]>
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" | |
b17faba0 | 69 | #define NTB_TRANSPORT_MIN_SPADS (MW0_SZ_HIGH + 2) |
e26a5843 AH |
70 | |
71 | MODULE_DESCRIPTION(NTB_TRANSPORT_DESC); | |
72 | MODULE_VERSION(NTB_TRANSPORT_VER); | |
73 | MODULE_LICENSE("Dual BSD/GPL"); | |
74 | MODULE_AUTHOR("Intel Corporation"); | |
75 | ||
76 | static unsigned long max_mw_size; | |
77 | module_param(max_mw_size, ulong, 0644); | |
78 | MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows"); | |
fce8a7bb | 79 | |
9891417d | 80 | static unsigned int transport_mtu = 0x10000; |
fce8a7bb JM |
81 | module_param(transport_mtu, uint, 0644); |
82 | MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets"); | |
83 | ||
948d3a65 | 84 | static unsigned char max_num_clients; |
fce8a7bb JM |
85 | module_param(max_num_clients, byte, 0644); |
86 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
87 | ||
282a2fee JM |
88 | static unsigned int copy_bytes = 1024; |
89 | module_param(copy_bytes, uint, 0644); | |
90 | MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA"); | |
91 | ||
a41ef053 DJ |
92 | static bool use_dma; |
93 | module_param(use_dma, bool, 0644); | |
94 | MODULE_PARM_DESC(use_dma, "Use DMA engine to perform large data copy"); | |
95 | ||
e26a5843 AH |
96 | static struct dentry *nt_debugfs_dir; |
97 | ||
1e530119 SS |
98 | /* Only two-ports NTB devices are supported */ |
99 | #define PIDX NTB_DEF_PEER_IDX | |
100 | ||
fce8a7bb JM |
101 | struct ntb_queue_entry { |
102 | /* ntb_queue list reference */ | |
103 | struct list_head entry; | |
e26a5843 | 104 | /* pointers to data to be transferred */ |
fce8a7bb JM |
105 | void *cb_data; |
106 | void *buf; | |
107 | unsigned int len; | |
108 | unsigned int flags; | |
9cabc269 DJ |
109 | int retries; |
110 | int errors; | |
111 | unsigned int tx_index; | |
72203572 | 112 | unsigned int rx_index; |
282a2fee JM |
113 | |
114 | struct ntb_transport_qp *qp; | |
115 | union { | |
116 | struct ntb_payload_header __iomem *tx_hdr; | |
117 | struct ntb_payload_header *rx_hdr; | |
118 | }; | |
fce8a7bb JM |
119 | }; |
120 | ||
793c20e9 JM |
121 | struct ntb_rx_info { |
122 | unsigned int entry; | |
123 | }; | |
124 | ||
fce8a7bb | 125 | struct ntb_transport_qp { |
e26a5843 AH |
126 | struct ntb_transport_ctx *transport; |
127 | struct ntb_dev *ndev; | |
fce8a7bb | 128 | void *cb_data; |
569410ca DJ |
129 | struct dma_chan *tx_dma_chan; |
130 | struct dma_chan *rx_dma_chan; | |
fce8a7bb JM |
131 | |
132 | bool client_ready; | |
e26a5843 | 133 | bool link_is_up; |
e9021331 | 134 | bool active; |
e26a5843 | 135 | |
fce8a7bb | 136 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 137 | u64 qp_bit; |
fce8a7bb | 138 | |
74465645 | 139 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
140 | struct ntb_rx_info *remote_rx_info; |
141 | ||
53ca4fea JM |
142 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
143 | void *data, int len); | |
fce8a7bb JM |
144 | struct list_head tx_free_q; |
145 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 146 | void __iomem *tx_mw; |
282a2fee | 147 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
148 | unsigned int tx_index; |
149 | unsigned int tx_max_entry; | |
ef114ed5 | 150 | unsigned int tx_max_frame; |
fce8a7bb | 151 | |
53ca4fea JM |
152 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
153 | void *data, int len); | |
da2e5ae5 | 154 | struct list_head rx_post_q; |
fce8a7bb JM |
155 | struct list_head rx_pend_q; |
156 | struct list_head rx_free_q; | |
da2e5ae5 AH |
157 | /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */ |
158 | spinlock_t ntb_rx_q_lock; | |
793c20e9 JM |
159 | void *rx_buff; |
160 | unsigned int rx_index; | |
161 | unsigned int rx_max_entry; | |
ef114ed5 | 162 | unsigned int rx_max_frame; |
a754a8fc | 163 | unsigned int rx_alloc_entry; |
282a2fee | 164 | dma_cookie_t last_cookie; |
e26a5843 | 165 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 166 | |
53ca4fea | 167 | void (*event_handler)(void *data, int status); |
fce8a7bb | 168 | struct delayed_work link_work; |
7b4f2d3c | 169 | struct work_struct link_cleanup; |
fce8a7bb JM |
170 | |
171 | struct dentry *debugfs_dir; | |
172 | struct dentry *debugfs_stats; | |
173 | ||
174 | /* Stats */ | |
175 | u64 rx_bytes; | |
176 | u64 rx_pkts; | |
177 | u64 rx_ring_empty; | |
178 | u64 rx_err_no_buf; | |
179 | u64 rx_err_oflow; | |
180 | u64 rx_err_ver; | |
282a2fee JM |
181 | u64 rx_memcpy; |
182 | u64 rx_async; | |
fce8a7bb JM |
183 | u64 tx_bytes; |
184 | u64 tx_pkts; | |
185 | u64 tx_ring_full; | |
282a2fee JM |
186 | u64 tx_err_no_buf; |
187 | u64 tx_memcpy; | |
188 | u64 tx_async; | |
fce8a7bb JM |
189 | }; |
190 | ||
191 | struct ntb_transport_mw { | |
e26a5843 AH |
192 | phys_addr_t phys_addr; |
193 | resource_size_t phys_size; | |
194 | resource_size_t xlat_align; | |
195 | resource_size_t xlat_align_size; | |
196 | void __iomem *vbase; | |
197 | size_t xlat_size; | |
198 | size_t buff_size; | |
fce8a7bb JM |
199 | void *virt_addr; |
200 | dma_addr_t dma_addr; | |
201 | }; | |
202 | ||
203 | struct ntb_transport_client_dev { | |
204 | struct list_head entry; | |
e26a5843 | 205 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
206 | struct device dev; |
207 | }; | |
208 | ||
e26a5843 | 209 | struct ntb_transport_ctx { |
fce8a7bb JM |
210 | struct list_head entry; |
211 | struct list_head client_devs; | |
212 | ||
e26a5843 AH |
213 | struct ntb_dev *ndev; |
214 | ||
215 | struct ntb_transport_mw *mw_vec; | |
216 | struct ntb_transport_qp *qp_vec; | |
217 | unsigned int mw_count; | |
218 | unsigned int qp_count; | |
219 | u64 qp_bitmap; | |
220 | u64 qp_bitmap_free; | |
221 | ||
222 | bool link_is_up; | |
fce8a7bb | 223 | struct delayed_work link_work; |
7b4f2d3c | 224 | struct work_struct link_cleanup; |
c8650fd0 DJ |
225 | |
226 | struct dentry *debugfs_node_dir; | |
fce8a7bb JM |
227 | }; |
228 | ||
229 | enum { | |
e26a5843 AH |
230 | DESC_DONE_FLAG = BIT(0), |
231 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
232 | }; |
233 | ||
234 | struct ntb_payload_header { | |
74465645 | 235 | unsigned int ver; |
fce8a7bb JM |
236 | unsigned int len; |
237 | unsigned int flags; | |
238 | }; | |
239 | ||
240 | enum { | |
241 | VERSION = 0, | |
fce8a7bb | 242 | QP_LINKS, |
113fc505 JM |
243 | NUM_QPS, |
244 | NUM_MWS, | |
245 | MW0_SZ_HIGH, | |
246 | MW0_SZ_LOW, | |
fce8a7bb JM |
247 | }; |
248 | ||
e26a5843 AH |
249 | #define dev_client_dev(__dev) \ |
250 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
251 | ||
252 | #define drv_client(__drv) \ | |
253 | container_of((__drv), struct ntb_transport_client, driver) | |
254 | ||
255 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
256 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
257 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
258 | ||
e26a5843 AH |
259 | static void ntb_transport_rxc_db(unsigned long data); |
260 | static const struct ntb_ctx_ops ntb_transport_ops; | |
261 | static struct ntb_client ntb_transport_client; | |
9cabc269 DJ |
262 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
263 | struct ntb_queue_entry *entry); | |
264 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset); | |
72203572 DJ |
265 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset); |
266 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset); | |
267 | ||
e26a5843 AH |
268 | |
269 | static int ntb_transport_bus_match(struct device *dev, | |
270 | struct device_driver *drv) | |
fce8a7bb JM |
271 | { |
272 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
273 | } | |
274 | ||
e26a5843 | 275 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 276 | { |
e26a5843 | 277 | const struct ntb_transport_client *client; |
fce8a7bb JM |
278 | int rc = -EINVAL; |
279 | ||
280 | get_device(dev); | |
e26a5843 AH |
281 | |
282 | client = drv_client(dev->driver); | |
283 | rc = client->probe(dev); | |
fce8a7bb JM |
284 | if (rc) |
285 | put_device(dev); | |
286 | ||
287 | return rc; | |
288 | } | |
289 | ||
e26a5843 | 290 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 291 | { |
e26a5843 | 292 | const struct ntb_transport_client *client; |
fce8a7bb | 293 | |
e26a5843 AH |
294 | client = drv_client(dev->driver); |
295 | client->remove(dev); | |
fce8a7bb JM |
296 | |
297 | put_device(dev); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
e26a5843 AH |
302 | static struct bus_type ntb_transport_bus = { |
303 | .name = "ntb_transport", | |
304 | .match = ntb_transport_bus_match, | |
305 | .probe = ntb_transport_bus_probe, | |
306 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
307 | }; |
308 | ||
309 | static LIST_HEAD(ntb_transport_list); | |
310 | ||
e26a5843 | 311 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 312 | { |
31510000 | 313 | list_add_tail(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
314 | return 0; |
315 | } | |
316 | ||
e26a5843 | 317 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
318 | { |
319 | struct ntb_transport_client_dev *client_dev, *cd; | |
320 | ||
321 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
322 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
323 | dev_name(&client_dev->dev)); | |
324 | list_del(&client_dev->entry); | |
325 | device_unregister(&client_dev->dev); | |
326 | } | |
327 | ||
328 | list_del(&nt->entry); | |
fce8a7bb JM |
329 | } |
330 | ||
e26a5843 | 331 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
332 | { |
333 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 334 | |
e26a5843 | 335 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
336 | kfree(client_dev); |
337 | } | |
338 | ||
339 | /** | |
e26a5843 | 340 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
341 | * @device_name: Name of NTB client device |
342 | * | |
343 | * Unregister an NTB client device with the NTB transport layer | |
344 | */ | |
e26a5843 | 345 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
346 | { |
347 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 348 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
349 | |
350 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
351 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
352 | if (!strncmp(dev_name(&client->dev), device_name, | |
353 | strlen(device_name))) { | |
354 | list_del(&client->entry); | |
355 | device_unregister(&client->dev); | |
356 | } | |
357 | } | |
e26a5843 | 358 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
359 | |
360 | /** | |
e26a5843 | 361 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
362 | * @device_name: Name of NTB client device |
363 | * | |
364 | * Register an NTB client device with the NTB transport layer | |
365 | */ | |
e26a5843 | 366 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
367 | { |
368 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 369 | struct ntb_transport_ctx *nt; |
1199aa61 | 370 | int node; |
8b19d450 | 371 | int rc, i = 0; |
fce8a7bb | 372 | |
8222b402 JM |
373 | if (list_empty(&ntb_transport_list)) |
374 | return -ENODEV; | |
375 | ||
fce8a7bb JM |
376 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
377 | struct device *dev; | |
378 | ||
1199aa61 AH |
379 | node = dev_to_node(&nt->ndev->dev); |
380 | ||
381 | client_dev = kzalloc_node(sizeof(*client_dev), | |
382 | GFP_KERNEL, node); | |
fce8a7bb JM |
383 | if (!client_dev) { |
384 | rc = -ENOMEM; | |
385 | goto err; | |
386 | } | |
387 | ||
388 | dev = &client_dev->dev; | |
389 | ||
390 | /* setup and register client devices */ | |
8b19d450 | 391 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
392 | dev->bus = &ntb_transport_bus; |
393 | dev->release = ntb_transport_client_release; | |
394 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
395 | |
396 | rc = device_register(dev); | |
397 | if (rc) { | |
398 | kfree(client_dev); | |
399 | goto err; | |
400 | } | |
401 | ||
402 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 403 | i++; |
fce8a7bb JM |
404 | } |
405 | ||
406 | return 0; | |
407 | ||
408 | err: | |
e26a5843 | 409 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
410 | |
411 | return rc; | |
412 | } | |
e26a5843 | 413 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
414 | |
415 | /** | |
ec110bc7 | 416 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
417 | * @drv: NTB client driver to be registered |
418 | * | |
419 | * Register an NTB client driver with the NTB transport layer | |
420 | * | |
421 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
422 | */ | |
e26a5843 | 423 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 424 | { |
e26a5843 | 425 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 426 | |
8222b402 JM |
427 | if (list_empty(&ntb_transport_list)) |
428 | return -ENODEV; | |
429 | ||
fce8a7bb JM |
430 | return driver_register(&drv->driver); |
431 | } | |
ec110bc7 | 432 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
433 | |
434 | /** | |
ec110bc7 | 435 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
436 | * @drv: NTB client driver to be unregistered |
437 | * | |
438 | * Unregister an NTB client driver with the NTB transport layer | |
439 | * | |
440 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
441 | */ | |
e26a5843 | 442 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
443 | { |
444 | driver_unregister(&drv->driver); | |
445 | } | |
ec110bc7 | 446 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 447 | |
fce8a7bb JM |
448 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
449 | loff_t *offp) | |
450 | { | |
451 | struct ntb_transport_qp *qp; | |
d7237e22 | 452 | char *buf; |
fce8a7bb JM |
453 | ssize_t ret, out_offset, out_count; |
454 | ||
260bee94 DJ |
455 | qp = filp->private_data; |
456 | ||
457 | if (!qp || !qp->link_is_up) | |
458 | return 0; | |
459 | ||
282a2fee | 460 | out_count = 1000; |
d7237e22 JM |
461 | |
462 | buf = kmalloc(out_count, GFP_KERNEL); | |
463 | if (!buf) | |
464 | return -ENOMEM; | |
fce8a7bb | 465 | |
fce8a7bb JM |
466 | out_offset = 0; |
467 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 468 | "\nNTB QP stats:\n\n"); |
fce8a7bb JM |
469 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
470 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
471 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
472 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
473 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
474 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
475 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
476 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
477 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
478 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
479 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
480 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
481 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
482 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
483 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
484 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
485 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 486 | "rx_buff - \t0x%p\n", qp->rx_buff); |
fce8a7bb | 487 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 488 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 489 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
a754a8fc DJ |
490 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
491 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
492 | "rx_alloc_entry - \t%u\n\n", qp->rx_alloc_entry); | |
fce8a7bb JM |
493 | |
494 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
495 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
496 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
497 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
498 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
499 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
500 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
501 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
502 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
503 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
504 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
505 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 506 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 507 | "tx_mw - \t0x%p\n", qp->tx_mw); |
fce8a7bb | 508 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 509 | "tx_index (H) - \t%u\n", qp->tx_index); |
fce8a7bb | 510 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 511 | "RRI (T) - \t%u\n", |
e74bfeed | 512 | qp->remote_rx_info->entry); |
d98ef99e DJ |
513 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
514 | "tx_max_entry - \t%u\n", qp->tx_max_entry); | |
e74bfeed DJ |
515 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
516 | "free tx - \t%u\n", | |
517 | ntb_transport_tx_free_entry(qp)); | |
fce8a7bb JM |
518 | |
519 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e DJ |
520 | "\n"); |
521 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
569410ca DJ |
522 | "Using TX DMA - \t%s\n", |
523 | qp->tx_dma_chan ? "Yes" : "No"); | |
524 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
525 | "Using RX DMA - \t%s\n", | |
526 | qp->rx_dma_chan ? "Yes" : "No"); | |
d98ef99e DJ |
527 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
528 | "QP Link - \t%s\n", | |
e26a5843 | 529 | qp->link_is_up ? "Up" : "Down"); |
d98ef99e DJ |
530 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
531 | "\n"); | |
532 | ||
d7237e22 JM |
533 | if (out_offset > out_count) |
534 | out_offset = out_count; | |
fce8a7bb JM |
535 | |
536 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 537 | kfree(buf); |
fce8a7bb JM |
538 | return ret; |
539 | } | |
540 | ||
541 | static const struct file_operations ntb_qp_debugfs_stats = { | |
542 | .owner = THIS_MODULE, | |
d66d7ac2 | 543 | .open = simple_open, |
fce8a7bb JM |
544 | .read = debugfs_read, |
545 | }; | |
546 | ||
547 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
548 | struct list_head *list) | |
549 | { | |
550 | unsigned long flags; | |
551 | ||
552 | spin_lock_irqsave(lock, flags); | |
553 | list_add_tail(entry, list); | |
554 | spin_unlock_irqrestore(lock, flags); | |
555 | } | |
556 | ||
557 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 558 | struct list_head *list) |
fce8a7bb JM |
559 | { |
560 | struct ntb_queue_entry *entry; | |
561 | unsigned long flags; | |
562 | ||
563 | spin_lock_irqsave(lock, flags); | |
564 | if (list_empty(list)) { | |
565 | entry = NULL; | |
566 | goto out; | |
567 | } | |
568 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
569 | list_del(&entry->entry); | |
e74bfeed | 570 | |
fce8a7bb JM |
571 | out: |
572 | spin_unlock_irqrestore(lock, flags); | |
573 | ||
574 | return entry; | |
575 | } | |
576 | ||
da2e5ae5 AH |
577 | static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock, |
578 | struct list_head *list, | |
579 | struct list_head *to_list) | |
580 | { | |
581 | struct ntb_queue_entry *entry; | |
582 | unsigned long flags; | |
583 | ||
584 | spin_lock_irqsave(lock, flags); | |
585 | ||
586 | if (list_empty(list)) { | |
587 | entry = NULL; | |
588 | } else { | |
589 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
590 | list_move_tail(&entry->entry, to_list); | |
591 | } | |
592 | ||
593 | spin_unlock_irqrestore(lock, flags); | |
594 | ||
595 | return entry; | |
596 | } | |
597 | ||
e26a5843 AH |
598 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
599 | unsigned int qp_num) | |
fce8a7bb | 600 | { |
e26a5843 AH |
601 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
602 | struct ntb_transport_mw *mw; | |
a754a8fc DJ |
603 | struct ntb_dev *ndev = nt->ndev; |
604 | struct ntb_queue_entry *entry; | |
ef114ed5 | 605 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 606 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 607 | unsigned int i; |
a754a8fc | 608 | int node; |
fce8a7bb | 609 | |
e26a5843 AH |
610 | mw_count = nt->mw_count; |
611 | qp_count = nt->qp_count; | |
948d3a65 | 612 | |
e26a5843 AH |
613 | mw_num = QP_TO_MW(nt, qp_num); |
614 | mw = &nt->mw_vec[mw_num]; | |
615 | ||
616 | if (!mw->virt_addr) | |
617 | return -ENOMEM; | |
fce8a7bb | 618 | |
8e8496e0 | 619 | if (mw_num < qp_count % mw_count) |
e26a5843 | 620 | num_qps_mw = qp_count / mw_count + 1; |
fce8a7bb | 621 | else |
e26a5843 | 622 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 623 | |
e26a5843 | 624 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
c92ba3c5 | 625 | qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); |
793c20e9 JM |
626 | rx_size -= sizeof(struct ntb_rx_info); |
627 | ||
282a2fee JM |
628 | qp->remote_rx_info = qp->rx_buff + rx_size; |
629 | ||
c9d534c8 JM |
630 | /* Due to housekeeping, there must be atleast 2 buffs */ |
631 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
632 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
633 | qp->rx_index = 0; | |
634 | ||
a754a8fc DJ |
635 | /* |
636 | * Checking to see if we have more entries than the default. | |
637 | * We should add additional entries if that is the case so we | |
638 | * can be in sync with the transport frames. | |
639 | */ | |
640 | node = dev_to_node(&ndev->dev); | |
641 | for (i = qp->rx_alloc_entry; i < qp->rx_max_entry; i++) { | |
642 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); | |
643 | if (!entry) | |
644 | return -ENOMEM; | |
645 | ||
646 | entry->qp = qp; | |
647 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, | |
648 | &qp->rx_free_q); | |
649 | qp->rx_alloc_entry++; | |
650 | } | |
651 | ||
c9d534c8 | 652 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 653 | |
ef114ed5 | 654 | /* setup the hdr offsets with 0's */ |
793c20e9 | 655 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
656 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
657 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 658 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 659 | } |
fce8a7bb JM |
660 | |
661 | qp->rx_pkts = 0; | |
662 | qp->tx_pkts = 0; | |
90f9e934 | 663 | qp->tx_index = 0; |
e26a5843 AH |
664 | |
665 | return 0; | |
fce8a7bb JM |
666 | } |
667 | ||
e26a5843 | 668 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 669 | { |
e26a5843 AH |
670 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
671 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
672 | |
673 | if (!mw->virt_addr) | |
674 | return; | |
675 | ||
443b9a14 | 676 | ntb_mw_clear_trans(nt->ndev, PIDX, num_mw); |
e26a5843 AH |
677 | dma_free_coherent(&pdev->dev, mw->buff_size, |
678 | mw->virt_addr, mw->dma_addr); | |
679 | mw->xlat_size = 0; | |
680 | mw->buff_size = 0; | |
b77b2637 JM |
681 | mw->virt_addr = NULL; |
682 | } | |
683 | ||
e26a5843 | 684 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
8c9edf63 | 685 | resource_size_t size) |
fce8a7bb | 686 | { |
e26a5843 AH |
687 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
688 | struct pci_dev *pdev = nt->ndev->pdev; | |
8c9edf63 | 689 | size_t xlat_size, buff_size; |
e26a5843 AH |
690 | int rc; |
691 | ||
8c9edf63 AH |
692 | if (!size) |
693 | return -EINVAL; | |
694 | ||
e26a5843 AH |
695 | xlat_size = round_up(size, mw->xlat_align_size); |
696 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 697 | |
b77b2637 | 698 | /* No need to re-setup */ |
e26a5843 | 699 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
700 | return 0; |
701 | ||
e26a5843 | 702 | if (mw->buff_size) |
b77b2637 JM |
703 | ntb_free_mw(nt, num_mw); |
704 | ||
e26a5843 AH |
705 | /* Alloc memory for receiving data. Must be aligned */ |
706 | mw->xlat_size = xlat_size; | |
707 | mw->buff_size = buff_size; | |
fce8a7bb | 708 | |
e26a5843 AH |
709 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
710 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 711 | if (!mw->virt_addr) { |
e26a5843 AH |
712 | mw->xlat_size = 0; |
713 | mw->buff_size = 0; | |
8c9edf63 | 714 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %zu\n", |
e26a5843 | 715 | buff_size); |
fce8a7bb JM |
716 | return -ENOMEM; |
717 | } | |
718 | ||
3cc5ba19 DJ |
719 | /* |
720 | * we must ensure that the memory address allocated is BAR size | |
721 | * aligned in order for the XLAT register to take the value. This | |
722 | * is a requirement of the hardware. It is recommended to setup CMA | |
723 | * for BAR sizes equal or greater than 4MB. | |
724 | */ | |
e26a5843 AH |
725 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
726 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
727 | &mw->dma_addr); |
728 | ntb_free_mw(nt, num_mw); | |
729 | return -ENOMEM; | |
730 | } | |
731 | ||
fce8a7bb | 732 | /* Notify HW the memory location of the receive buffer */ |
443b9a14 SS |
733 | rc = ntb_mw_set_trans(nt->ndev, PIDX, num_mw, mw->dma_addr, |
734 | mw->xlat_size); | |
e26a5843 AH |
735 | if (rc) { |
736 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
737 | ntb_free_mw(nt, num_mw); | |
738 | return -EIO; | |
739 | } | |
fce8a7bb JM |
740 | |
741 | return 0; | |
742 | } | |
743 | ||
2849b5d7 AH |
744 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
745 | { | |
746 | qp->link_is_up = false; | |
e9021331 | 747 | qp->active = false; |
2849b5d7 AH |
748 | |
749 | qp->tx_index = 0; | |
750 | qp->rx_index = 0; | |
751 | qp->rx_bytes = 0; | |
752 | qp->rx_pkts = 0; | |
753 | qp->rx_ring_empty = 0; | |
754 | qp->rx_err_no_buf = 0; | |
755 | qp->rx_err_oflow = 0; | |
756 | qp->rx_err_ver = 0; | |
757 | qp->rx_memcpy = 0; | |
758 | qp->rx_async = 0; | |
759 | qp->tx_bytes = 0; | |
760 | qp->tx_pkts = 0; | |
761 | qp->tx_ring_full = 0; | |
762 | qp->tx_err_no_buf = 0; | |
763 | qp->tx_memcpy = 0; | |
764 | qp->tx_async = 0; | |
765 | } | |
766 | ||
fca4d518 | 767 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 768 | { |
e26a5843 AH |
769 | struct ntb_transport_ctx *nt = qp->transport; |
770 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 771 | |
e22e0b9d | 772 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
773 | |
774 | cancel_delayed_work_sync(&qp->link_work); | |
775 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
776 | |
777 | if (qp->event_handler) | |
778 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
779 | } |
780 | ||
781 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
782 | { | |
783 | struct ntb_transport_qp *qp = container_of(work, | |
784 | struct ntb_transport_qp, | |
785 | link_cleanup); | |
e26a5843 | 786 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
787 | |
788 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 789 | |
e26a5843 | 790 | if (nt->link_is_up) |
fce8a7bb JM |
791 | schedule_delayed_work(&qp->link_work, |
792 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
793 | } | |
794 | ||
7b4f2d3c JM |
795 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
796 | { | |
797 | schedule_work(&qp->link_cleanup); | |
798 | } | |
799 | ||
e26a5843 | 800 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 801 | { |
e26a5843 AH |
802 | struct ntb_transport_qp *qp; |
803 | u64 qp_bitmap_alloc; | |
b17faba0 | 804 | unsigned int i, count; |
fce8a7bb | 805 | |
e26a5843 AH |
806 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
807 | ||
fca4d518 | 808 | /* Pass along the info to any clients */ |
e26a5843 AH |
809 | for (i = 0; i < nt->qp_count; i++) |
810 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
811 | qp = &nt->qp_vec[i]; | |
812 | ntb_qp_link_cleanup(qp); | |
813 | cancel_work_sync(&qp->link_cleanup); | |
814 | cancel_delayed_work_sync(&qp->link_work); | |
815 | } | |
fca4d518 | 816 | |
e26a5843 | 817 | if (!nt->link_is_up) |
fce8a7bb | 818 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 819 | |
fce8a7bb JM |
820 | /* The scratchpad registers keep the values if the remote side |
821 | * goes down, blast them now to give them a sane value the next | |
822 | * time they are accessed | |
823 | */ | |
b17faba0 SS |
824 | count = ntb_spad_count(nt->ndev); |
825 | for (i = 0; i < count; i++) | |
e26a5843 | 826 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
827 | } |
828 | ||
fca4d518 JM |
829 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
830 | { | |
e26a5843 AH |
831 | struct ntb_transport_ctx *nt = |
832 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
833 | |
834 | ntb_transport_link_cleanup(nt); | |
835 | } | |
836 | ||
e26a5843 | 837 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 838 | { |
e26a5843 | 839 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 840 | |
e26a5843 | 841 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 842 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 843 | else |
7b4f2d3c | 844 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
845 | } |
846 | ||
847 | static void ntb_transport_link_work(struct work_struct *work) | |
848 | { | |
e26a5843 AH |
849 | struct ntb_transport_ctx *nt = |
850 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
851 | struct ntb_dev *ndev = nt->ndev; | |
852 | struct pci_dev *pdev = ndev->pdev; | |
853 | resource_size_t size; | |
fce8a7bb | 854 | u32 val; |
84f76685 | 855 | int rc = 0, i, spad; |
fce8a7bb | 856 | |
113fc505 | 857 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
858 | for (i = 0; i < nt->mw_count; i++) { |
859 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 860 | |
e26a5843 AH |
861 | if (max_mw_size && size > max_mw_size) |
862 | size = max_mw_size; | |
fce8a7bb | 863 | |
e26a5843 | 864 | spad = MW0_SZ_HIGH + (i * 2); |
d67288a3 | 865 | ntb_peer_spad_write(ndev, PIDX, spad, upper_32_bits(size)); |
fce8a7bb | 866 | |
e26a5843 | 867 | spad = MW0_SZ_LOW + (i * 2); |
d67288a3 | 868 | ntb_peer_spad_write(ndev, PIDX, spad, lower_32_bits(size)); |
fce8a7bb JM |
869 | } |
870 | ||
d67288a3 | 871 | ntb_peer_spad_write(ndev, PIDX, NUM_MWS, nt->mw_count); |
fce8a7bb | 872 | |
d67288a3 | 873 | ntb_peer_spad_write(ndev, PIDX, NUM_QPS, nt->qp_count); |
fce8a7bb | 874 | |
d67288a3 | 875 | ntb_peer_spad_write(ndev, PIDX, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 876 | |
e26a5843 | 877 | /* Query the remote side for its info */ |
0f69a7df | 878 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
879 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
880 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 881 | goto out; |
fce8a7bb | 882 | |
0f69a7df | 883 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 884 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 885 | if (val != nt->qp_count) |
fce8a7bb | 886 | goto out; |
fce8a7bb | 887 | |
0f69a7df | 888 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 889 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
890 | if (val != nt->mw_count) |
891 | goto out; | |
fce8a7bb | 892 | |
e26a5843 | 893 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 894 | u64 val64; |
fce8a7bb | 895 | |
0f69a7df | 896 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 897 | val64 = (u64)val << 32; |
113fc505 | 898 | |
0f69a7df | 899 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
900 | val64 |= val; |
901 | ||
e26a5843 | 902 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
903 | |
904 | rc = ntb_set_mw(nt, i, val64); | |
905 | if (rc) | |
906 | goto out1; | |
907 | } | |
fce8a7bb | 908 | |
e26a5843 | 909 | nt->link_is_up = true; |
fce8a7bb | 910 | |
e26a5843 AH |
911 | for (i = 0; i < nt->qp_count; i++) { |
912 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
913 | |
914 | ntb_transport_setup_qp_mw(nt, i); | |
915 | ||
e26a5843 | 916 | if (qp->client_ready) |
fce8a7bb JM |
917 | schedule_delayed_work(&qp->link_work, 0); |
918 | } | |
919 | ||
920 | return; | |
921 | ||
113fc505 | 922 | out1: |
e26a5843 | 923 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 924 | ntb_free_mw(nt, i); |
84f76685 DJ |
925 | |
926 | /* if there's an actual failure, we should just bail */ | |
f3fd2afe | 927 | if (rc < 0) |
84f76685 | 928 | return; |
84f76685 | 929 | |
fce8a7bb | 930 | out: |
e26a5843 | 931 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
932 | schedule_delayed_work(&nt->link_work, |
933 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
934 | } | |
935 | ||
936 | static void ntb_qp_link_work(struct work_struct *work) | |
937 | { | |
938 | struct ntb_transport_qp *qp = container_of(work, | |
939 | struct ntb_transport_qp, | |
940 | link_work.work); | |
e26a5843 AH |
941 | struct pci_dev *pdev = qp->ndev->pdev; |
942 | struct ntb_transport_ctx *nt = qp->transport; | |
943 | int val; | |
fce8a7bb | 944 | |
e26a5843 | 945 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 946 | |
e26a5843 | 947 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 948 | |
d67288a3 | 949 | ntb_peer_spad_write(nt->ndev, PIDX, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
950 | |
951 | /* query remote spad for qp ready bits */ | |
28762289 | 952 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
953 | |
954 | /* See if the remote side is up */ | |
e26a5843 | 955 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 956 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 | 957 | qp->link_is_up = true; |
e9021331 | 958 | qp->active = true; |
e26a5843 | 959 | |
fce8a7bb | 960 | if (qp->event_handler) |
e26a5843 | 961 | qp->event_handler(qp->cb_data, qp->link_is_up); |
8b5a22d8 | 962 | |
e9021331 DJ |
963 | if (qp->active) |
964 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 965 | } else if (nt->link_is_up) |
fce8a7bb JM |
966 | schedule_delayed_work(&qp->link_work, |
967 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
968 | } | |
969 | ||
e26a5843 | 970 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 971 | unsigned int qp_num) |
fce8a7bb JM |
972 | { |
973 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
974 | phys_addr_t mw_base; |
975 | resource_size_t mw_size; | |
ef114ed5 | 976 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 977 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 978 | u64 qp_offset; |
948d3a65 | 979 | |
e26a5843 AH |
980 | mw_count = nt->mw_count; |
981 | qp_count = nt->qp_count; | |
fce8a7bb | 982 | |
e26a5843 | 983 | mw_num = QP_TO_MW(nt, qp_num); |
e26a5843 AH |
984 | |
985 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
986 | qp->qp_num = qp_num; |
987 | qp->transport = nt; | |
988 | qp->ndev = nt->ndev; | |
e26a5843 | 989 | qp->client_ready = false; |
fce8a7bb | 990 | qp->event_handler = NULL; |
2849b5d7 | 991 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 992 | |
8e8496e0 | 993 | if (mw_num < qp_count % mw_count) |
e26a5843 | 994 | num_qps_mw = qp_count / mw_count + 1; |
ef114ed5 | 995 | else |
e26a5843 AH |
996 | num_qps_mw = qp_count / mw_count; |
997 | ||
998 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
999 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 1000 | |
e26a5843 | 1001 | tx_size = (unsigned int)mw_size / num_qps_mw; |
c92ba3c5 | 1002 | qp_offset = tx_size * (qp_num / mw_count); |
e26a5843 AH |
1003 | |
1004 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
1005 | if (!qp->tx_mw) |
1006 | return -EINVAL; | |
1007 | ||
e26a5843 | 1008 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
1009 | if (!qp->tx_mw_phys) |
1010 | return -EINVAL; | |
1011 | ||
793c20e9 | 1012 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 1013 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 1014 | |
c9d534c8 JM |
1015 | /* Due to housekeeping, there must be atleast 2 buffs */ |
1016 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 1017 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 1018 | |
c8650fd0 | 1019 | if (nt->debugfs_node_dir) { |
fce8a7bb JM |
1020 | char debugfs_name[4]; |
1021 | ||
1022 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
1023 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
c8650fd0 | 1024 | nt->debugfs_node_dir); |
fce8a7bb JM |
1025 | |
1026 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
1027 | qp->debugfs_dir, qp, | |
1028 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
1029 | } else { |
1030 | qp->debugfs_dir = NULL; | |
1031 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
1032 | } |
1033 | ||
1034 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 1035 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb | 1036 | |
da2e5ae5 | 1037 | spin_lock_init(&qp->ntb_rx_q_lock); |
fce8a7bb JM |
1038 | spin_lock_init(&qp->ntb_tx_free_q_lock); |
1039 | ||
da2e5ae5 | 1040 | INIT_LIST_HEAD(&qp->rx_post_q); |
fce8a7bb JM |
1041 | INIT_LIST_HEAD(&qp->rx_pend_q); |
1042 | INIT_LIST_HEAD(&qp->rx_free_q); | |
1043 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 1044 | |
e26a5843 AH |
1045 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
1046 | (unsigned long)qp); | |
1047 | ||
282a2fee | 1048 | return 0; |
fce8a7bb JM |
1049 | } |
1050 | ||
e26a5843 | 1051 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1052 | { |
e26a5843 AH |
1053 | struct ntb_transport_ctx *nt; |
1054 | struct ntb_transport_mw *mw; | |
b17faba0 | 1055 | unsigned int mw_count, qp_count, spad_count, max_mw_count_for_spads; |
e26a5843 | 1056 | u64 qp_bitmap; |
1199aa61 | 1057 | int node; |
fce8a7bb JM |
1058 | int rc, i; |
1059 | ||
bc240eec | 1060 | mw_count = ntb_peer_mw_count(ndev); |
443b9a14 SS |
1061 | |
1062 | if (!ndev->ops->mw_set_trans) { | |
1063 | dev_err(&ndev->dev, "Inbound MW based NTB API is required\n"); | |
1064 | return -EINVAL; | |
1065 | } | |
19645a07 | 1066 | |
e26a5843 AH |
1067 | if (ntb_db_is_unsafe(ndev)) |
1068 | dev_dbg(&ndev->dev, | |
1069 | "doorbell is unsafe, proceed anyway...\n"); | |
1070 | if (ntb_spad_is_unsafe(ndev)) | |
1071 | dev_dbg(&ndev->dev, | |
1072 | "scratchpad is unsafe, proceed anyway...\n"); | |
1073 | ||
1e530119 SS |
1074 | if (ntb_peer_port_count(ndev) != NTB_DEF_PEER_CNT) |
1075 | dev_warn(&ndev->dev, "Multi-port NTB devices unsupported\n"); | |
1076 | ||
1199aa61 AH |
1077 | node = dev_to_node(&ndev->dev); |
1078 | ||
1079 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
1080 | if (!nt) |
1081 | return -ENOMEM; | |
1082 | ||
e26a5843 | 1083 | nt->ndev = ndev; |
b17faba0 SS |
1084 | spad_count = ntb_spad_count(ndev); |
1085 | ||
1086 | /* Limit the MW's based on the availability of scratchpads */ | |
1087 | ||
1088 | if (spad_count < NTB_TRANSPORT_MIN_SPADS) { | |
1089 | nt->mw_count = 0; | |
1090 | rc = -EINVAL; | |
1091 | goto err; | |
1092 | } | |
e26a5843 | 1093 | |
b17faba0 SS |
1094 | max_mw_count_for_spads = (spad_count - MW0_SZ_HIGH) / 2; |
1095 | nt->mw_count = min(mw_count, max_mw_count_for_spads); | |
e26a5843 | 1096 | |
1199aa61 AH |
1097 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
1098 | GFP_KERNEL, node); | |
e26a5843 AH |
1099 | if (!nt->mw_vec) { |
1100 | rc = -ENOMEM; | |
fce8a7bb JM |
1101 | goto err; |
1102 | } | |
1103 | ||
e26a5843 AH |
1104 | for (i = 0; i < mw_count; i++) { |
1105 | mw = &nt->mw_vec[i]; | |
1106 | ||
443b9a14 SS |
1107 | rc = ntb_mw_get_align(ndev, PIDX, i, &mw->xlat_align, |
1108 | &mw->xlat_align_size, NULL); | |
1109 | if (rc) | |
1110 | goto err1; | |
1111 | ||
1112 | rc = ntb_peer_mw_get_addr(ndev, i, &mw->phys_addr, | |
1113 | &mw->phys_size); | |
e26a5843 AH |
1114 | if (rc) |
1115 | goto err1; | |
1116 | ||
06917f75 | 1117 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
1118 | if (!mw->vbase) { |
1119 | rc = -ENOMEM; | |
1120 | goto err1; | |
1121 | } | |
1122 | ||
1123 | mw->buff_size = 0; | |
1124 | mw->xlat_size = 0; | |
1125 | mw->virt_addr = NULL; | |
1126 | mw->dma_addr = 0; | |
948d3a65 JM |
1127 | } |
1128 | ||
e26a5843 AH |
1129 | qp_bitmap = ntb_db_valid_mask(ndev); |
1130 | ||
1131 | qp_count = ilog2(qp_bitmap); | |
1132 | if (max_num_clients && max_num_clients < qp_count) | |
1133 | qp_count = max_num_clients; | |
cb827ee6 LG |
1134 | else if (nt->mw_count < qp_count) |
1135 | qp_count = nt->mw_count; | |
e26a5843 AH |
1136 | |
1137 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1138 | ||
1139 | nt->qp_count = qp_count; | |
1140 | nt->qp_bitmap = qp_bitmap; | |
1141 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1142 | |
1199aa61 AH |
1143 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1144 | GFP_KERNEL, node); | |
e26a5843 | 1145 | if (!nt->qp_vec) { |
fce8a7bb | 1146 | rc = -ENOMEM; |
d4adee09 | 1147 | goto err1; |
fce8a7bb JM |
1148 | } |
1149 | ||
c8650fd0 DJ |
1150 | if (nt_debugfs_dir) { |
1151 | nt->debugfs_node_dir = | |
1152 | debugfs_create_dir(pci_name(ndev->pdev), | |
1153 | nt_debugfs_dir); | |
1154 | } | |
1155 | ||
e26a5843 | 1156 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1157 | rc = ntb_transport_init_queue(nt, i); |
1158 | if (rc) | |
d4adee09 | 1159 | goto err2; |
282a2fee | 1160 | } |
fce8a7bb JM |
1161 | |
1162 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1163 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1164 | |
e26a5843 | 1165 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1166 | if (rc) |
d4adee09 | 1167 | goto err2; |
fce8a7bb JM |
1168 | |
1169 | INIT_LIST_HEAD(&nt->client_devs); | |
1170 | rc = ntb_bus_init(nt); | |
1171 | if (rc) | |
d4adee09 | 1172 | goto err3; |
fce8a7bb | 1173 | |
e26a5843 AH |
1174 | nt->link_is_up = false; |
1175 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1176 | ntb_link_event(ndev); | |
fce8a7bb JM |
1177 | |
1178 | return 0; | |
1179 | ||
948d3a65 | 1180 | err3: |
d4adee09 | 1181 | ntb_clear_ctx(ndev); |
948d3a65 | 1182 | err2: |
d4adee09 | 1183 | kfree(nt->qp_vec); |
fce8a7bb | 1184 | err1: |
e26a5843 AH |
1185 | while (i--) { |
1186 | mw = &nt->mw_vec[i]; | |
1187 | iounmap(mw->vbase); | |
1188 | } | |
d4adee09 | 1189 | kfree(nt->mw_vec); |
fce8a7bb | 1190 | err: |
fce8a7bb JM |
1191 | kfree(nt); |
1192 | return rc; | |
1193 | } | |
1194 | ||
e26a5843 | 1195 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1196 | { |
e26a5843 AH |
1197 | struct ntb_transport_ctx *nt = ndev->ctx; |
1198 | struct ntb_transport_qp *qp; | |
1199 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1200 | int i; |
1201 | ||
fca4d518 | 1202 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1203 | cancel_work_sync(&nt->link_cleanup); |
1204 | cancel_delayed_work_sync(&nt->link_work); | |
1205 | ||
1206 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1207 | |
1208 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1209 | for (i = 0; i < nt->qp_count; i++) { |
1210 | qp = &nt->qp_vec[i]; | |
1211 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1212 | ntb_transport_free_queue(qp); | |
1213 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1214 | } |
fce8a7bb | 1215 | |
e26a5843 AH |
1216 | ntb_link_disable(ndev); |
1217 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1218 | |
e26a5843 | 1219 | ntb_bus_remove(nt); |
fce8a7bb | 1220 | |
e26a5843 | 1221 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1222 | ntb_free_mw(nt, i); |
e26a5843 AH |
1223 | iounmap(nt->mw_vec[i].vbase); |
1224 | } | |
fce8a7bb | 1225 | |
e26a5843 AH |
1226 | kfree(nt->qp_vec); |
1227 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1228 | kfree(nt); |
1229 | } | |
1230 | ||
da2e5ae5 | 1231 | static void ntb_complete_rxc(struct ntb_transport_qp *qp) |
fce8a7bb | 1232 | { |
da2e5ae5 AH |
1233 | struct ntb_queue_entry *entry; |
1234 | void *cb_data; | |
1235 | unsigned int len; | |
1236 | unsigned long irqflags; | |
1237 | ||
1238 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1239 | ||
1240 | while (!list_empty(&qp->rx_post_q)) { | |
1241 | entry = list_first_entry(&qp->rx_post_q, | |
1242 | struct ntb_queue_entry, entry); | |
1243 | if (!(entry->flags & DESC_DONE_FLAG)) | |
1244 | break; | |
1245 | ||
1246 | entry->rx_hdr->flags = 0; | |
72203572 | 1247 | iowrite32(entry->rx_index, &qp->rx_info->entry); |
da2e5ae5 AH |
1248 | |
1249 | cb_data = entry->cb_data; | |
1250 | len = entry->len; | |
1251 | ||
1252 | list_move_tail(&entry->entry, &qp->rx_free_q); | |
1253 | ||
1254 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); | |
1255 | ||
1256 | if (qp->rx_handler && qp->client_ready) | |
1257 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
1258 | ||
1259 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1260 | } | |
282a2fee | 1261 | |
da2e5ae5 AH |
1262 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
1263 | } | |
fce8a7bb | 1264 | |
72203572 DJ |
1265 | static void ntb_rx_copy_callback(void *data, |
1266 | const struct dmaengine_result *res) | |
da2e5ae5 AH |
1267 | { |
1268 | struct ntb_queue_entry *entry = data; | |
fce8a7bb | 1269 | |
72203572 DJ |
1270 | /* we need to check DMA results if we are using DMA */ |
1271 | if (res) { | |
1272 | enum dmaengine_tx_result dma_err = res->result; | |
1273 | ||
1274 | switch (dma_err) { | |
1275 | case DMA_TRANS_READ_FAILED: | |
1276 | case DMA_TRANS_WRITE_FAILED: | |
1277 | entry->errors++; | |
1278 | case DMA_TRANS_ABORTED: | |
1279 | { | |
1280 | struct ntb_transport_qp *qp = entry->qp; | |
1281 | void *offset = qp->rx_buff + qp->rx_max_frame * | |
1282 | qp->rx_index; | |
1283 | ||
1284 | ntb_memcpy_rx(entry, offset); | |
1285 | qp->rx_memcpy++; | |
1286 | return; | |
1287 | } | |
1288 | ||
1289 | case DMA_TRANS_NOERROR: | |
1290 | default: | |
1291 | break; | |
1292 | } | |
1293 | } | |
1294 | ||
da2e5ae5 | 1295 | entry->flags |= DESC_DONE_FLAG; |
448c6fb3 | 1296 | |
da2e5ae5 | 1297 | ntb_complete_rxc(entry->qp); |
fce8a7bb JM |
1298 | } |
1299 | ||
282a2fee JM |
1300 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1301 | { | |
1302 | void *buf = entry->buf; | |
1303 | size_t len = entry->len; | |
1304 | ||
1305 | memcpy(buf, offset, len); | |
1306 | ||
e26a5843 AH |
1307 | /* Ensure that the data is fully copied out before clearing the flag */ |
1308 | wmb(); | |
1309 | ||
72203572 | 1310 | ntb_rx_copy_callback(entry, NULL); |
282a2fee JM |
1311 | } |
1312 | ||
72203572 | 1313 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset) |
282a2fee JM |
1314 | { |
1315 | struct dma_async_tx_descriptor *txd; | |
1316 | struct ntb_transport_qp *qp = entry->qp; | |
569410ca | 1317 | struct dma_chan *chan = qp->rx_dma_chan; |
282a2fee | 1318 | struct dma_device *device; |
da2e5ae5 | 1319 | size_t pay_off, buff_off, len; |
6f57fd05 | 1320 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1321 | dma_cookie_t cookie; |
1322 | void *buf = entry->buf; | |
282a2fee | 1323 | |
da2e5ae5 | 1324 | len = entry->len; |
282a2fee | 1325 | device = chan->device; |
e26a5843 AH |
1326 | pay_off = (size_t)offset & ~PAGE_MASK; |
1327 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1328 | |
1329 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
905921e7 | 1330 | goto err; |
282a2fee | 1331 | |
6f57fd05 BZ |
1332 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1333 | if (!unmap) | |
905921e7 | 1334 | goto err; |
282a2fee | 1335 | |
6f57fd05 BZ |
1336 | unmap->len = len; |
1337 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1338 | pay_off, len, DMA_TO_DEVICE); | |
1339 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1340 | goto err_get_unmap; | |
1341 | ||
1342 | unmap->to_cnt = 1; | |
282a2fee | 1343 | |
6f57fd05 BZ |
1344 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1345 | buff_off, len, DMA_FROM_DEVICE); | |
1346 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1347 | goto err_get_unmap; | |
1348 | ||
1349 | unmap->from_cnt = 1; | |
1350 | ||
88931ec3 AH |
1351 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
1352 | unmap->addr[0], len, | |
1353 | DMA_PREP_INTERRUPT); | |
1354 | if (!txd) | |
6f57fd05 | 1355 | goto err_get_unmap; |
282a2fee | 1356 | |
72203572 | 1357 | txd->callback_result = ntb_rx_copy_callback; |
282a2fee | 1358 | txd->callback_param = entry; |
6f57fd05 | 1359 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1360 | |
1361 | cookie = dmaengine_submit(txd); | |
1362 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1363 | goto err_set_unmap; |
1364 | ||
1365 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1366 | |
1367 | qp->last_cookie = cookie; | |
1368 | ||
1369 | qp->rx_async++; | |
1370 | ||
72203572 | 1371 | return 0; |
282a2fee | 1372 | |
6f57fd05 BZ |
1373 | err_set_unmap: |
1374 | dmaengine_unmap_put(unmap); | |
1375 | err_get_unmap: | |
1376 | dmaengine_unmap_put(unmap); | |
72203572 DJ |
1377 | err: |
1378 | return -ENXIO; | |
1379 | } | |
1380 | ||
1381 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) | |
1382 | { | |
1383 | struct ntb_transport_qp *qp = entry->qp; | |
1384 | struct dma_chan *chan = qp->rx_dma_chan; | |
1385 | int res; | |
1386 | ||
1387 | if (!chan) | |
1388 | goto err; | |
1389 | ||
1390 | if (entry->len < copy_bytes) | |
1391 | goto err; | |
1392 | ||
1393 | res = ntb_async_rx_submit(entry, offset); | |
1394 | if (res < 0) | |
1395 | goto err; | |
1396 | ||
1397 | if (!entry->retries) | |
1398 | qp->rx_async++; | |
1399 | ||
1400 | return; | |
1401 | ||
282a2fee JM |
1402 | err: |
1403 | ntb_memcpy_rx(entry, offset); | |
1404 | qp->rx_memcpy++; | |
1405 | } | |
1406 | ||
fce8a7bb JM |
1407 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1408 | { | |
1409 | struct ntb_payload_header *hdr; | |
1410 | struct ntb_queue_entry *entry; | |
1411 | void *offset; | |
1412 | ||
793c20e9 JM |
1413 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1414 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1415 | ||
e26a5843 AH |
1416 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1417 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1418 | |
fce8a7bb | 1419 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1420 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1421 | qp->rx_ring_empty++; |
1422 | return -EAGAIN; | |
1423 | } | |
1424 | ||
e26a5843 AH |
1425 | if (hdr->flags & LINK_DOWN_FLAG) { |
1426 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1427 | ntb_qp_link_down(qp); | |
1428 | hdr->flags = 0; | |
c0900b33 | 1429 | return -EAGAIN; |
e26a5843 AH |
1430 | } |
1431 | ||
1432 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1433 | dev_dbg(&qp->ndev->pdev->dev, | |
1434 | "version mismatch, expected %llu - got %u\n", | |
1435 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1436 | qp->rx_err_ver++; |
1437 | return -EIO; | |
1438 | } | |
1439 | ||
da2e5ae5 | 1440 | entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); |
e26a5843 AH |
1441 | if (!entry) { |
1442 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1443 | qp->rx_err_no_buf++; | |
da2e5ae5 | 1444 | return -EAGAIN; |
fce8a7bb JM |
1445 | } |
1446 | ||
da2e5ae5 | 1447 | entry->rx_hdr = hdr; |
72203572 | 1448 | entry->rx_index = qp->rx_index; |
da2e5ae5 | 1449 | |
282a2fee | 1450 | if (hdr->len > entry->len) { |
e26a5843 AH |
1451 | dev_dbg(&qp->ndev->pdev->dev, |
1452 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1453 | hdr->len, entry->len); |
e26a5843 | 1454 | qp->rx_err_oflow++; |
282a2fee | 1455 | |
da2e5ae5 AH |
1456 | entry->len = -EIO; |
1457 | entry->flags |= DESC_DONE_FLAG; | |
fce8a7bb | 1458 | |
da2e5ae5 AH |
1459 | ntb_complete_rxc(qp); |
1460 | } else { | |
1461 | dev_dbg(&qp->ndev->pdev->dev, | |
1462 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1463 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
e26a5843 | 1464 | |
da2e5ae5 AH |
1465 | qp->rx_bytes += hdr->len; |
1466 | qp->rx_pkts++; | |
e26a5843 | 1467 | |
da2e5ae5 | 1468 | entry->len = hdr->len; |
282a2fee | 1469 | |
da2e5ae5 AH |
1470 | ntb_async_rx(entry, offset); |
1471 | } | |
fce8a7bb | 1472 | |
282a2fee JM |
1473 | qp->rx_index++; |
1474 | qp->rx_index %= qp->rx_max_entry; | |
1475 | ||
1476 | return 0; | |
fce8a7bb JM |
1477 | } |
1478 | ||
e26a5843 | 1479 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1480 | { |
e26a5843 | 1481 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1482 | int rc, i; |
fce8a7bb | 1483 | |
e26a5843 AH |
1484 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1485 | __func__, qp->qp_num); | |
e8aeb60c | 1486 | |
c336acd3 JM |
1487 | /* Limit the number of packets processed in a single interrupt to |
1488 | * provide fairness to others | |
1489 | */ | |
1490 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1491 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1492 | if (rc) |
1493 | break; | |
1494 | } | |
282a2fee | 1495 | |
569410ca DJ |
1496 | if (i && qp->rx_dma_chan) |
1497 | dma_async_issue_pending(qp->rx_dma_chan); | |
fce8a7bb | 1498 | |
e26a5843 AH |
1499 | if (i == qp->rx_max_entry) { |
1500 | /* there is more work to do */ | |
e9021331 DJ |
1501 | if (qp->active) |
1502 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
1503 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { |
1504 | /* the doorbell bit is set: clear it */ | |
1505 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1506 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1507 | ntb_db_read(qp->ndev); | |
1508 | ||
1509 | /* an interrupt may have arrived between finishing | |
1510 | * ntb_process_rxc and clearing the doorbell bit: | |
1511 | * there might be some more work to do. | |
1512 | */ | |
e9021331 DJ |
1513 | if (qp->active) |
1514 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 1515 | } |
fce8a7bb JM |
1516 | } |
1517 | ||
9cabc269 DJ |
1518 | static void ntb_tx_copy_callback(void *data, |
1519 | const struct dmaengine_result *res) | |
fce8a7bb | 1520 | { |
282a2fee JM |
1521 | struct ntb_queue_entry *entry = data; |
1522 | struct ntb_transport_qp *qp = entry->qp; | |
1523 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1524 | |
9cabc269 DJ |
1525 | /* we need to check DMA results if we are using DMA */ |
1526 | if (res) { | |
1527 | enum dmaengine_tx_result dma_err = res->result; | |
1528 | ||
1529 | switch (dma_err) { | |
1530 | case DMA_TRANS_READ_FAILED: | |
1531 | case DMA_TRANS_WRITE_FAILED: | |
1532 | entry->errors++; | |
1533 | case DMA_TRANS_ABORTED: | |
1534 | { | |
1535 | void __iomem *offset = | |
1536 | qp->tx_mw + qp->tx_max_frame * | |
1537 | entry->tx_index; | |
1538 | ||
1539 | /* resubmit via CPU */ | |
1540 | ntb_memcpy_tx(entry, offset); | |
1541 | qp->tx_memcpy++; | |
1542 | return; | |
1543 | } | |
1544 | ||
1545 | case DMA_TRANS_NOERROR: | |
1546 | default: | |
1547 | break; | |
1548 | } | |
1549 | } | |
1550 | ||
74465645 | 1551 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1552 | |
e26a5843 | 1553 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1554 | |
1555 | /* The entry length can only be zero if the packet is intended to be a | |
1556 | * "link down" or similar. Since no payload is being sent in these | |
1557 | * cases, there is nothing to add to the completion queue. | |
1558 | */ | |
1559 | if (entry->len > 0) { | |
1560 | qp->tx_bytes += entry->len; | |
1561 | ||
1562 | if (qp->tx_handler) | |
1563 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1564 | entry->len); | |
1565 | } | |
1566 | ||
1567 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1568 | } | |
1569 | ||
282a2fee | 1570 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1571 | { |
06917f75 DJ |
1572 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1573 | /* | |
1574 | * Using non-temporal mov to improve performance on non-cached | |
1575 | * writes, even though we aren't actually copying from user space. | |
1576 | */ | |
1577 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1578 | #else | |
282a2fee | 1579 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1580 | #endif |
282a2fee | 1581 | |
e26a5843 AH |
1582 | /* Ensure that the data is fully copied out before setting the flags */ |
1583 | wmb(); | |
1584 | ||
9cabc269 | 1585 | ntb_tx_copy_callback(entry, NULL); |
282a2fee JM |
1586 | } |
1587 | ||
9cabc269 DJ |
1588 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
1589 | struct ntb_queue_entry *entry) | |
282a2fee | 1590 | { |
282a2fee | 1591 | struct dma_async_tx_descriptor *txd; |
569410ca | 1592 | struct dma_chan *chan = qp->tx_dma_chan; |
282a2fee | 1593 | struct dma_device *device; |
9cabc269 DJ |
1594 | size_t len = entry->len; |
1595 | void *buf = entry->buf; | |
282a2fee | 1596 | size_t dest_off, buff_off; |
6f57fd05 BZ |
1597 | struct dmaengine_unmap_data *unmap; |
1598 | dma_addr_t dest; | |
282a2fee | 1599 | dma_cookie_t cookie; |
fce8a7bb | 1600 | |
282a2fee | 1601 | device = chan->device; |
9cabc269 | 1602 | dest = qp->tx_mw_phys + qp->tx_max_frame * entry->tx_index; |
e26a5843 AH |
1603 | buff_off = (size_t)buf & ~PAGE_MASK; |
1604 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1605 | |
1606 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1607 | goto err; | |
1608 | ||
6f57fd05 BZ |
1609 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1610 | if (!unmap) | |
282a2fee JM |
1611 | goto err; |
1612 | ||
6f57fd05 BZ |
1613 | unmap->len = len; |
1614 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1615 | buff_off, len, DMA_TO_DEVICE); | |
1616 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1617 | goto err_get_unmap; | |
1618 | ||
1619 | unmap->to_cnt = 1; | |
1620 | ||
88931ec3 AH |
1621 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
1622 | DMA_PREP_INTERRUPT); | |
1623 | if (!txd) | |
6f57fd05 | 1624 | goto err_get_unmap; |
282a2fee | 1625 | |
9cabc269 | 1626 | txd->callback_result = ntb_tx_copy_callback; |
282a2fee | 1627 | txd->callback_param = entry; |
6f57fd05 | 1628 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1629 | |
1630 | cookie = dmaengine_submit(txd); | |
1631 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1632 | goto err_set_unmap; |
1633 | ||
1634 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1635 | |
1636 | dma_async_issue_pending(chan); | |
282a2fee | 1637 | |
9cabc269 | 1638 | return 0; |
6f57fd05 BZ |
1639 | err_set_unmap: |
1640 | dmaengine_unmap_put(unmap); | |
1641 | err_get_unmap: | |
1642 | dmaengine_unmap_put(unmap); | |
9cabc269 DJ |
1643 | err: |
1644 | return -ENXIO; | |
1645 | } | |
1646 | ||
1647 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1648 | struct ntb_queue_entry *entry) | |
1649 | { | |
1650 | struct ntb_payload_header __iomem *hdr; | |
1651 | struct dma_chan *chan = qp->tx_dma_chan; | |
1652 | void __iomem *offset; | |
1653 | int res; | |
1654 | ||
1655 | entry->tx_index = qp->tx_index; | |
1656 | offset = qp->tx_mw + qp->tx_max_frame * entry->tx_index; | |
1657 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1658 | entry->tx_hdr = hdr; | |
1659 | ||
1660 | iowrite32(entry->len, &hdr->len); | |
1661 | iowrite32((u32)qp->tx_pkts, &hdr->ver); | |
1662 | ||
1663 | if (!chan) | |
1664 | goto err; | |
1665 | ||
1666 | if (entry->len < copy_bytes) | |
1667 | goto err; | |
1668 | ||
1669 | res = ntb_async_tx_submit(qp, entry); | |
1670 | if (res < 0) | |
1671 | goto err; | |
1672 | ||
1673 | if (!entry->retries) | |
1674 | qp->tx_async++; | |
1675 | ||
1676 | return; | |
1677 | ||
282a2fee JM |
1678 | err: |
1679 | ntb_memcpy_tx(entry, offset); | |
1680 | qp->tx_memcpy++; | |
1681 | } | |
1682 | ||
1683 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1684 | struct ntb_queue_entry *entry) | |
1685 | { | |
793c20e9 | 1686 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1687 | qp->tx_ring_full++; |
1688 | return -EAGAIN; | |
1689 | } | |
1690 | ||
ef114ed5 | 1691 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb | 1692 | if (qp->tx_handler) |
179f912a | 1693 | qp->tx_handler(qp, qp->cb_data, NULL, -EIO); |
fce8a7bb JM |
1694 | |
1695 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1696 | &qp->tx_free_q); | |
1697 | return 0; | |
1698 | } | |
1699 | ||
282a2fee | 1700 | ntb_async_tx(qp, entry); |
fce8a7bb | 1701 | |
793c20e9 JM |
1702 | qp->tx_index++; |
1703 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1704 | |
1705 | qp->tx_pkts++; | |
1706 | ||
1707 | return 0; | |
1708 | } | |
1709 | ||
1710 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1711 | { | |
e26a5843 | 1712 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1713 | struct ntb_queue_entry *entry; |
1714 | int i, rc; | |
1715 | ||
e26a5843 | 1716 | if (!qp->link_is_up) |
fce8a7bb JM |
1717 | return; |
1718 | ||
e22e0b9d | 1719 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1720 | |
1721 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1722 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1723 | if (entry) |
1724 | break; | |
1725 | msleep(100); | |
1726 | } | |
1727 | ||
1728 | if (!entry) | |
1729 | return; | |
1730 | ||
1731 | entry->cb_data = NULL; | |
1732 | entry->buf = NULL; | |
1733 | entry->len = 0; | |
1734 | entry->flags = LINK_DOWN_FLAG; | |
1735 | ||
1736 | rc = ntb_process_tx(qp, entry); | |
1737 | if (rc) | |
1738 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1739 | qp->qp_num); | |
2849b5d7 AH |
1740 | |
1741 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1742 | } |
1743 | ||
1199aa61 AH |
1744 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1745 | { | |
1746 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1747 | } | |
1748 | ||
fce8a7bb JM |
1749 | /** |
1750 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1751 | * @rx_handler: receive callback function | |
1752 | * @tx_handler: transmit callback function | |
1753 | * @event_handler: event callback function | |
1754 | * | |
1755 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1756 | * routine for both transmit and receive. The receive callback routine will be | |
1757 | * used to pass up data when the transport has received it on the queue. The | |
1758 | * transmit callback routine will be called when the transport has completed the | |
1759 | * transmission of the data on the queue and the data is ready to be freed. | |
1760 | * | |
1761 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1762 | */ | |
1763 | struct ntb_transport_qp * | |
e26a5843 | 1764 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1765 | const struct ntb_queue_handlers *handlers) |
1766 | { | |
e26a5843 AH |
1767 | struct ntb_dev *ndev; |
1768 | struct pci_dev *pdev; | |
1769 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1770 | struct ntb_queue_entry *entry; |
1771 | struct ntb_transport_qp *qp; | |
e26a5843 | 1772 | u64 qp_bit; |
fce8a7bb | 1773 | unsigned int free_queue; |
1199aa61 AH |
1774 | dma_cap_mask_t dma_mask; |
1775 | int node; | |
e26a5843 | 1776 | int i; |
fce8a7bb | 1777 | |
e26a5843 AH |
1778 | ndev = dev_ntb(client_dev->parent); |
1779 | pdev = ndev->pdev; | |
1780 | nt = ndev->ctx; | |
fce8a7bb | 1781 | |
1199aa61 AH |
1782 | node = dev_to_node(&ndev->dev); |
1783 | ||
8fcd0950 | 1784 | free_queue = ffs(nt->qp_bitmap_free); |
fce8a7bb JM |
1785 | if (!free_queue) |
1786 | goto err; | |
1787 | ||
1788 | /* decrement free_queue to make it zero based */ | |
1789 | free_queue--; | |
1790 | ||
e26a5843 AH |
1791 | qp = &nt->qp_vec[free_queue]; |
1792 | qp_bit = BIT_ULL(qp->qp_num); | |
1793 | ||
1794 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1795 | |
fce8a7bb JM |
1796 | qp->cb_data = data; |
1797 | qp->rx_handler = handlers->rx_handler; | |
1798 | qp->tx_handler = handlers->tx_handler; | |
1799 | qp->event_handler = handlers->event_handler; | |
1800 | ||
1199aa61 AH |
1801 | dma_cap_zero(dma_mask); |
1802 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1803 | ||
a41ef053 | 1804 | if (use_dma) { |
569410ca DJ |
1805 | qp->tx_dma_chan = |
1806 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1807 | (void *)(unsigned long)node); | |
1808 | if (!qp->tx_dma_chan) | |
1809 | dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n"); | |
1810 | ||
1811 | qp->rx_dma_chan = | |
1812 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1813 | (void *)(unsigned long)node); | |
1814 | if (!qp->rx_dma_chan) | |
1815 | dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n"); | |
a41ef053 | 1816 | } else { |
569410ca DJ |
1817 | qp->tx_dma_chan = NULL; |
1818 | qp->rx_dma_chan = NULL; | |
a41ef053 | 1819 | } |
569410ca DJ |
1820 | |
1821 | dev_dbg(&pdev->dev, "Using %s memcpy for TX\n", | |
1822 | qp->tx_dma_chan ? "DMA" : "CPU"); | |
1823 | ||
1824 | dev_dbg(&pdev->dev, "Using %s memcpy for RX\n", | |
1825 | qp->rx_dma_chan ? "DMA" : "CPU"); | |
282a2fee | 1826 | |
fce8a7bb | 1827 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1828 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1829 | if (!entry) |
1830 | goto err1; | |
1831 | ||
282a2fee | 1832 | entry->qp = qp; |
da2e5ae5 | 1833 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
f766755c | 1834 | &qp->rx_free_q); |
fce8a7bb | 1835 | } |
a754a8fc | 1836 | qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; |
fce8a7bb | 1837 | |
a754a8fc | 1838 | for (i = 0; i < qp->tx_max_entry; i++) { |
1199aa61 | 1839 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1840 | if (!entry) |
1841 | goto err2; | |
1842 | ||
282a2fee | 1843 | entry->qp = qp; |
fce8a7bb | 1844 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1845 | &qp->tx_free_q); |
fce8a7bb JM |
1846 | } |
1847 | ||
e26a5843 AH |
1848 | ntb_db_clear(qp->ndev, qp_bit); |
1849 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1850 | |
1851 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1852 | ||
1853 | return qp; | |
1854 | ||
fce8a7bb | 1855 | err2: |
f766755c | 1856 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1857 | kfree(entry); |
1858 | err1: | |
a754a8fc | 1859 | qp->rx_alloc_entry = 0; |
da2e5ae5 | 1860 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1861 | kfree(entry); |
569410ca DJ |
1862 | if (qp->tx_dma_chan) |
1863 | dma_release_channel(qp->tx_dma_chan); | |
1864 | if (qp->rx_dma_chan) | |
1865 | dma_release_channel(qp->rx_dma_chan); | |
e26a5843 | 1866 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1867 | err: |
1868 | return NULL; | |
1869 | } | |
1870 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1871 | ||
1872 | /** | |
1873 | * ntb_transport_free_queue - Frees NTB transport queue | |
1874 | * @qp: NTB queue to be freed | |
1875 | * | |
1876 | * Frees NTB transport queue | |
1877 | */ | |
1878 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1879 | { | |
186f27ff | 1880 | struct pci_dev *pdev; |
fce8a7bb | 1881 | struct ntb_queue_entry *entry; |
e26a5843 | 1882 | u64 qp_bit; |
fce8a7bb JM |
1883 | |
1884 | if (!qp) | |
1885 | return; | |
1886 | ||
e26a5843 | 1887 | pdev = qp->ndev->pdev; |
186f27ff | 1888 | |
e9021331 DJ |
1889 | qp->active = false; |
1890 | ||
569410ca DJ |
1891 | if (qp->tx_dma_chan) { |
1892 | struct dma_chan *chan = qp->tx_dma_chan; | |
1893 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1894 | * processed by the CPU instead of the DAM engine | |
1895 | */ | |
1896 | qp->tx_dma_chan = NULL; | |
1897 | ||
1898 | /* Try to be nice and wait for any queued DMA engine | |
1899 | * transactions to process before smashing it with a rock | |
1900 | */ | |
1901 | dma_sync_wait(chan, qp->last_cookie); | |
1902 | dmaengine_terminate_all(chan); | |
1903 | dma_release_channel(chan); | |
1904 | } | |
1905 | ||
1906 | if (qp->rx_dma_chan) { | |
1907 | struct dma_chan *chan = qp->rx_dma_chan; | |
282a2fee JM |
1908 | /* Putting the dma_chan to NULL will force any new traffic to be |
1909 | * processed by the CPU instead of the DAM engine | |
1910 | */ | |
569410ca | 1911 | qp->rx_dma_chan = NULL; |
282a2fee JM |
1912 | |
1913 | /* Try to be nice and wait for any queued DMA engine | |
1914 | * transactions to process before smashing it with a rock | |
1915 | */ | |
1916 | dma_sync_wait(chan, qp->last_cookie); | |
1917 | dmaengine_terminate_all(chan); | |
1199aa61 | 1918 | dma_release_channel(chan); |
282a2fee | 1919 | } |
fce8a7bb | 1920 | |
e26a5843 AH |
1921 | qp_bit = BIT_ULL(qp->qp_num); |
1922 | ||
1923 | ntb_db_set_mask(qp->ndev, qp_bit); | |
e9021331 | 1924 | tasklet_kill(&qp->rxc_db_work); |
fce8a7bb | 1925 | |
282a2fee JM |
1926 | cancel_delayed_work_sync(&qp->link_work); |
1927 | ||
e26a5843 AH |
1928 | qp->cb_data = NULL; |
1929 | qp->rx_handler = NULL; | |
1930 | qp->tx_handler = NULL; | |
1931 | qp->event_handler = NULL; | |
1932 | ||
da2e5ae5 | 1933 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1934 | kfree(entry); |
1935 | ||
da2e5ae5 AH |
1936 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) { |
1937 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n"); | |
1938 | kfree(entry); | |
1939 | } | |
1940 | ||
1941 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) { | |
1942 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n"); | |
fce8a7bb JM |
1943 | kfree(entry); |
1944 | } | |
1945 | ||
f766755c | 1946 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1947 | kfree(entry); |
1948 | ||
30a4bb1e | 1949 | qp->transport->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1950 | |
1951 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1952 | } | |
1953 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1954 | ||
1955 | /** | |
1956 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1957 | * @qp: NTB queue to be freed | |
1958 | * @len: pointer to variable to write enqueued buffers length | |
1959 | * | |
1960 | * Dequeues unused buffers from receive queue. Should only be used during | |
1961 | * shutdown of qp. | |
1962 | * | |
1963 | * RETURNS: NULL error value on error, or void* for success. | |
1964 | */ | |
1965 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1966 | { | |
1967 | struct ntb_queue_entry *entry; | |
1968 | void *buf; | |
1969 | ||
e26a5843 | 1970 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1971 | return NULL; |
1972 | ||
da2e5ae5 | 1973 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q); |
fce8a7bb JM |
1974 | if (!entry) |
1975 | return NULL; | |
1976 | ||
1977 | buf = entry->cb_data; | |
1978 | *len = entry->len; | |
1979 | ||
da2e5ae5 | 1980 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1981 | |
1982 | return buf; | |
1983 | } | |
1984 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1985 | ||
1986 | /** | |
1987 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1988 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1989 | * @cb: per buffer pointer for callback function to use | |
1990 | * @data: pointer to data buffer that incoming packets will be copied into | |
1991 | * @len: length of the data buffer | |
1992 | * | |
1993 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1994 | * payload can be received into. | |
1995 | * | |
1996 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1997 | */ | |
1998 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1999 | unsigned int len) | |
2000 | { | |
2001 | struct ntb_queue_entry *entry; | |
2002 | ||
2003 | if (!qp) | |
2004 | return -EINVAL; | |
2005 | ||
da2e5ae5 | 2006 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q); |
fce8a7bb JM |
2007 | if (!entry) |
2008 | return -ENOMEM; | |
2009 | ||
2010 | entry->cb_data = cb; | |
2011 | entry->buf = data; | |
2012 | entry->len = len; | |
da2e5ae5 | 2013 | entry->flags = 0; |
72203572 DJ |
2014 | entry->retries = 0; |
2015 | entry->errors = 0; | |
2016 | entry->rx_index = 0; | |
da2e5ae5 AH |
2017 | |
2018 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q); | |
fce8a7bb | 2019 | |
e9021331 DJ |
2020 | if (qp->active) |
2021 | tasklet_schedule(&qp->rxc_db_work); | |
fce8a7bb JM |
2022 | |
2023 | return 0; | |
2024 | } | |
2025 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
2026 | ||
2027 | /** | |
2028 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
2029 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
2030 | * @cb: per buffer pointer for callback function to use | |
2031 | * @data: pointer to data buffer that will be sent | |
2032 | * @len: length of the data buffer | |
2033 | * | |
2034 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 2035 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
2036 | * serialize access to the qp. |
2037 | * | |
2038 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2039 | */ | |
2040 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
2041 | unsigned int len) | |
2042 | { | |
2043 | struct ntb_queue_entry *entry; | |
2044 | int rc; | |
2045 | ||
e26a5843 | 2046 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
2047 | return -EINVAL; |
2048 | ||
2049 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
2050 | if (!entry) { |
2051 | qp->tx_err_no_buf++; | |
e74bfeed | 2052 | return -EBUSY; |
282a2fee | 2053 | } |
fce8a7bb JM |
2054 | |
2055 | entry->cb_data = cb; | |
2056 | entry->buf = data; | |
2057 | entry->len = len; | |
2058 | entry->flags = 0; | |
9cabc269 DJ |
2059 | entry->errors = 0; |
2060 | entry->retries = 0; | |
2061 | entry->tx_index = 0; | |
fce8a7bb JM |
2062 | |
2063 | rc = ntb_process_tx(qp, entry); | |
2064 | if (rc) | |
2065 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
2066 | &qp->tx_free_q); | |
2067 | ||
2068 | return rc; | |
2069 | } | |
2070 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
2071 | ||
2072 | /** | |
2073 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
2074 | * @qp: NTB transport layer queue to be enabled | |
2075 | * | |
2076 | * Notify NTB transport layer of client readiness to use queue | |
2077 | */ | |
2078 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
2079 | { | |
2080 | if (!qp) | |
2081 | return; | |
2082 | ||
e26a5843 | 2083 | qp->client_ready = true; |
fce8a7bb | 2084 | |
e26a5843 | 2085 | if (qp->transport->link_is_up) |
fce8a7bb JM |
2086 | schedule_delayed_work(&qp->link_work, 0); |
2087 | } | |
2088 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
2089 | ||
2090 | /** | |
2091 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
2092 | * @qp: NTB transport layer queue to be disabled | |
2093 | * | |
2094 | * Notify NTB transport layer of client's desire to no longer receive data on | |
2095 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 2096 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
2097 | */ |
2098 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
2099 | { | |
e26a5843 | 2100 | int val; |
fce8a7bb JM |
2101 | |
2102 | if (!qp) | |
2103 | return; | |
2104 | ||
e26a5843 | 2105 | qp->client_ready = false; |
fce8a7bb | 2106 | |
e26a5843 | 2107 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 2108 | |
d67288a3 | 2109 | ntb_peer_spad_write(qp->ndev, PIDX, QP_LINKS, val & ~BIT(qp->qp_num)); |
fce8a7bb | 2110 | |
e26a5843 | 2111 | if (qp->link_is_up) |
fce8a7bb JM |
2112 | ntb_send_link_down(qp); |
2113 | else | |
2114 | cancel_delayed_work_sync(&qp->link_work); | |
2115 | } | |
2116 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
2117 | ||
2118 | /** | |
2119 | * ntb_transport_link_query - Query transport link state | |
2120 | * @qp: NTB transport layer queue to be queried | |
2121 | * | |
2122 | * Query connectivity to the remote system of the NTB transport queue | |
2123 | * | |
2124 | * RETURNS: true for link up or false for link down | |
2125 | */ | |
2126 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
2127 | { | |
186f27ff JM |
2128 | if (!qp) |
2129 | return false; | |
2130 | ||
e26a5843 | 2131 | return qp->link_is_up; |
fce8a7bb JM |
2132 | } |
2133 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
2134 | ||
2135 | /** | |
2136 | * ntb_transport_qp_num - Query the qp number | |
2137 | * @qp: NTB transport layer queue to be queried | |
2138 | * | |
2139 | * Query qp number of the NTB transport queue | |
2140 | * | |
2141 | * RETURNS: a zero based number specifying the qp number | |
2142 | */ | |
2143 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
2144 | { | |
186f27ff JM |
2145 | if (!qp) |
2146 | return 0; | |
2147 | ||
fce8a7bb JM |
2148 | return qp->qp_num; |
2149 | } | |
2150 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
2151 | ||
2152 | /** | |
2153 | * ntb_transport_max_size - Query the max payload size of a qp | |
2154 | * @qp: NTB transport layer queue to be queried | |
2155 | * | |
2156 | * Query the maximum payload size permissible on the given qp | |
2157 | * | |
2158 | * RETURNS: the max payload size of a qp | |
2159 | */ | |
ef114ed5 | 2160 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 2161 | { |
04afde45 | 2162 | unsigned int max_size; |
569410ca | 2163 | unsigned int copy_align; |
04afde45 | 2164 | struct dma_chan *rx_chan, *tx_chan; |
282a2fee | 2165 | |
186f27ff JM |
2166 | if (!qp) |
2167 | return 0; | |
2168 | ||
04afde45 DJ |
2169 | rx_chan = qp->rx_dma_chan; |
2170 | tx_chan = qp->tx_dma_chan; | |
282a2fee | 2171 | |
04afde45 DJ |
2172 | copy_align = max(rx_chan ? rx_chan->device->copy_align : 0, |
2173 | tx_chan ? tx_chan->device->copy_align : 0); | |
569410ca | 2174 | |
282a2fee | 2175 | /* If DMA engine usage is possible, try to find the max size for that */ |
04afde45 DJ |
2176 | max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header); |
2177 | max_size = round_down(max_size, 1 << copy_align); | |
282a2fee | 2178 | |
04afde45 | 2179 | return max_size; |
fce8a7bb JM |
2180 | } |
2181 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 | 2182 | |
e74bfeed DJ |
2183 | unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp) |
2184 | { | |
2185 | unsigned int head = qp->tx_index; | |
2186 | unsigned int tail = qp->remote_rx_info->entry; | |
2187 | ||
2188 | return tail > head ? tail - head : qp->tx_max_entry + tail - head; | |
2189 | } | |
2190 | EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry); | |
2191 | ||
e26a5843 AH |
2192 | static void ntb_transport_doorbell_callback(void *data, int vector) |
2193 | { | |
2194 | struct ntb_transport_ctx *nt = data; | |
2195 | struct ntb_transport_qp *qp; | |
2196 | u64 db_bits; | |
2197 | unsigned int qp_num; | |
2198 | ||
2199 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
2200 | ntb_db_vector_mask(nt->ndev, vector)); | |
2201 | ||
2202 | while (db_bits) { | |
2203 | qp_num = __ffs(db_bits); | |
2204 | qp = &nt->qp_vec[qp_num]; | |
2205 | ||
e9021331 DJ |
2206 | if (qp->active) |
2207 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
2208 | |
2209 | db_bits &= ~BIT_ULL(qp_num); | |
2210 | } | |
2211 | } | |
2212 | ||
2213 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
2214 | .link_event = ntb_transport_event_callback, | |
2215 | .db_event = ntb_transport_doorbell_callback, | |
2216 | }; | |
2217 | ||
2218 | static struct ntb_client ntb_transport_client = { | |
2219 | .ops = { | |
2220 | .probe = ntb_transport_probe, | |
2221 | .remove = ntb_transport_free, | |
2222 | }, | |
2223 | }; | |
2224 | ||
2225 | static int __init ntb_transport_init(void) | |
2226 | { | |
2227 | int rc; | |
2228 | ||
7eb38781 DJ |
2229 | pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
2230 | ||
e26a5843 AH |
2231 | if (debugfs_initialized()) |
2232 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
2233 | ||
2234 | rc = bus_register(&ntb_transport_bus); | |
2235 | if (rc) | |
2236 | goto err_bus; | |
2237 | ||
2238 | rc = ntb_register_client(&ntb_transport_client); | |
2239 | if (rc) | |
2240 | goto err_client; | |
2241 | ||
2242 | return 0; | |
2243 | ||
2244 | err_client: | |
2245 | bus_unregister(&ntb_transport_bus); | |
2246 | err_bus: | |
2247 | debugfs_remove_recursive(nt_debugfs_dir); | |
2248 | return rc; | |
2249 | } | |
2250 | module_init(ntb_transport_init); | |
2251 | ||
2252 | static void __exit ntb_transport_exit(void) | |
2253 | { | |
e26a5843 AH |
2254 | ntb_unregister_client(&ntb_transport_client); |
2255 | bus_unregister(&ntb_transport_bus); | |
dd62245e | 2256 | debugfs_remove_recursive(nt_debugfs_dir); |
e26a5843 AH |
2257 | } |
2258 | module_exit(ntb_transport_exit); |