kernel/0027-fix-IOMMU-Add-ARCH_HAS_TEARDOWN_DMA_OPS.patch

From 578706c396c4d103836c7f993e79f93242967425 Mon Sep 17 00:00:00 2001
From: linmin <linmin@eswincomputing.com>
Date: Mon, 29 Apr 2024 08:59:44 +0800
Subject: [PATCH 027/219] fix(IOMMU):Add ARCH_HAS_TEARDOWN_DMA_OPS

Changelogs:
1.Added "select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT"
  in drivers/soc/sifive/Kconfig
2.Added arch_teardown_dma_ops() function in arch/riscv/mm/dma-noncoherent.c
---
 arch/riscv/mm/dma-noncoherent.c | 7 +++++++
 drivers/soc/sifive/Kconfig      | 1 +
 2 files changed, 8 insertions(+)

diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c
index 75d3f1e6f884..ba27d4765fb7 100644
--- a/arch/riscv/mm/dma-noncoherent.c
+++ b/arch/riscv/mm/dma-noncoherent.c
@@ -138,6 +138,13 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
 	ALT_CMO_OP(flush, flush_addr, size, riscv_cbom_block_size);
 }
 
+#ifdef CONFIG_IOMMU_DMA
+void arch_teardown_dma_ops(struct device *dev)
+{
+	dev->dma_ops = NULL;
+}
+#endif
+
 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 		const struct iommu_ops *iommu, bool coherent)
 {
diff --git a/drivers/soc/sifive/Kconfig b/drivers/soc/sifive/Kconfig
index d78b8c3f72a8..f10259ca60ae 100644
--- a/drivers/soc/sifive/Kconfig
+++ b/drivers/soc/sifive/Kconfig
@@ -20,6 +20,7 @@ config ARCH_ESWIN_EIC770X_SOC_FAMILY
 	select ESWIN_RSV_MEMBLOCK
 	select ESWIN_CODACACHE_CONTROLLER
 	select IOMMU_DMA if IOMMU_SUPPORT
+	select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
 
 menu "ESWIN EIC770X SoC Family Selection"
 	depends on ARCH_ESWIN_EIC770X_SOC_FAMILY
-- 
2.47.0