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/*
* CXL CDAT Structure
*
* Copyright (C) 2021 Avery Design Systems, Inc.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "hw/pci/pci.h"
#include "hw/cxl/cxl.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
static void cdat_len_check(CDATSubHeader *hdr, Error **errp)
{
assert(hdr->length);
assert(hdr->reserved == 0);
switch (hdr->type) {
case CDAT_TYPE_DSMAS:
assert(hdr->length == sizeof(CDATDsmas));
break;
case CDAT_TYPE_DSLBIS:
assert(hdr->length == sizeof(CDATDslbis));
break;
case CDAT_TYPE_DSMSCIS:
assert(hdr->length == sizeof(CDATDsmscis));
break;
case CDAT_TYPE_DSIS:
assert(hdr->length == sizeof(CDATDsis));
break;
case CDAT_TYPE_DSEMTS:
assert(hdr->length == sizeof(CDATDsemts));
break;
case CDAT_TYPE_SSLBIS:
assert(hdr->length >= sizeof(CDATSslbisHeader));
assert((hdr->length - sizeof(CDATSslbisHeader)) %
sizeof(CDATSslbe) == 0);
break;
default:
error_setg(errp, "Type %d is reserved", hdr->type);
}
}
static void ct3_build_cdat(CDATObject *cdat, Error **errp)
{
g_autofree CDATTableHeader *cdat_header = NULL;
g_autofree CDATEntry *cdat_st = NULL;
uint8_t sum = 0;
uint8_t *hdr_buf;
int ent, i;
/* Use default table if fopen == NULL */
assert(cdat->build_cdat_table);
cdat_header = g_malloc0(sizeof(*cdat_header));
if (!cdat_header) {
error_setg(errp, "Failed to allocate CDAT header");
return;
}
cdat->built_buf_len = cdat->build_cdat_table(&cdat->built_buf,
cdat->private);
if (cdat->built_buf_len <= 0) {
/* Build later as not all data available yet */
cdat->to_update = true;
return;
}
cdat->to_update = false;
cdat_st = g_malloc0(sizeof(*cdat_st) * (cdat->built_buf_len + 1));
if (!cdat_st) {
error_setg(errp, "Failed to allocate CDAT entry array");
return;
}
/* Entry 0 for CDAT header, starts with Entry 1 */
for (ent = 1; ent < cdat->built_buf_len + 1; ent++) {
CDATSubHeader *hdr = cdat->built_buf[ent - 1];
uint8_t *buf = (uint8_t *)cdat->built_buf[ent - 1];
cdat_st[ent].base = hdr;
cdat_st[ent].length = hdr->length;
cdat_header->length += hdr->length;
for (i = 0; i < hdr->length; i++) {
sum += buf[i];
}
}
/* CDAT header */
cdat_header->revision = CXL_CDAT_REV;
/* For now, no runtime updates */
cdat_header->sequence = 0;
cdat_header->length += sizeof(CDATTableHeader);
hdr_buf = (uint8_t *)cdat_header;
for (i = 0; i < sizeof(*cdat_header); i++) {
sum += hdr_buf[i];
}
/* Sum of all bytes including checksum must be 0 */
cdat_header->checksum = ~sum + 1;
cdat_st[0].base = g_steal_pointer(&cdat_header);
cdat_st[0].length = sizeof(*cdat_header);
cdat->entry_len = 1 + cdat->built_buf_len;
cdat->entry = g_steal_pointer(&cdat_st);
}
static void ct3_load_cdat(CDATObject *cdat, Error **errp)
{
g_autofree CDATEntry *cdat_st = NULL;
g_autofree char *buf = NULL;
uint8_t sum = 0;
int num_ent;
int i = 0, ent = 1;
gsize file_size = 0;
CDATSubHeader *hdr;
GError *error = NULL;
/* Read CDAT file and create its cache */
if (!g_file_get_contents(cdat->filename, (gchar **)&buf,
&file_size, &error)) {
error_setg(errp, "CDAT: File read failed: %s", error->message);
g_error_free(error);
return;
}
if (file_size < sizeof(CDATTableHeader)) {
error_setg(errp, "CDAT: File too short");
return;
}
i = sizeof(CDATTableHeader);
num_ent = 1;
while (i < file_size) {
hdr = (CDATSubHeader *)(buf + i);
if (i + sizeof(CDATSubHeader) > file_size) {
error_setg(errp, "CDAT: Truncated table");
return;
}
cdat_len_check(hdr, errp);
i += hdr->length;
if (i > file_size) {
error_setg(errp, "CDAT: Truncated table");
return;
}
num_ent++;
}
if (i != file_size) {
error_setg(errp, "CDAT: File length mismatch");
return;
}
cdat_st = g_new0(CDATEntry, num_ent);
/* Set CDAT header, Entry = 0 */
cdat_st[0].base = buf;
cdat_st[0].length = sizeof(CDATTableHeader);
i = 0;
while (i < cdat_st[0].length) {
sum += buf[i++];
}
/* Read CDAT structures */
while (i < file_size) {
hdr = (CDATSubHeader *)(buf + i);
cdat_st[ent].base = hdr;
cdat_st[ent].length = hdr->length;
while (buf + i < (char *)cdat_st[ent].base + cdat_st[ent].length) {
assert(i < file_size);
sum += buf[i++];
}
ent++;
}
if (sum != 0) {
warn_report("CDAT: Found checksum mismatch in %s", cdat->filename);
}
cdat->entry_len = num_ent;
cdat->entry = g_steal_pointer(&cdat_st);
cdat->buf = g_steal_pointer(&buf);
}
void cxl_doe_cdat_init(CXLComponentState *cxl_cstate, Error **errp)
{
CDATObject *cdat = &cxl_cstate->cdat;
if (cdat->filename) {
ct3_load_cdat(cdat, errp);
} else {
ct3_build_cdat(cdat, errp);
}
}
void cxl_doe_cdat_update(CXLComponentState *cxl_cstate, Error **errp)
{
CDATObject *cdat = &cxl_cstate->cdat;
if (cdat->to_update) {
ct3_build_cdat(cdat, errp);
}
}
void cxl_doe_cdat_release(CXLComponentState *cxl_cstate)
{
CDATObject *cdat = &cxl_cstate->cdat;
free(cdat->entry);
if (cdat->built_buf) {
cdat->free_cdat_table(cdat->built_buf, cdat->built_buf_len,
cdat->private);
}
g_free(cdat->buf);
}
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