Author: jah
Date: Tue Oct 13 02:17:56 2015
New Revision: 289202
URL: https://svnweb.freebsd.org/changeset/base/289202
Log:
Ensure the client regions for unmapped bounce buffers created through
bus_dmamap_load_phys() do not span multiple pages.
This is already done for mapped buffers.
While here, stop casting bus_addr_t to vm_offset_t.
Modified:
head/sys/x86/x86/busdma_bounce.c
Modified: head/sys/x86/x86/busdma_bounce.c
==============================================================================
--- head/sys/x86/x86/busdma_bounce.c Tue Oct 13 01:04:38 2015
(r289201)
+++ head/sys/x86/x86/busdma_bounce.c Tue Oct 13 02:17:56 2015
(r289202)
@@ -476,7 +476,8 @@ _bus_dmamap_count_phys(bus_dma_tag_t dma
while (buflen != 0) {
sgsize = MIN(buflen, dmat->common.maxsegsz);
if (bus_dma_run_filter(&dmat->common, curaddr)) {
- sgsize = MIN(sgsize, PAGE_SIZE);
+ sgsize = MIN(sgsize,
+ PAGE_SIZE - (curaddr & PAGE_MASK));
map->pagesneeded++;
}
curaddr += sgsize;
@@ -630,7 +631,7 @@ bounce_bus_dmamap_load_phys(bus_dma_tag_
if (((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0) &&
map->pagesneeded != 0 &&
bus_dma_run_filter(&dmat->common, curaddr)) {
- sgsize = MIN(sgsize, PAGE_SIZE);
+ sgsize = MIN(sgsize, PAGE_SIZE - (curaddr & PAGE_MASK));
curaddr = add_bounce_page(dmat, map, 0, curaddr,
sgsize);
}
@@ -694,7 +695,7 @@ bounce_bus_dmamap_load_buffer(bus_dma_ta
* Compute the segment size, and adjust counts.
*/
max_sgsize = MIN(buflen, dmat->common.maxsegsz);
- sgsize = PAGE_SIZE - ((vm_offset_t)curaddr & PAGE_MASK);
+ sgsize = PAGE_SIZE - (curaddr & PAGE_MASK);
if (((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0) &&
map->pagesneeded != 0 &&
bus_dma_run_filter(&dmat->common, curaddr)) {
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