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freebsd-dev/sys/dev/pci/pci_pci.c
Andriy Gapon 12588ce02d PCI hot-plug: use dedicated taskqueue for device attach / detach 
Attaching and detaching devices can be heavy-weight and detaching can
sleep waiting for events.  For that reason using the system-wide
single-threaded taskqueue_thread is not really appropriate.
There is even a possibility for a deadlock if taskqueue_thread is used
for detaching.

In fact, there is an easy to reproduce deadlock involving nvme, pass
and a sudden removal of an NVMe device.
A pass peripheral would not release a reference on an nvme sim until
pass_shutdown_kqueue() is executed via taskqueue_thread.  But the
taskqueue's thread is blocked in nvme_detach() -> ... -> cam_sim_free()
because of the outstanding reference.

MFC after:	10 days
Sponsored by:	CyberSecure
Reviewed by:	mav, imp
Differential Revision:	https://reviews.freebsd.org/D30144
2021-05-06 21:49:37 +03:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
* Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
* Copyright (c) 2000 BSDi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* PCI:PCI bridge support.
*/
#include "opt_pci.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/pciio.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/taskqueue.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pci_private.h>
#include <dev/pci/pcib_private.h>
#include "pcib_if.h"
static int pcib_probe(device_t dev);
static int pcib_suspend(device_t dev);
static int pcib_resume(device_t dev);
static int pcib_power_for_sleep(device_t pcib, device_t dev,
int *pstate);
static int pcib_ari_get_id(device_t pcib, device_t dev,
enum pci_id_type type, uintptr_t *id);
static uint32_t pcib_read_config(device_t dev, u_int b, u_int s,
u_int f, u_int reg, int width);
static void pcib_write_config(device_t dev, u_int b, u_int s,
u_int f, u_int reg, uint32_t val, int width);
static int pcib_ari_maxslots(device_t dev);
static int pcib_ari_maxfuncs(device_t dev);
static int pcib_try_enable_ari(device_t pcib, device_t dev);
static int pcib_ari_enabled(device_t pcib);
static void pcib_ari_decode_rid(device_t pcib, uint16_t rid,
int *bus, int *slot, int *func);
#ifdef PCI_HP
static void pcib_pcie_ab_timeout(void *arg);
static void pcib_pcie_cc_timeout(void *arg);
static void pcib_pcie_dll_timeout(void *arg);
#endif
static int pcib_request_feature_default(device_t pcib, device_t dev,
enum pci_feature feature);
static int pcib_reset_child(device_t dev, device_t child, int flags);
static device_method_t pcib_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pcib_probe),
DEVMETHOD(device_attach, pcib_attach),
DEVMETHOD(device_detach, pcib_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, pcib_suspend),
DEVMETHOD(device_resume, pcib_resume),
/* Bus interface */
DEVMETHOD(bus_child_present, pcib_child_present),
DEVMETHOD(bus_read_ivar, pcib_read_ivar),
DEVMETHOD(bus_write_ivar, pcib_write_ivar),
DEVMETHOD(bus_alloc_resource, pcib_alloc_resource),
#ifdef NEW_PCIB
DEVMETHOD(bus_adjust_resource, pcib_adjust_resource),
DEVMETHOD(bus_release_resource, pcib_release_resource),
#else
DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
#endif
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD(bus_reset_child, pcib_reset_child),
/* pcib interface */
DEVMETHOD(pcib_maxslots, pcib_ari_maxslots),
DEVMETHOD(pcib_maxfuncs, pcib_ari_maxfuncs),
DEVMETHOD(pcib_read_config, pcib_read_config),
DEVMETHOD(pcib_write_config, pcib_write_config),
DEVMETHOD(pcib_route_interrupt, pcib_route_interrupt),
DEVMETHOD(pcib_alloc_msi, pcib_alloc_msi),
DEVMETHOD(pcib_release_msi, pcib_release_msi),
DEVMETHOD(pcib_alloc_msix, pcib_alloc_msix),
DEVMETHOD(pcib_release_msix, pcib_release_msix),
DEVMETHOD(pcib_map_msi, pcib_map_msi),
DEVMETHOD(pcib_power_for_sleep, pcib_power_for_sleep),
DEVMETHOD(pcib_get_id, pcib_ari_get_id),
DEVMETHOD(pcib_try_enable_ari, pcib_try_enable_ari),
DEVMETHOD(pcib_ari_enabled, pcib_ari_enabled),
DEVMETHOD(pcib_decode_rid, pcib_ari_decode_rid),
DEVMETHOD(pcib_request_feature, pcib_request_feature_default),
DEVMETHOD_END
};
static devclass_t pcib_devclass;
DEFINE_CLASS_0(pcib, pcib_driver, pcib_methods, sizeof(struct pcib_softc));
EARLY_DRIVER_MODULE(pcib, pci, pcib_driver, pcib_devclass, NULL, NULL,
BUS_PASS_BUS);
#if defined(NEW_PCIB) || defined(PCI_HP)
SYSCTL_DECL(_hw_pci);
#endif
#ifdef NEW_PCIB
static int pci_clear_pcib;
SYSCTL_INT(_hw_pci, OID_AUTO, clear_pcib, CTLFLAG_RDTUN, &pci_clear_pcib, 0,
"Clear firmware-assigned resources for PCI-PCI bridge I/O windows.");
/*
* Is a resource from a child device sub-allocated from one of our
* resource managers?
*/
static int
pcib_is_resource_managed(struct pcib_softc *sc, int type, struct resource *r)
{
switch (type) {
#ifdef PCI_RES_BUS
case PCI_RES_BUS:
return (rman_is_region_manager(r, &sc->bus.rman));
#endif
case SYS_RES_IOPORT:
return (rman_is_region_manager(r, &sc->io.rman));
case SYS_RES_MEMORY:
/* Prefetchable resources may live in either memory rman. */
if (rman_get_flags(r) & RF_PREFETCHABLE &&
rman_is_region_manager(r, &sc->pmem.rman))
return (1);
return (rman_is_region_manager(r, &sc->mem.rman));
}
return (0);
}
static int
pcib_is_window_open(struct pcib_window *pw)
{
return (pw->valid && pw->base < pw->limit);
}
/*
* XXX: If RF_ACTIVE did not also imply allocating a bus space tag and
* handle for the resource, we could pass RF_ACTIVE up to the PCI bus
* when allocating the resource windows and rely on the PCI bus driver
* to do this for us.
*/
static void
pcib_activate_window(struct pcib_softc *sc, int type)
{
PCI_ENABLE_IO(device_get_parent(sc->dev), sc->dev, type);
}
static void
pcib_write_windows(struct pcib_softc *sc, int mask)
{
device_t dev;
uint32_t val;
dev = sc->dev;
if (sc->io.valid && mask & WIN_IO) {
val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
pci_write_config(dev, PCIR_IOBASEH_1,
sc->io.base >> 16, 2);
pci_write_config(dev, PCIR_IOLIMITH_1,
sc->io.limit >> 16, 2);
}
pci_write_config(dev, PCIR_IOBASEL_1, sc->io.base >> 8, 1);
pci_write_config(dev, PCIR_IOLIMITL_1, sc->io.limit >> 8, 1);
}
if (mask & WIN_MEM) {
pci_write_config(dev, PCIR_MEMBASE_1, sc->mem.base >> 16, 2);
pci_write_config(dev, PCIR_MEMLIMIT_1, sc->mem.limit >> 16, 2);
}
if (sc->pmem.valid && mask & WIN_PMEM) {
val = pci_read_config(dev, PCIR_PMBASEL_1, 2);
if ((val & PCIM_BRPM_MASK) == PCIM_BRPM_64) {
pci_write_config(dev, PCIR_PMBASEH_1,
sc->pmem.base >> 32, 4);
pci_write_config(dev, PCIR_PMLIMITH_1,
sc->pmem.limit >> 32, 4);
}
pci_write_config(dev, PCIR_PMBASEL_1, sc->pmem.base >> 16, 2);
pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmem.limit >> 16, 2);
}
}
/*
* This is used to reject I/O port allocations that conflict with an
* ISA alias range.
*/
static int
pcib_is_isa_range(struct pcib_softc *sc, rman_res_t start, rman_res_t end,
rman_res_t count)
{
rman_res_t next_alias;
if (!(sc->bridgectl & PCIB_BCR_ISA_ENABLE))
return (0);
/* Only check fixed ranges for overlap. */
if (start + count - 1 != end)
return (0);
/* ISA aliases are only in the lower 64KB of I/O space. */
if (start >= 65536)
return (0);
/* Check for overlap with 0x000 - 0x0ff as a special case. */
if (start < 0x100)
goto alias;
/*
* If the start address is an alias, the range is an alias.
* Otherwise, compute the start of the next alias range and
* check if it is before the end of the candidate range.
*/
if ((start & 0x300) != 0)
goto alias;
next_alias = (start & ~0x3fful) | 0x100;
if (next_alias <= end)
goto alias;
return (0);
alias:
if (bootverbose)
device_printf(sc->dev,
"I/O range %#jx-%#jx overlaps with an ISA alias\n", start,
end);
return (1);
}
static void
pcib_add_window_resources(struct pcib_window *w, struct resource **res,
int count)
{
struct resource **newarray;
int error, i;
newarray = malloc(sizeof(struct resource *) * (w->count + count),
M_DEVBUF, M_WAITOK);
if (w->res != NULL)
bcopy(w->res, newarray, sizeof(struct resource *) * w->count);
bcopy(res, newarray + w->count, sizeof(struct resource *) * count);
free(w->res, M_DEVBUF);
w->res = newarray;
w->count += count;
for (i = 0; i < count; i++) {
error = rman_manage_region(&w->rman, rman_get_start(res[i]),
rman_get_end(res[i]));
if (error)
panic("Failed to add resource to rman");
}
}
typedef void (nonisa_callback)(rman_res_t start, rman_res_t end, void *arg);
static void
pcib_walk_nonisa_ranges(rman_res_t start, rman_res_t end, nonisa_callback *cb,
void *arg)
{
rman_res_t next_end;
/*
* If start is within an ISA alias range, move up to the start
* of the next non-alias range. As a special case, addresses
* in the range 0x000 - 0x0ff should also be skipped since
* those are used for various system I/O devices in ISA
* systems.
*/
if (start <= 65535) {
if (start < 0x100 || (start & 0x300) != 0) {
start &= ~0x3ff;
start += 0x400;
}
}
/* ISA aliases are only in the lower 64KB of I/O space. */
while (start <= MIN(end, 65535)) {
next_end = MIN(start | 0xff, end);
cb(start, next_end, arg);
start += 0x400;
}
if (start <= end)
cb(start, end, arg);
}
static void
count_ranges(rman_res_t start, rman_res_t end, void *arg)
{
int *countp;
countp = arg;
(*countp)++;
}
struct alloc_state {
struct resource **res;
struct pcib_softc *sc;
int count, error;
};
static void
alloc_ranges(rman_res_t start, rman_res_t end, void *arg)
{
struct alloc_state *as;
struct pcib_window *w;
int rid;
as = arg;
if (as->error != 0)
return;
w = &as->sc->io;
rid = w->reg;
if (bootverbose)
device_printf(as->sc->dev,
"allocating non-ISA range %#jx-%#jx\n", start, end);
as->res[as->count] = bus_alloc_resource(as->sc->dev, SYS_RES_IOPORT,
&rid, start, end, end - start + 1, 0);
if (as->res[as->count] == NULL)
as->error = ENXIO;
else
as->count++;
}
static int
pcib_alloc_nonisa_ranges(struct pcib_softc *sc, rman_res_t start, rman_res_t end)
{
struct alloc_state as;
int i, new_count;
/* First, see how many ranges we need. */
new_count = 0;
pcib_walk_nonisa_ranges(start, end, count_ranges, &new_count);
/* Second, allocate the ranges. */
as.res = malloc(sizeof(struct resource *) * new_count, M_DEVBUF,
M_WAITOK);
as.sc = sc;
as.count = 0;
as.error = 0;
pcib_walk_nonisa_ranges(start, end, alloc_ranges, &as);
if (as.error != 0) {
for (i = 0; i < as.count; i++)
bus_release_resource(sc->dev, SYS_RES_IOPORT,
sc->io.reg, as.res[i]);
free(as.res, M_DEVBUF);
return (as.error);
}
KASSERT(as.count == new_count, ("%s: count mismatch", __func__));
/* Third, add the ranges to the window. */
pcib_add_window_resources(&sc->io, as.res, as.count);
free(as.res, M_DEVBUF);
return (0);
}
static void
pcib_alloc_window(struct pcib_softc *sc, struct pcib_window *w, int type,
int flags, pci_addr_t max_address)
{
struct resource *res;
char buf[64];
int error, rid;
if (max_address != (rman_res_t)max_address)
max_address = ~0;
w->rman.rm_start = 0;
w->rman.rm_end = max_address;
w->rman.rm_type = RMAN_ARRAY;
snprintf(buf, sizeof(buf), "%s %s window",
device_get_nameunit(sc->dev), w->name);
w->rman.rm_descr = strdup(buf, M_DEVBUF);
error = rman_init(&w->rman);
if (error)
panic("Failed to initialize %s %s rman",
device_get_nameunit(sc->dev), w->name);
if (!pcib_is_window_open(w))
return;
if (w->base > max_address || w->limit > max_address) {
device_printf(sc->dev,
"initial %s window has too many bits, ignoring\n", w->name);
return;
}
if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE)
(void)pcib_alloc_nonisa_ranges(sc, w->base, w->limit);
else {
rid = w->reg;
res = bus_alloc_resource(sc->dev, type, &rid, w->base, w->limit,
w->limit - w->base + 1, flags);
if (res != NULL)
pcib_add_window_resources(w, &res, 1);
}
if (w->res == NULL) {
device_printf(sc->dev,
"failed to allocate initial %s window: %#jx-%#jx\n",
w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
w->base = max_address;
w->limit = 0;
pcib_write_windows(sc, w->mask);
return;
}
pcib_activate_window(sc, type);
}
/*
* Initialize I/O windows.
*/
static void
pcib_probe_windows(struct pcib_softc *sc)
{
pci_addr_t max;
device_t dev;
uint32_t val;
dev = sc->dev;
if (pci_clear_pcib) {
pcib_bridge_init(dev);
}
/* Determine if the I/O port window is implemented. */
val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
if (val == 0) {
/*
* If 'val' is zero, then only 16-bits of I/O space
* are supported.
*/
pci_write_config(dev, PCIR_IOBASEL_1, 0xff, 1);
if (pci_read_config(dev, PCIR_IOBASEL_1, 1) != 0) {
sc->io.valid = 1;
pci_write_config(dev, PCIR_IOBASEL_1, 0, 1);
}
} else
sc->io.valid = 1;
/* Read the existing I/O port window. */
if (sc->io.valid) {
sc->io.reg = PCIR_IOBASEL_1;
sc->io.step = 12;
sc->io.mask = WIN_IO;
sc->io.name = "I/O port";
if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
sc->io.base = PCI_PPBIOBASE(
pci_read_config(dev, PCIR_IOBASEH_1, 2), val);
sc->io.limit = PCI_PPBIOLIMIT(
pci_read_config(dev, PCIR_IOLIMITH_1, 2),
pci_read_config(dev, PCIR_IOLIMITL_1, 1));
max = 0xffffffff;
} else {
sc->io.base = PCI_PPBIOBASE(0, val);
sc->io.limit = PCI_PPBIOLIMIT(0,
pci_read_config(dev, PCIR_IOLIMITL_1, 1));
max = 0xffff;
}
pcib_alloc_window(sc, &sc->io, SYS_RES_IOPORT, 0, max);
}
/* Read the existing memory window. */
sc->mem.valid = 1;
sc->mem.reg = PCIR_MEMBASE_1;
sc->mem.step = 20;
sc->mem.mask = WIN_MEM;
sc->mem.name = "memory";
sc->mem.base = PCI_PPBMEMBASE(0,
pci_read_config(dev, PCIR_MEMBASE_1, 2));
sc->mem.limit = PCI_PPBMEMLIMIT(0,
pci_read_config(dev, PCIR_MEMLIMIT_1, 2));
pcib_alloc_window(sc, &sc->mem, SYS_RES_MEMORY, 0, 0xffffffff);
/* Determine if the prefetchable memory window is implemented. */
val = pci_read_config(dev, PCIR_PMBASEL_1, 2);
if (val == 0) {
/*
* If 'val' is zero, then only 32-bits of memory space
* are supported.
*/
pci_write_config(dev, PCIR_PMBASEL_1, 0xffff, 2);
if (pci_read_config(dev, PCIR_PMBASEL_1, 2) != 0) {
sc->pmem.valid = 1;
pci_write_config(dev, PCIR_PMBASEL_1, 0, 2);
}
} else
sc->pmem.valid = 1;
/* Read the existing prefetchable memory window. */
if (sc->pmem.valid) {
sc->pmem.reg = PCIR_PMBASEL_1;
sc->pmem.step = 20;
sc->pmem.mask = WIN_PMEM;
sc->pmem.name = "prefetch";
if ((val & PCIM_BRPM_MASK) == PCIM_BRPM_64) {
sc->pmem.base = PCI_PPBMEMBASE(
pci_read_config(dev, PCIR_PMBASEH_1, 4), val);
sc->pmem.limit = PCI_PPBMEMLIMIT(
pci_read_config(dev, PCIR_PMLIMITH_1, 4),
pci_read_config(dev, PCIR_PMLIMITL_1, 2));
max = 0xffffffffffffffff;
} else {
sc->pmem.base = PCI_PPBMEMBASE(0, val);
sc->pmem.limit = PCI_PPBMEMLIMIT(0,
pci_read_config(dev, PCIR_PMLIMITL_1, 2));
max = 0xffffffff;
}
pcib_alloc_window(sc, &sc->pmem, SYS_RES_MEMORY,
RF_PREFETCHABLE, max);
}
}
static void
pcib_release_window(struct pcib_softc *sc, struct pcib_window *w, int type)
{
device_t dev;
int error, i;
if (!w->valid)
return;
dev = sc->dev;
error = rman_fini(&w->rman);
if (error) {
device_printf(dev, "failed to release %s rman\n", w->name);
return;
}
free(__DECONST(char *, w->rman.rm_descr), M_DEVBUF);
for (i = 0; i < w->count; i++) {
error = bus_free_resource(dev, type, w->res[i]);
if (error)
device_printf(dev,
"failed to release %s resource: %d\n", w->name,
error);
}
free(w->res, M_DEVBUF);
}
static void
pcib_free_windows(struct pcib_softc *sc)
{
pcib_release_window(sc, &sc->pmem, SYS_RES_MEMORY);
pcib_release_window(sc, &sc->mem, SYS_RES_MEMORY);
pcib_release_window(sc, &sc->io, SYS_RES_IOPORT);
}
#ifdef PCI_RES_BUS
/*
* Allocate a suitable secondary bus for this bridge if needed and
* initialize the resource manager for the secondary bus range. Note
* that the minimum count is a desired value and this may allocate a
* smaller range.
*/
void
pcib_setup_secbus(device_t dev, struct pcib_secbus *bus, int min_count)
{
char buf[64];
int error, rid, sec_reg;
switch (pci_read_config(dev, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE) {
case PCIM_HDRTYPE_BRIDGE:
sec_reg = PCIR_SECBUS_1;
bus->sub_reg = PCIR_SUBBUS_1;
break;
case PCIM_HDRTYPE_CARDBUS:
sec_reg = PCIR_SECBUS_2;
bus->sub_reg = PCIR_SUBBUS_2;
break;
default:
panic("not a PCI bridge");
}
bus->sec = pci_read_config(dev, sec_reg, 1);
bus->sub = pci_read_config(dev, bus->sub_reg, 1);
bus->dev = dev;
bus->rman.rm_start = 0;
bus->rman.rm_end = PCI_BUSMAX;
bus->rman.rm_type = RMAN_ARRAY;
snprintf(buf, sizeof(buf), "%s bus numbers", device_get_nameunit(dev));
bus->rman.rm_descr = strdup(buf, M_DEVBUF);
error = rman_init(&bus->rman);
if (error)
panic("Failed to initialize %s bus number rman",
device_get_nameunit(dev));
/*
* Allocate a bus range. This will return an existing bus range
* if one exists, or a new bus range if one does not.
*/
rid = 0;
bus->res = bus_alloc_resource_anywhere(dev, PCI_RES_BUS, &rid,
min_count, 0);
if (bus->res == NULL) {
/*
* Fall back to just allocating a range of a single bus
* number.
*/
bus->res = bus_alloc_resource_anywhere(dev, PCI_RES_BUS, &rid,
1, 0);
} else if (rman_get_size(bus->res) < min_count)
/*
* Attempt to grow the existing range to satisfy the
* minimum desired count.
*/
(void)bus_adjust_resource(dev, PCI_RES_BUS, bus->res,
rman_get_start(bus->res), rman_get_start(bus->res) +
min_count - 1);
/*
* Add the initial resource to the rman.
*/
if (bus->res != NULL) {
error = rman_manage_region(&bus->rman, rman_get_start(bus->res),
rman_get_end(bus->res));
if (error)
panic("Failed to add resource to rman");
bus->sec = rman_get_start(bus->res);
bus->sub = rman_get_end(bus->res);
}
}
void
pcib_free_secbus(device_t dev, struct pcib_secbus *bus)
{
int error;
error = rman_fini(&bus->rman);
if (error) {
device_printf(dev, "failed to release bus number rman\n");
return;
}
free(__DECONST(char *, bus->rman.rm_descr), M_DEVBUF);
error = bus_free_resource(dev, PCI_RES_BUS, bus->res);
if (error)
device_printf(dev,
"failed to release bus numbers resource: %d\n", error);
}
static struct resource *
pcib_suballoc_bus(struct pcib_secbus *bus, device_t child, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct resource *res;
res = rman_reserve_resource(&bus->rman, start, end, count, flags,
child);
if (res == NULL)
return (NULL);
if (bootverbose)
device_printf(bus->dev,
"allocated bus range (%ju-%ju) for rid %d of %s\n",
rman_get_start(res), rman_get_end(res), *rid,
pcib_child_name(child));
rman_set_rid(res, *rid);
return (res);
}
/*
* Attempt to grow the secondary bus range. This is much simpler than
* for I/O windows as the range can only be grown by increasing
* subbus.
*/
static int
pcib_grow_subbus(struct pcib_secbus *bus, rman_res_t new_end)
{
rman_res_t old_end;
int error;
old_end = rman_get_end(bus->res);
KASSERT(new_end > old_end, ("attempt to shrink subbus"));
error = bus_adjust_resource(bus->dev, PCI_RES_BUS, bus->res,
rman_get_start(bus->res), new_end);
if (error)
return (error);
if (bootverbose)
device_printf(bus->dev, "grew bus range to %ju-%ju\n",
rman_get_start(bus->res), rman_get_end(bus->res));
error = rman_manage_region(&bus->rman, old_end + 1,
rman_get_end(bus->res));
if (error)
panic("Failed to add resource to rman");
bus->sub = rman_get_end(bus->res);
pci_write_config(bus->dev, bus->sub_reg, bus->sub, 1);
return (0);
}
struct resource *
pcib_alloc_subbus(struct pcib_secbus *bus, device_t child, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct resource *res;
rman_res_t start_free, end_free, new_end;
/*
* First, see if the request can be satisified by the existing
* bus range.
*/
res = pcib_suballoc_bus(bus, child, rid, start, end, count, flags);
if (res != NULL)
return (res);
/*
* Figure out a range to grow the bus range. First, find the
* first bus number after the last allocated bus in the rman and
* enforce that as a minimum starting point for the range.
*/
if (rman_last_free_region(&bus->rman, &start_free, &end_free) != 0 ||
end_free != bus->sub)
start_free = bus->sub + 1;
if (start_free < start)
start_free = start;
new_end = start_free + count - 1;
/*
* See if this new range would satisfy the request if it
* succeeds.
*/
if (new_end > end)
return (NULL);
/* Finally, attempt to grow the existing resource. */
if (bootverbose) {
device_printf(bus->dev,
"attempting to grow bus range for %ju buses\n", count);
printf("\tback candidate range: %ju-%ju\n", start_free,
new_end);
}
if (pcib_grow_subbus(bus, new_end) == 0)
return (pcib_suballoc_bus(bus, child, rid, start, end, count,
flags));
return (NULL);
}
#endif
#else
/*
* Is the prefetch window open (eg, can we allocate memory in it?)
*/
static int
pcib_is_prefetch_open(struct pcib_softc *sc)
{
return (sc->pmembase > 0 && sc->pmembase < sc->pmemlimit);
}
/*
* Is the nonprefetch window open (eg, can we allocate memory in it?)
*/
static int
pcib_is_nonprefetch_open(struct pcib_softc *sc)
{
return (sc->membase > 0 && sc->membase < sc->memlimit);
}
/*
* Is the io window open (eg, can we allocate ports in it?)
*/
static int
pcib_is_io_open(struct pcib_softc *sc)
{
return (sc->iobase > 0 && sc->iobase < sc->iolimit);
}
/*
* Get current I/O decode.
*/
static void
pcib_get_io_decode(struct pcib_softc *sc)
{
device_t dev;
uint32_t iolow;
dev = sc->dev;
iolow = pci_read_config(dev, PCIR_IOBASEL_1, 1);
if ((iolow & PCIM_BRIO_MASK) == PCIM_BRIO_32)
sc->iobase = PCI_PPBIOBASE(
pci_read_config(dev, PCIR_IOBASEH_1, 2), iolow);
else
sc->iobase = PCI_PPBIOBASE(0, iolow);
iolow = pci_read_config(dev, PCIR_IOLIMITL_1, 1);
if ((iolow & PCIM_BRIO_MASK) == PCIM_BRIO_32)
sc->iolimit = PCI_PPBIOLIMIT(
pci_read_config(dev, PCIR_IOLIMITH_1, 2), iolow);
else
sc->iolimit = PCI_PPBIOLIMIT(0, iolow);
}
/*
* Get current memory decode.
*/
static void
pcib_get_mem_decode(struct pcib_softc *sc)
{
device_t dev;
pci_addr_t pmemlow;
dev = sc->dev;
sc->membase = PCI_PPBMEMBASE(0,
pci_read_config(dev, PCIR_MEMBASE_1, 2));
sc->memlimit = PCI_PPBMEMLIMIT(0,
pci_read_config(dev, PCIR_MEMLIMIT_1, 2));
pmemlow = pci_read_config(dev, PCIR_PMBASEL_1, 2);
if ((pmemlow & PCIM_BRPM_MASK) == PCIM_BRPM_64)
sc->pmembase = PCI_PPBMEMBASE(
pci_read_config(dev, PCIR_PMBASEH_1, 4), pmemlow);
else
sc->pmembase = PCI_PPBMEMBASE(0, pmemlow);
pmemlow = pci_read_config(dev, PCIR_PMLIMITL_1, 2);
if ((pmemlow & PCIM_BRPM_MASK) == PCIM_BRPM_64)
sc->pmemlimit = PCI_PPBMEMLIMIT(
pci_read_config(dev, PCIR_PMLIMITH_1, 4), pmemlow);
else
sc->pmemlimit = PCI_PPBMEMLIMIT(0, pmemlow);
}
/*
* Restore previous I/O decode.
*/
static void
pcib_set_io_decode(struct pcib_softc *sc)
{
device_t dev;
uint32_t iohi;
dev = sc->dev;
iohi = sc->iobase >> 16;
if (iohi > 0)
pci_write_config(dev, PCIR_IOBASEH_1, iohi, 2);
pci_write_config(dev, PCIR_IOBASEL_1, sc->iobase >> 8, 1);
iohi = sc->iolimit >> 16;
if (iohi > 0)
pci_write_config(dev, PCIR_IOLIMITH_1, iohi, 2);
pci_write_config(dev, PCIR_IOLIMITL_1, sc->iolimit >> 8, 1);
}
/*
* Restore previous memory decode.
*/
static void
pcib_set_mem_decode(struct pcib_softc *sc)
{
device_t dev;
pci_addr_t pmemhi;
dev = sc->dev;
pci_write_config(dev, PCIR_MEMBASE_1, sc->membase >> 16, 2);
pci_write_config(dev, PCIR_MEMLIMIT_1, sc->memlimit >> 16, 2);
pmemhi = sc->pmembase >> 32;
if (pmemhi > 0)
pci_write_config(dev, PCIR_PMBASEH_1, pmemhi, 4);
pci_write_config(dev, PCIR_PMBASEL_1, sc->pmembase >> 16, 2);
pmemhi = sc->pmemlimit >> 32;
if (pmemhi > 0)
pci_write_config(dev, PCIR_PMLIMITH_1, pmemhi, 4);
pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmemlimit >> 16, 2);
}
#endif
#ifdef PCI_HP
/*
* PCI-express HotPlug support.
*/
static int pci_enable_pcie_hp = 1;
SYSCTL_INT(_hw_pci, OID_AUTO, enable_pcie_hp, CTLFLAG_RDTUN,
&pci_enable_pcie_hp, 0,
"Enable support for native PCI-express HotPlug.");
TASKQUEUE_DEFINE_THREAD(pci_hp);
static void
pcib_probe_hotplug(struct pcib_softc *sc)
{
device_t dev;
uint32_t link_cap;
uint16_t link_sta, slot_sta;
if (!pci_enable_pcie_hp)
return;
dev = sc->dev;
if (pci_find_cap(dev, PCIY_EXPRESS, NULL) != 0)
return;
if (!(pcie_read_config(dev, PCIER_FLAGS, 2) & PCIEM_FLAGS_SLOT))
return;
sc->pcie_slot_cap = pcie_read_config(dev, PCIER_SLOT_CAP, 4);
if ((sc->pcie_slot_cap & PCIEM_SLOT_CAP_HPC) == 0)
return;
link_cap = pcie_read_config(dev, PCIER_LINK_CAP, 4);
if ((link_cap & PCIEM_LINK_CAP_DL_ACTIVE) == 0)
return;
/*
* Some devices report that they have an MRL when they actually
* do not. Since they always report that the MRL is open, child
* devices would be ignored. Try to detect these devices and
* ignore their claim of HotPlug support.
*
* If there is an open MRL but the Data Link Layer is active,
* the MRL is not real.
*/
if ((sc->pcie_slot_cap & PCIEM_SLOT_CAP_MRLSP) != 0) {
link_sta = pcie_read_config(dev, PCIER_LINK_STA, 2);
slot_sta = pcie_read_config(dev, PCIER_SLOT_STA, 2);
if ((slot_sta & PCIEM_SLOT_STA_MRLSS) != 0 &&
(link_sta & PCIEM_LINK_STA_DL_ACTIVE) != 0) {
return;
}
}
/*
* Now that we're sure we want to do hot plug, ask the
* firmware, if any, if that's OK.
*/
if (pcib_request_feature(dev, PCI_FEATURE_HP) != 0) {
if (bootverbose)
device_printf(dev, "Unable to activate hot plug feature.\n");
return;
}
sc->flags |= PCIB_HOTPLUG;
}
/*
* Send a HotPlug command to the slot control register. If this slot
* uses command completion interrupts and a previous command is still
* in progress, then the command is dropped. Once the previous
* command completes or times out, pcib_pcie_hotplug_update() will be
* invoked to post a new command based on the slot's state at that
* time.
*/
static void
pcib_pcie_hotplug_command(struct pcib_softc *sc, uint16_t val, uint16_t mask)
{
device_t dev;
uint16_t ctl, new;
dev = sc->dev;
if (sc->flags & PCIB_HOTPLUG_CMD_PENDING)
return;
ctl = pcie_read_config(dev, PCIER_SLOT_CTL, 2);
new = (ctl & ~mask) | val;
if (new == ctl)
return;
if (bootverbose)
device_printf(dev, "HotPlug command: %04x -> %04x\n", ctl, new);
pcie_write_config(dev, PCIER_SLOT_CTL, new, 2);
if (!(sc->pcie_slot_cap & PCIEM_SLOT_CAP_NCCS) &&
(ctl & new) & PCIEM_SLOT_CTL_CCIE) {
sc->flags |= PCIB_HOTPLUG_CMD_PENDING;
if (!cold)
callout_reset(&sc->pcie_cc_timer, hz,
pcib_pcie_cc_timeout, sc);
}
}
static void
pcib_pcie_hotplug_command_completed(struct pcib_softc *sc)
{
device_t dev;
dev = sc->dev;
if (bootverbose)
device_printf(dev, "Command Completed\n");
if (!(sc->flags & PCIB_HOTPLUG_CMD_PENDING))
return;
callout_stop(&sc->pcie_cc_timer);
sc->flags &= ~PCIB_HOTPLUG_CMD_PENDING;
wakeup(sc);
}
/*
* Returns true if a card is fully inserted from the user's
* perspective. It may not yet be ready for access, but the driver
* can now start enabling access if necessary.
*/
static bool
pcib_hotplug_inserted(struct pcib_softc *sc)
{
/* Pretend the card isn't present if a detach is forced. */
if (sc->flags & PCIB_DETACHING)
return (false);
/* Card must be present in the slot. */
if ((sc->pcie_slot_sta & PCIEM_SLOT_STA_PDS) == 0)
return (false);
/* A power fault implicitly turns off power to the slot. */
if (sc->pcie_slot_sta & PCIEM_SLOT_STA_PFD)
return (false);
/* If the MRL is disengaged, the slot is powered off. */
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_MRLSP &&
(sc->pcie_slot_sta & PCIEM_SLOT_STA_MRLSS) != 0)
return (false);
return (true);
}
/*
* Returns -1 if the card is fully inserted, powered, and ready for
* access. Otherwise, returns 0.
*/
static int
pcib_hotplug_present(struct pcib_softc *sc)
{
/* Card must be inserted. */
if (!pcib_hotplug_inserted(sc))
return (0);
/* Require the Data Link Layer to be active. */
if (!(sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE))
return (0);
return (-1);
}
static void
pcib_pcie_hotplug_update(struct pcib_softc *sc, uint16_t val, uint16_t mask,
bool schedule_task)
{
bool card_inserted, ei_engaged;
/* Clear DETACHING if Presence Detect has cleared. */
if ((sc->pcie_slot_sta & (PCIEM_SLOT_STA_PDC | PCIEM_SLOT_STA_PDS)) ==
PCIEM_SLOT_STA_PDC)
sc->flags &= ~PCIB_DETACHING;
card_inserted = pcib_hotplug_inserted(sc);
/* Turn the power indicator on if a card is inserted. */
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_PIP) {
mask |= PCIEM_SLOT_CTL_PIC;
if (card_inserted)
val |= PCIEM_SLOT_CTL_PI_ON;
else if (sc->flags & PCIB_DETACH_PENDING)
val |= PCIEM_SLOT_CTL_PI_BLINK;
else
val |= PCIEM_SLOT_CTL_PI_OFF;
}
/* Turn the power on via the Power Controller if a card is inserted. */
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_PCP) {
mask |= PCIEM_SLOT_CTL_PCC;
if (card_inserted)
val |= PCIEM_SLOT_CTL_PC_ON;
else
val |= PCIEM_SLOT_CTL_PC_OFF;
}
/*
* If a card is inserted, enable the Electromechanical
* Interlock. If a card is not inserted (or we are in the
* process of detaching), disable the Electromechanical
* Interlock.
*/
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_EIP) {
mask |= PCIEM_SLOT_CTL_EIC;
ei_engaged = (sc->pcie_slot_sta & PCIEM_SLOT_STA_EIS) != 0;
if (card_inserted != ei_engaged)
val |= PCIEM_SLOT_CTL_EIC;
}
/*
* Start a timer to see if the Data Link Layer times out.
* Note that we only start the timer if Presence Detect or MRL Sensor
* changed on this interrupt. Stop any scheduled timer if
* the Data Link Layer is active.
*/
if (card_inserted &&
!(sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE) &&
sc->pcie_slot_sta &
(PCIEM_SLOT_STA_MRLSC | PCIEM_SLOT_STA_PDC)) {
if (cold)
device_printf(sc->dev,
"Data Link Layer inactive\n");
else
callout_reset(&sc->pcie_dll_timer, hz,
pcib_pcie_dll_timeout, sc);
} else if (sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE)
callout_stop(&sc->pcie_dll_timer);
pcib_pcie_hotplug_command(sc, val, mask);
/*
* During attach the child "pci" device is added synchronously;
* otherwise, the task is scheduled to manage the child
* device.
*/
if (schedule_task &&
(pcib_hotplug_present(sc) != 0) != (sc->child != NULL))
taskqueue_enqueue(taskqueue_pci_hp, &sc->pcie_hp_task);
}
static void
pcib_pcie_intr_hotplug(void *arg)
{
struct pcib_softc *sc;
device_t dev;
uint16_t old_slot_sta;
sc = arg;
dev = sc->dev;
PCIB_HP_LOCK(sc);
old_slot_sta = sc->pcie_slot_sta;
sc->pcie_slot_sta = pcie_read_config(dev, PCIER_SLOT_STA, 2);
/* Clear the events just reported. */
pcie_write_config(dev, PCIER_SLOT_STA, sc->pcie_slot_sta, 2);
if (bootverbose)
device_printf(dev, "HotPlug interrupt: %#x\n",
sc->pcie_slot_sta);
if (sc->pcie_slot_sta & PCIEM_SLOT_STA_ABP) {
if (sc->flags & PCIB_DETACH_PENDING) {
device_printf(dev,
"Attention Button Pressed: Detach Cancelled\n");
sc->flags &= ~PCIB_DETACH_PENDING;
callout_stop(&sc->pcie_ab_timer);
} else if (old_slot_sta & PCIEM_SLOT_STA_PDS) {
/* Only initiate detach sequence if device present. */
device_printf(dev,
"Attention Button Pressed: Detaching in 5 seconds\n");
sc->flags |= PCIB_DETACH_PENDING;
callout_reset(&sc->pcie_ab_timer, 5 * hz,
pcib_pcie_ab_timeout, sc);
}
}
if (sc->pcie_slot_sta & PCIEM_SLOT_STA_PFD)
device_printf(dev, "Power Fault Detected\n");
if (sc->pcie_slot_sta & PCIEM_SLOT_STA_MRLSC)
device_printf(dev, "MRL Sensor Changed to %s\n",
sc->pcie_slot_sta & PCIEM_SLOT_STA_MRLSS ? "open" :
"closed");
if (bootverbose && sc->pcie_slot_sta & PCIEM_SLOT_STA_PDC)
device_printf(dev, "Presence Detect Changed to %s\n",
sc->pcie_slot_sta & PCIEM_SLOT_STA_PDS ? "card present" :
"empty");
if (sc->pcie_slot_sta & PCIEM_SLOT_STA_CC)
pcib_pcie_hotplug_command_completed(sc);
if (sc->pcie_slot_sta & PCIEM_SLOT_STA_DLLSC) {
sc->pcie_link_sta = pcie_read_config(dev, PCIER_LINK_STA, 2);
if (bootverbose)
device_printf(dev,
"Data Link Layer State Changed to %s\n",
sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE ?
"active" : "inactive");
}
pcib_pcie_hotplug_update(sc, 0, 0, true);
PCIB_HP_UNLOCK(sc);
}
static void
pcib_pcie_hotplug_task(void *context, int pending)
{
struct pcib_softc *sc;
device_t dev;
sc = context;
PCIB_HP_LOCK(sc);
dev = sc->dev;
if (pcib_hotplug_present(sc) != 0) {
if (sc->child == NULL) {
sc->child = device_add_child(dev, "pci", -1);
bus_generic_attach(dev);
}
} else {
if (sc->child != NULL) {
if (device_delete_child(dev, sc->child) == 0)
sc->child = NULL;
}
}
PCIB_HP_UNLOCK(sc);
}
static void
pcib_pcie_ab_timeout(void *arg)
{
struct pcib_softc *sc;
sc = arg;
PCIB_HP_LOCK_ASSERT(sc);
if (sc->flags & PCIB_DETACH_PENDING) {
sc->flags |= PCIB_DETACHING;
sc->flags &= ~PCIB_DETACH_PENDING;
pcib_pcie_hotplug_update(sc, 0, 0, true);
}
}
static void
pcib_pcie_cc_timeout(void *arg)
{
struct pcib_softc *sc;
device_t dev;
uint16_t sta;
sc = arg;
dev = sc->dev;
PCIB_HP_LOCK_ASSERT(sc);
sta = pcie_read_config(dev, PCIER_SLOT_STA, 2);
if (!(sta & PCIEM_SLOT_STA_CC)) {
device_printf(dev, "HotPlug Command Timed Out\n");
sc->flags &= ~PCIB_HOTPLUG_CMD_PENDING;
} else {
device_printf(dev,
"Missed HotPlug interrupt waiting for Command Completion\n");
pcib_pcie_intr_hotplug(sc);
}
}
static void
pcib_pcie_dll_timeout(void *arg)
{
struct pcib_softc *sc;
device_t dev;
uint16_t sta;
sc = arg;
dev = sc->dev;
PCIB_HP_LOCK_ASSERT(sc);
sta = pcie_read_config(dev, PCIER_LINK_STA, 2);
if (!(sta & PCIEM_LINK_STA_DL_ACTIVE)) {
device_printf(dev,
"Timed out waiting for Data Link Layer Active\n");
sc->flags |= PCIB_DETACHING;
pcib_pcie_hotplug_update(sc, 0, 0, true);
} else if (sta != sc->pcie_link_sta) {
device_printf(dev,
"Missed HotPlug interrupt waiting for DLL Active\n");
pcib_pcie_intr_hotplug(sc);
}
}
static int
pcib_alloc_pcie_irq(struct pcib_softc *sc)
{
device_t dev;
int count, error, rid;
rid = -1;
dev = sc->dev;
/*
* For simplicity, only use MSI-X if there is a single message.
* To support a device with multiple messages we would have to
* use remap intr if the MSI number is not 0.
*/
count = pci_msix_count(dev);
if (count == 1) {
error = pci_alloc_msix(dev, &count);
if (error == 0)
rid = 1;
}
if (rid < 0 && pci_msi_count(dev) > 0) {
count = 1;
error = pci_alloc_msi(dev, &count);
if (error == 0)
rid = 1;
}
if (rid < 0)
rid = 0;
sc->pcie_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE | RF_SHAREABLE);
if (sc->pcie_irq == NULL) {
device_printf(dev,
"Failed to allocate interrupt for PCI-e events\n");
if (rid > 0)
pci_release_msi(dev);
return (ENXIO);
}
error = bus_setup_intr(dev, sc->pcie_irq, INTR_TYPE_MISC|INTR_MPSAFE,
NULL, pcib_pcie_intr_hotplug, sc, &sc->pcie_ihand);
if (error) {
device_printf(dev, "Failed to setup PCI-e interrupt handler\n");
bus_release_resource(dev, SYS_RES_IRQ, rid, sc->pcie_irq);
if (rid > 0)
pci_release_msi(dev);
return (error);
}
return (0);
}
static int
pcib_release_pcie_irq(struct pcib_softc *sc)
{
device_t dev;
int error;
dev = sc->dev;
error = bus_teardown_intr(dev, sc->pcie_irq, sc->pcie_ihand);
if (error)
return (error);
error = bus_free_resource(dev, SYS_RES_IRQ, sc->pcie_irq);
if (error)
return (error);
return (pci_release_msi(dev));
}
static void
pcib_setup_hotplug(struct pcib_softc *sc)
{
device_t dev;
uint16_t mask, val;
dev = sc->dev;
callout_init(&sc->pcie_ab_timer, 0);
callout_init(&sc->pcie_cc_timer, 0);
callout_init(&sc->pcie_dll_timer, 0);
TASK_INIT(&sc->pcie_hp_task, 0, pcib_pcie_hotplug_task, sc);
sc->pcie_hp_lock = &Giant;
/* Allocate IRQ. */
if (pcib_alloc_pcie_irq(sc) != 0)
return;
sc->pcie_link_sta = pcie_read_config(dev, PCIER_LINK_STA, 2);
sc->pcie_slot_sta = pcie_read_config(dev, PCIER_SLOT_STA, 2);
/* Clear any events previously pending. */
pcie_write_config(dev, PCIER_SLOT_STA, sc->pcie_slot_sta, 2);
/* Enable HotPlug events. */
mask = PCIEM_SLOT_CTL_DLLSCE | PCIEM_SLOT_CTL_HPIE |
PCIEM_SLOT_CTL_CCIE | PCIEM_SLOT_CTL_PDCE | PCIEM_SLOT_CTL_MRLSCE |
PCIEM_SLOT_CTL_PFDE | PCIEM_SLOT_CTL_ABPE;
val = PCIEM_SLOT_CTL_DLLSCE | PCIEM_SLOT_CTL_HPIE | PCIEM_SLOT_CTL_PDCE;
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_APB)
val |= PCIEM_SLOT_CTL_ABPE;
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_PCP)
val |= PCIEM_SLOT_CTL_PFDE;
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_MRLSP)
val |= PCIEM_SLOT_CTL_MRLSCE;
if (!(sc->pcie_slot_cap & PCIEM_SLOT_CAP_NCCS))
val |= PCIEM_SLOT_CTL_CCIE;
/* Turn the attention indicator off. */
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_AIP) {
mask |= PCIEM_SLOT_CTL_AIC;
val |= PCIEM_SLOT_CTL_AI_OFF;
}
pcib_pcie_hotplug_update(sc, val, mask, false);
}
static int
pcib_detach_hotplug(struct pcib_softc *sc)
{
uint16_t mask, val;
int error;
/* Disable the card in the slot and force it to detach. */
if (sc->flags & PCIB_DETACH_PENDING) {
sc->flags &= ~PCIB_DETACH_PENDING;
callout_stop(&sc->pcie_ab_timer);
}
sc->flags |= PCIB_DETACHING;
if (sc->flags & PCIB_HOTPLUG_CMD_PENDING) {
callout_stop(&sc->pcie_cc_timer);
tsleep(sc, 0, "hpcmd", hz);
sc->flags &= ~PCIB_HOTPLUG_CMD_PENDING;
}
/* Disable HotPlug events. */
mask = PCIEM_SLOT_CTL_DLLSCE | PCIEM_SLOT_CTL_HPIE |
PCIEM_SLOT_CTL_CCIE | PCIEM_SLOT_CTL_PDCE | PCIEM_SLOT_CTL_MRLSCE |
PCIEM_SLOT_CTL_PFDE | PCIEM_SLOT_CTL_ABPE;
val = 0;
/* Turn the attention indicator off. */
if (sc->pcie_slot_cap & PCIEM_SLOT_CAP_AIP) {
mask |= PCIEM_SLOT_CTL_AIC;
val |= PCIEM_SLOT_CTL_AI_OFF;
}
pcib_pcie_hotplug_update(sc, val, mask, false);
error = pcib_release_pcie_irq(sc);
if (error)
return (error);
taskqueue_drain(taskqueue_pci_hp, &sc->pcie_hp_task);
callout_drain(&sc->pcie_ab_timer);
callout_drain(&sc->pcie_cc_timer);
callout_drain(&sc->pcie_dll_timer);
return (0);
}
#endif
/*
* Get current bridge configuration.
*/
static void
pcib_cfg_save(struct pcib_softc *sc)
{
#ifndef NEW_PCIB
device_t dev;
uint16_t command;
dev = sc->dev;
command = pci_read_config(dev, PCIR_COMMAND, 2);
if (command & PCIM_CMD_PORTEN)
pcib_get_io_decode(sc);
if (command & PCIM_CMD_MEMEN)
pcib_get_mem_decode(sc);
#endif
}
/*
* Restore previous bridge configuration.
*/
static void
pcib_cfg_restore(struct pcib_softc *sc)
{
#ifndef NEW_PCIB
uint16_t command;
#endif
#ifdef NEW_PCIB
pcib_write_windows(sc, WIN_IO | WIN_MEM | WIN_PMEM);
#else
command = pci_read_config(sc->dev, PCIR_COMMAND, 2);
if (command & PCIM_CMD_PORTEN)
pcib_set_io_decode(sc);
if (command & PCIM_CMD_MEMEN)
pcib_set_mem_decode(sc);
#endif
}
/*
* Generic device interface
*/
static int
pcib_probe(device_t dev)
{
if ((pci_get_class(dev) == PCIC_BRIDGE) &&
(pci_get_subclass(dev) == PCIS_BRIDGE_PCI)) {
device_set_desc(dev, "PCI-PCI bridge");
return(-10000);
}
return(ENXIO);
}
void
pcib_attach_common(device_t dev)
{
struct pcib_softc *sc;
struct sysctl_ctx_list *sctx;
struct sysctl_oid *soid;
int comma;
sc = device_get_softc(dev);
sc->dev = dev;
/*
* Get current bridge configuration.
*/
sc->domain = pci_get_domain(dev);
#if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
sc->bus.sec = pci_read_config(dev, PCIR_SECBUS_1, 1);
sc->bus.sub = pci_read_config(dev, PCIR_SUBBUS_1, 1);
#endif
sc->bridgectl = pci_read_config(dev, PCIR_BRIDGECTL_1, 2);
pcib_cfg_save(sc);
/*
* The primary bus register should always be the bus of the
* parent.
*/
sc->pribus = pci_get_bus(dev);
pci_write_config(dev, PCIR_PRIBUS_1, sc->pribus, 1);
/*
* Setup sysctl reporting nodes
*/
sctx = device_get_sysctl_ctx(dev);
soid = device_get_sysctl_tree(dev);
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "domain",
CTLFLAG_RD, &sc->domain, 0, "Domain number");
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "pribus",
CTLFLAG_RD, &sc->pribus, 0, "Primary bus number");
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "secbus",
CTLFLAG_RD, &sc->bus.sec, 0, "Secondary bus number");
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "subbus",
CTLFLAG_RD, &sc->bus.sub, 0, "Subordinate bus number");
/*
* Quirk handling.
*/
switch (pci_get_devid(dev)) {
#if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
case 0x12258086: /* Intel 82454KX/GX (Orion) */
{
uint8_t supbus;
supbus = pci_read_config(dev, 0x41, 1);
if (supbus != 0xff) {
sc->bus.sec = supbus + 1;
sc->bus.sub = supbus + 1;
}
break;
}
#endif
/*
* The i82380FB mobile docking controller is a PCI-PCI bridge,
* and it is a subtractive bridge. However, the ProgIf is wrong
* so the normal setting of PCIB_SUBTRACTIVE bit doesn't
* happen. There are also Toshiba and Cavium ThunderX bridges
* that behave this way.
*/
case 0xa002177d: /* Cavium ThunderX */
case 0x124b8086: /* Intel 82380FB Mobile */
case 0x060513d7: /* Toshiba ???? */
sc->flags |= PCIB_SUBTRACTIVE;
break;
#if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
/* Compaq R3000 BIOS sets wrong subordinate bus number. */
case 0x00dd10de:
{
char *cp;
if ((cp = kern_getenv("smbios.planar.maker")) == NULL)
break;
if (strncmp(cp, "Compal", 6) != 0) {
freeenv(cp);
break;
}
freeenv(cp);
if ((cp = kern_getenv("smbios.planar.product")) == NULL)
break;
if (strncmp(cp, "08A0", 4) != 0) {
freeenv(cp);
break;
}
freeenv(cp);
if (sc->bus.sub < 0xa) {
pci_write_config(dev, PCIR_SUBBUS_1, 0xa, 1);
sc->bus.sub = pci_read_config(dev, PCIR_SUBBUS_1, 1);
}
break;
}
#endif
}
if (pci_msi_device_blacklisted(dev))
sc->flags |= PCIB_DISABLE_MSI;
if (pci_msix_device_blacklisted(dev))
sc->flags |= PCIB_DISABLE_MSIX;
/*
* Intel 815, 845 and other chipsets say they are PCI-PCI bridges,
* but have a ProgIF of 0x80. The 82801 family (AA, AB, BAM/CAM,
* BA/CA/DB and E) PCI bridges are HUB-PCI bridges, in Intelese.
* This means they act as if they were subtractively decoding
* bridges and pass all transactions. Mark them and real ProgIf 1
* parts as subtractive.
*/
if ((pci_get_devid(dev) & 0xff00ffff) == 0x24008086 ||
pci_read_config(dev, PCIR_PROGIF, 1) == PCIP_BRIDGE_PCI_SUBTRACTIVE)
sc->flags |= PCIB_SUBTRACTIVE;
#ifdef PCI_HP
pcib_probe_hotplug(sc);
#endif
#ifdef NEW_PCIB
#ifdef PCI_RES_BUS
pcib_setup_secbus(dev, &sc->bus, 1);
#endif
pcib_probe_windows(sc);
#endif
#ifdef PCI_HP
if (sc->flags & PCIB_HOTPLUG)
pcib_setup_hotplug(sc);
#endif
if (bootverbose) {
device_printf(dev, " domain %d\n", sc->domain);
device_printf(dev, " secondary bus %d\n", sc->bus.sec);
device_printf(dev, " subordinate bus %d\n", sc->bus.sub);
#ifdef NEW_PCIB
if (pcib_is_window_open(&sc->io))
device_printf(dev, " I/O decode 0x%jx-0x%jx\n",
(uintmax_t)sc->io.base, (uintmax_t)sc->io.limit);
if (pcib_is_window_open(&sc->mem))
device_printf(dev, " memory decode 0x%jx-0x%jx\n",
(uintmax_t)sc->mem.base, (uintmax_t)sc->mem.limit);
if (pcib_is_window_open(&sc->pmem))
device_printf(dev, " prefetched decode 0x%jx-0x%jx\n",
(uintmax_t)sc->pmem.base, (uintmax_t)sc->pmem.limit);
#else
if (pcib_is_io_open(sc))
device_printf(dev, " I/O decode 0x%x-0x%x\n",
sc->iobase, sc->iolimit);
if (pcib_is_nonprefetch_open(sc))
device_printf(dev, " memory decode 0x%jx-0x%jx\n",
(uintmax_t)sc->membase, (uintmax_t)sc->memlimit);
if (pcib_is_prefetch_open(sc))
device_printf(dev, " prefetched decode 0x%jx-0x%jx\n",
(uintmax_t)sc->pmembase, (uintmax_t)sc->pmemlimit);
#endif
if (sc->bridgectl & (PCIB_BCR_ISA_ENABLE | PCIB_BCR_VGA_ENABLE) ||
sc->flags & PCIB_SUBTRACTIVE) {
device_printf(dev, " special decode ");
comma = 0;
if (sc->bridgectl & PCIB_BCR_ISA_ENABLE) {
printf("ISA");
comma = 1;
}
if (sc->bridgectl & PCIB_BCR_VGA_ENABLE) {
printf("%sVGA", comma ? ", " : "");
comma = 1;
}
if (sc->flags & PCIB_SUBTRACTIVE)
printf("%ssubtractive", comma ? ", " : "");
printf("\n");
}
}
/*
* Always enable busmastering on bridges so that transactions
* initiated on the secondary bus are passed through to the
* primary bus.
*/
pci_enable_busmaster(dev);
}
#ifdef PCI_HP
static int
pcib_present(struct pcib_softc *sc)
{
if (sc->flags & PCIB_HOTPLUG)
return (pcib_hotplug_present(sc) != 0);
return (1);
}
#endif
int
pcib_attach_child(device_t dev)
{
struct pcib_softc *sc;
sc = device_get_softc(dev);
if (sc->bus.sec == 0) {
/* no secondary bus; we should have fixed this */
return(0);
}
#ifdef PCI_HP
if (!pcib_present(sc)) {
/* An empty HotPlug slot, so don't add a PCI bus yet. */
return (0);
}
#endif
sc->child = device_add_child(dev, "pci", -1);
return (bus_generic_attach(dev));
}
int
pcib_attach(device_t dev)
{
pcib_attach_common(dev);
return (pcib_attach_child(dev));
}
int
pcib_detach(device_t dev)
{
#if defined(PCI_HP) || defined(NEW_PCIB)
struct pcib_softc *sc;
#endif
int error;
#if defined(PCI_HP) || defined(NEW_PCIB)
sc = device_get_softc(dev);
#endif
error = bus_generic_detach(dev);
if (error)
return (error);
#ifdef PCI_HP
if (sc->flags & PCIB_HOTPLUG) {
error = pcib_detach_hotplug(sc);
if (error)
return (error);
}
#endif
error = device_delete_children(dev);
if (error)
return (error);
#ifdef NEW_PCIB
pcib_free_windows(sc);
#ifdef PCI_RES_BUS
pcib_free_secbus(dev, &sc->bus);
#endif
#endif
return (0);
}
int
pcib_suspend(device_t dev)
{
pcib_cfg_save(device_get_softc(dev));
return (bus_generic_suspend(dev));
}
int
pcib_resume(device_t dev)
{
pcib_cfg_restore(device_get_softc(dev));
/*
* Restore the Command register only after restoring the windows.
* The bridge should not be claiming random windows.
*/
pci_write_config(dev, PCIR_COMMAND, pci_get_cmdreg(dev), 2);
return (bus_generic_resume(dev));
}
void
pcib_bridge_init(device_t dev)
{
pci_write_config(dev, PCIR_IOBASEL_1, 0xff, 1);
pci_write_config(dev, PCIR_IOBASEH_1, 0xffff, 2);
pci_write_config(dev, PCIR_IOLIMITL_1, 0, 1);
pci_write_config(dev, PCIR_IOLIMITH_1, 0, 2);
pci_write_config(dev, PCIR_MEMBASE_1, 0xffff, 2);
pci_write_config(dev, PCIR_MEMLIMIT_1, 0, 2);
pci_write_config(dev, PCIR_PMBASEL_1, 0xffff, 2);
pci_write_config(dev, PCIR_PMBASEH_1, 0xffffffff, 4);
pci_write_config(dev, PCIR_PMLIMITL_1, 0, 2);
pci_write_config(dev, PCIR_PMLIMITH_1, 0, 4);
}
int
pcib_child_present(device_t dev, device_t child)
{
#ifdef PCI_HP
struct pcib_softc *sc = device_get_softc(dev);
int retval;
retval = bus_child_present(dev);
if (retval != 0 && sc->flags & PCIB_HOTPLUG)
retval = pcib_hotplug_present(sc);
return (retval);
#else
return (bus_child_present(dev));
#endif
}
int
pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct pcib_softc *sc = device_get_softc(dev);
switch (which) {
case PCIB_IVAR_DOMAIN:
*result = sc->domain;
return(0);
case PCIB_IVAR_BUS:
*result = sc->bus.sec;
return(0);
}
return(ENOENT);
}
int
pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
{
switch (which) {
case PCIB_IVAR_DOMAIN:
return(EINVAL);
case PCIB_IVAR_BUS:
return(EINVAL);
}
return(ENOENT);
}
#ifdef NEW_PCIB
/*
* Attempt to allocate a resource from the existing resources assigned
* to a window.
*/
static struct resource *
pcib_suballoc_resource(struct pcib_softc *sc, struct pcib_window *w,
device_t child, int type, int *rid, rman_res_t start, rman_res_t end,
rman_res_t count, u_int flags)
{
struct resource *res;
if (!pcib_is_window_open(w))
return (NULL);
res = rman_reserve_resource(&w->rman, start, end, count,
flags & ~RF_ACTIVE, child);
if (res == NULL)
return (NULL);
if (bootverbose)
device_printf(sc->dev,
"allocated %s range (%#jx-%#jx) for rid %x of %s\n",
w->name, rman_get_start(res), rman_get_end(res), *rid,
pcib_child_name(child));
rman_set_rid(res, *rid);
/*
* If the resource should be active, pass that request up the
* tree. This assumes the parent drivers can handle
* activating sub-allocated resources.
*/
if (flags & RF_ACTIVE) {
if (bus_activate_resource(child, type, *rid, res) != 0) {
rman_release_resource(res);
return (NULL);
}
}
return (res);
}
/* Allocate a fresh resource range for an unconfigured window. */
static int
pcib_alloc_new_window(struct pcib_softc *sc, struct pcib_window *w, int type,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct resource *res;
rman_res_t base, limit, wmask;
int rid;
/*
* If this is an I/O window on a bridge with ISA enable set
* and the start address is below 64k, then try to allocate an
* initial window of 0x1000 bytes long starting at address
* 0xf000 and walking down. Note that if the original request
* was larger than the non-aliased range size of 0x100 our
* caller would have raised the start address up to 64k
* already.
*/
if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
start < 65536) {
for (base = 0xf000; (long)base >= 0; base -= 0x1000) {
limit = base + 0xfff;
/*
* Skip ranges that wouldn't work for the
* original request. Note that the actual
* window that overlaps are the non-alias
* ranges within [base, limit], so this isn't
* quite a simple comparison.
*/
if (start + count > limit - 0x400)
continue;
if (base == 0) {
/*
* The first open region for the window at
* 0 is 0x400-0x4ff.
*/
if (end - count + 1 < 0x400)
continue;
} else {
if (end - count + 1 < base)
continue;
}
if (pcib_alloc_nonisa_ranges(sc, base, limit) == 0) {
w->base = base;
w->limit = limit;
return (0);
}
}
return (ENOSPC);
}
wmask = ((rman_res_t)1 << w->step) - 1;
if (RF_ALIGNMENT(flags) < w->step) {
flags &= ~RF_ALIGNMENT_MASK;
flags |= RF_ALIGNMENT_LOG2(w->step);
}
start &= ~wmask;
end |= wmask;
count = roundup2(count, (rman_res_t)1 << w->step);
rid = w->reg;
res = bus_alloc_resource(sc->dev, type, &rid, start, end, count,
flags & ~RF_ACTIVE);
if (res == NULL)
return (ENOSPC);
pcib_add_window_resources(w, &res, 1);
pcib_activate_window(sc, type);
w->base = rman_get_start(res);
w->limit = rman_get_end(res);
return (0);
}
/* Try to expand an existing window to the requested base and limit. */
static int
pcib_expand_window(struct pcib_softc *sc, struct pcib_window *w, int type,
rman_res_t base, rman_res_t limit)
{
struct resource *res;
int error, i, force_64k_base;
KASSERT(base <= w->base && limit >= w->limit,
("attempting to shrink window"));
/*
* XXX: pcib_grow_window() doesn't try to do this anyway and
* the error handling for all the edge cases would be tedious.
*/
KASSERT(limit == w->limit || base == w->base,
("attempting to grow both ends of a window"));
/*
* Yet more special handling for requests to expand an I/O
* window behind an ISA-enabled bridge. Since I/O windows
* have to grow in 0x1000 increments and the end of the 0xffff
* range is an alias, growing a window below 64k will always
* result in allocating new resources and never adjusting an
* existing resource.
*/
if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
(limit <= 65535 || (base <= 65535 && base != w->base))) {
KASSERT(limit == w->limit || limit <= 65535,
("attempting to grow both ends across 64k ISA alias"));
if (base != w->base)
error = pcib_alloc_nonisa_ranges(sc, base, w->base - 1);
else
error = pcib_alloc_nonisa_ranges(sc, w->limit + 1,
limit);
if (error == 0) {
w->base = base;
w->limit = limit;
}
return (error);
}
/*
* Find the existing resource to adjust. Usually there is only one,
* but for an ISA-enabled bridge we might be growing the I/O window
* above 64k and need to find the existing resource that maps all
* of the area above 64k.
*/
for (i = 0; i < w->count; i++) {
if (rman_get_end(w->res[i]) == w->limit)
break;
}
KASSERT(i != w->count, ("did not find existing resource"));
res = w->res[i];
/*
* Usually the resource we found should match the window's
* existing range. The one exception is the ISA-enabled case
* mentioned above in which case the resource should start at
* 64k.
*/
if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
w->base <= 65535) {
KASSERT(rman_get_start(res) == 65536,
("existing resource mismatch"));
force_64k_base = 1;
} else {
KASSERT(w->base == rman_get_start(res),
("existing resource mismatch"));
force_64k_base = 0;
}
error = bus_adjust_resource(sc->dev, type, res, force_64k_base ?
rman_get_start(res) : base, limit);
if (error)
return (error);
/* Add the newly allocated region to the resource manager. */
if (w->base != base) {
error = rman_manage_region(&w->rman, base, w->base - 1);
w->base = base;
} else {
error = rman_manage_region(&w->rman, w->limit + 1, limit);
w->limit = limit;
}
if (error) {
if (bootverbose)
device_printf(sc->dev,
"failed to expand %s resource manager\n", w->name);
(void)bus_adjust_resource(sc->dev, type, res, force_64k_base ?
rman_get_start(res) : w->base, w->limit);
}
return (error);
}
/*
* Attempt to grow a window to make room for a given resource request.
*/
static int
pcib_grow_window(struct pcib_softc *sc, struct pcib_window *w, int type,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
rman_res_t align, start_free, end_free, front, back, wmask;
int error;
/*
* Clamp the desired resource range to the maximum address
* this window supports. Reject impossible requests.
*
* For I/O port requests behind a bridge with the ISA enable
* bit set, force large allocations to start above 64k.
*/
if (!w->valid)
return (EINVAL);
if (sc->bridgectl & PCIB_BCR_ISA_ENABLE && count > 0x100 &&
start < 65536)
start = 65536;
if (end > w->rman.rm_end)
end = w->rman.rm_end;
if (start + count - 1 > end || start + count < start)
return (EINVAL);
wmask = ((rman_res_t)1 << w->step) - 1;
/*
* If there is no resource at all, just try to allocate enough
* aligned space for this resource.
*/
if (w->res == NULL) {
error = pcib_alloc_new_window(sc, w, type, start, end, count,
flags);
if (error) {
if (bootverbose)
device_printf(sc->dev,
"failed to allocate initial %s window (%#jx-%#jx,%#jx)\n",
w->name, start, end, count);
return (error);
}
if (bootverbose)
device_printf(sc->dev,
"allocated initial %s window of %#jx-%#jx\n",
w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
goto updatewin;
}
/*
* See if growing the window would help. Compute the minimum
* amount of address space needed on both the front and back
* ends of the existing window to satisfy the allocation.
*
* For each end, build a candidate region adjusting for the
* required alignment, etc. If there is a free region at the
* edge of the window, grow from the inner edge of the free
* region. Otherwise grow from the window boundary.
*
* Growing an I/O window below 64k for a bridge with the ISA
* enable bit doesn't require any special magic as the step
* size of an I/O window (1k) always includes multiple
* non-alias ranges when it is grown in either direction.
*
* XXX: Special case: if w->res is completely empty and the
* request size is larger than w->res, we should find the
* optimal aligned buffer containing w->res and allocate that.
*/
if (bootverbose)
device_printf(sc->dev,
"attempting to grow %s window for (%#jx-%#jx,%#jx)\n",
w->name, start, end, count);
align = (rman_res_t)1 << RF_ALIGNMENT(flags);
if (start < w->base) {
if (rman_first_free_region(&w->rman, &start_free, &end_free) !=
0 || start_free != w->base)
end_free = w->base;
if (end_free > end)
end_free = end + 1;
/* Move end_free down until it is properly aligned. */
end_free &= ~(align - 1);
end_free--;
front = end_free - (count - 1);
/*
* The resource would now be allocated at (front,
* end_free). Ensure that fits in the (start, end)
* bounds. end_free is checked above. If 'front' is
* ok, ensure it is properly aligned for this window.
* Also check for underflow.
*/
if (front >= start && front <= end_free) {
if (bootverbose)
printf("\tfront candidate range: %#jx-%#jx\n",
front, end_free);
front &= ~wmask;
front = w->base - front;
} else
front = 0;
} else
front = 0;
if (end > w->limit) {
if (rman_last_free_region(&w->rman, &start_free, &end_free) !=
0 || end_free != w->limit)
start_free = w->limit + 1;
if (start_free < start)
start_free = start;
/* Move start_free up until it is properly aligned. */
start_free = roundup2(start_free, align);
back = start_free + count - 1;
/*
* The resource would now be allocated at (start_free,
* back). Ensure that fits in the (start, end)
* bounds. start_free is checked above. If 'back' is
* ok, ensure it is properly aligned for this window.
* Also check for overflow.
*/
if (back <= end && start_free <= back) {
if (bootverbose)
printf("\tback candidate range: %#jx-%#jx\n",
start_free, back);
back |= wmask;
back -= w->limit;
} else
back = 0;
} else
back = 0;
/*
* Try to allocate the smallest needed region first.
* If that fails, fall back to the other region.
*/
error = ENOSPC;
while (front != 0 || back != 0) {
if (front != 0 && (front <= back || back == 0)) {
error = pcib_expand_window(sc, w, type, w->base - front,
w->limit);
if (error == 0)
break;
front = 0;
} else {
error = pcib_expand_window(sc, w, type, w->base,
w->limit + back);
if (error == 0)
break;
back = 0;
}
}
if (error)
return (error);
if (bootverbose)
device_printf(sc->dev, "grew %s window to %#jx-%#jx\n",
w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
updatewin:
/* Write the new window. */
KASSERT((w->base & wmask) == 0, ("start address is not aligned"));
KASSERT((w->limit & wmask) == wmask, ("end address is not aligned"));
pcib_write_windows(sc, w->mask);
return (0);
}
/*
* We have to trap resource allocation requests and ensure that the bridge
* is set up to, or capable of handling them.
*/
struct resource *
pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct pcib_softc *sc;
struct resource *r;
sc = device_get_softc(dev);
/*
* VGA resources are decoded iff the VGA enable bit is set in
* the bridge control register. VGA resources do not fall into
* the resource windows and are passed up to the parent.
*/
if ((type == SYS_RES_IOPORT && pci_is_vga_ioport_range(start, end)) ||
(type == SYS_RES_MEMORY && pci_is_vga_memory_range(start, end))) {
if (sc->bridgectl & PCIB_BCR_VGA_ENABLE)
return (bus_generic_alloc_resource(dev, child, type,
rid, start, end, count, flags));
else
return (NULL);
}
switch (type) {
#ifdef PCI_RES_BUS
case PCI_RES_BUS:
return (pcib_alloc_subbus(&sc->bus, child, rid, start, end,
count, flags));
#endif
case SYS_RES_IOPORT:
if (pcib_is_isa_range(sc, start, end, count))
return (NULL);
r = pcib_suballoc_resource(sc, &sc->io, child, type, rid, start,
end, count, flags);
if (r != NULL || (sc->flags & PCIB_SUBTRACTIVE) != 0)
break;
if (pcib_grow_window(sc, &sc->io, type, start, end, count,
flags) == 0)
r = pcib_suballoc_resource(sc, &sc->io, child, type,
rid, start, end, count, flags);
break;
case SYS_RES_MEMORY:
/*
* For prefetchable resources, prefer the prefetchable
* memory window, but fall back to the regular memory
* window if that fails. Try both windows before
* attempting to grow a window in case the firmware
* has used a range in the regular memory window to
* map a prefetchable BAR.
*/
if (flags & RF_PREFETCHABLE) {
r = pcib_suballoc_resource(sc, &sc->pmem, child, type,
rid, start, end, count, flags);
if (r != NULL)
break;
}
r = pcib_suballoc_resource(sc, &sc->mem, child, type, rid,
start, end, count, flags);
if (r != NULL || (sc->flags & PCIB_SUBTRACTIVE) != 0)
break;
if (flags & RF_PREFETCHABLE) {
if (pcib_grow_window(sc, &sc->pmem, type, start, end,
count, flags) == 0) {
r = pcib_suballoc_resource(sc, &sc->pmem, child,
type, rid, start, end, count, flags);
if (r != NULL)
break;
}
}
if (pcib_grow_window(sc, &sc->mem, type, start, end, count,
flags & ~RF_PREFETCHABLE) == 0)
r = pcib_suballoc_resource(sc, &sc->mem, child, type,
rid, start, end, count, flags);
break;
default:
return (bus_generic_alloc_resource(dev, child, type, rid,
start, end, count, flags));
}
/*
* If attempts to suballocate from the window fail but this is a
* subtractive bridge, pass the request up the tree.
*/
if (sc->flags & PCIB_SUBTRACTIVE && r == NULL)
return (bus_generic_alloc_resource(dev, child, type, rid,
start, end, count, flags));
return (r);
}
int
pcib_adjust_resource(device_t bus, device_t child, int type, struct resource *r,
rman_res_t start, rman_res_t end)
{
struct pcib_softc *sc;
sc = device_get_softc(bus);
if (pcib_is_resource_managed(sc, type, r))
return (rman_adjust_resource(r, start, end));
return (bus_generic_adjust_resource(bus, child, type, r, start, end));
}
int
pcib_release_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
struct pcib_softc *sc;
int error;
sc = device_get_softc(dev);
if (pcib_is_resource_managed(sc, type, r)) {
if (rman_get_flags(r) & RF_ACTIVE) {
error = bus_deactivate_resource(child, type, rid, r);
if (error)
return (error);
}
return (rman_release_resource(r));
}
return (bus_generic_release_resource(dev, child, type, rid, r));
}
#else
/*
* We have to trap resource allocation requests and ensure that the bridge
* is set up to, or capable of handling them.
*/
struct resource *
pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct pcib_softc *sc = device_get_softc(dev);
const char *name, *suffix;
int ok;
/*
* Fail the allocation for this range if it's not supported.
*/
name = device_get_nameunit(child);
if (name == NULL) {
name = "";
suffix = "";
} else
suffix = " ";
switch (type) {
case SYS_RES_IOPORT:
ok = 0;
if (!pcib_is_io_open(sc))
break;
ok = (start >= sc->iobase && end <= sc->iolimit);
/*
* Make sure we allow access to VGA I/O addresses when the
* bridge has the "VGA Enable" bit set.
*/
if (!ok && pci_is_vga_ioport_range(start, end))
ok = (sc->bridgectl & PCIB_BCR_VGA_ENABLE) ? 1 : 0;
if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
if (!ok) {
if (start < sc->iobase)
start = sc->iobase;
if (end > sc->iolimit)
end = sc->iolimit;
if (start < end)
ok = 1;
}
} else {
ok = 1;
#if 0
/*
* If we overlap with the subtractive range, then
* pick the upper range to use.
*/
if (start < sc->iolimit && end > sc->iobase)
start = sc->iolimit + 1;
#endif
}
if (end < start) {
device_printf(dev, "ioport: end (%jx) < start (%jx)\n",
end, start);
start = 0;
end = 0;
ok = 0;
}
if (!ok) {
device_printf(dev, "%s%srequested unsupported I/O "
"range 0x%jx-0x%jx (decoding 0x%x-0x%x)\n",
name, suffix, start, end, sc->iobase, sc->iolimit);
return (NULL);
}
if (bootverbose)
device_printf(dev,
"%s%srequested I/O range 0x%jx-0x%jx: in range\n",
name, suffix, start, end);
break;
case SYS_RES_MEMORY:
ok = 0;
if (pcib_is_nonprefetch_open(sc))
ok = ok || (start >= sc->membase && end <= sc->memlimit);
if (pcib_is_prefetch_open(sc))
ok = ok || (start >= sc->pmembase && end <= sc->pmemlimit);
/*
* Make sure we allow access to VGA memory addresses when the
* bridge has the "VGA Enable" bit set.
*/
if (!ok && pci_is_vga_memory_range(start, end))
ok = (sc->bridgectl & PCIB_BCR_VGA_ENABLE) ? 1 : 0;
if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
if (!ok) {
ok = 1;
if (flags & RF_PREFETCHABLE) {
if (pcib_is_prefetch_open(sc)) {
if (start < sc->pmembase)
start = sc->pmembase;
if (end > sc->pmemlimit)
end = sc->pmemlimit;
} else {
ok = 0;
}
} else { /* non-prefetchable */
if (pcib_is_nonprefetch_open(sc)) {
if (start < sc->membase)
start = sc->membase;
if (end > sc->memlimit)
end = sc->memlimit;
} else {
ok = 0;
}
}
}
} else if (!ok) {
ok = 1; /* subtractive bridge: always ok */
#if 0
if (pcib_is_nonprefetch_open(sc)) {
if (start < sc->memlimit && end > sc->membase)
start = sc->memlimit + 1;
}
if (pcib_is_prefetch_open(sc)) {
if (start < sc->pmemlimit && end > sc->pmembase)
start = sc->pmemlimit + 1;
}
#endif
}
if (end < start) {
device_printf(dev, "memory: end (%jx) < start (%jx)\n",
end, start);
start = 0;
end = 0;
ok = 0;
}
if (!ok && bootverbose)
device_printf(dev,
"%s%srequested unsupported memory range %#jx-%#jx "
"(decoding %#jx-%#jx, %#jx-%#jx)\n",
name, suffix, start, end,
(uintmax_t)sc->membase, (uintmax_t)sc->memlimit,
(uintmax_t)sc->pmembase, (uintmax_t)sc->pmemlimit);
if (!ok)
return (NULL);
if (bootverbose)
device_printf(dev,"%s%srequested memory range "
"0x%jx-0x%jx: good\n",
name, suffix, start, end);
break;
default:
break;
}
/*
* Bridge is OK decoding this resource, so pass it up.
*/
return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
count, flags));
}
#endif
/*
* If ARI is enabled on this downstream port, translate the function number
* to the non-ARI slot/function. The downstream port will convert it back in
* hardware. If ARI is not enabled slot and func are not modified.
*/
static __inline void
pcib_xlate_ari(device_t pcib, int bus, int *slot, int *func)
{
struct pcib_softc *sc;
int ari_func;
sc = device_get_softc(pcib);
ari_func = *func;
if (sc->flags & PCIB_ENABLE_ARI) {
KASSERT(*slot == 0,
("Non-zero slot number with ARI enabled!"));
*slot = PCIE_ARI_SLOT(ari_func);
*func = PCIE_ARI_FUNC(ari_func);
}
}
static void
pcib_enable_ari(struct pcib_softc *sc, uint32_t pcie_pos)
{
uint32_t ctl2;
ctl2 = pci_read_config(sc->dev, pcie_pos + PCIER_DEVICE_CTL2, 4);
ctl2 |= PCIEM_CTL2_ARI;
pci_write_config(sc->dev, pcie_pos + PCIER_DEVICE_CTL2, ctl2, 4);
sc->flags |= PCIB_ENABLE_ARI;
}
/*
* PCIB interface.
*/
int
pcib_maxslots(device_t dev)
{
#if !defined(__amd64__) && !defined(__i386__)
uint32_t pcie_pos;
uint16_t val;
/*
* If this is a PCIe rootport or downstream switch port, there's only
* one slot permitted.
*/
if (pci_find_cap(dev, PCIY_EXPRESS, &pcie_pos) == 0) {
val = pci_read_config(dev, pcie_pos + PCIER_FLAGS, 2);
val &= PCIEM_FLAGS_TYPE;
if (val == PCIEM_TYPE_ROOT_PORT ||
val == PCIEM_TYPE_DOWNSTREAM_PORT)
return (0);
}
#endif
return (PCI_SLOTMAX);
}
static int
pcib_ari_maxslots(device_t dev)
{
struct pcib_softc *sc;
sc = device_get_softc(dev);
if (sc->flags & PCIB_ENABLE_ARI)
return (PCIE_ARI_SLOTMAX);
else
return (pcib_maxslots(dev));
}
static int
pcib_ari_maxfuncs(device_t dev)
{
struct pcib_softc *sc;
sc = device_get_softc(dev);
if (sc->flags & PCIB_ENABLE_ARI)
return (PCIE_ARI_FUNCMAX);
else
return (PCI_FUNCMAX);
}
static void
pcib_ari_decode_rid(device_t pcib, uint16_t rid, int *bus, int *slot,
int *func)
{
struct pcib_softc *sc;
sc = device_get_softc(pcib);
*bus = PCI_RID2BUS(rid);
if (sc->flags & PCIB_ENABLE_ARI) {
*slot = PCIE_ARI_RID2SLOT(rid);
*func = PCIE_ARI_RID2FUNC(rid);
} else {
*slot = PCI_RID2SLOT(rid);
*func = PCI_RID2FUNC(rid);
}
}
/*
* Since we are a child of a PCI bus, its parent must support the pcib interface.
*/
static uint32_t
pcib_read_config(device_t dev, u_int b, u_int s, u_int f, u_int reg, int width)
{
#ifdef PCI_HP
struct pcib_softc *sc;
sc = device_get_softc(dev);
if (!pcib_present(sc)) {
switch (width) {
case 2:
return (0xffff);
case 1:
return (0xff);
default:
return (0xffffffff);
}
}
#endif
pcib_xlate_ari(dev, b, &s, &f);
return(PCIB_READ_CONFIG(device_get_parent(device_get_parent(dev)), b, s,
f, reg, width));
}
static void
pcib_write_config(device_t dev, u_int b, u_int s, u_int f, u_int reg, uint32_t val, int width)
{
#ifdef PCI_HP
struct pcib_softc *sc;
sc = device_get_softc(dev);
if (!pcib_present(sc))
return;
#endif
pcib_xlate_ari(dev, b, &s, &f);
PCIB_WRITE_CONFIG(device_get_parent(device_get_parent(dev)), b, s, f,
reg, val, width);
}
/*
* Route an interrupt across a PCI bridge.
*/
int
pcib_route_interrupt(device_t pcib, device_t dev, int pin)
{
device_t bus;
int parent_intpin;
int intnum;
/*
*
* The PCI standard defines a swizzle of the child-side device/intpin to
* the parent-side intpin as follows.
*
* device = device on child bus
* child_intpin = intpin on child bus slot (0-3)
* parent_intpin = intpin on parent bus slot (0-3)
*
* parent_intpin = (device + child_intpin) % 4
*/
parent_intpin = (pci_get_slot(dev) + (pin - 1)) % 4;
/*
* Our parent is a PCI bus. Its parent must export the pcib interface
* which includes the ability to route interrupts.
*/
bus = device_get_parent(pcib);
intnum = PCIB_ROUTE_INTERRUPT(device_get_parent(bus), pcib, parent_intpin + 1);
if (PCI_INTERRUPT_VALID(intnum) && bootverbose) {
device_printf(pcib, "slot %d INT%c is routed to irq %d\n",
pci_get_slot(dev), 'A' + pin - 1, intnum);
}
return(intnum);
}
/* Pass request to alloc MSI/MSI-X messages up to the parent bridge. */
int
pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
{
struct pcib_softc *sc = device_get_softc(pcib);
device_t bus;
if (sc->flags & PCIB_DISABLE_MSI)
return (ENXIO);
bus = device_get_parent(pcib);
return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
irqs));
}
/* Pass request to release MSI/MSI-X messages up to the parent bridge. */
int
pcib_release_msi(device_t pcib, device_t dev, int count, int *irqs)
{
device_t bus;
bus = device_get_parent(pcib);
return (PCIB_RELEASE_MSI(device_get_parent(bus), dev, count, irqs));
}
/* Pass request to alloc an MSI-X message up to the parent bridge. */
int
pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
{
struct pcib_softc *sc = device_get_softc(pcib);
device_t bus;
if (sc->flags & PCIB_DISABLE_MSIX)
return (ENXIO);
bus = device_get_parent(pcib);
return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
}
/* Pass request to release an MSI-X message up to the parent bridge. */
int
pcib_release_msix(device_t pcib, device_t dev, int irq)
{
device_t bus;
bus = device_get_parent(pcib);
return (PCIB_RELEASE_MSIX(device_get_parent(bus), dev, irq));
}
/* Pass request to map MSI/MSI-X message up to parent bridge. */
int
pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
uint32_t *data)
{
device_t bus;
int error;
bus = device_get_parent(pcib);
error = PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data);
if (error)
return (error);
pci_ht_map_msi(pcib, *addr);
return (0);
}
/* Pass request for device power state up to parent bridge. */
int
pcib_power_for_sleep(device_t pcib, device_t dev, int *pstate)
{
device_t bus;
bus = device_get_parent(pcib);
return (PCIB_POWER_FOR_SLEEP(bus, dev, pstate));
}
static int
pcib_ari_enabled(device_t pcib)
{
struct pcib_softc *sc;
sc = device_get_softc(pcib);
return ((sc->flags & PCIB_ENABLE_ARI) != 0);
}
static int
pcib_ari_get_id(device_t pcib, device_t dev, enum pci_id_type type,
uintptr_t *id)
{
struct pcib_softc *sc;
device_t bus_dev;
uint8_t bus, slot, func;
if (type != PCI_ID_RID) {
bus_dev = device_get_parent(pcib);
return (PCIB_GET_ID(device_get_parent(bus_dev), dev, type, id));
}
sc = device_get_softc(pcib);
if (sc->flags & PCIB_ENABLE_ARI) {
bus = pci_get_bus(dev);
func = pci_get_function(dev);
*id = (PCI_ARI_RID(bus, func));
} else {
bus = pci_get_bus(dev);
slot = pci_get_slot(dev);
func = pci_get_function(dev);
*id = (PCI_RID(bus, slot, func));
}
return (0);
}
/*
* Check that the downstream port (pcib) and the endpoint device (dev) both
* support ARI. If so, enable it and return 0, otherwise return an error.
*/
static int
pcib_try_enable_ari(device_t pcib, device_t dev)
{
struct pcib_softc *sc;
int error;
uint32_t cap2;
int ari_cap_off;
uint32_t ari_ver;
uint32_t pcie_pos;
sc = device_get_softc(pcib);
/*
* ARI is controlled in a register in the PCIe capability structure.
* If the downstream port does not have the PCIe capability structure
* then it does not support ARI.
*/
error = pci_find_cap(pcib, PCIY_EXPRESS, &pcie_pos);
if (error != 0)
return (ENODEV);
/* Check that the PCIe port advertises ARI support. */
cap2 = pci_read_config(pcib, pcie_pos + PCIER_DEVICE_CAP2, 4);
if (!(cap2 & PCIEM_CAP2_ARI))
return (ENODEV);
/*
* Check that the endpoint device advertises ARI support via the ARI
* extended capability structure.
*/
error = pci_find_extcap(dev, PCIZ_ARI, &ari_cap_off);
if (error != 0)
return (ENODEV);
/*
* Finally, check that the endpoint device supports the same version
* of ARI that we do.
*/
ari_ver = pci_read_config(dev, ari_cap_off, 4);
if (PCI_EXTCAP_VER(ari_ver) != PCIB_SUPPORTED_ARI_VER) {
if (bootverbose)
device_printf(pcib,
"Unsupported version of ARI (%d) detected\n",
PCI_EXTCAP_VER(ari_ver));
return (ENXIO);
}
pcib_enable_ari(sc, pcie_pos);
return (0);
}
int
pcib_request_feature_allow(device_t pcib, device_t dev,
enum pci_feature feature)
{
/*
* No host firmware we have to negotiate with, so we allow
* every valid feature requested.
*/
switch (feature) {
case PCI_FEATURE_AER:
case PCI_FEATURE_HP:
break;
default:
return (EINVAL);
}
return (0);
}
int
pcib_request_feature(device_t dev, enum pci_feature feature)
{
/*
* Invoke PCIB_REQUEST_FEATURE of this bridge first in case
* the firmware overrides the method of PCI-PCI bridges.
*/
return (PCIB_REQUEST_FEATURE(dev, dev, feature));
}
/*
* Pass the request to use this PCI feature up the tree. Either there's a
* firmware like ACPI that's using this feature that will approve (or deny) the
* request to take it over, or the platform has no such firmware, in which case
* the request will be approved. If the request is approved, the OS is expected
* to make use of the feature or render it harmless.
*/
static int
pcib_request_feature_default(device_t pcib, device_t dev,
enum pci_feature feature)
{
device_t bus;
/*
* Our parent is necessarily a pci bus. Its parent will either be
* another pci bridge (which passes it up) or a host bridge that can
* approve or reject the request.
*/
bus = device_get_parent(pcib);
return (PCIB_REQUEST_FEATURE(device_get_parent(bus), dev, feature));
}
static int
pcib_reset_child(device_t dev, device_t child, int flags)
{
struct pci_devinfo *pdinfo;
int error;
error = 0;
if (dev == NULL || device_get_parent(child) != dev)
goto out;
error = ENXIO;
if (device_get_devclass(child) != devclass_find("pci"))
goto out;
pdinfo = device_get_ivars(dev);
if (pdinfo->cfg.pcie.pcie_location != 0 &&
(pdinfo->cfg.pcie.pcie_type == PCIEM_TYPE_DOWNSTREAM_PORT ||
pdinfo->cfg.pcie.pcie_type == PCIEM_TYPE_ROOT_PORT)) {
error = bus_helper_reset_prepare(child, flags);
if (error == 0) {
error = pcie_link_reset(dev,
pdinfo->cfg.pcie.pcie_location);
/* XXXKIB call _post even if error != 0 ? */
bus_helper_reset_post(child, flags);
}
}
out:
return (error);
}
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