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 > req->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 req->map->virt_addr + (baddr - req->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 size_t size; 969 970 if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction)))) 971 return -EFAULT; 972 973 if (transaction.count != 1) /* only single transfer for now */ 974 return -EINVAL; 975 976 if ((transaction.transfer_mode & 977 priv->md->properties.transfer_mode) == 0) 978 return -ENODEV; 979 980 size = array_size(sizeof(*transfer), transaction.count); 981 transfer = vmalloc(size); 982 if (!transfer) 983 return -ENOMEM; 984 985 if (unlikely(copy_from_user(transfer, 986 (void __user *)(uintptr_t)transaction.block, 987 size))) { 988 ret = -EFAULT; 989 goto out_free; 990 } 991 992 dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ? 993 DMA_FROM_DEVICE : DMA_TO_DEVICE; 994 for (i = 0; i < transaction.count && ret == 0; i++) 995 ret = rio_dma_transfer(filp, transaction.transfer_mode, 996 transaction.sync, dir, &transfer[i]); 997 998 if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block, 999 transfer, size))) 1000 ret = -EFAULT; 1001 1002out_free: 1003 vfree(transfer); 1004 1005 return ret; 1006} 1007 1008static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg) 1009{ 1010 struct mport_cdev_priv *priv; 1011 struct rio_async_tx_wait w_param; 1012 struct mport_dma_req *req; 1013 dma_cookie_t cookie; 1014 unsigned long tmo; 1015 long wret; 1016 int found = 0; 1017 int ret; 1018 1019 priv = (struct mport_cdev_priv *)filp->private_data; 1020 1021 if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param)))) 1022 return -EFAULT; 1023 1024 cookie = w_param.token; 1025 if (w_param.timeout) 1026 tmo = msecs_to_jiffies(w_param.timeout); 1027 else /* Use default DMA timeout */ 1028 tmo = msecs_to_jiffies(dma_timeout); 1029 1030 spin_lock(&priv->req_lock); 1031 list_for_each_entry(req, &priv->async_list, node) { 1032 if (req->cookie == cookie) { 1033 list_del(&req->node); 1034 found = 1; 1035 break; 1036 } 1037 } 1038 spin_unlock(&priv->req_lock); 1039 1040 if (!found) 1041 return -EAGAIN; 1042 1043 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo); 1044 1045 if (wret == 0) { 1046 /* Timeout on wait occurred */ 1047 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s", 1048 current->comm, task_pid_nr(current), 1049 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE"); 1050 ret = -ETIMEDOUT; 1051 goto err_tmo; 1052 } else if (wret == -ERESTARTSYS) { 1053 /* Wait_for_completion was interrupted by a signal but DMA may 1054 * be still in progress 1055 */ 1056 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted", 1057 current->comm, task_pid_nr(current), 1058 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE"); 1059 ret = -EINTR; 1060 goto err_tmo; 1061 } 1062 1063 if (req->status != DMA_COMPLETE) { 1064 /* DMA transaction completion signaled with transfer error */ 1065 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d", 1066 current->comm, task_pid_nr(current), 1067 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE", 1068 req->status); 1069 ret = -EIO; 1070 } else 1071 ret = 0; 1072 1073 if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED) 1074 kref_put(&req->refcount, dma_req_free); 1075 1076 return ret; 1077 1078err_tmo: 1079 /* Return request back into async queue */ 1080 spin_lock(&priv->req_lock); 1081 list_add_tail(&req->node, &priv->async_list); 1082 spin_unlock(&priv->req_lock); 1083 return ret; 1084} 1085 1086static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp, 1087 u64 size, struct rio_mport_mapping **mapping) 1088{ 1089 struct rio_mport_mapping *map; 1090 1091 map = kzalloc(sizeof(*map), GFP_KERNEL); 1092 if (map == NULL) 1093 return -ENOMEM; 1094 1095 map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size, 1096 &map->phys_addr, GFP_KERNEL); 1097 if (map->virt_addr == NULL) { 1098 kfree(map); 1099 return -ENOMEM; 1100 } 1101 1102 map->dir = MAP_DMA; 1103 map->size = size; 1104 map->filp = filp; 1105 map->md = md; 1106 kref_init(&map->ref); 1107 mutex_lock(&md->buf_mutex); 1108 list_add_tail(&map->node, &md->mappings); 1109 mutex_unlock(&md->buf_mutex); 1110 *mapping = map; 1111 1112 return 0; 1113} 1114 1115static int rio_mport_alloc_dma(struct file *filp, void __user *arg) 1116{ 1117 struct mport_cdev_priv *priv = filp->private_data; 1118 struct mport_dev *md = priv->md; 1119 struct rio_dma_mem map; 1120 struct rio_mport_mapping *mapping = NULL; 1121 int ret; 1122 1123 if (unlikely(copy_from_user(&map, arg, sizeof(map)))) 1124 return -EFAULT; 1125 1126 ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping); 1127 if (ret) 1128 return ret; 1129 1130 map.dma_handle = mapping->phys_addr; 1131 1132 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) { 1133 mutex_lock(&md->buf_mutex); 1134 kref_put(&mapping->ref, mport_release_mapping); 1135 mutex_unlock(&md->buf_mutex); 1136 return -EFAULT; 1137 } 1138 1139 return 0; 1140} 1141 1142static int rio_mport_free_dma(struct file *filp, void __user *arg) 1143{ 1144 struct mport_cdev_priv *priv = filp->private_data; 1145 struct mport_dev *md = priv->md; 1146 u64 handle; 1147 int ret = -EFAULT; 1148 struct rio_mport_mapping *map, *_map; 1149 1150 if (copy_from_user(&handle, arg, sizeof(handle))) 1151 return -EFAULT; 1152 rmcd_debug(EXIT, "filp=%p", filp); 1153 1154 mutex_lock(&md->buf_mutex); 1155 list_for_each_entry_safe(map, _map, &md->mappings, node) { 1156 if (map->dir == MAP_DMA && map->phys_addr == handle && 1157 map->filp == filp) { 1158 kref_put(&map->ref, mport_release_mapping); 1159 ret = 0; 1160 break; 1161 } 1162 } 1163 mutex_unlock(&md->buf_mutex); 1164 1165 if (ret == -EFAULT) { 1166 rmcd_debug(DMA, "ERR no matching mapping"); 1167 return ret; 1168 } 1169 1170 return 0; 1171} 1172#else 1173static int rio_mport_transfer_ioctl(struct file *filp, void *arg) 1174{ 1175 return -ENODEV; 1176} 1177 1178static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg) 1179{ 1180 return -ENODEV; 1181} 1182 1183static int rio_mport_alloc_dma(struct file *filp, void __user *arg) 1184{ 1185 return -ENODEV; 1186} 1187 1188static int rio_mport_free_dma(struct file *filp, void __user *arg) 1189{ 1190 return -ENODEV; 1191} 1192#endif /* CONFIG_RAPIDIO_DMA_ENGINE */ 1193 1194/* 1195 * Inbound/outbound memory mapping functions 1196 */ 1197 1198static int 1199rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp, 1200 u64 raddr, u64 size, 1201 struct rio_mport_mapping **mapping) 1202{ 1203 struct rio_mport *mport = md->mport; 1204 struct rio_mport_mapping *map; 1205 int ret; 1206 1207 /* rio_map_inb_region() accepts u32 size */ 1208 if (size > 0xffffffff) 1209 return -EINVAL; 1210 1211 map = kzalloc(sizeof(*map), GFP_KERNEL); 1212 if (map == NULL) 1213 return -ENOMEM; 1214 1215 map->virt_addr = dma_alloc_coherent(mport->dev.parent, size, 1216 &map->phys_addr, GFP_KERNEL); 1217 if (map->virt_addr == NULL) { 1218 ret = -ENOMEM; 1219 goto err_dma_alloc; 1220 } 1221 1222 if (raddr == RIO_MAP_ANY_ADDR) 1223 raddr = map->phys_addr; 1224 ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0); 1225 if (ret < 0) 1226 goto err_map_inb; 1227 1228 map->dir = MAP_INBOUND; 1229 map->rio_addr = raddr; 1230 map->size = size; 1231 map->filp = filp; 1232 map->md = md; 1233 kref_init(&map->ref); 1234 mutex_lock(&md->buf_mutex); 1235 list_add_tail(&map->node, &md->mappings); 1236 mutex_unlock(&md->buf_mutex); 1237 *mapping = map; 1238 return 0; 1239 1240err_map_inb: 1241 dma_free_coherent(mport->dev.parent, size, 1242 map->virt_addr, map->phys_addr); 1243err_dma_alloc: 1244 kfree(map); 1245 return ret; 1246} 1247 1248static int 1249rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp, 1250 u64 raddr, u64 size, 1251 struct rio_mport_mapping **mapping) 1252{ 1253 struct rio_mport_mapping *map; 1254 int err = -ENOMEM; 1255 1256 if (raddr == RIO_MAP_ANY_ADDR) 1257 goto get_new; 1258 1259 mutex_lock(&md->buf_mutex); 1260 list_for_each_entry(map, &md->mappings, node) { 1261 if (map->dir != MAP_INBOUND) 1262 continue; 1263 if (raddr == map->rio_addr && size == map->size) { 1264 /* allow exact match only */ 1265 *mapping = map; 1266 err = 0; 1267 break; 1268 } else if (raddr < (map->rio_addr + map->size - 1) && 1269 (raddr + size) > map->rio_addr) { 1270 err = -EBUSY; 1271 break; 1272 } 1273 } 1274 mutex_unlock(&md->buf_mutex); 1275 1276 if (err != -ENOMEM) 1277 return err; 1278get_new: 1279 /* not found, create new */ 1280 return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping); 1281} 1282 1283static int rio_mport_map_inbound(struct file *filp, void __user *arg) 1284{ 1285 struct mport_cdev_priv *priv = filp->private_data; 1286 struct mport_dev *md = priv->md; 1287 struct rio_mmap map; 1288 struct rio_mport_mapping *mapping = NULL; 1289 int ret; 1290 1291 if (!md->mport->ops->map_inb) 1292 return -EPROTONOSUPPORT; 1293 if (unlikely(copy_from_user(&map, arg, sizeof(map)))) 1294 return -EFAULT; 1295 1296 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp); 1297 1298 ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr, 1299 map.length, &mapping); 1300 if (ret) 1301 return ret; 1302 1303 map.handle = mapping->phys_addr; 1304 map.rio_addr = mapping->rio_addr; 1305 1306 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) { 1307 /* Delete mapping if it was created by this request */ 1308 if (ret == 0 && mapping->filp == filp) { 1309 mutex_lock(&md->buf_mutex); 1310 kref_put(&mapping->ref, mport_release_mapping); 1311 mutex_unlock(&md->buf_mutex); 1312 } 1313 return -EFAULT; 1314 } 1315 1316 return 0; 1317} 1318 1319/* 1320 * rio_mport_inbound_free() - unmap from RapidIO address space and free 1321 * previously allocated inbound DMA coherent buffer 1322 * @priv: driver private data 1323 * @arg: buffer handle returned by allocation routine 1324 */ 1325static int rio_mport_inbound_free(struct file *filp, void __user *arg) 1326{ 1327 struct mport_cdev_priv *priv = filp->private_data; 1328 struct mport_dev *md = priv->md; 1329 u64 handle; 1330 struct rio_mport_mapping *map, *_map; 1331 1332 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp); 1333 1334 if (!md->mport->ops->unmap_inb) 1335 return -EPROTONOSUPPORT; 1336 1337 if (copy_from_user(&handle, arg, sizeof(handle))) 1338 return -EFAULT; 1339 1340 mutex_lock(&md->buf_mutex); 1341 list_for_each_entry_safe(map, _map, &md->mappings, node) { 1342 if (map->dir == MAP_INBOUND && map->phys_addr == handle) { 1343 if (map->filp == filp) { 1344 map->filp = NULL; 1345 kref_put(&map->ref, mport_release_mapping); 1346 } 1347 break; 1348 } 1349 } 1350 mutex_unlock(&md->buf_mutex); 1351 1352 return 0; 1353} 1354 1355/* 1356 * maint_port_idx_get() - Get the port index of the mport instance 1357 * @priv: driver private data 1358 * @arg: port index 1359 */ 1360static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg) 1361{ 1362 struct mport_dev *md = priv->md; 1363 u32 port_idx = md->mport->index; 1364 1365 rmcd_debug(MPORT, "port_index=%d", port_idx); 1366 1367 if (copy_to_user(arg, &port_idx, sizeof(port_idx))) 1368 return -EFAULT; 1369 1370 return 0; 1371} 1372 1373static int rio_mport_add_event(struct mport_cdev_priv *priv, 1374 struct rio_event *event) 1375{ 1376 int overflow; 1377 1378 if (!(priv->event_mask & event->header)) 1379 return -EACCES; 1380 1381 spin_lock(&priv->fifo_lock); 1382 overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event) 1383 || kfifo_in(&priv->event_fifo, (unsigned char *)event, 1384 sizeof(*event)) != sizeof(*event); 1385 spin_unlock(&priv->fifo_lock); 1386 1387 wake_up_interruptible(&priv->event_rx_wait); 1388 1389 if (overflow) { 1390 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n"); 1391 return -EBUSY; 1392 } 1393 1394 return 0; 1395} 1396 1397static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id, 1398 u16 src, u16 dst, u16 info) 1399{ 1400 struct mport_dev *data = dev_id; 1401 struct mport_cdev_priv *priv; 1402 struct rio_mport_db_filter *db_filter; 1403 struct rio_event event; 1404 int handled; 1405 1406 event.header = RIO_DOORBELL; 1407 event.u.doorbell.rioid = src; 1408 event.u.doorbell.payload = info; 1409 1410 handled = 0; 1411 spin_lock(&data->db_lock); 1412 list_for_each_entry(db_filter, &data->doorbells, data_node) { 1413 if (((db_filter->filter.rioid == RIO_INVALID_DESTID || 1414 db_filter->filter.rioid == src)) && 1415 info >= db_filter->filter.low && 1416 info <= db_filter->filter.high) { 1417 priv = db_filter->priv; 1418 rio_mport_add_event(priv, &event); 1419 handled = 1; 1420 } 1421 } 1422 spin_unlock(&data->db_lock); 1423 1424 if (!handled) 1425 dev_warn(&data->dev, 1426 "%s: spurious DB received from 0x%x, info=0x%04x\n", 1427 __func__, src, info); 1428} 1429 1430static int rio_mport_add_db_filter(struct mport_cdev_priv *priv, 1431 void __user *arg) 1432{ 1433 struct mport_dev *md = priv->md; 1434 struct rio_mport_db_filter *db_filter; 1435 struct rio_doorbell_filter filter; 1436 unsigned long flags; 1437 int ret; 1438 1439 if (copy_from_user(&filter, arg, sizeof(filter))) 1440 return -EFAULT; 1441 1442 if (filter.low > filter.high) 1443 return -EINVAL; 1444 1445 ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high, 1446 rio_mport_doorbell_handler); 1447 if (ret) { 1448 rmcd_error("%s failed to register IBDB, err=%d", 1449 dev_name(&md->dev), ret); 1450 return ret; 1451 } 1452 1453 db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL); 1454 if (db_filter == NULL) { 1455 rio_release_inb_dbell(md->mport, filter.low, filter.high); 1456 return -ENOMEM; 1457 } 1458 1459 db_filter->filter = filter; 1460 db_filter->priv = priv; 1461 spin_lock_irqsave(&md->db_lock, flags); 1462 list_add_tail(&db_filter->priv_node, &priv->db_filters); 1463 list_add_tail(&db_filter->data_node, &md->doorbells); 1464 spin_unlock_irqrestore(&md->db_lock, flags); 1465 1466 return 0; 1467} 1468 1469static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter) 1470{ 1471 list_del(&db_filter->data_node); 1472 list_del(&db_filter->priv_node); 1473 kfree(db_filter); 1474} 1475 1476static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv, 1477 void __user *arg) 1478{ 1479 struct rio_mport_db_filter *db_filter; 1480 struct rio_doorbell_filter filter; 1481 unsigned long flags; 1482 int ret = -EINVAL; 1483 1484 if (copy_from_user(&filter, arg, sizeof(filter))) 1485 return -EFAULT; 1486 1487 if (filter.low > filter.high) 1488 return -EINVAL; 1489 1490 spin_lock_irqsave(&priv->md->db_lock, flags); 1491 list_for_each_entry(db_filter, &priv->db_filters, priv_node) { 1492 if (db_filter->filter.rioid == filter.rioid && 1493 db_filter->filter.low == filter.low && 1494 db_filter->filter.high == filter.high) { 1495 rio_mport_delete_db_filter(db_filter); 1496 ret = 0; 1497 break; 1498 } 1499 } 1500 spin_unlock_irqrestore(&priv->md->db_lock, flags); 1501 1502 if (!ret) 1503 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high); 1504 1505 return ret; 1506} 1507 1508static int rio_mport_match_pw(union rio_pw_msg *msg, 1509 struct rio_pw_filter *filter) 1510{ 1511 if ((msg->em.comptag & filter->mask) < filter->low || 1512 (msg->em.comptag & filter->mask) > filter->high) 1513 return 0; 1514 return 1; 1515} 1516 1517static int rio_mport_pw_handler(struct rio_mport *mport, void *context, 1518 union rio_pw_msg *msg, int step) 1519{ 1520 struct mport_dev *md = context; 1521 struct mport_cdev_priv *priv; 1522 struct rio_mport_pw_filter *pw_filter; 1523 struct rio_event event; 1524 int handled; 1525 1526 event.header = RIO_PORTWRITE; 1527 memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE); 1528 1529 handled = 0; 1530 spin_lock(&md->pw_lock); 1531 list_for_each_entry(pw_filter, &md->portwrites, md_node) { 1532 if (rio_mport_match_pw(msg, &pw_filter->filter)) { 1533 priv = pw_filter->priv; 1534 rio_mport_add_event(priv, &event); 1535 handled = 1; 1536 } 1537 } 1538 spin_unlock(&md->pw_lock); 1539 1540 if (!handled) { 1541 printk_ratelimited(KERN_WARNING DRV_NAME 1542 ": mport%d received spurious PW from 0x%08x\n", 1543 mport->id, msg->em.comptag); 1544 } 1545 1546 return 0; 1547} 1548 1549static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv, 1550 void __user *arg) 1551{ 1552 struct mport_dev *md = priv->md; 1553 struct rio_mport_pw_filter *pw_filter; 1554 struct rio_pw_filter filter; 1555 unsigned long flags; 1556 int hadd = 0; 1557 1558 if (copy_from_user(&filter, arg, sizeof(filter))) 1559 return -EFAULT; 1560 1561 pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL); 1562 if (pw_filter == NULL) 1563 return -ENOMEM; 1564 1565 pw_filter->filter = filter; 1566 pw_filter->priv = priv; 1567 spin_lock_irqsave(&md->pw_lock, flags); 1568 if (list_empty(&md->portwrites)) 1569 hadd = 1; 1570 list_add_tail(&pw_filter->priv_node, &priv->pw_filters); 1571 list_add_tail(&pw_filter->md_node, &md->portwrites); 1572 spin_unlock_irqrestore(&md->pw_lock, flags); 1573 1574 if (hadd) { 1575 int ret; 1576 1577 ret = rio_add_mport_pw_handler(md->mport, md, 1578 rio_mport_pw_handler); 1579 if (ret) { 1580 dev_err(&md->dev, 1581 "%s: failed to add IB_PW handler, err=%d\n", 1582 __func__, ret); 1583 return ret; 1584 } 1585 rio_pw_enable(md->mport, 1); 1586 } 1587 1588 return 0; 1589} 1590 1591static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter) 1592{ 1593 list_del(&pw_filter->md_node); 1594 list_del(&pw_filter->priv_node); 1595 kfree(pw_filter); 1596} 1597 1598static int rio_mport_match_pw_filter(struct rio_pw_filter *a, 1599 struct rio_pw_filter *b) 1600{ 1601 if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high)) 1602 return 1; 1603 return 0; 1604} 1605 1606static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv, 1607 void __user *arg) 1608{ 1609 struct mport_dev *md = priv->md; 1610 struct rio_mport_pw_filter *pw_filter; 1611 struct rio_pw_filter filter; 1612 unsigned long flags; 1613 int ret = -EINVAL; 1614 int hdel = 0; 1615 1616 if (copy_from_user(&filter, arg, sizeof(filter))) 1617 return -EFAULT; 1618 1619 spin_lock_irqsave(&md->pw_lock, flags); 1620 list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) { 1621 if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) { 1622 rio_mport_delete_pw_filter(pw_filter); 1623 ret = 0; 1624 break; 1625 } 1626 } 1627 1628 if (list_empty(&md->portwrites)) 1629 hdel = 1; 1630 spin_unlock_irqrestore(&md->pw_lock, flags); 1631 1632 if (hdel) { 1633 rio_del_mport_pw_handler(md->mport, priv->md, 1634 rio_mport_pw_handler); 1635 rio_pw_enable(md->mport, 0); 1636 } 1637 1638 return ret; 1639} 1640 1641/* 1642 * rio_release_dev - release routine for kernel RIO device object 1643 * @dev: kernel device object associated with a RIO device structure 1644 * 1645 * Frees a RIO device struct associated a RIO device struct. 1646 * The RIO device struct is freed. 1647 */ 1648static void rio_release_dev(struct device *dev) 1649{ 1650 struct rio_dev *rdev; 1651 1652 rdev = to_rio_dev(dev); 1653 pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev)); 1654 kfree(rdev); 1655} 1656 1657 1658static void rio_release_net(struct device *dev) 1659{ 1660 struct rio_net *net; 1661 1662 net = to_rio_net(dev); 1663 rmcd_debug(RDEV, "net_%d", net->id); 1664 kfree(net); 1665} 1666 1667 1668/* 1669 * rio_mport_add_riodev - creates a kernel RIO device object 1670 * 1671 * Allocates a RIO device data structure and initializes required fields based 1672 * on device's configuration space contents. 1673 * If the device has switch capabilities, then a switch specific portion is 1674 * allocated and configured. 1675 */ 1676static int rio_mport_add_riodev(struct mport_cdev_priv *priv, 1677 void __user *arg) 1678{ 1679 struct mport_dev *md = priv->md; 1680 struct rio_rdev_info dev_info; 1681 struct rio_dev *rdev; 1682 struct rio_switch *rswitch = NULL; 1683 struct rio_mport *mport; 1684 struct device *dev; 1685 size_t size; 1686 u32 rval; 1687 u32 swpinfo = 0; 1688 u16 destid; 1689 u8 hopcount; 1690 int err; 1691 1692 if (copy_from_user(&dev_info, arg, sizeof(dev_info))) 1693 return -EFAULT; 1694 dev_info.name[sizeof(dev_info.name) - 1] = '\0'; 1695 1696 rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name, 1697 dev_info.comptag, dev_info.destid, dev_info.hopcount); 1698 1699 dev = bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name); 1700 if (dev) { 1701 rmcd_debug(RDEV, "device %s already exists", dev_info.name); 1702 put_device(dev); 1703 return -EEXIST; 1704 } 1705 1706 size = sizeof(*rdev); 1707 mport = md->mport; 1708 destid = dev_info.destid; 1709 hopcount = dev_info.hopcount; 1710 1711 if (rio_mport_read_config_32(mport, destid, hopcount, 1712 RIO_PEF_CAR, &rval)) 1713 return -EIO; 1714 1715 if (rval & RIO_PEF_SWITCH) { 1716 rio_mport_read_config_32(mport, destid, hopcount, 1717 RIO_SWP_INFO_CAR, &swpinfo); 1718 size += struct_size(rswitch, nextdev, RIO_GET_TOTAL_PORTS(swpinfo)); 1719 } 1720 1721 rdev = kzalloc(size, GFP_KERNEL); 1722 if (rdev == NULL) 1723 return -ENOMEM; 1724 1725 if (mport->net == NULL) { 1726 struct rio_net *net; 1727 1728 net = rio_alloc_net(mport); 1729 if (!net) { 1730 err = -ENOMEM; 1731 rmcd_debug(RDEV, "failed to allocate net object"); 1732 goto cleanup; 1733 } 1734 1735 net->id = mport->id; 1736 net->hport = mport; 1737 dev_set_name(&net->dev, "rnet_%d", net->id); 1738 net->dev.parent = &mport->dev; 1739 net->dev.release = rio_release_net; 1740 err = rio_add_net(net); 1741 if (err) { 1742 rmcd_debug(RDEV, "failed to register net, err=%d", err); 1743 kfree(net); 1744 goto cleanup; 1745 } 1746 } 1747 1748 rdev->net = mport->net; 1749 rdev->pef = rval; 1750 rdev->swpinfo = swpinfo; 1751 rio_mport_read_config_32(mport, destid, hopcount, 1752 RIO_DEV_ID_CAR, &rval); 1753 rdev->did = rval >> 16; 1754 rdev->vid = rval & 0xffff; 1755 rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR, 1756 &rdev->device_rev); 1757 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR, 1758 &rval); 1759 rdev->asm_did = rval >> 16; 1760 rdev->asm_vid = rval & 0xffff; 1761 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR, 1762 &rval); 1763 rdev->asm_rev = rval >> 16; 1764 1765 if (rdev->pef & RIO_PEF_EXT_FEATURES) { 1766 rdev->efptr = rval & 0xffff; 1767 rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid, 1768 hopcount, &rdev->phys_rmap); 1769 1770 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid, 1771 hopcount, RIO_EFB_ERR_MGMNT); 1772 } 1773 1774 rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR, 1775 &rdev->src_ops); 1776 rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR, 1777 &rdev->dst_ops); 1778 1779 rdev->comp_tag = dev_info.comptag; 1780 rdev->destid = destid; 1781 /* hopcount is stored as specified by a caller, regardles of EP or SW */ 1782 rdev->hopcount = hopcount; 1783 1784 if (rdev->pef & RIO_PEF_SWITCH) { 1785 rswitch = rdev->rswitch; 1786 rswitch->route_table = NULL; 1787 } 1788 1789 if (strlen(dev_info.name)) 1790 dev_set_name(&rdev->dev, "%s", dev_info.name); 1791 else if (rdev->pef & RIO_PEF_SWITCH) 1792 dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id, 1793 rdev->comp_tag & RIO_CTAG_UDEVID); 1794 else 1795 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id, 1796 rdev->comp_tag & RIO_CTAG_UDEVID); 1797 1798 INIT_LIST_HEAD(&rdev->net_list); 1799 rdev->dev.parent = &mport->net->dev; 1800 rio_attach_device(rdev); 1801 rdev->dev.release = rio_release_dev; 1802 1803 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) 1804 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], 1805 0, 0xffff); 1806 err = rio_add_device(rdev); 1807 if (err) { 1808 put_device(&rdev->dev); 1809 return err; 1810 } 1811 1812 rio_dev_get(rdev); 1813 1814 return 0; 1815cleanup: 1816 kfree(rdev); 1817 return err; 1818} 1819 1820static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg) 1821{ 1822 struct rio_rdev_info dev_info; 1823 struct rio_dev *rdev = NULL; 1824 struct device *dev; 1825 struct rio_mport *mport; 1826 struct rio_net *net; 1827 1828 if (copy_from_user(&dev_info, arg, sizeof(dev_info))) 1829 return -EFAULT; 1830 dev_info.name[sizeof(dev_info.name) - 1] = '\0'; 1831 1832 mport = priv->md->mport; 1833 1834 /* If device name is specified, removal by name has priority */ 1835 if (strlen(dev_info.name)) { 1836 dev = bus_find_device_by_name(&rio_bus_type, NULL, 1837 dev_info.name); 1838 if (dev) 1839 rdev = to_rio_dev(dev); 1840 } else { 1841 do { 1842 rdev = rio_get_comptag(dev_info.comptag, rdev); 1843 if (rdev && rdev->dev.parent == &mport->net->dev && 1844 rdev->destid == dev_info.destid && 1845 rdev->hopcount == dev_info.hopcount) 1846 break; 1847 } while (rdev); 1848 } 1849 1850 if (!rdev) { 1851 rmcd_debug(RDEV, 1852 "device name:%s ct:0x%x did:0x%x hc:0x%x not found", 1853 dev_info.name, dev_info.comptag, dev_info.destid, 1854 dev_info.hopcount); 1855 return -ENODEV; 1856 } 1857 1858 net = rdev->net; 1859 rio_dev_put(rdev); 1860 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN); 1861 1862 if (list_empty(&net->devices)) { 1863 rio_free_net(net); 1864 mport->net = NULL; 1865 } 1866 1867 return 0; 1868} 1869 1870/* 1871 * Mport cdev management 1872 */ 1873 1874/* 1875 * mport_cdev_open() - Open character device (mport) 1876 */ 1877static int mport_cdev_open(struct inode *inode, struct file *filp) 1878{ 1879 int ret; 1880 int minor = iminor(inode); 1881 struct mport_dev *chdev; 1882 struct mport_cdev_priv *priv; 1883 1884 /* Test for valid device */ 1885 if (minor >= RIO_MAX_MPORTS) { 1886 rmcd_error("Invalid minor device number"); 1887 return -EINVAL; 1888 } 1889 1890 chdev = container_of(inode->i_cdev, struct mport_dev, cdev); 1891 1892 rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp); 1893 1894 if (atomic_read(&chdev->active) == 0) 1895 return -ENODEV; 1896 1897 get_device(&chdev->dev); 1898 1899 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1900 if (!priv) { 1901 put_device(&chdev->dev); 1902 return -ENOMEM; 1903 } 1904 1905 priv->md = chdev; 1906 1907 INIT_LIST_HEAD(&priv->db_filters); 1908 INIT_LIST_HEAD(&priv->pw_filters); 1909 spin_lock_init(&priv->fifo_lock); 1910 init_waitqueue_head(&priv->event_rx_wait); 1911 ret = kfifo_alloc(&priv->event_fifo, 1912 sizeof(struct rio_event) * MPORT_EVENT_DEPTH, 1913 GFP_KERNEL); 1914 if (ret < 0) { 1915 put_device(&chdev->dev); 1916 dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n"); 1917 ret = -ENOMEM; 1918 goto err_fifo; 1919 } 1920 1921#ifdef CONFIG_RAPIDIO_DMA_ENGINE 1922 INIT_LIST_HEAD(&priv->async_list); 1923 spin_lock_init(&priv->req_lock); 1924 mutex_init(&priv->dma_lock); 1925#endif 1926 mutex_lock(&chdev->file_mutex); 1927 list_add_tail(&priv->list, &chdev->file_list); 1928 mutex_unlock(&chdev->file_mutex); 1929 1930 filp->private_data = priv; 1931 goto out; 1932err_fifo: 1933 kfree(priv); 1934out: 1935 return ret; 1936} 1937 1938static int mport_cdev_fasync(int fd, struct file *filp, int mode) 1939{ 1940 struct mport_cdev_priv *priv = filp->private_data; 1941 1942 return fasync_helper(fd, filp, mode, &priv->async_queue); 1943} 1944 1945#ifdef CONFIG_RAPIDIO_DMA_ENGINE 1946static void mport_cdev_release_dma(struct file *filp) 1947{ 1948 struct mport_cdev_priv *priv = filp->private_data; 1949 struct mport_dev *md; 1950 struct mport_dma_req *req, *req_next; 1951 unsigned long tmo = msecs_to_jiffies(dma_timeout); 1952 long wret; 1953 LIST_HEAD(list); 1954 1955 rmcd_debug(EXIT, "from filp=%p %s(%d)", 1956 filp, current->comm, task_pid_nr(current)); 1957 1958 if (!priv->dmach) { 1959 rmcd_debug(EXIT, "No DMA channel for filp=%p", filp); 1960 return; 1961 } 1962 1963 md = priv->md; 1964 1965 spin_lock(&priv->req_lock); 1966 if (!list_empty(&priv->async_list)) { 1967 rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)", 1968 filp, current->comm, task_pid_nr(current)); 1969 list_splice_init(&priv->async_list, &list); 1970 } 1971 spin_unlock(&priv->req_lock); 1972 1973 if (!list_empty(&list)) { 1974 rmcd_debug(EXIT, "temp list not empty"); 1975 list_for_each_entry_safe(req, req_next, &list, node) { 1976 rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s", 1977 req->filp, req->cookie, 1978 completion_done(&req->req_comp)?"yes":"no"); 1979 list_del(&req->node); 1980 kref_put(&req->refcount, dma_req_free); 1981 } 1982 } 1983 1984 put_dma_channel(priv); 1985 wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo); 1986 1987 if (wret <= 0) { 1988 rmcd_error("%s(%d) failed waiting for DMA release err=%ld", 1989 current->comm, task_pid_nr(current), wret); 1990 } 1991 1992 if (priv->dmach != priv->md->dma_chan) { 1993 rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)", 1994 filp, current->comm, task_pid_nr(current)); 1995 rio_release_dma(priv->dmach); 1996 } else { 1997 rmcd_debug(EXIT, "Adjust default DMA channel refcount"); 1998 kref_put(&md->dma_ref, mport_release_def_dma); 1999 } 2000 2001 priv->dmach = NULL; 2002} 2003#else 2004#define mport_cdev_release_dma(priv) do {} while (0) 2005#endif 2006 2007/* 2008 * mport_cdev_release() - Release character device 2009 */ 2010static int mport_cdev_release(struct inode *inode, struct file *filp) 2011{ 2012 struct mport_cdev_priv *priv = filp->private_data; 2013 struct mport_dev *chdev; 2014 struct rio_mport_pw_filter *pw_filter, *pw_filter_next; 2015 struct rio_mport_db_filter *db_filter, *db_filter_next; 2016 struct rio_mport_mapping *map, *_map; 2017 unsigned long flags; 2018 2019 rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp); 2020 2021 chdev = priv->md; 2022 mport_cdev_release_dma(filp); 2023 2024 priv->event_mask = 0; 2025 2026 spin_lock_irqsave(&chdev->pw_lock, flags); 2027 if (!list_empty(&priv->pw_filters)) { 2028 list_for_each_entry_safe(pw_filter, pw_filter_next, 2029 &priv->pw_filters, priv_node) 2030 rio_mport_delete_pw_filter(pw_filter); 2031 } 2032 spin_unlock_irqrestore(&chdev->pw_lock, flags); 2033 2034 spin_lock_irqsave(&chdev->db_lock, flags); 2035 list_for_each_entry_safe(db_filter, db_filter_next, 2036 &priv->db_filters, priv_node) { 2037 rio_mport_delete_db_filter(db_filter); 2038 } 2039 spin_unlock_irqrestore(&chdev->db_lock, flags); 2040 2041 kfifo_free(&priv->event_fifo); 2042 2043 mutex_lock(&chdev->buf_mutex); 2044 list_for_each_entry_safe(map, _map, &chdev->mappings, node) { 2045 if (map->filp == filp) { 2046 rmcd_debug(EXIT, "release mapping %p filp=%p", 2047 map->virt_addr, filp); 2048 kref_put(&map->ref, mport_release_mapping); 2049 } 2050 } 2051 mutex_unlock(&chdev->buf_mutex); 2052 2053 mport_cdev_fasync(-1, filp, 0); 2054 filp->private_data = NULL; 2055 mutex_lock(&chdev->file_mutex); 2056 list_del(&priv->list); 2057 mutex_unlock(&chdev->file_mutex); 2058 put_device(&chdev->dev); 2059 kfree(priv); 2060 return 0; 2061} 2062 2063/* 2064 * mport_cdev_ioctl() - IOCTLs for character device 2065 */ 2066static long mport_cdev_ioctl(struct file *filp, 2067 unsigned int cmd, unsigned long arg) 2068{ 2069 int err = -EINVAL; 2070 struct mport_cdev_priv *data = filp->private_data; 2071 struct mport_dev *md = data->md; 2072 2073 if (atomic_read(&md->active) == 0) 2074 return -ENODEV; 2075 2076 switch (cmd) { 2077 case RIO_MPORT_MAINT_READ_LOCAL: 2078 return rio_mport_maint_rd(data, (void __user *)arg, 1); 2079 case RIO_MPORT_MAINT_WRITE_LOCAL: 2080 return rio_mport_maint_wr(data, (void __user *)arg, 1); 2081 case RIO_MPORT_MAINT_READ_REMOTE: 2082 return rio_mport_maint_rd(data, (void __user *)arg, 0); 2083 case RIO_MPORT_MAINT_WRITE_REMOTE: 2084 return rio_mport_maint_wr(data, (void __user *)arg, 0); 2085 case RIO_MPORT_MAINT_HDID_SET: 2086 return maint_hdid_set(data, (void __user *)arg); 2087 case RIO_MPORT_MAINT_COMPTAG_SET: 2088 return maint_comptag_set(data, (void __user *)arg); 2089 case RIO_MPORT_MAINT_PORT_IDX_GET: 2090 return maint_port_idx_get(data, (void __user *)arg); 2091 case RIO_MPORT_GET_PROPERTIES: 2092 md->properties.hdid = md->mport->host_deviceid; 2093 if (copy_to_user((void __user *)arg, &(md->properties), 2094 sizeof(md->properties))) 2095 return -EFAULT; 2096 return 0; 2097 case RIO_ENABLE_DOORBELL_RANGE: 2098 return rio_mport_add_db_filter(data, (void __user *)arg); 2099 case RIO_DISABLE_DOORBELL_RANGE: 2100 return rio_mport_remove_db_filter(data, (void __user *)arg); 2101 case RIO_ENABLE_PORTWRITE_RANGE: 2102 return rio_mport_add_pw_filter(data, (void __user *)arg); 2103 case RIO_DISABLE_PORTWRITE_RANGE: 2104 return rio_mport_remove_pw_filter(data, (void __user *)arg); 2105 case RIO_SET_EVENT_MASK: 2106 data->event_mask = (u32)arg; 2107 return 0; 2108 case RIO_GET_EVENT_MASK: 2109 if (copy_to_user((void __user *)arg, &data->event_mask, 2110 sizeof(u32))) 2111 return -EFAULT; 2112 return 0; 2113 case RIO_MAP_OUTBOUND: 2114 return rio_mport_obw_map(filp, (void __user *)arg); 2115 case RIO_MAP_INBOUND: 2116 return rio_mport_map_inbound(filp, (void __user *)arg); 2117 case RIO_UNMAP_OUTBOUND: 2118 return rio_mport_obw_free(filp, (void __user *)arg); 2119 case RIO_UNMAP_INBOUND: 2120 return rio_mport_inbound_free(filp, (void __user *)arg); 2121 case RIO_ALLOC_DMA: 2122 return rio_mport_alloc_dma(filp, (void __user *)arg); 2123 case RIO_FREE_DMA: 2124 return rio_mport_free_dma(filp, (void __user *)arg); 2125 case RIO_WAIT_FOR_ASYNC: 2126 return rio_mport_wait_for_async_dma(filp, (void __user *)arg); 2127 case RIO_TRANSFER: 2128 return rio_mport_transfer_ioctl(filp, (void __user *)arg); 2129 case RIO_DEV_ADD: 2130 return rio_mport_add_riodev(data, (void __user *)arg); 2131 case RIO_DEV_DEL: 2132 return rio_mport_del_riodev(data, (void __user *)arg); 2133 default: 2134 break; 2135 } 2136 2137 return err; 2138} 2139 2140/* 2141 * mport_release_mapping - free mapping resources and info structure 2142 * @ref: a pointer to the kref within struct rio_mport_mapping 2143 * 2144 * NOTE: Shall be called while holding buf_mutex. 2145 */ 2146static void mport_release_mapping(struct kref *ref) 2147{ 2148 struct rio_mport_mapping *map = 2149 container_of(ref, struct rio_mport_mapping, ref); 2150 struct rio_mport *mport = map->md->mport; 2151 2152 rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s", 2153 map->dir, map->virt_addr, 2154 &map->phys_addr, mport->name); 2155 2156 list_del(&map->node); 2157 2158 switch (map->dir) { 2159 case MAP_INBOUND: 2160 rio_unmap_inb_region(mport, map->phys_addr); 2161 fallthrough; 2162 case MAP_DMA: 2163 dma_free_coherent(mport->dev.parent, map->size, 2164 map->virt_addr, map->phys_addr); 2165 break; 2166 case MAP_OUTBOUND: 2167 rio_unmap_outb_region(mport, map->rioid, map->rio_addr); 2168 break; 2169 } 2170 kfree(map); 2171} 2172 2173static void mport_mm_open(struct vm_area_struct *vma) 2174{ 2175 struct rio_mport_mapping *map = vma->vm_private_data; 2176 2177 rmcd_debug(MMAP, "%pad", &map->phys_addr); 2178 kref_get(&map->ref); 2179} 2180 2181static void mport_mm_close(struct vm_area_struct *vma) 2182{ 2183 struct rio_mport_mapping *map = vma->vm_private_data; 2184 2185 rmcd_debug(MMAP, "%pad", &map->phys_addr); 2186 mutex_lock(&map->md->buf_mutex); 2187 kref_put(&map->ref, mport_release_mapping); 2188 mutex_unlock(&map->md->buf_mutex); 2189} 2190 2191static const struct vm_operations_struct vm_ops = { 2192 .open = mport_mm_open, 2193 .close = mport_mm_close, 2194}; 2195 2196static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma) 2197{ 2198 struct mport_cdev_priv *priv = filp->private_data; 2199 struct mport_dev *md; 2200 size_t size = vma->vm_end - vma->vm_start; 2201 dma_addr_t baddr; 2202 unsigned long offset; 2203 int found = 0, ret; 2204 struct rio_mport_mapping *map; 2205 2206 rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx", 2207 (unsigned int)size, vma->vm_pgoff); 2208 2209 md = priv->md; 2210 baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT); 2211 2212 mutex_lock(&md->buf_mutex); 2213 list_for_each_entry(map, &md->mappings, node) { 2214 if (baddr >= map->phys_addr && 2215 baddr < (map->phys_addr + map->size)) { 2216 found = 1; 2217 break; 2218 } 2219 } 2220 mutex_unlock(&md->buf_mutex); 2221 2222 if (!found) 2223 return -ENOMEM; 2224 2225 offset = baddr - map->phys_addr; 2226 2227 if (size + offset > map->size) 2228 return -EINVAL; 2229 2230 vma->vm_pgoff = offset >> PAGE_SHIFT; 2231 rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff); 2232 2233 if (map->dir == MAP_INBOUND || map->dir == MAP_DMA) 2234 ret = dma_mmap_coherent(md->mport->dev.parent, vma, 2235 map->virt_addr, map->phys_addr, map->size); 2236 else if (map->dir == MAP_OUTBOUND) { 2237 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 2238 ret = vm_iomap_memory(vma, map->phys_addr, map->size); 2239 } else { 2240 rmcd_error("Attempt to mmap unsupported mapping type"); 2241 ret = -EIO; 2242 } 2243 2244 if (!ret) { 2245 vma->vm_private_data = map; 2246 vma->vm_ops = &vm_ops; 2247 mport_mm_open(vma); 2248 } else { 2249 rmcd_error("MMAP exit with err=%d", ret); 2250 } 2251 2252 return ret; 2253} 2254 2255static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait) 2256{ 2257 struct mport_cdev_priv *priv = filp->private_data; 2258 2259 poll_wait(filp, &priv->event_rx_wait, wait); 2260 if (kfifo_len(&priv->event_fifo)) 2261 return EPOLLIN | EPOLLRDNORM; 2262 2263 return 0; 2264} 2265 2266static ssize_t mport_read(struct file *filp, char __user *buf, size_t count, 2267 loff_t *ppos) 2268{ 2269 struct mport_cdev_priv *priv = filp->private_data; 2270 int copied; 2271 ssize_t ret; 2272 2273 if (!count) 2274 return 0; 2275 2276 if (kfifo_is_empty(&priv->event_fifo) && 2277 (filp->f_flags & O_NONBLOCK)) 2278 return -EAGAIN; 2279 2280 if (count % sizeof(struct rio_event)) 2281 return -EINVAL; 2282 2283 ret = wait_event_interruptible(priv->event_rx_wait, 2284 kfifo_len(&priv->event_fifo) != 0); 2285 if (ret) 2286 return ret; 2287 2288 while (ret < count) { 2289 if (kfifo_to_user(&priv->event_fifo, buf, 2290 sizeof(struct rio_event), &copied)) 2291 return -EFAULT; 2292 ret += copied; 2293 buf += copied; 2294 } 2295 2296 return ret; 2297} 2298 2299static ssize_t mport_write(struct file *filp, const char __user *buf, 2300 size_t count, loff_t *ppos) 2301{ 2302 struct mport_cdev_priv *priv = filp->private_data; 2303 struct rio_mport *mport = priv->md->mport; 2304 struct rio_event event; 2305 int len, ret; 2306 2307 if (!count) 2308 return 0; 2309 2310 if (count % sizeof(event)) 2311 return -EINVAL; 2312 2313 len = 0; 2314 while ((count - len) >= (int)sizeof(event)) { 2315 if (copy_from_user(&event, buf, sizeof(event))) 2316 return -EFAULT; 2317 2318 if (event.header != RIO_DOORBELL) 2319 return -EINVAL; 2320 2321 ret = rio_mport_send_doorbell(mport, 2322 event.u.doorbell.rioid, 2323 event.u.doorbell.payload); 2324 if (ret < 0) 2325 return ret; 2326 2327 len += sizeof(event); 2328 buf += sizeof(event); 2329 } 2330 2331 return len; 2332} 2333 2334static const struct file_operations mport_fops = { 2335 .owner = THIS_MODULE, 2336 .open = mport_cdev_open, 2337 .release = mport_cdev_release, 2338 .poll = mport_cdev_poll, 2339 .read = mport_read, 2340 .write = mport_write, 2341 .mmap = mport_cdev_mmap, 2342 .fasync = mport_cdev_fasync, 2343 .unlocked_ioctl = mport_cdev_ioctl 2344}; 2345 2346/* 2347 * Character device management 2348 */ 2349 2350static void mport_device_release(struct device *dev) 2351{ 2352 struct mport_dev *md; 2353 2354 rmcd_debug(EXIT, "%s", dev_name(dev)); 2355 md = container_of(dev, struct mport_dev, dev); 2356 kfree(md); 2357} 2358 2359/* 2360 * mport_cdev_add() - Create mport_dev from rio_mport 2361 * @mport: RapidIO master port 2362 */ 2363static struct mport_dev *mport_cdev_add(struct rio_mport *mport) 2364{ 2365 int ret = 0; 2366 struct mport_dev *md; 2367 struct rio_mport_attr attr; 2368 2369 md = kzalloc(sizeof(*md), GFP_KERNEL); 2370 if (!md) { 2371 rmcd_error("Unable allocate a device object"); 2372 return NULL; 2373 } 2374 2375 md->mport = mport; 2376 mutex_init(&md->buf_mutex); 2377 mutex_init(&md->file_mutex); 2378 INIT_LIST_HEAD(&md->file_list); 2379 2380 device_initialize(&md->dev); 2381 md->dev.devt = MKDEV(MAJOR(dev_number), mport->id); 2382 md->dev.class = dev_class; 2383 md->dev.parent = &mport->dev; 2384 md->dev.release = mport_device_release; 2385 dev_set_name(&md->dev, DEV_NAME "%d", mport->id); 2386 atomic_set(&md->active, 1); 2387 2388 cdev_init(&md->cdev, &mport_fops); 2389 md->cdev.owner = THIS_MODULE; 2390 2391 INIT_LIST_HEAD(&md->doorbells); 2392 spin_lock_init(&md->db_lock); 2393 INIT_LIST_HEAD(&md->portwrites); 2394 spin_lock_init(&md->pw_lock); 2395 INIT_LIST_HEAD(&md->mappings); 2396 2397 md->properties.id = mport->id; 2398 md->properties.sys_size = mport->sys_size; 2399 md->properties.hdid = mport->host_deviceid; 2400 md->properties.index = mport->index; 2401 2402 /* The transfer_mode property will be returned through mport query 2403 * interface 2404 */ 2405#ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */ 2406 md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED; 2407#else 2408 md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER; 2409#endif 2410 2411 ret = cdev_device_add(&md->cdev, &md->dev); 2412 if (ret) { 2413 rmcd_error("Failed to register mport %d (err=%d)", 2414 mport->id, ret); 2415 goto err_cdev; 2416 } 2417 ret = rio_query_mport(mport, &attr); 2418 if (!ret) { 2419 md->properties.flags = attr.flags; 2420 md->properties.link_speed = attr.link_speed; 2421 md->properties.link_width = attr.link_width; 2422 md->properties.dma_max_sge = attr.dma_max_sge; 2423 md->properties.dma_max_size = attr.dma_max_size; 2424 md->properties.dma_align = attr.dma_align; 2425 md->properties.cap_sys_size = 0; 2426 md->properties.cap_transfer_mode = 0; 2427 md->properties.cap_addr_size = 0; 2428 } else 2429 pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n", 2430 mport->name, MAJOR(dev_number), mport->id); 2431 2432 mutex_lock(&mport_devs_lock); 2433 list_add_tail(&md->node, &mport_devs); 2434 mutex_unlock(&mport_devs_lock); 2435 2436 pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n", 2437 mport->name, MAJOR(dev_number), mport->id); 2438 2439 return md; 2440 2441err_cdev: 2442 put_device(&md->dev); 2443 return NULL; 2444} 2445 2446/* 2447 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release 2448 * associated DMA channels. 2449 */ 2450static void mport_cdev_terminate_dma(struct mport_dev *md) 2451{ 2452#ifdef CONFIG_RAPIDIO_DMA_ENGINE 2453 struct mport_cdev_priv *client; 2454 2455 rmcd_debug(DMA, "%s", dev_name(&md->dev)); 2456 2457 mutex_lock(&md->file_mutex); 2458 list_for_each_entry(client, &md->file_list, list) { 2459 if (client->dmach) { 2460 dmaengine_terminate_all(client->dmach); 2461 rio_release_dma(client->dmach); 2462 } 2463 } 2464 mutex_unlock(&md->file_mutex); 2465 2466 if (md->dma_chan) { 2467 dmaengine_terminate_all(md->dma_chan); 2468 rio_release_dma(md->dma_chan); 2469 md->dma_chan = NULL; 2470 } 2471#endif 2472} 2473 2474 2475/* 2476 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open 2477 * mport_cdev files. 2478 */ 2479static int mport_cdev_kill_fasync(struct mport_dev *md) 2480{ 2481 unsigned int files = 0; 2482 struct mport_cdev_priv *client; 2483 2484 mutex_lock(&md->file_mutex); 2485 list_for_each_entry(client, &md->file_list, list) { 2486 if (client->async_queue) 2487 kill_fasync(&client->async_queue, SIGIO, POLL_HUP); 2488 files++; 2489 } 2490 mutex_unlock(&md->file_mutex); 2491 return files; 2492} 2493 2494/* 2495 * mport_cdev_remove() - Remove mport character device 2496 * @dev: Mport device to remove 2497 */ 2498static void mport_cdev_remove(struct mport_dev *md) 2499{ 2500 struct rio_mport_mapping *map, *_map; 2501 2502 rmcd_debug(EXIT, "Remove %s cdev", md->mport->name); 2503 atomic_set(&md->active, 0); 2504 mport_cdev_terminate_dma(md); 2505 rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler); 2506 cdev_device_del(&md->cdev, &md->dev); 2507 mport_cdev_kill_fasync(md); 2508 2509 /* TODO: do we need to give clients some time to close file 2510 * descriptors? Simple wait for XX, or kref? 2511 */ 2512 2513 /* 2514 * Release DMA buffers allocated for the mport device. 2515 * Disable associated inbound Rapidio requests mapping if applicable. 2516 */ 2517 mutex_lock(&md->buf_mutex); 2518 list_for_each_entry_safe(map, _map, &md->mappings, node) { 2519 kref_put(&map->ref, mport_release_mapping); 2520 } 2521 mutex_unlock(&md->buf_mutex); 2522 2523 if (!list_empty(&md->mappings)) 2524 rmcd_warn("WARNING: %s pending mappings on removal", 2525 md->mport->name); 2526 2527 rio_release_inb_dbell(md->mport, 0, 0x0fff); 2528 2529 put_device(&md->dev); 2530} 2531 2532/* 2533 * RIO rio_mport_interface driver 2534 */ 2535 2536/* 2537 * mport_add_mport() - Add rio_mport from LDM device struct 2538 * @dev: Linux device model struct 2539 */ 2540static int mport_add_mport(struct device *dev) 2541{ 2542 struct rio_mport *mport = NULL; 2543 struct mport_dev *chdev = NULL; 2544 2545 mport = to_rio_mport(dev); 2546 if (!mport) 2547 return -ENODEV; 2548 2549 chdev = mport_cdev_add(mport); 2550 if (!chdev) 2551 return -ENODEV; 2552 2553 return 0; 2554} 2555 2556/* 2557 * mport_remove_mport() - Remove rio_mport from global list 2558 * TODO remove device from global mport_dev list 2559 */ 2560static void mport_remove_mport(struct device *dev) 2561{ 2562 struct rio_mport *mport = NULL; 2563 struct mport_dev *chdev; 2564 int found = 0; 2565 2566 mport = to_rio_mport(dev); 2567 rmcd_debug(EXIT, "Remove %s", mport->name); 2568 2569 mutex_lock(&mport_devs_lock); 2570 list_for_each_entry(chdev, &mport_devs, node) { 2571 if (chdev->mport->id == mport->id) { 2572 atomic_set(&chdev->active, 0); 2573 list_del(&chdev->node); 2574 found = 1; 2575 break; 2576 } 2577 } 2578 mutex_unlock(&mport_devs_lock); 2579 2580 if (found) 2581 mport_cdev_remove(chdev); 2582} 2583 2584/* the rio_mport_interface is used to handle local mport devices */ 2585static struct class_interface rio_mport_interface __refdata = { 2586 .class = &rio_mport_class, 2587 .add_dev = mport_add_mport, 2588 .remove_dev = mport_remove_mport, 2589}; 2590 2591/* 2592 * Linux kernel module 2593 */ 2594 2595/* 2596 * mport_init - Driver module loading 2597 */ 2598static int __init mport_init(void) 2599{ 2600 int ret; 2601 2602 /* Create device class needed by udev */ 2603 dev_class = class_create(DRV_NAME); 2604 if (IS_ERR(dev_class)) { 2605 rmcd_error("Unable to create " DRV_NAME " class"); 2606 return PTR_ERR(dev_class); 2607 } 2608 2609 ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME); 2610 if (ret < 0) 2611 goto err_chr; 2612 2613 rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number)); 2614 2615 /* Register to rio_mport_interface */ 2616 ret = class_interface_register(&rio_mport_interface); 2617 if (ret) { 2618 rmcd_error("class_interface_register() failed, err=%d", ret); 2619 goto err_cli; 2620 } 2621 2622 return 0; 2623 2624err_cli: 2625 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS); 2626err_chr: 2627 class_destroy(dev_class); 2628 return ret; 2629} 2630 2631/** 2632 * mport_exit - Driver module unloading 2633 */ 2634static void __exit mport_exit(void) 2635{ 2636 class_interface_unregister(&rio_mport_interface); 2637 class_destroy(dev_class); 2638 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS); 2639} 2640 2641module_init(mport_init); 2642module_exit(mport_exit); 2643