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 | ||
2b0569b3 LG |
96 | static bool use_msi; |
97 | #ifdef CONFIG_NTB_MSI | |
98 | module_param(use_msi, bool, 0644); | |
99 | MODULE_PARM_DESC(use_msi, "Use MSI interrupts instead of doorbells"); | |
100 | #endif | |
101 | ||
e26a5843 AH |
102 | static struct dentry *nt_debugfs_dir; |
103 | ||
1e530119 SS |
104 | /* Only two-ports NTB devices are supported */ |
105 | #define PIDX NTB_DEF_PEER_IDX | |
106 | ||
fce8a7bb JM |
107 | struct ntb_queue_entry { |
108 | /* ntb_queue list reference */ | |
109 | struct list_head entry; | |
e26a5843 | 110 | /* pointers to data to be transferred */ |
fce8a7bb JM |
111 | void *cb_data; |
112 | void *buf; | |
113 | unsigned int len; | |
114 | unsigned int flags; | |
9cabc269 DJ |
115 | int retries; |
116 | int errors; | |
117 | unsigned int tx_index; | |
72203572 | 118 | unsigned int rx_index; |
282a2fee JM |
119 | |
120 | struct ntb_transport_qp *qp; | |
121 | union { | |
122 | struct ntb_payload_header __iomem *tx_hdr; | |
123 | struct ntb_payload_header *rx_hdr; | |
124 | }; | |
fce8a7bb JM |
125 | }; |
126 | ||
793c20e9 JM |
127 | struct ntb_rx_info { |
128 | unsigned int entry; | |
129 | }; | |
130 | ||
fce8a7bb | 131 | struct ntb_transport_qp { |
e26a5843 AH |
132 | struct ntb_transport_ctx *transport; |
133 | struct ntb_dev *ndev; | |
fce8a7bb | 134 | void *cb_data; |
569410ca DJ |
135 | struct dma_chan *tx_dma_chan; |
136 | struct dma_chan *rx_dma_chan; | |
fce8a7bb JM |
137 | |
138 | bool client_ready; | |
e26a5843 | 139 | bool link_is_up; |
e9021331 | 140 | bool active; |
e26a5843 | 141 | |
fce8a7bb | 142 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 143 | u64 qp_bit; |
fce8a7bb | 144 | |
74465645 | 145 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
146 | struct ntb_rx_info *remote_rx_info; |
147 | ||
53ca4fea JM |
148 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
149 | void *data, int len); | |
fce8a7bb JM |
150 | struct list_head tx_free_q; |
151 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 152 | void __iomem *tx_mw; |
c59666bb LG |
153 | phys_addr_t tx_mw_phys; |
154 | size_t tx_mw_size; | |
155 | dma_addr_t tx_mw_dma_addr; | |
793c20e9 JM |
156 | unsigned int tx_index; |
157 | unsigned int tx_max_entry; | |
ef114ed5 | 158 | unsigned int tx_max_frame; |
fce8a7bb | 159 | |
53ca4fea JM |
160 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
161 | void *data, int len); | |
da2e5ae5 | 162 | struct list_head rx_post_q; |
fce8a7bb JM |
163 | struct list_head rx_pend_q; |
164 | struct list_head rx_free_q; | |
da2e5ae5 AH |
165 | /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */ |
166 | spinlock_t ntb_rx_q_lock; | |
793c20e9 JM |
167 | void *rx_buff; |
168 | unsigned int rx_index; | |
169 | unsigned int rx_max_entry; | |
ef114ed5 | 170 | unsigned int rx_max_frame; |
a754a8fc | 171 | unsigned int rx_alloc_entry; |
282a2fee | 172 | dma_cookie_t last_cookie; |
e26a5843 | 173 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 174 | |
53ca4fea | 175 | void (*event_handler)(void *data, int status); |
fce8a7bb | 176 | struct delayed_work link_work; |
7b4f2d3c | 177 | struct work_struct link_cleanup; |
fce8a7bb JM |
178 | |
179 | struct dentry *debugfs_dir; | |
180 | struct dentry *debugfs_stats; | |
181 | ||
182 | /* Stats */ | |
183 | u64 rx_bytes; | |
184 | u64 rx_pkts; | |
185 | u64 rx_ring_empty; | |
186 | u64 rx_err_no_buf; | |
187 | u64 rx_err_oflow; | |
188 | u64 rx_err_ver; | |
282a2fee JM |
189 | u64 rx_memcpy; |
190 | u64 rx_async; | |
fce8a7bb JM |
191 | u64 tx_bytes; |
192 | u64 tx_pkts; | |
193 | u64 tx_ring_full; | |
282a2fee JM |
194 | u64 tx_err_no_buf; |
195 | u64 tx_memcpy; | |
196 | u64 tx_async; | |
2b0569b3 LG |
197 | |
198 | bool use_msi; | |
199 | int msi_irq; | |
200 | struct ntb_msi_desc msi_desc; | |
201 | struct ntb_msi_desc peer_msi_desc; | |
fce8a7bb JM |
202 | }; |
203 | ||
204 | struct ntb_transport_mw { | |
e26a5843 AH |
205 | phys_addr_t phys_addr; |
206 | resource_size_t phys_size; | |
e26a5843 AH |
207 | void __iomem *vbase; |
208 | size_t xlat_size; | |
209 | size_t buff_size; | |
fc5d1829 AS |
210 | size_t alloc_size; |
211 | void *alloc_addr; | |
fce8a7bb JM |
212 | void *virt_addr; |
213 | dma_addr_t dma_addr; | |
214 | }; | |
215 | ||
216 | struct ntb_transport_client_dev { | |
217 | struct list_head entry; | |
e26a5843 | 218 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
219 | struct device dev; |
220 | }; | |
221 | ||
e26a5843 | 222 | struct ntb_transport_ctx { |
fce8a7bb JM |
223 | struct list_head entry; |
224 | struct list_head client_devs; | |
225 | ||
e26a5843 AH |
226 | struct ntb_dev *ndev; |
227 | ||
228 | struct ntb_transport_mw *mw_vec; | |
229 | struct ntb_transport_qp *qp_vec; | |
230 | unsigned int mw_count; | |
231 | unsigned int qp_count; | |
232 | u64 qp_bitmap; | |
233 | u64 qp_bitmap_free; | |
234 | ||
2b0569b3 LG |
235 | bool use_msi; |
236 | unsigned int msi_spad_offset; | |
237 | u64 msi_db_mask; | |
238 | ||
e26a5843 | 239 | bool link_is_up; |
fce8a7bb | 240 | struct delayed_work link_work; |
7b4f2d3c | 241 | struct work_struct link_cleanup; |
c8650fd0 DJ |
242 | |
243 | struct dentry *debugfs_node_dir; | |
fce8a7bb JM |
244 | }; |
245 | ||
246 | enum { | |
e26a5843 AH |
247 | DESC_DONE_FLAG = BIT(0), |
248 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
249 | }; |
250 | ||
251 | struct ntb_payload_header { | |
74465645 | 252 | unsigned int ver; |
fce8a7bb JM |
253 | unsigned int len; |
254 | unsigned int flags; | |
255 | }; | |
256 | ||
257 | enum { | |
258 | VERSION = 0, | |
fce8a7bb | 259 | QP_LINKS, |
113fc505 JM |
260 | NUM_QPS, |
261 | NUM_MWS, | |
262 | MW0_SZ_HIGH, | |
263 | MW0_SZ_LOW, | |
fce8a7bb JM |
264 | }; |
265 | ||
e26a5843 AH |
266 | #define dev_client_dev(__dev) \ |
267 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
268 | ||
269 | #define drv_client(__drv) \ | |
270 | container_of((__drv), struct ntb_transport_client, driver) | |
271 | ||
272 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
273 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
274 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
275 | ||
e26a5843 AH |
276 | static void ntb_transport_rxc_db(unsigned long data); |
277 | static const struct ntb_ctx_ops ntb_transport_ops; | |
278 | static struct ntb_client ntb_transport_client; | |
9cabc269 DJ |
279 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
280 | struct ntb_queue_entry *entry); | |
281 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset); | |
72203572 DJ |
282 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset); |
283 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset); | |
284 | ||
e26a5843 AH |
285 | |
286 | static int ntb_transport_bus_match(struct device *dev, | |
287 | struct device_driver *drv) | |
fce8a7bb JM |
288 | { |
289 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
290 | } | |
291 | ||
e26a5843 | 292 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 293 | { |
e26a5843 | 294 | const struct ntb_transport_client *client; |
5e2cbf13 | 295 | int rc; |
fce8a7bb JM |
296 | |
297 | get_device(dev); | |
e26a5843 AH |
298 | |
299 | client = drv_client(dev->driver); | |
300 | rc = client->probe(dev); | |
fce8a7bb JM |
301 | if (rc) |
302 | put_device(dev); | |
303 | ||
304 | return rc; | |
305 | } | |
306 | ||
fc7a6209 | 307 | static void ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 308 | { |
e26a5843 | 309 | const struct ntb_transport_client *client; |
fce8a7bb | 310 | |
e26a5843 AH |
311 | client = drv_client(dev->driver); |
312 | client->remove(dev); | |
fce8a7bb JM |
313 | |
314 | put_device(dev); | |
fce8a7bb JM |
315 | } |
316 | ||
e26a5843 AH |
317 | static struct bus_type ntb_transport_bus = { |
318 | .name = "ntb_transport", | |
319 | .match = ntb_transport_bus_match, | |
320 | .probe = ntb_transport_bus_probe, | |
321 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
322 | }; |
323 | ||
324 | static LIST_HEAD(ntb_transport_list); | |
325 | ||
e26a5843 | 326 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 327 | { |
31510000 | 328 | list_add_tail(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
329 | return 0; |
330 | } | |
331 | ||
e26a5843 | 332 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
333 | { |
334 | struct ntb_transport_client_dev *client_dev, *cd; | |
335 | ||
336 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
337 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
338 | dev_name(&client_dev->dev)); | |
339 | list_del(&client_dev->entry); | |
340 | device_unregister(&client_dev->dev); | |
341 | } | |
342 | ||
343 | list_del(&nt->entry); | |
fce8a7bb JM |
344 | } |
345 | ||
e26a5843 | 346 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
347 | { |
348 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 349 | |
e26a5843 | 350 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
351 | kfree(client_dev); |
352 | } | |
353 | ||
354 | /** | |
e26a5843 | 355 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
356 | * @device_name: Name of NTB client device |
357 | * | |
358 | * Unregister an NTB client device with the NTB transport layer | |
359 | */ | |
e26a5843 | 360 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
361 | { |
362 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 363 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
364 | |
365 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
366 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
367 | if (!strncmp(dev_name(&client->dev), device_name, | |
368 | strlen(device_name))) { | |
369 | list_del(&client->entry); | |
370 | device_unregister(&client->dev); | |
371 | } | |
372 | } | |
e26a5843 | 373 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
374 | |
375 | /** | |
e26a5843 | 376 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
377 | * @device_name: Name of NTB client device |
378 | * | |
379 | * Register an NTB client device with the NTB transport layer | |
380 | */ | |
e26a5843 | 381 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
382 | { |
383 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 384 | struct ntb_transport_ctx *nt; |
1199aa61 | 385 | int node; |
8b19d450 | 386 | int rc, i = 0; |
fce8a7bb | 387 | |
8222b402 JM |
388 | if (list_empty(&ntb_transport_list)) |
389 | return -ENODEV; | |
390 | ||
fce8a7bb JM |
391 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
392 | struct device *dev; | |
393 | ||
1199aa61 AH |
394 | node = dev_to_node(&nt->ndev->dev); |
395 | ||
396 | client_dev = kzalloc_node(sizeof(*client_dev), | |
397 | GFP_KERNEL, node); | |
fce8a7bb JM |
398 | if (!client_dev) { |
399 | rc = -ENOMEM; | |
400 | goto err; | |
401 | } | |
402 | ||
403 | dev = &client_dev->dev; | |
404 | ||
405 | /* setup and register client devices */ | |
8b19d450 | 406 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
407 | dev->bus = &ntb_transport_bus; |
408 | dev->release = ntb_transport_client_release; | |
409 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
410 | |
411 | rc = device_register(dev); | |
412 | if (rc) { | |
413 | kfree(client_dev); | |
414 | goto err; | |
415 | } | |
416 | ||
417 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 418 | i++; |
fce8a7bb JM |
419 | } |
420 | ||
421 | return 0; | |
422 | ||
423 | err: | |
e26a5843 | 424 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
425 | |
426 | return rc; | |
427 | } | |
e26a5843 | 428 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
429 | |
430 | /** | |
ec110bc7 | 431 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
432 | * @drv: NTB client driver to be registered |
433 | * | |
434 | * Register an NTB client driver with the NTB transport layer | |
435 | * | |
436 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
437 | */ | |
e26a5843 | 438 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 439 | { |
e26a5843 | 440 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 441 | |
8222b402 JM |
442 | if (list_empty(&ntb_transport_list)) |
443 | return -ENODEV; | |
444 | ||
fce8a7bb JM |
445 | return driver_register(&drv->driver); |
446 | } | |
ec110bc7 | 447 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
448 | |
449 | /** | |
ec110bc7 | 450 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
451 | * @drv: NTB client driver to be unregistered |
452 | * | |
453 | * Unregister an NTB client driver with the NTB transport layer | |
454 | * | |
455 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
456 | */ | |
e26a5843 | 457 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
458 | { |
459 | driver_unregister(&drv->driver); | |
460 | } | |
ec110bc7 | 461 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 462 | |
fce8a7bb JM |
463 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
464 | loff_t *offp) | |
465 | { | |
466 | struct ntb_transport_qp *qp; | |
d7237e22 | 467 | char *buf; |
fce8a7bb JM |
468 | ssize_t ret, out_offset, out_count; |
469 | ||
260bee94 DJ |
470 | qp = filp->private_data; |
471 | ||
472 | if (!qp || !qp->link_is_up) | |
473 | return 0; | |
474 | ||
282a2fee | 475 | out_count = 1000; |
d7237e22 JM |
476 | |
477 | buf = kmalloc(out_count, GFP_KERNEL); | |
478 | if (!buf) | |
479 | return -ENOMEM; | |
fce8a7bb | 480 | |
fce8a7bb | 481 | out_offset = 0; |
7f78c68a | 482 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 483 | "\nNTB QP stats:\n\n"); |
7f78c68a | 484 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 485 | "rx_bytes - \t%llu\n", qp->rx_bytes); |
7f78c68a | 486 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 487 | "rx_pkts - \t%llu\n", qp->rx_pkts); |
7f78c68a | 488 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
282a2fee | 489 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); |
7f78c68a | 490 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
282a2fee | 491 | "rx_async - \t%llu\n", qp->rx_async); |
7f78c68a | 492 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 493 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); |
7f78c68a | 494 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 495 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); |
7f78c68a | 496 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 497 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); |
7f78c68a | 498 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 499 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); |
7f78c68a | 500 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 501 | "rx_buff - \t0x%p\n", qp->rx_buff); |
7f78c68a | 502 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 503 | "rx_index - \t%u\n", qp->rx_index); |
7f78c68a | 504 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
a754a8fc | 505 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
7f78c68a | 506 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
a754a8fc | 507 | "rx_alloc_entry - \t%u\n\n", qp->rx_alloc_entry); |
fce8a7bb | 508 | |
7f78c68a | 509 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 510 | "tx_bytes - \t%llu\n", qp->tx_bytes); |
7f78c68a | 511 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 512 | "tx_pkts - \t%llu\n", qp->tx_pkts); |
7f78c68a | 513 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
282a2fee | 514 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); |
7f78c68a | 515 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
282a2fee | 516 | "tx_async - \t%llu\n", qp->tx_async); |
7f78c68a | 517 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
fce8a7bb | 518 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); |
7f78c68a | 519 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
282a2fee | 520 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); |
7f78c68a | 521 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 522 | "tx_mw - \t0x%p\n", qp->tx_mw); |
7f78c68a | 523 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 524 | "tx_index (H) - \t%u\n", qp->tx_index); |
7f78c68a | 525 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 526 | "RRI (T) - \t%u\n", |
e74bfeed | 527 | qp->remote_rx_info->entry); |
7f78c68a | 528 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 529 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
7f78c68a | 530 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
e74bfeed DJ |
531 | "free tx - \t%u\n", |
532 | ntb_transport_tx_free_entry(qp)); | |
fce8a7bb | 533 | |
7f78c68a | 534 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 535 | "\n"); |
7f78c68a | 536 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
569410ca DJ |
537 | "Using TX DMA - \t%s\n", |
538 | qp->tx_dma_chan ? "Yes" : "No"); | |
7f78c68a | 539 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
569410ca DJ |
540 | "Using RX DMA - \t%s\n", |
541 | qp->rx_dma_chan ? "Yes" : "No"); | |
7f78c68a | 542 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e | 543 | "QP Link - \t%s\n", |
e26a5843 | 544 | qp->link_is_up ? "Up" : "Down"); |
7f78c68a | 545 | out_offset += scnprintf(buf + out_offset, out_count - out_offset, |
d98ef99e DJ |
546 | "\n"); |
547 | ||
d7237e22 JM |
548 | if (out_offset > out_count) |
549 | out_offset = out_count; | |
fce8a7bb JM |
550 | |
551 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 552 | kfree(buf); |
fce8a7bb JM |
553 | return ret; |
554 | } | |
555 | ||
556 | static const struct file_operations ntb_qp_debugfs_stats = { | |
557 | .owner = THIS_MODULE, | |
d66d7ac2 | 558 | .open = simple_open, |
fce8a7bb JM |
559 | .read = debugfs_read, |
560 | }; | |
561 | ||
562 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
563 | struct list_head *list) | |
564 | { | |
565 | unsigned long flags; | |
566 | ||
567 | spin_lock_irqsave(lock, flags); | |
568 | list_add_tail(entry, list); | |
569 | spin_unlock_irqrestore(lock, flags); | |
570 | } | |
571 | ||
572 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 573 | struct list_head *list) |
fce8a7bb JM |
574 | { |
575 | struct ntb_queue_entry *entry; | |
576 | unsigned long flags; | |
577 | ||
578 | spin_lock_irqsave(lock, flags); | |
579 | if (list_empty(list)) { | |
580 | entry = NULL; | |
581 | goto out; | |
582 | } | |
583 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
584 | list_del(&entry->entry); | |
e74bfeed | 585 | |
fce8a7bb JM |
586 | out: |
587 | spin_unlock_irqrestore(lock, flags); | |
588 | ||
589 | return entry; | |
590 | } | |
591 | ||
da2e5ae5 AH |
592 | static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock, |
593 | struct list_head *list, | |
594 | struct list_head *to_list) | |
595 | { | |
596 | struct ntb_queue_entry *entry; | |
597 | unsigned long flags; | |
598 | ||
599 | spin_lock_irqsave(lock, flags); | |
600 | ||
601 | if (list_empty(list)) { | |
602 | entry = NULL; | |
603 | } else { | |
604 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
605 | list_move_tail(&entry->entry, to_list); | |
606 | } | |
607 | ||
608 | spin_unlock_irqrestore(lock, flags); | |
609 | ||
610 | return entry; | |
611 | } | |
612 | ||
e26a5843 AH |
613 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
614 | unsigned int qp_num) | |
fce8a7bb | 615 | { |
e26a5843 AH |
616 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
617 | struct ntb_transport_mw *mw; | |
a754a8fc DJ |
618 | struct ntb_dev *ndev = nt->ndev; |
619 | struct ntb_queue_entry *entry; | |
ef114ed5 | 620 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 621 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 622 | unsigned int i; |
a754a8fc | 623 | int node; |
fce8a7bb | 624 | |
e26a5843 AH |
625 | mw_count = nt->mw_count; |
626 | qp_count = nt->qp_count; | |
948d3a65 | 627 | |
e26a5843 AH |
628 | mw_num = QP_TO_MW(nt, qp_num); |
629 | mw = &nt->mw_vec[mw_num]; | |
630 | ||
631 | if (!mw->virt_addr) | |
632 | return -ENOMEM; | |
fce8a7bb | 633 | |
8e8496e0 | 634 | if (mw_num < qp_count % mw_count) |
e26a5843 | 635 | num_qps_mw = qp_count / mw_count + 1; |
fce8a7bb | 636 | else |
e26a5843 | 637 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 638 | |
e26a5843 | 639 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
c92ba3c5 | 640 | qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); |
793c20e9 JM |
641 | rx_size -= sizeof(struct ntb_rx_info); |
642 | ||
282a2fee JM |
643 | qp->remote_rx_info = qp->rx_buff + rx_size; |
644 | ||
c9d534c8 JM |
645 | /* Due to housekeeping, there must be atleast 2 buffs */ |
646 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
647 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
648 | qp->rx_index = 0; | |
649 | ||
a754a8fc DJ |
650 | /* |
651 | * Checking to see if we have more entries than the default. | |
652 | * We should add additional entries if that is the case so we | |
653 | * can be in sync with the transport frames. | |
654 | */ | |
655 | node = dev_to_node(&ndev->dev); | |
656 | for (i = qp->rx_alloc_entry; i < qp->rx_max_entry; i++) { | |
82edcc75 | 657 | entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); |
a754a8fc DJ |
658 | if (!entry) |
659 | return -ENOMEM; | |
660 | ||
661 | entry->qp = qp; | |
662 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, | |
663 | &qp->rx_free_q); | |
664 | qp->rx_alloc_entry++; | |
665 | } | |
666 | ||
c9d534c8 | 667 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 668 | |
ef114ed5 | 669 | /* setup the hdr offsets with 0's */ |
793c20e9 | 670 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
671 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
672 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 673 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 674 | } |
fce8a7bb JM |
675 | |
676 | qp->rx_pkts = 0; | |
677 | qp->tx_pkts = 0; | |
90f9e934 | 678 | qp->tx_index = 0; |
e26a5843 AH |
679 | |
680 | return 0; | |
fce8a7bb JM |
681 | } |
682 | ||
2b0569b3 LG |
683 | static irqreturn_t ntb_transport_isr(int irq, void *dev) |
684 | { | |
685 | struct ntb_transport_qp *qp = dev; | |
686 | ||
687 | tasklet_schedule(&qp->rxc_db_work); | |
688 | ||
689 | return IRQ_HANDLED; | |
690 | } | |
691 | ||
692 | static void ntb_transport_setup_qp_peer_msi(struct ntb_transport_ctx *nt, | |
693 | unsigned int qp_num) | |
694 | { | |
695 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; | |
696 | int spad = qp_num * 2 + nt->msi_spad_offset; | |
697 | ||
698 | if (!nt->use_msi) | |
699 | return; | |
700 | ||
701 | if (spad >= ntb_spad_count(nt->ndev)) | |
702 | return; | |
703 | ||
704 | qp->peer_msi_desc.addr_offset = | |
705 | ntb_peer_spad_read(qp->ndev, PIDX, spad); | |
706 | qp->peer_msi_desc.data = | |
707 | ntb_peer_spad_read(qp->ndev, PIDX, spad + 1); | |
708 | ||
709 | dev_dbg(&qp->ndev->pdev->dev, "QP%d Peer MSI addr=%x data=%x\n", | |
710 | qp_num, qp->peer_msi_desc.addr_offset, qp->peer_msi_desc.data); | |
711 | ||
712 | if (qp->peer_msi_desc.addr_offset) { | |
713 | qp->use_msi = true; | |
714 | dev_info(&qp->ndev->pdev->dev, | |
715 | "Using MSI interrupts for QP%d\n", qp_num); | |
716 | } | |
717 | } | |
718 | ||
719 | static void ntb_transport_setup_qp_msi(struct ntb_transport_ctx *nt, | |
720 | unsigned int qp_num) | |
721 | { | |
722 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; | |
723 | int spad = qp_num * 2 + nt->msi_spad_offset; | |
724 | int rc; | |
725 | ||
726 | if (!nt->use_msi) | |
727 | return; | |
728 | ||
729 | if (spad >= ntb_spad_count(nt->ndev)) { | |
730 | dev_warn_once(&qp->ndev->pdev->dev, | |
731 | "Not enough SPADS to use MSI interrupts\n"); | |
732 | return; | |
733 | } | |
734 | ||
735 | ntb_spad_write(qp->ndev, spad, 0); | |
736 | ntb_spad_write(qp->ndev, spad + 1, 0); | |
737 | ||
738 | if (!qp->msi_irq) { | |
739 | qp->msi_irq = ntbm_msi_request_irq(qp->ndev, ntb_transport_isr, | |
740 | KBUILD_MODNAME, qp, | |
741 | &qp->msi_desc); | |
742 | if (qp->msi_irq < 0) { | |
743 | dev_warn(&qp->ndev->pdev->dev, | |
744 | "Unable to allocate MSI interrupt for qp%d\n", | |
745 | qp_num); | |
746 | return; | |
747 | } | |
748 | } | |
749 | ||
750 | rc = ntb_spad_write(qp->ndev, spad, qp->msi_desc.addr_offset); | |
751 | if (rc) | |
752 | goto err_free_interrupt; | |
753 | ||
754 | rc = ntb_spad_write(qp->ndev, spad + 1, qp->msi_desc.data); | |
755 | if (rc) | |
756 | goto err_free_interrupt; | |
757 | ||
758 | dev_dbg(&qp->ndev->pdev->dev, "QP%d MSI %d addr=%x data=%x\n", | |
759 | qp_num, qp->msi_irq, qp->msi_desc.addr_offset, | |
760 | qp->msi_desc.data); | |
761 | ||
762 | return; | |
763 | ||
764 | err_free_interrupt: | |
765 | devm_free_irq(&nt->ndev->dev, qp->msi_irq, qp); | |
766 | } | |
767 | ||
768 | static void ntb_transport_msi_peer_desc_changed(struct ntb_transport_ctx *nt) | |
769 | { | |
770 | int i; | |
771 | ||
772 | dev_dbg(&nt->ndev->pdev->dev, "Peer MSI descriptors changed"); | |
773 | ||
774 | for (i = 0; i < nt->qp_count; i++) | |
775 | ntb_transport_setup_qp_peer_msi(nt, i); | |
776 | } | |
777 | ||
778 | static void ntb_transport_msi_desc_changed(void *data) | |
779 | { | |
780 | struct ntb_transport_ctx *nt = data; | |
781 | int i; | |
782 | ||
783 | dev_dbg(&nt->ndev->pdev->dev, "MSI descriptors changed"); | |
784 | ||
785 | for (i = 0; i < nt->qp_count; i++) | |
786 | ntb_transport_setup_qp_msi(nt, i); | |
787 | ||
788 | ntb_peer_db_set(nt->ndev, nt->msi_db_mask); | |
789 | } | |
790 | ||
e26a5843 | 791 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 792 | { |
e26a5843 AH |
793 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
794 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
795 | |
796 | if (!mw->virt_addr) | |
797 | return; | |
798 | ||
443b9a14 | 799 | ntb_mw_clear_trans(nt->ndev, PIDX, num_mw); |
fc5d1829 AS |
800 | dma_free_coherent(&pdev->dev, mw->alloc_size, |
801 | mw->alloc_addr, mw->dma_addr); | |
e26a5843 AH |
802 | mw->xlat_size = 0; |
803 | mw->buff_size = 0; | |
fc5d1829 AS |
804 | mw->alloc_size = 0; |
805 | mw->alloc_addr = NULL; | |
b77b2637 JM |
806 | mw->virt_addr = NULL; |
807 | } | |
808 | ||
fc5d1829 AS |
809 | static int ntb_alloc_mw_buffer(struct ntb_transport_mw *mw, |
810 | struct device *dma_dev, size_t align) | |
811 | { | |
812 | dma_addr_t dma_addr; | |
813 | void *alloc_addr, *virt_addr; | |
814 | int rc; | |
815 | ||
816 | alloc_addr = dma_alloc_coherent(dma_dev, mw->alloc_size, | |
817 | &dma_addr, GFP_KERNEL); | |
818 | if (!alloc_addr) { | |
819 | dev_err(dma_dev, "Unable to alloc MW buff of size %zu\n", | |
820 | mw->alloc_size); | |
821 | return -ENOMEM; | |
822 | } | |
823 | virt_addr = alloc_addr; | |
824 | ||
825 | /* | |
826 | * we must ensure that the memory address allocated is BAR size | |
827 | * aligned in order for the XLAT register to take the value. This | |
828 | * is a requirement of the hardware. It is recommended to setup CMA | |
829 | * for BAR sizes equal or greater than 4MB. | |
830 | */ | |
831 | if (!IS_ALIGNED(dma_addr, align)) { | |
832 | if (mw->alloc_size > mw->buff_size) { | |
833 | virt_addr = PTR_ALIGN(alloc_addr, align); | |
834 | dma_addr = ALIGN(dma_addr, align); | |
835 | } else { | |
836 | rc = -ENOMEM; | |
837 | goto err; | |
838 | } | |
839 | } | |
840 | ||
841 | mw->alloc_addr = alloc_addr; | |
842 | mw->virt_addr = virt_addr; | |
843 | mw->dma_addr = dma_addr; | |
844 | ||
845 | return 0; | |
846 | ||
847 | err: | |
848 | dma_free_coherent(dma_dev, mw->alloc_size, alloc_addr, dma_addr); | |
849 | ||
850 | return rc; | |
851 | } | |
852 | ||
e26a5843 | 853 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
8c9edf63 | 854 | resource_size_t size) |
fce8a7bb | 855 | { |
e26a5843 AH |
856 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
857 | struct pci_dev *pdev = nt->ndev->pdev; | |
8c9edf63 | 858 | size_t xlat_size, buff_size; |
980c41c8 LG |
859 | resource_size_t xlat_align; |
860 | resource_size_t xlat_align_size; | |
e26a5843 AH |
861 | int rc; |
862 | ||
8c9edf63 AH |
863 | if (!size) |
864 | return -EINVAL; | |
865 | ||
980c41c8 LG |
866 | rc = ntb_mw_get_align(nt->ndev, PIDX, num_mw, &xlat_align, |
867 | &xlat_align_size, NULL); | |
868 | if (rc) | |
869 | return rc; | |
870 | ||
871 | xlat_size = round_up(size, xlat_align_size); | |
872 | buff_size = round_up(size, xlat_align); | |
fce8a7bb | 873 | |
b77b2637 | 874 | /* No need to re-setup */ |
e26a5843 | 875 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
876 | return 0; |
877 | ||
e26a5843 | 878 | if (mw->buff_size) |
b77b2637 JM |
879 | ntb_free_mw(nt, num_mw); |
880 | ||
e26a5843 AH |
881 | /* Alloc memory for receiving data. Must be aligned */ |
882 | mw->xlat_size = xlat_size; | |
883 | mw->buff_size = buff_size; | |
fc5d1829 | 884 | mw->alloc_size = buff_size; |
fce8a7bb | 885 | |
fc5d1829 AS |
886 | rc = ntb_alloc_mw_buffer(mw, &pdev->dev, xlat_align); |
887 | if (rc) { | |
888 | mw->alloc_size *= 2; | |
889 | rc = ntb_alloc_mw_buffer(mw, &pdev->dev, xlat_align); | |
890 | if (rc) { | |
891 | dev_err(&pdev->dev, | |
892 | "Unable to alloc aligned MW buff\n"); | |
893 | mw->xlat_size = 0; | |
894 | mw->buff_size = 0; | |
895 | mw->alloc_size = 0; | |
896 | return rc; | |
897 | } | |
3cc5ba19 DJ |
898 | } |
899 | ||
fce8a7bb | 900 | /* Notify HW the memory location of the receive buffer */ |
443b9a14 SS |
901 | rc = ntb_mw_set_trans(nt->ndev, PIDX, num_mw, mw->dma_addr, |
902 | mw->xlat_size); | |
e26a5843 AH |
903 | if (rc) { |
904 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
905 | ntb_free_mw(nt, num_mw); | |
906 | return -EIO; | |
907 | } | |
fce8a7bb JM |
908 | |
909 | return 0; | |
910 | } | |
911 | ||
2849b5d7 AH |
912 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
913 | { | |
914 | qp->link_is_up = false; | |
e9021331 | 915 | qp->active = false; |
2849b5d7 AH |
916 | |
917 | qp->tx_index = 0; | |
918 | qp->rx_index = 0; | |
919 | qp->rx_bytes = 0; | |
920 | qp->rx_pkts = 0; | |
921 | qp->rx_ring_empty = 0; | |
922 | qp->rx_err_no_buf = 0; | |
923 | qp->rx_err_oflow = 0; | |
924 | qp->rx_err_ver = 0; | |
925 | qp->rx_memcpy = 0; | |
926 | qp->rx_async = 0; | |
927 | qp->tx_bytes = 0; | |
928 | qp->tx_pkts = 0; | |
929 | qp->tx_ring_full = 0; | |
930 | qp->tx_err_no_buf = 0; | |
931 | qp->tx_memcpy = 0; | |
932 | qp->tx_async = 0; | |
933 | } | |
934 | ||
fca4d518 | 935 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 936 | { |
e26a5843 AH |
937 | struct ntb_transport_ctx *nt = qp->transport; |
938 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 939 | |
e22e0b9d | 940 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
941 | |
942 | cancel_delayed_work_sync(&qp->link_work); | |
943 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
944 | |
945 | if (qp->event_handler) | |
946 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
947 | } |
948 | ||
949 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
950 | { | |
951 | struct ntb_transport_qp *qp = container_of(work, | |
952 | struct ntb_transport_qp, | |
953 | link_cleanup); | |
e26a5843 | 954 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
955 | |
956 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 957 | |
e26a5843 | 958 | if (nt->link_is_up) |
fce8a7bb JM |
959 | schedule_delayed_work(&qp->link_work, |
960 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
961 | } | |
962 | ||
7b4f2d3c JM |
963 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
964 | { | |
965 | schedule_work(&qp->link_cleanup); | |
966 | } | |
967 | ||
e26a5843 | 968 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 969 | { |
e26a5843 AH |
970 | struct ntb_transport_qp *qp; |
971 | u64 qp_bitmap_alloc; | |
b17faba0 | 972 | unsigned int i, count; |
fce8a7bb | 973 | |
e26a5843 AH |
974 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
975 | ||
fca4d518 | 976 | /* Pass along the info to any clients */ |
e26a5843 AH |
977 | for (i = 0; i < nt->qp_count; i++) |
978 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
979 | qp = &nt->qp_vec[i]; | |
980 | ntb_qp_link_cleanup(qp); | |
981 | cancel_work_sync(&qp->link_cleanup); | |
982 | cancel_delayed_work_sync(&qp->link_work); | |
983 | } | |
fca4d518 | 984 | |
e26a5843 | 985 | if (!nt->link_is_up) |
fce8a7bb | 986 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 987 | |
9143595a JZ |
988 | for (i = 0; i < nt->mw_count; i++) |
989 | ntb_free_mw(nt, i); | |
990 | ||
fce8a7bb JM |
991 | /* The scratchpad registers keep the values if the remote side |
992 | * goes down, blast them now to give them a sane value the next | |
993 | * time they are accessed | |
994 | */ | |
b17faba0 SS |
995 | count = ntb_spad_count(nt->ndev); |
996 | for (i = 0; i < count; i++) | |
e26a5843 | 997 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
998 | } |
999 | ||
fca4d518 JM |
1000 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
1001 | { | |
e26a5843 AH |
1002 | struct ntb_transport_ctx *nt = |
1003 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
1004 | |
1005 | ntb_transport_link_cleanup(nt); | |
1006 | } | |
1007 | ||
e26a5843 | 1008 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 1009 | { |
e26a5843 | 1010 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 1011 | |
e26a5843 | 1012 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 1013 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 1014 | else |
7b4f2d3c | 1015 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
1016 | } |
1017 | ||
1018 | static void ntb_transport_link_work(struct work_struct *work) | |
1019 | { | |
e26a5843 AH |
1020 | struct ntb_transport_ctx *nt = |
1021 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
1022 | struct ntb_dev *ndev = nt->ndev; | |
1023 | struct pci_dev *pdev = ndev->pdev; | |
1024 | resource_size_t size; | |
fce8a7bb | 1025 | u32 val; |
84f76685 | 1026 | int rc = 0, i, spad; |
fce8a7bb | 1027 | |
113fc505 | 1028 | /* send the local info, in the opposite order of the way we read it */ |
2b0569b3 LG |
1029 | |
1030 | if (nt->use_msi) { | |
1031 | rc = ntb_msi_setup_mws(ndev); | |
1032 | if (rc) { | |
1033 | dev_warn(&pdev->dev, | |
1034 | "Failed to register MSI memory window: %d\n", | |
1035 | rc); | |
1036 | nt->use_msi = false; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | for (i = 0; i < nt->qp_count; i++) | |
1041 | ntb_transport_setup_qp_msi(nt, i); | |
1042 | ||
e26a5843 AH |
1043 | for (i = 0; i < nt->mw_count; i++) { |
1044 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 1045 | |
e26a5843 AH |
1046 | if (max_mw_size && size > max_mw_size) |
1047 | size = max_mw_size; | |
fce8a7bb | 1048 | |
e26a5843 | 1049 | spad = MW0_SZ_HIGH + (i * 2); |
d67288a3 | 1050 | ntb_peer_spad_write(ndev, PIDX, spad, upper_32_bits(size)); |
fce8a7bb | 1051 | |
e26a5843 | 1052 | spad = MW0_SZ_LOW + (i * 2); |
d67288a3 | 1053 | ntb_peer_spad_write(ndev, PIDX, spad, lower_32_bits(size)); |
fce8a7bb JM |
1054 | } |
1055 | ||
d67288a3 | 1056 | ntb_peer_spad_write(ndev, PIDX, NUM_MWS, nt->mw_count); |
fce8a7bb | 1057 | |
d67288a3 | 1058 | ntb_peer_spad_write(ndev, PIDX, NUM_QPS, nt->qp_count); |
fce8a7bb | 1059 | |
d67288a3 | 1060 | ntb_peer_spad_write(ndev, PIDX, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 1061 | |
e26a5843 | 1062 | /* Query the remote side for its info */ |
0f69a7df | 1063 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
1064 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
1065 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 1066 | goto out; |
fce8a7bb | 1067 | |
0f69a7df | 1068 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 1069 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 1070 | if (val != nt->qp_count) |
fce8a7bb | 1071 | goto out; |
fce8a7bb | 1072 | |
0f69a7df | 1073 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 1074 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
1075 | if (val != nt->mw_count) |
1076 | goto out; | |
fce8a7bb | 1077 | |
e26a5843 | 1078 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 1079 | u64 val64; |
fce8a7bb | 1080 | |
0f69a7df | 1081 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 1082 | val64 = (u64)val << 32; |
113fc505 | 1083 | |
0f69a7df | 1084 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
1085 | val64 |= val; |
1086 | ||
e26a5843 | 1087 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
1088 | |
1089 | rc = ntb_set_mw(nt, i, val64); | |
1090 | if (rc) | |
1091 | goto out1; | |
1092 | } | |
fce8a7bb | 1093 | |
e26a5843 | 1094 | nt->link_is_up = true; |
fce8a7bb | 1095 | |
e26a5843 AH |
1096 | for (i = 0; i < nt->qp_count; i++) { |
1097 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
1098 | |
1099 | ntb_transport_setup_qp_mw(nt, i); | |
2b0569b3 | 1100 | ntb_transport_setup_qp_peer_msi(nt, i); |
fce8a7bb | 1101 | |
e26a5843 | 1102 | if (qp->client_ready) |
fce8a7bb JM |
1103 | schedule_delayed_work(&qp->link_work, 0); |
1104 | } | |
1105 | ||
1106 | return; | |
1107 | ||
113fc505 | 1108 | out1: |
e26a5843 | 1109 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 1110 | ntb_free_mw(nt, i); |
84f76685 DJ |
1111 | |
1112 | /* if there's an actual failure, we should just bail */ | |
f3fd2afe | 1113 | if (rc < 0) |
84f76685 | 1114 | return; |
84f76685 | 1115 | |
fce8a7bb | 1116 | out: |
e26a5843 | 1117 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
1118 | schedule_delayed_work(&nt->link_work, |
1119 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
1120 | } | |
1121 | ||
1122 | static void ntb_qp_link_work(struct work_struct *work) | |
1123 | { | |
1124 | struct ntb_transport_qp *qp = container_of(work, | |
1125 | struct ntb_transport_qp, | |
1126 | link_work.work); | |
e26a5843 AH |
1127 | struct pci_dev *pdev = qp->ndev->pdev; |
1128 | struct ntb_transport_ctx *nt = qp->transport; | |
1129 | int val; | |
fce8a7bb | 1130 | |
e26a5843 | 1131 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 1132 | |
e26a5843 | 1133 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 1134 | |
d67288a3 | 1135 | ntb_peer_spad_write(nt->ndev, PIDX, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
1136 | |
1137 | /* query remote spad for qp ready bits */ | |
28762289 | 1138 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
1139 | |
1140 | /* See if the remote side is up */ | |
e26a5843 | 1141 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 1142 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 | 1143 | qp->link_is_up = true; |
e9021331 | 1144 | qp->active = true; |
e26a5843 | 1145 | |
fce8a7bb | 1146 | if (qp->event_handler) |
e26a5843 | 1147 | qp->event_handler(qp->cb_data, qp->link_is_up); |
8b5a22d8 | 1148 | |
e9021331 DJ |
1149 | if (qp->active) |
1150 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 1151 | } else if (nt->link_is_up) |
fce8a7bb JM |
1152 | schedule_delayed_work(&qp->link_work, |
1153 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
1154 | } | |
1155 | ||
e26a5843 | 1156 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 1157 | unsigned int qp_num) |
fce8a7bb JM |
1158 | { |
1159 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
1160 | phys_addr_t mw_base; |
1161 | resource_size_t mw_size; | |
ef114ed5 | 1162 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 1163 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 1164 | u64 qp_offset; |
948d3a65 | 1165 | |
e26a5843 AH |
1166 | mw_count = nt->mw_count; |
1167 | qp_count = nt->qp_count; | |
fce8a7bb | 1168 | |
e26a5843 | 1169 | mw_num = QP_TO_MW(nt, qp_num); |
e26a5843 AH |
1170 | |
1171 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
1172 | qp->qp_num = qp_num; |
1173 | qp->transport = nt; | |
1174 | qp->ndev = nt->ndev; | |
e26a5843 | 1175 | qp->client_ready = false; |
fce8a7bb | 1176 | qp->event_handler = NULL; |
2849b5d7 | 1177 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 1178 | |
8e8496e0 | 1179 | if (mw_num < qp_count % mw_count) |
e26a5843 | 1180 | num_qps_mw = qp_count / mw_count + 1; |
ef114ed5 | 1181 | else |
e26a5843 AH |
1182 | num_qps_mw = qp_count / mw_count; |
1183 | ||
1184 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
1185 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 1186 | |
cbd27448 LG |
1187 | if (max_mw_size && mw_size > max_mw_size) |
1188 | mw_size = max_mw_size; | |
1189 | ||
e26a5843 | 1190 | tx_size = (unsigned int)mw_size / num_qps_mw; |
c92ba3c5 | 1191 | qp_offset = tx_size * (qp_num / mw_count); |
e26a5843 | 1192 | |
c59666bb | 1193 | qp->tx_mw_size = tx_size; |
e26a5843 | 1194 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; |
282a2fee JM |
1195 | if (!qp->tx_mw) |
1196 | return -EINVAL; | |
1197 | ||
e26a5843 | 1198 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
1199 | if (!qp->tx_mw_phys) |
1200 | return -EINVAL; | |
1201 | ||
793c20e9 | 1202 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 1203 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 1204 | |
c9d534c8 JM |
1205 | /* Due to housekeeping, there must be atleast 2 buffs */ |
1206 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 1207 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 1208 | |
c8650fd0 | 1209 | if (nt->debugfs_node_dir) { |
fce8a7bb JM |
1210 | char debugfs_name[4]; |
1211 | ||
1212 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
1213 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
c8650fd0 | 1214 | nt->debugfs_node_dir); |
fce8a7bb JM |
1215 | |
1216 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
1217 | qp->debugfs_dir, qp, | |
1218 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
1219 | } else { |
1220 | qp->debugfs_dir = NULL; | |
1221 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
1222 | } |
1223 | ||
1224 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 1225 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb | 1226 | |
da2e5ae5 | 1227 | spin_lock_init(&qp->ntb_rx_q_lock); |
fce8a7bb JM |
1228 | spin_lock_init(&qp->ntb_tx_free_q_lock); |
1229 | ||
da2e5ae5 | 1230 | INIT_LIST_HEAD(&qp->rx_post_q); |
fce8a7bb JM |
1231 | INIT_LIST_HEAD(&qp->rx_pend_q); |
1232 | INIT_LIST_HEAD(&qp->rx_free_q); | |
1233 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 1234 | |
e26a5843 AH |
1235 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
1236 | (unsigned long)qp); | |
1237 | ||
282a2fee | 1238 | return 0; |
fce8a7bb JM |
1239 | } |
1240 | ||
e26a5843 | 1241 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1242 | { |
e26a5843 AH |
1243 | struct ntb_transport_ctx *nt; |
1244 | struct ntb_transport_mw *mw; | |
b17faba0 | 1245 | unsigned int mw_count, qp_count, spad_count, max_mw_count_for_spads; |
e26a5843 | 1246 | u64 qp_bitmap; |
1199aa61 | 1247 | int node; |
fce8a7bb JM |
1248 | int rc, i; |
1249 | ||
bc240eec | 1250 | mw_count = ntb_peer_mw_count(ndev); |
443b9a14 SS |
1251 | |
1252 | if (!ndev->ops->mw_set_trans) { | |
1253 | dev_err(&ndev->dev, "Inbound MW based NTB API is required\n"); | |
1254 | return -EINVAL; | |
1255 | } | |
19645a07 | 1256 | |
e26a5843 AH |
1257 | if (ntb_db_is_unsafe(ndev)) |
1258 | dev_dbg(&ndev->dev, | |
1259 | "doorbell is unsafe, proceed anyway...\n"); | |
1260 | if (ntb_spad_is_unsafe(ndev)) | |
1261 | dev_dbg(&ndev->dev, | |
1262 | "scratchpad is unsafe, proceed anyway...\n"); | |
1263 | ||
1e530119 SS |
1264 | if (ntb_peer_port_count(ndev) != NTB_DEF_PEER_CNT) |
1265 | dev_warn(&ndev->dev, "Multi-port NTB devices unsupported\n"); | |
1266 | ||
1199aa61 AH |
1267 | node = dev_to_node(&ndev->dev); |
1268 | ||
1269 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
1270 | if (!nt) |
1271 | return -ENOMEM; | |
1272 | ||
e26a5843 | 1273 | nt->ndev = ndev; |
2b0569b3 LG |
1274 | |
1275 | /* | |
1276 | * If we are using MSI, and have at least one extra memory window, | |
1277 | * we will reserve the last MW for the MSI window. | |
1278 | */ | |
1279 | if (use_msi && mw_count > 1) { | |
1280 | rc = ntb_msi_init(ndev, ntb_transport_msi_desc_changed); | |
1281 | if (!rc) { | |
1282 | mw_count -= 1; | |
1283 | nt->use_msi = true; | |
1284 | } | |
1285 | } | |
1286 | ||
b17faba0 SS |
1287 | spad_count = ntb_spad_count(ndev); |
1288 | ||
1289 | /* Limit the MW's based on the availability of scratchpads */ | |
1290 | ||
1291 | if (spad_count < NTB_TRANSPORT_MIN_SPADS) { | |
1292 | nt->mw_count = 0; | |
1293 | rc = -EINVAL; | |
1294 | goto err; | |
1295 | } | |
e26a5843 | 1296 | |
b17faba0 SS |
1297 | max_mw_count_for_spads = (spad_count - MW0_SZ_HIGH) / 2; |
1298 | nt->mw_count = min(mw_count, max_mw_count_for_spads); | |
e26a5843 | 1299 | |
2b0569b3 LG |
1300 | nt->msi_spad_offset = nt->mw_count * 2 + MW0_SZ_HIGH; |
1301 | ||
590b5b7d | 1302 | nt->mw_vec = kcalloc_node(mw_count, sizeof(*nt->mw_vec), |
1199aa61 | 1303 | GFP_KERNEL, node); |
e26a5843 AH |
1304 | if (!nt->mw_vec) { |
1305 | rc = -ENOMEM; | |
fce8a7bb JM |
1306 | goto err; |
1307 | } | |
1308 | ||
e26a5843 AH |
1309 | for (i = 0; i < mw_count; i++) { |
1310 | mw = &nt->mw_vec[i]; | |
1311 | ||
443b9a14 SS |
1312 | rc = ntb_peer_mw_get_addr(ndev, i, &mw->phys_addr, |
1313 | &mw->phys_size); | |
e26a5843 AH |
1314 | if (rc) |
1315 | goto err1; | |
1316 | ||
06917f75 | 1317 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
1318 | if (!mw->vbase) { |
1319 | rc = -ENOMEM; | |
1320 | goto err1; | |
1321 | } | |
1322 | ||
1323 | mw->buff_size = 0; | |
1324 | mw->xlat_size = 0; | |
1325 | mw->virt_addr = NULL; | |
1326 | mw->dma_addr = 0; | |
948d3a65 JM |
1327 | } |
1328 | ||
e26a5843 AH |
1329 | qp_bitmap = ntb_db_valid_mask(ndev); |
1330 | ||
1331 | qp_count = ilog2(qp_bitmap); | |
2b0569b3 LG |
1332 | if (nt->use_msi) { |
1333 | qp_count -= 1; | |
1334 | nt->msi_db_mask = 1 << qp_count; | |
1335 | ntb_db_clear_mask(ndev, nt->msi_db_mask); | |
1336 | } | |
1337 | ||
e26a5843 AH |
1338 | if (max_num_clients && max_num_clients < qp_count) |
1339 | qp_count = max_num_clients; | |
cb827ee6 LG |
1340 | else if (nt->mw_count < qp_count) |
1341 | qp_count = nt->mw_count; | |
e26a5843 AH |
1342 | |
1343 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1344 | ||
1345 | nt->qp_count = qp_count; | |
1346 | nt->qp_bitmap = qp_bitmap; | |
1347 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1348 | |
590b5b7d | 1349 | nt->qp_vec = kcalloc_node(qp_count, sizeof(*nt->qp_vec), |
1199aa61 | 1350 | GFP_KERNEL, node); |
e26a5843 | 1351 | if (!nt->qp_vec) { |
fce8a7bb | 1352 | rc = -ENOMEM; |
d4adee09 | 1353 | goto err1; |
fce8a7bb JM |
1354 | } |
1355 | ||
c8650fd0 DJ |
1356 | if (nt_debugfs_dir) { |
1357 | nt->debugfs_node_dir = | |
1358 | debugfs_create_dir(pci_name(ndev->pdev), | |
1359 | nt_debugfs_dir); | |
1360 | } | |
1361 | ||
e26a5843 | 1362 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1363 | rc = ntb_transport_init_queue(nt, i); |
1364 | if (rc) | |
d4adee09 | 1365 | goto err2; |
282a2fee | 1366 | } |
fce8a7bb JM |
1367 | |
1368 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1369 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1370 | |
e26a5843 | 1371 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1372 | if (rc) |
d4adee09 | 1373 | goto err2; |
fce8a7bb JM |
1374 | |
1375 | INIT_LIST_HEAD(&nt->client_devs); | |
1376 | rc = ntb_bus_init(nt); | |
1377 | if (rc) | |
d4adee09 | 1378 | goto err3; |
fce8a7bb | 1379 | |
e26a5843 AH |
1380 | nt->link_is_up = false; |
1381 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1382 | ntb_link_event(ndev); | |
fce8a7bb JM |
1383 | |
1384 | return 0; | |
1385 | ||
948d3a65 | 1386 | err3: |
d4adee09 | 1387 | ntb_clear_ctx(ndev); |
948d3a65 | 1388 | err2: |
d4adee09 | 1389 | kfree(nt->qp_vec); |
fce8a7bb | 1390 | err1: |
e26a5843 AH |
1391 | while (i--) { |
1392 | mw = &nt->mw_vec[i]; | |
1393 | iounmap(mw->vbase); | |
1394 | } | |
d4adee09 | 1395 | kfree(nt->mw_vec); |
fce8a7bb | 1396 | err: |
fce8a7bb JM |
1397 | kfree(nt); |
1398 | return rc; | |
1399 | } | |
1400 | ||
e26a5843 | 1401 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1402 | { |
e26a5843 AH |
1403 | struct ntb_transport_ctx *nt = ndev->ctx; |
1404 | struct ntb_transport_qp *qp; | |
1405 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1406 | int i; |
1407 | ||
fca4d518 | 1408 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1409 | cancel_work_sync(&nt->link_cleanup); |
1410 | cancel_delayed_work_sync(&nt->link_work); | |
1411 | ||
1412 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1413 | |
1414 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1415 | for (i = 0; i < nt->qp_count; i++) { |
1416 | qp = &nt->qp_vec[i]; | |
1417 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1418 | ntb_transport_free_queue(qp); | |
1419 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1420 | } |
fce8a7bb | 1421 | |
e26a5843 AH |
1422 | ntb_link_disable(ndev); |
1423 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1424 | |
e26a5843 | 1425 | ntb_bus_remove(nt); |
fce8a7bb | 1426 | |
e26a5843 | 1427 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1428 | ntb_free_mw(nt, i); |
e26a5843 AH |
1429 | iounmap(nt->mw_vec[i].vbase); |
1430 | } | |
fce8a7bb | 1431 | |
e26a5843 AH |
1432 | kfree(nt->qp_vec); |
1433 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1434 | kfree(nt); |
1435 | } | |
1436 | ||
da2e5ae5 | 1437 | static void ntb_complete_rxc(struct ntb_transport_qp *qp) |
fce8a7bb | 1438 | { |
da2e5ae5 AH |
1439 | struct ntb_queue_entry *entry; |
1440 | void *cb_data; | |
1441 | unsigned int len; | |
1442 | unsigned long irqflags; | |
1443 | ||
1444 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1445 | ||
1446 | while (!list_empty(&qp->rx_post_q)) { | |
1447 | entry = list_first_entry(&qp->rx_post_q, | |
1448 | struct ntb_queue_entry, entry); | |
1449 | if (!(entry->flags & DESC_DONE_FLAG)) | |
1450 | break; | |
1451 | ||
1452 | entry->rx_hdr->flags = 0; | |
72203572 | 1453 | iowrite32(entry->rx_index, &qp->rx_info->entry); |
da2e5ae5 AH |
1454 | |
1455 | cb_data = entry->cb_data; | |
1456 | len = entry->len; | |
1457 | ||
1458 | list_move_tail(&entry->entry, &qp->rx_free_q); | |
1459 | ||
1460 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); | |
1461 | ||
1462 | if (qp->rx_handler && qp->client_ready) | |
1463 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
1464 | ||
1465 | spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); | |
1466 | } | |
282a2fee | 1467 | |
da2e5ae5 AH |
1468 | spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
1469 | } | |
fce8a7bb | 1470 | |
72203572 DJ |
1471 | static void ntb_rx_copy_callback(void *data, |
1472 | const struct dmaengine_result *res) | |
da2e5ae5 AH |
1473 | { |
1474 | struct ntb_queue_entry *entry = data; | |
fce8a7bb | 1475 | |
72203572 DJ |
1476 | /* we need to check DMA results if we are using DMA */ |
1477 | if (res) { | |
1478 | enum dmaengine_tx_result dma_err = res->result; | |
1479 | ||
1480 | switch (dma_err) { | |
1481 | case DMA_TRANS_READ_FAILED: | |
1482 | case DMA_TRANS_WRITE_FAILED: | |
1483 | entry->errors++; | |
df561f66 | 1484 | fallthrough; |
72203572 DJ |
1485 | case DMA_TRANS_ABORTED: |
1486 | { | |
1487 | struct ntb_transport_qp *qp = entry->qp; | |
1488 | void *offset = qp->rx_buff + qp->rx_max_frame * | |
1489 | qp->rx_index; | |
1490 | ||
1491 | ntb_memcpy_rx(entry, offset); | |
1492 | qp->rx_memcpy++; | |
1493 | return; | |
1494 | } | |
1495 | ||
1496 | case DMA_TRANS_NOERROR: | |
1497 | default: | |
1498 | break; | |
1499 | } | |
1500 | } | |
1501 | ||
da2e5ae5 | 1502 | entry->flags |= DESC_DONE_FLAG; |
448c6fb3 | 1503 | |
da2e5ae5 | 1504 | ntb_complete_rxc(entry->qp); |
fce8a7bb JM |
1505 | } |
1506 | ||
282a2fee JM |
1507 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1508 | { | |
1509 | void *buf = entry->buf; | |
1510 | size_t len = entry->len; | |
1511 | ||
1512 | memcpy(buf, offset, len); | |
1513 | ||
e26a5843 AH |
1514 | /* Ensure that the data is fully copied out before clearing the flag */ |
1515 | wmb(); | |
1516 | ||
72203572 | 1517 | ntb_rx_copy_callback(entry, NULL); |
282a2fee JM |
1518 | } |
1519 | ||
72203572 | 1520 | static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset) |
282a2fee JM |
1521 | { |
1522 | struct dma_async_tx_descriptor *txd; | |
1523 | struct ntb_transport_qp *qp = entry->qp; | |
569410ca | 1524 | struct dma_chan *chan = qp->rx_dma_chan; |
282a2fee | 1525 | struct dma_device *device; |
da2e5ae5 | 1526 | size_t pay_off, buff_off, len; |
6f57fd05 | 1527 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1528 | dma_cookie_t cookie; |
1529 | void *buf = entry->buf; | |
282a2fee | 1530 | |
da2e5ae5 | 1531 | len = entry->len; |
282a2fee | 1532 | device = chan->device; |
e26a5843 AH |
1533 | pay_off = (size_t)offset & ~PAGE_MASK; |
1534 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1535 | |
1536 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
905921e7 | 1537 | goto err; |
282a2fee | 1538 | |
6f57fd05 BZ |
1539 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1540 | if (!unmap) | |
905921e7 | 1541 | goto err; |
282a2fee | 1542 | |
6f57fd05 BZ |
1543 | unmap->len = len; |
1544 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1545 | pay_off, len, DMA_TO_DEVICE); | |
1546 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1547 | goto err_get_unmap; | |
1548 | ||
1549 | unmap->to_cnt = 1; | |
282a2fee | 1550 | |
6f57fd05 BZ |
1551 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1552 | buff_off, len, DMA_FROM_DEVICE); | |
1553 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1554 | goto err_get_unmap; | |
1555 | ||
1556 | unmap->from_cnt = 1; | |
1557 | ||
88931ec3 AH |
1558 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
1559 | unmap->addr[0], len, | |
1560 | DMA_PREP_INTERRUPT); | |
1561 | if (!txd) | |
6f57fd05 | 1562 | goto err_get_unmap; |
282a2fee | 1563 | |
72203572 | 1564 | txd->callback_result = ntb_rx_copy_callback; |
282a2fee | 1565 | txd->callback_param = entry; |
6f57fd05 | 1566 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1567 | |
1568 | cookie = dmaengine_submit(txd); | |
1569 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1570 | goto err_set_unmap; |
1571 | ||
1572 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1573 | |
1574 | qp->last_cookie = cookie; | |
1575 | ||
1576 | qp->rx_async++; | |
1577 | ||
72203572 | 1578 | return 0; |
282a2fee | 1579 | |
6f57fd05 BZ |
1580 | err_set_unmap: |
1581 | dmaengine_unmap_put(unmap); | |
1582 | err_get_unmap: | |
1583 | dmaengine_unmap_put(unmap); | |
72203572 DJ |
1584 | err: |
1585 | return -ENXIO; | |
1586 | } | |
1587 | ||
1588 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) | |
1589 | { | |
1590 | struct ntb_transport_qp *qp = entry->qp; | |
1591 | struct dma_chan *chan = qp->rx_dma_chan; | |
1592 | int res; | |
1593 | ||
1594 | if (!chan) | |
1595 | goto err; | |
1596 | ||
1597 | if (entry->len < copy_bytes) | |
1598 | goto err; | |
1599 | ||
1600 | res = ntb_async_rx_submit(entry, offset); | |
1601 | if (res < 0) | |
1602 | goto err; | |
1603 | ||
1604 | if (!entry->retries) | |
1605 | qp->rx_async++; | |
1606 | ||
1607 | return; | |
1608 | ||
282a2fee JM |
1609 | err: |
1610 | ntb_memcpy_rx(entry, offset); | |
1611 | qp->rx_memcpy++; | |
1612 | } | |
1613 | ||
fce8a7bb JM |
1614 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1615 | { | |
1616 | struct ntb_payload_header *hdr; | |
1617 | struct ntb_queue_entry *entry; | |
1618 | void *offset; | |
1619 | ||
793c20e9 JM |
1620 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1621 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1622 | ||
e26a5843 AH |
1623 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1624 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1625 | |
fce8a7bb | 1626 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1627 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1628 | qp->rx_ring_empty++; |
1629 | return -EAGAIN; | |
1630 | } | |
1631 | ||
e26a5843 AH |
1632 | if (hdr->flags & LINK_DOWN_FLAG) { |
1633 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1634 | ntb_qp_link_down(qp); | |
1635 | hdr->flags = 0; | |
c0900b33 | 1636 | return -EAGAIN; |
e26a5843 AH |
1637 | } |
1638 | ||
1639 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1640 | dev_dbg(&qp->ndev->pdev->dev, | |
1641 | "version mismatch, expected %llu - got %u\n", | |
1642 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1643 | qp->rx_err_ver++; |
1644 | return -EIO; | |
1645 | } | |
1646 | ||
da2e5ae5 | 1647 | entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); |
e26a5843 AH |
1648 | if (!entry) { |
1649 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1650 | qp->rx_err_no_buf++; | |
da2e5ae5 | 1651 | return -EAGAIN; |
fce8a7bb JM |
1652 | } |
1653 | ||
da2e5ae5 | 1654 | entry->rx_hdr = hdr; |
72203572 | 1655 | entry->rx_index = qp->rx_index; |
da2e5ae5 | 1656 | |
282a2fee | 1657 | if (hdr->len > entry->len) { |
e26a5843 AH |
1658 | dev_dbg(&qp->ndev->pdev->dev, |
1659 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1660 | hdr->len, entry->len); |
e26a5843 | 1661 | qp->rx_err_oflow++; |
282a2fee | 1662 | |
da2e5ae5 AH |
1663 | entry->len = -EIO; |
1664 | entry->flags |= DESC_DONE_FLAG; | |
fce8a7bb | 1665 | |
da2e5ae5 AH |
1666 | ntb_complete_rxc(qp); |
1667 | } else { | |
1668 | dev_dbg(&qp->ndev->pdev->dev, | |
1669 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1670 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
e26a5843 | 1671 | |
da2e5ae5 AH |
1672 | qp->rx_bytes += hdr->len; |
1673 | qp->rx_pkts++; | |
e26a5843 | 1674 | |
da2e5ae5 | 1675 | entry->len = hdr->len; |
282a2fee | 1676 | |
da2e5ae5 AH |
1677 | ntb_async_rx(entry, offset); |
1678 | } | |
fce8a7bb | 1679 | |
282a2fee JM |
1680 | qp->rx_index++; |
1681 | qp->rx_index %= qp->rx_max_entry; | |
1682 | ||
1683 | return 0; | |
fce8a7bb JM |
1684 | } |
1685 | ||
e26a5843 | 1686 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1687 | { |
e26a5843 | 1688 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1689 | int rc, i; |
fce8a7bb | 1690 | |
e26a5843 AH |
1691 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1692 | __func__, qp->qp_num); | |
e8aeb60c | 1693 | |
c336acd3 JM |
1694 | /* Limit the number of packets processed in a single interrupt to |
1695 | * provide fairness to others | |
1696 | */ | |
1697 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1698 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1699 | if (rc) |
1700 | break; | |
1701 | } | |
282a2fee | 1702 | |
569410ca DJ |
1703 | if (i && qp->rx_dma_chan) |
1704 | dma_async_issue_pending(qp->rx_dma_chan); | |
fce8a7bb | 1705 | |
e26a5843 AH |
1706 | if (i == qp->rx_max_entry) { |
1707 | /* there is more work to do */ | |
e9021331 DJ |
1708 | if (qp->active) |
1709 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
1710 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { |
1711 | /* the doorbell bit is set: clear it */ | |
1712 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1713 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1714 | ntb_db_read(qp->ndev); | |
1715 | ||
1716 | /* an interrupt may have arrived between finishing | |
1717 | * ntb_process_rxc and clearing the doorbell bit: | |
1718 | * there might be some more work to do. | |
1719 | */ | |
e9021331 DJ |
1720 | if (qp->active) |
1721 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 | 1722 | } |
fce8a7bb JM |
1723 | } |
1724 | ||
9cabc269 DJ |
1725 | static void ntb_tx_copy_callback(void *data, |
1726 | const struct dmaengine_result *res) | |
fce8a7bb | 1727 | { |
282a2fee JM |
1728 | struct ntb_queue_entry *entry = data; |
1729 | struct ntb_transport_qp *qp = entry->qp; | |
1730 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1731 | |
9cabc269 DJ |
1732 | /* we need to check DMA results if we are using DMA */ |
1733 | if (res) { | |
1734 | enum dmaengine_tx_result dma_err = res->result; | |
1735 | ||
1736 | switch (dma_err) { | |
1737 | case DMA_TRANS_READ_FAILED: | |
1738 | case DMA_TRANS_WRITE_FAILED: | |
1739 | entry->errors++; | |
df561f66 | 1740 | fallthrough; |
9cabc269 DJ |
1741 | case DMA_TRANS_ABORTED: |
1742 | { | |
1743 | void __iomem *offset = | |
1744 | qp->tx_mw + qp->tx_max_frame * | |
1745 | entry->tx_index; | |
1746 | ||
1747 | /* resubmit via CPU */ | |
1748 | ntb_memcpy_tx(entry, offset); | |
1749 | qp->tx_memcpy++; | |
1750 | return; | |
1751 | } | |
1752 | ||
1753 | case DMA_TRANS_NOERROR: | |
1754 | default: | |
1755 | break; | |
1756 | } | |
1757 | } | |
1758 | ||
74465645 | 1759 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1760 | |
2b0569b3 LG |
1761 | if (qp->use_msi) |
1762 | ntb_msi_peer_trigger(qp->ndev, PIDX, &qp->peer_msi_desc); | |
1763 | else | |
1764 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); | |
fce8a7bb JM |
1765 | |
1766 | /* The entry length can only be zero if the packet is intended to be a | |
1767 | * "link down" or similar. Since no payload is being sent in these | |
1768 | * cases, there is nothing to add to the completion queue. | |
1769 | */ | |
1770 | if (entry->len > 0) { | |
1771 | qp->tx_bytes += entry->len; | |
1772 | ||
1773 | if (qp->tx_handler) | |
1774 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1775 | entry->len); | |
1776 | } | |
1777 | ||
1778 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1779 | } | |
1780 | ||
282a2fee | 1781 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1782 | { |
06917f75 DJ |
1783 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1784 | /* | |
1785 | * Using non-temporal mov to improve performance on non-cached | |
1786 | * writes, even though we aren't actually copying from user space. | |
1787 | */ | |
1788 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1789 | #else | |
282a2fee | 1790 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1791 | #endif |
282a2fee | 1792 | |
e26a5843 AH |
1793 | /* Ensure that the data is fully copied out before setting the flags */ |
1794 | wmb(); | |
1795 | ||
9cabc269 | 1796 | ntb_tx_copy_callback(entry, NULL); |
282a2fee JM |
1797 | } |
1798 | ||
9cabc269 DJ |
1799 | static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
1800 | struct ntb_queue_entry *entry) | |
282a2fee | 1801 | { |
282a2fee | 1802 | struct dma_async_tx_descriptor *txd; |
569410ca | 1803 | struct dma_chan *chan = qp->tx_dma_chan; |
282a2fee | 1804 | struct dma_device *device; |
9cabc269 DJ |
1805 | size_t len = entry->len; |
1806 | void *buf = entry->buf; | |
282a2fee | 1807 | size_t dest_off, buff_off; |
6f57fd05 BZ |
1808 | struct dmaengine_unmap_data *unmap; |
1809 | dma_addr_t dest; | |
282a2fee | 1810 | dma_cookie_t cookie; |
fce8a7bb | 1811 | |
282a2fee | 1812 | device = chan->device; |
c59666bb | 1813 | dest = qp->tx_mw_dma_addr + qp->tx_max_frame * entry->tx_index; |
e26a5843 AH |
1814 | buff_off = (size_t)buf & ~PAGE_MASK; |
1815 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1816 | |
1817 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1818 | goto err; | |
1819 | ||
6f57fd05 BZ |
1820 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1821 | if (!unmap) | |
282a2fee JM |
1822 | goto err; |
1823 | ||
6f57fd05 BZ |
1824 | unmap->len = len; |
1825 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1826 | buff_off, len, DMA_TO_DEVICE); | |
1827 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1828 | goto err_get_unmap; | |
1829 | ||
1830 | unmap->to_cnt = 1; | |
1831 | ||
88931ec3 AH |
1832 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
1833 | DMA_PREP_INTERRUPT); | |
1834 | if (!txd) | |
6f57fd05 | 1835 | goto err_get_unmap; |
282a2fee | 1836 | |
9cabc269 | 1837 | txd->callback_result = ntb_tx_copy_callback; |
282a2fee | 1838 | txd->callback_param = entry; |
6f57fd05 | 1839 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1840 | |
1841 | cookie = dmaengine_submit(txd); | |
1842 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1843 | goto err_set_unmap; |
1844 | ||
1845 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1846 | |
1847 | dma_async_issue_pending(chan); | |
282a2fee | 1848 | |
9cabc269 | 1849 | return 0; |
6f57fd05 BZ |
1850 | err_set_unmap: |
1851 | dmaengine_unmap_put(unmap); | |
1852 | err_get_unmap: | |
1853 | dmaengine_unmap_put(unmap); | |
9cabc269 DJ |
1854 | err: |
1855 | return -ENXIO; | |
1856 | } | |
1857 | ||
1858 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1859 | struct ntb_queue_entry *entry) | |
1860 | { | |
1861 | struct ntb_payload_header __iomem *hdr; | |
1862 | struct dma_chan *chan = qp->tx_dma_chan; | |
1863 | void __iomem *offset; | |
1864 | int res; | |
1865 | ||
1866 | entry->tx_index = qp->tx_index; | |
1867 | offset = qp->tx_mw + qp->tx_max_frame * entry->tx_index; | |
1868 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1869 | entry->tx_hdr = hdr; | |
1870 | ||
1871 | iowrite32(entry->len, &hdr->len); | |
1872 | iowrite32((u32)qp->tx_pkts, &hdr->ver); | |
1873 | ||
1874 | if (!chan) | |
1875 | goto err; | |
1876 | ||
1877 | if (entry->len < copy_bytes) | |
1878 | goto err; | |
1879 | ||
1880 | res = ntb_async_tx_submit(qp, entry); | |
1881 | if (res < 0) | |
1882 | goto err; | |
1883 | ||
1884 | if (!entry->retries) | |
1885 | qp->tx_async++; | |
1886 | ||
1887 | return; | |
1888 | ||
282a2fee JM |
1889 | err: |
1890 | ntb_memcpy_tx(entry, offset); | |
1891 | qp->tx_memcpy++; | |
1892 | } | |
1893 | ||
1894 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1895 | struct ntb_queue_entry *entry) | |
1896 | { | |
793c20e9 | 1897 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1898 | qp->tx_ring_full++; |
1899 | return -EAGAIN; | |
1900 | } | |
1901 | ||
ef114ed5 | 1902 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb | 1903 | if (qp->tx_handler) |
179f912a | 1904 | qp->tx_handler(qp, qp->cb_data, NULL, -EIO); |
fce8a7bb JM |
1905 | |
1906 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1907 | &qp->tx_free_q); | |
1908 | return 0; | |
1909 | } | |
1910 | ||
282a2fee | 1911 | ntb_async_tx(qp, entry); |
fce8a7bb | 1912 | |
793c20e9 JM |
1913 | qp->tx_index++; |
1914 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1915 | |
1916 | qp->tx_pkts++; | |
1917 | ||
1918 | return 0; | |
1919 | } | |
1920 | ||
1921 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1922 | { | |
e26a5843 | 1923 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1924 | struct ntb_queue_entry *entry; |
1925 | int i, rc; | |
1926 | ||
e26a5843 | 1927 | if (!qp->link_is_up) |
fce8a7bb JM |
1928 | return; |
1929 | ||
e22e0b9d | 1930 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1931 | |
1932 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1933 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1934 | if (entry) |
1935 | break; | |
1936 | msleep(100); | |
1937 | } | |
1938 | ||
1939 | if (!entry) | |
1940 | return; | |
1941 | ||
1942 | entry->cb_data = NULL; | |
1943 | entry->buf = NULL; | |
1944 | entry->len = 0; | |
1945 | entry->flags = LINK_DOWN_FLAG; | |
1946 | ||
1947 | rc = ntb_process_tx(qp, entry); | |
1948 | if (rc) | |
1949 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1950 | qp->qp_num); | |
2849b5d7 AH |
1951 | |
1952 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1953 | } |
1954 | ||
1199aa61 AH |
1955 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1956 | { | |
1957 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1958 | } | |
1959 | ||
fce8a7bb JM |
1960 | /** |
1961 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1962 | * @rx_handler: receive callback function | |
1963 | * @tx_handler: transmit callback function | |
1964 | * @event_handler: event callback function | |
1965 | * | |
1966 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1967 | * routine for both transmit and receive. The receive callback routine will be | |
1968 | * used to pass up data when the transport has received it on the queue. The | |
1969 | * transmit callback routine will be called when the transport has completed the | |
1970 | * transmission of the data on the queue and the data is ready to be freed. | |
1971 | * | |
1972 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1973 | */ | |
1974 | struct ntb_transport_qp * | |
e26a5843 | 1975 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1976 | const struct ntb_queue_handlers *handlers) |
1977 | { | |
e26a5843 AH |
1978 | struct ntb_dev *ndev; |
1979 | struct pci_dev *pdev; | |
1980 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1981 | struct ntb_queue_entry *entry; |
1982 | struct ntb_transport_qp *qp; | |
e26a5843 | 1983 | u64 qp_bit; |
fce8a7bb | 1984 | unsigned int free_queue; |
1199aa61 AH |
1985 | dma_cap_mask_t dma_mask; |
1986 | int node; | |
e26a5843 | 1987 | int i; |
fce8a7bb | 1988 | |
e26a5843 AH |
1989 | ndev = dev_ntb(client_dev->parent); |
1990 | pdev = ndev->pdev; | |
1991 | nt = ndev->ctx; | |
fce8a7bb | 1992 | |
1199aa61 AH |
1993 | node = dev_to_node(&ndev->dev); |
1994 | ||
8fcd0950 | 1995 | free_queue = ffs(nt->qp_bitmap_free); |
fce8a7bb JM |
1996 | if (!free_queue) |
1997 | goto err; | |
1998 | ||
1999 | /* decrement free_queue to make it zero based */ | |
2000 | free_queue--; | |
2001 | ||
e26a5843 AH |
2002 | qp = &nt->qp_vec[free_queue]; |
2003 | qp_bit = BIT_ULL(qp->qp_num); | |
2004 | ||
2005 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 2006 | |
fce8a7bb JM |
2007 | qp->cb_data = data; |
2008 | qp->rx_handler = handlers->rx_handler; | |
2009 | qp->tx_handler = handlers->tx_handler; | |
2010 | qp->event_handler = handlers->event_handler; | |
2011 | ||
1199aa61 AH |
2012 | dma_cap_zero(dma_mask); |
2013 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
2014 | ||
a41ef053 | 2015 | if (use_dma) { |
569410ca DJ |
2016 | qp->tx_dma_chan = |
2017 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
2018 | (void *)(unsigned long)node); | |
2019 | if (!qp->tx_dma_chan) | |
2020 | dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n"); | |
2021 | ||
2022 | qp->rx_dma_chan = | |
2023 | dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
2024 | (void *)(unsigned long)node); | |
2025 | if (!qp->rx_dma_chan) | |
2026 | dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n"); | |
a41ef053 | 2027 | } else { |
569410ca DJ |
2028 | qp->tx_dma_chan = NULL; |
2029 | qp->rx_dma_chan = NULL; | |
a41ef053 | 2030 | } |
569410ca | 2031 | |
51cb8dbf | 2032 | qp->tx_mw_dma_addr = 0; |
c59666bb LG |
2033 | if (qp->tx_dma_chan) { |
2034 | qp->tx_mw_dma_addr = | |
2035 | dma_map_resource(qp->tx_dma_chan->device->dev, | |
2036 | qp->tx_mw_phys, qp->tx_mw_size, | |
2037 | DMA_FROM_DEVICE, 0); | |
2038 | if (dma_mapping_error(qp->tx_dma_chan->device->dev, | |
2039 | qp->tx_mw_dma_addr)) { | |
2040 | qp->tx_mw_dma_addr = 0; | |
2041 | goto err1; | |
2042 | } | |
2043 | } | |
2044 | ||
569410ca DJ |
2045 | dev_dbg(&pdev->dev, "Using %s memcpy for TX\n", |
2046 | qp->tx_dma_chan ? "DMA" : "CPU"); | |
2047 | ||
2048 | dev_dbg(&pdev->dev, "Using %s memcpy for RX\n", | |
2049 | qp->rx_dma_chan ? "DMA" : "CPU"); | |
282a2fee | 2050 | |
fce8a7bb | 2051 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
c9160b69 | 2052 | entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); |
fce8a7bb JM |
2053 | if (!entry) |
2054 | goto err1; | |
2055 | ||
282a2fee | 2056 | entry->qp = qp; |
da2e5ae5 | 2057 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
f766755c | 2058 | &qp->rx_free_q); |
fce8a7bb | 2059 | } |
a754a8fc | 2060 | qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; |
fce8a7bb | 2061 | |
a754a8fc | 2062 | for (i = 0; i < qp->tx_max_entry; i++) { |
c9160b69 | 2063 | entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); |
fce8a7bb JM |
2064 | if (!entry) |
2065 | goto err2; | |
2066 | ||
282a2fee | 2067 | entry->qp = qp; |
fce8a7bb | 2068 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 2069 | &qp->tx_free_q); |
fce8a7bb JM |
2070 | } |
2071 | ||
e26a5843 AH |
2072 | ntb_db_clear(qp->ndev, qp_bit); |
2073 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
2074 | |
2075 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
2076 | ||
2077 | return qp; | |
2078 | ||
fce8a7bb | 2079 | err2: |
f766755c | 2080 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
2081 | kfree(entry); |
2082 | err1: | |
a754a8fc | 2083 | qp->rx_alloc_entry = 0; |
da2e5ae5 | 2084 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb | 2085 | kfree(entry); |
c59666bb LG |
2086 | if (qp->tx_mw_dma_addr) |
2087 | dma_unmap_resource(qp->tx_dma_chan->device->dev, | |
2088 | qp->tx_mw_dma_addr, qp->tx_mw_size, | |
2089 | DMA_FROM_DEVICE, 0); | |
569410ca DJ |
2090 | if (qp->tx_dma_chan) |
2091 | dma_release_channel(qp->tx_dma_chan); | |
2092 | if (qp->rx_dma_chan) | |
2093 | dma_release_channel(qp->rx_dma_chan); | |
e26a5843 | 2094 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
2095 | err: |
2096 | return NULL; | |
2097 | } | |
2098 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
2099 | ||
2100 | /** | |
2101 | * ntb_transport_free_queue - Frees NTB transport queue | |
2102 | * @qp: NTB queue to be freed | |
2103 | * | |
2104 | * Frees NTB transport queue | |
2105 | */ | |
2106 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
2107 | { | |
186f27ff | 2108 | struct pci_dev *pdev; |
fce8a7bb | 2109 | struct ntb_queue_entry *entry; |
e26a5843 | 2110 | u64 qp_bit; |
fce8a7bb JM |
2111 | |
2112 | if (!qp) | |
2113 | return; | |
2114 | ||
e26a5843 | 2115 | pdev = qp->ndev->pdev; |
186f27ff | 2116 | |
e9021331 DJ |
2117 | qp->active = false; |
2118 | ||
569410ca DJ |
2119 | if (qp->tx_dma_chan) { |
2120 | struct dma_chan *chan = qp->tx_dma_chan; | |
2121 | /* Putting the dma_chan to NULL will force any new traffic to be | |
2122 | * processed by the CPU instead of the DAM engine | |
2123 | */ | |
2124 | qp->tx_dma_chan = NULL; | |
2125 | ||
2126 | /* Try to be nice and wait for any queued DMA engine | |
2127 | * transactions to process before smashing it with a rock | |
2128 | */ | |
2129 | dma_sync_wait(chan, qp->last_cookie); | |
2130 | dmaengine_terminate_all(chan); | |
c59666bb LG |
2131 | |
2132 | dma_unmap_resource(chan->device->dev, | |
2133 | qp->tx_mw_dma_addr, qp->tx_mw_size, | |
2134 | DMA_FROM_DEVICE, 0); | |
2135 | ||
569410ca DJ |
2136 | dma_release_channel(chan); |
2137 | } | |
2138 | ||
2139 | if (qp->rx_dma_chan) { | |
2140 | struct dma_chan *chan = qp->rx_dma_chan; | |
282a2fee JM |
2141 | /* Putting the dma_chan to NULL will force any new traffic to be |
2142 | * processed by the CPU instead of the DAM engine | |
2143 | */ | |
569410ca | 2144 | qp->rx_dma_chan = NULL; |
282a2fee JM |
2145 | |
2146 | /* Try to be nice and wait for any queued DMA engine | |
2147 | * transactions to process before smashing it with a rock | |
2148 | */ | |
2149 | dma_sync_wait(chan, qp->last_cookie); | |
2150 | dmaengine_terminate_all(chan); | |
1199aa61 | 2151 | dma_release_channel(chan); |
282a2fee | 2152 | } |
fce8a7bb | 2153 | |
e26a5843 AH |
2154 | qp_bit = BIT_ULL(qp->qp_num); |
2155 | ||
2156 | ntb_db_set_mask(qp->ndev, qp_bit); | |
e9021331 | 2157 | tasklet_kill(&qp->rxc_db_work); |
fce8a7bb | 2158 | |
282a2fee JM |
2159 | cancel_delayed_work_sync(&qp->link_work); |
2160 | ||
e26a5843 AH |
2161 | qp->cb_data = NULL; |
2162 | qp->rx_handler = NULL; | |
2163 | qp->tx_handler = NULL; | |
2164 | qp->event_handler = NULL; | |
2165 | ||
da2e5ae5 | 2166 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
2167 | kfree(entry); |
2168 | ||
da2e5ae5 AH |
2169 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) { |
2170 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n"); | |
2171 | kfree(entry); | |
2172 | } | |
2173 | ||
2174 | while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) { | |
2175 | dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n"); | |
fce8a7bb JM |
2176 | kfree(entry); |
2177 | } | |
2178 | ||
f766755c | 2179 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
2180 | kfree(entry); |
2181 | ||
30a4bb1e | 2182 | qp->transport->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
2183 | |
2184 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
2185 | } | |
2186 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
2187 | ||
2188 | /** | |
2189 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
2190 | * @qp: NTB queue to be freed | |
2191 | * @len: pointer to variable to write enqueued buffers length | |
2192 | * | |
2193 | * Dequeues unused buffers from receive queue. Should only be used during | |
2194 | * shutdown of qp. | |
2195 | * | |
2196 | * RETURNS: NULL error value on error, or void* for success. | |
2197 | */ | |
2198 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
2199 | { | |
2200 | struct ntb_queue_entry *entry; | |
2201 | void *buf; | |
2202 | ||
e26a5843 | 2203 | if (!qp || qp->client_ready) |
fce8a7bb JM |
2204 | return NULL; |
2205 | ||
da2e5ae5 | 2206 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q); |
fce8a7bb JM |
2207 | if (!entry) |
2208 | return NULL; | |
2209 | ||
2210 | buf = entry->cb_data; | |
2211 | *len = entry->len; | |
2212 | ||
da2e5ae5 | 2213 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
2214 | |
2215 | return buf; | |
2216 | } | |
2217 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
2218 | ||
2219 | /** | |
2220 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
2221 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
2222 | * @cb: per buffer pointer for callback function to use | |
2223 | * @data: pointer to data buffer that incoming packets will be copied into | |
2224 | * @len: length of the data buffer | |
2225 | * | |
2226 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
2227 | * payload can be received into. | |
2228 | * | |
2229 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2230 | */ | |
2231 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
2232 | unsigned int len) | |
2233 | { | |
2234 | struct ntb_queue_entry *entry; | |
2235 | ||
2236 | if (!qp) | |
2237 | return -EINVAL; | |
2238 | ||
da2e5ae5 | 2239 | entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q); |
fce8a7bb JM |
2240 | if (!entry) |
2241 | return -ENOMEM; | |
2242 | ||
2243 | entry->cb_data = cb; | |
2244 | entry->buf = data; | |
2245 | entry->len = len; | |
da2e5ae5 | 2246 | entry->flags = 0; |
72203572 DJ |
2247 | entry->retries = 0; |
2248 | entry->errors = 0; | |
2249 | entry->rx_index = 0; | |
da2e5ae5 AH |
2250 | |
2251 | ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q); | |
fce8a7bb | 2252 | |
e9021331 DJ |
2253 | if (qp->active) |
2254 | tasklet_schedule(&qp->rxc_db_work); | |
fce8a7bb JM |
2255 | |
2256 | return 0; | |
2257 | } | |
2258 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
2259 | ||
2260 | /** | |
2261 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
2262 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
2263 | * @cb: per buffer pointer for callback function to use | |
2264 | * @data: pointer to data buffer that will be sent | |
2265 | * @len: length of the data buffer | |
2266 | * | |
2267 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 2268 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
2269 | * serialize access to the qp. |
2270 | * | |
2271 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2272 | */ | |
2273 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
2274 | unsigned int len) | |
2275 | { | |
2276 | struct ntb_queue_entry *entry; | |
2277 | int rc; | |
2278 | ||
e26a5843 | 2279 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
2280 | return -EINVAL; |
2281 | ||
2282 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
2283 | if (!entry) { |
2284 | qp->tx_err_no_buf++; | |
e74bfeed | 2285 | return -EBUSY; |
282a2fee | 2286 | } |
fce8a7bb JM |
2287 | |
2288 | entry->cb_data = cb; | |
2289 | entry->buf = data; | |
2290 | entry->len = len; | |
2291 | entry->flags = 0; | |
9cabc269 DJ |
2292 | entry->errors = 0; |
2293 | entry->retries = 0; | |
2294 | entry->tx_index = 0; | |
fce8a7bb JM |
2295 | |
2296 | rc = ntb_process_tx(qp, entry); | |
2297 | if (rc) | |
2298 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
2299 | &qp->tx_free_q); | |
2300 | ||
2301 | return rc; | |
2302 | } | |
2303 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
2304 | ||
2305 | /** | |
2306 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
2307 | * @qp: NTB transport layer queue to be enabled | |
2308 | * | |
2309 | * Notify NTB transport layer of client readiness to use queue | |
2310 | */ | |
2311 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
2312 | { | |
2313 | if (!qp) | |
2314 | return; | |
2315 | ||
e26a5843 | 2316 | qp->client_ready = true; |
fce8a7bb | 2317 | |
e26a5843 | 2318 | if (qp->transport->link_is_up) |
fce8a7bb JM |
2319 | schedule_delayed_work(&qp->link_work, 0); |
2320 | } | |
2321 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
2322 | ||
2323 | /** | |
2324 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
2325 | * @qp: NTB transport layer queue to be disabled | |
2326 | * | |
2327 | * Notify NTB transport layer of client's desire to no longer receive data on | |
2328 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 2329 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
2330 | */ |
2331 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
2332 | { | |
e26a5843 | 2333 | int val; |
fce8a7bb JM |
2334 | |
2335 | if (!qp) | |
2336 | return; | |
2337 | ||
e26a5843 | 2338 | qp->client_ready = false; |
fce8a7bb | 2339 | |
e26a5843 | 2340 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 2341 | |
d67288a3 | 2342 | ntb_peer_spad_write(qp->ndev, PIDX, QP_LINKS, val & ~BIT(qp->qp_num)); |
fce8a7bb | 2343 | |
e26a5843 | 2344 | if (qp->link_is_up) |
fce8a7bb JM |
2345 | ntb_send_link_down(qp); |
2346 | else | |
2347 | cancel_delayed_work_sync(&qp->link_work); | |
2348 | } | |
2349 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
2350 | ||
2351 | /** | |
2352 | * ntb_transport_link_query - Query transport link state | |
2353 | * @qp: NTB transport layer queue to be queried | |
2354 | * | |
2355 | * Query connectivity to the remote system of the NTB transport queue | |
2356 | * | |
2357 | * RETURNS: true for link up or false for link down | |
2358 | */ | |
2359 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
2360 | { | |
186f27ff JM |
2361 | if (!qp) |
2362 | return false; | |
2363 | ||
e26a5843 | 2364 | return qp->link_is_up; |
fce8a7bb JM |
2365 | } |
2366 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
2367 | ||
2368 | /** | |
2369 | * ntb_transport_qp_num - Query the qp number | |
2370 | * @qp: NTB transport layer queue to be queried | |
2371 | * | |
2372 | * Query qp number of the NTB transport queue | |
2373 | * | |
2374 | * RETURNS: a zero based number specifying the qp number | |
2375 | */ | |
2376 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
2377 | { | |
186f27ff JM |
2378 | if (!qp) |
2379 | return 0; | |
2380 | ||
fce8a7bb JM |
2381 | return qp->qp_num; |
2382 | } | |
2383 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
2384 | ||
2385 | /** | |
2386 | * ntb_transport_max_size - Query the max payload size of a qp | |
2387 | * @qp: NTB transport layer queue to be queried | |
2388 | * | |
2389 | * Query the maximum payload size permissible on the given qp | |
2390 | * | |
2391 | * RETURNS: the max payload size of a qp | |
2392 | */ | |
ef114ed5 | 2393 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 2394 | { |
04afde45 | 2395 | unsigned int max_size; |
569410ca | 2396 | unsigned int copy_align; |
04afde45 | 2397 | struct dma_chan *rx_chan, *tx_chan; |
282a2fee | 2398 | |
186f27ff JM |
2399 | if (!qp) |
2400 | return 0; | |
2401 | ||
04afde45 DJ |
2402 | rx_chan = qp->rx_dma_chan; |
2403 | tx_chan = qp->tx_dma_chan; | |
282a2fee | 2404 | |
04afde45 DJ |
2405 | copy_align = max(rx_chan ? rx_chan->device->copy_align : 0, |
2406 | tx_chan ? tx_chan->device->copy_align : 0); | |
569410ca | 2407 | |
282a2fee | 2408 | /* If DMA engine usage is possible, try to find the max size for that */ |
04afde45 DJ |
2409 | max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header); |
2410 | max_size = round_down(max_size, 1 << copy_align); | |
282a2fee | 2411 | |
04afde45 | 2412 | return max_size; |
fce8a7bb JM |
2413 | } |
2414 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 | 2415 | |
e74bfeed DJ |
2416 | unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp) |
2417 | { | |
2418 | unsigned int head = qp->tx_index; | |
2419 | unsigned int tail = qp->remote_rx_info->entry; | |
2420 | ||
2421 | return tail > head ? tail - head : qp->tx_max_entry + tail - head; | |
2422 | } | |
2423 | EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry); | |
2424 | ||
e26a5843 AH |
2425 | static void ntb_transport_doorbell_callback(void *data, int vector) |
2426 | { | |
2427 | struct ntb_transport_ctx *nt = data; | |
2428 | struct ntb_transport_qp *qp; | |
2429 | u64 db_bits; | |
2430 | unsigned int qp_num; | |
2431 | ||
2b0569b3 LG |
2432 | if (ntb_db_read(nt->ndev) & nt->msi_db_mask) { |
2433 | ntb_transport_msi_peer_desc_changed(nt); | |
2434 | ntb_db_clear(nt->ndev, nt->msi_db_mask); | |
2435 | } | |
2436 | ||
e26a5843 AH |
2437 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & |
2438 | ntb_db_vector_mask(nt->ndev, vector)); | |
2439 | ||
2440 | while (db_bits) { | |
2441 | qp_num = __ffs(db_bits); | |
2442 | qp = &nt->qp_vec[qp_num]; | |
2443 | ||
e9021331 DJ |
2444 | if (qp->active) |
2445 | tasklet_schedule(&qp->rxc_db_work); | |
e26a5843 AH |
2446 | |
2447 | db_bits &= ~BIT_ULL(qp_num); | |
2448 | } | |
2449 | } | |
2450 | ||
2451 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
2452 | .link_event = ntb_transport_event_callback, | |
2453 | .db_event = ntb_transport_doorbell_callback, | |
2454 | }; | |
2455 | ||
2456 | static struct ntb_client ntb_transport_client = { | |
2457 | .ops = { | |
2458 | .probe = ntb_transport_probe, | |
2459 | .remove = ntb_transport_free, | |
2460 | }, | |
2461 | }; | |
2462 | ||
2463 | static int __init ntb_transport_init(void) | |
2464 | { | |
2465 | int rc; | |
2466 | ||
7eb38781 DJ |
2467 | pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
2468 | ||
e26a5843 AH |
2469 | if (debugfs_initialized()) |
2470 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
2471 | ||
2472 | rc = bus_register(&ntb_transport_bus); | |
2473 | if (rc) | |
2474 | goto err_bus; | |
2475 | ||
2476 | rc = ntb_register_client(&ntb_transport_client); | |
2477 | if (rc) | |
2478 | goto err_client; | |
2479 | ||
2480 | return 0; | |
2481 | ||
2482 | err_client: | |
2483 | bus_unregister(&ntb_transport_bus); | |
2484 | err_bus: | |
2485 | debugfs_remove_recursive(nt_debugfs_dir); | |
2486 | return rc; | |
2487 | } | |
2488 | module_init(ntb_transport_init); | |
2489 | ||
2490 | static void __exit ntb_transport_exit(void) | |
2491 | { | |
e26a5843 AH |
2492 | ntb_unregister_client(&ntb_transport_client); |
2493 | bus_unregister(&ntb_transport_bus); | |
dd62245e | 2494 | debugfs_remove_recursive(nt_debugfs_dir); |
e26a5843 AH |
2495 | } |
2496 | module_exit(ntb_transport_exit); |