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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> | |
06917f75 | 61 | #include <linux/uaccess.h> |
e26a5843 AH |
62 | #include "linux/ntb.h" |
63 | #include "linux/ntb_transport.h" | |
fce8a7bb | 64 | |
e26a5843 AH |
65 | #define NTB_TRANSPORT_VERSION 4 |
66 | #define NTB_TRANSPORT_VER "4" | |
67 | #define NTB_TRANSPORT_NAME "ntb_transport" | |
68 | #define NTB_TRANSPORT_DESC "Software Queue-Pair Transport over NTB" | |
69 | ||
70 | MODULE_DESCRIPTION(NTB_TRANSPORT_DESC); | |
71 | MODULE_VERSION(NTB_TRANSPORT_VER); | |
72 | MODULE_LICENSE("Dual BSD/GPL"); | |
73 | MODULE_AUTHOR("Intel Corporation"); | |
74 | ||
75 | static unsigned long max_mw_size; | |
76 | module_param(max_mw_size, ulong, 0644); | |
77 | MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows"); | |
fce8a7bb | 78 | |
9891417d | 79 | static unsigned int transport_mtu = 0x10000; |
fce8a7bb JM |
80 | module_param(transport_mtu, uint, 0644); |
81 | MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets"); | |
82 | ||
948d3a65 | 83 | static unsigned char max_num_clients; |
fce8a7bb JM |
84 | module_param(max_num_clients, byte, 0644); |
85 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
86 | ||
282a2fee JM |
87 | static unsigned int copy_bytes = 1024; |
88 | module_param(copy_bytes, uint, 0644); | |
89 | MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA"); | |
90 | ||
a41ef053 DJ |
91 | static bool use_dma; |
92 | module_param(use_dma, bool, 0644); | |
93 | MODULE_PARM_DESC(use_dma, "Use DMA engine to perform large data copy"); | |
94 | ||
e26a5843 AH |
95 | static struct dentry *nt_debugfs_dir; |
96 | ||
fce8a7bb JM |
97 | struct ntb_queue_entry { |
98 | /* ntb_queue list reference */ | |
99 | struct list_head entry; | |
e26a5843 | 100 | /* pointers to data to be transferred */ |
fce8a7bb JM |
101 | void *cb_data; |
102 | void *buf; | |
103 | unsigned int len; | |
104 | unsigned int flags; | |
282a2fee JM |
105 | |
106 | struct ntb_transport_qp *qp; | |
107 | union { | |
108 | struct ntb_payload_header __iomem *tx_hdr; | |
109 | struct ntb_payload_header *rx_hdr; | |
110 | }; | |
111 | unsigned int index; | |
fce8a7bb JM |
112 | }; |
113 | ||
793c20e9 JM |
114 | struct ntb_rx_info { |
115 | unsigned int entry; | |
116 | }; | |
117 | ||
fce8a7bb | 118 | struct ntb_transport_qp { |
e26a5843 AH |
119 | struct ntb_transport_ctx *transport; |
120 | struct ntb_dev *ndev; | |
fce8a7bb | 121 | void *cb_data; |
282a2fee | 122 | struct dma_chan *dma_chan; |
fce8a7bb JM |
123 | |
124 | bool client_ready; | |
e26a5843 AH |
125 | bool link_is_up; |
126 | ||
fce8a7bb | 127 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 128 | u64 qp_bit; |
fce8a7bb | 129 | |
74465645 | 130 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
131 | struct ntb_rx_info *remote_rx_info; |
132 | ||
53ca4fea JM |
133 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
134 | void *data, int len); | |
fce8a7bb JM |
135 | struct list_head tx_free_q; |
136 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 137 | void __iomem *tx_mw; |
282a2fee | 138 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
139 | unsigned int tx_index; |
140 | unsigned int tx_max_entry; | |
ef114ed5 | 141 | unsigned int tx_max_frame; |
fce8a7bb | 142 | |
53ca4fea JM |
143 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
144 | void *data, int len); | |
fce8a7bb JM |
145 | struct list_head rx_pend_q; |
146 | struct list_head rx_free_q; | |
147 | spinlock_t ntb_rx_pend_q_lock; | |
148 | spinlock_t ntb_rx_free_q_lock; | |
793c20e9 JM |
149 | void *rx_buff; |
150 | unsigned int rx_index; | |
151 | unsigned int rx_max_entry; | |
ef114ed5 | 152 | unsigned int rx_max_frame; |
282a2fee | 153 | dma_cookie_t last_cookie; |
e26a5843 | 154 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 155 | |
53ca4fea | 156 | void (*event_handler)(void *data, int status); |
fce8a7bb | 157 | struct delayed_work link_work; |
7b4f2d3c | 158 | struct work_struct link_cleanup; |
fce8a7bb JM |
159 | |
160 | struct dentry *debugfs_dir; | |
161 | struct dentry *debugfs_stats; | |
162 | ||
163 | /* Stats */ | |
164 | u64 rx_bytes; | |
165 | u64 rx_pkts; | |
166 | u64 rx_ring_empty; | |
167 | u64 rx_err_no_buf; | |
168 | u64 rx_err_oflow; | |
169 | u64 rx_err_ver; | |
282a2fee JM |
170 | u64 rx_memcpy; |
171 | u64 rx_async; | |
fce8a7bb JM |
172 | u64 tx_bytes; |
173 | u64 tx_pkts; | |
174 | u64 tx_ring_full; | |
282a2fee JM |
175 | u64 tx_err_no_buf; |
176 | u64 tx_memcpy; | |
177 | u64 tx_async; | |
fce8a7bb JM |
178 | }; |
179 | ||
180 | struct ntb_transport_mw { | |
e26a5843 AH |
181 | phys_addr_t phys_addr; |
182 | resource_size_t phys_size; | |
183 | resource_size_t xlat_align; | |
184 | resource_size_t xlat_align_size; | |
185 | void __iomem *vbase; | |
186 | size_t xlat_size; | |
187 | size_t buff_size; | |
fce8a7bb JM |
188 | void *virt_addr; |
189 | dma_addr_t dma_addr; | |
190 | }; | |
191 | ||
192 | struct ntb_transport_client_dev { | |
193 | struct list_head entry; | |
e26a5843 | 194 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
195 | struct device dev; |
196 | }; | |
197 | ||
e26a5843 | 198 | struct ntb_transport_ctx { |
fce8a7bb JM |
199 | struct list_head entry; |
200 | struct list_head client_devs; | |
201 | ||
e26a5843 AH |
202 | struct ntb_dev *ndev; |
203 | ||
204 | struct ntb_transport_mw *mw_vec; | |
205 | struct ntb_transport_qp *qp_vec; | |
206 | unsigned int mw_count; | |
207 | unsigned int qp_count; | |
208 | u64 qp_bitmap; | |
209 | u64 qp_bitmap_free; | |
210 | ||
211 | bool link_is_up; | |
fce8a7bb | 212 | struct delayed_work link_work; |
7b4f2d3c | 213 | struct work_struct link_cleanup; |
fce8a7bb JM |
214 | }; |
215 | ||
216 | enum { | |
e26a5843 AH |
217 | DESC_DONE_FLAG = BIT(0), |
218 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
219 | }; |
220 | ||
221 | struct ntb_payload_header { | |
74465645 | 222 | unsigned int ver; |
fce8a7bb JM |
223 | unsigned int len; |
224 | unsigned int flags; | |
225 | }; | |
226 | ||
227 | enum { | |
228 | VERSION = 0, | |
fce8a7bb | 229 | QP_LINKS, |
113fc505 JM |
230 | NUM_QPS, |
231 | NUM_MWS, | |
232 | MW0_SZ_HIGH, | |
233 | MW0_SZ_LOW, | |
234 | MW1_SZ_HIGH, | |
235 | MW1_SZ_LOW, | |
fce8a7bb JM |
236 | MAX_SPAD, |
237 | }; | |
238 | ||
e26a5843 AH |
239 | #define dev_client_dev(__dev) \ |
240 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
241 | ||
242 | #define drv_client(__drv) \ | |
243 | container_of((__drv), struct ntb_transport_client, driver) | |
244 | ||
245 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
246 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
247 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
248 | ||
e26a5843 AH |
249 | static void ntb_transport_rxc_db(unsigned long data); |
250 | static const struct ntb_ctx_ops ntb_transport_ops; | |
251 | static struct ntb_client ntb_transport_client; | |
252 | ||
253 | static int ntb_transport_bus_match(struct device *dev, | |
254 | struct device_driver *drv) | |
fce8a7bb JM |
255 | { |
256 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
257 | } | |
258 | ||
e26a5843 | 259 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 260 | { |
e26a5843 | 261 | const struct ntb_transport_client *client; |
fce8a7bb JM |
262 | int rc = -EINVAL; |
263 | ||
264 | get_device(dev); | |
e26a5843 AH |
265 | |
266 | client = drv_client(dev->driver); | |
267 | rc = client->probe(dev); | |
fce8a7bb JM |
268 | if (rc) |
269 | put_device(dev); | |
270 | ||
271 | return rc; | |
272 | } | |
273 | ||
e26a5843 | 274 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 275 | { |
e26a5843 | 276 | const struct ntb_transport_client *client; |
fce8a7bb | 277 | |
e26a5843 AH |
278 | client = drv_client(dev->driver); |
279 | client->remove(dev); | |
fce8a7bb JM |
280 | |
281 | put_device(dev); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
e26a5843 AH |
286 | static struct bus_type ntb_transport_bus = { |
287 | .name = "ntb_transport", | |
288 | .match = ntb_transport_bus_match, | |
289 | .probe = ntb_transport_bus_probe, | |
290 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
291 | }; |
292 | ||
293 | static LIST_HEAD(ntb_transport_list); | |
294 | ||
e26a5843 | 295 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 296 | { |
fce8a7bb | 297 | list_add(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
298 | return 0; |
299 | } | |
300 | ||
e26a5843 | 301 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
302 | { |
303 | struct ntb_transport_client_dev *client_dev, *cd; | |
304 | ||
305 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
306 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
307 | dev_name(&client_dev->dev)); | |
308 | list_del(&client_dev->entry); | |
309 | device_unregister(&client_dev->dev); | |
310 | } | |
311 | ||
312 | list_del(&nt->entry); | |
fce8a7bb JM |
313 | } |
314 | ||
e26a5843 | 315 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
316 | { |
317 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 318 | |
e26a5843 | 319 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
320 | kfree(client_dev); |
321 | } | |
322 | ||
323 | /** | |
e26a5843 | 324 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
325 | * @device_name: Name of NTB client device |
326 | * | |
327 | * Unregister an NTB client device with the NTB transport layer | |
328 | */ | |
e26a5843 | 329 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
330 | { |
331 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 332 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
333 | |
334 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
335 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
336 | if (!strncmp(dev_name(&client->dev), device_name, | |
337 | strlen(device_name))) { | |
338 | list_del(&client->entry); | |
339 | device_unregister(&client->dev); | |
340 | } | |
341 | } | |
e26a5843 | 342 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
343 | |
344 | /** | |
e26a5843 | 345 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
346 | * @device_name: Name of NTB client device |
347 | * | |
348 | * Register an NTB client device with the NTB transport layer | |
349 | */ | |
e26a5843 | 350 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
351 | { |
352 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 353 | struct ntb_transport_ctx *nt; |
1199aa61 | 354 | int node; |
8b19d450 | 355 | int rc, i = 0; |
fce8a7bb | 356 | |
8222b402 JM |
357 | if (list_empty(&ntb_transport_list)) |
358 | return -ENODEV; | |
359 | ||
fce8a7bb JM |
360 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
361 | struct device *dev; | |
362 | ||
1199aa61 AH |
363 | node = dev_to_node(&nt->ndev->dev); |
364 | ||
365 | client_dev = kzalloc_node(sizeof(*client_dev), | |
366 | GFP_KERNEL, node); | |
fce8a7bb JM |
367 | if (!client_dev) { |
368 | rc = -ENOMEM; | |
369 | goto err; | |
370 | } | |
371 | ||
372 | dev = &client_dev->dev; | |
373 | ||
374 | /* setup and register client devices */ | |
8b19d450 | 375 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
376 | dev->bus = &ntb_transport_bus; |
377 | dev->release = ntb_transport_client_release; | |
378 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
379 | |
380 | rc = device_register(dev); | |
381 | if (rc) { | |
382 | kfree(client_dev); | |
383 | goto err; | |
384 | } | |
385 | ||
386 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 387 | i++; |
fce8a7bb JM |
388 | } |
389 | ||
390 | return 0; | |
391 | ||
392 | err: | |
e26a5843 | 393 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
394 | |
395 | return rc; | |
396 | } | |
e26a5843 | 397 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
398 | |
399 | /** | |
ec110bc7 | 400 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
401 | * @drv: NTB client driver to be registered |
402 | * | |
403 | * Register an NTB client driver with the NTB transport layer | |
404 | * | |
405 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
406 | */ | |
e26a5843 | 407 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 408 | { |
e26a5843 | 409 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 410 | |
8222b402 JM |
411 | if (list_empty(&ntb_transport_list)) |
412 | return -ENODEV; | |
413 | ||
fce8a7bb JM |
414 | return driver_register(&drv->driver); |
415 | } | |
ec110bc7 | 416 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
417 | |
418 | /** | |
ec110bc7 | 419 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
420 | * @drv: NTB client driver to be unregistered |
421 | * | |
422 | * Unregister an NTB client driver with the NTB transport layer | |
423 | * | |
424 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
425 | */ | |
e26a5843 | 426 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
427 | { |
428 | driver_unregister(&drv->driver); | |
429 | } | |
ec110bc7 | 430 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 431 | |
fce8a7bb JM |
432 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
433 | loff_t *offp) | |
434 | { | |
435 | struct ntb_transport_qp *qp; | |
d7237e22 | 436 | char *buf; |
fce8a7bb JM |
437 | ssize_t ret, out_offset, out_count; |
438 | ||
282a2fee | 439 | out_count = 1000; |
d7237e22 JM |
440 | |
441 | buf = kmalloc(out_count, GFP_KERNEL); | |
442 | if (!buf) | |
443 | return -ENOMEM; | |
fce8a7bb JM |
444 | |
445 | qp = filp->private_data; | |
446 | out_offset = 0; | |
447 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
448 | "NTB QP stats\n"); | |
449 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
450 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
451 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
452 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
453 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
454 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
455 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
456 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
457 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
458 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
459 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
460 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
461 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
462 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
463 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
464 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
465 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 466 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 467 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 468 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 469 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 470 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
471 | |
472 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
473 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
474 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
475 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
476 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
477 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
478 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
479 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
480 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
481 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
482 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
483 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 484 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 485 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 486 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 487 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 488 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 489 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
490 | |
491 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
e26a5843 AH |
492 | "\nQP Link %s\n", |
493 | qp->link_is_up ? "Up" : "Down"); | |
d7237e22 JM |
494 | if (out_offset > out_count) |
495 | out_offset = out_count; | |
fce8a7bb JM |
496 | |
497 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 498 | kfree(buf); |
fce8a7bb JM |
499 | return ret; |
500 | } | |
501 | ||
502 | static const struct file_operations ntb_qp_debugfs_stats = { | |
503 | .owner = THIS_MODULE, | |
d66d7ac2 | 504 | .open = simple_open, |
fce8a7bb JM |
505 | .read = debugfs_read, |
506 | }; | |
507 | ||
508 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
509 | struct list_head *list) | |
510 | { | |
511 | unsigned long flags; | |
512 | ||
513 | spin_lock_irqsave(lock, flags); | |
514 | list_add_tail(entry, list); | |
515 | spin_unlock_irqrestore(lock, flags); | |
516 | } | |
517 | ||
518 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 519 | struct list_head *list) |
fce8a7bb JM |
520 | { |
521 | struct ntb_queue_entry *entry; | |
522 | unsigned long flags; | |
523 | ||
524 | spin_lock_irqsave(lock, flags); | |
525 | if (list_empty(list)) { | |
526 | entry = NULL; | |
527 | goto out; | |
528 | } | |
529 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
530 | list_del(&entry->entry); | |
531 | out: | |
532 | spin_unlock_irqrestore(lock, flags); | |
533 | ||
534 | return entry; | |
535 | } | |
536 | ||
e26a5843 AH |
537 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
538 | unsigned int qp_num) | |
fce8a7bb | 539 | { |
e26a5843 AH |
540 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
541 | struct ntb_transport_mw *mw; | |
ef114ed5 | 542 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 543 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 544 | unsigned int i; |
fce8a7bb | 545 | |
e26a5843 AH |
546 | mw_count = nt->mw_count; |
547 | qp_count = nt->qp_count; | |
948d3a65 | 548 | |
e26a5843 AH |
549 | mw_num = QP_TO_MW(nt, qp_num); |
550 | mw = &nt->mw_vec[mw_num]; | |
551 | ||
552 | if (!mw->virt_addr) | |
553 | return -ENOMEM; | |
fce8a7bb | 554 | |
e26a5843 AH |
555 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
556 | num_qps_mw = qp_count / mw_count + 1; | |
fce8a7bb | 557 | else |
e26a5843 | 558 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 559 | |
e26a5843 AH |
560 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
561 | qp->rx_buff = mw->virt_addr + rx_size * qp_num / mw_count; | |
793c20e9 JM |
562 | rx_size -= sizeof(struct ntb_rx_info); |
563 | ||
282a2fee JM |
564 | qp->remote_rx_info = qp->rx_buff + rx_size; |
565 | ||
c9d534c8 JM |
566 | /* Due to housekeeping, there must be atleast 2 buffs */ |
567 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
568 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
569 | qp->rx_index = 0; | |
570 | ||
c9d534c8 | 571 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 572 | |
ef114ed5 | 573 | /* setup the hdr offsets with 0's */ |
793c20e9 | 574 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
575 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
576 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 577 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 578 | } |
fce8a7bb JM |
579 | |
580 | qp->rx_pkts = 0; | |
581 | qp->tx_pkts = 0; | |
90f9e934 | 582 | qp->tx_index = 0; |
e26a5843 AH |
583 | |
584 | return 0; | |
fce8a7bb JM |
585 | } |
586 | ||
e26a5843 | 587 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 588 | { |
e26a5843 AH |
589 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
590 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
591 | |
592 | if (!mw->virt_addr) | |
593 | return; | |
594 | ||
e26a5843 AH |
595 | ntb_mw_clear_trans(nt->ndev, num_mw); |
596 | dma_free_coherent(&pdev->dev, mw->buff_size, | |
597 | mw->virt_addr, mw->dma_addr); | |
598 | mw->xlat_size = 0; | |
599 | mw->buff_size = 0; | |
b77b2637 JM |
600 | mw->virt_addr = NULL; |
601 | } | |
602 | ||
e26a5843 AH |
603 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
604 | unsigned int size) | |
fce8a7bb | 605 | { |
e26a5843 AH |
606 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
607 | struct pci_dev *pdev = nt->ndev->pdev; | |
608 | unsigned int xlat_size, buff_size; | |
609 | int rc; | |
610 | ||
611 | xlat_size = round_up(size, mw->xlat_align_size); | |
612 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 613 | |
b77b2637 | 614 | /* No need to re-setup */ |
e26a5843 | 615 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
616 | return 0; |
617 | ||
e26a5843 | 618 | if (mw->buff_size) |
b77b2637 JM |
619 | ntb_free_mw(nt, num_mw); |
620 | ||
e26a5843 AH |
621 | /* Alloc memory for receiving data. Must be aligned */ |
622 | mw->xlat_size = xlat_size; | |
623 | mw->buff_size = buff_size; | |
fce8a7bb | 624 | |
e26a5843 AH |
625 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
626 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 627 | if (!mw->virt_addr) { |
e26a5843 AH |
628 | mw->xlat_size = 0; |
629 | mw->buff_size = 0; | |
630 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %d\n", | |
631 | buff_size); | |
fce8a7bb JM |
632 | return -ENOMEM; |
633 | } | |
634 | ||
3cc5ba19 DJ |
635 | /* |
636 | * we must ensure that the memory address allocated is BAR size | |
637 | * aligned in order for the XLAT register to take the value. This | |
638 | * is a requirement of the hardware. It is recommended to setup CMA | |
639 | * for BAR sizes equal or greater than 4MB. | |
640 | */ | |
e26a5843 AH |
641 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
642 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
643 | &mw->dma_addr); |
644 | ntb_free_mw(nt, num_mw); | |
645 | return -ENOMEM; | |
646 | } | |
647 | ||
fce8a7bb | 648 | /* Notify HW the memory location of the receive buffer */ |
e26a5843 AH |
649 | rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
650 | if (rc) { | |
651 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
652 | ntb_free_mw(nt, num_mw); | |
653 | return -EIO; | |
654 | } | |
fce8a7bb JM |
655 | |
656 | return 0; | |
657 | } | |
658 | ||
2849b5d7 AH |
659 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
660 | { | |
661 | qp->link_is_up = false; | |
662 | ||
663 | qp->tx_index = 0; | |
664 | qp->rx_index = 0; | |
665 | qp->rx_bytes = 0; | |
666 | qp->rx_pkts = 0; | |
667 | qp->rx_ring_empty = 0; | |
668 | qp->rx_err_no_buf = 0; | |
669 | qp->rx_err_oflow = 0; | |
670 | qp->rx_err_ver = 0; | |
671 | qp->rx_memcpy = 0; | |
672 | qp->rx_async = 0; | |
673 | qp->tx_bytes = 0; | |
674 | qp->tx_pkts = 0; | |
675 | qp->tx_ring_full = 0; | |
676 | qp->tx_err_no_buf = 0; | |
677 | qp->tx_memcpy = 0; | |
678 | qp->tx_async = 0; | |
679 | } | |
680 | ||
fca4d518 | 681 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 682 | { |
e26a5843 AH |
683 | struct ntb_transport_ctx *nt = qp->transport; |
684 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 685 | |
e22e0b9d | 686 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
687 | |
688 | cancel_delayed_work_sync(&qp->link_work); | |
689 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
690 | |
691 | if (qp->event_handler) | |
692 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
693 | } |
694 | ||
695 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
696 | { | |
697 | struct ntb_transport_qp *qp = container_of(work, | |
698 | struct ntb_transport_qp, | |
699 | link_cleanup); | |
e26a5843 | 700 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
701 | |
702 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 703 | |
e26a5843 | 704 | if (nt->link_is_up) |
fce8a7bb JM |
705 | schedule_delayed_work(&qp->link_work, |
706 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
707 | } | |
708 | ||
7b4f2d3c JM |
709 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
710 | { | |
711 | schedule_work(&qp->link_cleanup); | |
712 | } | |
713 | ||
e26a5843 | 714 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 715 | { |
e26a5843 AH |
716 | struct ntb_transport_qp *qp; |
717 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
718 | int i; |
719 | ||
e26a5843 AH |
720 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
721 | ||
fca4d518 | 722 | /* Pass along the info to any clients */ |
e26a5843 AH |
723 | for (i = 0; i < nt->qp_count; i++) |
724 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
725 | qp = &nt->qp_vec[i]; | |
726 | ntb_qp_link_cleanup(qp); | |
727 | cancel_work_sync(&qp->link_cleanup); | |
728 | cancel_delayed_work_sync(&qp->link_work); | |
729 | } | |
fca4d518 | 730 | |
e26a5843 | 731 | if (!nt->link_is_up) |
fce8a7bb | 732 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 733 | |
fce8a7bb JM |
734 | /* The scratchpad registers keep the values if the remote side |
735 | * goes down, blast them now to give them a sane value the next | |
736 | * time they are accessed | |
737 | */ | |
738 | for (i = 0; i < MAX_SPAD; i++) | |
e26a5843 | 739 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
740 | } |
741 | ||
fca4d518 JM |
742 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
743 | { | |
e26a5843 AH |
744 | struct ntb_transport_ctx *nt = |
745 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
746 | |
747 | ntb_transport_link_cleanup(nt); | |
748 | } | |
749 | ||
e26a5843 | 750 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 751 | { |
e26a5843 | 752 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 753 | |
e26a5843 | 754 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 755 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 756 | else |
7b4f2d3c | 757 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
758 | } |
759 | ||
760 | static void ntb_transport_link_work(struct work_struct *work) | |
761 | { | |
e26a5843 AH |
762 | struct ntb_transport_ctx *nt = |
763 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
764 | struct ntb_dev *ndev = nt->ndev; | |
765 | struct pci_dev *pdev = ndev->pdev; | |
766 | resource_size_t size; | |
fce8a7bb | 767 | u32 val; |
e26a5843 | 768 | int rc, i, spad; |
fce8a7bb | 769 | |
113fc505 | 770 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
771 | for (i = 0; i < nt->mw_count; i++) { |
772 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 773 | |
e26a5843 AH |
774 | if (max_mw_size && size > max_mw_size) |
775 | size = max_mw_size; | |
fce8a7bb | 776 | |
e26a5843 AH |
777 | spad = MW0_SZ_HIGH + (i * 2); |
778 | ntb_peer_spad_write(ndev, spad, (u32)(size >> 32)); | |
fce8a7bb | 779 | |
e26a5843 AH |
780 | spad = MW0_SZ_LOW + (i * 2); |
781 | ntb_peer_spad_write(ndev, spad, (u32)size); | |
fce8a7bb JM |
782 | } |
783 | ||
e26a5843 | 784 | ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
fce8a7bb | 785 | |
e26a5843 | 786 | ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
fce8a7bb | 787 | |
e26a5843 | 788 | ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 789 | |
e26a5843 | 790 | /* Query the remote side for its info */ |
0f69a7df | 791 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
792 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
793 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 794 | goto out; |
fce8a7bb | 795 | |
0f69a7df | 796 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 797 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 798 | if (val != nt->qp_count) |
fce8a7bb | 799 | goto out; |
fce8a7bb | 800 | |
0f69a7df | 801 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 802 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
803 | if (val != nt->mw_count) |
804 | goto out; | |
fce8a7bb | 805 | |
e26a5843 | 806 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 807 | u64 val64; |
fce8a7bb | 808 | |
0f69a7df | 809 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 810 | val64 = (u64)val << 32; |
113fc505 | 811 | |
0f69a7df | 812 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
813 | val64 |= val; |
814 | ||
e26a5843 | 815 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
816 | |
817 | rc = ntb_set_mw(nt, i, val64); | |
818 | if (rc) | |
819 | goto out1; | |
820 | } | |
fce8a7bb | 821 | |
e26a5843 | 822 | nt->link_is_up = true; |
fce8a7bb | 823 | |
e26a5843 AH |
824 | for (i = 0; i < nt->qp_count; i++) { |
825 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
826 | |
827 | ntb_transport_setup_qp_mw(nt, i); | |
828 | ||
e26a5843 | 829 | if (qp->client_ready) |
fce8a7bb JM |
830 | schedule_delayed_work(&qp->link_work, 0); |
831 | } | |
832 | ||
833 | return; | |
834 | ||
113fc505 | 835 | out1: |
e26a5843 | 836 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 837 | ntb_free_mw(nt, i); |
fce8a7bb | 838 | out: |
e26a5843 | 839 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
840 | schedule_delayed_work(&nt->link_work, |
841 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
842 | } | |
843 | ||
844 | static void ntb_qp_link_work(struct work_struct *work) | |
845 | { | |
846 | struct ntb_transport_qp *qp = container_of(work, | |
847 | struct ntb_transport_qp, | |
848 | link_work.work); | |
e26a5843 AH |
849 | struct pci_dev *pdev = qp->ndev->pdev; |
850 | struct ntb_transport_ctx *nt = qp->transport; | |
851 | int val; | |
fce8a7bb | 852 | |
e26a5843 | 853 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 854 | |
e26a5843 | 855 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 856 | |
e26a5843 | 857 | ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
858 | |
859 | /* query remote spad for qp ready bits */ | |
e26a5843 | 860 | ntb_peer_spad_read(nt->ndev, QP_LINKS); |
28762289 | 861 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
862 | |
863 | /* See if the remote side is up */ | |
e26a5843 | 864 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 865 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 AH |
866 | qp->link_is_up = true; |
867 | ||
fce8a7bb | 868 | if (qp->event_handler) |
e26a5843 AH |
869 | qp->event_handler(qp->cb_data, qp->link_is_up); |
870 | } else if (nt->link_is_up) | |
fce8a7bb JM |
871 | schedule_delayed_work(&qp->link_work, |
872 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
873 | } | |
874 | ||
e26a5843 | 875 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 876 | unsigned int qp_num) |
fce8a7bb JM |
877 | { |
878 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
879 | struct ntb_transport_mw *mw; |
880 | phys_addr_t mw_base; | |
881 | resource_size_t mw_size; | |
ef114ed5 | 882 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 883 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 884 | u64 qp_offset; |
948d3a65 | 885 | |
e26a5843 AH |
886 | mw_count = nt->mw_count; |
887 | qp_count = nt->qp_count; | |
fce8a7bb | 888 | |
e26a5843 AH |
889 | mw_num = QP_TO_MW(nt, qp_num); |
890 | mw = &nt->mw_vec[mw_num]; | |
891 | ||
892 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
893 | qp->qp_num = qp_num; |
894 | qp->transport = nt; | |
895 | qp->ndev = nt->ndev; | |
e26a5843 | 896 | qp->client_ready = false; |
fce8a7bb | 897 | qp->event_handler = NULL; |
2849b5d7 | 898 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 899 | |
e26a5843 AH |
900 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
901 | num_qps_mw = qp_count / mw_count + 1; | |
ef114ed5 | 902 | else |
e26a5843 AH |
903 | num_qps_mw = qp_count / mw_count; |
904 | ||
905 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
906 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 907 | |
e26a5843 AH |
908 | tx_size = (unsigned int)mw_size / num_qps_mw; |
909 | qp_offset = tx_size * qp_num / mw_count; | |
910 | ||
911 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
912 | if (!qp->tx_mw) |
913 | return -EINVAL; | |
914 | ||
e26a5843 | 915 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
916 | if (!qp->tx_mw_phys) |
917 | return -EINVAL; | |
918 | ||
793c20e9 | 919 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 920 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 921 | |
c9d534c8 JM |
922 | /* Due to housekeeping, there must be atleast 2 buffs */ |
923 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 924 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 925 | |
e26a5843 | 926 | if (nt_debugfs_dir) { |
fce8a7bb JM |
927 | char debugfs_name[4]; |
928 | ||
929 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
930 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
e26a5843 | 931 | nt_debugfs_dir); |
fce8a7bb JM |
932 | |
933 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
934 | qp->debugfs_dir, qp, | |
935 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
936 | } else { |
937 | qp->debugfs_dir = NULL; | |
938 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
939 | } |
940 | ||
941 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 942 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb JM |
943 | |
944 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
945 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
946 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
947 | ||
948 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
949 | INIT_LIST_HEAD(&qp->rx_free_q); | |
950 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 951 | |
e26a5843 AH |
952 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
953 | (unsigned long)qp); | |
954 | ||
282a2fee | 955 | return 0; |
fce8a7bb JM |
956 | } |
957 | ||
e26a5843 | 958 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 959 | { |
e26a5843 AH |
960 | struct ntb_transport_ctx *nt; |
961 | struct ntb_transport_mw *mw; | |
962 | unsigned int mw_count, qp_count; | |
963 | u64 qp_bitmap; | |
1199aa61 | 964 | int node; |
fce8a7bb JM |
965 | int rc, i; |
966 | ||
e26a5843 AH |
967 | if (ntb_db_is_unsafe(ndev)) |
968 | dev_dbg(&ndev->dev, | |
969 | "doorbell is unsafe, proceed anyway...\n"); | |
970 | if (ntb_spad_is_unsafe(ndev)) | |
971 | dev_dbg(&ndev->dev, | |
972 | "scratchpad is unsafe, proceed anyway...\n"); | |
973 | ||
1199aa61 AH |
974 | node = dev_to_node(&ndev->dev); |
975 | ||
976 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
977 | if (!nt) |
978 | return -ENOMEM; | |
979 | ||
e26a5843 AH |
980 | nt->ndev = ndev; |
981 | ||
982 | mw_count = ntb_mw_count(ndev); | |
983 | ||
984 | nt->mw_count = mw_count; | |
985 | ||
1199aa61 AH |
986 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
987 | GFP_KERNEL, node); | |
e26a5843 AH |
988 | if (!nt->mw_vec) { |
989 | rc = -ENOMEM; | |
fce8a7bb JM |
990 | goto err; |
991 | } | |
992 | ||
e26a5843 AH |
993 | for (i = 0; i < mw_count; i++) { |
994 | mw = &nt->mw_vec[i]; | |
995 | ||
996 | rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, | |
997 | &mw->xlat_align, &mw->xlat_align_size); | |
998 | if (rc) | |
999 | goto err1; | |
1000 | ||
06917f75 | 1001 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
1002 | if (!mw->vbase) { |
1003 | rc = -ENOMEM; | |
1004 | goto err1; | |
1005 | } | |
1006 | ||
1007 | mw->buff_size = 0; | |
1008 | mw->xlat_size = 0; | |
1009 | mw->virt_addr = NULL; | |
1010 | mw->dma_addr = 0; | |
948d3a65 JM |
1011 | } |
1012 | ||
e26a5843 AH |
1013 | qp_bitmap = ntb_db_valid_mask(ndev); |
1014 | ||
1015 | qp_count = ilog2(qp_bitmap); | |
1016 | if (max_num_clients && max_num_clients < qp_count) | |
1017 | qp_count = max_num_clients; | |
1018 | else if (mw_count < qp_count) | |
1019 | qp_count = mw_count; | |
1020 | ||
1021 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1022 | ||
1023 | nt->qp_count = qp_count; | |
1024 | nt->qp_bitmap = qp_bitmap; | |
1025 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1026 | |
1199aa61 AH |
1027 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1028 | GFP_KERNEL, node); | |
e26a5843 | 1029 | if (!nt->qp_vec) { |
fce8a7bb | 1030 | rc = -ENOMEM; |
948d3a65 | 1031 | goto err2; |
fce8a7bb JM |
1032 | } |
1033 | ||
e26a5843 | 1034 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1035 | rc = ntb_transport_init_queue(nt, i); |
1036 | if (rc) | |
1037 | goto err3; | |
1038 | } | |
fce8a7bb JM |
1039 | |
1040 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1041 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1042 | |
e26a5843 | 1043 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1044 | if (rc) |
948d3a65 | 1045 | goto err3; |
fce8a7bb JM |
1046 | |
1047 | INIT_LIST_HEAD(&nt->client_devs); | |
1048 | rc = ntb_bus_init(nt); | |
1049 | if (rc) | |
948d3a65 | 1050 | goto err4; |
fce8a7bb | 1051 | |
e26a5843 AH |
1052 | nt->link_is_up = false; |
1053 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1054 | ntb_link_event(ndev); | |
fce8a7bb JM |
1055 | |
1056 | return 0; | |
1057 | ||
948d3a65 | 1058 | err4: |
e26a5843 | 1059 | ntb_clear_ctx(ndev); |
948d3a65 | 1060 | err3: |
e26a5843 | 1061 | kfree(nt->qp_vec); |
948d3a65 | 1062 | err2: |
e26a5843 | 1063 | kfree(nt->mw_vec); |
fce8a7bb | 1064 | err1: |
e26a5843 AH |
1065 | while (i--) { |
1066 | mw = &nt->mw_vec[i]; | |
1067 | iounmap(mw->vbase); | |
1068 | } | |
fce8a7bb | 1069 | err: |
fce8a7bb JM |
1070 | kfree(nt); |
1071 | return rc; | |
1072 | } | |
1073 | ||
e26a5843 | 1074 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1075 | { |
e26a5843 AH |
1076 | struct ntb_transport_ctx *nt = ndev->ctx; |
1077 | struct ntb_transport_qp *qp; | |
1078 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1079 | int i; |
1080 | ||
fca4d518 | 1081 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1082 | cancel_work_sync(&nt->link_cleanup); |
1083 | cancel_delayed_work_sync(&nt->link_work); | |
1084 | ||
1085 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1086 | |
1087 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1088 | for (i = 0; i < nt->qp_count; i++) { |
1089 | qp = &nt->qp_vec[i]; | |
1090 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1091 | ntb_transport_free_queue(qp); | |
1092 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1093 | } |
fce8a7bb | 1094 | |
e26a5843 AH |
1095 | ntb_link_disable(ndev); |
1096 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1097 | |
e26a5843 | 1098 | ntb_bus_remove(nt); |
fce8a7bb | 1099 | |
e26a5843 | 1100 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1101 | ntb_free_mw(nt, i); |
e26a5843 AH |
1102 | iounmap(nt->mw_vec[i].vbase); |
1103 | } | |
fce8a7bb | 1104 | |
e26a5843 AH |
1105 | kfree(nt->qp_vec); |
1106 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1107 | kfree(nt); |
1108 | } | |
1109 | ||
282a2fee | 1110 | static void ntb_rx_copy_callback(void *data) |
fce8a7bb | 1111 | { |
282a2fee JM |
1112 | struct ntb_queue_entry *entry = data; |
1113 | struct ntb_transport_qp *qp = entry->qp; | |
448c6fb3 JM |
1114 | void *cb_data = entry->cb_data; |
1115 | unsigned int len = entry->len; | |
282a2fee JM |
1116 | struct ntb_payload_header *hdr = entry->rx_hdr; |
1117 | ||
282a2fee | 1118 | hdr->flags = 0; |
fce8a7bb | 1119 | |
282a2fee | 1120 | iowrite32(entry->index, &qp->rx_info->entry); |
fce8a7bb JM |
1121 | |
1122 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 | 1123 | |
e26a5843 | 1124 | if (qp->rx_handler && qp->client_ready) |
448c6fb3 | 1125 | qp->rx_handler(qp, qp->cb_data, cb_data, len); |
fce8a7bb JM |
1126 | } |
1127 | ||
282a2fee JM |
1128 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1129 | { | |
1130 | void *buf = entry->buf; | |
1131 | size_t len = entry->len; | |
1132 | ||
1133 | memcpy(buf, offset, len); | |
1134 | ||
e26a5843 AH |
1135 | /* Ensure that the data is fully copied out before clearing the flag */ |
1136 | wmb(); | |
1137 | ||
282a2fee JM |
1138 | ntb_rx_copy_callback(entry); |
1139 | } | |
1140 | ||
1141 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset, | |
1142 | size_t len) | |
1143 | { | |
1144 | struct dma_async_tx_descriptor *txd; | |
1145 | struct ntb_transport_qp *qp = entry->qp; | |
1146 | struct dma_chan *chan = qp->dma_chan; | |
1147 | struct dma_device *device; | |
1148 | size_t pay_off, buff_off; | |
6f57fd05 | 1149 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1150 | dma_cookie_t cookie; |
1151 | void *buf = entry->buf; | |
282a2fee JM |
1152 | |
1153 | entry->len = len; | |
1154 | ||
1155 | if (!chan) | |
1156 | goto err; | |
1157 | ||
53ca4fea | 1158 | if (len < copy_bytes) |
6f57fd05 | 1159 | goto err_wait; |
282a2fee JM |
1160 | |
1161 | device = chan->device; | |
e26a5843 AH |
1162 | pay_off = (size_t)offset & ~PAGE_MASK; |
1163 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1164 | |
1165 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
6f57fd05 | 1166 | goto err_wait; |
282a2fee | 1167 | |
6f57fd05 BZ |
1168 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1169 | if (!unmap) | |
1170 | goto err_wait; | |
282a2fee | 1171 | |
6f57fd05 BZ |
1172 | unmap->len = len; |
1173 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1174 | pay_off, len, DMA_TO_DEVICE); | |
1175 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1176 | goto err_get_unmap; | |
1177 | ||
1178 | unmap->to_cnt = 1; | |
282a2fee | 1179 | |
6f57fd05 BZ |
1180 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1181 | buff_off, len, DMA_FROM_DEVICE); | |
1182 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1183 | goto err_get_unmap; | |
1184 | ||
1185 | unmap->from_cnt = 1; | |
1186 | ||
6f57fd05 | 1187 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
0776ae7b BZ |
1188 | unmap->addr[0], len, |
1189 | DMA_PREP_INTERRUPT); | |
282a2fee | 1190 | if (!txd) |
6f57fd05 | 1191 | goto err_get_unmap; |
282a2fee JM |
1192 | |
1193 | txd->callback = ntb_rx_copy_callback; | |
1194 | txd->callback_param = entry; | |
6f57fd05 | 1195 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1196 | |
1197 | cookie = dmaengine_submit(txd); | |
1198 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1199 | goto err_set_unmap; |
1200 | ||
1201 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1202 | |
1203 | qp->last_cookie = cookie; | |
1204 | ||
1205 | qp->rx_async++; | |
1206 | ||
1207 | return; | |
1208 | ||
6f57fd05 BZ |
1209 | err_set_unmap: |
1210 | dmaengine_unmap_put(unmap); | |
1211 | err_get_unmap: | |
1212 | dmaengine_unmap_put(unmap); | |
1213 | err_wait: | |
282a2fee JM |
1214 | /* If the callbacks come out of order, the writing of the index to the |
1215 | * last completed will be out of order. This may result in the | |
1216 | * receive stalling forever. | |
1217 | */ | |
1218 | dma_sync_wait(chan, qp->last_cookie); | |
1219 | err: | |
1220 | ntb_memcpy_rx(entry, offset); | |
1221 | qp->rx_memcpy++; | |
1222 | } | |
1223 | ||
fce8a7bb JM |
1224 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1225 | { | |
1226 | struct ntb_payload_header *hdr; | |
1227 | struct ntb_queue_entry *entry; | |
1228 | void *offset; | |
e26a5843 | 1229 | int rc; |
fce8a7bb | 1230 | |
793c20e9 JM |
1231 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1232 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1233 | ||
e26a5843 AH |
1234 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1235 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1236 | |
fce8a7bb | 1237 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1238 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1239 | qp->rx_ring_empty++; |
1240 | return -EAGAIN; | |
1241 | } | |
1242 | ||
e26a5843 AH |
1243 | if (hdr->flags & LINK_DOWN_FLAG) { |
1244 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1245 | ntb_qp_link_down(qp); | |
1246 | hdr->flags = 0; | |
c0900b33 | 1247 | return -EAGAIN; |
e26a5843 AH |
1248 | } |
1249 | ||
1250 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1251 | dev_dbg(&qp->ndev->pdev->dev, | |
1252 | "version mismatch, expected %llu - got %u\n", | |
1253 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1254 | qp->rx_err_ver++; |
1255 | return -EIO; | |
1256 | } | |
1257 | ||
e26a5843 AH |
1258 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
1259 | if (!entry) { | |
1260 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1261 | qp->rx_err_no_buf++; | |
fce8a7bb | 1262 | |
e26a5843 | 1263 | rc = -ENOMEM; |
282a2fee | 1264 | goto err; |
fce8a7bb JM |
1265 | } |
1266 | ||
282a2fee | 1267 | if (hdr->len > entry->len) { |
e26a5843 AH |
1268 | dev_dbg(&qp->ndev->pdev->dev, |
1269 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1270 | hdr->len, entry->len); |
e26a5843 | 1271 | qp->rx_err_oflow++; |
282a2fee | 1272 | |
e26a5843 | 1273 | rc = -EIO; |
282a2fee | 1274 | goto err; |
fce8a7bb JM |
1275 | } |
1276 | ||
e26a5843 AH |
1277 | dev_dbg(&qp->ndev->pdev->dev, |
1278 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1279 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
1280 | ||
1281 | qp->rx_bytes += hdr->len; | |
1282 | qp->rx_pkts++; | |
1283 | ||
282a2fee JM |
1284 | entry->index = qp->rx_index; |
1285 | entry->rx_hdr = hdr; | |
1286 | ||
1287 | ntb_async_rx(entry, offset, hdr->len); | |
fce8a7bb | 1288 | |
282a2fee JM |
1289 | qp->rx_index++; |
1290 | qp->rx_index %= qp->rx_max_entry; | |
1291 | ||
1292 | return 0; | |
1293 | ||
1294 | err: | |
e26a5843 AH |
1295 | /* FIXME: if this syncrhonous update of the rx_index gets ahead of |
1296 | * asyncrhonous ntb_rx_copy_callback of previous entry, there are three | |
1297 | * scenarios: | |
1298 | * | |
1299 | * 1) The peer might miss this update, but observe the update | |
1300 | * from the memcpy completion callback. In this case, the buffer will | |
1301 | * not be freed on the peer to be reused for a different packet. The | |
1302 | * successful rx of a later packet would clear the condition, but the | |
1303 | * condition could persist if several rx fail in a row. | |
1304 | * | |
1305 | * 2) The peer may observe this update before the asyncrhonous copy of | |
1306 | * prior packets is completed. The peer may overwrite the buffers of | |
1307 | * the prior packets before they are copied. | |
1308 | * | |
1309 | * 3) Both: the peer may observe the update, and then observe the index | |
1310 | * decrement by the asynchronous completion callback. Who knows what | |
1311 | * badness that will cause. | |
1312 | */ | |
793c20e9 | 1313 | hdr->flags = 0; |
74465645 | 1314 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 | 1315 | |
e26a5843 | 1316 | return rc; |
fce8a7bb JM |
1317 | } |
1318 | ||
e26a5843 | 1319 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1320 | { |
e26a5843 | 1321 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1322 | int rc, i; |
fce8a7bb | 1323 | |
e26a5843 AH |
1324 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1325 | __func__, qp->qp_num); | |
e8aeb60c | 1326 | |
c336acd3 JM |
1327 | /* Limit the number of packets processed in a single interrupt to |
1328 | * provide fairness to others | |
1329 | */ | |
1330 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1331 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1332 | if (rc) |
1333 | break; | |
1334 | } | |
282a2fee JM |
1335 | |
1336 | if (qp->dma_chan) | |
1337 | dma_async_issue_pending(qp->dma_chan); | |
fce8a7bb | 1338 | |
e26a5843 AH |
1339 | if (i == qp->rx_max_entry) { |
1340 | /* there is more work to do */ | |
1341 | tasklet_schedule(&qp->rxc_db_work); | |
1342 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { | |
1343 | /* the doorbell bit is set: clear it */ | |
1344 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1345 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1346 | ntb_db_read(qp->ndev); | |
1347 | ||
1348 | /* an interrupt may have arrived between finishing | |
1349 | * ntb_process_rxc and clearing the doorbell bit: | |
1350 | * there might be some more work to do. | |
1351 | */ | |
1352 | tasklet_schedule(&qp->rxc_db_work); | |
1353 | } | |
fce8a7bb JM |
1354 | } |
1355 | ||
282a2fee | 1356 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1357 | { |
282a2fee JM |
1358 | struct ntb_queue_entry *entry = data; |
1359 | struct ntb_transport_qp *qp = entry->qp; | |
1360 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1361 | |
74465645 | 1362 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1363 | |
e26a5843 | 1364 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1365 | |
1366 | /* The entry length can only be zero if the packet is intended to be a | |
1367 | * "link down" or similar. Since no payload is being sent in these | |
1368 | * cases, there is nothing to add to the completion queue. | |
1369 | */ | |
1370 | if (entry->len > 0) { | |
1371 | qp->tx_bytes += entry->len; | |
1372 | ||
1373 | if (qp->tx_handler) | |
1374 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1375 | entry->len); | |
1376 | } | |
1377 | ||
1378 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1379 | } | |
1380 | ||
282a2fee | 1381 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1382 | { |
06917f75 DJ |
1383 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1384 | /* | |
1385 | * Using non-temporal mov to improve performance on non-cached | |
1386 | * writes, even though we aren't actually copying from user space. | |
1387 | */ | |
1388 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1389 | #else | |
282a2fee | 1390 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1391 | #endif |
282a2fee | 1392 | |
e26a5843 AH |
1393 | /* Ensure that the data is fully copied out before setting the flags */ |
1394 | wmb(); | |
1395 | ||
282a2fee JM |
1396 | ntb_tx_copy_callback(entry); |
1397 | } | |
1398 | ||
1399 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1400 | struct ntb_queue_entry *entry) | |
1401 | { | |
1402 | struct ntb_payload_header __iomem *hdr; | |
1403 | struct dma_async_tx_descriptor *txd; | |
1404 | struct dma_chan *chan = qp->dma_chan; | |
1405 | struct dma_device *device; | |
1406 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1407 | struct dmaengine_unmap_data *unmap; |
1408 | dma_addr_t dest; | |
282a2fee | 1409 | dma_cookie_t cookie; |
74465645 | 1410 | void __iomem *offset; |
282a2fee JM |
1411 | size_t len = entry->len; |
1412 | void *buf = entry->buf; | |
fce8a7bb | 1413 | |
793c20e9 | 1414 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1415 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1416 | entry->tx_hdr = hdr; | |
fce8a7bb | 1417 | |
282a2fee | 1418 | iowrite32(entry->len, &hdr->len); |
e26a5843 | 1419 | iowrite32((u32)qp->tx_pkts, &hdr->ver); |
282a2fee JM |
1420 | |
1421 | if (!chan) | |
1422 | goto err; | |
1423 | ||
1424 | if (len < copy_bytes) | |
1425 | goto err; | |
1426 | ||
1427 | device = chan->device; | |
1428 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
e26a5843 AH |
1429 | buff_off = (size_t)buf & ~PAGE_MASK; |
1430 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1431 | |
1432 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1433 | goto err; | |
1434 | ||
6f57fd05 BZ |
1435 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1436 | if (!unmap) | |
282a2fee JM |
1437 | goto err; |
1438 | ||
6f57fd05 BZ |
1439 | unmap->len = len; |
1440 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1441 | buff_off, len, DMA_TO_DEVICE); | |
1442 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1443 | goto err_get_unmap; | |
1444 | ||
1445 | unmap->to_cnt = 1; | |
1446 | ||
6f57fd05 | 1447 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
0776ae7b | 1448 | DMA_PREP_INTERRUPT); |
282a2fee | 1449 | if (!txd) |
6f57fd05 | 1450 | goto err_get_unmap; |
282a2fee JM |
1451 | |
1452 | txd->callback = ntb_tx_copy_callback; | |
1453 | txd->callback_param = entry; | |
6f57fd05 | 1454 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1455 | |
1456 | cookie = dmaengine_submit(txd); | |
1457 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1458 | goto err_set_unmap; |
1459 | ||
1460 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1461 | |
1462 | dma_async_issue_pending(chan); | |
1463 | qp->tx_async++; | |
1464 | ||
1465 | return; | |
6f57fd05 BZ |
1466 | err_set_unmap: |
1467 | dmaengine_unmap_put(unmap); | |
1468 | err_get_unmap: | |
1469 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1470 | err: |
1471 | ntb_memcpy_tx(entry, offset); | |
1472 | qp->tx_memcpy++; | |
1473 | } | |
1474 | ||
1475 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1476 | struct ntb_queue_entry *entry) | |
1477 | { | |
793c20e9 | 1478 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1479 | qp->tx_ring_full++; |
1480 | return -EAGAIN; | |
1481 | } | |
1482 | ||
ef114ed5 | 1483 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1484 | if (qp->tx_handler) |
1485 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1486 | ||
1487 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1488 | &qp->tx_free_q); | |
1489 | return 0; | |
1490 | } | |
1491 | ||
282a2fee | 1492 | ntb_async_tx(qp, entry); |
fce8a7bb | 1493 | |
793c20e9 JM |
1494 | qp->tx_index++; |
1495 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1496 | |
1497 | qp->tx_pkts++; | |
1498 | ||
1499 | return 0; | |
1500 | } | |
1501 | ||
1502 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1503 | { | |
e26a5843 | 1504 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1505 | struct ntb_queue_entry *entry; |
1506 | int i, rc; | |
1507 | ||
e26a5843 | 1508 | if (!qp->link_is_up) |
fce8a7bb JM |
1509 | return; |
1510 | ||
e22e0b9d | 1511 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1512 | |
1513 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1514 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1515 | if (entry) |
1516 | break; | |
1517 | msleep(100); | |
1518 | } | |
1519 | ||
1520 | if (!entry) | |
1521 | return; | |
1522 | ||
1523 | entry->cb_data = NULL; | |
1524 | entry->buf = NULL; | |
1525 | entry->len = 0; | |
1526 | entry->flags = LINK_DOWN_FLAG; | |
1527 | ||
1528 | rc = ntb_process_tx(qp, entry); | |
1529 | if (rc) | |
1530 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1531 | qp->qp_num); | |
2849b5d7 AH |
1532 | |
1533 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1534 | } |
1535 | ||
1199aa61 AH |
1536 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1537 | { | |
1538 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1539 | } | |
1540 | ||
fce8a7bb JM |
1541 | /** |
1542 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1543 | * @rx_handler: receive callback function | |
1544 | * @tx_handler: transmit callback function | |
1545 | * @event_handler: event callback function | |
1546 | * | |
1547 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1548 | * routine for both transmit and receive. The receive callback routine will be | |
1549 | * used to pass up data when the transport has received it on the queue. The | |
1550 | * transmit callback routine will be called when the transport has completed the | |
1551 | * transmission of the data on the queue and the data is ready to be freed. | |
1552 | * | |
1553 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1554 | */ | |
1555 | struct ntb_transport_qp * | |
e26a5843 | 1556 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1557 | const struct ntb_queue_handlers *handlers) |
1558 | { | |
e26a5843 AH |
1559 | struct ntb_dev *ndev; |
1560 | struct pci_dev *pdev; | |
1561 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1562 | struct ntb_queue_entry *entry; |
1563 | struct ntb_transport_qp *qp; | |
e26a5843 | 1564 | u64 qp_bit; |
fce8a7bb | 1565 | unsigned int free_queue; |
1199aa61 AH |
1566 | dma_cap_mask_t dma_mask; |
1567 | int node; | |
e26a5843 | 1568 | int i; |
fce8a7bb | 1569 | |
e26a5843 AH |
1570 | ndev = dev_ntb(client_dev->parent); |
1571 | pdev = ndev->pdev; | |
1572 | nt = ndev->ctx; | |
fce8a7bb | 1573 | |
1199aa61 AH |
1574 | node = dev_to_node(&ndev->dev); |
1575 | ||
fce8a7bb JM |
1576 | free_queue = ffs(nt->qp_bitmap); |
1577 | if (!free_queue) | |
1578 | goto err; | |
1579 | ||
1580 | /* decrement free_queue to make it zero based */ | |
1581 | free_queue--; | |
1582 | ||
e26a5843 AH |
1583 | qp = &nt->qp_vec[free_queue]; |
1584 | qp_bit = BIT_ULL(qp->qp_num); | |
1585 | ||
1586 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1587 | |
fce8a7bb JM |
1588 | qp->cb_data = data; |
1589 | qp->rx_handler = handlers->rx_handler; | |
1590 | qp->tx_handler = handlers->tx_handler; | |
1591 | qp->event_handler = handlers->event_handler; | |
1592 | ||
1199aa61 AH |
1593 | dma_cap_zero(dma_mask); |
1594 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1595 | ||
a41ef053 DJ |
1596 | if (use_dma) { |
1597 | qp->dma_chan = dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1598 | (void *)(unsigned long)node); | |
1599 | if (!qp->dma_chan) | |
1600 | dev_info(&pdev->dev, "Unable to allocate DMA channel\n"); | |
1601 | } else { | |
1602 | qp->dma_chan = NULL; | |
1603 | } | |
1604 | dev_dbg(&pdev->dev, "Using %s memcpy\n", qp->dma_chan ? "DMA" : "CPU"); | |
282a2fee | 1605 | |
fce8a7bb | 1606 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1607 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1608 | if (!entry) |
1609 | goto err1; | |
1610 | ||
282a2fee | 1611 | entry->qp = qp; |
fce8a7bb | 1612 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, |
f766755c | 1613 | &qp->rx_free_q); |
fce8a7bb JM |
1614 | } |
1615 | ||
1616 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1199aa61 | 1617 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1618 | if (!entry) |
1619 | goto err2; | |
1620 | ||
282a2fee | 1621 | entry->qp = qp; |
fce8a7bb | 1622 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1623 | &qp->tx_free_q); |
fce8a7bb JM |
1624 | } |
1625 | ||
e26a5843 AH |
1626 | ntb_db_clear(qp->ndev, qp_bit); |
1627 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1628 | |
1629 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1630 | ||
1631 | return qp; | |
1632 | ||
fce8a7bb | 1633 | err2: |
f766755c | 1634 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1635 | kfree(entry); |
1636 | err1: | |
f766755c | 1637 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1638 | kfree(entry); |
94681194 | 1639 | if (qp->dma_chan) |
1199aa61 | 1640 | dma_release_channel(qp->dma_chan); |
e26a5843 | 1641 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1642 | err: |
1643 | return NULL; | |
1644 | } | |
1645 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1646 | ||
1647 | /** | |
1648 | * ntb_transport_free_queue - Frees NTB transport queue | |
1649 | * @qp: NTB queue to be freed | |
1650 | * | |
1651 | * Frees NTB transport queue | |
1652 | */ | |
1653 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1654 | { | |
e26a5843 | 1655 | struct ntb_transport_ctx *nt = qp->transport; |
186f27ff | 1656 | struct pci_dev *pdev; |
fce8a7bb | 1657 | struct ntb_queue_entry *entry; |
e26a5843 | 1658 | u64 qp_bit; |
fce8a7bb JM |
1659 | |
1660 | if (!qp) | |
1661 | return; | |
1662 | ||
e26a5843 | 1663 | pdev = qp->ndev->pdev; |
186f27ff | 1664 | |
282a2fee JM |
1665 | if (qp->dma_chan) { |
1666 | struct dma_chan *chan = qp->dma_chan; | |
1667 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1668 | * processed by the CPU instead of the DAM engine | |
1669 | */ | |
1670 | qp->dma_chan = NULL; | |
1671 | ||
1672 | /* Try to be nice and wait for any queued DMA engine | |
1673 | * transactions to process before smashing it with a rock | |
1674 | */ | |
1675 | dma_sync_wait(chan, qp->last_cookie); | |
1676 | dmaengine_terminate_all(chan); | |
1199aa61 | 1677 | dma_release_channel(chan); |
282a2fee | 1678 | } |
fce8a7bb | 1679 | |
e26a5843 AH |
1680 | qp_bit = BIT_ULL(qp->qp_num); |
1681 | ||
1682 | ntb_db_set_mask(qp->ndev, qp_bit); | |
1683 | tasklet_disable(&qp->rxc_db_work); | |
fce8a7bb | 1684 | |
282a2fee JM |
1685 | cancel_delayed_work_sync(&qp->link_work); |
1686 | ||
e26a5843 AH |
1687 | qp->cb_data = NULL; |
1688 | qp->rx_handler = NULL; | |
1689 | qp->tx_handler = NULL; | |
1690 | qp->event_handler = NULL; | |
1691 | ||
f766755c | 1692 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1693 | kfree(entry); |
1694 | ||
f766755c | 1695 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1696 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1697 | kfree(entry); | |
1698 | } | |
1699 | ||
f766755c | 1700 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1701 | kfree(entry); |
1702 | ||
e26a5843 | 1703 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1704 | |
1705 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1706 | } | |
1707 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1708 | ||
1709 | /** | |
1710 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1711 | * @qp: NTB queue to be freed | |
1712 | * @len: pointer to variable to write enqueued buffers length | |
1713 | * | |
1714 | * Dequeues unused buffers from receive queue. Should only be used during | |
1715 | * shutdown of qp. | |
1716 | * | |
1717 | * RETURNS: NULL error value on error, or void* for success. | |
1718 | */ | |
1719 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1720 | { | |
1721 | struct ntb_queue_entry *entry; | |
1722 | void *buf; | |
1723 | ||
e26a5843 | 1724 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1725 | return NULL; |
1726 | ||
1727 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1728 | if (!entry) | |
1729 | return NULL; | |
1730 | ||
1731 | buf = entry->cb_data; | |
1732 | *len = entry->len; | |
1733 | ||
f766755c | 1734 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1735 | |
1736 | return buf; | |
1737 | } | |
1738 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1739 | ||
1740 | /** | |
1741 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1742 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1743 | * @cb: per buffer pointer for callback function to use | |
1744 | * @data: pointer to data buffer that incoming packets will be copied into | |
1745 | * @len: length of the data buffer | |
1746 | * | |
1747 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1748 | * payload can be received into. | |
1749 | * | |
1750 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1751 | */ | |
1752 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1753 | unsigned int len) | |
1754 | { | |
1755 | struct ntb_queue_entry *entry; | |
1756 | ||
1757 | if (!qp) | |
1758 | return -EINVAL; | |
1759 | ||
1760 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1761 | if (!entry) | |
1762 | return -ENOMEM; | |
1763 | ||
1764 | entry->cb_data = cb; | |
1765 | entry->buf = data; | |
1766 | entry->len = len; | |
1767 | ||
f766755c | 1768 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1769 | |
1770 | return 0; | |
1771 | } | |
1772 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1773 | ||
1774 | /** | |
1775 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1776 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1777 | * @cb: per buffer pointer for callback function to use | |
1778 | * @data: pointer to data buffer that will be sent | |
1779 | * @len: length of the data buffer | |
1780 | * | |
1781 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1782 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1783 | * serialize access to the qp. |
1784 | * | |
1785 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1786 | */ | |
1787 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1788 | unsigned int len) | |
1789 | { | |
1790 | struct ntb_queue_entry *entry; | |
1791 | int rc; | |
1792 | ||
e26a5843 | 1793 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
1794 | return -EINVAL; |
1795 | ||
1796 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1797 | if (!entry) { |
1798 | qp->tx_err_no_buf++; | |
fce8a7bb | 1799 | return -ENOMEM; |
282a2fee | 1800 | } |
fce8a7bb JM |
1801 | |
1802 | entry->cb_data = cb; | |
1803 | entry->buf = data; | |
1804 | entry->len = len; | |
1805 | entry->flags = 0; | |
1806 | ||
1807 | rc = ntb_process_tx(qp, entry); | |
1808 | if (rc) | |
1809 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1810 | &qp->tx_free_q); | |
1811 | ||
1812 | return rc; | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1815 | ||
1816 | /** | |
1817 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1818 | * @qp: NTB transport layer queue to be enabled | |
1819 | * | |
1820 | * Notify NTB transport layer of client readiness to use queue | |
1821 | */ | |
1822 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1823 | { | |
1824 | if (!qp) | |
1825 | return; | |
1826 | ||
e26a5843 | 1827 | qp->client_ready = true; |
fce8a7bb | 1828 | |
e26a5843 | 1829 | if (qp->transport->link_is_up) |
fce8a7bb JM |
1830 | schedule_delayed_work(&qp->link_work, 0); |
1831 | } | |
1832 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1833 | ||
1834 | /** | |
1835 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1836 | * @qp: NTB transport layer queue to be disabled | |
1837 | * | |
1838 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1839 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1840 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1841 | */ |
1842 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1843 | { | |
186f27ff | 1844 | struct pci_dev *pdev; |
e26a5843 | 1845 | int val; |
fce8a7bb JM |
1846 | |
1847 | if (!qp) | |
1848 | return; | |
1849 | ||
e26a5843 AH |
1850 | pdev = qp->ndev->pdev; |
1851 | qp->client_ready = false; | |
fce8a7bb | 1852 | |
e26a5843 | 1853 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 1854 | |
e26a5843 AH |
1855 | ntb_peer_spad_write(qp->ndev, QP_LINKS, |
1856 | val & ~BIT(qp->qp_num)); | |
fce8a7bb | 1857 | |
e26a5843 | 1858 | if (qp->link_is_up) |
fce8a7bb JM |
1859 | ntb_send_link_down(qp); |
1860 | else | |
1861 | cancel_delayed_work_sync(&qp->link_work); | |
1862 | } | |
1863 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1864 | ||
1865 | /** | |
1866 | * ntb_transport_link_query - Query transport link state | |
1867 | * @qp: NTB transport layer queue to be queried | |
1868 | * | |
1869 | * Query connectivity to the remote system of the NTB transport queue | |
1870 | * | |
1871 | * RETURNS: true for link up or false for link down | |
1872 | */ | |
1873 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1874 | { | |
186f27ff JM |
1875 | if (!qp) |
1876 | return false; | |
1877 | ||
e26a5843 | 1878 | return qp->link_is_up; |
fce8a7bb JM |
1879 | } |
1880 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1881 | ||
1882 | /** | |
1883 | * ntb_transport_qp_num - Query the qp number | |
1884 | * @qp: NTB transport layer queue to be queried | |
1885 | * | |
1886 | * Query qp number of the NTB transport queue | |
1887 | * | |
1888 | * RETURNS: a zero based number specifying the qp number | |
1889 | */ | |
1890 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1891 | { | |
186f27ff JM |
1892 | if (!qp) |
1893 | return 0; | |
1894 | ||
fce8a7bb JM |
1895 | return qp->qp_num; |
1896 | } | |
1897 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1898 | ||
1899 | /** | |
1900 | * ntb_transport_max_size - Query the max payload size of a qp | |
1901 | * @qp: NTB transport layer queue to be queried | |
1902 | * | |
1903 | * Query the maximum payload size permissible on the given qp | |
1904 | * | |
1905 | * RETURNS: the max payload size of a qp | |
1906 | */ | |
ef114ed5 | 1907 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1908 | { |
282a2fee JM |
1909 | unsigned int max; |
1910 | ||
186f27ff JM |
1911 | if (!qp) |
1912 | return 0; | |
1913 | ||
282a2fee JM |
1914 | if (!qp->dma_chan) |
1915 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1916 | ||
1917 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1918 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1919 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1920 | ||
1921 | return max; | |
fce8a7bb JM |
1922 | } |
1923 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 AH |
1924 | |
1925 | static void ntb_transport_doorbell_callback(void *data, int vector) | |
1926 | { | |
1927 | struct ntb_transport_ctx *nt = data; | |
1928 | struct ntb_transport_qp *qp; | |
1929 | u64 db_bits; | |
1930 | unsigned int qp_num; | |
1931 | ||
1932 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
1933 | ntb_db_vector_mask(nt->ndev, vector)); | |
1934 | ||
1935 | while (db_bits) { | |
1936 | qp_num = __ffs(db_bits); | |
1937 | qp = &nt->qp_vec[qp_num]; | |
1938 | ||
1939 | tasklet_schedule(&qp->rxc_db_work); | |
1940 | ||
1941 | db_bits &= ~BIT_ULL(qp_num); | |
1942 | } | |
1943 | } | |
1944 | ||
1945 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
1946 | .link_event = ntb_transport_event_callback, | |
1947 | .db_event = ntb_transport_doorbell_callback, | |
1948 | }; | |
1949 | ||
1950 | static struct ntb_client ntb_transport_client = { | |
1951 | .ops = { | |
1952 | .probe = ntb_transport_probe, | |
1953 | .remove = ntb_transport_free, | |
1954 | }, | |
1955 | }; | |
1956 | ||
1957 | static int __init ntb_transport_init(void) | |
1958 | { | |
1959 | int rc; | |
1960 | ||
7eb38781 DJ |
1961 | pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
1962 | ||
e26a5843 AH |
1963 | if (debugfs_initialized()) |
1964 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
1965 | ||
1966 | rc = bus_register(&ntb_transport_bus); | |
1967 | if (rc) | |
1968 | goto err_bus; | |
1969 | ||
1970 | rc = ntb_register_client(&ntb_transport_client); | |
1971 | if (rc) | |
1972 | goto err_client; | |
1973 | ||
1974 | return 0; | |
1975 | ||
1976 | err_client: | |
1977 | bus_unregister(&ntb_transport_bus); | |
1978 | err_bus: | |
1979 | debugfs_remove_recursive(nt_debugfs_dir); | |
1980 | return rc; | |
1981 | } | |
1982 | module_init(ntb_transport_init); | |
1983 | ||
1984 | static void __exit ntb_transport_exit(void) | |
1985 | { | |
1986 | debugfs_remove_recursive(nt_debugfs_dir); | |
1987 | ||
1988 | ntb_unregister_client(&ntb_transport_client); | |
1989 | bus_unregister(&ntb_transport_bus); | |
1990 | } | |
1991 | module_exit(ntb_transport_exit); |