Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 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) 2015 EMC Corporation. All Rights Reserved. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of version 2 of the GNU General Public License as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * General Public License for more details. |
| 17 | * |
| 18 | * BSD LICENSE |
| 19 | * |
| 20 | * Copyright (C) 2015 EMC Corporation. All Rights Reserved. |
| 21 | * |
| 22 | * Redistribution and use in source and binary forms, with or without |
| 23 | * modification, are permitted provided that the following conditions |
| 24 | * are met: |
| 25 | * |
| 26 | * * Redistributions of source code must retain the above copyright |
| 27 | * notice, this list of conditions and the following disclaimer. |
| 28 | * * Redistributions in binary form must reproduce the above copy |
| 29 | * notice, this list of conditions and the following disclaimer in |
| 30 | * the documentation and/or other materials provided with the |
| 31 | * distribution. |
| 32 | * * Neither the name of Intel Corporation nor the names of its |
| 33 | * contributors may be used to endorse or promote products derived |
| 34 | * from this software without specific prior written permission. |
| 35 | * |
| 36 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 37 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 38 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 39 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 40 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 41 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 42 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 43 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 44 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 45 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 46 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 47 | * |
| 48 | * PCIe NTB Debugging Tool Linux driver |
| 49 | * |
| 50 | * Contact Information: |
| 51 | * Allen Hubbe <Allen.Hubbe@emc.com> |
| 52 | */ |
| 53 | |
| 54 | /* |
| 55 | * How to use this tool, by example. |
| 56 | * |
| 57 | * Assuming $DBG_DIR is something like: |
| 58 | * '/sys/kernel/debug/ntb_tool/0000:00:03.0' |
| 59 | * |
| 60 | * Eg: check if clearing the doorbell mask generates an interrupt. |
| 61 | * |
| 62 | * # Set the doorbell mask |
| 63 | * root@self# echo 's 1' > $DBG_DIR/mask |
| 64 | * |
| 65 | * # Ring the doorbell from the peer |
| 66 | * root@peer# echo 's 1' > $DBG_DIR/peer_db |
| 67 | * |
| 68 | * # Clear the doorbell mask |
| 69 | * root@self# echo 'c 1' > $DBG_DIR/mask |
| 70 | * |
| 71 | * Observe debugging output in dmesg or your console. You should see a |
| 72 | * doorbell event triggered by clearing the mask. If not, this may indicate an |
| 73 | * issue with the hardware that needs to be worked around in the driver. |
| 74 | * |
| 75 | * Eg: read and write scratchpad registers |
| 76 | * |
| 77 | * root@peer# echo '0 0x01010101 1 0x7f7f7f7f' > $DBG_DIR/peer_spad |
| 78 | * |
| 79 | * root@self# cat $DBG_DIR/spad |
| 80 | * |
| 81 | * Observe that spad 0 and 1 have the values set by the peer. |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 82 | * |
| 83 | * # Check the memory window translation info |
| 84 | * cat $DBG_DIR/peer_trans0 |
| 85 | * |
| 86 | * # Setup a 16k memory window buffer |
| 87 | * echo 16384 > $DBG_DIR/peer_trans0 |
| 88 | * |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 89 | */ |
| 90 | |
| 91 | #include <linux/init.h> |
| 92 | #include <linux/kernel.h> |
| 93 | #include <linux/module.h> |
| 94 | |
| 95 | #include <linux/debugfs.h> |
| 96 | #include <linux/dma-mapping.h> |
| 97 | #include <linux/pci.h> |
| 98 | #include <linux/slab.h> |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 99 | #include <linux/uaccess.h> |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 100 | |
| 101 | #include <linux/ntb.h> |
| 102 | |
| 103 | #define DRIVER_NAME "ntb_tool" |
| 104 | #define DRIVER_DESCRIPTION "PCIe NTB Debugging Tool" |
| 105 | |
| 106 | #define DRIVER_LICENSE "Dual BSD/GPL" |
| 107 | #define DRIVER_VERSION "1.0" |
| 108 | #define DRIVER_RELDATE "22 April 2015" |
| 109 | #define DRIVER_AUTHOR "Allen Hubbe <Allen.Hubbe@emc.com>" |
| 110 | |
| 111 | MODULE_LICENSE(DRIVER_LICENSE); |
| 112 | MODULE_VERSION(DRIVER_VERSION); |
| 113 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 114 | MODULE_DESCRIPTION(DRIVER_DESCRIPTION); |
| 115 | |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 116 | #define MAX_MWS 16 |
| 117 | |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 118 | static struct dentry *tool_dbgfs; |
| 119 | |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 120 | struct tool_mw { |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 121 | int idx; |
| 122 | struct tool_ctx *tc; |
| 123 | resource_size_t win_size; |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 124 | resource_size_t size; |
| 125 | u8 __iomem *local; |
| 126 | u8 *peer; |
| 127 | dma_addr_t peer_dma; |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 128 | struct dentry *peer_dbg_file; |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 129 | }; |
| 130 | |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 131 | struct tool_ctx { |
| 132 | struct ntb_dev *ntb; |
| 133 | struct dentry *dbgfs; |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 134 | int mw_count; |
| 135 | struct tool_mw mws[MAX_MWS]; |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 136 | }; |
| 137 | |
| 138 | #define SPAD_FNAME_SIZE 0x10 |
| 139 | #define INT_PTR(x) ((void *)(unsigned long)x) |
| 140 | #define PTR_INT(x) ((int)(unsigned long)x) |
| 141 | |
| 142 | #define TOOL_FOPS_RDWR(__name, __read, __write) \ |
| 143 | const struct file_operations __name = { \ |
| 144 | .owner = THIS_MODULE, \ |
| 145 | .open = simple_open, \ |
| 146 | .read = __read, \ |
| 147 | .write = __write, \ |
| 148 | } |
| 149 | |
| 150 | static void tool_link_event(void *ctx) |
| 151 | { |
| 152 | struct tool_ctx *tc = ctx; |
| 153 | enum ntb_speed speed; |
| 154 | enum ntb_width width; |
| 155 | int up; |
| 156 | |
| 157 | up = ntb_link_is_up(tc->ntb, &speed, &width); |
| 158 | |
| 159 | dev_dbg(&tc->ntb->dev, "link is %s speed %d width %d\n", |
| 160 | up ? "up" : "down", speed, width); |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 161 | |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | static void tool_db_event(void *ctx, int vec) |
| 165 | { |
| 166 | struct tool_ctx *tc = ctx; |
| 167 | u64 db_bits, db_mask; |
| 168 | |
| 169 | db_mask = ntb_db_vector_mask(tc->ntb, vec); |
| 170 | db_bits = ntb_db_read(tc->ntb); |
| 171 | |
| 172 | dev_dbg(&tc->ntb->dev, "doorbell vec %d mask %#llx bits %#llx\n", |
| 173 | vec, db_mask, db_bits); |
| 174 | } |
| 175 | |
| 176 | static const struct ntb_ctx_ops tool_ops = { |
| 177 | .link_event = tool_link_event, |
| 178 | .db_event = tool_db_event, |
| 179 | }; |
| 180 | |
| 181 | static ssize_t tool_dbfn_read(struct tool_ctx *tc, char __user *ubuf, |
| 182 | size_t size, loff_t *offp, |
| 183 | u64 (*db_read_fn)(struct ntb_dev *)) |
| 184 | { |
| 185 | size_t buf_size; |
| 186 | char *buf; |
| 187 | ssize_t pos, rc; |
| 188 | |
| 189 | if (!db_read_fn) |
| 190 | return -EINVAL; |
| 191 | |
| 192 | buf_size = min_t(size_t, size, 0x20); |
| 193 | |
| 194 | buf = kmalloc(buf_size, GFP_KERNEL); |
| 195 | if (!buf) |
| 196 | return -ENOMEM; |
| 197 | |
| 198 | pos = scnprintf(buf, buf_size, "%#llx\n", |
| 199 | db_read_fn(tc->ntb)); |
| 200 | |
| 201 | rc = simple_read_from_buffer(ubuf, size, offp, buf, pos); |
| 202 | |
| 203 | kfree(buf); |
| 204 | |
| 205 | return rc; |
| 206 | } |
| 207 | |
| 208 | static ssize_t tool_dbfn_write(struct tool_ctx *tc, |
| 209 | const char __user *ubuf, |
| 210 | size_t size, loff_t *offp, |
| 211 | int (*db_set_fn)(struct ntb_dev *, u64), |
| 212 | int (*db_clear_fn)(struct ntb_dev *, u64)) |
| 213 | { |
| 214 | u64 db_bits; |
| 215 | char *buf, cmd; |
| 216 | ssize_t rc; |
| 217 | int n; |
| 218 | |
| 219 | buf = kmalloc(size + 1, GFP_KERNEL); |
| 220 | if (!buf) |
| 221 | return -ENOMEM; |
| 222 | |
| 223 | rc = simple_write_to_buffer(buf, size, offp, ubuf, size); |
| 224 | if (rc < 0) { |
| 225 | kfree(buf); |
| 226 | return rc; |
| 227 | } |
| 228 | |
| 229 | buf[size] = 0; |
| 230 | |
| 231 | n = sscanf(buf, "%c %lli", &cmd, &db_bits); |
| 232 | |
| 233 | kfree(buf); |
| 234 | |
| 235 | if (n != 2) { |
| 236 | rc = -EINVAL; |
| 237 | } else if (cmd == 's') { |
| 238 | if (!db_set_fn) |
| 239 | rc = -EINVAL; |
| 240 | else |
| 241 | rc = db_set_fn(tc->ntb, db_bits); |
| 242 | } else if (cmd == 'c') { |
| 243 | if (!db_clear_fn) |
| 244 | rc = -EINVAL; |
| 245 | else |
| 246 | rc = db_clear_fn(tc->ntb, db_bits); |
| 247 | } else { |
| 248 | rc = -EINVAL; |
| 249 | } |
| 250 | |
| 251 | return rc ? : size; |
| 252 | } |
| 253 | |
| 254 | static ssize_t tool_spadfn_read(struct tool_ctx *tc, char __user *ubuf, |
| 255 | size_t size, loff_t *offp, |
| 256 | u32 (*spad_read_fn)(struct ntb_dev *, int)) |
| 257 | { |
| 258 | size_t buf_size; |
| 259 | char *buf; |
| 260 | ssize_t pos, rc; |
| 261 | int i, spad_count; |
| 262 | |
| 263 | if (!spad_read_fn) |
| 264 | return -EINVAL; |
| 265 | |
Logan Gunthorpe | 625f080 | 2016-06-20 13:15:08 -0600 | [diff] [blame] | 266 | spad_count = ntb_spad_count(tc->ntb); |
| 267 | |
| 268 | /* |
| 269 | * We multiply the number of spads by 15 to get the buffer size |
| 270 | * this is from 3 for the %d, 10 for the largest hex value |
| 271 | * (0x00000000) and 2 for the tab and line feed. |
| 272 | */ |
| 273 | buf_size = min_t(size_t, size, spad_count * 15); |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 274 | |
| 275 | buf = kmalloc(buf_size, GFP_KERNEL); |
| 276 | if (!buf) |
| 277 | return -ENOMEM; |
| 278 | |
| 279 | pos = 0; |
| 280 | |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 281 | for (i = 0; i < spad_count; ++i) { |
| 282 | pos += scnprintf(buf + pos, buf_size - pos, "%d\t%#x\n", |
| 283 | i, spad_read_fn(tc->ntb, i)); |
| 284 | } |
| 285 | |
| 286 | rc = simple_read_from_buffer(ubuf, size, offp, buf, pos); |
| 287 | |
| 288 | kfree(buf); |
| 289 | |
| 290 | return rc; |
| 291 | } |
| 292 | |
| 293 | static ssize_t tool_spadfn_write(struct tool_ctx *tc, |
| 294 | const char __user *ubuf, |
| 295 | size_t size, loff_t *offp, |
| 296 | int (*spad_write_fn)(struct ntb_dev *, |
| 297 | int, u32)) |
| 298 | { |
| 299 | int spad_idx; |
| 300 | u32 spad_val; |
Logan Gunthorpe | c792eba | 2016-05-27 14:38:31 -0600 | [diff] [blame] | 301 | char *buf, *buf_ptr; |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 302 | int pos, n; |
| 303 | ssize_t rc; |
| 304 | |
| 305 | if (!spad_write_fn) { |
| 306 | dev_dbg(&tc->ntb->dev, "no spad write fn\n"); |
| 307 | return -EINVAL; |
| 308 | } |
| 309 | |
| 310 | buf = kmalloc(size + 1, GFP_KERNEL); |
| 311 | if (!buf) |
| 312 | return -ENOMEM; |
| 313 | |
| 314 | rc = simple_write_to_buffer(buf, size, offp, ubuf, size); |
| 315 | if (rc < 0) { |
| 316 | kfree(buf); |
| 317 | return rc; |
| 318 | } |
| 319 | |
| 320 | buf[size] = 0; |
Logan Gunthorpe | c792eba | 2016-05-27 14:38:31 -0600 | [diff] [blame] | 321 | buf_ptr = buf; |
| 322 | n = sscanf(buf_ptr, "%d %i%n", &spad_idx, &spad_val, &pos); |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 323 | while (n == 2) { |
Logan Gunthorpe | c792eba | 2016-05-27 14:38:31 -0600 | [diff] [blame] | 324 | buf_ptr += pos; |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 325 | rc = spad_write_fn(tc->ntb, spad_idx, spad_val); |
| 326 | if (rc) |
| 327 | break; |
| 328 | |
Logan Gunthorpe | c792eba | 2016-05-27 14:38:31 -0600 | [diff] [blame] | 329 | n = sscanf(buf_ptr, "%d %i%n", &spad_idx, &spad_val, &pos); |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 330 | } |
| 331 | |
| 332 | if (n < 0) |
| 333 | rc = n; |
| 334 | |
| 335 | kfree(buf); |
| 336 | |
| 337 | return rc ? : size; |
| 338 | } |
| 339 | |
| 340 | static ssize_t tool_db_read(struct file *filep, char __user *ubuf, |
| 341 | size_t size, loff_t *offp) |
| 342 | { |
| 343 | struct tool_ctx *tc = filep->private_data; |
| 344 | |
| 345 | return tool_dbfn_read(tc, ubuf, size, offp, |
| 346 | tc->ntb->ops->db_read); |
| 347 | } |
| 348 | |
| 349 | static ssize_t tool_db_write(struct file *filep, const char __user *ubuf, |
| 350 | size_t size, loff_t *offp) |
| 351 | { |
| 352 | struct tool_ctx *tc = filep->private_data; |
| 353 | |
| 354 | return tool_dbfn_write(tc, ubuf, size, offp, |
| 355 | tc->ntb->ops->db_set, |
| 356 | tc->ntb->ops->db_clear); |
| 357 | } |
| 358 | |
| 359 | static TOOL_FOPS_RDWR(tool_db_fops, |
| 360 | tool_db_read, |
| 361 | tool_db_write); |
| 362 | |
| 363 | static ssize_t tool_mask_read(struct file *filep, char __user *ubuf, |
| 364 | size_t size, loff_t *offp) |
| 365 | { |
| 366 | struct tool_ctx *tc = filep->private_data; |
| 367 | |
| 368 | return tool_dbfn_read(tc, ubuf, size, offp, |
| 369 | tc->ntb->ops->db_read_mask); |
| 370 | } |
| 371 | |
| 372 | static ssize_t tool_mask_write(struct file *filep, const char __user *ubuf, |
| 373 | size_t size, loff_t *offp) |
| 374 | { |
| 375 | struct tool_ctx *tc = filep->private_data; |
| 376 | |
| 377 | return tool_dbfn_write(tc, ubuf, size, offp, |
| 378 | tc->ntb->ops->db_set_mask, |
| 379 | tc->ntb->ops->db_clear_mask); |
| 380 | } |
| 381 | |
| 382 | static TOOL_FOPS_RDWR(tool_mask_fops, |
| 383 | tool_mask_read, |
| 384 | tool_mask_write); |
| 385 | |
| 386 | static ssize_t tool_peer_db_read(struct file *filep, char __user *ubuf, |
| 387 | size_t size, loff_t *offp) |
| 388 | { |
| 389 | struct tool_ctx *tc = filep->private_data; |
| 390 | |
| 391 | return tool_dbfn_read(tc, ubuf, size, offp, |
| 392 | tc->ntb->ops->peer_db_read); |
| 393 | } |
| 394 | |
| 395 | static ssize_t tool_peer_db_write(struct file *filep, const char __user *ubuf, |
| 396 | size_t size, loff_t *offp) |
| 397 | { |
| 398 | struct tool_ctx *tc = filep->private_data; |
| 399 | |
| 400 | return tool_dbfn_write(tc, ubuf, size, offp, |
| 401 | tc->ntb->ops->peer_db_set, |
| 402 | tc->ntb->ops->peer_db_clear); |
| 403 | } |
| 404 | |
| 405 | static TOOL_FOPS_RDWR(tool_peer_db_fops, |
| 406 | tool_peer_db_read, |
| 407 | tool_peer_db_write); |
| 408 | |
| 409 | static ssize_t tool_peer_mask_read(struct file *filep, char __user *ubuf, |
| 410 | size_t size, loff_t *offp) |
| 411 | { |
| 412 | struct tool_ctx *tc = filep->private_data; |
| 413 | |
| 414 | return tool_dbfn_read(tc, ubuf, size, offp, |
| 415 | tc->ntb->ops->peer_db_read_mask); |
| 416 | } |
| 417 | |
| 418 | static ssize_t tool_peer_mask_write(struct file *filep, const char __user *ubuf, |
| 419 | size_t size, loff_t *offp) |
| 420 | { |
| 421 | struct tool_ctx *tc = filep->private_data; |
| 422 | |
| 423 | return tool_dbfn_write(tc, ubuf, size, offp, |
| 424 | tc->ntb->ops->peer_db_set_mask, |
| 425 | tc->ntb->ops->peer_db_clear_mask); |
| 426 | } |
| 427 | |
| 428 | static TOOL_FOPS_RDWR(tool_peer_mask_fops, |
| 429 | tool_peer_mask_read, |
| 430 | tool_peer_mask_write); |
| 431 | |
| 432 | static ssize_t tool_spad_read(struct file *filep, char __user *ubuf, |
| 433 | size_t size, loff_t *offp) |
| 434 | { |
| 435 | struct tool_ctx *tc = filep->private_data; |
| 436 | |
| 437 | return tool_spadfn_read(tc, ubuf, size, offp, |
| 438 | tc->ntb->ops->spad_read); |
| 439 | } |
| 440 | |
| 441 | static ssize_t tool_spad_write(struct file *filep, const char __user *ubuf, |
| 442 | size_t size, loff_t *offp) |
| 443 | { |
| 444 | struct tool_ctx *tc = filep->private_data; |
| 445 | |
| 446 | return tool_spadfn_write(tc, ubuf, size, offp, |
| 447 | tc->ntb->ops->spad_write); |
| 448 | } |
| 449 | |
| 450 | static TOOL_FOPS_RDWR(tool_spad_fops, |
| 451 | tool_spad_read, |
| 452 | tool_spad_write); |
| 453 | |
| 454 | static ssize_t tool_peer_spad_read(struct file *filep, char __user *ubuf, |
| 455 | size_t size, loff_t *offp) |
| 456 | { |
| 457 | struct tool_ctx *tc = filep->private_data; |
| 458 | |
| 459 | return tool_spadfn_read(tc, ubuf, size, offp, |
| 460 | tc->ntb->ops->peer_spad_read); |
| 461 | } |
| 462 | |
| 463 | static ssize_t tool_peer_spad_write(struct file *filep, const char __user *ubuf, |
| 464 | size_t size, loff_t *offp) |
| 465 | { |
| 466 | struct tool_ctx *tc = filep->private_data; |
| 467 | |
| 468 | return tool_spadfn_write(tc, ubuf, size, offp, |
| 469 | tc->ntb->ops->peer_spad_write); |
| 470 | } |
| 471 | |
| 472 | static TOOL_FOPS_RDWR(tool_peer_spad_fops, |
| 473 | tool_peer_spad_read, |
| 474 | tool_peer_spad_write); |
| 475 | |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 476 | |
| 477 | static ssize_t tool_mw_read(struct file *filep, char __user *ubuf, |
| 478 | size_t size, loff_t *offp) |
| 479 | { |
| 480 | struct tool_mw *mw = filep->private_data; |
| 481 | ssize_t rc; |
| 482 | loff_t pos = *offp; |
| 483 | void *buf; |
| 484 | |
| 485 | if (mw->local == NULL) |
| 486 | return -EIO; |
| 487 | if (pos < 0) |
| 488 | return -EINVAL; |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 489 | if (pos >= mw->win_size || !size) |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 490 | return 0; |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 491 | if (size > mw->win_size - pos) |
| 492 | size = mw->win_size - pos; |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 493 | |
| 494 | buf = kmalloc(size, GFP_KERNEL); |
| 495 | if (!buf) |
| 496 | return -ENOMEM; |
| 497 | |
| 498 | memcpy_fromio(buf, mw->local + pos, size); |
| 499 | rc = copy_to_user(ubuf, buf, size); |
| 500 | if (rc == size) { |
| 501 | rc = -EFAULT; |
| 502 | goto err_free; |
| 503 | } |
| 504 | |
| 505 | size -= rc; |
| 506 | *offp = pos + size; |
| 507 | rc = size; |
| 508 | |
| 509 | err_free: |
| 510 | kfree(buf); |
| 511 | |
| 512 | return rc; |
| 513 | } |
| 514 | |
| 515 | static ssize_t tool_mw_write(struct file *filep, const char __user *ubuf, |
| 516 | size_t size, loff_t *offp) |
| 517 | { |
| 518 | struct tool_mw *mw = filep->private_data; |
| 519 | ssize_t rc; |
| 520 | loff_t pos = *offp; |
| 521 | void *buf; |
| 522 | |
| 523 | if (pos < 0) |
| 524 | return -EINVAL; |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 525 | if (pos >= mw->win_size || !size) |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 526 | return 0; |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 527 | if (size > mw->win_size - pos) |
| 528 | size = mw->win_size - pos; |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 529 | |
| 530 | buf = kmalloc(size, GFP_KERNEL); |
| 531 | if (!buf) |
| 532 | return -ENOMEM; |
| 533 | |
| 534 | rc = copy_from_user(buf, ubuf, size); |
| 535 | if (rc == size) { |
| 536 | rc = -EFAULT; |
| 537 | goto err_free; |
| 538 | } |
| 539 | |
| 540 | size -= rc; |
| 541 | *offp = pos + size; |
| 542 | rc = size; |
| 543 | |
| 544 | memcpy_toio(mw->local + pos, buf, size); |
| 545 | |
| 546 | err_free: |
| 547 | kfree(buf); |
| 548 | |
| 549 | return rc; |
| 550 | } |
| 551 | |
| 552 | static TOOL_FOPS_RDWR(tool_mw_fops, |
| 553 | tool_mw_read, |
| 554 | tool_mw_write); |
| 555 | |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 556 | static ssize_t tool_peer_mw_read(struct file *filep, char __user *ubuf, |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 557 | size_t size, loff_t *offp) |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 558 | { |
| 559 | struct tool_mw *mw = filep->private_data; |
| 560 | |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 561 | if (!mw->peer) |
| 562 | return -ENXIO; |
| 563 | |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 564 | return simple_read_from_buffer(ubuf, size, offp, mw->peer, mw->size); |
| 565 | } |
| 566 | |
| 567 | static ssize_t tool_peer_mw_write(struct file *filep, const char __user *ubuf, |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 568 | size_t size, loff_t *offp) |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 569 | { |
| 570 | struct tool_mw *mw = filep->private_data; |
| 571 | |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 572 | if (!mw->peer) |
| 573 | return -ENXIO; |
| 574 | |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 575 | return simple_write_to_buffer(mw->peer, mw->size, offp, ubuf, size); |
| 576 | } |
| 577 | |
| 578 | static TOOL_FOPS_RDWR(tool_peer_mw_fops, |
| 579 | tool_peer_mw_read, |
| 580 | tool_peer_mw_write); |
| 581 | |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 582 | static int tool_setup_mw(struct tool_ctx *tc, int idx, size_t req_size) |
| 583 | { |
| 584 | int rc; |
| 585 | struct tool_mw *mw = &tc->mws[idx]; |
| 586 | phys_addr_t base; |
| 587 | resource_size_t size, align, align_size; |
| 588 | char buf[16]; |
| 589 | |
| 590 | if (mw->peer) |
| 591 | return 0; |
| 592 | |
| 593 | rc = ntb_mw_get_range(tc->ntb, idx, &base, &size, &align, |
| 594 | &align_size); |
| 595 | if (rc) |
| 596 | return rc; |
| 597 | |
| 598 | mw->size = min_t(resource_size_t, req_size, size); |
| 599 | mw->size = round_up(mw->size, align); |
| 600 | mw->size = round_up(mw->size, align_size); |
| 601 | mw->peer = dma_alloc_coherent(&tc->ntb->pdev->dev, mw->size, |
| 602 | &mw->peer_dma, GFP_KERNEL); |
| 603 | |
| 604 | if (!mw->peer) |
| 605 | return -ENOMEM; |
| 606 | |
| 607 | rc = ntb_mw_set_trans(tc->ntb, idx, mw->peer_dma, mw->size); |
| 608 | if (rc) |
| 609 | goto err_free_dma; |
| 610 | |
| 611 | snprintf(buf, sizeof(buf), "peer_mw%d", idx); |
| 612 | mw->peer_dbg_file = debugfs_create_file(buf, S_IRUSR | S_IWUSR, |
| 613 | mw->tc->dbgfs, mw, |
| 614 | &tool_peer_mw_fops); |
| 615 | |
| 616 | return 0; |
| 617 | |
| 618 | err_free_dma: |
| 619 | dma_free_coherent(&tc->ntb->pdev->dev, mw->size, |
| 620 | mw->peer, |
| 621 | mw->peer_dma); |
| 622 | mw->peer = NULL; |
| 623 | mw->peer_dma = 0; |
| 624 | mw->size = 0; |
| 625 | |
| 626 | return rc; |
| 627 | } |
| 628 | |
| 629 | static void tool_free_mw(struct tool_ctx *tc, int idx) |
| 630 | { |
| 631 | struct tool_mw *mw = &tc->mws[idx]; |
| 632 | |
| 633 | if (mw->peer) { |
| 634 | ntb_mw_clear_trans(tc->ntb, idx); |
| 635 | dma_free_coherent(&tc->ntb->pdev->dev, mw->size, |
| 636 | mw->peer, |
| 637 | mw->peer_dma); |
| 638 | } |
| 639 | |
| 640 | mw->peer = NULL; |
| 641 | mw->peer_dma = 0; |
| 642 | |
| 643 | debugfs_remove(mw->peer_dbg_file); |
| 644 | |
| 645 | mw->peer_dbg_file = NULL; |
| 646 | } |
| 647 | |
| 648 | static ssize_t tool_peer_mw_trans_read(struct file *filep, |
| 649 | char __user *ubuf, |
| 650 | size_t size, loff_t *offp) |
| 651 | { |
| 652 | struct tool_mw *mw = filep->private_data; |
| 653 | |
| 654 | char *buf; |
| 655 | size_t buf_size; |
| 656 | ssize_t ret, off = 0; |
| 657 | |
| 658 | phys_addr_t base; |
| 659 | resource_size_t mw_size; |
| 660 | resource_size_t align; |
| 661 | resource_size_t align_size; |
| 662 | |
| 663 | buf_size = min_t(size_t, size, 512); |
| 664 | |
| 665 | buf = kmalloc(buf_size, GFP_KERNEL); |
| 666 | if (!buf) |
| 667 | return -ENOMEM; |
| 668 | |
| 669 | ntb_mw_get_range(mw->tc->ntb, mw->idx, |
| 670 | &base, &mw_size, &align, &align_size); |
| 671 | |
| 672 | off += scnprintf(buf + off, buf_size - off, |
| 673 | "Peer MW %d Information:\n", mw->idx); |
| 674 | |
| 675 | off += scnprintf(buf + off, buf_size - off, |
| 676 | "Physical Address \t%pa[p]\n", |
| 677 | &base); |
| 678 | |
| 679 | off += scnprintf(buf + off, buf_size - off, |
| 680 | "Window Size \t%lld\n", |
| 681 | (unsigned long long)mw_size); |
| 682 | |
| 683 | off += scnprintf(buf + off, buf_size - off, |
| 684 | "Alignment \t%lld\n", |
| 685 | (unsigned long long)align); |
| 686 | |
| 687 | off += scnprintf(buf + off, buf_size - off, |
| 688 | "Size Alignment \t%lld\n", |
| 689 | (unsigned long long)align_size); |
| 690 | |
| 691 | off += scnprintf(buf + off, buf_size - off, |
| 692 | "Ready \t%c\n", |
| 693 | (mw->peer) ? 'Y' : 'N'); |
| 694 | |
| 695 | off += scnprintf(buf + off, buf_size - off, |
| 696 | "Allocated Size \t%zd\n", |
| 697 | (mw->peer) ? (size_t)mw->size : 0); |
| 698 | |
| 699 | ret = simple_read_from_buffer(ubuf, size, offp, buf, off); |
| 700 | kfree(buf); |
| 701 | return ret; |
| 702 | } |
| 703 | |
| 704 | static ssize_t tool_peer_mw_trans_write(struct file *filep, |
| 705 | const char __user *ubuf, |
| 706 | size_t size, loff_t *offp) |
| 707 | { |
| 708 | struct tool_mw *mw = filep->private_data; |
| 709 | |
| 710 | char buf[32]; |
| 711 | size_t buf_size; |
| 712 | unsigned long long val; |
| 713 | int rc; |
| 714 | |
| 715 | buf_size = min(size, (sizeof(buf) - 1)); |
| 716 | if (copy_from_user(buf, ubuf, buf_size)) |
| 717 | return -EFAULT; |
| 718 | |
| 719 | buf[buf_size] = '\0'; |
| 720 | |
| 721 | rc = kstrtoull(buf, 0, &val); |
| 722 | if (rc) |
| 723 | return rc; |
| 724 | |
| 725 | tool_free_mw(mw->tc, mw->idx); |
| 726 | if (val) |
| 727 | rc = tool_setup_mw(mw->tc, mw->idx, val); |
| 728 | |
| 729 | if (rc) |
| 730 | return rc; |
| 731 | |
| 732 | return size; |
| 733 | } |
| 734 | |
| 735 | static TOOL_FOPS_RDWR(tool_peer_mw_trans_fops, |
| 736 | tool_peer_mw_trans_read, |
| 737 | tool_peer_mw_trans_write); |
| 738 | |
| 739 | static int tool_init_mw(struct tool_ctx *tc, int idx) |
| 740 | { |
| 741 | struct tool_mw *mw = &tc->mws[idx]; |
| 742 | phys_addr_t base; |
| 743 | int rc; |
| 744 | |
| 745 | rc = ntb_mw_get_range(tc->ntb, idx, &base, &mw->win_size, |
| 746 | NULL, NULL); |
| 747 | if (rc) |
| 748 | return rc; |
| 749 | |
| 750 | mw->tc = tc; |
| 751 | mw->idx = idx; |
| 752 | mw->local = ioremap_wc(base, mw->win_size); |
| 753 | if (!mw->local) |
| 754 | return -EFAULT; |
| 755 | |
| 756 | return 0; |
| 757 | } |
| 758 | |
| 759 | static void tool_free_mws(struct tool_ctx *tc) |
| 760 | { |
| 761 | int i; |
| 762 | |
| 763 | for (i = 0; i < tc->mw_count; i++) { |
| 764 | tool_free_mw(tc, i); |
| 765 | |
| 766 | if (tc->mws[i].local) |
| 767 | iounmap(tc->mws[i].local); |
| 768 | |
| 769 | tc->mws[i].local = NULL; |
| 770 | } |
| 771 | } |
| 772 | |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 773 | static void tool_setup_dbgfs(struct tool_ctx *tc) |
| 774 | { |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 775 | int i; |
| 776 | |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 777 | /* This modules is useless without dbgfs... */ |
| 778 | if (!tool_dbgfs) { |
| 779 | tc->dbgfs = NULL; |
| 780 | return; |
| 781 | } |
| 782 | |
| 783 | tc->dbgfs = debugfs_create_dir(dev_name(&tc->ntb->dev), |
| 784 | tool_dbgfs); |
| 785 | if (!tc->dbgfs) |
| 786 | return; |
| 787 | |
| 788 | debugfs_create_file("db", S_IRUSR | S_IWUSR, tc->dbgfs, |
| 789 | tc, &tool_db_fops); |
| 790 | |
| 791 | debugfs_create_file("mask", S_IRUSR | S_IWUSR, tc->dbgfs, |
| 792 | tc, &tool_mask_fops); |
| 793 | |
| 794 | debugfs_create_file("peer_db", S_IRUSR | S_IWUSR, tc->dbgfs, |
| 795 | tc, &tool_peer_db_fops); |
| 796 | |
| 797 | debugfs_create_file("peer_mask", S_IRUSR | S_IWUSR, tc->dbgfs, |
| 798 | tc, &tool_peer_mask_fops); |
| 799 | |
| 800 | debugfs_create_file("spad", S_IRUSR | S_IWUSR, tc->dbgfs, |
| 801 | tc, &tool_spad_fops); |
| 802 | |
| 803 | debugfs_create_file("peer_spad", S_IRUSR | S_IWUSR, tc->dbgfs, |
| 804 | tc, &tool_peer_spad_fops); |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 805 | |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 806 | for (i = 0; i < tc->mw_count; i++) { |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 807 | char buf[30]; |
| 808 | |
| 809 | snprintf(buf, sizeof(buf), "mw%d", i); |
| 810 | debugfs_create_file(buf, S_IRUSR | S_IWUSR, tc->dbgfs, |
| 811 | &tc->mws[i], &tool_mw_fops); |
| 812 | |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 813 | snprintf(buf, sizeof(buf), "peer_trans%d", i); |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 814 | debugfs_create_file(buf, S_IRUSR | S_IWUSR, tc->dbgfs, |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 815 | &tc->mws[i], &tool_peer_mw_trans_fops); |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 816 | } |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 817 | } |
| 818 | |
| 819 | static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb) |
| 820 | { |
| 821 | struct tool_ctx *tc; |
| 822 | int rc; |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 823 | int i; |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 824 | |
| 825 | if (ntb_db_is_unsafe(ntb)) |
| 826 | dev_dbg(&ntb->dev, "doorbell is unsafe\n"); |
| 827 | |
| 828 | if (ntb_spad_is_unsafe(ntb)) |
| 829 | dev_dbg(&ntb->dev, "scratchpad is unsafe\n"); |
| 830 | |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 831 | tc = kzalloc(sizeof(*tc), GFP_KERNEL); |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 832 | if (!tc) { |
| 833 | rc = -ENOMEM; |
| 834 | goto err_tc; |
| 835 | } |
| 836 | |
| 837 | tc->ntb = ntb; |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 838 | |
| 839 | tc->mw_count = min(ntb_mw_count(tc->ntb), MAX_MWS); |
| 840 | for (i = 0; i < tc->mw_count; i++) { |
| 841 | rc = tool_init_mw(tc, i); |
| 842 | if (rc) |
| 843 | goto err_ctx; |
| 844 | } |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 845 | |
| 846 | tool_setup_dbgfs(tc); |
| 847 | |
| 848 | rc = ntb_set_ctx(ntb, tc, &tool_ops); |
| 849 | if (rc) |
| 850 | goto err_ctx; |
| 851 | |
| 852 | ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); |
| 853 | ntb_link_event(ntb); |
| 854 | |
| 855 | return 0; |
| 856 | |
| 857 | err_ctx: |
Logan Gunthorpe | 717146a | 2016-06-20 13:15:09 -0600 | [diff] [blame^] | 858 | tool_free_mws(tc); |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 859 | debugfs_remove_recursive(tc->dbgfs); |
| 860 | kfree(tc); |
| 861 | err_tc: |
| 862 | return rc; |
| 863 | } |
| 864 | |
| 865 | static void tool_remove(struct ntb_client *self, struct ntb_dev *ntb) |
| 866 | { |
| 867 | struct tool_ctx *tc = ntb->ctx; |
| 868 | |
Logan Gunthorpe | 8b71d28 | 2016-06-03 14:50:33 -0600 | [diff] [blame] | 869 | tool_free_mws(tc); |
| 870 | |
Allen Hubbe | 578b881 | 2015-05-21 02:51:39 -0400 | [diff] [blame] | 871 | ntb_clear_ctx(ntb); |
| 872 | ntb_link_disable(ntb); |
| 873 | |
| 874 | debugfs_remove_recursive(tc->dbgfs); |
| 875 | kfree(tc); |
| 876 | } |
| 877 | |
| 878 | static struct ntb_client tool_client = { |
| 879 | .ops = { |
| 880 | .probe = tool_probe, |
| 881 | .remove = tool_remove, |
| 882 | }, |
| 883 | }; |
| 884 | |
| 885 | static int __init tool_init(void) |
| 886 | { |
| 887 | int rc; |
| 888 | |
| 889 | if (debugfs_initialized()) |
| 890 | tool_dbgfs = debugfs_create_dir(KBUILD_MODNAME, NULL); |
| 891 | |
| 892 | rc = ntb_register_client(&tool_client); |
| 893 | if (rc) |
| 894 | goto err_client; |
| 895 | |
| 896 | return 0; |
| 897 | |
| 898 | err_client: |
| 899 | debugfs_remove_recursive(tool_dbgfs); |
| 900 | return rc; |
| 901 | } |
| 902 | module_init(tool_init); |
| 903 | |
| 904 | static void __exit tool_exit(void) |
| 905 | { |
| 906 | ntb_unregister_client(&tool_client); |
| 907 | debugfs_remove_recursive(tool_dbgfs); |
| 908 | } |
| 909 | module_exit(tool_exit); |