diff options
| -rw-r--r-- | drivers/cxl/core/port.c | 7 | ||||
| -rw-r--r-- | drivers/cxl/cxlmem.h | 2 | ||||
| -rw-r--r-- | drivers/cxl/mem.c | 33 | ||||
| -rw-r--r-- | drivers/cxl/pci.c | 10 |
4 files changed, 44 insertions, 8 deletions
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 4982b6902ef5..50bdbd9f8da3 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -1369,6 +1369,13 @@ int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd) struct device *iter; int rc; + /* + * Skip intermediate port enumeration in the RCH case, there + * are no ports in between a host bridge and an endpoint. + */ + if (cxlmd->cxlds->rcd) + return 0; + rc = devm_add_action_or_reset(&cxlmd->dev, cxl_detach_ep, cxlmd); if (rc) return rc; diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index e082991bc58c..35d485d041f0 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -201,6 +201,7 @@ struct cxl_endpoint_dvsec_info { * @dev: The device associated with this CXL state * @regs: Parsed register blocks * @cxl_dvsec: Offset to the PCIe device DVSEC + * @rcd: operating in RCD mode (CXL 3.0 9.11.8 CXL Devices Attached to an RCH) * @payload_size: Size of space for payload * (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register) * @lsa_size: Size of Label Storage Area @@ -235,6 +236,7 @@ struct cxl_dev_state { struct cxl_regs regs; int cxl_dvsec; + bool rcd; size_t payload_size; size_t lsa_size; struct mutex mbox_mutex; /* Protects device mailbox and firmware */ diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index aa63ce8c7ca6..39c4b54f0715 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -45,12 +45,13 @@ static int cxl_mem_dpa_show(struct seq_file *file, void *data) return 0; } -static int devm_cxl_add_endpoint(struct cxl_memdev *cxlmd, +static int devm_cxl_add_endpoint(struct device *host, struct cxl_memdev *cxlmd, struct cxl_dport *parent_dport) { struct cxl_port *parent_port = parent_dport->port; struct cxl_dev_state *cxlds = cxlmd->cxlds; struct cxl_port *endpoint, *iter, *down; + resource_size_t component_reg_phys; int rc; /* @@ -65,8 +66,18 @@ static int devm_cxl_add_endpoint(struct cxl_memdev *cxlmd, ep->next = down; } - endpoint = devm_cxl_add_port(&parent_port->dev, &cxlmd->dev, - cxlds->component_reg_phys, parent_dport); + /* + * The component registers for an RCD might come from the + * host-bridge RCRB if they are not already mapped via the + * typical register locator mechanism. + */ + if (parent_dport->rch && cxlds->component_reg_phys == CXL_RESOURCE_NONE) + component_reg_phys = cxl_rcrb_to_component( + &cxlmd->dev, parent_dport->rcrb, CXL_RCRB_UPSTREAM); + else + component_reg_phys = cxlds->component_reg_phys; + endpoint = devm_cxl_add_port(host, &cxlmd->dev, component_reg_phys, + parent_dport); if (IS_ERR(endpoint)) return PTR_ERR(endpoint); @@ -87,6 +98,7 @@ static int cxl_mem_probe(struct device *dev) { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct device *endpoint_parent; struct cxl_port *parent_port; struct cxl_dport *dport; struct dentry *dentry; @@ -119,17 +131,22 @@ static int cxl_mem_probe(struct device *dev) return -ENXIO; } - device_lock(&parent_port->dev); - if (!parent_port->dev.driver) { + if (dport->rch) + endpoint_parent = parent_port->uport; + else + endpoint_parent = &parent_port->dev; + + device_lock(endpoint_parent); + if (!endpoint_parent->driver) { dev_err(dev, "CXL port topology %s not enabled\n", - dev_name(&parent_port->dev)); + dev_name(endpoint_parent)); rc = -ENXIO; goto unlock; } - rc = devm_cxl_add_endpoint(cxlmd, dport); + rc = devm_cxl_add_endpoint(endpoint_parent, cxlmd, dport); unlock: - device_unlock(&parent_port->dev); + device_unlock(endpoint_parent); put_device(&parent_port->dev); if (rc) return rc; diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index e15da405b948..73ff6c33a0c0 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -433,6 +433,15 @@ static void devm_cxl_pci_create_doe(struct cxl_dev_state *cxlds) } } +/* + * Assume that any RCIEP that emits the CXL memory expander class code + * is an RCD + */ +static bool is_cxl_restricted(struct pci_dev *pdev) +{ + return pci_pcie_type(pdev) == PCI_EXP_TYPE_RC_END; +} + static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct cxl_register_map map; @@ -455,6 +464,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (IS_ERR(cxlds)) return PTR_ERR(cxlds); + cxlds->rcd = is_cxl_restricted(pdev); cxlds->serial = pci_get_dsn(pdev); cxlds->cxl_dvsec = pci_find_dvsec_capability( pdev, PCI_DVSEC_VENDOR_ID_CXL, CXL_DVSEC_PCIE_DEVICE); |