2 * Copyright (C) 2019 Justin Hibbits
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
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11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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16 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
18 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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27 #include <sys/cdefs.h>
28 #include <sys/param.h>
29 #include <sys/types.h>
30 #include <sys/malloc.h>
39 * Manage asynchronous tokens for the OPAL abstraction layer.
41 * Only a finite number of in-flight tokens are supported by OPAL, so we must be
42 * careful managing this. The basic design uses the vmem subsystem as a general
43 * purpose allocator, with wrappers to manage expected behaviors and
46 static vmem_t *async_token_pool;
48 /* Setup the token pool. */
50 opal_init_async_tokens(int count)
52 /* Only allow one initialization */
53 if (async_token_pool != NULL)
56 async_token_pool = vmem_create("OPAL Async", 0, count, 1, 1,
57 M_WAITOK | M_FIRSTFIT);
63 opal_alloc_async_token(void)
67 vmem_alloc(async_token_pool, 1, M_FIRSTFIT | M_WAITOK, &token);
73 opal_free_async_token(int token)
76 vmem_free(async_token_pool, token, 1);
80 * Wait for the operation watched by the token to complete. Return the result
81 * of the operation, error if it returns early.
84 opal_wait_completion(void *buf, uint64_t size, uint64_t token)
89 err = opal_call(OPAL_CHECK_ASYNC_COMPLETION,
90 vtophys(buf), size, token);
91 } while (err == OPAL_BUSY);