]>
Commit | Line | Data |
---|---|---|
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; | |
9cabc269 DJ |
105 | int retries; |
106 | int errors; | |
107 | unsigned int tx_index; | |
72203572 | 108 | unsigned int rx_index; |
282a2fee JM |
109 | |
110 | struct ntb_transport_qp *qp; | |
111 | union { | |
112 | struct ntb_payload_header __iomem *tx_hdr; | |
113 | struct ntb_payload_header *rx_hdr; | |
114 | }; | |
fce8a7bb JM |
115 | }; |
116 | ||
793c20e9 JM |
117 | struct ntb_rx_info { |
118 | unsigned int entry; | |
119 | }; | |
120 | ||
fce8a7bb | 121 | struct ntb_transport_qp { |
e26a5843 AH |
122 | struct ntb_transport_ctx *transport; |
123 | struct ntb_dev *ndev; | |
fce8a7bb | 124 | void *cb_data; |
569410ca DJ |
125 | struct dma_chan *tx_dma_chan; |
126 | struct dma_chan *rx_dma_chan; | |
fce8a7bb JM |
127 | |
128 | bool client_ready; | |
e26a5843 | 129 | bool link_is_up; |
e9021331 | 130 | bool active; |
e26a5843 | 131 | |
fce8a7bb | 132 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 133 | u64 qp_bit; |
fce8a7bb | 134 | |
74465645 | 135 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
136 | struct ntb_rx_info *remote_rx_info; |
137 | ||
53ca4fea JM |
138 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
139 | void *data, int len); | |
fce8a7bb JM |
140 | struct list_head tx_free_q; |
141 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 142 | void __iomem *tx_mw; |
282a2fee | 143 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
144 | unsigned int tx_index; |
145 | unsigned int tx_max_entry; | |
ef114ed5 | 146 | unsigned int tx_max_frame; |
fce8a7bb | 147 | |
53ca4fea JM |
148 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
149 | void *data, int len); | |
da2e5ae5 | 150 | struct list_head rx_post_q; |
fce8a7bb JM |
151 | struct list_head rx_pend_q; |
152 | struct list_head rx_free_q; | |
da2e5ae5 AH |
153 | /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */ |
154 | spinlock_t ntb_rx_q_lock; | |
793c20e9 JM |
155 | void *rx_buff; |
156 | unsigned int rx_index; | |
157 | unsigned int rx_max_entry; | |
ef114ed5 | 158 | unsigned int rx_max_frame; |
a754a8fc | 159 | unsigned int rx_alloc_entry; |
282a2fee | 160 | dma_cookie_t last_cookie; |
e26a5843 | 161 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 162 | |
53ca4fea | 163 | void (*event_handler)(void *data, int status); |
fce8a7bb | 164 | struct delayed_work link_work; |
7b4f2d3c | 165 | struct work_struct link_cleanup; |
fce8a7bb JM |
166 | |
167 | struct dentry *debugfs_dir; | |
168 | struct dentry *debugfs_stats; | |
169 | ||
170 | /* Stats */ | |
171 | u64 rx_bytes; | |
172 | u64 rx_pkts; | |
173 | u64 rx_ring_empty; | |
174 | u64 rx_err_no_buf; | |
175 | u64 rx_err_oflow; | |
176 | u64 rx_err_ver; | |
282a2fee JM |
177 | u64 rx_memcpy; |
178 | u64 rx_async; | |
8c874cc1 | 179 | u64 dma_rx_prep_err; |
fce8a7bb JM |
180 | u64 tx_bytes; |
181 | u64 tx_pkts; | |
182 | u64 tx_ring_full; | |
282a2fee JM |
183 | u64 tx_err_no_buf; |
184 | u64 tx_memcpy; | |
185 | u64 tx_async; | |
8c874cc1 | 186 | u64 dma_tx_prep_err; |
fce8a7bb JM |
187 | }; |
188 | ||
189 | struct ntb_transport_mw { | |
e26a5843 AH |
190 | phys_addr_t phys_addr; |
191 | resource_size_t phys_size; | |
192 | resource_size_t xlat_align; | |
193 | resource_size_t xlat_align_size; | |
194 | void __iomem *vbase; | |
195 | size_t xlat_size; | |
196 | size_t buff_size; | |
fce8a7bb JM |
197 | void *virt_addr; |
198 | dma_addr_t dma_addr; | |
199 | }; | |
200 | ||
201 | struct ntb_transport_client_dev { | |
202 | struct list_head entry; | |
e26a5843 | 203 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
204 | struct device dev; |
205 | }; | |
206 | ||
e26a5843 | 207 | struct ntb_transport_ctx { |
fce8a7bb JM |
208 | struct list_head entry; |
209 | struct list_head client_devs; | |
210 | ||
e26a5843 AH |
211 | struct ntb_dev *ndev; |
212 | ||
213 | struct ntb_transport_mw *mw_vec; | |
214 | struct ntb_transport_qp *qp_vec; | |
215 | unsigned int mw_count; | |
216 | unsigned int qp_count; | |
217 | u64 qp_bitmap; | |
218 | u64 qp_bitmap_free; | |
219 | ||
220 | bool link_is_up; | |
fce8a7bb | 221 | struct delayed_work link_work; |
7b4f2d3c | 222 | struct work_struct link_cleanup; |
c8650fd0 DJ |
223 | |
224 | struct dentry *debugfs_node_dir; | |
fce8a7bb JM |
225 | }; |
226 | ||
227 | enum { | |
e26a5843 AH |
228 | DESC_DONE_FLAG = BIT(0), |
229 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
230 | }; |
231 | ||
232 | struct ntb_payload_header { | |
74465645 | 233 | unsigned int ver; |
fce8a7bb JM |
234 | unsigned int len; |
235 | unsigned int flags; | |
236 | }; | |
237 | ||
238 | enum { | |
239 | VERSION = 0, | |
fce8a7bb | 240 | QP_LINKS, |
113fc505 JM |
241 | NUM_QPS, |
242 | NUM_MWS, | |
243 | MW0_SZ_HIGH, | |
244 | MW0_SZ_LOW, | |
245 | MW1_SZ_HIGH, | |
246 | MW1_SZ_LOW, | |
fce8a7bb JM |
247 | MAX_SPAD, |
248 | }; | |
249 | ||
e26a5843 AH |
250 | #define dev_client_dev(__dev) \ |
251 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
252 | ||
253 | #define drv_client(__drv) \ | |
254 | container_of((__drv), struct ntb_transport_client, driver) | |
255 | ||
256 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
257 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
258 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
8c874cc1 DJ |
259 | #define DMA_RETRIES 20 |
260 | #define DMA_OUT_RESOURCE_TO 50 | |
fce8a7bb | 261 | |
e26a5843 AH |
262 | static void ntb_transport_rxc_db(unsigned long data); |
263 | static const struct ntb_ctx_ops ntb_transport_ops; | |
264 | static struct ntb_client ntb_transport_client; | |
9cabc269 DJ |
265 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
266 | struct ntb_queue_entry *entry); | |
267 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset); | |
72203572 DJ |
268 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset); |
269 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset); | |
270 | ||
e26a5843 AH |
271 | |
272 | static int ntb_transport_bus_match(struct device *dev, | |
273 | struct device_driver *drv) | |
fce8a7bb JM |
274 | { |
275 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
276 | } | |
277 | ||
e26a5843 | 278 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 279 | { |
e26a5843 | 280 | const struct ntb_transport_client *client; |
fce8a7bb JM |
281 | int rc = -EINVAL; |
282 | ||
283 | get_device(dev); | |
e26a5843 AH |
284 | |
285 | client = drv_client(dev->driver); | |
286 | rc = client->probe(dev); | |
fce8a7bb JM |
287 | if (rc) |
288 | put_device(dev); | |
289 | ||
290 | return rc; | |
291 | } | |
292 | ||
e26a5843 | 293 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 294 | { |
e26a5843 | 295 | const struct ntb_transport_client *client; |
fce8a7bb | 296 | |
e26a5843 AH |
297 | client = drv_client(dev->driver); |
298 | client->remove(dev); | |
fce8a7bb JM |
299 | |
300 | put_device(dev); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
e26a5843 AH |
305 | static struct bus_type ntb_transport_bus = { |
306 | .name = "ntb_transport", | |
307 | .match = ntb_transport_bus_match, | |
308 | .probe = ntb_transport_bus_probe, | |
309 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
310 | }; |
311 | ||
312 | static LIST_HEAD(ntb_transport_list); | |
313 | ||
e26a5843 | 314 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 315 | { |
31510000 | 316 | list_add_tail(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
317 | return 0; |
318 | } | |
319 | ||
e26a5843 | 320 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
321 | { |
322 | struct ntb_transport_client_dev *client_dev, *cd; | |
323 | ||
324 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
325 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
326 | dev_name(&client_dev->dev)); | |
327 | list_del(&client_dev->entry); | |
328 | device_unregister(&client_dev->dev); | |
329 | } | |
330 | ||
331 | list_del(&nt->entry); | |
fce8a7bb JM |
332 | } |
333 | ||
e26a5843 | 334 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
335 | { |
336 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 337 | |
e26a5843 | 338 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
339 | kfree(client_dev); |
340 | } | |
341 | ||
342 | /** | |
e26a5843 | 343 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
344 | * @device_name: Name of NTB client device |
345 | * | |
346 | * Unregister an NTB client device with the NTB transport layer | |
347 | */ | |
e26a5843 | 348 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
349 | { |
350 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 351 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
352 | |
353 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
354 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
355 | if (!strncmp(dev_name(&client->dev), device_name, | |
356 | strlen(device_name))) { | |
357 | list_del(&client->entry); | |
358 | device_unregister(&client->dev); | |
359 | } | |
360 | } | |
e26a5843 | 361 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
362 | |
363 | /** | |
e26a5843 | 364 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
365 | * @device_name: Name of NTB client device |
366 | * | |
367 | * Register an NTB client device with the NTB transport layer | |
368 | */ | |
e26a5843 | 369 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
370 | { |
371 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 372 | struct ntb_transport_ctx *nt; |
1199aa61 | 373 | int node; |
8b19d450 | 374 | int rc, i = 0; |
fce8a7bb | 375 | |
8222b402 JM |
376 | if (list_empty(&ntb_transport_list)) |
377 | return -ENODEV; | |
378 | ||
fce8a7bb JM |
379 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
380 | struct device *dev; | |
381 | ||
1199aa61 AH |
382 | node = dev_to_node(&nt->ndev->dev); |
383 | ||
384 | client_dev = kzalloc_node(sizeof(*client_dev), | |
385 | GFP_KERNEL, node); | |
fce8a7bb JM |
386 | if (!client_dev) { |
387 | rc = -ENOMEM; | |
388 | goto err; | |
389 | } | |
390 | ||
391 | dev = &client_dev->dev; | |
392 | ||
393 | /* setup and register client devices */ | |
8b19d450 | 394 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
395 | dev->bus = &ntb_transport_bus; |
396 | dev->release = ntb_transport_client_release; | |
397 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
398 | |
399 | rc = device_register(dev); | |
400 | if (rc) { | |
401 | kfree(client_dev); | |
402 | goto err; | |
403 | } | |
404 | ||
405 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 406 | i++; |
fce8a7bb JM |
407 | } |
408 | ||
409 | return 0; | |
410 | ||
411 | err: | |
e26a5843 | 412 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
413 | |
414 | return rc; | |
415 | } | |
e26a5843 | 416 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
417 | |
418 | /** | |
ec110bc7 | 419 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
420 | * @drv: NTB client driver to be registered |
421 | * | |
422 | * Register 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 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 427 | { |
e26a5843 | 428 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 429 | |
8222b402 JM |
430 | if (list_empty(&ntb_transport_list)) |
431 | return -ENODEV; | |
432 | ||
fce8a7bb JM |
433 | return driver_register(&drv->driver); |
434 | } | |
ec110bc7 | 435 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
436 | |
437 | /** | |
ec110bc7 | 438 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
439 | * @drv: NTB client driver to be unregistered |
440 | * | |
441 | * Unregister an NTB client driver with the NTB transport layer | |
442 | * | |
443 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
444 | */ | |
e26a5843 | 445 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
446 | { |
447 | driver_unregister(&drv->driver); | |
448 | } | |
ec110bc7 | 449 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 450 | |
fce8a7bb JM |
451 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
452 | loff_t *offp) | |
453 | { | |
454 | struct ntb_transport_qp *qp; | |
d7237e22 | 455 | char *buf; |
fce8a7bb JM |
456 | ssize_t ret, out_offset, out_count; |
457 | ||
260bee94 DJ |
458 | qp = filp->private_data; |
459 | ||
460 | if (!qp || !qp->link_is_up) | |
461 | return 0; | |
462 | ||
282a2fee | 463 | out_count = 1000; |
d7237e22 JM |
464 | |
465 | buf = kmalloc(out_count, GFP_KERNEL); | |
466 | if (!buf) | |
467 | return -ENOMEM; | |
fce8a7bb | 468 | |
fce8a7bb JM |
469 | out_offset = 0; |
470 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 471 | "\nNTB QP stats:\n\n"); |
fce8a7bb JM |
472 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
473 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
474 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
475 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
476 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
477 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
478 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
479 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
480 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
481 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
482 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
483 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
484 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
485 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
486 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
487 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
488 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 489 | "rx_buff - \t0x%p\n", qp->rx_buff); |
fce8a7bb | 490 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 491 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 492 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
a754a8fc DJ |
493 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
494 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
495 | "rx_alloc_entry - \t%u\n\n", qp->rx_alloc_entry); | |
fce8a7bb JM |
496 | |
497 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
498 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
499 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
500 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
501 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
502 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
503 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
504 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
505 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
506 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
507 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
508 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 509 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 510 | "tx_mw - \t0x%p\n", qp->tx_mw); |
fce8a7bb | 511 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 512 | "tx_index (H) - \t%u\n", qp->tx_index); |
fce8a7bb | 513 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 514 | "RRI (T) - \t%u\n", |
e74bfeed | 515 | qp->remote_rx_info->entry); |
d98ef99e DJ |
516 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
517 | "tx_max_entry - \t%u\n", qp->tx_max_entry); | |
e74bfeed DJ |
518 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
519 | "free tx - \t%u\n", | |
520 | ntb_transport_tx_free_entry(qp)); | |
8c874cc1 DJ |
521 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
522 | "DMA tx prep err - \t%llu\n", | |
523 | qp->dma_tx_prep_err); | |
524 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
525 | "DMA rx prep err - \t%llu\n", | |
526 | qp->dma_rx_prep_err); | |
fce8a7bb JM |
527 | |
528 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e DJ |
529 | "\n"); |
530 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
569410ca DJ |
531 | "Using TX DMA - \t%s\n", |
532 | qp->tx_dma_chan ? "Yes" : "No"); | |
533 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
534 | "Using RX DMA - \t%s\n", | |
535 | qp->rx_dma_chan ? "Yes" : "No"); | |
d98ef99e DJ |
536 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
537 | "QP Link - \t%s\n", | |
e26a5843 | 538 | qp->link_is_up ? "Up" : "Down"); |
d98ef99e DJ |
539 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
540 | "\n"); | |
541 | ||
d7237e22 JM |
542 | if (out_offset > out_count) |
543 | out_offset = out_count; | |
fce8a7bb JM |
544 | |
545 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 546 | kfree(buf); |
fce8a7bb JM |
547 | return ret; |
548 | } | |
549 | ||
550 | static const struct file_operations ntb_qp_debugfs_stats = { | |
551 | .owner = THIS_MODULE, | |
d66d7ac2 | 552 | .open = simple_open, |
fce8a7bb JM |
553 | .read = debugfs_read, |
554 | }; | |
555 | ||
556 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
557 | struct list_head *list) | |
558 | { | |
559 | unsigned long flags; | |
560 | ||
561 | spin_lock_irqsave(lock, flags); | |
562 | list_add_tail(entry, list); | |
563 | spin_unlock_irqrestore(lock, flags); | |
564 | } | |
565 | ||
566 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 567 | struct list_head *list) |
fce8a7bb JM |
568 | { |
569 | struct ntb_queue_entry *entry; | |
570 | unsigned long flags; | |
571 | ||
572 | spin_lock_irqsave(lock, flags); | |
573 | if (list_empty(list)) { | |
574 | entry = NULL; | |
575 | goto out; | |
576 | } | |
577 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
578 | list_del(&entry->entry); | |
e74bfeed | 579 | |
fce8a7bb JM |
580 | out: |
581 | spin_unlock_irqrestore(lock, flags); | |
582 | ||
583 | return entry; | |
584 | } | |
585 | ||
da2e5ae5 AH |
586 | static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock, |
587 | struct list_head *list, | |
588 | struct list_head *to_list) | |
589 | { | |
590 | struct ntb_queue_entry *entry; | |
591 | unsigned long flags; | |
592 | ||
593 | spin_lock_irqsave(lock, flags); | |
594 | ||
595 | if (list_empty(list)) { | |
596 | entry = NULL; | |
597 | } else { | |
598 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
599 | list_move_tail(&entry->entry, to_list); | |
600 | } | |
601 | ||
602 | spin_unlock_irqrestore(lock, flags); | |
603 | ||
604 | return entry; | |
605 | } | |
606 | ||
e26a5843 AH |
607 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
608 | unsigned int qp_num) | |
fce8a7bb | 609 | { |
e26a5843 AH |
610 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
611 | struct ntb_transport_mw *mw; | |
a754a8fc DJ |
612 | struct ntb_dev *ndev = nt->ndev; |
613 | struct ntb_queue_entry *entry; | |
ef114ed5 | 614 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 615 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 616 | unsigned int i; |
a754a8fc | 617 | int node; |
fce8a7bb | 618 | |
e26a5843 AH |
619 | mw_count = nt->mw_count; |
620 | qp_count = nt->qp_count; | |
948d3a65 | 621 | |
e26a5843 AH |
622 | mw_num = QP_TO_MW(nt, qp_num); |
623 | mw = &nt->mw_vec[mw_num]; | |
624 | ||
625 | if (!mw->virt_addr) | |
626 | return -ENOMEM; | |
fce8a7bb | 627 | |
e26a5843 AH |
628 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
629 | num_qps_mw = qp_count / mw_count + 1; | |
fce8a7bb | 630 | else |
e26a5843 | 631 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 632 | |
e26a5843 | 633 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
c92ba3c5 | 634 | qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); |
793c20e9 JM |
635 | rx_size -= sizeof(struct ntb_rx_info); |
636 | ||
282a2fee JM |
637 | qp->remote_rx_info = qp->rx_buff + rx_size; |
638 | ||
c9d534c8 JM |
639 | /* Due to housekeeping, there must be atleast 2 buffs */ |
640 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
641 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
642 | qp->rx_index = 0; | |
643 | ||
a754a8fc DJ |
644 | /* |
645 | * Checking to see if we have more entries than the default. | |
646 | * We should add additional entries if that is the case so we | |
647 | * can be in sync with the transport frames. | |
648 | */ | |
649 | node = dev_to_node(&ndev->dev); | |
650 | for (i = qp->rx_alloc_entry; i < qp->rx_max_entry; i++) { | |
651 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); | |
652 | if (!entry) | |
653 | return -ENOMEM; | |
654 | ||
655 | entry->qp = qp; | |
656 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, | |
657 | &qp->rx_free_q); | |
658 | qp->rx_alloc_entry++; | |
659 | } | |
660 | ||
c9d534c8 | 661 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 662 | |
ef114ed5 | 663 | /* setup the hdr offsets with 0's */ |
793c20e9 | 664 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
665 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
666 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 667 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 668 | } |
fce8a7bb JM |
669 | |
670 | qp->rx_pkts = 0; | |
671 | qp->tx_pkts = 0; | |
90f9e934 | 672 | qp->tx_index = 0; |
e26a5843 AH |
673 | |
674 | return 0; | |
fce8a7bb JM |
675 | } |
676 | ||
e26a5843 | 677 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 678 | { |
e26a5843 AH |
679 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
680 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
681 | |
682 | if (!mw->virt_addr) | |
683 | return; | |
684 | ||
e26a5843 AH |
685 | ntb_mw_clear_trans(nt->ndev, num_mw); |
686 | dma_free_coherent(&pdev->dev, mw->buff_size, | |
687 | mw->virt_addr, mw->dma_addr); | |
688 | mw->xlat_size = 0; | |
689 | mw->buff_size = 0; | |
b77b2637 JM |
690 | mw->virt_addr = NULL; |
691 | } | |
692 | ||
e26a5843 | 693 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
8c9edf63 | 694 | resource_size_t size) |
fce8a7bb | 695 | { |
e26a5843 AH |
696 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
697 | struct pci_dev *pdev = nt->ndev->pdev; | |
8c9edf63 | 698 | size_t xlat_size, buff_size; |
e26a5843 AH |
699 | int rc; |
700 | ||
8c9edf63 AH |
701 | if (!size) |
702 | return -EINVAL; | |
703 | ||
e26a5843 AH |
704 | xlat_size = round_up(size, mw->xlat_align_size); |
705 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 706 | |
b77b2637 | 707 | /* No need to re-setup */ |
e26a5843 | 708 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
709 | return 0; |
710 | ||
e26a5843 | 711 | if (mw->buff_size) |
b77b2637 JM |
712 | ntb_free_mw(nt, num_mw); |
713 | ||
e26a5843 AH |
714 | /* Alloc memory for receiving data. Must be aligned */ |
715 | mw->xlat_size = xlat_size; | |
716 | mw->buff_size = buff_size; | |
fce8a7bb | 717 | |
e26a5843 AH |
718 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
719 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 720 | if (!mw->virt_addr) { |
e26a5843 AH |
721 | mw->xlat_size = 0; |
722 | mw->buff_size = 0; | |
8c9edf63 | 723 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %zu\n", |
e26a5843 | 724 | buff_size); |
fce8a7bb JM |
725 | return -ENOMEM; |
726 | } | |
727 | ||
3cc5ba19 DJ |
728 | /* |
729 | * we must ensure that the memory address allocated is BAR size | |
730 | * aligned in order for the XLAT register to take the value. This | |
731 | * is a requirement of the hardware. It is recommended to setup CMA | |
732 | * for BAR sizes equal or greater than 4MB. | |
733 | */ | |
e26a5843 AH |
734 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
735 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
736 | &mw->dma_addr); |
737 | ntb_free_mw(nt, num_mw); | |
738 | return -ENOMEM; | |
739 | } | |
740 | ||
fce8a7bb | 741 | /* Notify HW the memory location of the receive buffer */ |
e26a5843 AH |
742 | rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
743 | if (rc) { | |
744 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
745 | ntb_free_mw(nt, num_mw); | |
746 | return -EIO; | |
747 | } | |
fce8a7bb JM |
748 | |
749 | return 0; | |
750 | } | |
751 | ||
2849b5d7 AH |
752 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
753 | { | |
754 | qp->link_is_up = false; | |
e9021331 | 755 | qp->active = false; |
2849b5d7 AH |
756 | |
757 | qp->tx_index = 0; | |
758 | qp->rx_index = 0; | |
759 | qp->rx_bytes = 0; | |
760 | qp->rx_pkts = 0; | |
761 | qp->rx_ring_empty = 0; | |
762 | qp->rx_err_no_buf = 0; | |
763 | qp->rx_err_oflow = 0; | |
764 | qp->rx_err_ver = 0; | |
765 | qp->rx_memcpy = 0; | |
766 | qp->rx_async = 0; | |
767 | qp->tx_bytes = 0; | |
768 | qp->tx_pkts = 0; | |
769 | qp->tx_ring_full = 0; | |
770 | qp->tx_err_no_buf = 0; | |
771 | qp->tx_memcpy = 0; | |
772 | qp->tx_async = 0; | |
8c874cc1 DJ |
773 | qp->dma_tx_prep_err = 0; |
774 | qp->dma_rx_prep_err = 0; | |
2849b5d7 AH |
775 | } |
776 | ||
fca4d518 | 777 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 778 | { |
e26a5843 AH |
779 | struct ntb_transport_ctx *nt = qp->transport; |
780 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 781 | |
e22e0b9d | 782 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
783 | |
784 | cancel_delayed_work_sync(&qp->link_work); | |
785 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
786 | |
787 | if (qp->event_handler) | |
788 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
789 | } |
790 | ||
791 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
792 | { | |
793 | struct ntb_transport_qp *qp = container_of(work, | |
794 | struct ntb_transport_qp, | |
795 | link_cleanup); | |
e26a5843 | 796 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
797 | |
798 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 799 | |
e26a5843 | 800 | if (nt->link_is_up) |
fce8a7bb JM |
801 | schedule_delayed_work(&qp->link_work, |
802 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
803 | } | |
804 | ||
7b4f2d3c JM |
805 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
806 | { | |
807 | schedule_work(&qp->link_cleanup); | |
808 | } | |
809 | ||
e26a5843 | 810 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 811 | { |
e26a5843 AH |
812 | struct ntb_transport_qp *qp; |
813 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
814 | int i; |
815 | ||
e26a5843 AH |
816 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
817 | ||
fca4d518 | 818 | /* Pass along the info to any clients */ |
e26a5843 AH |
819 | for (i = 0; i < nt->qp_count; i++) |
820 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
821 | qp = &nt->qp_vec[i]; | |
822 | ntb_qp_link_cleanup(qp); | |
823 | cancel_work_sync(&qp->link_cleanup); | |
824 | cancel_delayed_work_sync(&qp->link_work); | |
825 | } | |
fca4d518 | 826 | |
e26a5843 | 827 | if (!nt->link_is_up) |
fce8a7bb | 828 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 829 | |
fce8a7bb JM |
830 | /* The scratchpad registers keep the values if the remote side |
831 | * goes down, blast them now to give them a sane value the next | |
832 | * time they are accessed | |
833 | */ | |
834 | for (i = 0; i < MAX_SPAD; i++) | |
e26a5843 | 835 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
836 | } |
837 | ||
fca4d518 JM |
838 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
839 | { | |
e26a5843 AH |
840 | struct ntb_transport_ctx *nt = |
841 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
842 | |
843 | ntb_transport_link_cleanup(nt); | |
844 | } | |
845 | ||
e26a5843 | 846 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 847 | { |
e26a5843 | 848 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 849 | |
e26a5843 | 850 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 851 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 852 | else |
7b4f2d3c | 853 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
854 | } |
855 | ||
856 | static void ntb_transport_link_work(struct work_struct *work) | |
857 | { | |
e26a5843 AH |
858 | struct ntb_transport_ctx *nt = |
859 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
860 | struct ntb_dev *ndev = nt->ndev; | |
861 | struct pci_dev *pdev = ndev->pdev; | |
862 | resource_size_t size; | |
fce8a7bb | 863 | u32 val; |
84f76685 | 864 | int rc = 0, i, spad; |
fce8a7bb | 865 | |
113fc505 | 866 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
867 | for (i = 0; i < nt->mw_count; i++) { |
868 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 869 | |
e26a5843 AH |
870 | if (max_mw_size && size > max_mw_size) |
871 | size = max_mw_size; | |
fce8a7bb | 872 | |
e26a5843 | 873 | spad = MW0_SZ_HIGH + (i * 2); |
fdcb4b2e | 874 | ntb_peer_spad_write(ndev, spad, upper_32_bits(size)); |
fce8a7bb | 875 | |
e26a5843 | 876 | spad = MW0_SZ_LOW + (i * 2); |
fdcb4b2e | 877 | ntb_peer_spad_write(ndev, spad, lower_32_bits(size)); |
fce8a7bb JM |
878 | } |
879 | ||
e26a5843 | 880 | ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
fce8a7bb | 881 | |
e26a5843 | 882 | ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
fce8a7bb | 883 | |
e26a5843 | 884 | ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 885 | |
e26a5843 | 886 | /* Query the remote side for its info */ |
0f69a7df | 887 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
888 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
889 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 890 | goto out; |
fce8a7bb | 891 | |
0f69a7df | 892 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 893 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 894 | if (val != nt->qp_count) |
fce8a7bb | 895 | goto out; |
fce8a7bb | 896 | |
0f69a7df | 897 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 898 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
899 | if (val != nt->mw_count) |
900 | goto out; | |
fce8a7bb | 901 | |
e26a5843 | 902 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 903 | u64 val64; |
fce8a7bb | 904 | |
0f69a7df | 905 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 906 | val64 = (u64)val << 32; |
113fc505 | 907 | |
0f69a7df | 908 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
909 | val64 |= val; |
910 | ||
e26a5843 | 911 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
912 | |
913 | rc = ntb_set_mw(nt, i, val64); | |
914 | if (rc) | |
915 | goto out1; | |
916 | } | |
fce8a7bb | 917 | |
e26a5843 | 918 | nt->link_is_up = true; |
fce8a7bb | 919 | |
e26a5843 AH |
920 | for (i = 0; i < nt->qp_count; i++) { |
921 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
922 | |
923 | ntb_transport_setup_qp_mw(nt, i); | |
924 | ||
e26a5843 | 925 | if (qp->client_ready) |
fce8a7bb JM |
926 | schedule_delayed_work(&qp->link_work, 0); |
927 | } | |
928 | ||
929 | return; | |
930 | ||
113fc505 | 931 | out1: |
e26a5843 | 932 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 933 | ntb_free_mw(nt, i); |
84f76685 DJ |
934 | |
935 | /* if there's an actual failure, we should just bail */ | |
936 | if (rc < 0) { | |
937 | ntb_link_disable(ndev); | |
938 | return; | |
939 | } | |
940 | ||
fce8a7bb | 941 | out: |
e26a5843 | 942 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
943 | schedule_delayed_work(&nt->link_work, |
944 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
945 | } | |
946 | ||
947 | static void ntb_qp_link_work(struct work_struct *work) | |
948 | { | |
949 | struct ntb_transport_qp *qp = container_of(work, | |
950 | struct ntb_transport_qp, | |
951 | link_work.work); | |
e26a5843 AH |
952 | struct pci_dev *pdev = qp->ndev->pdev; |
953 | struct ntb_transport_ctx *nt = qp->transport; | |
954 | int val; | |
fce8a7bb | 955 | |
e26a5843 | 956 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 957 | |
e26a5843 | 958 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 959 | |
e26a5843 | 960 | ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
961 | |
962 | /* query remote spad for qp ready bits */ | |
e26a5843 | 963 | ntb_peer_spad_read(nt->ndev, QP_LINKS); |
28762289 | 964 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
965 | |
966 | /* See if the remote side is up */ | |
e26a5843 | 967 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 968 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 | 969 | qp->link_is_up = true; |
e9021331 | 970 | qp->active = true; |
e26a5843 | 971 | |
fce8a7bb | 972 | if (qp->event_handler) |
e26a5843 | 973 | qp->event_handler(qp->cb_data, qp->link_is_up); |
8b5a22d8 | 974 | |
e9021331 DJ |
975 | if (qp->active) |
976 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 977 | } else if (nt->link_is_up) |
fce8a7bb JM |
978 | schedule_delayed_work(&qp->link_work, |
979 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
980 | } | |
981 | ||
e26a5843 | 982 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 983 | unsigned int qp_num) |
fce8a7bb JM |
984 | { |
985 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
986 | phys_addr_t mw_base; |
987 | resource_size_t mw_size; | |
ef114ed5 | 988 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 989 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 990 | u64 qp_offset; |
948d3a65 | 991 | |
e26a5843 AH |
992 | mw_count = nt->mw_count; |
993 | qp_count = nt->qp_count; | |
fce8a7bb | 994 | |
e26a5843 | 995 | mw_num = QP_TO_MW(nt, qp_num); |
e26a5843 AH |
996 | |
997 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
998 | qp->qp_num = qp_num; |
999 | qp->transport = nt; | |
1000 | qp->ndev = nt->ndev; | |
e26a5843 | 1001 | qp->client_ready = false; |
fce8a7bb | 1002 | qp->event_handler = NULL; |
2849b5d7 | 1003 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 1004 | |
e26a5843 AH |
1005 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
1006 | num_qps_mw = qp_count / mw_count + 1; | |
ef114ed5 | 1007 | else |
e26a5843 AH |
1008 | num_qps_mw = qp_count / mw_count; |
1009 | ||
1010 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
1011 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 1012 | |
e26a5843 | 1013 | tx_size = (unsigned int)mw_size / num_qps_mw; |
c92ba3c5 | 1014 | qp_offset = tx_size * (qp_num / mw_count); |
e26a5843 AH |
1015 | |
1016 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
1017 | if (!qp->tx_mw) |
1018 | return -EINVAL; | |
1019 | ||
e26a5843 | 1020 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
1021 | if (!qp->tx_mw_phys) |
1022 | return -EINVAL; | |
1023 | ||
793c20e9 | 1024 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 1025 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 1026 | |
c9d534c8 JM |
1027 | /* Due to housekeeping, there must be atleast 2 buffs */ |
1028 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 1029 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 1030 | |
c8650fd0 | 1031 | if (nt->debugfs_node_dir) { |
fce8a7bb JM |
1032 | char debugfs_name[4]; |
1033 | ||
1034 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
1035 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
c8650fd0 | 1036 | nt->debugfs_node_dir); |
fce8a7bb JM |
1037 | |
1038 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
1039 | qp->debugfs_dir, qp, | |
1040 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
1041 | } else { |
1042 | qp->debugfs_dir = NULL; | |
1043 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
1044 | } |
1045 | ||
1046 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 1047 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb | 1048 | |
da2e5ae5 | 1049 | spin_lock_init(&qp->ntb_rx_q_lock); |
fce8a7bb JM |
1050 | spin_lock_init(&qp->ntb_tx_free_q_lock); |
1051 | ||
da2e5ae5 | 1052 | INIT_LIST_HEAD(&qp->rx_post_q); |
fce8a7bb JM |
1053 | INIT_LIST_HEAD(&qp->rx_pend_q); |
1054 | INIT_LIST_HEAD(&qp->rx_free_q); | |
1055 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 1056 | |
e26a5843 AH |
1057 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
1058 | (unsigned long)qp); | |
1059 | ||
282a2fee | 1060 | return 0; |
fce8a7bb JM |
1061 | } |
1062 | ||
e26a5843 | 1063 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1064 | { |
e26a5843 AH |
1065 | struct ntb_transport_ctx *nt; |
1066 | struct ntb_transport_mw *mw; | |
1067 | unsigned int mw_count, qp_count; | |
1068 | u64 qp_bitmap; | |
1199aa61 | 1069 | int node; |
fce8a7bb JM |
1070 | int rc, i; |
1071 | ||
19645a07 LG |
1072 | mw_count = ntb_mw_count(ndev); |
1073 | if (ntb_spad_count(ndev) < (NUM_MWS + 1 + mw_count * 2)) { | |
1074 | dev_err(&ndev->dev, "Not enough scratch pad registers for %s", | |
1075 | NTB_TRANSPORT_NAME); | |
1076 | return -EIO; | |
1077 | } | |
1078 | ||
e26a5843 AH |
1079 | if (ntb_db_is_unsafe(ndev)) |
1080 | dev_dbg(&ndev->dev, | |
1081 | "doorbell is unsafe, proceed anyway...\n"); | |
1082 | if (ntb_spad_is_unsafe(ndev)) | |
1083 | dev_dbg(&ndev->dev, | |
1084 | "scratchpad is unsafe, proceed anyway...\n"); | |
1085 | ||
1199aa61 AH |
1086 | node = dev_to_node(&ndev->dev); |
1087 | ||
1088 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
1089 | if (!nt) |
1090 | return -ENOMEM; | |
1091 | ||
e26a5843 AH |
1092 | nt->ndev = ndev; |
1093 | ||
e26a5843 AH |
1094 | nt->mw_count = mw_count; |
1095 | ||
1199aa61 AH |
1096 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
1097 | GFP_KERNEL, node); | |
e26a5843 AH |
1098 | if (!nt->mw_vec) { |
1099 | rc = -ENOMEM; | |
fce8a7bb JM |
1100 | goto err; |
1101 | } | |
1102 | ||
e26a5843 AH |
1103 | for (i = 0; i < mw_count; i++) { |
1104 | mw = &nt->mw_vec[i]; | |
1105 | ||
1106 | rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, | |
1107 | &mw->xlat_align, &mw->xlat_align_size); | |
1108 | if (rc) | |
1109 | goto err1; | |
1110 | ||
06917f75 | 1111 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
1112 | if (!mw->vbase) { |
1113 | rc = -ENOMEM; | |
1114 | goto err1; | |
1115 | } | |
1116 | ||
1117 | mw->buff_size = 0; | |
1118 | mw->xlat_size = 0; | |
1119 | mw->virt_addr = NULL; | |
1120 | mw->dma_addr = 0; | |
948d3a65 JM |
1121 | } |
1122 | ||
e26a5843 AH |
1123 | qp_bitmap = ntb_db_valid_mask(ndev); |
1124 | ||
1125 | qp_count = ilog2(qp_bitmap); | |
1126 | if (max_num_clients && max_num_clients < qp_count) | |
1127 | qp_count = max_num_clients; | |
1128 | else if (mw_count < qp_count) | |
1129 | qp_count = mw_count; | |
1130 | ||
1131 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1132 | ||
1133 | nt->qp_count = qp_count; | |
1134 | nt->qp_bitmap = qp_bitmap; | |
1135 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1136 | |
1199aa61 AH |
1137 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1138 | GFP_KERNEL, node); | |
e26a5843 | 1139 | if (!nt->qp_vec) { |
fce8a7bb | 1140 | rc = -ENOMEM; |
d4adee09 | 1141 | goto err1; |
fce8a7bb JM |
1142 | } |
1143 | ||
c8650fd0 DJ |
1144 | if (nt_debugfs_dir) { |
1145 | nt->debugfs_node_dir = | |
1146 | debugfs_create_dir(pci_name(ndev->pdev), | |
1147 | nt_debugfs_dir); | |
1148 | } | |
1149 | ||
e26a5843 | 1150 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1151 | rc = ntb_transport_init_queue(nt, i); |
1152 | if (rc) | |
d4adee09 | 1153 | goto err2; |
282a2fee | 1154 | } |
fce8a7bb JM |
1155 | |
1156 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1157 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1158 | |
e26a5843 | 1159 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1160 | if (rc) |
d4adee09 | 1161 | goto err2; |
fce8a7bb JM |
1162 | |
1163 | INIT_LIST_HEAD(&nt->client_devs); | |
1164 | rc = ntb_bus_init(nt); | |
1165 | if (rc) | |
d4adee09 | 1166 | goto err3; |
fce8a7bb | 1167 | |
e26a5843 AH |
1168 | nt->link_is_up = false; |
1169 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1170 | ntb_link_event(ndev); | |
fce8a7bb JM |
1171 | |
1172 | return 0; | |
1173 | ||
948d3a65 | 1174 | err3: |
d4adee09 | 1175 | ntb_clear_ctx(ndev); |
948d3a65 | 1176 | err2: |
d4adee09 | 1177 | kfree(nt->qp_vec); |
fce8a7bb | 1178 | err1: |
e26a5843 AH |
1179 | while (i--) { |
1180 | mw = &nt->mw_vec[i]; | |
1181 | iounmap(mw->vbase); | |
1182 | } | |
d4adee09 | 1183 | kfree(nt->mw_vec); |
fce8a7bb | 1184 | err: |
fce8a7bb JM |
1185 | kfree(nt); |
1186 | return rc; | |
1187 | } | |
1188 | ||
e26a5843 | 1189 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1190 | { |
e26a5843 AH |
1191 | struct ntb_transport_ctx *nt = ndev->ctx; |
1192 | struct ntb_transport_qp *qp; | |
1193 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1194 | int i; |
1195 | ||
fca4d518 | 1196 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1197 | cancel_work_sync(&nt->link_cleanup); |
1198 | cancel_delayed_work_sync(&nt->link_work); | |
1199 | ||
1200 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1201 | |
1202 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1203 | for (i = 0; i < nt->qp_count; i++) { |
1204 | qp = &nt->qp_vec[i]; | |
1205 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1206 | ntb_transport_free_queue(qp); | |
1207 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1208 | } |
fce8a7bb | 1209 | |
e26a5843 AH |
1210 | ntb_link_disable(ndev); |
1211 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1212 | |
e26a5843 | 1213 | ntb_bus_remove(nt); |
fce8a7bb | 1214 | |
e26a5843 | 1215 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1216 | ntb_free_mw(nt, i); |
e26a5843 AH |
1217 | iounmap(nt->mw_vec[i].vbase); |
1218 | } | |
fce8a7bb | 1219 | |
e26a5843 AH |
1220 | kfree(nt->qp_vec); |
1221 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1222 | kfree(nt); |
1223 | } | |
1224 | ||
da2e5ae5 | 1225 | static void ntb_complete_rxc(struct ntb_transport_qp *qp) |
fce8a7bb | 1226 | { |
da2e5ae5 AH |
1227 | struct ntb_queue_entry *entry; |
1228 | void *cb_data; | |
1229 | unsigned int len; | |
1230 | unsigned long irqflags; | |
1231 | ||
1232 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1233 | ||
1234 | while (!list_empty(&qp->rx_post_q)) { | |
1235 | entry = list_first_entry(&qp->rx_post_q, | |
1236 | struct ntb_queue_entry, entry); | |
1237 | if (!(entry->flags & DESC_DONE_FLAG)) | |
1238 | break; | |
1239 | ||
1240 | entry->rx_hdr->flags = 0; | |
72203572 | 1241 | iowrite32(entry->rx_index, &qp->rx_info->entry); |
da2e5ae5 AH |
1242 | |
1243 | cb_data = entry->cb_data; | |
1244 | len = entry->len; | |
1245 | ||
1246 | list_move_tail(&entry->entry, &qp->rx_free_q); | |
1247 | ||
1248 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); | |
1249 | ||
1250 | if (qp->rx_handler && qp->client_ready) | |
1251 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
1252 | ||
1253 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1254 | } | |
282a2fee | 1255 | |
da2e5ae5 AH |
1256 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
1257 | } | |
fce8a7bb | 1258 | |
72203572 DJ |
1259 | static void ntb_rx_copy_callback(void *data, |
1260 | const struct dmaengine_result *res) | |
da2e5ae5 AH |
1261 | { |
1262 | struct ntb_queue_entry *entry = data; | |
fce8a7bb | 1263 | |
72203572 DJ |
1264 | /* we need to check DMA results if we are using DMA */ |
1265 | if (res) { | |
1266 | enum dmaengine_tx_result dma_err = res->result; | |
1267 | ||
1268 | switch (dma_err) { | |
1269 | case DMA_TRANS_READ_FAILED: | |
1270 | case DMA_TRANS_WRITE_FAILED: | |
1271 | entry->errors++; | |
1272 | case DMA_TRANS_ABORTED: | |
1273 | { | |
1274 | struct ntb_transport_qp *qp = entry->qp; | |
1275 | void *offset = qp->rx_buff + qp->rx_max_frame * | |
1276 | qp->rx_index; | |
1277 | ||
1278 | ntb_memcpy_rx(entry, offset); | |
1279 | qp->rx_memcpy++; | |
1280 | return; | |
1281 | } | |
1282 | ||
1283 | case DMA_TRANS_NOERROR: | |
1284 | default: | |
1285 | break; | |
1286 | } | |
1287 | } | |
1288 | ||
da2e5ae5 | 1289 | entry->flags |= DESC_DONE_FLAG; |
448c6fb3 | 1290 | |
da2e5ae5 | 1291 | ntb_complete_rxc(entry->qp); |
fce8a7bb JM |
1292 | } |
1293 | ||
282a2fee JM |
1294 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1295 | { | |
1296 | void *buf = entry->buf; | |
1297 | size_t len = entry->len; | |
1298 | ||
1299 | memcpy(buf, offset, len); | |
1300 | ||
e26a5843 AH |
1301 | /* Ensure that the data is fully copied out before clearing the flag */ |
1302 | wmb(); | |
1303 | ||
72203572 | 1304 | ntb_rx_copy_callback(entry, NULL); |
282a2fee JM |
1305 | } |
1306 | ||
72203572 | 1307 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset) |
282a2fee JM |
1308 | { |
1309 | struct dma_async_tx_descriptor *txd; | |
1310 | struct ntb_transport_qp *qp = entry->qp; | |
569410ca | 1311 | struct dma_chan *chan = qp->rx_dma_chan; |
282a2fee | 1312 | struct dma_device *device; |
da2e5ae5 | 1313 | size_t pay_off, buff_off, len; |
6f57fd05 | 1314 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1315 | dma_cookie_t cookie; |
1316 | void *buf = entry->buf; | |
8c874cc1 | 1317 | int retries = 0; |
282a2fee | 1318 | |
da2e5ae5 | 1319 | len = entry->len; |
282a2fee | 1320 | device = chan->device; |
e26a5843 AH |
1321 | pay_off = (size_t)offset & ~PAGE_MASK; |
1322 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1323 | |
1324 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
905921e7 | 1325 | goto err; |
282a2fee | 1326 | |
6f57fd05 BZ |
1327 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1328 | if (!unmap) | |
905921e7 | 1329 | goto err; |
282a2fee | 1330 | |
6f57fd05 BZ |
1331 | unmap->len = len; |
1332 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1333 | pay_off, len, DMA_TO_DEVICE); | |
1334 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1335 | goto err_get_unmap; | |
1336 | ||
1337 | unmap->to_cnt = 1; | |
282a2fee | 1338 | |
6f57fd05 BZ |
1339 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1340 | buff_off, len, DMA_FROM_DEVICE); | |
1341 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1342 | goto err_get_unmap; | |
1343 | ||
1344 | unmap->from_cnt = 1; | |
1345 | ||
8c874cc1 | 1346 | for (retries = 0; retries < DMA_RETRIES; retries++) { |
72203572 DJ |
1347 | txd = device->device_prep_dma_memcpy(chan, |
1348 | unmap->addr[1], | |
8c874cc1 DJ |
1349 | unmap->addr[0], len, |
1350 | DMA_PREP_INTERRUPT); | |
1351 | if (txd) | |
1352 | break; | |
1353 | ||
1354 | set_current_state(TASK_INTERRUPTIBLE); | |
1355 | schedule_timeout(DMA_OUT_RESOURCE_TO); | |
1356 | } | |
1357 | ||
1358 | if (!txd) { | |
1359 | qp->dma_rx_prep_err++; | |
6f57fd05 | 1360 | goto err_get_unmap; |
8c874cc1 | 1361 | } |
282a2fee | 1362 | |
72203572 | 1363 | txd->callback_result = ntb_rx_copy_callback; |
282a2fee | 1364 | txd->callback_param = entry; |
6f57fd05 | 1365 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1366 | |
1367 | cookie = dmaengine_submit(txd); | |
1368 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1369 | goto err_set_unmap; |
1370 | ||
1371 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1372 | |
1373 | qp->last_cookie = cookie; | |
1374 | ||
1375 | qp->rx_async++; | |
1376 | ||
72203572 | 1377 | return 0; |
282a2fee | 1378 | |
6f57fd05 BZ |
1379 | err_set_unmap: |
1380 | dmaengine_unmap_put(unmap); | |
1381 | err_get_unmap: | |
1382 | dmaengine_unmap_put(unmap); | |
72203572 DJ |
1383 | err: |
1384 | return -ENXIO; | |
1385 | } | |
1386 | ||
1387 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) | |
1388 | { | |
1389 | struct ntb_transport_qp *qp = entry->qp; | |
1390 | struct dma_chan *chan = qp->rx_dma_chan; | |
1391 | int res; | |
1392 | ||
1393 | if (!chan) | |
1394 | goto err; | |
1395 | ||
1396 | if (entry->len < copy_bytes) | |
1397 | goto err; | |
1398 | ||
1399 | res = ntb_async_rx_submit(entry, offset); | |
1400 | if (res < 0) | |
1401 | goto err; | |
1402 | ||
1403 | if (!entry->retries) | |
1404 | qp->rx_async++; | |
1405 | ||
1406 | return; | |
1407 | ||
282a2fee JM |
1408 | err: |
1409 | ntb_memcpy_rx(entry, offset); | |
1410 | qp->rx_memcpy++; | |
1411 | } | |
1412 | ||
fce8a7bb JM |
1413 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1414 | { | |
1415 | struct ntb_payload_header *hdr; | |
1416 | struct ntb_queue_entry *entry; | |
1417 | void *offset; | |
1418 | ||
793c20e9 JM |
1419 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1420 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1421 | ||
e26a5843 AH |
1422 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1423 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1424 | |
fce8a7bb | 1425 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1426 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1427 | qp->rx_ring_empty++; |
1428 | return -EAGAIN; | |
1429 | } | |
1430 | ||
e26a5843 AH |
1431 | if (hdr->flags & LINK_DOWN_FLAG) { |
1432 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1433 | ntb_qp_link_down(qp); | |
1434 | hdr->flags = 0; | |
c0900b33 | 1435 | return -EAGAIN; |
e26a5843 AH |
1436 | } |
1437 | ||
1438 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1439 | dev_dbg(&qp->ndev->pdev->dev, | |
1440 | "version mismatch, expected %llu - got %u\n", | |
1441 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1442 | qp->rx_err_ver++; |
1443 | return -EIO; | |
1444 | } | |
1445 | ||
da2e5ae5 | 1446 | entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); |
e26a5843 AH |
1447 | if (!entry) { |
1448 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1449 | qp->rx_err_no_buf++; | |
da2e5ae5 | 1450 | return -EAGAIN; |
fce8a7bb JM |
1451 | } |
1452 | ||
da2e5ae5 | 1453 | entry->rx_hdr = hdr; |
72203572 | 1454 | entry->rx_index = qp->rx_index; |
da2e5ae5 | 1455 | |
282a2fee | 1456 | if (hdr->len > entry->len) { |
e26a5843 AH |
1457 | dev_dbg(&qp->ndev->pdev->dev, |
1458 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1459 | hdr->len, entry->len); |
e26a5843 | 1460 | qp->rx_err_oflow++; |
282a2fee | 1461 | |
da2e5ae5 AH |
1462 | entry->len = -EIO; |
1463 | entry->flags |= DESC_DONE_FLAG; | |
fce8a7bb | 1464 | |
da2e5ae5 AH |
1465 | ntb_complete_rxc(qp); |
1466 | } else { | |
1467 | dev_dbg(&qp->ndev->pdev->dev, | |
1468 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1469 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
e26a5843 | 1470 | |
da2e5ae5 AH |
1471 | qp->rx_bytes += hdr->len; |
1472 | qp->rx_pkts++; | |
e26a5843 | 1473 | |
da2e5ae5 | 1474 | entry->len = hdr->len; |
282a2fee | 1475 | |
da2e5ae5 AH |
1476 | ntb_async_rx(entry, offset); |
1477 | } | |
fce8a7bb | 1478 | |
282a2fee JM |
1479 | qp->rx_index++; |
1480 | qp->rx_index %= qp->rx_max_entry; | |
1481 | ||
1482 | return 0; | |
fce8a7bb JM |
1483 | } |
1484 | ||
e26a5843 | 1485 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1486 | { |
e26a5843 | 1487 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1488 | int rc, i; |
fce8a7bb | 1489 | |
e26a5843 AH |
1490 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1491 | __func__, qp->qp_num); | |
e8aeb60c | 1492 | |
c336acd3 JM |
1493 | /* Limit the number of packets processed in a single interrupt to |
1494 | * provide fairness to others | |
1495 | */ | |
1496 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1497 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1498 | if (rc) |
1499 | break; | |
1500 | } | |
282a2fee | 1501 | |
569410ca DJ |
1502 | if (i && qp->rx_dma_chan) |
1503 | dma_async_issue_pending(qp->rx_dma_chan); | |
fce8a7bb | 1504 | |
e26a5843 AH |
1505 | if (i == qp->rx_max_entry) { |
1506 | /* there is more work to do */ | |
e9021331 DJ |
1507 | if (qp->active) |
1508 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
1509 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { |
1510 | /* the doorbell bit is set: clear it */ | |
1511 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1512 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1513 | ntb_db_read(qp->ndev); | |
1514 | ||
1515 | /* an interrupt may have arrived between finishing | |
1516 | * ntb_process_rxc and clearing the doorbell bit: | |
1517 | * there might be some more work to do. | |
1518 | */ | |
e9021331 DJ |
1519 | if (qp->active) |
1520 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 1521 | } |
fce8a7bb JM |
1522 | } |
1523 | ||
9cabc269 DJ |
1524 | static void ntb_tx_copy_callback(void *data, |
1525 | const struct dmaengine_result *res) | |
fce8a7bb | 1526 | { |
282a2fee JM |
1527 | struct ntb_queue_entry *entry = data; |
1528 | struct ntb_transport_qp *qp = entry->qp; | |
1529 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1530 | |
9cabc269 DJ |
1531 | /* we need to check DMA results if we are using DMA */ |
1532 | if (res) { | |
1533 | enum dmaengine_tx_result dma_err = res->result; | |
1534 | ||
1535 | switch (dma_err) { | |
1536 | case DMA_TRANS_READ_FAILED: | |
1537 | case DMA_TRANS_WRITE_FAILED: | |
1538 | entry->errors++; | |
1539 | case DMA_TRANS_ABORTED: | |
1540 | { | |
1541 | void __iomem *offset = | |
1542 | qp->tx_mw + qp->tx_max_frame * | |
1543 | entry->tx_index; | |
1544 | ||
1545 | /* resubmit via CPU */ | |
1546 | ntb_memcpy_tx(entry, offset); | |
1547 | qp->tx_memcpy++; | |
1548 | return; | |
1549 | } | |
1550 | ||
1551 | case DMA_TRANS_NOERROR: | |
1552 | default: | |
1553 | break; | |
1554 | } | |
1555 | } | |
1556 | ||
74465645 | 1557 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1558 | |
e26a5843 | 1559 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1560 | |
1561 | /* The entry length can only be zero if the packet is intended to be a | |
1562 | * "link down" or similar. Since no payload is being sent in these | |
1563 | * cases, there is nothing to add to the completion queue. | |
1564 | */ | |
1565 | if (entry->len > 0) { | |
1566 | qp->tx_bytes += entry->len; | |
1567 | ||
1568 | if (qp->tx_handler) | |
1569 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1570 | entry->len); | |
1571 | } | |
1572 | ||
1573 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1574 | } | |
1575 | ||
282a2fee | 1576 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1577 | { |
06917f75 DJ |
1578 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1579 | /* | |
1580 | * Using non-temporal mov to improve performance on non-cached | |
1581 | * writes, even though we aren't actually copying from user space. | |
1582 | */ | |
1583 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1584 | #else | |
282a2fee | 1585 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1586 | #endif |
282a2fee | 1587 | |
e26a5843 AH |
1588 | /* Ensure that the data is fully copied out before setting the flags */ |
1589 | wmb(); | |
1590 | ||
9cabc269 | 1591 | ntb_tx_copy_callback(entry, NULL); |
282a2fee JM |
1592 | } |
1593 | ||
9cabc269 DJ |
1594 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
1595 | struct ntb_queue_entry *entry) | |
282a2fee | 1596 | { |
282a2fee | 1597 | struct dma_async_tx_descriptor *txd; |
569410ca | 1598 | struct dma_chan *chan = qp->tx_dma_chan; |
282a2fee | 1599 | struct dma_device *device; |
9cabc269 DJ |
1600 | size_t len = entry->len; |
1601 | void *buf = entry->buf; | |
282a2fee | 1602 | size_t dest_off, buff_off; |
6f57fd05 BZ |
1603 | struct dmaengine_unmap_data *unmap; |
1604 | dma_addr_t dest; | |
282a2fee | 1605 | dma_cookie_t cookie; |
8c874cc1 | 1606 | int retries = 0; |
fce8a7bb | 1607 | |
282a2fee | 1608 | device = chan->device; |
9cabc269 | 1609 | dest = qp->tx_mw_phys + qp->tx_max_frame * entry->tx_index; |
e26a5843 AH |
1610 | buff_off = (size_t)buf & ~PAGE_MASK; |
1611 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1612 | |
1613 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1614 | goto err; | |
1615 | ||
6f57fd05 BZ |
1616 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1617 | if (!unmap) | |
282a2fee JM |
1618 | goto err; |
1619 | ||
6f57fd05 BZ |
1620 | unmap->len = len; |
1621 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1622 | buff_off, len, DMA_TO_DEVICE); | |
1623 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1624 | goto err_get_unmap; | |
1625 | ||
1626 | unmap->to_cnt = 1; | |
1627 | ||
8c874cc1 | 1628 | for (retries = 0; retries < DMA_RETRIES; retries++) { |
9cabc269 DJ |
1629 | txd = device->device_prep_dma_memcpy(chan, dest, |
1630 | unmap->addr[0], len, | |
1631 | DMA_PREP_INTERRUPT); | |
8c874cc1 DJ |
1632 | if (txd) |
1633 | break; | |
1634 | ||
1635 | set_current_state(TASK_INTERRUPTIBLE); | |
1636 | schedule_timeout(DMA_OUT_RESOURCE_TO); | |
1637 | } | |
1638 | ||
1639 | if (!txd) { | |
1640 | qp->dma_tx_prep_err++; | |
6f57fd05 | 1641 | goto err_get_unmap; |
8c874cc1 | 1642 | } |
282a2fee | 1643 | |
9cabc269 | 1644 | txd->callback_result = ntb_tx_copy_callback; |
282a2fee | 1645 | txd->callback_param = entry; |
6f57fd05 | 1646 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1647 | |
1648 | cookie = dmaengine_submit(txd); | |
1649 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1650 | goto err_set_unmap; |
1651 | ||
1652 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1653 | |
1654 | dma_async_issue_pending(chan); | |
282a2fee | 1655 | |
9cabc269 | 1656 | return 0; |
6f57fd05 BZ |
1657 | err_set_unmap: |
1658 | dmaengine_unmap_put(unmap); | |
1659 | err_get_unmap: | |
1660 | dmaengine_unmap_put(unmap); | |
9cabc269 DJ |
1661 | err: |
1662 | return -ENXIO; | |
1663 | } | |
1664 | ||
1665 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1666 | struct ntb_queue_entry *entry) | |
1667 | { | |
1668 | struct ntb_payload_header __iomem *hdr; | |
1669 | struct dma_chan *chan = qp->tx_dma_chan; | |
1670 | void __iomem *offset; | |
1671 | int res; | |
1672 | ||
1673 | entry->tx_index = qp->tx_index; | |
1674 | offset = qp->tx_mw + qp->tx_max_frame * entry->tx_index; | |
1675 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1676 | entry->tx_hdr = hdr; | |
1677 | ||
1678 | iowrite32(entry->len, &hdr->len); | |
1679 | iowrite32((u32)qp->tx_pkts, &hdr->ver); | |
1680 | ||
1681 | if (!chan) | |
1682 | goto err; | |
1683 | ||
1684 | if (entry->len < copy_bytes) | |
1685 | goto err; | |
1686 | ||
1687 | res = ntb_async_tx_submit(qp, entry); | |
1688 | if (res < 0) | |
1689 | goto err; | |
1690 | ||
1691 | if (!entry->retries) | |
1692 | qp->tx_async++; | |
1693 | ||
1694 | return; | |
1695 | ||
282a2fee JM |
1696 | err: |
1697 | ntb_memcpy_tx(entry, offset); | |
1698 | qp->tx_memcpy++; | |
1699 | } | |
1700 | ||
1701 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1702 | struct ntb_queue_entry *entry) | |
1703 | { | |
793c20e9 | 1704 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1705 | qp->tx_ring_full++; |
1706 | return -EAGAIN; | |
1707 | } | |
1708 | ||
ef114ed5 | 1709 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb | 1710 | if (qp->tx_handler) |
179f912a | 1711 | qp->tx_handler(qp, qp->cb_data, NULL, -EIO); |
fce8a7bb JM |
1712 | |
1713 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1714 | &qp->tx_free_q); | |
1715 | return 0; | |
1716 | } | |
1717 | ||
282a2fee | 1718 | ntb_async_tx(qp, entry); |
fce8a7bb | 1719 | |
793c20e9 JM |
1720 | qp->tx_index++; |
1721 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1722 | |
1723 | qp->tx_pkts++; | |
1724 | ||
1725 | return 0; | |
1726 | } | |
1727 | ||
1728 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1729 | { | |
e26a5843 | 1730 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1731 | struct ntb_queue_entry *entry; |
1732 | int i, rc; | |
1733 | ||
e26a5843 | 1734 | if (!qp->link_is_up) |
fce8a7bb JM |
1735 | return; |
1736 | ||
e22e0b9d | 1737 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1738 | |
1739 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1740 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1741 | if (entry) |
1742 | break; | |
1743 | msleep(100); | |
1744 | } | |
1745 | ||
1746 | if (!entry) | |
1747 | return; | |
1748 | ||
1749 | entry->cb_data = NULL; | |
1750 | entry->buf = NULL; | |
1751 | entry->len = 0; | |
1752 | entry->flags = LINK_DOWN_FLAG; | |
1753 | ||
1754 | rc = ntb_process_tx(qp, entry); | |
1755 | if (rc) | |
1756 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1757 | qp->qp_num); | |
2849b5d7 AH |
1758 | |
1759 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1760 | } |
1761 | ||
1199aa61 AH |
1762 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1763 | { | |
1764 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1765 | } | |
1766 | ||
fce8a7bb JM |
1767 | /** |
1768 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1769 | * @rx_handler: receive callback function | |
1770 | * @tx_handler: transmit callback function | |
1771 | * @event_handler: event callback function | |
1772 | * | |
1773 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1774 | * routine for both transmit and receive. The receive callback routine will be | |
1775 | * used to pass up data when the transport has received it on the queue. The | |
1776 | * transmit callback routine will be called when the transport has completed the | |
1777 | * transmission of the data on the queue and the data is ready to be freed. | |
1778 | * | |
1779 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1780 | */ | |
1781 | struct ntb_transport_qp * | |
e26a5843 | 1782 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1783 | const struct ntb_queue_handlers *handlers) |
1784 | { | |
e26a5843 AH |
1785 | struct ntb_dev *ndev; |
1786 | struct pci_dev *pdev; | |
1787 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1788 | struct ntb_queue_entry *entry; |
1789 | struct ntb_transport_qp *qp; | |
e26a5843 | 1790 | u64 qp_bit; |
fce8a7bb | 1791 | unsigned int free_queue; |
1199aa61 AH |
1792 | dma_cap_mask_t dma_mask; |
1793 | int node; | |
e26a5843 | 1794 | int i; |
fce8a7bb | 1795 | |
e26a5843 AH |
1796 | ndev = dev_ntb(client_dev->parent); |
1797 | pdev = ndev->pdev; | |
1798 | nt = ndev->ctx; | |
fce8a7bb | 1799 | |
1199aa61 AH |
1800 | node = dev_to_node(&ndev->dev); |
1801 | ||
fce8a7bb JM |
1802 | free_queue = ffs(nt->qp_bitmap); |
1803 | if (!free_queue) | |
1804 | goto err; | |
1805 | ||
1806 | /* decrement free_queue to make it zero based */ | |
1807 | free_queue--; | |
1808 | ||
e26a5843 AH |
1809 | qp = &nt->qp_vec[free_queue]; |
1810 | qp_bit = BIT_ULL(qp->qp_num); | |
1811 | ||
1812 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1813 | |
fce8a7bb JM |
1814 | qp->cb_data = data; |
1815 | qp->rx_handler = handlers->rx_handler; | |
1816 | qp->tx_handler = handlers->tx_handler; | |
1817 | qp->event_handler = handlers->event_handler; | |
1818 | ||
1199aa61 AH |
1819 | dma_cap_zero(dma_mask); |
1820 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1821 | ||
a41ef053 | 1822 | if (use_dma) { |
569410ca DJ |
1823 | qp->tx_dma_chan = |
1824 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1825 | (void *)(unsigned long)node); | |
1826 | if (!qp->tx_dma_chan) | |
1827 | dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n"); | |
1828 | ||
1829 | qp->rx_dma_chan = | |
1830 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1831 | (void *)(unsigned long)node); | |
1832 | if (!qp->rx_dma_chan) | |
1833 | dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n"); | |
a41ef053 | 1834 | } else { |
569410ca DJ |
1835 | qp->tx_dma_chan = NULL; |
1836 | qp->rx_dma_chan = NULL; | |
a41ef053 | 1837 | } |
569410ca DJ |
1838 | |
1839 | dev_dbg(&pdev->dev, "Using %s memcpy for TX\n", | |
1840 | qp->tx_dma_chan ? "DMA" : "CPU"); | |
1841 | ||
1842 | dev_dbg(&pdev->dev, "Using %s memcpy for RX\n", | |
1843 | qp->rx_dma_chan ? "DMA" : "CPU"); | |
282a2fee | 1844 | |
fce8a7bb | 1845 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1846 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1847 | if (!entry) |
1848 | goto err1; | |
1849 | ||
282a2fee | 1850 | entry->qp = qp; |
da2e5ae5 | 1851 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
f766755c | 1852 | &qp->rx_free_q); |
fce8a7bb | 1853 | } |
a754a8fc | 1854 | qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; |
fce8a7bb | 1855 | |
a754a8fc | 1856 | for (i = 0; i < qp->tx_max_entry; i++) { |
1199aa61 | 1857 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1858 | if (!entry) |
1859 | goto err2; | |
1860 | ||
282a2fee | 1861 | entry->qp = qp; |
fce8a7bb | 1862 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1863 | &qp->tx_free_q); |
fce8a7bb JM |
1864 | } |
1865 | ||
e26a5843 AH |
1866 | ntb_db_clear(qp->ndev, qp_bit); |
1867 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1868 | |
1869 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1870 | ||
1871 | return qp; | |
1872 | ||
fce8a7bb | 1873 | err2: |
f766755c | 1874 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1875 | kfree(entry); |
1876 | err1: | |
a754a8fc | 1877 | qp->rx_alloc_entry = 0; |
da2e5ae5 | 1878 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1879 | kfree(entry); |
569410ca DJ |
1880 | if (qp->tx_dma_chan) |
1881 | dma_release_channel(qp->tx_dma_chan); | |
1882 | if (qp->rx_dma_chan) | |
1883 | dma_release_channel(qp->rx_dma_chan); | |
e26a5843 | 1884 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1885 | err: |
1886 | return NULL; | |
1887 | } | |
1888 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1889 | ||
1890 | /** | |
1891 | * ntb_transport_free_queue - Frees NTB transport queue | |
1892 | * @qp: NTB queue to be freed | |
1893 | * | |
1894 | * Frees NTB transport queue | |
1895 | */ | |
1896 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1897 | { | |
186f27ff | 1898 | struct pci_dev *pdev; |
fce8a7bb | 1899 | struct ntb_queue_entry *entry; |
e26a5843 | 1900 | u64 qp_bit; |
fce8a7bb JM |
1901 | |
1902 | if (!qp) | |
1903 | return; | |
1904 | ||
e26a5843 | 1905 | pdev = qp->ndev->pdev; |
186f27ff | 1906 | |
e9021331 DJ |
1907 | qp->active = false; |
1908 | ||
569410ca DJ |
1909 | if (qp->tx_dma_chan) { |
1910 | struct dma_chan *chan = qp->tx_dma_chan; | |
1911 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1912 | * processed by the CPU instead of the DAM engine | |
1913 | */ | |
1914 | qp->tx_dma_chan = NULL; | |
1915 | ||
1916 | /* Try to be nice and wait for any queued DMA engine | |
1917 | * transactions to process before smashing it with a rock | |
1918 | */ | |
1919 | dma_sync_wait(chan, qp->last_cookie); | |
1920 | dmaengine_terminate_all(chan); | |
1921 | dma_release_channel(chan); | |
1922 | } | |
1923 | ||
1924 | if (qp->rx_dma_chan) { | |
1925 | struct dma_chan *chan = qp->rx_dma_chan; | |
282a2fee JM |
1926 | /* Putting the dma_chan to NULL will force any new traffic to be |
1927 | * processed by the CPU instead of the DAM engine | |
1928 | */ | |
569410ca | 1929 | qp->rx_dma_chan = NULL; |
282a2fee JM |
1930 | |
1931 | /* Try to be nice and wait for any queued DMA engine | |
1932 | * transactions to process before smashing it with a rock | |
1933 | */ | |
1934 | dma_sync_wait(chan, qp->last_cookie); | |
1935 | dmaengine_terminate_all(chan); | |
1199aa61 | 1936 | dma_release_channel(chan); |
282a2fee | 1937 | } |
fce8a7bb | 1938 | |
e26a5843 AH |
1939 | qp_bit = BIT_ULL(qp->qp_num); |
1940 | ||
1941 | ntb_db_set_mask(qp->ndev, qp_bit); | |
e9021331 | 1942 | tasklet_kill(&qp->rxc_db_work); |
fce8a7bb | 1943 | |
282a2fee JM |
1944 | cancel_delayed_work_sync(&qp->link_work); |
1945 | ||
e26a5843 AH |
1946 | qp->cb_data = NULL; |
1947 | qp->rx_handler = NULL; | |
1948 | qp->tx_handler = NULL; | |
1949 | qp->event_handler = NULL; | |
1950 | ||
da2e5ae5 | 1951 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1952 | kfree(entry); |
1953 | ||
da2e5ae5 AH |
1954 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) { |
1955 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n"); | |
1956 | kfree(entry); | |
1957 | } | |
1958 | ||
1959 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) { | |
1960 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n"); | |
fce8a7bb JM |
1961 | kfree(entry); |
1962 | } | |
1963 | ||
f766755c | 1964 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1965 | kfree(entry); |
1966 | ||
30a4bb1e | 1967 | qp->transport->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1968 | |
1969 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1970 | } | |
1971 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1972 | ||
1973 | /** | |
1974 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1975 | * @qp: NTB queue to be freed | |
1976 | * @len: pointer to variable to write enqueued buffers length | |
1977 | * | |
1978 | * Dequeues unused buffers from receive queue. Should only be used during | |
1979 | * shutdown of qp. | |
1980 | * | |
1981 | * RETURNS: NULL error value on error, or void* for success. | |
1982 | */ | |
1983 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1984 | { | |
1985 | struct ntb_queue_entry *entry; | |
1986 | void *buf; | |
1987 | ||
e26a5843 | 1988 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1989 | return NULL; |
1990 | ||
da2e5ae5 | 1991 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q); |
fce8a7bb JM |
1992 | if (!entry) |
1993 | return NULL; | |
1994 | ||
1995 | buf = entry->cb_data; | |
1996 | *len = entry->len; | |
1997 | ||
da2e5ae5 | 1998 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1999 | |
2000 | return buf; | |
2001 | } | |
2002 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
2003 | ||
2004 | /** | |
2005 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
2006 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
2007 | * @cb: per buffer pointer for callback function to use | |
2008 | * @data: pointer to data buffer that incoming packets will be copied into | |
2009 | * @len: length of the data buffer | |
2010 | * | |
2011 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
2012 | * payload can be received into. | |
2013 | * | |
2014 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2015 | */ | |
2016 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
2017 | unsigned int len) | |
2018 | { | |
2019 | struct ntb_queue_entry *entry; | |
2020 | ||
2021 | if (!qp) | |
2022 | return -EINVAL; | |
2023 | ||
da2e5ae5 | 2024 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q); |
fce8a7bb JM |
2025 | if (!entry) |
2026 | return -ENOMEM; | |
2027 | ||
2028 | entry->cb_data = cb; | |
2029 | entry->buf = data; | |
2030 | entry->len = len; | |
da2e5ae5 | 2031 | entry->flags = 0; |
72203572 DJ |
2032 | entry->retries = 0; |
2033 | entry->errors = 0; | |
2034 | entry->rx_index = 0; | |
da2e5ae5 AH |
2035 | |
2036 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q); | |
fce8a7bb | 2037 | |
e9021331 DJ |
2038 | if (qp->active) |
2039 | tasklet_schedule(&qp->rxc_db_work); | |
fce8a7bb JM |
2040 | |
2041 | return 0; | |
2042 | } | |
2043 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
2044 | ||
2045 | /** | |
2046 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
2047 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
2048 | * @cb: per buffer pointer for callback function to use | |
2049 | * @data: pointer to data buffer that will be sent | |
2050 | * @len: length of the data buffer | |
2051 | * | |
2052 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 2053 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
2054 | * serialize access to the qp. |
2055 | * | |
2056 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2057 | */ | |
2058 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
2059 | unsigned int len) | |
2060 | { | |
2061 | struct ntb_queue_entry *entry; | |
2062 | int rc; | |
2063 | ||
e26a5843 | 2064 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
2065 | return -EINVAL; |
2066 | ||
2067 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
2068 | if (!entry) { |
2069 | qp->tx_err_no_buf++; | |
e74bfeed | 2070 | return -EBUSY; |
282a2fee | 2071 | } |
fce8a7bb JM |
2072 | |
2073 | entry->cb_data = cb; | |
2074 | entry->buf = data; | |
2075 | entry->len = len; | |
2076 | entry->flags = 0; | |
9cabc269 DJ |
2077 | entry->errors = 0; |
2078 | entry->retries = 0; | |
2079 | entry->tx_index = 0; | |
fce8a7bb JM |
2080 | |
2081 | rc = ntb_process_tx(qp, entry); | |
2082 | if (rc) | |
2083 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
2084 | &qp->tx_free_q); | |
2085 | ||
2086 | return rc; | |
2087 | } | |
2088 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
2089 | ||
2090 | /** | |
2091 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
2092 | * @qp: NTB transport layer queue to be enabled | |
2093 | * | |
2094 | * Notify NTB transport layer of client readiness to use queue | |
2095 | */ | |
2096 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
2097 | { | |
2098 | if (!qp) | |
2099 | return; | |
2100 | ||
e26a5843 | 2101 | qp->client_ready = true; |
fce8a7bb | 2102 | |
e26a5843 | 2103 | if (qp->transport->link_is_up) |
fce8a7bb JM |
2104 | schedule_delayed_work(&qp->link_work, 0); |
2105 | } | |
2106 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
2107 | ||
2108 | /** | |
2109 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
2110 | * @qp: NTB transport layer queue to be disabled | |
2111 | * | |
2112 | * Notify NTB transport layer of client's desire to no longer receive data on | |
2113 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 2114 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
2115 | */ |
2116 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
2117 | { | |
e26a5843 | 2118 | int val; |
fce8a7bb JM |
2119 | |
2120 | if (!qp) | |
2121 | return; | |
2122 | ||
e26a5843 | 2123 | qp->client_ready = false; |
fce8a7bb | 2124 | |
e26a5843 | 2125 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 2126 | |
e26a5843 AH |
2127 | ntb_peer_spad_write(qp->ndev, QP_LINKS, |
2128 | val & ~BIT(qp->qp_num)); | |
fce8a7bb | 2129 | |
e26a5843 | 2130 | if (qp->link_is_up) |
fce8a7bb JM |
2131 | ntb_send_link_down(qp); |
2132 | else | |
2133 | cancel_delayed_work_sync(&qp->link_work); | |
2134 | } | |
2135 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
2136 | ||
2137 | /** | |
2138 | * ntb_transport_link_query - Query transport link state | |
2139 | * @qp: NTB transport layer queue to be queried | |
2140 | * | |
2141 | * Query connectivity to the remote system of the NTB transport queue | |
2142 | * | |
2143 | * RETURNS: true for link up or false for link down | |
2144 | */ | |
2145 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
2146 | { | |
186f27ff JM |
2147 | if (!qp) |
2148 | return false; | |
2149 | ||
e26a5843 | 2150 | return qp->link_is_up; |
fce8a7bb JM |
2151 | } |
2152 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
2153 | ||
2154 | /** | |
2155 | * ntb_transport_qp_num - Query the qp number | |
2156 | * @qp: NTB transport layer queue to be queried | |
2157 | * | |
2158 | * Query qp number of the NTB transport queue | |
2159 | * | |
2160 | * RETURNS: a zero based number specifying the qp number | |
2161 | */ | |
2162 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
2163 | { | |
186f27ff JM |
2164 | if (!qp) |
2165 | return 0; | |
2166 | ||
fce8a7bb JM |
2167 | return qp->qp_num; |
2168 | } | |
2169 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
2170 | ||
2171 | /** | |
2172 | * ntb_transport_max_size - Query the max payload size of a qp | |
2173 | * @qp: NTB transport layer queue to be queried | |
2174 | * | |
2175 | * Query the maximum payload size permissible on the given qp | |
2176 | * | |
2177 | * RETURNS: the max payload size of a qp | |
2178 | */ | |
ef114ed5 | 2179 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 2180 | { |
04afde45 | 2181 | unsigned int max_size; |
569410ca | 2182 | unsigned int copy_align; |
04afde45 | 2183 | struct dma_chan *rx_chan, *tx_chan; |
282a2fee | 2184 | |
186f27ff JM |
2185 | if (!qp) |
2186 | return 0; | |
2187 | ||
04afde45 DJ |
2188 | rx_chan = qp->rx_dma_chan; |
2189 | tx_chan = qp->tx_dma_chan; | |
282a2fee | 2190 | |
04afde45 DJ |
2191 | copy_align = max(rx_chan ? rx_chan->device->copy_align : 0, |
2192 | tx_chan ? tx_chan->device->copy_align : 0); | |
569410ca | 2193 | |
282a2fee | 2194 | /* If DMA engine usage is possible, try to find the max size for that */ |
04afde45 DJ |
2195 | max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header); |
2196 | max_size = round_down(max_size, 1 << copy_align); | |
282a2fee | 2197 | |
04afde45 | 2198 | return max_size; |
fce8a7bb JM |
2199 | } |
2200 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 | 2201 | |
e74bfeed DJ |
2202 | unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp) |
2203 | { | |
2204 | unsigned int head = qp->tx_index; | |
2205 | unsigned int tail = qp->remote_rx_info->entry; | |
2206 | ||
2207 | return tail > head ? tail - head : qp->tx_max_entry + tail - head; | |
2208 | } | |
2209 | EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry); | |
2210 | ||
e26a5843 AH |
2211 | static void ntb_transport_doorbell_callback(void *data, int vector) |
2212 | { | |
2213 | struct ntb_transport_ctx *nt = data; | |
2214 | struct ntb_transport_qp *qp; | |
2215 | u64 db_bits; | |
2216 | unsigned int qp_num; | |
2217 | ||
2218 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
2219 | ntb_db_vector_mask(nt->ndev, vector)); | |
2220 | ||
2221 | while (db_bits) { | |
2222 | qp_num = __ffs(db_bits); | |
2223 | qp = &nt->qp_vec[qp_num]; | |
2224 | ||
e9021331 DJ |
2225 | if (qp->active) |
2226 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
2227 | |
2228 | db_bits &= ~BIT_ULL(qp_num); | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
2233 | .link_event = ntb_transport_event_callback, | |
2234 | .db_event = ntb_transport_doorbell_callback, | |
2235 | }; | |
2236 | ||
2237 | static struct ntb_client ntb_transport_client = { | |
2238 | .ops = { | |
2239 | .probe = ntb_transport_probe, | |
2240 | .remove = ntb_transport_free, | |
2241 | }, | |
2242 | }; | |
2243 | ||
2244 | static int __init ntb_transport_init(void) | |
2245 | { | |
2246 | int rc; | |
2247 | ||
7eb38781 DJ |
2248 | pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
2249 | ||
e26a5843 AH |
2250 | if (debugfs_initialized()) |
2251 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
2252 | ||
2253 | rc = bus_register(&ntb_transport_bus); | |
2254 | if (rc) | |
2255 | goto err_bus; | |
2256 | ||
2257 | rc = ntb_register_client(&ntb_transport_client); | |
2258 | if (rc) | |
2259 | goto err_client; | |
2260 | ||
2261 | return 0; | |
2262 | ||
2263 | err_client: | |
2264 | bus_unregister(&ntb_transport_bus); | |
2265 | err_bus: | |
2266 | debugfs_remove_recursive(nt_debugfs_dir); | |
2267 | return rc; | |
2268 | } | |
2269 | module_init(ntb_transport_init); | |
2270 | ||
2271 | static void __exit ntb_transport_exit(void) | |
2272 | { | |
2273 | debugfs_remove_recursive(nt_debugfs_dir); | |
2274 | ||
2275 | ntb_unregister_client(&ntb_transport_client); | |
2276 | bus_unregister(&ntb_transport_bus); | |
2277 | } | |
2278 | module_exit(ntb_transport_exit); |