linux-kernel - [PATCH 1/5] iommu/vt-d: Refactor Kconfig a bit

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Date:   Tue, 20 Jul 2021 09:38:52 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        Sanjay Kumar <sanjay.k.kumar@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Liu Yi L <yi.l.liu@...el.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 1/5] iommu/vt-d: Refactor Kconfig a bit

Put all sub-options inside a "if INTEL_IOMMU" so that they don't need to
always depend on INTEL_IOMMU. Use IS_ENABLED() instead of #ifdef as well.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.c | 13 ++-----------
 drivers/iommu/intel/Kconfig | 18 ++++++++++--------
 2 files changed, 12 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 8c116fe071a2..0440a1850b63 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -327,17 +327,8 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
 static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
 					    dma_addr_t iova);
 
-#ifdef CONFIG_INTEL_IOMMU_DEFAULT_ON
-int dmar_disabled = 0;
-#else
-int dmar_disabled = 1;
-#endif /* CONFIG_INTEL_IOMMU_DEFAULT_ON */
-
-#ifdef CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
-int intel_iommu_sm = 1;
-#else
-int intel_iommu_sm;
-#endif /* CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON */
+int dmar_disabled = !IS_ENABLED(CONFIG_INTEL_IOMMU_DEFAULT_ON);
+int intel_iommu_sm = IS_ENABLED(CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON);
 
 int intel_iommu_enabled = 0;
 EXPORT_SYMBOL_GPL(intel_iommu_enabled);
diff --git a/drivers/iommu/intel/Kconfig b/drivers/iommu/intel/Kconfig
index 43ebd8af11c5..c1a92c3049d0 100644
--- a/drivers/iommu/intel/Kconfig
+++ b/drivers/iommu/intel/Kconfig
@@ -25,9 +25,11 @@ config INTEL_IOMMU
 	  and include PCI device scope covered by these DMA
 	  remapping devices.
 
+if INTEL_IOMMU
+
 config INTEL_IOMMU_DEBUGFS
 	bool "Export Intel IOMMU internals in Debugfs"
-	depends on INTEL_IOMMU && IOMMU_DEBUGFS
+	depends on IOMMU_DEBUGFS
 	select DMAR_PERF
 	help
 	  !!!WARNING!!!
@@ -41,7 +43,7 @@ config INTEL_IOMMU_DEBUGFS
 
 config INTEL_IOMMU_SVM
 	bool "Support for Shared Virtual Memory with Intel IOMMU"
-	depends on INTEL_IOMMU && X86_64
+	depends on X86_64
 	select PCI_PASID
 	select PCI_PRI
 	select MMU_NOTIFIER
@@ -53,9 +55,8 @@ config INTEL_IOMMU_SVM
 	  means of a Process Address Space ID (PASID).
 
 config INTEL_IOMMU_DEFAULT_ON
-	def_bool y
-	prompt "Enable Intel DMA Remapping Devices by default"
-	depends on INTEL_IOMMU
+	bool "Enable Intel DMA Remapping Devices by default"
+	default y
 	help
 	  Selecting this option will enable a DMAR device at boot time if
 	  one is found. If this option is not selected, DMAR support can
@@ -63,7 +64,7 @@ config INTEL_IOMMU_DEFAULT_ON
 
 config INTEL_IOMMU_BROKEN_GFX_WA
 	bool "Workaround broken graphics drivers (going away soon)"
-	depends on INTEL_IOMMU && BROKEN && X86
+	depends on BROKEN && X86
 	help
 	  Current Graphics drivers tend to use physical address
 	  for DMA and avoid using DMA APIs. Setting this config
@@ -74,7 +75,7 @@ config INTEL_IOMMU_BROKEN_GFX_WA
 
 config INTEL_IOMMU_FLOPPY_WA
 	def_bool y
-	depends on INTEL_IOMMU && X86
+	depends on X86
 	help
 	  Floppy disk drivers are known to bypass DMA API calls
 	  thereby failing to work when IOMMU is enabled. This
@@ -83,7 +84,6 @@ config INTEL_IOMMU_FLOPPY_WA
 
 config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
 	bool "Enable Intel IOMMU scalable mode by default"
-	depends on INTEL_IOMMU
 	help
 	  Selecting this option will enable by default the scalable mode if
 	  hardware presents the capability. The scalable mode is defined in
@@ -92,3 +92,5 @@ config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
 	  is not selected, scalable mode support could also be enabled by
 	  passing intel_iommu=sm_on to the kernel. If not sure, please use
 	  the default value.
+
+endif # INTEL_IOMMU
-- 
2.25.1