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freebsd-skq/sys/dev/pci/pci_pci.c
jhb fd9eaed2e2 Update the pci_cfg_save/restore routines to operate on bridge devices 
(type 1 and type 2) as well as leaf devices (type 0).  In particular,
this allows the existing PCI bus logic to save and restore capability
registers such as MSI and PCI-express work for bridge devices rather than
requiring that code to be duplicated in bridge drivers.  It also means
that bridge drivers no longer need to save and restore basic registers
such as the PCI command register or BARs nor manage powerstates for the
bridge device.

While here, pci_setup_secbus() has been changed to initialize the 'sec'
and 'sub' fields in the 'secbus' structure instead of requiring the pcib
and pccbb drivers to do this in the NEW_PCIB + PCI_RES_BUS case.

Differential Revision:	https://reviews.freebsd.org/D2240
Reviewed by:	imp, jmg
MFC after:	2 weeks
2015-04-22 22:02:27 +00:00

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/*-
* 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 <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/systm.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 uint16_t pcib_ari_get_rid(device_t pcib, device_t dev);
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);
static device_method_t pcib_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pcib_probe),
DEVMETHOD(device_attach, pcib_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, pcib_suspend),
DEVMETHOD(device_resume, pcib_resume),
/* Bus interface */
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),
/* 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_rid, pcib_ari_get_rid),
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_END
};
static devclass_t pcib_devclass;
DEFINE_CLASS_0(pcib, pcib_driver, pcib_methods, sizeof(struct pcib_softc));
DRIVER_MODULE(pcib, pci, pcib_driver, pcib_devclass, NULL, NULL);
#ifdef NEW_PCIB
SYSCTL_DECL(_hw_pci);
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, u_long start, u_long end, u_long count)
{
u_long 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 %#lx-%#lx 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)(u_long start, u_long end, void *arg);
static void
pcib_walk_nonisa_ranges(u_long start, u_long end, nonisa_callback *cb,
void *arg)
{
u_long 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(u_long start, u_long 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(u_long start, u_long 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 %#lx-%#lx\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, u_long start, u_long 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 != (u_long)max_address)
max_address = ~0ul;
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) {
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);
}
/* 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);
}
}
#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(dev, PCI_RES_BUS, &rid, 0ul, ~0ul,
min_count, 0);
if (bus->res == NULL) {
/*
* Fall back to just allocating a range of a single bus
* number.
*/
bus->res = bus_alloc_resource(dev, PCI_RES_BUS, &rid, 0ul, ~0ul,
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);
}
}
static struct resource *
pcib_suballoc_bus(struct pcib_secbus *bus, device_t child, int *rid,
u_long start, u_long end, u_long 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 (%lu-%lu) 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, u_long new_end)
{
u_long 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 %lu-%lu\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,
u_long start, u_long end, u_long count, u_int flags)
{
struct resource *res;
u_long 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 %lu buses\n", count);
printf("\tback candidate range: %lu-%lu\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
/*
* 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)
{
device_t dev;
#ifndef NEW_PCIB
uint16_t command;
#endif
dev = sc->dev;
#ifdef NEW_PCIB
pcib_write_windows(sc, WIN_IO | WIN_MEM | WIN_PMEM);
#else
command = pci_read_config(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's also a Toshiba bridge that behaves this
* way.
*/
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 NEW_PCIB
#ifdef PCI_RES_BUS
pcib_setup_secbus(dev, &sc->bus, 1);
#endif
pcib_probe_windows(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);
}
int
pcib_attach(device_t dev)
{
struct pcib_softc *sc;
device_t child;
pcib_attach_common(dev);
sc = device_get_softc(dev);
if (sc->bus.sec != 0) {
child = device_add_child(dev, "pci", sc->bus.sec);
if (child != NULL)
return(bus_generic_attach(dev));
}
/* no secondary bus; we should have fixed this */
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));
return (bus_generic_resume(dev));
}
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, u_long start, u_long end, u_long 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 (%#lx-%#lx) 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,
u_long start, u_long end, u_long count, u_int flags)
{
struct resource *res;
u_long 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 = (1ul << 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, 1ul << 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,
u_long base, u_long 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,
u_long start, u_long end, u_long count, u_int flags)
{
u_long 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 = (1ul << 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 (%#lx-%#lx,%#lx)\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 (%#lx-%#lx,%#lx)\n",
w->name, start, end, count);
align = 1ul << 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: %#lx-%#lx\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: %#lx-%#lx\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,
u_long start, u_long end, u_long 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,
u_long start, u_long 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,
u_long start, u_long end, u_long 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 (%lx) < start (%lx)\n",
end, start);
start = 0;
end = 0;
ok = 0;
}
if (!ok) {
device_printf(dev, "%s%srequested unsupported I/O "
"range 0x%lx-0x%lx (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%lx-0x%lx: 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 (%lx) < start (%lx)\n",
end, start);
start = 0;
end = 0;
ok = 0;
}
if (!ok && bootverbose)
device_printf(dev,
"%s%srequested unsupported memory range %#lx-%#lx "
"(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%lx-0x%lx: 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)
{
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 (PCI_SLOTMAX);
}
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)
{
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)
{
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 uint16_t
pcib_ari_get_rid(device_t pcib, device_t dev)
{
struct pcib_softc *sc;
uint8_t bus, slot, func;
sc = device_get_softc(pcib);
if (sc->flags & PCIB_ENABLE_ARI) {
bus = pci_get_bus(dev);
func = pci_get_function(dev);
return (PCI_ARI_RID(bus, func));
} else {
bus = pci_get_bus(dev);
slot = pci_get_slot(dev);
func = pci_get_function(dev);
return (PCI_RID(bus, slot, func));
}
}
/*
* 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);
}
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