osfmk/tests/pmap_tests.c

   1 /*
   2  * Copyright (c) 2016 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <vm/vm_page.h>
  30 #include <vm/pmap.h>
  31 #include <kern/ledger.h>
  32 #include <kern/thread.h>
  33
  34
  35 extern ledger_template_t task_ledger_template;
  36
  37 kern_return_t test_pmap_enter_disconnect(unsigned int num_loops);
  38 kern_return_t test_pmap_iommu_disconnect(void);
  39
  40 #define PMAP_TEST_VA (0xDEAD << PAGE_SHIFT)
  41
  42 typedef struct {
  43         pmap_t pmap;
  44         volatile boolean_t stop;
  45         ppnum_t pn;
  46 } pmap_test_thread_args;
  47
  48 static pmap_t
  49 pmap_create_wrapper()
  50 {
  51         pmap_t new_pmap = NULL;
  52         ledger_t ledger;
  53         assert(task_ledger_template != NULL);
  54         if ((ledger = ledger_instantiate(task_ledger_template, LEDGER_CREATE_ACTIVE_ENTRIES)) == NULL) {
  55                 return NULL;
  56         }
  57         new_pmap = pmap_create(ledger, 0, FALSE);
  58         ledger_dereference(ledger);
  59         return new_pmap;
  60 }
  61
  62 static void
  63 pmap_disconnect_thread(void *arg, wait_result_t __unused wres)
  64 {
  65         pmap_test_thread_args *args = arg;
  66         do {
  67                 pmap_disconnect(args->pn);
  68         } while (!args->stop);
  69         thread_wakeup((event_t)args);
  70 }
  71
  72 kern_return_t
  73 test_pmap_enter_disconnect(unsigned int num_loops)
  74 {
  75         kern_return_t kr = KERN_SUCCESS;
  76         thread_t disconnect_thread;
  77         pmap_t new_pmap = pmap_create_wrapper();
  78         if (new_pmap == NULL) {
  79                 return KERN_FAILURE;
  80         }
  81         vm_page_t m = vm_page_grab();
  82         if (m == VM_PAGE_NULL) {
  83                 pmap_destroy(new_pmap);
  84                 return KERN_FAILURE;
  85         }
  86         ppnum_t phys_page = VM_PAGE_GET_PHYS_PAGE(m);
  87         pmap_test_thread_args args = {new_pmap, FALSE, phys_page};
  88         kern_return_t res = kernel_thread_start(pmap_disconnect_thread, &args, &disconnect_thread);
  89         if (res) {
  90                 pmap_destroy(new_pmap);
  91                 vm_page_lock_queues();
  92                 vm_page_free(m);
  93                 vm_page_unlock_queues();
  94                 return res;
  95         }
  96         thread_deallocate(disconnect_thread);
  97
  98         while (num_loops-- != 0) {
  99                 kr = pmap_enter(new_pmap, PMAP_TEST_VA, phys_page,
 100                     VM_PROT_READ | VM_PROT_WRITE, VM_PROT_NONE, VM_WIMG_USE_DEFAULT, FALSE);
 101                 assert(kr == KERN_SUCCESS);
 102         }
 103
 104         assert_wait((event_t)&args, THREAD_UNINT);
 105         args.stop = TRUE;
 106         thread_block(THREAD_CONTINUE_NULL);
 107
 108         pmap_remove(new_pmap, PMAP_TEST_VA, PMAP_TEST_VA + PAGE_SIZE);
 109         vm_page_lock_queues();
 110         vm_page_free(m);
 111         vm_page_unlock_queues();
 112         pmap_destroy(new_pmap);
 113         return KERN_SUCCESS;
 114 }
 115
 116 kern_return_t
 117 test_pmap_iommu_disconnect(void)
 118 {
 119         return KERN_SUCCESS;
 120 }