/*
* Virtualized GPU Fifo
*
* Copyright (c) 2014-2016, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/dma-mapping.h>
#include <trace/events/gk20a.h>
#include "vgpu/vgpu.h"
#include "gk20a/ctxsw_trace_gk20a.h"
#include "gk20a/hw_fifo_gk20a.h"
#include "gk20a/hw_ram_gk20a.h"
static void vgpu_channel_bind(struct channel_gk20a *ch)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_config_params *p =
&msg.params.channel_config;
int err;
gk20a_dbg_info("bind channel %d", ch->hw_chid);
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_BIND;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
ch->bound = true;
}
static void vgpu_channel_unbind(struct channel_gk20a *ch)
{
gk20a_dbg_fn("");
if (ch->bound) {
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_config_params *p =
&msg.params.channel_config;
int err;
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_UNBIND;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
}
ch->bound = false;
}
static int vgpu_channel_alloc_inst(struct gk20a *g, struct channel_gk20a *ch)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_hwctx_params *p = &msg.params.channel_hwctx;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_ALLOC_HWCTX;
msg.handle = vgpu_get_handle(g);
p->id = ch->hw_chid;
p->pid = (u64)current->tgid;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
if (err || msg.ret) {
gk20a_err(dev_from_gk20a(g), "fail");
return -ENOMEM;
}
ch->virt_ctx = p->handle;
gk20a_dbg_fn("done");
return 0;
}
static void vgpu_channel_free_inst(struct gk20a *g, struct channel_gk20a *ch)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_hwctx_params *p = &msg.params.channel_hwctx;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_FREE_HWCTX;
msg.handle = vgpu_get_handle(g);
p->handle = ch->virt_ctx;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
}
static void vgpu_channel_enable(struct channel_gk20a *ch)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_config_params *p =
&msg.params.channel_config;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_ENABLE;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
}
static void vgpu_channel_disable(struct channel_gk20a *ch)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_config_params *p =
&msg.params.channel_config;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_DISABLE;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
}
static int vgpu_channel_setup_ramfc(struct channel_gk20a *ch, u64 gpfifo_base,
u32 gpfifo_entries, u32 flags)
{
struct device __maybe_unused *d = dev_from_gk20a(ch->g);
struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(d);
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_ramfc_params *p = &msg.params.ramfc;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_SETUP_RAMFC;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
p->gpfifo_va = gpfifo_base;
p->num_entries = gpfifo_entries;
p->userd_addr = ch->userd_iova;
p->iova = mapping ? 1 : 0;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
return (err || msg.ret) ? -ENOMEM : 0;
}
static int vgpu_fifo_init_engine_info(struct fifo_gk20a *f)
{
struct fifo_engine_info_gk20a *gr_info;
struct fifo_engine_info_gk20a *ce_info;
const u32 gr_sw_id = ENGINE_GR_GK20A;
const u32 ce_sw_id = ENGINE_GRCE_GK20A;
gk20a_dbg_fn("");
f->num_engines = 2;
gr_info = &f->engine_info[0];
/* FIXME: retrieve this from server */
gr_info->runlist_id = 0;
gr_info->engine_enum = gr_sw_id;
f->active_engines_list[0] = 0;
ce_info = &f->engine_info[1];
ce_info->runlist_id = 0;
ce_info->inst_id = 2;
ce_info->engine_enum = ce_sw_id;
f->active_engines_list[1] = 1;
return 0;
}
static int init_runlist(struct gk20a *g, struct fifo_gk20a *f)
{
struct fifo_runlist_info_gk20a *runlist;
struct device *d = dev_from_gk20a(g);
s32 runlist_id = -1;
u32 i;
u64 runlist_size;
gk20a_dbg_fn("");
f->max_runlists = g->ops.fifo.eng_runlist_base_size();
f->runlist_info = kzalloc(sizeof(struct fifo_runlist_info_gk20a) *
f->max_runlists, GFP_KERNEL);
if (!f->runlist_info)
goto clean_up_runlist;
memset(f->runlist_info, 0, (sizeof(struct fifo_runlist_info_gk20a) *
f->max_runlists));
for (runlist_id = 0; runlist_id < f->max_runlists; runlist_id++) {
runlist = &f->runlist_info[runlist_id];
runlist->active_channels =
kzalloc(DIV_ROUND_UP(f->num_channels, BITS_PER_BYTE),
GFP_KERNEL);
if (!runlist->active_channels)
goto clean_up_runlist;
runlist_size = sizeof(u16) * f->num_channels;
for (i = 0; i < MAX_RUNLIST_BUFFERS; i++) {
int err = gk20a_gmmu_alloc_sys(g, runlist_size,
&runlist->mem[i]);
if (err) {
dev_err(d, "memory allocation failed\n");
goto clean_up_runlist;
}
}
mutex_init(&runlist->mutex);
/* None of buffers is pinned if this value doesn't change.
Otherwise, one of them (cur_buffer) must have been pinned. */
runlist->cur_buffer = MAX_RUNLIST_BUFFERS;
}
gk20a_dbg_fn("done");
return 0;
clean_up_runlist:
gk20a_fifo_delete_runlist(f);
gk20a_dbg_fn("fail");
return -ENOMEM;
}
static int vgpu_init_fifo_setup_sw(struct gk20a *g)
{
struct fifo_gk20a *f = &g->fifo;
struct device *d = dev_from_gk20a(g);
struct vgpu_priv_data *priv = vgpu_get_priv_data(g);
int chid, err = 0;
gk20a_dbg_fn("");
if (f->sw_ready) {
gk20a_dbg_fn("skip init");
return 0;
}
f->g = g;
f->num_channels = priv->constants.num_channels;
f->max_engines = nvgpu_get_litter_value(g, GPU_LIT_HOST_NUM_ENGINES);
f->userd_entry_size = 1 << ram_userd_base_shift_v();
err = gk20a_gmmu_alloc_sys(g, f->userd_entry_size * f->num_channels,
&f->userd);
if (err) {
dev_err(d, "memory allocation failed\n");
goto clean_up;
}
/* bar1 va */
f->userd.gpu_va = vgpu_bar1_map(g, &f->userd.sgt, f->userd.size);
if (!f->userd.gpu_va) {
dev_err(d, "gmmu mapping failed\n");
goto clean_up;
}
/* if reduced BAR1 range is specified, use offset of 0
(server returns offset assuming full BAR1 range) */
if (resource_size(g->bar1_mem) == (resource_size_t)f->userd.size)
f->userd.gpu_va = 0;
gk20a_dbg(gpu_dbg_map, "userd bar1 va = 0x%llx", f->userd.gpu_va);
f->channel = vzalloc(f->num_channels * sizeof(*f->channel));
f->tsg = vzalloc(f->num_channels * sizeof(*f->tsg));
f->engine_info = kzalloc(f->max_engines * sizeof(*f->engine_info),
GFP_KERNEL);
f->active_engines_list = kzalloc(f->max_engines * sizeof(u32),
GFP_KERNEL);
if (!(f->channel && f->tsg && f->engine_info && f->active_engines_list)) {
err = -ENOMEM;
goto clean_up;
}
memset(f->active_engines_list, 0xff, (f->max_engines * sizeof(u32)));
g->ops.fifo.init_engine_info(f);
init_runlist(g, f);
INIT_LIST_HEAD(&f->free_chs);
mutex_init(&f->free_chs_mutex);
for (chid = 0; chid < f->num_channels; chid++) {
f->channel[chid].userd_iova =
g->ops.mm.get_iova_addr(g, f->userd.sgt->sgl, 0)
+ chid * f->userd_entry_size;
f->channel[chid].userd_gpu_va =
f->userd.gpu_va + chid * f->userd_entry_size;
gk20a_init_channel_support(g, chid);
gk20a_init_tsg_support(g, chid);
}
mutex_init(&f->tsg_inuse_mutex);
f->deferred_reset_pending = false;
mutex_init(&f->deferred_reset_mutex);
f->sw_ready = true;
gk20a_dbg_fn("done");
return 0;
clean_up:
gk20a_dbg_fn("fail");
/* FIXME: unmap from bar1 */
gk20a_gmmu_free(g, &f->userd);
memset(&f->userd, 0, sizeof(f->userd));
vfree(f->channel);
f->channel = NULL;
vfree(f->tsg);
f->tsg = NULL;
kfree(f->engine_info);
f->engine_info = NULL;
kfree(f->active_engines_list);
f->active_engines_list = NULL;
return err;
}
static int vgpu_init_fifo_setup_hw(struct gk20a *g)
{
gk20a_dbg_fn("");
/* test write, read through bar1 @ userd region before
* turning on the snooping */
{
struct fifo_gk20a *f = &g->fifo;
u32 v, v1 = 0x33, v2 = 0x55;
u32 bar1_vaddr = f->userd.gpu_va;
volatile u32 *cpu_vaddr = f->userd.cpu_va;
gk20a_dbg_info("test bar1 @ vaddr 0x%x",
bar1_vaddr);
v = gk20a_bar1_readl(g, bar1_vaddr);
*cpu_vaddr = v1;
smp_mb();
if (v1 != gk20a_bar1_readl(g, bar1_vaddr)) {
gk20a_err(dev_from_gk20a(g), "bar1 broken @ gk20a!");
return -EINVAL;
}
gk20a_bar1_writel(g, bar1_vaddr, v2);
if (v2 != gk20a_bar1_readl(g, bar1_vaddr)) {
gk20a_err(dev_from_gk20a(g), "bar1 broken @ gk20a!");
return -EINVAL;
}
/* is it visible to the cpu? */
if (*cpu_vaddr != v2) {
gk20a_err(dev_from_gk20a(g),
"cpu didn't see bar1 write @ %p!",
cpu_vaddr);
}
/* put it back */
gk20a_bar1_writel(g, bar1_vaddr, v);
}
gk20a_dbg_fn("done");
return 0;
}
int vgpu_init_fifo_support(struct gk20a *g)
{
u32 err;
gk20a_dbg_fn("");
err = vgpu_init_fifo_setup_sw(g);
if (err)
return err;
err = vgpu_init_fifo_setup_hw(g);
return err;
}
static int vgpu_fifo_preempt_channel(struct gk20a *g, u32 hw_chid)
{
struct fifo_gk20a *f = &g->fifo;
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_config_params *p =
&msg.params.channel_config;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_PREEMPT;
msg.handle = vgpu_get_handle(g);
p->handle = f->channel[hw_chid].virt_ctx;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
if (err || msg.ret) {
gk20a_err(dev_from_gk20a(g),
"preempt channel %d failed\n", hw_chid);
err = -ENOMEM;
}
return err;
}
static int vgpu_fifo_preempt_tsg(struct gk20a *g, u32 tsgid)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_tsg_preempt_params *p =
&msg.params.tsg_preempt;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_TSG_PREEMPT;
msg.handle = vgpu_get_handle(g);
p->tsg_id = tsgid;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
err = err ? err : msg.ret;
if (err) {
gk20a_err(dev_from_gk20a(g),
"preempt tsg %u failed\n", tsgid);
}
return err;
}
static int vgpu_submit_runlist(u64 handle, u8 runlist_id, u16 *runlist,
u32 num_entries)
{
struct tegra_vgpu_cmd_msg *msg;
struct tegra_vgpu_runlist_params *p;
size_t size = sizeof(*msg) + sizeof(*runlist) * num_entries;
char *ptr;
int err;
msg = kmalloc(size, GFP_KERNEL);
if (!msg)
return -1;
msg->cmd = TEGRA_VGPU_CMD_SUBMIT_RUNLIST;
msg->handle = handle;
p = &msg->params.runlist;
p->runlist_id = runlist_id;
p->num_entries = num_entries;
ptr = (char *)msg + sizeof(*msg);
memcpy(ptr, runlist, sizeof(*runlist) * num_entries);
err = vgpu_comm_sendrecv(msg, size, sizeof(*msg));
err = (err || msg->ret) ? -1 : 0;
kfree(msg);
return err;
}
static int vgpu_fifo_update_runlist_locked(struct gk20a *g, u32 runlist_id,
u32 hw_chid, bool add,
bool wait_for_finish)
{
struct fifo_gk20a *f = &g->fifo;
struct fifo_runlist_info_gk20a *runlist;
u16 *runlist_entry = NULL;
u32 count = 0;
gk20a_dbg_fn("");
runlist = &f->runlist_info[runlist_id];
/* valid channel, add/remove it from active list.
Otherwise, keep active list untouched for suspend/resume. */
if (hw_chid != ~0) {
if (add) {
if (test_and_set_bit(hw_chid,
runlist->active_channels) == 1)
return 0;
} else {
if (test_and_clear_bit(hw_chid,
runlist->active_channels) == 0)
return 0;
}
}
if (hw_chid != ~0 || /* add/remove a valid channel */
add /* resume to add all channels back */) {
u32 chid;
runlist_entry = runlist->mem[0].cpu_va;
for_each_set_bit(chid,
runlist->active_channels, f->num_channels) {
gk20a_dbg_info("add channel %d to runlist", chid);
runlist_entry[0] = chid;
runlist_entry++;
count++;
}
} else /* suspend to remove all channels */
count = 0;
return vgpu_submit_runlist(vgpu_get_handle(g), runlist_id,
runlist->mem[0].cpu_va, count);
}
/* add/remove a channel from runlist
special cases below: runlist->active_channels will NOT be changed.
(hw_chid == ~0 && !add) means remove all active channels from runlist.
(hw_chid == ~0 && add) means restore all active channels on runlist. */
static int vgpu_fifo_update_runlist(struct gk20a *g, u32 runlist_id,
u32 hw_chid, bool add, bool wait_for_finish)
{
struct fifo_runlist_info_gk20a *runlist = NULL;
struct fifo_gk20a *f = &g->fifo;
u32 ret = 0;
gk20a_dbg_fn("");
runlist = &f->runlist_info[runlist_id];
mutex_lock(&runlist->mutex);
ret = vgpu_fifo_update_runlist_locked(g, runlist_id, hw_chid, add,
wait_for_finish);
mutex_unlock(&runlist->mutex);
return ret;
}
static int vgpu_fifo_wait_engine_idle(struct gk20a *g)
{
gk20a_dbg_fn("");
return 0;
}
static int vgpu_channel_set_priority(struct channel_gk20a *ch, u32 priority)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_priority_params *p =
&msg.params.channel_priority;
int err;
gk20a_dbg_info("channel %d set priority %u", ch->hw_chid, priority);
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_SET_PRIORITY;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
p->priority = priority;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
return err ? err : msg.ret;
}
static int vgpu_fifo_tsg_set_runlist_interleave(struct gk20a *g,
u32 tsgid,
u32 runlist_id,
u32 new_level)
{
struct tegra_vgpu_cmd_msg msg = {0};
struct tegra_vgpu_tsg_runlist_interleave_params *p =
&msg.params.tsg_interleave;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_TSG_SET_RUNLIST_INTERLEAVE;
msg.handle = vgpu_get_handle(g);
p->tsg_id = tsgid;
p->level = new_level;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
return err ? err : msg.ret;
}
static int vgpu_fifo_set_runlist_interleave(struct gk20a *g,
u32 id,
bool is_tsg,
u32 runlist_id,
u32 new_level)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_runlist_interleave_params *p =
&msg.params.channel_interleave;
struct channel_gk20a *ch;
int err;
gk20a_dbg_fn("");
if (is_tsg)
return vgpu_fifo_tsg_set_runlist_interleave(g, id,
runlist_id, new_level);
ch = &g->fifo.channel[id];
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_SET_RUNLIST_INTERLEAVE;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
p->level = new_level;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
return err ? err : msg.ret;
}
static int vgpu_channel_set_timeslice(struct channel_gk20a *ch, u32 timeslice)
{
struct tegra_vgpu_cmd_msg msg;
struct tegra_vgpu_channel_timeslice_params *p =
&msg.params.channel_timeslice;
int err;
gk20a_dbg_fn("");
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_SET_TIMESLICE;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
p->timeslice_us = timeslice;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
return err ? err : msg.ret;
}
static int vgpu_fifo_force_reset_ch(struct channel_gk20a *ch,
u32 err_code, bool verbose)
{
struct tsg_gk20a *tsg = NULL;
struct channel_gk20a *ch_tsg = NULL;
struct gk20a *g = ch->g;
struct tegra_vgpu_cmd_msg msg = {0};
struct tegra_vgpu_channel_config_params *p =
&msg.params.channel_config;
int err;
gk20a_dbg_fn("");
if (gk20a_is_channel_marked_as_tsg(ch)) {
tsg = &g->fifo.tsg[ch->tsgid];
mutex_lock(&tsg->ch_list_lock);
list_for_each_entry(ch_tsg, &tsg->ch_list, ch_entry) {
if (gk20a_channel_get(ch_tsg)) {
gk20a_set_error_notifier(ch_tsg, err_code);
ch_tsg->has_timedout = true;
gk20a_channel_put(ch_tsg);
}
}
mutex_unlock(&tsg->ch_list_lock);
} else {
gk20a_set_error_notifier(ch, err_code);
ch->has_timedout = true;
}
msg.cmd = TEGRA_VGPU_CMD_CHANNEL_FORCE_RESET;
msg.handle = vgpu_get_handle(ch->g);
p->handle = ch->virt_ctx;
err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
WARN_ON(err || msg.ret);
return err ? err : msg.ret;
}
static void vgpu_fifo_set_ctx_mmu_error(struct gk20a *g,
struct channel_gk20a *ch)
{
if (ch->error_notifier) {
if (ch->error_notifier->status == 0xffff) {
/* If error code is already set, this mmu fault
* was triggered as part of recovery from other
* error condition.
* Don't overwrite error flag. */
} else {
gk20a_set_error_notifier(ch,
NVGPU_CHANNEL_FIFO_ERROR_MMU_ERR_FLT);
}
}
/* mark channel as faulted */
ch->has_timedout = true;
wmb();
/* unblock pending waits */
wake_up(&ch->semaphore_wq);
wake_up(&ch->notifier_wq);
wake_up(&ch->submit_wq);
}
int vgpu_fifo_isr(struct gk20a *g, struct tegra_vgpu_fifo_intr_info *info)
{
struct fifo_gk20a *f = &g->fifo;
struct channel_gk20a *ch = gk20a_channel_get(&f->channel[info->chid]);
gk20a_dbg_fn("");
if (!ch)
return 0;
gk20a_err(dev_from_gk20a(g), "fifo intr (%d) on ch %u",
info->type, info->chid);
trace_gk20a_channel_reset(ch->hw_chid, ch->tsgid);
switch (info->type) {
case TEGRA_VGPU_FIFO_INTR_PBDMA:
gk20a_set_error_notifier(ch, NVGPU_CHANNEL_PBDMA_ERROR);
break;
case TEGRA_VGPU_FIFO_INTR_CTXSW_TIMEOUT:
gk20a_set_error_notifier(ch,
NVGPU_CHANNEL_FIFO_ERROR_IDLE_TIMEOUT);
break;
case TEGRA_VGPU_FIFO_INTR_MMU_FAULT:
vgpu_fifo_set_ctx_mmu_error(g, ch);
gk20a_channel_abort(ch, false);
break;
default:
WARN_ON(1);
break;
}
gk20a_channel_put(ch);
return 0;
}
int vgpu_fifo_nonstall_isr(struct gk20a *g,
struct tegra_vgpu_fifo_nonstall_intr_info *info)
{
gk20a_dbg_fn("");
switch (info->type) {
case TEGRA_VGPU_FIFO_NONSTALL_INTR_CHANNEL:
gk20a_channel_semaphore_wakeup(g, false);
break;
default:
WARN_ON(1);
break;
}
return 0;
}
void vgpu_init_fifo_ops(struct gpu_ops *gops)
{
gops->fifo.bind_channel = vgpu_channel_bind;
gops->fifo.unbind_channel = vgpu_channel_unbind;
gops->fifo.enable_channel = vgpu_channel_enable;
gops->fifo.disable_channel = vgpu_channel_disable;
gops->fifo.alloc_inst = vgpu_channel_alloc_inst;
gops->fifo.free_inst = vgpu_channel_free_inst;
gops->fifo.setup_ramfc = vgpu_channel_setup_ramfc;
gops->fifo.preempt_channel = vgpu_fifo_preempt_channel;
gops->fifo.preempt_tsg = vgpu_fifo_preempt_tsg;
gops->fifo.update_runlist = vgpu_fifo_update_runlist;
gops->fifo.wait_engine_idle = vgpu_fifo_wait_engine_idle;
gops->fifo.channel_set_priority = vgpu_channel_set_priority;
gops->fifo.set_runlist_interleave = vgpu_fifo_set_runlist_interleave;
gops->fifo.channel_set_timeslice = vgpu_channel_set_timeslice;
gops->fifo.force_reset_ch = vgpu_fifo_force_reset_ch;
gops->fifo.init_engine_info = vgpu_fifo_init_engine_info;
}