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; |
1199aa61 | 349 | int node; |
8b19d450 | 350 | int rc, i = 0; |
fce8a7bb | 351 | |
8222b402 JM |
352 | if (list_empty(&ntb_transport_list)) |
353 | return -ENODEV; | |
354 | ||
fce8a7bb JM |
355 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
356 | struct device *dev; | |
357 | ||
1199aa61 AH |
358 | node = dev_to_node(&nt->ndev->dev); |
359 | ||
360 | client_dev = kzalloc_node(sizeof(*client_dev), | |
361 | GFP_KERNEL, node); | |
fce8a7bb JM |
362 | if (!client_dev) { |
363 | rc = -ENOMEM; | |
364 | goto err; | |
365 | } | |
366 | ||
367 | dev = &client_dev->dev; | |
368 | ||
369 | /* setup and register client devices */ | |
8b19d450 | 370 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
371 | dev->bus = &ntb_transport_bus; |
372 | dev->release = ntb_transport_client_release; | |
373 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
374 | |
375 | rc = device_register(dev); | |
376 | if (rc) { | |
377 | kfree(client_dev); | |
378 | goto err; | |
379 | } | |
380 | ||
381 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 382 | i++; |
fce8a7bb JM |
383 | } |
384 | ||
385 | return 0; | |
386 | ||
387 | err: | |
e26a5843 | 388 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
389 | |
390 | return rc; | |
391 | } | |
e26a5843 | 392 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
393 | |
394 | /** | |
ec110bc7 | 395 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
396 | * @drv: NTB client driver to be registered |
397 | * | |
398 | * Register an NTB client driver with the NTB transport layer | |
399 | * | |
400 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
401 | */ | |
e26a5843 | 402 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 403 | { |
e26a5843 | 404 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 405 | |
8222b402 JM |
406 | if (list_empty(&ntb_transport_list)) |
407 | return -ENODEV; | |
408 | ||
fce8a7bb JM |
409 | return driver_register(&drv->driver); |
410 | } | |
ec110bc7 | 411 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
412 | |
413 | /** | |
ec110bc7 | 414 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
415 | * @drv: NTB client driver to be unregistered |
416 | * | |
417 | * Unregister an NTB client driver with the NTB transport layer | |
418 | * | |
419 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
420 | */ | |
e26a5843 | 421 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
422 | { |
423 | driver_unregister(&drv->driver); | |
424 | } | |
ec110bc7 | 425 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 426 | |
fce8a7bb JM |
427 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
428 | loff_t *offp) | |
429 | { | |
430 | struct ntb_transport_qp *qp; | |
d7237e22 | 431 | char *buf; |
fce8a7bb JM |
432 | ssize_t ret, out_offset, out_count; |
433 | ||
282a2fee | 434 | out_count = 1000; |
d7237e22 JM |
435 | |
436 | buf = kmalloc(out_count, GFP_KERNEL); | |
437 | if (!buf) | |
438 | return -ENOMEM; | |
fce8a7bb JM |
439 | |
440 | qp = filp->private_data; | |
441 | out_offset = 0; | |
442 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
443 | "NTB QP stats\n"); | |
444 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
445 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
446 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
447 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
448 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
449 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
450 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
451 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
452 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
453 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
454 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
455 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
456 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
457 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
458 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
459 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
460 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 461 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 462 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 463 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 464 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 465 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
466 | |
467 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
468 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
469 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
470 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
471 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
472 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
473 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
474 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
475 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
476 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
477 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
478 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 479 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 480 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 481 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 482 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 483 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 484 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
485 | |
486 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
e26a5843 AH |
487 | "\nQP Link %s\n", |
488 | qp->link_is_up ? "Up" : "Down"); | |
d7237e22 JM |
489 | if (out_offset > out_count) |
490 | out_offset = out_count; | |
fce8a7bb JM |
491 | |
492 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 493 | kfree(buf); |
fce8a7bb JM |
494 | return ret; |
495 | } | |
496 | ||
497 | static const struct file_operations ntb_qp_debugfs_stats = { | |
498 | .owner = THIS_MODULE, | |
d66d7ac2 | 499 | .open = simple_open, |
fce8a7bb JM |
500 | .read = debugfs_read, |
501 | }; | |
502 | ||
503 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
504 | struct list_head *list) | |
505 | { | |
506 | unsigned long flags; | |
507 | ||
508 | spin_lock_irqsave(lock, flags); | |
509 | list_add_tail(entry, list); | |
510 | spin_unlock_irqrestore(lock, flags); | |
511 | } | |
512 | ||
513 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 514 | struct list_head *list) |
fce8a7bb JM |
515 | { |
516 | struct ntb_queue_entry *entry; | |
517 | unsigned long flags; | |
518 | ||
519 | spin_lock_irqsave(lock, flags); | |
520 | if (list_empty(list)) { | |
521 | entry = NULL; | |
522 | goto out; | |
523 | } | |
524 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
525 | list_del(&entry->entry); | |
526 | out: | |
527 | spin_unlock_irqrestore(lock, flags); | |
528 | ||
529 | return entry; | |
530 | } | |
531 | ||
e26a5843 AH |
532 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
533 | unsigned int qp_num) | |
fce8a7bb | 534 | { |
e26a5843 AH |
535 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
536 | struct ntb_transport_mw *mw; | |
ef114ed5 | 537 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 538 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 539 | unsigned int i; |
fce8a7bb | 540 | |
e26a5843 AH |
541 | mw_count = nt->mw_count; |
542 | qp_count = nt->qp_count; | |
948d3a65 | 543 | |
e26a5843 AH |
544 | mw_num = QP_TO_MW(nt, qp_num); |
545 | mw = &nt->mw_vec[mw_num]; | |
546 | ||
547 | if (!mw->virt_addr) | |
548 | return -ENOMEM; | |
fce8a7bb | 549 | |
e26a5843 AH |
550 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
551 | num_qps_mw = qp_count / mw_count + 1; | |
fce8a7bb | 552 | else |
e26a5843 | 553 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 554 | |
e26a5843 AH |
555 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
556 | qp->rx_buff = mw->virt_addr + rx_size * qp_num / mw_count; | |
793c20e9 JM |
557 | rx_size -= sizeof(struct ntb_rx_info); |
558 | ||
282a2fee JM |
559 | qp->remote_rx_info = qp->rx_buff + rx_size; |
560 | ||
c9d534c8 JM |
561 | /* Due to housekeeping, there must be atleast 2 buffs */ |
562 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
563 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
564 | qp->rx_index = 0; | |
565 | ||
c9d534c8 | 566 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 567 | |
ef114ed5 | 568 | /* setup the hdr offsets with 0's */ |
793c20e9 | 569 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
570 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
571 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 572 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 573 | } |
fce8a7bb JM |
574 | |
575 | qp->rx_pkts = 0; | |
576 | qp->tx_pkts = 0; | |
90f9e934 | 577 | qp->tx_index = 0; |
e26a5843 AH |
578 | |
579 | return 0; | |
fce8a7bb JM |
580 | } |
581 | ||
e26a5843 | 582 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 583 | { |
e26a5843 AH |
584 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
585 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
586 | |
587 | if (!mw->virt_addr) | |
588 | return; | |
589 | ||
e26a5843 AH |
590 | ntb_mw_clear_trans(nt->ndev, num_mw); |
591 | dma_free_coherent(&pdev->dev, mw->buff_size, | |
592 | mw->virt_addr, mw->dma_addr); | |
593 | mw->xlat_size = 0; | |
594 | mw->buff_size = 0; | |
b77b2637 JM |
595 | mw->virt_addr = NULL; |
596 | } | |
597 | ||
e26a5843 AH |
598 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
599 | unsigned int size) | |
fce8a7bb | 600 | { |
e26a5843 AH |
601 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
602 | struct pci_dev *pdev = nt->ndev->pdev; | |
603 | unsigned int xlat_size, buff_size; | |
604 | int rc; | |
605 | ||
606 | xlat_size = round_up(size, mw->xlat_align_size); | |
607 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 608 | |
b77b2637 | 609 | /* No need to re-setup */ |
e26a5843 | 610 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
611 | return 0; |
612 | ||
e26a5843 | 613 | if (mw->buff_size) |
b77b2637 JM |
614 | ntb_free_mw(nt, num_mw); |
615 | ||
e26a5843 AH |
616 | /* Alloc memory for receiving data. Must be aligned */ |
617 | mw->xlat_size = xlat_size; | |
618 | mw->buff_size = buff_size; | |
fce8a7bb | 619 | |
e26a5843 AH |
620 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
621 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 622 | if (!mw->virt_addr) { |
e26a5843 AH |
623 | mw->xlat_size = 0; |
624 | mw->buff_size = 0; | |
625 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %d\n", | |
626 | buff_size); | |
fce8a7bb JM |
627 | return -ENOMEM; |
628 | } | |
629 | ||
3cc5ba19 DJ |
630 | /* |
631 | * we must ensure that the memory address allocated is BAR size | |
632 | * aligned in order for the XLAT register to take the value. This | |
633 | * is a requirement of the hardware. It is recommended to setup CMA | |
634 | * for BAR sizes equal or greater than 4MB. | |
635 | */ | |
e26a5843 AH |
636 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
637 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
638 | &mw->dma_addr); |
639 | ntb_free_mw(nt, num_mw); | |
640 | return -ENOMEM; | |
641 | } | |
642 | ||
fce8a7bb | 643 | /* Notify HW the memory location of the receive buffer */ |
e26a5843 AH |
644 | rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
645 | if (rc) { | |
646 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
647 | ntb_free_mw(nt, num_mw); | |
648 | return -EIO; | |
649 | } | |
fce8a7bb JM |
650 | |
651 | return 0; | |
652 | } | |
653 | ||
2849b5d7 AH |
654 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
655 | { | |
656 | qp->link_is_up = false; | |
657 | ||
658 | qp->tx_index = 0; | |
659 | qp->rx_index = 0; | |
660 | qp->rx_bytes = 0; | |
661 | qp->rx_pkts = 0; | |
662 | qp->rx_ring_empty = 0; | |
663 | qp->rx_err_no_buf = 0; | |
664 | qp->rx_err_oflow = 0; | |
665 | qp->rx_err_ver = 0; | |
666 | qp->rx_memcpy = 0; | |
667 | qp->rx_async = 0; | |
668 | qp->tx_bytes = 0; | |
669 | qp->tx_pkts = 0; | |
670 | qp->tx_ring_full = 0; | |
671 | qp->tx_err_no_buf = 0; | |
672 | qp->tx_memcpy = 0; | |
673 | qp->tx_async = 0; | |
674 | } | |
675 | ||
fca4d518 | 676 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 677 | { |
e26a5843 AH |
678 | struct ntb_transport_ctx *nt = qp->transport; |
679 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 680 | |
e22e0b9d | 681 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
682 | |
683 | cancel_delayed_work_sync(&qp->link_work); | |
684 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
685 | |
686 | if (qp->event_handler) | |
687 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
688 | } |
689 | ||
690 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
691 | { | |
692 | struct ntb_transport_qp *qp = container_of(work, | |
693 | struct ntb_transport_qp, | |
694 | link_cleanup); | |
e26a5843 | 695 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
696 | |
697 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 698 | |
e26a5843 | 699 | if (nt->link_is_up) |
fce8a7bb JM |
700 | schedule_delayed_work(&qp->link_work, |
701 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
702 | } | |
703 | ||
7b4f2d3c JM |
704 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
705 | { | |
706 | schedule_work(&qp->link_cleanup); | |
707 | } | |
708 | ||
e26a5843 | 709 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 710 | { |
e26a5843 AH |
711 | struct ntb_transport_qp *qp; |
712 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
713 | int i; |
714 | ||
e26a5843 AH |
715 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
716 | ||
fca4d518 | 717 | /* Pass along the info to any clients */ |
e26a5843 AH |
718 | for (i = 0; i < nt->qp_count; i++) |
719 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
720 | qp = &nt->qp_vec[i]; | |
721 | ntb_qp_link_cleanup(qp); | |
722 | cancel_work_sync(&qp->link_cleanup); | |
723 | cancel_delayed_work_sync(&qp->link_work); | |
724 | } | |
fca4d518 | 725 | |
e26a5843 | 726 | if (!nt->link_is_up) |
fce8a7bb | 727 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 728 | |
fce8a7bb JM |
729 | /* The scratchpad registers keep the values if the remote side |
730 | * goes down, blast them now to give them a sane value the next | |
731 | * time they are accessed | |
732 | */ | |
733 | for (i = 0; i < MAX_SPAD; i++) | |
e26a5843 | 734 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
735 | } |
736 | ||
fca4d518 JM |
737 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
738 | { | |
e26a5843 AH |
739 | struct ntb_transport_ctx *nt = |
740 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
741 | |
742 | ntb_transport_link_cleanup(nt); | |
743 | } | |
744 | ||
e26a5843 | 745 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 746 | { |
e26a5843 | 747 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 748 | |
e26a5843 | 749 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 750 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 751 | else |
7b4f2d3c | 752 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
753 | } |
754 | ||
755 | static void ntb_transport_link_work(struct work_struct *work) | |
756 | { | |
e26a5843 AH |
757 | struct ntb_transport_ctx *nt = |
758 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
759 | struct ntb_dev *ndev = nt->ndev; | |
760 | struct pci_dev *pdev = ndev->pdev; | |
761 | resource_size_t size; | |
fce8a7bb | 762 | u32 val; |
e26a5843 | 763 | int rc, i, spad; |
fce8a7bb | 764 | |
113fc505 | 765 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
766 | for (i = 0; i < nt->mw_count; i++) { |
767 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 768 | |
e26a5843 AH |
769 | if (max_mw_size && size > max_mw_size) |
770 | size = max_mw_size; | |
fce8a7bb | 771 | |
e26a5843 AH |
772 | spad = MW0_SZ_HIGH + (i * 2); |
773 | ntb_peer_spad_write(ndev, spad, (u32)(size >> 32)); | |
fce8a7bb | 774 | |
e26a5843 AH |
775 | spad = MW0_SZ_LOW + (i * 2); |
776 | ntb_peer_spad_write(ndev, spad, (u32)size); | |
fce8a7bb JM |
777 | } |
778 | ||
e26a5843 | 779 | ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
fce8a7bb | 780 | |
e26a5843 | 781 | ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
fce8a7bb | 782 | |
e26a5843 | 783 | ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 784 | |
e26a5843 | 785 | /* Query the remote side for its info */ |
0f69a7df | 786 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
787 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
788 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 789 | goto out; |
fce8a7bb | 790 | |
0f69a7df | 791 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 792 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 793 | if (val != nt->qp_count) |
fce8a7bb | 794 | goto out; |
fce8a7bb | 795 | |
0f69a7df | 796 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 797 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
798 | if (val != nt->mw_count) |
799 | goto out; | |
fce8a7bb | 800 | |
e26a5843 | 801 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 802 | u64 val64; |
fce8a7bb | 803 | |
0f69a7df | 804 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 805 | val64 = (u64)val << 32; |
113fc505 | 806 | |
0f69a7df | 807 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
808 | val64 |= val; |
809 | ||
e26a5843 | 810 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
811 | |
812 | rc = ntb_set_mw(nt, i, val64); | |
813 | if (rc) | |
814 | goto out1; | |
815 | } | |
fce8a7bb | 816 | |
e26a5843 | 817 | nt->link_is_up = true; |
fce8a7bb | 818 | |
e26a5843 AH |
819 | for (i = 0; i < nt->qp_count; i++) { |
820 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
821 | |
822 | ntb_transport_setup_qp_mw(nt, i); | |
823 | ||
e26a5843 | 824 | if (qp->client_ready) |
fce8a7bb JM |
825 | schedule_delayed_work(&qp->link_work, 0); |
826 | } | |
827 | ||
828 | return; | |
829 | ||
113fc505 | 830 | out1: |
e26a5843 | 831 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 832 | ntb_free_mw(nt, i); |
fce8a7bb | 833 | out: |
e26a5843 | 834 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
835 | schedule_delayed_work(&nt->link_work, |
836 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
837 | } | |
838 | ||
839 | static void ntb_qp_link_work(struct work_struct *work) | |
840 | { | |
841 | struct ntb_transport_qp *qp = container_of(work, | |
842 | struct ntb_transport_qp, | |
843 | link_work.work); | |
e26a5843 AH |
844 | struct pci_dev *pdev = qp->ndev->pdev; |
845 | struct ntb_transport_ctx *nt = qp->transport; | |
846 | int val; | |
fce8a7bb | 847 | |
e26a5843 | 848 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 849 | |
e26a5843 | 850 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 851 | |
e26a5843 | 852 | ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
853 | |
854 | /* query remote spad for qp ready bits */ | |
e26a5843 | 855 | ntb_peer_spad_read(nt->ndev, QP_LINKS); |
28762289 | 856 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
857 | |
858 | /* See if the remote side is up */ | |
e26a5843 | 859 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 860 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 AH |
861 | qp->link_is_up = true; |
862 | ||
fce8a7bb | 863 | if (qp->event_handler) |
e26a5843 AH |
864 | qp->event_handler(qp->cb_data, qp->link_is_up); |
865 | } else if (nt->link_is_up) | |
fce8a7bb JM |
866 | schedule_delayed_work(&qp->link_work, |
867 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
868 | } | |
869 | ||
e26a5843 | 870 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 871 | unsigned int qp_num) |
fce8a7bb JM |
872 | { |
873 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
874 | struct ntb_transport_mw *mw; |
875 | phys_addr_t mw_base; | |
876 | resource_size_t mw_size; | |
ef114ed5 | 877 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 878 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 879 | u64 qp_offset; |
948d3a65 | 880 | |
e26a5843 AH |
881 | mw_count = nt->mw_count; |
882 | qp_count = nt->qp_count; | |
fce8a7bb | 883 | |
e26a5843 AH |
884 | mw_num = QP_TO_MW(nt, qp_num); |
885 | mw = &nt->mw_vec[mw_num]; | |
886 | ||
887 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
888 | qp->qp_num = qp_num; |
889 | qp->transport = nt; | |
890 | qp->ndev = nt->ndev; | |
e26a5843 | 891 | qp->client_ready = false; |
fce8a7bb | 892 | qp->event_handler = NULL; |
2849b5d7 | 893 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 894 | |
e26a5843 AH |
895 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
896 | num_qps_mw = qp_count / mw_count + 1; | |
ef114ed5 | 897 | else |
e26a5843 AH |
898 | num_qps_mw = qp_count / mw_count; |
899 | ||
900 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
901 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 902 | |
e26a5843 AH |
903 | tx_size = (unsigned int)mw_size / num_qps_mw; |
904 | qp_offset = tx_size * qp_num / mw_count; | |
905 | ||
906 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
907 | if (!qp->tx_mw) |
908 | return -EINVAL; | |
909 | ||
e26a5843 | 910 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
911 | if (!qp->tx_mw_phys) |
912 | return -EINVAL; | |
913 | ||
793c20e9 | 914 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 915 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 916 | |
c9d534c8 JM |
917 | /* Due to housekeeping, there must be atleast 2 buffs */ |
918 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 919 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 920 | |
e26a5843 | 921 | if (nt_debugfs_dir) { |
fce8a7bb JM |
922 | char debugfs_name[4]; |
923 | ||
924 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
925 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
e26a5843 | 926 | nt_debugfs_dir); |
fce8a7bb JM |
927 | |
928 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
929 | qp->debugfs_dir, qp, | |
930 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
931 | } else { |
932 | qp->debugfs_dir = NULL; | |
933 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
934 | } |
935 | ||
936 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 937 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb JM |
938 | |
939 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
940 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
941 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
942 | ||
943 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
944 | INIT_LIST_HEAD(&qp->rx_free_q); | |
945 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 946 | |
e26a5843 AH |
947 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
948 | (unsigned long)qp); | |
949 | ||
282a2fee | 950 | return 0; |
fce8a7bb JM |
951 | } |
952 | ||
e26a5843 | 953 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 954 | { |
e26a5843 AH |
955 | struct ntb_transport_ctx *nt; |
956 | struct ntb_transport_mw *mw; | |
957 | unsigned int mw_count, qp_count; | |
958 | u64 qp_bitmap; | |
1199aa61 | 959 | int node; |
fce8a7bb JM |
960 | int rc, i; |
961 | ||
e26a5843 AH |
962 | if (ntb_db_is_unsafe(ndev)) |
963 | dev_dbg(&ndev->dev, | |
964 | "doorbell is unsafe, proceed anyway...\n"); | |
965 | if (ntb_spad_is_unsafe(ndev)) | |
966 | dev_dbg(&ndev->dev, | |
967 | "scratchpad is unsafe, proceed anyway...\n"); | |
968 | ||
1199aa61 AH |
969 | node = dev_to_node(&ndev->dev); |
970 | ||
971 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
972 | if (!nt) |
973 | return -ENOMEM; | |
974 | ||
e26a5843 AH |
975 | nt->ndev = ndev; |
976 | ||
977 | mw_count = ntb_mw_count(ndev); | |
978 | ||
979 | nt->mw_count = mw_count; | |
980 | ||
1199aa61 AH |
981 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
982 | GFP_KERNEL, node); | |
e26a5843 AH |
983 | if (!nt->mw_vec) { |
984 | rc = -ENOMEM; | |
fce8a7bb JM |
985 | goto err; |
986 | } | |
987 | ||
e26a5843 AH |
988 | for (i = 0; i < mw_count; i++) { |
989 | mw = &nt->mw_vec[i]; | |
990 | ||
991 | rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, | |
992 | &mw->xlat_align, &mw->xlat_align_size); | |
993 | if (rc) | |
994 | goto err1; | |
995 | ||
996 | mw->vbase = ioremap(mw->phys_addr, mw->phys_size); | |
997 | if (!mw->vbase) { | |
998 | rc = -ENOMEM; | |
999 | goto err1; | |
1000 | } | |
1001 | ||
1002 | mw->buff_size = 0; | |
1003 | mw->xlat_size = 0; | |
1004 | mw->virt_addr = NULL; | |
1005 | mw->dma_addr = 0; | |
948d3a65 JM |
1006 | } |
1007 | ||
e26a5843 AH |
1008 | qp_bitmap = ntb_db_valid_mask(ndev); |
1009 | ||
1010 | qp_count = ilog2(qp_bitmap); | |
1011 | if (max_num_clients && max_num_clients < qp_count) | |
1012 | qp_count = max_num_clients; | |
1013 | else if (mw_count < qp_count) | |
1014 | qp_count = mw_count; | |
1015 | ||
1016 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1017 | ||
1018 | nt->qp_count = qp_count; | |
1019 | nt->qp_bitmap = qp_bitmap; | |
1020 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1021 | |
1199aa61 AH |
1022 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1023 | GFP_KERNEL, node); | |
e26a5843 | 1024 | if (!nt->qp_vec) { |
fce8a7bb | 1025 | rc = -ENOMEM; |
948d3a65 | 1026 | goto err2; |
fce8a7bb JM |
1027 | } |
1028 | ||
e26a5843 | 1029 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1030 | rc = ntb_transport_init_queue(nt, i); |
1031 | if (rc) | |
1032 | goto err3; | |
1033 | } | |
fce8a7bb JM |
1034 | |
1035 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1036 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1037 | |
e26a5843 | 1038 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1039 | if (rc) |
948d3a65 | 1040 | goto err3; |
fce8a7bb JM |
1041 | |
1042 | INIT_LIST_HEAD(&nt->client_devs); | |
1043 | rc = ntb_bus_init(nt); | |
1044 | if (rc) | |
948d3a65 | 1045 | goto err4; |
fce8a7bb | 1046 | |
e26a5843 AH |
1047 | nt->link_is_up = false; |
1048 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1049 | ntb_link_event(ndev); | |
fce8a7bb JM |
1050 | |
1051 | return 0; | |
1052 | ||
948d3a65 | 1053 | err4: |
e26a5843 | 1054 | ntb_clear_ctx(ndev); |
948d3a65 | 1055 | err3: |
e26a5843 | 1056 | kfree(nt->qp_vec); |
948d3a65 | 1057 | err2: |
e26a5843 | 1058 | kfree(nt->mw_vec); |
fce8a7bb | 1059 | err1: |
e26a5843 AH |
1060 | while (i--) { |
1061 | mw = &nt->mw_vec[i]; | |
1062 | iounmap(mw->vbase); | |
1063 | } | |
fce8a7bb | 1064 | err: |
fce8a7bb JM |
1065 | kfree(nt); |
1066 | return rc; | |
1067 | } | |
1068 | ||
e26a5843 | 1069 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1070 | { |
e26a5843 AH |
1071 | struct ntb_transport_ctx *nt = ndev->ctx; |
1072 | struct ntb_transport_qp *qp; | |
1073 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1074 | int i; |
1075 | ||
fca4d518 | 1076 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1077 | cancel_work_sync(&nt->link_cleanup); |
1078 | cancel_delayed_work_sync(&nt->link_work); | |
1079 | ||
1080 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1081 | |
1082 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1083 | for (i = 0; i < nt->qp_count; i++) { |
1084 | qp = &nt->qp_vec[i]; | |
1085 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1086 | ntb_transport_free_queue(qp); | |
1087 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1088 | } |
fce8a7bb | 1089 | |
e26a5843 AH |
1090 | ntb_link_disable(ndev); |
1091 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1092 | |
e26a5843 | 1093 | ntb_bus_remove(nt); |
fce8a7bb | 1094 | |
e26a5843 | 1095 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1096 | ntb_free_mw(nt, i); |
e26a5843 AH |
1097 | iounmap(nt->mw_vec[i].vbase); |
1098 | } | |
fce8a7bb | 1099 | |
e26a5843 AH |
1100 | kfree(nt->qp_vec); |
1101 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1102 | kfree(nt); |
1103 | } | |
1104 | ||
282a2fee | 1105 | static void ntb_rx_copy_callback(void *data) |
fce8a7bb | 1106 | { |
282a2fee JM |
1107 | struct ntb_queue_entry *entry = data; |
1108 | struct ntb_transport_qp *qp = entry->qp; | |
448c6fb3 JM |
1109 | void *cb_data = entry->cb_data; |
1110 | unsigned int len = entry->len; | |
282a2fee JM |
1111 | struct ntb_payload_header *hdr = entry->rx_hdr; |
1112 | ||
282a2fee | 1113 | hdr->flags = 0; |
fce8a7bb | 1114 | |
282a2fee | 1115 | iowrite32(entry->index, &qp->rx_info->entry); |
fce8a7bb JM |
1116 | |
1117 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 | 1118 | |
e26a5843 | 1119 | if (qp->rx_handler && qp->client_ready) |
448c6fb3 | 1120 | qp->rx_handler(qp, qp->cb_data, cb_data, len); |
fce8a7bb JM |
1121 | } |
1122 | ||
282a2fee JM |
1123 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1124 | { | |
1125 | void *buf = entry->buf; | |
1126 | size_t len = entry->len; | |
1127 | ||
1128 | memcpy(buf, offset, len); | |
1129 | ||
e26a5843 AH |
1130 | /* Ensure that the data is fully copied out before clearing the flag */ |
1131 | wmb(); | |
1132 | ||
282a2fee JM |
1133 | ntb_rx_copy_callback(entry); |
1134 | } | |
1135 | ||
1136 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset, | |
1137 | size_t len) | |
1138 | { | |
1139 | struct dma_async_tx_descriptor *txd; | |
1140 | struct ntb_transport_qp *qp = entry->qp; | |
1141 | struct dma_chan *chan = qp->dma_chan; | |
1142 | struct dma_device *device; | |
1143 | size_t pay_off, buff_off; | |
6f57fd05 | 1144 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1145 | dma_cookie_t cookie; |
1146 | void *buf = entry->buf; | |
282a2fee JM |
1147 | |
1148 | entry->len = len; | |
1149 | ||
1150 | if (!chan) | |
1151 | goto err; | |
1152 | ||
53ca4fea | 1153 | if (len < copy_bytes) |
6f57fd05 | 1154 | goto err_wait; |
282a2fee JM |
1155 | |
1156 | device = chan->device; | |
e26a5843 AH |
1157 | pay_off = (size_t)offset & ~PAGE_MASK; |
1158 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1159 | |
1160 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
6f57fd05 | 1161 | goto err_wait; |
282a2fee | 1162 | |
6f57fd05 BZ |
1163 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1164 | if (!unmap) | |
1165 | goto err_wait; | |
282a2fee | 1166 | |
6f57fd05 BZ |
1167 | unmap->len = len; |
1168 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1169 | pay_off, len, DMA_TO_DEVICE); | |
1170 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1171 | goto err_get_unmap; | |
1172 | ||
1173 | unmap->to_cnt = 1; | |
282a2fee | 1174 | |
6f57fd05 BZ |
1175 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1176 | buff_off, len, DMA_FROM_DEVICE); | |
1177 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1178 | goto err_get_unmap; | |
1179 | ||
1180 | unmap->from_cnt = 1; | |
1181 | ||
6f57fd05 | 1182 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
0776ae7b BZ |
1183 | unmap->addr[0], len, |
1184 | DMA_PREP_INTERRUPT); | |
282a2fee | 1185 | if (!txd) |
6f57fd05 | 1186 | goto err_get_unmap; |
282a2fee JM |
1187 | |
1188 | txd->callback = ntb_rx_copy_callback; | |
1189 | txd->callback_param = entry; | |
6f57fd05 | 1190 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1191 | |
1192 | cookie = dmaengine_submit(txd); | |
1193 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1194 | goto err_set_unmap; |
1195 | ||
1196 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1197 | |
1198 | qp->last_cookie = cookie; | |
1199 | ||
1200 | qp->rx_async++; | |
1201 | ||
1202 | return; | |
1203 | ||
6f57fd05 BZ |
1204 | err_set_unmap: |
1205 | dmaengine_unmap_put(unmap); | |
1206 | err_get_unmap: | |
1207 | dmaengine_unmap_put(unmap); | |
1208 | err_wait: | |
282a2fee JM |
1209 | /* If the callbacks come out of order, the writing of the index to the |
1210 | * last completed will be out of order. This may result in the | |
1211 | * receive stalling forever. | |
1212 | */ | |
1213 | dma_sync_wait(chan, qp->last_cookie); | |
1214 | err: | |
1215 | ntb_memcpy_rx(entry, offset); | |
1216 | qp->rx_memcpy++; | |
1217 | } | |
1218 | ||
fce8a7bb JM |
1219 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1220 | { | |
1221 | struct ntb_payload_header *hdr; | |
1222 | struct ntb_queue_entry *entry; | |
1223 | void *offset; | |
e26a5843 | 1224 | int rc; |
fce8a7bb | 1225 | |
793c20e9 JM |
1226 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1227 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1228 | ||
e26a5843 AH |
1229 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1230 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1231 | |
fce8a7bb | 1232 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1233 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1234 | qp->rx_ring_empty++; |
1235 | return -EAGAIN; | |
1236 | } | |
1237 | ||
e26a5843 AH |
1238 | if (hdr->flags & LINK_DOWN_FLAG) { |
1239 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1240 | ntb_qp_link_down(qp); | |
1241 | hdr->flags = 0; | |
c0900b33 | 1242 | return -EAGAIN; |
e26a5843 AH |
1243 | } |
1244 | ||
1245 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1246 | dev_dbg(&qp->ndev->pdev->dev, | |
1247 | "version mismatch, expected %llu - got %u\n", | |
1248 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1249 | qp->rx_err_ver++; |
1250 | return -EIO; | |
1251 | } | |
1252 | ||
e26a5843 AH |
1253 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
1254 | if (!entry) { | |
1255 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1256 | qp->rx_err_no_buf++; | |
fce8a7bb | 1257 | |
e26a5843 | 1258 | rc = -ENOMEM; |
282a2fee | 1259 | goto err; |
fce8a7bb JM |
1260 | } |
1261 | ||
282a2fee | 1262 | if (hdr->len > entry->len) { |
e26a5843 AH |
1263 | dev_dbg(&qp->ndev->pdev->dev, |
1264 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1265 | hdr->len, entry->len); |
e26a5843 | 1266 | qp->rx_err_oflow++; |
282a2fee | 1267 | |
e26a5843 | 1268 | rc = -EIO; |
282a2fee | 1269 | goto err; |
fce8a7bb JM |
1270 | } |
1271 | ||
e26a5843 AH |
1272 | dev_dbg(&qp->ndev->pdev->dev, |
1273 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1274 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
1275 | ||
1276 | qp->rx_bytes += hdr->len; | |
1277 | qp->rx_pkts++; | |
1278 | ||
282a2fee JM |
1279 | entry->index = qp->rx_index; |
1280 | entry->rx_hdr = hdr; | |
1281 | ||
1282 | ntb_async_rx(entry, offset, hdr->len); | |
fce8a7bb | 1283 | |
282a2fee JM |
1284 | qp->rx_index++; |
1285 | qp->rx_index %= qp->rx_max_entry; | |
1286 | ||
1287 | return 0; | |
1288 | ||
1289 | err: | |
e26a5843 AH |
1290 | /* FIXME: if this syncrhonous update of the rx_index gets ahead of |
1291 | * asyncrhonous ntb_rx_copy_callback of previous entry, there are three | |
1292 | * scenarios: | |
1293 | * | |
1294 | * 1) The peer might miss this update, but observe the update | |
1295 | * from the memcpy completion callback. In this case, the buffer will | |
1296 | * not be freed on the peer to be reused for a different packet. The | |
1297 | * successful rx of a later packet would clear the condition, but the | |
1298 | * condition could persist if several rx fail in a row. | |
1299 | * | |
1300 | * 2) The peer may observe this update before the asyncrhonous copy of | |
1301 | * prior packets is completed. The peer may overwrite the buffers of | |
1302 | * the prior packets before they are copied. | |
1303 | * | |
1304 | * 3) Both: the peer may observe the update, and then observe the index | |
1305 | * decrement by the asynchronous completion callback. Who knows what | |
1306 | * badness that will cause. | |
1307 | */ | |
793c20e9 | 1308 | hdr->flags = 0; |
74465645 | 1309 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 | 1310 | |
e26a5843 | 1311 | return rc; |
fce8a7bb JM |
1312 | } |
1313 | ||
e26a5843 | 1314 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1315 | { |
e26a5843 | 1316 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1317 | int rc, i; |
fce8a7bb | 1318 | |
e26a5843 AH |
1319 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1320 | __func__, qp->qp_num); | |
e8aeb60c | 1321 | |
c336acd3 JM |
1322 | /* Limit the number of packets processed in a single interrupt to |
1323 | * provide fairness to others | |
1324 | */ | |
1325 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1326 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1327 | if (rc) |
1328 | break; | |
1329 | } | |
282a2fee JM |
1330 | |
1331 | if (qp->dma_chan) | |
1332 | dma_async_issue_pending(qp->dma_chan); | |
fce8a7bb | 1333 | |
e26a5843 AH |
1334 | if (i == qp->rx_max_entry) { |
1335 | /* there is more work to do */ | |
1336 | tasklet_schedule(&qp->rxc_db_work); | |
1337 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { | |
1338 | /* the doorbell bit is set: clear it */ | |
1339 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1340 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1341 | ntb_db_read(qp->ndev); | |
1342 | ||
1343 | /* an interrupt may have arrived between finishing | |
1344 | * ntb_process_rxc and clearing the doorbell bit: | |
1345 | * there might be some more work to do. | |
1346 | */ | |
1347 | tasklet_schedule(&qp->rxc_db_work); | |
1348 | } | |
fce8a7bb JM |
1349 | } |
1350 | ||
282a2fee | 1351 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1352 | { |
282a2fee JM |
1353 | struct ntb_queue_entry *entry = data; |
1354 | struct ntb_transport_qp *qp = entry->qp; | |
1355 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1356 | |
74465645 | 1357 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1358 | |
e26a5843 | 1359 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1360 | |
1361 | /* The entry length can only be zero if the packet is intended to be a | |
1362 | * "link down" or similar. Since no payload is being sent in these | |
1363 | * cases, there is nothing to add to the completion queue. | |
1364 | */ | |
1365 | if (entry->len > 0) { | |
1366 | qp->tx_bytes += entry->len; | |
1367 | ||
1368 | if (qp->tx_handler) | |
1369 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1370 | entry->len); | |
1371 | } | |
1372 | ||
1373 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1374 | } | |
1375 | ||
282a2fee | 1376 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1377 | { |
282a2fee JM |
1378 | memcpy_toio(offset, entry->buf, entry->len); |
1379 | ||
e26a5843 AH |
1380 | /* Ensure that the data is fully copied out before setting the flags */ |
1381 | wmb(); | |
1382 | ||
282a2fee JM |
1383 | ntb_tx_copy_callback(entry); |
1384 | } | |
1385 | ||
1386 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1387 | struct ntb_queue_entry *entry) | |
1388 | { | |
1389 | struct ntb_payload_header __iomem *hdr; | |
1390 | struct dma_async_tx_descriptor *txd; | |
1391 | struct dma_chan *chan = qp->dma_chan; | |
1392 | struct dma_device *device; | |
1393 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1394 | struct dmaengine_unmap_data *unmap; |
1395 | dma_addr_t dest; | |
282a2fee | 1396 | dma_cookie_t cookie; |
74465645 | 1397 | void __iomem *offset; |
282a2fee JM |
1398 | size_t len = entry->len; |
1399 | void *buf = entry->buf; | |
fce8a7bb | 1400 | |
793c20e9 | 1401 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1402 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1403 | entry->tx_hdr = hdr; | |
fce8a7bb | 1404 | |
282a2fee | 1405 | iowrite32(entry->len, &hdr->len); |
e26a5843 | 1406 | iowrite32((u32)qp->tx_pkts, &hdr->ver); |
282a2fee JM |
1407 | |
1408 | if (!chan) | |
1409 | goto err; | |
1410 | ||
1411 | if (len < copy_bytes) | |
1412 | goto err; | |
1413 | ||
1414 | device = chan->device; | |
1415 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
e26a5843 AH |
1416 | buff_off = (size_t)buf & ~PAGE_MASK; |
1417 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1418 | |
1419 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1420 | goto err; | |
1421 | ||
6f57fd05 BZ |
1422 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1423 | if (!unmap) | |
282a2fee JM |
1424 | goto err; |
1425 | ||
6f57fd05 BZ |
1426 | unmap->len = len; |
1427 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1428 | buff_off, len, DMA_TO_DEVICE); | |
1429 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1430 | goto err_get_unmap; | |
1431 | ||
1432 | unmap->to_cnt = 1; | |
1433 | ||
6f57fd05 | 1434 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
0776ae7b | 1435 | DMA_PREP_INTERRUPT); |
282a2fee | 1436 | if (!txd) |
6f57fd05 | 1437 | goto err_get_unmap; |
282a2fee JM |
1438 | |
1439 | txd->callback = ntb_tx_copy_callback; | |
1440 | txd->callback_param = entry; | |
6f57fd05 | 1441 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1442 | |
1443 | cookie = dmaengine_submit(txd); | |
1444 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1445 | goto err_set_unmap; |
1446 | ||
1447 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1448 | |
1449 | dma_async_issue_pending(chan); | |
1450 | qp->tx_async++; | |
1451 | ||
1452 | return; | |
6f57fd05 BZ |
1453 | err_set_unmap: |
1454 | dmaengine_unmap_put(unmap); | |
1455 | err_get_unmap: | |
1456 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1457 | err: |
1458 | ntb_memcpy_tx(entry, offset); | |
1459 | qp->tx_memcpy++; | |
1460 | } | |
1461 | ||
1462 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1463 | struct ntb_queue_entry *entry) | |
1464 | { | |
793c20e9 | 1465 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1466 | qp->tx_ring_full++; |
1467 | return -EAGAIN; | |
1468 | } | |
1469 | ||
ef114ed5 | 1470 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1471 | if (qp->tx_handler) |
1472 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1473 | ||
1474 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1475 | &qp->tx_free_q); | |
1476 | return 0; | |
1477 | } | |
1478 | ||
282a2fee | 1479 | ntb_async_tx(qp, entry); |
fce8a7bb | 1480 | |
793c20e9 JM |
1481 | qp->tx_index++; |
1482 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1483 | |
1484 | qp->tx_pkts++; | |
1485 | ||
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1490 | { | |
e26a5843 | 1491 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1492 | struct ntb_queue_entry *entry; |
1493 | int i, rc; | |
1494 | ||
e26a5843 | 1495 | if (!qp->link_is_up) |
fce8a7bb JM |
1496 | return; |
1497 | ||
e22e0b9d | 1498 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1499 | |
1500 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1501 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1502 | if (entry) |
1503 | break; | |
1504 | msleep(100); | |
1505 | } | |
1506 | ||
1507 | if (!entry) | |
1508 | return; | |
1509 | ||
1510 | entry->cb_data = NULL; | |
1511 | entry->buf = NULL; | |
1512 | entry->len = 0; | |
1513 | entry->flags = LINK_DOWN_FLAG; | |
1514 | ||
1515 | rc = ntb_process_tx(qp, entry); | |
1516 | if (rc) | |
1517 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1518 | qp->qp_num); | |
2849b5d7 AH |
1519 | |
1520 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1521 | } |
1522 | ||
1199aa61 AH |
1523 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1524 | { | |
1525 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1526 | } | |
1527 | ||
fce8a7bb JM |
1528 | /** |
1529 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1530 | * @rx_handler: receive callback function | |
1531 | * @tx_handler: transmit callback function | |
1532 | * @event_handler: event callback function | |
1533 | * | |
1534 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1535 | * routine for both transmit and receive. The receive callback routine will be | |
1536 | * used to pass up data when the transport has received it on the queue. The | |
1537 | * transmit callback routine will be called when the transport has completed the | |
1538 | * transmission of the data on the queue and the data is ready to be freed. | |
1539 | * | |
1540 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1541 | */ | |
1542 | struct ntb_transport_qp * | |
e26a5843 | 1543 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1544 | const struct ntb_queue_handlers *handlers) |
1545 | { | |
e26a5843 AH |
1546 | struct ntb_dev *ndev; |
1547 | struct pci_dev *pdev; | |
1548 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1549 | struct ntb_queue_entry *entry; |
1550 | struct ntb_transport_qp *qp; | |
e26a5843 | 1551 | u64 qp_bit; |
fce8a7bb | 1552 | unsigned int free_queue; |
1199aa61 AH |
1553 | dma_cap_mask_t dma_mask; |
1554 | int node; | |
e26a5843 | 1555 | int i; |
fce8a7bb | 1556 | |
e26a5843 AH |
1557 | ndev = dev_ntb(client_dev->parent); |
1558 | pdev = ndev->pdev; | |
1559 | nt = ndev->ctx; | |
fce8a7bb | 1560 | |
1199aa61 AH |
1561 | node = dev_to_node(&ndev->dev); |
1562 | ||
fce8a7bb JM |
1563 | free_queue = ffs(nt->qp_bitmap); |
1564 | if (!free_queue) | |
1565 | goto err; | |
1566 | ||
1567 | /* decrement free_queue to make it zero based */ | |
1568 | free_queue--; | |
1569 | ||
e26a5843 AH |
1570 | qp = &nt->qp_vec[free_queue]; |
1571 | qp_bit = BIT_ULL(qp->qp_num); | |
1572 | ||
1573 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1574 | |
fce8a7bb JM |
1575 | qp->cb_data = data; |
1576 | qp->rx_handler = handlers->rx_handler; | |
1577 | qp->tx_handler = handlers->tx_handler; | |
1578 | qp->event_handler = handlers->event_handler; | |
1579 | ||
1199aa61 AH |
1580 | dma_cap_zero(dma_mask); |
1581 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1582 | ||
1583 | qp->dma_chan = dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1584 | (void *)(unsigned long)node); | |
1585 | if (!qp->dma_chan) | |
282a2fee | 1586 | dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n"); |
282a2fee | 1587 | |
fce8a7bb | 1588 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1589 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1590 | if (!entry) |
1591 | goto err1; | |
1592 | ||
282a2fee | 1593 | entry->qp = qp; |
fce8a7bb | 1594 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, |
f766755c | 1595 | &qp->rx_free_q); |
fce8a7bb JM |
1596 | } |
1597 | ||
1598 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1199aa61 | 1599 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1600 | if (!entry) |
1601 | goto err2; | |
1602 | ||
282a2fee | 1603 | entry->qp = qp; |
fce8a7bb | 1604 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1605 | &qp->tx_free_q); |
fce8a7bb JM |
1606 | } |
1607 | ||
e26a5843 AH |
1608 | ntb_db_clear(qp->ndev, qp_bit); |
1609 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1610 | |
1611 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1612 | ||
1613 | return qp; | |
1614 | ||
fce8a7bb | 1615 | err2: |
f766755c | 1616 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1617 | kfree(entry); |
1618 | err1: | |
f766755c | 1619 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1620 | kfree(entry); |
94681194 | 1621 | if (qp->dma_chan) |
1199aa61 | 1622 | dma_release_channel(qp->dma_chan); |
e26a5843 | 1623 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1624 | err: |
1625 | return NULL; | |
1626 | } | |
1627 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1628 | ||
1629 | /** | |
1630 | * ntb_transport_free_queue - Frees NTB transport queue | |
1631 | * @qp: NTB queue to be freed | |
1632 | * | |
1633 | * Frees NTB transport queue | |
1634 | */ | |
1635 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1636 | { | |
e26a5843 | 1637 | struct ntb_transport_ctx *nt = qp->transport; |
186f27ff | 1638 | struct pci_dev *pdev; |
fce8a7bb | 1639 | struct ntb_queue_entry *entry; |
e26a5843 | 1640 | u64 qp_bit; |
fce8a7bb JM |
1641 | |
1642 | if (!qp) | |
1643 | return; | |
1644 | ||
e26a5843 | 1645 | pdev = qp->ndev->pdev; |
186f27ff | 1646 | |
282a2fee JM |
1647 | if (qp->dma_chan) { |
1648 | struct dma_chan *chan = qp->dma_chan; | |
1649 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1650 | * processed by the CPU instead of the DAM engine | |
1651 | */ | |
1652 | qp->dma_chan = NULL; | |
1653 | ||
1654 | /* Try to be nice and wait for any queued DMA engine | |
1655 | * transactions to process before smashing it with a rock | |
1656 | */ | |
1657 | dma_sync_wait(chan, qp->last_cookie); | |
1658 | dmaengine_terminate_all(chan); | |
1199aa61 | 1659 | dma_release_channel(chan); |
282a2fee | 1660 | } |
fce8a7bb | 1661 | |
e26a5843 AH |
1662 | qp_bit = BIT_ULL(qp->qp_num); |
1663 | ||
1664 | ntb_db_set_mask(qp->ndev, qp_bit); | |
1665 | tasklet_disable(&qp->rxc_db_work); | |
fce8a7bb | 1666 | |
282a2fee JM |
1667 | cancel_delayed_work_sync(&qp->link_work); |
1668 | ||
e26a5843 AH |
1669 | qp->cb_data = NULL; |
1670 | qp->rx_handler = NULL; | |
1671 | qp->tx_handler = NULL; | |
1672 | qp->event_handler = NULL; | |
1673 | ||
f766755c | 1674 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1675 | kfree(entry); |
1676 | ||
f766755c | 1677 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1678 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1679 | kfree(entry); | |
1680 | } | |
1681 | ||
f766755c | 1682 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1683 | kfree(entry); |
1684 | ||
e26a5843 | 1685 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1686 | |
1687 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1688 | } | |
1689 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1690 | ||
1691 | /** | |
1692 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1693 | * @qp: NTB queue to be freed | |
1694 | * @len: pointer to variable to write enqueued buffers length | |
1695 | * | |
1696 | * Dequeues unused buffers from receive queue. Should only be used during | |
1697 | * shutdown of qp. | |
1698 | * | |
1699 | * RETURNS: NULL error value on error, or void* for success. | |
1700 | */ | |
1701 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1702 | { | |
1703 | struct ntb_queue_entry *entry; | |
1704 | void *buf; | |
1705 | ||
e26a5843 | 1706 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1707 | return NULL; |
1708 | ||
1709 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1710 | if (!entry) | |
1711 | return NULL; | |
1712 | ||
1713 | buf = entry->cb_data; | |
1714 | *len = entry->len; | |
1715 | ||
f766755c | 1716 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1717 | |
1718 | return buf; | |
1719 | } | |
1720 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1721 | ||
1722 | /** | |
1723 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1724 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1725 | * @cb: per buffer pointer for callback function to use | |
1726 | * @data: pointer to data buffer that incoming packets will be copied into | |
1727 | * @len: length of the data buffer | |
1728 | * | |
1729 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1730 | * payload can be received into. | |
1731 | * | |
1732 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1733 | */ | |
1734 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1735 | unsigned int len) | |
1736 | { | |
1737 | struct ntb_queue_entry *entry; | |
1738 | ||
1739 | if (!qp) | |
1740 | return -EINVAL; | |
1741 | ||
1742 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1743 | if (!entry) | |
1744 | return -ENOMEM; | |
1745 | ||
1746 | entry->cb_data = cb; | |
1747 | entry->buf = data; | |
1748 | entry->len = len; | |
1749 | ||
f766755c | 1750 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1751 | |
1752 | return 0; | |
1753 | } | |
1754 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1755 | ||
1756 | /** | |
1757 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1758 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1759 | * @cb: per buffer pointer for callback function to use | |
1760 | * @data: pointer to data buffer that will be sent | |
1761 | * @len: length of the data buffer | |
1762 | * | |
1763 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1764 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1765 | * serialize access to the qp. |
1766 | * | |
1767 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1768 | */ | |
1769 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1770 | unsigned int len) | |
1771 | { | |
1772 | struct ntb_queue_entry *entry; | |
1773 | int rc; | |
1774 | ||
e26a5843 | 1775 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
1776 | return -EINVAL; |
1777 | ||
1778 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1779 | if (!entry) { |
1780 | qp->tx_err_no_buf++; | |
fce8a7bb | 1781 | return -ENOMEM; |
282a2fee | 1782 | } |
fce8a7bb JM |
1783 | |
1784 | entry->cb_data = cb; | |
1785 | entry->buf = data; | |
1786 | entry->len = len; | |
1787 | entry->flags = 0; | |
1788 | ||
1789 | rc = ntb_process_tx(qp, entry); | |
1790 | if (rc) | |
1791 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1792 | &qp->tx_free_q); | |
1793 | ||
1794 | return rc; | |
1795 | } | |
1796 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1797 | ||
1798 | /** | |
1799 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1800 | * @qp: NTB transport layer queue to be enabled | |
1801 | * | |
1802 | * Notify NTB transport layer of client readiness to use queue | |
1803 | */ | |
1804 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1805 | { | |
1806 | if (!qp) | |
1807 | return; | |
1808 | ||
e26a5843 | 1809 | qp->client_ready = true; |
fce8a7bb | 1810 | |
e26a5843 | 1811 | if (qp->transport->link_is_up) |
fce8a7bb JM |
1812 | schedule_delayed_work(&qp->link_work, 0); |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1815 | ||
1816 | /** | |
1817 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1818 | * @qp: NTB transport layer queue to be disabled | |
1819 | * | |
1820 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1821 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1822 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1823 | */ |
1824 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1825 | { | |
186f27ff | 1826 | struct pci_dev *pdev; |
e26a5843 | 1827 | int val; |
fce8a7bb JM |
1828 | |
1829 | if (!qp) | |
1830 | return; | |
1831 | ||
e26a5843 AH |
1832 | pdev = qp->ndev->pdev; |
1833 | qp->client_ready = false; | |
fce8a7bb | 1834 | |
e26a5843 | 1835 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 1836 | |
e26a5843 AH |
1837 | ntb_peer_spad_write(qp->ndev, QP_LINKS, |
1838 | val & ~BIT(qp->qp_num)); | |
fce8a7bb | 1839 | |
e26a5843 | 1840 | if (qp->link_is_up) |
fce8a7bb JM |
1841 | ntb_send_link_down(qp); |
1842 | else | |
1843 | cancel_delayed_work_sync(&qp->link_work); | |
1844 | } | |
1845 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1846 | ||
1847 | /** | |
1848 | * ntb_transport_link_query - Query transport link state | |
1849 | * @qp: NTB transport layer queue to be queried | |
1850 | * | |
1851 | * Query connectivity to the remote system of the NTB transport queue | |
1852 | * | |
1853 | * RETURNS: true for link up or false for link down | |
1854 | */ | |
1855 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1856 | { | |
186f27ff JM |
1857 | if (!qp) |
1858 | return false; | |
1859 | ||
e26a5843 | 1860 | return qp->link_is_up; |
fce8a7bb JM |
1861 | } |
1862 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1863 | ||
1864 | /** | |
1865 | * ntb_transport_qp_num - Query the qp number | |
1866 | * @qp: NTB transport layer queue to be queried | |
1867 | * | |
1868 | * Query qp number of the NTB transport queue | |
1869 | * | |
1870 | * RETURNS: a zero based number specifying the qp number | |
1871 | */ | |
1872 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1873 | { | |
186f27ff JM |
1874 | if (!qp) |
1875 | return 0; | |
1876 | ||
fce8a7bb JM |
1877 | return qp->qp_num; |
1878 | } | |
1879 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1880 | ||
1881 | /** | |
1882 | * ntb_transport_max_size - Query the max payload size of a qp | |
1883 | * @qp: NTB transport layer queue to be queried | |
1884 | * | |
1885 | * Query the maximum payload size permissible on the given qp | |
1886 | * | |
1887 | * RETURNS: the max payload size of a qp | |
1888 | */ | |
ef114ed5 | 1889 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1890 | { |
282a2fee JM |
1891 | unsigned int max; |
1892 | ||
186f27ff JM |
1893 | if (!qp) |
1894 | return 0; | |
1895 | ||
282a2fee JM |
1896 | if (!qp->dma_chan) |
1897 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1898 | ||
1899 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1900 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1901 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1902 | ||
1903 | return max; | |
fce8a7bb JM |
1904 | } |
1905 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 AH |
1906 | |
1907 | static void ntb_transport_doorbell_callback(void *data, int vector) | |
1908 | { | |
1909 | struct ntb_transport_ctx *nt = data; | |
1910 | struct ntb_transport_qp *qp; | |
1911 | u64 db_bits; | |
1912 | unsigned int qp_num; | |
1913 | ||
1914 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
1915 | ntb_db_vector_mask(nt->ndev, vector)); | |
1916 | ||
1917 | while (db_bits) { | |
1918 | qp_num = __ffs(db_bits); | |
1919 | qp = &nt->qp_vec[qp_num]; | |
1920 | ||
1921 | tasklet_schedule(&qp->rxc_db_work); | |
1922 | ||
1923 | db_bits &= ~BIT_ULL(qp_num); | |
1924 | } | |
1925 | } | |
1926 | ||
1927 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
1928 | .link_event = ntb_transport_event_callback, | |
1929 | .db_event = ntb_transport_doorbell_callback, | |
1930 | }; | |
1931 | ||
1932 | static struct ntb_client ntb_transport_client = { | |
1933 | .ops = { | |
1934 | .probe = ntb_transport_probe, | |
1935 | .remove = ntb_transport_free, | |
1936 | }, | |
1937 | }; | |
1938 | ||
1939 | static int __init ntb_transport_init(void) | |
1940 | { | |
1941 | int rc; | |
1942 | ||
1943 | if (debugfs_initialized()) | |
1944 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
1945 | ||
1946 | rc = bus_register(&ntb_transport_bus); | |
1947 | if (rc) | |
1948 | goto err_bus; | |
1949 | ||
1950 | rc = ntb_register_client(&ntb_transport_client); | |
1951 | if (rc) | |
1952 | goto err_client; | |
1953 | ||
1954 | return 0; | |
1955 | ||
1956 | err_client: | |
1957 | bus_unregister(&ntb_transport_bus); | |
1958 | err_bus: | |
1959 | debugfs_remove_recursive(nt_debugfs_dir); | |
1960 | return rc; | |
1961 | } | |
1962 | module_init(ntb_transport_init); | |
1963 | ||
1964 | static void __exit ntb_transport_exit(void) | |
1965 | { | |
1966 | debugfs_remove_recursive(nt_debugfs_dir); | |
1967 | ||
1968 | ntb_unregister_client(&ntb_transport_client); | |
1969 | bus_unregister(&ntb_transport_bus); | |
1970 | } | |
1971 | module_exit(ntb_transport_exit); |