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[91.79.165.221]) by smtp.gmail.com with ESMTPSA id c20sm1708346lfj.67.2018.12.09.12.31.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 09 Dec 2018 12:31:02 -0800 (PST) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Joerg Roedel Cc: Robin Murphy , iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 05/21] iommu/tegra: gart: Optimize mapping / unmapping performance Date: Sun, 9 Dec 2018 23:29:34 +0300 Message-Id: <20181209202950.31486-6-digetx@gmail.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181209202950.31486-1-digetx@gmail.com> References: <20181209202950.31486-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Acked-by: Thierry Reding --- drivers/iommu/tegra-gart.c | 12 ++++++++++-- 1 file 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) -- 2.19.1