[PATCH v4 11/24] s390/zcrypt: Remove unused functions from cca misc

Harald Freudenberger
2025-04-09T14:03:20Z

The static function findcard() and the zcrypt cca_findcard()
function are both not used any more. Remove this outdated
code and an internal function only called by these.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
---
drivers/s390/crypto/zcrypt_ccamisc.c | 142 ---------------------------
drivers/s390/crypto/zcrypt_ccamisc.h | 9 --
2 files changed, 151 deletions(-)

diff --git a/drivers/s390/crypto/zcrypt_ccamisc.c b/drivers/s390/crypto/zcrypt_ccamisc.c
index f2af3cb7a917..3a6a5b785a0d 100644
--- a/drivers/s390/crypto/zcrypt_ccamisc.c
+++ b/drivers/s390/crypto/zcrypt_ccamisc.c
@@ -1682,22 +1682,6 @@ static void cca_info_cache_update(u16 cardnr, u16 domain,
spin_unlock_bh(&cca_info_list_lock);
}

-static void cca_info_cache_scrub(u16 cardnr, u16 domain)
-{
- struct cca_info_list_entry *ptr;
-
- spin_lock_bh(&cca_info_list_lock);
- list_for_each_entry(ptr, &cca_info_list, list) {
- if (ptr->cardnr == cardnr &&
- ptr->domain == domain) {
- list_del(&ptr->list);
- kfree(ptr);
- break;
- }
- }
- spin_unlock_bh(&cca_info_list_lock);
-}
-
static void __exit mkvp_cache_free(void)
{
struct cca_info_list_entry *ptr, *pnext;
@@ -1802,132 +1786,6 @@ int cca_get_info(u16 card, u16 dom, struct cca_info *ci, int verify)
}
EXPORT_SYMBOL(cca_get_info);

-/*
- * Search for a matching crypto card based on the
- * Master Key Verification Pattern given.
- */
-static int findcard(u64 mkvp, u16 *pcardnr, u16 *pdomain,
- int verify, int minhwtype)
-{
- struct zcrypt_device_status_ext *device_status;
- u16 card, dom;
- struct cca_info ci;
- int i, rc, oi = -1;
-
- /* mkvp must not be zero, minhwtype needs to be >= 0 */
- if (mkvp == 0 || minhwtype < 0)
- return -EINVAL;
-
- /* fetch status of all crypto cards */
- device_status = kvcalloc(MAX_ZDEV_ENTRIES_EXT,
- sizeof(struct zcrypt_device_status_ext),
- GFP_KERNEL);
- if (!device_status)
- return -ENOMEM;
-
- zcrypt_device_status_mask_ext(device_status,
- MAX_ZDEV_CARDIDS_EXT,
- MAX_ZDEV_DOMAINS_EXT);
-
- /* walk through all crypto cards */
- for (i = 0; i < MAX_ZDEV_ENTRIES_EXT; i++) {
- card = AP_QID_CARD(device_status[i].qid);
- dom = AP_QID_QUEUE(device_status[i].qid);
- if (device_status[i].online &&
- device_status[i].functions & 0x04) {
- /* enabled CCA card, check current mkvp from cache */
- if (cca_info_cache_fetch(card, dom, &ci) == 0 &&
- ci.hwtype >= minhwtype &&
- ci.cur_aes_mk_state == '2' &&
- ci.cur_aes_mkvp == mkvp) {
- if (!verify)
- break;
- /* verify: refresh card info */
- if (fetch_cca_info(card, dom, &ci) == 0) {
- cca_info_cache_update(card, dom, &ci);
- if (ci.hwtype >= minhwtype &&
- ci.cur_aes_mk_state == '2' &&
- ci.cur_aes_mkvp == mkvp)
- break;
- }
- }
- } else {
- /* Card is offline and/or not a CCA card. */
- /* del mkvp entry from cache if it exists */
- cca_info_cache_scrub(card, dom);
- }
- }
- if (i >= MAX_ZDEV_ENTRIES_EXT) {
- /* nothing found, so this time without cache */
- for (i = 0; i < MAX_ZDEV_ENTRIES_EXT; i++) {
- if (!(device_status[i].online &&
- device_status[i].functions & 0x04))
- continue;
- card = AP_QID_CARD(device_status[i].qid);
- dom = AP_QID_QUEUE(device_status[i].qid);
- /* fresh fetch mkvp from adapter */
- if (fetch_cca_info(card, dom, &ci) == 0) {
- cca_info_cache_update(card, dom, &ci);
- if (ci.hwtype >= minhwtype &&
- ci.cur_aes_mk_state == '2' &&
- ci.cur_aes_mkvp == mkvp)
- break;
- if (ci.hwtype >= minhwtype &&
- ci.old_aes_mk_state == '2' &&
- ci.old_aes_mkvp == mkvp &&
- oi < 0)
- oi = i;
- }
- }
- if (i >= MAX_ZDEV_ENTRIES_EXT && oi >= 0) {
- /* old mkvp matched, use this card then */
- card = AP_QID_CARD(device_status[oi].qid);
- dom = AP_QID_QUEUE(device_status[oi].qid);
- }
- }
- if (i < MAX_ZDEV_ENTRIES_EXT || oi >= 0) {
- if (pcardnr)
- *pcardnr = card;
- if (pdomain)
- *pdomain = dom;
- rc = (i < MAX_ZDEV_ENTRIES_EXT ? 0 : 1);
- } else {
- rc = -ENODEV;
- }
-
- kvfree(device_status);
- return rc;
-}
-
-/*
- * Search for a matching crypto card based on the Master Key
- * Verification Pattern provided inside a secure key token.
- */
-int cca_findcard(const u8 *key, u16 *pcardnr, u16 *pdomain, int verify)
-{
- u64 mkvp;
- int minhwtype = 0;
- const struct keytoken_header *hdr = (struct keytoken_header *)key;
-
- if (hdr->type != TOKTYPE_CCA_INTERNAL)
- return -EINVAL;
-
- switch (hdr->version) {
- case TOKVER_CCA_AES:
- mkvp = ((struct secaeskeytoken *)key)->mkvp;
- break;
- case TOKVER_CCA_VLSC:
- mkvp = ((struct cipherkeytoken *)key)->mkvp0;
- minhwtype = AP_DEVICE_TYPE_CEX6;
- break;
- default:
- return -EINVAL;
- }
-
- return findcard(mkvp, pcardnr, pdomain, verify, minhwtype);
-}
-EXPORT_SYMBOL(cca_findcard);
-
int cca_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain,
int minhwtype, int mktype, u64 cur_mkvp, u64 old_mkvp,
int verify)
diff --git a/drivers/s390/crypto/zcrypt_ccamisc.h b/drivers/s390/crypto/zcrypt_ccamisc.h
index 273edf2bb036..0662fe39e425 100644
--- a/drivers/s390/crypto/zcrypt_ccamisc.h
+++ b/drivers/s390/crypto/zcrypt_ccamisc.h
@@ -207,15 +207,6 @@ int cca_query_crypto_facility(u16 cardnr, u16 domain,
u8 *rarray, size_t *rarraylen,
u8 *varray, size_t *varraylen);

-/*
- * Search for a matching crypto card based on the Master Key
- * Verification Pattern provided inside a secure key.
- * Works with CCA AES data and cipher keys.
- * Returns < 0 on failure, 0 if CURRENT MKVP matches and
- * 1 if OLD MKVP matches.
- */
-int cca_findcard(const u8 *key, u16 *pcardnr, u16 *pdomain, int verify);
-
/*
* Build a list of cca apqns meeting the following constrains:
* - apqn is online and is in fact a CCA apqn
--
2.43.0