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Honor the BUS_DMA_NOCACHE flag to bus_dmamem_alloc() on amd64 and i386 by

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mapping the pages as UC (uncacheable) using pmap_change_attr().

MFC after:	1 week
Requested by:	ariff
Reviewed by:	scottl
This commit is contained in:
John Baldwin 2007-04-17 21:05:34 +00:00
parent 39db4c6e0f
commit 88a5255bc4
2 changed files with 10 additions and 0 deletions
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5
sys/amd64/amd64/busdma_machdep.c
View File

@ -48,6 +48,7 @@ __FBSDID("$FreeBSD$");
#include <machine/atomic.h>
#include <machine/bus.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
#define MAX_BPAGES 8192
@ -522,6 +523,9 @@ bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
} else if ((uintptr_t)*vaddr & (dmat->alignment - 1)) {
printf("bus_dmamem_alloc failed to align memory properly.\n");
}
if (flags & BUS_DMA_NOCACHE)
pmap_change_attr((vm_offset_t)*vaddr, dmat->maxsize,
PAT_UNCACHEABLE);
CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
__func__, dmat, dmat->flags, ENOMEM);
return (0);
@ -540,6 +544,7 @@ bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
*/
if (map != NULL)
panic("bus_dmamem_free: Invalid map freed\n");
pmap_change_attr((vm_offset_t)vaddr, dmat->maxsize, PAT_WRITE_BACK);
if ((dmat->maxsize <= PAGE_SIZE) &&
(dmat->alignment < dmat->maxsize) &&
dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem))

5
sys/i386/i386/busdma_machdep.c
View File

@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
#include <machine/atomic.h>
#include <machine/bus.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
#define MAX_BPAGES 512
#define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3
@ -530,6 +531,9 @@ bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
} else if ((uintptr_t)*vaddr & (dmat->alignment - 1)) {
printf("bus_dmamem_alloc failed to align memory properly.\n");
}
if (flags & BUS_DMA_NOCACHE)
pmap_change_attr((vm_offset_t)*vaddr, dmat->maxsize,
PAT_UNCACHEABLE);
CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
__func__, dmat, dmat->flags, ENOMEM);
return (0);
@ -548,6 +552,7 @@ bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
*/
if (map != NULL)
panic("bus_dmamem_free: Invalid map freed\n");
pmap_change_attr((vm_offset_t)vaddr, dmat->maxsize, PAT_WRITE_BACK);
if ((dmat->maxsize <= PAGE_SIZE) &&
(dmat->alignment < dmat->maxsize) &&
dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem))