diff options
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/ehci-dbg.c | 4 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 77 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-hub.c | 2 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-pci.c | 2 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-q.c | 6 | ||||
| -rw-r--r-- | drivers/usb/host/ehci.h | 22 |
6 files changed, 75 insertions, 38 deletions
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c index 39673f8194d..64ebfc5548a 100644 --- a/drivers/usb/host/ehci-dbg.c +++ b/drivers/usb/host/ehci-dbg.c @@ -786,9 +786,7 @@ static ssize_t fill_registers_buffer(struct debug_buffer *buf) } if (ehci->reclaim) { - temp = scnprintf (next, size, "reclaim qh %p%s\n", - ehci->reclaim, - ehci->reclaim_ready ? " ready" : ""); + temp = scnprintf(next, size, "reclaim qh %p\n", ehci->reclaim); size -= temp; next += temp; } diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 264182654f4..5917c6b7ce3 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -110,7 +110,7 @@ static const char hcd_name [] = "ehci_hcd"; #define EHCI_TUNE_MULT_TT 1 #define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */ -#define EHCI_IAA_JIFFIES (HZ/100) /* arbitrary; ~10 msec */ +#define EHCI_IAA_MSECS 10 /* arbitrary */ #define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */ #define EHCI_ASYNC_JIFFIES (HZ/20) /* async idle timeout */ #define EHCI_SHRINK_JIFFIES (HZ/200) /* async qh unlink delay */ @@ -267,6 +267,7 @@ static void ehci_quiesce (struct ehci_hcd *ehci) /*-------------------------------------------------------------------------*/ +static void end_unlink_async(struct ehci_hcd *ehci); static void ehci_work(struct ehci_hcd *ehci); #include "ehci-hub.c" @@ -276,25 +277,41 @@ static void ehci_work(struct ehci_hcd *ehci); /*-------------------------------------------------------------------------*/ -static void ehci_watchdog (unsigned long param) +static void ehci_iaa_watchdog(unsigned long param) { struct ehci_hcd *ehci = (struct ehci_hcd *) param; unsigned long flags; + u32 status, cmd; spin_lock_irqsave (&ehci->lock, flags); + WARN_ON(!ehci->reclaim); - /* lost IAA irqs wedge things badly; seen with a vt8235 */ + status = ehci_readl(ehci, &ehci->regs->status); + cmd = ehci_readl(ehci, &ehci->regs->command); + ehci_dbg(ehci, "IAA watchdog: status %x cmd %x\n", status, cmd); + + /* lost IAA irqs wedge things badly; seen first with a vt8235 */ if (ehci->reclaim) { - u32 status = ehci_readl(ehci, &ehci->regs->status); if (status & STS_IAA) { ehci_vdbg (ehci, "lost IAA\n"); COUNT (ehci->stats.lost_iaa); ehci_writel(ehci, STS_IAA, &ehci->regs->status); - ehci->reclaim_ready = 1; } + ehci_writel(ehci, cmd & ~CMD_IAAD, &ehci->regs->command); + end_unlink_async(ehci); } - /* stop async processing after it's idled a bit */ + spin_unlock_irqrestore(&ehci->lock, flags); +} + +static void ehci_watchdog(unsigned long param) +{ + struct ehci_hcd *ehci = (struct ehci_hcd *) param; + unsigned long flags; + + spin_lock_irqsave(&ehci->lock, flags); + + /* stop async processing after it's idled a bit */ if (test_bit (TIMER_ASYNC_OFF, &ehci->actions)) start_unlink_async (ehci, ehci->async); @@ -364,8 +381,6 @@ static void ehci_port_power (struct ehci_hcd *ehci, int is_on) static void ehci_work (struct ehci_hcd *ehci) { timer_action_done (ehci, TIMER_IO_WATCHDOG); - if (ehci->reclaim_ready) - end_unlink_async (ehci); /* another CPU may drop ehci->lock during a schedule scan while * it reports urb completions. this flag guards against bogus @@ -400,6 +415,7 @@ static void ehci_stop (struct usb_hcd *hcd) /* no more interrupts ... */ del_timer_sync (&ehci->watchdog); + del_timer_sync(&ehci->iaa_watchdog); spin_lock_irq(&ehci->lock); if (HC_IS_RUNNING (hcd->state)) @@ -448,6 +464,10 @@ static int ehci_init(struct usb_hcd *hcd) ehci->watchdog.function = ehci_watchdog; ehci->watchdog.data = (unsigned long) ehci; + init_timer(&ehci->iaa_watchdog); + ehci->iaa_watchdog.function = ehci_iaa_watchdog; + ehci->iaa_watchdog.data = (unsigned long) ehci; + /* * hw default: 1K periodic list heads, one per frame. * periodic_size can shrink by USBCMD update if hcc_params allows. @@ -464,7 +484,6 @@ static int ehci_init(struct usb_hcd *hcd) ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params); ehci->reclaim = NULL; - ehci->reclaim_ready = 0; ehci->next_uframe = -1; /* @@ -655,8 +674,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) /* complete the unlinking of some qh [4.15.2.3] */ if (status & STS_IAA) { COUNT (ehci->stats.reclaim); - ehci->reclaim_ready = 1; - bh = 1; + end_unlink_async(ehci); } /* remote wakeup [4.3.1] */ @@ -762,10 +780,16 @@ static int ehci_urb_enqueue ( static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) { - /* if we need to use IAA and it's busy, defer */ - if (qh->qh_state == QH_STATE_LINKED - && ehci->reclaim - && HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) { + /* failfast */ + if (!HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) + end_unlink_async(ehci); + + /* if it's not linked then there's nothing to do */ + if (qh->qh_state != QH_STATE_LINKED) + ; + + /* defer till later if busy */ + else if (ehci->reclaim) { struct ehci_qh *last; for (last = ehci->reclaim; @@ -775,12 +799,8 @@ static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) qh->qh_state = QH_STATE_UNLINK_WAIT; last->reclaim = qh; - /* bypass IAA if the hc can't care */ - } else if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state) && ehci->reclaim) - end_unlink_async (ehci); - - /* something else might have unlinked the qh by now */ - if (qh->qh_state == QH_STATE_LINKED) + /* start IAA cycle */ + } else start_unlink_async (ehci, qh); } @@ -807,7 +827,19 @@ static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) qh = (struct ehci_qh *) urb->hcpriv; if (!qh) break; - unlink_async (ehci, qh); + switch (qh->qh_state) { + case QH_STATE_LINKED: + case QH_STATE_COMPLETING: + unlink_async(ehci, qh); + break; + case QH_STATE_UNLINK: + case QH_STATE_UNLINK_WAIT: + /* already started */ + break; + case QH_STATE_IDLE: + WARN_ON(1); + break; + } break; case PIPE_INTERRUPT: @@ -899,6 +931,7 @@ rescan: unlink_async (ehci, qh); /* FALL THROUGH */ case QH_STATE_UNLINK: /* wait for hw to finish? */ + case QH_STATE_UNLINK_WAIT: idle_timeout: spin_unlock_irqrestore (&ehci->lock, flags); schedule_timeout_uninterruptible(1); diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index a165e0a0961..a249d03a502 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -134,7 +134,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd) } ehci->command = ehci_readl(ehci, &ehci->regs->command); if (ehci->reclaim) - ehci->reclaim_ready = 1; + end_unlink_async(ehci); ehci_work(ehci); /* Unlike other USB host controller types, EHCI doesn't have diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index 45e04000028..3ba01664f82 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -305,7 +305,7 @@ static int ehci_pci_resume(struct usb_hcd *hcd) /* emptying the schedule aborts any urbs */ spin_lock_irq(&ehci->lock); if (ehci->reclaim) - ehci->reclaim_ready = 1; + end_unlink_async(ehci); ehci_work(ehci); spin_unlock_irq(&ehci->lock); diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c index b10f39c047e..853e5e6396a 100644 --- a/drivers/usb/host/ehci-q.c +++ b/drivers/usb/host/ehci-q.c @@ -973,7 +973,7 @@ static void end_unlink_async (struct ehci_hcd *ehci) struct ehci_qh *qh = ehci->reclaim; struct ehci_qh *next; - timer_action_done (ehci, TIMER_IAA_WATCHDOG); + iaa_watchdog_done(ehci); // qh->hw_next = cpu_to_hc32(qh->qh_dma); qh->qh_state = QH_STATE_IDLE; @@ -983,7 +983,6 @@ static void end_unlink_async (struct ehci_hcd *ehci) /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */ next = qh->reclaim; ehci->reclaim = next; - ehci->reclaim_ready = 0; qh->reclaim = NULL; qh_completions (ehci, qh); @@ -1059,11 +1058,10 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) return; } - ehci->reclaim_ready = 0; cmd |= CMD_IAAD; ehci_writel(ehci, cmd, &ehci->regs->command); (void)ehci_readl(ehci, &ehci->regs->command); - timer_action (ehci, TIMER_IAA_WATCHDOG); + iaa_watchdog_start(ehci); } /*-------------------------------------------------------------------------*/ diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index 10e71417c35..eeda4c88eba 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -74,7 +74,6 @@ struct ehci_hcd { /* one per controller */ /* async schedule support */ struct ehci_qh *async; struct ehci_qh *reclaim; - unsigned reclaim_ready : 1; unsigned scanning : 1; /* periodic schedule support */ @@ -105,6 +104,7 @@ struct ehci_hcd { /* one per controller */ struct dma_pool *itd_pool; /* itd per iso urb */ struct dma_pool *sitd_pool; /* sitd per split iso urb */ + struct timer_list iaa_watchdog; struct timer_list watchdog; unsigned long actions; unsigned stamp; @@ -148,9 +148,21 @@ static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci) } +static inline void +iaa_watchdog_start(struct ehci_hcd *ehci) +{ + WARN_ON(timer_pending(&ehci->iaa_watchdog)); + mod_timer(&ehci->iaa_watchdog, + jiffies + msecs_to_jiffies(EHCI_IAA_MSECS)); +} + +static inline void iaa_watchdog_done(struct ehci_hcd *ehci) +{ + del_timer(&ehci->iaa_watchdog); +} + enum ehci_timer_action { TIMER_IO_WATCHDOG, - TIMER_IAA_WATCHDOG, TIMER_ASYNC_SHRINK, TIMER_ASYNC_OFF, }; @@ -168,9 +180,6 @@ timer_action (struct ehci_hcd *ehci, enum ehci_timer_action action) unsigned long t; switch (action) { - case TIMER_IAA_WATCHDOG: - t = EHCI_IAA_JIFFIES; - break; case TIMER_IO_WATCHDOG: t = EHCI_IO_JIFFIES; break; @@ -187,8 +196,7 @@ timer_action (struct ehci_hcd *ehci, enum ehci_timer_action action) // async queue SHRINK often precedes IAA. while it's ready // to go OFF neither can matter, and afterwards the IO // watchdog stops unless there's still periodic traffic. - if (action != TIMER_IAA_WATCHDOG - && t > ehci->watchdog.expires + if (time_before_eq(t, ehci->watchdog.expires) && timer_pending (&ehci->watchdog)) return; mod_timer (&ehci->watchdog, t); |