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iommu/exynos: Don't open-code loop unrolling 

IOMMU domain allocation is not performance critical operation, so remove
hand made optimisation of unrolled initialization loop and leave this to
the compiler.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Marek Szyprowski 2017-03-24 10:18:44 +01:00 committed by Joerg Roedel
parent 97da3854c5
commit e75276638c
1 changed files with 2 additions and 10 deletions
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12
drivers/iommu/exynos-iommu.c
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@ -741,16 +741,8 @@ static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type)
goto err_counter;
/* Workaround for System MMU v3.3 to prevent caching 1MiB mapping */
for (i = 0; i < NUM_LV1ENTRIES; i += 8) {
domain->pgtable[i + 0] = ZERO_LV2LINK;
domain->pgtable[i + 1] = ZERO_LV2LINK;
domain->pgtable[i + 2] = ZERO_LV2LINK;
domain->pgtable[i + 3] = ZERO_LV2LINK;
domain->pgtable[i + 4] = ZERO_LV2LINK;
domain->pgtable[i + 5] = ZERO_LV2LINK;
domain->pgtable[i + 6] = ZERO_LV2LINK;
domain->pgtable[i + 7] = ZERO_LV2LINK;
}
for (i = 0; i < NUM_LV1ENTRIES; i++)
domain->pgtable[i] = ZERO_LV2LINK;
handle = dma_map_single(dma_dev, domain->pgtable, LV1TABLE_SIZE,
DMA_TO_DEVICE);