Having a way to figure out the region index (or bar) associated with a memory region is helpful in various scenarios. For example, this capability can be useful in retrieving the region info needed for mapping a part of a VFIO region or creating a dmabuf.
Cc: Alex Williamson <[email protected]> Cc: Cédric Le Goater <[email protected]> Signed-off-by: Vivek Kasireddy <[email protected]> --- hw/vfio/region.c | 14 ++++++++++++++ include/hw/vfio/vfio-device.h | 10 ++++++++++ 2 files changed, 24 insertions(+) diff --git a/hw/vfio/region.c b/hw/vfio/region.c index b165ab0b93..046adfaa2c 100644 --- a/hw/vfio/region.c +++ b/hw/vfio/region.c @@ -398,3 +398,17 @@ void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), enabled); } + +int vfio_get_region_index_from_mr(MemoryRegion *mr) +{ + VFIORegion *region; + + while (mr->container) { + if (mr->ops == &vfio_region_ops) { + region = mr->opaque; + return region->nr; + } + mr = mr->container; + } + return -1; +} diff --git a/include/hw/vfio/vfio-device.h b/include/hw/vfio/vfio-device.h index bb28123faf..44cacd3728 100644 --- a/include/hw/vfio/vfio-device.h +++ b/include/hw/vfio/vfio-device.h @@ -290,6 +290,16 @@ bool vfio_device_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_t int vfio_device_get_irq_info(VFIODevice *vbasedev, int index, struct vfio_irq_info *info); + +/** + * Return the region index associated with a given MemoryRegion. The index + * can be useful in retrieving region info. + * + * @mr: MemoryRegion to use + * + * Returns the region index or -1 on error. + */ +int vfio_get_region_index_from_mr(MemoryRegion *mr); #endif /* Returns 0 on success, or a negative errno. */ -- 2.50.1
