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Commit | Line | Data |
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fce8a7bb JM |
1 | /* |
2 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
3 | * redistributing this file, you may do so under either license. | |
4 | * | |
5 | * GPL LICENSE SUMMARY | |
6 | * | |
7 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
e26a5843 | 8 | * Copyright (C) 2015 EMC Corporation. All Rights Reserved. |
fce8a7bb JM |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of version 2 of the GNU General Public License as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * BSD LICENSE | |
15 | * | |
16 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
e26a5843 | 17 | * Copyright (C) 2015 EMC Corporation. All Rights Reserved. |
fce8a7bb JM |
18 | * |
19 | * Redistribution and use in source and binary forms, with or without | |
20 | * modification, are permitted provided that the following conditions | |
21 | * are met: | |
22 | * | |
23 | * * Redistributions of source code must retain the above copyright | |
24 | * notice, this list of conditions and the following disclaimer. | |
25 | * * Redistributions in binary form must reproduce the above copy | |
26 | * notice, this list of conditions and the following disclaimer in | |
27 | * the documentation and/or other materials provided with the | |
28 | * distribution. | |
29 | * * Neither the name of Intel Corporation nor the names of its | |
30 | * contributors may be used to endorse or promote products derived | |
31 | * from this software without specific prior written permission. | |
32 | * | |
33 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
34 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
35 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
36 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
37 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
38 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
39 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
40 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
41 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
42 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
43 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
44 | * | |
e26a5843 | 45 | * PCIe NTB Transport Linux driver |
fce8a7bb JM |
46 | * |
47 | * Contact Information: | |
48 | * Jon Mason <jon.mason@intel.com> | |
49 | */ | |
50 | #include <linux/debugfs.h> | |
51 | #include <linux/delay.h> | |
282a2fee | 52 | #include <linux/dmaengine.h> |
fce8a7bb JM |
53 | #include <linux/dma-mapping.h> |
54 | #include <linux/errno.h> | |
55 | #include <linux/export.h> | |
56 | #include <linux/interrupt.h> | |
57 | #include <linux/module.h> | |
58 | #include <linux/pci.h> | |
59 | #include <linux/slab.h> | |
60 | #include <linux/types.h> | |
06917f75 | 61 | #include <linux/uaccess.h> |
e26a5843 AH |
62 | #include "linux/ntb.h" |
63 | #include "linux/ntb_transport.h" | |
fce8a7bb | 64 | |
e26a5843 AH |
65 | #define NTB_TRANSPORT_VERSION 4 |
66 | #define NTB_TRANSPORT_VER "4" | |
67 | #define NTB_TRANSPORT_NAME "ntb_transport" | |
68 | #define NTB_TRANSPORT_DESC "Software Queue-Pair Transport over NTB" | |
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 | ||
fce8a7bb JM |
98 | struct ntb_queue_entry { |
99 | /* ntb_queue list reference */ | |
100 | struct list_head entry; | |
e26a5843 | 101 | /* pointers to data to be transferred */ |
fce8a7bb JM |
102 | void *cb_data; |
103 | void *buf; | |
104 | unsigned int len; | |
105 | unsigned int flags; | |
9cabc269 DJ |
106 | int retries; |
107 | int errors; | |
108 | unsigned int tx_index; | |
72203572 | 109 | unsigned int rx_index; |
282a2fee JM |
110 | |
111 | struct ntb_transport_qp *qp; | |
112 | union { | |
113 | struct ntb_payload_header __iomem *tx_hdr; | |
114 | struct ntb_payload_header *rx_hdr; | |
115 | }; | |
fce8a7bb JM |
116 | }; |
117 | ||
793c20e9 JM |
118 | struct ntb_rx_info { |
119 | unsigned int entry; | |
120 | }; | |
121 | ||
fce8a7bb | 122 | struct ntb_transport_qp { |
e26a5843 AH |
123 | struct ntb_transport_ctx *transport; |
124 | struct ntb_dev *ndev; | |
fce8a7bb | 125 | void *cb_data; |
569410ca DJ |
126 | struct dma_chan *tx_dma_chan; |
127 | struct dma_chan *rx_dma_chan; | |
fce8a7bb JM |
128 | |
129 | bool client_ready; | |
e26a5843 | 130 | bool link_is_up; |
e9021331 | 131 | bool active; |
e26a5843 | 132 | |
fce8a7bb | 133 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 134 | u64 qp_bit; |
fce8a7bb | 135 | |
74465645 | 136 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
137 | struct ntb_rx_info *remote_rx_info; |
138 | ||
53ca4fea JM |
139 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
140 | void *data, int len); | |
fce8a7bb JM |
141 | struct list_head tx_free_q; |
142 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 143 | void __iomem *tx_mw; |
282a2fee | 144 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
145 | unsigned int tx_index; |
146 | unsigned int tx_max_entry; | |
ef114ed5 | 147 | unsigned int tx_max_frame; |
fce8a7bb | 148 | |
53ca4fea JM |
149 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
150 | void *data, int len); | |
da2e5ae5 | 151 | struct list_head rx_post_q; |
fce8a7bb JM |
152 | struct list_head rx_pend_q; |
153 | struct list_head rx_free_q; | |
da2e5ae5 AH |
154 | /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */ |
155 | spinlock_t ntb_rx_q_lock; | |
793c20e9 JM |
156 | void *rx_buff; |
157 | unsigned int rx_index; | |
158 | unsigned int rx_max_entry; | |
ef114ed5 | 159 | unsigned int rx_max_frame; |
a754a8fc | 160 | unsigned int rx_alloc_entry; |
282a2fee | 161 | dma_cookie_t last_cookie; |
e26a5843 | 162 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 163 | |
53ca4fea | 164 | void (*event_handler)(void *data, int status); |
fce8a7bb | 165 | struct delayed_work link_work; |
7b4f2d3c | 166 | struct work_struct link_cleanup; |
fce8a7bb JM |
167 | |
168 | struct dentry *debugfs_dir; | |
169 | struct dentry *debugfs_stats; | |
170 | ||
171 | /* Stats */ | |
172 | u64 rx_bytes; | |
173 | u64 rx_pkts; | |
174 | u64 rx_ring_empty; | |
175 | u64 rx_err_no_buf; | |
176 | u64 rx_err_oflow; | |
177 | u64 rx_err_ver; | |
282a2fee JM |
178 | u64 rx_memcpy; |
179 | u64 rx_async; | |
fce8a7bb JM |
180 | u64 tx_bytes; |
181 | u64 tx_pkts; | |
182 | u64 tx_ring_full; | |
282a2fee JM |
183 | u64 tx_err_no_buf; |
184 | u64 tx_memcpy; | |
185 | u64 tx_async; | |
fce8a7bb JM |
186 | }; |
187 | ||
188 | struct ntb_transport_mw { | |
e26a5843 AH |
189 | phys_addr_t phys_addr; |
190 | resource_size_t phys_size; | |
191 | resource_size_t xlat_align; | |
192 | resource_size_t xlat_align_size; | |
193 | void __iomem *vbase; | |
194 | size_t xlat_size; | |
195 | size_t buff_size; | |
fce8a7bb JM |
196 | void *virt_addr; |
197 | dma_addr_t dma_addr; | |
198 | }; | |
199 | ||
200 | struct ntb_transport_client_dev { | |
201 | struct list_head entry; | |
e26a5843 | 202 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
203 | struct device dev; |
204 | }; | |
205 | ||
e26a5843 | 206 | struct ntb_transport_ctx { |
fce8a7bb JM |
207 | struct list_head entry; |
208 | struct list_head client_devs; | |
209 | ||
e26a5843 AH |
210 | struct ntb_dev *ndev; |
211 | ||
212 | struct ntb_transport_mw *mw_vec; | |
213 | struct ntb_transport_qp *qp_vec; | |
214 | unsigned int mw_count; | |
215 | unsigned int qp_count; | |
216 | u64 qp_bitmap; | |
217 | u64 qp_bitmap_free; | |
218 | ||
219 | bool link_is_up; | |
fce8a7bb | 220 | struct delayed_work link_work; |
7b4f2d3c | 221 | struct work_struct link_cleanup; |
c8650fd0 DJ |
222 | |
223 | struct dentry *debugfs_node_dir; | |
fce8a7bb JM |
224 | }; |
225 | ||
226 | enum { | |
e26a5843 AH |
227 | DESC_DONE_FLAG = BIT(0), |
228 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
229 | }; |
230 | ||
231 | struct ntb_payload_header { | |
74465645 | 232 | unsigned int ver; |
fce8a7bb JM |
233 | unsigned int len; |
234 | unsigned int flags; | |
235 | }; | |
236 | ||
237 | enum { | |
238 | VERSION = 0, | |
fce8a7bb | 239 | QP_LINKS, |
113fc505 JM |
240 | NUM_QPS, |
241 | NUM_MWS, | |
242 | MW0_SZ_HIGH, | |
243 | MW0_SZ_LOW, | |
fce8a7bb JM |
244 | }; |
245 | ||
e26a5843 AH |
246 | #define dev_client_dev(__dev) \ |
247 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
248 | ||
249 | #define drv_client(__drv) \ | |
250 | container_of((__drv), struct ntb_transport_client, driver) | |
251 | ||
252 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
253 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
254 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
255 | ||
e26a5843 AH |
256 | static void ntb_transport_rxc_db(unsigned long data); |
257 | static const struct ntb_ctx_ops ntb_transport_ops; | |
258 | static struct ntb_client ntb_transport_client; | |
9cabc269 DJ |
259 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
260 | struct ntb_queue_entry *entry); | |
261 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset); | |
72203572 DJ |
262 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset); |
263 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset); | |
264 | ||
e26a5843 AH |
265 | |
266 | static int ntb_transport_bus_match(struct device *dev, | |
267 | struct device_driver *drv) | |
fce8a7bb JM |
268 | { |
269 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
270 | } | |
271 | ||
e26a5843 | 272 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 273 | { |
e26a5843 | 274 | const struct ntb_transport_client *client; |
fce8a7bb JM |
275 | int rc = -EINVAL; |
276 | ||
277 | get_device(dev); | |
e26a5843 AH |
278 | |
279 | client = drv_client(dev->driver); | |
280 | rc = client->probe(dev); | |
fce8a7bb JM |
281 | if (rc) |
282 | put_device(dev); | |
283 | ||
284 | return rc; | |
285 | } | |
286 | ||
e26a5843 | 287 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 288 | { |
e26a5843 | 289 | const struct ntb_transport_client *client; |
fce8a7bb | 290 | |
e26a5843 AH |
291 | client = drv_client(dev->driver); |
292 | client->remove(dev); | |
fce8a7bb JM |
293 | |
294 | put_device(dev); | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
e26a5843 AH |
299 | static struct bus_type ntb_transport_bus = { |
300 | .name = "ntb_transport", | |
301 | .match = ntb_transport_bus_match, | |
302 | .probe = ntb_transport_bus_probe, | |
303 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
304 | }; |
305 | ||
306 | static LIST_HEAD(ntb_transport_list); | |
307 | ||
e26a5843 | 308 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 309 | { |
31510000 | 310 | list_add_tail(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
311 | return 0; |
312 | } | |
313 | ||
e26a5843 | 314 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
315 | { |
316 | struct ntb_transport_client_dev *client_dev, *cd; | |
317 | ||
318 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
319 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
320 | dev_name(&client_dev->dev)); | |
321 | list_del(&client_dev->entry); | |
322 | device_unregister(&client_dev->dev); | |
323 | } | |
324 | ||
325 | list_del(&nt->entry); | |
fce8a7bb JM |
326 | } |
327 | ||
e26a5843 | 328 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
329 | { |
330 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 331 | |
e26a5843 | 332 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
333 | kfree(client_dev); |
334 | } | |
335 | ||
336 | /** | |
e26a5843 | 337 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
338 | * @device_name: Name of NTB client device |
339 | * | |
340 | * Unregister an NTB client device with the NTB transport layer | |
341 | */ | |
e26a5843 | 342 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
343 | { |
344 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 345 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
346 | |
347 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
348 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
349 | if (!strncmp(dev_name(&client->dev), device_name, | |
350 | strlen(device_name))) { | |
351 | list_del(&client->entry); | |
352 | device_unregister(&client->dev); | |
353 | } | |
354 | } | |
e26a5843 | 355 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
356 | |
357 | /** | |
e26a5843 | 358 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
359 | * @device_name: Name of NTB client device |
360 | * | |
361 | * Register an NTB client device with the NTB transport layer | |
362 | */ | |
e26a5843 | 363 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
364 | { |
365 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 366 | struct ntb_transport_ctx *nt; |
1199aa61 | 367 | int node; |
8b19d450 | 368 | int rc, i = 0; |
fce8a7bb | 369 | |
8222b402 JM |
370 | if (list_empty(&ntb_transport_list)) |
371 | return -ENODEV; | |
372 | ||
fce8a7bb JM |
373 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
374 | struct device *dev; | |
375 | ||
1199aa61 AH |
376 | node = dev_to_node(&nt->ndev->dev); |
377 | ||
378 | client_dev = kzalloc_node(sizeof(*client_dev), | |
379 | GFP_KERNEL, node); | |
fce8a7bb JM |
380 | if (!client_dev) { |
381 | rc = -ENOMEM; | |
382 | goto err; | |
383 | } | |
384 | ||
385 | dev = &client_dev->dev; | |
386 | ||
387 | /* setup and register client devices */ | |
8b19d450 | 388 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
389 | dev->bus = &ntb_transport_bus; |
390 | dev->release = ntb_transport_client_release; | |
391 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
392 | |
393 | rc = device_register(dev); | |
394 | if (rc) { | |
395 | kfree(client_dev); | |
396 | goto err; | |
397 | } | |
398 | ||
399 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 400 | i++; |
fce8a7bb JM |
401 | } |
402 | ||
403 | return 0; | |
404 | ||
405 | err: | |
e26a5843 | 406 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
407 | |
408 | return rc; | |
409 | } | |
e26a5843 | 410 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
411 | |
412 | /** | |
ec110bc7 | 413 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
414 | * @drv: NTB client driver to be registered |
415 | * | |
416 | * Register an NTB client driver with the NTB transport layer | |
417 | * | |
418 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
419 | */ | |
e26a5843 | 420 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 421 | { |
e26a5843 | 422 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 423 | |
8222b402 JM |
424 | if (list_empty(&ntb_transport_list)) |
425 | return -ENODEV; | |
426 | ||
fce8a7bb JM |
427 | return driver_register(&drv->driver); |
428 | } | |
ec110bc7 | 429 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
430 | |
431 | /** | |
ec110bc7 | 432 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
433 | * @drv: NTB client driver to be unregistered |
434 | * | |
435 | * Unregister an NTB client driver with the NTB transport layer | |
436 | * | |
437 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
438 | */ | |
e26a5843 | 439 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
440 | { |
441 | driver_unregister(&drv->driver); | |
442 | } | |
ec110bc7 | 443 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 444 | |
fce8a7bb JM |
445 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
446 | loff_t *offp) | |
447 | { | |
448 | struct ntb_transport_qp *qp; | |
d7237e22 | 449 | char *buf; |
fce8a7bb JM |
450 | ssize_t ret, out_offset, out_count; |
451 | ||
260bee94 DJ |
452 | qp = filp->private_data; |
453 | ||
454 | if (!qp || !qp->link_is_up) | |
455 | return 0; | |
456 | ||
282a2fee | 457 | out_count = 1000; |
d7237e22 JM |
458 | |
459 | buf = kmalloc(out_count, GFP_KERNEL); | |
460 | if (!buf) | |
461 | return -ENOMEM; | |
fce8a7bb | 462 | |
fce8a7bb JM |
463 | out_offset = 0; |
464 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 465 | "\nNTB QP stats:\n\n"); |
fce8a7bb JM |
466 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
467 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
468 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
469 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
470 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
471 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
472 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
473 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
474 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
475 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
476 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
477 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
478 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
479 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
480 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
481 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
482 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 483 | "rx_buff - \t0x%p\n", qp->rx_buff); |
fce8a7bb | 484 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 485 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 486 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
a754a8fc DJ |
487 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
488 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
489 | "rx_alloc_entry - \t%u\n\n", qp->rx_alloc_entry); | |
fce8a7bb JM |
490 | |
491 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
492 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
493 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
494 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
495 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
496 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
497 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
498 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
499 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
500 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
501 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
502 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 503 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 504 | "tx_mw - \t0x%p\n", qp->tx_mw); |
fce8a7bb | 505 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 506 | "tx_index (H) - \t%u\n", qp->tx_index); |
fce8a7bb | 507 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 508 | "RRI (T) - \t%u\n", |
e74bfeed | 509 | qp->remote_rx_info->entry); |
d98ef99e DJ |
510 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
511 | "tx_max_entry - \t%u\n", qp->tx_max_entry); | |
e74bfeed DJ |
512 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
513 | "free tx - \t%u\n", | |
514 | ntb_transport_tx_free_entry(qp)); | |
fce8a7bb JM |
515 | |
516 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e DJ |
517 | "\n"); |
518 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
569410ca DJ |
519 | "Using TX DMA - \t%s\n", |
520 | qp->tx_dma_chan ? "Yes" : "No"); | |
521 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
522 | "Using RX DMA - \t%s\n", | |
523 | qp->rx_dma_chan ? "Yes" : "No"); | |
d98ef99e DJ |
524 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
525 | "QP Link - \t%s\n", | |
e26a5843 | 526 | qp->link_is_up ? "Up" : "Down"); |
d98ef99e DJ |
527 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
528 | "\n"); | |
529 | ||
d7237e22 JM |
530 | if (out_offset > out_count) |
531 | out_offset = out_count; | |
fce8a7bb JM |
532 | |
533 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 534 | kfree(buf); |
fce8a7bb JM |
535 | return ret; |
536 | } | |
537 | ||
538 | static const struct file_operations ntb_qp_debugfs_stats = { | |
539 | .owner = THIS_MODULE, | |
d66d7ac2 | 540 | .open = simple_open, |
fce8a7bb JM |
541 | .read = debugfs_read, |
542 | }; | |
543 | ||
544 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
545 | struct list_head *list) | |
546 | { | |
547 | unsigned long flags; | |
548 | ||
549 | spin_lock_irqsave(lock, flags); | |
550 | list_add_tail(entry, list); | |
551 | spin_unlock_irqrestore(lock, flags); | |
552 | } | |
553 | ||
554 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 555 | struct list_head *list) |
fce8a7bb JM |
556 | { |
557 | struct ntb_queue_entry *entry; | |
558 | unsigned long flags; | |
559 | ||
560 | spin_lock_irqsave(lock, flags); | |
561 | if (list_empty(list)) { | |
562 | entry = NULL; | |
563 | goto out; | |
564 | } | |
565 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
566 | list_del(&entry->entry); | |
e74bfeed | 567 | |
fce8a7bb JM |
568 | out: |
569 | spin_unlock_irqrestore(lock, flags); | |
570 | ||
571 | return entry; | |
572 | } | |
573 | ||
da2e5ae5 AH |
574 | static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock, |
575 | struct list_head *list, | |
576 | struct list_head *to_list) | |
577 | { | |
578 | struct ntb_queue_entry *entry; | |
579 | unsigned long flags; | |
580 | ||
581 | spin_lock_irqsave(lock, flags); | |
582 | ||
583 | if (list_empty(list)) { | |
584 | entry = NULL; | |
585 | } else { | |
586 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
587 | list_move_tail(&entry->entry, to_list); | |
588 | } | |
589 | ||
590 | spin_unlock_irqrestore(lock, flags); | |
591 | ||
592 | return entry; | |
593 | } | |
594 | ||
e26a5843 AH |
595 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
596 | unsigned int qp_num) | |
fce8a7bb | 597 | { |
e26a5843 AH |
598 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
599 | struct ntb_transport_mw *mw; | |
a754a8fc DJ |
600 | struct ntb_dev *ndev = nt->ndev; |
601 | struct ntb_queue_entry *entry; | |
ef114ed5 | 602 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 603 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 604 | unsigned int i; |
a754a8fc | 605 | int node; |
fce8a7bb | 606 | |
e26a5843 AH |
607 | mw_count = nt->mw_count; |
608 | qp_count = nt->qp_count; | |
948d3a65 | 609 | |
e26a5843 AH |
610 | mw_num = QP_TO_MW(nt, qp_num); |
611 | mw = &nt->mw_vec[mw_num]; | |
612 | ||
613 | if (!mw->virt_addr) | |
614 | return -ENOMEM; | |
fce8a7bb | 615 | |
8e8496e0 | 616 | if (mw_num < qp_count % mw_count) |
e26a5843 | 617 | num_qps_mw = qp_count / mw_count + 1; |
fce8a7bb | 618 | else |
e26a5843 | 619 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 620 | |
e26a5843 | 621 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
c92ba3c5 | 622 | qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); |
793c20e9 JM |
623 | rx_size -= sizeof(struct ntb_rx_info); |
624 | ||
282a2fee JM |
625 | qp->remote_rx_info = qp->rx_buff + rx_size; |
626 | ||
c9d534c8 JM |
627 | /* Due to housekeeping, there must be atleast 2 buffs */ |
628 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
629 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
630 | qp->rx_index = 0; | |
631 | ||
a754a8fc DJ |
632 | /* |
633 | * Checking to see if we have more entries than the default. | |
634 | * We should add additional entries if that is the case so we | |
635 | * can be in sync with the transport frames. | |
636 | */ | |
637 | node = dev_to_node(&ndev->dev); | |
638 | for (i = qp->rx_alloc_entry; i < qp->rx_max_entry; i++) { | |
639 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); | |
640 | if (!entry) | |
641 | return -ENOMEM; | |
642 | ||
643 | entry->qp = qp; | |
644 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, | |
645 | &qp->rx_free_q); | |
646 | qp->rx_alloc_entry++; | |
647 | } | |
648 | ||
c9d534c8 | 649 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 650 | |
ef114ed5 | 651 | /* setup the hdr offsets with 0's */ |
793c20e9 | 652 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
653 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
654 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 655 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 656 | } |
fce8a7bb JM |
657 | |
658 | qp->rx_pkts = 0; | |
659 | qp->tx_pkts = 0; | |
90f9e934 | 660 | qp->tx_index = 0; |
e26a5843 AH |
661 | |
662 | return 0; | |
fce8a7bb JM |
663 | } |
664 | ||
e26a5843 | 665 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 666 | { |
e26a5843 AH |
667 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
668 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
669 | |
670 | if (!mw->virt_addr) | |
671 | return; | |
672 | ||
e26a5843 AH |
673 | ntb_mw_clear_trans(nt->ndev, num_mw); |
674 | dma_free_coherent(&pdev->dev, mw->buff_size, | |
675 | mw->virt_addr, mw->dma_addr); | |
676 | mw->xlat_size = 0; | |
677 | mw->buff_size = 0; | |
b77b2637 JM |
678 | mw->virt_addr = NULL; |
679 | } | |
680 | ||
e26a5843 | 681 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
8c9edf63 | 682 | resource_size_t size) |
fce8a7bb | 683 | { |
e26a5843 AH |
684 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
685 | struct pci_dev *pdev = nt->ndev->pdev; | |
8c9edf63 | 686 | size_t xlat_size, buff_size; |
e26a5843 AH |
687 | int rc; |
688 | ||
8c9edf63 AH |
689 | if (!size) |
690 | return -EINVAL; | |
691 | ||
e26a5843 AH |
692 | xlat_size = round_up(size, mw->xlat_align_size); |
693 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 694 | |
b77b2637 | 695 | /* No need to re-setup */ |
e26a5843 | 696 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
697 | return 0; |
698 | ||
e26a5843 | 699 | if (mw->buff_size) |
b77b2637 JM |
700 | ntb_free_mw(nt, num_mw); |
701 | ||
e26a5843 AH |
702 | /* Alloc memory for receiving data. Must be aligned */ |
703 | mw->xlat_size = xlat_size; | |
704 | mw->buff_size = buff_size; | |
fce8a7bb | 705 | |
e26a5843 AH |
706 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
707 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 708 | if (!mw->virt_addr) { |
e26a5843 AH |
709 | mw->xlat_size = 0; |
710 | mw->buff_size = 0; | |
8c9edf63 | 711 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %zu\n", |
e26a5843 | 712 | buff_size); |
fce8a7bb JM |
713 | return -ENOMEM; |
714 | } | |
715 | ||
3cc5ba19 DJ |
716 | /* |
717 | * we must ensure that the memory address allocated is BAR size | |
718 | * aligned in order for the XLAT register to take the value. This | |
719 | * is a requirement of the hardware. It is recommended to setup CMA | |
720 | * for BAR sizes equal or greater than 4MB. | |
721 | */ | |
e26a5843 AH |
722 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
723 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
724 | &mw->dma_addr); |
725 | ntb_free_mw(nt, num_mw); | |
726 | return -ENOMEM; | |
727 | } | |
728 | ||
fce8a7bb | 729 | /* Notify HW the memory location of the receive buffer */ |
e26a5843 AH |
730 | rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
731 | if (rc) { | |
732 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
733 | ntb_free_mw(nt, num_mw); | |
734 | return -EIO; | |
735 | } | |
fce8a7bb JM |
736 | |
737 | return 0; | |
738 | } | |
739 | ||
2849b5d7 AH |
740 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
741 | { | |
742 | qp->link_is_up = false; | |
e9021331 | 743 | qp->active = false; |
2849b5d7 AH |
744 | |
745 | qp->tx_index = 0; | |
746 | qp->rx_index = 0; | |
747 | qp->rx_bytes = 0; | |
748 | qp->rx_pkts = 0; | |
749 | qp->rx_ring_empty = 0; | |
750 | qp->rx_err_no_buf = 0; | |
751 | qp->rx_err_oflow = 0; | |
752 | qp->rx_err_ver = 0; | |
753 | qp->rx_memcpy = 0; | |
754 | qp->rx_async = 0; | |
755 | qp->tx_bytes = 0; | |
756 | qp->tx_pkts = 0; | |
757 | qp->tx_ring_full = 0; | |
758 | qp->tx_err_no_buf = 0; | |
759 | qp->tx_memcpy = 0; | |
760 | qp->tx_async = 0; | |
761 | } | |
762 | ||
fca4d518 | 763 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 764 | { |
e26a5843 AH |
765 | struct ntb_transport_ctx *nt = qp->transport; |
766 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 767 | |
e22e0b9d | 768 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
769 | |
770 | cancel_delayed_work_sync(&qp->link_work); | |
771 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
772 | |
773 | if (qp->event_handler) | |
774 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
775 | } |
776 | ||
777 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
778 | { | |
779 | struct ntb_transport_qp *qp = container_of(work, | |
780 | struct ntb_transport_qp, | |
781 | link_cleanup); | |
e26a5843 | 782 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
783 | |
784 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 785 | |
e26a5843 | 786 | if (nt->link_is_up) |
fce8a7bb JM |
787 | schedule_delayed_work(&qp->link_work, |
788 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
789 | } | |
790 | ||
7b4f2d3c JM |
791 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
792 | { | |
793 | schedule_work(&qp->link_cleanup); | |
794 | } | |
795 | ||
e26a5843 | 796 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 797 | { |
e26a5843 AH |
798 | struct ntb_transport_qp *qp; |
799 | u64 qp_bitmap_alloc; | |
b17faba0 | 800 | unsigned int i, count; |
fce8a7bb | 801 | |
e26a5843 AH |
802 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
803 | ||
fca4d518 | 804 | /* Pass along the info to any clients */ |
e26a5843 AH |
805 | for (i = 0; i < nt->qp_count; i++) |
806 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
807 | qp = &nt->qp_vec[i]; | |
808 | ntb_qp_link_cleanup(qp); | |
809 | cancel_work_sync(&qp->link_cleanup); | |
810 | cancel_delayed_work_sync(&qp->link_work); | |
811 | } | |
fca4d518 | 812 | |
e26a5843 | 813 | if (!nt->link_is_up) |
fce8a7bb | 814 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 815 | |
fce8a7bb JM |
816 | /* The scratchpad registers keep the values if the remote side |
817 | * goes down, blast them now to give them a sane value the next | |
818 | * time they are accessed | |
819 | */ | |
b17faba0 SS |
820 | count = ntb_spad_count(nt->ndev); |
821 | for (i = 0; i < count; i++) | |
e26a5843 | 822 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
823 | } |
824 | ||
fca4d518 JM |
825 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
826 | { | |
e26a5843 AH |
827 | struct ntb_transport_ctx *nt = |
828 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
829 | |
830 | ntb_transport_link_cleanup(nt); | |
831 | } | |
832 | ||
e26a5843 | 833 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 834 | { |
e26a5843 | 835 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 836 | |
e26a5843 | 837 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 838 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 839 | else |
7b4f2d3c | 840 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
841 | } |
842 | ||
843 | static void ntb_transport_link_work(struct work_struct *work) | |
844 | { | |
e26a5843 AH |
845 | struct ntb_transport_ctx *nt = |
846 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
847 | struct ntb_dev *ndev = nt->ndev; | |
848 | struct pci_dev *pdev = ndev->pdev; | |
849 | resource_size_t size; | |
fce8a7bb | 850 | u32 val; |
84f76685 | 851 | int rc = 0, i, spad; |
fce8a7bb | 852 | |
113fc505 | 853 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
854 | for (i = 0; i < nt->mw_count; i++) { |
855 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 856 | |
e26a5843 AH |
857 | if (max_mw_size && size > max_mw_size) |
858 | size = max_mw_size; | |
fce8a7bb | 859 | |
e26a5843 | 860 | spad = MW0_SZ_HIGH + (i * 2); |
fdcb4b2e | 861 | ntb_peer_spad_write(ndev, spad, upper_32_bits(size)); |
fce8a7bb | 862 | |
e26a5843 | 863 | spad = MW0_SZ_LOW + (i * 2); |
fdcb4b2e | 864 | ntb_peer_spad_write(ndev, spad, lower_32_bits(size)); |
fce8a7bb JM |
865 | } |
866 | ||
e26a5843 | 867 | ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
fce8a7bb | 868 | |
e26a5843 | 869 | ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
fce8a7bb | 870 | |
e26a5843 | 871 | ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 872 | |
e26a5843 | 873 | /* Query the remote side for its info */ |
0f69a7df | 874 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
875 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
876 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 877 | goto out; |
fce8a7bb | 878 | |
0f69a7df | 879 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 880 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 881 | if (val != nt->qp_count) |
fce8a7bb | 882 | goto out; |
fce8a7bb | 883 | |
0f69a7df | 884 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 885 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
886 | if (val != nt->mw_count) |
887 | goto out; | |
fce8a7bb | 888 | |
e26a5843 | 889 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 890 | u64 val64; |
fce8a7bb | 891 | |
0f69a7df | 892 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 893 | val64 = (u64)val << 32; |
113fc505 | 894 | |
0f69a7df | 895 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
896 | val64 |= val; |
897 | ||
e26a5843 | 898 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
899 | |
900 | rc = ntb_set_mw(nt, i, val64); | |
901 | if (rc) | |
902 | goto out1; | |
903 | } | |
fce8a7bb | 904 | |
e26a5843 | 905 | nt->link_is_up = true; |
fce8a7bb | 906 | |
e26a5843 AH |
907 | for (i = 0; i < nt->qp_count; i++) { |
908 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
909 | |
910 | ntb_transport_setup_qp_mw(nt, i); | |
911 | ||
e26a5843 | 912 | if (qp->client_ready) |
fce8a7bb JM |
913 | schedule_delayed_work(&qp->link_work, 0); |
914 | } | |
915 | ||
916 | return; | |
917 | ||
113fc505 | 918 | out1: |
e26a5843 | 919 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 920 | ntb_free_mw(nt, i); |
84f76685 DJ |
921 | |
922 | /* if there's an actual failure, we should just bail */ | |
923 | if (rc < 0) { | |
924 | ntb_link_disable(ndev); | |
925 | return; | |
926 | } | |
927 | ||
fce8a7bb | 928 | out: |
e26a5843 | 929 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
930 | schedule_delayed_work(&nt->link_work, |
931 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
932 | } | |
933 | ||
934 | static void ntb_qp_link_work(struct work_struct *work) | |
935 | { | |
936 | struct ntb_transport_qp *qp = container_of(work, | |
937 | struct ntb_transport_qp, | |
938 | link_work.work); | |
e26a5843 AH |
939 | struct pci_dev *pdev = qp->ndev->pdev; |
940 | struct ntb_transport_ctx *nt = qp->transport; | |
941 | int val; | |
fce8a7bb | 942 | |
e26a5843 | 943 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 944 | |
e26a5843 | 945 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 946 | |
e26a5843 | 947 | ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
948 | |
949 | /* query remote spad for qp ready bits */ | |
28762289 | 950 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
951 | |
952 | /* See if the remote side is up */ | |
e26a5843 | 953 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 954 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 | 955 | qp->link_is_up = true; |
e9021331 | 956 | qp->active = true; |
e26a5843 | 957 | |
fce8a7bb | 958 | if (qp->event_handler) |
e26a5843 | 959 | qp->event_handler(qp->cb_data, qp->link_is_up); |
8b5a22d8 | 960 | |
e9021331 DJ |
961 | if (qp->active) |
962 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 963 | } else if (nt->link_is_up) |
fce8a7bb JM |
964 | schedule_delayed_work(&qp->link_work, |
965 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
966 | } | |
967 | ||
e26a5843 | 968 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 969 | unsigned int qp_num) |
fce8a7bb JM |
970 | { |
971 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
972 | phys_addr_t mw_base; |
973 | resource_size_t mw_size; | |
ef114ed5 | 974 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 975 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 976 | u64 qp_offset; |
948d3a65 | 977 | |
e26a5843 AH |
978 | mw_count = nt->mw_count; |
979 | qp_count = nt->qp_count; | |
fce8a7bb | 980 | |
e26a5843 | 981 | mw_num = QP_TO_MW(nt, qp_num); |
e26a5843 AH |
982 | |
983 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
984 | qp->qp_num = qp_num; |
985 | qp->transport = nt; | |
986 | qp->ndev = nt->ndev; | |
e26a5843 | 987 | qp->client_ready = false; |
fce8a7bb | 988 | qp->event_handler = NULL; |
2849b5d7 | 989 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 990 | |
8e8496e0 | 991 | if (mw_num < qp_count % mw_count) |
e26a5843 | 992 | num_qps_mw = qp_count / mw_count + 1; |
ef114ed5 | 993 | else |
e26a5843 AH |
994 | num_qps_mw = qp_count / mw_count; |
995 | ||
996 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
997 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 998 | |
e26a5843 | 999 | tx_size = (unsigned int)mw_size / num_qps_mw; |
c92ba3c5 | 1000 | qp_offset = tx_size * (qp_num / mw_count); |
e26a5843 AH |
1001 | |
1002 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
1003 | if (!qp->tx_mw) |
1004 | return -EINVAL; | |
1005 | ||
e26a5843 | 1006 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
1007 | if (!qp->tx_mw_phys) |
1008 | return -EINVAL; | |
1009 | ||
793c20e9 | 1010 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 1011 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 1012 | |
c9d534c8 JM |
1013 | /* Due to housekeeping, there must be atleast 2 buffs */ |
1014 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 1015 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 1016 | |
c8650fd0 | 1017 | if (nt->debugfs_node_dir) { |
fce8a7bb JM |
1018 | char debugfs_name[4]; |
1019 | ||
1020 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
1021 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
c8650fd0 | 1022 | nt->debugfs_node_dir); |
fce8a7bb JM |
1023 | |
1024 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
1025 | qp->debugfs_dir, qp, | |
1026 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
1027 | } else { |
1028 | qp->debugfs_dir = NULL; | |
1029 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
1030 | } |
1031 | ||
1032 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 1033 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb | 1034 | |
da2e5ae5 | 1035 | spin_lock_init(&qp->ntb_rx_q_lock); |
fce8a7bb JM |
1036 | spin_lock_init(&qp->ntb_tx_free_q_lock); |
1037 | ||
da2e5ae5 | 1038 | INIT_LIST_HEAD(&qp->rx_post_q); |
fce8a7bb JM |
1039 | INIT_LIST_HEAD(&qp->rx_pend_q); |
1040 | INIT_LIST_HEAD(&qp->rx_free_q); | |
1041 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 1042 | |
e26a5843 AH |
1043 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
1044 | (unsigned long)qp); | |
1045 | ||
282a2fee | 1046 | return 0; |
fce8a7bb JM |
1047 | } |
1048 | ||
e26a5843 | 1049 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1050 | { |
e26a5843 AH |
1051 | struct ntb_transport_ctx *nt; |
1052 | struct ntb_transport_mw *mw; | |
b17faba0 | 1053 | unsigned int mw_count, qp_count, spad_count, max_mw_count_for_spads; |
e26a5843 | 1054 | u64 qp_bitmap; |
1199aa61 | 1055 | int node; |
fce8a7bb JM |
1056 | int rc, i; |
1057 | ||
19645a07 | 1058 | mw_count = ntb_mw_count(ndev); |
19645a07 | 1059 | |
e26a5843 AH |
1060 | if (ntb_db_is_unsafe(ndev)) |
1061 | dev_dbg(&ndev->dev, | |
1062 | "doorbell is unsafe, proceed anyway...\n"); | |
1063 | if (ntb_spad_is_unsafe(ndev)) | |
1064 | dev_dbg(&ndev->dev, | |
1065 | "scratchpad is unsafe, proceed anyway...\n"); | |
1066 | ||
1199aa61 AH |
1067 | node = dev_to_node(&ndev->dev); |
1068 | ||
1069 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
1070 | if (!nt) |
1071 | return -ENOMEM; | |
1072 | ||
e26a5843 | 1073 | nt->ndev = ndev; |
b17faba0 SS |
1074 | spad_count = ntb_spad_count(ndev); |
1075 | ||
1076 | /* Limit the MW's based on the availability of scratchpads */ | |
1077 | ||
1078 | if (spad_count < NTB_TRANSPORT_MIN_SPADS) { | |
1079 | nt->mw_count = 0; | |
1080 | rc = -EINVAL; | |
1081 | goto err; | |
1082 | } | |
e26a5843 | 1083 | |
b17faba0 SS |
1084 | max_mw_count_for_spads = (spad_count - MW0_SZ_HIGH) / 2; |
1085 | nt->mw_count = min(mw_count, max_mw_count_for_spads); | |
e26a5843 | 1086 | |
1199aa61 AH |
1087 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
1088 | GFP_KERNEL, node); | |
e26a5843 AH |
1089 | if (!nt->mw_vec) { |
1090 | rc = -ENOMEM; | |
fce8a7bb JM |
1091 | goto err; |
1092 | } | |
1093 | ||
e26a5843 AH |
1094 | for (i = 0; i < mw_count; i++) { |
1095 | mw = &nt->mw_vec[i]; | |
1096 | ||
1097 | rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, | |
1098 | &mw->xlat_align, &mw->xlat_align_size); | |
1099 | if (rc) | |
1100 | goto err1; | |
1101 | ||
06917f75 | 1102 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
1103 | if (!mw->vbase) { |
1104 | rc = -ENOMEM; | |
1105 | goto err1; | |
1106 | } | |
1107 | ||
1108 | mw->buff_size = 0; | |
1109 | mw->xlat_size = 0; | |
1110 | mw->virt_addr = NULL; | |
1111 | mw->dma_addr = 0; | |
948d3a65 JM |
1112 | } |
1113 | ||
e26a5843 AH |
1114 | qp_bitmap = ntb_db_valid_mask(ndev); |
1115 | ||
1116 | qp_count = ilog2(qp_bitmap); | |
1117 | if (max_num_clients && max_num_clients < qp_count) | |
1118 | qp_count = max_num_clients; | |
cb827ee6 LG |
1119 | else if (nt->mw_count < qp_count) |
1120 | qp_count = nt->mw_count; | |
e26a5843 AH |
1121 | |
1122 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1123 | ||
1124 | nt->qp_count = qp_count; | |
1125 | nt->qp_bitmap = qp_bitmap; | |
1126 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1127 | |
1199aa61 AH |
1128 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1129 | GFP_KERNEL, node); | |
e26a5843 | 1130 | if (!nt->qp_vec) { |
fce8a7bb | 1131 | rc = -ENOMEM; |
d4adee09 | 1132 | goto err1; |
fce8a7bb JM |
1133 | } |
1134 | ||
c8650fd0 DJ |
1135 | if (nt_debugfs_dir) { |
1136 | nt->debugfs_node_dir = | |
1137 | debugfs_create_dir(pci_name(ndev->pdev), | |
1138 | nt_debugfs_dir); | |
1139 | } | |
1140 | ||
e26a5843 | 1141 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1142 | rc = ntb_transport_init_queue(nt, i); |
1143 | if (rc) | |
d4adee09 | 1144 | goto err2; |
282a2fee | 1145 | } |
fce8a7bb JM |
1146 | |
1147 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1148 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1149 | |
e26a5843 | 1150 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1151 | if (rc) |
d4adee09 | 1152 | goto err2; |
fce8a7bb JM |
1153 | |
1154 | INIT_LIST_HEAD(&nt->client_devs); | |
1155 | rc = ntb_bus_init(nt); | |
1156 | if (rc) | |
d4adee09 | 1157 | goto err3; |
fce8a7bb | 1158 | |
e26a5843 AH |
1159 | nt->link_is_up = false; |
1160 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1161 | ntb_link_event(ndev); | |
fce8a7bb JM |
1162 | |
1163 | return 0; | |
1164 | ||
948d3a65 | 1165 | err3: |
d4adee09 | 1166 | ntb_clear_ctx(ndev); |
948d3a65 | 1167 | err2: |
d4adee09 | 1168 | kfree(nt->qp_vec); |
fce8a7bb | 1169 | err1: |
e26a5843 AH |
1170 | while (i--) { |
1171 | mw = &nt->mw_vec[i]; | |
1172 | iounmap(mw->vbase); | |
1173 | } | |
d4adee09 | 1174 | kfree(nt->mw_vec); |
fce8a7bb | 1175 | err: |
fce8a7bb JM |
1176 | kfree(nt); |
1177 | return rc; | |
1178 | } | |
1179 | ||
e26a5843 | 1180 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1181 | { |
e26a5843 AH |
1182 | struct ntb_transport_ctx *nt = ndev->ctx; |
1183 | struct ntb_transport_qp *qp; | |
1184 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1185 | int i; |
1186 | ||
fca4d518 | 1187 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1188 | cancel_work_sync(&nt->link_cleanup); |
1189 | cancel_delayed_work_sync(&nt->link_work); | |
1190 | ||
1191 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1192 | |
1193 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1194 | for (i = 0; i < nt->qp_count; i++) { |
1195 | qp = &nt->qp_vec[i]; | |
1196 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1197 | ntb_transport_free_queue(qp); | |
1198 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1199 | } |
fce8a7bb | 1200 | |
e26a5843 AH |
1201 | ntb_link_disable(ndev); |
1202 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1203 | |
e26a5843 | 1204 | ntb_bus_remove(nt); |
fce8a7bb | 1205 | |
e26a5843 | 1206 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1207 | ntb_free_mw(nt, i); |
e26a5843 AH |
1208 | iounmap(nt->mw_vec[i].vbase); |
1209 | } | |
fce8a7bb | 1210 | |
e26a5843 AH |
1211 | kfree(nt->qp_vec); |
1212 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1213 | kfree(nt); |
1214 | } | |
1215 | ||
da2e5ae5 | 1216 | static void ntb_complete_rxc(struct ntb_transport_qp *qp) |
fce8a7bb | 1217 | { |
da2e5ae5 AH |
1218 | struct ntb_queue_entry *entry; |
1219 | void *cb_data; | |
1220 | unsigned int len; | |
1221 | unsigned long irqflags; | |
1222 | ||
1223 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1224 | ||
1225 | while (!list_empty(&qp->rx_post_q)) { | |
1226 | entry = list_first_entry(&qp->rx_post_q, | |
1227 | struct ntb_queue_entry, entry); | |
1228 | if (!(entry->flags & DESC_DONE_FLAG)) | |
1229 | break; | |
1230 | ||
1231 | entry->rx_hdr->flags = 0; | |
72203572 | 1232 | iowrite32(entry->rx_index, &qp->rx_info->entry); |
da2e5ae5 AH |
1233 | |
1234 | cb_data = entry->cb_data; | |
1235 | len = entry->len; | |
1236 | ||
1237 | list_move_tail(&entry->entry, &qp->rx_free_q); | |
1238 | ||
1239 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); | |
1240 | ||
1241 | if (qp->rx_handler && qp->client_ready) | |
1242 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
1243 | ||
1244 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1245 | } | |
282a2fee | 1246 | |
da2e5ae5 AH |
1247 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
1248 | } | |
fce8a7bb | 1249 | |
72203572 DJ |
1250 | static void ntb_rx_copy_callback(void *data, |
1251 | const struct dmaengine_result *res) | |
da2e5ae5 AH |
1252 | { |
1253 | struct ntb_queue_entry *entry = data; | |
fce8a7bb | 1254 | |
72203572 DJ |
1255 | /* we need to check DMA results if we are using DMA */ |
1256 | if (res) { | |
1257 | enum dmaengine_tx_result dma_err = res->result; | |
1258 | ||
1259 | switch (dma_err) { | |
1260 | case DMA_TRANS_READ_FAILED: | |
1261 | case DMA_TRANS_WRITE_FAILED: | |
1262 | entry->errors++; | |
1263 | case DMA_TRANS_ABORTED: | |
1264 | { | |
1265 | struct ntb_transport_qp *qp = entry->qp; | |
1266 | void *offset = qp->rx_buff + qp->rx_max_frame * | |
1267 | qp->rx_index; | |
1268 | ||
1269 | ntb_memcpy_rx(entry, offset); | |
1270 | qp->rx_memcpy++; | |
1271 | return; | |
1272 | } | |
1273 | ||
1274 | case DMA_TRANS_NOERROR: | |
1275 | default: | |
1276 | break; | |
1277 | } | |
1278 | } | |
1279 | ||
da2e5ae5 | 1280 | entry->flags |= DESC_DONE_FLAG; |
448c6fb3 | 1281 | |
da2e5ae5 | 1282 | ntb_complete_rxc(entry->qp); |
fce8a7bb JM |
1283 | } |
1284 | ||
282a2fee JM |
1285 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1286 | { | |
1287 | void *buf = entry->buf; | |
1288 | size_t len = entry->len; | |
1289 | ||
1290 | memcpy(buf, offset, len); | |
1291 | ||
e26a5843 AH |
1292 | /* Ensure that the data is fully copied out before clearing the flag */ |
1293 | wmb(); | |
1294 | ||
72203572 | 1295 | ntb_rx_copy_callback(entry, NULL); |
282a2fee JM |
1296 | } |
1297 | ||
72203572 | 1298 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset) |
282a2fee JM |
1299 | { |
1300 | struct dma_async_tx_descriptor *txd; | |
1301 | struct ntb_transport_qp *qp = entry->qp; | |
569410ca | 1302 | struct dma_chan *chan = qp->rx_dma_chan; |
282a2fee | 1303 | struct dma_device *device; |
da2e5ae5 | 1304 | size_t pay_off, buff_off, len; |
6f57fd05 | 1305 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1306 | dma_cookie_t cookie; |
1307 | void *buf = entry->buf; | |
282a2fee | 1308 | |
da2e5ae5 | 1309 | len = entry->len; |
282a2fee | 1310 | device = chan->device; |
e26a5843 AH |
1311 | pay_off = (size_t)offset & ~PAGE_MASK; |
1312 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1313 | |
1314 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
905921e7 | 1315 | goto err; |
282a2fee | 1316 | |
6f57fd05 BZ |
1317 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1318 | if (!unmap) | |
905921e7 | 1319 | goto err; |
282a2fee | 1320 | |
6f57fd05 BZ |
1321 | unmap->len = len; |
1322 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1323 | pay_off, len, DMA_TO_DEVICE); | |
1324 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1325 | goto err_get_unmap; | |
1326 | ||
1327 | unmap->to_cnt = 1; | |
282a2fee | 1328 | |
6f57fd05 BZ |
1329 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1330 | buff_off, len, DMA_FROM_DEVICE); | |
1331 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1332 | goto err_get_unmap; | |
1333 | ||
1334 | unmap->from_cnt = 1; | |
1335 | ||
88931ec3 AH |
1336 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
1337 | unmap->addr[0], len, | |
1338 | DMA_PREP_INTERRUPT); | |
1339 | if (!txd) | |
6f57fd05 | 1340 | goto err_get_unmap; |
282a2fee | 1341 | |
72203572 | 1342 | txd->callback_result = ntb_rx_copy_callback; |
282a2fee | 1343 | txd->callback_param = entry; |
6f57fd05 | 1344 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1345 | |
1346 | cookie = dmaengine_submit(txd); | |
1347 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1348 | goto err_set_unmap; |
1349 | ||
1350 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1351 | |
1352 | qp->last_cookie = cookie; | |
1353 | ||
1354 | qp->rx_async++; | |
1355 | ||
72203572 | 1356 | return 0; |
282a2fee | 1357 | |
6f57fd05 BZ |
1358 | err_set_unmap: |
1359 | dmaengine_unmap_put(unmap); | |
1360 | err_get_unmap: | |
1361 | dmaengine_unmap_put(unmap); | |
72203572 DJ |
1362 | err: |
1363 | return -ENXIO; | |
1364 | } | |
1365 | ||
1366 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) | |
1367 | { | |
1368 | struct ntb_transport_qp *qp = entry->qp; | |
1369 | struct dma_chan *chan = qp->rx_dma_chan; | |
1370 | int res; | |
1371 | ||
1372 | if (!chan) | |
1373 | goto err; | |
1374 | ||
1375 | if (entry->len < copy_bytes) | |
1376 | goto err; | |
1377 | ||
1378 | res = ntb_async_rx_submit(entry, offset); | |
1379 | if (res < 0) | |
1380 | goto err; | |
1381 | ||
1382 | if (!entry->retries) | |
1383 | qp->rx_async++; | |
1384 | ||
1385 | return; | |
1386 | ||
282a2fee JM |
1387 | err: |
1388 | ntb_memcpy_rx(entry, offset); | |
1389 | qp->rx_memcpy++; | |
1390 | } | |
1391 | ||
fce8a7bb JM |
1392 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1393 | { | |
1394 | struct ntb_payload_header *hdr; | |
1395 | struct ntb_queue_entry *entry; | |
1396 | void *offset; | |
1397 | ||
793c20e9 JM |
1398 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1399 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1400 | ||
e26a5843 AH |
1401 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1402 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1403 | |
fce8a7bb | 1404 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1405 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1406 | qp->rx_ring_empty++; |
1407 | return -EAGAIN; | |
1408 | } | |
1409 | ||
e26a5843 AH |
1410 | if (hdr->flags & LINK_DOWN_FLAG) { |
1411 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1412 | ntb_qp_link_down(qp); | |
1413 | hdr->flags = 0; | |
c0900b33 | 1414 | return -EAGAIN; |
e26a5843 AH |
1415 | } |
1416 | ||
1417 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1418 | dev_dbg(&qp->ndev->pdev->dev, | |
1419 | "version mismatch, expected %llu - got %u\n", | |
1420 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1421 | qp->rx_err_ver++; |
1422 | return -EIO; | |
1423 | } | |
1424 | ||
da2e5ae5 | 1425 | entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); |
e26a5843 AH |
1426 | if (!entry) { |
1427 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1428 | qp->rx_err_no_buf++; | |
da2e5ae5 | 1429 | return -EAGAIN; |
fce8a7bb JM |
1430 | } |
1431 | ||
da2e5ae5 | 1432 | entry->rx_hdr = hdr; |
72203572 | 1433 | entry->rx_index = qp->rx_index; |
da2e5ae5 | 1434 | |
282a2fee | 1435 | if (hdr->len > entry->len) { |
e26a5843 AH |
1436 | dev_dbg(&qp->ndev->pdev->dev, |
1437 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1438 | hdr->len, entry->len); |
e26a5843 | 1439 | qp->rx_err_oflow++; |
282a2fee | 1440 | |
da2e5ae5 AH |
1441 | entry->len = -EIO; |
1442 | entry->flags |= DESC_DONE_FLAG; | |
fce8a7bb | 1443 | |
da2e5ae5 AH |
1444 | ntb_complete_rxc(qp); |
1445 | } else { | |
1446 | dev_dbg(&qp->ndev->pdev->dev, | |
1447 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1448 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
e26a5843 | 1449 | |
da2e5ae5 AH |
1450 | qp->rx_bytes += hdr->len; |
1451 | qp->rx_pkts++; | |
e26a5843 | 1452 | |
da2e5ae5 | 1453 | entry->len = hdr->len; |
282a2fee | 1454 | |
da2e5ae5 AH |
1455 | ntb_async_rx(entry, offset); |
1456 | } | |
fce8a7bb | 1457 | |
282a2fee JM |
1458 | qp->rx_index++; |
1459 | qp->rx_index %= qp->rx_max_entry; | |
1460 | ||
1461 | return 0; | |
fce8a7bb JM |
1462 | } |
1463 | ||
e26a5843 | 1464 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1465 | { |
e26a5843 | 1466 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1467 | int rc, i; |
fce8a7bb | 1468 | |
e26a5843 AH |
1469 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1470 | __func__, qp->qp_num); | |
e8aeb60c | 1471 | |
c336acd3 JM |
1472 | /* Limit the number of packets processed in a single interrupt to |
1473 | * provide fairness to others | |
1474 | */ | |
1475 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1476 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1477 | if (rc) |
1478 | break; | |
1479 | } | |
282a2fee | 1480 | |
569410ca DJ |
1481 | if (i && qp->rx_dma_chan) |
1482 | dma_async_issue_pending(qp->rx_dma_chan); | |
fce8a7bb | 1483 | |
e26a5843 AH |
1484 | if (i == qp->rx_max_entry) { |
1485 | /* there is more work to do */ | |
e9021331 DJ |
1486 | if (qp->active) |
1487 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
1488 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { |
1489 | /* the doorbell bit is set: clear it */ | |
1490 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1491 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1492 | ntb_db_read(qp->ndev); | |
1493 | ||
1494 | /* an interrupt may have arrived between finishing | |
1495 | * ntb_process_rxc and clearing the doorbell bit: | |
1496 | * there might be some more work to do. | |
1497 | */ | |
e9021331 DJ |
1498 | if (qp->active) |
1499 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 1500 | } |
fce8a7bb JM |
1501 | } |
1502 | ||
9cabc269 DJ |
1503 | static void ntb_tx_copy_callback(void *data, |
1504 | const struct dmaengine_result *res) | |
fce8a7bb | 1505 | { |
282a2fee JM |
1506 | struct ntb_queue_entry *entry = data; |
1507 | struct ntb_transport_qp *qp = entry->qp; | |
1508 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1509 | |
9cabc269 DJ |
1510 | /* we need to check DMA results if we are using DMA */ |
1511 | if (res) { | |
1512 | enum dmaengine_tx_result dma_err = res->result; | |
1513 | ||
1514 | switch (dma_err) { | |
1515 | case DMA_TRANS_READ_FAILED: | |
1516 | case DMA_TRANS_WRITE_FAILED: | |
1517 | entry->errors++; | |
1518 | case DMA_TRANS_ABORTED: | |
1519 | { | |
1520 | void __iomem *offset = | |
1521 | qp->tx_mw + qp->tx_max_frame * | |
1522 | entry->tx_index; | |
1523 | ||
1524 | /* resubmit via CPU */ | |
1525 | ntb_memcpy_tx(entry, offset); | |
1526 | qp->tx_memcpy++; | |
1527 | return; | |
1528 | } | |
1529 | ||
1530 | case DMA_TRANS_NOERROR: | |
1531 | default: | |
1532 | break; | |
1533 | } | |
1534 | } | |
1535 | ||
74465645 | 1536 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1537 | |
e26a5843 | 1538 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1539 | |
1540 | /* The entry length can only be zero if the packet is intended to be a | |
1541 | * "link down" or similar. Since no payload is being sent in these | |
1542 | * cases, there is nothing to add to the completion queue. | |
1543 | */ | |
1544 | if (entry->len > 0) { | |
1545 | qp->tx_bytes += entry->len; | |
1546 | ||
1547 | if (qp->tx_handler) | |
1548 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1549 | entry->len); | |
1550 | } | |
1551 | ||
1552 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1553 | } | |
1554 | ||
282a2fee | 1555 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1556 | { |
06917f75 DJ |
1557 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1558 | /* | |
1559 | * Using non-temporal mov to improve performance on non-cached | |
1560 | * writes, even though we aren't actually copying from user space. | |
1561 | */ | |
1562 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1563 | #else | |
282a2fee | 1564 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1565 | #endif |
282a2fee | 1566 | |
e26a5843 AH |
1567 | /* Ensure that the data is fully copied out before setting the flags */ |
1568 | wmb(); | |
1569 | ||
9cabc269 | 1570 | ntb_tx_copy_callback(entry, NULL); |
282a2fee JM |
1571 | } |
1572 | ||
9cabc269 DJ |
1573 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
1574 | struct ntb_queue_entry *entry) | |
282a2fee | 1575 | { |
282a2fee | 1576 | struct dma_async_tx_descriptor *txd; |
569410ca | 1577 | struct dma_chan *chan = qp->tx_dma_chan; |
282a2fee | 1578 | struct dma_device *device; |
9cabc269 DJ |
1579 | size_t len = entry->len; |
1580 | void *buf = entry->buf; | |
282a2fee | 1581 | size_t dest_off, buff_off; |
6f57fd05 BZ |
1582 | struct dmaengine_unmap_data *unmap; |
1583 | dma_addr_t dest; | |
282a2fee | 1584 | dma_cookie_t cookie; |
fce8a7bb | 1585 | |
282a2fee | 1586 | device = chan->device; |
9cabc269 | 1587 | dest = qp->tx_mw_phys + qp->tx_max_frame * entry->tx_index; |
e26a5843 AH |
1588 | buff_off = (size_t)buf & ~PAGE_MASK; |
1589 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1590 | |
1591 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1592 | goto err; | |
1593 | ||
6f57fd05 BZ |
1594 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1595 | if (!unmap) | |
282a2fee JM |
1596 | goto err; |
1597 | ||
6f57fd05 BZ |
1598 | unmap->len = len; |
1599 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1600 | buff_off, len, DMA_TO_DEVICE); | |
1601 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1602 | goto err_get_unmap; | |
1603 | ||
1604 | unmap->to_cnt = 1; | |
1605 | ||
88931ec3 AH |
1606 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
1607 | DMA_PREP_INTERRUPT); | |
1608 | if (!txd) | |
6f57fd05 | 1609 | goto err_get_unmap; |
282a2fee | 1610 | |
9cabc269 | 1611 | txd->callback_result = ntb_tx_copy_callback; |
282a2fee | 1612 | txd->callback_param = entry; |
6f57fd05 | 1613 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1614 | |
1615 | cookie = dmaengine_submit(txd); | |
1616 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1617 | goto err_set_unmap; |
1618 | ||
1619 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1620 | |
1621 | dma_async_issue_pending(chan); | |
282a2fee | 1622 | |
9cabc269 | 1623 | return 0; |
6f57fd05 BZ |
1624 | err_set_unmap: |
1625 | dmaengine_unmap_put(unmap); | |
1626 | err_get_unmap: | |
1627 | dmaengine_unmap_put(unmap); | |
9cabc269 DJ |
1628 | err: |
1629 | return -ENXIO; | |
1630 | } | |
1631 | ||
1632 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1633 | struct ntb_queue_entry *entry) | |
1634 | { | |
1635 | struct ntb_payload_header __iomem *hdr; | |
1636 | struct dma_chan *chan = qp->tx_dma_chan; | |
1637 | void __iomem *offset; | |
1638 | int res; | |
1639 | ||
1640 | entry->tx_index = qp->tx_index; | |
1641 | offset = qp->tx_mw + qp->tx_max_frame * entry->tx_index; | |
1642 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1643 | entry->tx_hdr = hdr; | |
1644 | ||
1645 | iowrite32(entry->len, &hdr->len); | |
1646 | iowrite32((u32)qp->tx_pkts, &hdr->ver); | |
1647 | ||
1648 | if (!chan) | |
1649 | goto err; | |
1650 | ||
1651 | if (entry->len < copy_bytes) | |
1652 | goto err; | |
1653 | ||
1654 | res = ntb_async_tx_submit(qp, entry); | |
1655 | if (res < 0) | |
1656 | goto err; | |
1657 | ||
1658 | if (!entry->retries) | |
1659 | qp->tx_async++; | |
1660 | ||
1661 | return; | |
1662 | ||
282a2fee JM |
1663 | err: |
1664 | ntb_memcpy_tx(entry, offset); | |
1665 | qp->tx_memcpy++; | |
1666 | } | |
1667 | ||
1668 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1669 | struct ntb_queue_entry *entry) | |
1670 | { | |
793c20e9 | 1671 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1672 | qp->tx_ring_full++; |
1673 | return -EAGAIN; | |
1674 | } | |
1675 | ||
ef114ed5 | 1676 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb | 1677 | if (qp->tx_handler) |
179f912a | 1678 | qp->tx_handler(qp, qp->cb_data, NULL, -EIO); |
fce8a7bb JM |
1679 | |
1680 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1681 | &qp->tx_free_q); | |
1682 | return 0; | |
1683 | } | |
1684 | ||
282a2fee | 1685 | ntb_async_tx(qp, entry); |
fce8a7bb | 1686 | |
793c20e9 JM |
1687 | qp->tx_index++; |
1688 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1689 | |
1690 | qp->tx_pkts++; | |
1691 | ||
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1696 | { | |
e26a5843 | 1697 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1698 | struct ntb_queue_entry *entry; |
1699 | int i, rc; | |
1700 | ||
e26a5843 | 1701 | if (!qp->link_is_up) |
fce8a7bb JM |
1702 | return; |
1703 | ||
e22e0b9d | 1704 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1705 | |
1706 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1707 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1708 | if (entry) |
1709 | break; | |
1710 | msleep(100); | |
1711 | } | |
1712 | ||
1713 | if (!entry) | |
1714 | return; | |
1715 | ||
1716 | entry->cb_data = NULL; | |
1717 | entry->buf = NULL; | |
1718 | entry->len = 0; | |
1719 | entry->flags = LINK_DOWN_FLAG; | |
1720 | ||
1721 | rc = ntb_process_tx(qp, entry); | |
1722 | if (rc) | |
1723 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1724 | qp->qp_num); | |
2849b5d7 AH |
1725 | |
1726 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1727 | } |
1728 | ||
1199aa61 AH |
1729 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1730 | { | |
1731 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1732 | } | |
1733 | ||
fce8a7bb JM |
1734 | /** |
1735 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1736 | * @rx_handler: receive callback function | |
1737 | * @tx_handler: transmit callback function | |
1738 | * @event_handler: event callback function | |
1739 | * | |
1740 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1741 | * routine for both transmit and receive. The receive callback routine will be | |
1742 | * used to pass up data when the transport has received it on the queue. The | |
1743 | * transmit callback routine will be called when the transport has completed the | |
1744 | * transmission of the data on the queue and the data is ready to be freed. | |
1745 | * | |
1746 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1747 | */ | |
1748 | struct ntb_transport_qp * | |
e26a5843 | 1749 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1750 | const struct ntb_queue_handlers *handlers) |
1751 | { | |
e26a5843 AH |
1752 | struct ntb_dev *ndev; |
1753 | struct pci_dev *pdev; | |
1754 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1755 | struct ntb_queue_entry *entry; |
1756 | struct ntb_transport_qp *qp; | |
e26a5843 | 1757 | u64 qp_bit; |
fce8a7bb | 1758 | unsigned int free_queue; |
1199aa61 AH |
1759 | dma_cap_mask_t dma_mask; |
1760 | int node; | |
e26a5843 | 1761 | int i; |
fce8a7bb | 1762 | |
e26a5843 AH |
1763 | ndev = dev_ntb(client_dev->parent); |
1764 | pdev = ndev->pdev; | |
1765 | nt = ndev->ctx; | |
fce8a7bb | 1766 | |
1199aa61 AH |
1767 | node = dev_to_node(&ndev->dev); |
1768 | ||
8fcd0950 | 1769 | free_queue = ffs(nt->qp_bitmap_free); |
fce8a7bb JM |
1770 | if (!free_queue) |
1771 | goto err; | |
1772 | ||
1773 | /* decrement free_queue to make it zero based */ | |
1774 | free_queue--; | |
1775 | ||
e26a5843 AH |
1776 | qp = &nt->qp_vec[free_queue]; |
1777 | qp_bit = BIT_ULL(qp->qp_num); | |
1778 | ||
1779 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1780 | |
fce8a7bb JM |
1781 | qp->cb_data = data; |
1782 | qp->rx_handler = handlers->rx_handler; | |
1783 | qp->tx_handler = handlers->tx_handler; | |
1784 | qp->event_handler = handlers->event_handler; | |
1785 | ||
1199aa61 AH |
1786 | dma_cap_zero(dma_mask); |
1787 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1788 | ||
a41ef053 | 1789 | if (use_dma) { |
569410ca DJ |
1790 | qp->tx_dma_chan = |
1791 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1792 | (void *)(unsigned long)node); | |
1793 | if (!qp->tx_dma_chan) | |
1794 | dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n"); | |
1795 | ||
1796 | qp->rx_dma_chan = | |
1797 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1798 | (void *)(unsigned long)node); | |
1799 | if (!qp->rx_dma_chan) | |
1800 | dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n"); | |
a41ef053 | 1801 | } else { |
569410ca DJ |
1802 | qp->tx_dma_chan = NULL; |
1803 | qp->rx_dma_chan = NULL; | |
a41ef053 | 1804 | } |
569410ca DJ |
1805 | |
1806 | dev_dbg(&pdev->dev, "Using %s memcpy for TX\n", | |
1807 | qp->tx_dma_chan ? "DMA" : "CPU"); | |
1808 | ||
1809 | dev_dbg(&pdev->dev, "Using %s memcpy for RX\n", | |
1810 | qp->rx_dma_chan ? "DMA" : "CPU"); | |
282a2fee | 1811 | |
fce8a7bb | 1812 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1813 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1814 | if (!entry) |
1815 | goto err1; | |
1816 | ||
282a2fee | 1817 | entry->qp = qp; |
da2e5ae5 | 1818 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
f766755c | 1819 | &qp->rx_free_q); |
fce8a7bb | 1820 | } |
a754a8fc | 1821 | qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; |
fce8a7bb | 1822 | |
a754a8fc | 1823 | for (i = 0; i < qp->tx_max_entry; i++) { |
1199aa61 | 1824 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1825 | if (!entry) |
1826 | goto err2; | |
1827 | ||
282a2fee | 1828 | entry->qp = qp; |
fce8a7bb | 1829 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1830 | &qp->tx_free_q); |
fce8a7bb JM |
1831 | } |
1832 | ||
e26a5843 AH |
1833 | ntb_db_clear(qp->ndev, qp_bit); |
1834 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1835 | |
1836 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1837 | ||
1838 | return qp; | |
1839 | ||
fce8a7bb | 1840 | err2: |
f766755c | 1841 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1842 | kfree(entry); |
1843 | err1: | |
a754a8fc | 1844 | qp->rx_alloc_entry = 0; |
da2e5ae5 | 1845 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1846 | kfree(entry); |
569410ca DJ |
1847 | if (qp->tx_dma_chan) |
1848 | dma_release_channel(qp->tx_dma_chan); | |
1849 | if (qp->rx_dma_chan) | |
1850 | dma_release_channel(qp->rx_dma_chan); | |
e26a5843 | 1851 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1852 | err: |
1853 | return NULL; | |
1854 | } | |
1855 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1856 | ||
1857 | /** | |
1858 | * ntb_transport_free_queue - Frees NTB transport queue | |
1859 | * @qp: NTB queue to be freed | |
1860 | * | |
1861 | * Frees NTB transport queue | |
1862 | */ | |
1863 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1864 | { | |
186f27ff | 1865 | struct pci_dev *pdev; |
fce8a7bb | 1866 | struct ntb_queue_entry *entry; |
e26a5843 | 1867 | u64 qp_bit; |
fce8a7bb JM |
1868 | |
1869 | if (!qp) | |
1870 | return; | |
1871 | ||
e26a5843 | 1872 | pdev = qp->ndev->pdev; |
186f27ff | 1873 | |
e9021331 DJ |
1874 | qp->active = false; |
1875 | ||
569410ca DJ |
1876 | if (qp->tx_dma_chan) { |
1877 | struct dma_chan *chan = qp->tx_dma_chan; | |
1878 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1879 | * processed by the CPU instead of the DAM engine | |
1880 | */ | |
1881 | qp->tx_dma_chan = NULL; | |
1882 | ||
1883 | /* Try to be nice and wait for any queued DMA engine | |
1884 | * transactions to process before smashing it with a rock | |
1885 | */ | |
1886 | dma_sync_wait(chan, qp->last_cookie); | |
1887 | dmaengine_terminate_all(chan); | |
1888 | dma_release_channel(chan); | |
1889 | } | |
1890 | ||
1891 | if (qp->rx_dma_chan) { | |
1892 | struct dma_chan *chan = qp->rx_dma_chan; | |
282a2fee JM |
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 | */ | |
569410ca | 1896 | qp->rx_dma_chan = NULL; |
282a2fee JM |
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); | |
1199aa61 | 1903 | dma_release_channel(chan); |
282a2fee | 1904 | } |
fce8a7bb | 1905 | |
e26a5843 AH |
1906 | qp_bit = BIT_ULL(qp->qp_num); |
1907 | ||
1908 | ntb_db_set_mask(qp->ndev, qp_bit); | |
e9021331 | 1909 | tasklet_kill(&qp->rxc_db_work); |
fce8a7bb | 1910 | |
282a2fee JM |
1911 | cancel_delayed_work_sync(&qp->link_work); |
1912 | ||
e26a5843 AH |
1913 | qp->cb_data = NULL; |
1914 | qp->rx_handler = NULL; | |
1915 | qp->tx_handler = NULL; | |
1916 | qp->event_handler = NULL; | |
1917 | ||
da2e5ae5 | 1918 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1919 | kfree(entry); |
1920 | ||
da2e5ae5 AH |
1921 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) { |
1922 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n"); | |
1923 | kfree(entry); | |
1924 | } | |
1925 | ||
1926 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) { | |
1927 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n"); | |
fce8a7bb JM |
1928 | kfree(entry); |
1929 | } | |
1930 | ||
f766755c | 1931 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1932 | kfree(entry); |
1933 | ||
30a4bb1e | 1934 | qp->transport->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1935 | |
1936 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1937 | } | |
1938 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1939 | ||
1940 | /** | |
1941 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1942 | * @qp: NTB queue to be freed | |
1943 | * @len: pointer to variable to write enqueued buffers length | |
1944 | * | |
1945 | * Dequeues unused buffers from receive queue. Should only be used during | |
1946 | * shutdown of qp. | |
1947 | * | |
1948 | * RETURNS: NULL error value on error, or void* for success. | |
1949 | */ | |
1950 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1951 | { | |
1952 | struct ntb_queue_entry *entry; | |
1953 | void *buf; | |
1954 | ||
e26a5843 | 1955 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1956 | return NULL; |
1957 | ||
da2e5ae5 | 1958 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q); |
fce8a7bb JM |
1959 | if (!entry) |
1960 | return NULL; | |
1961 | ||
1962 | buf = entry->cb_data; | |
1963 | *len = entry->len; | |
1964 | ||
da2e5ae5 | 1965 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1966 | |
1967 | return buf; | |
1968 | } | |
1969 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1970 | ||
1971 | /** | |
1972 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1973 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1974 | * @cb: per buffer pointer for callback function to use | |
1975 | * @data: pointer to data buffer that incoming packets will be copied into | |
1976 | * @len: length of the data buffer | |
1977 | * | |
1978 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1979 | * payload can be received into. | |
1980 | * | |
1981 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1982 | */ | |
1983 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1984 | unsigned int len) | |
1985 | { | |
1986 | struct ntb_queue_entry *entry; | |
1987 | ||
1988 | if (!qp) | |
1989 | return -EINVAL; | |
1990 | ||
da2e5ae5 | 1991 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q); |
fce8a7bb JM |
1992 | if (!entry) |
1993 | return -ENOMEM; | |
1994 | ||
1995 | entry->cb_data = cb; | |
1996 | entry->buf = data; | |
1997 | entry->len = len; | |
da2e5ae5 | 1998 | entry->flags = 0; |
72203572 DJ |
1999 | entry->retries = 0; |
2000 | entry->errors = 0; | |
2001 | entry->rx_index = 0; | |
da2e5ae5 AH |
2002 | |
2003 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q); | |
fce8a7bb | 2004 | |
e9021331 DJ |
2005 | if (qp->active) |
2006 | tasklet_schedule(&qp->rxc_db_work); | |
fce8a7bb JM |
2007 | |
2008 | return 0; | |
2009 | } | |
2010 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
2011 | ||
2012 | /** | |
2013 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
2014 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
2015 | * @cb: per buffer pointer for callback function to use | |
2016 | * @data: pointer to data buffer that will be sent | |
2017 | * @len: length of the data buffer | |
2018 | * | |
2019 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 2020 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
2021 | * serialize access to the qp. |
2022 | * | |
2023 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2024 | */ | |
2025 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
2026 | unsigned int len) | |
2027 | { | |
2028 | struct ntb_queue_entry *entry; | |
2029 | int rc; | |
2030 | ||
e26a5843 | 2031 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
2032 | return -EINVAL; |
2033 | ||
2034 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
2035 | if (!entry) { |
2036 | qp->tx_err_no_buf++; | |
e74bfeed | 2037 | return -EBUSY; |
282a2fee | 2038 | } |
fce8a7bb JM |
2039 | |
2040 | entry->cb_data = cb; | |
2041 | entry->buf = data; | |
2042 | entry->len = len; | |
2043 | entry->flags = 0; | |
9cabc269 DJ |
2044 | entry->errors = 0; |
2045 | entry->retries = 0; | |
2046 | entry->tx_index = 0; | |
fce8a7bb JM |
2047 | |
2048 | rc = ntb_process_tx(qp, entry); | |
2049 | if (rc) | |
2050 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
2051 | &qp->tx_free_q); | |
2052 | ||
2053 | return rc; | |
2054 | } | |
2055 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
2056 | ||
2057 | /** | |
2058 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
2059 | * @qp: NTB transport layer queue to be enabled | |
2060 | * | |
2061 | * Notify NTB transport layer of client readiness to use queue | |
2062 | */ | |
2063 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
2064 | { | |
2065 | if (!qp) | |
2066 | return; | |
2067 | ||
e26a5843 | 2068 | qp->client_ready = true; |
fce8a7bb | 2069 | |
e26a5843 | 2070 | if (qp->transport->link_is_up) |
fce8a7bb JM |
2071 | schedule_delayed_work(&qp->link_work, 0); |
2072 | } | |
2073 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
2074 | ||
2075 | /** | |
2076 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
2077 | * @qp: NTB transport layer queue to be disabled | |
2078 | * | |
2079 | * Notify NTB transport layer of client's desire to no longer receive data on | |
2080 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 2081 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
2082 | */ |
2083 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
2084 | { | |
e26a5843 | 2085 | int val; |
fce8a7bb JM |
2086 | |
2087 | if (!qp) | |
2088 | return; | |
2089 | ||
e26a5843 | 2090 | qp->client_ready = false; |
fce8a7bb | 2091 | |
e26a5843 | 2092 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 2093 | |
e26a5843 AH |
2094 | ntb_peer_spad_write(qp->ndev, QP_LINKS, |
2095 | val & ~BIT(qp->qp_num)); | |
fce8a7bb | 2096 | |
e26a5843 | 2097 | if (qp->link_is_up) |
fce8a7bb JM |
2098 | ntb_send_link_down(qp); |
2099 | else | |
2100 | cancel_delayed_work_sync(&qp->link_work); | |
2101 | } | |
2102 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
2103 | ||
2104 | /** | |
2105 | * ntb_transport_link_query - Query transport link state | |
2106 | * @qp: NTB transport layer queue to be queried | |
2107 | * | |
2108 | * Query connectivity to the remote system of the NTB transport queue | |
2109 | * | |
2110 | * RETURNS: true for link up or false for link down | |
2111 | */ | |
2112 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
2113 | { | |
186f27ff JM |
2114 | if (!qp) |
2115 | return false; | |
2116 | ||
e26a5843 | 2117 | return qp->link_is_up; |
fce8a7bb JM |
2118 | } |
2119 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
2120 | ||
2121 | /** | |
2122 | * ntb_transport_qp_num - Query the qp number | |
2123 | * @qp: NTB transport layer queue to be queried | |
2124 | * | |
2125 | * Query qp number of the NTB transport queue | |
2126 | * | |
2127 | * RETURNS: a zero based number specifying the qp number | |
2128 | */ | |
2129 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
2130 | { | |
186f27ff JM |
2131 | if (!qp) |
2132 | return 0; | |
2133 | ||
fce8a7bb JM |
2134 | return qp->qp_num; |
2135 | } | |
2136 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
2137 | ||
2138 | /** | |
2139 | * ntb_transport_max_size - Query the max payload size of a qp | |
2140 | * @qp: NTB transport layer queue to be queried | |
2141 | * | |
2142 | * Query the maximum payload size permissible on the given qp | |
2143 | * | |
2144 | * RETURNS: the max payload size of a qp | |
2145 | */ | |
ef114ed5 | 2146 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 2147 | { |
04afde45 | 2148 | unsigned int max_size; |
569410ca | 2149 | unsigned int copy_align; |
04afde45 | 2150 | struct dma_chan *rx_chan, *tx_chan; |
282a2fee | 2151 | |
186f27ff JM |
2152 | if (!qp) |
2153 | return 0; | |
2154 | ||
04afde45 DJ |
2155 | rx_chan = qp->rx_dma_chan; |
2156 | tx_chan = qp->tx_dma_chan; | |
282a2fee | 2157 | |
04afde45 DJ |
2158 | copy_align = max(rx_chan ? rx_chan->device->copy_align : 0, |
2159 | tx_chan ? tx_chan->device->copy_align : 0); | |
569410ca | 2160 | |
282a2fee | 2161 | /* If DMA engine usage is possible, try to find the max size for that */ |
04afde45 DJ |
2162 | max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header); |
2163 | max_size = round_down(max_size, 1 << copy_align); | |
282a2fee | 2164 | |
04afde45 | 2165 | return max_size; |
fce8a7bb JM |
2166 | } |
2167 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 | 2168 | |
e74bfeed DJ |
2169 | unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp) |
2170 | { | |
2171 | unsigned int head = qp->tx_index; | |
2172 | unsigned int tail = qp->remote_rx_info->entry; | |
2173 | ||
2174 | return tail > head ? tail - head : qp->tx_max_entry + tail - head; | |
2175 | } | |
2176 | EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry); | |
2177 | ||
e26a5843 AH |
2178 | static void ntb_transport_doorbell_callback(void *data, int vector) |
2179 | { | |
2180 | struct ntb_transport_ctx *nt = data; | |
2181 | struct ntb_transport_qp *qp; | |
2182 | u64 db_bits; | |
2183 | unsigned int qp_num; | |
2184 | ||
2185 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
2186 | ntb_db_vector_mask(nt->ndev, vector)); | |
2187 | ||
2188 | while (db_bits) { | |
2189 | qp_num = __ffs(db_bits); | |
2190 | qp = &nt->qp_vec[qp_num]; | |
2191 | ||
e9021331 DJ |
2192 | if (qp->active) |
2193 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
2194 | |
2195 | db_bits &= ~BIT_ULL(qp_num); | |
2196 | } | |
2197 | } | |
2198 | ||
2199 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
2200 | .link_event = ntb_transport_event_callback, | |
2201 | .db_event = ntb_transport_doorbell_callback, | |
2202 | }; | |
2203 | ||
2204 | static struct ntb_client ntb_transport_client = { | |
2205 | .ops = { | |
2206 | .probe = ntb_transport_probe, | |
2207 | .remove = ntb_transport_free, | |
2208 | }, | |
2209 | }; | |
2210 | ||
2211 | static int __init ntb_transport_init(void) | |
2212 | { | |
2213 | int rc; | |
2214 | ||
7eb38781 DJ |
2215 | pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
2216 | ||
e26a5843 AH |
2217 | if (debugfs_initialized()) |
2218 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
2219 | ||
2220 | rc = bus_register(&ntb_transport_bus); | |
2221 | if (rc) | |
2222 | goto err_bus; | |
2223 | ||
2224 | rc = ntb_register_client(&ntb_transport_client); | |
2225 | if (rc) | |
2226 | goto err_client; | |
2227 | ||
2228 | return 0; | |
2229 | ||
2230 | err_client: | |
2231 | bus_unregister(&ntb_transport_bus); | |
2232 | err_bus: | |
2233 | debugfs_remove_recursive(nt_debugfs_dir); | |
2234 | return rc; | |
2235 | } | |
2236 | module_init(ntb_transport_init); | |
2237 | ||
2238 | static void __exit ntb_transport_exit(void) | |
2239 | { | |
e26a5843 AH |
2240 | ntb_unregister_client(&ntb_transport_client); |
2241 | bus_unregister(&ntb_transport_bus); | |
dd62245e | 2242 | debugfs_remove_recursive(nt_debugfs_dir); |
e26a5843 AH |
2243 | } |
2244 | module_exit(ntb_transport_exit); |