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-rw-r--r--arch/ia64/xen/grant-table.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/ia64/xen/grant-table.c b/arch/ia64/xen/grant-table.c
new file mode 100644
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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/mm.h>
26
27#include <xen/interface/xen.h>
28#include <xen/interface/memory.h>
29#include <xen/grant_table.h>
30
31#include <asm/xen/hypervisor.h>
32
33struct vm_struct *xen_alloc_vm_area(unsigned long size)
34{
35 int order;
36 unsigned long virt;
37 unsigned long nr_pages;
38 struct vm_struct *area;
39
40 order = get_order(size);
41 virt = __get_free_pages(GFP_KERNEL, order);
42 if (virt == 0)
43 goto err0;
44 nr_pages = 1 << order;
45 scrub_pages(virt, nr_pages);
46
47 area = kmalloc(sizeof(*area), GFP_KERNEL);
48 if (area == NULL)
49 goto err1;
50
51 area->flags = VM_IOREMAP;
52 area->addr = (void *)virt;
53 area->size = size;
54 area->pages = NULL;
55 area->nr_pages = nr_pages;
56 area->phys_addr = 0; /* xenbus_map_ring_valloc uses this field! */
57
58 return area;
59
60err1:
61 free_pages(virt, order);
62err0:
63 return NULL;
64}
65EXPORT_SYMBOL_GPL(xen_alloc_vm_area);
66
67void xen_free_vm_area(struct vm_struct *area)
68{
69 unsigned int order = get_order(area->size);
70 unsigned long i;
71 unsigned long phys_addr = __pa(area->addr);
72
73 /* This area is used for foreign page mappping.
74 * So underlying machine page may not be assigned. */
75 for (i = 0; i < (1 << order); i++) {
76 unsigned long ret;
77 unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i;
78 struct xen_memory_reservation reservation = {
79 .nr_extents = 1,
80 .address_bits = 0,
81 .extent_order = 0,
82 .domid = DOMID_SELF
83 };
84 set_xen_guest_handle(reservation.extent_start, &gpfn);
85 ret = HYPERVISOR_memory_op(XENMEM_populate_physmap,
86 &reservation);
87 BUG_ON(ret != 1);
88 }
89 free_pages((unsigned long)area->addr, order);
90 kfree(area);
91}
92EXPORT_SYMBOL_GPL(xen_free_vm_area);
93
94
95/****************************************************************************
96 * grant table hack
97 * cmd: GNTTABOP_xxx
98 */
99
100int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
101 unsigned long max_nr_gframes,
102 struct grant_entry **__shared)
103{
104 *__shared = __va(frames[0] << PAGE_SHIFT);
105 return 0;
106}
107
108void arch_gnttab_unmap_shared(struct grant_entry *shared,
109 unsigned long nr_gframes)
110{
111 /* nothing */
112}
113
114static void
115gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop)
116{
117 uint32_t flags;
118
119 flags = uop->flags;
120
121 if (flags & GNTMAP_host_map) {
122 if (flags & GNTMAP_application_map) {
123 printk(KERN_DEBUG
124 "GNTMAP_application_map is not supported yet: "
125 "flags 0x%x\n", flags);
126 BUG();
127 }
128 if (flags & GNTMAP_contains_pte) {
129 printk(KERN_DEBUG
130 "GNTMAP_contains_pte is not supported yet: "
131 "flags 0x%x\n", flags);
132 BUG();
133 }
134 } else if (flags & GNTMAP_device_map) {
135 printk("GNTMAP_device_map is not supported yet 0x%x\n", flags);
136 BUG(); /* not yet. actually this flag is not used. */
137 } else {
138 BUG();
139 }
140}
141
142int
143HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
144{
145 if (cmd == GNTTABOP_map_grant_ref) {
146 unsigned int i;
147 for (i = 0; i < count; i++) {
148 gnttab_map_grant_ref_pre(
149 (struct gnttab_map_grant_ref *)uop + i);
150 }
151 }
152 return xencomm_hypercall_grant_table_op(cmd, uop, count);
153}
154
155EXPORT_SYMBOL(HYPERVISOR_grant_table_op);