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dm: mei: add virtio cfgread/cfgwrite handlers.

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mei mediator perform reset handshake via
the cfgread/write handlers and provide access
to fw status registers.

Tracked-On: #1536
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>
This commit is contained in:
Tomas Winkler 2018-10-19 10:32:41 +03:00 committed by wenlingz
parent f462601b0a
commit 7cbb3872a2
1 changed files with 88 additions and 0 deletions
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88
devicemodel/hw/pci/virtio/virtio_mei.c
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@ -665,6 +665,45 @@ static int mei_sysfs_read_property_uuid(char *fname, guid_t *uuid)
return guid_parse(buf, sizeof(buf), uuid);
}
static int
vmei_read_fw_status(struct virtio_mei *vmei, uint32_t *fw_status)
{
int offset, i;
unsigned long int res;
char path[256];
/* each value consist of 8 digits and \n, \0 at the end */
char buf[MEI_FW_STATUS_MAX * 9 + 1] = {0};
char *nptr, *endptr;
if (!fw_status)
return -1;
offset = snprintf(path, sizeof(path) - 1, "%s/%s/%s",
MEI_SYSFS_ROOT, vmei->name, "fw_status");
if (offset < 0)
return -1;
if (mei_sysfs_read_property_file(path, buf, sizeof(buf) - 1) < 0)
return -1;
nptr = buf;
for (i = 0; i < MEI_FW_STATUS_MAX; i++) {
res = strtoul(nptr, &endptr, 16);
if (res == ULONG_MAX) {
fw_status[i] = 0;
continue;
}
if (nptr == endptr) {
fw_status[i] = 0;
continue;
}
fw_status[i] = res;
nptr = endptr;
}
return 0;
}
static void
vmei_virtual_fw_reset(struct virtio_mei *vmei)
{
@ -746,3 +785,52 @@ static int vmei_add_reset_event(struct virtio_mei *vmei)
}
return 0;
}
static int
vmei_cfgread(void *vsc, int offset, int size, uint32_t *retval)
{
struct virtio_mei *vmei = vsc;
void *ptr;
if (offset + size >= (int)offsetof(struct mei_virtio_cfg, fw_status)) {
if (vmei_read_fw_status(vmei, vmei->config->fw_status) < 0)
return -1;
}
ptr = (uint8_t *)vmei->config + offset;
memcpy(retval, ptr, size);
DPRINTF("fw_status[%d] = 0x%08x\n", (offset / size) - 2, *retval);
return 0;
}
static int
vmei_cfgwrite(void *vsc, int offset, int size, uint32_t val)
{
struct virtio_mei *vmei = vsc;
DPRINTF("cfgwrite: offset = %d, size = %d val = %d\n",
offset, size, val);
if (offset != offsetof(struct mei_virtio_cfg, host_reset)) {
WPRINTF("cfgwrite: not a reset\n");
return 0;
}
if (size == sizeof(uint8_t) && val == 1) {
DPRINTF("cfgwrite: host_reset [%d]\n", val);
/* guest initate reset need restart */
vmei_virtual_fw_reset(vmei);
virtio_config_changed(&vmei->base);
}
if (size == sizeof(uint8_t) && val == 0) {
DPRINTF("cfgwrite: host_reset_release [%d]\n", val);
/* guest initate reset need restart */
virtio_config_changed(&vmei->base);
}
return 0;
}