From: Alejandro Lucero A CXL region struct contains the physical address to work with. Type2 drivers can create a CXL region but have not access to the related struct as it is defined as private by the kernel CXL core. Add a function for getting the cxl region range to be used for mapping such memory range by a Type2 driver. Signed-off-by: Alejandro Lucero Reviewed-by: Zhi Wang Reviewed-by: Jonathan Cameron Reviewed-by: Dave Jiang --- drivers/cxl/core/region.c | 23 +++++++++++++++++++++++ include/cxl/cxl.h | 2 ++ 2 files changed, 25 insertions(+) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index e39f272dd445..97b2fb68e029 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2758,6 +2758,29 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd, return ERR_PTR(rc); } +/** + * cxl_get_region_range - obtain range linked to a CXL region + * + * @region: a pointer to struct cxl_region + * @range: a pointer to a struct range to be set + * + * Returns 0 or error. + */ +int cxl_get_region_range(struct cxl_region *region, struct range *range) +{ + if (WARN_ON_ONCE(!region)) + return -ENODEV; + + if (!region->params.res) + return -ENOSPC; + + range->start = region->params.res->start; + range->end = region->params.res->end; + + return 0; +} +EXPORT_SYMBOL_NS_GPL(cxl_get_region_range, "CXL"); + static ssize_t __create_region_show(struct cxl_root_decoder *cxlrd, char *buf) { return sysfs_emit(buf, "region%u\n", atomic_read(&cxlrd->region_id)); diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index e82f94921b5b..673a0aeec086 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -290,4 +290,6 @@ enum cxl_detach_mode { int cxl_decoder_detach(struct cxl_region *cxlr, struct cxl_endpoint_decoder *cxled, int pos, enum cxl_detach_mode mode); +struct range; +int cxl_get_region_range(struct cxl_region *region, struct range *range); #endif /* __CXL_CXL_H__ */ -- 2.34.1