diff options
Diffstat (limited to 'drivers/char/hw_random/pseries-rng.c')
| -rw-r--r-- | drivers/char/hw_random/pseries-rng.c | 50 |
1 files changed, 23 insertions, 27 deletions
diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c index 5f1197929f0c..62bdd5af1339 100644 --- a/drivers/char/hw_random/pseries-rng.c +++ b/drivers/char/hw_random/pseries-rng.c @@ -1,38 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2010 Michael Neuling IBM Corporation * * Driver for the pseries hardware RNG for POWER7+ and above - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> #include <linux/module.h> #include <linux/hw_random.h> #include <asm/vio.h> -#define MODULE_NAME "pseries-rng" -static int pseries_rng_data_read(struct hwrng *rng, u32 *data) +static int pseries_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) { - if (plpar_hcall(H_RANDOM, (unsigned long *)data) != H_SUCCESS) { - printk(KERN_ERR "pseries rng hcall error\n"); - return 0; + u64 buffer[PLPAR_HCALL_BUFSIZE]; + int rc; + + rc = plpar_hcall(H_RANDOM, (unsigned long *)buffer); + if (rc != H_SUCCESS) { + pr_err_ratelimited("H_RANDOM call failed %d\n", rc); + return -EIO; } + memcpy(data, buffer, 8); + + /* The hypervisor interface returns 64 bits */ return 8; } -/** +/* * pseries_rng_get_desired_dma - Return desired DMA allocate for CMO operations * * This is a required function for a driver to operate in a CMO environment @@ -47,30 +44,29 @@ static unsigned long pseries_rng_get_desired_dma(struct vio_dev *vdev) }; static struct hwrng pseries_rng = { - .name = MODULE_NAME, - .data_read = pseries_rng_data_read, + .name = KBUILD_MODNAME, + .read = pseries_rng_read, }; -static int __init pseries_rng_probe(struct vio_dev *dev, +static int pseries_rng_probe(struct vio_dev *dev, const struct vio_device_id *id) { return hwrng_register(&pseries_rng); } -static int __exit pseries_rng_remove(struct vio_dev *dev) +static void pseries_rng_remove(struct vio_dev *dev) { hwrng_unregister(&pseries_rng); - return 0; } -static struct vio_device_id pseries_rng_driver_ids[] = { +static const struct vio_device_id pseries_rng_driver_ids[] = { { "ibm,random-v1", "ibm,random"}, { "", "" } }; MODULE_DEVICE_TABLE(vio, pseries_rng_driver_ids); static struct vio_driver pseries_rng_driver = { - .name = MODULE_NAME, + .name = KBUILD_MODNAME, .probe = pseries_rng_probe, .remove = pseries_rng_remove, .get_desired_dma = pseries_rng_get_desired_dma, @@ -79,7 +75,7 @@ static struct vio_driver pseries_rng_driver = { static int __init rng_init(void) { - printk(KERN_INFO "Registering IBM pSeries RNG driver\n"); + pr_info("Registering IBM pSeries RNG driver\n"); return vio_register_driver(&pseries_rng_driver); } |