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XHCI: Add support for fragmented transfers.

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I was not actually aware that our USB stack already supported
breaking (bulk) transfers up into smaller units as necessary;
these APIs are not very well documented.

This makes #15569 occur far less often, though it is still
more than possible to trigger.
This commit is contained in:
Augustin Cavalier 2021-09-20 12:25:09 -04:00
parent bc7fd43358
commit 3e0eea85ec
1 changed files with 25 additions and 10 deletions
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35
src/add-ons/kernel/busses/usb/xhci.cpp
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@ -788,7 +788,7 @@ XHCI::SubmitControlRequest(Transfer *transfer)
status_t
XHCI::SubmitNormalRequest(Transfer *transfer)
{
TRACE("SubmitNormalRequest() length %ld\n", transfer->DataLength());
TRACE("SubmitNormalRequest() length %ld\n", transfer->FragmentLength());
Pipe *pipe = transfer->TransferPipe();
usb_isochronous_data *isochronousData = transfer->IsochronousData();
@ -826,7 +826,7 @@ XHCI::SubmitNormalRequest(Transfer *transfer)
}
// Now that we know trbSize, compute the count.
const int32 trbCount = (transfer->DataLength() + trbSize - 1) / trbSize;
const int32 trbCount = (transfer->FragmentLength() + trbSize - 1) / trbSize;
xhci_td *td = CreateDescriptor(trbCount, trbCount, trbSize);
if (td == NULL)
@ -834,7 +834,7 @@ XHCI::SubmitNormalRequest(Transfer *transfer)
// Normal Stage
const size_t maxPacketSize = pipe->MaxPacketSize();
size_t remaining = transfer->DataLength();
size_t remaining = transfer->FragmentLength();
for (int32 i = 0; i < trbCount; i++) {
int32 trbLength = (remaining < trbSize) ? remaining : trbSize;
remaining -= trbLength;
@ -2914,7 +2914,8 @@ XHCI::FinishTransfers()
bool directionIn = (transfer->TransferPipe()->Direction() != Pipe::Out);
status_t callbackStatus = B_OK;
switch (td->trb_completion_code) {
const uint8 completionCode = td->trb_completion_code;
switch (completionCode) {
case COMP_SHORT_PACKET:
case COMP_SUCCESS:
callbackStatus = B_OK;
@ -2938,18 +2939,19 @@ XHCI::FinishTransfers()
break;
}
size_t actualLength = transfer->DataLength();
if (td->trb_completion_code != COMP_SUCCESS) {
size_t actualLength = transfer->FragmentLength();
if (completionCode != COMP_SUCCESS) {
actualLength = td->td_transferred;
if (td->td_transferred == -1)
actualLength = transfer->DataLength() - td->trb_left;
actualLength = transfer->FragmentLength() - td->trb_left;
TRACE("transfer not successful, actualLength=%" B_PRIuSIZE "\n",
actualLength);
}
usb_isochronous_data* isochronousData = transfer->IsochronousData();
if (isochronousData != NULL) {
size_t packetSize = transfer->DataLength() / isochronousData->packet_count,
size_t packetSize = transfer->DataLength()
/ isochronousData->packet_count,
left = actualLength;
for (uint32 i = 0; i < isochronousData->packet_count; i++) {
size_t size = min_c(packetSize, left);
@ -2970,9 +2972,22 @@ XHCI::FinishTransfers()
callbackStatus = status;
}
}
transfer->Finished(callbackStatus, actualLength);
delete transfer;
FreeDescriptor(td);
// this transfer may still have data left
transfer->AdvanceByFragment(actualLength);
if (completionCode == COMP_SUCCESS
&& transfer->FragmentLength() > 0) {
TRACE("still %" B_PRIuSIZE " bytes left on transfer\n",
transfer->FragmentLength());
SubmitTransfer(transfer);
} else {
// The actualLength was already handled in AdvanceByFragment.
transfer->Finished(callbackStatus, 0);
delete transfer;
}
mutex_lock(&fFinishedLock);
}
mutex_unlock(&fFinishedLock);