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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 struct xen_add_to_physmap_range xatp;
62
63 for (i = 0; i < count; i++) {
64 r = &resources[i];
65 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
66 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
67 continue;
68
69 gpfns = kzalloc(sizeof(xen_pfn_t) * nr, GFP_KERNEL);
70 idxs = kzalloc(sizeof(xen_ulong_t) * nr, GFP_KERNEL);
71 errs = kzalloc(sizeof(int) * nr, GFP_KERNEL);
72 if (!gpfns || !idxs || !errs) {
73 kfree(gpfns);
74 kfree(idxs);
75 kfree(errs);
76 rc = -ENOMEM;
77 goto unmap;
78 }
79
80 for (j = 0; j < nr; j++) {
81
82
83
84
85
86 gpfns[j] = XEN_PFN_DOWN(r->start) + j;
87 idxs[j] = XEN_PFN_DOWN(r->start) + j;
88 }
89
90 xatp.domid = DOMID_SELF;
91 xatp.size = nr;
92 xatp.space = XENMAPSPACE_dev_mmio;
93
94 set_xen_guest_handle(xatp.gpfns, gpfns);
95 set_xen_guest_handle(xatp.idxs, idxs);
96 set_xen_guest_handle(xatp.errs, errs);
97
98 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
99 kfree(gpfns);
100 kfree(idxs);
101 kfree(errs);
102 if (rc)
103 goto unmap;
104 }
105
106 return rc;
107
108unmap:
109 xen_unmap_device_mmio(resources, i);
110 return rc;
111}
112
113static int xen_platform_notifier(struct notifier_block *nb,
114 unsigned long action, void *data)
115{
116 struct platform_device *pdev = to_platform_device(data);
117 int r = 0;
118
119 if (pdev->num_resources == 0 || pdev->resource == NULL)
120 return NOTIFY_OK;
121
122 switch (action) {
123 case BUS_NOTIFY_ADD_DEVICE:
124 r = xen_map_device_mmio(pdev->resource, pdev->num_resources);
125 break;
126 case BUS_NOTIFY_DEL_DEVICE:
127 r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources);
128 break;
129 default:
130 return NOTIFY_DONE;
131 }
132 if (r)
133 dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n",
134 action == BUS_NOTIFY_ADD_DEVICE ? "map" :
135 (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
136 pdev->name);
137
138 return NOTIFY_OK;
139}
140
141static struct notifier_block platform_device_nb = {
142 .notifier_call = xen_platform_notifier,
143};
144
145static int __init register_xen_platform_notifier(void)
146{
147 if (!xen_initial_domain() || acpi_disabled)
148 return 0;
149
150 return bus_register_notifier(&platform_bus_type, &platform_device_nb);
151}
152
153arch_initcall(register_xen_platform_notifier);
154
155#ifdef CONFIG_ARM_AMBA
156#include <linux/amba/bus.h>
157
158static int xen_amba_notifier(struct notifier_block *nb,
159 unsigned long action, void *data)
160{
161 struct amba_device *adev = to_amba_device(data);
162 int r = 0;
163
164 switch (action) {
165 case BUS_NOTIFY_ADD_DEVICE:
166 r = xen_map_device_mmio(&adev->res, 1);
167 break;
168 case BUS_NOTIFY_DEL_DEVICE:
169 r = xen_unmap_device_mmio(&adev->res, 1);
170 break;
171 default:
172 return NOTIFY_DONE;
173 }
174 if (r)
175 dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
176 action == BUS_NOTIFY_ADD_DEVICE ? "map" :
177 (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
178 adev->dev.init_name);
179
180 return NOTIFY_OK;
181}
182
183static struct notifier_block amba_device_nb = {
184 .notifier_call = xen_amba_notifier,
185};
186
187static int __init register_xen_amba_notifier(void)
188{
189 if (!xen_initial_domain() || acpi_disabled)
190 return 0;
191
192 return bus_register_notifier(&amba_bustype, &amba_device_nb);
193}
194
195arch_initcall(register_xen_amba_notifier);
196#endif
197
