase; i < ehci->periodic_size; i += period)
 		periodic_unlink (ehci, i, qh);
 
-	/* update per-qh bandwidth for usbfs */
-	ehci_to_hcd(ehci)->self.bandwidth_allocated -= qh->period
-		? ((qh->usecs + qh->c_usecs) / qh->period)
-		: (qh->usecs * 8);
+	/* update per-qh bandwidth for debugfs */
+	ehci_to_hcd(ehci)->self.bandwidth_allocated -= qh->ps.period
+		? ((qh->ps.usecs + qh->ps.c_usecs) / qh->ps.period)
+		: (qh->ps.usecs * 8);
 
-	dev_dbg (&qh->dev->dev,
+	dev_dbg(&qh->ps.udev->dev,
 		"unlink qh%d-%04x/%p start %d [%d/%d us]\n",
-		qh->period,
+		qh->ps.period,
 		hc32_to_cpup(ehci, &qh->hw->hw_info2) & (QH_CMASK | QH_SMASK),
-		qh, qh->start, qh->usecs, qh->c_usecs);
+		qh, qh->ps.phase, qh->ps.usecs, qh->ps.c_usecs);
 
 	/* qh->qh_next still "live" to HC */
 	qh->qh_state = QH_STATE_UNLINK;
@@ -744,26 +743,26 @@ static int check_intr_schedule (
 	int		retval = -ENOSPC;
 	u8		mask = 0;
 
-	if (qh->c_usecs && uframe >= 6)		/* FSTN territory? */
+	if (qh->ps.c_usecs && uframe >= 6)	/* FSTN territory? */
 		goto done;
 
-	if (!check_period (ehci, frame, uframe, qh->period, qh->usecs))
+	if (!check_period(ehci, frame, uframe, qh->ps.period, qh->ps.usecs))
 		goto done;
-	if (!qh->c_usecs) {
+	if (!qh->ps.c_usecs) {
 		retval = 0;
 		*c_maskp = 0;
 		goto done;
 	}
 
 #ifdef CONFIG_USB_EHCI_TT_NEWSCHED
-	if (tt_available (ehci, qh->period, qh->dev, frame, uframe,
-				qh->tt_usecs)) {
+	if (tt_available(ehci, qh->ps.period, qh->ps.udev, frame, uframe,
+				qh->ps.tt_usecs)) {
 		unsigned i;
 
 		/* TODO : this may need FSTN for SSPLIT in uframe 5. */
 		for (i = uframe+2; i < 8 && i <= uframe+4; i++)
-			if (!check_period (ehci, frame, i,
-						qh->period, qh->c_usecs))
+			if (!check_period(ehci, frame, i,
+					qh->ps.period, qh->ps.c_usecs))
 				goto done;
 			else
 				mask |= 1 << i;
@@ -784,12 +783,12 @@ static int check_intr_schedule (
 	*c_maskp = cpu_to_hc32(ehci, mask << 8);
 
 	mask |= 1 << uframe;
-	if (tt_no_collision (ehci, qh->period, qh->dev, frame, mask)) {
-		if (!check_period (ehci, frame, uframe + qh->gap_uf + 1,
-					qh->period, qh->c_usecs))
+	if (tt_no_collision(ehci, qh->ps.period, qh->ps.udev, frame, mask)) {
+		if (!check_period(ehci, frame, uframe + qh->gap_uf + 1,
+				qh->ps.period, qh->ps.c_usecs))
 			goto done;
-		if (!check_period (ehci, frame, uframe + qh->gap_uf,
-					qh->period, qh->c_usecs))
+		if (!check_period(ehci, frame, uframe + qh->gap_uf,
+				qh->ps.period, qh->ps.c_usecs))
 			goto done;
 		retval = 0;
 	}
@@ -810,7 +809,7 @@ static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
 	struct ehci_qh_hw	*hw = qh->hw;
 
 	hw->hw_next = EHCI_LIST_END(ehci);
-	frame = qh->start;
+	frame = qh->ps.phase;
 
 	/* reuse the previous schedule slots, if we can */
 	if (frame != NO_FRAME) {
@@ -828,11 +827,11 @@ static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
 	 */
 	if (status) {
 		/* "normal" case, uframing flexible except with splits */
-		if (qh->period) {
+		if (qh->ps.period) {
 			int		i;
 
-			for (i = qh->period; status && i > 0; --i) {
-				frame = ++ehci->random_frame % qh->period;
+			for (i = qh->ps.period; status && i > 0; --i) {
+				frame = ++ehci->random_frame % qh->ps.period;
 				for (uframe = 0; uframe < 8; uframe++) {
 					status = check_intr_schedule (ehci,
 							frame, uframe, qh,
@@ -842,18 +841,18 @@ static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
 				}
 			}
 
-		/* qh->period == 0 means every uframe */
+		/* qh->ps.period == 0 means every uframe */
 		} else {
 			frame = 0;
 			status = check_intr_schedule (ehci, 0, 0, qh, &c_mask);
 		}
 		if (status)
 			goto done;
-		qh->start = frame;
+		qh->ps.phase = frame;
 
 		/* reset S-frame and (maybe) C-frame masks */
 		hw->hw_info2 &= cpu_to_hc32(ehci, ~(QH_CMASK | QH_SMASK));
-		hw->hw_info2 |= qh->period
+		hw->hw_info2 |= qh->ps.period
 			? cpu_to_hc32(ehci, 1 << uframe)
 			: cpu_to_hc32(ehci, QH_SMASK);
 		hw->hw_info2 |= c_mask;
@@ -978,25 +977,24 @@ static void
 iso_stream_init (
 	struct ehci_hcd		*ehci,
 	struct ehci_iso_stream	*stream,
-	struct usb_device	*dev,
-	int			pipe,
-	unsigned		interval
+	struct urb		*urb
 )
 {
 	static const u8 smask_out [] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f };
 
+	struct usb_device	*dev = urb->dev;
+	unsigned		interval = urb->interval;
 	u32			buf1;
 	unsigned		epnum, maxp;
 	int			is_input;
-	long			bandwidth;
 
 	/*
 	 * this might be a "high bandwidth" highspeed endpoint,
 	 * as encoded in the ep descriptor's wMaxPacket field
 	 */
-	epnum = usb_pipeendpoint (pipe);
-	is_input = usb_pipein (pipe) ? USB_DIR_IN : 0;
-	maxp = usb_maxpacket(dev, pipe, !is_input);
+	epnum = usb_pipeendpoint(urb->pipe);
+	is_input = usb_pipein(urb->pipe) ? USB_DIR_IN : 0;
+	maxp = usb_endpoint_maxp(&urb->ep->desc);
 	if (is_input) {
 		buf1 = (1 << 11);
 	} else {
@@ -1020,9 +1018,11 @@ iso_stream_init (
 		/* usbfs wants to report the average usecs per frame tied up
 		 * when transfers on this endpoint are scheduled ...
 		 */
-		stream->usecs = HS_USECS_ISO (maxp);
-		bandwidth = stream->usecs * 8;
-		bandwidth /= interval;
+		stream->ps.usecs = HS_USECS_ISO(maxp);
+
+		stream->bandwidth = stream->ps.usecs * 8 / interval;
+		stream->uperiod = interval;
+		stream->ps.period = interval >> 3;
 
 	} else {
 		u32		addr;
@@ -1036,17 +1036,17 @@ iso_stream_init (
 			addr |= dev->tt->hub->devnum << 16;
 		addr |= epnum << 8;
 		addr |= dev->devnum;
-		stream->usecs = HS_USECS_ISO (maxp);
+		stream->ps.usecs = HS_USECS_ISO(maxp);
 		think_time = dev->tt ? dev->tt->think_time : 0;
-		stream->tt_usecs = NS_TO_US (think_time + usb_calc_bus_time (
+		stream->ps.tt_usecs = NS_TO_US(think_time + usb_calc_bus_time(
 				dev->speed, is_input, 1, maxp));
 		hs_transfers = max (1u, (maxp + 187) / 188);
 		if (is_input) {
 			u32	tmp;
 
 			addr |= 1 << 31;
-			stream->c_usecs = stream->usecs;
-			stream->usecs = HS_USECS_ISO (1);
+			stream->ps.c_usecs = stream->ps.usecs;
+			stream->ps.usecs = HS_USECS_ISO(1);
 			stream->raw_mask = 1;
 
 			/* c-mask as specified in USB 2.0 11.18.4 3.c */
@@ -1054,18 +1054,20 @@ iso_stream_init (
 			stream->raw_mask |= tmp << (8 + 2);
 		} else
 			stream->raw_mask = smask_out [hs_transfers - 1];
-		bandwidth = stream->usecs + stream->c_usecs;
-		bandwidth /= interval;
+
+		stream->bandwidth = (stream->ps.usecs + stream->ps.c_usecs) /
+				interval;
+		stream->uperiod = interval << 3;
+		stream->ps.period = interval;
 
 		/* stream->splits gets created from raw_mask later */
 		stream->address = cpu_to_hc32(ehci, addr);
 	}
-	stream->bandwidth = bandwidth;
 
-	stream->udev = dev;
+	stream->ps.udev = dev;
+	stream->ps.ep = urb->ep;
 
 	stream->bEndpointAddress = is_input | epnum;
-	stream->interval = interval;
 	stream->maxp = maxp;
 }
 
@@ -1090,9 +1092,7 @@ iso_stream_find (struct ehci_hcd *ehci, struct urb *urb)
 		stream = iso_stream_alloc(GFP_ATOMIC);
 		if (likely (stream != NULL)) {
 			ep->hcpriv = stream;
-			stream->ep = ep;
-			iso_stream_init(ehci, stream, urb->dev, urb->pipe,
-					urb->interval);
+			iso_stream_init(ehci, stream, urb);
 		}
 
 	/* if dev->ep [epnum] is a QH, hw is set */
@@ -1137,7 +1137,7 @@ itd_sched_init(
 	dma_addr_t	dma = urb->transfer_dma;
 
 	/* how many uframes are needed for these transfers */
-	iso_sched->span = urb->number_of_packets * stream->interval;
+	iso_sched->span = urb->number_of_packets * stream->uperiod;
 
 	/* figure out per-uframe itd fields that we'll need later
 	 * when we fit new itds into the schedule.
@@ -1304,14 +1304,14 @@ sitd_slot_ok (
 	 */
 	uf = uframe & 7;
 	if (!tt_available(ehci, period_uframes >> 3,
-			stream->udev, frame, uf, stream->tt_usecs))
+			stream->ps.udev, frame, uf, stream->ps.tt_usecs))
 		return 0;
 #else
 	/* tt must be idle for start(s), any gap, and csplit.
 	 * assume scheduling slop leaves 10+% for control/bulk.
 	 */
 	if (!tt_no_collision(ehci, period_uframes >> 3,
-			stream->udev, frame, mask))
+			stream->ps.udev, frame, mask))
 		return 0;
 #endif
 
@@ -1325,16 +1325,17 @@ sitd_slot_ok (
 		uf = uframe & 7;
 
 		/* check starts (OUT uses more than one) */
-		max_used = ehci->uframe_periodic_max - stream->usecs;
+		max_used = ehci->uframe_periodic_max - stream->ps.usecs;
 		for (tmp = stream->raw_mask & 0xff; tmp; tmp >>= 1, uf++) {
 			if (periodic_usecs (ehci, frame, uf) > max_used)
 				return 0;
 		}
 
 		/* for IN, check CSPLIT */
-		if (stream->c_usecs) {
+		if (stream->ps.c_usecs) {
 			uf = uframe & 7;
-			max_used = ehci->uframe_periodic_max - stream->c_usecs;
+			max_used = ehci->uframe_periodic_max -
+					stream->ps.c_usecs;
 			do {
 				tmp = 1 << uf;
 				tmp <<= 8;
@@ -1428,7 +1429,7 @@ iso_stream_schedule (
 			/* check schedule: enough space? */
 			if (stream->highspeed) {
 				if (itd_slot_ok(ehci, mod, start,
-						stream->usecs, period))
+						stream->ps.usecs, period))
 					done = 1;
 			} else {
 				if ((start % 8) >= 6)
@@ -1668,7 +1669,7 @@ static void itd_link_urb(
 
 		itd_patch(ehci, itd, iso_sched, packet, uframe);
 
-		next_uframe += stream->interval;
+		next_uframe += stream->uperiod;
 		next_uframe &= mod - 1;
 		packet++;
 
@@ -1808,9 +1809,9 @@ static int itd_submit (struct ehci_hcd *ehci, struct urb *urb,
 		ehci_dbg (ehci, "can't get iso stream\n");
 		return -ENOMEM;
 	}
-	if (unlikely (urb->interval != stream->interval)) {
+	if (unlikely(urb->interval != stream->uperiod)) {
 		ehci_dbg (ehci, "can't change iso interval %d --> %d\n",
-			stream->interval, urb->interval);
+			stream->uperiod, urb->interval);
 		goto done;
 	}
 
@@ -1875,7 +1876,7 @@ sitd_sched_init(
 	dma_addr_t	dma = urb->transfer_dma;
 
 	/* how many frames are needed for these transfers */
-	iso_sched->span = urb->number_of_packets * stream->interval;
+	iso_sched->span = urb->number_of_packets * stream->ps.period;
 
 	/* figure out per-frame sitd fields that we'll need later
 	 * when we fit new sitds into the schedule.
@@ -2069,7 +2070,7 @@ static void sitd_link_urb(
 		sitd_link(ehci, (next_uframe >> 3) & (ehci->periodic_size - 1),
 				sitd);
 
-		next_uframe += stream->interval << 3;
+		next_uframe += stream->uperiod;
 	}
 	stream->next_uframe = next_uframe & (mod - 1);
 
@@ -2188,9 +2189,9 @@ static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb,
 		ehci_dbg (ehci, "can't get iso stream\n");
 		return -ENOMEM;
 	}
-	if (urb->interval != stream->interval) {
+	if (urb->interval != stream->ps.period) {
 		ehci_dbg (ehci, "can't change iso interval %d --> %d\n",
-			stream->interval, urb->interval);
+			stream->ps.period, urb->interval);
 		goto done;
 	}