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/core/hdm.c | |
| 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/core/hdm.c')
| -rw-r--r-- | drivers/cxl/core/hdm.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index 960a77864f33..96346c6be021 100644 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@ -50,8 +50,9 @@ static int add_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld, int devm_cxl_add_passthrough_decoder(struct cxl_port *port) { struct cxl_switch_decoder *cxlsd; - struct cxl_dport *dport; + struct cxl_dport *dport = NULL; int single_port_map[1]; + unsigned long index; cxlsd = cxl_switch_decoder_alloc(port, 1); if (IS_ERR(cxlsd)) @@ -59,7 +60,8 @@ int devm_cxl_add_passthrough_decoder(struct cxl_port *port) device_lock_assert(&port->dev); - dport = list_first_entry(&port->dports, typeof(*dport), list); + xa_for_each(&port->dports, index, dport) + break; single_port_map[0] = dport->port_id; return add_hdm_decoder(port, &cxlsd->cxld, single_port_map); |