blob: 48cca37625ebdd04d08136037eeca93d92b71b73 [file] [log] [blame]
Isaku Yamahata7ad86312008-10-17 11:17:55 +09001/******************************************************************************
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Isaku Yamahata7ad86312008-10-17 11:17:55 +090026#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);