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linux/drivers/firmware/stratix10-rsu.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018-2019, Intel Corporation
*/
#include <linux/arm-smccc.h>
#include <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/firmware/intel/stratix10-svc-client.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#define RSU_STATE_MASK GENMASK_ULL(31, 0)
#define RSU_VERSION_MASK GENMASK_ULL(63, 32)
#define RSU_ERROR_LOCATION_MASK GENMASK_ULL(31, 0)
#define RSU_ERROR_DETAIL_MASK GENMASK_ULL(63, 32)
#define RSU_TIMEOUT (msecs_to_jiffies(SVC_RSU_REQUEST_TIMEOUT_MS))
#define INVALID_RETRY_COUNTER 0xFFFFFFFF
typedef void (*rsu_callback)(struct stratix10_svc_client *client,
struct stratix10_svc_cb_data *data);
/**
* struct stratix10_rsu_priv - rsu data structure
* @chan: pointer to the allocated service channel
* @client: active service client
* @completion: state for callback completion
* @lock: a mutex to protect callback completion state
* @status.current_image: address of image currently running in flash
* @status.fail_image: address of failed image in flash
* @status.version: the version number of RSU firmware
* @status.state: the state of RSU system
* @status.error_details: error code
* @status.error_location: the error offset inside the image that failed
* @retry_counter: the current image's retry counter
*/
struct stratix10_rsu_priv {
struct stratix10_svc_chan *chan;
struct stratix10_svc_client client;
struct completion completion;
struct mutex lock;
struct {
unsigned long current_image;
unsigned long fail_image;
unsigned int version;
unsigned int state;
unsigned int error_details;
unsigned int error_location;
} status;
unsigned int retry_counter;
};
/**
* rsu_status_callback() - Status callback from Intel Service Layer
* @client: pointer to service client
* @data: pointer to callback data structure
*
* Callback from Intel service layer for RSU status request. Status is
* only updated after a system reboot, so a get updated status call is
* made during driver probe.
*/
static void rsu_status_callback(struct stratix10_svc_client *client,
struct stratix10_svc_cb_data *data)
{
struct stratix10_rsu_priv *priv = client->priv;
struct arm_smccc_res *res = (struct arm_smccc_res *)data->kaddr1;
if (data->status == BIT(SVC_STATUS_OK)) {
priv->status.version = FIELD_GET(RSU_VERSION_MASK,
res->a2);
priv->status.state = FIELD_GET(RSU_STATE_MASK, res->a2);
priv->status.fail_image = res->a1;
priv->status.current_image = res->a0;
priv->status.error_location =
FIELD_GET(RSU_ERROR_LOCATION_MASK, res->a3);
priv->status.error_details =
FIELD_GET(RSU_ERROR_DETAIL_MASK, res->a3);
} else {
dev_err(client->dev, "COMMAND_RSU_STATUS returned 0x%lX\n",
res->a0);
priv->status.version = 0;
priv->status.state = 0;
priv->status.fail_image = 0;
priv->status.current_image = 0;
priv->status.error_location = 0;
priv->status.error_details = 0;
}
complete(&priv->completion);
}
/**
* rsu_command_callback() - Update callback from Intel Service Layer
* @client: pointer to client
* @data: pointer to callback data structure
*
* Callback from Intel service layer for RSU commands.
*/
static void rsu_command_callback(struct stratix10_svc_client *client,
struct stratix10_svc_cb_data *data)
{
struct stratix10_rsu_priv *priv = client->priv;
if (data->status == BIT(SVC_STATUS_NO_SUPPORT))
dev_warn(client->dev, "Secure FW doesn't support notify\n");
else if (data->status == BIT(SVC_STATUS_ERROR))
dev_err(client->dev, "Failure, returned status is %lu\n",
BIT(data->status));
complete(&priv->completion);
}
/**
* rsu_retry_callback() - Callback from Intel service layer for getting
* the current image's retry counter from firmware
* @client: pointer to client
* @data: pointer to callback data structure
*
* Callback from Intel service layer for retry counter, which is used by
* user to know how many times the images is still allowed to reload
* itself before giving up and starting RSU fail-over flow.
*/
static void rsu_retry_callback(struct stratix10_svc_client *client,
struct stratix10_svc_cb_data *data)
{
struct stratix10_rsu_priv *priv = client->priv;
unsigned int *counter = (unsigned int *)data->kaddr1;
if (data->status == BIT(SVC_STATUS_OK))
priv->retry_counter = *counter;
else if (data->status == BIT(SVC_STATUS_NO_SUPPORT))
dev_warn(client->dev, "Secure FW doesn't support retry\n");
else
dev_err(client->dev, "Failed to get retry counter %lu\n",
BIT(data->status));
complete(&priv->completion);
}
/**
* rsu_send_msg() - send a message to Intel service layer
* @priv: pointer to rsu private data
* @command: RSU status or update command
* @arg: the request argument, the bitstream address or notify status
* @callback: function pointer for the callback (status or update)
*
* Start an Intel service layer transaction to perform the SMC call that
* is necessary to get RSU boot log or set the address of bitstream to
* boot after reboot.
*
* Returns 0 on success or -ETIMEDOUT on error.
*/
static int rsu_send_msg(struct stratix10_rsu_priv *priv,
enum stratix10_svc_command_code command,
unsigned long arg,
rsu_callback callback)
{
struct stratix10_svc_client_msg msg;
int ret;
mutex_lock(&priv->lock);
reinit_completion(&priv->completion);
priv->client.receive_cb = callback;
msg.command = command;
if (arg)
msg.arg[0] = arg;
ret = stratix10_svc_send(priv->chan, &msg);
if (ret < 0)
goto status_done;
ret = wait_for_completion_interruptible_timeout(&priv->completion,
RSU_TIMEOUT);
if (!ret) {
dev_err(priv->client.dev,
"timeout waiting for SMC call\n");
ret = -ETIMEDOUT;
goto status_done;
} else if (ret < 0) {
dev_err(priv->client.dev,
"error %d waiting for SMC call\n", ret);
goto status_done;
} else {
ret = 0;
}
status_done:
stratix10_svc_done(priv->chan);
mutex_unlock(&priv->lock);
return ret;
}
/*
* This driver exposes some optional features of the Intel Stratix 10 SoC FPGA.
* The sysfs interfaces exposed here are FPGA Remote System Update (RSU)
* related. They allow user space software to query the configuration system
* status and to request optional reboot behavior specific to Intel FPGAs.
*/
static ssize_t current_image_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
if (!priv)
return -ENODEV;
return sprintf(buf, "0x%08lx\n", priv->status.current_image);
}
static ssize_t fail_image_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
if (!priv)
return -ENODEV;
return sprintf(buf, "0x%08lx\n", priv->status.fail_image);
}
static ssize_t version_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
if (!priv)
return -ENODEV;
return sprintf(buf, "0x%08x\n", priv->status.version);
}
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
if (!priv)
return -ENODEV;
return sprintf(buf, "0x%08x\n", priv->status.state);
}
static ssize_t error_location_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
if (!priv)
return -ENODEV;
return sprintf(buf, "0x%08x\n", priv->status.error_location);
}
static ssize_t error_details_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
if (!priv)
return -ENODEV;
return sprintf(buf, "0x%08x\n", priv->status.error_details);
}
static ssize_t retry_counter_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
if (!priv)
return -ENODEV;
return sprintf(buf, "0x%08x\n", priv->retry_counter);
}
static ssize_t reboot_image_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
unsigned long address;
int ret;
if (priv == 0)
return -ENODEV;
ret = kstrtoul(buf, 0, &address);
if (ret)
return ret;
ret = rsu_send_msg(priv, COMMAND_RSU_UPDATE,
address, rsu_command_callback);
if (ret) {
dev_err(dev, "Error, RSU update returned %i\n", ret);
return ret;
}
return count;
}
static ssize_t notify_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
unsigned long status;
int ret;
if (priv == 0)
return -ENODEV;
ret = kstrtoul(buf, 0, &status);
if (ret)
return ret;
ret = rsu_send_msg(priv, COMMAND_RSU_NOTIFY,
status, rsu_command_callback);
if (ret) {
dev_err(dev, "Error, RSU notify returned %i\n", ret);
return ret;
}
/* to get the updated state */
ret = rsu_send_msg(priv, COMMAND_RSU_STATUS,
0, rsu_status_callback);
if (ret) {
dev_err(dev, "Error, getting RSU status %i\n", ret);
return ret;
}
ret = rsu_send_msg(priv, COMMAND_RSU_RETRY, 0, rsu_retry_callback);
if (ret) {
dev_err(dev, "Error, getting RSU retry %i\n", ret);
return ret;
}
return count;
}
static DEVICE_ATTR_RO(current_image);
static DEVICE_ATTR_RO(fail_image);
static DEVICE_ATTR_RO(state);
static DEVICE_ATTR_RO(version);
static DEVICE_ATTR_RO(error_location);
static DEVICE_ATTR_RO(error_details);
static DEVICE_ATTR_RO(retry_counter);
static DEVICE_ATTR_WO(reboot_image);
static DEVICE_ATTR_WO(notify);
static struct attribute *rsu_attrs[] = {
&dev_attr_current_image.attr,
&dev_attr_fail_image.attr,
&dev_attr_state.attr,
&dev_attr_version.attr,
&dev_attr_error_location.attr,
&dev_attr_error_details.attr,
&dev_attr_retry_counter.attr,
&dev_attr_reboot_image.attr,
&dev_attr_notify.attr,
NULL
};
ATTRIBUTE_GROUPS(rsu);
static int stratix10_rsu_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct stratix10_rsu_priv *priv;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->client.dev = dev;
priv->client.receive_cb = NULL;
priv->client.priv = priv;
priv->status.current_image = 0;
priv->status.fail_image = 0;
priv->status.error_location = 0;
priv->status.error_details = 0;
priv->status.version = 0;
priv->status.state = 0;
priv->retry_counter = INVALID_RETRY_COUNTER;
mutex_init(&priv->lock);
priv->chan = stratix10_svc_request_channel_byname(&priv->client,
SVC_CLIENT_RSU);
if (IS_ERR(priv->chan)) {
dev_err(dev, "couldn't get service channel %s\n",
SVC_CLIENT_RSU);
return PTR_ERR(priv->chan);
}
init_completion(&priv->completion);
platform_set_drvdata(pdev, priv);
/* get the initial state from firmware */
ret = rsu_send_msg(priv, COMMAND_RSU_STATUS,
0, rsu_status_callback);
if (ret) {
dev_err(dev, "Error, getting RSU status %i\n", ret);
stratix10_svc_free_channel(priv->chan);
}
ret = rsu_send_msg(priv, COMMAND_RSU_RETRY, 0, rsu_retry_callback);
if (ret) {
dev_err(dev, "Error, getting RSU retry %i\n", ret);
stratix10_svc_free_channel(priv->chan);
}
return ret;
}
static int stratix10_rsu_remove(struct platform_device *pdev)
{
struct stratix10_rsu_priv *priv = platform_get_drvdata(pdev);
stratix10_svc_free_channel(priv->chan);
return 0;
}
static struct platform_driver stratix10_rsu_driver = {
.probe = stratix10_rsu_probe,
.remove = stratix10_rsu_remove,
.driver = {
.name = "stratix10-rsu",
.dev_groups = rsu_groups,
},
};
module_platform_driver(stratix10_rsu_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel Remote System Update Driver");
MODULE_AUTHOR("Richard Gong <richard.gong@intel.com>");