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Mon, 4 Nov 2019 15:02:11 +0800 From: Yong Wu To: Matthias Brugger , Joerg Roedel , Will Deacon Subject: [PATCH v5 6/7] iommu/mediatek: Get rid of the pgtlock Date: Mon, 4 Nov 2019 15:01:07 +0800 Message-ID: <1572850868-22315-7-git-send-email-yong.wu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1572850868-22315-1-git-send-email-yong.wu@mediatek.com> References: <1572850868-22315-1-git-send-email-yong.wu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191103_230220_206017_C7FC8F23 X-CRM114-Status: GOOD ( 12.69 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: youlin.pei@mediatek.com, anan.sun@mediatek.com, Nicolas Boichat , cui.zhang@mediatek.com, srv_heupstream@mediatek.com, chao.hao@mediatek.com, edison.hsieh@mediatek.com, linux-kernel@vger.kernel.org, Evan Green , Tomasz Figa , iommu@lists.linux-foundation.org, linux-mediatek@lists.infradead.org, yong.wu@mediatek.com, Robin Murphy , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Now we have tlb_lock for the HW tlb flush, then pgtable code hasn't needed the external "pgtlock" for a while. this patch remove the "pgtlock". Signed-off-by: Yong Wu --- drivers/iommu/mtk_iommu.c | 25 +++---------------------- 1 file changed, 3 insertions(+), 22 deletions(-) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 0e5f41f..c2b7ed5 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -101,8 +101,6 @@ #define MTK_M4U_TO_PORT(id) ((id) & 0x1f) struct mtk_iommu_domain { - spinlock_t pgtlock; /* lock for page table */ - struct io_pgtable_cfg cfg; struct io_pgtable_ops *iop; @@ -295,8 +293,6 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom) { struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); - spin_lock_init(&dom->pgtlock); - dom->cfg = (struct io_pgtable_cfg) { .quirks = IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_PERMS | @@ -395,18 +391,13 @@ static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova, { struct mtk_iommu_domain *dom = to_mtk_domain(domain); struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); - unsigned long flags; - int ret; /* The "4GB mode" M4U physically can not use the lower remap of Dram. */ if (data->enable_4GB) paddr |= BIT_ULL(32); - spin_lock_irqsave(&dom->pgtlock, flags); - ret = dom->iop->map(dom->iop, iova, paddr, size, prot); - spin_unlock_irqrestore(&dom->pgtlock, flags); - - return ret; + /* Synchronize with the tlb_lock */ + return dom->iop->map(dom->iop, iova, paddr, size, prot); } static size_t mtk_iommu_unmap(struct iommu_domain *domain, @@ -414,14 +405,8 @@ static size_t mtk_iommu_unmap(struct iommu_domain *domain, struct iommu_iotlb_gather *gather) { struct mtk_iommu_domain *dom = to_mtk_domain(domain); - unsigned long flags; - size_t unmapsz; - - spin_lock_irqsave(&dom->pgtlock, flags); - unmapsz = dom->iop->unmap(dom->iop, iova, size, gather); - spin_unlock_irqrestore(&dom->pgtlock, flags); - return unmapsz; + return dom->iop->unmap(dom->iop, iova, size, gather); } static void mtk_iommu_flush_iotlb_all(struct iommu_domain *domain) @@ -447,13 +432,9 @@ static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain, { struct mtk_iommu_domain *dom = to_mtk_domain(domain); struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); - unsigned long flags; phys_addr_t pa; - spin_lock_irqsave(&dom->pgtlock, flags); pa = dom->iop->iova_to_phys(dom->iop, iova); - spin_unlock_irqrestore(&dom->pgtlock, flags); - if (data->enable_4GB && pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE) pa &= ~BIT_ULL(32);