From f146c7bc85a51f95c05e0f8173d484eb301ece78 Mon Sep 17 00:00:00 2001 From: Danilo Krummrich Date: Thu, 13 Aug 2026 18:52:04 +0200 Subject: PCI: Add pci_irq_type() to query the allocated interrupt type Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX based on the interrupt type the PCI core selected after pci_alloc_irq_vectors(). Several drivers already open-code this check against pdev->msix_enabled and pdev->msi_enabled, or even open code this helper [1]. A common helper avoids the duplication and keeps drivers from accessing the bitfield directly (see also [2]). Acked-by: Bjorn Helgaas Tested-by: John Hubbard Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1] Inspired-by: John Hubbard Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2] Reviewed-by: Gary Guo Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org [ Add missing pci_irq_type() stub for CONFIG_PCI=n. ] Signed-off-by: Danilo Krummrich --- crypto/rng.c | 245 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 245 insertions(+) create mode 100644 crypto/rng.c (limited to 'crypto/rng.c') diff --git a/crypto/rng.c b/crypto/rng.c new file mode 100644 index 000000000..828b0d807 --- /dev/null +++ b/crypto/rng.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cryptographic API. + * + * RNG operations. + * + * Copyright (c) 2008 Neil Horman + * Copyright (c) 2015 Herbert Xu + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +static DEFINE_MUTEX(crypto_default_rng_lock); +static struct crypto_rng *crypto_default_rng; +static int crypto_default_rng_refcnt; + +int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) +{ + u8 *buf = NULL; + int err; + + if (!seed && slen) { + buf = kmalloc(slen, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + err = get_random_bytes_wait(buf, slen); + if (err) + goto out; + seed = buf; + } + + err = crypto_rng_alg(tfm)->seed(tfm, seed, slen); +out: + kfree_sensitive(buf); + return err; +} +EXPORT_SYMBOL_GPL(crypto_rng_reset); + +static int crypto_rng_init_tfm(struct crypto_tfm *tfm) +{ + return 0; +} + +static unsigned int seedsize(struct crypto_alg *alg) +{ + struct rng_alg *ralg = container_of(alg, struct rng_alg, base); + + return ralg->seedsize; +} + +static int __maybe_unused crypto_rng_report( + struct sk_buff *skb, struct crypto_alg *alg) +{ + struct crypto_report_rng rrng = { + .type = "rng", + }; + + rrng.seedsize = seedsize(alg); + + return nla_put(skb, CRYPTOCFGA_REPORT_RNG, sizeof(rrng), &rrng); +} + +static void __maybe_unused crypto_rng_show(struct seq_file *m, + struct crypto_alg *alg) +{ + seq_printf(m, "type : rng\n"); + seq_printf(m, "seedsize : %u\n", seedsize(alg)); +} + +static const struct crypto_type crypto_rng_type = { + .extsize = crypto_alg_extsize, + .init_tfm = crypto_rng_init_tfm, +#ifdef CONFIG_PROC_FS + .show = crypto_rng_show, +#endif +#if IS_ENABLED(CONFIG_CRYPTO_USER) + .report = crypto_rng_report, +#endif + .maskclear = ~CRYPTO_ALG_TYPE_MASK, + .maskset = CRYPTO_ALG_TYPE_MASK, + .type = CRYPTO_ALG_TYPE_RNG, + .tfmsize = offsetof(struct crypto_rng, base), + .algsize = offsetof(struct rng_alg, base), +}; + +struct crypto_rng *crypto_alloc_rng(const char *alg_name, u32 type, u32 mask) +{ + return crypto_alloc_tfm(alg_name, &crypto_rng_type, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_alloc_rng); + +static int crypto_get_default_rng(void) +{ + struct crypto_rng *rng; + int err; + + mutex_lock(&crypto_default_rng_lock); + if (!crypto_default_rng) { + rng = crypto_alloc_rng("stdrng", 0, 0); + err = PTR_ERR(rng); + if (IS_ERR(rng)) + goto unlock; + + err = crypto_rng_reset(rng, NULL, crypto_rng_seedsize(rng)); + if (err) { + crypto_free_rng(rng); + goto unlock; + } + + crypto_default_rng = rng; + } + + crypto_default_rng_refcnt++; + err = 0; + +unlock: + mutex_unlock(&crypto_default_rng_lock); + + return err; +} + +static void crypto_put_default_rng(void) +{ + mutex_lock(&crypto_default_rng_lock); + crypto_default_rng_refcnt--; + mutex_unlock(&crypto_default_rng_lock); +} + +int __crypto_stdrng_get_bytes(void *buf, unsigned int len) +{ + int err; + + err = crypto_get_default_rng(); + if (err) + return err; + + err = crypto_rng_get_bytes(crypto_default_rng, buf, len); + crypto_put_default_rng(); + return err; +} +EXPORT_SYMBOL_GPL(__crypto_stdrng_get_bytes); + +#if defined(CONFIG_CRYPTO_RNG) || defined(CONFIG_CRYPTO_RNG_MODULE) +int crypto_del_default_rng(void) +{ + int err = -EBUSY; + + mutex_lock(&crypto_default_rng_lock); + if (crypto_default_rng_refcnt) + goto out; + + crypto_free_rng(crypto_default_rng); + crypto_default_rng = NULL; + + err = 0; + +out: + mutex_unlock(&crypto_default_rng_lock); + + return err; +} +EXPORT_SYMBOL_GPL(crypto_del_default_rng); +#endif + +static void rng_default_set_ent(struct crypto_rng *tfm, const u8 *data, + unsigned int len) +{ +} + +int crypto_register_rng(struct rng_alg *alg) +{ + struct crypto_alg *base = &alg->base; + + if (alg->seedsize > PAGE_SIZE / 8) + return -EINVAL; + + base->cra_type = &crypto_rng_type; + base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; + base->cra_flags |= CRYPTO_ALG_TYPE_RNG; + + if (!alg->set_ent) + alg->set_ent = rng_default_set_ent; + + return crypto_register_alg(base); +} +EXPORT_SYMBOL_GPL(crypto_register_rng); + +void crypto_unregister_rng(struct rng_alg *alg) +{ + crypto_unregister_alg(&alg->base); +} +EXPORT_SYMBOL_GPL(crypto_unregister_rng); + +int crypto_register_rngs(struct rng_alg *algs, int count) +{ + int i, ret; + + for (i = 0; i < count; i++) { + ret = crypto_register_rng(algs + i); + if (ret) { + crypto_unregister_rngs(algs, i); + return ret; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(crypto_register_rngs); + +void crypto_unregister_rngs(struct rng_alg *algs, int count) +{ + int i; + + for (i = count - 1; i >= 0; --i) + crypto_unregister_rng(algs + i); +} +EXPORT_SYMBOL_GPL(crypto_unregister_rngs); + +static void __exit rng_exit(void) +{ + int err; + + err = crypto_del_default_rng(); + if (err) + pr_err("Failed delete default RNG: %d\n", err); +} + +module_exit(rng_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Random Number Generator"); -- cgit v1.3.1