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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/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 | |
34 | struct 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 | |
61 | err1: |
62 | free_pages(virt, order); |
63 | err0: |
64 | return NULL; |
65 | } |
66 | EXPORT_SYMBOL_GPL(xen_alloc_vm_area); |
67 | |
68 | void 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 | } |
93 | EXPORT_SYMBOL_GPL(xen_free_vm_area); |
94 | |
95 | |
96 | /**************************************************************************** |
97 | * grant table hack |
98 | * cmd: GNTTABOP_xxx |
99 | */ |
100 | |
101 | int 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 | |
109 | void arch_gnttab_unmap_shared(struct grant_entry *shared, |
110 | unsigned long nr_gframes) |
111 | { |
112 | /* nothing */ |
113 | } |
114 | |
115 | static void |
116 | gnttab_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 | |
143 | int |
144 | HYPERVISOR_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 | |
156 | EXPORT_SYMBOL(HYPERVISOR_grant_table_op); |
157 |
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