linux-kernel - [RFC PATCH v2 04/10] iommu/riscv: add iotlb_sync

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Message-Id: <20240614142156.29420-5-zong.li@sifive.com>
Date: Fri, 14 Jun 2024 22:21:50 +0800
From: Zong Li <zong.li@...ive.com>
To: joro@...tes.org,
	will@...nel.org,
	robin.murphy@....com,
	tjeznach@...osinc.com,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	jgg@...pe.ca,
	kevin.tian@...el.com,
	linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev,
	linux-riscv@...ts.infradead.org
Cc: Zong Li <zong.li@...ive.com>
Subject: [RFC PATCH v2 04/10] iommu/riscv: add iotlb_sync_map operation support

Add iotlb_sync_map operation for flush IOTLB. Software must
flush the IOTLB after each page table.

Signed-off-by: Zong Li <zong.li@...ive.com>
---
 drivers/iommu/riscv/Makefile |  1 +
 drivers/iommu/riscv/iommu.c  | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/iommu/riscv/Makefile b/drivers/iommu/riscv/Makefile
index d36625a1fd08..f02ce6ebfbd0 100644
--- a/drivers/iommu/riscv/Makefile
+++ b/drivers/iommu/riscv/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_RISCV_IOMMU) += iommu.o iommu-platform.o iommu-pmu.o
 obj-$(CONFIG_RISCV_IOMMU_PCI) += iommu-pci.o
+obj-$(CONFIG_SIFIVE_IOMMU) += iommu-sifive.o
diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c
index 9aeb4b20c145..df7aeb2571ae 100644
--- a/drivers/iommu/riscv/iommu.c
+++ b/drivers/iommu/riscv/iommu.c
@@ -1115,6 +1115,16 @@ static void riscv_iommu_iotlb_sync(struct iommu_domain *iommu_domain,
 	riscv_iommu_iotlb_inval(domain, gather->start, gather->end);
 }
 
+static int riscv_iommu_iotlb_sync_map(struct iommu_domain *iommu_domain,
+				      unsigned long iova, size_t size)
+{
+	struct riscv_iommu_domain *domain = iommu_domain_to_riscv(iommu_domain);
+
+	riscv_iommu_iotlb_inval(domain, iova, iova + size - 1);
+
+	return 0;
+}
+
 static inline size_t get_page_size(size_t size)
 {
 	if (size >= IOMMU_PAGE_SIZE_512G)
@@ -1396,6 +1406,7 @@ static const struct iommu_domain_ops riscv_iommu_paging_domain_ops = {
 	.unmap_pages = riscv_iommu_unmap_pages,
 	.iova_to_phys = riscv_iommu_iova_to_phys,
 	.iotlb_sync = riscv_iommu_iotlb_sync,
+	.iotlb_sync_map = riscv_iommu_iotlb_sync_map,
 	.flush_iotlb_all = riscv_iommu_iotlb_flush_all,
 };
 
-- 
2.17.1