/*****************************************************************************\
 *  gres.h - driver for gres plugin
 *****************************************************************************
 *  Copyright (C) 2010 Lawrence Livermore National Security.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Morris Jette <jette1@llnl.gov>
 *  CODE-OCEC-09-009. All rights reserved.
 *
 *  This file is part of Slurm, a resource management program.
 *  For details, see <https://slurm.schedmd.com/>.
 *  Please also read the included file: DISCLAIMER.
 *
 *  Slurm is free software; you can redistribute it and/or modify it under
 *  the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  In addition, as a special exception, the copyright holders give permission
 *  to link the code of portions of this program with the OpenSSL library under
 *  certain conditions as described in each individual source file, and
 *  distribute linked combinations including the two. You must obey the GNU
 *  General Public License in all respects for all of the code used other than
 *  OpenSSL. If you modify file(s) with this exception, you may extend this
 *  exception to your version of the file(s), but you are not obligated to do
 *  so. If you do not wish to do so, delete this exception statement from your
 *  version.  If you delete this exception statement from all source files in
 *  the program, then also delete it here.
 *
 *  Slurm is distributed in the hope that it will be useful, but WITHOUT ANY
 *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 *  details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with Slurm; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
\*****************************************************************************/

#ifndef _GRES_H
#define _GRES_H

#include "slurm/slurm.h"
#include "slurm/slurmdb.h"
#include "src/common/bitstring.h"
#include "src/common/pack.h"

#define GRES_MAGIC 0x438a34d4
#define GRES_MAX_LINK 1023

enum {
	GRES_VAL_TYPE_FOUND  = 0,
	GRES_VAL_TYPE_CONFIG = 1,
	GRES_VAL_TYPE_AVAIL  = 2,
	GRES_VAL_TYPE_ALLOC  = 3
};

typedef struct {
	int alloc;
	int dev_num;
	char *major;
	char *path;
} gres_device_t;

/* Gres state information gathered by slurmd daemon */
typedef struct gres_slurmd_conf {
	/* Count of gres available in this configuration record */
	uint64_t count;

	/* Specific CPUs associated with this configuration record */
	uint32_t cpu_cnt;
	char *cpus;
	bitstr_t *cpus_bitmap;	/* Using LOCAL mapping */

	/* Device file associated with this configuration record */
	char *file;
	uint8_t has_file;	/* non-zero if file is set, flag for RPC */

	/* Comma-separated list of communication link IDs (numbers) */
	char *links;

	/* Name of this gres */
	char *name;

	/* Type of this gres (e.g. model name) */
	char *type_name;

	/* Gres ID number */
	uint32_t plugin_id;
} gres_slurmd_conf_t;

/* Current GRES state information managed by slurmctld daemon */
typedef struct gres_node_state {
	/* Actual hardware found */
	uint64_t gres_cnt_found;

	/* Configured resources via "Gres" parameter */
	uint64_t gres_cnt_config;

	/* Non-consumable: Do not track resources allocated to jobs */
	bool no_consume;

	/* True if set by node_feature plugin, ignore info from compute node */
	bool node_feature;

	/*
	 * Total resources available for allocation to jobs.
	 * gres_cnt_found or gres_cnt_config, depending upon FastSchedule
	 */
	uint64_t gres_cnt_avail;

	/* List of GRES in current use. Set NULL if needs to be rebuilt. */
	char *gres_used;

	/* Resources currently allocated to jobs */
	uint64_t  gres_cnt_alloc;
	bitstr_t *gres_bit_alloc;	/* If gres.conf contains File field */

	/* Topology specific information */
	uint16_t topo_cnt;		/* Size of topo_ arrays */
	bitstr_t **links_bitmap;
	bitstr_t **topo_core_bitmap;
	bitstr_t **topo_gres_bitmap;
	uint64_t *topo_gres_cnt_alloc;
	uint64_t *topo_gres_cnt_avail;
	uint32_t *topo_type_id;		/* GRES type (e.g. model ID) */
	char **topo_type_name;		/* GRES type (e.g. model name) */

	/* GRES type specific information (if gres.conf contains type option) */
	uint16_t type_cnt;		/* Size of type_ arrays */
	uint64_t *type_cnt_alloc;
	uint64_t *type_cnt_avail;
	uint32_t *type_id;		/* GRES type (e.g. model ID) */
	char **type_name;		/* GRES type (e.g. model name) */
} gres_node_state_t;

/* Gres job state as used by slurmctld daemon */
typedef struct gres_job_state {
	char *gres_name;		/* GRES name (e.g. "gpu") */
	uint32_t type_id;		/* GRES type (e.g. model ID) */
	char *type_name;		/* GRES type (e.g. model name) */

	/* Count of required GRES resources plus associated CPUs and memory */
	uint16_t cpus_per_gres;
	uint64_t gres_per_job;
	uint64_t gres_per_node;
	uint64_t gres_per_socket;
	uint64_t gres_per_task;
	uint64_t mem_per_gres;

	/*
	 * Default GRES configuration parameters. These values are subject to
	 * change depending upon which partition the job is currently being
	 * considered for scheduling in.
	 */
	uint16_t def_cpus_per_gres;
	uint64_t def_mem_per_gres;

	/* Allocated resources details */
	uint64_t total_gres;		/* allocated GRES for this job */
	uint64_t *gres_cnt_node_alloc;	/* Per node GRES allocated,
					 * Used without GRES files */
	uint32_t node_cnt;		/* 0 if no_consume */
	bitstr_t **gres_bit_alloc;

	/*
	 * Resources currently allocated to job steps on each node.
	 * This will be a subset of resources allocated to the job.
	 * gres_bit_step_alloc is a subset of gres_bit_alloc
	 */
	bitstr_t **gres_bit_step_alloc;
	uint64_t  *gres_cnt_step_alloc;
} gres_job_state_t;

/* Gres job step state as used by slurmctld daemon */
typedef struct gres_step_state {
	uint32_t type_id;		/* GRES type (e.g. model ID) */
	char *type_name;		/* GRES type (e.g. model name) */

	/* Count of required GRES resources plus associated CPUs and memory */
	uint16_t cpus_per_gres;
	uint64_t gres_per_step;
	uint64_t gres_per_node;
	uint64_t gres_per_socket;
	uint64_t gres_per_task;
	uint64_t mem_per_gres;

	/*
	 * Allocated resources details
	 *
	 * NOTE: node_cnt and the size of node_in_use and gres_bit_alloc are
	 * identical to that of the job for simplicity. Bits in node_in_use
	 * are set for those node of the job that are used by this step and
	 * gres_bit_alloc are also set if the job's gres_bit_alloc is set
	 */
	uint64_t total_gres;		/* allocated GRES for this step */
	uint64_t *gres_cnt_node_alloc;	/* Per node GRES allocated,
					 * Used without GRES files */
	uint32_t node_cnt;
	bitstr_t *node_in_use;
	bitstr_t **gres_bit_alloc;	/* Used with GRES files */
} gres_step_state_t;

/* Per-socket GRES availability information for scheduling purposes */
typedef struct sock_gres {	/* GRES availability by socket */
	uint64_t cnt_any_sock;	/* GRES count unconstrained by cores */
	uint64_t *cnt_by_sock;	/* Per-socket GRES count of this name & type */
	char *gres_name;	/* GRES name */
	gres_job_state_t *job_specs;	/* Pointer to job info, for limits */
	uint64_t max_gres;	/* Maximum GRES permitted on this node based
				 * upon mem_per_gres, 0 if no limit */
	uint32_t plugin_id;	/* Plugin ID (for quick search) */
	uint64_t total_cnt;	/* Total GRES count of this name & type */
	uint32_t type_id;	/* GRES type (e.g. model ID) */
	char *type_name;	/* GRES type (e.g. model name) */
} sock_gres_t;

typedef enum {
	GRES_STATE_TYPE_NODE = 0,
	GRES_STATE_TYPE_JOB,
	GRES_STATE_TYPE_STEP
} gres_state_type_enum_t;

/*
 * Initialize the GRES plugins.
 *
 * Returns a Slurm errno.
 */
extern int gres_plugin_init(void);

/*
 * Terminate the GRES plugins. Free memory.
 *
 * Returns a Slurm errno.
 */
extern int gres_plugin_fini(void);

/*
 **************************************************************************
 *                          P L U G I N   C A L L S                       *
 **************************************************************************
 */

/*
 * Perform reconfig, re-read any configuration files
 * OUT did_change - set if gres configuration changed
 */
extern int gres_plugin_reconfig(bool *did_change);

/*
 * Provide a plugin-specific help message for salloc, sbatch and srun
 * IN/OUT msg - buffer provided by caller and filled in by plugin
 * IN msg_size - size of msg buffer in bytes
 */
extern int gres_plugin_help_msg(char *msg, int msg_size);

/*
 **************************************************************************
 *                 PLUGIN CALLS FOR SLURMD DAEMOtN                         *
 **************************************************************************
 */
/*
 * Load this node's configuration (how many resources it has, topology, etc.)
 * IN cpu_cnt - Number of CPUs on configured on this node
 * IN node_name - Name of this node
 * IN xcpuinfo_abs_to_mac - Pointer to xcpuinfo_abs_to_mac() funct, if available
 */
extern int gres_plugin_node_config_load(uint32_t cpu_cnt, char *node_name,
					void *xcpuinfo_abs_to_mac);

/*
 * Pack this node's gres configuration into a buffer
 * IN/OUT buffer - message buffer to pack
 */
extern int gres_plugin_node_config_pack(Buf buffer);

/*
 * Set GRES devices as allocated or not for a particular job
 * IN gres_list - allocated gres devices
 * IN is_job - if is job function expects gres_job_state_t's else
 *             gres_step_state_t's
 * RET - List of gres_device_t containing all devices from all GRES with alloc
 *       set correctly if the device is allocated to the job/step.
 */
extern List gres_plugin_get_allocated_devices(List gres_list, bool is_job);

/* Send GRES information to slurmstepd on the specified file descriptor */
extern void gres_plugin_send_stepd(int fd);

/* Receive GRES information from slurmd on the specified file descriptor */
extern void gres_plugin_recv_stepd(int fd);

/*
 **************************************************************************
 *                 PLUGIN CALLS FOR SLURMCTLD DAEMON                      *
 **************************************************************************
 */
/*
 * Build a node's gres record based only upon the slurm.conf contents
 * IN node_name - name of the node for which the gres information applies
 * IN orig_config - Gres information supplied from slurm.conf
 * IN/OUT gres_list - List of Gres records for this node to track usage
 */
extern int gres_plugin_init_node_config(char *node_name, char *orig_config,
					List *gres_list);

/* Add a GRES record. This is used by the node_features plugin after the
 * slurm.conf file is read and the initial GRES records are built by
 * gres_plugin_init(). */
extern void gres_plugin_add(char *gres_name);

/*
 * Unpack this node's configuration from a buffer (built/packed by slurmd)
 * IN/OUT buffer - message buffer to unpack
 * IN node_name - name of node whose data is being unpacked
 */
extern int gres_plugin_node_config_unpack(Buf buffer, char *node_name);

/*
 * Validate a node's configuration and put a gres record onto a list
 *	(expected to be an element of slurmctld's node record).
 * Called immediately after gres_plugin_node_config_unpack().
 * IN node_name - name of the node for which the gres information applies
 * IN orig_config - Gres information supplied from slurm.conf
 * IN/OUT new_config - Gres information from slurm.conf if FastSchedule=0
 * IN/OUT gres_list - List of Gres records for this node to track usage
 * IN fast_schedule - 0: Validate and use actual hardware configuration
 *		      1: Validate hardware config, but use slurm.conf config
 *		      2: Don't validate hardware, use slurm.conf configuration
 * OUT reason_down - set to an explanation of failure, if any, don't set if NULL
 */
extern int gres_plugin_node_config_validate(char *node_name,
					    char *orig_config,
					    char **new_config,
					    List *gres_list,
					    uint16_t fast_schedule,
					    char **reason_down);

/*
 * Add a GRES from node_feature plugin
 * IN node_name - name of the node for which the gres information applies
 * IN gres_name - name of the GRES being added or updated from the plugin
 * IN gres_size - count of this GRES on this node
 * IN/OUT new_config - Updated GRES info from slurm.conf
 * IN/OUT gres_list - List of GRES records for this node to track usage
 */
extern void gres_plugin_node_feature(char *node_name,
				     char *gres_name, uint64_t gres_size,
				     char **new_config, List *gres_list);

/*
 * Note that a node's configuration has been modified (e.g. "scontol update ..")
 * IN node_name - name of the node for which the gres information applies
 * IN orig_config - Gres information supplied from slurm.conf
 * IN/OUT new_config - Updated gres info from slurm.conf if FastSchedule=0
 * IN/OUT gres_list - List of Gres records for this node to track usage
 * IN fast_schedule - 0: Validate and use actual hardware configuration
 *		      1: Validate hardware config, but use slurm.conf config
 *		      2: Don't validate hardware, use slurm.conf configuration
 */
extern int gres_plugin_node_reconfig(char *node_name,
				     char *orig_config,
				     char **new_config,
				     List *gres_list,
				     uint16_t fast_schedule);

/*
 * Pack a node's current gres status, called from slurmctld for save/restore
 * IN gres_list - generated by gres_plugin_node_config_validate()
 * IN/OUT buffer - location to write state to
 * IN node_name - name of the node for which the gres information applies
 */
extern int gres_plugin_node_state_pack(List gres_list, Buf buffer,
				       char *node_name);
/*
 * Unpack a node's current gres status, called from slurmctld for save/restore
 * OUT gres_list - restored state stored by gres_plugin_node_state_pack()
 * IN/OUT buffer - location to read state from
 * IN node_name - name of the node for which the gres information applies
 */
extern int gres_plugin_node_state_unpack(List *gres_list, Buf buffer,
					 char *node_name,
					 uint16_t protocol_version);

/*
 * Duplicate a node gres status (used for will-run logic)
 * IN gres_list - node gres state information
 * RET a copy of gres_list or NULL on failure
 */
extern List gres_plugin_node_state_dup(List gres_list);

/*
 * Deallocate all resources on this node previous allocated to any jobs.
 *	This function isused to synchronize state after slurmctld restarts or
 *	is reconfigured.
 * IN gres_list - node gres state information
 */
extern void gres_plugin_node_state_dealloc_all(List gres_list);

/*
 * Log a node's current gres state
 * IN gres_list - generated by gres_plugin_node_config_validate()
 * IN node_name - name of the node for which the gres information applies
 */
extern void gres_plugin_node_state_log(List gres_list, char *node_name);

/*
 * Build a string indicating a node's drained GRES
 * IN gres_list - generated by gres_plugin_node_config_validate()
 * RET - string, must be xfreed by caller
 */
extern char *gres_get_node_drain(List gres_list);

/*
 * Build a string indicating a node's used GRES
 * IN gres_list - generated by gres_plugin_node_config_validate()
 * RET - string, must be xfreed by caller
 */
extern char *gres_get_node_used(List gres_list);

/*
 * Give the total system count of a given gres
 */
extern uint64_t gres_get_system_cnt(char *name);

/*
 * Get the count of a node's GRES
 * IN gres_list - List of Gres records for this node to track usage
 * IN name - name of gres
 */
extern uint64_t gres_plugin_node_config_cnt(List gres_list, char *name);

/*
 * Fill in an array of GRES type ids contained within the given node gres_list
 *		and an array of corresponding counts of those GRES types.
 * IN gres_list - a List of GRES types found on a node.
 * IN arr_len - Length of the arrays (the number of elements in the gres_list).
 * IN gres_count_ids, gres_count_vals - the GRES type ID's and values found
 *	 	in the gres_list.
 * IN val_type - Type of value desired, see GRES_VAL_TYPE_*
 * RET SLURM_SUCCESS or error code
 */
extern int gres_plugin_node_count(List gres_list, int arr_len,
				  int *gres_count_ids, int *gres_count_vals,
				  int val_type);

/*
 * Fill in an array of GRES type ids contained within the given job gres_list
 *		and an array of corresponding counts of those GRES types.
 * IN gres_list - a List of GRES types allocated to a job.
 * IN arr_len - Length of the arrays (the number of elements in the gres_list).
 * IN gres_count_ids, gres_count_vals - the GRES type ID's and values found
 *	 	in the gres_list.
 * RET SLURM_SUCCESS or error code
 */
extern int gres_plugin_job_count(List gres_list, int arr_len,
				 uint32_t *gres_count_ids,
				 uint64_t *gres_count_vals);

/*
 * Build a string identifying total GRES counts of each type
 * IN gres_list - a List of GRES types allocated to a job.
 * RET string containing comma-separated list of gres type:model:count
 *     must release memory using xfree()
 */
extern char *gres_plugin_job_alloc_count(List gres_list);

/*
 * Given a job's requested gres configuration, validate it and build a gres list
 * IN *tres* - job request's gres input string
 * IN num_tasks - requested task count
 * IN min_nodes - requested minimum node count
 * IN max_nodes - requested maximum node count
 * OUT gres_list - List of GRES records for this job to track usage
 * RET SLURM_SUCCESS or ESLURM_INVALID_GRES
 */
extern int gres_plugin_job_state_validate(char *cpus_per_tres,
					  char *tres_per_job,
					  char *tres_per_node,
					  char *tres_per_socket,
					  char *tres_per_task,
					  char *mem_per_tres,
					  uint32_t num_tasks,
					  uint32_t min_nodes,
					  uint32_t max_nodes,
					  List *gres_list);

/*
 * Create a (partial) copy of a job's gres state for job binding
 * IN gres_list - List of Gres records for this job to track usage
 * RET The copy or NULL on failure
 * NOTE: Only gres_cnt_alloc, node_cnt and gres_bit_alloc are copied
 *	 Job step details are NOT copied.
 */
List gres_plugin_job_state_dup(List gres_list);

/*
 * Create a (partial) copy of a job's gres state for a particular node index
 * IN gres_list - List of Gres records for this job to track usage
 * IN node_index - zero-origin index to the node
 * RET The copy or NULL on failure
 */
List gres_plugin_job_state_extract(List gres_list, int node_index);

/*
 * Pack a job's current gres status, called from slurmctld for save/restore
 * IN gres_list - generated by gres_plugin_job_config_validate()
 * IN/OUT buffer - location to write state to
 * IN job_id - job's ID
 * IN details - if set then pack job step allocation details (only needed to
 *	 	save/restore job state, not needed in job credential for
 *		slurmd task binding)
 *
 * NOTE: A job's allocation to steps is not recorded here, but recovered with
 *	 the job step state information upon slurmctld restart.
 */
extern int gres_plugin_job_state_pack(List gres_list, Buf buffer,
				      uint32_t job_id, bool details,
				      uint16_t protocol_version);

/*
 * Unpack a job's current gres status, called from slurmctld for save/restore
 * OUT gres_list - restored state stored by gres_plugin_job_state_pack()
 * IN/OUT buffer - location to read state from
 * IN job_id - job's ID
 */
extern int gres_plugin_job_state_unpack(List *gres_list, Buf buffer,
					uint32_t job_id,
					uint16_t protocol_version);

/*
 * Clear the core_bitmap for cores which are not usable by this job (i.e. for
 *	cores which are already bound to other jobs or lack GRES)
 * IN job_gres_list   - job's gres_list built by gres_plugin_job_state_validate()
 * IN node_gres_list  - node's gres_list built by
 *                      gres_plugin_node_config_validate()
 * IN use_total_gres  - if set then consider all GRES resources as available,
 *		        and none are commited to running jobs
 * IN/OUT core_bitmap - Identification of available cores (NULL if no restriction)
 * IN core_start_bit  - index into core_bitmap for this node's first cores
 * IN core_end_bit    - index into core_bitmap for this node's last cores
 */
extern void gres_plugin_job_core_filter(List job_gres_list, List node_gres_list,
					bool use_total_gres,
					bitstr_t *core_bitmap,
					int core_start_bit, int core_end_bit,
					char *node_name);

/*
 * Determine how many cores on the node can be used by this job
 * IN job_gres_list  - job's gres_list built by gres_plugin_job_state_validate()
 * IN node_gres_list - node's gres_list built by gres_plugin_node_config_validate()
 * IN use_total_gres - if set then consider all gres resources as available,
 *		       and none are commited to running jobs
 * IN core_bitmap    - Identification of available cores (NULL if no restriction)
 * IN core_start_bit - index into core_bitmap for this node's first core
 * IN core_end_bit   - index into core_bitmap for this node's last core
 * IN job_id         - job's ID (for logging)
 * IN node_name      - name of the node (for logging)
 * RET: NO_VAL    - All cores on node are available
 *      otherwise - Count of available cores
 */
extern uint32_t gres_plugin_job_test(List job_gres_list, List node_gres_list,
				     bool use_total_gres, bitstr_t *core_bitmap,
				     int core_start_bit, int core_end_bit,
				     uint32_t job_id, char *node_name);

/*
 * Determine how many cores on each socket of a node can be used by this job
 * IN job_gres_list   - job's gres_list built by gres_plugin_job_state_validate()
 * IN node_gres_list  - node's gres_list built by gres_plugin_node_config_validate()
 * IN use_total_gres  - if set then consider all gres resources as available,
 *		        and none are commited to running jobs
 * IN/OUT core_bitmap - Identification of available cores on this node
 * IN sockets         - Count of sockets on the node
 * IN cores_per_sock  - Count of cores per socket on this node
 * IN job_id          - job's ID (for logging)
 * IN node_name       - name of the node (for logging)
 * IN enforce_binding - if true then only use GRES with direct access to cores
 * IN s_p_n           - Expected sockets_per_node (NO_VAL if not limited)
 * RET: List of sock_gres_t entries identifying what resources are available on
 *	each core. Returns NULL if none available. Call FREE_NULL_LIST() to
 *	release memory.
 */
extern List gres_plugin_job_test2(List job_gres_list, List node_gres_list,
				  bool use_total_gres, bitstr_t *core_bitmap,
				  uint16_t sockets, uint16_t cores_per_sock,
				  uint32_t job_id, char *node_name,
				  bool enforce_binding, uint32_t s_p_n);

/*
 * Determine how many GRES can be used on this node given the available cores
 * IN sock_gres_list  - list of sock_gres_t entries built by gres_plugin_job_test2()
 * IN avail_mem       - memory available for the job
 * IN enforce_binding - GRES must be co-allocated with cores
 * IN core_bitmap     - Identification of available cores on this node
 * IN sockets         - Count of sockets on the node
 * IN cores_per_sock  - Count of cores per socket on this node
 * IN cpus_per_core   - Count of CPUs per core on this node
 * RET - 0 if job can use this node, -1 otherwise (some GRES limit prevents use)
 */
extern int gres_plugin_job_core_filter2(List sock_gres_list, uint64_t avail_mem,
					bool enforce_binding,
					bitstr_t *core_bitmap,
					uint16_t sockets,
					uint16_t cores_per_sock,
					uint16_t cpus_per_core);

/*
 * Allocate resource to a job and update node and job gres information
 * IN job_gres_list - job's gres_list built by gres_plugin_job_state_validate()
 * IN node_gres_list - node's gres_list built by
 *		       gres_plugin_node_config_validate()
 * IN node_cnt    - total number of nodes originally allocated to the job
 * IN node_offset - zero-origin index to the node of interest
 * IN job_id      - job's ID (for logging)
 * IN node_name   - name of the node (for logging)
 * IN core_bitmap - cores allocated to this job on this node (NULL if not
 *                  available)
 * RET SLURM_SUCCESS or error code
 */
extern int gres_plugin_job_alloc(List job_gres_list, List node_gres_list,
				 int node_cnt, int node_offset,
				 uint32_t job_id, char *node_name,
				 bitstr_t *core_bitmap);

/* Clear any vestigial job gres state. This may be needed on job requeue. */
extern void gres_plugin_job_clear(List job_gres_list);

/*
 * Deallocate resource from a job and update node and job gres information
 * IN job_gres_list - job's gres_list built by gres_plugin_job_state_validate()
 * IN node_gres_list - node's gres_list built by
 *		gres_plugin_node_config_validate()
 * IN node_offset - zero-origin index to the node of interest
 * IN job_id      - job's ID (for logging)
 * IN node_name   - name of the node (for logging)
 * RET SLURM_SUCCESS or error code
 */
extern int gres_plugin_job_dealloc(List job_gres_list, List node_gres_list,
				   int node_offset, uint32_t job_id,
				   char *node_name);

/*
 * Merge one job's gres allocation into another job's gres allocation.
 * IN from_job_gres_list - List of gres records for the job being merged
 *			into another job
 * IN from_job_node_bitmap - bitmap of nodes for the job being merged into
 *			another job
 * IN/OUT to_job_gres_list - List of gres records for the job being merged
 *			into job
 * IN to_job_node_bitmap - bitmap of nodes for the job being merged into
 */
extern void gres_plugin_job_merge(List from_job_gres_list,
				  bitstr_t *from_job_node_bitmap,
				  List to_job_gres_list,
				  bitstr_t *to_job_node_bitmap);

/*
 * Set environment variables as required for a batch job
 * IN/OUT job_env_ptr - environment variable array
 * IN gres_list - generated by gres_plugin_job_alloc()
 * IN node_inx - zero origin node index
 */
extern void gres_plugin_job_set_env(char ***job_env_ptr, List job_gres_list,
				    int node_inx);

/*
 * Set job default parameters in a given element of a list
 * IN job_gres_list - job's gres_list built by gres_plugin_job_state_validate()
 * IN gres_name - name of gres, apply defaults to all elements (e.g. updates to
 *		  gres_name="gpu" would apply to "gpu:tesla", "gpu:volta", etc.)
 * IN cpu_per_gpu - value to set as default
 * IN mem_per_gpu - value to set as default
 */
extern void gres_plugin_job_set_defs(List job_gres_list, char *gres_name,
				     uint64_t cpu_per_gpu,
				     uint64_t mem_per_gpu);

/*
 * Extract from the job record's gres_list the count of allocated resources of
 * 	the named gres type.
 * IN job_gres_list  - job record's gres_list.
 * IN gres_name_type - the name of the gres type to retrieve the associated
 *	value from.
 * RET The value associated with the gres type or NO_VAL if not found.
 */
extern uint64_t gres_plugin_get_job_value_by_type(List job_gres_list,
						  char *gres_name_type);

/*
 * Log a job's current gres state
 * IN gres_list - generated by gres_plugin_job_state_validate()
 * IN job_id    - job's ID
 */
extern void gres_plugin_job_state_log(List gres_list, uint32_t job_id);

/*
 * Given a step's requested gres configuration, validate it and build gres list
 * IN *tres* - step's request's gres input string
 * OUT step_gres_list - List of Gres records for this step to track usage
 * IN job_gres_list - List of Gres records for this job
 * IN job_id, step_id - ID of the step being allocated.
 * RET SLURM_SUCCESS or ESLURM_INVALID_GRES
 */
extern int gres_plugin_step_state_validate(char *cpus_per_tres,
					   char *tres_per_step,
					   char *tres_per_node,
					   char *tres_per_socket,
					   char *tres_per_task,
					   char *mem_per_tres,
					   List *step_gres_list,
					   List job_gres_list, uint32_t job_id,
					   uint32_t step_id);

/*
 * Create a copy of a step's gres state
 * IN gres_list - List of Gres records for this step to track usage
 * RET The copy or NULL on failure
 */
List gres_plugin_step_state_dup(List gres_list);

/*
 * Create a copy of a step's gres state for a particular node index
 * IN gres_list - List of Gres records for this step to track usage
 * IN node_index - zero-origin index to the node
 * RET The copy or NULL on failure
 */
List gres_plugin_step_state_extract(List gres_list, int node_index);

/*
 * A job allocation size has changed. Update the job step gres information
 * bitmaps and other data structures.
 * IN gres_list - List of Gres records for this step to track usage
 * IN orig_job_node_bitmap - bitmap of nodes in the original job allocation
 * IN new_job_node_bitmap - bitmap of nodes in the new job allocation
 */
void gres_plugin_step_state_rebase(List gres_list,
				   bitstr_t *orig_job_node_bitmap,
				   bitstr_t *new_job_node_bitmap);

/*
 * Pack a step's current gres status, called from slurmctld for save/restore
 * IN gres_list - generated by gres_plugin_step_allocate()
 * IN/OUT buffer - location to write state to
 * IN job_id, step_id - job and step ID for logging
 */
extern int gres_plugin_step_state_pack(List gres_list, Buf buffer,
				       uint32_t job_id, uint32_t step_id,
				       uint16_t protocol_version);

/*
 * Unpack a step's current gres status, called from slurmctld for save/restore
 * OUT gres_list - restored state stored by gres_plugin_step_state_pack()
 * IN/OUT buffer - location to read state from
 * IN job_id, step_id - job and step ID for logging
 */
extern int gres_plugin_step_state_unpack(List *gres_list, Buf buffer,
					 uint32_t job_id, uint32_t step_id,
					 uint16_t protocol_version);

/* Return the count of GRES of a specific name on this machine
 * IN step_gres_list - generated by gres_plugin_step_allocate()
 * IN gres_name - name of the GRES to match
 * RET count of GRES of this specific name available to the job or NO_VAL64
 */
extern uint64_t gres_plugin_step_count(List step_gres_list, char *gres_name);

/*
 * Set environment variables as required for all tasks of a job step
 * IN/OUT job_env_ptr - environment variable array
 * IN step_gres_list - generated by gres_plugin_step_allocate()
 * IN accel_bind_type - GRES binding options
 */
extern void gres_plugin_step_set_env(char ***job_env_ptr, List step_gres_list,
				     uint16_t accel_bind_type);

/*
 * Log a step's current gres state
 * IN gres_list - generated by gres_plugin_step_allocate()
 * IN job_id - job's ID
 */
extern void gres_plugin_step_state_log(List gres_list, uint32_t job_id,
				       uint32_t step_id);

/*
 * Determine how many cores of a job's allocation can be allocated to a job
 *	on a specific node
 * IN job_gres_list - a running job's gres info
 * IN/OUT step_gres_list - a pending job step's gres requirements
 * IN node_offset - index into the job's node allocation
 * IN ignore_alloc - if set ignore resources already allocated to running steps
 * IN job_id, step_id - ID of the step being allocated.
 * RET Count of available cores on this node (sort of):
 *     NO_VAL64 if no limit or 0 if node is not usable
 */
extern uint64_t gres_plugin_step_test(List step_gres_list, List job_gres_list,
				      int node_offset, bool ignore_alloc,
				      uint32_t job_id, uint32_t step_id);

/*
 * Allocate resource to a step and update job and step gres information
 * IN step_gres_list - step's gres_list built by
 *		gres_plugin_step_state_validate()
 * IN job_gres_list - job's gres_list built by gres_plugin_job_state_validate()
 * IN node_offset - job's zero-origin index to the node of interest
 * IN job_id, step_id - ID of the step being allocated.
 * RET SLURM_SUCCESS or error code
 */
extern int gres_plugin_step_alloc(List step_gres_list, List job_gres_list,
				  int node_offset, uint32_t job_id,
				  uint32_t step_id);

/*
 * Deallocate resource to a step and update job and step gres information
 * IN step_gres_list - step's gres_list built by
 *		gres_plugin_step_state_validate()
 * IN job_gres_list - job's gres_list built by gres_plugin_job_state_validate()
 * IN job_id, step_id - ID of the step being allocated.
 * RET SLURM_SUCCESS or error code
 */
extern int gres_plugin_step_dealloc(List step_gres_list, List job_gres_list,
				    uint32_t job_id, uint32_t step_id);

/*
 * Build a string containing the GRES details for a given node and socket
 * sock_gres_list IN - List of sock_gres_t entries
 * sock_inx IN - zero-origin socket for which information is to be returned
 * RET string, must call xfree() to release memory
 */
extern char *gres_plugin_sock_str(List sock_gres_list, int sock_inx);

/*
 * Map a given GRES type ID back to a GRES type name.
 * gres_id IN - GRES type ID to search for.
 * gres_name IN - Pre-allocated string in which to store the GRES type name.
 * gres_name_len - Size of gres_name in bytes
 * RET - error code (currently not used--always return SLURM_SUCCESS)
 */
extern int gres_gresid_to_gresname(uint32_t gres_id, char* gres_name,
				   int gres_name_len);

/*
 * Determine total count GRES of a given type are allocated to a job across
 * all nodes
 * IN job_gres_list - job's gres_list built by gres_plugin_job_state_validate()
 * IN gres_name - name of a GRES type
 * RET count of this GRES allocated to this job
 */
extern uint64_t gres_get_value_by_type(List job_gres_list, char *gres_name);

enum gres_job_data_type {
	GRES_JOB_DATA_COUNT,	/* data-> uint64_t  */
	GRES_JOB_DATA_BITMAP,	/* data-> bitstr_t* */
};

/*
 * get data from a job's GRES data structure
 * IN job_gres_list  - job's GRES data structure
 * IN gres_name - name of a GRES type
 * IN node_inx - zero-origin index of the node within the job's allocation
 *	for which data is desired
 * IN data_type - type of data to get from the job's data
 * OUT data - pointer to the data from job's GRES data structure
 *            DO NOT FREE: This is a pointer into the job's data structure
 * RET - SLURM_SUCCESS or error code
 */
extern int gres_get_job_info(List job_gres_list, char *gres_name,
			     uint32_t node_inx,
			     enum gres_job_data_type data_type, void *data);

/* Given a job's GRES data structure, return the indecies for selected elements
 * IN job_gres_list  - job's GRES data structure
 * OUT gres_detail_cnt - Number of elements (nodes) in gres_detail_str
 * OUT gres_detail_str - Description of GRES on each node
 */
extern void gres_build_job_details(List job_gres_list,
				   uint32_t *gres_detail_cnt,
				   char ***gres_detail_str);

enum gres_step_data_type {
	GRES_STEP_DATA_COUNT,	/* data-> uint64_t  */
	GRES_STEP_DATA_BITMAP,	/* data-> bitstr_t* */
};

/*
 * get data from a step's GRES data structure
 * IN job_gres_list  - step's GRES data structure
 * IN gres_name - name of a GRES type
 * IN node_inx - zero-origin index of the node within the job's allocation
 *	for which data is desired. Note this can differ from the step's
 *	node allocation index.
 * IN data_type - type of data to get from the step's data
 * OUT data - pointer to the data from step's GRES data structure
 *            DO NOT FREE: This is a pointer into the step's data structure
 * RET - SLURM_SUCCESS or error code
 */
extern int gres_get_step_info(List step_gres_list, char *gres_name,
			      uint32_t node_inx,
			      enum gres_step_data_type data_type, void *data);

extern gres_job_state_t *gres_get_job_state(List gres_list, char *name);
extern gres_step_state_t *gres_get_step_state(List gres_list, char *name);

/* Translate a gres_list into a tres_str
 * IN gres_list - filled in with gres_job_state_t or gres_step_state_t's
 * IN is_job - if is job function expects gres_job_state_t's else
 *             gres_step_state_t's
 * IN locked - if the assoc_mgr tres read locked is locked or not
 * RET char * in a simple TRES format
 */
extern char *gres_2_tres_str(List gres_list, bool is_job, bool locked);

/* Fill in the job allocated tres_cnt based off the gres_list and node_cnt
 * IN gres_list - filled in with gres_job_state_t's
 * IN node_cnt - number of nodes in the job
 * OUT tres_cnt - gres spots filled in with total number of TRES
 *                requested for job that are requested in gres_list
 * IN locked - if the assoc_mgr tres read locked is locked or not
 */
extern void gres_set_job_tres_cnt(List gres_list,
				  uint32_t node_cnt,
				  uint64_t *tres_cnt,
				  bool locked);

/* Fill in the node allocated tres_cnt based off the gres_list
 * IN gres_list - filled in with gres_node_state_t's gres_alloc_cnt
 * OUT tres_cnt - gres spots filled in with total number of TRES
 *                allocated on node
 * IN locked - if the assoc_mgr tres read locked is locked or not
 */
extern void gres_set_node_tres_cnt(List gres_list, uint64_t *tres_cnt,
				   bool locked);

/* return the major info from a given path of a device */
extern char *gres_device_major(char *dev_path);

extern void destroy_gres_device(void *p);

#endif /* !_GRES_H */
