Commit 872e330e authored by Stefan Richter's avatar Stefan Richter
Browse files

firewire: add isochronous multichannel reception 



This adds the DMA context programming and userspace ABI for multichannel
reception, i.e. for listening on multiple channel numbers by means of a
single DMA context.

The use case is reception of more streams than there are IR DMA units
offered by the link layer.  This is already implemented by the older
ohci1394 + ieee1394 + raw1394 stack.  And as discussed recently on
linux1394-devel, this feature is occasionally used in practice.

The big drawbacks of this mode are that buffer layout and interrupt
generation necessarily differ from single-channel reception:  Headers
and trailers are not stripped from packets, packets are not aligned with
buffer chunks, interrupts are per buffer chunk, not per packet.

These drawbacks also cause a rather hefty code footprint to support this
rarely used OHCI-1394 feature.  (367 lines added, among them 94 lines of
added userspace ABI documentation.)

This implementation enforces that a multichannel reception context may
only listen to channels to which no single-channel context on the same
link layer is presently listening to.  OHCI-1394 would allow to overlay
single-channel contexts by the multi-channel context, but this would be
a departure from the present first-come-first-served policy of IR
context creation.

The implementation is heavily based on an earlier one by Jay Fenlason.
Thanks Jay.

Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent ae2a9766

drivers/firewire/core-cdev.c

+72 −21
Original line number Diff line number Diff line
@@ -193,6 +193,11 @@ struct iso_interrupt_event { 
	struct fw_cdev_event_iso_interrupt interrupt;

};



struct iso_interrupt_mc_event {

	struct event event;

	struct fw_cdev_event_iso_interrupt_mc interrupt;

};



struct iso_resource_event {

	struct event event;

	struct fw_cdev_event_iso_resource iso_resource;
@@ -415,6 +420,7 @@ union ioctl_arg { 
	struct fw_cdev_get_cycle_timer2		get_cycle_timer2;

	struct fw_cdev_send_phy_packet		send_phy_packet;

	struct fw_cdev_receive_phy_packets	receive_phy_packets;

	struct fw_cdev_set_iso_channels		set_iso_channels;

};



static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
@@ -932,26 +938,54 @@ static void iso_callback(struct fw_iso_context *context, u32 cycle, 
		    sizeof(e->interrupt) + header_length, NULL, 0);

}



static void iso_mc_callback(struct fw_iso_context *context,

			    dma_addr_t completed, void *data)

{

	struct client *client = data;

	struct iso_interrupt_mc_event *e;



	e = kmalloc(sizeof(*e), GFP_ATOMIC);

	if (e == NULL) {

		fw_notify("Out of memory when allocating event\n");

		return;

	}

	e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL;

	e->interrupt.closure   = client->iso_closure;

	e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer,

						      completed);

	queue_event(client, &e->event, &e->interrupt,

		    sizeof(e->interrupt), NULL, 0);

}



static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)

{

	struct fw_cdev_create_iso_context *a = &arg->create_iso_context;

	struct fw_iso_context *context;

	fw_iso_callback_t cb;



	BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||

		     FW_CDEV_ISO_CONTEXT_RECEIVE  != FW_ISO_CONTEXT_RECEIVE);

		     FW_CDEV_ISO_CONTEXT_RECEIVE  != FW_ISO_CONTEXT_RECEIVE  ||

		     FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL !=

					FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL);



	if (a->channel > 63)

	switch (a->type) {

	case FW_ISO_CONTEXT_TRANSMIT:

		if (a->speed > SCODE_3200 || a->channel > 63)

			return -EINVAL;



	switch (a->type) {

		cb = iso_callback;

		break;



	case FW_ISO_CONTEXT_RECEIVE:

		if (a->header_size < 4 || (a->header_size & 3))

		if (a->header_size < 4 || (a->header_size & 3) ||

		    a->channel > 63)

			return -EINVAL;



		cb = iso_callback;

		break;



	case FW_ISO_CONTEXT_TRANSMIT:

		if (a->speed > SCODE_3200)

			return -EINVAL;

	case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:

		cb = (fw_iso_callback_t)iso_mc_callback;

		break;



	default:
@@ -959,8 +993,7 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) 
	}



	context = fw_iso_context_create(client->device->card, a->type,

					a->channel, a->speed, a->header_size,

					iso_callback, client);

			a->channel, a->speed, a->header_size, cb, client);

	if (IS_ERR(context))

		return PTR_ERR(context);
@@ -980,6 +1013,17 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) 
	return 0;

}



static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg)

{

	struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels;

	struct fw_iso_context *ctx = client->iso_context;



	if (ctx == NULL || a->handle != 0)

		return -EINVAL;



	return fw_iso_context_set_channels(ctx, &a->channels);

}



/* Macros for decoding the iso packet control header. */

#define GET_PAYLOAD_LENGTH(v)	((v) & 0xffff)

#define GET_INTERRUPT(v)	(((v) >> 16) & 0x01)
@@ -993,7 +1037,7 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) 
	struct fw_cdev_queue_iso *a = &arg->queue_iso;

	struct fw_cdev_iso_packet __user *p, *end, *next;

	struct fw_iso_context *ctx = client->iso_context;

	unsigned long payload, buffer_end, transmit_header_bytes;

	unsigned long payload, buffer_end, transmit_header_bytes = 0;

	u32 control;

	int count;

	struct {
@@ -1013,7 +1057,6 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) 
	 * use the indirect payload, the iso buffer need not be mapped

	 * and the a->data pointer is ignored.

	 */



	payload = (unsigned long)a->data - client->vm_start;

	buffer_end = client->buffer.page_count << PAGE_SHIFT;

	if (a->data == 0 || client->buffer.pages == NULL ||
@@ -1022,8 +1065,10 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) 
		buffer_end = 0;

	}



	p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);

	if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3)

		return -EINVAL;



	p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);

	if (!access_ok(VERIFY_READ, p, a->size))

		return -EFAULT;
@@ -1039,19 +1084,24 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) 
		u.packet.sy = GET_SY(control);

		u.packet.header_length = GET_HEADER_LENGTH(control);



		if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {

			if (u.packet.header_length % 4 != 0)

		switch (ctx->type) {

		case FW_ISO_CONTEXT_TRANSMIT:

			if (u.packet.header_length & 3)

				return -EINVAL;

			transmit_header_bytes = u.packet.header_length;

		} else {

			/*

			 * We require that header_length is a multiple of

			 * the fixed header size, ctx->header_size.

			 */

			break;



		case FW_ISO_CONTEXT_RECEIVE:

			if (u.packet.header_length == 0 ||

			    u.packet.header_length % ctx->header_size != 0)

				return -EINVAL;

			transmit_header_bytes = 0;

			break;



		case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:

			if (u.packet.payload_length == 0 ||

			    u.packet.payload_length & 3)

				return -EINVAL;

			break;

		}



		next = (struct fw_cdev_iso_packet __user *)
@@ -1534,6 +1584,7 @@ static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = { 
	[0x14] = ioctl_get_cycle_timer2,

	[0x15] = ioctl_send_phy_packet,

	[0x16] = ioctl_receive_phy_packets,

	[0x17] = ioctl_set_iso_channels,

};



static int dispatch_ioctl(struct client *client,

drivers/firewire/core-iso.c

+25 −7
Original line number Diff line number Diff line
@@ -117,6 +117,23 @@ void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, 
}

EXPORT_SYMBOL(fw_iso_buffer_destroy);



/* Convert DMA address to offset into virtually contiguous buffer. */

size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed)

{

	int i;

	dma_addr_t address;

	ssize_t offset;



	for (i = 0; i < buffer->page_count; i++) {

		address = page_private(buffer->pages[i]);

		offset = (ssize_t)completed - (ssize_t)address;

		if (offset > 0 && offset <= PAGE_SIZE)

			return (i << PAGE_SHIFT) + offset;

	}



	return 0;

}



struct fw_iso_context *fw_iso_context_create(struct fw_card *card,

		int type, int channel, int speed, size_t header_size,

		fw_iso_callback_t callback, void *callback_data)
@@ -133,7 +150,7 @@ struct fw_iso_context *fw_iso_context_create(struct fw_card *card, 
	ctx->channel = channel;

	ctx->speed = speed;

	ctx->header_size = header_size;

	ctx->callback = callback;

	ctx->callback.sc = callback;

	ctx->callback_data = callback_data;



	return ctx;
@@ -142,9 +159,7 @@ EXPORT_SYMBOL(fw_iso_context_create); 


void fw_iso_context_destroy(struct fw_iso_context *ctx)

{

	struct fw_card *card = ctx->card;



	card->driver->free_iso_context(ctx);

	ctx->card->driver->free_iso_context(ctx);

}

EXPORT_SYMBOL(fw_iso_context_destroy);
@@ -155,14 +170,17 @@ int fw_iso_context_start(struct fw_iso_context *ctx, 
}

EXPORT_SYMBOL(fw_iso_context_start);



int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels)

{

	return ctx->card->driver->set_iso_channels(ctx, channels);

}



int fw_iso_context_queue(struct fw_iso_context *ctx,

			 struct fw_iso_packet *packet,

			 struct fw_iso_buffer *buffer,

			 unsigned long payload)

{

	struct fw_card *card = ctx->card;



	return card->driver->queue_iso(ctx, packet, buffer, payload);

	return ctx->card->driver->queue_iso(ctx, packet, buffer, payload);

}

EXPORT_SYMBOL(fw_iso_context_queue);

drivers/firewire/core.h

+2 −0
Original line number Diff line number Diff line
@@ -90,6 +90,8 @@ struct fw_card_driver { 
	int (*start_iso)(struct fw_iso_context *ctx,

			 s32 cycle, u32 sync, u32 tags);



	int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels);



	int (*queue_iso)(struct fw_iso_context *ctx,

			 struct fw_iso_packet *packet,

			 struct fw_iso_buffer *buffer,

drivers/firewire/ohci.c

+247 −69
Original line number Diff line number Diff line
@@ -190,11 +190,13 @@ struct fw_ohci { 
	struct context at_request_ctx;

	struct context at_response_ctx;



	u32 it_context_mask;

	u32 it_context_mask;     /* unoccupied IT contexts */

	struct iso_context *it_context_list;

	u64 ir_context_channels;

	u32 ir_context_mask;

	u64 ir_context_channels; /* unoccupied channels */

	u32 ir_context_mask;     /* unoccupied IR contexts */

	struct iso_context *ir_context_list;

	u64 mc_channels; /* channels in use by the multichannel IR context */

	bool mc_allocated;



	__be32    *config_rom;

	dma_addr_t config_rom_bus;
@@ -2197,10 +2199,9 @@ static int handle_ir_packet_per_buffer(struct context *context, 
	__le32 *ir_header;

	void *p;



	for (pd = d; pd <= last; pd++) {

	for (pd = d; pd <= last; pd++)

		if (pd->transfer_status)

			break;

	}

	if (pd > last)

		/* Descriptor(s) not done yet, stop iteration */

		return 0;
@@ -2210,7 +2211,7 @@ static int handle_ir_packet_per_buffer(struct context *context, 


	if (le16_to_cpu(last->control) & DESCRIPTOR_IRQ_ALWAYS) {

		ir_header = (__le32 *) p;

		ctx->base.callback(&ctx->base,

		ctx->base.callback.sc(&ctx->base,

				      le32_to_cpu(ir_header[0]) & 0xffff,

				      ctx->header_length, ctx->header,

				      ctx->base.callback_data);
@@ -2220,6 +2221,28 @@ static int handle_ir_packet_per_buffer(struct context *context, 
	return 1;

}



/* d == last because each descriptor block is only a single descriptor. */

static int handle_ir_buffer_fill(struct context *context,

				 struct descriptor *d,

				 struct descriptor *last)

{

	struct iso_context *ctx =

		container_of(context, struct iso_context, context);



	if (!last->transfer_status)

		/* Descriptor(s) not done yet, stop iteration */

		return 0;



	if (le16_to_cpu(last->control) & DESCRIPTOR_IRQ_ALWAYS)

		ctx->base.callback.mc(&ctx->base,

				      le32_to_cpu(last->data_address) +

				      le16_to_cpu(last->req_count) -

				      le16_to_cpu(last->res_count),

				      ctx->base.callback_data);



	return 1;

}



static int handle_it_packet(struct context *context,

			    struct descriptor *d,

			    struct descriptor *last)
@@ -2245,7 +2268,7 @@ static int handle_it_packet(struct context *context, 
		ctx->header_length += 4;

	}

	if (le16_to_cpu(last->control) & DESCRIPTOR_IRQ_ALWAYS) {

		ctx->base.callback(&ctx->base, le16_to_cpu(last->res_count),

		ctx->base.callback.sc(&ctx->base, le16_to_cpu(last->res_count),

				      ctx->header_length, ctx->header,

				      ctx->base.callback_data);

		ctx->header_length = 0;
@@ -2253,64 +2276,110 @@ static int handle_it_packet(struct context *context, 
	return 1;

}



static void set_multichannel_mask(struct fw_ohci *ohci, u64 channels)

{

	u32 hi = channels >> 32, lo = channels;



	reg_write(ohci, OHCI1394_IRMultiChanMaskHiClear, ~hi);

	reg_write(ohci, OHCI1394_IRMultiChanMaskLoClear, ~lo);

	reg_write(ohci, OHCI1394_IRMultiChanMaskHiSet, hi);

	reg_write(ohci, OHCI1394_IRMultiChanMaskLoSet, lo);

	mmiowb();

	ohci->mc_channels = channels;

}



static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,

				int type, int channel, size_t header_size)

{

	struct fw_ohci *ohci = fw_ohci(card);

	struct iso_context *ctx, *list;

	descriptor_callback_t callback;

	u64 *channels, dont_care = ~0ULL;

	u32 *mask, regs;

	struct iso_context *uninitialized_var(ctx);

	descriptor_callback_t uninitialized_var(callback);

	u64 *uninitialized_var(channels);

	u32 *uninitialized_var(mask), uninitialized_var(regs);

	unsigned long flags;

	int index, ret = -ENOMEM;

	int index, ret = -EBUSY;



	spin_lock_irqsave(&ohci->lock, flags);



	if (type == FW_ISO_CONTEXT_TRANSMIT) {

		channels = &dont_care;

	switch (type) {

	case FW_ISO_CONTEXT_TRANSMIT:

		mask     = &ohci->it_context_mask;

		list = ohci->it_context_list;

		callback = handle_it_packet;

	} else {

		index    = ffs(*mask) - 1;

		if (index >= 0) {

			*mask &= ~(1 << index);

			regs = OHCI1394_IsoXmitContextBase(index);

			ctx  = &ohci->it_context_list[index];

		}

		break;



	case FW_ISO_CONTEXT_RECEIVE:

		channels = &ohci->ir_context_channels;

		mask     = &ohci->ir_context_mask;

		list = ohci->ir_context_list;

		callback = handle_ir_packet_per_buffer;

	}



	spin_lock_irqsave(&ohci->lock, flags);

		index    = *channels & 1ULL << channel ? ffs(*mask) - 1 : -1;

		if (index >= 0) {

			*channels &= ~(1ULL << channel);

			*mask     &= ~(1 << index);

			regs = OHCI1394_IsoRcvContextBase(index);

			ctx  = &ohci->ir_context_list[index];

		}

		break;



	case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:

		mask     = &ohci->ir_context_mask;

		callback = handle_ir_buffer_fill;

		index    = !ohci->mc_allocated ? ffs(*mask) - 1 : -1;

		if (index >= 0) {

			ohci->mc_allocated = true;

			*mask &= ~(1 << index);

			regs = OHCI1394_IsoRcvContextBase(index);

			ctx  = &ohci->ir_context_list[index];

		}

		break;



	default:

		index = -1;

		ret = -ENOSYS;

	}



	spin_unlock_irqrestore(&ohci->lock, flags);



	if (index < 0)

		return ERR_PTR(-EBUSY);



	if (type == FW_ISO_CONTEXT_TRANSMIT)

		regs = OHCI1394_IsoXmitContextBase(index);

	else

		regs = OHCI1394_IsoRcvContextBase(index);

		return ERR_PTR(ret);



	ctx = &list[index];

	memset(ctx, 0, sizeof(*ctx));

	ctx->header_length = 0;

	ctx->header = (void *) __get_free_page(GFP_KERNEL);

	if (ctx->header == NULL)

	if (ctx->header == NULL) {

		ret = -ENOMEM;

		goto out;



	}

	ret = context_init(&ctx->context, ohci, regs, callback);

	if (ret < 0)

		goto out_with_header;



	if (type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)

		set_multichannel_mask(ohci, 0);



	return &ctx->base;



 out_with_header:

	free_page((unsigned long)ctx->header);

 out:

	spin_lock_irqsave(&ohci->lock, flags);



	switch (type) {

	case FW_ISO_CONTEXT_RECEIVE:

		*channels |= 1ULL << channel;

		break;



	case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:

		ohci->mc_allocated = false;

		break;

	}

	*mask |= 1 << index;



	spin_unlock_irqrestore(&ohci->lock, flags);



	return ERR_PTR(ret);
@@ -2321,10 +2390,11 @@ static int ohci_start_iso(struct fw_iso_context *base, 
{

	struct iso_context *ctx = container_of(base, struct iso_context, base);

	struct fw_ohci *ohci = ctx->context.ohci;

	u32 control, match;

	u32 control = IR_CONTEXT_ISOCH_HEADER, match;

	int index;



	if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {

	switch (ctx->base.type) {

	case FW_ISO_CONTEXT_TRANSMIT:

		index = ctx - ohci->it_context_list;

		match = 0;

		if (cycle >= 0)
@@ -2334,9 +2404,13 @@ static int ohci_start_iso(struct fw_iso_context *base, 
		reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 1 << index);

		reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << index);

		context_run(&ctx->context, match);

	} else {

		break;



	case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:

		control |= IR_CONTEXT_BUFFER_FILL|IR_CONTEXT_MULTI_CHANNEL_MODE;

		/* fall through */

	case FW_ISO_CONTEXT_RECEIVE:

		index = ctx - ohci->ir_context_list;

		control = IR_CONTEXT_ISOCH_HEADER;

		match = (tags << 28) | (sync << 8) | ctx->base.channel;

		if (cycle >= 0) {

			match |= (cycle & 0x07fff) << 12;
@@ -2347,6 +2421,7 @@ static int ohci_start_iso(struct fw_iso_context *base, 
		reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << index);

		reg_write(ohci, CONTEXT_MATCH(ctx->context.regs), match);

		context_run(&ctx->context, control);

		break;

	}



	return 0;
@@ -2358,12 +2433,17 @@ static int ohci_stop_iso(struct fw_iso_context *base) 
	struct iso_context *ctx = container_of(base, struct iso_context, base);

	int index;



	if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {

	switch (ctx->base.type) {

	case FW_ISO_CONTEXT_TRANSMIT:

		index = ctx - ohci->it_context_list;

		reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 1 << index);

	} else {

		break;



	case FW_ISO_CONTEXT_RECEIVE:

	case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:

		index = ctx - ohci->ir_context_list;

		reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 1 << index);

		break;

	}

	flush_writes(ohci);

	context_stop(&ctx->context);
@@ -2384,24 +2464,65 @@ static void ohci_free_iso_context(struct fw_iso_context *base) 


	spin_lock_irqsave(&ohci->lock, flags);



	if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {

	switch (base->type) {

	case FW_ISO_CONTEXT_TRANSMIT:

		index = ctx - ohci->it_context_list;

		ohci->it_context_mask |= 1 << index;

	} else {

		break;



	case FW_ISO_CONTEXT_RECEIVE:

		index = ctx - ohci->ir_context_list;

		ohci->ir_context_mask |= 1 << index;

		ohci->ir_context_channels |= 1ULL << base->channel;

		break;



	case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:

		index = ctx - ohci->ir_context_list;

		ohci->ir_context_mask |= 1 << index;

		ohci->ir_context_channels |= ohci->mc_channels;

		ohci->mc_channels = 0;

		ohci->mc_allocated = false;

		break;

	}



	spin_unlock_irqrestore(&ohci->lock, flags);

}



static int ohci_queue_iso_transmit(struct fw_iso_context *base,

static int ohci_set_iso_channels(struct fw_iso_context *base, u64 *channels)

{

	struct fw_ohci *ohci = fw_ohci(base->card);

	unsigned long flags;

	int ret;



	switch (base->type) {

	case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:



		spin_lock_irqsave(&ohci->lock, flags);



		/* Don't allow multichannel to grab other contexts' channels. */

		if (~ohci->ir_context_channels & ~ohci->mc_channels & *channels) {

			*channels = ohci->ir_context_channels;

			ret = -EBUSY;

		} else {

			set_multichannel_mask(ohci, *channels);

			ret = 0;

		}



		spin_unlock_irqrestore(&ohci->lock, flags);



		break;

	default:

		ret = -EINVAL;

	}



	return ret;

}



static int queue_iso_transmit(struct iso_context *ctx,

			      struct fw_iso_packet *packet,

			      struct fw_iso_buffer *buffer,

			      unsigned long payload)

{

	struct iso_context *ctx = container_of(base, struct iso_context, base);

	struct descriptor *d, *last, *pd;

	struct fw_iso_packet *p;

	__le32 *header;
@@ -2497,14 +2618,12 @@ static int ohci_queue_iso_transmit(struct fw_iso_context *base, 
	return 0;

}



static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base,

static int queue_iso_packet_per_buffer(struct iso_context *ctx,

				       struct fw_iso_packet *packet,

				       struct fw_iso_buffer *buffer,

				       unsigned long payload)

{

	struct iso_context *ctx = container_of(base, struct iso_context, base);

	struct descriptor *d, *pd;

	struct fw_iso_packet *p = packet;

	dma_addr_t d_bus, page_bus;

	u32 z, header_z, rest;

	int i, j, length;
@@ -2514,14 +2633,14 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base, 
	 * The OHCI controller puts the isochronous header and trailer in the

	 * buffer, so we need at least 8 bytes.

	 */

	packet_count = p->header_length / ctx->base.header_size;

	packet_count = packet->header_length / ctx->base.header_size;

	header_size  = max(ctx->base.header_size, (size_t)8);



	/* Get header size in number of descriptors. */

	header_z = DIV_ROUND_UP(header_size, sizeof(*d));

	page     = payload >> PAGE_SHIFT;

	offset   = payload & ~PAGE_MASK;

	payload_per_buffer = p->payload_length / packet_count;

	payload_per_buffer = packet->payload_length / packet_count;



	for (i = 0; i < packet_count; i++) {

		/* d points to the header descriptor */
@@ -2533,7 +2652,7 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base, 


		d->control      = cpu_to_le16(DESCRIPTOR_STATUS |

					      DESCRIPTOR_INPUT_MORE);

		if (p->skip && i == 0)

		if (packet->skip && i == 0)

			d->control |= cpu_to_le16(DESCRIPTOR_WAIT);

		d->req_count    = cpu_to_le16(header_size);

		d->res_count    = d->req_count;
@@ -2566,7 +2685,7 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base, 
		pd->control = cpu_to_le16(DESCRIPTOR_STATUS |

					  DESCRIPTOR_INPUT_LAST |

					  DESCRIPTOR_BRANCH_ALWAYS);

		if (p->interrupt && i == packet_count - 1)

		if (packet->interrupt && i == packet_count - 1)

			pd->control |= cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS);



		context_append(&ctx->context, d, z, header_z);
@@ -2575,6 +2694,58 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base, 
	return 0;

}



static int queue_iso_buffer_fill(struct iso_context *ctx,

				 struct fw_iso_packet *packet,

				 struct fw_iso_buffer *buffer,

				 unsigned long payload)

{

	struct descriptor *d;

	dma_addr_t d_bus, page_bus;

	int page, offset, rest, z, i, length;



	page   = payload >> PAGE_SHIFT;

	offset = payload & ~PAGE_MASK;

	rest   = packet->payload_length;



	/* We need one descriptor for each page in the buffer. */

	z = DIV_ROUND_UP(offset + rest, PAGE_SIZE);



	if (WARN_ON(offset & 3 || rest & 3 || page + z > buffer->page_count))

		return -EFAULT;



	for (i = 0; i < z; i++) {

		d = context_get_descriptors(&ctx->context, 1, &d_bus);

		if (d == NULL)

			return -ENOMEM;



		d->control = cpu_to_le16(DESCRIPTOR_INPUT_MORE |

					 DESCRIPTOR_BRANCH_ALWAYS);

		if (packet->skip && i == 0)

			d->control |= cpu_to_le16(DESCRIPTOR_WAIT);

		if (packet->interrupt && i == z - 1)

			d->control |= cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS);



		if (offset + rest < PAGE_SIZE)

			length = rest;

		else

			length = PAGE_SIZE - offset;

		d->req_count = cpu_to_le16(length);

		d->res_count = d->req_count;

		d->transfer_status = 0;



		page_bus = page_private(buffer->pages[page]);

		d->data_address = cpu_to_le32(page_bus + offset);



		rest -= length;

		offset = 0;

		page++;



		context_append(&ctx->context, d, 1, 0);

	}



	return 0;

}



static int ohci_queue_iso(struct fw_iso_context *base,

			  struct fw_iso_packet *packet,

			  struct fw_iso_buffer *buffer,
@@ -2582,14 +2753,20 @@ static int ohci_queue_iso(struct fw_iso_context *base, 
{

	struct iso_context *ctx = container_of(base, struct iso_context, base);

	unsigned long flags;

	int ret;

	int ret = -ENOSYS;



	spin_lock_irqsave(&ctx->context.ohci->lock, flags);

	if (base->type == FW_ISO_CONTEXT_TRANSMIT)

		ret = ohci_queue_iso_transmit(base, packet, buffer, payload);

	else

		ret = ohci_queue_iso_receive_packet_per_buffer(base, packet,

							buffer, payload);

	switch (base->type) {

	case FW_ISO_CONTEXT_TRANSMIT:

		ret = queue_iso_transmit(ctx, packet, buffer, payload);

		break;

	case FW_ISO_CONTEXT_RECEIVE:

		ret = queue_iso_packet_per_buffer(ctx, packet, buffer, payload);

		break;

	case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:

		ret = queue_iso_buffer_fill(ctx, packet, buffer, payload);

		break;

	}

	spin_unlock_irqrestore(&ctx->context.ohci->lock, flags);



	return ret;
@@ -2609,6 +2786,7 @@ static const struct fw_card_driver ohci_driver = { 


	.allocate_iso_context	= ohci_allocate_iso_context,

	.free_iso_context	= ohci_free_iso_context,

	.set_iso_channels	= ohci_set_iso_channels,

	.queue_iso		= ohci_queue_iso,

	.start_iso		= ohci_start_iso,

	.stop_iso		= ohci_stop_iso,

include/linux/firewire-cdev.h

+195 −86

File changed.

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