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iommu/tegra: gart: Optimize mapping / unmapping performance 

Currently GART writes one page entry at a time. More optimal would be to
aggregate the writes and flush BUS buffer in the end, this gives map/unmap
10-40% performance boost (depending on size of mapping) in comparison to
flushing after each page entry update.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
hifive-unleashed-5.1
Dmitry Osipenko 2018-12-12 23:38:48 +03:00 committed by Joerg Roedel
parent 1d7ae53b15
commit 2fc0ac180d
1 changed files with 10 additions and 2 deletions
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12
drivers/iommu/tegra-gart.c
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@ -290,7 +290,6 @@ static int gart_iommu_map(struct iommu_domain *domain, unsigned long iova,
}
}
gart_set_pte(gart, iova, GART_PTE(pfn));
FLUSH_GART_REGS(gart);
spin_unlock_irqrestore(&gart->pte_lock, flags);
return 0;
}
@ -307,7 +306,6 @@ static size_t gart_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
spin_lock_irqsave(&gart->pte_lock, flags);
gart_set_pte(gart, iova, 0);
FLUSH_GART_REGS(gart);
spin_unlock_irqrestore(&gart->pte_lock, flags);
return bytes;
}
@ -373,6 +371,14 @@ static int gart_iommu_of_xlate(struct device *dev,
return 0;
}
static void gart_iommu_sync(struct iommu_domain *domain)
{
struct gart_domain *gart_domain = to_gart_domain(domain);
struct gart_device *gart = gart_domain->gart;
FLUSH_GART_REGS(gart);
}
static const struct iommu_ops gart_iommu_ops = {
.capable = gart_iommu_capable,
.domain_alloc = gart_iommu_domain_alloc,
@ -387,6 +393,8 @@ static const struct iommu_ops gart_iommu_ops = {
.iova_to_phys = gart_iommu_iova_to_phys,
.pgsize_bitmap = GART_IOMMU_PGSIZES,
.of_xlate = gart_iommu_of_xlate,
.iotlb_sync_map = gart_iommu_sync,
.iotlb_sync = gart_iommu_sync,
};
static int tegra_gart_suspend(struct device *dev)