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/* Copyright 2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <endian.h>
#include "libsbefifo.h"
#include "sbefifo_private.h"
static int sbefifo_read(struct sbefifo_context *sctx, void *buf, size_t *buflen)
{
ssize_t n;
assert(*buflen > 0);
n = read(sctx->fd, buf, *buflen);
if (n < 0)
return errno;
*buflen = n;
return 0;
}
static int sbefifo_write(struct sbefifo_context *sctx, void *buf, size_t buflen)
{
ssize_t n;
assert(buflen > 0);
n = write(sctx->fd, buf, buflen);
if (n < 0)
return errno;
if (n != buflen)
return EIO;
return 0;
}
static int sbefifo_transport(struct sbefifo_context *sctx, uint8_t *msg, uint32_t msg_len, uint8_t *out, uint32_t *out_len)
{
int rc;
size_t buflen;
buflen = msg_len;
rc = sbefifo_write(sctx, msg, buflen);
if (rc) {
LOG("write: cmd=%08x, rc=%d\n", be32toh(*(uint32_t *)(msg+4)), rc);
return rc;
}
buflen = *out_len;
rc = sbefifo_read(sctx, out, &buflen);
if (rc) {
LOG("read: cmd=%08x, buflen=%zu, rc=%d\n", be32toh(*(uint32_t *)(msg+4)), buflen, rc);
return rc;
}
*out_len = buflen;
return 0;
}
int sbefifo_parse_output(struct sbefifo_context *sctx, uint32_t cmd,
uint8_t *buf, uint32_t buflen,
uint8_t **out, uint32_t *out_len)
{
uint32_t offset_word, header_word, status_word;
uint32_t offset;
sbefifo_ffdc_clear(sctx);
/*
* At least 3 words are expected in response
* - header word
* - status word
* - header offset word
*/
if (buflen < 3 * sizeof(uint32_t)) {
LOG("reply: cmd=%08x, len=%u\n", cmd, buflen);
return EPROTO;
}
/* Last word is header offset (in words) */
offset_word = be32toh(*(uint32_t *) &buf[buflen-4]);
offset = buflen - (offset_word * 4);
*out_len = offset;
header_word = be32toh(*(uint32_t *) &buf[offset]);
offset += 4;
status_word = be32toh(*(uint32_t *) &buf[offset]);
offset += 4;
if (header_word != (0xc0de0000 | cmd)) {
LOG("reply: cmd=%08x, len=%u, header=%08x\n", cmd, buflen, header_word);
return EPROTO;
}
LOG("reply: cmd=%08x, len=%u, status=%08x\n", cmd, buflen, status_word);
if (status_word) {
sbefifo_ffdc_set(sctx, status_word, buf + offset, buflen - offset-4);
return ESBEFIFO;
}
if (*out_len > 0) {
*out = malloc(*out_len);
if (! *out)
return ENOMEM;
memcpy(*out, buf, *out_len);
} else {
*out = NULL;
}
return 0;
}
int sbefifo_operation(struct sbefifo_context *sctx,
uint8_t *msg, uint32_t msg_len,
uint8_t **out, uint32_t *out_len)
{
uint8_t *buf;
uint32_t buflen;
uint32_t cmd;
int rc;
assert(msg);
assert(msg_len > 0);
if (!sctx->transport && sctx->fd == -1)
return ENOTCONN;
/*
* Allocate extra memory for FFDC (SBEFIFO_MAX_FFDC_SIZE = 0x2000)
* Use *out_len as a hint to expected reply length
*/
buflen = (*out_len + 0x2000 + 3) & ~(uint32_t)3;
buf = malloc(buflen);
if (!buf)
return ENOMEM;
cmd = be32toh(*(uint32_t *)(msg + 4));
LOG("request: cmd=%08x, len=%u\n", cmd, msg_len);
if (sctx->transport)
rc = sctx->transport(msg, msg_len, buf, &buflen, sctx->priv);
else
rc = sbefifo_transport(sctx, msg, msg_len, buf, &buflen);
if (rc) {
free(buf);
if (rc == ETIMEDOUT) {
uint32_t status;
status = SBEFIFO_PRI_UNKNOWN_ERROR | SBEFIFO_SEC_HW_TIMEOUT;
sbefifo_ffdc_set(sctx, status, NULL, 0);
}
return rc;
}
rc = sbefifo_parse_output(sctx, cmd, buf, buflen, out, out_len);
free(buf);
return rc;
}
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