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| author | Alexei Starovoitov <ast@kernel.org> | 2024-03-08 20:12:54 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2024-03-11 18:58:10 +0300 |
| commit | d7bca9199a27b8690ae1c71dc11f825154af7234 (patch) | |
| tree | bab755c8891d6e8c5868a571a3270cc98c00b99f /mm | |
| parent | 96b0f5addc7a0d9ed1f4969ca85ed7513cb1ed25 (diff) | |
| download | linux-d7bca9199a27b8690ae1c71dc11f825154af7234.tar.xz | |
mm: Introduce vmap_page_range() to map pages in PCI address space
ioremap_page_range() should be used for ranges within vmalloc range only.
The vmalloc ranges are allocated by get_vm_area(). PCI has "resource"
allocator that manages PCI_IOBASE, IO_SPACE_LIMIT address range, hence
introduce vmap_page_range() to be used exclusively to map pages
in PCI address space.
Fixes: 3e49a866c9dc ("mm: Enforce VM_IOREMAP flag and range in ioremap_page_range.")
Reported-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://lore.kernel.org/bpf/CANiq72ka4rir+RTN2FQoT=Vvprp_Ao-CvoYEkSNqtSY+RZj+AA@mail.gmail.com
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmalloc.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index e5b8c70950bc..1e36322d83d8 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -304,11 +304,24 @@ static int vmap_range_noflush(unsigned long addr, unsigned long end, return err; } +int vmap_page_range(unsigned long addr, unsigned long end, + phys_addr_t phys_addr, pgprot_t prot) +{ + int err; + + err = vmap_range_noflush(addr, end, phys_addr, pgprot_nx(prot), + ioremap_max_page_shift); + flush_cache_vmap(addr, end); + if (!err) + err = kmsan_ioremap_page_range(addr, end, phys_addr, prot, + ioremap_max_page_shift); + return err; +} + int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { struct vm_struct *area; - int err; area = find_vm_area((void *)addr); if (!area || !(area->flags & VM_IOREMAP)) { @@ -322,13 +335,7 @@ int ioremap_page_range(unsigned long addr, unsigned long end, (long)area->addr + get_vm_area_size(area)); return -ERANGE; } - err = vmap_range_noflush(addr, end, phys_addr, pgprot_nx(prot), - ioremap_max_page_shift); - flush_cache_vmap(addr, end); - if (!err) - err = kmsan_ioremap_page_range(addr, end, phys_addr, prot, - ioremap_max_page_shift); - return err; + return vmap_page_range(addr, end, phys_addr, prot); } static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |