linux-kernel - [PATCH] iommu: fix compilation without CONFIG_IOMMU

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Date: Thu,  7 Mar 2024 20:44:19 +0100
From: Bert Karwatzki <spasswolf@....de>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Bert Karwatzki <spasswolf@....de>,
	haifeng.zhao@...ux.intel.com,
	iommu@...ts.linux.dev,
	jgg@...pe.ca,
	jiaqing.huang@...el.com,
	joro@...tes.org,
	kevin.tian@...el.com,
	linux-kernel@...r.kernel.org,
	robin.murphy@....com,
	will@...nel.org
Subject: [PATCH] iommu: fix compilation without CONFIG_IOMMU_INTEL

When the kernel is comiled with CONFIG_IRQ_REMAP=y but without
CONFIG_IOMMU_INTEL compilation fails since commit def054b01a8678 with an
undefined reference to device_rbtree_find(). This patch makes sure that
intel specific code is only compiled with CONFIG_IOMMU_INTEL=y.

Fixes: def054b01a8678 ("iommu/vt-d: Use device rbtree in iopf reporting path")

Signed-off-by: Bert Karwatzki <spasswolf@....de>
---
 drivers/iommu/Kconfig         | 2 +-
 drivers/iommu/intel/Makefile  | 2 ++
 drivers/iommu/irq_remapping.c | 3 ++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index e0796fa84227..0af39bbbe3a3 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -199,7 +199,7 @@ source "drivers/iommu/iommufd/Kconfig"
 config IRQ_REMAP
 	bool "Support for Interrupt Remapping"
 	depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
-	select DMAR_TABLE
+	select DMAR_TABLE if INTEL_IOMMU
 	help
 	  Supports Interrupt remapping for IO-APIC and MSI devices.
 	  To use x2apic mode in the CPU's which support x2APIC enhancements or
diff --git a/drivers/iommu/intel/Makefile b/drivers/iommu/intel/Makefile
index 5dabf081a779..5402b699a122 100644
--- a/drivers/iommu/intel/Makefile
+++ b/drivers/iommu/intel/Makefile
@@ -5,5 +5,7 @@ obj-$(CONFIG_DMAR_TABLE) += trace.o cap_audit.o
 obj-$(CONFIG_DMAR_PERF) += perf.o
 obj-$(CONFIG_INTEL_IOMMU_DEBUGFS) += debugfs.o
 obj-$(CONFIG_INTEL_IOMMU_SVM) += svm.o
+ifdef CONFIG_INTEL_IOMMU
 obj-$(CONFIG_IRQ_REMAP) += irq_remapping.o
+endif
 obj-$(CONFIG_INTEL_IOMMU_PERF_EVENTS) += perfmon.o
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 83314b9d8f38..ee59647c2050 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -99,7 +99,8 @@ int __init irq_remapping_prepare(void)
 	if (disable_irq_remap)
 		return -ENOSYS;

-	if (intel_irq_remap_ops.prepare() == 0)
+	if (IS_ENABLED(CONFIG_INTEL_IOMMU) &&
+	    intel_irq_remap_ops.prepare() == 0)
 		remap_ops = &intel_irq_remap_ops;
 	else if (IS_ENABLED(CONFIG_AMD_IOMMU) &&
 		 amd_iommu_irq_ops.prepare() == 0)
--
2.39.2

Since commit def054b01a8678 compilation fails on x86_64 without
CONFIG_IOMMU_INTEL=y with an undefined reference to device_rbtree_find()
when linking drivers/iommu/intel/dmar.o. Even though this file is intel
specific it is compile because CONFIG_IRQ_REMAP unconditionally selects
CONFIG_DMAR_TABLE. This patch fixes this by only compiling intel
specific files when CONFIG_IOMMU_INTEL=y.

Bert Karwatzki