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Raghavendra Rao AnantaandAlex Williamson
c5db77a035
Introduce a sysfs library to handle the common reads/writes to the PCI sysfs files, for example, getting the total number of VFs supported by the device via /sys/bus/pci/devices/$BDF/sriov_totalvfs. The library will be used in the upcoming test patch to configure the VFs for a given PF device. Since readlink() is quite commonly used in the lib, introduce and use readlink_safe() to take care of potential buffer overrun errors and to safely terminate the buffer with '\0'. Opportunistically, move vfio_pci_get_group_from_dev() to this library as it falls under the same bucket. Rename it to sysfs_iommu_group_get() to align with other function names. Signed-off-by: Raghavendra Rao Ananta <rananta@google.com> Reviewed-by: Vipin Sharma <vipinsh@google.com> Reviewed-by: David Matlack <dmatlack@google.com> Tested-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20260505212838.1698034-4-rananta@google.com Signed-off-by: Alex Williamson <alex@shazbot.org>
13 lines
496 B
C
13 lines
496 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef SELFTESTS_VFIO_LIB_INCLUDE_LIBVFIO_SYSFS_H
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#define SELFTESTS_VFIO_LIB_INCLUDE_LIBVFIO_SYSFS_H
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int sysfs_sriov_totalvfs_get(const char *bdf);
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int sysfs_sriov_numvfs_get(const char *bdf);
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void sysfs_sriov_numvfs_set(const char *bdf, int numvfs);
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char *sysfs_sriov_vf_bdf_get(const char *pf_bdf, int i);
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int sysfs_iommu_group_get(const char *bdf);
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char *sysfs_driver_get(const char *bdf);
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#endif /* SELFTESTS_VFIO_LIB_INCLUDE_LIBVFIO_SYSFS_H */
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