Jonathan Cameron wrote: > On Thu, 23 Jun 2022 21:19:33 -0700 > Dan Williams <[email protected]> wrote: > > > Region creation has need for checking host-bridge connectivity when > > adding endpoints to regions. Record, at port creation time, the > > host-bridge to provide a useful shortcut from any location in the > > topology to the most-significant ancestor. > > > > Signed-off-by: Dan Williams <[email protected]> > Trivial comment inline, but otherwise seems reasonable to me. > > Reviewed-by: Jonathan Cameron <[email protected]> > > > --- > > drivers/cxl/core/port.c | 16 +++++++++++++++- > > drivers/cxl/cxl.h | 2 ++ > > 2 files changed, 17 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c > > index d2f6898940fa..c48f217e689a 100644 > > --- a/drivers/cxl/core/port.c > > +++ b/drivers/cxl/core/port.c > > @@ -546,6 +546,7 @@ static struct cxl_port *cxl_port_alloc(struct device > > *uport, > > if (rc < 0) > > goto err; > > port->id = rc; > > + port->uport = uport; > > > > /* > > * The top-level cxl_port "cxl_root" does not have a cxl_port as > > @@ -556,14 +557,27 @@ static struct cxl_port *cxl_port_alloc(struct device > > *uport, > > dev = &port->dev; > > if (parent_dport) { > > struct cxl_port *parent_port = parent_dport->port; > > + struct cxl_port *iter; > > > > port->depth = parent_port->depth + 1; > > port->parent_dport = parent_dport; > > dev->parent = &parent_port->dev; > > + /* > > + * walk to the host bridge, or the first ancestor that knows > > + * the host bridge > > + */ > > + iter = port; > > + while (!iter->host_bridge && > > + !is_cxl_root(to_cxl_port(iter->dev.parent))) > > + iter = to_cxl_port(iter->dev.parent); > > + if (iter->host_bridge) > > + port->host_bridge = iter->host_bridge; > > + else > > + port->host_bridge = iter->uport; > > + dev_dbg(uport, "host-bridge: %s\n", > > dev_name(port->host_bridge)); > > } else > > dev->parent = uport; > > > > - port->uport = uport; > > port->component_reg_phys = component_reg_phys; > > ida_init(&port->decoder_ida); > > port->dpa_end = -1; > > diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h > > index 8e2c1b393552..0211cf0d3574 100644 > > --- a/drivers/cxl/cxl.h > > +++ b/drivers/cxl/cxl.h > > @@ -331,6 +331,7 @@ struct cxl_nvdimm { > > * @component_reg_phys: component register capability base address > > (optional) > > * @dead: last ep has been removed, force port re-creation > > * @depth: How deep this port is relative to the root. depth 0 is the root. > > + * @host_bridge: Shortcut to the platform attach point for this port > > */ > > struct cxl_port { > > struct device dev; > > @@ -344,6 +345,7 @@ struct cxl_port { > > resource_size_t component_reg_phys; > > bool dead; > > unsigned int depth; > > + struct device *host_bridge; > Would feel more natural up next to the struct device *uport element of > cxl_port.
Done.
