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Relax the BUS_DMA_KEEP_PG_OFFSET requirement to allow optimising

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allocation of DMA bounce buffers.

Discussed with:	ian @
MFC after:	3 weeks
This commit is contained in:
Hans Petter Selasky 2015-11-03 08:42:43 +00:00
parent ff4cdb1595
commit a2aa9bebf1
1 changed files with 6 additions and 2 deletions
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8
sys/dev/usb/usb_busdma.c
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@ -443,9 +443,13 @@ usb_pc_common_mem_cb(void *arg, bus_dma_segment_t *segs,
pc->page_offset_buf = rem;
pc->page_offset_end += rem;
#ifdef USB_DEBUG
if (rem != (USB_P2U(pc->buffer) & (USB_PAGE_SIZE - 1))) {
if (nseg > 1 &&
((segs->ds_addr + segs->ds_len) & (USB_PAGE_SIZE - 1)) !=
((segs + 1)->ds_addr & (USB_PAGE_SIZE - 1))) {
/*
* This check verifies that the physical address is correct:
* This check verifies there is no page offset hole
* between the first and second segment. See the
* BUS_DMA_KEEP_PG_OFFSET flag.
*/
DPRINTFN(0, "Page offset was not preserved\n");
error = 1;