// SPDX-License-Identifier: MIT
/*
 * Copyright 2023 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 <drm/drm_auth.h>
#include <drm/drm_exec.h>
#include <linux/pm_runtime.h>

#include "amdgpu.h"
#include "amdgpu_vm.h"
#include "amdgpu_userq.h"
#include "amdgpu_userq_fence.h"

u32 amdgpu_userq_get_supported_ip_mask(struct amdgpu_device *adev)
{
	int i;
	u32 userq_ip_mask = 0;

	for (i = 0; i < AMDGPU_HW_IP_NUM; i++) {
		if (adev->userq_funcs[i])
			userq_ip_mask |= (1 << i);
	}

	return userq_ip_mask;
}

static int
amdgpu_userq_unmap_helper(struct amdgpu_userq_mgr *uq_mgr,
			  struct amdgpu_usermode_queue *queue)
{
	struct amdgpu_device *adev = uq_mgr->adev;
	const struct amdgpu_userq_funcs *userq_funcs =
		adev->userq_funcs[queue->queue_type];
	int r = 0;

	if (queue->state == AMDGPU_USERQ_STATE_MAPPED) {
		r = userq_funcs->unmap(uq_mgr, queue);
		if (r)
			queue->state = AMDGPU_USERQ_STATE_HUNG;
		else
			queue->state = AMDGPU_USERQ_STATE_UNMAPPED;
	}
	return r;
}

static int
amdgpu_userq_map_helper(struct amdgpu_userq_mgr *uq_mgr,
			struct amdgpu_usermode_queue *queue)
{
	struct amdgpu_device *adev = uq_mgr->adev;
	const struct amdgpu_userq_funcs *userq_funcs =
		adev->userq_funcs[queue->queue_type];
	int r = 0;

	if (queue->state == AMDGPU_USERQ_STATE_UNMAPPED) {
		r = userq_funcs->map(uq_mgr, queue);
		if (r) {
			queue->state = AMDGPU_USERQ_STATE_HUNG;
		} else {
			queue->state = AMDGPU_USERQ_STATE_MAPPED;
		}
	}
	return r;
}

static void
amdgpu_userq_wait_for_last_fence(struct amdgpu_userq_mgr *uq_mgr,
				 struct amdgpu_usermode_queue *queue)
{
	struct dma_fence *f = queue->last_fence;
	int ret;

	if (f && !dma_fence_is_signaled(f)) {
		ret = dma_fence_wait_timeout(f, true, msecs_to_jiffies(100));
		if (ret <= 0)
			drm_file_err(uq_mgr->file, "Timed out waiting for fence=%llu:%llu\n",
				     f->context, f->seqno);
	}
}

static void
amdgpu_userq_cleanup(struct amdgpu_userq_mgr *uq_mgr,
		     struct amdgpu_usermode_queue *queue,
		     int queue_id)
{
	struct amdgpu_device *adev = uq_mgr->adev;
	const struct amdgpu_userq_funcs *uq_funcs = adev->userq_funcs[queue->queue_type];

	uq_funcs->mqd_destroy(uq_mgr, queue);
	amdgpu_userq_fence_driver_free(queue);
	idr_remove(&uq_mgr->userq_idr, queue_id);
	kfree(queue);
}

int
amdgpu_userq_active(struct amdgpu_userq_mgr *uq_mgr)
{
	struct amdgpu_usermode_queue *queue;
	int queue_id;
	int ret = 0;

	mutex_lock(&uq_mgr->userq_mutex);
	/* Resume all the queues for this process */
	idr_for_each_entry(&uq_mgr->userq_idr, queue, queue_id)
		ret += queue->state == AMDGPU_USERQ_STATE_MAPPED;

	mutex_unlock(&uq_mgr->userq_mutex);
	return ret;
}

static struct amdgpu_usermode_queue *
amdgpu_userq_find(struct amdgpu_userq_mgr *uq_mgr, int qid)
{
	return idr_find(&uq_mgr->userq_idr, qid);
}

void
amdgpu_userq_ensure_ev_fence(struct amdgpu_userq_mgr *uq_mgr,
			     struct amdgpu_eviction_fence_mgr *evf_mgr)
{
	struct amdgpu_eviction_fence *ev_fence;

retry:
	/* Flush any pending resume work to create ev_fence */
	flush_delayed_work(&uq_mgr->resume_work);

	mutex_lock(&uq_mgr->userq_mutex);
	spin_lock(&evf_mgr->ev_fence_lock);
	ev_fence = evf_mgr->ev_fence;
	spin_unlock(&evf_mgr->ev_fence_lock);
	if (!ev_fence || dma_fence_is_signaled(&ev_fence->base)) {
		mutex_unlock(&uq_mgr->userq_mutex);
		/*
		 * Looks like there was no pending resume work,
		 * add one now to create a valid eviction fence
		 */
		schedule_delayed_work(&uq_mgr->resume_work, 0);
		goto retry;
	}
}

int amdgpu_userq_create_object(struct amdgpu_userq_mgr *uq_mgr,
			       struct amdgpu_userq_obj *userq_obj,
			       int size)
{
	struct amdgpu_device *adev = uq_mgr->adev;
	struct amdgpu_bo_param bp;
	int r;

	memset(&bp, 0, sizeof(bp));
	bp.byte_align = PAGE_SIZE;
	bp.domain = AMDGPU_GEM_DOMAIN_GTT;
	bp.flags = AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS |
		   AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
	bp.type = ttm_bo_type_kernel;
	bp.size = size;
	bp.resv = NULL;
	bp.bo_ptr_size = sizeof(struct amdgpu_bo);

	r = amdgpu_bo_create(adev, &bp, &userq_obj->obj);
	if (r) {
		drm_file_err(uq_mgr->file, "Failed to allocate BO for userqueue (%d)", r);
		return r;
	}

	r = amdgpu_bo_reserve(userq_obj->obj, true);
	if (r) {
		drm_file_err(uq_mgr->file, "Failed to reserve BO to map (%d)", r);
		goto free_obj;
	}

	r = amdgpu_ttm_alloc_gart(&(userq_obj->obj)->tbo);
	if (r) {
		drm_file_err(uq_mgr->file, "Failed to alloc GART for userqueue object (%d)", r);
		goto unresv;
	}

	r = amdgpu_bo_kmap(userq_obj->obj, &userq_obj->cpu_ptr);
	if (r) {
		drm_file_err(uq_mgr->file, "Failed to map BO for userqueue (%d)", r);
		goto unresv;
	}

	userq_obj->gpu_addr = amdgpu_bo_gpu_offset(userq_obj->obj);
	amdgpu_bo_unreserve(userq_obj->obj);
	memset(userq_obj->cpu_ptr, 0, size);
	return 0;

unresv:
	amdgpu_bo_unreserve(userq_obj->obj);

free_obj:
	amdgpu_bo_unref(&userq_obj->obj);
	return r;
}

void amdgpu_userq_destroy_object(struct amdgpu_userq_mgr *uq_mgr,
				 struct amdgpu_userq_obj *userq_obj)
{
	amdgpu_bo_kunmap(userq_obj->obj);
	amdgpu_bo_unref(&userq_obj->obj);
}

uint64_t
amdgpu_userq_get_doorbell_index(struct amdgpu_userq_mgr *uq_mgr,
				struct amdgpu_db_info *db_info,
				struct drm_file *filp)
{
	uint64_t index;
	struct drm_gem_object *gobj;
	struct amdgpu_userq_obj *db_obj = db_info->db_obj;
	int r, db_size;

	gobj = drm_gem_object_lookup(filp, db_info->doorbell_handle);
	if (gobj == NULL) {
		drm_file_err(uq_mgr->file, "Can't find GEM object for doorbell\n");
		return -EINVAL;
	}

	db_obj->obj = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
	drm_gem_object_put(gobj);

	r = amdgpu_bo_reserve(db_obj->obj, true);
	if (r) {
		drm_file_err(uq_mgr->file, "[Usermode queues] Failed to pin doorbell object\n");
		goto unref_bo;
	}

	/* Pin the BO before generating the index, unpin in queue destroy */
	r = amdgpu_bo_pin(db_obj->obj, AMDGPU_GEM_DOMAIN_DOORBELL);
	if (r) {
		drm_file_err(uq_mgr->file, "[Usermode queues] Failed to pin doorbell object\n");
		goto unresv_bo;
	}

	switch (db_info->queue_type) {
	case AMDGPU_HW_IP_GFX:
	case AMDGPU_HW_IP_COMPUTE:
	case AMDGPU_HW_IP_DMA:
		db_size = sizeof(u64);
		break;

	case AMDGPU_HW_IP_VCN_ENC:
		db_size = sizeof(u32);
		db_info->doorbell_offset += AMDGPU_NAVI10_DOORBELL64_VCN0_1 << 1;
		break;

	case AMDGPU_HW_IP_VPE:
		db_size = sizeof(u32);
		db_info->doorbell_offset += AMDGPU_NAVI10_DOORBELL64_VPE << 1;
		break;

	default:
		drm_file_err(uq_mgr->file, "[Usermode queues] IP %d not support\n",
			     db_info->queue_type);
		r = -EINVAL;
		goto unpin_bo;
	}

	index = amdgpu_doorbell_index_on_bar(uq_mgr->adev, db_obj->obj,
					     db_info->doorbell_offset, db_size);
	drm_dbg_driver(adev_to_drm(uq_mgr->adev),
		       "[Usermode queues] doorbell index=%lld\n", index);
	amdgpu_bo_unreserve(db_obj->obj);
	return index;

unpin_bo:
	amdgpu_bo_unpin(db_obj->obj);
unresv_bo:
	amdgpu_bo_unreserve(db_obj->obj);
unref_bo:
	amdgpu_bo_unref(&db_obj->obj);
	return r;
}

static int
amdgpu_userq_destroy(struct drm_file *filp, int queue_id)
{
	struct amdgpu_fpriv *fpriv = filp->driver_priv;
	struct amdgpu_userq_mgr *uq_mgr = &fpriv->userq_mgr;
	struct amdgpu_device *adev = uq_mgr->adev;
	struct amdgpu_usermode_queue *queue;
	int r = 0;

	cancel_delayed_work_sync(&uq_mgr->resume_work);
	mutex_lock(&uq_mgr->userq_mutex);

	queue = amdgpu_userq_find(uq_mgr, queue_id);
	if (!queue) {
		drm_dbg_driver(adev_to_drm(uq_mgr->adev), "Invalid queue id to destroy\n");
		mutex_unlock(&uq_mgr->userq_mutex);
		return -EINVAL;
	}
	amdgpu_userq_wait_for_last_fence(uq_mgr, queue);
	r = amdgpu_bo_reserve(queue->db_obj.obj, true);
	if (!r) {
		amdgpu_bo_unpin(queue->db_obj.obj);
		amdgpu_bo_unreserve(queue->db_obj.obj);
	}
	amdgpu_bo_unref(&queue->db_obj.obj);
	r = amdgpu_userq_unmap_helper(uq_mgr, queue);
	amdgpu_userq_cleanup(uq_mgr, queue, queue_id);
	mutex_unlock(&uq_mgr->userq_mutex);

	pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
	pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);

	return r;
}

static int amdgpu_userq_priority_permit(struct drm_file *filp,
					int priority)
{
	if (priority < AMDGPU_USERQ_CREATE_FLAGS_QUEUE_PRIORITY_HIGH)
		return 0;

	if (capable(CAP_SYS_NICE))
		return 0;

	if (drm_is_current_master(filp))
		return 0;

	return -EACCES;
}

static int
amdgpu_userq_create(struct drm_file *filp, union drm_amdgpu_userq *args)
{
	struct amdgpu_fpriv *fpriv = filp->driver_priv;
	struct amdgpu_userq_mgr *uq_mgr = &fpriv->userq_mgr;
	struct amdgpu_device *adev = uq_mgr->adev;
	const struct amdgpu_userq_funcs *uq_funcs;
	struct amdgpu_usermode_queue *queue;
	struct amdgpu_db_info db_info;
	bool skip_map_queue;
	uint64_t index;
	int qid, r = 0;
	int priority =
		(args->in.flags & AMDGPU_USERQ_CREATE_FLAGS_QUEUE_PRIORITY_MASK) >>
		AMDGPU_USERQ_CREATE_FLAGS_QUEUE_PRIORITY_SHIFT;

	/* Usermode queues are only supported for GFX IP as of now */
	if (args->in.ip_type != AMDGPU_HW_IP_GFX &&
	    args->in.ip_type != AMDGPU_HW_IP_DMA &&
	    args->in.ip_type != AMDGPU_HW_IP_COMPUTE) {
		drm_file_err(uq_mgr->file, "Usermode queue doesn't support IP type %u\n",
			     args->in.ip_type);
		return -EINVAL;
	}

	r = amdgpu_userq_priority_permit(filp, priority);
	if (r)
		return r;

	if ((args->in.flags & AMDGPU_USERQ_CREATE_FLAGS_QUEUE_SECURE) &&
	    (args->in.ip_type != AMDGPU_HW_IP_GFX) &&
	    (args->in.ip_type != AMDGPU_HW_IP_COMPUTE) &&
	    !amdgpu_is_tmz(adev)) {
		drm_file_err(uq_mgr->file, "Secure only supported on GFX/Compute queues\n");
		return -EINVAL;
	}

	r = pm_runtime_get_sync(adev_to_drm(adev)->dev);
	if (r < 0) {
		drm_file_err(uq_mgr->file, "pm_runtime_get_sync() failed for userqueue create\n");
		pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
		return r;
	}

	/*
	 * There could be a situation that we are creating a new queue while
	 * the other queues under this UQ_mgr are suspended. So if there is any
	 * resume work pending, wait for it to get done.
	 *
	 * This will also make sure we have a valid eviction fence ready to be used.
	 */
	mutex_lock(&adev->userq_mutex);
	amdgpu_userq_ensure_ev_fence(&fpriv->userq_mgr, &fpriv->evf_mgr);

	uq_funcs = adev->userq_funcs[args->in.ip_type];
	if (!uq_funcs) {
		drm_file_err(uq_mgr->file, "Usermode queue is not supported for this IP (%u)\n",
			     args->in.ip_type);
		r = -EINVAL;
		goto unlock;
	}

	queue = kzalloc(sizeof(struct amdgpu_usermode_queue), GFP_KERNEL);
	if (!queue) {
		drm_file_err(uq_mgr->file, "Failed to allocate memory for queue\n");
		r = -ENOMEM;
		goto unlock;
	}
	queue->doorbell_handle = args->in.doorbell_handle;
	queue->queue_type = args->in.ip_type;
	queue->vm = &fpriv->vm;
	queue->priority = priority;

	db_info.queue_type = queue->queue_type;
	db_info.doorbell_handle = queue->doorbell_handle;
	db_info.db_obj = &queue->db_obj;
	db_info.doorbell_offset = args->in.doorbell_offset;

	/* Convert relative doorbell offset into absolute doorbell index */
	index = amdgpu_userq_get_doorbell_index(uq_mgr, &db_info, filp);
	if (index == (uint64_t)-EINVAL) {
		drm_file_err(uq_mgr->file, "Failed to get doorbell for queue\n");
		kfree(queue);
		goto unlock;
	}

	queue->doorbell_index = index;
	xa_init_flags(&queue->fence_drv_xa, XA_FLAGS_ALLOC);
	r = amdgpu_userq_fence_driver_alloc(adev, queue);
	if (r) {
		drm_file_err(uq_mgr->file, "Failed to alloc fence driver\n");
		goto unlock;
	}

	r = uq_funcs->mqd_create(uq_mgr, &args->in, queue);
	if (r) {
		drm_file_err(uq_mgr->file, "Failed to create Queue\n");
		amdgpu_userq_fence_driver_free(queue);
		kfree(queue);
		goto unlock;
	}


	qid = idr_alloc(&uq_mgr->userq_idr, queue, 1, AMDGPU_MAX_USERQ_COUNT, GFP_KERNEL);
	if (qid < 0) {
		drm_file_err(uq_mgr->file, "Failed to allocate a queue id\n");
		amdgpu_userq_fence_driver_free(queue);
		uq_funcs->mqd_destroy(uq_mgr, queue);
		kfree(queue);
		r = -ENOMEM;
		goto unlock;
	}

	/* don't map the queue if scheduling is halted */
	if (adev->userq_halt_for_enforce_isolation &&
	    ((queue->queue_type == AMDGPU_HW_IP_GFX) ||
	     (queue->queue_type == AMDGPU_HW_IP_COMPUTE)))
		skip_map_queue = true;
	else
		skip_map_queue = false;
	if (!skip_map_queue) {
		r = amdgpu_userq_map_helper(uq_mgr, queue);
		if (r) {
			drm_file_err(uq_mgr->file, "Failed to map Queue\n");
			idr_remove(&uq_mgr->userq_idr, qid);
			amdgpu_userq_fence_driver_free(queue);
			uq_funcs->mqd_destroy(uq_mgr, queue);
			kfree(queue);
			goto unlock;
		}
	}


	args->out.queue_id = qid;

unlock:
	mutex_unlock(&uq_mgr->userq_mutex);
	mutex_unlock(&adev->userq_mutex);

	return r;
}

int amdgpu_userq_ioctl(struct drm_device *dev, void *data,
		       struct drm_file *filp)
{
	union drm_amdgpu_userq *args = data;
	int r;

	switch (args->in.op) {
	case AMDGPU_USERQ_OP_CREATE:
		if (args->in.flags & ~(AMDGPU_USERQ_CREATE_FLAGS_QUEUE_PRIORITY_MASK |
				       AMDGPU_USERQ_CREATE_FLAGS_QUEUE_SECURE))
			return -EINVAL;
		r = amdgpu_userq_create(filp, args);
		if (r)
			drm_file_err(filp, "Failed to create usermode queue\n");
		break;

	case AMDGPU_USERQ_OP_FREE:
		if (args->in.ip_type ||
		    args->in.doorbell_handle ||
		    args->in.doorbell_offset ||
		    args->in.flags ||
		    args->in.queue_va ||
		    args->in.queue_size ||
		    args->in.rptr_va ||
		    args->in.wptr_va ||
		    args->in.wptr_va ||
		    args->in.mqd ||
		    args->in.mqd_size)
			return -EINVAL;
		r = amdgpu_userq_destroy(filp, args->in.queue_id);
		if (r)
			drm_file_err(filp, "Failed to destroy usermode queue\n");
		break;

	default:
		drm_dbg_driver(dev, "Invalid user queue op specified: %d\n", args->in.op);
		return -EINVAL;
	}

	return r;
}

static int
amdgpu_userq_restore_all(struct amdgpu_userq_mgr *uq_mgr)
{
	struct amdgpu_usermode_queue *queue;
	int queue_id;
	int ret = 0, r;

	/* Resume all the queues for this process */
	idr_for_each_entry(&uq_mgr->userq_idr, queue, queue_id) {
		r = amdgpu_userq_map_helper(uq_mgr, queue);
		if (r)
			ret = r;
	}

	if (ret)
		drm_file_err(uq_mgr->file, "Failed to map all the queues\n");
	return ret;
}

static int
amdgpu_userq_validate_vm_bo(void *_unused, struct amdgpu_bo *bo)
{
	struct ttm_operation_ctx ctx = { false, false };
	int ret;

	amdgpu_bo_placement_from_domain(bo, bo->allowed_domains);

	ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
	if (ret)
		DRM_ERROR("Fail to validate\n");

	return ret;
}

static int
amdgpu_userq_validate_bos(struct amdgpu_userq_mgr *uq_mgr)
{
	struct amdgpu_fpriv *fpriv = uq_mgr_to_fpriv(uq_mgr);
	struct amdgpu_vm *vm = &fpriv->vm;
	struct amdgpu_device *adev = uq_mgr->adev;
	struct amdgpu_bo_va *bo_va;
	struct ww_acquire_ctx *ticket;
	struct drm_exec exec;
	struct amdgpu_bo *bo;
	struct dma_resv *resv;
	bool clear, unlock;
	int ret = 0;

	drm_exec_init(&exec, DRM_EXEC_IGNORE_DUPLICATES, 0);
	drm_exec_until_all_locked(&exec) {
		ret = amdgpu_vm_lock_pd(vm, &exec, 2);
		drm_exec_retry_on_contention(&exec);
		if (unlikely(ret)) {
			drm_file_err(uq_mgr->file, "Failed to lock PD\n");
			goto unlock_all;
		}

		/* Lock the done list */
		list_for_each_entry(bo_va, &vm->done, base.vm_status) {
			bo = bo_va->base.bo;
			if (!bo)
				continue;

			ret = drm_exec_lock_obj(&exec, &bo->tbo.base);
			drm_exec_retry_on_contention(&exec);
			if (unlikely(ret))
				goto unlock_all;
		}
	}

	spin_lock(&vm->status_lock);
	while (!list_empty(&vm->moved)) {
		bo_va = list_first_entry(&vm->moved, struct amdgpu_bo_va,
					 base.vm_status);
		spin_unlock(&vm->status_lock);

		/* Per VM BOs never need to bo cleared in the page tables */
		ret = amdgpu_vm_bo_update(adev, bo_va, false);
		if (ret)
			goto unlock_all;
		spin_lock(&vm->status_lock);
	}

	ticket = &exec.ticket;
	while (!list_empty(&vm->invalidated)) {
		bo_va = list_first_entry(&vm->invalidated, struct amdgpu_bo_va,
					 base.vm_status);
		resv = bo_va->base.bo->tbo.base.resv;
		spin_unlock(&vm->status_lock);

		bo = bo_va->base.bo;
		ret = amdgpu_userq_validate_vm_bo(NULL, bo);
		if (ret) {
			drm_file_err(uq_mgr->file, "Failed to validate BO\n");
			goto unlock_all;
		}

		/* Try to reserve the BO to avoid clearing its ptes */
		if (!adev->debug_vm && dma_resv_trylock(resv)) {
			clear = false;
			unlock = true;
		/* The caller is already holding the reservation lock */
		} else if (dma_resv_locking_ctx(resv) == ticket) {
			clear = false;
			unlock = false;
		/* Somebody else is using the BO right now */
		} else {
			clear = true;
			unlock = false;
		}

		ret = amdgpu_vm_bo_update(adev, bo_va, clear);

		if (unlock)
			dma_resv_unlock(resv);
		if (ret)
			goto unlock_all;

		spin_lock(&vm->status_lock);
	}
	spin_unlock(&vm->status_lock);

	ret = amdgpu_eviction_fence_replace_fence(&fpriv->evf_mgr, &exec);
	if (ret)
		drm_file_err(uq_mgr->file, "Failed to replace eviction fence\n");

unlock_all:
	drm_exec_fini(&exec);
	return ret;
}

static void amdgpu_userq_restore_worker(struct work_struct *work)
{
	struct amdgpu_userq_mgr *uq_mgr = work_to_uq_mgr(work, resume_work.work);
	struct amdgpu_fpriv *fpriv = uq_mgr_to_fpriv(uq_mgr);
	int ret;

	flush_work(&fpriv->evf_mgr.suspend_work.work);

	mutex_lock(&uq_mgr->userq_mutex);

	ret = amdgpu_userq_validate_bos(uq_mgr);
	if (ret) {
		drm_file_err(uq_mgr->file, "Failed to validate BOs to restore\n");
		goto unlock;
	}

	ret = amdgpu_userq_restore_all(uq_mgr);
	if (ret) {
		drm_file_err(uq_mgr->file, "Failed to restore all queues\n");
		goto unlock;
	}

unlock:
	mutex_unlock(&uq_mgr->userq_mutex);
}

static int
amdgpu_userq_evict_all(struct amdgpu_userq_mgr *uq_mgr)
{
	struct amdgpu_usermode_queue *queue;
	int queue_id;
	int ret = 0, r;

	/* Try to unmap all the queues in this process ctx */
	idr_for_each_entry(&uq_mgr->userq_idr, queue, queue_id) {
		r = amdgpu_userq_unmap_helper(uq_mgr, queue);
		if (r)
			ret = r;
	}

	if (ret)
		drm_file_err(uq_mgr->file, "Couldn't unmap all the queues\n");
	return ret;
}

static int
amdgpu_userq_wait_for_signal(struct amdgpu_userq_mgr *uq_mgr)
{
	struct amdgpu_usermode_queue *queue;
	int queue_id, ret;

	idr_for_each_entry(&uq_mgr->userq_idr, queue, queue_id) {
		struct dma_fence *f = queue->last_fence;

		if (!f || dma_fence_is_signaled(f))
			continue;
		ret = dma_fence_wait_timeout(f, true, msecs_to_jiffies(100));
		if (ret <= 0) {
			drm_file_err(uq_mgr->file, "Timed out waiting for fence=%llu:%llu\n",
				     f->context, f->seqno);
			return -ETIMEDOUT;
		}
	}

	return 0;
}

void
amdgpu_userq_evict(struct amdgpu_userq_mgr *uq_mgr,
		   struct amdgpu_eviction_fence *ev_fence)
{
	int ret;
	struct amdgpu_fpriv *fpriv = uq_mgr_to_fpriv(uq_mgr);
	struct amdgpu_eviction_fence_mgr *evf_mgr = &fpriv->evf_mgr;

	/* Wait for any pending userqueue fence work to finish */
	ret = amdgpu_userq_wait_for_signal(uq_mgr);
	if (ret) {
		drm_file_err(uq_mgr->file, "Not evicting userqueue, timeout waiting for work\n");
		return;
	}

	ret = amdgpu_userq_evict_all(uq_mgr);
	if (ret) {
		drm_file_err(uq_mgr->file, "Failed to evict userqueue\n");
		return;
	}

	/* Signal current eviction fence */
	amdgpu_eviction_fence_signal(evf_mgr, ev_fence);

	if (evf_mgr->fd_closing) {
		cancel_delayed_work_sync(&uq_mgr->resume_work);
		return;
	}

	/* Schedule a resume work */
	schedule_delayed_work(&uq_mgr->resume_work, 0);
}

int amdgpu_userq_mgr_init(struct amdgpu_userq_mgr *userq_mgr, struct drm_file *file_priv,
			  struct amdgpu_device *adev)
{
	mutex_init(&userq_mgr->userq_mutex);
	idr_init_base(&userq_mgr->userq_idr, 1);
	userq_mgr->adev = adev;
	userq_mgr->file = file_priv;

	mutex_lock(&adev->userq_mutex);
	list_add(&userq_mgr->list, &adev->userq_mgr_list);
	mutex_unlock(&adev->userq_mutex);

	INIT_DELAYED_WORK(&userq_mgr->resume_work, amdgpu_userq_restore_worker);
	return 0;
}

void amdgpu_userq_mgr_fini(struct amdgpu_userq_mgr *userq_mgr)
{
	struct amdgpu_device *adev = userq_mgr->adev;
	struct amdgpu_usermode_queue *queue;
	struct amdgpu_userq_mgr *uqm, *tmp;
	uint32_t queue_id;

	cancel_delayed_work_sync(&userq_mgr->resume_work);

	mutex_lock(&adev->userq_mutex);
	mutex_lock(&userq_mgr->userq_mutex);
	idr_for_each_entry(&userq_mgr->userq_idr, queue, queue_id) {
		amdgpu_userq_wait_for_last_fence(userq_mgr, queue);
		amdgpu_userq_unmap_helper(userq_mgr, queue);
		amdgpu_userq_cleanup(userq_mgr, queue, queue_id);
	}

	list_for_each_entry_safe(uqm, tmp, &adev->userq_mgr_list, list) {
		if (uqm == userq_mgr) {
			list_del(&uqm->list);
			break;
		}
	}
	idr_destroy(&userq_mgr->userq_idr);
	mutex_unlock(&userq_mgr->userq_mutex);
	mutex_unlock(&adev->userq_mutex);
	mutex_destroy(&userq_mgr->userq_mutex);
}

int amdgpu_userq_suspend(struct amdgpu_device *adev)
{
	u32 ip_mask = amdgpu_userq_get_supported_ip_mask(adev);
	struct amdgpu_usermode_queue *queue;
	struct amdgpu_userq_mgr *uqm, *tmp;
	int queue_id;
	int ret = 0, r;

	if (!ip_mask)
		return 0;

	mutex_lock(&adev->userq_mutex);
	list_for_each_entry_safe(uqm, tmp, &adev->userq_mgr_list, list) {
		cancel_delayed_work_sync(&uqm->resume_work);
		mutex_lock(&uqm->userq_mutex);
		idr_for_each_entry(&uqm->userq_idr, queue, queue_id) {
			r = amdgpu_userq_unmap_helper(uqm, queue);
			if (r)
				ret = r;
		}
		mutex_unlock(&uqm->userq_mutex);
	}
	mutex_unlock(&adev->userq_mutex);
	return ret;
}

int amdgpu_userq_resume(struct amdgpu_device *adev)
{
	u32 ip_mask = amdgpu_userq_get_supported_ip_mask(adev);
	struct amdgpu_usermode_queue *queue;
	struct amdgpu_userq_mgr *uqm, *tmp;
	int queue_id;
	int ret = 0, r;

	if (!ip_mask)
		return 0;

	mutex_lock(&adev->userq_mutex);
	list_for_each_entry_safe(uqm, tmp, &adev->userq_mgr_list, list) {
		mutex_lock(&uqm->userq_mutex);
		idr_for_each_entry(&uqm->userq_idr, queue, queue_id) {
			r = amdgpu_userq_map_helper(uqm, queue);
			if (r)
				ret = r;
		}
		mutex_unlock(&uqm->userq_mutex);
	}
	mutex_unlock(&adev->userq_mutex);
	return ret;
}

int amdgpu_userq_stop_sched_for_enforce_isolation(struct amdgpu_device *adev,
						  u32 idx)
{
	u32 ip_mask = amdgpu_userq_get_supported_ip_mask(adev);
	struct amdgpu_usermode_queue *queue;
	struct amdgpu_userq_mgr *uqm, *tmp;
	int queue_id;
	int ret = 0, r;

	/* only need to stop gfx/compute */
	if (!(ip_mask & ((1 << AMDGPU_HW_IP_GFX) | (1 << AMDGPU_HW_IP_COMPUTE))))
		return 0;

	mutex_lock(&adev->userq_mutex);
	if (adev->userq_halt_for_enforce_isolation)
		dev_warn(adev->dev, "userq scheduling already stopped!\n");
	adev->userq_halt_for_enforce_isolation = true;
	list_for_each_entry_safe(uqm, tmp, &adev->userq_mgr_list, list) {
		cancel_delayed_work_sync(&uqm->resume_work);
		mutex_lock(&uqm->userq_mutex);
		idr_for_each_entry(&uqm->userq_idr, queue, queue_id) {
			if (((queue->queue_type == AMDGPU_HW_IP_GFX) ||
			     (queue->queue_type == AMDGPU_HW_IP_COMPUTE)) &&
			    (queue->xcp_id == idx)) {
				r = amdgpu_userq_unmap_helper(uqm, queue);
				if (r)
					ret = r;
			}
		}
		mutex_unlock(&uqm->userq_mutex);
	}
	mutex_unlock(&adev->userq_mutex);
	return ret;
}

int amdgpu_userq_start_sched_for_enforce_isolation(struct amdgpu_device *adev,
						   u32 idx)
{
	u32 ip_mask = amdgpu_userq_get_supported_ip_mask(adev);
	struct amdgpu_usermode_queue *queue;
	struct amdgpu_userq_mgr *uqm, *tmp;
	int queue_id;
	int ret = 0, r;

	/* only need to stop gfx/compute */
	if (!(ip_mask & ((1 << AMDGPU_HW_IP_GFX) | (1 << AMDGPU_HW_IP_COMPUTE))))
		return 0;

	mutex_lock(&adev->userq_mutex);
	if (!adev->userq_halt_for_enforce_isolation)
		dev_warn(adev->dev, "userq scheduling already started!\n");
	adev->userq_halt_for_enforce_isolation = false;
	list_for_each_entry_safe(uqm, tmp, &adev->userq_mgr_list, list) {
		mutex_lock(&uqm->userq_mutex);
		idr_for_each_entry(&uqm->userq_idr, queue, queue_id) {
			if (((queue->queue_type == AMDGPU_HW_IP_GFX) ||
			     (queue->queue_type == AMDGPU_HW_IP_COMPUTE)) &&
			    (queue->xcp_id == idx)) {
				r = amdgpu_userq_map_helper(uqm, queue);
				if (r)
					ret = r;
			}
		}
		mutex_unlock(&uqm->userq_mutex);
	}
	mutex_unlock(&adev->userq_mutex);
	return ret;
}