blob: 60654d524858c4bf52f6c5b5668c90719f523eda [file] [log] [blame]
Jon Masonfce8a7b2012-11-16 19:27:12 -07001/*
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.
Allen Hubbee26a5842015-04-09 10:33:20 -04008 * Copyright (C) 2015 EMC Corporation. All Rights Reserved.
Jon Masonfce8a7b2012-11-16 19:27:12 -07009 *
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.
Allen Hubbee26a5842015-04-09 10:33:20 -040017 * Copyright (C) 2015 EMC Corporation. All Rights Reserved.
Jon Masonfce8a7b2012-11-16 19:27:12 -070018 *
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 *
Allen Hubbee26a5842015-04-09 10:33:20 -040045 * PCIe NTB Transport Linux driver
Jon Masonfce8a7b2012-11-16 19:27:12 -070046 *
47 * Contact Information:
48 * Jon Mason <jon.mason@intel.com>
49 */
50#include <linux/debugfs.h>
51#include <linux/delay.h>
Jon Mason282a2fe2013-02-12 09:52:50 -070052#include <linux/dmaengine.h>
Jon Masonfce8a7b2012-11-16 19:27:12 -070053#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>
Dave Jiang06917f72015-05-19 16:45:46 -040061#include <linux/uaccess.h>
Allen Hubbee26a5842015-04-09 10:33:20 -040062#include "linux/ntb.h"
63#include "linux/ntb_transport.h"
Jon Masonfce8a7b2012-11-16 19:27:12 -070064
Allen Hubbee26a5842015-04-09 10:33:20 -040065#define NTB_TRANSPORT_VERSION 4
66#define NTB_TRANSPORT_VER "4"
67#define NTB_TRANSPORT_NAME "ntb_transport"
68#define NTB_TRANSPORT_DESC "Software Queue-Pair Transport over NTB"
69
70MODULE_DESCRIPTION(NTB_TRANSPORT_DESC);
71MODULE_VERSION(NTB_TRANSPORT_VER);
72MODULE_LICENSE("Dual BSD/GPL");
73MODULE_AUTHOR("Intel Corporation");
74
75static unsigned long max_mw_size;
76module_param(max_mw_size, ulong, 0644);
77MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows");
Jon Masonfce8a7b2012-11-16 19:27:12 -070078
Dave Jiang98914172015-06-03 11:29:38 -040079static unsigned int transport_mtu = 0x10000;
Jon Masonfce8a7b2012-11-16 19:27:12 -070080module_param(transport_mtu, uint, 0644);
81MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets");
82
Jon Mason948d3a62013-04-18 17:07:36 -070083static unsigned char max_num_clients;
Jon Masonfce8a7b2012-11-16 19:27:12 -070084module_param(max_num_clients, byte, 0644);
85MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients");
86
Jon Mason282a2fe2013-02-12 09:52:50 -070087static unsigned int copy_bytes = 1024;
88module_param(copy_bytes, uint, 0644);
89MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA");
90
Dave Jianga41ef052015-05-19 16:52:04 -040091static bool use_dma;
92module_param(use_dma, bool, 0644);
93MODULE_PARM_DESC(use_dma, "Use DMA engine to perform large data copy");
94
Allen Hubbee26a5842015-04-09 10:33:20 -040095static struct dentry *nt_debugfs_dir;
96
Jon Masonfce8a7b2012-11-16 19:27:12 -070097struct ntb_queue_entry {
98 /* ntb_queue list reference */
99 struct list_head entry;
Allen Hubbee26a5842015-04-09 10:33:20 -0400100 /* pointers to data to be transferred */
Jon Masonfce8a7b2012-11-16 19:27:12 -0700101 void *cb_data;
102 void *buf;
103 unsigned int len;
104 unsigned int flags;
Jon Mason282a2fe2013-02-12 09:52:50 -0700105
106 struct ntb_transport_qp *qp;
107 union {
108 struct ntb_payload_header __iomem *tx_hdr;
109 struct ntb_payload_header *rx_hdr;
110 };
111 unsigned int index;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700112};
113
Jon Mason793c20e2013-01-19 02:02:26 -0700114struct ntb_rx_info {
115 unsigned int entry;
116};
117
Jon Masonfce8a7b2012-11-16 19:27:12 -0700118struct ntb_transport_qp {
Allen Hubbee26a5842015-04-09 10:33:20 -0400119 struct ntb_transport_ctx *transport;
120 struct ntb_dev *ndev;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700121 void *cb_data;
Dave Jiang569410ca2015-07-13 08:07:22 -0400122 struct dma_chan *tx_dma_chan;
123 struct dma_chan *rx_dma_chan;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700124
125 bool client_ready;
Allen Hubbee26a5842015-04-09 10:33:20 -0400126 bool link_is_up;
127
Jon Masonfce8a7b2012-11-16 19:27:12 -0700128 u8 qp_num; /* Only 64 QP's are allowed. 0-63 */
Allen Hubbee26a5842015-04-09 10:33:20 -0400129 u64 qp_bit;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700130
Jon Mason74465642013-01-21 15:28:52 -0700131 struct ntb_rx_info __iomem *rx_info;
Jon Mason793c20e2013-01-19 02:02:26 -0700132 struct ntb_rx_info *remote_rx_info;
133
Jon Mason53ca4fe2013-11-26 11:21:50 -0700134 void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data,
135 void *data, int len);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700136 struct list_head tx_free_q;
137 spinlock_t ntb_tx_free_q_lock;
Jon Mason74465642013-01-21 15:28:52 -0700138 void __iomem *tx_mw;
Jon Mason282a2fe2013-02-12 09:52:50 -0700139 dma_addr_t tx_mw_phys;
Jon Mason793c20e2013-01-19 02:02:26 -0700140 unsigned int tx_index;
141 unsigned int tx_max_entry;
Jon Masonef114ed2013-01-19 02:02:18 -0700142 unsigned int tx_max_frame;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700143
Jon Mason53ca4fe2013-11-26 11:21:50 -0700144 void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data,
145 void *data, int len);
Allen Hubbeda2e5ae2015-07-13 08:07:08 -0400146 struct list_head rx_post_q;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700147 struct list_head rx_pend_q;
148 struct list_head rx_free_q;
Allen Hubbeda2e5ae2015-07-13 08:07:08 -0400149 /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */
150 spinlock_t ntb_rx_q_lock;
Jon Mason793c20e2013-01-19 02:02:26 -0700151 void *rx_buff;
152 unsigned int rx_index;
153 unsigned int rx_max_entry;
Jon Masonef114ed2013-01-19 02:02:18 -0700154 unsigned int rx_max_frame;
Jon Mason282a2fe2013-02-12 09:52:50 -0700155 dma_cookie_t last_cookie;
Allen Hubbee26a5842015-04-09 10:33:20 -0400156 struct tasklet_struct rxc_db_work;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700157
Jon Mason53ca4fe2013-11-26 11:21:50 -0700158 void (*event_handler)(void *data, int status);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700159 struct delayed_work link_work;
Jon Mason7b4f2d32013-01-19 02:02:19 -0700160 struct work_struct link_cleanup;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700161
162 struct dentry *debugfs_dir;
163 struct dentry *debugfs_stats;
164
165 /* Stats */
166 u64 rx_bytes;
167 u64 rx_pkts;
168 u64 rx_ring_empty;
169 u64 rx_err_no_buf;
170 u64 rx_err_oflow;
171 u64 rx_err_ver;
Jon Mason282a2fe2013-02-12 09:52:50 -0700172 u64 rx_memcpy;
173 u64 rx_async;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700174 u64 tx_bytes;
175 u64 tx_pkts;
176 u64 tx_ring_full;
Jon Mason282a2fe2013-02-12 09:52:50 -0700177 u64 tx_err_no_buf;
178 u64 tx_memcpy;
179 u64 tx_async;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700180};
181
182struct ntb_transport_mw {
Allen Hubbee26a5842015-04-09 10:33:20 -0400183 phys_addr_t phys_addr;
184 resource_size_t phys_size;
185 resource_size_t xlat_align;
186 resource_size_t xlat_align_size;
187 void __iomem *vbase;
188 size_t xlat_size;
189 size_t buff_size;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700190 void *virt_addr;
191 dma_addr_t dma_addr;
192};
193
194struct ntb_transport_client_dev {
195 struct list_head entry;
Allen Hubbee26a5842015-04-09 10:33:20 -0400196 struct ntb_transport_ctx *nt;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700197 struct device dev;
198};
199
Allen Hubbee26a5842015-04-09 10:33:20 -0400200struct ntb_transport_ctx {
Jon Masonfce8a7b2012-11-16 19:27:12 -0700201 struct list_head entry;
202 struct list_head client_devs;
203
Allen Hubbee26a5842015-04-09 10:33:20 -0400204 struct ntb_dev *ndev;
205
206 struct ntb_transport_mw *mw_vec;
207 struct ntb_transport_qp *qp_vec;
208 unsigned int mw_count;
209 unsigned int qp_count;
210 u64 qp_bitmap;
211 u64 qp_bitmap_free;
212
213 bool link_is_up;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700214 struct delayed_work link_work;
Jon Mason7b4f2d32013-01-19 02:02:19 -0700215 struct work_struct link_cleanup;
Dave Jiangc8650fd2015-07-13 08:07:09 -0400216
217 struct dentry *debugfs_node_dir;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700218};
219
220enum {
Allen Hubbee26a5842015-04-09 10:33:20 -0400221 DESC_DONE_FLAG = BIT(0),
222 LINK_DOWN_FLAG = BIT(1),
Jon Masonfce8a7b2012-11-16 19:27:12 -0700223};
224
225struct ntb_payload_header {
Jon Mason74465642013-01-21 15:28:52 -0700226 unsigned int ver;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700227 unsigned int len;
228 unsigned int flags;
229};
230
231enum {
232 VERSION = 0,
Jon Masonfce8a7b2012-11-16 19:27:12 -0700233 QP_LINKS,
Jon Mason113fc502013-01-30 11:40:52 -0700234 NUM_QPS,
235 NUM_MWS,
236 MW0_SZ_HIGH,
237 MW0_SZ_LOW,
238 MW1_SZ_HIGH,
239 MW1_SZ_LOW,
Jon Masonfce8a7b2012-11-16 19:27:12 -0700240 MAX_SPAD,
241};
242
Allen Hubbee26a5842015-04-09 10:33:20 -0400243#define dev_client_dev(__dev) \
244 container_of((__dev), struct ntb_transport_client_dev, dev)
245
246#define drv_client(__drv) \
247 container_of((__drv), struct ntb_transport_client, driver)
248
249#define QP_TO_MW(nt, qp) ((qp) % nt->mw_count)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700250#define NTB_QP_DEF_NUM_ENTRIES 100
251#define NTB_LINK_DOWN_TIMEOUT 10
252
Allen Hubbee26a5842015-04-09 10:33:20 -0400253static void ntb_transport_rxc_db(unsigned long data);
254static const struct ntb_ctx_ops ntb_transport_ops;
255static struct ntb_client ntb_transport_client;
256
257static int ntb_transport_bus_match(struct device *dev,
258 struct device_driver *drv)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700259{
260 return !strncmp(dev_name(dev), drv->name, strlen(drv->name));
261}
262
Allen Hubbee26a5842015-04-09 10:33:20 -0400263static int ntb_transport_bus_probe(struct device *dev)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700264{
Allen Hubbee26a5842015-04-09 10:33:20 -0400265 const struct ntb_transport_client *client;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700266 int rc = -EINVAL;
267
268 get_device(dev);
Allen Hubbee26a5842015-04-09 10:33:20 -0400269
270 client = drv_client(dev->driver);
271 rc = client->probe(dev);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700272 if (rc)
273 put_device(dev);
274
275 return rc;
276}
277
Allen Hubbee26a5842015-04-09 10:33:20 -0400278static int ntb_transport_bus_remove(struct device *dev)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700279{
Allen Hubbee26a5842015-04-09 10:33:20 -0400280 const struct ntb_transport_client *client;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700281
Allen Hubbee26a5842015-04-09 10:33:20 -0400282 client = drv_client(dev->driver);
283 client->remove(dev);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700284
285 put_device(dev);
286
287 return 0;
288}
289
Allen Hubbee26a5842015-04-09 10:33:20 -0400290static struct bus_type ntb_transport_bus = {
291 .name = "ntb_transport",
292 .match = ntb_transport_bus_match,
293 .probe = ntb_transport_bus_probe,
294 .remove = ntb_transport_bus_remove,
Jon Masonfce8a7b2012-11-16 19:27:12 -0700295};
296
297static LIST_HEAD(ntb_transport_list);
298
Allen Hubbee26a5842015-04-09 10:33:20 -0400299static int ntb_bus_init(struct ntb_transport_ctx *nt)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700300{
Dave Jiang31510002015-07-13 08:07:19 -0400301 list_add_tail(&nt->entry, &ntb_transport_list);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700302 return 0;
303}
304
Allen Hubbee26a5842015-04-09 10:33:20 -0400305static void ntb_bus_remove(struct ntb_transport_ctx *nt)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700306{
307 struct ntb_transport_client_dev *client_dev, *cd;
308
309 list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) {
310 dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n",
311 dev_name(&client_dev->dev));
312 list_del(&client_dev->entry);
313 device_unregister(&client_dev->dev);
314 }
315
316 list_del(&nt->entry);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700317}
318
Allen Hubbee26a5842015-04-09 10:33:20 -0400319static void ntb_transport_client_release(struct device *dev)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700320{
321 struct ntb_transport_client_dev *client_dev;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700322
Allen Hubbee26a5842015-04-09 10:33:20 -0400323 client_dev = dev_client_dev(dev);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700324 kfree(client_dev);
325}
326
327/**
Allen Hubbee26a5842015-04-09 10:33:20 -0400328 * ntb_transport_unregister_client_dev - Unregister NTB client device
Jon Masonfce8a7b2012-11-16 19:27:12 -0700329 * @device_name: Name of NTB client device
330 *
331 * Unregister an NTB client device with the NTB transport layer
332 */
Allen Hubbee26a5842015-04-09 10:33:20 -0400333void ntb_transport_unregister_client_dev(char *device_name)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700334{
335 struct ntb_transport_client_dev *client, *cd;
Allen Hubbee26a5842015-04-09 10:33:20 -0400336 struct ntb_transport_ctx *nt;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700337
338 list_for_each_entry(nt, &ntb_transport_list, entry)
339 list_for_each_entry_safe(client, cd, &nt->client_devs, entry)
340 if (!strncmp(dev_name(&client->dev), device_name,
341 strlen(device_name))) {
342 list_del(&client->entry);
343 device_unregister(&client->dev);
344 }
345}
Allen Hubbee26a5842015-04-09 10:33:20 -0400346EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700347
348/**
Allen Hubbee26a5842015-04-09 10:33:20 -0400349 * ntb_transport_register_client_dev - Register NTB client device
Jon Masonfce8a7b2012-11-16 19:27:12 -0700350 * @device_name: Name of NTB client device
351 *
352 * Register an NTB client device with the NTB transport layer
353 */
Allen Hubbee26a5842015-04-09 10:33:20 -0400354int ntb_transport_register_client_dev(char *device_name)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700355{
356 struct ntb_transport_client_dev *client_dev;
Allen Hubbee26a5842015-04-09 10:33:20 -0400357 struct ntb_transport_ctx *nt;
Allen Hubbe1199aa62015-05-18 06:20:47 -0400358 int node;
Jon Mason8b19d452013-04-26 14:51:57 -0700359 int rc, i = 0;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700360
Jon Mason8222b402013-01-19 02:02:16 -0700361 if (list_empty(&ntb_transport_list))
362 return -ENODEV;
363
Jon Masonfce8a7b2012-11-16 19:27:12 -0700364 list_for_each_entry(nt, &ntb_transport_list, entry) {
365 struct device *dev;
366
Allen Hubbe1199aa62015-05-18 06:20:47 -0400367 node = dev_to_node(&nt->ndev->dev);
368
369 client_dev = kzalloc_node(sizeof(*client_dev),
370 GFP_KERNEL, node);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700371 if (!client_dev) {
372 rc = -ENOMEM;
373 goto err;
374 }
375
376 dev = &client_dev->dev;
377
378 /* setup and register client devices */
Jon Mason8b19d452013-04-26 14:51:57 -0700379 dev_set_name(dev, "%s%d", device_name, i);
Allen Hubbee26a5842015-04-09 10:33:20 -0400380 dev->bus = &ntb_transport_bus;
381 dev->release = ntb_transport_client_release;
382 dev->parent = &nt->ndev->dev;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700383
384 rc = device_register(dev);
385 if (rc) {
386 kfree(client_dev);
387 goto err;
388 }
389
390 list_add_tail(&client_dev->entry, &nt->client_devs);
Jon Mason8b19d452013-04-26 14:51:57 -0700391 i++;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700392 }
393
394 return 0;
395
396err:
Allen Hubbee26a5842015-04-09 10:33:20 -0400397 ntb_transport_unregister_client_dev(device_name);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700398
399 return rc;
400}
Allen Hubbee26a5842015-04-09 10:33:20 -0400401EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700402
403/**
Allen Hubbeec110bc2015-05-07 06:45:21 -0400404 * ntb_transport_register_client - Register NTB client driver
Jon Masonfce8a7b2012-11-16 19:27:12 -0700405 * @drv: NTB client driver to be registered
406 *
407 * Register an NTB client driver with the NTB transport layer
408 *
409 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
410 */
Allen Hubbee26a5842015-04-09 10:33:20 -0400411int ntb_transport_register_client(struct ntb_transport_client *drv)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700412{
Allen Hubbee26a5842015-04-09 10:33:20 -0400413 drv->driver.bus = &ntb_transport_bus;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700414
Jon Mason8222b402013-01-19 02:02:16 -0700415 if (list_empty(&ntb_transport_list))
416 return -ENODEV;
417
Jon Masonfce8a7b2012-11-16 19:27:12 -0700418 return driver_register(&drv->driver);
419}
Allen Hubbeec110bc2015-05-07 06:45:21 -0400420EXPORT_SYMBOL_GPL(ntb_transport_register_client);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700421
422/**
Allen Hubbeec110bc2015-05-07 06:45:21 -0400423 * ntb_transport_unregister_client - Unregister NTB client driver
Jon Masonfce8a7b2012-11-16 19:27:12 -0700424 * @drv: NTB client driver to be unregistered
425 *
426 * Unregister an NTB client driver with the NTB transport layer
427 *
428 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
429 */
Allen Hubbee26a5842015-04-09 10:33:20 -0400430void ntb_transport_unregister_client(struct ntb_transport_client *drv)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700431{
432 driver_unregister(&drv->driver);
433}
Allen Hubbeec110bc2015-05-07 06:45:21 -0400434EXPORT_SYMBOL_GPL(ntb_transport_unregister_client);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700435
Jon Masonfce8a7b2012-11-16 19:27:12 -0700436static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
437 loff_t *offp)
438{
439 struct ntb_transport_qp *qp;
Jon Masond7237e22013-01-19 02:02:25 -0700440 char *buf;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700441 ssize_t ret, out_offset, out_count;
442
Dave Jiang260bee92015-07-13 08:07:11 -0400443 qp = filp->private_data;
444
445 if (!qp || !qp->link_is_up)
446 return 0;
447
Jon Mason282a2fe2013-02-12 09:52:50 -0700448 out_count = 1000;
Jon Masond7237e22013-01-19 02:02:25 -0700449
450 buf = kmalloc(out_count, GFP_KERNEL);
451 if (!buf)
452 return -ENOMEM;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700453
Jon Masonfce8a7b2012-11-16 19:27:12 -0700454 out_offset = 0;
455 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Dave Jiangd98ef992015-07-13 08:07:20 -0400456 "\nNTB QP stats:\n\n");
Jon Masonfce8a7b2012-11-16 19:27:12 -0700457 out_offset += snprintf(buf + out_offset, out_count - out_offset,
458 "rx_bytes - \t%llu\n", qp->rx_bytes);
459 out_offset += snprintf(buf + out_offset, out_count - out_offset,
460 "rx_pkts - \t%llu\n", qp->rx_pkts);
461 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Jon Mason282a2fe2013-02-12 09:52:50 -0700462 "rx_memcpy - \t%llu\n", qp->rx_memcpy);
463 out_offset += snprintf(buf + out_offset, out_count - out_offset,
464 "rx_async - \t%llu\n", qp->rx_async);
465 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Jon Masonfce8a7b2012-11-16 19:27:12 -0700466 "rx_ring_empty - %llu\n", qp->rx_ring_empty);
467 out_offset += snprintf(buf + out_offset, out_count - out_offset,
468 "rx_err_no_buf - %llu\n", qp->rx_err_no_buf);
469 out_offset += snprintf(buf + out_offset, out_count - out_offset,
470 "rx_err_oflow - \t%llu\n", qp->rx_err_oflow);
471 out_offset += snprintf(buf + out_offset, out_count - out_offset,
472 "rx_err_ver - \t%llu\n", qp->rx_err_ver);
473 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Dave Jiangd98ef992015-07-13 08:07:20 -0400474 "rx_buff - \t0x%p\n", qp->rx_buff);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700475 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Jon Mason793c20e2013-01-19 02:02:26 -0700476 "rx_index - \t%u\n", qp->rx_index);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700477 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Dave Jiangd98ef992015-07-13 08:07:20 -0400478 "rx_max_entry - \t%u\n\n", qp->rx_max_entry);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700479
480 out_offset += snprintf(buf + out_offset, out_count - out_offset,
481 "tx_bytes - \t%llu\n", qp->tx_bytes);
482 out_offset += snprintf(buf + out_offset, out_count - out_offset,
483 "tx_pkts - \t%llu\n", qp->tx_pkts);
484 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Jon Mason282a2fe2013-02-12 09:52:50 -0700485 "tx_memcpy - \t%llu\n", qp->tx_memcpy);
486 out_offset += snprintf(buf + out_offset, out_count - out_offset,
487 "tx_async - \t%llu\n", qp->tx_async);
488 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Jon Masonfce8a7b2012-11-16 19:27:12 -0700489 "tx_ring_full - \t%llu\n", qp->tx_ring_full);
490 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Jon Mason282a2fe2013-02-12 09:52:50 -0700491 "tx_err_no_buf - %llu\n", qp->tx_err_no_buf);
492 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Dave Jiangd98ef992015-07-13 08:07:20 -0400493 "tx_mw - \t0x%p\n", qp->tx_mw);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700494 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Dave Jiangd98ef992015-07-13 08:07:20 -0400495 "tx_index (H) - \t%u\n", qp->tx_index);
496 out_offset += snprintf(buf + out_offset, out_count - out_offset,
497 "RRI (T) - \t%u\n",
498 qp->remote_rx_info->entry);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700499 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Jon Mason793c20e2013-01-19 02:02:26 -0700500 "tx_max_entry - \t%u\n", qp->tx_max_entry);
Dave Jiange74bfee2015-07-13 08:07:17 -0400501 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Dave Jiange74bfee2015-07-13 08:07:17 -0400502 "free tx - \t%u\n",
503 ntb_transport_tx_free_entry(qp));
Jon Masonfce8a7b2012-11-16 19:27:12 -0700504
505 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Dave Jiangd98ef992015-07-13 08:07:20 -0400506 "\n");
507 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Dave Jiang569410ca2015-07-13 08:07:22 -0400508 "Using TX DMA - \t%s\n",
509 qp->tx_dma_chan ? "Yes" : "No");
510 out_offset += snprintf(buf + out_offset, out_count - out_offset,
511 "Using RX DMA - \t%s\n",
512 qp->rx_dma_chan ? "Yes" : "No");
Dave Jiangd98ef992015-07-13 08:07:20 -0400513 out_offset += snprintf(buf + out_offset, out_count - out_offset,
514 "QP Link - \t%s\n",
Allen Hubbee26a5842015-04-09 10:33:20 -0400515 qp->link_is_up ? "Up" : "Down");
Dave Jiangd98ef992015-07-13 08:07:20 -0400516 out_offset += snprintf(buf + out_offset, out_count - out_offset,
517 "\n");
518
Jon Masond7237e22013-01-19 02:02:25 -0700519 if (out_offset > out_count)
520 out_offset = out_count;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700521
522 ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
Jon Masond7237e22013-01-19 02:02:25 -0700523 kfree(buf);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700524 return ret;
525}
526
527static const struct file_operations ntb_qp_debugfs_stats = {
528 .owner = THIS_MODULE,
Jon Masond66d7ac2013-01-19 02:02:20 -0700529 .open = simple_open,
Jon Masonfce8a7b2012-11-16 19:27:12 -0700530 .read = debugfs_read,
531};
532
533static void ntb_list_add(spinlock_t *lock, struct list_head *entry,
534 struct list_head *list)
535{
536 unsigned long flags;
537
538 spin_lock_irqsave(lock, flags);
539 list_add_tail(entry, list);
540 spin_unlock_irqrestore(lock, flags);
541}
542
543static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock,
Jon Mason53ca4fe2013-11-26 11:21:50 -0700544 struct list_head *list)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700545{
546 struct ntb_queue_entry *entry;
547 unsigned long flags;
548
549 spin_lock_irqsave(lock, flags);
550 if (list_empty(list)) {
551 entry = NULL;
552 goto out;
553 }
554 entry = list_first_entry(list, struct ntb_queue_entry, entry);
555 list_del(&entry->entry);
Dave Jiange74bfee2015-07-13 08:07:17 -0400556
Jon Masonfce8a7b2012-11-16 19:27:12 -0700557out:
558 spin_unlock_irqrestore(lock, flags);
559
560 return entry;
561}
562
Allen Hubbeda2e5ae2015-07-13 08:07:08 -0400563static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock,
564 struct list_head *list,
565 struct list_head *to_list)
566{
567 struct ntb_queue_entry *entry;
568 unsigned long flags;
569
570 spin_lock_irqsave(lock, flags);
571
572 if (list_empty(list)) {
573 entry = NULL;
574 } else {
575 entry = list_first_entry(list, struct ntb_queue_entry, entry);
576 list_move_tail(&entry->entry, to_list);
577 }
578
579 spin_unlock_irqrestore(lock, flags);
580
581 return entry;
582}
583
Allen Hubbee26a5842015-04-09 10:33:20 -0400584static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt,
585 unsigned int qp_num)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700586{
Allen Hubbee26a5842015-04-09 10:33:20 -0400587 struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
588 struct ntb_transport_mw *mw;
Jon Masonef114ed2013-01-19 02:02:18 -0700589 unsigned int rx_size, num_qps_mw;
Allen Hubbee26a5842015-04-09 10:33:20 -0400590 unsigned int mw_num, mw_count, qp_count;
Jon Mason793c20e2013-01-19 02:02:26 -0700591 unsigned int i;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700592
Allen Hubbee26a5842015-04-09 10:33:20 -0400593 mw_count = nt->mw_count;
594 qp_count = nt->qp_count;
Jon Mason948d3a62013-04-18 17:07:36 -0700595
Allen Hubbee26a5842015-04-09 10:33:20 -0400596 mw_num = QP_TO_MW(nt, qp_num);
597 mw = &nt->mw_vec[mw_num];
Jon Masonfce8a7b2012-11-16 19:27:12 -0700598
Allen Hubbee26a5842015-04-09 10:33:20 -0400599 if (!mw->virt_addr)
600 return -ENOMEM;
601
602 if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count)
603 num_qps_mw = qp_count / mw_count + 1;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700604 else
Allen Hubbee26a5842015-04-09 10:33:20 -0400605 num_qps_mw = qp_count / mw_count;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700606
Allen Hubbee26a5842015-04-09 10:33:20 -0400607 rx_size = (unsigned int)mw->xlat_size / num_qps_mw;
Jon Masonc92ba3c2015-10-04 22:54:22 -0400608 qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count);
Jon Mason793c20e2013-01-19 02:02:26 -0700609 rx_size -= sizeof(struct ntb_rx_info);
610
Jon Mason282a2fe2013-02-12 09:52:50 -0700611 qp->remote_rx_info = qp->rx_buff + rx_size;
612
Jon Masonc9d534c2013-02-01 15:45:16 -0700613 /* Due to housekeeping, there must be atleast 2 buffs */
614 qp->rx_max_frame = min(transport_mtu, rx_size / 2);
Jon Mason793c20e2013-01-19 02:02:26 -0700615 qp->rx_max_entry = rx_size / qp->rx_max_frame;
616 qp->rx_index = 0;
617
Jon Masonc9d534c2013-02-01 15:45:16 -0700618 qp->remote_rx_info->entry = qp->rx_max_entry - 1;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700619
Jon Masonef114ed2013-01-19 02:02:18 -0700620 /* setup the hdr offsets with 0's */
Jon Mason793c20e2013-01-19 02:02:26 -0700621 for (i = 0; i < qp->rx_max_entry; i++) {
Allen Hubbee26a5842015-04-09 10:33:20 -0400622 void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) -
623 sizeof(struct ntb_payload_header));
Jon Masonef114ed2013-01-19 02:02:18 -0700624 memset(offset, 0, sizeof(struct ntb_payload_header));
Jon Mason793c20e2013-01-19 02:02:26 -0700625 }
Jon Masonfce8a7b2012-11-16 19:27:12 -0700626
627 qp->rx_pkts = 0;
628 qp->tx_pkts = 0;
Jon Mason90f9e932013-02-01 15:34:35 -0700629 qp->tx_index = 0;
Allen Hubbee26a5842015-04-09 10:33:20 -0400630
631 return 0;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700632}
633
Allen Hubbee26a5842015-04-09 10:33:20 -0400634static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw)
Jon Mason113fc502013-01-30 11:40:52 -0700635{
Allen Hubbee26a5842015-04-09 10:33:20 -0400636 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
637 struct pci_dev *pdev = nt->ndev->pdev;
Jon Mason113fc502013-01-30 11:40:52 -0700638
639 if (!mw->virt_addr)
640 return;
641
Allen Hubbee26a5842015-04-09 10:33:20 -0400642 ntb_mw_clear_trans(nt->ndev, num_mw);
643 dma_free_coherent(&pdev->dev, mw->buff_size,
644 mw->virt_addr, mw->dma_addr);
645 mw->xlat_size = 0;
646 mw->buff_size = 0;
Jon Mason113fc502013-01-30 11:40:52 -0700647 mw->virt_addr = NULL;
648}
649
Allen Hubbee26a5842015-04-09 10:33:20 -0400650static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw,
Allen Hubbe8c9edf62015-07-13 08:07:13 -0400651 resource_size_t size)
Jon Masonb77b2632013-02-01 15:25:37 -0700652{
Allen Hubbee26a5842015-04-09 10:33:20 -0400653 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
654 struct pci_dev *pdev = nt->ndev->pdev;
Allen Hubbe8c9edf62015-07-13 08:07:13 -0400655 size_t xlat_size, buff_size;
Allen Hubbee26a5842015-04-09 10:33:20 -0400656 int rc;
657
Allen Hubbe8c9edf62015-07-13 08:07:13 -0400658 if (!size)
659 return -EINVAL;
660
Allen Hubbee26a5842015-04-09 10:33:20 -0400661 xlat_size = round_up(size, mw->xlat_align_size);
662 buff_size = round_up(size, mw->xlat_align);
Jon Masonb77b2632013-02-01 15:25:37 -0700663
664 /* No need to re-setup */
Allen Hubbee26a5842015-04-09 10:33:20 -0400665 if (mw->xlat_size == xlat_size)
Jon Masonb77b2632013-02-01 15:25:37 -0700666 return 0;
667
Allen Hubbee26a5842015-04-09 10:33:20 -0400668 if (mw->buff_size)
Jon Masonb77b2632013-02-01 15:25:37 -0700669 ntb_free_mw(nt, num_mw);
670
Allen Hubbee26a5842015-04-09 10:33:20 -0400671 /* Alloc memory for receiving data. Must be aligned */
672 mw->xlat_size = xlat_size;
673 mw->buff_size = buff_size;
Jon Masonb77b2632013-02-01 15:25:37 -0700674
Allen Hubbee26a5842015-04-09 10:33:20 -0400675 mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size,
676 &mw->dma_addr, GFP_KERNEL);
Jon Masonb77b2632013-02-01 15:25:37 -0700677 if (!mw->virt_addr) {
Allen Hubbee26a5842015-04-09 10:33:20 -0400678 mw->xlat_size = 0;
679 mw->buff_size = 0;
Allen Hubbe8c9edf62015-07-13 08:07:13 -0400680 dev_err(&pdev->dev, "Unable to alloc MW buff of size %zu\n",
Allen Hubbee26a5842015-04-09 10:33:20 -0400681 buff_size);
Jon Masonb77b2632013-02-01 15:25:37 -0700682 return -ENOMEM;
683 }
684
Dave Jiang3cc5ba12014-08-28 13:53:02 -0700685 /*
686 * we must ensure that the memory address allocated is BAR size
687 * aligned in order for the XLAT register to take the value. This
688 * is a requirement of the hardware. It is recommended to setup CMA
689 * for BAR sizes equal or greater than 4MB.
690 */
Allen Hubbee26a5842015-04-09 10:33:20 -0400691 if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) {
692 dev_err(&pdev->dev, "DMA memory %pad is not aligned\n",
Dave Jiang3cc5ba12014-08-28 13:53:02 -0700693 &mw->dma_addr);
694 ntb_free_mw(nt, num_mw);
695 return -ENOMEM;
696 }
697
Jon Masonb77b2632013-02-01 15:25:37 -0700698 /* Notify HW the memory location of the receive buffer */
Allen Hubbee26a5842015-04-09 10:33:20 -0400699 rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size);
700 if (rc) {
701 dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw);
702 ntb_free_mw(nt, num_mw);
703 return -EIO;
704 }
Jon Masonb77b2632013-02-01 15:25:37 -0700705
706 return 0;
707}
708
Allen Hubbe2849b5d72015-05-12 08:09:15 -0400709static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
710{
711 qp->link_is_up = false;
712
713 qp->tx_index = 0;
714 qp->rx_index = 0;
715 qp->rx_bytes = 0;
716 qp->rx_pkts = 0;
717 qp->rx_ring_empty = 0;
718 qp->rx_err_no_buf = 0;
719 qp->rx_err_oflow = 0;
720 qp->rx_err_ver = 0;
721 qp->rx_memcpy = 0;
722 qp->rx_async = 0;
723 qp->tx_bytes = 0;
724 qp->tx_pkts = 0;
725 qp->tx_ring_full = 0;
726 qp->tx_err_no_buf = 0;
727 qp->tx_memcpy = 0;
728 qp->tx_async = 0;
729}
730
Jon Masonfca4d512013-09-09 13:39:55 -0700731static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700732{
Allen Hubbee26a5842015-04-09 10:33:20 -0400733 struct ntb_transport_ctx *nt = qp->transport;
734 struct pci_dev *pdev = nt->ndev->pdev;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700735
Allen Hubbee22e0b92015-05-12 06:55:44 -0400736 dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num);
Allen Hubbe2849b5d72015-05-12 08:09:15 -0400737
738 cancel_delayed_work_sync(&qp->link_work);
739 ntb_qp_link_down_reset(qp);
Allen Hubbee26a5842015-04-09 10:33:20 -0400740
741 if (qp->event_handler)
742 qp->event_handler(qp->cb_data, qp->link_is_up);
Jon Masonfca4d512013-09-09 13:39:55 -0700743}
744
745static void ntb_qp_link_cleanup_work(struct work_struct *work)
746{
747 struct ntb_transport_qp *qp = container_of(work,
748 struct ntb_transport_qp,
749 link_cleanup);
Allen Hubbee26a5842015-04-09 10:33:20 -0400750 struct ntb_transport_ctx *nt = qp->transport;
Jon Masonfca4d512013-09-09 13:39:55 -0700751
752 ntb_qp_link_cleanup(qp);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700753
Allen Hubbee26a5842015-04-09 10:33:20 -0400754 if (nt->link_is_up)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700755 schedule_delayed_work(&qp->link_work,
756 msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
757}
758
Jon Mason7b4f2d32013-01-19 02:02:19 -0700759static void ntb_qp_link_down(struct ntb_transport_qp *qp)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700760{
Jon Mason7b4f2d32013-01-19 02:02:19 -0700761 schedule_work(&qp->link_cleanup);
762}
763
Allen Hubbee26a5842015-04-09 10:33:20 -0400764static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt)
Jon Mason7b4f2d32013-01-19 02:02:19 -0700765{
Allen Hubbee26a5842015-04-09 10:33:20 -0400766 struct ntb_transport_qp *qp;
767 u64 qp_bitmap_alloc;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700768 int i;
769
Allen Hubbee26a5842015-04-09 10:33:20 -0400770 qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free;
Jon Masonfca4d512013-09-09 13:39:55 -0700771
Allen Hubbee26a5842015-04-09 10:33:20 -0400772 /* Pass along the info to any clients */
773 for (i = 0; i < nt->qp_count; i++)
774 if (qp_bitmap_alloc & BIT_ULL(i)) {
775 qp = &nt->qp_vec[i];
776 ntb_qp_link_cleanup(qp);
777 cancel_work_sync(&qp->link_cleanup);
778 cancel_delayed_work_sync(&qp->link_work);
779 }
780
781 if (!nt->link_is_up)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700782 cancel_delayed_work_sync(&nt->link_work);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700783
Jon Masonfce8a7b2012-11-16 19:27:12 -0700784 /* The scratchpad registers keep the values if the remote side
785 * goes down, blast them now to give them a sane value the next
786 * time they are accessed
787 */
788 for (i = 0; i < MAX_SPAD; i++)
Allen Hubbee26a5842015-04-09 10:33:20 -0400789 ntb_spad_write(nt->ndev, i, 0);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700790}
791
Jon Masonfca4d512013-09-09 13:39:55 -0700792static void ntb_transport_link_cleanup_work(struct work_struct *work)
793{
Allen Hubbee26a5842015-04-09 10:33:20 -0400794 struct ntb_transport_ctx *nt =
795 container_of(work, struct ntb_transport_ctx, link_cleanup);
Jon Masonfca4d512013-09-09 13:39:55 -0700796
797 ntb_transport_link_cleanup(nt);
798}
799
Allen Hubbee26a5842015-04-09 10:33:20 -0400800static void ntb_transport_event_callback(void *data)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700801{
Allen Hubbee26a5842015-04-09 10:33:20 -0400802 struct ntb_transport_ctx *nt = data;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700803
Allen Hubbee26a5842015-04-09 10:33:20 -0400804 if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700805 schedule_delayed_work(&nt->link_work, 0);
Allen Hubbee26a5842015-04-09 10:33:20 -0400806 else
Jon Mason7b4f2d32013-01-19 02:02:19 -0700807 schedule_work(&nt->link_cleanup);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700808}
809
810static void ntb_transport_link_work(struct work_struct *work)
811{
Allen Hubbee26a5842015-04-09 10:33:20 -0400812 struct ntb_transport_ctx *nt =
813 container_of(work, struct ntb_transport_ctx, link_work.work);
814 struct ntb_dev *ndev = nt->ndev;
815 struct pci_dev *pdev = ndev->pdev;
816 resource_size_t size;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700817 u32 val;
Allen Hubbee26a5842015-04-09 10:33:20 -0400818 int rc, i, spad;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700819
Jon Mason113fc502013-01-30 11:40:52 -0700820 /* send the local info, in the opposite order of the way we read it */
Allen Hubbee26a5842015-04-09 10:33:20 -0400821 for (i = 0; i < nt->mw_count; i++) {
822 size = nt->mw_vec[i].phys_size;
Jon Mason113fc502013-01-30 11:40:52 -0700823
Allen Hubbee26a5842015-04-09 10:33:20 -0400824 if (max_mw_size && size > max_mw_size)
825 size = max_mw_size;
826
827 spad = MW0_SZ_HIGH + (i * 2);
Arnd Bergmannfdcb4b22015-10-07 09:59:34 +0200828 ntb_peer_spad_write(ndev, spad, upper_32_bits(size));
Allen Hubbee26a5842015-04-09 10:33:20 -0400829
830 spad = MW0_SZ_LOW + (i * 2);
Arnd Bergmannfdcb4b22015-10-07 09:59:34 +0200831 ntb_peer_spad_write(ndev, spad, lower_32_bits(size));
Jon Masonfce8a7b2012-11-16 19:27:12 -0700832 }
833
Allen Hubbee26a5842015-04-09 10:33:20 -0400834 ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700835
Allen Hubbee26a5842015-04-09 10:33:20 -0400836 ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700837
Allen Hubbee26a5842015-04-09 10:33:20 -0400838 ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700839
840 /* Query the remote side for its info */
Dave Jiang0f69a7d2015-06-02 03:45:07 -0400841 val = ntb_spad_read(ndev, VERSION);
Allen Hubbee26a5842015-04-09 10:33:20 -0400842 dev_dbg(&pdev->dev, "Remote version = %d\n", val);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700843 if (val != NTB_TRANSPORT_VERSION)
844 goto out;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700845
Dave Jiang0f69a7d2015-06-02 03:45:07 -0400846 val = ntb_spad_read(ndev, NUM_QPS);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700847 dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val);
Allen Hubbee26a5842015-04-09 10:33:20 -0400848 if (val != nt->qp_count)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700849 goto out;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700850
Dave Jiang0f69a7d2015-06-02 03:45:07 -0400851 val = ntb_spad_read(ndev, NUM_MWS);
Jon Mason113fc502013-01-30 11:40:52 -0700852 dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val);
Allen Hubbee26a5842015-04-09 10:33:20 -0400853 if (val != nt->mw_count)
854 goto out;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700855
Allen Hubbee26a5842015-04-09 10:33:20 -0400856 for (i = 0; i < nt->mw_count; i++) {
Jon Mason113fc502013-01-30 11:40:52 -0700857 u64 val64;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700858
Dave Jiang0f69a7d2015-06-02 03:45:07 -0400859 val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2));
Allen Hubbee26a5842015-04-09 10:33:20 -0400860 val64 = (u64)val << 32;
Jon Mason113fc502013-01-30 11:40:52 -0700861
Dave Jiang0f69a7d2015-06-02 03:45:07 -0400862 val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2));
Jon Mason113fc502013-01-30 11:40:52 -0700863 val64 |= val;
864
Allen Hubbee26a5842015-04-09 10:33:20 -0400865 dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64);
Jon Mason113fc502013-01-30 11:40:52 -0700866
867 rc = ntb_set_mw(nt, i, val64);
868 if (rc)
869 goto out1;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700870 }
871
Allen Hubbee26a5842015-04-09 10:33:20 -0400872 nt->link_is_up = true;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700873
Allen Hubbee26a5842015-04-09 10:33:20 -0400874 for (i = 0; i < nt->qp_count; i++) {
875 struct ntb_transport_qp *qp = &nt->qp_vec[i];
Jon Masonfce8a7b2012-11-16 19:27:12 -0700876
877 ntb_transport_setup_qp_mw(nt, i);
878
Allen Hubbee26a5842015-04-09 10:33:20 -0400879 if (qp->client_ready)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700880 schedule_delayed_work(&qp->link_work, 0);
881 }
882
883 return;
884
Jon Mason113fc502013-01-30 11:40:52 -0700885out1:
Allen Hubbee26a5842015-04-09 10:33:20 -0400886 for (i = 0; i < nt->mw_count; i++)
Jon Mason113fc502013-01-30 11:40:52 -0700887 ntb_free_mw(nt, i);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700888out:
Allen Hubbee26a5842015-04-09 10:33:20 -0400889 if (ntb_link_is_up(ndev, NULL, NULL) == 1)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700890 schedule_delayed_work(&nt->link_work,
891 msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
892}
893
894static void ntb_qp_link_work(struct work_struct *work)
895{
896 struct ntb_transport_qp *qp = container_of(work,
897 struct ntb_transport_qp,
898 link_work.work);
Allen Hubbee26a5842015-04-09 10:33:20 -0400899 struct pci_dev *pdev = qp->ndev->pdev;
900 struct ntb_transport_ctx *nt = qp->transport;
901 int val;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700902
Allen Hubbee26a5842015-04-09 10:33:20 -0400903 WARN_ON(!nt->link_is_up);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700904
Allen Hubbee26a5842015-04-09 10:33:20 -0400905 val = ntb_spad_read(nt->ndev, QP_LINKS);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700906
Allen Hubbee26a5842015-04-09 10:33:20 -0400907 ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num));
Jon Masonfce8a7b2012-11-16 19:27:12 -0700908
909 /* query remote spad for qp ready bits */
Allen Hubbee26a5842015-04-09 10:33:20 -0400910 ntb_peer_spad_read(nt->ndev, QP_LINKS);
Allen Hubbe28762282015-05-11 10:08:26 -0400911 dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700912
913 /* See if the remote side is up */
Allen Hubbee26a5842015-04-09 10:33:20 -0400914 if (val & BIT(qp->qp_num)) {
Jon Masonfce8a7b2012-11-16 19:27:12 -0700915 dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num);
Allen Hubbee26a5842015-04-09 10:33:20 -0400916 qp->link_is_up = true;
917
Jon Masonfce8a7b2012-11-16 19:27:12 -0700918 if (qp->event_handler)
Allen Hubbee26a5842015-04-09 10:33:20 -0400919 qp->event_handler(qp->cb_data, qp->link_is_up);
Allen Hubbe8b5a22d2015-07-13 08:07:12 -0400920
921 tasklet_schedule(&qp->rxc_db_work);
Allen Hubbee26a5842015-04-09 10:33:20 -0400922 } else if (nt->link_is_up)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700923 schedule_delayed_work(&qp->link_work,
924 msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
925}
926
Allen Hubbee26a5842015-04-09 10:33:20 -0400927static int ntb_transport_init_queue(struct ntb_transport_ctx *nt,
Jon Mason53ca4fe2013-11-26 11:21:50 -0700928 unsigned int qp_num)
Jon Masonfce8a7b2012-11-16 19:27:12 -0700929{
930 struct ntb_transport_qp *qp;
Allen Hubbee26a5842015-04-09 10:33:20 -0400931 phys_addr_t mw_base;
932 resource_size_t mw_size;
Jon Masonef114ed2013-01-19 02:02:18 -0700933 unsigned int num_qps_mw, tx_size;
Allen Hubbee26a5842015-04-09 10:33:20 -0400934 unsigned int mw_num, mw_count, qp_count;
Jon Mason282a2fe2013-02-12 09:52:50 -0700935 u64 qp_offset;
Jon Mason948d3a62013-04-18 17:07:36 -0700936
Allen Hubbee26a5842015-04-09 10:33:20 -0400937 mw_count = nt->mw_count;
938 qp_count = nt->qp_count;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700939
Allen Hubbee26a5842015-04-09 10:33:20 -0400940 mw_num = QP_TO_MW(nt, qp_num);
Allen Hubbee26a5842015-04-09 10:33:20 -0400941
942 qp = &nt->qp_vec[qp_num];
Jon Masonfce8a7b2012-11-16 19:27:12 -0700943 qp->qp_num = qp_num;
944 qp->transport = nt;
945 qp->ndev = nt->ndev;
Allen Hubbee26a5842015-04-09 10:33:20 -0400946 qp->client_ready = false;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700947 qp->event_handler = NULL;
Allen Hubbe2849b5d72015-05-12 08:09:15 -0400948 ntb_qp_link_down_reset(qp);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700949
Allen Hubbee26a5842015-04-09 10:33:20 -0400950 if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count)
951 num_qps_mw = qp_count / mw_count + 1;
Jon Masonef114ed2013-01-19 02:02:18 -0700952 else
Allen Hubbee26a5842015-04-09 10:33:20 -0400953 num_qps_mw = qp_count / mw_count;
Jon Masonef114ed2013-01-19 02:02:18 -0700954
Allen Hubbee26a5842015-04-09 10:33:20 -0400955 mw_base = nt->mw_vec[mw_num].phys_addr;
956 mw_size = nt->mw_vec[mw_num].phys_size;
957
958 tx_size = (unsigned int)mw_size / num_qps_mw;
Jon Masonc92ba3c2015-10-04 22:54:22 -0400959 qp_offset = tx_size * (qp_num / mw_count);
Allen Hubbee26a5842015-04-09 10:33:20 -0400960
961 qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset;
Jon Mason282a2fe2013-02-12 09:52:50 -0700962 if (!qp->tx_mw)
963 return -EINVAL;
Jon Mason793c20e2013-01-19 02:02:26 -0700964
Allen Hubbee26a5842015-04-09 10:33:20 -0400965 qp->tx_mw_phys = mw_base + qp_offset;
Jon Mason282a2fe2013-02-12 09:52:50 -0700966 if (!qp->tx_mw_phys)
967 return -EINVAL;
968
969 tx_size -= sizeof(struct ntb_rx_info);
970 qp->rx_info = qp->tx_mw + tx_size;
971
Jon Masonc9d534c2013-02-01 15:45:16 -0700972 /* Due to housekeeping, there must be atleast 2 buffs */
973 qp->tx_max_frame = min(transport_mtu, tx_size / 2);
Jon Mason793c20e2013-01-19 02:02:26 -0700974 qp->tx_max_entry = tx_size / qp->tx_max_frame;
Jon Masonef114ed2013-01-19 02:02:18 -0700975
Dave Jiangc8650fd2015-07-13 08:07:09 -0400976 if (nt->debugfs_node_dir) {
Jon Masonfce8a7b2012-11-16 19:27:12 -0700977 char debugfs_name[4];
978
979 snprintf(debugfs_name, 4, "qp%d", qp_num);
980 qp->debugfs_dir = debugfs_create_dir(debugfs_name,
Dave Jiangc8650fd2015-07-13 08:07:09 -0400981 nt->debugfs_node_dir);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700982
983 qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR,
984 qp->debugfs_dir, qp,
985 &ntb_qp_debugfs_stats);
Allen Hubbee26a5842015-04-09 10:33:20 -0400986 } else {
987 qp->debugfs_dir = NULL;
988 qp->debugfs_stats = NULL;
Jon Masonfce8a7b2012-11-16 19:27:12 -0700989 }
990
991 INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work);
Jon Masonfca4d512013-09-09 13:39:55 -0700992 INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700993
Allen Hubbeda2e5ae2015-07-13 08:07:08 -0400994 spin_lock_init(&qp->ntb_rx_q_lock);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700995 spin_lock_init(&qp->ntb_tx_free_q_lock);
996
Allen Hubbeda2e5ae2015-07-13 08:07:08 -0400997 INIT_LIST_HEAD(&qp->rx_post_q);
Jon Masonfce8a7b2012-11-16 19:27:12 -0700998 INIT_LIST_HEAD(&qp->rx_pend_q);
999 INIT_LIST_HEAD(&qp->rx_free_q);
1000 INIT_LIST_HEAD(&qp->tx_free_q);
Jon Mason282a2fe2013-02-12 09:52:50 -07001001
Allen Hubbee26a5842015-04-09 10:33:20 -04001002 tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db,
1003 (unsigned long)qp);
1004
Jon Mason282a2fe2013-02-12 09:52:50 -07001005 return 0;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001006}
1007
Allen Hubbee26a5842015-04-09 10:33:20 -04001008static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001009{
Allen Hubbee26a5842015-04-09 10:33:20 -04001010 struct ntb_transport_ctx *nt;
1011 struct ntb_transport_mw *mw;
1012 unsigned int mw_count, qp_count;
1013 u64 qp_bitmap;
Allen Hubbe1199aa62015-05-18 06:20:47 -04001014 int node;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001015 int rc, i;
1016
Allen Hubbee26a5842015-04-09 10:33:20 -04001017 if (ntb_db_is_unsafe(ndev))
1018 dev_dbg(&ndev->dev,
1019 "doorbell is unsafe, proceed anyway...\n");
1020 if (ntb_spad_is_unsafe(ndev))
1021 dev_dbg(&ndev->dev,
1022 "scratchpad is unsafe, proceed anyway...\n");
1023
Allen Hubbe1199aa62015-05-18 06:20:47 -04001024 node = dev_to_node(&ndev->dev);
1025
1026 nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001027 if (!nt)
1028 return -ENOMEM;
1029
Allen Hubbee26a5842015-04-09 10:33:20 -04001030 nt->ndev = ndev;
1031
1032 mw_count = ntb_mw_count(ndev);
1033
1034 nt->mw_count = mw_count;
1035
Allen Hubbe1199aa62015-05-18 06:20:47 -04001036 nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec),
1037 GFP_KERNEL, node);
Allen Hubbee26a5842015-04-09 10:33:20 -04001038 if (!nt->mw_vec) {
1039 rc = -ENOMEM;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001040 goto err;
1041 }
1042
Allen Hubbee26a5842015-04-09 10:33:20 -04001043 for (i = 0; i < mw_count; i++) {
1044 mw = &nt->mw_vec[i];
1045
1046 rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size,
1047 &mw->xlat_align, &mw->xlat_align_size);
1048 if (rc)
1049 goto err1;
1050
Dave Jiang06917f72015-05-19 16:45:46 -04001051 mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size);
Allen Hubbee26a5842015-04-09 10:33:20 -04001052 if (!mw->vbase) {
1053 rc = -ENOMEM;
1054 goto err1;
1055 }
1056
1057 mw->buff_size = 0;
1058 mw->xlat_size = 0;
1059 mw->virt_addr = NULL;
1060 mw->dma_addr = 0;
Jon Mason948d3a62013-04-18 17:07:36 -07001061 }
1062
Allen Hubbee26a5842015-04-09 10:33:20 -04001063 qp_bitmap = ntb_db_valid_mask(ndev);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001064
Allen Hubbee26a5842015-04-09 10:33:20 -04001065 qp_count = ilog2(qp_bitmap);
1066 if (max_num_clients && max_num_clients < qp_count)
1067 qp_count = max_num_clients;
1068 else if (mw_count < qp_count)
1069 qp_count = mw_count;
1070
1071 qp_bitmap &= BIT_ULL(qp_count) - 1;
1072
1073 nt->qp_count = qp_count;
1074 nt->qp_bitmap = qp_bitmap;
1075 nt->qp_bitmap_free = qp_bitmap;
1076
Allen Hubbe1199aa62015-05-18 06:20:47 -04001077 nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec),
1078 GFP_KERNEL, node);
Allen Hubbee26a5842015-04-09 10:33:20 -04001079 if (!nt->qp_vec) {
Jon Masonfce8a7b2012-11-16 19:27:12 -07001080 rc = -ENOMEM;
Sudip Mukherjeed4adee02015-10-03 13:39:41 +05301081 goto err1;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001082 }
1083
Dave Jiangc8650fd2015-07-13 08:07:09 -04001084 if (nt_debugfs_dir) {
1085 nt->debugfs_node_dir =
1086 debugfs_create_dir(pci_name(ndev->pdev),
1087 nt_debugfs_dir);
1088 }
1089
Allen Hubbee26a5842015-04-09 10:33:20 -04001090 for (i = 0; i < qp_count; i++) {
Jon Mason282a2fe2013-02-12 09:52:50 -07001091 rc = ntb_transport_init_queue(nt, i);
1092 if (rc)
Sudip Mukherjeed4adee02015-10-03 13:39:41 +05301093 goto err2;
Jon Mason282a2fe2013-02-12 09:52:50 -07001094 }
Jon Masonfce8a7b2012-11-16 19:27:12 -07001095
1096 INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work);
Jon Masonfca4d512013-09-09 13:39:55 -07001097 INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001098
Allen Hubbee26a5842015-04-09 10:33:20 -04001099 rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001100 if (rc)
Sudip Mukherjeed4adee02015-10-03 13:39:41 +05301101 goto err2;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001102
1103 INIT_LIST_HEAD(&nt->client_devs);
1104 rc = ntb_bus_init(nt);
1105 if (rc)
Sudip Mukherjeed4adee02015-10-03 13:39:41 +05301106 goto err3;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001107
Allen Hubbee26a5842015-04-09 10:33:20 -04001108 nt->link_is_up = false;
1109 ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
1110 ntb_link_event(ndev);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001111
1112 return 0;
1113
Jon Mason948d3a62013-04-18 17:07:36 -07001114err3:
Sudip Mukherjeed4adee02015-10-03 13:39:41 +05301115 ntb_clear_ctx(ndev);
Jon Mason948d3a62013-04-18 17:07:36 -07001116err2:
Sudip Mukherjeed4adee02015-10-03 13:39:41 +05301117 kfree(nt->qp_vec);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001118err1:
Allen Hubbee26a5842015-04-09 10:33:20 -04001119 while (i--) {
1120 mw = &nt->mw_vec[i];
1121 iounmap(mw->vbase);
1122 }
Sudip Mukherjeed4adee02015-10-03 13:39:41 +05301123 kfree(nt->mw_vec);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001124err:
Jon Masonfce8a7b2012-11-16 19:27:12 -07001125 kfree(nt);
1126 return rc;
1127}
1128
Allen Hubbee26a5842015-04-09 10:33:20 -04001129static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001130{
Allen Hubbee26a5842015-04-09 10:33:20 -04001131 struct ntb_transport_ctx *nt = ndev->ctx;
1132 struct ntb_transport_qp *qp;
1133 u64 qp_bitmap_alloc;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001134 int i;
1135
Jon Masonfca4d512013-09-09 13:39:55 -07001136 ntb_transport_link_cleanup(nt);
Allen Hubbee26a5842015-04-09 10:33:20 -04001137 cancel_work_sync(&nt->link_cleanup);
1138 cancel_delayed_work_sync(&nt->link_work);
1139
1140 qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001141
1142 /* verify that all the qp's are freed */
Allen Hubbee26a5842015-04-09 10:33:20 -04001143 for (i = 0; i < nt->qp_count; i++) {
1144 qp = &nt->qp_vec[i];
1145 if (qp_bitmap_alloc & BIT_ULL(i))
1146 ntb_transport_free_queue(qp);
1147 debugfs_remove_recursive(qp->debugfs_dir);
Jon Mason1517a3f2013-07-30 15:58:49 -07001148 }
Jon Masonfce8a7b2012-11-16 19:27:12 -07001149
Allen Hubbee26a5842015-04-09 10:33:20 -04001150 ntb_link_disable(ndev);
1151 ntb_clear_ctx(ndev);
1152
Jon Masonfce8a7b2012-11-16 19:27:12 -07001153 ntb_bus_remove(nt);
1154
Allen Hubbee26a5842015-04-09 10:33:20 -04001155 for (i = nt->mw_count; i--; ) {
Jon Mason113fc502013-01-30 11:40:52 -07001156 ntb_free_mw(nt, i);
Allen Hubbee26a5842015-04-09 10:33:20 -04001157 iounmap(nt->mw_vec[i].vbase);
1158 }
Jon Masonfce8a7b2012-11-16 19:27:12 -07001159
Allen Hubbee26a5842015-04-09 10:33:20 -04001160 kfree(nt->qp_vec);
1161 kfree(nt->mw_vec);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001162 kfree(nt);
1163}
1164
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001165static void ntb_complete_rxc(struct ntb_transport_qp *qp)
1166{
1167 struct ntb_queue_entry *entry;
1168 void *cb_data;
1169 unsigned int len;
1170 unsigned long irqflags;
1171
1172 spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags);
1173
1174 while (!list_empty(&qp->rx_post_q)) {
1175 entry = list_first_entry(&qp->rx_post_q,
1176 struct ntb_queue_entry, entry);
1177 if (!(entry->flags & DESC_DONE_FLAG))
1178 break;
1179
1180 entry->rx_hdr->flags = 0;
1181 iowrite32(entry->index, &qp->rx_info->entry);
1182
1183 cb_data = entry->cb_data;
1184 len = entry->len;
1185
1186 list_move_tail(&entry->entry, &qp->rx_free_q);
1187
1188 spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags);
1189
1190 if (qp->rx_handler && qp->client_ready)
1191 qp->rx_handler(qp, qp->cb_data, cb_data, len);
1192
1193 spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags);
1194 }
1195
1196 spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags);
1197}
1198
Jon Mason282a2fe2013-02-12 09:52:50 -07001199static void ntb_rx_copy_callback(void *data)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001200{
Jon Mason282a2fe2013-02-12 09:52:50 -07001201 struct ntb_queue_entry *entry = data;
Jon Mason448c6fb2013-01-19 02:02:27 -07001202
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001203 entry->flags |= DESC_DONE_FLAG;
Jon Mason282a2fe2013-02-12 09:52:50 -07001204
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001205 ntb_complete_rxc(entry->qp);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001206}
1207
Jon Mason282a2fe2013-02-12 09:52:50 -07001208static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset)
1209{
1210 void *buf = entry->buf;
1211 size_t len = entry->len;
1212
1213 memcpy(buf, offset, len);
1214
Allen Hubbee26a5842015-04-09 10:33:20 -04001215 /* Ensure that the data is fully copied out before clearing the flag */
1216 wmb();
1217
Jon Mason282a2fe2013-02-12 09:52:50 -07001218 ntb_rx_copy_callback(entry);
1219}
1220
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001221static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset)
Jon Mason282a2fe2013-02-12 09:52:50 -07001222{
1223 struct dma_async_tx_descriptor *txd;
1224 struct ntb_transport_qp *qp = entry->qp;
Dave Jiang569410ca2015-07-13 08:07:22 -04001225 struct dma_chan *chan = qp->rx_dma_chan;
Jon Mason282a2fe2013-02-12 09:52:50 -07001226 struct dma_device *device;
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001227 size_t pay_off, buff_off, len;
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001228 struct dmaengine_unmap_data *unmap;
Jon Mason282a2fe2013-02-12 09:52:50 -07001229 dma_cookie_t cookie;
1230 void *buf = entry->buf;
Jon Mason282a2fe2013-02-12 09:52:50 -07001231
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001232 len = entry->len;
Jon Mason282a2fe2013-02-12 09:52:50 -07001233
1234 if (!chan)
1235 goto err;
1236
Jon Mason53ca4fe2013-11-26 11:21:50 -07001237 if (len < copy_bytes)
Allen Hubbe905921e2015-07-13 08:07:21 -04001238 goto err;
Jon Mason282a2fe2013-02-12 09:52:50 -07001239
1240 device = chan->device;
Allen Hubbee26a5842015-04-09 10:33:20 -04001241 pay_off = (size_t)offset & ~PAGE_MASK;
1242 buff_off = (size_t)buf & ~PAGE_MASK;
Jon Mason282a2fe2013-02-12 09:52:50 -07001243
1244 if (!is_dma_copy_aligned(device, pay_off, buff_off, len))
Allen Hubbe905921e2015-07-13 08:07:21 -04001245 goto err;
Jon Mason282a2fe2013-02-12 09:52:50 -07001246
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001247 unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT);
1248 if (!unmap)
Allen Hubbe905921e2015-07-13 08:07:21 -04001249 goto err;
Jon Mason282a2fe2013-02-12 09:52:50 -07001250
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001251 unmap->len = len;
1252 unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset),
1253 pay_off, len, DMA_TO_DEVICE);
1254 if (dma_mapping_error(device->dev, unmap->addr[0]))
1255 goto err_get_unmap;
Jon Mason282a2fe2013-02-12 09:52:50 -07001256
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001257 unmap->to_cnt = 1;
1258
1259 unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf),
1260 buff_off, len, DMA_FROM_DEVICE);
1261 if (dma_mapping_error(device->dev, unmap->addr[1]))
1262 goto err_get_unmap;
1263
1264 unmap->from_cnt = 1;
1265
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001266 txd = device->device_prep_dma_memcpy(chan, unmap->addr[1],
Bartlomiej Zolnierkiewicz0776ae72013-10-18 19:35:33 +02001267 unmap->addr[0], len,
1268 DMA_PREP_INTERRUPT);
Jon Mason282a2fe2013-02-12 09:52:50 -07001269 if (!txd)
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001270 goto err_get_unmap;
Jon Mason282a2fe2013-02-12 09:52:50 -07001271
1272 txd->callback = ntb_rx_copy_callback;
1273 txd->callback_param = entry;
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001274 dma_set_unmap(txd, unmap);
Jon Mason282a2fe2013-02-12 09:52:50 -07001275
1276 cookie = dmaengine_submit(txd);
1277 if (dma_submit_error(cookie))
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001278 goto err_set_unmap;
1279
1280 dmaengine_unmap_put(unmap);
Jon Mason282a2fe2013-02-12 09:52:50 -07001281
1282 qp->last_cookie = cookie;
1283
1284 qp->rx_async++;
1285
1286 return;
1287
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001288err_set_unmap:
1289 dmaengine_unmap_put(unmap);
1290err_get_unmap:
1291 dmaengine_unmap_put(unmap);
Jon Mason282a2fe2013-02-12 09:52:50 -07001292err:
1293 ntb_memcpy_rx(entry, offset);
1294 qp->rx_memcpy++;
1295}
1296
Jon Masonfce8a7b2012-11-16 19:27:12 -07001297static int ntb_process_rxc(struct ntb_transport_qp *qp)
1298{
1299 struct ntb_payload_header *hdr;
1300 struct ntb_queue_entry *entry;
1301 void *offset;
1302
Jon Mason793c20e2013-01-19 02:02:26 -07001303 offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index;
1304 hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header);
1305
Allen Hubbee26a5842015-04-09 10:33:20 -04001306 dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n",
1307 qp->qp_num, hdr->ver, hdr->len, hdr->flags);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001308
Jon Masonfce8a7b2012-11-16 19:27:12 -07001309 if (!(hdr->flags & DESC_DONE_FLAG)) {
Allen Hubbee26a5842015-04-09 10:33:20 -04001310 dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n");
Jon Masonfce8a7b2012-11-16 19:27:12 -07001311 qp->rx_ring_empty++;
1312 return -EAGAIN;
1313 }
1314
Allen Hubbee26a5842015-04-09 10:33:20 -04001315 if (hdr->flags & LINK_DOWN_FLAG) {
1316 dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n");
1317 ntb_qp_link_down(qp);
1318 hdr->flags = 0;
Allen Hubbec0900b32015-05-12 06:24:27 -04001319 return -EAGAIN;
Allen Hubbee26a5842015-04-09 10:33:20 -04001320 }
1321
1322 if (hdr->ver != (u32)qp->rx_pkts) {
1323 dev_dbg(&qp->ndev->pdev->dev,
1324 "version mismatch, expected %llu - got %u\n",
1325 qp->rx_pkts, hdr->ver);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001326 qp->rx_err_ver++;
1327 return -EIO;
1328 }
1329
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001330 entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q);
Allen Hubbee26a5842015-04-09 10:33:20 -04001331 if (!entry) {
1332 dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n");
1333 qp->rx_err_no_buf++;
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001334 return -EAGAIN;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001335 }
1336
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001337 entry->rx_hdr = hdr;
1338 entry->index = qp->rx_index;
1339
Allen Hubbee26a5842015-04-09 10:33:20 -04001340 if (hdr->len > entry->len) {
1341 dev_dbg(&qp->ndev->pdev->dev,
1342 "receive buffer overflow! Wanted %d got %d\n",
1343 hdr->len, entry->len);
1344 qp->rx_err_oflow++;
1345
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001346 entry->len = -EIO;
1347 entry->flags |= DESC_DONE_FLAG;
1348
1349 ntb_complete_rxc(qp);
1350 } else {
1351 dev_dbg(&qp->ndev->pdev->dev,
1352 "RX OK index %u ver %u size %d into buf size %d\n",
1353 qp->rx_index, hdr->ver, hdr->len, entry->len);
1354
1355 qp->rx_bytes += hdr->len;
1356 qp->rx_pkts++;
1357
1358 entry->len = hdr->len;
1359
1360 ntb_async_rx(entry, offset);
Allen Hubbee26a5842015-04-09 10:33:20 -04001361 }
1362
Jon Mason282a2fe2013-02-12 09:52:50 -07001363 qp->rx_index++;
1364 qp->rx_index %= qp->rx_max_entry;
1365
1366 return 0;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001367}
1368
Allen Hubbee26a5842015-04-09 10:33:20 -04001369static void ntb_transport_rxc_db(unsigned long data)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001370{
Allen Hubbee26a5842015-04-09 10:33:20 -04001371 struct ntb_transport_qp *qp = (void *)data;
Jon Masonc336acd2013-01-17 15:28:45 -07001372 int rc, i;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001373
Allen Hubbee26a5842015-04-09 10:33:20 -04001374 dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n",
1375 __func__, qp->qp_num);
Jon Masone8aeb602013-04-18 17:59:44 -07001376
Jon Masonc336acd2013-01-17 15:28:45 -07001377 /* Limit the number of packets processed in a single interrupt to
1378 * provide fairness to others
1379 */
1380 for (i = 0; i < qp->rx_max_entry; i++) {
Jon Masonfce8a7b2012-11-16 19:27:12 -07001381 rc = ntb_process_rxc(qp);
Jon Masonc336acd2013-01-17 15:28:45 -07001382 if (rc)
1383 break;
1384 }
Jon Mason282a2fe2013-02-12 09:52:50 -07001385
Dave Jiang569410ca2015-07-13 08:07:22 -04001386 if (i && qp->rx_dma_chan)
1387 dma_async_issue_pending(qp->rx_dma_chan);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001388
Allen Hubbee26a5842015-04-09 10:33:20 -04001389 if (i == qp->rx_max_entry) {
1390 /* there is more work to do */
1391 tasklet_schedule(&qp->rxc_db_work);
1392 } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) {
1393 /* the doorbell bit is set: clear it */
1394 ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num));
1395 /* ntb_db_read ensures ntb_db_clear write is committed */
1396 ntb_db_read(qp->ndev);
1397
1398 /* an interrupt may have arrived between finishing
1399 * ntb_process_rxc and clearing the doorbell bit:
1400 * there might be some more work to do.
1401 */
1402 tasklet_schedule(&qp->rxc_db_work);
1403 }
Jon Masonfce8a7b2012-11-16 19:27:12 -07001404}
1405
Jon Mason282a2fe2013-02-12 09:52:50 -07001406static void ntb_tx_copy_callback(void *data)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001407{
Jon Mason282a2fe2013-02-12 09:52:50 -07001408 struct ntb_queue_entry *entry = data;
1409 struct ntb_transport_qp *qp = entry->qp;
1410 struct ntb_payload_header __iomem *hdr = entry->tx_hdr;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001411
Jon Mason74465642013-01-21 15:28:52 -07001412 iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001413
Allen Hubbee26a5842015-04-09 10:33:20 -04001414 ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num));
Jon Masonfce8a7b2012-11-16 19:27:12 -07001415
1416 /* The entry length can only be zero if the packet is intended to be a
1417 * "link down" or similar. Since no payload is being sent in these
1418 * cases, there is nothing to add to the completion queue.
1419 */
1420 if (entry->len > 0) {
1421 qp->tx_bytes += entry->len;
1422
1423 if (qp->tx_handler)
1424 qp->tx_handler(qp, qp->cb_data, entry->cb_data,
1425 entry->len);
1426 }
1427
1428 ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q);
1429}
1430
Jon Mason282a2fe2013-02-12 09:52:50 -07001431static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset)
1432{
Dave Jiang06917f72015-05-19 16:45:46 -04001433#ifdef ARCH_HAS_NOCACHE_UACCESS
1434 /*
1435 * Using non-temporal mov to improve performance on non-cached
1436 * writes, even though we aren't actually copying from user space.
1437 */
1438 __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len);
1439#else
Jon Mason282a2fe2013-02-12 09:52:50 -07001440 memcpy_toio(offset, entry->buf, entry->len);
Dave Jiang06917f72015-05-19 16:45:46 -04001441#endif
Jon Mason282a2fe2013-02-12 09:52:50 -07001442
Allen Hubbee26a5842015-04-09 10:33:20 -04001443 /* Ensure that the data is fully copied out before setting the flags */
1444 wmb();
1445
Jon Mason282a2fe2013-02-12 09:52:50 -07001446 ntb_tx_copy_callback(entry);
1447}
1448
1449static void ntb_async_tx(struct ntb_transport_qp *qp,
1450 struct ntb_queue_entry *entry)
1451{
1452 struct ntb_payload_header __iomem *hdr;
1453 struct dma_async_tx_descriptor *txd;
Dave Jiang569410ca2015-07-13 08:07:22 -04001454 struct dma_chan *chan = qp->tx_dma_chan;
Jon Mason282a2fe2013-02-12 09:52:50 -07001455 struct dma_device *device;
1456 size_t dest_off, buff_off;
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001457 struct dmaengine_unmap_data *unmap;
1458 dma_addr_t dest;
Jon Mason282a2fe2013-02-12 09:52:50 -07001459 dma_cookie_t cookie;
1460 void __iomem *offset;
1461 size_t len = entry->len;
1462 void *buf = entry->buf;
Jon Mason282a2fe2013-02-12 09:52:50 -07001463
1464 offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
1465 hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header);
1466 entry->tx_hdr = hdr;
1467
1468 iowrite32(entry->len, &hdr->len);
Allen Hubbee26a5842015-04-09 10:33:20 -04001469 iowrite32((u32)qp->tx_pkts, &hdr->ver);
Jon Mason282a2fe2013-02-12 09:52:50 -07001470
1471 if (!chan)
1472 goto err;
1473
1474 if (len < copy_bytes)
1475 goto err;
1476
1477 device = chan->device;
1478 dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index;
Allen Hubbee26a5842015-04-09 10:33:20 -04001479 buff_off = (size_t)buf & ~PAGE_MASK;
1480 dest_off = (size_t)dest & ~PAGE_MASK;
Jon Mason282a2fe2013-02-12 09:52:50 -07001481
1482 if (!is_dma_copy_aligned(device, buff_off, dest_off, len))
1483 goto err;
1484
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001485 unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT);
1486 if (!unmap)
Jon Mason282a2fe2013-02-12 09:52:50 -07001487 goto err;
1488
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001489 unmap->len = len;
1490 unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf),
1491 buff_off, len, DMA_TO_DEVICE);
1492 if (dma_mapping_error(device->dev, unmap->addr[0]))
1493 goto err_get_unmap;
1494
1495 unmap->to_cnt = 1;
1496
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001497 txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len,
Bartlomiej Zolnierkiewicz0776ae72013-10-18 19:35:33 +02001498 DMA_PREP_INTERRUPT);
Jon Mason282a2fe2013-02-12 09:52:50 -07001499 if (!txd)
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001500 goto err_get_unmap;
Jon Mason282a2fe2013-02-12 09:52:50 -07001501
1502 txd->callback = ntb_tx_copy_callback;
1503 txd->callback_param = entry;
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001504 dma_set_unmap(txd, unmap);
Jon Mason282a2fe2013-02-12 09:52:50 -07001505
1506 cookie = dmaengine_submit(txd);
1507 if (dma_submit_error(cookie))
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001508 goto err_set_unmap;
1509
1510 dmaengine_unmap_put(unmap);
Jon Mason282a2fe2013-02-12 09:52:50 -07001511
1512 dma_async_issue_pending(chan);
1513 qp->tx_async++;
1514
1515 return;
Bartlomiej Zolnierkiewicz6f57fd02013-10-18 19:35:31 +02001516err_set_unmap:
1517 dmaengine_unmap_put(unmap);
1518err_get_unmap:
1519 dmaengine_unmap_put(unmap);
Jon Mason282a2fe2013-02-12 09:52:50 -07001520err:
1521 ntb_memcpy_tx(entry, offset);
1522 qp->tx_memcpy++;
1523}
1524
Jon Masonfce8a7b2012-11-16 19:27:12 -07001525static int ntb_process_tx(struct ntb_transport_qp *qp,
1526 struct ntb_queue_entry *entry)
1527{
Jon Mason793c20e2013-01-19 02:02:26 -07001528 if (qp->tx_index == qp->remote_rx_info->entry) {
Jon Masonfce8a7b2012-11-16 19:27:12 -07001529 qp->tx_ring_full++;
1530 return -EAGAIN;
1531 }
1532
Jon Masonef114ed2013-01-19 02:02:18 -07001533 if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) {
Jon Masonfce8a7b2012-11-16 19:27:12 -07001534 if (qp->tx_handler)
1535 qp->tx_handler(qp->cb_data, qp, NULL, -EIO);
1536
1537 ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
1538 &qp->tx_free_q);
1539 return 0;
1540 }
1541
Jon Mason282a2fe2013-02-12 09:52:50 -07001542 ntb_async_tx(qp, entry);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001543
Jon Mason793c20e2013-01-19 02:02:26 -07001544 qp->tx_index++;
1545 qp->tx_index %= qp->tx_max_entry;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001546
1547 qp->tx_pkts++;
1548
1549 return 0;
1550}
1551
1552static void ntb_send_link_down(struct ntb_transport_qp *qp)
1553{
Allen Hubbee26a5842015-04-09 10:33:20 -04001554 struct pci_dev *pdev = qp->ndev->pdev;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001555 struct ntb_queue_entry *entry;
1556 int i, rc;
1557
Allen Hubbee26a5842015-04-09 10:33:20 -04001558 if (!qp->link_is_up)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001559 return;
1560
Allen Hubbee22e0b92015-05-12 06:55:44 -04001561 dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001562
1563 for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) {
Jon Masonf7667552013-01-19 02:02:24 -07001564 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001565 if (entry)
1566 break;
1567 msleep(100);
1568 }
1569
1570 if (!entry)
1571 return;
1572
1573 entry->cb_data = NULL;
1574 entry->buf = NULL;
1575 entry->len = 0;
1576 entry->flags = LINK_DOWN_FLAG;
1577
1578 rc = ntb_process_tx(qp, entry);
1579 if (rc)
1580 dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n",
1581 qp->qp_num);
Allen Hubbe2849b5d72015-05-12 08:09:15 -04001582
1583 ntb_qp_link_down_reset(qp);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001584}
1585
Allen Hubbe1199aa62015-05-18 06:20:47 -04001586static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node)
1587{
1588 return dev_to_node(&chan->dev->device) == (int)(unsigned long)node;
1589}
1590
Jon Masonfce8a7b2012-11-16 19:27:12 -07001591/**
1592 * ntb_transport_create_queue - Create a new NTB transport layer queue
1593 * @rx_handler: receive callback function
1594 * @tx_handler: transmit callback function
1595 * @event_handler: event callback function
1596 *
1597 * Create a new NTB transport layer queue and provide the queue with a callback
1598 * routine for both transmit and receive. The receive callback routine will be
1599 * used to pass up data when the transport has received it on the queue. The
1600 * transmit callback routine will be called when the transport has completed the
1601 * transmission of the data on the queue and the data is ready to be freed.
1602 *
1603 * RETURNS: pointer to newly created ntb_queue, NULL on error.
1604 */
1605struct ntb_transport_qp *
Allen Hubbee26a5842015-04-09 10:33:20 -04001606ntb_transport_create_queue(void *data, struct device *client_dev,
Jon Masonfce8a7b2012-11-16 19:27:12 -07001607 const struct ntb_queue_handlers *handlers)
1608{
Allen Hubbee26a5842015-04-09 10:33:20 -04001609 struct ntb_dev *ndev;
1610 struct pci_dev *pdev;
1611 struct ntb_transport_ctx *nt;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001612 struct ntb_queue_entry *entry;
1613 struct ntb_transport_qp *qp;
Allen Hubbee26a5842015-04-09 10:33:20 -04001614 u64 qp_bit;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001615 unsigned int free_queue;
Allen Hubbe1199aa62015-05-18 06:20:47 -04001616 dma_cap_mask_t dma_mask;
1617 int node;
Allen Hubbee26a5842015-04-09 10:33:20 -04001618 int i;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001619
Allen Hubbee26a5842015-04-09 10:33:20 -04001620 ndev = dev_ntb(client_dev->parent);
1621 pdev = ndev->pdev;
1622 nt = ndev->ctx;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001623
Allen Hubbe1199aa62015-05-18 06:20:47 -04001624 node = dev_to_node(&ndev->dev);
1625
Jon Masonfce8a7b2012-11-16 19:27:12 -07001626 free_queue = ffs(nt->qp_bitmap);
1627 if (!free_queue)
1628 goto err;
1629
1630 /* decrement free_queue to make it zero based */
1631 free_queue--;
1632
Allen Hubbee26a5842015-04-09 10:33:20 -04001633 qp = &nt->qp_vec[free_queue];
1634 qp_bit = BIT_ULL(qp->qp_num);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001635
Allen Hubbee26a5842015-04-09 10:33:20 -04001636 nt->qp_bitmap_free &= ~qp_bit;
1637
Jon Masonfce8a7b2012-11-16 19:27:12 -07001638 qp->cb_data = data;
1639 qp->rx_handler = handlers->rx_handler;
1640 qp->tx_handler = handlers->tx_handler;
1641 qp->event_handler = handlers->event_handler;
1642
Allen Hubbe1199aa62015-05-18 06:20:47 -04001643 dma_cap_zero(dma_mask);
1644 dma_cap_set(DMA_MEMCPY, dma_mask);
1645
Dave Jianga41ef052015-05-19 16:52:04 -04001646 if (use_dma) {
Dave Jiang569410ca2015-07-13 08:07:22 -04001647 qp->tx_dma_chan =
1648 dma_request_channel(dma_mask, ntb_dma_filter_fn,
1649 (void *)(unsigned long)node);
1650 if (!qp->tx_dma_chan)
1651 dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n");
1652
1653 qp->rx_dma_chan =
1654 dma_request_channel(dma_mask, ntb_dma_filter_fn,
1655 (void *)(unsigned long)node);
1656 if (!qp->rx_dma_chan)
1657 dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n");
Dave Jianga41ef052015-05-19 16:52:04 -04001658 } else {
Dave Jiang569410ca2015-07-13 08:07:22 -04001659 qp->tx_dma_chan = NULL;
1660 qp->rx_dma_chan = NULL;
Dave Jianga41ef052015-05-19 16:52:04 -04001661 }
Dave Jiang569410ca2015-07-13 08:07:22 -04001662
1663 dev_dbg(&pdev->dev, "Using %s memcpy for TX\n",
1664 qp->tx_dma_chan ? "DMA" : "CPU");
1665
1666 dev_dbg(&pdev->dev, "Using %s memcpy for RX\n",
1667 qp->rx_dma_chan ? "DMA" : "CPU");
Jon Mason282a2fe2013-02-12 09:52:50 -07001668
Jon Masonfce8a7b2012-11-16 19:27:12 -07001669 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
Allen Hubbe1199aa62015-05-18 06:20:47 -04001670 entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001671 if (!entry)
1672 goto err1;
1673
Jon Mason282a2fe2013-02-12 09:52:50 -07001674 entry->qp = qp;
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001675 ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry,
Jon Masonf7667552013-01-19 02:02:24 -07001676 &qp->rx_free_q);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001677 }
1678
1679 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
Allen Hubbe1199aa62015-05-18 06:20:47 -04001680 entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001681 if (!entry)
1682 goto err2;
1683
Jon Mason282a2fe2013-02-12 09:52:50 -07001684 entry->qp = qp;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001685 ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
Jon Masonf7667552013-01-19 02:02:24 -07001686 &qp->tx_free_q);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001687 }
1688
Allen Hubbee26a5842015-04-09 10:33:20 -04001689 ntb_db_clear(qp->ndev, qp_bit);
1690 ntb_db_clear_mask(qp->ndev, qp_bit);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001691
1692 dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num);
1693
1694 return qp;
1695
Jon Masonfce8a7b2012-11-16 19:27:12 -07001696err2:
Jon Masonf7667552013-01-19 02:02:24 -07001697 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
Jon Masonfce8a7b2012-11-16 19:27:12 -07001698 kfree(entry);
1699err1:
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001700 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q)))
Jon Masonfce8a7b2012-11-16 19:27:12 -07001701 kfree(entry);
Dave Jiang569410ca2015-07-13 08:07:22 -04001702 if (qp->tx_dma_chan)
1703 dma_release_channel(qp->tx_dma_chan);
1704 if (qp->rx_dma_chan)
1705 dma_release_channel(qp->rx_dma_chan);
Allen Hubbee26a5842015-04-09 10:33:20 -04001706 nt->qp_bitmap_free |= qp_bit;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001707err:
1708 return NULL;
1709}
1710EXPORT_SYMBOL_GPL(ntb_transport_create_queue);
1711
1712/**
1713 * ntb_transport_free_queue - Frees NTB transport queue
1714 * @qp: NTB queue to be freed
1715 *
1716 * Frees NTB transport queue
1717 */
1718void ntb_transport_free_queue(struct ntb_transport_qp *qp)
1719{
Jon Mason186f27f2013-01-22 11:35:40 -07001720 struct pci_dev *pdev;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001721 struct ntb_queue_entry *entry;
Allen Hubbee26a5842015-04-09 10:33:20 -04001722 u64 qp_bit;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001723
1724 if (!qp)
1725 return;
1726
Allen Hubbee26a5842015-04-09 10:33:20 -04001727 pdev = qp->ndev->pdev;
Jon Mason186f27f2013-01-22 11:35:40 -07001728
Dave Jiang569410ca2015-07-13 08:07:22 -04001729 if (qp->tx_dma_chan) {
1730 struct dma_chan *chan = qp->tx_dma_chan;
Jon Mason282a2fe2013-02-12 09:52:50 -07001731 /* Putting the dma_chan to NULL will force any new traffic to be
1732 * processed by the CPU instead of the DAM engine
1733 */
Dave Jiang569410ca2015-07-13 08:07:22 -04001734 qp->tx_dma_chan = NULL;
1735
1736 /* Try to be nice and wait for any queued DMA engine
1737 * transactions to process before smashing it with a rock
1738 */
1739 dma_sync_wait(chan, qp->last_cookie);
1740 dmaengine_terminate_all(chan);
1741 dma_release_channel(chan);
1742 }
1743
1744 if (qp->rx_dma_chan) {
1745 struct dma_chan *chan = qp->rx_dma_chan;
1746 /* Putting the dma_chan to NULL will force any new traffic to be
1747 * processed by the CPU instead of the DAM engine
1748 */
1749 qp->rx_dma_chan = NULL;
Jon Mason282a2fe2013-02-12 09:52:50 -07001750
1751 /* Try to be nice and wait for any queued DMA engine
1752 * transactions to process before smashing it with a rock
1753 */
1754 dma_sync_wait(chan, qp->last_cookie);
1755 dmaengine_terminate_all(chan);
Allen Hubbe1199aa62015-05-18 06:20:47 -04001756 dma_release_channel(chan);
Jon Mason282a2fe2013-02-12 09:52:50 -07001757 }
Jon Masonfce8a7b2012-11-16 19:27:12 -07001758
Allen Hubbee26a5842015-04-09 10:33:20 -04001759 qp_bit = BIT_ULL(qp->qp_num);
1760
1761 ntb_db_set_mask(qp->ndev, qp_bit);
1762 tasklet_disable(&qp->rxc_db_work);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001763
Jon Mason282a2fe2013-02-12 09:52:50 -07001764 cancel_delayed_work_sync(&qp->link_work);
1765
Allen Hubbee26a5842015-04-09 10:33:20 -04001766 qp->cb_data = NULL;
1767 qp->rx_handler = NULL;
1768 qp->tx_handler = NULL;
1769 qp->event_handler = NULL;
1770
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001771 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q)))
Jon Masonfce8a7b2012-11-16 19:27:12 -07001772 kfree(entry);
1773
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001774 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) {
1775 dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n");
1776 kfree(entry);
1777 }
1778
1779 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) {
1780 dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n");
Jon Masonfce8a7b2012-11-16 19:27:12 -07001781 kfree(entry);
1782 }
1783
Jon Masonf7667552013-01-19 02:02:24 -07001784 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
Jon Masonfce8a7b2012-11-16 19:27:12 -07001785 kfree(entry);
1786
Allen Hubbe30a4bb12015-07-13 08:07:14 -04001787 qp->transport->qp_bitmap_free |= qp_bit;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001788
1789 dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num);
1790}
1791EXPORT_SYMBOL_GPL(ntb_transport_free_queue);
1792
1793/**
1794 * ntb_transport_rx_remove - Dequeues enqueued rx packet
1795 * @qp: NTB queue to be freed
1796 * @len: pointer to variable to write enqueued buffers length
1797 *
1798 * Dequeues unused buffers from receive queue. Should only be used during
1799 * shutdown of qp.
1800 *
1801 * RETURNS: NULL error value on error, or void* for success.
1802 */
1803void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len)
1804{
1805 struct ntb_queue_entry *entry;
1806 void *buf;
1807
Allen Hubbee26a5842015-04-09 10:33:20 -04001808 if (!qp || qp->client_ready)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001809 return NULL;
1810
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001811 entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001812 if (!entry)
1813 return NULL;
1814
1815 buf = entry->cb_data;
1816 *len = entry->len;
1817
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001818 ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001819
1820 return buf;
1821}
1822EXPORT_SYMBOL_GPL(ntb_transport_rx_remove);
1823
1824/**
1825 * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry
1826 * @qp: NTB transport layer queue the entry is to be enqueued on
1827 * @cb: per buffer pointer for callback function to use
1828 * @data: pointer to data buffer that incoming packets will be copied into
1829 * @len: length of the data buffer
1830 *
1831 * Enqueue a new receive buffer onto the transport queue into which a NTB
1832 * payload can be received into.
1833 *
1834 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1835 */
1836int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
1837 unsigned int len)
1838{
1839 struct ntb_queue_entry *entry;
1840
1841 if (!qp)
1842 return -EINVAL;
1843
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001844 entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001845 if (!entry)
1846 return -ENOMEM;
1847
1848 entry->cb_data = cb;
1849 entry->buf = data;
1850 entry->len = len;
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001851 entry->flags = 0;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001852
Allen Hubbeda2e5ae2015-07-13 08:07:08 -04001853 ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q);
1854
1855 tasklet_schedule(&qp->rxc_db_work);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001856
1857 return 0;
1858}
1859EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue);
1860
1861/**
1862 * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry
1863 * @qp: NTB transport layer queue the entry is to be enqueued on
1864 * @cb: per buffer pointer for callback function to use
1865 * @data: pointer to data buffer that will be sent
1866 * @len: length of the data buffer
1867 *
1868 * Enqueue a new transmit buffer onto the transport queue from which a NTB
Jon Masonf9a2cf82013-07-29 16:46:43 -07001869 * payload will be transmitted. This assumes that a lock is being held to
Jon Masonfce8a7b2012-11-16 19:27:12 -07001870 * serialize access to the qp.
1871 *
1872 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
1873 */
1874int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
1875 unsigned int len)
1876{
1877 struct ntb_queue_entry *entry;
1878 int rc;
1879
Allen Hubbee26a5842015-04-09 10:33:20 -04001880 if (!qp || !qp->link_is_up || !len)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001881 return -EINVAL;
1882
1883 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
Jon Mason282a2fe2013-02-12 09:52:50 -07001884 if (!entry) {
1885 qp->tx_err_no_buf++;
Dave Jiange74bfee2015-07-13 08:07:17 -04001886 return -EBUSY;
Jon Mason282a2fe2013-02-12 09:52:50 -07001887 }
Jon Masonfce8a7b2012-11-16 19:27:12 -07001888
1889 entry->cb_data = cb;
1890 entry->buf = data;
1891 entry->len = len;
1892 entry->flags = 0;
1893
1894 rc = ntb_process_tx(qp, entry);
1895 if (rc)
1896 ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
1897 &qp->tx_free_q);
1898
1899 return rc;
1900}
1901EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue);
1902
1903/**
1904 * ntb_transport_link_up - Notify NTB transport of client readiness to use queue
1905 * @qp: NTB transport layer queue to be enabled
1906 *
1907 * Notify NTB transport layer of client readiness to use queue
1908 */
1909void ntb_transport_link_up(struct ntb_transport_qp *qp)
1910{
1911 if (!qp)
1912 return;
1913
Allen Hubbee26a5842015-04-09 10:33:20 -04001914 qp->client_ready = true;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001915
Allen Hubbee26a5842015-04-09 10:33:20 -04001916 if (qp->transport->link_is_up)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001917 schedule_delayed_work(&qp->link_work, 0);
1918}
1919EXPORT_SYMBOL_GPL(ntb_transport_link_up);
1920
1921/**
1922 * ntb_transport_link_down - Notify NTB transport to no longer enqueue data
1923 * @qp: NTB transport layer queue to be disabled
1924 *
1925 * Notify NTB transport layer of client's desire to no longer receive data on
1926 * transport queue specified. It is the client's responsibility to ensure all
Jon Masonf9a2cf82013-07-29 16:46:43 -07001927 * entries on queue are purged or otherwise handled appropriately.
Jon Masonfce8a7b2012-11-16 19:27:12 -07001928 */
1929void ntb_transport_link_down(struct ntb_transport_qp *qp)
1930{
Allen Hubbee26a5842015-04-09 10:33:20 -04001931 int val;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001932
1933 if (!qp)
1934 return;
1935
Allen Hubbee26a5842015-04-09 10:33:20 -04001936 qp->client_ready = false;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001937
Allen Hubbee26a5842015-04-09 10:33:20 -04001938 val = ntb_spad_read(qp->ndev, QP_LINKS);
Jon Masonfce8a7b2012-11-16 19:27:12 -07001939
Allen Hubbee26a5842015-04-09 10:33:20 -04001940 ntb_peer_spad_write(qp->ndev, QP_LINKS,
1941 val & ~BIT(qp->qp_num));
Jon Masonfce8a7b2012-11-16 19:27:12 -07001942
Allen Hubbee26a5842015-04-09 10:33:20 -04001943 if (qp->link_is_up)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001944 ntb_send_link_down(qp);
1945 else
1946 cancel_delayed_work_sync(&qp->link_work);
1947}
1948EXPORT_SYMBOL_GPL(ntb_transport_link_down);
1949
1950/**
1951 * ntb_transport_link_query - Query transport link state
1952 * @qp: NTB transport layer queue to be queried
1953 *
1954 * Query connectivity to the remote system of the NTB transport queue
1955 *
1956 * RETURNS: true for link up or false for link down
1957 */
1958bool ntb_transport_link_query(struct ntb_transport_qp *qp)
1959{
Jon Mason186f27f2013-01-22 11:35:40 -07001960 if (!qp)
1961 return false;
1962
Allen Hubbee26a5842015-04-09 10:33:20 -04001963 return qp->link_is_up;
Jon Masonfce8a7b2012-11-16 19:27:12 -07001964}
1965EXPORT_SYMBOL_GPL(ntb_transport_link_query);
1966
1967/**
1968 * ntb_transport_qp_num - Query the qp number
1969 * @qp: NTB transport layer queue to be queried
1970 *
1971 * Query qp number of the NTB transport queue
1972 *
1973 * RETURNS: a zero based number specifying the qp number
1974 */
1975unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp)
1976{
Jon Mason186f27f2013-01-22 11:35:40 -07001977 if (!qp)
1978 return 0;
1979
Jon Masonfce8a7b2012-11-16 19:27:12 -07001980 return qp->qp_num;
1981}
1982EXPORT_SYMBOL_GPL(ntb_transport_qp_num);
1983
1984/**
1985 * ntb_transport_max_size - Query the max payload size of a qp
1986 * @qp: NTB transport layer queue to be queried
1987 *
1988 * Query the maximum payload size permissible on the given qp
1989 *
1990 * RETURNS: the max payload size of a qp
1991 */
Jon Masonef114ed2013-01-19 02:02:18 -07001992unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp)
Jon Masonfce8a7b2012-11-16 19:27:12 -07001993{
Dave Jiang04afde42015-09-17 13:27:04 -07001994 unsigned int max_size;
Dave Jiang569410ca2015-07-13 08:07:22 -04001995 unsigned int copy_align;
Dave Jiang04afde42015-09-17 13:27:04 -07001996 struct dma_chan *rx_chan, *tx_chan;
Jon Mason282a2fe2013-02-12 09:52:50 -07001997
Jon Mason186f27f2013-01-22 11:35:40 -07001998 if (!qp)
1999 return 0;
2000
Dave Jiang04afde42015-09-17 13:27:04 -07002001 rx_chan = qp->rx_dma_chan;
2002 tx_chan = qp->tx_dma_chan;
Jon Mason282a2fe2013-02-12 09:52:50 -07002003
Dave Jiang04afde42015-09-17 13:27:04 -07002004 copy_align = max(rx_chan ? rx_chan->device->copy_align : 0,
2005 tx_chan ? tx_chan->device->copy_align : 0);
Dave Jiang569410ca2015-07-13 08:07:22 -04002006
Jon Mason282a2fe2013-02-12 09:52:50 -07002007 /* If DMA engine usage is possible, try to find the max size for that */
Dave Jiang04afde42015-09-17 13:27:04 -07002008 max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header);
2009 max_size = round_down(max_size, 1 << copy_align);
Jon Mason282a2fe2013-02-12 09:52:50 -07002010
Dave Jiang04afde42015-09-17 13:27:04 -07002011 return max_size;
Jon Masonfce8a7b2012-11-16 19:27:12 -07002012}
2013EXPORT_SYMBOL_GPL(ntb_transport_max_size);
Allen Hubbee26a5842015-04-09 10:33:20 -04002014
Dave Jiange74bfee2015-07-13 08:07:17 -04002015unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp)
2016{
2017 unsigned int head = qp->tx_index;
2018 unsigned int tail = qp->remote_rx_info->entry;
2019
2020 return tail > head ? tail - head : qp->tx_max_entry + tail - head;
2021}
2022EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry);
2023
Allen Hubbee26a5842015-04-09 10:33:20 -04002024static void ntb_transport_doorbell_callback(void *data, int vector)
2025{
2026 struct ntb_transport_ctx *nt = data;
2027 struct ntb_transport_qp *qp;
2028 u64 db_bits;
2029 unsigned int qp_num;
2030
2031 db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free &
2032 ntb_db_vector_mask(nt->ndev, vector));
2033
2034 while (db_bits) {
2035 qp_num = __ffs(db_bits);
2036 qp = &nt->qp_vec[qp_num];
2037
2038 tasklet_schedule(&qp->rxc_db_work);
2039
2040 db_bits &= ~BIT_ULL(qp_num);
2041 }
2042}
2043
2044static const struct ntb_ctx_ops ntb_transport_ops = {
2045 .link_event = ntb_transport_event_callback,
2046 .db_event = ntb_transport_doorbell_callback,
2047};
2048
2049static struct ntb_client ntb_transport_client = {
2050 .ops = {
2051 .probe = ntb_transport_probe,
2052 .remove = ntb_transport_free,
2053 },
2054};
2055
2056static int __init ntb_transport_init(void)
2057{
2058 int rc;
2059
Dave Jiang7eb38782015-06-15 08:21:33 -04002060 pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER);
2061
Allen Hubbee26a5842015-04-09 10:33:20 -04002062 if (debugfs_initialized())
2063 nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
2064
2065 rc = bus_register(&ntb_transport_bus);
2066 if (rc)
2067 goto err_bus;
2068
2069 rc = ntb_register_client(&ntb_transport_client);
2070 if (rc)
2071 goto err_client;
2072
2073 return 0;
2074
2075err_client:
2076 bus_unregister(&ntb_transport_bus);
2077err_bus:
2078 debugfs_remove_recursive(nt_debugfs_dir);
2079 return rc;
2080}
2081module_init(ntb_transport_init);
2082
2083static void __exit ntb_transport_exit(void)
2084{
2085 debugfs_remove_recursive(nt_debugfs_dir);
2086
2087 ntb_unregister_client(&ntb_transport_client);
2088 bus_unregister(&ntb_transport_bus);
2089}
2090module_exit(ntb_transport_exit);