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sed-opal.c
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/*
* Copyright © 2016 Intel Corporation
*
* Authors:
* Scott Bauer <scott.bauer@intel.com>
* Rafael Antognolli <rafael.antognolli@intel.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":OPAL: " fmt
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <uapi/linux/sed-opal.h>
#include <linux/sed-opal.h>
#include <linux/string.h>
#include <linux/kdev_t.h>
#include "opal_proto.h"
static const u8 opaluid[][OPAL_UID_LENGTH] = {
/* users */
[OPAL_SMUID_UID] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff },
[OPAL_THISSP_UID] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 },
[OPAL_ADMINSP_UID] =
{ 0x00, 0x00, 0x02, 0x05, 0x00, 0x00, 0x00, 0x01 },
[OPAL_LOCKINGSP_UID] =
{ 0x00, 0x00, 0x02, 0x05, 0x00, 0x00, 0x00, 0x02 },
[OPAL_ENTERPRISE_LOCKINGSP_UID] =
{ 0x00, 0x00, 0x02, 0x05, 0x00, 0x01, 0x00, 0x01 },
[OPAL_ANYBODY_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x01 },
[OPAL_SID_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x06 },
[OPAL_ADMIN1_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x01, 0x00, 0x01 },
[OPAL_USER1_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x03, 0x00, 0x01 },
[OPAL_USER2_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x03, 0x00, 0x02 },
[OPAL_PSID_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x01, 0xff, 0x01 },
[OPAL_ENTERPRISE_BANDMASTER0_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x80, 0x01 },
[OPAL_ENTERPRISE_ERASEMASTER_UID] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x84, 0x01 },
/* tables */
[OPAL_LOCKINGRANGE_GLOBAL] =
{ 0x00, 0x00, 0x08, 0x02, 0x00, 0x00, 0x00, 0x01 },
[OPAL_LOCKINGRANGE_ACE_RDLOCKED] =
{ 0x00, 0x00, 0x00, 0x08, 0x00, 0x03, 0xE0, 0x01 },
[OPAL_LOCKINGRANGE_ACE_WRLOCKED] =
{ 0x00, 0x00, 0x00, 0x08, 0x00, 0x03, 0xE8, 0x01 },
[OPAL_MBRCONTROL] =
{ 0x00, 0x00, 0x08, 0x03, 0x00, 0x00, 0x00, 0x01 },
[OPAL_MBR] =
{ 0x00, 0x00, 0x08, 0x04, 0x00, 0x00, 0x00, 0x00 },
[OPAL_AUTHORITY_TABLE] =
{ 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x00},
[OPAL_C_PIN_TABLE] =
{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x00, 0x00},
[OPAL_LOCKING_INFO_TABLE] =
{ 0x00, 0x00, 0x08, 0x01, 0x00, 0x00, 0x00, 0x01 },
[OPAL_ENTERPRISE_LOCKING_INFO_TABLE] =
{ 0x00, 0x00, 0x08, 0x01, 0x00, 0x00, 0x00, 0x00 },
/* C_PIN_TABLE object ID's */
[OPAL_C_PIN_MSID] =
{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x84, 0x02},
[OPAL_C_PIN_SID] =
{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x00, 0x01},
[OPAL_C_PIN_ADMIN1] =
{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x01, 0x00, 0x01},
/* half UID's (only first 4 bytes used) */
[OPAL_HALF_UID_AUTHORITY_OBJ_REF] =
{ 0x00, 0x00, 0x0C, 0x05, 0xff, 0xff, 0xff, 0xff },
[OPAL_HALF_UID_BOOLEAN_ACE] =
{ 0x00, 0x00, 0x04, 0x0E, 0xff, 0xff, 0xff, 0xff },
/* special value for omitted optional parameter */
[OPAL_UID_HEXFF] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
};
/*
* TCG Storage SSC Methods.
* Derived from: TCG_Storage_Architecture_Core_Spec_v2.01_r1.00
* Section: 6.3 Assigned UIDs
*/
static const u8 opalmethod[][OPAL_UID_LENGTH] = {
[OPAL_PROPERTIES] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x01 },
[OPAL_STARTSESSION] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x02 },
[OPAL_REVERT] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x02, 0x02 },
[OPAL_ACTIVATE] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x02, 0x03 },
[OPAL_EGET] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x06 },
[OPAL_ESET] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x07 },
[OPAL_NEXT] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x08 },
[OPAL_EAUTHENTICATE] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x0c },
[OPAL_GETACL] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x0d },
[OPAL_GENKEY] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x10 },
[OPAL_REVERTSP] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x11 },
[OPAL_GET] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x16 },
[OPAL_SET] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x17 },
[OPAL_AUTHENTICATE] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x1c },
[OPAL_RANDOM] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x06, 0x01 },
[OPAL_ERASE] =
{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x08, 0x03 },
};
typedef int (cont_fn)(struct opal_dev *dev);
static int end_opal_session_error(struct opal_dev *dev);
struct opal_suspend_data {
struct opal_lock_unlock unlk;
u8 lr;
struct list_head node;
};
/*
* Derived from:
* TCG_Storage_Architecture_Core_Spec_v2.01_r1.00
* Section: 5.1.5 Method Status Codes
*/
static const char * const opal_errors[] = {
"Success",
"Not Authorized",
"Unknown Error",
"SP Busy",
"SP Failed",
"SP Disabled",
"SP Frozen",
"No Sessions Available",
"Uniqueness Conflict",
"Insufficient Space",
"Insufficient Rows",
"Invalid Function",
"Invalid Parameter",
"Invalid Reference",
"Unknown Error",
"TPER Malfunction",
"Transaction Failure",
"Response Overflow",
"Authority Locked Out",
};
static const char *opal_error_to_human(int error)
{
if (error == 0x3f)
return "Failed";
if (error >= ARRAY_SIZE(opal_errors) || error < 0)
return "Unknown Error";
return opal_errors[error];
}
static void print_buffer(const u8 *ptr, u32 length)
{
#ifdef DEBUG
print_hex_dump_bytes("OPAL: ", DUMP_PREFIX_OFFSET, ptr, length);
pr_debug("\n");
#endif
}
static bool check_tper(const void *data)
{
const struct d0_tper_features *tper = data;
u8 flags = tper->supported_features;
if (!(flags & TPER_SYNC_SUPPORTED)) {
pr_err("TPer sync not supported. flags = %d\n",
tper->supported_features);
return false;
}
return true;
}
static bool check_sum(const void *data)
{
const struct d0_single_user_mode *sum = data;
u32 nlo = be32_to_cpu(sum->num_locking_objects);
if (nlo == 0) {
pr_err("Need at least one locking object.\n");
return false;
}
pr_debug("Number of locking objects: %d\n", nlo);
return true;
}
static u16 get_comid_v100(const void *data)
{
const struct d0_opal_v100 *v100 = data;
return be16_to_cpu(v100->baseComID);
}
static u16 get_comid_v200(const void *data)
{
const struct d0_opal_v200 *v200 = data;
return be16_to_cpu(v200->baseComID);
}
static int opal_send_cmd(struct opal_dev *dev)
{
return dev->send_recv(dev, dev->comid, TCG_SECP_01,
dev->cmd, IO_BUFFER_LENGTH,
true);
}
static int opal_recv_cmd(struct opal_dev *dev)
{
return dev->send_recv(dev, dev->comid, TCG_SECP_01,
dev->resp, IO_BUFFER_LENGTH,
false);
}
static int opal_recv_check(struct opal_dev *dev)
{
size_t buflen = IO_BUFFER_LENGTH;
void *buffer = dev->resp;
struct opal_header *hdr = buffer;
int ret;
do {
pr_debug("Sent OPAL command: outstanding=%d, minTransfer=%d\n",
hdr->cp.outstandingData,
hdr->cp.minTransfer);
if (hdr->cp.outstandingData == 0 ||
hdr->cp.minTransfer != 0)
return 0;
memset(buffer, 0, buflen);
ret = opal_recv_cmd(dev);
} while (!ret);
return ret;
}
static int opal_send_recv(struct opal_dev *dev, cont_fn *cont)
{
int ret;
ret = opal_send_cmd(dev);
if (ret)
return ret;
ret = opal_recv_cmd(dev);
if (ret)
return ret;
ret = opal_recv_check(dev);
if (ret)
return ret;
return cont(dev);
}
static void check_geometry(struct opal_dev *dev, const void *data)
{
const struct d0_geometry_features *geo = data;
dev->align = geo->alignment_granularity;
dev->lowest_lba = geo->lowest_aligned_lba;
}
static int next(struct opal_dev *dev)
{
opal_step func;
int error = 0;
do {
func = dev->funcs[dev->state];
if (!func)
break;
error = func(dev);
if (error) {
pr_err("Error on step function: %d with error %d: %s\n",
dev->state, error,
opal_error_to_human(error));
/* For each OPAL command we do a discovery0 then we
* start some sort of session.
* If we haven't passed state 1 then there was an error
* on discovery0 or during the attempt to start a
* session. Therefore we shouldn't attempt to terminate
* a session, as one has not yet been created.
*/
if (dev->state > 1)
return end_opal_session_error(dev);
}
dev->state++;
} while (!error);
return error;
}
static int opal_discovery0_end(struct opal_dev *dev)
{
bool found_com_id = false, supported = true, single_user = false;
const struct d0_header *hdr = (struct d0_header *)dev->resp;
const u8 *epos = dev->resp, *cpos = dev->resp;
u16 comid = 0;
print_buffer(dev->resp, be32_to_cpu(hdr->length));
epos += be32_to_cpu(hdr->length); /* end of buffer */
cpos += sizeof(*hdr); /* current position on buffer */
while (cpos < epos && supported) {
const struct d0_features *body =
(const struct d0_features *)cpos;
switch (be16_to_cpu(body->code)) {
case FC_TPER:
supported = check_tper(body->features);
break;
case FC_SINGLEUSER:
single_user = check_sum(body->features);
break;
case FC_GEOMETRY:
check_geometry(dev, body);
break;
case FC_LOCKING:
case FC_ENTERPRISE:
case FC_DATASTORE:
/* some ignored properties */
pr_debug("Found OPAL feature description: %d\n",
be16_to_cpu(body->code));
break;
case FC_OPALV100:
comid = get_comid_v100(body->features);
found_com_id = true;
break;
case FC_OPALV200:
comid = get_comid_v200(body->features);
found_com_id = true;
break;
case 0xbfff ... 0xffff:
/* vendor specific, just ignore */
break;
default:
pr_debug("OPAL Unknown feature: %d\n",
be16_to_cpu(body->code));
}
cpos += body->length + 4;
}
if (!supported) {
pr_err("This device is not Opal enabled. Not Supported!\n");
return -EOPNOTSUPP;
}
if (!single_user)
pr_warn("Device doesn't support single user mode\n");
if (!found_com_id) {
pr_warn("Could not find OPAL comid for device. Returning early\n");
return -EOPNOTSUPP;;
}
dev->comid = comid;
return 0;
}
static int opal_discovery0(struct opal_dev *dev)
{
int ret;
memset(dev->resp, 0, IO_BUFFER_LENGTH);
dev->comid = OPAL_DISCOVERY_COMID;
ret = opal_recv_cmd(dev);
if (ret)
return ret;
return opal_discovery0_end(dev);
}
static void add_token_u8(int *err, struct opal_dev *cmd, u8 tok)
{
if (*err)
return;
if (cmd->pos >= IO_BUFFER_LENGTH - 1) {
pr_err("Error adding u8: end of buffer.\n");
*err = -ERANGE;
return;
}
cmd->cmd[cmd->pos++] = tok;
}
static void add_short_atom_header(struct opal_dev *cmd, bool bytestring,
bool has_sign, int len)
{
u8 atom;
int err = 0;
atom = SHORT_ATOM_ID;
atom |= bytestring ? SHORT_ATOM_BYTESTRING : 0;
atom |= has_sign ? SHORT_ATOM_SIGNED : 0;
atom |= len & SHORT_ATOM_LEN_MASK;
add_token_u8(&err, cmd, atom);
}
static void add_medium_atom_header(struct opal_dev *cmd, bool bytestring,
bool has_sign, int len)
{
u8 header0;
header0 = MEDIUM_ATOM_ID;
header0 |= bytestring ? MEDIUM_ATOM_BYTESTRING : 0;
header0 |= has_sign ? MEDIUM_ATOM_SIGNED : 0;
header0 |= (len >> 8) & MEDIUM_ATOM_LEN_MASK;
cmd->cmd[cmd->pos++] = header0;
cmd->cmd[cmd->pos++] = len;
}
static void add_token_u64(int *err, struct opal_dev *cmd, u64 number)
{
size_t len;
int msb;
u8 n;
if (!(number & ~TINY_ATOM_DATA_MASK)) {
add_token_u8(err, cmd, number);
return;
}
msb = fls(number);
len = DIV_ROUND_UP(msb, 4);
if (cmd->pos >= IO_BUFFER_LENGTH - len - 1) {
pr_err("Error adding u64: end of buffer.\n");
*err = -ERANGE;
return;
}
add_short_atom_header(cmd, false, false, len);
while (len--) {
n = number >> (len * 8);
add_token_u8(err, cmd, n);
}
}
static void add_token_bytestring(int *err, struct opal_dev *cmd,
const u8 *bytestring, size_t len)
{
size_t header_len = 1;
bool is_short_atom = true;
if (*err)
return;
if (len & ~SHORT_ATOM_LEN_MASK) {
header_len = 2;
is_short_atom = false;
}
if (len >= IO_BUFFER_LENGTH - cmd->pos - header_len) {
pr_err("Error adding bytestring: end of buffer.\n");
*err = -ERANGE;
return;
}
if (is_short_atom)
add_short_atom_header(cmd, true, false, len);
else
add_medium_atom_header(cmd, true, false, len);
memcpy(&cmd->cmd[cmd->pos], bytestring, len);
cmd->pos += len;
}
static int build_locking_range(u8 *buffer, size_t length, u8 lr)
{
if (length > OPAL_UID_LENGTH) {
pr_err("Can't build locking range. Length OOB\n");
return -ERANGE;
}
memcpy(buffer, opaluid[OPAL_LOCKINGRANGE_GLOBAL], OPAL_UID_LENGTH);
if (lr == 0)
return 0;
buffer[5] = LOCKING_RANGE_NON_GLOBAL;
buffer[7] = lr;
return 0;
}
static int build_locking_user(u8 *buffer, size_t length, u8 lr)
{
if (length > OPAL_UID_LENGTH) {
pr_err("Can't build locking range user, Length OOB\n");
return -ERANGE;
}
memcpy(buffer, opaluid[OPAL_USER1_UID], OPAL_UID_LENGTH);
buffer[7] = lr + 1;
return 0;
}
static void set_comid(struct opal_dev *cmd, u16 comid)
{
struct opal_header *hdr = (struct opal_header *)cmd->cmd;
hdr->cp.extendedComID[0] = comid >> 8;
hdr->cp.extendedComID[1] = comid;
hdr->cp.extendedComID[2] = 0;
hdr->cp.extendedComID[3] = 0;
}
static int cmd_finalize(struct opal_dev *cmd, u32 hsn, u32 tsn)
{
struct opal_header *hdr;
int err = 0;
add_token_u8(&err, cmd, OPAL_ENDOFDATA);
add_token_u8(&err, cmd, OPAL_STARTLIST);
add_token_u8(&err, cmd, 0);
add_token_u8(&err, cmd, 0);
add_token_u8(&err, cmd, 0);
add_token_u8(&err, cmd, OPAL_ENDLIST);
if (err) {
pr_err("Error finalizing command.\n");
return -EFAULT;
}
hdr = (struct opal_header *) cmd->cmd;
hdr->pkt.tsn = cpu_to_be32(tsn);
hdr->pkt.hsn = cpu_to_be32(hsn);
hdr->subpkt.length = cpu_to_be32(cmd->pos - sizeof(*hdr));
while (cmd->pos % 4) {
if (cmd->pos >= IO_BUFFER_LENGTH) {
pr_err("Error: Buffer overrun\n");
return -ERANGE;
}
cmd->cmd[cmd->pos++] = 0;
}
hdr->pkt.length = cpu_to_be32(cmd->pos - sizeof(hdr->cp) -
sizeof(hdr->pkt));
hdr->cp.length = cpu_to_be32(cmd->pos - sizeof(hdr->cp));
return 0;
}
static enum opal_response_token token_type(const struct parsed_resp *resp,
int n)
{
const struct opal_resp_tok *tok;
if (n >= resp->num) {
pr_err("Token number doesn't exist: %d, resp: %d\n",
n, resp->num);
return OPAL_DTA_TOKENID_INVALID;
}
tok = &resp->toks[n];
if (tok->len == 0) {
pr_err("Token length must be non-zero\n");
return OPAL_DTA_TOKENID_INVALID;
}
return tok->type;
}
/*
* This function returns 0 in case of invalid token. One should call
* token_type() first to find out if the token is valid or not.
*/
static enum opal_token response_get_token(const struct parsed_resp *resp,
int n)
{
const struct opal_resp_tok *tok;
if (n >= resp->num) {
pr_err("Token number doesn't exist: %d, resp: %d\n",
n, resp->num);
return 0;
}
tok = &resp->toks[n];
if (tok->len == 0) {
pr_err("Token length must be non-zero\n");
return 0;
}
return tok->pos[0];
}
static size_t response_parse_tiny(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = 1;
tok->width = OPAL_WIDTH_TINY;
if (pos[0] & TINY_ATOM_SIGNED) {
tok->type = OPAL_DTA_TOKENID_SINT;
} else {
tok->type = OPAL_DTA_TOKENID_UINT;
tok->stored.u = pos[0] & 0x3f;
}
return tok->len;
}
static size_t response_parse_short(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = (pos[0] & SHORT_ATOM_LEN_MASK) + 1;
tok->width = OPAL_WIDTH_SHORT;
if (pos[0] & SHORT_ATOM_BYTESTRING) {
tok->type = OPAL_DTA_TOKENID_BYTESTRING;
} else if (pos[0] & SHORT_ATOM_SIGNED) {
tok->type = OPAL_DTA_TOKENID_SINT;
} else {
u64 u_integer = 0;
int i, b = 0;
tok->type = OPAL_DTA_TOKENID_UINT;
if (tok->len > 9) {
pr_warn("uint64 with more than 8 bytes\n");
return -EINVAL;
}
for (i = tok->len - 1; i > 0; i--) {
u_integer |= ((u64)pos[i] << (8 * b));
b++;
}
tok->stored.u = u_integer;
}
return tok->len;
}
static size_t response_parse_medium(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = (((pos[0] & MEDIUM_ATOM_LEN_MASK) << 8) | pos[1]) + 2;
tok->width = OPAL_WIDTH_MEDIUM;
if (pos[0] & MEDIUM_ATOM_BYTESTRING)
tok->type = OPAL_DTA_TOKENID_BYTESTRING;
else if (pos[0] & MEDIUM_ATOM_SIGNED)
tok->type = OPAL_DTA_TOKENID_SINT;
else
tok->type = OPAL_DTA_TOKENID_UINT;
return tok->len;
}
static size_t response_parse_long(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = ((pos[1] << 16) | (pos[2] << 8) | pos[3]) + 4;
tok->width = OPAL_WIDTH_LONG;
if (pos[0] & LONG_ATOM_BYTESTRING)
tok->type = OPAL_DTA_TOKENID_BYTESTRING;
else if (pos[0] & LONG_ATOM_SIGNED)
tok->type = OPAL_DTA_TOKENID_SINT;
else
tok->type = OPAL_DTA_TOKENID_UINT;
return tok->len;
}
static size_t response_parse_token(struct opal_resp_tok *tok,
const u8 *pos)
{
tok->pos = pos;
tok->len = 1;
tok->type = OPAL_DTA_TOKENID_TOKEN;
tok->width = OPAL_WIDTH_TOKEN;
return tok->len;
}
static int response_parse(const u8 *buf, size_t length,
struct parsed_resp *resp)
{
const struct opal_header *hdr;
struct opal_resp_tok *iter;
int num_entries = 0;
int total;
size_t token_length;
const u8 *pos;
if (!buf)
return -EFAULT;
if (!resp)
return -EFAULT;
hdr = (struct opal_header *)buf;
pos = buf;
pos += sizeof(*hdr);
pr_debug("Response size: cp: %d, pkt: %d, subpkt: %d\n",
be32_to_cpu(hdr->cp.length),
be32_to_cpu(hdr->pkt.length),
be32_to_cpu(hdr->subpkt.length));
if (hdr->cp.length == 0 || hdr->pkt.length == 0 ||
hdr->subpkt.length == 0) {
pr_err("Bad header length. cp: %d, pkt: %d, subpkt: %d\n",
be32_to_cpu(hdr->cp.length),
be32_to_cpu(hdr->pkt.length),
be32_to_cpu(hdr->subpkt.length));
print_buffer(pos, sizeof(*hdr));
return -EINVAL;
}
if (pos > buf + length)
return -EFAULT;
iter = resp->toks;
total = be32_to_cpu(hdr->subpkt.length);
print_buffer(pos, total);
while (total > 0) {
if (pos[0] <= TINY_ATOM_BYTE) /* tiny atom */
token_length = response_parse_tiny(iter, pos);
else if (pos[0] <= SHORT_ATOM_BYTE) /* short atom */
token_length = response_parse_short(iter, pos);
else if (pos[0] <= MEDIUM_ATOM_BYTE) /* medium atom */
token_length = response_parse_medium(iter, pos);
else if (pos[0] <= LONG_ATOM_BYTE) /* long atom */
token_length = response_parse_long(iter, pos);
else /* TOKEN */
token_length = response_parse_token(iter, pos);
if (token_length == -EINVAL)
return -EINVAL;
pos += token_length;
total -= token_length;
iter++;
num_entries++;
}
if (num_entries == 0) {
pr_err("Couldn't parse response.\n");
return -EINVAL;
}
resp->num = num_entries;
return 0;
}
static size_t response_get_string(const struct parsed_resp *resp, int n,
const char **store)
{
*store = NULL;
if (!resp) {
pr_err("Response is NULL\n");
return 0;
}
if (n > resp->num) {
pr_err("Response has %d tokens. Can't access %d\n",
resp->num, n);
return 0;
}
if (resp->toks[n].type != OPAL_DTA_TOKENID_BYTESTRING) {
pr_err("Token is not a byte string!\n");
return 0;
}
*store = resp->toks[n].pos + 1;
return resp->toks[n].len - 1;
}
static u64 response_get_u64(const struct parsed_resp *resp, int n)
{
if (!resp) {
pr_err("Response is NULL\n");
return 0;
}
if (n > resp->num) {
pr_err("Response has %d tokens. Can't access %d\n",
resp->num, n);
return 0;
}
if (resp->toks[n].type != OPAL_DTA_TOKENID_UINT) {
pr_err("Token is not unsigned it: %d\n",
resp->toks[n].type);
return 0;
}
if (!(resp->toks[n].width == OPAL_WIDTH_TINY ||
resp->toks[n].width == OPAL_WIDTH_SHORT)) {
pr_err("Atom is not short or tiny: %d\n",
resp->toks[n].width);
return 0;
}
return resp->toks[n].stored.u;
}
static u8 response_status(const struct parsed_resp *resp)
{
if (token_type(resp, 0) == OPAL_DTA_TOKENID_TOKEN &&
response_get_token(resp, 0) == OPAL_ENDOFSESSION) {
return 0;
}
if (resp->num < 5)
return DTAERROR_NO_METHOD_STATUS;
if (token_type(resp, resp->num - 1) != OPAL_DTA_TOKENID_TOKEN ||
token_type(resp, resp->num - 5) != OPAL_DTA_TOKENID_TOKEN ||
response_get_token(resp, resp->num - 1) != OPAL_ENDLIST ||
response_get_token(resp, resp->num - 5) != OPAL_STARTLIST)
return DTAERROR_NO_METHOD_STATUS;
return response_get_u64(resp, resp->num - 4);
}
/* Parses and checks for errors */
static int parse_and_check_status(struct opal_dev *dev)
{
int error;
print_buffer(dev->cmd, dev->pos);
error = response_parse(dev->resp, IO_BUFFER_LENGTH, &dev->parsed);
if (error) {
pr_err("Couldn't parse response.\n");
return error;
}
return response_status(&dev->parsed);
}
static void clear_opal_cmd(struct opal_dev *dev)
{
dev->pos = sizeof(struct opal_header);
memset(dev->cmd, 0, IO_BUFFER_LENGTH);
}
static int start_opal_session_cont(struct opal_dev *dev)
{
u32 hsn, tsn;
int error = 0;
error = parse_and_check_status(dev);
if (error)
return error;
hsn = response_get_u64(&dev->parsed, 4);
tsn = response_get_u64(&dev->parsed, 5);
if (hsn == 0 && tsn == 0) {
pr_err("Couldn't authenticate session\n");
return -EPERM;
}
dev->hsn = hsn;
dev->tsn = tsn;
return 0;
}
static void add_suspend_info(struct opal_dev *dev,
struct opal_suspend_data *sus)
{
struct opal_suspend_data *iter;
list_for_each_entry(iter, &dev->unlk_lst, node) {
if (iter->lr == sus->lr) {
list_del(&iter->node);
kfree(iter);
break;
}
}
list_add_tail(&sus->node, &dev->unlk_lst);
}
static int end_session_cont(struct opal_dev *dev)
{
dev->hsn = 0;
dev->tsn = 0;
return parse_and_check_status(dev);
}
static int finalize_and_send(struct opal_dev *dev, cont_fn cont)
{
int ret;
ret = cmd_finalize(dev, dev->hsn, dev->tsn);
if (ret) {
pr_err("Error finalizing command buffer: %d\n", ret);
return ret;
}
print_buffer(dev->cmd, dev->pos);
return opal_send_recv(dev, cont);
}
static int gen_key(struct opal_dev *dev)
{
const u8 *method;
u8 uid[OPAL_UID_LENGTH];
int err = 0;
clear_opal_cmd(dev);
set_comid(dev, dev->comid);
memcpy(uid, dev->prev_data, min(sizeof(uid), dev->prev_d_len));
method = opalmethod[OPAL_GENKEY];
kfree(dev->prev_data);
dev->prev_data = NULL;
add_token_u8(&err, dev, OPAL_CALL);
add_token_bytestring(&err, dev, uid, OPAL_UID_LENGTH);
add_token_bytestring(&err, dev, opalmethod[OPAL_GENKEY],
OPAL_UID_LENGTH);
add_token_u8(&err, dev, OPAL_STARTLIST);
add_token_u8(&err, dev, OPAL_ENDLIST);
if (err) {
pr_err("Error building gen key command\n");
return err;
}
return finalize_and_send(dev, parse_and_check_status);
}
static int get_active_key_cont(struct opal_dev *dev)
{
const char *activekey;
size_t keylen;
int error = 0;
error = parse_and_check_status(dev);
if (error)
return error;
keylen = response_get_string(&dev->parsed, 4, &activekey);
if (!activekey) {
pr_err("%s: Couldn't extract the Activekey from the response\n",
__func__);
return OPAL_INVAL_PARAM;
}
dev->prev_data = kmemdup(activekey, keylen, GFP_KERNEL);
if (!dev->prev_data)