These changes prevent sysctl(8) from returning proper output, such as: 1) no output from sysctl(8) 2) erroneously returning ENOMEM with tools like truss(1) or uname(1) truss: can not get etype: Cannot allocate memory
1170 lines
29 KiB
C
1170 lines
29 KiB
C
/*-
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* Copyright 1998 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* The kernel resource manager. This code is responsible for keeping track
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* of hardware resources which are apportioned out to various drivers.
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* It does not actually assign those resources, and it is not expected
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* that end-device drivers will call into this code directly. Rather,
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* the code which implements the buses that those devices are attached to,
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* and the code which manages CPU resources, will call this code, and the
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* end-device drivers will make upcalls to that code to actually perform
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* the allocation.
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*
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* There are two sorts of resources managed by this code. The first is
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* the more familiar array (RMAN_ARRAY) type; resources in this class
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* consist of a sequence of individually-allocatable objects which have
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* been numbered in some well-defined order. Most of the resources
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* are of this type, as it is the most familiar. The second type is
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* called a gauge (RMAN_GAUGE), and models fungible resources (i.e.,
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* resources in which each instance is indistinguishable from every
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* other instance). The principal anticipated application of gauges
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* is in the context of power consumption, where a bus may have a specific
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* power budget which all attached devices share. RMAN_GAUGE is not
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* implemented yet.
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*
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* For array resources, we make one simplifying assumption: two clients
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* sharing the same resource must use the same range of indices. That
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* is to say, sharing of overlapping-but-not-identical regions is not
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* permitted.
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*/
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#include "opt_ddb.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/bus.h> /* XXX debugging */
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <sys/sysctl.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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/*
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* We use a linked list rather than a bitmap because we need to be able to
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* represent potentially huge objects (like all of a processor's physical
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* address space). That is also why the indices are defined to have type
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* `unsigned long' -- that being the largest integral type in ISO C (1990).
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* The 1999 version of C allows `long long'; we may need to switch to that
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* at some point in the future, particularly if we want to support 36-bit
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* addresses on IA32 hardware.
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*/
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struct resource_i {
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struct resource r_r;
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TAILQ_ENTRY(resource_i) r_link;
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LIST_ENTRY(resource_i) r_sharelink;
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LIST_HEAD(, resource_i) *r_sharehead;
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u_long r_start; /* index of the first entry in this resource */
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u_long r_end; /* index of the last entry (inclusive) */
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u_int r_flags;
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void *r_virtual; /* virtual address of this resource */
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struct device *r_dev; /* device which has allocated this resource */
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struct rman *r_rm; /* resource manager from whence this came */
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int r_rid; /* optional rid for this resource. */
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};
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static int rman_debug = 0;
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TUNABLE_INT("debug.rman_debug", &rman_debug);
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SYSCTL_INT(_debug, OID_AUTO, rman_debug, CTLFLAG_RW,
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&rman_debug, 0, "rman debug");
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#define DPRINTF(params) if (rman_debug) printf params
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static MALLOC_DEFINE(M_RMAN, "rman", "Resource manager");
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struct rman_head rman_head;
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static struct mtx rman_mtx; /* mutex to protect rman_head */
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static int int_rman_activate_resource(struct rman *rm, struct resource_i *r,
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struct resource_i **whohas);
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static int int_rman_deactivate_resource(struct resource_i *r);
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static int int_rman_release_resource(struct rman *rm, struct resource_i *r);
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static __inline struct resource_i *
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int_alloc_resource(int malloc_flag)
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{
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struct resource_i *r;
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r = malloc(sizeof *r, M_RMAN, malloc_flag | M_ZERO);
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if (r != NULL) {
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r->r_r.__r_i = r;
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}
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return (r);
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}
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int
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rman_init(struct rman *rm)
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{
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static int once = 0;
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if (once == 0) {
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once = 1;
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TAILQ_INIT(&rman_head);
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mtx_init(&rman_mtx, "rman head", NULL, MTX_DEF);
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}
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if (rm->rm_start == 0 && rm->rm_end == 0)
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rm->rm_end = ~0ul;
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if (rm->rm_type == RMAN_UNINIT)
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panic("rman_init");
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if (rm->rm_type == RMAN_GAUGE)
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panic("implement RMAN_GAUGE");
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TAILQ_INIT(&rm->rm_list);
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rm->rm_mtx = malloc(sizeof *rm->rm_mtx, M_RMAN, M_NOWAIT | M_ZERO);
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if (rm->rm_mtx == NULL)
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return ENOMEM;
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mtx_init(rm->rm_mtx, "rman", NULL, MTX_DEF);
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mtx_lock(&rman_mtx);
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TAILQ_INSERT_TAIL(&rman_head, rm, rm_link);
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mtx_unlock(&rman_mtx);
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return 0;
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}
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int
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rman_manage_region(struct rman *rm, u_long start, u_long end)
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{
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struct resource_i *r, *s, *t;
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int rv = 0;
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DPRINTF(("rman_manage_region: <%s> request: start %#lx, end %#lx\n",
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rm->rm_descr, start, end));
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if (start < rm->rm_start || end > rm->rm_end)
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return EINVAL;
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r = int_alloc_resource(M_NOWAIT);
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if (r == NULL)
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return ENOMEM;
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r->r_start = start;
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r->r_end = end;
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r->r_rm = rm;
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mtx_lock(rm->rm_mtx);
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/* Skip entries before us. */
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TAILQ_FOREACH(s, &rm->rm_list, r_link) {
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if (s->r_end == ULONG_MAX)
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break;
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if (s->r_end + 1 >= r->r_start)
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break;
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}
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/* If we ran off the end of the list, insert at the tail. */
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if (s == NULL) {
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TAILQ_INSERT_TAIL(&rm->rm_list, r, r_link);
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} else {
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/* Check for any overlap with the current region. */
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if (r->r_start <= s->r_end && r->r_end >= s->r_start) {
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rv = EBUSY;
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goto out;
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}
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/* Check for any overlap with the next region. */
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t = TAILQ_NEXT(s, r_link);
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if (t && r->r_start <= t->r_end && r->r_end >= t->r_start) {
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rv = EBUSY;
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goto out;
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}
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/*
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* See if this region can be merged with the next region. If
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* not, clear the pointer.
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*/
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if (t && (r->r_end + 1 != t->r_start || t->r_flags != 0))
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t = NULL;
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/* See if we can merge with the current region. */
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if (s->r_end + 1 == r->r_start && s->r_flags == 0) {
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/* Can we merge all 3 regions? */
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if (t != NULL) {
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s->r_end = t->r_end;
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TAILQ_REMOVE(&rm->rm_list, t, r_link);
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free(r, M_RMAN);
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free(t, M_RMAN);
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} else {
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s->r_end = r->r_end;
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free(r, M_RMAN);
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}
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} else if (t != NULL) {
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/* Can we merge with just the next region? */
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t->r_start = r->r_start;
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free(r, M_RMAN);
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} else if (s->r_end < r->r_start) {
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TAILQ_INSERT_AFTER(&rm->rm_list, s, r, r_link);
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} else {
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TAILQ_INSERT_BEFORE(s, r, r_link);
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}
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}
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out:
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mtx_unlock(rm->rm_mtx);
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return rv;
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}
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int
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rman_init_from_resource(struct rman *rm, struct resource *r)
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{
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int rv;
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if ((rv = rman_init(rm)) != 0)
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return (rv);
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return (rman_manage_region(rm, r->__r_i->r_start, r->__r_i->r_end));
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}
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int
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rman_fini(struct rman *rm)
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{
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struct resource_i *r;
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mtx_lock(rm->rm_mtx);
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TAILQ_FOREACH(r, &rm->rm_list, r_link) {
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if (r->r_flags & RF_ALLOCATED) {
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mtx_unlock(rm->rm_mtx);
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return EBUSY;
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}
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}
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/*
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* There really should only be one of these if we are in this
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* state and the code is working properly, but it can't hurt.
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*/
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while (!TAILQ_EMPTY(&rm->rm_list)) {
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r = TAILQ_FIRST(&rm->rm_list);
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TAILQ_REMOVE(&rm->rm_list, r, r_link);
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free(r, M_RMAN);
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}
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mtx_unlock(rm->rm_mtx);
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mtx_lock(&rman_mtx);
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TAILQ_REMOVE(&rman_head, rm, rm_link);
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mtx_unlock(&rman_mtx);
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mtx_destroy(rm->rm_mtx);
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free(rm->rm_mtx, M_RMAN);
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return 0;
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}
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int
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rman_first_free_region(struct rman *rm, u_long *start, u_long *end)
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{
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struct resource_i *r;
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mtx_lock(rm->rm_mtx);
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TAILQ_FOREACH(r, &rm->rm_list, r_link) {
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if (!(r->r_flags & RF_ALLOCATED)) {
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*start = r->r_start;
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*end = r->r_end;
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mtx_unlock(rm->rm_mtx);
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return (0);
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}
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}
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mtx_unlock(rm->rm_mtx);
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return (ENOENT);
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}
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int
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rman_last_free_region(struct rman *rm, u_long *start, u_long *end)
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{
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struct resource_i *r;
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mtx_lock(rm->rm_mtx);
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TAILQ_FOREACH_REVERSE(r, &rm->rm_list, resource_head, r_link) {
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if (!(r->r_flags & RF_ALLOCATED)) {
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*start = r->r_start;
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*end = r->r_end;
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mtx_unlock(rm->rm_mtx);
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return (0);
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}
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}
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mtx_unlock(rm->rm_mtx);
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return (ENOENT);
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}
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/* Shrink or extend one or both ends of an allocated resource. */
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int
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rman_adjust_resource(struct resource *rr, u_long start, u_long end)
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{
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struct resource_i *r, *s, *t, *new;
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struct rman *rm;
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/* Not supported for shared resources. */
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r = rr->__r_i;
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if (r->r_flags & (RF_TIMESHARE | RF_SHAREABLE))
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return (EINVAL);
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/*
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* This does not support wholesale moving of a resource. At
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* least part of the desired new range must overlap with the
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* existing resource.
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*/
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if (end < r->r_start || r->r_end < start)
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return (EINVAL);
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/*
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* Find the two resource regions immediately adjacent to the
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* allocated resource.
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*/
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rm = r->r_rm;
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mtx_lock(rm->rm_mtx);
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#ifdef INVARIANTS
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TAILQ_FOREACH(s, &rm->rm_list, r_link) {
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if (s == r)
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break;
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}
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if (s == NULL)
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panic("resource not in list");
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#endif
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s = TAILQ_PREV(r, resource_head, r_link);
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t = TAILQ_NEXT(r, r_link);
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KASSERT(s == NULL || s->r_end + 1 == r->r_start,
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("prev resource mismatch"));
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KASSERT(t == NULL || r->r_end + 1 == t->r_start,
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("next resource mismatch"));
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/*
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* See if the changes are permitted. Shrinking is always allowed,
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* but growing requires sufficient room in the adjacent region.
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*/
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if (start < r->r_start && (s == NULL || (s->r_flags & RF_ALLOCATED) ||
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s->r_start > start)) {
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mtx_unlock(rm->rm_mtx);
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return (EBUSY);
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}
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if (end > r->r_end && (t == NULL || (t->r_flags & RF_ALLOCATED) ||
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t->r_end < end)) {
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mtx_unlock(rm->rm_mtx);
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return (EBUSY);
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}
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|
|
|
/*
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* While holding the lock, grow either end of the resource as
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* needed and shrink either end if the shrinking does not require
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* allocating a new resource. We can safely drop the lock and then
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* insert a new range to handle the shrinking case afterwards.
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*/
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if (start < r->r_start ||
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(start > r->r_start && s != NULL && !(s->r_flags & RF_ALLOCATED))) {
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KASSERT(s->r_flags == 0, ("prev is busy"));
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r->r_start = start;
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if (s->r_start == start) {
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TAILQ_REMOVE(&rm->rm_list, s, r_link);
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free(s, M_RMAN);
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} else
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s->r_end = start - 1;
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}
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if (end > r->r_end ||
|
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(end < r->r_end && t != NULL && !(t->r_flags & RF_ALLOCATED))) {
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KASSERT(t->r_flags == 0, ("next is busy"));
|
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r->r_end = end;
|
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if (t->r_end == end) {
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TAILQ_REMOVE(&rm->rm_list, t, r_link);
|
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free(t, M_RMAN);
|
|
} else
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t->r_start = end + 1;
|
|
}
|
|
mtx_unlock(rm->rm_mtx);
|
|
|
|
/*
|
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* Handle the shrinking cases that require allocating a new
|
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* resource to hold the newly-free region. We have to recheck
|
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* if we still need this new region after acquiring the lock.
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|
*/
|
|
if (start > r->r_start) {
|
|
new = int_alloc_resource(M_WAITOK);
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new->r_start = r->r_start;
|
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new->r_end = start - 1;
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new->r_rm = rm;
|
|
mtx_lock(rm->rm_mtx);
|
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r->r_start = start;
|
|
s = TAILQ_PREV(r, resource_head, r_link);
|
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if (s != NULL && !(s->r_flags & RF_ALLOCATED)) {
|
|
s->r_end = start - 1;
|
|
free(new, M_RMAN);
|
|
} else
|
|
TAILQ_INSERT_BEFORE(r, new, r_link);
|
|
mtx_unlock(rm->rm_mtx);
|
|
}
|
|
if (end < r->r_end) {
|
|
new = int_alloc_resource(M_WAITOK);
|
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new->r_start = end + 1;
|
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new->r_end = r->r_end;
|
|
new->r_rm = rm;
|
|
mtx_lock(rm->rm_mtx);
|
|
r->r_end = end;
|
|
t = TAILQ_NEXT(r, r_link);
|
|
if (t != NULL && !(t->r_flags & RF_ALLOCATED)) {
|
|
t->r_start = end + 1;
|
|
free(new, M_RMAN);
|
|
} else
|
|
TAILQ_INSERT_AFTER(&rm->rm_list, r, new, r_link);
|
|
mtx_unlock(rm->rm_mtx);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#define SHARE_TYPE(f) (f & (RF_SHAREABLE | RF_TIMESHARE | RF_PREFETCHABLE))
|
|
|
|
struct resource *
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|
rman_reserve_resource_bound(struct rman *rm, u_long start, u_long end,
|
|
u_long count, u_long bound, u_int flags,
|
|
struct device *dev)
|
|
{
|
|
u_int new_rflags;
|
|
struct resource_i *r, *s, *rv;
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|
u_long rstart, rend, amask, bmask;
|
|
|
|
rv = NULL;
|
|
|
|
DPRINTF(("rman_reserve_resource_bound: <%s> request: [%#lx, %#lx], "
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|
"length %#lx, flags %u, device %s\n", rm->rm_descr, start, end,
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count, flags,
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dev == NULL ? "<null>" : device_get_nameunit(dev)));
|
|
KASSERT((flags & (RF_WANTED | RF_FIRSTSHARE)) == 0,
|
|
("invalid flags %#x", flags));
|
|
new_rflags = (flags & ~(RF_ACTIVE | RF_WANTED | RF_FIRSTSHARE)) |
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|
RF_ALLOCATED;
|
|
|
|
mtx_lock(rm->rm_mtx);
|
|
|
|
for (r = TAILQ_FIRST(&rm->rm_list);
|
|
r && r->r_end < start + count - 1;
|
|
r = TAILQ_NEXT(r, r_link))
|
|
;
|
|
|
|
if (r == NULL) {
|
|
DPRINTF(("could not find a region\n"));
|
|
goto out;
|
|
}
|
|
|
|
amask = (1ul << RF_ALIGNMENT(flags)) - 1;
|
|
KASSERT(start <= ULONG_MAX - amask,
|
|
("start (%#lx) + amask (%#lx) would wrap around", start, amask));
|
|
|
|
/* If bound is 0, bmask will also be 0 */
|
|
bmask = ~(bound - 1);
|
|
/*
|
|
* First try to find an acceptable totally-unshared region.
|
|
*/
|
|
for (s = r; s; s = TAILQ_NEXT(s, r_link)) {
|
|
DPRINTF(("considering [%#lx, %#lx]\n", s->r_start, s->r_end));
|
|
/*
|
|
* The resource list is sorted, so there is no point in
|
|
* searching further once r_start is too large.
|
|
*/
|
|
if (s->r_start > end - (count - 1)) {
|
|
DPRINTF(("s->r_start (%#lx) + count - 1> end (%#lx)\n",
|
|
s->r_start, end));
|
|
break;
|
|
}
|
|
if (s->r_start > ULONG_MAX - amask) {
|
|
DPRINTF(("s->r_start (%#lx) + amask (%#lx) too large\n",
|
|
s->r_start, amask));
|
|
break;
|
|
}
|
|
if (s->r_flags & RF_ALLOCATED) {
|
|
DPRINTF(("region is allocated\n"));
|
|
continue;
|
|
}
|
|
rstart = ulmax(s->r_start, start);
|
|
/*
|
|
* Try to find a region by adjusting to boundary and alignment
|
|
* until both conditions are satisfied. This is not an optimal
|
|
* algorithm, but in most cases it isn't really bad, either.
|
|
*/
|
|
do {
|
|
rstart = (rstart + amask) & ~amask;
|
|
if (((rstart ^ (rstart + count - 1)) & bmask) != 0)
|
|
rstart += bound - (rstart & ~bmask);
|
|
} while ((rstart & amask) != 0 && rstart < end &&
|
|
rstart < s->r_end);
|
|
rend = ulmin(s->r_end, ulmax(rstart + count - 1, end));
|
|
if (rstart > rend) {
|
|
DPRINTF(("adjusted start exceeds end\n"));
|
|
continue;
|
|
}
|
|
DPRINTF(("truncated region: [%#lx, %#lx]; size %#lx (requested %#lx)\n",
|
|
rstart, rend, (rend - rstart + 1), count));
|
|
|
|
if ((rend - rstart + 1) >= count) {
|
|
DPRINTF(("candidate region: [%#lx, %#lx], size %#lx\n",
|
|
rstart, rend, (rend - rstart + 1)));
|
|
if ((s->r_end - s->r_start + 1) == count) {
|
|
DPRINTF(("candidate region is entire chunk\n"));
|
|
rv = s;
|
|
rv->r_flags = new_rflags;
|
|
rv->r_dev = dev;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If s->r_start < rstart and
|
|
* s->r_end > rstart + count - 1, then
|
|
* we need to split the region into three pieces
|
|
* (the middle one will get returned to the user).
|
|
* Otherwise, we are allocating at either the
|
|
* beginning or the end of s, so we only need to
|
|
* split it in two. The first case requires
|
|
* two new allocations; the second requires but one.
|
|
*/
|
|
rv = int_alloc_resource(M_NOWAIT);
|
|
if (rv == NULL)
|
|
goto out;
|
|
rv->r_start = rstart;
|
|
rv->r_end = rstart + count - 1;
|
|
rv->r_flags = new_rflags;
|
|
rv->r_dev = dev;
|
|
rv->r_rm = rm;
|
|
|
|
if (s->r_start < rv->r_start && s->r_end > rv->r_end) {
|
|
DPRINTF(("splitting region in three parts: "
|
|
"[%#lx, %#lx]; [%#lx, %#lx]; [%#lx, %#lx]\n",
|
|
s->r_start, rv->r_start - 1,
|
|
rv->r_start, rv->r_end,
|
|
rv->r_end + 1, s->r_end));
|
|
/*
|
|
* We are allocating in the middle.
|
|
*/
|
|
r = int_alloc_resource(M_NOWAIT);
|
|
if (r == NULL) {
|
|
free(rv, M_RMAN);
|
|
rv = NULL;
|
|
goto out;
|
|
}
|
|
r->r_start = rv->r_end + 1;
|
|
r->r_end = s->r_end;
|
|
r->r_flags = s->r_flags;
|
|
r->r_rm = rm;
|
|
s->r_end = rv->r_start - 1;
|
|
TAILQ_INSERT_AFTER(&rm->rm_list, s, rv,
|
|
r_link);
|
|
TAILQ_INSERT_AFTER(&rm->rm_list, rv, r,
|
|
r_link);
|
|
} else if (s->r_start == rv->r_start) {
|
|
DPRINTF(("allocating from the beginning\n"));
|
|
/*
|
|
* We are allocating at the beginning.
|
|
*/
|
|
s->r_start = rv->r_end + 1;
|
|
TAILQ_INSERT_BEFORE(s, rv, r_link);
|
|
} else {
|
|
DPRINTF(("allocating at the end\n"));
|
|
/*
|
|
* We are allocating at the end.
|
|
*/
|
|
s->r_end = rv->r_start - 1;
|
|
TAILQ_INSERT_AFTER(&rm->rm_list, s, rv,
|
|
r_link);
|
|
}
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now find an acceptable shared region, if the client's requirements
|
|
* allow sharing. By our implementation restriction, a candidate
|
|
* region must match exactly by both size and sharing type in order
|
|
* to be considered compatible with the client's request. (The
|
|
* former restriction could probably be lifted without too much
|
|
* additional work, but this does not seem warranted.)
|
|
*/
|
|
DPRINTF(("no unshared regions found\n"));
|
|
if ((flags & (RF_SHAREABLE | RF_TIMESHARE)) == 0)
|
|
goto out;
|
|
|
|
for (s = r; s && s->r_end <= end; s = TAILQ_NEXT(s, r_link)) {
|
|
if (SHARE_TYPE(s->r_flags) == SHARE_TYPE(flags) &&
|
|
s->r_start >= start &&
|
|
(s->r_end - s->r_start + 1) == count &&
|
|
(s->r_start & amask) == 0 &&
|
|
((s->r_start ^ s->r_end) & bmask) == 0) {
|
|
rv = int_alloc_resource(M_NOWAIT);
|
|
if (rv == NULL)
|
|
goto out;
|
|
rv->r_start = s->r_start;
|
|
rv->r_end = s->r_end;
|
|
rv->r_flags = new_rflags;
|
|
rv->r_dev = dev;
|
|
rv->r_rm = rm;
|
|
if (s->r_sharehead == NULL) {
|
|
s->r_sharehead = malloc(sizeof *s->r_sharehead,
|
|
M_RMAN, M_NOWAIT | M_ZERO);
|
|
if (s->r_sharehead == NULL) {
|
|
free(rv, M_RMAN);
|
|
rv = NULL;
|
|
goto out;
|
|
}
|
|
LIST_INIT(s->r_sharehead);
|
|
LIST_INSERT_HEAD(s->r_sharehead, s,
|
|
r_sharelink);
|
|
s->r_flags |= RF_FIRSTSHARE;
|
|
}
|
|
rv->r_sharehead = s->r_sharehead;
|
|
LIST_INSERT_HEAD(s->r_sharehead, rv, r_sharelink);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We couldn't find anything.
|
|
*/
|
|
out:
|
|
/*
|
|
* If the user specified RF_ACTIVE in flags, we attempt to atomically
|
|
* activate the resource. If this fails, we release the resource
|
|
* and indicate overall failure. (This behavior probably doesn't
|
|
* make sense for RF_TIMESHARE-type resources.)
|
|
*/
|
|
if (rv && (flags & RF_ACTIVE) != 0) {
|
|
struct resource_i *whohas;
|
|
if (int_rman_activate_resource(rm, rv, &whohas)) {
|
|
int_rman_release_resource(rm, rv);
|
|
rv = NULL;
|
|
}
|
|
}
|
|
|
|
mtx_unlock(rm->rm_mtx);
|
|
return (rv == NULL ? NULL : &rv->r_r);
|
|
}
|
|
|
|
struct resource *
|
|
rman_reserve_resource(struct rman *rm, u_long start, u_long end, u_long count,
|
|
u_int flags, struct device *dev)
|
|
{
|
|
|
|
return (rman_reserve_resource_bound(rm, start, end, count, 0, flags,
|
|
dev));
|
|
}
|
|
|
|
static int
|
|
int_rman_activate_resource(struct rman *rm, struct resource_i *r,
|
|
struct resource_i **whohas)
|
|
{
|
|
struct resource_i *s;
|
|
int ok;
|
|
|
|
/*
|
|
* If we are not timesharing, then there is nothing much to do.
|
|
* If we already have the resource, then there is nothing at all to do.
|
|
* If we are not on a sharing list with anybody else, then there is
|
|
* little to do.
|
|
*/
|
|
if ((r->r_flags & RF_TIMESHARE) == 0
|
|
|| (r->r_flags & RF_ACTIVE) != 0
|
|
|| r->r_sharehead == NULL) {
|
|
r->r_flags |= RF_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
ok = 1;
|
|
for (s = LIST_FIRST(r->r_sharehead); s && ok;
|
|
s = LIST_NEXT(s, r_sharelink)) {
|
|
if ((s->r_flags & RF_ACTIVE) != 0) {
|
|
ok = 0;
|
|
*whohas = s;
|
|
}
|
|
}
|
|
if (ok) {
|
|
r->r_flags |= RF_ACTIVE;
|
|
return 0;
|
|
}
|
|
return EBUSY;
|
|
}
|
|
|
|
int
|
|
rman_activate_resource(struct resource *re)
|
|
{
|
|
int rv;
|
|
struct resource_i *r, *whohas;
|
|
struct rman *rm;
|
|
|
|
r = re->__r_i;
|
|
rm = r->r_rm;
|
|
mtx_lock(rm->rm_mtx);
|
|
rv = int_rman_activate_resource(rm, r, &whohas);
|
|
mtx_unlock(rm->rm_mtx);
|
|
return rv;
|
|
}
|
|
|
|
int
|
|
rman_await_resource(struct resource *re, int pri, int timo)
|
|
{
|
|
int rv;
|
|
struct resource_i *r, *whohas;
|
|
struct rman *rm;
|
|
|
|
r = re->__r_i;
|
|
rm = r->r_rm;
|
|
mtx_lock(rm->rm_mtx);
|
|
for (;;) {
|
|
rv = int_rman_activate_resource(rm, r, &whohas);
|
|
if (rv != EBUSY)
|
|
return (rv); /* returns with mutex held */
|
|
|
|
if (r->r_sharehead == NULL)
|
|
panic("rman_await_resource");
|
|
whohas->r_flags |= RF_WANTED;
|
|
rv = msleep(r->r_sharehead, rm->rm_mtx, pri, "rmwait", timo);
|
|
if (rv) {
|
|
mtx_unlock(rm->rm_mtx);
|
|
return (rv);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
int_rman_deactivate_resource(struct resource_i *r)
|
|
{
|
|
|
|
r->r_flags &= ~RF_ACTIVE;
|
|
if (r->r_flags & RF_WANTED) {
|
|
r->r_flags &= ~RF_WANTED;
|
|
wakeup(r->r_sharehead);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
rman_deactivate_resource(struct resource *r)
|
|
{
|
|
struct rman *rm;
|
|
|
|
rm = r->__r_i->r_rm;
|
|
mtx_lock(rm->rm_mtx);
|
|
int_rman_deactivate_resource(r->__r_i);
|
|
mtx_unlock(rm->rm_mtx);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
int_rman_release_resource(struct rman *rm, struct resource_i *r)
|
|
{
|
|
struct resource_i *s, *t;
|
|
|
|
if (r->r_flags & RF_ACTIVE)
|
|
int_rman_deactivate_resource(r);
|
|
|
|
/*
|
|
* Check for a sharing list first. If there is one, then we don't
|
|
* have to think as hard.
|
|
*/
|
|
if (r->r_sharehead) {
|
|
/*
|
|
* If a sharing list exists, then we know there are at
|
|
* least two sharers.
|
|
*
|
|
* If we are in the main circleq, appoint someone else.
|
|
*/
|
|
LIST_REMOVE(r, r_sharelink);
|
|
s = LIST_FIRST(r->r_sharehead);
|
|
if (r->r_flags & RF_FIRSTSHARE) {
|
|
s->r_flags |= RF_FIRSTSHARE;
|
|
TAILQ_INSERT_BEFORE(r, s, r_link);
|
|
TAILQ_REMOVE(&rm->rm_list, r, r_link);
|
|
}
|
|
|
|
/*
|
|
* Make sure that the sharing list goes away completely
|
|
* if the resource is no longer being shared at all.
|
|
*/
|
|
if (LIST_NEXT(s, r_sharelink) == NULL) {
|
|
free(s->r_sharehead, M_RMAN);
|
|
s->r_sharehead = NULL;
|
|
s->r_flags &= ~RF_FIRSTSHARE;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Look at the adjacent resources in the list and see if our
|
|
* segment can be merged with any of them. If either of the
|
|
* resources is allocated or is not exactly adjacent then they
|
|
* cannot be merged with our segment.
|
|
*/
|
|
s = TAILQ_PREV(r, resource_head, r_link);
|
|
if (s != NULL && ((s->r_flags & RF_ALLOCATED) != 0 ||
|
|
s->r_end + 1 != r->r_start))
|
|
s = NULL;
|
|
t = TAILQ_NEXT(r, r_link);
|
|
if (t != NULL && ((t->r_flags & RF_ALLOCATED) != 0 ||
|
|
r->r_end + 1 != t->r_start))
|
|
t = NULL;
|
|
|
|
if (s != NULL && t != NULL) {
|
|
/*
|
|
* Merge all three segments.
|
|
*/
|
|
s->r_end = t->r_end;
|
|
TAILQ_REMOVE(&rm->rm_list, r, r_link);
|
|
TAILQ_REMOVE(&rm->rm_list, t, r_link);
|
|
free(t, M_RMAN);
|
|
} else if (s != NULL) {
|
|
/*
|
|
* Merge previous segment with ours.
|
|
*/
|
|
s->r_end = r->r_end;
|
|
TAILQ_REMOVE(&rm->rm_list, r, r_link);
|
|
} else if (t != NULL) {
|
|
/*
|
|
* Merge next segment with ours.
|
|
*/
|
|
t->r_start = r->r_start;
|
|
TAILQ_REMOVE(&rm->rm_list, r, r_link);
|
|
} else {
|
|
/*
|
|
* At this point, we know there is nothing we
|
|
* can potentially merge with, because on each
|
|
* side, there is either nothing there or what is
|
|
* there is still allocated. In that case, we don't
|
|
* want to remove r from the list; we simply want to
|
|
* change it to an unallocated region and return
|
|
* without freeing anything.
|
|
*/
|
|
r->r_flags &= ~RF_ALLOCATED;
|
|
r->r_dev = NULL;
|
|
return 0;
|
|
}
|
|
|
|
out:
|
|
free(r, M_RMAN);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
rman_release_resource(struct resource *re)
|
|
{
|
|
int rv;
|
|
struct resource_i *r;
|
|
struct rman *rm;
|
|
|
|
r = re->__r_i;
|
|
rm = r->r_rm;
|
|
mtx_lock(rm->rm_mtx);
|
|
rv = int_rman_release_resource(rm, r);
|
|
mtx_unlock(rm->rm_mtx);
|
|
return (rv);
|
|
}
|
|
|
|
uint32_t
|
|
rman_make_alignment_flags(uint32_t size)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* Find the hightest bit set, and add one if more than one bit
|
|
* set. We're effectively computing the ceil(log2(size)) here.
|
|
*/
|
|
for (i = 31; i > 0; i--)
|
|
if ((1 << i) & size)
|
|
break;
|
|
if (~(1 << i) & size)
|
|
i++;
|
|
|
|
return(RF_ALIGNMENT_LOG2(i));
|
|
}
|
|
|
|
void
|
|
rman_set_start(struct resource *r, u_long start)
|
|
{
|
|
r->__r_i->r_start = start;
|
|
}
|
|
|
|
u_long
|
|
rman_get_start(struct resource *r)
|
|
{
|
|
return (r->__r_i->r_start);
|
|
}
|
|
|
|
void
|
|
rman_set_end(struct resource *r, u_long end)
|
|
{
|
|
r->__r_i->r_end = end;
|
|
}
|
|
|
|
u_long
|
|
rman_get_end(struct resource *r)
|
|
{
|
|
return (r->__r_i->r_end);
|
|
}
|
|
|
|
u_long
|
|
rman_get_size(struct resource *r)
|
|
{
|
|
return (r->__r_i->r_end - r->__r_i->r_start + 1);
|
|
}
|
|
|
|
u_int
|
|
rman_get_flags(struct resource *r)
|
|
{
|
|
return (r->__r_i->r_flags);
|
|
}
|
|
|
|
void
|
|
rman_set_virtual(struct resource *r, void *v)
|
|
{
|
|
r->__r_i->r_virtual = v;
|
|
}
|
|
|
|
void *
|
|
rman_get_virtual(struct resource *r)
|
|
{
|
|
return (r->__r_i->r_virtual);
|
|
}
|
|
|
|
void
|
|
rman_set_bustag(struct resource *r, bus_space_tag_t t)
|
|
{
|
|
r->r_bustag = t;
|
|
}
|
|
|
|
bus_space_tag_t
|
|
rman_get_bustag(struct resource *r)
|
|
{
|
|
return (r->r_bustag);
|
|
}
|
|
|
|
void
|
|
rman_set_bushandle(struct resource *r, bus_space_handle_t h)
|
|
{
|
|
r->r_bushandle = h;
|
|
}
|
|
|
|
bus_space_handle_t
|
|
rman_get_bushandle(struct resource *r)
|
|
{
|
|
return (r->r_bushandle);
|
|
}
|
|
|
|
void
|
|
rman_set_rid(struct resource *r, int rid)
|
|
{
|
|
r->__r_i->r_rid = rid;
|
|
}
|
|
|
|
int
|
|
rman_get_rid(struct resource *r)
|
|
{
|
|
return (r->__r_i->r_rid);
|
|
}
|
|
|
|
void
|
|
rman_set_device(struct resource *r, struct device *dev)
|
|
{
|
|
r->__r_i->r_dev = dev;
|
|
}
|
|
|
|
struct device *
|
|
rman_get_device(struct resource *r)
|
|
{
|
|
return (r->__r_i->r_dev);
|
|
}
|
|
|
|
int
|
|
rman_is_region_manager(struct resource *r, struct rman *rm)
|
|
{
|
|
|
|
return (r->__r_i->r_rm == rm);
|
|
}
|
|
|
|
/*
|
|
* Sysctl interface for scanning the resource lists.
|
|
*
|
|
* We take two input parameters; the index into the list of resource
|
|
* managers, and the resource offset into the list.
|
|
*/
|
|
static int
|
|
sysctl_rman(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int *name = (int *)arg1;
|
|
u_int namelen = arg2;
|
|
int rman_idx, res_idx;
|
|
struct rman *rm;
|
|
struct resource_i *res;
|
|
struct resource_i *sres;
|
|
struct u_rman urm;
|
|
struct u_resource ures;
|
|
int error;
|
|
|
|
if (namelen != 3)
|
|
return (EINVAL);
|
|
|
|
if (bus_data_generation_check(name[0]))
|
|
return (EINVAL);
|
|
rman_idx = name[1];
|
|
res_idx = name[2];
|
|
|
|
/*
|
|
* Find the indexed resource manager
|
|
*/
|
|
mtx_lock(&rman_mtx);
|
|
TAILQ_FOREACH(rm, &rman_head, rm_link) {
|
|
if (rman_idx-- == 0)
|
|
break;
|
|
}
|
|
mtx_unlock(&rman_mtx);
|
|
if (rm == NULL)
|
|
return (ENOENT);
|
|
|
|
/*
|
|
* If the resource index is -1, we want details on the
|
|
* resource manager.
|
|
*/
|
|
if (res_idx == -1) {
|
|
bzero(&urm, sizeof(urm));
|
|
urm.rm_handle = (uintptr_t)rm;
|
|
if (rm->rm_descr != NULL)
|
|
strlcpy(urm.rm_descr, rm->rm_descr, RM_TEXTLEN);
|
|
urm.rm_start = rm->rm_start;
|
|
urm.rm_size = rm->rm_end - rm->rm_start + 1;
|
|
urm.rm_type = rm->rm_type;
|
|
|
|
error = SYSCTL_OUT(req, &urm, sizeof(urm));
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Find the indexed resource and return it.
|
|
*/
|
|
mtx_lock(rm->rm_mtx);
|
|
TAILQ_FOREACH(res, &rm->rm_list, r_link) {
|
|
if (res->r_sharehead != NULL) {
|
|
LIST_FOREACH(sres, res->r_sharehead, r_sharelink)
|
|
if (res_idx-- == 0) {
|
|
res = sres;
|
|
goto found;
|
|
}
|
|
}
|
|
else if (res_idx-- == 0)
|
|
goto found;
|
|
}
|
|
mtx_unlock(rm->rm_mtx);
|
|
return (ENOENT);
|
|
|
|
found:
|
|
bzero(&ures, sizeof(ures));
|
|
ures.r_handle = (uintptr_t)res;
|
|
ures.r_parent = (uintptr_t)res->r_rm;
|
|
ures.r_device = (uintptr_t)res->r_dev;
|
|
if (res->r_dev != NULL) {
|
|
if (device_get_name(res->r_dev) != NULL) {
|
|
snprintf(ures.r_devname, RM_TEXTLEN,
|
|
"%s%d",
|
|
device_get_name(res->r_dev),
|
|
device_get_unit(res->r_dev));
|
|
} else {
|
|
strlcpy(ures.r_devname, "nomatch",
|
|
RM_TEXTLEN);
|
|
}
|
|
} else {
|
|
ures.r_devname[0] = '\0';
|
|
}
|
|
ures.r_start = res->r_start;
|
|
ures.r_size = res->r_end - res->r_start + 1;
|
|
ures.r_flags = res->r_flags;
|
|
|
|
mtx_unlock(rm->rm_mtx);
|
|
error = SYSCTL_OUT(req, &ures, sizeof(ures));
|
|
return (error);
|
|
}
|
|
|
|
static SYSCTL_NODE(_hw_bus, OID_AUTO, rman, CTLFLAG_RD, sysctl_rman,
|
|
"kernel resource manager");
|
|
|
|
#ifdef DDB
|
|
static void
|
|
dump_rman_header(struct rman *rm)
|
|
{
|
|
|
|
if (db_pager_quit)
|
|
return;
|
|
db_printf("rman %p: %s (0x%lx-0x%lx full range)\n",
|
|
rm, rm->rm_descr, rm->rm_start, rm->rm_end);
|
|
}
|
|
|
|
static void
|
|
dump_rman(struct rman *rm)
|
|
{
|
|
struct resource_i *r;
|
|
const char *devname;
|
|
|
|
if (db_pager_quit)
|
|
return;
|
|
TAILQ_FOREACH(r, &rm->rm_list, r_link) {
|
|
if (r->r_dev != NULL) {
|
|
devname = device_get_nameunit(r->r_dev);
|
|
if (devname == NULL)
|
|
devname = "nomatch";
|
|
} else
|
|
devname = NULL;
|
|
db_printf(" 0x%lx-0x%lx ", r->r_start, r->r_end);
|
|
if (devname != NULL)
|
|
db_printf("(%s)\n", devname);
|
|
else
|
|
db_printf("----\n");
|
|
if (db_pager_quit)
|
|
return;
|
|
}
|
|
}
|
|
|
|
DB_SHOW_COMMAND(rman, db_show_rman)
|
|
{
|
|
|
|
if (have_addr) {
|
|
dump_rman_header((struct rman *)addr);
|
|
dump_rman((struct rman *)addr);
|
|
}
|
|
}
|
|
|
|
DB_SHOW_COMMAND(rmans, db_show_rmans)
|
|
{
|
|
struct rman *rm;
|
|
|
|
TAILQ_FOREACH(rm, &rman_head, rm_link) {
|
|
dump_rman_header(rm);
|
|
}
|
|
}
|
|
|
|
DB_SHOW_ALL_COMMAND(rman, db_show_all_rman)
|
|
{
|
|
struct rman *rm;
|
|
|
|
TAILQ_FOREACH(rm, &rman_head, rm_link) {
|
|
dump_rman_header(rm);
|
|
dump_rman(rm);
|
|
}
|
|
}
|
|
DB_SHOW_ALIAS(allrman, db_show_all_rman);
|
|
#endif
|