diff options
| author | Bjorn Andersson <bjorn.andersson@linaro.org> | 2019-05-16 01:32:34 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2019-06-25 14:26:47 +0200 |
| commit | 9e6ea59f3ff37192fd7aec7821dca6ece629b7d0 (patch) | |
| tree | cafa2dcc9651a7b95f163a255e8a1beb7086c2cf /drivers/iommu | |
| parent | iommu/io-pgtable: Replace IO_PGTABLE_QUIRK_NO_DMA with specific flag (diff) | |
| download | linux-9e6ea59f3ff37192fd7aec7821dca6ece629b7d0.tar.xz linux-9e6ea59f3ff37192fd7aec7821dca6ece629b7d0.zip | |
iommu/io-pgtable: Support non-coherent page tables
Describe the memory related to page table walks as non-cacheable for
iommu instances that are not DMA coherent.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
[will: Use cfg->coherent_walk, fix arm-v7s, ensure outer-shareable for NC]
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/io-pgtable-arm-v7s.c | 7 | ||||
| -rw-r--r-- | drivers/iommu/io-pgtable-arm.c | 12 |
2 files changed, 14 insertions, 5 deletions
diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c index 8454de93e356..35de9ebb500c 100644 --- a/drivers/iommu/io-pgtable-arm-v7s.c +++ b/drivers/iommu/io-pgtable-arm-v7s.c @@ -789,8 +789,11 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg, /* TTBRs */ cfg->arm_v7s_cfg.ttbr[0] = virt_to_phys(data->pgd) | ARM_V7S_TTBR_S | ARM_V7S_TTBR_NOS | - ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_WBWA) | - ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_WBWA); + (cfg->coherent_walk ? + (ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_WBWA) | + ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_WBWA)) : + (ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_NC) | + ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_NC))); cfg->arm_v7s_cfg.ttbr[1] = 0; return &data->iop; diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 91d0a4228b58..b4e624afd1bb 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -806,9 +806,15 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) return NULL; /* TCR */ - reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) | - (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) | - (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT); + if (cfg->coherent_walk) { + reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) | + (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) | + (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT); + } else { + reg = (ARM_LPAE_TCR_SH_OS << ARM_LPAE_TCR_SH0_SHIFT) | + (ARM_LPAE_TCR_RGN_NC << ARM_LPAE_TCR_IRGN0_SHIFT) | + (ARM_LPAE_TCR_RGN_NC << ARM_LPAE_TCR_ORGN0_SHIFT); + } switch (ARM_LPAE_GRANULE(data)) { case SZ_4K: |