diff options
| -rw-r--r-- | drivers/s390/crypto/zcrypt_ccamisc.c | 47 |
1 files changed, 37 insertions, 10 deletions
diff --git a/drivers/s390/crypto/zcrypt_ccamisc.c b/drivers/s390/crypto/zcrypt_ccamisc.c index bbc804d632a4..7ecd4a7c0792 100644 --- a/drivers/s390/crypto/zcrypt_ccamisc.c +++ b/drivers/s390/crypto/zcrypt_ccamisc.c @@ -52,6 +52,22 @@ static DEFINE_SPINLOCK(cca_info_list_lock); static mempool_t *cprb_mempool; /* + * This is a pre-allocated memory for the device status array + * used within the findcard() functions. It is currently + * 128 * 128 * 4 bytes = 64 KB big. Usage of this memory is + * controlled via dev_status_mem_mutex. Needs adaption if more + * than 128 cards or domains to be are supported. + */ +#define ZCRYPT_DEV_STATUS_CARD_MAX 128 +#define ZCRYPT_DEV_STATUS_QUEUE_MAX 128 +#define ZCRYPT_DEV_STATUS_ENTRIES (ZCRYPT_DEV_STATUS_CARD_MAX * \ + ZCRYPT_DEV_STATUS_QUEUE_MAX) +#define ZCRYPT_DEV_STATUS_EXT_SIZE (ZCRYPT_DEV_STATUS_ENTRIES * \ + sizeof(struct zcrypt_device_status_ext)) +static void *dev_status_mem; +static DEFINE_MUTEX(dev_status_mem_mutex); + +/* * Simple check if the token is a valid CCA secure AES data key * token. If keybitsize is given, the bitsize of the key is * also checked. Returns 0 on success or errno value on failure. @@ -1919,16 +1935,15 @@ int cca_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain, int i, card, dom, curmatch, oldmatch, rc; struct cca_info ci; - /* 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; + /* occupy the device status memory */ + mutex_lock(&dev_status_mem_mutex); + memset(dev_status_mem, 0, ZCRYPT_DEV_STATUS_EXT_SIZE); + device_status = (struct zcrypt_device_status_ext *)dev_status_mem; + /* fetch crypto device status into this struct */ zcrypt_device_status_mask_ext(device_status, - MAX_ZDEV_CARDIDS_EXT, - MAX_ZDEV_DOMAINS_EXT); + ZCRYPT_DEV_STATUS_CARD_MAX, + ZCRYPT_DEV_STATUS_QUEUE_MAX); /* allocate 1k space for up to 256 apqns */ _apqns = kmalloc_array(256, sizeof(u32), GFP_KERNEL); @@ -1938,7 +1953,7 @@ int cca_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain, } /* walk through all the crypto apqnss */ - for (i = 0; i < MAX_ZDEV_ENTRIES_EXT; i++) { + for (i = 0; i < ZCRYPT_DEV_STATUS_ENTRIES; i++) { card = AP_QID_CARD(device_status[i].qid); dom = AP_QID_QUEUE(device_status[i].qid); /* check online state */ @@ -2000,7 +2015,9 @@ int cca_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain, } out: - kvfree(device_status); + /* release the device status memory */ + mutex_unlock(&dev_status_mem_mutex); + return rc; } EXPORT_SYMBOL(cca_findcard2); @@ -2013,11 +2030,21 @@ int __init zcrypt_ccamisc_init(void) if (!cprb_mempool) return -ENOMEM; + /* Pre-allocate one crypto status card struct used in findcard() */ + dev_status_mem = kvmalloc(ZCRYPT_DEV_STATUS_EXT_SIZE, GFP_KERNEL); + if (!dev_status_mem) { + mempool_destroy(cprb_mempool); + return -ENOMEM; + } + return 0; } void zcrypt_ccamisc_exit(void) { mkvp_cache_free(); + mutex_lock(&dev_status_mem_mutex); + kvfree(dev_status_mem); + mutex_unlock(&dev_status_mem_mutex); mempool_destroy(cprb_mempool); } |