@@ -161,7 +161,8 @@ static int cxl_cdat_endpoint_process(struct cxl_port *port,
static int cxl_port_perf_data_calculate(struct cxl_port *port,
struct xarray *dsmas_xa)
{
- struct access_coordinate c;
+ struct access_coordinate ep_c;
+ struct access_coordinate coord[ACCESS_COORDINATE_MAX];
struct cxl_port *root_port;
struct cxl_root *cxl_root;
struct dsmas_entry *dent;
@@ -169,9 +170,15 @@ static int cxl_port_perf_data_calculate(struct cxl_port *port,
unsigned long index;
int rc;
- rc = cxl_endpoint_get_perf_coordinates(port, &c);
+ rc = cxl_endpoint_get_perf_coordinates(port, &ep_c);
if (rc) {
- dev_dbg(&port->dev, "Failed to retrieve perf coordinates.\n");
+ dev_dbg(&port->dev, "Failed to retrieve ep perf coordinates.\n");
+ return rc;
+ }
+
+ rc = cxl_hb_get_perf_coordinates(port, coord);
+ if (rc) {
+ dev_dbg(&port->dev, "Failed to retrieve hb perf coordinates.\n");
return rc;
}
@@ -183,9 +190,19 @@ static int cxl_port_perf_data_calculate(struct cxl_port *port,
xa_for_each(dsmas_xa, index, dent) {
int qos_class;
- cxl_coordinates_combine(&dent->coord, &dent->coord, &c);
+ cxl_coordinates_combine(&dent->coord, &dent->coord, &ep_c);
+ /*
+ * Keeping the host bridge coordinates separate from the dsmas
+ * coordinates in order to allow calculation of access class
+ * 0 and 1 for region later.
+ */
+ cxl_coordinates_combine(&coord[ACCESS_COORDINATE_LOCAL],
+ &coord[ACCESS_COORDINATE_LOCAL],
+ &dent->coord);
dent->entries = 1;
- rc = cxl_root->ops->qos_class(root_port, &dent->coord, 1, &qos_class);
+ rc = cxl_root->ops->qos_class(root_port,
+ &coord[ACCESS_COORDINATE_LOCAL],
+ 1, &qos_class);
if (rc != 1)
continue;
@@ -2095,6 +2095,37 @@ bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd)
}
EXPORT_SYMBOL_NS_GPL(schedule_cxl_memdev_detach, CXL);
+/**
+ * cxl_hb_get_perf_coordinates - Retrieve performance numbers from host bridge
+ *
+ * @port: endpoint cxl_port
+ * @coord: output access coordinates
+ *
+ * Return: errno on failure, 0 on success.
+ */
+int cxl_hb_get_perf_coordinates(struct cxl_port *port,
+ struct access_coordinate *coord)
+{
+ struct cxl_port *iter = port;
+ struct cxl_dport *dport;
+
+ if (!is_cxl_endpoint(port))
+ return -EINVAL;
+
+ dport = iter->parent_dport;
+ while (iter && !is_cxl_root(to_cxl_port(iter->dev.parent))) {
+ iter = to_cxl_port(iter->dev.parent);
+ dport = iter->parent_dport;
+ }
+
+ coord[ACCESS_COORDINATE_LOCAL] =
+ dport->hb_coord[ACCESS_COORDINATE_LOCAL];
+ coord[ACCESS_COORDINATE_CPU] =
+ dport->hb_coord[ACCESS_COORDINATE_CPU];
+
+ return 0;
+}
+
/**
* cxl_endpoint_get_perf_coordinates - Retrieve performance numbers stored in dports
* of CXL path
@@ -2136,9 +2167,6 @@ int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
dport = iter->parent_dport;
}
- /* Augment with the generic port (host bridge) perf data */
- cxl_coordinates_combine(&c, &c, &dport->hb_coord[ACCESS_COORDINATE_LOCAL]);
-
/* Get the calculated PCI paths bandwidth */
pdev = to_pci_dev(port->uport_dev->parent);
bw = pcie_bandwidth_available(pdev, NULL, NULL, NULL);
@@ -878,6 +878,8 @@ void cxl_switch_parse_cdat(struct cxl_port *port);
int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
struct access_coordinate *coord);
+int cxl_hb_get_perf_coordinates(struct cxl_port *port,
+ struct access_coordinate *coord);
void cxl_coordinates_combine(struct access_coordinate *out,
struct access_coordinate *c1,
The difference between access class 0 and access class 1 for 'struct access_coordinate', if any, is that class 0 is for the distance from the target to the closest initiator and that class 1 is for the distance from the target to the cloest CPU. For CXL memory, the nearest initiator may not necessarily be a CPU node. The performance path from the CXL endpoint to the host bridge should remain the same. However, the numbers extracted and stored from HMAT is the difference for the two access classes. Split out the performance numbers for the host bridge (generic target) from the calculation of the entire path in order to allow calculation of both access classes for a CXL region. Signed-off-by: Dave Jiang <dave.jiang@intel.com> --- drivers/cxl/core/cdat.c | 27 ++++++++++++++++++++++----- drivers/cxl/core/port.c | 34 +++++++++++++++++++++++++++++++--- drivers/cxl/cxl.h | 2 ++ 3 files changed, 55 insertions(+), 8 deletions(-)