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| author | Dan Williams <dan.j.williams@intel.com> | 2021-06-09 09:01:46 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2021-06-09 18:02:39 -0700 |
| commit | 7d4b5ca2e2cb5d28db628ec79c706bcfa832feea (patch) | |
| tree | 833b93b5d980d417f1bac66dff19607dbb15c409 /drivers/cxl/cxl.h | |
| parent | 3feaa2d35880de935fc0d02acf808f355564f4e6 (diff) | |
| download | linux-7d4b5ca2e2cb5d28db628ec79c706bcfa832feea.tar.bz2 | |
cxl/acpi: Add downstream port data to cxl_port instances
In preparation for infrastructure that enumerates and configures the CXL
decode mechanism of an upstream port to its downstream ports, add a
representation of a CXL downstream port.
On ACPI systems the top-most logical downstream ports in the hierarchy
are the host bridges (ACPI0016 devices) that decode the memory windows
described by the CXL Early Discovery Table Fixed Memory Window
Structures (CEDT.CFMWS).
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/r/162325450624.2293126.3533006409920271718.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/cxl.h')
| -rw-r--r-- | drivers/cxl/cxl.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 5651e5bb8274..dd159fd6d692 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -154,6 +154,7 @@ int cxl_map_device_regs(struct pci_dev *pdev, struct cxl_register_map *map); #define CXL_RESOURCE_NONE ((resource_size_t) -1) +#define CXL_TARGET_STRLEN 20 /** * struct cxl_port - logical collection of upstream port devices and @@ -162,19 +163,39 @@ int cxl_map_device_regs(struct pci_dev *pdev, * @dev: this port's device * @uport: PCI or platform device implementing the upstream port capability * @id: id for port device-name + * @dports: cxl_dport instances referenced by decoders * @component_reg_phys: component register capability base address (optional) */ struct cxl_port { struct device dev; struct device *uport; int id; + struct list_head dports; resource_size_t component_reg_phys; }; +/** + * struct cxl_dport - CXL downstream port + * @dport: PCI bridge or firmware device representing the downstream link + * @port_id: unique hardware identifier for dport in decoder target list + * @component_reg_phys: downstream port component registers + * @port: reference to cxl_port that contains this downstream port + * @list: node for a cxl_port's list of cxl_dport instances + */ +struct cxl_dport { + struct device *dport; + int port_id; + resource_size_t component_reg_phys; + struct cxl_port *port; + struct list_head list; +}; + struct cxl_port *to_cxl_port(struct device *dev); struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport, resource_size_t component_reg_phys, struct cxl_port *parent_port); +int cxl_add_dport(struct cxl_port *port, struct device *dport, int port_id, + resource_size_t component_reg_phys); extern struct bus_type cxl_bus_type; #endif /* __CXL_H__ */ |