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| author | Bjorn Helgaas <bhelgaas@google.com> | 2021-03-30 20:43:16 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-03-31 20:27:03 +0300 |
| commit | 1fd3dde5e270ad08f1406f921c9a2cda154fcea9 (patch) | |
| tree | 776f7c31efd8cc6d7b201461c3c718ef120e9994 /drivers/pci/pci.c | |
| parent | c99e755a4a4c165cad6effb39faffd0f3377c02d (diff) | |
| download | linux-1fd3dde5e270ad08f1406f921c9a2cda154fcea9.tar.xz | |
PCI: Add pci_disable_parity()
Add pci_disable_parity() to disable reporting of parity errors for a
device by clearing PCI_COMMAND_PARITY.
The device will still set PCI_STATUS_DETECTED_PARITY when it detects
a parity error or receives a Poisoned TLP, but it will not set
PCI_STATUS_PARITY, which means it will not assert PERR#
(conventional PCI) or report Poisoned TLPs (PCIe).
Based-on: https://lore.kernel.org/linux-arm-kernel/d375987c-ea4f-dd98-4ef8-99b2fbfe7c33@gmail.com/
Based-on-patch-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/20210330174318.1289680-2-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 16a17215f633..b1845e5e5c8f 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4454,6 +4454,23 @@ void pci_clear_mwi(struct pci_dev *dev) EXPORT_SYMBOL(pci_clear_mwi); /** + * pci_disable_parity - disable parity checking for device + * @dev: the PCI device to operate on + * + * Disable parity checking for device @dev + */ +void pci_disable_parity(struct pci_dev *dev) +{ + u16 cmd; + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + if (cmd & PCI_COMMAND_PARITY) { + cmd &= ~PCI_COMMAND_PARITY; + pci_write_config_word(dev, PCI_COMMAND, cmd); + } +} + +/** * pci_intx - enables/disables PCI INTx for device dev * @pdev: the PCI device to operate on * @enable: boolean: whether to enable or disable PCI INTx |