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PCI: Add pci_disable_parity()

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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>
This commit is contained in:
Bjorn Helgaas
2021-03-30 12:43:16 -05:00
parent c99e755a4a
commit 1fd3dde5e2
2 changed files with 18 additions and 0 deletions
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17
drivers/pci/pci.c
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@@ -4453,6 +4453,23 @@ void pci_clear_mwi(struct pci_dev *dev)
} }
EXPORT_SYMBOL(pci_clear_mwi); 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 * pci_intx - enables/disables PCI INTx for device dev
* @pdev: the PCI device to operate on * @pdev: the PCI device to operate on

1
include/linux/pci.h
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@@ -1201,6 +1201,7 @@ int __must_check pci_set_mwi(struct pci_dev *dev);
int __must_check pcim_set_mwi(struct pci_dev *dev); int __must_check pcim_set_mwi(struct pci_dev *dev);
int pci_try_set_mwi(struct pci_dev *dev); int pci_try_set_mwi(struct pci_dev *dev);
void pci_clear_mwi(struct pci_dev *dev); void pci_clear_mwi(struct pci_dev *dev);
void pci_disable_parity(struct pci_dev *dev);
void pci_intx(struct pci_dev *dev, int enable); void pci_intx(struct pci_dev *dev, int enable);
bool pci_check_and_mask_intx(struct pci_dev *dev); bool pci_check_and_mask_intx(struct pci_dev *dev);
bool pci_check_and_unmask_intx(struct pci_dev *dev); bool pci_check_and_unmask_intx(struct pci_dev *dev);