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// SPDX-License-Identifier: GPL-2.0
/*
* Root Complex Event Collector Support
*
* Authors:
* Sean V Kelley <sean.v.kelley@intel.com>
* Qiuxu Zhuo <qiuxu.zhuo@intel.com>
*
* Copyright (C) 2020 Intel Corp.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include "../pci.h"
void pci_rcec_init(struct pci_dev *dev)
{
struct rcec_ea *rcec_ea;
u32 rcec, hdr, busn;
u8 ver;
/* Only for Root Complex Event Collectors */
if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_EC)
return;
rcec = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_RCEC);
if (!rcec)
return;
rcec_ea = kzalloc(sizeof(*rcec_ea), GFP_KERNEL);
if (!rcec_ea)
return;
pci_read_config_dword(dev, rcec + PCI_RCEC_RCIEP_BITMAP,
&rcec_ea->bitmap);
/* Check whether RCEC BUSN register is present */
pci_read_config_dword(dev, rcec, &hdr);
ver = PCI_EXT_CAP_VER(hdr);
if (ver >= PCI_RCEC_BUSN_REG_VER) {
pci_read_config_dword(dev, rcec + PCI_RCEC_BUSN, &busn);
rcec_ea->nextbusn = PCI_RCEC_BUSN_NEXT(busn);
rcec_ea->lastbusn = PCI_RCEC_BUSN_LAST(busn);
} else {
/* Avoid later ver check by setting nextbusn */
rcec_ea->nextbusn = 0xff;
rcec_ea->lastbusn = 0x00;
}
dev->rcec_ea = rcec_ea;
}
void pci_rcec_exit(struct pci_dev *dev)
{
kfree(dev->rcec_ea);
dev->rcec_ea = NULL;
}
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