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freebsd-src/sys/dev/pci/pci_pci.c
John Baldwin 98056127dd acpi/pci/vmd: Fix a nit with nested resource mapping requests 
Some bus drivers use rmans to suballocate resources to child devices.
When the driver for a child device requests a mapping for a
suballocated resource, the bus driver translates this into a mapping
request for a suitable subrange of the original resource the bus
driver allocated from its parent.  This nested mapping request should
look like any other resource mapping request being made by the bus
device (i.e. as if the bus device had called bus_map_resource() or
bus_alloc_resource() with RF_ACTIVE).

I had slightly flubbed this last bit though since the direct use of
bus_generic_map/unmap_resource passed up the original child device
(second argument to the underlying kobj interface).  While this is
currently harmless, it is not strictly correct as the resource being
mapped is owned by the bus device, not the child and can break for
other bus drivers in the future.

Instead, use bus_map/unmap_resource for the nested request where the
requesting device is now the bus device that owns the parent resource.

Reviewed by:	imp
Fixes:		0e1246e334 acpi: Cleanup handling of suballocated resources
Fixes:		b377ff8110 pcib: Refine handling of resources allocated from bridge windows
Fixes:		d79b6b8ec2 pci_host_generic: Don't rewrite resource start address for translation
Fixes:		d714e73f78 vmd: Use bus_generic_rman_* for PCI bus and memory resources
Differential Revision:	https://reviews.freebsd.org/D45433
2024-06-04 16:51:14 -07:00

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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>
/*
* 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 bus_child_present_t pcib_child_present;
static bus_alloc_resource_t pcib_alloc_resource;
#ifdef NEW_PCIB
static bus_adjust_resource_t pcib_adjust_resource;
static bus_release_resource_t pcib_release_resource;
static bus_activate_resource_t pcib_activate_resource;
static bus_deactivate_resource_t pcib_deactivate_resource;
static bus_map_resource_t pcib_map_resource;
static bus_unmap_resource_t pcib_unmap_resource;
#endif
static int pcib_reset_child(device_t dev, device_t child, int flags);
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, int pending);
static void pcib_pcie_cc_timeout(void *arg, int pending);
static void pcib_pcie_dll_timeout(void *arg, int pending);
#endif
static int pcib_request_feature_default(device_t pcib, device_t dev,
enum pci_feature feature);
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),
DEVMETHOD(bus_activate_resource, pcib_activate_resource),
DEVMETHOD(bus_deactivate_resource, pcib_deactivate_resource),
DEVMETHOD(bus_map_resource, pcib_map_resource),
DEVMETHOD(bus_unmap_resource, pcib_unmap_resource),
#else
DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
#endif
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
};
DEFINE_CLASS_0(pcib, pcib_driver, pcib_methods, sizeof(struct pcib_softc));
EARLY_DRIVER_MODULE(pcib, pci, pcib_driver, 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.");
/*
* Get the corresponding window if this resource from a child device was
* sub-allocated from one of our window resource managers.
*/
static struct pcib_window *
pcib_get_resource_window(struct pcib_softc *sc, struct resource *r)
{
switch (rman_get_type(r)) {
case SYS_RES_IOPORT:
if (rman_is_region_manager(r, &sc->io.rman))
return (&sc->io);
break;
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 (&sc->pmem);
if (rman_is_region_manager(r, &sc->mem.rman))
return (&sc->mem);
break;
}
return (NULL);
}
/*
* 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, struct resource *r)
{
#ifdef PCI_RES_BUS
if (rman_get_type(r) == PCI_RES_BUS)
return (rman_is_region_manager(r, &sc->bus.rman));
#endif
return (pcib_get_resource_window(sc, r) != NULL);
}
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, RF_ACTIVE | RF_UNMAPPED);
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 | RF_ACTIVE | RF_UNMAPPED);
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, RF_ACTIVE);
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, RF_ACTIVE);
} 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);
rman_set_type(res, PCI_RES_BUS);
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)
taskqueue_enqueue_timeout(taskqueue_pci_hp,
&sc->pcie_cc_task, hz);
}
}
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;
taskqueue_cancel_timeout(taskqueue_pci_hp, &sc->pcie_cc_task, NULL);
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 int pci_enable_pcie_ei = 0;
SYSCTL_INT(_hw_pci, OID_AUTO, enable_pcie_ei, CTLFLAG_RWTUN,
&pci_enable_pcie_ei, 0,
"Enable support for PCI-express Electromechanical Interlock.");
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) &&
pci_enable_pcie_ei) {
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
taskqueue_enqueue_timeout(taskqueue_pci_hp,
&sc->pcie_dll_task, hz);
} else if (sc->pcie_link_sta & PCIEM_LINK_STA_DL_ACTIVE)
taskqueue_cancel_timeout(taskqueue_pci_hp, &sc->pcie_dll_task,
NULL);
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;
taskqueue_cancel_timeout(taskqueue_pci_hp,
&sc->pcie_ab_task, NULL);
} 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;
taskqueue_enqueue_timeout(taskqueue_pci_hp,
&sc->pcie_ab_task, 5 * hz);
}
}
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, int pending)
{
struct pcib_softc *sc = arg;
PCIB_HP_LOCK(sc);
if (sc->flags & PCIB_DETACH_PENDING) {
sc->flags |= PCIB_DETACHING;
sc->flags &= ~PCIB_DETACH_PENDING;
pcib_pcie_hotplug_update(sc, 0, 0, true);
}
PCIB_HP_UNLOCK(sc);
}
static void
pcib_pcie_cc_timeout(void *arg, int pending)
{
struct pcib_softc *sc = arg;
device_t dev = sc->dev;
uint16_t sta;
PCIB_HP_LOCK(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);
}
PCIB_HP_UNLOCK(sc);
}
static void
pcib_pcie_dll_timeout(void *arg, int pending)
{
struct pcib_softc *sc = arg;
device_t dev = sc->dev;
uint16_t sta;
PCIB_HP_LOCK(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);
}
PCIB_HP_UNLOCK(sc);
}
static int
pcib_alloc_pcie_irq(struct pcib_softc *sc)
{
device_t dev;
int count, error, mem_rid, 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) {
mem_rid = pci_msix_table_bar(dev);
sc->pcie_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
&mem_rid, RF_ACTIVE);
if (sc->pcie_mem == NULL) {
device_printf(dev,
"Failed to allocate BAR for MSI-X table\n");
} else {
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);
error = pci_release_msi(dev);
if (error)
return (error);
if (sc->pcie_mem != NULL)
error = bus_free_resource(dev, SYS_RES_MEMORY, sc->pcie_mem);
return (error);
}
static void
pcib_setup_hotplug(struct pcib_softc *sc)
{
device_t dev;
uint16_t mask, val;
dev = sc->dev;
TASK_INIT(&sc->pcie_hp_task, 0, pcib_pcie_hotplug_task, sc);
TIMEOUT_TASK_INIT(taskqueue_pci_hp, &sc->pcie_ab_task, 0,
pcib_pcie_ab_timeout, sc);
TIMEOUT_TASK_INIT(taskqueue_pci_hp, &sc->pcie_cc_task, 0,
pcib_pcie_cc_timeout, sc);
TIMEOUT_TASK_INIT(taskqueue_pci_hp, &sc->pcie_dll_task, 0,
pcib_pcie_dll_timeout, sc);
sc->pcie_hp_lock = bus_topo_mtx();
/* 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;
taskqueue_cancel_timeout(taskqueue_pci_hp, &sc->pcie_ab_task,
NULL);
}
sc->flags |= PCIB_DETACHING;
if (sc->flags & PCIB_HOTPLUG_CMD_PENDING) {
taskqueue_cancel_timeout(taskqueue_pci_hp, &sc->pcie_cc_task,
NULL);
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);
taskqueue_drain_timeout(taskqueue_pci_hp, &sc->pcie_ab_task);
taskqueue_drain_timeout(taskqueue_pci_hp, &sc->pcie_cc_task);
taskqueue_drain_timeout(taskqueue_pci_hp, &sc->pcie_dll_task);
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);
rman_set_type(res, type);
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 | RF_UNMAPPED);
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.
*/
static 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);
}
static int
pcib_adjust_resource(device_t bus, device_t child, struct resource *r,
rman_res_t start, rman_res_t end)
{
struct pcib_softc *sc;
struct pcib_window *w;
rman_res_t wmask;
int error, type;
sc = device_get_softc(bus);
type = rman_get_type(r);
/*
* If the resource wasn't sub-allocated from one of our region
* managers then just pass the request up.
*/
if (!pcib_is_resource_managed(sc, r))
return (bus_generic_adjust_resource(bus, child, r, start, end));
#ifdef PCI_RES_BUS
if (type == PCI_RES_BUS) {
/*
* If our bus range isn't big enough to grow the sub-allocation
* then we need to grow our bus range. Any request that would
* require us to decrease the start of our own bus range is
* invalid, we can only extend the end; ignore such requests
* and let rman_adjust_resource fail below.
*/
if (start >= sc->bus.sec && end > sc->bus.sub) {
error = pcib_grow_subbus(&sc->bus, end);
if (error != 0)
return (error);
}
} else
#endif
{
/*
* Resource is managed and not a secondary bus number, must
* be from one of our windows.
*/
w = pcib_get_resource_window(sc, r);
KASSERT(w != NULL,
("%s: no window for resource (%#jx-%#jx) type %d",
__func__, rman_get_start(r), rman_get_end(r), type));
/*
* If our window isn't big enough to grow the sub-allocation
* then we need to expand the window.
*/
if (start < w->base || end > w->limit) {
wmask = ((rman_res_t)1 << w->step) - 1;
error = pcib_expand_window(sc, w, type,
MIN(start & ~wmask, w->base),
MAX(end | wmask, w->limit));
if (error != 0)
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);
pcib_write_windows(sc, w->mask);
}
}
return (rman_adjust_resource(r, start, end));
}
static int
pcib_release_resource(device_t dev, device_t child, struct resource *r)
{
struct pcib_softc *sc;
int error;
sc = device_get_softc(dev);
if (pcib_is_resource_managed(sc, r)) {
if (rman_get_flags(r) & RF_ACTIVE) {
error = bus_deactivate_resource(child, r);
if (error)
return (error);
}
return (rman_release_resource(r));
}
return (bus_generic_release_resource(dev, child, r));
}
static int
pcib_activate_resource(device_t dev, device_t child, struct resource *r)
{
struct pcib_softc *sc = device_get_softc(dev);
struct resource_map map;
int error, type;
if (!pcib_is_resource_managed(sc, r))
return (bus_generic_activate_resource(dev, child, r));
error = rman_activate_resource(r);
if (error != 0)
return (error);
type = rman_get_type(r);
if ((rman_get_flags(r) & RF_UNMAPPED) == 0 &&
(type == SYS_RES_MEMORY || type == SYS_RES_IOPORT)) {
error = BUS_MAP_RESOURCE(dev, child, r, NULL, &map);
if (error != 0) {
rman_deactivate_resource(r);
return (error);
}
rman_set_mapping(r, &map);
}
return (0);
}
static int
pcib_deactivate_resource(device_t dev, device_t child, struct resource *r)
{
struct pcib_softc *sc = device_get_softc(dev);
struct resource_map map;
int error, type;
if (!pcib_is_resource_managed(sc, r))
return (bus_generic_deactivate_resource(dev, child, r));
error = rman_deactivate_resource(r);
if (error != 0)
return (error);
type = rman_get_type(r);
if ((rman_get_flags(r) & RF_UNMAPPED) == 0 &&
(type == SYS_RES_MEMORY || type == SYS_RES_IOPORT)) {
rman_get_mapping(r, &map);
BUS_UNMAP_RESOURCE(dev, child, r, &map);
}
return (0);
}
static struct resource *
pcib_find_parent_resource(struct pcib_window *w, struct resource *r)
{
for (int i = 0; i < w->count; i++) {
if (rman_get_start(w->res[i]) <= rman_get_start(r) &&
rman_get_end(w->res[i]) >= rman_get_end(r))
return (w->res[i]);
}
return (NULL);
}
static int
pcib_map_resource(device_t dev, device_t child, struct resource *r,
struct resource_map_request *argsp, struct resource_map *map)
{
struct pcib_softc *sc = device_get_softc(dev);
struct resource_map_request args;
struct pcib_window *w;
struct resource *pres;
rman_res_t length, start;
int error;
w = pcib_get_resource_window(sc, r);
if (w == NULL)
return (bus_generic_map_resource(dev, child, r, argsp, map));
/* Resources must be active to be mapped. */
if (!(rman_get_flags(r) & RF_ACTIVE))
return (ENXIO);
resource_init_map_request(&args);
error = resource_validate_map_request(r, argsp, &args, &start, &length);
if (error)
return (error);
pres = pcib_find_parent_resource(w, r);
if (pres == NULL)
return (ENOENT);
args.offset = start - rman_get_start(pres);
args.length = length;
return (bus_map_resource(dev, pres, &args, map));
}
static int
pcib_unmap_resource(device_t dev, device_t child, struct resource *r,
struct resource_map *map)
{
struct pcib_softc *sc = device_get_softc(dev);
struct pcib_window *w;
struct resource *pres;
w = pcib_get_resource_window(sc, r);
if (w == NULL)
return (bus_generic_unmap_resource(dev, child, r, map));
pres = pcib_find_parent_resource(w, r);
if (pres == NULL)
return (ENOENT);
return (bus_unmap_resource(dev, pres, map));
}
#else
/*
* We have to trap resource allocation requests and ensure that the bridge
* is set up to, or capable of handling them.
*/
static 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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