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iommu/arm-smmu: fix pud/pmd entry fill sequence 

The ARM SMMU driver's population of puds and pmds is broken, since we
iterate over the next level of table repeatedly setting the current
level descriptor to point at the pmd being initialised. This is clearly
wrong when dealing with multiple pmds/puds.

This patch fixes the problem by moving the pud/pmd population out of the
loop and instead performing it when we allocate the next level (like we
correctly do for ptes already). The starting address for the next level
is then calculated prior to entering the loop.

Cc: <stable@vger.kernel.org>
Signed-off-by: Yifan Zhang <zhangyf@marvell.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Yifan Zhang 2014-01-03 12:01:26 +00:00 committed by Will Deacon
parent b28a960c42
commit 97a644208d
1 changed files with 10 additions and 4 deletions
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14
drivers/iommu/arm-smmu.c
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@ -1320,6 +1320,11 @@ static int arm_smmu_alloc_init_pmd(struct arm_smmu_device *smmu, pud_t *pud,
pmd = pmd_alloc_one(NULL, addr);
if (!pmd)
return -ENOMEM;
pud_populate(NULL, pud, pmd);
arm_smmu_flush_pgtable(smmu, pud, sizeof(*pud));
pmd += pmd_index(addr);
} else
#endif
pmd = pmd_offset(pud, addr);
@ -1328,8 +1333,6 @@ static int arm_smmu_alloc_init_pmd(struct arm_smmu_device *smmu, pud_t *pud,
next = pmd_addr_end(addr, end);
ret = arm_smmu_alloc_init_pte(smmu, pmd, addr, end, pfn,
flags, stage);
pud_populate(NULL, pud, pmd);
arm_smmu_flush_pgtable(smmu, pud, sizeof(*pud));
phys += next - addr;
} while (pmd++, addr = next, addr < end);
@ -1349,6 +1352,11 @@ static int arm_smmu_alloc_init_pud(struct arm_smmu_device *smmu, pgd_t *pgd,
pud = pud_alloc_one(NULL, addr);
if (!pud)
return -ENOMEM;
pgd_populate(NULL, pgd, pud);
arm_smmu_flush_pgtable(smmu, pgd, sizeof(*pgd));
pud += pud_index(addr);
} else
#endif
pud = pud_offset(pgd, addr);
@ -1357,8 +1365,6 @@ static int arm_smmu_alloc_init_pud(struct arm_smmu_device *smmu, pgd_t *pgd,
next = pud_addr_end(addr, end);
ret = arm_smmu_alloc_init_pmd(smmu, pud, addr, next, phys,
flags, stage);
pgd_populate(NULL, pud, pgd);
arm_smmu_flush_pgtable(smmu, pgd, sizeof(*pgd));
phys += next - addr;
} while (pud++, addr = next, addr < end);