309 lines
9.2 KiB
C
309 lines
9.2 KiB
C
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/*
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* vcisr.c
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*
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*
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* 32-bit Video Capture driver
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* kernel-mode support library - interrupt dispatch
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*
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* Geraint Davies, Feb 93
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*/
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#include <vckernel.h>
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#include "vckpriv.h"
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#include "profile.h"
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#if DBG
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extern profiling looptime;
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#endif
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/* interrupt service routine - returns TRUE if interrupt handled.
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* all interrupts come in here and are then dispatched to hw ack routine
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* the Context pointer is a pointer to DEVICE_INFO.
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*/
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BOOLEAN
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VC_InterruptService(
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IN PKINTERRUPT pInterruptObject,
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IN PVOID Context
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)
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{
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PDEVICE_INFO pDevInfo;
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pDevInfo = (PDEVICE_INFO)Context;
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/*
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* make sure that the hardware-specific code has installed
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* an ack routine
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*/
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if (pDevInfo->Callback.InterruptAcknowledge == NULL) {
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/* no isr - and yet we are getting interrupts -
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* we should disconnect the interrupt
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*/
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dprintf(("interrupt occured without h/w isr"));
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//IoDisconnectInterrupt(pDevInfo->InterruptObject);
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return(FALSE);
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}
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/*
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* call the acknowledge. this will not do any service, but will
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* return TRUE if the service routine is to be called.
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*/
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if (!pDevInfo->Callback.InterruptAcknowledge(pDevInfo)) {
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return(FALSE);
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}
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/* the isr reckons that it is time to schedule the service
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* routine. This is done on a DPC.
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*/
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if (pDevInfo->DpcRequested) {
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//dprintf5(("dpc overrun"));
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} else {
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pDevInfo->DpcRequested = TRUE;
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IoRequestDpc(pDevInfo->pDeviceObject, NULL, pDevInfo);
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}
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/* everything else is done in dpc routine */
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return(TRUE);
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}
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/*
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* DPC routine to do work for interrupt service. Scheduled because
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* hardware acknowledge routine said that it was time to call its
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* service routine.
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*
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* If there is an outstanding buffer, pass this to the h/w service
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* routine to fill, and then complete the irp.
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*
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* if there is no buffer, then we have to miss a frame. if there is an
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* outstanding wait-error request, then we can complete that to report
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* the overrun. If not, we just count one more unreported overrun
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* to save up for the next wait-error.
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*
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* If we have no buffer, we must still call the hardware capture routine,
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* with a NULL buffer pointer, so it can discard any data and re-arm for
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* capture.
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*
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* Note that the pIrpNotUsed is an arg passed from the IoRequestDpc call.
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* We don't work out which Irp to complete until this function, so
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* we ignore that. The context argument is a PDEVICE_INFO.
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*
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* The buffered parameter to the add-buffer irp is the CAPTUREBUFFER structure.
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* We need to store the bytes written, and the timestamp there. The
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* virtual address for the buffer has been locked down and is
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* represented by the Irp->MdlAddress. We mapped this ourselves but
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* we don't need to free it ourselves since we added it to the irp. the i/o
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* subsystem will unlock and free it when freeing the irp.
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*
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* Contention: see comment at top of vcdisp.c. We use the cancel spinlock
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* to protect accesses to the irp queues against contention from
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* passive-level requests, but we do not hold it for the entire
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* service routine.
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*/
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VOID
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VC_Deferred(
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PKDPC pDpc,
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PDEVICE_OBJECT pDeviceObject,
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PIRP pIrpNotUsed,
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PVOID Context
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)
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{
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PDEVICE_INFO pDevInfo;
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PIRP pIrp = NULL;
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PUCHAR pData;
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ULONG ulLength;
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PCAPTUREBUFFER pCapBuf;
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pDevInfo = (PDEVICE_INFO)Context;
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pDevInfo->DpcRequested = FALSE;
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/*
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* check that the h/w specific code has installed a service handler
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* some kind of internal error otherwise.
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*/
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if (pDevInfo->Callback.CaptureService == NULL) {
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dprintf(("dpc requested but no service routine"));
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return;
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}
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/*
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* if there is a system buffer and it is in use, then
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* we should fail to capture anything else
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*/
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if ((pDevInfo->pSystemBuffer != NULL) && (pDevInfo->SysBufInUse != 0)) {
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/* report overrun, same as for no-buffer cases */
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/*
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* notify the hardware portion that there is no buffer, so
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* he must throw away everything and re-arm.
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*/
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pDevInfo->Callback.CaptureService(pDevInfo, NULL, NULL, 0);
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/*
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* access to the skip count needs to be locked together
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* with access to the queue of wait-error requests. This function
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* increments the skip-count and completes a wait-error request
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* if there is one.
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*/
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VC_ReportSkip(pDevInfo);
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}
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/*
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* We need to interlock access to the queue using the Cancel
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* spinlock (see vcqueue.c) - but we don't need to interlock
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* the whole of this function.
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*
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* Any further contention between this code and the
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* passive-level code will be resolved by the h/wspecific code.
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*/
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/*
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* get the next irp from the queue
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*/
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pIrp = VC_ExtractNextIrp(&pDevInfo->BufferHead, FALSE);
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if (pIrp) {
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PIO_STACK_LOCATION pIoStack;
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ULONG IoCode;
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/*
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* is this cap_to_sysbuf or a real one ?
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*/
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pIoStack = IoGetCurrentIrpStackLocation(pIrp);
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IoCode = pIoStack->Parameters.DeviceIoControl.IoControlCode;
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if(IoCode == IOCTL_VIDC_ADD_BUFFER) {
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/* get the address of the callers buffer, mapped into
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* system memory
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*/
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pData = (PUCHAR) MmGetSystemAddressForMdl(pIrp->MdlAddress);
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if (pData == NULL) {
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dprintf(("MmGetSystemAddressforMdl failed in dpc"));
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pIrp->IoStatus.Information = 0;
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pIrp->IoStatus.Status = STATUS_NO_MEMORY;
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} else {
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/* get a pointer to the (buffered) CAPTUREBUFFER header */
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pCapBuf = (PCAPTUREBUFFER) pIrp->AssociatedIrp.SystemBuffer;
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/*
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* find the length of the data buffer
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*/
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ulLength = pCapBuf->BufferLength;
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//profile this call
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START_PROFILING(&looptime);
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pCapBuf->BytesUsed = (DWORD)
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pDevInfo->Callback.CaptureService(pDevInfo,
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pData,
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(PULONG) &pCapBuf->TimeCaptured,
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ulLength);
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STOP_PROFILING(&looptime);
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/* if a capture service routine returns 0, it means
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* that it has not completed this capture, and would like
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* the same buffer back for the next field if possible
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* - in this case, return the buffer to the start of the
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* queue
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*/
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if (pCapBuf->BytesUsed == 0) {
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if (VC_ReplaceRequest(pIrp, &pDevInfo->BufferHead, VC_Cancel)) {
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// nothing more to do till he gets another crack
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return;
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} else {
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// this irp has been cancelled
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pIrp->IoStatus.Status = STATUS_CANCELLED;
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pIrp->IoStatus.Information = 0;
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}
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} else {
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/* we copy back the CAPTUREBUFFER struct */
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pIrp->IoStatus.Information = sizeof(CAPTUREBUFFER);
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pIrp->IoStatus.Status = STATUS_SUCCESS;
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}
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}
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} else if (IoCode == IOCTL_VIDC_CAP_TO_SYSBUF) {
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if (pDevInfo->pSystemBuffer == NULL) {
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pIrp->IoStatus.Information = 0;
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pIrp->IoStatus.Status = STATUS_INVALID_DEVICE_STATE;
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} else {
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/*
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* capture to system buffer and complete request
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*/
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pDevInfo->SysBufInUse = 1;
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if (pDevInfo->Callback.CaptureService(
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pDevInfo,
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pDevInfo->pSystemBuffer,
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&pDevInfo->SysBufTimeStamp,
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pDevInfo->ImageSize) == 0) {
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// 0 return means please give me another go at this request
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if (VC_ReplaceRequest(pIrp, &pDevInfo->BufferHead, VC_Cancel)) {
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// nothing more to do till he gets another crack
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return;
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} else {
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// this irp has been cancelled
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pIrp->IoStatus.Status = STATUS_CANCELLED;
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}
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} else {
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pIrp->IoStatus.Status = STATUS_SUCCESS;
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}
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pIrp->IoStatus.Information = 0;
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}
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} else {
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/* unexpected irp */
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pIrp->IoStatus.Status = STATUS_DRIVER_INTERNAL_ERROR;
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}
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IoCompleteRequest(pIrp, IO_SOUND_INCREMENT);
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} else {
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/*
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* notify the hardware portion that there is no buffer, so
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* he must throw away everything and re-arm.
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*/
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pDevInfo->Callback.CaptureService(pDevInfo, NULL, NULL, 0);
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/*
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* access to the skip count needs to be locked together
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* with access to the queue of wait-error requests. This function
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* increments the skip-count and completes a wait-error request
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* if there is one.
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*/
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VC_ReportSkip(pDevInfo);
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}
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}
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