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PCI: Add support for relative addressing in quirk tables

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Allow the PCI quirk tables to be emitted in a way that avoids absolute
references to the hook functions. This reduces the size of the entries,
and, more importantly, makes them invariant under runtime relocation
(e.g., for KASLR)

Link: http://lkml.kernel.org/r/[email protected]
Acked-by: Bjorn Helgaas <[email protected]>
Acked-by: Michael Ellerman <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: James Morris <[email protected]>
Cc: James Morris <[email protected]>
Cc: Jessica Yu <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Nicolas Pitre <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Russell King <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Garnier <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ard Biesheuvel 2018-08-21 21:56:18 -07:00 • committed by Linus Torvalds
commit c9d8b55fa0
2 changed files with 29 additions and 3 deletions
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12
drivers/pci/quirks.c
View file

@ -66,9 +66,15 @@ static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
f->vendor == (u16) PCI_ANY_ID) &&
(f->device == dev->device ||
f->device == (u16) PCI_ANY_ID)) {
calltime = fixup_debug_start(dev, f->hook);
f->hook(dev);
fixup_debug_report(dev, calltime, f->hook);
void (*hook)(struct pci_dev *dev);
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
hook = offset_to_ptr(&f->hook_offset);
#else
hook = f->hook;
#endif
calltime = fixup_debug_start(dev, hook);
hook(dev);
fixup_debug_report(dev, calltime, hook);
}
}