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Commit | Line | Data |
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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> | |
174cd4b1 | 15 | #include <linux/sched/signal.h> |
f204e0b8 IM |
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 | ||
bdecf76e FB |
89 | rc = cxl_context_init(ctx, afu, master); |
90 | if (rc) | |
f204e0b8 IM |
91 | goto err_put_afu; |
92 | ||
bdecf76e FB |
93 | cxl_context_set_mapping(ctx, inode->i_mapping); |
94 | ||
f204e0b8 IM |
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 | ||
a05b82d5 VJ |
199 | /* |
200 | * Increment the mapped context count for adapter. This also checks | |
201 | * if adapter_context_lock is taken. | |
202 | */ | |
203 | rc = cxl_adapter_context_get(ctx->afu->adapter); | |
204 | if (rc) { | |
205 | afu_release_irqs(ctx, ctx); | |
206 | goto out; | |
207 | } | |
208 | ||
f204e0b8 IM |
209 | /* |
210 | * We grab the PID here and not in the file open to allow for the case | |
211 | * where a process (master, some daemon, etc) has opened the chardev on | |
212 | * behalf of another process, so the AFU's mm gets bound to the process | |
213 | * that performs this ioctl and not the process that opened the file. | |
7b8ad495 VJ |
214 | * Also we grab the PID of the group leader so that if the task that |
215 | * has performed the attach operation exits the mm context of the | |
216 | * process is still accessible. | |
f204e0b8 | 217 | */ |
7b8ad495 VJ |
218 | ctx->pid = get_task_pid(current, PIDTYPE_PID); |
219 | ctx->glpid = get_task_pid(current->group_leader, PIDTYPE_PID); | |
f204e0b8 | 220 | |
70b565bb | 221 | |
9bcf28cd IM |
222 | trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr); |
223 | ||
5be587b1 FB |
224 | if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor, |
225 | amr))) { | |
6428832a | 226 | afu_release_irqs(ctx, ctx); |
70b565bb | 227 | cxl_adapter_context_put(ctx->afu->adapter); |
a05b82d5 VJ |
228 | put_pid(ctx->glpid); |
229 | put_pid(ctx->pid); | |
230 | ctx->glpid = ctx->pid = NULL; | |
f204e0b8 | 231 | goto out; |
456295e2 | 232 | } |
f204e0b8 IM |
233 | |
234 | ctx->status = STARTED; | |
235 | rc = 0; | |
236 | out: | |
237 | mutex_unlock(&ctx->status_mutex); | |
238 | return rc; | |
239 | } | |
5be587b1 | 240 | |
f204e0b8 IM |
241 | static long afu_ioctl_process_element(struct cxl_context *ctx, |
242 | int __user *upe) | |
243 | { | |
244 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); | |
245 | ||
14baf4d9 | 246 | if (copy_to_user(upe, &ctx->external_pe, sizeof(__u32))) |
f204e0b8 IM |
247 | return -EFAULT; |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
27d4dc71 VJ |
252 | static long afu_ioctl_get_afu_id(struct cxl_context *ctx, |
253 | struct cxl_afu_id __user *upafuid) | |
254 | { | |
255 | struct cxl_afu_id afuid = { 0 }; | |
256 | ||
257 | afuid.card_id = ctx->afu->adapter->adapter_num; | |
258 | afuid.afu_offset = ctx->afu->slice; | |
259 | afuid.afu_mode = ctx->afu->current_mode; | |
260 | ||
261 | /* set the flag bit in case the afu is a slave */ | |
262 | if (ctx->afu->current_mode == CXL_MODE_DIRECTED && !ctx->master) | |
263 | afuid.flags |= CXL_AFUID_FLAG_SLAVE; | |
264 | ||
265 | if (copy_to_user(upafuid, &afuid, sizeof(afuid))) | |
266 | return -EFAULT; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
0520336a | 271 | long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
f204e0b8 IM |
272 | { |
273 | struct cxl_context *ctx = file->private_data; | |
274 | ||
275 | if (ctx->status == CLOSED) | |
276 | return -EIO; | |
277 | ||
0d400f77 | 278 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
279 | return -EIO; |
280 | ||
f204e0b8 IM |
281 | pr_devel("afu_ioctl\n"); |
282 | switch (cmd) { | |
283 | case CXL_IOCTL_START_WORK: | |
284 | return afu_ioctl_start_work(ctx, (struct cxl_ioctl_start_work __user *)arg); | |
285 | case CXL_IOCTL_GET_PROCESS_ELEMENT: | |
286 | return afu_ioctl_process_element(ctx, (__u32 __user *)arg); | |
27d4dc71 VJ |
287 | case CXL_IOCTL_GET_AFU_ID: |
288 | return afu_ioctl_get_afu_id(ctx, (struct cxl_afu_id __user *) | |
289 | arg); | |
f204e0b8 IM |
290 | } |
291 | return -EINVAL; | |
292 | } | |
293 | ||
3d6b040e | 294 | static long afu_compat_ioctl(struct file *file, unsigned int cmd, |
f204e0b8 IM |
295 | unsigned long arg) |
296 | { | |
297 | return afu_ioctl(file, cmd, arg); | |
298 | } | |
299 | ||
0520336a | 300 | int afu_mmap(struct file *file, struct vm_area_struct *vm) |
f204e0b8 IM |
301 | { |
302 | struct cxl_context *ctx = file->private_data; | |
303 | ||
304 | /* AFU must be started before we can MMIO */ | |
305 | if (ctx->status != STARTED) | |
306 | return -EIO; | |
307 | ||
0d400f77 | 308 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
309 | return -EIO; |
310 | ||
f204e0b8 IM |
311 | return cxl_context_iomap(ctx, vm); |
312 | } | |
313 | ||
b810253b PB |
314 | static inline bool ctx_event_pending(struct cxl_context *ctx) |
315 | { | |
316 | if (ctx->pending_irq || ctx->pending_fault || ctx->pending_afu_err) | |
317 | return true; | |
318 | ||
319 | if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events)) | |
320 | return true; | |
321 | ||
322 | return false; | |
323 | } | |
324 | ||
0520336a | 325 | unsigned int afu_poll(struct file *file, struct poll_table_struct *poll) |
f204e0b8 IM |
326 | { |
327 | struct cxl_context *ctx = file->private_data; | |
328 | int mask = 0; | |
329 | unsigned long flags; | |
330 | ||
331 | ||
332 | poll_wait(file, &ctx->wq, poll); | |
333 | ||
334 | pr_devel("afu_poll wait done pe: %i\n", ctx->pe); | |
335 | ||
336 | spin_lock_irqsave(&ctx->lock, flags); | |
b810253b | 337 | if (ctx_event_pending(ctx)) |
f204e0b8 IM |
338 | mask |= POLLIN | POLLRDNORM; |
339 | else if (ctx->status == CLOSED) | |
340 | /* Only error on closed when there are no futher events pending | |
341 | */ | |
342 | mask |= POLLERR; | |
343 | spin_unlock_irqrestore(&ctx->lock, flags); | |
344 | ||
345 | pr_devel("afu_poll pe: %i returning %#x\n", ctx->pe, mask); | |
346 | ||
347 | return mask; | |
348 | } | |
349 | ||
b810253b PB |
350 | static ssize_t afu_driver_event_copy(struct cxl_context *ctx, |
351 | char __user *buf, | |
352 | struct cxl_event *event, | |
353 | struct cxl_event_afu_driver_reserved *pl) | |
f204e0b8 | 354 | { |
b810253b PB |
355 | /* Check event */ |
356 | if (!pl) { | |
357 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL); | |
358 | return -EFAULT; | |
359 | } | |
360 | ||
361 | /* Check event size */ | |
362 | event->header.size += pl->data_size; | |
363 | if (event->header.size > CXL_READ_MIN_SIZE) { | |
364 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL); | |
365 | return -EFAULT; | |
366 | } | |
367 | ||
368 | /* Copy event header */ | |
369 | if (copy_to_user(buf, event, sizeof(struct cxl_event_header))) { | |
370 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT); | |
371 | return -EFAULT; | |
372 | } | |
373 | ||
374 | /* Copy event data */ | |
375 | buf += sizeof(struct cxl_event_header); | |
376 | if (copy_to_user(buf, &pl->data, pl->data_size)) { | |
377 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT); | |
378 | return -EFAULT; | |
379 | } | |
380 | ||
381 | ctx->afu_driver_ops->event_delivered(ctx, pl, 0); /* Success */ | |
382 | return event->header.size; | |
f204e0b8 IM |
383 | } |
384 | ||
0520336a | 385 | ssize_t afu_read(struct file *file, char __user *buf, size_t count, |
f204e0b8 IM |
386 | loff_t *off) |
387 | { | |
388 | struct cxl_context *ctx = file->private_data; | |
b810253b | 389 | struct cxl_event_afu_driver_reserved *pl = NULL; |
f204e0b8 IM |
390 | struct cxl_event event; |
391 | unsigned long flags; | |
d53ba6b3 | 392 | int rc; |
f204e0b8 IM |
393 | DEFINE_WAIT(wait); |
394 | ||
0d400f77 | 395 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
396 | return -EIO; |
397 | ||
f204e0b8 IM |
398 | if (count < CXL_READ_MIN_SIZE) |
399 | return -EINVAL; | |
400 | ||
401 | spin_lock_irqsave(&ctx->lock, flags); | |
402 | ||
403 | for (;;) { | |
404 | prepare_to_wait(&ctx->wq, &wait, TASK_INTERRUPTIBLE); | |
b810253b | 405 | if (ctx_event_pending(ctx) || (ctx->status == CLOSED)) |
f204e0b8 IM |
406 | break; |
407 | ||
0d400f77 | 408 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) { |
0b3f9c75 DA |
409 | rc = -EIO; |
410 | goto out; | |
411 | } | |
412 | ||
d53ba6b3 IM |
413 | if (file->f_flags & O_NONBLOCK) { |
414 | rc = -EAGAIN; | |
415 | goto out; | |
416 | } | |
f204e0b8 | 417 | |
d53ba6b3 IM |
418 | if (signal_pending(current)) { |
419 | rc = -ERESTARTSYS; | |
420 | goto out; | |
421 | } | |
f204e0b8 | 422 | |
d53ba6b3 | 423 | spin_unlock_irqrestore(&ctx->lock, flags); |
f204e0b8 IM |
424 | pr_devel("afu_read going to sleep...\n"); |
425 | schedule(); | |
426 | pr_devel("afu_read woken up\n"); | |
427 | spin_lock_irqsave(&ctx->lock, flags); | |
428 | } | |
429 | ||
430 | finish_wait(&ctx->wq, &wait); | |
431 | ||
432 | memset(&event, 0, sizeof(event)); | |
433 | event.header.process_element = ctx->pe; | |
434 | event.header.size = sizeof(struct cxl_event_header); | |
b810253b PB |
435 | if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events)) { |
436 | pr_devel("afu_read delivering AFU driver specific event\n"); | |
437 | pl = ctx->afu_driver_ops->fetch_event(ctx); | |
438 | atomic_dec(&ctx->afu_driver_events); | |
439 | event.header.type = CXL_EVENT_AFU_DRIVER; | |
440 | } else if (ctx->pending_irq) { | |
f204e0b8 IM |
441 | pr_devel("afu_read delivering AFU interrupt\n"); |
442 | event.header.size += sizeof(struct cxl_event_afu_interrupt); | |
443 | event.header.type = CXL_EVENT_AFU_INTERRUPT; | |
444 | event.irq.irq = find_first_bit(ctx->irq_bitmap, ctx->irq_count) + 1; | |
445 | clear_bit(event.irq.irq - 1, ctx->irq_bitmap); | |
446 | if (bitmap_empty(ctx->irq_bitmap, ctx->irq_count)) | |
447 | ctx->pending_irq = false; | |
448 | } else if (ctx->pending_fault) { | |
449 | pr_devel("afu_read delivering data storage fault\n"); | |
450 | event.header.size += sizeof(struct cxl_event_data_storage); | |
451 | event.header.type = CXL_EVENT_DATA_STORAGE; | |
452 | event.fault.addr = ctx->fault_addr; | |
453 | event.fault.dsisr = ctx->fault_dsisr; | |
454 | ctx->pending_fault = false; | |
455 | } else if (ctx->pending_afu_err) { | |
456 | pr_devel("afu_read delivering afu error\n"); | |
457 | event.header.size += sizeof(struct cxl_event_afu_error); | |
458 | event.header.type = CXL_EVENT_AFU_ERROR; | |
459 | event.afu_error.error = ctx->afu_err; | |
460 | ctx->pending_afu_err = false; | |
461 | } else if (ctx->status == CLOSED) { | |
462 | pr_devel("afu_read fatal error\n"); | |
463 | spin_unlock_irqrestore(&ctx->lock, flags); | |
464 | return -EIO; | |
465 | } else | |
466 | WARN(1, "afu_read must be buggy\n"); | |
467 | ||
468 | spin_unlock_irqrestore(&ctx->lock, flags); | |
469 | ||
b810253b PB |
470 | if (event.header.type == CXL_EVENT_AFU_DRIVER) |
471 | return afu_driver_event_copy(ctx, buf, &event, pl); | |
472 | ||
f204e0b8 IM |
473 | if (copy_to_user(buf, &event, event.header.size)) |
474 | return -EFAULT; | |
475 | return event.header.size; | |
d53ba6b3 IM |
476 | |
477 | out: | |
478 | finish_wait(&ctx->wq, &wait); | |
479 | spin_unlock_irqrestore(&ctx->lock, flags); | |
480 | return rc; | |
f204e0b8 IM |
481 | } |
482 | ||
0520336a MN |
483 | /* |
484 | * Note: if this is updated, we need to update api.c to patch the new ones in | |
485 | * too | |
486 | */ | |
487 | const struct file_operations afu_fops = { | |
f204e0b8 IM |
488 | .owner = THIS_MODULE, |
489 | .open = afu_open, | |
490 | .poll = afu_poll, | |
491 | .read = afu_read, | |
492 | .release = afu_release, | |
493 | .unlocked_ioctl = afu_ioctl, | |
494 | .compat_ioctl = afu_compat_ioctl, | |
495 | .mmap = afu_mmap, | |
496 | }; | |
497 | ||
3d6b040e | 498 | static const struct file_operations afu_master_fops = { |
f204e0b8 IM |
499 | .owner = THIS_MODULE, |
500 | .open = afu_master_open, | |
501 | .poll = afu_poll, | |
502 | .read = afu_read, | |
503 | .release = afu_release, | |
504 | .unlocked_ioctl = afu_ioctl, | |
505 | .compat_ioctl = afu_compat_ioctl, | |
506 | .mmap = afu_mmap, | |
507 | }; | |
508 | ||
509 | ||
510 | static char *cxl_devnode(struct device *dev, umode_t *mode) | |
511 | { | |
594ff7d0 CL |
512 | if (cpu_has_feature(CPU_FTR_HVMODE) && |
513 | CXL_DEVT_IS_CARD(dev->devt)) { | |
f204e0b8 IM |
514 | /* |
515 | * These minor numbers will eventually be used to program the | |
516 | * PSL and AFUs once we have dynamic reprogramming support | |
517 | */ | |
518 | return NULL; | |
519 | } | |
520 | return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev)); | |
521 | } | |
522 | ||
523 | extern struct class *cxl_class; | |
524 | ||
525 | static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev, | |
526 | struct device **chardev, char *postfix, char *desc, | |
527 | const struct file_operations *fops) | |
528 | { | |
529 | struct device *dev; | |
530 | int rc; | |
531 | ||
532 | cdev_init(cdev, fops); | |
533 | if ((rc = cdev_add(cdev, devt, 1))) { | |
534 | dev_err(&afu->dev, "Unable to add %s chardev: %i\n", desc, rc); | |
535 | return rc; | |
536 | } | |
537 | ||
538 | dev = device_create(cxl_class, &afu->dev, devt, afu, | |
539 | "afu%i.%i%s", afu->adapter->adapter_num, afu->slice, postfix); | |
540 | if (IS_ERR(dev)) { | |
541 | dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc); | |
542 | rc = PTR_ERR(dev); | |
543 | goto err; | |
544 | } | |
545 | ||
546 | *chardev = dev; | |
547 | ||
548 | return 0; | |
549 | err: | |
550 | cdev_del(cdev); | |
551 | return rc; | |
552 | } | |
553 | ||
554 | int cxl_chardev_d_afu_add(struct cxl_afu *afu) | |
555 | { | |
556 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_D(afu), &afu->afu_cdev_d, | |
557 | &afu->chardev_d, "d", "dedicated", | |
558 | &afu_master_fops); /* Uses master fops */ | |
559 | } | |
560 | ||
561 | int cxl_chardev_m_afu_add(struct cxl_afu *afu) | |
562 | { | |
563 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_M(afu), &afu->afu_cdev_m, | |
564 | &afu->chardev_m, "m", "master", | |
565 | &afu_master_fops); | |
566 | } | |
567 | ||
568 | int cxl_chardev_s_afu_add(struct cxl_afu *afu) | |
569 | { | |
570 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_S(afu), &afu->afu_cdev_s, | |
571 | &afu->chardev_s, "s", "shared", | |
572 | &afu_fops); | |
573 | } | |
574 | ||
575 | void cxl_chardev_afu_remove(struct cxl_afu *afu) | |
576 | { | |
577 | if (afu->chardev_d) { | |
578 | cdev_del(&afu->afu_cdev_d); | |
579 | device_unregister(afu->chardev_d); | |
580 | afu->chardev_d = NULL; | |
581 | } | |
582 | if (afu->chardev_m) { | |
583 | cdev_del(&afu->afu_cdev_m); | |
584 | device_unregister(afu->chardev_m); | |
585 | afu->chardev_m = NULL; | |
586 | } | |
587 | if (afu->chardev_s) { | |
588 | cdev_del(&afu->afu_cdev_s); | |
589 | device_unregister(afu->chardev_s); | |
590 | afu->chardev_s = NULL; | |
591 | } | |
592 | } | |
593 | ||
594 | int cxl_register_afu(struct cxl_afu *afu) | |
595 | { | |
596 | afu->dev.class = cxl_class; | |
597 | ||
598 | return device_register(&afu->dev); | |
599 | } | |
600 | ||
601 | int cxl_register_adapter(struct cxl *adapter) | |
602 | { | |
603 | adapter->dev.class = cxl_class; | |
604 | ||
605 | /* | |
606 | * Future: When we support dynamically reprogramming the PSL & AFU we | |
607 | * will expose the interface to do that via a chardev: | |
608 | * adapter->dev.devt = CXL_CARD_MKDEV(adapter); | |
609 | */ | |
610 | ||
611 | return device_register(&adapter->dev); | |
612 | } | |
613 | ||
594ff7d0 CL |
614 | dev_t cxl_get_dev(void) |
615 | { | |
616 | return cxl_dev; | |
617 | } | |
618 | ||
f204e0b8 IM |
619 | int __init cxl_file_init(void) |
620 | { | |
621 | int rc; | |
622 | ||
623 | /* | |
624 | * If these change we really need to update API. Either change some | |
625 | * flags or update API version number CXL_API_VERSION. | |
626 | */ | |
b810253b | 627 | BUILD_BUG_ON(CXL_API_VERSION != 3); |
f204e0b8 IM |
628 | BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64); |
629 | BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8); | |
630 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8); | |
631 | BUILD_BUG_ON(sizeof(struct cxl_event_data_storage) != 32); | |
632 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_error) != 16); | |
633 | ||
634 | if ((rc = alloc_chrdev_region(&cxl_dev, 0, CXL_NUM_MINORS, "cxl"))) { | |
635 | pr_err("Unable to allocate CXL major number: %i\n", rc); | |
636 | return rc; | |
637 | } | |
638 | ||
639 | pr_devel("CXL device allocated, MAJOR %i\n", MAJOR(cxl_dev)); | |
640 | ||
641 | cxl_class = class_create(THIS_MODULE, "cxl"); | |
642 | if (IS_ERR(cxl_class)) { | |
643 | pr_err("Unable to create CXL class\n"); | |
644 | rc = PTR_ERR(cxl_class); | |
645 | goto err; | |
646 | } | |
647 | cxl_class->devnode = cxl_devnode; | |
648 | ||
649 | return 0; | |
650 | ||
651 | err: | |
652 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); | |
653 | return rc; | |
654 | } | |
655 | ||
656 | void cxl_file_exit(void) | |
657 | { | |
658 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); | |
659 | class_destroy(cxl_class); | |
660 | } |