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authorSean V Kelley <sean.v.kelley@intel.com>2020-11-20 16:10:32 -0800
committerBjorn Helgaas <bhelgaas@google.com>2020-12-05 15:26:02 -0600
commit507b460f814458605c47b0ed03c11e49a712fc08 (patch)
tree201bf61baf5e20ee27b5c9ccb5952f0c080e4f76 /drivers/pci/pcie
parenta175102b0a82fc57853a9e611c42d1d6172e5180 (diff)
PCI/ERR: Add pcie_link_rcec() to associate RCiEPs
A Root Complex Event Collector terminates error and PME messages from associated RCiEPs. Use the RCEC Endpoint Association Extended Capability to identify associated RCiEPs. Link the associated RCiEPs as the RCECs are enumerated. Co-developed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com> Link: https://lore.kernel.org/r/20201121001036.8560-12-sean.v.kelley@intel.com Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # non-native/no RCEC Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com> Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/pci/pcie')
-rw-r--r--drivers/pci/pcie/portdrv_pci.c3
-rw-r--r--drivers/pci/pcie/rcec.c94
2 files changed, 97 insertions, 0 deletions
diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index ff9517ee92b3..0b250bc5f405 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -111,6 +111,9 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
(type != PCI_EXP_TYPE_RC_EC)))
return -ENODEV;
+ if (type == PCI_EXP_TYPE_RC_EC)
+ pcie_link_rcec(dev);
+
status = pcie_port_device_register(dev);
if (status)
return status;
diff --git a/drivers/pci/pcie/rcec.c b/drivers/pci/pcie/rcec.c
index 038e9d706d5f..cdec277cbd62 100644
--- a/drivers/pci/pcie/rcec.c
+++ b/drivers/pci/pcie/rcec.c
@@ -15,6 +15,100 @@
#include "../pci.h"
+struct walk_rcec_data {
+ struct pci_dev *rcec;
+ int (*user_callback)(struct pci_dev *dev, void *data);
+ void *user_data;
+};
+
+static bool rcec_assoc_rciep(struct pci_dev *rcec, struct pci_dev *rciep)
+{
+ unsigned long bitmap = rcec->rcec_ea->bitmap;
+ unsigned int devn;
+
+ /* An RCiEP found on a different bus in range */
+ if (rcec->bus->number != rciep->bus->number)
+ return true;
+
+ /* Same bus, so check bitmap */
+ for_each_set_bit(devn, &bitmap, 32)
+ if (devn == rciep->devfn)
+ return true;
+
+ return false;
+}
+
+static int link_rcec_helper(struct pci_dev *dev, void *data)
+{
+ struct walk_rcec_data *rcec_data = data;
+ struct pci_dev *rcec = rcec_data->rcec;
+
+ if ((pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) &&
+ rcec_assoc_rciep(rcec, dev)) {
+ dev->rcec = rcec;
+ pci_dbg(dev, "PME & error events signaled via %s\n",
+ pci_name(rcec));
+ }
+
+ return 0;
+}
+
+static void walk_rcec(int (*cb)(struct pci_dev *dev, void *data),
+ void *userdata)
+{
+ struct walk_rcec_data *rcec_data = userdata;
+ struct pci_dev *rcec = rcec_data->rcec;
+ u8 nextbusn, lastbusn;
+ struct pci_bus *bus;
+ unsigned int bnr;
+
+ if (!rcec->rcec_ea)
+ return;
+
+ /* Walk own bus for bitmap based association */
+ pci_walk_bus(rcec->bus, cb, rcec_data);
+
+ nextbusn = rcec->rcec_ea->nextbusn;
+ lastbusn = rcec->rcec_ea->lastbusn;
+
+ /* All RCiEP devices are on the same bus as the RCEC */
+ if (nextbusn == 0xff && lastbusn == 0x00)
+ return;
+
+ for (bnr = nextbusn; bnr <= lastbusn; bnr++) {
+ /* No association indicated (PCIe 5.0-1, 7.9.10.3) */
+ if (bnr == rcec->bus->number)
+ continue;
+
+ bus = pci_find_bus(pci_domain_nr(rcec->bus), bnr);
+ if (!bus)
+ continue;
+
+ /* Find RCiEP devices on the given bus ranges */
+ pci_walk_bus(bus, cb, rcec_data);
+ }
+}
+
+/**
+ * pcie_link_rcec - Link RCiEP devices associated with RCEC.
+ * @rcec: RCEC whose RCiEP devices should be linked.
+ *
+ * Link the given RCEC to each RCiEP device found.
+ */
+void pcie_link_rcec(struct pci_dev *rcec)
+{
+ struct walk_rcec_data rcec_data;
+
+ if (!rcec->rcec_ea)
+ return;
+
+ rcec_data.rcec = rcec;
+ rcec_data.user_callback = NULL;
+ rcec_data.user_data = NULL;
+
+ walk_rcec(link_rcec_helper, &rcec_data);
+}
+
void pci_rcec_init(struct pci_dev *dev)
{
struct rcec_ea *rcec_ea;