1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * RapidIO mport character device 4 * 5 * Copyright 2014-2015 Integrated Device Technology, Inc. 6 * Alexandre Bounine <alexandre.bounine@idt.com> 7 * Copyright 2014-2015 Prodrive Technologies 8 * Andre van Herk <andre.van.herk@prodrive-technologies.com> 9 * Jerry Jacobs <jerry.jacobs@prodrive-technologies.com> 10 * Copyright (C) 2014 Texas Instruments Incorporated 11 * Aurelien Jacquiot <a-jacquiot@ti.com> 12 */ 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/cdev.h> 16 #include <linux/ioctl.h> 17 #include <linux/uaccess.h> 18 #include <linux/list.h> 19 #include <linux/fs.h> 20 #include <linux/err.h> 21 #include <linux/net.h> 22 #include <linux/poll.h> 23 #include <linux/spinlock.h> 24 #include <linux/sched.h> 25 #include <linux/kfifo.h> 26 27 #include <linux/mm.h> 28 #include <linux/slab.h> 29 #include <linux/vmalloc.h> 30 #include <linux/mman.h> 31 32 #include <linux/dma-mapping.h> 33 #ifdef CONFIG_RAPIDIO_DMA_ENGINE 34 #include <linux/dmaengine.h> 35 #endif 36 37 #include <linux/rio.h> 38 #include <linux/rio_ids.h> 39 #include <linux/rio_drv.h> 40 #include <linux/rio_mport_cdev.h> 41 42 #include "../rio.h" 43 44 #define DRV_NAME "rio_mport" 45 #define DRV_PREFIX DRV_NAME ": " 46 #define DEV_NAME "rio_mport" 47 #define DRV_VERSION "1.0.0" 48 49 /* Debug output filtering masks */ 50 enum { 51 DBG_NONE = 0, 52 DBG_INIT = BIT(0), /* driver init */ 53 DBG_EXIT = BIT(1), /* driver exit */ 54 DBG_MPORT = BIT(2), /* mport add/remove */ 55 DBG_RDEV = BIT(3), /* RapidIO device add/remove */ 56 DBG_DMA = BIT(4), /* DMA transfer messages */ 57 DBG_MMAP = BIT(5), /* mapping messages */ 58 DBG_IBW = BIT(6), /* inbound window */ 59 DBG_EVENT = BIT(7), /* event handling messages */ 60 DBG_OBW = BIT(8), /* outbound window messages */ 61 DBG_DBELL = BIT(9), /* doorbell messages */ 62 DBG_ALL = ~0, 63 }; 64 65 #ifdef DEBUG 66 #define rmcd_debug(level, fmt, arg...) \ 67 do { \ 68 if (DBG_##level & dbg_level) \ 69 pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \ 70 } while (0) 71 #else 72 #define rmcd_debug(level, fmt, arg...) \ 73 no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg) 74 #endif 75 76 #define rmcd_warn(fmt, arg...) \ 77 pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg) 78 79 #define rmcd_error(fmt, arg...) \ 80 pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg) 81 82 MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>"); 83 MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>"); 84 MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>"); 85 MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>"); 86 MODULE_DESCRIPTION("RapidIO mport character device driver"); 87 MODULE_LICENSE("GPL"); 88 MODULE_VERSION(DRV_VERSION); 89 90 static int dma_timeout = 3000; /* DMA transfer timeout in msec */ 91 module_param(dma_timeout, int, S_IRUGO); 92 MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)"); 93 94 #ifdef DEBUG 95 static u32 dbg_level = DBG_NONE; 96 module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO); 97 MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)"); 98 #endif 99 100 /* 101 * An internal DMA coherent buffer 102 */ 103 struct mport_dma_buf { 104 void *ib_base; 105 dma_addr_t ib_phys; 106 u32 ib_size; 107 u64 ib_rio_base; 108 bool ib_map; 109 struct file *filp; 110 }; 111 112 /* 113 * Internal memory mapping structure 114 */ 115 enum rio_mport_map_dir { 116 MAP_INBOUND, 117 MAP_OUTBOUND, 118 MAP_DMA, 119 }; 120 121 struct rio_mport_mapping { 122 struct list_head node; 123 struct mport_dev *md; 124 enum rio_mport_map_dir dir; 125 u16 rioid; 126 u64 rio_addr; 127 dma_addr_t phys_addr; /* for mmap */ 128 void *virt_addr; /* kernel address, for dma_free_coherent */ 129 u64 size; 130 struct kref ref; /* refcount of vmas sharing the mapping */ 131 struct file *filp; 132 }; 133 134 struct rio_mport_dma_map { 135 int valid; 136 u64 length; 137 void *vaddr; 138 dma_addr_t paddr; 139 }; 140 141 #define MPORT_MAX_DMA_BUFS 16 142 #define MPORT_EVENT_DEPTH 10 143 144 /* 145 * mport_dev driver-specific structure that represents mport device 146 * @active mport device status flag 147 * @node list node to maintain list of registered mports 148 * @cdev character device 149 * @dev associated device object 150 * @mport associated subsystem's master port device object 151 * @buf_mutex lock for buffer handling 152 * @file_mutex - lock for open files list 153 * @file_list - list of open files on given mport 154 * @properties properties of this mport 155 * @portwrites queue of inbound portwrites 156 * @pw_lock lock for port write queue 157 * @mappings queue for memory mappings 158 * @dma_chan DMA channels associated with this device 159 * @dma_ref: 160 * @comp: 161 */ 162 struct mport_dev { 163 atomic_t active; 164 struct list_head node; 165 struct cdev cdev; 166 struct device dev; 167 struct rio_mport *mport; 168 struct mutex buf_mutex; 169 struct mutex file_mutex; 170 struct list_head file_list; 171 struct rio_mport_properties properties; 172 struct list_head doorbells; 173 spinlock_t db_lock; 174 struct list_head portwrites; 175 spinlock_t pw_lock; 176 struct list_head mappings; 177 #ifdef CONFIG_RAPIDIO_DMA_ENGINE 178 struct dma_chan *dma_chan; 179 struct kref dma_ref; 180 struct completion comp; 181 #endif 182 }; 183 184 /* 185 * mport_cdev_priv - data structure specific to individual file object 186 * associated with an open device 187 * @md master port character device object 188 * @async_queue - asynchronous notification queue 189 * @list - file objects tracking list 190 * @db_filters inbound doorbell filters for this descriptor 191 * @pw_filters portwrite filters for this descriptor 192 * @event_fifo event fifo for this descriptor 193 * @event_rx_wait wait queue for this descriptor 194 * @fifo_lock lock for event_fifo 195 * @event_mask event mask for this descriptor 196 * @dmach DMA engine channel allocated for specific file object 197 */ 198 struct mport_cdev_priv { 199 struct mport_dev *md; 200 struct fasync_struct *async_queue; 201 struct list_head list; 202 struct list_head db_filters; 203 struct list_head pw_filters; 204 struct kfifo event_fifo; 205 wait_queue_head_t event_rx_wait; 206 spinlock_t fifo_lock; 207 u32 event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */ 208 #ifdef CONFIG_RAPIDIO_DMA_ENGINE 209 struct dma_chan *dmach; 210 struct list_head async_list; 211 spinlock_t req_lock; 212 struct mutex dma_lock; 213 struct kref dma_ref; 214 struct completion comp; 215 #endif 216 }; 217 218 /* 219 * rio_mport_pw_filter - structure to describe a portwrite filter 220 * md_node node in mport device's list 221 * priv_node node in private file object's list 222 * priv reference to private data 223 * filter actual portwrite filter 224 */ 225 struct rio_mport_pw_filter { 226 struct list_head md_node; 227 struct list_head priv_node; 228 struct mport_cdev_priv *priv; 229 struct rio_pw_filter filter; 230 }; 231 232 /* 233 * rio_mport_db_filter - structure to describe a doorbell filter 234 * @data_node reference to device node 235 * @priv_node node in private data 236 * @priv reference to private data 237 * @filter actual doorbell filter 238 */ 239 struct rio_mport_db_filter { 240 struct list_head data_node; 241 struct list_head priv_node; 242 struct mport_cdev_priv *priv; 243 struct rio_doorbell_filter filter; 244 }; 245 246 static LIST_HEAD(mport_devs); 247 static DEFINE_MUTEX(mport_devs_lock); 248 249 #if (0) /* used by commented out portion of poll function : FIXME */ 250 static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait); 251 #endif 252 253 static const struct class dev_class = { 254 .name = DRV_NAME, 255 }; 256 static dev_t dev_number; 257 258 static void mport_release_mapping(struct kref *ref); 259 260 static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg, 261 int local) 262 { 263 struct rio_mport *mport = priv->md->mport; 264 struct rio_mport_maint_io maint_io; 265 u32 *buffer; 266 u32 offset; 267 size_t length; 268 int ret, i; 269 270 if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io)))) 271 return -EFAULT; 272 273 if ((maint_io.offset % 4) || 274 (maint_io.length == 0) || (maint_io.length % 4) || 275 (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ) 276 return -EINVAL; 277 278 buffer = vmalloc(maint_io.length); 279 if (buffer == NULL) 280 return -ENOMEM; 281 length = maint_io.length/sizeof(u32); 282 offset = maint_io.offset; 283 284 for (i = 0; i < length; i++) { 285 if (local) 286 ret = __rio_local_read_config_32(mport, 287 offset, &buffer[i]); 288 else 289 ret = rio_mport_read_config_32(mport, maint_io.rioid, 290 maint_io.hopcount, offset, &buffer[i]); 291 if (ret) 292 goto out; 293 294 offset += 4; 295 } 296 297 if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer, 298 buffer, maint_io.length))) 299 ret = -EFAULT; 300 out: 301 vfree(buffer); 302 return ret; 303 } 304 305 static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg, 306 int local) 307 { 308 struct rio_mport *mport = priv->md->mport; 309 struct rio_mport_maint_io maint_io; 310 u32 *buffer; 311 u32 offset; 312 size_t length; 313 int ret = -EINVAL, i; 314 315 if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io)))) 316 return -EFAULT; 317 318 if ((maint_io.offset % 4) || 319 (maint_io.length == 0) || (maint_io.length % 4) || 320 (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ) 321 return -EINVAL; 322 323 buffer = vmalloc(maint_io.length); 324 if (buffer == NULL) 325 return -ENOMEM; 326 length = maint_io.length; 327 328 if (unlikely(copy_from_user(buffer, 329 (void __user *)(uintptr_t)maint_io.buffer, length))) { 330 ret = -EFAULT; 331 goto out; 332 } 333 334 offset = maint_io.offset; 335 length /= sizeof(u32); 336 337 for (i = 0; i < length; i++) { 338 if (local) 339 ret = __rio_local_write_config_32(mport, 340 offset, buffer[i]); 341 else 342 ret = rio_mport_write_config_32(mport, maint_io.rioid, 343 maint_io.hopcount, 344 offset, buffer[i]); 345 if (ret) 346 goto out; 347 348 offset += 4; 349 } 350 351 out: 352 vfree(buffer); 353 return ret; 354 } 355 356 357 /* 358 * Inbound/outbound memory mapping functions 359 */ 360 static int 361 rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp, 362 u16 rioid, u64 raddr, u32 size, 363 dma_addr_t *paddr) 364 { 365 struct rio_mport *mport = md->mport; 366 struct rio_mport_mapping *map; 367 int ret; 368 369 rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size); 370 371 map = kzalloc(sizeof(*map), GFP_KERNEL); 372 if (map == NULL) 373 return -ENOMEM; 374 375 ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr); 376 if (ret < 0) 377 goto err_map_outb; 378 379 map->dir = MAP_OUTBOUND; 380 map->rioid = rioid; 381 map->rio_addr = raddr; 382 map->size = size; 383 map->phys_addr = *paddr; 384 map->filp = filp; 385 map->md = md; 386 kref_init(&map->ref); 387 list_add_tail(&map->node, &md->mappings); 388 return 0; 389 err_map_outb: 390 kfree(map); 391 return ret; 392 } 393 394 static int 395 rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp, 396 u16 rioid, u64 raddr, u32 size, 397 dma_addr_t *paddr) 398 { 399 struct rio_mport_mapping *map; 400 int err = -ENOMEM; 401 402 mutex_lock(&md->buf_mutex); 403 list_for_each_entry(map, &md->mappings, node) { 404 if (map->dir != MAP_OUTBOUND) 405 continue; 406 if (rioid == map->rioid && 407 raddr == map->rio_addr && size == map->size) { 408 *paddr = map->phys_addr; 409 err = 0; 410 break; 411 } else if (rioid == map->rioid && 412 raddr < (map->rio_addr + map->size - 1) && 413 (raddr + size) > map->rio_addr) { 414 err = -EBUSY; 415 break; 416 } 417 } 418 419 /* If not found, create new */ 420 if (err == -ENOMEM) 421 err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr, 422 size, paddr); 423 mutex_unlock(&md->buf_mutex); 424 return err; 425 } 426 427 static int rio_mport_obw_map(struct file *filp, void __user *arg) 428 { 429 struct mport_cdev_priv *priv = filp->private_data; 430 struct mport_dev *data = priv->md; 431 struct rio_mmap map; 432 dma_addr_t paddr; 433 int ret; 434 435 if (unlikely(copy_from_user(&map, arg, sizeof(map)))) 436 return -EFAULT; 437 438 rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx", 439 map.rioid, map.rio_addr, map.length); 440 441 ret = rio_mport_get_outbound_mapping(data, filp, map.rioid, 442 map.rio_addr, map.length, &paddr); 443 if (ret < 0) { 444 rmcd_error("Failed to set OBW err= %d", ret); 445 return ret; 446 } 447 448 map.handle = paddr; 449 450 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) 451 return -EFAULT; 452 return 0; 453 } 454 455 /* 456 * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space 457 * 458 * @priv: driver private data 459 * @arg: buffer handle returned by allocation routine 460 */ 461 static int rio_mport_obw_free(struct file *filp, void __user *arg) 462 { 463 struct mport_cdev_priv *priv = filp->private_data; 464 struct mport_dev *md = priv->md; 465 u64 handle; 466 struct rio_mport_mapping *map, *_map; 467 468 if (!md->mport->ops->unmap_outb) 469 return -EPROTONOSUPPORT; 470 471 if (copy_from_user(&handle, arg, sizeof(handle))) 472 return -EFAULT; 473 474 rmcd_debug(OBW, "h=0x%llx", handle); 475 476 mutex_lock(&md->buf_mutex); 477 list_for_each_entry_safe(map, _map, &md->mappings, node) { 478 if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) { 479 if (map->filp == filp) { 480 rmcd_debug(OBW, "kref_put h=0x%llx", handle); 481 map->filp = NULL; 482 kref_put(&map->ref, mport_release_mapping); 483 } 484 break; 485 } 486 } 487 mutex_unlock(&md->buf_mutex); 488 489 return 0; 490 } 491 492 /* 493 * maint_hdid_set() - Set the host Device ID 494 * @priv: driver private data 495 * @arg: Device Id 496 */ 497 static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg) 498 { 499 struct mport_dev *md = priv->md; 500 u16 hdid; 501 502 if (copy_from_user(&hdid, arg, sizeof(hdid))) 503 return -EFAULT; 504 505 md->mport->host_deviceid = hdid; 506 md->properties.hdid = hdid; 507 rio_local_set_device_id(md->mport, hdid); 508 509 rmcd_debug(MPORT, "Set host device Id to %d", hdid); 510 511 return 0; 512 } 513 514 /* 515 * maint_comptag_set() - Set the host Component Tag 516 * @priv: driver private data 517 * @arg: Component Tag 518 */ 519 static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg) 520 { 521 struct mport_dev *md = priv->md; 522 u32 comptag; 523 524 if (copy_from_user(&comptag, arg, sizeof(comptag))) 525 return -EFAULT; 526 527 rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag); 528 529 rmcd_debug(MPORT, "Set host Component Tag to %d", comptag); 530 531 return 0; 532 } 533 534 #ifdef CONFIG_RAPIDIO_DMA_ENGINE 535 536 struct mport_dma_req { 537 struct kref refcount; 538 struct list_head node; 539 struct file *filp; 540 struct mport_cdev_priv *priv; 541 enum rio_transfer_sync sync; 542 struct sg_table sgt; 543 struct page **page_list; 544 unsigned int nr_pages; 545 struct rio_mport_mapping *map; 546 struct dma_chan *dmach; 547 enum dma_data_direction dir; 548 dma_cookie_t cookie; 549 enum dma_status status; 550 struct completion req_comp; 551 }; 552 553 static void mport_release_def_dma(struct kref *dma_ref) 554 { 555 struct mport_dev *md = 556 container_of(dma_ref, struct mport_dev, dma_ref); 557 558 rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id); 559 rio_release_dma(md->dma_chan); 560 md->dma_chan = NULL; 561 } 562 563 static void mport_release_dma(struct kref *dma_ref) 564 { 565 struct mport_cdev_priv *priv = 566 container_of(dma_ref, struct mport_cdev_priv, dma_ref); 567 568 rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id); 569 complete(&priv->comp); 570 } 571 572 static void dma_req_free(struct kref *ref) 573 { 574 struct mport_dma_req *req = container_of(ref, struct mport_dma_req, 575 refcount); 576 struct mport_cdev_priv *priv = req->priv; 577 578 dma_unmap_sg(req->dmach->device->dev, 579 req->sgt.sgl, req->sgt.nents, req->dir); 580 sg_free_table(&req->sgt); 581 if (req->page_list) { 582 unpin_user_pages(req->page_list, req->nr_pages); 583 kfree(req->page_list); 584 } 585 586 if (req->map) { 587 mutex_lock(&req->map->md->buf_mutex); 588 kref_put(&req->map->ref, mport_release_mapping); 589 mutex_unlock(&req->map->md->buf_mutex); 590 } 591 592 kref_put(&priv->dma_ref, mport_release_dma); 593 594 kfree(req); 595 } 596 597 static void dma_xfer_callback(void *param) 598 { 599 struct mport_dma_req *req = (struct mport_dma_req *)param; 600 struct mport_cdev_priv *priv = req->priv; 601 602 req->status = dma_async_is_tx_complete(priv->dmach, req->cookie, 603 NULL, NULL); 604 complete(&req->req_comp); 605 kref_put(&req->refcount, dma_req_free); 606 } 607 608 /* 609 * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA 610 * transfer object. 611 * Returns pointer to DMA transaction descriptor allocated by DMA driver on 612 * success or ERR_PTR (and/or NULL) if failed. Caller must check returned 613 * non-NULL pointer using IS_ERR macro. 614 */ 615 static struct dma_async_tx_descriptor 616 *prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer, 617 struct sg_table *sgt, int nents, enum dma_transfer_direction dir, 618 enum dma_ctrl_flags flags) 619 { 620 struct rio_dma_data tx_data; 621 622 tx_data.sg = sgt->sgl; 623 tx_data.sg_len = nents; 624 tx_data.rio_addr_u = 0; 625 tx_data.rio_addr = transfer->rio_addr; 626 if (dir == DMA_MEM_TO_DEV) { 627 switch (transfer->method) { 628 case RIO_EXCHANGE_NWRITE: 629 tx_data.wr_type = RDW_ALL_NWRITE; 630 break; 631 case RIO_EXCHANGE_NWRITE_R_ALL: 632 tx_data.wr_type = RDW_ALL_NWRITE_R; 633 break; 634 case RIO_EXCHANGE_NWRITE_R: 635 tx_data.wr_type = RDW_LAST_NWRITE_R; 636 break; 637 case RIO_EXCHANGE_DEFAULT: 638 tx_data.wr_type = RDW_DEFAULT; 639 break; 640 default: 641 return ERR_PTR(-EINVAL); 642 } 643 } 644 645 return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags); 646 } 647 648 /* Request DMA channel associated with this mport device. 649 * Try to request DMA channel for every new process that opened given 650 * mport. If a new DMA channel is not available use default channel 651 * which is the first DMA channel opened on mport device. 652 */ 653 static int get_dma_channel(struct mport_cdev_priv *priv) 654 { 655 mutex_lock(&priv->dma_lock); 656 if (!priv->dmach) { 657 priv->dmach = rio_request_mport_dma(priv->md->mport); 658 if (!priv->dmach) { 659 /* Use default DMA channel if available */ 660 if (priv->md->dma_chan) { 661 priv->dmach = priv->md->dma_chan; 662 kref_get(&priv->md->dma_ref); 663 } else { 664 rmcd_error("Failed to get DMA channel"); 665 mutex_unlock(&priv->dma_lock); 666 return -ENODEV; 667 } 668 } else if (!priv->md->dma_chan) { 669 /* Register default DMA channel if we do not have one */ 670 priv->md->dma_chan = priv->dmach; 671 kref_init(&priv->md->dma_ref); 672 rmcd_debug(DMA, "Register DMA_chan %d as default", 673 priv->dmach->chan_id); 674 } 675 676 kref_init(&priv->dma_ref); 677 init_completion(&priv->comp); 678 } 679 680 kref_get(&priv->dma_ref); 681 mutex_unlock(&priv->dma_lock); 682 return 0; 683 } 684 685 static void put_dma_channel(struct mport_cdev_priv *priv) 686 { 687 kref_put(&priv->dma_ref, mport_release_dma); 688 } 689 690 /* 691 * DMA transfer functions 692 */ 693 static int do_dma_request(struct mport_dma_req *req, 694 struct rio_transfer_io *xfer, 695 enum rio_transfer_sync sync, int nents) 696 { 697 struct mport_cdev_priv *priv; 698 struct sg_table *sgt; 699 struct dma_chan *chan; 700 struct dma_async_tx_descriptor *tx; 701 dma_cookie_t cookie; 702 unsigned long tmo = msecs_to_jiffies(dma_timeout); 703 enum dma_transfer_direction dir; 704 long wret; 705 int ret = 0; 706 707 priv = req->priv; 708 sgt = &req->sgt; 709 710 chan = priv->dmach; 711 dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; 712 713 rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s", 714 current->comm, task_pid_nr(current), 715 dev_name(&chan->dev->device), 716 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE"); 717 718 /* Initialize DMA transaction request */ 719 tx = prep_dma_xfer(chan, xfer, sgt, nents, dir, 720 DMA_CTRL_ACK | DMA_PREP_INTERRUPT); 721 722 if (!tx) { 723 rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx", 724 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", 725 xfer->rio_addr, xfer->length); 726 ret = -EIO; 727 goto err_out; 728 } else if (IS_ERR(tx)) { 729 ret = PTR_ERR(tx); 730 rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret, 731 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", 732 xfer->rio_addr, xfer->length); 733 goto err_out; 734 } 735 736 tx->callback = dma_xfer_callback; 737 tx->callback_param = req; 738 739 req->status = DMA_IN_PROGRESS; 740 kref_get(&req->refcount); 741 742 cookie = dmaengine_submit(tx); 743 req->cookie = cookie; 744 745 rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current), 746 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie); 747 748 if (dma_submit_error(cookie)) { 749 rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)", 750 cookie, xfer->rio_addr, xfer->length); 751 kref_put(&req->refcount, dma_req_free); 752 ret = -EIO; 753 goto err_out; 754 } 755 756 dma_async_issue_pending(chan); 757 758 if (sync == RIO_TRANSFER_ASYNC) { 759 spin_lock(&priv->req_lock); 760 list_add_tail(&req->node, &priv->async_list); 761 spin_unlock(&priv->req_lock); 762 return cookie; 763 } else if (sync == RIO_TRANSFER_FAF) 764 return 0; 765 766 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo); 767 768 if (wret == 0) { 769 /* Timeout on wait occurred */ 770 rmcd_error("%s(%d) timed out waiting for DMA_%s %d", 771 current->comm, task_pid_nr(current), 772 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie); 773 return -ETIMEDOUT; 774 } else if (wret == -ERESTARTSYS) { 775 /* Wait_for_completion was interrupted by a signal but DMA may 776 * be in progress 777 */ 778 rmcd_error("%s(%d) wait for DMA_%s %d was interrupted", 779 current->comm, task_pid_nr(current), 780 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie); 781 return -EINTR; 782 } 783 784 if (req->status != DMA_COMPLETE) { 785 /* DMA transaction completion was signaled with error */ 786 rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)", 787 current->comm, task_pid_nr(current), 788 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", 789 cookie, req->status, ret); 790 ret = -EIO; 791 } 792 793 err_out: 794 return ret; 795 } 796 797 /* 798 * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from 799 * the remote RapidIO device 800 * @filp: file pointer associated with the call 801 * @transfer_mode: DMA transfer mode 802 * @sync: synchronization mode 803 * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR 804 * DMA_DEV_TO_MEM = read) 805 * @xfer: data transfer descriptor structure 806 */ 807 static int 808 rio_dma_transfer(struct file *filp, u32 transfer_mode, 809 enum rio_transfer_sync sync, enum dma_data_direction dir, 810 struct rio_transfer_io *xfer) 811 { 812 struct mport_cdev_priv *priv = filp->private_data; 813 unsigned long nr_pages = 0; 814 struct page **page_list = NULL; 815 struct mport_dma_req *req; 816 struct mport_dev *md = priv->md; 817 struct dma_chan *chan; 818 int ret; 819 int nents; 820 821 if (xfer->length == 0) 822 return -EINVAL; 823 req = kzalloc(sizeof(*req), GFP_KERNEL); 824 if (!req) 825 return -ENOMEM; 826 827 ret = get_dma_channel(priv); 828 if (ret) { 829 kfree(req); 830 return ret; 831 } 832 chan = priv->dmach; 833 834 kref_init(&req->refcount); 835 init_completion(&req->req_comp); 836 req->dir = dir; 837 req->filp = filp; 838 req->priv = priv; 839 req->dmach = chan; 840 req->sync = sync; 841 842 /* 843 * If parameter loc_addr != NULL, we are transferring data from/to 844 * data buffer allocated in user-space: lock in memory user-space 845 * buffer pages and build an SG table for DMA transfer request 846 * 847 * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is 848 * used for DMA data transfers: build single entry SG table using 849 * offset within the internal buffer specified by handle parameter. 850 */ 851 if (xfer->loc_addr) { 852 unsigned int offset; 853 long pinned; 854 855 offset = lower_32_bits(offset_in_page(xfer->loc_addr)); 856 nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT; 857 858 page_list = kmalloc_array(nr_pages, 859 sizeof(*page_list), GFP_KERNEL); 860 if (page_list == NULL) { 861 ret = -ENOMEM; 862 goto err_req; 863 } 864 865 pinned = pin_user_pages_fast( 866 (unsigned long)xfer->loc_addr & PAGE_MASK, 867 nr_pages, 868 dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0, 869 page_list); 870 871 if (pinned != nr_pages) { 872 if (pinned < 0) { 873 rmcd_error("pin_user_pages_fast err=%ld", 874 pinned); 875 nr_pages = 0; 876 } else { 877 rmcd_error("pinned %ld out of %ld pages", 878 pinned, nr_pages); 879 /* 880 * Set nr_pages up to mean "how many pages to unpin, in 881 * the error handler: 882 */ 883 nr_pages = pinned; 884 } 885 ret = -EFAULT; 886 goto err_pg; 887 } 888 889 ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages, 890 offset, xfer->length, GFP_KERNEL); 891 if (ret) { 892 rmcd_error("sg_alloc_table failed with err=%d", ret); 893 goto err_pg; 894 } 895 896 req->page_list = page_list; 897 req->nr_pages = nr_pages; 898 } else { 899 dma_addr_t baddr; 900 struct rio_mport_mapping *map; 901 902 baddr = (dma_addr_t)xfer->handle; 903 904 mutex_lock(&md->buf_mutex); 905 list_for_each_entry(map, &md->mappings, node) { 906 if (baddr >= map->phys_addr && 907 baddr < (map->phys_addr + map->size)) { 908 kref_get(&map->ref); 909 req->map = map; 910 break; 911 } 912 } 913 mutex_unlock(&md->buf_mutex); 914 915 if (req->map == NULL) { 916 ret = -ENOMEM; 917 goto err_req; 918 } 919 920 if (xfer->length + xfer->offset > req->map->size) { 921 ret = -EINVAL; 922 goto err_req; 923 } 924 925 ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL); 926 if (unlikely(ret)) { 927 rmcd_error("sg_alloc_table failed for internal buf"); 928 goto err_req; 929 } 930 931 sg_set_buf(req->sgt.sgl, 932 req->map->virt_addr + (baddr - req->map->phys_addr) + 933 xfer->offset, xfer->length); 934 } 935 936 nents = dma_map_sg(chan->device->dev, 937 req->sgt.sgl, req->sgt.nents, dir); 938 if (nents == 0) { 939 rmcd_error("Failed to map SG list"); 940 ret = -EFAULT; 941 goto err_pg; 942 } 943 944 ret = do_dma_request(req, xfer, sync, nents); 945 946 if (ret >= 0) { 947 if (sync == RIO_TRANSFER_ASYNC) 948 return ret; /* return ASYNC cookie */ 949 } else { 950 rmcd_debug(DMA, "do_dma_request failed with err=%d", ret); 951 } 952 953 err_pg: 954 if (!req->page_list) { 955 unpin_user_pages(page_list, nr_pages); 956 kfree(page_list); 957 } 958 err_req: 959 kref_put(&req->refcount, dma_req_free); 960 return ret; 961 } 962 963 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg) 964 { 965 struct mport_cdev_priv *priv = filp->private_data; 966 struct rio_transaction transaction; 967 struct rio_transfer_io *transfer; 968 enum dma_data_direction dir; 969 int i, ret = 0; 970 size_t size; 971 972 if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction)))) 973 return -EFAULT; 974 975 if (transaction.count != 1) /* only single transfer for now */ 976 return -EINVAL; 977 978 if ((transaction.transfer_mode & 979 priv->md->properties.transfer_mode) == 0) 980 return -ENODEV; 981 982 size = array_size(sizeof(*transfer), transaction.count); 983 transfer = vmalloc(size); 984 if (!transfer) 985 return -ENOMEM; 986 987 if (unlikely(copy_from_user(transfer, 988 (void __user *)(uintptr_t)transaction.block, 989 size))) { 990 ret = -EFAULT; 991 goto out_free; 992 } 993 994 dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ? 995 DMA_FROM_DEVICE : DMA_TO_DEVICE; 996 for (i = 0; i < transaction.count && ret == 0; i++) 997 ret = rio_dma_transfer(filp, transaction.transfer_mode, 998 transaction.sync, dir, &transfer[i]); 999 1000 if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block, 1001 transfer, size))) 1002 ret = -EFAULT; 1003 1004 out_free: 1005 vfree(transfer); 1006 1007 return ret; 1008 } 1009 1010 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg) 1011 { 1012 struct mport_cdev_priv *priv; 1013 struct rio_async_tx_wait w_param; 1014 struct mport_dma_req *req; 1015 dma_cookie_t cookie; 1016 unsigned long tmo; 1017 long wret; 1018 int found = 0; 1019 int ret; 1020 1021 priv = (struct mport_cdev_priv *)filp->private_data; 1022 1023 if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param)))) 1024 return -EFAULT; 1025 1026 cookie = w_param.token; 1027 if (w_param.timeout) 1028 tmo = msecs_to_jiffies(w_param.timeout); 1029 else /* Use default DMA timeout */ 1030 tmo = msecs_to_jiffies(dma_timeout); 1031 1032 spin_lock(&priv->req_lock); 1033 list_for_each_entry(req, &priv->async_list, node) { 1034 if (req->cookie == cookie) { 1035 list_del(&req->node); 1036 found = 1; 1037 break; 1038 } 1039 } 1040 spin_unlock(&priv->req_lock); 1041 1042 if (!found) 1043 return -EAGAIN; 1044 1045 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo); 1046 1047 if (wret == 0) { 1048 /* Timeout on wait occurred */ 1049 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s", 1050 current->comm, task_pid_nr(current), 1051 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE"); 1052 ret = -ETIMEDOUT; 1053 goto err_tmo; 1054 } else if (wret == -ERESTARTSYS) { 1055 /* Wait_for_completion was interrupted by a signal but DMA may 1056 * be still in progress 1057 */ 1058 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted", 1059 current->comm, task_pid_nr(current), 1060 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE"); 1061 ret = -EINTR; 1062 goto err_tmo; 1063 } 1064 1065 if (req->status != DMA_COMPLETE) { 1066 /* DMA transaction completion signaled with transfer error */ 1067 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d", 1068 current->comm, task_pid_nr(current), 1069 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE", 1070 req->status); 1071 ret = -EIO; 1072 } else 1073 ret = 0; 1074 1075 if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED) 1076 kref_put(&req->refcount, dma_req_free); 1077 1078 return ret; 1079 1080 err_tmo: 1081 /* Return request back into async queue */ 1082 spin_lock(&priv->req_lock); 1083 list_add_tail(&req->node, &priv->async_list); 1084 spin_unlock(&priv->req_lock); 1085 return ret; 1086 } 1087 1088 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp, 1089 u64 size, struct rio_mport_mapping **mapping) 1090 { 1091 struct rio_mport_mapping *map; 1092 1093 map = kzalloc(sizeof(*map), GFP_KERNEL); 1094 if (map == NULL) 1095 return -ENOMEM; 1096 1097 map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size, 1098 &map->phys_addr, GFP_KERNEL); 1099 if (map->virt_addr == NULL) { 1100 kfree(map); 1101 return -ENOMEM; 1102 } 1103 1104 map->dir = MAP_DMA; 1105 map->size = size; 1106 map->filp = filp; 1107 map->md = md; 1108 kref_init(&map->ref); 1109 mutex_lock(&md->buf_mutex); 1110 list_add_tail(&map->node, &md->mappings); 1111 mutex_unlock(&md->buf_mutex); 1112 *mapping = map; 1113 1114 return 0; 1115 } 1116 1117 static int rio_mport_alloc_dma(struct file *filp, void __user *arg) 1118 { 1119 struct mport_cdev_priv *priv = filp->private_data; 1120 struct mport_dev *md = priv->md; 1121 struct rio_dma_mem map; 1122 struct rio_mport_mapping *mapping = NULL; 1123 int ret; 1124 1125 if (unlikely(copy_from_user(&map, arg, sizeof(map)))) 1126 return -EFAULT; 1127 1128 ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping); 1129 if (ret) 1130 return ret; 1131 1132 map.dma_handle = mapping->phys_addr; 1133 1134 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) { 1135 mutex_lock(&md->buf_mutex); 1136 kref_put(&mapping->ref, mport_release_mapping); 1137 mutex_unlock(&md->buf_mutex); 1138 return -EFAULT; 1139 } 1140 1141 return 0; 1142 } 1143 1144 static int rio_mport_free_dma(struct file *filp, void __user *arg) 1145 { 1146 struct mport_cdev_priv *priv = filp->private_data; 1147 struct mport_dev *md = priv->md; 1148 u64 handle; 1149 int ret = -EFAULT; 1150 struct rio_mport_mapping *map, *_map; 1151 1152 if (copy_from_user(&handle, arg, sizeof(handle))) 1153 return -EFAULT; 1154 rmcd_debug(EXIT, "filp=%p", filp); 1155 1156 mutex_lock(&md->buf_mutex); 1157 list_for_each_entry_safe(map, _map, &md->mappings, node) { 1158 if (map->dir == MAP_DMA && map->phys_addr == handle && 1159 map->filp == filp) { 1160 kref_put(&map->ref, mport_release_mapping); 1161 ret = 0; 1162 break; 1163 } 1164 } 1165 mutex_unlock(&md->buf_mutex); 1166 1167 if (ret == -EFAULT) { 1168 rmcd_debug(DMA, "ERR no matching mapping"); 1169 return ret; 1170 } 1171 1172 return 0; 1173 } 1174 #else 1175 static int rio_mport_transfer_ioctl(struct file *filp, void *arg) 1176 { 1177 return -ENODEV; 1178 } 1179 1180 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg) 1181 { 1182 return -ENODEV; 1183 } 1184 1185 static int rio_mport_alloc_dma(struct file *filp, void __user *arg) 1186 { 1187 return -ENODEV; 1188 } 1189 1190 static int rio_mport_free_dma(struct file *filp, void __user *arg) 1191 { 1192 return -ENODEV; 1193 } 1194 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */ 1195 1196 /* 1197 * Inbound/outbound memory mapping functions 1198 */ 1199 1200 static int 1201 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp, 1202 u64 raddr, u64 size, 1203 struct rio_mport_mapping **mapping) 1204 { 1205 struct rio_mport *mport = md->mport; 1206 struct rio_mport_mapping *map; 1207 int ret; 1208 1209 /* rio_map_inb_region() accepts u32 size */ 1210 if (size > 0xffffffff) 1211 return -EINVAL; 1212 1213 map = kzalloc(sizeof(*map), GFP_KERNEL); 1214 if (map == NULL) 1215 return -ENOMEM; 1216 1217 map->virt_addr = dma_alloc_coherent(mport->dev.parent, size, 1218 &map->phys_addr, GFP_KERNEL); 1219 if (map->virt_addr == NULL) { 1220 ret = -ENOMEM; 1221 goto err_dma_alloc; 1222 } 1223 1224 if (raddr == RIO_MAP_ANY_ADDR) 1225 raddr = map->phys_addr; 1226 ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0); 1227 if (ret < 0) 1228 goto err_map_inb; 1229 1230 map->dir = MAP_INBOUND; 1231 map->rio_addr = raddr; 1232 map->size = size; 1233 map->filp = filp; 1234 map->md = md; 1235 kref_init(&map->ref); 1236 mutex_lock(&md->buf_mutex); 1237 list_add_tail(&map->node, &md->mappings); 1238 mutex_unlock(&md->buf_mutex); 1239 *mapping = map; 1240 return 0; 1241 1242 err_map_inb: 1243 dma_free_coherent(mport->dev.parent, size, 1244 map->virt_addr, map->phys_addr); 1245 err_dma_alloc: 1246 kfree(map); 1247 return ret; 1248 } 1249 1250 static int 1251 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp, 1252 u64 raddr, u64 size, 1253 struct rio_mport_mapping **mapping) 1254 { 1255 struct rio_mport_mapping *map; 1256 int err = -ENOMEM; 1257 1258 if (raddr == RIO_MAP_ANY_ADDR) 1259 goto get_new; 1260 1261 mutex_lock(&md->buf_mutex); 1262 list_for_each_entry(map, &md->mappings, node) { 1263 if (map->dir != MAP_INBOUND) 1264 continue; 1265 if (raddr == map->rio_addr && size == map->size) { 1266 /* allow exact match only */ 1267 *mapping = map; 1268 err = 0; 1269 break; 1270 } else if (raddr < (map->rio_addr + map->size - 1) && 1271 (raddr + size) > map->rio_addr) { 1272 err = -EBUSY; 1273 break; 1274 } 1275 } 1276 mutex_unlock(&md->buf_mutex); 1277 1278 if (err != -ENOMEM) 1279 return err; 1280 get_new: 1281 /* not found, create new */ 1282 return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping); 1283 } 1284 1285 static int rio_mport_map_inbound(struct file *filp, void __user *arg) 1286 { 1287 struct mport_cdev_priv *priv = filp->private_data; 1288 struct mport_dev *md = priv->md; 1289 struct rio_mmap map; 1290 struct rio_mport_mapping *mapping = NULL; 1291 int ret; 1292 1293 if (!md->mport->ops->map_inb) 1294 return -EPROTONOSUPPORT; 1295 if (unlikely(copy_from_user(&map, arg, sizeof(map)))) 1296 return -EFAULT; 1297 1298 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp); 1299 1300 ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr, 1301 map.length, &mapping); 1302 if (ret) 1303 return ret; 1304 1305 map.handle = mapping->phys_addr; 1306 map.rio_addr = mapping->rio_addr; 1307 1308 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) { 1309 /* Delete mapping if it was created by this request */ 1310 if (ret == 0 && mapping->filp == filp) { 1311 mutex_lock(&md->buf_mutex); 1312 kref_put(&mapping->ref, mport_release_mapping); 1313 mutex_unlock(&md->buf_mutex); 1314 } 1315 return -EFAULT; 1316 } 1317 1318 return 0; 1319 } 1320 1321 /* 1322 * rio_mport_inbound_free() - unmap from RapidIO address space and free 1323 * previously allocated inbound DMA coherent buffer 1324 * @priv: driver private data 1325 * @arg: buffer handle returned by allocation routine 1326 */ 1327 static int rio_mport_inbound_free(struct file *filp, void __user *arg) 1328 { 1329 struct mport_cdev_priv *priv = filp->private_data; 1330 struct mport_dev *md = priv->md; 1331 u64 handle; 1332 struct rio_mport_mapping *map, *_map; 1333 1334 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp); 1335 1336 if (!md->mport->ops->unmap_inb) 1337 return -EPROTONOSUPPORT; 1338 1339 if (copy_from_user(&handle, arg, sizeof(handle))) 1340 return -EFAULT; 1341 1342 mutex_lock(&md->buf_mutex); 1343 list_for_each_entry_safe(map, _map, &md->mappings, node) { 1344 if (map->dir == MAP_INBOUND && map->phys_addr == handle) { 1345 if (map->filp == filp) { 1346 map->filp = NULL; 1347 kref_put(&map->ref, mport_release_mapping); 1348 } 1349 break; 1350 } 1351 } 1352 mutex_unlock(&md->buf_mutex); 1353 1354 return 0; 1355 } 1356 1357 /* 1358 * maint_port_idx_get() - Get the port index of the mport instance 1359 * @priv: driver private data 1360 * @arg: port index 1361 */ 1362 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg) 1363 { 1364 struct mport_dev *md = priv->md; 1365 u32 port_idx = md->mport->index; 1366 1367 rmcd_debug(MPORT, "port_index=%d", port_idx); 1368 1369 if (copy_to_user(arg, &port_idx, sizeof(port_idx))) 1370 return -EFAULT; 1371 1372 return 0; 1373 } 1374 1375 static int rio_mport_add_event(struct mport_cdev_priv *priv, 1376 struct rio_event *event) 1377 { 1378 int overflow; 1379 1380 if (!(priv->event_mask & event->header)) 1381 return -EACCES; 1382 1383 spin_lock(&priv->fifo_lock); 1384 overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event) 1385 || kfifo_in(&priv->event_fifo, (unsigned char *)event, 1386 sizeof(*event)) != sizeof(*event); 1387 spin_unlock(&priv->fifo_lock); 1388 1389 wake_up_interruptible(&priv->event_rx_wait); 1390 1391 if (overflow) { 1392 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n"); 1393 return -EBUSY; 1394 } 1395 1396 return 0; 1397 } 1398 1399 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id, 1400 u16 src, u16 dst, u16 info) 1401 { 1402 struct mport_dev *data = dev_id; 1403 struct mport_cdev_priv *priv; 1404 struct rio_mport_db_filter *db_filter; 1405 struct rio_event event; 1406 int handled; 1407 1408 event.header = RIO_DOORBELL; 1409 event.u.doorbell.rioid = src; 1410 event.u.doorbell.payload = info; 1411 1412 handled = 0; 1413 spin_lock(&data->db_lock); 1414 list_for_each_entry(db_filter, &data->doorbells, data_node) { 1415 if (((db_filter->filter.rioid == RIO_INVALID_DESTID || 1416 db_filter->filter.rioid == src)) && 1417 info >= db_filter->filter.low && 1418 info <= db_filter->filter.high) { 1419 priv = db_filter->priv; 1420 rio_mport_add_event(priv, &event); 1421 handled = 1; 1422 } 1423 } 1424 spin_unlock(&data->db_lock); 1425 1426 if (!handled) 1427 dev_warn(&data->dev, 1428 "%s: spurious DB received from 0x%x, info=0x%04x\n", 1429 __func__, src, info); 1430 } 1431 1432 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv, 1433 void __user *arg) 1434 { 1435 struct mport_dev *md = priv->md; 1436 struct rio_mport_db_filter *db_filter; 1437 struct rio_doorbell_filter filter; 1438 unsigned long flags; 1439 int ret; 1440 1441 if (copy_from_user(&filter, arg, sizeof(filter))) 1442 return -EFAULT; 1443 1444 if (filter.low > filter.high) 1445 return -EINVAL; 1446 1447 ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high, 1448 rio_mport_doorbell_handler); 1449 if (ret) { 1450 rmcd_error("%s failed to register IBDB, err=%d", 1451 dev_name(&md->dev), ret); 1452 return ret; 1453 } 1454 1455 db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL); 1456 if (db_filter == NULL) { 1457 rio_release_inb_dbell(md->mport, filter.low, filter.high); 1458 return -ENOMEM; 1459 } 1460 1461 db_filter->filter = filter; 1462 db_filter->priv = priv; 1463 spin_lock_irqsave(&md->db_lock, flags); 1464 list_add_tail(&db_filter->priv_node, &priv->db_filters); 1465 list_add_tail(&db_filter->data_node, &md->doorbells); 1466 spin_unlock_irqrestore(&md->db_lock, flags); 1467 1468 return 0; 1469 } 1470 1471 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter) 1472 { 1473 list_del(&db_filter->data_node); 1474 list_del(&db_filter->priv_node); 1475 kfree(db_filter); 1476 } 1477 1478 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv, 1479 void __user *arg) 1480 { 1481 struct rio_mport_db_filter *db_filter; 1482 struct rio_doorbell_filter filter; 1483 unsigned long flags; 1484 int ret = -EINVAL; 1485 1486 if (copy_from_user(&filter, arg, sizeof(filter))) 1487 return -EFAULT; 1488 1489 if (filter.low > filter.high) 1490 return -EINVAL; 1491 1492 spin_lock_irqsave(&priv->md->db_lock, flags); 1493 list_for_each_entry(db_filter, &priv->db_filters, priv_node) { 1494 if (db_filter->filter.rioid == filter.rioid && 1495 db_filter->filter.low == filter.low && 1496 db_filter->filter.high == filter.high) { 1497 rio_mport_delete_db_filter(db_filter); 1498 ret = 0; 1499 break; 1500 } 1501 } 1502 spin_unlock_irqrestore(&priv->md->db_lock, flags); 1503 1504 if (!ret) 1505 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high); 1506 1507 return ret; 1508 } 1509 1510 static int rio_mport_match_pw(union rio_pw_msg *msg, 1511 struct rio_pw_filter *filter) 1512 { 1513 if ((msg->em.comptag & filter->mask) < filter->low || 1514 (msg->em.comptag & filter->mask) > filter->high) 1515 return 0; 1516 return 1; 1517 } 1518 1519 static int rio_mport_pw_handler(struct rio_mport *mport, void *context, 1520 union rio_pw_msg *msg, int step) 1521 { 1522 struct mport_dev *md = context; 1523 struct mport_cdev_priv *priv; 1524 struct rio_mport_pw_filter *pw_filter; 1525 struct rio_event event; 1526 int handled; 1527 1528 event.header = RIO_PORTWRITE; 1529 memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE); 1530 1531 handled = 0; 1532 spin_lock(&md->pw_lock); 1533 list_for_each_entry(pw_filter, &md->portwrites, md_node) { 1534 if (rio_mport_match_pw(msg, &pw_filter->filter)) { 1535 priv = pw_filter->priv; 1536 rio_mport_add_event(priv, &event); 1537 handled = 1; 1538 } 1539 } 1540 spin_unlock(&md->pw_lock); 1541 1542 if (!handled) { 1543 printk_ratelimited(KERN_WARNING DRV_NAME 1544 ": mport%d received spurious PW from 0x%08x\n", 1545 mport->id, msg->em.comptag); 1546 } 1547 1548 return 0; 1549 } 1550 1551 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv, 1552 void __user *arg) 1553 { 1554 struct mport_dev *md = priv->md; 1555 struct rio_mport_pw_filter *pw_filter; 1556 struct rio_pw_filter filter; 1557 unsigned long flags; 1558 int hadd = 0; 1559 1560 if (copy_from_user(&filter, arg, sizeof(filter))) 1561 return -EFAULT; 1562 1563 pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL); 1564 if (pw_filter == NULL) 1565 return -ENOMEM; 1566 1567 pw_filter->filter = filter; 1568 pw_filter->priv = priv; 1569 spin_lock_irqsave(&md->pw_lock, flags); 1570 if (list_empty(&md->portwrites)) 1571 hadd = 1; 1572 list_add_tail(&pw_filter->priv_node, &priv->pw_filters); 1573 list_add_tail(&pw_filter->md_node, &md->portwrites); 1574 spin_unlock_irqrestore(&md->pw_lock, flags); 1575 1576 if (hadd) { 1577 int ret; 1578 1579 ret = rio_add_mport_pw_handler(md->mport, md, 1580 rio_mport_pw_handler); 1581 if (ret) { 1582 dev_err(&md->dev, 1583 "%s: failed to add IB_PW handler, err=%d\n", 1584 __func__, ret); 1585 return ret; 1586 } 1587 rio_pw_enable(md->mport, 1); 1588 } 1589 1590 return 0; 1591 } 1592 1593 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter) 1594 { 1595 list_del(&pw_filter->md_node); 1596 list_del(&pw_filter->priv_node); 1597 kfree(pw_filter); 1598 } 1599 1600 static int rio_mport_match_pw_filter(struct rio_pw_filter *a, 1601 struct rio_pw_filter *b) 1602 { 1603 if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high)) 1604 return 1; 1605 return 0; 1606 } 1607 1608 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv, 1609 void __user *arg) 1610 { 1611 struct mport_dev *md = priv->md; 1612 struct rio_mport_pw_filter *pw_filter; 1613 struct rio_pw_filter filter; 1614 unsigned long flags; 1615 int ret = -EINVAL; 1616 int hdel = 0; 1617 1618 if (copy_from_user(&filter, arg, sizeof(filter))) 1619 return -EFAULT; 1620 1621 spin_lock_irqsave(&md->pw_lock, flags); 1622 list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) { 1623 if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) { 1624 rio_mport_delete_pw_filter(pw_filter); 1625 ret = 0; 1626 break; 1627 } 1628 } 1629 1630 if (list_empty(&md->portwrites)) 1631 hdel = 1; 1632 spin_unlock_irqrestore(&md->pw_lock, flags); 1633 1634 if (hdel) { 1635 rio_del_mport_pw_handler(md->mport, priv->md, 1636 rio_mport_pw_handler); 1637 rio_pw_enable(md->mport, 0); 1638 } 1639 1640 return ret; 1641 } 1642 1643 /* 1644 * rio_release_dev - release routine for kernel RIO device object 1645 * @dev: kernel device object associated with a RIO device structure 1646 * 1647 * Frees a RIO device struct associated a RIO device struct. 1648 * The RIO device struct is freed. 1649 */ 1650 static void rio_release_dev(struct device *dev) 1651 { 1652 struct rio_dev *rdev; 1653 1654 rdev = to_rio_dev(dev); 1655 pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev)); 1656 kfree(rdev); 1657 } 1658 1659 1660 static void rio_release_net(struct device *dev) 1661 { 1662 struct rio_net *net; 1663 1664 net = to_rio_net(dev); 1665 rmcd_debug(RDEV, "net_%d", net->id); 1666 kfree(net); 1667 } 1668 1669 1670 /* 1671 * rio_mport_add_riodev - creates a kernel RIO device object 1672 * 1673 * Allocates a RIO device data structure and initializes required fields based 1674 * on device's configuration space contents. 1675 * If the device has switch capabilities, then a switch specific portion is 1676 * allocated and configured. 1677 */ 1678 static int rio_mport_add_riodev(struct mport_cdev_priv *priv, 1679 void __user *arg) 1680 { 1681 struct mport_dev *md = priv->md; 1682 struct rio_rdev_info dev_info; 1683 struct rio_dev *rdev; 1684 struct rio_switch *rswitch = NULL; 1685 struct rio_mport *mport; 1686 struct device *dev; 1687 size_t size; 1688 u32 rval; 1689 u32 swpinfo = 0; 1690 u16 destid; 1691 u8 hopcount; 1692 int err; 1693 1694 if (copy_from_user(&dev_info, arg, sizeof(dev_info))) 1695 return -EFAULT; 1696 dev_info.name[sizeof(dev_info.name) - 1] = '\0'; 1697 1698 rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name, 1699 dev_info.comptag, dev_info.destid, dev_info.hopcount); 1700 1701 dev = bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name); 1702 if (dev) { 1703 rmcd_debug(RDEV, "device %s already exists", dev_info.name); 1704 put_device(dev); 1705 return -EEXIST; 1706 } 1707 1708 size = sizeof(*rdev); 1709 mport = md->mport; 1710 destid = dev_info.destid; 1711 hopcount = dev_info.hopcount; 1712 1713 if (rio_mport_read_config_32(mport, destid, hopcount, 1714 RIO_PEF_CAR, &rval)) 1715 return -EIO; 1716 1717 if (rval & RIO_PEF_SWITCH) { 1718 rio_mport_read_config_32(mport, destid, hopcount, 1719 RIO_SWP_INFO_CAR, &swpinfo); 1720 size += struct_size(rswitch, nextdev, RIO_GET_TOTAL_PORTS(swpinfo)); 1721 } 1722 1723 rdev = kzalloc(size, GFP_KERNEL); 1724 if (rdev == NULL) 1725 return -ENOMEM; 1726 1727 if (mport->net == NULL) { 1728 struct rio_net *net; 1729 1730 net = rio_alloc_net(mport); 1731 if (!net) { 1732 err = -ENOMEM; 1733 rmcd_debug(RDEV, "failed to allocate net object"); 1734 goto cleanup; 1735 } 1736 1737 net->id = mport->id; 1738 net->hport = mport; 1739 dev_set_name(&net->dev, "rnet_%d", net->id); 1740 net->dev.parent = &mport->dev; 1741 net->dev.release = rio_release_net; 1742 err = rio_add_net(net); 1743 if (err) { 1744 rmcd_debug(RDEV, "failed to register net, err=%d", err); 1745 kfree(net); 1746 goto cleanup; 1747 } 1748 } 1749 1750 rdev->net = mport->net; 1751 rdev->pef = rval; 1752 rdev->swpinfo = swpinfo; 1753 rio_mport_read_config_32(mport, destid, hopcount, 1754 RIO_DEV_ID_CAR, &rval); 1755 rdev->did = rval >> 16; 1756 rdev->vid = rval & 0xffff; 1757 rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR, 1758 &rdev->device_rev); 1759 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR, 1760 &rval); 1761 rdev->asm_did = rval >> 16; 1762 rdev->asm_vid = rval & 0xffff; 1763 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR, 1764 &rval); 1765 rdev->asm_rev = rval >> 16; 1766 1767 if (rdev->pef & RIO_PEF_EXT_FEATURES) { 1768 rdev->efptr = rval & 0xffff; 1769 rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid, 1770 hopcount, &rdev->phys_rmap); 1771 1772 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid, 1773 hopcount, RIO_EFB_ERR_MGMNT); 1774 } 1775 1776 rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR, 1777 &rdev->src_ops); 1778 rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR, 1779 &rdev->dst_ops); 1780 1781 rdev->comp_tag = dev_info.comptag; 1782 rdev->destid = destid; 1783 /* hopcount is stored as specified by a caller, regardles of EP or SW */ 1784 rdev->hopcount = hopcount; 1785 1786 if (rdev->pef & RIO_PEF_SWITCH) { 1787 rswitch = rdev->rswitch; 1788 rswitch->route_table = NULL; 1789 } 1790 1791 if (strlen(dev_info.name)) 1792 dev_set_name(&rdev->dev, "%s", dev_info.name); 1793 else if (rdev->pef & RIO_PEF_SWITCH) 1794 dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id, 1795 rdev->comp_tag & RIO_CTAG_UDEVID); 1796 else 1797 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id, 1798 rdev->comp_tag & RIO_CTAG_UDEVID); 1799 1800 INIT_LIST_HEAD(&rdev->net_list); 1801 rdev->dev.parent = &mport->net->dev; 1802 rio_attach_device(rdev); 1803 rdev->dev.release = rio_release_dev; 1804 1805 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) 1806 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], 1807 0, 0xffff); 1808 err = rio_add_device(rdev); 1809 if (err) { 1810 put_device(&rdev->dev); 1811 return err; 1812 } 1813 1814 rio_dev_get(rdev); 1815 1816 return 0; 1817 cleanup: 1818 kfree(rdev); 1819 return err; 1820 } 1821 1822 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg) 1823 { 1824 struct rio_rdev_info dev_info; 1825 struct rio_dev *rdev = NULL; 1826 struct device *dev; 1827 struct rio_mport *mport; 1828 struct rio_net *net; 1829 1830 if (copy_from_user(&dev_info, arg, sizeof(dev_info))) 1831 return -EFAULT; 1832 dev_info.name[sizeof(dev_info.name) - 1] = '\0'; 1833 1834 mport = priv->md->mport; 1835 1836 /* If device name is specified, removal by name has priority */ 1837 if (strlen(dev_info.name)) { 1838 dev = bus_find_device_by_name(&rio_bus_type, NULL, 1839 dev_info.name); 1840 if (dev) 1841 rdev = to_rio_dev(dev); 1842 } else { 1843 do { 1844 rdev = rio_get_comptag(dev_info.comptag, rdev); 1845 if (rdev && rdev->dev.parent == &mport->net->dev && 1846 rdev->destid == dev_info.destid && 1847 rdev->hopcount == dev_info.hopcount) 1848 break; 1849 } while (rdev); 1850 } 1851 1852 if (!rdev) { 1853 rmcd_debug(RDEV, 1854 "device name:%s ct:0x%x did:0x%x hc:0x%x not found", 1855 dev_info.name, dev_info.comptag, dev_info.destid, 1856 dev_info.hopcount); 1857 return -ENODEV; 1858 } 1859 1860 net = rdev->net; 1861 rio_dev_put(rdev); 1862 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN); 1863 1864 if (list_empty(&net->devices)) { 1865 rio_free_net(net); 1866 mport->net = NULL; 1867 } 1868 1869 return 0; 1870 } 1871 1872 /* 1873 * Mport cdev management 1874 */ 1875 1876 /* 1877 * mport_cdev_open() - Open character device (mport) 1878 */ 1879 static int mport_cdev_open(struct inode *inode, struct file *filp) 1880 { 1881 int ret; 1882 int minor = iminor(inode); 1883 struct mport_dev *chdev; 1884 struct mport_cdev_priv *priv; 1885 1886 /* Test for valid device */ 1887 if (minor >= RIO_MAX_MPORTS) { 1888 rmcd_error("Invalid minor device number"); 1889 return -EINVAL; 1890 } 1891 1892 chdev = container_of(inode->i_cdev, struct mport_dev, cdev); 1893 1894 rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp); 1895 1896 if (atomic_read(&chdev->active) == 0) 1897 return -ENODEV; 1898 1899 get_device(&chdev->dev); 1900 1901 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1902 if (!priv) { 1903 put_device(&chdev->dev); 1904 return -ENOMEM; 1905 } 1906 1907 priv->md = chdev; 1908 1909 INIT_LIST_HEAD(&priv->db_filters); 1910 INIT_LIST_HEAD(&priv->pw_filters); 1911 spin_lock_init(&priv->fifo_lock); 1912 init_waitqueue_head(&priv->event_rx_wait); 1913 ret = kfifo_alloc(&priv->event_fifo, 1914 sizeof(struct rio_event) * MPORT_EVENT_DEPTH, 1915 GFP_KERNEL); 1916 if (ret < 0) { 1917 put_device(&chdev->dev); 1918 dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n"); 1919 ret = -ENOMEM; 1920 goto err_fifo; 1921 } 1922 1923 #ifdef CONFIG_RAPIDIO_DMA_ENGINE 1924 INIT_LIST_HEAD(&priv->async_list); 1925 spin_lock_init(&priv->req_lock); 1926 mutex_init(&priv->dma_lock); 1927 #endif 1928 mutex_lock(&chdev->file_mutex); 1929 list_add_tail(&priv->list, &chdev->file_list); 1930 mutex_unlock(&chdev->file_mutex); 1931 1932 filp->private_data = priv; 1933 goto out; 1934 err_fifo: 1935 kfree(priv); 1936 out: 1937 return ret; 1938 } 1939 1940 static int mport_cdev_fasync(int fd, struct file *filp, int mode) 1941 { 1942 struct mport_cdev_priv *priv = filp->private_data; 1943 1944 return fasync_helper(fd, filp, mode, &priv->async_queue); 1945 } 1946 1947 #ifdef CONFIG_RAPIDIO_DMA_ENGINE 1948 static void mport_cdev_release_dma(struct file *filp) 1949 { 1950 struct mport_cdev_priv *priv = filp->private_data; 1951 struct mport_dev *md; 1952 struct mport_dma_req *req, *req_next; 1953 unsigned long tmo = msecs_to_jiffies(dma_timeout); 1954 long wret; 1955 LIST_HEAD(list); 1956 1957 rmcd_debug(EXIT, "from filp=%p %s(%d)", 1958 filp, current->comm, task_pid_nr(current)); 1959 1960 if (!priv->dmach) { 1961 rmcd_debug(EXIT, "No DMA channel for filp=%p", filp); 1962 return; 1963 } 1964 1965 md = priv->md; 1966 1967 spin_lock(&priv->req_lock); 1968 if (!list_empty(&priv->async_list)) { 1969 rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)", 1970 filp, current->comm, task_pid_nr(current)); 1971 list_splice_init(&priv->async_list, &list); 1972 } 1973 spin_unlock(&priv->req_lock); 1974 1975 if (!list_empty(&list)) { 1976 rmcd_debug(EXIT, "temp list not empty"); 1977 list_for_each_entry_safe(req, req_next, &list, node) { 1978 rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s", 1979 req->filp, req->cookie, 1980 completion_done(&req->req_comp)?"yes":"no"); 1981 list_del(&req->node); 1982 kref_put(&req->refcount, dma_req_free); 1983 } 1984 } 1985 1986 put_dma_channel(priv); 1987 wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo); 1988 1989 if (wret <= 0) { 1990 rmcd_error("%s(%d) failed waiting for DMA release err=%ld", 1991 current->comm, task_pid_nr(current), wret); 1992 } 1993 1994 if (priv->dmach != priv->md->dma_chan) { 1995 rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)", 1996 filp, current->comm, task_pid_nr(current)); 1997 rio_release_dma(priv->dmach); 1998 } else { 1999 rmcd_debug(EXIT, "Adjust default DMA channel refcount"); 2000 kref_put(&md->dma_ref, mport_release_def_dma); 2001 } 2002 2003 priv->dmach = NULL; 2004 } 2005 #else 2006 #define mport_cdev_release_dma(priv) do {} while (0) 2007 #endif 2008 2009 /* 2010 * mport_cdev_release() - Release character device 2011 */ 2012 static int mport_cdev_release(struct inode *inode, struct file *filp) 2013 { 2014 struct mport_cdev_priv *priv = filp->private_data; 2015 struct mport_dev *chdev; 2016 struct rio_mport_pw_filter *pw_filter, *pw_filter_next; 2017 struct rio_mport_db_filter *db_filter, *db_filter_next; 2018 struct rio_mport_mapping *map, *_map; 2019 unsigned long flags; 2020 2021 rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp); 2022 2023 chdev = priv->md; 2024 mport_cdev_release_dma(filp); 2025 2026 priv->event_mask = 0; 2027 2028 spin_lock_irqsave(&chdev->pw_lock, flags); 2029 if (!list_empty(&priv->pw_filters)) { 2030 list_for_each_entry_safe(pw_filter, pw_filter_next, 2031 &priv->pw_filters, priv_node) 2032 rio_mport_delete_pw_filter(pw_filter); 2033 } 2034 spin_unlock_irqrestore(&chdev->pw_lock, flags); 2035 2036 spin_lock_irqsave(&chdev->db_lock, flags); 2037 list_for_each_entry_safe(db_filter, db_filter_next, 2038 &priv->db_filters, priv_node) { 2039 rio_mport_delete_db_filter(db_filter); 2040 } 2041 spin_unlock_irqrestore(&chdev->db_lock, flags); 2042 2043 kfifo_free(&priv->event_fifo); 2044 2045 mutex_lock(&chdev->buf_mutex); 2046 list_for_each_entry_safe(map, _map, &chdev->mappings, node) { 2047 if (map->filp == filp) { 2048 rmcd_debug(EXIT, "release mapping %p filp=%p", 2049 map->virt_addr, filp); 2050 kref_put(&map->ref, mport_release_mapping); 2051 } 2052 } 2053 mutex_unlock(&chdev->buf_mutex); 2054 2055 mport_cdev_fasync(-1, filp, 0); 2056 filp->private_data = NULL; 2057 mutex_lock(&chdev->file_mutex); 2058 list_del(&priv->list); 2059 mutex_unlock(&chdev->file_mutex); 2060 put_device(&chdev->dev); 2061 kfree(priv); 2062 return 0; 2063 } 2064 2065 /* 2066 * mport_cdev_ioctl() - IOCTLs for character device 2067 */ 2068 static long mport_cdev_ioctl(struct file *filp, 2069 unsigned int cmd, unsigned long arg) 2070 { 2071 int err = -EINVAL; 2072 struct mport_cdev_priv *data = filp->private_data; 2073 struct mport_dev *md = data->md; 2074 2075 if (atomic_read(&md->active) == 0) 2076 return -ENODEV; 2077 2078 switch (cmd) { 2079 case RIO_MPORT_MAINT_READ_LOCAL: 2080 return rio_mport_maint_rd(data, (void __user *)arg, 1); 2081 case RIO_MPORT_MAINT_WRITE_LOCAL: 2082 return rio_mport_maint_wr(data, (void __user *)arg, 1); 2083 case RIO_MPORT_MAINT_READ_REMOTE: 2084 return rio_mport_maint_rd(data, (void __user *)arg, 0); 2085 case RIO_MPORT_MAINT_WRITE_REMOTE: 2086 return rio_mport_maint_wr(data, (void __user *)arg, 0); 2087 case RIO_MPORT_MAINT_HDID_SET: 2088 return maint_hdid_set(data, (void __user *)arg); 2089 case RIO_MPORT_MAINT_COMPTAG_SET: 2090 return maint_comptag_set(data, (void __user *)arg); 2091 case RIO_MPORT_MAINT_PORT_IDX_GET: 2092 return maint_port_idx_get(data, (void __user *)arg); 2093 case RIO_MPORT_GET_PROPERTIES: 2094 md->properties.hdid = md->mport->host_deviceid; 2095 if (copy_to_user((void __user *)arg, &(md->properties), 2096 sizeof(md->properties))) 2097 return -EFAULT; 2098 return 0; 2099 case RIO_ENABLE_DOORBELL_RANGE: 2100 return rio_mport_add_db_filter(data, (void __user *)arg); 2101 case RIO_DISABLE_DOORBELL_RANGE: 2102 return rio_mport_remove_db_filter(data, (void __user *)arg); 2103 case RIO_ENABLE_PORTWRITE_RANGE: 2104 return rio_mport_add_pw_filter(data, (void __user *)arg); 2105 case RIO_DISABLE_PORTWRITE_RANGE: 2106 return rio_mport_remove_pw_filter(data, (void __user *)arg); 2107 case RIO_SET_EVENT_MASK: 2108 data->event_mask = (u32)arg; 2109 return 0; 2110 case RIO_GET_EVENT_MASK: 2111 if (copy_to_user((void __user *)arg, &data->event_mask, 2112 sizeof(u32))) 2113 return -EFAULT; 2114 return 0; 2115 case RIO_MAP_OUTBOUND: 2116 return rio_mport_obw_map(filp, (void __user *)arg); 2117 case RIO_MAP_INBOUND: 2118 return rio_mport_map_inbound(filp, (void __user *)arg); 2119 case RIO_UNMAP_OUTBOUND: 2120 return rio_mport_obw_free(filp, (void __user *)arg); 2121 case RIO_UNMAP_INBOUND: 2122 return rio_mport_inbound_free(filp, (void __user *)arg); 2123 case RIO_ALLOC_DMA: 2124 return rio_mport_alloc_dma(filp, (void __user *)arg); 2125 case RIO_FREE_DMA: 2126 return rio_mport_free_dma(filp, (void __user *)arg); 2127 case RIO_WAIT_FOR_ASYNC: 2128 return rio_mport_wait_for_async_dma(filp, (void __user *)arg); 2129 case RIO_TRANSFER: 2130 return rio_mport_transfer_ioctl(filp, (void __user *)arg); 2131 case RIO_DEV_ADD: 2132 return rio_mport_add_riodev(data, (void __user *)arg); 2133 case RIO_DEV_DEL: 2134 return rio_mport_del_riodev(data, (void __user *)arg); 2135 default: 2136 break; 2137 } 2138 2139 return err; 2140 } 2141 2142 /* 2143 * mport_release_mapping - free mapping resources and info structure 2144 * @ref: a pointer to the kref within struct rio_mport_mapping 2145 * 2146 * NOTE: Shall be called while holding buf_mutex. 2147 */ 2148 static void mport_release_mapping(struct kref *ref) 2149 { 2150 struct rio_mport_mapping *map = 2151 container_of(ref, struct rio_mport_mapping, ref); 2152 struct rio_mport *mport = map->md->mport; 2153 2154 rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s", 2155 map->dir, map->virt_addr, 2156 &map->phys_addr, mport->name); 2157 2158 list_del(&map->node); 2159 2160 switch (map->dir) { 2161 case MAP_INBOUND: 2162 rio_unmap_inb_region(mport, map->phys_addr); 2163 fallthrough; 2164 case MAP_DMA: 2165 dma_free_coherent(mport->dev.parent, map->size, 2166 map->virt_addr, map->phys_addr); 2167 break; 2168 case MAP_OUTBOUND: 2169 rio_unmap_outb_region(mport, map->rioid, map->rio_addr); 2170 break; 2171 } 2172 kfree(map); 2173 } 2174 2175 static void mport_mm_open(struct vm_area_struct *vma) 2176 { 2177 struct rio_mport_mapping *map = vma->vm_private_data; 2178 2179 rmcd_debug(MMAP, "%pad", &map->phys_addr); 2180 kref_get(&map->ref); 2181 } 2182 2183 static void mport_mm_close(struct vm_area_struct *vma) 2184 { 2185 struct rio_mport_mapping *map = vma->vm_private_data; 2186 2187 rmcd_debug(MMAP, "%pad", &map->phys_addr); 2188 mutex_lock(&map->md->buf_mutex); 2189 kref_put(&map->ref, mport_release_mapping); 2190 mutex_unlock(&map->md->buf_mutex); 2191 } 2192 2193 static const struct vm_operations_struct vm_ops = { 2194 .open = mport_mm_open, 2195 .close = mport_mm_close, 2196 }; 2197 2198 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma) 2199 { 2200 struct mport_cdev_priv *priv = filp->private_data; 2201 struct mport_dev *md; 2202 size_t size = vma->vm_end - vma->vm_start; 2203 dma_addr_t baddr; 2204 unsigned long offset; 2205 int found = 0, ret; 2206 struct rio_mport_mapping *map; 2207 2208 rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx", 2209 (unsigned int)size, vma->vm_pgoff); 2210 2211 md = priv->md; 2212 baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT); 2213 2214 mutex_lock(&md->buf_mutex); 2215 list_for_each_entry(map, &md->mappings, node) { 2216 if (baddr >= map->phys_addr && 2217 baddr < (map->phys_addr + map->size)) { 2218 found = 1; 2219 break; 2220 } 2221 } 2222 mutex_unlock(&md->buf_mutex); 2223 2224 if (!found) 2225 return -ENOMEM; 2226 2227 offset = baddr - map->phys_addr; 2228 2229 if (size + offset > map->size) 2230 return -EINVAL; 2231 2232 vma->vm_pgoff = offset >> PAGE_SHIFT; 2233 rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff); 2234 2235 if (map->dir == MAP_INBOUND || map->dir == MAP_DMA) 2236 ret = dma_mmap_coherent(md->mport->dev.parent, vma, 2237 map->virt_addr, map->phys_addr, map->size); 2238 else if (map->dir == MAP_OUTBOUND) { 2239 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 2240 ret = vm_iomap_memory(vma, map->phys_addr, map->size); 2241 } else { 2242 rmcd_error("Attempt to mmap unsupported mapping type"); 2243 ret = -EIO; 2244 } 2245 2246 if (!ret) { 2247 vma->vm_private_data = map; 2248 vma->vm_ops = &vm_ops; 2249 mport_mm_open(vma); 2250 } else { 2251 rmcd_error("MMAP exit with err=%d", ret); 2252 } 2253 2254 return ret; 2255 } 2256 2257 static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait) 2258 { 2259 struct mport_cdev_priv *priv = filp->private_data; 2260 2261 poll_wait(filp, &priv->event_rx_wait, wait); 2262 if (kfifo_len(&priv->event_fifo)) 2263 return EPOLLIN | EPOLLRDNORM; 2264 2265 return 0; 2266 } 2267 2268 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count, 2269 loff_t *ppos) 2270 { 2271 struct mport_cdev_priv *priv = filp->private_data; 2272 int copied; 2273 ssize_t ret; 2274 2275 if (!count) 2276 return 0; 2277 2278 if (kfifo_is_empty(&priv->event_fifo) && 2279 (filp->f_flags & O_NONBLOCK)) 2280 return -EAGAIN; 2281 2282 if (count % sizeof(struct rio_event)) 2283 return -EINVAL; 2284 2285 ret = wait_event_interruptible(priv->event_rx_wait, 2286 kfifo_len(&priv->event_fifo) != 0); 2287 if (ret) 2288 return ret; 2289 2290 while (ret < count) { 2291 if (kfifo_to_user(&priv->event_fifo, buf, 2292 sizeof(struct rio_event), &copied)) 2293 return -EFAULT; 2294 ret += copied; 2295 buf += copied; 2296 } 2297 2298 return ret; 2299 } 2300 2301 static ssize_t mport_write(struct file *filp, const char __user *buf, 2302 size_t count, loff_t *ppos) 2303 { 2304 struct mport_cdev_priv *priv = filp->private_data; 2305 struct rio_mport *mport = priv->md->mport; 2306 struct rio_event event; 2307 int len, ret; 2308 2309 if (!count) 2310 return 0; 2311 2312 if (count % sizeof(event)) 2313 return -EINVAL; 2314 2315 len = 0; 2316 while ((count - len) >= (int)sizeof(event)) { 2317 if (copy_from_user(&event, buf, sizeof(event))) 2318 return -EFAULT; 2319 2320 if (event.header != RIO_DOORBELL) 2321 return -EINVAL; 2322 2323 ret = rio_mport_send_doorbell(mport, 2324 event.u.doorbell.rioid, 2325 event.u.doorbell.payload); 2326 if (ret < 0) 2327 return ret; 2328 2329 len += sizeof(event); 2330 buf += sizeof(event); 2331 } 2332 2333 return len; 2334 } 2335 2336 static const struct file_operations mport_fops = { 2337 .owner = THIS_MODULE, 2338 .open = mport_cdev_open, 2339 .release = mport_cdev_release, 2340 .poll = mport_cdev_poll, 2341 .read = mport_read, 2342 .write = mport_write, 2343 .mmap = mport_cdev_mmap, 2344 .fasync = mport_cdev_fasync, 2345 .unlocked_ioctl = mport_cdev_ioctl 2346 }; 2347 2348 /* 2349 * Character device management 2350 */ 2351 2352 static void mport_device_release(struct device *dev) 2353 { 2354 struct mport_dev *md; 2355 2356 rmcd_debug(EXIT, "%s", dev_name(dev)); 2357 md = container_of(dev, struct mport_dev, dev); 2358 kfree(md); 2359 } 2360 2361 /* 2362 * mport_cdev_add() - Create mport_dev from rio_mport 2363 * @mport: RapidIO master port 2364 */ 2365 static struct mport_dev *mport_cdev_add(struct rio_mport *mport) 2366 { 2367 int ret = 0; 2368 struct mport_dev *md; 2369 struct rio_mport_attr attr; 2370 2371 md = kzalloc(sizeof(*md), GFP_KERNEL); 2372 if (!md) { 2373 rmcd_error("Unable allocate a device object"); 2374 return NULL; 2375 } 2376 2377 md->mport = mport; 2378 mutex_init(&md->buf_mutex); 2379 mutex_init(&md->file_mutex); 2380 INIT_LIST_HEAD(&md->file_list); 2381 2382 device_initialize(&md->dev); 2383 md->dev.devt = MKDEV(MAJOR(dev_number), mport->id); 2384 md->dev.class = &dev_class; 2385 md->dev.parent = &mport->dev; 2386 md->dev.release = mport_device_release; 2387 dev_set_name(&md->dev, DEV_NAME "%d", mport->id); 2388 atomic_set(&md->active, 1); 2389 2390 cdev_init(&md->cdev, &mport_fops); 2391 md->cdev.owner = THIS_MODULE; 2392 2393 INIT_LIST_HEAD(&md->doorbells); 2394 spin_lock_init(&md->db_lock); 2395 INIT_LIST_HEAD(&md->portwrites); 2396 spin_lock_init(&md->pw_lock); 2397 INIT_LIST_HEAD(&md->mappings); 2398 2399 md->properties.id = mport->id; 2400 md->properties.sys_size = mport->sys_size; 2401 md->properties.hdid = mport->host_deviceid; 2402 md->properties.index = mport->index; 2403 2404 /* The transfer_mode property will be returned through mport query 2405 * interface 2406 */ 2407 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */ 2408 md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED; 2409 #else 2410 md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER; 2411 #endif 2412 2413 ret = cdev_device_add(&md->cdev, &md->dev); 2414 if (ret) { 2415 rmcd_error("Failed to register mport %d (err=%d)", 2416 mport->id, ret); 2417 goto err_cdev; 2418 } 2419 ret = rio_query_mport(mport, &attr); 2420 if (!ret) { 2421 md->properties.flags = attr.flags; 2422 md->properties.link_speed = attr.link_speed; 2423 md->properties.link_width = attr.link_width; 2424 md->properties.dma_max_sge = attr.dma_max_sge; 2425 md->properties.dma_max_size = attr.dma_max_size; 2426 md->properties.dma_align = attr.dma_align; 2427 md->properties.cap_sys_size = 0; 2428 md->properties.cap_transfer_mode = 0; 2429 md->properties.cap_addr_size = 0; 2430 } else 2431 pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n", 2432 mport->name, MAJOR(dev_number), mport->id); 2433 2434 mutex_lock(&mport_devs_lock); 2435 list_add_tail(&md->node, &mport_devs); 2436 mutex_unlock(&mport_devs_lock); 2437 2438 pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n", 2439 mport->name, MAJOR(dev_number), mport->id); 2440 2441 return md; 2442 2443 err_cdev: 2444 put_device(&md->dev); 2445 return NULL; 2446 } 2447 2448 /* 2449 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release 2450 * associated DMA channels. 2451 */ 2452 static void mport_cdev_terminate_dma(struct mport_dev *md) 2453 { 2454 #ifdef CONFIG_RAPIDIO_DMA_ENGINE 2455 struct mport_cdev_priv *client; 2456 2457 rmcd_debug(DMA, "%s", dev_name(&md->dev)); 2458 2459 mutex_lock(&md->file_mutex); 2460 list_for_each_entry(client, &md->file_list, list) { 2461 if (client->dmach) { 2462 dmaengine_terminate_all(client->dmach); 2463 rio_release_dma(client->dmach); 2464 } 2465 } 2466 mutex_unlock(&md->file_mutex); 2467 2468 if (md->dma_chan) { 2469 dmaengine_terminate_all(md->dma_chan); 2470 rio_release_dma(md->dma_chan); 2471 md->dma_chan = NULL; 2472 } 2473 #endif 2474 } 2475 2476 2477 /* 2478 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open 2479 * mport_cdev files. 2480 */ 2481 static int mport_cdev_kill_fasync(struct mport_dev *md) 2482 { 2483 unsigned int files = 0; 2484 struct mport_cdev_priv *client; 2485 2486 mutex_lock(&md->file_mutex); 2487 list_for_each_entry(client, &md->file_list, list) { 2488 if (client->async_queue) 2489 kill_fasync(&client->async_queue, SIGIO, POLL_HUP); 2490 files++; 2491 } 2492 mutex_unlock(&md->file_mutex); 2493 return files; 2494 } 2495 2496 /* 2497 * mport_cdev_remove() - Remove mport character device 2498 * @dev: Mport device to remove 2499 */ 2500 static void mport_cdev_remove(struct mport_dev *md) 2501 { 2502 struct rio_mport_mapping *map, *_map; 2503 2504 rmcd_debug(EXIT, "Remove %s cdev", md->mport->name); 2505 atomic_set(&md->active, 0); 2506 mport_cdev_terminate_dma(md); 2507 rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler); 2508 cdev_device_del(&md->cdev, &md->dev); 2509 mport_cdev_kill_fasync(md); 2510 2511 /* TODO: do we need to give clients some time to close file 2512 * descriptors? Simple wait for XX, or kref? 2513 */ 2514 2515 /* 2516 * Release DMA buffers allocated for the mport device. 2517 * Disable associated inbound Rapidio requests mapping if applicable. 2518 */ 2519 mutex_lock(&md->buf_mutex); 2520 list_for_each_entry_safe(map, _map, &md->mappings, node) { 2521 kref_put(&map->ref, mport_release_mapping); 2522 } 2523 mutex_unlock(&md->buf_mutex); 2524 2525 if (!list_empty(&md->mappings)) 2526 rmcd_warn("WARNING: %s pending mappings on removal", 2527 md->mport->name); 2528 2529 rio_release_inb_dbell(md->mport, 0, 0x0fff); 2530 2531 put_device(&md->dev); 2532 } 2533 2534 /* 2535 * RIO rio_mport_interface driver 2536 */ 2537 2538 /* 2539 * mport_add_mport() - Add rio_mport from LDM device struct 2540 * @dev: Linux device model struct 2541 */ 2542 static int mport_add_mport(struct device *dev) 2543 { 2544 struct rio_mport *mport = NULL; 2545 struct mport_dev *chdev = NULL; 2546 2547 mport = to_rio_mport(dev); 2548 if (!mport) 2549 return -ENODEV; 2550 2551 chdev = mport_cdev_add(mport); 2552 if (!chdev) 2553 return -ENODEV; 2554 2555 return 0; 2556 } 2557 2558 /* 2559 * mport_remove_mport() - Remove rio_mport from global list 2560 * TODO remove device from global mport_dev list 2561 */ 2562 static void mport_remove_mport(struct device *dev) 2563 { 2564 struct rio_mport *mport = NULL; 2565 struct mport_dev *chdev; 2566 int found = 0; 2567 2568 mport = to_rio_mport(dev); 2569 rmcd_debug(EXIT, "Remove %s", mport->name); 2570 2571 mutex_lock(&mport_devs_lock); 2572 list_for_each_entry(chdev, &mport_devs, node) { 2573 if (chdev->mport->id == mport->id) { 2574 atomic_set(&chdev->active, 0); 2575 list_del(&chdev->node); 2576 found = 1; 2577 break; 2578 } 2579 } 2580 mutex_unlock(&mport_devs_lock); 2581 2582 if (found) 2583 mport_cdev_remove(chdev); 2584 } 2585 2586 /* the rio_mport_interface is used to handle local mport devices */ 2587 static struct class_interface rio_mport_interface __refdata = { 2588 .class = &rio_mport_class, 2589 .add_dev = mport_add_mport, 2590 .remove_dev = mport_remove_mport, 2591 }; 2592 2593 /* 2594 * Linux kernel module 2595 */ 2596 2597 /* 2598 * mport_init - Driver module loading 2599 */ 2600 static int __init mport_init(void) 2601 { 2602 int ret; 2603 2604 /* Create device class needed by udev */ 2605 ret = class_register(&dev_class); 2606 if (ret) { 2607 rmcd_error("Unable to create " DRV_NAME " class"); 2608 return ret; 2609 } 2610 2611 ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME); 2612 if (ret < 0) 2613 goto err_chr; 2614 2615 rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number)); 2616 2617 /* Register to rio_mport_interface */ 2618 ret = class_interface_register(&rio_mport_interface); 2619 if (ret) { 2620 rmcd_error("class_interface_register() failed, err=%d", ret); 2621 goto err_cli; 2622 } 2623 2624 return 0; 2625 2626 err_cli: 2627 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS); 2628 err_chr: 2629 class_unregister(&dev_class); 2630 return ret; 2631 } 2632 2633 /** 2634 * mport_exit - Driver module unloading 2635 */ 2636 static void __exit mport_exit(void) 2637 { 2638 class_interface_unregister(&rio_mport_interface); 2639 class_unregister(&dev_class); 2640 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS); 2641 } 2642 2643 module_init(mport_init); 2644 module_exit(mport_exit); 2645