busdma: _bus_dmamap_addseg repaired

A recent change introduced a one-off error into a test allowing
coalescing chunks into segments.  This fixes that error.

broke a check in _bus_dmamap_addseg on many architectures. This change makes it clear that it is not a particular range that is being boundary-checked, but the proposed union of the two adjacent ranges.
Reported by:	se
Reviewed by:	se
Fixes:	c606ab59e7 vm_extern: use standard address checkers everywhere
Differential Revision:	https://reviews.freebsd.org/D33715

sys/arm/arm/busdma_machdep.c

@@ -1027,8 +1027,8 @@ _bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t curaddr,
 	} else {
 		if (curaddr == segs[seg].ds_addr + segs[seg].ds_len &&
 		    (segs[seg].ds_len + sgsize) <= dmat->maxsegsz &&
-		    vm_addr_bound_ok(segs[seg].ds_addr, segs[seg].ds_len,
-		    dmat->boundary))
+		    vm_addr_bound_ok(segs[seg].ds_addr,
+		    segs[seg].ds_len + sgsize, dmat->boundary))
 			segs[seg].ds_len += sgsize;
 		else {
 			if (++seg >= dmat->nsegments)

sys/arm64/arm64/busdma_bounce.c

@@ -787,8 +787,8 @@ _bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t curaddr,
 	} else {
 		if (curaddr == segs[seg].ds_addr + segs[seg].ds_len &&
 		    (segs[seg].ds_len + sgsize) <= dmat->common.maxsegsz &&
-		    vm_addr_bound_ok(segs[seg].ds_addr, segs[seg].ds_len,
-		    dmat->common.boundary))
+		    vm_addr_bound_ok(segs[seg].ds_addr,
+		    segs[seg].ds_len + sgsize, dmat->common.boundary))
 			segs[seg].ds_len += sgsize;
 		else {
 			if (++seg >= dmat->common.nsegments)

sys/powerpc/powerpc/busdma_machdep.c

@@ -708,8 +708,8 @@ _bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t curaddr,
 	} else {
 		if (curaddr == segs[seg].ds_addr + segs[seg].ds_len &&
 		    (segs[seg].ds_len + sgsize) <= dmat->maxsegsz &&
-		    vm_addr_bound_ok(segs[seg].ds_addr, segs[seg].ds_len,
-		    dmat->boundary))
+		    vm_addr_bound_ok(segs[seg].ds_addr,
+		    segs[seg].ds_len + sgsize, dmat->boundary))
 			segs[seg].ds_len += sgsize;
 		else {
 			if (++seg >= dmat->nsegments)

sys/riscv/riscv/busdma_bounce.c

@@ -656,8 +656,8 @@ _bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t curaddr,
 	} else {
 		if (curaddr == segs[seg].ds_addr + segs[seg].ds_len &&
 		    (segs[seg].ds_len + sgsize) <= dmat->common.maxsegsz &&
-		    vm_addr_bound_ok(segs[seg].ds_addr, segs[seg].ds_len,
-		    dmat->common.boundary))
+		    vm_addr_bound_ok(segs[seg].ds_addr,
+		    segs[seg].ds_len + sgsize, dmat->common.boundary))
 			segs[seg].ds_len += sgsize;
 		else {
 			if (++seg >= dmat->common.nsegments)

sys/x86/x86/busdma_bounce.c

@@ -718,8 +718,8 @@ _bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t curaddr,
 	} else {
 		if (curaddr == segs[seg].ds_addr + segs[seg].ds_len &&
 		    (segs[seg].ds_len + sgsize) <= dmat->common.maxsegsz &&
-		    vm_addr_bound_ok(segs[seg].ds_addr, segs[seg].ds_len,
-		    dmat->common.boundary))
+		    vm_addr_bound_ok(segs[seg].ds_addr,
+		    segs[seg].ds_len + sgsize, dmat->common.boundary))
 			segs[seg].ds_len += sgsize;
 		else {
 			if (++seg >= dmat->common.nsegments)