s390/zcrypt: Remove unused functions from cca misc

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 Remove this outdated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>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Link: https://lore.kernel.org/r/20250424133619.16495-12-freude@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: hfreude

drivers/s390/crypto/zcrypt_ccamisc.c

@@ -1680,22 +1680,6 @@ 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;
@@ -1800,132 +1784,6 @@ 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)

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