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 */ | |
f204e0b8 | 29 | |
f204e0b8 IM |
30 | #define CXL_AFU_MINOR_D(afu) (CXL_CARD_MINOR(afu->adapter) + 1 + (3 * afu->slice)) |
31 | #define CXL_AFU_MINOR_M(afu) (CXL_AFU_MINOR_D(afu) + 1) | |
32 | #define CXL_AFU_MINOR_S(afu) (CXL_AFU_MINOR_D(afu) + 2) | |
33 | #define CXL_AFU_MKDEV_D(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_D(afu)) | |
34 | #define CXL_AFU_MKDEV_M(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_M(afu)) | |
35 | #define CXL_AFU_MKDEV_S(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_S(afu)) | |
36 | ||
f204e0b8 IM |
37 | #define CXL_DEVT_AFU(dev) ((MINOR(dev) % CXL_DEV_MINORS - 1) / 3) |
38 | ||
39 | #define CXL_DEVT_IS_CARD(dev) (MINOR(dev) % CXL_DEV_MINORS == 0) | |
40 | ||
41 | static dev_t cxl_dev; | |
42 | ||
43 | static struct class *cxl_class; | |
44 | ||
45 | static int __afu_open(struct inode *inode, struct file *file, bool master) | |
46 | { | |
47 | struct cxl *adapter; | |
48 | struct cxl_afu *afu; | |
49 | struct cxl_context *ctx; | |
50 | int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev); | |
51 | int slice = CXL_DEVT_AFU(inode->i_rdev); | |
52 | int rc = -ENODEV; | |
53 | ||
54 | pr_devel("afu_open afu%i.%i\n", slice, adapter_num); | |
55 | ||
56 | if (!(adapter = get_cxl_adapter(adapter_num))) | |
57 | return -ENODEV; | |
58 | ||
59 | if (slice > adapter->slices) | |
60 | goto err_put_adapter; | |
61 | ||
62 | spin_lock(&adapter->afu_list_lock); | |
63 | if (!(afu = adapter->afu[slice])) { | |
64 | spin_unlock(&adapter->afu_list_lock); | |
65 | goto err_put_adapter; | |
66 | } | |
1b5df59e VJ |
67 | |
68 | /* | |
69 | * taking a ref to the afu so that it doesn't go away | |
70 | * for rest of the function. This ref is released before | |
71 | * we return. | |
72 | */ | |
73 | cxl_afu_get(afu); | |
f204e0b8 IM |
74 | spin_unlock(&adapter->afu_list_lock); |
75 | ||
76 | if (!afu->current_mode) | |
77 | goto err_put_afu; | |
78 | ||
0d400f77 | 79 | if (!cxl_ops->link_ok(adapter, afu)) { |
0b3f9c75 DA |
80 | rc = -EIO; |
81 | goto err_put_afu; | |
82 | } | |
83 | ||
f204e0b8 IM |
84 | if (!(ctx = cxl_context_alloc())) { |
85 | rc = -ENOMEM; | |
86 | goto err_put_afu; | |
87 | } | |
88 | ||
b123429e | 89 | if ((rc = cxl_context_init(ctx, afu, master, inode->i_mapping))) |
f204e0b8 IM |
90 | goto err_put_afu; |
91 | ||
92 | pr_devel("afu_open pe: %i\n", ctx->pe); | |
93 | file->private_data = ctx; | |
94 | cxl_ctx_get(); | |
95 | ||
1b5df59e VJ |
96 | /* indicate success */ |
97 | rc = 0; | |
f204e0b8 IM |
98 | |
99 | err_put_afu: | |
1b5df59e VJ |
100 | /* release the ref taken earlier */ |
101 | cxl_afu_put(afu); | |
f204e0b8 IM |
102 | err_put_adapter: |
103 | put_device(&adapter->dev); | |
104 | return rc; | |
105 | } | |
0520336a MN |
106 | |
107 | int afu_open(struct inode *inode, struct file *file) | |
f204e0b8 IM |
108 | { |
109 | return __afu_open(inode, file, false); | |
110 | } | |
111 | ||
112 | static int afu_master_open(struct inode *inode, struct file *file) | |
113 | { | |
114 | return __afu_open(inode, file, true); | |
115 | } | |
116 | ||
0520336a | 117 | int afu_release(struct inode *inode, struct file *file) |
f204e0b8 IM |
118 | { |
119 | struct cxl_context *ctx = file->private_data; | |
120 | ||
121 | pr_devel("%s: closing cxl file descriptor. pe: %i\n", | |
122 | __func__, ctx->pe); | |
123 | cxl_context_detach(ctx); | |
124 | ||
5f81b95f AD |
125 | |
126 | /* | |
127 | * Delete the context's mapping pointer, unless it's created by the | |
128 | * kernel API, in which case leave it so it can be freed by reclaim_ctx() | |
129 | */ | |
130 | if (!ctx->kernelapi) { | |
131 | mutex_lock(&ctx->mapping_lock); | |
132 | ctx->mapping = NULL; | |
133 | mutex_unlock(&ctx->mapping_lock); | |
134 | } | |
b123429e | 135 | |
f204e0b8 IM |
136 | /* |
137 | * At this this point all bottom halfs have finished and we should be | |
138 | * getting no more IRQs from the hardware for this context. Once it's | |
139 | * removed from the IDR (and RCU synchronised) it's safe to free the | |
140 | * sstp and context. | |
141 | */ | |
142 | cxl_context_free(ctx); | |
143 | ||
f204e0b8 IM |
144 | return 0; |
145 | } | |
146 | ||
147 | static long afu_ioctl_start_work(struct cxl_context *ctx, | |
148 | struct cxl_ioctl_start_work __user *uwork) | |
149 | { | |
150 | struct cxl_ioctl_start_work work; | |
151 | u64 amr = 0; | |
152 | int rc; | |
153 | ||
154 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); | |
155 | ||
0712dc7e IM |
156 | /* Do this outside the status_mutex to avoid a circular dependency with |
157 | * the locking in cxl_mmap_fault() */ | |
f204e0b8 IM |
158 | if (copy_from_user(&work, uwork, |
159 | sizeof(struct cxl_ioctl_start_work))) { | |
160 | rc = -EFAULT; | |
161 | goto out; | |
162 | } | |
163 | ||
0712dc7e IM |
164 | mutex_lock(&ctx->status_mutex); |
165 | if (ctx->status != OPENED) { | |
166 | rc = -EIO; | |
167 | goto out; | |
168 | } | |
169 | ||
f204e0b8 IM |
170 | /* |
171 | * if any of the reserved fields are set or any of the unused | |
172 | * flags are set it's invalid | |
173 | */ | |
174 | if (work.reserved1 || work.reserved2 || work.reserved3 || | |
175 | work.reserved4 || work.reserved5 || work.reserved6 || | |
176 | (work.flags & ~CXL_START_WORK_ALL)) { | |
177 | rc = -EINVAL; | |
178 | goto out; | |
179 | } | |
180 | ||
181 | if (!(work.flags & CXL_START_WORK_NUM_IRQS)) | |
182 | work.num_interrupts = ctx->afu->pp_irqs; | |
183 | else if ((work.num_interrupts < ctx->afu->pp_irqs) || | |
184 | (work.num_interrupts > ctx->afu->irqs_max)) { | |
185 | rc = -EINVAL; | |
186 | goto out; | |
187 | } | |
188 | if ((rc = afu_register_irqs(ctx, work.num_interrupts))) | |
189 | goto out; | |
190 | ||
191 | if (work.flags & CXL_START_WORK_AMR) | |
192 | amr = work.amr & mfspr(SPRN_UAMOR); | |
193 | ||
d9232a3d IM |
194 | ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF); |
195 | ||
f204e0b8 IM |
196 | /* |
197 | * We grab the PID here and not in the file open to allow for the case | |
198 | * where a process (master, some daemon, etc) has opened the chardev on | |
199 | * behalf of another process, so the AFU's mm gets bound to the process | |
200 | * that performs this ioctl and not the process that opened the file. | |
7b8ad495 VJ |
201 | * Also we grab the PID of the group leader so that if the task that |
202 | * has performed the attach operation exits the mm context of the | |
203 | * process is still accessible. | |
f204e0b8 | 204 | */ |
7b8ad495 VJ |
205 | ctx->pid = get_task_pid(current, PIDTYPE_PID); |
206 | ctx->glpid = get_task_pid(current->group_leader, PIDTYPE_PID); | |
f204e0b8 | 207 | |
70b565bb VJ |
208 | /* |
209 | * Increment the mapped context count for adapter. This also checks | |
210 | * if adapter_context_lock is taken. | |
211 | */ | |
212 | rc = cxl_adapter_context_get(ctx->afu->adapter); | |
213 | if (rc) { | |
214 | afu_release_irqs(ctx, ctx); | |
215 | goto out; | |
216 | } | |
217 | ||
9bcf28cd IM |
218 | trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr); |
219 | ||
5be587b1 FB |
220 | if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor, |
221 | amr))) { | |
6428832a | 222 | afu_release_irqs(ctx, ctx); |
70b565bb | 223 | cxl_adapter_context_put(ctx->afu->adapter); |
f204e0b8 | 224 | goto out; |
456295e2 | 225 | } |
f204e0b8 IM |
226 | |
227 | ctx->status = STARTED; | |
228 | rc = 0; | |
229 | out: | |
230 | mutex_unlock(&ctx->status_mutex); | |
231 | return rc; | |
232 | } | |
5be587b1 | 233 | |
f204e0b8 IM |
234 | static long afu_ioctl_process_element(struct cxl_context *ctx, |
235 | int __user *upe) | |
236 | { | |
237 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); | |
238 | ||
14baf4d9 | 239 | if (copy_to_user(upe, &ctx->external_pe, sizeof(__u32))) |
f204e0b8 IM |
240 | return -EFAULT; |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
27d4dc71 VJ |
245 | static long afu_ioctl_get_afu_id(struct cxl_context *ctx, |
246 | struct cxl_afu_id __user *upafuid) | |
247 | { | |
248 | struct cxl_afu_id afuid = { 0 }; | |
249 | ||
250 | afuid.card_id = ctx->afu->adapter->adapter_num; | |
251 | afuid.afu_offset = ctx->afu->slice; | |
252 | afuid.afu_mode = ctx->afu->current_mode; | |
253 | ||
254 | /* set the flag bit in case the afu is a slave */ | |
255 | if (ctx->afu->current_mode == CXL_MODE_DIRECTED && !ctx->master) | |
256 | afuid.flags |= CXL_AFUID_FLAG_SLAVE; | |
257 | ||
258 | if (copy_to_user(upafuid, &afuid, sizeof(afuid))) | |
259 | return -EFAULT; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
0520336a | 264 | long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
f204e0b8 IM |
265 | { |
266 | struct cxl_context *ctx = file->private_data; | |
267 | ||
268 | if (ctx->status == CLOSED) | |
269 | return -EIO; | |
270 | ||
0d400f77 | 271 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
272 | return -EIO; |
273 | ||
f204e0b8 IM |
274 | pr_devel("afu_ioctl\n"); |
275 | switch (cmd) { | |
276 | case CXL_IOCTL_START_WORK: | |
277 | return afu_ioctl_start_work(ctx, (struct cxl_ioctl_start_work __user *)arg); | |
278 | case CXL_IOCTL_GET_PROCESS_ELEMENT: | |
279 | return afu_ioctl_process_element(ctx, (__u32 __user *)arg); | |
27d4dc71 VJ |
280 | case CXL_IOCTL_GET_AFU_ID: |
281 | return afu_ioctl_get_afu_id(ctx, (struct cxl_afu_id __user *) | |
282 | arg); | |
f204e0b8 IM |
283 | } |
284 | return -EINVAL; | |
285 | } | |
286 | ||
3d6b040e | 287 | static long afu_compat_ioctl(struct file *file, unsigned int cmd, |
f204e0b8 IM |
288 | unsigned long arg) |
289 | { | |
290 | return afu_ioctl(file, cmd, arg); | |
291 | } | |
292 | ||
0520336a | 293 | int afu_mmap(struct file *file, struct vm_area_struct *vm) |
f204e0b8 IM |
294 | { |
295 | struct cxl_context *ctx = file->private_data; | |
296 | ||
297 | /* AFU must be started before we can MMIO */ | |
298 | if (ctx->status != STARTED) | |
299 | return -EIO; | |
300 | ||
0d400f77 | 301 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
302 | return -EIO; |
303 | ||
f204e0b8 IM |
304 | return cxl_context_iomap(ctx, vm); |
305 | } | |
306 | ||
b810253b PB |
307 | static inline bool ctx_event_pending(struct cxl_context *ctx) |
308 | { | |
309 | if (ctx->pending_irq || ctx->pending_fault || ctx->pending_afu_err) | |
310 | return true; | |
311 | ||
312 | if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events)) | |
313 | return true; | |
314 | ||
315 | return false; | |
316 | } | |
317 | ||
0520336a | 318 | unsigned int afu_poll(struct file *file, struct poll_table_struct *poll) |
f204e0b8 IM |
319 | { |
320 | struct cxl_context *ctx = file->private_data; | |
321 | int mask = 0; | |
322 | unsigned long flags; | |
323 | ||
324 | ||
325 | poll_wait(file, &ctx->wq, poll); | |
326 | ||
327 | pr_devel("afu_poll wait done pe: %i\n", ctx->pe); | |
328 | ||
329 | spin_lock_irqsave(&ctx->lock, flags); | |
b810253b | 330 | if (ctx_event_pending(ctx)) |
f204e0b8 IM |
331 | mask |= POLLIN | POLLRDNORM; |
332 | else if (ctx->status == CLOSED) | |
333 | /* Only error on closed when there are no futher events pending | |
334 | */ | |
335 | mask |= POLLERR; | |
336 | spin_unlock_irqrestore(&ctx->lock, flags); | |
337 | ||
338 | pr_devel("afu_poll pe: %i returning %#x\n", ctx->pe, mask); | |
339 | ||
340 | return mask; | |
341 | } | |
342 | ||
b810253b PB |
343 | static ssize_t afu_driver_event_copy(struct cxl_context *ctx, |
344 | char __user *buf, | |
345 | struct cxl_event *event, | |
346 | struct cxl_event_afu_driver_reserved *pl) | |
f204e0b8 | 347 | { |
b810253b PB |
348 | /* Check event */ |
349 | if (!pl) { | |
350 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL); | |
351 | return -EFAULT; | |
352 | } | |
353 | ||
354 | /* Check event size */ | |
355 | event->header.size += pl->data_size; | |
356 | if (event->header.size > CXL_READ_MIN_SIZE) { | |
357 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL); | |
358 | return -EFAULT; | |
359 | } | |
360 | ||
361 | /* Copy event header */ | |
362 | if (copy_to_user(buf, event, sizeof(struct cxl_event_header))) { | |
363 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT); | |
364 | return -EFAULT; | |
365 | } | |
366 | ||
367 | /* Copy event data */ | |
368 | buf += sizeof(struct cxl_event_header); | |
369 | if (copy_to_user(buf, &pl->data, pl->data_size)) { | |
370 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT); | |
371 | return -EFAULT; | |
372 | } | |
373 | ||
374 | ctx->afu_driver_ops->event_delivered(ctx, pl, 0); /* Success */ | |
375 | return event->header.size; | |
f204e0b8 IM |
376 | } |
377 | ||
0520336a | 378 | ssize_t afu_read(struct file *file, char __user *buf, size_t count, |
f204e0b8 IM |
379 | loff_t *off) |
380 | { | |
381 | struct cxl_context *ctx = file->private_data; | |
b810253b | 382 | struct cxl_event_afu_driver_reserved *pl = NULL; |
f204e0b8 IM |
383 | struct cxl_event event; |
384 | unsigned long flags; | |
d53ba6b3 | 385 | int rc; |
f204e0b8 IM |
386 | DEFINE_WAIT(wait); |
387 | ||
0d400f77 | 388 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
389 | return -EIO; |
390 | ||
f204e0b8 IM |
391 | if (count < CXL_READ_MIN_SIZE) |
392 | return -EINVAL; | |
393 | ||
394 | spin_lock_irqsave(&ctx->lock, flags); | |
395 | ||
396 | for (;;) { | |
397 | prepare_to_wait(&ctx->wq, &wait, TASK_INTERRUPTIBLE); | |
b810253b | 398 | if (ctx_event_pending(ctx) || (ctx->status == CLOSED)) |
f204e0b8 IM |
399 | break; |
400 | ||
0d400f77 | 401 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) { |
0b3f9c75 DA |
402 | rc = -EIO; |
403 | goto out; | |
404 | } | |
405 | ||
d53ba6b3 IM |
406 | if (file->f_flags & O_NONBLOCK) { |
407 | rc = -EAGAIN; | |
408 | goto out; | |
409 | } | |
f204e0b8 | 410 | |
d53ba6b3 IM |
411 | if (signal_pending(current)) { |
412 | rc = -ERESTARTSYS; | |
413 | goto out; | |
414 | } | |
f204e0b8 | 415 | |
d53ba6b3 | 416 | spin_unlock_irqrestore(&ctx->lock, flags); |
f204e0b8 IM |
417 | pr_devel("afu_read going to sleep...\n"); |
418 | schedule(); | |
419 | pr_devel("afu_read woken up\n"); | |
420 | spin_lock_irqsave(&ctx->lock, flags); | |
421 | } | |
422 | ||
423 | finish_wait(&ctx->wq, &wait); | |
424 | ||
425 | memset(&event, 0, sizeof(event)); | |
426 | event.header.process_element = ctx->pe; | |
427 | event.header.size = sizeof(struct cxl_event_header); | |
b810253b PB |
428 | if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events)) { |
429 | pr_devel("afu_read delivering AFU driver specific event\n"); | |
430 | pl = ctx->afu_driver_ops->fetch_event(ctx); | |
431 | atomic_dec(&ctx->afu_driver_events); | |
432 | event.header.type = CXL_EVENT_AFU_DRIVER; | |
433 | } else if (ctx->pending_irq) { | |
f204e0b8 IM |
434 | pr_devel("afu_read delivering AFU interrupt\n"); |
435 | event.header.size += sizeof(struct cxl_event_afu_interrupt); | |
436 | event.header.type = CXL_EVENT_AFU_INTERRUPT; | |
437 | event.irq.irq = find_first_bit(ctx->irq_bitmap, ctx->irq_count) + 1; | |
438 | clear_bit(event.irq.irq - 1, ctx->irq_bitmap); | |
439 | if (bitmap_empty(ctx->irq_bitmap, ctx->irq_count)) | |
440 | ctx->pending_irq = false; | |
441 | } else if (ctx->pending_fault) { | |
442 | pr_devel("afu_read delivering data storage fault\n"); | |
443 | event.header.size += sizeof(struct cxl_event_data_storage); | |
444 | event.header.type = CXL_EVENT_DATA_STORAGE; | |
445 | event.fault.addr = ctx->fault_addr; | |
446 | event.fault.dsisr = ctx->fault_dsisr; | |
447 | ctx->pending_fault = false; | |
448 | } else if (ctx->pending_afu_err) { | |
449 | pr_devel("afu_read delivering afu error\n"); | |
450 | event.header.size += sizeof(struct cxl_event_afu_error); | |
451 | event.header.type = CXL_EVENT_AFU_ERROR; | |
452 | event.afu_error.error = ctx->afu_err; | |
453 | ctx->pending_afu_err = false; | |
454 | } else if (ctx->status == CLOSED) { | |
455 | pr_devel("afu_read fatal error\n"); | |
456 | spin_unlock_irqrestore(&ctx->lock, flags); | |
457 | return -EIO; | |
458 | } else | |
459 | WARN(1, "afu_read must be buggy\n"); | |
460 | ||
461 | spin_unlock_irqrestore(&ctx->lock, flags); | |
462 | ||
b810253b PB |
463 | if (event.header.type == CXL_EVENT_AFU_DRIVER) |
464 | return afu_driver_event_copy(ctx, buf, &event, pl); | |
465 | ||
f204e0b8 IM |
466 | if (copy_to_user(buf, &event, event.header.size)) |
467 | return -EFAULT; | |
468 | return event.header.size; | |
d53ba6b3 IM |
469 | |
470 | out: | |
471 | finish_wait(&ctx->wq, &wait); | |
472 | spin_unlock_irqrestore(&ctx->lock, flags); | |
473 | return rc; | |
f204e0b8 IM |
474 | } |
475 | ||
0520336a MN |
476 | /* |
477 | * Note: if this is updated, we need to update api.c to patch the new ones in | |
478 | * too | |
479 | */ | |
480 | const struct file_operations afu_fops = { | |
f204e0b8 IM |
481 | .owner = THIS_MODULE, |
482 | .open = afu_open, | |
483 | .poll = afu_poll, | |
484 | .read = afu_read, | |
485 | .release = afu_release, | |
486 | .unlocked_ioctl = afu_ioctl, | |
487 | .compat_ioctl = afu_compat_ioctl, | |
488 | .mmap = afu_mmap, | |
489 | }; | |
490 | ||
3d6b040e | 491 | static const struct file_operations afu_master_fops = { |
f204e0b8 IM |
492 | .owner = THIS_MODULE, |
493 | .open = afu_master_open, | |
494 | .poll = afu_poll, | |
495 | .read = afu_read, | |
496 | .release = afu_release, | |
497 | .unlocked_ioctl = afu_ioctl, | |
498 | .compat_ioctl = afu_compat_ioctl, | |
499 | .mmap = afu_mmap, | |
500 | }; | |
501 | ||
502 | ||
503 | static char *cxl_devnode(struct device *dev, umode_t *mode) | |
504 | { | |
594ff7d0 CL |
505 | if (cpu_has_feature(CPU_FTR_HVMODE) && |
506 | CXL_DEVT_IS_CARD(dev->devt)) { | |
f204e0b8 IM |
507 | /* |
508 | * These minor numbers will eventually be used to program the | |
509 | * PSL and AFUs once we have dynamic reprogramming support | |
510 | */ | |
511 | return NULL; | |
512 | } | |
513 | return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev)); | |
514 | } | |
515 | ||
516 | extern struct class *cxl_class; | |
517 | ||
518 | static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev, | |
519 | struct device **chardev, char *postfix, char *desc, | |
520 | const struct file_operations *fops) | |
521 | { | |
522 | struct device *dev; | |
523 | int rc; | |
524 | ||
525 | cdev_init(cdev, fops); | |
526 | if ((rc = cdev_add(cdev, devt, 1))) { | |
527 | dev_err(&afu->dev, "Unable to add %s chardev: %i\n", desc, rc); | |
528 | return rc; | |
529 | } | |
530 | ||
531 | dev = device_create(cxl_class, &afu->dev, devt, afu, | |
532 | "afu%i.%i%s", afu->adapter->adapter_num, afu->slice, postfix); | |
533 | if (IS_ERR(dev)) { | |
534 | dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc); | |
535 | rc = PTR_ERR(dev); | |
536 | goto err; | |
537 | } | |
538 | ||
539 | *chardev = dev; | |
540 | ||
541 | return 0; | |
542 | err: | |
543 | cdev_del(cdev); | |
544 | return rc; | |
545 | } | |
546 | ||
547 | int cxl_chardev_d_afu_add(struct cxl_afu *afu) | |
548 | { | |
549 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_D(afu), &afu->afu_cdev_d, | |
550 | &afu->chardev_d, "d", "dedicated", | |
551 | &afu_master_fops); /* Uses master fops */ | |
552 | } | |
553 | ||
554 | int cxl_chardev_m_afu_add(struct cxl_afu *afu) | |
555 | { | |
556 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_M(afu), &afu->afu_cdev_m, | |
557 | &afu->chardev_m, "m", "master", | |
558 | &afu_master_fops); | |
559 | } | |
560 | ||
561 | int cxl_chardev_s_afu_add(struct cxl_afu *afu) | |
562 | { | |
563 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_S(afu), &afu->afu_cdev_s, | |
564 | &afu->chardev_s, "s", "shared", | |
565 | &afu_fops); | |
566 | } | |
567 | ||
568 | void cxl_chardev_afu_remove(struct cxl_afu *afu) | |
569 | { | |
570 | if (afu->chardev_d) { | |
571 | cdev_del(&afu->afu_cdev_d); | |
572 | device_unregister(afu->chardev_d); | |
573 | afu->chardev_d = NULL; | |
574 | } | |
575 | if (afu->chardev_m) { | |
576 | cdev_del(&afu->afu_cdev_m); | |
577 | device_unregister(afu->chardev_m); | |
578 | afu->chardev_m = NULL; | |
579 | } | |
580 | if (afu->chardev_s) { | |
581 | cdev_del(&afu->afu_cdev_s); | |
582 | device_unregister(afu->chardev_s); | |
583 | afu->chardev_s = NULL; | |
584 | } | |
585 | } | |
586 | ||
587 | int cxl_register_afu(struct cxl_afu *afu) | |
588 | { | |
589 | afu->dev.class = cxl_class; | |
590 | ||
591 | return device_register(&afu->dev); | |
592 | } | |
593 | ||
594 | int cxl_register_adapter(struct cxl *adapter) | |
595 | { | |
596 | adapter->dev.class = cxl_class; | |
597 | ||
598 | /* | |
599 | * Future: When we support dynamically reprogramming the PSL & AFU we | |
600 | * will expose the interface to do that via a chardev: | |
601 | * adapter->dev.devt = CXL_CARD_MKDEV(adapter); | |
602 | */ | |
603 | ||
604 | return device_register(&adapter->dev); | |
605 | } | |
606 | ||
594ff7d0 CL |
607 | dev_t cxl_get_dev(void) |
608 | { | |
609 | return cxl_dev; | |
610 | } | |
611 | ||
f204e0b8 IM |
612 | int __init cxl_file_init(void) |
613 | { | |
614 | int rc; | |
615 | ||
616 | /* | |
617 | * If these change we really need to update API. Either change some | |
618 | * flags or update API version number CXL_API_VERSION. | |
619 | */ | |
b810253b | 620 | BUILD_BUG_ON(CXL_API_VERSION != 3); |
f204e0b8 IM |
621 | BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64); |
622 | BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8); | |
623 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8); | |
624 | BUILD_BUG_ON(sizeof(struct cxl_event_data_storage) != 32); | |
625 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_error) != 16); | |
626 | ||
627 | if ((rc = alloc_chrdev_region(&cxl_dev, 0, CXL_NUM_MINORS, "cxl"))) { | |
628 | pr_err("Unable to allocate CXL major number: %i\n", rc); | |
629 | return rc; | |
630 | } | |
631 | ||
632 | pr_devel("CXL device allocated, MAJOR %i\n", MAJOR(cxl_dev)); | |
633 | ||
634 | cxl_class = class_create(THIS_MODULE, "cxl"); | |
635 | if (IS_ERR(cxl_class)) { | |
636 | pr_err("Unable to create CXL class\n"); | |
637 | rc = PTR_ERR(cxl_class); | |
638 | goto err; | |
639 | } | |
640 | cxl_class->devnode = cxl_devnode; | |
641 | ||
642 | return 0; | |
643 | ||
644 | err: | |
645 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); | |
646 | return rc; | |
647 | } | |
648 | ||
649 | void cxl_file_exit(void) | |
650 | { | |
651 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); | |
652 | class_destroy(cxl_class); | |
653 | } |