diff options
Diffstat (limited to 'drivers/cxl/acpi.c')
| -rw-r--r-- | drivers/cxl/acpi.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index 556d25ab6966..5eb9543c587a 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -7,17 +7,58 @@ #include <linux/acpi.h> #include "cxl.h" +static struct acpi_device *to_cxl_host_bridge(struct device *dev) +{ + struct acpi_device *adev = to_acpi_device(dev); + + if (strcmp(acpi_device_hid(adev), "ACPI0016") == 0) + return adev; + return NULL; +} + +static int add_host_bridge_dport(struct device *match, void *arg) +{ + int rc; + acpi_status status; + unsigned long long uid; + struct cxl_port *root_port = arg; + struct device *host = root_port->dev.parent; + struct acpi_device *bridge = to_cxl_host_bridge(match); + + if (!bridge) + return 0; + + status = acpi_evaluate_integer(bridge->handle, METHOD_NAME__UID, NULL, + &uid); + if (status != AE_OK) { + dev_err(host, "unable to retrieve _UID of %s\n", + dev_name(match)); + return -ENODEV; + } + + rc = cxl_add_dport(root_port, match, uid, CXL_RESOURCE_NONE); + if (rc) { + dev_err(host, "failed to add downstream port: %s\n", + dev_name(match)); + return rc; + } + dev_dbg(host, "add dport%llu: %s\n", uid, dev_name(match)); + return 0; +} + static int cxl_acpi_probe(struct platform_device *pdev) { struct cxl_port *root_port; struct device *host = &pdev->dev; + struct acpi_device *adev = ACPI_COMPANION(host); root_port = devm_cxl_add_port(host, host, CXL_RESOURCE_NONE, NULL); if (IS_ERR(root_port)) return PTR_ERR(root_port); dev_dbg(host, "add: %s\n", dev_name(&root_port->dev)); - return 0; + return bus_for_each_dev(adev->dev.bus, NULL, root_port, + add_host_bridge_dport); } static const struct acpi_device_id cxl_acpi_ids[] = { |