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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Kernelspace interface to the pkey device driver
*
* Copyright IBM Corp. 2016, 2023
*
* Author: Harald Freudenberger <freude@de.ibm.com>
*
*/
#ifndef _KAPI_PKEY_H
#define _KAPI_PKEY_H
#include <linux/ioctl.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <uapi/asm/pkey.h>
/*
* In-kernel API: Transform an key blob (of any type) into a protected key.
* @param key pointer to a buffer containing the key blob
* @param keylen size of the key blob in bytes
* @param protkey pointer to buffer receiving the protected key
* @param xflags additional execution flags (see PKEY_XFLAG_* definitions below)
* As of now the only supported flags are PKEY_XFLAG_NOMEMALLOC
* and PKEY_XFLAG_NOCLEARKEY.
* @return 0 on success, negative errno value on failure
*/
int pkey_key2protkey(const u8 *key, u32 keylen,
u8 *protkey, u32 *protkeylen, u32 *protkeytype,
u32 xflags);
/*
* If this flag is given in the xflags parameter, the pkey implementation
* is not allowed to allocate memory but instead should fall back to use
* preallocated memory or simple fail with -ENOMEM.
* This flag is for protected key derive within a cipher or similar
* which must not allocate memory which would cause io operations - see
* also the CRYPTO_ALG_ALLOCATES_MEMORY flag in crypto.h.
*/
#define PKEY_XFLAG_NOMEMALLOC 0x0001
/*
* Do not accept a clear key token as source for a protected key.
*/
#define PKEY_XFLAG_NOCLEARKEY 0x0002
static inline int pkey_handle_expired(void)
{
/*
* Protected key expired due to relocation to another host. The long
* running re-wrap has no asynchronous completion notification, so
* polling is required. Trigger a re-schedule of this request by
* returning -ENOSPC ("hardware queue full") to the crypto engine.
* To avoid immediately re-invocation of this callback,
* tell the scheduler to voluntarily give up the CPU here.
*/
msleep(1);
pr_debug("rescheduling request\n");
return -ENOSPC;
}
#endif /* _KAPI_PKEY_H */
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