* [PATCH v3 1/4] drivers: add simple hw_random implementation
2017-03-17 15:46 [PATCH v3 0/4] upstream hwrng framework Oleksij Rempel
@ 2017-03-17 15:46 ` Oleksij Rempel
2017-03-17 15:46 ` [PATCH v3 2/4] lib: random: get_random_bytes from HWRNG if present Oleksij Rempel
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Oleksij Rempel @ 2017-03-17 15:46 UTC (permalink / raw)
To: barebox; +Cc: Oleksij Rempel, Steffen Trumtrar
From: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Add a simple hw_random implementation based on code from
Linux v4.5-rc5.
All the entropypool initialization stuff is left out and
the obsolete data_read/data_present calls are omitted.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
drivers/Kconfig | 1 +
drivers/Makefile | 1 +
drivers/hw_random/Kconfig | 6 +++
drivers/hw_random/Makefile | 1 +
drivers/hw_random/core.c | 108 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/hw_random.h | 43 ++++++++++++++++++
6 files changed, 160 insertions(+)
create mode 100644 drivers/hw_random/Kconfig
create mode 100644 drivers/hw_random/Makefile
create mode 100644 drivers/hw_random/core.c
create mode 100644 include/linux/hw_random.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index cc086ac2d..2f5784a4d 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -21,6 +21,7 @@ source "drivers/eeprom/Kconfig"
source "drivers/input/Kconfig"
source "drivers/watchdog/Kconfig"
source "drivers/pwm/Kconfig"
+source "drivers/hw_random/Kconfig"
source "drivers/dma/Kconfig"
source "drivers/gpio/Kconfig"
source "drivers/w1/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 6a70f6ee1..7e9b80e59 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -20,6 +20,7 @@ obj-y += misc/
obj-y += dma/
obj-y += watchdog/
obj-y += gpio/
+obj-$(CONFIG_HWRNG) += hw_random/
obj-$(CONFIG_OFTREE) += of/
obj-$(CONFIG_W1) += w1/
obj-y += pinctrl/
diff --git a/drivers/hw_random/Kconfig b/drivers/hw_random/Kconfig
new file mode 100644
index 000000000..807fcadd3
--- /dev/null
+++ b/drivers/hw_random/Kconfig
@@ -0,0 +1,6 @@
+menuconfig HWRNG
+ bool "HWRNG Support"
+ help
+ Support for HWRNG(Hardware Random Number Generator) devices.
+
+ If unsure, say no.
diff --git a/drivers/hw_random/Makefile b/drivers/hw_random/Makefile
new file mode 100644
index 000000000..15307b100
--- /dev/null
+++ b/drivers/hw_random/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_HWRNG) += core.o
diff --git a/drivers/hw_random/core.c b/drivers/hw_random/core.c
new file mode 100644
index 000000000..2991f58c3
--- /dev/null
+++ b/drivers/hw_random/core.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2016 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de>
+ *
+ * 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.
+ *
+ * derived from Linux kernel drivers/char/hw_random/core.c
+ */
+
+#include <common.h>
+#include <linux/hw_random.h>
+#include <malloc.h>
+
+static LIST_HEAD(hwrngs);
+
+#define RNG_BUFFER_SIZE 32
+
+int hwrng_get_data(struct hwrng *rng, void *buffer, size_t size, int wait)
+{
+ return rng->read(rng, buffer, size, wait);
+}
+
+static int hwrng_init(struct hwrng *rng)
+{
+ int ret = 0;
+
+ if (rng->init)
+ ret = rng->init(rng);
+
+ if (!ret)
+ list_add_tail(&rng->list, &hwrngs);
+
+ return ret;
+}
+
+static ssize_t rng_dev_read(struct cdev *cdev, void *buf, size_t size,
+ loff_t offset, unsigned long flags)
+{
+ struct hwrng *rng = container_of(cdev, struct hwrng, cdev);
+ size_t count = size;
+ ssize_t cur = 0;
+ int len;
+
+ memset(buf, 0, size);
+
+ while (count) {
+ int max = min(count, (size_t)RNG_BUFFER_SIZE);
+ len = hwrng_get_data(rng, rng->buf, max, true);
+ if (len < 0) {
+ cur = len;
+ break;
+ }
+
+ memcpy(buf + cur, rng->buf, len);
+
+ count -= len;
+ cur += len;
+ }
+
+ return cur;
+}
+
+static struct file_operations rng_chrdev_ops = {
+ .read = rng_dev_read,
+ .lseek = dev_lseek_default,
+};
+
+static int hwrng_register_cdev(struct hwrng *rng)
+{
+ rng->cdev.name = "hwrng";
+ rng->cdev.flags = DEVFS_IS_CHARACTER_DEV;
+ rng->cdev.ops = &rng_chrdev_ops;
+ rng->cdev.dev = rng->dev;
+
+ return devfs_create(&rng->cdev);
+}
+
+struct hwrng *hwrng_get_first(void)
+{
+ if (list_empty(&hwrngs))
+ return ERR_PTR(-ENODEV);
+ else
+ return list_first_entry(&hwrngs, struct hwrng, list);
+}
+
+int hwrng_register(struct device_d *dev, struct hwrng *rng)
+{
+ int err;
+
+ if (rng->name == NULL || rng->read == NULL)
+ return -EINVAL;
+
+ rng->buf = xzalloc(RNG_BUFFER_SIZE);
+ rng->dev = dev;
+
+ err = hwrng_init(rng);
+ if (err) {
+ free(rng->buf);
+ return err;
+ }
+
+ err = hwrng_register_cdev(rng);
+ if (err)
+ free(rng->buf);
+
+ return err;
+}
diff --git a/include/linux/hw_random.h b/include/linux/hw_random.h
new file mode 100644
index 000000000..299a717dd
--- /dev/null
+++ b/include/linux/hw_random.h
@@ -0,0 +1,43 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * 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.
+ */
+
+#ifndef LINUX_HWRANDOM_H_
+#define LINUX_HWRANDOM_H_
+
+#include <linux/list.h>
+
+/**
+ * struct hwrng - Hardware Random Number Generator driver
+ * @name: Unique RNG name.
+ * @init: Initialization callback (can be NULL).
+ * @read: New API. drivers can fill up to max bytes of data
+ * into the buffer. The buffer is aligned for any type.
+ * @priv: Private data, for use by the RNG driver.
+ */
+struct hwrng {
+ const char *name;
+ int (*init)(struct hwrng *rng);
+ int (*read)(struct hwrng *rng, void *data, size_t max, bool wait);
+
+ struct list_head list;
+
+ struct cdev cdev;
+ struct device_d *dev;
+ void *buf;
+};
+
+/* Register a new Hardware Random Number Generator driver. */
+int hwrng_register(struct device_d *dev, struct hwrng *rng);
+struct hwrng *hwrng_get_first(void);
+int hwrng_get_data(struct hwrng *rng, void *buffer, size_t size, int wait);
+
+#endif /* LINUX_HWRANDOM_H_ */
--
2.11.0
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^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH v3 2/4] lib: random: get_random_bytes from HWRNG if present
2017-03-17 15:46 [PATCH v3 0/4] upstream hwrng framework Oleksij Rempel
2017-03-17 15:46 ` [PATCH v3 1/4] drivers: add simple hw_random implementation Oleksij Rempel
@ 2017-03-17 15:46 ` Oleksij Rempel
2017-03-17 15:46 ` [PATCH v3 3/4] caamrng: port to hwrng framework Oleksij Rempel
2017-03-17 15:46 ` [PATCH v3 4/4] fs: add random device Oleksij Rempel
3 siblings, 0 replies; 5+ messages in thread
From: Oleksij Rempel @ 2017-03-17 15:46 UTC (permalink / raw)
To: barebox; +Cc: Oleksij Rempel, Steffen Trumtrar
From: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Instead of generating pseudo random numbers, get random bytes
from an optional HW generator, if enabled and registered.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
lib/random.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/lib/random.c b/lib/random.c
index 210fea994..5cd40915a 100644
--- a/lib/random.c
+++ b/lib/random.c
@@ -1,5 +1,6 @@
#include <common.h>
#include <stdlib.h>
+#include <linux/hw_random.h>
static unsigned int random_seed;
@@ -22,6 +23,23 @@ void get_random_bytes(void *_buf, int len)
{
char *buf = _buf;
+ if (IS_ENABLED(CONFIG_HWRNG)) {
+ struct hwrng *rng;
+
+ rng = hwrng_get_first();
+ if (!IS_ERR(rng)) {
+ while (len) {
+ int bytes = hwrng_get_data(rng, _buf, len, true);
+ if (bytes <= 0)
+ goto sw_fallback;
+ len -= bytes;
+ }
+
+ return;
+ }
+ }
+
+sw_fallback:
while (len--)
*buf++ = rand() % 256;
}
--
2.11.0
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^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH v3 3/4] caamrng: port to hwrng framework
2017-03-17 15:46 [PATCH v3 0/4] upstream hwrng framework Oleksij Rempel
2017-03-17 15:46 ` [PATCH v3 1/4] drivers: add simple hw_random implementation Oleksij Rempel
2017-03-17 15:46 ` [PATCH v3 2/4] lib: random: get_random_bytes from HWRNG if present Oleksij Rempel
@ 2017-03-17 15:46 ` Oleksij Rempel
2017-03-17 15:46 ` [PATCH v3 4/4] fs: add random device Oleksij Rempel
3 siblings, 0 replies; 5+ messages in thread
From: Oleksij Rempel @ 2017-03-17 15:46 UTC (permalink / raw)
To: barebox; +Cc: Oleksij Rempel
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
drivers/crypto/caam/Kconfig | 1 +
drivers/crypto/caam/caamrng.c | 40 ++++++++++++----------------------------
2 files changed, 13 insertions(+), 28 deletions(-)
diff --git a/drivers/crypto/caam/Kconfig b/drivers/crypto/caam/Kconfig
index cf05d1c07..2ab509d11 100644
--- a/drivers/crypto/caam/Kconfig
+++ b/drivers/crypto/caam/Kconfig
@@ -29,6 +29,7 @@ config CRYPTO_DEV_FSL_CAAM_RINGSIZE
config CRYPTO_DEV_FSL_CAAM_RNG
bool "Register caam RNG device"
depends on CRYPTO_DEV_FSL_CAAM
+ depends on HWRNG
default y
help
Selecting this will register the SEC4 hardware rng.
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index 0fef171a2..aabad0416 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -35,6 +35,7 @@
#include <driver.h>
#include <init.h>
#include <linux/spinlock.h>
+#include <linux/hw_random.h>
#include "regs.h"
#include "intern.h"
@@ -71,7 +72,7 @@ struct caam_rng_ctx {
unsigned int cur_buf_idx;
int current_buf;
struct buf_data bufs[2];
- struct cdev cdev;
+ struct hwrng rng;
};
static struct caam_rng_ctx *rng_ctx;
@@ -116,8 +117,9 @@ static inline int submit_job(struct caam_rng_ctx *ctx, int to_current)
return err;
}
-static int caam_read(struct caam_rng_ctx *ctx, void *data, size_t max, bool wait)
+static int caam_read(struct hwrng *rng, void *data, size_t max, bool wait)
{
+ struct caam_rng_ctx *ctx = container_of(rng, struct caam_rng_ctx, rng);
struct buf_data *bd = &ctx->bufs[ctx->current_buf];
int next_buf_idx, copied_idx;
int err;
@@ -162,7 +164,7 @@ static int caam_read(struct caam_rng_ctx *ctx, void *data, size_t max, bool wait
dev_dbg(ctx->jrdev, "switched to buffer %d\n", ctx->current_buf);
/* since there already is some data read, don't wait */
- return copied_idx + caam_read(ctx, data + copied_idx,
+ return copied_idx + caam_read(rng, data + copied_idx,
max - copied_idx, false);
}
@@ -248,29 +250,6 @@ static int caam_init_rng(struct caam_rng_ctx *ctx, struct device_d *jrdev)
return 0;
}
-static ssize_t random_read(struct cdev *cdev, void *buf, size_t count,
- loff_t offset, ulong flags)
-{
- struct caam_rng_ctx *ctx = container_of(cdev, struct caam_rng_ctx, cdev);
-
- return caam_read(ctx, buf, count, true);
-}
-
-static struct file_operations randomops = {
- .read = random_read,
- .lseek = dev_lseek_default,
-};
-
-static int caam_init_devrandom(struct caam_rng_ctx *ctx, struct device_d *dev)
-{
- ctx->cdev.name = "hwrng";
- ctx->cdev.flags = DEVFS_IS_CHARACTER_DEV;
- ctx->cdev.ops = &randomops;
- ctx->cdev.dev = dev;
-
- return devfs_create(&ctx->cdev);
-}
-
int caam_rng_probe(struct device_d *dev, struct device_d *jrdev)
{
int err;
@@ -281,9 +260,14 @@ int caam_rng_probe(struct device_d *dev, struct device_d *jrdev)
if (err)
return err;
- err = caam_init_devrandom(rng_ctx, dev);
- if (err)
+ rng_ctx->rng.name = dev->name;
+ rng_ctx->rng.read = caam_read;
+
+ err = hwrng_register(dev, &rng_ctx->rng);
+ if (err) {
+ dev_err(dev, "rng-caam registering failed (%d)\n", err);
return err;
+ }
dev_info(dev, "registering rng-caam\n");
--
2.11.0
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^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH v3 4/4] fs: add random device
2017-03-17 15:46 [PATCH v3 0/4] upstream hwrng framework Oleksij Rempel
` (2 preceding siblings ...)
2017-03-17 15:46 ` [PATCH v3 3/4] caamrng: port to hwrng framework Oleksij Rempel
@ 2017-03-17 15:46 ` Oleksij Rempel
3 siblings, 0 replies; 5+ messages in thread
From: Oleksij Rempel @ 2017-03-17 15:46 UTC (permalink / raw)
To: barebox; +Cc: Oleksij Rempel
this should provide easy access to get_random_bytes() interfaces.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
commands/stddev.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/commands/stddev.c b/commands/stddev.c
index 318d05741..99d60e5de 100644
--- a/commands/stddev.c
+++ b/commands/stddev.c
@@ -17,6 +17,7 @@
#include <common.h>
#include <init.h>
+#include <stdlib.h>
static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
{
@@ -100,3 +101,31 @@ static int null_init(void)
}
device_initcall(null_init);
+
+static ssize_t random_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
+{
+ get_random_bytes(buf, count);
+ return count;
+}
+
+static struct file_operations randomops = {
+ .read = random_read,
+ .lseek = dev_lseek_default,
+};
+
+static int random_init(void)
+{
+ struct cdev *cdev;
+
+ cdev = xzalloc(sizeof (*cdev));
+
+ cdev->name = "random";
+ cdev->flags = DEVFS_IS_CHARACTER_DEV;
+ cdev->ops = &randomops;
+
+ devfs_create(cdev);
+
+ return 0;
+}
+
+device_initcall(random_init);
--
2.11.0
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^ permalink raw reply [flat|nested] 5+ messages in thread