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557dbdf6c4
Update vfio_pci_bar_map() to align BAR mmaps for efficient huge page mappings. The manual mmap alignment can be removed once mmap(!MAP_FIXED) on vfio device fds improves to automatically return well-aligned addresses. Also add MADV_HUGEPAGE, which encourages the kernel to use huge pages (e.g. when /sys/kernel/mm/transparent_hugepage/enabled is set to "madvise"). Drop MAP_FILE from mmap(). It is an ignored compatibility flag. Signed-off-by: Alex Mastro <amastro@fb.com> Reviewed-by: David Matlack <dmatlack@google.com> Tested-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20260114-map-mmio-test-v3-2-44e036d95e64@fb.com Signed-off-by: Alex Williamson <alex@shazbot.org>
36 lines
1.1 KiB
C
36 lines
1.1 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/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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