2 * Copyright (c) 2010 by The DragonFly Project and Samuel J. Greear.
5 * This code is derived from software contributed to The DragonFly Project
6 * by Samuel J. Greear <sjg@thesjg.com>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/types.h>
37 #include <sys/kernel.h>
38 #include <sys/objcache.h>
39 #include <sys/sysctl.h>
40 #include <sys/param.h>
41 #include <sys/serialize.h>
42 #include <sys/systm.h>
44 #include <sys/queue.h>
47 #include <vm/vm_extern.h>
48 #include <vm/vm_kern.h>
49 #include <vm/vm_page.h>
50 #include <cpu/lwbuf.h>
51 #include <machine/globaldata.h>
52 #include <machine/atomic.h>
53 #include <machine/param.h>
55 static void lwbuf_init(void *);
56 SYSINIT(sock_lwb, SI_BOOT2_MACHDEP, SI_ORDER_ANY, lwbuf_init, NULL);
58 /* Number of pages of KVA to allocate at boot per cpu (1MB) */
59 #define LWBUF_BOOT_PAGES 256
60 /* Number to allocate incrementally (128KB) */
61 #define LWBUF_ALLOC_PAGES 32
63 static struct objcache *lwbuf_cache;
65 MALLOC_DEFINE(M_LWBUF, "lwbuf", "Lightweight buffers");
66 struct objcache_malloc_args lwbuf_malloc_args = { sizeof(struct lwbuf), M_LWBUF };
70 lwbuf_cache_ctor(void *obj, void *pdata, int ocflags)
72 struct lwbuf *lwb = (struct lwbuf *)obj;
82 lwbuf_initpages(struct lwbuf_free_kvp_list *fkvpl, int pages)
84 struct lwbuf_free_kvp *free_kvp;
88 k = kmem_alloc_nofault(&kernel_map, PAGE_SIZE * pages, PAGE_SIZE);
92 for (i = 0; i < pages; ++i) {
93 free_kvp = (struct lwbuf_free_kvp *)
94 kmalloc(sizeof(*free_kvp), M_LWBUF, M_WAITOK | M_ZERO);
96 free_kvp->kva = k + (i * PAGE_SIZE);
97 SLIST_INSERT_HEAD(fkvpl, free_kvp, next);
104 lwbuf_init(void *arg)
106 struct mdglobaldata *gd = mdcpu;
109 lwbuf_cache = objcache_create("lwbuf", 0, 0,
110 lwbuf_cache_ctor, NULL, NULL,
111 objcache_malloc_alloc, objcache_malloc_free,
114 /* Should probably be in cpu_gdinit */
115 for (i = 0; i < SMP_MAXCPU; ++i) {
116 SLIST_INIT(&gd->gd_lwbuf_fpages);
117 lwbuf_initpages(&gd->gd_lwbuf_fpages, LWBUF_BOOT_PAGES);
122 lwbuf_alloc(vm_page_t m)
124 struct mdglobaldata *gd = mdcpu;
125 struct lwbuf_free_kvp *free_kvp;
128 if ((lwb = objcache_get(lwbuf_cache, M_WAITOK)) == NULL)
133 crit_enter_gd(&gd->mi);
135 if (!SLIST_EMPTY(&gd->gd_lwbuf_fpages)) {
136 free_kvp = SLIST_FIRST(&gd->gd_lwbuf_fpages);
137 SLIST_REMOVE_HEAD(&gd->gd_lwbuf_fpages, next);
139 lwb->kva = free_kvp->kva;
141 kfree(free_kvp, M_LWBUF);
143 if (lwbuf_initpages(&gd->gd_lwbuf_fpages,
144 LWBUF_ALLOC_PAGES) == FALSE)
145 tsleep(&gd->gd_lwbuf_fpages, 0, "lwbuf", 0);
149 crit_exit_gd(&gd->mi);
151 pmap_kenter_quick(lwb->kva, lwb->m->phys_addr);
152 lwb->cpumask |= gd->mi.gd_cpumask;
158 lwbuf_free(struct lwbuf *lwb)
160 struct mdglobaldata *gd = mdcpu;
161 struct lwbuf_free_kvp *free_kvp;
163 free_kvp = (struct lwbuf_free_kvp *)
164 kmalloc(sizeof(*free_kvp), M_LWBUF, M_WAITOK);
165 free_kvp->kva = lwb->kva;
166 crit_enter_gd(&gd->mi);
167 SLIST_INSERT_HEAD(&gd->gd_lwbuf_fpages, free_kvp, next);
168 crit_exit_gd(&gd->mi);
169 wakeup_one(&gd->gd_lwbuf_fpages);
175 objcache_put(lwbuf_cache, lwb);
179 lwbuf_set_global(struct lwbuf *lwb)
181 pmap_kenter_sync(lwb->kva);
182 lwb->cpumask = (cpumask_t)-1;
186 _lwbuf_kva(struct lwbuf *lwb, struct mdglobaldata *gd)
190 pmap_kenter_sync_quick(lwb->kva);
194 new = old | gd->mi.gd_cpumask;
195 } while (atomic_cmpset_int(&lwb->cpumask, old, new) == 0);
201 lwbuf_kva(struct lwbuf *lwb)
203 struct mdglobaldata *gd = mdcpu;
205 if (lwb->cpumask & gd->mi.gd_cpumask)
208 return (_lwbuf_kva(lwb, gd));