1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * RapidIO mport character device
5 * Copyright 2014-2015 Integrated Device Technology, Inc.
7 * Copyright 2014-2015 Prodrive Technologies
10 * Copyright (C) 2014 Texas Instruments Incorporated
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>
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>
28 #include <linux/slab.h>
29 #include <linux/vmalloc.h>
30 #include <linux/mman.h>
32 #include <linux/dma-mapping.h>
33 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
34 #include <linux/dmaengine.h>
37 #include <linux/rio.h>
38 #include <linux/rio_ids.h>
39 #include <linux/rio_drv.h>
40 #include <linux/rio_mport_cdev.h>
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"
49 /* Debug output filtering masks */
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 */
66 #define rmcd_debug(level, fmt, arg...) \
68 if (DBG_##level & dbg_level) \
69 pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
72 #define rmcd_debug(level, fmt, arg...) \
73 no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
76 #define rmcd_warn(fmt, arg...) \
77 pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)
79 #define rmcd_error(fmt, arg...) \
80 pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)
86 MODULE_DESCRIPTION("RapidIO mport character device driver");
87 MODULE_LICENSE("GPL");
88 MODULE_VERSION(DRV_VERSION);
90 static int dma_timeout = 3000; /* DMA transfer timeout in msec */
91 module_param(dma_timeout, int, S_IRUGO);
92 MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)");
95 static u32 dbg_level = DBG_NONE;
96 module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO);
97 MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
101 * An internal DMA coherent buffer
103 struct mport_dma_buf {
113 * Internal memory mapping structure
115 enum rio_mport_map_dir {
121 struct rio_mport_mapping {
122 struct list_head node;
123 struct mport_dev *md;
124 enum rio_mport_map_dir dir;
127 dma_addr_t phys_addr; /* for mmap */
128 void *virt_addr; /* kernel address, for dma_free_coherent */
130 struct kref ref; /* refcount of vmas sharing the mapping */
134 struct rio_mport_dma_map {
141 #define MPORT_MAX_DMA_BUFS 16
142 #define MPORT_EVENT_DEPTH 10
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
164 struct list_head node;
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;
174 struct list_head portwrites;
176 struct list_head mappings;
177 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
178 struct dma_chan *dma_chan;
180 struct completion comp;
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
198 struct mport_cdev_priv {
199 struct mport_dev *md;
200 struct fasync_struct *async_queue;
201 struct list_head list;
202 struct list_head db_filters;
203 struct list_head pw_filters;
204 struct kfifo event_fifo;
205 wait_queue_head_t event_rx_wait;
206 spinlock_t fifo_lock;
207 u32 event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
208 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
209 struct dma_chan *dmach;
210 struct list_head async_list;
212 struct mutex dma_lock;
214 struct completion comp;
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
225 struct rio_mport_pw_filter {
226 struct list_head md_node;
227 struct list_head priv_node;
228 struct mport_cdev_priv *priv;
229 struct rio_pw_filter filter;
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
239 struct rio_mport_db_filter {
240 struct list_head data_node;
241 struct list_head priv_node;
242 struct mport_cdev_priv *priv;
243 struct rio_doorbell_filter filter;
246 static LIST_HEAD(mport_devs);
247 static DEFINE_MUTEX(mport_devs_lock);
249 #if (0) /* used by commented out portion of poll function : FIXME */
250 static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
253 static struct class *dev_class;
254 static dev_t dev_number;
256 static void mport_release_mapping(struct kref *ref);
258 static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
261 struct rio_mport *mport = priv->md->mport;
262 struct rio_mport_maint_io maint_io;
268 if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
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)
276 buffer = vmalloc(maint_io.length);
279 length = maint_io.length/sizeof(u32);
280 offset = maint_io.offset;
282 for (i = 0; i < length; i++) {
284 ret = __rio_local_read_config_32(mport,
287 ret = rio_mport_read_config_32(mport, maint_io.rioid,
288 maint_io.hopcount, offset, &buffer[i]);
295 if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
296 buffer, maint_io.length)))
303 static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
306 struct rio_mport *mport = priv->md->mport;
307 struct rio_mport_maint_io maint_io;
311 int ret = -EINVAL, i;
313 if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
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)
321 buffer = vmalloc(maint_io.length);
324 length = maint_io.length;
326 if (unlikely(copy_from_user(buffer,
327 (void __user *)(uintptr_t)maint_io.buffer, length))) {
332 offset = maint_io.offset;
333 length /= sizeof(u32);
335 for (i = 0; i < length; i++) {
337 ret = __rio_local_write_config_32(mport,
340 ret = rio_mport_write_config_32(mport, maint_io.rioid,
356 * Inbound/outbound memory mapping functions
359 rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
360 u16 rioid, u64 raddr, u32 size,
363 struct rio_mport *mport = md->mport;
364 struct rio_mport_mapping *map;
367 rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);
369 map = kzalloc(sizeof(*map), GFP_KERNEL);
373 ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
377 map->dir = MAP_OUTBOUND;
379 map->rio_addr = raddr;
381 map->phys_addr = *paddr;
384 kref_init(&map->ref);
385 list_add_tail(&map->node, &md->mappings);
393 rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
394 u16 rioid, u64 raddr, u32 size,
397 struct rio_mport_mapping *map;
400 mutex_lock(&md->buf_mutex);
401 list_for_each_entry(map, &md->mappings, node) {
402 if (map->dir != MAP_OUTBOUND)
404 if (rioid == map->rioid &&
405 raddr == map->rio_addr && size == map->size) {
406 *paddr = map->phys_addr;
409 } else if (rioid == map->rioid &&
410 raddr < (map->rio_addr + map->size - 1) &&
411 (raddr + size) > map->rio_addr) {
417 /* If not found, create new */
419 err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
421 mutex_unlock(&md->buf_mutex);
425 static int rio_mport_obw_map(struct file *filp, void __user *arg)
427 struct mport_cdev_priv *priv = filp->private_data;
428 struct mport_dev *data = priv->md;
433 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
436 rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
437 map.rioid, map.rio_addr, map.length);
439 ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
440 map.rio_addr, map.length, &paddr);
442 rmcd_error("Failed to set OBW err= %d", ret);
448 if (unlikely(copy_to_user(arg, &map, sizeof(map))))
454 * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
456 * @priv: driver private data
457 * @arg: buffer handle returned by allocation routine
459 static int rio_mport_obw_free(struct file *filp, void __user *arg)
461 struct mport_cdev_priv *priv = filp->private_data;
462 struct mport_dev *md = priv->md;
464 struct rio_mport_mapping *map, *_map;
466 if (!md->mport->ops->unmap_outb)
467 return -EPROTONOSUPPORT;
469 if (copy_from_user(&handle, arg, sizeof(handle)))
472 rmcd_debug(OBW, "h=0x%llx", handle);
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);
480 kref_put(&map->ref, mport_release_mapping);
485 mutex_unlock(&md->buf_mutex);
491 * maint_hdid_set() - Set the host Device ID
492 * @priv: driver private data
495 static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
497 struct mport_dev *md = priv->md;
500 if (copy_from_user(&hdid, arg, sizeof(hdid)))
503 md->mport->host_deviceid = hdid;
504 md->properties.hdid = hdid;
505 rio_local_set_device_id(md->mport, hdid);
507 rmcd_debug(MPORT, "Set host device Id to %d", hdid);
513 * maint_comptag_set() - Set the host Component Tag
514 * @priv: driver private data
515 * @arg: Component Tag
517 static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg)
519 struct mport_dev *md = priv->md;
522 if (copy_from_user(&comptag, arg, sizeof(comptag)))
525 rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag);
527 rmcd_debug(MPORT, "Set host Component Tag to %d", comptag);
532 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
534 struct mport_dma_req {
535 struct kref refcount;
536 struct list_head node;
538 struct mport_cdev_priv *priv;
539 enum rio_transfer_sync sync;
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;
547 enum dma_status status;
548 struct completion req_comp;
551 static void mport_release_def_dma(struct kref *dma_ref)
553 struct mport_dev *md =
554 container_of(dma_ref, struct mport_dev, dma_ref);
556 rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id);
557 rio_release_dma(md->dma_chan);
561 static void mport_release_dma(struct kref *dma_ref)
563 struct mport_cdev_priv *priv =
564 container_of(dma_ref, struct mport_cdev_priv, dma_ref);
566 rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id);
567 complete(&priv->comp);
570 static void dma_req_free(struct kref *ref)
572 struct mport_dma_req *req = container_of(ref, struct mport_dma_req,
574 struct mport_cdev_priv *priv = req->priv;
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);
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);
590 kref_put(&priv->dma_ref, mport_release_dma);
595 static void dma_xfer_callback(void *param)
597 struct mport_dma_req *req = (struct mport_dma_req *)param;
598 struct mport_cdev_priv *priv = req->priv;
600 req->status = dma_async_is_tx_complete(priv->dmach, req->cookie,
602 complete(&req->req_comp);
603 kref_put(&req->refcount, dma_req_free);
607 * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
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.
613 static 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)
618 struct rio_dma_data tx_data;
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;
629 case RIO_EXCHANGE_NWRITE_R_ALL:
630 tx_data.wr_type = RDW_ALL_NWRITE_R;
632 case RIO_EXCHANGE_NWRITE_R:
633 tx_data.wr_type = RDW_LAST_NWRITE_R;
635 case RIO_EXCHANGE_DEFAULT:
636 tx_data.wr_type = RDW_DEFAULT;
639 return ERR_PTR(-EINVAL);
643 return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags);
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.
651 static int get_dma_channel(struct mport_cdev_priv *priv)
653 mutex_lock(&priv->dma_lock);
655 priv->dmach = rio_request_mport_dma(priv->md->mport);
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);
662 rmcd_error("Failed to get DMA channel");
663 mutex_unlock(&priv->dma_lock);
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);
674 kref_init(&priv->dma_ref);
675 init_completion(&priv->comp);
678 kref_get(&priv->dma_ref);
679 mutex_unlock(&priv->dma_lock);
683 static void put_dma_channel(struct mport_cdev_priv *priv)
685 kref_put(&priv->dma_ref, mport_release_dma);
689 * DMA transfer functions
691 static int do_dma_request(struct mport_dma_req *req,
692 struct rio_transfer_io *xfer,
693 enum rio_transfer_sync sync, int nents)
695 struct mport_cdev_priv *priv;
696 struct sg_table *sgt;
697 struct dma_chan *chan;
698 struct dma_async_tx_descriptor *tx;
700 unsigned long tmo = msecs_to_jiffies(dma_timeout);
701 enum dma_transfer_direction dir;
709 dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
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");
716 /* Initialize DMA transaction request */
717 tx = prep_dma_xfer(chan, xfer, sgt, nents, dir,
718 DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
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);
726 } else if (IS_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);
734 tx->callback = dma_xfer_callback;
735 tx->callback_param = req;
737 req->status = DMA_IN_PROGRESS;
738 kref_get(&req->refcount);
740 cookie = dmaengine_submit(tx);
741 req->cookie = cookie;
743 rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current),
744 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
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);
754 dma_async_issue_pending(chan);
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);
761 } else if (sync == RIO_TRANSFER_FAF)
764 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
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);
772 } else if (wret == -ERESTARTSYS) {
773 /* Wait_for_completion was interrupted by a signal but DMA may
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);
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);
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
806 rio_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)
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;
819 if (xfer->length == 0)
821 req = kzalloc(sizeof(*req), GFP_KERNEL);
825 ret = get_dma_channel(priv);
832 kref_init(&req->refcount);
833 init_completion(&req->req_comp);
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
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.
849 if (xfer->loc_addr) {
853 offset = lower_32_bits(offset_in_page(xfer->loc_addr));
854 nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
856 page_list = kmalloc_array(nr_pages,
857 sizeof(*page_list), GFP_KERNEL);
858 if (page_list == NULL) {
863 pinned = pin_user_pages_fast(
864 (unsigned long)xfer->loc_addr & PAGE_MASK,
866 dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
869 if (pinned != nr_pages) {
871 rmcd_error("pin_user_pages_fast err=%ld",
875 rmcd_error("pinned %ld out of %ld pages",
878 * Set nr_pages up to mean "how many pages to unpin, in
887 ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
888 offset, xfer->length, GFP_KERNEL);
890 rmcd_error("sg_alloc_table failed with err=%d", ret);
894 req->page_list = page_list;
895 req->nr_pages = nr_pages;
898 struct rio_mport_mapping *map;
900 baddr = (dma_addr_t)xfer->handle;
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)) {
911 mutex_unlock(&md->buf_mutex);
913 if (req->map == NULL) {
918 if (xfer->length + xfer->offset > req->map->size) {
923 ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
925 rmcd_error("sg_alloc_table failed for internal buf");
929 sg_set_buf(req->sgt.sgl,
930 req->map->virt_addr + (baddr - req->map->phys_addr) +
931 xfer->offset, xfer->length);
934 nents = dma_map_sg(chan->device->dev,
935 req->sgt.sgl, req->sgt.nents, dir);
937 rmcd_error("Failed to map SG list");
942 ret = do_dma_request(req, xfer, sync, nents);
945 if (sync == RIO_TRANSFER_ASYNC)
946 return ret; /* return ASYNC cookie */
948 rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
952 if (!req->page_list) {
953 unpin_user_pages(page_list, nr_pages);
957 kref_put(&req->refcount, dma_req_free);
961 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
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;
970 if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
973 if (transaction.count != 1) /* only single transfer for now */
976 if ((transaction.transfer_mode &
977 priv->md->properties.transfer_mode) == 0)
980 size = array_size(sizeof(*transfer), transaction.count);
981 transfer = vmalloc(size);
985 if (unlikely(copy_from_user(transfer,
986 (void __user *)(uintptr_t)transaction.block,
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]);
998 if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
1008 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
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;
1019 priv = (struct mport_cdev_priv *)filp->private_data;
1021 if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
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);
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);
1038 spin_unlock(&priv->req_lock);
1043 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
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");
1052 } else if (wret == -ERESTARTSYS) {
1053 /* Wait_for_completion was interrupted by a signal but DMA may
1054 * be still in progress
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");
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",
1073 if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1074 kref_put(&req->refcount, dma_req_free);
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);
1086 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1087 u64 size, struct rio_mport_mapping **mapping)
1089 struct rio_mport_mapping *map;
1091 map = kzalloc(sizeof(*map), GFP_KERNEL);
1095 map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1096 &map->phys_addr, GFP_KERNEL);
1097 if (map->virt_addr == NULL) {
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);
1115 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
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;
1123 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1126 ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1130 map.dma_handle = mapping->phys_addr;
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);
1142 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1144 struct mport_cdev_priv *priv = filp->private_data;
1145 struct mport_dev *md = priv->md;
1148 struct rio_mport_mapping *map, *_map;
1150 if (copy_from_user(&handle, arg, sizeof(handle)))
1152 rmcd_debug(EXIT, "filp=%p", filp);
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);
1163 mutex_unlock(&md->buf_mutex);
1165 if (ret == -EFAULT) {
1166 rmcd_debug(DMA, "ERR no matching mapping");
1173 static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1178 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1183 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1188 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1192 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1195 * Inbound/outbound memory mapping functions
1199 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1200 u64 raddr, u64 size,
1201 struct rio_mport_mapping **mapping)
1203 struct rio_mport *mport = md->mport;
1204 struct rio_mport_mapping *map;
1207 /* rio_map_inb_region() accepts u32 size */
1208 if (size > 0xffffffff)
1211 map = kzalloc(sizeof(*map), GFP_KERNEL);
1215 map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1216 &map->phys_addr, GFP_KERNEL);
1217 if (map->virt_addr == NULL) {
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);
1228 map->dir = MAP_INBOUND;
1229 map->rio_addr = raddr;
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);
1241 dma_free_coherent(mport->dev.parent, size,
1242 map->virt_addr, map->phys_addr);
1249 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1250 u64 raddr, u64 size,
1251 struct rio_mport_mapping **mapping)
1253 struct rio_mport_mapping *map;
1256 if (raddr == RIO_MAP_ANY_ADDR)
1259 mutex_lock(&md->buf_mutex);
1260 list_for_each_entry(map, &md->mappings, node) {
1261 if (map->dir != MAP_INBOUND)
1263 if (raddr == map->rio_addr && size == map->size) {
1264 /* allow exact match only */
1268 } else if (raddr < (map->rio_addr + map->size - 1) &&
1269 (raddr + size) > map->rio_addr) {
1274 mutex_unlock(&md->buf_mutex);
1279 /* not found, create new */
1280 return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1283 static int rio_mport_map_inbound(struct file *filp, void __user *arg)
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;
1291 if (!md->mport->ops->map_inb)
1292 return -EPROTONOSUPPORT;
1293 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1296 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1298 ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1299 map.length, &mapping);
1303 map.handle = mapping->phys_addr;
1304 map.rio_addr = mapping->rio_addr;
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);
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
1325 static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1327 struct mport_cdev_priv *priv = filp->private_data;
1328 struct mport_dev *md = priv->md;
1330 struct rio_mport_mapping *map, *_map;
1332 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1334 if (!md->mport->ops->unmap_inb)
1335 return -EPROTONOSUPPORT;
1337 if (copy_from_user(&handle, arg, sizeof(handle)))
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) {
1345 kref_put(&map->ref, mport_release_mapping);
1350 mutex_unlock(&md->buf_mutex);
1356 * maint_port_idx_get() - Get the port index of the mport instance
1357 * @priv: driver private data
1360 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1362 struct mport_dev *md = priv->md;
1363 u32 port_idx = md->mport->index;
1365 rmcd_debug(MPORT, "port_index=%d", port_idx);
1367 if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1373 static int rio_mport_add_event(struct mport_cdev_priv *priv,
1374 struct rio_event *event)
1378 if (!(priv->event_mask & event->header))
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);
1387 wake_up_interruptible(&priv->event_rx_wait);
1390 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1397 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1398 u16 src, u16 dst, u16 info)
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;
1406 event.header = RIO_DOORBELL;
1407 event.u.doorbell.rioid = src;
1408 event.u.doorbell.payload = info;
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);
1422 spin_unlock(&data->db_lock);
1425 dev_warn(&data->dev,
1426 "%s: spurious DB received from 0x%x, info=0x%04x\n",
1427 __func__, src, info);
1430 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
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;
1439 if (copy_from_user(&filter, arg, sizeof(filter)))
1442 if (filter.low > filter.high)
1445 ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1446 rio_mport_doorbell_handler);
1448 rmcd_error("%s failed to register IBDB, err=%d",
1449 dev_name(&md->dev), ret);
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);
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);
1469 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1471 list_del(&db_filter->data_node);
1472 list_del(&db_filter->priv_node);
1476 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1479 struct rio_mport_db_filter *db_filter;
1480 struct rio_doorbell_filter filter;
1481 unsigned long flags;
1484 if (copy_from_user(&filter, arg, sizeof(filter)))
1487 if (filter.low > filter.high)
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);
1500 spin_unlock_irqrestore(&priv->md->db_lock, flags);
1503 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1508 static int rio_mport_match_pw(union rio_pw_msg *msg,
1509 struct rio_pw_filter *filter)
1511 if ((msg->em.comptag & filter->mask) < filter->low ||
1512 (msg->em.comptag & filter->mask) > filter->high)
1517 static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1518 union rio_pw_msg *msg, int step)
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;
1526 event.header = RIO_PORTWRITE;
1527 memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
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);
1538 spin_unlock(&md->pw_lock);
1541 printk_ratelimited(KERN_WARNING DRV_NAME
1542 ": mport%d received spurious PW from 0x%08x\n",
1543 mport->id, msg->em.comptag);
1549 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
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;
1558 if (copy_from_user(&filter, arg, sizeof(filter)))
1561 pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1562 if (pw_filter == NULL)
1565 pw_filter->filter = filter;
1566 pw_filter->priv = priv;
1567 spin_lock_irqsave(&md->pw_lock, flags);
1568 if (list_empty(&md->portwrites))
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);
1577 ret = rio_add_mport_pw_handler(md->mport, md,
1578 rio_mport_pw_handler);
1581 "%s: failed to add IB_PW handler, err=%d\n",
1585 rio_pw_enable(md->mport, 1);
1591 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1593 list_del(&pw_filter->md_node);
1594 list_del(&pw_filter->priv_node);
1598 static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1599 struct rio_pw_filter *b)
1601 if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1606 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
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;
1616 if (copy_from_user(&filter, arg, sizeof(filter)))
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);
1628 if (list_empty(&md->portwrites))
1630 spin_unlock_irqrestore(&md->pw_lock, flags);
1633 rio_del_mport_pw_handler(md->mport, priv->md,
1634 rio_mport_pw_handler);
1635 rio_pw_enable(md->mport, 0);
1642 * rio_release_dev - release routine for kernel RIO device object
1643 * @dev: kernel device object associated with a RIO device structure
1645 * Frees a RIO device struct associated a RIO device struct.
1646 * The RIO device struct is freed.
1648 static void rio_release_dev(struct device *dev)
1650 struct rio_dev *rdev;
1652 rdev = to_rio_dev(dev);
1653 pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1658 static void rio_release_net(struct device *dev)
1660 struct rio_net *net;
1662 net = to_rio_net(dev);
1663 rmcd_debug(RDEV, "net_%d", net->id);
1669 * rio_mport_add_riodev - creates a kernel RIO device object
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.
1676 static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
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;
1692 if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1694 dev_info.name[sizeof(dev_info.name) - 1] = '\0';
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);
1699 dev = bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name);
1701 rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1706 size = sizeof(*rdev);
1708 destid = dev_info.destid;
1709 hopcount = dev_info.hopcount;
1711 if (rio_mport_read_config_32(mport, destid, hopcount,
1712 RIO_PEF_CAR, &rval))
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));
1721 rdev = kzalloc(size, GFP_KERNEL);
1725 if (mport->net == NULL) {
1726 struct rio_net *net;
1728 net = rio_alloc_net(mport);
1731 rmcd_debug(RDEV, "failed to allocate net object");
1735 net->id = mport->id;
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);
1742 rmcd_debug(RDEV, "failed to register net, err=%d", err);
1748 rdev->net = mport->net;
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,
1757 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
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,
1763 rdev->asm_rev = rval >> 16;
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);
1770 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1771 hopcount, RIO_EFB_ERR_MGMNT);
1774 rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1776 rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
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;
1784 if (rdev->pef & RIO_PEF_SWITCH) {
1785 rswitch = rdev->rswitch;
1786 rswitch->route_table = NULL;
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);
1795 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1796 rdev->comp_tag & RIO_CTAG_UDEVID);
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;
1803 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1804 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1806 err = rio_add_device(rdev);
1808 put_device(&rdev->dev);
1820 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1822 struct rio_rdev_info dev_info;
1823 struct rio_dev *rdev = NULL;
1825 struct rio_mport *mport;
1826 struct rio_net *net;
1828 if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1830 dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1832 mport = priv->md->mport;
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,
1839 rdev = to_rio_dev(dev);
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)
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,
1860 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1862 if (list_empty(&net->devices)) {
1871 * Mport cdev management
1875 * mport_cdev_open() - Open character device (mport)
1877 static int mport_cdev_open(struct inode *inode, struct file *filp)
1880 int minor = iminor(inode);
1881 struct mport_dev *chdev;
1882 struct mport_cdev_priv *priv;
1884 /* Test for valid device */
1885 if (minor >= RIO_MAX_MPORTS) {
1886 rmcd_error("Invalid minor device number");
1890 chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1892 rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1894 if (atomic_read(&chdev->active) == 0)
1897 get_device(&chdev->dev);
1899 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1901 put_device(&chdev->dev);
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,
1915 put_device(&chdev->dev);
1916 dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
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);
1926 mutex_lock(&chdev->file_mutex);
1927 list_add_tail(&priv->list, &chdev->file_list);
1928 mutex_unlock(&chdev->file_mutex);
1930 filp->private_data = priv;
1938 static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1940 struct mport_cdev_priv *priv = filp->private_data;
1942 return fasync_helper(fd, filp, mode, &priv->async_queue);
1945 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1946 static void mport_cdev_release_dma(struct file *filp)
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);
1955 rmcd_debug(EXIT, "from filp=%p %s(%d)",
1956 filp, current->comm, task_pid_nr(current));
1959 rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
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);
1971 spin_unlock(&priv->req_lock);
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);
1984 put_dma_channel(priv);
1985 wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
1988 rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
1989 current->comm, task_pid_nr(current), wret);
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);
1997 rmcd_debug(EXIT, "Adjust default DMA channel refcount");
1998 kref_put(&md->dma_ref, mport_release_def_dma);
2004 #define mport_cdev_release_dma(priv) do {} while (0)
2008 * mport_cdev_release() - Release character device
2010 static int mport_cdev_release(struct inode *inode, struct file *filp)
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;
2019 rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2022 mport_cdev_release_dma(filp);
2024 priv->event_mask = 0;
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);
2032 spin_unlock_irqrestore(&chdev->pw_lock, flags);
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);
2039 spin_unlock_irqrestore(&chdev->db_lock, flags);
2041 kfifo_free(&priv->event_fifo);
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);
2051 mutex_unlock(&chdev->buf_mutex);
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);
2064 * mport_cdev_ioctl() - IOCTLs for character device
2066 static long mport_cdev_ioctl(struct file *filp,
2067 unsigned int cmd, unsigned long arg)
2070 struct mport_cdev_priv *data = filp->private_data;
2071 struct mport_dev *md = data->md;
2073 if (atomic_read(&md->active) == 0)
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)))
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;
2108 case RIO_GET_EVENT_MASK:
2109 if (copy_to_user((void __user *)arg, &data->event_mask,
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);
2122 return rio_mport_alloc_dma(filp, (void __user *)arg);
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);
2128 return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2130 return rio_mport_add_riodev(data, (void __user *)arg);
2132 return rio_mport_del_riodev(data, (void __user *)arg);
2141 * mport_release_mapping - free mapping resources and info structure
2142 * @ref: a pointer to the kref within struct rio_mport_mapping
2144 * NOTE: Shall be called while holding buf_mutex.
2146 static void mport_release_mapping(struct kref *ref)
2148 struct rio_mport_mapping *map =
2149 container_of(ref, struct rio_mport_mapping, ref);
2150 struct rio_mport *mport = map->md->mport;
2152 rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2153 map->dir, map->virt_addr,
2154 &map->phys_addr, mport->name);
2156 list_del(&map->node);
2160 rio_unmap_inb_region(mport, map->phys_addr);
2163 dma_free_coherent(mport->dev.parent, map->size,
2164 map->virt_addr, map->phys_addr);
2167 rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2173 static void mport_mm_open(struct vm_area_struct *vma)
2175 struct rio_mport_mapping *map = vma->vm_private_data;
2177 rmcd_debug(MMAP, "%pad", &map->phys_addr);
2178 kref_get(&map->ref);
2181 static void mport_mm_close(struct vm_area_struct *vma)
2183 struct rio_mport_mapping *map = vma->vm_private_data;
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);
2191 static const struct vm_operations_struct vm_ops = {
2192 .open = mport_mm_open,
2193 .close = mport_mm_close,
2196 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2198 struct mport_cdev_priv *priv = filp->private_data;
2199 struct mport_dev *md;
2200 size_t size = vma->vm_end - vma->vm_start;
2202 unsigned long offset;
2204 struct rio_mport_mapping *map;
2206 rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2207 (unsigned int)size, vma->vm_pgoff);
2210 baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
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)) {
2220 mutex_unlock(&md->buf_mutex);
2225 offset = baddr - map->phys_addr;
2227 if (size + offset > map->size)
2230 vma->vm_pgoff = offset >> PAGE_SHIFT;
2231 rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
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);
2240 rmcd_error("Attempt to mmap unsupported mapping type");
2245 vma->vm_private_data = map;
2246 vma->vm_ops = &vm_ops;
2249 rmcd_error("MMAP exit with err=%d", ret);
2255 static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait)
2257 struct mport_cdev_priv *priv = filp->private_data;
2259 poll_wait(filp, &priv->event_rx_wait, wait);
2260 if (kfifo_len(&priv->event_fifo))
2261 return EPOLLIN | EPOLLRDNORM;
2266 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2269 struct mport_cdev_priv *priv = filp->private_data;
2276 if (kfifo_is_empty(&priv->event_fifo) &&
2277 (filp->f_flags & O_NONBLOCK))
2280 if (count % sizeof(struct rio_event))
2283 ret = wait_event_interruptible(priv->event_rx_wait,
2284 kfifo_len(&priv->event_fifo) != 0);
2288 while (ret < count) {
2289 if (kfifo_to_user(&priv->event_fifo, buf,
2290 sizeof(struct rio_event), &copied))
2299 static ssize_t mport_write(struct file *filp, const char __user *buf,
2300 size_t count, loff_t *ppos)
2302 struct mport_cdev_priv *priv = filp->private_data;
2303 struct rio_mport *mport = priv->md->mport;
2304 struct rio_event event;
2310 if (count % sizeof(event))
2314 while ((count - len) >= (int)sizeof(event)) {
2315 if (copy_from_user(&event, buf, sizeof(event)))
2318 if (event.header != RIO_DOORBELL)
2321 ret = rio_mport_send_doorbell(mport,
2322 event.u.doorbell.rioid,
2323 event.u.doorbell.payload);
2327 len += sizeof(event);
2328 buf += sizeof(event);
2334 static 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,
2340 .write = mport_write,
2341 .mmap = mport_cdev_mmap,
2342 .fasync = mport_cdev_fasync,
2343 .unlocked_ioctl = mport_cdev_ioctl
2347 * Character device management
2350 static void mport_device_release(struct device *dev)
2352 struct mport_dev *md;
2354 rmcd_debug(EXIT, "%s", dev_name(dev));
2355 md = container_of(dev, struct mport_dev, dev);
2360 * mport_cdev_add() - Create mport_dev from rio_mport
2361 * @mport: RapidIO master port
2363 static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2366 struct mport_dev *md;
2367 struct rio_mport_attr attr;
2369 md = kzalloc(sizeof(*md), GFP_KERNEL);
2371 rmcd_error("Unable allocate a device object");
2376 mutex_init(&md->buf_mutex);
2377 mutex_init(&md->file_mutex);
2378 INIT_LIST_HEAD(&md->file_list);
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);
2388 cdev_init(&md->cdev, &mport_fops);
2389 md->cdev.owner = THIS_MODULE;
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);
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;
2402 /* The transfer_mode property will be returned through mport query
2405 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2406 md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2408 md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2411 ret = cdev_device_add(&md->cdev, &md->dev);
2413 rmcd_error("Failed to register mport %d (err=%d)",
2417 ret = rio_query_mport(mport, &attr);
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;
2429 pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2430 mport->name, MAJOR(dev_number), mport->id);
2432 mutex_lock(&mport_devs_lock);
2433 list_add_tail(&md->node, &mport_devs);
2434 mutex_unlock(&mport_devs_lock);
2436 pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2437 mport->name, MAJOR(dev_number), mport->id);
2442 put_device(&md->dev);
2447 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2448 * associated DMA channels.
2450 static void mport_cdev_terminate_dma(struct mport_dev *md)
2452 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2453 struct mport_cdev_priv *client;
2455 rmcd_debug(DMA, "%s", dev_name(&md->dev));
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);
2464 mutex_unlock(&md->file_mutex);
2467 dmaengine_terminate_all(md->dma_chan);
2468 rio_release_dma(md->dma_chan);
2469 md->dma_chan = NULL;
2476 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2479 static int mport_cdev_kill_fasync(struct mport_dev *md)
2481 unsigned int files = 0;
2482 struct mport_cdev_priv *client;
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);
2490 mutex_unlock(&md->file_mutex);
2495 * mport_cdev_remove() - Remove mport character device
2496 * @dev: Mport device to remove
2498 static void mport_cdev_remove(struct mport_dev *md)
2500 struct rio_mport_mapping *map, *_map;
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);
2509 /* TODO: do we need to give clients some time to close file
2510 * descriptors? Simple wait for XX, or kref?
2514 * Release DMA buffers allocated for the mport device.
2515 * Disable associated inbound Rapidio requests mapping if applicable.
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);
2521 mutex_unlock(&md->buf_mutex);
2523 if (!list_empty(&md->mappings))
2524 rmcd_warn("WARNING: %s pending mappings on removal",
2527 rio_release_inb_dbell(md->mport, 0, 0x0fff);
2529 put_device(&md->dev);
2533 * RIO rio_mport_interface driver
2537 * mport_add_mport() - Add rio_mport from LDM device struct
2538 * @dev: Linux device model struct
2540 static int mport_add_mport(struct device *dev)
2542 struct rio_mport *mport = NULL;
2543 struct mport_dev *chdev = NULL;
2545 mport = to_rio_mport(dev);
2549 chdev = mport_cdev_add(mport);
2557 * mport_remove_mport() - Remove rio_mport from global list
2558 * TODO remove device from global mport_dev list
2560 static void mport_remove_mport(struct device *dev)
2562 struct rio_mport *mport = NULL;
2563 struct mport_dev *chdev;
2566 mport = to_rio_mport(dev);
2567 rmcd_debug(EXIT, "Remove %s", mport->name);
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);
2578 mutex_unlock(&mport_devs_lock);
2581 mport_cdev_remove(chdev);
2584 /* the rio_mport_interface is used to handle local mport devices */
2585 static struct class_interface rio_mport_interface __refdata = {
2586 .class = &rio_mport_class,
2587 .add_dev = mport_add_mport,
2588 .remove_dev = mport_remove_mport,
2592 * Linux kernel module
2596 * mport_init - Driver module loading
2598 static int __init mport_init(void)
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);
2609 ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2613 rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2615 /* Register to rio_mport_interface */
2616 ret = class_interface_register(&rio_mport_interface);
2618 rmcd_error("class_interface_register() failed, err=%d", ret);
2625 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2627 class_destroy(dev_class);
2632 * mport_exit - Driver module unloading
2634 static void __exit mport_exit(void)
2636 class_interface_unregister(&rio_mport_interface);
2637 class_destroy(dev_class);
2638 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2641 module_init(mport_init);
2642 module_exit(mport_exit);