diff options
author | Robert Richter <rrichter@amd.com> | 2023-10-18 20:16:58 +0300 |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2023-10-28 06:13:37 +0300 |
commit | 4d758764e7f9db83806135f3bfcff1ab64f16e60 (patch) | |
tree | fe3e73cb06fadd8f540a584a13c18c079c51996a /drivers/cxl | |
parent | d8add49263a98d766e5758dc2ec9f83c3b685c12 (diff) | |
download | linux-4d758764e7f9db83806135f3bfcff1ab64f16e60.tar.xz |
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>
Diffstat (limited to 'drivers/cxl')
-rw-r--r-- | drivers/cxl/core/port.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index f6ced15dbf73..252aa3dc96e2 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -694,16 +694,18 @@ err: static int cxl_setup_comp_regs(struct device *host, struct cxl_register_map *map, resource_size_t 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, + .reg_type = CXL_REGLOC_RBI_EMPTY, .resource = component_reg_phys, - .max_size = CXL_COMPONENT_REG_BLOCK_SIZE, }; + if (component_reg_phys == CXL_RESOURCE_NONE) + return 0; + + map->reg_type = CXL_REGLOC_RBI_COMPONENT; + map->max_size = CXL_COMPONENT_REG_BLOCK_SIZE; + return cxl_setup_regs(map); } |