diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2012-05-11 09:18:05 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2012-06-07 10:02:20 +0200 |
| commit | 4aed20e2d70f4353164399a173f20c3ab435b4eb (patch) | |
| tree | 256092ca17acf13f36bfd4ef743a84844c9864b0 /hw/usb | |
| parent | 349417004a0f7cf5518a998dca755cd06f6c212b (diff) | |
uhci: fix bandwidth management
uhci_process_frame() can be invoked multiple times per frame, so
accounting usb bandwith in a local variable doesn't fly, use a variable
in UHCIState instead. Also check the limit more frequently.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'hw/usb')
| -rw-r--r-- | hw/usb/hcd-uhci.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c index 9e211a0bb4..48ad35c78d 100644 --- a/hw/usb/hcd-uhci.c +++ b/hw/usb/hcd-uhci.c @@ -131,6 +131,7 @@ struct UHCIState { uint8_t status2; /* bit 0 and 1 are used to generate UHCI_STS_USBINT */ int64_t expire_time; QEMUTimer *frame_timer; + uint32_t frame_bytes; UHCIPort ports[NB_PORTS]; /* Interrupts that should be raised at the end of the current frame. */ @@ -985,7 +986,7 @@ static void uhci_fill_queue(UHCIState *s, UHCI_TD *td) static void uhci_process_frame(UHCIState *s) { uint32_t frame_addr, link, old_td_ctrl, val, int_mask; - uint32_t curr_qh, td_count = 0, bytes_count = 0; + uint32_t curr_qh, td_count = 0; int cnt, ret; UHCI_TD td; UHCI_QH qh; @@ -1002,6 +1003,12 @@ static void uhci_process_frame(UHCIState *s) qhdb_reset(&qhdb); for (cnt = FRAME_MAX_LOOPS; is_valid(link) && cnt; cnt--) { + if (s->frame_bytes >= 1280) { + /* We've reached the usb 1.1 bandwidth, which is + 1280 bytes/frame, stop processing */ + trace_usb_uhci_frame_stop_bandwidth(); + break; + } if (is_qh(link)) { /* QH */ trace_usb_uhci_qh_load(link & ~0xf); @@ -1011,18 +1018,12 @@ static void uhci_process_frame(UHCIState *s) * We're going in circles. Which is not a bug because * HCD is allowed to do that as part of the BW management. * - * Stop processing here if - * (a) no transaction has been done since we've been - * here last time, or - * (b) we've reached the usb 1.1 bandwidth, which is - * 1280 bytes/frame. + * Stop processing here if no transaction has been done + * since we've been here last time. */ if (td_count == 0) { trace_usb_uhci_frame_loop_stop_idle(); break; - } else if (bytes_count >= 1280) { - trace_usb_uhci_frame_loop_stop_bandwidth(); - break; } else { trace_usb_uhci_frame_loop_continue(); td_count = 0; @@ -1085,7 +1086,7 @@ static void uhci_process_frame(UHCIState *s) trace_usb_uhci_td_complete(curr_qh & ~0xf, link & ~0xf); link = td.link; td_count++; - bytes_count += (td.ctrl & 0x7ff) + 1; + s->frame_bytes += (td.ctrl & 0x7ff) + 1; if (curr_qh) { /* update QH element link */ @@ -1118,6 +1119,7 @@ static void uhci_frame_timer(void *opaque) /* prepare the timer for the next frame */ s->expire_time += (get_ticks_per_sec() / FRAME_TIMER_FREQ); + s->frame_bytes = 0; if (!(s->cmd & UHCI_CMD_RS)) { /* Full stop */ |