drm/amdgpu: Add GPUVM memory management functions for KFD

v2:
* Removed unused flags from struct kgd_mem
* Updated some comments
* Added a check to unmap_memory_from_gpu whether BO was mapped

v3: add mutex_destroy in relevant places

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

1 files changed, 1506 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
new file mode 100644
index 000000000000..e0371a9967b9
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -0,0 +1,1506 @@
+/*
+ * Copyright 2014-2018 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.
+ */
+
+#define pr_fmt(fmt) "kfd2kgd: " fmt
+
+#include <linux/list.h>
+#include <drm/drmP.h>
+#include "amdgpu_object.h"
+#include "amdgpu_vm.h"
+#include "amdgpu_amdkfd.h"
+
+/* Special VM and GART address alignment needed for VI pre-Fiji due to
+ * a HW bug.
+ */
+#define VI_BO_SIZE_ALIGN (0x8000)
+
+/* Impose limit on how much memory KFD can use */
+static struct {
+	uint64_t max_system_mem_limit;
+	int64_t system_mem_used;
+	spinlock_t mem_limit_lock;
+} kfd_mem_limit;
+
+/* Struct used for amdgpu_amdkfd_bo_validate */
+struct amdgpu_vm_parser {
+	uint32_t        domain;
+	bool            wait;
+};
+
+static const char * const domain_bit_to_string[] = {
+		"CPU",
+		"GTT",
+		"VRAM",
+		"GDS",
+		"GWS",
+		"OA"
+};
+
+#define domain_string(domain) domain_bit_to_string[ffs(domain)-1]
+
+
+
+static inline struct amdgpu_device *get_amdgpu_device(struct kgd_dev *kgd)
+{
+	return (struct amdgpu_device *)kgd;
+}
+
+static bool check_if_add_bo_to_vm(struct amdgpu_vm *avm,
+		struct kgd_mem *mem)
+{
+	struct kfd_bo_va_list *entry;
+
+	list_for_each_entry(entry, &mem->bo_va_list, bo_list)
+		if (entry->bo_va->base.vm == avm)
+			return false;
+
+	return true;
+}
+
+/* Set memory usage limits. Current, limits are
+ *  System (kernel) memory - 3/8th System RAM
+ */
+void amdgpu_amdkfd_gpuvm_init_mem_limits(void)
+{
+	struct sysinfo si;
+	uint64_t mem;
+
+	si_meminfo(&si);
+	mem = si.totalram - si.totalhigh;
+	mem *= si.mem_unit;
+
+	spin_lock_init(&kfd_mem_limit.mem_limit_lock);
+	kfd_mem_limit.max_system_mem_limit = (mem >> 1) - (mem >> 3);
+	pr_debug("Kernel memory limit %lluM\n",
+		(kfd_mem_limit.max_system_mem_limit >> 20));
+}
+
+static int amdgpu_amdkfd_reserve_system_mem_limit(struct amdgpu_device *adev,
+					      uint64_t size, u32 domain)
+{
+	size_t acc_size;
+	int ret = 0;
+
+	acc_size = ttm_bo_dma_acc_size(&adev->mman.bdev, size,
+				       sizeof(struct amdgpu_bo));
+
+	spin_lock(&kfd_mem_limit.mem_limit_lock);
+	if (domain == AMDGPU_GEM_DOMAIN_GTT) {
+		if (kfd_mem_limit.system_mem_used + (acc_size + size) >
+			kfd_mem_limit.max_system_mem_limit) {
+			ret = -ENOMEM;
+			goto err_no_mem;
+		}
+		kfd_mem_limit.system_mem_used += (acc_size + size);
+	}
+err_no_mem:
+	spin_unlock(&kfd_mem_limit.mem_limit_lock);
+	return ret;
+}
+
+static void unreserve_system_mem_limit(struct amdgpu_device *adev,
+				       uint64_t size, u32 domain)
+{
+	size_t acc_size;
+
+	acc_size = ttm_bo_dma_acc_size(&adev->mman.bdev, size,
+				       sizeof(struct amdgpu_bo));
+
+	spin_lock(&kfd_mem_limit.mem_limit_lock);
+	if (domain == AMDGPU_GEM_DOMAIN_GTT)
+		kfd_mem_limit.system_mem_used -= (acc_size + size);
+	WARN_ONCE(kfd_mem_limit.system_mem_used < 0,
+		  "kfd system memory accounting unbalanced");
+
+	spin_unlock(&kfd_mem_limit.mem_limit_lock);
+}
+
+void amdgpu_amdkfd_unreserve_system_memory_limit(struct amdgpu_bo *bo)
+{
+	spin_lock(&kfd_mem_limit.mem_limit_lock);
+
+	if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_GTT) {
+		kfd_mem_limit.system_mem_used -=
+			(bo->tbo.acc_size + amdgpu_bo_size(bo));
+	}
+	WARN_ONCE(kfd_mem_limit.system_mem_used < 0,
+		  "kfd system memory accounting unbalanced");
+
+	spin_unlock(&kfd_mem_limit.mem_limit_lock);
+}
+
+
+/* amdgpu_amdkfd_remove_eviction_fence - Removes eviction fence(s) from BO's
+ *  reservation object.
+ *
+ * @bo: [IN] Remove eviction fence(s) from this BO
+ * @ef: [IN] If ef is specified, then this eviction fence is removed if it
+ *  is present in the shared list.
+ * @ef_list: [OUT] Returns list of eviction fences. These fences are removed
+ *  from BO's reservation object shared list.
+ * @ef_count: [OUT] Number of fences in ef_list.
+ *
+ * NOTE: If called with ef_list, then amdgpu_amdkfd_add_eviction_fence must be
+ *  called to restore the eviction fences and to avoid memory leak. This is
+ *  useful for shared BOs.
+ * NOTE: Must be called with BO reserved i.e. bo->tbo.resv->lock held.
+ */
+static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
+					struct amdgpu_amdkfd_fence *ef,
+					struct amdgpu_amdkfd_fence ***ef_list,
+					unsigned int *ef_count)
+{
+	struct reservation_object_list *fobj;
+	struct reservation_object *resv;
+	unsigned int i = 0, j = 0, k = 0, shared_count;
+	unsigned int count = 0;
+	struct amdgpu_amdkfd_fence **fence_list;
+
+	if (!ef && !ef_list)
+		return -EINVAL;
+
+	if (ef_list) {
+		*ef_list = NULL;
+		*ef_count = 0;
+	}
+
+	resv = bo->tbo.resv;
+	fobj = reservation_object_get_list(resv);
+
+	if (!fobj)
+		return 0;
+
+	preempt_disable();
+	write_seqcount_begin(&resv->seq);
+
+	/* Go through all the shared fences in the resevation object. If
+	 * ef is specified and it exists in the list, remove it and reduce the
+	 * count. If ef is not specified, then get the count of eviction fences
+	 * present.
+	 */
+	shared_count = fobj->shared_count;
+	for (i = 0; i < shared_count; ++i) {
+		struct dma_fence *f;
+
+		f = rcu_dereference_protected(fobj->shared[i],
+					      reservation_object_held(resv));
+
+		if (ef) {
+			if (f->context == ef->base.context) {
+				dma_fence_put(f);
+				fobj->shared_count--;
+			} else {
+				RCU_INIT_POINTER(fobj->shared[j++], f);
+			}
+		} else if (to_amdgpu_amdkfd_fence(f))
+			count++;
+	}
+	write_seqcount_end(&resv->seq);
+	preempt_enable();
+
+	if (ef || !count)
+		return 0;
+
+	/* Alloc memory for count number of eviction fence pointers. Fill the
+	 * ef_list array and ef_count
+	 */
+	fence_list = kcalloc(count, sizeof(struct amdgpu_amdkfd_fence *),
+			     GFP_KERNEL);
+	if (!fence_list)
+		return -ENOMEM;
+
+	preempt_disable();
+	write_seqcount_begin(&resv->seq);
+
+	j = 0;
+	for (i = 0; i < shared_count; ++i) {
+		struct dma_fence *f;
+		struct amdgpu_amdkfd_fence *efence;
+
+		f = rcu_dereference_protected(fobj->shared[i],
+			reservation_object_held(resv));
+
+		efence = to_amdgpu_amdkfd_fence(f);
+		if (efence) {
+			fence_list[k++] = efence;
+			fobj->shared_count--;
+		} else {
+			RCU_INIT_POINTER(fobj->shared[j++], f);
+		}
+	}
+
+	write_seqcount_end(&resv->seq);
+	preempt_enable();
+
+	*ef_list = fence_list;
+	*ef_count = k;
+
+	return 0;
+}
+
+/* amdgpu_amdkfd_add_eviction_fence - Adds eviction fence(s) back into BO's
+ *  reservation object.
+ *
+ * @bo: [IN] Add eviction fences to this BO
+ * @ef_list: [IN] List of eviction fences to be added
+ * @ef_count: [IN] Number of fences in ef_list.
+ *
+ * NOTE: Must call amdgpu_amdkfd_remove_eviction_fence before calling this
+ *  function.
+ */
+static void amdgpu_amdkfd_add_eviction_fence(struct amdgpu_bo *bo,
+				struct amdgpu_amdkfd_fence **ef_list,
+				unsigned int ef_count)
+{
+	int i;
+
+	if (!ef_list || !ef_count)
+		return;
+
+	for (i = 0; i < ef_count; i++) {
+		amdgpu_bo_fence(bo, &ef_list[i]->base, true);
+		/* Re-adding the fence takes an additional reference. Drop that
+		 * reference.
+		 */
+		dma_fence_put(&ef_list[i]->base);
+	}
+
+	kfree(ef_list);
+}
+
+static int amdgpu_amdkfd_bo_validate(struct amdgpu_bo *bo, uint32_t domain,
+				     bool wait)
+{
+	struct ttm_operation_ctx ctx = { false, false };
+	int ret;
+
+	if (WARN(amdgpu_ttm_tt_get_usermm(bo->tbo.ttm),
+		 "Called with userptr BO"))
+		return -EINVAL;
+
+	amdgpu_ttm_placement_from_domain(bo, domain);
+
+	ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
+	if (ret)
+		goto validate_fail;
+	if (wait) {
+		struct amdgpu_amdkfd_fence **ef_list;
+		unsigned int ef_count;
+
+		ret = amdgpu_amdkfd_remove_eviction_fence(bo, NULL, &ef_list,
+							  &ef_count);
+		if (ret)
+			goto validate_fail;
+
+		ttm_bo_wait(&bo->tbo, false, false);
+		amdgpu_amdkfd_add_eviction_fence(bo, ef_list, ef_count);
+	}
+
+validate_fail:
+	return ret;
+}
+
+static int amdgpu_amdkfd_validate(void *param, struct amdgpu_bo *bo)
+{
+	struct amdgpu_vm_parser *p = param;
+
+	return amdgpu_amdkfd_bo_validate(bo, p->domain, p->wait);
+}
+
+/* vm_validate_pt_pd_bos - Validate page table and directory BOs
+ *
+ * Page directories are not updated here because huge page handling
+ * during page table updates can invalidate page directory entries
+ * again. Page directories are only updated after updating page
+ * tables.
+ */
+static int vm_validate_pt_pd_bos(struct amdkfd_vm *vm)
+{
+	struct amdgpu_bo *pd = vm->base.root.base.bo;
+	struct amdgpu_device *adev = amdgpu_ttm_adev(pd->tbo.bdev);
+	struct amdgpu_vm_parser param;
+	uint64_t addr, flags = AMDGPU_PTE_VALID;
+	int ret;
+
+	param.domain = AMDGPU_GEM_DOMAIN_VRAM;
+	param.wait = false;
+
+	ret = amdgpu_vm_validate_pt_bos(adev, &vm->base, amdgpu_amdkfd_validate,
+					&param);
+	if (ret) {
+		pr_err("amdgpu: failed to validate PT BOs\n");
+		return ret;
+	}
+
+	ret = amdgpu_amdkfd_validate(&param, pd);
+	if (ret) {
+		pr_err("amdgpu: failed to validate PD\n");
+		return ret;
+	}
+
+	addr = amdgpu_bo_gpu_offset(vm->base.root.base.bo);
+	amdgpu_gmc_get_vm_pde(adev, -1, &addr, &flags);
+	vm->pd_phys_addr = addr;
+
+	if (vm->base.use_cpu_for_update) {
+		ret = amdgpu_bo_kmap(pd, NULL);
+		if (ret) {
+			pr_err("amdgpu: failed to kmap PD, ret=%d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int sync_vm_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
+			 struct dma_fence *f)
+{
+	int ret = amdgpu_sync_fence(adev, sync, f, false);
+
+	/* Sync objects can't handle multiple GPUs (contexts) updating
+	 * sync->last_vm_update. Fortunately we don't need it for
+	 * KFD's purposes, so we can just drop that fence.
+	 */
+	if (sync->last_vm_update) {
+		dma_fence_put(sync->last_vm_update);
+		sync->last_vm_update = NULL;
+	}
+
+	return ret;
+}
+
+static int vm_update_pds(struct amdgpu_vm *vm, struct amdgpu_sync *sync)
+{
+	struct amdgpu_bo *pd = vm->root.base.bo;
+	struct amdgpu_device *adev = amdgpu_ttm_adev(pd->tbo.bdev);
+	int ret;
+
+	ret = amdgpu_vm_update_directories(adev, vm);
+	if (ret)
+		return ret;
+
+	return sync_vm_fence(adev, sync, vm->last_update);
+}
+
+/* add_bo_to_vm - Add a BO to a VM
+ *
+ * Everything that needs to bo done only once when a BO is first added
+ * to a VM. It can later be mapped and unmapped many times without
+ * repeating these steps.
+ *
+ * 1. Allocate and initialize BO VA entry data structure
+ * 2. Add BO to the VM
+ * 3. Determine ASIC-specific PTE flags
+ * 4. Alloc page tables and directories if needed
+ * 4a.  Validate new page tables and directories
+ */
+static int add_bo_to_vm(struct amdgpu_device *adev, struct kgd_mem *mem,
+		struct amdgpu_vm *avm, bool is_aql,
+		struct kfd_bo_va_list **p_bo_va_entry)
+{
+	int ret;
+	struct kfd_bo_va_list *bo_va_entry;
+	struct amdkfd_vm *kvm = container_of(avm,
+					     struct amdkfd_vm, base);
+	struct amdgpu_bo *pd = avm->root.base.bo;
+	struct amdgpu_bo *bo = mem->bo;
+	uint64_t va = mem->va;
+	struct list_head *list_bo_va = &mem->bo_va_list;
+	unsigned long bo_size = bo->tbo.mem.size;
+
+	if (!va) {
+		pr_err("Invalid VA when adding BO to VM\n");
+		return -EINVAL;
+	}
+
+	if (is_aql)
+		va += bo_size;
+
+	bo_va_entry = kzalloc(sizeof(*bo_va_entry), GFP_KERNEL);
+	if (!bo_va_entry)
+		return -ENOMEM;
+
+	pr_debug("\t add VA 0x%llx - 0x%llx to vm %p\n", va,
+			va + bo_size, avm);
+
+	/* Add BO to VM internal data structures*/
+	bo_va_entry->bo_va = amdgpu_vm_bo_add(adev, avm, bo);
+	if (!bo_va_entry->bo_va) {
+		ret = -EINVAL;
+		pr_err("Failed to add BO object to VM. ret == %d\n",
+				ret);
+		goto err_vmadd;
+	}
+
+	bo_va_entry->va = va;
+	bo_va_entry->pte_flags = amdgpu_gmc_get_pte_flags(adev,
+							 mem->mapping_flags);
+	bo_va_entry->kgd_dev = (void *)adev;
+	list_add(&bo_va_entry->bo_list, list_bo_va);
+
+	if (p_bo_va_entry)
+		*p_bo_va_entry = bo_va_entry;
+
+	/* Allocate new page tables if needed and validate
+	 * them. Clearing of new page tables and validate need to wait
+	 * on move fences. We don't want that to trigger the eviction
+	 * fence, so remove it temporarily.
+	 */
+	amdgpu_amdkfd_remove_eviction_fence(pd,
+					kvm->process_info->eviction_fence,
+					NULL, NULL);
+
+	ret = amdgpu_vm_alloc_pts(adev, avm, va, amdgpu_bo_size(bo));
+	if (ret) {
+		pr_err("Failed to allocate pts, err=%d\n", ret);
+		goto err_alloc_pts;
+	}
+
+	ret = vm_validate_pt_pd_bos(kvm);
+	if (ret) {
+		pr_err("validate_pt_pd_bos() failed\n");
+		goto err_alloc_pts;
+	}
+
+	/* Add the eviction fence back */
+	amdgpu_bo_fence(pd, &kvm->process_info->eviction_fence->base, true);
+
+	return 0;
+
+err_alloc_pts:
+	amdgpu_bo_fence(pd, &kvm->process_info->eviction_fence->base, true);
+	amdgpu_vm_bo_rmv(adev, bo_va_entry->bo_va);
+	list_del(&bo_va_entry->bo_list);
+err_vmadd:
+	kfree(bo_va_entry);
+	return ret;
+}
+
+static void remove_bo_from_vm(struct amdgpu_device *adev,
+		struct kfd_bo_va_list *entry, unsigned long size)
+{
+	pr_debug("\t remove VA 0x%llx - 0x%llx in entry %p\n",
+			entry->va,
+			entry->va + size, entry);
+	amdgpu_vm_bo_rmv(adev, entry->bo_va);
+	list_del(&entry->bo_list);
+	kfree(entry);
+}
+
+static void add_kgd_mem_to_kfd_bo_list(struct kgd_mem *mem,
+				struct amdkfd_process_info *process_info)
+{
+	struct ttm_validate_buffer *entry = &mem->validate_list;
+	struct amdgpu_bo *bo = mem->bo;
+
+	INIT_LIST_HEAD(&entry->head);
+	entry->shared = true;
+	entry->bo = &bo->tbo;
+	mutex_lock(&process_info->lock);
+	list_add_tail(&entry->head, &process_info->kfd_bo_list);
+	mutex_unlock(&process_info->lock);
+}
+
+/* Reserving a BO and its page table BOs must happen atomically to
+ * avoid deadlocks. Some operations update multiple VMs at once. Track
+ * all the reservation info in a context structure. Optionally a sync
+ * object can track VM updates.
+ */
+struct bo_vm_reservation_context {
+	struct amdgpu_bo_list_entry kfd_bo; /* BO list entry for the KFD BO */
+	unsigned int n_vms;		    /* Number of VMs reserved	    */
+	struct amdgpu_bo_list_entry *vm_pd; /* Array of VM BO list entries  */
+	struct ww_acquire_ctx ticket;	    /* Reservation ticket	    */
+	struct list_head list, duplicates;  /* BO lists			    */
+	struct amdgpu_sync *sync;	    /* Pointer to sync object	    */
+	bool reserved;			    /* Whether BOs are reserved	    */
+};
+
+enum bo_vm_match {
+	BO_VM_NOT_MAPPED = 0,	/* Match VMs where a BO is not mapped */
+	BO_VM_MAPPED,		/* Match VMs where a BO is mapped     */
+	BO_VM_ALL,		/* Match all VMs a BO was added to    */
+};
+
+/**
+ * reserve_bo_and_vm - reserve a BO and a VM unconditionally.
+ * @mem: KFD BO structure.
+ * @vm: the VM to reserve.
+ * @ctx: the struct that will be used in unreserve_bo_and_vms().
+ */
+static int reserve_bo_and_vm(struct kgd_mem *mem,
+			      struct amdgpu_vm *vm,
+			      struct bo_vm_reservation_context *ctx)
+{
+	struct amdgpu_bo *bo = mem->bo;
+	int ret;
+
+	WARN_ON(!vm);
+
+	ctx->reserved = false;
+	ctx->n_vms = 1;
+	ctx->sync = &mem->sync;
+
+	INIT_LIST_HEAD(&ctx->list);
+	INIT_LIST_HEAD(&ctx->duplicates);
+
+	ctx->vm_pd = kcalloc(ctx->n_vms, sizeof(*ctx->vm_pd), GFP_KERNEL);
+	if (!ctx->vm_pd)
+		return -ENOMEM;
+
+	ctx->kfd_bo.robj = bo;
+	ctx->kfd_bo.priority = 0;
+	ctx->kfd_bo.tv.bo = &bo->tbo;
+	ctx->kfd_bo.tv.shared = true;
+	ctx->kfd_bo.user_pages = NULL;
+	list_add(&ctx->kfd_bo.tv.head, &ctx->list);
+
+	amdgpu_vm_get_pd_bo(vm, &ctx->list, &ctx->vm_pd[0]);
+
+	ret = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->list,
+				     false, &ctx->duplicates);
+	if (!ret)
+		ctx->reserved = true;
+	else {
+		pr_err("Failed to reserve buffers in ttm\n");
+		kfree(ctx->vm_pd);
+		ctx->vm_pd = NULL;
+	}
+
+	return ret;
+}
+
+/**
+ * reserve_bo_and_cond_vms - reserve a BO and some VMs conditionally
+ * @mem: KFD BO structure.
+ * @vm: the VM to reserve. If NULL, then all VMs associated with the BO
+ * is used. Otherwise, a single VM associated with the BO.
+ * @map_type: the mapping status that will be used to filter the VMs.
+ * @ctx: the struct that will be used in unreserve_bo_and_vms().
+ *
+ * Returns 0 for success, negative for failure.
+ */
+static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
+				struct amdgpu_vm *vm, enum bo_vm_match map_type,
+				struct bo_vm_reservation_context *ctx)
+{
+	struct amdgpu_bo *bo = mem->bo;
+	struct kfd_bo_va_list *entry;
+	unsigned int i;
+	int ret;
+
+	ctx->reserved = false;
+	ctx->n_vms = 0;
+	ctx->vm_pd = NULL;
+	ctx->sync = &mem->sync;
+
+	INIT_LIST_HEAD(&ctx->list);
+	INIT_LIST_HEAD(&ctx->duplicates);
+
+	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
+		if ((vm && vm != entry->bo_va->base.vm) ||
+			(entry->is_mapped != map_type
+			&& map_type != BO_VM_ALL))
+			continue;
+
+		ctx->n_vms++;
+	}
+
+	if (ctx->n_vms != 0) {
+		ctx->vm_pd = kcalloc(ctx->n_vms, sizeof(*ctx->vm_pd),
+				     GFP_KERNEL);
+		if (!ctx->vm_pd)
+			return -ENOMEM;
+	}
+
+	ctx->kfd_bo.robj = bo;
+	ctx->kfd_bo.priority = 0;
+	ctx->kfd_bo.tv.bo = &bo->tbo;
+	ctx->kfd_bo.tv.shared = true;
+	ctx->kfd_bo.user_pages = NULL;
+	list_add(&ctx->kfd_bo.tv.head, &ctx->list);
+
+	i = 0;
+	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
+		if ((vm && vm != entry->bo_va->base.vm) ||
+			(entry->is_mapped != map_type
+			&& map_type != BO_VM_ALL))
+			continue;
+
+		amdgpu_vm_get_pd_bo(entry->bo_va->base.vm, &ctx->list,
+				&ctx->vm_pd[i]);
+		i++;
+	}
+
+	ret = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->list,
+				     false, &ctx->duplicates);
+	if (!ret)
+		ctx->reserved = true;
+	else
+		pr_err("Failed to reserve buffers in ttm.\n");
+
+	if (ret) {
+		kfree(ctx->vm_pd);
+		ctx->vm_pd = NULL;
+	}
+
+	return ret;
+}
+
+/**
+ * unreserve_bo_and_vms - Unreserve BO and VMs from a reservation context
+ * @ctx: Reservation context to unreserve
+ * @wait: Optionally wait for a sync object representing pending VM updates
+ * @intr: Whether the wait is interruptible
+ *
+ * Also frees any resources allocated in
+ * reserve_bo_and_(cond_)vm(s). Returns the status from
+ * amdgpu_sync_wait.
+ */
+static int unreserve_bo_and_vms(struct bo_vm_reservation_context *ctx,
+				 bool wait, bool intr)
+{
+	int ret = 0;
+
+	if (wait)
+		ret = amdgpu_sync_wait(ctx->sync, intr);
+
+	if (ctx->reserved)
+		ttm_eu_backoff_reservation(&ctx->ticket, &ctx->list);
+	kfree(ctx->vm_pd);
+
+	ctx->sync = NULL;
+
+	ctx->reserved = false;
+	ctx->vm_pd = NULL;
+
+	return ret;
+}
+
+static int unmap_bo_from_gpuvm(struct amdgpu_device *adev,
+				struct kfd_bo_va_list *entry,
+				struct amdgpu_sync *sync)
+{
+	struct amdgpu_bo_va *bo_va = entry->bo_va;
+	struct amdgpu_vm *vm = bo_va->base.vm;
+	struct amdkfd_vm *kvm = container_of(vm, struct amdkfd_vm, base);
+	struct amdgpu_bo *pd = vm->root.base.bo;
+
+	/* Remove eviction fence from PD (and thereby from PTs too as
+	 * they share the resv. object). Otherwise during PT update
+	 * job (see amdgpu_vm_bo_update_mapping), eviction fence would
+	 * get added to job->sync object and job execution would
+	 * trigger the eviction fence.
+	 */
+	amdgpu_amdkfd_remove_eviction_fence(pd,
+					    kvm->process_info->eviction_fence,
+					    NULL, NULL);
+	amdgpu_vm_bo_unmap(adev, bo_va, entry->va);
+
+	amdgpu_vm_clear_freed(adev, vm, &bo_va->last_pt_update);
+
+	/* Add the eviction fence back */
+	amdgpu_bo_fence(pd, &kvm->process_info->eviction_fence->base, true);
+
+	sync_vm_fence(adev, sync, bo_va->last_pt_update);
+
+	return 0;
+}
+
+static int update_gpuvm_pte(struct amdgpu_device *adev,
+		struct kfd_bo_va_list *entry,
+		struct amdgpu_sync *sync)
+{
+	int ret;
+	struct amdgpu_vm *vm;
+	struct amdgpu_bo_va *bo_va;
+	struct amdgpu_bo *bo;
+
+	bo_va = entry->bo_va;
+	vm = bo_va->base.vm;
+	bo = bo_va->base.bo;
+
+	/* Update the page tables  */
+	ret = amdgpu_vm_bo_update(adev, bo_va, false);
+	if (ret) {
+		pr_err("amdgpu_vm_bo_update failed\n");
+		return ret;
+	}
+
+	return sync_vm_fence(adev, sync, bo_va->last_pt_update);
+}
+
+static int map_bo_to_gpuvm(struct amdgpu_device *adev,
+		struct kfd_bo_va_list *entry, struct amdgpu_sync *sync)
+{
+	int ret;
+
+	/* Set virtual address for the allocation */
+	ret = amdgpu_vm_bo_map(adev, entry->bo_va, entry->va, 0,
+			       amdgpu_bo_size(entry->bo_va->base.bo),
+			       entry->pte_flags);
+	if (ret) {
+		pr_err("Failed to map VA 0x%llx in vm. ret %d\n",
+				entry->va, ret);
+		return ret;
+	}
+
+	ret = update_gpuvm_pte(adev, entry, sync);
+	if (ret) {
+		pr_err("update_gpuvm_pte() failed\n");
+		goto update_gpuvm_pte_failed;
+	}
+
+	return 0;
+
+update_gpuvm_pte_failed:
+	unmap_bo_from_gpuvm(adev, entry, sync);
+	return ret;
+}
+
+static int process_validate_vms(struct amdkfd_process_info *process_info)
+{
+	struct amdkfd_vm *peer_vm;
+	int ret;
+
+	list_for_each_entry(peer_vm, &process_info->vm_list_head,
+			    vm_list_node) {
+		ret = vm_validate_pt_pd_bos(peer_vm);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int process_update_pds(struct amdkfd_process_info *process_info,
+			      struct amdgpu_sync *sync)
+{
+	struct amdkfd_vm *peer_vm;
+	int ret;
+
+	list_for_each_entry(peer_vm, &process_info->vm_list_head,
+			    vm_list_node) {
+		ret = vm_update_pds(&peer_vm->base, sync);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+int amdgpu_amdkfd_gpuvm_create_process_vm(struct kgd_dev *kgd, void **vm,
+					  void **process_info,
+					  struct dma_fence **ef)
+{
+	int ret;
+	struct amdkfd_vm *new_vm;
+	struct amdkfd_process_info *info;
+	struct amdgpu_device *adev = get_amdgpu_device(kgd);
+
+	new_vm = kzalloc(sizeof(*new_vm), GFP_KERNEL);
+	if (!new_vm)
+		return -ENOMEM;
+
+	/* Initialize the VM context, allocate the page directory and zero it */
+	ret = amdgpu_vm_init(adev, &new_vm->base, AMDGPU_VM_CONTEXT_COMPUTE, 0);
+	if (ret) {
+		pr_err("Failed init vm ret %d\n", ret);
+		goto vm_init_fail;
+	}
+	new_vm->adev = adev;
+
+	if (!*process_info) {
+		info = kzalloc(sizeof(*info), GFP_KERNEL);
+		if (!info) {
+			ret = -ENOMEM;
+			goto alloc_process_info_fail;
+		}
+
+		mutex_init(&info->lock);
+		INIT_LIST_HEAD(&info->vm_list_head);
+		INIT_LIST_HEAD(&info->kfd_bo_list);
+
+		info->eviction_fence =
+			amdgpu_amdkfd_fence_create(dma_fence_context_alloc(1),
+						   current->mm);
+		if (!info->eviction_fence) {
+			pr_err("Failed to create eviction fence\n");
+			goto create_evict_fence_fail;
+		}
+
+		*process_info = info;
+		*ef = dma_fence_get(&info->eviction_fence->base);
+	}
+
+	new_vm->process_info = *process_info;
+
+	mutex_lock(&new_vm->process_info->lock);
+	list_add_tail(&new_vm->vm_list_node,
+			&(new_vm->process_info->vm_list_head));
+	new_vm->process_info->n_vms++;
+	mutex_unlock(&new_vm->process_info->lock);
+
+	*vm = (void *) new_vm;
+
+	pr_debug("Created process vm %p\n", *vm);
+
+	return ret;
+
+create_evict_fence_fail:
+	mutex_destroy(&info->lock);
+	kfree(info);
+alloc_process_info_fail:
+	amdgpu_vm_fini(adev, &new_vm->base);
+vm_init_fail:
+	kfree(new_vm);
+	return ret;
+
+}
+
+void amdgpu_amdkfd_gpuvm_destroy_process_vm(struct kgd_dev *kgd, void *vm)
+{
+	struct amdgpu_device *adev = get_amdgpu_device(kgd);
+	struct amdkfd_vm *kfd_vm = (struct amdkfd_vm *) vm;
+	struct amdgpu_vm *avm = &kfd_vm->base;
+	struct amdgpu_bo *pd;
+	struct amdkfd_process_info *process_info;
+
+	if (WARN_ON(!kgd || !vm))
+		return;
+
+	pr_debug("Destroying process vm %p\n", vm);
+	/* Release eviction fence from PD */
+	pd = avm->root.base.bo;
+	amdgpu_bo_reserve(pd, false);
+	amdgpu_bo_fence(pd, NULL, false);
+	amdgpu_bo_unreserve(pd);
+
+	process_info = kfd_vm->process_info;
+
+	mutex_lock(&process_info->lock);
+	process_info->n_vms--;
+	list_del(&kfd_vm->vm_list_node);
+	mutex_unlock(&process_info->lock);
+
+	/* Release per-process resources */
+	if (!process_info->n_vms) {
+		WARN_ON(!list_empty(&process_info->kfd_bo_list));
+
+		dma_fence_put(&process_info->eviction_fence->base);
+		mutex_destroy(&process_info->lock);
+		kfree(process_info);
+	}
+
+	/* Release the VM context */
+	amdgpu_vm_fini(adev, avm);
+	kfree(vm);
+}
+
+uint32_t amdgpu_amdkfd_gpuvm_get_process_page_dir(void *vm)
+{
+	struct amdkfd_vm *avm = (struct amdkfd_vm *)vm;
+
+	return avm->pd_phys_addr >> AMDGPU_GPU_PAGE_SHIFT;
+}
+
+int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
+		struct kgd_dev *kgd, uint64_t va, uint64_t size,
+		void *vm, struct kgd_mem **mem,
+		uint64_t *offset, uint32_t flags)
+{
+	struct amdgpu_device *adev = get_amdgpu_device(kgd);
+	struct amdkfd_vm *kfd_vm = (struct amdkfd_vm *)vm;
+	struct amdgpu_bo *bo;
+	int byte_align;
+	u32 alloc_domain;
+	u64 alloc_flags;
+	uint32_t mapping_flags;
+	int ret;
+
+	/*
+	 * Check on which domain to allocate BO
+	 */
+	if (flags & ALLOC_MEM_FLAGS_VRAM) {
+		alloc_domain = AMDGPU_GEM_DOMAIN_VRAM;
+		alloc_flags = AMDGPU_GEM_CREATE_VRAM_CLEARED;
+		alloc_flags |= (flags & ALLOC_MEM_FLAGS_PUBLIC) ?
+			AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED :
+			AMDGPU_GEM_CREATE_NO_CPU_ACCESS;
+	} else if (flags & ALLOC_MEM_FLAGS_GTT) {
+		alloc_domain = AMDGPU_GEM_DOMAIN_GTT;
+		alloc_flags = 0;
+	} else {
+		return -EINVAL;
+	}
+
+	*mem = kzalloc(sizeof(struct kgd_mem), GFP_KERNEL);
+	if (!*mem)
+		return -ENOMEM;
+	INIT_LIST_HEAD(&(*mem)->bo_va_list);
+	mutex_init(&(*mem)->lock);
+	(*mem)->aql_queue = !!(flags & ALLOC_MEM_FLAGS_AQL_QUEUE_MEM);
+
+	/* Workaround for AQL queue wraparound bug. Map the same
+	 * memory twice. That means we only actually allocate half
+	 * the memory.
+	 */
+	if ((*mem)->aql_queue)
+		size = size >> 1;
+
+	/* Workaround for TLB bug on older VI chips */
+	byte_align = (adev->family == AMDGPU_FAMILY_VI &&
+			adev->asic_type != CHIP_FIJI &&
+			adev->asic_type != CHIP_POLARIS10 &&
+			adev->asic_type != CHIP_POLARIS11) ?
+			VI_BO_SIZE_ALIGN : 1;
+
+	mapping_flags = AMDGPU_VM_PAGE_READABLE;
+	if (flags & ALLOC_MEM_FLAGS_WRITABLE)
+		mapping_flags |= AMDGPU_VM_PAGE_WRITEABLE;
+	if (flags & ALLOC_MEM_FLAGS_EXECUTABLE)
+		mapping_flags |= AMDGPU_VM_PAGE_EXECUTABLE;
+	if (flags & ALLOC_MEM_FLAGS_COHERENT)
+		mapping_flags |= AMDGPU_VM_MTYPE_UC;
+	else
+		mapping_flags |= AMDGPU_VM_MTYPE_NC;
+	(*mem)->mapping_flags = mapping_flags;
+
+	amdgpu_sync_create(&(*mem)->sync);
+
+	ret = amdgpu_amdkfd_reserve_system_mem_limit(adev, size, alloc_domain);
+	if (ret) {
+		pr_debug("Insufficient system memory\n");
+		goto err_reserve_system_mem;
+	}
+
+	pr_debug("\tcreate BO VA 0x%llx size 0x%llx domain %s\n",
+			va, size, domain_string(alloc_domain));
+
+	ret = amdgpu_bo_create(adev, size, byte_align, false,
+				alloc_domain, alloc_flags, NULL, NULL, &bo);
+	if (ret) {
+		pr_debug("Failed to create BO on domain %s. ret %d\n",
+				domain_string(alloc_domain), ret);
+		goto err_bo_create;
+	}
+	bo->kfd_bo = *mem;
+	(*mem)->bo = bo;
+
+	(*mem)->va = va;
+	(*mem)->domain = alloc_domain;
+	(*mem)->mapped_to_gpu_memory = 0;
+	(*mem)->process_info = kfd_vm->process_info;
+	add_kgd_mem_to_kfd_bo_list(*mem, kfd_vm->process_info);
+
+	if (offset)
+		*offset = amdgpu_bo_mmap_offset(bo);
+
+	return 0;
+
+err_bo_create:
+	unreserve_system_mem_limit(adev, size, alloc_domain);
+err_reserve_system_mem:
+	mutex_destroy(&(*mem)->lock);
+	kfree(*mem);
+	return ret;
+}
+
+int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
+		struct kgd_dev *kgd, struct kgd_mem *mem)
+{
+	struct amdkfd_process_info *process_info = mem->process_info;
+	unsigned long bo_size = mem->bo->tbo.mem.size;
+	struct kfd_bo_va_list *entry, *tmp;
+	struct bo_vm_reservation_context ctx;
+	struct ttm_validate_buffer *bo_list_entry;
+	int ret;
+
+	mutex_lock(&mem->lock);
+
+	if (mem->mapped_to_gpu_memory > 0) {
+		pr_debug("BO VA 0x%llx size 0x%lx is still mapped.\n",
+				mem->va, bo_size);
+		mutex_unlock(&mem->lock);
+		return -EBUSY;
+	}
+
+	mutex_unlock(&mem->lock);
+	/* lock is not needed after this, since mem is unused and will
+	 * be freed anyway
+	 */
+
+	/* Make sure restore workers don't access the BO any more */
+	bo_list_entry = &mem->validate_list;
+	mutex_lock(&process_info->lock);
+	list_del(&bo_list_entry->head);
+	mutex_unlock(&process_info->lock);
+
+	ret = reserve_bo_and_cond_vms(mem, NULL, BO_VM_ALL, &ctx);
+	if (unlikely(ret))
+		return ret;
+
+	/* The eviction fence should be removed by the last unmap.
+	 * TODO: Log an error condition if the bo still has the eviction fence
+	 * attached
+	 */
+	amdgpu_amdkfd_remove_eviction_fence(mem->bo,
+					process_info->eviction_fence,
+					NULL, NULL);
+	pr_debug("Release VA 0x%llx - 0x%llx\n", mem->va,
+		mem->va + bo_size * (1 + mem->aql_queue));
+
+	/* Remove from VM internal data structures */
+	list_for_each_entry_safe(entry, tmp, &mem->bo_va_list, bo_list)
+		remove_bo_from_vm((struct amdgpu_device *)entry->kgd_dev,
+				entry, bo_size);
+
+	ret = unreserve_bo_and_vms(&ctx, false, false);
+
+	/* Free the sync object */
+	amdgpu_sync_free(&mem->sync);
+
+	/* Free the BO*/
+	amdgpu_bo_unref(&mem->bo);
+	mutex_destroy(&mem->lock);
+	kfree(mem);
+
+	return ret;
+}
+
+int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
+		struct kgd_dev *kgd, struct kgd_mem *mem, void *vm)
+{
+	struct amdgpu_device *adev = get_amdgpu_device(kgd);
+	struct amdkfd_vm *kfd_vm = (struct amdkfd_vm *)vm;
+	int ret;
+	struct amdgpu_bo *bo;
+	uint32_t domain;
+	struct kfd_bo_va_list *entry;
+	struct bo_vm_reservation_context ctx;
+	struct kfd_bo_va_list *bo_va_entry = NULL;
+	struct kfd_bo_va_list *bo_va_entry_aql = NULL;
+	unsigned long bo_size;
+
+	/* Make sure restore is not running concurrently.
+	 */
+	mutex_lock(&mem->process_info->lock);
+
+	mutex_lock(&mem->lock);
+
+	bo = mem->bo;
+
+	if (!bo) {
+		pr_err("Invalid BO when mapping memory to GPU\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	domain = mem->domain;
+	bo_size = bo->tbo.mem.size;
+
+	pr_debug("Map VA 0x%llx - 0x%llx to vm %p domain %s\n",
+			mem->va,
+			mem->va + bo_size * (1 + mem->aql_queue),
+			vm, domain_string(domain));
+
+	ret = reserve_bo_and_vm(mem, vm, &ctx);
+	if (unlikely(ret))
+		goto out;
+
+	if (check_if_add_bo_to_vm((struct amdgpu_vm *)vm, mem)) {
+		ret = add_bo_to_vm(adev, mem, (struct amdgpu_vm *)vm, false,
+				&bo_va_entry);
+		if (ret)
+			goto add_bo_to_vm_failed;
+		if (mem->aql_queue) {
+			ret = add_bo_to_vm(adev, mem, (struct amdgpu_vm *)vm,
+					true, &bo_va_entry_aql);
+			if (ret)
+				goto add_bo_to_vm_failed_aql;
+		}
+	} else {
+		ret = vm_validate_pt_pd_bos((struct amdkfd_vm *)vm);
+		if (unlikely(ret))
+			goto add_bo_to_vm_failed;
+	}
+
+	if (mem->mapped_to_gpu_memory == 0) {
+		/* Validate BO only once. The eviction fence gets added to BO
+		 * the first time it is mapped. Validate will wait for all
+		 * background evictions to complete.
+		 */
+		ret = amdgpu_amdkfd_bo_validate(bo, domain, true);
+		if (ret) {
+			pr_debug("Validate failed\n");
+			goto map_bo_to_gpuvm_failed;
+		}
+	}
+
+	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
+		if (entry->bo_va->base.vm == vm && !entry->is_mapped) {
+			pr_debug("\t map VA 0x%llx - 0x%llx in entry %p\n",
+					entry->va, entry->va + bo_size,
+					entry);
+
+			ret = map_bo_to_gpuvm(adev, entry, ctx.sync);
+			if (ret) {
+				pr_err("Failed to map radeon bo to gpuvm\n");
+				goto map_bo_to_gpuvm_failed;
+			}
+
+			ret = vm_update_pds(vm, ctx.sync);
+			if (ret) {
+				pr_err("Failed to update page directories\n");
+				goto map_bo_to_gpuvm_failed;
+			}
+
+			entry->is_mapped = true;
+			mem->mapped_to_gpu_memory++;
+			pr_debug("\t INC mapping count %d\n",
+					mem->mapped_to_gpu_memory);
+		}
+	}
+
+	if (!amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) && !bo->pin_count)
+		amdgpu_bo_fence(bo,
+				&kfd_vm->process_info->eviction_fence->base,
+				true);
+	ret = unreserve_bo_and_vms(&ctx, false, false);
+
+	goto out;
+
+map_bo_to_gpuvm_failed:
+	if (bo_va_entry_aql)
+		remove_bo_from_vm(adev, bo_va_entry_aql, bo_size);
+add_bo_to_vm_failed_aql:
+	if (bo_va_entry)
+		remove_bo_from_vm(adev, bo_va_entry, bo_size);
+add_bo_to_vm_failed:
+	unreserve_bo_and_vms(&ctx, false, false);
+out:
+	mutex_unlock(&mem->process_info->lock);
+	mutex_unlock(&mem->lock);
+	return ret;
+}
+
+int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
+		struct kgd_dev *kgd, struct kgd_mem *mem, void *vm)
+{
+	struct amdgpu_device *adev = get_amdgpu_device(kgd);
+	struct amdkfd_process_info *process_info =
+		((struct amdkfd_vm *)vm)->process_info;
+	unsigned long bo_size = mem->bo->tbo.mem.size;
+	struct kfd_bo_va_list *entry;
+	struct bo_vm_reservation_context ctx;
+	int ret;
+
+	mutex_lock(&mem->lock);
+
+	ret = reserve_bo_and_cond_vms(mem, vm, BO_VM_MAPPED, &ctx);
+	if (unlikely(ret))
+		goto out;
+	/* If no VMs were reserved, it means the BO wasn't actually mapped */
+	if (ctx.n_vms == 0) {
+		ret = -EINVAL;
+		goto unreserve_out;
+	}
+
+	ret = vm_validate_pt_pd_bos((struct amdkfd_vm *)vm);
+	if (unlikely(ret))
+		goto unreserve_out;
+
+	pr_debug("Unmap VA 0x%llx - 0x%llx from vm %p\n",
+		mem->va,
+		mem->va + bo_size * (1 + mem->aql_queue),
+		vm);
+
+	list_for_each_entry(entry, &mem->bo_va_list, bo_list) {
+		if (entry->bo_va->base.vm == vm && entry->is_mapped) {
+			pr_debug("\t unmap VA 0x%llx - 0x%llx from entry %p\n",
+					entry->va,
+					entry->va + bo_size,
+					entry);
+
+			ret = unmap_bo_from_gpuvm(adev, entry, ctx.sync);
+			if (ret == 0) {
+				entry->is_mapped = false;
+			} else {
+				pr_err("failed to unmap VA 0x%llx\n",
+						mem->va);
+				goto unreserve_out;
+			}
+
+			mem->mapped_to_gpu_memory--;
+			pr_debug("\t DEC mapping count %d\n",
+					mem->mapped_to_gpu_memory);
+		}
+	}
+
+	/* If BO is unmapped from all VMs, unfence it. It can be evicted if
+	 * required.
+	 */
+	if (mem->mapped_to_gpu_memory == 0 &&
+	    !amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm) && !mem->bo->pin_count)
+		amdgpu_amdkfd_remove_eviction_fence(mem->bo,
+						process_info->eviction_fence,
+						    NULL, NULL);
+
+unreserve_out:
+	unreserve_bo_and_vms(&ctx, false, false);
+out:
+	mutex_unlock(&mem->lock);
+	return ret;
+}
+
+int amdgpu_amdkfd_gpuvm_sync_memory(
+		struct kgd_dev *kgd, struct kgd_mem *mem, bool intr)
+{
+	struct amdgpu_sync sync;
+	int ret;
+
+	amdgpu_sync_create(&sync);
+
+	mutex_lock(&mem->lock);
+	amdgpu_sync_clone(&mem->sync, &sync);
+	mutex_unlock(&mem->lock);
+
+	ret = amdgpu_sync_wait(&sync, intr);
+	amdgpu_sync_free(&sync);
+	return ret;
+}
+
+int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct kgd_dev *kgd,
+		struct kgd_mem *mem, void **kptr, uint64_t *size)
+{
+	int ret;
+	struct amdgpu_bo *bo = mem->bo;
+
+	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) {
+		pr_err("userptr can't be mapped to kernel\n");
+		return -EINVAL;
+	}
+
+	/* delete kgd_mem from kfd_bo_list to avoid re-validating
+	 * this BO in BO's restoring after eviction.
+	 */
+	mutex_lock(&mem->process_info->lock);
+
+	ret = amdgpu_bo_reserve(bo, true);
+	if (ret) {
+		pr_err("Failed to reserve bo. ret %d\n", ret);
+		goto bo_reserve_failed;
+	}
+
+	ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT, NULL);
+	if (ret) {
+		pr_err("Failed to pin bo. ret %d\n", ret);
+		goto pin_failed;
+	}
+
+	ret = amdgpu_bo_kmap(bo, kptr);
+	if (ret) {
+		pr_err("Failed to map bo to kernel. ret %d\n", ret);
+		goto kmap_failed;
+	}
+
+	amdgpu_amdkfd_remove_eviction_fence(
+		bo, mem->process_info->eviction_fence, NULL, NULL);
+	list_del_init(&mem->validate_list.head);
+
+	if (size)
+		*size = amdgpu_bo_size(bo);
+
+	amdgpu_bo_unreserve(bo);
+
+	mutex_unlock(&mem->process_info->lock);
+	return 0;
+
+kmap_failed:
+	amdgpu_bo_unpin(bo);
+pin_failed:
+	amdgpu_bo_unreserve(bo);
+bo_reserve_failed:
+	mutex_unlock(&mem->process_info->lock);
+
+	return ret;
+}
+
+/** amdgpu_amdkfd_gpuvm_restore_process_bos - Restore all BOs for the given
+ *   KFD process identified by process_info
+ *
+ * @process_info: amdkfd_process_info of the KFD process
+ *
+ * After memory eviction, restore thread calls this function. The function
+ * should be called when the Process is still valid. BO restore involves -
+ *
+ * 1.  Release old eviction fence and create new one
+ * 2.  Get two copies of PD BO list from all the VMs. Keep one copy as pd_list.
+ * 3   Use the second PD list and kfd_bo_list to create a list (ctx.list) of
+ *     BOs that need to be reserved.
+ * 4.  Reserve all the BOs
+ * 5.  Validate of PD and PT BOs.
+ * 6.  Validate all KFD BOs using kfd_bo_list and Map them and add new fence
+ * 7.  Add fence to all PD and PT BOs.
+ * 8.  Unreserve all BOs
+ */
+int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
+{
+	struct amdgpu_bo_list_entry *pd_bo_list;
+	struct amdkfd_process_info *process_info = info;
+	struct amdkfd_vm *peer_vm;
+	struct kgd_mem *mem;
+	struct bo_vm_reservation_context ctx;
+	struct amdgpu_amdkfd_fence *new_fence;
+	int ret = 0, i;
+	struct list_head duplicate_save;
+	struct amdgpu_sync sync_obj;
+
+	INIT_LIST_HEAD(&duplicate_save);
+	INIT_LIST_HEAD(&ctx.list);
+	INIT_LIST_HEAD(&ctx.duplicates);
+
+	pd_bo_list = kcalloc(process_info->n_vms,
+			     sizeof(struct amdgpu_bo_list_entry),
+			     GFP_KERNEL);
+	if (!pd_bo_list)
+		return -ENOMEM;
+
+	i = 0;
+	mutex_lock(&process_info->lock);
+	list_for_each_entry(peer_vm, &process_info->vm_list_head,
+			vm_list_node)
+		amdgpu_vm_get_pd_bo(&peer_vm->base, &ctx.list,
+				    &pd_bo_list[i++]);
+
+	/* Reserve all BOs and page tables/directory. Add all BOs from
+	 * kfd_bo_list to ctx.list
+	 */
+	list_for_each_entry(mem, &process_info->kfd_bo_list,
+			    validate_list.head) {
+
+		list_add_tail(&mem->resv_list.head, &ctx.list);
+		mem->resv_list.bo = mem->validate_list.bo;
+		mem->resv_list.shared = mem->validate_list.shared;
+	}
+
+	ret = ttm_eu_reserve_buffers(&ctx.ticket, &ctx.list,
+				     false, &duplicate_save);
+	if (ret) {
+		pr_debug("Memory eviction: TTM Reserve Failed. Try again\n");
+		goto ttm_reserve_fail;
+	}
+
+	amdgpu_sync_create(&sync_obj);
+
+	/* Validate PDs and PTs */
+	ret = process_validate_vms(process_info);
+	if (ret)
+		goto validate_map_fail;
+
+	/* Wait for PD/PTs validate to finish */
+	/* FIXME: I think this isn't needed */
+	list_for_each_entry(peer_vm, &process_info->vm_list_head,
+			    vm_list_node) {
+		struct amdgpu_bo *bo = peer_vm->base.root.base.bo;
+
+		ttm_bo_wait(&bo->tbo, false, false);
+	}
+
+	/* Validate BOs and map them to GPUVM (update VM page tables). */
+	list_for_each_entry(mem, &process_info->kfd_bo_list,
+			    validate_list.head) {
+
+		struct amdgpu_bo *bo = mem->bo;
+		uint32_t domain = mem->domain;
+		struct kfd_bo_va_list *bo_va_entry;
+
+		ret = amdgpu_amdkfd_bo_validate(bo, domain, false);
+		if (ret) {
+			pr_debug("Memory eviction: Validate BOs failed. Try again\n");
+			goto validate_map_fail;
+		}
+
+		list_for_each_entry(bo_va_entry, &mem->bo_va_list,
+				    bo_list) {
+			ret = update_gpuvm_pte((struct amdgpu_device *)
+					      bo_va_entry->kgd_dev,
+					      bo_va_entry,
+					      &sync_obj);
+			if (ret) {
+				pr_debug("Memory eviction: update PTE failed. Try again\n");
+				goto validate_map_fail;
+			}
+		}
+	}
+
+	/* Update page directories */
+	ret = process_update_pds(process_info, &sync_obj);
+	if (ret) {
+		pr_debug("Memory eviction: update PDs failed. Try again\n");
+		goto validate_map_fail;
+	}
+
+	amdgpu_sync_wait(&sync_obj, false);
+
+	/* Release old eviction fence and create new one, because fence only
+	 * goes from unsignaled to signaled, fence cannot be reused.
+	 * Use context and mm from the old fence.
+	 */
+	new_fence = amdgpu_amdkfd_fence_create(
+				process_info->eviction_fence->base.context,
+				process_info->eviction_fence->mm);
+	if (!new_fence) {
+		pr_err("Failed to create eviction fence\n");
+		ret = -ENOMEM;
+		goto validate_map_fail;
+	}
+	dma_fence_put(&process_info->eviction_fence->base);
+	process_info->eviction_fence = new_fence;
+	*ef = dma_fence_get(&new_fence->base);
+
+	/* Wait for validate to finish and attach new eviction fence */
+	list_for_each_entry(mem, &process_info->kfd_bo_list,
+		validate_list.head)
+		ttm_bo_wait(&mem->bo->tbo, false, false);
+	list_for_each_entry(mem, &process_info->kfd_bo_list,
+		validate_list.head)
+		amdgpu_bo_fence(mem->bo,
+			&process_info->eviction_fence->base, true);
+
+	/* Attach eviction fence to PD / PT BOs */
+	list_for_each_entry(peer_vm, &process_info->vm_list_head,
+			    vm_list_node) {
+		struct amdgpu_bo *bo = peer_vm->base.root.base.bo;
+
+		amdgpu_bo_fence(bo, &process_info->eviction_fence->base, true);
+	}
+
+validate_map_fail:
+	ttm_eu_backoff_reservation(&ctx.ticket, &ctx.list);
+	amdgpu_sync_free(&sync_obj);
+ttm_reserve_fail:
+	mutex_unlock(&process_info->lock);
+	kfree(pd_bo_list);
+	return ret;
+}