firmware: add Intel Stratix10 remote system update driver (4526ebbc) · Commits · 戴 / test

drivers/firmware/Kconfig

+18 −0

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		@@ -216,6 +216,24 @@ config INTEL_STRATIX10_SERVICE

		Say Y here if you want Stratix10 service layer support.

		config INTEL_STRATIX10_RSU
		tristate "Intel Stratix10 Remote System Update"
		depends on INTEL_STRATIX10_SERVICE
		help
		The Intel Remote System Update (RSU) driver exposes interfaces
		access through the Intel Service Layer to user space via sysfs
		device attribute nodes. The RSU interfaces report/control some of
		the optional RSU features of the Stratix 10 SoC FPGA.

		The RSU provides a way for customers to update the boot
		configuration of a Stratix 10 SoC device with significantly reduced
		risk of corrupting the bitstream storage and bricking the system.

		Enable RSU support if you are using an Intel SoC FPGA with the RSU
		feature enabled and you want Linux user space control.

		Say Y here if you want Intel RSU support.

		config QCOM_SCM
		bool
		depends on ARM \|\| ARM64

drivers/firmware/Makefile

+1 −0

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		@@ -11,6 +11,7 @@ obj-$(CONFIG_EDD) += edd.o
		obj-$(CONFIG_EFI_PCDP) += pcdp.o
		obj-$(CONFIG_DMIID) += dmi-id.o
		obj-$(CONFIG_INTEL_STRATIX10_SERVICE) += stratix10-svc.o
		obj-$(CONFIG_INTEL_STRATIX10_RSU) += stratix10-rsu.o
		obj-$(CONFIG_ISCSI_IBFT_FIND) += iscsi_ibft_find.o
		obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
		obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o

drivers/firmware/stratix10-rsu.c

0 → 100644

+451 −0

Original line number	Diff line number	Diff line
		// 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_FW_VERSION_MASK GENMASK_ULL(15, 0)

		#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_RSU_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_RSU_OK))
		dev_err(client->dev, "RSU returned status is %i\n",
		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_RSU_OK))
		priv->retry_counter = *counter;
		else
		dev_err(client->dev, "Failed to get retry counter %i\n",
		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;
		}

		/* only 19.3 or late version FW supports retry counter feature */
		if (FIELD_GET(RSU_FW_VERSION_MASK, priv->status.version)) {
		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);
		}

		/* only 19.3 or late version FW supports retry counter feature */
		if (FIELD_GET(RSU_FW_VERSION_MASK, priv->status.version)) {
		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>");

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