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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>
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef SELFTESTS_VFIO_LIB_INCLUDE_LIBVFIO_H
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#define SELFTESTS_VFIO_LIB_INCLUDE_LIBVFIO_H
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#include <libvfio/assert.h>
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#include <libvfio/iommu.h>
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#include <libvfio/iova_allocator.h>
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#include <libvfio/sysfs.h>
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#include <libvfio/vfio_pci_device.h>
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#include <libvfio/vfio_pci_driver.h>
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/*
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* Return the BDF string of the device that the test should use.
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*
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* If a BDF string is provided by the user on the command line (as the last
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* element of argv[]), then this function will return that and decrement argc
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* by 1.
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*
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* Otherwise this function will attempt to use the environment variable
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* $VFIO_SELFTESTS_BDF.
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*
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* If BDF cannot be determined then the test will exit with KSFT_SKIP.
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*/
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const char *vfio_selftests_get_bdf(int *argc, char *argv[]);
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char **vfio_selftests_get_bdfs(int *argc, char *argv[], int *nr_bdfs);
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/*
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* Reserve virtual address space of size at an address satisfying
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* (vaddr % align) == offset.
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*
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* Returns the reserved vaddr. The caller is responsible for unmapping
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* the returned region.
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*/
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void *mmap_reserve(size_t size, size_t align, size_t offset);
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#endif /* SELFTESTS_VFIO_LIB_INCLUDE_LIBVFIO_H */
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