vmm_mem.c

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    1 /*-
    2  * Copyright (c) 2011 NetApp, Inc.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/11.0/sys/amd64/vmm/vmm_mem.c 284539 2015-06-18 06:00:17Z neel $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/11.0/sys/amd64/vmm/vmm_mem.c 284539 2015-06-18 06:00:17Z neel $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/malloc.h>
   35 #include <sys/sglist.h>
   36 #include <sys/lock.h>
   37 #include <sys/rwlock.h>
   38 
   39 #include <vm/vm.h>
   40 #include <vm/vm_param.h>
   41 #include <vm/pmap.h>
   42 #include <vm/vm_map.h>
   43 #include <vm/vm_object.h>
   44 #include <vm/vm_page.h>
   45 #include <vm/vm_pager.h>
   46 
   47 #include <machine/md_var.h>
   48 
   49 #include "vmm_mem.h"
   50 
   51 int
   52 vmm_mem_init(void)
   53 {
   54 
   55         return (0);
   56 }
   57 
   58 vm_object_t
   59 vmm_mmio_alloc(struct vmspace *vmspace, vm_paddr_t gpa, size_t len,
   60                vm_paddr_t hpa)
   61 {
   62         int error;
   63         vm_object_t obj;
   64         struct sglist *sg;
   65 
   66         sg = sglist_alloc(1, M_WAITOK);
   67         error = sglist_append_phys(sg, hpa, len);
   68         KASSERT(error == 0, ("error %d appending physaddr to sglist", error));
   69 
   70         obj = vm_pager_allocate(OBJT_SG, sg, len, VM_PROT_RW, 0, NULL);
   71         if (obj != NULL) {
   72                 /*
   73                  * VT-x ignores the MTRR settings when figuring out the
   74                  * memory type for translations obtained through EPT.
   75                  *
   76                  * Therefore we explicitly force the pages provided by
   77                  * this object to be mapped as uncacheable.
   78                  */
   79                 VM_OBJECT_WLOCK(obj);
   80                 error = vm_object_set_memattr(obj, VM_MEMATTR_UNCACHEABLE);
   81                 VM_OBJECT_WUNLOCK(obj);
   82                 if (error != KERN_SUCCESS) {
   83                         panic("vmm_mmio_alloc: vm_object_set_memattr error %d",
   84                                 error);
   85                 }
   86                 error = vm_map_find(&vmspace->vm_map, obj, 0, &gpa, len, 0,
   87                                     VMFS_NO_SPACE, VM_PROT_RW, VM_PROT_RW, 0);
   88                 if (error != KERN_SUCCESS) {
   89                         vm_object_deallocate(obj);
   90                         obj = NULL;
   91                 }
   92         }
   93 
   94         /*
   95          * Drop the reference on the sglist.
   96          *
   97          * If the scatter/gather object was successfully allocated then it
   98          * has incremented the reference count on the sglist. Dropping the
   99          * initial reference count ensures that the sglist will be freed
  100          * when the object is deallocated.
  101          * 
  102          * If the object could not be allocated then we end up freeing the
  103          * sglist.
  104          */
  105         sglist_free(sg);
  106 
  107         return (obj);
  108 }
  109 
  110 void
  111 vmm_mmio_free(struct vmspace *vmspace, vm_paddr_t gpa, size_t len)
  112 {
  113 
  114         vm_map_remove(&vmspace->vm_map, gpa, gpa + len);
  115 }
  116 
  117 vm_paddr_t
  118 vmm_mem_maxaddr(void)
  119 {
  120 
  121         return (ptoa(Maxmem));
  122 }

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FreeBSD/Linux Kernel Cross Reference sys/amd64/vmm/vmm_mem.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/vmm_mem.c