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Commit | Line | Data |
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6f7f0b3d MN |
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/pci.h> | |
11 | #include <linux/slab.h> | |
6f7f0b3d MN |
12 | #include <linux/file.h> |
13 | #include <misc/cxl.h> | |
a2f67d5e | 14 | #include <linux/msi.h> |
bdecf76e FB |
15 | #include <linux/module.h> |
16 | #include <linux/mount.h> | |
6dd2d234 | 17 | #include <linux/sched/mm.h> |
03b8abed | 18 | #include <linux/mmu_context.h> |
6f7f0b3d MN |
19 | |
20 | #include "cxl.h" | |
21 | ||
bdecf76e FB |
22 | /* |
23 | * Since we want to track memory mappings to be able to force-unmap | |
24 | * when the AFU is no longer reachable, we need an inode. For devices | |
25 | * opened through the cxl user API, this is not a problem, but a | |
26 | * userland process can also get a cxl fd through the cxl_get_fd() | |
27 | * API, which is used by the cxlflash driver. | |
28 | * | |
29 | * Therefore we implement our own simple pseudo-filesystem and inode | |
30 | * allocator. We don't use the anonymous inode, as we need the | |
31 | * meta-data associated with it (address_space) and it is shared by | |
32 | * other drivers/processes, so it could lead to cxl unmapping VMAs | |
33 | * from random processes. | |
34 | */ | |
35 | ||
36 | #define CXL_PSEUDO_FS_MAGIC 0x1697697f | |
37 | ||
38 | static int cxl_fs_cnt; | |
39 | static struct vfsmount *cxl_vfs_mount; | |
40 | ||
41 | static const struct dentry_operations cxl_fs_dops = { | |
42 | .d_dname = simple_dname, | |
43 | }; | |
44 | ||
45 | static struct dentry *cxl_fs_mount(struct file_system_type *fs_type, int flags, | |
46 | const char *dev_name, void *data) | |
47 | { | |
48 | return mount_pseudo(fs_type, "cxl:", NULL, &cxl_fs_dops, | |
49 | CXL_PSEUDO_FS_MAGIC); | |
50 | } | |
51 | ||
52 | static struct file_system_type cxl_fs_type = { | |
53 | .name = "cxl", | |
54 | .owner = THIS_MODULE, | |
55 | .mount = cxl_fs_mount, | |
56 | .kill_sb = kill_anon_super, | |
57 | }; | |
58 | ||
59 | ||
60 | void cxl_release_mapping(struct cxl_context *ctx) | |
61 | { | |
62 | if (ctx->kernelapi && ctx->mapping) | |
63 | simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt); | |
64 | } | |
65 | ||
66 | static struct file *cxl_getfile(const char *name, | |
67 | const struct file_operations *fops, | |
68 | void *priv, int flags) | |
69 | { | |
70 | struct qstr this; | |
71 | struct path path; | |
72 | struct file *file; | |
73 | struct inode *inode = NULL; | |
74 | int rc; | |
75 | ||
76 | /* strongly inspired by anon_inode_getfile() */ | |
77 | ||
78 | if (fops->owner && !try_module_get(fops->owner)) | |
79 | return ERR_PTR(-ENOENT); | |
80 | ||
81 | rc = simple_pin_fs(&cxl_fs_type, &cxl_vfs_mount, &cxl_fs_cnt); | |
82 | if (rc < 0) { | |
83 | pr_err("Cannot mount cxl pseudo filesystem: %d\n", rc); | |
84 | file = ERR_PTR(rc); | |
85 | goto err_module; | |
86 | } | |
87 | ||
88 | inode = alloc_anon_inode(cxl_vfs_mount->mnt_sb); | |
89 | if (IS_ERR(inode)) { | |
90 | file = ERR_CAST(inode); | |
91 | goto err_fs; | |
92 | } | |
93 | ||
94 | file = ERR_PTR(-ENOMEM); | |
95 | this.name = name; | |
96 | this.len = strlen(name); | |
97 | this.hash = 0; | |
98 | path.dentry = d_alloc_pseudo(cxl_vfs_mount->mnt_sb, &this); | |
99 | if (!path.dentry) | |
100 | goto err_inode; | |
101 | ||
102 | path.mnt = mntget(cxl_vfs_mount); | |
103 | d_instantiate(path.dentry, inode); | |
104 | ||
105 | file = alloc_file(&path, OPEN_FMODE(flags), fops); | |
106 | if (IS_ERR(file)) | |
107 | goto err_dput; | |
108 | file->f_flags = flags & (O_ACCMODE | O_NONBLOCK); | |
109 | file->private_data = priv; | |
110 | ||
111 | return file; | |
112 | ||
113 | err_dput: | |
114 | path_put(&path); | |
115 | err_inode: | |
116 | iput(inode); | |
117 | err_fs: | |
118 | simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt); | |
119 | err_module: | |
120 | module_put(fops->owner); | |
121 | return file; | |
122 | } | |
123 | ||
6f7f0b3d MN |
124 | struct cxl_context *cxl_dev_context_init(struct pci_dev *dev) |
125 | { | |
126 | struct cxl_afu *afu; | |
127 | struct cxl_context *ctx; | |
128 | int rc; | |
129 | ||
130 | afu = cxl_pci_to_afu(dev); | |
317f5ef1 IM |
131 | if (IS_ERR(afu)) |
132 | return ERR_CAST(afu); | |
6f7f0b3d MN |
133 | |
134 | ctx = cxl_context_alloc(); | |
5cd4f5ce CJ |
135 | if (!ctx) |
136 | return ERR_PTR(-ENOMEM); | |
6f7f0b3d | 137 | |
55e07668 IM |
138 | ctx->kernelapi = true; |
139 | ||
6f7f0b3d | 140 | /* Make it a slave context. We can promote it later? */ |
bdecf76e | 141 | rc = cxl_context_init(ctx, afu, false); |
af2a50bb | 142 | if (rc) |
bdecf76e | 143 | goto err_ctx; |
55e07668 | 144 | |
6f7f0b3d | 145 | return ctx; |
af2a50bb IM |
146 | |
147 | err_ctx: | |
148 | kfree(ctx); | |
af2a50bb | 149 | return ERR_PTR(rc); |
6f7f0b3d MN |
150 | } |
151 | EXPORT_SYMBOL_GPL(cxl_dev_context_init); | |
152 | ||
153 | struct cxl_context *cxl_get_context(struct pci_dev *dev) | |
154 | { | |
155 | return dev->dev.archdata.cxl_ctx; | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(cxl_get_context); | |
158 | ||
6f7f0b3d MN |
159 | int cxl_release_context(struct cxl_context *ctx) |
160 | { | |
7c26b9cf | 161 | if (ctx->status >= STARTED) |
6f7f0b3d MN |
162 | return -EBUSY; |
163 | ||
164 | cxl_context_free(ctx); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(cxl_release_context); | |
169 | ||
6f7f0b3d MN |
170 | static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num) |
171 | { | |
172 | __u16 range; | |
173 | int r; | |
174 | ||
6f7f0b3d MN |
175 | for (r = 0; r < CXL_IRQ_RANGES; r++) { |
176 | range = ctx->irqs.range[r]; | |
177 | if (num < range) { | |
178 | return ctx->irqs.offset[r] + num; | |
179 | } | |
180 | num -= range; | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
cbce0917 IM |
185 | int _cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq) |
186 | { | |
187 | if (*ctx == NULL || *afu_irq == 0) { | |
188 | *afu_irq = 1; | |
189 | *ctx = cxl_get_context(pdev); | |
190 | } else { | |
191 | (*afu_irq)++; | |
192 | if (*afu_irq > cxl_get_max_irqs_per_process(pdev)) { | |
193 | *ctx = list_next_entry(*ctx, extra_irq_contexts); | |
194 | *afu_irq = 1; | |
195 | } | |
196 | } | |
197 | return cxl_find_afu_irq(*ctx, *afu_irq); | |
198 | } | |
199 | /* Exported via cxl_base */ | |
ad42de85 MN |
200 | |
201 | int cxl_set_priv(struct cxl_context *ctx, void *priv) | |
202 | { | |
203 | if (!ctx) | |
204 | return -EINVAL; | |
205 | ||
206 | ctx->priv = priv; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | EXPORT_SYMBOL_GPL(cxl_set_priv); | |
211 | ||
212 | void *cxl_get_priv(struct cxl_context *ctx) | |
213 | { | |
214 | if (!ctx) | |
215 | return ERR_PTR(-EINVAL); | |
216 | ||
217 | return ctx->priv; | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(cxl_get_priv); | |
220 | ||
d601ea91 FB |
221 | int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num) |
222 | { | |
223 | int res; | |
224 | irq_hw_number_t hwirq; | |
225 | ||
226 | if (num == 0) | |
227 | num = ctx->afu->pp_irqs; | |
228 | res = afu_allocate_irqs(ctx, num); | |
292841b0 IM |
229 | if (res) |
230 | return res; | |
231 | ||
232 | if (!cpu_has_feature(CPU_FTR_HVMODE)) { | |
d601ea91 FB |
233 | /* In a guest, the PSL interrupt is not multiplexed. It was |
234 | * allocated above, and we need to set its handler | |
235 | */ | |
236 | hwirq = cxl_find_afu_irq(ctx, 0); | |
237 | if (hwirq) | |
238 | cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl"); | |
239 | } | |
292841b0 IM |
240 | |
241 | if (ctx->status == STARTED) { | |
242 | if (cxl_ops->update_ivtes) | |
243 | cxl_ops->update_ivtes(ctx); | |
244 | else WARN(1, "BUG: cxl_allocate_afu_irqs must be called prior to starting the context on this platform\n"); | |
245 | } | |
246 | ||
d601ea91 FB |
247 | return res; |
248 | } | |
249 | EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs); | |
250 | ||
251 | void cxl_free_afu_irqs(struct cxl_context *ctx) | |
252 | { | |
253 | irq_hw_number_t hwirq; | |
254 | unsigned int virq; | |
255 | ||
256 | if (!cpu_has_feature(CPU_FTR_HVMODE)) { | |
257 | hwirq = cxl_find_afu_irq(ctx, 0); | |
258 | if (hwirq) { | |
259 | virq = irq_find_mapping(NULL, hwirq); | |
260 | if (virq) | |
261 | cxl_unmap_irq(virq, ctx); | |
262 | } | |
263 | } | |
264 | afu_irq_name_free(ctx); | |
265 | cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter); | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(cxl_free_afu_irqs); | |
268 | ||
6f7f0b3d MN |
269 | int cxl_map_afu_irq(struct cxl_context *ctx, int num, |
270 | irq_handler_t handler, void *cookie, char *name) | |
271 | { | |
272 | irq_hw_number_t hwirq; | |
273 | ||
274 | /* | |
275 | * Find interrupt we are to register. | |
276 | */ | |
277 | hwirq = cxl_find_afu_irq(ctx, num); | |
278 | if (!hwirq) | |
279 | return -ENOENT; | |
280 | ||
281 | return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name); | |
282 | } | |
283 | EXPORT_SYMBOL_GPL(cxl_map_afu_irq); | |
284 | ||
285 | void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie) | |
286 | { | |
287 | irq_hw_number_t hwirq; | |
288 | unsigned int virq; | |
289 | ||
290 | hwirq = cxl_find_afu_irq(ctx, num); | |
291 | if (!hwirq) | |
292 | return; | |
293 | ||
294 | virq = irq_find_mapping(NULL, hwirq); | |
295 | if (virq) | |
296 | cxl_unmap_irq(virq, cookie); | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq); | |
299 | ||
300 | /* | |
301 | * Start a context | |
302 | * Code here similar to afu_ioctl_start_work(). | |
303 | */ | |
304 | int cxl_start_context(struct cxl_context *ctx, u64 wed, | |
305 | struct task_struct *task) | |
306 | { | |
307 | int rc = 0; | |
308 | bool kernel = true; | |
309 | ||
310 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); | |
311 | ||
312 | mutex_lock(&ctx->status_mutex); | |
313 | if (ctx->status == STARTED) | |
314 | goto out; /* already started */ | |
315 | ||
70b565bb VJ |
316 | /* |
317 | * Increment the mapped context count for adapter. This also checks | |
318 | * if adapter_context_lock is taken. | |
319 | */ | |
320 | rc = cxl_adapter_context_get(ctx->afu->adapter); | |
321 | if (rc) | |
322 | goto out; | |
323 | ||
6f7f0b3d MN |
324 | if (task) { |
325 | ctx->pid = get_task_pid(task, PIDTYPE_PID); | |
6f7f0b3d | 326 | kernel = false; |
7a0d85d3 | 327 | ctx->real_mode = false; |
6dd2d234 CL |
328 | |
329 | /* acquire a reference to the task's mm */ | |
330 | ctx->mm = get_task_mm(current); | |
331 | ||
332 | /* ensure this mm_struct can't be freed */ | |
333 | cxl_context_mm_count_get(ctx); | |
334 | ||
03b8abed FB |
335 | if (ctx->mm) { |
336 | /* decrement the use count from above */ | |
6dd2d234 | 337 | mmput(ctx->mm); |
03b8abed FB |
338 | /* make TLBIs for this context global */ |
339 | mm_context_add_copro(ctx->mm); | |
340 | } | |
6f7f0b3d MN |
341 | } |
342 | ||
197267d0 FB |
343 | /* |
344 | * Increment driver use count. Enables global TLBIs for hash | |
345 | * and callbacks to handle the segment table | |
346 | */ | |
6f7f0b3d MN |
347 | cxl_ctx_get(); |
348 | ||
03b8abed FB |
349 | /* See the comment in afu_ioctl_start_work() */ |
350 | smp_mb(); | |
351 | ||
5be587b1 | 352 | if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) { |
6f7f0b3d | 353 | put_pid(ctx->pid); |
6dd2d234 | 354 | ctx->pid = NULL; |
70b565bb | 355 | cxl_adapter_context_put(ctx->afu->adapter); |
6f7f0b3d | 356 | cxl_ctx_put(); |
03b8abed | 357 | if (task) { |
6dd2d234 | 358 | cxl_context_mm_count_put(ctx); |
03b8abed FB |
359 | if (ctx->mm) |
360 | mm_context_remove_copro(ctx->mm); | |
361 | } | |
6f7f0b3d MN |
362 | goto out; |
363 | } | |
364 | ||
365 | ctx->status = STARTED; | |
6f7f0b3d MN |
366 | out: |
367 | mutex_unlock(&ctx->status_mutex); | |
368 | return rc; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(cxl_start_context); | |
371 | ||
372 | int cxl_process_element(struct cxl_context *ctx) | |
373 | { | |
14baf4d9 | 374 | return ctx->external_pe; |
6f7f0b3d MN |
375 | } |
376 | EXPORT_SYMBOL_GPL(cxl_process_element); | |
377 | ||
378 | /* Stop a context. Returns 0 on success, otherwise -Errno */ | |
379 | int cxl_stop_context(struct cxl_context *ctx) | |
380 | { | |
3f8dc44d | 381 | return __detach_context(ctx); |
6f7f0b3d MN |
382 | } |
383 | EXPORT_SYMBOL_GPL(cxl_stop_context); | |
384 | ||
385 | void cxl_set_master(struct cxl_context *ctx) | |
386 | { | |
387 | ctx->master = true; | |
6f7f0b3d MN |
388 | } |
389 | EXPORT_SYMBOL_GPL(cxl_set_master); | |
390 | ||
7a0d85d3 IM |
391 | int cxl_set_translation_mode(struct cxl_context *ctx, bool real_mode) |
392 | { | |
393 | if (ctx->status == STARTED) { | |
394 | /* | |
395 | * We could potentially update the PE and issue an update LLCMD | |
396 | * to support this, but it doesn't seem to have a good use case | |
397 | * since it's trivial to just create a second kernel context | |
398 | * with different translation modes, so until someone convinces | |
399 | * me otherwise: | |
400 | */ | |
401 | return -EBUSY; | |
402 | } | |
403 | ||
404 | ctx->real_mode = real_mode; | |
405 | return 0; | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(cxl_set_translation_mode); | |
408 | ||
6f7f0b3d MN |
409 | /* wrappers around afu_* file ops which are EXPORTED */ |
410 | int cxl_fd_open(struct inode *inode, struct file *file) | |
411 | { | |
412 | return afu_open(inode, file); | |
413 | } | |
414 | EXPORT_SYMBOL_GPL(cxl_fd_open); | |
415 | int cxl_fd_release(struct inode *inode, struct file *file) | |
416 | { | |
417 | return afu_release(inode, file); | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(cxl_fd_release); | |
420 | long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
421 | { | |
422 | return afu_ioctl(file, cmd, arg); | |
423 | } | |
424 | EXPORT_SYMBOL_GPL(cxl_fd_ioctl); | |
425 | int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm) | |
426 | { | |
427 | return afu_mmap(file, vm); | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(cxl_fd_mmap); | |
430 | unsigned int cxl_fd_poll(struct file *file, struct poll_table_struct *poll) | |
431 | { | |
432 | return afu_poll(file, poll); | |
433 | } | |
434 | EXPORT_SYMBOL_GPL(cxl_fd_poll); | |
435 | ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count, | |
436 | loff_t *off) | |
437 | { | |
438 | return afu_read(file, buf, count, off); | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(cxl_fd_read); | |
441 | ||
442 | #define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME | |
443 | ||
444 | /* Get a struct file and fd for a context and attach the ops */ | |
445 | struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops, | |
446 | int *fd) | |
447 | { | |
448 | struct file *file; | |
449 | int rc, flags, fdtmp; | |
bdecf76e FB |
450 | char *name = NULL; |
451 | ||
452 | /* only allow one per context */ | |
453 | if (ctx->mapping) | |
454 | return ERR_PTR(-EEXIST); | |
6f7f0b3d MN |
455 | |
456 | flags = O_RDWR | O_CLOEXEC; | |
457 | ||
458 | /* This code is similar to anon_inode_getfd() */ | |
459 | rc = get_unused_fd_flags(flags); | |
460 | if (rc < 0) | |
461 | return ERR_PTR(rc); | |
462 | fdtmp = rc; | |
463 | ||
464 | /* | |
465 | * Patch the file ops. Needs to be careful that this is rentrant safe. | |
466 | */ | |
467 | if (fops) { | |
468 | PATCH_FOPS(open); | |
469 | PATCH_FOPS(poll); | |
470 | PATCH_FOPS(read); | |
471 | PATCH_FOPS(release); | |
472 | PATCH_FOPS(unlocked_ioctl); | |
473 | PATCH_FOPS(compat_ioctl); | |
474 | PATCH_FOPS(mmap); | |
475 | } else /* use default ops */ | |
476 | fops = (struct file_operations *)&afu_fops; | |
477 | ||
bdecf76e FB |
478 | name = kasprintf(GFP_KERNEL, "cxl:%d", ctx->pe); |
479 | file = cxl_getfile(name, fops, ctx, flags); | |
480 | kfree(name); | |
6f7f0b3d | 481 | if (IS_ERR(file)) |
55e07668 IM |
482 | goto err_fd; |
483 | ||
bdecf76e | 484 | cxl_context_set_mapping(ctx, file->f_mapping); |
6f7f0b3d MN |
485 | *fd = fdtmp; |
486 | return file; | |
55e07668 IM |
487 | |
488 | err_fd: | |
489 | put_unused_fd(fdtmp); | |
490 | return NULL; | |
6f7f0b3d MN |
491 | } |
492 | EXPORT_SYMBOL_GPL(cxl_get_fd); | |
493 | ||
494 | struct cxl_context *cxl_fops_get_context(struct file *file) | |
495 | { | |
496 | return file->private_data; | |
497 | } | |
498 | EXPORT_SYMBOL_GPL(cxl_fops_get_context); | |
499 | ||
b810253b PB |
500 | void cxl_set_driver_ops(struct cxl_context *ctx, |
501 | struct cxl_afu_driver_ops *ops) | |
502 | { | |
503 | WARN_ON(!ops->fetch_event || !ops->event_delivered); | |
504 | atomic_set(&ctx->afu_driver_events, 0); | |
505 | ctx->afu_driver_ops = ops; | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(cxl_set_driver_ops); | |
508 | ||
509 | void cxl_context_events_pending(struct cxl_context *ctx, | |
510 | unsigned int new_events) | |
511 | { | |
512 | atomic_add(new_events, &ctx->afu_driver_events); | |
513 | wake_up_all(&ctx->wq); | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(cxl_context_events_pending); | |
516 | ||
6f7f0b3d MN |
517 | int cxl_start_work(struct cxl_context *ctx, |
518 | struct cxl_ioctl_start_work *work) | |
519 | { | |
520 | int rc; | |
521 | ||
522 | /* code taken from afu_ioctl_start_work */ | |
523 | if (!(work->flags & CXL_START_WORK_NUM_IRQS)) | |
524 | work->num_interrupts = ctx->afu->pp_irqs; | |
525 | else if ((work->num_interrupts < ctx->afu->pp_irqs) || | |
526 | (work->num_interrupts > ctx->afu->irqs_max)) { | |
527 | return -EINVAL; | |
528 | } | |
529 | ||
530 | rc = afu_register_irqs(ctx, work->num_interrupts); | |
531 | if (rc) | |
532 | return rc; | |
533 | ||
534 | rc = cxl_start_context(ctx, work->work_element_descriptor, current); | |
535 | if (rc < 0) { | |
536 | afu_release_irqs(ctx, ctx); | |
537 | return rc; | |
538 | } | |
539 | ||
540 | return 0; | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(cxl_start_work); | |
543 | ||
544 | void __iomem *cxl_psa_map(struct cxl_context *ctx) | |
545 | { | |
cca44c01 | 546 | if (ctx->status != STARTED) |
6f7f0b3d MN |
547 | return NULL; |
548 | ||
549 | pr_devel("%s: psn_phys%llx size:%llx\n", | |
cca44c01 | 550 | __func__, ctx->psn_phys, ctx->psn_size); |
6f7f0b3d MN |
551 | return ioremap(ctx->psn_phys, ctx->psn_size); |
552 | } | |
553 | EXPORT_SYMBOL_GPL(cxl_psa_map); | |
554 | ||
555 | void cxl_psa_unmap(void __iomem *addr) | |
556 | { | |
557 | iounmap(addr); | |
558 | } | |
559 | EXPORT_SYMBOL_GPL(cxl_psa_unmap); | |
560 | ||
561 | int cxl_afu_reset(struct cxl_context *ctx) | |
562 | { | |
563 | struct cxl_afu *afu = ctx->afu; | |
564 | int rc; | |
565 | ||
5be587b1 | 566 | rc = cxl_ops->afu_reset(afu); |
6f7f0b3d MN |
567 | if (rc) |
568 | return rc; | |
569 | ||
5be587b1 | 570 | return cxl_ops->afu_check_and_enable(afu); |
6f7f0b3d MN |
571 | } |
572 | EXPORT_SYMBOL_GPL(cxl_afu_reset); | |
13e68d8b DA |
573 | |
574 | void cxl_perst_reloads_same_image(struct cxl_afu *afu, | |
575 | bool perst_reloads_same_image) | |
576 | { | |
577 | afu->adapter->perst_same_image = perst_reloads_same_image; | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image); | |
d601ea91 FB |
580 | |
581 | ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count) | |
582 | { | |
583 | struct cxl_afu *afu = cxl_pci_to_afu(dev); | |
317f5ef1 IM |
584 | if (IS_ERR(afu)) |
585 | return -ENODEV; | |
d601ea91 FB |
586 | |
587 | return cxl_ops->read_adapter_vpd(afu->adapter, buf, count); | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd); | |
79384e4b IM |
590 | |
591 | int cxl_set_max_irqs_per_process(struct pci_dev *dev, int irqs) | |
592 | { | |
593 | struct cxl_afu *afu = cxl_pci_to_afu(dev); | |
594 | if (IS_ERR(afu)) | |
595 | return -ENODEV; | |
596 | ||
597 | if (irqs > afu->adapter->user_irqs) | |
598 | return -EINVAL; | |
599 | ||
600 | /* Limit user_irqs to prevent the user increasing this via sysfs */ | |
601 | afu->adapter->user_irqs = irqs; | |
602 | afu->irqs_max = irqs; | |
603 | ||
604 | return 0; | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(cxl_set_max_irqs_per_process); | |
607 | ||
608 | int cxl_get_max_irqs_per_process(struct pci_dev *dev) | |
609 | { | |
610 | struct cxl_afu *afu = cxl_pci_to_afu(dev); | |
611 | if (IS_ERR(afu)) | |
612 | return -ENODEV; | |
613 | ||
614 | return afu->irqs_max; | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(cxl_get_max_irqs_per_process); | |
a2f67d5e IM |
617 | |
618 | /* | |
619 | * This is a special interrupt allocation routine called from the PHB's MSI | |
620 | * setup function. When capi interrupts are allocated in this manner they must | |
621 | * still be associated with a running context, but since the MSI APIs have no | |
622 | * way to specify this we use the default context associated with the device. | |
623 | * | |
624 | * The Mellanox CX4 has a hardware limitation that restricts the maximum AFU | |
625 | * interrupt number, so in order to overcome this their driver informs us of | |
626 | * the restriction by setting the maximum interrupts per context, and we | |
627 | * allocate additional contexts as necessary so that we can keep the AFU | |
628 | * interrupt number within the supported range. | |
629 | */ | |
630 | int _cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) | |
631 | { | |
632 | struct cxl_context *ctx, *new_ctx, *default_ctx; | |
633 | int remaining; | |
634 | int rc; | |
635 | ||
636 | ctx = default_ctx = cxl_get_context(pdev); | |
637 | if (WARN_ON(!default_ctx)) | |
638 | return -ENODEV; | |
639 | ||
640 | remaining = nvec; | |
641 | while (remaining > 0) { | |
642 | rc = cxl_allocate_afu_irqs(ctx, min(remaining, ctx->afu->irqs_max)); | |
643 | if (rc) { | |
644 | pr_warn("%s: Failed to find enough free MSIs\n", pci_name(pdev)); | |
645 | return rc; | |
646 | } | |
647 | remaining -= ctx->afu->irqs_max; | |
648 | ||
649 | if (ctx != default_ctx && default_ctx->status == STARTED) { | |
650 | WARN_ON(cxl_start_context(ctx, | |
651 | be64_to_cpu(default_ctx->elem->common.wed), | |
652 | NULL)); | |
653 | } | |
654 | ||
655 | if (remaining > 0) { | |
656 | new_ctx = cxl_dev_context_init(pdev); | |
28e323e5 | 657 | if (IS_ERR(new_ctx)) { |
a2f67d5e IM |
658 | pr_warn("%s: Failed to allocate enough contexts for MSIs\n", pci_name(pdev)); |
659 | return -ENOSPC; | |
660 | } | |
661 | list_add(&new_ctx->extra_irq_contexts, &ctx->extra_irq_contexts); | |
662 | ctx = new_ctx; | |
663 | } | |
664 | } | |
665 | ||
666 | return 0; | |
667 | } | |
668 | /* Exported via cxl_base */ | |
669 | ||
670 | void _cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev) | |
671 | { | |
672 | struct cxl_context *ctx, *pos, *tmp; | |
673 | ||
674 | ctx = cxl_get_context(pdev); | |
675 | if (WARN_ON(!ctx)) | |
676 | return; | |
677 | ||
678 | cxl_free_afu_irqs(ctx); | |
679 | list_for_each_entry_safe(pos, tmp, &ctx->extra_irq_contexts, extra_irq_contexts) { | |
680 | cxl_stop_context(pos); | |
681 | cxl_free_afu_irqs(pos); | |
682 | list_del(&pos->extra_irq_contexts); | |
683 | cxl_release_context(pos); | |
684 | } | |
685 | } | |
686 | /* Exported via cxl_base */ |