Merge branch 'arm-privcmd-for-3.8' of git://xenbits.xen.org/people/ianc/linux into...
[~shefty/rdma-dev.git] / arch / arm / xen / enlighten.c
1 #include <xen/xen.h>
2 #include <xen/events.h>
3 #include <xen/grant_table.h>
4 #include <xen/hvm.h>
5 #include <xen/interface/xen.h>
6 #include <xen/interface/memory.h>
7 #include <xen/interface/hvm/params.h>
8 #include <xen/features.h>
9 #include <xen/platform_pci.h>
10 #include <xen/xenbus.h>
11 #include <xen/page.h>
12 #include <xen/xen-ops.h>
13 #include <asm/xen/hypervisor.h>
14 #include <asm/xen/hypercall.h>
15 #include <linux/interrupt.h>
16 #include <linux/irqreturn.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/of_irq.h>
20 #include <linux/of_address.h>
21
22 #include <linux/mm.h>
23
24 struct start_info _xen_start_info;
25 struct start_info *xen_start_info = &_xen_start_info;
26 EXPORT_SYMBOL_GPL(xen_start_info);
27
28 enum xen_domain_type xen_domain_type = XEN_NATIVE;
29 EXPORT_SYMBOL_GPL(xen_domain_type);
30
31 struct shared_info xen_dummy_shared_info;
32 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
33
34 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
35
36 /* These are unused until we support booting "pre-ballooned" */
37 unsigned long xen_released_pages;
38 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
39
40 /* TODO: to be removed */
41 __read_mostly int xen_have_vector_callback;
42 EXPORT_SYMBOL_GPL(xen_have_vector_callback);
43
44 int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
45 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
46
47 static __read_mostly int xen_events_irq = -1;
48
49 /* map fgmfn of domid to lpfn in the current domain */
50 static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
51                             unsigned int domid)
52 {
53         int rc;
54         struct xen_add_to_physmap_range xatp = {
55                 .domid = DOMID_SELF,
56                 .foreign_domid = domid,
57                 .size = 1,
58                 .space = XENMAPSPACE_gmfn_foreign,
59         };
60         xen_ulong_t idx = fgmfn;
61         xen_pfn_t gpfn = lpfn;
62
63         set_xen_guest_handle(xatp.idxs, &idx);
64         set_xen_guest_handle(xatp.gpfns, &gpfn);
65
66         rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
67         if (rc) {
68                 pr_warn("Failed to map pfn to mfn rc:%d pfn:%lx mfn:%lx\n",
69                         rc, lpfn, fgmfn);
70                 return 1;
71         }
72         return 0;
73 }
74
75 struct remap_data {
76         xen_pfn_t fgmfn; /* foreign domain's gmfn */
77         pgprot_t prot;
78         domid_t  domid;
79         struct vm_area_struct *vma;
80         int index;
81         struct page **pages;
82         struct xen_remap_mfn_info *info;
83 };
84
85 static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
86                         void *data)
87 {
88         struct remap_data *info = data;
89         struct page *page = info->pages[info->index++];
90         unsigned long pfn = page_to_pfn(page);
91         pte_t pte = pfn_pte(pfn, info->prot);
92
93         if (map_foreign_page(pfn, info->fgmfn, info->domid))
94                 return -EFAULT;
95         set_pte_at(info->vma->vm_mm, addr, ptep, pte);
96
97         return 0;
98 }
99
100 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
101                                unsigned long addr,
102                                xen_pfn_t mfn, int nr,
103                                pgprot_t prot, unsigned domid,
104                                struct page **pages)
105 {
106         int err;
107         struct remap_data data;
108
109         /* TBD: Batching, current sole caller only does page at a time */
110         if (nr > 1)
111                 return -EINVAL;
112
113         data.fgmfn = mfn;
114         data.prot = prot;
115         data.domid = domid;
116         data.vma = vma;
117         data.index = 0;
118         data.pages = pages;
119         err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
120                                   remap_pte_fn, &data);
121         return err;
122 }
123 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
124
125 int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
126                                int nr, struct page **pages)
127 {
128         int i;
129
130         for (i = 0; i < nr; i++) {
131                 struct xen_remove_from_physmap xrp;
132                 unsigned long rc, pfn;
133
134                 pfn = page_to_pfn(pages[i]);
135
136                 xrp.domid = DOMID_SELF;
137                 xrp.gpfn = pfn;
138                 rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
139                 if (rc) {
140                         pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
141                                 pfn, rc);
142                         return rc;
143                 }
144         }
145         return 0;
146 }
147 EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
148
149 /*
150  * see Documentation/devicetree/bindings/arm/xen.txt for the
151  * documentation of the Xen Device Tree format.
152  */
153 #define GRANT_TABLE_PHYSADDR 0
154 static int __init xen_guest_init(void)
155 {
156         struct xen_add_to_physmap xatp;
157         static struct shared_info *shared_info_page = 0;
158         struct device_node *node;
159         int len;
160         const char *s = NULL;
161         const char *version = NULL;
162         const char *xen_prefix = "xen,xen-";
163         struct resource res;
164
165         node = of_find_compatible_node(NULL, NULL, "xen,xen");
166         if (!node) {
167                 pr_debug("No Xen support\n");
168                 return 0;
169         }
170         s = of_get_property(node, "compatible", &len);
171         if (strlen(xen_prefix) + 3  < len &&
172                         !strncmp(xen_prefix, s, strlen(xen_prefix)))
173                 version = s + strlen(xen_prefix);
174         if (version == NULL) {
175                 pr_debug("Xen version not found\n");
176                 return 0;
177         }
178         if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
179                 return 0;
180         xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
181         xen_events_irq = irq_of_parse_and_map(node, 0);
182         pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
183                         version, xen_events_irq, xen_hvm_resume_frames);
184         xen_domain_type = XEN_HVM_DOMAIN;
185
186         xen_setup_features();
187         if (xen_feature(XENFEAT_dom0))
188                 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
189         else
190                 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
191
192         if (!shared_info_page)
193                 shared_info_page = (struct shared_info *)
194                         get_zeroed_page(GFP_KERNEL);
195         if (!shared_info_page) {
196                 pr_err("not enough memory\n");
197                 return -ENOMEM;
198         }
199         xatp.domid = DOMID_SELF;
200         xatp.idx = 0;
201         xatp.space = XENMAPSPACE_shared_info;
202         xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
203         if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
204                 BUG();
205
206         HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
207
208         /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
209          * page, we use it in the event channel upcall and in some pvclock
210          * related functions. We don't need the vcpu_info placement
211          * optimizations because we don't use any pv_mmu or pv_irq op on
212          * HVM.
213          * The shared info contains exactly 1 CPU (the boot CPU). The guest
214          * is required to use VCPUOP_register_vcpu_info to place vcpu info
215          * for secondary CPUs as they are brought up. */
216         per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
217
218         gnttab_init();
219         if (!xen_initial_domain())
220                 xenbus_probe(NULL);
221
222         return 0;
223 }
224 core_initcall(xen_guest_init);
225
226 static irqreturn_t xen_arm_callback(int irq, void *arg)
227 {
228         xen_hvm_evtchn_do_upcall();
229         return IRQ_HANDLED;
230 }
231
232 static int __init xen_init_events(void)
233 {
234         if (!xen_domain() || xen_events_irq < 0)
235                 return -ENODEV;
236
237         xen_init_IRQ();
238
239         if (request_percpu_irq(xen_events_irq, xen_arm_callback,
240                         "events", xen_vcpu)) {
241                 pr_err("Error requesting IRQ %d\n", xen_events_irq);
242                 return -EINVAL;
243         }
244
245         enable_percpu_irq(xen_events_irq, 0);
246
247         return 0;
248 }
249 postcore_initcall(xen_init_events);