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/*
* Copyright 2018 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/printk.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/amd-iommu.h>
#include "kfd_priv.h"
#include "kfd_dbgmgr.h"
#include "kfd_topology.h"
#include "kfd_iommu.h"
static const u32 required_iommu_flags = AMD_IOMMU_DEVICE_FLAG_ATS_SUP |
AMD_IOMMU_DEVICE_FLAG_PRI_SUP |
AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
/** kfd_iommu_check_device - Check whether IOMMU is available for device
*/
int kfd_iommu_check_device(struct kfd_dev *kfd)
{
struct amd_iommu_device_info iommu_info;
int err;
if (!kfd->device_info->needs_iommu_device)
return -ENODEV;
iommu_info.flags = 0;
err = amd_iommu_device_info(kfd->pdev, &iommu_info);
if (err)
return err;
if ((iommu_info.flags & required_iommu_flags) != required_iommu_flags)
return -ENODEV;
return 0;
}
/** kfd_iommu_device_init - Initialize IOMMU for device
*/
int kfd_iommu_device_init(struct kfd_dev *kfd)
{
struct amd_iommu_device_info iommu_info;
unsigned int pasid_limit;
int err;
if (!kfd->device_info->needs_iommu_device)
return 0;
iommu_info.flags = 0;
err = amd_iommu_device_info(kfd->pdev, &iommu_info);
if (err < 0) {
dev_err(kfd_device,
"error getting iommu info. is the iommu enabled?\n");
return -ENODEV;
}
if ((iommu_info.flags & required_iommu_flags) != required_iommu_flags) {
dev_err(kfd_device,
"error required iommu flags ats %i, pri %i, pasid %i\n",
(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_ATS_SUP) != 0,
(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PRI_SUP) != 0,
(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PASID_SUP)
!= 0);
return -ENODEV;
}
pasid_limit = min_t(unsigned int,
(unsigned int)(1 << kfd->device_info->max_pasid_bits),
iommu_info.max_pasids);
if (!kfd_set_pasid_limit(pasid_limit)) {
dev_err(kfd_device, "error setting pasid limit\n");
return -EBUSY;
}
return 0;
}
/** kfd_iommu_bind_process_to_device - Have the IOMMU bind a process
*
* Binds the given process to the given device using its PASID. This
* enables IOMMUv2 address translation for the process on the device.
*
* This function assumes that the process mutex is held.
*/
int kfd_iommu_bind_process_to_device(struct kfd_process_device *pdd)
{
struct kfd_dev *dev = pdd->dev;
struct kfd_process *p = pdd->process;
int err;
if (!dev->device_info->needs_iommu_device || pdd->bound == PDD_BOUND)
return 0;
if (unlikely(pdd->bound == PDD_BOUND_SUSPENDED)) {
pr_err("Binding PDD_BOUND_SUSPENDED pdd is unexpected!\n");
return -EINVAL;
}
err = amd_iommu_bind_pasid(dev->pdev, p->pasid, p->lead_thread);
if (!err)
pdd->bound = PDD_BOUND;
return err;
}
/** kfd_iommu_unbind_process - Unbind process from all devices
*
* This removes all IOMMU device bindings of the process. To be used
* before process termination.
*/
void kfd_iommu_unbind_process(struct kfd_process *p)
{
struct kfd_process_device *pdd;
list_for_each_entry(pdd, &p->per_device_data, per_device_list)
if (pdd->bound == PDD_BOUND)
amd_iommu_unbind_pasid(pdd->dev->pdev, p->pasid);
}
/* Callback for process shutdown invoked by the IOMMU driver */
static void iommu_pasid_shutdown_callback(struct pci_dev *pdev, int pasid)
{
struct kfd_dev *dev = kfd_device_by_pci_dev(pdev);
struct kfd_process *p;
struct kfd_process_device *pdd;
if (!dev)
return;
/*
* Look for the process that matches the pasid. If there is no such
* process, we either released it in amdkfd's own notifier, or there
* is a bug. Unfortunately, there is no way to tell...
*/
p = kfd_lookup_process_by_pasid(pasid);
if (!p)
return;
pr_debug("Unbinding process 0x%x from IOMMU\n", pasid);
mutex_lock(kfd_get_dbgmgr_mutex());
if (dev->dbgmgr && dev->dbgmgr->pasid == p->pasid) {
if (!kfd_dbgmgr_unregister(dev->dbgmgr, p)) {
kfd_dbgmgr_destroy(dev->dbgmgr);
dev->dbgmgr = NULL;
}
}
mutex_unlock(kfd_get_dbgmgr_mutex());
mutex_lock(&p->mutex);
pdd = kfd_get_process_device_data(dev, p);
if (pdd)
/* For GPU relying on IOMMU, we need to dequeue here
* when PASID is still bound.
*/
kfd_process_dequeue_from_device(pdd);
mutex_unlock(&p->mutex);
kfd_unref_process(p);
}
/* This function called by IOMMU driver on PPR failure */
static int iommu_invalid_ppr_cb(struct pci_dev *pdev, int pasid,
unsigned long address, u16 flags)
{
struct kfd_dev *dev;
dev_warn_ratelimited(kfd_device,
"Invalid PPR device %x:%x.%x pasid 0x%x address 0x%lX flags 0x%X",
pdev->bus->number,
PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn),
pasid,
address,
flags);
dev = kfd_device_by_pci_dev(pdev);
if (!WARN_ON(!dev))
kfd_signal_iommu_event(dev, pasid, address,
flags & PPR_FAULT_WRITE, flags & PPR_FAULT_EXEC);
return AMD_IOMMU_INV_PRI_RSP_INVALID;
}
/*
* Bind processes do the device that have been temporarily unbound
* (PDD_BOUND_SUSPENDED) in kfd_unbind_processes_from_device.
*/
static int kfd_bind_processes_to_device(struct kfd_dev *kfd)
{
struct kfd_process_device *pdd;
struct kfd_process *p;
unsigned int temp;
int err = 0;
int idx = srcu_read_lock(&kfd_processes_srcu);
hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
mutex_lock(&p->mutex);
pdd = kfd_get_process_device_data(kfd, p);
if (WARN_ON(!pdd) || pdd->bound != PDD_BOUND_SUSPENDED) {
mutex_unlock(&p->mutex);
continue;
}
err = amd_iommu_bind_pasid(kfd->pdev, p->pasid,
p->lead_thread);
if (err < 0) {
pr_err("Unexpected pasid 0x%x binding failure\n",
p->pasid);
mutex_unlock(&p->mutex);
break;
}
pdd->bound = PDD_BOUND;
mutex_unlock(&p->mutex);
}
srcu_read_unlock(&kfd_processes_srcu, idx);
return err;
}
/*
* Mark currently bound processes as PDD_BOUND_SUSPENDED. These
* processes will be restored to PDD_BOUND state in
* kfd_bind_processes_to_device.
*/
static void kfd_unbind_processes_from_device(struct kfd_dev *kfd)
{
struct kfd_process_device *pdd;
struct kfd_process *p;
unsigned int temp;
int idx = srcu_read_lock(&kfd_processes_srcu);
hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
mutex_lock(&p->mutex);
pdd = kfd_get_process_device_data(kfd, p);
if (WARN_ON(!pdd)) {
mutex_unlock(&p->mutex);
continue;
}
if (pdd->bound == PDD_BOUND)
pdd->bound = PDD_BOUND_SUSPENDED;
mutex_unlock(&p->mutex);
}
srcu_read_unlock(&kfd_processes_srcu, idx);
}
/** kfd_iommu_suspend - Prepare IOMMU for suspend
*
* This unbinds processes from the device and disables the IOMMU for
* the device.
*/
void kfd_iommu_suspend(struct kfd_dev *kfd)
{
if (!kfd->device_info->needs_iommu_device)
return;
kfd_unbind_processes_from_device(kfd);
amd_iommu_set_invalidate_ctx_cb(kfd->pdev, NULL);
amd_iommu_set_invalid_ppr_cb(kfd->pdev, NULL);
amd_iommu_free_device(kfd->pdev);
}
/** kfd_iommu_resume - Restore IOMMU after resume
*
* This reinitializes the IOMMU for the device and re-binds previously
* suspended processes to the device.
*/
int kfd_iommu_resume(struct kfd_dev *kfd)
{
unsigned int pasid_limit;
int err;
if (!kfd->device_info->needs_iommu_device)
return 0;
pasid_limit = kfd_get_pasid_limit();
err = amd_iommu_init_device(kfd->pdev, pasid_limit);
if (err)
return -ENXIO;
amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
iommu_pasid_shutdown_callback);
amd_iommu_set_invalid_ppr_cb(kfd->pdev,
iommu_invalid_ppr_cb);
err = kfd_bind_processes_to_device(kfd);
if (err) {
amd_iommu_set_invalidate_ctx_cb
|