PCI: Add pci_irq_type() to query the allocated interrupt typegrafted

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 <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
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 <dakr@kernel.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/include/crypto/internal/sig.h b/include/crypto/internal/sig.h
new file mode 100644
index 000000000..b16648c1a
--- /dev/null
+++ b/include/crypto/internal/sig.h
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Public Key Signature Algorithm
+ *
+ * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+#ifndef _CRYPTO_INTERNAL_SIG_H
+#define _CRYPTO_INTERNAL_SIG_H
+
+#include <crypto/algapi.h>
+#include <crypto/sig.h>
+
+struct sig_instance {
+	void (*free)(struct sig_instance *inst);
+	union {
+		struct {
+			char head[offsetof(struct sig_alg, base)];
+			struct crypto_instance base;
+		};
+		struct sig_alg alg;
+	};
+};
+
+struct crypto_sig_spawn {
+	struct crypto_spawn base;
+};
+
+static inline void *crypto_sig_ctx(struct crypto_sig *tfm)
+{
+	return crypto_tfm_ctx(&tfm->base);
+}
+
+/**
+ * crypto_register_sig() -- Register public key signature algorithm
+ *
+ * Function registers an implementation of a public key signature algorithm
+ *
+ * @alg:	algorithm definition
+ *
+ * Return: zero on success; error code in case of error
+ */
+int crypto_register_sig(struct sig_alg *alg);
+
+/**
+ * crypto_unregister_sig() -- Unregister public key signature algorithm
+ *
+ * Function unregisters an implementation of a public key signature algorithm
+ *
+ * @alg:	algorithm definition
+ */
+void crypto_unregister_sig(struct sig_alg *alg);
+
+int sig_register_instance(struct crypto_template *tmpl,
+			  struct sig_instance *inst);
+
+static inline struct sig_instance *sig_instance(struct crypto_instance *inst)
+{
+	return container_of(&inst->alg, struct sig_instance, alg.base);
+}
+
+static inline struct sig_instance *sig_alg_instance(struct crypto_sig *tfm)
+{
+	return sig_instance(crypto_tfm_alg_instance(&tfm->base));
+}
+
+static inline struct crypto_instance *sig_crypto_instance(struct sig_instance
+									*inst)
+{
+	return container_of(&inst->alg.base, struct crypto_instance, alg);
+}
+
+static inline void *sig_instance_ctx(struct sig_instance *inst)
+{
+	return crypto_instance_ctx(sig_crypto_instance(inst));
+}
+
+int crypto_grab_sig(struct crypto_sig_spawn *spawn,
+		    struct crypto_instance *inst,
+		    const char *name, u32 type, u32 mask);
+
+static inline struct crypto_sig *crypto_spawn_sig(struct crypto_sig_spawn
+								   *spawn)
+{
+	return crypto_spawn_tfm2(&spawn->base);
+}
+
+static inline void crypto_drop_sig(struct crypto_sig_spawn *spawn)
+{
+	crypto_drop_spawn(&spawn->base);
+}
+
+static inline struct sig_alg *crypto_spawn_sig_alg(struct crypto_sig_spawn
+								    *spawn)
+{
+	return container_of(spawn->base.alg, struct sig_alg, base);
+}
+#endif