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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2014 IBM Corp.
4 */
5
6#include <linux/pci.h>
7#include <linux/slab.h>
8#include <linux/file.h>
9#include <misc/cxl.h>
10#include <linux/module.h>
11#include <linux/mount.h>
12#include <linux/pseudo_fs.h>
13#include <linux/sched/mm.h>
14#include <linux/mmu_context.h>
15#include <linux/irqdomain.h>
16
17#include "cxl.h"
18
19/*
20 * Since we want to track memory mappings to be able to force-unmap
21 * when the AFU is no longer reachable, we need an inode. For devices
22 * opened through the cxl user API, this is not a problem, but a
23 * userland process can also get a cxl fd through the cxl_get_fd()
24 * API, which is used by the cxlflash driver.
25 *
26 * Therefore we implement our own simple pseudo-filesystem and inode
27 * allocator. We don't use the anonymous inode, as we need the
28 * meta-data associated with it (address_space) and it is shared by
29 * other drivers/processes, so it could lead to cxl unmapping VMAs
30 * from random processes.
31 */
32
33#define CXL_PSEUDO_FS_MAGIC 0x1697697f
34
35static int cxl_fs_cnt;
36static struct vfsmount *cxl_vfs_mount;
37
38static int cxl_fs_init_fs_context(struct fs_context *fc)
39{
40 return init_pseudo(fc, CXL_PSEUDO_FS_MAGIC) ? 0 : -ENOMEM;
41}
42
43static struct file_system_type cxl_fs_type = {
44 .name = "cxl",
45 .owner = THIS_MODULE,
46 .init_fs_context = cxl_fs_init_fs_context,
47 .kill_sb = kill_anon_super,
48};
49
50
51void cxl_release_mapping(struct cxl_context *ctx)
52{
53 if (ctx->kernelapi && ctx->mapping)
54 simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt);
55}
56
57static struct file *cxl_getfile(const char *name,
58 const struct file_operations *fops,
59 void *priv, int flags)
60{
61 struct file *file;
62 struct inode *inode;
63 int rc;
64
65 /* strongly inspired by anon_inode_getfile() */
66
67 if (fops->owner && !try_module_get(fops->owner))
68 return ERR_PTR(-ENOENT);
69
70 rc = simple_pin_fs(&cxl_fs_type, &cxl_vfs_mount, &cxl_fs_cnt);
71 if (rc < 0) {
72 pr_err("Cannot mount cxl pseudo filesystem: %d\n", rc);
73 file = ERR_PTR(rc);
74 goto err_module;
75 }
76
77 inode = alloc_anon_inode(cxl_vfs_mount->mnt_sb);
78 if (IS_ERR(inode)) {
79 file = ERR_CAST(inode);
80 goto err_fs;
81 }
82
83 file = alloc_file_pseudo(inode, cxl_vfs_mount, name,
84 flags & (O_ACCMODE | O_NONBLOCK), fops);
85 if (IS_ERR(file))
86 goto err_inode;
87
88 file->private_data = priv;
89
90 return file;
91
92err_inode:
93 iput(inode);
94err_fs:
95 simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt);
96err_module:
97 module_put(fops->owner);
98 return file;
99}
100
101struct cxl_context *cxl_dev_context_init(struct pci_dev *dev)
102{
103 struct cxl_afu *afu;
104 struct cxl_context *ctx;
105 int rc;
106
107 afu = cxl_pci_to_afu(dev);
108 if (IS_ERR(afu))
109 return ERR_CAST(afu);
110
111 ctx = cxl_context_alloc();
112 if (!ctx)
113 return ERR_PTR(-ENOMEM);
114
115 ctx->kernelapi = true;
116
117 /* Make it a slave context. We can promote it later? */
118 rc = cxl_context_init(ctx, afu, false);
119 if (rc)
120 goto err_ctx;
121
122 return ctx;
123
124err_ctx:
125 kfree(ctx);
126 return ERR_PTR(rc);
127}
128EXPORT_SYMBOL_GPL(cxl_dev_context_init);
129
130struct cxl_context *cxl_get_context(struct pci_dev *dev)
131{
132 return dev->dev.archdata.cxl_ctx;
133}
134EXPORT_SYMBOL_GPL(cxl_get_context);
135
136int cxl_release_context(struct cxl_context *ctx)
137{
138 if (ctx->status >= STARTED)
139 return -EBUSY;
140
141 cxl_context_free(ctx);
142
143 return 0;
144}
145EXPORT_SYMBOL_GPL(cxl_release_context);
146
147static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
148{
149 __u16 range;
150 int r;
151
152 for (r = 0; r < CXL_IRQ_RANGES; r++) {
153 range = ctx->irqs.range[r];
154 if (num < range) {
155 return ctx->irqs.offset[r] + num;
156 }
157 num -= range;
158 }
159 return 0;
160}
161
162
163int cxl_set_priv(struct cxl_context *ctx, void *priv)
164{
165 if (!ctx)
166 return -EINVAL;
167
168 ctx->priv = priv;
169
170 return 0;
171}
172EXPORT_SYMBOL_GPL(cxl_set_priv);
173
174void *cxl_get_priv(struct cxl_context *ctx)
175{
176 if (!ctx)
177 return ERR_PTR(-EINVAL);
178
179 return ctx->priv;
180}
181EXPORT_SYMBOL_GPL(cxl_get_priv);
182
183int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
184{
185 int res;
186 irq_hw_number_t hwirq;
187
188 if (num == 0)
189 num = ctx->afu->pp_irqs;
190 res = afu_allocate_irqs(ctx, num);
191 if (res)
192 return res;
193
194 if (!cpu_has_feature(CPU_FTR_HVMODE)) {
195 /* In a guest, the PSL interrupt is not multiplexed. It was
196 * allocated above, and we need to set its handler
197 */
198 hwirq = cxl_find_afu_irq(ctx, 0);
199 if (hwirq)
200 cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl");
201 }
202
203 if (ctx->status == STARTED) {
204 if (cxl_ops->update_ivtes)
205 cxl_ops->update_ivtes(ctx);
206 else WARN(1, "BUG: cxl_allocate_afu_irqs must be called prior to starting the context on this platform\n");
207 }
208
209 return res;
210}
211EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
212
213void cxl_free_afu_irqs(struct cxl_context *ctx)
214{
215 irq_hw_number_t hwirq;
216 unsigned int virq;
217
218 if (!cpu_has_feature(CPU_FTR_HVMODE)) {
219 hwirq = cxl_find_afu_irq(ctx, 0);
220 if (hwirq) {
221 virq = irq_find_mapping(NULL, hwirq);
222 if (virq)
223 cxl_unmap_irq(virq, ctx);
224 }
225 }
226 afu_irq_name_free(ctx);
227 cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
228}
229EXPORT_SYMBOL_GPL(cxl_free_afu_irqs);
230
231int cxl_map_afu_irq(struct cxl_context *ctx, int num,
232 irq_handler_t handler, void *cookie, char *name)
233{
234 irq_hw_number_t hwirq;
235
236 /*
237 * Find interrupt we are to register.
238 */
239 hwirq = cxl_find_afu_irq(ctx, num);
240 if (!hwirq)
241 return -ENOENT;
242
243 return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name);
244}
245EXPORT_SYMBOL_GPL(cxl_map_afu_irq);
246
247void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie)
248{
249 irq_hw_number_t hwirq;
250 unsigned int virq;
251
252 hwirq = cxl_find_afu_irq(ctx, num);
253 if (!hwirq)
254 return;
255
256 virq = irq_find_mapping(NULL, hwirq);
257 if (virq)
258 cxl_unmap_irq(virq, cookie);
259}
260EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq);
261
262/*
263 * Start a context
264 * Code here similar to afu_ioctl_start_work().
265 */
266int cxl_start_context(struct cxl_context *ctx, u64 wed,
267 struct task_struct *task)
268{
269 int rc = 0;
270 bool kernel = true;
271
272 pr_devel("%s: pe: %i\n", __func__, ctx->pe);
273
274 mutex_lock(&ctx->status_mutex);
275 if (ctx->status == STARTED)
276 goto out; /* already started */
277
278 /*
279 * Increment the mapped context count for adapter. This also checks
280 * if adapter_context_lock is taken.
281 */
282 rc = cxl_adapter_context_get(ctx->afu->adapter);
283 if (rc)
284 goto out;
285
286 if (task) {
287 ctx->pid = get_task_pid(task, PIDTYPE_PID);
288 kernel = false;
289
290 /* acquire a reference to the task's mm */
291 ctx->mm = get_task_mm(current);
292
293 /* ensure this mm_struct can't be freed */
294 cxl_context_mm_count_get(ctx);
295
296 if (ctx->mm) {
297 /* decrement the use count from above */
298 mmput(ctx->mm);
299 /* make TLBIs for this context global */
300 mm_context_add_copro(ctx->mm);
301 }
302 }
303
304 /*
305 * Increment driver use count. Enables global TLBIs for hash
306 * and callbacks to handle the segment table
307 */
308 cxl_ctx_get();
309
310 /* See the comment in afu_ioctl_start_work() */
311 smp_mb();
312
313 if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
314 put_pid(ctx->pid);
315 ctx->pid = NULL;
316 cxl_adapter_context_put(ctx->afu->adapter);
317 cxl_ctx_put();
318 if (task) {
319 cxl_context_mm_count_put(ctx);
320 if (ctx->mm)
321 mm_context_remove_copro(ctx->mm);
322 }
323 goto out;
324 }
325
326 ctx->status = STARTED;
327out:
328 mutex_unlock(&ctx->status_mutex);
329 return rc;
330}
331EXPORT_SYMBOL_GPL(cxl_start_context);
332
333int cxl_process_element(struct cxl_context *ctx)
334{
335 return ctx->external_pe;
336}
337EXPORT_SYMBOL_GPL(cxl_process_element);
338
339/* Stop a context. Returns 0 on success, otherwise -Errno */
340int cxl_stop_context(struct cxl_context *ctx)
341{
342 return __detach_context(ctx);
343}
344EXPORT_SYMBOL_GPL(cxl_stop_context);
345
346void cxl_set_master(struct cxl_context *ctx)
347{
348 ctx->master = true;
349}
350EXPORT_SYMBOL_GPL(cxl_set_master);
351
352/* wrappers around afu_* file ops which are EXPORTED */
353int cxl_fd_open(struct inode *inode, struct file *file)
354{
355 return afu_open(inode, file);
356}
357EXPORT_SYMBOL_GPL(cxl_fd_open);
358int cxl_fd_release(struct inode *inode, struct file *file)
359{
360 return afu_release(inode, file);
361}
362EXPORT_SYMBOL_GPL(cxl_fd_release);
363long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
364{
365 return afu_ioctl(file, cmd, arg);
366}
367EXPORT_SYMBOL_GPL(cxl_fd_ioctl);
368int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm)
369{
370 return afu_mmap(file, vm);
371}
372EXPORT_SYMBOL_GPL(cxl_fd_mmap);
373__poll_t cxl_fd_poll(struct file *file, struct poll_table_struct *poll)
374{
375 return afu_poll(file, poll);
376}
377EXPORT_SYMBOL_GPL(cxl_fd_poll);
378ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count,
379 loff_t *off)
380{
381 return afu_read(file, buf, count, off);
382}
383EXPORT_SYMBOL_GPL(cxl_fd_read);
384
385#define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME
386
387/* Get a struct file and fd for a context and attach the ops */
388struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops,
389 int *fd)
390{
391 struct file *file;
392 int rc, flags, fdtmp;
393 char *name = NULL;
394
395 /* only allow one per context */
396 if (ctx->mapping)
397 return ERR_PTR(-EEXIST);
398
399 flags = O_RDWR | O_CLOEXEC;
400
401 /* This code is similar to anon_inode_getfd() */
402 rc = get_unused_fd_flags(flags);
403 if (rc < 0)
404 return ERR_PTR(rc);
405 fdtmp = rc;
406
407 /*
408 * Patch the file ops. Needs to be careful that this is rentrant safe.
409 */
410 if (fops) {
411 PATCH_FOPS(open);
412 PATCH_FOPS(poll);
413 PATCH_FOPS(read);
414 PATCH_FOPS(release);
415 PATCH_FOPS(unlocked_ioctl);
416 PATCH_FOPS(compat_ioctl);
417 PATCH_FOPS(mmap);
418 } else /* use default ops */
419 fops = (struct file_operations *)&afu_fops;
420
421 name = kasprintf(GFP_KERNEL, "cxl:%d", ctx->pe);
422 file = cxl_getfile(name, fops, ctx, flags);
423 kfree(name);
424 if (IS_ERR(file))
425 goto err_fd;
426
427 cxl_context_set_mapping(ctx, file->f_mapping);
428 *fd = fdtmp;
429 return file;
430
431err_fd:
432 put_unused_fd(fdtmp);
433 return NULL;
434}
435EXPORT_SYMBOL_GPL(cxl_get_fd);
436
437struct cxl_context *cxl_fops_get_context(struct file *file)
438{
439 return file->private_data;
440}
441EXPORT_SYMBOL_GPL(cxl_fops_get_context);
442
443void cxl_set_driver_ops(struct cxl_context *ctx,
444 struct cxl_afu_driver_ops *ops)
445{
446 WARN_ON(!ops->fetch_event || !ops->event_delivered);
447 atomic_set(&ctx->afu_driver_events, 0);
448 ctx->afu_driver_ops = ops;
449}
450EXPORT_SYMBOL_GPL(cxl_set_driver_ops);
451
452void cxl_context_events_pending(struct cxl_context *ctx,
453 unsigned int new_events)
454{
455 atomic_add(new_events, &ctx->afu_driver_events);
456 wake_up_all(&ctx->wq);
457}
458EXPORT_SYMBOL_GPL(cxl_context_events_pending);
459
460int cxl_start_work(struct cxl_context *ctx,
461 struct cxl_ioctl_start_work *work)
462{
463 int rc;
464
465 /* code taken from afu_ioctl_start_work */
466 if (!(work->flags & CXL_START_WORK_NUM_IRQS))
467 work->num_interrupts = ctx->afu->pp_irqs;
468 else if ((work->num_interrupts < ctx->afu->pp_irqs) ||
469 (work->num_interrupts > ctx->afu->irqs_max)) {
470 return -EINVAL;
471 }
472
473 rc = afu_register_irqs(ctx, work->num_interrupts);
474 if (rc)
475 return rc;
476
477 rc = cxl_start_context(ctx, work->work_element_descriptor, current);
478 if (rc < 0) {
479 afu_release_irqs(ctx, ctx);
480 return rc;
481 }
482
483 return 0;
484}
485EXPORT_SYMBOL_GPL(cxl_start_work);
486
487void __iomem *cxl_psa_map(struct cxl_context *ctx)
488{
489 if (ctx->status != STARTED)
490 return NULL;
491
492 pr_devel("%s: psn_phys%llx size:%llx\n",
493 __func__, ctx->psn_phys, ctx->psn_size);
494 return ioremap(ctx->psn_phys, ctx->psn_size);
495}
496EXPORT_SYMBOL_GPL(cxl_psa_map);
497
498void cxl_psa_unmap(void __iomem *addr)
499{
500 iounmap(addr);
501}
502EXPORT_SYMBOL_GPL(cxl_psa_unmap);
503
504int cxl_afu_reset(struct cxl_context *ctx)
505{
506 struct cxl_afu *afu = ctx->afu;
507 int rc;
508
509 rc = cxl_ops->afu_reset(afu);
510 if (rc)
511 return rc;
512
513 return cxl_ops->afu_check_and_enable(afu);
514}
515EXPORT_SYMBOL_GPL(cxl_afu_reset);
516
517void cxl_perst_reloads_same_image(struct cxl_afu *afu,
518 bool perst_reloads_same_image)
519{
520 afu->adapter->perst_same_image = perst_reloads_same_image;
521}
522EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image);
523
524ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count)
525{
526 struct cxl_afu *afu = cxl_pci_to_afu(dev);
527 if (IS_ERR(afu))
528 return -ENODEV;
529
530 return cxl_ops->read_adapter_vpd(afu->adapter, buf, count);
531}
532EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd);
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>
12#include <linux/anon_inodes.h>
13#include <linux/file.h>
14#include <misc/cxl.h>
15#include <linux/fs.h>
16
17#include "cxl.h"
18
19struct cxl_context *cxl_dev_context_init(struct pci_dev *dev)
20{
21 struct address_space *mapping;
22 struct cxl_afu *afu;
23 struct cxl_context *ctx;
24 int rc;
25
26 afu = cxl_pci_to_afu(dev);
27
28 ctx = cxl_context_alloc();
29 if (IS_ERR(ctx)) {
30 rc = PTR_ERR(ctx);
31 goto err_dev;
32 }
33
34 ctx->kernelapi = true;
35
36 /*
37 * Make our own address space since we won't have one from the
38 * filesystem like the user api has, and even if we do associate a file
39 * with this context we don't want to use the global anonymous inode's
40 * address space as that can invalidate unrelated users:
41 */
42 mapping = kmalloc(sizeof(struct address_space), GFP_KERNEL);
43 if (!mapping) {
44 rc = -ENOMEM;
45 goto err_ctx;
46 }
47 address_space_init_once(mapping);
48
49 /* Make it a slave context. We can promote it later? */
50 rc = cxl_context_init(ctx, afu, false, mapping);
51 if (rc)
52 goto err_mapping;
53
54 return ctx;
55
56err_mapping:
57 kfree(mapping);
58err_ctx:
59 kfree(ctx);
60err_dev:
61 return ERR_PTR(rc);
62}
63EXPORT_SYMBOL_GPL(cxl_dev_context_init);
64
65struct cxl_context *cxl_get_context(struct pci_dev *dev)
66{
67 return dev->dev.archdata.cxl_ctx;
68}
69EXPORT_SYMBOL_GPL(cxl_get_context);
70
71struct device *cxl_get_phys_dev(struct pci_dev *dev)
72{
73 struct cxl_afu *afu;
74
75 afu = cxl_pci_to_afu(dev);
76
77 return afu->adapter->dev.parent;
78}
79
80int cxl_release_context(struct cxl_context *ctx)
81{
82 if (ctx->status >= STARTED)
83 return -EBUSY;
84
85 cxl_context_free(ctx);
86
87 return 0;
88}
89EXPORT_SYMBOL_GPL(cxl_release_context);
90
91static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
92{
93 __u16 range;
94 int r;
95
96 for (r = 0; r < CXL_IRQ_RANGES; r++) {
97 range = ctx->irqs.range[r];
98 if (num < range) {
99 return ctx->irqs.offset[r] + num;
100 }
101 num -= range;
102 }
103 return 0;
104}
105
106int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
107{
108 int res;
109 irq_hw_number_t hwirq;
110
111 if (num == 0)
112 num = ctx->afu->pp_irqs;
113 res = afu_allocate_irqs(ctx, num);
114 if (!res && !cpu_has_feature(CPU_FTR_HVMODE)) {
115 /* In a guest, the PSL interrupt is not multiplexed. It was
116 * allocated above, and we need to set its handler
117 */
118 hwirq = cxl_find_afu_irq(ctx, 0);
119 if (hwirq)
120 cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl");
121 }
122 return res;
123}
124EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
125
126void cxl_free_afu_irqs(struct cxl_context *ctx)
127{
128 irq_hw_number_t hwirq;
129 unsigned int virq;
130
131 if (!cpu_has_feature(CPU_FTR_HVMODE)) {
132 hwirq = cxl_find_afu_irq(ctx, 0);
133 if (hwirq) {
134 virq = irq_find_mapping(NULL, hwirq);
135 if (virq)
136 cxl_unmap_irq(virq, ctx);
137 }
138 }
139 afu_irq_name_free(ctx);
140 cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
141}
142EXPORT_SYMBOL_GPL(cxl_free_afu_irqs);
143
144int cxl_map_afu_irq(struct cxl_context *ctx, int num,
145 irq_handler_t handler, void *cookie, char *name)
146{
147 irq_hw_number_t hwirq;
148
149 /*
150 * Find interrupt we are to register.
151 */
152 hwirq = cxl_find_afu_irq(ctx, num);
153 if (!hwirq)
154 return -ENOENT;
155
156 return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name);
157}
158EXPORT_SYMBOL_GPL(cxl_map_afu_irq);
159
160void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie)
161{
162 irq_hw_number_t hwirq;
163 unsigned int virq;
164
165 hwirq = cxl_find_afu_irq(ctx, num);
166 if (!hwirq)
167 return;
168
169 virq = irq_find_mapping(NULL, hwirq);
170 if (virq)
171 cxl_unmap_irq(virq, cookie);
172}
173EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq);
174
175/*
176 * Start a context
177 * Code here similar to afu_ioctl_start_work().
178 */
179int cxl_start_context(struct cxl_context *ctx, u64 wed,
180 struct task_struct *task)
181{
182 int rc = 0;
183 bool kernel = true;
184
185 pr_devel("%s: pe: %i\n", __func__, ctx->pe);
186
187 mutex_lock(&ctx->status_mutex);
188 if (ctx->status == STARTED)
189 goto out; /* already started */
190
191 if (task) {
192 ctx->pid = get_task_pid(task, PIDTYPE_PID);
193 ctx->glpid = get_task_pid(task->group_leader, PIDTYPE_PID);
194 kernel = false;
195 }
196
197 cxl_ctx_get();
198
199 if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
200 put_pid(ctx->pid);
201 cxl_ctx_put();
202 goto out;
203 }
204
205 ctx->status = STARTED;
206out:
207 mutex_unlock(&ctx->status_mutex);
208 return rc;
209}
210EXPORT_SYMBOL_GPL(cxl_start_context);
211
212int cxl_process_element(struct cxl_context *ctx)
213{
214 return ctx->external_pe;
215}
216EXPORT_SYMBOL_GPL(cxl_process_element);
217
218/* Stop a context. Returns 0 on success, otherwise -Errno */
219int cxl_stop_context(struct cxl_context *ctx)
220{
221 return __detach_context(ctx);
222}
223EXPORT_SYMBOL_GPL(cxl_stop_context);
224
225void cxl_set_master(struct cxl_context *ctx)
226{
227 ctx->master = true;
228}
229EXPORT_SYMBOL_GPL(cxl_set_master);
230
231/* wrappers around afu_* file ops which are EXPORTED */
232int cxl_fd_open(struct inode *inode, struct file *file)
233{
234 return afu_open(inode, file);
235}
236EXPORT_SYMBOL_GPL(cxl_fd_open);
237int cxl_fd_release(struct inode *inode, struct file *file)
238{
239 return afu_release(inode, file);
240}
241EXPORT_SYMBOL_GPL(cxl_fd_release);
242long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
243{
244 return afu_ioctl(file, cmd, arg);
245}
246EXPORT_SYMBOL_GPL(cxl_fd_ioctl);
247int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm)
248{
249 return afu_mmap(file, vm);
250}
251EXPORT_SYMBOL_GPL(cxl_fd_mmap);
252unsigned int cxl_fd_poll(struct file *file, struct poll_table_struct *poll)
253{
254 return afu_poll(file, poll);
255}
256EXPORT_SYMBOL_GPL(cxl_fd_poll);
257ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count,
258 loff_t *off)
259{
260 return afu_read(file, buf, count, off);
261}
262EXPORT_SYMBOL_GPL(cxl_fd_read);
263
264#define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME
265
266/* Get a struct file and fd for a context and attach the ops */
267struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops,
268 int *fd)
269{
270 struct file *file;
271 int rc, flags, fdtmp;
272
273 flags = O_RDWR | O_CLOEXEC;
274
275 /* This code is similar to anon_inode_getfd() */
276 rc = get_unused_fd_flags(flags);
277 if (rc < 0)
278 return ERR_PTR(rc);
279 fdtmp = rc;
280
281 /*
282 * Patch the file ops. Needs to be careful that this is rentrant safe.
283 */
284 if (fops) {
285 PATCH_FOPS(open);
286 PATCH_FOPS(poll);
287 PATCH_FOPS(read);
288 PATCH_FOPS(release);
289 PATCH_FOPS(unlocked_ioctl);
290 PATCH_FOPS(compat_ioctl);
291 PATCH_FOPS(mmap);
292 } else /* use default ops */
293 fops = (struct file_operations *)&afu_fops;
294
295 file = anon_inode_getfile("cxl", fops, ctx, flags);
296 if (IS_ERR(file))
297 goto err_fd;
298
299 file->f_mapping = ctx->mapping;
300
301 *fd = fdtmp;
302 return file;
303
304err_fd:
305 put_unused_fd(fdtmp);
306 return NULL;
307}
308EXPORT_SYMBOL_GPL(cxl_get_fd);
309
310struct cxl_context *cxl_fops_get_context(struct file *file)
311{
312 return file->private_data;
313}
314EXPORT_SYMBOL_GPL(cxl_fops_get_context);
315
316int cxl_start_work(struct cxl_context *ctx,
317 struct cxl_ioctl_start_work *work)
318{
319 int rc;
320
321 /* code taken from afu_ioctl_start_work */
322 if (!(work->flags & CXL_START_WORK_NUM_IRQS))
323 work->num_interrupts = ctx->afu->pp_irqs;
324 else if ((work->num_interrupts < ctx->afu->pp_irqs) ||
325 (work->num_interrupts > ctx->afu->irqs_max)) {
326 return -EINVAL;
327 }
328
329 rc = afu_register_irqs(ctx, work->num_interrupts);
330 if (rc)
331 return rc;
332
333 rc = cxl_start_context(ctx, work->work_element_descriptor, current);
334 if (rc < 0) {
335 afu_release_irqs(ctx, ctx);
336 return rc;
337 }
338
339 return 0;
340}
341EXPORT_SYMBOL_GPL(cxl_start_work);
342
343void __iomem *cxl_psa_map(struct cxl_context *ctx)
344{
345 if (ctx->status != STARTED)
346 return NULL;
347
348 pr_devel("%s: psn_phys%llx size:%llx\n",
349 __func__, ctx->psn_phys, ctx->psn_size);
350 return ioremap(ctx->psn_phys, ctx->psn_size);
351}
352EXPORT_SYMBOL_GPL(cxl_psa_map);
353
354void cxl_psa_unmap(void __iomem *addr)
355{
356 iounmap(addr);
357}
358EXPORT_SYMBOL_GPL(cxl_psa_unmap);
359
360int cxl_afu_reset(struct cxl_context *ctx)
361{
362 struct cxl_afu *afu = ctx->afu;
363 int rc;
364
365 rc = cxl_ops->afu_reset(afu);
366 if (rc)
367 return rc;
368
369 return cxl_ops->afu_check_and_enable(afu);
370}
371EXPORT_SYMBOL_GPL(cxl_afu_reset);
372
373void cxl_perst_reloads_same_image(struct cxl_afu *afu,
374 bool perst_reloads_same_image)
375{
376 afu->adapter->perst_same_image = perst_reloads_same_image;
377}
378EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image);
379
380ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count)
381{
382 struct cxl_afu *afu = cxl_pci_to_afu(dev);
383
384 return cxl_ops->read_adapter_vpd(afu->adapter, buf, count);
385}
386EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd);