pci_fixup.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Exceptions for specific devices,
 4 *
 5 * Copyright IBM Corp. 2025
 6 *
 7 * Author(s):
 8 *   Niklas Schnelle <schnelle@linux.ibm.com>
 9 */
10#include <linux/pci.h>
11
12static void zpci_ism_bar_no_mmap(struct pci_dev *pdev)
13{
14	/*
15	 * ISM's BAR is special. Drivers written for ISM know
16	 * how to handle this but others need to be aware of their
17	 * special nature e.g. to prevent attempts to mmap() it.
18	 */
19	pdev->non_mappable_bars = 1;
20}
21DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_IBM,
22			PCI_DEVICE_ID_IBM_ISM,
23			zpci_ism_bar_no_mmap);