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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <mdb/mdb_modapi.h>
#include <sys/buf.h>
#include <sys/var.h>
#include <vm/page.h>
#include "bio.h"
typedef struct buf_walk {
uintptr_t bw_hbufbase; /* Base address of hbuf buckets */
struct hbuf *bw_hbufs; /* Snapshot of hbuf buckets */
size_t bw_nhbufs; /* Number of hbuf buckets */
size_t bw_hbufi; /* Current hbuf index */
buf_t *bw_bufp; /* Current buffer */
} buf_walk_t;
int
buf_walk_init(mdb_walk_state_t *wsp)
{
struct hbuf *hbufs;
struct var v;
uintptr_t hbuf_addr;
size_t nbytes;
buf_walk_t *bwp;
if (wsp->walk_addr != 0) {
mdb_warn("only global buf walk supported\n");
return (WALK_ERR);
}
if (mdb_readvar(&v, "v") == -1) {
mdb_warn("failed to read var struct");
return (WALK_ERR);
}
if (mdb_readvar(&hbuf_addr, "hbuf") == -1) {
mdb_warn("failed to read hbuf pointer");
return (WALK_ERR);
}
nbytes = sizeof (struct hbuf) * v.v_hbuf;
hbufs = mdb_alloc(nbytes, UM_SLEEP);
if (mdb_vread(hbufs, nbytes, hbuf_addr) != nbytes) {
mdb_warn("failed to read hbufs");
mdb_free(hbufs, nbytes);
return (WALK_ERR);
}
bwp = mdb_alloc(sizeof (buf_walk_t), UM_SLEEP);
bwp->bw_hbufbase = hbuf_addr;
bwp->bw_hbufs = hbufs;
bwp->bw_nhbufs = v.v_hbuf;
bwp->bw_hbufi = 0;
bwp->bw_bufp = mdb_alloc(sizeof (buf_t), UM_SLEEP);
wsp->walk_addr = (uintptr_t)hbufs[0].b_forw;
wsp->walk_data = bwp;
return (WALK_NEXT);
}
int
buf_walk_step(mdb_walk_state_t *wsp)
{
buf_walk_t *bwp = wsp->walk_data;
uintptr_t addr;
/*
* If the next buf_t address we want is NULL or points back at the
* hbuf itself, advance to the next hash bucket. When we reach
* bw_nhbufs, we're done.
*/
while (wsp->walk_addr == 0 || wsp->walk_addr == (bwp->bw_hbufbase +
bwp->bw_hbufi * sizeof (struct hbuf))) {
if (++bwp->bw_hbufi == bwp->bw_nhbufs)
return (WALK_DONE);
wsp->walk_addr = (uintptr_t)
bwp->bw_hbufs[bwp->bw_hbufi].b_forw;
}
/*
* When we have a buf_t address, read the buffer and invoke our
* walk callback. We keep the next buf_t address in wsp->walk_addr.
*/
addr = wsp->walk_addr;
(void) mdb_vread(bwp->bw_bufp, sizeof (buf_t), addr);
wsp->walk_addr = (uintptr_t)bwp->bw_bufp->b_forw;
return (wsp->walk_callback(addr, bwp->bw_bufp, wsp->walk_cbdata));
}
void
buf_walk_fini(mdb_walk_state_t *wsp)
{
buf_walk_t *bwp = wsp->walk_data;
mdb_free(bwp->bw_hbufs, sizeof (struct hbuf) * bwp->bw_nhbufs);
mdb_free(bwp->bw_bufp, sizeof (buf_t));
mdb_free(bwp, sizeof (buf_walk_t));
}
/*ARGSUSED*/
int
bufpagefind(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
uintptr_t b_addr = addr;
uintptr_t arg;
page_t p;
buf_t b;
if (argc != 1)
return (DCMD_USAGE);
if (argv->a_type == MDB_TYPE_IMMEDIATE)
arg = (uintptr_t)argv->a_un.a_val;
else
arg = (uintptr_t)mdb_strtoull(argv->a_un.a_str);
if (mdb_vread(&b, sizeof (buf_t), b_addr) == -1)
return (DCMD_ERR);
for (addr = (uintptr_t)b.b_pages; addr != 0;
addr = (uintptr_t)p.p_next) {
if (addr == arg) {
mdb_printf("buf %p has page %p on b_pages list\n",
b_addr, addr);
break;
}
if (mdb_vread(&p, sizeof (page_t), addr) == -1)
return (DCMD_ERR);
}
return (DCMD_OK);
}
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