[PATCH v3 10/33] iommu/mediatek: Add tlb_lock in tlb_flush_all
From: Yong Wu <yong.wu@mediatek.com>
Date: 2021-09-23 12:00:59
Also in:
linux-arm-kernel, linux-iommu, linux-mediatek, lkml
Subsystem:
iommu subsystem, mediatek iommu driver, the rest · Maintainers:
Joerg Roedel, Will Deacon, Yong Wu, Linus Torvalds
The tlb_flush_all also touches the registers about tlb operations. Add spinlock in it to protect the tlb registers. since the tlb_range already hold the spinlock, move it a bit outside the spinlock to print log. Signed-off-by: Yong Wu <yong.wu@mediatek.com> --- drivers/iommu/mtk_iommu.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 0b4c30baa864..ab484d20b441 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c@@ -204,15 +204,24 @@ static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom) return container_of(dom, struct mtk_iommu_domain, domain); } -static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data) +static void mtk_iommu_tlb_do_flush_all(struct mtk_iommu_data *data) { - if (pm_runtime_get_if_in_use(data->dev) <= 0) - return; + unsigned long flags; + spin_lock_irqsave(&data->tlb_lock, flags); writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, data->base + data->plat_data->inv_sel_reg); writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE); wmb(); /* Make sure the tlb flush all done */ + spin_unlock_irqrestore(&data->tlb_lock, flags); +} + +static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data) +{ + if (pm_runtime_get_if_in_use(data->dev) <= 0) + return; + + mtk_iommu_tlb_do_flush_all(data); pm_runtime_put(data->dev); }
@@ -247,14 +256,16 @@ static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size, /* tlb sync */ ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE, tmp, tmp != 0, 10, 1000); + + /* Clear the CPE status */ + writel_relaxed(0, data->base + REG_MMU_CPE_DONE); + spin_unlock_irqrestore(&data->tlb_lock, flags); + if (ret) { dev_warn(data->dev, "Partial TLB flush timed out, falling back to full flush\n"); - mtk_iommu_tlb_flush_all(data); + mtk_iommu_tlb_do_flush_all(data); } - /* Clear the CPE status */ - writel_relaxed(0, data->base + REG_MMU_CPE_DONE); - spin_unlock_irqrestore(&data->tlb_lock, flags); if (has_pm) pm_runtime_put(data->dev);
--
2.18.0