Commit | Line | Data |
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fce8a7bb JM |
1 | /* |
2 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
3 | * redistributing this file, you may do so under either license. | |
4 | * | |
5 | * GPL LICENSE SUMMARY | |
6 | * | |
7 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
e26a5843 | 8 | * Copyright (C) 2015 EMC Corporation. All Rights Reserved. |
fce8a7bb JM |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of version 2 of the GNU General Public License as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * BSD LICENSE | |
15 | * | |
16 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
e26a5843 | 17 | * Copyright (C) 2015 EMC Corporation. All Rights Reserved. |
fce8a7bb JM |
18 | * |
19 | * Redistribution and use in source and binary forms, with or without | |
20 | * modification, are permitted provided that the following conditions | |
21 | * are met: | |
22 | * | |
23 | * * Redistributions of source code must retain the above copyright | |
24 | * notice, this list of conditions and the following disclaimer. | |
25 | * * Redistributions in binary form must reproduce the above copy | |
26 | * notice, this list of conditions and the following disclaimer in | |
27 | * the documentation and/or other materials provided with the | |
28 | * distribution. | |
29 | * * Neither the name of Intel Corporation nor the names of its | |
30 | * contributors may be used to endorse or promote products derived | |
31 | * from this software without specific prior written permission. | |
32 | * | |
33 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
34 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
35 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
36 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
37 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
38 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
39 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
40 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
41 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
42 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
43 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
44 | * | |
e26a5843 | 45 | * PCIe NTB Transport Linux driver |
fce8a7bb JM |
46 | * |
47 | * Contact Information: | |
48 | * Jon Mason <jon.mason@intel.com> | |
49 | */ | |
50 | #include <linux/debugfs.h> | |
51 | #include <linux/delay.h> | |
282a2fee | 52 | #include <linux/dmaengine.h> |
fce8a7bb JM |
53 | #include <linux/dma-mapping.h> |
54 | #include <linux/errno.h> | |
55 | #include <linux/export.h> | |
56 | #include <linux/interrupt.h> | |
57 | #include <linux/module.h> | |
58 | #include <linux/pci.h> | |
59 | #include <linux/slab.h> | |
60 | #include <linux/types.h> | |
e26a5843 AH |
61 | #include "linux/ntb.h" |
62 | #include "linux/ntb_transport.h" | |
fce8a7bb | 63 | |
e26a5843 AH |
64 | #define NTB_TRANSPORT_VERSION 4 |
65 | #define NTB_TRANSPORT_VER "4" | |
66 | #define NTB_TRANSPORT_NAME "ntb_transport" | |
67 | #define NTB_TRANSPORT_DESC "Software Queue-Pair Transport over NTB" | |
68 | ||
69 | MODULE_DESCRIPTION(NTB_TRANSPORT_DESC); | |
70 | MODULE_VERSION(NTB_TRANSPORT_VER); | |
71 | MODULE_LICENSE("Dual BSD/GPL"); | |
72 | MODULE_AUTHOR("Intel Corporation"); | |
73 | ||
74 | static unsigned long max_mw_size; | |
75 | module_param(max_mw_size, ulong, 0644); | |
76 | MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows"); | |
fce8a7bb | 77 | |
ef114ed5 | 78 | static unsigned int transport_mtu = 0x401E; |
fce8a7bb JM |
79 | module_param(transport_mtu, uint, 0644); |
80 | MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets"); | |
81 | ||
948d3a65 | 82 | static unsigned char max_num_clients; |
fce8a7bb JM |
83 | module_param(max_num_clients, byte, 0644); |
84 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
85 | ||
282a2fee JM |
86 | static unsigned int copy_bytes = 1024; |
87 | module_param(copy_bytes, uint, 0644); | |
88 | MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA"); | |
89 | ||
e26a5843 AH |
90 | static struct dentry *nt_debugfs_dir; |
91 | ||
fce8a7bb JM |
92 | struct ntb_queue_entry { |
93 | /* ntb_queue list reference */ | |
94 | struct list_head entry; | |
e26a5843 | 95 | /* pointers to data to be transferred */ |
fce8a7bb JM |
96 | void *cb_data; |
97 | void *buf; | |
98 | unsigned int len; | |
99 | unsigned int flags; | |
282a2fee JM |
100 | |
101 | struct ntb_transport_qp *qp; | |
102 | union { | |
103 | struct ntb_payload_header __iomem *tx_hdr; | |
104 | struct ntb_payload_header *rx_hdr; | |
105 | }; | |
106 | unsigned int index; | |
fce8a7bb JM |
107 | }; |
108 | ||
793c20e9 JM |
109 | struct ntb_rx_info { |
110 | unsigned int entry; | |
111 | }; | |
112 | ||
fce8a7bb | 113 | struct ntb_transport_qp { |
e26a5843 AH |
114 | struct ntb_transport_ctx *transport; |
115 | struct ntb_dev *ndev; | |
fce8a7bb | 116 | void *cb_data; |
282a2fee | 117 | struct dma_chan *dma_chan; |
fce8a7bb JM |
118 | |
119 | bool client_ready; | |
e26a5843 AH |
120 | bool link_is_up; |
121 | ||
fce8a7bb | 122 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 123 | u64 qp_bit; |
fce8a7bb | 124 | |
74465645 | 125 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
126 | struct ntb_rx_info *remote_rx_info; |
127 | ||
53ca4fea JM |
128 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
129 | void *data, int len); | |
fce8a7bb JM |
130 | struct list_head tx_free_q; |
131 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 132 | void __iomem *tx_mw; |
282a2fee | 133 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
134 | unsigned int tx_index; |
135 | unsigned int tx_max_entry; | |
ef114ed5 | 136 | unsigned int tx_max_frame; |
fce8a7bb | 137 | |
53ca4fea JM |
138 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
139 | void *data, int len); | |
fce8a7bb JM |
140 | struct list_head rx_pend_q; |
141 | struct list_head rx_free_q; | |
142 | spinlock_t ntb_rx_pend_q_lock; | |
143 | spinlock_t ntb_rx_free_q_lock; | |
793c20e9 JM |
144 | void *rx_buff; |
145 | unsigned int rx_index; | |
146 | unsigned int rx_max_entry; | |
ef114ed5 | 147 | unsigned int rx_max_frame; |
282a2fee | 148 | dma_cookie_t last_cookie; |
e26a5843 | 149 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 150 | |
53ca4fea | 151 | void (*event_handler)(void *data, int status); |
fce8a7bb | 152 | struct delayed_work link_work; |
7b4f2d3c | 153 | struct work_struct link_cleanup; |
fce8a7bb JM |
154 | |
155 | struct dentry *debugfs_dir; | |
156 | struct dentry *debugfs_stats; | |
157 | ||
158 | /* Stats */ | |
159 | u64 rx_bytes; | |
160 | u64 rx_pkts; | |
161 | u64 rx_ring_empty; | |
162 | u64 rx_err_no_buf; | |
163 | u64 rx_err_oflow; | |
164 | u64 rx_err_ver; | |
282a2fee JM |
165 | u64 rx_memcpy; |
166 | u64 rx_async; | |
fce8a7bb JM |
167 | u64 tx_bytes; |
168 | u64 tx_pkts; | |
169 | u64 tx_ring_full; | |
282a2fee JM |
170 | u64 tx_err_no_buf; |
171 | u64 tx_memcpy; | |
172 | u64 tx_async; | |
fce8a7bb JM |
173 | }; |
174 | ||
175 | struct ntb_transport_mw { | |
e26a5843 AH |
176 | phys_addr_t phys_addr; |
177 | resource_size_t phys_size; | |
178 | resource_size_t xlat_align; | |
179 | resource_size_t xlat_align_size; | |
180 | void __iomem *vbase; | |
181 | size_t xlat_size; | |
182 | size_t buff_size; | |
fce8a7bb JM |
183 | void *virt_addr; |
184 | dma_addr_t dma_addr; | |
185 | }; | |
186 | ||
187 | struct ntb_transport_client_dev { | |
188 | struct list_head entry; | |
e26a5843 | 189 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
190 | struct device dev; |
191 | }; | |
192 | ||
e26a5843 | 193 | struct ntb_transport_ctx { |
fce8a7bb JM |
194 | struct list_head entry; |
195 | struct list_head client_devs; | |
196 | ||
e26a5843 AH |
197 | struct ntb_dev *ndev; |
198 | ||
199 | struct ntb_transport_mw *mw_vec; | |
200 | struct ntb_transport_qp *qp_vec; | |
201 | unsigned int mw_count; | |
202 | unsigned int qp_count; | |
203 | u64 qp_bitmap; | |
204 | u64 qp_bitmap_free; | |
205 | ||
206 | bool link_is_up; | |
fce8a7bb | 207 | struct delayed_work link_work; |
7b4f2d3c | 208 | struct work_struct link_cleanup; |
fce8a7bb JM |
209 | }; |
210 | ||
211 | enum { | |
e26a5843 AH |
212 | DESC_DONE_FLAG = BIT(0), |
213 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
214 | }; |
215 | ||
216 | struct ntb_payload_header { | |
74465645 | 217 | unsigned int ver; |
fce8a7bb JM |
218 | unsigned int len; |
219 | unsigned int flags; | |
220 | }; | |
221 | ||
222 | enum { | |
223 | VERSION = 0, | |
fce8a7bb | 224 | QP_LINKS, |
113fc505 JM |
225 | NUM_QPS, |
226 | NUM_MWS, | |
227 | MW0_SZ_HIGH, | |
228 | MW0_SZ_LOW, | |
229 | MW1_SZ_HIGH, | |
230 | MW1_SZ_LOW, | |
fce8a7bb JM |
231 | MAX_SPAD, |
232 | }; | |
233 | ||
e26a5843 AH |
234 | #define dev_client_dev(__dev) \ |
235 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
236 | ||
237 | #define drv_client(__drv) \ | |
238 | container_of((__drv), struct ntb_transport_client, driver) | |
239 | ||
240 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
241 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
242 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
243 | ||
e26a5843 AH |
244 | static void ntb_transport_rxc_db(unsigned long data); |
245 | static const struct ntb_ctx_ops ntb_transport_ops; | |
246 | static struct ntb_client ntb_transport_client; | |
247 | ||
248 | static int ntb_transport_bus_match(struct device *dev, | |
249 | struct device_driver *drv) | |
fce8a7bb JM |
250 | { |
251 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
252 | } | |
253 | ||
e26a5843 | 254 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 255 | { |
e26a5843 | 256 | const struct ntb_transport_client *client; |
fce8a7bb JM |
257 | int rc = -EINVAL; |
258 | ||
259 | get_device(dev); | |
e26a5843 AH |
260 | |
261 | client = drv_client(dev->driver); | |
262 | rc = client->probe(dev); | |
fce8a7bb JM |
263 | if (rc) |
264 | put_device(dev); | |
265 | ||
266 | return rc; | |
267 | } | |
268 | ||
e26a5843 | 269 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 270 | { |
e26a5843 | 271 | const struct ntb_transport_client *client; |
fce8a7bb | 272 | |
e26a5843 AH |
273 | client = drv_client(dev->driver); |
274 | client->remove(dev); | |
fce8a7bb JM |
275 | |
276 | put_device(dev); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
e26a5843 AH |
281 | static struct bus_type ntb_transport_bus = { |
282 | .name = "ntb_transport", | |
283 | .match = ntb_transport_bus_match, | |
284 | .probe = ntb_transport_bus_probe, | |
285 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
286 | }; |
287 | ||
288 | static LIST_HEAD(ntb_transport_list); | |
289 | ||
e26a5843 | 290 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 291 | { |
fce8a7bb | 292 | list_add(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
293 | return 0; |
294 | } | |
295 | ||
e26a5843 | 296 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
297 | { |
298 | struct ntb_transport_client_dev *client_dev, *cd; | |
299 | ||
300 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
301 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
302 | dev_name(&client_dev->dev)); | |
303 | list_del(&client_dev->entry); | |
304 | device_unregister(&client_dev->dev); | |
305 | } | |
306 | ||
307 | list_del(&nt->entry); | |
fce8a7bb JM |
308 | } |
309 | ||
e26a5843 | 310 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
311 | { |
312 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 313 | |
e26a5843 | 314 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
315 | kfree(client_dev); |
316 | } | |
317 | ||
318 | /** | |
e26a5843 | 319 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
320 | * @device_name: Name of NTB client device |
321 | * | |
322 | * Unregister an NTB client device with the NTB transport layer | |
323 | */ | |
e26a5843 | 324 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
325 | { |
326 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 327 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
328 | |
329 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
330 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
331 | if (!strncmp(dev_name(&client->dev), device_name, | |
332 | strlen(device_name))) { | |
333 | list_del(&client->entry); | |
334 | device_unregister(&client->dev); | |
335 | } | |
336 | } | |
e26a5843 | 337 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
338 | |
339 | /** | |
e26a5843 | 340 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
341 | * @device_name: Name of NTB client device |
342 | * | |
343 | * Register an NTB client device with the NTB transport layer | |
344 | */ | |
e26a5843 | 345 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
346 | { |
347 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 348 | struct ntb_transport_ctx *nt; |
8b19d450 | 349 | int rc, i = 0; |
fce8a7bb | 350 | |
8222b402 JM |
351 | if (list_empty(&ntb_transport_list)) |
352 | return -ENODEV; | |
353 | ||
fce8a7bb JM |
354 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
355 | struct device *dev; | |
356 | ||
e26a5843 | 357 | client_dev = kzalloc(sizeof(*client_dev), |
fce8a7bb JM |
358 | GFP_KERNEL); |
359 | if (!client_dev) { | |
360 | rc = -ENOMEM; | |
361 | goto err; | |
362 | } | |
363 | ||
364 | dev = &client_dev->dev; | |
365 | ||
366 | /* setup and register client devices */ | |
8b19d450 | 367 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
368 | dev->bus = &ntb_transport_bus; |
369 | dev->release = ntb_transport_client_release; | |
370 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
371 | |
372 | rc = device_register(dev); | |
373 | if (rc) { | |
374 | kfree(client_dev); | |
375 | goto err; | |
376 | } | |
377 | ||
378 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 379 | i++; |
fce8a7bb JM |
380 | } |
381 | ||
382 | return 0; | |
383 | ||
384 | err: | |
e26a5843 | 385 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
386 | |
387 | return rc; | |
388 | } | |
e26a5843 | 389 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
390 | |
391 | /** | |
ec110bc7 | 392 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
393 | * @drv: NTB client driver to be registered |
394 | * | |
395 | * Register an NTB client driver with the NTB transport layer | |
396 | * | |
397 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
398 | */ | |
e26a5843 | 399 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 400 | { |
e26a5843 | 401 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 402 | |
8222b402 JM |
403 | if (list_empty(&ntb_transport_list)) |
404 | return -ENODEV; | |
405 | ||
fce8a7bb JM |
406 | return driver_register(&drv->driver); |
407 | } | |
ec110bc7 | 408 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
409 | |
410 | /** | |
ec110bc7 | 411 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
412 | * @drv: NTB client driver to be unregistered |
413 | * | |
414 | * Unregister an NTB client driver with the NTB transport layer | |
415 | * | |
416 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
417 | */ | |
e26a5843 | 418 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
419 | { |
420 | driver_unregister(&drv->driver); | |
421 | } | |
ec110bc7 | 422 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 423 | |
fce8a7bb JM |
424 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
425 | loff_t *offp) | |
426 | { | |
427 | struct ntb_transport_qp *qp; | |
d7237e22 | 428 | char *buf; |
fce8a7bb JM |
429 | ssize_t ret, out_offset, out_count; |
430 | ||
282a2fee | 431 | out_count = 1000; |
d7237e22 JM |
432 | |
433 | buf = kmalloc(out_count, GFP_KERNEL); | |
434 | if (!buf) | |
435 | return -ENOMEM; | |
fce8a7bb JM |
436 | |
437 | qp = filp->private_data; | |
438 | out_offset = 0; | |
439 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
440 | "NTB QP stats\n"); | |
441 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
442 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
443 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
444 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
445 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
446 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
447 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
448 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
449 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
450 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
451 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
452 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
453 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
454 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
455 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
456 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
457 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 458 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 459 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 460 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 461 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 462 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
463 | |
464 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
465 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
466 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
467 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
468 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
469 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
470 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
471 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
472 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
473 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
474 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
475 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 476 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 477 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 478 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 479 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 480 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 481 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
482 | |
483 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
e26a5843 AH |
484 | "\nQP Link %s\n", |
485 | qp->link_is_up ? "Up" : "Down"); | |
d7237e22 JM |
486 | if (out_offset > out_count) |
487 | out_offset = out_count; | |
fce8a7bb JM |
488 | |
489 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 490 | kfree(buf); |
fce8a7bb JM |
491 | return ret; |
492 | } | |
493 | ||
494 | static const struct file_operations ntb_qp_debugfs_stats = { | |
495 | .owner = THIS_MODULE, | |
d66d7ac2 | 496 | .open = simple_open, |
fce8a7bb JM |
497 | .read = debugfs_read, |
498 | }; | |
499 | ||
500 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
501 | struct list_head *list) | |
502 | { | |
503 | unsigned long flags; | |
504 | ||
505 | spin_lock_irqsave(lock, flags); | |
506 | list_add_tail(entry, list); | |
507 | spin_unlock_irqrestore(lock, flags); | |
508 | } | |
509 | ||
510 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 511 | struct list_head *list) |
fce8a7bb JM |
512 | { |
513 | struct ntb_queue_entry *entry; | |
514 | unsigned long flags; | |
515 | ||
516 | spin_lock_irqsave(lock, flags); | |
517 | if (list_empty(list)) { | |
518 | entry = NULL; | |
519 | goto out; | |
520 | } | |
521 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
522 | list_del(&entry->entry); | |
523 | out: | |
524 | spin_unlock_irqrestore(lock, flags); | |
525 | ||
526 | return entry; | |
527 | } | |
528 | ||
e26a5843 AH |
529 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
530 | unsigned int qp_num) | |
fce8a7bb | 531 | { |
e26a5843 AH |
532 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
533 | struct ntb_transport_mw *mw; | |
ef114ed5 | 534 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 535 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 536 | unsigned int i; |
fce8a7bb | 537 | |
e26a5843 AH |
538 | mw_count = nt->mw_count; |
539 | qp_count = nt->qp_count; | |
948d3a65 | 540 | |
e26a5843 AH |
541 | mw_num = QP_TO_MW(nt, qp_num); |
542 | mw = &nt->mw_vec[mw_num]; | |
543 | ||
544 | if (!mw->virt_addr) | |
545 | return -ENOMEM; | |
fce8a7bb | 546 | |
e26a5843 AH |
547 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
548 | num_qps_mw = qp_count / mw_count + 1; | |
fce8a7bb | 549 | else |
e26a5843 | 550 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 551 | |
e26a5843 AH |
552 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
553 | qp->rx_buff = mw->virt_addr + rx_size * qp_num / mw_count; | |
793c20e9 JM |
554 | rx_size -= sizeof(struct ntb_rx_info); |
555 | ||
282a2fee JM |
556 | qp->remote_rx_info = qp->rx_buff + rx_size; |
557 | ||
c9d534c8 JM |
558 | /* Due to housekeeping, there must be atleast 2 buffs */ |
559 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
560 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
561 | qp->rx_index = 0; | |
562 | ||
c9d534c8 | 563 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 564 | |
ef114ed5 | 565 | /* setup the hdr offsets with 0's */ |
793c20e9 | 566 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
567 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
568 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 569 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 570 | } |
fce8a7bb JM |
571 | |
572 | qp->rx_pkts = 0; | |
573 | qp->tx_pkts = 0; | |
90f9e934 | 574 | qp->tx_index = 0; |
e26a5843 AH |
575 | |
576 | return 0; | |
fce8a7bb JM |
577 | } |
578 | ||
e26a5843 | 579 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 580 | { |
e26a5843 AH |
581 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
582 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
583 | |
584 | if (!mw->virt_addr) | |
585 | return; | |
586 | ||
e26a5843 AH |
587 | ntb_mw_clear_trans(nt->ndev, num_mw); |
588 | dma_free_coherent(&pdev->dev, mw->buff_size, | |
589 | mw->virt_addr, mw->dma_addr); | |
590 | mw->xlat_size = 0; | |
591 | mw->buff_size = 0; | |
b77b2637 JM |
592 | mw->virt_addr = NULL; |
593 | } | |
594 | ||
e26a5843 AH |
595 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
596 | unsigned int size) | |
fce8a7bb | 597 | { |
e26a5843 AH |
598 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
599 | struct pci_dev *pdev = nt->ndev->pdev; | |
600 | unsigned int xlat_size, buff_size; | |
601 | int rc; | |
602 | ||
603 | xlat_size = round_up(size, mw->xlat_align_size); | |
604 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 605 | |
b77b2637 | 606 | /* No need to re-setup */ |
e26a5843 | 607 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
608 | return 0; |
609 | ||
e26a5843 | 610 | if (mw->buff_size) |
b77b2637 JM |
611 | ntb_free_mw(nt, num_mw); |
612 | ||
e26a5843 AH |
613 | /* Alloc memory for receiving data. Must be aligned */ |
614 | mw->xlat_size = xlat_size; | |
615 | mw->buff_size = buff_size; | |
fce8a7bb | 616 | |
e26a5843 AH |
617 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
618 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 619 | if (!mw->virt_addr) { |
e26a5843 AH |
620 | mw->xlat_size = 0; |
621 | mw->buff_size = 0; | |
622 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %d\n", | |
623 | buff_size); | |
fce8a7bb JM |
624 | return -ENOMEM; |
625 | } | |
626 | ||
3cc5ba19 DJ |
627 | /* |
628 | * we must ensure that the memory address allocated is BAR size | |
629 | * aligned in order for the XLAT register to take the value. This | |
630 | * is a requirement of the hardware. It is recommended to setup CMA | |
631 | * for BAR sizes equal or greater than 4MB. | |
632 | */ | |
e26a5843 AH |
633 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
634 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
635 | &mw->dma_addr); |
636 | ntb_free_mw(nt, num_mw); | |
637 | return -ENOMEM; | |
638 | } | |
639 | ||
fce8a7bb | 640 | /* Notify HW the memory location of the receive buffer */ |
e26a5843 AH |
641 | rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
642 | if (rc) { | |
643 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
644 | ntb_free_mw(nt, num_mw); | |
645 | return -EIO; | |
646 | } | |
fce8a7bb JM |
647 | |
648 | return 0; | |
649 | } | |
650 | ||
2849b5d7 AH |
651 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
652 | { | |
653 | qp->link_is_up = false; | |
654 | ||
655 | qp->tx_index = 0; | |
656 | qp->rx_index = 0; | |
657 | qp->rx_bytes = 0; | |
658 | qp->rx_pkts = 0; | |
659 | qp->rx_ring_empty = 0; | |
660 | qp->rx_err_no_buf = 0; | |
661 | qp->rx_err_oflow = 0; | |
662 | qp->rx_err_ver = 0; | |
663 | qp->rx_memcpy = 0; | |
664 | qp->rx_async = 0; | |
665 | qp->tx_bytes = 0; | |
666 | qp->tx_pkts = 0; | |
667 | qp->tx_ring_full = 0; | |
668 | qp->tx_err_no_buf = 0; | |
669 | qp->tx_memcpy = 0; | |
670 | qp->tx_async = 0; | |
671 | } | |
672 | ||
fca4d518 | 673 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 674 | { |
e26a5843 AH |
675 | struct ntb_transport_ctx *nt = qp->transport; |
676 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 677 | |
e22e0b9d | 678 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
679 | |
680 | cancel_delayed_work_sync(&qp->link_work); | |
681 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
682 | |
683 | if (qp->event_handler) | |
684 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
685 | } |
686 | ||
687 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
688 | { | |
689 | struct ntb_transport_qp *qp = container_of(work, | |
690 | struct ntb_transport_qp, | |
691 | link_cleanup); | |
e26a5843 | 692 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
693 | |
694 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 695 | |
e26a5843 | 696 | if (nt->link_is_up) |
fce8a7bb JM |
697 | schedule_delayed_work(&qp->link_work, |
698 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
699 | } | |
700 | ||
7b4f2d3c JM |
701 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
702 | { | |
703 | schedule_work(&qp->link_cleanup); | |
704 | } | |
705 | ||
e26a5843 | 706 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 707 | { |
e26a5843 AH |
708 | struct ntb_transport_qp *qp; |
709 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
710 | int i; |
711 | ||
e26a5843 AH |
712 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
713 | ||
fca4d518 | 714 | /* Pass along the info to any clients */ |
e26a5843 AH |
715 | for (i = 0; i < nt->qp_count; i++) |
716 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
717 | qp = &nt->qp_vec[i]; | |
718 | ntb_qp_link_cleanup(qp); | |
719 | cancel_work_sync(&qp->link_cleanup); | |
720 | cancel_delayed_work_sync(&qp->link_work); | |
721 | } | |
fca4d518 | 722 | |
e26a5843 | 723 | if (!nt->link_is_up) |
fce8a7bb | 724 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 725 | |
fce8a7bb JM |
726 | /* The scratchpad registers keep the values if the remote side |
727 | * goes down, blast them now to give them a sane value the next | |
728 | * time they are accessed | |
729 | */ | |
730 | for (i = 0; i < MAX_SPAD; i++) | |
e26a5843 | 731 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
732 | } |
733 | ||
fca4d518 JM |
734 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
735 | { | |
e26a5843 AH |
736 | struct ntb_transport_ctx *nt = |
737 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
738 | |
739 | ntb_transport_link_cleanup(nt); | |
740 | } | |
741 | ||
e26a5843 | 742 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 743 | { |
e26a5843 | 744 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 745 | |
e26a5843 | 746 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 747 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 748 | else |
7b4f2d3c | 749 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
750 | } |
751 | ||
752 | static void ntb_transport_link_work(struct work_struct *work) | |
753 | { | |
e26a5843 AH |
754 | struct ntb_transport_ctx *nt = |
755 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
756 | struct ntb_dev *ndev = nt->ndev; | |
757 | struct pci_dev *pdev = ndev->pdev; | |
758 | resource_size_t size; | |
fce8a7bb | 759 | u32 val; |
e26a5843 | 760 | int rc, i, spad; |
fce8a7bb | 761 | |
113fc505 | 762 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
763 | for (i = 0; i < nt->mw_count; i++) { |
764 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 765 | |
e26a5843 AH |
766 | if (max_mw_size && size > max_mw_size) |
767 | size = max_mw_size; | |
fce8a7bb | 768 | |
e26a5843 AH |
769 | spad = MW0_SZ_HIGH + (i * 2); |
770 | ntb_peer_spad_write(ndev, spad, (u32)(size >> 32)); | |
fce8a7bb | 771 | |
e26a5843 AH |
772 | spad = MW0_SZ_LOW + (i * 2); |
773 | ntb_peer_spad_write(ndev, spad, (u32)size); | |
fce8a7bb JM |
774 | } |
775 | ||
e26a5843 | 776 | ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
fce8a7bb | 777 | |
e26a5843 | 778 | ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
fce8a7bb | 779 | |
e26a5843 | 780 | ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 781 | |
e26a5843 | 782 | /* Query the remote side for its info */ |
0f69a7df | 783 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
784 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
785 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 786 | goto out; |
fce8a7bb | 787 | |
0f69a7df | 788 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 789 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 790 | if (val != nt->qp_count) |
fce8a7bb | 791 | goto out; |
fce8a7bb | 792 | |
0f69a7df | 793 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 794 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
795 | if (val != nt->mw_count) |
796 | goto out; | |
fce8a7bb | 797 | |
e26a5843 | 798 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 799 | u64 val64; |
fce8a7bb | 800 | |
0f69a7df | 801 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 802 | val64 = (u64)val << 32; |
113fc505 | 803 | |
0f69a7df | 804 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
805 | val64 |= val; |
806 | ||
e26a5843 | 807 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
808 | |
809 | rc = ntb_set_mw(nt, i, val64); | |
810 | if (rc) | |
811 | goto out1; | |
812 | } | |
fce8a7bb | 813 | |
e26a5843 | 814 | nt->link_is_up = true; |
fce8a7bb | 815 | |
e26a5843 AH |
816 | for (i = 0; i < nt->qp_count; i++) { |
817 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
818 | |
819 | ntb_transport_setup_qp_mw(nt, i); | |
820 | ||
e26a5843 | 821 | if (qp->client_ready) |
fce8a7bb JM |
822 | schedule_delayed_work(&qp->link_work, 0); |
823 | } | |
824 | ||
825 | return; | |
826 | ||
113fc505 | 827 | out1: |
e26a5843 | 828 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 829 | ntb_free_mw(nt, i); |
fce8a7bb | 830 | out: |
e26a5843 | 831 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
832 | schedule_delayed_work(&nt->link_work, |
833 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
834 | } | |
835 | ||
836 | static void ntb_qp_link_work(struct work_struct *work) | |
837 | { | |
838 | struct ntb_transport_qp *qp = container_of(work, | |
839 | struct ntb_transport_qp, | |
840 | link_work.work); | |
e26a5843 AH |
841 | struct pci_dev *pdev = qp->ndev->pdev; |
842 | struct ntb_transport_ctx *nt = qp->transport; | |
843 | int val; | |
fce8a7bb | 844 | |
e26a5843 | 845 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 846 | |
e26a5843 | 847 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 848 | |
e26a5843 | 849 | ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
850 | |
851 | /* query remote spad for qp ready bits */ | |
e26a5843 | 852 | ntb_peer_spad_read(nt->ndev, QP_LINKS); |
28762289 | 853 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
854 | |
855 | /* See if the remote side is up */ | |
e26a5843 | 856 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 857 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 AH |
858 | qp->link_is_up = true; |
859 | ||
fce8a7bb | 860 | if (qp->event_handler) |
e26a5843 AH |
861 | qp->event_handler(qp->cb_data, qp->link_is_up); |
862 | } else if (nt->link_is_up) | |
fce8a7bb JM |
863 | schedule_delayed_work(&qp->link_work, |
864 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
865 | } | |
866 | ||
e26a5843 | 867 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 868 | unsigned int qp_num) |
fce8a7bb JM |
869 | { |
870 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
871 | struct ntb_transport_mw *mw; |
872 | phys_addr_t mw_base; | |
873 | resource_size_t mw_size; | |
ef114ed5 | 874 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 875 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 876 | u64 qp_offset; |
948d3a65 | 877 | |
e26a5843 AH |
878 | mw_count = nt->mw_count; |
879 | qp_count = nt->qp_count; | |
fce8a7bb | 880 | |
e26a5843 AH |
881 | mw_num = QP_TO_MW(nt, qp_num); |
882 | mw = &nt->mw_vec[mw_num]; | |
883 | ||
884 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
885 | qp->qp_num = qp_num; |
886 | qp->transport = nt; | |
887 | qp->ndev = nt->ndev; | |
e26a5843 | 888 | qp->client_ready = false; |
fce8a7bb | 889 | qp->event_handler = NULL; |
2849b5d7 | 890 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 891 | |
e26a5843 AH |
892 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
893 | num_qps_mw = qp_count / mw_count + 1; | |
ef114ed5 | 894 | else |
e26a5843 AH |
895 | num_qps_mw = qp_count / mw_count; |
896 | ||
897 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
898 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 899 | |
e26a5843 AH |
900 | tx_size = (unsigned int)mw_size / num_qps_mw; |
901 | qp_offset = tx_size * qp_num / mw_count; | |
902 | ||
903 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
904 | if (!qp->tx_mw) |
905 | return -EINVAL; | |
906 | ||
e26a5843 | 907 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
908 | if (!qp->tx_mw_phys) |
909 | return -EINVAL; | |
910 | ||
793c20e9 | 911 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 912 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 913 | |
c9d534c8 JM |
914 | /* Due to housekeeping, there must be atleast 2 buffs */ |
915 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 916 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 917 | |
e26a5843 | 918 | if (nt_debugfs_dir) { |
fce8a7bb JM |
919 | char debugfs_name[4]; |
920 | ||
921 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
922 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
e26a5843 | 923 | nt_debugfs_dir); |
fce8a7bb JM |
924 | |
925 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
926 | qp->debugfs_dir, qp, | |
927 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
928 | } else { |
929 | qp->debugfs_dir = NULL; | |
930 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
931 | } |
932 | ||
933 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 934 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb JM |
935 | |
936 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
937 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
938 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
939 | ||
940 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
941 | INIT_LIST_HEAD(&qp->rx_free_q); | |
942 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 943 | |
e26a5843 AH |
944 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
945 | (unsigned long)qp); | |
946 | ||
282a2fee | 947 | return 0; |
fce8a7bb JM |
948 | } |
949 | ||
e26a5843 | 950 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 951 | { |
e26a5843 AH |
952 | struct ntb_transport_ctx *nt; |
953 | struct ntb_transport_mw *mw; | |
954 | unsigned int mw_count, qp_count; | |
955 | u64 qp_bitmap; | |
fce8a7bb JM |
956 | int rc, i; |
957 | ||
e26a5843 AH |
958 | if (ntb_db_is_unsafe(ndev)) |
959 | dev_dbg(&ndev->dev, | |
960 | "doorbell is unsafe, proceed anyway...\n"); | |
961 | if (ntb_spad_is_unsafe(ndev)) | |
962 | dev_dbg(&ndev->dev, | |
963 | "scratchpad is unsafe, proceed anyway...\n"); | |
964 | ||
965 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); | |
fce8a7bb JM |
966 | if (!nt) |
967 | return -ENOMEM; | |
968 | ||
e26a5843 AH |
969 | nt->ndev = ndev; |
970 | ||
971 | mw_count = ntb_mw_count(ndev); | |
972 | ||
973 | nt->mw_count = mw_count; | |
974 | ||
975 | nt->mw_vec = kcalloc(mw_count, sizeof(*nt->mw_vec), GFP_KERNEL); | |
976 | if (!nt->mw_vec) { | |
977 | rc = -ENOMEM; | |
fce8a7bb JM |
978 | goto err; |
979 | } | |
980 | ||
e26a5843 AH |
981 | for (i = 0; i < mw_count; i++) { |
982 | mw = &nt->mw_vec[i]; | |
983 | ||
984 | rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, | |
985 | &mw->xlat_align, &mw->xlat_align_size); | |
986 | if (rc) | |
987 | goto err1; | |
988 | ||
989 | mw->vbase = ioremap(mw->phys_addr, mw->phys_size); | |
990 | if (!mw->vbase) { | |
991 | rc = -ENOMEM; | |
992 | goto err1; | |
993 | } | |
994 | ||
995 | mw->buff_size = 0; | |
996 | mw->xlat_size = 0; | |
997 | mw->virt_addr = NULL; | |
998 | mw->dma_addr = 0; | |
948d3a65 JM |
999 | } |
1000 | ||
e26a5843 AH |
1001 | qp_bitmap = ntb_db_valid_mask(ndev); |
1002 | ||
1003 | qp_count = ilog2(qp_bitmap); | |
1004 | if (max_num_clients && max_num_clients < qp_count) | |
1005 | qp_count = max_num_clients; | |
1006 | else if (mw_count < qp_count) | |
1007 | qp_count = mw_count; | |
1008 | ||
1009 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1010 | ||
1011 | nt->qp_count = qp_count; | |
1012 | nt->qp_bitmap = qp_bitmap; | |
1013 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1014 | |
e26a5843 AH |
1015 | nt->qp_vec = kcalloc(qp_count, sizeof(*nt->qp_vec), GFP_KERNEL); |
1016 | if (!nt->qp_vec) { | |
fce8a7bb | 1017 | rc = -ENOMEM; |
948d3a65 | 1018 | goto err2; |
fce8a7bb JM |
1019 | } |
1020 | ||
e26a5843 | 1021 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1022 | rc = ntb_transport_init_queue(nt, i); |
1023 | if (rc) | |
1024 | goto err3; | |
1025 | } | |
fce8a7bb JM |
1026 | |
1027 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1028 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1029 | |
e26a5843 | 1030 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1031 | if (rc) |
948d3a65 | 1032 | goto err3; |
fce8a7bb JM |
1033 | |
1034 | INIT_LIST_HEAD(&nt->client_devs); | |
1035 | rc = ntb_bus_init(nt); | |
1036 | if (rc) | |
948d3a65 | 1037 | goto err4; |
fce8a7bb | 1038 | |
e26a5843 AH |
1039 | nt->link_is_up = false; |
1040 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1041 | ntb_link_event(ndev); | |
fce8a7bb JM |
1042 | |
1043 | return 0; | |
1044 | ||
948d3a65 | 1045 | err4: |
e26a5843 | 1046 | ntb_clear_ctx(ndev); |
948d3a65 | 1047 | err3: |
e26a5843 | 1048 | kfree(nt->qp_vec); |
948d3a65 | 1049 | err2: |
e26a5843 | 1050 | kfree(nt->mw_vec); |
fce8a7bb | 1051 | err1: |
e26a5843 AH |
1052 | while (i--) { |
1053 | mw = &nt->mw_vec[i]; | |
1054 | iounmap(mw->vbase); | |
1055 | } | |
fce8a7bb | 1056 | err: |
fce8a7bb JM |
1057 | kfree(nt); |
1058 | return rc; | |
1059 | } | |
1060 | ||
e26a5843 | 1061 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1062 | { |
e26a5843 AH |
1063 | struct ntb_transport_ctx *nt = ndev->ctx; |
1064 | struct ntb_transport_qp *qp; | |
1065 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1066 | int i; |
1067 | ||
fca4d518 | 1068 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1069 | cancel_work_sync(&nt->link_cleanup); |
1070 | cancel_delayed_work_sync(&nt->link_work); | |
1071 | ||
1072 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1073 | |
1074 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1075 | for (i = 0; i < nt->qp_count; i++) { |
1076 | qp = &nt->qp_vec[i]; | |
1077 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1078 | ntb_transport_free_queue(qp); | |
1079 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1080 | } |
fce8a7bb | 1081 | |
e26a5843 AH |
1082 | ntb_link_disable(ndev); |
1083 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1084 | |
e26a5843 | 1085 | ntb_bus_remove(nt); |
fce8a7bb | 1086 | |
e26a5843 | 1087 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1088 | ntb_free_mw(nt, i); |
e26a5843 AH |
1089 | iounmap(nt->mw_vec[i].vbase); |
1090 | } | |
fce8a7bb | 1091 | |
e26a5843 AH |
1092 | kfree(nt->qp_vec); |
1093 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1094 | kfree(nt); |
1095 | } | |
1096 | ||
282a2fee | 1097 | static void ntb_rx_copy_callback(void *data) |
fce8a7bb | 1098 | { |
282a2fee JM |
1099 | struct ntb_queue_entry *entry = data; |
1100 | struct ntb_transport_qp *qp = entry->qp; | |
448c6fb3 JM |
1101 | void *cb_data = entry->cb_data; |
1102 | unsigned int len = entry->len; | |
282a2fee JM |
1103 | struct ntb_payload_header *hdr = entry->rx_hdr; |
1104 | ||
282a2fee | 1105 | hdr->flags = 0; |
fce8a7bb | 1106 | |
282a2fee | 1107 | iowrite32(entry->index, &qp->rx_info->entry); |
fce8a7bb JM |
1108 | |
1109 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 | 1110 | |
e26a5843 | 1111 | if (qp->rx_handler && qp->client_ready) |
448c6fb3 | 1112 | qp->rx_handler(qp, qp->cb_data, cb_data, len); |
fce8a7bb JM |
1113 | } |
1114 | ||
282a2fee JM |
1115 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1116 | { | |
1117 | void *buf = entry->buf; | |
1118 | size_t len = entry->len; | |
1119 | ||
1120 | memcpy(buf, offset, len); | |
1121 | ||
e26a5843 AH |
1122 | /* Ensure that the data is fully copied out before clearing the flag */ |
1123 | wmb(); | |
1124 | ||
282a2fee JM |
1125 | ntb_rx_copy_callback(entry); |
1126 | } | |
1127 | ||
1128 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset, | |
1129 | size_t len) | |
1130 | { | |
1131 | struct dma_async_tx_descriptor *txd; | |
1132 | struct ntb_transport_qp *qp = entry->qp; | |
1133 | struct dma_chan *chan = qp->dma_chan; | |
1134 | struct dma_device *device; | |
1135 | size_t pay_off, buff_off; | |
6f57fd05 | 1136 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1137 | dma_cookie_t cookie; |
1138 | void *buf = entry->buf; | |
282a2fee JM |
1139 | |
1140 | entry->len = len; | |
1141 | ||
1142 | if (!chan) | |
1143 | goto err; | |
1144 | ||
53ca4fea | 1145 | if (len < copy_bytes) |
6f57fd05 | 1146 | goto err_wait; |
282a2fee JM |
1147 | |
1148 | device = chan->device; | |
e26a5843 AH |
1149 | pay_off = (size_t)offset & ~PAGE_MASK; |
1150 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1151 | |
1152 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
6f57fd05 | 1153 | goto err_wait; |
282a2fee | 1154 | |
6f57fd05 BZ |
1155 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1156 | if (!unmap) | |
1157 | goto err_wait; | |
282a2fee | 1158 | |
6f57fd05 BZ |
1159 | unmap->len = len; |
1160 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1161 | pay_off, len, DMA_TO_DEVICE); | |
1162 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1163 | goto err_get_unmap; | |
1164 | ||
1165 | unmap->to_cnt = 1; | |
282a2fee | 1166 | |
6f57fd05 BZ |
1167 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1168 | buff_off, len, DMA_FROM_DEVICE); | |
1169 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1170 | goto err_get_unmap; | |
1171 | ||
1172 | unmap->from_cnt = 1; | |
1173 | ||
6f57fd05 | 1174 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
0776ae7b BZ |
1175 | unmap->addr[0], len, |
1176 | DMA_PREP_INTERRUPT); | |
282a2fee | 1177 | if (!txd) |
6f57fd05 | 1178 | goto err_get_unmap; |
282a2fee JM |
1179 | |
1180 | txd->callback = ntb_rx_copy_callback; | |
1181 | txd->callback_param = entry; | |
6f57fd05 | 1182 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1183 | |
1184 | cookie = dmaengine_submit(txd); | |
1185 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1186 | goto err_set_unmap; |
1187 | ||
1188 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1189 | |
1190 | qp->last_cookie = cookie; | |
1191 | ||
1192 | qp->rx_async++; | |
1193 | ||
1194 | return; | |
1195 | ||
6f57fd05 BZ |
1196 | err_set_unmap: |
1197 | dmaengine_unmap_put(unmap); | |
1198 | err_get_unmap: | |
1199 | dmaengine_unmap_put(unmap); | |
1200 | err_wait: | |
282a2fee JM |
1201 | /* If the callbacks come out of order, the writing of the index to the |
1202 | * last completed will be out of order. This may result in the | |
1203 | * receive stalling forever. | |
1204 | */ | |
1205 | dma_sync_wait(chan, qp->last_cookie); | |
1206 | err: | |
1207 | ntb_memcpy_rx(entry, offset); | |
1208 | qp->rx_memcpy++; | |
1209 | } | |
1210 | ||
fce8a7bb JM |
1211 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1212 | { | |
1213 | struct ntb_payload_header *hdr; | |
1214 | struct ntb_queue_entry *entry; | |
1215 | void *offset; | |
e26a5843 | 1216 | int rc; |
fce8a7bb | 1217 | |
793c20e9 JM |
1218 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1219 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1220 | ||
e26a5843 AH |
1221 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1222 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1223 | |
fce8a7bb | 1224 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1225 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1226 | qp->rx_ring_empty++; |
1227 | return -EAGAIN; | |
1228 | } | |
1229 | ||
e26a5843 AH |
1230 | if (hdr->flags & LINK_DOWN_FLAG) { |
1231 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1232 | ntb_qp_link_down(qp); | |
1233 | hdr->flags = 0; | |
c0900b33 | 1234 | return -EAGAIN; |
e26a5843 AH |
1235 | } |
1236 | ||
1237 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1238 | dev_dbg(&qp->ndev->pdev->dev, | |
1239 | "version mismatch, expected %llu - got %u\n", | |
1240 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1241 | qp->rx_err_ver++; |
1242 | return -EIO; | |
1243 | } | |
1244 | ||
e26a5843 AH |
1245 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
1246 | if (!entry) { | |
1247 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1248 | qp->rx_err_no_buf++; | |
fce8a7bb | 1249 | |
e26a5843 | 1250 | rc = -ENOMEM; |
282a2fee | 1251 | goto err; |
fce8a7bb JM |
1252 | } |
1253 | ||
282a2fee | 1254 | if (hdr->len > entry->len) { |
e26a5843 AH |
1255 | dev_dbg(&qp->ndev->pdev->dev, |
1256 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1257 | hdr->len, entry->len); |
e26a5843 | 1258 | qp->rx_err_oflow++; |
282a2fee | 1259 | |
e26a5843 | 1260 | rc = -EIO; |
282a2fee | 1261 | goto err; |
fce8a7bb JM |
1262 | } |
1263 | ||
e26a5843 AH |
1264 | dev_dbg(&qp->ndev->pdev->dev, |
1265 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1266 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
1267 | ||
1268 | qp->rx_bytes += hdr->len; | |
1269 | qp->rx_pkts++; | |
1270 | ||
282a2fee JM |
1271 | entry->index = qp->rx_index; |
1272 | entry->rx_hdr = hdr; | |
1273 | ||
1274 | ntb_async_rx(entry, offset, hdr->len); | |
fce8a7bb | 1275 | |
282a2fee JM |
1276 | qp->rx_index++; |
1277 | qp->rx_index %= qp->rx_max_entry; | |
1278 | ||
1279 | return 0; | |
1280 | ||
1281 | err: | |
e26a5843 AH |
1282 | /* FIXME: if this syncrhonous update of the rx_index gets ahead of |
1283 | * asyncrhonous ntb_rx_copy_callback of previous entry, there are three | |
1284 | * scenarios: | |
1285 | * | |
1286 | * 1) The peer might miss this update, but observe the update | |
1287 | * from the memcpy completion callback. In this case, the buffer will | |
1288 | * not be freed on the peer to be reused for a different packet. The | |
1289 | * successful rx of a later packet would clear the condition, but the | |
1290 | * condition could persist if several rx fail in a row. | |
1291 | * | |
1292 | * 2) The peer may observe this update before the asyncrhonous copy of | |
1293 | * prior packets is completed. The peer may overwrite the buffers of | |
1294 | * the prior packets before they are copied. | |
1295 | * | |
1296 | * 3) Both: the peer may observe the update, and then observe the index | |
1297 | * decrement by the asynchronous completion callback. Who knows what | |
1298 | * badness that will cause. | |
1299 | */ | |
793c20e9 | 1300 | hdr->flags = 0; |
74465645 | 1301 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 | 1302 | |
e26a5843 | 1303 | return rc; |
fce8a7bb JM |
1304 | } |
1305 | ||
e26a5843 | 1306 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1307 | { |
e26a5843 | 1308 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1309 | int rc, i; |
fce8a7bb | 1310 | |
e26a5843 AH |
1311 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1312 | __func__, qp->qp_num); | |
e8aeb60c | 1313 | |
c336acd3 JM |
1314 | /* Limit the number of packets processed in a single interrupt to |
1315 | * provide fairness to others | |
1316 | */ | |
1317 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1318 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1319 | if (rc) |
1320 | break; | |
1321 | } | |
282a2fee JM |
1322 | |
1323 | if (qp->dma_chan) | |
1324 | dma_async_issue_pending(qp->dma_chan); | |
fce8a7bb | 1325 | |
e26a5843 AH |
1326 | if (i == qp->rx_max_entry) { |
1327 | /* there is more work to do */ | |
1328 | tasklet_schedule(&qp->rxc_db_work); | |
1329 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { | |
1330 | /* the doorbell bit is set: clear it */ | |
1331 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1332 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1333 | ntb_db_read(qp->ndev); | |
1334 | ||
1335 | /* an interrupt may have arrived between finishing | |
1336 | * ntb_process_rxc and clearing the doorbell bit: | |
1337 | * there might be some more work to do. | |
1338 | */ | |
1339 | tasklet_schedule(&qp->rxc_db_work); | |
1340 | } | |
fce8a7bb JM |
1341 | } |
1342 | ||
282a2fee | 1343 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1344 | { |
282a2fee JM |
1345 | struct ntb_queue_entry *entry = data; |
1346 | struct ntb_transport_qp *qp = entry->qp; | |
1347 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1348 | |
74465645 | 1349 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1350 | |
e26a5843 | 1351 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1352 | |
1353 | /* The entry length can only be zero if the packet is intended to be a | |
1354 | * "link down" or similar. Since no payload is being sent in these | |
1355 | * cases, there is nothing to add to the completion queue. | |
1356 | */ | |
1357 | if (entry->len > 0) { | |
1358 | qp->tx_bytes += entry->len; | |
1359 | ||
1360 | if (qp->tx_handler) | |
1361 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1362 | entry->len); | |
1363 | } | |
1364 | ||
1365 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1366 | } | |
1367 | ||
282a2fee | 1368 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1369 | { |
282a2fee JM |
1370 | memcpy_toio(offset, entry->buf, entry->len); |
1371 | ||
e26a5843 AH |
1372 | /* Ensure that the data is fully copied out before setting the flags */ |
1373 | wmb(); | |
1374 | ||
282a2fee JM |
1375 | ntb_tx_copy_callback(entry); |
1376 | } | |
1377 | ||
1378 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1379 | struct ntb_queue_entry *entry) | |
1380 | { | |
1381 | struct ntb_payload_header __iomem *hdr; | |
1382 | struct dma_async_tx_descriptor *txd; | |
1383 | struct dma_chan *chan = qp->dma_chan; | |
1384 | struct dma_device *device; | |
1385 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1386 | struct dmaengine_unmap_data *unmap; |
1387 | dma_addr_t dest; | |
282a2fee | 1388 | dma_cookie_t cookie; |
74465645 | 1389 | void __iomem *offset; |
282a2fee JM |
1390 | size_t len = entry->len; |
1391 | void *buf = entry->buf; | |
fce8a7bb | 1392 | |
793c20e9 | 1393 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1394 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1395 | entry->tx_hdr = hdr; | |
fce8a7bb | 1396 | |
282a2fee | 1397 | iowrite32(entry->len, &hdr->len); |
e26a5843 | 1398 | iowrite32((u32)qp->tx_pkts, &hdr->ver); |
282a2fee JM |
1399 | |
1400 | if (!chan) | |
1401 | goto err; | |
1402 | ||
1403 | if (len < copy_bytes) | |
1404 | goto err; | |
1405 | ||
1406 | device = chan->device; | |
1407 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
e26a5843 AH |
1408 | buff_off = (size_t)buf & ~PAGE_MASK; |
1409 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1410 | |
1411 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1412 | goto err; | |
1413 | ||
6f57fd05 BZ |
1414 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1415 | if (!unmap) | |
282a2fee JM |
1416 | goto err; |
1417 | ||
6f57fd05 BZ |
1418 | unmap->len = len; |
1419 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1420 | buff_off, len, DMA_TO_DEVICE); | |
1421 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1422 | goto err_get_unmap; | |
1423 | ||
1424 | unmap->to_cnt = 1; | |
1425 | ||
6f57fd05 | 1426 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
0776ae7b | 1427 | DMA_PREP_INTERRUPT); |
282a2fee | 1428 | if (!txd) |
6f57fd05 | 1429 | goto err_get_unmap; |
282a2fee JM |
1430 | |
1431 | txd->callback = ntb_tx_copy_callback; | |
1432 | txd->callback_param = entry; | |
6f57fd05 | 1433 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1434 | |
1435 | cookie = dmaengine_submit(txd); | |
1436 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1437 | goto err_set_unmap; |
1438 | ||
1439 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1440 | |
1441 | dma_async_issue_pending(chan); | |
1442 | qp->tx_async++; | |
1443 | ||
1444 | return; | |
6f57fd05 BZ |
1445 | err_set_unmap: |
1446 | dmaengine_unmap_put(unmap); | |
1447 | err_get_unmap: | |
1448 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1449 | err: |
1450 | ntb_memcpy_tx(entry, offset); | |
1451 | qp->tx_memcpy++; | |
1452 | } | |
1453 | ||
1454 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1455 | struct ntb_queue_entry *entry) | |
1456 | { | |
793c20e9 | 1457 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1458 | qp->tx_ring_full++; |
1459 | return -EAGAIN; | |
1460 | } | |
1461 | ||
ef114ed5 | 1462 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1463 | if (qp->tx_handler) |
1464 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1465 | ||
1466 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1467 | &qp->tx_free_q); | |
1468 | return 0; | |
1469 | } | |
1470 | ||
282a2fee | 1471 | ntb_async_tx(qp, entry); |
fce8a7bb | 1472 | |
793c20e9 JM |
1473 | qp->tx_index++; |
1474 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1475 | |
1476 | qp->tx_pkts++; | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1482 | { | |
e26a5843 | 1483 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1484 | struct ntb_queue_entry *entry; |
1485 | int i, rc; | |
1486 | ||
e26a5843 | 1487 | if (!qp->link_is_up) |
fce8a7bb JM |
1488 | return; |
1489 | ||
e22e0b9d | 1490 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1491 | |
1492 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1493 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1494 | if (entry) |
1495 | break; | |
1496 | msleep(100); | |
1497 | } | |
1498 | ||
1499 | if (!entry) | |
1500 | return; | |
1501 | ||
1502 | entry->cb_data = NULL; | |
1503 | entry->buf = NULL; | |
1504 | entry->len = 0; | |
1505 | entry->flags = LINK_DOWN_FLAG; | |
1506 | ||
1507 | rc = ntb_process_tx(qp, entry); | |
1508 | if (rc) | |
1509 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1510 | qp->qp_num); | |
2849b5d7 AH |
1511 | |
1512 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1513 | } |
1514 | ||
1515 | /** | |
1516 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1517 | * @rx_handler: receive callback function | |
1518 | * @tx_handler: transmit callback function | |
1519 | * @event_handler: event callback function | |
1520 | * | |
1521 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1522 | * routine for both transmit and receive. The receive callback routine will be | |
1523 | * used to pass up data when the transport has received it on the queue. The | |
1524 | * transmit callback routine will be called when the transport has completed the | |
1525 | * transmission of the data on the queue and the data is ready to be freed. | |
1526 | * | |
1527 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1528 | */ | |
1529 | struct ntb_transport_qp * | |
e26a5843 | 1530 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1531 | const struct ntb_queue_handlers *handlers) |
1532 | { | |
e26a5843 AH |
1533 | struct ntb_dev *ndev; |
1534 | struct pci_dev *pdev; | |
1535 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1536 | struct ntb_queue_entry *entry; |
1537 | struct ntb_transport_qp *qp; | |
e26a5843 | 1538 | u64 qp_bit; |
fce8a7bb | 1539 | unsigned int free_queue; |
e26a5843 | 1540 | int i; |
fce8a7bb | 1541 | |
e26a5843 AH |
1542 | ndev = dev_ntb(client_dev->parent); |
1543 | pdev = ndev->pdev; | |
1544 | nt = ndev->ctx; | |
fce8a7bb JM |
1545 | |
1546 | free_queue = ffs(nt->qp_bitmap); | |
1547 | if (!free_queue) | |
1548 | goto err; | |
1549 | ||
1550 | /* decrement free_queue to make it zero based */ | |
1551 | free_queue--; | |
1552 | ||
e26a5843 AH |
1553 | qp = &nt->qp_vec[free_queue]; |
1554 | qp_bit = BIT_ULL(qp->qp_num); | |
1555 | ||
1556 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1557 | |
fce8a7bb JM |
1558 | qp->cb_data = data; |
1559 | qp->rx_handler = handlers->rx_handler; | |
1560 | qp->tx_handler = handlers->tx_handler; | |
1561 | qp->event_handler = handlers->event_handler; | |
1562 | ||
94681194 | 1563 | dmaengine_get(); |
282a2fee | 1564 | qp->dma_chan = dma_find_channel(DMA_MEMCPY); |
94681194 JM |
1565 | if (!qp->dma_chan) { |
1566 | dmaengine_put(); | |
282a2fee | 1567 | dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n"); |
94681194 | 1568 | } |
282a2fee | 1569 | |
fce8a7bb | 1570 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
e26a5843 | 1571 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
fce8a7bb JM |
1572 | if (!entry) |
1573 | goto err1; | |
1574 | ||
282a2fee | 1575 | entry->qp = qp; |
fce8a7bb | 1576 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, |
f766755c | 1577 | &qp->rx_free_q); |
fce8a7bb JM |
1578 | } |
1579 | ||
1580 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
e26a5843 | 1581 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
fce8a7bb JM |
1582 | if (!entry) |
1583 | goto err2; | |
1584 | ||
282a2fee | 1585 | entry->qp = qp; |
fce8a7bb | 1586 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1587 | &qp->tx_free_q); |
fce8a7bb JM |
1588 | } |
1589 | ||
e26a5843 AH |
1590 | ntb_db_clear(qp->ndev, qp_bit); |
1591 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1592 | |
1593 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1594 | ||
1595 | return qp; | |
1596 | ||
fce8a7bb | 1597 | err2: |
f766755c | 1598 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1599 | kfree(entry); |
1600 | err1: | |
f766755c | 1601 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1602 | kfree(entry); |
94681194 JM |
1603 | if (qp->dma_chan) |
1604 | dmaengine_put(); | |
e26a5843 | 1605 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1606 | err: |
1607 | return NULL; | |
1608 | } | |
1609 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1610 | ||
1611 | /** | |
1612 | * ntb_transport_free_queue - Frees NTB transport queue | |
1613 | * @qp: NTB queue to be freed | |
1614 | * | |
1615 | * Frees NTB transport queue | |
1616 | */ | |
1617 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1618 | { | |
e26a5843 | 1619 | struct ntb_transport_ctx *nt = qp->transport; |
186f27ff | 1620 | struct pci_dev *pdev; |
fce8a7bb | 1621 | struct ntb_queue_entry *entry; |
e26a5843 | 1622 | u64 qp_bit; |
fce8a7bb JM |
1623 | |
1624 | if (!qp) | |
1625 | return; | |
1626 | ||
e26a5843 | 1627 | pdev = qp->ndev->pdev; |
186f27ff | 1628 | |
282a2fee JM |
1629 | if (qp->dma_chan) { |
1630 | struct dma_chan *chan = qp->dma_chan; | |
1631 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1632 | * processed by the CPU instead of the DAM engine | |
1633 | */ | |
1634 | qp->dma_chan = NULL; | |
1635 | ||
1636 | /* Try to be nice and wait for any queued DMA engine | |
1637 | * transactions to process before smashing it with a rock | |
1638 | */ | |
1639 | dma_sync_wait(chan, qp->last_cookie); | |
1640 | dmaengine_terminate_all(chan); | |
1641 | dmaengine_put(); | |
1642 | } | |
fce8a7bb | 1643 | |
e26a5843 AH |
1644 | qp_bit = BIT_ULL(qp->qp_num); |
1645 | ||
1646 | ntb_db_set_mask(qp->ndev, qp_bit); | |
1647 | tasklet_disable(&qp->rxc_db_work); | |
fce8a7bb | 1648 | |
282a2fee JM |
1649 | cancel_delayed_work_sync(&qp->link_work); |
1650 | ||
e26a5843 AH |
1651 | qp->cb_data = NULL; |
1652 | qp->rx_handler = NULL; | |
1653 | qp->tx_handler = NULL; | |
1654 | qp->event_handler = NULL; | |
1655 | ||
f766755c | 1656 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1657 | kfree(entry); |
1658 | ||
f766755c | 1659 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1660 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1661 | kfree(entry); | |
1662 | } | |
1663 | ||
f766755c | 1664 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1665 | kfree(entry); |
1666 | ||
e26a5843 | 1667 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1668 | |
1669 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1670 | } | |
1671 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1672 | ||
1673 | /** | |
1674 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1675 | * @qp: NTB queue to be freed | |
1676 | * @len: pointer to variable to write enqueued buffers length | |
1677 | * | |
1678 | * Dequeues unused buffers from receive queue. Should only be used during | |
1679 | * shutdown of qp. | |
1680 | * | |
1681 | * RETURNS: NULL error value on error, or void* for success. | |
1682 | */ | |
1683 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1684 | { | |
1685 | struct ntb_queue_entry *entry; | |
1686 | void *buf; | |
1687 | ||
e26a5843 | 1688 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1689 | return NULL; |
1690 | ||
1691 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1692 | if (!entry) | |
1693 | return NULL; | |
1694 | ||
1695 | buf = entry->cb_data; | |
1696 | *len = entry->len; | |
1697 | ||
f766755c | 1698 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1699 | |
1700 | return buf; | |
1701 | } | |
1702 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1703 | ||
1704 | /** | |
1705 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1706 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1707 | * @cb: per buffer pointer for callback function to use | |
1708 | * @data: pointer to data buffer that incoming packets will be copied into | |
1709 | * @len: length of the data buffer | |
1710 | * | |
1711 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1712 | * payload can be received into. | |
1713 | * | |
1714 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1715 | */ | |
1716 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1717 | unsigned int len) | |
1718 | { | |
1719 | struct ntb_queue_entry *entry; | |
1720 | ||
1721 | if (!qp) | |
1722 | return -EINVAL; | |
1723 | ||
1724 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1725 | if (!entry) | |
1726 | return -ENOMEM; | |
1727 | ||
1728 | entry->cb_data = cb; | |
1729 | entry->buf = data; | |
1730 | entry->len = len; | |
1731 | ||
f766755c | 1732 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1733 | |
1734 | return 0; | |
1735 | } | |
1736 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1737 | ||
1738 | /** | |
1739 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1740 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1741 | * @cb: per buffer pointer for callback function to use | |
1742 | * @data: pointer to data buffer that will be sent | |
1743 | * @len: length of the data buffer | |
1744 | * | |
1745 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1746 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1747 | * serialize access to the qp. |
1748 | * | |
1749 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1750 | */ | |
1751 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1752 | unsigned int len) | |
1753 | { | |
1754 | struct ntb_queue_entry *entry; | |
1755 | int rc; | |
1756 | ||
e26a5843 | 1757 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
1758 | return -EINVAL; |
1759 | ||
1760 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1761 | if (!entry) { |
1762 | qp->tx_err_no_buf++; | |
fce8a7bb | 1763 | return -ENOMEM; |
282a2fee | 1764 | } |
fce8a7bb JM |
1765 | |
1766 | entry->cb_data = cb; | |
1767 | entry->buf = data; | |
1768 | entry->len = len; | |
1769 | entry->flags = 0; | |
1770 | ||
1771 | rc = ntb_process_tx(qp, entry); | |
1772 | if (rc) | |
1773 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1774 | &qp->tx_free_q); | |
1775 | ||
1776 | return rc; | |
1777 | } | |
1778 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1779 | ||
1780 | /** | |
1781 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1782 | * @qp: NTB transport layer queue to be enabled | |
1783 | * | |
1784 | * Notify NTB transport layer of client readiness to use queue | |
1785 | */ | |
1786 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1787 | { | |
1788 | if (!qp) | |
1789 | return; | |
1790 | ||
e26a5843 | 1791 | qp->client_ready = true; |
fce8a7bb | 1792 | |
e26a5843 | 1793 | if (qp->transport->link_is_up) |
fce8a7bb JM |
1794 | schedule_delayed_work(&qp->link_work, 0); |
1795 | } | |
1796 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1797 | ||
1798 | /** | |
1799 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1800 | * @qp: NTB transport layer queue to be disabled | |
1801 | * | |
1802 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1803 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1804 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1805 | */ |
1806 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1807 | { | |
186f27ff | 1808 | struct pci_dev *pdev; |
e26a5843 | 1809 | int val; |
fce8a7bb JM |
1810 | |
1811 | if (!qp) | |
1812 | return; | |
1813 | ||
e26a5843 AH |
1814 | pdev = qp->ndev->pdev; |
1815 | qp->client_ready = false; | |
fce8a7bb | 1816 | |
e26a5843 | 1817 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 1818 | |
e26a5843 AH |
1819 | ntb_peer_spad_write(qp->ndev, QP_LINKS, |
1820 | val & ~BIT(qp->qp_num)); | |
fce8a7bb | 1821 | |
e26a5843 | 1822 | if (qp->link_is_up) |
fce8a7bb JM |
1823 | ntb_send_link_down(qp); |
1824 | else | |
1825 | cancel_delayed_work_sync(&qp->link_work); | |
1826 | } | |
1827 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1828 | ||
1829 | /** | |
1830 | * ntb_transport_link_query - Query transport link state | |
1831 | * @qp: NTB transport layer queue to be queried | |
1832 | * | |
1833 | * Query connectivity to the remote system of the NTB transport queue | |
1834 | * | |
1835 | * RETURNS: true for link up or false for link down | |
1836 | */ | |
1837 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1838 | { | |
186f27ff JM |
1839 | if (!qp) |
1840 | return false; | |
1841 | ||
e26a5843 | 1842 | return qp->link_is_up; |
fce8a7bb JM |
1843 | } |
1844 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1845 | ||
1846 | /** | |
1847 | * ntb_transport_qp_num - Query the qp number | |
1848 | * @qp: NTB transport layer queue to be queried | |
1849 | * | |
1850 | * Query qp number of the NTB transport queue | |
1851 | * | |
1852 | * RETURNS: a zero based number specifying the qp number | |
1853 | */ | |
1854 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1855 | { | |
186f27ff JM |
1856 | if (!qp) |
1857 | return 0; | |
1858 | ||
fce8a7bb JM |
1859 | return qp->qp_num; |
1860 | } | |
1861 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1862 | ||
1863 | /** | |
1864 | * ntb_transport_max_size - Query the max payload size of a qp | |
1865 | * @qp: NTB transport layer queue to be queried | |
1866 | * | |
1867 | * Query the maximum payload size permissible on the given qp | |
1868 | * | |
1869 | * RETURNS: the max payload size of a qp | |
1870 | */ | |
ef114ed5 | 1871 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1872 | { |
282a2fee JM |
1873 | unsigned int max; |
1874 | ||
186f27ff JM |
1875 | if (!qp) |
1876 | return 0; | |
1877 | ||
282a2fee JM |
1878 | if (!qp->dma_chan) |
1879 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1880 | ||
1881 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1882 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1883 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1884 | ||
1885 | return max; | |
fce8a7bb JM |
1886 | } |
1887 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 AH |
1888 | |
1889 | static void ntb_transport_doorbell_callback(void *data, int vector) | |
1890 | { | |
1891 | struct ntb_transport_ctx *nt = data; | |
1892 | struct ntb_transport_qp *qp; | |
1893 | u64 db_bits; | |
1894 | unsigned int qp_num; | |
1895 | ||
1896 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
1897 | ntb_db_vector_mask(nt->ndev, vector)); | |
1898 | ||
1899 | while (db_bits) { | |
1900 | qp_num = __ffs(db_bits); | |
1901 | qp = &nt->qp_vec[qp_num]; | |
1902 | ||
1903 | tasklet_schedule(&qp->rxc_db_work); | |
1904 | ||
1905 | db_bits &= ~BIT_ULL(qp_num); | |
1906 | } | |
1907 | } | |
1908 | ||
1909 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
1910 | .link_event = ntb_transport_event_callback, | |
1911 | .db_event = ntb_transport_doorbell_callback, | |
1912 | }; | |
1913 | ||
1914 | static struct ntb_client ntb_transport_client = { | |
1915 | .ops = { | |
1916 | .probe = ntb_transport_probe, | |
1917 | .remove = ntb_transport_free, | |
1918 | }, | |
1919 | }; | |
1920 | ||
1921 | static int __init ntb_transport_init(void) | |
1922 | { | |
1923 | int rc; | |
1924 | ||
1925 | if (debugfs_initialized()) | |
1926 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
1927 | ||
1928 | rc = bus_register(&ntb_transport_bus); | |
1929 | if (rc) | |
1930 | goto err_bus; | |
1931 | ||
1932 | rc = ntb_register_client(&ntb_transport_client); | |
1933 | if (rc) | |
1934 | goto err_client; | |
1935 | ||
1936 | return 0; | |
1937 | ||
1938 | err_client: | |
1939 | bus_unregister(&ntb_transport_bus); | |
1940 | err_bus: | |
1941 | debugfs_remove_recursive(nt_debugfs_dir); | |
1942 | return rc; | |
1943 | } | |
1944 | module_init(ntb_transport_init); | |
1945 | ||
1946 | static void __exit ntb_transport_exit(void) | |
1947 | { | |
1948 | debugfs_remove_recursive(nt_debugfs_dir); | |
1949 | ||
1950 | ntb_unregister_client(&ntb_transport_client); | |
1951 | bus_unregister(&ntb_transport_bus); | |
1952 | } | |
1953 | module_exit(ntb_transport_exit); |