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190 lines
4.4 KiB
190 lines
4.4 KiB
// 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 <[email protected]> |
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* Qiuxu Zhuo <[email protected]> |
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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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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 == PCI_SLOT(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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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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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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} |
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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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} |
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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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