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Implement bus_dmamem_* functions and correct a few nits reported by Peter Wemm.

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This commit is contained in:
Justin T. Gibbs 1998-05-06 01:45:55 +00:00
parent bd7b49d9bd
commit 8fddb21ee2
11 changed files with 419 additions and 132 deletions
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109
sys/amd64/amd64/busdma_machdep.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: busdma_machdep.c,v 1.4 1998/02/20 13:11:47 bde Exp $
* $Id: busdma_machdep.c,v 1.5 1998/04/17 22:36:26 des Exp $
*/
#include <sys/param.h>
@ -43,13 +43,14 @@
struct bus_dma_tag {
bus_dma_tag_t parent;
bus_size_t alignment;
bus_size_t boundary;
bus_addr_t lowaddr;
bus_addr_t highaddr;
bus_dma_filter_t *filter;
void *filterarg;
bus_size_t maxsize;
int nsegments;
u_int nsegments;
bus_size_t maxsegsz;
int flags;
int ref_count;
@ -114,15 +115,16 @@ run_filter(bus_dma_tag_t dmat, bus_addr_t paddr)
return (retval);
}
#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4
/*
* Allocate a device specific dma_tag.
*/
int
bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filter, void *filterarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat)
bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filter,
void *filterarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat)
{
bus_dma_tag_t newtag;
int error = 0;
@ -155,7 +157,7 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
* XXX Not really correct??? Probably need to honor boundary
* all the way up the inheritence chain.
*/
newtag->boundary = MIN(parent->boundary, newtag->boundary);
newtag->boundary = MAX(parent->boundary, newtag->boundary);
if (newtag->filter == NULL) {
/*
* Short circuit looking at our parent directly
@ -170,7 +172,7 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
}
}
if (newtag->lowaddr < ptoa(Maxmem)) {
if (newtag->lowaddr < ptoa(Maxmem) && (flags & BUS_DMA_ALLOCNOW) != 0) {
/* Must bounce */
if (lowaddr > bounce_lowaddr) {
@ -178,7 +180,7 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
* Go through the pool and kill any pages
* that don't reside below lowaddr.
*/
panic("bus_dmamap_create: page reallocation "
panic("bus_dma_tag_create: page reallocation "
"not implemented");
}
if (ptoa(total_bpages) < maxsize) {
@ -190,6 +192,8 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
if (alloc_bounce_pages(newtag, pages) < pages)
error = ENOMEM;
}
/* Performed initial allocation */
newtag->flags |= BUS_DMA_MIN_ALLOC_COMP;
}
if (error != 0) {
@ -240,7 +244,7 @@ bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
*mapp = (bus_dmamap_t)malloc(sizeof(**mapp), M_DEVBUF,
M_NOWAIT);
if (*mapp == NULL) {
error = ENOMEM;
return (ENOMEM);
} else {
/* Initialize the new map */
bzero(*mapp, sizeof(**mapp));
@ -251,16 +255,32 @@ bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
* basis up to a sane limit.
*/
maxpages = MIN(MAX_BPAGES, Maxmem - atop(dmat->lowaddr));
if (dmat->map_count > 0
&& total_bpages < maxpages) {
if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0
|| (dmat->map_count > 0
&& total_bpages < maxpages)) {
int pages;
if (dmat->lowaddr > bounce_lowaddr) {
/*
* Go through the pool and kill any pages
* that don't reside below lowaddr.
*/
panic("bus_dmamap_create: page reallocation "
"not implemented");
}
pages = atop(dmat->maxsize);
pages = MIN(maxpages - total_bpages, pages);
alloc_bounce_pages(dmat, pages);
error = alloc_bounce_pages(dmat, pages);
if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) {
if (error == 0)
dmat->flags |= BUS_DMA_MIN_ALLOC_COMP;
} else {
error = 0;
}
}
} else {
*mapp = NULL;
*mapp = &nobounce_dmamap;
}
if (error == 0)
dmat->map_count++;
@ -283,6 +303,54 @@ bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
return (0);
}
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int
bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp)
{
/* If we succeed, no mapping/bouncing will be required */
*mapp = &nobounce_dmamap;
if ((dmat->maxsize <= PAGE_SIZE) && dmat->lowaddr >= ptoa(Maxmem)) {
*vaddr = malloc(dmat->maxsize, M_DEVBUF,
(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK);
} else {
/*
* XXX Use Contigmalloc until it is merged into this facility
* and handles multi-seg allocations. Nobody is doing
* multi-seg allocations yet though.
*/
*vaddr = contigmalloc(dmat->maxsize, M_DEVBUF,
(flags & BUS_DMA_NOWAIT)
? M_NOWAIT : M_WAITOK,
0ul, dmat->lowaddr, 1ul, dmat->boundary);
}
if (*vaddr == NULL)
return (ENOMEM);
return (0);
}
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void
bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
{
/*
* dmamem does not need to be bounced, so the map should be
* NULL
*/
if (map != NULL)
panic("bus_dmamem_free: Invalid map freed\n");
free(vaddr, M_DEVBUF);
}
#define BUS_DMAMAP_NSEGS ((BUS_SPACE_MAXSIZE / PAGE_SIZE) + 1)
/*
@ -329,9 +397,6 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
}
}
if (map == NULL)
map = &nobounce_dmamap;
/* Reserve Necessary Bounce Pages */
if (map->pagesneeded != 0) {
int s;
@ -361,7 +426,7 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
do {
bus_size_t size;
vm_offset_t nextpaddr;
vm_offset_t nextpaddr; /* GCC warning expected */
paddr = pmap_kextract(vaddr);
size = PAGE_SIZE - (paddr & PAGE_MASK);
@ -393,7 +458,8 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
} while (buflen > 0);
if (buflen != 0) {
printf("bus_dmamap_load: Too many segs!\n");
printf("bus_dmamap_load: Too many segs! buf_len = 0x%x\n",
buflen);
error = EFBIG;
}
@ -479,7 +545,8 @@ alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages)
bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF,
M_NOWAIT, 0ul,
dmat->lowaddr,
PAGE_SIZE, 0x10000);
PAGE_SIZE,
0);
if (bpage->vaddr == NULL) {
free(bpage, M_DEVBUF);
break;

37
sys/amd64/include/bus.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.

37
sys/amd64/include/bus_amd64.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.

37
sys/amd64/include/bus_at386.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.

37
sys/amd64/include/bus_dma.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.

109
sys/i386/i386/busdma_machdep.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: busdma_machdep.c,v 1.4 1998/02/20 13:11:47 bde Exp $
* $Id: busdma_machdep.c,v 1.5 1998/04/17 22:36:26 des Exp $
*/
#include <sys/param.h>
@ -43,13 +43,14 @@
struct bus_dma_tag {
bus_dma_tag_t parent;
bus_size_t alignment;
bus_size_t boundary;
bus_addr_t lowaddr;
bus_addr_t highaddr;
bus_dma_filter_t *filter;
void *filterarg;
bus_size_t maxsize;
int nsegments;
u_int nsegments;
bus_size_t maxsegsz;
int flags;
int ref_count;
@ -114,15 +115,16 @@ run_filter(bus_dma_tag_t dmat, bus_addr_t paddr)
return (retval);
}
#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4
/*
* Allocate a device specific dma_tag.
*/
int
bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filter, void *filterarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat)
bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filter,
void *filterarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat)
{
bus_dma_tag_t newtag;
int error = 0;
@ -155,7 +157,7 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
* XXX Not really correct??? Probably need to honor boundary
* all the way up the inheritence chain.
*/
newtag->boundary = MIN(parent->boundary, newtag->boundary);
newtag->boundary = MAX(parent->boundary, newtag->boundary);
if (newtag->filter == NULL) {
/*
* Short circuit looking at our parent directly
@ -170,7 +172,7 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
}
}
if (newtag->lowaddr < ptoa(Maxmem)) {
if (newtag->lowaddr < ptoa(Maxmem) && (flags & BUS_DMA_ALLOCNOW) != 0) {
/* Must bounce */
if (lowaddr > bounce_lowaddr) {
@ -178,7 +180,7 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
* Go through the pool and kill any pages
* that don't reside below lowaddr.
*/
panic("bus_dmamap_create: page reallocation "
panic("bus_dma_tag_create: page reallocation "
"not implemented");
}
if (ptoa(total_bpages) < maxsize) {
@ -190,6 +192,8 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
if (alloc_bounce_pages(newtag, pages) < pages)
error = ENOMEM;
}
/* Performed initial allocation */
newtag->flags |= BUS_DMA_MIN_ALLOC_COMP;
}
if (error != 0) {
@ -240,7 +244,7 @@ bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
*mapp = (bus_dmamap_t)malloc(sizeof(**mapp), M_DEVBUF,
M_NOWAIT);
if (*mapp == NULL) {
error = ENOMEM;
return (ENOMEM);
} else {
/* Initialize the new map */
bzero(*mapp, sizeof(**mapp));
@ -251,16 +255,32 @@ bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
* basis up to a sane limit.
*/
maxpages = MIN(MAX_BPAGES, Maxmem - atop(dmat->lowaddr));
if (dmat->map_count > 0
&& total_bpages < maxpages) {
if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0
|| (dmat->map_count > 0
&& total_bpages < maxpages)) {
int pages;
if (dmat->lowaddr > bounce_lowaddr) {
/*
* Go through the pool and kill any pages
* that don't reside below lowaddr.
*/
panic("bus_dmamap_create: page reallocation "
"not implemented");
}
pages = atop(dmat->maxsize);
pages = MIN(maxpages - total_bpages, pages);
alloc_bounce_pages(dmat, pages);
error = alloc_bounce_pages(dmat, pages);
if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) {
if (error == 0)
dmat->flags |= BUS_DMA_MIN_ALLOC_COMP;
} else {
error = 0;
}
}
} else {
*mapp = NULL;
*mapp = &nobounce_dmamap;
}
if (error == 0)
dmat->map_count++;
@ -283,6 +303,54 @@ bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
return (0);
}
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int
bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp)
{
/* If we succeed, no mapping/bouncing will be required */
*mapp = &nobounce_dmamap;
if ((dmat->maxsize <= PAGE_SIZE) && dmat->lowaddr >= ptoa(Maxmem)) {
*vaddr = malloc(dmat->maxsize, M_DEVBUF,
(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK);
} else {
/*
* XXX Use Contigmalloc until it is merged into this facility
* and handles multi-seg allocations. Nobody is doing
* multi-seg allocations yet though.
*/
*vaddr = contigmalloc(dmat->maxsize, M_DEVBUF,
(flags & BUS_DMA_NOWAIT)
? M_NOWAIT : M_WAITOK,
0ul, dmat->lowaddr, 1ul, dmat->boundary);
}
if (*vaddr == NULL)
return (ENOMEM);
return (0);
}
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void
bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
{
/*
* dmamem does not need to be bounced, so the map should be
* NULL
*/
if (map != NULL)
panic("bus_dmamem_free: Invalid map freed\n");
free(vaddr, M_DEVBUF);
}
#define BUS_DMAMAP_NSEGS ((BUS_SPACE_MAXSIZE / PAGE_SIZE) + 1)
/*
@ -329,9 +397,6 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
}
}
if (map == NULL)
map = &nobounce_dmamap;
/* Reserve Necessary Bounce Pages */
if (map->pagesneeded != 0) {
int s;
@ -361,7 +426,7 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
do {
bus_size_t size;
vm_offset_t nextpaddr;
vm_offset_t nextpaddr; /* GCC warning expected */
paddr = pmap_kextract(vaddr);
size = PAGE_SIZE - (paddr & PAGE_MASK);
@ -393,7 +458,8 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
} while (buflen > 0);
if (buflen != 0) {
printf("bus_dmamap_load: Too many segs!\n");
printf("bus_dmamap_load: Too many segs! buf_len = 0x%x\n",
buflen);
error = EFBIG;
}
@ -479,7 +545,8 @@ alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages)
bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF,
M_NOWAIT, 0ul,
dmat->lowaddr,
PAGE_SIZE, 0x10000);
PAGE_SIZE,
0);
if (bpage->vaddr == NULL) {
free(bpage, M_DEVBUF);
break;

37
sys/i386/include/bus.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.

37
sys/i386/include/bus_at386.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.

37
sys/i386/include/bus_dma.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.

37
sys/i386/include/bus_pc98.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.

37
sys/sys/bus_dma.h
View File

@ -67,7 +67,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: bus.h,v 1.1 1998/01/15 07:32:54 gibbs Exp $ */
/* $Id: bus.h,v 1.2 1998/04/19 15:28:30 bde Exp $ */
#ifndef _I386_BUS_H_
#define _I386_BUS_H_
@ -93,6 +93,8 @@ typedef u_long bus_size_t;
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR 0xFFFFFFFF
#define BUS_SPACE_UNRESTRICTED (~0)
/*
* Access methods for bus resources and address space.
*/
@ -1196,6 +1198,7 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
@ -1204,25 +1207,25 @@ typedef int bus_dma_filter_t(void *, bus_addr_t);
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t boundary,
bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filtfunc, void *filtfuncarg,
bus_size_t maxsize, int nsegments, bus_size_t maxsegsz,
int flags, bus_dma_tag_t *dmat);
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*
* maxsize: Maximum mapping size supported by this handle.
* nsegments: Number of discontinuities allowed in the map.
* maxsegsz: Maximum size of a segment in the map.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
@ -1232,6 +1235,20 @@ int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.