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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/*
* Fill out firmware related FRUs (Field Replaceable Units)
*
* Copyright 2013-2019 IBM Corp.
*/
#include <skiboot.h>
#include <stdlib.h>
#include <string.h>
#include <ipmi.h>
#include <lock.h>
#include <opal.h>
#include <device.h>
struct product_info {
char *manufacturer;
char *product;
char *part_no;
char *version;
char *serial_no;
char *asset_tag;
};
struct common_header {
u8 version;
u8 internal_offset;
u8 chassis_offset;
u8 board_offset;
u8 product_offset;
u8 multirecord_offset;
u8 pad;
u8 checksum;
} __packed;
/* The maximum amount of FRU data we can store. */
#define FRU_DATA_SIZE 256
/* We allocate two bytes at these locations in the data array to track
* state. */
#define WRITE_INDEX 256
#define REMAINING 257
/* The ASCII string encoding used only has 5 bits to encode length
* hence the maximum is 31 characters. */
#define MAX_STR_LEN 31
static u8 fru_dev_id = 0;
static int fru_insert_string(u8 *buf, char *str)
{
int len = strlen(str);
/* The ASCII type/length format only supports a string length
* between 2 and 31 characters. Zero characters is ok though
* as it indicates no data present. */
if (len == 1 || len > MAX_STR_LEN)
return OPAL_PARAMETER;
buf[0] = 0xc0 | len;
memcpy(&buf[1], str, len);
return len + 1;
}
static u8 fru_checksum(u8 *buf, int len)
{
int i;
u8 checksum = 0;
for(i = 0; i < len; i++) {
checksum += buf[i];
}
checksum = ~checksum + 1;
return checksum;
}
#define FRU_INSERT_STRING(x, y) \
({ rc = fru_insert_string(x, y); \
{ if (rc < 1) return OPAL_PARAMETER; } rc; })
static int fru_fill_product_info(u8 *buf, struct product_info *info, size_t size)
{
size_t total_size = 11;
int index = 0;
int rc;
total_size += strlen(info->manufacturer);
total_size += strlen(info->product);
total_size += strlen(info->part_no);
total_size += strlen(info->version);
total_size += strlen(info->serial_no);
total_size += strlen(info->asset_tag);
total_size += (8 - (total_size % 8)) % 8;
if (total_size > size)
return OPAL_PARAMETER;
buf[index++] = 0x1; /* Version */
buf[index++] = total_size / 8; /* Size */
buf[index++] = 0; /* Language code (English) */
index += FRU_INSERT_STRING(&buf[index], info->manufacturer);
index += FRU_INSERT_STRING(&buf[index], info->product);
index += FRU_INSERT_STRING(&buf[index], info->part_no);
index += FRU_INSERT_STRING(&buf[index], info->version);
index += FRU_INSERT_STRING(&buf[index], info->serial_no);
index += FRU_INSERT_STRING(&buf[index], info->asset_tag);
buf[index++] = 0xc1; /* End of data marker */
memset(&buf[index], 0, total_size - index - 1);
index += total_size - index - 1;
buf[index] = fru_checksum(buf, index);
assert(index == total_size - 1);
return total_size;
}
static int fru_add(u8 *buf, int size)
{
int len;
struct common_header common_hdr;
char *short_version;
struct product_info info = {
.manufacturer = (char *) "IBM",
.product = (char *) "skiboot",
.part_no = (char *) "",
.serial_no = (char *) "",
.asset_tag = (char *) "",
};
if (size < sizeof(common_hdr))
return OPAL_PARAMETER;
/* We currently only support adding the version number at the
* product information offset. We choose an offset of 64 bytes
* because that's what the standard recommends. */
common_hdr.version = 1;
common_hdr.internal_offset = 0;
common_hdr.chassis_offset = 0;
common_hdr.board_offset = 0;
common_hdr.product_offset = 64/8;
common_hdr.multirecord_offset = 0;
common_hdr.pad = 0;
common_hdr.checksum = fru_checksum((u8 *) &common_hdr, sizeof(common_hdr) - 1);
memcpy(buf, &common_hdr, sizeof(common_hdr));
short_version = strdup(version);
info.version = short_version;
if (!strncmp(version, "skiboot-", 8))
info.version = &short_version[8];
if (strlen(info.version) >= MAX_STR_LEN) {
if (info.version[MAX_STR_LEN] != '\0')
info.version[MAX_STR_LEN - 1] = '+';
info.version[MAX_STR_LEN] = '\0';
}
len = fru_fill_product_info(&buf[64], &info, size - 64);
free(short_version);
if (len < 0)
return OPAL_PARAMETER;
return len + 64;
}
static void fru_write_complete(struct ipmi_msg *msg)
{
u8 write_count = msg->data[0];
u16 offset;
msg->data[WRITE_INDEX] += write_count;
msg->data[REMAINING] -= write_count;
if (msg->data[REMAINING] == 0)
goto out;
offset = msg->data[WRITE_INDEX];
ipmi_init_msg(msg, IPMI_DEFAULT_INTERFACE, IPMI_WRITE_FRU,
fru_write_complete, NULL,
MIN(msg->data[REMAINING] + 3, IPMI_MAX_REQ_SIZE), 2);
memmove(&msg->data[3], &msg->data[offset + 3], msg->req_size - 3);
msg->data[0] = fru_dev_id; /* FRU Device ID */
msg->data[1] = offset & 0xff; /* Offset LSB */
msg->data[2] = (offset >> 8) & 0xff; /* Offset MSB */
ipmi_queue_msg(msg);
return;
out:
ipmi_free_msg(msg);
}
static int fru_write(void)
{
struct ipmi_msg *msg;
int len;
/* We allocate FRU_DATA_SIZE + 5 bytes for the message:
* - 3 bytes for the the write FRU command header
* - FRU_DATA_SIZE bytes for FRU data
* - 2 bytes for offset & bytes remaining count
*/
msg = ipmi_mkmsg(IPMI_DEFAULT_INTERFACE, IPMI_WRITE_FRU,
fru_write_complete, NULL, NULL, FRU_DATA_SIZE + 5, 2);
if (!msg)
return OPAL_RESOURCE;
msg->data[0] = fru_dev_id; /* FRU Device ID */
msg->data[1] = 0x0; /* Offset LSB (we always write a new common header) */
msg->data[2] = 0x0; /* Offset MSB */
len = fru_add(&msg->data[3], FRU_DATA_SIZE);
if (len < 0)
return len;
/* Three bytes for the actual FRU Data Command */
msg->data[WRITE_INDEX] = 0;
msg->data[REMAINING] = len;
msg->req_size = MIN(len + 3, IPMI_MAX_REQ_SIZE);
return ipmi_queue_msg(msg);
}
void ipmi_fru_init(u8 dev_id)
{
fru_dev_id = dev_id;
fru_write();
return;
}
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