diff options
| author | Dmitry Osipenko <digetx@gmail.com> | 2018-12-12 21:38:48 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-01-16 13:54:09 +0100 |
| commit | 2fc0ac180d0f160cdd5fc69407ca7eb47b3eff99 (patch) | |
| tree | 2dcb9cde64712c9cbfe08e1493c19108ea35d6f1 | |
| parent | iommu: Introduce iotlb_sync_map callback (diff) | |
| download | linux-2fc0ac180d0f160cdd5fc69407ca7eb47b3eff99.tar.xz linux-2fc0ac180d0f160cdd5fc69407ca7eb47b3eff99.zip | |
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>
| -rw-r--r-- | drivers/iommu/tegra-gart.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c index 37a76388ff7e..835fea461c59 100644 --- a/drivers/iommu/tegra-gart.c +++ b/drivers/iommu/tegra-gart.c @@ -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) |