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arm64: Implement busdma bits for KMSAN

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This works identically to amd64.  In particular, only the
bus_dma_bounce_impl busdma implementation handles KMSAN at the moment.

MFC after:	2 weeks
Sponsored by:	Klara, Inc.
Sponsored by:	Juniper Networks, Inc.
Differential Revision:	https://reviews.freebsd.org/D43157
This commit is contained in:
Mark Johnston 2024-02-08 11:01:55 -05:00
parent 90010126b0
commit 5fa4151e92
3 changed files with 36 additions and 2 deletions
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23
sys/arm64/arm64/busdma_bounce.c
View File

@ -40,9 +40,10 @@
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/proc.h>
#include <sys/memdesc.h>
#include <sys/msan.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
@ -104,6 +105,9 @@ struct bus_dmamap {
#define DMAMAP_FROM_DMAMEM (1 << 1)
#define DMAMAP_MBUF (1 << 2)
int sync_count;
#ifdef KMSAN
struct memdesc kmsan_mem;
#endif
struct sync_list slist[];
};
@ -1149,8 +1153,20 @@ bounce_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map,
*/
dsb(sy);
}
kmsan_bus_dmamap_sync(&map->kmsan_mem, op);
}
#ifdef KMSAN
static void
bounce_bus_dmamap_load_kmsan(bus_dmamap_t map, struct memdesc *mem)
{
if (map == NULL)
return;
memcpy(&map->kmsan_mem, mem, sizeof(map->kmsan_mem));
}
#endif
struct bus_dma_impl bus_dma_bounce_impl = {
.tag_create = bounce_bus_dma_tag_create,
.tag_destroy = bounce_bus_dma_tag_destroy,
@ -1166,5 +1182,8 @@ struct bus_dma_impl bus_dma_bounce_impl = {
.map_waitok = bounce_bus_dmamap_waitok,
.map_complete = bounce_bus_dmamap_complete,
.map_unload = bounce_bus_dmamap_unload,
.map_sync = bounce_bus_dmamap_sync
.map_sync = bounce_bus_dmamap_sync,
#ifdef KMSAN
.load_kmsan = bounce_bus_dmamap_load_kmsan,
#endif
};

12
sys/arm64/include/bus_dma.h
View File

@ -149,4 +149,16 @@ _bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map,
return (tc->impl->map_complete(dmat, map, segs, nsegs, error));
}
#ifdef KMSAN
static inline void
_bus_dmamap_load_kmsan(bus_dma_tag_t dmat, bus_dmamap_t map,
struct memdesc *mem)
{
struct bus_dma_tag_common *tc;
tc = (struct bus_dma_tag_common *)dmat;
return (tc->impl->load_kmsan(map, mem));
}
#endif
#endif /* !_MACHINE_BUS_DMA_H_ */

3
sys/arm64/include/bus_dma_impl.h
View File

@ -75,6 +75,9 @@ struct bus_dma_impl {
void (*map_unload)(bus_dma_tag_t dmat, bus_dmamap_t map);
void (*map_sync)(bus_dma_tag_t dmat, bus_dmamap_t map,
bus_dmasync_op_t op);
#ifdef KMSAN
void (*load_kmsan)(bus_dmamap_t map, struct memdesc *mem);
#endif
};
int common_bus_dma_tag_create(struct bus_dma_tag_common *parent,