Drivers: hv: kvp: Support the new IP injection messages
[linux-3.10.git] / drivers / hv / hv.c
1 /*
2  * Copyright (c) 2009, Microsoft Corporation.
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 along with
14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15  * Place - Suite 330, Boston, MA 02111-1307 USA.
16  *
17  * Authors:
18  *   Haiyang Zhang <haiyangz@microsoft.com>
19  *   Hank Janssen  <hjanssen@microsoft.com>
20  *
21  */
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24 #include <linux/kernel.h>
25 #include <linux/mm.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/hyperv.h>
29 #include <linux/version.h>
30 #include <asm/hyperv.h>
31 #include "hyperv_vmbus.h"
32
33 /* The one and only */
34 struct hv_context hv_context = {
35         .synic_initialized      = false,
36         .hypercall_page         = NULL,
37         .signal_event_param     = NULL,
38         .signal_event_buffer    = NULL,
39 };
40
41 /*
42  * query_hypervisor_presence
43  * - Query the cpuid for presence of windows hypervisor
44  */
45 static int query_hypervisor_presence(void)
46 {
47         unsigned int eax;
48         unsigned int ebx;
49         unsigned int ecx;
50         unsigned int edx;
51         unsigned int op;
52
53         eax = 0;
54         ebx = 0;
55         ecx = 0;
56         edx = 0;
57         op = HVCPUID_VERSION_FEATURES;
58         cpuid(op, &eax, &ebx, &ecx, &edx);
59
60         return ecx & HV_PRESENT_BIT;
61 }
62
63 /*
64  * query_hypervisor_info - Get version info of the windows hypervisor
65  */
66 static int query_hypervisor_info(void)
67 {
68         unsigned int eax;
69         unsigned int ebx;
70         unsigned int ecx;
71         unsigned int edx;
72         unsigned int max_leaf;
73         unsigned int op;
74
75         /*
76         * Its assumed that this is called after confirming that Viridian
77         * is present. Query id and revision.
78         */
79         eax = 0;
80         ebx = 0;
81         ecx = 0;
82         edx = 0;
83         op = HVCPUID_VENDOR_MAXFUNCTION;
84         cpuid(op, &eax, &ebx, &ecx, &edx);
85
86         max_leaf = eax;
87
88         if (max_leaf >= HVCPUID_VERSION) {
89                 eax = 0;
90                 ebx = 0;
91                 ecx = 0;
92                 edx = 0;
93                 op = HVCPUID_VERSION;
94                 cpuid(op, &eax, &ebx, &ecx, &edx);
95                 pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n",
96                             eax,
97                             ebx >> 16,
98                             ebx & 0xFFFF,
99                             ecx,
100                             edx >> 24,
101                             edx & 0xFFFFFF);
102         }
103         return max_leaf;
104 }
105
106 /*
107  * do_hypercall- Invoke the specified hypercall
108  */
109 static u64 do_hypercall(u64 control, void *input, void *output)
110 {
111 #ifdef CONFIG_X86_64
112         u64 hv_status = 0;
113         u64 input_address = (input) ? virt_to_phys(input) : 0;
114         u64 output_address = (output) ? virt_to_phys(output) : 0;
115         void *hypercall_page = hv_context.hypercall_page;
116
117         __asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
118         __asm__ __volatile__("call *%3" : "=a" (hv_status) :
119                              "c" (control), "d" (input_address),
120                              "m" (hypercall_page));
121
122         return hv_status;
123
124 #else
125
126         u32 control_hi = control >> 32;
127         u32 control_lo = control & 0xFFFFFFFF;
128         u32 hv_status_hi = 1;
129         u32 hv_status_lo = 1;
130         u64 input_address = (input) ? virt_to_phys(input) : 0;
131         u32 input_address_hi = input_address >> 32;
132         u32 input_address_lo = input_address & 0xFFFFFFFF;
133         u64 output_address = (output) ? virt_to_phys(output) : 0;
134         u32 output_address_hi = output_address >> 32;
135         u32 output_address_lo = output_address & 0xFFFFFFFF;
136         void *hypercall_page = hv_context.hypercall_page;
137
138         __asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
139                               "=a"(hv_status_lo) : "d" (control_hi),
140                               "a" (control_lo), "b" (input_address_hi),
141                               "c" (input_address_lo), "D"(output_address_hi),
142                               "S"(output_address_lo), "m" (hypercall_page));
143
144         return hv_status_lo | ((u64)hv_status_hi << 32);
145 #endif /* !x86_64 */
146 }
147
148 /*
149  * hv_init - Main initialization routine.
150  *
151  * This routine must be called before any other routines in here are called
152  */
153 int hv_init(void)
154 {
155         int max_leaf;
156         union hv_x64_msr_hypercall_contents hypercall_msr;
157         void *virtaddr = NULL;
158
159         memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
160         memset(hv_context.synic_message_page, 0,
161                sizeof(void *) * NR_CPUS);
162
163         if (!query_hypervisor_presence())
164                 goto cleanup;
165
166         max_leaf = query_hypervisor_info();
167
168         /*
169          * Write our OS ID.
170          */
171         hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
172         wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
173
174         /* See if the hypercall page is already set */
175         rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
176
177         virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
178
179         if (!virtaddr)
180                 goto cleanup;
181
182         hypercall_msr.enable = 1;
183
184         hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
185         wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
186
187         /* Confirm that hypercall page did get setup. */
188         hypercall_msr.as_uint64 = 0;
189         rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
190
191         if (!hypercall_msr.enable)
192                 goto cleanup;
193
194         hv_context.hypercall_page = virtaddr;
195
196         /* Setup the global signal event param for the signal event hypercall */
197         hv_context.signal_event_buffer =
198                         kmalloc(sizeof(struct hv_input_signal_event_buffer),
199                                 GFP_KERNEL);
200         if (!hv_context.signal_event_buffer)
201                 goto cleanup;
202
203         hv_context.signal_event_param =
204                 (struct hv_input_signal_event *)
205                         (ALIGN((unsigned long)
206                                   hv_context.signal_event_buffer,
207                                   HV_HYPERCALL_PARAM_ALIGN));
208         hv_context.signal_event_param->connectionid.asu32 = 0;
209         hv_context.signal_event_param->connectionid.u.id =
210                                                 VMBUS_EVENT_CONNECTION_ID;
211         hv_context.signal_event_param->flag_number = 0;
212         hv_context.signal_event_param->rsvdz = 0;
213
214         return 0;
215
216 cleanup:
217         if (virtaddr) {
218                 if (hypercall_msr.enable) {
219                         hypercall_msr.as_uint64 = 0;
220                         wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
221                 }
222
223                 vfree(virtaddr);
224         }
225
226         return -ENOTSUPP;
227 }
228
229 /*
230  * hv_cleanup - Cleanup routine.
231  *
232  * This routine is called normally during driver unloading or exiting.
233  */
234 void hv_cleanup(void)
235 {
236         union hv_x64_msr_hypercall_contents hypercall_msr;
237
238         /* Reset our OS id */
239         wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
240
241         kfree(hv_context.signal_event_buffer);
242         hv_context.signal_event_buffer = NULL;
243         hv_context.signal_event_param = NULL;
244
245         if (hv_context.hypercall_page) {
246                 hypercall_msr.as_uint64 = 0;
247                 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
248                 vfree(hv_context.hypercall_page);
249                 hv_context.hypercall_page = NULL;
250         }
251 }
252
253 /*
254  * hv_post_message - Post a message using the hypervisor message IPC.
255  *
256  * This involves a hypercall.
257  */
258 int hv_post_message(union hv_connection_id connection_id,
259                   enum hv_message_type message_type,
260                   void *payload, size_t payload_size)
261 {
262         struct aligned_input {
263                 u64 alignment8;
264                 struct hv_input_post_message msg;
265         };
266
267         struct hv_input_post_message *aligned_msg;
268         u16 status;
269         unsigned long addr;
270
271         if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
272                 return -EMSGSIZE;
273
274         addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
275         if (!addr)
276                 return -ENOMEM;
277
278         aligned_msg = (struct hv_input_post_message *)
279                         (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
280
281         aligned_msg->connectionid = connection_id;
282         aligned_msg->message_type = message_type;
283         aligned_msg->payload_size = payload_size;
284         memcpy((void *)aligned_msg->payload, payload, payload_size);
285
286         status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
287                 & 0xFFFF;
288
289         kfree((void *)addr);
290
291         return status;
292 }
293
294
295 /*
296  * hv_signal_event -
297  * Signal an event on the specified connection using the hypervisor event IPC.
298  *
299  * This involves a hypercall.
300  */
301 u16 hv_signal_event(void)
302 {
303         u16 status;
304
305         status = do_hypercall(HVCALL_SIGNAL_EVENT,
306                                hv_context.signal_event_param,
307                                NULL) & 0xFFFF;
308         return status;
309 }
310
311 /*
312  * hv_synic_init - Initialize the Synthethic Interrupt Controller.
313  *
314  * If it is already initialized by another entity (ie x2v shim), we need to
315  * retrieve the initialized message and event pages.  Otherwise, we create and
316  * initialize the message and event pages.
317  */
318 void hv_synic_init(void *irqarg)
319 {
320         u64 version;
321         union hv_synic_simp simp;
322         union hv_synic_siefp siefp;
323         union hv_synic_sint shared_sint;
324         union hv_synic_scontrol sctrl;
325
326         u32 irq_vector = *((u32 *)(irqarg));
327         int cpu = smp_processor_id();
328
329         if (!hv_context.hypercall_page)
330                 return;
331
332         /* Check the version */
333         rdmsrl(HV_X64_MSR_SVERSION, version);
334
335         hv_context.synic_message_page[cpu] =
336                 (void *)get_zeroed_page(GFP_ATOMIC);
337
338         if (hv_context.synic_message_page[cpu] == NULL) {
339                 pr_err("Unable to allocate SYNIC message page\n");
340                 goto cleanup;
341         }
342
343         hv_context.synic_event_page[cpu] =
344                 (void *)get_zeroed_page(GFP_ATOMIC);
345
346         if (hv_context.synic_event_page[cpu] == NULL) {
347                 pr_err("Unable to allocate SYNIC event page\n");
348                 goto cleanup;
349         }
350
351         /* Setup the Synic's message page */
352         rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
353         simp.simp_enabled = 1;
354         simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
355                 >> PAGE_SHIFT;
356
357         wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
358
359         /* Setup the Synic's event page */
360         rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
361         siefp.siefp_enabled = 1;
362         siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
363                 >> PAGE_SHIFT;
364
365         wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
366
367         /* Setup the shared SINT. */
368         rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
369
370         shared_sint.as_uint64 = 0;
371         shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
372         shared_sint.masked = false;
373         shared_sint.auto_eoi = false;
374
375         wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
376
377         /* Enable the global synic bit */
378         rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
379         sctrl.enable = 1;
380
381         wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
382
383         hv_context.synic_initialized = true;
384         return;
385
386 cleanup:
387         if (hv_context.synic_event_page[cpu])
388                 free_page((unsigned long)hv_context.synic_event_page[cpu]);
389
390         if (hv_context.synic_message_page[cpu])
391                 free_page((unsigned long)hv_context.synic_message_page[cpu]);
392         return;
393 }
394
395 /*
396  * hv_synic_cleanup - Cleanup routine for hv_synic_init().
397  */
398 void hv_synic_cleanup(void *arg)
399 {
400         union hv_synic_sint shared_sint;
401         union hv_synic_simp simp;
402         union hv_synic_siefp siefp;
403         int cpu = smp_processor_id();
404
405         if (!hv_context.synic_initialized)
406                 return;
407
408         rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
409
410         shared_sint.masked = 1;
411
412         /* Need to correctly cleanup in the case of SMP!!! */
413         /* Disable the interrupt */
414         wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
415
416         rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
417         simp.simp_enabled = 0;
418         simp.base_simp_gpa = 0;
419
420         wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
421
422         rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
423         siefp.siefp_enabled = 0;
424         siefp.base_siefp_gpa = 0;
425
426         wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
427
428         free_page((unsigned long)hv_context.synic_message_page[cpu]);
429         free_page((unsigned long)hv_context.synic_event_page[cpu]);
430 }