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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 | ||
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; | |
e26a5843 AH |
194 | void __iomem *vbase; |
195 | size_t xlat_size; | |
196 | size_t buff_size; | |
fce8a7bb JM |
197 | void *virt_addr; |
198 | dma_addr_t dma_addr; | |
199 | }; | |
200 | ||
201 | struct ntb_transport_client_dev { | |
202 | struct list_head entry; | |
e26a5843 | 203 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
204 | struct device dev; |
205 | }; | |
206 | ||
e26a5843 | 207 | struct ntb_transport_ctx { |
fce8a7bb JM |
208 | struct list_head entry; |
209 | struct list_head client_devs; | |
210 | ||
e26a5843 AH |
211 | struct ntb_dev *ndev; |
212 | ||
213 | struct ntb_transport_mw *mw_vec; | |
214 | struct ntb_transport_qp *qp_vec; | |
215 | unsigned int mw_count; | |
216 | unsigned int qp_count; | |
217 | u64 qp_bitmap; | |
218 | u64 qp_bitmap_free; | |
219 | ||
220 | bool link_is_up; | |
fce8a7bb | 221 | struct delayed_work link_work; |
7b4f2d3c | 222 | struct work_struct link_cleanup; |
c8650fd0 DJ |
223 | |
224 | struct dentry *debugfs_node_dir; | |
fce8a7bb JM |
225 | }; |
226 | ||
227 | enum { | |
e26a5843 AH |
228 | DESC_DONE_FLAG = BIT(0), |
229 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
230 | }; |
231 | ||
232 | struct ntb_payload_header { | |
74465645 | 233 | unsigned int ver; |
fce8a7bb JM |
234 | unsigned int len; |
235 | unsigned int flags; | |
236 | }; | |
237 | ||
238 | enum { | |
239 | VERSION = 0, | |
fce8a7bb | 240 | QP_LINKS, |
113fc505 JM |
241 | NUM_QPS, |
242 | NUM_MWS, | |
243 | MW0_SZ_HIGH, | |
244 | MW0_SZ_LOW, | |
fce8a7bb JM |
245 | }; |
246 | ||
e26a5843 AH |
247 | #define dev_client_dev(__dev) \ |
248 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
249 | ||
250 | #define drv_client(__drv) \ | |
251 | container_of((__drv), struct ntb_transport_client, driver) | |
252 | ||
253 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
254 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
255 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
256 | ||
e26a5843 AH |
257 | static void ntb_transport_rxc_db(unsigned long data); |
258 | static const struct ntb_ctx_ops ntb_transport_ops; | |
259 | static struct ntb_client ntb_transport_client; | |
9cabc269 DJ |
260 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
261 | struct ntb_queue_entry *entry); | |
262 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset); | |
72203572 DJ |
263 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset); |
264 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset); | |
265 | ||
e26a5843 AH |
266 | |
267 | static int ntb_transport_bus_match(struct device *dev, | |
268 | struct device_driver *drv) | |
fce8a7bb JM |
269 | { |
270 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
271 | } | |
272 | ||
e26a5843 | 273 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 274 | { |
e26a5843 | 275 | const struct ntb_transport_client *client; |
fce8a7bb JM |
276 | int rc = -EINVAL; |
277 | ||
278 | get_device(dev); | |
e26a5843 AH |
279 | |
280 | client = drv_client(dev->driver); | |
281 | rc = client->probe(dev); | |
fce8a7bb JM |
282 | if (rc) |
283 | put_device(dev); | |
284 | ||
285 | return rc; | |
286 | } | |
287 | ||
e26a5843 | 288 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 289 | { |
e26a5843 | 290 | const struct ntb_transport_client *client; |
fce8a7bb | 291 | |
e26a5843 AH |
292 | client = drv_client(dev->driver); |
293 | client->remove(dev); | |
fce8a7bb JM |
294 | |
295 | put_device(dev); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
e26a5843 AH |
300 | static struct bus_type ntb_transport_bus = { |
301 | .name = "ntb_transport", | |
302 | .match = ntb_transport_bus_match, | |
303 | .probe = ntb_transport_bus_probe, | |
304 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
305 | }; |
306 | ||
307 | static LIST_HEAD(ntb_transport_list); | |
308 | ||
e26a5843 | 309 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 310 | { |
31510000 | 311 | list_add_tail(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
312 | return 0; |
313 | } | |
314 | ||
e26a5843 | 315 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
316 | { |
317 | struct ntb_transport_client_dev *client_dev, *cd; | |
318 | ||
319 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
320 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
321 | dev_name(&client_dev->dev)); | |
322 | list_del(&client_dev->entry); | |
323 | device_unregister(&client_dev->dev); | |
324 | } | |
325 | ||
326 | list_del(&nt->entry); | |
fce8a7bb JM |
327 | } |
328 | ||
e26a5843 | 329 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
330 | { |
331 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 332 | |
e26a5843 | 333 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
334 | kfree(client_dev); |
335 | } | |
336 | ||
337 | /** | |
e26a5843 | 338 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
339 | * @device_name: Name of NTB client device |
340 | * | |
341 | * Unregister an NTB client device with the NTB transport layer | |
342 | */ | |
e26a5843 | 343 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
344 | { |
345 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 346 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
347 | |
348 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
349 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
350 | if (!strncmp(dev_name(&client->dev), device_name, | |
351 | strlen(device_name))) { | |
352 | list_del(&client->entry); | |
353 | device_unregister(&client->dev); | |
354 | } | |
355 | } | |
e26a5843 | 356 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
357 | |
358 | /** | |
e26a5843 | 359 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
360 | * @device_name: Name of NTB client device |
361 | * | |
362 | * Register an NTB client device with the NTB transport layer | |
363 | */ | |
e26a5843 | 364 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
365 | { |
366 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 367 | struct ntb_transport_ctx *nt; |
1199aa61 | 368 | int node; |
8b19d450 | 369 | int rc, i = 0; |
fce8a7bb | 370 | |
8222b402 JM |
371 | if (list_empty(&ntb_transport_list)) |
372 | return -ENODEV; | |
373 | ||
fce8a7bb JM |
374 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
375 | struct device *dev; | |
376 | ||
1199aa61 AH |
377 | node = dev_to_node(&nt->ndev->dev); |
378 | ||
379 | client_dev = kzalloc_node(sizeof(*client_dev), | |
380 | GFP_KERNEL, node); | |
fce8a7bb JM |
381 | if (!client_dev) { |
382 | rc = -ENOMEM; | |
383 | goto err; | |
384 | } | |
385 | ||
386 | dev = &client_dev->dev; | |
387 | ||
388 | /* setup and register client devices */ | |
8b19d450 | 389 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
390 | dev->bus = &ntb_transport_bus; |
391 | dev->release = ntb_transport_client_release; | |
392 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
393 | |
394 | rc = device_register(dev); | |
395 | if (rc) { | |
396 | kfree(client_dev); | |
397 | goto err; | |
398 | } | |
399 | ||
400 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 401 | i++; |
fce8a7bb JM |
402 | } |
403 | ||
404 | return 0; | |
405 | ||
406 | err: | |
e26a5843 | 407 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
408 | |
409 | return rc; | |
410 | } | |
e26a5843 | 411 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
412 | |
413 | /** | |
ec110bc7 | 414 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
415 | * @drv: NTB client driver to be registered |
416 | * | |
417 | * Register an NTB client driver with the NTB transport layer | |
418 | * | |
419 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
420 | */ | |
e26a5843 | 421 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 422 | { |
e26a5843 | 423 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 424 | |
8222b402 JM |
425 | if (list_empty(&ntb_transport_list)) |
426 | return -ENODEV; | |
427 | ||
fce8a7bb JM |
428 | return driver_register(&drv->driver); |
429 | } | |
ec110bc7 | 430 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
431 | |
432 | /** | |
ec110bc7 | 433 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
434 | * @drv: NTB client driver to be unregistered |
435 | * | |
436 | * Unregister an NTB client driver with the NTB transport layer | |
437 | * | |
438 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
439 | */ | |
e26a5843 | 440 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
441 | { |
442 | driver_unregister(&drv->driver); | |
443 | } | |
ec110bc7 | 444 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 445 | |
fce8a7bb JM |
446 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
447 | loff_t *offp) | |
448 | { | |
449 | struct ntb_transport_qp *qp; | |
d7237e22 | 450 | char *buf; |
fce8a7bb JM |
451 | ssize_t ret, out_offset, out_count; |
452 | ||
260bee94 DJ |
453 | qp = filp->private_data; |
454 | ||
455 | if (!qp || !qp->link_is_up) | |
456 | return 0; | |
457 | ||
282a2fee | 458 | out_count = 1000; |
d7237e22 JM |
459 | |
460 | buf = kmalloc(out_count, GFP_KERNEL); | |
461 | if (!buf) | |
462 | return -ENOMEM; | |
fce8a7bb | 463 | |
fce8a7bb JM |
464 | out_offset = 0; |
465 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 466 | "\nNTB QP stats:\n\n"); |
fce8a7bb JM |
467 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
468 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
469 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
470 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
471 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
472 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
473 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
474 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
475 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
476 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
477 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
478 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
479 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
480 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
481 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
482 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
483 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e | 484 | "rx_buff - \t0x%p\n", qp->rx_buff); |
fce8a7bb | 485 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 486 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 487 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
a754a8fc DJ |
488 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
489 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
490 | "rx_alloc_entry - \t%u\n\n", qp->rx_alloc_entry); | |
fce8a7bb JM |
491 | |
492 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
493 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
494 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
495 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
496 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
497 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
498 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
499 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
500 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
501 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
502 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
503 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 504 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 505 | "tx_mw - \t0x%p\n", qp->tx_mw); |
fce8a7bb | 506 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 507 | "tx_index (H) - \t%u\n", qp->tx_index); |
fce8a7bb | 508 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 509 | "RRI (T) - \t%u\n", |
e74bfeed | 510 | qp->remote_rx_info->entry); |
d98ef99e DJ |
511 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
512 | "tx_max_entry - \t%u\n", qp->tx_max_entry); | |
e74bfeed DJ |
513 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
514 | "free tx - \t%u\n", | |
515 | ntb_transport_tx_free_entry(qp)); | |
fce8a7bb JM |
516 | |
517 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d98ef99e DJ |
518 | "\n"); |
519 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
569410ca DJ |
520 | "Using TX DMA - \t%s\n", |
521 | qp->tx_dma_chan ? "Yes" : "No"); | |
522 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
523 | "Using RX DMA - \t%s\n", | |
524 | qp->rx_dma_chan ? "Yes" : "No"); | |
d98ef99e DJ |
525 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
526 | "QP Link - \t%s\n", | |
e26a5843 | 527 | qp->link_is_up ? "Up" : "Down"); |
d98ef99e DJ |
528 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
529 | "\n"); | |
530 | ||
d7237e22 JM |
531 | if (out_offset > out_count) |
532 | out_offset = out_count; | |
fce8a7bb JM |
533 | |
534 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 535 | kfree(buf); |
fce8a7bb JM |
536 | return ret; |
537 | } | |
538 | ||
539 | static const struct file_operations ntb_qp_debugfs_stats = { | |
540 | .owner = THIS_MODULE, | |
d66d7ac2 | 541 | .open = simple_open, |
fce8a7bb JM |
542 | .read = debugfs_read, |
543 | }; | |
544 | ||
545 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
546 | struct list_head *list) | |
547 | { | |
548 | unsigned long flags; | |
549 | ||
550 | spin_lock_irqsave(lock, flags); | |
551 | list_add_tail(entry, list); | |
552 | spin_unlock_irqrestore(lock, flags); | |
553 | } | |
554 | ||
555 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 556 | struct list_head *list) |
fce8a7bb JM |
557 | { |
558 | struct ntb_queue_entry *entry; | |
559 | unsigned long flags; | |
560 | ||
561 | spin_lock_irqsave(lock, flags); | |
562 | if (list_empty(list)) { | |
563 | entry = NULL; | |
564 | goto out; | |
565 | } | |
566 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
567 | list_del(&entry->entry); | |
e74bfeed | 568 | |
fce8a7bb JM |
569 | out: |
570 | spin_unlock_irqrestore(lock, flags); | |
571 | ||
572 | return entry; | |
573 | } | |
574 | ||
da2e5ae5 AH |
575 | static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock, |
576 | struct list_head *list, | |
577 | struct list_head *to_list) | |
578 | { | |
579 | struct ntb_queue_entry *entry; | |
580 | unsigned long flags; | |
581 | ||
582 | spin_lock_irqsave(lock, flags); | |
583 | ||
584 | if (list_empty(list)) { | |
585 | entry = NULL; | |
586 | } else { | |
587 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
588 | list_move_tail(&entry->entry, to_list); | |
589 | } | |
590 | ||
591 | spin_unlock_irqrestore(lock, flags); | |
592 | ||
593 | return entry; | |
594 | } | |
595 | ||
e26a5843 AH |
596 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
597 | unsigned int qp_num) | |
fce8a7bb | 598 | { |
e26a5843 AH |
599 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
600 | struct ntb_transport_mw *mw; | |
a754a8fc DJ |
601 | struct ntb_dev *ndev = nt->ndev; |
602 | struct ntb_queue_entry *entry; | |
ef114ed5 | 603 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 604 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 605 | unsigned int i; |
a754a8fc | 606 | int node; |
fce8a7bb | 607 | |
e26a5843 AH |
608 | mw_count = nt->mw_count; |
609 | qp_count = nt->qp_count; | |
948d3a65 | 610 | |
e26a5843 AH |
611 | mw_num = QP_TO_MW(nt, qp_num); |
612 | mw = &nt->mw_vec[mw_num]; | |
613 | ||
614 | if (!mw->virt_addr) | |
615 | return -ENOMEM; | |
fce8a7bb | 616 | |
8e8496e0 | 617 | if (mw_num < qp_count % mw_count) |
e26a5843 | 618 | num_qps_mw = qp_count / mw_count + 1; |
fce8a7bb | 619 | else |
e26a5843 | 620 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 621 | |
e26a5843 | 622 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
c92ba3c5 | 623 | qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); |
793c20e9 JM |
624 | rx_size -= sizeof(struct ntb_rx_info); |
625 | ||
282a2fee JM |
626 | qp->remote_rx_info = qp->rx_buff + rx_size; |
627 | ||
c9d534c8 JM |
628 | /* Due to housekeeping, there must be atleast 2 buffs */ |
629 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
630 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
631 | qp->rx_index = 0; | |
632 | ||
a754a8fc DJ |
633 | /* |
634 | * Checking to see if we have more entries than the default. | |
635 | * We should add additional entries if that is the case so we | |
636 | * can be in sync with the transport frames. | |
637 | */ | |
638 | node = dev_to_node(&ndev->dev); | |
639 | for (i = qp->rx_alloc_entry; i < qp->rx_max_entry; i++) { | |
640 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); | |
641 | if (!entry) | |
642 | return -ENOMEM; | |
643 | ||
644 | entry->qp = qp; | |
645 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, | |
646 | &qp->rx_free_q); | |
647 | qp->rx_alloc_entry++; | |
648 | } | |
649 | ||
c9d534c8 | 650 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 651 | |
ef114ed5 | 652 | /* setup the hdr offsets with 0's */ |
793c20e9 | 653 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
654 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
655 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 656 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 657 | } |
fce8a7bb JM |
658 | |
659 | qp->rx_pkts = 0; | |
660 | qp->tx_pkts = 0; | |
90f9e934 | 661 | qp->tx_index = 0; |
e26a5843 AH |
662 | |
663 | return 0; | |
fce8a7bb JM |
664 | } |
665 | ||
e26a5843 | 666 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 667 | { |
e26a5843 AH |
668 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
669 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
670 | |
671 | if (!mw->virt_addr) | |
672 | return; | |
673 | ||
443b9a14 | 674 | ntb_mw_clear_trans(nt->ndev, PIDX, num_mw); |
e26a5843 AH |
675 | dma_free_coherent(&pdev->dev, mw->buff_size, |
676 | mw->virt_addr, mw->dma_addr); | |
677 | mw->xlat_size = 0; | |
678 | mw->buff_size = 0; | |
b77b2637 JM |
679 | mw->virt_addr = NULL; |
680 | } | |
681 | ||
e26a5843 | 682 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
8c9edf63 | 683 | resource_size_t size) |
fce8a7bb | 684 | { |
e26a5843 AH |
685 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
686 | struct pci_dev *pdev = nt->ndev->pdev; | |
8c9edf63 | 687 | size_t xlat_size, buff_size; |
980c41c8 LG |
688 | resource_size_t xlat_align; |
689 | resource_size_t xlat_align_size; | |
e26a5843 AH |
690 | int rc; |
691 | ||
8c9edf63 AH |
692 | if (!size) |
693 | return -EINVAL; | |
694 | ||
980c41c8 LG |
695 | rc = ntb_mw_get_align(nt->ndev, PIDX, num_mw, &xlat_align, |
696 | &xlat_align_size, NULL); | |
697 | if (rc) | |
698 | return rc; | |
699 | ||
700 | xlat_size = round_up(size, xlat_align_size); | |
701 | buff_size = round_up(size, xlat_align); | |
fce8a7bb | 702 | |
b77b2637 | 703 | /* No need to re-setup */ |
e26a5843 | 704 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
705 | return 0; |
706 | ||
e26a5843 | 707 | if (mw->buff_size) |
b77b2637 JM |
708 | ntb_free_mw(nt, num_mw); |
709 | ||
e26a5843 AH |
710 | /* Alloc memory for receiving data. Must be aligned */ |
711 | mw->xlat_size = xlat_size; | |
712 | mw->buff_size = buff_size; | |
fce8a7bb | 713 | |
e26a5843 AH |
714 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
715 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 716 | if (!mw->virt_addr) { |
e26a5843 AH |
717 | mw->xlat_size = 0; |
718 | mw->buff_size = 0; | |
8c9edf63 | 719 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %zu\n", |
e26a5843 | 720 | buff_size); |
fce8a7bb JM |
721 | return -ENOMEM; |
722 | } | |
723 | ||
3cc5ba19 DJ |
724 | /* |
725 | * we must ensure that the memory address allocated is BAR size | |
726 | * aligned in order for the XLAT register to take the value. This | |
727 | * is a requirement of the hardware. It is recommended to setup CMA | |
728 | * for BAR sizes equal or greater than 4MB. | |
729 | */ | |
980c41c8 | 730 | if (!IS_ALIGNED(mw->dma_addr, xlat_align)) { |
e26a5843 | 731 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", |
3cc5ba19 DJ |
732 | &mw->dma_addr); |
733 | ntb_free_mw(nt, num_mw); | |
734 | return -ENOMEM; | |
735 | } | |
736 | ||
fce8a7bb | 737 | /* Notify HW the memory location of the receive buffer */ |
443b9a14 SS |
738 | rc = ntb_mw_set_trans(nt->ndev, PIDX, num_mw, mw->dma_addr, |
739 | mw->xlat_size); | |
e26a5843 AH |
740 | if (rc) { |
741 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
742 | ntb_free_mw(nt, num_mw); | |
743 | return -EIO; | |
744 | } | |
fce8a7bb JM |
745 | |
746 | return 0; | |
747 | } | |
748 | ||
2849b5d7 AH |
749 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
750 | { | |
751 | qp->link_is_up = false; | |
e9021331 | 752 | qp->active = false; |
2849b5d7 AH |
753 | |
754 | qp->tx_index = 0; | |
755 | qp->rx_index = 0; | |
756 | qp->rx_bytes = 0; | |
757 | qp->rx_pkts = 0; | |
758 | qp->rx_ring_empty = 0; | |
759 | qp->rx_err_no_buf = 0; | |
760 | qp->rx_err_oflow = 0; | |
761 | qp->rx_err_ver = 0; | |
762 | qp->rx_memcpy = 0; | |
763 | qp->rx_async = 0; | |
764 | qp->tx_bytes = 0; | |
765 | qp->tx_pkts = 0; | |
766 | qp->tx_ring_full = 0; | |
767 | qp->tx_err_no_buf = 0; | |
768 | qp->tx_memcpy = 0; | |
769 | qp->tx_async = 0; | |
770 | } | |
771 | ||
fca4d518 | 772 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 773 | { |
e26a5843 AH |
774 | struct ntb_transport_ctx *nt = qp->transport; |
775 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 776 | |
e22e0b9d | 777 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
778 | |
779 | cancel_delayed_work_sync(&qp->link_work); | |
780 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
781 | |
782 | if (qp->event_handler) | |
783 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
784 | } |
785 | ||
786 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
787 | { | |
788 | struct ntb_transport_qp *qp = container_of(work, | |
789 | struct ntb_transport_qp, | |
790 | link_cleanup); | |
e26a5843 | 791 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
792 | |
793 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 794 | |
e26a5843 | 795 | if (nt->link_is_up) |
fce8a7bb JM |
796 | schedule_delayed_work(&qp->link_work, |
797 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
798 | } | |
799 | ||
7b4f2d3c JM |
800 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
801 | { | |
802 | schedule_work(&qp->link_cleanup); | |
803 | } | |
804 | ||
e26a5843 | 805 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 806 | { |
e26a5843 AH |
807 | struct ntb_transport_qp *qp; |
808 | u64 qp_bitmap_alloc; | |
b17faba0 | 809 | unsigned int i, count; |
fce8a7bb | 810 | |
e26a5843 AH |
811 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
812 | ||
fca4d518 | 813 | /* Pass along the info to any clients */ |
e26a5843 AH |
814 | for (i = 0; i < nt->qp_count; i++) |
815 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
816 | qp = &nt->qp_vec[i]; | |
817 | ntb_qp_link_cleanup(qp); | |
818 | cancel_work_sync(&qp->link_cleanup); | |
819 | cancel_delayed_work_sync(&qp->link_work); | |
820 | } | |
fca4d518 | 821 | |
e26a5843 | 822 | if (!nt->link_is_up) |
fce8a7bb | 823 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 824 | |
fce8a7bb JM |
825 | /* The scratchpad registers keep the values if the remote side |
826 | * goes down, blast them now to give them a sane value the next | |
827 | * time they are accessed | |
828 | */ | |
b17faba0 SS |
829 | count = ntb_spad_count(nt->ndev); |
830 | for (i = 0; i < count; i++) | |
e26a5843 | 831 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
832 | } |
833 | ||
fca4d518 JM |
834 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
835 | { | |
e26a5843 AH |
836 | struct ntb_transport_ctx *nt = |
837 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
838 | |
839 | ntb_transport_link_cleanup(nt); | |
840 | } | |
841 | ||
e26a5843 | 842 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 843 | { |
e26a5843 | 844 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 845 | |
e26a5843 | 846 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 847 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 848 | else |
7b4f2d3c | 849 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
850 | } |
851 | ||
852 | static void ntb_transport_link_work(struct work_struct *work) | |
853 | { | |
e26a5843 AH |
854 | struct ntb_transport_ctx *nt = |
855 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
856 | struct ntb_dev *ndev = nt->ndev; | |
857 | struct pci_dev *pdev = ndev->pdev; | |
858 | resource_size_t size; | |
fce8a7bb | 859 | u32 val; |
84f76685 | 860 | int rc = 0, i, spad; |
fce8a7bb | 861 | |
113fc505 | 862 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
863 | for (i = 0; i < nt->mw_count; i++) { |
864 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 865 | |
e26a5843 AH |
866 | if (max_mw_size && size > max_mw_size) |
867 | size = max_mw_size; | |
fce8a7bb | 868 | |
e26a5843 | 869 | spad = MW0_SZ_HIGH + (i * 2); |
d67288a3 | 870 | ntb_peer_spad_write(ndev, PIDX, spad, upper_32_bits(size)); |
fce8a7bb | 871 | |
e26a5843 | 872 | spad = MW0_SZ_LOW + (i * 2); |
d67288a3 | 873 | ntb_peer_spad_write(ndev, PIDX, spad, lower_32_bits(size)); |
fce8a7bb JM |
874 | } |
875 | ||
d67288a3 | 876 | ntb_peer_spad_write(ndev, PIDX, NUM_MWS, nt->mw_count); |
fce8a7bb | 877 | |
d67288a3 | 878 | ntb_peer_spad_write(ndev, PIDX, NUM_QPS, nt->qp_count); |
fce8a7bb | 879 | |
d67288a3 | 880 | ntb_peer_spad_write(ndev, PIDX, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 881 | |
e26a5843 | 882 | /* Query the remote side for its info */ |
0f69a7df | 883 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
884 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
885 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 886 | goto out; |
fce8a7bb | 887 | |
0f69a7df | 888 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 889 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 890 | if (val != nt->qp_count) |
fce8a7bb | 891 | goto out; |
fce8a7bb | 892 | |
0f69a7df | 893 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 894 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
895 | if (val != nt->mw_count) |
896 | goto out; | |
fce8a7bb | 897 | |
e26a5843 | 898 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 899 | u64 val64; |
fce8a7bb | 900 | |
0f69a7df | 901 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 902 | val64 = (u64)val << 32; |
113fc505 | 903 | |
0f69a7df | 904 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
905 | val64 |= val; |
906 | ||
e26a5843 | 907 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
908 | |
909 | rc = ntb_set_mw(nt, i, val64); | |
910 | if (rc) | |
911 | goto out1; | |
912 | } | |
fce8a7bb | 913 | |
e26a5843 | 914 | nt->link_is_up = true; |
fce8a7bb | 915 | |
e26a5843 AH |
916 | for (i = 0; i < nt->qp_count; i++) { |
917 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
918 | |
919 | ntb_transport_setup_qp_mw(nt, i); | |
920 | ||
e26a5843 | 921 | if (qp->client_ready) |
fce8a7bb JM |
922 | schedule_delayed_work(&qp->link_work, 0); |
923 | } | |
924 | ||
925 | return; | |
926 | ||
113fc505 | 927 | out1: |
e26a5843 | 928 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 929 | ntb_free_mw(nt, i); |
84f76685 DJ |
930 | |
931 | /* if there's an actual failure, we should just bail */ | |
f3fd2afe | 932 | if (rc < 0) |
84f76685 | 933 | return; |
84f76685 | 934 | |
fce8a7bb | 935 | out: |
e26a5843 | 936 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
937 | schedule_delayed_work(&nt->link_work, |
938 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
939 | } | |
940 | ||
941 | static void ntb_qp_link_work(struct work_struct *work) | |
942 | { | |
943 | struct ntb_transport_qp *qp = container_of(work, | |
944 | struct ntb_transport_qp, | |
945 | link_work.work); | |
e26a5843 AH |
946 | struct pci_dev *pdev = qp->ndev->pdev; |
947 | struct ntb_transport_ctx *nt = qp->transport; | |
948 | int val; | |
fce8a7bb | 949 | |
e26a5843 | 950 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 951 | |
e26a5843 | 952 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 953 | |
d67288a3 | 954 | ntb_peer_spad_write(nt->ndev, PIDX, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
955 | |
956 | /* query remote spad for qp ready bits */ | |
28762289 | 957 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
958 | |
959 | /* See if the remote side is up */ | |
e26a5843 | 960 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 961 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 | 962 | qp->link_is_up = true; |
e9021331 | 963 | qp->active = true; |
e26a5843 | 964 | |
fce8a7bb | 965 | if (qp->event_handler) |
e26a5843 | 966 | qp->event_handler(qp->cb_data, qp->link_is_up); |
8b5a22d8 | 967 | |
e9021331 DJ |
968 | if (qp->active) |
969 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 970 | } else if (nt->link_is_up) |
fce8a7bb JM |
971 | schedule_delayed_work(&qp->link_work, |
972 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
973 | } | |
974 | ||
e26a5843 | 975 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 976 | unsigned int qp_num) |
fce8a7bb JM |
977 | { |
978 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
979 | phys_addr_t mw_base; |
980 | resource_size_t mw_size; | |
ef114ed5 | 981 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 982 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 983 | u64 qp_offset; |
948d3a65 | 984 | |
e26a5843 AH |
985 | mw_count = nt->mw_count; |
986 | qp_count = nt->qp_count; | |
fce8a7bb | 987 | |
e26a5843 | 988 | mw_num = QP_TO_MW(nt, qp_num); |
e26a5843 AH |
989 | |
990 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
991 | qp->qp_num = qp_num; |
992 | qp->transport = nt; | |
993 | qp->ndev = nt->ndev; | |
e26a5843 | 994 | qp->client_ready = false; |
fce8a7bb | 995 | qp->event_handler = NULL; |
2849b5d7 | 996 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 997 | |
8e8496e0 | 998 | if (mw_num < qp_count % mw_count) |
e26a5843 | 999 | num_qps_mw = qp_count / mw_count + 1; |
ef114ed5 | 1000 | else |
e26a5843 AH |
1001 | num_qps_mw = qp_count / mw_count; |
1002 | ||
1003 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
1004 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 1005 | |
0652d6f5 LG |
1006 | if (max_mw_size && mw_size > max_mw_size) |
1007 | mw_size = max_mw_size; | |
1008 | ||
e26a5843 | 1009 | tx_size = (unsigned int)mw_size / num_qps_mw; |
c92ba3c5 | 1010 | qp_offset = tx_size * (qp_num / mw_count); |
e26a5843 AH |
1011 | |
1012 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
1013 | if (!qp->tx_mw) |
1014 | return -EINVAL; | |
1015 | ||
e26a5843 | 1016 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
1017 | if (!qp->tx_mw_phys) |
1018 | return -EINVAL; | |
1019 | ||
793c20e9 | 1020 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 1021 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 1022 | |
c9d534c8 JM |
1023 | /* Due to housekeeping, there must be atleast 2 buffs */ |
1024 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 1025 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 1026 | |
c8650fd0 | 1027 | if (nt->debugfs_node_dir) { |
fce8a7bb JM |
1028 | char debugfs_name[4]; |
1029 | ||
1030 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
1031 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
c8650fd0 | 1032 | nt->debugfs_node_dir); |
fce8a7bb JM |
1033 | |
1034 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
1035 | qp->debugfs_dir, qp, | |
1036 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
1037 | } else { |
1038 | qp->debugfs_dir = NULL; | |
1039 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
1040 | } |
1041 | ||
1042 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 1043 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb | 1044 | |
da2e5ae5 | 1045 | spin_lock_init(&qp->ntb_rx_q_lock); |
fce8a7bb JM |
1046 | spin_lock_init(&qp->ntb_tx_free_q_lock); |
1047 | ||
da2e5ae5 | 1048 | INIT_LIST_HEAD(&qp->rx_post_q); |
fce8a7bb JM |
1049 | INIT_LIST_HEAD(&qp->rx_pend_q); |
1050 | INIT_LIST_HEAD(&qp->rx_free_q); | |
1051 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 1052 | |
e26a5843 AH |
1053 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
1054 | (unsigned long)qp); | |
1055 | ||
282a2fee | 1056 | return 0; |
fce8a7bb JM |
1057 | } |
1058 | ||
e26a5843 | 1059 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1060 | { |
e26a5843 AH |
1061 | struct ntb_transport_ctx *nt; |
1062 | struct ntb_transport_mw *mw; | |
b17faba0 | 1063 | unsigned int mw_count, qp_count, spad_count, max_mw_count_for_spads; |
e26a5843 | 1064 | u64 qp_bitmap; |
1199aa61 | 1065 | int node; |
fce8a7bb JM |
1066 | int rc, i; |
1067 | ||
bc240eec | 1068 | mw_count = ntb_peer_mw_count(ndev); |
443b9a14 SS |
1069 | |
1070 | if (!ndev->ops->mw_set_trans) { | |
1071 | dev_err(&ndev->dev, "Inbound MW based NTB API is required\n"); | |
1072 | return -EINVAL; | |
1073 | } | |
19645a07 | 1074 | |
e26a5843 AH |
1075 | if (ntb_db_is_unsafe(ndev)) |
1076 | dev_dbg(&ndev->dev, | |
1077 | "doorbell is unsafe, proceed anyway...\n"); | |
1078 | if (ntb_spad_is_unsafe(ndev)) | |
1079 | dev_dbg(&ndev->dev, | |
1080 | "scratchpad is unsafe, proceed anyway...\n"); | |
1081 | ||
1e530119 SS |
1082 | if (ntb_peer_port_count(ndev) != NTB_DEF_PEER_CNT) |
1083 | dev_warn(&ndev->dev, "Multi-port NTB devices unsupported\n"); | |
1084 | ||
1199aa61 AH |
1085 | node = dev_to_node(&ndev->dev); |
1086 | ||
1087 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
1088 | if (!nt) |
1089 | return -ENOMEM; | |
1090 | ||
e26a5843 | 1091 | nt->ndev = ndev; |
b17faba0 SS |
1092 | spad_count = ntb_spad_count(ndev); |
1093 | ||
1094 | /* Limit the MW's based on the availability of scratchpads */ | |
1095 | ||
1096 | if (spad_count < NTB_TRANSPORT_MIN_SPADS) { | |
1097 | nt->mw_count = 0; | |
1098 | rc = -EINVAL; | |
1099 | goto err; | |
1100 | } | |
e26a5843 | 1101 | |
b17faba0 SS |
1102 | max_mw_count_for_spads = (spad_count - MW0_SZ_HIGH) / 2; |
1103 | nt->mw_count = min(mw_count, max_mw_count_for_spads); | |
e26a5843 | 1104 | |
1199aa61 AH |
1105 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
1106 | GFP_KERNEL, node); | |
e26a5843 AH |
1107 | if (!nt->mw_vec) { |
1108 | rc = -ENOMEM; | |
fce8a7bb JM |
1109 | goto err; |
1110 | } | |
1111 | ||
e26a5843 AH |
1112 | for (i = 0; i < mw_count; i++) { |
1113 | mw = &nt->mw_vec[i]; | |
1114 | ||
443b9a14 SS |
1115 | rc = ntb_peer_mw_get_addr(ndev, i, &mw->phys_addr, |
1116 | &mw->phys_size); | |
e26a5843 AH |
1117 | if (rc) |
1118 | goto err1; | |
1119 | ||
06917f75 | 1120 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
1121 | if (!mw->vbase) { |
1122 | rc = -ENOMEM; | |
1123 | goto err1; | |
1124 | } | |
1125 | ||
1126 | mw->buff_size = 0; | |
1127 | mw->xlat_size = 0; | |
1128 | mw->virt_addr = NULL; | |
1129 | mw->dma_addr = 0; | |
948d3a65 JM |
1130 | } |
1131 | ||
e26a5843 AH |
1132 | qp_bitmap = ntb_db_valid_mask(ndev); |
1133 | ||
1134 | qp_count = ilog2(qp_bitmap); | |
1135 | if (max_num_clients && max_num_clients < qp_count) | |
1136 | qp_count = max_num_clients; | |
cb827ee6 LG |
1137 | else if (nt->mw_count < qp_count) |
1138 | qp_count = nt->mw_count; | |
e26a5843 AH |
1139 | |
1140 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1141 | ||
1142 | nt->qp_count = qp_count; | |
1143 | nt->qp_bitmap = qp_bitmap; | |
1144 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1145 | |
1199aa61 AH |
1146 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1147 | GFP_KERNEL, node); | |
e26a5843 | 1148 | if (!nt->qp_vec) { |
fce8a7bb | 1149 | rc = -ENOMEM; |
d4adee09 | 1150 | goto err1; |
fce8a7bb JM |
1151 | } |
1152 | ||
c8650fd0 DJ |
1153 | if (nt_debugfs_dir) { |
1154 | nt->debugfs_node_dir = | |
1155 | debugfs_create_dir(pci_name(ndev->pdev), | |
1156 | nt_debugfs_dir); | |
1157 | } | |
1158 | ||
e26a5843 | 1159 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1160 | rc = ntb_transport_init_queue(nt, i); |
1161 | if (rc) | |
d4adee09 | 1162 | goto err2; |
282a2fee | 1163 | } |
fce8a7bb JM |
1164 | |
1165 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1166 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1167 | |
e26a5843 | 1168 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1169 | if (rc) |
d4adee09 | 1170 | goto err2; |
fce8a7bb JM |
1171 | |
1172 | INIT_LIST_HEAD(&nt->client_devs); | |
1173 | rc = ntb_bus_init(nt); | |
1174 | if (rc) | |
d4adee09 | 1175 | goto err3; |
fce8a7bb | 1176 | |
e26a5843 AH |
1177 | nt->link_is_up = false; |
1178 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1179 | ntb_link_event(ndev); | |
fce8a7bb JM |
1180 | |
1181 | return 0; | |
1182 | ||
948d3a65 | 1183 | err3: |
d4adee09 | 1184 | ntb_clear_ctx(ndev); |
948d3a65 | 1185 | err2: |
d4adee09 | 1186 | kfree(nt->qp_vec); |
fce8a7bb | 1187 | err1: |
e26a5843 AH |
1188 | while (i--) { |
1189 | mw = &nt->mw_vec[i]; | |
1190 | iounmap(mw->vbase); | |
1191 | } | |
d4adee09 | 1192 | kfree(nt->mw_vec); |
fce8a7bb | 1193 | err: |
fce8a7bb JM |
1194 | kfree(nt); |
1195 | return rc; | |
1196 | } | |
1197 | ||
e26a5843 | 1198 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1199 | { |
e26a5843 AH |
1200 | struct ntb_transport_ctx *nt = ndev->ctx; |
1201 | struct ntb_transport_qp *qp; | |
1202 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1203 | int i; |
1204 | ||
fca4d518 | 1205 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1206 | cancel_work_sync(&nt->link_cleanup); |
1207 | cancel_delayed_work_sync(&nt->link_work); | |
1208 | ||
1209 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1210 | |
1211 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1212 | for (i = 0; i < nt->qp_count; i++) { |
1213 | qp = &nt->qp_vec[i]; | |
1214 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1215 | ntb_transport_free_queue(qp); | |
1216 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1217 | } |
fce8a7bb | 1218 | |
e26a5843 AH |
1219 | ntb_link_disable(ndev); |
1220 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1221 | |
e26a5843 | 1222 | ntb_bus_remove(nt); |
fce8a7bb | 1223 | |
e26a5843 | 1224 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1225 | ntb_free_mw(nt, i); |
e26a5843 AH |
1226 | iounmap(nt->mw_vec[i].vbase); |
1227 | } | |
fce8a7bb | 1228 | |
e26a5843 AH |
1229 | kfree(nt->qp_vec); |
1230 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1231 | kfree(nt); |
1232 | } | |
1233 | ||
da2e5ae5 | 1234 | static void ntb_complete_rxc(struct ntb_transport_qp *qp) |
fce8a7bb | 1235 | { |
da2e5ae5 AH |
1236 | struct ntb_queue_entry *entry; |
1237 | void *cb_data; | |
1238 | unsigned int len; | |
1239 | unsigned long irqflags; | |
1240 | ||
1241 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1242 | ||
1243 | while (!list_empty(&qp->rx_post_q)) { | |
1244 | entry = list_first_entry(&qp->rx_post_q, | |
1245 | struct ntb_queue_entry, entry); | |
1246 | if (!(entry->flags & DESC_DONE_FLAG)) | |
1247 | break; | |
1248 | ||
1249 | entry->rx_hdr->flags = 0; | |
72203572 | 1250 | iowrite32(entry->rx_index, &qp->rx_info->entry); |
da2e5ae5 AH |
1251 | |
1252 | cb_data = entry->cb_data; | |
1253 | len = entry->len; | |
1254 | ||
1255 | list_move_tail(&entry->entry, &qp->rx_free_q); | |
1256 | ||
1257 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); | |
1258 | ||
1259 | if (qp->rx_handler && qp->client_ready) | |
1260 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
1261 | ||
1262 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1263 | } | |
282a2fee | 1264 | |
da2e5ae5 AH |
1265 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
1266 | } | |
fce8a7bb | 1267 | |
72203572 DJ |
1268 | static void ntb_rx_copy_callback(void *data, |
1269 | const struct dmaengine_result *res) | |
da2e5ae5 AH |
1270 | { |
1271 | struct ntb_queue_entry *entry = data; | |
fce8a7bb | 1272 | |
72203572 DJ |
1273 | /* we need to check DMA results if we are using DMA */ |
1274 | if (res) { | |
1275 | enum dmaengine_tx_result dma_err = res->result; | |
1276 | ||
1277 | switch (dma_err) { | |
1278 | case DMA_TRANS_READ_FAILED: | |
1279 | case DMA_TRANS_WRITE_FAILED: | |
1280 | entry->errors++; | |
1281 | case DMA_TRANS_ABORTED: | |
1282 | { | |
1283 | struct ntb_transport_qp *qp = entry->qp; | |
1284 | void *offset = qp->rx_buff + qp->rx_max_frame * | |
1285 | qp->rx_index; | |
1286 | ||
1287 | ntb_memcpy_rx(entry, offset); | |
1288 | qp->rx_memcpy++; | |
1289 | return; | |
1290 | } | |
1291 | ||
1292 | case DMA_TRANS_NOERROR: | |
1293 | default: | |
1294 | break; | |
1295 | } | |
1296 | } | |
1297 | ||
da2e5ae5 | 1298 | entry->flags |= DESC_DONE_FLAG; |
448c6fb3 | 1299 | |
da2e5ae5 | 1300 | ntb_complete_rxc(entry->qp); |
fce8a7bb JM |
1301 | } |
1302 | ||
282a2fee JM |
1303 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1304 | { | |
1305 | void *buf = entry->buf; | |
1306 | size_t len = entry->len; | |
1307 | ||
1308 | memcpy(buf, offset, len); | |
1309 | ||
e26a5843 AH |
1310 | /* Ensure that the data is fully copied out before clearing the flag */ |
1311 | wmb(); | |
1312 | ||
72203572 | 1313 | ntb_rx_copy_callback(entry, NULL); |
282a2fee JM |
1314 | } |
1315 | ||
72203572 | 1316 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset) |
282a2fee JM |
1317 | { |
1318 | struct dma_async_tx_descriptor *txd; | |
1319 | struct ntb_transport_qp *qp = entry->qp; | |
569410ca | 1320 | struct dma_chan *chan = qp->rx_dma_chan; |
282a2fee | 1321 | struct dma_device *device; |
da2e5ae5 | 1322 | size_t pay_off, buff_off, len; |
6f57fd05 | 1323 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1324 | dma_cookie_t cookie; |
1325 | void *buf = entry->buf; | |
282a2fee | 1326 | |
da2e5ae5 | 1327 | len = entry->len; |
282a2fee | 1328 | device = chan->device; |
e26a5843 AH |
1329 | pay_off = (size_t)offset & ~PAGE_MASK; |
1330 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1331 | |
1332 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
905921e7 | 1333 | goto err; |
282a2fee | 1334 | |
6f57fd05 BZ |
1335 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1336 | if (!unmap) | |
905921e7 | 1337 | goto err; |
282a2fee | 1338 | |
6f57fd05 BZ |
1339 | unmap->len = len; |
1340 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1341 | pay_off, len, DMA_TO_DEVICE); | |
1342 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1343 | goto err_get_unmap; | |
1344 | ||
1345 | unmap->to_cnt = 1; | |
282a2fee | 1346 | |
6f57fd05 BZ |
1347 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1348 | buff_off, len, DMA_FROM_DEVICE); | |
1349 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1350 | goto err_get_unmap; | |
1351 | ||
1352 | unmap->from_cnt = 1; | |
1353 | ||
88931ec3 AH |
1354 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
1355 | unmap->addr[0], len, | |
1356 | DMA_PREP_INTERRUPT); | |
1357 | if (!txd) | |
6f57fd05 | 1358 | goto err_get_unmap; |
282a2fee | 1359 | |
72203572 | 1360 | txd->callback_result = ntb_rx_copy_callback; |
282a2fee | 1361 | txd->callback_param = entry; |
6f57fd05 | 1362 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1363 | |
1364 | cookie = dmaengine_submit(txd); | |
1365 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1366 | goto err_set_unmap; |
1367 | ||
1368 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1369 | |
1370 | qp->last_cookie = cookie; | |
1371 | ||
1372 | qp->rx_async++; | |
1373 | ||
72203572 | 1374 | return 0; |
282a2fee | 1375 | |
6f57fd05 BZ |
1376 | err_set_unmap: |
1377 | dmaengine_unmap_put(unmap); | |
1378 | err_get_unmap: | |
1379 | dmaengine_unmap_put(unmap); | |
72203572 DJ |
1380 | err: |
1381 | return -ENXIO; | |
1382 | } | |
1383 | ||
1384 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) | |
1385 | { | |
1386 | struct ntb_transport_qp *qp = entry->qp; | |
1387 | struct dma_chan *chan = qp->rx_dma_chan; | |
1388 | int res; | |
1389 | ||
1390 | if (!chan) | |
1391 | goto err; | |
1392 | ||
1393 | if (entry->len < copy_bytes) | |
1394 | goto err; | |
1395 | ||
1396 | res = ntb_async_rx_submit(entry, offset); | |
1397 | if (res < 0) | |
1398 | goto err; | |
1399 | ||
1400 | if (!entry->retries) | |
1401 | qp->rx_async++; | |
1402 | ||
1403 | return; | |
1404 | ||
282a2fee JM |
1405 | err: |
1406 | ntb_memcpy_rx(entry, offset); | |
1407 | qp->rx_memcpy++; | |
1408 | } | |
1409 | ||
fce8a7bb JM |
1410 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1411 | { | |
1412 | struct ntb_payload_header *hdr; | |
1413 | struct ntb_queue_entry *entry; | |
1414 | void *offset; | |
1415 | ||
793c20e9 JM |
1416 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1417 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1418 | ||
e26a5843 AH |
1419 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1420 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1421 | |
fce8a7bb | 1422 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1423 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1424 | qp->rx_ring_empty++; |
1425 | return -EAGAIN; | |
1426 | } | |
1427 | ||
e26a5843 AH |
1428 | if (hdr->flags & LINK_DOWN_FLAG) { |
1429 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1430 | ntb_qp_link_down(qp); | |
1431 | hdr->flags = 0; | |
c0900b33 | 1432 | return -EAGAIN; |
e26a5843 AH |
1433 | } |
1434 | ||
1435 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1436 | dev_dbg(&qp->ndev->pdev->dev, | |
1437 | "version mismatch, expected %llu - got %u\n", | |
1438 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1439 | qp->rx_err_ver++; |
1440 | return -EIO; | |
1441 | } | |
1442 | ||
da2e5ae5 | 1443 | entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); |
e26a5843 AH |
1444 | if (!entry) { |
1445 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1446 | qp->rx_err_no_buf++; | |
da2e5ae5 | 1447 | return -EAGAIN; |
fce8a7bb JM |
1448 | } |
1449 | ||
da2e5ae5 | 1450 | entry->rx_hdr = hdr; |
72203572 | 1451 | entry->rx_index = qp->rx_index; |
da2e5ae5 | 1452 | |
282a2fee | 1453 | if (hdr->len > entry->len) { |
e26a5843 AH |
1454 | dev_dbg(&qp->ndev->pdev->dev, |
1455 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1456 | hdr->len, entry->len); |
e26a5843 | 1457 | qp->rx_err_oflow++; |
282a2fee | 1458 | |
da2e5ae5 AH |
1459 | entry->len = -EIO; |
1460 | entry->flags |= DESC_DONE_FLAG; | |
fce8a7bb | 1461 | |
da2e5ae5 AH |
1462 | ntb_complete_rxc(qp); |
1463 | } else { | |
1464 | dev_dbg(&qp->ndev->pdev->dev, | |
1465 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1466 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
e26a5843 | 1467 | |
da2e5ae5 AH |
1468 | qp->rx_bytes += hdr->len; |
1469 | qp->rx_pkts++; | |
e26a5843 | 1470 | |
da2e5ae5 | 1471 | entry->len = hdr->len; |
282a2fee | 1472 | |
da2e5ae5 AH |
1473 | ntb_async_rx(entry, offset); |
1474 | } | |
fce8a7bb | 1475 | |
282a2fee JM |
1476 | qp->rx_index++; |
1477 | qp->rx_index %= qp->rx_max_entry; | |
1478 | ||
1479 | return 0; | |
fce8a7bb JM |
1480 | } |
1481 | ||
e26a5843 | 1482 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1483 | { |
e26a5843 | 1484 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1485 | int rc, i; |
fce8a7bb | 1486 | |
e26a5843 AH |
1487 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1488 | __func__, qp->qp_num); | |
e8aeb60c | 1489 | |
c336acd3 JM |
1490 | /* Limit the number of packets processed in a single interrupt to |
1491 | * provide fairness to others | |
1492 | */ | |
1493 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1494 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1495 | if (rc) |
1496 | break; | |
1497 | } | |
282a2fee | 1498 | |
569410ca DJ |
1499 | if (i && qp->rx_dma_chan) |
1500 | dma_async_issue_pending(qp->rx_dma_chan); | |
fce8a7bb | 1501 | |
e26a5843 AH |
1502 | if (i == qp->rx_max_entry) { |
1503 | /* there is more work to do */ | |
e9021331 DJ |
1504 | if (qp->active) |
1505 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
1506 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { |
1507 | /* the doorbell bit is set: clear it */ | |
1508 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1509 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1510 | ntb_db_read(qp->ndev); | |
1511 | ||
1512 | /* an interrupt may have arrived between finishing | |
1513 | * ntb_process_rxc and clearing the doorbell bit: | |
1514 | * there might be some more work to do. | |
1515 | */ | |
e9021331 DJ |
1516 | if (qp->active) |
1517 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 1518 | } |
fce8a7bb JM |
1519 | } |
1520 | ||
9cabc269 DJ |
1521 | static void ntb_tx_copy_callback(void *data, |
1522 | const struct dmaengine_result *res) | |
fce8a7bb | 1523 | { |
282a2fee JM |
1524 | struct ntb_queue_entry *entry = data; |
1525 | struct ntb_transport_qp *qp = entry->qp; | |
1526 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1527 | |
9cabc269 DJ |
1528 | /* we need to check DMA results if we are using DMA */ |
1529 | if (res) { | |
1530 | enum dmaengine_tx_result dma_err = res->result; | |
1531 | ||
1532 | switch (dma_err) { | |
1533 | case DMA_TRANS_READ_FAILED: | |
1534 | case DMA_TRANS_WRITE_FAILED: | |
1535 | entry->errors++; | |
1536 | case DMA_TRANS_ABORTED: | |
1537 | { | |
1538 | void __iomem *offset = | |
1539 | qp->tx_mw + qp->tx_max_frame * | |
1540 | entry->tx_index; | |
1541 | ||
1542 | /* resubmit via CPU */ | |
1543 | ntb_memcpy_tx(entry, offset); | |
1544 | qp->tx_memcpy++; | |
1545 | return; | |
1546 | } | |
1547 | ||
1548 | case DMA_TRANS_NOERROR: | |
1549 | default: | |
1550 | break; | |
1551 | } | |
1552 | } | |
1553 | ||
74465645 | 1554 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1555 | |
e26a5843 | 1556 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1557 | |
1558 | /* The entry length can only be zero if the packet is intended to be a | |
1559 | * "link down" or similar. Since no payload is being sent in these | |
1560 | * cases, there is nothing to add to the completion queue. | |
1561 | */ | |
1562 | if (entry->len > 0) { | |
1563 | qp->tx_bytes += entry->len; | |
1564 | ||
1565 | if (qp->tx_handler) | |
1566 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1567 | entry->len); | |
1568 | } | |
1569 | ||
1570 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1571 | } | |
1572 | ||
282a2fee | 1573 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1574 | { |
06917f75 DJ |
1575 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1576 | /* | |
1577 | * Using non-temporal mov to improve performance on non-cached | |
1578 | * writes, even though we aren't actually copying from user space. | |
1579 | */ | |
1580 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1581 | #else | |
282a2fee | 1582 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1583 | #endif |
282a2fee | 1584 | |
e26a5843 AH |
1585 | /* Ensure that the data is fully copied out before setting the flags */ |
1586 | wmb(); | |
1587 | ||
9cabc269 | 1588 | ntb_tx_copy_callback(entry, NULL); |
282a2fee JM |
1589 | } |
1590 | ||
9cabc269 DJ |
1591 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
1592 | struct ntb_queue_entry *entry) | |
282a2fee | 1593 | { |
282a2fee | 1594 | struct dma_async_tx_descriptor *txd; |
569410ca | 1595 | struct dma_chan *chan = qp->tx_dma_chan; |
282a2fee | 1596 | struct dma_device *device; |
9cabc269 DJ |
1597 | size_t len = entry->len; |
1598 | void *buf = entry->buf; | |
282a2fee | 1599 | size_t dest_off, buff_off; |
6f57fd05 BZ |
1600 | struct dmaengine_unmap_data *unmap; |
1601 | dma_addr_t dest; | |
282a2fee | 1602 | dma_cookie_t cookie; |
fce8a7bb | 1603 | |
282a2fee | 1604 | device = chan->device; |
9cabc269 | 1605 | dest = qp->tx_mw_phys + qp->tx_max_frame * entry->tx_index; |
e26a5843 AH |
1606 | buff_off = (size_t)buf & ~PAGE_MASK; |
1607 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1608 | |
1609 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1610 | goto err; | |
1611 | ||
6f57fd05 BZ |
1612 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1613 | if (!unmap) | |
282a2fee JM |
1614 | goto err; |
1615 | ||
6f57fd05 BZ |
1616 | unmap->len = len; |
1617 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1618 | buff_off, len, DMA_TO_DEVICE); | |
1619 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1620 | goto err_get_unmap; | |
1621 | ||
1622 | unmap->to_cnt = 1; | |
1623 | ||
88931ec3 AH |
1624 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
1625 | DMA_PREP_INTERRUPT); | |
1626 | if (!txd) | |
6f57fd05 | 1627 | goto err_get_unmap; |
282a2fee | 1628 | |
9cabc269 | 1629 | txd->callback_result = ntb_tx_copy_callback; |
282a2fee | 1630 | txd->callback_param = entry; |
6f57fd05 | 1631 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1632 | |
1633 | cookie = dmaengine_submit(txd); | |
1634 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1635 | goto err_set_unmap; |
1636 | ||
1637 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1638 | |
1639 | dma_async_issue_pending(chan); | |
282a2fee | 1640 | |
9cabc269 | 1641 | return 0; |
6f57fd05 BZ |
1642 | err_set_unmap: |
1643 | dmaengine_unmap_put(unmap); | |
1644 | err_get_unmap: | |
1645 | dmaengine_unmap_put(unmap); | |
9cabc269 DJ |
1646 | err: |
1647 | return -ENXIO; | |
1648 | } | |
1649 | ||
1650 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1651 | struct ntb_queue_entry *entry) | |
1652 | { | |
1653 | struct ntb_payload_header __iomem *hdr; | |
1654 | struct dma_chan *chan = qp->tx_dma_chan; | |
1655 | void __iomem *offset; | |
1656 | int res; | |
1657 | ||
1658 | entry->tx_index = qp->tx_index; | |
1659 | offset = qp->tx_mw + qp->tx_max_frame * entry->tx_index; | |
1660 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1661 | entry->tx_hdr = hdr; | |
1662 | ||
1663 | iowrite32(entry->len, &hdr->len); | |
1664 | iowrite32((u32)qp->tx_pkts, &hdr->ver); | |
1665 | ||
1666 | if (!chan) | |
1667 | goto err; | |
1668 | ||
1669 | if (entry->len < copy_bytes) | |
1670 | goto err; | |
1671 | ||
1672 | res = ntb_async_tx_submit(qp, entry); | |
1673 | if (res < 0) | |
1674 | goto err; | |
1675 | ||
1676 | if (!entry->retries) | |
1677 | qp->tx_async++; | |
1678 | ||
1679 | return; | |
1680 | ||
282a2fee JM |
1681 | err: |
1682 | ntb_memcpy_tx(entry, offset); | |
1683 | qp->tx_memcpy++; | |
1684 | } | |
1685 | ||
1686 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1687 | struct ntb_queue_entry *entry) | |
1688 | { | |
793c20e9 | 1689 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1690 | qp->tx_ring_full++; |
1691 | return -EAGAIN; | |
1692 | } | |
1693 | ||
ef114ed5 | 1694 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb | 1695 | if (qp->tx_handler) |
179f912a | 1696 | qp->tx_handler(qp, qp->cb_data, NULL, -EIO); |
fce8a7bb JM |
1697 | |
1698 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1699 | &qp->tx_free_q); | |
1700 | return 0; | |
1701 | } | |
1702 | ||
282a2fee | 1703 | ntb_async_tx(qp, entry); |
fce8a7bb | 1704 | |
793c20e9 JM |
1705 | qp->tx_index++; |
1706 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1707 | |
1708 | qp->tx_pkts++; | |
1709 | ||
1710 | return 0; | |
1711 | } | |
1712 | ||
1713 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1714 | { | |
e26a5843 | 1715 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1716 | struct ntb_queue_entry *entry; |
1717 | int i, rc; | |
1718 | ||
e26a5843 | 1719 | if (!qp->link_is_up) |
fce8a7bb JM |
1720 | return; |
1721 | ||
e22e0b9d | 1722 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1723 | |
1724 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1725 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1726 | if (entry) |
1727 | break; | |
1728 | msleep(100); | |
1729 | } | |
1730 | ||
1731 | if (!entry) | |
1732 | return; | |
1733 | ||
1734 | entry->cb_data = NULL; | |
1735 | entry->buf = NULL; | |
1736 | entry->len = 0; | |
1737 | entry->flags = LINK_DOWN_FLAG; | |
1738 | ||
1739 | rc = ntb_process_tx(qp, entry); | |
1740 | if (rc) | |
1741 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1742 | qp->qp_num); | |
2849b5d7 AH |
1743 | |
1744 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1745 | } |
1746 | ||
1199aa61 AH |
1747 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1748 | { | |
1749 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1750 | } | |
1751 | ||
fce8a7bb JM |
1752 | /** |
1753 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1754 | * @rx_handler: receive callback function | |
1755 | * @tx_handler: transmit callback function | |
1756 | * @event_handler: event callback function | |
1757 | * | |
1758 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1759 | * routine for both transmit and receive. The receive callback routine will be | |
1760 | * used to pass up data when the transport has received it on the queue. The | |
1761 | * transmit callback routine will be called when the transport has completed the | |
1762 | * transmission of the data on the queue and the data is ready to be freed. | |
1763 | * | |
1764 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1765 | */ | |
1766 | struct ntb_transport_qp * | |
e26a5843 | 1767 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1768 | const struct ntb_queue_handlers *handlers) |
1769 | { | |
e26a5843 AH |
1770 | struct ntb_dev *ndev; |
1771 | struct pci_dev *pdev; | |
1772 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1773 | struct ntb_queue_entry *entry; |
1774 | struct ntb_transport_qp *qp; | |
e26a5843 | 1775 | u64 qp_bit; |
fce8a7bb | 1776 | unsigned int free_queue; |
1199aa61 AH |
1777 | dma_cap_mask_t dma_mask; |
1778 | int node; | |
e26a5843 | 1779 | int i; |
fce8a7bb | 1780 | |
e26a5843 AH |
1781 | ndev = dev_ntb(client_dev->parent); |
1782 | pdev = ndev->pdev; | |
1783 | nt = ndev->ctx; | |
fce8a7bb | 1784 | |
1199aa61 AH |
1785 | node = dev_to_node(&ndev->dev); |
1786 | ||
8fcd0950 | 1787 | free_queue = ffs(nt->qp_bitmap_free); |
fce8a7bb JM |
1788 | if (!free_queue) |
1789 | goto err; | |
1790 | ||
1791 | /* decrement free_queue to make it zero based */ | |
1792 | free_queue--; | |
1793 | ||
e26a5843 AH |
1794 | qp = &nt->qp_vec[free_queue]; |
1795 | qp_bit = BIT_ULL(qp->qp_num); | |
1796 | ||
1797 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1798 | |
fce8a7bb JM |
1799 | qp->cb_data = data; |
1800 | qp->rx_handler = handlers->rx_handler; | |
1801 | qp->tx_handler = handlers->tx_handler; | |
1802 | qp->event_handler = handlers->event_handler; | |
1803 | ||
1199aa61 AH |
1804 | dma_cap_zero(dma_mask); |
1805 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1806 | ||
a41ef053 | 1807 | if (use_dma) { |
569410ca DJ |
1808 | qp->tx_dma_chan = |
1809 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1810 | (void *)(unsigned long)node); | |
1811 | if (!qp->tx_dma_chan) | |
1812 | dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n"); | |
1813 | ||
1814 | qp->rx_dma_chan = | |
1815 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1816 | (void *)(unsigned long)node); | |
1817 | if (!qp->rx_dma_chan) | |
1818 | dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n"); | |
a41ef053 | 1819 | } else { |
569410ca DJ |
1820 | qp->tx_dma_chan = NULL; |
1821 | qp->rx_dma_chan = NULL; | |
a41ef053 | 1822 | } |
569410ca DJ |
1823 | |
1824 | dev_dbg(&pdev->dev, "Using %s memcpy for TX\n", | |
1825 | qp->tx_dma_chan ? "DMA" : "CPU"); | |
1826 | ||
1827 | dev_dbg(&pdev->dev, "Using %s memcpy for RX\n", | |
1828 | qp->rx_dma_chan ? "DMA" : "CPU"); | |
282a2fee | 1829 | |
fce8a7bb | 1830 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1831 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1832 | if (!entry) |
1833 | goto err1; | |
1834 | ||
282a2fee | 1835 | entry->qp = qp; |
da2e5ae5 | 1836 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
f766755c | 1837 | &qp->rx_free_q); |
fce8a7bb | 1838 | } |
a754a8fc | 1839 | qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; |
fce8a7bb | 1840 | |
a754a8fc | 1841 | for (i = 0; i < qp->tx_max_entry; i++) { |
1199aa61 | 1842 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1843 | if (!entry) |
1844 | goto err2; | |
1845 | ||
282a2fee | 1846 | entry->qp = qp; |
fce8a7bb | 1847 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1848 | &qp->tx_free_q); |
fce8a7bb JM |
1849 | } |
1850 | ||
e26a5843 AH |
1851 | ntb_db_clear(qp->ndev, qp_bit); |
1852 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1853 | |
1854 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1855 | ||
1856 | return qp; | |
1857 | ||
fce8a7bb | 1858 | err2: |
f766755c | 1859 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1860 | kfree(entry); |
1861 | err1: | |
a754a8fc | 1862 | qp->rx_alloc_entry = 0; |
da2e5ae5 | 1863 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1864 | kfree(entry); |
569410ca DJ |
1865 | if (qp->tx_dma_chan) |
1866 | dma_release_channel(qp->tx_dma_chan); | |
1867 | if (qp->rx_dma_chan) | |
1868 | dma_release_channel(qp->rx_dma_chan); | |
e26a5843 | 1869 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1870 | err: |
1871 | return NULL; | |
1872 | } | |
1873 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1874 | ||
1875 | /** | |
1876 | * ntb_transport_free_queue - Frees NTB transport queue | |
1877 | * @qp: NTB queue to be freed | |
1878 | * | |
1879 | * Frees NTB transport queue | |
1880 | */ | |
1881 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1882 | { | |
186f27ff | 1883 | struct pci_dev *pdev; |
fce8a7bb | 1884 | struct ntb_queue_entry *entry; |
e26a5843 | 1885 | u64 qp_bit; |
fce8a7bb JM |
1886 | |
1887 | if (!qp) | |
1888 | return; | |
1889 | ||
e26a5843 | 1890 | pdev = qp->ndev->pdev; |
186f27ff | 1891 | |
e9021331 DJ |
1892 | qp->active = false; |
1893 | ||
569410ca DJ |
1894 | if (qp->tx_dma_chan) { |
1895 | struct dma_chan *chan = qp->tx_dma_chan; | |
1896 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1897 | * processed by the CPU instead of the DAM engine | |
1898 | */ | |
1899 | qp->tx_dma_chan = NULL; | |
1900 | ||
1901 | /* Try to be nice and wait for any queued DMA engine | |
1902 | * transactions to process before smashing it with a rock | |
1903 | */ | |
1904 | dma_sync_wait(chan, qp->last_cookie); | |
1905 | dmaengine_terminate_all(chan); | |
1906 | dma_release_channel(chan); | |
1907 | } | |
1908 | ||
1909 | if (qp->rx_dma_chan) { | |
1910 | struct dma_chan *chan = qp->rx_dma_chan; | |
282a2fee JM |
1911 | /* Putting the dma_chan to NULL will force any new traffic to be |
1912 | * processed by the CPU instead of the DAM engine | |
1913 | */ | |
569410ca | 1914 | qp->rx_dma_chan = NULL; |
282a2fee JM |
1915 | |
1916 | /* Try to be nice and wait for any queued DMA engine | |
1917 | * transactions to process before smashing it with a rock | |
1918 | */ | |
1919 | dma_sync_wait(chan, qp->last_cookie); | |
1920 | dmaengine_terminate_all(chan); | |
1199aa61 | 1921 | dma_release_channel(chan); |
282a2fee | 1922 | } |
fce8a7bb | 1923 | |
e26a5843 AH |
1924 | qp_bit = BIT_ULL(qp->qp_num); |
1925 | ||
1926 | ntb_db_set_mask(qp->ndev, qp_bit); | |
e9021331 | 1927 | tasklet_kill(&qp->rxc_db_work); |
fce8a7bb | 1928 | |
282a2fee JM |
1929 | cancel_delayed_work_sync(&qp->link_work); |
1930 | ||
e26a5843 AH |
1931 | qp->cb_data = NULL; |
1932 | qp->rx_handler = NULL; | |
1933 | qp->tx_handler = NULL; | |
1934 | qp->event_handler = NULL; | |
1935 | ||
da2e5ae5 | 1936 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1937 | kfree(entry); |
1938 | ||
da2e5ae5 AH |
1939 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) { |
1940 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n"); | |
1941 | kfree(entry); | |
1942 | } | |
1943 | ||
1944 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) { | |
1945 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n"); | |
fce8a7bb JM |
1946 | kfree(entry); |
1947 | } | |
1948 | ||
f766755c | 1949 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1950 | kfree(entry); |
1951 | ||
30a4bb1e | 1952 | qp->transport->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1953 | |
1954 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1955 | } | |
1956 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1957 | ||
1958 | /** | |
1959 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1960 | * @qp: NTB queue to be freed | |
1961 | * @len: pointer to variable to write enqueued buffers length | |
1962 | * | |
1963 | * Dequeues unused buffers from receive queue. Should only be used during | |
1964 | * shutdown of qp. | |
1965 | * | |
1966 | * RETURNS: NULL error value on error, or void* for success. | |
1967 | */ | |
1968 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1969 | { | |
1970 | struct ntb_queue_entry *entry; | |
1971 | void *buf; | |
1972 | ||
e26a5843 | 1973 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1974 | return NULL; |
1975 | ||
da2e5ae5 | 1976 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q); |
fce8a7bb JM |
1977 | if (!entry) |
1978 | return NULL; | |
1979 | ||
1980 | buf = entry->cb_data; | |
1981 | *len = entry->len; | |
1982 | ||
da2e5ae5 | 1983 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1984 | |
1985 | return buf; | |
1986 | } | |
1987 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1988 | ||
1989 | /** | |
1990 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1991 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1992 | * @cb: per buffer pointer for callback function to use | |
1993 | * @data: pointer to data buffer that incoming packets will be copied into | |
1994 | * @len: length of the data buffer | |
1995 | * | |
1996 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1997 | * payload can be received into. | |
1998 | * | |
1999 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2000 | */ | |
2001 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
2002 | unsigned int len) | |
2003 | { | |
2004 | struct ntb_queue_entry *entry; | |
2005 | ||
2006 | if (!qp) | |
2007 | return -EINVAL; | |
2008 | ||
da2e5ae5 | 2009 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q); |
fce8a7bb JM |
2010 | if (!entry) |
2011 | return -ENOMEM; | |
2012 | ||
2013 | entry->cb_data = cb; | |
2014 | entry->buf = data; | |
2015 | entry->len = len; | |
da2e5ae5 | 2016 | entry->flags = 0; |
72203572 DJ |
2017 | entry->retries = 0; |
2018 | entry->errors = 0; | |
2019 | entry->rx_index = 0; | |
da2e5ae5 AH |
2020 | |
2021 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q); | |
fce8a7bb | 2022 | |
e9021331 DJ |
2023 | if (qp->active) |
2024 | tasklet_schedule(&qp->rxc_db_work); | |
fce8a7bb JM |
2025 | |
2026 | return 0; | |
2027 | } | |
2028 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
2029 | ||
2030 | /** | |
2031 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
2032 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
2033 | * @cb: per buffer pointer for callback function to use | |
2034 | * @data: pointer to data buffer that will be sent | |
2035 | * @len: length of the data buffer | |
2036 | * | |
2037 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 2038 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
2039 | * serialize access to the qp. |
2040 | * | |
2041 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2042 | */ | |
2043 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
2044 | unsigned int len) | |
2045 | { | |
2046 | struct ntb_queue_entry *entry; | |
2047 | int rc; | |
2048 | ||
e26a5843 | 2049 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
2050 | return -EINVAL; |
2051 | ||
2052 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
2053 | if (!entry) { |
2054 | qp->tx_err_no_buf++; | |
e74bfeed | 2055 | return -EBUSY; |
282a2fee | 2056 | } |
fce8a7bb JM |
2057 | |
2058 | entry->cb_data = cb; | |
2059 | entry->buf = data; | |
2060 | entry->len = len; | |
2061 | entry->flags = 0; | |
9cabc269 DJ |
2062 | entry->errors = 0; |
2063 | entry->retries = 0; | |
2064 | entry->tx_index = 0; | |
fce8a7bb JM |
2065 | |
2066 | rc = ntb_process_tx(qp, entry); | |
2067 | if (rc) | |
2068 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
2069 | &qp->tx_free_q); | |
2070 | ||
2071 | return rc; | |
2072 | } | |
2073 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
2074 | ||
2075 | /** | |
2076 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
2077 | * @qp: NTB transport layer queue to be enabled | |
2078 | * | |
2079 | * Notify NTB transport layer of client readiness to use queue | |
2080 | */ | |
2081 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
2082 | { | |
2083 | if (!qp) | |
2084 | return; | |
2085 | ||
e26a5843 | 2086 | qp->client_ready = true; |
fce8a7bb | 2087 | |
e26a5843 | 2088 | if (qp->transport->link_is_up) |
fce8a7bb JM |
2089 | schedule_delayed_work(&qp->link_work, 0); |
2090 | } | |
2091 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
2092 | ||
2093 | /** | |
2094 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
2095 | * @qp: NTB transport layer queue to be disabled | |
2096 | * | |
2097 | * Notify NTB transport layer of client's desire to no longer receive data on | |
2098 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 2099 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
2100 | */ |
2101 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
2102 | { | |
e26a5843 | 2103 | int val; |
fce8a7bb JM |
2104 | |
2105 | if (!qp) | |
2106 | return; | |
2107 | ||
e26a5843 | 2108 | qp->client_ready = false; |
fce8a7bb | 2109 | |
e26a5843 | 2110 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 2111 | |
d67288a3 | 2112 | ntb_peer_spad_write(qp->ndev, PIDX, QP_LINKS, val & ~BIT(qp->qp_num)); |
fce8a7bb | 2113 | |
e26a5843 | 2114 | if (qp->link_is_up) |
fce8a7bb JM |
2115 | ntb_send_link_down(qp); |
2116 | else | |
2117 | cancel_delayed_work_sync(&qp->link_work); | |
2118 | } | |
2119 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
2120 | ||
2121 | /** | |
2122 | * ntb_transport_link_query - Query transport link state | |
2123 | * @qp: NTB transport layer queue to be queried | |
2124 | * | |
2125 | * Query connectivity to the remote system of the NTB transport queue | |
2126 | * | |
2127 | * RETURNS: true for link up or false for link down | |
2128 | */ | |
2129 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
2130 | { | |
186f27ff JM |
2131 | if (!qp) |
2132 | return false; | |
2133 | ||
e26a5843 | 2134 | return qp->link_is_up; |
fce8a7bb JM |
2135 | } |
2136 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
2137 | ||
2138 | /** | |
2139 | * ntb_transport_qp_num - Query the qp number | |
2140 | * @qp: NTB transport layer queue to be queried | |
2141 | * | |
2142 | * Query qp number of the NTB transport queue | |
2143 | * | |
2144 | * RETURNS: a zero based number specifying the qp number | |
2145 | */ | |
2146 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
2147 | { | |
186f27ff JM |
2148 | if (!qp) |
2149 | return 0; | |
2150 | ||
fce8a7bb JM |
2151 | return qp->qp_num; |
2152 | } | |
2153 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
2154 | ||
2155 | /** | |
2156 | * ntb_transport_max_size - Query the max payload size of a qp | |
2157 | * @qp: NTB transport layer queue to be queried | |
2158 | * | |
2159 | * Query the maximum payload size permissible on the given qp | |
2160 | * | |
2161 | * RETURNS: the max payload size of a qp | |
2162 | */ | |
ef114ed5 | 2163 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 2164 | { |
04afde45 | 2165 | unsigned int max_size; |
569410ca | 2166 | unsigned int copy_align; |
04afde45 | 2167 | struct dma_chan *rx_chan, *tx_chan; |
282a2fee | 2168 | |
186f27ff JM |
2169 | if (!qp) |
2170 | return 0; | |
2171 | ||
04afde45 DJ |
2172 | rx_chan = qp->rx_dma_chan; |
2173 | tx_chan = qp->tx_dma_chan; | |
282a2fee | 2174 | |
04afde45 DJ |
2175 | copy_align = max(rx_chan ? rx_chan->device->copy_align : 0, |
2176 | tx_chan ? tx_chan->device->copy_align : 0); | |
569410ca | 2177 | |
282a2fee | 2178 | /* If DMA engine usage is possible, try to find the max size for that */ |
04afde45 DJ |
2179 | max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header); |
2180 | max_size = round_down(max_size, 1 << copy_align); | |
282a2fee | 2181 | |
04afde45 | 2182 | return max_size; |
fce8a7bb JM |
2183 | } |
2184 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 | 2185 | |
e74bfeed DJ |
2186 | unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp) |
2187 | { | |
2188 | unsigned int head = qp->tx_index; | |
2189 | unsigned int tail = qp->remote_rx_info->entry; | |
2190 | ||
2191 | return tail > head ? tail - head : qp->tx_max_entry + tail - head; | |
2192 | } | |
2193 | EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry); | |
2194 | ||
e26a5843 AH |
2195 | static void ntb_transport_doorbell_callback(void *data, int vector) |
2196 | { | |
2197 | struct ntb_transport_ctx *nt = data; | |
2198 | struct ntb_transport_qp *qp; | |
2199 | u64 db_bits; | |
2200 | unsigned int qp_num; | |
2201 | ||
2202 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
2203 | ntb_db_vector_mask(nt->ndev, vector)); | |
2204 | ||
2205 | while (db_bits) { | |
2206 | qp_num = __ffs(db_bits); | |
2207 | qp = &nt->qp_vec[qp_num]; | |
2208 | ||
e9021331 DJ |
2209 | if (qp->active) |
2210 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
2211 | |
2212 | db_bits &= ~BIT_ULL(qp_num); | |
2213 | } | |
2214 | } | |
2215 | ||
2216 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
2217 | .link_event = ntb_transport_event_callback, | |
2218 | .db_event = ntb_transport_doorbell_callback, | |
2219 | }; | |
2220 | ||
2221 | static struct ntb_client ntb_transport_client = { | |
2222 | .ops = { | |
2223 | .probe = ntb_transport_probe, | |
2224 | .remove = ntb_transport_free, | |
2225 | }, | |
2226 | }; | |
2227 | ||
2228 | static int __init ntb_transport_init(void) | |
2229 | { | |
2230 | int rc; | |
2231 | ||
7eb38781 DJ |
2232 | pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
2233 | ||
e26a5843 AH |
2234 | if (debugfs_initialized()) |
2235 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
2236 | ||
2237 | rc = bus_register(&ntb_transport_bus); | |
2238 | if (rc) | |
2239 | goto err_bus; | |
2240 | ||
2241 | rc = ntb_register_client(&ntb_transport_client); | |
2242 | if (rc) | |
2243 | goto err_client; | |
2244 | ||
2245 | return 0; | |
2246 | ||
2247 | err_client: | |
2248 | bus_unregister(&ntb_transport_bus); | |
2249 | err_bus: | |
2250 | debugfs_remove_recursive(nt_debugfs_dir); | |
2251 | return rc; | |
2252 | } | |
2253 | module_init(ntb_transport_init); | |
2254 | ||
2255 | static void __exit ntb_transport_exit(void) | |
2256 | { | |
e26a5843 AH |
2257 | ntb_unregister_client(&ntb_transport_client); |
2258 | bus_unregister(&ntb_transport_bus); | |
dd62245e | 2259 | debugfs_remove_recursive(nt_debugfs_dir); |
e26a5843 AH |
2260 | } |
2261 | module_exit(ntb_transport_exit); |