1/****************************************************************************** 2 * arch/ia64/xen/grant-table.c 3 * 4 * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp> 5 * VA Linux Systems Japan K.K. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23#include <linux/module.h> 24#include <linux/vmalloc.h> 25#include <linux/slab.h> 26#include <linux/mm.h> 27 28#include <xen/interface/xen.h> 29#include <xen/interface/memory.h> 30#include <xen/grant_table.h> 31 32#include <asm/xen/hypervisor.h> 33 34struct vm_struct *xen_alloc_vm_area(unsigned long size) 35{ 36 int order; 37 unsigned long virt; 38 unsigned long nr_pages; 39 struct vm_struct *area; 40 41 order = get_order(size); 42 virt = __get_free_pages(GFP_KERNEL, order); 43 if (virt == 0) 44 goto err0; 45 nr_pages = 1 << order; 46 scrub_pages(virt, nr_pages); 47 48 area = kmalloc(sizeof(*area), GFP_KERNEL); 49 if (area == NULL) 50 goto err1; 51 52 area->flags = VM_IOREMAP; 53 area->addr = (void *)virt; 54 area->size = size; 55 area->pages = NULL; 56 area->nr_pages = nr_pages; 57 area->phys_addr = 0; /* xenbus_map_ring_valloc uses this field! */ 58 59 return area; 60 61err1: 62 free_pages(virt, order); 63err0: 64 return NULL; 65} 66EXPORT_SYMBOL_GPL(xen_alloc_vm_area); 67 68void xen_free_vm_area(struct vm_struct *area) 69{ 70 unsigned int order = get_order(area->size); 71 unsigned long i; 72 unsigned long phys_addr = __pa(area->addr); 73 74 /* This area is used for foreign page mappping. 75 * So underlying machine page may not be assigned. */ 76 for (i = 0; i < (1 << order); i++) { 77 unsigned long ret; 78 unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i; 79 struct xen_memory_reservation reservation = { 80 .nr_extents = 1, 81 .address_bits = 0, 82 .extent_order = 0, 83 .domid = DOMID_SELF 84 }; 85 set_xen_guest_handle(reservation.extent_start, &gpfn); 86 ret = HYPERVISOR_memory_op(XENMEM_populate_physmap, 87 &reservation); 88 BUG_ON(ret != 1); 89 } 90 free_pages((unsigned long)area->addr, order); 91 kfree(area); 92} 93EXPORT_SYMBOL_GPL(xen_free_vm_area); 94 95 96/**************************************************************************** 97 * grant table hack 98 * cmd: GNTTABOP_xxx 99 */ 100 101int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes, 102 unsigned long max_nr_gframes, 103 struct grant_entry **__shared) 104{ 105 *__shared = __va(frames[0] << PAGE_SHIFT); 106 return 0; 107} 108 109void arch_gnttab_unmap_shared(struct grant_entry *shared, 110 unsigned long nr_gframes) 111{ 112 /* nothing */ 113} 114 115static void 116gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop) 117{ 118 uint32_t flags; 119 120 flags = uop->flags; 121 122 if (flags & GNTMAP_host_map) { 123 if (flags & GNTMAP_application_map) { 124 printk(KERN_DEBUG 125 "GNTMAP_application_map is not supported yet: " 126 "flags 0x%x\n", flags); 127 BUG(); 128 } 129 if (flags & GNTMAP_contains_pte) { 130 printk(KERN_DEBUG 131 "GNTMAP_contains_pte is not supported yet: " 132 "flags 0x%x\n", flags); 133 BUG(); 134 } 135 } else if (flags & GNTMAP_device_map) { 136 printk("GNTMAP_device_map is not supported yet 0x%x\n", flags); 137 BUG(); /* not yet. actually this flag is not used. */ 138 } else { 139 BUG(); 140 } 141} 142 143int 144HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count) 145{ 146 if (cmd == GNTTABOP_map_grant_ref) { 147 unsigned int i; 148 for (i = 0; i < count; i++) { 149 gnttab_map_grant_ref_pre( 150 (struct gnttab_map_grant_ref *)uop + i); 151 } 152 } 153 return xencomm_hypercall_grant_table_op(cmd, uop, count); 154} 155 156EXPORT_SYMBOL(HYPERVISOR_grant_table_op); 157