diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/kfd_iommu.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_iommu.c | 356 |
1 files changed, 0 insertions, 356 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c deleted file mode 100644 index 808ee010520a..000000000000 --- a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c +++ /dev/null @@ -1,356 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 OR MIT -/* - * Copyright 2018-2022 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/kconfig.h> - -#if IS_REACHABLE(CONFIG_AMD_IOMMU_V2) - -#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_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->use_iommu_v2) - return -ENODEV; - - iommu_info.flags = 0; - err = amd_iommu_device_info(kfd->adev->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->use_iommu_v2) - return 0; - - iommu_info.flags = 0; - err = amd_iommu_device_info(kfd->adev->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_node *dev = pdd->dev; - struct kfd_process *p = pdd->process; - int err; - - if (!dev->kfd->use_iommu_v2 || 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; - } - - if (!kfd_is_first_node(dev)) { - dev_warn_once(kfd_device, - "IOMMU supported only on first node\n"); - return 0; - } - - err = amd_iommu_bind_pasid(dev->adev->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) -{ - int i; - - for (i = 0; i < p->n_pdds; i++) - if ((p->pdds[i]->bound == PDD_BOUND) && - (kfd_is_first_node((p->pdds[i]->dev)))) - amd_iommu_unbind_pasid(p->pdds[i]->dev->adev->pdev, - p->pasid); -} - -/* Callback for process shutdown invoked by the IOMMU driver */ -static void iommu_pasid_shutdown_callback(struct pci_dev *pdev, u32 pasid) -{ - struct kfd_node *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(&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, u32 pasid, - unsigned long address, u16 flags) -{ - struct kfd_node *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_node *knode) -{ - 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(knode, p); - - if (WARN_ON(!pdd) || pdd->bound != PDD_BOUND_SUSPENDED) { - mutex_unlock(&p->mutex); - continue; - } - - err = amd_iommu_bind_pasid(knode->adev->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_node *knode) -{ - 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(knode, 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->use_iommu_v2) - return; - - kfd_unbind_processes_from_device(kfd->nodes[0]); - - amd_iommu_set_invalidate_ctx_cb(kfd->adev->pdev, NULL); - amd_iommu_set_invalid_ppr_cb(kfd->adev->pdev, NULL); - amd_iommu_free_device(kfd->adev->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->use_iommu_v2) - return 0; - - pasid_limit = kfd_get_pasid_limit(); - - err = amd_iommu_init_device(kfd->adev->pdev, pasid_limit); - if (err) - return -ENXIO; - - amd_iommu_set_invalidate_ctx_cb(kfd->adev->pdev, - iommu_pasid_shutdown_callback); - amd_iommu_set_invalid_ppr_cb(kfd->adev->pdev, - iommu_invalid_ppr_cb); - - err = kfd_bind_processes_to_device(kfd->nodes[0]); - if (err) { - amd_iommu_set_invalidate_ctx_cb(kfd->adev->pdev, NULL); - amd_iommu_set_invalid_ppr_cb(kfd->adev->pdev, NULL); - amd_iommu_free_device(kfd->adev->pdev); - return err; - } - - return 0; -} - -/** 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; -} - -#endif |