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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f204e0b8 IM |
2 | /* |
3 | * Copyright 2014 IBM Corp. | |
f204e0b8 IM |
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> | |
174cd4b1 | 11 | #include <linux/sched/signal.h> |
f204e0b8 IM |
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> | |
6dd2d234 | 17 | #include <linux/sched/mm.h> |
03b8abed | 18 | #include <linux/mmu_context.h> |
f204e0b8 IM |
19 | #include <asm/cputable.h> |
20 | #include <asm/current.h> | |
21 | #include <asm/copro.h> | |
22 | ||
23 | #include "cxl.h" | |
9bcf28cd | 24 | #include "trace.h" |
f204e0b8 IM |
25 | |
26 | #define CXL_NUM_MINORS 256 /* Total to reserve */ | |
f204e0b8 | 27 | |
f204e0b8 IM |
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 | ||
f204e0b8 IM |
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 struct class *cxl_class; | |
42 | ||
43 | static int __afu_open(struct inode *inode, struct file *file, bool master) | |
44 | { | |
45 | struct cxl *adapter; | |
46 | struct cxl_afu *afu; | |
47 | struct cxl_context *ctx; | |
48 | int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev); | |
49 | int slice = CXL_DEVT_AFU(inode->i_rdev); | |
50 | int rc = -ENODEV; | |
51 | ||
52 | pr_devel("afu_open afu%i.%i\n", slice, adapter_num); | |
53 | ||
54 | if (!(adapter = get_cxl_adapter(adapter_num))) | |
55 | return -ENODEV; | |
56 | ||
57 | if (slice > adapter->slices) | |
58 | goto err_put_adapter; | |
59 | ||
60 | spin_lock(&adapter->afu_list_lock); | |
61 | if (!(afu = adapter->afu[slice])) { | |
62 | spin_unlock(&adapter->afu_list_lock); | |
63 | goto err_put_adapter; | |
64 | } | |
1b5df59e VJ |
65 | |
66 | /* | |
67 | * taking a ref to the afu so that it doesn't go away | |
68 | * for rest of the function. This ref is released before | |
69 | * we return. | |
70 | */ | |
71 | cxl_afu_get(afu); | |
f204e0b8 IM |
72 | spin_unlock(&adapter->afu_list_lock); |
73 | ||
74 | if (!afu->current_mode) | |
75 | goto err_put_afu; | |
76 | ||
0d400f77 | 77 | if (!cxl_ops->link_ok(adapter, afu)) { |
0b3f9c75 DA |
78 | rc = -EIO; |
79 | goto err_put_afu; | |
80 | } | |
81 | ||
f204e0b8 IM |
82 | if (!(ctx = cxl_context_alloc())) { |
83 | rc = -ENOMEM; | |
84 | goto err_put_afu; | |
85 | } | |
86 | ||
bdecf76e FB |
87 | rc = cxl_context_init(ctx, afu, master); |
88 | if (rc) | |
f204e0b8 IM |
89 | goto err_put_afu; |
90 | ||
bdecf76e FB |
91 | cxl_context_set_mapping(ctx, inode->i_mapping); |
92 | ||
f204e0b8 IM |
93 | pr_devel("afu_open pe: %i\n", ctx->pe); |
94 | file->private_data = ctx; | |
f204e0b8 | 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() */ | |
cec422c1 FB |
158 | if (copy_from_user(&work, uwork, sizeof(work))) |
159 | return -EFAULT; | |
f204e0b8 | 160 | |
0712dc7e IM |
161 | mutex_lock(&ctx->status_mutex); |
162 | if (ctx->status != OPENED) { | |
163 | rc = -EIO; | |
164 | goto out; | |
165 | } | |
166 | ||
f204e0b8 IM |
167 | /* |
168 | * if any of the reserved fields are set or any of the unused | |
169 | * flags are set it's invalid | |
170 | */ | |
171 | if (work.reserved1 || work.reserved2 || work.reserved3 || | |
b1db5513 | 172 | work.reserved4 || work.reserved5 || |
f204e0b8 IM |
173 | (work.flags & ~CXL_START_WORK_ALL)) { |
174 | rc = -EINVAL; | |
175 | goto out; | |
176 | } | |
177 | ||
178 | if (!(work.flags & CXL_START_WORK_NUM_IRQS)) | |
179 | work.num_interrupts = ctx->afu->pp_irqs; | |
180 | else if ((work.num_interrupts < ctx->afu->pp_irqs) || | |
181 | (work.num_interrupts > ctx->afu->irqs_max)) { | |
182 | rc = -EINVAL; | |
183 | goto out; | |
184 | } | |
b1db5513 | 185 | |
f204e0b8 IM |
186 | if ((rc = afu_register_irqs(ctx, work.num_interrupts))) |
187 | goto out; | |
188 | ||
189 | if (work.flags & CXL_START_WORK_AMR) | |
190 | amr = work.amr & mfspr(SPRN_UAMOR); | |
191 | ||
b1db5513 CL |
192 | if (work.flags & CXL_START_WORK_TID) |
193 | ctx->assign_tidr = true; | |
194 | ||
d9232a3d IM |
195 | ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF); |
196 | ||
a05b82d5 VJ |
197 | /* |
198 | * Increment the mapped context count for adapter. This also checks | |
199 | * if adapter_context_lock is taken. | |
200 | */ | |
201 | rc = cxl_adapter_context_get(ctx->afu->adapter); | |
202 | if (rc) { | |
203 | afu_release_irqs(ctx, ctx); | |
204 | goto out; | |
205 | } | |
206 | ||
f204e0b8 IM |
207 | /* |
208 | * We grab the PID here and not in the file open to allow for the case | |
209 | * where a process (master, some daemon, etc) has opened the chardev on | |
210 | * behalf of another process, so the AFU's mm gets bound to the process | |
211 | * that performs this ioctl and not the process that opened the file. | |
7b8ad495 VJ |
212 | * Also we grab the PID of the group leader so that if the task that |
213 | * has performed the attach operation exits the mm context of the | |
214 | * process is still accessible. | |
f204e0b8 | 215 | */ |
7b8ad495 | 216 | ctx->pid = get_task_pid(current, PIDTYPE_PID); |
f204e0b8 | 217 | |
6dd2d234 CL |
218 | /* acquire a reference to the task's mm */ |
219 | ctx->mm = get_task_mm(current); | |
220 | ||
221 | /* ensure this mm_struct can't be freed */ | |
222 | cxl_context_mm_count_get(ctx); | |
223 | ||
03b8abed FB |
224 | if (ctx->mm) { |
225 | /* decrement the use count from above */ | |
6dd2d234 | 226 | mmput(ctx->mm); |
03b8abed FB |
227 | /* make TLBIs for this context global */ |
228 | mm_context_add_copro(ctx->mm); | |
229 | } | |
70b565bb | 230 | |
197267d0 FB |
231 | /* |
232 | * Increment driver use count. Enables global TLBIs for hash | |
233 | * and callbacks to handle the segment table | |
234 | */ | |
235 | cxl_ctx_get(); | |
236 | ||
03b8abed FB |
237 | /* |
238 | * A barrier is needed to make sure all TLBIs are global | |
239 | * before we attach and the context starts being used by the | |
240 | * adapter. | |
241 | * | |
242 | * Needed after mm_context_add_copro() for radix and | |
243 | * cxl_ctx_get() for hash/p8. | |
244 | * | |
245 | * The barrier should really be mb(), since it involves a | |
246 | * device. However, it's only useful when we have local | |
247 | * vs. global TLBIs, i.e SMP=y. So keep smp_mb(). | |
248 | */ | |
249 | smp_mb(); | |
250 | ||
9bcf28cd IM |
251 | trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr); |
252 | ||
5be587b1 FB |
253 | if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor, |
254 | amr))) { | |
6428832a | 255 | afu_release_irqs(ctx, ctx); |
70b565bb | 256 | cxl_adapter_context_put(ctx->afu->adapter); |
a05b82d5 | 257 | put_pid(ctx->pid); |
6dd2d234 | 258 | ctx->pid = NULL; |
197267d0 | 259 | cxl_ctx_put(); |
6dd2d234 | 260 | cxl_context_mm_count_put(ctx); |
03b8abed FB |
261 | if (ctx->mm) |
262 | mm_context_remove_copro(ctx->mm); | |
f204e0b8 | 263 | goto out; |
456295e2 | 264 | } |
f204e0b8 | 265 | |
f204e0b8 | 266 | rc = 0; |
b1db5513 CL |
267 | if (work.flags & CXL_START_WORK_TID) { |
268 | work.tid = ctx->tidr; | |
269 | if (copy_to_user(uwork, &work, sizeof(work))) | |
270 | rc = -EFAULT; | |
271 | } | |
272 | ||
273 | ctx->status = STARTED; | |
274 | ||
f204e0b8 IM |
275 | out: |
276 | mutex_unlock(&ctx->status_mutex); | |
277 | return rc; | |
278 | } | |
5be587b1 | 279 | |
f204e0b8 IM |
280 | static long afu_ioctl_process_element(struct cxl_context *ctx, |
281 | int __user *upe) | |
282 | { | |
283 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); | |
284 | ||
14baf4d9 | 285 | if (copy_to_user(upe, &ctx->external_pe, sizeof(__u32))) |
f204e0b8 IM |
286 | return -EFAULT; |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
27d4dc71 VJ |
291 | static long afu_ioctl_get_afu_id(struct cxl_context *ctx, |
292 | struct cxl_afu_id __user *upafuid) | |
293 | { | |
294 | struct cxl_afu_id afuid = { 0 }; | |
295 | ||
296 | afuid.card_id = ctx->afu->adapter->adapter_num; | |
297 | afuid.afu_offset = ctx->afu->slice; | |
298 | afuid.afu_mode = ctx->afu->current_mode; | |
299 | ||
300 | /* set the flag bit in case the afu is a slave */ | |
301 | if (ctx->afu->current_mode == CXL_MODE_DIRECTED && !ctx->master) | |
302 | afuid.flags |= CXL_AFUID_FLAG_SLAVE; | |
303 | ||
304 | if (copy_to_user(upafuid, &afuid, sizeof(afuid))) | |
305 | return -EFAULT; | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
0520336a | 310 | long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
f204e0b8 IM |
311 | { |
312 | struct cxl_context *ctx = file->private_data; | |
313 | ||
314 | if (ctx->status == CLOSED) | |
315 | return -EIO; | |
316 | ||
0d400f77 | 317 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
318 | return -EIO; |
319 | ||
f204e0b8 IM |
320 | pr_devel("afu_ioctl\n"); |
321 | switch (cmd) { | |
322 | case CXL_IOCTL_START_WORK: | |
323 | return afu_ioctl_start_work(ctx, (struct cxl_ioctl_start_work __user *)arg); | |
324 | case CXL_IOCTL_GET_PROCESS_ELEMENT: | |
325 | return afu_ioctl_process_element(ctx, (__u32 __user *)arg); | |
27d4dc71 VJ |
326 | case CXL_IOCTL_GET_AFU_ID: |
327 | return afu_ioctl_get_afu_id(ctx, (struct cxl_afu_id __user *) | |
328 | arg); | |
f204e0b8 IM |
329 | } |
330 | return -EINVAL; | |
331 | } | |
332 | ||
3d6b040e | 333 | static long afu_compat_ioctl(struct file *file, unsigned int cmd, |
f204e0b8 IM |
334 | unsigned long arg) |
335 | { | |
336 | return afu_ioctl(file, cmd, arg); | |
337 | } | |
338 | ||
0520336a | 339 | int afu_mmap(struct file *file, struct vm_area_struct *vm) |
f204e0b8 IM |
340 | { |
341 | struct cxl_context *ctx = file->private_data; | |
342 | ||
343 | /* AFU must be started before we can MMIO */ | |
344 | if (ctx->status != STARTED) | |
345 | return -EIO; | |
346 | ||
0d400f77 | 347 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
348 | return -EIO; |
349 | ||
f204e0b8 IM |
350 | return cxl_context_iomap(ctx, vm); |
351 | } | |
352 | ||
b810253b PB |
353 | static inline bool ctx_event_pending(struct cxl_context *ctx) |
354 | { | |
355 | if (ctx->pending_irq || ctx->pending_fault || ctx->pending_afu_err) | |
356 | return true; | |
357 | ||
358 | if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events)) | |
359 | return true; | |
360 | ||
361 | return false; | |
362 | } | |
363 | ||
afc9a42b | 364 | __poll_t afu_poll(struct file *file, struct poll_table_struct *poll) |
f204e0b8 IM |
365 | { |
366 | struct cxl_context *ctx = file->private_data; | |
afc9a42b | 367 | __poll_t mask = 0; |
f204e0b8 IM |
368 | unsigned long flags; |
369 | ||
370 | ||
371 | poll_wait(file, &ctx->wq, poll); | |
372 | ||
373 | pr_devel("afu_poll wait done pe: %i\n", ctx->pe); | |
374 | ||
375 | spin_lock_irqsave(&ctx->lock, flags); | |
b810253b | 376 | if (ctx_event_pending(ctx)) |
a9a08845 | 377 | mask |= EPOLLIN | EPOLLRDNORM; |
f204e0b8 IM |
378 | else if (ctx->status == CLOSED) |
379 | /* Only error on closed when there are no futher events pending | |
380 | */ | |
a9a08845 | 381 | mask |= EPOLLERR; |
f204e0b8 IM |
382 | spin_unlock_irqrestore(&ctx->lock, flags); |
383 | ||
384 | pr_devel("afu_poll pe: %i returning %#x\n", ctx->pe, mask); | |
385 | ||
386 | return mask; | |
387 | } | |
388 | ||
b810253b PB |
389 | static ssize_t afu_driver_event_copy(struct cxl_context *ctx, |
390 | char __user *buf, | |
391 | struct cxl_event *event, | |
392 | struct cxl_event_afu_driver_reserved *pl) | |
f204e0b8 | 393 | { |
b810253b PB |
394 | /* Check event */ |
395 | if (!pl) { | |
396 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL); | |
397 | return -EFAULT; | |
398 | } | |
399 | ||
400 | /* Check event size */ | |
401 | event->header.size += pl->data_size; | |
402 | if (event->header.size > CXL_READ_MIN_SIZE) { | |
403 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL); | |
404 | return -EFAULT; | |
405 | } | |
406 | ||
407 | /* Copy event header */ | |
408 | if (copy_to_user(buf, event, sizeof(struct cxl_event_header))) { | |
409 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT); | |
410 | return -EFAULT; | |
411 | } | |
412 | ||
413 | /* Copy event data */ | |
414 | buf += sizeof(struct cxl_event_header); | |
415 | if (copy_to_user(buf, &pl->data, pl->data_size)) { | |
416 | ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT); | |
417 | return -EFAULT; | |
418 | } | |
419 | ||
420 | ctx->afu_driver_ops->event_delivered(ctx, pl, 0); /* Success */ | |
421 | return event->header.size; | |
f204e0b8 IM |
422 | } |
423 | ||
0520336a | 424 | ssize_t afu_read(struct file *file, char __user *buf, size_t count, |
f204e0b8 IM |
425 | loff_t *off) |
426 | { | |
427 | struct cxl_context *ctx = file->private_data; | |
b810253b | 428 | struct cxl_event_afu_driver_reserved *pl = NULL; |
f204e0b8 IM |
429 | struct cxl_event event; |
430 | unsigned long flags; | |
d53ba6b3 | 431 | int rc; |
f204e0b8 IM |
432 | DEFINE_WAIT(wait); |
433 | ||
0d400f77 | 434 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) |
0b3f9c75 DA |
435 | return -EIO; |
436 | ||
f204e0b8 IM |
437 | if (count < CXL_READ_MIN_SIZE) |
438 | return -EINVAL; | |
439 | ||
440 | spin_lock_irqsave(&ctx->lock, flags); | |
441 | ||
442 | for (;;) { | |
443 | prepare_to_wait(&ctx->wq, &wait, TASK_INTERRUPTIBLE); | |
b810253b | 444 | if (ctx_event_pending(ctx) || (ctx->status == CLOSED)) |
f204e0b8 IM |
445 | break; |
446 | ||
0d400f77 | 447 | if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) { |
0b3f9c75 DA |
448 | rc = -EIO; |
449 | goto out; | |
450 | } | |
451 | ||
d53ba6b3 IM |
452 | if (file->f_flags & O_NONBLOCK) { |
453 | rc = -EAGAIN; | |
454 | goto out; | |
455 | } | |
f204e0b8 | 456 | |
d53ba6b3 IM |
457 | if (signal_pending(current)) { |
458 | rc = -ERESTARTSYS; | |
459 | goto out; | |
460 | } | |
f204e0b8 | 461 | |
d53ba6b3 | 462 | spin_unlock_irqrestore(&ctx->lock, flags); |
f204e0b8 IM |
463 | pr_devel("afu_read going to sleep...\n"); |
464 | schedule(); | |
465 | pr_devel("afu_read woken up\n"); | |
466 | spin_lock_irqsave(&ctx->lock, flags); | |
467 | } | |
468 | ||
469 | finish_wait(&ctx->wq, &wait); | |
470 | ||
471 | memset(&event, 0, sizeof(event)); | |
472 | event.header.process_element = ctx->pe; | |
473 | event.header.size = sizeof(struct cxl_event_header); | |
b810253b PB |
474 | if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events)) { |
475 | pr_devel("afu_read delivering AFU driver specific event\n"); | |
476 | pl = ctx->afu_driver_ops->fetch_event(ctx); | |
477 | atomic_dec(&ctx->afu_driver_events); | |
478 | event.header.type = CXL_EVENT_AFU_DRIVER; | |
479 | } else if (ctx->pending_irq) { | |
f204e0b8 IM |
480 | pr_devel("afu_read delivering AFU interrupt\n"); |
481 | event.header.size += sizeof(struct cxl_event_afu_interrupt); | |
482 | event.header.type = CXL_EVENT_AFU_INTERRUPT; | |
483 | event.irq.irq = find_first_bit(ctx->irq_bitmap, ctx->irq_count) + 1; | |
484 | clear_bit(event.irq.irq - 1, ctx->irq_bitmap); | |
485 | if (bitmap_empty(ctx->irq_bitmap, ctx->irq_count)) | |
486 | ctx->pending_irq = false; | |
487 | } else if (ctx->pending_fault) { | |
488 | pr_devel("afu_read delivering data storage fault\n"); | |
489 | event.header.size += sizeof(struct cxl_event_data_storage); | |
490 | event.header.type = CXL_EVENT_DATA_STORAGE; | |
491 | event.fault.addr = ctx->fault_addr; | |
492 | event.fault.dsisr = ctx->fault_dsisr; | |
493 | ctx->pending_fault = false; | |
494 | } else if (ctx->pending_afu_err) { | |
495 | pr_devel("afu_read delivering afu error\n"); | |
496 | event.header.size += sizeof(struct cxl_event_afu_error); | |
497 | event.header.type = CXL_EVENT_AFU_ERROR; | |
498 | event.afu_error.error = ctx->afu_err; | |
499 | ctx->pending_afu_err = false; | |
500 | } else if (ctx->status == CLOSED) { | |
501 | pr_devel("afu_read fatal error\n"); | |
502 | spin_unlock_irqrestore(&ctx->lock, flags); | |
503 | return -EIO; | |
504 | } else | |
505 | WARN(1, "afu_read must be buggy\n"); | |
506 | ||
507 | spin_unlock_irqrestore(&ctx->lock, flags); | |
508 | ||
b810253b PB |
509 | if (event.header.type == CXL_EVENT_AFU_DRIVER) |
510 | return afu_driver_event_copy(ctx, buf, &event, pl); | |
511 | ||
f204e0b8 IM |
512 | if (copy_to_user(buf, &event, event.header.size)) |
513 | return -EFAULT; | |
514 | return event.header.size; | |
d53ba6b3 IM |
515 | |
516 | out: | |
517 | finish_wait(&ctx->wq, &wait); | |
518 | spin_unlock_irqrestore(&ctx->lock, flags); | |
519 | return rc; | |
f204e0b8 IM |
520 | } |
521 | ||
0520336a MN |
522 | /* |
523 | * Note: if this is updated, we need to update api.c to patch the new ones in | |
524 | * too | |
525 | */ | |
526 | const struct file_operations afu_fops = { | |
f204e0b8 IM |
527 | .owner = THIS_MODULE, |
528 | .open = afu_open, | |
529 | .poll = afu_poll, | |
530 | .read = afu_read, | |
531 | .release = afu_release, | |
532 | .unlocked_ioctl = afu_ioctl, | |
533 | .compat_ioctl = afu_compat_ioctl, | |
534 | .mmap = afu_mmap, | |
535 | }; | |
536 | ||
3d6b040e | 537 | static const struct file_operations afu_master_fops = { |
f204e0b8 IM |
538 | .owner = THIS_MODULE, |
539 | .open = afu_master_open, | |
540 | .poll = afu_poll, | |
541 | .read = afu_read, | |
542 | .release = afu_release, | |
543 | .unlocked_ioctl = afu_ioctl, | |
544 | .compat_ioctl = afu_compat_ioctl, | |
545 | .mmap = afu_mmap, | |
546 | }; | |
547 | ||
548 | ||
549 | static char *cxl_devnode(struct device *dev, umode_t *mode) | |
550 | { | |
594ff7d0 CL |
551 | if (cpu_has_feature(CPU_FTR_HVMODE) && |
552 | CXL_DEVT_IS_CARD(dev->devt)) { | |
f204e0b8 IM |
553 | /* |
554 | * These minor numbers will eventually be used to program the | |
555 | * PSL and AFUs once we have dynamic reprogramming support | |
556 | */ | |
557 | return NULL; | |
558 | } | |
559 | return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev)); | |
560 | } | |
561 | ||
562 | extern struct class *cxl_class; | |
563 | ||
564 | static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev, | |
565 | struct device **chardev, char *postfix, char *desc, | |
566 | const struct file_operations *fops) | |
567 | { | |
568 | struct device *dev; | |
569 | int rc; | |
570 | ||
571 | cdev_init(cdev, fops); | |
572 | if ((rc = cdev_add(cdev, devt, 1))) { | |
573 | dev_err(&afu->dev, "Unable to add %s chardev: %i\n", desc, rc); | |
574 | return rc; | |
575 | } | |
576 | ||
577 | dev = device_create(cxl_class, &afu->dev, devt, afu, | |
578 | "afu%i.%i%s", afu->adapter->adapter_num, afu->slice, postfix); | |
579 | if (IS_ERR(dev)) { | |
580 | dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc); | |
581 | rc = PTR_ERR(dev); | |
582 | goto err; | |
583 | } | |
584 | ||
585 | *chardev = dev; | |
586 | ||
587 | return 0; | |
588 | err: | |
589 | cdev_del(cdev); | |
590 | return rc; | |
591 | } | |
592 | ||
593 | int cxl_chardev_d_afu_add(struct cxl_afu *afu) | |
594 | { | |
595 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_D(afu), &afu->afu_cdev_d, | |
596 | &afu->chardev_d, "d", "dedicated", | |
597 | &afu_master_fops); /* Uses master fops */ | |
598 | } | |
599 | ||
600 | int cxl_chardev_m_afu_add(struct cxl_afu *afu) | |
601 | { | |
602 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_M(afu), &afu->afu_cdev_m, | |
603 | &afu->chardev_m, "m", "master", | |
604 | &afu_master_fops); | |
605 | } | |
606 | ||
607 | int cxl_chardev_s_afu_add(struct cxl_afu *afu) | |
608 | { | |
609 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_S(afu), &afu->afu_cdev_s, | |
610 | &afu->chardev_s, "s", "shared", | |
611 | &afu_fops); | |
612 | } | |
613 | ||
614 | void cxl_chardev_afu_remove(struct cxl_afu *afu) | |
615 | { | |
616 | if (afu->chardev_d) { | |
617 | cdev_del(&afu->afu_cdev_d); | |
618 | device_unregister(afu->chardev_d); | |
619 | afu->chardev_d = NULL; | |
620 | } | |
621 | if (afu->chardev_m) { | |
622 | cdev_del(&afu->afu_cdev_m); | |
623 | device_unregister(afu->chardev_m); | |
624 | afu->chardev_m = NULL; | |
625 | } | |
626 | if (afu->chardev_s) { | |
627 | cdev_del(&afu->afu_cdev_s); | |
628 | device_unregister(afu->chardev_s); | |
629 | afu->chardev_s = NULL; | |
630 | } | |
631 | } | |
632 | ||
633 | int cxl_register_afu(struct cxl_afu *afu) | |
634 | { | |
635 | afu->dev.class = cxl_class; | |
636 | ||
637 | return device_register(&afu->dev); | |
638 | } | |
639 | ||
640 | int cxl_register_adapter(struct cxl *adapter) | |
641 | { | |
642 | adapter->dev.class = cxl_class; | |
643 | ||
644 | /* | |
645 | * Future: When we support dynamically reprogramming the PSL & AFU we | |
646 | * will expose the interface to do that via a chardev: | |
647 | * adapter->dev.devt = CXL_CARD_MKDEV(adapter); | |
648 | */ | |
649 | ||
650 | return device_register(&adapter->dev); | |
651 | } | |
652 | ||
594ff7d0 CL |
653 | dev_t cxl_get_dev(void) |
654 | { | |
655 | return cxl_dev; | |
656 | } | |
657 | ||
f204e0b8 IM |
658 | int __init cxl_file_init(void) |
659 | { | |
660 | int rc; | |
661 | ||
662 | /* | |
663 | * If these change we really need to update API. Either change some | |
664 | * flags or update API version number CXL_API_VERSION. | |
665 | */ | |
b810253b | 666 | BUILD_BUG_ON(CXL_API_VERSION != 3); |
f204e0b8 IM |
667 | BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64); |
668 | BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8); | |
669 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8); | |
670 | BUILD_BUG_ON(sizeof(struct cxl_event_data_storage) != 32); | |
671 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_error) != 16); | |
672 | ||
673 | if ((rc = alloc_chrdev_region(&cxl_dev, 0, CXL_NUM_MINORS, "cxl"))) { | |
674 | pr_err("Unable to allocate CXL major number: %i\n", rc); | |
675 | return rc; | |
676 | } | |
677 | ||
678 | pr_devel("CXL device allocated, MAJOR %i\n", MAJOR(cxl_dev)); | |
679 | ||
680 | cxl_class = class_create(THIS_MODULE, "cxl"); | |
681 | if (IS_ERR(cxl_class)) { | |
682 | pr_err("Unable to create CXL class\n"); | |
683 | rc = PTR_ERR(cxl_class); | |
684 | goto err; | |
685 | } | |
686 | cxl_class->devnode = cxl_devnode; | |
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_destroy(cxl_class); | |
699 | } |