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.

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.

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)

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.

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

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 (*decode)(const struct dmi_header *, void *)

Callback function

void *private_data

Private data to be passed to the callback function

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).

u8 dmi_memdev_type(u16 handle)

get the memory type

Parameters

u16 handle

DMI structure handle

Description

Return the DMI memory type of the module in the slot associated with the given DMI handle, or 0x0 if no such DMI handle exists.

u16 dmi_memdev_handle(int slot)

get the DMI handle of a memory slot

Parameters

int slot

slot number

Return the DMI handle associated with a given memory slot, or 0xFFFF if there is no such slot.

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

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

Generic System Framebuffers Interface

void sysfb_disable(struct device *dev)

disable the Generic System Framebuffers support

Parameters

struct device *dev

the device to check if non-NULL

Description

This disables the registration of system framebuffer devices that match the generic drivers that make use of the system framebuffer set up by firmware.

It also unregisters a device if this was already registered by sysfb_init().

Context

The function can sleep. A disable_lock mutex is acquired to serialize against sysfb_init(), that registers a system framebuffer device.

bool sysfb_handles_screen_info(void)

reports if sysfb handles the global screen_info

Parameters

void

no arguments

Description

Callers can use sysfb_handles_screen_info() to determine whether the Generic System Framebuffers (sysfb) can handle the global screen_info data structure or not. Drivers might need this information to know if they have to setup the system framebuffer, or if they have to delegate this action to sysfb instead.

Return

True if sysfb handles the global screen_info data structure.

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_OK

COMMAND_RECONFIG_DATA_SUBMIT

submit buffer(s) of bit-stream data for the FPGA configuration, return status is SVC_STATUS_SUBMITTED or SVC_STATUS_ERROR

COMMAND_RECONFIG_DATA_CLAIM

check the status of the configuration, return status is SVC_STATUS_COMPLETED, or SVC_STATUS_BUSY, or SVC_STATUS_ERROR

COMMAND_RECONFIG_STATUS

check the status of the configuration, return status is SVC_STATUS_COMPLETED, or SVC_STATUS_BUSY, or SVC_STATUS_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_OK or SVC_STATUS_ERROR

COMMAND_RSU_NOTIFY

report the status of hard processor system software to firmware, return status is SVC_STATUS_OK or SVC_STATUS_ERROR

COMMAND_RSU_RETRY

query firmware for the current image’s retry counter, return status is SVC_STATUS_OK or SVC_STATUS_ERROR

COMMAND_RSU_MAX_RETRY

query firmware for the max retry value, return status is SVC_STATUS_OK or SVC_STATUS_ERROR

COMMAND_RSU_DCMF_VERSION

query firmware for the DCMF version, return status is SVC_STATUS_OK or SVC_STATUS_ERROR

COMMAND_RSU_DCMF_STATUS

query firmware for the DCMF status return status is SVC_STATUS_OK or SVC_STATUS_ERROR

COMMAND_FIRMWARE_VERSION

query running firmware version, return status is SVC_STATUS_OK or SVC_STATUS_ERROR

COMMAND_FCS_REQUEST_SERVICE

request validation of image from firmware, return status is SVC_STATUS_OK, SVC_STATUS_INVALID_PARAM

COMMAND_FCS_SEND_CERTIFICATE

send a certificate, return status is SVC_STATUS_OK, SVC_STATUS_INVALID_PARAM, SVC_STATUS_ERROR

COMMAND_FCS_GET_PROVISION_DATA

read the provisioning data, return status is SVC_STATUS_OK, SVC_STATUS_INVALID_PARAM, SVC_STATUS_ERROR

COMMAND_FCS_DATA_ENCRYPTION

encrypt the data, return status is SVC_STATUS_OK, SVC_STATUS_INVALID_PARAM, SVC_STATUS_ERROR

COMMAND_FCS_DATA_DECRYPTION

decrypt the data, return status is SVC_STATUS_OK, SVC_STATUS_INVALID_PARAM, SVC_STATUS_ERROR

COMMAND_FCS_RANDOM_NUMBER_GEN

generate a random number, return status is SVC_STATUS_OK, SVC_STATUS_ERROR

COMMAND_POLL_SERVICE_STATUS

poll if the service request is complete, return statis is SVC_STATUS_OK, SVC_STATUS_ERROR or SVC_STATUS_BUSY

COMMAND_MBOX_SEND_CMD

send generic mailbox command, return status is SVC_STATUS_OK or SVC_STATUS_ERROR

COMMAND_SMC_SVC_VERSION

Non-mailbox SMC SVC API Version, return status is SVC_STATUS_OK

struct stratix10_svc_client_msg

message sent by client to service

Definition:

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

Members

payload

starting address of data need be processed

payload_length

to be processed data size in bytes

payload_output

starting address of processed data

payload_length_output

processed 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.