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Negate the logic of XCHAN_CAP_NOBUFS macro and rename it to

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XCHAN_CAP_BOUNCE.

The only application that uses bounce buffering for now is the Government
Furnished Equipment (GFE) P2's dma core (AXIDMA) with its own dedicated
cacheless bounce buffer.

Sponsored by:	DARPA, AFRL
This commit is contained in:
br 2019-07-04 14:04:08 +00:00
parent dd2eb48e68
commit 84fd1988a0
4 changed files with 10 additions and 10 deletions
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1
sys/dev/altera/softdma/softdma.c
View File

@ -616,7 +616,6 @@ softdma_channel_alloc(device_t dev, struct xdma_channel *xchan)
if (chan->used == 0) {
chan->xchan = xchan;
xchan->chan = (void *)chan;
xchan->caps |= XCHAN_CAP_NOBUFS;
xchan->caps |= XCHAN_CAP_NOSEG;
chan->index = i;
chan->idx_head = 0;

2
sys/dev/xdma/xdma.h
View File

@ -137,7 +137,7 @@ struct xdma_channel {
uint32_t caps;
#define XCHAN_CAP_BUSDMA (1 << 0)
#define XCHAN_CAP_NOSEG (1 << 1)
#define XCHAN_CAP_NOBUFS (1 << 2)
#define XCHAN_CAP_BOUNCE (1 << 2)
/* A real hardware driver channel. */
void *chan;

16
sys/dev/xdma/xdma_sg.c
View File

@ -290,7 +290,7 @@ xdma_prep_sg(xdma_channel_t *xchan, uint32_t xr_num,
}
/* Allocate buffers if required. */
if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0) {
if (xchan->caps & (XCHAN_CAP_BUSDMA | XCHAN_CAP_BOUNCE)) {
ret = xchan_bufs_alloc(xchan);
if (ret != 0) {
device_printf(xdma->dev,
@ -347,9 +347,8 @@ xchan_seg_done(xdma_channel_t *xchan,
bus_dmamap_sync(xchan->dma_tag_bufs, b->map,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(xchan->dma_tag_bufs, b->map);
} else {
if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0 &&
xr->req_type == XR_TYPE_MBUF &&
} else if (xchan->caps & XCHAN_CAP_BOUNCE) {
if (xr->req_type == XR_TYPE_MBUF &&
xr->direction == XDMA_DEV_TO_MEM)
m_copyback(xr->m, 0, st->transferred,
(void *)xr->buf.vaddr);
@ -494,13 +493,14 @@ _xdma_load_data(xdma_channel_t *xchan, struct xdma_request *xr,
switch (xr->req_type) {
case XR_TYPE_MBUF:
if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0) {
if (xchan->caps & XCHAN_CAP_BUSDMA)
seg[0].ds_addr = mtod(m, bus_addr_t);
else if (xchan->caps & XCHAN_CAP_BOUNCE) {
if (xr->direction == XDMA_MEM_TO_DEV)
m_copydata(m, 0, m->m_pkthdr.len,
(void *)xr->buf.vaddr);
seg[0].ds_addr = (bus_addr_t)xr->buf.paddr;
} else
seg[0].ds_addr = mtod(m, bus_addr_t);
}
seg[0].ds_len = m->m_pkthdr.len;
break;
case XR_TYPE_BIO:
@ -626,7 +626,7 @@ xdma_queue_submit_sg(xdma_channel_t *xchan)
sg = xchan->sg;
if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0 &&
if ((xchan->caps & (XCHAN_CAP_BOUNCE | XCHAN_CAP_BUSDMA)) &&
(xchan->flags & XCHAN_BUFS_ALLOCATED) == 0) {
device_printf(xdma->dev,
"%s: Can't submit a transfer: no bufs\n",

1
sys/dev/xilinx/axidma.c
View File

@ -399,6 +399,7 @@ axidma_channel_alloc(device_t dev, struct xdma_channel *xchan)
if (axidma_reset(sc, data->id) != 0)
return (-1);
chan->xchan = xchan;
xchan->caps |= XCHAN_CAP_BOUNCE;
xchan->chan = (void *)chan;
chan->sc = sc;
chan->used = true;