64ae499cf2
- move pcieport_if.h to drivers/pci/pcie/ to encapsulate it (Frederick
Lawler)
- merge pcieport_if.h into portdrv.h (Bjorn Helgaas)
- move workaround for BIOS PME issue from portdrv to PCI core (Bjorn
Helgaas)
- completely disable portdrv with "pcie_ports=compat" (Bjorn Helgaas)
- remove portdrv link order dependency (Bjorn Helgaas)
- remove support for unused VC portdrv service (Bjorn Helgaas)
- simplify portdrv feature permission checking (Bjorn Helgaas)
- remove "pcie_hp=nomsi" parameter (use "pci=nomsi" instead) (Bjorn
Helgaas)
- remove unnecessary "pcie_ports=auto" parameter (Bjorn Helgaas)
- use cached AER capability offset (Frederick Lawler)
- don't enable DPC if BIOS hasn't granted AER control (Mika Westerberg)
- rename pcie-dpc.c to dpc.c (Bjorn Helgaas)
* pci/portdrv:
PCI/DPC: Rename from pcie-dpc.c to dpc.c
PCI/DPC: Do not enable DPC if AER control is not allowed by the BIOS
PCI/AER: Use cached AER Capability offset
PCI/portdrv: Rename and reverse sense of pcie_ports_auto
PCI/portdrv: Encapsulate pcie_ports_auto inside the port driver
PCI/portdrv: Remove unnecessary "pcie_ports=auto" parameter
PCI/portdrv: Remove "pcie_hp=nomsi" kernel parameter
PCI/portdrv: Remove unnecessary include of <linux/pci-aspm.h>
PCI/portdrv: Simplify PCIe feature permission checking
PCI/portdrv: Remove unused PCIE_PORT_SERVICE_VC
PCI/portdrv: Remove pcie_port_bus_type link order dependency
PCI/portdrv: Disable port driver in compat mode
PCI/PM: Clear PCIe PME Status bit for Root Complex Event Collectors
PCI/PM: Clear PCIe PME Status bit in core, not PCIe port driver
PCI/PM: Move pcie_clear_root_pme_status() to core
PCI/portdrv: Merge pcieport_if.h into portdrv.h
PCI/portdrv: Move pcieport_if.h to drivers/pci/pcie/
Conflicts:
drivers/pci/pcie/Makefile
drivers/pci/pcie/portdrv.h
118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Enable/disable PCIe ECRC checking
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*
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* (C) Copyright 2009 Hewlett-Packard Development Company, L.P.
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* Andrew Patterson <andrew.patterson@hp.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/pci.h>
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#include <linux/pci_regs.h>
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#include <linux/errno.h>
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#include "../../pci.h"
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#define ECRC_POLICY_DEFAULT 0 /* ECRC set by BIOS */
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#define ECRC_POLICY_OFF 1 /* ECRC off for performance */
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#define ECRC_POLICY_ON 2 /* ECRC on for data integrity */
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static int ecrc_policy = ECRC_POLICY_DEFAULT;
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static const char *ecrc_policy_str[] = {
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[ECRC_POLICY_DEFAULT] = "bios",
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[ECRC_POLICY_OFF] = "off",
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[ECRC_POLICY_ON] = "on"
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};
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/**
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* enable_ercr_checking - enable PCIe ECRC checking for a device
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* @dev: the PCI device
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*
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* Returns 0 on success, or negative on failure.
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*/
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static int enable_ecrc_checking(struct pci_dev *dev)
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{
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int pos;
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u32 reg32;
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if (!pci_is_pcie(dev))
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return -ENODEV;
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pos = dev->aer_cap;
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if (!pos)
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return -ENODEV;
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pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
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if (reg32 & PCI_ERR_CAP_ECRC_GENC)
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reg32 |= PCI_ERR_CAP_ECRC_GENE;
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if (reg32 & PCI_ERR_CAP_ECRC_CHKC)
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reg32 |= PCI_ERR_CAP_ECRC_CHKE;
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pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
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return 0;
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}
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/**
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* disable_ercr_checking - disables PCIe ECRC checking for a device
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* @dev: the PCI device
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*
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* Returns 0 on success, or negative on failure.
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*/
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static int disable_ecrc_checking(struct pci_dev *dev)
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{
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int pos;
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u32 reg32;
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if (!pci_is_pcie(dev))
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return -ENODEV;
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pos = dev->aer_cap;
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if (!pos)
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return -ENODEV;
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pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
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reg32 &= ~(PCI_ERR_CAP_ECRC_GENE | PCI_ERR_CAP_ECRC_CHKE);
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pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
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return 0;
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}
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/**
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* pcie_set_ecrc_checking - set/unset PCIe ECRC checking for a device based on global policy
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* @dev: the PCI device
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*/
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void pcie_set_ecrc_checking(struct pci_dev *dev)
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{
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switch (ecrc_policy) {
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case ECRC_POLICY_DEFAULT:
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return;
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case ECRC_POLICY_OFF:
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disable_ecrc_checking(dev);
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break;
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case ECRC_POLICY_ON:
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enable_ecrc_checking(dev);
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break;
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default:
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return;
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}
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}
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/**
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* pcie_ecrc_get_policy - parse kernel command-line ecrc option
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*/
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void pcie_ecrc_get_policy(char *str)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ecrc_policy_str); i++)
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if (!strncmp(str, ecrc_policy_str[i],
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strlen(ecrc_policy_str[i])))
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break;
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if (i >= ARRAY_SIZE(ecrc_policy_str))
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return;
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ecrc_policy = i;
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}
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