Author: hselasky
Date: Tue Nov 24 12:19:20 2015
New Revision: 291251
URL: https://svnweb.freebsd.org/changeset/base/291251
Log:
MFC r290326:
Relax the BUS_DMA_KEEP_PG_OFFSET requirement to allow optimising
allocation of DMA bounce buffers.
Discussed with: ian @
Modified:
stable/9/sys/dev/usb/usb_busdma.c
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/dev/ (props changed)
Modified: stable/9/sys/dev/usb/usb_busdma.c
==============================================================================
--- stable/9/sys/dev/usb/usb_busdma.c Tue Nov 24 12:17:00 2015
(r291250)
+++ stable/9/sys/dev/usb/usb_busdma.c Tue Nov 24 12:19:20 2015
(r291251)
@@ -468,9 +468,13 @@ usb_pc_common_mem_cb(void *arg, bus_dma_
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;
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