2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
5 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
6 * Copyright (c) 2000 BSDi
9 * Redistribution and use in source and binary forms, with or without
10 * 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 the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 * PCI:PCI bridge support.
42 #include <sys/param.h>
44 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/module.h>
48 #include <sys/mutex.h>
49 #include <sys/pciio.h>
51 #include <sys/sysctl.h>
52 #include <sys/systm.h>
53 #include <sys/taskqueue.h>
55 #include <dev/pci/pcivar.h>
56 #include <dev/pci/pcireg.h>
57 #include <dev/pci/pci_private.h>
58 #include <dev/pci/pcib_private.h>
62 static int pcib_probe(device_t dev);
63 static int pcib_suspend(device_t dev);
64 static int pcib_resume(device_t dev);
65 static int pcib_power_for_sleep(device_t pcib, device_t dev,
67 static int pcib_ari_get_id(device_t pcib, device_t dev,
68 enum pci_id_type type, uintptr_t *id);
69 static uint32_t pcib_read_config(device_t dev, u_int b, u_int s,
70 u_int f, u_int reg, int width);
71 static void pcib_write_config(device_t dev, u_int b, u_int s,
72 u_int f, u_int reg, uint32_t val, int width);
73 static int pcib_ari_maxslots(device_t dev);
74 static int pcib_ari_maxfuncs(device_t dev);
75 static int pcib_try_enable_ari(device_t pcib, device_t dev);
76 static int pcib_ari_enabled(device_t pcib);
77 static void pcib_ari_decode_rid(device_t pcib, uint16_t rid,
78 int *bus, int *slot, int *func);
80 static void pcib_pcie_ab_timeout(void *arg, int pending);
81 static void pcib_pcie_cc_timeout(void *arg, int pending);
82 static void pcib_pcie_dll_timeout(void *arg, int pending);
84 static int pcib_request_feature_default(device_t pcib, device_t dev,
85 enum pci_feature feature);
86 static int pcib_reset_child(device_t dev, device_t child, int flags);
88 static device_method_t pcib_methods[] = {
89 /* Device interface */
90 DEVMETHOD(device_probe, pcib_probe),
91 DEVMETHOD(device_attach, pcib_attach),
92 DEVMETHOD(device_detach, pcib_detach),
93 DEVMETHOD(device_shutdown, bus_generic_shutdown),
94 DEVMETHOD(device_suspend, pcib_suspend),
95 DEVMETHOD(device_resume, pcib_resume),
98 DEVMETHOD(bus_child_present, pcib_child_present),
99 DEVMETHOD(bus_read_ivar, pcib_read_ivar),
100 DEVMETHOD(bus_write_ivar, pcib_write_ivar),
101 DEVMETHOD(bus_alloc_resource, pcib_alloc_resource),
103 DEVMETHOD(bus_adjust_resource, pcib_adjust_resource),
104 DEVMETHOD(bus_release_resource, pcib_release_resource),
106 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
107 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
109 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
110 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
111 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
112 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
113 DEVMETHOD(bus_reset_child, pcib_reset_child),
116 DEVMETHOD(pcib_maxslots, pcib_ari_maxslots),
117 DEVMETHOD(pcib_maxfuncs, pcib_ari_maxfuncs),
118 DEVMETHOD(pcib_read_config, pcib_read_config),
119 DEVMETHOD(pcib_write_config, pcib_write_config),
120 DEVMETHOD(pcib_route_interrupt, pcib_route_interrupt),
121 DEVMETHOD(pcib_alloc_msi, pcib_alloc_msi),
122 DEVMETHOD(pcib_release_msi, pcib_release_msi),
123 DEVMETHOD(pcib_alloc_msix, pcib_alloc_msix),
124 DEVMETHOD(pcib_release_msix, pcib_release_msix),
125 DEVMETHOD(pcib_map_msi, pcib_map_msi),
126 DEVMETHOD(pcib_power_for_sleep, pcib_power_for_sleep),
127 DEVMETHOD(pcib_get_id, pcib_ari_get_id),
128 DEVMETHOD(pcib_try_enable_ari, pcib_try_enable_ari),
129 DEVMETHOD(pcib_ari_enabled, pcib_ari_enabled),
130 DEVMETHOD(pcib_decode_rid, pcib_ari_decode_rid),
131 DEVMETHOD(pcib_request_feature, pcib_request_feature_default),
136 static devclass_t pcib_devclass;
138 DEFINE_CLASS_0(pcib, pcib_driver, pcib_methods, sizeof(struct pcib_softc));
139 EARLY_DRIVER_MODULE(pcib, pci, pcib_driver, pcib_devclass, NULL, NULL,
142 #if defined(NEW_PCIB) || defined(PCI_HP)
143 SYSCTL_DECL(_hw_pci);
147 static int pci_clear_pcib;
148 SYSCTL_INT(_hw_pci, OID_AUTO, clear_pcib, CTLFLAG_RDTUN, &pci_clear_pcib, 0,
149 "Clear firmware-assigned resources for PCI-PCI bridge I/O windows.");
152 * Get the corresponding window if this resource from a child device was
153 * sub-allocated from one of our window resource managers.
155 static struct pcib_window *
156 pcib_get_resource_window(struct pcib_softc *sc, int type, struct resource *r)
160 if (rman_is_region_manager(r, &sc->io.rman))
164 /* Prefetchable resources may live in either memory rman. */
165 if (rman_get_flags(r) & RF_PREFETCHABLE &&
166 rman_is_region_manager(r, &sc->pmem.rman))
168 if (rman_is_region_manager(r, &sc->mem.rman))
176 * Is a resource from a child device sub-allocated from one of our
180 pcib_is_resource_managed(struct pcib_softc *sc, int type, struct resource *r)
184 if (type == PCI_RES_BUS)
185 return (rman_is_region_manager(r, &sc->bus.rman));
187 return (pcib_get_resource_window(sc, type, r) != NULL);
191 pcib_is_window_open(struct pcib_window *pw)
194 return (pw->valid && pw->base < pw->limit);
198 * XXX: If RF_ACTIVE did not also imply allocating a bus space tag and
199 * handle for the resource, we could pass RF_ACTIVE up to the PCI bus
200 * when allocating the resource windows and rely on the PCI bus driver
204 pcib_activate_window(struct pcib_softc *sc, int type)
207 PCI_ENABLE_IO(device_get_parent(sc->dev), sc->dev, type);
211 pcib_write_windows(struct pcib_softc *sc, int mask)
217 if (sc->io.valid && mask & WIN_IO) {
218 val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
219 if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
220 pci_write_config(dev, PCIR_IOBASEH_1,
221 sc->io.base >> 16, 2);
222 pci_write_config(dev, PCIR_IOLIMITH_1,
223 sc->io.limit >> 16, 2);
225 pci_write_config(dev, PCIR_IOBASEL_1, sc->io.base >> 8, 1);
226 pci_write_config(dev, PCIR_IOLIMITL_1, sc->io.limit >> 8, 1);
229 if (mask & WIN_MEM) {
230 pci_write_config(dev, PCIR_MEMBASE_1, sc->mem.base >> 16, 2);
231 pci_write_config(dev, PCIR_MEMLIMIT_1, sc->mem.limit >> 16, 2);
234 if (sc->pmem.valid && mask & WIN_PMEM) {
235 val = pci_read_config(dev, PCIR_PMBASEL_1, 2);
236 if ((val & PCIM_BRPM_MASK) == PCIM_BRPM_64) {
237 pci_write_config(dev, PCIR_PMBASEH_1,
238 sc->pmem.base >> 32, 4);
239 pci_write_config(dev, PCIR_PMLIMITH_1,
240 sc->pmem.limit >> 32, 4);
242 pci_write_config(dev, PCIR_PMBASEL_1, sc->pmem.base >> 16, 2);
243 pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmem.limit >> 16, 2);
248 * This is used to reject I/O port allocations that conflict with an
252 pcib_is_isa_range(struct pcib_softc *sc, rman_res_t start, rman_res_t end,
255 rman_res_t next_alias;
257 if (!(sc->bridgectl & PCIB_BCR_ISA_ENABLE))
260 /* Only check fixed ranges for overlap. */
261 if (start + count - 1 != end)
264 /* ISA aliases are only in the lower 64KB of I/O space. */
268 /* Check for overlap with 0x000 - 0x0ff as a special case. */
273 * If the start address is an alias, the range is an alias.
274 * Otherwise, compute the start of the next alias range and
275 * check if it is before the end of the candidate range.
277 if ((start & 0x300) != 0)
279 next_alias = (start & ~0x3fful) | 0x100;
280 if (next_alias <= end)
286 device_printf(sc->dev,
287 "I/O range %#jx-%#jx overlaps with an ISA alias\n", start,
293 pcib_add_window_resources(struct pcib_window *w, struct resource **res,
296 struct resource **newarray;
299 newarray = malloc(sizeof(struct resource *) * (w->count + count),
302 bcopy(w->res, newarray, sizeof(struct resource *) * w->count);
303 bcopy(res, newarray + w->count, sizeof(struct resource *) * count);
304 free(w->res, M_DEVBUF);
308 for (i = 0; i < count; i++) {
309 error = rman_manage_region(&w->rman, rman_get_start(res[i]),
310 rman_get_end(res[i]));
312 panic("Failed to add resource to rman");
316 typedef void (nonisa_callback)(rman_res_t start, rman_res_t end, void *arg);
319 pcib_walk_nonisa_ranges(rman_res_t start, rman_res_t end, nonisa_callback *cb,
325 * If start is within an ISA alias range, move up to the start
326 * of the next non-alias range. As a special case, addresses
327 * in the range 0x000 - 0x0ff should also be skipped since
328 * those are used for various system I/O devices in ISA
331 if (start <= 65535) {
332 if (start < 0x100 || (start & 0x300) != 0) {
338 /* ISA aliases are only in the lower 64KB of I/O space. */
339 while (start <= MIN(end, 65535)) {
340 next_end = MIN(start | 0xff, end);
341 cb(start, next_end, arg);
350 count_ranges(rman_res_t start, rman_res_t end, void *arg)
359 struct resource **res;
360 struct pcib_softc *sc;
365 alloc_ranges(rman_res_t start, rman_res_t end, void *arg)
367 struct alloc_state *as;
368 struct pcib_window *w;
378 device_printf(as->sc->dev,
379 "allocating non-ISA range %#jx-%#jx\n", start, end);
380 as->res[as->count] = bus_alloc_resource(as->sc->dev, SYS_RES_IOPORT,
381 &rid, start, end, end - start + 1, 0);
382 if (as->res[as->count] == NULL)
389 pcib_alloc_nonisa_ranges(struct pcib_softc *sc, rman_res_t start, rman_res_t end)
391 struct alloc_state as;
394 /* First, see how many ranges we need. */
396 pcib_walk_nonisa_ranges(start, end, count_ranges, &new_count);
398 /* Second, allocate the ranges. */
399 as.res = malloc(sizeof(struct resource *) * new_count, M_DEVBUF,
404 pcib_walk_nonisa_ranges(start, end, alloc_ranges, &as);
406 for (i = 0; i < as.count; i++)
407 bus_release_resource(sc->dev, SYS_RES_IOPORT,
408 sc->io.reg, as.res[i]);
409 free(as.res, M_DEVBUF);
412 KASSERT(as.count == new_count, ("%s: count mismatch", __func__));
414 /* Third, add the ranges to the window. */
415 pcib_add_window_resources(&sc->io, as.res, as.count);
416 free(as.res, M_DEVBUF);
421 pcib_alloc_window(struct pcib_softc *sc, struct pcib_window *w, int type,
422 int flags, pci_addr_t max_address)
424 struct resource *res;
428 if (max_address != (rman_res_t)max_address)
430 w->rman.rm_start = 0;
431 w->rman.rm_end = max_address;
432 w->rman.rm_type = RMAN_ARRAY;
433 snprintf(buf, sizeof(buf), "%s %s window",
434 device_get_nameunit(sc->dev), w->name);
435 w->rman.rm_descr = strdup(buf, M_DEVBUF);
436 error = rman_init(&w->rman);
438 panic("Failed to initialize %s %s rman",
439 device_get_nameunit(sc->dev), w->name);
441 if (!pcib_is_window_open(w))
444 if (w->base > max_address || w->limit > max_address) {
445 device_printf(sc->dev,
446 "initial %s window has too many bits, ignoring\n", w->name);
449 if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE)
450 (void)pcib_alloc_nonisa_ranges(sc, w->base, w->limit);
453 res = bus_alloc_resource(sc->dev, type, &rid, w->base, w->limit,
454 w->limit - w->base + 1, flags);
456 pcib_add_window_resources(w, &res, 1);
458 if (w->res == NULL) {
459 device_printf(sc->dev,
460 "failed to allocate initial %s window: %#jx-%#jx\n",
461 w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
462 w->base = max_address;
464 pcib_write_windows(sc, w->mask);
467 pcib_activate_window(sc, type);
471 * Initialize I/O windows.
474 pcib_probe_windows(struct pcib_softc *sc)
482 if (pci_clear_pcib) {
483 pcib_bridge_init(dev);
486 /* Determine if the I/O port window is implemented. */
487 val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
490 * If 'val' is zero, then only 16-bits of I/O space
493 pci_write_config(dev, PCIR_IOBASEL_1, 0xff, 1);
494 if (pci_read_config(dev, PCIR_IOBASEL_1, 1) != 0) {
496 pci_write_config(dev, PCIR_IOBASEL_1, 0, 1);
501 /* Read the existing I/O port window. */
503 sc->io.reg = PCIR_IOBASEL_1;
505 sc->io.mask = WIN_IO;
506 sc->io.name = "I/O port";
507 if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
508 sc->io.base = PCI_PPBIOBASE(
509 pci_read_config(dev, PCIR_IOBASEH_1, 2), val);
510 sc->io.limit = PCI_PPBIOLIMIT(
511 pci_read_config(dev, PCIR_IOLIMITH_1, 2),
512 pci_read_config(dev, PCIR_IOLIMITL_1, 1));
515 sc->io.base = PCI_PPBIOBASE(0, val);
516 sc->io.limit = PCI_PPBIOLIMIT(0,
517 pci_read_config(dev, PCIR_IOLIMITL_1, 1));
520 pcib_alloc_window(sc, &sc->io, SYS_RES_IOPORT, 0, max);
523 /* Read the existing memory window. */
525 sc->mem.reg = PCIR_MEMBASE_1;
527 sc->mem.mask = WIN_MEM;
528 sc->mem.name = "memory";
529 sc->mem.base = PCI_PPBMEMBASE(0,
530 pci_read_config(dev, PCIR_MEMBASE_1, 2));
531 sc->mem.limit = PCI_PPBMEMLIMIT(0,
532 pci_read_config(dev, PCIR_MEMLIMIT_1, 2));
533 pcib_alloc_window(sc, &sc->mem, SYS_RES_MEMORY, 0, 0xffffffff);
535 /* Determine if the prefetchable memory window is implemented. */
536 val = pci_read_config(dev, PCIR_PMBASEL_1, 2);
539 * If 'val' is zero, then only 32-bits of memory space
542 pci_write_config(dev, PCIR_PMBASEL_1, 0xffff, 2);
543 if (pci_read_config(dev, PCIR_PMBASEL_1, 2) != 0) {
545 pci_write_config(dev, PCIR_PMBASEL_1, 0, 2);
550 /* Read the existing prefetchable memory window. */
551 if (sc->pmem.valid) {
552 sc->pmem.reg = PCIR_PMBASEL_1;
554 sc->pmem.mask = WIN_PMEM;
555 sc->pmem.name = "prefetch";
556 if ((val & PCIM_BRPM_MASK) == PCIM_BRPM_64) {
557 sc->pmem.base = PCI_PPBMEMBASE(
558 pci_read_config(dev, PCIR_PMBASEH_1, 4), val);
559 sc->pmem.limit = PCI_PPBMEMLIMIT(
560 pci_read_config(dev, PCIR_PMLIMITH_1, 4),
561 pci_read_config(dev, PCIR_PMLIMITL_1, 2));
562 max = 0xffffffffffffffff;
564 sc->pmem.base = PCI_PPBMEMBASE(0, val);
565 sc->pmem.limit = PCI_PPBMEMLIMIT(0,
566 pci_read_config(dev, PCIR_PMLIMITL_1, 2));
569 pcib_alloc_window(sc, &sc->pmem, SYS_RES_MEMORY,
570 RF_PREFETCHABLE, max);
575 pcib_release_window(struct pcib_softc *sc, struct pcib_window *w, int type)
584 error = rman_fini(&w->rman);
586 device_printf(dev, "failed to release %s rman\n", w->name);
589 free(__DECONST(char *, w->rman.rm_descr), M_DEVBUF);
591 for (i = 0; i < w->count; i++) {
592 error = bus_free_resource(dev, type, w->res[i]);
595 "failed to release %s resource: %d\n", w->name,
598 free(w->res, M_DEVBUF);
602 pcib_free_windows(struct pcib_softc *sc)
605 pcib_release_window(sc, &sc->pmem, SYS_RES_MEMORY);
606 pcib_release_window(sc, &sc->mem, SYS_RES_MEMORY);
607 pcib_release_window(sc, &sc->io, SYS_RES_IOPORT);
612 * Allocate a suitable secondary bus for this bridge if needed and
613 * initialize the resource manager for the secondary bus range. Note
614 * that the minimum count is a desired value and this may allocate a
618 pcib_setup_secbus(device_t dev, struct pcib_secbus *bus, int min_count)
621 int error, rid, sec_reg;
623 switch (pci_read_config(dev, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE) {
624 case PCIM_HDRTYPE_BRIDGE:
625 sec_reg = PCIR_SECBUS_1;
626 bus->sub_reg = PCIR_SUBBUS_1;
628 case PCIM_HDRTYPE_CARDBUS:
629 sec_reg = PCIR_SECBUS_2;
630 bus->sub_reg = PCIR_SUBBUS_2;
633 panic("not a PCI bridge");
635 bus->sec = pci_read_config(dev, sec_reg, 1);
636 bus->sub = pci_read_config(dev, bus->sub_reg, 1);
638 bus->rman.rm_start = 0;
639 bus->rman.rm_end = PCI_BUSMAX;
640 bus->rman.rm_type = RMAN_ARRAY;
641 snprintf(buf, sizeof(buf), "%s bus numbers", device_get_nameunit(dev));
642 bus->rman.rm_descr = strdup(buf, M_DEVBUF);
643 error = rman_init(&bus->rman);
645 panic("Failed to initialize %s bus number rman",
646 device_get_nameunit(dev));
649 * Allocate a bus range. This will return an existing bus range
650 * if one exists, or a new bus range if one does not.
653 bus->res = bus_alloc_resource_anywhere(dev, PCI_RES_BUS, &rid,
655 if (bus->res == NULL) {
657 * Fall back to just allocating a range of a single bus
660 bus->res = bus_alloc_resource_anywhere(dev, PCI_RES_BUS, &rid,
662 } else if (rman_get_size(bus->res) < min_count)
664 * Attempt to grow the existing range to satisfy the
665 * minimum desired count.
667 (void)bus_adjust_resource(dev, PCI_RES_BUS, bus->res,
668 rman_get_start(bus->res), rman_get_start(bus->res) +
672 * Add the initial resource to the rman.
674 if (bus->res != NULL) {
675 error = rman_manage_region(&bus->rman, rman_get_start(bus->res),
676 rman_get_end(bus->res));
678 panic("Failed to add resource to rman");
679 bus->sec = rman_get_start(bus->res);
680 bus->sub = rman_get_end(bus->res);
685 pcib_free_secbus(device_t dev, struct pcib_secbus *bus)
689 error = rman_fini(&bus->rman);
691 device_printf(dev, "failed to release bus number rman\n");
694 free(__DECONST(char *, bus->rman.rm_descr), M_DEVBUF);
696 error = bus_free_resource(dev, PCI_RES_BUS, bus->res);
699 "failed to release bus numbers resource: %d\n", error);
702 static struct resource *
703 pcib_suballoc_bus(struct pcib_secbus *bus, device_t child, int *rid,
704 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
706 struct resource *res;
708 res = rman_reserve_resource(&bus->rman, start, end, count, flags,
714 device_printf(bus->dev,
715 "allocated bus range (%ju-%ju) for rid %d of %s\n",
716 rman_get_start(res), rman_get_end(res), *rid,
717 pcib_child_name(child));
718 rman_set_rid(res, *rid);
723 * Attempt to grow the secondary bus range. This is much simpler than
724 * for I/O windows as the range can only be grown by increasing
728 pcib_grow_subbus(struct pcib_secbus *bus, rman_res_t new_end)
733 old_end = rman_get_end(bus->res);
734 KASSERT(new_end > old_end, ("attempt to shrink subbus"));
735 error = bus_adjust_resource(bus->dev, PCI_RES_BUS, bus->res,
736 rman_get_start(bus->res), new_end);
740 device_printf(bus->dev, "grew bus range to %ju-%ju\n",
741 rman_get_start(bus->res), rman_get_end(bus->res));
742 error = rman_manage_region(&bus->rman, old_end + 1,
743 rman_get_end(bus->res));
745 panic("Failed to add resource to rman");
746 bus->sub = rman_get_end(bus->res);
747 pci_write_config(bus->dev, bus->sub_reg, bus->sub, 1);
752 pcib_alloc_subbus(struct pcib_secbus *bus, device_t child, int *rid,
753 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
755 struct resource *res;
756 rman_res_t start_free, end_free, new_end;
759 * First, see if the request can be satisified by the existing
762 res = pcib_suballoc_bus(bus, child, rid, start, end, count, flags);
767 * Figure out a range to grow the bus range. First, find the
768 * first bus number after the last allocated bus in the rman and
769 * enforce that as a minimum starting point for the range.
771 if (rman_last_free_region(&bus->rman, &start_free, &end_free) != 0 ||
772 end_free != bus->sub)
773 start_free = bus->sub + 1;
774 if (start_free < start)
776 new_end = start_free + count - 1;
779 * See if this new range would satisfy the request if it
785 /* Finally, attempt to grow the existing resource. */
787 device_printf(bus->dev,
788 "attempting to grow bus range for %ju buses\n", count);
789 printf("\tback candidate range: %ju-%ju\n", start_free,
792 if (pcib_grow_subbus(bus, new_end) == 0)
793 return (pcib_suballoc_bus(bus, child, rid, start, end, count,
802 * Is the prefetch window open (eg, can we allocate memory in it?)
805 pcib_is_prefetch_open(struct pcib_softc *sc)
807 return (sc->pmembase > 0 && sc->pmembase < sc->pmemlimit);
811 * Is the nonprefetch window open (eg, can we allocate memory in it?)
814 pcib_is_nonprefetch_open(struct pcib_softc *sc)
816 return (sc->membase > 0 && sc->membase < sc->memlimit);
820 * Is the io window open (eg, can we allocate ports in it?)
823 pcib_is_io_open(struct pcib_softc *sc)
825 return (sc->iobase > 0 && sc->iobase < sc->iolimit);
829 * Get current I/O decode.
832 pcib_get_io_decode(struct pcib_softc *sc)
839 iolow = pci_read_config(dev, PCIR_IOBASEL_1, 1);
840 if ((iolow & PCIM_BRIO_MASK) == PCIM_BRIO_32)
841 sc->iobase = PCI_PPBIOBASE(
842 pci_read_config(dev, PCIR_IOBASEH_1, 2), iolow);
844 sc->iobase = PCI_PPBIOBASE(0, iolow);
846 iolow = pci_read_config(dev, PCIR_IOLIMITL_1, 1);
847 if ((iolow & PCIM_BRIO_MASK) == PCIM_BRIO_32)
848 sc->iolimit = PCI_PPBIOLIMIT(
849 pci_read_config(dev, PCIR_IOLIMITH_1, 2), iolow);
851 sc->iolimit = PCI_PPBIOLIMIT(0, iolow);
855 * Get current memory decode.
858 pcib_get_mem_decode(struct pcib_softc *sc)
865 sc->membase = PCI_PPBMEMBASE(0,
866 pci_read_config(dev, PCIR_MEMBASE_1, 2));
867 sc->memlimit = PCI_PPBMEMLIMIT(0,
868 pci_read_config(dev, PCIR_MEMLIMIT_1, 2));
870 pmemlow = pci_read_config(dev, PCIR_PMBASEL_1, 2);
871 if ((pmemlow & PCIM_BRPM_MASK) == PCIM_BRPM_64)
872 sc->pmembase = PCI_PPBMEMBASE(
873 pci_read_config(dev, PCIR_PMBASEH_1, 4), pmemlow);
875 sc->pmembase = PCI_PPBMEMBASE(0, pmemlow);
877 pmemlow = pci_read_config(dev, PCIR_PMLIMITL_1, 2);
878 if ((pmemlow & PCIM_BRPM_MASK) == PCIM_BRPM_64)
879 sc->pmemlimit = PCI_PPBMEMLIMIT(
880 pci_read_config(dev, PCIR_PMLIMITH_1, 4), pmemlow);
882 sc->pmemlimit = PCI_PPBMEMLIMIT(0, pmemlow);
886 * Restore previous I/O decode.
889 pcib_set_io_decode(struct pcib_softc *sc)
896 iohi = sc->iobase >> 16;
898 pci_write_config(dev, PCIR_IOBASEH_1, iohi, 2);
899 pci_write_config(dev, PCIR_IOBASEL_1, sc->iobase >> 8, 1);
901 iohi = sc->iolimit >> 16;
903 pci_write_config(dev, PCIR_IOLIMITH_1, iohi, 2);
904 pci_write_config(dev, PCIR_IOLIMITL_1, sc->iolimit >> 8, 1);
908 * Restore previous memory decode.
911 pcib_set_mem_decode(struct pcib_softc *sc)
918 pci_write_config(dev, PCIR_MEMBASE_1, sc->membase >> 16, 2);
919 pci_write_config(dev, PCIR_MEMLIMIT_1, sc->memlimit >> 16, 2);
921 pmemhi = sc->pmembase >> 32;
923 pci_write_config(dev, PCIR_PMBASEH_1, pmemhi, 4);
924 pci_write_config(dev, PCIR_PMBASEL_1, sc->pmembase >> 16, 2);
926 pmemhi = sc->pmemlimit >> 32;
928 pci_write_config(dev, PCIR_PMLIMITH_1, pmemhi, 4);
929 pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmemlimit >> 16, 2);
935 * PCI-express HotPlug support.
937 static int pci_enable_pcie_hp = 1;
938 SYSCTL_INT(_hw_pci, OID_AUTO, enable_pcie_hp, CTLFLAG_RDTUN,
939 &pci_enable_pcie_hp, 0,
940 "Enable support for native PCI-express HotPlug.");
942 TASKQUEUE_DEFINE_THREAD(pci_hp);
945 pcib_probe_hotplug(struct pcib_softc *sc)
949 uint16_t link_sta, slot_sta;
951 if (!pci_enable_pcie_hp)
955 if (pci_find_cap(dev, PCIY_EXPRESS, NULL) != 0)
958 if (!(pcie_read_config(dev, PCIER_FLAGS, 2) & PCIEM_FLAGS_SLOT))
961 sc->pcie_slot_cap = pcie_read_config(dev, PCIER_SLOT_CAP, 4);
963 if ((sc->pcie_slot_cap & PCIEM_SLOT_CAP_HPC) == 0)
965 link_cap = pcie_read_config(dev, PCIER_LINK_CAP, 4);
966 if ((link_cap & PCIEM_LINK_CAP_DL_ACTIVE) == 0)
970 * Some devices report that they have an MRL when they actually
971 * do not. Since they always report that the MRL is open, child
972 * devices would be ignored. Try to detect these devices and
973 * ignore their claim of HotPlug support.
975 * If there is an open MRL but the Data Link Layer is active,
976 * the MRL is not real.
978 if ((sc->pcie_slot_cap & PCIEM_SLOT_CAP_MRLSP) != 0) {
979 link_sta = pcie_read_config(dev, PCIER_LINK_STA, 2);
980 slot_sta = pcie_read_config(dev, PCIER_SLOT_STA, 2);
981 if ((slot_sta & PCIEM_SLOT_STA_MRLSS) != 0 &&
982 (link_sta & PCIEM_LINK_STA_DL_ACTIVE) != 0) {
988 * Now that we're sure we want to do hot plug, ask the
989 * firmware, if any, if that's OK.
991 if (pcib_request_feature(dev, PCI_FEATURE_HP) != 0) {
993 device_printf(dev, "Unable to activate hot plug feature.\n");
997 sc->flags |= PCIB_HOTPLUG;
1001 * Send a HotPlug command to the slot control register. If this slot
1002 * uses command completion interrupts and a previous command is still
1003 * in progress, then the command is dropped. Once the previous
1004 * command completes or times out, pcib_pcie_hotplug_update() will be
1005 * invoked to post a new command based on the slot's state at that
1009 pcib_pcie_hotplug_command(struct pcib_softc *sc, uint16_t val, uint16_t mask)
1016 if (sc->flags & PCIB_HOTPLUG_CMD_PENDING)
1019 ctl = pcie_read_config(dev, PCIER_SLOT_CTL, 2);
1020 new = (ctl & ~mask) | val;
1024 device_printf(dev, "HotPlug command: %04x -> %04x\n", ctl, new);
1025 pcie_write_config(dev, PCIER_SLOT_CTL, new, 2);
1026 if (!(sc->pcie_slot_cap & PCIEM_SLOT_CAP_NCCS) &&
1027 (ctl & new) & PCIEM_SLOT_CTL_CCIE) {
1028 sc->flags |= PCIB_HOTPLUG_CMD_PENDING;
1030 taskqueue_enqueue_timeout(taskqueue_pci_hp,
1031 &sc->pcie_cc_task, hz);
1036 pcib_pcie_hotplug_command_completed(struct pcib_softc *sc)
1043 device_printf(dev, "Command Completed\n");
1044 if (!(sc->flags & PCIB_HOTPLUG_CMD_PENDING))
1046 taskqueue_cancel_timeout(taskqueue_pci_hp, &sc->pcie_cc_task, NULL);
1047 sc->flags &= ~PCIB_HOTPLUG_CMD_PENDING;
1052 * Returns true if a card is fully inserted from the user's
1053 * perspective. It may not yet be ready for access, but the driver
1054 * can now start enabling access if necessary.
1057 pcib_hotplug_inserted(struct pcib_softc *sc)
1060 /* Pretend the card isn't present if a detach is forced. */
1061 if (sc->flags & PCIB_DETACHING)
1064 /* Card must be present in the slot. */
1065 if ((sc->pcie_slot_sta & PCIEM_SLOT_STA_PDS) == 0)
1068 /* A power fault implicitly turns off power to the slot. */
1069 if (sc->pcie_slot_sta & PCIEM_SLOT_STA_PFD)
1072 /* If the MRL is disengaged, the slot is powered off. */
1073 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_MRLSP &&
1074 (sc->pcie_slot_sta & PCIEM_SLOT_STA_MRLSS) != 0)
1081 * Returns -1 if the card is fully inserted, powered, and ready for
1082 * access. Otherwise, returns 0.
1085 pcib_hotplug_present(struct pcib_softc *sc)
1088 /* Card must be inserted. */
1089 if (!pcib_hotplug_inserted(sc))
1092 /* Require the Data Link Layer to be active. */
1093 if (!(sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE))
1100 pcib_pcie_hotplug_update(struct pcib_softc *sc, uint16_t val, uint16_t mask,
1103 bool card_inserted, ei_engaged;
1105 /* Clear DETACHING if Presence Detect has cleared. */
1106 if ((sc->pcie_slot_sta & (PCIEM_SLOT_STA_PDC | PCIEM_SLOT_STA_PDS)) ==
1108 sc->flags &= ~PCIB_DETACHING;
1110 card_inserted = pcib_hotplug_inserted(sc);
1112 /* Turn the power indicator on if a card is inserted. */
1113 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_PIP) {
1114 mask |= PCIEM_SLOT_CTL_PIC;
1116 val |= PCIEM_SLOT_CTL_PI_ON;
1117 else if (sc->flags & PCIB_DETACH_PENDING)
1118 val |= PCIEM_SLOT_CTL_PI_BLINK;
1120 val |= PCIEM_SLOT_CTL_PI_OFF;
1123 /* Turn the power on via the Power Controller if a card is inserted. */
1124 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_PCP) {
1125 mask |= PCIEM_SLOT_CTL_PCC;
1127 val |= PCIEM_SLOT_CTL_PC_ON;
1129 val |= PCIEM_SLOT_CTL_PC_OFF;
1133 * If a card is inserted, enable the Electromechanical
1134 * Interlock. If a card is not inserted (or we are in the
1135 * process of detaching), disable the Electromechanical
1138 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_EIP) {
1139 mask |= PCIEM_SLOT_CTL_EIC;
1140 ei_engaged = (sc->pcie_slot_sta & PCIEM_SLOT_STA_EIS) != 0;
1141 if (card_inserted != ei_engaged)
1142 val |= PCIEM_SLOT_CTL_EIC;
1146 * Start a timer to see if the Data Link Layer times out.
1147 * Note that we only start the timer if Presence Detect or MRL Sensor
1148 * changed on this interrupt. Stop any scheduled timer if
1149 * the Data Link Layer is active.
1151 if (card_inserted &&
1152 !(sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE) &&
1154 (PCIEM_SLOT_STA_MRLSC | PCIEM_SLOT_STA_PDC)) {
1156 device_printf(sc->dev,
1157 "Data Link Layer inactive\n");
1159 taskqueue_enqueue_timeout(taskqueue_pci_hp,
1160 &sc->pcie_dll_task, hz);
1161 } else if (sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE)
1162 taskqueue_cancel_timeout(taskqueue_pci_hp, &sc->pcie_dll_task,
1165 pcib_pcie_hotplug_command(sc, val, mask);
1168 * During attach the child "pci" device is added synchronously;
1169 * otherwise, the task is scheduled to manage the child
1172 if (schedule_task &&
1173 (pcib_hotplug_present(sc) != 0) != (sc->child != NULL))
1174 taskqueue_enqueue(taskqueue_pci_hp, &sc->pcie_hp_task);
1178 pcib_pcie_intr_hotplug(void *arg)
1180 struct pcib_softc *sc;
1182 uint16_t old_slot_sta;
1187 old_slot_sta = sc->pcie_slot_sta;
1188 sc->pcie_slot_sta = pcie_read_config(dev, PCIER_SLOT_STA, 2);
1190 /* Clear the events just reported. */
1191 pcie_write_config(dev, PCIER_SLOT_STA, sc->pcie_slot_sta, 2);
1194 device_printf(dev, "HotPlug interrupt: %#x\n",
1197 if (sc->pcie_slot_sta & PCIEM_SLOT_STA_ABP) {
1198 if (sc->flags & PCIB_DETACH_PENDING) {
1200 "Attention Button Pressed: Detach Cancelled\n");
1201 sc->flags &= ~PCIB_DETACH_PENDING;
1202 taskqueue_cancel_timeout(taskqueue_pci_hp,
1203 &sc->pcie_ab_task, NULL);
1204 } else if (old_slot_sta & PCIEM_SLOT_STA_PDS) {
1205 /* Only initiate detach sequence if device present. */
1207 "Attention Button Pressed: Detaching in 5 seconds\n");
1208 sc->flags |= PCIB_DETACH_PENDING;
1209 taskqueue_enqueue_timeout(taskqueue_pci_hp,
1210 &sc->pcie_ab_task, 5 * hz);
1213 if (sc->pcie_slot_sta & PCIEM_SLOT_STA_PFD)
1214 device_printf(dev, "Power Fault Detected\n");
1215 if (sc->pcie_slot_sta & PCIEM_SLOT_STA_MRLSC)
1216 device_printf(dev, "MRL Sensor Changed to %s\n",
1217 sc->pcie_slot_sta & PCIEM_SLOT_STA_MRLSS ? "open" :
1219 if (bootverbose && sc->pcie_slot_sta & PCIEM_SLOT_STA_PDC)
1220 device_printf(dev, "Presence Detect Changed to %s\n",
1221 sc->pcie_slot_sta & PCIEM_SLOT_STA_PDS ? "card present" :
1223 if (sc->pcie_slot_sta & PCIEM_SLOT_STA_CC)
1224 pcib_pcie_hotplug_command_completed(sc);
1225 if (sc->pcie_slot_sta & PCIEM_SLOT_STA_DLLSC) {
1226 sc->pcie_link_sta = pcie_read_config(dev, PCIER_LINK_STA, 2);
1229 "Data Link Layer State Changed to %s\n",
1230 sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE ?
1231 "active" : "inactive");
1234 pcib_pcie_hotplug_update(sc, 0, 0, true);
1239 pcib_pcie_hotplug_task(void *context, int pending)
1241 struct pcib_softc *sc;
1247 if (pcib_hotplug_present(sc) != 0) {
1248 if (sc->child == NULL) {
1249 sc->child = device_add_child(dev, "pci", -1);
1250 bus_generic_attach(dev);
1253 if (sc->child != NULL) {
1254 if (device_delete_child(dev, sc->child) == 0)
1262 pcib_pcie_ab_timeout(void *arg, int pending)
1264 struct pcib_softc *sc = arg;
1267 if (sc->flags & PCIB_DETACH_PENDING) {
1268 sc->flags |= PCIB_DETACHING;
1269 sc->flags &= ~PCIB_DETACH_PENDING;
1270 pcib_pcie_hotplug_update(sc, 0, 0, true);
1276 pcib_pcie_cc_timeout(void *arg, int pending)
1278 struct pcib_softc *sc = arg;
1279 device_t dev = sc->dev;
1283 sta = pcie_read_config(dev, PCIER_SLOT_STA, 2);
1284 if (!(sta & PCIEM_SLOT_STA_CC)) {
1285 device_printf(dev, "HotPlug Command Timed Out\n");
1286 sc->flags &= ~PCIB_HOTPLUG_CMD_PENDING;
1289 "Missed HotPlug interrupt waiting for Command Completion\n");
1290 pcib_pcie_intr_hotplug(sc);
1296 pcib_pcie_dll_timeout(void *arg, int pending)
1298 struct pcib_softc *sc = arg;
1299 device_t dev = sc->dev;
1303 sta = pcie_read_config(dev, PCIER_LINK_STA, 2);
1304 if (!(sta & PCIEM_LINK_STA_DL_ACTIVE)) {
1306 "Timed out waiting for Data Link Layer Active\n");
1307 sc->flags |= PCIB_DETACHING;
1308 pcib_pcie_hotplug_update(sc, 0, 0, true);
1309 } else if (sta != sc->pcie_link_sta) {
1311 "Missed HotPlug interrupt waiting for DLL Active\n");
1312 pcib_pcie_intr_hotplug(sc);
1318 pcib_alloc_pcie_irq(struct pcib_softc *sc)
1321 int count, error, rid;
1327 * For simplicity, only use MSI-X if there is a single message.
1328 * To support a device with multiple messages we would have to
1329 * use remap intr if the MSI number is not 0.
1331 count = pci_msix_count(dev);
1333 error = pci_alloc_msix(dev, &count);
1338 if (rid < 0 && pci_msi_count(dev) > 0) {
1340 error = pci_alloc_msi(dev, &count);
1348 sc->pcie_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
1349 RF_ACTIVE | RF_SHAREABLE);
1350 if (sc->pcie_irq == NULL) {
1352 "Failed to allocate interrupt for PCI-e events\n");
1354 pci_release_msi(dev);
1358 error = bus_setup_intr(dev, sc->pcie_irq, INTR_TYPE_MISC|INTR_MPSAFE,
1359 NULL, pcib_pcie_intr_hotplug, sc, &sc->pcie_ihand);
1361 device_printf(dev, "Failed to setup PCI-e interrupt handler\n");
1362 bus_release_resource(dev, SYS_RES_IRQ, rid, sc->pcie_irq);
1364 pci_release_msi(dev);
1371 pcib_release_pcie_irq(struct pcib_softc *sc)
1377 error = bus_teardown_intr(dev, sc->pcie_irq, sc->pcie_ihand);
1380 error = bus_free_resource(dev, SYS_RES_IRQ, sc->pcie_irq);
1383 return (pci_release_msi(dev));
1387 pcib_setup_hotplug(struct pcib_softc *sc)
1393 TASK_INIT(&sc->pcie_hp_task, 0, pcib_pcie_hotplug_task, sc);
1394 TIMEOUT_TASK_INIT(taskqueue_pci_hp, &sc->pcie_ab_task, 0,
1395 pcib_pcie_ab_timeout, sc);
1396 TIMEOUT_TASK_INIT(taskqueue_pci_hp, &sc->pcie_cc_task, 0,
1397 pcib_pcie_cc_timeout, sc);
1398 TIMEOUT_TASK_INIT(taskqueue_pci_hp, &sc->pcie_dll_task, 0,
1399 pcib_pcie_dll_timeout, sc);
1400 sc->pcie_hp_lock = &Giant;
1403 if (pcib_alloc_pcie_irq(sc) != 0)
1406 sc->pcie_link_sta = pcie_read_config(dev, PCIER_LINK_STA, 2);
1407 sc->pcie_slot_sta = pcie_read_config(dev, PCIER_SLOT_STA, 2);
1409 /* Clear any events previously pending. */
1410 pcie_write_config(dev, PCIER_SLOT_STA, sc->pcie_slot_sta, 2);
1412 /* Enable HotPlug events. */
1413 mask = PCIEM_SLOT_CTL_DLLSCE | PCIEM_SLOT_CTL_HPIE |
1414 PCIEM_SLOT_CTL_CCIE | PCIEM_SLOT_CTL_PDCE | PCIEM_SLOT_CTL_MRLSCE |
1415 PCIEM_SLOT_CTL_PFDE | PCIEM_SLOT_CTL_ABPE;
1416 val = PCIEM_SLOT_CTL_DLLSCE | PCIEM_SLOT_CTL_HPIE | PCIEM_SLOT_CTL_PDCE;
1417 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_APB)
1418 val |= PCIEM_SLOT_CTL_ABPE;
1419 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_PCP)
1420 val |= PCIEM_SLOT_CTL_PFDE;
1421 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_MRLSP)
1422 val |= PCIEM_SLOT_CTL_MRLSCE;
1423 if (!(sc->pcie_slot_cap & PCIEM_SLOT_CAP_NCCS))
1424 val |= PCIEM_SLOT_CTL_CCIE;
1426 /* Turn the attention indicator off. */
1427 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_AIP) {
1428 mask |= PCIEM_SLOT_CTL_AIC;
1429 val |= PCIEM_SLOT_CTL_AI_OFF;
1432 pcib_pcie_hotplug_update(sc, val, mask, false);
1436 pcib_detach_hotplug(struct pcib_softc *sc)
1441 /* Disable the card in the slot and force it to detach. */
1442 if (sc->flags & PCIB_DETACH_PENDING) {
1443 sc->flags &= ~PCIB_DETACH_PENDING;
1444 taskqueue_cancel_timeout(taskqueue_pci_hp, &sc->pcie_ab_task,
1447 sc->flags |= PCIB_DETACHING;
1449 if (sc->flags & PCIB_HOTPLUG_CMD_PENDING) {
1450 taskqueue_cancel_timeout(taskqueue_pci_hp, &sc->pcie_cc_task,
1452 tsleep(sc, 0, "hpcmd", hz);
1453 sc->flags &= ~PCIB_HOTPLUG_CMD_PENDING;
1456 /* Disable HotPlug events. */
1457 mask = PCIEM_SLOT_CTL_DLLSCE | PCIEM_SLOT_CTL_HPIE |
1458 PCIEM_SLOT_CTL_CCIE | PCIEM_SLOT_CTL_PDCE | PCIEM_SLOT_CTL_MRLSCE |
1459 PCIEM_SLOT_CTL_PFDE | PCIEM_SLOT_CTL_ABPE;
1462 /* Turn the attention indicator off. */
1463 if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_AIP) {
1464 mask |= PCIEM_SLOT_CTL_AIC;
1465 val |= PCIEM_SLOT_CTL_AI_OFF;
1468 pcib_pcie_hotplug_update(sc, val, mask, false);
1470 error = pcib_release_pcie_irq(sc);
1473 taskqueue_drain(taskqueue_pci_hp, &sc->pcie_hp_task);
1474 taskqueue_drain_timeout(taskqueue_pci_hp, &sc->pcie_ab_task);
1475 taskqueue_drain_timeout(taskqueue_pci_hp, &sc->pcie_cc_task);
1476 taskqueue_drain_timeout(taskqueue_pci_hp, &sc->pcie_dll_task);
1482 * Get current bridge configuration.
1485 pcib_cfg_save(struct pcib_softc *sc)
1493 command = pci_read_config(dev, PCIR_COMMAND, 2);
1494 if (command & PCIM_CMD_PORTEN)
1495 pcib_get_io_decode(sc);
1496 if (command & PCIM_CMD_MEMEN)
1497 pcib_get_mem_decode(sc);
1502 * Restore previous bridge configuration.
1505 pcib_cfg_restore(struct pcib_softc *sc)
1512 pcib_write_windows(sc, WIN_IO | WIN_MEM | WIN_PMEM);
1514 command = pci_read_config(sc->dev, PCIR_COMMAND, 2);
1515 if (command & PCIM_CMD_PORTEN)
1516 pcib_set_io_decode(sc);
1517 if (command & PCIM_CMD_MEMEN)
1518 pcib_set_mem_decode(sc);
1523 * Generic device interface
1526 pcib_probe(device_t dev)
1528 if ((pci_get_class(dev) == PCIC_BRIDGE) &&
1529 (pci_get_subclass(dev) == PCIS_BRIDGE_PCI)) {
1530 device_set_desc(dev, "PCI-PCI bridge");
1537 pcib_attach_common(device_t dev)
1539 struct pcib_softc *sc;
1540 struct sysctl_ctx_list *sctx;
1541 struct sysctl_oid *soid;
1544 sc = device_get_softc(dev);
1548 * Get current bridge configuration.
1550 sc->domain = pci_get_domain(dev);
1551 #if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
1552 sc->bus.sec = pci_read_config(dev, PCIR_SECBUS_1, 1);
1553 sc->bus.sub = pci_read_config(dev, PCIR_SUBBUS_1, 1);
1555 sc->bridgectl = pci_read_config(dev, PCIR_BRIDGECTL_1, 2);
1559 * The primary bus register should always be the bus of the
1562 sc->pribus = pci_get_bus(dev);
1563 pci_write_config(dev, PCIR_PRIBUS_1, sc->pribus, 1);
1566 * Setup sysctl reporting nodes
1568 sctx = device_get_sysctl_ctx(dev);
1569 soid = device_get_sysctl_tree(dev);
1570 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "domain",
1571 CTLFLAG_RD, &sc->domain, 0, "Domain number");
1572 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "pribus",
1573 CTLFLAG_RD, &sc->pribus, 0, "Primary bus number");
1574 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "secbus",
1575 CTLFLAG_RD, &sc->bus.sec, 0, "Secondary bus number");
1576 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "subbus",
1577 CTLFLAG_RD, &sc->bus.sub, 0, "Subordinate bus number");
1582 switch (pci_get_devid(dev)) {
1583 #if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
1584 case 0x12258086: /* Intel 82454KX/GX (Orion) */
1588 supbus = pci_read_config(dev, 0x41, 1);
1589 if (supbus != 0xff) {
1590 sc->bus.sec = supbus + 1;
1591 sc->bus.sub = supbus + 1;
1598 * The i82380FB mobile docking controller is a PCI-PCI bridge,
1599 * and it is a subtractive bridge. However, the ProgIf is wrong
1600 * so the normal setting of PCIB_SUBTRACTIVE bit doesn't
1601 * happen. There are also Toshiba and Cavium ThunderX bridges
1602 * that behave this way.
1604 case 0xa002177d: /* Cavium ThunderX */
1605 case 0x124b8086: /* Intel 82380FB Mobile */
1606 case 0x060513d7: /* Toshiba ???? */
1607 sc->flags |= PCIB_SUBTRACTIVE;
1610 #if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
1611 /* Compaq R3000 BIOS sets wrong subordinate bus number. */
1616 if ((cp = kern_getenv("smbios.planar.maker")) == NULL)
1618 if (strncmp(cp, "Compal", 6) != 0) {
1623 if ((cp = kern_getenv("smbios.planar.product")) == NULL)
1625 if (strncmp(cp, "08A0", 4) != 0) {
1630 if (sc->bus.sub < 0xa) {
1631 pci_write_config(dev, PCIR_SUBBUS_1, 0xa, 1);
1632 sc->bus.sub = pci_read_config(dev, PCIR_SUBBUS_1, 1);
1639 if (pci_msi_device_blacklisted(dev))
1640 sc->flags |= PCIB_DISABLE_MSI;
1642 if (pci_msix_device_blacklisted(dev))
1643 sc->flags |= PCIB_DISABLE_MSIX;
1646 * Intel 815, 845 and other chipsets say they are PCI-PCI bridges,
1647 * but have a ProgIF of 0x80. The 82801 family (AA, AB, BAM/CAM,
1648 * BA/CA/DB and E) PCI bridges are HUB-PCI bridges, in Intelese.
1649 * This means they act as if they were subtractively decoding
1650 * bridges and pass all transactions. Mark them and real ProgIf 1
1651 * parts as subtractive.
1653 if ((pci_get_devid(dev) & 0xff00ffff) == 0x24008086 ||
1654 pci_read_config(dev, PCIR_PROGIF, 1) == PCIP_BRIDGE_PCI_SUBTRACTIVE)
1655 sc->flags |= PCIB_SUBTRACTIVE;
1658 pcib_probe_hotplug(sc);
1662 pcib_setup_secbus(dev, &sc->bus, 1);
1664 pcib_probe_windows(sc);
1667 if (sc->flags & PCIB_HOTPLUG)
1668 pcib_setup_hotplug(sc);
1671 device_printf(dev, " domain %d\n", sc->domain);
1672 device_printf(dev, " secondary bus %d\n", sc->bus.sec);
1673 device_printf(dev, " subordinate bus %d\n", sc->bus.sub);
1675 if (pcib_is_window_open(&sc->io))
1676 device_printf(dev, " I/O decode 0x%jx-0x%jx\n",
1677 (uintmax_t)sc->io.base, (uintmax_t)sc->io.limit);
1678 if (pcib_is_window_open(&sc->mem))
1679 device_printf(dev, " memory decode 0x%jx-0x%jx\n",
1680 (uintmax_t)sc->mem.base, (uintmax_t)sc->mem.limit);
1681 if (pcib_is_window_open(&sc->pmem))
1682 device_printf(dev, " prefetched decode 0x%jx-0x%jx\n",
1683 (uintmax_t)sc->pmem.base, (uintmax_t)sc->pmem.limit);
1685 if (pcib_is_io_open(sc))
1686 device_printf(dev, " I/O decode 0x%x-0x%x\n",
1687 sc->iobase, sc->iolimit);
1688 if (pcib_is_nonprefetch_open(sc))
1689 device_printf(dev, " memory decode 0x%jx-0x%jx\n",
1690 (uintmax_t)sc->membase, (uintmax_t)sc->memlimit);
1691 if (pcib_is_prefetch_open(sc))
1692 device_printf(dev, " prefetched decode 0x%jx-0x%jx\n",
1693 (uintmax_t)sc->pmembase, (uintmax_t)sc->pmemlimit);
1695 if (sc->bridgectl & (PCIB_BCR_ISA_ENABLE | PCIB_BCR_VGA_ENABLE) ||
1696 sc->flags & PCIB_SUBTRACTIVE) {
1697 device_printf(dev, " special decode ");
1699 if (sc->bridgectl & PCIB_BCR_ISA_ENABLE) {
1703 if (sc->bridgectl & PCIB_BCR_VGA_ENABLE) {
1704 printf("%sVGA", comma ? ", " : "");
1707 if (sc->flags & PCIB_SUBTRACTIVE)
1708 printf("%ssubtractive", comma ? ", " : "");
1714 * Always enable busmastering on bridges so that transactions
1715 * initiated on the secondary bus are passed through to the
1718 pci_enable_busmaster(dev);
1723 pcib_present(struct pcib_softc *sc)
1726 if (sc->flags & PCIB_HOTPLUG)
1727 return (pcib_hotplug_present(sc) != 0);
1733 pcib_attach_child(device_t dev)
1735 struct pcib_softc *sc;
1737 sc = device_get_softc(dev);
1738 if (sc->bus.sec == 0) {
1739 /* no secondary bus; we should have fixed this */
1744 if (!pcib_present(sc)) {
1745 /* An empty HotPlug slot, so don't add a PCI bus yet. */
1750 sc->child = device_add_child(dev, "pci", -1);
1751 return (bus_generic_attach(dev));
1755 pcib_attach(device_t dev)
1758 pcib_attach_common(dev);
1759 return (pcib_attach_child(dev));
1763 pcib_detach(device_t dev)
1765 #if defined(PCI_HP) || defined(NEW_PCIB)
1766 struct pcib_softc *sc;
1770 #if defined(PCI_HP) || defined(NEW_PCIB)
1771 sc = device_get_softc(dev);
1773 error = bus_generic_detach(dev);
1777 if (sc->flags & PCIB_HOTPLUG) {
1778 error = pcib_detach_hotplug(sc);
1783 error = device_delete_children(dev);
1787 pcib_free_windows(sc);
1789 pcib_free_secbus(dev, &sc->bus);
1796 pcib_suspend(device_t dev)
1799 pcib_cfg_save(device_get_softc(dev));
1800 return (bus_generic_suspend(dev));
1804 pcib_resume(device_t dev)
1807 pcib_cfg_restore(device_get_softc(dev));
1810 * Restore the Command register only after restoring the windows.
1811 * The bridge should not be claiming random windows.
1813 pci_write_config(dev, PCIR_COMMAND, pci_get_cmdreg(dev), 2);
1814 return (bus_generic_resume(dev));
1818 pcib_bridge_init(device_t dev)
1820 pci_write_config(dev, PCIR_IOBASEL_1, 0xff, 1);
1821 pci_write_config(dev, PCIR_IOBASEH_1, 0xffff, 2);
1822 pci_write_config(dev, PCIR_IOLIMITL_1, 0, 1);
1823 pci_write_config(dev, PCIR_IOLIMITH_1, 0, 2);
1824 pci_write_config(dev, PCIR_MEMBASE_1, 0xffff, 2);
1825 pci_write_config(dev, PCIR_MEMLIMIT_1, 0, 2);
1826 pci_write_config(dev, PCIR_PMBASEL_1, 0xffff, 2);
1827 pci_write_config(dev, PCIR_PMBASEH_1, 0xffffffff, 4);
1828 pci_write_config(dev, PCIR_PMLIMITL_1, 0, 2);
1829 pci_write_config(dev, PCIR_PMLIMITH_1, 0, 4);
1833 pcib_child_present(device_t dev, device_t child)
1836 struct pcib_softc *sc = device_get_softc(dev);
1839 retval = bus_child_present(dev);
1840 if (retval != 0 && sc->flags & PCIB_HOTPLUG)
1841 retval = pcib_hotplug_present(sc);
1844 return (bus_child_present(dev));
1849 pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
1851 struct pcib_softc *sc = device_get_softc(dev);
1854 case PCIB_IVAR_DOMAIN:
1855 *result = sc->domain;
1858 *result = sc->bus.sec;
1865 pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
1869 case PCIB_IVAR_DOMAIN:
1879 * Attempt to allocate a resource from the existing resources assigned
1882 static struct resource *
1883 pcib_suballoc_resource(struct pcib_softc *sc, struct pcib_window *w,
1884 device_t child, int type, int *rid, rman_res_t start, rman_res_t end,
1885 rman_res_t count, u_int flags)
1887 struct resource *res;
1889 if (!pcib_is_window_open(w))
1892 res = rman_reserve_resource(&w->rman, start, end, count,
1893 flags & ~RF_ACTIVE, child);
1898 device_printf(sc->dev,
1899 "allocated %s range (%#jx-%#jx) for rid %x of %s\n",
1900 w->name, rman_get_start(res), rman_get_end(res), *rid,
1901 pcib_child_name(child));
1902 rman_set_rid(res, *rid);
1905 * If the resource should be active, pass that request up the
1906 * tree. This assumes the parent drivers can handle
1907 * activating sub-allocated resources.
1909 if (flags & RF_ACTIVE) {
1910 if (bus_activate_resource(child, type, *rid, res) != 0) {
1911 rman_release_resource(res);
1919 /* Allocate a fresh resource range for an unconfigured window. */
1921 pcib_alloc_new_window(struct pcib_softc *sc, struct pcib_window *w, int type,
1922 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
1924 struct resource *res;
1925 rman_res_t base, limit, wmask;
1929 * If this is an I/O window on a bridge with ISA enable set
1930 * and the start address is below 64k, then try to allocate an
1931 * initial window of 0x1000 bytes long starting at address
1932 * 0xf000 and walking down. Note that if the original request
1933 * was larger than the non-aliased range size of 0x100 our
1934 * caller would have raised the start address up to 64k
1937 if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
1939 for (base = 0xf000; (long)base >= 0; base -= 0x1000) {
1940 limit = base + 0xfff;
1943 * Skip ranges that wouldn't work for the
1944 * original request. Note that the actual
1945 * window that overlaps are the non-alias
1946 * ranges within [base, limit], so this isn't
1947 * quite a simple comparison.
1949 if (start + count > limit - 0x400)
1953 * The first open region for the window at
1956 if (end - count + 1 < 0x400)
1959 if (end - count + 1 < base)
1963 if (pcib_alloc_nonisa_ranges(sc, base, limit) == 0) {
1972 wmask = ((rman_res_t)1 << w->step) - 1;
1973 if (RF_ALIGNMENT(flags) < w->step) {
1974 flags &= ~RF_ALIGNMENT_MASK;
1975 flags |= RF_ALIGNMENT_LOG2(w->step);
1979 count = roundup2(count, (rman_res_t)1 << w->step);
1981 res = bus_alloc_resource(sc->dev, type, &rid, start, end, count,
1982 flags & ~RF_ACTIVE);
1985 pcib_add_window_resources(w, &res, 1);
1986 pcib_activate_window(sc, type);
1987 w->base = rman_get_start(res);
1988 w->limit = rman_get_end(res);
1992 /* Try to expand an existing window to the requested base and limit. */
1994 pcib_expand_window(struct pcib_softc *sc, struct pcib_window *w, int type,
1995 rman_res_t base, rman_res_t limit)
1997 struct resource *res;
1998 int error, i, force_64k_base;
2000 KASSERT(base <= w->base && limit >= w->limit,
2001 ("attempting to shrink window"));
2004 * XXX: pcib_grow_window() doesn't try to do this anyway and
2005 * the error handling for all the edge cases would be tedious.
2007 KASSERT(limit == w->limit || base == w->base,
2008 ("attempting to grow both ends of a window"));
2011 * Yet more special handling for requests to expand an I/O
2012 * window behind an ISA-enabled bridge. Since I/O windows
2013 * have to grow in 0x1000 increments and the end of the 0xffff
2014 * range is an alias, growing a window below 64k will always
2015 * result in allocating new resources and never adjusting an
2016 * existing resource.
2018 if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
2019 (limit <= 65535 || (base <= 65535 && base != w->base))) {
2020 KASSERT(limit == w->limit || limit <= 65535,
2021 ("attempting to grow both ends across 64k ISA alias"));
2023 if (base != w->base)
2024 error = pcib_alloc_nonisa_ranges(sc, base, w->base - 1);
2026 error = pcib_alloc_nonisa_ranges(sc, w->limit + 1,
2036 * Find the existing resource to adjust. Usually there is only one,
2037 * but for an ISA-enabled bridge we might be growing the I/O window
2038 * above 64k and need to find the existing resource that maps all
2039 * of the area above 64k.
2041 for (i = 0; i < w->count; i++) {
2042 if (rman_get_end(w->res[i]) == w->limit)
2045 KASSERT(i != w->count, ("did not find existing resource"));
2049 * Usually the resource we found should match the window's
2050 * existing range. The one exception is the ISA-enabled case
2051 * mentioned above in which case the resource should start at
2054 if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
2056 KASSERT(rman_get_start(res) == 65536,
2057 ("existing resource mismatch"));
2060 KASSERT(w->base == rman_get_start(res),
2061 ("existing resource mismatch"));
2065 error = bus_adjust_resource(sc->dev, type, res, force_64k_base ?
2066 rman_get_start(res) : base, limit);
2070 /* Add the newly allocated region to the resource manager. */
2071 if (w->base != base) {
2072 error = rman_manage_region(&w->rman, base, w->base - 1);
2075 error = rman_manage_region(&w->rman, w->limit + 1, limit);
2080 device_printf(sc->dev,
2081 "failed to expand %s resource manager\n", w->name);
2082 (void)bus_adjust_resource(sc->dev, type, res, force_64k_base ?
2083 rman_get_start(res) : w->base, w->limit);
2089 * Attempt to grow a window to make room for a given resource request.
2092 pcib_grow_window(struct pcib_softc *sc, struct pcib_window *w, int type,
2093 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
2095 rman_res_t align, start_free, end_free, front, back, wmask;
2099 * Clamp the desired resource range to the maximum address
2100 * this window supports. Reject impossible requests.
2102 * For I/O port requests behind a bridge with the ISA enable
2103 * bit set, force large allocations to start above 64k.
2107 if (sc->bridgectl & PCIB_BCR_ISA_ENABLE && count > 0x100 &&
2110 if (end > w->rman.rm_end)
2111 end = w->rman.rm_end;
2112 if (start + count - 1 > end || start + count < start)
2114 wmask = ((rman_res_t)1 << w->step) - 1;
2117 * If there is no resource at all, just try to allocate enough
2118 * aligned space for this resource.
2120 if (w->res == NULL) {
2121 error = pcib_alloc_new_window(sc, w, type, start, end, count,
2125 device_printf(sc->dev,
2126 "failed to allocate initial %s window (%#jx-%#jx,%#jx)\n",
2127 w->name, start, end, count);
2131 device_printf(sc->dev,
2132 "allocated initial %s window of %#jx-%#jx\n",
2133 w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
2138 * See if growing the window would help. Compute the minimum
2139 * amount of address space needed on both the front and back
2140 * ends of the existing window to satisfy the allocation.
2142 * For each end, build a candidate region adjusting for the
2143 * required alignment, etc. If there is a free region at the
2144 * edge of the window, grow from the inner edge of the free
2145 * region. Otherwise grow from the window boundary.
2147 * Growing an I/O window below 64k for a bridge with the ISA
2148 * enable bit doesn't require any special magic as the step
2149 * size of an I/O window (1k) always includes multiple
2150 * non-alias ranges when it is grown in either direction.
2152 * XXX: Special case: if w->res is completely empty and the
2153 * request size is larger than w->res, we should find the
2154 * optimal aligned buffer containing w->res and allocate that.
2157 device_printf(sc->dev,
2158 "attempting to grow %s window for (%#jx-%#jx,%#jx)\n",
2159 w->name, start, end, count);
2160 align = (rman_res_t)1 << RF_ALIGNMENT(flags);
2161 if (start < w->base) {
2162 if (rman_first_free_region(&w->rman, &start_free, &end_free) !=
2163 0 || start_free != w->base)
2168 /* Move end_free down until it is properly aligned. */
2169 end_free &= ~(align - 1);
2171 front = end_free - (count - 1);
2174 * The resource would now be allocated at (front,
2175 * end_free). Ensure that fits in the (start, end)
2176 * bounds. end_free is checked above. If 'front' is
2177 * ok, ensure it is properly aligned for this window.
2178 * Also check for underflow.
2180 if (front >= start && front <= end_free) {
2182 printf("\tfront candidate range: %#jx-%#jx\n",
2185 front = w->base - front;
2190 if (end > w->limit) {
2191 if (rman_last_free_region(&w->rman, &start_free, &end_free) !=
2192 0 || end_free != w->limit)
2193 start_free = w->limit + 1;
2194 if (start_free < start)
2197 /* Move start_free up until it is properly aligned. */
2198 start_free = roundup2(start_free, align);
2199 back = start_free + count - 1;
2202 * The resource would now be allocated at (start_free,
2203 * back). Ensure that fits in the (start, end)
2204 * bounds. start_free is checked above. If 'back' is
2205 * ok, ensure it is properly aligned for this window.
2206 * Also check for overflow.
2208 if (back <= end && start_free <= back) {
2210 printf("\tback candidate range: %#jx-%#jx\n",
2220 * Try to allocate the smallest needed region first.
2221 * If that fails, fall back to the other region.
2224 while (front != 0 || back != 0) {
2225 if (front != 0 && (front <= back || back == 0)) {
2226 error = pcib_expand_window(sc, w, type, w->base - front,
2232 error = pcib_expand_window(sc, w, type, w->base,
2243 device_printf(sc->dev, "grew %s window to %#jx-%#jx\n",
2244 w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
2247 /* Write the new window. */
2248 KASSERT((w->base & wmask) == 0, ("start address is not aligned"));
2249 KASSERT((w->limit & wmask) == wmask, ("end address is not aligned"));
2250 pcib_write_windows(sc, w->mask);
2255 * We have to trap resource allocation requests and ensure that the bridge
2256 * is set up to, or capable of handling them.
2259 pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
2260 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
2262 struct pcib_softc *sc;
2265 sc = device_get_softc(dev);
2268 * VGA resources are decoded iff the VGA enable bit is set in
2269 * the bridge control register. VGA resources do not fall into
2270 * the resource windows and are passed up to the parent.
2272 if ((type == SYS_RES_IOPORT && pci_is_vga_ioport_range(start, end)) ||
2273 (type == SYS_RES_MEMORY && pci_is_vga_memory_range(start, end))) {
2274 if (sc->bridgectl & PCIB_BCR_VGA_ENABLE)
2275 return (bus_generic_alloc_resource(dev, child, type,
2276 rid, start, end, count, flags));
2284 return (pcib_alloc_subbus(&sc->bus, child, rid, start, end,
2287 case SYS_RES_IOPORT:
2288 if (pcib_is_isa_range(sc, start, end, count))
2290 r = pcib_suballoc_resource(sc, &sc->io, child, type, rid, start,
2292 if (r != NULL || (sc->flags & PCIB_SUBTRACTIVE) != 0)
2294 if (pcib_grow_window(sc, &sc->io, type, start, end, count,
2296 r = pcib_suballoc_resource(sc, &sc->io, child, type,
2297 rid, start, end, count, flags);
2299 case SYS_RES_MEMORY:
2301 * For prefetchable resources, prefer the prefetchable
2302 * memory window, but fall back to the regular memory
2303 * window if that fails. Try both windows before
2304 * attempting to grow a window in case the firmware
2305 * has used a range in the regular memory window to
2306 * map a prefetchable BAR.
2308 if (flags & RF_PREFETCHABLE) {
2309 r = pcib_suballoc_resource(sc, &sc->pmem, child, type,
2310 rid, start, end, count, flags);
2314 r = pcib_suballoc_resource(sc, &sc->mem, child, type, rid,
2315 start, end, count, flags);
2316 if (r != NULL || (sc->flags & PCIB_SUBTRACTIVE) != 0)
2318 if (flags & RF_PREFETCHABLE) {
2319 if (pcib_grow_window(sc, &sc->pmem, type, start, end,
2320 count, flags) == 0) {
2321 r = pcib_suballoc_resource(sc, &sc->pmem, child,
2322 type, rid, start, end, count, flags);
2327 if (pcib_grow_window(sc, &sc->mem, type, start, end, count,
2328 flags & ~RF_PREFETCHABLE) == 0)
2329 r = pcib_suballoc_resource(sc, &sc->mem, child, type,
2330 rid, start, end, count, flags);
2333 return (bus_generic_alloc_resource(dev, child, type, rid,
2334 start, end, count, flags));
2338 * If attempts to suballocate from the window fail but this is a
2339 * subtractive bridge, pass the request up the tree.
2341 if (sc->flags & PCIB_SUBTRACTIVE && r == NULL)
2342 return (bus_generic_alloc_resource(dev, child, type, rid,
2343 start, end, count, flags));
2348 pcib_adjust_resource(device_t bus, device_t child, int type, struct resource *r,
2349 rman_res_t start, rman_res_t end)
2351 struct pcib_softc *sc;
2352 struct pcib_window *w;
2356 sc = device_get_softc(bus);
2359 * If the resource wasn't sub-allocated from one of our region
2360 * managers then just pass the request up.
2362 if (!pcib_is_resource_managed(sc, type, r))
2363 return (bus_generic_adjust_resource(bus, child, type, r,
2367 if (type == PCI_RES_BUS) {
2369 * If our bus range isn't big enough to grow the sub-allocation
2370 * then we need to grow our bus range. Any request that would
2371 * require us to decrease the start of our own bus range is
2372 * invalid, we can only extend the end; ignore such requests
2373 * and let rman_adjust_resource fail below.
2375 if (start >= sc->bus.sec && end > sc->bus.sub) {
2376 error = pcib_grow_subbus(&sc->bus, end);
2384 * Resource is managed and not a secondary bus number, must
2385 * be from one of our windows.
2387 w = pcib_get_resource_window(sc, type, r);
2389 ("%s: no window for resource (%#jx-%#jx) type %d",
2390 __func__, rman_get_start(r), rman_get_end(r), type));
2393 * If our window isn't big enough to grow the sub-allocation
2394 * then we need to expand the window.
2396 if (start < w->base || end > w->limit) {
2397 wmask = ((rman_res_t)1 << w->step) - 1;
2398 error = pcib_expand_window(sc, w, type,
2399 MIN(start & ~wmask, w->base),
2400 MAX(end | wmask, w->limit));
2404 device_printf(sc->dev,
2405 "grew %s window to %#jx-%#jx\n",
2406 w->name, (uintmax_t)w->base,
2407 (uintmax_t)w->limit);
2408 pcib_write_windows(sc, w->mask);
2412 return (rman_adjust_resource(r, start, end));
2416 pcib_release_resource(device_t dev, device_t child, int type, int rid,
2419 struct pcib_softc *sc;
2422 sc = device_get_softc(dev);
2423 if (pcib_is_resource_managed(sc, type, r)) {
2424 if (rman_get_flags(r) & RF_ACTIVE) {
2425 error = bus_deactivate_resource(child, type, rid, r);
2429 return (rman_release_resource(r));
2431 return (bus_generic_release_resource(dev, child, type, rid, r));
2435 * We have to trap resource allocation requests and ensure that the bridge
2436 * is set up to, or capable of handling them.
2439 pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
2440 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
2442 struct pcib_softc *sc = device_get_softc(dev);
2443 const char *name, *suffix;
2447 * Fail the allocation for this range if it's not supported.
2449 name = device_get_nameunit(child);
2456 case SYS_RES_IOPORT:
2458 if (!pcib_is_io_open(sc))
2460 ok = (start >= sc->iobase && end <= sc->iolimit);
2463 * Make sure we allow access to VGA I/O addresses when the
2464 * bridge has the "VGA Enable" bit set.
2466 if (!ok && pci_is_vga_ioport_range(start, end))
2467 ok = (sc->bridgectl & PCIB_BCR_VGA_ENABLE) ? 1 : 0;
2469 if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
2471 if (start < sc->iobase)
2473 if (end > sc->iolimit)
2482 * If we overlap with the subtractive range, then
2483 * pick the upper range to use.
2485 if (start < sc->iolimit && end > sc->iobase)
2486 start = sc->iolimit + 1;
2490 device_printf(dev, "ioport: end (%jx) < start (%jx)\n",
2497 device_printf(dev, "%s%srequested unsupported I/O "
2498 "range 0x%jx-0x%jx (decoding 0x%x-0x%x)\n",
2499 name, suffix, start, end, sc->iobase, sc->iolimit);
2504 "%s%srequested I/O range 0x%jx-0x%jx: in range\n",
2505 name, suffix, start, end);
2508 case SYS_RES_MEMORY:
2510 if (pcib_is_nonprefetch_open(sc))
2511 ok = ok || (start >= sc->membase && end <= sc->memlimit);
2512 if (pcib_is_prefetch_open(sc))
2513 ok = ok || (start >= sc->pmembase && end <= sc->pmemlimit);
2516 * Make sure we allow access to VGA memory addresses when the
2517 * bridge has the "VGA Enable" bit set.
2519 if (!ok && pci_is_vga_memory_range(start, end))
2520 ok = (sc->bridgectl & PCIB_BCR_VGA_ENABLE) ? 1 : 0;
2522 if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
2525 if (flags & RF_PREFETCHABLE) {
2526 if (pcib_is_prefetch_open(sc)) {
2527 if (start < sc->pmembase)
2528 start = sc->pmembase;
2529 if (end > sc->pmemlimit)
2530 end = sc->pmemlimit;
2534 } else { /* non-prefetchable */
2535 if (pcib_is_nonprefetch_open(sc)) {
2536 if (start < sc->membase)
2537 start = sc->membase;
2538 if (end > sc->memlimit)
2546 ok = 1; /* subtractive bridge: always ok */
2548 if (pcib_is_nonprefetch_open(sc)) {
2549 if (start < sc->memlimit && end > sc->membase)
2550 start = sc->memlimit + 1;
2552 if (pcib_is_prefetch_open(sc)) {
2553 if (start < sc->pmemlimit && end > sc->pmembase)
2554 start = sc->pmemlimit + 1;
2559 device_printf(dev, "memory: end (%jx) < start (%jx)\n",
2565 if (!ok && bootverbose)
2567 "%s%srequested unsupported memory range %#jx-%#jx "
2568 "(decoding %#jx-%#jx, %#jx-%#jx)\n",
2569 name, suffix, start, end,
2570 (uintmax_t)sc->membase, (uintmax_t)sc->memlimit,
2571 (uintmax_t)sc->pmembase, (uintmax_t)sc->pmemlimit);
2575 device_printf(dev,"%s%srequested memory range "
2576 "0x%jx-0x%jx: good\n",
2577 name, suffix, start, end);
2584 * Bridge is OK decoding this resource, so pass it up.
2586 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
2592 * If ARI is enabled on this downstream port, translate the function number
2593 * to the non-ARI slot/function. The downstream port will convert it back in
2594 * hardware. If ARI is not enabled slot and func are not modified.
2596 static __inline void
2597 pcib_xlate_ari(device_t pcib, int bus, int *slot, int *func)
2599 struct pcib_softc *sc;
2602 sc = device_get_softc(pcib);
2605 if (sc->flags & PCIB_ENABLE_ARI) {
2607 ("Non-zero slot number with ARI enabled!"));
2608 *slot = PCIE_ARI_SLOT(ari_func);
2609 *func = PCIE_ARI_FUNC(ari_func);
2614 pcib_enable_ari(struct pcib_softc *sc, uint32_t pcie_pos)
2618 ctl2 = pci_read_config(sc->dev, pcie_pos + PCIER_DEVICE_CTL2, 4);
2619 ctl2 |= PCIEM_CTL2_ARI;
2620 pci_write_config(sc->dev, pcie_pos + PCIER_DEVICE_CTL2, ctl2, 4);
2622 sc->flags |= PCIB_ENABLE_ARI;
2629 pcib_maxslots(device_t dev)
2631 #if !defined(__amd64__) && !defined(__i386__)
2636 * If this is a PCIe rootport or downstream switch port, there's only
2637 * one slot permitted.
2639 if (pci_find_cap(dev, PCIY_EXPRESS, &pcie_pos) == 0) {
2640 val = pci_read_config(dev, pcie_pos + PCIER_FLAGS, 2);
2641 val &= PCIEM_FLAGS_TYPE;
2642 if (val == PCIEM_TYPE_ROOT_PORT ||
2643 val == PCIEM_TYPE_DOWNSTREAM_PORT)
2647 return (PCI_SLOTMAX);
2651 pcib_ari_maxslots(device_t dev)
2653 struct pcib_softc *sc;
2655 sc = device_get_softc(dev);
2657 if (sc->flags & PCIB_ENABLE_ARI)
2658 return (PCIE_ARI_SLOTMAX);
2660 return (pcib_maxslots(dev));
2664 pcib_ari_maxfuncs(device_t dev)
2666 struct pcib_softc *sc;
2668 sc = device_get_softc(dev);
2670 if (sc->flags & PCIB_ENABLE_ARI)
2671 return (PCIE_ARI_FUNCMAX);
2673 return (PCI_FUNCMAX);
2677 pcib_ari_decode_rid(device_t pcib, uint16_t rid, int *bus, int *slot,
2680 struct pcib_softc *sc;
2682 sc = device_get_softc(pcib);
2684 *bus = PCI_RID2BUS(rid);
2685 if (sc->flags & PCIB_ENABLE_ARI) {
2686 *slot = PCIE_ARI_RID2SLOT(rid);
2687 *func = PCIE_ARI_RID2FUNC(rid);
2689 *slot = PCI_RID2SLOT(rid);
2690 *func = PCI_RID2FUNC(rid);
2695 * Since we are a child of a PCI bus, its parent must support the pcib interface.
2698 pcib_read_config(device_t dev, u_int b, u_int s, u_int f, u_int reg, int width)
2701 struct pcib_softc *sc;
2703 sc = device_get_softc(dev);
2704 if (!pcib_present(sc)) {
2711 return (0xffffffff);
2715 pcib_xlate_ari(dev, b, &s, &f);
2716 return(PCIB_READ_CONFIG(device_get_parent(device_get_parent(dev)), b, s,
2721 pcib_write_config(device_t dev, u_int b, u_int s, u_int f, u_int reg, uint32_t val, int width)
2724 struct pcib_softc *sc;
2726 sc = device_get_softc(dev);
2727 if (!pcib_present(sc))
2730 pcib_xlate_ari(dev, b, &s, &f);
2731 PCIB_WRITE_CONFIG(device_get_parent(device_get_parent(dev)), b, s, f,
2736 * Route an interrupt across a PCI bridge.
2739 pcib_route_interrupt(device_t pcib, device_t dev, int pin)
2747 * The PCI standard defines a swizzle of the child-side device/intpin to
2748 * the parent-side intpin as follows.
2750 * device = device on child bus
2751 * child_intpin = intpin on child bus slot (0-3)
2752 * parent_intpin = intpin on parent bus slot (0-3)
2754 * parent_intpin = (device + child_intpin) % 4
2756 parent_intpin = (pci_get_slot(dev) + (pin - 1)) % 4;
2759 * Our parent is a PCI bus. Its parent must export the pcib interface
2760 * which includes the ability to route interrupts.
2762 bus = device_get_parent(pcib);
2763 intnum = PCIB_ROUTE_INTERRUPT(device_get_parent(bus), pcib, parent_intpin + 1);
2764 if (PCI_INTERRUPT_VALID(intnum) && bootverbose) {
2765 device_printf(pcib, "slot %d INT%c is routed to irq %d\n",
2766 pci_get_slot(dev), 'A' + pin - 1, intnum);
2771 /* Pass request to alloc MSI/MSI-X messages up to the parent bridge. */
2773 pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
2775 struct pcib_softc *sc = device_get_softc(pcib);
2778 if (sc->flags & PCIB_DISABLE_MSI)
2780 bus = device_get_parent(pcib);
2781 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
2785 /* Pass request to release MSI/MSI-X messages up to the parent bridge. */
2787 pcib_release_msi(device_t pcib, device_t dev, int count, int *irqs)
2791 bus = device_get_parent(pcib);
2792 return (PCIB_RELEASE_MSI(device_get_parent(bus), dev, count, irqs));
2795 /* Pass request to alloc an MSI-X message up to the parent bridge. */
2797 pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
2799 struct pcib_softc *sc = device_get_softc(pcib);
2802 if (sc->flags & PCIB_DISABLE_MSIX)
2804 bus = device_get_parent(pcib);
2805 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
2808 /* Pass request to release an MSI-X message up to the parent bridge. */
2810 pcib_release_msix(device_t pcib, device_t dev, int irq)
2814 bus = device_get_parent(pcib);
2815 return (PCIB_RELEASE_MSIX(device_get_parent(bus), dev, irq));
2818 /* Pass request to map MSI/MSI-X message up to parent bridge. */
2820 pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
2826 bus = device_get_parent(pcib);
2827 error = PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data);
2831 pci_ht_map_msi(pcib, *addr);
2835 /* Pass request for device power state up to parent bridge. */
2837 pcib_power_for_sleep(device_t pcib, device_t dev, int *pstate)
2841 bus = device_get_parent(pcib);
2842 return (PCIB_POWER_FOR_SLEEP(bus, dev, pstate));
2846 pcib_ari_enabled(device_t pcib)
2848 struct pcib_softc *sc;
2850 sc = device_get_softc(pcib);
2852 return ((sc->flags & PCIB_ENABLE_ARI) != 0);
2856 pcib_ari_get_id(device_t pcib, device_t dev, enum pci_id_type type,
2859 struct pcib_softc *sc;
2861 uint8_t bus, slot, func;
2863 if (type != PCI_ID_RID) {
2864 bus_dev = device_get_parent(pcib);
2865 return (PCIB_GET_ID(device_get_parent(bus_dev), dev, type, id));
2868 sc = device_get_softc(pcib);
2870 if (sc->flags & PCIB_ENABLE_ARI) {
2871 bus = pci_get_bus(dev);
2872 func = pci_get_function(dev);
2874 *id = (PCI_ARI_RID(bus, func));
2876 bus = pci_get_bus(dev);
2877 slot = pci_get_slot(dev);
2878 func = pci_get_function(dev);
2880 *id = (PCI_RID(bus, slot, func));
2887 * Check that the downstream port (pcib) and the endpoint device (dev) both
2888 * support ARI. If so, enable it and return 0, otherwise return an error.
2891 pcib_try_enable_ari(device_t pcib, device_t dev)
2893 struct pcib_softc *sc;
2900 sc = device_get_softc(pcib);
2903 * ARI is controlled in a register in the PCIe capability structure.
2904 * If the downstream port does not have the PCIe capability structure
2905 * then it does not support ARI.
2907 error = pci_find_cap(pcib, PCIY_EXPRESS, &pcie_pos);
2911 /* Check that the PCIe port advertises ARI support. */
2912 cap2 = pci_read_config(pcib, pcie_pos + PCIER_DEVICE_CAP2, 4);
2913 if (!(cap2 & PCIEM_CAP2_ARI))
2917 * Check that the endpoint device advertises ARI support via the ARI
2918 * extended capability structure.
2920 error = pci_find_extcap(dev, PCIZ_ARI, &ari_cap_off);
2925 * Finally, check that the endpoint device supports the same version
2926 * of ARI that we do.
2928 ari_ver = pci_read_config(dev, ari_cap_off, 4);
2929 if (PCI_EXTCAP_VER(ari_ver) != PCIB_SUPPORTED_ARI_VER) {
2932 "Unsupported version of ARI (%d) detected\n",
2933 PCI_EXTCAP_VER(ari_ver));
2938 pcib_enable_ari(sc, pcie_pos);
2944 pcib_request_feature_allow(device_t pcib, device_t dev,
2945 enum pci_feature feature)
2948 * No host firmware we have to negotiate with, so we allow
2949 * every valid feature requested.
2952 case PCI_FEATURE_AER:
2953 case PCI_FEATURE_HP:
2963 pcib_request_feature(device_t dev, enum pci_feature feature)
2967 * Invoke PCIB_REQUEST_FEATURE of this bridge first in case
2968 * the firmware overrides the method of PCI-PCI bridges.
2970 return (PCIB_REQUEST_FEATURE(dev, dev, feature));
2974 * Pass the request to use this PCI feature up the tree. Either there's a
2975 * firmware like ACPI that's using this feature that will approve (or deny) the
2976 * request to take it over, or the platform has no such firmware, in which case
2977 * the request will be approved. If the request is approved, the OS is expected
2978 * to make use of the feature or render it harmless.
2981 pcib_request_feature_default(device_t pcib, device_t dev,
2982 enum pci_feature feature)
2987 * Our parent is necessarily a pci bus. Its parent will either be
2988 * another pci bridge (which passes it up) or a host bridge that can
2989 * approve or reject the request.
2991 bus = device_get_parent(pcib);
2992 return (PCIB_REQUEST_FEATURE(device_get_parent(bus), dev, feature));
2996 pcib_reset_child(device_t dev, device_t child, int flags)
2998 struct pci_devinfo *pdinfo;
3002 if (dev == NULL || device_get_parent(child) != dev)
3005 if (device_get_devclass(child) != devclass_find("pci"))
3007 pdinfo = device_get_ivars(dev);
3008 if (pdinfo->cfg.pcie.pcie_location != 0 &&
3009 (pdinfo->cfg.pcie.pcie_type == PCIEM_TYPE_DOWNSTREAM_PORT ||
3010 pdinfo->cfg.pcie.pcie_type == PCIEM_TYPE_ROOT_PORT)) {
3011 error = bus_helper_reset_prepare(child, flags);
3013 error = pcie_link_reset(dev,
3014 pdinfo->cfg.pcie.pcie_location);
3015 /* XXXKIB call _post even if error != 0 ? */
3016 bus_helper_reset_post(child, flags);