WebSVN – HelenOS-historic – Diff – /kernel/trunk/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.
 */
 
#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 <arch/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 1002	Rev 1008
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	#include <mm/tlb.h>	29	#include <mm/tlb.h>
30	#include <mm/asid.h>	30	#include <mm/asid.h>
31	#include <arch/mm/tlb.h>	31	#include <arch/mm/tlb.h>
32	#include <smp/ipi.h>	32	#include <smp/ipi.h>
33	#include <synch/spinlock.h>	33	#include <synch/spinlock.h>
34	#include <typedefs.h>	34	#include <typedefs.h>
35	#include <arch/atomic.h>	35	#include <arch/atomic.h>
36	#include <arch/interrupt.h>	36	#include <arch/interrupt.h>
37	#include <config.h>	37	#include <config.h>
38	#include <arch.h>	38	#include <arch.h>
39	#include <panic.h>	39	#include <panic.h>
40	#include <debug.h>	40	#include <debug.h>
41		41
42	/**	42	/**
43	* This lock is used for synchronisation between sender and	43	* This lock is used for synchronisation between sender and
44	* recipients of TLB shootdown message. It must be acquired	44	* recipients of TLB shootdown message. It must be acquired
45	* before CPU structure lock.	45	* before CPU structure lock.
46	*/	46	*/
47	SPINLOCK_INITIALIZE(tlblock);	47	SPINLOCK_INITIALIZE(tlblock);
48		48
49	void tlb_init(void)	49	void tlb_init(void)
50	{	50	{
51	tlb_arch_init();	51	tlb_arch_init();
52	}	52	}
53		53
54	#ifdef CONFIG_SMP	54	#ifdef CONFIG_SMP
55		55
56	/** Send TLB shootdown message.	56	/** Send TLB shootdown message.
57	*	57	*
58	* This function attempts to deliver TLB shootdown message	58	* This function attempts to deliver TLB shootdown message
59	* to all other processors.	59	* to all other processors.
60	*	60	*
61	* This function must be called with interrupts disabled.	61	* This function must be called with interrupts disabled.
62	*	62	*
63	* @param type Type describing scope of shootdown.	63	* @param type Type describing scope of shootdown.
64	* @param asid Address space, if required by type.	64	* @param asid Address space, if required by type.
65	* @param page Virtual page address, if required by type.	65	* @param page Virtual page address, if required by type.
66	* @param count Number of pages, if required by type.	66	* @param count Number of pages, if required by type.
67	*/	67	*/
68	void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t count)	68	void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t count)
69	{	69	{
70	int i;	70	int i;
71		71
72	CPU->tlb_active = 0;	72	CPU->tlb_active = 0;
73	spinlock_lock(&tlblock);	73	spinlock_lock(&tlblock);
74		74
75	for (i = 0; i < config.cpu_count; i++) {	75	for (i = 0; i < config.cpu_count; i++) {
76	cpu_t *cpu;	76	cpu_t *cpu;
77		77
78	if (i == CPU->id)	78	if (i == CPU->id)
79	continue;	79	continue;
80		80
81	cpu = &cpus[i];	81	cpu = &cpus[i];
82	spinlock_lock(&cpu->lock);	82	spinlock_lock(&cpu->lock);
83	if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) {	83	if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) {
84	/*	84	/*
85	* The message queue is full.	85	* The message queue is full.
86	* Erase the queue and store one TLB_INVL_ALL message.	86	* Erase the queue and store one TLB_INVL_ALL message.
87	*/	87	*/
88	cpu->tlb_messages_count = 1;	88	cpu->tlb_messages_count = 1;
89	cpu->tlb_messages[0].type = TLB_INVL_ALL;	89	cpu->tlb_messages[0].type = TLB_INVL_ALL;
90	cpu->tlb_messages[0].asid = ASID_INVALID;	90	cpu->tlb_messages[0].asid = ASID_INVALID;
91	cpu->tlb_messages[0].page = 0;	91	cpu->tlb_messages[0].page = 0;
92	cpu->tlb_messages[0].count = 0;	92	cpu->tlb_messages[0].count = 0;
93	} else {	93	} else {
94	/*	94	/*
95	* Enqueue the message.	95	* Enqueue the message.
96	*/	96	*/
97	cpu->tlb_messages[cpu->tlb_messages_count].type = type;	97	cpu->tlb_messages[cpu->tlb_messages_count].type = type;
98	cpu->tlb_messages[cpu->tlb_messages_count].asid = asid;	98	cpu->tlb_messages[cpu->tlb_messages_count].asid = asid;
99	cpu->tlb_messages[cpu->tlb_messages_count].page = page;	99	cpu->tlb_messages[cpu->tlb_messages_count].page = page;
100	cpu->tlb_messages[cpu->tlb_messages_count].count = count;	100	cpu->tlb_messages[cpu->tlb_messages_count].count = count;
101	cpu->tlb_messages_count++;	101	cpu->tlb_messages_count++;
102	}	102	}
103	spinlock_unlock(&cpu->lock);	103	spinlock_unlock(&cpu->lock);
104	}	104	}
105		105
106	tlb_shootdown_ipi_send();	106	tlb_shootdown_ipi_send();
107		107
108	busy_wait:	108	busy_wait:
109	for (i = 0; i < config.cpu_count; i++)	109	for (i = 0; i < config.cpu_count; i++)
110	if (cpus[i].tlb_active)	110	if (cpus[i].tlb_active)
111	goto busy_wait;	111	goto busy_wait;
112	}	112	}
113		113
114	/** Finish TLB shootdown sequence. */	114	/** Finish TLB shootdown sequence. */
115	void tlb_shootdown_finalize(void)	115	void tlb_shootdown_finalize(void)
116	{	116	{
117	spinlock_unlock(&tlblock);	117	spinlock_unlock(&tlblock);
118	CPU->tlb_active = 1;	118	CPU->tlb_active = 1;
119	}	119	}
120		120
121	void tlb_shootdown_ipi_send(void)	121	void tlb_shootdown_ipi_send(void)
122	{	122	{
123	ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);	123	ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);
124	}	124	}
125		125
126	/** Receive TLB shootdown message. */	126	/** Receive TLB shootdown message. */
127	void tlb_shootdown_ipi_recv(void)	127	void tlb_shootdown_ipi_recv(void)
128	{	128	{
129	tlb_invalidate_type_t type;	129	tlb_invalidate_type_t type;
130	asid_t asid;	130	asid_t asid;
131	__address page;	131	__address page;
132	count_t count;	132	count_t count;
133	int i;	133	int i;
134		134
-		135	ASSERT(CPU);
-		136
135	CPU->tlb_active = 0;	137	CPU->tlb_active = 0;
136	spinlock_lock(&tlblock);	138	spinlock_lock(&tlblock);
137	spinlock_unlock(&tlblock);	139	spinlock_unlock(&tlblock);
138		140
139	spinlock_lock(&CPU->lock);	141	spinlock_lock(&CPU->lock);
140	ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN);	142	ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN);
141		143
142	for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) {	144	for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) {
143	type = CPU->tlb_messages[i].type;	145	type = CPU->tlb_messages[i].type;
144	asid = CPU->tlb_messages[i].asid;	146	asid = CPU->tlb_messages[i].asid;
145	page = CPU->tlb_messages[i].page;	147	page = CPU->tlb_messages[i].page;
146	count = CPU->tlb_messages[i].count;	148	count = CPU->tlb_messages[i].count;
147		149
148	switch (type) {	150	switch (type) {
149	case TLB_INVL_ALL:	151	case TLB_INVL_ALL:
150	tlb_invalidate_all();	152	tlb_invalidate_all();
151	break;	153	break;
152	case TLB_INVL_ASID:	154	case TLB_INVL_ASID:
153	tlb_invalidate_asid(asid);	155	tlb_invalidate_asid(asid);
154	break;	156	break;
155	case TLB_INVL_PAGES:	157	case TLB_INVL_PAGES:
156	ASSERT(count);	158	ASSERT(count);
157	tlb_invalidate_pages(asid, page, count);	159	tlb_invalidate_pages(asid, page, count);
158	break;	160	break;
159	default:	161	default:
160	panic("unknown type (%d)\n", type);	162	panic("unknown type (%d)\n", type);
161	break;	163	break;
162	}	164	}
163	if (type == TLB_INVL_ALL)	165	if (type == TLB_INVL_ALL)
164	break;	166	break;
165	}	167	}
166		168
167	spinlock_unlock(&CPU->lock);	169	spinlock_unlock(&CPU->lock);
168	CPU->tlb_active = 1;	170	CPU->tlb_active = 1;
169	}	171	}
170		172
171	#endif /* CONFIG_SMP */	173	#endif /* CONFIG_SMP */
172		174

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(root)/kernel/trunk/generic/src/mm/tlb.c – Rev 1002 → 1008