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* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* 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 "msgqueue.h"
#include <engine/falcon.h>
#include <subdev/secboot.h>
#define HDR_SIZE sizeof(struct nvkm_msgqueue_hdr)
#define QUEUE_ALIGNMENT 4
/* max size of the messages we can receive */
#define MSG_BUF_SIZE 128
static int
msg_queue_open(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue)
{
struct nvkm_falcon *falcon = priv->falcon;
mutex_lock(&queue->mutex);
queue->position = nvkm_falcon_rd32(falcon, queue->tail_reg);
return 0;
}
static void
msg_queue_close(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue,
bool commit)
{
struct nvkm_falcon *falcon = priv->falcon;
if (commit)
nvkm_falcon_wr32(falcon, queue->tail_reg, queue->position);
mutex_unlock(&queue->mutex);
}
static bool
msg_queue_empty(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue)
{
struct nvkm_falcon *falcon = priv->falcon;
u32 head, tail;
head = nvkm_falcon_rd32(falcon, queue->head_reg);
tail = nvkm_falcon_rd32(falcon, queue->tail_reg);
return head == tail;
}
static int
msg_queue_pop(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue,
void *data, u32 size)
{
struct nvkm_falcon *falcon = priv->falcon;
const struct nvkm_subdev *subdev = priv->falcon->owner;
u32 head, tail, available;
head = nvkm_falcon_rd32(falcon, queue->head_reg);
/* has the buffer looped? */
if (head < queue->position)
queue->position = queue->offset;
tail = queue->position;
available = head - tail;
if (available == 0) {
nvkm_warn(subdev, "no message data available\n");
return 0;
}
if (size > available) {
nvkm_warn(subdev, "message data smaller than read request\n");
size = available;
}
nvkm_falcon_read_dmem(priv->falcon, tail, size, 0, data);
queue->position += ALIGN(size, QUEUE_ALIGNMENT);
return size;
}
static int
msg_queue_read(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue,
struct nvkm_msgqueue_hdr *hdr)
{
const struct nvkm_subdev *subdev = priv->falcon->owner;
int err;
err = msg_queue_open(priv, queue);
if (err) {
nvkm_error(subdev, "fail to open queue %d\n", queue->index);
return err;
}
if (msg_queue_empty(priv, queue)) {
err = 0;
goto close;
}
err = msg_queue_pop(priv, queue, hdr, HDR_SIZE);
if (err >= 0 && err != HDR_SIZE)
err = -EINVAL;
if (err < 0) {
nvkm_error(subdev, "failed to read message header: %d\n", err);
goto close;
}
if (hdr->size > MSG_BUF_SIZE) {
nvkm_error(subdev, "message too big (%d bytes)\n", hdr->size);
err = -ENOSPC;
goto close;
}
if (hdr->size > HDR_SIZE) {
u32 read_size = hdr->size - HDR_SIZE;
err = msg_queue_pop(priv, queue, (hdr + 1), read_size);
if (err >= 0 && err != read_size)
err = -EINVAL;
if (err < 0) {
nvkm_error(subdev, "failed to read message: %d\n", err);
goto close;
}
}
close:
msg_queue_close(priv, queue, (err >= 0));
return err;
}
static bool
cmd_queue_has_room(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue,
u32 size, bool *rewind)
{
struct nvkm_falcon *falcon = priv->falcon;
u32 head, tail, free;
size = ALIGN(size, QUEUE_ALIGNMENT);
head = nvkm_falcon_rd32(falcon, queue->head_reg);
tail = nvkm_falcon_rd32(falcon, queue->tail_reg);
if (head >= tail) {
free = queue->offset + queue->size - head;
free -= HDR_SIZE;
if (size > free) {
*rewind = true;
head = queue->offset;
}
}
if (head < tail)
free = tail - head - 1;
return size <= free;
}
static int
cmd_queue_push(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue,
void *data, u32 size)
{
nvkm_falcon_load_dmem(priv->falcon, data, queue->position, size, 0);
queue->position += ALIGN(size, QUEUE_ALIGNMENT);
return 0;
}
/* REWIND unit is always 0x00 */
#define MSGQUEUE_UNIT_REWIND 0x00
static void
cmd_queue_rewind(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue)
{
const struct nvkm_subdev *subdev = priv->falcon->owner;
struct nvkm_msgqueue_hdr cmd;
int err;
cmd.unit_id = MSGQUEUE_UNIT_REWIND;
cmd.size = sizeof(cmd);
err = cmd_queue_push(priv, queue, &cmd, cmd.size);
if (err)
nvkm_error(subdev, "queue %d rewind failed\n", queue->index);
else
nvkm_error(subdev, "queue %d rewinded\n", queue->index);
queue->position = queue->offset;
}
static int
cmd_queue_open(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue,
u32 size)
{
struct nvkm_falcon *falcon = priv->falcon;
const struct nvkm_subdev *subdev = priv->falcon->owner;
bool rewind = false;
mutex_lock(&queue->mutex);
if (!cmd_queue_has_room(priv, queue, size, &rewind)) {
nvkm_error(subdev, "queue full\n");
mutex_unlock(&queue->mutex);
return -EAGAIN;
}
queue->position = nvkm_falcon_rd32(falcon, queue->head_reg);
if (rewind)
cmd_queue_rewind(priv, queue);
return 0;
}
static void
cmd_queue_close(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_queue *queue,
bool commit)
{
struct nvkm_falcon *falcon = priv->falcon;
if (commit)
nvkm_falcon_wr32(falcon, queue->head_reg, queue->position);
mutex_unlock(&queue->mutex);
}
static int
cmd_write(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_hdr *cmd,
struct nvkm_msgqueue_queue *queue)
{
const struct nvkm_subdev *subdev = priv->falcon->owner;
static unsigned timeout = 2000;
unsigned long end_jiffies = jiffies + msecs_to_jiffies(timeout);
int ret = -EAGAIN;
bool commit = true;
while (ret == -EAGAIN && time_before(jiffies, end_jiffies))
ret = cmd_queue_open(priv, queue, cmd->size);
if (ret) {
nvkm_error(subdev, "pmu_queue_open_write failed\n");
return ret;
}
ret = cmd_queue_push(priv, queue, cmd, cmd->size);
if (ret) {
nvkm_error(subdev, "pmu_queue_push failed\n");
commit = false;
}
cmd_queue_close(priv, queue, commit);
return ret;
}
static struct nvkm_msgqueue_seq *
msgqueue_seq_acquire(struct nvkm_msgqueue *priv)
{
const struct nvkm_subdev *subdev = priv->falcon->owner;
struct nvkm_msgqueue_seq *seq;
u32 index;
mutex_lock(&priv->seq_lock);
index = find_first_zero_bit(priv->seq_tbl, NVKM_MSGQUEUE_NUM_SEQUENCES);
if (index >= NVKM_MSGQUEUE_NUM_SEQUENCES) {
nvkm_error(subdev, "no free sequence available\n");
mutex_unlock(&priv->seq_lock);
return ERR_PTR(-EAGAIN);
}
set_bit(index, priv->seq_tbl);
mutex_unlock(&priv->seq_lock);
seq = &priv->seq[index];
seq->state = SEQ_STATE_PENDING;
return seq;
}
static void
msgqueue_seq_release(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_seq *seq)
{
/* no need to acquire seq_lock since clear_bit is atomic */
seq->state = SEQ_STATE_FREE;
seq->callback = NULL;
seq->completion = NULL;
clear_bit(seq->id, priv->seq_tbl);
}
/* specifies that we want to know the command status in the answer message */
#define CMD_FLAGS_STATUS BIT(0)
/* specifies that we want an interrupt when the answer message is queued */
#define CMD_FLAGS_INTR BIT(1)
int
nvkm_msgqueue_post(struct nvkm_msgqueue *priv, enum msgqueue_msg_priority prio,
struct nvkm_msgqueue_hdr *cmd, nvkm_msgqueue_callback cb,
struct completion *completion, bool wait_init)
{
struct nvkm_msgqueue_seq *seq;
struct nvkm_msgqueue_queue *queue;
int ret;
if (wait_init && !wait_for_completion_timeout(&priv->init_done,
msecs_to_jiffies(1000)))
return -ETIMEDOUT;
queue = priv->func->cmd_queue(priv, prio);
if (IS_ERR(queue))
return PTR_ERR(queue);
seq = msgqueue_seq_acquire(priv);
if (IS_ERR(seq))
return PTR_ERR(seq);
cmd->seq_id = seq->id;
cmd->ctrl_flags = CMD_FLAGS_STATUS | CMD_FLAGS_INTR;
seq->callback = cb;
seq->state = SEQ_STATE_USED;
seq->completion = completion;
ret = cmd_write(priv, cmd, queue);
if (ret) {
seq->state = SEQ_STATE_PENDING;
msgqueue_seq_release(priv, seq);
}
return ret;
}
static int
msgqueue_msg_handle(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_hdr *hdr)
{
const struct nvkm_subdev *subdev = priv->falcon->owner;
struct nvkm_msgqueue_seq *seq;
seq = &priv->seq[hdr->seq_id];
if (seq->state != SEQ_STATE_USED && seq->state != SEQ_STATE_CANCELLED) {
nvkm_error(subdev, "msg for unknown sequence %d", seq->id);
return -EINVAL;
}
if (seq->state == SEQ_STATE_USED) {
if (seq->callback)
seq->callback(priv, hdr);
}
if (seq->completion)
complete(seq->completion);
msgqueue_seq_release(priv, seq);
return 0;
}
static int
msgqueue_handle_init_msg(struct nvkm_msgqueue *priv,
struct nvkm_msgqueue_hdr *hdr)
{
struct nvkm_falcon *falcon = priv->falcon;
const struct nvkm_subdev *subdev = falcon->owner;
u32 tail;
u32 tail_reg;
int ret;
/*
* Of course the message queue registers vary depending on the falcon
* used...
*/
switch (falcon->owner->index) {
case NVKM_SUBDEV_PMU:
tail_reg = 0x4cc;
break;
case NVKM_ENGINE_SEC2:
tail_reg = 0xa34;
break;
default:
nvkm_error(subdev, "falcon %s unsupported for msgqueue!\n",
nvkm_subdev_name[falcon->owner->index]);
return -EINVAL;
}
/*
* Read the message - queues are not initialized yet so we cannot rely
* on msg_queue_read()
*/
tail = nvkm_falcon_rd32(falcon, tail_reg);
nvkm_falcon_read_dmem(falcon, tail, HDR_SIZE, 0, hdr);
if (hdr->size > MSG_BUF_SIZE) {
nvkm_error(subdev, "message too big (%d bytes)\n", hdr->size);
return -ENOSPC;
}
nvkm_falcon_read_dmem(falcon, tail + HDR_SIZE, hdr->size - HDR_SIZE, 0,
(hdr + 1));
tail += ALIGN(hdr->size, QUEUE_ALIGNMENT);
nvkm_falcon_wr32(falcon, tail_reg, tail);
ret = priv->func->init_func->init_callback(priv, hdr);
if (ret)
return ret;
return 0;
}
void
nvkm_msgqueue_process_msgs(struct nvkm_msgqueue *priv,
struct nvkm_msgqueue_queue *queue)
{
/*
* We are invoked from a worker thread, so normally we have plenty of
* stack space to work with.
*/
u8 msg_buffer[MSG_BUF_SIZE];
struct nvkm_msgqueue_hdr *hdr = (void *)msg_buffer;
int ret;
/* the first message we receive must be the init message */
if ((!priv->init_msg_received)) {
ret = msgqueue_handle_init_msg(priv, hdr);
if (!ret)
priv->init_msg_received = true;
} else {
while (msg_queue_read(priv, queue, hdr) > 0)
msgqueue_msg_handle(priv, hdr);
}
}
void
nvkm_msgqueue_write_cmdline(struct nvkm_msgqueue *queue, void *buf)
{
if (!queue || !queue->func || !queue->func->init_func)
return;
queue->func->init_func->gen_cmdline(queue, buf);
}
int
nvkm_msgqueue_acr_boot_falcons(struct nvkm_msgqueue *queue,
unsigned long falcon_mask)
{
unsigned long falcon;
if (!queue || !queue->func->acr_func)
return -ENODEV;
/* Does the firmware support booting multiple falcons? */
if (queue->func->acr_func->boot_multiple_falcons)
return queue->func->acr_func->boot_multiple_falcons(queue,
falcon_mask);
/* Else boot all requested falcons individually */
if (!queue->func->acr_func->boot_falcon)
return -ENODEV;
for_each_set_bit(falcon, &falcon_mask, NVKM_SECBOOT_FALCON_END) {
int ret = queue->func->acr_func->boot_falcon(queue, falcon);
if (ret)
return ret;
}
return 0;
}
int
nvkm_msgqueue_new(u32 version, struct nvkm_falcon *falcon,
const struct nvkm_secboot *sb, struct nvkm_msgqueue **queue)
{
const struct nvkm_subdev *subdev = falcon->owner;
int ret = -EINVAL;
switch (version) {
case 0x0137c63d:
ret = msgqueue_0137c63d_new(falcon, sb, queue);
break;
case 0x0137bca5:
ret = msgqueue_0137bca5_new(falcon, sb, queue);
break;
case 0x0148cdec:
ret = msgqueue_0148cdec_new(falcon, sb, queue);
break;
default:
nvkm_error(subdev, "unhandled firmware version 0x%08x\n",
version);
break;
}
if (ret == 0) {
nvkm_debug(subdev, "firmware version: 0x%08x\n", version);
(*queue)->fw_version = version;
}
return ret;
}
void
nvkm_msgqueue_del(struct nvkm_msgqueue **queue)
{
if (*queue) {
(*queue)->func->dtor(*queue);
*queue = NULL;
}
}
void
nvkm_msgqueue_recv(struct nvkm_msgqueue *queue)
{
if (!queue->func || !queue->func->recv) {
const struct nvkm_subdev *subdev = queue->falcon->owner;
nvkm_warn(subdev, "missing msgqueue recv function\n");
return;
}
queue->func->recv(queue);
}
int
nvkm_msgqueue_reinit(struct nvkm_msgqueue *queue)
{
/* firmware not set yet... */
if (!queue)
return 0;
queue->init_msg_received = false;
reinit_completion(&queue->init_done);
return 0;
}
void
nvkm_msgqueue_ctor(const struct nvkm_msgqueue_func *func,
struct nvkm_falcon *falcon,
struct nvkm_msgqueue *queue)
{
int i;
queue->func = func;
queue->falcon = falcon;
mutex_init(&queue->seq_lock);
for (i = 0; i < NVKM_MSGQUEUE_NUM_SEQUENCES; i++)
queue->seq[i].id = i;
init_completion(&queue->init_done);
}
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