/*
 * 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/ratelimit.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/sched.h>
#include "kfd_priv.h"
#include "kfd_device_queue_manager.h"
#include "kfd_mqd_manager.h"
#include "cik_regs.h"
#include "kfd_kernel_queue.h"
#include "amdgpu_amdkfd.h"

/* Size of the per-pipe EOP queue */
#define CIK_HPD_EOP_BYTES_LOG2 11
#define CIK_HPD_EOP_BYTES (1U << CIK_HPD_EOP_BYTES_LOG2)

static int set_pasid_vmid_mapping(struct device_queue_manager *dqm,
                                        unsigned int pasid, unsigned int vmid);

static int execute_queues_cpsch(struct device_queue_manager *dqm,
                                enum kfd_unmap_queues_filter filter,
                                uint32_t filter_param);
static int unmap_queues_cpsch(struct device_queue_manager *dqm,
                                enum kfd_unmap_queues_filter filter,
                                uint32_t filter_param);

static int map_queues_cpsch(struct device_queue_manager *dqm);

static void deallocate_sdma_queue(struct device_queue_manager *dqm,
                                struct queue *q);

static inline void deallocate_hqd(struct device_queue_manager *dqm,
                                struct queue *q);
static int allocate_hqd(struct device_queue_manager *dqm, struct queue *q);
static int allocate_sdma_queue(struct device_queue_manager *dqm,
                                struct queue *q);
static void kfd_process_hw_exception(struct work_struct *work);

static inline
enum KFD_MQD_TYPE get_mqd_type_from_queue_type(enum kfd_queue_type type)
{
        if (type == KFD_QUEUE_TYPE_SDMA || type == KFD_QUEUE_TYPE_SDMA_XGMI)
                return KFD_MQD_TYPE_SDMA;
        return KFD_MQD_TYPE_CP;
}

static bool is_pipe_enabled(struct device_queue_manager *dqm, int mec, int pipe)
{
        int i;
        int pipe_offset = mec * dqm->dev->shared_resources.num_pipe_per_mec
                + pipe * dqm->dev->shared_resources.num_queue_per_pipe;

        /* queue is available for KFD usage if bit is 1 */
        for (i = 0; i <  dqm->dev->shared_resources.num_queue_per_pipe; ++i)
                if (test_bit(pipe_offset + i,
                              dqm->dev->shared_resources.queue_bitmap))
                        return true;
        return false;
}

unsigned int get_queues_num(struct device_queue_manager *dqm)
{
        return bitmap_weight(dqm->dev->shared_resources.queue_bitmap,
                                KGD_MAX_QUEUES);
}

unsigned int get_queues_per_pipe(struct device_queue_manager *dqm)
{
        return dqm->dev->shared_resources.num_queue_per_pipe;
}

unsigned int get_pipes_per_mec(struct device_queue_manager *dqm)
{
        return dqm->dev->shared_resources.num_pipe_per_mec;
}

static unsigned int get_num_sdma_engines(struct device_queue_manager *dqm)
{
        return dqm->dev->device_info->num_sdma_engines;
}

static unsigned int get_num_xgmi_sdma_engines(struct device_queue_manager *dqm)
{
        return dqm->dev->device_info->num_xgmi_sdma_engines;
}

unsigned int get_num_sdma_queues(struct device_queue_manager *dqm)
{
        return dqm->dev->device_info->num_sdma_engines
                        * dqm->dev->device_info->num_sdma_queues_per_engine;
}

unsigned int get_num_xgmi_sdma_queues(struct device_queue_manager *dqm)
{
        return dqm->dev->device_info->num_xgmi_sdma_engines
                        * dqm->dev->device_info->num_sdma_queues_per_engine;
}

void program_sh_mem_settings(struct device_queue_manager *dqm,
                                        struct qcm_process_device *qpd)
{
        return dqm->dev->kfd2kgd->program_sh_mem_settings(
                                                dqm->dev->kgd, qpd->vmid,
                                                qpd->sh_mem_config,
                                                qpd->sh_mem_ape1_base,
                                                qpd->sh_mem_ape1_limit,
                                                qpd->sh_mem_bases);
}

static int allocate_doorbell(struct qcm_process_device *qpd, struct queue *q)
{
        struct kfd_dev *dev = qpd->dqm->dev;

        if (!KFD_IS_SOC15(dev->device_info->asic_family)) {
                /* On pre-SOC15 chips we need to use the queue ID to
                 * preserve the user mode ABI.
                 */
                q->doorbell_id = q->properties.queue_id;
        } else if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
                        q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                /* For SDMA queues on SOC15 with 8-byte doorbell, use static
                 * doorbell assignments based on the engine and queue id.
                 * The doobell index distance between RLC (2*i) and (2*i+1)
                 * for a SDMA engine is 512.
                 */
                uint32_t *idx_offset =
                                dev->shared_resources.sdma_doorbell_idx;

                q->doorbell_id = idx_offset[q->properties.sdma_engine_id]
                        + (q->properties.sdma_queue_id & 1)
                        * KFD_QUEUE_DOORBELL_MIRROR_OFFSET
                        + (q->properties.sdma_queue_id >> 1);
        } else {
                /* For CP queues on SOC15 reserve a free doorbell ID */
                unsigned int found;

                found = find_first_zero_bit(qpd->doorbell_bitmap,
                                            KFD_MAX_NUM_OF_QUEUES_PER_PROCESS);
                if (found >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) {
                        pr_debug("No doorbells available");
                        return -EBUSY;
                }
                set_bit(found, qpd->doorbell_bitmap);
                q->doorbell_id = found;
        }

        q->properties.doorbell_off =
                kfd_get_doorbell_dw_offset_in_bar(dev, q->process,
                                          q->doorbell_id);

        return 0;
}

static void deallocate_doorbell(struct qcm_process_device *qpd,
                                struct queue *q)
{
        unsigned int old;
        struct kfd_dev *dev = qpd->dqm->dev;

        if (!KFD_IS_SOC15(dev->device_info->asic_family) ||
            q->properties.type == KFD_QUEUE_TYPE_SDMA ||
            q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
                return;

        old = test_and_clear_bit(q->doorbell_id, qpd->doorbell_bitmap);
        WARN_ON(!old);
}

static int allocate_vmid(struct device_queue_manager *dqm,
                        struct qcm_process_device *qpd,
                        struct queue *q)
{
        int allocated_vmid = -1, i;

        for (i = dqm->dev->vm_info.first_vmid_kfd;
                        i <= dqm->dev->vm_info.last_vmid_kfd; i++) {
                if (!dqm->vmid_pasid[i]) {
                        allocated_vmid = i;
                        break;
                }
        }

        if (allocated_vmid < 0) {
                pr_err("no more vmid to allocate\n");
                return -ENOSPC;
        }

        pr_debug("vmid allocated: %d\n", allocated_vmid);

        dqm->vmid_pasid[allocated_vmid] = q->process->pasid;

        set_pasid_vmid_mapping(dqm, q->process->pasid, allocated_vmid);

        qpd->vmid = allocated_vmid;
        q->properties.vmid = allocated_vmid;

        program_sh_mem_settings(dqm, qpd);

        /* qpd->page_table_base is set earlier when register_process()
         * is called, i.e. when the first queue is created.
         */
        dqm->dev->kfd2kgd->set_vm_context_page_table_base(dqm->dev->kgd,
                        qpd->vmid,
                        qpd->page_table_base);
        /* invalidate the VM context after pasid and vmid mapping is set up */
        kfd_flush_tlb(qpd_to_pdd(qpd));

        if (dqm->dev->kfd2kgd->set_scratch_backing_va)
                dqm->dev->kfd2kgd->set_scratch_backing_va(dqm->dev->kgd,
                                qpd->sh_hidden_private_base, qpd->vmid);

        return 0;
}

static int flush_texture_cache_nocpsch(struct kfd_dev *kdev,
                                struct qcm_process_device *qpd)
{
        const struct packet_manager_funcs *pmf = qpd->dqm->packets.pmf;
        int ret;

        if (!qpd->ib_kaddr)
                return -ENOMEM;

        ret = pmf->release_mem(qpd->ib_base, (uint32_t *)qpd->ib_kaddr);
        if (ret)
                return ret;

        return amdgpu_amdkfd_submit_ib(kdev->kgd, KGD_ENGINE_MEC1, qpd->vmid,
                                qpd->ib_base, (uint32_t *)qpd->ib_kaddr,
                                pmf->release_mem_size / sizeof(uint32_t));
}

static void deallocate_vmid(struct device_queue_manager *dqm,
                                struct qcm_process_device *qpd,
                                struct queue *q)
{
        /* On GFX v7, CP doesn't flush TC at dequeue */
        if (q->device->device_info->asic_family == CHIP_HAWAII)
                if (flush_texture_cache_nocpsch(q->device, qpd))
                        pr_err("Failed to flush TC\n");

        kfd_flush_tlb(qpd_to_pdd(qpd));

        /* Release the vmid mapping */
        set_pasid_vmid_mapping(dqm, 0, qpd->vmid);
        dqm->vmid_pasid[qpd->vmid] = 0;

        qpd->vmid = 0;
        q->properties.vmid = 0;
}

static int create_queue_nocpsch(struct device_queue_manager *dqm,
                                struct queue *q,
                                struct qcm_process_device *qpd)
{
        struct mqd_manager *mqd_mgr;
        int retval;

        print_queue(q);

        dqm_lock(dqm);

        if (dqm->total_queue_count >= max_num_of_queues_per_device) {
                pr_warn("Can't create new usermode queue because %d queues were already created\n",
                                dqm->total_queue_count);
                retval = -EPERM;
                goto out_unlock;
        }

        if (list_empty(&qpd->queues_list)) {
                retval = allocate_vmid(dqm, qpd, q);
                if (retval)
                        goto out_unlock;
        }
        q->properties.vmid = qpd->vmid;
        /*
         * Eviction state logic: mark all queues as evicted, even ones
         * not currently active. Restoring inactive queues later only
         * updates the is_evicted flag but is a no-op otherwise.
         */
        q->properties.is_evicted = !!qpd->evicted;

        q->properties.tba_addr = qpd->tba_addr;
        q->properties.tma_addr = qpd->tma_addr;

        mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
                        q->properties.type)];
        if (q->properties.type == KFD_QUEUE_TYPE_COMPUTE) {
                retval = allocate_hqd(dqm, q);
                if (retval)
                        goto deallocate_vmid;
                pr_debug("Loading mqd to hqd on pipe %d, queue %d\n",
                        q->pipe, q->queue);
        } else if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
                q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                retval = allocate_sdma_queue(dqm, q);
                if (retval)
                        goto deallocate_vmid;
                dqm->asic_ops.init_sdma_vm(dqm, q, qpd);
        }

        retval = allocate_doorbell(qpd, q);
        if (retval)
                goto out_deallocate_hqd;

        /* Temporarily release dqm lock to avoid a circular lock dependency */
        dqm_unlock(dqm);
        q->mqd_mem_obj = mqd_mgr->allocate_mqd(mqd_mgr->dev, &q->properties);
        dqm_lock(dqm);

        if (!q->mqd_mem_obj) {
                retval = -ENOMEM;
                goto out_deallocate_doorbell;
        }
        mqd_mgr->init_mqd(mqd_mgr, &q->mqd, q->mqd_mem_obj,
                                &q->gart_mqd_addr, &q->properties);
        if (q->properties.is_active) {
                if (!dqm->sched_running) {
                        WARN_ONCE(1, "Load non-HWS mqd while stopped\n");
                        goto add_queue_to_list;
                }

                if (WARN(q->process->mm != current->mm,
                                        "should only run in user thread"))
                        retval = -EFAULT;
                else
                        retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd, q->pipe,
                                        q->queue, &q->properties, current->mm);
                if (retval)
                        goto out_free_mqd;
        }

add_queue_to_list:
        list_add(&q->list, &qpd->queues_list);
        qpd->queue_count++;
        if (q->properties.is_active)
                dqm->queue_count++;

        if (q->properties.type == KFD_QUEUE_TYPE_SDMA)
                dqm->sdma_queue_count++;
        else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
                dqm->xgmi_sdma_queue_count++;

        /*
         * Unconditionally increment this counter, regardless of the queue's
         * type or whether the queue is active.
         */
        dqm->total_queue_count++;
        pr_debug("Total of %d queues are accountable so far\n",
                        dqm->total_queue_count);
        goto out_unlock;

out_free_mqd:
        mqd_mgr->free_mqd(mqd_mgr, q->mqd, q->mqd_mem_obj);
out_deallocate_doorbell:
        deallocate_doorbell(qpd, q);
out_deallocate_hqd:
        if (q->properties.type == KFD_QUEUE_TYPE_COMPUTE)
                deallocate_hqd(dqm, q);
        else if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
                q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
                deallocate_sdma_queue(dqm, q);
deallocate_vmid:
        if (list_empty(&qpd->queues_list))
                deallocate_vmid(dqm, qpd, q);
out_unlock:
        dqm_unlock(dqm);
        return retval;
}

static int allocate_hqd(struct device_queue_manager *dqm, struct queue *q)
{
        bool set;
        int pipe, bit, i;

        set = false;

        for (pipe = dqm->next_pipe_to_allocate, i = 0;
                        i < get_pipes_per_mec(dqm);
                        pipe = ((pipe + 1) % get_pipes_per_mec(dqm)), ++i) {

                if (!is_pipe_enabled(dqm, 0, pipe))
                        continue;

                if (dqm->allocated_queues[pipe] != 0) {
                        bit = ffs(dqm->allocated_queues[pipe]) - 1;
                        dqm->allocated_queues[pipe] &= ~(1 << bit);
                        q->pipe = pipe;
                        q->queue = bit;
                        set = true;
                        break;
                }
        }

        if (!set)
                return -EBUSY;

        pr_debug("hqd slot - pipe %d, queue %d\n", q->pipe, q->queue);
        /* horizontal hqd allocation */
        dqm->next_pipe_to_allocate = (pipe + 1) % get_pipes_per_mec(dqm);

        return 0;
}

static inline void deallocate_hqd(struct device_queue_manager *dqm,
                                struct queue *q)
{
        dqm->allocated_queues[q->pipe] |= (1 << q->queue);
}

/* Access to DQM has to be locked before calling destroy_queue_nocpsch_locked
 * to avoid asynchronized access
 */
static int destroy_queue_nocpsch_locked(struct device_queue_manager *dqm,
                                struct qcm_process_device *qpd,
                                struct queue *q)
{
        int retval;
        struct mqd_manager *mqd_mgr;

        mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
                        q->properties.type)];

        if (q->properties.type == KFD_QUEUE_TYPE_COMPUTE) {
                deallocate_hqd(dqm, q);
        } else if (q->properties.type == KFD_QUEUE_TYPE_SDMA) {
                dqm->sdma_queue_count--;
                deallocate_sdma_queue(dqm, q);
        } else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                dqm->xgmi_sdma_queue_count--;
                deallocate_sdma_queue(dqm, q);
        } else {
                pr_debug("q->properties.type %d is invalid\n",
                                q->properties.type);
                return -EINVAL;
        }
        dqm->total_queue_count--;

        deallocate_doorbell(qpd, q);

        if (!dqm->sched_running) {
                WARN_ONCE(1, "Destroy non-HWS queue while stopped\n");
                return 0;
        }

        retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
                                KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
                                KFD_UNMAP_LATENCY_MS,
                                q->pipe, q->queue);
        if (retval == -ETIME)
                qpd->reset_wavefronts = true;

        mqd_mgr->free_mqd(mqd_mgr, q->mqd, q->mqd_mem_obj);

        list_del(&q->list);
        if (list_empty(&qpd->queues_list)) {
                if (qpd->reset_wavefronts) {
                        pr_warn("Resetting wave fronts (nocpsch) on dev %p\n",
                                        dqm->dev);
                        /* dbgdev_wave_reset_wavefronts has to be called before
                         * deallocate_vmid(), i.e. when vmid is still in use.
                         */
                        dbgdev_wave_reset_wavefronts(dqm->dev,
                                        qpd->pqm->process);
                        qpd->reset_wavefronts = false;
                }

                deallocate_vmid(dqm, qpd, q);
        }
        qpd->queue_count--;
        if (q->properties.is_active)
                dqm->queue_count--;

        return retval;
}

static int destroy_queue_nocpsch(struct device_queue_manager *dqm,
                                struct qcm_process_device *qpd,
                                struct queue *q)
{
        int retval;

        dqm_lock(dqm);
        retval = destroy_queue_nocpsch_locked(dqm, qpd, q);
        dqm_unlock(dqm);

        return retval;
}

static int update_queue(struct device_queue_manager *dqm, struct queue *q)
{
        int retval = 0;
        struct mqd_manager *mqd_mgr;
        struct kfd_process_device *pdd;
        bool prev_active = false;

        dqm_lock(dqm);
        pdd = kfd_get_process_device_data(q->device, q->process);
        if (!pdd) {
                retval = -ENODEV;
                goto out_unlock;
        }
        mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
                        q->properties.type)];

        /* Save previous activity state for counters */
        prev_active = q->properties.is_active;

        /* Make sure the queue is unmapped before updating the MQD */
        if (dqm->sched_policy != KFD_SCHED_POLICY_NO_HWS) {
                retval = unmap_queues_cpsch(dqm,
                                KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
                if (retval) {
                        pr_err("unmap queue failed\n");
                        goto out_unlock;
                }
        } else if (prev_active &&
                   (q->properties.type == KFD_QUEUE_TYPE_COMPUTE ||
                    q->properties.type == KFD_QUEUE_TYPE_SDMA ||
                    q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)) {

                if (!dqm->sched_running) {
                        WARN_ONCE(1, "Update non-HWS queue while stopped\n");
                        goto out_unlock;
                }

                retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
                                KFD_PREEMPT_TYPE_WAVEFRONT_DRAIN,
                                KFD_UNMAP_LATENCY_MS, q->pipe, q->queue);
                if (retval) {
                        pr_err("destroy mqd failed\n");
                        goto out_unlock;
                }
        }

        mqd_mgr->update_mqd(mqd_mgr, q->mqd, &q->properties);

        /*
         * check active state vs. the previous state and modify
         * counter accordingly. map_queues_cpsch uses the
         * dqm->queue_count to determine whether a new runlist must be
         * uploaded.
         */
        if (q->properties.is_active && !prev_active)
                dqm->queue_count++;
        else if (!q->properties.is_active && prev_active)
                dqm->queue_count--;

        if (dqm->sched_policy != KFD_SCHED_POLICY_NO_HWS)
                retval = map_queues_cpsch(dqm);
        else if (q->properties.is_active &&
                 (q->properties.type == KFD_QUEUE_TYPE_COMPUTE ||
                  q->properties.type == KFD_QUEUE_TYPE_SDMA ||
                  q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)) {
                if (WARN(q->process->mm != current->mm,
                         "should only run in user thread"))
                        retval = -EFAULT;
                else
                        retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd,
                                                   q->pipe, q->queue,
                                                   &q->properties, current->mm);
        }

out_unlock:
        dqm_unlock(dqm);
        return retval;
}

static int evict_process_queues_nocpsch(struct device_queue_manager *dqm,
                                        struct qcm_process_device *qpd)
{
        struct queue *q;
        struct mqd_manager *mqd_mgr;
        struct kfd_process_device *pdd;
        int retval, ret = 0;

        dqm_lock(dqm);
        if (qpd->evicted++ > 0) /* already evicted, do nothing */
                goto out;

        pdd = qpd_to_pdd(qpd);
        pr_info_ratelimited("Evicting PASID 0x%x queues\n",
                            pdd->process->pasid);

        /* Mark all queues as evicted. Deactivate all active queues on
         * the qpd.
         */
        list_for_each_entry(q, &qpd->queues_list, list) {
                q->properties.is_evicted = true;
                if (!q->properties.is_active)
                        continue;

                mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
                                q->properties.type)];
                q->properties.is_active = false;
                dqm->queue_count--;

                if (WARN_ONCE(!dqm->sched_running, "Evict when stopped\n"))
                        continue;

                retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
                                KFD_PREEMPT_TYPE_WAVEFRONT_DRAIN,
                                KFD_UNMAP_LATENCY_MS, q->pipe, q->queue);
                if (retval && !ret)
                        /* Return the first error, but keep going to
                         * maintain a consistent eviction state
                         */
                        ret = retval;
        }

out:
        dqm_unlock(dqm);
        return ret;
}

static int evict_process_queues_cpsch(struct device_queue_manager *dqm,
                                      struct qcm_process_device *qpd)
{
        struct queue *q;
        struct kfd_process_device *pdd;
        int retval = 0;

        dqm_lock(dqm);
        if (qpd->evicted++ > 0) /* already evicted, do nothing */
                goto out;

        pdd = qpd_to_pdd(qpd);
        pr_info_ratelimited("Evicting PASID 0x%x queues\n",
                            pdd->process->pasid);

        /* Mark all queues as evicted. Deactivate all active queues on
         * the qpd.
         */
        list_for_each_entry(q, &qpd->queues_list, list) {
                q->properties.is_evicted = true;
                if (!q->properties.is_active)
                        continue;

                q->properties.is_active = false;
                dqm->queue_count--;
        }
        retval = execute_queues_cpsch(dqm,
                                qpd->is_debug ?
                                KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES :
                                KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);

out:
        dqm_unlock(dqm);
        return retval;
}

static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
                                          struct qcm_process_device *qpd)
{
        struct mm_struct *mm = NULL;
        struct queue *q;
        struct mqd_manager *mqd_mgr;
        struct kfd_process_device *pdd;
        uint64_t pd_base;
        int retval, ret = 0;

        pdd = qpd_to_pdd(qpd);
        /* Retrieve PD base */
        pd_base = amdgpu_amdkfd_gpuvm_get_process_page_dir(pdd->vm);

        dqm_lock(dqm);
        if (WARN_ON_ONCE(!qpd->evicted)) /* already restored, do nothing */
                goto out;
        if (qpd->evicted > 1) { /* ref count still > 0, decrement & quit */
                qpd->evicted--;
                goto out;
        }

        pr_info_ratelimited("Restoring PASID 0x%x queues\n",
                            pdd->process->pasid);

        /* Update PD Base in QPD */
        qpd->page_table_base = pd_base;
        pr_debug("Updated PD address to 0x%llx\n", pd_base);

        if (!list_empty(&qpd->queues_list)) {
                dqm->dev->kfd2kgd->set_vm_context_page_table_base(
                                dqm->dev->kgd,
                                qpd->vmid,
                                qpd->page_table_base);
                kfd_flush_tlb(pdd);
        }

        /* Take a safe reference to the mm_struct, which may otherwise
         * disappear even while the kfd_process is still referenced.
         */
        mm = get_task_mm(pdd->process->lead_thread);
        if (!mm) {
                ret = -EFAULT;
                goto out;
        }

        /* Remove the eviction flags. Activate queues that are not
         * inactive for other reasons.
         */
        list_for_each_entry(q, &qpd->queues_list, list) {
                q->properties.is_evicted = false;
                if (!QUEUE_IS_ACTIVE(q->properties))
                        continue;

                mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
                                q->properties.type)];
                q->properties.is_active = true;
                dqm->queue_count++;

                if (WARN_ONCE(!dqm->sched_running, "Restore when stopped\n"))
                        continue;

                retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd, q->pipe,
                                       q->queue, &q->properties, mm);
                if (retval && !ret)
                        /* Return the first error, but keep going to
                         * maintain a consistent eviction state
                         */
                        ret = retval;
        }
        qpd->evicted = 0;
out:
        if (mm)
                mmput(mm);
        dqm_unlock(dqm);
        return ret;
}

static int restore_process_queues_cpsch(struct device_queue_manager *dqm,
                                        struct qcm_process_device *qpd)
{
        struct queue *q;
        struct kfd_process_device *pdd;
        uint64_t pd_base;
        int retval = 0;

        pdd = qpd_to_pdd(qpd);
        /* Retrieve PD base */
        pd_base = amdgpu_amdkfd_gpuvm_get_process_page_dir(pdd->vm);

        dqm_lock(dqm);
        if (WARN_ON_ONCE(!qpd->evicted)) /* already restored, do nothing */
                goto out;
        if (qpd->evicted > 1) { /* ref count still > 0, decrement & quit */
                qpd->evicted--;
                goto out;
        }

        pr_info_ratelimited("Restoring PASID 0x%x queues\n",
                            pdd->process->pasid);

        /* Update PD Base in QPD */
        qpd->page_table_base = pd_base;
        pr_debug("Updated PD address to 0x%llx\n", pd_base);

        /* activate all active queues on the qpd */
        list_for_each_entry(q, &qpd->queues_list, list) {
                q->properties.is_evicted = false;
                if (!QUEUE_IS_ACTIVE(q->properties))
                        continue;

                q->properties.is_active = true;
                dqm->queue_count++;
        }
        retval = execute_queues_cpsch(dqm,
                                KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
        qpd->evicted = 0;
out:
        dqm_unlock(dqm);
        return retval;
}

static int register_process(struct device_queue_manager *dqm,
                                        struct qcm_process_device *qpd)
{
        struct device_process_node *n;
        struct kfd_process_device *pdd;
        uint64_t pd_base;
        int retval;

        n = kzalloc(sizeof(*n), GFP_KERNEL);
        if (!n)
                return -ENOMEM;

        n->qpd = qpd;

        pdd = qpd_to_pdd(qpd);
        /* Retrieve PD base */
        pd_base = amdgpu_amdkfd_gpuvm_get_process_page_dir(pdd->vm);

        dqm_lock(dqm);
        list_add(&n->list, &dqm->queues);

        /* Update PD Base in QPD */
        qpd->page_table_base = pd_base;
        pr_debug("Updated PD address to 0x%llx\n", pd_base);

        retval = dqm->asic_ops.update_qpd(dqm, qpd);

        dqm->processes_count++;

        dqm_unlock(dqm);

        /* Outside the DQM lock because under the DQM lock we can't do
         * reclaim or take other locks that others hold while reclaiming.
         */
        kfd_inc_compute_active(dqm->dev);

        return retval;
}

static int unregister_process(struct device_queue_manager *dqm,
                                        struct qcm_process_device *qpd)
{
        int retval;
        struct device_process_node *cur, *next;

        pr_debug("qpd->queues_list is %s\n",
                        list_empty(&qpd->queues_list) ? "empty" : "not empty");

        retval = 0;
        dqm_lock(dqm);

        list_for_each_entry_safe(cur, next, &dqm->queues, list) {
                if (qpd == cur->qpd) {
                        list_del(&cur->list);
                        kfree(cur);
                        dqm->processes_count--;
                        goto out;
                }
        }
        /* qpd not found in dqm list */
        retval = 1;
out:
        dqm_unlock(dqm);

        /* Outside the DQM lock because under the DQM lock we can't do
         * reclaim or take other locks that others hold while reclaiming.
         */
        if (!retval)
                kfd_dec_compute_active(dqm->dev);

        return retval;
}

static int
set_pasid_vmid_mapping(struct device_queue_manager *dqm, unsigned int pasid,
                        unsigned int vmid)
{
        return dqm->dev->kfd2kgd->set_pasid_vmid_mapping(
                                                dqm->dev->kgd, pasid, vmid);
}

static void init_interrupts(struct device_queue_manager *dqm)
{
        unsigned int i;

        for (i = 0 ; i < get_pipes_per_mec(dqm) ; i++)
                if (is_pipe_enabled(dqm, 0, i))
                        dqm->dev->kfd2kgd->init_interrupts(dqm->dev->kgd, i);
}

static int initialize_nocpsch(struct device_queue_manager *dqm)
{
        int pipe, queue;

        pr_debug("num of pipes: %d\n", get_pipes_per_mec(dqm));

        dqm->allocated_queues = kcalloc(get_pipes_per_mec(dqm),
                                        sizeof(unsigned int), GFP_KERNEL);
        if (!dqm->allocated_queues)
                return -ENOMEM;

        mutex_init(&dqm->lock_hidden);
        INIT_LIST_HEAD(&dqm->queues);
        dqm->queue_count = dqm->next_pipe_to_allocate = 0;
        dqm->sdma_queue_count = 0;
        dqm->xgmi_sdma_queue_count = 0;

        for (pipe = 0; pipe < get_pipes_per_mec(dqm); pipe++) {
                int pipe_offset = pipe * get_queues_per_pipe(dqm);

                for (queue = 0; queue < get_queues_per_pipe(dqm); queue++)
                        if (test_bit(pipe_offset + queue,
                                     dqm->dev->shared_resources.queue_bitmap))
                                dqm->allocated_queues[pipe] |= 1 << queue;
        }

        memset(dqm->vmid_pasid, 0, sizeof(dqm->vmid_pasid));

        dqm->sdma_bitmap = ~0ULL >> (64 - get_num_sdma_queues(dqm));
        dqm->xgmi_sdma_bitmap = ~0ULL >> (64 - get_num_xgmi_sdma_queues(dqm));

        return 0;
}

static void uninitialize(struct device_queue_manager *dqm)
{
        int i;

        WARN_ON(dqm->queue_count > 0 || dqm->processes_count > 0);

        kfree(dqm->allocated_queues);
        for (i = 0 ; i < KFD_MQD_TYPE_MAX ; i++)
                kfree(dqm->mqd_mgrs[i]);
        mutex_destroy(&dqm->lock_hidden);
}

static int start_nocpsch(struct device_queue_manager *dqm)
{
        pr_info("SW scheduler is used");
        init_interrupts(dqm);
        
        if (dqm->dev->device_info->asic_family == CHIP_HAWAII)
                return pm_init(&dqm->packets, dqm);
        dqm->sched_running = true;

        return 0;
}

static int stop_nocpsch(struct device_queue_manager *dqm)
{
        if (dqm->dev->device_info->asic_family == CHIP_HAWAII)
                pm_uninit(&dqm->packets, false);
        dqm->sched_running = false;

        return 0;
}

static void pre_reset(struct device_queue_manager *dqm)
{
        dqm_lock(dqm);
        dqm->is_resetting = true;
        dqm_unlock(dqm);
}

static int allocate_sdma_queue(struct device_queue_manager *dqm,
                                struct queue *q)
{
        int bit;

        if (q->properties.type == KFD_QUEUE_TYPE_SDMA) {
                if (dqm->sdma_bitmap == 0)
                        return -ENOMEM;
                bit = __ffs64(dqm->sdma_bitmap);
                dqm->sdma_bitmap &= ~(1ULL << bit);
                q->sdma_id = bit;
                q->properties.sdma_engine_id = q->sdma_id %
                                get_num_sdma_engines(dqm);
                q->properties.sdma_queue_id = q->sdma_id /
                                get_num_sdma_engines(dqm);
        } else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                if (dqm->xgmi_sdma_bitmap == 0)
                        return -ENOMEM;
                bit = __ffs64(dqm->xgmi_sdma_bitmap);
                dqm->xgmi_sdma_bitmap &= ~(1ULL << bit);
                q->sdma_id = bit;
                /* sdma_engine_id is sdma id including
                 * both PCIe-optimized SDMAs and XGMI-
                 * optimized SDMAs. The calculation below
                 * assumes the first N engines are always
                 * PCIe-optimized ones
                 */
                q->properties.sdma_engine_id = get_num_sdma_engines(dqm) +
                                q->sdma_id % get_num_xgmi_sdma_engines(dqm);
                q->properties.sdma_queue_id = q->sdma_id /
                                get_num_xgmi_sdma_engines(dqm);
        }

        pr_debug("SDMA engine id: %d\n", q->properties.sdma_engine_id);
        pr_debug("SDMA queue id: %d\n", q->properties.sdma_queue_id);

        return 0;
}

static void deallocate_sdma_queue(struct device_queue_manager *dqm,
                                struct queue *q)
{
        if (q->properties.type == KFD_QUEUE_TYPE_SDMA) {
                if (q->sdma_id >= get_num_sdma_queues(dqm))
                        return;
                dqm->sdma_bitmap |= (1ULL << q->sdma_id);
        } else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                if (q->sdma_id >= get_num_xgmi_sdma_queues(dqm))
                        return;
                dqm->xgmi_sdma_bitmap |= (1ULL << q->sdma_id);
        }
}

/*
 * Device Queue Manager implementation for cp scheduler
 */

static int set_sched_resources(struct device_queue_manager *dqm)
{
        int i, mec;
        struct scheduling_resources res;

        res.vmid_mask = dqm->dev->shared_resources.compute_vmid_bitmap;

        res.queue_mask = 0;
        for (i = 0; i < KGD_MAX_QUEUES; ++i) {
                mec = (i / dqm->dev->shared_resources.num_queue_per_pipe)
                        / dqm->dev->shared_resources.num_pipe_per_mec;

                if (!test_bit(i, dqm->dev->shared_resources.queue_bitmap))
                        continue;

                /* only acquire queues from the first MEC */
                if (mec > 0)
                        continue;

                /* This situation may be hit in the future if a new HW
                 * generation exposes more than 64 queues. If so, the
                 * definition of res.queue_mask needs updating
                 */
                if (WARN_ON(i >= (sizeof(res.queue_mask)*8))) {
                        pr_err("Invalid queue enabled by amdgpu: %d\n", i);
                        break;
                }

                res.queue_mask |= (1ull << i);
        }
        res.gws_mask = ~0ull;
        res.oac_mask = res.gds_heap_base = res.gds_heap_size = 0;

        pr_debug("Scheduling resources:\n"
                        "vmid mask: 0x%8X\n"
                        "queue mask: 0x%8llX\n",
                        res.vmid_mask, res.queue_mask);

        return pm_send_set_resources(&dqm->packets, &res);
}

static int initialize_cpsch(struct device_queue_manager *dqm)
{
        pr_debug("num of pipes: %d\n", get_pipes_per_mec(dqm));

        mutex_init(&dqm->lock_hidden);
        INIT_LIST_HEAD(&dqm->queues);
        dqm->queue_count = dqm->processes_count = 0;
        dqm->sdma_queue_count = 0;
        dqm->xgmi_sdma_queue_count = 0;
        dqm->active_runlist = false;
        dqm->sdma_bitmap = ~0ULL >> (64 - get_num_sdma_queues(dqm));
        dqm->xgmi_sdma_bitmap = ~0ULL >> (64 - get_num_xgmi_sdma_queues(dqm));

        INIT_WORK(&dqm->hw_exception_work, kfd_process_hw_exception);

        return 0;
}

static int start_cpsch(struct device_queue_manager *dqm)
{
        int retval;

        retval = 0;

        retval = pm_init(&dqm->packets, dqm);
        if (retval)
                goto fail_packet_manager_init;

        retval = set_sched_resources(dqm);
        if (retval)
                goto fail_set_sched_resources;

        pr_debug("Allocating fence memory\n");

        /* allocate fence memory on the gart */
        retval = kfd_gtt_sa_allocate(dqm->dev, sizeof(*dqm->fence_addr),
                                        &dqm->fence_mem);

        if (retval)
                goto fail_allocate_vidmem;

        dqm->fence_addr = dqm->fence_mem->cpu_ptr;
        dqm->fence_gpu_addr = dqm->fence_mem->gpu_addr;

        init_interrupts(dqm);

        dqm_lock(dqm);
        /* clear hang status when driver try to start the hw scheduler */
        dqm->is_hws_hang = false;
        dqm->is_resetting = false;
        dqm->sched_running = true;
        execute_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
        dqm_unlock(dqm);

        return 0;
fail_allocate_vidmem:
fail_set_sched_resources:
        pm_uninit(&dqm->packets, false);
fail_packet_manager_init:
        return retval;
}

static int stop_cpsch(struct device_queue_manager *dqm)
{
        bool hanging;

        dqm_lock(dqm);
        if (!dqm->is_hws_hang)
                unmap_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0);
        hanging = dqm->is_hws_hang || dqm->is_resetting;
        dqm->sched_running = false;
        dqm_unlock(dqm);

        kfd_gtt_sa_free(dqm->dev, dqm->fence_mem);
        pm_uninit(&dqm->packets, hanging);

        return 0;
}

static int create_kernel_queue_cpsch(struct device_queue_manager *dqm,
                                        struct kernel_queue *kq,
                                        struct qcm_process_device *qpd)
{
        dqm_lock(dqm);
        if (dqm->total_queue_count >= max_num_of_queues_per_device) {
                pr_warn("Can't create new kernel queue because %d queues were already created\n",
                                dqm->total_queue_count);
                dqm_unlock(dqm);
                return -EPERM;
        }

        /*
         * Unconditionally increment this counter, regardless of the queue's
         * type or whether the queue is active.
         */
        dqm->total_queue_count++;
        pr_debug("Total of %d queues are accountable so far\n",
                        dqm->total_queue_count);

        list_add(&kq->list, &qpd->priv_queue_list);
        dqm->queue_count++;
        qpd->is_debug = true;
        execute_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
        dqm_unlock(dqm);

        return 0;
}

static void destroy_kernel_queue_cpsch(struct device_queue_manager *dqm,
                                        struct kernel_queue *kq,
                                        struct qcm_process_device *qpd)
{
        dqm_lock(dqm);
        list_del(&kq->list);
        dqm->queue_count--;
        qpd->is_debug = false;
        execute_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0);
        /*
         * Unconditionally decrement this counter, regardless of the queue's
         * type.
         */
        dqm->total_queue_count--;
        pr_debug("Total of %d queues are accountable so far\n",
                        dqm->total_queue_count);
        dqm_unlock(dqm);
}

static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
                        struct qcm_process_device *qpd)
{
        int retval;
        struct mqd_manager *mqd_mgr;

        if (dqm->total_queue_count >= max_num_of_queues_per_device) {
                pr_warn("Can't create new usermode queue because %d queues were already created\n",
                                dqm->total_queue_count);
                retval = -EPERM;
                goto out;
        }

        if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
                q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                dqm_lock(dqm);
                retval = allocate_sdma_queue(dqm, q);
                dqm_unlock(dqm);
                if (retval)
                        goto out;
        }

        retval = allocate_doorbell(qpd, q);
        if (retval)
                goto out_deallocate_sdma_queue;

        mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
                        q->properties.type)];

        if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
                q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
                dqm->asic_ops.init_sdma_vm(dqm, q, qpd);
        q->properties.tba_addr = qpd->tba_addr;
        q->properties.tma_addr = qpd->tma_addr;
        q->mqd_mem_obj = mqd_mgr->allocate_mqd(mqd_mgr->dev, &q->properties);
        if (!q->mqd_mem_obj) {
                retval = -ENOMEM;
                goto out_deallocate_doorbell;
        }

        dqm_lock(dqm);
        /*
         * Eviction state logic: mark all queues as evicted, even ones
         * not currently active. Restoring inactive queues later only
         * updates the is_evicted flag but is a no-op otherwise.
         */
        q->properties.is_evicted = !!qpd->evicted;
        mqd_mgr->init_mqd(mqd_mgr, &q->mqd, q->mqd_mem_obj,
                                &q->gart_mqd_addr, &q->properties);

        list_add(&q->list, &qpd->queues_list);
        qpd->queue_count++;

        if (q->properties.type == KFD_QUEUE_TYPE_SDMA)
                dqm->sdma_queue_count++;
        else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
                dqm->xgmi_sdma_queue_count++;

        if (q->properties.is_active) {
                dqm->queue_count++;
                retval = execute_queues_cpsch(dqm,
                                KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
        }

        /*
         * Unconditionally increment this counter, regardless of the queue's
         * type or whether the queue is active.
         */
        dqm->total_queue_count++;

        pr_debug("Total of %d queues are accountable so far\n",
                        dqm->total_queue_count);

        dqm_unlock(dqm);
        return retval;

out_deallocate_doorbell:
        deallocate_doorbell(qpd, q);
out_deallocate_sdma_queue:
        if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
                q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                dqm_lock(dqm);
                deallocate_sdma_queue(dqm, q);
                dqm_unlock(dqm);
        }
out:
        return retval;
}

int amdkfd_fence_wait_timeout(unsigned int *fence_addr,
                                unsigned int fence_value,
                                unsigned int timeout_ms)
{
        unsigned long end_jiffies = msecs_to_jiffies(timeout_ms) + jiffies;

        while (*fence_addr != fence_value) {
                if (time_after(jiffies, end_jiffies)) {
                        pr_err("qcm fence wait loop timeout expired\n");
                        /* In HWS case, this is used to halt the driver thread
                         * in order not to mess up CP states before doing
                         * scandumps for FW debugging.
                         */
                        while (halt_if_hws_hang)
                                schedule();

                        return -ETIME;
                }
                schedule();
        }

        return 0;
}

static int unmap_sdma_queues(struct device_queue_manager *dqm)
{
        int i, retval = 0;

        for (i = 0; i < dqm->dev->device_info->num_sdma_engines +
                dqm->dev->device_info->num_xgmi_sdma_engines; i++) {
                retval = pm_send_unmap_queue(&dqm->packets, KFD_QUEUE_TYPE_SDMA,
                        KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0, false, i);
                if (retval)
                        return retval;
        }
        return retval;
}

/* dqm->lock mutex has to be locked before calling this function */
static int map_queues_cpsch(struct device_queue_manager *dqm)
{
        int retval;

        if (!dqm->sched_running)
                return 0;
        if (dqm->queue_count <= 0 || dqm->processes_count <= 0)
                return 0;
        if (dqm->active_runlist)
                return 0;

        retval = pm_send_runlist(&dqm->packets, &dqm->queues);
        pr_debug("%s sent runlist\n", __func__);
        if (retval) {
                pr_err("failed to execute runlist\n");
                return retval;
        }
        dqm->active_runlist = true;

        return retval;
}

/* dqm->lock mutex has to be locked before calling this function */
static int unmap_queues_cpsch(struct device_queue_manager *dqm,
                                enum kfd_unmap_queues_filter filter,
                                uint32_t filter_param)
{
        int retval = 0;

        if (!dqm->sched_running)
                return 0;
        if (dqm->is_hws_hang)
                return -EIO;
        if (!dqm->active_runlist)
                return retval;

        pr_debug("Before destroying queues, sdma queue count is : %u, xgmi sdma queue count is : %u\n",
                dqm->sdma_queue_count, dqm->xgmi_sdma_queue_count);

        if (dqm->sdma_queue_count > 0 || dqm->xgmi_sdma_queue_count)
                unmap_sdma_queues(dqm);

        retval = pm_send_unmap_queue(&dqm->packets, KFD_QUEUE_TYPE_COMPUTE,
                        filter, filter_param, false, 0);
        if (retval)
                return retval;

        *dqm->fence_addr = KFD_FENCE_INIT;
        pm_send_query_status(&dqm->packets, dqm->fence_gpu_addr,
                                KFD_FENCE_COMPLETED);
        /* should be timed out */
        retval = amdkfd_fence_wait_timeout(dqm->fence_addr, KFD_FENCE_COMPLETED,
                                queue_preemption_timeout_ms);
        if (retval) {
                pr_err("The cp might be in an unrecoverable state due to an unsuccessful queues preemption\n");
                dqm->is_hws_hang = true;
                /* It's possible we're detecting a HWS hang in the
                 * middle of a GPU reset. No need to schedule another
                 * reset in this case.
                 */
                if (!dqm->is_resetting)
                        schedule_work(&dqm->hw_exception_work);
                return retval;
        }

        pm_release_ib(&dqm->packets);
        dqm->active_runlist = false;

        return retval;
}

/* dqm->lock mutex has to be locked before calling this function */
static int execute_queues_cpsch(struct device_queue_manager *dqm,
                                enum kfd_unmap_queues_filter filter,
                                uint32_t filter_param)
{
        int retval;

        if (dqm->is_hws_hang)
                return -EIO;
        retval = unmap_queues_cpsch(dqm, filter, filter_param);
        if (retval)
                return retval;

        return map_queues_cpsch(dqm);
}

static int destroy_queue_cpsch(struct device_queue_manager *dqm,
                                struct qcm_process_device *qpd,
                                struct queue *q)
{
        int retval;
        struct mqd_manager *mqd_mgr;

        retval = 0;

        /* remove queue from list to prevent rescheduling after preemption */
        dqm_lock(dqm);

        if (qpd->is_debug) {
                /*
                 * error, currently we do not allow to destroy a queue
                 * of a currently debugged process
                 */
                retval = -EBUSY;
                goto failed_try_destroy_debugged_queue;

        }

        mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
                        q->properties.type)];

        deallocate_doorbell(qpd, q);

        if (q->properties.type == KFD_QUEUE_TYPE_SDMA) {
                dqm->sdma_queue_count--;
                deallocate_sdma_queue(dqm, q);
        } else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                dqm->xgmi_sdma_queue_count--;
                deallocate_sdma_queue(dqm, q);
        }

        list_del(&q->list);
        qpd->queue_count--;
        if (q->properties.is_active) {
                dqm->queue_count--;
                retval = execute_queues_cpsch(dqm,
                                KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
                if (retval == -ETIME)
                        qpd->reset_wavefronts = true;
        }

        /*
         * Unconditionally decrement this counter, regardless of the queue's
         * type
         */
        dqm->total_queue_count--;
        pr_debug("Total of %d queues are accountable so far\n",
                        dqm->total_queue_count);

        dqm_unlock(dqm);

        /* Do free_mqd after dqm_unlock(dqm) to avoid circular locking */
        mqd_mgr->free_mqd(mqd_mgr, q->mqd, q->mqd_mem_obj);

        return retval;

failed_try_destroy_debugged_queue:

        dqm_unlock(dqm);
        return retval;
}

/*
 * Low bits must be 0000/FFFF as required by HW, high bits must be 0 to
 * stay in user mode.
 */
#define APE1_FIXED_BITS_MASK 0xFFFF80000000FFFFULL
/* APE1 limit is inclusive and 64K aligned. */
#define APE1_LIMIT_ALIGNMENT 0xFFFF

static bool set_cache_memory_policy(struct device_queue_manager *dqm,
                                   struct qcm_process_device *qpd,
                                   enum cache_policy default_policy,
                                   enum cache_policy alternate_policy,
                                   void __user *alternate_aperture_base,
                                   uint64_t alternate_aperture_size)
{
        bool retval = true;

        if (!dqm->asic_ops.set_cache_memory_policy)
                return retval;

        dqm_lock(dqm);

        if (alternate_aperture_size == 0) {
                /* base > limit disables APE1 */
                qpd->sh_mem_ape1_base = 1;
                qpd->sh_mem_ape1_limit = 0;
        } else {
                /*
                 * In FSA64, APE1_Base[63:0] = { 16{SH_MEM_APE1_BASE[31]},
                 *                      SH_MEM_APE1_BASE[31:0], 0x0000 }
                 * APE1_Limit[63:0] = { 16{SH_MEM_APE1_LIMIT[31]},
                 *                      SH_MEM_APE1_LIMIT[31:0], 0xFFFF }
                 * Verify that the base and size parameters can be
                 * represented in this format and convert them.
                 * Additionally restrict APE1 to user-mode addresses.
                 */

                uint64_t base = (uintptr_t)alternate_aperture_base;
                uint64_t limit = base + alternate_aperture_size - 1;

                if (limit <= base || (base & APE1_FIXED_BITS_MASK) != 0 ||
                   (limit & APE1_FIXED_BITS_MASK) != APE1_LIMIT_ALIGNMENT) {
                        retval = false;
                        goto out;
                }

                qpd->sh_mem_ape1_base = base >> 16;
                qpd->sh_mem_ape1_limit = limit >> 16;
        }

        retval = dqm->asic_ops.set_cache_memory_policy(
                        dqm,
                        qpd,
                        default_policy,
                        alternate_policy,
                        alternate_aperture_base,
                        alternate_aperture_size);

        if ((dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) && (qpd->vmid != 0))
                program_sh_mem_settings(dqm, qpd);

        pr_debug("sh_mem_config: 0x%x, ape1_base: 0x%x, ape1_limit: 0x%x\n",
                qpd->sh_mem_config, qpd->sh_mem_ape1_base,
                qpd->sh_mem_ape1_limit);

out:
        dqm_unlock(dqm);
        return retval;
}

static int set_trap_handler(struct device_queue_manager *dqm,
                                struct qcm_process_device *qpd,
                                uint64_t tba_addr,
                                uint64_t tma_addr)
{
        uint64_t *tma;

        if (dqm->dev->cwsr_enabled) {
                /* Jump from CWSR trap handler to user trap */
                tma = (uint64_t *)(qpd->cwsr_kaddr + KFD_CWSR_TMA_OFFSET);
                tma[0] = tba_addr;
                tma[1] = tma_addr;
        } else {
                qpd->tba_addr = tba_addr;
                qpd->tma_addr = tma_addr;
        }

        return 0;
}

static int process_termination_nocpsch(struct device_queue_manager *dqm,
                struct qcm_process_device *qpd)
{
        struct queue *q, *next;
        struct device_process_node *cur, *next_dpn;
        int retval = 0;
        bool found = false;

        dqm_lock(dqm);

        /* Clear all user mode queues */
        list_for_each_entry_safe(q, next, &qpd->queues_list, list) {
                int ret;

                ret = destroy_queue_nocpsch_locked(dqm, qpd, q);
                if (ret)
                        retval = ret;
        }

        /* Unregister process */
        list_for_each_entry_safe(cur, next_dpn, &dqm->queues, list) {
                if (qpd == cur->qpd) {
                        list_del(&cur->list);
                        kfree(cur);
                        dqm->processes_count--;
                        found = true;
                        break;
                }
        }

        dqm_unlock(dqm);

        /* Outside the DQM lock because under the DQM lock we can't do
         * reclaim or take other locks that others hold while reclaiming.
         */
        if (found)
                kfd_dec_compute_active(dqm->dev);

        return retval;
}

static int get_wave_state(struct device_queue_manager *dqm,
                          struct queue *q,
                          void __user *ctl_stack,
                          u32 *ctl_stack_used_size,
                          u32 *save_area_used_size)
{
        struct mqd_manager *mqd_mgr;
        int r;

        dqm_lock(dqm);

        if (q->properties.type != KFD_QUEUE_TYPE_COMPUTE ||
            q->properties.is_active || !q->device->cwsr_enabled) {
                r = -EINVAL;
                goto dqm_unlock;
        }

        mqd_mgr = dqm->mqd_mgrs[KFD_MQD_TYPE_CP];

        if (!mqd_mgr->get_wave_state) {
                r = -EINVAL;
                goto dqm_unlock;
        }

        r = mqd_mgr->get_wave_state(mqd_mgr, q->mqd, ctl_stack,
                        ctl_stack_used_size, save_area_used_size);

dqm_unlock:
        dqm_unlock(dqm);
        return r;
}

static int process_termination_cpsch(struct device_queue_manager *dqm,
                struct qcm_process_device *qpd)
{
        int retval;
        struct queue *q, *next;
        struct kernel_queue *kq, *kq_next;
        struct mqd_manager *mqd_mgr;
        struct device_process_node *cur, *next_dpn;
        enum kfd_unmap_queues_filter filter =
                KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES;
        bool found = false;

        retval = 0;

        dqm_lock(dqm);

        /* Clean all kernel queues */
        list_for_each_entry_safe(kq, kq_next, &qpd->priv_queue_list, list) {
                list_del(&kq->list);
                dqm->queue_count--;
                qpd->is_debug = false;
                dqm->total_queue_count--;
                filter = KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES;
        }

        /* Clear all user mode queues */
        list_for_each_entry(q, &qpd->queues_list, list) {
                if (q->properties.type == KFD_QUEUE_TYPE_SDMA) {
                        dqm->sdma_queue_count--;
                        deallocate_sdma_queue(dqm, q);
                } else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
                        dqm->xgmi_sdma_queue_count--;
                        deallocate_sdma_queue(dqm, q);
                }

                if (q->properties.is_active)
                        dqm->queue_count--;

                dqm->total_queue_count--;
        }

        /* Unregister process */
        list_for_each_entry_safe(cur, next_dpn, &dqm->queues, list) {
                if (qpd == cur->qpd) {
                        list_del(&cur->list);
                        kfree(cur);
                        dqm->processes_count--;
                        found = true;
                        break;
                }
        }

        retval = execute_queues_cpsch(dqm, filter, 0);
        if ((!dqm->is_hws_hang) && (retval || qpd->reset_wavefronts)) {
                pr_warn("Resetting wave fronts (cpsch) on dev %p\n", dqm->dev);
                dbgdev_wave_reset_wavefronts(dqm->dev, qpd->pqm->process);
                qpd->reset_wavefronts = false;
        }

        dqm_unlock(dqm);

        /* Outside the DQM lock because under the DQM lock we can't do
         * reclaim or take other locks that others hold while reclaiming.
         */
        if (found)
                kfd_dec_compute_active(dqm->dev);

        /* Lastly, free mqd resources.
         * Do free_mqd() after dqm_unlock to avoid circular locking.
         */
        list_for_each_entry_safe(q, next, &qpd->queues_list, list) {
                mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
                                q->properties.type)];
                list_del(&q->list);
                qpd->queue_count--;
                mqd_mgr->free_mqd(mqd_mgr, q->mqd, q->mqd_mem_obj);
        }

        return retval;
}

static int init_mqd_managers(struct device_queue_manager *dqm)
{
        int i, j;
        struct mqd_manager *mqd_mgr;

        for (i = 0; i < KFD_MQD_TYPE_MAX; i++) {
                mqd_mgr = dqm->asic_ops.mqd_manager_init(i, dqm->dev);
                if (!mqd_mgr) {
                        pr_err("mqd manager [%d] initialization failed\n", i);
                        goto out_free;
                }
                dqm->mqd_mgrs[i] = mqd_mgr;
        }

        return 0;

out_free:
        for (j = 0; j < i; j++) {
                kfree(dqm->mqd_mgrs[j]);
                dqm->mqd_mgrs[j] = NULL;
        }

        return -ENOMEM;
}

/* Allocate one hiq mqd (HWS) and all SDMA mqd in a continuous trunk*/
static int allocate_hiq_sdma_mqd(struct device_queue_manager *dqm)
{
        int retval;
        struct kfd_dev *dev = dqm->dev;
        struct kfd_mem_obj *mem_obj = &dqm->hiq_sdma_mqd;
        uint32_t size = dqm->mqd_mgrs[KFD_MQD_TYPE_SDMA]->mqd_size *
                (dev->device_info->num_sdma_engines +
                dev->device_info->num_xgmi_sdma_engines) *
                dev->device_info->num_sdma_queues_per_engine +
                dqm->mqd_mgrs[KFD_MQD_TYPE_HIQ]->mqd_size;

        retval = amdgpu_amdkfd_alloc_gtt_mem(dev->kgd, size,
                &(mem_obj->gtt_mem), &(mem_obj->gpu_addr),
                (void *)&(mem_obj->cpu_ptr), true);

        return retval;
}

struct device_queue_manager *device_queue_manager_init(struct kfd_dev *dev)
{
        struct device_queue_manager *dqm;

        pr_debug("Loading device queue manager\n");

        dqm = kzalloc(sizeof(*dqm), GFP_KERNEL);
        if (!dqm)
                return NULL;

        switch (dev->device_info->asic_family) {
        /* HWS is not available on Hawaii. */
        case CHIP_HAWAII:
        /* HWS depends on CWSR for timely dequeue. CWSR is not
         * available on Tonga.
         *
         * FIXME: This argument also applies to Kaveri.
         */
        case CHIP_TONGA:
                dqm->sched_policy = KFD_SCHED_POLICY_NO_HWS;
                break;
        default:
                dqm->sched_policy = sched_policy;
                break;
        }

        dqm->dev = dev;
        switch (dqm->sched_policy) {
        case KFD_SCHED_POLICY_HWS:
        case KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION:
                /* initialize dqm for cp scheduling */
                dqm->ops.create_queue = create_queue_cpsch;
                dqm->ops.initialize = initialize_cpsch;
                dqm->ops.start = start_cpsch;
                dqm->ops.stop = stop_cpsch;
                dqm->ops.pre_reset = pre_reset;
                dqm->ops.destroy_queue = destroy_queue_cpsch;
                dqm->ops.update_queue = update_queue;
                dqm->ops.register_process = register_process;
                dqm->ops.unregister_process = unregister_process;
                dqm->ops.uninitialize = uninitialize;
                dqm->ops.create_kernel_queue = create_kernel_queue_cpsch;
                dqm->ops.destroy_kernel_queue = destroy_kernel_queue_cpsch;
                dqm->ops.set_cache_memory_policy = set_cache_memory_policy;
                dqm->ops.set_trap_handler = set_trap_handler;
                dqm->ops.process_termination = process_termination_cpsch;
                dqm->ops.evict_process_queues = evict_process_queues_cpsch;
                dqm->ops.restore_process_queues = restore_process_queues_cpsch;
                dqm->ops.get_wave_state = get_wave_state;
                break;
        case KFD_SCHED_POLICY_NO_HWS:
                /* initialize dqm for no cp scheduling */
                dqm->ops.start = start_nocpsch;
                dqm->ops.stop = stop_nocpsch;
                dqm->ops.pre_reset = pre_reset;
                dqm->ops.create_queue = create_queue_nocpsch;
                dqm->ops.destroy_queue = destroy_queue_nocpsch;
                dqm->ops.update_queue = update_queue;
                dqm->ops.register_process = register_process;
                dqm->ops.unregister_process = unregister_process;
                dqm->ops.initialize = initialize_nocpsch;
                dqm->ops.uninitialize = uninitialize;
                dqm->ops.set_cache_memory_policy = set_cache_memory_policy;
                dqm->ops.set_trap_handler = set_trap_handler;
                dqm->ops.process_termination = process_termination_nocpsch;
                dqm->ops.evict_process_queues = evict_process_queues_nocpsch;
                dqm->ops.restore_process_queues =
                        restore_process_queues_nocpsch;
                dqm->ops.get_wave_state = get_wave_state;
                break;
        default:
                pr_err("Invalid scheduling policy %d\n", dqm->sched_policy);
                goto out_free;
        }

        switch (dev->device_info->asic_family) {
        case CHIP_CARRIZO:
                device_queue_manager_init_vi(&dqm->asic_ops);
                break;

        case CHIP_KAVERI:
                device_queue_manager_init_cik(&dqm->asic_ops);
                break;

        case CHIP_HAWAII:
                device_queue_manager_init_cik_hawaii(&dqm->asic_ops);
                break;

        case CHIP_TONGA:
        case CHIP_FIJI:
        case CHIP_POLARIS10:
        case CHIP_POLARIS11:
        case CHIP_POLARIS12:
        case CHIP_VEGAM:
                device_queue_manager_init_vi_tonga(&dqm->asic_ops);
                break;

        case CHIP_VEGA10:
        case CHIP_VEGA12:
        case CHIP_VEGA20:
        case CHIP_RAVEN:
        case CHIP_RENOIR:
        case CHIP_ARCTURUS:
                device_queue_manager_init_v9(&dqm->asic_ops);
                break;
        case CHIP_NAVI10:
        case CHIP_NAVI12:
        case CHIP_NAVI14:
                device_queue_manager_init_v10_navi10(&dqm->asic_ops);
                break;
        default:
                WARN(1, "Unexpected ASIC family %u",
                     dev->device_info->asic_family);
                goto out_free;
        }

        if (init_mqd_managers(dqm))
                goto out_free;

        if (allocate_hiq_sdma_mqd(dqm)) {
                pr_err("Failed to allocate hiq sdma mqd trunk buffer\n");
                goto out_free;
        }

        if (!dqm->ops.initialize(dqm))
                return dqm;

out_free:
        kfree(dqm);
        return NULL;
}

static void deallocate_hiq_sdma_mqd(struct kfd_dev *dev,
                                    struct kfd_mem_obj *mqd)
{
        WARN(!mqd, "No hiq sdma mqd trunk to free");

        amdgpu_amdkfd_free_gtt_mem(dev->kgd, mqd->gtt_mem);
}

void device_queue_manager_uninit(struct device_queue_manager *dqm)
{
        dqm->ops.uninitialize(dqm);
        deallocate_hiq_sdma_mqd(dqm->dev, &dqm->hiq_sdma_mqd);
        kfree(dqm);
}

int kfd_process_vm_fault(struct device_queue_manager *dqm,
                         unsigned int pasid)
{
        struct kfd_process_device *pdd;
        struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
        int ret = 0;

        if (!p)
                return -EINVAL;
        pdd = kfd_get_process_device_data(dqm->dev, p);
        if (pdd)
                ret = dqm->ops.evict_process_queues(dqm, &pdd->qpd);
        kfd_unref_process(p);

        return ret;
}

static void kfd_process_hw_exception(struct work_struct *work)
{
        struct device_queue_manager *dqm = container_of(work,
                        struct device_queue_manager, hw_exception_work);
        amdgpu_amdkfd_gpu_reset(dqm->dev->kgd);
}

#if defined(CONFIG_DEBUG_FS)

static void seq_reg_dump(struct seq_file *m,
                         uint32_t (*dump)[2], uint32_t n_regs)
{
        uint32_t i, count;

        for (i = 0, count = 0; i < n_regs; i++) {
                if (count == 0 ||
                    dump[i-1][0] + sizeof(uint32_t) != dump[i][0]) {
                        seq_printf(m, "%s    %08x: %08x",
                                   i ? "\n" : "",
                                   dump[i][0], dump[i][1]);
                        count = 7;
                } else {
                        seq_printf(m, " %08x", dump[i][1]);
                        count--;
                }
        }

        seq_puts(m, "\n");
}

int dqm_debugfs_hqds(struct seq_file *m, void *data)
{
        struct device_queue_manager *dqm = data;
        uint32_t (*dump)[2], n_regs;
        int pipe, queue;
        int r = 0;

        if (!dqm->sched_running) {
                seq_printf(m, " Device is stopped\n");

                return 0;
        }

        r = dqm->dev->kfd2kgd->hqd_dump(dqm->dev->kgd,
                                        KFD_CIK_HIQ_PIPE, KFD_CIK_HIQ_QUEUE,
                                        &dump, &n_regs);
        if (!r) {
                seq_printf(m, "  HIQ on MEC %d Pipe %d Queue %d\n",
                           KFD_CIK_HIQ_PIPE/get_pipes_per_mec(dqm)+1,
                           KFD_CIK_HIQ_PIPE%get_pipes_per_mec(dqm),
                           KFD_CIK_HIQ_QUEUE);
                seq_reg_dump(m, dump, n_regs);

                kfree(dump);
        }

        for (pipe = 0; pipe < get_pipes_per_mec(dqm); pipe++) {
                int pipe_offset = pipe * get_queues_per_pipe(dqm);

                for (queue = 0; queue < get_queues_per_pipe(dqm); queue++) {
                        if (!test_bit(pipe_offset + queue,
                                      dqm->dev->shared_resources.queue_bitmap))
                                continue;

                        r = dqm->dev->kfd2kgd->hqd_dump(
                                dqm->dev->kgd, pipe, queue, &dump, &n_regs);
                        if (r)
                                break;

                        seq_printf(m, "  CP Pipe %d, Queue %d\n",
                                  pipe, queue);
                        seq_reg_dump(m, dump, n_regs);

                        kfree(dump);
                }
        }

        for (pipe = 0; pipe < get_num_sdma_engines(dqm) +
                        get_num_xgmi_sdma_engines(dqm); pipe++) {
                for (queue = 0;

                     queue < dqm->dev->device_info->num_sdma_queues_per_engine;
                     queue++) {
                        r = dqm->dev->kfd2kgd->hqd_sdma_dump(
                                dqm->dev->kgd, pipe, queue, &dump, &n_regs);
                        if (r)
                                break;

                        seq_printf(m, "  SDMA Engine %d, RLC %d\n",
                                  pipe, queue);
                        seq_reg_dump(m, dump, n_regs);

                        kfree(dump);
                }
        }

        return r;
}

int dqm_debugfs_execute_queues(struct device_queue_manager *dqm)
{
        int r = 0;

        dqm_lock(dqm);
        dqm->active_runlist = true;
        r = execute_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0);
        dqm_unlock(dqm);

        return r;
}

#endif