2020-11-21 08:10:24 +08:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Root Complex Event Collector Support
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*
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* Authors:
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* Sean V Kelley <sean.v.kelley@intel.com>
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* Qiuxu Zhuo <qiuxu.zhuo@intel.com>
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*
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* Copyright (C) 2020 Intel Corp.
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci_regs.h>
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#include "../pci.h"
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2020-11-21 08:10:32 +08:00
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struct walk_rcec_data {
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struct pci_dev *rcec;
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int (*user_callback)(struct pci_dev *dev, void *data);
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void *user_data;
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};
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static bool rcec_assoc_rciep(struct pci_dev *rcec, struct pci_dev *rciep)
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{
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unsigned long bitmap = rcec->rcec_ea->bitmap;
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unsigned int devn;
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/* An RCiEP found on a different bus in range */
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if (rcec->bus->number != rciep->bus->number)
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return true;
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/* Same bus, so check bitmap */
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for_each_set_bit(devn, &bitmap, 32)
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if (devn == rciep->devfn)
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return true;
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return false;
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}
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static int link_rcec_helper(struct pci_dev *dev, void *data)
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{
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struct walk_rcec_data *rcec_data = data;
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struct pci_dev *rcec = rcec_data->rcec;
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if ((pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) &&
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rcec_assoc_rciep(rcec, dev)) {
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dev->rcec = rcec;
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pci_dbg(dev, "PME & error events signaled via %s\n",
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pci_name(rcec));
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}
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return 0;
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}
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2020-11-21 08:10:34 +08:00
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static int walk_rcec_helper(struct pci_dev *dev, void *data)
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{
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struct walk_rcec_data *rcec_data = data;
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struct pci_dev *rcec = rcec_data->rcec;
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if ((pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) &&
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rcec_assoc_rciep(rcec, dev))
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rcec_data->user_callback(dev, rcec_data->user_data);
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return 0;
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}
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2020-11-21 08:10:32 +08:00
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static void walk_rcec(int (*cb)(struct pci_dev *dev, void *data),
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void *userdata)
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{
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struct walk_rcec_data *rcec_data = userdata;
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struct pci_dev *rcec = rcec_data->rcec;
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u8 nextbusn, lastbusn;
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struct pci_bus *bus;
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unsigned int bnr;
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if (!rcec->rcec_ea)
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return;
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/* Walk own bus for bitmap based association */
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pci_walk_bus(rcec->bus, cb, rcec_data);
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nextbusn = rcec->rcec_ea->nextbusn;
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lastbusn = rcec->rcec_ea->lastbusn;
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/* All RCiEP devices are on the same bus as the RCEC */
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if (nextbusn == 0xff && lastbusn == 0x00)
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return;
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for (bnr = nextbusn; bnr <= lastbusn; bnr++) {
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/* No association indicated (PCIe 5.0-1, 7.9.10.3) */
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if (bnr == rcec->bus->number)
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continue;
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bus = pci_find_bus(pci_domain_nr(rcec->bus), bnr);
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if (!bus)
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continue;
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/* Find RCiEP devices on the given bus ranges */
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pci_walk_bus(bus, cb, rcec_data);
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}
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}
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/**
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* pcie_link_rcec - Link RCiEP devices associated with RCEC.
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* @rcec: RCEC whose RCiEP devices should be linked.
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*
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* Link the given RCEC to each RCiEP device found.
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*/
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void pcie_link_rcec(struct pci_dev *rcec)
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{
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struct walk_rcec_data rcec_data;
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if (!rcec->rcec_ea)
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return;
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rcec_data.rcec = rcec;
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rcec_data.user_callback = NULL;
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rcec_data.user_data = NULL;
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walk_rcec(link_rcec_helper, &rcec_data);
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2020-11-21 08:10:34 +08:00
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}
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/**
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* pcie_walk_rcec - Walk RCiEP devices associating with RCEC and call callback.
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* @rcec: RCEC whose RCiEP devices should be walked
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* @cb: Callback to be called for each RCiEP device found
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* @userdata: Arbitrary pointer to be passed to callback
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*
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* Walk the given RCEC. Call the callback on each RCiEP found.
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*
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* If @cb returns anything other than 0, break out.
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*/
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void pcie_walk_rcec(struct pci_dev *rcec, int (*cb)(struct pci_dev *, void *),
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void *userdata)
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{
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struct walk_rcec_data rcec_data;
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if (!rcec->rcec_ea)
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return;
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rcec_data.rcec = rcec;
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rcec_data.user_callback = cb;
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rcec_data.user_data = userdata;
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walk_rcec(walk_rcec_helper, &rcec_data);
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2020-11-21 08:10:32 +08:00
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}
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2020-11-21 08:10:24 +08:00
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void pci_rcec_init(struct pci_dev *dev)
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{
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struct rcec_ea *rcec_ea;
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u32 rcec, hdr, busn;
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u8 ver;
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/* Only for Root Complex Event Collectors */
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if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_EC)
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return;
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rcec = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_RCEC);
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if (!rcec)
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return;
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rcec_ea = kzalloc(sizeof(*rcec_ea), GFP_KERNEL);
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if (!rcec_ea)
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return;
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pci_read_config_dword(dev, rcec + PCI_RCEC_RCIEP_BITMAP,
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&rcec_ea->bitmap);
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/* Check whether RCEC BUSN register is present */
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pci_read_config_dword(dev, rcec, &hdr);
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ver = PCI_EXT_CAP_VER(hdr);
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if (ver >= PCI_RCEC_BUSN_REG_VER) {
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pci_read_config_dword(dev, rcec + PCI_RCEC_BUSN, &busn);
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rcec_ea->nextbusn = PCI_RCEC_BUSN_NEXT(busn);
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rcec_ea->lastbusn = PCI_RCEC_BUSN_LAST(busn);
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} else {
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/* Avoid later ver check by setting nextbusn */
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rcec_ea->nextbusn = 0xff;
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rcec_ea->lastbusn = 0x00;
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}
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dev->rcec_ea = rcec_ea;
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}
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void pci_rcec_exit(struct pci_dev *dev)
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{
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kfree(dev->rcec_ea);
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dev->rcec_ea = NULL;
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}
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