update iso API for multi-channel reception and new packet buffer layout
git-svn-id: svn://svn.linux1394.org/libraw1394/trunk@98 53a565d1-3bb7-0310-b661-cf11e63c67ab
This commit is contained in:
dmaas
parent
1dd7ffd1c8
commit
385413d23e
225
src/iso.c
225
src/iso.c
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@ -113,32 +113,39 @@ static int do_iso_init(raw1394handle_t handle,
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int channel,
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enum raw1394_iso_speed speed,
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int irq_interval,
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int xmit)
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int cmd)
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{
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size_t pgsize;
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unsigned int bufsize, stride;
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/* already initialized? */
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if(handle->iso_buffer)
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return -1;
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/* choose a power-of-two stride for the packet data buffer,
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so that an even number of packets fits on one page */
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for(stride = 4; stride < max_packet_size; stride *= 2);
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if(stride > getpagesize()) {
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errno = ENOMEM;
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return -1;
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}
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handle->iso_buf_stride = stride;
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handle->iso_status.config.data_buf_size = stride * buf_packets;
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handle->iso_status.config.buf_packets = buf_packets;
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handle->iso_status.config.max_packet_size = max_packet_size;
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handle->iso_status.config.channel = channel;
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handle->iso_status.config.speed = speed;
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handle->iso_status.config.irq_interval = irq_interval;
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if(ioctl(handle->fd, xmit ? RAW1394_ISO_XMIT_INIT : RAW1394_ISO_RECV_INIT, &handle->iso_status))
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if(ioctl(handle->fd, cmd, &handle->iso_status))
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return -1;
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handle->iso_buffer_bytes = handle->iso_status.config.buf_packets * handle->iso_status.buf_stride;
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/* make sure buffer is a multiple of the page size (for mmap) */
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pgsize = getpagesize();
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if(handle->iso_buffer_bytes % pgsize)
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handle->iso_buffer_bytes += pgsize - (handle->iso_buffer_bytes % pgsize);
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/* mmap the DMA buffer */
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handle->iso_buffer = mmap(NULL, handle->iso_buffer_bytes, PROT_READ | PROT_WRITE,
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/* (we assume the kernel sets buf_size to an even number of pages) */
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handle->iso_buffer = mmap(NULL,
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handle->iso_status.config.data_buf_size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED, handle->fd, 0);
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if(handle->iso_buffer == (unsigned char*) MAP_FAILED) {
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@ -171,14 +178,17 @@ int raw1394_iso_xmit_init(raw1394handle_t handle,
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raw1394_iso_xmit_handler_t handler,
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unsigned int buf_packets,
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unsigned int max_packet_size,
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int channel,
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unsigned char channel,
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enum raw1394_iso_speed speed,
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int irq_interval)
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{
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if(do_iso_init(handle, buf_packets, max_packet_size, channel, speed, irq_interval, 1))
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if(do_iso_init(handle, buf_packets, max_packet_size, channel, speed,
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irq_interval, RAW1394_ISO_XMIT_INIT))
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return -1;
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handle->iso_xmit_handler = handler;
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handle->next_packet = 0;
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return 0;
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}
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@ -197,17 +207,86 @@ int raw1394_iso_recv_init(raw1394handle_t handle,
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raw1394_iso_recv_handler_t handler,
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unsigned int buf_packets,
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unsigned int max_packet_size,
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int channel,
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unsigned char channel,
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int irq_interval)
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{
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/* any speed will work */
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if(do_iso_init(handle, buf_packets, max_packet_size, channel, RAW1394_ISO_SPEED_100, irq_interval, 0))
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if(do_iso_init(handle, buf_packets, max_packet_size, channel, RAW1394_ISO_SPEED_100,
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irq_interval, RAW1394_ISO_RECV_INIT))
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return -1;
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handle->iso_recv_handler = handler;
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return 0;
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}
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/**
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* raw1394_iso_multichannel_recv_init - initialize multi-channel isochronous reception
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* @handler: handler function for receiving packets
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* @buf_packets: number of isochronous packets to buffer
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* @max_packet_size: largest packet you need to handle, in bytes (not including the isochronous header)
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* @speed: speed at which to receive
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* @irq_interval: maximum latency of wake-ups, in packets (-1 if you don't care)
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*
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* Allocates all user and kernel resources necessary for isochronous reception.
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**/
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int raw1394_iso_multichannel_recv_init(raw1394handle_t handle,
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raw1394_iso_recv_handler_t handler,
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unsigned int buf_packets,
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unsigned int max_packet_size,
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int irq_interval)
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{
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/* any speed will work */
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if(do_iso_init(handle, buf_packets, max_packet_size, -1, RAW1394_ISO_SPEED_100,
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irq_interval, RAW1394_ISO_RECV_INIT))
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return -1;
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handle->iso_recv_handler = handler;
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return 0;
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}
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/**
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* raw1394_iso_recv_listen_channel - listen to a specific channel in multi-channel mode
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**/
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int raw1394_iso_recv_listen_channel(raw1394handle_t handle, unsigned char channel)
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{
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if(!handle->iso_buffer)
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return -1;
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if(!handle->iso_recv_handler)
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return -1;
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return ioctl(handle->fd, RAW1394_ISO_RECV_LISTEN_CHANNEL, channel);
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}
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/**
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* raw1394_iso_recv_unlisten_channel - stop listening to a specific channel in multi-channel mode
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**/
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int raw1394_iso_recv_unlisten_channel(raw1394handle_t handle, unsigned char channel)
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{
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if(!handle->iso_buffer)
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return -1;
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if(!handle->iso_recv_handler)
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return -1;
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return ioctl(handle->fd, RAW1394_ISO_RECV_UNLISTEN_CHANNEL, channel);
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}
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/**
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* raw1394_iso_recv_set_channel_mask - listen or unlisten to a whole bunch of channels at once
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* @mask: 64-bit mask of channels, 1 means listen, 0 means unlisten,
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* channel 0 is LSB, channel 63 is MSB
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*
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* for multi-channel reception mode only
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**/
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int raw1394_iso_recv_set_channel_mask(raw1394handle_t handle, u_int64_t mask)
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{
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if(!handle->iso_buffer)
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return -1;
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if(!handle->iso_recv_handler)
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return -1;
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return ioctl(handle->fd, RAW1394_ISO_RECV_SET_CHANNEL_MASK, (void*) &mask);
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}
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/**
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* raw1394_iso_recv_start - begin isochronous reception
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* @start_on_cycle: isochronous cycle number on which to start (-1 if you don't care)
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@ -229,67 +308,66 @@ int raw1394_iso_recv_start(raw1394handle_t handle, int start_on_cycle)
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static int _raw1394_iso_xmit_queue_packets(raw1394handle_t handle)
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{
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struct raw1394_iso_status *stat = &handle->iso_status;
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int retval = 0, packets_done = 0;
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struct raw1394_iso_packets packets;
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int retval = -1;
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if(!handle->iso_buffer)
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return -1;
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goto out;
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if(!handle->iso_xmit_handler)
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return -1;
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goto out;
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/* we could potentially send up to stat->n_packets packets */
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packets.n_packets = 0;
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packets.infos = malloc(stat->n_packets * sizeof(struct raw1394_iso_packet_info));
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if(packets.infos == NULL)
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goto out;
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while(stat->n_packets > 0) {
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enum raw1394_iso_disposition disp;
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unsigned char *packet_data;
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struct raw1394_iso_packet_info *info;
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unsigned int len;
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unsigned char tag, sy;
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packet_data = handle->iso_buffer + stat->first_packet * stat->buf_stride
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+ stat->packet_data_offset;
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struct raw1394_iso_packet_info *info = &packets.infos[packets.n_packets];
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info = (struct raw1394_iso_packet_info*) (handle->iso_buffer
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+ stat->first_packet * stat->buf_stride
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+ stat->packet_info_offset);
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info->offset = handle->iso_buf_stride * handle->next_packet;
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/* call handler */
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disp = handle->iso_xmit_handler(handle,
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packet_data,
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&len, &tag, &sy,
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info->cycle,
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handle->iso_buffer + info->offset,
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&len,
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&info->tag, &info->sy,
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stat->xmit_cycle,
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_raw1394_iso_dropped(handle));
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/* check if packet is too long */
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if(len > stat->config.max_packet_size) {
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retval = -1;
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break;
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}
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/* set packet metadata */
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info->len = len;
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info->tag = tag;
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info->sy = sy;
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/* advance packet cursors and cycle counter */
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stat->n_packets--;
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stat->first_packet = (stat->first_packet + 1) % stat->config.buf_packets;
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packets_done++;
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handle->next_packet = (handle->next_packet + 1) % stat->config.buf_packets;
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if(stat->xmit_cycle != -1)
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stat->xmit_cycle = (stat->xmit_cycle + 1) % 8000;
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packets.n_packets++;
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if(disp == RAW1394_ISO_DEFER) {
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/* queue an event so that we don't hang in the next read() */
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if(ioctl(handle->fd, RAW1394_ISO_QUEUE_ACTIVITY, 0))
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return -1;
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goto out_produce;
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break;
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} else if(disp == RAW1394_ISO_ERROR) {
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retval = -1;
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break;
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goto out_produce;
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}
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}
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if(packets_done > 0) {
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if(ioctl(handle->fd, RAW1394_ISO_PRODUCE_CONSUME, packets_done))
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return -1;
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}
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/* success */
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retval = 0;
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out_produce:
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if(packets.n_packets > 0) {
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if(ioctl(handle->fd, RAW1394_ISO_XMIT_PACKETS, &packets))
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retval = -1;
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}
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out_free:
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free(packets.infos);
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out:
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return retval;
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}
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@ -335,7 +413,7 @@ void raw1394_iso_shutdown(raw1394handle_t handle)
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{
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if(handle->iso_buffer) {
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raw1394_iso_stop(handle);
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munmap(handle->iso_buffer, handle->iso_buffer_bytes);
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munmap(handle->iso_buffer, handle->iso_status.config.data_buf_size);
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ioctl(handle->fd, RAW1394_ISO_SHUTDOWN, 0);
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handle->iso_buffer = NULL;
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}
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@ -344,31 +422,34 @@ void raw1394_iso_shutdown(raw1394handle_t handle)
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static int _raw1394_iso_recv_packets(raw1394handle_t handle)
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{
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struct raw1394_iso_status *stat = &handle->iso_status;
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struct raw1394_iso_packet_info *info;
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struct raw1394_iso_packets packets;
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int retval = 0, packets_done = 0;
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int retval = -1, packets_done = 0;
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if(!handle->iso_buffer)
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return -1;
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goto out;
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if(!handle->iso_recv_handler)
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return -1;
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goto out;
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/* ask the kernel to fill an array with packet info structs */
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packets.n_packets = stat->n_packets;
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packets.infos = malloc(packets.n_packets * sizeof(struct raw1394_iso_packet_info));
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if(packets.infos == NULL)
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goto out;
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if(ioctl(handle->fd, RAW1394_ISO_RECV_PACKETS, &packets) < 0)
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goto out_free;
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while(stat->n_packets > 0) {
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unsigned char *packet_data;
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struct raw1394_iso_packet_info *info;
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enum raw1394_iso_disposition disp;
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packet_data = handle->iso_buffer + stat->first_packet * stat->buf_stride
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+ stat->packet_data_offset;
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info = (struct raw1394_iso_packet_info*) (handle->iso_buffer
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+ stat->first_packet * stat->buf_stride
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+ stat->packet_info_offset);
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info = &packets.infos[packets_done];
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/* call handler */
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disp = handle->iso_recv_handler(handle,
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packet_data,
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handle->iso_buffer + info->offset,
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info->len, info->channel,
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info->tag, info->sy,
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info->cycle,
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@ -376,25 +457,29 @@ static int _raw1394_iso_recv_packets(raw1394handle_t handle)
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/* advance packet cursors */
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stat->n_packets--;
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stat->first_packet = (stat->first_packet + 1) % stat->config.buf_packets;
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packets_done++;
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if(disp == RAW1394_ISO_DEFER) {
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/* queue an event so that we don't hang in the next read() */
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if(ioctl(handle->fd, RAW1394_ISO_QUEUE_ACTIVITY, 0))
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return -1;
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goto out_consume;
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break;
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} else if(disp == RAW1394_ISO_ERROR) {
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retval = -1;
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break;
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goto out_consume;
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}
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}
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if(packets_done > 0) {
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if(ioctl(handle->fd, RAW1394_ISO_PRODUCE_CONSUME, packets_done))
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return -1;
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}
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/* success */
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retval = 0;
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out_consume:
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if(packets_done > 0) {
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if(ioctl(handle->fd, RAW1394_ISO_RECV_RELEASE_PACKETS, packets_done))
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retval = -1;
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}
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out_free:
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free(packets.infos);
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out:
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return retval;
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}
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@ -118,31 +118,53 @@ typedef struct arm_request_response {
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/* rawiso API */
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/* ioctls */
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#define RAW1394_ISO_XMIT_INIT 1 /* arg: raw1394_iso_status* */
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#define RAW1394_ISO_RECV_INIT 2 /* arg: raw1394_iso_status* */
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#define RAW1394_ISO_RECV_START 3 /* arg: int, starting cycle */
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#define RAW1394_ISO_XMIT_START 8 /* arg: int[2], { starting cycle, prebuffer } */
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#define RAW1394_ISO_STOP 4
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#define RAW1394_ISO_GET_STATUS 5 /* arg: raw1394_iso_status* */
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#define RAW1394_ISO_PRODUCE_CONSUME 6 /* arg: int, # of packets */
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#define RAW1394_ISO_SHUTDOWN 7
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#define RAW1394_ISO_QUEUE_ACTIVITY 9
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#define RAW1394_ISO_XMIT_INIT 1 /* arg: raw1394_iso_status* */
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#define RAW1394_ISO_RECV_INIT 2 /* arg: raw1394_iso_status* */
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#define RAW1394_ISO_RECV_START 3 /* arg: int, starting cycle */
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#define RAW1394_ISO_XMIT_START 8 /* arg: int[2], { starting cycle, prebuffer } */
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#define RAW1394_ISO_STOP 4
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#define RAW1394_ISO_GET_STATUS 5 /* arg: raw1394_iso_status* */
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#define RAW1394_ISO_PRODUCE_CONSUME 6 /* no longer used */
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#define RAW1394_ISO_SHUTDOWN 7
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#define RAW1394_ISO_QUEUE_ACTIVITY 9
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#define RAW1394_ISO_RECV_LISTEN_CHANNEL 10 /* arg: channel number */
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#define RAW1394_ISO_RECV_UNLISTEN_CHANNEL 11 /* arg: channel number */
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#define RAW1394_ISO_RECV_SET_CHANNEL_MASK 12 /* arg: pointer to 64-bit mask */
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#define RAW1394_ISO_RECV_PACKETS 13 /* arg: struct raw1394_iso_packets* */
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#define RAW1394_ISO_RECV_RELEASE_PACKETS 14 /* arg: int n_packets */
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#define RAW1394_ISO_XMIT_PACKETS 15 /* arg: struct raw1394_iso_packets* */
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/* per-packet metadata embedded in the ringbuffer */
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/* must be identical to hpsb_iso_packet_info in iso.h! */
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struct raw1394_iso_packet_info {
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__u32 offset;
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__u16 len;
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__u16 cycle;
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__u16 cycle; /* recv only */
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__u8 channel; /* recv only */
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__u8 tag;
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__u8 sy;
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__u8 sy;
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};
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/* argument for RAW1394_ISO_RECV/XMIT_PACKETS ioctls */
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struct raw1394_iso_packets {
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__u32 n_packets;
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struct raw1394_iso_packet_info *infos;
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};
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struct raw1394_iso_config {
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/* size of packet data buffer, in bytes (will be rounded up to PAGE_SIZE) */
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__u32 data_buf_size;
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/* # of packets to buffer */
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__u32 buf_packets;
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__u32 max_packet_size;
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__u32 channel;
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__u32 speed; /* xmit only */
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/* iso channel (set to -1 for multi-channel recv) */
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__s32 channel;
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/* xmit only - iso transmission speed */
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__u8 speed;
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/* max. latency of buffer, in packets (-1 if you don't care) */
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__s32 irq_interval;
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};
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@ -151,19 +173,6 @@ struct raw1394_iso_status {
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/* current settings */
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struct raw1394_iso_config config;
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/* byte offset between successive packets in the buffer */
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__s32 buf_stride;
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/* byte offset of data payload within each packet */
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__s32 packet_data_offset;
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/* byte offset of struct iso_packet_info within each packet */
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__s32 packet_info_offset;
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/* index of next packet to fill with data (ISO transmission)
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or next packet containing data recieved (ISO reception) */
|
||||
__u32 first_packet;
|
||||
|
||||
/* number of packets waiting to be filled with data (ISO transmission)
|
||||
or containing data received (ISO reception) */
|
||||
__u32 n_packets;
|
||||
|
|
@ -172,6 +181,10 @@ struct raw1394_iso_status {
|
|||
underflow of the packet buffer (a value of zero guarantees
|
||||
that no packets have been dropped) */
|
||||
__u32 overflows;
|
||||
|
||||
/* cycle number at which next packet will be transmitted;
|
||||
-1 if not known */
|
||||
__s16 xmit_cycle;
|
||||
};
|
||||
|
||||
#endif /* IEEE1394_RAW1394_H */
|
||||
|
|
|
|||
|
|
@ -55,7 +55,7 @@ enum raw1394_iso_speed {
|
|||
RAW1394_ISO_SPEED_400 = 2,
|
||||
};
|
||||
|
||||
/* return values from xmit/recv handlers */
|
||||
/* return values from isochronous xmit/recv handlers */
|
||||
|
||||
enum raw1394_iso_disposition {
|
||||
/* continue on to the next packet */
|
||||
|
|
@ -72,12 +72,14 @@ enum raw1394_iso_disposition {
|
|||
extern "C" {
|
||||
#endif
|
||||
|
||||
/* handlers for transmitting/receiving isochronous packets */
|
||||
|
||||
typedef enum raw1394_iso_disposition (*raw1394_iso_xmit_handler_t)(raw1394handle_t,
|
||||
unsigned char *data,
|
||||
unsigned int *len,
|
||||
unsigned char *tag,
|
||||
unsigned char *sy,
|
||||
unsigned int cycle,
|
||||
int cycle, /* -1 if unknown */
|
||||
unsigned int dropped);
|
||||
|
||||
typedef enum raw1394_iso_disposition (*raw1394_iso_recv_handler_t)(raw1394handle_t,
|
||||
|
|
@ -93,7 +95,7 @@ int raw1394_iso_xmit_init(raw1394handle_t handle,
|
|||
raw1394_iso_xmit_handler_t handler,
|
||||
unsigned int buf_packets,
|
||||
unsigned int max_packet_size,
|
||||
int channel,
|
||||
unsigned char channel,
|
||||
enum raw1394_iso_speed speed,
|
||||
int irq_interval);
|
||||
|
||||
|
|
@ -101,9 +103,19 @@ int raw1394_iso_recv_init(raw1394handle_t handle,
|
|||
raw1394_iso_recv_handler_t handler,
|
||||
unsigned int buf_packets,
|
||||
unsigned int max_packet_size,
|
||||
int channel,
|
||||
unsigned char channel,
|
||||
int irq_interval);
|
||||
|
||||
int raw1394_iso_multichannel_recv_init(raw1394handle_t handle,
|
||||
raw1394_iso_recv_handler_t handler,
|
||||
unsigned int buf_packets,
|
||||
unsigned int max_packet_size,
|
||||
int irq_interval);
|
||||
|
||||
/* listen/unlisten on a specific channel (multi-channel mode ONLY) */
|
||||
int raw1394_iso_recv_listen_channel(raw1394handle_t handle, unsigned char channel);
|
||||
int raw1394_iso_recv_unlisten_channel(raw1394handle_t handle, unsigned char channel);
|
||||
int raw1394_iso_recv_set_channel_mask(raw1394handle_t handle, u_int64_t mask);
|
||||
|
||||
int raw1394_iso_xmit_start(raw1394handle_t handle, int start_on_cycle, int prebuffer_packets);
|
||||
int raw1394_iso_recv_start(raw1394handle_t handle, int start_on_cycle);
|
||||
|
|
|
|||
|
|
@ -27,7 +27,10 @@ struct raw1394_handle {
|
|||
|
||||
/* memory mapping of the DMA buffer */
|
||||
unsigned char *iso_buffer;
|
||||
unsigned long iso_buffer_bytes;
|
||||
|
||||
/* iso XMIT only: */
|
||||
unsigned int iso_buf_stride; /* offset between successive packets */
|
||||
unsigned int next_packet; /* index of next packet to be transmitted */
|
||||
|
||||
/* status buffer, updated from _raw1394_iso_iterate() */
|
||||
struct raw1394_iso_status iso_status;
|
||||
|
|
|
|||
Reference in New Issue