| Message ID | 20250327021809.29954-4-zhaoqunqin@loongson.cn (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Drivers for Loongson security engine | expand |
Hi, Qunqin, On Thu, Mar 27, 2025 at 10:17 AM Qunqin Zhao <zhaoqunqin@loongson.cn> wrote: > > Loongson's Random Number Generator is found inside Loongson security > engine. > > Co-developed-by: Yinggang Gu <guyinggang@loongson.cn> > Signed-off-by: Yinggang Gu <guyinggang@loongson.cn> > Signed-off-by: Qunqin Zhao <zhaoqunqin@loongson.cn> > --- > v6: Replace all "ls6000se" with "loongson" > v2-v5: None > > drivers/crypto/Kconfig | 1 + > drivers/crypto/Makefile | 1 + > drivers/crypto/loongson/Kconfig | 6 + > drivers/crypto/loongson/Makefile | 2 + > drivers/crypto/loongson/loongson-rng.c | 190 +++++++++++++++++++++++++ > 5 files changed, 200 insertions(+) > create mode 100644 drivers/crypto/loongson/Kconfig > create mode 100644 drivers/crypto/loongson/Makefile > create mode 100644 drivers/crypto/loongson/loongson-rng.c > > diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig > index 19ab145f9..567ed81b0 100644 > --- a/drivers/crypto/Kconfig > +++ b/drivers/crypto/Kconfig > @@ -855,5 +855,6 @@ config CRYPTO_DEV_SA2UL > > source "drivers/crypto/aspeed/Kconfig" > source "drivers/crypto/starfive/Kconfig" > +source "drivers/crypto/loongson/Kconfig" > > endif # CRYPTO_HW > diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile > index fef18ffdb..643c3710b 100644 > --- a/drivers/crypto/Makefile > +++ b/drivers/crypto/Makefile > @@ -50,3 +50,4 @@ obj-y += hisilicon/ > obj-$(CONFIG_CRYPTO_DEV_AMLOGIC_GXL) += amlogic/ > obj-y += intel/ > obj-y += starfive/ > +obj-y += loongson/ > diff --git a/drivers/crypto/loongson/Kconfig b/drivers/crypto/loongson/Kconfig > new file mode 100644 > index 000000000..4368701ad > --- /dev/null > +++ b/drivers/crypto/loongson/Kconfig > @@ -0,0 +1,6 @@ > +# SPDX-License-Identifier: GPL-2.0 > +config CRYPTO_DEV_LOONGSON_RNG > + tristate "Support for Loongson RNG Driver" > + depends on MFD_LOONGSON_SE > + help > + Support for Loongson RNG Driver. > diff --git a/drivers/crypto/loongson/Makefile b/drivers/crypto/loongson/Makefile > new file mode 100644 > index 000000000..b8b013c86 > --- /dev/null > +++ b/drivers/crypto/loongson/Makefile > @@ -0,0 +1,2 @@ > +# SPDX-License-Identifier: GPL-2.0 > +obj-$(CONFIG_CRYPTO_DEV_LOONGSON_RNG) += loongson-rng.o > diff --git a/drivers/crypto/loongson/loongson-rng.c b/drivers/crypto/loongson/loongson-rng.c > new file mode 100644 > index 000000000..c80346cf7 > --- /dev/null > +++ b/drivers/crypto/loongson/loongson-rng.c > @@ -0,0 +1,190 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* Copyright (c) 2019 HiSilicon Limited. */ > +/* Copyright (c) 2025 Loongson Technology Corporation Limited. */ > + > +#include <linux/crypto.h> > +#include <linux/err.h> > +#include <linux/hw_random.h> > +#include <linux/io.h> > +#include <linux/iopoll.h> > +#include <linux/kernel.h> > +#include <linux/list.h> > +#include <linux/mfd/loongson-se.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/platform_device.h> > +#include <linux/random.h> > +#include <crypto/internal/rng.h> > + > +struct lsrng_list { > + struct mutex lock; > + struct list_head list; > + int is_init; > +}; For all data struct and function name, it is better to change the lsrng_ prefix to loongson_rng_ which matches the file name. Huacai > + > +struct lsrng { > + bool is_used; > + struct lsse_ch *se_ch; > + struct list_head list; > + struct completion rng_completion; > +}; > + > +struct lsrng_ctx { > + struct lsrng *rng; > +}; > + > +struct rng_msg { > + u32 cmd; > + union { > + u32 len; > + u32 ret; > + } u; > + u32 resved; > + u32 out_off; > + u32 pad[4]; > +}; > + > +static atomic_t rng_active_devs; > +static struct lsrng_list rng_devices; > + > +static void lsrng_complete(struct lsse_ch *ch) > +{ > + struct lsrng *rng = (struct lsrng *)ch->priv; > + > + complete(&rng->rng_completion); > +} > + > +static int lsrng_generate(struct crypto_rng *tfm, const u8 *src, > + unsigned int slen, u8 *dstn, unsigned int dlen) > +{ > + struct lsrng_ctx *ctx = crypto_rng_ctx(tfm); > + struct lsrng *rng = ctx->rng; > + struct rng_msg *msg; > + int err, len; > + > + do { > + len = min(dlen, PAGE_SIZE); > + msg = rng->se_ch->smsg; > + msg->u.len = len; > + err = se_send_ch_requeset(rng->se_ch); > + if (err) > + return err; > + > + wait_for_completion_interruptible(&rng->rng_completion); > + > + msg = rng->se_ch->rmsg; > + if (msg->u.ret) > + return -EFAULT; > + > + memcpy(dstn, rng->se_ch->data_buffer, len); > + dlen -= len; > + dstn += len; > + } while (dlen > 0); > + > + return 0; > +} > + > +static int lsrng_init(struct crypto_tfm *tfm) > +{ > + struct lsrng_ctx *ctx = crypto_tfm_ctx(tfm); > + struct lsrng *rng; > + int ret = -EBUSY; > + > + mutex_lock(&rng_devices.lock); > + list_for_each_entry(rng, &rng_devices.list, list) { > + if (!rng->is_used) { > + rng->is_used = true; > + ctx->rng = rng; > + ret = 0; > + break; > + } > + } > + mutex_unlock(&rng_devices.lock); > + > + return ret; > +} > + > +static void lsrng_exit(struct crypto_tfm *tfm) > +{ > + struct lsrng_ctx *ctx = crypto_tfm_ctx(tfm); > + > + mutex_lock(&rng_devices.lock); > + ctx->rng->is_used = false; > + mutex_unlock(&rng_devices.lock); > +} > + > +static int no_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) > +{ > + return 0; > +} > + > +static struct rng_alg lsrng_alg = { > + .generate = lsrng_generate, > + .seed = no_seed, > + .base = { > + .cra_name = "stdrng", > + .cra_driver_name = "loongson_stdrng", > + .cra_priority = 300, > + .cra_ctxsize = sizeof(struct lsrng_ctx), > + .cra_module = THIS_MODULE, > + .cra_init = lsrng_init, > + .cra_exit = lsrng_exit, > + }, > +}; > + > +static void lsrng_add_to_list(struct lsrng *rng) > +{ > + mutex_lock(&rng_devices.lock); > + list_add_tail(&rng->list, &rng_devices.list); > + mutex_unlock(&rng_devices.lock); > +} > + > +static int lsrng_probe(struct platform_device *pdev) > +{ > + struct rng_msg *msg; > + struct lsrng *rng; > + int ret; > + > + rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL); > + if (!rng) > + return -ENOMEM; > + > + init_completion(&rng->rng_completion); > + rng->se_ch = se_init_ch(pdev->dev.parent, SE_CH_RNG, PAGE_SIZE, > + sizeof(struct rng_msg) * 2, rng, lsrng_complete); > + if (!rng->se_ch) > + return -ENODEV; > + msg = rng->se_ch->smsg; > + msg->cmd = SE_CMD_RNG; > + msg->out_off = rng->se_ch->off; > + > + if (!rng_devices.is_init) { > + ret = crypto_register_rng(&lsrng_alg); > + if (ret) { > + dev_err(&pdev->dev, "failed to register crypto(%d)\n", ret); > + return ret; > + } > + INIT_LIST_HEAD(&rng_devices.list); > + mutex_init(&rng_devices.lock); > + rng_devices.is_init = true; > + } > + > + lsrng_add_to_list(rng); > + atomic_inc(&rng_active_devs); > + > + return 0; > +} > + > +static struct platform_driver lsrng_driver = { > + .probe = lsrng_probe, > + .driver = { > + .name = "loongson-rng", > + }, > +}; > +module_platform_driver(lsrng_driver); > + > +MODULE_ALIAS("platform:loongson-rng"); > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Yinggang Gu <guyinggang@loongson.cn>"); > +MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@loongson.cn>"); > +MODULE_DESCRIPTION("Loongson random number generator driver"); > -- > 2.45.2 > >
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig index 19ab145f9..567ed81b0 100644 --- a/drivers/crypto/Kconfig +++ b/drivers/crypto/Kconfig @@ -855,5 +855,6 @@ config CRYPTO_DEV_SA2UL source "drivers/crypto/aspeed/Kconfig" source "drivers/crypto/starfive/Kconfig" +source "drivers/crypto/loongson/Kconfig" endif # CRYPTO_HW diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile index fef18ffdb..643c3710b 100644 --- a/drivers/crypto/Makefile +++ b/drivers/crypto/Makefile @@ -50,3 +50,4 @@ obj-y += hisilicon/ obj-$(CONFIG_CRYPTO_DEV_AMLOGIC_GXL) += amlogic/ obj-y += intel/ obj-y += starfive/ +obj-y += loongson/ diff --git a/drivers/crypto/loongson/Kconfig b/drivers/crypto/loongson/Kconfig new file mode 100644 index 000000000..4368701ad --- /dev/null +++ b/drivers/crypto/loongson/Kconfig @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 +config CRYPTO_DEV_LOONGSON_RNG + tristate "Support for Loongson RNG Driver" + depends on MFD_LOONGSON_SE + help + Support for Loongson RNG Driver. diff --git a/drivers/crypto/loongson/Makefile b/drivers/crypto/loongson/Makefile new file mode 100644 index 000000000..b8b013c86 --- /dev/null +++ b/drivers/crypto/loongson/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_CRYPTO_DEV_LOONGSON_RNG) += loongson-rng.o diff --git a/drivers/crypto/loongson/loongson-rng.c b/drivers/crypto/loongson/loongson-rng.c new file mode 100644 index 000000000..c80346cf7 --- /dev/null +++ b/drivers/crypto/loongson/loongson-rng.c @@ -0,0 +1,190 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 HiSilicon Limited. */ +/* Copyright (c) 2025 Loongson Technology Corporation Limited. */ + +#include <linux/crypto.h> +#include <linux/err.h> +#include <linux/hw_random.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/mfd/loongson-se.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/random.h> +#include <crypto/internal/rng.h> + +struct lsrng_list { + struct mutex lock; + struct list_head list; + int is_init; +}; + +struct lsrng { + bool is_used; + struct lsse_ch *se_ch; + struct list_head list; + struct completion rng_completion; +}; + +struct lsrng_ctx { + struct lsrng *rng; +}; + +struct rng_msg { + u32 cmd; + union { + u32 len; + u32 ret; + } u; + u32 resved; + u32 out_off; + u32 pad[4]; +}; + +static atomic_t rng_active_devs; +static struct lsrng_list rng_devices; + +static void lsrng_complete(struct lsse_ch *ch) +{ + struct lsrng *rng = (struct lsrng *)ch->priv; + + complete(&rng->rng_completion); +} + +static int lsrng_generate(struct crypto_rng *tfm, const u8 *src, + unsigned int slen, u8 *dstn, unsigned int dlen) +{ + struct lsrng_ctx *ctx = crypto_rng_ctx(tfm); + struct lsrng *rng = ctx->rng; + struct rng_msg *msg; + int err, len; + + do { + len = min(dlen, PAGE_SIZE); + msg = rng->se_ch->smsg; + msg->u.len = len; + err = se_send_ch_requeset(rng->se_ch); + if (err) + return err; + + wait_for_completion_interruptible(&rng->rng_completion); + + msg = rng->se_ch->rmsg; + if (msg->u.ret) + return -EFAULT; + + memcpy(dstn, rng->se_ch->data_buffer, len); + dlen -= len; + dstn += len; + } while (dlen > 0); + + return 0; +} + +static int lsrng_init(struct crypto_tfm *tfm) +{ + struct lsrng_ctx *ctx = crypto_tfm_ctx(tfm); + struct lsrng *rng; + int ret = -EBUSY; + + mutex_lock(&rng_devices.lock); + list_for_each_entry(rng, &rng_devices.list, list) { + if (!rng->is_used) { + rng->is_used = true; + ctx->rng = rng; + ret = 0; + break; + } + } + mutex_unlock(&rng_devices.lock); + + return ret; +} + +static void lsrng_exit(struct crypto_tfm *tfm) +{ + struct lsrng_ctx *ctx = crypto_tfm_ctx(tfm); + + mutex_lock(&rng_devices.lock); + ctx->rng->is_used = false; + mutex_unlock(&rng_devices.lock); +} + +static int no_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) +{ + return 0; +} + +static struct rng_alg lsrng_alg = { + .generate = lsrng_generate, + .seed = no_seed, + .base = { + .cra_name = "stdrng", + .cra_driver_name = "loongson_stdrng", + .cra_priority = 300, + .cra_ctxsize = sizeof(struct lsrng_ctx), + .cra_module = THIS_MODULE, + .cra_init = lsrng_init, + .cra_exit = lsrng_exit, + }, +}; + +static void lsrng_add_to_list(struct lsrng *rng) +{ + mutex_lock(&rng_devices.lock); + list_add_tail(&rng->list, &rng_devices.list); + mutex_unlock(&rng_devices.lock); +} + +static int lsrng_probe(struct platform_device *pdev) +{ + struct rng_msg *msg; + struct lsrng *rng; + int ret; + + rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL); + if (!rng) + return -ENOMEM; + + init_completion(&rng->rng_completion); + rng->se_ch = se_init_ch(pdev->dev.parent, SE_CH_RNG, PAGE_SIZE, + sizeof(struct rng_msg) * 2, rng, lsrng_complete); + if (!rng->se_ch) + return -ENODEV; + msg = rng->se_ch->smsg; + msg->cmd = SE_CMD_RNG; + msg->out_off = rng->se_ch->off; + + if (!rng_devices.is_init) { + ret = crypto_register_rng(&lsrng_alg); + if (ret) { + dev_err(&pdev->dev, "failed to register crypto(%d)\n", ret); + return ret; + } + INIT_LIST_HEAD(&rng_devices.list); + mutex_init(&rng_devices.lock); + rng_devices.is_init = true; + } + + lsrng_add_to_list(rng); + atomic_inc(&rng_active_devs); + + return 0; +} + +static struct platform_driver lsrng_driver = { + .probe = lsrng_probe, + .driver = { + .name = "loongson-rng", + }, +}; +module_platform_driver(lsrng_driver); + +MODULE_ALIAS("platform:loongson-rng"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Yinggang Gu <guyinggang@loongson.cn>"); +MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@loongson.cn>"); +MODULE_DESCRIPTION("Loongson random number generator driver");