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127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/*-
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* Copyright (C) 2019 Justin Hibbits
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/eventhandler.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/vmem.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include "opal.h"
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#include <machine/cpufunc.h>
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/*
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* Manage asynchronous tokens for the OPAL abstraction layer.
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*
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* Only a finite number of in-flight tokens are supported by OPAL, so we must be
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* careful managing this. The basic design uses the vmem subsystem as a general
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* purpose allocator, with wrappers to manage expected behaviors and
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* requirements.
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*/
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static vmem_t *async_token_pool;
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static void opal_handle_async_completion(void *, struct opal_msg *);
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struct async_completion {
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volatile uint64_t completed;
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struct opal_msg msg;
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};
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struct async_completion *completions;
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/* Setup the token pool. */
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int
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opal_init_async_tokens(int count)
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{
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/* Only allow one initialization */
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if (async_token_pool != NULL)
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return (EINVAL);
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async_token_pool = vmem_create("OPAL Async", 0, count, 1, 1,
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M_WAITOK | M_FIRSTFIT);
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completions = malloc(count * sizeof(struct async_completion),
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M_DEVBUF, M_WAITOK | M_ZERO);
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EVENTHANDLER_REGISTER(OPAL_ASYNC_COMP, opal_handle_async_completion,
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NULL, EVENTHANDLER_PRI_ANY);
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return (0);
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}
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int
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opal_alloc_async_token(void)
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{
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vmem_addr_t token;
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vmem_alloc(async_token_pool, 1, M_FIRSTFIT | M_WAITOK, &token);
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completions[token].completed = false;
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return (token);
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}
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void
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opal_free_async_token(int token)
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{
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vmem_free(async_token_pool, token, 1);
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}
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/*
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* Wait for the operation watched by the token to complete. Return the result
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* of the operation, error if it returns early.
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*/
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int
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opal_wait_completion(void *buf, uint64_t size, int token)
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{
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int err;
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do {
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err = opal_call(OPAL_CHECK_ASYNC_COMPLETION,
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vtophys(buf), size, token);
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if (err == OPAL_BUSY) {
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if (completions[token].completed) {
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atomic_thread_fence_acq();
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memcpy(buf, &completions[token].msg, size);
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return (OPAL_SUCCESS);
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}
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}
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DELAY(100);
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} while (err == OPAL_BUSY);
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return (err);
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}
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static void opal_handle_async_completion(void *arg, struct opal_msg *msg)
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{
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int token;
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token = msg->params[0];
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memcpy(&completions[token].msg, msg, sizeof(*msg));
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atomic_thread_fence_rel();
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completions[token].completed = true;
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}
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