2024-10-23 12:12:30 +03:00
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From: Ben Hutchings <ben@decadent.org.uk>
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Date: Wed, 21 Aug 2019 00:32:16 +0100
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Subject: intel-iommu: Add Kconfig option to exclude iGPU by default
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Bug-Debian: https://bugs.debian.org/935270
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Bug-Kali: https://bugs.kali.org/view.php?id=5644
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There is still laptop firmware that touches the integrated GPU behind
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the operating system's back, and doesn't say so in the RMRR table.
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Enabling the IOMMU for all devices causes breakage.
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Replace CONFIG_INTEL_IOMMU_DEFAULT_ON with a 3-way choice
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corresponding to "on", "off", and "on,intgpu_off".
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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--- a/drivers/iommu/intel/Kconfig
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+++ b/drivers/iommu/intel/Kconfig
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@@ -57,13 +57,24 @@ config INTEL_IOMMU_SVM
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to access DMA resources through process address space by
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means of a Process Address Space ID (PASID).
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-config INTEL_IOMMU_DEFAULT_ON
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- bool "Enable Intel DMA Remapping Devices by default"
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- default y
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+choice
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+ prompt "Default state of Intel DMA Remapping Devices"
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+ default INTEL_IOMMU_DEFAULT_ON
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help
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- Selecting this option will enable a DMAR device at boot time if
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- one is found. If this option is not selected, DMAR support can
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- be enabled by passing intel_iommu=on to the kernel.
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+ Choose whether Intel DMA Remapping Devices should be enabled
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+ by default. This can be overridden at boot time using the
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+ intel_iommu= kernel parameter.
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+
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+config INTEL_IOMMU_DEFAULT_ON
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+ bool "Enable"
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+
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+config INTEL_IOMMU_DEFAULT_ON_INTGPU_OFF
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+ bool "Enable, excluding integrated GPU"
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+
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+config INTEL_IOMMU_DEFAULT_OFF
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+ bool "Disable"
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+
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+endchoice
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config INTEL_IOMMU_FLOPPY_WA
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def_bool y
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--- a/drivers/iommu/intel/iommu.c
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+++ b/drivers/iommu/intel/iommu.c
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2024-10-29 05:12:06 +03:00
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@@ -214,13 +214,13 @@ static LIST_HEAD(dmar_satc_units);
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2024-10-23 12:12:30 +03:00
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static void intel_iommu_domain_free(struct iommu_domain *domain);
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-int dmar_disabled = !IS_ENABLED(CONFIG_INTEL_IOMMU_DEFAULT_ON);
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+int dmar_disabled = IS_ENABLED(CONFIG_INTEL_IOMMU_DEFAULT_OFF);
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int intel_iommu_sm = IS_ENABLED(CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON);
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int intel_iommu_enabled = 0;
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EXPORT_SYMBOL_GPL(intel_iommu_enabled);
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-static int dmar_map_intgpu = 1;
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+static int dmar_map_intgpu = IS_ENABLED(CONFIG_INTEL_IOMMU_DEFAULT_ON);
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static int intel_iommu_superpage = 1;
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static int iommu_identity_mapping;
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static int iommu_skip_te_disable;
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2024-10-29 05:12:06 +03:00
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@@ -259,6 +259,7 @@ static int __init intel_iommu_setup(char
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2024-10-23 12:12:30 +03:00
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while (*str) {
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if (!strncmp(str, "on", 2)) {
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dmar_disabled = 0;
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+ dmar_map_intgpu = 1;
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pr_info("IOMMU enabled\n");
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} else if (!strncmp(str, "off", 3)) {
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dmar_disabled = 1;
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