diff options
Diffstat (limited to 'drivers/cxl/core/region.c')
-rw-r--r-- | drivers/cxl/core/region.c | 168 |
1 files changed, 103 insertions, 65 deletions
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index f822de44bee0..e115ba382e04 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -125,10 +125,38 @@ static struct cxl_region_ref *cxl_rr_load(struct cxl_port *port, return xa_load(&port->regions, (unsigned long)cxlr); } +static int cxl_region_invalidate_memregion(struct cxl_region *cxlr) +{ + if (!cpu_cache_has_invalidate_memregion()) { + if (IS_ENABLED(CONFIG_CXL_REGION_INVALIDATION_TEST)) { + dev_warn_once( + &cxlr->dev, + "Bypassing cpu_cache_invalidate_memregion() for testing!\n"); + return 0; + } else { + dev_err(&cxlr->dev, + "Failed to synchronize CPU cache state\n"); + return -ENXIO; + } + } + + cpu_cache_invalidate_memregion(IORES_DESC_CXL); + return 0; +} + static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) { struct cxl_region_params *p = &cxlr->params; - int i; + int i, rc = 0; + + /* + * Before region teardown attempt to flush, and if the flush + * fails cancel the region teardown for data consistency + * concerns + */ + rc = cxl_region_invalidate_memregion(cxlr); + if (rc) + return rc; for (i = count - 1; i >= 0; i--) { struct cxl_endpoint_decoder *cxled = p->targets[i]; @@ -136,7 +164,6 @@ static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) struct cxl_port *iter = cxled_to_port(cxled); struct cxl_dev_state *cxlds = cxlmd->cxlds; struct cxl_ep *ep; - int rc = 0; if (cxlds->rcd) goto endpoint_reset; @@ -155,14 +182,19 @@ static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) rc = cxld->reset(cxld); if (rc) return rc; + set_bit(CXL_REGION_F_NEEDS_RESET, &cxlr->flags); } endpoint_reset: rc = cxled->cxld.reset(&cxled->cxld); if (rc) return rc; + set_bit(CXL_REGION_F_NEEDS_RESET, &cxlr->flags); } + /* all decoders associated with this region have been torn down */ + clear_bit(CXL_REGION_F_NEEDS_RESET, &cxlr->flags); + return 0; } @@ -256,9 +288,19 @@ static ssize_t commit_store(struct device *dev, struct device_attribute *attr, goto out; } - if (commit) + /* + * Invalidate caches before region setup to drop any speculative + * consumption of this address space + */ + rc = cxl_region_invalidate_memregion(cxlr); + if (rc) + return rc; + + if (commit) { rc = cxl_region_decode_commit(cxlr); - else { + if (rc == 0) + p->state = CXL_CONFIG_COMMIT; + } else { p->state = CXL_CONFIG_RESET_PENDING; up_write(&cxl_region_rwsem); device_release_driver(&cxlr->dev); @@ -268,18 +310,20 @@ static ssize_t commit_store(struct device *dev, struct device_attribute *attr, * The lock was dropped, so need to revalidate that the reset is * still pending. */ - if (p->state == CXL_CONFIG_RESET_PENDING) + if (p->state == CXL_CONFIG_RESET_PENDING) { rc = cxl_region_decode_reset(cxlr, p->interleave_ways); + /* + * Revert to committed since there may still be active + * decoders associated with this region, or move forward + * to active to mark the reset successful + */ + if (rc) + p->state = CXL_CONFIG_COMMIT; + else + p->state = CXL_CONFIG_ACTIVE; + } } - if (rc) - goto out; - - if (commit) - p->state = CXL_CONFIG_COMMIT; - else if (p->state == CXL_CONFIG_RESET_PENDING) - p->state = CXL_CONFIG_ACTIVE; - out: up_write(&cxl_region_rwsem); @@ -809,6 +853,18 @@ static int cxl_rr_alloc_decoder(struct cxl_port *port, struct cxl_region *cxlr, return -EBUSY; } + /* + * Endpoints should already match the region type, but backstop that + * assumption with an assertion. Switch-decoders change mapping-type + * based on what is mapped when they are assigned to a region. + */ + dev_WARN_ONCE(&cxlr->dev, + port == cxled_to_port(cxled) && + cxld->target_type != cxlr->type, + "%s:%s mismatch decoder type %d -> %d\n", + dev_name(&cxled_to_memdev(cxled)->dev), + dev_name(&cxld->dev), cxld->target_type, cxlr->type); + cxld->target_type = cxlr->type; cxl_rr->decoder = cxld; return 0; } @@ -906,10 +962,10 @@ static int cxl_port_attach_region(struct cxl_port *port, dev_dbg(&cxlr->dev, "%s:%s %s add: %s:%s @ %d next: %s nr_eps: %d nr_targets: %d\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), dev_name(&cxld->dev), dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), pos, - ep ? ep->next ? dev_name(ep->next->uport) : + ep ? ep->next ? dev_name(ep->next->uport_dev) : dev_name(&cxlmd->dev) : "none", cxl_rr->nr_eps, cxl_rr->nr_targets); @@ -984,7 +1040,7 @@ static int check_last_peer(struct cxl_endpoint_decoder *cxled, */ if (pos < distance) { dev_dbg(&cxlr->dev, "%s:%s: cannot host %s:%s at %d\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), pos); return -ENXIO; } @@ -994,7 +1050,7 @@ static int check_last_peer(struct cxl_endpoint_decoder *cxled, if (ep->dport != ep_peer->dport) { dev_dbg(&cxlr->dev, "%s:%s: %s:%s pos %d mismatched peer %s:%s\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), pos, dev_name(&cxlmd_peer->dev), dev_name(&cxled_peer->cxld.dev)); @@ -1026,7 +1082,7 @@ static int cxl_port_setup_targets(struct cxl_port *port, */ if (!is_power_of_2(cxl_rr->nr_targets)) { dev_dbg(&cxlr->dev, "%s:%s: invalid target count %d\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), cxl_rr->nr_targets); return -EINVAL; } @@ -1076,7 +1132,7 @@ static int cxl_port_setup_targets(struct cxl_port *port, rc = granularity_to_eig(parent_ig, &peig); if (rc) { dev_dbg(&cxlr->dev, "%s:%s: invalid parent granularity: %d\n", - dev_name(parent_port->uport), + dev_name(parent_port->uport_dev), dev_name(&parent_port->dev), parent_ig); return rc; } @@ -1084,7 +1140,7 @@ static int cxl_port_setup_targets(struct cxl_port *port, rc = ways_to_eiw(parent_iw, &peiw); if (rc) { dev_dbg(&cxlr->dev, "%s:%s: invalid parent interleave: %d\n", - dev_name(parent_port->uport), + dev_name(parent_port->uport_dev), dev_name(&parent_port->dev), parent_iw); return rc; } @@ -1093,7 +1149,7 @@ static int cxl_port_setup_targets(struct cxl_port *port, rc = ways_to_eiw(iw, &eiw); if (rc) { dev_dbg(&cxlr->dev, "%s:%s: invalid port interleave: %d\n", - dev_name(port->uport), dev_name(&port->dev), iw); + dev_name(port->uport_dev), dev_name(&port->dev), iw); return rc; } @@ -1113,7 +1169,7 @@ static int cxl_port_setup_targets(struct cxl_port *port, rc = eig_to_granularity(eig, &ig); if (rc) { dev_dbg(&cxlr->dev, "%s:%s: invalid interleave: %d\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), 256 << eig); return rc; } @@ -1126,11 +1182,11 @@ static int cxl_port_setup_targets(struct cxl_port *port, ((cxld->flags & CXL_DECODER_F_ENABLE) == 0)) { dev_err(&cxlr->dev, "%s:%s %s expected iw: %d ig: %d %pr\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), __func__, iw, ig, p->res); dev_err(&cxlr->dev, "%s:%s %s got iw: %d ig: %d state: %s %#llx:%#llx\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), __func__, cxld->interleave_ways, cxld->interleave_granularity, (cxld->flags & CXL_DECODER_F_ENABLE) ? @@ -1147,22 +1203,22 @@ static int cxl_port_setup_targets(struct cxl_port *port, .end = p->res->end, }; } - dev_dbg(&cxlr->dev, "%s:%s iw: %d ig: %d\n", dev_name(port->uport), + dev_dbg(&cxlr->dev, "%s:%s iw: %d ig: %d\n", dev_name(port->uport_dev), dev_name(&port->dev), iw, ig); add_target: if (cxl_rr->nr_targets_set == cxl_rr->nr_targets) { dev_dbg(&cxlr->dev, "%s:%s: targets full trying to add %s:%s at %d\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), pos); return -ENXIO; } if (test_bit(CXL_REGION_F_AUTO, &cxlr->flags)) { if (cxlsd->target[cxl_rr->nr_targets_set] != ep->dport) { dev_dbg(&cxlr->dev, "%s:%s: %s expected %s at %d\n", - dev_name(port->uport), dev_name(&port->dev), + dev_name(port->uport_dev), dev_name(&port->dev), dev_name(&cxlsd->cxld.dev), - dev_name(ep->dport->dport), + dev_name(ep->dport->dport_dev), cxl_rr->nr_targets_set); return -ENXIO; } @@ -1172,8 +1228,8 @@ add_target: out_target_set: cxl_rr->nr_targets_set += inc; dev_dbg(&cxlr->dev, "%s:%s target[%d] = %s for %s:%s @ %d\n", - dev_name(port->uport), dev_name(&port->dev), - cxl_rr->nr_targets_set - 1, dev_name(ep->dport->dport), + dev_name(port->uport_dev), dev_name(&port->dev), + cxl_rr->nr_targets_set - 1, dev_name(ep->dport->dport_dev), dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), pos); return 0; @@ -1492,7 +1548,7 @@ static int cmp_decode_pos(const void *a, const void *b) if (!dev) { struct range *range = &cxled_a->cxld.hpa_range; - dev_err(port->uport, + dev_err(port->uport_dev, "failed to find decoder that maps %#llx-%#llx\n", range->start, range->end); goto err; @@ -1507,14 +1563,15 @@ static int cmp_decode_pos(const void *a, const void *b) put_device(dev); if (a_pos < 0 || b_pos < 0) { - dev_err(port->uport, + dev_err(port->uport_dev, "failed to find shared decoder for %s and %s\n", dev_name(cxlmd_a->dev.parent), dev_name(cxlmd_b->dev.parent)); goto err; } - dev_dbg(port->uport, "%s comes %s %s\n", dev_name(cxlmd_a->dev.parent), + dev_dbg(port->uport_dev, "%s comes %s %s\n", + dev_name(cxlmd_a->dev.parent), a_pos - b_pos < 0 ? "before" : "after", dev_name(cxlmd_b->dev.parent)); @@ -1674,7 +1731,6 @@ static int cxl_region_attach(struct cxl_region *cxlr, if (rc) goto err_decrement; p->state = CXL_CONFIG_ACTIVE; - set_bit(CXL_REGION_F_INCOHERENT, &cxlr->flags); } cxled->cxld.interleave_ways = p->interleave_ways; @@ -2059,11 +2115,11 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd, if (rc) goto err; - rc = devm_add_action_or_reset(port->uport, unregister_region, cxlr); + rc = devm_add_action_or_reset(port->uport_dev, unregister_region, cxlr); if (rc) return ERR_PTR(rc); - dev_dbg(port->uport, "%s: created %s\n", + dev_dbg(port->uport_dev, "%s: created %s\n", dev_name(&cxlrd->cxlsd.cxld.dev), dev_name(dev)); return cxlr; @@ -2103,7 +2159,7 @@ static struct cxl_region *__create_region(struct cxl_root_decoder *cxlrd, return ERR_PTR(-EBUSY); } - return devm_cxl_add_region(cxlrd, id, mode, CXL_DECODER_EXPANDER); + return devm_cxl_add_region(cxlrd, id, mode, CXL_DECODER_HOSTONLYMEM); } static ssize_t create_pmem_region_store(struct device *dev, @@ -2191,7 +2247,7 @@ static ssize_t delete_region_store(struct device *dev, if (IS_ERR(cxlr)) return PTR_ERR(cxlr); - devm_release_action(port->uport, unregister_region, cxlr); + devm_release_action(port->uport_dev, unregister_region, cxlr); put_device(&cxlr->dev); return len; @@ -2356,7 +2412,8 @@ int cxl_get_poison_by_endpoint(struct cxl_port *port) rc = device_for_each_child(&port->dev, &ctx, poison_by_decoder); if (rc == 1) - rc = cxl_get_poison_unmapped(to_cxl_memdev(port->uport), &ctx); + rc = cxl_get_poison_unmapped(to_cxl_memdev(port->uport_dev), + &ctx); up_read(&cxl_region_rwsem); return rc; @@ -2732,7 +2789,7 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, err: up_write(&cxl_region_rwsem); - devm_release_action(port->uport, unregister_region, cxlr); + devm_release_action(port->uport_dev, unregister_region, cxlr); return ERR_PTR(rc); } @@ -2803,30 +2860,6 @@ out: } EXPORT_SYMBOL_NS_GPL(cxl_add_to_region, CXL); -static int cxl_region_invalidate_memregion(struct cxl_region *cxlr) -{ - if (!test_bit(CXL_REGION_F_INCOHERENT, &cxlr->flags)) - return 0; - - if (!cpu_cache_has_invalidate_memregion()) { - if (IS_ENABLED(CONFIG_CXL_REGION_INVALIDATION_TEST)) { - dev_warn_once( - &cxlr->dev, - "Bypassing cpu_cache_invalidate_memregion() for testing!\n"); - clear_bit(CXL_REGION_F_INCOHERENT, &cxlr->flags); - return 0; - } else { - dev_err(&cxlr->dev, - "Failed to synchronize CPU cache state\n"); - return -ENXIO; - } - } - - cpu_cache_invalidate_memregion(IORES_DESC_CXL); - clear_bit(CXL_REGION_F_INCOHERENT, &cxlr->flags); - return 0; -} - static int is_system_ram(struct resource *res, void *arg) { struct cxl_region *cxlr = arg; @@ -2854,7 +2887,12 @@ static int cxl_region_probe(struct device *dev) goto out; } - rc = cxl_region_invalidate_memregion(cxlr); + if (test_bit(CXL_REGION_F_NEEDS_RESET, &cxlr->flags)) { + dev_err(&cxlr->dev, + "failed to activate, re-commit region and retry\n"); + rc = -ENXIO; + goto out; + } /* * From this point on any path that changes the region's state away from |