b444c1dc26
[ Upstream commit 90655631988f8f501529e6de5f13614389717ead ] 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> Stable-dep-of: 627c6db20703 ("PCI/DPC: Quirk PIO log size for Intel Raptor Lake Root Ports") Signed-off-by: Sasha Levin <sashal@kernel.org>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
// 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;
|
|
}
|