linux-kernel - [PATCH v15 6/6] iommu: Remove mode argument from iommu_set_dma

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Date:   Mon, 12 Jul 2021 19:12:20 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>, <dwmw2@...radead.org>,
        <baolu.lu@...ux.intel.com>, <robin.murphy@....com>,
        <corbet@....net>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <linuxarm@...wei.com>, <thunder.leizhen@...wei.com>,
        <chenxiang66@...ilicon.com>, <linux-doc@...r.kernel.org>,
        <dianders@...omium.org>, John Garry <john.garry@...wei.com>
Subject: [PATCH v15 6/6] iommu: Remove mode argument from iommu_set_dma_strict()

We only ever now set strict mode enabled in iommu_set_dma_strict(), so
just remove the argument.

Signed-off-by: John Garry <john.garry@...wei.com>
Reviewed-by: Robin Murphy <robin.murphy@....com>
Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/amd/init.c    | 2 +-
 drivers/iommu/intel/iommu.c | 6 +++---
 drivers/iommu/iommu.c       | 5 ++---
 include/linux/iommu.h       | 2 +-
 4 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 1e641cb6dddc..6e12a615117b 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -3099,7 +3099,7 @@ static int __init parse_amd_iommu_options(char *str)
 	for (; *str; ++str) {
 		if (strncmp(str, "fullflush", 9) == 0) {
 			pr_warn("amd_iommu=fullflush deprecated; use iommu.strict=1 instead\n");
-			iommu_set_dma_strict(true);
+			iommu_set_dma_strict();
 		}
 		if (strncmp(str, "force_enable", 12) == 0)
 			amd_iommu_force_enable = true;
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d06e8f71c259..6666089c2607 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -454,7 +454,7 @@ static int __init intel_iommu_setup(char *str)
 			iommu_dma_forcedac = true;
 		} else if (!strncmp(str, "strict", 6)) {
 			pr_warn("intel_iommu=strict deprecated; use iommu.strict=1 instead\n");
-			iommu_set_dma_strict(true);
+			iommu_set_dma_strict();
 		} else if (!strncmp(str, "sp_off", 6)) {
 			pr_info("Disable supported super page\n");
 			intel_iommu_superpage = 0;
@@ -4382,7 +4382,7 @@ int __init intel_iommu_init(void)
 		 */
 		if (cap_caching_mode(iommu->cap)) {
 			pr_info_once("IOMMU batching disallowed due to virtualization\n");
-			iommu_set_dma_strict(true);
+			iommu_set_dma_strict();
 		}
 		iommu_device_sysfs_add(&iommu->iommu, NULL,
 				       intel_iommu_groups,
@@ -5700,7 +5700,7 @@ static void quirk_calpella_no_shadow_gtt(struct pci_dev *dev)
 	} else if (dmar_map_gfx) {
 		/* we have to ensure the gfx device is idle before we flush */
 		pci_info(dev, "Disabling batched IOTLB flush on Ironlake\n");
-		iommu_set_dma_strict(true);
+		iommu_set_dma_strict();
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0040, quirk_calpella_no_shadow_gtt);
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 60b1ec42e73b..ff221d3ddcbc 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -349,10 +349,9 @@ static int __init iommu_dma_setup(char *str)
 }
 early_param("iommu.strict", iommu_dma_setup);
 
-void iommu_set_dma_strict(bool strict)
+void iommu_set_dma_strict(void)
 {
-	if (strict || !(iommu_cmd_line & IOMMU_CMD_LINE_STRICT))
-		iommu_dma_strict = strict;
+	iommu_dma_strict = true;
 }
 
 bool iommu_get_dma_strict(struct iommu_domain *domain)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 32d448050bf7..754f67d6dd90 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -476,7 +476,7 @@ int iommu_enable_nesting(struct iommu_domain *domain);
 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
 		unsigned long quirks);
 
-void iommu_set_dma_strict(bool val);
+void iommu_set_dma_strict(void);
 bool iommu_get_dma_strict(struct iommu_domain *domain);
 
 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
-- 
2.26.2