Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1101 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
new file mode 100644
index 000000000..4694386cc
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -0,0 +1,1101 @@
+/*
+ * Copyright 2014 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/mutex.h>
+#include <linux/log2.h>
+#include <linux/sched.h>
+#include <linux/sched/mm.h>
+#include <linux/sched/task.h>
+#include <linux/slab.h>
+#include <linux/amd-iommu.h>
+#include <linux/notifier.h>
+#include <linux/compat.h>
+#include <linux/mman.h>
+#include <linux/file.h>
+
+struct mm_struct;
+
+#include "kfd_priv.h"
+#include "kfd_device_queue_manager.h"
+#include "kfd_dbgmgr.h"
+#include "kfd_iommu.h"
+
+/*
+ * List of struct kfd_process (field kfd_process).
+ * Unique/indexed by mm_struct*
+ */
+DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE);
+static DEFINE_MUTEX(kfd_processes_mutex);
+
+DEFINE_SRCU(kfd_processes_srcu);
+
+/* For process termination handling */
+static struct workqueue_struct *kfd_process_wq;
+
+/* Ordered, single-threaded workqueue for restoring evicted
+ * processes. Restoring multiple processes concurrently under memory
+ * pressure can lead to processes blocking each other from validating
+ * their BOs and result in a live-lock situation where processes
+ * remain evicted indefinitely.
+ */
+static struct workqueue_struct *kfd_restore_wq;
+
+static struct kfd_process *find_process(const struct task_struct *thread);
+static void kfd_process_ref_release(struct kref *ref);
+static struct kfd_process *create_process(const struct task_struct *thread,
+					struct file *filep);
+
+static void evict_process_worker(struct work_struct *work);
+static void restore_process_worker(struct work_struct *work);
+
+
+int kfd_process_create_wq(void)
+{
+	if (!kfd_process_wq)
+		kfd_process_wq = alloc_workqueue("kfd_process_wq", 0, 0);
+	if (!kfd_restore_wq)
+		kfd_restore_wq = alloc_ordered_workqueue("kfd_restore_wq", 0);
+
+	if (!kfd_process_wq || !kfd_restore_wq) {
+		kfd_process_destroy_wq();
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void kfd_process_destroy_wq(void)
+{
+	if (kfd_process_wq) {
+		destroy_workqueue(kfd_process_wq);
+		kfd_process_wq = NULL;
+	}
+	if (kfd_restore_wq) {
+		destroy_workqueue(kfd_restore_wq);
+		kfd_restore_wq = NULL;
+	}
+}
+
+static void kfd_process_free_gpuvm(struct kgd_mem *mem,
+			struct kfd_process_device *pdd)
+{
+	struct kfd_dev *dev = pdd->dev;
+
+	dev->kfd2kgd->unmap_memory_to_gpu(dev->kgd, mem, pdd->vm);
+	dev->kfd2kgd->free_memory_of_gpu(dev->kgd, mem);
+}
+
+/* kfd_process_alloc_gpuvm - Allocate GPU VM for the KFD process
+ *	This function should be only called right after the process
+ *	is created and when kfd_processes_mutex is still being held
+ *	to avoid concurrency. Because of that exclusiveness, we do
+ *	not need to take p->mutex.
+ */
+static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd,
+				   uint64_t gpu_va, uint32_t size,
+				   uint32_t flags, void **kptr)
+{
+	struct kfd_dev *kdev = pdd->dev;
+	struct kgd_mem *mem = NULL;
+	int handle;
+	int err;
+
+	err = kdev->kfd2kgd->alloc_memory_of_gpu(kdev->kgd, gpu_va, size,
+						 pdd->vm, &mem, NULL, flags);
+	if (err)
+		goto err_alloc_mem;
+
+	err = kdev->kfd2kgd->map_memory_to_gpu(kdev->kgd, mem, pdd->vm);
+	if (err)
+		goto err_map_mem;
+
+	err = kdev->kfd2kgd->sync_memory(kdev->kgd, mem, true);
+	if (err) {
+		pr_debug("Sync memory failed, wait interrupted by user signal\n");
+		goto sync_memory_failed;
+	}
+
+	/* Create an obj handle so kfd_process_device_remove_obj_handle
+	 * will take care of the bo removal when the process finishes.
+	 * We do not need to take p->mutex, because the process is just
+	 * created and the ioctls have not had the chance to run.
+	 */
+	handle = kfd_process_device_create_obj_handle(pdd, mem);
+
+	if (handle < 0) {
+		err = handle;
+		goto free_gpuvm;
+	}
+
+	if (kptr) {
+		err = kdev->kfd2kgd->map_gtt_bo_to_kernel(kdev->kgd,
+				(struct kgd_mem *)mem, kptr, NULL);
+		if (err) {
+			pr_debug("Map GTT BO to kernel failed\n");
+			goto free_obj_handle;
+		}
+	}
+
+	return err;
+
+free_obj_handle:
+	kfd_process_device_remove_obj_handle(pdd, handle);
+free_gpuvm:
+sync_memory_failed:
+	kfd_process_free_gpuvm(mem, pdd);
+	return err;
+
+err_map_mem:
+	kdev->kfd2kgd->free_memory_of_gpu(kdev->kgd, mem);
+err_alloc_mem:
+	*kptr = NULL;
+	return err;
+}
+
+/* kfd_process_device_reserve_ib_mem - Reserve memory inside the
+ *	process for IB usage The memory reserved is for KFD to submit
+ *	IB to AMDGPU from kernel.  If the memory is reserved
+ *	successfully, ib_kaddr will have the CPU/kernel
+ *	address. Check ib_kaddr before accessing the memory.
+ */
+static int kfd_process_device_reserve_ib_mem(struct kfd_process_device *pdd)
+{
+	struct qcm_process_device *qpd = &pdd->qpd;
+	uint32_t flags = ALLOC_MEM_FLAGS_GTT |
+			 ALLOC_MEM_FLAGS_NO_SUBSTITUTE |
+			 ALLOC_MEM_FLAGS_WRITABLE |
+			 ALLOC_MEM_FLAGS_EXECUTABLE;
+	void *kaddr;
+	int ret;
+
+	if (qpd->ib_kaddr || !qpd->ib_base)
+		return 0;
+
+	/* ib_base is only set for dGPU */
+	ret = kfd_process_alloc_gpuvm(pdd, qpd->ib_base, PAGE_SIZE, flags,
+				      &kaddr);
+	if (ret)
+		return ret;
+
+	qpd->ib_kaddr = kaddr;
+
+	return 0;
+}
+
+struct kfd_process *kfd_create_process(struct file *filep)
+{
+	struct kfd_process *process;
+	struct task_struct *thread = current;
+
+	if (!thread->mm)
+		return ERR_PTR(-EINVAL);
+
+	/* Only the pthreads threading model is supported. */
+	if (thread->group_leader->mm != thread->mm)
+		return ERR_PTR(-EINVAL);
+
+	/*
+	 * take kfd processes mutex before starting of process creation
+	 * so there won't be a case where two threads of the same process
+	 * create two kfd_process structures
+	 */
+	mutex_lock(&kfd_processes_mutex);
+
+	/* A prior open of /dev/kfd could have already created the process. */
+	process = find_process(thread);
+	if (process)
+		pr_debug("Process already found\n");
+	else
+		process = create_process(thread, filep);
+
+	mutex_unlock(&kfd_processes_mutex);
+
+	return process;
+}
+
+struct kfd_process *kfd_get_process(const struct task_struct *thread)
+{
+	struct kfd_process *process;
+
+	if (!thread->mm)
+		return ERR_PTR(-EINVAL);
+
+	/* Only the pthreads threading model is supported. */
+	if (thread->group_leader->mm != thread->mm)
+		return ERR_PTR(-EINVAL);
+
+	process = find_process(thread);
+	if (!process)
+		return ERR_PTR(-EINVAL);
+
+	return process;
+}
+
+static struct kfd_process *find_process_by_mm(const struct mm_struct *mm)
+{
+	struct kfd_process *process;
+
+	hash_for_each_possible_rcu(kfd_processes_table, process,
+					kfd_processes, (uintptr_t)mm)
+		if (process->mm == mm)
+			return process;
+
+	return NULL;
+}
+
+static struct kfd_process *find_process(const struct task_struct *thread)
+{
+	struct kfd_process *p;
+	int idx;
+
+	idx = srcu_read_lock(&kfd_processes_srcu);
+	p = find_process_by_mm(thread->mm);
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+
+	return p;
+}
+
+void kfd_unref_process(struct kfd_process *p)
+{
+	kref_put(&p->ref, kfd_process_ref_release);
+}
+
+static void kfd_process_device_free_bos(struct kfd_process_device *pdd)
+{
+	struct kfd_process *p = pdd->process;
+	void *mem;
+	int id;
+
+	/*
+	 * Remove all handles from idr and release appropriate
+	 * local memory object
+	 */
+	idr_for_each_entry(&pdd->alloc_idr, mem, id) {
+		struct kfd_process_device *peer_pdd;
+
+		list_for_each_entry(peer_pdd, &p->per_device_data,
+				    per_device_list) {
+			if (!peer_pdd->vm)
+				continue;
+			peer_pdd->dev->kfd2kgd->unmap_memory_to_gpu(
+				peer_pdd->dev->kgd, mem, peer_pdd->vm);
+		}
+
+		pdd->dev->kfd2kgd->free_memory_of_gpu(pdd->dev->kgd, mem);
+		kfd_process_device_remove_obj_handle(pdd, id);
+	}
+}
+
+static void kfd_process_free_outstanding_kfd_bos(struct kfd_process *p)
+{
+	struct kfd_process_device *pdd;
+
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list)
+		kfd_process_device_free_bos(pdd);
+}
+
+static void kfd_process_destroy_pdds(struct kfd_process *p)
+{
+	struct kfd_process_device *pdd, *temp;
+
+	list_for_each_entry_safe(pdd, temp, &p->per_device_data,
+				 per_device_list) {
+		pr_debug("Releasing pdd (topology id %d) for process (pasid %d)\n",
+				pdd->dev->id, p->pasid);
+
+		if (pdd->drm_file)
+			fput(pdd->drm_file);
+		else if (pdd->vm)
+			pdd->dev->kfd2kgd->destroy_process_vm(
+				pdd->dev->kgd, pdd->vm);
+
+		list_del(&pdd->per_device_list);
+
+		if (pdd->qpd.cwsr_kaddr && !pdd->qpd.cwsr_base)
+			free_pages((unsigned long)pdd->qpd.cwsr_kaddr,
+				get_order(KFD_CWSR_TBA_TMA_SIZE));
+
+		kfree(pdd->qpd.doorbell_bitmap);
+		idr_destroy(&pdd->alloc_idr);
+
+		kfree(pdd);
+	}
+}
+
+/* No process locking is needed in this function, because the process
+ * is not findable any more. We must assume that no other thread is
+ * using it any more, otherwise we couldn't safely free the process
+ * structure in the end.
+ */
+static void kfd_process_wq_release(struct work_struct *work)
+{
+	struct kfd_process *p = container_of(work, struct kfd_process,
+					     release_work);
+
+	kfd_iommu_unbind_process(p);
+
+	kfd_process_free_outstanding_kfd_bos(p);
+
+	kfd_process_destroy_pdds(p);
+	dma_fence_put(p->ef);
+
+	kfd_event_free_process(p);
+
+	kfd_pasid_free(p->pasid);
+	kfd_free_process_doorbells(p);
+
+	mutex_destroy(&p->mutex);
+
+	put_task_struct(p->lead_thread);
+
+	kfree(p);
+}
+
+static void kfd_process_ref_release(struct kref *ref)
+{
+	struct kfd_process *p = container_of(ref, struct kfd_process, ref);
+
+	INIT_WORK(&p->release_work, kfd_process_wq_release);
+	queue_work(kfd_process_wq, &p->release_work);
+}
+
+static void kfd_process_destroy_delayed(struct rcu_head *rcu)
+{
+	struct kfd_process *p = container_of(rcu, struct kfd_process, rcu);
+
+	kfd_unref_process(p);
+}
+
+static void kfd_process_notifier_release(struct mmu_notifier *mn,
+					struct mm_struct *mm)
+{
+	struct kfd_process *p;
+	struct kfd_process_device *pdd = NULL;
+
+	/*
+	 * The kfd_process structure can not be free because the
+	 * mmu_notifier srcu is read locked
+	 */
+	p = container_of(mn, struct kfd_process, mmu_notifier);
+	if (WARN_ON(p->mm != mm))
+		return;
+
+	mutex_lock(&kfd_processes_mutex);
+	hash_del_rcu(&p->kfd_processes);
+	mutex_unlock(&kfd_processes_mutex);
+	synchronize_srcu(&kfd_processes_srcu);
+
+	cancel_delayed_work_sync(&p->eviction_work);
+	cancel_delayed_work_sync(&p->restore_work);
+
+	mutex_lock(&p->mutex);
+
+	/* Iterate over all process device data structures and if the
+	 * pdd is in debug mode, we should first force unregistration,
+	 * then we will be able to destroy the queues
+	 */
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
+		struct kfd_dev *dev = pdd->dev;
+
+		mutex_lock(kfd_get_dbgmgr_mutex());
+		if (dev && 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());
+	}
+
+	kfd_process_dequeue_from_all_devices(p);
+	pqm_uninit(&p->pqm);
+
+	/* Indicate to other users that MM is no longer valid */
+	p->mm = NULL;
+
+	mutex_unlock(&p->mutex);
+
+	mmu_notifier_unregister_no_release(&p->mmu_notifier, mm);
+	mmu_notifier_call_srcu(&p->rcu, &kfd_process_destroy_delayed);
+}
+
+static const struct mmu_notifier_ops kfd_process_mmu_notifier_ops = {
+	.release = kfd_process_notifier_release,
+};
+
+static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep)
+{
+	unsigned long  offset;
+	struct kfd_process_device *pdd;
+
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
+		struct kfd_dev *dev = pdd->dev;
+		struct qcm_process_device *qpd = &pdd->qpd;
+
+		if (!dev->cwsr_enabled || qpd->cwsr_kaddr || qpd->cwsr_base)
+			continue;
+
+		offset = (KFD_MMAP_TYPE_RESERVED_MEM | KFD_MMAP_GPU_ID(dev->id))
+			<< PAGE_SHIFT;
+		qpd->tba_addr = (int64_t)vm_mmap(filep, 0,
+			KFD_CWSR_TBA_TMA_SIZE, PROT_READ | PROT_EXEC,
+			MAP_SHARED, offset);
+
+		if (IS_ERR_VALUE(qpd->tba_addr)) {
+			int err = qpd->tba_addr;
+
+			pr_err("Failure to set tba address. error %d.\n", err);
+			qpd->tba_addr = 0;
+			qpd->cwsr_kaddr = NULL;
+			return err;
+		}
+
+		memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
+
+		qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
+		pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
+			qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
+	}
+
+	return 0;
+}
+
+static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd)
+{
+	struct kfd_dev *dev = pdd->dev;
+	struct qcm_process_device *qpd = &pdd->qpd;
+	uint32_t flags = ALLOC_MEM_FLAGS_GTT |
+		ALLOC_MEM_FLAGS_NO_SUBSTITUTE | ALLOC_MEM_FLAGS_EXECUTABLE;
+	void *kaddr;
+	int ret;
+
+	if (!dev->cwsr_enabled || qpd->cwsr_kaddr || !qpd->cwsr_base)
+		return 0;
+
+	/* cwsr_base is only set for dGPU */
+	ret = kfd_process_alloc_gpuvm(pdd, qpd->cwsr_base,
+				      KFD_CWSR_TBA_TMA_SIZE, flags, &kaddr);
+	if (ret)
+		return ret;
+
+	qpd->cwsr_kaddr = kaddr;
+	qpd->tba_addr = qpd->cwsr_base;
+
+	memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
+
+	qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
+	pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
+		 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
+
+	return 0;
+}
+
+static struct kfd_process *create_process(const struct task_struct *thread,
+					struct file *filep)
+{
+	struct kfd_process *process;
+	int err = -ENOMEM;
+
+	process = kzalloc(sizeof(*process), GFP_KERNEL);
+
+	if (!process)
+		goto err_alloc_process;
+
+	process->pasid = kfd_pasid_alloc();
+	if (process->pasid == 0)
+		goto err_alloc_pasid;
+
+	if (kfd_alloc_process_doorbells(process) < 0)
+		goto err_alloc_doorbells;
+
+	kref_init(&process->ref);
+
+	mutex_init(&process->mutex);
+
+	process->mm = thread->mm;
+
+	/* register notifier */
+	process->mmu_notifier.ops = &kfd_process_mmu_notifier_ops;
+	err = mmu_notifier_register(&process->mmu_notifier, process->mm);
+	if (err)
+		goto err_mmu_notifier;
+
+	hash_add_rcu(kfd_processes_table, &process->kfd_processes,
+			(uintptr_t)process->mm);
+
+	process->lead_thread = thread->group_leader;
+	get_task_struct(process->lead_thread);
+
+	INIT_LIST_HEAD(&process->per_device_data);
+
+	kfd_event_init_process(process);
+
+	err = pqm_init(&process->pqm, process);
+	if (err != 0)
+		goto err_process_pqm_init;
+
+	/* init process apertures*/
+	process->is_32bit_user_mode = in_compat_syscall();
+	err = kfd_init_apertures(process);
+	if (err != 0)
+		goto err_init_apertures;
+
+	INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker);
+	INIT_DELAYED_WORK(&process->restore_work, restore_process_worker);
+	process->last_restore_timestamp = get_jiffies_64();
+
+	err = kfd_process_init_cwsr_apu(process, filep);
+	if (err)
+		goto err_init_cwsr;
+
+	return process;
+
+err_init_cwsr:
+	kfd_process_free_outstanding_kfd_bos(process);
+	kfd_process_destroy_pdds(process);
+err_init_apertures:
+	pqm_uninit(&process->pqm);
+err_process_pqm_init:
+	hash_del_rcu(&process->kfd_processes);
+	synchronize_rcu();
+	mmu_notifier_unregister_no_release(&process->mmu_notifier, process->mm);
+err_mmu_notifier:
+	mutex_destroy(&process->mutex);
+	kfd_free_process_doorbells(process);
+err_alloc_doorbells:
+	kfd_pasid_free(process->pasid);
+err_alloc_pasid:
+	kfree(process);
+err_alloc_process:
+	return ERR_PTR(err);
+}
+
+static int init_doorbell_bitmap(struct qcm_process_device *qpd,
+			struct kfd_dev *dev)
+{
+	unsigned int i;
+
+	if (!KFD_IS_SOC15(dev->device_info->asic_family))
+		return 0;
+
+	qpd->doorbell_bitmap =
+		kzalloc(DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
+				     BITS_PER_BYTE), GFP_KERNEL);
+	if (!qpd->doorbell_bitmap)
+		return -ENOMEM;
+
+	/* Mask out any reserved doorbells */
+	for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS; i++)
+		if ((dev->shared_resources.reserved_doorbell_mask & i) ==
+		    dev->shared_resources.reserved_doorbell_val) {
+			set_bit(i, qpd->doorbell_bitmap);
+			pr_debug("reserved doorbell 0x%03x\n", i);
+		}
+
+	return 0;
+}
+
+struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
+							struct kfd_process *p)
+{
+	struct kfd_process_device *pdd = NULL;
+
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list)
+		if (pdd->dev == dev)
+			return pdd;
+
+	return NULL;
+}
+
+struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
+							struct kfd_process *p)
+{
+	struct kfd_process_device *pdd = NULL;
+
+	pdd = kzalloc(sizeof(*pdd), GFP_KERNEL);
+	if (!pdd)
+		return NULL;
+
+	if (init_doorbell_bitmap(&pdd->qpd, dev)) {
+		pr_err("Failed to init doorbell for process\n");
+		kfree(pdd);
+		return NULL;
+	}
+
+	pdd->dev = dev;
+	INIT_LIST_HEAD(&pdd->qpd.queues_list);
+	INIT_LIST_HEAD(&pdd->qpd.priv_queue_list);
+	pdd->qpd.dqm = dev->dqm;
+	pdd->qpd.pqm = &p->pqm;
+	pdd->qpd.evicted = 0;
+	pdd->process = p;
+	pdd->bound = PDD_UNBOUND;
+	pdd->already_dequeued = false;
+	list_add(&pdd->per_device_list, &p->per_device_data);
+
+	/* Init idr used for memory handle translation */
+	idr_init(&pdd->alloc_idr);
+
+	return pdd;
+}
+
+/**
+ * kfd_process_device_init_vm - Initialize a VM for a process-device
+ *
+ * @pdd: The process-device
+ * @drm_file: Optional pointer to a DRM file descriptor
+ *
+ * If @drm_file is specified, it will be used to acquire the VM from
+ * that file descriptor. If successful, the @pdd takes ownership of
+ * the file descriptor.
+ *
+ * If @drm_file is NULL, a new VM is created.
+ *
+ * Returns 0 on success, -errno on failure.
+ */
+int kfd_process_device_init_vm(struct kfd_process_device *pdd,
+			       struct file *drm_file)
+{
+	struct kfd_process *p;
+	struct kfd_dev *dev;
+	int ret;
+
+	if (pdd->vm)
+		return drm_file ? -EBUSY : 0;
+
+	p = pdd->process;
+	dev = pdd->dev;
+
+	if (drm_file)
+		ret = dev->kfd2kgd->acquire_process_vm(
+			dev->kgd, drm_file,
+			&pdd->vm, &p->kgd_process_info, &p->ef);
+	else
+		ret = dev->kfd2kgd->create_process_vm(
+			dev->kgd, &pdd->vm, &p->kgd_process_info, &p->ef);
+	if (ret) {
+		pr_err("Failed to create process VM object\n");
+		return ret;
+	}
+
+	ret = kfd_process_device_reserve_ib_mem(pdd);
+	if (ret)
+		goto err_reserve_ib_mem;
+	ret = kfd_process_device_init_cwsr_dgpu(pdd);
+	if (ret)
+		goto err_init_cwsr;
+
+	pdd->drm_file = drm_file;
+
+	return 0;
+
+err_init_cwsr:
+err_reserve_ib_mem:
+	kfd_process_device_free_bos(pdd);
+	if (!drm_file)
+		dev->kfd2kgd->destroy_process_vm(dev->kgd, pdd->vm);
+	pdd->vm = NULL;
+
+	return ret;
+}
+
+/*
+ * Direct the IOMMU to bind the process (specifically the pasid->mm)
+ * to the device.
+ * Unbinding occurs when the process dies or the device is removed.
+ *
+ * Assumes that the process lock is held.
+ */
+struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
+							struct kfd_process *p)
+{
+	struct kfd_process_device *pdd;
+	int err;
+
+	pdd = kfd_get_process_device_data(dev, p);
+	if (!pdd) {
+		pr_err("Process device data doesn't exist\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	err = kfd_iommu_bind_process_to_device(pdd);
+	if (err)
+		return ERR_PTR(err);
+
+	err = kfd_process_device_init_vm(pdd, NULL);
+	if (err)
+		return ERR_PTR(err);
+
+	return pdd;
+}
+
+struct kfd_process_device *kfd_get_first_process_device_data(
+						struct kfd_process *p)
+{
+	return list_first_entry(&p->per_device_data,
+				struct kfd_process_device,
+				per_device_list);
+}
+
+struct kfd_process_device *kfd_get_next_process_device_data(
+						struct kfd_process *p,
+						struct kfd_process_device *pdd)
+{
+	if (list_is_last(&pdd->per_device_list, &p->per_device_data))
+		return NULL;
+	return list_next_entry(pdd, per_device_list);
+}
+
+bool kfd_has_process_device_data(struct kfd_process *p)
+{
+	return !(list_empty(&p->per_device_data));
+}
+
+/* Create specific handle mapped to mem from process local memory idr
+ * Assumes that the process lock is held.
+ */
+int kfd_process_device_create_obj_handle(struct kfd_process_device *pdd,
+					void *mem)
+{
+	return idr_alloc(&pdd->alloc_idr, mem, 0, 0, GFP_KERNEL);
+}
+
+/* Translate specific handle from process local memory idr
+ * Assumes that the process lock is held.
+ */
+void *kfd_process_device_translate_handle(struct kfd_process_device *pdd,
+					int handle)
+{
+	if (handle < 0)
+		return NULL;
+
+	return idr_find(&pdd->alloc_idr, handle);
+}
+
+/* Remove specific handle from process local memory idr
+ * Assumes that the process lock is held.
+ */
+void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd,
+					int handle)
+{
+	if (handle >= 0)
+		idr_remove(&pdd->alloc_idr, handle);
+}
+
+/* This increments the process->ref counter. */
+struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid)
+{
+	struct kfd_process *p, *ret_p = NULL;
+	unsigned int temp;
+
+	int idx = srcu_read_lock(&kfd_processes_srcu);
+
+	hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
+		if (p->pasid == pasid) {
+			kref_get(&p->ref);
+			ret_p = p;
+			break;
+		}
+	}
+
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+
+	return ret_p;
+}
+
+/* This increments the process->ref counter. */
+struct kfd_process *kfd_lookup_process_by_mm(const struct mm_struct *mm)
+{
+	struct kfd_process *p;
+
+	int idx = srcu_read_lock(&kfd_processes_srcu);
+
+	p = find_process_by_mm(mm);
+	if (p)
+		kref_get(&p->ref);
+
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+
+	return p;
+}
+
+/* process_evict_queues - Evict all user queues of a process
+ *
+ * Eviction is reference-counted per process-device. This means multiple
+ * evictions from different sources can be nested safely.
+ */
+int kfd_process_evict_queues(struct kfd_process *p)
+{
+	struct kfd_process_device *pdd;
+	int r = 0;
+	unsigned int n_evicted = 0;
+
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
+		r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm,
+							    &pdd->qpd);
+		if (r) {
+			pr_err("Failed to evict process queues\n");
+			goto fail;
+		}
+		n_evicted++;
+	}
+
+	return r;
+
+fail:
+	/* To keep state consistent, roll back partial eviction by
+	 * restoring queues
+	 */
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
+		if (n_evicted == 0)
+			break;
+		if (pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
+							      &pdd->qpd))
+			pr_err("Failed to restore queues\n");
+
+		n_evicted--;
+	}
+
+	return r;
+}
+
+/* process_restore_queues - Restore all user queues of a process */
+int kfd_process_restore_queues(struct kfd_process *p)
+{
+	struct kfd_process_device *pdd;
+	int r, ret = 0;
+
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
+		r = pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
+							      &pdd->qpd);
+		if (r) {
+			pr_err("Failed to restore process queues\n");
+			if (!ret)
+				ret = r;
+		}
+	}
+
+	return ret;
+}
+
+static void evict_process_worker(struct work_struct *work)
+{
+	int ret;
+	struct kfd_process *p;
+	struct delayed_work *dwork;
+
+	dwork = to_delayed_work(work);
+
+	/* Process termination destroys this worker thread. So during the
+	 * lifetime of this thread, kfd_process p will be valid
+	 */
+	p = container_of(dwork, struct kfd_process, eviction_work);
+	WARN_ONCE(p->last_eviction_seqno != p->ef->seqno,
+		  "Eviction fence mismatch\n");
+
+	/* Narrow window of overlap between restore and evict work
+	 * item is possible. Once amdgpu_amdkfd_gpuvm_restore_process_bos
+	 * unreserves KFD BOs, it is possible to evicted again. But
+	 * restore has few more steps of finish. So lets wait for any
+	 * previous restore work to complete
+	 */
+	flush_delayed_work(&p->restore_work);
+
+	pr_debug("Started evicting pasid %d\n", p->pasid);
+	ret = kfd_process_evict_queues(p);
+	if (!ret) {
+		dma_fence_signal(p->ef);
+		dma_fence_put(p->ef);
+		p->ef = NULL;
+		queue_delayed_work(kfd_restore_wq, &p->restore_work,
+				msecs_to_jiffies(PROCESS_RESTORE_TIME_MS));
+
+		pr_debug("Finished evicting pasid %d\n", p->pasid);
+	} else
+		pr_err("Failed to evict queues of pasid %d\n", p->pasid);
+}
+
+static void restore_process_worker(struct work_struct *work)
+{
+	struct delayed_work *dwork;
+	struct kfd_process *p;
+	struct kfd_process_device *pdd;
+	int ret = 0;
+
+	dwork = to_delayed_work(work);
+
+	/* Process termination destroys this worker thread. So during the
+	 * lifetime of this thread, kfd_process p will be valid
+	 */
+	p = container_of(dwork, struct kfd_process, restore_work);
+
+	/* Call restore_process_bos on the first KGD device. This function
+	 * takes care of restoring the whole process including other devices.
+	 * Restore can fail if enough memory is not available. If so,
+	 * reschedule again.
+	 */
+	pdd = list_first_entry(&p->per_device_data,
+			       struct kfd_process_device,
+			       per_device_list);
+
+	pr_debug("Started restoring pasid %d\n", p->pasid);
+
+	/* Setting last_restore_timestamp before successful restoration.
+	 * Otherwise this would have to be set by KGD (restore_process_bos)
+	 * before KFD BOs are unreserved. If not, the process can be evicted
+	 * again before the timestamp is set.
+	 * If restore fails, the timestamp will be set again in the next
+	 * attempt. This would mean that the minimum GPU quanta would be
+	 * PROCESS_ACTIVE_TIME_MS - (time to execute the following two
+	 * functions)
+	 */
+
+	p->last_restore_timestamp = get_jiffies_64();
+	ret = pdd->dev->kfd2kgd->restore_process_bos(p->kgd_process_info,
+						     &p->ef);
+	if (ret) {
+		pr_debug("Failed to restore BOs of pasid %d, retry after %d ms\n",
+			 p->pasid, PROCESS_BACK_OFF_TIME_MS);
+		ret = queue_delayed_work(kfd_restore_wq, &p->restore_work,
+				msecs_to_jiffies(PROCESS_BACK_OFF_TIME_MS));
+		WARN(!ret, "reschedule restore work failed\n");
+		return;
+	}
+
+	ret = kfd_process_restore_queues(p);
+	if (!ret)
+		pr_debug("Finished restoring pasid %d\n", p->pasid);
+	else
+		pr_err("Failed to restore queues of pasid %d\n", p->pasid);
+}
+
+void kfd_suspend_all_processes(void)
+{
+	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) {
+		cancel_delayed_work_sync(&p->eviction_work);
+		cancel_delayed_work_sync(&p->restore_work);
+
+		if (kfd_process_evict_queues(p))
+			pr_err("Failed to suspend process %d\n", p->pasid);
+		dma_fence_signal(p->ef);
+		dma_fence_put(p->ef);
+		p->ef = NULL;
+	}
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+}
+
+int kfd_resume_all_processes(void)
+{
+	struct kfd_process *p;
+	unsigned int temp;
+	int ret = 0, idx = srcu_read_lock(&kfd_processes_srcu);
+
+	hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
+		if (!queue_delayed_work(kfd_restore_wq, &p->restore_work, 0)) {
+			pr_err("Restore process %d failed during resume\n",
+			       p->pasid);
+			ret = -EFAULT;
+		}
+	}
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+	return ret;
+}
+
+int kfd_reserved_mem_mmap(struct kfd_dev *dev, struct kfd_process *process,
+			  struct vm_area_struct *vma)
+{
+	struct kfd_process_device *pdd;
+	struct qcm_process_device *qpd;
+
+	if ((vma->vm_end - vma->vm_start) != KFD_CWSR_TBA_TMA_SIZE) {
+		pr_err("Incorrect CWSR mapping size.\n");
+		return -EINVAL;
+	}
+
+	pdd = kfd_get_process_device_data(dev, process);
+	if (!pdd)
+		return -EINVAL;
+	qpd = &pdd->qpd;
+
+	qpd->cwsr_kaddr = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+					get_order(KFD_CWSR_TBA_TMA_SIZE));
+	if (!qpd->cwsr_kaddr) {
+		pr_err("Error allocating per process CWSR buffer.\n");
+		return -ENOMEM;
+	}
+
+	vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND
+		| VM_NORESERVE | VM_DONTDUMP | VM_PFNMAP;
+	/* Mapping pages to user process */
+	return remap_pfn_range(vma, vma->vm_start,
+			       PFN_DOWN(__pa(qpd->cwsr_kaddr)),
+			       KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot);
+}
+
+void kfd_flush_tlb(struct kfd_process_device *pdd)
+{
+	struct kfd_dev *dev = pdd->dev;
+	const struct kfd2kgd_calls *f2g = dev->kfd2kgd;
+
+	if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) {
+		/* Nothing to flush until a VMID is assigned, which
+		 * only happens when the first queue is created.
+		 */
+		if (pdd->qpd.vmid)
+			f2g->invalidate_tlbs_vmid(dev->kgd, pdd->qpd.vmid);
+	} else {
+		f2g->invalidate_tlbs(dev->kgd, pdd->process->pasid);
+	}
+}
+
+#if defined(CONFIG_DEBUG_FS)
+
+int kfd_debugfs_mqds_by_process(struct seq_file *m, void *data)
+{
+	struct kfd_process *p;
+	unsigned int temp;
+	int r = 0;
+
+	int idx = srcu_read_lock(&kfd_processes_srcu);
+
+	hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
+		seq_printf(m, "Process %d PASID %d:\n",
+			   p->lead_thread->tgid, p->pasid);
+
+		mutex_lock(&p->mutex);
+		r = pqm_debugfs_mqds(m, &p->pqm);
+		mutex_unlock(&p->mutex);
+
+		if (r)
+			break;
+	}
+
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+
+	return r;
+}
+
+#endif