[PATCH] UHCI: use one QH per endpoint, not per URB
This patch (as623) changes the uhci-hcd driver to make it use one QH per
device endpoint, instead of a QH per URB as it does now. Numerous areas
of the code are affected by this. For example, the distinction between
"queued" URBs and non-"queued" URBs no longer exists; all URBs belong to
a queue and some just happen to be at the queue's head.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
index 5832953..3faccbd 100644
--- a/drivers/usb/host/uhci-debug.c
+++ b/drivers/usb/host/uhci-debug.c
@@ -90,13 +90,60 @@
return out - buf;
}
+static int uhci_show_urbp(struct urb_priv *urbp, char *buf, int len, int space)
+{
+ char *out = buf;
+ struct uhci_td *td;
+ int i, nactive, ninactive;
+
+ if (len < 200)
+ return 0;
+
+ out += sprintf(out, "urb_priv [%p] ", urbp);
+ out += sprintf(out, "urb [%p] ", urbp->urb);
+ out += sprintf(out, "qh [%p] ", urbp->qh);
+ out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
+ out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
+ (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));
+
+ switch (usb_pipetype(urbp->urb->pipe)) {
+ case PIPE_ISOCHRONOUS: out += sprintf(out, "ISO"); break;
+ case PIPE_INTERRUPT: out += sprintf(out, "INT"); break;
+ case PIPE_BULK: out += sprintf(out, "BLK"); break;
+ case PIPE_CONTROL: out += sprintf(out, "CTL"); break;
+ }
+
+ out += sprintf(out, "%s", (urbp->fsbr ? " FSBR" : ""));
+ out += sprintf(out, "%s", (urbp->fsbr_timeout ? " FSBR_TO" : ""));
+
+ if (urbp->urb->status != -EINPROGRESS)
+ out += sprintf(out, " Status=%d", urbp->urb->status);
+ out += sprintf(out, "\n");
+
+ i = nactive = ninactive = 0;
+ list_for_each_entry(td, &urbp->td_list, list) {
+ if (++i <= 10 || debug > 2) {
+ out += sprintf(out, "%*s%d: ", space + 2, "", i);
+ out += uhci_show_td(td, out, len - (out - buf), 0);
+ } else {
+ if (td_status(td) & TD_CTRL_ACTIVE)
+ ++nactive;
+ else
+ ++ninactive;
+ }
+ }
+ if (nactive + ninactive > 0)
+ out += sprintf(out, "%*s[skipped %d inactive and %d active "
+ "TDs]\n",
+ space, "", ninactive, nactive);
+
+ return out - buf;
+}
+
static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space)
{
char *out = buf;
- struct urb_priv *urbp;
- struct list_head *head, *tmp;
- struct uhci_td *td;
- int i = 0, checked = 0, prevactive = 0;
+ int i, nurbs;
__le32 element = qh_element(qh);
/* Try to make sure there's enough memory */
@@ -118,86 +165,36 @@
if (!(element & ~(UHCI_PTR_QH | UHCI_PTR_DEPTH)))
out += sprintf(out, "%*s Element is NULL (bug?)\n", space, "");
- if (!qh->urbp) {
- out += sprintf(out, "%*s urbp == NULL\n", space, "");
- goto out;
- }
+ if (list_empty(&qh->queue)) {
+ out += sprintf(out, "%*s queue is empty\n", space, "");
+ } else {
+ struct urb_priv *urbp = list_entry(qh->queue.next,
+ struct urb_priv, node);
+ struct uhci_td *td = list_entry(urbp->td_list.next,
+ struct uhci_td, list);
- urbp = qh->urbp;
-
- head = &urbp->td_list;
- tmp = head->next;
-
- td = list_entry(tmp, struct uhci_td, list);
-
- if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS))
- out += sprintf(out, "%*s Element != First TD\n", space, "");
-
- while (tmp != head) {
- struct uhci_td *td = list_entry(tmp, struct uhci_td, list);
-
- tmp = tmp->next;
-
- out += sprintf(out, "%*s%d: ", space + 2, "", i++);
- out += uhci_show_td(td, out, len - (out - buf), 0);
-
- if (i > 10 && !checked && prevactive && tmp != head &&
- debug <= 2) {
- struct list_head *ntmp = tmp;
- struct uhci_td *ntd = td;
- int active = 1, ni = i;
-
- checked = 1;
-
- while (ntmp != head && ntmp->next != head && active) {
- ntd = list_entry(ntmp, struct uhci_td, list);
-
- ntmp = ntmp->next;
-
- active = td_status(ntd) & TD_CTRL_ACTIVE;
-
- ni++;
- }
-
- if (active && ni > i) {
- out += sprintf(out, "%*s[skipped %d active TDs]\n", space, "", ni - i);
- tmp = ntmp;
- td = ntd;
- i = ni;
- }
+ if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS))
+ out += sprintf(out, "%*s Element != First TD\n",
+ space, "");
+ i = nurbs = 0;
+ list_for_each_entry(urbp, &qh->queue, node) {
+ if (++i <= 10)
+ out += uhci_show_urbp(urbp, out,
+ len - (out - buf), space + 2);
+ else
+ ++nurbs;
}
-
- prevactive = td_status(td) & TD_CTRL_ACTIVE;
+ if (nurbs > 0)
+ out += sprintf(out, "%*s Skipped %d URBs\n",
+ space, "", nurbs);
}
- if (list_empty(&urbp->queue_list) || urbp->queued)
- goto out;
-
- out += sprintf(out, "%*sQueued QHs:\n", -space, "--");
-
- head = &urbp->queue_list;
- tmp = head->next;
-
- while (tmp != head) {
- struct urb_priv *nurbp = list_entry(tmp, struct urb_priv,
- queue_list);
- tmp = tmp->next;
-
- out += uhci_show_qh(nurbp->qh, out, len - (out - buf), space);
- }
-
-out:
return out - buf;
}
-#define show_frame_num() \
- if (!shown) { \
- shown = 1; \
- out += sprintf(out, "- Frame %d\n", i); \
- }
-
#ifdef CONFIG_PROC_FS
static const char * const qh_names[] = {
+ "skel_unlink_qh", "skel_iso_qh",
"skel_int128_qh", "skel_int64_qh",
"skel_int32_qh", "skel_int16_qh",
"skel_int8_qh", "skel_int4_qh",
@@ -206,12 +203,6 @@
"skel_bulk_qh", "skel_term_qh"
};
-#define show_qh_name() \
- if (!shown) { \
- shown = 1; \
- out += sprintf(out, "- %s\n", qh_names[i]); \
- }
-
static int uhci_show_sc(int port, unsigned short status, char *buf, int len)
{
char *out = buf;
@@ -321,139 +312,29 @@
return out - buf;
}
-static int uhci_show_urbp(struct uhci_hcd *uhci, struct urb_priv *urbp, char *buf, int len)
-{
- struct list_head *tmp;
- char *out = buf;
- int count = 0;
-
- if (len < 200)
- return 0;
-
- out += sprintf(out, "urb_priv [%p] ", urbp);
- out += sprintf(out, "urb [%p] ", urbp->urb);
- out += sprintf(out, "qh [%p] ", urbp->qh);
- out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
- out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe), (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));
-
- switch (usb_pipetype(urbp->urb->pipe)) {
- case PIPE_ISOCHRONOUS: out += sprintf(out, "ISO "); break;
- case PIPE_INTERRUPT: out += sprintf(out, "INT "); break;
- case PIPE_BULK: out += sprintf(out, "BLK "); break;
- case PIPE_CONTROL: out += sprintf(out, "CTL "); break;
- }
-
- out += sprintf(out, "%s", (urbp->fsbr ? "FSBR " : ""));
- out += sprintf(out, "%s", (urbp->fsbr_timeout ? "FSBR_TO " : ""));
-
- if (urbp->urb->status != -EINPROGRESS)
- out += sprintf(out, "Status=%d ", urbp->urb->status);
- //out += sprintf(out, "FSBRtime=%lx ",urbp->fsbrtime);
-
- count = 0;
- list_for_each(tmp, &urbp->td_list)
- count++;
- out += sprintf(out, "TDs=%d ",count);
-
- if (urbp->queued)
- out += sprintf(out, "queued\n");
- else {
- count = 0;
- list_for_each(tmp, &urbp->queue_list)
- count++;
- out += sprintf(out, "queued URBs=%d\n", count);
- }
-
- return out - buf;
-}
-
-static int uhci_show_lists(struct uhci_hcd *uhci, char *buf, int len)
-{
- char *out = buf;
- struct list_head *head, *tmp;
- int count;
-
- out += sprintf(out, "Main list URBs:");
- if (list_empty(&uhci->urb_list))
- out += sprintf(out, " Empty\n");
- else {
- out += sprintf(out, "\n");
- count = 0;
- head = &uhci->urb_list;
- tmp = head->next;
- while (tmp != head) {
- struct urb_priv *urbp = list_entry(tmp, struct urb_priv, urb_list);
-
- out += sprintf(out, " %d: ", ++count);
- out += uhci_show_urbp(uhci, urbp, out, len - (out - buf));
- tmp = tmp->next;
- }
- }
-
- out += sprintf(out, "Remove list URBs:");
- if (list_empty(&uhci->urb_remove_list))
- out += sprintf(out, " Empty\n");
- else {
- out += sprintf(out, "\n");
- count = 0;
- head = &uhci->urb_remove_list;
- tmp = head->next;
- while (tmp != head) {
- struct urb_priv *urbp = list_entry(tmp, struct urb_priv, urb_list);
-
- out += sprintf(out, " %d: ", ++count);
- out += uhci_show_urbp(uhci, urbp, out, len - (out - buf));
- tmp = tmp->next;
- }
- }
-
- out += sprintf(out, "Complete list URBs:");
- if (list_empty(&uhci->complete_list))
- out += sprintf(out, " Empty\n");
- else {
- out += sprintf(out, "\n");
- count = 0;
- head = &uhci->complete_list;
- tmp = head->next;
- while (tmp != head) {
- struct urb_priv *urbp = list_entry(tmp, struct urb_priv, urb_list);
-
- out += sprintf(out, " %d: ", ++count);
- out += uhci_show_urbp(uhci, urbp, out, len - (out - buf));
- tmp = tmp->next;
- }
- }
-
- return out - buf;
-}
-
static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
{
- unsigned long flags;
char *out = buf;
int i, j;
struct uhci_qh *qh;
struct uhci_td *td;
struct list_head *tmp, *head;
- spin_lock_irqsave(&uhci->lock, flags);
-
out += uhci_show_root_hub_state(uhci, out, len - (out - buf));
out += sprintf(out, "HC status\n");
out += uhci_show_status(uhci, out, len - (out - buf));
+ if (debug <= 1)
+ return out - buf;
out += sprintf(out, "Frame List\n");
for (i = 0; i < UHCI_NUMFRAMES; ++i) {
- int shown = 0;
td = uhci->frame_cpu[i];
if (!td)
continue;
- if (td->dma_handle != (dma_addr_t)uhci->frame[i]) {
- show_frame_num();
+ out += sprintf(out, "- Frame %d\n", i); \
+ if (td->dma_handle != (dma_addr_t)uhci->frame[i])
out += sprintf(out, " frame list does not match td->dma_handle!\n");
- }
- show_frame_num();
head = &td->fl_list;
tmp = head;
@@ -467,14 +348,11 @@
out += sprintf(out, "Skeleton QHs\n");
for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
- int shown = 0;
+ int cnt = 0;
qh = uhci->skelqh[i];
-
- if (debug > 1) {
- show_qh_name();
- out += uhci_show_qh(qh, out, len - (out - buf), 4);
- }
+ out += sprintf(out, "- %s\n", qh_names[i]); \
+ out += uhci_show_qh(qh, out, len - (out - buf), 4);
/* Last QH is the Terminating QH, it's different */
if (i == UHCI_NUM_SKELQH - 1) {
@@ -487,44 +365,27 @@
continue;
}
- j = (i < 7) ? 7 : i+1; /* Next skeleton */
- if (list_empty(&qh->list)) {
- if (i < UHCI_NUM_SKELQH - 1) {
- if (qh->link !=
- (cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH)) {
- show_qh_name();
- out += sprintf(out, " skeleton QH not linked to next skeleton QH!\n");
- }
- }
-
- continue;
- }
-
- show_qh_name();
-
- head = &qh->list;
+ j = (i < 9) ? 9 : i+1; /* Next skeleton */
+ head = &qh->node;
tmp = head->next;
while (tmp != head) {
- qh = list_entry(tmp, struct uhci_qh, list);
-
+ qh = list_entry(tmp, struct uhci_qh, node);
tmp = tmp->next;
-
- out += uhci_show_qh(qh, out, len - (out - buf), 4);
+ if (++cnt <= 10)
+ out += uhci_show_qh(qh, out,
+ len - (out - buf), 4);
}
+ if ((cnt -= 10) > 0)
+ out += sprintf(out, " Skipped %d QHs\n", cnt);
- if (i < UHCI_NUM_SKELQH - 1) {
+ if (i > 1 && i < UHCI_NUM_SKELQH - 1) {
if (qh->link !=
(cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH))
out += sprintf(out, " last QH not linked to next skeleton!\n");
}
}
- if (debug > 2)
- out += uhci_show_lists(uhci, out, len - (out - buf));
-
- spin_unlock_irqrestore(&uhci->lock, flags);
-
return out - buf;
}
@@ -541,6 +402,7 @@
struct uhci_hcd *uhci = inode->u.generic_ip;
struct uhci_debug *up;
int ret = -ENOMEM;
+ unsigned long flags;
lock_kernel();
up = kmalloc(sizeof(*up), GFP_KERNEL);
@@ -553,7 +415,9 @@
goto out;
}
+ spin_lock_irqsave(&uhci->lock, flags);
up->size = uhci_sprint_schedule(uhci, up->data, MAX_OUTPUT);
+ spin_unlock_irqrestore(&uhci->lock, flags);
file->private_data = up;
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index dfe121d..1ff4b88 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -54,7 +54,7 @@
/*
* Version Information
*/
-#define DRIVER_VERSION "v2.3"
+#define DRIVER_VERSION "v3.0"
#define DRIVER_AUTHOR "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, \
Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, Roman Weissgaerber, \
Alan Stern"
@@ -489,15 +489,11 @@
uhci->fsbrtimeout = 0;
spin_lock_init(&uhci->lock);
- INIT_LIST_HEAD(&uhci->qh_remove_list);
INIT_LIST_HEAD(&uhci->td_remove_list);
-
- INIT_LIST_HEAD(&uhci->urb_remove_list);
-
INIT_LIST_HEAD(&uhci->urb_list);
-
INIT_LIST_HEAD(&uhci->complete_list);
+ INIT_LIST_HEAD(&uhci->idle_qh_list);
init_waitqueue_head(&uhci->waitqh);
@@ -540,7 +536,7 @@
}
for (i = 0; i < UHCI_NUM_SKELQH; i++) {
- uhci->skelqh[i] = uhci_alloc_qh(uhci);
+ uhci->skelqh[i] = uhci_alloc_qh(uhci, NULL, NULL);
if (!uhci->skelqh[i]) {
dev_err(uhci_dev(uhci), "unable to allocate QH\n");
goto err_alloc_skelqh;
@@ -557,13 +553,17 @@
uhci->skel_int16_qh->link =
uhci->skel_int8_qh->link =
uhci->skel_int4_qh->link =
- uhci->skel_int2_qh->link =
- cpu_to_le32(uhci->skel_int1_qh->dma_handle) | UHCI_PTR_QH;
- uhci->skel_int1_qh->link = cpu_to_le32(uhci->skel_ls_control_qh->dma_handle) | UHCI_PTR_QH;
+ uhci->skel_int2_qh->link = UHCI_PTR_QH |
+ cpu_to_le32(uhci->skel_int1_qh->dma_handle);
- uhci->skel_ls_control_qh->link = cpu_to_le32(uhci->skel_fs_control_qh->dma_handle) | UHCI_PTR_QH;
- uhci->skel_fs_control_qh->link = cpu_to_le32(uhci->skel_bulk_qh->dma_handle) | UHCI_PTR_QH;
- uhci->skel_bulk_qh->link = cpu_to_le32(uhci->skel_term_qh->dma_handle) | UHCI_PTR_QH;
+ uhci->skel_int1_qh->link = UHCI_PTR_QH |
+ cpu_to_le32(uhci->skel_ls_control_qh->dma_handle);
+ uhci->skel_ls_control_qh->link = UHCI_PTR_QH |
+ cpu_to_le32(uhci->skel_fs_control_qh->dma_handle);
+ uhci->skel_fs_control_qh->link = UHCI_PTR_QH |
+ cpu_to_le32(uhci->skel_bulk_qh->dma_handle);
+ uhci->skel_bulk_qh->link = UHCI_PTR_QH |
+ cpu_to_le32(uhci->skel_term_qh->dma_handle);
/* This dummy TD is to work around a bug in Intel PIIX controllers */
uhci_fill_td(uhci->term_td, 0, uhci_explen(0) |
@@ -589,15 +589,15 @@
/*
* ffs (Find First bit Set) does exactly what we need:
- * 1,3,5,... => ffs = 0 => use skel_int2_qh = skelqh[6],
- * 2,6,10,... => ffs = 1 => use skel_int4_qh = skelqh[5], etc.
- * ffs > 6 => not on any high-period queue, so use
- * skel_int1_qh = skelqh[7].
+ * 1,3,5,... => ffs = 0 => use skel_int2_qh = skelqh[8],
+ * 2,6,10,... => ffs = 1 => use skel_int4_qh = skelqh[7], etc.
+ * ffs >= 7 => not on any high-period queue, so use
+ * skel_int1_qh = skelqh[9].
* Add UHCI_NUMFRAMES to insure at least one bit is set.
*/
- irq = 6 - (int) __ffs(i + UHCI_NUMFRAMES);
- if (irq < 0)
- irq = 7;
+ irq = 8 - (int) __ffs(i + UHCI_NUMFRAMES);
+ if (irq <= 1)
+ irq = 9;
/* Only place we don't use the frame list routines */
uhci->frame[i] = UHCI_PTR_QH |
@@ -767,13 +767,30 @@
}
#endif
-/* Wait until all the URBs for a particular device/endpoint are gone */
+/* Wait until a particular device/endpoint's QH is idle, and free it */
static void uhci_hcd_endpoint_disable(struct usb_hcd *hcd,
- struct usb_host_endpoint *ep)
+ struct usb_host_endpoint *hep)
{
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+ struct uhci_qh *qh;
- wait_event_interruptible(uhci->waitqh, list_empty(&ep->urb_list));
+ spin_lock_irq(&uhci->lock);
+ qh = (struct uhci_qh *) hep->hcpriv;
+ if (qh == NULL)
+ goto done;
+
+ while (qh->state != QH_STATE_IDLE) {
+ ++uhci->num_waiting;
+ spin_unlock_irq(&uhci->lock);
+ wait_event_interruptible(uhci->waitqh,
+ qh->state == QH_STATE_IDLE);
+ spin_lock_irq(&uhci->lock);
+ --uhci->num_waiting;
+ }
+
+ uhci_free_qh(uhci, qh);
+done:
+ spin_unlock_irq(&uhci->lock);
}
static int uhci_hcd_get_frame_number(struct usb_hcd *hcd)
diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h
index 8b4b887..7a9481c0 100644
--- a/drivers/usb/host/uhci-hcd.h
+++ b/drivers/usb/host/uhci-hcd.h
@@ -28,8 +28,9 @@
#define USBSTS_USBINT 0x0001 /* Interrupt due to IOC */
#define USBSTS_ERROR 0x0002 /* Interrupt due to error */
#define USBSTS_RD 0x0004 /* Resume Detect */
-#define USBSTS_HSE 0x0008 /* Host System Error - basically PCI problems */
-#define USBSTS_HCPE 0x0010 /* Host Controller Process Error - the scripts were buggy */
+#define USBSTS_HSE 0x0008 /* Host System Error: PCI problems */
+#define USBSTS_HCPE 0x0010 /* Host Controller Process Error:
+ * the schedule is buggy */
#define USBSTS_HCH 0x0020 /* HC Halted */
/* Interrupt enable register */
@@ -47,7 +48,8 @@
/* USB port status and control registers */
#define USBPORTSC1 16
#define USBPORTSC2 18
-#define USBPORTSC_CCS 0x0001 /* Current Connect Status ("device present") */
+#define USBPORTSC_CCS 0x0001 /* Current Connect Status
+ * ("device present") */
#define USBPORTSC_CSC 0x0002 /* Connect Status Change */
#define USBPORTSC_PE 0x0004 /* Port Enable */
#define USBPORTSC_PEC 0x0008 /* Port Enable Change */
@@ -71,15 +73,16 @@
#define USBLEGSUP_RWC 0x8f00 /* the R/WC bits */
#define USBLEGSUP_RO 0x5040 /* R/O and reserved bits */
-#define UHCI_PTR_BITS cpu_to_le32(0x000F)
-#define UHCI_PTR_TERM cpu_to_le32(0x0001)
-#define UHCI_PTR_QH cpu_to_le32(0x0002)
-#define UHCI_PTR_DEPTH cpu_to_le32(0x0004)
-#define UHCI_PTR_BREADTH cpu_to_le32(0x0000)
+#define UHCI_PTR_BITS __constant_cpu_to_le32(0x000F)
+#define UHCI_PTR_TERM __constant_cpu_to_le32(0x0001)
+#define UHCI_PTR_QH __constant_cpu_to_le32(0x0002)
+#define UHCI_PTR_DEPTH __constant_cpu_to_le32(0x0004)
+#define UHCI_PTR_BREADTH __constant_cpu_to_le32(0x0000)
#define UHCI_NUMFRAMES 1024 /* in the frame list [array] */
#define UHCI_MAX_SOF_NUMBER 2047 /* in an SOF packet */
-#define CAN_SCHEDULE_FRAMES 1000 /* how far future frames can be scheduled */
+#define CAN_SCHEDULE_FRAMES 1000 /* how far in the future frames
+ * can be scheduled */
/*
@@ -87,38 +90,54 @@
*/
/*
- * One role of a QH is to hold a queue of TDs for some endpoint. Each QH is
- * used with one URB, and qh->element (updated by the HC) is either:
- * - the next unprocessed TD for the URB, or
- * - UHCI_PTR_TERM (when there's no more traffic for this endpoint), or
- * - the QH for the next URB queued to the same endpoint.
+ * One role of a QH is to hold a queue of TDs for some endpoint. One QH goes
+ * with each endpoint, and qh->element (updated by the HC) is either:
+ * - the next unprocessed TD in the endpoint's queue, or
+ * - UHCI_PTR_TERM (when there's no more traffic for this endpoint).
*
* The other role of a QH is to serve as a "skeleton" framelist entry, so we
* can easily splice a QH for some endpoint into the schedule at the right
* place. Then qh->element is UHCI_PTR_TERM.
*
- * In the frame list, qh->link maintains a list of QHs seen by the HC:
+ * In the schedule, qh->link maintains a list of QHs seen by the HC:
* skel1 --> ep1-qh --> ep2-qh --> ... --> skel2 --> ...
+ *
+ * qh->node is the software equivalent of qh->link. The differences
+ * are that the software list is doubly-linked and QHs in the UNLINKING
+ * state are on the software list but not the hardware schedule.
+ *
+ * For bookkeeping purposes we maintain QHs even for Isochronous endpoints,
+ * but they never get added to the hardware schedule.
*/
+#define QH_STATE_IDLE 1 /* QH is not being used */
+#define QH_STATE_UNLINKING 2 /* QH has been removed from the
+ * schedule but the hardware may
+ * still be using it */
+#define QH_STATE_ACTIVE 3 /* QH is on the schedule */
+
struct uhci_qh {
/* Hardware fields */
- __le32 link; /* Next queue */
- __le32 element; /* Queue element pointer */
+ __le32 link; /* Next QH in the schedule */
+ __le32 element; /* Queue element (TD) pointer */
/* Software fields */
dma_addr_t dma_handle;
- struct urb_priv *urbp;
+ struct list_head node; /* Node in the list of QHs */
+ struct usb_host_endpoint *hep; /* Endpoint information */
+ struct usb_device *udev;
+ struct list_head queue; /* Queue of urbps for this QH */
+ struct uhci_qh *skel; /* Skeleton for this QH */
- struct list_head list;
- struct list_head remove_list;
+ unsigned int unlink_frame; /* When the QH was unlinked */
+ int state; /* QH_STATE_xxx; see above */
} __attribute__((aligned(16)));
/*
* We need a special accessor for the element pointer because it is
* subject to asynchronous updates by the controller.
*/
-static __le32 inline qh_element(struct uhci_qh *qh) {
+static inline __le32 qh_element(struct uhci_qh *qh) {
__le32 element = qh->element;
barrier();
@@ -149,11 +168,13 @@
#define TD_CTRL_ACTLEN_MASK 0x7FF /* actual length, encoded as n - 1 */
#define TD_CTRL_ANY_ERROR (TD_CTRL_STALLED | TD_CTRL_DBUFERR | \
- TD_CTRL_BABBLE | TD_CTRL_CRCTIME | TD_CTRL_BITSTUFF)
+ TD_CTRL_BABBLE | TD_CTRL_CRCTIME | \
+ TD_CTRL_BITSTUFF)
#define uhci_maxerr(err) ((err) << TD_CTRL_C_ERR_SHIFT)
#define uhci_status_bits(ctrl_sts) ((ctrl_sts) & 0xF60000)
-#define uhci_actual_length(ctrl_sts) (((ctrl_sts) + 1) & TD_CTRL_ACTLEN_MASK) /* 1-based */
+#define uhci_actual_length(ctrl_sts) (((ctrl_sts) + 1) & \
+ TD_CTRL_ACTLEN_MASK) /* 1-based */
/*
* for TD <info>: (a.k.a. Token)
@@ -163,7 +184,7 @@
#define TD_TOKEN_TOGGLE_SHIFT 19
#define TD_TOKEN_TOGGLE (1 << 19)
#define TD_TOKEN_EXPLEN_SHIFT 21
-#define TD_TOKEN_EXPLEN_MASK 0x7FF /* expected length, encoded as n - 1 */
+#define TD_TOKEN_EXPLEN_MASK 0x7FF /* expected length, encoded as n-1 */
#define TD_TOKEN_PID_MASK 0xFF
#define uhci_explen(len) ((((len) - 1) & TD_TOKEN_EXPLEN_MASK) << \
@@ -187,7 +208,7 @@
* sw space after the TD entry.
*
* td->link points to either another TD (not necessarily for the same urb or
- * even the same endpoint), or nothing (PTR_TERM), or a QH (for queued urbs).
+ * even the same endpoint), or nothing (PTR_TERM), or a QH.
*/
struct uhci_td {
/* Hardware fields */
@@ -210,7 +231,7 @@
* We need a special accessor for the control/status word because it is
* subject to asynchronous updates by the controller.
*/
-static u32 inline td_status(struct uhci_td *td) {
+static inline u32 td_status(struct uhci_td *td) {
__le32 status = td->status;
barrier();
@@ -223,17 +244,14 @@
*/
/*
- * The UHCI driver places Interrupt, Control and Bulk into QHs both
- * to group together TDs for one transfer, and also to facilitate queuing
- * of URBs. To make it easy to insert entries into the schedule, we have
- * a skeleton of QHs for each predefined Interrupt latency, low-speed
- * control, full-speed control and terminating QH (see explanation for
- * the terminating QH below).
+ * The UHCI driver uses QHs with Interrupt, Control and Bulk URBs for
+ * automatic queuing. To make it easy to insert entries into the schedule,
+ * we have a skeleton of QHs for each predefined Interrupt latency,
+ * low-speed control, full-speed control, bulk, and terminating QH
+ * (see explanation for the terminating QH below).
*
* When we want to add a new QH, we add it to the end of the list for the
- * skeleton QH.
- *
- * For instance, the queue can look like this:
+ * skeleton QH. For instance, the schedule list can look like this:
*
* skel int128 QH
* dev 1 interrupt QH
@@ -256,26 +274,31 @@
* - To loop back to the full-speed control queue for full-speed bandwidth
* reclamation.
*
- * Isochronous transfers are stored before the start of the skeleton
- * schedule and don't use QHs. While the UHCI spec doesn't forbid the
- * use of QHs for Isochronous, it doesn't use them either. And the spec
- * says that queues never advance on an error completion status, which
- * makes them totally unsuitable for Isochronous transfers.
+ * There's a special skeleton QH for Isochronous QHs. It never appears
+ * on the schedule, and Isochronous TDs go on the schedule before the
+ * the skeleton QHs. The hardware accesses them directly rather than
+ * through their QH, which is used only for bookkeeping purposes.
+ * While the UHCI spec doesn't forbid the use of QHs for Isochronous,
+ * it doesn't use them either. And the spec says that queues never
+ * advance on an error completion status, which makes them totally
+ * unsuitable for Isochronous transfers.
*/
-#define UHCI_NUM_SKELQH 12
-#define skel_int128_qh skelqh[0]
-#define skel_int64_qh skelqh[1]
-#define skel_int32_qh skelqh[2]
-#define skel_int16_qh skelqh[3]
-#define skel_int8_qh skelqh[4]
-#define skel_int4_qh skelqh[5]
-#define skel_int2_qh skelqh[6]
-#define skel_int1_qh skelqh[7]
-#define skel_ls_control_qh skelqh[8]
-#define skel_fs_control_qh skelqh[9]
-#define skel_bulk_qh skelqh[10]
-#define skel_term_qh skelqh[11]
+#define UHCI_NUM_SKELQH 14
+#define skel_unlink_qh skelqh[0]
+#define skel_iso_qh skelqh[1]
+#define skel_int128_qh skelqh[2]
+#define skel_int64_qh skelqh[3]
+#define skel_int32_qh skelqh[4]
+#define skel_int16_qh skelqh[5]
+#define skel_int8_qh skelqh[6]
+#define skel_int4_qh skelqh[7]
+#define skel_int2_qh skelqh[8]
+#define skel_int1_qh skelqh[9]
+#define skel_ls_control_qh skelqh[10]
+#define skel_fs_control_qh skelqh[11]
+#define skel_bulk_qh skelqh[12]
+#define skel_term_qh skelqh[13]
/*
* Search tree for determining where <interval> fits in the skelqh[]
@@ -293,21 +316,21 @@
if (interval < 16) {
if (interval < 4) {
if (interval < 2)
- return 7; /* int1 for 0-1 ms */
- return 6; /* int2 for 2-3 ms */
+ return 9; /* int1 for 0-1 ms */
+ return 8; /* int2 for 2-3 ms */
}
if (interval < 8)
- return 5; /* int4 for 4-7 ms */
- return 4; /* int8 for 8-15 ms */
+ return 7; /* int4 for 4-7 ms */
+ return 6; /* int8 for 8-15 ms */
}
if (interval < 64) {
if (interval < 32)
- return 3; /* int16 for 16-31 ms */
- return 2; /* int32 for 32-63 ms */
+ return 5; /* int16 for 16-31 ms */
+ return 4; /* int32 for 32-63 ms */
}
if (interval < 128)
- return 1; /* int64 for 64-127 ms */
- return 0; /* int128 for 128-255 ms (Max.) */
+ return 3; /* int64 for 64-127 ms */
+ return 2; /* int128 for 128-255 ms (Max.) */
}
@@ -363,12 +386,12 @@
spinlock_t lock;
- dma_addr_t frame_dma_handle; /* Hardware frame list */
+ dma_addr_t frame_dma_handle; /* Hardware frame list */
__le32 *frame;
- void **frame_cpu; /* CPU's frame list */
+ void **frame_cpu; /* CPU's frame list */
- int fsbr; /* Full-speed bandwidth reclamation */
- unsigned long fsbrtimeout; /* FSBR delay */
+ int fsbr; /* Full-speed bandwidth reclamation */
+ unsigned long fsbrtimeout; /* FSBR delay */
enum uhci_rh_state rh_state;
unsigned long auto_stop_time; /* When to AUTO_STOP */
@@ -392,24 +415,19 @@
/* Main list of URBs currently controlled by this HC */
struct list_head urb_list;
- /* List of QHs that are done, but waiting to be unlinked (race) */
- struct list_head qh_remove_list;
- unsigned int qh_remove_age; /* Age in frames */
-
/* List of TDs that are done, but waiting to be freed (race) */
struct list_head td_remove_list;
unsigned int td_remove_age; /* Age in frames */
- /* List of asynchronously unlinked URBs */
- struct list_head urb_remove_list;
- unsigned int urb_remove_age; /* Age in frames */
-
/* List of URBs awaiting completion callback */
struct list_head complete_list;
+ struct list_head idle_qh_list; /* Where the idle QHs live */
+
int rh_numports; /* Number of root-hub ports */
wait_queue_head_t waitqh; /* endpoint_disable waiters */
+ int num_waiting; /* Number of waiters */
};
/* Convert between a usb_hcd pointer and the corresponding uhci_hcd */
@@ -430,22 +448,19 @@
*/
struct urb_priv {
struct list_head urb_list;
+ struct list_head node; /* Node in the QH's urbp list */
struct urb *urb;
struct uhci_qh *qh; /* QH for this URB */
struct list_head td_list;
- unsigned fsbr : 1; /* URB turned on FSBR */
- unsigned fsbr_timeout : 1; /* URB timed out on FSBR */
- unsigned queued : 1; /* QH was queued (not linked in) */
- unsigned short_control_packet : 1; /* If we get a short packet during */
- /* a control transfer, retrigger */
- /* the status phase */
-
unsigned long fsbrtime; /* In jiffies */
- struct list_head queue_list;
+ unsigned fsbr : 1; /* URB turned on FSBR */
+ unsigned fsbr_timeout : 1; /* URB timed out on FSBR */
+ unsigned short_transfer : 1; /* URB got a short transfer, no
+ * need to rescan */
};
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index 7823980..b1b551a 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -13,13 +13,9 @@
* (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
* support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
* (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
- * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
+ * (C) Copyright 2004-2005 Alan Stern, stern@rowland.harvard.edu
*/
-static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb);
-static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb);
-static void uhci_remove_pending_urbps(struct uhci_hcd *uhci);
-static void uhci_free_pending_qhs(struct uhci_hcd *uhci);
static void uhci_free_pending_tds(struct uhci_hcd *uhci);
/*
@@ -30,7 +26,7 @@
* games with the FSBR code to make sure we get the correct order in all
* the cases. I don't think it's worth the effort
*/
-static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
+static void uhci_set_next_interrupt(struct uhci_hcd *uhci)
{
if (uhci->is_stopped)
mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
@@ -42,12 +38,6 @@
uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC);
}
-static inline void uhci_moveto_complete(struct uhci_hcd *uhci,
- struct urb_priv *urbp)
-{
- list_move_tail(&urbp->urb_list, &uhci->complete_list);
-}
-
static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci)
{
dma_addr_t dma_handle;
@@ -71,6 +61,18 @@
return td;
}
+static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
+{
+ if (!list_empty(&td->list))
+ dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
+ if (!list_empty(&td->remove_list))
+ dev_warn(uhci_dev(uhci), "td %p still in remove_list!\n", td);
+ if (!list_empty(&td->fl_list))
+ dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
+
+ dma_pool_free(uhci->td_pool, td, td->dma_handle);
+}
+
static inline void uhci_fill_td(struct uhci_td *td, u32 status,
u32 token, u32 buffer)
{
@@ -82,7 +84,8 @@
/*
* We insert Isochronous URBs directly into the frame list at the beginning
*/
-static void uhci_insert_td_frame_list(struct uhci_hcd *uhci, struct uhci_td *td, unsigned framenum)
+static inline void uhci_insert_td_in_frame_list(struct uhci_hcd *uhci,
+ struct uhci_td *td, unsigned framenum)
{
framenum &= (UHCI_NUMFRAMES - 1);
@@ -108,7 +111,7 @@
}
}
-static inline void uhci_remove_td_frame_list(struct uhci_hcd *uhci,
+static inline void uhci_remove_td_from_frame_list(struct uhci_hcd *uhci,
struct uhci_td *td)
{
/* If it's not inserted, don't remove it */
@@ -139,48 +142,68 @@
td->frame = -1;
}
-static void unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb)
+/*
+ * Remove all the TDs for an Isochronous URB from the frame list
+ */
+static void uhci_unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb)
{
struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
struct uhci_td *td;
list_for_each_entry(td, &urbp->td_list, list)
- uhci_remove_td_frame_list(uhci, td);
+ uhci_remove_td_from_frame_list(uhci, td);
wmb();
}
/*
- * Inserts a td list into qh.
+ * Remove an URB's TDs from the hardware schedule
*/
-static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct urb *urb, __le32 breadth)
+static void uhci_remove_tds_from_schedule(struct uhci_hcd *uhci,
+ struct urb *urb, int status)
{
- struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
- struct uhci_td *td;
- __le32 *plink;
+ struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
- /* Ordering isn't important here yet since the QH hasn't been */
- /* inserted into the schedule yet */
- plink = &qh->element;
- list_for_each_entry(td, &urbp->td_list, list) {
- *plink = cpu_to_le32(td->dma_handle) | breadth;
- plink = &td->link;
+ /* Isochronous TDs get unlinked directly from the frame list */
+ if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
+ uhci_unlink_isochronous_tds(uhci, urb);
+ return;
}
- *plink = UHCI_PTR_TERM;
+
+ /* If the URB isn't first on its queue, adjust the link pointer
+ * of the last TD in the previous URB. */
+ if (urbp->node.prev != &urbp->qh->queue) {
+ struct urb_priv *purbp;
+ struct uhci_td *ptd, *ltd;
+
+ if (status == -EINPROGRESS)
+ status = 0;
+ purbp = list_entry(urbp->node.prev, struct urb_priv, node);
+ ptd = list_entry(purbp->td_list.prev, struct uhci_td,
+ list);
+ ltd = list_entry(urbp->td_list.prev, struct uhci_td,
+ list);
+ ptd->link = ltd->link;
+ }
+
+ /* If the URB completed with an error, then the QH element certainly
+ * points to one of the URB's TDs. If it completed normally then
+ * the QH element has certainly moved on to the next URB. And if
+ * the URB is still in progress then it must have been dequeued.
+ * The QH element either hasn't reached it yet or is somewhere in
+ * the middle. If the URB wasn't first we can assume that it
+ * hasn't started yet (see above): Otherwise all the preceding URBs
+ * would have completed and been removed from the queue, so this one
+ * _would_ be first.
+ *
+ * If the QH element is inside this URB, clear it. It will be
+ * set properly when the QH is activated.
+ */
+ if (status < 0)
+ urbp->qh->element = UHCI_PTR_TERM;
}
-static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
-{
- if (!list_empty(&td->list))
- dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
- if (!list_empty(&td->remove_list))
- dev_warn(uhci_dev(uhci), "td %p still in remove_list!\n", td);
- if (!list_empty(&td->fl_list))
- dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
-
- dma_pool_free(uhci->td_pool, td, td->dma_handle);
-}
-
-static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci)
+static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci,
+ struct usb_device *udev, struct usb_host_endpoint *hep)
{
dma_addr_t dma_handle;
struct uhci_qh *qh;
@@ -194,256 +217,120 @@
qh->element = UHCI_PTR_TERM;
qh->link = UHCI_PTR_TERM;
- qh->urbp = NULL;
+ INIT_LIST_HEAD(&qh->queue);
+ INIT_LIST_HEAD(&qh->node);
- INIT_LIST_HEAD(&qh->list);
- INIT_LIST_HEAD(&qh->remove_list);
+ if (udev) { /* Normal QH */
+ qh->state = QH_STATE_IDLE;
+ qh->hep = hep;
+ qh->udev = udev;
+ hep->hcpriv = qh;
+ usb_get_dev(udev);
+ } else { /* Skeleton QH */
+ qh->state = QH_STATE_ACTIVE;
+ qh->udev = NULL;
+ }
return qh;
}
static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
- if (!list_empty(&qh->list))
+ WARN_ON(qh->state != QH_STATE_IDLE && qh->udev);
+ if (!list_empty(&qh->queue))
dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh);
- if (!list_empty(&qh->remove_list))
- dev_warn(uhci_dev(uhci), "qh %p still in remove_list!\n", qh);
+ list_del(&qh->node);
+ if (qh->udev) {
+ qh->hep->hcpriv = NULL;
+ usb_put_dev(qh->udev);
+ }
dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
}
/*
- * Append this urb's qh after the last qh in skelqh->list
- *
- * Note that urb_priv.queue_list doesn't have a separate queue head;
- * it's a ring with every element "live".
+ * Put a QH on the schedule in both hardware and software
*/
-static void uhci_insert_qh(struct uhci_hcd *uhci, struct uhci_qh *skelqh, struct urb *urb)
+static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
- struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
- struct urb_priv *turbp;
- struct uhci_qh *lqh;
+ struct uhci_qh *pqh;
- /* Grab the last QH */
- lqh = list_entry(skelqh->list.prev, struct uhci_qh, list);
+ WARN_ON(list_empty(&qh->queue));
- /* Point to the next skelqh */
- urbp->qh->link = lqh->link;
- wmb(); /* Ordering is important */
+ /* Set the element pointer if it isn't set already.
+ * This isn't needed for Isochronous queues, but it doesn't hurt. */
+ if (qh_element(qh) == UHCI_PTR_TERM) {
+ struct urb_priv *urbp = list_entry(qh->queue.next,
+ struct urb_priv, node);
+ struct uhci_td *td = list_entry(urbp->td_list.next,
+ struct uhci_td, list);
- /*
- * Patch QHs for previous endpoint's queued URBs? HC goes
- * here next, not to the next skelqh it now points to.
- *
- * lqh --> td ... --> qh ... --> td --> qh ... --> td
- * | | |
- * v v v
- * +<----------------+-----------------+
- * v
- * newqh --> td ... --> td
- * |
- * v
- * ...
- *
- * The HC could see (and use!) any of these as we write them.
- */
- lqh->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
- if (lqh->urbp) {
- list_for_each_entry(turbp, &lqh->urbp->queue_list, queue_list)
- turbp->qh->link = lqh->link;
+ qh->element = cpu_to_le32(td->dma_handle);
}
- list_add_tail(&urbp->qh->list, &skelqh->list);
+ if (qh->state == QH_STATE_ACTIVE)
+ return;
+ qh->state = QH_STATE_ACTIVE;
+
+ /* Move the QH from its old list to the end of the appropriate
+ * skeleton's list */
+ list_move_tail(&qh->node, &qh->skel->node);
+
+ /* Link it into the schedule */
+ pqh = list_entry(qh->node.prev, struct uhci_qh, node);
+ qh->link = pqh->link;
+ wmb();
+ pqh->link = UHCI_PTR_QH | cpu_to_le32(qh->dma_handle);
}
/*
- * Start removal of QH from schedule; it finishes next frame.
- * TDs should be unlinked before this is called.
+ * Take a QH off the hardware schedule
*/
-static void uhci_remove_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
+static void uhci_unlink_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
struct uhci_qh *pqh;
- __le32 newlink;
- if (!qh)
+ if (qh->state == QH_STATE_UNLINKING)
return;
+ WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev);
+ qh->state = QH_STATE_UNLINKING;
- /*
- * Only go through the hoops if it's actually linked in
- */
- if (!list_empty(&qh->list)) {
-
- /* If our queue is nonempty, make the next URB the head */
- if (!list_empty(&qh->urbp->queue_list)) {
- struct urb_priv *nurbp;
-
- nurbp = list_entry(qh->urbp->queue_list.next,
- struct urb_priv, queue_list);
- nurbp->queued = 0;
- list_add(&nurbp->qh->list, &qh->list);
- newlink = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
- } else
- newlink = qh->link;
-
- /* Fix up the previous QH's queue to link to either
- * the new head of this queue or the start of the
- * next endpoint's queue. */
- pqh = list_entry(qh->list.prev, struct uhci_qh, list);
- pqh->link = newlink;
- if (pqh->urbp) {
- struct urb_priv *turbp;
-
- list_for_each_entry(turbp, &pqh->urbp->queue_list,
- queue_list)
- turbp->qh->link = newlink;
- }
- wmb();
-
- /* Leave qh->link in case the HC is on the QH now, it will */
- /* continue the rest of the schedule */
- qh->element = UHCI_PTR_TERM;
-
- list_del_init(&qh->list);
- }
-
- list_del_init(&qh->urbp->queue_list);
- qh->urbp = NULL;
+ /* Unlink the QH from the schedule and record when we did it */
+ pqh = list_entry(qh->node.prev, struct uhci_qh, node);
+ pqh->link = qh->link;
+ mb();
uhci_get_current_frame_number(uhci);
- if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age) {
- uhci_free_pending_qhs(uhci);
- uhci->qh_remove_age = uhci->frame_number;
- }
+ qh->unlink_frame = uhci->frame_number;
- /* Check to see if the remove list is empty. Set the IOC bit */
- /* to force an interrupt so we can remove the QH */
- if (list_empty(&uhci->qh_remove_list))
+ /* Force an interrupt so we know when the QH is fully unlinked */
+ if (list_empty(&uhci->skel_unlink_qh->node))
uhci_set_next_interrupt(uhci);
- list_add(&qh->remove_list, &uhci->qh_remove_list);
+ /* Move the QH from its old list to the end of the unlinking list */
+ list_move_tail(&qh->node, &uhci->skel_unlink_qh->node);
}
-static int uhci_fixup_toggle(struct urb *urb, unsigned int toggle)
+/*
+ * When we and the controller are through with a QH, it becomes IDLE.
+ * This happens when a QH has been off the schedule (on the unlinking
+ * list) for more than one frame, or when an error occurs while adding
+ * the first URB onto a new QH.
+ */
+static void uhci_make_qh_idle(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
- struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
- struct uhci_td *td;
+ WARN_ON(qh->state == QH_STATE_ACTIVE);
- list_for_each_entry(td, &urbp->td_list, list) {
- if (toggle)
- td->token |= cpu_to_le32(TD_TOKEN_TOGGLE);
- else
- td->token &= ~cpu_to_le32(TD_TOKEN_TOGGLE);
+ list_move(&qh->node, &uhci->idle_qh_list);
+ qh->state = QH_STATE_IDLE;
- toggle ^= 1;
- }
-
- return toggle;
+ /* If anyone is waiting for a QH to become idle, wake them up */
+ if (uhci->num_waiting)
+ wake_up_all(&uhci->waitqh);
}
-/* This function will append one URB's QH to another URB's QH. This is for */
-/* queuing interrupt, control or bulk transfers */
-static void uhci_append_queued_urb(struct uhci_hcd *uhci, struct urb *eurb, struct urb *urb)
-{
- struct urb_priv *eurbp, *urbp, *furbp, *lurbp;
- struct uhci_td *lltd;
-
- eurbp = eurb->hcpriv;
- urbp = urb->hcpriv;
-
- /* Find the first URB in the queue */
- furbp = eurbp;
- if (eurbp->queued) {
- list_for_each_entry(furbp, &eurbp->queue_list, queue_list)
- if (!furbp->queued)
- break;
- }
-
- lurbp = list_entry(furbp->queue_list.prev, struct urb_priv, queue_list);
-
- lltd = list_entry(lurbp->td_list.prev, struct uhci_td, list);
-
- /* Control transfers always start with toggle 0 */
- if (!usb_pipecontrol(urb->pipe))
- usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
- usb_pipeout(urb->pipe),
- uhci_fixup_toggle(urb,
- uhci_toggle(td_token(lltd)) ^ 1));
-
- /* All qhs in the queue need to link to the next queue */
- urbp->qh->link = eurbp->qh->link;
-
- wmb(); /* Make sure we flush everything */
-
- lltd->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
-
- list_add_tail(&urbp->queue_list, &furbp->queue_list);
-
- urbp->queued = 1;
-}
-
-static void uhci_delete_queued_urb(struct uhci_hcd *uhci, struct urb *urb)
-{
- struct urb_priv *urbp, *nurbp, *purbp, *turbp;
- struct uhci_td *pltd;
- unsigned int toggle;
-
- urbp = urb->hcpriv;
-
- if (list_empty(&urbp->queue_list))
- return;
-
- nurbp = list_entry(urbp->queue_list.next, struct urb_priv, queue_list);
-
- /*
- * Fix up the toggle for the following URBs in the queue.
- * Only needed for bulk and interrupt: control and isochronous
- * endpoints don't propagate toggles between messages.
- */
- if (usb_pipebulk(urb->pipe) || usb_pipeint(urb->pipe)) {
- if (!urbp->queued)
- /* We just set the toggle in uhci_unlink_generic */
- toggle = usb_gettoggle(urb->dev,
- usb_pipeendpoint(urb->pipe),
- usb_pipeout(urb->pipe));
- else {
- /* If we're in the middle of the queue, grab the */
- /* toggle from the TD previous to us */
- purbp = list_entry(urbp->queue_list.prev,
- struct urb_priv, queue_list);
- pltd = list_entry(purbp->td_list.prev,
- struct uhci_td, list);
- toggle = uhci_toggle(td_token(pltd)) ^ 1;
- }
-
- list_for_each_entry(turbp, &urbp->queue_list, queue_list) {
- if (!turbp->queued)
- break;
- toggle = uhci_fixup_toggle(turbp->urb, toggle);
- }
-
- usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
- usb_pipeout(urb->pipe), toggle);
- }
-
- if (urbp->queued) {
- /* We're somewhere in the middle (or end). The case where
- * we're at the head is handled in uhci_remove_qh(). */
- purbp = list_entry(urbp->queue_list.prev, struct urb_priv,
- queue_list);
-
- pltd = list_entry(purbp->td_list.prev, struct uhci_td, list);
- if (nurbp->queued)
- pltd->link = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
- else
- /* The next URB happens to be the beginning, so */
- /* we're the last, end the chain */
- pltd->link = UHCI_PTR_TERM;
- }
-
- /* urbp->queue_list is handled in uhci_remove_qh() */
-}
-
-static struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
+static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci,
+ struct urb *urb)
{
struct urb_priv *urbp;
@@ -453,16 +340,13 @@
memset((void *)urbp, 0, sizeof(*urbp));
- urbp->fsbrtime = jiffies;
urbp->urb = urb;
-
- INIT_LIST_HEAD(&urbp->td_list);
- INIT_LIST_HEAD(&urbp->queue_list);
- INIT_LIST_HEAD(&urbp->urb_list);
-
- list_add_tail(&urbp->urb_list, &uhci->urb_list);
-
urb->hcpriv = urbp;
+ urbp->fsbrtime = jiffies;
+
+ INIT_LIST_HEAD(&urbp->node);
+ INIT_LIST_HEAD(&urbp->td_list);
+ INIT_LIST_HEAD(&urbp->urb_list);
return urbp;
}
@@ -482,18 +366,17 @@
list_del_init(&td->list);
}
-static void uhci_destroy_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
+static void uhci_free_urb_priv(struct uhci_hcd *uhci,
+ struct urb_priv *urbp)
{
struct uhci_td *td, *tmp;
- struct urb_priv *urbp;
-
- urbp = (struct urb_priv *)urb->hcpriv;
- if (!urbp)
- return;
if (!list_empty(&urbp->urb_list))
- dev_warn(uhci_dev(uhci), "urb %p still on uhci->urb_list "
- "or uhci->remove_list!\n", urb);
+ dev_warn(uhci_dev(uhci), "urb %p still on uhci->urb_list!\n",
+ urbp->urb);
+ if (!list_empty(&urbp->node))
+ dev_warn(uhci_dev(uhci), "urb %p still on QH's list!\n",
+ urbp->urb);
uhci_get_current_frame_number(uhci);
if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age) {
@@ -502,7 +385,7 @@
}
/* Check to see if the remove list is empty. Set the IOC bit */
- /* to force an interrupt so we can remove the TDs*/
+ /* to force an interrupt so we can remove the TDs. */
if (list_empty(&uhci->td_remove_list))
uhci_set_next_interrupt(uhci);
@@ -511,7 +394,7 @@
list_add(&td->remove_list, &uhci->td_remove_list);
}
- urb->hcpriv = NULL;
+ urbp->urb->hcpriv = NULL;
kmem_cache_free(uhci_up_cachep, urbp);
}
@@ -568,17 +451,82 @@
}
/*
+ * Fix up the data toggles for URBs in a queue, when one of them
+ * terminates early (short transfer, error, or dequeued).
+ */
+static void uhci_fixup_toggles(struct urb *urb)
+{
+ struct list_head *head;
+ struct uhci_td *td;
+ struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
+ int prevactive = 0;
+ unsigned int toggle = 0;
+ struct urb_priv *turbp, *list_end;
+
+ /*
+ * We need to find out what the last successful toggle was so
+ * we can update the data toggles for the following transfers.
+ *
+ * There are 2 ways the last successful completed TD is found:
+ *
+ * 1) The TD is NOT active and the actual length < expected length
+ * 2) The TD is NOT active and it's the last TD in the chain
+ *
+ * and a third way the first uncompleted TD is found:
+ *
+ * 3) The TD is active and the previous TD is NOT active
+ */
+ head = &urbp->td_list;
+ list_for_each_entry(td, head, list) {
+ unsigned int ctrlstat = td_status(td);
+
+ if (!(ctrlstat & TD_CTRL_ACTIVE) &&
+ (uhci_actual_length(ctrlstat) <
+ uhci_expected_length(td_token(td)) ||
+ td->list.next == head))
+ toggle = uhci_toggle(td_token(td)) ^ 1;
+ else if ((ctrlstat & TD_CTRL_ACTIVE) && !prevactive)
+ toggle = uhci_toggle(td_token(td));
+
+ prevactive = ctrlstat & TD_CTRL_ACTIVE;
+ }
+
+ /*
+ * Fix up the toggle for the following URBs in the queue.
+ *
+ * We can stop as soon as we find an URB with toggles set correctly,
+ * because then all the following URBs will be correct also.
+ */
+ list_end = list_entry(&urbp->qh->queue, struct urb_priv, node);
+ turbp = urbp;
+ while ((turbp = list_entry(turbp->node.next, struct urb_priv, node))
+ != list_end) {
+ td = list_entry(turbp->td_list.next, struct uhci_td, list);
+ if (uhci_toggle(td_token(td)) == toggle)
+ return;
+
+ list_for_each_entry(td, &turbp->td_list, list) {
+ td->token ^= __constant_cpu_to_le32(TD_TOKEN_TOGGLE);
+ toggle ^= 1;
+ }
+ }
+
+ usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe), toggle);
+}
+
+/*
* Control transfers
*/
-static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
+ struct uhci_qh *qh)
{
- struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
struct uhci_td *td;
- struct uhci_qh *qh, *skelqh;
unsigned long destination, status;
- int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+ int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
int len = urb->transfer_buffer_length;
dma_addr_t data = urb->transfer_dma;
+ __le32 *plink;
/* The "pipe" thing contains the destination in bits 8--18 */
destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
@@ -597,7 +545,8 @@
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status, destination | uhci_explen(8),
- urb->setup_dma);
+ urb->setup_dma);
+ plink = &td->link;
/*
* If direction is "send", change the packet ID from SETUP (0x2D)
@@ -615,21 +564,20 @@
* Build the DATA TDs
*/
while (len > 0) {
- int pktsze = len;
-
- if (pktsze > maxsze)
- pktsze = maxsze;
+ int pktsze = min(len, maxsze);
td = uhci_alloc_td(uhci);
if (!td)
return -ENOMEM;
+ *plink = cpu_to_le32(td->dma_handle);
/* Alternate Data0/1 (start with Data1) */
destination ^= TD_TOKEN_TOGGLE;
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status, destination | uhci_explen(pktsze),
- data);
+ data);
+ plink = &td->link;
data += pktsze;
len -= pktsze;
@@ -641,6 +589,7 @@
td = uhci_alloc_td(uhci);
if (!td)
return -ENOMEM;
+ *plink = cpu_to_le32(td->dma_handle);
/*
* It's IN if the pipe is an output pipe or we're not expecting
@@ -658,16 +607,7 @@
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status | TD_CTRL_IOC,
- destination | uhci_explen(0), 0);
-
- qh = uhci_alloc_qh(uhci);
- if (!qh)
- return -ENOMEM;
-
- urbp->qh = qh;
- qh->urbp = urbp;
-
- uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);
+ destination | uhci_explen(0), 0);
/* Low-speed transfers get a different queue, and won't hog the bus.
* Also, some devices enumerate better without FSBR; the easiest way
@@ -675,18 +615,13 @@
* isn't in the CONFIGURED state. */
if (urb->dev->speed == USB_SPEED_LOW ||
urb->dev->state != USB_STATE_CONFIGURED)
- skelqh = uhci->skel_ls_control_qh;
+ qh->skel = uhci->skel_ls_control_qh;
else {
- skelqh = uhci->skel_fs_control_qh;
+ qh->skel = uhci->skel_fs_control_qh;
uhci_inc_fsbr(uhci, urb);
}
- if (eurb)
- uhci_append_queued_urb(uhci, eurb, urb);
- else
- uhci_insert_qh(uhci, skelqh, urb);
-
- return -EINPROGRESS;
+ return 0;
}
/*
@@ -703,7 +638,7 @@
struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
struct uhci_td *td;
- urbp->short_control_packet = 1;
+ urbp->short_transfer = 1;
td = list_entry(urbp->td_list.prev, struct uhci_td, list);
urbp->qh->element = cpu_to_le32(td->dma_handle);
@@ -720,16 +655,14 @@
unsigned int status;
int ret = 0;
- if (list_empty(&urbp->td_list))
- return -EINVAL;
-
head = &urbp->td_list;
-
- if (urbp->short_control_packet) {
+ if (urbp->short_transfer) {
tmp = head->prev;
goto status_stage;
}
+ urb->actual_length = 0;
+
tmp = head->next;
td = list_entry(tmp, struct uhci_td, list);
@@ -742,8 +675,6 @@
if (status)
goto td_error;
- urb->actual_length = 0;
-
/* The rest of the TDs (but the last) are data */
tmp = tmp->next;
while (tmp != head && tmp->next != head) {
@@ -770,10 +701,7 @@
goto err;
}
- if (uhci_packetid(td_token(td)) == USB_PID_IN)
- return usb_control_retrigger_status(uhci, urb);
- else
- return 0;
+ return usb_control_retrigger_status(uhci, urb);
}
}
@@ -825,15 +753,15 @@
/*
* Common submit for bulk and interrupt
*/
-static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb, struct uhci_qh *skelqh)
+static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
+ struct uhci_qh *qh)
{
struct uhci_td *td;
- struct uhci_qh *qh;
unsigned long destination, status;
- int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+ int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
int len = urb->transfer_buffer_length;
- struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
dma_addr_t data = urb->transfer_dma;
+ __le32 *plink, fake_link;
if (len < 0)
return -EINVAL;
@@ -841,7 +769,8 @@
/* The "pipe" thing contains the destination in bits 8--18 */
destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
- status = uhci_maxerr(3) | TD_CTRL_ACTIVE;
+ /* 3 errors */
+ status = TD_CTRL_ACTIVE | uhci_maxerr(3);
if (urb->dev->speed == USB_SPEED_LOW)
status |= TD_CTRL_LS;
if (usb_pipein(urb->pipe))
@@ -850,10 +779,11 @@
/*
* Build the DATA TDs
*/
+ plink = &fake_link;
do { /* Allow zero length packets */
int pktsze = maxsze;
- if (pktsze >= len) {
+ if (len <= pktsze) { /* The last packet */
pktsze = len;
if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
status &= ~TD_CTRL_SPD;
@@ -862,12 +792,15 @@
td = uhci_alloc_td(uhci);
if (!td)
return -ENOMEM;
+ *plink = cpu_to_le32(td->dma_handle);
uhci_add_td_to_urb(urb, td);
- uhci_fill_td(td, status, destination | uhci_explen(pktsze) |
+ uhci_fill_td(td, status,
+ destination | uhci_explen(pktsze) |
(usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
data);
+ plink = &td->link;
data += pktsze;
len -= maxsze;
@@ -883,11 +816,13 @@
* however, if transfer_length == 0, the zero packet was already
* prepared above.
*/
- if (usb_pipeout(urb->pipe) && (urb->transfer_flags & URB_ZERO_PACKET) &&
- !len && urb->transfer_buffer_length) {
+ if ((urb->transfer_flags & URB_ZERO_PACKET) &&
+ usb_pipeout(urb->pipe) && len == 0 &&
+ urb->transfer_buffer_length > 0) {
td = uhci_alloc_td(uhci);
if (!td)
return -ENOMEM;
+ *plink = cpu_to_le32(td->dma_handle);
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status, destination | uhci_explen(0) |
@@ -905,24 +840,9 @@
* fast side but not enough to justify delaying an interrupt
* more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT
* flag setting. */
- td->status |= cpu_to_le32(TD_CTRL_IOC);
+ td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
- qh = uhci_alloc_qh(uhci);
- if (!qh)
- return -ENOMEM;
-
- urbp->qh = qh;
- qh->urbp = urbp;
-
- /* Always breadth first */
- uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);
-
- if (eurb)
- uhci_append_queued_urb(uhci, eurb, urb);
- else
- uhci_insert_qh(uhci, skelqh, urb);
-
- return -EINPROGRESS;
+ return 0;
}
/*
@@ -954,8 +874,24 @@
if (urb->transfer_flags & URB_SHORT_NOT_OK) {
ret = -EREMOTEIO;
goto err;
- } else
- return 0;
+ }
+
+ /*
+ * This URB stopped short of its end. We have to
+ * fix up the toggles of the following URBs on the
+ * queue and restart the queue.
+ *
+ * Do this only the first time we encounter the
+ * short URB.
+ */
+ if (!urbp->short_transfer) {
+ urbp->short_transfer = 1;
+ uhci_fixup_toggles(urb);
+ td = list_entry(urbp->td_list.prev,
+ struct uhci_td, list);
+ urbp->qh->element = td->link;
+ }
+ break;
}
}
@@ -988,7 +924,8 @@
return ret;
}
-static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb,
+ struct uhci_qh *qh)
{
int ret;
@@ -996,21 +933,22 @@
if (urb->dev->speed == USB_SPEED_LOW)
return -EINVAL;
- ret = uhci_submit_common(uhci, urb, eurb, uhci->skel_bulk_qh);
- if (ret == -EINPROGRESS)
+ qh->skel = uhci->skel_bulk_qh;
+ ret = uhci_submit_common(uhci, urb, qh);
+ if (ret == 0)
uhci_inc_fsbr(uhci, urb);
-
return ret;
}
-static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb,
+ struct uhci_qh *qh)
{
- /* USB 1.1 interrupt transfers only involve one packet per interval;
- * that's the uhci_submit_common() "breadth first" policy. Drivers
- * can submit urbs of any length, but longer ones might need many
- * intervals to complete.
+ /* USB 1.1 interrupt transfers only involve one packet per interval.
+ * Drivers can submit URBs of any length, but longer ones will need
+ * multiple intervals to complete.
*/
- return uhci_submit_common(uhci, urb, eurb, uhci->skelqh[__interval_to_skel(urb->interval)]);
+ qh->skel = uhci->skelqh[__interval_to_skel(urb->interval)];
+ return uhci_submit_common(uhci, urb, qh);
}
/*
@@ -1072,11 +1010,12 @@
/*
* Isochronous transfers
*/
-static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb)
+static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb,
+ struct uhci_qh *qh)
{
- struct uhci_td *td;
+ struct uhci_td *td = NULL; /* Since urb->number_of_packets > 0 */
int i, ret, frame;
- int status, destination;
+ unsigned long destination, status;
struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
@@ -1092,20 +1031,25 @@
return -ENOMEM;
uhci_add_td_to_urb(urb, td);
- uhci_fill_td(td, status, destination | uhci_explen(urb->iso_frame_desc[i].length),
- urb->transfer_dma + urb->iso_frame_desc[i].offset);
-
- if (i + 1 >= urb->number_of_packets)
- td->status |= cpu_to_le32(TD_CTRL_IOC);
+ uhci_fill_td(td, status, destination |
+ uhci_explen(urb->iso_frame_desc[i].length),
+ urb->transfer_dma +
+ urb->iso_frame_desc[i].offset);
}
+ /* Set the interrupt-on-completion flag on the last packet. */
+ td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
+
+ qh->skel = uhci->skel_iso_qh;
+
+ /* Add the TDs to the frame list */
frame = urb->start_frame;
list_for_each_entry(td, &urbp->td_list, list) {
- uhci_insert_td_frame_list(uhci, td, frame);
+ uhci_insert_td_in_frame_list(uhci, td, frame);
frame += urb->interval;
}
- return -EINPROGRESS;
+ return 0;
}
static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
@@ -1139,80 +1083,67 @@
i++;
}
- unlink_isochronous_tds(uhci, urb);
return ret;
}
-static struct urb *uhci_find_urb_ep(struct uhci_hcd *uhci, struct urb *urb)
-{
- struct urb_priv *up;
-
- /* We don't match Isoc transfers since they are special */
- if (usb_pipeisoc(urb->pipe))
- return NULL;
-
- list_for_each_entry(up, &uhci->urb_list, urb_list) {
- struct urb *u = up->urb;
-
- if (u->dev == urb->dev && u->status == -EINPROGRESS) {
- /* For control, ignore the direction */
- if (usb_pipecontrol(urb->pipe) &&
- (u->pipe & ~USB_DIR_IN) == (urb->pipe & ~USB_DIR_IN))
- return u;
- else if (u->pipe == urb->pipe)
- return u;
- }
- }
-
- return NULL;
-}
-
static int uhci_urb_enqueue(struct usb_hcd *hcd,
- struct usb_host_endpoint *ep,
+ struct usb_host_endpoint *hep,
struct urb *urb, gfp_t mem_flags)
{
int ret;
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
unsigned long flags;
- struct urb *eurb;
+ struct urb_priv *urbp;
+ struct uhci_qh *qh;
int bustime;
spin_lock_irqsave(&uhci->lock, flags);
ret = urb->status;
if (ret != -EINPROGRESS) /* URB already unlinked! */
- goto out;
+ goto done;
- eurb = uhci_find_urb_ep(uhci, urb);
+ ret = -ENOMEM;
+ urbp = uhci_alloc_urb_priv(uhci, urb);
+ if (!urbp)
+ goto done;
- if (!uhci_alloc_urb_priv(uhci, urb)) {
- ret = -ENOMEM;
- goto out;
+ if (hep->hcpriv)
+ qh = (struct uhci_qh *) hep->hcpriv;
+ else {
+ qh = uhci_alloc_qh(uhci, urb->dev, hep);
+ if (!qh)
+ goto err_no_qh;
}
+ urbp->qh = qh;
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
- ret = uhci_submit_control(uhci, urb, eurb);
+ ret = uhci_submit_control(uhci, urb, qh);
+ break;
+ case PIPE_BULK:
+ ret = uhci_submit_bulk(uhci, urb, qh);
break;
case PIPE_INTERRUPT:
- if (!eurb) {
+ if (list_empty(&qh->queue)) {
bustime = usb_check_bandwidth(urb->dev, urb);
if (bustime < 0)
ret = bustime;
else {
- ret = uhci_submit_interrupt(uhci, urb, eurb);
- if (ret == -EINPROGRESS)
+ ret = uhci_submit_interrupt(uhci, urb, qh);
+ if (ret == 0)
usb_claim_bandwidth(urb->dev, urb, bustime, 0);
}
} else { /* inherit from parent */
- urb->bandwidth = eurb->bandwidth;
- ret = uhci_submit_interrupt(uhci, urb, eurb);
+ struct urb_priv *eurbp;
+
+ eurbp = list_entry(qh->queue.prev, struct urb_priv,
+ node);
+ urb->bandwidth = eurbp->urb->bandwidth;
+ ret = uhci_submit_interrupt(uhci, urb, qh);
}
break;
- case PIPE_BULK:
- ret = uhci_submit_bulk(uhci, urb, eurb);
- break;
case PIPE_ISOCHRONOUS:
bustime = usb_check_bandwidth(urb->dev, urb);
if (bustime < 0) {
@@ -1220,22 +1151,59 @@
break;
}
- ret = uhci_submit_isochronous(uhci, urb);
- if (ret == -EINPROGRESS)
+ ret = uhci_submit_isochronous(uhci, urb, qh);
+ if (ret == 0)
usb_claim_bandwidth(urb->dev, urb, bustime, 1);
break;
}
+ if (ret != 0)
+ goto err_submit_failed;
- if (ret != -EINPROGRESS) {
- /* Submit failed, so delete it from the urb_list */
- struct urb_priv *urbp = urb->hcpriv;
+ /* Add this URB to the QH */
+ urbp->qh = qh;
+ list_add_tail(&urbp->node, &qh->queue);
+ list_add_tail(&urbp->urb_list, &uhci->urb_list);
- list_del_init(&urbp->urb_list);
- uhci_destroy_urb_priv(uhci, urb);
- } else
- ret = 0;
+ /* If the new URB is the first and only one on this QH then either
+ * the QH is new and idle or else it's unlinked and waiting to
+ * become idle, so we can activate it right away. */
+ if (qh->queue.next == &urbp->node)
+ uhci_activate_qh(uhci, qh);
-out:
+ /* If the QH is already active, we have a race with the hardware.
+ * This won't get fixed until dummy TDs are added. */
+ else if (qh->state == QH_STATE_ACTIVE) {
+
+ /* If the URB isn't first on its queue, adjust the link pointer
+ * of the last TD in the previous URB. */
+ if (urbp->node.prev != &urbp->qh->queue) {
+ struct urb_priv *purbp = list_entry(urbp->node.prev,
+ struct urb_priv, node);
+ struct uhci_td *ptd = list_entry(purbp->td_list.prev,
+ struct uhci_td, list);
+ struct uhci_td *td = list_entry(urbp->td_list.next,
+ struct uhci_td, list);
+
+ ptd->link = cpu_to_le32(td->dma_handle);
+
+ }
+ if (qh_element(qh) == UHCI_PTR_TERM) {
+ struct uhci_td *td = list_entry(urbp->td_list.next,
+ struct uhci_td, list);
+
+ qh->element = cpu_to_le32(td->dma_handle);
+ }
+ }
+ goto done;
+
+err_submit_failed:
+ if (qh->state == QH_STATE_IDLE)
+ uhci_make_qh_idle(uhci, qh); /* Reclaim unused QH */
+
+err_no_qh:
+ uhci_free_urb_priv(uhci, urbp);
+
+done:
spin_unlock_irqrestore(&uhci->lock, flags);
return ret;
}
@@ -1245,119 +1213,115 @@
*/
static void uhci_transfer_result(struct uhci_hcd *uhci, struct urb *urb)
{
- int ret = -EINPROGRESS;
- struct urb_priv *urbp;
-
- spin_lock(&urb->lock);
-
- urbp = (struct urb_priv *)urb->hcpriv;
-
- if (urb->status != -EINPROGRESS) /* URB already dequeued */
- goto out;
+ int status;
+ int okay_to_giveback = 0;
+ struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
- ret = uhci_result_control(uhci, urb);
- break;
- case PIPE_BULK:
- case PIPE_INTERRUPT:
- ret = uhci_result_common(uhci, urb);
+ status = uhci_result_control(uhci, urb);
break;
case PIPE_ISOCHRONOUS:
- ret = uhci_result_isochronous(uhci, urb);
+ status = uhci_result_isochronous(uhci, urb);
+ break;
+ default: /* PIPE_BULK or PIPE_INTERRUPT */
+ status = uhci_result_common(uhci, urb);
break;
}
- if (ret == -EINPROGRESS)
- goto out;
- urb->status = ret;
+ spin_lock(&urb->lock);
+ if (urb->status == -EINPROGRESS) { /* Not yet dequeued */
+ if (status != -EINPROGRESS) { /* URB has completed */
+ urb->status = status;
+
+ /* If the URB got a real error (as opposed to
+ * simply being dequeued), we don't have to
+ * unlink the QH. Fix this later... */
+ if (status < 0)
+ uhci_unlink_qh(uhci, urbp->qh);
+ else
+ okay_to_giveback = 1;
+ }
+ } else { /* Already dequeued */
+ if (urbp->qh->state == QH_STATE_UNLINKING &&
+ uhci->frame_number + uhci->is_stopped !=
+ urbp->qh->unlink_frame)
+ okay_to_giveback = 1;
+ }
+ spin_unlock(&urb->lock);
+ if (!okay_to_giveback)
+ return;
switch (usb_pipetype(urb->pipe)) {
- case PIPE_CONTROL:
- case PIPE_BULK:
case PIPE_ISOCHRONOUS:
/* Release bandwidth for Interrupt or Isoc. transfers */
if (urb->bandwidth)
usb_release_bandwidth(urb->dev, urb, 1);
- uhci_unlink_generic(uhci, urb);
break;
case PIPE_INTERRUPT:
/* Release bandwidth for Interrupt or Isoc. transfers */
/* Make sure we don't release if we have a queued URB */
- if (list_empty(&urbp->queue_list) && urb->bandwidth)
+ if (list_empty(&urbp->qh->queue) && urb->bandwidth)
usb_release_bandwidth(urb->dev, urb, 0);
else
/* bandwidth was passed on to queued URB, */
/* so don't let usb_unlink_urb() release it */
urb->bandwidth = 0;
- uhci_unlink_generic(uhci, urb);
+ /* Falls through */
+ case PIPE_BULK:
+ if (status < 0)
+ uhci_fixup_toggles(urb);
break;
- default:
- dev_info(uhci_dev(uhci), "%s: unknown pipe type %d "
- "for urb %p\n",
- __FUNCTION__, usb_pipetype(urb->pipe), urb);
+ default: /* PIPE_CONTROL */
+ break;
}
- /* Move it from uhci->urb_list to uhci->complete_list */
- uhci_moveto_complete(uhci, urbp);
+ /* Take the URB's TDs off the hardware schedule */
+ uhci_remove_tds_from_schedule(uhci, urb, status);
-out:
- spin_unlock(&urb->lock);
-}
-
-static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb)
-{
- struct list_head *head;
- struct uhci_td *td;
- struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
- int prevactive = 0;
+ /* Take the URB off the QH's queue and see if the QH is now unused */
+ list_del_init(&urbp->node);
+ if (list_empty(&urbp->qh->queue))
+ uhci_unlink_qh(uhci, urbp->qh);
uhci_dec_fsbr(uhci, urb); /* Safe since it checks */
- /*
- * Now we need to find out what the last successful toggle was
- * so we can update the local data toggle for the next transfer
- *
- * There are 2 ways the last successful completed TD is found:
- *
- * 1) The TD is NOT active and the actual length < expected length
- * 2) The TD is NOT active and it's the last TD in the chain
- *
- * and a third way the first uncompleted TD is found:
- *
- * 3) The TD is active and the previous TD is NOT active
- *
- * Control and Isochronous ignore the toggle, so this is safe
- * for all types
- *
- * FIXME: The toggle fixups won't be 100% reliable until we
- * change over to using a single queue for each endpoint and
- * stop the queue before unlinking.
- */
- head = &urbp->td_list;
- list_for_each_entry(td, head, list) {
- unsigned int ctrlstat = td_status(td);
+ /* Queue it for giving back */
+ list_move_tail(&urbp->urb_list, &uhci->complete_list);
+}
- if (!(ctrlstat & TD_CTRL_ACTIVE) &&
- (uhci_actual_length(ctrlstat) <
- uhci_expected_length(td_token(td)) ||
- td->list.next == head))
- usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
- uhci_packetout(td_token(td)),
- uhci_toggle(td_token(td)) ^ 1);
- else if ((ctrlstat & TD_CTRL_ACTIVE) && !prevactive)
- usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
- uhci_packetout(td_token(td)),
- uhci_toggle(td_token(td)));
+/*
+ * Check out the QHs waiting to be fully unlinked
+ */
+static void uhci_scan_unlinking_qhs(struct uhci_hcd *uhci)
+{
+ struct uhci_qh *qh, *tmp;
- prevactive = ctrlstat & TD_CTRL_ACTIVE;
+ list_for_each_entry_safe(qh, tmp, &uhci->skel_unlink_qh->node, node) {
+
+ /* If the queue is empty and the QH is fully unlinked then
+ * it can become IDLE. */
+ if (list_empty(&qh->queue)) {
+ if (uhci->frame_number + uhci->is_stopped !=
+ qh->unlink_frame)
+ uhci_make_qh_idle(uhci, qh);
+
+ /* If none of the QH's URBs have been dequeued then the QH
+ * should be re-activated. */
+ } else {
+ struct urb_priv *urbp;
+ int any_dequeued = 0;
+
+ list_for_each_entry(urbp, &qh->queue, node) {
+ if (urbp->urb->status != -EINPROGRESS) {
+ any_dequeued = 1;
+ break;
+ }
+ }
+ if (!any_dequeued)
+ uhci_activate_qh(uhci, qh);
+ }
}
-
- uhci_delete_queued_urb(uhci, urb);
-
- /* The interrupt loop will reclaim the QHs */
- uhci_remove_qh(uhci, urbp->qh);
- urbp->qh = NULL;
}
static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
@@ -1370,22 +1334,11 @@
urbp = urb->hcpriv;
if (!urbp) /* URB was never linked! */
goto done;
- list_del_init(&urbp->urb_list);
+ /* Remove Isochronous TDs from the frame list ASAP */
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
- unlink_isochronous_tds(uhci, urb);
- uhci_unlink_generic(uhci, urb);
-
- uhci_get_current_frame_number(uhci);
- if (uhci->frame_number + uhci->is_stopped != uhci->urb_remove_age) {
- uhci_remove_pending_urbps(uhci);
- uhci->urb_remove_age = uhci->frame_number;
- }
-
- /* If we're the first, set the next interrupt bit */
- if (list_empty(&uhci->urb_remove_list))
- uhci_set_next_interrupt(uhci);
- list_add_tail(&urbp->urb_list, &uhci->urb_remove_list);
+ uhci_unlink_isochronous_tds(uhci, urb);
+ uhci_unlink_qh(uhci, urbp->qh);
done:
spin_unlock_irqrestore(&uhci->lock, flags);
@@ -1426,17 +1379,6 @@
return 0;
}
-static void uhci_free_pending_qhs(struct uhci_hcd *uhci)
-{
- struct uhci_qh *qh, *tmp;
-
- list_for_each_entry_safe(qh, tmp, &uhci->qh_remove_list, remove_list) {
- list_del_init(&qh->remove_list);
-
- uhci_free_qh(uhci, qh);
- }
-}
-
static void uhci_free_pending_tds(struct uhci_hcd *uhci)
{
struct uhci_td *td, *tmp;
@@ -1455,7 +1397,7 @@
{
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
- uhci_destroy_urb_priv(uhci, urb);
+ uhci_free_urb_priv(uhci, (struct urb_priv *) (urb->hcpriv));
spin_unlock(&uhci->lock);
usb_hcd_giveback_urb(hcd, urb, regs);
@@ -1474,13 +1416,6 @@
}
}
-static void uhci_remove_pending_urbps(struct uhci_hcd *uhci)
-{
-
- /* Splice the urb_remove_list onto the end of the complete_list */
- list_splice_init(&uhci->urb_remove_list, uhci->complete_list.prev);
-}
-
/* Process events in the schedule, but only in one thread at a time */
static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs)
{
@@ -1498,12 +1433,8 @@
uhci_clear_next_interrupt(uhci);
uhci_get_current_frame_number(uhci);
- if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age)
- uhci_free_pending_qhs(uhci);
if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age)
uhci_free_pending_tds(uhci);
- if (uhci->frame_number + uhci->is_stopped != uhci->urb_remove_age)
- uhci_remove_pending_urbps(uhci);
/* Walk the list of pending URBs to see which ones completed
* (must be _safe because uhci_transfer_result() dequeues URBs) */
@@ -1516,25 +1447,21 @@
uhci_finish_completion(uhci, regs);
/* If the controller is stopped, we can finish these off right now */
- if (uhci->is_stopped) {
- uhci_free_pending_qhs(uhci);
+ if (uhci->is_stopped)
uhci_free_pending_tds(uhci);
- uhci_remove_pending_urbps(uhci);
- }
if (uhci->need_rescan)
goto rescan;
uhci->scan_in_progress = 0;
- if (list_empty(&uhci->urb_remove_list) &&
- list_empty(&uhci->td_remove_list) &&
- list_empty(&uhci->qh_remove_list))
+ /* Check out the QHs waiting for unlinking */
+ uhci_scan_unlinking_qhs(uhci);
+
+ if (list_empty(&uhci->td_remove_list) &&
+ list_empty(&uhci->skel_unlink_qh->node))
uhci_clear_next_interrupt(uhci);
else
uhci_set_next_interrupt(uhci);
-
- /* Wake up anyone waiting for an URB to complete */
- wake_up_all(&uhci->waitqh);
}
static void check_fsbr(struct uhci_hcd *uhci)
