diff options
Diffstat (limited to 'drivers/cxl/core/port.c')
| -rw-r--r-- | drivers/cxl/core/port.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index fc5d86222bc3..2a4230d685d5 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -25,6 +25,7 @@ */ static DEFINE_IDA(cxl_port_ida); +static DEFINE_XARRAY(cxl_root_buses); static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -418,6 +419,42 @@ err: } EXPORT_SYMBOL_NS_GPL(devm_cxl_add_port, CXL); +struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port) +{ + /* There is no pci_bus associated with a CXL platform-root port */ + if (is_cxl_root(port)) + return NULL; + + if (dev_is_pci(port->uport)) { + struct pci_dev *pdev = to_pci_dev(port->uport); + + return pdev->subordinate; + } + + return xa_load(&cxl_root_buses, (unsigned long)port->uport); +} +EXPORT_SYMBOL_NS_GPL(cxl_port_to_pci_bus, CXL); + +static void unregister_pci_bus(void *uport) +{ + xa_erase(&cxl_root_buses, (unsigned long)uport); +} + +int devm_cxl_register_pci_bus(struct device *host, struct device *uport, + struct pci_bus *bus) +{ + int rc; + + if (dev_is_pci(uport)) + return -EINVAL; + + rc = xa_insert(&cxl_root_buses, (unsigned long)uport, bus, GFP_KERNEL); + if (rc) + return rc; + return devm_add_action_or_reset(host, unregister_pci_bus, uport); +} +EXPORT_SYMBOL_NS_GPL(devm_cxl_register_pci_bus, CXL); + static struct cxl_dport *find_dport(struct cxl_port *port, int id) { struct cxl_dport *dport; |