60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
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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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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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