diff options
Diffstat (limited to 'drivers/cxl/core/region.c')
| -rw-r--r-- | drivers/cxl/core/region.c | 39 |
1 files changed, 25 insertions, 14 deletions
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 70d0a017e99c..b98b1ccffd1c 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -1295,6 +1295,7 @@ static int cxl_port_setup_targets(struct cxl_port *port, struct cxl_region_params *p = &cxlr->params; struct cxl_decoder *cxld = cxl_rr->decoder; struct cxl_switch_decoder *cxlsd; + struct cxl_port *iter = port; u16 eig, peig; u8 eiw, peiw; @@ -1311,16 +1312,26 @@ static int cxl_port_setup_targets(struct cxl_port *port, cxlsd = to_cxl_switch_decoder(&cxld->dev); if (cxl_rr->nr_targets_set) { - int i, distance; + int i, distance = 1; + struct cxl_region_ref *cxl_rr_iter; /* - * Passthrough decoders impose no distance requirements between - * peers + * The "distance" between peer downstream ports represents which + * endpoint positions in the region interleave a given port can + * host. + * + * For example, at the root of a hierarchy the distance is + * always 1 as every index targets a different host-bridge. At + * each subsequent switch level those ports map every Nth region + * position where N is the width of the switch == distance. */ - if (cxl_rr->nr_targets == 1) - distance = 0; - else - distance = p->nr_targets / cxl_rr->nr_targets; + do { + cxl_rr_iter = cxl_rr_load(iter, cxlr); + distance *= cxl_rr_iter->nr_targets; + iter = to_cxl_port(iter->dev.parent); + } while (!is_cxl_root(iter)); + distance *= cxlrd->cxlsd.cxld.interleave_ways; + for (i = 0; i < cxl_rr->nr_targets_set; i++) if (ep->dport == cxlsd->target[i]) { rc = check_last_peer(cxled, ep, cxl_rr, @@ -2299,7 +2310,7 @@ bool is_cxl_region(struct device *dev) { return dev->type == &cxl_region_type; } -EXPORT_SYMBOL_NS_GPL(is_cxl_region, CXL); +EXPORT_SYMBOL_NS_GPL(is_cxl_region, "CXL"); static struct cxl_region *to_cxl_region(struct device *dev) { @@ -2652,7 +2663,7 @@ bool is_cxl_pmem_region(struct device *dev) { return dev->type == &cxl_pmem_region_type; } -EXPORT_SYMBOL_NS_GPL(is_cxl_pmem_region, CXL); +EXPORT_SYMBOL_NS_GPL(is_cxl_pmem_region, "CXL"); struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev) { @@ -2661,7 +2672,7 @@ struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev) return NULL; return container_of(dev, struct cxl_pmem_region, dev); } -EXPORT_SYMBOL_NS_GPL(to_cxl_pmem_region, CXL); +EXPORT_SYMBOL_NS_GPL(to_cxl_pmem_region, "CXL"); struct cxl_poison_context { struct cxl_port *port; @@ -3015,7 +3026,7 @@ struct cxl_dax_region *to_cxl_dax_region(struct device *dev) return NULL; return container_of(dev, struct cxl_dax_region, dev); } -EXPORT_SYMBOL_NS_GPL(to_cxl_dax_region, CXL); +EXPORT_SYMBOL_NS_GPL(to_cxl_dax_region, "CXL"); static struct lock_class_key cxl_dax_region_key; @@ -3359,7 +3370,7 @@ out: put_device(cxlrd_dev); return rc; } -EXPORT_SYMBOL_NS_GPL(cxl_add_to_region, CXL); +EXPORT_SYMBOL_NS_GPL(cxl_add_to_region, "CXL"); static int is_system_ram(struct resource *res, void *arg) { @@ -3462,6 +3473,6 @@ void cxl_region_exit(void) cxl_driver_unregister(&cxl_region_driver); } -MODULE_IMPORT_NS(CXL); -MODULE_IMPORT_NS(DEVMEM); +MODULE_IMPORT_NS("CXL"); +MODULE_IMPORT_NS("DEVMEM"); MODULE_ALIAS_CXL(CXL_DEVICE_REGION); |