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1/*
2 * Copyright (c) 2015, Linaro Limited, Shannon Zhao
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include <linux/platform_device.h>
18#include <linux/acpi.h>
19#include <xen/xen.h>
20#include <xen/page.h>
21#include <xen/interface/memory.h>
22#include <asm/xen/hypervisor.h>
23#include <asm/xen/hypercall.h>
24
25static int xen_unmap_device_mmio(const struct resource *resources,
26 unsigned int count)
27{
28 unsigned int i, j, nr;
29 int rc = 0;
30 const struct resource *r;
31 struct xen_remove_from_physmap xrp;
32
33 for (i = 0; i < count; i++) {
34 r = &resources[i];
35 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
36 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
37 continue;
38
39 for (j = 0; j < nr; j++) {
40 xrp.domid = DOMID_SELF;
41 xrp.gpfn = XEN_PFN_DOWN(r->start) + j;
42 rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap,
43 &xrp);
44 if (rc)
45 return rc;
46 }
47 }
48
49 return rc;
50}
51
52static int xen_map_device_mmio(const struct resource *resources,
53 unsigned int count)
54{
55 unsigned int i, j, nr;
56 int rc = 0;
57 const struct resource *r;
58 xen_pfn_t *gpfns;
59 xen_ulong_t *idxs;
60 int *errs;
61
62 for (i = 0; i < count; i++) {
63 struct xen_add_to_physmap_range xatp = {
64 .domid = DOMID_SELF,
65 .space = XENMAPSPACE_dev_mmio
66 };
67
68 r = &resources[i];
69 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
70 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
71 continue;
72
73 gpfns = kcalloc(nr, sizeof(xen_pfn_t), GFP_KERNEL);
74 idxs = kcalloc(nr, sizeof(xen_ulong_t), GFP_KERNEL);
75 errs = kcalloc(nr, sizeof(int), GFP_KERNEL);
76 if (!gpfns || !idxs || !errs) {
77 kfree(gpfns);
78 kfree(idxs);
79 kfree(errs);
80 rc = -ENOMEM;
81 goto unmap;
82 }
83
84 for (j = 0; j < nr; j++) {
85 /*
86 * The regions are always mapped 1:1 to DOM0 and this is
87 * fine because the memory map for DOM0 is the same as
88 * the host (except for the RAM).
89 */
90 gpfns[j] = XEN_PFN_DOWN(r->start) + j;
91 idxs[j] = XEN_PFN_DOWN(r->start) + j;
92 }
93
94 xatp.size = nr;
95
96 set_xen_guest_handle(xatp.gpfns, gpfns);
97 set_xen_guest_handle(xatp.idxs, idxs);
98 set_xen_guest_handle(xatp.errs, errs);
99
100 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
101 kfree(gpfns);
102 kfree(idxs);
103 kfree(errs);
104 if (rc)
105 goto unmap;
106 }
107
108 return rc;
109
110unmap:
111 xen_unmap_device_mmio(resources, i);
112 return rc;
113}
114
115static int xen_platform_notifier(struct notifier_block *nb,
116 unsigned long action, void *data)
117{
118 struct platform_device *pdev = to_platform_device(data);
119 int r = 0;
120
121 if (pdev->num_resources == 0 || pdev->resource == NULL)
122 return NOTIFY_OK;
123
124 switch (action) {
125 case BUS_NOTIFY_ADD_DEVICE:
126 r = xen_map_device_mmio(pdev->resource, pdev->num_resources);
127 break;
128 case BUS_NOTIFY_DEL_DEVICE:
129 r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources);
130 break;
131 default:
132 return NOTIFY_DONE;
133 }
134 if (r)
135 dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n",
136 action == BUS_NOTIFY_ADD_DEVICE ? "map" :
137 (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
138 pdev->name);
139
140 return NOTIFY_OK;
141}
142
143static struct notifier_block platform_device_nb = {
144 .notifier_call = xen_platform_notifier,
145};
146
147static int __init register_xen_platform_notifier(void)
148{
149 if (!xen_initial_domain() || acpi_disabled)
150 return 0;
151
152 return bus_register_notifier(&platform_bus_type, &platform_device_nb);
153}
154
155arch_initcall(register_xen_platform_notifier);
156
157#ifdef CONFIG_ARM_AMBA
158#include <linux/amba/bus.h>
159
160static int xen_amba_notifier(struct notifier_block *nb,
161 unsigned long action, void *data)
162{
163 struct amba_device *adev = to_amba_device(data);
164 int r = 0;
165
166 switch (action) {
167 case BUS_NOTIFY_ADD_DEVICE:
168 r = xen_map_device_mmio(&adev->res, 1);
169 break;
170 case BUS_NOTIFY_DEL_DEVICE:
171 r = xen_unmap_device_mmio(&adev->res, 1);
172 break;
173 default:
174 return NOTIFY_DONE;
175 }
176 if (r)
177 dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
178 action == BUS_NOTIFY_ADD_DEVICE ? "map" :
179 (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
180 adev->dev.init_name);
181
182 return NOTIFY_OK;
183}
184
185static struct notifier_block amba_device_nb = {
186 .notifier_call = xen_amba_notifier,
187};
188
189static int __init register_xen_amba_notifier(void)
190{
191 if (!xen_initial_domain() || acpi_disabled)
192 return 0;
193
194 return bus_register_notifier(&amba_bustype, &amba_device_nb);
195}
196
197arch_initcall(register_xen_amba_notifier);
198#endif
199

Warning: That file was not part of the compilation database. It may have many parsing errors.