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3462 lines
89 KiB
C
3462 lines
89 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <jroedel@suse.de>
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*/
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#define pr_fmt(fmt) "iommu: " fmt
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#include <linux/amba/bus.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/bits.h>
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#include <linux/bug.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/host1x_context_bus.h>
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#include <linux/iommu.h>
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#include <linux/idr.h>
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#include <linux/err.h>
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#include <linux/pci.h>
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#include <linux/pci-ats.h>
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#include <linux/bitops.h>
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#include <linux/platform_device.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 <linux/cc_platform.h>
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#include <linux/cdx/cdx_bus.h>
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#include <trace/events/iommu.h>
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#include <linux/sched/mm.h>
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#include <linux/msi.h>
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#include "dma-iommu.h"
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#include "iommu-sva.h"
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static struct kset *iommu_group_kset;
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static DEFINE_IDA(iommu_group_ida);
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static DEFINE_IDA(iommu_global_pasid_ida);
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static unsigned int iommu_def_domain_type __read_mostly;
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static bool iommu_dma_strict __read_mostly = IS_ENABLED(CONFIG_IOMMU_DEFAULT_DMA_STRICT);
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static u32 iommu_cmd_line __read_mostly;
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struct iommu_group {
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struct kobject kobj;
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struct kobject *devices_kobj;
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struct list_head devices;
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struct xarray pasid_array;
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struct mutex mutex;
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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 *blocking_domain;
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struct iommu_domain *domain;
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struct list_head entry;
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unsigned int owner_cnt;
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void *owner;
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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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/* Iterate over each struct group_device in a struct iommu_group */
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#define for_each_group_device(group, pos) \
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list_for_each_entry(pos, &(group)->devices, list)
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struct iommu_group_attribute {
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struct attribute attr;
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ssize_t (*show)(struct iommu_group *group, char *buf);
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ssize_t (*store)(struct iommu_group *group,
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const char *buf, size_t count);
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};
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static const char * const iommu_group_resv_type_string[] = {
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[IOMMU_RESV_DIRECT] = "direct",
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[IOMMU_RESV_DIRECT_RELAXABLE] = "direct-relaxable",
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[IOMMU_RESV_RESERVED] = "reserved",
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[IOMMU_RESV_MSI] = "msi",
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[IOMMU_RESV_SW_MSI] = "msi",
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};
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#define IOMMU_CMD_LINE_DMA_API BIT(0)
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#define IOMMU_CMD_LINE_STRICT BIT(1)
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static int iommu_bus_notifier(struct notifier_block *nb,
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unsigned long action, void *data);
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static void iommu_release_device(struct device *dev);
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static struct iommu_domain *__iommu_domain_alloc(const 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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enum {
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IOMMU_SET_DOMAIN_MUST_SUCCEED = 1 << 0,
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};
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static int __iommu_device_set_domain(struct iommu_group *group,
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struct device *dev,
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struct iommu_domain *new_domain,
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unsigned int flags);
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static int __iommu_group_set_domain_internal(struct iommu_group *group,
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struct iommu_domain *new_domain,
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unsigned int flags);
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static int __iommu_group_set_domain(struct iommu_group *group,
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struct iommu_domain *new_domain)
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{
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return __iommu_group_set_domain_internal(group, new_domain, 0);
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}
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static void __iommu_group_set_domain_nofail(struct iommu_group *group,
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struct iommu_domain *new_domain)
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{
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WARN_ON(__iommu_group_set_domain_internal(
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group, new_domain, IOMMU_SET_DOMAIN_MUST_SUCCEED));
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}
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static int iommu_setup_default_domain(struct iommu_group *group,
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int target_type);
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static int iommu_create_device_direct_mappings(struct iommu_domain *domain,
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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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static struct group_device *iommu_group_alloc_device(struct iommu_group *group,
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struct device *dev);
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static void __iommu_group_free_device(struct iommu_group *group,
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struct group_device *grp_dev);
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#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
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struct iommu_group_attribute iommu_group_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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#define to_iommu_group_attr(_attr) \
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container_of(_attr, struct iommu_group_attribute, attr)
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#define to_iommu_group(_kobj) \
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container_of(_kobj, struct iommu_group, kobj)
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static LIST_HEAD(iommu_device_list);
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static DEFINE_SPINLOCK(iommu_device_lock);
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static struct bus_type * const iommu_buses[] = {
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&platform_bus_type,
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#ifdef CONFIG_PCI
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&pci_bus_type,
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#endif
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#ifdef CONFIG_ARM_AMBA
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&amba_bustype,
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#endif
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#ifdef CONFIG_FSL_MC_BUS
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&fsl_mc_bus_type,
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#endif
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#ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
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&host1x_context_device_bus_type,
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#endif
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#ifdef CONFIG_CDX_BUS
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&cdx_bus_type,
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#endif
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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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case IOMMU_DOMAIN_DMA_FQ:
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return "Translated";
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default:
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return "Unknown";
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}
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}
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static int __init iommu_subsys_init(void)
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{
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struct notifier_block *nb;
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if (!(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API)) {
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if (IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH))
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iommu_set_default_passthrough(false);
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else
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iommu_set_default_translated(false);
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if (iommu_default_passthrough() && cc_platform_has(CC_ATTR_MEM_ENCRYPT)) {
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pr_info("Memory encryption detected - Disabling default IOMMU Passthrough\n");
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iommu_set_default_translated(false);
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}
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}
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if (!iommu_default_passthrough() && !iommu_dma_strict)
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iommu_def_domain_type = IOMMU_DOMAIN_DMA_FQ;
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pr_info("Default domain type: %s%s\n",
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iommu_domain_type_str(iommu_def_domain_type),
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(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ?
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" (set via kernel command line)" : "");
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if (!iommu_default_passthrough())
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pr_info("DMA domain TLB invalidation policy: %s mode%s\n",
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iommu_dma_strict ? "strict" : "lazy",
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(iommu_cmd_line & IOMMU_CMD_LINE_STRICT) ?
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" (set via kernel command line)" : "");
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nb = kcalloc(ARRAY_SIZE(iommu_buses), sizeof(*nb), GFP_KERNEL);
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if (!nb)
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return -ENOMEM;
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for (int i = 0; i < ARRAY_SIZE(iommu_buses); i++) {
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nb[i].notifier_call = iommu_bus_notifier;
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bus_register_notifier(iommu_buses[i], &nb[i]);
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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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static int remove_iommu_group(struct device *dev, void *data)
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{
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if (dev->iommu && dev->iommu->iommu_dev == data)
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iommu_release_device(dev);
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return 0;
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}
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/**
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* iommu_device_register() - Register an IOMMU hardware instance
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* @iommu: IOMMU handle for the instance
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* @ops: IOMMU ops to associate with the instance
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* @hwdev: (optional) actual instance device, used for fwnode lookup
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*
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* Return: 0 on success, or an error.
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*/
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int iommu_device_register(struct iommu_device *iommu,
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const struct iommu_ops *ops, struct device *hwdev)
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{
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int err = 0;
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/* We need to be able to take module references appropriately */
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if (WARN_ON(is_module_address((unsigned long)ops) && !ops->owner))
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return -EINVAL;
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/*
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* Temporarily enforce global restriction to a single driver. This was
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* already the de-facto behaviour, since any possible combination of
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* existing drivers would compete for at least the PCI or platform bus.
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*/
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if (iommu_buses[0]->iommu_ops && iommu_buses[0]->iommu_ops != ops)
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return -EBUSY;
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iommu->ops = ops;
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if (hwdev)
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iommu->fwnode = dev_fwnode(hwdev);
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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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for (int i = 0; i < ARRAY_SIZE(iommu_buses) && !err; i++) {
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iommu_buses[i]->iommu_ops = ops;
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err = bus_iommu_probe(iommu_buses[i]);
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}
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if (err)
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iommu_device_unregister(iommu);
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return err;
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}
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EXPORT_SYMBOL_GPL(iommu_device_register);
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void iommu_device_unregister(struct iommu_device *iommu)
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{
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for (int i = 0; i < ARRAY_SIZE(iommu_buses); i++)
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bus_for_each_dev(iommu_buses[i], NULL, iommu, remove_iommu_group);
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spin_lock(&iommu_device_lock);
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list_del(&iommu->list);
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spin_unlock(&iommu_device_lock);
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}
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EXPORT_SYMBOL_GPL(iommu_device_unregister);
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static struct dev_iommu *dev_iommu_get(struct device *dev)
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{
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struct dev_iommu *param = dev->iommu;
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if (param)
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return param;
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param = kzalloc(sizeof(*param), GFP_KERNEL);
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if (!param)
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return NULL;
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mutex_init(¶m->lock);
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dev->iommu = param;
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return param;
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}
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static void dev_iommu_free(struct device *dev)
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{
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struct dev_iommu *param = dev->iommu;
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dev->iommu = NULL;
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if (param->fwspec) {
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fwnode_handle_put(param->fwspec->iommu_fwnode);
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kfree(param->fwspec);
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}
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kfree(param);
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}
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static u32 dev_iommu_get_max_pasids(struct device *dev)
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{
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u32 max_pasids = 0, bits = 0;
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int ret;
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if (dev_is_pci(dev)) {
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ret = pci_max_pasids(to_pci_dev(dev));
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if (ret > 0)
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max_pasids = ret;
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} else {
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ret = device_property_read_u32(dev, "pasid-num-bits", &bits);
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if (!ret)
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max_pasids = 1UL << bits;
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}
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return min_t(u32, max_pasids, dev->iommu->iommu_dev->max_pasids);
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}
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/*
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* Init the dev->iommu and dev->iommu_group in the struct device and get the
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* driver probed
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*/
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static int iommu_init_device(struct device *dev, const struct iommu_ops *ops)
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{
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struct iommu_device *iommu_dev;
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struct iommu_group *group;
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int ret;
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if (!dev_iommu_get(dev))
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return -ENOMEM;
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if (!try_module_get(ops->owner)) {
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ret = -EINVAL;
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goto err_free;
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}
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iommu_dev = ops->probe_device(dev);
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if (IS_ERR(iommu_dev)) {
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ret = PTR_ERR(iommu_dev);
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goto err_module_put;
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}
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ret = iommu_device_link(iommu_dev, dev);
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if (ret)
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goto err_release;
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group = ops->device_group(dev);
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if (WARN_ON_ONCE(group == NULL))
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group = ERR_PTR(-EINVAL);
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if (IS_ERR(group)) {
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ret = PTR_ERR(group);
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goto err_unlink;
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}
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dev->iommu_group = group;
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dev->iommu->iommu_dev = iommu_dev;
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dev->iommu->max_pasids = dev_iommu_get_max_pasids(dev);
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if (ops->is_attach_deferred)
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dev->iommu->attach_deferred = ops->is_attach_deferred(dev);
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return 0;
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err_unlink:
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iommu_device_unlink(iommu_dev, dev);
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err_release:
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if (ops->release_device)
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ops->release_device(dev);
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err_module_put:
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module_put(ops->owner);
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err_free:
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dev_iommu_free(dev);
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return ret;
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}
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static void iommu_deinit_device(struct device *dev)
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{
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struct iommu_group *group = dev->iommu_group;
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const struct iommu_ops *ops = dev_iommu_ops(dev);
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lockdep_assert_held(&group->mutex);
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iommu_device_unlink(dev->iommu->iommu_dev, dev);
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/*
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* release_device() must stop using any attached domain on the device.
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* If there are still other devices in the group they are not effected
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* by this callback.
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*
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* The IOMMU driver must set the device to either an identity or
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* blocking translation and stop using any domain pointer, as it is
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* going to be freed.
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*/
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if (ops->release_device)
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ops->release_device(dev);
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/*
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* If this is the last driver to use the group then we must free the
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* domains before we do the module_put().
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*/
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if (list_empty(&group->devices)) {
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if (group->default_domain) {
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iommu_domain_free(group->default_domain);
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group->default_domain = NULL;
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}
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if (group->blocking_domain) {
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iommu_domain_free(group->blocking_domain);
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group->blocking_domain = NULL;
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}
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group->domain = NULL;
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}
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/* Caller must put iommu_group */
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dev->iommu_group = NULL;
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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 __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_group *group;
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static DEFINE_MUTEX(iommu_probe_device_lock);
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struct group_device *gdev;
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int ret;
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if (!ops)
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return -ENODEV;
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/*
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* Serialise to avoid races between IOMMU drivers registering in
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* parallel and/or the "replay" calls from ACPI/OF code via client
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* driver probe. Once the latter have been cleaned up we should
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* probably be able to use device_lock() here to minimise the scope,
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* but for now enforcing a simple global ordering is fine.
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*/
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mutex_lock(&iommu_probe_device_lock);
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/* Device is probed already if in a group */
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if (dev->iommu_group) {
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ret = 0;
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goto out_unlock;
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}
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ret = iommu_init_device(dev, ops);
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if (ret)
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goto out_unlock;
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group = dev->iommu_group;
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gdev = iommu_group_alloc_device(group, dev);
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mutex_lock(&group->mutex);
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if (IS_ERR(gdev)) {
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ret = PTR_ERR(gdev);
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goto err_put_group;
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}
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|
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/*
|
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* The gdev must be in the list before calling
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* iommu_setup_default_domain()
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*/
|
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list_add_tail(&gdev->list, &group->devices);
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WARN_ON(group->default_domain && !group->domain);
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if (group->default_domain)
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iommu_create_device_direct_mappings(group->default_domain, dev);
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if (group->domain) {
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ret = __iommu_device_set_domain(group, dev, group->domain, 0);
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if (ret)
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goto err_remove_gdev;
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} else if (!group->default_domain && !group_list) {
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ret = iommu_setup_default_domain(group, 0);
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if (ret)
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goto err_remove_gdev;
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} else if (!group->default_domain) {
|
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/*
|
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* With a group_list argument we defer the default_domain setup
|
|
* to the caller by providing a de-duplicated list of groups
|
|
* that need further setup.
|
|
*/
|
|
if (list_empty(&group->entry))
|
|
list_add_tail(&group->entry, group_list);
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
mutex_unlock(&iommu_probe_device_lock);
|
|
|
|
if (dev_is_pci(dev))
|
|
iommu_dma_set_pci_32bit_workaround(dev);
|
|
|
|
return 0;
|
|
|
|
err_remove_gdev:
|
|
list_del(&gdev->list);
|
|
__iommu_group_free_device(group, gdev);
|
|
err_put_group:
|
|
iommu_deinit_device(dev);
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
out_unlock:
|
|
mutex_unlock(&iommu_probe_device_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int iommu_probe_device(struct device *dev)
|
|
{
|
|
const struct iommu_ops *ops;
|
|
int ret;
|
|
|
|
ret = __iommu_probe_device(dev, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ops = dev_iommu_ops(dev);
|
|
if (ops->probe_finalize)
|
|
ops->probe_finalize(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __iommu_group_free_device(struct iommu_group *group,
|
|
struct group_device *grp_dev)
|
|
{
|
|
struct device *dev = grp_dev->dev;
|
|
|
|
sysfs_remove_link(group->devices_kobj, grp_dev->name);
|
|
sysfs_remove_link(&dev->kobj, "iommu_group");
|
|
|
|
trace_remove_device_from_group(group->id, dev);
|
|
|
|
/*
|
|
* If the group has become empty then ownership must have been
|
|
* released, and the current domain must be set back to NULL or
|
|
* the default domain.
|
|
*/
|
|
if (list_empty(&group->devices))
|
|
WARN_ON(group->owner_cnt ||
|
|
group->domain != group->default_domain);
|
|
|
|
kfree(grp_dev->name);
|
|
kfree(grp_dev);
|
|
}
|
|
|
|
/* Remove the iommu_group from the struct device. */
|
|
static void __iommu_group_remove_device(struct device *dev)
|
|
{
|
|
struct iommu_group *group = dev->iommu_group;
|
|
struct group_device *device;
|
|
|
|
mutex_lock(&group->mutex);
|
|
for_each_group_device(group, device) {
|
|
if (device->dev != dev)
|
|
continue;
|
|
|
|
list_del(&device->list);
|
|
__iommu_group_free_device(group, device);
|
|
if (dev->iommu && dev->iommu->iommu_dev)
|
|
iommu_deinit_device(dev);
|
|
else
|
|
dev->iommu_group = NULL;
|
|
break;
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
|
|
/*
|
|
* Pairs with the get in iommu_init_device() or
|
|
* iommu_group_add_device()
|
|
*/
|
|
iommu_group_put(group);
|
|
}
|
|
|
|
static void iommu_release_device(struct device *dev)
|
|
{
|
|
struct iommu_group *group = dev->iommu_group;
|
|
|
|
if (group)
|
|
__iommu_group_remove_device(dev);
|
|
|
|
/* Free any fwspec if no iommu_driver was ever attached */
|
|
if (dev->iommu)
|
|
dev_iommu_free(dev);
|
|
}
|
|
|
|
static int __init iommu_set_def_domain_type(char *str)
|
|
{
|
|
bool pt;
|
|
int ret;
|
|
|
|
ret = kstrtobool(str, &pt);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (pt)
|
|
iommu_set_default_passthrough(true);
|
|
else
|
|
iommu_set_default_translated(true);
|
|
|
|
return 0;
|
|
}
|
|
early_param("iommu.passthrough", iommu_set_def_domain_type);
|
|
|
|
static int __init iommu_dma_setup(char *str)
|
|
{
|
|
int ret = kstrtobool(str, &iommu_dma_strict);
|
|
|
|
if (!ret)
|
|
iommu_cmd_line |= IOMMU_CMD_LINE_STRICT;
|
|
return ret;
|
|
}
|
|
early_param("iommu.strict", iommu_dma_setup);
|
|
|
|
void iommu_set_dma_strict(void)
|
|
{
|
|
iommu_dma_strict = true;
|
|
if (iommu_def_domain_type == IOMMU_DOMAIN_DMA_FQ)
|
|
iommu_def_domain_type = IOMMU_DOMAIN_DMA;
|
|
}
|
|
|
|
static ssize_t iommu_group_attr_show(struct kobject *kobj,
|
|
struct attribute *__attr, char *buf)
|
|
{
|
|
struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
|
|
struct iommu_group *group = to_iommu_group(kobj);
|
|
ssize_t ret = -EIO;
|
|
|
|
if (attr->show)
|
|
ret = attr->show(group, buf);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t iommu_group_attr_store(struct kobject *kobj,
|
|
struct attribute *__attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
|
|
struct iommu_group *group = to_iommu_group(kobj);
|
|
ssize_t ret = -EIO;
|
|
|
|
if (attr->store)
|
|
ret = attr->store(group, buf, count);
|
|
return ret;
|
|
}
|
|
|
|
static const struct sysfs_ops iommu_group_sysfs_ops = {
|
|
.show = iommu_group_attr_show,
|
|
.store = iommu_group_attr_store,
|
|
};
|
|
|
|
static int iommu_group_create_file(struct iommu_group *group,
|
|
struct iommu_group_attribute *attr)
|
|
{
|
|
return sysfs_create_file(&group->kobj, &attr->attr);
|
|
}
|
|
|
|
static void iommu_group_remove_file(struct iommu_group *group,
|
|
struct iommu_group_attribute *attr)
|
|
{
|
|
sysfs_remove_file(&group->kobj, &attr->attr);
|
|
}
|
|
|
|
static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
|
|
{
|
|
return sysfs_emit(buf, "%s\n", group->name);
|
|
}
|
|
|
|
/**
|
|
* iommu_insert_resv_region - Insert a new region in the
|
|
* list of reserved regions.
|
|
* @new: new region to insert
|
|
* @regions: list of regions
|
|
*
|
|
* Elements are sorted by start address and overlapping segments
|
|
* of the same type are merged.
|
|
*/
|
|
static int iommu_insert_resv_region(struct iommu_resv_region *new,
|
|
struct list_head *regions)
|
|
{
|
|
struct iommu_resv_region *iter, *tmp, *nr, *top;
|
|
LIST_HEAD(stack);
|
|
|
|
nr = iommu_alloc_resv_region(new->start, new->length,
|
|
new->prot, new->type, GFP_KERNEL);
|
|
if (!nr)
|
|
return -ENOMEM;
|
|
|
|
/* First add the new element based on start address sorting */
|
|
list_for_each_entry(iter, regions, list) {
|
|
if (nr->start < iter->start ||
|
|
(nr->start == iter->start && nr->type <= iter->type))
|
|
break;
|
|
}
|
|
list_add_tail(&nr->list, &iter->list);
|
|
|
|
/* Merge overlapping segments of type nr->type in @regions, if any */
|
|
list_for_each_entry_safe(iter, tmp, regions, list) {
|
|
phys_addr_t top_end, iter_end = iter->start + iter->length - 1;
|
|
|
|
/* no merge needed on elements of different types than @new */
|
|
if (iter->type != new->type) {
|
|
list_move_tail(&iter->list, &stack);
|
|
continue;
|
|
}
|
|
|
|
/* look for the last stack element of same type as @iter */
|
|
list_for_each_entry_reverse(top, &stack, list)
|
|
if (top->type == iter->type)
|
|
goto check_overlap;
|
|
|
|
list_move_tail(&iter->list, &stack);
|
|
continue;
|
|
|
|
check_overlap:
|
|
top_end = top->start + top->length - 1;
|
|
|
|
if (iter->start > top_end + 1) {
|
|
list_move_tail(&iter->list, &stack);
|
|
} else {
|
|
top->length = max(top_end, iter_end) - top->start + 1;
|
|
list_del(&iter->list);
|
|
kfree(iter);
|
|
}
|
|
}
|
|
list_splice(&stack, regions);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
|
|
struct list_head *group_resv_regions)
|
|
{
|
|
struct iommu_resv_region *entry;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(entry, dev_resv_regions, list) {
|
|
ret = iommu_insert_resv_region(entry, group_resv_regions);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int iommu_get_group_resv_regions(struct iommu_group *group,
|
|
struct list_head *head)
|
|
{
|
|
struct group_device *device;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&group->mutex);
|
|
for_each_group_device(group, device) {
|
|
struct list_head dev_resv_regions;
|
|
|
|
/*
|
|
* Non-API groups still expose reserved_regions in sysfs,
|
|
* so filter out calls that get here that way.
|
|
*/
|
|
if (!device->dev->iommu)
|
|
break;
|
|
|
|
INIT_LIST_HEAD(&dev_resv_regions);
|
|
iommu_get_resv_regions(device->dev, &dev_resv_regions);
|
|
ret = iommu_insert_device_resv_regions(&dev_resv_regions, head);
|
|
iommu_put_resv_regions(device->dev, &dev_resv_regions);
|
|
if (ret)
|
|
break;
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);
|
|
|
|
static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
|
|
char *buf)
|
|
{
|
|
struct iommu_resv_region *region, *next;
|
|
struct list_head group_resv_regions;
|
|
int offset = 0;
|
|
|
|
INIT_LIST_HEAD(&group_resv_regions);
|
|
iommu_get_group_resv_regions(group, &group_resv_regions);
|
|
|
|
list_for_each_entry_safe(region, next, &group_resv_regions, list) {
|
|
offset += sysfs_emit_at(buf, offset, "0x%016llx 0x%016llx %s\n",
|
|
(long long)region->start,
|
|
(long long)(region->start +
|
|
region->length - 1),
|
|
iommu_group_resv_type_string[region->type]);
|
|
kfree(region);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static ssize_t iommu_group_show_type(struct iommu_group *group,
|
|
char *buf)
|
|
{
|
|
char *type = "unknown";
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (group->default_domain) {
|
|
switch (group->default_domain->type) {
|
|
case IOMMU_DOMAIN_BLOCKED:
|
|
type = "blocked";
|
|
break;
|
|
case IOMMU_DOMAIN_IDENTITY:
|
|
type = "identity";
|
|
break;
|
|
case IOMMU_DOMAIN_UNMANAGED:
|
|
type = "unmanaged";
|
|
break;
|
|
case IOMMU_DOMAIN_DMA:
|
|
type = "DMA";
|
|
break;
|
|
case IOMMU_DOMAIN_DMA_FQ:
|
|
type = "DMA-FQ";
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
|
|
return sysfs_emit(buf, "%s\n", 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_free(&iommu_group_ida, group->id);
|
|
|
|
/* Domains are free'd by iommu_deinit_device() */
|
|
WARN_ON(group->default_domain);
|
|
WARN_ON(group->blocking_domain);
|
|
|
|
kfree(group->name);
|
|
kfree(group);
|
|
}
|
|
|
|
static const 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);
|
|
xa_init(&group->pasid_array);
|
|
|
|
ret = ida_alloc(&iommu_group_ida, 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) {
|
|
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) {
|
|
kobject_put(group->devices_kobj);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
ret = iommu_group_create_file(group, &iommu_group_attr_type);
|
|
if (ret) {
|
|
kobject_put(group->devices_kobj);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
pr_debug("Allocated group %d\n", group->id);
|
|
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_alloc);
|
|
|
|
/**
|
|
* 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_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
struct iommu_resv_region *entry;
|
|
struct list_head mappings;
|
|
unsigned long pg_size;
|
|
int ret = 0;
|
|
|
|
pg_size = domain->pgsize_bitmap ? 1UL << __ffs(domain->pgsize_bitmap) : 0;
|
|
INIT_LIST_HEAD(&mappings);
|
|
|
|
if (WARN_ON_ONCE(iommu_is_dma_domain(domain) && !pg_size))
|
|
return -EINVAL;
|
|
|
|
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 (entry->type == IOMMU_RESV_DIRECT)
|
|
dev->iommu->require_direct = 1;
|
|
|
|
if ((entry->type != IOMMU_RESV_DIRECT &&
|
|
entry->type != IOMMU_RESV_DIRECT_RELAXABLE) ||
|
|
!iommu_is_dma_domain(domain))
|
|
continue;
|
|
|
|
start = ALIGN(entry->start, pg_size);
|
|
end = ALIGN(entry->start + entry->length, pg_size);
|
|
|
|
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, GFP_KERNEL);
|
|
if (ret)
|
|
goto out;
|
|
map_size = 0;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
iommu_flush_iotlb_all(domain);
|
|
|
|
out:
|
|
iommu_put_resv_regions(dev, &mappings);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* This is undone by __iommu_group_free_device() */
|
|
static struct group_device *iommu_group_alloc_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 ERR_PTR(-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;
|
|
}
|
|
|
|
trace_add_device_to_group(group->id, dev);
|
|
|
|
dev_info(dev, "Adding to iommu group %d\n", group->id);
|
|
|
|
return device;
|
|
|
|
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 ERR_PTR(ret);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct group_device *gdev;
|
|
|
|
gdev = iommu_group_alloc_device(group, dev);
|
|
if (IS_ERR(gdev))
|
|
return PTR_ERR(gdev);
|
|
|
|
iommu_group_ref_get(group);
|
|
dev->iommu_group = group;
|
|
|
|
mutex_lock(&group->mutex);
|
|
list_add_tail(&gdev->list, &group->devices);
|
|
mutex_unlock(&group->mutex);
|
|
return 0;
|
|
}
|
|
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;
|
|
|
|
if (!group)
|
|
return;
|
|
|
|
dev_info(dev, "Removing from iommu group %d\n", group->id);
|
|
|
|
__iommu_group_remove_device(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_remove_device);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
int iommu_group_for_each_dev(struct iommu_group *group, void *data,
|
|
int (*fn)(struct device *, void *))
|
|
{
|
|
struct group_device *device;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&group->mutex);
|
|
for_each_group_device(group, device) {
|
|
ret = fn(device->dev, data);
|
|
if (ret)
|
|
break;
|
|
}
|
|
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_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;
|
|
const struct iommu_ops *ops = dev_iommu_ops(dev);
|
|
bool has_pasid = msg->flags & IOMMU_PAGE_RESP_PASID_VALID;
|
|
|
|
if (!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 = 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_iommu_ops(dev);
|
|
|
|
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 struct iommu_domain *
|
|
__iommu_group_alloc_default_domain(const struct bus_type *bus,
|
|
struct iommu_group *group, int req_type)
|
|
{
|
|
if (group->default_domain && group->default_domain->type == req_type)
|
|
return group->default_domain;
|
|
return __iommu_domain_alloc(bus, req_type);
|
|
}
|
|
|
|
/*
|
|
* req_type of 0 means "auto" which means to select a domain based on
|
|
* iommu_def_domain_type or what the driver actually supports.
|
|
*/
|
|
static struct iommu_domain *
|
|
iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
|
|
{
|
|
const struct bus_type *bus =
|
|
list_first_entry(&group->devices, struct group_device, list)
|
|
->dev->bus;
|
|
struct iommu_domain *dom;
|
|
|
|
lockdep_assert_held(&group->mutex);
|
|
|
|
if (req_type)
|
|
return __iommu_group_alloc_default_domain(bus, group, req_type);
|
|
|
|
/* The driver gave no guidance on what type to use, try the default */
|
|
dom = __iommu_group_alloc_default_domain(bus, group, iommu_def_domain_type);
|
|
if (dom)
|
|
return dom;
|
|
|
|
/* Otherwise IDENTITY and DMA_FQ defaults will try DMA */
|
|
if (iommu_def_domain_type == IOMMU_DOMAIN_DMA)
|
|
return NULL;
|
|
dom = __iommu_group_alloc_default_domain(bus, group, IOMMU_DOMAIN_DMA);
|
|
if (!dom)
|
|
return NULL;
|
|
|
|
pr_warn("Failed to allocate default IOMMU domain of type %u for group %s - Falling back to IOMMU_DOMAIN_DMA",
|
|
iommu_def_domain_type, group->name);
|
|
return dom;
|
|
}
|
|
|
|
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;
|
|
int ret;
|
|
|
|
ret = __iommu_probe_device(dev, group_list);
|
|
if (ret == -ENODEV)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int iommu_bus_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct device *dev = data;
|
|
|
|
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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* A target_type of 0 will select the best domain type and cannot fail */
|
|
static int iommu_get_default_domain_type(struct iommu_group *group,
|
|
int target_type)
|
|
{
|
|
int best_type = target_type;
|
|
struct group_device *gdev;
|
|
struct device *last_dev;
|
|
|
|
lockdep_assert_held(&group->mutex);
|
|
|
|
for_each_group_device(group, gdev) {
|
|
unsigned int type = iommu_get_def_domain_type(gdev->dev);
|
|
|
|
if (best_type && type && best_type != type) {
|
|
if (target_type) {
|
|
dev_err_ratelimited(
|
|
gdev->dev,
|
|
"Device cannot be in %s domain\n",
|
|
iommu_domain_type_str(target_type));
|
|
return -1;
|
|
}
|
|
|
|
dev_warn(
|
|
gdev->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(last_dev),
|
|
iommu_domain_type_str(best_type));
|
|
return 0;
|
|
}
|
|
if (!best_type)
|
|
best_type = type;
|
|
last_dev = gdev->dev;
|
|
}
|
|
return best_type;
|
|
}
|
|
|
|
static void iommu_group_do_probe_finalize(struct device *dev)
|
|
{
|
|
const struct iommu_ops *ops = dev_iommu_ops(dev);
|
|
|
|
if (ops->probe_finalize)
|
|
ops->probe_finalize(dev);
|
|
}
|
|
|
|
int bus_iommu_probe(const struct bus_type *bus)
|
|
{
|
|
struct iommu_group *group, *next;
|
|
LIST_HEAD(group_list);
|
|
int ret;
|
|
|
|
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) {
|
|
struct group_device *gdev;
|
|
|
|
mutex_lock(&group->mutex);
|
|
|
|
/* Remove item from the list */
|
|
list_del_init(&group->entry);
|
|
|
|
/*
|
|
* We go to the trouble of deferred default domain creation so
|
|
* that the cross-group default domain type and the setup of the
|
|
* IOMMU_RESV_DIRECT will work correctly in non-hotpug scenarios.
|
|
*/
|
|
ret = iommu_setup_default_domain(group, 0);
|
|
if (ret) {
|
|
mutex_unlock(&group->mutex);
|
|
return ret;
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
|
|
/*
|
|
* FIXME: Mis-locked because the ops->probe_finalize() call-back
|
|
* of some 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.
|
|
*/
|
|
for_each_group_device(group, gdev)
|
|
iommu_group_do_probe_finalize(gdev->dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool iommu_present(const struct bus_type *bus)
|
|
{
|
|
return bus->iommu_ops != NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_present);
|
|
|
|
/**
|
|
* device_iommu_capable() - check for a general IOMMU capability
|
|
* @dev: device to which the capability would be relevant, if available
|
|
* @cap: IOMMU capability
|
|
*
|
|
* Return: true if an IOMMU is present and supports the given capability
|
|
* for the given device, otherwise false.
|
|
*/
|
|
bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
|
|
{
|
|
const struct iommu_ops *ops;
|
|
|
|
if (!dev->iommu || !dev->iommu->iommu_dev)
|
|
return false;
|
|
|
|
ops = dev_iommu_ops(dev);
|
|
if (!ops->capable)
|
|
return false;
|
|
|
|
return ops->capable(dev, cap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_iommu_capable);
|
|
|
|
/**
|
|
* iommu_group_has_isolated_msi() - Compute msi_device_has_isolated_msi()
|
|
* for a group
|
|
* @group: Group to query
|
|
*
|
|
* IOMMU groups should not have differing values of
|
|
* msi_device_has_isolated_msi() for devices in a group. However nothing
|
|
* directly prevents this, so ensure mistakes don't result in isolation failures
|
|
* by checking that all the devices are the same.
|
|
*/
|
|
bool iommu_group_has_isolated_msi(struct iommu_group *group)
|
|
{
|
|
struct group_device *group_dev;
|
|
bool ret = true;
|
|
|
|
mutex_lock(&group->mutex);
|
|
for_each_group_device(group, group_dev)
|
|
ret &= msi_device_has_isolated_msi(group_dev->dev);
|
|
mutex_unlock(&group->mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_has_isolated_msi);
|
|
|
|
/**
|
|
* 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(const struct bus_type *bus,
|
|
unsigned type)
|
|
{
|
|
struct iommu_domain *domain;
|
|
unsigned int alloc_type = type & IOMMU_DOMAIN_ALLOC_FLAGS;
|
|
|
|
if (bus == NULL || bus->iommu_ops == NULL)
|
|
return NULL;
|
|
|
|
domain = bus->iommu_ops->domain_alloc(alloc_type);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
domain->type = type;
|
|
/*
|
|
* If not already set, assume all sizes by default; the driver
|
|
* may override this later
|
|
*/
|
|
if (!domain->pgsize_bitmap)
|
|
domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap;
|
|
|
|
if (!domain->ops)
|
|
domain->ops = bus->iommu_ops->default_domain_ops;
|
|
|
|
if (iommu_is_dma_domain(domain) && iommu_get_dma_cookie(domain)) {
|
|
iommu_domain_free(domain);
|
|
domain = NULL;
|
|
}
|
|
return domain;
|
|
}
|
|
|
|
struct iommu_domain *iommu_domain_alloc(const 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)
|
|
{
|
|
if (domain->type == IOMMU_DOMAIN_SVA)
|
|
mmdrop(domain->mm);
|
|
iommu_put_dma_cookie(domain);
|
|
domain->ops->free(domain);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_free);
|
|
|
|
/*
|
|
* Put the group's domain back to the appropriate core-owned domain - either the
|
|
* standard kernel-mode DMA configuration or an all-DMA-blocked domain.
|
|
*/
|
|
static void __iommu_group_set_core_domain(struct iommu_group *group)
|
|
{
|
|
struct iommu_domain *new_domain;
|
|
|
|
if (group->owner)
|
|
new_domain = group->blocking_domain;
|
|
else
|
|
new_domain = group->default_domain;
|
|
|
|
__iommu_group_set_domain_nofail(group, new_domain);
|
|
}
|
|
|
|
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)
|
|
return ret;
|
|
dev->iommu->attach_deferred = 0;
|
|
trace_attach_device_to_domain(dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iommu_attach_device - Attach an IOMMU domain to a device
|
|
* @domain: IOMMU domain to attach
|
|
* @dev: Device that will be attached
|
|
*
|
|
* Returns 0 on success and error code on failure
|
|
*
|
|
* Note that EINVAL can be treated as a soft failure, indicating
|
|
* that certain configuration of the domain is incompatible with
|
|
* the device. In this case attaching a different domain to the
|
|
* device may succeed.
|
|
*/
|
|
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 (list_count_nodes(&group->devices) != 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)
|
|
{
|
|
if (dev->iommu && dev->iommu->attach_deferred)
|
|
return __iommu_attach_device(domain, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 (WARN_ON(domain != group->domain) ||
|
|
WARN_ON(list_count_nodes(&group->devices) != 1))
|
|
goto out_unlock;
|
|
__iommu_group_set_core_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;
|
|
}
|
|
|
|
static int __iommu_attach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group)
|
|
{
|
|
if (group->domain && group->domain != group->default_domain &&
|
|
group->domain != group->blocking_domain)
|
|
return -EBUSY;
|
|
|
|
return __iommu_group_set_domain(group, domain);
|
|
}
|
|
|
|
/**
|
|
* iommu_attach_group - Attach an IOMMU domain to an IOMMU group
|
|
* @domain: IOMMU domain to attach
|
|
* @group: IOMMU group that will be attached
|
|
*
|
|
* Returns 0 on success and error code on failure
|
|
*
|
|
* Note that EINVAL can be treated as a soft failure, indicating
|
|
* that certain configuration of the domain is incompatible with
|
|
* the group. In this case attaching a different domain to the
|
|
* group may succeed.
|
|
*/
|
|
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_device_set_domain(struct iommu_group *group,
|
|
struct device *dev,
|
|
struct iommu_domain *new_domain,
|
|
unsigned int flags)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* If the device requires IOMMU_RESV_DIRECT then we cannot allow
|
|
* the blocking domain to be attached as it does not contain the
|
|
* required 1:1 mapping. This test effectively excludes the device
|
|
* being used with iommu_group_claim_dma_owner() which will block
|
|
* vfio and iommufd as well.
|
|
*/
|
|
if (dev->iommu->require_direct &&
|
|
(new_domain->type == IOMMU_DOMAIN_BLOCKED ||
|
|
new_domain == group->blocking_domain)) {
|
|
dev_warn(dev,
|
|
"Firmware has requested this device have a 1:1 IOMMU mapping, rejecting configuring the device without a 1:1 mapping. Contact your platform vendor.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dev->iommu->attach_deferred) {
|
|
if (new_domain == group->default_domain)
|
|
return 0;
|
|
dev->iommu->attach_deferred = 0;
|
|
}
|
|
|
|
ret = __iommu_attach_device(new_domain, dev);
|
|
if (ret) {
|
|
/*
|
|
* If we have a blocking domain then try to attach that in hopes
|
|
* of avoiding a UAF. Modern drivers should implement blocking
|
|
* domains as global statics that cannot fail.
|
|
*/
|
|
if ((flags & IOMMU_SET_DOMAIN_MUST_SUCCEED) &&
|
|
group->blocking_domain &&
|
|
group->blocking_domain != new_domain)
|
|
__iommu_attach_device(group->blocking_domain, dev);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If 0 is returned the group's domain is new_domain. If an error is returned
|
|
* then the group's domain will be set back to the existing domain unless
|
|
* IOMMU_SET_DOMAIN_MUST_SUCCEED, otherwise an error is returned and the group's
|
|
* domains is left inconsistent. This is a driver bug to fail attach with a
|
|
* previously good domain. We try to avoid a kernel UAF because of this.
|
|
*
|
|
* 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_set_domain_internal(struct iommu_group *group,
|
|
struct iommu_domain *new_domain,
|
|
unsigned int flags)
|
|
{
|
|
struct group_device *last_gdev;
|
|
struct group_device *gdev;
|
|
int result;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&group->mutex);
|
|
|
|
if (group->domain == new_domain)
|
|
return 0;
|
|
|
|
/*
|
|
* New drivers should support default domains, so set_platform_dma()
|
|
* op will never be called. Otherwise the NULL domain represents some
|
|
* platform specific behavior.
|
|
*/
|
|
if (!new_domain) {
|
|
for_each_group_device(group, gdev) {
|
|
const struct iommu_ops *ops = dev_iommu_ops(gdev->dev);
|
|
|
|
if (!WARN_ON(!ops->set_platform_dma_ops))
|
|
ops->set_platform_dma_ops(gdev->dev);
|
|
}
|
|
group->domain = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Changing the domain is done by calling attach_dev() on the new
|
|
* domain. This switch does not have to be atomic and DMA can be
|
|
* discarded during the transition. DMA must only be able to access
|
|
* either new_domain or group->domain, never something else.
|
|
*/
|
|
result = 0;
|
|
for_each_group_device(group, gdev) {
|
|
ret = __iommu_device_set_domain(group, gdev->dev, new_domain,
|
|
flags);
|
|
if (ret) {
|
|
result = ret;
|
|
/*
|
|
* Keep trying the other devices in the group. If a
|
|
* driver fails attach to an otherwise good domain, and
|
|
* does not support blocking domains, it should at least
|
|
* drop its reference on the current domain so we don't
|
|
* UAF.
|
|
*/
|
|
if (flags & IOMMU_SET_DOMAIN_MUST_SUCCEED)
|
|
continue;
|
|
goto err_revert;
|
|
}
|
|
}
|
|
group->domain = new_domain;
|
|
return result;
|
|
|
|
err_revert:
|
|
/*
|
|
* This is called in error unwind paths. A well behaved driver should
|
|
* always allow us to attach to a domain that was already attached.
|
|
*/
|
|
last_gdev = gdev;
|
|
for_each_group_device(group, gdev) {
|
|
const struct iommu_ops *ops = dev_iommu_ops(gdev->dev);
|
|
|
|
/*
|
|
* If set_platform_dma_ops is not present a NULL domain can
|
|
* happen only for first probe, in which case we leave
|
|
* group->domain as NULL and let release clean everything up.
|
|
*/
|
|
if (group->domain)
|
|
WARN_ON(__iommu_device_set_domain(
|
|
group, gdev->dev, group->domain,
|
|
IOMMU_SET_DOMAIN_MUST_SUCCEED));
|
|
else if (ops->set_platform_dma_ops)
|
|
ops->set_platform_dma_ops(gdev->dev);
|
|
if (gdev == last_gdev)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
|
|
{
|
|
mutex_lock(&group->mutex);
|
|
__iommu_group_set_core_domain(group);
|
|
mutex_unlock(&group->mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_detach_group);
|
|
|
|
phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
|
|
{
|
|
if (domain->type == IOMMU_DOMAIN_IDENTITY)
|
|
return iova;
|
|
|
|
if (domain->type == IOMMU_DOMAIN_BLOCKED)
|
|
return 0;
|
|
|
|
return domain->ops->iova_to_phys(domain, iova);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
|
|
|
|
static size_t iommu_pgsize(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, size_t *count)
|
|
{
|
|
unsigned int pgsize_idx, pgsize_idx_next;
|
|
unsigned long pgsizes;
|
|
size_t offset, pgsize, pgsize_next;
|
|
unsigned long addr_merge = paddr | iova;
|
|
|
|
/* Page sizes supported by the hardware and small enough for @size */
|
|
pgsizes = domain->pgsize_bitmap & GENMASK(__fls(size), 0);
|
|
|
|
/* Constrain the page sizes further based on the maximum alignment */
|
|
if (likely(addr_merge))
|
|
pgsizes &= GENMASK(__ffs(addr_merge), 0);
|
|
|
|
/* Make sure we have at least one suitable page size */
|
|
BUG_ON(!pgsizes);
|
|
|
|
/* Pick the biggest page size remaining */
|
|
pgsize_idx = __fls(pgsizes);
|
|
pgsize = BIT(pgsize_idx);
|
|
if (!count)
|
|
return pgsize;
|
|
|
|
/* Find the next biggest support page size, if it exists */
|
|
pgsizes = domain->pgsize_bitmap & ~GENMASK(pgsize_idx, 0);
|
|
if (!pgsizes)
|
|
goto out_set_count;
|
|
|
|
pgsize_idx_next = __ffs(pgsizes);
|
|
pgsize_next = BIT(pgsize_idx_next);
|
|
|
|
/*
|
|
* There's no point trying a bigger page size unless the virtual
|
|
* and physical addresses are similarly offset within the larger page.
|
|
*/
|
|
if ((iova ^ paddr) & (pgsize_next - 1))
|
|
goto out_set_count;
|
|
|
|
/* Calculate the offset to the next page size alignment boundary */
|
|
offset = pgsize_next - (addr_merge & (pgsize_next - 1));
|
|
|
|
/*
|
|
* If size is big enough to accommodate the larger page, reduce
|
|
* the number of smaller pages.
|
|
*/
|
|
if (offset + pgsize_next <= size)
|
|
size = offset;
|
|
|
|
out_set_count:
|
|
*count = size >> pgsize_idx;
|
|
return pgsize;
|
|
}
|
|
|
|
static int __iommu_map_pages(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot,
|
|
gfp_t gfp, size_t *mapped)
|
|
{
|
|
const struct iommu_domain_ops *ops = domain->ops;
|
|
size_t pgsize, count;
|
|
int ret;
|
|
|
|
pgsize = iommu_pgsize(domain, iova, paddr, size, &count);
|
|
|
|
pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx count %zu\n",
|
|
iova, &paddr, pgsize, count);
|
|
|
|
if (ops->map_pages) {
|
|
ret = ops->map_pages(domain, iova, paddr, pgsize, count, prot,
|
|
gfp, mapped);
|
|
} else {
|
|
ret = ops->map(domain, iova, paddr, pgsize, prot, gfp);
|
|
*mapped = ret ? 0 : pgsize;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
|
|
{
|
|
const struct iommu_domain_ops *ops = domain->ops;
|
|
unsigned long orig_iova = iova;
|
|
unsigned int min_pagesz;
|
|
size_t orig_size = size;
|
|
phys_addr_t orig_paddr = paddr;
|
|
int ret = 0;
|
|
|
|
if (unlikely(!(ops->map || ops->map_pages) ||
|
|
domain->pgsize_bitmap == 0UL))
|
|
return -ENODEV;
|
|
|
|
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
|
|
return -EINVAL;
|
|
|
|
/* find out the minimum page size supported */
|
|
min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
|
|
|
|
/*
|
|
* both the virtual address and the physical one, as well as
|
|
* the size of the mapping, must be aligned (at least) to the
|
|
* size of the smallest page supported by the hardware
|
|
*/
|
|
if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
|
|
pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
|
|
iova, &paddr, size, min_pagesz);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size);
|
|
|
|
while (size) {
|
|
size_t mapped = 0;
|
|
|
|
ret = __iommu_map_pages(domain, iova, paddr, size, prot, gfp,
|
|
&mapped);
|
|
/*
|
|
* Some pages may have been mapped, even if an error occurred,
|
|
* so we should account for those so they can be unmapped.
|
|
*/
|
|
size -= mapped;
|
|
|
|
if (ret)
|
|
break;
|
|
|
|
iova += mapped;
|
|
paddr += mapped;
|
|
}
|
|
|
|
/* unroll mapping in case something went wrong */
|
|
if (ret)
|
|
iommu_unmap(domain, orig_iova, orig_size - size);
|
|
else
|
|
trace_map(orig_iova, orig_paddr, orig_size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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_domain_ops *ops = domain->ops;
|
|
int ret;
|
|
|
|
might_sleep_if(gfpflags_allow_blocking(gfp));
|
|
|
|
/* Discourage passing strange GFP flags */
|
|
if (WARN_ON_ONCE(gfp & (__GFP_COMP | __GFP_DMA | __GFP_DMA32 |
|
|
__GFP_HIGHMEM)))
|
|
return -EINVAL;
|
|
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_map);
|
|
|
|
static size_t __iommu_unmap_pages(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size,
|
|
struct iommu_iotlb_gather *iotlb_gather)
|
|
{
|
|
const struct iommu_domain_ops *ops = domain->ops;
|
|
size_t pgsize, count;
|
|
|
|
pgsize = iommu_pgsize(domain, iova, iova, size, &count);
|
|
return ops->unmap_pages ?
|
|
ops->unmap_pages(domain, iova, pgsize, count, iotlb_gather) :
|
|
ops->unmap(domain, iova, pgsize, iotlb_gather);
|
|
}
|
|
|
|
static size_t __iommu_unmap(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size,
|
|
struct iommu_iotlb_gather *iotlb_gather)
|
|
{
|
|
const struct iommu_domain_ops *ops = domain->ops;
|
|
size_t unmapped_page, unmapped = 0;
|
|
unsigned long orig_iova = iova;
|
|
unsigned int min_pagesz;
|
|
|
|
if (unlikely(!(ops->unmap || ops->unmap_pages) ||
|
|
domain->pgsize_bitmap == 0UL))
|
|
return 0;
|
|
|
|
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
|
|
return 0;
|
|
|
|
/* find out the minimum page size supported */
|
|
min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
|
|
|
|
/*
|
|
* The virtual address, as well as the size of the mapping, must be
|
|
* aligned (at least) to the size of the smallest page supported
|
|
* by the hardware
|
|
*/
|
|
if (!IS_ALIGNED(iova | size, min_pagesz)) {
|
|
pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
|
|
iova, size, min_pagesz);
|
|
return 0;
|
|
}
|
|
|
|
pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);
|
|
|
|
/*
|
|
* Keep iterating until we either unmap 'size' bytes (or more)
|
|
* or we hit an area that isn't mapped.
|
|
*/
|
|
while (unmapped < size) {
|
|
unmapped_page = __iommu_unmap_pages(domain, iova,
|
|
size - unmapped,
|
|
iotlb_gather);
|
|
if (!unmapped_page)
|
|
break;
|
|
|
|
pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
|
|
iova, unmapped_page);
|
|
|
|
iova += unmapped_page;
|
|
unmapped += unmapped_page;
|
|
}
|
|
|
|
trace_unmap(orig_iova, size, unmapped);
|
|
return unmapped;
|
|
}
|
|
|
|
size_t iommu_unmap(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size)
|
|
{
|
|
struct iommu_iotlb_gather iotlb_gather;
|
|
size_t ret;
|
|
|
|
iommu_iotlb_gather_init(&iotlb_gather);
|
|
ret = __iommu_unmap(domain, iova, size, &iotlb_gather);
|
|
iommu_iotlb_sync(domain, &iotlb_gather);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unmap);
|
|
|
|
size_t iommu_unmap_fast(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size,
|
|
struct iommu_iotlb_gather *iotlb_gather)
|
|
{
|
|
return __iommu_unmap(domain, iova, size, iotlb_gather);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unmap_fast);
|
|
|
|
ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
|
|
struct scatterlist *sg, unsigned int nents, int prot,
|
|
gfp_t gfp)
|
|
{
|
|
const struct iommu_domain_ops *ops = domain->ops;
|
|
size_t len = 0, mapped = 0;
|
|
phys_addr_t start;
|
|
unsigned int i = 0;
|
|
int ret;
|
|
|
|
might_sleep_if(gfpflags_allow_blocking(gfp));
|
|
|
|
/* Discourage passing strange GFP flags */
|
|
if (WARN_ON_ONCE(gfp & (__GFP_COMP | __GFP_DMA | __GFP_DMA32 |
|
|
__GFP_HIGHMEM)))
|
|
return -EINVAL;
|
|
|
|
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 (sg_dma_is_bus_address(sg))
|
|
goto next;
|
|
|
|
if (len) {
|
|
len += sg->length;
|
|
} else {
|
|
len = sg->length;
|
|
start = s_phys;
|
|
}
|
|
|
|
next:
|
|
if (++i < nents)
|
|
sg = sg_next(sg);
|
|
}
|
|
|
|
if (ops->iotlb_sync_map)
|
|
ops->iotlb_sync_map(domain, iova, mapped);
|
|
return mapped;
|
|
|
|
out_err:
|
|
/* undo mappings already done */
|
|
iommu_unmap(domain, iova, mapped);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_map_sg);
|
|
|
|
/**
|
|
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
|
|
* @domain: the iommu domain where the fault has happened
|
|
* @dev: the device where the fault has happened
|
|
* @iova: the faulting address
|
|
* @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
|
|
*
|
|
* This function should be called by the low-level IOMMU implementations
|
|
* whenever IOMMU faults happen, to allow high-level users, that are
|
|
* interested in such events, to know about them.
|
|
*
|
|
* This event may be useful for several possible use cases:
|
|
* - mere logging of the event
|
|
* - dynamic TLB/PTE loading
|
|
* - if restarting of the faulting device is required
|
|
*
|
|
* Returns 0 on success and an appropriate error code otherwise (if dynamic
|
|
* PTE/TLB loading will one day be supported, implementations will be able
|
|
* to tell whether it succeeded or not according to this return value).
|
|
*
|
|
* Specifically, -ENOSYS is returned if a fault handler isn't installed
|
|
* (though fault handlers can also return -ENOSYS, in case they want to
|
|
* elicit the default behavior of the IOMMU drivers).
|
|
*/
|
|
int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
|
|
unsigned long iova, int flags)
|
|
{
|
|
int ret = -ENOSYS;
|
|
|
|
/*
|
|
* if upper layers showed interest and installed a fault handler,
|
|
* invoke it.
|
|
*/
|
|
if (domain->handler)
|
|
ret = domain->handler(domain, dev, iova, flags,
|
|
domain->handler_token);
|
|
|
|
trace_io_page_fault(dev, iova, flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(report_iommu_fault);
|
|
|
|
static int __init iommu_init(void)
|
|
{
|
|
iommu_group_kset = kset_create_and_add("iommu_groups",
|
|
NULL, kernel_kobj);
|
|
BUG_ON(!iommu_group_kset);
|
|
|
|
iommu_debugfs_setup();
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(iommu_init);
|
|
|
|
int iommu_enable_nesting(struct iommu_domain *domain)
|
|
{
|
|
if (domain->type != IOMMU_DOMAIN_UNMANAGED)
|
|
return -EINVAL;
|
|
if (!domain->ops->enable_nesting)
|
|
return -EINVAL;
|
|
return domain->ops->enable_nesting(domain);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_enable_nesting);
|
|
|
|
int iommu_set_pgtable_quirks(struct iommu_domain *domain,
|
|
unsigned long quirk)
|
|
{
|
|
if (domain->type != IOMMU_DOMAIN_UNMANAGED)
|
|
return -EINVAL;
|
|
if (!domain->ops->set_pgtable_quirks)
|
|
return -EINVAL;
|
|
return domain->ops->set_pgtable_quirks(domain, quirk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_set_pgtable_quirks);
|
|
|
|
void iommu_get_resv_regions(struct device *dev, struct list_head *list)
|
|
{
|
|
const struct iommu_ops *ops = dev_iommu_ops(dev);
|
|
|
|
if (ops->get_resv_regions)
|
|
ops->get_resv_regions(dev, list);
|
|
}
|
|
|
|
/**
|
|
* iommu_put_resv_regions - release resered regions
|
|
* @dev: device for which to free reserved regions
|
|
* @list: reserved region list for device
|
|
*
|
|
* This releases a reserved region list acquired by iommu_get_resv_regions().
|
|
*/
|
|
void 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) {
|
|
if (entry->free)
|
|
entry->free(dev, entry);
|
|
else
|
|
kfree(entry);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(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,
|
|
gfp_t gfp)
|
|
{
|
|
struct iommu_resv_region *region;
|
|
|
|
region = kzalloc(sizeof(*region), gfp);
|
|
if (!region)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(®ion->list);
|
|
region->start = start;
|
|
region->length = length;
|
|
region->prot = prot;
|
|
region->type = type;
|
|
return region;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_alloc_resv_region);
|
|
|
|
void iommu_set_default_passthrough(bool cmd_line)
|
|
{
|
|
if (cmd_line)
|
|
iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API;
|
|
iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
|
|
}
|
|
|
|
void iommu_set_default_translated(bool cmd_line)
|
|
{
|
|
if (cmd_line)
|
|
iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API;
|
|
iommu_def_domain_type = IOMMU_DOMAIN_DMA;
|
|
}
|
|
|
|
bool iommu_default_passthrough(void)
|
|
{
|
|
return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_default_passthrough);
|
|
|
|
const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
|
|
{
|
|
const struct iommu_ops *ops = NULL;
|
|
struct iommu_device *iommu;
|
|
|
|
spin_lock(&iommu_device_lock);
|
|
list_for_each_entry(iommu, &iommu_device_list, list)
|
|
if (iommu->fwnode == fwnode) {
|
|
ops = iommu->ops;
|
|
break;
|
|
}
|
|
spin_unlock(&iommu_device_lock);
|
|
return ops;
|
|
}
|
|
|
|
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
|
|
const struct iommu_ops *ops)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
|
|
if (fwspec)
|
|
return ops == fwspec->ops ? 0 : -EINVAL;
|
|
|
|
if (!dev_iommu_get(dev))
|
|
return -ENOMEM;
|
|
|
|
/* Preallocate for the overwhelmingly common case of 1 ID */
|
|
fwspec = kzalloc(struct_size(fwspec, ids, 1), GFP_KERNEL);
|
|
if (!fwspec)
|
|
return -ENOMEM;
|
|
|
|
of_node_get(to_of_node(iommu_fwnode));
|
|
fwspec->iommu_fwnode = iommu_fwnode;
|
|
fwspec->ops = ops;
|
|
dev_iommu_fwspec_set(dev, fwspec);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_init);
|
|
|
|
void iommu_fwspec_free(struct device *dev)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
|
|
if (fwspec) {
|
|
fwnode_handle_put(fwspec->iommu_fwnode);
|
|
kfree(fwspec);
|
|
dev_iommu_fwspec_set(dev, NULL);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_free);
|
|
|
|
int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
int i, new_num;
|
|
|
|
if (!fwspec)
|
|
return -EINVAL;
|
|
|
|
new_num = fwspec->num_ids + num_ids;
|
|
if (new_num > 1) {
|
|
fwspec = krealloc(fwspec, struct_size(fwspec, ids, new_num),
|
|
GFP_KERNEL);
|
|
if (!fwspec)
|
|
return -ENOMEM;
|
|
|
|
dev_iommu_fwspec_set(dev, fwspec);
|
|
}
|
|
|
|
for (i = 0; i < num_ids; i++)
|
|
fwspec->ids[fwspec->num_ids + i] = ids[i];
|
|
|
|
fwspec->num_ids = new_num;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);
|
|
|
|
/*
|
|
* Per device IOMMU features.
|
|
*/
|
|
int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
|
|
{
|
|
if (dev->iommu && dev->iommu->iommu_dev) {
|
|
const struct iommu_ops *ops = dev->iommu->iommu_dev->ops;
|
|
|
|
if (ops->dev_enable_feat)
|
|
return ops->dev_enable_feat(dev, feat);
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_dev_enable_feature);
|
|
|
|
/*
|
|
* The device drivers should do the necessary cleanups before calling this.
|
|
*/
|
|
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);
|
|
|
|
/**
|
|
* iommu_setup_default_domain - Set the default_domain for the group
|
|
* @group: Group to change
|
|
* @target_type: Domain type to set as the default_domain
|
|
*
|
|
* Allocate a default domain and set it as the current domain on the group. If
|
|
* the group already has a default domain it will be changed to the target_type.
|
|
* When target_type is 0 the default domain is selected based on driver and
|
|
* system preferences.
|
|
*/
|
|
static int iommu_setup_default_domain(struct iommu_group *group,
|
|
int target_type)
|
|
{
|
|
struct iommu_domain *old_dom = group->default_domain;
|
|
struct group_device *gdev;
|
|
struct iommu_domain *dom;
|
|
bool direct_failed;
|
|
int req_type;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&group->mutex);
|
|
|
|
req_type = iommu_get_default_domain_type(group, target_type);
|
|
if (req_type < 0)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* There are still some drivers which don't support default domains, so
|
|
* we ignore the failure and leave group->default_domain NULL.
|
|
*
|
|
* We assume that the iommu driver starts up the device in
|
|
* 'set_platform_dma_ops' mode if it does not support default domains.
|
|
*/
|
|
dom = iommu_group_alloc_default_domain(group, req_type);
|
|
if (!dom) {
|
|
/* Once in default_domain mode we never leave */
|
|
if (group->default_domain)
|
|
return -ENODEV;
|
|
group->default_domain = NULL;
|
|
return 0;
|
|
}
|
|
|
|
if (group->default_domain == dom)
|
|
return 0;
|
|
|
|
/*
|
|
* IOMMU_RESV_DIRECT and IOMMU_RESV_DIRECT_RELAXABLE regions must be
|
|
* mapped before their device is attached, in order to guarantee
|
|
* continuity with any FW activity
|
|
*/
|
|
direct_failed = false;
|
|
for_each_group_device(group, gdev) {
|
|
if (iommu_create_device_direct_mappings(dom, gdev->dev)) {
|
|
direct_failed = true;
|
|
dev_warn_once(
|
|
gdev->dev->iommu->iommu_dev->dev,
|
|
"IOMMU driver was not able to establish FW requested direct mapping.");
|
|
}
|
|
}
|
|
|
|
/* We must set default_domain early for __iommu_device_set_domain */
|
|
group->default_domain = dom;
|
|
if (!group->domain) {
|
|
/*
|
|
* Drivers are not allowed to fail the first domain attach.
|
|
* The only way to recover from this is to fail attaching the
|
|
* iommu driver and call ops->release_device. Put the domain
|
|
* in group->default_domain so it is freed after.
|
|
*/
|
|
ret = __iommu_group_set_domain_internal(
|
|
group, dom, IOMMU_SET_DOMAIN_MUST_SUCCEED);
|
|
if (WARN_ON(ret))
|
|
goto out_free_old;
|
|
} else {
|
|
ret = __iommu_group_set_domain(group, dom);
|
|
if (ret)
|
|
goto err_restore_def_domain;
|
|
}
|
|
|
|
/*
|
|
* Drivers are supposed to allow mappings to be installed in a domain
|
|
* before device attachment, but some don't. Hack around this defect by
|
|
* trying again after attaching. If this happens it means the device
|
|
* will not continuously have the IOMMU_RESV_DIRECT map.
|
|
*/
|
|
if (direct_failed) {
|
|
for_each_group_device(group, gdev) {
|
|
ret = iommu_create_device_direct_mappings(dom, gdev->dev);
|
|
if (ret)
|
|
goto err_restore_domain;
|
|
}
|
|
}
|
|
|
|
out_free_old:
|
|
if (old_dom)
|
|
iommu_domain_free(old_dom);
|
|
return ret;
|
|
|
|
err_restore_domain:
|
|
if (old_dom)
|
|
__iommu_group_set_domain_internal(
|
|
group, old_dom, IOMMU_SET_DOMAIN_MUST_SUCCEED);
|
|
err_restore_def_domain:
|
|
if (old_dom) {
|
|
iommu_domain_free(dom);
|
|
group->default_domain = old_dom;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Changing the default domain through sysfs requires the users to unbind the
|
|
* drivers from the devices in the iommu group, except for a DMA -> DMA-FQ
|
|
* transition. Return failure if this isn't met.
|
|
*
|
|
* We need to consider the race between this and the device release path.
|
|
* group->mutex 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 *gdev;
|
|
int ret, req_type;
|
|
|
|
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
|
|
return -EACCES;
|
|
|
|
if (WARN_ON(!group) || !group->default_domain)
|
|
return -EINVAL;
|
|
|
|
if (sysfs_streq(buf, "identity"))
|
|
req_type = IOMMU_DOMAIN_IDENTITY;
|
|
else if (sysfs_streq(buf, "DMA"))
|
|
req_type = IOMMU_DOMAIN_DMA;
|
|
else if (sysfs_streq(buf, "DMA-FQ"))
|
|
req_type = IOMMU_DOMAIN_DMA_FQ;
|
|
else if (sysfs_streq(buf, "auto"))
|
|
req_type = 0;
|
|
else
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&group->mutex);
|
|
/* We can bring up a flush queue without tearing down the domain. */
|
|
if (req_type == IOMMU_DOMAIN_DMA_FQ &&
|
|
group->default_domain->type == IOMMU_DOMAIN_DMA) {
|
|
ret = iommu_dma_init_fq(group->default_domain);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
group->default_domain->type = IOMMU_DOMAIN_DMA_FQ;
|
|
ret = count;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Otherwise, ensure that device exists and no driver is bound. */
|
|
if (list_empty(&group->devices) || group->owner_cnt) {
|
|
ret = -EPERM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = iommu_setup_default_domain(group, req_type);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* 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 */
|
|
for_each_group_device(group, gdev)
|
|
iommu_group_do_probe_finalize(gdev->dev);
|
|
return count;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&group->mutex);
|
|
return ret ?: count;
|
|
}
|
|
|
|
static bool iommu_is_default_domain(struct iommu_group *group)
|
|
{
|
|
if (group->domain == group->default_domain)
|
|
return true;
|
|
|
|
/*
|
|
* If the default domain was set to identity and it is still an identity
|
|
* domain then we consider this a pass. This happens because of
|
|
* amd_iommu_init_device() replacing the default idenytity domain with an
|
|
* identity domain that has a different configuration for AMDGPU.
|
|
*/
|
|
if (group->default_domain &&
|
|
group->default_domain->type == IOMMU_DOMAIN_IDENTITY &&
|
|
group->domain && group->domain->type == IOMMU_DOMAIN_IDENTITY)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* iommu_device_use_default_domain() - Device driver wants to handle device
|
|
* DMA through the kernel DMA API.
|
|
* @dev: The device.
|
|
*
|
|
* The device driver about to bind @dev wants to do DMA through the kernel
|
|
* DMA API. Return 0 if it is allowed, otherwise an error.
|
|
*/
|
|
int iommu_device_use_default_domain(struct device *dev)
|
|
{
|
|
struct iommu_group *group = iommu_group_get(dev);
|
|
int ret = 0;
|
|
|
|
if (!group)
|
|
return 0;
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (group->owner_cnt) {
|
|
if (group->owner || !iommu_is_default_domain(group) ||
|
|
!xa_empty(&group->pasid_array)) {
|
|
ret = -EBUSY;
|
|
goto unlock_out;
|
|
}
|
|
}
|
|
|
|
group->owner_cnt++;
|
|
|
|
unlock_out:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* iommu_device_unuse_default_domain() - Device driver stops handling device
|
|
* DMA through the kernel DMA API.
|
|
* @dev: The device.
|
|
*
|
|
* The device driver doesn't want to do DMA through kernel DMA API anymore.
|
|
* It must be called after iommu_device_use_default_domain().
|
|
*/
|
|
void iommu_device_unuse_default_domain(struct device *dev)
|
|
{
|
|
struct iommu_group *group = iommu_group_get(dev);
|
|
|
|
if (!group)
|
|
return;
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (!WARN_ON(!group->owner_cnt || !xa_empty(&group->pasid_array)))
|
|
group->owner_cnt--;
|
|
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
}
|
|
|
|
static int __iommu_group_alloc_blocking_domain(struct iommu_group *group)
|
|
{
|
|
struct group_device *dev =
|
|
list_first_entry(&group->devices, struct group_device, list);
|
|
|
|
if (group->blocking_domain)
|
|
return 0;
|
|
|
|
group->blocking_domain =
|
|
__iommu_domain_alloc(dev->dev->bus, IOMMU_DOMAIN_BLOCKED);
|
|
if (!group->blocking_domain) {
|
|
/*
|
|
* For drivers that do not yet understand IOMMU_DOMAIN_BLOCKED
|
|
* create an empty domain instead.
|
|
*/
|
|
group->blocking_domain = __iommu_domain_alloc(
|
|
dev->dev->bus, IOMMU_DOMAIN_UNMANAGED);
|
|
if (!group->blocking_domain)
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __iommu_take_dma_ownership(struct iommu_group *group, void *owner)
|
|
{
|
|
int ret;
|
|
|
|
if ((group->domain && group->domain != group->default_domain) ||
|
|
!xa_empty(&group->pasid_array))
|
|
return -EBUSY;
|
|
|
|
ret = __iommu_group_alloc_blocking_domain(group);
|
|
if (ret)
|
|
return ret;
|
|
ret = __iommu_group_set_domain(group, group->blocking_domain);
|
|
if (ret)
|
|
return ret;
|
|
|
|
group->owner = owner;
|
|
group->owner_cnt++;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iommu_group_claim_dma_owner() - Set DMA ownership of a group
|
|
* @group: The group.
|
|
* @owner: Caller specified pointer. Used for exclusive ownership.
|
|
*
|
|
* This is to support backward compatibility for vfio which manages the dma
|
|
* ownership in iommu_group level. New invocations on this interface should be
|
|
* prohibited. Only a single owner may exist for a group.
|
|
*/
|
|
int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (WARN_ON(!owner))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (group->owner_cnt) {
|
|
ret = -EPERM;
|
|
goto unlock_out;
|
|
}
|
|
|
|
ret = __iommu_take_dma_ownership(group, owner);
|
|
unlock_out:
|
|
mutex_unlock(&group->mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_claim_dma_owner);
|
|
|
|
/**
|
|
* iommu_device_claim_dma_owner() - Set DMA ownership of a device
|
|
* @dev: The device.
|
|
* @owner: Caller specified pointer. Used for exclusive ownership.
|
|
*
|
|
* Claim the DMA ownership of a device. Multiple devices in the same group may
|
|
* concurrently claim ownership if they present the same owner value. Returns 0
|
|
* on success and error code on failure
|
|
*/
|
|
int iommu_device_claim_dma_owner(struct device *dev, void *owner)
|
|
{
|
|
struct iommu_group *group;
|
|
int ret = 0;
|
|
|
|
if (WARN_ON(!owner))
|
|
return -EINVAL;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (group->owner_cnt) {
|
|
if (group->owner != owner) {
|
|
ret = -EPERM;
|
|
goto unlock_out;
|
|
}
|
|
group->owner_cnt++;
|
|
goto unlock_out;
|
|
}
|
|
|
|
ret = __iommu_take_dma_ownership(group, owner);
|
|
unlock_out:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_device_claim_dma_owner);
|
|
|
|
static void __iommu_release_dma_ownership(struct iommu_group *group)
|
|
{
|
|
if (WARN_ON(!group->owner_cnt || !group->owner ||
|
|
!xa_empty(&group->pasid_array)))
|
|
return;
|
|
|
|
group->owner_cnt = 0;
|
|
group->owner = NULL;
|
|
__iommu_group_set_domain_nofail(group, group->default_domain);
|
|
}
|
|
|
|
/**
|
|
* iommu_group_release_dma_owner() - Release DMA ownership of a group
|
|
* @group: The group
|
|
*
|
|
* Release the DMA ownership claimed by iommu_group_claim_dma_owner().
|
|
*/
|
|
void iommu_group_release_dma_owner(struct iommu_group *group)
|
|
{
|
|
mutex_lock(&group->mutex);
|
|
__iommu_release_dma_ownership(group);
|
|
mutex_unlock(&group->mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_release_dma_owner);
|
|
|
|
/**
|
|
* iommu_device_release_dma_owner() - Release DMA ownership of a device
|
|
* @dev: The device.
|
|
*
|
|
* Release the DMA ownership claimed by iommu_device_claim_dma_owner().
|
|
*/
|
|
void iommu_device_release_dma_owner(struct device *dev)
|
|
{
|
|
struct iommu_group *group = iommu_group_get(dev);
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (group->owner_cnt > 1)
|
|
group->owner_cnt--;
|
|
else
|
|
__iommu_release_dma_ownership(group);
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_device_release_dma_owner);
|
|
|
|
/**
|
|
* iommu_group_dma_owner_claimed() - Query group dma ownership status
|
|
* @group: The group.
|
|
*
|
|
* This provides status query on a given group. It is racy and only for
|
|
* non-binding status reporting.
|
|
*/
|
|
bool iommu_group_dma_owner_claimed(struct iommu_group *group)
|
|
{
|
|
unsigned int user;
|
|
|
|
mutex_lock(&group->mutex);
|
|
user = group->owner_cnt;
|
|
mutex_unlock(&group->mutex);
|
|
|
|
return user;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_dma_owner_claimed);
|
|
|
|
static int __iommu_set_group_pasid(struct iommu_domain *domain,
|
|
struct iommu_group *group, ioasid_t pasid)
|
|
{
|
|
struct group_device *device;
|
|
int ret = 0;
|
|
|
|
for_each_group_device(group, device) {
|
|
ret = domain->ops->set_dev_pasid(domain, device->dev, pasid);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __iommu_remove_group_pasid(struct iommu_group *group,
|
|
ioasid_t pasid)
|
|
{
|
|
struct group_device *device;
|
|
const struct iommu_ops *ops;
|
|
|
|
for_each_group_device(group, device) {
|
|
ops = dev_iommu_ops(device->dev);
|
|
ops->remove_dev_pasid(device->dev, pasid);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* iommu_attach_device_pasid() - Attach a domain to pasid of device
|
|
* @domain: the iommu domain.
|
|
* @dev: the attached device.
|
|
* @pasid: the pasid of the device.
|
|
*
|
|
* Return: 0 on success, or an error.
|
|
*/
|
|
int iommu_attach_device_pasid(struct iommu_domain *domain,
|
|
struct device *dev, ioasid_t pasid)
|
|
{
|
|
struct iommu_group *group;
|
|
void *curr;
|
|
int ret;
|
|
|
|
if (!domain->ops->set_dev_pasid)
|
|
return -EOPNOTSUPP;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&group->mutex);
|
|
curr = xa_cmpxchg(&group->pasid_array, pasid, NULL, domain, GFP_KERNEL);
|
|
if (curr) {
|
|
ret = xa_err(curr) ? : -EBUSY;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = __iommu_set_group_pasid(domain, group, pasid);
|
|
if (ret) {
|
|
__iommu_remove_group_pasid(group, pasid);
|
|
xa_erase(&group->pasid_array, pasid);
|
|
}
|
|
out_unlock:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_attach_device_pasid);
|
|
|
|
/*
|
|
* iommu_detach_device_pasid() - Detach the domain from pasid of device
|
|
* @domain: the iommu domain.
|
|
* @dev: the attached device.
|
|
* @pasid: the pasid of the device.
|
|
*
|
|
* The @domain must have been attached to @pasid of the @dev with
|
|
* iommu_attach_device_pasid().
|
|
*/
|
|
void iommu_detach_device_pasid(struct iommu_domain *domain, struct device *dev,
|
|
ioasid_t pasid)
|
|
{
|
|
struct iommu_group *group = iommu_group_get(dev);
|
|
|
|
mutex_lock(&group->mutex);
|
|
__iommu_remove_group_pasid(group, pasid);
|
|
WARN_ON(xa_erase(&group->pasid_array, pasid) != domain);
|
|
mutex_unlock(&group->mutex);
|
|
|
|
iommu_group_put(group);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_detach_device_pasid);
|
|
|
|
/*
|
|
* iommu_get_domain_for_dev_pasid() - Retrieve domain for @pasid of @dev
|
|
* @dev: the queried device
|
|
* @pasid: the pasid of the device
|
|
* @type: matched domain type, 0 for any match
|
|
*
|
|
* This is a variant of iommu_get_domain_for_dev(). It returns the existing
|
|
* domain attached to pasid of a device. Callers must hold a lock around this
|
|
* function, and both iommu_attach/detach_dev_pasid() whenever a domain of
|
|
* type is being manipulated. This API does not internally resolve races with
|
|
* attach/detach.
|
|
*
|
|
* Return: attached domain on success, NULL otherwise.
|
|
*/
|
|
struct iommu_domain *iommu_get_domain_for_dev_pasid(struct device *dev,
|
|
ioasid_t pasid,
|
|
unsigned int type)
|
|
{
|
|
struct iommu_domain *domain;
|
|
struct iommu_group *group;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return NULL;
|
|
|
|
xa_lock(&group->pasid_array);
|
|
domain = xa_load(&group->pasid_array, pasid);
|
|
if (type && domain && domain->type != type)
|
|
domain = ERR_PTR(-EBUSY);
|
|
xa_unlock(&group->pasid_array);
|
|
iommu_group_put(group);
|
|
|
|
return domain;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev_pasid);
|
|
|
|
struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
|
|
struct mm_struct *mm)
|
|
{
|
|
const struct iommu_ops *ops = dev_iommu_ops(dev);
|
|
struct iommu_domain *domain;
|
|
|
|
domain = ops->domain_alloc(IOMMU_DOMAIN_SVA);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
domain->type = IOMMU_DOMAIN_SVA;
|
|
mmgrab(mm);
|
|
domain->mm = mm;
|
|
domain->iopf_handler = iommu_sva_handle_iopf;
|
|
domain->fault_data = mm;
|
|
|
|
return domain;
|
|
}
|
|
|
|
ioasid_t iommu_alloc_global_pasid(struct device *dev)
|
|
{
|
|
int ret;
|
|
|
|
/* max_pasids == 0 means that the device does not support PASID */
|
|
if (!dev->iommu->max_pasids)
|
|
return IOMMU_PASID_INVALID;
|
|
|
|
/*
|
|
* max_pasids is set up by vendor driver based on number of PASID bits
|
|
* supported but the IDA allocation is inclusive.
|
|
*/
|
|
ret = ida_alloc_range(&iommu_global_pasid_ida, IOMMU_FIRST_GLOBAL_PASID,
|
|
dev->iommu->max_pasids - 1, GFP_KERNEL);
|
|
return ret < 0 ? IOMMU_PASID_INVALID : ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_alloc_global_pasid);
|
|
|
|
void iommu_free_global_pasid(ioasid_t pasid)
|
|
{
|
|
if (WARN_ON(pasid == IOMMU_PASID_INVALID))
|
|
return;
|
|
|
|
ida_free(&iommu_global_pasid_ida, pasid);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_free_global_pasid);
|