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![Linus Torvalds](/assets/img/avatar_default.png)
Including: - New DART IOMMU driver for Apple Silicon M1 chips. - Optimizations for iommu_[map/unmap] performance - Selective TLB flush support for the AMD IOMMU driver to make it more efficient on emulated IOMMUs. - Rework IOVA setup and default domain type setting to move more code out of IOMMU drivers and to support runtime switching between certain types of default domains. - VT-d Updates from Lu Baolu: - Update the virtual command related registers - Enable Intel IOMMU scalable mode by default - Preset A/D bits for user space DMA usage - Allow devices to have more than 32 outstanding PRs - Various cleanups - ARM SMMU Updates from Will Deacon: - SMMUv3: Minor optimisation to avoid zeroing struct members on CMD submission - SMMUv3: Increased use of batched commands to reduce submission latency - SMMUv3: Refactoring in preparation for ECMDQ support - SMMUv2: Fix races when probing devices with identical StreamIDs - SMMUv2: Optimise walk cache flushing for Qualcomm implementations - SMMUv2: Allow deep sleep states for some Qualcomm SoCs with shared clocks - Various smaller optimizations, cleanups, and fixes -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEr9jSbILcajRFYWYyK/BELZcBGuMFAmEyKYAACgkQK/BELZcB GuOzAxAAnJ02PG07BnFFFGN2/o3eVON4LQUXquMePjcZ8A8oQf073jO/ybWNnpJK 5V+DHRg2CAugFHks/EwIrxFXAWZuStrcnk81d8t6T6ROQl47Zv1qshksUTnsDQnz V7mQ1P/pcsBwCUf73aD9ncLmLkiuTVfHKoKfe3gHeQI+H+2Lw4ijzB8kIwUqhkHI heJZLDmO87S2Mr7zlCmMQH5R550fHrTKSbUCx9QqFu3GgWsjkU+3u1S17xR1bEoW hmhJhyAw+MLrSgdeG4U9o+6AcQuRELEHfVSq7PtDxQ6hEVziGYGY4Nk+YiEcXFiv mu9qfEkaP/2QOKszvks+nhHrwDnJ9WLnEEskiEFwjsaFauIKsRscfYVUBTWeYXJT 9t/PVngigWLDhGO0NEPthQvJExvJJs1MQQ72CcA6dd0XdGpN+aRglIUWUJP/nQHd doAx4/1YWnHVkWWUef8NgmVvlHdoXjA7vy4QGL9FYCqV6ImfhAkJYKJ99X6Ovlmk gje/Kx+5wUPT2nXNbTkjalIylyUNpugMY4xD7K06VXjvRMUf2SbYNDQxYJaDDld6 nDt0F0NvEyrj7HO8egwIZbX3MOikhMGHur48yEyCTbm+9oHQffkODq1o4OfuxJh2 nq0G5Plln9CEmhQVwzibcPSNlYPe8AZbbXqQ9DrJFusEpYj+01c= =zVaQ -----END PGP SIGNATURE----- Merge tag 'iommu-updates-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu Pull iommu updates from Joerg Roedel: - New DART IOMMU driver for Apple Silicon M1 chips - Optimizations for iommu_[map/unmap] performance - Selective TLB flush support for the AMD IOMMU driver to make it more efficient on emulated IOMMUs - Rework IOVA setup and default domain type setting to move more code out of IOMMU drivers and to support runtime switching between certain types of default domains - VT-d Updates from Lu Baolu: - Update the virtual command related registers - Enable Intel IOMMU scalable mode by default - Preset A/D bits for user space DMA usage - Allow devices to have more than 32 outstanding PRs - Various cleanups - ARM SMMU Updates from Will Deacon: SMMUv3: - Minor optimisation to avoid zeroing struct members on CMD submission - Increased use of batched commands to reduce submission latency - Refactoring in preparation for ECMDQ support SMMUv2: - Fix races when probing devices with identical StreamIDs - Optimise walk cache flushing for Qualcomm implementations - Allow deep sleep states for some Qualcomm SoCs with shared clocks - Various smaller optimizations, cleanups, and fixes * tag 'iommu-updates-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (85 commits) iommu/io-pgtable: Abstract iommu_iotlb_gather access iommu/arm-smmu: Fix missing unlock on error in arm_smmu_device_group() iommu/vt-d: Add present bit check in pasid entry setup helpers iommu/vt-d: Use pasid_pte_is_present() helper function iommu/vt-d: Drop the kernel doc annotation iommu/vt-d: Allow devices to have more than 32 outstanding PRs iommu/vt-d: Preset A/D bits for user space DMA usage iommu/vt-d: Enable Intel IOMMU scalable mode by default iommu/vt-d: Refactor Kconfig a bit iommu/vt-d: Remove unnecessary oom message iommu/vt-d: Update the virtual command related registers iommu: Allow enabling non-strict mode dynamically iommu: Merge strictness and domain type configs iommu: Only log strictness for DMA domains iommu: Expose DMA domain strictness via sysfs iommu: Express DMA strictness via the domain type iommu/vt-d: Prepare for multiple DMA domain types iommu/arm-smmu: Prepare for multiple DMA domain types iommu/amd: Prepare for multiple DMA domain types iommu: Introduce explicit type for non-strict DMA domains ...
3352 lines
85 KiB
C
3352 lines
85 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <jroedel@suse.de>
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*/
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#define pr_fmt(fmt) "iommu: " fmt
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#include <linux/device.h>
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#include <linux/dma-iommu.h>
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#include <linux/kernel.h>
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#include <linux/bits.h>
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#include <linux/bug.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/iommu.h>
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#include <linux/idr.h>
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#include <linux/notifier.h>
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#include <linux/err.h>
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#include <linux/pci.h>
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#include <linux/bitops.h>
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#include <linux/property.h>
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#include <linux/fsl/mc.h>
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#include <linux/module.h>
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#include <trace/events/iommu.h>
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static struct kset *iommu_group_kset;
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static DEFINE_IDA(iommu_group_ida);
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static unsigned int iommu_def_domain_type __read_mostly;
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static bool iommu_dma_strict __read_mostly = IS_ENABLED(CONFIG_IOMMU_DEFAULT_DMA_STRICT);
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static u32 iommu_cmd_line __read_mostly;
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struct iommu_group {
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struct kobject kobj;
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struct kobject *devices_kobj;
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struct list_head devices;
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struct mutex mutex;
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struct blocking_notifier_head notifier;
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void *iommu_data;
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void (*iommu_data_release)(void *iommu_data);
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char *name;
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int id;
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struct iommu_domain *default_domain;
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struct iommu_domain *domain;
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struct list_head entry;
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};
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struct group_device {
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struct list_head list;
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struct device *dev;
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char *name;
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};
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struct iommu_group_attribute {
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struct attribute attr;
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ssize_t (*show)(struct iommu_group *group, char *buf);
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ssize_t (*store)(struct iommu_group *group,
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const char *buf, size_t count);
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};
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static const char * const iommu_group_resv_type_string[] = {
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[IOMMU_RESV_DIRECT] = "direct",
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[IOMMU_RESV_DIRECT_RELAXABLE] = "direct-relaxable",
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[IOMMU_RESV_RESERVED] = "reserved",
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[IOMMU_RESV_MSI] = "msi",
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[IOMMU_RESV_SW_MSI] = "msi",
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};
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#define IOMMU_CMD_LINE_DMA_API BIT(0)
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#define IOMMU_CMD_LINE_STRICT BIT(1)
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static int iommu_alloc_default_domain(struct iommu_group *group,
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struct device *dev);
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static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
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unsigned type);
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static int __iommu_attach_device(struct iommu_domain *domain,
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struct device *dev);
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static int __iommu_attach_group(struct iommu_domain *domain,
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struct iommu_group *group);
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static void __iommu_detach_group(struct iommu_domain *domain,
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struct iommu_group *group);
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static int iommu_create_device_direct_mappings(struct iommu_group *group,
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struct device *dev);
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static struct iommu_group *iommu_group_get_for_dev(struct device *dev);
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static ssize_t iommu_group_store_type(struct iommu_group *group,
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const char *buf, size_t count);
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#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
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struct iommu_group_attribute iommu_group_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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#define to_iommu_group_attr(_attr) \
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container_of(_attr, struct iommu_group_attribute, attr)
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#define to_iommu_group(_kobj) \
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container_of(_kobj, struct iommu_group, kobj)
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static LIST_HEAD(iommu_device_list);
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static DEFINE_SPINLOCK(iommu_device_lock);
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/*
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* Use a function instead of an array here because the domain-type is a
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* bit-field, so an array would waste memory.
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*/
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static const char *iommu_domain_type_str(unsigned int t)
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{
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switch (t) {
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case IOMMU_DOMAIN_BLOCKED:
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return "Blocked";
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case IOMMU_DOMAIN_IDENTITY:
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return "Passthrough";
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case IOMMU_DOMAIN_UNMANAGED:
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return "Unmanaged";
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case IOMMU_DOMAIN_DMA:
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case IOMMU_DOMAIN_DMA_FQ:
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return "Translated";
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default:
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return "Unknown";
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}
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}
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static int __init iommu_subsys_init(void)
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{
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if (!(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API)) {
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if (IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH))
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iommu_set_default_passthrough(false);
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else
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iommu_set_default_translated(false);
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if (iommu_default_passthrough() && mem_encrypt_active()) {
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pr_info("Memory encryption detected - Disabling default IOMMU Passthrough\n");
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iommu_set_default_translated(false);
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}
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}
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if (!iommu_default_passthrough() && !iommu_dma_strict)
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iommu_def_domain_type = IOMMU_DOMAIN_DMA_FQ;
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pr_info("Default domain type: %s %s\n",
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iommu_domain_type_str(iommu_def_domain_type),
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(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ?
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"(set via kernel command line)" : "");
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if (!iommu_default_passthrough())
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pr_info("DMA domain TLB invalidation policy: %s mode %s\n",
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iommu_dma_strict ? "strict" : "lazy",
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(iommu_cmd_line & IOMMU_CMD_LINE_STRICT) ?
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"(set via kernel command line)" : "");
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return 0;
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}
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subsys_initcall(iommu_subsys_init);
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/**
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* iommu_device_register() - Register an IOMMU hardware instance
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* @iommu: IOMMU handle for the instance
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* @ops: IOMMU ops to associate with the instance
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* @hwdev: (optional) actual instance device, used for fwnode lookup
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*
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* Return: 0 on success, or an error.
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*/
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int iommu_device_register(struct iommu_device *iommu,
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const struct iommu_ops *ops, struct device *hwdev)
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{
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/* We need to be able to take module references appropriately */
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if (WARN_ON(is_module_address((unsigned long)ops) && !ops->owner))
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return -EINVAL;
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iommu->ops = ops;
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if (hwdev)
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iommu->fwnode = hwdev->fwnode;
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spin_lock(&iommu_device_lock);
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list_add_tail(&iommu->list, &iommu_device_list);
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spin_unlock(&iommu_device_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(iommu_device_register);
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void iommu_device_unregister(struct iommu_device *iommu)
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{
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spin_lock(&iommu_device_lock);
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list_del(&iommu->list);
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spin_unlock(&iommu_device_lock);
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}
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EXPORT_SYMBOL_GPL(iommu_device_unregister);
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static struct dev_iommu *dev_iommu_get(struct device *dev)
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{
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struct dev_iommu *param = dev->iommu;
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if (param)
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return param;
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param = kzalloc(sizeof(*param), GFP_KERNEL);
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if (!param)
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return NULL;
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mutex_init(¶m->lock);
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dev->iommu = param;
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return param;
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}
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static void dev_iommu_free(struct device *dev)
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{
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iommu_fwspec_free(dev);
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kfree(dev->iommu);
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dev->iommu = NULL;
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}
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static int __iommu_probe_device(struct device *dev, struct list_head *group_list)
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{
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const struct iommu_ops *ops = dev->bus->iommu_ops;
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struct iommu_device *iommu_dev;
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struct iommu_group *group;
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int ret;
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if (!ops)
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return -ENODEV;
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if (!dev_iommu_get(dev))
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return -ENOMEM;
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if (!try_module_get(ops->owner)) {
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ret = -EINVAL;
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goto err_free;
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}
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iommu_dev = ops->probe_device(dev);
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if (IS_ERR(iommu_dev)) {
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ret = PTR_ERR(iommu_dev);
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goto out_module_put;
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}
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dev->iommu->iommu_dev = iommu_dev;
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group = iommu_group_get_for_dev(dev);
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if (IS_ERR(group)) {
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ret = PTR_ERR(group);
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goto out_release;
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}
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iommu_group_put(group);
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if (group_list && !group->default_domain && list_empty(&group->entry))
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list_add_tail(&group->entry, group_list);
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iommu_device_link(iommu_dev, dev);
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return 0;
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out_release:
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ops->release_device(dev);
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out_module_put:
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module_put(ops->owner);
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err_free:
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dev_iommu_free(dev);
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return ret;
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}
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int iommu_probe_device(struct device *dev)
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{
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const struct iommu_ops *ops = dev->bus->iommu_ops;
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struct iommu_group *group;
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int ret;
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ret = __iommu_probe_device(dev, NULL);
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if (ret)
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goto err_out;
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group = iommu_group_get(dev);
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if (!group) {
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ret = -ENODEV;
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goto err_release;
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}
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/*
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* Try to allocate a default domain - needs support from the
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* IOMMU driver. There are still some drivers which don't
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* support default domains, so the return value is not yet
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* checked.
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*/
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mutex_lock(&group->mutex);
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iommu_alloc_default_domain(group, dev);
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mutex_unlock(&group->mutex);
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if (group->default_domain) {
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ret = __iommu_attach_device(group->default_domain, dev);
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if (ret) {
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iommu_group_put(group);
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goto err_release;
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}
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}
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iommu_create_device_direct_mappings(group, dev);
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iommu_group_put(group);
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if (ops->probe_finalize)
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ops->probe_finalize(dev);
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return 0;
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err_release:
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iommu_release_device(dev);
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err_out:
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return ret;
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}
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void iommu_release_device(struct device *dev)
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{
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const struct iommu_ops *ops = dev->bus->iommu_ops;
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if (!dev->iommu)
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return;
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iommu_device_unlink(dev->iommu->iommu_dev, dev);
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ops->release_device(dev);
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iommu_group_remove_device(dev);
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module_put(ops->owner);
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dev_iommu_free(dev);
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}
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static int __init iommu_set_def_domain_type(char *str)
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{
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bool pt;
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int ret;
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ret = kstrtobool(str, &pt);
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if (ret)
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return ret;
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if (pt)
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iommu_set_default_passthrough(true);
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else
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iommu_set_default_translated(true);
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return 0;
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}
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early_param("iommu.passthrough", iommu_set_def_domain_type);
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static int __init iommu_dma_setup(char *str)
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{
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int ret = kstrtobool(str, &iommu_dma_strict);
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if (!ret)
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iommu_cmd_line |= IOMMU_CMD_LINE_STRICT;
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return ret;
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}
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early_param("iommu.strict", iommu_dma_setup);
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void iommu_set_dma_strict(void)
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{
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iommu_dma_strict = true;
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if (iommu_def_domain_type == IOMMU_DOMAIN_DMA_FQ)
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iommu_def_domain_type = IOMMU_DOMAIN_DMA;
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}
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static ssize_t iommu_group_attr_show(struct kobject *kobj,
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struct attribute *__attr, char *buf)
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{
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struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
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struct iommu_group *group = to_iommu_group(kobj);
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ssize_t ret = -EIO;
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if (attr->show)
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ret = attr->show(group, buf);
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return ret;
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}
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static ssize_t iommu_group_attr_store(struct kobject *kobj,
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struct attribute *__attr,
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const char *buf, size_t count)
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{
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struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
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struct iommu_group *group = to_iommu_group(kobj);
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ssize_t ret = -EIO;
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if (attr->store)
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ret = attr->store(group, buf, count);
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return ret;
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}
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static const struct sysfs_ops iommu_group_sysfs_ops = {
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.show = iommu_group_attr_show,
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.store = iommu_group_attr_store,
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};
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static int iommu_group_create_file(struct iommu_group *group,
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struct iommu_group_attribute *attr)
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{
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return sysfs_create_file(&group->kobj, &attr->attr);
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}
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static void iommu_group_remove_file(struct iommu_group *group,
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struct iommu_group_attribute *attr)
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{
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sysfs_remove_file(&group->kobj, &attr->attr);
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}
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static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
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{
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return sprintf(buf, "%s\n", group->name);
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}
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/**
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* iommu_insert_resv_region - Insert a new region in the
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* list of reserved regions.
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* @new: new region to insert
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* @regions: list of regions
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*
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* Elements are sorted by start address and overlapping segments
|
|
* of the same type are merged.
|
|
*/
|
|
static int iommu_insert_resv_region(struct iommu_resv_region *new,
|
|
struct list_head *regions)
|
|
{
|
|
struct iommu_resv_region *iter, *tmp, *nr, *top;
|
|
LIST_HEAD(stack);
|
|
|
|
nr = iommu_alloc_resv_region(new->start, new->length,
|
|
new->prot, new->type);
|
|
if (!nr)
|
|
return -ENOMEM;
|
|
|
|
/* First add the new element based on start address sorting */
|
|
list_for_each_entry(iter, regions, list) {
|
|
if (nr->start < iter->start ||
|
|
(nr->start == iter->start && nr->type <= iter->type))
|
|
break;
|
|
}
|
|
list_add_tail(&nr->list, &iter->list);
|
|
|
|
/* Merge overlapping segments of type nr->type in @regions, if any */
|
|
list_for_each_entry_safe(iter, tmp, regions, list) {
|
|
phys_addr_t top_end, iter_end = iter->start + iter->length - 1;
|
|
|
|
/* no merge needed on elements of different types than @new */
|
|
if (iter->type != new->type) {
|
|
list_move_tail(&iter->list, &stack);
|
|
continue;
|
|
}
|
|
|
|
/* look for the last stack element of same type as @iter */
|
|
list_for_each_entry_reverse(top, &stack, list)
|
|
if (top->type == iter->type)
|
|
goto check_overlap;
|
|
|
|
list_move_tail(&iter->list, &stack);
|
|
continue;
|
|
|
|
check_overlap:
|
|
top_end = top->start + top->length - 1;
|
|
|
|
if (iter->start > top_end + 1) {
|
|
list_move_tail(&iter->list, &stack);
|
|
} else {
|
|
top->length = max(top_end, iter_end) - top->start + 1;
|
|
list_del(&iter->list);
|
|
kfree(iter);
|
|
}
|
|
}
|
|
list_splice(&stack, regions);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
|
|
struct list_head *group_resv_regions)
|
|
{
|
|
struct iommu_resv_region *entry;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(entry, dev_resv_regions, list) {
|
|
ret = iommu_insert_resv_region(entry, group_resv_regions);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int iommu_get_group_resv_regions(struct iommu_group *group,
|
|
struct list_head *head)
|
|
{
|
|
struct group_device *device;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&group->mutex);
|
|
list_for_each_entry(device, &group->devices, list) {
|
|
struct list_head dev_resv_regions;
|
|
|
|
INIT_LIST_HEAD(&dev_resv_regions);
|
|
iommu_get_resv_regions(device->dev, &dev_resv_regions);
|
|
ret = iommu_insert_device_resv_regions(&dev_resv_regions, head);
|
|
iommu_put_resv_regions(device->dev, &dev_resv_regions);
|
|
if (ret)
|
|
break;
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);
|
|
|
|
static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
|
|
char *buf)
|
|
{
|
|
struct iommu_resv_region *region, *next;
|
|
struct list_head group_resv_regions;
|
|
char *str = buf;
|
|
|
|
INIT_LIST_HEAD(&group_resv_regions);
|
|
iommu_get_group_resv_regions(group, &group_resv_regions);
|
|
|
|
list_for_each_entry_safe(region, next, &group_resv_regions, list) {
|
|
str += sprintf(str, "0x%016llx 0x%016llx %s\n",
|
|
(long long int)region->start,
|
|
(long long int)(region->start +
|
|
region->length - 1),
|
|
iommu_group_resv_type_string[region->type]);
|
|
kfree(region);
|
|
}
|
|
|
|
return (str - buf);
|
|
}
|
|
|
|
static ssize_t iommu_group_show_type(struct iommu_group *group,
|
|
char *buf)
|
|
{
|
|
char *type = "unknown\n";
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (group->default_domain) {
|
|
switch (group->default_domain->type) {
|
|
case IOMMU_DOMAIN_BLOCKED:
|
|
type = "blocked\n";
|
|
break;
|
|
case IOMMU_DOMAIN_IDENTITY:
|
|
type = "identity\n";
|
|
break;
|
|
case IOMMU_DOMAIN_UNMANAGED:
|
|
type = "unmanaged\n";
|
|
break;
|
|
case IOMMU_DOMAIN_DMA:
|
|
type = "DMA\n";
|
|
break;
|
|
case IOMMU_DOMAIN_DMA_FQ:
|
|
type = "DMA-FQ\n";
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
strcpy(buf, type);
|
|
|
|
return strlen(type);
|
|
}
|
|
|
|
static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
|
|
|
|
static IOMMU_GROUP_ATTR(reserved_regions, 0444,
|
|
iommu_group_show_resv_regions, NULL);
|
|
|
|
static IOMMU_GROUP_ATTR(type, 0644, iommu_group_show_type,
|
|
iommu_group_store_type);
|
|
|
|
static void iommu_group_release(struct kobject *kobj)
|
|
{
|
|
struct iommu_group *group = to_iommu_group(kobj);
|
|
|
|
pr_debug("Releasing group %d\n", group->id);
|
|
|
|
if (group->iommu_data_release)
|
|
group->iommu_data_release(group->iommu_data);
|
|
|
|
ida_simple_remove(&iommu_group_ida, group->id);
|
|
|
|
if (group->default_domain)
|
|
iommu_domain_free(group->default_domain);
|
|
|
|
kfree(group->name);
|
|
kfree(group);
|
|
}
|
|
|
|
static struct kobj_type iommu_group_ktype = {
|
|
.sysfs_ops = &iommu_group_sysfs_ops,
|
|
.release = iommu_group_release,
|
|
};
|
|
|
|
/**
|
|
* iommu_group_alloc - Allocate a new group
|
|
*
|
|
* This function is called by an iommu driver to allocate a new iommu
|
|
* group. The iommu group represents the minimum granularity of the iommu.
|
|
* Upon successful return, the caller holds a reference to the supplied
|
|
* group in order to hold the group until devices are added. Use
|
|
* iommu_group_put() to release this extra reference count, allowing the
|
|
* group to be automatically reclaimed once it has no devices or external
|
|
* references.
|
|
*/
|
|
struct iommu_group *iommu_group_alloc(void)
|
|
{
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
group = kzalloc(sizeof(*group), GFP_KERNEL);
|
|
if (!group)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
group->kobj.kset = iommu_group_kset;
|
|
mutex_init(&group->mutex);
|
|
INIT_LIST_HEAD(&group->devices);
|
|
INIT_LIST_HEAD(&group->entry);
|
|
BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
|
|
|
|
ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL);
|
|
if (ret < 0) {
|
|
kfree(group);
|
|
return ERR_PTR(ret);
|
|
}
|
|
group->id = ret;
|
|
|
|
ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
|
|
NULL, "%d", group->id);
|
|
if (ret) {
|
|
ida_simple_remove(&iommu_group_ida, group->id);
|
|
kobject_put(&group->kobj);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
|
|
if (!group->devices_kobj) {
|
|
kobject_put(&group->kobj); /* triggers .release & free */
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* The devices_kobj holds a reference on the group kobject, so
|
|
* as long as that exists so will the group. We can therefore
|
|
* use the devices_kobj for reference counting.
|
|
*/
|
|
kobject_put(&group->kobj);
|
|
|
|
ret = iommu_group_create_file(group,
|
|
&iommu_group_attr_reserved_regions);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
ret = iommu_group_create_file(group, &iommu_group_attr_type);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
pr_debug("Allocated group %d\n", group->id);
|
|
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_alloc);
|
|
|
|
struct iommu_group *iommu_group_get_by_id(int id)
|
|
{
|
|
struct kobject *group_kobj;
|
|
struct iommu_group *group;
|
|
const char *name;
|
|
|
|
if (!iommu_group_kset)
|
|
return NULL;
|
|
|
|
name = kasprintf(GFP_KERNEL, "%d", id);
|
|
if (!name)
|
|
return NULL;
|
|
|
|
group_kobj = kset_find_obj(iommu_group_kset, name);
|
|
kfree(name);
|
|
|
|
if (!group_kobj)
|
|
return NULL;
|
|
|
|
group = container_of(group_kobj, struct iommu_group, kobj);
|
|
BUG_ON(group->id != id);
|
|
|
|
kobject_get(group->devices_kobj);
|
|
kobject_put(&group->kobj);
|
|
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_get_by_id);
|
|
|
|
/**
|
|
* iommu_group_get_iommudata - retrieve iommu_data registered for a group
|
|
* @group: the group
|
|
*
|
|
* iommu drivers can store data in the group for use when doing iommu
|
|
* operations. This function provides a way to retrieve it. Caller
|
|
* should hold a group reference.
|
|
*/
|
|
void *iommu_group_get_iommudata(struct iommu_group *group)
|
|
{
|
|
return group->iommu_data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
|
|
|
|
/**
|
|
* iommu_group_set_iommudata - set iommu_data for a group
|
|
* @group: the group
|
|
* @iommu_data: new data
|
|
* @release: release function for iommu_data
|
|
*
|
|
* iommu drivers can store data in the group for use when doing iommu
|
|
* operations. This function provides a way to set the data after
|
|
* the group has been allocated. Caller should hold a group reference.
|
|
*/
|
|
void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
|
|
void (*release)(void *iommu_data))
|
|
{
|
|
group->iommu_data = iommu_data;
|
|
group->iommu_data_release = release;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
|
|
|
|
/**
|
|
* iommu_group_set_name - set name for a group
|
|
* @group: the group
|
|
* @name: name
|
|
*
|
|
* Allow iommu driver to set a name for a group. When set it will
|
|
* appear in a name attribute file under the group in sysfs.
|
|
*/
|
|
int iommu_group_set_name(struct iommu_group *group, const char *name)
|
|
{
|
|
int ret;
|
|
|
|
if (group->name) {
|
|
iommu_group_remove_file(group, &iommu_group_attr_name);
|
|
kfree(group->name);
|
|
group->name = NULL;
|
|
if (!name)
|
|
return 0;
|
|
}
|
|
|
|
group->name = kstrdup(name, GFP_KERNEL);
|
|
if (!group->name)
|
|
return -ENOMEM;
|
|
|
|
ret = iommu_group_create_file(group, &iommu_group_attr_name);
|
|
if (ret) {
|
|
kfree(group->name);
|
|
group->name = NULL;
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_set_name);
|
|
|
|
static int iommu_create_device_direct_mappings(struct iommu_group *group,
|
|
struct device *dev)
|
|
{
|
|
struct iommu_domain *domain = group->default_domain;
|
|
struct iommu_resv_region *entry;
|
|
struct list_head mappings;
|
|
unsigned long pg_size;
|
|
int ret = 0;
|
|
|
|
if (!domain || !iommu_is_dma_domain(domain))
|
|
return 0;
|
|
|
|
BUG_ON(!domain->pgsize_bitmap);
|
|
|
|
pg_size = 1UL << __ffs(domain->pgsize_bitmap);
|
|
INIT_LIST_HEAD(&mappings);
|
|
|
|
iommu_get_resv_regions(dev, &mappings);
|
|
|
|
/* We need to consider overlapping regions for different devices */
|
|
list_for_each_entry(entry, &mappings, list) {
|
|
dma_addr_t start, end, addr;
|
|
size_t map_size = 0;
|
|
|
|
if (domain->ops->apply_resv_region)
|
|
domain->ops->apply_resv_region(dev, domain, entry);
|
|
|
|
start = ALIGN(entry->start, pg_size);
|
|
end = ALIGN(entry->start + entry->length, pg_size);
|
|
|
|
if (entry->type != IOMMU_RESV_DIRECT &&
|
|
entry->type != IOMMU_RESV_DIRECT_RELAXABLE)
|
|
continue;
|
|
|
|
for (addr = start; addr <= end; addr += pg_size) {
|
|
phys_addr_t phys_addr;
|
|
|
|
if (addr == end)
|
|
goto map_end;
|
|
|
|
phys_addr = iommu_iova_to_phys(domain, addr);
|
|
if (!phys_addr) {
|
|
map_size += pg_size;
|
|
continue;
|
|
}
|
|
|
|
map_end:
|
|
if (map_size) {
|
|
ret = iommu_map(domain, addr - map_size,
|
|
addr - map_size, map_size,
|
|
entry->prot);
|
|
if (ret)
|
|
goto out;
|
|
map_size = 0;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
iommu_flush_iotlb_all(domain);
|
|
|
|
out:
|
|
iommu_put_resv_regions(dev, &mappings);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool iommu_is_attach_deferred(struct iommu_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
if (domain->ops->is_attach_deferred)
|
|
return domain->ops->is_attach_deferred(domain, dev);
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* iommu_group_add_device - add a device to an iommu group
|
|
* @group: the group into which to add the device (reference should be held)
|
|
* @dev: the device
|
|
*
|
|
* This function is called by an iommu driver to add a device into a
|
|
* group. Adding a device increments the group reference count.
|
|
*/
|
|
int iommu_group_add_device(struct iommu_group *group, struct device *dev)
|
|
{
|
|
int ret, i = 0;
|
|
struct group_device *device;
|
|
|
|
device = kzalloc(sizeof(*device), GFP_KERNEL);
|
|
if (!device)
|
|
return -ENOMEM;
|
|
|
|
device->dev = dev;
|
|
|
|
ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
|
|
if (ret)
|
|
goto err_free_device;
|
|
|
|
device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
|
|
rename:
|
|
if (!device->name) {
|
|
ret = -ENOMEM;
|
|
goto err_remove_link;
|
|
}
|
|
|
|
ret = sysfs_create_link_nowarn(group->devices_kobj,
|
|
&dev->kobj, device->name);
|
|
if (ret) {
|
|
if (ret == -EEXIST && i >= 0) {
|
|
/*
|
|
* Account for the slim chance of collision
|
|
* and append an instance to the name.
|
|
*/
|
|
kfree(device->name);
|
|
device->name = kasprintf(GFP_KERNEL, "%s.%d",
|
|
kobject_name(&dev->kobj), i++);
|
|
goto rename;
|
|
}
|
|
goto err_free_name;
|
|
}
|
|
|
|
kobject_get(group->devices_kobj);
|
|
|
|
dev->iommu_group = group;
|
|
|
|
mutex_lock(&group->mutex);
|
|
list_add_tail(&device->list, &group->devices);
|
|
if (group->domain && !iommu_is_attach_deferred(group->domain, dev))
|
|
ret = __iommu_attach_device(group->domain, dev);
|
|
mutex_unlock(&group->mutex);
|
|
if (ret)
|
|
goto err_put_group;
|
|
|
|
/* Notify any listeners about change to group. */
|
|
blocking_notifier_call_chain(&group->notifier,
|
|
IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
|
|
|
|
trace_add_device_to_group(group->id, dev);
|
|
|
|
dev_info(dev, "Adding to iommu group %d\n", group->id);
|
|
|
|
return 0;
|
|
|
|
err_put_group:
|
|
mutex_lock(&group->mutex);
|
|
list_del(&device->list);
|
|
mutex_unlock(&group->mutex);
|
|
dev->iommu_group = NULL;
|
|
kobject_put(group->devices_kobj);
|
|
sysfs_remove_link(group->devices_kobj, device->name);
|
|
err_free_name:
|
|
kfree(device->name);
|
|
err_remove_link:
|
|
sysfs_remove_link(&dev->kobj, "iommu_group");
|
|
err_free_device:
|
|
kfree(device);
|
|
dev_err(dev, "Failed to add to iommu group %d: %d\n", group->id, ret);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_add_device);
|
|
|
|
/**
|
|
* iommu_group_remove_device - remove a device from it's current group
|
|
* @dev: device to be removed
|
|
*
|
|
* This function is called by an iommu driver to remove the device from
|
|
* it's current group. This decrements the iommu group reference count.
|
|
*/
|
|
void iommu_group_remove_device(struct device *dev)
|
|
{
|
|
struct iommu_group *group = dev->iommu_group;
|
|
struct group_device *tmp_device, *device = NULL;
|
|
|
|
if (!group)
|
|
return;
|
|
|
|
dev_info(dev, "Removing from iommu group %d\n", group->id);
|
|
|
|
/* Pre-notify listeners that a device is being removed. */
|
|
blocking_notifier_call_chain(&group->notifier,
|
|
IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
|
|
|
|
mutex_lock(&group->mutex);
|
|
list_for_each_entry(tmp_device, &group->devices, list) {
|
|
if (tmp_device->dev == dev) {
|
|
device = tmp_device;
|
|
list_del(&device->list);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
|
|
if (!device)
|
|
return;
|
|
|
|
sysfs_remove_link(group->devices_kobj, device->name);
|
|
sysfs_remove_link(&dev->kobj, "iommu_group");
|
|
|
|
trace_remove_device_from_group(group->id, dev);
|
|
|
|
kfree(device->name);
|
|
kfree(device);
|
|
dev->iommu_group = NULL;
|
|
kobject_put(group->devices_kobj);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_remove_device);
|
|
|
|
static int iommu_group_device_count(struct iommu_group *group)
|
|
{
|
|
struct group_device *entry;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(entry, &group->devices, list)
|
|
ret++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* iommu_group_for_each_dev - iterate over each device in the group
|
|
* @group: the group
|
|
* @data: caller opaque data to be passed to callback function
|
|
* @fn: caller supplied callback function
|
|
*
|
|
* This function is called by group users to iterate over group devices.
|
|
* Callers should hold a reference count to the group during callback.
|
|
* The group->mutex is held across callbacks, which will block calls to
|
|
* iommu_group_add/remove_device.
|
|
*/
|
|
static int __iommu_group_for_each_dev(struct iommu_group *group, void *data,
|
|
int (*fn)(struct device *, void *))
|
|
{
|
|
struct group_device *device;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(device, &group->devices, list) {
|
|
ret = fn(device->dev, data);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
int iommu_group_for_each_dev(struct iommu_group *group, void *data,
|
|
int (*fn)(struct device *, void *))
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&group->mutex);
|
|
ret = __iommu_group_for_each_dev(group, data, fn);
|
|
mutex_unlock(&group->mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
|
|
|
|
/**
|
|
* iommu_group_get - Return the group for a device and increment reference
|
|
* @dev: get the group that this device belongs to
|
|
*
|
|
* This function is called by iommu drivers and users to get the group
|
|
* for the specified device. If found, the group is returned and the group
|
|
* reference in incremented, else NULL.
|
|
*/
|
|
struct iommu_group *iommu_group_get(struct device *dev)
|
|
{
|
|
struct iommu_group *group = dev->iommu_group;
|
|
|
|
if (group)
|
|
kobject_get(group->devices_kobj);
|
|
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_get);
|
|
|
|
/**
|
|
* iommu_group_ref_get - Increment reference on a group
|
|
* @group: the group to use, must not be NULL
|
|
*
|
|
* This function is called by iommu drivers to take additional references on an
|
|
* existing group. Returns the given group for convenience.
|
|
*/
|
|
struct iommu_group *iommu_group_ref_get(struct iommu_group *group)
|
|
{
|
|
kobject_get(group->devices_kobj);
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_ref_get);
|
|
|
|
/**
|
|
* iommu_group_put - Decrement group reference
|
|
* @group: the group to use
|
|
*
|
|
* This function is called by iommu drivers and users to release the
|
|
* iommu group. Once the reference count is zero, the group is released.
|
|
*/
|
|
void iommu_group_put(struct iommu_group *group)
|
|
{
|
|
if (group)
|
|
kobject_put(group->devices_kobj);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_put);
|
|
|
|
/**
|
|
* iommu_group_register_notifier - Register a notifier for group changes
|
|
* @group: the group to watch
|
|
* @nb: notifier block to signal
|
|
*
|
|
* This function allows iommu group users to track changes in a group.
|
|
* See include/linux/iommu.h for actions sent via this notifier. Caller
|
|
* should hold a reference to the group throughout notifier registration.
|
|
*/
|
|
int iommu_group_register_notifier(struct iommu_group *group,
|
|
struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&group->notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_register_notifier);
|
|
|
|
/**
|
|
* iommu_group_unregister_notifier - Unregister a notifier
|
|
* @group: the group to watch
|
|
* @nb: notifier block to signal
|
|
*
|
|
* Unregister a previously registered group notifier block.
|
|
*/
|
|
int iommu_group_unregister_notifier(struct iommu_group *group,
|
|
struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&group->notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier);
|
|
|
|
/**
|
|
* iommu_register_device_fault_handler() - Register a device fault handler
|
|
* @dev: the device
|
|
* @handler: the fault handler
|
|
* @data: private data passed as argument to the handler
|
|
*
|
|
* When an IOMMU fault event is received, this handler gets called with the
|
|
* fault event and data as argument. The handler should return 0 on success. If
|
|
* the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also
|
|
* complete the fault by calling iommu_page_response() with one of the following
|
|
* response code:
|
|
* - IOMMU_PAGE_RESP_SUCCESS: retry the translation
|
|
* - IOMMU_PAGE_RESP_INVALID: terminate the fault
|
|
* - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting
|
|
* page faults if possible.
|
|
*
|
|
* Return 0 if the fault handler was installed successfully, or an error.
|
|
*/
|
|
int iommu_register_device_fault_handler(struct device *dev,
|
|
iommu_dev_fault_handler_t handler,
|
|
void *data)
|
|
{
|
|
struct dev_iommu *param = dev->iommu;
|
|
int ret = 0;
|
|
|
|
if (!param)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(¶m->lock);
|
|
/* Only allow one fault handler registered for each device */
|
|
if (param->fault_param) {
|
|
ret = -EBUSY;
|
|
goto done_unlock;
|
|
}
|
|
|
|
get_device(dev);
|
|
param->fault_param = kzalloc(sizeof(*param->fault_param), GFP_KERNEL);
|
|
if (!param->fault_param) {
|
|
put_device(dev);
|
|
ret = -ENOMEM;
|
|
goto done_unlock;
|
|
}
|
|
param->fault_param->handler = handler;
|
|
param->fault_param->data = data;
|
|
mutex_init(¶m->fault_param->lock);
|
|
INIT_LIST_HEAD(¶m->fault_param->faults);
|
|
|
|
done_unlock:
|
|
mutex_unlock(¶m->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler);
|
|
|
|
/**
|
|
* iommu_unregister_device_fault_handler() - Unregister the device fault handler
|
|
* @dev: the device
|
|
*
|
|
* Remove the device fault handler installed with
|
|
* iommu_register_device_fault_handler().
|
|
*
|
|
* Return 0 on success, or an error.
|
|
*/
|
|
int iommu_unregister_device_fault_handler(struct device *dev)
|
|
{
|
|
struct dev_iommu *param = dev->iommu;
|
|
int ret = 0;
|
|
|
|
if (!param)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(¶m->lock);
|
|
|
|
if (!param->fault_param)
|
|
goto unlock;
|
|
|
|
/* we cannot unregister handler if there are pending faults */
|
|
if (!list_empty(¶m->fault_param->faults)) {
|
|
ret = -EBUSY;
|
|
goto unlock;
|
|
}
|
|
|
|
kfree(param->fault_param);
|
|
param->fault_param = NULL;
|
|
put_device(dev);
|
|
unlock:
|
|
mutex_unlock(¶m->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler);
|
|
|
|
/**
|
|
* iommu_report_device_fault() - Report fault event to device driver
|
|
* @dev: the device
|
|
* @evt: fault event data
|
|
*
|
|
* Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ
|
|
* handler. When this function fails and the fault is recoverable, it is the
|
|
* caller's responsibility to complete the fault.
|
|
*
|
|
* Return 0 on success, or an error.
|
|
*/
|
|
int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
|
|
{
|
|
struct dev_iommu *param = dev->iommu;
|
|
struct iommu_fault_event *evt_pending = NULL;
|
|
struct iommu_fault_param *fparam;
|
|
int ret = 0;
|
|
|
|
if (!param || !evt)
|
|
return -EINVAL;
|
|
|
|
/* we only report device fault if there is a handler registered */
|
|
mutex_lock(¶m->lock);
|
|
fparam = param->fault_param;
|
|
if (!fparam || !fparam->handler) {
|
|
ret = -EINVAL;
|
|
goto done_unlock;
|
|
}
|
|
|
|
if (evt->fault.type == IOMMU_FAULT_PAGE_REQ &&
|
|
(evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) {
|
|
evt_pending = kmemdup(evt, sizeof(struct iommu_fault_event),
|
|
GFP_KERNEL);
|
|
if (!evt_pending) {
|
|
ret = -ENOMEM;
|
|
goto done_unlock;
|
|
}
|
|
mutex_lock(&fparam->lock);
|
|
list_add_tail(&evt_pending->list, &fparam->faults);
|
|
mutex_unlock(&fparam->lock);
|
|
}
|
|
|
|
ret = fparam->handler(&evt->fault, fparam->data);
|
|
if (ret && evt_pending) {
|
|
mutex_lock(&fparam->lock);
|
|
list_del(&evt_pending->list);
|
|
mutex_unlock(&fparam->lock);
|
|
kfree(evt_pending);
|
|
}
|
|
done_unlock:
|
|
mutex_unlock(¶m->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_report_device_fault);
|
|
|
|
int iommu_page_response(struct device *dev,
|
|
struct iommu_page_response *msg)
|
|
{
|
|
bool needs_pasid;
|
|
int ret = -EINVAL;
|
|
struct iommu_fault_event *evt;
|
|
struct iommu_fault_page_request *prm;
|
|
struct dev_iommu *param = dev->iommu;
|
|
bool has_pasid = msg->flags & IOMMU_PAGE_RESP_PASID_VALID;
|
|
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
|
|
|
|
if (!domain || !domain->ops->page_response)
|
|
return -ENODEV;
|
|
|
|
if (!param || !param->fault_param)
|
|
return -EINVAL;
|
|
|
|
if (msg->version != IOMMU_PAGE_RESP_VERSION_1 ||
|
|
msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID)
|
|
return -EINVAL;
|
|
|
|
/* Only send response if there is a fault report pending */
|
|
mutex_lock(¶m->fault_param->lock);
|
|
if (list_empty(¶m->fault_param->faults)) {
|
|
dev_warn_ratelimited(dev, "no pending PRQ, drop response\n");
|
|
goto done_unlock;
|
|
}
|
|
/*
|
|
* Check if we have a matching page request pending to respond,
|
|
* otherwise return -EINVAL
|
|
*/
|
|
list_for_each_entry(evt, ¶m->fault_param->faults, list) {
|
|
prm = &evt->fault.prm;
|
|
if (prm->grpid != msg->grpid)
|
|
continue;
|
|
|
|
/*
|
|
* If the PASID is required, the corresponding request is
|
|
* matched using the group ID, the PASID valid bit and the PASID
|
|
* value. Otherwise only the group ID matches request and
|
|
* response.
|
|
*/
|
|
needs_pasid = prm->flags & IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID;
|
|
if (needs_pasid && (!has_pasid || msg->pasid != prm->pasid))
|
|
continue;
|
|
|
|
if (!needs_pasid && has_pasid) {
|
|
/* No big deal, just clear it. */
|
|
msg->flags &= ~IOMMU_PAGE_RESP_PASID_VALID;
|
|
msg->pasid = 0;
|
|
}
|
|
|
|
ret = domain->ops->page_response(dev, evt, msg);
|
|
list_del(&evt->list);
|
|
kfree(evt);
|
|
break;
|
|
}
|
|
|
|
done_unlock:
|
|
mutex_unlock(¶m->fault_param->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_page_response);
|
|
|
|
/**
|
|
* iommu_group_id - Return ID for a group
|
|
* @group: the group to ID
|
|
*
|
|
* Return the unique ID for the group matching the sysfs group number.
|
|
*/
|
|
int iommu_group_id(struct iommu_group *group)
|
|
{
|
|
return group->id;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_id);
|
|
|
|
static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
|
|
unsigned long *devfns);
|
|
|
|
/*
|
|
* To consider a PCI device isolated, we require ACS to support Source
|
|
* Validation, Request Redirection, Completer Redirection, and Upstream
|
|
* Forwarding. This effectively means that devices cannot spoof their
|
|
* requester ID, requests and completions cannot be redirected, and all
|
|
* transactions are forwarded upstream, even as it passes through a
|
|
* bridge where the target device is downstream.
|
|
*/
|
|
#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
|
|
|
|
/*
|
|
* For multifunction devices which are not isolated from each other, find
|
|
* all the other non-isolated functions and look for existing groups. For
|
|
* each function, we also need to look for aliases to or from other devices
|
|
* that may already have a group.
|
|
*/
|
|
static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev,
|
|
unsigned long *devfns)
|
|
{
|
|
struct pci_dev *tmp = NULL;
|
|
struct iommu_group *group;
|
|
|
|
if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS))
|
|
return NULL;
|
|
|
|
for_each_pci_dev(tmp) {
|
|
if (tmp == pdev || tmp->bus != pdev->bus ||
|
|
PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) ||
|
|
pci_acs_enabled(tmp, REQ_ACS_FLAGS))
|
|
continue;
|
|
|
|
group = get_pci_alias_group(tmp, devfns);
|
|
if (group) {
|
|
pci_dev_put(tmp);
|
|
return group;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Look for aliases to or from the given device for existing groups. DMA
|
|
* aliases are only supported on the same bus, therefore the search
|
|
* space is quite small (especially since we're really only looking at pcie
|
|
* device, and therefore only expect multiple slots on the root complex or
|
|
* downstream switch ports). It's conceivable though that a pair of
|
|
* multifunction devices could have aliases between them that would cause a
|
|
* loop. To prevent this, we use a bitmap to track where we've been.
|
|
*/
|
|
static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
|
|
unsigned long *devfns)
|
|
{
|
|
struct pci_dev *tmp = NULL;
|
|
struct iommu_group *group;
|
|
|
|
if (test_and_set_bit(pdev->devfn & 0xff, devfns))
|
|
return NULL;
|
|
|
|
group = iommu_group_get(&pdev->dev);
|
|
if (group)
|
|
return group;
|
|
|
|
for_each_pci_dev(tmp) {
|
|
if (tmp == pdev || tmp->bus != pdev->bus)
|
|
continue;
|
|
|
|
/* We alias them or they alias us */
|
|
if (pci_devs_are_dma_aliases(pdev, tmp)) {
|
|
group = get_pci_alias_group(tmp, devfns);
|
|
if (group) {
|
|
pci_dev_put(tmp);
|
|
return group;
|
|
}
|
|
|
|
group = get_pci_function_alias_group(tmp, devfns);
|
|
if (group) {
|
|
pci_dev_put(tmp);
|
|
return group;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct group_for_pci_data {
|
|
struct pci_dev *pdev;
|
|
struct iommu_group *group;
|
|
};
|
|
|
|
/*
|
|
* DMA alias iterator callback, return the last seen device. Stop and return
|
|
* the IOMMU group if we find one along the way.
|
|
*/
|
|
static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque)
|
|
{
|
|
struct group_for_pci_data *data = opaque;
|
|
|
|
data->pdev = pdev;
|
|
data->group = iommu_group_get(&pdev->dev);
|
|
|
|
return data->group != NULL;
|
|
}
|
|
|
|
/*
|
|
* Generic device_group call-back function. It just allocates one
|
|
* iommu-group per device.
|
|
*/
|
|
struct iommu_group *generic_device_group(struct device *dev)
|
|
{
|
|
return iommu_group_alloc();
|
|
}
|
|
EXPORT_SYMBOL_GPL(generic_device_group);
|
|
|
|
/*
|
|
* Use standard PCI bus topology, isolation features, and DMA alias quirks
|
|
* to find or create an IOMMU group for a device.
|
|
*/
|
|
struct iommu_group *pci_device_group(struct device *dev)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct group_for_pci_data data;
|
|
struct pci_bus *bus;
|
|
struct iommu_group *group = NULL;
|
|
u64 devfns[4] = { 0 };
|
|
|
|
if (WARN_ON(!dev_is_pci(dev)))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/*
|
|
* Find the upstream DMA alias for the device. A device must not
|
|
* be aliased due to topology in order to have its own IOMMU group.
|
|
* If we find an alias along the way that already belongs to a
|
|
* group, use it.
|
|
*/
|
|
if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data))
|
|
return data.group;
|
|
|
|
pdev = data.pdev;
|
|
|
|
/*
|
|
* Continue upstream from the point of minimum IOMMU granularity
|
|
* due to aliases to the point where devices are protected from
|
|
* peer-to-peer DMA by PCI ACS. Again, if we find an existing
|
|
* group, use it.
|
|
*/
|
|
for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) {
|
|
if (!bus->self)
|
|
continue;
|
|
|
|
if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS))
|
|
break;
|
|
|
|
pdev = bus->self;
|
|
|
|
group = iommu_group_get(&pdev->dev);
|
|
if (group)
|
|
return group;
|
|
}
|
|
|
|
/*
|
|
* Look for existing groups on device aliases. If we alias another
|
|
* device or another device aliases us, use the same group.
|
|
*/
|
|
group = get_pci_alias_group(pdev, (unsigned long *)devfns);
|
|
if (group)
|
|
return group;
|
|
|
|
/*
|
|
* Look for existing groups on non-isolated functions on the same
|
|
* slot and aliases of those funcions, if any. No need to clear
|
|
* the search bitmap, the tested devfns are still valid.
|
|
*/
|
|
group = get_pci_function_alias_group(pdev, (unsigned long *)devfns);
|
|
if (group)
|
|
return group;
|
|
|
|
/* No shared group found, allocate new */
|
|
return iommu_group_alloc();
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_device_group);
|
|
|
|
/* Get the IOMMU group for device on fsl-mc bus */
|
|
struct iommu_group *fsl_mc_device_group(struct device *dev)
|
|
{
|
|
struct device *cont_dev = fsl_mc_cont_dev(dev);
|
|
struct iommu_group *group;
|
|
|
|
group = iommu_group_get(cont_dev);
|
|
if (!group)
|
|
group = iommu_group_alloc();
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsl_mc_device_group);
|
|
|
|
static int iommu_get_def_domain_type(struct device *dev)
|
|
{
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
|
|
if (dev_is_pci(dev) && to_pci_dev(dev)->untrusted)
|
|
return IOMMU_DOMAIN_DMA;
|
|
|
|
if (ops->def_domain_type)
|
|
return ops->def_domain_type(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iommu_group_alloc_default_domain(struct bus_type *bus,
|
|
struct iommu_group *group,
|
|
unsigned int type)
|
|
{
|
|
struct iommu_domain *dom;
|
|
|
|
dom = __iommu_domain_alloc(bus, type);
|
|
if (!dom && type != IOMMU_DOMAIN_DMA) {
|
|
dom = __iommu_domain_alloc(bus, IOMMU_DOMAIN_DMA);
|
|
if (dom)
|
|
pr_warn("Failed to allocate default IOMMU domain of type %u for group %s - Falling back to IOMMU_DOMAIN_DMA",
|
|
type, group->name);
|
|
}
|
|
|
|
if (!dom)
|
|
return -ENOMEM;
|
|
|
|
group->default_domain = dom;
|
|
if (!group->domain)
|
|
group->domain = dom;
|
|
return 0;
|
|
}
|
|
|
|
static int iommu_alloc_default_domain(struct iommu_group *group,
|
|
struct device *dev)
|
|
{
|
|
unsigned int type;
|
|
|
|
if (group->default_domain)
|
|
return 0;
|
|
|
|
type = iommu_get_def_domain_type(dev) ? : iommu_def_domain_type;
|
|
|
|
return iommu_group_alloc_default_domain(dev->bus, group, type);
|
|
}
|
|
|
|
/**
|
|
* iommu_group_get_for_dev - Find or create the IOMMU group for a device
|
|
* @dev: target device
|
|
*
|
|
* This function is intended to be called by IOMMU drivers and extended to
|
|
* support common, bus-defined algorithms when determining or creating the
|
|
* IOMMU group for a device. On success, the caller will hold a reference
|
|
* to the returned IOMMU group, which will already include the provided
|
|
* device. The reference should be released with iommu_group_put().
|
|
*/
|
|
static struct iommu_group *iommu_group_get_for_dev(struct device *dev)
|
|
{
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (group)
|
|
return group;
|
|
|
|
if (!ops)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
group = ops->device_group(dev);
|
|
if (WARN_ON_ONCE(group == NULL))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (IS_ERR(group))
|
|
return group;
|
|
|
|
ret = iommu_group_add_device(group, dev);
|
|
if (ret)
|
|
goto out_put_group;
|
|
|
|
return group;
|
|
|
|
out_put_group:
|
|
iommu_group_put(group);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
|
|
{
|
|
return group->default_domain;
|
|
}
|
|
|
|
static int probe_iommu_group(struct device *dev, void *data)
|
|
{
|
|
struct list_head *group_list = data;
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
/* Device is probed already if in a group */
|
|
group = iommu_group_get(dev);
|
|
if (group) {
|
|
iommu_group_put(group);
|
|
return 0;
|
|
}
|
|
|
|
ret = __iommu_probe_device(dev, group_list);
|
|
if (ret == -ENODEV)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int remove_iommu_group(struct device *dev, void *data)
|
|
{
|
|
iommu_release_device(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iommu_bus_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
unsigned long group_action = 0;
|
|
struct device *dev = data;
|
|
struct iommu_group *group;
|
|
|
|
/*
|
|
* ADD/DEL call into iommu driver ops if provided, which may
|
|
* result in ADD/DEL notifiers to group->notifier
|
|
*/
|
|
if (action == BUS_NOTIFY_ADD_DEVICE) {
|
|
int ret;
|
|
|
|
ret = iommu_probe_device(dev);
|
|
return (ret) ? NOTIFY_DONE : NOTIFY_OK;
|
|
} else if (action == BUS_NOTIFY_REMOVED_DEVICE) {
|
|
iommu_release_device(dev);
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/*
|
|
* Remaining BUS_NOTIFYs get filtered and republished to the
|
|
* group, if anyone is listening
|
|
*/
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return 0;
|
|
|
|
switch (action) {
|
|
case BUS_NOTIFY_BIND_DRIVER:
|
|
group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER;
|
|
break;
|
|
case BUS_NOTIFY_BOUND_DRIVER:
|
|
group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER;
|
|
break;
|
|
case BUS_NOTIFY_UNBIND_DRIVER:
|
|
group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER;
|
|
break;
|
|
case BUS_NOTIFY_UNBOUND_DRIVER:
|
|
group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
|
|
break;
|
|
}
|
|
|
|
if (group_action)
|
|
blocking_notifier_call_chain(&group->notifier,
|
|
group_action, dev);
|
|
|
|
iommu_group_put(group);
|
|
return 0;
|
|
}
|
|
|
|
struct __group_domain_type {
|
|
struct device *dev;
|
|
unsigned int type;
|
|
};
|
|
|
|
static int probe_get_default_domain_type(struct device *dev, void *data)
|
|
{
|
|
struct __group_domain_type *gtype = data;
|
|
unsigned int type = iommu_get_def_domain_type(dev);
|
|
|
|
if (type) {
|
|
if (gtype->type && gtype->type != type) {
|
|
dev_warn(dev, "Device needs domain type %s, but device %s in the same iommu group requires type %s - using default\n",
|
|
iommu_domain_type_str(type),
|
|
dev_name(gtype->dev),
|
|
iommu_domain_type_str(gtype->type));
|
|
gtype->type = 0;
|
|
}
|
|
|
|
if (!gtype->dev) {
|
|
gtype->dev = dev;
|
|
gtype->type = type;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void probe_alloc_default_domain(struct bus_type *bus,
|
|
struct iommu_group *group)
|
|
{
|
|
struct __group_domain_type gtype;
|
|
|
|
memset(>ype, 0, sizeof(gtype));
|
|
|
|
/* Ask for default domain requirements of all devices in the group */
|
|
__iommu_group_for_each_dev(group, >ype,
|
|
probe_get_default_domain_type);
|
|
|
|
if (!gtype.type)
|
|
gtype.type = iommu_def_domain_type;
|
|
|
|
iommu_group_alloc_default_domain(bus, group, gtype.type);
|
|
|
|
}
|
|
|
|
static int iommu_group_do_dma_attach(struct device *dev, void *data)
|
|
{
|
|
struct iommu_domain *domain = data;
|
|
int ret = 0;
|
|
|
|
if (!iommu_is_attach_deferred(domain, dev))
|
|
ret = __iommu_attach_device(domain, dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __iommu_group_dma_attach(struct iommu_group *group)
|
|
{
|
|
return __iommu_group_for_each_dev(group, group->default_domain,
|
|
iommu_group_do_dma_attach);
|
|
}
|
|
|
|
static int iommu_group_do_probe_finalize(struct device *dev, void *data)
|
|
{
|
|
struct iommu_domain *domain = data;
|
|
|
|
if (domain->ops->probe_finalize)
|
|
domain->ops->probe_finalize(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __iommu_group_dma_finalize(struct iommu_group *group)
|
|
{
|
|
__iommu_group_for_each_dev(group, group->default_domain,
|
|
iommu_group_do_probe_finalize);
|
|
}
|
|
|
|
static int iommu_do_create_direct_mappings(struct device *dev, void *data)
|
|
{
|
|
struct iommu_group *group = data;
|
|
|
|
iommu_create_device_direct_mappings(group, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iommu_group_create_direct_mappings(struct iommu_group *group)
|
|
{
|
|
return __iommu_group_for_each_dev(group, group,
|
|
iommu_do_create_direct_mappings);
|
|
}
|
|
|
|
int bus_iommu_probe(struct bus_type *bus)
|
|
{
|
|
struct iommu_group *group, *next;
|
|
LIST_HEAD(group_list);
|
|
int ret;
|
|
|
|
/*
|
|
* This code-path does not allocate the default domain when
|
|
* creating the iommu group, so do it after the groups are
|
|
* created.
|
|
*/
|
|
ret = bus_for_each_dev(bus, NULL, &group_list, probe_iommu_group);
|
|
if (ret)
|
|
return ret;
|
|
|
|
list_for_each_entry_safe(group, next, &group_list, entry) {
|
|
/* Remove item from the list */
|
|
list_del_init(&group->entry);
|
|
|
|
mutex_lock(&group->mutex);
|
|
|
|
/* Try to allocate default domain */
|
|
probe_alloc_default_domain(bus, group);
|
|
|
|
if (!group->default_domain) {
|
|
mutex_unlock(&group->mutex);
|
|
continue;
|
|
}
|
|
|
|
iommu_group_create_direct_mappings(group);
|
|
|
|
ret = __iommu_group_dma_attach(group);
|
|
|
|
mutex_unlock(&group->mutex);
|
|
|
|
if (ret)
|
|
break;
|
|
|
|
__iommu_group_dma_finalize(group);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
|
|
{
|
|
struct notifier_block *nb;
|
|
int err;
|
|
|
|
nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
|
|
if (!nb)
|
|
return -ENOMEM;
|
|
|
|
nb->notifier_call = iommu_bus_notifier;
|
|
|
|
err = bus_register_notifier(bus, nb);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
err = bus_iommu_probe(bus);
|
|
if (err)
|
|
goto out_err;
|
|
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
/* Clean up */
|
|
bus_for_each_dev(bus, NULL, NULL, remove_iommu_group);
|
|
bus_unregister_notifier(bus, nb);
|
|
|
|
out_free:
|
|
kfree(nb);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* bus_set_iommu - set iommu-callbacks for the bus
|
|
* @bus: bus.
|
|
* @ops: the callbacks provided by the iommu-driver
|
|
*
|
|
* This function is called by an iommu driver to set the iommu methods
|
|
* used for a particular bus. Drivers for devices on that bus can use
|
|
* the iommu-api after these ops are registered.
|
|
* This special function is needed because IOMMUs are usually devices on
|
|
* the bus itself, so the iommu drivers are not initialized when the bus
|
|
* is set up. With this function the iommu-driver can set the iommu-ops
|
|
* afterwards.
|
|
*/
|
|
int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
|
|
{
|
|
int err;
|
|
|
|
if (ops == NULL) {
|
|
bus->iommu_ops = NULL;
|
|
return 0;
|
|
}
|
|
|
|
if (bus->iommu_ops != NULL)
|
|
return -EBUSY;
|
|
|
|
bus->iommu_ops = ops;
|
|
|
|
/* Do IOMMU specific setup for this bus-type */
|
|
err = iommu_bus_init(bus, ops);
|
|
if (err)
|
|
bus->iommu_ops = NULL;
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bus_set_iommu);
|
|
|
|
bool iommu_present(struct bus_type *bus)
|
|
{
|
|
return bus->iommu_ops != NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_present);
|
|
|
|
bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
|
|
{
|
|
if (!bus->iommu_ops || !bus->iommu_ops->capable)
|
|
return false;
|
|
|
|
return bus->iommu_ops->capable(cap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_capable);
|
|
|
|
/**
|
|
* iommu_set_fault_handler() - set a fault handler for an iommu domain
|
|
* @domain: iommu domain
|
|
* @handler: fault handler
|
|
* @token: user data, will be passed back to the fault handler
|
|
*
|
|
* This function should be used by IOMMU users which want to be notified
|
|
* whenever an IOMMU fault happens.
|
|
*
|
|
* The fault handler itself should return 0 on success, and an appropriate
|
|
* error code otherwise.
|
|
*/
|
|
void iommu_set_fault_handler(struct iommu_domain *domain,
|
|
iommu_fault_handler_t handler,
|
|
void *token)
|
|
{
|
|
BUG_ON(!domain);
|
|
|
|
domain->handler = handler;
|
|
domain->handler_token = token;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
|
|
|
|
static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
|
|
unsigned type)
|
|
{
|
|
struct iommu_domain *domain;
|
|
|
|
if (bus == NULL || bus->iommu_ops == NULL)
|
|
return NULL;
|
|
|
|
domain = bus->iommu_ops->domain_alloc(type);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
domain->ops = bus->iommu_ops;
|
|
domain->type = type;
|
|
/* Assume all sizes by default; the driver may override this later */
|
|
domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap;
|
|
|
|
/* Temporarily avoid -EEXIST while drivers still get their own cookies */
|
|
if (iommu_is_dma_domain(domain) && !domain->iova_cookie && iommu_get_dma_cookie(domain)) {
|
|
iommu_domain_free(domain);
|
|
domain = NULL;
|
|
}
|
|
return domain;
|
|
}
|
|
|
|
struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
|
|
{
|
|
return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_alloc);
|
|
|
|
void iommu_domain_free(struct iommu_domain *domain)
|
|
{
|
|
iommu_put_dma_cookie(domain);
|
|
domain->ops->domain_free(domain);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_free);
|
|
|
|
static int __iommu_attach_device(struct iommu_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
int ret;
|
|
|
|
if (unlikely(domain->ops->attach_dev == NULL))
|
|
return -ENODEV;
|
|
|
|
ret = domain->ops->attach_dev(domain, dev);
|
|
if (!ret)
|
|
trace_attach_device_to_domain(dev);
|
|
return ret;
|
|
}
|
|
|
|
int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Lock the group to make sure the device-count doesn't
|
|
* change while we are attaching
|
|
*/
|
|
mutex_lock(&group->mutex);
|
|
ret = -EINVAL;
|
|
if (iommu_group_device_count(group) != 1)
|
|
goto out_unlock;
|
|
|
|
ret = __iommu_attach_group(domain, group);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_attach_device);
|
|
|
|
int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain)
|
|
{
|
|
const struct iommu_ops *ops = domain->ops;
|
|
|
|
if (ops->is_attach_deferred && ops->is_attach_deferred(domain, dev))
|
|
return __iommu_attach_device(domain, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check flags and other user provided data for valid combinations. We also
|
|
* make sure no reserved fields or unused flags are set. This is to ensure
|
|
* not breaking userspace in the future when these fields or flags are used.
|
|
*/
|
|
static int iommu_check_cache_invl_data(struct iommu_cache_invalidate_info *info)
|
|
{
|
|
u32 mask;
|
|
int i;
|
|
|
|
if (info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1)
|
|
return -EINVAL;
|
|
|
|
mask = (1 << IOMMU_CACHE_INV_TYPE_NR) - 1;
|
|
if (info->cache & ~mask)
|
|
return -EINVAL;
|
|
|
|
if (info->granularity >= IOMMU_INV_GRANU_NR)
|
|
return -EINVAL;
|
|
|
|
switch (info->granularity) {
|
|
case IOMMU_INV_GRANU_ADDR:
|
|
if (info->cache & IOMMU_CACHE_INV_TYPE_PASID)
|
|
return -EINVAL;
|
|
|
|
mask = IOMMU_INV_ADDR_FLAGS_PASID |
|
|
IOMMU_INV_ADDR_FLAGS_ARCHID |
|
|
IOMMU_INV_ADDR_FLAGS_LEAF;
|
|
|
|
if (info->granu.addr_info.flags & ~mask)
|
|
return -EINVAL;
|
|
break;
|
|
case IOMMU_INV_GRANU_PASID:
|
|
mask = IOMMU_INV_PASID_FLAGS_PASID |
|
|
IOMMU_INV_PASID_FLAGS_ARCHID;
|
|
if (info->granu.pasid_info.flags & ~mask)
|
|
return -EINVAL;
|
|
|
|
break;
|
|
case IOMMU_INV_GRANU_DOMAIN:
|
|
if (info->cache & IOMMU_CACHE_INV_TYPE_DEV_IOTLB)
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check reserved padding fields */
|
|
for (i = 0; i < sizeof(info->padding); i++) {
|
|
if (info->padding[i])
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int iommu_uapi_cache_invalidate(struct iommu_domain *domain, struct device *dev,
|
|
void __user *uinfo)
|
|
{
|
|
struct iommu_cache_invalidate_info inv_info = { 0 };
|
|
u32 minsz;
|
|
int ret;
|
|
|
|
if (unlikely(!domain->ops->cache_invalidate))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* No new spaces can be added before the variable sized union, the
|
|
* minimum size is the offset to the union.
|
|
*/
|
|
minsz = offsetof(struct iommu_cache_invalidate_info, granu);
|
|
|
|
/* Copy minsz from user to get flags and argsz */
|
|
if (copy_from_user(&inv_info, uinfo, minsz))
|
|
return -EFAULT;
|
|
|
|
/* Fields before the variable size union are mandatory */
|
|
if (inv_info.argsz < minsz)
|
|
return -EINVAL;
|
|
|
|
/* PASID and address granu require additional info beyond minsz */
|
|
if (inv_info.granularity == IOMMU_INV_GRANU_PASID &&
|
|
inv_info.argsz < offsetofend(struct iommu_cache_invalidate_info, granu.pasid_info))
|
|
return -EINVAL;
|
|
|
|
if (inv_info.granularity == IOMMU_INV_GRANU_ADDR &&
|
|
inv_info.argsz < offsetofend(struct iommu_cache_invalidate_info, granu.addr_info))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* User might be using a newer UAPI header which has a larger data
|
|
* size, we shall support the existing flags within the current
|
|
* size. Copy the remaining user data _after_ minsz but not more
|
|
* than the current kernel supported size.
|
|
*/
|
|
if (copy_from_user((void *)&inv_info + minsz, uinfo + minsz,
|
|
min_t(u32, inv_info.argsz, sizeof(inv_info)) - minsz))
|
|
return -EFAULT;
|
|
|
|
/* Now the argsz is validated, check the content */
|
|
ret = iommu_check_cache_invl_data(&inv_info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return domain->ops->cache_invalidate(domain, dev, &inv_info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_uapi_cache_invalidate);
|
|
|
|
static int iommu_check_bind_data(struct iommu_gpasid_bind_data *data)
|
|
{
|
|
u64 mask;
|
|
int i;
|
|
|
|
if (data->version != IOMMU_GPASID_BIND_VERSION_1)
|
|
return -EINVAL;
|
|
|
|
/* Check the range of supported formats */
|
|
if (data->format >= IOMMU_PASID_FORMAT_LAST)
|
|
return -EINVAL;
|
|
|
|
/* Check all flags */
|
|
mask = IOMMU_SVA_GPASID_VAL;
|
|
if (data->flags & ~mask)
|
|
return -EINVAL;
|
|
|
|
/* Check reserved padding fields */
|
|
for (i = 0; i < sizeof(data->padding); i++) {
|
|
if (data->padding[i])
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iommu_sva_prepare_bind_data(void __user *udata,
|
|
struct iommu_gpasid_bind_data *data)
|
|
{
|
|
u32 minsz;
|
|
|
|
/*
|
|
* No new spaces can be added before the variable sized union, the
|
|
* minimum size is the offset to the union.
|
|
*/
|
|
minsz = offsetof(struct iommu_gpasid_bind_data, vendor);
|
|
|
|
/* Copy minsz from user to get flags and argsz */
|
|
if (copy_from_user(data, udata, minsz))
|
|
return -EFAULT;
|
|
|
|
/* Fields before the variable size union are mandatory */
|
|
if (data->argsz < minsz)
|
|
return -EINVAL;
|
|
/*
|
|
* User might be using a newer UAPI header, we shall let IOMMU vendor
|
|
* driver decide on what size it needs. Since the guest PASID bind data
|
|
* can be vendor specific, larger argsz could be the result of extension
|
|
* for one vendor but it should not affect another vendor.
|
|
* Copy the remaining user data _after_ minsz
|
|
*/
|
|
if (copy_from_user((void *)data + minsz, udata + minsz,
|
|
min_t(u32, data->argsz, sizeof(*data)) - minsz))
|
|
return -EFAULT;
|
|
|
|
return iommu_check_bind_data(data);
|
|
}
|
|
|
|
int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain, struct device *dev,
|
|
void __user *udata)
|
|
{
|
|
struct iommu_gpasid_bind_data data = { 0 };
|
|
int ret;
|
|
|
|
if (unlikely(!domain->ops->sva_bind_gpasid))
|
|
return -ENODEV;
|
|
|
|
ret = iommu_sva_prepare_bind_data(udata, &data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return domain->ops->sva_bind_gpasid(domain, dev, &data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_uapi_sva_bind_gpasid);
|
|
|
|
int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev,
|
|
ioasid_t pasid)
|
|
{
|
|
if (unlikely(!domain->ops->sva_unbind_gpasid))
|
|
return -ENODEV;
|
|
|
|
return domain->ops->sva_unbind_gpasid(dev, pasid);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_sva_unbind_gpasid);
|
|
|
|
int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev,
|
|
void __user *udata)
|
|
{
|
|
struct iommu_gpasid_bind_data data = { 0 };
|
|
int ret;
|
|
|
|
if (unlikely(!domain->ops->sva_bind_gpasid))
|
|
return -ENODEV;
|
|
|
|
ret = iommu_sva_prepare_bind_data(udata, &data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return iommu_sva_unbind_gpasid(domain, dev, data.hpasid);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_uapi_sva_unbind_gpasid);
|
|
|
|
static void __iommu_detach_device(struct iommu_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
if (iommu_is_attach_deferred(domain, dev))
|
|
return;
|
|
|
|
if (unlikely(domain->ops->detach_dev == NULL))
|
|
return;
|
|
|
|
domain->ops->detach_dev(domain, dev);
|
|
trace_detach_device_from_domain(dev);
|
|
}
|
|
|
|
void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
struct iommu_group *group;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return;
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (iommu_group_device_count(group) != 1) {
|
|
WARN_ON(1);
|
|
goto out_unlock;
|
|
}
|
|
|
|
__iommu_detach_group(domain, group);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_detach_device);
|
|
|
|
struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
|
|
{
|
|
struct iommu_domain *domain;
|
|
struct iommu_group *group;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return NULL;
|
|
|
|
domain = group->domain;
|
|
|
|
iommu_group_put(group);
|
|
|
|
return domain;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);
|
|
|
|
/*
|
|
* For IOMMU_DOMAIN_DMA implementations which already provide their own
|
|
* guarantees that the group and its default domain are valid and correct.
|
|
*/
|
|
struct iommu_domain *iommu_get_dma_domain(struct device *dev)
|
|
{
|
|
return dev->iommu_group->default_domain;
|
|
}
|
|
|
|
/*
|
|
* IOMMU groups are really the natural working unit of the IOMMU, but
|
|
* the IOMMU API works on domains and devices. Bridge that gap by
|
|
* iterating over the devices in a group. Ideally we'd have a single
|
|
* device which represents the requestor ID of the group, but we also
|
|
* allow IOMMU drivers to create policy defined minimum sets, where
|
|
* the physical hardware may be able to distiguish members, but we
|
|
* wish to group them at a higher level (ex. untrusted multi-function
|
|
* PCI devices). Thus we attach each device.
|
|
*/
|
|
static int iommu_group_do_attach_device(struct device *dev, void *data)
|
|
{
|
|
struct iommu_domain *domain = data;
|
|
|
|
return __iommu_attach_device(domain, dev);
|
|
}
|
|
|
|
static int __iommu_attach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group)
|
|
{
|
|
int ret;
|
|
|
|
if (group->default_domain && group->domain != group->default_domain)
|
|
return -EBUSY;
|
|
|
|
ret = __iommu_group_for_each_dev(group, domain,
|
|
iommu_group_do_attach_device);
|
|
if (ret == 0)
|
|
group->domain = domain;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&group->mutex);
|
|
ret = __iommu_attach_group(domain, group);
|
|
mutex_unlock(&group->mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_attach_group);
|
|
|
|
static int iommu_group_do_detach_device(struct device *dev, void *data)
|
|
{
|
|
struct iommu_domain *domain = data;
|
|
|
|
__iommu_detach_device(domain, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __iommu_detach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group)
|
|
{
|
|
int ret;
|
|
|
|
if (!group->default_domain) {
|
|
__iommu_group_for_each_dev(group, domain,
|
|
iommu_group_do_detach_device);
|
|
group->domain = NULL;
|
|
return;
|
|
}
|
|
|
|
if (group->domain == group->default_domain)
|
|
return;
|
|
|
|
/* Detach by re-attaching to the default domain */
|
|
ret = __iommu_group_for_each_dev(group, group->default_domain,
|
|
iommu_group_do_attach_device);
|
|
if (ret != 0)
|
|
WARN_ON(1);
|
|
else
|
|
group->domain = group->default_domain;
|
|
}
|
|
|
|
void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
|
|
{
|
|
mutex_lock(&group->mutex);
|
|
__iommu_detach_group(domain, group);
|
|
mutex_unlock(&group->mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_detach_group);
|
|
|
|
phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
|
|
{
|
|
if (domain->type == IOMMU_DOMAIN_IDENTITY)
|
|
return iova;
|
|
|
|
if (domain->type == IOMMU_DOMAIN_BLOCKED)
|
|
return 0;
|
|
|
|
return domain->ops->iova_to_phys(domain, iova);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
|
|
|
|
static size_t iommu_pgsize(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, size_t *count)
|
|
{
|
|
unsigned int pgsize_idx, pgsize_idx_next;
|
|
unsigned long pgsizes;
|
|
size_t offset, pgsize, pgsize_next;
|
|
unsigned long addr_merge = paddr | iova;
|
|
|
|
/* Page sizes supported by the hardware and small enough for @size */
|
|
pgsizes = domain->pgsize_bitmap & GENMASK(__fls(size), 0);
|
|
|
|
/* Constrain the page sizes further based on the maximum alignment */
|
|
if (likely(addr_merge))
|
|
pgsizes &= GENMASK(__ffs(addr_merge), 0);
|
|
|
|
/* Make sure we have at least one suitable page size */
|
|
BUG_ON(!pgsizes);
|
|
|
|
/* Pick the biggest page size remaining */
|
|
pgsize_idx = __fls(pgsizes);
|
|
pgsize = BIT(pgsize_idx);
|
|
if (!count)
|
|
return pgsize;
|
|
|
|
/* Find the next biggest support page size, if it exists */
|
|
pgsizes = domain->pgsize_bitmap & ~GENMASK(pgsize_idx, 0);
|
|
if (!pgsizes)
|
|
goto out_set_count;
|
|
|
|
pgsize_idx_next = __ffs(pgsizes);
|
|
pgsize_next = BIT(pgsize_idx_next);
|
|
|
|
/*
|
|
* There's no point trying a bigger page size unless the virtual
|
|
* and physical addresses are similarly offset within the larger page.
|
|
*/
|
|
if ((iova ^ paddr) & (pgsize_next - 1))
|
|
goto out_set_count;
|
|
|
|
/* Calculate the offset to the next page size alignment boundary */
|
|
offset = pgsize_next - (addr_merge & (pgsize_next - 1));
|
|
|
|
/*
|
|
* If size is big enough to accommodate the larger page, reduce
|
|
* the number of smaller pages.
|
|
*/
|
|
if (offset + pgsize_next <= size)
|
|
size = offset;
|
|
|
|
out_set_count:
|
|
*count = size >> pgsize_idx;
|
|
return pgsize;
|
|
}
|
|
|
|
static int __iommu_map_pages(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot,
|
|
gfp_t gfp, size_t *mapped)
|
|
{
|
|
const struct iommu_ops *ops = domain->ops;
|
|
size_t pgsize, count;
|
|
int ret;
|
|
|
|
pgsize = iommu_pgsize(domain, iova, paddr, size, &count);
|
|
|
|
pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx count %zu\n",
|
|
iova, &paddr, pgsize, count);
|
|
|
|
if (ops->map_pages) {
|
|
ret = ops->map_pages(domain, iova, paddr, pgsize, count, prot,
|
|
gfp, mapped);
|
|
} else {
|
|
ret = ops->map(domain, iova, paddr, pgsize, prot, gfp);
|
|
*mapped = ret ? 0 : pgsize;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
|
|
{
|
|
const struct iommu_ops *ops = domain->ops;
|
|
unsigned long orig_iova = iova;
|
|
unsigned int min_pagesz;
|
|
size_t orig_size = size;
|
|
phys_addr_t orig_paddr = paddr;
|
|
int ret = 0;
|
|
|
|
if (unlikely(!(ops->map || ops->map_pages) ||
|
|
domain->pgsize_bitmap == 0UL))
|
|
return -ENODEV;
|
|
|
|
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
|
|
return -EINVAL;
|
|
|
|
/* find out the minimum page size supported */
|
|
min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
|
|
|
|
/*
|
|
* both the virtual address and the physical one, as well as
|
|
* the size of the mapping, must be aligned (at least) to the
|
|
* size of the smallest page supported by the hardware
|
|
*/
|
|
if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
|
|
pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
|
|
iova, &paddr, size, min_pagesz);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size);
|
|
|
|
while (size) {
|
|
size_t mapped = 0;
|
|
|
|
ret = __iommu_map_pages(domain, iova, paddr, size, prot, gfp,
|
|
&mapped);
|
|
/*
|
|
* Some pages may have been mapped, even if an error occurred,
|
|
* so we should account for those so they can be unmapped.
|
|
*/
|
|
size -= mapped;
|
|
|
|
if (ret)
|
|
break;
|
|
|
|
iova += mapped;
|
|
paddr += mapped;
|
|
}
|
|
|
|
/* unroll mapping in case something went wrong */
|
|
if (ret)
|
|
iommu_unmap(domain, orig_iova, orig_size - size);
|
|
else
|
|
trace_map(orig_iova, orig_paddr, orig_size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _iommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
|
|
{
|
|
const struct iommu_ops *ops = domain->ops;
|
|
int ret;
|
|
|
|
ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
|
|
if (ret == 0 && ops->iotlb_sync_map)
|
|
ops->iotlb_sync_map(domain, iova, size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int iommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot)
|
|
{
|
|
might_sleep();
|
|
return _iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_map);
|
|
|
|
int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot)
|
|
{
|
|
return _iommu_map(domain, iova, paddr, size, prot, GFP_ATOMIC);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_map_atomic);
|
|
|
|
static size_t __iommu_unmap_pages(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size,
|
|
struct iommu_iotlb_gather *iotlb_gather)
|
|
{
|
|
const struct iommu_ops *ops = domain->ops;
|
|
size_t pgsize, count;
|
|
|
|
pgsize = iommu_pgsize(domain, iova, iova, size, &count);
|
|
return ops->unmap_pages ?
|
|
ops->unmap_pages(domain, iova, pgsize, count, iotlb_gather) :
|
|
ops->unmap(domain, iova, pgsize, iotlb_gather);
|
|
}
|
|
|
|
static size_t __iommu_unmap(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size,
|
|
struct iommu_iotlb_gather *iotlb_gather)
|
|
{
|
|
const struct iommu_ops *ops = domain->ops;
|
|
size_t unmapped_page, unmapped = 0;
|
|
unsigned long orig_iova = iova;
|
|
unsigned int min_pagesz;
|
|
|
|
if (unlikely(!(ops->unmap || ops->unmap_pages) ||
|
|
domain->pgsize_bitmap == 0UL))
|
|
return 0;
|
|
|
|
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
|
|
return 0;
|
|
|
|
/* find out the minimum page size supported */
|
|
min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
|
|
|
|
/*
|
|
* The virtual address, as well as the size of the mapping, must be
|
|
* aligned (at least) to the size of the smallest page supported
|
|
* by the hardware
|
|
*/
|
|
if (!IS_ALIGNED(iova | size, min_pagesz)) {
|
|
pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
|
|
iova, size, min_pagesz);
|
|
return 0;
|
|
}
|
|
|
|
pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);
|
|
|
|
/*
|
|
* Keep iterating until we either unmap 'size' bytes (or more)
|
|
* or we hit an area that isn't mapped.
|
|
*/
|
|
while (unmapped < size) {
|
|
unmapped_page = __iommu_unmap_pages(domain, iova,
|
|
size - unmapped,
|
|
iotlb_gather);
|
|
if (!unmapped_page)
|
|
break;
|
|
|
|
pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
|
|
iova, unmapped_page);
|
|
|
|
iova += unmapped_page;
|
|
unmapped += unmapped_page;
|
|
}
|
|
|
|
trace_unmap(orig_iova, size, unmapped);
|
|
return unmapped;
|
|
}
|
|
|
|
size_t iommu_unmap(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size)
|
|
{
|
|
struct iommu_iotlb_gather iotlb_gather;
|
|
size_t ret;
|
|
|
|
iommu_iotlb_gather_init(&iotlb_gather);
|
|
ret = __iommu_unmap(domain, iova, size, &iotlb_gather);
|
|
iommu_iotlb_sync(domain, &iotlb_gather);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unmap);
|
|
|
|
size_t iommu_unmap_fast(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size,
|
|
struct iommu_iotlb_gather *iotlb_gather)
|
|
{
|
|
return __iommu_unmap(domain, iova, size, iotlb_gather);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unmap_fast);
|
|
|
|
static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
|
|
struct scatterlist *sg, unsigned int nents, int prot,
|
|
gfp_t gfp)
|
|
{
|
|
const struct iommu_ops *ops = domain->ops;
|
|
size_t len = 0, mapped = 0;
|
|
phys_addr_t start;
|
|
unsigned int i = 0;
|
|
int ret;
|
|
|
|
while (i <= nents) {
|
|
phys_addr_t s_phys = sg_phys(sg);
|
|
|
|
if (len && s_phys != start + len) {
|
|
ret = __iommu_map(domain, iova + mapped, start,
|
|
len, prot, gfp);
|
|
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
mapped += len;
|
|
len = 0;
|
|
}
|
|
|
|
if (len) {
|
|
len += sg->length;
|
|
} else {
|
|
len = sg->length;
|
|
start = s_phys;
|
|
}
|
|
|
|
if (++i < nents)
|
|
sg = sg_next(sg);
|
|
}
|
|
|
|
if (ops->iotlb_sync_map)
|
|
ops->iotlb_sync_map(domain, iova, mapped);
|
|
return mapped;
|
|
|
|
out_err:
|
|
/* undo mappings already done */
|
|
iommu_unmap(domain, iova, mapped);
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
|
|
struct scatterlist *sg, unsigned int nents, int prot)
|
|
{
|
|
might_sleep();
|
|
return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_KERNEL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_map_sg);
|
|
|
|
ssize_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova,
|
|
struct scatterlist *sg, unsigned int nents, int prot)
|
|
{
|
|
return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC);
|
|
}
|
|
|
|
/**
|
|
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
|
|
* @domain: the iommu domain where the fault has happened
|
|
* @dev: the device where the fault has happened
|
|
* @iova: the faulting address
|
|
* @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
|
|
*
|
|
* This function should be called by the low-level IOMMU implementations
|
|
* whenever IOMMU faults happen, to allow high-level users, that are
|
|
* interested in such events, to know about them.
|
|
*
|
|
* This event may be useful for several possible use cases:
|
|
* - mere logging of the event
|
|
* - dynamic TLB/PTE loading
|
|
* - if restarting of the faulting device is required
|
|
*
|
|
* Returns 0 on success and an appropriate error code otherwise (if dynamic
|
|
* PTE/TLB loading will one day be supported, implementations will be able
|
|
* to tell whether it succeeded or not according to this return value).
|
|
*
|
|
* Specifically, -ENOSYS is returned if a fault handler isn't installed
|
|
* (though fault handlers can also return -ENOSYS, in case they want to
|
|
* elicit the default behavior of the IOMMU drivers).
|
|
*/
|
|
int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
|
|
unsigned long iova, int flags)
|
|
{
|
|
int ret = -ENOSYS;
|
|
|
|
/*
|
|
* if upper layers showed interest and installed a fault handler,
|
|
* invoke it.
|
|
*/
|
|
if (domain->handler)
|
|
ret = domain->handler(domain, dev, iova, flags,
|
|
domain->handler_token);
|
|
|
|
trace_io_page_fault(dev, iova, flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(report_iommu_fault);
|
|
|
|
static int __init iommu_init(void)
|
|
{
|
|
iommu_group_kset = kset_create_and_add("iommu_groups",
|
|
NULL, kernel_kobj);
|
|
BUG_ON(!iommu_group_kset);
|
|
|
|
iommu_debugfs_setup();
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(iommu_init);
|
|
|
|
int iommu_enable_nesting(struct iommu_domain *domain)
|
|
{
|
|
if (domain->type != IOMMU_DOMAIN_UNMANAGED)
|
|
return -EINVAL;
|
|
if (!domain->ops->enable_nesting)
|
|
return -EINVAL;
|
|
return domain->ops->enable_nesting(domain);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_enable_nesting);
|
|
|
|
int iommu_set_pgtable_quirks(struct iommu_domain *domain,
|
|
unsigned long quirk)
|
|
{
|
|
if (domain->type != IOMMU_DOMAIN_UNMANAGED)
|
|
return -EINVAL;
|
|
if (!domain->ops->set_pgtable_quirks)
|
|
return -EINVAL;
|
|
return domain->ops->set_pgtable_quirks(domain, quirk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_set_pgtable_quirks);
|
|
|
|
void iommu_get_resv_regions(struct device *dev, struct list_head *list)
|
|
{
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
|
|
if (ops && ops->get_resv_regions)
|
|
ops->get_resv_regions(dev, list);
|
|
}
|
|
|
|
void iommu_put_resv_regions(struct device *dev, struct list_head *list)
|
|
{
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
|
|
if (ops && ops->put_resv_regions)
|
|
ops->put_resv_regions(dev, list);
|
|
}
|
|
|
|
/**
|
|
* generic_iommu_put_resv_regions - Reserved region driver helper
|
|
* @dev: device for which to free reserved regions
|
|
* @list: reserved region list for device
|
|
*
|
|
* IOMMU drivers can use this to implement their .put_resv_regions() callback
|
|
* for simple reservations. Memory allocated for each reserved region will be
|
|
* freed. If an IOMMU driver allocates additional resources per region, it is
|
|
* going to have to implement a custom callback.
|
|
*/
|
|
void generic_iommu_put_resv_regions(struct device *dev, struct list_head *list)
|
|
{
|
|
struct iommu_resv_region *entry, *next;
|
|
|
|
list_for_each_entry_safe(entry, next, list, list)
|
|
kfree(entry);
|
|
}
|
|
EXPORT_SYMBOL(generic_iommu_put_resv_regions);
|
|
|
|
struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
|
|
size_t length, int prot,
|
|
enum iommu_resv_type type)
|
|
{
|
|
struct iommu_resv_region *region;
|
|
|
|
region = kzalloc(sizeof(*region), GFP_KERNEL);
|
|
if (!region)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(®ion->list);
|
|
region->start = start;
|
|
region->length = length;
|
|
region->prot = prot;
|
|
region->type = type;
|
|
return region;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_alloc_resv_region);
|
|
|
|
void iommu_set_default_passthrough(bool cmd_line)
|
|
{
|
|
if (cmd_line)
|
|
iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API;
|
|
iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
|
|
}
|
|
|
|
void iommu_set_default_translated(bool cmd_line)
|
|
{
|
|
if (cmd_line)
|
|
iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API;
|
|
iommu_def_domain_type = IOMMU_DOMAIN_DMA;
|
|
}
|
|
|
|
bool iommu_default_passthrough(void)
|
|
{
|
|
return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_default_passthrough);
|
|
|
|
const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
|
|
{
|
|
const struct iommu_ops *ops = NULL;
|
|
struct iommu_device *iommu;
|
|
|
|
spin_lock(&iommu_device_lock);
|
|
list_for_each_entry(iommu, &iommu_device_list, list)
|
|
if (iommu->fwnode == fwnode) {
|
|
ops = iommu->ops;
|
|
break;
|
|
}
|
|
spin_unlock(&iommu_device_lock);
|
|
return ops;
|
|
}
|
|
|
|
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
|
|
const struct iommu_ops *ops)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
|
|
if (fwspec)
|
|
return ops == fwspec->ops ? 0 : -EINVAL;
|
|
|
|
if (!dev_iommu_get(dev))
|
|
return -ENOMEM;
|
|
|
|
/* Preallocate for the overwhelmingly common case of 1 ID */
|
|
fwspec = kzalloc(struct_size(fwspec, ids, 1), GFP_KERNEL);
|
|
if (!fwspec)
|
|
return -ENOMEM;
|
|
|
|
of_node_get(to_of_node(iommu_fwnode));
|
|
fwspec->iommu_fwnode = iommu_fwnode;
|
|
fwspec->ops = ops;
|
|
dev_iommu_fwspec_set(dev, fwspec);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_init);
|
|
|
|
void iommu_fwspec_free(struct device *dev)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
|
|
if (fwspec) {
|
|
fwnode_handle_put(fwspec->iommu_fwnode);
|
|
kfree(fwspec);
|
|
dev_iommu_fwspec_set(dev, NULL);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_free);
|
|
|
|
int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
int i, new_num;
|
|
|
|
if (!fwspec)
|
|
return -EINVAL;
|
|
|
|
new_num = fwspec->num_ids + num_ids;
|
|
if (new_num > 1) {
|
|
fwspec = krealloc(fwspec, struct_size(fwspec, ids, new_num),
|
|
GFP_KERNEL);
|
|
if (!fwspec)
|
|
return -ENOMEM;
|
|
|
|
dev_iommu_fwspec_set(dev, fwspec);
|
|
}
|
|
|
|
for (i = 0; i < num_ids; i++)
|
|
fwspec->ids[fwspec->num_ids + i] = ids[i];
|
|
|
|
fwspec->num_ids = new_num;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);
|
|
|
|
/*
|
|
* Per device IOMMU features.
|
|
*/
|
|
int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
|
|
{
|
|
if (dev->iommu && dev->iommu->iommu_dev) {
|
|
const struct iommu_ops *ops = dev->iommu->iommu_dev->ops;
|
|
|
|
if (ops->dev_enable_feat)
|
|
return ops->dev_enable_feat(dev, feat);
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_dev_enable_feature);
|
|
|
|
/*
|
|
* The device drivers should do the necessary cleanups before calling this.
|
|
* For example, before disabling the aux-domain feature, the device driver
|
|
* should detach all aux-domains. Otherwise, this will return -EBUSY.
|
|
*/
|
|
int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
|
|
{
|
|
if (dev->iommu && dev->iommu->iommu_dev) {
|
|
const struct iommu_ops *ops = dev->iommu->iommu_dev->ops;
|
|
|
|
if (ops->dev_disable_feat)
|
|
return ops->dev_disable_feat(dev, feat);
|
|
}
|
|
|
|
return -EBUSY;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_dev_disable_feature);
|
|
|
|
bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
|
|
{
|
|
if (dev->iommu && dev->iommu->iommu_dev) {
|
|
const struct iommu_ops *ops = dev->iommu->iommu_dev->ops;
|
|
|
|
if (ops->dev_feat_enabled)
|
|
return ops->dev_feat_enabled(dev, feat);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_dev_feature_enabled);
|
|
|
|
/*
|
|
* Aux-domain specific attach/detach.
|
|
*
|
|
* Only works if iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX) returns
|
|
* true. Also, as long as domains are attached to a device through this
|
|
* interface, any tries to call iommu_attach_device() should fail
|
|
* (iommu_detach_device() can't fail, so we fail when trying to re-attach).
|
|
* This should make us safe against a device being attached to a guest as a
|
|
* whole while there are still pasid users on it (aux and sva).
|
|
*/
|
|
int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
int ret = -ENODEV;
|
|
|
|
if (domain->ops->aux_attach_dev)
|
|
ret = domain->ops->aux_attach_dev(domain, dev);
|
|
|
|
if (!ret)
|
|
trace_attach_device_to_domain(dev);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_aux_attach_device);
|
|
|
|
void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
if (domain->ops->aux_detach_dev) {
|
|
domain->ops->aux_detach_dev(domain, dev);
|
|
trace_detach_device_from_domain(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_aux_detach_device);
|
|
|
|
int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
int ret = -ENODEV;
|
|
|
|
if (domain->ops->aux_get_pasid)
|
|
ret = domain->ops->aux_get_pasid(domain, dev);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_aux_get_pasid);
|
|
|
|
/**
|
|
* iommu_sva_bind_device() - Bind a process address space to a device
|
|
* @dev: the device
|
|
* @mm: the mm to bind, caller must hold a reference to it
|
|
*
|
|
* Create a bond between device and address space, allowing the device to access
|
|
* the mm using the returned PASID. If a bond already exists between @device and
|
|
* @mm, it is returned and an additional reference is taken. Caller must call
|
|
* iommu_sva_unbind_device() to release each reference.
|
|
*
|
|
* iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to
|
|
* initialize the required SVA features.
|
|
*
|
|
* On error, returns an ERR_PTR value.
|
|
*/
|
|
struct iommu_sva *
|
|
iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
|
|
{
|
|
struct iommu_group *group;
|
|
struct iommu_sva *handle = ERR_PTR(-EINVAL);
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
|
|
if (!ops || !ops->sva_bind)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
/* Ensure device count and domain don't change while we're binding */
|
|
mutex_lock(&group->mutex);
|
|
|
|
/*
|
|
* To keep things simple, SVA currently doesn't support IOMMU groups
|
|
* with more than one device. Existing SVA-capable systems are not
|
|
* affected by the problems that required IOMMU groups (lack of ACS
|
|
* isolation, device ID aliasing and other hardware issues).
|
|
*/
|
|
if (iommu_group_device_count(group) != 1)
|
|
goto out_unlock;
|
|
|
|
handle = ops->sva_bind(dev, mm, drvdata);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
|
|
return handle;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_sva_bind_device);
|
|
|
|
/**
|
|
* iommu_sva_unbind_device() - Remove a bond created with iommu_sva_bind_device
|
|
* @handle: the handle returned by iommu_sva_bind_device()
|
|
*
|
|
* Put reference to a bond between device and address space. The device should
|
|
* not be issuing any more transaction for this PASID. All outstanding page
|
|
* requests for this PASID must have been flushed to the IOMMU.
|
|
*/
|
|
void iommu_sva_unbind_device(struct iommu_sva *handle)
|
|
{
|
|
struct iommu_group *group;
|
|
struct device *dev = handle->dev;
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
|
|
if (!ops || !ops->sva_unbind)
|
|
return;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return;
|
|
|
|
mutex_lock(&group->mutex);
|
|
ops->sva_unbind(handle);
|
|
mutex_unlock(&group->mutex);
|
|
|
|
iommu_group_put(group);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_sva_unbind_device);
|
|
|
|
u32 iommu_sva_get_pasid(struct iommu_sva *handle)
|
|
{
|
|
const struct iommu_ops *ops = handle->dev->bus->iommu_ops;
|
|
|
|
if (!ops || !ops->sva_get_pasid)
|
|
return IOMMU_PASID_INVALID;
|
|
|
|
return ops->sva_get_pasid(handle);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);
|
|
|
|
/*
|
|
* Changes the default domain of an iommu group that has *only* one device
|
|
*
|
|
* @group: The group for which the default domain should be changed
|
|
* @prev_dev: The device in the group (this is used to make sure that the device
|
|
* hasn't changed after the caller has called this function)
|
|
* @type: The type of the new default domain that gets associated with the group
|
|
*
|
|
* Returns 0 on success and error code on failure
|
|
*
|
|
* Note:
|
|
* 1. Presently, this function is called only when user requests to change the
|
|
* group's default domain type through /sys/kernel/iommu_groups/<grp_id>/type
|
|
* Please take a closer look if intended to use for other purposes.
|
|
*/
|
|
static int iommu_change_dev_def_domain(struct iommu_group *group,
|
|
struct device *prev_dev, int type)
|
|
{
|
|
struct iommu_domain *prev_dom;
|
|
struct group_device *grp_dev;
|
|
int ret, dev_def_dom;
|
|
struct device *dev;
|
|
|
|
mutex_lock(&group->mutex);
|
|
|
|
if (group->default_domain != group->domain) {
|
|
dev_err_ratelimited(prev_dev, "Group not assigned to default domain\n");
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* iommu group wasn't locked while acquiring device lock in
|
|
* iommu_group_store_type(). So, make sure that the device count hasn't
|
|
* changed while acquiring device lock.
|
|
*
|
|
* Changing default domain of an iommu group with two or more devices
|
|
* isn't supported because there could be a potential deadlock. Consider
|
|
* the following scenario. T1 is trying to acquire device locks of all
|
|
* the devices in the group and before it could acquire all of them,
|
|
* there could be another thread T2 (from different sub-system and use
|
|
* case) that has already acquired some of the device locks and might be
|
|
* waiting for T1 to release other device locks.
|
|
*/
|
|
if (iommu_group_device_count(group) != 1) {
|
|
dev_err_ratelimited(prev_dev, "Cannot change default domain: Group has more than one device\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Since group has only one device */
|
|
grp_dev = list_first_entry(&group->devices, struct group_device, list);
|
|
dev = grp_dev->dev;
|
|
|
|
if (prev_dev != dev) {
|
|
dev_err_ratelimited(prev_dev, "Cannot change default domain: Device has been changed\n");
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
prev_dom = group->default_domain;
|
|
if (!prev_dom) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
dev_def_dom = iommu_get_def_domain_type(dev);
|
|
if (!type) {
|
|
/*
|
|
* If the user hasn't requested any specific type of domain and
|
|
* if the device supports both the domains, then default to the
|
|
* domain the device was booted with
|
|
*/
|
|
type = dev_def_dom ? : iommu_def_domain_type;
|
|
} else if (dev_def_dom && type != dev_def_dom) {
|
|
dev_err_ratelimited(prev_dev, "Device cannot be in %s domain\n",
|
|
iommu_domain_type_str(type));
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Switch to a new domain only if the requested domain type is different
|
|
* from the existing default domain type
|
|
*/
|
|
if (prev_dom->type == type) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* We can bring up a flush queue without tearing down the domain */
|
|
if (type == IOMMU_DOMAIN_DMA_FQ && prev_dom->type == IOMMU_DOMAIN_DMA) {
|
|
ret = iommu_dma_init_fq(prev_dom);
|
|
if (!ret)
|
|
prev_dom->type = IOMMU_DOMAIN_DMA_FQ;
|
|
goto out;
|
|
}
|
|
|
|
/* Sets group->default_domain to the newly allocated domain */
|
|
ret = iommu_group_alloc_default_domain(dev->bus, group, type);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = iommu_create_device_direct_mappings(group, dev);
|
|
if (ret)
|
|
goto free_new_domain;
|
|
|
|
ret = __iommu_attach_device(group->default_domain, dev);
|
|
if (ret)
|
|
goto free_new_domain;
|
|
|
|
group->domain = group->default_domain;
|
|
|
|
/*
|
|
* Release the mutex here because ops->probe_finalize() call-back of
|
|
* some vendor IOMMU drivers calls arm_iommu_attach_device() which
|
|
* in-turn might call back into IOMMU core code, where it tries to take
|
|
* group->mutex, resulting in a deadlock.
|
|
*/
|
|
mutex_unlock(&group->mutex);
|
|
|
|
/* Make sure dma_ops is appropriatley set */
|
|
iommu_group_do_probe_finalize(dev, group->default_domain);
|
|
iommu_domain_free(prev_dom);
|
|
return 0;
|
|
|
|
free_new_domain:
|
|
iommu_domain_free(group->default_domain);
|
|
group->default_domain = prev_dom;
|
|
group->domain = prev_dom;
|
|
|
|
out:
|
|
mutex_unlock(&group->mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Changing the default domain through sysfs requires the users to unbind the
|
|
* drivers from the devices in the iommu group, except for a DMA -> DMA-FQ
|
|
* transition. Return failure if this isn't met.
|
|
*
|
|
* We need to consider the race between this and the device release path.
|
|
* device_lock(dev) is used here to guarantee that the device release path
|
|
* will not be entered at the same time.
|
|
*/
|
|
static ssize_t iommu_group_store_type(struct iommu_group *group,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct group_device *grp_dev;
|
|
struct device *dev;
|
|
int ret, req_type;
|
|
|
|
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
|
|
return -EACCES;
|
|
|
|
if (WARN_ON(!group))
|
|
return -EINVAL;
|
|
|
|
if (sysfs_streq(buf, "identity"))
|
|
req_type = IOMMU_DOMAIN_IDENTITY;
|
|
else if (sysfs_streq(buf, "DMA"))
|
|
req_type = IOMMU_DOMAIN_DMA;
|
|
else if (sysfs_streq(buf, "DMA-FQ"))
|
|
req_type = IOMMU_DOMAIN_DMA_FQ;
|
|
else if (sysfs_streq(buf, "auto"))
|
|
req_type = 0;
|
|
else
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Lock/Unlock the group mutex here before device lock to
|
|
* 1. Make sure that the iommu group has only one device (this is a
|
|
* prerequisite for step 2)
|
|
* 2. Get struct *dev which is needed to lock device
|
|
*/
|
|
mutex_lock(&group->mutex);
|
|
if (iommu_group_device_count(group) != 1) {
|
|
mutex_unlock(&group->mutex);
|
|
pr_err_ratelimited("Cannot change default domain: Group has more than one device\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Since group has only one device */
|
|
grp_dev = list_first_entry(&group->devices, struct group_device, list);
|
|
dev = grp_dev->dev;
|
|
get_device(dev);
|
|
|
|
/*
|
|
* Don't hold the group mutex because taking group mutex first and then
|
|
* the device lock could potentially cause a deadlock as below. Assume
|
|
* two threads T1 and T2. T1 is trying to change default domain of an
|
|
* iommu group and T2 is trying to hot unplug a device or release [1] VF
|
|
* of a PCIe device which is in the same iommu group. T1 takes group
|
|
* mutex and before it could take device lock assume T2 has taken device
|
|
* lock and is yet to take group mutex. Now, both the threads will be
|
|
* waiting for the other thread to release lock. Below, lock order was
|
|
* suggested.
|
|
* device_lock(dev);
|
|
* mutex_lock(&group->mutex);
|
|
* iommu_change_dev_def_domain();
|
|
* mutex_unlock(&group->mutex);
|
|
* device_unlock(dev);
|
|
*
|
|
* [1] Typical device release path
|
|
* device_lock() from device/driver core code
|
|
* -> bus_notifier()
|
|
* -> iommu_bus_notifier()
|
|
* -> iommu_release_device()
|
|
* -> ops->release_device() vendor driver calls back iommu core code
|
|
* -> mutex_lock() from iommu core code
|
|
*/
|
|
mutex_unlock(&group->mutex);
|
|
|
|
/* Check if the device in the group still has a driver bound to it */
|
|
device_lock(dev);
|
|
if (device_is_bound(dev) && !(req_type == IOMMU_DOMAIN_DMA_FQ &&
|
|
group->default_domain->type == IOMMU_DOMAIN_DMA)) {
|
|
pr_err_ratelimited("Device is still bound to driver\n");
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
ret = iommu_change_dev_def_domain(group, dev, req_type);
|
|
ret = ret ?: count;
|
|
|
|
out:
|
|
device_unlock(dev);
|
|
put_device(dev);
|
|
|
|
return ret;
|
|
}
|