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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2018 Netronome Systems, Inc.
* All rights reserved.
*/
/* Parse the hwinfo table that the ARM firmware builds in the ARM scratch SRAM
* after chip reset.
*
* Examples of the fields:
* me.count = 40
* me.mask = 0x7f_ffff_ffff
*
* me.count is the total number of MEs on the system.
* me.mask is the bitmask of MEs that are available for application usage.
*
* (ie, in this example, ME 39 has been reserved by boardconfig.)
*/
#include <stdio.h>
#include <time.h>
#include "nfp_cpp.h"
#include "nfp6000/nfp6000.h"
#include "nfp_resource.h"
#include "nfp_hwinfo.h"
#include "nfp_crc.h"
static int
nfp_hwinfo_is_updating(struct nfp_hwinfo *hwinfo)
{
return hwinfo->version & NFP_HWINFO_VERSION_UPDATING;
}
static int
nfp_hwinfo_db_walk(struct nfp_hwinfo *hwinfo, uint32_t size)
{
const char *key, *val, *end = hwinfo->data + size;
for (key = hwinfo->data; *key && key < end;
key = val + strlen(val) + 1) {
val = key + strlen(key) + 1;
if (val >= end) {
printf("Bad HWINFO - overflowing key\n");
return -EINVAL;
}
if (val + strlen(val) + 1 > end) {
printf("Bad HWINFO - overflowing value\n");
return -EINVAL;
}
}
return 0;
}
static int
nfp_hwinfo_db_validate(struct nfp_hwinfo *db, uint32_t len)
{
uint32_t size, new_crc, *crc;
size = db->size;
if (size > len) {
printf("Unsupported hwinfo size %u > %u\n", size, len);
return -EINVAL;
}
size -= sizeof(uint32_t);
new_crc = nfp_crc32_posix((char *)db, size);
crc = (uint32_t *)(db->start + size);
if (new_crc != *crc) {
printf("Corrupt hwinfo table (CRC mismatch)\n");
printf("\tcalculated 0x%x, expected 0x%x\n", new_crc, *crc);
return -EINVAL;
}
return nfp_hwinfo_db_walk(db, size);
}
static struct nfp_hwinfo *
nfp_hwinfo_try_fetch(struct nfp_cpp *cpp, size_t *cpp_size)
{
struct nfp_hwinfo *header;
void *res;
uint64_t cpp_addr;
uint32_t cpp_id;
int err;
uint8_t *db;
res = nfp_resource_acquire(cpp, NFP_RESOURCE_NFP_HWINFO);
if (res) {
cpp_id = nfp_resource_cpp_id(res);
cpp_addr = nfp_resource_address(res);
*cpp_size = nfp_resource_size(res);
nfp_resource_release(res);
if (*cpp_size < HWINFO_SIZE_MIN)
return NULL;
} else {
return NULL;
}
db = malloc(*cpp_size + 1);
if (!db)
return NULL;
err = nfp_cpp_read(cpp, cpp_id, cpp_addr, db, *cpp_size);
if (err != (int)*cpp_size)
goto exit_free;
header = (void *)db;
printf("NFP HWINFO header: %08x\n", *(uint32_t *)header);
if (nfp_hwinfo_is_updating(header))
goto exit_free;
if (header->version != NFP_HWINFO_VERSION_2) {
printf("Unknown HWInfo version: 0x%08x\n",
header->version);
goto exit_free;
}
/* NULL-terminate for safety */
db[*cpp_size] = '\0';
return (void *)db;
exit_free:
free(db);
return NULL;
}
static struct nfp_hwinfo *
nfp_hwinfo_fetch(struct nfp_cpp *cpp, size_t *hwdb_size)
{
struct timespec wait;
struct nfp_hwinfo *db;
int count;
wait.tv_sec = 0;
wait.tv_nsec = 10000000;
count = 0;
for (;;) {
db = nfp_hwinfo_try_fetch(cpp, hwdb_size);
if (db)
return db;
nanosleep(&wait, NULL);
if (count++ > 200) {
printf("NFP access error\n");
return NULL;
}
}
}
struct nfp_hwinfo *
nfp_hwinfo_read(struct nfp_cpp *cpp)
{
struct nfp_hwinfo *db;
size_t hwdb_size = 0;
int err;
db = nfp_hwinfo_fetch(cpp, &hwdb_size);
if (!db)
return NULL;
err = nfp_hwinfo_db_validate(db, hwdb_size);
if (err) {
free(db);
return NULL;
}
return db;
}
/*
* nfp_hwinfo_lookup() - Find a value in the HWInfo table by name
* @hwinfo: NFP HWinfo table
* @lookup: HWInfo name to search for
*
* Return: Value of the HWInfo name, or NULL
*/
const char *
nfp_hwinfo_lookup(struct nfp_hwinfo *hwinfo, const char *lookup)
{
const char *key, *val, *end;
if (!hwinfo || !lookup)
return NULL;
end = hwinfo->data + hwinfo->size - sizeof(uint32_t);
for (key = hwinfo->data; *key && key < end;
key = val + strlen(val) + 1) {
val = key + strlen(key) + 1;
if (strcmp(key, lookup) == 0)
return val;
}
return NULL;
}
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