summaryrefslogtreecommitdiffstats
path: root/sys/vm/vm_contig.c
blob: b9e05797ca06ea6b91aadc90a1872a5e1d4e7b91 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
/*-
 * Copyright (c) 1991 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * The Mach Operating System project at Carnegie-Mellon University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *	from: @(#)vm_page.c	7.4 (Berkeley) 5/7/91
 */

/*-
 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/linker_set.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>
#include <sys/vnode.h>

#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_pager.h>
#include <vm/vm_phys.h>
#include <vm/vm_extern.h>

static int
vm_contig_launder_page(vm_page_t m, vm_page_t *next)
{
	vm_object_t object;
	vm_page_t m_tmp;
	struct vnode *vp;
	struct mount *mp;
	int vfslocked;

	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
	vm_page_lock_assert(m, MA_OWNED);
	object = m->object;
	if (!VM_OBJECT_TRYLOCK(object) &&
	    !vm_pageout_fallback_object_lock(m, next)) {
		vm_page_unlock(m);
		VM_OBJECT_UNLOCK(object);
		return (EAGAIN);
	}
	if (vm_page_sleep_if_busy(m, TRUE, "vpctw0")) {
		VM_OBJECT_UNLOCK(object);
		vm_page_lock_queues();
		return (EBUSY);
	}
	vm_page_test_dirty(m);
	if (m->dirty == 0 && m->hold_count == 0)
		pmap_remove_all(m);
	if (m->dirty != 0) {
		vm_page_unlock(m);
		if ((object->flags & OBJ_DEAD) != 0) {
			VM_OBJECT_UNLOCK(object);
			return (EAGAIN);
		}
		if (object->type == OBJT_VNODE) {
			vm_page_unlock_queues();
			vp = object->handle;
			vm_object_reference_locked(object);
			VM_OBJECT_UNLOCK(object);
			(void) vn_start_write(vp, &mp, V_WAIT);
			vfslocked = VFS_LOCK_GIANT(vp->v_mount);
			vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
			VM_OBJECT_LOCK(object);
			vm_object_page_clean(object, 0, 0, OBJPC_SYNC);
			VM_OBJECT_UNLOCK(object);
			VOP_UNLOCK(vp, 0);
			VFS_UNLOCK_GIANT(vfslocked);
			vm_object_deallocate(object);
			vn_finished_write(mp);
			vm_page_lock_queues();
			return (0);
		} else if (object->type == OBJT_SWAP ||
			   object->type == OBJT_DEFAULT) {
			vm_page_unlock_queues();
			m_tmp = m;
			vm_pageout_flush(&m_tmp, 1, VM_PAGER_PUT_SYNC);
			VM_OBJECT_UNLOCK(object);
			vm_page_lock_queues();
			return (0);
		}
	} else {
		if (m->hold_count == 0)
			vm_page_cache(m);
		vm_page_unlock(m);
	}
	VM_OBJECT_UNLOCK(object);
	return (0);
}

static int
vm_contig_launder(int queue, vm_paddr_t low, vm_paddr_t high)
{
	vm_page_t m, next;
	vm_paddr_t pa;
	int error;

	TAILQ_FOREACH_SAFE(m, &vm_page_queues[queue].pl, pageq, next) {

		/* Skip marker pages */
		if ((m->flags & PG_MARKER) != 0)
			continue;

		pa = VM_PAGE_TO_PHYS(m);
		if (pa < low || pa + PAGE_SIZE > high)
			continue;

		if (!vm_pageout_page_lock(m, &next)) {
			vm_page_unlock(m);
			continue;
		}
		KASSERT(VM_PAGE_INQUEUE2(m, queue),
		    ("vm_contig_launder: page %p's queue is not %d", m, queue));
		error = vm_contig_launder_page(m, &next);
		vm_page_lock_assert(m, MA_NOTOWNED);
		if (error == 0)
			return (TRUE);
		if (error == EBUSY)
			return (FALSE);
	}
	return (FALSE);
}

/*
 *	Frees the given physically contiguous pages.
 *
 *	N.B.: Any pages with PG_ZERO set must, in fact, be zero filled.
 */
static void
vm_page_release_contig(vm_page_t m, vm_pindex_t count)
{

	while (count--) {
		/* Leave PG_ZERO unchanged. */
		vm_page_free_toq(m);
		m++;
	}
}

/*
 * Increase the number of cached pages.
 */
void
vm_contig_grow_cache(int tries, vm_paddr_t low, vm_paddr_t high)
{
	int actl, actmax, inactl, inactmax;

	vm_page_lock_queues();
	inactl = 0;
	inactmax = tries < 1 ? 0 : cnt.v_inactive_count;
	actl = 0;
	actmax = tries < 2 ? 0 : cnt.v_active_count;
again:
	if (inactl < inactmax && vm_contig_launder(PQ_INACTIVE, low, high)) {
		inactl++;
		goto again;
	}
	if (actl < actmax && vm_contig_launder(PQ_ACTIVE, low, high)) {
		actl++;
		goto again;
	}
	vm_page_unlock_queues();
}

/*
 * Allocates a region from the kernel address map and pages within the
 * specified physical address range to the kernel object, creates a wired
 * mapping from the region to these pages, and returns the region's starting
 * virtual address.  The allocated pages are not necessarily physically
 * contiguous.  If M_ZERO is specified through the given flags, then the pages
 * are zeroed before they are mapped.
 */
vm_offset_t
kmem_alloc_attr(vm_map_t map, vm_size_t size, int flags, vm_paddr_t low,
    vm_paddr_t high, vm_memattr_t memattr)
{
	vm_object_t object = kernel_object;
	vm_offset_t addr, i, offset;
	vm_page_t m;
	int tries;

	size = round_page(size);
	vm_map_lock(map);
	if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
		vm_map_unlock(map);
		return (0);
	}
	offset = addr - VM_MIN_KERNEL_ADDRESS;
	vm_object_reference(object);
	vm_map_insert(map, object, offset, addr, addr + size, VM_PROT_ALL,
	    VM_PROT_ALL, 0);
	VM_OBJECT_LOCK(object);
	for (i = 0; i < size; i += PAGE_SIZE) {
		tries = 0;
retry:
		m = vm_phys_alloc_contig(1, low, high, PAGE_SIZE, 0);
		if (m == NULL) {
			if (tries < ((flags & M_NOWAIT) != 0 ? 1 : 3)) {
				VM_OBJECT_UNLOCK(object);
				vm_map_unlock(map);
				vm_contig_grow_cache(tries, low, high);
				vm_map_lock(map);
				VM_OBJECT_LOCK(object);
				goto retry;
			}
			while (i != 0) {
				i -= PAGE_SIZE;
				m = vm_page_lookup(object, OFF_TO_IDX(offset +
				    i));
				vm_page_free(m);
			}
			VM_OBJECT_UNLOCK(object);
			vm_map_delete(map, addr, addr + size);
			vm_map_unlock(map);
			return (0);
		}
		if (memattr != VM_MEMATTR_DEFAULT)
			pmap_page_set_memattr(m, memattr);
		vm_page_insert(m, object, OFF_TO_IDX(offset + i));
		if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
			pmap_zero_page(m);
		m->valid = VM_PAGE_BITS_ALL;
	}
	VM_OBJECT_UNLOCK(object);
	vm_map_unlock(map);
	vm_map_wire(map, addr, addr + size, VM_MAP_WIRE_SYSTEM |
	    VM_MAP_WIRE_NOHOLES);
	return (addr);
}

/*
 *	Allocates a region from the kernel address map, inserts the
 *	given physically contiguous pages into the kernel object,
 *	creates a wired mapping from the region to the pages, and
 *	returns the region's starting virtual address.  If M_ZERO is
 *	specified through the given flags, then the pages are zeroed
 *	before they are mapped.
 */
static vm_offset_t
contigmapping(vm_map_t map, vm_size_t size, vm_page_t m, vm_memattr_t memattr,
    int flags)
{
	vm_object_t object = kernel_object;
	vm_offset_t addr, tmp_addr;
 
	vm_map_lock(map);
	if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
		vm_map_unlock(map);
		return (0);
	}
	vm_object_reference(object);
	vm_map_insert(map, object, addr - VM_MIN_KERNEL_ADDRESS,
	    addr, addr + size, VM_PROT_ALL, VM_PROT_ALL, 0);
	vm_map_unlock(map);
	VM_OBJECT_LOCK(object);
	for (tmp_addr = addr; tmp_addr < addr + size; tmp_addr += PAGE_SIZE) {
		if (memattr != VM_MEMATTR_DEFAULT)
			pmap_page_set_memattr(m, memattr);
		vm_page_insert(m, object,
		    OFF_TO_IDX(tmp_addr - VM_MIN_KERNEL_ADDRESS));
		if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
			pmap_zero_page(m);
		m->valid = VM_PAGE_BITS_ALL;
		m++;
	}
	VM_OBJECT_UNLOCK(object);
	vm_map_wire(map, addr, addr + size,
	    VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES);
	return (addr);
}

void *
contigmalloc(
	unsigned long size,	/* should be size_t here and for malloc() */
	struct malloc_type *type,
	int flags,
	vm_paddr_t low,
	vm_paddr_t high,
	unsigned long alignment,
	unsigned long boundary)
{
	void *ret;

	ret = (void *)kmem_alloc_contig(kernel_map, size, flags, low, high,
	    alignment, boundary, VM_MEMATTR_DEFAULT);
	if (ret != NULL)
		malloc_type_allocated(type, round_page(size));
	return (ret);
}

vm_offset_t
kmem_alloc_contig(vm_map_t map, vm_size_t size, int flags, vm_paddr_t low,
    vm_paddr_t high, unsigned long alignment, unsigned long boundary,
    vm_memattr_t memattr)
{
	vm_offset_t ret;
	vm_page_t pages;
	unsigned long npgs;
	int tries;

	size = round_page(size);
	npgs = size >> PAGE_SHIFT;
	tries = 0;
retry:
	pages = vm_phys_alloc_contig(npgs, low, high, alignment, boundary);
	if (pages == NULL) {
		if (tries < ((flags & M_NOWAIT) != 0 ? 1 : 3)) {
			vm_contig_grow_cache(tries, low, high);
			tries++;
			goto retry;
		}
		ret = 0;
	} else {
		ret = contigmapping(map, size, pages, memattr, flags);
		if (ret == 0)
			vm_page_release_contig(pages, npgs);
	}
	return (ret);
}

void
contigfree(void *addr, unsigned long size, struct malloc_type *type)
{

	kmem_free(kernel_map, (vm_offset_t)addr, size);
	malloc_type_freed(type, round_page(size));
}
OpenPOWER on IntegriCloud