From: Dan Williams Date: Sat, 31 Jan 2026 00:04:03 +0000 (-0800) Subject: cxl/port: Unify endpoint and switch port lookup X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d2b3fe002797c8de2c71236662593bf36de834d;p=thirdparty%2Fkernel%2Flinux.git cxl/port: Unify endpoint and switch port lookup In support of generic CXL protocol error handling across various 'struct cxl_port' types, update find_cxl_port_by_uport() to retrieve endpoint CXL port companions from endpoint PCIe device instances. The end result is that upstream switch ports and endpoint ports can share error handling and eventually delete the misplaced cxl_error_handlers from the cxl_pci class driver. Reviewed-by: Terry Bowman Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Tested-by: Terry Bowman Signed-off-by: Dan Williams Link: https://patch.msgid.link/20260131000403.2135324-10-dan.j.williams@intel.com Signed-off-by: Dave Jiang --- diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 9f56f7e75e81c..ee7d145288673 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -1590,10 +1590,20 @@ static int match_port_by_uport(struct device *dev, const void *data) return 0; port = to_cxl_port(dev); + /* Endpoint ports are hosted by memdevs */ + if (is_cxl_memdev(port->uport_dev)) + return uport_dev == port->uport_dev->parent; return uport_dev == port->uport_dev; } -/* +/** + * find_cxl_port_by_uport - Find a CXL port device companion + * @uport_dev: Device that acts as a switch or endpoint in the CXL hierarchy + * + * In the case of endpoint ports recall that port->uport_dev points to a 'struct + * cxl_memdev' device. So, the @uport_dev argument is the parent device of the + * 'struct cxl_memdev' in that case. + * * Function takes a device reference on the port device. Caller should do a * put_device() when done. */