1 /*- 2 * Copyright (C) 2019 Justin Hibbits 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 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; 19 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 20 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 21 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 22 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 * 24 * $FreeBSD$ 25 */ 26 27 #include <sys/cdefs.h> 28 #include <sys/param.h> 29 #include <sys/types.h> 30 #include <sys/malloc.h> 31 #include <sys/proc.h> 32 #include <sys/vmem.h> 33 34 #include <vm/vm.h> 35 #include <vm/pmap.h> 36 #include "opal.h" 37 38 /* 39 * Manage asynchronous tokens for the OPAL abstraction layer. 40 * 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 44 * requirements. 45 */ 46 static vmem_t *async_token_pool; 47 48 /* Setup the token pool. */ 49 int 50 opal_init_async_tokens(int count) 51 { 52 /* Only allow one initialization */ 53 if (async_token_pool != NULL) 54 return (EINVAL); 55 56 async_token_pool = vmem_create("OPAL Async", 0, count, 1, 1, 57 M_WAITOK | M_FIRSTFIT); 58 59 return (0); 60 } 61 62 int 63 opal_alloc_async_token(void) 64 { 65 vmem_addr_t token; 66 67 vmem_alloc(async_token_pool, 1, M_FIRSTFIT | M_WAITOK, &token); 68 69 return (token); 70 } 71 72 void 73 opal_free_async_token(int token) 74 { 75 76 vmem_free(async_token_pool, token, 1); 77 } 78 79 /* 80 * Wait for the operation watched by the token to complete. Return the result 81 * of the operation, error if it returns early. 82 */ 83 int 84 opal_wait_completion(void *buf, uint64_t size, uint64_t token) 85 { 86 int err; 87 88 do { 89 err = opal_call(OPAL_CHECK_ASYNC_COMPLETION, 90 vtophys(buf), size, token); 91 } while (err == OPAL_BUSY); 92 93 return (err); 94 } 95