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s390/zcrypt: enable s390 hwrng to seed kernel entropy

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Set the 'quality' property in the zcrypt rng device structure to enable the
zcrypt hwrng device to take part in the kernel entropy seeding process.
A module parameter named hwrng_seed will be introduced to disable the
participation. By default this parameter is set to 1 (enabled).

Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ingo Tuchscherer 2015-03-17 16:02:20 +01:00 committed by Martin Schwidefsky
parent 05a8256c58
commit db490cb9ae
1 changed files with 7 additions and 0 deletions
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7
drivers/s390/crypto/zcrypt_api.c
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@ -54,6 +54,10 @@ MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \
"Copyright IBM Corp. 2001, 2012"); "Copyright IBM Corp. 2001, 2012");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
static int zcrypt_hwrng_seed = 1;
module_param_named(hwrng_seed, zcrypt_hwrng_seed, int, S_IRUSR|S_IRGRP);
MODULE_PARM_DESC(hwrng_seed, "Turn on/off hwrng auto seed, default is 1 (on).");
static DEFINE_SPINLOCK(zcrypt_device_lock); static DEFINE_SPINLOCK(zcrypt_device_lock);
static LIST_HEAD(zcrypt_device_list); static LIST_HEAD(zcrypt_device_list);
static int zcrypt_device_count = 0; static int zcrypt_device_count = 0;
@ -1373,6 +1377,7 @@ static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
static struct hwrng zcrypt_rng_dev = { static struct hwrng zcrypt_rng_dev = {
.name = "zcrypt", .name = "zcrypt",
.data_read = zcrypt_rng_data_read, .data_read = zcrypt_rng_data_read,
.quality = 990,
}; };
static int zcrypt_rng_device_add(void) static int zcrypt_rng_device_add(void)
@ -1387,6 +1392,8 @@ static int zcrypt_rng_device_add(void)
goto out; goto out;
} }
zcrypt_rng_buffer_index = 0; zcrypt_rng_buffer_index = 0;
if (!zcrypt_hwrng_seed)
zcrypt_rng_dev.quality = 0;
rc = hwrng_register(&zcrypt_rng_dev); rc = hwrng_register(&zcrypt_rng_dev);
if (rc) if (rc)
goto out_free; goto out_free;