9065563198
Extend support for Root Complex Event Collectors by decoding and caching the RCEC Endpoint Association Extended Capabilities when enumerating. Use that cached information for later error source reporting. See PCIe r5.0, sec 7.9.10. Co-developed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com> Link: https://lore.kernel.org/r/20201121001036.8560-4-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>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
// 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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