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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/hv/hyperv_vmbus.h
....@@ -1,25 +1,12 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  *
34  * Copyright (c) 2011, Microsoft Corporation.
4
- *
5
- * This program is free software; you can redistribute it and/or modify it
6
- * under the terms and conditions of the GNU General Public License,
7
- * version 2, as published by the Free Software Foundation.
8
- *
9
- * This program is distributed in the hope it will be useful, but WITHOUT
10
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12
- * more details.
13
- *
14
- * You should have received a copy of the GNU General Public License along with
15
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16
- * Place - Suite 330, Boston, MA 02111-1307 USA.
175  *
186  * Authors:
197  *   Haiyang Zhang <haiyangz@microsoft.com>
208  *   Hank Janssen  <hjanssen@microsoft.com>
219  *   K. Y. Srinivasan <kys@microsoft.com>
22
- *
2310  */
2411 
2512 #ifndef _HYPERV_VMBUS_H
....@@ -45,74 +32,6 @@
4532  */
4633 #define HV_UTIL_NEGO_TIMEOUT 55
4734 
48
-/* Define synthetic interrupt controller flag constants. */
49
-#define HV_EVENT_FLAGS_COUNT		(256 * 8)
50
-#define HV_EVENT_FLAGS_LONG_COUNT	(256 / sizeof(unsigned long))
51
-
52
-/*
53
- * Timer configuration register.
54
- */
55
-union hv_timer_config {
56
-	u64 as_uint64;
57
-	struct {
58
-		u64 enable:1;
59
-		u64 periodic:1;
60
-		u64 lazy:1;
61
-		u64 auto_enable:1;
62
-		u64 apic_vector:8;
63
-		u64 direct_mode:1;
64
-		u64 reserved_z0:3;
65
-		u64 sintx:4;
66
-		u64 reserved_z1:44;
67
-	};
68
-};
69
-
70
-
71
-/* Define the synthetic interrupt controller event flags format. */
72
-union hv_synic_event_flags {
73
-	unsigned long flags[HV_EVENT_FLAGS_LONG_COUNT];
74
-};
75
-
76
-/* Define SynIC control register. */
77
-union hv_synic_scontrol {
78
-	u64 as_uint64;
79
-	struct {
80
-		u64 enable:1;
81
-		u64 reserved:63;
82
-	};
83
-};
84
-
85
-/* Define synthetic interrupt source. */
86
-union hv_synic_sint {
87
-	u64 as_uint64;
88
-	struct {
89
-		u64 vector:8;
90
-		u64 reserved1:8;
91
-		u64 masked:1;
92
-		u64 auto_eoi:1;
93
-		u64 reserved2:46;
94
-	};
95
-};
96
-
97
-/* Define the format of the SIMP register */
98
-union hv_synic_simp {
99
-	u64 as_uint64;
100
-	struct {
101
-		u64 simp_enabled:1;
102
-		u64 preserved:11;
103
-		u64 base_simp_gpa:52;
104
-	};
105
-};
106
-
107
-/* Define the format of the SIEFP register */
108
-union hv_synic_siefp {
109
-	u64 as_uint64;
110
-	struct {
111
-		u64 siefp_enabled:1;
112
-		u64 preserved:11;
113
-		u64 base_siefp_gpa:52;
114
-	};
115
-};
11635 
11736 /* Definitions for the monitored notification facility */
11837 union hv_monitor_trigger_group {
....@@ -214,13 +133,6 @@
214133 	 * basis.
215134 	 */
216135 	struct tasklet_struct msg_dpc;
217
-
218
-	/*
219
-	 * To optimize the mapping of relid to channel, maintain
220
-	 * per-cpu list of the channels based on their CPU affinity.
221
-	 */
222
-	struct list_head chan_list;
223
-	struct clock_event_device *clk_evt;
224136 };
225137 
226138 struct hv_context {
....@@ -228,10 +140,6 @@
228140 	 * So at this point this really can only contain the Hyper-V ID
229141 	 */
230142 	u64 guestid;
231
-
232
-	void *tsc_page;
233
-
234
-	bool synic_initialized;
235143 
236144 	struct hv_per_cpu_context __percpu *cpu_context;
237145 
....@@ -256,14 +164,15 @@
256164 
257165 extern void hv_synic_free(void);
258166 
167
+extern void hv_synic_enable_regs(unsigned int cpu);
259168 extern int hv_synic_init(unsigned int cpu);
260169 
170
+extern void hv_synic_disable_regs(unsigned int cpu);
261171 extern int hv_synic_cleanup(unsigned int cpu);
262
-
263
-extern void hv_synic_clockevents_cleanup(void);
264172 
265173 /* Interface */
266174 
175
+void hv_ringbuffer_pre_init(struct vmbus_channel *channel);
267176 
268177 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
269178 		       struct page *pages, u32 pagecnt);
....@@ -278,16 +187,18 @@
278187 		       u64 *requestid, bool raw);
279188 
280189 /*
281
- * Maximum channels is determined by the size of the interrupt page
282
- * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
283
- * and the other is receive endpoint interrupt
190
+ * The Maximum number of channels (16348) is determined by the size of the
191
+ * interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
192
+ * send endpoint interrupts, and the other is to receive endpoint interrupts.
284193  */
285
-#define MAX_NUM_CHANNELS	((PAGE_SIZE >> 1) << 3)	/* 16348 channels */
194
+#define MAX_NUM_CHANNELS	((HV_HYP_PAGE_SIZE >> 1) << 3)
286195 
287196 /* The value here must be in multiple of 32 */
288197 /* TODO: Need to make this configurable */
289198 #define MAX_NUM_CHANNELS_SUPPORTED	256
290199 
200
+#define MAX_CHANNEL_RELIDS					\
201
+	max(MAX_NUM_CHANNELS_SUPPORTED, HV_EVENT_FLAGS_COUNT)
291202 
292203 enum vmbus_connect_state {
293204 	DISCONNECTED,
....@@ -298,12 +209,13 @@
298209 
299210 #define MAX_SIZE_CHANNEL_MESSAGE	HV_MESSAGE_PAYLOAD_BYTE_COUNT
300211 
301
-struct vmbus_connection {
302
-	/*
303
-	 * CPU on which the initial host contact was made.
304
-	 */
305
-	int connect_cpu;
212
+/*
213
+ * The CPU that Hyper-V will interrupt for VMBUS messages, such as
214
+ * CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER.
215
+ */
216
+#define VMBUS_CONNECT_CPU	0
306217 
218
+struct vmbus_connection {
307219 	u32 msg_conn_id;
308220 
309221 	atomic_t offer_in_progress;
....@@ -336,6 +248,9 @@
336248 	struct list_head chn_list;
337249 	struct mutex channel_mutex;
338250 
251
+	/* Array of channels */
252
+	struct vmbus_channel **channels;
253
+
339254 	/*
340255 	 * An offer message is handled first on the work_queue, and then
341256 	 * is further handled on handle_primary_chan_wq or
....@@ -344,6 +259,32 @@
344259 	struct workqueue_struct *work_queue;
345260 	struct workqueue_struct *handle_primary_chan_wq;
346261 	struct workqueue_struct *handle_sub_chan_wq;
262
+
263
+	/*
264
+	 * The number of sub-channels and hv_sock channels that should be
265
+	 * cleaned up upon suspend: sub-channels will be re-created upon
266
+	 * resume, and hv_sock channels should not survive suspend.
267
+	 */
268
+	atomic_t nr_chan_close_on_suspend;
269
+	/*
270
+	 * vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to
271
+	 * drop to zero.
272
+	 */
273
+	struct completion ready_for_suspend_event;
274
+
275
+	/*
276
+	 * The number of primary channels that should be "fixed up"
277
+	 * upon resume: these channels are re-offered upon resume, and some
278
+	 * fields of the channel offers (i.e. child_relid and connection_id)
279
+	 * can change, so the old offermsg must be fixed up, before the resume
280
+	 * callbacks of the VSC drivers start to further touch the channels.
281
+	 */
282
+	atomic_t nr_chan_fixup_on_resume;
283
+	/*
284
+	 * vmbus_bus_resume() waits for "nr_chan_fixup_on_resume" to
285
+	 * drop to zero.
286
+	 */
287
+	struct completion ready_for_resume_event;
347288 };
348289 
349290 
....@@ -352,11 +293,13 @@
352293 	struct list_head msglist_entry;
353294 
354295 	/* The message itself */
355
-	unsigned char msg[0];
296
+	unsigned char msg[];
356297 };
357298 
358299 
359300 extern struct vmbus_connection vmbus_connection;
301
+
302
+int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version);
360303 
361304 static inline void vmbus_send_interrupt(u32 relid)
362305 {
....@@ -375,6 +318,7 @@
375318 	enum vmbus_channel_message_type message_type;
376319 	enum vmbus_message_handler_type handler_type;
377320 	void (*message_handler)(struct vmbus_channel_message_header *msg);
321
+	u32 min_payload_len;
378322 };
379323 
380324 extern const struct vmbus_channel_message_table_entry
....@@ -383,8 +327,8 @@
383327 
384328 /* General vmbus interface */
385329 
386
-struct hv_device *vmbus_device_create(const uuid_le *type,
387
-				      const uuid_le *instance,
330
+struct hv_device *vmbus_device_create(const guid_t *type,
331
+				      const guid_t *instance,
388332 				      struct vmbus_channel *channel);
389333 
390334 int vmbus_device_register(struct hv_device *child_device_obj);
....@@ -393,6 +337,9 @@
393337 			   struct vmbus_channel *channel);
394338 
395339 void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
340
+
341
+void vmbus_channel_map_relid(struct vmbus_channel *channel);
342
+void vmbus_channel_unmap_relid(struct vmbus_channel *channel);
396343 
397344 struct vmbus_channel *relid2channel(u32 relid);
398345 
....@@ -410,14 +357,20 @@
410357 
411358 int hv_kvp_init(struct hv_util_service *srv);
412359 void hv_kvp_deinit(void);
360
+int hv_kvp_pre_suspend(void);
361
+int hv_kvp_pre_resume(void);
413362 void hv_kvp_onchannelcallback(void *context);
414363 
415364 int hv_vss_init(struct hv_util_service *srv);
416365 void hv_vss_deinit(void);
366
+int hv_vss_pre_suspend(void);
367
+int hv_vss_pre_resume(void);
417368 void hv_vss_onchannelcallback(void *context);
418369 
419370 int hv_fcopy_init(struct hv_util_service *srv);
420371 void hv_fcopy_deinit(void);
372
+int hv_fcopy_pre_suspend(void);
373
+int hv_fcopy_pre_resume(void);
421374 void hv_fcopy_onchannelcallback(void *context);
422375 void vmbus_initiate_unload(bool crash);
423376 
....@@ -426,12 +379,7 @@
426379 {
427380 	if (!channel)
428381 		return;
429
-
430
-	if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
431
-		cb(channel);
432
-		return;
433
-	}
434
-	smp_call_function_single(channel->target_cpu, cb, channel, true);
382
+	cb(channel);
435383 }
436384 
437385 enum hvutil_device_state {
....@@ -443,4 +391,83 @@
443391 	HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
444392 };
445393 
394
+enum delay {
395
+	INTERRUPT_DELAY = 0,
396
+	MESSAGE_DELAY   = 1,
397
+};
398
+
399
+extern const struct vmbus_device vmbus_devs[];
400
+
401
+static inline bool hv_is_perf_channel(struct vmbus_channel *channel)
402
+{
403
+	return vmbus_devs[channel->device_id].perf_device;
404
+}
405
+
406
+static inline bool hv_is_alloced_cpu(unsigned int cpu)
407
+{
408
+	struct vmbus_channel *channel, *sc;
409
+
410
+	lockdep_assert_held(&vmbus_connection.channel_mutex);
411
+	/*
412
+	 * List additions/deletions as well as updates of the target CPUs are
413
+	 * protected by channel_mutex.
414
+	 */
415
+	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
416
+		if (!hv_is_perf_channel(channel))
417
+			continue;
418
+		if (channel->target_cpu == cpu)
419
+			return true;
420
+		list_for_each_entry(sc, &channel->sc_list, sc_list) {
421
+			if (sc->target_cpu == cpu)
422
+				return true;
423
+		}
424
+	}
425
+	return false;
426
+}
427
+
428
+static inline void hv_set_alloced_cpu(unsigned int cpu)
429
+{
430
+	cpumask_set_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
431
+}
432
+
433
+static inline void hv_clear_alloced_cpu(unsigned int cpu)
434
+{
435
+	if (hv_is_alloced_cpu(cpu))
436
+		return;
437
+	cpumask_clear_cpu(cpu, &hv_context.hv_numa_map[cpu_to_node(cpu)]);
438
+}
439
+
440
+static inline void hv_update_alloced_cpus(unsigned int old_cpu,
441
+					  unsigned int new_cpu)
442
+{
443
+	hv_set_alloced_cpu(new_cpu);
444
+	hv_clear_alloced_cpu(old_cpu);
445
+}
446
+
447
+#ifdef CONFIG_HYPERV_TESTING
448
+
449
+int hv_debug_add_dev_dir(struct hv_device *dev);
450
+void hv_debug_rm_dev_dir(struct hv_device *dev);
451
+void hv_debug_rm_all_dir(void);
452
+int hv_debug_init(void);
453
+void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type);
454
+
455
+#else /* CONFIG_HYPERV_TESTING */
456
+
457
+static inline void hv_debug_rm_dev_dir(struct hv_device *dev) {};
458
+static inline void hv_debug_rm_all_dir(void) {};
459
+static inline void hv_debug_delay_test(struct vmbus_channel *channel,
460
+				       enum delay delay_type) {};
461
+static inline int hv_debug_init(void)
462
+{
463
+	return -1;
464
+}
465
+
466
+static inline int hv_debug_add_dev_dir(struct hv_device *dev)
467
+{
468
+	return -1;
469
+}
470
+
471
+#endif /* CONFIG_HYPERV_TESTING */
472
+
446473 #endif /* _HYPERV_VMBUS_H */