linux_dsm_epyc7002/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c
Yong Zhao eab69801cf drm/amdkfd: Avoid flooding dmesg on Raven due to IOMMU issues
On Raven Invalid PPRs (peripheral page requests) can be reported
because multiple PPRs can be still queued when memory is freed.
Apply a rate limit to avoid flooding the log in this case.

Signed-off-by: Yong Zhao <yong.zhao@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
2018-07-13 16:17:45 -04:00

358 lines
9.3 KiB
C

/*
* 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 %d 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 %d address 0x%lX flags 0x%X",
PCI_BUS_NUM(pdev->devfn),
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 %d 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(kfd->pdev, NULL);
amd_iommu_set_invalid_ppr_cb(kfd->pdev, NULL);
amd_iommu_free_device(kfd->pdev);
return err;
}
return 0;
}
extern bool amd_iommu_pc_supported(void);
extern u8 amd_iommu_pc_get_max_banks(u16 devid);
extern u8 amd_iommu_pc_get_max_counters(u16 devid);
/** kfd_iommu_add_perf_counters - Add IOMMU performance counters to topology
*/
int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev)
{
struct kfd_perf_properties *props;
if (!(kdev->node_props.capability & HSA_CAP_ATS_PRESENT))
return 0;
if (!amd_iommu_pc_supported())
return 0;
props = kfd_alloc_struct(props);
if (!props)
return -ENOMEM;
strcpy(props->block_name, "iommu");
props->max_concurrent = amd_iommu_pc_get_max_banks(0) *
amd_iommu_pc_get_max_counters(0); /* assume one iommu */
list_add_tail(&props->list, &kdev->perf_props);
return 0;
}