Other Firmware Interfaces¶

DMI Interfaces¶

int dmi_check_system(const struct dmi_system_id * list)¶: check system DMI data

Parameters

const struct dmi_system_id * list: array of dmi_system_id structures to match against All non-null elements of the list must match their slot’s (field index’s) data (i.e., each list string must be a substring of the specified DMI slot’s string data) to be considered a successful match.

Description

Walk the blacklist table running matching functions until someone returns non zero or we hit the end. Callback function is called for each successful match. Returns the number of matches.

dmi_setup must be called before this function is called.

const struct dmi_system_id * dmi_first_match(const struct dmi_system_id * list)¶: find dmi_system_id structure matching system DMI data

Parameters

const struct dmi_system_id * list: array of dmi_system_id structures to match against All non-null elements of the list must match their slot’s (field index’s) data (i.e., each list string must be a substring of the specified DMI slot’s string data) to be considered a successful match.

Description

Walk the blacklist table until the first match is found. Return the pointer to the matching entry or NULL if there’s no match.

dmi_setup must be called before this function is called.

const char * dmi_get_system_info(int field)¶: return DMI data value

Parameters

int field: data index (see enum dmi_field)

Description

Returns one DMI data value, can be used to perform complex DMI data checks.

int dmi_name_in_vendors(const char * str)¶: Check if string is in the DMI system or board vendor name

Parameters

const char * str: Case sensitive Name

const struct dmi_device * dmi_find_device(int type, const char * name, const struct dmi_device * from)¶: find onboard device by type/name

Parameters

int type: device type or DMI_DEV_TYPE_ANY to match all device types
const char * name: device name string or NULL to match all
const struct dmi_device * from: previous device found in search, or NULL for new search.

Description

Iterates through the list of known onboard devices. If a device is found with a matching type and name, a pointer to its device structure is returned. Otherwise, NULL is returned. A new search is initiated by passing NULL as the from argument. If from is not NULL, searches continue from next device.

bool dmi_get_date(int field, int * yearp, int * monthp, int * dayp)¶: parse a DMI date

Parameters

int field: data index (see enum dmi_field)
int * yearp: optional out parameter for the year
int * monthp: optional out parameter for the month
int * dayp: optional out parameter for the day

Description

The date field is assumed to be in the form resembling [mm[/dd]]/yy[yy] and the result is stored in the out parameters any or all of which can be omitted.

If the field doesn’t exist, all out parameters are set to zero and false is returned. Otherwise, true is returned with any invalid part of date set to zero.

On return, year, month and day are guaranteed to be in the range of [0,9999], [0,12] and [0,31] respectively.

int dmi_get_bios_year(void)¶: get a year out of DMI_BIOS_DATE field

Parameters

void: no arguments

Description

Returns year on success, -ENXIO if DMI is not selected, or a different negative error code if DMI field is not present or not parseable.

int dmi_walk(void (*decode) (const struct dmi_header *, void *, void * private_data)¶: Walk the DMI table and get called back for every record

Parameters

void (*)(const struct dmi_header *, void *) decode: Callback function
void * private_data: Private data to be passed to the callback function

Description

Returns 0 on success, -ENXIO if DMI is not selected or not present, or a different negative error code if DMI walking fails.

bool dmi_match(enum dmi_field f, const char * str)¶: compare a string to the dmi field (if exists)

Parameters

enum dmi_field f: DMI field identifier
const char * str: string to compare the DMI field to

Description

Returns true if the requested field equals to the str (including NULL).

EDD Interfaces¶

ssize_t edd_show_raw_data(struct edd_device * edev, char * buf)¶: copies raw data to buffer for userspace to parse

Parameters

struct edd_device * edev: target edd_device
char * buf: output buffer

Return

number of bytes written, or -EINVAL on failure

void edd_release(struct kobject * kobj)¶: free edd structure

Parameters

struct kobject * kobj: kobject of edd structure

Description

This is called when the refcount of the edd structure reaches 0. This should happen right after we unregister, but just in case, we use the release callback anyway.

int edd_dev_is_type(struct edd_device * edev, const char * type)¶: is this EDD device a ‘type’ device?

Parameters

struct edd_device * edev: target edd_device
const char * type: a host bus or interface identifier string per the EDD spec

Description

Returns 1 (TRUE) if it is a ‘type’ device, 0 otherwise.

struct pci_dev * edd_get_pci_dev(struct edd_device * edev)¶: finds pci_dev that matches edev

Parameters

struct edd_device * edev: edd_device

Description

Returns pci_dev if found, or NULL

int edd_init(void)¶: creates sysfs tree of EDD data

Parameters

void: no arguments

Intel Stratix10 SoC Service Layer¶

Some features of the Intel Stratix10 SoC require a level of privilege higher than the kernel is granted. Such secure features include FPGA programming. In terms of the ARMv8 architecture, the kernel runs at Exception Level 1 (EL1), access to the features requires Exception Level 3 (EL3).

The Intel Stratix10 SoC service layer provides an in kernel API for drivers to request access to the secure features. The requests are queued and processed one by one. ARM’s SMCCC is used to pass the execution of the requests on to a secure monitor (EL3).

enum stratix10_svc_command_code¶: supported service commands

Constants

COMMAND_NOOP: do ‘dummy’ request for integration/debug/trouble-shooting
COMMAND_RECONFIG: ask for FPGA configuration preparation, return status is SVC_STATUS_RECONFIG_REQUEST_OK
COMMAND_RECONFIG_DATA_SUBMIT: submit buffer(s) of bit-stream data for the FPGA configuration, return status is SVC_STATUS_RECONFIG_BUFFER_SUBMITTED, or SVC_STATUS_RECONFIG_ERROR
COMMAND_RECONFIG_DATA_CLAIM: check the status of the configuration, return status is SVC_STATUS_RECONFIG_COMPLETED, or SVC_STATUS_RECONFIG_BUSY, or SVC_STATUS_RECONFIG_ERROR
COMMAND_RECONFIG_STATUS: check the status of the configuration, return status is SVC_STATUS_RECONFIG_COMPLETED, or SVC_STATUS_RECONFIG_BUSY, or SVC_STATUS_RECONFIG_ERROR
COMMAND_RSU_STATUS: request remote system update boot log, return status is log data or SVC_STATUS_RSU_ERROR
COMMAND_RSU_UPDATE: set the offset of the bitstream to boot after reboot, return status is SVC_STATUS_RSU_OK or SVC_STATUS_RSU_ERROR

struct stratix10_svc_client_msg¶: message sent by client to service

Definition

struct stratix10_svc_client_msg {
  void *payload;
  size_t payload_length;
  enum stratix10_svc_command_code command;
  u64 arg[3];
};

Members

payload: starting address of data need be processed
payload_length: data size in bytes
command: service command
arg: args to be passed via registers and not physically mapped buffers

struct stratix10_svc_command_config_type¶: config type

Definition

struct stratix10_svc_command_config_type {
  u32 flags;
};

Members

flags: flag bit for the type of FPGA configuration

struct stratix10_svc_cb_data¶: callback data structure from service layer

Definition

struct stratix10_svc_cb_data {
  u32 status;
  void *kaddr1;
  void *kaddr2;
  void *kaddr3;
};

Members

status: the status of sent command
kaddr1: address of 1st completed data block
kaddr2: address of 2nd completed data block
kaddr3: address of 3rd completed data block

struct stratix10_svc_client¶: service client structure

Definition

struct stratix10_svc_client {
  struct device *dev;
  void (*receive_cb)(struct stratix10_svc_client *client, struct stratix10_svc_cb_data *cb_data);
  void *priv;
};

Members

dev: the client device
receive_cb: callback to provide service client the received data
priv: client private data

struct stratix10_svc_chan * stratix10_svc_request_channel_byname(struct stratix10_svc_client * client, const char * name)¶: request a service channel

Parameters

struct stratix10_svc_client * client: pointer to service client
const char * name: service client name

Description

This function is used by service client to request a service channel.

Return

a pointer to channel assigned to the client on success, or ERR_PTR() on error.

void stratix10_svc_free_channel(struct stratix10_svc_chan * chan)¶: free service channel

Parameters

struct stratix10_svc_chan * chan: service channel to be freed

Description

This function is used by service client to free a service channel.

int stratix10_svc_send(struct stratix10_svc_chan * chan, void * msg)¶: send a message data to the remote

Parameters

struct stratix10_svc_chan * chan: service channel assigned to the client
void * msg: message data to be sent, in the format of “struct stratix10_svc_client_msg”

Description

This function is used by service client to add a message to the service layer driver’s queue for being sent to the secure world.

Return

0 for success, -ENOMEM or -ENOBUFS on error.

void stratix10_svc_done(struct stratix10_svc_chan * chan)¶: complete service request transactions

Parameters

struct stratix10_svc_chan * chan: service channel assigned to the client

Description

This function should be called when client has finished its request or there is an error in the request process. It allows the service layer to stop the running thread to have maximize savings in kernel resources.

void * stratix10_svc_allocate_memory(struct stratix10_svc_chan * chan, size_t size)¶: allocate memory

Parameters

struct stratix10_svc_chan * chan: service channel assigned to the client
size_t size: memory size requested by a specific service client

Description

Service layer allocates the requested number of bytes buffer from the memory pool, service client uses this function to get allocated buffers.

Return

address of allocated memory on success, or ERR_PTR() on error.

void stratix10_svc_free_memory(struct stratix10_svc_chan * chan, void * kaddr)¶: free allocated memory

Parameters

struct stratix10_svc_chan * chan: service channel assigned to the client
void * kaddr: memory to be freed

Description

This function is used by service client to free allocated buffers.