diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2022-05-27 20:51:19 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-07-21 17:19:24 -0700 |
| commit | 391785859e7e6521f622ad8c965c9792767023bc (patch) | |
| tree | ebbdac616cd6b926d65dccbb3357e5b89091e4ad /drivers/cxl/cxl.h | |
| parent | 256d0e9ee4f2f14d30b93fd593cef3108b0527ca (diff) | |
cxl/port: Move dport tracking to an xarray
Reduce the complexity and the overhead of walking the topology to
determine endpoint connectivity to root decoder interleave
configurations.
Note that cxl_detach_ep(), after it determines that the last @ep has
departed and decides to delete the port, now needs to walk the dport
array with the device_lock() held to remove entries. Previously
list_splice_init() could be used atomically delete all dport entries at
once and then perform entry tear down outside the lock. There is no
list_splice_init() equivalent for the xarray.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165784331647.1758207.6345820282285119339.stgit@dwillia2-xfh.jf.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 | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index f1dd60c86e2a..ac950fb45dd2 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -346,7 +346,7 @@ struct cxl_port { struct device *uport; struct device *host_bridge; int id; - struct list_head dports; + struct xarray dports; struct xarray endpoints; struct cxl_dport *parent_dport; struct ida decoder_ida; @@ -361,20 +361,24 @@ struct cxl_port { bool cdat_available; }; +static inline struct cxl_dport * +cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev) +{ + return xa_load(&port->dports, (unsigned long)dport_dev); +} + /** * 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; }; /** @@ -417,8 +421,6 @@ bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd); struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port, struct device *dport, int port_id, resource_size_t component_reg_phys); -struct cxl_dport *cxl_find_dport_by_dev(struct cxl_port *port, - const struct device *dev); struct cxl_decoder *to_cxl_decoder(struct device *dev); struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev); |