Merge tag 'asm-generic-mmu-context-5.11' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / drivers / xen / arm-device.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2015, Linaro Limited, Shannon Zhao
4  */
5
6 #include <linux/platform_device.h>
7 #include <linux/acpi.h>
8 #include <xen/xen.h>
9 #include <xen/page.h>
10 #include <xen/interface/memory.h>
11 #include <asm/xen/hypervisor.h>
12 #include <asm/xen/hypercall.h>
13
14 static int xen_unmap_device_mmio(const struct resource *resources,
15                                  unsigned int count)
16 {
17         unsigned int i, j, nr;
18         int rc = 0;
19         const struct resource *r;
20         struct xen_remove_from_physmap xrp;
21
22         for (i = 0; i < count; i++) {
23                 r = &resources[i];
24                 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
25                 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
26                         continue;
27
28                 for (j = 0; j < nr; j++) {
29                         xrp.domid = DOMID_SELF;
30                         xrp.gpfn = XEN_PFN_DOWN(r->start) + j;
31                         rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap,
32                                                   &xrp);
33                         if (rc)
34                                 return rc;
35                 }
36         }
37
38         return rc;
39 }
40
41 static int xen_map_device_mmio(const struct resource *resources,
42                                unsigned int count)
43 {
44         unsigned int i, j, nr;
45         int rc = 0;
46         const struct resource *r;
47         xen_pfn_t *gpfns;
48         xen_ulong_t *idxs;
49         int *errs;
50
51         for (i = 0; i < count; i++) {
52                 struct xen_add_to_physmap_range xatp = {
53                         .domid = DOMID_SELF,
54                         .space = XENMAPSPACE_dev_mmio
55                 };
56
57                 r = &resources[i];
58                 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
59                 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
60                         continue;
61
62                 gpfns = kcalloc(nr, sizeof(xen_pfn_t), GFP_KERNEL);
63                 idxs = kcalloc(nr, sizeof(xen_ulong_t), GFP_KERNEL);
64                 errs = kcalloc(nr, sizeof(int), GFP_KERNEL);
65                 if (!gpfns || !idxs || !errs) {
66                         kfree(gpfns);
67                         kfree(idxs);
68                         kfree(errs);
69                         rc = -ENOMEM;
70                         goto unmap;
71                 }
72
73                 for (j = 0; j < nr; j++) {
74                         /*
75                          * The regions are always mapped 1:1 to DOM0 and this is
76                          * fine because the memory map for DOM0 is the same as
77                          * the host (except for the RAM).
78                          */
79                         gpfns[j] = XEN_PFN_DOWN(r->start) + j;
80                         idxs[j] = XEN_PFN_DOWN(r->start) + j;
81                 }
82
83                 xatp.size = nr;
84
85                 set_xen_guest_handle(xatp.gpfns, gpfns);
86                 set_xen_guest_handle(xatp.idxs, idxs);
87                 set_xen_guest_handle(xatp.errs, errs);
88
89                 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
90                 kfree(gpfns);
91                 kfree(idxs);
92                 kfree(errs);
93                 if (rc)
94                         goto unmap;
95         }
96
97         return rc;
98
99 unmap:
100         xen_unmap_device_mmio(resources, i);
101         return rc;
102 }
103
104 static int xen_platform_notifier(struct notifier_block *nb,
105                                  unsigned long action, void *data)
106 {
107         struct platform_device *pdev = to_platform_device(data);
108         int r = 0;
109
110         if (pdev->num_resources == 0 || pdev->resource == NULL)
111                 return NOTIFY_OK;
112
113         switch (action) {
114         case BUS_NOTIFY_ADD_DEVICE:
115                 r = xen_map_device_mmio(pdev->resource, pdev->num_resources);
116                 break;
117         case BUS_NOTIFY_DEL_DEVICE:
118                 r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources);
119                 break;
120         default:
121                 return NOTIFY_DONE;
122         }
123         if (r)
124                 dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n",
125                         action == BUS_NOTIFY_ADD_DEVICE ? "map" :
126                         (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
127                         pdev->name);
128
129         return NOTIFY_OK;
130 }
131
132 static struct notifier_block platform_device_nb = {
133         .notifier_call = xen_platform_notifier,
134 };
135
136 static int __init register_xen_platform_notifier(void)
137 {
138         if (!xen_initial_domain() || acpi_disabled)
139                 return 0;
140
141         return bus_register_notifier(&platform_bus_type, &platform_device_nb);
142 }
143
144 arch_initcall(register_xen_platform_notifier);
145
146 #ifdef CONFIG_ARM_AMBA
147 #include <linux/amba/bus.h>
148
149 static int xen_amba_notifier(struct notifier_block *nb,
150                              unsigned long action, void *data)
151 {
152         struct amba_device *adev = to_amba_device(data);
153         int r = 0;
154
155         switch (action) {
156         case BUS_NOTIFY_ADD_DEVICE:
157                 r = xen_map_device_mmio(&adev->res, 1);
158                 break;
159         case BUS_NOTIFY_DEL_DEVICE:
160                 r = xen_unmap_device_mmio(&adev->res, 1);
161                 break;
162         default:
163                 return NOTIFY_DONE;
164         }
165         if (r)
166                 dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
167                         action == BUS_NOTIFY_ADD_DEVICE ? "map" :
168                         (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
169                         adev->dev.init_name);
170
171         return NOTIFY_OK;
172 }
173
174 static struct notifier_block amba_device_nb = {
175         .notifier_call = xen_amba_notifier,
176 };
177
178 static int __init register_xen_amba_notifier(void)
179 {
180         if (!xen_initial_domain() || acpi_disabled)
181                 return 0;
182
183         return bus_register_notifier(&amba_bustype, &amba_device_nb);
184 }
185
186 arch_initcall(register_xen_amba_notifier);
187 #endif