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; | |
282a2fee JM |
105 | |
106 | struct ntb_transport_qp *qp; | |
107 | union { | |
108 | struct ntb_payload_header __iomem *tx_hdr; | |
109 | struct ntb_payload_header *rx_hdr; | |
110 | }; | |
111 | unsigned int index; | |
fce8a7bb JM |
112 | }; |
113 | ||
793c20e9 JM |
114 | struct ntb_rx_info { |
115 | unsigned int entry; | |
116 | }; | |
117 | ||
fce8a7bb | 118 | struct ntb_transport_qp { |
e26a5843 AH |
119 | struct ntb_transport_ctx *transport; |
120 | struct ntb_dev *ndev; | |
fce8a7bb | 121 | void *cb_data; |
282a2fee | 122 | struct dma_chan *dma_chan; |
fce8a7bb JM |
123 | |
124 | bool client_ready; | |
e26a5843 AH |
125 | bool link_is_up; |
126 | ||
fce8a7bb | 127 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 128 | u64 qp_bit; |
fce8a7bb | 129 | |
74465645 | 130 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
131 | struct ntb_rx_info *remote_rx_info; |
132 | ||
53ca4fea JM |
133 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
134 | void *data, int len); | |
fce8a7bb JM |
135 | struct list_head tx_free_q; |
136 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 137 | void __iomem *tx_mw; |
282a2fee | 138 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
139 | unsigned int tx_index; |
140 | unsigned int tx_max_entry; | |
ef114ed5 | 141 | unsigned int tx_max_frame; |
fce8a7bb | 142 | |
53ca4fea JM |
143 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
144 | void *data, int len); | |
da2e5ae5 | 145 | struct list_head rx_post_q; |
fce8a7bb JM |
146 | struct list_head rx_pend_q; |
147 | struct list_head rx_free_q; | |
da2e5ae5 AH |
148 | /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */ |
149 | spinlock_t ntb_rx_q_lock; | |
793c20e9 JM |
150 | void *rx_buff; |
151 | unsigned int rx_index; | |
152 | unsigned int rx_max_entry; | |
ef114ed5 | 153 | unsigned int rx_max_frame; |
282a2fee | 154 | dma_cookie_t last_cookie; |
e26a5843 | 155 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 156 | |
53ca4fea | 157 | void (*event_handler)(void *data, int status); |
fce8a7bb | 158 | struct delayed_work link_work; |
7b4f2d3c | 159 | struct work_struct link_cleanup; |
fce8a7bb JM |
160 | |
161 | struct dentry *debugfs_dir; | |
162 | struct dentry *debugfs_stats; | |
163 | ||
164 | /* Stats */ | |
165 | u64 rx_bytes; | |
166 | u64 rx_pkts; | |
167 | u64 rx_ring_empty; | |
168 | u64 rx_err_no_buf; | |
169 | u64 rx_err_oflow; | |
170 | u64 rx_err_ver; | |
282a2fee JM |
171 | u64 rx_memcpy; |
172 | u64 rx_async; | |
fce8a7bb JM |
173 | u64 tx_bytes; |
174 | u64 tx_pkts; | |
175 | u64 tx_ring_full; | |
282a2fee JM |
176 | u64 tx_err_no_buf; |
177 | u64 tx_memcpy; | |
178 | u64 tx_async; | |
fce8a7bb JM |
179 | }; |
180 | ||
181 | struct ntb_transport_mw { | |
e26a5843 AH |
182 | phys_addr_t phys_addr; |
183 | resource_size_t phys_size; | |
184 | resource_size_t xlat_align; | |
185 | resource_size_t xlat_align_size; | |
186 | void __iomem *vbase; | |
187 | size_t xlat_size; | |
188 | size_t buff_size; | |
fce8a7bb JM |
189 | void *virt_addr; |
190 | dma_addr_t dma_addr; | |
191 | }; | |
192 | ||
193 | struct ntb_transport_client_dev { | |
194 | struct list_head entry; | |
e26a5843 | 195 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
196 | struct device dev; |
197 | }; | |
198 | ||
e26a5843 | 199 | struct ntb_transport_ctx { |
fce8a7bb JM |
200 | struct list_head entry; |
201 | struct list_head client_devs; | |
202 | ||
e26a5843 AH |
203 | struct ntb_dev *ndev; |
204 | ||
205 | struct ntb_transport_mw *mw_vec; | |
206 | struct ntb_transport_qp *qp_vec; | |
207 | unsigned int mw_count; | |
208 | unsigned int qp_count; | |
209 | u64 qp_bitmap; | |
210 | u64 qp_bitmap_free; | |
211 | ||
212 | bool link_is_up; | |
fce8a7bb | 213 | struct delayed_work link_work; |
7b4f2d3c | 214 | struct work_struct link_cleanup; |
c8650fd0 DJ |
215 | |
216 | struct dentry *debugfs_node_dir; | |
fce8a7bb JM |
217 | }; |
218 | ||
219 | enum { | |
e26a5843 AH |
220 | DESC_DONE_FLAG = BIT(0), |
221 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
222 | }; |
223 | ||
224 | struct ntb_payload_header { | |
74465645 | 225 | unsigned int ver; |
fce8a7bb JM |
226 | unsigned int len; |
227 | unsigned int flags; | |
228 | }; | |
229 | ||
230 | enum { | |
231 | VERSION = 0, | |
fce8a7bb | 232 | QP_LINKS, |
113fc505 JM |
233 | NUM_QPS, |
234 | NUM_MWS, | |
235 | MW0_SZ_HIGH, | |
236 | MW0_SZ_LOW, | |
237 | MW1_SZ_HIGH, | |
238 | MW1_SZ_LOW, | |
fce8a7bb JM |
239 | MAX_SPAD, |
240 | }; | |
241 | ||
e26a5843 AH |
242 | #define dev_client_dev(__dev) \ |
243 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
244 | ||
245 | #define drv_client(__drv) \ | |
246 | container_of((__drv), struct ntb_transport_client, driver) | |
247 | ||
248 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
249 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
250 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
251 | ||
e26a5843 AH |
252 | static void ntb_transport_rxc_db(unsigned long data); |
253 | static const struct ntb_ctx_ops ntb_transport_ops; | |
254 | static struct ntb_client ntb_transport_client; | |
255 | ||
256 | static int ntb_transport_bus_match(struct device *dev, | |
257 | struct device_driver *drv) | |
fce8a7bb JM |
258 | { |
259 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
260 | } | |
261 | ||
e26a5843 | 262 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 263 | { |
e26a5843 | 264 | const struct ntb_transport_client *client; |
fce8a7bb JM |
265 | int rc = -EINVAL; |
266 | ||
267 | get_device(dev); | |
e26a5843 AH |
268 | |
269 | client = drv_client(dev->driver); | |
270 | rc = client->probe(dev); | |
fce8a7bb JM |
271 | if (rc) |
272 | put_device(dev); | |
273 | ||
274 | return rc; | |
275 | } | |
276 | ||
e26a5843 | 277 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 278 | { |
e26a5843 | 279 | const struct ntb_transport_client *client; |
fce8a7bb | 280 | |
e26a5843 AH |
281 | client = drv_client(dev->driver); |
282 | client->remove(dev); | |
fce8a7bb JM |
283 | |
284 | put_device(dev); | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
e26a5843 AH |
289 | static struct bus_type ntb_transport_bus = { |
290 | .name = "ntb_transport", | |
291 | .match = ntb_transport_bus_match, | |
292 | .probe = ntb_transport_bus_probe, | |
293 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
294 | }; |
295 | ||
296 | static LIST_HEAD(ntb_transport_list); | |
297 | ||
e26a5843 | 298 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 299 | { |
fce8a7bb | 300 | list_add(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
301 | return 0; |
302 | } | |
303 | ||
e26a5843 | 304 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
305 | { |
306 | struct ntb_transport_client_dev *client_dev, *cd; | |
307 | ||
308 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
309 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
310 | dev_name(&client_dev->dev)); | |
311 | list_del(&client_dev->entry); | |
312 | device_unregister(&client_dev->dev); | |
313 | } | |
314 | ||
315 | list_del(&nt->entry); | |
fce8a7bb JM |
316 | } |
317 | ||
e26a5843 | 318 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
319 | { |
320 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 321 | |
e26a5843 | 322 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
323 | kfree(client_dev); |
324 | } | |
325 | ||
326 | /** | |
e26a5843 | 327 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
328 | * @device_name: Name of NTB client device |
329 | * | |
330 | * Unregister an NTB client device with the NTB transport layer | |
331 | */ | |
e26a5843 | 332 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
333 | { |
334 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 335 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
336 | |
337 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
338 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
339 | if (!strncmp(dev_name(&client->dev), device_name, | |
340 | strlen(device_name))) { | |
341 | list_del(&client->entry); | |
342 | device_unregister(&client->dev); | |
343 | } | |
344 | } | |
e26a5843 | 345 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
346 | |
347 | /** | |
e26a5843 | 348 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
349 | * @device_name: Name of NTB client device |
350 | * | |
351 | * Register an NTB client device with the NTB transport layer | |
352 | */ | |
e26a5843 | 353 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
354 | { |
355 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 356 | struct ntb_transport_ctx *nt; |
1199aa61 | 357 | int node; |
8b19d450 | 358 | int rc, i = 0; |
fce8a7bb | 359 | |
8222b402 JM |
360 | if (list_empty(&ntb_transport_list)) |
361 | return -ENODEV; | |
362 | ||
fce8a7bb JM |
363 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
364 | struct device *dev; | |
365 | ||
1199aa61 AH |
366 | node = dev_to_node(&nt->ndev->dev); |
367 | ||
368 | client_dev = kzalloc_node(sizeof(*client_dev), | |
369 | GFP_KERNEL, node); | |
fce8a7bb JM |
370 | if (!client_dev) { |
371 | rc = -ENOMEM; | |
372 | goto err; | |
373 | } | |
374 | ||
375 | dev = &client_dev->dev; | |
376 | ||
377 | /* setup and register client devices */ | |
8b19d450 | 378 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
379 | dev->bus = &ntb_transport_bus; |
380 | dev->release = ntb_transport_client_release; | |
381 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
382 | |
383 | rc = device_register(dev); | |
384 | if (rc) { | |
385 | kfree(client_dev); | |
386 | goto err; | |
387 | } | |
388 | ||
389 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 390 | i++; |
fce8a7bb JM |
391 | } |
392 | ||
393 | return 0; | |
394 | ||
395 | err: | |
e26a5843 | 396 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
397 | |
398 | return rc; | |
399 | } | |
e26a5843 | 400 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
401 | |
402 | /** | |
ec110bc7 | 403 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
404 | * @drv: NTB client driver to be registered |
405 | * | |
406 | * Register an NTB client driver with the NTB transport layer | |
407 | * | |
408 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
409 | */ | |
e26a5843 | 410 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 411 | { |
e26a5843 | 412 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 413 | |
8222b402 JM |
414 | if (list_empty(&ntb_transport_list)) |
415 | return -ENODEV; | |
416 | ||
fce8a7bb JM |
417 | return driver_register(&drv->driver); |
418 | } | |
ec110bc7 | 419 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
420 | |
421 | /** | |
ec110bc7 | 422 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
423 | * @drv: NTB client driver to be unregistered |
424 | * | |
425 | * Unregister an NTB client driver with the NTB transport layer | |
426 | * | |
427 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
428 | */ | |
e26a5843 | 429 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
430 | { |
431 | driver_unregister(&drv->driver); | |
432 | } | |
ec110bc7 | 433 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 434 | |
fce8a7bb JM |
435 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
436 | loff_t *offp) | |
437 | { | |
438 | struct ntb_transport_qp *qp; | |
d7237e22 | 439 | char *buf; |
fce8a7bb JM |
440 | ssize_t ret, out_offset, out_count; |
441 | ||
260bee94 DJ |
442 | qp = filp->private_data; |
443 | ||
444 | if (!qp || !qp->link_is_up) | |
445 | return 0; | |
446 | ||
282a2fee | 447 | out_count = 1000; |
d7237e22 JM |
448 | |
449 | buf = kmalloc(out_count, GFP_KERNEL); | |
450 | if (!buf) | |
451 | return -ENOMEM; | |
fce8a7bb | 452 | |
fce8a7bb JM |
453 | out_offset = 0; |
454 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
455 | "NTB QP stats\n"); | |
456 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
457 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
458 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
459 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
460 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
461 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
462 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
463 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
464 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
465 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
466 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
467 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
468 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
469 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
470 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
471 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
472 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 473 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 474 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 475 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 476 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 477 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
478 | |
479 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
480 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
481 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
482 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
483 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
484 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
485 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
486 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
487 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
488 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
489 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
490 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 491 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 492 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 493 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 494 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 495 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 496 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
e74bfeed DJ |
497 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
498 | "qp->remote_rx_info->entry - \t%u\n", | |
499 | qp->remote_rx_info->entry); | |
500 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
501 | "free tx - \t%u\n", | |
502 | ntb_transport_tx_free_entry(qp)); | |
fce8a7bb JM |
503 | |
504 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
e26a5843 AH |
505 | "\nQP Link %s\n", |
506 | qp->link_is_up ? "Up" : "Down"); | |
d7237e22 JM |
507 | if (out_offset > out_count) |
508 | out_offset = out_count; | |
fce8a7bb JM |
509 | |
510 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 511 | kfree(buf); |
fce8a7bb JM |
512 | return ret; |
513 | } | |
514 | ||
515 | static const struct file_operations ntb_qp_debugfs_stats = { | |
516 | .owner = THIS_MODULE, | |
d66d7ac2 | 517 | .open = simple_open, |
fce8a7bb JM |
518 | .read = debugfs_read, |
519 | }; | |
520 | ||
521 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
522 | struct list_head *list) | |
523 | { | |
524 | unsigned long flags; | |
525 | ||
526 | spin_lock_irqsave(lock, flags); | |
527 | list_add_tail(entry, list); | |
528 | spin_unlock_irqrestore(lock, flags); | |
529 | } | |
530 | ||
531 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 532 | struct list_head *list) |
fce8a7bb JM |
533 | { |
534 | struct ntb_queue_entry *entry; | |
535 | unsigned long flags; | |
536 | ||
537 | spin_lock_irqsave(lock, flags); | |
538 | if (list_empty(list)) { | |
539 | entry = NULL; | |
540 | goto out; | |
541 | } | |
542 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
543 | list_del(&entry->entry); | |
e74bfeed | 544 | |
fce8a7bb JM |
545 | out: |
546 | spin_unlock_irqrestore(lock, flags); | |
547 | ||
548 | return entry; | |
549 | } | |
550 | ||
da2e5ae5 AH |
551 | static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock, |
552 | struct list_head *list, | |
553 | struct list_head *to_list) | |
554 | { | |
555 | struct ntb_queue_entry *entry; | |
556 | unsigned long flags; | |
557 | ||
558 | spin_lock_irqsave(lock, flags); | |
559 | ||
560 | if (list_empty(list)) { | |
561 | entry = NULL; | |
562 | } else { | |
563 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
564 | list_move_tail(&entry->entry, to_list); | |
565 | } | |
566 | ||
567 | spin_unlock_irqrestore(lock, flags); | |
568 | ||
569 | return entry; | |
570 | } | |
571 | ||
e26a5843 AH |
572 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
573 | unsigned int qp_num) | |
fce8a7bb | 574 | { |
e26a5843 AH |
575 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
576 | struct ntb_transport_mw *mw; | |
ef114ed5 | 577 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 578 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 579 | unsigned int i; |
fce8a7bb | 580 | |
e26a5843 AH |
581 | mw_count = nt->mw_count; |
582 | qp_count = nt->qp_count; | |
948d3a65 | 583 | |
e26a5843 AH |
584 | mw_num = QP_TO_MW(nt, qp_num); |
585 | mw = &nt->mw_vec[mw_num]; | |
586 | ||
587 | if (!mw->virt_addr) | |
588 | return -ENOMEM; | |
fce8a7bb | 589 | |
e26a5843 AH |
590 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
591 | num_qps_mw = qp_count / mw_count + 1; | |
fce8a7bb | 592 | else |
e26a5843 | 593 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 594 | |
e26a5843 AH |
595 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
596 | qp->rx_buff = mw->virt_addr + rx_size * qp_num / mw_count; | |
793c20e9 JM |
597 | rx_size -= sizeof(struct ntb_rx_info); |
598 | ||
282a2fee JM |
599 | qp->remote_rx_info = qp->rx_buff + rx_size; |
600 | ||
c9d534c8 JM |
601 | /* Due to housekeeping, there must be atleast 2 buffs */ |
602 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
603 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
604 | qp->rx_index = 0; | |
605 | ||
c9d534c8 | 606 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 607 | |
ef114ed5 | 608 | /* setup the hdr offsets with 0's */ |
793c20e9 | 609 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
610 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
611 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 612 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 613 | } |
fce8a7bb JM |
614 | |
615 | qp->rx_pkts = 0; | |
616 | qp->tx_pkts = 0; | |
90f9e934 | 617 | qp->tx_index = 0; |
e26a5843 AH |
618 | |
619 | return 0; | |
fce8a7bb JM |
620 | } |
621 | ||
e26a5843 | 622 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 623 | { |
e26a5843 AH |
624 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
625 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
626 | |
627 | if (!mw->virt_addr) | |
628 | return; | |
629 | ||
e26a5843 AH |
630 | ntb_mw_clear_trans(nt->ndev, num_mw); |
631 | dma_free_coherent(&pdev->dev, mw->buff_size, | |
632 | mw->virt_addr, mw->dma_addr); | |
633 | mw->xlat_size = 0; | |
634 | mw->buff_size = 0; | |
b77b2637 JM |
635 | mw->virt_addr = NULL; |
636 | } | |
637 | ||
e26a5843 | 638 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
8c9edf63 | 639 | resource_size_t size) |
fce8a7bb | 640 | { |
e26a5843 AH |
641 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
642 | struct pci_dev *pdev = nt->ndev->pdev; | |
8c9edf63 | 643 | size_t xlat_size, buff_size; |
e26a5843 AH |
644 | int rc; |
645 | ||
8c9edf63 AH |
646 | if (!size) |
647 | return -EINVAL; | |
648 | ||
e26a5843 AH |
649 | xlat_size = round_up(size, mw->xlat_align_size); |
650 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 651 | |
b77b2637 | 652 | /* No need to re-setup */ |
e26a5843 | 653 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
654 | return 0; |
655 | ||
e26a5843 | 656 | if (mw->buff_size) |
b77b2637 JM |
657 | ntb_free_mw(nt, num_mw); |
658 | ||
e26a5843 AH |
659 | /* Alloc memory for receiving data. Must be aligned */ |
660 | mw->xlat_size = xlat_size; | |
661 | mw->buff_size = buff_size; | |
fce8a7bb | 662 | |
e26a5843 AH |
663 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
664 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 665 | if (!mw->virt_addr) { |
e26a5843 AH |
666 | mw->xlat_size = 0; |
667 | mw->buff_size = 0; | |
8c9edf63 | 668 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %zu\n", |
e26a5843 | 669 | buff_size); |
fce8a7bb JM |
670 | return -ENOMEM; |
671 | } | |
672 | ||
3cc5ba19 DJ |
673 | /* |
674 | * we must ensure that the memory address allocated is BAR size | |
675 | * aligned in order for the XLAT register to take the value. This | |
676 | * is a requirement of the hardware. It is recommended to setup CMA | |
677 | * for BAR sizes equal or greater than 4MB. | |
678 | */ | |
e26a5843 AH |
679 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
680 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
681 | &mw->dma_addr); |
682 | ntb_free_mw(nt, num_mw); | |
683 | return -ENOMEM; | |
684 | } | |
685 | ||
fce8a7bb | 686 | /* Notify HW the memory location of the receive buffer */ |
e26a5843 AH |
687 | rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
688 | if (rc) { | |
689 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
690 | ntb_free_mw(nt, num_mw); | |
691 | return -EIO; | |
692 | } | |
fce8a7bb JM |
693 | |
694 | return 0; | |
695 | } | |
696 | ||
2849b5d7 AH |
697 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
698 | { | |
699 | qp->link_is_up = false; | |
700 | ||
701 | qp->tx_index = 0; | |
702 | qp->rx_index = 0; | |
703 | qp->rx_bytes = 0; | |
704 | qp->rx_pkts = 0; | |
705 | qp->rx_ring_empty = 0; | |
706 | qp->rx_err_no_buf = 0; | |
707 | qp->rx_err_oflow = 0; | |
708 | qp->rx_err_ver = 0; | |
709 | qp->rx_memcpy = 0; | |
710 | qp->rx_async = 0; | |
711 | qp->tx_bytes = 0; | |
712 | qp->tx_pkts = 0; | |
713 | qp->tx_ring_full = 0; | |
714 | qp->tx_err_no_buf = 0; | |
715 | qp->tx_memcpy = 0; | |
716 | qp->tx_async = 0; | |
717 | } | |
718 | ||
fca4d518 | 719 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 720 | { |
e26a5843 AH |
721 | struct ntb_transport_ctx *nt = qp->transport; |
722 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 723 | |
e22e0b9d | 724 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
725 | |
726 | cancel_delayed_work_sync(&qp->link_work); | |
727 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
728 | |
729 | if (qp->event_handler) | |
730 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
731 | } |
732 | ||
733 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
734 | { | |
735 | struct ntb_transport_qp *qp = container_of(work, | |
736 | struct ntb_transport_qp, | |
737 | link_cleanup); | |
e26a5843 | 738 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
739 | |
740 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 741 | |
e26a5843 | 742 | if (nt->link_is_up) |
fce8a7bb JM |
743 | schedule_delayed_work(&qp->link_work, |
744 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
745 | } | |
746 | ||
7b4f2d3c JM |
747 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
748 | { | |
749 | schedule_work(&qp->link_cleanup); | |
750 | } | |
751 | ||
e26a5843 | 752 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 753 | { |
e26a5843 AH |
754 | struct ntb_transport_qp *qp; |
755 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
756 | int i; |
757 | ||
e26a5843 AH |
758 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
759 | ||
fca4d518 | 760 | /* Pass along the info to any clients */ |
e26a5843 AH |
761 | for (i = 0; i < nt->qp_count; i++) |
762 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
763 | qp = &nt->qp_vec[i]; | |
764 | ntb_qp_link_cleanup(qp); | |
765 | cancel_work_sync(&qp->link_cleanup); | |
766 | cancel_delayed_work_sync(&qp->link_work); | |
767 | } | |
fca4d518 | 768 | |
e26a5843 | 769 | if (!nt->link_is_up) |
fce8a7bb | 770 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 771 | |
fce8a7bb JM |
772 | /* The scratchpad registers keep the values if the remote side |
773 | * goes down, blast them now to give them a sane value the next | |
774 | * time they are accessed | |
775 | */ | |
776 | for (i = 0; i < MAX_SPAD; i++) | |
e26a5843 | 777 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
778 | } |
779 | ||
fca4d518 JM |
780 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
781 | { | |
e26a5843 AH |
782 | struct ntb_transport_ctx *nt = |
783 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
784 | |
785 | ntb_transport_link_cleanup(nt); | |
786 | } | |
787 | ||
e26a5843 | 788 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 789 | { |
e26a5843 | 790 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 791 | |
e26a5843 | 792 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 793 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 794 | else |
7b4f2d3c | 795 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
796 | } |
797 | ||
798 | static void ntb_transport_link_work(struct work_struct *work) | |
799 | { | |
e26a5843 AH |
800 | struct ntb_transport_ctx *nt = |
801 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
802 | struct ntb_dev *ndev = nt->ndev; | |
803 | struct pci_dev *pdev = ndev->pdev; | |
804 | resource_size_t size; | |
fce8a7bb | 805 | u32 val; |
e26a5843 | 806 | int rc, i, spad; |
fce8a7bb | 807 | |
113fc505 | 808 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
809 | for (i = 0; i < nt->mw_count; i++) { |
810 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 811 | |
e26a5843 AH |
812 | if (max_mw_size && size > max_mw_size) |
813 | size = max_mw_size; | |
fce8a7bb | 814 | |
e26a5843 AH |
815 | spad = MW0_SZ_HIGH + (i * 2); |
816 | ntb_peer_spad_write(ndev, spad, (u32)(size >> 32)); | |
fce8a7bb | 817 | |
e26a5843 AH |
818 | spad = MW0_SZ_LOW + (i * 2); |
819 | ntb_peer_spad_write(ndev, spad, (u32)size); | |
fce8a7bb JM |
820 | } |
821 | ||
e26a5843 | 822 | ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
fce8a7bb | 823 | |
e26a5843 | 824 | ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
fce8a7bb | 825 | |
e26a5843 | 826 | ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 827 | |
e26a5843 | 828 | /* Query the remote side for its info */ |
0f69a7df | 829 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
830 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
831 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 832 | goto out; |
fce8a7bb | 833 | |
0f69a7df | 834 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 835 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 836 | if (val != nt->qp_count) |
fce8a7bb | 837 | goto out; |
fce8a7bb | 838 | |
0f69a7df | 839 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 840 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
841 | if (val != nt->mw_count) |
842 | goto out; | |
fce8a7bb | 843 | |
e26a5843 | 844 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 845 | u64 val64; |
fce8a7bb | 846 | |
0f69a7df | 847 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 848 | val64 = (u64)val << 32; |
113fc505 | 849 | |
0f69a7df | 850 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
851 | val64 |= val; |
852 | ||
e26a5843 | 853 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
854 | |
855 | rc = ntb_set_mw(nt, i, val64); | |
856 | if (rc) | |
857 | goto out1; | |
858 | } | |
fce8a7bb | 859 | |
e26a5843 | 860 | nt->link_is_up = true; |
fce8a7bb | 861 | |
e26a5843 AH |
862 | for (i = 0; i < nt->qp_count; i++) { |
863 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
864 | |
865 | ntb_transport_setup_qp_mw(nt, i); | |
866 | ||
e26a5843 | 867 | if (qp->client_ready) |
fce8a7bb JM |
868 | schedule_delayed_work(&qp->link_work, 0); |
869 | } | |
870 | ||
871 | return; | |
872 | ||
113fc505 | 873 | out1: |
e26a5843 | 874 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 875 | ntb_free_mw(nt, i); |
fce8a7bb | 876 | out: |
e26a5843 | 877 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
878 | schedule_delayed_work(&nt->link_work, |
879 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
880 | } | |
881 | ||
882 | static void ntb_qp_link_work(struct work_struct *work) | |
883 | { | |
884 | struct ntb_transport_qp *qp = container_of(work, | |
885 | struct ntb_transport_qp, | |
886 | link_work.work); | |
e26a5843 AH |
887 | struct pci_dev *pdev = qp->ndev->pdev; |
888 | struct ntb_transport_ctx *nt = qp->transport; | |
889 | int val; | |
fce8a7bb | 890 | |
e26a5843 | 891 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 892 | |
e26a5843 | 893 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 894 | |
e26a5843 | 895 | ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
896 | |
897 | /* query remote spad for qp ready bits */ | |
e26a5843 | 898 | ntb_peer_spad_read(nt->ndev, QP_LINKS); |
28762289 | 899 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
900 | |
901 | /* See if the remote side is up */ | |
e26a5843 | 902 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 903 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 AH |
904 | qp->link_is_up = true; |
905 | ||
fce8a7bb | 906 | if (qp->event_handler) |
e26a5843 | 907 | qp->event_handler(qp->cb_data, qp->link_is_up); |
8b5a22d8 AH |
908 | |
909 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 910 | } else if (nt->link_is_up) |
fce8a7bb JM |
911 | schedule_delayed_work(&qp->link_work, |
912 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
913 | } | |
914 | ||
e26a5843 | 915 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 916 | unsigned int qp_num) |
fce8a7bb JM |
917 | { |
918 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
919 | struct ntb_transport_mw *mw; |
920 | phys_addr_t mw_base; | |
921 | resource_size_t mw_size; | |
ef114ed5 | 922 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 923 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 924 | u64 qp_offset; |
948d3a65 | 925 | |
e26a5843 AH |
926 | mw_count = nt->mw_count; |
927 | qp_count = nt->qp_count; | |
fce8a7bb | 928 | |
e26a5843 AH |
929 | mw_num = QP_TO_MW(nt, qp_num); |
930 | mw = &nt->mw_vec[mw_num]; | |
931 | ||
932 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
933 | qp->qp_num = qp_num; |
934 | qp->transport = nt; | |
935 | qp->ndev = nt->ndev; | |
e26a5843 | 936 | qp->client_ready = false; |
fce8a7bb | 937 | qp->event_handler = NULL; |
2849b5d7 | 938 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 939 | |
e26a5843 AH |
940 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
941 | num_qps_mw = qp_count / mw_count + 1; | |
ef114ed5 | 942 | else |
e26a5843 AH |
943 | num_qps_mw = qp_count / mw_count; |
944 | ||
945 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
946 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 947 | |
e26a5843 AH |
948 | tx_size = (unsigned int)mw_size / num_qps_mw; |
949 | qp_offset = tx_size * qp_num / mw_count; | |
950 | ||
951 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
952 | if (!qp->tx_mw) |
953 | return -EINVAL; | |
954 | ||
e26a5843 | 955 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
956 | if (!qp->tx_mw_phys) |
957 | return -EINVAL; | |
958 | ||
793c20e9 | 959 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 960 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 961 | |
c9d534c8 JM |
962 | /* Due to housekeeping, there must be atleast 2 buffs */ |
963 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 964 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 965 | |
c8650fd0 | 966 | if (nt->debugfs_node_dir) { |
fce8a7bb JM |
967 | char debugfs_name[4]; |
968 | ||
969 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
970 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
c8650fd0 | 971 | nt->debugfs_node_dir); |
fce8a7bb JM |
972 | |
973 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
974 | qp->debugfs_dir, qp, | |
975 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
976 | } else { |
977 | qp->debugfs_dir = NULL; | |
978 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
979 | } |
980 | ||
981 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 982 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb | 983 | |
da2e5ae5 | 984 | spin_lock_init(&qp->ntb_rx_q_lock); |
fce8a7bb JM |
985 | spin_lock_init(&qp->ntb_tx_free_q_lock); |
986 | ||
da2e5ae5 | 987 | INIT_LIST_HEAD(&qp->rx_post_q); |
fce8a7bb JM |
988 | INIT_LIST_HEAD(&qp->rx_pend_q); |
989 | INIT_LIST_HEAD(&qp->rx_free_q); | |
990 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 991 | |
e26a5843 AH |
992 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
993 | (unsigned long)qp); | |
994 | ||
282a2fee | 995 | return 0; |
fce8a7bb JM |
996 | } |
997 | ||
e26a5843 | 998 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 999 | { |
e26a5843 AH |
1000 | struct ntb_transport_ctx *nt; |
1001 | struct ntb_transport_mw *mw; | |
1002 | unsigned int mw_count, qp_count; | |
1003 | u64 qp_bitmap; | |
1199aa61 | 1004 | int node; |
fce8a7bb JM |
1005 | int rc, i; |
1006 | ||
e26a5843 AH |
1007 | if (ntb_db_is_unsafe(ndev)) |
1008 | dev_dbg(&ndev->dev, | |
1009 | "doorbell is unsafe, proceed anyway...\n"); | |
1010 | if (ntb_spad_is_unsafe(ndev)) | |
1011 | dev_dbg(&ndev->dev, | |
1012 | "scratchpad is unsafe, proceed anyway...\n"); | |
1013 | ||
1199aa61 AH |
1014 | node = dev_to_node(&ndev->dev); |
1015 | ||
1016 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
1017 | if (!nt) |
1018 | return -ENOMEM; | |
1019 | ||
e26a5843 AH |
1020 | nt->ndev = ndev; |
1021 | ||
1022 | mw_count = ntb_mw_count(ndev); | |
1023 | ||
1024 | nt->mw_count = mw_count; | |
1025 | ||
1199aa61 AH |
1026 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
1027 | GFP_KERNEL, node); | |
e26a5843 AH |
1028 | if (!nt->mw_vec) { |
1029 | rc = -ENOMEM; | |
fce8a7bb JM |
1030 | goto err; |
1031 | } | |
1032 | ||
e26a5843 AH |
1033 | for (i = 0; i < mw_count; i++) { |
1034 | mw = &nt->mw_vec[i]; | |
1035 | ||
1036 | rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, | |
1037 | &mw->xlat_align, &mw->xlat_align_size); | |
1038 | if (rc) | |
1039 | goto err1; | |
1040 | ||
06917f75 | 1041 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
1042 | if (!mw->vbase) { |
1043 | rc = -ENOMEM; | |
1044 | goto err1; | |
1045 | } | |
1046 | ||
1047 | mw->buff_size = 0; | |
1048 | mw->xlat_size = 0; | |
1049 | mw->virt_addr = NULL; | |
1050 | mw->dma_addr = 0; | |
948d3a65 JM |
1051 | } |
1052 | ||
e26a5843 AH |
1053 | qp_bitmap = ntb_db_valid_mask(ndev); |
1054 | ||
1055 | qp_count = ilog2(qp_bitmap); | |
1056 | if (max_num_clients && max_num_clients < qp_count) | |
1057 | qp_count = max_num_clients; | |
1058 | else if (mw_count < qp_count) | |
1059 | qp_count = mw_count; | |
1060 | ||
1061 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1062 | ||
1063 | nt->qp_count = qp_count; | |
1064 | nt->qp_bitmap = qp_bitmap; | |
1065 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1066 | |
1199aa61 AH |
1067 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1068 | GFP_KERNEL, node); | |
e26a5843 | 1069 | if (!nt->qp_vec) { |
fce8a7bb | 1070 | rc = -ENOMEM; |
948d3a65 | 1071 | goto err2; |
fce8a7bb JM |
1072 | } |
1073 | ||
c8650fd0 DJ |
1074 | if (nt_debugfs_dir) { |
1075 | nt->debugfs_node_dir = | |
1076 | debugfs_create_dir(pci_name(ndev->pdev), | |
1077 | nt_debugfs_dir); | |
1078 | } | |
1079 | ||
e26a5843 | 1080 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1081 | rc = ntb_transport_init_queue(nt, i); |
1082 | if (rc) | |
1083 | goto err3; | |
1084 | } | |
fce8a7bb JM |
1085 | |
1086 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1087 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1088 | |
e26a5843 | 1089 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1090 | if (rc) |
948d3a65 | 1091 | goto err3; |
fce8a7bb JM |
1092 | |
1093 | INIT_LIST_HEAD(&nt->client_devs); | |
1094 | rc = ntb_bus_init(nt); | |
1095 | if (rc) | |
948d3a65 | 1096 | goto err4; |
fce8a7bb | 1097 | |
e26a5843 AH |
1098 | nt->link_is_up = false; |
1099 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1100 | ntb_link_event(ndev); | |
fce8a7bb JM |
1101 | |
1102 | return 0; | |
1103 | ||
948d3a65 | 1104 | err4: |
e26a5843 | 1105 | ntb_clear_ctx(ndev); |
948d3a65 | 1106 | err3: |
e26a5843 | 1107 | kfree(nt->qp_vec); |
948d3a65 | 1108 | err2: |
e26a5843 | 1109 | kfree(nt->mw_vec); |
fce8a7bb | 1110 | err1: |
e26a5843 AH |
1111 | while (i--) { |
1112 | mw = &nt->mw_vec[i]; | |
1113 | iounmap(mw->vbase); | |
1114 | } | |
fce8a7bb | 1115 | err: |
fce8a7bb JM |
1116 | kfree(nt); |
1117 | return rc; | |
1118 | } | |
1119 | ||
e26a5843 | 1120 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1121 | { |
e26a5843 AH |
1122 | struct ntb_transport_ctx *nt = ndev->ctx; |
1123 | struct ntb_transport_qp *qp; | |
1124 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1125 | int i; |
1126 | ||
fca4d518 | 1127 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1128 | cancel_work_sync(&nt->link_cleanup); |
1129 | cancel_delayed_work_sync(&nt->link_work); | |
1130 | ||
1131 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1132 | |
1133 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1134 | for (i = 0; i < nt->qp_count; i++) { |
1135 | qp = &nt->qp_vec[i]; | |
1136 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1137 | ntb_transport_free_queue(qp); | |
1138 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1139 | } |
fce8a7bb | 1140 | |
e26a5843 AH |
1141 | ntb_link_disable(ndev); |
1142 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1143 | |
e26a5843 | 1144 | ntb_bus_remove(nt); |
fce8a7bb | 1145 | |
e26a5843 | 1146 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1147 | ntb_free_mw(nt, i); |
e26a5843 AH |
1148 | iounmap(nt->mw_vec[i].vbase); |
1149 | } | |
fce8a7bb | 1150 | |
e26a5843 AH |
1151 | kfree(nt->qp_vec); |
1152 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1153 | kfree(nt); |
1154 | } | |
1155 | ||
da2e5ae5 | 1156 | static void ntb_complete_rxc(struct ntb_transport_qp *qp) |
fce8a7bb | 1157 | { |
da2e5ae5 AH |
1158 | struct ntb_queue_entry *entry; |
1159 | void *cb_data; | |
1160 | unsigned int len; | |
1161 | unsigned long irqflags; | |
1162 | ||
1163 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1164 | ||
1165 | while (!list_empty(&qp->rx_post_q)) { | |
1166 | entry = list_first_entry(&qp->rx_post_q, | |
1167 | struct ntb_queue_entry, entry); | |
1168 | if (!(entry->flags & DESC_DONE_FLAG)) | |
1169 | break; | |
1170 | ||
1171 | entry->rx_hdr->flags = 0; | |
1172 | iowrite32(entry->index, &qp->rx_info->entry); | |
1173 | ||
1174 | cb_data = entry->cb_data; | |
1175 | len = entry->len; | |
1176 | ||
1177 | list_move_tail(&entry->entry, &qp->rx_free_q); | |
1178 | ||
1179 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); | |
1180 | ||
1181 | if (qp->rx_handler && qp->client_ready) | |
1182 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
1183 | ||
1184 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1185 | } | |
282a2fee | 1186 | |
da2e5ae5 AH |
1187 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
1188 | } | |
fce8a7bb | 1189 | |
da2e5ae5 AH |
1190 | static void ntb_rx_copy_callback(void *data) |
1191 | { | |
1192 | struct ntb_queue_entry *entry = data; | |
fce8a7bb | 1193 | |
da2e5ae5 | 1194 | entry->flags |= DESC_DONE_FLAG; |
448c6fb3 | 1195 | |
da2e5ae5 | 1196 | ntb_complete_rxc(entry->qp); |
fce8a7bb JM |
1197 | } |
1198 | ||
282a2fee JM |
1199 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1200 | { | |
1201 | void *buf = entry->buf; | |
1202 | size_t len = entry->len; | |
1203 | ||
1204 | memcpy(buf, offset, len); | |
1205 | ||
e26a5843 AH |
1206 | /* Ensure that the data is fully copied out before clearing the flag */ |
1207 | wmb(); | |
1208 | ||
282a2fee JM |
1209 | ntb_rx_copy_callback(entry); |
1210 | } | |
1211 | ||
da2e5ae5 | 1212 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) |
282a2fee JM |
1213 | { |
1214 | struct dma_async_tx_descriptor *txd; | |
1215 | struct ntb_transport_qp *qp = entry->qp; | |
1216 | struct dma_chan *chan = qp->dma_chan; | |
1217 | struct dma_device *device; | |
da2e5ae5 | 1218 | size_t pay_off, buff_off, len; |
6f57fd05 | 1219 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1220 | dma_cookie_t cookie; |
1221 | void *buf = entry->buf; | |
282a2fee | 1222 | |
da2e5ae5 | 1223 | len = entry->len; |
282a2fee JM |
1224 | |
1225 | if (!chan) | |
1226 | goto err; | |
1227 | ||
53ca4fea | 1228 | if (len < copy_bytes) |
6f57fd05 | 1229 | goto err_wait; |
282a2fee JM |
1230 | |
1231 | device = chan->device; | |
e26a5843 AH |
1232 | pay_off = (size_t)offset & ~PAGE_MASK; |
1233 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1234 | |
1235 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
6f57fd05 | 1236 | goto err_wait; |
282a2fee | 1237 | |
6f57fd05 BZ |
1238 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1239 | if (!unmap) | |
1240 | goto err_wait; | |
282a2fee | 1241 | |
6f57fd05 BZ |
1242 | unmap->len = len; |
1243 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1244 | pay_off, len, DMA_TO_DEVICE); | |
1245 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1246 | goto err_get_unmap; | |
1247 | ||
1248 | unmap->to_cnt = 1; | |
282a2fee | 1249 | |
6f57fd05 BZ |
1250 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1251 | buff_off, len, DMA_FROM_DEVICE); | |
1252 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1253 | goto err_get_unmap; | |
1254 | ||
1255 | unmap->from_cnt = 1; | |
1256 | ||
6f57fd05 | 1257 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
0776ae7b BZ |
1258 | unmap->addr[0], len, |
1259 | DMA_PREP_INTERRUPT); | |
282a2fee | 1260 | if (!txd) |
6f57fd05 | 1261 | goto err_get_unmap; |
282a2fee JM |
1262 | |
1263 | txd->callback = ntb_rx_copy_callback; | |
1264 | txd->callback_param = entry; | |
6f57fd05 | 1265 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1266 | |
1267 | cookie = dmaengine_submit(txd); | |
1268 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1269 | goto err_set_unmap; |
1270 | ||
1271 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1272 | |
1273 | qp->last_cookie = cookie; | |
1274 | ||
1275 | qp->rx_async++; | |
1276 | ||
1277 | return; | |
1278 | ||
6f57fd05 BZ |
1279 | err_set_unmap: |
1280 | dmaengine_unmap_put(unmap); | |
1281 | err_get_unmap: | |
1282 | dmaengine_unmap_put(unmap); | |
1283 | err_wait: | |
282a2fee JM |
1284 | /* If the callbacks come out of order, the writing of the index to the |
1285 | * last completed will be out of order. This may result in the | |
1286 | * receive stalling forever. | |
1287 | */ | |
1288 | dma_sync_wait(chan, qp->last_cookie); | |
1289 | err: | |
1290 | ntb_memcpy_rx(entry, offset); | |
1291 | qp->rx_memcpy++; | |
1292 | } | |
1293 | ||
fce8a7bb JM |
1294 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1295 | { | |
1296 | struct ntb_payload_header *hdr; | |
1297 | struct ntb_queue_entry *entry; | |
1298 | void *offset; | |
1299 | ||
793c20e9 JM |
1300 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1301 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1302 | ||
e26a5843 AH |
1303 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1304 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1305 | |
fce8a7bb | 1306 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1307 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1308 | qp->rx_ring_empty++; |
1309 | return -EAGAIN; | |
1310 | } | |
1311 | ||
e26a5843 AH |
1312 | if (hdr->flags & LINK_DOWN_FLAG) { |
1313 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1314 | ntb_qp_link_down(qp); | |
1315 | hdr->flags = 0; | |
c0900b33 | 1316 | return -EAGAIN; |
e26a5843 AH |
1317 | } |
1318 | ||
1319 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1320 | dev_dbg(&qp->ndev->pdev->dev, | |
1321 | "version mismatch, expected %llu - got %u\n", | |
1322 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1323 | qp->rx_err_ver++; |
1324 | return -EIO; | |
1325 | } | |
1326 | ||
da2e5ae5 | 1327 | entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); |
e26a5843 AH |
1328 | if (!entry) { |
1329 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1330 | qp->rx_err_no_buf++; | |
da2e5ae5 | 1331 | return -EAGAIN; |
fce8a7bb JM |
1332 | } |
1333 | ||
da2e5ae5 AH |
1334 | entry->rx_hdr = hdr; |
1335 | entry->index = qp->rx_index; | |
1336 | ||
282a2fee | 1337 | if (hdr->len > entry->len) { |
e26a5843 AH |
1338 | dev_dbg(&qp->ndev->pdev->dev, |
1339 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1340 | hdr->len, entry->len); |
e26a5843 | 1341 | qp->rx_err_oflow++; |
282a2fee | 1342 | |
da2e5ae5 AH |
1343 | entry->len = -EIO; |
1344 | entry->flags |= DESC_DONE_FLAG; | |
fce8a7bb | 1345 | |
da2e5ae5 AH |
1346 | ntb_complete_rxc(qp); |
1347 | } else { | |
1348 | dev_dbg(&qp->ndev->pdev->dev, | |
1349 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1350 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
e26a5843 | 1351 | |
da2e5ae5 AH |
1352 | qp->rx_bytes += hdr->len; |
1353 | qp->rx_pkts++; | |
e26a5843 | 1354 | |
da2e5ae5 | 1355 | entry->len = hdr->len; |
282a2fee | 1356 | |
da2e5ae5 AH |
1357 | ntb_async_rx(entry, offset); |
1358 | } | |
fce8a7bb | 1359 | |
282a2fee JM |
1360 | qp->rx_index++; |
1361 | qp->rx_index %= qp->rx_max_entry; | |
1362 | ||
1363 | return 0; | |
fce8a7bb JM |
1364 | } |
1365 | ||
e26a5843 | 1366 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1367 | { |
e26a5843 | 1368 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1369 | int rc, i; |
fce8a7bb | 1370 | |
e26a5843 AH |
1371 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1372 | __func__, qp->qp_num); | |
e8aeb60c | 1373 | |
c336acd3 JM |
1374 | /* Limit the number of packets processed in a single interrupt to |
1375 | * provide fairness to others | |
1376 | */ | |
1377 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1378 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1379 | if (rc) |
1380 | break; | |
1381 | } | |
282a2fee | 1382 | |
da2e5ae5 | 1383 | if (i && qp->dma_chan) |
282a2fee | 1384 | dma_async_issue_pending(qp->dma_chan); |
fce8a7bb | 1385 | |
e26a5843 AH |
1386 | if (i == qp->rx_max_entry) { |
1387 | /* there is more work to do */ | |
1388 | tasklet_schedule(&qp->rxc_db_work); | |
1389 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { | |
1390 | /* the doorbell bit is set: clear it */ | |
1391 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1392 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1393 | ntb_db_read(qp->ndev); | |
1394 | ||
1395 | /* an interrupt may have arrived between finishing | |
1396 | * ntb_process_rxc and clearing the doorbell bit: | |
1397 | * there might be some more work to do. | |
1398 | */ | |
1399 | tasklet_schedule(&qp->rxc_db_work); | |
1400 | } | |
fce8a7bb JM |
1401 | } |
1402 | ||
282a2fee | 1403 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1404 | { |
282a2fee JM |
1405 | struct ntb_queue_entry *entry = data; |
1406 | struct ntb_transport_qp *qp = entry->qp; | |
1407 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1408 | |
74465645 | 1409 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1410 | |
e26a5843 | 1411 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1412 | |
1413 | /* The entry length can only be zero if the packet is intended to be a | |
1414 | * "link down" or similar. Since no payload is being sent in these | |
1415 | * cases, there is nothing to add to the completion queue. | |
1416 | */ | |
1417 | if (entry->len > 0) { | |
1418 | qp->tx_bytes += entry->len; | |
1419 | ||
1420 | if (qp->tx_handler) | |
1421 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1422 | entry->len); | |
1423 | } | |
1424 | ||
1425 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1426 | } | |
1427 | ||
282a2fee | 1428 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1429 | { |
06917f75 DJ |
1430 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1431 | /* | |
1432 | * Using non-temporal mov to improve performance on non-cached | |
1433 | * writes, even though we aren't actually copying from user space. | |
1434 | */ | |
1435 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1436 | #else | |
282a2fee | 1437 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1438 | #endif |
282a2fee | 1439 | |
e26a5843 AH |
1440 | /* Ensure that the data is fully copied out before setting the flags */ |
1441 | wmb(); | |
1442 | ||
282a2fee JM |
1443 | ntb_tx_copy_callback(entry); |
1444 | } | |
1445 | ||
1446 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1447 | struct ntb_queue_entry *entry) | |
1448 | { | |
1449 | struct ntb_payload_header __iomem *hdr; | |
1450 | struct dma_async_tx_descriptor *txd; | |
1451 | struct dma_chan *chan = qp->dma_chan; | |
1452 | struct dma_device *device; | |
1453 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1454 | struct dmaengine_unmap_data *unmap; |
1455 | dma_addr_t dest; | |
282a2fee | 1456 | dma_cookie_t cookie; |
74465645 | 1457 | void __iomem *offset; |
282a2fee JM |
1458 | size_t len = entry->len; |
1459 | void *buf = entry->buf; | |
fce8a7bb | 1460 | |
793c20e9 | 1461 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1462 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1463 | entry->tx_hdr = hdr; | |
fce8a7bb | 1464 | |
282a2fee | 1465 | iowrite32(entry->len, &hdr->len); |
e26a5843 | 1466 | iowrite32((u32)qp->tx_pkts, &hdr->ver); |
282a2fee JM |
1467 | |
1468 | if (!chan) | |
1469 | goto err; | |
1470 | ||
1471 | if (len < copy_bytes) | |
1472 | goto err; | |
1473 | ||
1474 | device = chan->device; | |
1475 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
e26a5843 AH |
1476 | buff_off = (size_t)buf & ~PAGE_MASK; |
1477 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1478 | |
1479 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1480 | goto err; | |
1481 | ||
6f57fd05 BZ |
1482 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1483 | if (!unmap) | |
282a2fee JM |
1484 | goto err; |
1485 | ||
6f57fd05 BZ |
1486 | unmap->len = len; |
1487 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1488 | buff_off, len, DMA_TO_DEVICE); | |
1489 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1490 | goto err_get_unmap; | |
1491 | ||
1492 | unmap->to_cnt = 1; | |
1493 | ||
6f57fd05 | 1494 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
0776ae7b | 1495 | DMA_PREP_INTERRUPT); |
282a2fee | 1496 | if (!txd) |
6f57fd05 | 1497 | goto err_get_unmap; |
282a2fee JM |
1498 | |
1499 | txd->callback = ntb_tx_copy_callback; | |
1500 | txd->callback_param = entry; | |
6f57fd05 | 1501 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1502 | |
1503 | cookie = dmaengine_submit(txd); | |
1504 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1505 | goto err_set_unmap; |
1506 | ||
1507 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1508 | |
1509 | dma_async_issue_pending(chan); | |
1510 | qp->tx_async++; | |
1511 | ||
1512 | return; | |
6f57fd05 BZ |
1513 | err_set_unmap: |
1514 | dmaengine_unmap_put(unmap); | |
1515 | err_get_unmap: | |
1516 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1517 | err: |
1518 | ntb_memcpy_tx(entry, offset); | |
1519 | qp->tx_memcpy++; | |
1520 | } | |
1521 | ||
1522 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1523 | struct ntb_queue_entry *entry) | |
1524 | { | |
793c20e9 | 1525 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1526 | qp->tx_ring_full++; |
1527 | return -EAGAIN; | |
1528 | } | |
1529 | ||
ef114ed5 | 1530 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1531 | if (qp->tx_handler) |
1532 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1533 | ||
1534 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1535 | &qp->tx_free_q); | |
1536 | return 0; | |
1537 | } | |
1538 | ||
282a2fee | 1539 | ntb_async_tx(qp, entry); |
fce8a7bb | 1540 | |
793c20e9 JM |
1541 | qp->tx_index++; |
1542 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1543 | |
1544 | qp->tx_pkts++; | |
1545 | ||
1546 | return 0; | |
1547 | } | |
1548 | ||
1549 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1550 | { | |
e26a5843 | 1551 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1552 | struct ntb_queue_entry *entry; |
1553 | int i, rc; | |
1554 | ||
e26a5843 | 1555 | if (!qp->link_is_up) |
fce8a7bb JM |
1556 | return; |
1557 | ||
e22e0b9d | 1558 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1559 | |
1560 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1561 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1562 | if (entry) |
1563 | break; | |
1564 | msleep(100); | |
1565 | } | |
1566 | ||
1567 | if (!entry) | |
1568 | return; | |
1569 | ||
1570 | entry->cb_data = NULL; | |
1571 | entry->buf = NULL; | |
1572 | entry->len = 0; | |
1573 | entry->flags = LINK_DOWN_FLAG; | |
1574 | ||
1575 | rc = ntb_process_tx(qp, entry); | |
1576 | if (rc) | |
1577 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1578 | qp->qp_num); | |
2849b5d7 AH |
1579 | |
1580 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1581 | } |
1582 | ||
1199aa61 AH |
1583 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1584 | { | |
1585 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1586 | } | |
1587 | ||
fce8a7bb JM |
1588 | /** |
1589 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1590 | * @rx_handler: receive callback function | |
1591 | * @tx_handler: transmit callback function | |
1592 | * @event_handler: event callback function | |
1593 | * | |
1594 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1595 | * routine for both transmit and receive. The receive callback routine will be | |
1596 | * used to pass up data when the transport has received it on the queue. The | |
1597 | * transmit callback routine will be called when the transport has completed the | |
1598 | * transmission of the data on the queue and the data is ready to be freed. | |
1599 | * | |
1600 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1601 | */ | |
1602 | struct ntb_transport_qp * | |
e26a5843 | 1603 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1604 | const struct ntb_queue_handlers *handlers) |
1605 | { | |
e26a5843 AH |
1606 | struct ntb_dev *ndev; |
1607 | struct pci_dev *pdev; | |
1608 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1609 | struct ntb_queue_entry *entry; |
1610 | struct ntb_transport_qp *qp; | |
e26a5843 | 1611 | u64 qp_bit; |
fce8a7bb | 1612 | unsigned int free_queue; |
1199aa61 AH |
1613 | dma_cap_mask_t dma_mask; |
1614 | int node; | |
e26a5843 | 1615 | int i; |
fce8a7bb | 1616 | |
e26a5843 AH |
1617 | ndev = dev_ntb(client_dev->parent); |
1618 | pdev = ndev->pdev; | |
1619 | nt = ndev->ctx; | |
fce8a7bb | 1620 | |
1199aa61 AH |
1621 | node = dev_to_node(&ndev->dev); |
1622 | ||
fce8a7bb JM |
1623 | free_queue = ffs(nt->qp_bitmap); |
1624 | if (!free_queue) | |
1625 | goto err; | |
1626 | ||
1627 | /* decrement free_queue to make it zero based */ | |
1628 | free_queue--; | |
1629 | ||
e26a5843 AH |
1630 | qp = &nt->qp_vec[free_queue]; |
1631 | qp_bit = BIT_ULL(qp->qp_num); | |
1632 | ||
1633 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1634 | |
fce8a7bb JM |
1635 | qp->cb_data = data; |
1636 | qp->rx_handler = handlers->rx_handler; | |
1637 | qp->tx_handler = handlers->tx_handler; | |
1638 | qp->event_handler = handlers->event_handler; | |
1639 | ||
1199aa61 AH |
1640 | dma_cap_zero(dma_mask); |
1641 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1642 | ||
a41ef053 DJ |
1643 | if (use_dma) { |
1644 | qp->dma_chan = dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1645 | (void *)(unsigned long)node); | |
1646 | if (!qp->dma_chan) | |
1647 | dev_info(&pdev->dev, "Unable to allocate DMA channel\n"); | |
1648 | } else { | |
1649 | qp->dma_chan = NULL; | |
1650 | } | |
1651 | dev_dbg(&pdev->dev, "Using %s memcpy\n", qp->dma_chan ? "DMA" : "CPU"); | |
282a2fee | 1652 | |
fce8a7bb | 1653 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1654 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1655 | if (!entry) |
1656 | goto err1; | |
1657 | ||
282a2fee | 1658 | entry->qp = qp; |
da2e5ae5 | 1659 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
f766755c | 1660 | &qp->rx_free_q); |
fce8a7bb JM |
1661 | } |
1662 | ||
1663 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1199aa61 | 1664 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1665 | if (!entry) |
1666 | goto err2; | |
1667 | ||
282a2fee | 1668 | entry->qp = qp; |
fce8a7bb | 1669 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1670 | &qp->tx_free_q); |
fce8a7bb JM |
1671 | } |
1672 | ||
e26a5843 AH |
1673 | ntb_db_clear(qp->ndev, qp_bit); |
1674 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1675 | |
1676 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1677 | ||
1678 | return qp; | |
1679 | ||
fce8a7bb | 1680 | err2: |
f766755c | 1681 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1682 | kfree(entry); |
1683 | err1: | |
da2e5ae5 | 1684 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1685 | kfree(entry); |
94681194 | 1686 | if (qp->dma_chan) |
1199aa61 | 1687 | dma_release_channel(qp->dma_chan); |
e26a5843 | 1688 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1689 | err: |
1690 | return NULL; | |
1691 | } | |
1692 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1693 | ||
1694 | /** | |
1695 | * ntb_transport_free_queue - Frees NTB transport queue | |
1696 | * @qp: NTB queue to be freed | |
1697 | * | |
1698 | * Frees NTB transport queue | |
1699 | */ | |
1700 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1701 | { | |
186f27ff | 1702 | struct pci_dev *pdev; |
fce8a7bb | 1703 | struct ntb_queue_entry *entry; |
e26a5843 | 1704 | u64 qp_bit; |
fce8a7bb JM |
1705 | |
1706 | if (!qp) | |
1707 | return; | |
1708 | ||
e26a5843 | 1709 | pdev = qp->ndev->pdev; |
186f27ff | 1710 | |
282a2fee JM |
1711 | if (qp->dma_chan) { |
1712 | struct dma_chan *chan = qp->dma_chan; | |
1713 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1714 | * processed by the CPU instead of the DAM engine | |
1715 | */ | |
1716 | qp->dma_chan = NULL; | |
1717 | ||
1718 | /* Try to be nice and wait for any queued DMA engine | |
1719 | * transactions to process before smashing it with a rock | |
1720 | */ | |
1721 | dma_sync_wait(chan, qp->last_cookie); | |
1722 | dmaengine_terminate_all(chan); | |
1199aa61 | 1723 | dma_release_channel(chan); |
282a2fee | 1724 | } |
fce8a7bb | 1725 | |
e26a5843 AH |
1726 | qp_bit = BIT_ULL(qp->qp_num); |
1727 | ||
1728 | ntb_db_set_mask(qp->ndev, qp_bit); | |
1729 | tasklet_disable(&qp->rxc_db_work); | |
fce8a7bb | 1730 | |
282a2fee JM |
1731 | cancel_delayed_work_sync(&qp->link_work); |
1732 | ||
e26a5843 AH |
1733 | qp->cb_data = NULL; |
1734 | qp->rx_handler = NULL; | |
1735 | qp->tx_handler = NULL; | |
1736 | qp->event_handler = NULL; | |
1737 | ||
da2e5ae5 | 1738 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1739 | kfree(entry); |
1740 | ||
da2e5ae5 AH |
1741 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) { |
1742 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n"); | |
1743 | kfree(entry); | |
1744 | } | |
1745 | ||
1746 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) { | |
1747 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n"); | |
fce8a7bb JM |
1748 | kfree(entry); |
1749 | } | |
1750 | ||
f766755c | 1751 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1752 | kfree(entry); |
1753 | ||
30a4bb1e | 1754 | qp->transport->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1755 | |
1756 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1757 | } | |
1758 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1759 | ||
1760 | /** | |
1761 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1762 | * @qp: NTB queue to be freed | |
1763 | * @len: pointer to variable to write enqueued buffers length | |
1764 | * | |
1765 | * Dequeues unused buffers from receive queue. Should only be used during | |
1766 | * shutdown of qp. | |
1767 | * | |
1768 | * RETURNS: NULL error value on error, or void* for success. | |
1769 | */ | |
1770 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1771 | { | |
1772 | struct ntb_queue_entry *entry; | |
1773 | void *buf; | |
1774 | ||
e26a5843 | 1775 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1776 | return NULL; |
1777 | ||
da2e5ae5 | 1778 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q); |
fce8a7bb JM |
1779 | if (!entry) |
1780 | return NULL; | |
1781 | ||
1782 | buf = entry->cb_data; | |
1783 | *len = entry->len; | |
1784 | ||
da2e5ae5 | 1785 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1786 | |
1787 | return buf; | |
1788 | } | |
1789 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1790 | ||
1791 | /** | |
1792 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1793 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1794 | * @cb: per buffer pointer for callback function to use | |
1795 | * @data: pointer to data buffer that incoming packets will be copied into | |
1796 | * @len: length of the data buffer | |
1797 | * | |
1798 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1799 | * payload can be received into. | |
1800 | * | |
1801 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1802 | */ | |
1803 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1804 | unsigned int len) | |
1805 | { | |
1806 | struct ntb_queue_entry *entry; | |
1807 | ||
1808 | if (!qp) | |
1809 | return -EINVAL; | |
1810 | ||
da2e5ae5 | 1811 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q); |
fce8a7bb JM |
1812 | if (!entry) |
1813 | return -ENOMEM; | |
1814 | ||
1815 | entry->cb_data = cb; | |
1816 | entry->buf = data; | |
1817 | entry->len = len; | |
da2e5ae5 AH |
1818 | entry->flags = 0; |
1819 | ||
1820 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q); | |
fce8a7bb | 1821 | |
da2e5ae5 | 1822 | tasklet_schedule(&qp->rxc_db_work); |
fce8a7bb JM |
1823 | |
1824 | return 0; | |
1825 | } | |
1826 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1827 | ||
1828 | /** | |
1829 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1830 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1831 | * @cb: per buffer pointer for callback function to use | |
1832 | * @data: pointer to data buffer that will be sent | |
1833 | * @len: length of the data buffer | |
1834 | * | |
1835 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1836 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1837 | * serialize access to the qp. |
1838 | * | |
1839 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1840 | */ | |
1841 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1842 | unsigned int len) | |
1843 | { | |
1844 | struct ntb_queue_entry *entry; | |
1845 | int rc; | |
1846 | ||
e26a5843 | 1847 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
1848 | return -EINVAL; |
1849 | ||
1850 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1851 | if (!entry) { |
1852 | qp->tx_err_no_buf++; | |
e74bfeed | 1853 | return -EBUSY; |
282a2fee | 1854 | } |
fce8a7bb JM |
1855 | |
1856 | entry->cb_data = cb; | |
1857 | entry->buf = data; | |
1858 | entry->len = len; | |
1859 | entry->flags = 0; | |
1860 | ||
1861 | rc = ntb_process_tx(qp, entry); | |
1862 | if (rc) | |
1863 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1864 | &qp->tx_free_q); | |
1865 | ||
1866 | return rc; | |
1867 | } | |
1868 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1869 | ||
1870 | /** | |
1871 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1872 | * @qp: NTB transport layer queue to be enabled | |
1873 | * | |
1874 | * Notify NTB transport layer of client readiness to use queue | |
1875 | */ | |
1876 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1877 | { | |
1878 | if (!qp) | |
1879 | return; | |
1880 | ||
e26a5843 | 1881 | qp->client_ready = true; |
fce8a7bb | 1882 | |
e26a5843 | 1883 | if (qp->transport->link_is_up) |
fce8a7bb JM |
1884 | schedule_delayed_work(&qp->link_work, 0); |
1885 | } | |
1886 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1887 | ||
1888 | /** | |
1889 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1890 | * @qp: NTB transport layer queue to be disabled | |
1891 | * | |
1892 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1893 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1894 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1895 | */ |
1896 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1897 | { | |
186f27ff | 1898 | struct pci_dev *pdev; |
e26a5843 | 1899 | int val; |
fce8a7bb JM |
1900 | |
1901 | if (!qp) | |
1902 | return; | |
1903 | ||
e26a5843 AH |
1904 | pdev = qp->ndev->pdev; |
1905 | qp->client_ready = false; | |
fce8a7bb | 1906 | |
e26a5843 | 1907 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 1908 | |
e26a5843 AH |
1909 | ntb_peer_spad_write(qp->ndev, QP_LINKS, |
1910 | val & ~BIT(qp->qp_num)); | |
fce8a7bb | 1911 | |
e26a5843 | 1912 | if (qp->link_is_up) |
fce8a7bb JM |
1913 | ntb_send_link_down(qp); |
1914 | else | |
1915 | cancel_delayed_work_sync(&qp->link_work); | |
1916 | } | |
1917 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1918 | ||
1919 | /** | |
1920 | * ntb_transport_link_query - Query transport link state | |
1921 | * @qp: NTB transport layer queue to be queried | |
1922 | * | |
1923 | * Query connectivity to the remote system of the NTB transport queue | |
1924 | * | |
1925 | * RETURNS: true for link up or false for link down | |
1926 | */ | |
1927 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1928 | { | |
186f27ff JM |
1929 | if (!qp) |
1930 | return false; | |
1931 | ||
e26a5843 | 1932 | return qp->link_is_up; |
fce8a7bb JM |
1933 | } |
1934 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1935 | ||
1936 | /** | |
1937 | * ntb_transport_qp_num - Query the qp number | |
1938 | * @qp: NTB transport layer queue to be queried | |
1939 | * | |
1940 | * Query qp number of the NTB transport queue | |
1941 | * | |
1942 | * RETURNS: a zero based number specifying the qp number | |
1943 | */ | |
1944 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1945 | { | |
186f27ff JM |
1946 | if (!qp) |
1947 | return 0; | |
1948 | ||
fce8a7bb JM |
1949 | return qp->qp_num; |
1950 | } | |
1951 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1952 | ||
1953 | /** | |
1954 | * ntb_transport_max_size - Query the max payload size of a qp | |
1955 | * @qp: NTB transport layer queue to be queried | |
1956 | * | |
1957 | * Query the maximum payload size permissible on the given qp | |
1958 | * | |
1959 | * RETURNS: the max payload size of a qp | |
1960 | */ | |
ef114ed5 | 1961 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1962 | { |
282a2fee JM |
1963 | unsigned int max; |
1964 | ||
186f27ff JM |
1965 | if (!qp) |
1966 | return 0; | |
1967 | ||
282a2fee JM |
1968 | if (!qp->dma_chan) |
1969 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1970 | ||
1971 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1972 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1973 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1974 | ||
1975 | return max; | |
fce8a7bb JM |
1976 | } |
1977 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 | 1978 | |
e74bfeed DJ |
1979 | unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp) |
1980 | { | |
1981 | unsigned int head = qp->tx_index; | |
1982 | unsigned int tail = qp->remote_rx_info->entry; | |
1983 | ||
1984 | return tail > head ? tail - head : qp->tx_max_entry + tail - head; | |
1985 | } | |
1986 | EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry); | |
1987 | ||
e26a5843 AH |
1988 | static void ntb_transport_doorbell_callback(void *data, int vector) |
1989 | { | |
1990 | struct ntb_transport_ctx *nt = data; | |
1991 | struct ntb_transport_qp *qp; | |
1992 | u64 db_bits; | |
1993 | unsigned int qp_num; | |
1994 | ||
1995 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
1996 | ntb_db_vector_mask(nt->ndev, vector)); | |
1997 | ||
1998 | while (db_bits) { | |
1999 | qp_num = __ffs(db_bits); | |
2000 | qp = &nt->qp_vec[qp_num]; | |
2001 | ||
2002 | tasklet_schedule(&qp->rxc_db_work); | |
2003 | ||
2004 | db_bits &= ~BIT_ULL(qp_num); | |
2005 | } | |
2006 | } | |
2007 | ||
2008 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
2009 | .link_event = ntb_transport_event_callback, | |
2010 | .db_event = ntb_transport_doorbell_callback, | |
2011 | }; | |
2012 | ||
2013 | static struct ntb_client ntb_transport_client = { | |
2014 | .ops = { | |
2015 | .probe = ntb_transport_probe, | |
2016 | .remove = ntb_transport_free, | |
2017 | }, | |
2018 | }; | |
2019 | ||
2020 | static int __init ntb_transport_init(void) | |
2021 | { | |
2022 | int rc; | |
2023 | ||
7eb38781 DJ |
2024 | pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
2025 | ||
e26a5843 AH |
2026 | if (debugfs_initialized()) |
2027 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
2028 | ||
2029 | rc = bus_register(&ntb_transport_bus); | |
2030 | if (rc) | |
2031 | goto err_bus; | |
2032 | ||
2033 | rc = ntb_register_client(&ntb_transport_client); | |
2034 | if (rc) | |
2035 | goto err_client; | |
2036 | ||
2037 | return 0; | |
2038 | ||
2039 | err_client: | |
2040 | bus_unregister(&ntb_transport_bus); | |
2041 | err_bus: | |
2042 | debugfs_remove_recursive(nt_debugfs_dir); | |
2043 | return rc; | |
2044 | } | |
2045 | module_init(ntb_transport_init); | |
2046 | ||
2047 | static void __exit ntb_transport_exit(void) | |
2048 | { | |
2049 | debugfs_remove_recursive(nt_debugfs_dir); | |
2050 | ||
2051 | ntb_unregister_client(&ntb_transport_client); | |
2052 | bus_unregister(&ntb_transport_bus); | |
2053 | } | |
2054 | module_exit(ntb_transport_exit); |