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Implement support for CPU private mappings within sf_buf_alloc().

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This commit is contained in:
Alan Cox 2005-02-13 06:23:13 +00:00
parent 3b278dbbfb
commit 5c0db7c71a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=141784
2 changed files with 37 additions and 1 deletions
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33
sys/i386/i386/vm_machdep.c
View file

@ -76,6 +76,7 @@ __FBSDID("$FreeBSD$");
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/pcb_ext.h>
#include <machine/smp.h>
#include <machine/vm86.h>
#ifdef CPU_ELAN
@ -610,8 +611,13 @@ sf_buf_alloc(struct vm_page *m, int flags)
pt_entry_t opte, *ptep;
struct sf_head *hash_list;
struct sf_buf *sf;
#ifdef SMP
cpumask_t cpumask, other_cpus;
#endif
int error;
KASSERT(curthread->td_pinned > 0 || (flags & SFB_CPUPRIVATE) == 0,
("sf_buf_alloc(SFB_CPUPRIVATE): curthread not pinned"));
hash_list = &sf_buf_active[SF_BUF_HASH(m)];
mtx_lock(&sf_buf_lock);
LIST_FOREACH(sf, hash_list, list_entry) {
@ -622,6 +628,22 @@ sf_buf_alloc(struct vm_page *m, int flags)
nsfbufsused++;
nsfbufspeak = imax(nsfbufspeak, nsfbufsused);
}
#ifdef SMP
cpumask = PCPU_GET(cpumask);
if ((sf->cpumask & cpumask) == 0) {
sf->cpumask |= cpumask;
invlpg(sf->kva);
}
if ((flags & SFB_CPUPRIVATE) == 0) {
other_cpus = PCPU_GET(other_cpus) & ~sf->cpumask;
if (other_cpus != 0) {
sf->cpumask |= other_cpus;
mtx_lock_spin(&smp_ipi_mtx);
smp_masked_invlpg(other_cpus, sf->kva);
mtx_unlock_spin(&smp_ipi_mtx);
}
}
#endif
goto done;
}
}
@ -660,6 +682,17 @@ sf_buf_alloc(struct vm_page *m, int flags)
ptep = vtopte(sf->kva);
opte = *ptep;
*ptep = VM_PAGE_TO_PHYS(m) | pgeflag | PG_RW | PG_V;
#ifdef SMP
if (flags & SFB_CPUPRIVATE) {
if ((opte & (PG_A | PG_V)) == (PG_A | PG_V)) {
sf->cpumask = PCPU_GET(cpumask);
invlpg(sf->kva);
} else
sf->cpumask = all_cpus;
goto done;
} else
sf->cpumask = all_cpus;
#endif
if ((opte & (PG_A | PG_V)) == (PG_A | PG_V))
pmap_invalidate_page(kernel_pmap, sf->kva);
done:

5
sys/i386/include/sf_buf.h
View file

@ -1,5 +1,5 @@
/*-
* Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
* Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -39,6 +39,9 @@ struct sf_buf {
struct vm_page *m; /* currently mapped page */
vm_offset_t kva; /* va of mapping */
int ref_count; /* usage of this mapping */
#ifdef SMP
cpumask_t cpumask; /* cpus on which mapping is valid */
#endif
};
static __inline vm_offset_t