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; |
569410ca DJ |
122 | struct dma_chan *tx_dma_chan; |
123 | struct dma_chan *rx_dma_chan; | |
fce8a7bb JM |
124 | |
125 | bool client_ready; | |
e26a5843 AH |
126 | bool link_is_up; |
127 | ||
fce8a7bb | 128 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 129 | u64 qp_bit; |
fce8a7bb | 130 | |
74465645 | 131 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
132 | struct ntb_rx_info *remote_rx_info; |
133 | ||
53ca4fea JM |
134 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
135 | void *data, int len); | |
fce8a7bb JM |
136 | struct list_head tx_free_q; |
137 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 138 | void __iomem *tx_mw; |
282a2fee | 139 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
140 | unsigned int tx_index; |
141 | unsigned int tx_max_entry; | |
ef114ed5 | 142 | unsigned int tx_max_frame; |
fce8a7bb | 143 | |
53ca4fea JM |
144 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
145 | void *data, int len); | |
da2e5ae5 | 146 | struct list_head rx_post_q; |
fce8a7bb JM |
147 | struct list_head rx_pend_q; |
148 | struct list_head rx_free_q; | |
da2e5ae5 AH |
149 | /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */ |
150 | spinlock_t ntb_rx_q_lock; | |
793c20e9 JM |
151 | void *rx_buff; |
152 | unsigned int rx_index; | |
153 | unsigned int rx_max_entry; | |
ef114ed5 | 154 | unsigned int rx_max_frame; |
282a2fee | 155 | dma_cookie_t last_cookie; |
e26a5843 | 156 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 157 | |
53ca4fea | 158 | void (*event_handler)(void *data, int status); |
fce8a7bb | 159 | struct delayed_work link_work; |
7b4f2d3c | 160 | struct work_struct link_cleanup; |
fce8a7bb JM |
161 | |
162 | struct dentry *debugfs_dir; | |
163 | struct dentry *debugfs_stats; | |
164 | ||
165 | /* Stats */ | |
166 | u64 rx_bytes; | |
167 | u64 rx_pkts; | |
168 | u64 rx_ring_empty; | |
169 | u64 rx_err_no_buf; | |
170 | u64 rx_err_oflow; | |
171 | u64 rx_err_ver; | |
282a2fee JM |
172 | u64 rx_memcpy; |
173 | u64 rx_async; | |
8c874cc1 | 174 | u64 dma_rx_prep_err; |
fce8a7bb JM |
175 | u64 tx_bytes; |
176 | u64 tx_pkts; | |
177 | u64 tx_ring_full; | |
282a2fee JM |
178 | u64 tx_err_no_buf; |
179 | u64 tx_memcpy; | |
180 | u64 tx_async; | |
8c874cc1 | 181 | u64 dma_tx_prep_err; |
fce8a7bb JM |
182 | }; |
183 | ||
184 | struct ntb_transport_mw { | |
e26a5843 AH |
185 | phys_addr_t phys_addr; |
186 | resource_size_t phys_size; | |
187 | resource_size_t xlat_align; | |
188 | resource_size_t xlat_align_size; | |
189 | void __iomem *vbase; | |
190 | size_t xlat_size; | |
191 | size_t buff_size; | |
fce8a7bb JM |
192 | void *virt_addr; |
193 | dma_addr_t dma_addr; | |
194 | }; | |
195 | ||
196 | struct ntb_transport_client_dev { | |
197 | struct list_head entry; | |
e26a5843 | 198 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
199 | struct device dev; |
200 | }; | |
201 | ||
e26a5843 | 202 | struct ntb_transport_ctx { |
fce8a7bb JM |
203 | struct list_head entry; |
204 | struct list_head client_devs; | |
205 | ||
e26a5843 AH |
206 | struct ntb_dev *ndev; |
207 | ||
208 | struct ntb_transport_mw *mw_vec; | |
209 | struct ntb_transport_qp *qp_vec; | |
210 | unsigned int mw_count; | |
211 | unsigned int qp_count; | |
212 | u64 qp_bitmap; | |
213 | u64 qp_bitmap_free; | |
214 | ||
215 | bool link_is_up; | |
fce8a7bb | 216 | struct delayed_work link_work; |
7b4f2d3c | 217 | struct work_struct link_cleanup; |
c8650fd0 DJ |
218 | |
219 | struct dentry *debugfs_node_dir; | |
fce8a7bb JM |
220 | }; |
221 | ||
222 | enum { | |
e26a5843 AH |
223 | DESC_DONE_FLAG = BIT(0), |
224 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
225 | }; |
226 | ||
227 | struct ntb_payload_header { | |
74465645 | 228 | unsigned int ver; |
fce8a7bb JM |
229 | unsigned int len; |
230 | unsigned int flags; | |
231 | }; | |
232 | ||
233 | enum { | |
234 | VERSION = 0, | |
fce8a7bb | 235 | QP_LINKS, |
113fc505 JM |
236 | NUM_QPS, |
237 | NUM_MWS, | |
238 | MW0_SZ_HIGH, | |
239 | MW0_SZ_LOW, | |
240 | MW1_SZ_HIGH, | |
241 | MW1_SZ_LOW, | |
fce8a7bb JM |
242 | MAX_SPAD, |
243 | }; | |
244 | ||
e26a5843 AH |
245 | #define dev_client_dev(__dev) \ |
246 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
247 | ||
248 | #define drv_client(__drv) \ | |
249 | container_of((__drv), struct ntb_transport_client, driver) | |
250 | ||
251 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
252 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
253 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
8c874cc1 DJ |
254 | #define DMA_RETRIES 20 |
255 | #define DMA_OUT_RESOURCE_TO 50 | |
fce8a7bb | 256 | |
e26a5843 AH |
257 | static void ntb_transport_rxc_db(unsigned long data); |
258 | static const struct ntb_ctx_ops ntb_transport_ops; | |
259 | static struct ntb_client ntb_transport_client; | |
260 | ||
261 | static int ntb_transport_bus_match(struct device *dev, | |
262 | struct device_driver *drv) | |
fce8a7bb JM |
263 | { |
264 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
265 | } | |
266 | ||
e26a5843 | 267 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 268 | { |
e26a5843 | 269 | const struct ntb_transport_client *client; |
fce8a7bb JM |
270 | int rc = -EINVAL; |
271 | ||
272 | get_device(dev); | |
e26a5843 AH |
273 | |
274 | client = drv_client(dev->driver); | |
275 | rc = client->probe(dev); | |
fce8a7bb JM |
276 | if (rc) |
277 | put_device(dev); | |
278 | ||
279 | return rc; | |
280 | } | |
281 | ||
e26a5843 | 282 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 283 | { |
e26a5843 | 284 | const struct ntb_transport_client *client; |
fce8a7bb | 285 | |
e26a5843 AH |
286 | client = drv_client(dev->driver); |
287 | client->remove(dev); | |
fce8a7bb JM |
288 | |
289 | put_device(dev); | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
e26a5843 AH |
294 | static struct bus_type ntb_transport_bus = { |
295 | .name = "ntb_transport", | |
296 | .match = ntb_transport_bus_match, | |
297 | .probe = ntb_transport_bus_probe, | |
298 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
299 | }; |
300 | ||
301 | static LIST_HEAD(ntb_transport_list); | |
302 | ||
e26a5843 | 303 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 304 | { |
31510000 | 305 | list_add_tail(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
306 | return 0; |
307 | } | |
308 | ||
e26a5843 | 309 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
310 | { |
311 | struct ntb_transport_client_dev *client_dev, *cd; | |
312 | ||
313 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
314 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
315 | dev_name(&client_dev->dev)); | |
316 | list_del(&client_dev->entry); | |
317 | device_unregister(&client_dev->dev); | |
318 | } | |
319 | ||
320 | list_del(&nt->entry); | |
fce8a7bb JM |
321 | } |
322 | ||
e26a5843 | 323 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
324 | { |
325 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 326 | |
e26a5843 | 327 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
328 | kfree(client_dev); |
329 | } | |
330 | ||
331 | /** | |
e26a5843 | 332 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
333 | * @device_name: Name of NTB client device |
334 | * | |
335 | * Unregister an NTB client device with the NTB transport layer | |
336 | */ | |
e26a5843 | 337 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
338 | { |
339 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 340 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
341 | |
342 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
343 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
344 | if (!strncmp(dev_name(&client->dev), device_name, | |
345 | strlen(device_name))) { | |
346 | list_del(&client->entry); | |
347 | device_unregister(&client->dev); | |
348 | } | |
349 | } | |
e26a5843 | 350 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
351 | |
352 | /** | |
e26a5843 | 353 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
354 | * @device_name: Name of NTB client device |
355 | * | |
356 | * Register an NTB client device with the NTB transport layer | |
357 | */ | |
e26a5843 | 358 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
359 | { |
360 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 361 | struct ntb_transport_ctx *nt; |
1199aa61 | 362 | int node; |
8b19d450 | 363 | int rc, i = 0; |
fce8a7bb | 364 | |
8222b402 JM |
365 | if (list_empty(&ntb_transport_list)) |
366 | return -ENODEV; | |
367 | ||
fce8a7bb JM |
368 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
369 | struct device *dev; | |
370 | ||
1199aa61 AH |
371 | node = dev_to_node(&nt->ndev->dev); |
372 | ||
373 | client_dev = kzalloc_node(sizeof(*client_dev), | |
374 | GFP_KERNEL, node); | |
fce8a7bb JM |
375 | if (!client_dev) { |
376 | rc = -ENOMEM; | |
377 | goto err; | |
378 | } | |
379 | ||
380 | dev = &client_dev->dev; | |
381 | ||
382 | /* setup and register client devices */ | |
8b19d450 | 383 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
384 | dev->bus = &ntb_transport_bus; |
385 | dev->release = ntb_transport_client_release; | |
386 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
387 | |
388 | rc = device_register(dev); | |
389 | if (rc) { | |
390 | kfree(client_dev); | |
391 | goto err; | |
392 | } | |
393 | ||
394 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 395 | i++; |
fce8a7bb JM |
396 | } |
397 | ||
398 | return 0; | |
399 | ||
400 | err: | |
e26a5843 | 401 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
402 | |
403 | return rc; | |
404 | } | |
e26a5843 | 405 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
406 | |
407 | /** | |
ec110bc7 | 408 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
409 | * @drv: NTB client driver to be registered |
410 | * | |
411 | * Register an NTB client driver with the NTB transport layer | |
412 | * | |
413 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
414 | */ | |
e26a5843 | 415 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 416 | { |
e26a5843 | 417 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 418 | |
8222b402 JM |
419 | if (list_empty(&ntb_transport_list)) |
420 | return -ENODEV; | |
421 | ||
fce8a7bb JM |
422 | return driver_register(&drv->driver); |
423 | } | |
ec110bc7 | 424 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
425 | |
426 | /** | |
ec110bc7 | 427 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
428 | * @drv: NTB client driver to be unregistered |
429 | * | |
430 | * Unregister an NTB client driver with the NTB transport layer | |
431 | * | |
432 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
433 | */ | |
e26a5843 | 434 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
435 | { |
436 | driver_unregister(&drv->driver); | |
437 | } | |
ec110bc7 | 438 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 439 | |
fce8a7bb JM |
440 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
441 | loff_t *offp) | |
442 | { | |
443 | struct ntb_transport_qp *qp; | |
d7237e22 | 444 | char *buf; |
fce8a7bb JM |
445 | ssize_t ret, out_offset, out_count; |
446 | ||
260bee94 DJ |
447 | qp = filp->private_data; |
448 | ||
449 | if (!qp || !qp->link_is_up) | |
450 | return 0; | |
451 | ||
282a2fee | 452 | out_count = 1000; |
d7237e22 JM |
453 | |
454 | buf = kmalloc(out_count, GFP_KERNEL); | |
455 | if (!buf) | |
456 | return -ENOMEM; | |
fce8a7bb | 457 | |
fce8a7bb JM |
458 | out_offset = 0; |
459 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 460 | "\nNTB QP stats:\n\n"); |
fce8a7bb JM |
461 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
462 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
463 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
464 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
465 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
466 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
467 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
468 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
469 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
470 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
471 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
472 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
473 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
474 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
475 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
476 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
477 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 478 | "rx_buff - \t0x%p\n", qp->rx_buff); |
fce8a7bb | 479 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 480 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 481 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 482 | "rx_max_entry - \t%u\n\n", qp->rx_max_entry); |
fce8a7bb JM |
483 | |
484 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
485 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
486 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
487 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
488 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
489 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
490 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
491 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
492 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
493 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
494 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
495 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 496 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 497 | "tx_mw - \t0x%p\n", qp->tx_mw); |
fce8a7bb | 498 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 499 | "tx_index (H) - \t%u\n", qp->tx_index); |
fce8a7bb | 500 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 501 | "RRI (T) - \t%u\n", |
e74bfeed | 502 | qp->remote_rx_info->entry); |
d98ef99e DJ |
503 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
504 | "tx_max_entry - \t%u\n", qp->tx_max_entry); | |
e74bfeed DJ |
505 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
506 | "free tx - \t%u\n", | |
507 | ntb_transport_tx_free_entry(qp)); | |
8c874cc1 DJ |
508 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
509 | "DMA tx prep err - \t%llu\n", | |
510 | qp->dma_tx_prep_err); | |
511 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
512 | "DMA rx prep err - \t%llu\n", | |
513 | qp->dma_rx_prep_err); | |
fce8a7bb JM |
514 | |
515 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e DJ |
516 | "\n"); |
517 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
569410ca DJ |
518 | "Using TX DMA - \t%s\n", |
519 | qp->tx_dma_chan ? "Yes" : "No"); | |
520 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
521 | "Using RX DMA - \t%s\n", | |
522 | qp->rx_dma_chan ? "Yes" : "No"); | |
d98ef99e DJ |
523 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
524 | "QP Link - \t%s\n", | |
e26a5843 | 525 | qp->link_is_up ? "Up" : "Down"); |
d98ef99e DJ |
526 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
527 | "\n"); | |
528 | ||
d7237e22 JM |
529 | if (out_offset > out_count) |
530 | out_offset = out_count; | |
fce8a7bb JM |
531 | |
532 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 533 | kfree(buf); |
fce8a7bb JM |
534 | return ret; |
535 | } | |
536 | ||
537 | static const struct file_operations ntb_qp_debugfs_stats = { | |
538 | .owner = THIS_MODULE, | |
d66d7ac2 | 539 | .open = simple_open, |
fce8a7bb JM |
540 | .read = debugfs_read, |
541 | }; | |
542 | ||
543 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
544 | struct list_head *list) | |
545 | { | |
546 | unsigned long flags; | |
547 | ||
548 | spin_lock_irqsave(lock, flags); | |
549 | list_add_tail(entry, list); | |
550 | spin_unlock_irqrestore(lock, flags); | |
551 | } | |
552 | ||
553 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 554 | struct list_head *list) |
fce8a7bb JM |
555 | { |
556 | struct ntb_queue_entry *entry; | |
557 | unsigned long flags; | |
558 | ||
559 | spin_lock_irqsave(lock, flags); | |
560 | if (list_empty(list)) { | |
561 | entry = NULL; | |
562 | goto out; | |
563 | } | |
564 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
565 | list_del(&entry->entry); | |
e74bfeed | 566 | |
fce8a7bb JM |
567 | out: |
568 | spin_unlock_irqrestore(lock, flags); | |
569 | ||
570 | return entry; | |
571 | } | |
572 | ||
da2e5ae5 AH |
573 | static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock, |
574 | struct list_head *list, | |
575 | struct list_head *to_list) | |
576 | { | |
577 | struct ntb_queue_entry *entry; | |
578 | unsigned long flags; | |
579 | ||
580 | spin_lock_irqsave(lock, flags); | |
581 | ||
582 | if (list_empty(list)) { | |
583 | entry = NULL; | |
584 | } else { | |
585 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
586 | list_move_tail(&entry->entry, to_list); | |
587 | } | |
588 | ||
589 | spin_unlock_irqrestore(lock, flags); | |
590 | ||
591 | return entry; | |
592 | } | |
593 | ||
e26a5843 AH |
594 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
595 | unsigned int qp_num) | |
fce8a7bb | 596 | { |
e26a5843 AH |
597 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
598 | struct ntb_transport_mw *mw; | |
ef114ed5 | 599 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 600 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 601 | unsigned int i; |
fce8a7bb | 602 | |
e26a5843 AH |
603 | mw_count = nt->mw_count; |
604 | qp_count = nt->qp_count; | |
948d3a65 | 605 | |
e26a5843 AH |
606 | mw_num = QP_TO_MW(nt, qp_num); |
607 | mw = &nt->mw_vec[mw_num]; | |
608 | ||
609 | if (!mw->virt_addr) | |
610 | return -ENOMEM; | |
fce8a7bb | 611 | |
e26a5843 AH |
612 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
613 | num_qps_mw = qp_count / mw_count + 1; | |
fce8a7bb | 614 | else |
e26a5843 | 615 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 616 | |
e26a5843 | 617 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
c92ba3c5 | 618 | qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); |
793c20e9 JM |
619 | rx_size -= sizeof(struct ntb_rx_info); |
620 | ||
282a2fee JM |
621 | qp->remote_rx_info = qp->rx_buff + rx_size; |
622 | ||
c9d534c8 JM |
623 | /* Due to housekeeping, there must be atleast 2 buffs */ |
624 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
625 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
626 | qp->rx_index = 0; | |
627 | ||
c9d534c8 | 628 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 629 | |
ef114ed5 | 630 | /* setup the hdr offsets with 0's */ |
793c20e9 | 631 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
632 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
633 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 634 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 635 | } |
fce8a7bb JM |
636 | |
637 | qp->rx_pkts = 0; | |
638 | qp->tx_pkts = 0; | |
90f9e934 | 639 | qp->tx_index = 0; |
e26a5843 AH |
640 | |
641 | return 0; | |
fce8a7bb JM |
642 | } |
643 | ||
e26a5843 | 644 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 645 | { |
e26a5843 AH |
646 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
647 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
648 | |
649 | if (!mw->virt_addr) | |
650 | return; | |
651 | ||
e26a5843 AH |
652 | ntb_mw_clear_trans(nt->ndev, num_mw); |
653 | dma_free_coherent(&pdev->dev, mw->buff_size, | |
654 | mw->virt_addr, mw->dma_addr); | |
655 | mw->xlat_size = 0; | |
656 | mw->buff_size = 0; | |
b77b2637 JM |
657 | mw->virt_addr = NULL; |
658 | } | |
659 | ||
e26a5843 | 660 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
8c9edf63 | 661 | resource_size_t size) |
fce8a7bb | 662 | { |
e26a5843 AH |
663 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
664 | struct pci_dev *pdev = nt->ndev->pdev; | |
8c9edf63 | 665 | size_t xlat_size, buff_size; |
e26a5843 AH |
666 | int rc; |
667 | ||
8c9edf63 AH |
668 | if (!size) |
669 | return -EINVAL; | |
670 | ||
e26a5843 AH |
671 | xlat_size = round_up(size, mw->xlat_align_size); |
672 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 673 | |
b77b2637 | 674 | /* No need to re-setup */ |
e26a5843 | 675 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
676 | return 0; |
677 | ||
e26a5843 | 678 | if (mw->buff_size) |
b77b2637 JM |
679 | ntb_free_mw(nt, num_mw); |
680 | ||
e26a5843 AH |
681 | /* Alloc memory for receiving data. Must be aligned */ |
682 | mw->xlat_size = xlat_size; | |
683 | mw->buff_size = buff_size; | |
fce8a7bb | 684 | |
e26a5843 AH |
685 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
686 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 687 | if (!mw->virt_addr) { |
e26a5843 AH |
688 | mw->xlat_size = 0; |
689 | mw->buff_size = 0; | |
8c9edf63 | 690 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %zu\n", |
e26a5843 | 691 | buff_size); |
fce8a7bb JM |
692 | return -ENOMEM; |
693 | } | |
694 | ||
3cc5ba19 DJ |
695 | /* |
696 | * we must ensure that the memory address allocated is BAR size | |
697 | * aligned in order for the XLAT register to take the value. This | |
698 | * is a requirement of the hardware. It is recommended to setup CMA | |
699 | * for BAR sizes equal or greater than 4MB. | |
700 | */ | |
e26a5843 AH |
701 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
702 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
703 | &mw->dma_addr); |
704 | ntb_free_mw(nt, num_mw); | |
705 | return -ENOMEM; | |
706 | } | |
707 | ||
fce8a7bb | 708 | /* Notify HW the memory location of the receive buffer */ |
e26a5843 AH |
709 | rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
710 | if (rc) { | |
711 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
712 | ntb_free_mw(nt, num_mw); | |
713 | return -EIO; | |
714 | } | |
fce8a7bb JM |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
2849b5d7 AH |
719 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
720 | { | |
721 | qp->link_is_up = false; | |
722 | ||
723 | qp->tx_index = 0; | |
724 | qp->rx_index = 0; | |
725 | qp->rx_bytes = 0; | |
726 | qp->rx_pkts = 0; | |
727 | qp->rx_ring_empty = 0; | |
728 | qp->rx_err_no_buf = 0; | |
729 | qp->rx_err_oflow = 0; | |
730 | qp->rx_err_ver = 0; | |
731 | qp->rx_memcpy = 0; | |
732 | qp->rx_async = 0; | |
733 | qp->tx_bytes = 0; | |
734 | qp->tx_pkts = 0; | |
735 | qp->tx_ring_full = 0; | |
736 | qp->tx_err_no_buf = 0; | |
737 | qp->tx_memcpy = 0; | |
738 | qp->tx_async = 0; | |
8c874cc1 DJ |
739 | qp->dma_tx_prep_err = 0; |
740 | qp->dma_rx_prep_err = 0; | |
2849b5d7 AH |
741 | } |
742 | ||
fca4d518 | 743 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 744 | { |
e26a5843 AH |
745 | struct ntb_transport_ctx *nt = qp->transport; |
746 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 747 | |
e22e0b9d | 748 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
749 | |
750 | cancel_delayed_work_sync(&qp->link_work); | |
751 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
752 | |
753 | if (qp->event_handler) | |
754 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
755 | } |
756 | ||
757 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
758 | { | |
759 | struct ntb_transport_qp *qp = container_of(work, | |
760 | struct ntb_transport_qp, | |
761 | link_cleanup); | |
e26a5843 | 762 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
763 | |
764 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 765 | |
e26a5843 | 766 | if (nt->link_is_up) |
fce8a7bb JM |
767 | schedule_delayed_work(&qp->link_work, |
768 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
769 | } | |
770 | ||
7b4f2d3c JM |
771 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
772 | { | |
773 | schedule_work(&qp->link_cleanup); | |
774 | } | |
775 | ||
e26a5843 | 776 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 777 | { |
e26a5843 AH |
778 | struct ntb_transport_qp *qp; |
779 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
780 | int i; |
781 | ||
e26a5843 AH |
782 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
783 | ||
fca4d518 | 784 | /* Pass along the info to any clients */ |
e26a5843 AH |
785 | for (i = 0; i < nt->qp_count; i++) |
786 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
787 | qp = &nt->qp_vec[i]; | |
788 | ntb_qp_link_cleanup(qp); | |
789 | cancel_work_sync(&qp->link_cleanup); | |
790 | cancel_delayed_work_sync(&qp->link_work); | |
791 | } | |
fca4d518 | 792 | |
e26a5843 | 793 | if (!nt->link_is_up) |
fce8a7bb | 794 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 795 | |
fce8a7bb JM |
796 | /* The scratchpad registers keep the values if the remote side |
797 | * goes down, blast them now to give them a sane value the next | |
798 | * time they are accessed | |
799 | */ | |
800 | for (i = 0; i < MAX_SPAD; i++) | |
e26a5843 | 801 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
802 | } |
803 | ||
fca4d518 JM |
804 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
805 | { | |
e26a5843 AH |
806 | struct ntb_transport_ctx *nt = |
807 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
808 | |
809 | ntb_transport_link_cleanup(nt); | |
810 | } | |
811 | ||
e26a5843 | 812 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 813 | { |
e26a5843 | 814 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 815 | |
e26a5843 | 816 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 817 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 818 | else |
7b4f2d3c | 819 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
820 | } |
821 | ||
822 | static void ntb_transport_link_work(struct work_struct *work) | |
823 | { | |
e26a5843 AH |
824 | struct ntb_transport_ctx *nt = |
825 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
826 | struct ntb_dev *ndev = nt->ndev; | |
827 | struct pci_dev *pdev = ndev->pdev; | |
828 | resource_size_t size; | |
fce8a7bb | 829 | u32 val; |
e26a5843 | 830 | int rc, i, spad; |
fce8a7bb | 831 | |
113fc505 | 832 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
833 | for (i = 0; i < nt->mw_count; i++) { |
834 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 835 | |
e26a5843 AH |
836 | if (max_mw_size && size > max_mw_size) |
837 | size = max_mw_size; | |
fce8a7bb | 838 | |
e26a5843 | 839 | spad = MW0_SZ_HIGH + (i * 2); |
fdcb4b2e | 840 | ntb_peer_spad_write(ndev, spad, upper_32_bits(size)); |
fce8a7bb | 841 | |
e26a5843 | 842 | spad = MW0_SZ_LOW + (i * 2); |
fdcb4b2e | 843 | ntb_peer_spad_write(ndev, spad, lower_32_bits(size)); |
fce8a7bb JM |
844 | } |
845 | ||
e26a5843 | 846 | ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
fce8a7bb | 847 | |
e26a5843 | 848 | ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
fce8a7bb | 849 | |
e26a5843 | 850 | ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 851 | |
e26a5843 | 852 | /* Query the remote side for its info */ |
0f69a7df | 853 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
854 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
855 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 856 | goto out; |
fce8a7bb | 857 | |
0f69a7df | 858 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 859 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 860 | if (val != nt->qp_count) |
fce8a7bb | 861 | goto out; |
fce8a7bb | 862 | |
0f69a7df | 863 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 864 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
865 | if (val != nt->mw_count) |
866 | goto out; | |
fce8a7bb | 867 | |
e26a5843 | 868 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 869 | u64 val64; |
fce8a7bb | 870 | |
0f69a7df | 871 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 872 | val64 = (u64)val << 32; |
113fc505 | 873 | |
0f69a7df | 874 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
875 | val64 |= val; |
876 | ||
e26a5843 | 877 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
878 | |
879 | rc = ntb_set_mw(nt, i, val64); | |
880 | if (rc) | |
881 | goto out1; | |
882 | } | |
fce8a7bb | 883 | |
e26a5843 | 884 | nt->link_is_up = true; |
fce8a7bb | 885 | |
e26a5843 AH |
886 | for (i = 0; i < nt->qp_count; i++) { |
887 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
888 | |
889 | ntb_transport_setup_qp_mw(nt, i); | |
890 | ||
e26a5843 | 891 | if (qp->client_ready) |
fce8a7bb JM |
892 | schedule_delayed_work(&qp->link_work, 0); |
893 | } | |
894 | ||
895 | return; | |
896 | ||
113fc505 | 897 | out1: |
e26a5843 | 898 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 899 | ntb_free_mw(nt, i); |
fce8a7bb | 900 | out: |
e26a5843 | 901 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
902 | schedule_delayed_work(&nt->link_work, |
903 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
904 | } | |
905 | ||
906 | static void ntb_qp_link_work(struct work_struct *work) | |
907 | { | |
908 | struct ntb_transport_qp *qp = container_of(work, | |
909 | struct ntb_transport_qp, | |
910 | link_work.work); | |
e26a5843 AH |
911 | struct pci_dev *pdev = qp->ndev->pdev; |
912 | struct ntb_transport_ctx *nt = qp->transport; | |
913 | int val; | |
fce8a7bb | 914 | |
e26a5843 | 915 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 916 | |
e26a5843 | 917 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 918 | |
e26a5843 | 919 | ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
920 | |
921 | /* query remote spad for qp ready bits */ | |
e26a5843 | 922 | ntb_peer_spad_read(nt->ndev, QP_LINKS); |
28762289 | 923 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
924 | |
925 | /* See if the remote side is up */ | |
e26a5843 | 926 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 927 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 AH |
928 | qp->link_is_up = true; |
929 | ||
fce8a7bb | 930 | if (qp->event_handler) |
e26a5843 | 931 | qp->event_handler(qp->cb_data, qp->link_is_up); |
8b5a22d8 AH |
932 | |
933 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 934 | } else if (nt->link_is_up) |
fce8a7bb JM |
935 | schedule_delayed_work(&qp->link_work, |
936 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
937 | } | |
938 | ||
e26a5843 | 939 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 940 | unsigned int qp_num) |
fce8a7bb JM |
941 | { |
942 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
943 | phys_addr_t mw_base; |
944 | resource_size_t mw_size; | |
ef114ed5 | 945 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 946 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 947 | u64 qp_offset; |
948d3a65 | 948 | |
e26a5843 AH |
949 | mw_count = nt->mw_count; |
950 | qp_count = nt->qp_count; | |
fce8a7bb | 951 | |
e26a5843 | 952 | mw_num = QP_TO_MW(nt, qp_num); |
e26a5843 AH |
953 | |
954 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
955 | qp->qp_num = qp_num; |
956 | qp->transport = nt; | |
957 | qp->ndev = nt->ndev; | |
e26a5843 | 958 | qp->client_ready = false; |
fce8a7bb | 959 | qp->event_handler = NULL; |
2849b5d7 | 960 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 961 | |
e26a5843 AH |
962 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
963 | num_qps_mw = qp_count / mw_count + 1; | |
ef114ed5 | 964 | else |
e26a5843 AH |
965 | num_qps_mw = qp_count / mw_count; |
966 | ||
967 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
968 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 969 | |
e26a5843 | 970 | tx_size = (unsigned int)mw_size / num_qps_mw; |
c92ba3c5 | 971 | qp_offset = tx_size * (qp_num / mw_count); |
e26a5843 AH |
972 | |
973 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
974 | if (!qp->tx_mw) |
975 | return -EINVAL; | |
976 | ||
e26a5843 | 977 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
978 | if (!qp->tx_mw_phys) |
979 | return -EINVAL; | |
980 | ||
793c20e9 | 981 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 982 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 983 | |
c9d534c8 JM |
984 | /* Due to housekeeping, there must be atleast 2 buffs */ |
985 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 986 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 987 | |
c8650fd0 | 988 | if (nt->debugfs_node_dir) { |
fce8a7bb JM |
989 | char debugfs_name[4]; |
990 | ||
991 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
992 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
c8650fd0 | 993 | nt->debugfs_node_dir); |
fce8a7bb JM |
994 | |
995 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
996 | qp->debugfs_dir, qp, | |
997 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
998 | } else { |
999 | qp->debugfs_dir = NULL; | |
1000 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
1001 | } |
1002 | ||
1003 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 1004 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb | 1005 | |
da2e5ae5 | 1006 | spin_lock_init(&qp->ntb_rx_q_lock); |
fce8a7bb JM |
1007 | spin_lock_init(&qp->ntb_tx_free_q_lock); |
1008 | ||
da2e5ae5 | 1009 | INIT_LIST_HEAD(&qp->rx_post_q); |
fce8a7bb JM |
1010 | INIT_LIST_HEAD(&qp->rx_pend_q); |
1011 | INIT_LIST_HEAD(&qp->rx_free_q); | |
1012 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 1013 | |
e26a5843 AH |
1014 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
1015 | (unsigned long)qp); | |
1016 | ||
282a2fee | 1017 | return 0; |
fce8a7bb JM |
1018 | } |
1019 | ||
e26a5843 | 1020 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1021 | { |
e26a5843 AH |
1022 | struct ntb_transport_ctx *nt; |
1023 | struct ntb_transport_mw *mw; | |
1024 | unsigned int mw_count, qp_count; | |
1025 | u64 qp_bitmap; | |
1199aa61 | 1026 | int node; |
fce8a7bb JM |
1027 | int rc, i; |
1028 | ||
e26a5843 AH |
1029 | if (ntb_db_is_unsafe(ndev)) |
1030 | dev_dbg(&ndev->dev, | |
1031 | "doorbell is unsafe, proceed anyway...\n"); | |
1032 | if (ntb_spad_is_unsafe(ndev)) | |
1033 | dev_dbg(&ndev->dev, | |
1034 | "scratchpad is unsafe, proceed anyway...\n"); | |
1035 | ||
1199aa61 AH |
1036 | node = dev_to_node(&ndev->dev); |
1037 | ||
1038 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
1039 | if (!nt) |
1040 | return -ENOMEM; | |
1041 | ||
e26a5843 AH |
1042 | nt->ndev = ndev; |
1043 | ||
1044 | mw_count = ntb_mw_count(ndev); | |
1045 | ||
1046 | nt->mw_count = mw_count; | |
1047 | ||
1199aa61 AH |
1048 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
1049 | GFP_KERNEL, node); | |
e26a5843 AH |
1050 | if (!nt->mw_vec) { |
1051 | rc = -ENOMEM; | |
fce8a7bb JM |
1052 | goto err; |
1053 | } | |
1054 | ||
e26a5843 AH |
1055 | for (i = 0; i < mw_count; i++) { |
1056 | mw = &nt->mw_vec[i]; | |
1057 | ||
1058 | rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, | |
1059 | &mw->xlat_align, &mw->xlat_align_size); | |
1060 | if (rc) | |
1061 | goto err1; | |
1062 | ||
06917f75 | 1063 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
1064 | if (!mw->vbase) { |
1065 | rc = -ENOMEM; | |
1066 | goto err1; | |
1067 | } | |
1068 | ||
1069 | mw->buff_size = 0; | |
1070 | mw->xlat_size = 0; | |
1071 | mw->virt_addr = NULL; | |
1072 | mw->dma_addr = 0; | |
948d3a65 JM |
1073 | } |
1074 | ||
e26a5843 AH |
1075 | qp_bitmap = ntb_db_valid_mask(ndev); |
1076 | ||
1077 | qp_count = ilog2(qp_bitmap); | |
1078 | if (max_num_clients && max_num_clients < qp_count) | |
1079 | qp_count = max_num_clients; | |
1080 | else if (mw_count < qp_count) | |
1081 | qp_count = mw_count; | |
1082 | ||
1083 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1084 | ||
1085 | nt->qp_count = qp_count; | |
1086 | nt->qp_bitmap = qp_bitmap; | |
1087 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1088 | |
1199aa61 AH |
1089 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1090 | GFP_KERNEL, node); | |
e26a5843 | 1091 | if (!nt->qp_vec) { |
fce8a7bb | 1092 | rc = -ENOMEM; |
d4adee09 | 1093 | goto err1; |
fce8a7bb JM |
1094 | } |
1095 | ||
c8650fd0 DJ |
1096 | if (nt_debugfs_dir) { |
1097 | nt->debugfs_node_dir = | |
1098 | debugfs_create_dir(pci_name(ndev->pdev), | |
1099 | nt_debugfs_dir); | |
1100 | } | |
1101 | ||
e26a5843 | 1102 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1103 | rc = ntb_transport_init_queue(nt, i); |
1104 | if (rc) | |
d4adee09 | 1105 | goto err2; |
282a2fee | 1106 | } |
fce8a7bb JM |
1107 | |
1108 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1109 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1110 | |
e26a5843 | 1111 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1112 | if (rc) |
d4adee09 | 1113 | goto err2; |
fce8a7bb JM |
1114 | |
1115 | INIT_LIST_HEAD(&nt->client_devs); | |
1116 | rc = ntb_bus_init(nt); | |
1117 | if (rc) | |
d4adee09 | 1118 | goto err3; |
fce8a7bb | 1119 | |
e26a5843 AH |
1120 | nt->link_is_up = false; |
1121 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1122 | ntb_link_event(ndev); | |
fce8a7bb JM |
1123 | |
1124 | return 0; | |
1125 | ||
948d3a65 | 1126 | err3: |
d4adee09 | 1127 | ntb_clear_ctx(ndev); |
948d3a65 | 1128 | err2: |
d4adee09 | 1129 | kfree(nt->qp_vec); |
fce8a7bb | 1130 | err1: |
e26a5843 AH |
1131 | while (i--) { |
1132 | mw = &nt->mw_vec[i]; | |
1133 | iounmap(mw->vbase); | |
1134 | } | |
d4adee09 | 1135 | kfree(nt->mw_vec); |
fce8a7bb | 1136 | err: |
fce8a7bb JM |
1137 | kfree(nt); |
1138 | return rc; | |
1139 | } | |
1140 | ||
e26a5843 | 1141 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1142 | { |
e26a5843 AH |
1143 | struct ntb_transport_ctx *nt = ndev->ctx; |
1144 | struct ntb_transport_qp *qp; | |
1145 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1146 | int i; |
1147 | ||
fca4d518 | 1148 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1149 | cancel_work_sync(&nt->link_cleanup); |
1150 | cancel_delayed_work_sync(&nt->link_work); | |
1151 | ||
1152 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1153 | |
1154 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1155 | for (i = 0; i < nt->qp_count; i++) { |
1156 | qp = &nt->qp_vec[i]; | |
1157 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1158 | ntb_transport_free_queue(qp); | |
1159 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1160 | } |
fce8a7bb | 1161 | |
e26a5843 AH |
1162 | ntb_link_disable(ndev); |
1163 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1164 | |
e26a5843 | 1165 | ntb_bus_remove(nt); |
fce8a7bb | 1166 | |
e26a5843 | 1167 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1168 | ntb_free_mw(nt, i); |
e26a5843 AH |
1169 | iounmap(nt->mw_vec[i].vbase); |
1170 | } | |
fce8a7bb | 1171 | |
e26a5843 AH |
1172 | kfree(nt->qp_vec); |
1173 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1174 | kfree(nt); |
1175 | } | |
1176 | ||
da2e5ae5 | 1177 | static void ntb_complete_rxc(struct ntb_transport_qp *qp) |
fce8a7bb | 1178 | { |
da2e5ae5 AH |
1179 | struct ntb_queue_entry *entry; |
1180 | void *cb_data; | |
1181 | unsigned int len; | |
1182 | unsigned long irqflags; | |
1183 | ||
1184 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1185 | ||
1186 | while (!list_empty(&qp->rx_post_q)) { | |
1187 | entry = list_first_entry(&qp->rx_post_q, | |
1188 | struct ntb_queue_entry, entry); | |
1189 | if (!(entry->flags & DESC_DONE_FLAG)) | |
1190 | break; | |
1191 | ||
1192 | entry->rx_hdr->flags = 0; | |
1193 | iowrite32(entry->index, &qp->rx_info->entry); | |
1194 | ||
1195 | cb_data = entry->cb_data; | |
1196 | len = entry->len; | |
1197 | ||
1198 | list_move_tail(&entry->entry, &qp->rx_free_q); | |
1199 | ||
1200 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); | |
1201 | ||
1202 | if (qp->rx_handler && qp->client_ready) | |
1203 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
1204 | ||
1205 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1206 | } | |
282a2fee | 1207 | |
da2e5ae5 AH |
1208 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
1209 | } | |
fce8a7bb | 1210 | |
da2e5ae5 AH |
1211 | static void ntb_rx_copy_callback(void *data) |
1212 | { | |
1213 | struct ntb_queue_entry *entry = data; | |
fce8a7bb | 1214 | |
da2e5ae5 | 1215 | entry->flags |= DESC_DONE_FLAG; |
448c6fb3 | 1216 | |
da2e5ae5 | 1217 | ntb_complete_rxc(entry->qp); |
fce8a7bb JM |
1218 | } |
1219 | ||
282a2fee JM |
1220 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1221 | { | |
1222 | void *buf = entry->buf; | |
1223 | size_t len = entry->len; | |
1224 | ||
1225 | memcpy(buf, offset, len); | |
1226 | ||
e26a5843 AH |
1227 | /* Ensure that the data is fully copied out before clearing the flag */ |
1228 | wmb(); | |
1229 | ||
282a2fee JM |
1230 | ntb_rx_copy_callback(entry); |
1231 | } | |
1232 | ||
da2e5ae5 | 1233 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) |
282a2fee JM |
1234 | { |
1235 | struct dma_async_tx_descriptor *txd; | |
1236 | struct ntb_transport_qp *qp = entry->qp; | |
569410ca | 1237 | struct dma_chan *chan = qp->rx_dma_chan; |
282a2fee | 1238 | struct dma_device *device; |
da2e5ae5 | 1239 | size_t pay_off, buff_off, len; |
6f57fd05 | 1240 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1241 | dma_cookie_t cookie; |
1242 | void *buf = entry->buf; | |
8c874cc1 | 1243 | int retries = 0; |
282a2fee | 1244 | |
da2e5ae5 | 1245 | len = entry->len; |
282a2fee JM |
1246 | |
1247 | if (!chan) | |
1248 | goto err; | |
1249 | ||
53ca4fea | 1250 | if (len < copy_bytes) |
905921e7 | 1251 | goto err; |
282a2fee JM |
1252 | |
1253 | device = chan->device; | |
e26a5843 AH |
1254 | pay_off = (size_t)offset & ~PAGE_MASK; |
1255 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1256 | |
1257 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
905921e7 | 1258 | goto err; |
282a2fee | 1259 | |
6f57fd05 BZ |
1260 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1261 | if (!unmap) | |
905921e7 | 1262 | goto err; |
282a2fee | 1263 | |
6f57fd05 BZ |
1264 | unmap->len = len; |
1265 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1266 | pay_off, len, DMA_TO_DEVICE); | |
1267 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1268 | goto err_get_unmap; | |
1269 | ||
1270 | unmap->to_cnt = 1; | |
282a2fee | 1271 | |
6f57fd05 BZ |
1272 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1273 | buff_off, len, DMA_FROM_DEVICE); | |
1274 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1275 | goto err_get_unmap; | |
1276 | ||
1277 | unmap->from_cnt = 1; | |
1278 | ||
8c874cc1 DJ |
1279 | for (retries = 0; retries < DMA_RETRIES; retries++) { |
1280 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], | |
1281 | unmap->addr[0], len, | |
1282 | DMA_PREP_INTERRUPT); | |
1283 | if (txd) | |
1284 | break; | |
1285 | ||
1286 | set_current_state(TASK_INTERRUPTIBLE); | |
1287 | schedule_timeout(DMA_OUT_RESOURCE_TO); | |
1288 | } | |
1289 | ||
1290 | if (!txd) { | |
1291 | qp->dma_rx_prep_err++; | |
6f57fd05 | 1292 | goto err_get_unmap; |
8c874cc1 | 1293 | } |
282a2fee JM |
1294 | |
1295 | txd->callback = ntb_rx_copy_callback; | |
1296 | txd->callback_param = entry; | |
6f57fd05 | 1297 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1298 | |
1299 | cookie = dmaengine_submit(txd); | |
1300 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1301 | goto err_set_unmap; |
1302 | ||
1303 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1304 | |
1305 | qp->last_cookie = cookie; | |
1306 | ||
1307 | qp->rx_async++; | |
1308 | ||
1309 | return; | |
1310 | ||
6f57fd05 BZ |
1311 | err_set_unmap: |
1312 | dmaengine_unmap_put(unmap); | |
1313 | err_get_unmap: | |
1314 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1315 | err: |
1316 | ntb_memcpy_rx(entry, offset); | |
1317 | qp->rx_memcpy++; | |
1318 | } | |
1319 | ||
fce8a7bb JM |
1320 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1321 | { | |
1322 | struct ntb_payload_header *hdr; | |
1323 | struct ntb_queue_entry *entry; | |
1324 | void *offset; | |
1325 | ||
793c20e9 JM |
1326 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1327 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1328 | ||
e26a5843 AH |
1329 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1330 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1331 | |
fce8a7bb | 1332 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1333 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1334 | qp->rx_ring_empty++; |
1335 | return -EAGAIN; | |
1336 | } | |
1337 | ||
e26a5843 AH |
1338 | if (hdr->flags & LINK_DOWN_FLAG) { |
1339 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1340 | ntb_qp_link_down(qp); | |
1341 | hdr->flags = 0; | |
c0900b33 | 1342 | return -EAGAIN; |
e26a5843 AH |
1343 | } |
1344 | ||
1345 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1346 | dev_dbg(&qp->ndev->pdev->dev, | |
1347 | "version mismatch, expected %llu - got %u\n", | |
1348 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1349 | qp->rx_err_ver++; |
1350 | return -EIO; | |
1351 | } | |
1352 | ||
da2e5ae5 | 1353 | entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); |
e26a5843 AH |
1354 | if (!entry) { |
1355 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1356 | qp->rx_err_no_buf++; | |
da2e5ae5 | 1357 | return -EAGAIN; |
fce8a7bb JM |
1358 | } |
1359 | ||
da2e5ae5 AH |
1360 | entry->rx_hdr = hdr; |
1361 | entry->index = qp->rx_index; | |
1362 | ||
282a2fee | 1363 | if (hdr->len > entry->len) { |
e26a5843 AH |
1364 | dev_dbg(&qp->ndev->pdev->dev, |
1365 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1366 | hdr->len, entry->len); |
e26a5843 | 1367 | qp->rx_err_oflow++; |
282a2fee | 1368 | |
da2e5ae5 AH |
1369 | entry->len = -EIO; |
1370 | entry->flags |= DESC_DONE_FLAG; | |
fce8a7bb | 1371 | |
da2e5ae5 AH |
1372 | ntb_complete_rxc(qp); |
1373 | } else { | |
1374 | dev_dbg(&qp->ndev->pdev->dev, | |
1375 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1376 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
e26a5843 | 1377 | |
da2e5ae5 AH |
1378 | qp->rx_bytes += hdr->len; |
1379 | qp->rx_pkts++; | |
e26a5843 | 1380 | |
da2e5ae5 | 1381 | entry->len = hdr->len; |
282a2fee | 1382 | |
da2e5ae5 AH |
1383 | ntb_async_rx(entry, offset); |
1384 | } | |
fce8a7bb | 1385 | |
282a2fee JM |
1386 | qp->rx_index++; |
1387 | qp->rx_index %= qp->rx_max_entry; | |
1388 | ||
1389 | return 0; | |
fce8a7bb JM |
1390 | } |
1391 | ||
e26a5843 | 1392 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1393 | { |
e26a5843 | 1394 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1395 | int rc, i; |
fce8a7bb | 1396 | |
e26a5843 AH |
1397 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1398 | __func__, qp->qp_num); | |
e8aeb60c | 1399 | |
c336acd3 JM |
1400 | /* Limit the number of packets processed in a single interrupt to |
1401 | * provide fairness to others | |
1402 | */ | |
1403 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1404 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1405 | if (rc) |
1406 | break; | |
1407 | } | |
282a2fee | 1408 | |
569410ca DJ |
1409 | if (i && qp->rx_dma_chan) |
1410 | dma_async_issue_pending(qp->rx_dma_chan); | |
fce8a7bb | 1411 | |
e26a5843 AH |
1412 | if (i == qp->rx_max_entry) { |
1413 | /* there is more work to do */ | |
1414 | tasklet_schedule(&qp->rxc_db_work); | |
1415 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { | |
1416 | /* the doorbell bit is set: clear it */ | |
1417 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1418 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1419 | ntb_db_read(qp->ndev); | |
1420 | ||
1421 | /* an interrupt may have arrived between finishing | |
1422 | * ntb_process_rxc and clearing the doorbell bit: | |
1423 | * there might be some more work to do. | |
1424 | */ | |
1425 | tasklet_schedule(&qp->rxc_db_work); | |
1426 | } | |
fce8a7bb JM |
1427 | } |
1428 | ||
282a2fee | 1429 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1430 | { |
282a2fee JM |
1431 | struct ntb_queue_entry *entry = data; |
1432 | struct ntb_transport_qp *qp = entry->qp; | |
1433 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1434 | |
74465645 | 1435 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1436 | |
e26a5843 | 1437 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1438 | |
1439 | /* The entry length can only be zero if the packet is intended to be a | |
1440 | * "link down" or similar. Since no payload is being sent in these | |
1441 | * cases, there is nothing to add to the completion queue. | |
1442 | */ | |
1443 | if (entry->len > 0) { | |
1444 | qp->tx_bytes += entry->len; | |
1445 | ||
1446 | if (qp->tx_handler) | |
1447 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1448 | entry->len); | |
1449 | } | |
1450 | ||
1451 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1452 | } | |
1453 | ||
282a2fee | 1454 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1455 | { |
06917f75 DJ |
1456 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1457 | /* | |
1458 | * Using non-temporal mov to improve performance on non-cached | |
1459 | * writes, even though we aren't actually copying from user space. | |
1460 | */ | |
1461 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1462 | #else | |
282a2fee | 1463 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1464 | #endif |
282a2fee | 1465 | |
e26a5843 AH |
1466 | /* Ensure that the data is fully copied out before setting the flags */ |
1467 | wmb(); | |
1468 | ||
282a2fee JM |
1469 | ntb_tx_copy_callback(entry); |
1470 | } | |
1471 | ||
1472 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1473 | struct ntb_queue_entry *entry) | |
1474 | { | |
1475 | struct ntb_payload_header __iomem *hdr; | |
1476 | struct dma_async_tx_descriptor *txd; | |
569410ca | 1477 | struct dma_chan *chan = qp->tx_dma_chan; |
282a2fee JM |
1478 | struct dma_device *device; |
1479 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1480 | struct dmaengine_unmap_data *unmap; |
1481 | dma_addr_t dest; | |
282a2fee | 1482 | dma_cookie_t cookie; |
74465645 | 1483 | void __iomem *offset; |
282a2fee JM |
1484 | size_t len = entry->len; |
1485 | void *buf = entry->buf; | |
8c874cc1 | 1486 | int retries = 0; |
fce8a7bb | 1487 | |
793c20e9 | 1488 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1489 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1490 | entry->tx_hdr = hdr; | |
fce8a7bb | 1491 | |
282a2fee | 1492 | iowrite32(entry->len, &hdr->len); |
e26a5843 | 1493 | iowrite32((u32)qp->tx_pkts, &hdr->ver); |
282a2fee JM |
1494 | |
1495 | if (!chan) | |
1496 | goto err; | |
1497 | ||
1498 | if (len < copy_bytes) | |
1499 | goto err; | |
1500 | ||
1501 | device = chan->device; | |
1502 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
e26a5843 AH |
1503 | buff_off = (size_t)buf & ~PAGE_MASK; |
1504 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1505 | |
1506 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1507 | goto err; | |
1508 | ||
6f57fd05 BZ |
1509 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1510 | if (!unmap) | |
282a2fee JM |
1511 | goto err; |
1512 | ||
6f57fd05 BZ |
1513 | unmap->len = len; |
1514 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1515 | buff_off, len, DMA_TO_DEVICE); | |
1516 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1517 | goto err_get_unmap; | |
1518 | ||
1519 | unmap->to_cnt = 1; | |
1520 | ||
8c874cc1 DJ |
1521 | for (retries = 0; retries < DMA_RETRIES; retries++) { |
1522 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], | |
1523 | len, DMA_PREP_INTERRUPT); | |
1524 | if (txd) | |
1525 | break; | |
1526 | ||
1527 | set_current_state(TASK_INTERRUPTIBLE); | |
1528 | schedule_timeout(DMA_OUT_RESOURCE_TO); | |
1529 | } | |
1530 | ||
1531 | if (!txd) { | |
1532 | qp->dma_tx_prep_err++; | |
6f57fd05 | 1533 | goto err_get_unmap; |
8c874cc1 | 1534 | } |
282a2fee JM |
1535 | |
1536 | txd->callback = ntb_tx_copy_callback; | |
1537 | txd->callback_param = entry; | |
6f57fd05 | 1538 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1539 | |
1540 | cookie = dmaengine_submit(txd); | |
1541 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1542 | goto err_set_unmap; |
1543 | ||
1544 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1545 | |
1546 | dma_async_issue_pending(chan); | |
1547 | qp->tx_async++; | |
1548 | ||
1549 | return; | |
6f57fd05 BZ |
1550 | err_set_unmap: |
1551 | dmaengine_unmap_put(unmap); | |
1552 | err_get_unmap: | |
1553 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1554 | err: |
1555 | ntb_memcpy_tx(entry, offset); | |
1556 | qp->tx_memcpy++; | |
1557 | } | |
1558 | ||
1559 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1560 | struct ntb_queue_entry *entry) | |
1561 | { | |
793c20e9 | 1562 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1563 | qp->tx_ring_full++; |
1564 | return -EAGAIN; | |
1565 | } | |
1566 | ||
ef114ed5 | 1567 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb | 1568 | if (qp->tx_handler) |
179f912a | 1569 | qp->tx_handler(qp, qp->cb_data, NULL, -EIO); |
fce8a7bb JM |
1570 | |
1571 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1572 | &qp->tx_free_q); | |
1573 | return 0; | |
1574 | } | |
1575 | ||
282a2fee | 1576 | ntb_async_tx(qp, entry); |
fce8a7bb | 1577 | |
793c20e9 JM |
1578 | qp->tx_index++; |
1579 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1580 | |
1581 | qp->tx_pkts++; | |
1582 | ||
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1587 | { | |
e26a5843 | 1588 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1589 | struct ntb_queue_entry *entry; |
1590 | int i, rc; | |
1591 | ||
e26a5843 | 1592 | if (!qp->link_is_up) |
fce8a7bb JM |
1593 | return; |
1594 | ||
e22e0b9d | 1595 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1596 | |
1597 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1598 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1599 | if (entry) |
1600 | break; | |
1601 | msleep(100); | |
1602 | } | |
1603 | ||
1604 | if (!entry) | |
1605 | return; | |
1606 | ||
1607 | entry->cb_data = NULL; | |
1608 | entry->buf = NULL; | |
1609 | entry->len = 0; | |
1610 | entry->flags = LINK_DOWN_FLAG; | |
1611 | ||
1612 | rc = ntb_process_tx(qp, entry); | |
1613 | if (rc) | |
1614 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1615 | qp->qp_num); | |
2849b5d7 AH |
1616 | |
1617 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1618 | } |
1619 | ||
1199aa61 AH |
1620 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1621 | { | |
1622 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1623 | } | |
1624 | ||
fce8a7bb JM |
1625 | /** |
1626 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1627 | * @rx_handler: receive callback function | |
1628 | * @tx_handler: transmit callback function | |
1629 | * @event_handler: event callback function | |
1630 | * | |
1631 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1632 | * routine for both transmit and receive. The receive callback routine will be | |
1633 | * used to pass up data when the transport has received it on the queue. The | |
1634 | * transmit callback routine will be called when the transport has completed the | |
1635 | * transmission of the data on the queue and the data is ready to be freed. | |
1636 | * | |
1637 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1638 | */ | |
1639 | struct ntb_transport_qp * | |
e26a5843 | 1640 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1641 | const struct ntb_queue_handlers *handlers) |
1642 | { | |
e26a5843 AH |
1643 | struct ntb_dev *ndev; |
1644 | struct pci_dev *pdev; | |
1645 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1646 | struct ntb_queue_entry *entry; |
1647 | struct ntb_transport_qp *qp; | |
e26a5843 | 1648 | u64 qp_bit; |
fce8a7bb | 1649 | unsigned int free_queue; |
1199aa61 AH |
1650 | dma_cap_mask_t dma_mask; |
1651 | int node; | |
e26a5843 | 1652 | int i; |
fce8a7bb | 1653 | |
e26a5843 AH |
1654 | ndev = dev_ntb(client_dev->parent); |
1655 | pdev = ndev->pdev; | |
1656 | nt = ndev->ctx; | |
fce8a7bb | 1657 | |
1199aa61 AH |
1658 | node = dev_to_node(&ndev->dev); |
1659 | ||
fce8a7bb JM |
1660 | free_queue = ffs(nt->qp_bitmap); |
1661 | if (!free_queue) | |
1662 | goto err; | |
1663 | ||
1664 | /* decrement free_queue to make it zero based */ | |
1665 | free_queue--; | |
1666 | ||
e26a5843 AH |
1667 | qp = &nt->qp_vec[free_queue]; |
1668 | qp_bit = BIT_ULL(qp->qp_num); | |
1669 | ||
1670 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1671 | |
fce8a7bb JM |
1672 | qp->cb_data = data; |
1673 | qp->rx_handler = handlers->rx_handler; | |
1674 | qp->tx_handler = handlers->tx_handler; | |
1675 | qp->event_handler = handlers->event_handler; | |
1676 | ||
1199aa61 AH |
1677 | dma_cap_zero(dma_mask); |
1678 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1679 | ||
a41ef053 | 1680 | if (use_dma) { |
569410ca DJ |
1681 | qp->tx_dma_chan = |
1682 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1683 | (void *)(unsigned long)node); | |
1684 | if (!qp->tx_dma_chan) | |
1685 | dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n"); | |
1686 | ||
1687 | qp->rx_dma_chan = | |
1688 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1689 | (void *)(unsigned long)node); | |
1690 | if (!qp->rx_dma_chan) | |
1691 | dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n"); | |
a41ef053 | 1692 | } else { |
569410ca DJ |
1693 | qp->tx_dma_chan = NULL; |
1694 | qp->rx_dma_chan = NULL; | |
a41ef053 | 1695 | } |
569410ca DJ |
1696 | |
1697 | dev_dbg(&pdev->dev, "Using %s memcpy for TX\n", | |
1698 | qp->tx_dma_chan ? "DMA" : "CPU"); | |
1699 | ||
1700 | dev_dbg(&pdev->dev, "Using %s memcpy for RX\n", | |
1701 | qp->rx_dma_chan ? "DMA" : "CPU"); | |
282a2fee | 1702 | |
fce8a7bb | 1703 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1704 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1705 | if (!entry) |
1706 | goto err1; | |
1707 | ||
282a2fee | 1708 | entry->qp = qp; |
da2e5ae5 | 1709 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
f766755c | 1710 | &qp->rx_free_q); |
fce8a7bb JM |
1711 | } |
1712 | ||
1713 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1199aa61 | 1714 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1715 | if (!entry) |
1716 | goto err2; | |
1717 | ||
282a2fee | 1718 | entry->qp = qp; |
fce8a7bb | 1719 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1720 | &qp->tx_free_q); |
fce8a7bb JM |
1721 | } |
1722 | ||
e26a5843 AH |
1723 | ntb_db_clear(qp->ndev, qp_bit); |
1724 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1725 | |
1726 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1727 | ||
1728 | return qp; | |
1729 | ||
fce8a7bb | 1730 | err2: |
f766755c | 1731 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1732 | kfree(entry); |
1733 | err1: | |
da2e5ae5 | 1734 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1735 | kfree(entry); |
569410ca DJ |
1736 | if (qp->tx_dma_chan) |
1737 | dma_release_channel(qp->tx_dma_chan); | |
1738 | if (qp->rx_dma_chan) | |
1739 | dma_release_channel(qp->rx_dma_chan); | |
e26a5843 | 1740 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1741 | err: |
1742 | return NULL; | |
1743 | } | |
1744 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1745 | ||
1746 | /** | |
1747 | * ntb_transport_free_queue - Frees NTB transport queue | |
1748 | * @qp: NTB queue to be freed | |
1749 | * | |
1750 | * Frees NTB transport queue | |
1751 | */ | |
1752 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1753 | { | |
186f27ff | 1754 | struct pci_dev *pdev; |
fce8a7bb | 1755 | struct ntb_queue_entry *entry; |
e26a5843 | 1756 | u64 qp_bit; |
fce8a7bb JM |
1757 | |
1758 | if (!qp) | |
1759 | return; | |
1760 | ||
e26a5843 | 1761 | pdev = qp->ndev->pdev; |
186f27ff | 1762 | |
569410ca DJ |
1763 | if (qp->tx_dma_chan) { |
1764 | struct dma_chan *chan = qp->tx_dma_chan; | |
1765 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1766 | * processed by the CPU instead of the DAM engine | |
1767 | */ | |
1768 | qp->tx_dma_chan = NULL; | |
1769 | ||
1770 | /* Try to be nice and wait for any queued DMA engine | |
1771 | * transactions to process before smashing it with a rock | |
1772 | */ | |
1773 | dma_sync_wait(chan, qp->last_cookie); | |
1774 | dmaengine_terminate_all(chan); | |
1775 | dma_release_channel(chan); | |
1776 | } | |
1777 | ||
1778 | if (qp->rx_dma_chan) { | |
1779 | struct dma_chan *chan = qp->rx_dma_chan; | |
282a2fee JM |
1780 | /* Putting the dma_chan to NULL will force any new traffic to be |
1781 | * processed by the CPU instead of the DAM engine | |
1782 | */ | |
569410ca | 1783 | qp->rx_dma_chan = NULL; |
282a2fee JM |
1784 | |
1785 | /* Try to be nice and wait for any queued DMA engine | |
1786 | * transactions to process before smashing it with a rock | |
1787 | */ | |
1788 | dma_sync_wait(chan, qp->last_cookie); | |
1789 | dmaengine_terminate_all(chan); | |
1199aa61 | 1790 | dma_release_channel(chan); |
282a2fee | 1791 | } |
fce8a7bb | 1792 | |
e26a5843 AH |
1793 | qp_bit = BIT_ULL(qp->qp_num); |
1794 | ||
1795 | ntb_db_set_mask(qp->ndev, qp_bit); | |
1796 | tasklet_disable(&qp->rxc_db_work); | |
fce8a7bb | 1797 | |
282a2fee JM |
1798 | cancel_delayed_work_sync(&qp->link_work); |
1799 | ||
e26a5843 AH |
1800 | qp->cb_data = NULL; |
1801 | qp->rx_handler = NULL; | |
1802 | qp->tx_handler = NULL; | |
1803 | qp->event_handler = NULL; | |
1804 | ||
da2e5ae5 | 1805 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1806 | kfree(entry); |
1807 | ||
da2e5ae5 AH |
1808 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) { |
1809 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n"); | |
1810 | kfree(entry); | |
1811 | } | |
1812 | ||
1813 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) { | |
1814 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n"); | |
fce8a7bb JM |
1815 | kfree(entry); |
1816 | } | |
1817 | ||
f766755c | 1818 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1819 | kfree(entry); |
1820 | ||
30a4bb1e | 1821 | qp->transport->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1822 | |
1823 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1824 | } | |
1825 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1826 | ||
1827 | /** | |
1828 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1829 | * @qp: NTB queue to be freed | |
1830 | * @len: pointer to variable to write enqueued buffers length | |
1831 | * | |
1832 | * Dequeues unused buffers from receive queue. Should only be used during | |
1833 | * shutdown of qp. | |
1834 | * | |
1835 | * RETURNS: NULL error value on error, or void* for success. | |
1836 | */ | |
1837 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1838 | { | |
1839 | struct ntb_queue_entry *entry; | |
1840 | void *buf; | |
1841 | ||
e26a5843 | 1842 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1843 | return NULL; |
1844 | ||
da2e5ae5 | 1845 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q); |
fce8a7bb JM |
1846 | if (!entry) |
1847 | return NULL; | |
1848 | ||
1849 | buf = entry->cb_data; | |
1850 | *len = entry->len; | |
1851 | ||
da2e5ae5 | 1852 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1853 | |
1854 | return buf; | |
1855 | } | |
1856 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1857 | ||
1858 | /** | |
1859 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1860 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1861 | * @cb: per buffer pointer for callback function to use | |
1862 | * @data: pointer to data buffer that incoming packets will be copied into | |
1863 | * @len: length of the data buffer | |
1864 | * | |
1865 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1866 | * payload can be received into. | |
1867 | * | |
1868 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1869 | */ | |
1870 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1871 | unsigned int len) | |
1872 | { | |
1873 | struct ntb_queue_entry *entry; | |
1874 | ||
1875 | if (!qp) | |
1876 | return -EINVAL; | |
1877 | ||
da2e5ae5 | 1878 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q); |
fce8a7bb JM |
1879 | if (!entry) |
1880 | return -ENOMEM; | |
1881 | ||
1882 | entry->cb_data = cb; | |
1883 | entry->buf = data; | |
1884 | entry->len = len; | |
da2e5ae5 AH |
1885 | entry->flags = 0; |
1886 | ||
1887 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q); | |
fce8a7bb | 1888 | |
da2e5ae5 | 1889 | tasklet_schedule(&qp->rxc_db_work); |
fce8a7bb JM |
1890 | |
1891 | return 0; | |
1892 | } | |
1893 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1894 | ||
1895 | /** | |
1896 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1897 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1898 | * @cb: per buffer pointer for callback function to use | |
1899 | * @data: pointer to data buffer that will be sent | |
1900 | * @len: length of the data buffer | |
1901 | * | |
1902 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1903 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1904 | * serialize access to the qp. |
1905 | * | |
1906 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1907 | */ | |
1908 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1909 | unsigned int len) | |
1910 | { | |
1911 | struct ntb_queue_entry *entry; | |
1912 | int rc; | |
1913 | ||
e26a5843 | 1914 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
1915 | return -EINVAL; |
1916 | ||
1917 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1918 | if (!entry) { |
1919 | qp->tx_err_no_buf++; | |
e74bfeed | 1920 | return -EBUSY; |
282a2fee | 1921 | } |
fce8a7bb JM |
1922 | |
1923 | entry->cb_data = cb; | |
1924 | entry->buf = data; | |
1925 | entry->len = len; | |
1926 | entry->flags = 0; | |
1927 | ||
1928 | rc = ntb_process_tx(qp, entry); | |
1929 | if (rc) | |
1930 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1931 | &qp->tx_free_q); | |
1932 | ||
1933 | return rc; | |
1934 | } | |
1935 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1936 | ||
1937 | /** | |
1938 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1939 | * @qp: NTB transport layer queue to be enabled | |
1940 | * | |
1941 | * Notify NTB transport layer of client readiness to use queue | |
1942 | */ | |
1943 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1944 | { | |
1945 | if (!qp) | |
1946 | return; | |
1947 | ||
e26a5843 | 1948 | qp->client_ready = true; |
fce8a7bb | 1949 | |
e26a5843 | 1950 | if (qp->transport->link_is_up) |
fce8a7bb JM |
1951 | schedule_delayed_work(&qp->link_work, 0); |
1952 | } | |
1953 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1954 | ||
1955 | /** | |
1956 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1957 | * @qp: NTB transport layer queue to be disabled | |
1958 | * | |
1959 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1960 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1961 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1962 | */ |
1963 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1964 | { | |
e26a5843 | 1965 | int val; |
fce8a7bb JM |
1966 | |
1967 | if (!qp) | |
1968 | return; | |
1969 | ||
e26a5843 | 1970 | qp->client_ready = false; |
fce8a7bb | 1971 | |
e26a5843 | 1972 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 1973 | |
e26a5843 AH |
1974 | ntb_peer_spad_write(qp->ndev, QP_LINKS, |
1975 | val & ~BIT(qp->qp_num)); | |
fce8a7bb | 1976 | |
e26a5843 | 1977 | if (qp->link_is_up) |
fce8a7bb JM |
1978 | ntb_send_link_down(qp); |
1979 | else | |
1980 | cancel_delayed_work_sync(&qp->link_work); | |
1981 | } | |
1982 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1983 | ||
1984 | /** | |
1985 | * ntb_transport_link_query - Query transport link state | |
1986 | * @qp: NTB transport layer queue to be queried | |
1987 | * | |
1988 | * Query connectivity to the remote system of the NTB transport queue | |
1989 | * | |
1990 | * RETURNS: true for link up or false for link down | |
1991 | */ | |
1992 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1993 | { | |
186f27ff JM |
1994 | if (!qp) |
1995 | return false; | |
1996 | ||
e26a5843 | 1997 | return qp->link_is_up; |
fce8a7bb JM |
1998 | } |
1999 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
2000 | ||
2001 | /** | |
2002 | * ntb_transport_qp_num - Query the qp number | |
2003 | * @qp: NTB transport layer queue to be queried | |
2004 | * | |
2005 | * Query qp number of the NTB transport queue | |
2006 | * | |
2007 | * RETURNS: a zero based number specifying the qp number | |
2008 | */ | |
2009 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
2010 | { | |
186f27ff JM |
2011 | if (!qp) |
2012 | return 0; | |
2013 | ||
fce8a7bb JM |
2014 | return qp->qp_num; |
2015 | } | |
2016 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
2017 | ||
2018 | /** | |
2019 | * ntb_transport_max_size - Query the max payload size of a qp | |
2020 | * @qp: NTB transport layer queue to be queried | |
2021 | * | |
2022 | * Query the maximum payload size permissible on the given qp | |
2023 | * | |
2024 | * RETURNS: the max payload size of a qp | |
2025 | */ | |
ef114ed5 | 2026 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 2027 | { |
04afde45 | 2028 | unsigned int max_size; |
569410ca | 2029 | unsigned int copy_align; |
04afde45 | 2030 | struct dma_chan *rx_chan, *tx_chan; |
282a2fee | 2031 | |
186f27ff JM |
2032 | if (!qp) |
2033 | return 0; | |
2034 | ||
04afde45 DJ |
2035 | rx_chan = qp->rx_dma_chan; |
2036 | tx_chan = qp->tx_dma_chan; | |
282a2fee | 2037 | |
04afde45 DJ |
2038 | copy_align = max(rx_chan ? rx_chan->device->copy_align : 0, |
2039 | tx_chan ? tx_chan->device->copy_align : 0); | |
569410ca | 2040 | |
282a2fee | 2041 | /* If DMA engine usage is possible, try to find the max size for that */ |
04afde45 DJ |
2042 | max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header); |
2043 | max_size = round_down(max_size, 1 << copy_align); | |
282a2fee | 2044 | |
04afde45 | 2045 | return max_size; |
fce8a7bb JM |
2046 | } |
2047 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 | 2048 | |
e74bfeed DJ |
2049 | unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp) |
2050 | { | |
2051 | unsigned int head = qp->tx_index; | |
2052 | unsigned int tail = qp->remote_rx_info->entry; | |
2053 | ||
2054 | return tail > head ? tail - head : qp->tx_max_entry + tail - head; | |
2055 | } | |
2056 | EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry); | |
2057 | ||
e26a5843 AH |
2058 | static void ntb_transport_doorbell_callback(void *data, int vector) |
2059 | { | |
2060 | struct ntb_transport_ctx *nt = data; | |
2061 | struct ntb_transport_qp *qp; | |
2062 | u64 db_bits; | |
2063 | unsigned int qp_num; | |
2064 | ||
2065 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
2066 | ntb_db_vector_mask(nt->ndev, vector)); | |
2067 | ||
2068 | while (db_bits) { | |
2069 | qp_num = __ffs(db_bits); | |
2070 | qp = &nt->qp_vec[qp_num]; | |
2071 | ||
2072 | tasklet_schedule(&qp->rxc_db_work); | |
2073 | ||
2074 | db_bits &= ~BIT_ULL(qp_num); | |
2075 | } | |
2076 | } | |
2077 | ||
2078 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
2079 | .link_event = ntb_transport_event_callback, | |
2080 | .db_event = ntb_transport_doorbell_callback, | |
2081 | }; | |
2082 | ||
2083 | static struct ntb_client ntb_transport_client = { | |
2084 | .ops = { | |
2085 | .probe = ntb_transport_probe, | |
2086 | .remove = ntb_transport_free, | |
2087 | }, | |
2088 | }; | |
2089 | ||
2090 | static int __init ntb_transport_init(void) | |
2091 | { | |
2092 | int rc; | |
2093 | ||
7eb38781 DJ |
2094 | pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
2095 | ||
e26a5843 AH |
2096 | if (debugfs_initialized()) |
2097 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
2098 | ||
2099 | rc = bus_register(&ntb_transport_bus); | |
2100 | if (rc) | |
2101 | goto err_bus; | |
2102 | ||
2103 | rc = ntb_register_client(&ntb_transport_client); | |
2104 | if (rc) | |
2105 | goto err_client; | |
2106 | ||
2107 | return 0; | |
2108 | ||
2109 | err_client: | |
2110 | bus_unregister(&ntb_transport_bus); | |
2111 | err_bus: | |
2112 | debugfs_remove_recursive(nt_debugfs_dir); | |
2113 | return rc; | |
2114 | } | |
2115 | module_init(ntb_transport_init); | |
2116 | ||
2117 | static void __exit ntb_transport_exit(void) | |
2118 | { | |
2119 | debugfs_remove_recursive(nt_debugfs_dir); | |
2120 | ||
2121 | ntb_unregister_client(&ntb_transport_client); | |
2122 | bus_unregister(&ntb_transport_bus); | |
2123 | } | |
2124 | module_exit(ntb_transport_exit); |