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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * IBM Power Systems Virtual Management Channel Support.
4 *
5 * Copyright (c) 2004, 2018 IBM Corp.
6 * Dave Engebretsen engebret@us.ibm.com
7 * Steven Royer seroyer@linux.vnet.ibm.com
8 * Adam Reznechek adreznec@linux.vnet.ibm.com
9 * Bryant G. Ly <bryantly@linux.vnet.ibm.com>
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/kthread.h>
15#include <linux/major.h>
16#include <linux/string.h>
17#include <linux/fcntl.h>
18#include <linux/slab.h>
19#include <linux/poll.h>
20#include <linux/init.h>
21#include <linux/fs.h>
22#include <linux/interrupt.h>
23#include <linux/spinlock.h>
24#include <linux/percpu.h>
25#include <linux/delay.h>
26#include <linux/uaccess.h>
27#include <linux/io.h>
28#include <linux/miscdevice.h>
29#include <linux/sched/signal.h>
30
31#include <asm/byteorder.h>
32#include <asm/irq.h>
33#include <asm/vio.h>
34
35#include "ibmvmc.h"
36
37#define IBMVMC_DRIVER_VERSION "1.0"
38
39/*
40 * Static global variables
41 */
42static DECLARE_WAIT_QUEUE_HEAD(ibmvmc_read_wait);
43
44static const char ibmvmc_driver_name[] = "ibmvmc";
45
46static struct ibmvmc_struct ibmvmc;
47static struct ibmvmc_hmc hmcs[MAX_HMCS];
48static struct crq_server_adapter ibmvmc_adapter;
49
50static int ibmvmc_max_buf_pool_size = DEFAULT_BUF_POOL_SIZE;
51static int ibmvmc_max_hmcs = DEFAULT_HMCS;
52static int ibmvmc_max_mtu = DEFAULT_MTU;
53
54static inline long h_copy_rdma(s64 length, u64 sliobn, u64 slioba,
55 u64 dliobn, u64 dlioba)
56{
57 long rc = 0;
58
59 /* Ensure all writes to source memory are visible before hcall */
60 dma_wmb();
61 pr_debug("ibmvmc: h_copy_rdma(0x%llx, 0x%llx, 0x%llx, 0x%llx, 0x%llx\n",
62 length, sliobn, slioba, dliobn, dlioba);
63 rc = plpar_hcall_norets(H_COPY_RDMA, length, sliobn, slioba,
64 dliobn, dlioba);
65 pr_debug("ibmvmc: h_copy_rdma rc = 0x%lx\n", rc);
66
67 return rc;
68}
69
70static inline void h_free_crq(uint32_t unit_address)
71{
72 long rc = 0;
73
74 do {
75 if (H_IS_LONG_BUSY(rc))
76 msleep(get_longbusy_msecs(rc));
77
78 rc = plpar_hcall_norets(H_FREE_CRQ, unit_address);
79 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
80}
81
82/**
83 * h_request_vmc: - request a hypervisor virtual management channel device
84 * @vmc_index: drc index of the vmc device created
85 *
86 * Requests the hypervisor create a new virtual management channel device,
87 * allowing this partition to send hypervisor virtualization control
88 * commands.
89 *
90 * Return:
91 * 0 - Success
92 * Non-zero - Failure
93 */
94static inline long h_request_vmc(u32 *vmc_index)
95{
96 long rc = 0;
97 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
98
99 do {
100 if (H_IS_LONG_BUSY(rc))
101 msleep(get_longbusy_msecs(rc));
102
103 /* Call to request the VMC device from phyp */
104 rc = plpar_hcall(H_REQUEST_VMC, retbuf);
105 pr_debug("ibmvmc: %s rc = 0x%lx\n", __func__, rc);
106 *vmc_index = retbuf[0];
107 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
108
109 return rc;
110}
111
112/* routines for managing a command/response queue */
113/**
114 * ibmvmc_handle_event: - Interrupt handler for crq events
115 * @irq: number of irq to handle, not used
116 * @dev_instance: crq_server_adapter that received interrupt
117 *
118 * Disables interrupts and schedules ibmvmc_task
119 *
120 * Always returns IRQ_HANDLED
121 */
122static irqreturn_t ibmvmc_handle_event(int irq, void *dev_instance)
123{
124 struct crq_server_adapter *adapter =
125 (struct crq_server_adapter *)dev_instance;
126
127 vio_disable_interrupts(to_vio_dev(adapter->dev));
128 tasklet_schedule(&adapter->work_task);
129
130 return IRQ_HANDLED;
131}
132
133/**
134 * ibmvmc_release_crq_queue - Release CRQ Queue
135 *
136 * @adapter: crq_server_adapter struct
137 *
138 * Return:
139 * 0 - Success
140 * Non-Zero - Failure
141 */
142static void ibmvmc_release_crq_queue(struct crq_server_adapter *adapter)
143{
144 struct vio_dev *vdev = to_vio_dev(adapter->dev);
145 struct crq_queue *queue = &adapter->queue;
146
147 free_irq(vdev->irq, (void *)adapter);
148 tasklet_kill(&adapter->work_task);
149
150 if (adapter->reset_task)
151 kthread_stop(adapter->reset_task);
152
153 h_free_crq(vdev->unit_address);
154 dma_unmap_single(adapter->dev,
155 queue->msg_token,
156 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
157 free_page((unsigned long)queue->msgs);
158}
159
160/**
161 * ibmvmc_reset_crq_queue - Reset CRQ Queue
162 *
163 * @adapter: crq_server_adapter struct
164 *
165 * This function calls h_free_crq and then calls H_REG_CRQ and does all the
166 * bookkeeping to get us back to where we can communicate.
167 *
168 * Return:
169 * 0 - Success
170 * Non-Zero - Failure
171 */
172static int ibmvmc_reset_crq_queue(struct crq_server_adapter *adapter)
173{
174 struct vio_dev *vdev = to_vio_dev(adapter->dev);
175 struct crq_queue *queue = &adapter->queue;
176 int rc = 0;
177
178 /* Close the CRQ */
179 h_free_crq(vdev->unit_address);
180
181 /* Clean out the queue */
182 memset(queue->msgs, 0x00, PAGE_SIZE);
183 queue->cur = 0;
184
185 /* And re-open it again */
186 rc = plpar_hcall_norets(H_REG_CRQ,
187 vdev->unit_address,
188 queue->msg_token, PAGE_SIZE);
189 if (rc == 2)
190 /* Adapter is good, but other end is not ready */
191 dev_warn(adapter->dev, "Partner adapter not ready\n");
192 else if (rc != 0)
193 dev_err(adapter->dev, "couldn't register crq--rc 0x%x\n", rc);
194
195 return rc;
196}
197
198/**
199 * crq_queue_next_crq: - Returns the next entry in message queue
200 * @queue: crq_queue to use
201 *
202 * Returns pointer to next entry in queue, or NULL if there are no new
203 * entried in the CRQ.
204 */
205static struct ibmvmc_crq_msg *crq_queue_next_crq(struct crq_queue *queue)
206{
207 struct ibmvmc_crq_msg *crq;
208 unsigned long flags;
209
210 spin_lock_irqsave(&queue->lock, flags);
211 crq = &queue->msgs[queue->cur];
212 if (crq->valid & 0x80) {
213 if (++queue->cur == queue->size)
214 queue->cur = 0;
215
216 /* Ensure the read of the valid bit occurs before reading any
217 * other bits of the CRQ entry
218 */
219 dma_rmb();
220 } else {
221 crq = NULL;
222 }
223
224 spin_unlock_irqrestore(&queue->lock, flags);
225
226 return crq;
227}
228
229/**
230 * ibmvmc_send_crq - Send CRQ
231 *
232 * @adapter: crq_server_adapter struct
233 * @word1: Word1 Data field
234 * @word2: Word2 Data field
235 *
236 * Return:
237 * 0 - Success
238 * Non-Zero - Failure
239 */
240static long ibmvmc_send_crq(struct crq_server_adapter *adapter,
241 u64 word1, u64 word2)
242{
243 struct vio_dev *vdev = to_vio_dev(adapter->dev);
244 long rc = 0;
245
246 dev_dbg(adapter->dev, "(0x%x, 0x%016llx, 0x%016llx)\n",
247 vdev->unit_address, word1, word2);
248
249 /*
250 * Ensure the command buffer is flushed to memory before handing it
251 * over to the other side to prevent it from fetching any stale data.
252 */
253 dma_wmb();
254 rc = plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
255 dev_dbg(adapter->dev, "rc = 0x%lx\n", rc);
256
257 return rc;
258}
259
260/**
261 * alloc_dma_buffer - Create DMA Buffer
262 *
263 * @vdev: vio_dev struct
264 * @size: Size field
265 * @dma_handle: DMA address field
266 *
267 * Allocates memory for the command queue and maps remote memory into an
268 * ioba.
269 *
270 * Returns a pointer to the buffer
271 */
272static void *alloc_dma_buffer(struct vio_dev *vdev, size_t size,
273 dma_addr_t *dma_handle)
274{
275 /* allocate memory */
276 void *buffer = kzalloc(size, GFP_KERNEL);
277
278 if (!buffer) {
279 *dma_handle = 0;
280 return NULL;
281 }
282
283 /* DMA map */
284 *dma_handle = dma_map_single(&vdev->dev, buffer, size,
285 DMA_BIDIRECTIONAL);
286
287 if (dma_mapping_error(&vdev->dev, *dma_handle)) {
288 *dma_handle = 0;
289 kzfree(buffer);
290 return NULL;
291 }
292
293 return buffer;
294}
295
296/**
297 * free_dma_buffer - Free DMA Buffer
298 *
299 * @vdev: vio_dev struct
300 * @size: Size field
301 * @vaddr: Address field
302 * @dma_handle: DMA address field
303 *
304 * Releases memory for a command queue and unmaps mapped remote memory.
305 */
306static void free_dma_buffer(struct vio_dev *vdev, size_t size, void *vaddr,
307 dma_addr_t dma_handle)
308{
309 /* DMA unmap */
310 dma_unmap_single(&vdev->dev, dma_handle, size, DMA_BIDIRECTIONAL);
311
312 /* deallocate memory */
313 kzfree(vaddr);
314}
315
316/**
317 * ibmvmc_get_valid_hmc_buffer - Retrieve Valid HMC Buffer
318 *
319 * @hmc_index: HMC Index Field
320 *
321 * Return:
322 * Pointer to ibmvmc_buffer
323 */
324static struct ibmvmc_buffer *ibmvmc_get_valid_hmc_buffer(u8 hmc_index)
325{
326 struct ibmvmc_buffer *buffer;
327 struct ibmvmc_buffer *ret_buf = NULL;
328 unsigned long i;
329
330 if (hmc_index > ibmvmc.max_hmc_index)
331 return NULL;
332
333 buffer = hmcs[hmc_index].buffer;
334
335 for (i = 0; i < ibmvmc_max_buf_pool_size; i++) {
336 if (buffer[i].valid && buffer[i].free &&
337 buffer[i].owner == VMC_BUF_OWNER_ALPHA) {
338 buffer[i].free = 0;
339 ret_buf = &buffer[i];
340 break;
341 }
342 }
343
344 return ret_buf;
345}
346
347/**
348 * ibmvmc_get_free_hmc_buffer - Get Free HMC Buffer
349 *
350 * @adapter: crq_server_adapter struct
351 * @hmc_index: Hmc Index field
352 *
353 * Return:
354 * Pointer to ibmvmc_buffer
355 */
356static struct ibmvmc_buffer *ibmvmc_get_free_hmc_buffer(struct crq_server_adapter *adapter,
357 u8 hmc_index)
358{
359 struct ibmvmc_buffer *buffer;
360 struct ibmvmc_buffer *ret_buf = NULL;
361 unsigned long i;
362
363 if (hmc_index > ibmvmc.max_hmc_index) {
364 dev_info(adapter->dev, "get_free_hmc_buffer: invalid hmc_index=0x%x\n",
365 hmc_index);
366 return NULL;
367 }
368
369 buffer = hmcs[hmc_index].buffer;
370
371 for (i = 0; i < ibmvmc_max_buf_pool_size; i++) {
372 if (buffer[i].free &&
373 buffer[i].owner == VMC_BUF_OWNER_ALPHA) {
374 buffer[i].free = 0;
375 ret_buf = &buffer[i];
376 break;
377 }
378 }
379
380 return ret_buf;
381}
382
383/**
384 * ibmvmc_free_hmc_buffer - Free an HMC Buffer
385 *
386 * @hmc: ibmvmc_hmc struct
387 * @buffer: ibmvmc_buffer struct
388 *
389 */
390static void ibmvmc_free_hmc_buffer(struct ibmvmc_hmc *hmc,
391 struct ibmvmc_buffer *buffer)
392{
393 unsigned long flags;
394
395 spin_lock_irqsave(&hmc->lock, flags);
396 buffer->free = 1;
397 spin_unlock_irqrestore(&hmc->lock, flags);
398}
399
400/**
401 * ibmvmc_count_hmc_buffers - Count HMC Buffers
402 *
403 * @hmc_index: HMC Index field
404 * @valid: Valid number of buffers field
405 * @free: Free number of buffers field
406 *
407 */
408static void ibmvmc_count_hmc_buffers(u8 hmc_index, unsigned int *valid,
409 unsigned int *free)
410{
411 struct ibmvmc_buffer *buffer;
412 unsigned long i;
413 unsigned long flags;
414
415 if (hmc_index > ibmvmc.max_hmc_index)
416 return;
417
418 if (!valid || !free)
419 return;
420
421 *valid = 0; *free = 0;
422
423 buffer = hmcs[hmc_index].buffer;
424 spin_lock_irqsave(&hmcs[hmc_index].lock, flags);
425
426 for (i = 0; i < ibmvmc_max_buf_pool_size; i++) {
427 if (buffer[i].valid) {
428 *valid = *valid + 1;
429 if (buffer[i].free)
430 *free = *free + 1;
431 }
432 }
433
434 spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags);
435}
436
437/**
438 * ibmvmc_get_free_hmc - Get Free HMC
439 *
440 * Return:
441 * Pointer to an available HMC Connection
442 * Null otherwise
443 */
444static struct ibmvmc_hmc *ibmvmc_get_free_hmc(void)
445{
446 unsigned long i;
447 unsigned long flags;
448
449 /*
450 * Find an available HMC connection.
451 */
452 for (i = 0; i <= ibmvmc.max_hmc_index; i++) {
453 spin_lock_irqsave(&hmcs[i].lock, flags);
454 if (hmcs[i].state == ibmhmc_state_free) {
455 hmcs[i].index = i;
456 hmcs[i].state = ibmhmc_state_initial;
457 spin_unlock_irqrestore(&hmcs[i].lock, flags);
458 return &hmcs[i];
459 }
460 spin_unlock_irqrestore(&hmcs[i].lock, flags);
461 }
462
463 return NULL;
464}
465
466/**
467 * ibmvmc_return_hmc - Return an HMC Connection
468 *
469 * @hmc: ibmvmc_hmc struct
470 * @release_readers: Number of readers connected to session
471 *
472 * This function releases the HMC connections back into the pool.
473 *
474 * Return:
475 * 0 - Success
476 * Non-zero - Failure
477 */
478static int ibmvmc_return_hmc(struct ibmvmc_hmc *hmc, bool release_readers)
479{
480 struct ibmvmc_buffer *buffer;
481 struct crq_server_adapter *adapter;
482 struct vio_dev *vdev;
483 unsigned long i;
484 unsigned long flags;
485
486 if (!hmc || !hmc->adapter)
487 return -EIO;
488
489 if (release_readers) {
490 if (hmc->file_session) {
491 struct ibmvmc_file_session *session = hmc->file_session;
492
493 session->valid = 0;
494 wake_up_interruptible(&ibmvmc_read_wait);
495 }
496 }
497
498 adapter = hmc->adapter;
499 vdev = to_vio_dev(adapter->dev);
500
501 spin_lock_irqsave(&hmc->lock, flags);
502 hmc->index = 0;
503 hmc->state = ibmhmc_state_free;
504 hmc->queue_head = 0;
505 hmc->queue_tail = 0;
506 buffer = hmc->buffer;
507 for (i = 0; i < ibmvmc_max_buf_pool_size; i++) {
508 if (buffer[i].valid) {
509 free_dma_buffer(vdev,
510 ibmvmc.max_mtu,
511 buffer[i].real_addr_local,
512 buffer[i].dma_addr_local);
513 dev_dbg(adapter->dev, "Forgot buffer id 0x%lx\n", i);
514 }
515 memset(&buffer[i], 0, sizeof(struct ibmvmc_buffer));
516
517 hmc->queue_outbound_msgs[i] = VMC_INVALID_BUFFER_ID;
518 }
519
520 spin_unlock_irqrestore(&hmc->lock, flags);
521
522 return 0;
523}
524
525/**
526 * ibmvmc_send_open - Interface Open
527 * @buffer: Pointer to ibmvmc_buffer struct
528 * @hmc: Pointer to ibmvmc_hmc struct
529 *
530 * This command is sent by the management partition as the result of a
531 * management partition device request. It causes the hypervisor to
532 * prepare a set of data buffers for the management application connection
533 * indicated HMC idx. A unique HMC Idx would be used if multiple management
534 * applications running concurrently were desired. Before responding to this
535 * command, the hypervisor must provide the management partition with at
536 * least one of these new buffers via the Add Buffer. This indicates whether
537 * the messages are inbound or outbound from the hypervisor.
538 *
539 * Return:
540 * 0 - Success
541 * Non-zero - Failure
542 */
543static int ibmvmc_send_open(struct ibmvmc_buffer *buffer,
544 struct ibmvmc_hmc *hmc)
545{
546 struct ibmvmc_crq_msg crq_msg;
547 struct crq_server_adapter *adapter;
548 __be64 *crq_as_u64 = (__be64 *)&crq_msg;
549 int rc = 0;
550
551 if (!hmc || !hmc->adapter)
552 return -EIO;
553
554 adapter = hmc->adapter;
555
556 dev_dbg(adapter->dev, "send_open: 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
557 (unsigned long)buffer->size, (unsigned long)adapter->liobn,
558 (unsigned long)buffer->dma_addr_local,
559 (unsigned long)adapter->riobn,
560 (unsigned long)buffer->dma_addr_remote);
561
562 rc = h_copy_rdma(buffer->size,
563 adapter->liobn,
564 buffer->dma_addr_local,
565 adapter->riobn,
566 buffer->dma_addr_remote);
567 if (rc) {
568 dev_err(adapter->dev, "Error: In send_open, h_copy_rdma rc 0x%x\n",
569 rc);
570 return -EIO;
571 }
572
573 hmc->state = ibmhmc_state_opening;
574
575 crq_msg.valid = 0x80;
576 crq_msg.type = VMC_MSG_OPEN;
577 crq_msg.status = 0;
578 crq_msg.var1.rsvd = 0;
579 crq_msg.hmc_session = hmc->session;
580 crq_msg.hmc_index = hmc->index;
581 crq_msg.var2.buffer_id = cpu_to_be16(buffer->id);
582 crq_msg.rsvd = 0;
583 crq_msg.var3.rsvd = 0;
584
585 ibmvmc_send_crq(adapter, be64_to_cpu(crq_as_u64[0]),
586 be64_to_cpu(crq_as_u64[1]));
587
588 return rc;
589}
590
591/**
592 * ibmvmc_send_close - Interface Close
593 * @hmc: Pointer to ibmvmc_hmc struct
594 *
595 * This command is sent by the management partition to terminate a
596 * management application to hypervisor connection. When this command is
597 * sent, the management partition has quiesced all I/O operations to all
598 * buffers associated with this management application connection, and
599 * has freed any storage for these buffers.
600 *
601 * Return:
602 * 0 - Success
603 * Non-zero - Failure
604 */
605static int ibmvmc_send_close(struct ibmvmc_hmc *hmc)
606{
607 struct ibmvmc_crq_msg crq_msg;
608 struct crq_server_adapter *adapter;
609 __be64 *crq_as_u64 = (__be64 *)&crq_msg;
610 int rc = 0;
611
612 if (!hmc || !hmc->adapter)
613 return -EIO;
614
615 adapter = hmc->adapter;
616
617 dev_info(adapter->dev, "CRQ send: close\n");
618
619 crq_msg.valid = 0x80;
620 crq_msg.type = VMC_MSG_CLOSE;
621 crq_msg.status = 0;
622 crq_msg.var1.rsvd = 0;
623 crq_msg.hmc_session = hmc->session;
624 crq_msg.hmc_index = hmc->index;
625 crq_msg.var2.rsvd = 0;
626 crq_msg.rsvd = 0;
627 crq_msg.var3.rsvd = 0;
628
629 ibmvmc_send_crq(adapter, be64_to_cpu(crq_as_u64[0]),
630 be64_to_cpu(crq_as_u64[1]));
631
632 return rc;
633}
634
635/**
636 * ibmvmc_send_capabilities - Send VMC Capabilities
637 *
638 * @adapter: crq_server_adapter struct
639 *
640 * The capabilities message is an administrative message sent after the CRQ
641 * initialization sequence of messages and is used to exchange VMC capabilities
642 * between the management partition and the hypervisor. The management
643 * partition must send this message and the hypervisor must respond with VMC
644 * capabilities Response message before HMC interface message can begin. Any
645 * HMC interface messages received before the exchange of capabilities has
646 * complete are dropped.
647 *
648 * Return:
649 * 0 - Success
650 */
651static int ibmvmc_send_capabilities(struct crq_server_adapter *adapter)
652{
653 struct ibmvmc_admin_crq_msg crq_msg;
654 __be64 *crq_as_u64 = (__be64 *)&crq_msg;
655
656 dev_dbg(adapter->dev, "ibmvmc: CRQ send: capabilities\n");
657 crq_msg.valid = 0x80;
658 crq_msg.type = VMC_MSG_CAP;
659 crq_msg.status = 0;
660 crq_msg.rsvd[0] = 0;
661 crq_msg.rsvd[1] = 0;
662 crq_msg.max_hmc = ibmvmc_max_hmcs;
663 crq_msg.max_mtu = cpu_to_be32(ibmvmc_max_mtu);
664 crq_msg.pool_size = cpu_to_be16(ibmvmc_max_buf_pool_size);
665 crq_msg.crq_size = cpu_to_be16(adapter->queue.size);
666 crq_msg.version = cpu_to_be16(IBMVMC_PROTOCOL_VERSION);
667
668 ibmvmc_send_crq(adapter, be64_to_cpu(crq_as_u64[0]),
669 be64_to_cpu(crq_as_u64[1]));
670
671 ibmvmc.state = ibmvmc_state_capabilities;
672
673 return 0;
674}
675
676/**
677 * ibmvmc_send_add_buffer_resp - Add Buffer Response
678 *
679 * @adapter: crq_server_adapter struct
680 * @status: Status field
681 * @hmc_session: HMC Session field
682 * @hmc_index: HMC Index field
683 * @buffer_id: Buffer Id field
684 *
685 * This command is sent by the management partition to the hypervisor in
686 * response to the Add Buffer message. The Status field indicates the result of
687 * the command.
688 *
689 * Return:
690 * 0 - Success
691 */
692static int ibmvmc_send_add_buffer_resp(struct crq_server_adapter *adapter,
693 u8 status, u8 hmc_session,
694 u8 hmc_index, u16 buffer_id)
695{
696 struct ibmvmc_crq_msg crq_msg;
697 __be64 *crq_as_u64 = (__be64 *)&crq_msg;
698
699 dev_dbg(adapter->dev, "CRQ send: add_buffer_resp\n");
700 crq_msg.valid = 0x80;
701 crq_msg.type = VMC_MSG_ADD_BUF_RESP;
702 crq_msg.status = status;
703 crq_msg.var1.rsvd = 0;
704 crq_msg.hmc_session = hmc_session;
705 crq_msg.hmc_index = hmc_index;
706 crq_msg.var2.buffer_id = cpu_to_be16(buffer_id);
707 crq_msg.rsvd = 0;
708 crq_msg.var3.rsvd = 0;
709
710 ibmvmc_send_crq(adapter, be64_to_cpu(crq_as_u64[0]),
711 be64_to_cpu(crq_as_u64[1]));
712
713 return 0;
714}
715
716/**
717 * ibmvmc_send_rem_buffer_resp - Remove Buffer Response
718 *
719 * @adapter: crq_server_adapter struct
720 * @status: Status field
721 * @hmc_session: HMC Session field
722 * @hmc_index: HMC Index field
723 * @buffer_id: Buffer Id field
724 *
725 * This command is sent by the management partition to the hypervisor in
726 * response to the Remove Buffer message. The Buffer ID field indicates
727 * which buffer the management partition selected to remove. The Status
728 * field indicates the result of the command.
729 *
730 * Return:
731 * 0 - Success
732 */
733static int ibmvmc_send_rem_buffer_resp(struct crq_server_adapter *adapter,
734 u8 status, u8 hmc_session,
735 u8 hmc_index, u16 buffer_id)
736{
737 struct ibmvmc_crq_msg crq_msg;
738 __be64 *crq_as_u64 = (__be64 *)&crq_msg;
739
740 dev_dbg(adapter->dev, "CRQ send: rem_buffer_resp\n");
741 crq_msg.valid = 0x80;
742 crq_msg.type = VMC_MSG_REM_BUF_RESP;
743 crq_msg.status = status;
744 crq_msg.var1.rsvd = 0;
745 crq_msg.hmc_session = hmc_session;
746 crq_msg.hmc_index = hmc_index;
747 crq_msg.var2.buffer_id = cpu_to_be16(buffer_id);
748 crq_msg.rsvd = 0;
749 crq_msg.var3.rsvd = 0;
750
751 ibmvmc_send_crq(adapter, be64_to_cpu(crq_as_u64[0]),
752 be64_to_cpu(crq_as_u64[1]));
753
754 return 0;
755}
756
757/**
758 * ibmvmc_send_msg - Signal Message
759 *
760 * @adapter: crq_server_adapter struct
761 * @buffer: ibmvmc_buffer struct
762 * @hmc: ibmvmc_hmc struct
763 * @msg_length: message length field
764 *
765 * This command is sent between the management partition and the hypervisor
766 * in order to signal the arrival of an HMC protocol message. The command
767 * can be sent by both the management partition and the hypervisor. It is
768 * used for all traffic between the management application and the hypervisor,
769 * regardless of who initiated the communication.
770 *
771 * There is no response to this message.
772 *
773 * Return:
774 * 0 - Success
775 * Non-zero - Failure
776 */
777static int ibmvmc_send_msg(struct crq_server_adapter *adapter,
778 struct ibmvmc_buffer *buffer,
779 struct ibmvmc_hmc *hmc, int msg_len)
780{
781 struct ibmvmc_crq_msg crq_msg;
782 __be64 *crq_as_u64 = (__be64 *)&crq_msg;
783 int rc = 0;
784
785 dev_dbg(adapter->dev, "CRQ send: rdma to HV\n");
786 rc = h_copy_rdma(msg_len,
787 adapter->liobn,
788 buffer->dma_addr_local,
789 adapter->riobn,
790 buffer->dma_addr_remote);
791 if (rc) {
792 dev_err(adapter->dev, "Error in send_msg, h_copy_rdma rc 0x%x\n",
793 rc);
794 return rc;
795 }
796
797 crq_msg.valid = 0x80;
798 crq_msg.type = VMC_MSG_SIGNAL;
799 crq_msg.status = 0;
800 crq_msg.var1.rsvd = 0;
801 crq_msg.hmc_session = hmc->session;
802 crq_msg.hmc_index = hmc->index;
803 crq_msg.var2.buffer_id = cpu_to_be16(buffer->id);
804 crq_msg.var3.msg_len = cpu_to_be32(msg_len);
805 dev_dbg(adapter->dev, "CRQ send: msg to HV 0x%llx 0x%llx\n",
806 be64_to_cpu(crq_as_u64[0]), be64_to_cpu(crq_as_u64[1]));
807
808 buffer->owner = VMC_BUF_OWNER_HV;
809 ibmvmc_send_crq(adapter, be64_to_cpu(crq_as_u64[0]),
810 be64_to_cpu(crq_as_u64[1]));
811
812 return rc;
813}
814
815/**
816 * ibmvmc_open - Open Session
817 *
818 * @inode: inode struct
819 * @file: file struct
820 *
821 * Return:
822 * 0 - Success
823 */
824static int ibmvmc_open(struct inode *inode, struct file *file)
825{
826 struct ibmvmc_file_session *session;
827 int rc = 0;
828
829 pr_debug("%s: inode = 0x%lx, file = 0x%lx, state = 0x%x\n", __func__,
830 (unsigned long)inode, (unsigned long)file,
831 ibmvmc.state);
832
833 session = kzalloc(sizeof(*session), GFP_KERNEL);
834 session->file = file;
835 file->private_data = session;
836
837 return rc;
838}
839
840/**
841 * ibmvmc_close - Close Session
842 *
843 * @inode: inode struct
844 * @file: file struct
845 *
846 * Return:
847 * 0 - Success
848 * Non-zero - Failure
849 */
850static int ibmvmc_close(struct inode *inode, struct file *file)
851{
852 struct ibmvmc_file_session *session;
853 struct ibmvmc_hmc *hmc;
854 int rc = 0;
855 unsigned long flags;
856
857 pr_debug("%s: file = 0x%lx, state = 0x%x\n", __func__,
858 (unsigned long)file, ibmvmc.state);
859
860 session = file->private_data;
861 if (!session)
862 return -EIO;
863
864 hmc = session->hmc;
865 if (hmc) {
866 if (!hmc->adapter)
867 return -EIO;
868
869 if (ibmvmc.state == ibmvmc_state_failed) {
870 dev_warn(hmc->adapter->dev, "close: state_failed\n");
871 return -EIO;
872 }
873
874 spin_lock_irqsave(&hmc->lock, flags);
875 if (hmc->state >= ibmhmc_state_opening) {
876 rc = ibmvmc_send_close(hmc);
877 if (rc)
878 dev_warn(hmc->adapter->dev, "close: send_close failed.\n");
879 }
880 spin_unlock_irqrestore(&hmc->lock, flags);
881 }
882
883 kzfree(session);
884
885 return rc;
886}
887
888/**
889 * ibmvmc_read - Read
890 *
891 * @file: file struct
892 * @buf: Character buffer
893 * @nbytes: Size in bytes
894 * @ppos: Offset
895 *
896 * Return:
897 * 0 - Success
898 * Non-zero - Failure
899 */
900static ssize_t ibmvmc_read(struct file *file, char *buf, size_t nbytes,
901 loff_t *ppos)
902{
903 struct ibmvmc_file_session *session;
904 struct ibmvmc_hmc *hmc;
905 struct crq_server_adapter *adapter;
906 struct ibmvmc_buffer *buffer;
907 ssize_t n;
908 ssize_t retval = 0;
909 unsigned long flags;
910 DEFINE_WAIT(wait);
911
912 pr_debug("ibmvmc: read: file = 0x%lx, buf = 0x%lx, nbytes = 0x%lx\n",
913 (unsigned long)file, (unsigned long)buf,
914 (unsigned long)nbytes);
915
916 if (nbytes == 0)
917 return 0;
918
919 if (nbytes > ibmvmc.max_mtu) {
920 pr_warn("ibmvmc: read: nbytes invalid 0x%x\n",
921 (unsigned int)nbytes);
922 return -EINVAL;
923 }
924
925 session = file->private_data;
926 if (!session) {
927 pr_warn("ibmvmc: read: no session\n");
928 return -EIO;
929 }
930
931 hmc = session->hmc;
932 if (!hmc) {
933 pr_warn("ibmvmc: read: no hmc\n");
934 return -EIO;
935 }
936
937 adapter = hmc->adapter;
938 if (!adapter) {
939 pr_warn("ibmvmc: read: no adapter\n");
940 return -EIO;
941 }
942
943 do {
944 prepare_to_wait(&ibmvmc_read_wait, &wait, TASK_INTERRUPTIBLE);
945
946 spin_lock_irqsave(&hmc->lock, flags);
947 if (hmc->queue_tail != hmc->queue_head)
948 /* Data is available */
949 break;
950
951 spin_unlock_irqrestore(&hmc->lock, flags);
952
953 if (!session->valid) {
954 retval = -EBADFD;
955 goto out;
956 }
957 if (file->f_flags & O_NONBLOCK) {
958 retval = -EAGAIN;
959 goto out;
960 }
961
962 schedule();
963
964 if (signal_pending(current)) {
965 retval = -ERESTARTSYS;
966 goto out;
967 }
968 } while (1);
969
970 buffer = &(hmc->buffer[hmc->queue_outbound_msgs[hmc->queue_tail]]);
971 hmc->queue_tail++;
972 if (hmc->queue_tail == ibmvmc_max_buf_pool_size)
973 hmc->queue_tail = 0;
974 spin_unlock_irqrestore(&hmc->lock, flags);
975
976 nbytes = min_t(size_t, nbytes, buffer->msg_len);
977 n = copy_to_user((void *)buf, buffer->real_addr_local, nbytes);
978 dev_dbg(adapter->dev, "read: copy to user nbytes = 0x%lx.\n", nbytes);
979 ibmvmc_free_hmc_buffer(hmc, buffer);
980 retval = nbytes;
981
982 if (n) {
983 dev_warn(adapter->dev, "read: copy to user failed.\n");
984 retval = -EFAULT;
985 }
986
987 out:
988 finish_wait(&ibmvmc_read_wait, &wait);
989 dev_dbg(adapter->dev, "read: out %ld\n", retval);
990 return retval;
991}
992
993/**
994 * ibmvmc_poll - Poll
995 *
996 * @file: file struct
997 * @wait: Poll Table
998 *
999 * Return:
1000 * poll.h return values
1001 */
1002static unsigned int ibmvmc_poll(struct file *file, poll_table *wait)
1003{
1004 struct ibmvmc_file_session *session;
1005 struct ibmvmc_hmc *hmc;
1006 unsigned int mask = 0;
1007
1008 session = file->private_data;
1009 if (!session)
1010 return 0;
1011
1012 hmc = session->hmc;
1013 if (!hmc)
1014 return 0;
1015
1016 poll_wait(file, &ibmvmc_read_wait, wait);
1017
1018 if (hmc->queue_head != hmc->queue_tail)
1019 mask |= POLLIN | POLLRDNORM;
1020
1021 return mask;
1022}
1023
1024/**
1025 * ibmvmc_write - Write
1026 *
1027 * @file: file struct
1028 * @buf: Character buffer
1029 * @count: Count field
1030 * @ppos: Offset
1031 *
1032 * Return:
1033 * 0 - Success
1034 * Non-zero - Failure
1035 */
1036static ssize_t ibmvmc_write(struct file *file, const char *buffer,
1037 size_t count, loff_t *ppos)
1038{
1039 struct ibmvmc_buffer *vmc_buffer;
1040 struct ibmvmc_file_session *session;
1041 struct crq_server_adapter *adapter;
1042 struct ibmvmc_hmc *hmc;
1043 unsigned char *buf;
1044 unsigned long flags;
1045 size_t bytes;
1046 const char *p = buffer;
1047 size_t c = count;
1048 int ret = 0;
1049
1050 session = file->private_data;
1051 if (!session)
1052 return -EIO;
1053
1054 hmc = session->hmc;
1055 if (!hmc)
1056 return -EIO;
1057
1058 spin_lock_irqsave(&hmc->lock, flags);
1059 if (hmc->state == ibmhmc_state_free) {
1060 /* HMC connection is not valid (possibly was reset under us). */
1061 ret = -EIO;
1062 goto out;
1063 }
1064
1065 adapter = hmc->adapter;
1066 if (!adapter) {
1067 ret = -EIO;
1068 goto out;
1069 }
1070
1071 if (count > ibmvmc.max_mtu) {
1072 dev_warn(adapter->dev, "invalid buffer size 0x%lx\n",
1073 (unsigned long)count);
1074 ret = -EIO;
1075 goto out;
1076 }
1077
1078 /* Waiting for the open resp message to the ioctl(1) - retry */
1079 if (hmc->state == ibmhmc_state_opening) {
1080 ret = -EBUSY;
1081 goto out;
1082 }
1083
1084 /* Make sure the ioctl() was called & the open msg sent, and that
1085 * the HMC connection has not failed.
1086 */
1087 if (hmc->state != ibmhmc_state_ready) {
1088 ret = -EIO;
1089 goto out;
1090 }
1091
1092 vmc_buffer = ibmvmc_get_valid_hmc_buffer(hmc->index);
1093 if (!vmc_buffer) {
1094 /* No buffer available for the msg send, or we have not yet
1095 * completed the open/open_resp sequence. Retry until this is
1096 * complete.
1097 */
1098 ret = -EBUSY;
1099 goto out;
1100 }
1101 if (!vmc_buffer->real_addr_local) {
1102 dev_err(adapter->dev, "no buffer storage assigned\n");
1103 ret = -EIO;
1104 goto out;
1105 }
1106 buf = vmc_buffer->real_addr_local;
1107
1108 while (c > 0) {
1109 bytes = min_t(size_t, c, vmc_buffer->size);
1110
1111 bytes -= copy_from_user(buf, p, bytes);
1112 if (!bytes) {
1113 ret = -EFAULT;
1114 goto out;
1115 }
1116 c -= bytes;
1117 p += bytes;
1118 }
1119 if (p == buffer)
1120 goto out;
1121
1122 file->f_path.dentry->d_inode->i_mtime = current_time(file_inode(file));
1123 mark_inode_dirty(file->f_path.dentry->d_inode);
1124
1125 dev_dbg(adapter->dev, "write: file = 0x%lx, count = 0x%lx\n",
1126 (unsigned long)file, (unsigned long)count);
1127
1128 ibmvmc_send_msg(adapter, vmc_buffer, hmc, count);
1129 ret = p - buffer;
1130 out:
1131 spin_unlock_irqrestore(&hmc->lock, flags);
1132 return (ssize_t)(ret);
1133}
1134
1135/**
1136 * ibmvmc_setup_hmc - Setup the HMC
1137 *
1138 * @session: ibmvmc_file_session struct
1139 *
1140 * Return:
1141 * 0 - Success
1142 * Non-zero - Failure
1143 */
1144static long ibmvmc_setup_hmc(struct ibmvmc_file_session *session)
1145{
1146 struct ibmvmc_hmc *hmc;
1147 unsigned int valid, free, index;
1148
1149 if (ibmvmc.state == ibmvmc_state_failed) {
1150 pr_warn("ibmvmc: Reserve HMC: state_failed\n");
1151 return -EIO;
1152 }
1153
1154 if (ibmvmc.state < ibmvmc_state_ready) {
1155 pr_warn("ibmvmc: Reserve HMC: not state_ready\n");
1156 return -EAGAIN;
1157 }
1158
1159 /* Device is busy until capabilities have been exchanged and we
1160 * have a generic buffer for each possible HMC connection.
1161 */
1162 for (index = 0; index <= ibmvmc.max_hmc_index; index++) {
1163 valid = 0;
1164 ibmvmc_count_hmc_buffers(index, &valid, &free);
1165 if (valid == 0) {
1166 pr_warn("ibmvmc: buffers not ready for index %d\n",
1167 index);
1168 return -ENOBUFS;
1169 }
1170 }
1171
1172 /* Get an hmc object, and transition to ibmhmc_state_initial */
1173 hmc = ibmvmc_get_free_hmc();
1174 if (!hmc) {
1175 pr_warn("%s: free hmc not found\n", __func__);
1176 return -EBUSY;
1177 }
1178
1179 hmc->session = hmc->session + 1;
1180 if (hmc->session == 0xff)
1181 hmc->session = 1;
1182
1183 session->hmc = hmc;
1184 hmc->adapter = &ibmvmc_adapter;
1185 hmc->file_session = session;
1186 session->valid = 1;
1187
1188 return 0;
1189}
1190
1191/**
1192 * ibmvmc_ioctl_sethmcid - IOCTL Set HMC ID
1193 *
1194 * @session: ibmvmc_file_session struct
1195 * @new_hmc_id: HMC id field
1196 *
1197 * IOCTL command to setup the hmc id
1198 *
1199 * Return:
1200 * 0 - Success
1201 * Non-zero - Failure
1202 */
1203static long ibmvmc_ioctl_sethmcid(struct ibmvmc_file_session *session,
1204 unsigned char __user *new_hmc_id)
1205{
1206 struct ibmvmc_hmc *hmc;
1207 struct ibmvmc_buffer *buffer;
1208 size_t bytes;
1209 char print_buffer[HMC_ID_LEN + 1];
1210 unsigned long flags;
1211 long rc = 0;
1212
1213 /* Reserve HMC session */
1214 hmc = session->hmc;
1215 if (!hmc) {
1216 rc = ibmvmc_setup_hmc(session);
1217 if (rc)
1218 return rc;
1219
1220 hmc = session->hmc;
1221 if (!hmc) {
1222 pr_err("ibmvmc: setup_hmc success but no hmc\n");
1223 return -EIO;
1224 }
1225 }
1226
1227 if (hmc->state != ibmhmc_state_initial) {
1228 pr_warn("ibmvmc: sethmcid: invalid state to send open 0x%x\n",
1229 hmc->state);
1230 return -EIO;
1231 }
1232
1233 bytes = copy_from_user(hmc->hmc_id, new_hmc_id, HMC_ID_LEN);
1234 if (bytes)
1235 return -EFAULT;
1236
1237 /* Send Open Session command */
1238 spin_lock_irqsave(&hmc->lock, flags);
1239 buffer = ibmvmc_get_valid_hmc_buffer(hmc->index);
1240 spin_unlock_irqrestore(&hmc->lock, flags);
1241
1242 if (!buffer || !buffer->real_addr_local) {
1243 pr_warn("ibmvmc: sethmcid: no buffer available\n");
1244 return -EIO;
1245 }
1246
1247 /* Make sure buffer is NULL terminated before trying to print it */
1248 memset(print_buffer, 0, HMC_ID_LEN + 1);
1249 strncpy(print_buffer, hmc->hmc_id, HMC_ID_LEN);
1250 pr_info("ibmvmc: sethmcid: Set HMC ID: \"%s\"\n", print_buffer);
1251
1252 memcpy(buffer->real_addr_local, hmc->hmc_id, HMC_ID_LEN);
1253 /* RDMA over ID, send open msg, change state to ibmhmc_state_opening */
1254 rc = ibmvmc_send_open(buffer, hmc);
1255
1256 return rc;
1257}
1258
1259/**
1260 * ibmvmc_ioctl_query - IOCTL Query
1261 *
1262 * @session: ibmvmc_file_session struct
1263 * @ret_struct: ibmvmc_query_struct
1264 *
1265 * Return:
1266 * 0 - Success
1267 * Non-zero - Failure
1268 */
1269static long ibmvmc_ioctl_query(struct ibmvmc_file_session *session,
1270 struct ibmvmc_query_struct __user *ret_struct)
1271{
1272 struct ibmvmc_query_struct query_struct;
1273 size_t bytes;
1274
1275 memset(&query_struct, 0, sizeof(query_struct));
1276 query_struct.have_vmc = (ibmvmc.state > ibmvmc_state_initial);
1277 query_struct.state = ibmvmc.state;
1278 query_struct.vmc_drc_index = ibmvmc.vmc_drc_index;
1279
1280 bytes = copy_to_user(ret_struct, &query_struct,
1281 sizeof(query_struct));
1282 if (bytes)
1283 return -EFAULT;
1284
1285 return 0;
1286}
1287
1288/**
1289 * ibmvmc_ioctl_requestvmc - IOCTL Request VMC
1290 *
1291 * @session: ibmvmc_file_session struct
1292 * @ret_vmc_index: VMC Index
1293 *
1294 * Return:
1295 * 0 - Success
1296 * Non-zero - Failure
1297 */
1298static long ibmvmc_ioctl_requestvmc(struct ibmvmc_file_session *session,
1299 u32 __user *ret_vmc_index)
1300{
1301 /* TODO: (adreznec) Add locking to control multiple process access */
1302 size_t bytes;
1303 long rc;
1304 u32 vmc_drc_index;
1305
1306 /* Call to request the VMC device from phyp*/
1307 rc = h_request_vmc(&vmc_drc_index);
1308 pr_debug("ibmvmc: requestvmc: H_REQUEST_VMC rc = 0x%lx\n", rc);
1309
1310 if (rc == H_SUCCESS) {
1311 rc = 0;
1312 } else if (rc == H_FUNCTION) {
1313 pr_err("ibmvmc: requestvmc: h_request_vmc not supported\n");
1314 return -EPERM;
1315 } else if (rc == H_AUTHORITY) {
1316 pr_err("ibmvmc: requestvmc: hypervisor denied vmc request\n");
1317 return -EPERM;
1318 } else if (rc == H_HARDWARE) {
1319 pr_err("ibmvmc: requestvmc: hypervisor hardware fault\n");
1320 return -EIO;
1321 } else if (rc == H_RESOURCE) {
1322 pr_err("ibmvmc: requestvmc: vmc resource unavailable\n");
1323 return -ENODEV;
1324 } else if (rc == H_NOT_AVAILABLE) {
1325 pr_err("ibmvmc: requestvmc: system cannot be vmc managed\n");
1326 return -EPERM;
1327 } else if (rc == H_PARAMETER) {
1328 pr_err("ibmvmc: requestvmc: invalid parameter\n");
1329 return -EINVAL;
1330 }
1331
1332 /* Success, set the vmc index in global struct */
1333 ibmvmc.vmc_drc_index = vmc_drc_index;
1334
1335 bytes = copy_to_user(ret_vmc_index, &vmc_drc_index,
1336 sizeof(*ret_vmc_index));
1337 if (bytes) {
1338 pr_warn("ibmvmc: requestvmc: copy to user failed.\n");
1339 return -EFAULT;
1340 }
1341 return rc;
1342}
1343
1344/**
1345 * ibmvmc_ioctl - IOCTL
1346 *
1347 * @session: ibmvmc_file_session struct
1348 * @cmd: cmd field
1349 * @arg: Argument field
1350 *
1351 * Return:
1352 * 0 - Success
1353 * Non-zero - Failure
1354 */
1355static long ibmvmc_ioctl(struct file *file,
1356 unsigned int cmd, unsigned long arg)
1357{
1358 struct ibmvmc_file_session *session = file->private_data;
1359
1360 pr_debug("ibmvmc: ioctl file=0x%lx, cmd=0x%x, arg=0x%lx, ses=0x%lx\n",
1361 (unsigned long)file, cmd, arg,
1362 (unsigned long)session);
1363
1364 if (!session) {
1365 pr_warn("ibmvmc: ioctl: no session\n");
1366 return -EIO;
1367 }
1368
1369 switch (cmd) {
1370 case VMC_IOCTL_SETHMCID:
1371 return ibmvmc_ioctl_sethmcid(session,
1372 (unsigned char __user *)arg);
1373 case VMC_IOCTL_QUERY:
1374 return ibmvmc_ioctl_query(session,
1375 (struct ibmvmc_query_struct __user *)arg);
1376 case VMC_IOCTL_REQUESTVMC:
1377 return ibmvmc_ioctl_requestvmc(session,
1378 (unsigned int __user *)arg);
1379 default:
1380 pr_warn("ibmvmc: unknown ioctl 0x%x\n", cmd);
1381 return -EINVAL;
1382 }
1383}
1384
1385static const struct file_operations ibmvmc_fops = {
1386 .owner = THIS_MODULE,
1387 .read = ibmvmc_read,
1388 .write = ibmvmc_write,
1389 .poll = ibmvmc_poll,
1390 .unlocked_ioctl = ibmvmc_ioctl,
1391 .open = ibmvmc_open,
1392 .release = ibmvmc_close,
1393};
1394
1395/**
1396 * ibmvmc_add_buffer - Add Buffer
1397 *
1398 * @adapter: crq_server_adapter struct
1399 * @crq: ibmvmc_crq_msg struct
1400 *
1401 * This message transfers a buffer from hypervisor ownership to management
1402 * partition ownership. The LIOBA is obtained from the virtual TCE table
1403 * associated with the hypervisor side of the VMC device, and points to a
1404 * buffer of size MTU (as established in the capabilities exchange).
1405 *
1406 * Typical flow for ading buffers:
1407 * 1. A new management application connection is opened by the management
1408 * partition.
1409 * 2. The hypervisor assigns new buffers for the traffic associated with
1410 * that connection.
1411 * 3. The hypervisor sends VMC Add Buffer messages to the management
1412 * partition, informing it of the new buffers.
1413 * 4. The hypervisor sends an HMC protocol message (to the management
1414 * application) notifying it of the new buffers. This informs the
1415 * application that it has buffers available for sending HMC
1416 * commands.
1417 *
1418 * Return:
1419 * 0 - Success
1420 * Non-zero - Failure
1421 */
1422static int ibmvmc_add_buffer(struct crq_server_adapter *adapter,
1423 struct ibmvmc_crq_msg *crq)
1424{
1425 struct ibmvmc_buffer *buffer;
1426 u8 hmc_index;
1427 u8 hmc_session;
1428 u16 buffer_id;
1429 unsigned long flags;
1430 int rc = 0;
1431
1432 if (!crq)
1433 return -1;
1434
1435 hmc_session = crq->hmc_session;
1436 hmc_index = crq->hmc_index;
1437 buffer_id = be16_to_cpu(crq->var2.buffer_id);
1438
1439 if (hmc_index > ibmvmc.max_hmc_index) {
1440 dev_err(adapter->dev, "add_buffer: invalid hmc_index = 0x%x\n",
1441 hmc_index);
1442 ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_HMC_INDEX,
1443 hmc_session, hmc_index, buffer_id);
1444 return -1;
1445 }
1446
1447 if (buffer_id >= ibmvmc.max_buffer_pool_size) {
1448 dev_err(adapter->dev, "add_buffer: invalid buffer_id = 0x%x\n",
1449 buffer_id);
1450 ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_BUFFER_ID,
1451 hmc_session, hmc_index, buffer_id);
1452 return -1;
1453 }
1454
1455 spin_lock_irqsave(&hmcs[hmc_index].lock, flags);
1456 buffer = &hmcs[hmc_index].buffer[buffer_id];
1457
1458 if (buffer->real_addr_local || buffer->dma_addr_local) {
1459 dev_warn(adapter->dev, "add_buffer: already allocated id = 0x%lx\n",
1460 (unsigned long)buffer_id);
1461 spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags);
1462 ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_BUFFER_ID,
1463 hmc_session, hmc_index, buffer_id);
1464 return -1;
1465 }
1466
1467 buffer->real_addr_local = alloc_dma_buffer(to_vio_dev(adapter->dev),
1468 ibmvmc.max_mtu,
1469 &buffer->dma_addr_local);
1470
1471 if (!buffer->real_addr_local) {
1472 dev_err(adapter->dev, "add_buffer: alloc_dma_buffer failed.\n");
1473 spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags);
1474 ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INTERFACE_FAILURE,
1475 hmc_session, hmc_index, buffer_id);
1476 return -1;
1477 }
1478
1479 buffer->dma_addr_remote = be32_to_cpu(crq->var3.lioba);
1480 buffer->size = ibmvmc.max_mtu;
1481 buffer->owner = crq->var1.owner;
1482 buffer->free = 1;
1483 /* Must ensure valid==1 is observable only after all other fields are */
1484 dma_wmb();
1485 buffer->valid = 1;
1486 buffer->id = buffer_id;
1487
1488 dev_dbg(adapter->dev, "add_buffer: successfully added a buffer:\n");
1489 dev_dbg(adapter->dev, " index: %d, session: %d, buffer: 0x%x, owner: %d\n",
1490 hmc_index, hmc_session, buffer_id, buffer->owner);
1491 dev_dbg(adapter->dev, " local: 0x%x, remote: 0x%x\n",
1492 (u32)buffer->dma_addr_local,
1493 (u32)buffer->dma_addr_remote);
1494 spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags);
1495
1496 ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_SUCCESS, hmc_session,
1497 hmc_index, buffer_id);
1498
1499 return rc;
1500}
1501
1502/**
1503 * ibmvmc_rem_buffer - Remove Buffer
1504 *
1505 * @adapter: crq_server_adapter struct
1506 * @crq: ibmvmc_crq_msg struct
1507 *
1508 * This message requests an HMC buffer to be transferred from management
1509 * partition ownership to hypervisor ownership. The management partition may
1510 * not be able to satisfy the request at a particular point in time if all its
1511 * buffers are in use. The management partition requires a depth of at least
1512 * one inbound buffer to allow management application commands to flow to the
1513 * hypervisor. It is, therefore, an interface error for the hypervisor to
1514 * attempt to remove the management partition's last buffer.
1515 *
1516 * The hypervisor is expected to manage buffer usage with the management
1517 * application directly and inform the management partition when buffers may be
1518 * removed. The typical flow for removing buffers:
1519 *
1520 * 1. The management application no longer needs a communication path to a
1521 * particular hypervisor function. That function is closed.
1522 * 2. The hypervisor and the management application quiesce all traffic to that
1523 * function. The hypervisor requests a reduction in buffer pool size.
1524 * 3. The management application acknowledges the reduction in buffer pool size.
1525 * 4. The hypervisor sends a Remove Buffer message to the management partition,
1526 * informing it of the reduction in buffers.
1527 * 5. The management partition verifies it can remove the buffer. This is
1528 * possible if buffers have been quiesced.
1529 *
1530 * Return:
1531 * 0 - Success
1532 * Non-zero - Failure
1533 */
1534/*
1535 * The hypervisor requested that we pick an unused buffer, and return it.
1536 * Before sending the buffer back, we free any storage associated with the
1537 * buffer.
1538 */
1539static int ibmvmc_rem_buffer(struct crq_server_adapter *adapter,
1540 struct ibmvmc_crq_msg *crq)
1541{
1542 struct ibmvmc_buffer *buffer;
1543 u8 hmc_index;
1544 u8 hmc_session;
1545 u16 buffer_id = 0;
1546 unsigned long flags;
1547 int rc = 0;
1548
1549 if (!crq)
1550 return -1;
1551
1552 hmc_session = crq->hmc_session;
1553 hmc_index = crq->hmc_index;
1554
1555 if (hmc_index > ibmvmc.max_hmc_index) {
1556 dev_warn(adapter->dev, "rem_buffer: invalid hmc_index = 0x%x\n",
1557 hmc_index);
1558 ibmvmc_send_rem_buffer_resp(adapter, VMC_MSG_INVALID_HMC_INDEX,
1559 hmc_session, hmc_index, buffer_id);
1560 return -1;
1561 }
1562
1563 spin_lock_irqsave(&hmcs[hmc_index].lock, flags);
1564 buffer = ibmvmc_get_free_hmc_buffer(adapter, hmc_index);
1565 if (!buffer) {
1566 dev_info(adapter->dev, "rem_buffer: no buffer to remove\n");
1567 spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags);
1568 ibmvmc_send_rem_buffer_resp(adapter, VMC_MSG_NO_BUFFER,
1569 hmc_session, hmc_index,
1570 VMC_INVALID_BUFFER_ID);
1571 return -1;
1572 }
1573
1574 buffer_id = buffer->id;
1575
1576 if (buffer->valid)
1577 free_dma_buffer(to_vio_dev(adapter->dev),
1578 ibmvmc.max_mtu,
1579 buffer->real_addr_local,
1580 buffer->dma_addr_local);
1581
1582 memset(buffer, 0, sizeof(struct ibmvmc_buffer));
1583 spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags);
1584
1585 dev_dbg(adapter->dev, "rem_buffer: removed buffer 0x%x.\n", buffer_id);
1586 ibmvmc_send_rem_buffer_resp(adapter, VMC_MSG_SUCCESS, hmc_session,
1587 hmc_index, buffer_id);
1588
1589 return rc;
1590}
1591
1592static int ibmvmc_recv_msg(struct crq_server_adapter *adapter,
1593 struct ibmvmc_crq_msg *crq)
1594{
1595 struct ibmvmc_buffer *buffer;
1596 struct ibmvmc_hmc *hmc;
1597 unsigned long msg_len;
1598 u8 hmc_index;
1599 u8 hmc_session;
1600 u16 buffer_id;
1601 unsigned long flags;
1602 int rc = 0;
1603
1604 if (!crq)
1605 return -1;
1606
1607 /* Hypervisor writes CRQs directly into our memory in big endian */
1608 dev_dbg(adapter->dev, "Recv_msg: msg from HV 0x%016llx 0x%016llx\n",
1609 be64_to_cpu(*((unsigned long *)crq)),
1610 be64_to_cpu(*(((unsigned long *)crq) + 1)));
1611
1612 hmc_session = crq->hmc_session;
1613 hmc_index = crq->hmc_index;
1614 buffer_id = be16_to_cpu(crq->var2.buffer_id);
1615 msg_len = be32_to_cpu(crq->var3.msg_len);
1616
1617 if (hmc_index > ibmvmc.max_hmc_index) {
1618 dev_err(adapter->dev, "Recv_msg: invalid hmc_index = 0x%x\n",
1619 hmc_index);
1620 ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_HMC_INDEX,
1621 hmc_session, hmc_index, buffer_id);
1622 return -1;
1623 }
1624
1625 if (buffer_id >= ibmvmc.max_buffer_pool_size) {
1626 dev_err(adapter->dev, "Recv_msg: invalid buffer_id = 0x%x\n",
1627 buffer_id);
1628 ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_BUFFER_ID,
1629 hmc_session, hmc_index, buffer_id);
1630 return -1;
1631 }
1632
1633 hmc = &hmcs[hmc_index];
1634 spin_lock_irqsave(&hmc->lock, flags);
1635
1636 if (hmc->state == ibmhmc_state_free) {
1637 dev_err(adapter->dev, "Recv_msg: invalid hmc state = 0x%x\n",
1638 hmc->state);
1639 /* HMC connection is not valid (possibly was reset under us). */
1640 spin_unlock_irqrestore(&hmc->lock, flags);
1641 return -1;
1642 }
1643
1644 buffer = &hmc->buffer[buffer_id];
1645
1646 if (buffer->valid == 0 || buffer->owner == VMC_BUF_OWNER_ALPHA) {
1647 dev_err(adapter->dev, "Recv_msg: not valid, or not HV. 0x%x 0x%x\n",
1648 buffer->valid, buffer->owner);
1649 spin_unlock_irqrestore(&hmc->lock, flags);
1650 return -1;
1651 }
1652
1653 /* RDMA the data into the partition. */
1654 rc = h_copy_rdma(msg_len,
1655 adapter->riobn,
1656 buffer->dma_addr_remote,
1657 adapter->liobn,
1658 buffer->dma_addr_local);
1659
1660 dev_dbg(adapter->dev, "Recv_msg: msg_len = 0x%x, buffer_id = 0x%x, queue_head = 0x%x, hmc_idx = 0x%x\n",
1661 (unsigned int)msg_len, (unsigned int)buffer_id,
1662 (unsigned int)hmc->queue_head, (unsigned int)hmc_index);
1663 buffer->msg_len = msg_len;
1664 buffer->free = 0;
1665 buffer->owner = VMC_BUF_OWNER_ALPHA;
1666
1667 if (rc) {
1668 dev_err(adapter->dev, "Failure in recv_msg: h_copy_rdma = 0x%x\n",
1669 rc);
1670 spin_unlock_irqrestore(&hmc->lock, flags);
1671 return -1;
1672 }
1673
1674 /* Must be locked because read operates on the same data */
1675 hmc->queue_outbound_msgs[hmc->queue_head] = buffer_id;
1676 hmc->queue_head++;
1677 if (hmc->queue_head == ibmvmc_max_buf_pool_size)
1678 hmc->queue_head = 0;
1679
1680 if (hmc->queue_head == hmc->queue_tail)
1681 dev_err(adapter->dev, "outbound buffer queue wrapped.\n");
1682
1683 spin_unlock_irqrestore(&hmc->lock, flags);
1684
1685 wake_up_interruptible(&ibmvmc_read_wait);
1686
1687 return 0;
1688}
1689
1690/**
1691 * ibmvmc_process_capabilities - Process Capabilities
1692 *
1693 * @adapter: crq_server_adapter struct
1694 * @crqp: ibmvmc_crq_msg struct
1695 *
1696 */
1697static void ibmvmc_process_capabilities(struct crq_server_adapter *adapter,
1698 struct ibmvmc_crq_msg *crqp)
1699{
1700 struct ibmvmc_admin_crq_msg *crq = (struct ibmvmc_admin_crq_msg *)crqp;
1701
1702 if ((be16_to_cpu(crq->version) >> 8) !=
1703 (IBMVMC_PROTOCOL_VERSION >> 8)) {
1704 dev_err(adapter->dev, "init failed, incompatible versions 0x%x 0x%x\n",
1705 be16_to_cpu(crq->version),
1706 IBMVMC_PROTOCOL_VERSION);
1707 ibmvmc.state = ibmvmc_state_failed;
1708 return;
1709 }
1710
1711 ibmvmc.max_mtu = min_t(u32, ibmvmc_max_mtu, be32_to_cpu(crq->max_mtu));
1712 ibmvmc.max_buffer_pool_size = min_t(u16, ibmvmc_max_buf_pool_size,
1713 be16_to_cpu(crq->pool_size));
1714 ibmvmc.max_hmc_index = min_t(u8, ibmvmc_max_hmcs, crq->max_hmc) - 1;
1715 ibmvmc.state = ibmvmc_state_ready;
1716
1717 dev_info(adapter->dev, "Capabilities: mtu=0x%x, pool_size=0x%x, max_hmc=0x%x\n",
1718 ibmvmc.max_mtu, ibmvmc.max_buffer_pool_size,
1719 ibmvmc.max_hmc_index);
1720}
1721
1722/**
1723 * ibmvmc_validate_hmc_session - Validate HMC Session
1724 *
1725 * @adapter: crq_server_adapter struct
1726 * @crq: ibmvmc_crq_msg struct
1727 *
1728 * Return:
1729 * 0 - Success
1730 * Non-zero - Failure
1731 */
1732static int ibmvmc_validate_hmc_session(struct crq_server_adapter *adapter,
1733 struct ibmvmc_crq_msg *crq)
1734{
1735 unsigned char hmc_index;
1736
1737 hmc_index = crq->hmc_index;
1738
1739 if (crq->hmc_session == 0)
1740 return 0;
1741
1742 if (hmc_index > ibmvmc.max_hmc_index)
1743 return -1;
1744
1745 if (hmcs[hmc_index].session != crq->hmc_session) {
1746 dev_warn(adapter->dev, "Drop, bad session: expected 0x%x, recv 0x%x\n",
1747 hmcs[hmc_index].session, crq->hmc_session);
1748 return -1;
1749 }
1750
1751 return 0;
1752}
1753
1754/**
1755 * ibmvmc_reset - Reset
1756 *
1757 * @adapter: crq_server_adapter struct
1758 * @xport_event: export_event field
1759 *
1760 * Closes all HMC sessions and conditionally schedules a CRQ reset.
1761 * @xport_event: If true, the partner closed their CRQ; we don't need to reset.
1762 * If false, we need to schedule a CRQ reset.
1763 */
1764static void ibmvmc_reset(struct crq_server_adapter *adapter, bool xport_event)
1765{
1766 int i;
1767
1768 if (ibmvmc.state != ibmvmc_state_sched_reset) {
1769 dev_info(adapter->dev, "*** Reset to initial state.\n");
1770 for (i = 0; i < ibmvmc_max_hmcs; i++)
1771 ibmvmc_return_hmc(&hmcs[i], xport_event);
1772
1773 if (xport_event) {
1774 /* CRQ was closed by the partner. We don't need to do
1775 * anything except set ourself to the correct state to
1776 * handle init msgs.
1777 */
1778 ibmvmc.state = ibmvmc_state_crqinit;
1779 } else {
1780 /* The partner did not close their CRQ - instead, we're
1781 * closing the CRQ on our end. Need to schedule this
1782 * for process context, because CRQ reset may require a
1783 * sleep.
1784 *
1785 * Setting ibmvmc.state here immediately prevents
1786 * ibmvmc_open from completing until the reset
1787 * completes in process context.
1788 */
1789 ibmvmc.state = ibmvmc_state_sched_reset;
1790 dev_dbg(adapter->dev, "Device reset scheduled");
1791 wake_up_interruptible(&adapter->reset_wait_queue);
1792 }
1793 }
1794}
1795
1796/**
1797 * ibmvmc_reset_task - Reset Task
1798 *
1799 * @data: Data field
1800 *
1801 * Performs a CRQ reset of the VMC device in process context.
1802 * NOTE: This function should not be called directly, use ibmvmc_reset.
1803 */
1804static int ibmvmc_reset_task(void *data)
1805{
1806 struct crq_server_adapter *adapter = data;
1807 int rc;
1808
1809 set_user_nice(current, -20);
1810
1811 while (!kthread_should_stop()) {
1812 wait_event_interruptible(adapter->reset_wait_queue,
1813 (ibmvmc.state == ibmvmc_state_sched_reset) ||
1814 kthread_should_stop());
1815
1816 if (kthread_should_stop())
1817 break;
1818
1819 dev_dbg(adapter->dev, "CRQ resetting in process context");
1820 tasklet_disable(&adapter->work_task);
1821
1822 rc = ibmvmc_reset_crq_queue(adapter);
1823
1824 if (rc != H_SUCCESS && rc != H_RESOURCE) {
1825 dev_err(adapter->dev, "Error initializing CRQ. rc = 0x%x\n",
1826 rc);
1827 ibmvmc.state = ibmvmc_state_failed;
1828 } else {
1829 ibmvmc.state = ibmvmc_state_crqinit;
1830
1831 if (ibmvmc_send_crq(adapter, 0xC001000000000000LL, 0)
1832 != 0 && rc != H_RESOURCE)
1833 dev_warn(adapter->dev, "Failed to send initialize CRQ message\n");
1834 }
1835
1836 vio_enable_interrupts(to_vio_dev(adapter->dev));
1837 tasklet_enable(&adapter->work_task);
1838 }
1839
1840 return 0;
1841}
1842
1843/**
1844 * ibmvmc_process_open_resp - Process Open Response
1845 *
1846 * @crq: ibmvmc_crq_msg struct
1847 * @adapter: crq_server_adapter struct
1848 *
1849 * This command is sent by the hypervisor in response to the Interface
1850 * Open message. When this message is received, the indicated buffer is
1851 * again available for management partition use.
1852 */
1853static void ibmvmc_process_open_resp(struct ibmvmc_crq_msg *crq,
1854 struct crq_server_adapter *adapter)
1855{
1856 unsigned char hmc_index;
1857 unsigned short buffer_id;
1858
1859 hmc_index = crq->hmc_index;
1860 if (hmc_index > ibmvmc.max_hmc_index) {
1861 /* Why would PHYP give an index > max negotiated? */
1862 ibmvmc_reset(adapter, false);
1863 return;
1864 }
1865
1866 if (crq->status) {
1867 dev_warn(adapter->dev, "open_resp: failed - status 0x%x\n",
1868 crq->status);
1869 ibmvmc_return_hmc(&hmcs[hmc_index], false);
1870 return;
1871 }
1872
1873 if (hmcs[hmc_index].state == ibmhmc_state_opening) {
1874 buffer_id = be16_to_cpu(crq->var2.buffer_id);
1875 if (buffer_id >= ibmvmc.max_buffer_pool_size) {
1876 dev_err(adapter->dev, "open_resp: invalid buffer_id = 0x%x\n",
1877 buffer_id);
1878 hmcs[hmc_index].state = ibmhmc_state_failed;
1879 } else {
1880 ibmvmc_free_hmc_buffer(&hmcs[hmc_index],
1881 &hmcs[hmc_index].buffer[buffer_id]);
1882 hmcs[hmc_index].state = ibmhmc_state_ready;
1883 dev_dbg(adapter->dev, "open_resp: set hmc state = ready\n");
1884 }
1885 } else {
1886 dev_warn(adapter->dev, "open_resp: invalid hmc state (0x%x)\n",
1887 hmcs[hmc_index].state);
1888 }
1889}
1890
1891/**
1892 * ibmvmc_process_close_resp - Process Close Response
1893 *
1894 * @crq: ibmvmc_crq_msg struct
1895 * @adapter: crq_server_adapter struct
1896 *
1897 * This command is sent by the hypervisor in response to the managemant
1898 * application Interface Close message.
1899 *
1900 * If the close fails, simply reset the entire driver as the state of the VMC
1901 * must be in tough shape.
1902 */
1903static void ibmvmc_process_close_resp(struct ibmvmc_crq_msg *crq,
1904 struct crq_server_adapter *adapter)
1905{
1906 unsigned char hmc_index;
1907
1908 hmc_index = crq->hmc_index;
1909 if (hmc_index > ibmvmc.max_hmc_index) {
1910 ibmvmc_reset(adapter, false);
1911 return;
1912 }
1913
1914 if (crq->status) {
1915 dev_warn(adapter->dev, "close_resp: failed - status 0x%x\n",
1916 crq->status);
1917 ibmvmc_reset(adapter, false);
1918 return;
1919 }
1920
1921 ibmvmc_return_hmc(&hmcs[hmc_index], false);
1922}
1923
1924/**
1925 * ibmvmc_crq_process - Process CRQ
1926 *
1927 * @adapter: crq_server_adapter struct
1928 * @crq: ibmvmc_crq_msg struct
1929 *
1930 * Process the CRQ message based upon the type of message received.
1931 *
1932 */
1933static void ibmvmc_crq_process(struct crq_server_adapter *adapter,
1934 struct ibmvmc_crq_msg *crq)
1935{
1936 switch (crq->type) {
1937 case VMC_MSG_CAP_RESP:
1938 dev_dbg(adapter->dev, "CRQ recv: capabilities resp (0x%x)\n",
1939 crq->type);
1940 if (ibmvmc.state == ibmvmc_state_capabilities)
1941 ibmvmc_process_capabilities(adapter, crq);
1942 else
1943 dev_warn(adapter->dev, "caps msg invalid in state 0x%x\n",
1944 ibmvmc.state);
1945 break;
1946 case VMC_MSG_OPEN_RESP:
1947 dev_dbg(adapter->dev, "CRQ recv: open resp (0x%x)\n",
1948 crq->type);
1949 if (ibmvmc_validate_hmc_session(adapter, crq) == 0)
1950 ibmvmc_process_open_resp(crq, adapter);
1951 break;
1952 case VMC_MSG_ADD_BUF:
1953 dev_dbg(adapter->dev, "CRQ recv: add buf (0x%x)\n",
1954 crq->type);
1955 if (ibmvmc_validate_hmc_session(adapter, crq) == 0)
1956 ibmvmc_add_buffer(adapter, crq);
1957 break;
1958 case VMC_MSG_REM_BUF:
1959 dev_dbg(adapter->dev, "CRQ recv: rem buf (0x%x)\n",
1960 crq->type);
1961 if (ibmvmc_validate_hmc_session(adapter, crq) == 0)
1962 ibmvmc_rem_buffer(adapter, crq);
1963 break;
1964 case VMC_MSG_SIGNAL:
1965 dev_dbg(adapter->dev, "CRQ recv: signal msg (0x%x)\n",
1966 crq->type);
1967 if (ibmvmc_validate_hmc_session(adapter, crq) == 0)
1968 ibmvmc_recv_msg(adapter, crq);
1969 break;
1970 case VMC_MSG_CLOSE_RESP:
1971 dev_dbg(adapter->dev, "CRQ recv: close resp (0x%x)\n",
1972 crq->type);
1973 if (ibmvmc_validate_hmc_session(adapter, crq) == 0)
1974 ibmvmc_process_close_resp(crq, adapter);
1975 break;
1976 case VMC_MSG_CAP:
1977 case VMC_MSG_OPEN:
1978 case VMC_MSG_CLOSE:
1979 case VMC_MSG_ADD_BUF_RESP:
1980 case VMC_MSG_REM_BUF_RESP:
1981 dev_warn(adapter->dev, "CRQ recv: unexpected msg (0x%x)\n",
1982 crq->type);
1983 break;
1984 default:
1985 dev_warn(adapter->dev, "CRQ recv: unknown msg (0x%x)\n",
1986 crq->type);
1987 break;
1988 }
1989}
1990
1991/**
1992 * ibmvmc_handle_crq_init - Handle CRQ Init
1993 *
1994 * @crq: ibmvmc_crq_msg struct
1995 * @adapter: crq_server_adapter struct
1996 *
1997 * Handle the type of crq initialization based on whether
1998 * it is a message or a response.
1999 *
2000 */
2001static void ibmvmc_handle_crq_init(struct ibmvmc_crq_msg *crq,
2002 struct crq_server_adapter *adapter)
2003{
2004 switch (crq->type) {
2005 case 0x01: /* Initialization message */
2006 dev_dbg(adapter->dev, "CRQ recv: CRQ init msg - state 0x%x\n",
2007 ibmvmc.state);
2008 if (ibmvmc.state == ibmvmc_state_crqinit) {
2009 /* Send back a response */
2010 if (ibmvmc_send_crq(adapter, 0xC002000000000000,
2011 0) == 0)
2012 ibmvmc_send_capabilities(adapter);
2013 else
2014 dev_err(adapter->dev, " Unable to send init rsp\n");
2015 } else {
2016 dev_err(adapter->dev, "Invalid state 0x%x mtu = 0x%x\n",
2017 ibmvmc.state, ibmvmc.max_mtu);
2018 }
2019
2020 break;
2021 case 0x02: /* Initialization response */
2022 dev_dbg(adapter->dev, "CRQ recv: initialization resp msg - state 0x%x\n",
2023 ibmvmc.state);
2024 if (ibmvmc.state == ibmvmc_state_crqinit)
2025 ibmvmc_send_capabilities(adapter);
2026 break;
2027 default:
2028 dev_warn(adapter->dev, "Unknown crq message type 0x%lx\n",
2029 (unsigned long)crq->type);
2030 }
2031}
2032
2033/**
2034 * ibmvmc_handle_crq - Handle CRQ
2035 *
2036 * @crq: ibmvmc_crq_msg struct
2037 * @adapter: crq_server_adapter struct
2038 *
2039 * Read the command elements from the command queue and execute the
2040 * requests based upon the type of crq message.
2041 *
2042 */
2043static void ibmvmc_handle_crq(struct ibmvmc_crq_msg *crq,
2044 struct crq_server_adapter *adapter)
2045{
2046 switch (crq->valid) {
2047 case 0xC0: /* initialization */
2048 ibmvmc_handle_crq_init(crq, adapter);
2049 break;
2050 case 0xFF: /* Hypervisor telling us the connection is closed */
2051 dev_warn(adapter->dev, "CRQ recv: virtual adapter failed - resetting.\n");
2052 ibmvmc_reset(adapter, true);
2053 break;
2054 case 0x80: /* real payload */
2055 ibmvmc_crq_process(adapter, crq);
2056 break;
2057 default:
2058 dev_warn(adapter->dev, "CRQ recv: unknown msg 0x%02x.\n",
2059 crq->valid);
2060 break;
2061 }
2062}
2063
2064static void ibmvmc_task(unsigned long data)
2065{
2066 struct crq_server_adapter *adapter =
2067 (struct crq_server_adapter *)data;
2068 struct vio_dev *vdev = to_vio_dev(adapter->dev);
2069 struct ibmvmc_crq_msg *crq;
2070 int done = 0;
2071
2072 while (!done) {
2073 /* Pull all the valid messages off the CRQ */
2074 while ((crq = crq_queue_next_crq(&adapter->queue)) != NULL) {
2075 ibmvmc_handle_crq(crq, adapter);
2076 crq->valid = 0x00;
2077 /* CRQ reset was requested, stop processing CRQs.
2078 * Interrupts will be re-enabled by the reset task.
2079 */
2080 if (ibmvmc.state == ibmvmc_state_sched_reset)
2081 return;
2082 }
2083
2084 vio_enable_interrupts(vdev);
2085 crq = crq_queue_next_crq(&adapter->queue);
2086 if (crq) {
2087 vio_disable_interrupts(vdev);
2088 ibmvmc_handle_crq(crq, adapter);
2089 crq->valid = 0x00;
2090 /* CRQ reset was requested, stop processing CRQs.
2091 * Interrupts will be re-enabled by the reset task.
2092 */
2093 if (ibmvmc.state == ibmvmc_state_sched_reset)
2094 return;
2095 } else {
2096 done = 1;
2097 }
2098 }
2099}
2100
2101/**
2102 * ibmvmc_init_crq_queue - Init CRQ Queue
2103 *
2104 * @adapter: crq_server_adapter struct
2105 *
2106 * Return:
2107 * 0 - Success
2108 * Non-zero - Failure
2109 */
2110static int ibmvmc_init_crq_queue(struct crq_server_adapter *adapter)
2111{
2112 struct vio_dev *vdev = to_vio_dev(adapter->dev);
2113 struct crq_queue *queue = &adapter->queue;
2114 int rc = 0;
2115 int retrc = 0;
2116
2117 queue->msgs = (struct ibmvmc_crq_msg *)get_zeroed_page(GFP_KERNEL);
2118
2119 if (!queue->msgs)
2120 goto malloc_failed;
2121
2122 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
2123
2124 queue->msg_token = dma_map_single(adapter->dev, queue->msgs,
2125 queue->size * sizeof(*queue->msgs),
2126 DMA_BIDIRECTIONAL);
2127
2128 if (dma_mapping_error(adapter->dev, queue->msg_token))
2129 goto map_failed;
2130
2131 retrc = plpar_hcall_norets(H_REG_CRQ,
2132 vdev->unit_address,
2133 queue->msg_token, PAGE_SIZE);
2134 retrc = rc;
2135
2136 if (rc == H_RESOURCE)
2137 rc = ibmvmc_reset_crq_queue(adapter);
2138
2139 if (rc == 2) {
2140 dev_warn(adapter->dev, "Partner adapter not ready\n");
2141 retrc = 0;
2142 } else if (rc != 0) {
2143 dev_err(adapter->dev, "Error %d opening adapter\n", rc);
2144 goto reg_crq_failed;
2145 }
2146
2147 queue->cur = 0;
2148 spin_lock_init(&queue->lock);
2149
2150 tasklet_init(&adapter->work_task, ibmvmc_task, (unsigned long)adapter);
2151
2152 if (request_irq(vdev->irq,
2153 ibmvmc_handle_event,
2154 0, "ibmvmc", (void *)adapter) != 0) {
2155 dev_err(adapter->dev, "couldn't register irq 0x%x\n",
2156 vdev->irq);
2157 goto req_irq_failed;
2158 }
2159
2160 rc = vio_enable_interrupts(vdev);
2161 if (rc != 0) {
2162 dev_err(adapter->dev, "Error %d enabling interrupts!!!\n", rc);
2163 goto req_irq_failed;
2164 }
2165
2166 return retrc;
2167
2168req_irq_failed:
2169 /* Cannot have any work since we either never got our IRQ registered,
2170 * or never got interrupts enabled
2171 */
2172 tasklet_kill(&adapter->work_task);
2173 h_free_crq(vdev->unit_address);
2174reg_crq_failed:
2175 dma_unmap_single(adapter->dev,
2176 queue->msg_token,
2177 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
2178map_failed:
2179 free_page((unsigned long)queue->msgs);
2180malloc_failed:
2181 return -ENOMEM;
2182}
2183
2184/* Fill in the liobn and riobn fields on the adapter */
2185static int read_dma_window(struct vio_dev *vdev,
2186 struct crq_server_adapter *adapter)
2187{
2188 const __be32 *dma_window;
2189 const __be32 *prop;
2190
2191 /* TODO Using of_parse_dma_window would be better, but it doesn't give
2192 * a way to read multiple windows without already knowing the size of
2193 * a window or the number of windows
2194 */
2195 dma_window =
2196 (const __be32 *)vio_get_attribute(vdev, "ibm,my-dma-window",
2197 NULL);
2198 if (!dma_window) {
2199 dev_warn(adapter->dev, "Couldn't find ibm,my-dma-window property\n");
2200 return -1;
2201 }
2202
2203 adapter->liobn = be32_to_cpu(*dma_window);
2204 dma_window++;
2205
2206 prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells",
2207 NULL);
2208 if (!prop) {
2209 dev_warn(adapter->dev, "Couldn't find ibm,#dma-address-cells property\n");
2210 dma_window++;
2211 } else {
2212 dma_window += be32_to_cpu(*prop);
2213 }
2214
2215 prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells",
2216 NULL);
2217 if (!prop) {
2218 dev_warn(adapter->dev, "Couldn't find ibm,#dma-size-cells property\n");
2219 dma_window++;
2220 } else {
2221 dma_window += be32_to_cpu(*prop);
2222 }
2223
2224 /* dma_window should point to the second window now */
2225 adapter->riobn = be32_to_cpu(*dma_window);
2226
2227 return 0;
2228}
2229
2230static int ibmvmc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2231{
2232 struct crq_server_adapter *adapter = &ibmvmc_adapter;
2233 int rc;
2234
2235 dev_set_drvdata(&vdev->dev, NULL);
2236 memset(adapter, 0, sizeof(*adapter));
2237 adapter->dev = &vdev->dev;
2238
2239 dev_info(adapter->dev, "Probe for UA 0x%x\n", vdev->unit_address);
2240
2241 rc = read_dma_window(vdev, adapter);
2242 if (rc != 0) {
2243 ibmvmc.state = ibmvmc_state_failed;
2244 return -1;
2245 }
2246
2247 dev_dbg(adapter->dev, "Probe: liobn 0x%x, riobn 0x%x\n",
2248 adapter->liobn, adapter->riobn);
2249
2250 init_waitqueue_head(&adapter->reset_wait_queue);
2251 adapter->reset_task = kthread_run(ibmvmc_reset_task, adapter, "ibmvmc");
2252 if (IS_ERR(adapter->reset_task)) {
2253 dev_err(adapter->dev, "Failed to start reset thread\n");
2254 ibmvmc.state = ibmvmc_state_failed;
2255 rc = PTR_ERR(adapter->reset_task);
2256 adapter->reset_task = NULL;
2257 return rc;
2258 }
2259
2260 rc = ibmvmc_init_crq_queue(adapter);
2261 if (rc != 0 && rc != H_RESOURCE) {
2262 dev_err(adapter->dev, "Error initializing CRQ. rc = 0x%x\n",
2263 rc);
2264 ibmvmc.state = ibmvmc_state_failed;
2265 goto crq_failed;
2266 }
2267
2268 ibmvmc.state = ibmvmc_state_crqinit;
2269
2270 /* Try to send an initialization message. Note that this is allowed
2271 * to fail if the other end is not acive. In that case we just wait
2272 * for the other side to initialize.
2273 */
2274 if (ibmvmc_send_crq(adapter, 0xC001000000000000LL, 0) != 0 &&
2275 rc != H_RESOURCE)
2276 dev_warn(adapter->dev, "Failed to send initialize CRQ message\n");
2277
2278 dev_set_drvdata(&vdev->dev, adapter);
2279
2280 return 0;
2281
2282crq_failed:
2283 kthread_stop(adapter->reset_task);
2284 adapter->reset_task = NULL;
2285 return -EPERM;
2286}
2287
2288static int ibmvmc_remove(struct vio_dev *vdev)
2289{
2290 struct crq_server_adapter *adapter = dev_get_drvdata(&vdev->dev);
2291
2292 dev_info(adapter->dev, "Entering remove for UA 0x%x\n",
2293 vdev->unit_address);
2294 ibmvmc_release_crq_queue(adapter);
2295
2296 return 0;
2297}
2298
2299static struct vio_device_id ibmvmc_device_table[] = {
2300 { "ibm,vmc", "IBM,vmc" },
2301 { "", "" }
2302};
2303MODULE_DEVICE_TABLE(vio, ibmvmc_device_table);
2304
2305static struct vio_driver ibmvmc_driver = {
2306 .name = ibmvmc_driver_name,
2307 .id_table = ibmvmc_device_table,
2308 .probe = ibmvmc_probe,
2309 .remove = ibmvmc_remove,
2310};
2311
2312static void __init ibmvmc_scrub_module_parms(void)
2313{
2314 if (ibmvmc_max_mtu > MAX_MTU) {
2315 pr_warn("ibmvmc: Max MTU reduced to %d\n", MAX_MTU);
2316 ibmvmc_max_mtu = MAX_MTU;
2317 } else if (ibmvmc_max_mtu < MIN_MTU) {
2318 pr_warn("ibmvmc: Max MTU increased to %d\n", MIN_MTU);
2319 ibmvmc_max_mtu = MIN_MTU;
2320 }
2321
2322 if (ibmvmc_max_buf_pool_size > MAX_BUF_POOL_SIZE) {
2323 pr_warn("ibmvmc: Max buffer pool size reduced to %d\n",
2324 MAX_BUF_POOL_SIZE);
2325 ibmvmc_max_buf_pool_size = MAX_BUF_POOL_SIZE;
2326 } else if (ibmvmc_max_buf_pool_size < MIN_BUF_POOL_SIZE) {
2327 pr_warn("ibmvmc: Max buffer pool size increased to %d\n",
2328 MIN_BUF_POOL_SIZE);
2329 ibmvmc_max_buf_pool_size = MIN_BUF_POOL_SIZE;
2330 }
2331
2332 if (ibmvmc_max_hmcs > MAX_HMCS) {
2333 pr_warn("ibmvmc: Max HMCs reduced to %d\n", MAX_HMCS);
2334 ibmvmc_max_hmcs = MAX_HMCS;
2335 } else if (ibmvmc_max_hmcs < MIN_HMCS) {
2336 pr_warn("ibmvmc: Max HMCs increased to %d\n", MIN_HMCS);
2337 ibmvmc_max_hmcs = MIN_HMCS;
2338 }
2339}
2340
2341static struct miscdevice ibmvmc_miscdev = {
2342 .name = ibmvmc_driver_name,
2343 .minor = MISC_DYNAMIC_MINOR,
2344 .fops = &ibmvmc_fops,
2345};
2346
2347static int __init ibmvmc_module_init(void)
2348{
2349 int rc, i, j;
2350
2351 ibmvmc.state = ibmvmc_state_initial;
2352 pr_info("ibmvmc: version %s\n", IBMVMC_DRIVER_VERSION);
2353
2354 rc = misc_register(&ibmvmc_miscdev);
2355 if (rc) {
2356 pr_err("ibmvmc: misc registration failed\n");
2357 goto misc_register_failed;
2358 }
2359 pr_info("ibmvmc: node %d:%d\n", MISC_MAJOR,
2360 ibmvmc_miscdev.minor);
2361
2362 /* Initialize data structures */
2363 memset(hmcs, 0, sizeof(struct ibmvmc_hmc) * MAX_HMCS);
2364 for (i = 0; i < MAX_HMCS; i++) {
2365 spin_lock_init(&hmcs[i].lock);
2366 hmcs[i].state = ibmhmc_state_free;
2367 for (j = 0; j < MAX_BUF_POOL_SIZE; j++)
2368 hmcs[i].queue_outbound_msgs[j] = VMC_INVALID_BUFFER_ID;
2369 }
2370
2371 /* Sanity check module parms */
2372 ibmvmc_scrub_module_parms();
2373
2374 /*
2375 * Initialize some reasonable values. Might be negotiated smaller
2376 * values during the capabilities exchange.
2377 */
2378 ibmvmc.max_mtu = ibmvmc_max_mtu;
2379 ibmvmc.max_buffer_pool_size = ibmvmc_max_buf_pool_size;
2380 ibmvmc.max_hmc_index = ibmvmc_max_hmcs - 1;
2381
2382 rc = vio_register_driver(&ibmvmc_driver);
2383
2384 if (rc) {
2385 pr_err("ibmvmc: rc %d from vio_register_driver\n", rc);
2386 goto vio_reg_failed;
2387 }
2388
2389 return 0;
2390
2391vio_reg_failed:
2392 misc_deregister(&ibmvmc_miscdev);
2393misc_register_failed:
2394 return rc;
2395}
2396
2397static void __exit ibmvmc_module_exit(void)
2398{
2399 pr_info("ibmvmc: module exit\n");
2400 vio_unregister_driver(&ibmvmc_driver);
2401 misc_deregister(&ibmvmc_miscdev);
2402}
2403
2404module_init(ibmvmc_module_init);
2405module_exit(ibmvmc_module_exit);
2406
2407module_param_named(buf_pool_size, ibmvmc_max_buf_pool_size,
2408 int, 0644);
2409MODULE_PARM_DESC(buf_pool_size, "Buffer pool size");
2410module_param_named(max_hmcs, ibmvmc_max_hmcs, int, 0644);
2411MODULE_PARM_DESC(max_hmcs, "Max HMCs");
2412module_param_named(max_mtu, ibmvmc_max_mtu, int, 0644);
2413MODULE_PARM_DESC(max_mtu, "Max MTU");
2414
2415MODULE_AUTHOR("Steven Royer <seroyer@linux.vnet.ibm.com>");
2416MODULE_DESCRIPTION("IBM VMC");
2417MODULE_VERSION(IBMVMC_DRIVER_VERSION);
2418MODULE_LICENSE("GPL v2");
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-25 02:10:55 -0400