cxl/pci: Update Port GPF timeout only when the first EP attaching

update_gpf_port_dvsec() is used to update GPF Phase timeout, if a CXL
switch is under a CXL root port, update_gpf_port_dvsec() will be invoked
on the CXL root port when each cxl memory device under the CXL switch is
attaching. It is enough to be invoked once, others are redundant.

When the first EP attaching, it always triggers its ancestor dports to
locate their own Port GPF DVSEC. The change is that invoking
update_gpf_port_dvsec() on these ancestor dports after ancestor dport
locating a Port GPF DVSEC. It guarantees that update_gpf_port_dvsec() is
invoked on a dport only happens during the first EP attaching.

Signed-off-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://patch.msgid.link/20250323093110.233040-3-ming.li@zohomail.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index aab0a505d527e2a5c9c35e3d0e7e83abcf107f14..edbdaf1681e8c8aacff290db24afa0fdfaa1f127 100644 (file)
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -1130,12 +1130,11 @@ static int update_gpf_port_dvsec(struct pci_dev *pdev, int dvsec, int phase)
 
 int cxl_gpf_port_setup(struct cxl_dport *dport)
 {
-       struct pci_dev *pdev;
-
        if (!dport)
                return -EINVAL;
 
        if (!dport->gpf_dvsec) {
+               struct pci_dev *pdev;
                int dvsec;
 
                dvsec = cxl_gpf_get_dvsec(dport->dport_dev, true);
@@ -1143,11 +1142,10 @@ int cxl_gpf_port_setup(struct cxl_dport *dport)
                        return -EINVAL;
 
                dport->gpf_dvsec = dvsec;
+               pdev = to_pci_dev(dport->dport_dev);
+               update_gpf_port_dvsec(pdev, dport->gpf_dvsec, 1);
+               update_gpf_port_dvsec(pdev, dport->gpf_dvsec, 2);
        }
 
-       pdev = to_pci_dev(dport->dport_dev);
-       update_gpf_port_dvsec(pdev, dport->gpf_dvsec, 1);
-       update_gpf_port_dvsec(pdev, dport->gpf_dvsec, 2);
-
        return 0;
 }