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/*
* Copyright 2012 Shinpei Kato
*
* University of California, Santa Cruz
* Systems Research Lab.
*
* All Rights Reserved.
*
* 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 (including the next
* paragraph) 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
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
*/

#ifndef __GDEV_SCHED_H__
#define __GDEV_SCHED_H__

#include "gdev_device.h"
#include "gdev_time.h"

/**
* Queueing methods:
* SDQ: Single Device Queue
* MRQ: Multiple Resource Queues
*/
#define GDEV_SCHED_SDQ /*GDEV_SCHED_MRQ */

/**
* priority levels.
*/
#define GDEV_PRIO_MAX 40
#define GDEV_PRIO_MIN 0
#define GDEV_PRIO_DEFAULT 20

/**
* virtual device period/threshold.
*/
#define GDEV_PERIOD_DEFAULT 30000 /* microseconds */
#define GDEV_CREDIT_INACTIVE_THRESHOLD GDEV_PERIOD_DEFAULT
#define GDEV_UPDATE_INTERVAL 1000000

/**
* scheduling properties.
*/
#define GDEV_INSTANCES_LIMIT 32

struct gdev_sched_entity {
struct gdev_device *gdev; /* associated Gdev (virtual) device */
void *task; /* private task structure */
gdev_ctx_t *ctx; /* holder context */
int prio; /* general priority */
int rt_prio; /* real-time priority */
struct gdev_list list_entry_com; /* entry to compute scheduler list */
struct gdev_list list_entry_mem; /* entry to memory scheduler list */
struct gdev_time last_tick_com; /* last tick of compute execution */
struct gdev_time last_tick_mem; /* last tick of memory transfer */
int launch_instances;
int memcpy_instances;
};

struct gdev_vsched_policy {
void (*schedule_compute)(struct gdev_sched_entity *se);
struct gdev_device *(*select_next_compute)(struct gdev_device *gdev);
void (*replenish_compute)(struct gdev_device *gdev);
void (*schedule_memory)(struct gdev_sched_entity *se);
struct gdev_device *(*select_next_memory)(struct gdev_device *gdev);
void (*replenish_memory)(struct gdev_device *gdev);
};

int gdev_init_scheduler(struct gdev_device *gdev);
void gdev_exit_scheduler(struct gdev_device *gdev);

struct gdev_sched_entity *gdev_sched_entity_create(struct gdev_device *gdev, gdev_ctx_t *ctx);
void gdev_sched_entity_destroy(struct gdev_sched_entity *se);

void gdev_schedule_compute(struct gdev_sched_entity *se);
void gdev_select_next_compute(struct gdev_device *gdev);
void gdev_schedule_memory(struct gdev_sched_entity *se);
void gdev_select_next_memory(struct gdev_device *gdev);
void gdev_replenish_credit_compute(struct gdev_device *gdev);
void gdev_replenish_credit_memory(struct gdev_device *gdev);

extern struct gdev_sched_entity *sched_entity_ptr[GDEV_CONTEXT_MAX_COUNT];
extern gdev_lock_t global_sched_lock;

#endif
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