WebSVN – HelenOS – Diff – /tags/0.2.0.1/kernel/generic/src/mm/tlb.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file    tlb.c
 * @brief   Generic TLB shootdown algorithm.
 *
 * The algorithm implemented here is based on the CMU TLB shootdown
 * algorithm and is further simplified (e.g. all CPUs receive all TLB
 * shootdown messages).
 */
 
#include <mm/tlb.h>
#include <mm/asid.h>
#include <arch/mm/tlb.h>
#include <smp/ipi.h>
#include <synch/spinlock.h>
#include <typedefs.h>
#include <atomic.h>
#include <arch/interrupt.h>
#include <config.h>
#include <arch.h>
#include <panic.h>
#include <debug.h>
 
/**
 * This lock is used for synchronisation between sender and
 * recipients of TLB shootdown message. It must be acquired
 * before CPU structure lock.
 */
SPINLOCK_INITIALIZE(tlblock);
 
void tlb_init(void)
{
    tlb_arch_init();
}
 
#ifdef CONFIG_SMP
 
/** Send TLB shootdown message.
 *
 * This function attempts to deliver TLB shootdown message
 * to all other processors.
 *
 * This function must be called with interrupts disabled.
 *
 * @param type Type describing scope of shootdown.
 * @param asid Address space, if required by type.
 * @param page Virtual page address, if required by type.
 * @param count Number of pages, if required by type.
 */
void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t count)
{
    int i;
 
    CPU->tlb_active = 0;
    spinlock_lock(&tlblock);
   
    for (i = 0; i < config.cpu_count; i++) {
        cpu_t *cpu;
       
        if (i == CPU->id)
            continue;
 
        cpu = &cpus[i];
        spinlock_lock(&cpu->lock);
        if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) {
            /*
             * The message queue is full.
             * Erase the queue and store one TLB_INVL_ALL message.
             */
            cpu->tlb_messages_count = 1;
            cpu->tlb_messages[0].type = TLB_INVL_ALL;
            cpu->tlb_messages[0].asid = ASID_INVALID;
            cpu->tlb_messages[0].page = 0;
            cpu->tlb_messages[0].count = 0;
        } else {
            /*
             * Enqueue the message.
             */
            cpu->tlb_messages[cpu->tlb_messages_count].type = type;
            cpu->tlb_messages[cpu->tlb_messages_count].asid = asid;
            cpu->tlb_messages[cpu->tlb_messages_count].page = page;
            cpu->tlb_messages[cpu->tlb_messages_count].count = count;
            cpu->tlb_messages_count++;
        }
        spinlock_unlock(&cpu->lock);
    }
   
    tlb_shootdown_ipi_send();
 
busy_wait: 
    for (i = 0; i < config.cpu_count; i++)
        if (cpus[i].tlb_active)
            goto busy_wait;
}
 
/** Finish TLB shootdown sequence. */
void tlb_shootdown_finalize(void)
{
    spinlock_unlock(&tlblock);
    CPU->tlb_active = 1;
}
 
void tlb_shootdown_ipi_send(void)
{
    ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);
}
 
/** Receive TLB shootdown message. */
void tlb_shootdown_ipi_recv(void)
{
    tlb_invalidate_type_t type;
    asid_t asid;
    __address page;
    count_t count;
    int i;
   
    ASSERT(CPU);
   
    CPU->tlb_active = 0;
    spinlock_lock(&tlblock);
    spinlock_unlock(&tlblock);
   
    spinlock_lock(&CPU->lock);
    ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN);
 
    for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) {
        type = CPU->tlb_messages[i].type;
        asid = CPU->tlb_messages[i].asid;
        page = CPU->tlb_messages[i].page;
        count = CPU->tlb_messages[i].count;
 
        switch (type) {
            case TLB_INVL_ALL:
            tlb_invalidate_all();
            break;
            case TLB_INVL_ASID:
            tlb_invalidate_asid(asid);
            break;
            case TLB_INVL_PAGES:
                ASSERT(count);
            tlb_invalidate_pages(asid, page, count);
            break;
            default:
            panic("unknown type (%d)\n", type);
            break;
        }
        if (type == TLB_INVL_ALL)
            break;
    }
   
    spinlock_unlock(&CPU->lock);
    CPU->tlb_active = 1;
}
 
#endif /* CONFIG_SMP */
 

Rev 1965	Rev 1968
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/**	29	/**
30	* @file tlb.c	30	* @file tlb.c
31	* @brief Generic TLB shootdown algorithm.	31	* @brief Generic TLB shootdown algorithm.
32	*	32	*
33	* The algorithm implemented here is based on the CMU TLB shootdown	33	* The algorithm implemented here is based on the CMU TLB shootdown
34	* algorithm and is further simplified (e.g. all CPUs receive all TLB	34	* algorithm and is further simplified (e.g. all CPUs receive all TLB
35	* shootdown messages).	35	* shootdown messages).
36	*/	36	*/
37		37
38	#include <mm/tlb.h>	38	#include <mm/tlb.h>
39	#include <mm/asid.h>	39	#include <mm/asid.h>
40	#include <arch/mm/tlb.h>	40	#include <arch/mm/tlb.h>
41	#include <smp/ipi.h>	41	#include <smp/ipi.h>
42	#include <synch/spinlock.h>	42	#include <synch/spinlock.h>
43	#include <typedefs.h>	43	#include <typedefs.h>
44	#include <atomic.h>	44	#include <atomic.h>
45	#include <arch/interrupt.h>	45	#include <arch/interrupt.h>
46	#include <config.h>	46	#include <config.h>
47	#include <arch.h>	47	#include <arch.h>
48	#include <panic.h>	48	#include <panic.h>
49	#include <debug.h>	49	#include <debug.h>
50		50
51	/**	51	/**
52	* This lock is used for synchronisation between sender and	52	* This lock is used for synchronisation between sender and
53	* recipients of TLB shootdown message. It must be acquired	53	* recipients of TLB shootdown message. It must be acquired
54	* before CPU structure lock.	54	* before CPU structure lock.
55	*/	55	*/
56	SPINLOCK_INITIALIZE(tlblock);	56	SPINLOCK_INITIALIZE(tlblock);
57		57
58	void tlb_init(void)	58	void tlb_init(void)
59	{	59	{
60	tlb_arch_init();	60	tlb_arch_init();
61	}	61	}
62		62
63	#ifdef CONFIG_SMP	63	#ifdef CONFIG_SMP
64		64
65	/** Send TLB shootdown message.	65	/** Send TLB shootdown message.
66	*	66	*
67	* This function attempts to deliver TLB shootdown message	67	* This function attempts to deliver TLB shootdown message
68	* to all other processors.	68	* to all other processors.
69	*	69	*
70	* This function must be called with interrupts disabled.	70	* This function must be called with interrupts disabled.
71	*	71	*
72	* @param type Type describing scope of shootdown.	72	* @param type Type describing scope of shootdown.
73	* @param asid Address space, if required by type.	73	* @param asid Address space, if required by type.
74	* @param page Virtual page address, if required by type.	74	* @param page Virtual page address, if required by type.
75	* @param count Number of pages, if required by type.	75	* @param count Number of pages, if required by type.
76	*/	76	*/
77	void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t count)	77	void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t count)
78	{	78	{
79	int i;	79	int i;
80		80
81	CPU->tlb_active = 0;	81	CPU->tlb_active = 0;
82	spinlock_lock(&tlblock);	82	spinlock_lock(&tlblock);
83		83
84	for (i = 0; i < config.cpu_count; i++) {	84	for (i = 0; i < config.cpu_count; i++) {
85	cpu_t *cpu;	85	cpu_t *cpu;
86		86
87	if (i == CPU->id)	87	if (i == CPU->id)
88	continue;	88	continue;
89		89
90	cpu = &cpus[i];	90	cpu = &cpus[i];
91	spinlock_lock(&cpu->lock);	91	spinlock_lock(&cpu->lock);
92	if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) {	92	if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) {
93	/*	93	/*
94	* The message queue is full.	94	* The message queue is full.
95	* Erase the queue and store one TLB_INVL_ALL message.	95	* Erase the queue and store one TLB_INVL_ALL message.
96	*/	96	*/
97	cpu->tlb_messages_count = 1;	97	cpu->tlb_messages_count = 1;
98	cpu->tlb_messages[0].type = TLB_INVL_ALL;	98	cpu->tlb_messages[0].type = TLB_INVL_ALL;
99	cpu->tlb_messages[0].asid = ASID_INVALID;	99	cpu->tlb_messages[0].asid = ASID_INVALID;
100	cpu->tlb_messages[0].page = 0;	100	cpu->tlb_messages[0].page = 0;
101	cpu->tlb_messages[0].count = 0;	101	cpu->tlb_messages[0].count = 0;
102	} else {	102	} else {
103	/*	103	/*
104	* Enqueue the message.	104	* Enqueue the message.
105	*/	105	*/
106	cpu->tlb_messages[cpu->tlb_messages_count].type = type;	106	cpu->tlb_messages[cpu->tlb_messages_count].type = type;
107	cpu->tlb_messages[cpu->tlb_messages_count].asid = asid;	107	cpu->tlb_messages[cpu->tlb_messages_count].asid = asid;
108	cpu->tlb_messages[cpu->tlb_messages_count].page = page;	108	cpu->tlb_messages[cpu->tlb_messages_count].page = page;
109	cpu->tlb_messages[cpu->tlb_messages_count].count = count;	109	cpu->tlb_messages[cpu->tlb_messages_count].count = count;
110	cpu->tlb_messages_count++;	110	cpu->tlb_messages_count++;
111	}	111	}
112	spinlock_unlock(&cpu->lock);	112	spinlock_unlock(&cpu->lock);
113	}	113	}
114		114
115	tlb_shootdown_ipi_send();	115	tlb_shootdown_ipi_send();
116		116
117	busy_wait:	117	busy_wait:
118	for (i = 0; i < config.cpu_count; i++)	118	for (i = 0; i < config.cpu_count; i++)
119	if (cpus[i].tlb_active)	119	if (cpus[i].tlb_active)
120	goto busy_wait;	120	goto busy_wait;
121	}	121	}
122		122
123	/** Finish TLB shootdown sequence. */	123	/** Finish TLB shootdown sequence. */
124	void tlb_shootdown_finalize(void)	124	void tlb_shootdown_finalize(void)
125	{	125	{
126	spinlock_unlock(&tlblock);	126	spinlock_unlock(&tlblock);
127	CPU->tlb_active = 1;	127	CPU->tlb_active = 1;
128	}	128	}
129		129
130	void tlb_shootdown_ipi_send(void)	130	void tlb_shootdown_ipi_send(void)
131	{	131	{
132	ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);	132	ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);
133	}	133	}
134		134
135	/** Receive TLB shootdown message. */	135	/** Receive TLB shootdown message. */
136	void tlb_shootdown_ipi_recv(void)	136	void tlb_shootdown_ipi_recv(void)
137	{	137	{
138	tlb_invalidate_type_t type;	138	tlb_invalidate_type_t type;
139	asid_t asid;	139	asid_t asid;
140	__address page;	140	__address page;
141	count_t count;	141	count_t count;
142	int i;	142	int i;
143		143
144	ASSERT(CPU);	144	ASSERT(CPU);
145		145
146	CPU->tlb_active = 0;	146	CPU->tlb_active = 0;
147	spinlock_lock(&tlblock);	147	spinlock_lock(&tlblock);
148	spinlock_unlock(&tlblock);	148	spinlock_unlock(&tlblock);
149		149
150	spinlock_lock(&CPU->lock);	150	spinlock_lock(&CPU->lock);
151	ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN);	151	ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN);
152		152
153	for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) {	153	for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) {
154	type = CPU->tlb_messages[i].type;	154	type = CPU->tlb_messages[i].type;
155	asid = CPU->tlb_messages[i].asid;	155	asid = CPU->tlb_messages[i].asid;
156	page = CPU->tlb_messages[i].page;	156	page = CPU->tlb_messages[i].page;
157	count = CPU->tlb_messages[i].count;	157	count = CPU->tlb_messages[i].count;
158		158
159	switch (type) {	159	switch (type) {
160	case TLB_INVL_ALL:	160	case TLB_INVL_ALL:
161	tlb_invalidate_all();	161	tlb_invalidate_all();
162	break;	162	break;
163	case TLB_INVL_ASID:	163	case TLB_INVL_ASID:
164	tlb_invalidate_asid(asid);	164	tlb_invalidate_asid(asid);
165	break;	165	break;
166	case TLB_INVL_PAGES:	166	case TLB_INVL_PAGES:
167	ASSERT(count);	167	ASSERT(count);
168	tlb_invalidate_pages(asid, page, count);	168	tlb_invalidate_pages(asid, page, count);
169	break;	169	break;
170	default:	170	default:
171	panic("unknown type (%d)\n", type);	171	panic("unknown type (%d)\n", type);
172	break;	172	break;
173	}	173	}
174	if (type == TLB_INVL_ALL)	174	if (type == TLB_INVL_ALL)
175	break;	175	break;
176	}	176	}
177		177
178	spinlock_unlock(&CPU->lock);	178	spinlock_unlock(&CPU->lock);
179	CPU->tlb_active = 1;	179	CPU->tlb_active = 1;
180	}	180	}
181		181
182	#endif /* CONFIG_SMP */	182	#endif /* CONFIG_SMP */
183		183

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(root)/tags/0.2.0.1/kernel/generic/src/mm/tlb.c – Rev 1965 → 1968