/*
* Copyright 2021 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "runl.h"
#include "cgrp.h"
#include "chan.h"
#include "chid.h"
#include "priv.h"
#include "runq.h"
#include <core/gpuobj.h>
#include <subdev/timer.h>
#include <subdev/top.h>
static struct nvkm_cgrp *
nvkm_engn_cgrp_get(struct nvkm_engn *engn, unsigned long *pirqflags)
{
struct nvkm_cgrp *cgrp = NULL;
struct nvkm_chan *chan;
bool cgid;
int id;
id = engn->func->cxid(engn, &cgid);
if (id < 0)
return NULL;
if (!cgid) {
chan = nvkm_runl_chan_get_chid(engn->runl, id, pirqflags);
if (chan)
cgrp = chan->cgrp;
} else {
cgrp = nvkm_runl_cgrp_get_cgid(engn->runl, id, pirqflags);
}
WARN_ON(!cgrp);
return cgrp;
}
static void
nvkm_runl_rc(struct nvkm_runl *runl)
{
struct nvkm_fifo *fifo = runl->fifo;
struct nvkm_cgrp *cgrp, *gtmp;
struct nvkm_chan *chan, *ctmp;
struct nvkm_engn *engn;
unsigned long flags;
int rc, state, i;
bool reset;
/* Runlist is blocked before scheduling recovery - fetch count. */
BUG_ON(!mutex_is_locked(&runl->mutex));
rc = atomic_xchg(&runl->rc_pending, 0);
if (!rc)
return;
/* Look for channel groups flagged for RC. */
nvkm_runl_foreach_cgrp_safe(cgrp, gtmp, runl) {
state = atomic_cmpxchg(&cgrp->rc, NVKM_CGRP_RC_PENDING, NVKM_CGRP_RC_RUNNING);
if (state == NVKM_CGRP_RC_PENDING) {
/* Disable all channels in them, and remove from runlist. */
nvkm_cgrp_foreach_chan_safe(chan, ctmp, cgrp) {
nvkm_chan_error(chan, false);
nvkm_chan_remove_locked(chan);
}
}
}
/* On GPUs with runlist preempt, wait for PBDMA(s) servicing runlist to go idle. */
if (runl->func->preempt) {
for (i = 0; i < runl->runq_nr; i++) {
struct nvkm_runq *runq = runl->runq[i];
if (runq) {
nvkm_msec(fifo->engine.subdev.device, 2000,
if (runq->func->idle(runq))
break;
);
}
}
}
/* Look for engines that are still on flagged channel groups - reset them. */
nvkm_runl_foreach_engn_cond(engn, runl, engn->func->cxid) {
cgrp = nvkm_engn_cgrp_get(engn, &flags);
if (!cgrp) {
ENGN_DEBUG(engn, "cxid not valid");
continue;
}
reset = atomic_read(&cgrp->rc) == NVKM_CGRP_RC_RUNNING;
nvkm_cgrp_put(&cgrp, flags);
if (!reset) {
ENGN_DEBUG(engn, "cxid not in recovery");
continue;
}
ENGN_DEBUG(engn, "resetting...");
/*TODO: can we do something less of a potential catastrophe on failure? */
WARN_ON(nvkm_engine_reset(engn->engine));
}
/* Submit runlist update, and clear any remaining exception state. */
runl->func->update(runl);
if (runl->func->fault_clear)
runl->func->fault_clear(runl);
/* Unblock runlist processing. */
while (rc--)
nvkm_runl_allow(runl);
runl->func->wait(runl);
}
static void
nvkm_runl_rc_runl(struct nvkm_runl *runl)
{
RUNL_ERROR(runl, "rc scheduled");
nvkm_runl_block(runl);
if (runl->func->preempt)
runl->func->preempt(runl);
atomic_inc(&runl->rc_pending);
schedule_work(&runl->work);
}
void
nvkm_runl_rc_cgrp(struct nvkm_cgrp *cgrp)
{
if (atomic_cmpxchg(&cgrp->rc, NVKM_CGRP_RC_NONE, NVKM_CGRP_RC_PENDING) != NVKM_CGRP_RC_NONE)
return;
CGRP_ERROR(cgrp, "rc scheduled");
nvkm_runl_rc_runl(cgrp->runl);
}
void
nvkm_runl_rc_engn(struct nvkm_runl *runl, struct nvkm_engn *engn)
{
struct nvkm_cgrp *cgrp;
unsigned long flags;
/* Lookup channel group currently on engine. */
cgrp = nvkm_engn_cgrp_get(engn, &flags);
if (!cgrp) {
ENGN_DEBUG(engn, "rc skipped, not on channel");
return;
}
nvkm_runl_rc_cgrp(cgrp);
nvkm_cgrp_put(&cgrp, flags);
}
static void
nvkm_runl_work(struct work_struct *work)
{
struct nvkm_runl *runl = container_of(work, typeof(*runl), work);
mutex_lock(&runl->mutex);
nvkm_runl_rc(runl);
mutex_unlock(&runl->mutex);
}
struct nvkm_chan *
nvkm_runl_chan_get_inst(struct nvkm_runl *runl, u64 inst, unsigned long *pirqflags)
{
struct nvkm_chid *chid = runl->chid;
struct nvkm_chan *chan;
unsigned long flags;
int id;
spin_lock_irqsave(&chid->lock, flags);
for_each_set_bit(id, chid->used, chid->nr) {
chan = chid->data[id];
if (likely(chan)) {
if (chan->inst->addr == inst) {
spin_lock(&chan->cgrp->lock);
*pirqflags = flags;
spin_unlock(&chid->lock);
return chan;
}
}
}
spin_unlock_irqrestore(&chid->lock, flags);
return NULL;
}
struct nvkm_chan *
nvkm_runl_chan_get_chid(struct nvkm_runl *runl, int id, unsigned long *pirqflags)
{
struct nvkm_chid *chid = runl->chid;
struct nvkm_chan *chan;
unsigned long flags;
spin_lock_irqsave(&chid->lock, flags);
if (!WARN_ON(id >= chid->nr)) {
chan = chid->data[id];
if (likely(chan)) {
spin_lock(&chan->cgrp->lock);
*pirqflags = flags;
spin_unlock(&chid->lock);
return chan;
}
}
spin_unlock_irqrestore(&chid->lock, flags);
return NULL;
}
struct nvkm_cgrp *
nvkm_runl_cgrp_get_cgid(struct nvkm_runl *runl, int id, unsigned long *pirqflags)
{
struct nvkm_chid *cgid = runl->cgid;
struct nvkm_cgrp *cgrp;
unsigned long flags;
spin_lock_irqsave(&cgid->lock, flags);
if (!WARN_ON(id >= cgid->nr)) {
cgrp = cgid->data[id];
if (likely(cgrp)) {
spin_lock(&cgrp->lock);
*pirqflags = flags;
spin_unlock(&cgid->lock);
return cgrp;
}
}
spin_unlock_irqrestore(&cgid->lock, flags);
return NULL;
}
int
nvkm_runl_preempt_wait(struct nvkm_runl *runl)
{
return nvkm_msec(runl->fifo->engine.subdev.device, runl->fifo->timeout.chan_msec,
if (!runl->func->preempt_pending(runl))
break;
nvkm_runl_rc(runl);
usleep_range(1, 2);
) < 0 ? -ETIMEDOUT : 0;
}
bool
nvkm_runl_update_pending(struct nvkm_runl *runl)
{
if (!runl->func->pending(runl))
return false;
nvkm_runl_rc(runl);
return true;
}
void
nvkm_runl_update_locked(struct nvkm_runl *runl, bool wait)
{
if (atomic_xchg(&runl->changed, 0) && runl->func->update) {
runl->func->update(runl);
if (wait)
runl->func->wait(runl);
}
}
void
nvkm_runl_allow(struct nvkm_runl *runl)
{
struct nvkm_fifo *fifo = runl->fifo;
unsigned long flags;
spin_lock_irqsave(&fifo->lock, flags);
if (!--runl->blocked) {
RUNL_TRACE(runl, "running");
runl->func->allow(runl, ~0);
}
spin_unlock_irqrestore(&fifo->lock, flags);
}
void
nvkm_runl_block(struct nvkm_runl *runl)
{
struct nvkm_fifo *fifo = runl->fifo;
unsigned long flags;
spin_lock_irqsave(&fifo->lock, flags);
if (!runl->blocked++) {
RUNL_TRACE(runl, "stopped");
runl->func->block(runl, ~0);
}
spin_unlock_irqrestore(&fifo->lock, flags);
}
void
nvkm_runl_fini(struct nvkm_runl *runl)
{
if (runl->func->fini)
runl->func->fini(runl);
flush_work(&runl->work);
}
void
nvkm_runl_del(struct nvkm_runl *runl)
{
struct nvkm_engn *engn, *engt;
nvkm_memory_unref(&runl->mem);
list_for_each_entry_safe(engn, engt, &runl->engns, head) {
list_del(&engn->head);
kfree(engn);
}
nvkm_chid_unref(&runl->chid);
nvkm_chid_unref(&runl->cgid);
list_del(&runl->head);
mutex_destroy(&runl->mutex);
kfree(runl);
}
struct nvkm_engn *
nvkm_runl_add(struct nvkm_runl *runl, int engi, const struct nvkm_engn_func *func,
enum nvkm_subdev_type type, int inst)
{
struct nvkm_fifo *fifo = runl->fifo;
struct nvkm_device *device = fifo->engine.subdev.device;
struct nvkm_engine *engine;
struct nvkm_engn *engn;
engine = nvkm_device_engine(device, type, inst);
if (!engine) {
RUNL_DEBUG(runl, "engn %d.%d[%s] not found", engi, inst, nvkm_subdev_type[type]);
return NULL;
}
if (!(engn = kzalloc(sizeof(*engn), GFP_KERNEL)))
return NULL;
engn->func = func;
engn->runl = runl;
engn->id = engi;
engn->engine = engine;
engn->fault = -1;
list_add_tail(&engn->head, &runl->engns);
/* Lookup MMU engine ID for fault handling. */
if (device->top)
engn->fault = nvkm_top_fault_id(device, engine->subdev.type, engine->subdev.inst);
if (engn->fault < 0 && fifo->func->mmu_fault) {
const struct nvkm_enum *map = fifo->func->mmu_fault->engine;
while (map->name) {
if (map->data2 == engine->subdev.type && map->inst == engine->subdev.inst) {
engn->fault = map->value;
break;
}
map++;
}
}
return engn;
}
struct nvkm_runl *
nvkm_runl_get(struct nvkm_fifo *fifo, int runi, u32 addr)
{
struct nvkm_runl *runl;
nvkm_runl_foreach(runl, fifo) {
if ((runi >= 0 && runl->id == runi) || (runi < 0 && runl->addr == addr))
return runl;
}
return NULL;
}
struct nvkm_runl *
nvkm_runl_new(struct nvkm_fifo *fifo, int runi, u32 addr, int id_nr)
{
struct nvkm_subdev *subdev = &fifo->engine.subdev;
struct nvkm_runl *runl;
int ret;
if (!(runl = kzalloc(sizeof(*runl), GFP_KERNEL)))
return ERR_PTR(-ENOMEM);
runl->func = fifo->func->runl;
runl->fifo = fifo;
runl->id = runi;
runl->addr = addr;
INIT_LIST_HEAD(&runl->engns);
INIT_LIST_HEAD(&runl->cgrps);
atomic_set(&runl->changed, 0);
mutex_init(&runl->mutex);
INIT_WORK(&runl->work, nvkm_runl_work);
atomic_set(&runl->rc_triggered, 0);
atomic_set(&runl->rc_pending, 0);
list_add_tail(&runl->head, &fifo->runls);
if (!fifo->chid) {
if ((ret = nvkm_chid_new(&nvkm_chan_event, subdev, id_nr, 0, id_nr, &runl->cgid)) ||
(ret = nvkm_chid_new(&nvkm_chan_event, subdev, id_nr, 0, id_nr, &runl->chid))) {
RUNL_ERROR(runl, "cgid/chid: %d", ret);
nvkm_runl_del(runl);
return ERR_PTR(ret);
}
} else {
runl->cgid = nvkm_chid_ref(fifo->cgid);
runl->chid = nvkm_chid_ref(fifo->chid);
}
return runl;
}
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