freebsd-dev/sys/dev/ntb/ntb.c
2017-09-02 11:56:16 +00:00

521 lines
12 KiB
C

/*-
* Copyright (c) 2016-2017 Alexander Motin <mav@FreeBSD.org>
* 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.
*
* 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/rmlock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include "ntb.h"
devclass_t ntb_hw_devclass;
SYSCTL_NODE(_hw, OID_AUTO, ntb, CTLFLAG_RW, 0, "NTB sysctls");
struct ntb_child {
device_t dev;
int function;
int enabled;
int mwoff;
int mwcnt;
int spadoff;
int spadcnt;
int dboff;
int dbcnt;
uint64_t dbmask;
void *ctx;
const struct ntb_ctx_ops *ctx_ops;
struct rmlock ctx_lock;
struct ntb_child *next;
};
int
ntb_register_device(device_t dev)
{
struct ntb_child **cpp = device_get_softc(dev);
struct ntb_child *nc;
int i, mw, mwu, mwt, spad, spadu, spadt, db, dbu, dbt;
char cfg[128] = "";
char buf[32];
char *n, *np, *c, *p, *name;
mwu = 0;
mwt = NTB_MW_COUNT(dev);
spadu = 0;
spadt = NTB_SPAD_COUNT(dev);
dbu = 0;
dbt = flsll(NTB_DB_VALID_MASK(dev));
device_printf(dev, "%d memory windows, %d scratchpads, "
"%d doorbells\n", mwt, spadt, dbt);
snprintf(buf, sizeof(buf), "hint.%s.%d.config", device_get_name(dev),
device_get_unit(dev));
TUNABLE_STR_FETCH(buf, cfg, sizeof(cfg));
n = cfg;
i = 0;
while ((c = strsep(&n, ",")) != NULL) {
np = c;
name = strsep(&np, ":");
if (name != NULL && name[0] == 0)
name = NULL;
p = strsep(&np, ":");
mw = (p && p[0] != 0) ? strtol(p, NULL, 10) : mwt - mwu;
p = strsep(&np, ":");
spad = (p && p[0] != 0) ? strtol(p, NULL, 10) : spadt - spadu;
db = (np && np[0] != 0) ? strtol(np, NULL, 10) : dbt - dbu;
if (mw > mwt - mwu || spad > spadt - spadu || db > dbt - dbu) {
device_printf(dev, "Not enough resources for config\n");
break;
}
nc = malloc(sizeof(*nc), M_DEVBUF, M_WAITOK | M_ZERO);
nc->function = i;
nc->mwoff = mwu;
nc->mwcnt = mw;
nc->spadoff = spadu;
nc->spadcnt = spad;
nc->dboff = dbu;
nc->dbcnt = db;
nc->dbmask = (db == 0) ? 0 : (0xffffffffffffffff >> (64 - db));
rm_init(&nc->ctx_lock, "ntb ctx");
nc->dev = device_add_child(dev, name, -1);
if (nc->dev == NULL) {
ntb_unregister_device(dev);
return (ENOMEM);
}
device_set_ivars(nc->dev, nc);
*cpp = nc;
cpp = &nc->next;
if (bootverbose) {
device_printf(dev, "%d \"%s\":", i, name);
if (mw > 0) {
printf(" memory windows %d", mwu);
if (mw > 1)
printf("-%d", mwu + mw - 1);
}
if (spad > 0) {
printf(" scratchpads %d", spadu);
if (spad > 1)
printf("-%d", spadu + spad - 1);
}
if (db > 0) {
printf(" doorbells %d", dbu);
if (db > 1)
printf("-%d", dbu + db - 1);
}
printf("\n");
}
mwu += mw;
spadu += spad;
dbu += db;
i++;
}
bus_generic_attach(dev);
return (0);
}
int
ntb_unregister_device(device_t dev)
{
struct ntb_child **cpp = device_get_softc(dev);
struct ntb_child *nc;
int error = 0;
while ((nc = *cpp) != NULL) {
*cpp = (*cpp)->next;
error = device_delete_child(dev, nc->dev);
if (error)
break;
rm_destroy(&nc->ctx_lock);
free(nc, M_DEVBUF);
}
return (error);
}
int
ntb_child_location_str(device_t dev, device_t child, char *buf,
size_t buflen)
{
struct ntb_child *nc = device_get_ivars(child);
snprintf(buf, buflen, "function=%d", nc->function);
return (0);
}
int
ntb_print_child(device_t dev, device_t child)
{
struct ntb_child *nc = device_get_ivars(child);
int retval;
retval = bus_print_child_header(dev, child);
if (nc->mwcnt > 0) {
printf(" mw %d", nc->mwoff);
if (nc->mwcnt > 1)
printf("-%d", nc->mwoff + nc->mwcnt - 1);
}
if (nc->spadcnt > 0) {
printf(" spad %d", nc->spadoff);
if (nc->spadcnt > 1)
printf("-%d", nc->spadoff + nc->spadcnt - 1);
}
if (nc->dbcnt > 0) {
printf(" db %d", nc->dboff);
if (nc->dbcnt > 1)
printf("-%d", nc->dboff + nc->dbcnt - 1);
}
retval += printf(" at function %d", nc->function);
retval += bus_print_child_domain(dev, child);
retval += bus_print_child_footer(dev, child);
return (retval);
}
void
ntb_link_event(device_t dev)
{
struct ntb_child **cpp = device_get_softc(dev);
struct ntb_child *nc;
struct rm_priotracker ctx_tracker;
enum ntb_speed speed;
enum ntb_width width;
if (NTB_LINK_IS_UP(dev, &speed, &width)) {
device_printf(dev, "Link is up (PCIe %d.x / x%d)\n",
(int)speed, (int)width);
} else {
device_printf(dev, "Link is down\n");
}
for (nc = *cpp; nc != NULL; nc = nc->next) {
rm_rlock(&nc->ctx_lock, &ctx_tracker);
if (nc->ctx_ops != NULL && nc->ctx_ops->link_event != NULL)
nc->ctx_ops->link_event(nc->ctx);
rm_runlock(&nc->ctx_lock, &ctx_tracker);
}
}
void
ntb_db_event(device_t dev, uint32_t vec)
{
struct ntb_child **cpp = device_get_softc(dev);
struct ntb_child *nc;
struct rm_priotracker ctx_tracker;
for (nc = *cpp; nc != NULL; nc = nc->next) {
rm_rlock(&nc->ctx_lock, &ctx_tracker);
if (nc->ctx_ops != NULL && nc->ctx_ops->db_event != NULL)
nc->ctx_ops->db_event(nc->ctx, vec);
rm_runlock(&nc->ctx_lock, &ctx_tracker);
}
}
bool
ntb_link_is_up(device_t ntb, enum ntb_speed *speed, enum ntb_width *width)
{
return (NTB_LINK_IS_UP(device_get_parent(ntb), speed, width));
}
int
ntb_link_enable(device_t ntb, enum ntb_speed speed, enum ntb_width width)
{
struct ntb_child *nc = device_get_ivars(ntb);
struct ntb_child **cpp = device_get_softc(device_get_parent(nc->dev));
struct ntb_child *nc1;
for (nc1 = *cpp; nc1 != NULL; nc1 = nc1->next) {
if (nc1->enabled) {
nc->enabled = 1;
return (0);
}
}
nc->enabled = 1;
return (NTB_LINK_ENABLE(device_get_parent(ntb), speed, width));
}
int
ntb_link_disable(device_t ntb)
{
struct ntb_child *nc = device_get_ivars(ntb);
struct ntb_child **cpp = device_get_softc(device_get_parent(nc->dev));
struct ntb_child *nc1;
if (!nc->enabled)
return (0);
nc->enabled = 0;
for (nc1 = *cpp; nc1 != NULL; nc1 = nc1->next) {
if (nc1->enabled)
return (0);
}
return (NTB_LINK_DISABLE(device_get_parent(ntb)));
}
bool
ntb_link_enabled(device_t ntb)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (nc->enabled && NTB_LINK_ENABLED(device_get_parent(ntb)));
}
int
ntb_set_ctx(device_t ntb, void *ctx, const struct ntb_ctx_ops *ctx_ops)
{
struct ntb_child *nc = device_get_ivars(ntb);
if (ctx == NULL || ctx_ops == NULL)
return (EINVAL);
rm_wlock(&nc->ctx_lock);
if (nc->ctx_ops != NULL) {
rm_wunlock(&nc->ctx_lock);
return (EINVAL);
}
nc->ctx = ctx;
nc->ctx_ops = ctx_ops;
/*
* If applicaiton driver asks for link events, generate fake one now
* to let it update link state without races while we hold the lock.
*/
if (ctx_ops->link_event != NULL)
ctx_ops->link_event(ctx);
rm_wunlock(&nc->ctx_lock);
return (0);
}
void *
ntb_get_ctx(device_t ntb, const struct ntb_ctx_ops **ctx_ops)
{
struct ntb_child *nc = device_get_ivars(ntb);
KASSERT(nc->ctx != NULL && nc->ctx_ops != NULL, ("bogus"));
if (ctx_ops != NULL)
*ctx_ops = nc->ctx_ops;
return (nc->ctx);
}
void
ntb_clear_ctx(device_t ntb)
{
struct ntb_child *nc = device_get_ivars(ntb);
rm_wlock(&nc->ctx_lock);
nc->ctx = NULL;
nc->ctx_ops = NULL;
rm_wunlock(&nc->ctx_lock);
}
uint8_t
ntb_mw_count(device_t ntb)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (nc->mwcnt);
}
int
ntb_mw_get_range(device_t ntb, unsigned mw_idx, vm_paddr_t *base,
caddr_t *vbase, size_t *size, size_t *align, size_t *align_size,
bus_addr_t *plimit)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_MW_GET_RANGE(device_get_parent(ntb), mw_idx + nc->mwoff,
base, vbase, size, align, align_size, plimit));
}
int
ntb_mw_set_trans(device_t ntb, unsigned mw_idx, bus_addr_t addr, size_t size)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_MW_SET_TRANS(device_get_parent(ntb), mw_idx + nc->mwoff,
addr, size));
}
int
ntb_mw_clear_trans(device_t ntb, unsigned mw_idx)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_MW_CLEAR_TRANS(device_get_parent(ntb), mw_idx + nc->mwoff));
}
int
ntb_mw_get_wc(device_t ntb, unsigned mw_idx, vm_memattr_t *mode)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_MW_GET_WC(device_get_parent(ntb), mw_idx + nc->mwoff, mode));
}
int
ntb_mw_set_wc(device_t ntb, unsigned mw_idx, vm_memattr_t mode)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_MW_SET_WC(device_get_parent(ntb), mw_idx + nc->mwoff, mode));
}
uint8_t
ntb_spad_count(device_t ntb)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (nc->spadcnt);
}
void
ntb_spad_clear(device_t ntb)
{
struct ntb_child *nc = device_get_ivars(ntb);
unsigned i;
for (i = 0; i < nc->spadcnt; i++)
NTB_SPAD_WRITE(device_get_parent(ntb), i + nc->spadoff, 0);
}
int
ntb_spad_write(device_t ntb, unsigned int idx, uint32_t val)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_SPAD_WRITE(device_get_parent(ntb), idx + nc->spadoff, val));
}
int
ntb_spad_read(device_t ntb, unsigned int idx, uint32_t *val)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_SPAD_READ(device_get_parent(ntb), idx + nc->spadoff, val));
}
int
ntb_peer_spad_write(device_t ntb, unsigned int idx, uint32_t val)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_PEER_SPAD_WRITE(device_get_parent(ntb), idx + nc->spadoff,
val));
}
int
ntb_peer_spad_read(device_t ntb, unsigned int idx, uint32_t *val)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_PEER_SPAD_READ(device_get_parent(ntb), idx + nc->spadoff,
val));
}
uint64_t
ntb_db_valid_mask(device_t ntb)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (nc->dbmask);
}
int
ntb_db_vector_count(device_t ntb)
{
return (NTB_DB_VECTOR_COUNT(device_get_parent(ntb)));
}
uint64_t
ntb_db_vector_mask(device_t ntb, uint32_t vector)
{
struct ntb_child *nc = device_get_ivars(ntb);
return ((NTB_DB_VECTOR_MASK(device_get_parent(ntb), vector)
>> nc->dboff) & nc->dbmask);
}
int
ntb_peer_db_addr(device_t ntb, bus_addr_t *db_addr, vm_size_t *db_size)
{
return (NTB_PEER_DB_ADDR(device_get_parent(ntb), db_addr, db_size));
}
void
ntb_db_clear(device_t ntb, uint64_t bits)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_DB_CLEAR(device_get_parent(ntb), bits << nc->dboff));
}
void
ntb_db_clear_mask(device_t ntb, uint64_t bits)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_DB_CLEAR_MASK(device_get_parent(ntb), bits << nc->dboff));
}
uint64_t
ntb_db_read(device_t ntb)
{
struct ntb_child *nc = device_get_ivars(ntb);
return ((NTB_DB_READ(device_get_parent(ntb)) >> nc->dboff)
& nc->dbmask);
}
void
ntb_db_set_mask(device_t ntb, uint64_t bits)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_DB_SET_MASK(device_get_parent(ntb), bits << nc->dboff));
}
void
ntb_peer_db_set(device_t ntb, uint64_t bits)
{
struct ntb_child *nc = device_get_ivars(ntb);
return (NTB_PEER_DB_SET(device_get_parent(ntb), bits << nc->dboff));
}
MODULE_VERSION(ntb, 1);