1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright 2014 IBM Corp. |
4 | */ |
5 | |
6 | #include <linux/spinlock.h> |
7 | #include <linux/module.h> |
8 | #include <linux/export.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/bitmap.h> |
11 | #include <linux/sched/signal.h> |
12 | #include <linux/poll.h> |
13 | #include <linux/pid.h> |
14 | #include <linux/fs.h> |
15 | #include <linux/mm.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/sched/mm.h> |
18 | #include <linux/mmu_context.h> |
19 | #include <asm/cputable.h> |
20 | #include <asm/current.h> |
21 | #include <asm/copro.h> |
22 | |
23 | #include "cxl.h" |
24 | #include "trace.h" |
25 | |
26 | #define CXL_NUM_MINORS 256 /* Total to reserve */ |
27 | |
28 | #define CXL_AFU_MINOR_D(afu) (CXL_CARD_MINOR(afu->adapter) + 1 + (3 * afu->slice)) |
29 | #define CXL_AFU_MINOR_M(afu) (CXL_AFU_MINOR_D(afu) + 1) |
30 | #define CXL_AFU_MINOR_S(afu) (CXL_AFU_MINOR_D(afu) + 2) |
31 | #define CXL_AFU_MKDEV_D(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_D(afu)) |
32 | #define CXL_AFU_MKDEV_M(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_M(afu)) |
33 | #define CXL_AFU_MKDEV_S(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_S(afu)) |
34 | |
35 | #define CXL_DEVT_AFU(dev) ((MINOR(dev) % CXL_DEV_MINORS - 1) / 3) |
36 | |
37 | #define CXL_DEVT_IS_CARD(dev) (MINOR(dev) % CXL_DEV_MINORS == 0) |
38 | |
39 | static dev_t cxl_dev; |
40 | |
41 | static int __afu_open(struct inode *inode, struct file *file, bool master) |
42 | { |
43 | struct cxl *adapter; |
44 | struct cxl_afu *afu; |
45 | struct cxl_context *ctx; |
46 | int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev); |
47 | int slice = CXL_DEVT_AFU(inode->i_rdev); |
48 | int rc = -ENODEV; |
49 | |
50 | pr_devel("afu_open afu%i.%i\n" , slice, adapter_num); |
51 | |
52 | if (!(adapter = get_cxl_adapter(num: adapter_num))) |
53 | return -ENODEV; |
54 | |
55 | if (slice > adapter->slices) |
56 | goto err_put_adapter; |
57 | |
58 | spin_lock(lock: &adapter->afu_list_lock); |
59 | if (!(afu = adapter->afu[slice])) { |
60 | spin_unlock(lock: &adapter->afu_list_lock); |
61 | goto err_put_adapter; |
62 | } |
63 | |
64 | /* |
65 | * taking a ref to the afu so that it doesn't go away |
66 | * for rest of the function. This ref is released before |
67 | * we return. |
68 | */ |
69 | cxl_afu_get(afu); |
70 | spin_unlock(lock: &adapter->afu_list_lock); |
71 | |
72 | if (!afu->current_mode) |
73 | goto err_put_afu; |
74 | |
75 | if (!cxl_ops->link_ok(adapter, afu)) { |
76 | rc = -EIO; |
77 | goto err_put_afu; |
78 | } |
79 | |
80 | if (!(ctx = cxl_context_alloc())) { |
81 | rc = -ENOMEM; |
82 | goto err_put_afu; |
83 | } |
84 | |
85 | rc = cxl_context_init(ctx, afu, master); |
86 | if (rc) |
87 | goto err_put_afu; |
88 | |
89 | cxl_context_set_mapping(ctx, mapping: inode->i_mapping); |
90 | |
91 | pr_devel("afu_open pe: %i\n" , ctx->pe); |
92 | file->private_data = ctx; |
93 | |
94 | /* indicate success */ |
95 | rc = 0; |
96 | |
97 | err_put_afu: |
98 | /* release the ref taken earlier */ |
99 | cxl_afu_put(afu); |
100 | err_put_adapter: |
101 | put_device(dev: &adapter->dev); |
102 | return rc; |
103 | } |
104 | |
105 | int afu_open(struct inode *inode, struct file *file) |
106 | { |
107 | return __afu_open(inode, file, master: false); |
108 | } |
109 | |
110 | static int afu_master_open(struct inode *inode, struct file *file) |
111 | { |
112 | return __afu_open(inode, file, master: true); |
113 | } |
114 | |
115 | int afu_release(struct inode *inode, struct file *file) |
116 | { |
117 | struct cxl_context *ctx = file->private_data; |
118 | |
119 | pr_devel("%s: closing cxl file descriptor. pe: %i\n" , |
120 | __func__, ctx->pe); |
121 | cxl_context_detach(ctx); |
122 | |
123 | |
124 | /* |
125 | * Delete the context's mapping pointer, unless it's created by the |
126 | * kernel API, in which case leave it so it can be freed by reclaim_ctx() |
127 | */ |
128 | if (!ctx->kernelapi) { |
129 | mutex_lock(&ctx->mapping_lock); |
130 | ctx->mapping = NULL; |
131 | mutex_unlock(lock: &ctx->mapping_lock); |
132 | } |
133 | |
134 | /* |
135 | * At this this point all bottom halfs have finished and we should be |
136 | * getting no more IRQs from the hardware for this context. Once it's |
137 | * removed from the IDR (and RCU synchronised) it's safe to free the |
138 | * sstp and context. |
139 | */ |
140 | cxl_context_free(ctx); |
141 | |
142 | return 0; |
143 | } |
144 | |
145 | static long afu_ioctl_start_work(struct cxl_context *ctx, |
146 | struct cxl_ioctl_start_work __user *uwork) |
147 | { |
148 | struct cxl_ioctl_start_work work; |
149 | u64 amr = 0; |
150 | int rc; |
151 | |
152 | pr_devel("%s: pe: %i\n" , __func__, ctx->pe); |
153 | |
154 | /* Do this outside the status_mutex to avoid a circular dependency with |
155 | * the locking in cxl_mmap_fault() */ |
156 | if (copy_from_user(to: &work, from: uwork, n: sizeof(work))) |
157 | return -EFAULT; |
158 | |
159 | mutex_lock(&ctx->status_mutex); |
160 | if (ctx->status != OPENED) { |
161 | rc = -EIO; |
162 | goto out; |
163 | } |
164 | |
165 | /* |
166 | * if any of the reserved fields are set or any of the unused |
167 | * flags are set it's invalid |
168 | */ |
169 | if (work.reserved1 || work.reserved2 || work.reserved3 || |
170 | work.reserved4 || work.reserved5 || |
171 | (work.flags & ~CXL_START_WORK_ALL)) { |
172 | rc = -EINVAL; |
173 | goto out; |
174 | } |
175 | |
176 | if (!(work.flags & CXL_START_WORK_NUM_IRQS)) |
177 | work.num_interrupts = ctx->afu->pp_irqs; |
178 | else if ((work.num_interrupts < ctx->afu->pp_irqs) || |
179 | (work.num_interrupts > ctx->afu->irqs_max)) { |
180 | rc = -EINVAL; |
181 | goto out; |
182 | } |
183 | |
184 | if ((rc = afu_register_irqs(ctx, count: work.num_interrupts))) |
185 | goto out; |
186 | |
187 | if (work.flags & CXL_START_WORK_AMR) |
188 | amr = work.amr & mfspr(SPRN_UAMOR); |
189 | |
190 | if (work.flags & CXL_START_WORK_TID) |
191 | ctx->assign_tidr = true; |
192 | |
193 | ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF); |
194 | |
195 | /* |
196 | * Increment the mapped context count for adapter. This also checks |
197 | * if adapter_context_lock is taken. |
198 | */ |
199 | rc = cxl_adapter_context_get(adapter: ctx->afu->adapter); |
200 | if (rc) { |
201 | afu_release_irqs(ctx, cookie: ctx); |
202 | goto out; |
203 | } |
204 | |
205 | /* |
206 | * We grab the PID here and not in the file open to allow for the case |
207 | * where a process (master, some daemon, etc) has opened the chardev on |
208 | * behalf of another process, so the AFU's mm gets bound to the process |
209 | * that performs this ioctl and not the process that opened the file. |
210 | * Also we grab the PID of the group leader so that if the task that |
211 | * has performed the attach operation exits the mm context of the |
212 | * process is still accessible. |
213 | */ |
214 | ctx->pid = get_task_pid(current, type: PIDTYPE_PID); |
215 | |
216 | /* acquire a reference to the task's mm */ |
217 | ctx->mm = get_task_mm(current); |
218 | |
219 | /* ensure this mm_struct can't be freed */ |
220 | cxl_context_mm_count_get(ctx); |
221 | |
222 | if (ctx->mm) { |
223 | /* decrement the use count from above */ |
224 | mmput(ctx->mm); |
225 | /* make TLBIs for this context global */ |
226 | mm_context_add_copro(ctx->mm); |
227 | } |
228 | |
229 | /* |
230 | * Increment driver use count. Enables global TLBIs for hash |
231 | * and callbacks to handle the segment table |
232 | */ |
233 | cxl_ctx_get(); |
234 | |
235 | /* |
236 | * A barrier is needed to make sure all TLBIs are global |
237 | * before we attach and the context starts being used by the |
238 | * adapter. |
239 | * |
240 | * Needed after mm_context_add_copro() for radix and |
241 | * cxl_ctx_get() for hash/p8. |
242 | * |
243 | * The barrier should really be mb(), since it involves a |
244 | * device. However, it's only useful when we have local |
245 | * vs. global TLBIs, i.e SMP=y. So keep smp_mb(). |
246 | */ |
247 | smp_mb(); |
248 | |
249 | trace_cxl_attach(ctx, wed: work.work_element_descriptor, num_interrupts: work.num_interrupts, amr); |
250 | |
251 | if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor, |
252 | amr))) { |
253 | afu_release_irqs(ctx, cookie: ctx); |
254 | cxl_adapter_context_put(adapter: ctx->afu->adapter); |
255 | put_pid(pid: ctx->pid); |
256 | ctx->pid = NULL; |
257 | cxl_ctx_put(); |
258 | cxl_context_mm_count_put(ctx); |
259 | if (ctx->mm) |
260 | mm_context_remove_copro(ctx->mm); |
261 | goto out; |
262 | } |
263 | |
264 | rc = 0; |
265 | if (work.flags & CXL_START_WORK_TID) { |
266 | work.tid = ctx->tidr; |
267 | if (copy_to_user(to: uwork, from: &work, n: sizeof(work))) |
268 | rc = -EFAULT; |
269 | } |
270 | |
271 | ctx->status = STARTED; |
272 | |
273 | out: |
274 | mutex_unlock(lock: &ctx->status_mutex); |
275 | return rc; |
276 | } |
277 | |
278 | static long afu_ioctl_process_element(struct cxl_context *ctx, |
279 | int __user *upe) |
280 | { |
281 | pr_devel("%s: pe: %i\n" , __func__, ctx->pe); |
282 | |
283 | if (copy_to_user(to: upe, from: &ctx->external_pe, n: sizeof(__u32))) |
284 | return -EFAULT; |
285 | |
286 | return 0; |
287 | } |
288 | |
289 | static long afu_ioctl_get_afu_id(struct cxl_context *ctx, |
290 | struct cxl_afu_id __user *upafuid) |
291 | { |
292 | struct cxl_afu_id afuid = { 0 }; |
293 | |
294 | afuid.card_id = ctx->afu->adapter->adapter_num; |
295 | afuid.afu_offset = ctx->afu->slice; |
296 | afuid.afu_mode = ctx->afu->current_mode; |
297 | |
298 | /* set the flag bit in case the afu is a slave */ |
299 | if (ctx->afu->current_mode == CXL_MODE_DIRECTED && !ctx->master) |
300 | afuid.flags |= CXL_AFUID_FLAG_SLAVE; |
301 | |
302 | if (copy_to_user(to: upafuid, from: &afuid, n: sizeof(afuid))) |
303 | return -EFAULT; |
304 | |
305 | return 0; |
306 | } |
307 | |
308 | long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
309 | { |
310 | struct cxl_context *ctx = file->private_data; |
311 | |
312 | if (ctx->status == CLOSED) |
313 | return -EIO; |
314 | |
315 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
316 | return -EIO; |
317 | |
318 | pr_devel("afu_ioctl\n" ); |
319 | switch (cmd) { |
320 | case CXL_IOCTL_START_WORK: |
321 | return afu_ioctl_start_work(ctx, uwork: (struct cxl_ioctl_start_work __user *)arg); |
322 | case CXL_IOCTL_GET_PROCESS_ELEMENT: |
323 | return afu_ioctl_process_element(ctx, upe: (__u32 __user *)arg); |
324 | case CXL_IOCTL_GET_AFU_ID: |
325 | return afu_ioctl_get_afu_id(ctx, upafuid: (struct cxl_afu_id __user *) |
326 | arg); |
327 | } |
328 | return -EINVAL; |
329 | } |
330 | |
331 | static long afu_compat_ioctl(struct file *file, unsigned int cmd, |
332 | unsigned long arg) |
333 | { |
334 | return afu_ioctl(file, cmd, arg); |
335 | } |
336 | |
337 | int afu_mmap(struct file *file, struct vm_area_struct *vm) |
338 | { |
339 | struct cxl_context *ctx = file->private_data; |
340 | |
341 | /* AFU must be started before we can MMIO */ |
342 | if (ctx->status != STARTED) |
343 | return -EIO; |
344 | |
345 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
346 | return -EIO; |
347 | |
348 | return cxl_context_iomap(ctx, vma: vm); |
349 | } |
350 | |
351 | static inline bool ctx_event_pending(struct cxl_context *ctx) |
352 | { |
353 | if (ctx->pending_irq || ctx->pending_fault || ctx->pending_afu_err) |
354 | return true; |
355 | |
356 | if (ctx->afu_driver_ops && atomic_read(v: &ctx->afu_driver_events)) |
357 | return true; |
358 | |
359 | return false; |
360 | } |
361 | |
362 | __poll_t afu_poll(struct file *file, struct poll_table_struct *poll) |
363 | { |
364 | struct cxl_context *ctx = file->private_data; |
365 | __poll_t mask = 0; |
366 | unsigned long flags; |
367 | |
368 | |
369 | poll_wait(filp: file, wait_address: &ctx->wq, p: poll); |
370 | |
371 | pr_devel("afu_poll wait done pe: %i\n" , ctx->pe); |
372 | |
373 | spin_lock_irqsave(&ctx->lock, flags); |
374 | if (ctx_event_pending(ctx)) |
375 | mask |= EPOLLIN | EPOLLRDNORM; |
376 | else if (ctx->status == CLOSED) |
377 | /* Only error on closed when there are no futher events pending |
378 | */ |
379 | mask |= EPOLLERR; |
380 | spin_unlock_irqrestore(lock: &ctx->lock, flags); |
381 | |
382 | pr_devel("afu_poll pe: %i returning %#x\n" , ctx->pe, mask); |
383 | |
384 | return mask; |
385 | } |
386 | |
387 | static ssize_t afu_driver_event_copy(struct cxl_context *ctx, |
388 | char __user *buf, |
389 | struct cxl_event *event, |
390 | struct cxl_event_afu_driver_reserved *pl) |
391 | { |
392 | /* Check event */ |
393 | if (!pl) { |
394 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL); |
395 | return -EFAULT; |
396 | } |
397 | |
398 | /* Check event size */ |
399 | event->header.size += pl->data_size; |
400 | if (event->header.size > CXL_READ_MIN_SIZE) { |
401 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL); |
402 | return -EFAULT; |
403 | } |
404 | |
405 | /* Copy event header */ |
406 | if (copy_to_user(to: buf, from: event, n: sizeof(struct cxl_event_header))) { |
407 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT); |
408 | return -EFAULT; |
409 | } |
410 | |
411 | /* Copy event data */ |
412 | buf += sizeof(struct cxl_event_header); |
413 | if (copy_to_user(to: buf, from: &pl->data, n: pl->data_size)) { |
414 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT); |
415 | return -EFAULT; |
416 | } |
417 | |
418 | ctx->afu_driver_ops->event_delivered(ctx, pl, 0); /* Success */ |
419 | return event->header.size; |
420 | } |
421 | |
422 | ssize_t afu_read(struct file *file, char __user *buf, size_t count, |
423 | loff_t *off) |
424 | { |
425 | struct cxl_context *ctx = file->private_data; |
426 | struct cxl_event_afu_driver_reserved *pl = NULL; |
427 | struct cxl_event event; |
428 | unsigned long flags; |
429 | int rc; |
430 | DEFINE_WAIT(wait); |
431 | |
432 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
433 | return -EIO; |
434 | |
435 | if (count < CXL_READ_MIN_SIZE) |
436 | return -EINVAL; |
437 | |
438 | spin_lock_irqsave(&ctx->lock, flags); |
439 | |
440 | for (;;) { |
441 | prepare_to_wait(wq_head: &ctx->wq, wq_entry: &wait, TASK_INTERRUPTIBLE); |
442 | if (ctx_event_pending(ctx) || (ctx->status == CLOSED)) |
443 | break; |
444 | |
445 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) { |
446 | rc = -EIO; |
447 | goto out; |
448 | } |
449 | |
450 | if (file->f_flags & O_NONBLOCK) { |
451 | rc = -EAGAIN; |
452 | goto out; |
453 | } |
454 | |
455 | if (signal_pending(current)) { |
456 | rc = -ERESTARTSYS; |
457 | goto out; |
458 | } |
459 | |
460 | spin_unlock_irqrestore(lock: &ctx->lock, flags); |
461 | pr_devel("afu_read going to sleep...\n" ); |
462 | schedule(); |
463 | pr_devel("afu_read woken up\n" ); |
464 | spin_lock_irqsave(&ctx->lock, flags); |
465 | } |
466 | |
467 | finish_wait(wq_head: &ctx->wq, wq_entry: &wait); |
468 | |
469 | memset(s: &event, c: 0, n: sizeof(event)); |
470 | event.header.process_element = ctx->pe; |
471 | event.header.size = sizeof(struct cxl_event_header); |
472 | if (ctx->afu_driver_ops && atomic_read(v: &ctx->afu_driver_events)) { |
473 | pr_devel("afu_read delivering AFU driver specific event\n" ); |
474 | pl = ctx->afu_driver_ops->fetch_event(ctx); |
475 | atomic_dec(v: &ctx->afu_driver_events); |
476 | event.header.type = CXL_EVENT_AFU_DRIVER; |
477 | } else if (ctx->pending_irq) { |
478 | pr_devel("afu_read delivering AFU interrupt\n" ); |
479 | event.header.size += sizeof(struct cxl_event_afu_interrupt); |
480 | event.header.type = CXL_EVENT_AFU_INTERRUPT; |
481 | event.irq.irq = find_first_bit(addr: ctx->irq_bitmap, size: ctx->irq_count) + 1; |
482 | clear_bit(nr: event.irq.irq - 1, addr: ctx->irq_bitmap); |
483 | if (bitmap_empty(src: ctx->irq_bitmap, nbits: ctx->irq_count)) |
484 | ctx->pending_irq = false; |
485 | } else if (ctx->pending_fault) { |
486 | pr_devel("afu_read delivering data storage fault\n" ); |
487 | event.header.size += sizeof(struct cxl_event_data_storage); |
488 | event.header.type = CXL_EVENT_DATA_STORAGE; |
489 | event.fault.addr = ctx->fault_addr; |
490 | event.fault.dsisr = ctx->fault_dsisr; |
491 | ctx->pending_fault = false; |
492 | } else if (ctx->pending_afu_err) { |
493 | pr_devel("afu_read delivering afu error\n" ); |
494 | event.header.size += sizeof(struct cxl_event_afu_error); |
495 | event.header.type = CXL_EVENT_AFU_ERROR; |
496 | event.afu_error.error = ctx->afu_err; |
497 | ctx->pending_afu_err = false; |
498 | } else if (ctx->status == CLOSED) { |
499 | pr_devel("afu_read fatal error\n" ); |
500 | spin_unlock_irqrestore(lock: &ctx->lock, flags); |
501 | return -EIO; |
502 | } else |
503 | WARN(1, "afu_read must be buggy\n" ); |
504 | |
505 | spin_unlock_irqrestore(lock: &ctx->lock, flags); |
506 | |
507 | if (event.header.type == CXL_EVENT_AFU_DRIVER) |
508 | return afu_driver_event_copy(ctx, buf, event: &event, pl); |
509 | |
510 | if (copy_to_user(to: buf, from: &event, n: event.header.size)) |
511 | return -EFAULT; |
512 | return event.header.size; |
513 | |
514 | out: |
515 | finish_wait(wq_head: &ctx->wq, wq_entry: &wait); |
516 | spin_unlock_irqrestore(lock: &ctx->lock, flags); |
517 | return rc; |
518 | } |
519 | |
520 | /* |
521 | * Note: if this is updated, we need to update api.c to patch the new ones in |
522 | * too |
523 | */ |
524 | const struct file_operations afu_fops = { |
525 | .owner = THIS_MODULE, |
526 | .open = afu_open, |
527 | .poll = afu_poll, |
528 | .read = afu_read, |
529 | .release = afu_release, |
530 | .unlocked_ioctl = afu_ioctl, |
531 | .compat_ioctl = afu_compat_ioctl, |
532 | .mmap = afu_mmap, |
533 | }; |
534 | |
535 | static const struct file_operations afu_master_fops = { |
536 | .owner = THIS_MODULE, |
537 | .open = afu_master_open, |
538 | .poll = afu_poll, |
539 | .read = afu_read, |
540 | .release = afu_release, |
541 | .unlocked_ioctl = afu_ioctl, |
542 | .compat_ioctl = afu_compat_ioctl, |
543 | .mmap = afu_mmap, |
544 | }; |
545 | |
546 | |
547 | static char *cxl_devnode(const struct device *dev, umode_t *mode) |
548 | { |
549 | if (cpu_has_feature(CPU_FTR_HVMODE) && |
550 | CXL_DEVT_IS_CARD(dev->devt)) { |
551 | /* |
552 | * These minor numbers will eventually be used to program the |
553 | * PSL and AFUs once we have dynamic reprogramming support |
554 | */ |
555 | return NULL; |
556 | } |
557 | return kasprintf(GFP_KERNEL, fmt: "cxl/%s" , dev_name(dev)); |
558 | } |
559 | |
560 | static const struct class cxl_class = { |
561 | .name = "cxl" , |
562 | .devnode = cxl_devnode, |
563 | }; |
564 | |
565 | static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev, |
566 | struct device **chardev, char *postfix, char *desc, |
567 | const struct file_operations *fops) |
568 | { |
569 | struct device *dev; |
570 | int rc; |
571 | |
572 | cdev_init(cdev, fops); |
573 | rc = cdev_add(cdev, devt, 1); |
574 | if (rc) { |
575 | dev_err(&afu->dev, "Unable to add %s chardev: %i\n" , desc, rc); |
576 | return rc; |
577 | } |
578 | |
579 | dev = device_create(cls: &cxl_class, parent: &afu->dev, devt, drvdata: afu, |
580 | fmt: "afu%i.%i%s" , afu->adapter->adapter_num, afu->slice, postfix); |
581 | if (IS_ERR(ptr: dev)) { |
582 | rc = PTR_ERR(ptr: dev); |
583 | dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n" , desc, rc); |
584 | goto err; |
585 | } |
586 | |
587 | *chardev = dev; |
588 | |
589 | return 0; |
590 | err: |
591 | cdev_del(cdev); |
592 | return rc; |
593 | } |
594 | |
595 | int cxl_chardev_d_afu_add(struct cxl_afu *afu) |
596 | { |
597 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_D(afu), cdev: &afu->afu_cdev_d, |
598 | chardev: &afu->chardev_d, postfix: "d" , desc: "dedicated" , |
599 | fops: &afu_master_fops); /* Uses master fops */ |
600 | } |
601 | |
602 | int cxl_chardev_m_afu_add(struct cxl_afu *afu) |
603 | { |
604 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_M(afu), cdev: &afu->afu_cdev_m, |
605 | chardev: &afu->chardev_m, postfix: "m" , desc: "master" , |
606 | fops: &afu_master_fops); |
607 | } |
608 | |
609 | int cxl_chardev_s_afu_add(struct cxl_afu *afu) |
610 | { |
611 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_S(afu), cdev: &afu->afu_cdev_s, |
612 | chardev: &afu->chardev_s, postfix: "s" , desc: "shared" , |
613 | fops: &afu_fops); |
614 | } |
615 | |
616 | void cxl_chardev_afu_remove(struct cxl_afu *afu) |
617 | { |
618 | if (afu->chardev_d) { |
619 | cdev_del(&afu->afu_cdev_d); |
620 | device_unregister(dev: afu->chardev_d); |
621 | afu->chardev_d = NULL; |
622 | } |
623 | if (afu->chardev_m) { |
624 | cdev_del(&afu->afu_cdev_m); |
625 | device_unregister(dev: afu->chardev_m); |
626 | afu->chardev_m = NULL; |
627 | } |
628 | if (afu->chardev_s) { |
629 | cdev_del(&afu->afu_cdev_s); |
630 | device_unregister(dev: afu->chardev_s); |
631 | afu->chardev_s = NULL; |
632 | } |
633 | } |
634 | |
635 | int cxl_register_afu(struct cxl_afu *afu) |
636 | { |
637 | afu->dev.class = &cxl_class; |
638 | |
639 | return device_register(dev: &afu->dev); |
640 | } |
641 | |
642 | int cxl_register_adapter(struct cxl *adapter) |
643 | { |
644 | adapter->dev.class = &cxl_class; |
645 | |
646 | /* |
647 | * Future: When we support dynamically reprogramming the PSL & AFU we |
648 | * will expose the interface to do that via a chardev: |
649 | * adapter->dev.devt = CXL_CARD_MKDEV(adapter); |
650 | */ |
651 | |
652 | return device_register(dev: &adapter->dev); |
653 | } |
654 | |
655 | dev_t cxl_get_dev(void) |
656 | { |
657 | return cxl_dev; |
658 | } |
659 | |
660 | int __init cxl_file_init(void) |
661 | { |
662 | int rc; |
663 | |
664 | /* |
665 | * If these change we really need to update API. Either change some |
666 | * flags or update API version number CXL_API_VERSION. |
667 | */ |
668 | BUILD_BUG_ON(CXL_API_VERSION != 3); |
669 | BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64); |
670 | BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8); |
671 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8); |
672 | BUILD_BUG_ON(sizeof(struct cxl_event_data_storage) != 32); |
673 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_error) != 16); |
674 | |
675 | if ((rc = alloc_chrdev_region(&cxl_dev, 0, CXL_NUM_MINORS, "cxl" ))) { |
676 | pr_err("Unable to allocate CXL major number: %i\n" , rc); |
677 | return rc; |
678 | } |
679 | |
680 | pr_devel("CXL device allocated, MAJOR %i\n" , MAJOR(cxl_dev)); |
681 | |
682 | rc = class_register(class: &cxl_class); |
683 | if (rc) { |
684 | pr_err("Unable to create CXL class\n" ); |
685 | goto err; |
686 | } |
687 | |
688 | return 0; |
689 | |
690 | err: |
691 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); |
692 | return rc; |
693 | } |
694 | |
695 | void cxl_file_exit(void) |
696 | { |
697 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); |
698 | class_unregister(class: &cxl_class); |
699 | } |
700 | |