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author | Robert Richter <rrichter@amd.com> | 2023-06-22 23:55:10 +0300 |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2023-06-25 22:22:44 +0300 |
commit | 19ab69a60e3ba58b4942b9ab5095cf90477a54ce (patch) | |
tree | 7f8d4f4ed43b33464439ef29add8c1d1f031fea4 /drivers/cxl/core | |
parent | 733b57f262b0e9f05ffeac102fe5bd729e263170 (diff) | |
download | linux-19ab69a60e3ba58b4942b9ab5095cf90477a54ce.tar.xz |
cxl/port: Store the port's Component Register mappings in struct cxl_port
CXL capabilities are stored in the Component Registers. To use them,
the specific I/O ranges of the capabilities must be determined by
probing the registers. For this, the whole Component Register range
needs to be mapped temporarily to detect the offset and length of a
capability range.
In order to use more than one capability of a component (e.g. RAS and
HDM) the Component Register are probed and its mappings created
multiple times. This also causes overlapping I/O ranges as the whole
Component Register range must be mapped again while a capability's I/O
range is already mapped.
Different capabilities cannot be setup at the same time. E.g. the RAS
capability must be made available as soon as the PCI driver is bound,
the HDM decoder is setup later during port enumeration. Moreover,
during early setup it is still unknown if a certain capability is
needed. A central capability setup is therefore not possible,
capabilities must be individually enabled once needed during
initialization.
To avoid a duplicate register probe and overlapping I/O mappings, only
probe the Component Registers one time and store the Component
Register mapping in struct port. The stored mappings can be used later
to iomap the capability register range when enabling the capability,
which will be implemented in a follow-on patch.
Signed-off-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20230622205523.85375-15-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/core')
-rw-r--r-- | drivers/cxl/core/port.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 679226023f0c..43ffecebf1d8 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -688,6 +688,29 @@ err: return ERR_PTR(rc); } +static int cxl_setup_comp_regs(struct device *dev, 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) { + .dev = dev, + .reg_type = CXL_REGLOC_RBI_COMPONENT, + .resource = component_reg_phys, + .max_size = CXL_COMPONENT_REG_BLOCK_SIZE, + }; + + return cxl_setup_regs(map); +} + +static inline int cxl_port_setup_regs(struct cxl_port *port, + resource_size_t component_reg_phys) +{ + return cxl_setup_comp_regs(&port->dev, &port->comp_map, + component_reg_phys); +} + static struct cxl_port *__devm_cxl_add_port(struct device *host, struct device *uport_dev, resource_size_t component_reg_phys, @@ -711,6 +734,10 @@ static struct cxl_port *__devm_cxl_add_port(struct device *host, if (rc) goto err; + rc = cxl_port_setup_regs(port, component_reg_phys); + if (rc) + goto err; + rc = device_add(dev); if (rc) goto err; |