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