diff options
Diffstat (limited to 'drivers/iommu/amd/iommu_v2.c')
| -rw-r--r-- | drivers/iommu/amd/iommu_v2.c | 996 |
1 files changed, 0 insertions, 996 deletions
diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c deleted file mode 100644 index 57c2fb1146..0000000000 --- a/drivers/iommu/amd/iommu_v2.c +++ /dev/null @@ -1,996 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2010-2012 Advanced Micro Devices, Inc. - * Author: Joerg Roedel <jroedel@suse.de> - */ - -#define pr_fmt(fmt) "AMD-Vi: " fmt - -#include <linux/refcount.h> -#include <linux/mmu_notifier.h> -#include <linux/amd-iommu.h> -#include <linux/mm_types.h> -#include <linux/profile.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/sched/mm.h> -#include <linux/wait.h> -#include <linux/pci.h> -#include <linux/gfp.h> -#include <linux/cc_platform.h> - -#include "amd_iommu.h" - -MODULE_LICENSE("GPL v2"); -MODULE_AUTHOR("Joerg Roedel <jroedel@suse.de>"); - -#define PRI_QUEUE_SIZE 512 - -struct pri_queue { - atomic_t inflight; - bool finish; - int status; -}; - -struct pasid_state { - struct list_head list; /* For global state-list */ - refcount_t count; /* Reference count */ - unsigned mmu_notifier_count; /* Counting nested mmu_notifier - calls */ - struct mm_struct *mm; /* mm_struct for the faults */ - struct mmu_notifier mn; /* mmu_notifier handle */ - struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */ - struct device_state *device_state; /* Link to our device_state */ - u32 pasid; /* PASID index */ - bool invalid; /* Used during setup and - teardown of the pasid */ - spinlock_t lock; /* Protect pri_queues and - mmu_notifer_count */ - wait_queue_head_t wq; /* To wait for count == 0 */ -}; - -struct device_state { - struct list_head list; - u32 sbdf; - atomic_t count; - struct pci_dev *pdev; - struct pasid_state **states; - struct iommu_domain *domain; - int pasid_levels; - int max_pasids; - amd_iommu_invalid_ppr_cb inv_ppr_cb; - amd_iommu_invalidate_ctx inv_ctx_cb; - spinlock_t lock; - wait_queue_head_t wq; -}; - -struct fault { - struct work_struct work; - struct device_state *dev_state; - struct pasid_state *state; - struct mm_struct *mm; - u64 address; - u32 pasid; - u16 tag; - u16 finish; - u16 flags; -}; - -static LIST_HEAD(state_list); -static DEFINE_SPINLOCK(state_lock); - -static struct workqueue_struct *iommu_wq; - -static void free_pasid_states(struct device_state *dev_state); - -static struct device_state *__get_device_state(u32 sbdf) -{ - struct device_state *dev_state; - - list_for_each_entry(dev_state, &state_list, list) { - if (dev_state->sbdf == sbdf) - return dev_state; - } - - return NULL; -} - -static struct device_state *get_device_state(u32 sbdf) -{ - struct device_state *dev_state; - unsigned long flags; - - spin_lock_irqsave(&state_lock, flags); - dev_state = __get_device_state(sbdf); - if (dev_state != NULL) - atomic_inc(&dev_state->count); - spin_unlock_irqrestore(&state_lock, flags); - - return dev_state; -} - -static void free_device_state(struct device_state *dev_state) -{ - struct iommu_group *group; - - /* Get rid of any remaining pasid states */ - free_pasid_states(dev_state); - - /* - * Wait until the last reference is dropped before freeing - * the device state. - */ - wait_event(dev_state->wq, !atomic_read(&dev_state->count)); - - /* - * First detach device from domain - No more PRI requests will arrive - * from that device after it is unbound from the IOMMUv2 domain. - */ - group = iommu_group_get(&dev_state->pdev->dev); - if (WARN_ON(!group)) - return; - - iommu_detach_group(dev_state->domain, group); - - iommu_group_put(group); - - /* Everything is down now, free the IOMMUv2 domain */ - iommu_domain_free(dev_state->domain); - - /* Finally get rid of the device-state */ - kfree(dev_state); -} - -static void put_device_state(struct device_state *dev_state) -{ - if (atomic_dec_and_test(&dev_state->count)) - wake_up(&dev_state->wq); -} - -/* Must be called under dev_state->lock */ -static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state, - u32 pasid, bool alloc) -{ - struct pasid_state **root, **ptr; - int level, index; - - level = dev_state->pasid_levels; - root = dev_state->states; - - while (true) { - - index = (pasid >> (9 * level)) & 0x1ff; - ptr = &root[index]; - - if (level == 0) - break; - - if (*ptr == NULL) { - if (!alloc) - return NULL; - - *ptr = (void *)get_zeroed_page(GFP_ATOMIC); - if (*ptr == NULL) - return NULL; - } - - root = (struct pasid_state **)*ptr; - level -= 1; - } - - return ptr; -} - -static int set_pasid_state(struct device_state *dev_state, - struct pasid_state *pasid_state, - u32 pasid) -{ - struct pasid_state **ptr; - unsigned long flags; - int ret; - - spin_lock_irqsave(&dev_state->lock, flags); - ptr = __get_pasid_state_ptr(dev_state, pasid, true); - - ret = -ENOMEM; - if (ptr == NULL) - goto out_unlock; - - ret = -ENOMEM; - if (*ptr != NULL) - goto out_unlock; - - *ptr = pasid_state; - - ret = 0; - -out_unlock: - spin_unlock_irqrestore(&dev_state->lock, flags); - - return ret; -} - -static void clear_pasid_state(struct device_state *dev_state, u32 pasid) -{ - struct pasid_state **ptr; - unsigned long flags; - - spin_lock_irqsave(&dev_state->lock, flags); - ptr = __get_pasid_state_ptr(dev_state, pasid, true); - - if (ptr == NULL) - goto out_unlock; - - *ptr = NULL; - -out_unlock: - spin_unlock_irqrestore(&dev_state->lock, flags); -} - -static struct pasid_state *get_pasid_state(struct device_state *dev_state, - u32 pasid) -{ - struct pasid_state **ptr, *ret = NULL; - unsigned long flags; - - spin_lock_irqsave(&dev_state->lock, flags); - ptr = __get_pasid_state_ptr(dev_state, pasid, false); - - if (ptr == NULL) - goto out_unlock; - - ret = *ptr; - if (ret) - refcount_inc(&ret->count); - -out_unlock: - spin_unlock_irqrestore(&dev_state->lock, flags); - - return ret; -} - -static void free_pasid_state(struct pasid_state *pasid_state) -{ - kfree(pasid_state); -} - -static void put_pasid_state(struct pasid_state *pasid_state) -{ - if (refcount_dec_and_test(&pasid_state->count)) - wake_up(&pasid_state->wq); -} - -static void put_pasid_state_wait(struct pasid_state *pasid_state) -{ - if (!refcount_dec_and_test(&pasid_state->count)) - wait_event(pasid_state->wq, !refcount_read(&pasid_state->count)); - free_pasid_state(pasid_state); -} - -static void unbind_pasid(struct pasid_state *pasid_state) -{ - struct iommu_domain *domain; - - domain = pasid_state->device_state->domain; - - /* - * Mark pasid_state as invalid, no more faults will we added to the - * work queue after this is visible everywhere. - */ - pasid_state->invalid = true; - - /* Make sure this is visible */ - smp_wmb(); - - /* After this the device/pasid can't access the mm anymore */ - amd_iommu_domain_clear_gcr3(domain, pasid_state->pasid); - - /* Make sure no more pending faults are in the queue */ - flush_workqueue(iommu_wq); -} - -static void free_pasid_states_level1(struct pasid_state **tbl) -{ - int i; - - for (i = 0; i < 512; ++i) { - if (tbl[i] == NULL) - continue; - - free_page((unsigned long)tbl[i]); - } -} - -static void free_pasid_states_level2(struct pasid_state **tbl) -{ - struct pasid_state **ptr; - int i; - - for (i = 0; i < 512; ++i) { - if (tbl[i] == NULL) - continue; - - ptr = (struct pasid_state **)tbl[i]; - free_pasid_states_level1(ptr); - } -} - -static void free_pasid_states(struct device_state *dev_state) -{ - struct pasid_state *pasid_state; - int i; - - for (i = 0; i < dev_state->max_pasids; ++i) { - pasid_state = get_pasid_state(dev_state, i); - if (pasid_state == NULL) - continue; - - put_pasid_state(pasid_state); - - /* Clear the pasid state so that the pasid can be re-used */ - clear_pasid_state(dev_state, pasid_state->pasid); - - /* - * This will call the mn_release function and - * unbind the PASID - */ - mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm); - - put_pasid_state_wait(pasid_state); /* Reference taken in - amd_iommu_bind_pasid */ - - /* Drop reference taken in amd_iommu_bind_pasid */ - put_device_state(dev_state); - } - - if (dev_state->pasid_levels == 2) - free_pasid_states_level2(dev_state->states); - else if (dev_state->pasid_levels == 1) - free_pasid_states_level1(dev_state->states); - else - BUG_ON(dev_state->pasid_levels != 0); - - free_page((unsigned long)dev_state->states); -} - -static struct pasid_state *mn_to_state(struct mmu_notifier *mn) -{ - return container_of(mn, struct pasid_state, mn); -} - -static void mn_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn, - struct mm_struct *mm, - unsigned long start, unsigned long end) -{ - struct pasid_state *pasid_state; - struct device_state *dev_state; - - pasid_state = mn_to_state(mn); - dev_state = pasid_state->device_state; - - if ((start ^ (end - 1)) < PAGE_SIZE) - amd_iommu_flush_page(dev_state->domain, pasid_state->pasid, - start); - else - amd_iommu_flush_tlb(dev_state->domain, pasid_state->pasid); -} - -static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm) -{ - struct pasid_state *pasid_state; - struct device_state *dev_state; - bool run_inv_ctx_cb; - - might_sleep(); - - pasid_state = mn_to_state(mn); - dev_state = pasid_state->device_state; - run_inv_ctx_cb = !pasid_state->invalid; - - if (run_inv_ctx_cb && dev_state->inv_ctx_cb) - dev_state->inv_ctx_cb(dev_state->pdev, pasid_state->pasid); - - unbind_pasid(pasid_state); -} - -static const struct mmu_notifier_ops iommu_mn = { - .release = mn_release, - .arch_invalidate_secondary_tlbs = mn_arch_invalidate_secondary_tlbs, -}; - -static void set_pri_tag_status(struct pasid_state *pasid_state, - u16 tag, int status) -{ - unsigned long flags; - - spin_lock_irqsave(&pasid_state->lock, flags); - pasid_state->pri[tag].status = status; - spin_unlock_irqrestore(&pasid_state->lock, flags); -} - -static void finish_pri_tag(struct device_state *dev_state, - struct pasid_state *pasid_state, - u16 tag) -{ - unsigned long flags; - - spin_lock_irqsave(&pasid_state->lock, flags); - if (atomic_dec_and_test(&pasid_state->pri[tag].inflight) && - pasid_state->pri[tag].finish) { - amd_iommu_complete_ppr(dev_state->pdev, pasid_state->pasid, - pasid_state->pri[tag].status, tag); - pasid_state->pri[tag].finish = false; - pasid_state->pri[tag].status = PPR_SUCCESS; - } - spin_unlock_irqrestore(&pasid_state->lock, flags); -} - -static void handle_fault_error(struct fault *fault) -{ - int status; - - if (!fault->dev_state->inv_ppr_cb) { - set_pri_tag_status(fault->state, fault->tag, PPR_INVALID); - return; - } - - status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev, - fault->pasid, - fault->address, - fault->flags); - switch (status) { - case AMD_IOMMU_INV_PRI_RSP_SUCCESS: - set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS); - break; - case AMD_IOMMU_INV_PRI_RSP_INVALID: - set_pri_tag_status(fault->state, fault->tag, PPR_INVALID); - break; - case AMD_IOMMU_INV_PRI_RSP_FAIL: - set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE); - break; - default: - BUG(); - } -} - -static bool access_error(struct vm_area_struct *vma, struct fault *fault) -{ - unsigned long requested = 0; - - if (fault->flags & PPR_FAULT_EXEC) - requested |= VM_EXEC; - - if (fault->flags & PPR_FAULT_READ) - requested |= VM_READ; - - if (fault->flags & PPR_FAULT_WRITE) - requested |= VM_WRITE; - - return (requested & ~vma->vm_flags) != 0; -} - -static void do_fault(struct work_struct *work) -{ - struct fault *fault = container_of(work, struct fault, work); - struct vm_area_struct *vma; - vm_fault_t ret = VM_FAULT_ERROR; - unsigned int flags = 0; - struct mm_struct *mm; - u64 address; - - mm = fault->state->mm; - address = fault->address; - - if (fault->flags & PPR_FAULT_USER) - flags |= FAULT_FLAG_USER; - if (fault->flags & PPR_FAULT_WRITE) - flags |= FAULT_FLAG_WRITE; - flags |= FAULT_FLAG_REMOTE; - - mmap_read_lock(mm); - vma = vma_lookup(mm, address); - if (!vma) - /* failed to get a vma in the right range */ - goto out; - - /* Check if we have the right permissions on the vma */ - if (access_error(vma, fault)) - goto out; - - ret = handle_mm_fault(vma, address, flags, NULL); -out: - mmap_read_unlock(mm); - - if (ret & VM_FAULT_ERROR) - /* failed to service fault */ - handle_fault_error(fault); - - finish_pri_tag(fault->dev_state, fault->state, fault->tag); - - put_pasid_state(fault->state); - - kfree(fault); -} - -static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data) -{ - struct amd_iommu_fault *iommu_fault; - struct pasid_state *pasid_state; - struct device_state *dev_state; - struct pci_dev *pdev = NULL; - unsigned long flags; - struct fault *fault; - bool finish; - u16 tag, devid, seg_id; - int ret; - - iommu_fault = data; - tag = iommu_fault->tag & 0x1ff; - finish = (iommu_fault->tag >> 9) & 1; - - seg_id = PCI_SBDF_TO_SEGID(iommu_fault->sbdf); - devid = PCI_SBDF_TO_DEVID(iommu_fault->sbdf); - pdev = pci_get_domain_bus_and_slot(seg_id, PCI_BUS_NUM(devid), - devid & 0xff); - if (!pdev) - return -ENODEV; - - ret = NOTIFY_DONE; - - /* In kdump kernel pci dev is not initialized yet -> send INVALID */ - if (amd_iommu_is_attach_deferred(&pdev->dev)) { - amd_iommu_complete_ppr(pdev, iommu_fault->pasid, - PPR_INVALID, tag); - goto out; - } - - dev_state = get_device_state(iommu_fault->sbdf); - if (dev_state == NULL) - goto out; - - pasid_state = get_pasid_state(dev_state, iommu_fault->pasid); - if (pasid_state == NULL || pasid_state->invalid) { - /* We know the device but not the PASID -> send INVALID */ - amd_iommu_complete_ppr(dev_state->pdev, iommu_fault->pasid, - PPR_INVALID, tag); - goto out_drop_state; - } - - spin_lock_irqsave(&pasid_state->lock, flags); - atomic_inc(&pasid_state->pri[tag].inflight); - if (finish) - pasid_state->pri[tag].finish = true; - spin_unlock_irqrestore(&pasid_state->lock, flags); - - fault = kzalloc(sizeof(*fault), GFP_ATOMIC); - if (fault == NULL) { - /* We are OOM - send success and let the device re-fault */ - finish_pri_tag(dev_state, pasid_state, tag); - goto out_drop_state; - } - - fault->dev_state = dev_state; - fault->address = iommu_fault->address; - fault->state = pasid_state; - fault->tag = tag; - fault->finish = finish; - fault->pasid = iommu_fault->pasid; - fault->flags = iommu_fault->flags; - INIT_WORK(&fault->work, do_fault); - - queue_work(iommu_wq, &fault->work); - - ret = NOTIFY_OK; - -out_drop_state: - - if (ret != NOTIFY_OK && pasid_state) - put_pasid_state(pasid_state); - - put_device_state(dev_state); - -out: - pci_dev_put(pdev); - return ret; -} - -static struct notifier_block ppr_nb = { - .notifier_call = ppr_notifier, -}; - -int amd_iommu_bind_pasid(struct pci_dev *pdev, u32 pasid, - struct task_struct *task) -{ - struct pasid_state *pasid_state; - struct device_state *dev_state; - struct mm_struct *mm; - u32 sbdf; - int ret; - - might_sleep(); - - if (!amd_iommu_v2_supported()) - return -ENODEV; - - sbdf = get_pci_sbdf_id(pdev); - dev_state = get_device_state(sbdf); - - if (dev_state == NULL) - return -EINVAL; - - ret = -EINVAL; - if (pasid >= dev_state->max_pasids) - goto out; - - ret = -ENOMEM; - pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL); - if (pasid_state == NULL) - goto out; - - - refcount_set(&pasid_state->count, 1); - init_waitqueue_head(&pasid_state->wq); - spin_lock_init(&pasid_state->lock); - - mm = get_task_mm(task); - pasid_state->mm = mm; - pasid_state->device_state = dev_state; - pasid_state->pasid = pasid; - pasid_state->invalid = true; /* Mark as valid only if we are - done with setting up the pasid */ - pasid_state->mn.ops = &iommu_mn; - - if (pasid_state->mm == NULL) - goto out_free; - - ret = mmu_notifier_register(&pasid_state->mn, mm); - if (ret) - goto out_free; - - ret = set_pasid_state(dev_state, pasid_state, pasid); - if (ret) - goto out_unregister; - - ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid, - __pa(pasid_state->mm->pgd)); - if (ret) - goto out_clear_state; - - /* Now we are ready to handle faults */ - pasid_state->invalid = false; - - /* - * Drop the reference to the mm_struct here. We rely on the - * mmu_notifier release call-back to inform us when the mm - * is going away. - */ - mmput(mm); - - return 0; - -out_clear_state: - clear_pasid_state(dev_state, pasid); - -out_unregister: - mmu_notifier_unregister(&pasid_state->mn, mm); - mmput(mm); - -out_free: - free_pasid_state(pasid_state); - -out: - put_device_state(dev_state); - - return ret; -} -EXPORT_SYMBOL(amd_iommu_bind_pasid); - -void amd_iommu_unbind_pasid(struct pci_dev *pdev, u32 pasid) -{ - struct pasid_state *pasid_state; - struct device_state *dev_state; - u32 sbdf; - - might_sleep(); - - if (!amd_iommu_v2_supported()) - return; - - sbdf = get_pci_sbdf_id(pdev); - dev_state = get_device_state(sbdf); - if (dev_state == NULL) - return; - - if (pasid >= dev_state->max_pasids) - goto out; - - pasid_state = get_pasid_state(dev_state, pasid); - if (pasid_state == NULL) - goto out; - /* - * Drop reference taken here. We are safe because we still hold - * the reference taken in the amd_iommu_bind_pasid function. - */ - put_pasid_state(pasid_state); - - /* Clear the pasid state so that the pasid can be re-used */ - clear_pasid_state(dev_state, pasid_state->pasid); - - /* - * Call mmu_notifier_unregister to drop our reference - * to pasid_state->mm - */ - mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm); - - put_pasid_state_wait(pasid_state); /* Reference taken in - amd_iommu_bind_pasid */ -out: - /* Drop reference taken in this function */ - put_device_state(dev_state); - - /* Drop reference taken in amd_iommu_bind_pasid */ - put_device_state(dev_state); -} -EXPORT_SYMBOL(amd_iommu_unbind_pasid); - -int amd_iommu_init_device(struct pci_dev *pdev, int pasids) -{ - struct device_state *dev_state; - struct iommu_group *group; - unsigned long flags; - int ret, tmp; - u32 sbdf; - - might_sleep(); - - /* - * When memory encryption is active the device is likely not in a - * direct-mapped domain. Forbid using IOMMUv2 functionality for now. - */ - if (cc_platform_has(CC_ATTR_MEM_ENCRYPT)) - return -ENODEV; - - if (!amd_iommu_v2_supported()) - return -ENODEV; - - if (pasids <= 0 || pasids > (PASID_MASK + 1)) - return -EINVAL; - - sbdf = get_pci_sbdf_id(pdev); - - dev_state = kzalloc(sizeof(*dev_state), GFP_KERNEL); - if (dev_state == NULL) - return -ENOMEM; - - spin_lock_init(&dev_state->lock); - init_waitqueue_head(&dev_state->wq); - dev_state->pdev = pdev; - dev_state->sbdf = sbdf; - - tmp = pasids; - for (dev_state->pasid_levels = 0; (tmp - 1) & ~0x1ff; tmp >>= 9) - dev_state->pasid_levels += 1; - - atomic_set(&dev_state->count, 1); - dev_state->max_pasids = pasids; - - ret = -ENOMEM; - dev_state->states = (void *)get_zeroed_page(GFP_KERNEL); - if (dev_state->states == NULL) - goto out_free_dev_state; - - dev_state->domain = iommu_domain_alloc(&pci_bus_type); - if (dev_state->domain == NULL) - goto out_free_states; - - /* See iommu_is_default_domain() */ - dev_state->domain->type = IOMMU_DOMAIN_IDENTITY; - amd_iommu_domain_direct_map(dev_state->domain); - - ret = amd_iommu_domain_enable_v2(dev_state->domain, pasids); - if (ret) - goto out_free_domain; - - group = iommu_group_get(&pdev->dev); - if (!group) { - ret = -EINVAL; - goto out_free_domain; - } - - ret = iommu_attach_group(dev_state->domain, group); - if (ret != 0) - goto out_drop_group; - - iommu_group_put(group); - - spin_lock_irqsave(&state_lock, flags); - - if (__get_device_state(sbdf) != NULL) { - spin_unlock_irqrestore(&state_lock, flags); - ret = -EBUSY; - goto out_free_domain; - } - - list_add_tail(&dev_state->list, &state_list); - - spin_unlock_irqrestore(&state_lock, flags); - - return 0; - -out_drop_group: - iommu_group_put(group); - -out_free_domain: - iommu_domain_free(dev_state->domain); - -out_free_states: - free_page((unsigned long)dev_state->states); - -out_free_dev_state: - kfree(dev_state); - - return ret; -} -EXPORT_SYMBOL(amd_iommu_init_device); - -void amd_iommu_free_device(struct pci_dev *pdev) -{ - struct device_state *dev_state; - unsigned long flags; - u32 sbdf; - - if (!amd_iommu_v2_supported()) - return; - - sbdf = get_pci_sbdf_id(pdev); - - spin_lock_irqsave(&state_lock, flags); - - dev_state = __get_device_state(sbdf); - if (dev_state == NULL) { - spin_unlock_irqrestore(&state_lock, flags); - return; - } - - list_del(&dev_state->list); - - spin_unlock_irqrestore(&state_lock, flags); - - put_device_state(dev_state); - free_device_state(dev_state); -} -EXPORT_SYMBOL(amd_iommu_free_device); - -int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev, - amd_iommu_invalid_ppr_cb cb) -{ - struct device_state *dev_state; - unsigned long flags; - u32 sbdf; - int ret; - - if (!amd_iommu_v2_supported()) - return -ENODEV; - - sbdf = get_pci_sbdf_id(pdev); - - spin_lock_irqsave(&state_lock, flags); - - ret = -EINVAL; - dev_state = __get_device_state(sbdf); - if (dev_state == NULL) - goto out_unlock; - - dev_state->inv_ppr_cb = cb; - - ret = 0; - -out_unlock: - spin_unlock_irqrestore(&state_lock, flags); - - return ret; -} -EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb); - -int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev, - amd_iommu_invalidate_ctx cb) -{ - struct device_state *dev_state; - unsigned long flags; - u32 sbdf; - int ret; - - if (!amd_iommu_v2_supported()) - return -ENODEV; - - sbdf = get_pci_sbdf_id(pdev); - - spin_lock_irqsave(&state_lock, flags); - - ret = -EINVAL; - dev_state = __get_device_state(sbdf); - if (dev_state == NULL) - goto out_unlock; - - dev_state->inv_ctx_cb = cb; - - ret = 0; - -out_unlock: - spin_unlock_irqrestore(&state_lock, flags); - - return ret; -} -EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb); - -static int __init amd_iommu_v2_init(void) -{ - int ret; - - if (!amd_iommu_v2_supported()) { - pr_info("AMD IOMMUv2 functionality not available on this system - This is not a bug.\n"); - /* - * Load anyway to provide the symbols to other modules - * which may use AMD IOMMUv2 optionally. - */ - return 0; - } - - ret = -ENOMEM; - iommu_wq = alloc_workqueue("amd_iommu_v2", WQ_MEM_RECLAIM, 0); - if (iommu_wq == NULL) - goto out; - - amd_iommu_register_ppr_notifier(&ppr_nb); - - pr_info("AMD IOMMUv2 loaded and initialized\n"); - - return 0; - -out: - return ret; -} - -static void __exit amd_iommu_v2_exit(void) -{ - struct device_state *dev_state, *next; - unsigned long flags; - LIST_HEAD(freelist); - - if (!amd_iommu_v2_supported()) - return; - - amd_iommu_unregister_ppr_notifier(&ppr_nb); - - flush_workqueue(iommu_wq); - - /* - * The loop below might call flush_workqueue(), so call - * destroy_workqueue() after it - */ - spin_lock_irqsave(&state_lock, flags); - - list_for_each_entry_safe(dev_state, next, &state_list, list) { - WARN_ON_ONCE(1); - - put_device_state(dev_state); - list_del(&dev_state->list); - list_add_tail(&dev_state->list, &freelist); - } - - spin_unlock_irqrestore(&state_lock, flags); - - /* - * Since free_device_state waits on the count to be zero, - * we need to free dev_state outside the spinlock. - */ - list_for_each_entry_safe(dev_state, next, &freelist, list) { - list_del(&dev_state->list); - free_device_state(dev_state); - } - - destroy_workqueue(iommu_wq); -} - -module_init(amd_iommu_v2_init); -module_exit(amd_iommu_v2_exit); |