From: Yong Wu <yong.wu@mediatek.com>
To: Matthias Brugger <matthias.bgg@gmail.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will.deacon@arm.com>
Cc: Evan Green <evgreen@chromium.org>,
Robin Murphy <robin.murphy@arm.com>,
Tomasz Figa <tfiga@google.com>,
<linux-mediatek@lists.infradead.org>,
<srv_heupstream@mediatek.com>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<iommu@lists.linux-foundation.org>, <yong.wu@mediatek.com>,
<youlin.pei@mediatek.com>,
Nicolas Boichat <drinkcat@chromium.org>, <anan.sun@mediatek.com>,
<cui.zhang@mediatek.com>, <chao.hao@mediatek.com>,
<edison.hsieh@mediatek.com>
Subject: [PATCH v4 6/7] iommu/mediatek: Get rid of the pgtlock
Date: Wed, 16 Oct 2019 11:33:11 +0800 [thread overview]
Message-ID: <1571196792-12382-7-git-send-email-yong.wu@mediatek.com> (raw)
In-Reply-To: <1571196792-12382-1-git-send-email-yong.wu@mediatek.com>
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 <yong.wu@mediatek.com>
---
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);
--
1.9.1
next prev parent reply other threads:[~2019-10-16 3:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-16 3:33 [PATCH v4 0/7] Improve tlb range flush Yong Wu
2019-10-16 3:33 ` [PATCH v4 1/7] iommu/mediatek: Correct the flush_iotlb_all callback Yong Wu
2019-10-16 3:33 ` [PATCH v4 2/7] iommu/mediatek: Add a new tlb_lock for tlb_flush Yong Wu
2019-10-23 16:52 ` Will Deacon
2019-10-24 7:22 ` Yong Wu
2019-10-16 3:33 ` [PATCH v4 3/7] iommu/mediatek: Use gather to achieve the tlb range flush Yong Wu
2019-10-23 16:55 ` Will Deacon
2019-10-24 7:22 ` Yong Wu
2019-10-16 3:33 ` [PATCH v4 4/7] iommu/mediatek: Delete the leaf in the tlb_flush Yong Wu
2019-10-16 3:33 ` [PATCH v4 5/7] iommu/mediatek: Move the tlb_sync into tlb_flush Yong Wu
2019-10-16 3:33 ` Yong Wu [this message]
2019-10-16 3:33 ` [PATCH v4 7/7] iommu/mediatek: Reduce the tlb flush timeout value Yong Wu
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