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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 | */ | |
42 | static DECLARE_WAIT_QUEUE_HEAD(ibmvmc_read_wait); | |
43 | ||
44 | static const char ibmvmc_driver_name[] = "ibmvmc"; | |
45 | ||
46 | static struct ibmvmc_struct ibmvmc; | |
47 | static struct ibmvmc_hmc hmcs[MAX_HMCS]; | |
48 | static struct crq_server_adapter ibmvmc_adapter; | |
49 | ||
50 | static int ibmvmc_max_buf_pool_size = DEFAULT_BUF_POOL_SIZE; | |
51 | static int ibmvmc_max_hmcs = DEFAULT_HMCS; | |
52 | static int ibmvmc_max_mtu = DEFAULT_MTU; | |
53 | ||
54 | static 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 | ||
70 | static 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 | */ | |
94 | static 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 | */ | |
122 | static 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 | */ | |
142 | static 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 | */ | |
172 | static 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 | */ | |
205 | static 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 | */ | |
240 | static 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 | */ | |
272 | static void *alloc_dma_buffer(struct vio_dev *vdev, size_t size, | |
273 | dma_addr_t *dma_handle) | |
274 | { | |
275 | /* allocate memory */ | |
97b715b6 | 276 | void *buffer = kzalloc(size, GFP_ATOMIC); |
0eca353e BL |
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; | |
453431a5 | 289 | kfree_sensitive(buffer); |
0eca353e BL |
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 | */ | |
306 | static 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 */ | |
453431a5 | 313 | kfree_sensitive(vaddr); |
0eca353e BL |
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 | */ | |
324 | static 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 | */ | |
356 | static 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 | */ | |
390 | static 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 | */ | |
408 | static 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 | */ | |
444 | static 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 | */ | |
478 | static 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 | */ | |
543 | static 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 | */ | |
605 | static 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 | */ | |
651 | static 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 | */ | |
692 | static 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 | */ | |
733 | static 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 | |
18248659 | 763 | * @msg_len: message length field |
0eca353e BL |
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 | */ | |
777 | static 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 | |
e25df781 | 823 | * Non-zero - Failure |
0eca353e BL |
824 | */ |
825 | static int ibmvmc_open(struct inode *inode, struct file *file) | |
826 | { | |
827 | struct ibmvmc_file_session *session; | |
0eca353e BL |
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); | |
e25df781 GS |
834 | if (!session) |
835 | return -ENOMEM; | |
836 | ||
0eca353e BL |
837 | session->file = file; |
838 | file->private_data = session; | |
839 | ||
e25df781 | 840 | return 0; |
0eca353e BL |
841 | } |
842 | ||
843 | /** | |
844 | * ibmvmc_close - Close Session | |
845 | * | |
846 | * @inode: inode struct | |
847 | * @file: file struct | |
848 | * | |
849 | * Return: | |
850 | * 0 - Success | |
851 | * Non-zero - Failure | |
852 | */ | |
853 | static int ibmvmc_close(struct inode *inode, struct file *file) | |
854 | { | |
855 | struct ibmvmc_file_session *session; | |
856 | struct ibmvmc_hmc *hmc; | |
857 | int rc = 0; | |
858 | unsigned long flags; | |
859 | ||
860 | pr_debug("%s: file = 0x%lx, state = 0x%x\n", __func__, | |
861 | (unsigned long)file, ibmvmc.state); | |
862 | ||
863 | session = file->private_data; | |
864 | if (!session) | |
865 | return -EIO; | |
866 | ||
867 | hmc = session->hmc; | |
868 | if (hmc) { | |
869 | if (!hmc->adapter) | |
870 | return -EIO; | |
871 | ||
872 | if (ibmvmc.state == ibmvmc_state_failed) { | |
873 | dev_warn(hmc->adapter->dev, "close: state_failed\n"); | |
874 | return -EIO; | |
875 | } | |
876 | ||
877 | spin_lock_irqsave(&hmc->lock, flags); | |
878 | if (hmc->state >= ibmhmc_state_opening) { | |
879 | rc = ibmvmc_send_close(hmc); | |
880 | if (rc) | |
881 | dev_warn(hmc->adapter->dev, "close: send_close failed.\n"); | |
882 | } | |
883 | spin_unlock_irqrestore(&hmc->lock, flags); | |
884 | } | |
885 | ||
453431a5 | 886 | kfree_sensitive(session); |
0eca353e BL |
887 | |
888 | return rc; | |
889 | } | |
890 | ||
891 | /** | |
892 | * ibmvmc_read - Read | |
893 | * | |
894 | * @file: file struct | |
895 | * @buf: Character buffer | |
896 | * @nbytes: Size in bytes | |
897 | * @ppos: Offset | |
898 | * | |
899 | * Return: | |
900 | * 0 - Success | |
901 | * Non-zero - Failure | |
902 | */ | |
903 | static ssize_t ibmvmc_read(struct file *file, char *buf, size_t nbytes, | |
904 | loff_t *ppos) | |
905 | { | |
906 | struct ibmvmc_file_session *session; | |
907 | struct ibmvmc_hmc *hmc; | |
908 | struct crq_server_adapter *adapter; | |
909 | struct ibmvmc_buffer *buffer; | |
910 | ssize_t n; | |
911 | ssize_t retval = 0; | |
912 | unsigned long flags; | |
913 | DEFINE_WAIT(wait); | |
914 | ||
915 | pr_debug("ibmvmc: read: file = 0x%lx, buf = 0x%lx, nbytes = 0x%lx\n", | |
916 | (unsigned long)file, (unsigned long)buf, | |
917 | (unsigned long)nbytes); | |
918 | ||
919 | if (nbytes == 0) | |
920 | return 0; | |
921 | ||
922 | if (nbytes > ibmvmc.max_mtu) { | |
923 | pr_warn("ibmvmc: read: nbytes invalid 0x%x\n", | |
924 | (unsigned int)nbytes); | |
925 | return -EINVAL; | |
926 | } | |
927 | ||
928 | session = file->private_data; | |
929 | if (!session) { | |
930 | pr_warn("ibmvmc: read: no session\n"); | |
931 | return -EIO; | |
932 | } | |
933 | ||
934 | hmc = session->hmc; | |
935 | if (!hmc) { | |
936 | pr_warn("ibmvmc: read: no hmc\n"); | |
937 | return -EIO; | |
938 | } | |
939 | ||
940 | adapter = hmc->adapter; | |
941 | if (!adapter) { | |
942 | pr_warn("ibmvmc: read: no adapter\n"); | |
943 | return -EIO; | |
944 | } | |
945 | ||
946 | do { | |
947 | prepare_to_wait(&ibmvmc_read_wait, &wait, TASK_INTERRUPTIBLE); | |
948 | ||
949 | spin_lock_irqsave(&hmc->lock, flags); | |
950 | if (hmc->queue_tail != hmc->queue_head) | |
951 | /* Data is available */ | |
952 | break; | |
953 | ||
954 | spin_unlock_irqrestore(&hmc->lock, flags); | |
955 | ||
956 | if (!session->valid) { | |
957 | retval = -EBADFD; | |
958 | goto out; | |
959 | } | |
960 | if (file->f_flags & O_NONBLOCK) { | |
961 | retval = -EAGAIN; | |
962 | goto out; | |
963 | } | |
964 | ||
965 | schedule(); | |
966 | ||
967 | if (signal_pending(current)) { | |
968 | retval = -ERESTARTSYS; | |
969 | goto out; | |
970 | } | |
971 | } while (1); | |
972 | ||
973 | buffer = &(hmc->buffer[hmc->queue_outbound_msgs[hmc->queue_tail]]); | |
974 | hmc->queue_tail++; | |
975 | if (hmc->queue_tail == ibmvmc_max_buf_pool_size) | |
976 | hmc->queue_tail = 0; | |
977 | spin_unlock_irqrestore(&hmc->lock, flags); | |
978 | ||
979 | nbytes = min_t(size_t, nbytes, buffer->msg_len); | |
980 | n = copy_to_user((void *)buf, buffer->real_addr_local, nbytes); | |
981 | dev_dbg(adapter->dev, "read: copy to user nbytes = 0x%lx.\n", nbytes); | |
982 | ibmvmc_free_hmc_buffer(hmc, buffer); | |
983 | retval = nbytes; | |
984 | ||
985 | if (n) { | |
986 | dev_warn(adapter->dev, "read: copy to user failed.\n"); | |
987 | retval = -EFAULT; | |
988 | } | |
989 | ||
990 | out: | |
991 | finish_wait(&ibmvmc_read_wait, &wait); | |
992 | dev_dbg(adapter->dev, "read: out %ld\n", retval); | |
993 | return retval; | |
994 | } | |
995 | ||
996 | /** | |
997 | * ibmvmc_poll - Poll | |
998 | * | |
999 | * @file: file struct | |
1000 | * @wait: Poll Table | |
1001 | * | |
1002 | * Return: | |
1003 | * poll.h return values | |
1004 | */ | |
1005 | static unsigned int ibmvmc_poll(struct file *file, poll_table *wait) | |
1006 | { | |
1007 | struct ibmvmc_file_session *session; | |
1008 | struct ibmvmc_hmc *hmc; | |
1009 | unsigned int mask = 0; | |
1010 | ||
1011 | session = file->private_data; | |
1012 | if (!session) | |
1013 | return 0; | |
1014 | ||
1015 | hmc = session->hmc; | |
1016 | if (!hmc) | |
1017 | return 0; | |
1018 | ||
1019 | poll_wait(file, &ibmvmc_read_wait, wait); | |
1020 | ||
1021 | if (hmc->queue_head != hmc->queue_tail) | |
1022 | mask |= POLLIN | POLLRDNORM; | |
1023 | ||
1024 | return mask; | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * ibmvmc_write - Write | |
1029 | * | |
1030 | * @file: file struct | |
18248659 | 1031 | * @buffer: Character buffer |
0eca353e BL |
1032 | * @count: Count field |
1033 | * @ppos: Offset | |
1034 | * | |
1035 | * Return: | |
1036 | * 0 - Success | |
1037 | * Non-zero - Failure | |
1038 | */ | |
1039 | static ssize_t ibmvmc_write(struct file *file, const char *buffer, | |
1040 | size_t count, loff_t *ppos) | |
1041 | { | |
1042 | struct ibmvmc_buffer *vmc_buffer; | |
1043 | struct ibmvmc_file_session *session; | |
1044 | struct crq_server_adapter *adapter; | |
1045 | struct ibmvmc_hmc *hmc; | |
1046 | unsigned char *buf; | |
1047 | unsigned long flags; | |
1048 | size_t bytes; | |
1049 | const char *p = buffer; | |
1050 | size_t c = count; | |
1051 | int ret = 0; | |
1052 | ||
1053 | session = file->private_data; | |
1054 | if (!session) | |
1055 | return -EIO; | |
1056 | ||
1057 | hmc = session->hmc; | |
1058 | if (!hmc) | |
1059 | return -EIO; | |
1060 | ||
1061 | spin_lock_irqsave(&hmc->lock, flags); | |
1062 | if (hmc->state == ibmhmc_state_free) { | |
1063 | /* HMC connection is not valid (possibly was reset under us). */ | |
1064 | ret = -EIO; | |
1065 | goto out; | |
1066 | } | |
1067 | ||
1068 | adapter = hmc->adapter; | |
1069 | if (!adapter) { | |
1070 | ret = -EIO; | |
1071 | goto out; | |
1072 | } | |
1073 | ||
1074 | if (count > ibmvmc.max_mtu) { | |
1075 | dev_warn(adapter->dev, "invalid buffer size 0x%lx\n", | |
1076 | (unsigned long)count); | |
1077 | ret = -EIO; | |
1078 | goto out; | |
1079 | } | |
1080 | ||
1081 | /* Waiting for the open resp message to the ioctl(1) - retry */ | |
1082 | if (hmc->state == ibmhmc_state_opening) { | |
1083 | ret = -EBUSY; | |
1084 | goto out; | |
1085 | } | |
1086 | ||
1087 | /* Make sure the ioctl() was called & the open msg sent, and that | |
1088 | * the HMC connection has not failed. | |
1089 | */ | |
1090 | if (hmc->state != ibmhmc_state_ready) { | |
1091 | ret = -EIO; | |
1092 | goto out; | |
1093 | } | |
1094 | ||
1095 | vmc_buffer = ibmvmc_get_valid_hmc_buffer(hmc->index); | |
1096 | if (!vmc_buffer) { | |
1097 | /* No buffer available for the msg send, or we have not yet | |
1098 | * completed the open/open_resp sequence. Retry until this is | |
1099 | * complete. | |
1100 | */ | |
1101 | ret = -EBUSY; | |
1102 | goto out; | |
1103 | } | |
1104 | if (!vmc_buffer->real_addr_local) { | |
1105 | dev_err(adapter->dev, "no buffer storage assigned\n"); | |
1106 | ret = -EIO; | |
1107 | goto out; | |
1108 | } | |
1109 | buf = vmc_buffer->real_addr_local; | |
1110 | ||
1111 | while (c > 0) { | |
1112 | bytes = min_t(size_t, c, vmc_buffer->size); | |
1113 | ||
1114 | bytes -= copy_from_user(buf, p, bytes); | |
1115 | if (!bytes) { | |
1116 | ret = -EFAULT; | |
1117 | goto out; | |
1118 | } | |
1119 | c -= bytes; | |
1120 | p += bytes; | |
1121 | } | |
1122 | if (p == buffer) | |
1123 | goto out; | |
1124 | ||
1125 | file->f_path.dentry->d_inode->i_mtime = current_time(file_inode(file)); | |
1126 | mark_inode_dirty(file->f_path.dentry->d_inode); | |
1127 | ||
1128 | dev_dbg(adapter->dev, "write: file = 0x%lx, count = 0x%lx\n", | |
1129 | (unsigned long)file, (unsigned long)count); | |
1130 | ||
1131 | ibmvmc_send_msg(adapter, vmc_buffer, hmc, count); | |
1132 | ret = p - buffer; | |
1133 | out: | |
1134 | spin_unlock_irqrestore(&hmc->lock, flags); | |
1135 | return (ssize_t)(ret); | |
1136 | } | |
1137 | ||
1138 | /** | |
1139 | * ibmvmc_setup_hmc - Setup the HMC | |
1140 | * | |
1141 | * @session: ibmvmc_file_session struct | |
1142 | * | |
1143 | * Return: | |
1144 | * 0 - Success | |
1145 | * Non-zero - Failure | |
1146 | */ | |
1147 | static long ibmvmc_setup_hmc(struct ibmvmc_file_session *session) | |
1148 | { | |
1149 | struct ibmvmc_hmc *hmc; | |
1150 | unsigned int valid, free, index; | |
1151 | ||
1152 | if (ibmvmc.state == ibmvmc_state_failed) { | |
1153 | pr_warn("ibmvmc: Reserve HMC: state_failed\n"); | |
1154 | return -EIO; | |
1155 | } | |
1156 | ||
1157 | if (ibmvmc.state < ibmvmc_state_ready) { | |
1158 | pr_warn("ibmvmc: Reserve HMC: not state_ready\n"); | |
1159 | return -EAGAIN; | |
1160 | } | |
1161 | ||
1162 | /* Device is busy until capabilities have been exchanged and we | |
1163 | * have a generic buffer for each possible HMC connection. | |
1164 | */ | |
1165 | for (index = 0; index <= ibmvmc.max_hmc_index; index++) { | |
1166 | valid = 0; | |
1167 | ibmvmc_count_hmc_buffers(index, &valid, &free); | |
1168 | if (valid == 0) { | |
1169 | pr_warn("ibmvmc: buffers not ready for index %d\n", | |
1170 | index); | |
1171 | return -ENOBUFS; | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | /* Get an hmc object, and transition to ibmhmc_state_initial */ | |
1176 | hmc = ibmvmc_get_free_hmc(); | |
1177 | if (!hmc) { | |
1178 | pr_warn("%s: free hmc not found\n", __func__); | |
1179 | return -EBUSY; | |
1180 | } | |
1181 | ||
1182 | hmc->session = hmc->session + 1; | |
1183 | if (hmc->session == 0xff) | |
1184 | hmc->session = 1; | |
1185 | ||
1186 | session->hmc = hmc; | |
1187 | hmc->adapter = &ibmvmc_adapter; | |
1188 | hmc->file_session = session; | |
1189 | session->valid = 1; | |
1190 | ||
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | /** | |
1195 | * ibmvmc_ioctl_sethmcid - IOCTL Set HMC ID | |
1196 | * | |
1197 | * @session: ibmvmc_file_session struct | |
1198 | * @new_hmc_id: HMC id field | |
1199 | * | |
1200 | * IOCTL command to setup the hmc id | |
1201 | * | |
1202 | * Return: | |
1203 | * 0 - Success | |
1204 | * Non-zero - Failure | |
1205 | */ | |
1206 | static long ibmvmc_ioctl_sethmcid(struct ibmvmc_file_session *session, | |
1207 | unsigned char __user *new_hmc_id) | |
1208 | { | |
1209 | struct ibmvmc_hmc *hmc; | |
1210 | struct ibmvmc_buffer *buffer; | |
1211 | size_t bytes; | |
1212 | char print_buffer[HMC_ID_LEN + 1]; | |
1213 | unsigned long flags; | |
1214 | long rc = 0; | |
1215 | ||
1216 | /* Reserve HMC session */ | |
1217 | hmc = session->hmc; | |
1218 | if (!hmc) { | |
1219 | rc = ibmvmc_setup_hmc(session); | |
1220 | if (rc) | |
1221 | return rc; | |
1222 | ||
1223 | hmc = session->hmc; | |
1224 | if (!hmc) { | |
1225 | pr_err("ibmvmc: setup_hmc success but no hmc\n"); | |
1226 | return -EIO; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | if (hmc->state != ibmhmc_state_initial) { | |
1231 | pr_warn("ibmvmc: sethmcid: invalid state to send open 0x%x\n", | |
1232 | hmc->state); | |
1233 | return -EIO; | |
1234 | } | |
1235 | ||
1236 | bytes = copy_from_user(hmc->hmc_id, new_hmc_id, HMC_ID_LEN); | |
1237 | if (bytes) | |
1238 | return -EFAULT; | |
1239 | ||
1240 | /* Send Open Session command */ | |
1241 | spin_lock_irqsave(&hmc->lock, flags); | |
1242 | buffer = ibmvmc_get_valid_hmc_buffer(hmc->index); | |
1243 | spin_unlock_irqrestore(&hmc->lock, flags); | |
1244 | ||
1245 | if (!buffer || !buffer->real_addr_local) { | |
1246 | pr_warn("ibmvmc: sethmcid: no buffer available\n"); | |
1247 | return -EIO; | |
1248 | } | |
1249 | ||
1250 | /* Make sure buffer is NULL terminated before trying to print it */ | |
1251 | memset(print_buffer, 0, HMC_ID_LEN + 1); | |
1252 | strncpy(print_buffer, hmc->hmc_id, HMC_ID_LEN); | |
1253 | pr_info("ibmvmc: sethmcid: Set HMC ID: \"%s\"\n", print_buffer); | |
1254 | ||
1255 | memcpy(buffer->real_addr_local, hmc->hmc_id, HMC_ID_LEN); | |
1256 | /* RDMA over ID, send open msg, change state to ibmhmc_state_opening */ | |
1257 | rc = ibmvmc_send_open(buffer, hmc); | |
1258 | ||
1259 | return rc; | |
1260 | } | |
1261 | ||
1262 | /** | |
1263 | * ibmvmc_ioctl_query - IOCTL Query | |
1264 | * | |
1265 | * @session: ibmvmc_file_session struct | |
1266 | * @ret_struct: ibmvmc_query_struct | |
1267 | * | |
1268 | * Return: | |
1269 | * 0 - Success | |
1270 | * Non-zero - Failure | |
1271 | */ | |
1272 | static long ibmvmc_ioctl_query(struct ibmvmc_file_session *session, | |
1273 | struct ibmvmc_query_struct __user *ret_struct) | |
1274 | { | |
1275 | struct ibmvmc_query_struct query_struct; | |
1276 | size_t bytes; | |
1277 | ||
1278 | memset(&query_struct, 0, sizeof(query_struct)); | |
1279 | query_struct.have_vmc = (ibmvmc.state > ibmvmc_state_initial); | |
1280 | query_struct.state = ibmvmc.state; | |
1281 | query_struct.vmc_drc_index = ibmvmc.vmc_drc_index; | |
1282 | ||
1283 | bytes = copy_to_user(ret_struct, &query_struct, | |
1284 | sizeof(query_struct)); | |
1285 | if (bytes) | |
1286 | return -EFAULT; | |
1287 | ||
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | /** | |
1292 | * ibmvmc_ioctl_requestvmc - IOCTL Request VMC | |
1293 | * | |
1294 | * @session: ibmvmc_file_session struct | |
1295 | * @ret_vmc_index: VMC Index | |
1296 | * | |
1297 | * Return: | |
1298 | * 0 - Success | |
1299 | * Non-zero - Failure | |
1300 | */ | |
1301 | static long ibmvmc_ioctl_requestvmc(struct ibmvmc_file_session *session, | |
1302 | u32 __user *ret_vmc_index) | |
1303 | { | |
1304 | /* TODO: (adreznec) Add locking to control multiple process access */ | |
1305 | size_t bytes; | |
1306 | long rc; | |
1307 | u32 vmc_drc_index; | |
1308 | ||
1309 | /* Call to request the VMC device from phyp*/ | |
1310 | rc = h_request_vmc(&vmc_drc_index); | |
1311 | pr_debug("ibmvmc: requestvmc: H_REQUEST_VMC rc = 0x%lx\n", rc); | |
1312 | ||
1313 | if (rc == H_SUCCESS) { | |
1314 | rc = 0; | |
1315 | } else if (rc == H_FUNCTION) { | |
1316 | pr_err("ibmvmc: requestvmc: h_request_vmc not supported\n"); | |
1317 | return -EPERM; | |
1318 | } else if (rc == H_AUTHORITY) { | |
1319 | pr_err("ibmvmc: requestvmc: hypervisor denied vmc request\n"); | |
1320 | return -EPERM; | |
1321 | } else if (rc == H_HARDWARE) { | |
1322 | pr_err("ibmvmc: requestvmc: hypervisor hardware fault\n"); | |
1323 | return -EIO; | |
1324 | } else if (rc == H_RESOURCE) { | |
1325 | pr_err("ibmvmc: requestvmc: vmc resource unavailable\n"); | |
1326 | return -ENODEV; | |
1327 | } else if (rc == H_NOT_AVAILABLE) { | |
1328 | pr_err("ibmvmc: requestvmc: system cannot be vmc managed\n"); | |
1329 | return -EPERM; | |
1330 | } else if (rc == H_PARAMETER) { | |
1331 | pr_err("ibmvmc: requestvmc: invalid parameter\n"); | |
1332 | return -EINVAL; | |
1333 | } | |
1334 | ||
1335 | /* Success, set the vmc index in global struct */ | |
1336 | ibmvmc.vmc_drc_index = vmc_drc_index; | |
1337 | ||
1338 | bytes = copy_to_user(ret_vmc_index, &vmc_drc_index, | |
1339 | sizeof(*ret_vmc_index)); | |
1340 | if (bytes) { | |
1341 | pr_warn("ibmvmc: requestvmc: copy to user failed.\n"); | |
1342 | return -EFAULT; | |
1343 | } | |
1344 | return rc; | |
1345 | } | |
1346 | ||
1347 | /** | |
1348 | * ibmvmc_ioctl - IOCTL | |
1349 | * | |
18248659 | 1350 | * @file: file information |
0eca353e BL |
1351 | * @cmd: cmd field |
1352 | * @arg: Argument field | |
1353 | * | |
1354 | * Return: | |
1355 | * 0 - Success | |
1356 | * Non-zero - Failure | |
1357 | */ | |
1358 | static long ibmvmc_ioctl(struct file *file, | |
1359 | unsigned int cmd, unsigned long arg) | |
1360 | { | |
1361 | struct ibmvmc_file_session *session = file->private_data; | |
1362 | ||
1363 | pr_debug("ibmvmc: ioctl file=0x%lx, cmd=0x%x, arg=0x%lx, ses=0x%lx\n", | |
1364 | (unsigned long)file, cmd, arg, | |
1365 | (unsigned long)session); | |
1366 | ||
1367 | if (!session) { | |
1368 | pr_warn("ibmvmc: ioctl: no session\n"); | |
1369 | return -EIO; | |
1370 | } | |
1371 | ||
1372 | switch (cmd) { | |
1373 | case VMC_IOCTL_SETHMCID: | |
1374 | return ibmvmc_ioctl_sethmcid(session, | |
1375 | (unsigned char __user *)arg); | |
1376 | case VMC_IOCTL_QUERY: | |
1377 | return ibmvmc_ioctl_query(session, | |
1378 | (struct ibmvmc_query_struct __user *)arg); | |
1379 | case VMC_IOCTL_REQUESTVMC: | |
1380 | return ibmvmc_ioctl_requestvmc(session, | |
1381 | (unsigned int __user *)arg); | |
1382 | default: | |
1383 | pr_warn("ibmvmc: unknown ioctl 0x%x\n", cmd); | |
1384 | return -EINVAL; | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | static const struct file_operations ibmvmc_fops = { | |
1389 | .owner = THIS_MODULE, | |
1390 | .read = ibmvmc_read, | |
1391 | .write = ibmvmc_write, | |
1392 | .poll = ibmvmc_poll, | |
1393 | .unlocked_ioctl = ibmvmc_ioctl, | |
1394 | .open = ibmvmc_open, | |
1395 | .release = ibmvmc_close, | |
1396 | }; | |
1397 | ||
1398 | /** | |
1399 | * ibmvmc_add_buffer - Add Buffer | |
1400 | * | |
1401 | * @adapter: crq_server_adapter struct | |
1402 | * @crq: ibmvmc_crq_msg struct | |
1403 | * | |
1404 | * This message transfers a buffer from hypervisor ownership to management | |
1405 | * partition ownership. The LIOBA is obtained from the virtual TCE table | |
1406 | * associated with the hypervisor side of the VMC device, and points to a | |
1407 | * buffer of size MTU (as established in the capabilities exchange). | |
1408 | * | |
1409 | * Typical flow for ading buffers: | |
1410 | * 1. A new management application connection is opened by the management | |
1411 | * partition. | |
1412 | * 2. The hypervisor assigns new buffers for the traffic associated with | |
1413 | * that connection. | |
1414 | * 3. The hypervisor sends VMC Add Buffer messages to the management | |
1415 | * partition, informing it of the new buffers. | |
1416 | * 4. The hypervisor sends an HMC protocol message (to the management | |
1417 | * application) notifying it of the new buffers. This informs the | |
1418 | * application that it has buffers available for sending HMC | |
1419 | * commands. | |
1420 | * | |
1421 | * Return: | |
1422 | * 0 - Success | |
1423 | * Non-zero - Failure | |
1424 | */ | |
1425 | static int ibmvmc_add_buffer(struct crq_server_adapter *adapter, | |
1426 | struct ibmvmc_crq_msg *crq) | |
1427 | { | |
1428 | struct ibmvmc_buffer *buffer; | |
1429 | u8 hmc_index; | |
1430 | u8 hmc_session; | |
1431 | u16 buffer_id; | |
1432 | unsigned long flags; | |
1433 | int rc = 0; | |
1434 | ||
1435 | if (!crq) | |
1436 | return -1; | |
1437 | ||
1438 | hmc_session = crq->hmc_session; | |
1439 | hmc_index = crq->hmc_index; | |
1440 | buffer_id = be16_to_cpu(crq->var2.buffer_id); | |
1441 | ||
1442 | if (hmc_index > ibmvmc.max_hmc_index) { | |
1443 | dev_err(adapter->dev, "add_buffer: invalid hmc_index = 0x%x\n", | |
1444 | hmc_index); | |
1445 | ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_HMC_INDEX, | |
1446 | hmc_session, hmc_index, buffer_id); | |
1447 | return -1; | |
1448 | } | |
1449 | ||
1450 | if (buffer_id >= ibmvmc.max_buffer_pool_size) { | |
1451 | dev_err(adapter->dev, "add_buffer: invalid buffer_id = 0x%x\n", | |
1452 | buffer_id); | |
1453 | ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_BUFFER_ID, | |
1454 | hmc_session, hmc_index, buffer_id); | |
1455 | return -1; | |
1456 | } | |
1457 | ||
1458 | spin_lock_irqsave(&hmcs[hmc_index].lock, flags); | |
1459 | buffer = &hmcs[hmc_index].buffer[buffer_id]; | |
1460 | ||
1461 | if (buffer->real_addr_local || buffer->dma_addr_local) { | |
1462 | dev_warn(adapter->dev, "add_buffer: already allocated id = 0x%lx\n", | |
1463 | (unsigned long)buffer_id); | |
1464 | spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags); | |
1465 | ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_BUFFER_ID, | |
1466 | hmc_session, hmc_index, buffer_id); | |
1467 | return -1; | |
1468 | } | |
1469 | ||
1470 | buffer->real_addr_local = alloc_dma_buffer(to_vio_dev(adapter->dev), | |
1471 | ibmvmc.max_mtu, | |
1472 | &buffer->dma_addr_local); | |
1473 | ||
1474 | if (!buffer->real_addr_local) { | |
1475 | dev_err(adapter->dev, "add_buffer: alloc_dma_buffer failed.\n"); | |
1476 | spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags); | |
1477 | ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INTERFACE_FAILURE, | |
1478 | hmc_session, hmc_index, buffer_id); | |
1479 | return -1; | |
1480 | } | |
1481 | ||
1482 | buffer->dma_addr_remote = be32_to_cpu(crq->var3.lioba); | |
1483 | buffer->size = ibmvmc.max_mtu; | |
1484 | buffer->owner = crq->var1.owner; | |
1485 | buffer->free = 1; | |
1486 | /* Must ensure valid==1 is observable only after all other fields are */ | |
1487 | dma_wmb(); | |
1488 | buffer->valid = 1; | |
1489 | buffer->id = buffer_id; | |
1490 | ||
1491 | dev_dbg(adapter->dev, "add_buffer: successfully added a buffer:\n"); | |
1492 | dev_dbg(adapter->dev, " index: %d, session: %d, buffer: 0x%x, owner: %d\n", | |
1493 | hmc_index, hmc_session, buffer_id, buffer->owner); | |
1494 | dev_dbg(adapter->dev, " local: 0x%x, remote: 0x%x\n", | |
1495 | (u32)buffer->dma_addr_local, | |
1496 | (u32)buffer->dma_addr_remote); | |
1497 | spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags); | |
1498 | ||
1499 | ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_SUCCESS, hmc_session, | |
1500 | hmc_index, buffer_id); | |
1501 | ||
1502 | return rc; | |
1503 | } | |
1504 | ||
1505 | /** | |
1506 | * ibmvmc_rem_buffer - Remove Buffer | |
1507 | * | |
1508 | * @adapter: crq_server_adapter struct | |
1509 | * @crq: ibmvmc_crq_msg struct | |
1510 | * | |
1511 | * This message requests an HMC buffer to be transferred from management | |
1512 | * partition ownership to hypervisor ownership. The management partition may | |
1513 | * not be able to satisfy the request at a particular point in time if all its | |
1514 | * buffers are in use. The management partition requires a depth of at least | |
1515 | * one inbound buffer to allow management application commands to flow to the | |
1516 | * hypervisor. It is, therefore, an interface error for the hypervisor to | |
1517 | * attempt to remove the management partition's last buffer. | |
1518 | * | |
1519 | * The hypervisor is expected to manage buffer usage with the management | |
1520 | * application directly and inform the management partition when buffers may be | |
1521 | * removed. The typical flow for removing buffers: | |
1522 | * | |
1523 | * 1. The management application no longer needs a communication path to a | |
1524 | * particular hypervisor function. That function is closed. | |
1525 | * 2. The hypervisor and the management application quiesce all traffic to that | |
1526 | * function. The hypervisor requests a reduction in buffer pool size. | |
1527 | * 3. The management application acknowledges the reduction in buffer pool size. | |
1528 | * 4. The hypervisor sends a Remove Buffer message to the management partition, | |
1529 | * informing it of the reduction in buffers. | |
1530 | * 5. The management partition verifies it can remove the buffer. This is | |
1531 | * possible if buffers have been quiesced. | |
1532 | * | |
1533 | * Return: | |
1534 | * 0 - Success | |
1535 | * Non-zero - Failure | |
1536 | */ | |
1537 | /* | |
1538 | * The hypervisor requested that we pick an unused buffer, and return it. | |
1539 | * Before sending the buffer back, we free any storage associated with the | |
1540 | * buffer. | |
1541 | */ | |
1542 | static int ibmvmc_rem_buffer(struct crq_server_adapter *adapter, | |
1543 | struct ibmvmc_crq_msg *crq) | |
1544 | { | |
1545 | struct ibmvmc_buffer *buffer; | |
1546 | u8 hmc_index; | |
1547 | u8 hmc_session; | |
1548 | u16 buffer_id = 0; | |
1549 | unsigned long flags; | |
1550 | int rc = 0; | |
1551 | ||
1552 | if (!crq) | |
1553 | return -1; | |
1554 | ||
1555 | hmc_session = crq->hmc_session; | |
1556 | hmc_index = crq->hmc_index; | |
1557 | ||
1558 | if (hmc_index > ibmvmc.max_hmc_index) { | |
1559 | dev_warn(adapter->dev, "rem_buffer: invalid hmc_index = 0x%x\n", | |
1560 | hmc_index); | |
1561 | ibmvmc_send_rem_buffer_resp(adapter, VMC_MSG_INVALID_HMC_INDEX, | |
1562 | hmc_session, hmc_index, buffer_id); | |
1563 | return -1; | |
1564 | } | |
1565 | ||
1566 | spin_lock_irqsave(&hmcs[hmc_index].lock, flags); | |
1567 | buffer = ibmvmc_get_free_hmc_buffer(adapter, hmc_index); | |
1568 | if (!buffer) { | |
1569 | dev_info(adapter->dev, "rem_buffer: no buffer to remove\n"); | |
1570 | spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags); | |
1571 | ibmvmc_send_rem_buffer_resp(adapter, VMC_MSG_NO_BUFFER, | |
1572 | hmc_session, hmc_index, | |
1573 | VMC_INVALID_BUFFER_ID); | |
1574 | return -1; | |
1575 | } | |
1576 | ||
1577 | buffer_id = buffer->id; | |
1578 | ||
1579 | if (buffer->valid) | |
1580 | free_dma_buffer(to_vio_dev(adapter->dev), | |
1581 | ibmvmc.max_mtu, | |
1582 | buffer->real_addr_local, | |
1583 | buffer->dma_addr_local); | |
1584 | ||
1585 | memset(buffer, 0, sizeof(struct ibmvmc_buffer)); | |
1586 | spin_unlock_irqrestore(&hmcs[hmc_index].lock, flags); | |
1587 | ||
1588 | dev_dbg(adapter->dev, "rem_buffer: removed buffer 0x%x.\n", buffer_id); | |
1589 | ibmvmc_send_rem_buffer_resp(adapter, VMC_MSG_SUCCESS, hmc_session, | |
1590 | hmc_index, buffer_id); | |
1591 | ||
1592 | return rc; | |
1593 | } | |
1594 | ||
1595 | static int ibmvmc_recv_msg(struct crq_server_adapter *adapter, | |
1596 | struct ibmvmc_crq_msg *crq) | |
1597 | { | |
1598 | struct ibmvmc_buffer *buffer; | |
1599 | struct ibmvmc_hmc *hmc; | |
1600 | unsigned long msg_len; | |
1601 | u8 hmc_index; | |
1602 | u8 hmc_session; | |
1603 | u16 buffer_id; | |
1604 | unsigned long flags; | |
1605 | int rc = 0; | |
1606 | ||
1607 | if (!crq) | |
1608 | return -1; | |
1609 | ||
1610 | /* Hypervisor writes CRQs directly into our memory in big endian */ | |
1611 | dev_dbg(adapter->dev, "Recv_msg: msg from HV 0x%016llx 0x%016llx\n", | |
1612 | be64_to_cpu(*((unsigned long *)crq)), | |
1613 | be64_to_cpu(*(((unsigned long *)crq) + 1))); | |
1614 | ||
1615 | hmc_session = crq->hmc_session; | |
1616 | hmc_index = crq->hmc_index; | |
1617 | buffer_id = be16_to_cpu(crq->var2.buffer_id); | |
1618 | msg_len = be32_to_cpu(crq->var3.msg_len); | |
1619 | ||
1620 | if (hmc_index > ibmvmc.max_hmc_index) { | |
1621 | dev_err(adapter->dev, "Recv_msg: invalid hmc_index = 0x%x\n", | |
1622 | hmc_index); | |
1623 | ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_HMC_INDEX, | |
1624 | hmc_session, hmc_index, buffer_id); | |
1625 | return -1; | |
1626 | } | |
1627 | ||
1628 | if (buffer_id >= ibmvmc.max_buffer_pool_size) { | |
1629 | dev_err(adapter->dev, "Recv_msg: invalid buffer_id = 0x%x\n", | |
1630 | buffer_id); | |
1631 | ibmvmc_send_add_buffer_resp(adapter, VMC_MSG_INVALID_BUFFER_ID, | |
1632 | hmc_session, hmc_index, buffer_id); | |
1633 | return -1; | |
1634 | } | |
1635 | ||
1636 | hmc = &hmcs[hmc_index]; | |
1637 | spin_lock_irqsave(&hmc->lock, flags); | |
1638 | ||
1639 | if (hmc->state == ibmhmc_state_free) { | |
1640 | dev_err(adapter->dev, "Recv_msg: invalid hmc state = 0x%x\n", | |
1641 | hmc->state); | |
1642 | /* HMC connection is not valid (possibly was reset under us). */ | |
1643 | spin_unlock_irqrestore(&hmc->lock, flags); | |
1644 | return -1; | |
1645 | } | |
1646 | ||
1647 | buffer = &hmc->buffer[buffer_id]; | |
1648 | ||
1649 | if (buffer->valid == 0 || buffer->owner == VMC_BUF_OWNER_ALPHA) { | |
1650 | dev_err(adapter->dev, "Recv_msg: not valid, or not HV. 0x%x 0x%x\n", | |
1651 | buffer->valid, buffer->owner); | |
1652 | spin_unlock_irqrestore(&hmc->lock, flags); | |
1653 | return -1; | |
1654 | } | |
1655 | ||
1656 | /* RDMA the data into the partition. */ | |
1657 | rc = h_copy_rdma(msg_len, | |
1658 | adapter->riobn, | |
1659 | buffer->dma_addr_remote, | |
1660 | adapter->liobn, | |
1661 | buffer->dma_addr_local); | |
1662 | ||
1663 | dev_dbg(adapter->dev, "Recv_msg: msg_len = 0x%x, buffer_id = 0x%x, queue_head = 0x%x, hmc_idx = 0x%x\n", | |
1664 | (unsigned int)msg_len, (unsigned int)buffer_id, | |
1665 | (unsigned int)hmc->queue_head, (unsigned int)hmc_index); | |
1666 | buffer->msg_len = msg_len; | |
1667 | buffer->free = 0; | |
1668 | buffer->owner = VMC_BUF_OWNER_ALPHA; | |
1669 | ||
1670 | if (rc) { | |
1671 | dev_err(adapter->dev, "Failure in recv_msg: h_copy_rdma = 0x%x\n", | |
1672 | rc); | |
1673 | spin_unlock_irqrestore(&hmc->lock, flags); | |
1674 | return -1; | |
1675 | } | |
1676 | ||
1677 | /* Must be locked because read operates on the same data */ | |
1678 | hmc->queue_outbound_msgs[hmc->queue_head] = buffer_id; | |
1679 | hmc->queue_head++; | |
1680 | if (hmc->queue_head == ibmvmc_max_buf_pool_size) | |
1681 | hmc->queue_head = 0; | |
1682 | ||
1683 | if (hmc->queue_head == hmc->queue_tail) | |
1684 | dev_err(adapter->dev, "outbound buffer queue wrapped.\n"); | |
1685 | ||
1686 | spin_unlock_irqrestore(&hmc->lock, flags); | |
1687 | ||
1688 | wake_up_interruptible(&ibmvmc_read_wait); | |
1689 | ||
1690 | return 0; | |
1691 | } | |
1692 | ||
1693 | /** | |
1694 | * ibmvmc_process_capabilities - Process Capabilities | |
1695 | * | |
1696 | * @adapter: crq_server_adapter struct | |
1697 | * @crqp: ibmvmc_crq_msg struct | |
1698 | * | |
1699 | */ | |
1700 | static void ibmvmc_process_capabilities(struct crq_server_adapter *adapter, | |
1701 | struct ibmvmc_crq_msg *crqp) | |
1702 | { | |
1703 | struct ibmvmc_admin_crq_msg *crq = (struct ibmvmc_admin_crq_msg *)crqp; | |
1704 | ||
1705 | if ((be16_to_cpu(crq->version) >> 8) != | |
1706 | (IBMVMC_PROTOCOL_VERSION >> 8)) { | |
1707 | dev_err(adapter->dev, "init failed, incompatible versions 0x%x 0x%x\n", | |
1708 | be16_to_cpu(crq->version), | |
1709 | IBMVMC_PROTOCOL_VERSION); | |
1710 | ibmvmc.state = ibmvmc_state_failed; | |
1711 | return; | |
1712 | } | |
1713 | ||
1714 | ibmvmc.max_mtu = min_t(u32, ibmvmc_max_mtu, be32_to_cpu(crq->max_mtu)); | |
1715 | ibmvmc.max_buffer_pool_size = min_t(u16, ibmvmc_max_buf_pool_size, | |
1716 | be16_to_cpu(crq->pool_size)); | |
1717 | ibmvmc.max_hmc_index = min_t(u8, ibmvmc_max_hmcs, crq->max_hmc) - 1; | |
1718 | ibmvmc.state = ibmvmc_state_ready; | |
1719 | ||
1720 | dev_info(adapter->dev, "Capabilities: mtu=0x%x, pool_size=0x%x, max_hmc=0x%x\n", | |
1721 | ibmvmc.max_mtu, ibmvmc.max_buffer_pool_size, | |
1722 | ibmvmc.max_hmc_index); | |
1723 | } | |
1724 | ||
1725 | /** | |
1726 | * ibmvmc_validate_hmc_session - Validate HMC Session | |
1727 | * | |
1728 | * @adapter: crq_server_adapter struct | |
1729 | * @crq: ibmvmc_crq_msg struct | |
1730 | * | |
1731 | * Return: | |
1732 | * 0 - Success | |
1733 | * Non-zero - Failure | |
1734 | */ | |
1735 | static int ibmvmc_validate_hmc_session(struct crq_server_adapter *adapter, | |
1736 | struct ibmvmc_crq_msg *crq) | |
1737 | { | |
1738 | unsigned char hmc_index; | |
1739 | ||
1740 | hmc_index = crq->hmc_index; | |
1741 | ||
1742 | if (crq->hmc_session == 0) | |
1743 | return 0; | |
1744 | ||
1745 | if (hmc_index > ibmvmc.max_hmc_index) | |
1746 | return -1; | |
1747 | ||
1748 | if (hmcs[hmc_index].session != crq->hmc_session) { | |
1749 | dev_warn(adapter->dev, "Drop, bad session: expected 0x%x, recv 0x%x\n", | |
1750 | hmcs[hmc_index].session, crq->hmc_session); | |
1751 | return -1; | |
1752 | } | |
1753 | ||
1754 | return 0; | |
1755 | } | |
1756 | ||
1757 | /** | |
1758 | * ibmvmc_reset - Reset | |
1759 | * | |
1760 | * @adapter: crq_server_adapter struct | |
1761 | * @xport_event: export_event field | |
1762 | * | |
1763 | * Closes all HMC sessions and conditionally schedules a CRQ reset. | |
1764 | * @xport_event: If true, the partner closed their CRQ; we don't need to reset. | |
1765 | * If false, we need to schedule a CRQ reset. | |
1766 | */ | |
1767 | static void ibmvmc_reset(struct crq_server_adapter *adapter, bool xport_event) | |
1768 | { | |
1769 | int i; | |
1770 | ||
1771 | if (ibmvmc.state != ibmvmc_state_sched_reset) { | |
1772 | dev_info(adapter->dev, "*** Reset to initial state.\n"); | |
1773 | for (i = 0; i < ibmvmc_max_hmcs; i++) | |
1774 | ibmvmc_return_hmc(&hmcs[i], xport_event); | |
1775 | ||
1776 | if (xport_event) { | |
1777 | /* CRQ was closed by the partner. We don't need to do | |
1778 | * anything except set ourself to the correct state to | |
1779 | * handle init msgs. | |
1780 | */ | |
1781 | ibmvmc.state = ibmvmc_state_crqinit; | |
1782 | } else { | |
1783 | /* The partner did not close their CRQ - instead, we're | |
1784 | * closing the CRQ on our end. Need to schedule this | |
1785 | * for process context, because CRQ reset may require a | |
1786 | * sleep. | |
1787 | * | |
1788 | * Setting ibmvmc.state here immediately prevents | |
1789 | * ibmvmc_open from completing until the reset | |
1790 | * completes in process context. | |
1791 | */ | |
1792 | ibmvmc.state = ibmvmc_state_sched_reset; | |
1793 | dev_dbg(adapter->dev, "Device reset scheduled"); | |
1794 | wake_up_interruptible(&adapter->reset_wait_queue); | |
1795 | } | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | /** | |
1800 | * ibmvmc_reset_task - Reset Task | |
1801 | * | |
1802 | * @data: Data field | |
1803 | * | |
1804 | * Performs a CRQ reset of the VMC device in process context. | |
1805 | * NOTE: This function should not be called directly, use ibmvmc_reset. | |
1806 | */ | |
1807 | static int ibmvmc_reset_task(void *data) | |
1808 | { | |
1809 | struct crq_server_adapter *adapter = data; | |
1810 | int rc; | |
1811 | ||
1812 | set_user_nice(current, -20); | |
1813 | ||
1814 | while (!kthread_should_stop()) { | |
1815 | wait_event_interruptible(adapter->reset_wait_queue, | |
1816 | (ibmvmc.state == ibmvmc_state_sched_reset) || | |
1817 | kthread_should_stop()); | |
1818 | ||
1819 | if (kthread_should_stop()) | |
1820 | break; | |
1821 | ||
1822 | dev_dbg(adapter->dev, "CRQ resetting in process context"); | |
1823 | tasklet_disable(&adapter->work_task); | |
1824 | ||
1825 | rc = ibmvmc_reset_crq_queue(adapter); | |
1826 | ||
1827 | if (rc != H_SUCCESS && rc != H_RESOURCE) { | |
1828 | dev_err(adapter->dev, "Error initializing CRQ. rc = 0x%x\n", | |
1829 | rc); | |
1830 | ibmvmc.state = ibmvmc_state_failed; | |
1831 | } else { | |
1832 | ibmvmc.state = ibmvmc_state_crqinit; | |
1833 | ||
1834 | if (ibmvmc_send_crq(adapter, 0xC001000000000000LL, 0) | |
1835 | != 0 && rc != H_RESOURCE) | |
1836 | dev_warn(adapter->dev, "Failed to send initialize CRQ message\n"); | |
1837 | } | |
1838 | ||
1839 | vio_enable_interrupts(to_vio_dev(adapter->dev)); | |
1840 | tasklet_enable(&adapter->work_task); | |
1841 | } | |
1842 | ||
1843 | return 0; | |
1844 | } | |
1845 | ||
1846 | /** | |
1847 | * ibmvmc_process_open_resp - Process Open Response | |
1848 | * | |
1849 | * @crq: ibmvmc_crq_msg struct | |
1850 | * @adapter: crq_server_adapter struct | |
1851 | * | |
1852 | * This command is sent by the hypervisor in response to the Interface | |
1853 | * Open message. When this message is received, the indicated buffer is | |
1854 | * again available for management partition use. | |
1855 | */ | |
1856 | static void ibmvmc_process_open_resp(struct ibmvmc_crq_msg *crq, | |
1857 | struct crq_server_adapter *adapter) | |
1858 | { | |
1859 | unsigned char hmc_index; | |
1860 | unsigned short buffer_id; | |
1861 | ||
1862 | hmc_index = crq->hmc_index; | |
1863 | if (hmc_index > ibmvmc.max_hmc_index) { | |
1864 | /* Why would PHYP give an index > max negotiated? */ | |
1865 | ibmvmc_reset(adapter, false); | |
1866 | return; | |
1867 | } | |
1868 | ||
1869 | if (crq->status) { | |
1870 | dev_warn(adapter->dev, "open_resp: failed - status 0x%x\n", | |
1871 | crq->status); | |
1872 | ibmvmc_return_hmc(&hmcs[hmc_index], false); | |
1873 | return; | |
1874 | } | |
1875 | ||
1876 | if (hmcs[hmc_index].state == ibmhmc_state_opening) { | |
1877 | buffer_id = be16_to_cpu(crq->var2.buffer_id); | |
1878 | if (buffer_id >= ibmvmc.max_buffer_pool_size) { | |
1879 | dev_err(adapter->dev, "open_resp: invalid buffer_id = 0x%x\n", | |
1880 | buffer_id); | |
1881 | hmcs[hmc_index].state = ibmhmc_state_failed; | |
1882 | } else { | |
1883 | ibmvmc_free_hmc_buffer(&hmcs[hmc_index], | |
1884 | &hmcs[hmc_index].buffer[buffer_id]); | |
1885 | hmcs[hmc_index].state = ibmhmc_state_ready; | |
1886 | dev_dbg(adapter->dev, "open_resp: set hmc state = ready\n"); | |
1887 | } | |
1888 | } else { | |
1889 | dev_warn(adapter->dev, "open_resp: invalid hmc state (0x%x)\n", | |
1890 | hmcs[hmc_index].state); | |
1891 | } | |
1892 | } | |
1893 | ||
1894 | /** | |
1895 | * ibmvmc_process_close_resp - Process Close Response | |
1896 | * | |
1897 | * @crq: ibmvmc_crq_msg struct | |
1898 | * @adapter: crq_server_adapter struct | |
1899 | * | |
1900 | * This command is sent by the hypervisor in response to the managemant | |
1901 | * application Interface Close message. | |
1902 | * | |
1903 | * If the close fails, simply reset the entire driver as the state of the VMC | |
1904 | * must be in tough shape. | |
1905 | */ | |
1906 | static void ibmvmc_process_close_resp(struct ibmvmc_crq_msg *crq, | |
1907 | struct crq_server_adapter *adapter) | |
1908 | { | |
1909 | unsigned char hmc_index; | |
1910 | ||
1911 | hmc_index = crq->hmc_index; | |
1912 | if (hmc_index > ibmvmc.max_hmc_index) { | |
1913 | ibmvmc_reset(adapter, false); | |
1914 | return; | |
1915 | } | |
1916 | ||
1917 | if (crq->status) { | |
1918 | dev_warn(adapter->dev, "close_resp: failed - status 0x%x\n", | |
1919 | crq->status); | |
1920 | ibmvmc_reset(adapter, false); | |
1921 | return; | |
1922 | } | |
1923 | ||
1924 | ibmvmc_return_hmc(&hmcs[hmc_index], false); | |
1925 | } | |
1926 | ||
1927 | /** | |
1928 | * ibmvmc_crq_process - Process CRQ | |
1929 | * | |
1930 | * @adapter: crq_server_adapter struct | |
1931 | * @crq: ibmvmc_crq_msg struct | |
1932 | * | |
1933 | * Process the CRQ message based upon the type of message received. | |
1934 | * | |
1935 | */ | |
1936 | static void ibmvmc_crq_process(struct crq_server_adapter *adapter, | |
1937 | struct ibmvmc_crq_msg *crq) | |
1938 | { | |
1939 | switch (crq->type) { | |
1940 | case VMC_MSG_CAP_RESP: | |
1941 | dev_dbg(adapter->dev, "CRQ recv: capabilities resp (0x%x)\n", | |
1942 | crq->type); | |
1943 | if (ibmvmc.state == ibmvmc_state_capabilities) | |
1944 | ibmvmc_process_capabilities(adapter, crq); | |
1945 | else | |
1946 | dev_warn(adapter->dev, "caps msg invalid in state 0x%x\n", | |
1947 | ibmvmc.state); | |
1948 | break; | |
1949 | case VMC_MSG_OPEN_RESP: | |
1950 | dev_dbg(adapter->dev, "CRQ recv: open resp (0x%x)\n", | |
1951 | crq->type); | |
1952 | if (ibmvmc_validate_hmc_session(adapter, crq) == 0) | |
1953 | ibmvmc_process_open_resp(crq, adapter); | |
1954 | break; | |
1955 | case VMC_MSG_ADD_BUF: | |
1956 | dev_dbg(adapter->dev, "CRQ recv: add buf (0x%x)\n", | |
1957 | crq->type); | |
1958 | if (ibmvmc_validate_hmc_session(adapter, crq) == 0) | |
1959 | ibmvmc_add_buffer(adapter, crq); | |
1960 | break; | |
1961 | case VMC_MSG_REM_BUF: | |
1962 | dev_dbg(adapter->dev, "CRQ recv: rem buf (0x%x)\n", | |
1963 | crq->type); | |
1964 | if (ibmvmc_validate_hmc_session(adapter, crq) == 0) | |
1965 | ibmvmc_rem_buffer(adapter, crq); | |
1966 | break; | |
1967 | case VMC_MSG_SIGNAL: | |
1968 | dev_dbg(adapter->dev, "CRQ recv: signal msg (0x%x)\n", | |
1969 | crq->type); | |
1970 | if (ibmvmc_validate_hmc_session(adapter, crq) == 0) | |
1971 | ibmvmc_recv_msg(adapter, crq); | |
1972 | break; | |
1973 | case VMC_MSG_CLOSE_RESP: | |
1974 | dev_dbg(adapter->dev, "CRQ recv: close resp (0x%x)\n", | |
1975 | crq->type); | |
1976 | if (ibmvmc_validate_hmc_session(adapter, crq) == 0) | |
1977 | ibmvmc_process_close_resp(crq, adapter); | |
1978 | break; | |
1979 | case VMC_MSG_CAP: | |
1980 | case VMC_MSG_OPEN: | |
1981 | case VMC_MSG_CLOSE: | |
1982 | case VMC_MSG_ADD_BUF_RESP: | |
1983 | case VMC_MSG_REM_BUF_RESP: | |
1984 | dev_warn(adapter->dev, "CRQ recv: unexpected msg (0x%x)\n", | |
1985 | crq->type); | |
1986 | break; | |
1987 | default: | |
1988 | dev_warn(adapter->dev, "CRQ recv: unknown msg (0x%x)\n", | |
1989 | crq->type); | |
1990 | break; | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | /** | |
1995 | * ibmvmc_handle_crq_init - Handle CRQ Init | |
1996 | * | |
1997 | * @crq: ibmvmc_crq_msg struct | |
1998 | * @adapter: crq_server_adapter struct | |
1999 | * | |
2000 | * Handle the type of crq initialization based on whether | |
2001 | * it is a message or a response. | |
2002 | * | |
2003 | */ | |
2004 | static void ibmvmc_handle_crq_init(struct ibmvmc_crq_msg *crq, | |
2005 | struct crq_server_adapter *adapter) | |
2006 | { | |
2007 | switch (crq->type) { | |
2008 | case 0x01: /* Initialization message */ | |
2009 | dev_dbg(adapter->dev, "CRQ recv: CRQ init msg - state 0x%x\n", | |
2010 | ibmvmc.state); | |
2011 | if (ibmvmc.state == ibmvmc_state_crqinit) { | |
2012 | /* Send back a response */ | |
2013 | if (ibmvmc_send_crq(adapter, 0xC002000000000000, | |
2014 | 0) == 0) | |
2015 | ibmvmc_send_capabilities(adapter); | |
2016 | else | |
2017 | dev_err(adapter->dev, " Unable to send init rsp\n"); | |
2018 | } else { | |
2019 | dev_err(adapter->dev, "Invalid state 0x%x mtu = 0x%x\n", | |
2020 | ibmvmc.state, ibmvmc.max_mtu); | |
2021 | } | |
2022 | ||
2023 | break; | |
2024 | case 0x02: /* Initialization response */ | |
2025 | dev_dbg(adapter->dev, "CRQ recv: initialization resp msg - state 0x%x\n", | |
2026 | ibmvmc.state); | |
2027 | if (ibmvmc.state == ibmvmc_state_crqinit) | |
2028 | ibmvmc_send_capabilities(adapter); | |
2029 | break; | |
2030 | default: | |
2031 | dev_warn(adapter->dev, "Unknown crq message type 0x%lx\n", | |
2032 | (unsigned long)crq->type); | |
2033 | } | |
2034 | } | |
2035 | ||
2036 | /** | |
2037 | * ibmvmc_handle_crq - Handle CRQ | |
2038 | * | |
2039 | * @crq: ibmvmc_crq_msg struct | |
2040 | * @adapter: crq_server_adapter struct | |
2041 | * | |
2042 | * Read the command elements from the command queue and execute the | |
2043 | * requests based upon the type of crq message. | |
2044 | * | |
2045 | */ | |
2046 | static void ibmvmc_handle_crq(struct ibmvmc_crq_msg *crq, | |
2047 | struct crq_server_adapter *adapter) | |
2048 | { | |
2049 | switch (crq->valid) { | |
2050 | case 0xC0: /* initialization */ | |
2051 | ibmvmc_handle_crq_init(crq, adapter); | |
2052 | break; | |
2053 | case 0xFF: /* Hypervisor telling us the connection is closed */ | |
2054 | dev_warn(adapter->dev, "CRQ recv: virtual adapter failed - resetting.\n"); | |
2055 | ibmvmc_reset(adapter, true); | |
2056 | break; | |
2057 | case 0x80: /* real payload */ | |
2058 | ibmvmc_crq_process(adapter, crq); | |
2059 | break; | |
2060 | default: | |
2061 | dev_warn(adapter->dev, "CRQ recv: unknown msg 0x%02x.\n", | |
2062 | crq->valid); | |
2063 | break; | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | static void ibmvmc_task(unsigned long data) | |
2068 | { | |
2069 | struct crq_server_adapter *adapter = | |
2070 | (struct crq_server_adapter *)data; | |
2071 | struct vio_dev *vdev = to_vio_dev(adapter->dev); | |
2072 | struct ibmvmc_crq_msg *crq; | |
2073 | int done = 0; | |
2074 | ||
2075 | while (!done) { | |
2076 | /* Pull all the valid messages off the CRQ */ | |
2077 | while ((crq = crq_queue_next_crq(&adapter->queue)) != NULL) { | |
2078 | ibmvmc_handle_crq(crq, adapter); | |
2079 | crq->valid = 0x00; | |
2080 | /* CRQ reset was requested, stop processing CRQs. | |
2081 | * Interrupts will be re-enabled by the reset task. | |
2082 | */ | |
2083 | if (ibmvmc.state == ibmvmc_state_sched_reset) | |
2084 | return; | |
2085 | } | |
2086 | ||
2087 | vio_enable_interrupts(vdev); | |
2088 | crq = crq_queue_next_crq(&adapter->queue); | |
2089 | if (crq) { | |
2090 | vio_disable_interrupts(vdev); | |
2091 | ibmvmc_handle_crq(crq, adapter); | |
2092 | crq->valid = 0x00; | |
2093 | /* CRQ reset was requested, stop processing CRQs. | |
2094 | * Interrupts will be re-enabled by the reset task. | |
2095 | */ | |
2096 | if (ibmvmc.state == ibmvmc_state_sched_reset) | |
2097 | return; | |
2098 | } else { | |
2099 | done = 1; | |
2100 | } | |
2101 | } | |
2102 | } | |
2103 | ||
2104 | /** | |
2105 | * ibmvmc_init_crq_queue - Init CRQ Queue | |
2106 | * | |
2107 | * @adapter: crq_server_adapter struct | |
2108 | * | |
2109 | * Return: | |
2110 | * 0 - Success | |
2111 | * Non-zero - Failure | |
2112 | */ | |
2113 | static int ibmvmc_init_crq_queue(struct crq_server_adapter *adapter) | |
2114 | { | |
2115 | struct vio_dev *vdev = to_vio_dev(adapter->dev); | |
2116 | struct crq_queue *queue = &adapter->queue; | |
2117 | int rc = 0; | |
2118 | int retrc = 0; | |
2119 | ||
2120 | queue->msgs = (struct ibmvmc_crq_msg *)get_zeroed_page(GFP_KERNEL); | |
2121 | ||
2122 | if (!queue->msgs) | |
2123 | goto malloc_failed; | |
2124 | ||
2125 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
2126 | ||
2127 | queue->msg_token = dma_map_single(adapter->dev, queue->msgs, | |
2128 | queue->size * sizeof(*queue->msgs), | |
2129 | DMA_BIDIRECTIONAL); | |
2130 | ||
2131 | if (dma_mapping_error(adapter->dev, queue->msg_token)) | |
2132 | goto map_failed; | |
2133 | ||
2134 | retrc = plpar_hcall_norets(H_REG_CRQ, | |
2135 | vdev->unit_address, | |
2136 | queue->msg_token, PAGE_SIZE); | |
c55e9318 | 2137 | rc = retrc; |
0eca353e BL |
2138 | |
2139 | if (rc == H_RESOURCE) | |
2140 | rc = ibmvmc_reset_crq_queue(adapter); | |
2141 | ||
2142 | if (rc == 2) { | |
2143 | dev_warn(adapter->dev, "Partner adapter not ready\n"); | |
2144 | retrc = 0; | |
2145 | } else if (rc != 0) { | |
2146 | dev_err(adapter->dev, "Error %d opening adapter\n", rc); | |
2147 | goto reg_crq_failed; | |
2148 | } | |
2149 | ||
2150 | queue->cur = 0; | |
2151 | spin_lock_init(&queue->lock); | |
2152 | ||
2153 | tasklet_init(&adapter->work_task, ibmvmc_task, (unsigned long)adapter); | |
2154 | ||
2155 | if (request_irq(vdev->irq, | |
2156 | ibmvmc_handle_event, | |
2157 | 0, "ibmvmc", (void *)adapter) != 0) { | |
2158 | dev_err(adapter->dev, "couldn't register irq 0x%x\n", | |
2159 | vdev->irq); | |
2160 | goto req_irq_failed; | |
2161 | } | |
2162 | ||
2163 | rc = vio_enable_interrupts(vdev); | |
2164 | if (rc != 0) { | |
2165 | dev_err(adapter->dev, "Error %d enabling interrupts!!!\n", rc); | |
2166 | goto req_irq_failed; | |
2167 | } | |
2168 | ||
2169 | return retrc; | |
2170 | ||
2171 | req_irq_failed: | |
2172 | /* Cannot have any work since we either never got our IRQ registered, | |
2173 | * or never got interrupts enabled | |
2174 | */ | |
2175 | tasklet_kill(&adapter->work_task); | |
2176 | h_free_crq(vdev->unit_address); | |
2177 | reg_crq_failed: | |
2178 | dma_unmap_single(adapter->dev, | |
2179 | queue->msg_token, | |
2180 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
2181 | map_failed: | |
2182 | free_page((unsigned long)queue->msgs); | |
2183 | malloc_failed: | |
2184 | return -ENOMEM; | |
2185 | } | |
2186 | ||
2187 | /* Fill in the liobn and riobn fields on the adapter */ | |
2188 | static int read_dma_window(struct vio_dev *vdev, | |
2189 | struct crq_server_adapter *adapter) | |
2190 | { | |
2191 | const __be32 *dma_window; | |
2192 | const __be32 *prop; | |
2193 | ||
2194 | /* TODO Using of_parse_dma_window would be better, but it doesn't give | |
2195 | * a way to read multiple windows without already knowing the size of | |
2196 | * a window or the number of windows | |
2197 | */ | |
2198 | dma_window = | |
2199 | (const __be32 *)vio_get_attribute(vdev, "ibm,my-dma-window", | |
2200 | NULL); | |
2201 | if (!dma_window) { | |
2202 | dev_warn(adapter->dev, "Couldn't find ibm,my-dma-window property\n"); | |
2203 | return -1; | |
2204 | } | |
2205 | ||
2206 | adapter->liobn = be32_to_cpu(*dma_window); | |
2207 | dma_window++; | |
2208 | ||
2209 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells", | |
2210 | NULL); | |
2211 | if (!prop) { | |
2212 | dev_warn(adapter->dev, "Couldn't find ibm,#dma-address-cells property\n"); | |
2213 | dma_window++; | |
2214 | } else { | |
2215 | dma_window += be32_to_cpu(*prop); | |
2216 | } | |
2217 | ||
2218 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells", | |
2219 | NULL); | |
2220 | if (!prop) { | |
2221 | dev_warn(adapter->dev, "Couldn't find ibm,#dma-size-cells property\n"); | |
2222 | dma_window++; | |
2223 | } else { | |
2224 | dma_window += be32_to_cpu(*prop); | |
2225 | } | |
2226 | ||
2227 | /* dma_window should point to the second window now */ | |
2228 | adapter->riobn = be32_to_cpu(*dma_window); | |
2229 | ||
2230 | return 0; | |
2231 | } | |
2232 | ||
2233 | static int ibmvmc_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
2234 | { | |
2235 | struct crq_server_adapter *adapter = &ibmvmc_adapter; | |
2236 | int rc; | |
2237 | ||
2238 | dev_set_drvdata(&vdev->dev, NULL); | |
2239 | memset(adapter, 0, sizeof(*adapter)); | |
2240 | adapter->dev = &vdev->dev; | |
2241 | ||
2242 | dev_info(adapter->dev, "Probe for UA 0x%x\n", vdev->unit_address); | |
2243 | ||
2244 | rc = read_dma_window(vdev, adapter); | |
2245 | if (rc != 0) { | |
2246 | ibmvmc.state = ibmvmc_state_failed; | |
2247 | return -1; | |
2248 | } | |
2249 | ||
2250 | dev_dbg(adapter->dev, "Probe: liobn 0x%x, riobn 0x%x\n", | |
2251 | adapter->liobn, adapter->riobn); | |
2252 | ||
2253 | init_waitqueue_head(&adapter->reset_wait_queue); | |
2254 | adapter->reset_task = kthread_run(ibmvmc_reset_task, adapter, "ibmvmc"); | |
2255 | if (IS_ERR(adapter->reset_task)) { | |
2256 | dev_err(adapter->dev, "Failed to start reset thread\n"); | |
2257 | ibmvmc.state = ibmvmc_state_failed; | |
2258 | rc = PTR_ERR(adapter->reset_task); | |
2259 | adapter->reset_task = NULL; | |
2260 | return rc; | |
2261 | } | |
2262 | ||
2263 | rc = ibmvmc_init_crq_queue(adapter); | |
2264 | if (rc != 0 && rc != H_RESOURCE) { | |
2265 | dev_err(adapter->dev, "Error initializing CRQ. rc = 0x%x\n", | |
2266 | rc); | |
2267 | ibmvmc.state = ibmvmc_state_failed; | |
2268 | goto crq_failed; | |
2269 | } | |
2270 | ||
2271 | ibmvmc.state = ibmvmc_state_crqinit; | |
2272 | ||
2273 | /* Try to send an initialization message. Note that this is allowed | |
2274 | * to fail if the other end is not acive. In that case we just wait | |
2275 | * for the other side to initialize. | |
2276 | */ | |
2277 | if (ibmvmc_send_crq(adapter, 0xC001000000000000LL, 0) != 0 && | |
2278 | rc != H_RESOURCE) | |
2279 | dev_warn(adapter->dev, "Failed to send initialize CRQ message\n"); | |
2280 | ||
2281 | dev_set_drvdata(&vdev->dev, adapter); | |
2282 | ||
2283 | return 0; | |
2284 | ||
2285 | crq_failed: | |
2286 | kthread_stop(adapter->reset_task); | |
2287 | adapter->reset_task = NULL; | |
2288 | return -EPERM; | |
2289 | } | |
2290 | ||
2291 | static int ibmvmc_remove(struct vio_dev *vdev) | |
2292 | { | |
2293 | struct crq_server_adapter *adapter = dev_get_drvdata(&vdev->dev); | |
2294 | ||
2295 | dev_info(adapter->dev, "Entering remove for UA 0x%x\n", | |
2296 | vdev->unit_address); | |
2297 | ibmvmc_release_crq_queue(adapter); | |
2298 | ||
2299 | return 0; | |
2300 | } | |
2301 | ||
2302 | static struct vio_device_id ibmvmc_device_table[] = { | |
2303 | { "ibm,vmc", "IBM,vmc" }, | |
2304 | { "", "" } | |
2305 | }; | |
2306 | MODULE_DEVICE_TABLE(vio, ibmvmc_device_table); | |
2307 | ||
2308 | static struct vio_driver ibmvmc_driver = { | |
2309 | .name = ibmvmc_driver_name, | |
2310 | .id_table = ibmvmc_device_table, | |
2311 | .probe = ibmvmc_probe, | |
2312 | .remove = ibmvmc_remove, | |
2313 | }; | |
2314 | ||
2315 | static void __init ibmvmc_scrub_module_parms(void) | |
2316 | { | |
2317 | if (ibmvmc_max_mtu > MAX_MTU) { | |
2318 | pr_warn("ibmvmc: Max MTU reduced to %d\n", MAX_MTU); | |
2319 | ibmvmc_max_mtu = MAX_MTU; | |
2320 | } else if (ibmvmc_max_mtu < MIN_MTU) { | |
2321 | pr_warn("ibmvmc: Max MTU increased to %d\n", MIN_MTU); | |
2322 | ibmvmc_max_mtu = MIN_MTU; | |
2323 | } | |
2324 | ||
2325 | if (ibmvmc_max_buf_pool_size > MAX_BUF_POOL_SIZE) { | |
2326 | pr_warn("ibmvmc: Max buffer pool size reduced to %d\n", | |
2327 | MAX_BUF_POOL_SIZE); | |
2328 | ibmvmc_max_buf_pool_size = MAX_BUF_POOL_SIZE; | |
2329 | } else if (ibmvmc_max_buf_pool_size < MIN_BUF_POOL_SIZE) { | |
2330 | pr_warn("ibmvmc: Max buffer pool size increased to %d\n", | |
2331 | MIN_BUF_POOL_SIZE); | |
2332 | ibmvmc_max_buf_pool_size = MIN_BUF_POOL_SIZE; | |
2333 | } | |
2334 | ||
2335 | if (ibmvmc_max_hmcs > MAX_HMCS) { | |
2336 | pr_warn("ibmvmc: Max HMCs reduced to %d\n", MAX_HMCS); | |
2337 | ibmvmc_max_hmcs = MAX_HMCS; | |
2338 | } else if (ibmvmc_max_hmcs < MIN_HMCS) { | |
2339 | pr_warn("ibmvmc: Max HMCs increased to %d\n", MIN_HMCS); | |
2340 | ibmvmc_max_hmcs = MIN_HMCS; | |
2341 | } | |
2342 | } | |
2343 | ||
2344 | static struct miscdevice ibmvmc_miscdev = { | |
2345 | .name = ibmvmc_driver_name, | |
2346 | .minor = MISC_DYNAMIC_MINOR, | |
2347 | .fops = &ibmvmc_fops, | |
2348 | }; | |
2349 | ||
2350 | static int __init ibmvmc_module_init(void) | |
2351 | { | |
2352 | int rc, i, j; | |
2353 | ||
2354 | ibmvmc.state = ibmvmc_state_initial; | |
2355 | pr_info("ibmvmc: version %s\n", IBMVMC_DRIVER_VERSION); | |
2356 | ||
2357 | rc = misc_register(&ibmvmc_miscdev); | |
2358 | if (rc) { | |
2359 | pr_err("ibmvmc: misc registration failed\n"); | |
2360 | goto misc_register_failed; | |
2361 | } | |
2362 | pr_info("ibmvmc: node %d:%d\n", MISC_MAJOR, | |
2363 | ibmvmc_miscdev.minor); | |
2364 | ||
2365 | /* Initialize data structures */ | |
2366 | memset(hmcs, 0, sizeof(struct ibmvmc_hmc) * MAX_HMCS); | |
2367 | for (i = 0; i < MAX_HMCS; i++) { | |
2368 | spin_lock_init(&hmcs[i].lock); | |
2369 | hmcs[i].state = ibmhmc_state_free; | |
2370 | for (j = 0; j < MAX_BUF_POOL_SIZE; j++) | |
2371 | hmcs[i].queue_outbound_msgs[j] = VMC_INVALID_BUFFER_ID; | |
2372 | } | |
2373 | ||
2374 | /* Sanity check module parms */ | |
2375 | ibmvmc_scrub_module_parms(); | |
2376 | ||
2377 | /* | |
2378 | * Initialize some reasonable values. Might be negotiated smaller | |
2379 | * values during the capabilities exchange. | |
2380 | */ | |
2381 | ibmvmc.max_mtu = ibmvmc_max_mtu; | |
2382 | ibmvmc.max_buffer_pool_size = ibmvmc_max_buf_pool_size; | |
2383 | ibmvmc.max_hmc_index = ibmvmc_max_hmcs - 1; | |
2384 | ||
2385 | rc = vio_register_driver(&ibmvmc_driver); | |
2386 | ||
2387 | if (rc) { | |
2388 | pr_err("ibmvmc: rc %d from vio_register_driver\n", rc); | |
2389 | goto vio_reg_failed; | |
2390 | } | |
2391 | ||
2392 | return 0; | |
2393 | ||
2394 | vio_reg_failed: | |
2395 | misc_deregister(&ibmvmc_miscdev); | |
2396 | misc_register_failed: | |
2397 | return rc; | |
2398 | } | |
2399 | ||
2400 | static void __exit ibmvmc_module_exit(void) | |
2401 | { | |
2402 | pr_info("ibmvmc: module exit\n"); | |
2403 | vio_unregister_driver(&ibmvmc_driver); | |
2404 | misc_deregister(&ibmvmc_miscdev); | |
2405 | } | |
2406 | ||
2407 | module_init(ibmvmc_module_init); | |
2408 | module_exit(ibmvmc_module_exit); | |
2409 | ||
2410 | module_param_named(buf_pool_size, ibmvmc_max_buf_pool_size, | |
2411 | int, 0644); | |
2412 | MODULE_PARM_DESC(buf_pool_size, "Buffer pool size"); | |
2413 | module_param_named(max_hmcs, ibmvmc_max_hmcs, int, 0644); | |
2414 | MODULE_PARM_DESC(max_hmcs, "Max HMCs"); | |
2415 | module_param_named(max_mtu, ibmvmc_max_mtu, int, 0644); | |
2416 | MODULE_PARM_DESC(max_mtu, "Max MTU"); | |
2417 | ||
2418 | MODULE_AUTHOR("Steven Royer <seroyer@linux.vnet.ibm.com>"); | |
2419 | MODULE_DESCRIPTION("IBM VMC"); | |
2420 | MODULE_VERSION(IBMVMC_DRIVER_VERSION); | |
2421 | MODULE_LICENSE("GPL v2"); |