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Restore bus DMA bounce pages to an offset of 0 when they are released by

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a tag that has BUS_DMA_KEEP_PG_OFFSET set.  Otherwise the page could be
reused with a non-zero offset by a tag that doesn't have
BUS_DMA_KEEP_PG_OFFSET leading to data corruption.

Sleuthing by:	avg
Reviewed by:	scottl
This commit is contained in:
John Baldwin 2009-04-17 13:22:18 +00:00
parent e932b25b93
commit 842f11bef6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=191201
4 changed files with 40 additions and 12 deletions
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13
sys/amd64/amd64/busdma_machdep.c
View File

@ -1137,9 +1137,7 @@ add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr,
mtx_unlock(&bounce_lock);
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
/* page offset needs to be preserved */
bpage->vaddr &= ~PAGE_MASK;
bpage->busaddr &= ~PAGE_MASK;
/* Page offset needs to be preserved. */
bpage->vaddr |= vaddr & PAGE_MASK;
bpage->busaddr |= vaddr & PAGE_MASK;
}
@ -1158,6 +1156,15 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
bpage->datacount = 0;
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
/*
* Reset the bounce page to start at offset 0. Other uses
* of this bounce page may need to store a full page of
* data and/or assume it starts on a page boundary.
*/
bpage->vaddr &= ~PAGE_MASK;
bpage->busaddr &= ~PAGE_MASK;
}
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);

13
sys/arm/arm/busdma_machdep.c
View File

@ -1427,9 +1427,7 @@ add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr,
mtx_unlock(&bounce_lock);
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
/* page offset needs to be preserved */
bpage->vaddr &= ~PAGE_MASK;
bpage->busaddr &= ~PAGE_MASK;
/* Page offset needs to be preserved. */
bpage->vaddr |= vaddr & PAGE_MASK;
bpage->busaddr |= vaddr & PAGE_MASK;
}
@ -1448,6 +1446,15 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
bpage->datacount = 0;
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
/*
* Reset the bounce page to start at offset 0. Other uses
* of this bounce page may need to store a full page of
* data and/or assume it starts on a page boundary.
*/
bpage->vaddr &= ~PAGE_MASK;
bpage->busaddr &= ~PAGE_MASK;
}
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);

13
sys/i386/i386/busdma_machdep.c
View File

@ -1155,9 +1155,7 @@ add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr,
mtx_unlock(&bounce_lock);
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
/* page offset needs to be preserved */
bpage->vaddr &= ~PAGE_MASK;
bpage->busaddr &= ~PAGE_MASK;
/* Page offset needs to be preserved. */
bpage->vaddr |= vaddr & PAGE_MASK;
bpage->busaddr |= vaddr & PAGE_MASK;
}
@ -1176,6 +1174,15 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
bpage->datacount = 0;
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
/*
* Reset the bounce page to start at offset 0. Other uses
* of this bounce page may need to store a full page of
* data and/or assume it starts on a page boundary.
*/
bpage->vaddr &= ~PAGE_MASK;
bpage->busaddr &= ~PAGE_MASK;
}
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);

13
sys/ia64/ia64/busdma_machdep.c
View File

@ -940,9 +940,7 @@ add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr,
mtx_unlock(&bounce_lock);
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
/* page offset needs to be preserved */
bpage->vaddr &= ~PAGE_MASK;
bpage->busaddr &= ~PAGE_MASK;
/* Page offset needs to be preserved. */
bpage->vaddr |= vaddr & PAGE_MASK;
bpage->busaddr |= vaddr & PAGE_MASK;
}
@ -959,6 +957,15 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bpage->datavaddr = 0;
bpage->datacount = 0;
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
/*
* Reset the bounce page to start at offset 0. Other uses
* of this bounce page may need to store a full page of
* data and/or assume it starts on a page boundary.
*/
bpage->vaddr &= ~PAGE_MASK;
bpage->busaddr &= ~PAGE_MASK;
}
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bounce_page_list, bpage, links);