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block: sed-opal: Generalizing write data to any opal table 

This patch refactors the existing "write_shadowmbr" func and
creates a new generalized function "generic_table_write_data",
to write data to any opal table. Also, a few cleanups are included
in this patch.

Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>
Reviewed-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Revanth Rajashekar <revanth.rajashekar@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Revanth Rajashekar 2019-10-31 10:13:20 -06:00 committed by Jens Axboe
parent cba22d86e0
commit 3495ea1b5f
1 changed files with 74 additions and 64 deletions
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138
block/sed-opal.c
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@ -1139,11 +1139,11 @@ static int generic_get_column(struct opal_dev *dev, const u8 *table,
*
* the result is provided in dev->resp->tok[4]
*/
static int generic_get_table_info(struct opal_dev *dev, enum opal_uid table,
static int generic_get_table_info(struct opal_dev *dev, const u8 *table_uid,
u64 column)
{
u8 uid[OPAL_UID_LENGTH];
const unsigned int half = OPAL_UID_LENGTH/2;
const unsigned int half = OPAL_UID_LENGTH_HALF;
/* sed-opal UIDs can be split in two halves:
* first: actual table index
@ -1152,7 +1152,7 @@ static int generic_get_table_info(struct opal_dev *dev, enum opal_uid table,
* first part of the target table as relative index into that table
*/
memcpy(uid, opaluid[OPAL_TABLE_TABLE], half);
memcpy(uid+half, opaluid[table], half);
memcpy(uid + half, table_uid, half);
return generic_get_column(dev, uid, column);
}
@ -1221,6 +1221,75 @@ static int get_active_key(struct opal_dev *dev, void *data)
return get_active_key_cont(dev);
}
static int generic_table_write_data(struct opal_dev *dev, const u64 data,
u64 offset, u64 size, const u8 *uid)
{
const u8 __user *src = (u8 __user *)(uintptr_t)data;
u8 *dst;
u64 len;
size_t off = 0;
int err;
/* do we fit in the available space? */
err = generic_get_table_info(dev, uid, OPAL_TABLE_ROWS);
if (err) {
pr_debug("Couldn't get the table size\n");
return err;
}
len = response_get_u64(&dev->parsed, 4);
if (size > len || offset > len - size) {
pr_debug("Does not fit in the table (%llu vs. %llu)\n",
offset + size, len);
return -ENOSPC;
}
/* do the actual transmission(s) */
while (off < size) {
err = cmd_start(dev, uid, opalmethod[OPAL_SET]);
add_token_u8(&err, dev, OPAL_STARTNAME);
add_token_u8(&err, dev, OPAL_WHERE);
add_token_u64(&err, dev, offset + off);
add_token_u8(&err, dev, OPAL_ENDNAME);
add_token_u8(&err, dev, OPAL_STARTNAME);
add_token_u8(&err, dev, OPAL_VALUES);
/*
* The bytestring header is either 1 or 2 bytes, so assume 2.
* There also needs to be enough space to accommodate the
* trailing OPAL_ENDNAME (1 byte) and tokens added by
* cmd_finalize.
*/
len = min(remaining_size(dev) - (2+1+CMD_FINALIZE_BYTES_NEEDED),
(size_t)(size - off));
pr_debug("Write bytes %zu+%llu/%llu\n", off, len, size);
dst = add_bytestring_header(&err, dev, len);
if (!dst)
break;
if (copy_from_user(dst, src + off, len)) {
err = -EFAULT;
break;
}
dev->pos += len;
add_token_u8(&err, dev, OPAL_ENDNAME);
if (err)
break;
err = finalize_and_send(dev, parse_and_check_status);
if (err)
break;
off += len;
}
return err;
}
static int generic_lr_enable_disable(struct opal_dev *dev,
u8 *uid, bool rle, bool wle,
bool rl, bool wl)
@ -1583,68 +1652,9 @@ static int set_mbr_enable_disable(struct opal_dev *dev, void *data)
static int write_shadow_mbr(struct opal_dev *dev, void *data)
{
struct opal_shadow_mbr *shadow = data;
const u8 __user *src;
u8 *dst;
size_t off = 0;
u64 len;
int err = 0;
/* do we fit in the available shadow mbr space? */
err = generic_get_table_info(dev, OPAL_MBR, OPAL_TABLE_ROWS);
if (err) {
pr_debug("MBR: could not get shadow size\n");
return err;
}
len = response_get_u64(&dev->parsed, 4);
if (shadow->size > len || shadow->offset > len - shadow->size) {
pr_debug("MBR: does not fit in shadow (%llu vs. %llu)\n",
shadow->offset + shadow->size, len);
return -ENOSPC;
}
/* do the actual transmission(s) */
src = (u8 __user *)(uintptr_t)shadow->data;
while (off < shadow->size) {
err = cmd_start(dev, opaluid[OPAL_MBR], opalmethod[OPAL_SET]);
add_token_u8(&err, dev, OPAL_STARTNAME);
add_token_u8(&err, dev, OPAL_WHERE);
add_token_u64(&err, dev, shadow->offset + off);
add_token_u8(&err, dev, OPAL_ENDNAME);
add_token_u8(&err, dev, OPAL_STARTNAME);
add_token_u8(&err, dev, OPAL_VALUES);
/*
* The bytestring header is either 1 or 2 bytes, so assume 2.
* There also needs to be enough space to accommodate the
* trailing OPAL_ENDNAME (1 byte) and tokens added by
* cmd_finalize.
*/
len = min(remaining_size(dev) - (2+1+CMD_FINALIZE_BYTES_NEEDED),
(size_t)(shadow->size - off));
pr_debug("MBR: write bytes %zu+%llu/%llu\n",
off, len, shadow->size);
dst = add_bytestring_header(&err, dev, len);
if (!dst)
break;
if (copy_from_user(dst, src + off, len))
err = -EFAULT;
dev->pos += len;
add_token_u8(&err, dev, OPAL_ENDNAME);
if (err)
break;
err = finalize_and_send(dev, parse_and_check_status);
if (err)
break;
off += len;
}
return err;
return generic_table_write_data(dev, shadow->data, shadow->offset,
shadow->size, opaluid[OPAL_MBR]);
}
static int generic_pw_cmd(u8 *key, size_t key_len, u8 *cpin_uid,