arm64: Enforce BBM for huge IO/VMAP mappings

ioremap_page_range doesn't honour break-before-make and attempts to put
down huge mappings (using p*d_set_huge) over the top of pre-existing
table entries. This leads to us leaking page table memory and also gives
rise to TLB conflicts and spurious aborts, which have been seen in
practice on Cortex-A75.

Until this has been resolved, refuse to put block mappings when the
existing entry is found to be present.

Fixes: 324420bf91f60 ("arm64: add support for ioremap() block mappings")
Reported-by: Hanjun Guo <hanjun.guo@linaro.org>
Reported-by: Lei Li <lious.lilei@hisilicon.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 3161b853f29e1d35a21b0da5a01f571c995616f3..84a019f5502293dbe0c28cc078465e4ddd6c2096 100644 (file)
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -933,6 +933,11 @@ int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot)
 {
        pgprot_t sect_prot = __pgprot(PUD_TYPE_SECT |
                                        pgprot_val(mk_sect_prot(prot)));
+
+       /* ioremap_page_range doesn't honour BBM */
+       if (pud_present(READ_ONCE(*pudp)))
+               return 0;
+
        BUG_ON(phys & ~PUD_MASK);
        set_pud(pudp, pfn_pud(__phys_to_pfn(phys), sect_prot));
        return 1;
@@ -942,6 +947,11 @@ int pmd_set_huge(pmd_t *pmdp, phys_addr_t phys, pgprot_t prot)
 {
        pgprot_t sect_prot = __pgprot(PMD_TYPE_SECT |
                                        pgprot_val(mk_sect_prot(prot)));
+
+       /* ioremap_page_range doesn't honour BBM */
+       if (pmd_present(READ_ONCE(*pmdp)))
+               return 0;
+
        BUG_ON(phys & ~PMD_MASK);
        set_pmd(pmdp, pfn_pmd(__phys_to_pfn(phys), sect_prot));
        return 1;