iommu/amd: Move AMD IOMMU driver into subdirectory
Move all files related to the AMD IOMMU driver into its own subdirectory. Signed-off-by: Joerg Roedel <jroedel@suse.de> Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Link: https://lore.kernel.org/r/20200609130303.26974-2-joro@8bytes.org
This commit is contained in:
Joerg Roedel
981
drivers/iommu/amd/iommu_v2.c
Normal file
981
drivers/iommu/amd/iommu_v2.c
Normal file
@@ -0,0 +1,981 @@
|
||||
// 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/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 "amd_iommu.h"
|
||||
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_AUTHOR("Joerg Roedel <jroedel@suse.de>");
|
||||
|
||||
#define MAX_DEVICES 0x10000
|
||||
#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 */
|
||||
atomic_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 */
|
||||
int 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;
|
||||
u16 devid;
|
||||
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;
|
||||
u16 devid;
|
||||
u16 pasid;
|
||||
u16 tag;
|
||||
u16 finish;
|
||||
u16 flags;
|
||||
};
|
||||
|
||||
static LIST_HEAD(state_list);
|
||||
static spinlock_t state_lock;
|
||||
|
||||
static struct workqueue_struct *iommu_wq;
|
||||
|
||||
static void free_pasid_states(struct device_state *dev_state);
|
||||
|
||||
static u16 device_id(struct pci_dev *pdev)
|
||||
{
|
||||
u16 devid;
|
||||
|
||||
devid = pdev->bus->number;
|
||||
devid = (devid << 8) | pdev->devfn;
|
||||
|
||||
return devid;
|
||||
}
|
||||
|
||||
static struct device_state *__get_device_state(u16 devid)
|
||||
{
|
||||
struct device_state *dev_state;
|
||||
|
||||
list_for_each_entry(dev_state, &state_list, list) {
|
||||
if (dev_state->devid == devid)
|
||||
return dev_state;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static struct device_state *get_device_state(u16 devid)
|
||||
{
|
||||
struct device_state *dev_state;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&state_lock, flags);
|
||||
dev_state = __get_device_state(devid);
|
||||
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;
|
||||
|
||||
/*
|
||||
* 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,
|
||||
int 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,
|
||||
int 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, int 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,
|
||||
int 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)
|
||||
atomic_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 (atomic_dec_and_test(&pasid_state->count))
|
||||
wake_up(&pasid_state->wq);
|
||||
}
|
||||
|
||||
static void put_pasid_state_wait(struct pasid_state *pasid_state)
|
||||
{
|
||||
atomic_dec(&pasid_state->count);
|
||||
wait_event(pasid_state->wq, !atomic_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);
|
||||
|
||||
/*
|
||||
* 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_invalidate_range(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,
|
||||
.invalidate_range = mn_invalidate_range,
|
||||
};
|
||||
|
||||
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;
|
||||
|
||||
down_read(&mm->mmap_sem);
|
||||
vma = find_extend_vma(mm, address);
|
||||
if (!vma || address < vma->vm_start)
|
||||
/* 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);
|
||||
out:
|
||||
up_read(&mm->mmap_sem);
|
||||
|
||||
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;
|
||||
int ret;
|
||||
|
||||
iommu_fault = data;
|
||||
tag = iommu_fault->tag & 0x1ff;
|
||||
finish = (iommu_fault->tag >> 9) & 1;
|
||||
|
||||
devid = iommu_fault->device_id;
|
||||
pdev = pci_get_domain_bus_and_slot(0, 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(NULL, &pdev->dev)) {
|
||||
amd_iommu_complete_ppr(pdev, iommu_fault->pasid,
|
||||
PPR_INVALID, tag);
|
||||
goto out;
|
||||
}
|
||||
|
||||
dev_state = get_device_state(iommu_fault->device_id);
|
||||
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:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct notifier_block ppr_nb = {
|
||||
.notifier_call = ppr_notifier,
|
||||
};
|
||||
|
||||
int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
|
||||
struct task_struct *task)
|
||||
{
|
||||
struct pasid_state *pasid_state;
|
||||
struct device_state *dev_state;
|
||||
struct mm_struct *mm;
|
||||
u16 devid;
|
||||
int ret;
|
||||
|
||||
might_sleep();
|
||||
|
||||
if (!amd_iommu_v2_supported())
|
||||
return -ENODEV;
|
||||
|
||||
devid = device_id(pdev);
|
||||
dev_state = get_device_state(devid);
|
||||
|
||||
if (dev_state == NULL)
|
||||
return -EINVAL;
|
||||
|
||||
ret = -EINVAL;
|
||||
if (pasid < 0 || pasid >= dev_state->max_pasids)
|
||||
goto out;
|
||||
|
||||
ret = -ENOMEM;
|
||||
pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL);
|
||||
if (pasid_state == NULL)
|
||||
goto out;
|
||||
|
||||
|
||||
atomic_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;
|
||||
|
||||
mmu_notifier_register(&pasid_state->mn, mm);
|
||||
|
||||
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, int pasid)
|
||||
{
|
||||
struct pasid_state *pasid_state;
|
||||
struct device_state *dev_state;
|
||||
u16 devid;
|
||||
|
||||
might_sleep();
|
||||
|
||||
if (!amd_iommu_v2_supported())
|
||||
return;
|
||||
|
||||
devid = device_id(pdev);
|
||||
dev_state = get_device_state(devid);
|
||||
if (dev_state == NULL)
|
||||
return;
|
||||
|
||||
if (pasid < 0 || 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;
|
||||
u16 devid;
|
||||
|
||||
might_sleep();
|
||||
|
||||
if (!amd_iommu_v2_supported())
|
||||
return -ENODEV;
|
||||
|
||||
if (pasids <= 0 || pasids > (PASID_MASK + 1))
|
||||
return -EINVAL;
|
||||
|
||||
devid = device_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->devid = devid;
|
||||
|
||||
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;
|
||||
|
||||
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(devid) != 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;
|
||||
u16 devid;
|
||||
|
||||
if (!amd_iommu_v2_supported())
|
||||
return;
|
||||
|
||||
devid = device_id(pdev);
|
||||
|
||||
spin_lock_irqsave(&state_lock, flags);
|
||||
|
||||
dev_state = __get_device_state(devid);
|
||||
if (dev_state == NULL) {
|
||||
spin_unlock_irqrestore(&state_lock, flags);
|
||||
return;
|
||||
}
|
||||
|
||||
list_del(&dev_state->list);
|
||||
|
||||
spin_unlock_irqrestore(&state_lock, flags);
|
||||
|
||||
/* Get rid of any remaining pasid states */
|
||||
free_pasid_states(dev_state);
|
||||
|
||||
put_device_state(dev_state);
|
||||
/*
|
||||
* Wait until the last reference is dropped before freeing
|
||||
* the device state.
|
||||
*/
|
||||
wait_event(dev_state->wq, !atomic_read(&dev_state->count));
|
||||
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;
|
||||
u16 devid;
|
||||
int ret;
|
||||
|
||||
if (!amd_iommu_v2_supported())
|
||||
return -ENODEV;
|
||||
|
||||
devid = device_id(pdev);
|
||||
|
||||
spin_lock_irqsave(&state_lock, flags);
|
||||
|
||||
ret = -EINVAL;
|
||||
dev_state = __get_device_state(devid);
|
||||
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;
|
||||
u16 devid;
|
||||
int ret;
|
||||
|
||||
if (!amd_iommu_v2_supported())
|
||||
return -ENODEV;
|
||||
|
||||
devid = device_id(pdev);
|
||||
|
||||
spin_lock_irqsave(&state_lock, flags);
|
||||
|
||||
ret = -EINVAL;
|
||||
dev_state = __get_device_state(devid);
|
||||
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;
|
||||
|
||||
pr_info("AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>\n");
|
||||
|
||||
if (!amd_iommu_v2_supported()) {
|
||||
pr_info("AMD IOMMUv2 functionality not available on this system\n");
|
||||
/*
|
||||
* Load anyway to provide the symbols to other modules
|
||||
* which may use AMD IOMMUv2 optionally.
|
||||
*/
|
||||
return 0;
|
||||
}
|
||||
|
||||
spin_lock_init(&state_lock);
|
||||
|
||||
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);
|
||||
|
||||
return 0;
|
||||
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit amd_iommu_v2_exit(void)
|
||||
{
|
||||
struct device_state *dev_state;
|
||||
int i;
|
||||
|
||||
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
|
||||
*/
|
||||
for (i = 0; i < MAX_DEVICES; ++i) {
|
||||
dev_state = get_device_state(i);
|
||||
|
||||
if (dev_state == NULL)
|
||||
continue;
|
||||
|
||||
WARN_ON_ONCE(1);
|
||||
|
||||
put_device_state(dev_state);
|
||||
amd_iommu_free_device(dev_state->pdev);
|
||||
}
|
||||
|
||||
destroy_workqueue(iommu_wq);
|
||||
}
|
||||
|
||||
module_init(amd_iommu_v2_init);
|
||||
module_exit(amd_iommu_v2_exit);
|
||||
Reference in New Issue
Block a user