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3281 lines
82 KiB
3281 lines
82 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* Copyright (C) 2007-2008 Advanced Micro Devices, Inc. |
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* Author: Joerg Roedel <[email protected]> |
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*/ |
|
|
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#define pr_fmt(fmt) "iommu: " fmt |
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|
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#include <linux/device.h> |
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#include <linux/kernel.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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|
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static struct kset *iommu_group_kset; |
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static DEFINE_IDA(iommu_group_ida); |
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|
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static unsigned int iommu_def_domain_type __read_mostly; |
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static bool iommu_dma_strict __read_mostly = true; |
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static u32 iommu_cmd_line __read_mostly; |
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|
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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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|
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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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|
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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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|
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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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|
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#define IOMMU_CMD_LINE_DMA_API BIT(0) |
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|
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static void iommu_set_cmd_line_dma_api(void) |
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{ |
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iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API; |
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} |
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|
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static bool iommu_cmd_line_dma_api(void) |
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{ |
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return !!(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API); |
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} |
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|
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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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|
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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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|
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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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|
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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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/* |
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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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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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|
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static int __init iommu_subsys_init(void) |
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{ |
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bool cmd_line = iommu_cmd_line_dma_api(); |
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|
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if (!cmd_line) { |
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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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|
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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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|
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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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cmd_line ? "(set via kernel command line)" : ""); |
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|
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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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int iommu_device_register(struct iommu_device *iommu) |
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{ |
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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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|
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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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|
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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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|
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if (param) |
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return param; |
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|
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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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|
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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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|
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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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|
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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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|
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if (!ops) |
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return -ENODEV; |
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|
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if (!dev_iommu_get(dev)) |
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return -ENOMEM; |
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|
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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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|
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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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|
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dev->iommu->iommu_dev = iommu_dev; |
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|
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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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|
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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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|
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iommu_device_link(iommu_dev, dev); |
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|
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return 0; |
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|
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out_release: |
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ops->release_device(dev); |
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|
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out_module_put: |
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module_put(ops->owner); |
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|
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err_free: |
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dev_iommu_free(dev); |
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|
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return ret; |
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} |
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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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|
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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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/* |
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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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iommu_alloc_default_domain(group, dev); |
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|
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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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|
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err_out: |
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return ret; |
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|
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} |
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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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|
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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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|
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ret = kstrtobool(str, &pt); |
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if (ret) |
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return ret; |
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|
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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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|
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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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|
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static int __init iommu_dma_setup(char *str) |
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{ |
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return kstrtobool(str, &iommu_dma_strict); |
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} |
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early_param("iommu.strict", iommu_dma_setup); |
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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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|
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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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|
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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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|
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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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|
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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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|
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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 |
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* of the same type are merged. |
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*/ |
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static int iommu_insert_resv_region(struct iommu_resv_region *new, |
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struct list_head *regions) |
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{ |
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struct iommu_resv_region *iter, *tmp, *nr, *top; |
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LIST_HEAD(stack); |
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|
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nr = iommu_alloc_resv_region(new->start, new->length, |
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new->prot, new->type); |
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if (!nr) |
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return -ENOMEM; |
|
|
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/* First add the new element based on start address sorting */ |
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list_for_each_entry(iter, regions, list) { |
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if (nr->start < iter->start || |
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(nr->start == iter->start && nr->type <= iter->type)) |
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break; |
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} |
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list_add_tail(&nr->list, &iter->list); |
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|
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/* Merge overlapping segments of type nr->type in @regions, if any */ |
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list_for_each_entry_safe(iter, tmp, regions, list) { |
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phys_addr_t top_end, iter_end = iter->start + iter->length - 1; |
|
|
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/* no merge needed on elements of different types than @new */ |
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if (iter->type != new->type) { |
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list_move_tail(&iter->list, &stack); |
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continue; |
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} |
|
|
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/* look for the last stack element of same type as @iter */ |
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list_for_each_entry_reverse(top, &stack, list) |
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if (top->type == iter->type) |
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goto check_overlap; |
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|
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list_move_tail(&iter->list, &stack); |
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continue; |
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|
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check_overlap: |
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top_end = top->start + top->length - 1; |
|
|
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if (iter->start > top_end + 1) { |
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list_move_tail(&iter->list, &stack); |
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} else { |
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top->length = max(top_end, iter_end) - top->start + 1; |
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list_del(&iter->list); |
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kfree(iter); |
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} |
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} |
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list_splice(&stack, regions); |
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return 0; |
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} |
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|
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static int |
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iommu_insert_device_resv_regions(struct list_head *dev_resv_regions, |
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struct list_head *group_resv_regions) |
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{ |
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struct iommu_resv_region *entry; |
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int ret = 0; |
|
|
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list_for_each_entry(entry, dev_resv_regions, list) { |
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ret = iommu_insert_resv_region(entry, group_resv_regions); |
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if (ret) |
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break; |
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} |
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return ret; |
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} |
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|
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int iommu_get_group_resv_regions(struct iommu_group *group, |
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struct list_head *head) |
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{ |
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struct group_device *device; |
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int ret = 0; |
|
|
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mutex_lock(&group->mutex); |
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list_for_each_entry(device, &group->devices, list) { |
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struct list_head dev_resv_regions; |
|
|
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INIT_LIST_HEAD(&dev_resv_regions); |
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iommu_get_resv_regions(device->dev, &dev_resv_regions); |
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ret = iommu_insert_device_resv_regions(&dev_resv_regions, head); |
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iommu_put_resv_regions(device->dev, &dev_resv_regions); |
|
if (ret) |
|
break; |
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} |
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mutex_unlock(&group->mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); |
|
|
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static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, |
|
char *buf) |
|
{ |
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struct iommu_resv_region *region, *next; |
|
struct list_head group_resv_regions; |
|
char *str = buf; |
|
|
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INIT_LIST_HEAD(&group_resv_regions); |
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iommu_get_group_resv_regions(group, &group_resv_regions); |
|
|
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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), |
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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; |
|
} |
|
} |
|
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 || domain->type != IOMMU_DOMAIN_DMA) |
|
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; |
|
|
|
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; |
|
|
|
if (!iommu_dma_strict) { |
|
int attr = 1; |
|
iommu_domain_set_attr(dom, |
|
DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, |
|
&attr); |
|
} |
|
|
|
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; |
|
|
|
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) |
|
{ |
|
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 (unlikely(domain->ops->iova_to_phys == NULL)) |
|
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 addr_merge, size_t size) |
|
{ |
|
unsigned int pgsize_idx; |
|
size_t pgsize; |
|
|
|
/* Max page size that still fits into 'size' */ |
|
pgsize_idx = __fls(size); |
|
|
|
/* need to consider alignment requirements ? */ |
|
if (likely(addr_merge)) { |
|
/* Max page size allowed by address */ |
|
unsigned int align_pgsize_idx = __ffs(addr_merge); |
|
pgsize_idx = min(pgsize_idx, align_pgsize_idx); |
|
} |
|
|
|
/* build a mask of acceptable page sizes */ |
|
pgsize = (1UL << (pgsize_idx + 1)) - 1; |
|
|
|
/* throw away page sizes not supported by the hardware */ |
|
pgsize &= domain->pgsize_bitmap; |
|
|
|
/* make sure we're still sane */ |
|
BUG_ON(!pgsize); |
|
|
|
/* pick the biggest page */ |
|
pgsize_idx = __fls(pgsize); |
|
pgsize = 1UL << pgsize_idx; |
|
|
|
return pgsize; |
|
} |
|
|
|
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 == NULL || |
|
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 pgsize = iommu_pgsize(domain, iova | paddr, size); |
|
|
|
pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
|
iova, &paddr, pgsize); |
|
ret = ops->map(domain, iova, paddr, pgsize, prot, gfp); |
|
|
|
if (ret) |
|
break; |
|
|
|
iova += pgsize; |
|
paddr += pgsize; |
|
size -= pgsize; |
|
} |
|
|
|
/* 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(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 == NULL || |
|
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) { |
|
size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
|
|
|
unmapped_page = ops->unmap(domain, iova, pgsize, 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 size_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 0; |
|
|
|
} |
|
|
|
size_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); |
|
|
|
size_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); |
|
} |
|
|
|
int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, |
|
phys_addr_t paddr, u64 size, int prot) |
|
{ |
|
if (unlikely(domain->ops->domain_window_enable == NULL)) |
|
return -ENODEV; |
|
|
|
return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
|
prot); |
|
} |
|
EXPORT_SYMBOL_GPL(iommu_domain_window_enable); |
|
|
|
/** |
|
* 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_domain_get_attr(struct iommu_domain *domain, |
|
enum iommu_attr attr, void *data) |
|
{ |
|
struct iommu_domain_geometry *geometry; |
|
bool *paging; |
|
int ret = 0; |
|
|
|
switch (attr) { |
|
case DOMAIN_ATTR_GEOMETRY: |
|
geometry = data; |
|
*geometry = domain->geometry; |
|
|
|
break; |
|
case DOMAIN_ATTR_PAGING: |
|
paging = data; |
|
*paging = (domain->pgsize_bitmap != 0UL); |
|
break; |
|
default: |
|
if (!domain->ops->domain_get_attr) |
|
return -EINVAL; |
|
|
|
ret = domain->ops->domain_get_attr(domain, attr, data); |
|
} |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(iommu_domain_get_attr); |
|
|
|
int iommu_domain_set_attr(struct iommu_domain *domain, |
|
enum iommu_attr attr, void *data) |
|
{ |
|
int ret = 0; |
|
|
|
switch (attr) { |
|
default: |
|
if (domain->ops->domain_set_attr == NULL) |
|
return -EINVAL; |
|
|
|
ret = domain->ops->domain_set_attr(domain, attr, data); |
|
} |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
|
|
|
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_set_cmd_line_dma_api(); |
|
|
|
iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; |
|
} |
|
|
|
void iommu_set_default_translated(bool cmd_line) |
|
{ |
|
if (cmd_line) |
|
iommu_set_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; |
|
|
|
if (!group) |
|
return -EINVAL; |
|
|
|
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; |
|
} |
|
|
|
/* 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 ubind the |
|
* drivers from the devices in the iommu group. Return failure if this doesn't |
|
* meet. |
|
* |
|
* 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, "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)) { |
|
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; |
|
}
|
|
|