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source: trunk/kernel/kern/rpc.h @ 155

Last change on this file since 155 was 23, checked in by alain, 7 years ago
Introduce syscalls.
File size: 26.8 KB

Rev	Line
[1]	1	/*
	2	* rpc.h - RPC (Remote Procedure Call) operations definition.
	3	*
[23]	4	* Author Alain Greiner (2016,2017)
[1]	5	*
	6	* Copyright (c) UPMC Sorbonne Universites
	7	*
	8	* This file is part of ALMOS-MKH.
	9	*
	10	* ALMOS-MKH is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; version 2.0 of the License.
	13	*
	14	* ALMOS-MKH is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
	21	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	22	*/
	23
	24	#ifndef _RPC_H_
	25	#define _RPC_H_
	26
[14]	27	#include <kernel_config.h>
[1]	28	#include <hal_types.h>
	29	#include <hal_atomic.h>
	30	#include <bits.h>
	31	#include <spinlock.h>
	32	#include <remote_fifo.h>
	33
	34	/** Forward declarations **/
	35
	36	struct process_s;
	37	struct vseg_s;
	38	struct exec_info_s;
	39	struct pthread_attr_s;
	40	struct remote_sem_s;
	41	struct fragment_s;
	42	struct vfs_inode_s;
	43	struct vfs_dentry_s;
[23]	44	struct vfs_file_s;
[1]	45	struct thread_s;
	46	struct mapper_s;
	47
	48	/**********************************************************************************/
	49	/************ structures for Remote Procedure Calls **************************/
	50	/**********************************************************************************/
	51
	52	/***********************************************************************************
	53	* This enum defines all RPC indexes.
	54	* It must be consistent with the rpc_server[] array defined in in the rpc.c file.
	55	**********************************************************************************/
	56
	57	typedef enum
	58	{
	59	RPC_PMEM_GET_PAGES = 0,
	60	RPC_PROCESS_PID_ALLOC = 1,
	61	RPC_PROCESS_EXEC = 2,
	62	RPC_PROCESS_KILL = 3,
	63	RPC_THREAD_USER_CREATE = 4,
	64	RPC_THREAD_KERNEL_CREATE = 5,
[23]	65	RPC_SIGNAL_RISE = 6,
[1]	66
	67	RPC_VFS_INODE_CREATE = 10,
	68	RPC_VFS_INODE_DESTROY = 11,
	69	RPC_VFS_DENTRY_CREATE = 12,
	70	RPC_VFS_DENTRY_DESTROY = 13,
[23]	71	RPC_VFS_FILE_CREATE = 14,
	72	RPC_VFS_FILE_DESTROY = 15,
	73	RPC_FATFS_GET_CLUSTER = 16,
[1]	74
	75	RPC_VMM_GET_REF_VSEG = 20,
	76	RPC_VMM_GET_PTE = 21,
[23]	77	RPC_KCM_ALLOC = 22,
	78	RPC_KCM_FREE = 23,
[1]	79	RPC_MAPPER_MOVE = 24,
	80
[23]	81	RPC_MAX_INDEX = 30,
[1]	82	}
	83	rpc_index_t;
	84
	85	/***********************************************************************************
	86	* This defines the prototype of the rpc_server functions,
	87	* defined by the rpc_server[] array in the rpc.c file.
	88	**********************************************************************************/
	89
	90	typedef void (rpc_server_t) ( xptr_t xp );
	91
	92	/***********************************************************************************
	93	* This structure defines the RPC descriptor
	94	**********************************************************************************/
	95
	96	typedef struct rpc_desc_s
	97	{
	98	rpc_index_t index; // index of requested RPC service
	99	volatile uint32_t response; // response valid when 0
[23]	100	uint64_t args[10]; // input/output arguments buffer
[1]	101	}
	102	rpc_desc_t;
	103
	104	/***********************************************************************************
	105	* This structure defines the RPC fifo, containing a remote_fifo, the owner RPC
	106	* thread TRDID (used as a light lock), and the intrumentation counter.
	107	*
	108	* Implementation note: the TRDID is a good owner identifier, because all
	109	* RPC threads in a given cluster belong to the same process_zero kernel process,
	110	* and RPC threads cannot have local index LTID = 0.
	111	**********************************************************************************/
	112
	113	typedef struct rpc_fifo_s
	114	{
	115	trdid_t owner; // owner thread / 0 if no owner
	116	uint64_t count; // total number of received RPCs (instrumentation)
	117	remote_fifo_t fifo; // embedded remote fifo
	118	}
	119	rpc_fifo_t;
	120
	121
	122	/**********************************************************************************/
	123	/***** Generic functions supporting RPCs : client side ************************/
	124	/**********************************************************************************/
	125
	126	/***********************************************************************************
	127	* This blocking function executes on the client core.
	128	* It puts one RPC extended pointer in the remote fifo.
	129	* It sends an IPI if fifo is empty, and waits until RPC response available.
	130	* The RPC descriptor must be allocated in the caller's stack
	131	* and initialised by the caller. Exit with a Panic message if remote fifo
	132	* is still full after (CONFIG_RPC_PUT_MAX_ITERATIONS) retries.
	133	***********************************************************************************
	134	* @ cxy : server cluster identifier
	135	* @ desc : local pointer on RPC descriptor in client cluster
	136	**********************************************************************************/
	137	void rpc_send_sync( cxy_t cxy,
	138	rpc_desc_t * desc );
	139
	140
	141
	142	/**********************************************************************************/
	143	/***** Generic functions supporting RPCs : server side ************************/
	144	/**********************************************************************************/
	145
	146	/***********************************************************************************
	147	* This function initialises the local RPC fifo and the lock protecting readers.
	148	* The number of slots is defined by the CONFIG_REMOTE_FIFO_SLOTS parameter.
	149	* Each slot contains an extended pointer on the RPC descriptor.
	150	***********************************************************************************
	151	* @ rf : pointer on the local RPC fifo.
	152	**********************************************************************************/
	153	void rpc_fifo_init( rpc_fifo_t * rf );
	154
	155	/***********************************************************************************
	156	* This function is the entry point for RPC handling on the server side.
	157	* It can be executed by any thread running (in kernel mode) on any core.
	158	* It first checks the core private RPC fifo, an then the cluster shared RPC fifo.
	159	* It calls the rpc_activate_thread() function to activate a dedicated RPC thread.
	160	***********************************************************************************
	161	* @ returns true if at least one RPC found / false otherwise.
	162	**********************************************************************************/
	163	bool_t rpc_check();
	164
	165	/***********************************************************************************
	166	* This function contains the loop to execute all pending RPCs on the server side.
	167	* It should be called with irq disabled and after light lock acquisition.
	168	***********************************************************************************
	169	* @ rpc_fifo : pointer on the local RPC fifo
	170	* @ returns 0 if success
	171	**********************************************************************************/
	172	error_t rpc_execute_all( rpc_fifo_t * rpc_fifo );
	173
	174	/**********************************************************************************
	175	* This function is called by any thread running on any core in any cluster,
	176	* that detected a non-empty RPC_FIFO and got the RPC_FIFO ownership.
	177	* It activates one RPC thread, and immediately switches to the RPC thread.
	178	* It gets the first free RPC thread from the core free-list, or creates a new one
	179	* when the core free-list is empty.
	180	***********************************************************************************
	181	* @ rpc_fifo : pointer on the non-empty RPC fifo.
	182	* @ return 0 if success / return ENOMEM if error.
	183	**********************************************************************************/
	184	error_t rpc_activate_thread( rpc_fifo_t * rpc_fifo );
	185
	186	/***********************************************************************************
	187	* This function contains the infinite loop executed by each RPC thread.
	188	**********************************************************************************/
	189	void rpc_thread_func();
	190
	191	/***********************************************************************************
	192	* This function is executed in case of illegal RPC index.
	193	**********************************************************************************/
	194	void __attribute__((noinline)) rpc_undefined();
	195
[23]	196
	197
	198
[1]	199	/**********************************************************************************/
	200	/***** Marshalling functions attached to the various RPCs *********************/
	201	/**********************************************************************************/
	202
	203	/***********************************************************************************
[23]	204	* [0] The RPC_PMEM_GET_PAGES allocates one or several pages in a remote cluster,
[1]	205	* and returns the PPN of the first allocated page.
	206	***********************************************************************************
	207	* @ cxy : server cluster identifier
	208	* @ order : [in] ln2( number of requested pages )
	209	* @ error : [out] error status (0 if success)
	210	* @ ppn : [out] first physical page number
	211	**********************************************************************************/
	212	void rpc_pmem_get_pages_client( cxy_t cxy,
	213	uint32_t order,
	214	error_t * error,
	215	uint32_t * ppn );
	216
	217	void rpc_pmem_get_pages_server( xptr_t xp );
	218
	219	/***********************************************************************************
[23]	220	* [1] The RPC_PROCESS_PID_ALLOC allocates one new PID in a remote cluster, registers
[1]	221	* the new process in the remote cluster, and returns the PID, and an error code.
	222	***********************************************************************************
	223	* @ cxy : server cluster identifier.
	224	* @ process : [in] local pointer on process descriptor in client cluster.
	225	* @ error : [out] error status (0 if success).
	226	* @ pid : [out] new process identifier.
	227	**********************************************************************************/
	228	void rpc_process_pid_alloc_client( cxy_t cxy,
	229	struct process_s * process,
	230	error_t * error,
	231	pid_t * pid );
	232
	233	void rpc_process_pid_alloc_server( xptr_t xp );
	234
	235	/***********************************************************************************
[23]	236	* [2] The RPC_PROCESS_EXEC creates a process descriptor copy, in a remote cluster
[1]	237	* and initializes if from information found in the reference process descriptor.
	238	* This remote cluster becomes the new reference cluster.
	239	***********************************************************************************
	240	* @ cxy : server cluster identifier.
	241	* @ info : [in] pointer on local exec_info structure.
	242	* @ error : [out] error status (0 if success).
	243	**********************************************************************************/
	244	void rpc_process_exec_client( cxy_t cxy,
	245	struct exec_info_s * info,
	246	error_t * error );
	247
	248	void rpc_process_exec_server( xptr_t xp );
	249
	250	/***********************************************************************************
[23]	251	* [3] The RPC_PROCESS_KILL is actually a multicast RPC sent by the reference cluster
[1]	252	* to other clusters containing a process descriptor copy, to destroy these copies.
	253	***********************************************************************************
	254	* @ process : local pointer on target process.
	255	**********************************************************************************/
	256	void rpc_process_kill_client( struct process_s * process );
	257
	258	void rpc_process_kill_server( xptr_t xp );
	259
	260	/***********************************************************************************
[23]	261	* [4] The RPC_THREAD_USER_CREATE creates an user thread in the server cluster,
	262	* as specified by the arguments. It returns an extended pointer on the new
	263	* thread descriptor in server cluster, and an error code.
	264	* It is called by the sys_thread_create() system call.
[1]	265	***********************************************************************************
	266	* @ cxy : server cluster identifier.
	267	* @ attr : [in] pointer on pthread_attr_t in client cluster.
	268	* @ thread_xp : [out] pointer on buffer for thread extended pointer.
	269	* @ error : [out] error status (0 if success).
	270	**********************************************************************************/
	271	void rpc_thread_user_create_client( cxy_t cxy,
[23]	272	pid_t pid,
	273	void * start_func,
	274	void * start_arg,
[1]	275	struct pthread_attr_s * attr,
	276	xptr_t * thread_xp,
	277	error_t * error );
	278
	279	void rpc_thread_user_create_server( xptr_t xp );
	280
	281	/***********************************************************************************
[23]	282	* [5] The RPC_THREAD_KERNEL_CREATE creates a kernel thread in the server cluster,
[1]	283	* as specified by the type, func and args arguments. It returns the local pointer
	284	* on the thread descriptor in server cluster and an error code.
[23]	285	* It is used by the dev_init() function to create the device server thread.
[1]	286	***********************************************************************************
	287	* @ cxy : server cluster identifier.
	288	* @ type : [in] type of kernel thread.
	289	* @ func : [in] local pointer on thread function.
	290	* @ args : [in] local pointer on function arguments.
	291	* @ thread_xp : [out] pointer on buffer for thread extended pointer.
	292	* @ error : [out] error status (0 if success).
	293	**********************************************************************************/
	294	void rpc_thread_kernel_create_client( cxy_t cxy,
	295	uint32_t type,
	296	void * func,
	297	void * args,
	298	xptr_t * thread_xp,
	299	error_t * error );
	300
	301	void rpc_thread_kernel_create_server( xptr_t xp );
	302
[23]	303	/***********************************************************************************
	304	* [6] The RPC_SIGNAL_RISE ask a target cluster to register a given signal in
	305	* all threads descriptors of a given process.
	306	* It is used by the sys_kill() function.
	307	***********************************************************************************
	308	* @ cxy : server cluster identifier.
	309	* @ process : [in] local pointer on target process descriptor in server.
	310	* @ sig_id : [in] signal index.
	311	**********************************************************************************/
	312	void rpc_signal_rise_client( cxy_t cxy,
	313	struct process_s * process,
	314	uint32_t sig_id );
	315
	316	void rpc_signal_rise_server( xptr_t xp );
	317
[1]	318	/***********************************************************************************
[23]	319	* [10] The RPC_VFS_INODE_CREATE creates an inode and the associated mapper in a
[1]	320	* remote cluster. The parent dentry must have been previously created.
	321	* It returns an extended pointer on the created inode.
	322	***********************************************************************************
[23]	323	* @ cxy : server cluster identifier.
	324	* @ dentry_xp : [in] extended pointer on parent dentry.
	325	* @ fs_type : [in] file system type.
	326	* @ inode_type : [in] file system type.
	327	* @ attr : [in] inode attributes.
	328	* @ rights : [in] access rights
	329	* @ uid : [in] user ID
	330	* @ gid : [in] group ID
	331	* @ inode_xp : [out] buffer for extended pointer on created inode.
	332	* @ error : [out] error status (0 if success).
[1]	333	**********************************************************************************/
	334	void rpc_vfs_inode_create_client( cxy_t cxy,
	335	xptr_t dentry_xp,
[23]	336	uint32_t fs_type,
	337	uint32_t inode_type,
[1]	338	uint32_t attr,
[23]	339	uint32_t rights,
[1]	340	uint32_t uid,
	341	uint32_t gid,
	342	xptr_t * inode_xp,
	343	error_t * error );
	344
	345	void rpc_vfs_inode_create_server( xptr_t xp );
	346
	347	/***********************************************************************************
[23]	348	* [11] The RPC_VFS_INODE_DESTROY releases memory allocated for an inode descriptor
[1]	349	* and for the associated mapper in a remote cluster.
	350	***********************************************************************************
	351	* @ cxy : server cluster identifier
	352	* @ inode : [in] local pointer on inode.
	353	**********************************************************************************/
	354	void rpc_vfs_inode_destroy_client( cxy_t cxy,
	355	struct vfs_inode_s * inode );
	356
	357	void rpc_vfs_inode_destroy_server( xptr_t xp );
	358
	359	/***********************************************************************************
[23]	360	* [12] The RPC_VFS_DENTRY_CREATE creates a dentry in a remote cluster.
[1]	361	* It returns an extended pointer on the created dentry.
	362	***********************************************************************************
	363	* @ cxy : server cluster identifier
	364	* @ type : [in] file system type.
	365	* @ name : [in] directory entry name.
	366	* @ parent : [in] local pointer on parent inode.
	367	* @ dentry_xp : [out] buffer for extended pointer on created dentry.
	368	* @ error : [out] error status (0 if success).
	369	**********************************************************************************/
	370	void rpc_vfs_dentry_create_client( cxy_t cxy,
	371	uint32_t type,
	372	char * name,
	373	struct vfs_inode_s * parent,
	374	xptr_t * dentry_xp,
	375	error_t * error );
	376
	377	void rpc_vfs_dentry_create_server( xptr_t xp );
	378
	379	/***********************************************************************************
[23]	380	* [13] The RPC_VFS_DENTRY_DESTROY releases memory allocated for an dentry descriptor
[1]	381	* in a remote cluster.
	382	***********************************************************************************
	383	* @ cxy : server cluster identifier
	384	* @ dentry : [in] local pointer on dentry.
	385	**********************************************************************************/
	386	void rpc_vfs_dentry_destroy_client( cxy_t cxy,
	387	struct vfs_dentry_s * dentry );
	388
	389	void rpc_vfs_dentry_destroy_server( xptr_t xp );
	390
[23]	391	/***********************************************************************************
	392	* [14] The RPC_VFS_FILE_CREATE creates a file descriptor in a remote cluster.
	393	* It returns an extended pointer on the created file structure.
	394	***********************************************************************************
	395	* @ cxy : server cluster identifier
	396	* @ inode : [in] local pointer on parent inode.
	397	* @ file_attr : [in] new file attributes.
	398	* @ file_xp : [out] buffer for extended pointer on created file.
	399	* @ error : [out] error status (0 if success).
	400	**********************************************************************************/
	401	void rpc_vfs_file_create_client( cxy_t cxy,
	402	struct vfs_inode_s * inode,
	403	uint32_t file_attr,
	404	xptr_t * file_xp,
	405	error_t * error );
[1]	406
[23]	407	void rpc_vfs_file_create_server( xptr_t xp );
[1]	408
[23]	409	/***********************************************************************************
	410	* [15] The RPC_VFS_FILE_DESTROY releases memory allocated for a file descriptor
	411	* in a remote cluster.
	412	***********************************************************************************
	413	* @ cxy : server cluster identifier
	414	* @ file : [in] local pointer on file.
	415	**********************************************************************************/
	416	void rpc_vfs_file_destroy_client( cxy_t cxy,
	417	struct vfs_file_s * file );
[1]	418
[23]	419	void rpc_vfs_file_destroy_server( xptr_t xp );
	420
[1]	421	/***********************************************************************************
[23]	422	* [16] The RPC_FATFS_GET_CLUSTER can be send by any thread running in a "client"
	423	* cluster to scan the FAT mapper, stored in a remote "server" cluster, and get
	424	* from the mapper the local pointer on a given page.
	425	***********************************************************************************
	426	* @ cxy : server cluster identifier.
	427	* @ mapper : [in] local pointer on FAT mapper.
	428	* @ first : [in] FATFS cluster index allocated to first page of file.
	429	* @ page : [in] page index in file.
	430	* @ cluster : [out] local pointer on buffer for found FATFS cluster index.
	431	* @ error : [out] local pointer on buffer for error code (in client cluster).
	432	**********************************************************************************/
	433	void rpc_fatfs_get_cluster_client( cxy_t cxy,
	434	struct mapper_s * mapper,
	435	uint32_t first,
	436	uint32_t page,
	437	uint32_t * cluster,
	438	error_t * error );
	439
	440	void rpc_fatfs_get_cluster_server( xptr_t xp );
	441
	442	/***********************************************************************************
	443	* [20] The RPC_VMM_GET_REF_VSEG returns an extended pointer
[1]	444	* on the vseg containing a given virtual address in a given process.
	445	* The server cluster is supposed to be the reference cluster.
[16]	446	* It returns XPTR_NULL if no vseg has been founded.
[1]	447	***********************************************************************************
	448	* @ cxy : server cluster identifier.
	449	* @ process : [in] pointer on process descriptor in server cluster.
	450	* @ vaddr : [in] virtual address to be searched.
[16]	451	* @ vseg_xp : [out] buffer for extended pointer on vseg in client cluster.
[1]	452	**********************************************************************************/
	453	void rpc_vmm_get_ref_vseg_client( cxy_t cxy,
	454	struct process_s * process,
	455	intptr_t vaddr,
	456	xptr_t * vseg_xp );
	457
	458	void rpc_vmm_get_ref_vseg_server( xptr_t xp );
	459
	460	/***********************************************************************************
[23]	461	* [21] The RPC_VMM_GET_PTE returns in the "ppn" and "attr" arguments the PTE value
[1]	462	* for a given VPN in a given process.
	463	* The server cluster is supposed to be the reference cluster, and the vseg
	464	* containing the VPN must be registered in the reference VMM.
	465	* It returns an error if physical memory cannot be allocated for the PTE2,
	466	* or for the missing page itself.
	467	***********************************************************************************
	468	* @ cxy : server cluster identifier.
	469	* @ process : [in] pointer on process descriptor in server cluster.
	470	* @ vaddr : [in] virtual address to be searched.
	471	* @ attr : [out] address of buffer for attributes.
	472	* @ ppn : [out] address of buffer for PPN.
	473	* @ error : [out] address of buffer for error code.
	474	**********************************************************************************/
	475	void rpc_vmm_get_pte_client( cxy_t cxy,
	476	struct process_s * process,
	477	vpn_t vpn,
	478	uint32_t * attr,
	479	ppn_t * ppn,
	480	error_t * error );
	481
	482	void rpc_vmm_get_pte_server( xptr_t xp );
	483
	484	/***********************************************************************************
[23]	485	* [22] The RPC_KCM_ALLOC allocates memory from a given KCM in a remote cluster,
	486	* and returns an extended pointer on the allocated object.
	487	It returns XPTR_NULL if physical memory cannot be allocated.
[1]	488	***********************************************************************************
[23]	489	* @ cxy : server cluster identifier.
	490	* @ kmem_type : [in] KCM object type (as defined in kmem.h).
	491	* @ buf_xp : [out] buffer for extended pointer on allocated buffer.
[1]	492	**********************************************************************************/
[23]	493	void rpc_kcm_alloc_client( cxy_t cxy,
	494	uint32_t kmem_type,
	495	xptr_t * buf_xp );
[1]	496
[23]	497	void rpc_kcm_alloc_server( xptr_t xp );
[1]	498
	499	/***********************************************************************************
[23]	500	* [23] The RPC_KCM_FREE releases memory allocated for a KCM object of a given type,
[1]	501	* in a remote cluster.
	502	***********************************************************************************
[23]	503	* @ cxy : server cluster identifier.
	504	* @ buf : [in] local pointer on allocated buffer.
	505	* @ kmem_type : [in] KCM object type (as defined in kmem.h).
[1]	506	**********************************************************************************/
[23]	507	void rpc_kcm_free_client( cxy_t cxy,
	508	void * buf,
	509	uint32_t kmem_type );
[1]	510
[23]	511	void rpc_kcm_free_server( xptr_t xp );
[1]	512
	513	/***********************************************************************************
[23]	514	* [24] The RPC_MAPPER_MOVE is called by the vfs_move() function.
	515	* It allows a client thread to requires a remote mapper to move data to/from
	516	* an user buffer, as specified by the arguments.
[1]	517	***********************************************************************************
[23]	518	* @ cxy : server cluster identifier.
	519	* @ mapper : [in] local pointer on mapper
	520	* @ to_buffer : [in] move data from buffer to mapper if non zero.
	521	* @ file_offset : [in] first byte to move in mapper
	522	* @ buffer : [in] pointer on buffer in user space
	523	* @ size : [in] number of bytes to move
	524	* @ error : [out] error status (0 if success).
[1]	525	**********************************************************************************/
[23]	526	void rpc_mapper_move_client( cxy_t cxy,
	527	struct mapper_s * mapper,
	528	uint32_t to_buffer,
	529	uint32_t file_offset,
	530	void * buffer,
	531	uint32_t size,
	532	error_t * error );
[1]	533
	534	void rpc_mapper_move_server( xptr_t xp );
	535
	536
	537
[23]	538
[1]	539	#endif

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