]>
Commit | Line | Data |
---|---|---|
f204e0b8 IM |
1 | /* |
2 | * Copyright 2014 IBM Corp. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/spinlock.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/export.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/bitmap.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/poll.h> | |
17 | #include <linux/pid.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/slab.h> | |
21 | #include <asm/cputable.h> | |
22 | #include <asm/current.h> | |
23 | #include <asm/copro.h> | |
24 | ||
25 | #include "cxl.h" | |
9bcf28cd | 26 | #include "trace.h" |
f204e0b8 IM |
27 | |
28 | #define CXL_NUM_MINORS 256 /* Total to reserve */ | |
29 | #define CXL_DEV_MINORS 13 /* 1 control + 4 AFUs * 3 (dedicated/master/shared) */ | |
30 | ||
31 | #define CXL_CARD_MINOR(adapter) (adapter->adapter_num * CXL_DEV_MINORS) | |
32 | #define CXL_AFU_MINOR_D(afu) (CXL_CARD_MINOR(afu->adapter) + 1 + (3 * afu->slice)) | |
33 | #define CXL_AFU_MINOR_M(afu) (CXL_AFU_MINOR_D(afu) + 1) | |
34 | #define CXL_AFU_MINOR_S(afu) (CXL_AFU_MINOR_D(afu) + 2) | |
35 | #define CXL_AFU_MKDEV_D(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_D(afu)) | |
36 | #define CXL_AFU_MKDEV_M(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_M(afu)) | |
37 | #define CXL_AFU_MKDEV_S(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_S(afu)) | |
38 | ||
39 | #define CXL_DEVT_ADAPTER(dev) (MINOR(dev) / CXL_DEV_MINORS) | |
40 | #define CXL_DEVT_AFU(dev) ((MINOR(dev) % CXL_DEV_MINORS - 1) / 3) | |
41 | ||
42 | #define CXL_DEVT_IS_CARD(dev) (MINOR(dev) % CXL_DEV_MINORS == 0) | |
43 | ||
44 | static dev_t cxl_dev; | |
45 | ||
46 | static struct class *cxl_class; | |
47 | ||
48 | static int __afu_open(struct inode *inode, struct file *file, bool master) | |
49 | { | |
50 | struct cxl *adapter; | |
51 | struct cxl_afu *afu; | |
52 | struct cxl_context *ctx; | |
53 | int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev); | |
54 | int slice = CXL_DEVT_AFU(inode->i_rdev); | |
55 | int rc = -ENODEV; | |
56 | ||
57 | pr_devel("afu_open afu%i.%i\n", slice, adapter_num); | |
58 | ||
59 | if (!(adapter = get_cxl_adapter(adapter_num))) | |
60 | return -ENODEV; | |
61 | ||
62 | if (slice > adapter->slices) | |
63 | goto err_put_adapter; | |
64 | ||
65 | spin_lock(&adapter->afu_list_lock); | |
66 | if (!(afu = adapter->afu[slice])) { | |
67 | spin_unlock(&adapter->afu_list_lock); | |
68 | goto err_put_adapter; | |
69 | } | |
1b5df59e VJ |
70 | |
71 | /* | |
72 | * taking a ref to the afu so that it doesn't go away | |
73 | * for rest of the function. This ref is released before | |
74 | * we return. | |
75 | */ | |
76 | cxl_afu_get(afu); | |
f204e0b8 IM |
77 | spin_unlock(&adapter->afu_list_lock); |
78 | ||
79 | if (!afu->current_mode) | |
80 | goto err_put_afu; | |
81 | ||
5be587b1 | 82 | if (!cxl_ops->link_ok(adapter)) { |
0b3f9c75 DA |
83 | rc = -EIO; |
84 | goto err_put_afu; | |
85 | } | |
86 | ||
f204e0b8 IM |
87 | if (!(ctx = cxl_context_alloc())) { |
88 | rc = -ENOMEM; | |
89 | goto err_put_afu; | |
90 | } | |
91 | ||
b123429e | 92 | if ((rc = cxl_context_init(ctx, afu, master, inode->i_mapping))) |
f204e0b8 IM |
93 | goto err_put_afu; |
94 | ||
95 | pr_devel("afu_open pe: %i\n", ctx->pe); | |
96 | file->private_data = ctx; | |
97 | cxl_ctx_get(); | |
98 | ||
1b5df59e VJ |
99 | /* indicate success */ |
100 | rc = 0; | |
f204e0b8 IM |
101 | |
102 | err_put_afu: | |
1b5df59e VJ |
103 | /* release the ref taken earlier */ |
104 | cxl_afu_put(afu); | |
f204e0b8 IM |
105 | err_put_adapter: |
106 | put_device(&adapter->dev); | |
107 | return rc; | |
108 | } | |
0520336a MN |
109 | |
110 | int afu_open(struct inode *inode, struct file *file) | |
f204e0b8 IM |
111 | { |
112 | return __afu_open(inode, file, false); | |
113 | } | |
114 | ||
115 | static int afu_master_open(struct inode *inode, struct file *file) | |
116 | { | |
117 | return __afu_open(inode, file, true); | |
118 | } | |
119 | ||
0520336a | 120 | int afu_release(struct inode *inode, struct file *file) |
f204e0b8 IM |
121 | { |
122 | struct cxl_context *ctx = file->private_data; | |
123 | ||
124 | pr_devel("%s: closing cxl file descriptor. pe: %i\n", | |
125 | __func__, ctx->pe); | |
126 | cxl_context_detach(ctx); | |
127 | ||
5f81b95f AD |
128 | |
129 | /* | |
130 | * Delete the context's mapping pointer, unless it's created by the | |
131 | * kernel API, in which case leave it so it can be freed by reclaim_ctx() | |
132 | */ | |
133 | if (!ctx->kernelapi) { | |
134 | mutex_lock(&ctx->mapping_lock); | |
135 | ctx->mapping = NULL; | |
136 | mutex_unlock(&ctx->mapping_lock); | |
137 | } | |
b123429e | 138 | |
f204e0b8 IM |
139 | /* |
140 | * At this this point all bottom halfs have finished and we should be | |
141 | * getting no more IRQs from the hardware for this context. Once it's | |
142 | * removed from the IDR (and RCU synchronised) it's safe to free the | |
143 | * sstp and context. | |
144 | */ | |
145 | cxl_context_free(ctx); | |
146 | ||
f204e0b8 IM |
147 | return 0; |
148 | } | |
149 | ||
150 | static long afu_ioctl_start_work(struct cxl_context *ctx, | |
151 | struct cxl_ioctl_start_work __user *uwork) | |
152 | { | |
153 | struct cxl_ioctl_start_work work; | |
154 | u64 amr = 0; | |
155 | int rc; | |
156 | ||
157 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); | |
158 | ||
0712dc7e IM |
159 | /* Do this outside the status_mutex to avoid a circular dependency with |
160 | * the locking in cxl_mmap_fault() */ | |
f204e0b8 IM |
161 | if (copy_from_user(&work, uwork, |
162 | sizeof(struct cxl_ioctl_start_work))) { | |
163 | rc = -EFAULT; | |
164 | goto out; | |
165 | } | |
166 | ||
0712dc7e IM |
167 | mutex_lock(&ctx->status_mutex); |
168 | if (ctx->status != OPENED) { | |
169 | rc = -EIO; | |
170 | goto out; | |
171 | } | |
172 | ||
f204e0b8 IM |
173 | /* |
174 | * if any of the reserved fields are set or any of the unused | |
175 | * flags are set it's invalid | |
176 | */ | |
177 | if (work.reserved1 || work.reserved2 || work.reserved3 || | |
178 | work.reserved4 || work.reserved5 || work.reserved6 || | |
179 | (work.flags & ~CXL_START_WORK_ALL)) { | |
180 | rc = -EINVAL; | |
181 | goto out; | |
182 | } | |
183 | ||
184 | if (!(work.flags & CXL_START_WORK_NUM_IRQS)) | |
185 | work.num_interrupts = ctx->afu->pp_irqs; | |
186 | else if ((work.num_interrupts < ctx->afu->pp_irqs) || | |
187 | (work.num_interrupts > ctx->afu->irqs_max)) { | |
188 | rc = -EINVAL; | |
189 | goto out; | |
190 | } | |
191 | if ((rc = afu_register_irqs(ctx, work.num_interrupts))) | |
192 | goto out; | |
193 | ||
194 | if (work.flags & CXL_START_WORK_AMR) | |
195 | amr = work.amr & mfspr(SPRN_UAMOR); | |
196 | ||
d9232a3d IM |
197 | ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF); |
198 | ||
f204e0b8 IM |
199 | /* |
200 | * We grab the PID here and not in the file open to allow for the case | |
201 | * where a process (master, some daemon, etc) has opened the chardev on | |
202 | * behalf of another process, so the AFU's mm gets bound to the process | |
203 | * that performs this ioctl and not the process that opened the file. | |
7b8ad495 VJ |
204 | * Also we grab the PID of the group leader so that if the task that |
205 | * has performed the attach operation exits the mm context of the | |
206 | * process is still accessible. | |
f204e0b8 | 207 | */ |
7b8ad495 VJ |
208 | ctx->pid = get_task_pid(current, PIDTYPE_PID); |
209 | ctx->glpid = get_task_pid(current->group_leader, PIDTYPE_PID); | |
f204e0b8 | 210 | |
9bcf28cd IM |
211 | trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr); |
212 | ||
5be587b1 FB |
213 | if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor, |
214 | amr))) { | |
6428832a | 215 | afu_release_irqs(ctx, ctx); |
f204e0b8 | 216 | goto out; |
456295e2 | 217 | } |
f204e0b8 IM |
218 | |
219 | ctx->status = STARTED; | |
220 | rc = 0; | |
221 | out: | |
222 | mutex_unlock(&ctx->status_mutex); | |
223 | return rc; | |
224 | } | |
5be587b1 | 225 | |
f204e0b8 IM |
226 | static long afu_ioctl_process_element(struct cxl_context *ctx, |
227 | int __user *upe) | |
228 | { | |
229 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); | |
230 | ||
231 | if (copy_to_user(upe, &ctx->pe, sizeof(__u32))) | |
232 | return -EFAULT; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
27d4dc71 VJ |
237 | static long afu_ioctl_get_afu_id(struct cxl_context *ctx, |
238 | struct cxl_afu_id __user *upafuid) | |
239 | { | |
240 | struct cxl_afu_id afuid = { 0 }; | |
241 | ||
242 | afuid.card_id = ctx->afu->adapter->adapter_num; | |
243 | afuid.afu_offset = ctx->afu->slice; | |
244 | afuid.afu_mode = ctx->afu->current_mode; | |
245 | ||
246 | /* set the flag bit in case the afu is a slave */ | |
247 | if (ctx->afu->current_mode == CXL_MODE_DIRECTED && !ctx->master) | |
248 | afuid.flags |= CXL_AFUID_FLAG_SLAVE; | |
249 | ||
250 | if (copy_to_user(upafuid, &afuid, sizeof(afuid))) | |
251 | return -EFAULT; | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
0520336a | 256 | long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
f204e0b8 IM |
257 | { |
258 | struct cxl_context *ctx = file->private_data; | |
259 | ||
260 | if (ctx->status == CLOSED) | |
261 | return -EIO; | |
262 | ||
5be587b1 | 263 | if (!cxl_ops->link_ok(ctx->afu->adapter)) |
0b3f9c75 DA |
264 | return -EIO; |
265 | ||
f204e0b8 IM |
266 | pr_devel("afu_ioctl\n"); |
267 | switch (cmd) { | |
268 | case CXL_IOCTL_START_WORK: | |
269 | return afu_ioctl_start_work(ctx, (struct cxl_ioctl_start_work __user *)arg); | |
270 | case CXL_IOCTL_GET_PROCESS_ELEMENT: | |
271 | return afu_ioctl_process_element(ctx, (__u32 __user *)arg); | |
27d4dc71 VJ |
272 | case CXL_IOCTL_GET_AFU_ID: |
273 | return afu_ioctl_get_afu_id(ctx, (struct cxl_afu_id __user *) | |
274 | arg); | |
f204e0b8 IM |
275 | } |
276 | return -EINVAL; | |
277 | } | |
278 | ||
3d6b040e | 279 | static long afu_compat_ioctl(struct file *file, unsigned int cmd, |
f204e0b8 IM |
280 | unsigned long arg) |
281 | { | |
282 | return afu_ioctl(file, cmd, arg); | |
283 | } | |
284 | ||
0520336a | 285 | int afu_mmap(struct file *file, struct vm_area_struct *vm) |
f204e0b8 IM |
286 | { |
287 | struct cxl_context *ctx = file->private_data; | |
288 | ||
289 | /* AFU must be started before we can MMIO */ | |
290 | if (ctx->status != STARTED) | |
291 | return -EIO; | |
292 | ||
5be587b1 | 293 | if (!cxl_ops->link_ok(ctx->afu->adapter)) |
0b3f9c75 DA |
294 | return -EIO; |
295 | ||
f204e0b8 IM |
296 | return cxl_context_iomap(ctx, vm); |
297 | } | |
298 | ||
0520336a | 299 | unsigned int afu_poll(struct file *file, struct poll_table_struct *poll) |
f204e0b8 IM |
300 | { |
301 | struct cxl_context *ctx = file->private_data; | |
302 | int mask = 0; | |
303 | unsigned long flags; | |
304 | ||
305 | ||
306 | poll_wait(file, &ctx->wq, poll); | |
307 | ||
308 | pr_devel("afu_poll wait done pe: %i\n", ctx->pe); | |
309 | ||
310 | spin_lock_irqsave(&ctx->lock, flags); | |
311 | if (ctx->pending_irq || ctx->pending_fault || | |
312 | ctx->pending_afu_err) | |
313 | mask |= POLLIN | POLLRDNORM; | |
314 | else if (ctx->status == CLOSED) | |
315 | /* Only error on closed when there are no futher events pending | |
316 | */ | |
317 | mask |= POLLERR; | |
318 | spin_unlock_irqrestore(&ctx->lock, flags); | |
319 | ||
320 | pr_devel("afu_poll pe: %i returning %#x\n", ctx->pe, mask); | |
321 | ||
322 | return mask; | |
323 | } | |
324 | ||
325 | static inline int ctx_event_pending(struct cxl_context *ctx) | |
326 | { | |
327 | return (ctx->pending_irq || ctx->pending_fault || | |
328 | ctx->pending_afu_err || (ctx->status == CLOSED)); | |
329 | } | |
330 | ||
0520336a | 331 | ssize_t afu_read(struct file *file, char __user *buf, size_t count, |
f204e0b8 IM |
332 | loff_t *off) |
333 | { | |
334 | struct cxl_context *ctx = file->private_data; | |
335 | struct cxl_event event; | |
336 | unsigned long flags; | |
d53ba6b3 | 337 | int rc; |
f204e0b8 IM |
338 | DEFINE_WAIT(wait); |
339 | ||
5be587b1 | 340 | if (!cxl_ops->link_ok(ctx->afu->adapter)) |
0b3f9c75 DA |
341 | return -EIO; |
342 | ||
f204e0b8 IM |
343 | if (count < CXL_READ_MIN_SIZE) |
344 | return -EINVAL; | |
345 | ||
346 | spin_lock_irqsave(&ctx->lock, flags); | |
347 | ||
348 | for (;;) { | |
349 | prepare_to_wait(&ctx->wq, &wait, TASK_INTERRUPTIBLE); | |
350 | if (ctx_event_pending(ctx)) | |
351 | break; | |
352 | ||
5be587b1 | 353 | if (!cxl_ops->link_ok(ctx->afu->adapter)) { |
0b3f9c75 DA |
354 | rc = -EIO; |
355 | goto out; | |
356 | } | |
357 | ||
d53ba6b3 IM |
358 | if (file->f_flags & O_NONBLOCK) { |
359 | rc = -EAGAIN; | |
360 | goto out; | |
361 | } | |
f204e0b8 | 362 | |
d53ba6b3 IM |
363 | if (signal_pending(current)) { |
364 | rc = -ERESTARTSYS; | |
365 | goto out; | |
366 | } | |
f204e0b8 | 367 | |
d53ba6b3 | 368 | spin_unlock_irqrestore(&ctx->lock, flags); |
f204e0b8 IM |
369 | pr_devel("afu_read going to sleep...\n"); |
370 | schedule(); | |
371 | pr_devel("afu_read woken up\n"); | |
372 | spin_lock_irqsave(&ctx->lock, flags); | |
373 | } | |
374 | ||
375 | finish_wait(&ctx->wq, &wait); | |
376 | ||
377 | memset(&event, 0, sizeof(event)); | |
378 | event.header.process_element = ctx->pe; | |
379 | event.header.size = sizeof(struct cxl_event_header); | |
380 | if (ctx->pending_irq) { | |
381 | pr_devel("afu_read delivering AFU interrupt\n"); | |
382 | event.header.size += sizeof(struct cxl_event_afu_interrupt); | |
383 | event.header.type = CXL_EVENT_AFU_INTERRUPT; | |
384 | event.irq.irq = find_first_bit(ctx->irq_bitmap, ctx->irq_count) + 1; | |
385 | clear_bit(event.irq.irq - 1, ctx->irq_bitmap); | |
386 | if (bitmap_empty(ctx->irq_bitmap, ctx->irq_count)) | |
387 | ctx->pending_irq = false; | |
388 | } else if (ctx->pending_fault) { | |
389 | pr_devel("afu_read delivering data storage fault\n"); | |
390 | event.header.size += sizeof(struct cxl_event_data_storage); | |
391 | event.header.type = CXL_EVENT_DATA_STORAGE; | |
392 | event.fault.addr = ctx->fault_addr; | |
393 | event.fault.dsisr = ctx->fault_dsisr; | |
394 | ctx->pending_fault = false; | |
395 | } else if (ctx->pending_afu_err) { | |
396 | pr_devel("afu_read delivering afu error\n"); | |
397 | event.header.size += sizeof(struct cxl_event_afu_error); | |
398 | event.header.type = CXL_EVENT_AFU_ERROR; | |
399 | event.afu_error.error = ctx->afu_err; | |
400 | ctx->pending_afu_err = false; | |
401 | } else if (ctx->status == CLOSED) { | |
402 | pr_devel("afu_read fatal error\n"); | |
403 | spin_unlock_irqrestore(&ctx->lock, flags); | |
404 | return -EIO; | |
405 | } else | |
406 | WARN(1, "afu_read must be buggy\n"); | |
407 | ||
408 | spin_unlock_irqrestore(&ctx->lock, flags); | |
409 | ||
410 | if (copy_to_user(buf, &event, event.header.size)) | |
411 | return -EFAULT; | |
412 | return event.header.size; | |
d53ba6b3 IM |
413 | |
414 | out: | |
415 | finish_wait(&ctx->wq, &wait); | |
416 | spin_unlock_irqrestore(&ctx->lock, flags); | |
417 | return rc; | |
f204e0b8 IM |
418 | } |
419 | ||
0520336a MN |
420 | /* |
421 | * Note: if this is updated, we need to update api.c to patch the new ones in | |
422 | * too | |
423 | */ | |
424 | const struct file_operations afu_fops = { | |
f204e0b8 IM |
425 | .owner = THIS_MODULE, |
426 | .open = afu_open, | |
427 | .poll = afu_poll, | |
428 | .read = afu_read, | |
429 | .release = afu_release, | |
430 | .unlocked_ioctl = afu_ioctl, | |
431 | .compat_ioctl = afu_compat_ioctl, | |
432 | .mmap = afu_mmap, | |
433 | }; | |
434 | ||
3d6b040e | 435 | static const struct file_operations afu_master_fops = { |
f204e0b8 IM |
436 | .owner = THIS_MODULE, |
437 | .open = afu_master_open, | |
438 | .poll = afu_poll, | |
439 | .read = afu_read, | |
440 | .release = afu_release, | |
441 | .unlocked_ioctl = afu_ioctl, | |
442 | .compat_ioctl = afu_compat_ioctl, | |
443 | .mmap = afu_mmap, | |
444 | }; | |
445 | ||
446 | ||
447 | static char *cxl_devnode(struct device *dev, umode_t *mode) | |
448 | { | |
449 | if (CXL_DEVT_IS_CARD(dev->devt)) { | |
450 | /* | |
451 | * These minor numbers will eventually be used to program the | |
452 | * PSL and AFUs once we have dynamic reprogramming support | |
453 | */ | |
454 | return NULL; | |
455 | } | |
456 | return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev)); | |
457 | } | |
458 | ||
459 | extern struct class *cxl_class; | |
460 | ||
461 | static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev, | |
462 | struct device **chardev, char *postfix, char *desc, | |
463 | const struct file_operations *fops) | |
464 | { | |
465 | struct device *dev; | |
466 | int rc; | |
467 | ||
468 | cdev_init(cdev, fops); | |
469 | if ((rc = cdev_add(cdev, devt, 1))) { | |
470 | dev_err(&afu->dev, "Unable to add %s chardev: %i\n", desc, rc); | |
471 | return rc; | |
472 | } | |
473 | ||
474 | dev = device_create(cxl_class, &afu->dev, devt, afu, | |
475 | "afu%i.%i%s", afu->adapter->adapter_num, afu->slice, postfix); | |
476 | if (IS_ERR(dev)) { | |
477 | dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc); | |
478 | rc = PTR_ERR(dev); | |
479 | goto err; | |
480 | } | |
481 | ||
482 | *chardev = dev; | |
483 | ||
484 | return 0; | |
485 | err: | |
486 | cdev_del(cdev); | |
487 | return rc; | |
488 | } | |
489 | ||
490 | int cxl_chardev_d_afu_add(struct cxl_afu *afu) | |
491 | { | |
492 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_D(afu), &afu->afu_cdev_d, | |
493 | &afu->chardev_d, "d", "dedicated", | |
494 | &afu_master_fops); /* Uses master fops */ | |
495 | } | |
496 | ||
497 | int cxl_chardev_m_afu_add(struct cxl_afu *afu) | |
498 | { | |
499 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_M(afu), &afu->afu_cdev_m, | |
500 | &afu->chardev_m, "m", "master", | |
501 | &afu_master_fops); | |
502 | } | |
503 | ||
504 | int cxl_chardev_s_afu_add(struct cxl_afu *afu) | |
505 | { | |
506 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_S(afu), &afu->afu_cdev_s, | |
507 | &afu->chardev_s, "s", "shared", | |
508 | &afu_fops); | |
509 | } | |
510 | ||
511 | void cxl_chardev_afu_remove(struct cxl_afu *afu) | |
512 | { | |
513 | if (afu->chardev_d) { | |
514 | cdev_del(&afu->afu_cdev_d); | |
515 | device_unregister(afu->chardev_d); | |
516 | afu->chardev_d = NULL; | |
517 | } | |
518 | if (afu->chardev_m) { | |
519 | cdev_del(&afu->afu_cdev_m); | |
520 | device_unregister(afu->chardev_m); | |
521 | afu->chardev_m = NULL; | |
522 | } | |
523 | if (afu->chardev_s) { | |
524 | cdev_del(&afu->afu_cdev_s); | |
525 | device_unregister(afu->chardev_s); | |
526 | afu->chardev_s = NULL; | |
527 | } | |
528 | } | |
529 | ||
530 | int cxl_register_afu(struct cxl_afu *afu) | |
531 | { | |
532 | afu->dev.class = cxl_class; | |
533 | ||
534 | return device_register(&afu->dev); | |
535 | } | |
536 | ||
537 | int cxl_register_adapter(struct cxl *adapter) | |
538 | { | |
539 | adapter->dev.class = cxl_class; | |
540 | ||
541 | /* | |
542 | * Future: When we support dynamically reprogramming the PSL & AFU we | |
543 | * will expose the interface to do that via a chardev: | |
544 | * adapter->dev.devt = CXL_CARD_MKDEV(adapter); | |
545 | */ | |
546 | ||
547 | return device_register(&adapter->dev); | |
548 | } | |
549 | ||
550 | int __init cxl_file_init(void) | |
551 | { | |
552 | int rc; | |
553 | ||
554 | /* | |
555 | * If these change we really need to update API. Either change some | |
556 | * flags or update API version number CXL_API_VERSION. | |
557 | */ | |
d9232a3d | 558 | BUILD_BUG_ON(CXL_API_VERSION != 2); |
f204e0b8 IM |
559 | BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64); |
560 | BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8); | |
561 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8); | |
562 | BUILD_BUG_ON(sizeof(struct cxl_event_data_storage) != 32); | |
563 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_error) != 16); | |
564 | ||
565 | if ((rc = alloc_chrdev_region(&cxl_dev, 0, CXL_NUM_MINORS, "cxl"))) { | |
566 | pr_err("Unable to allocate CXL major number: %i\n", rc); | |
567 | return rc; | |
568 | } | |
569 | ||
570 | pr_devel("CXL device allocated, MAJOR %i\n", MAJOR(cxl_dev)); | |
571 | ||
572 | cxl_class = class_create(THIS_MODULE, "cxl"); | |
573 | if (IS_ERR(cxl_class)) { | |
574 | pr_err("Unable to create CXL class\n"); | |
575 | rc = PTR_ERR(cxl_class); | |
576 | goto err; | |
577 | } | |
578 | cxl_class->devnode = cxl_devnode; | |
579 | ||
580 | return 0; | |
581 | ||
582 | err: | |
583 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); | |
584 | return rc; | |
585 | } | |
586 | ||
587 | void cxl_file_exit(void) | |
588 | { | |
589 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); | |
590 | class_destroy(cxl_class); | |
591 | } |