diff options
Diffstat (limited to 'share/man/man9/bus_dma.9')
| -rw-r--r-- | share/man/man9/bus_dma.9 | 32 |
1 files changed, 12 insertions, 20 deletions
diff --git a/share/man/man9/bus_dma.9 b/share/man/man9/bus_dma.9 index 832ddb4daa22..b644eeb2a476 100644 --- a/share/man/man9/bus_dma.9 +++ b/share/man/man9/bus_dma.9 @@ -373,7 +373,7 @@ inclusive. The filter function should return zero if any mapping in this range can be accommodated by the device and non-zero otherwise. .Pp -.Em Note: The use of filters is deprecated. Proper operation is not guaranteed. +.Em Note: The use of filters is no longer supported and will result in an error. .It Vt bus_dma_segment_t A machine-dependent type that describes individual DMA segments. @@ -611,26 +611,10 @@ This area of is used to bounce requests that would otherwise conflict with the exclusion window. .It Fa filtfunc -Optional filter function (may be -.Dv NULL ) -to be called for any attempt to -map memory into the window described by -.Fa lowaddr -and -.Fa highaddr . -A filter function is only required when the single window described -by -.Fa lowaddr -and -.Fa highaddr -cannot adequately describe the constraints of the device. -The filter function will be called for every machine page -that overlaps the exclusion window. -.Pp -.Em Note: The use of filters is deprecated. Proper operation is not guaranteed. +Formerly the optional filter function; must be +.Dv NULL . .It Fa filtfuncarg -Argument passed to all calls to the filter function for this tag. -May be +Must be .Dv NULL . .It Fa maxsize Maximum size, in bytes, of the sum of all segment lengths in a given @@ -689,6 +673,14 @@ Returns .Er ENOMEM if sufficient memory is not available for tag creation or allocating mapping resources. +Returns +.Er EINVAL +if either +.Fa filtfunc +or +.Fa filtarg +arguments are not +.Dv NULL . .It Fn bus_dma_tag_destroy "dmat" Deallocate the DMA tag .Fa dmat |