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ANDROID: Revert "iommu: Remove unused IOMMU_SYS_CACHE_ONLY flag"

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There are out of tree drivers which need IOMMU_SYS_CACHE_ONLY
to be able to cache their data buffers in the system cache,
so restore it.

Bug: 176778547
Change-Id: Ic632a6f5951f9917e6006088b065fdbaf4e1b374
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Isaac J. Manjarres
2021-01-04 16:14:37 -08:00
committed by Suren Baghdasaryan
parent 1b4aca7d82
commit d015c62003
2 changed files with 9 additions and 0 deletions
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3
drivers/iommu/io-pgtable-arm.c
View File

@@ -415,6 +415,9 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
else if (prot & IOMMU_CACHE)
pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
else if (prot & IOMMU_SYS_CACHE_ONLY)
pte |= (ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE
<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
}
if (prot & IOMMU_CACHE)

6
include/linux/iommu.h
View File

@@ -31,6 +31,12 @@
* if the IOMMU page table format is equivalent.
*/
#define IOMMU_PRIV (1 << 5)
/*
* Non-coherent masters can use this page protection flag to set cacheable
* memory attributes for only a transparent outer level of cache, also known as
* the last-level or system cache.
*/
#define IOMMU_SYS_CACHE_ONLY (1 << 6)
struct iommu_ops;
struct iommu_group;