cxl/port: Pre-initialize component register mappings

The component registers of a component may not exist and
cxl_setup_comp_regs() will fail for that reason. In another case,
Software may not use and set those registers up. cxl_setup_comp_regs()
is then called with a base address of CXL_RESOURCE_NONE. Both are
valid cases, but the function returns without initializing the
register map.

Now, a missing component register block is not necessarily a reason to
fail (feature is optional or its existence checked later). Change
cxl_setup_comp_regs() to also use components with the component
register block missing. Thus, always initialize struct
cxl_register_map with valid values, set @dev and make @resource
CXL_RESOURCE_NONE.

The change is in preparation of follow-on patches.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20231018171713.1883517-6-rrichter@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Robert Richter 2023-10-18 19:16:58 +02:00 committed by Dan Williams
parent d8add49263
commit 4d758764e7

View File

@ -694,15 +694,17 @@ static struct cxl_port *cxl_port_alloc(struct device *uport_dev,
static int cxl_setup_comp_regs(struct device *host, struct cxl_register_map *map,
resource_size_t component_reg_phys)
{
*map = (struct cxl_register_map) {
.host = host,
.reg_type = CXL_REGLOC_RBI_EMPTY,
.resource = component_reg_phys,
};
if (component_reg_phys == CXL_RESOURCE_NONE)
return 0;
*map = (struct cxl_register_map) {
.host = host,
.reg_type = CXL_REGLOC_RBI_COMPONENT,
.resource = component_reg_phys,
.max_size = CXL_COMPONENT_REG_BLOCK_SIZE,
};
map->reg_type = CXL_REGLOC_RBI_COMPONENT;
map->max_size = CXL_COMPONENT_REG_BLOCK_SIZE;
return cxl_setup_regs(map);
}