2 * RapidIO mport character device
4 * Copyright 2014-2015 Integrated Device Technology, Inc.
5 * Alexandre Bounine <alexandre.bounine@idt.com>
6 * Copyright 2014-2015 Prodrive Technologies
7 * Andre van Herk <andre.van.herk@prodrive-technologies.com>
8 * Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
9 * Copyright (C) 2014 Texas Instruments Incorporated
10 * Aurelien Jacquiot <a-jacquiot@ti.com>
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/cdev.h>
20 #include <linux/ioctl.h>
21 #include <linux/uaccess.h>
22 #include <linux/list.h>
24 #include <linux/err.h>
25 #include <linux/net.h>
26 #include <linux/poll.h>
27 #include <linux/spinlock.h>
28 #include <linux/sched.h>
29 #include <linux/kfifo.h>
32 #include <linux/slab.h>
33 #include <linux/vmalloc.h>
34 #include <linux/mman.h>
36 #include <linux/dma-mapping.h>
37 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
38 #include <linux/dmaengine.h>
41 #include <linux/rio.h>
42 #include <linux/rio_ids.h>
43 #include <linux/rio_drv.h>
44 #include <linux/rio_mport_cdev.h>
48 #define DRV_NAME "rio_mport"
49 #define DRV_PREFIX DRV_NAME ": "
50 #define DEV_NAME "rio_mport"
51 #define DRV_VERSION "1.0.0"
53 /* Debug output filtering masks */
56 DBG_INIT
= BIT(0), /* driver init */
57 DBG_EXIT
= BIT(1), /* driver exit */
58 DBG_MPORT
= BIT(2), /* mport add/remove */
59 DBG_RDEV
= BIT(3), /* RapidIO device add/remove */
60 DBG_DMA
= BIT(4), /* DMA transfer messages */
61 DBG_MMAP
= BIT(5), /* mapping messages */
62 DBG_IBW
= BIT(6), /* inbound window */
63 DBG_EVENT
= BIT(7), /* event handling messages */
64 DBG_OBW
= BIT(8), /* outbound window messages */
65 DBG_DBELL
= BIT(9), /* doorbell messages */
70 #define rmcd_debug(level, fmt, arg...) \
72 if (DBG_##level & dbg_level) \
73 pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
76 #define rmcd_debug(level, fmt, arg...) \
77 no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
80 #define rmcd_warn(fmt, arg...) \
81 pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)
83 #define rmcd_error(fmt, arg...) \
84 pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)
86 MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>");
87 MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>");
88 MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
89 MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>");
90 MODULE_DESCRIPTION("RapidIO mport character device driver");
91 MODULE_LICENSE("GPL");
92 MODULE_VERSION(DRV_VERSION
);
94 static int dma_timeout
= 3000; /* DMA transfer timeout in msec */
95 module_param(dma_timeout
, int, S_IRUGO
);
96 MODULE_PARM_DESC(dma_timeout
, "DMA Transfer Timeout in msec (default: 3000)");
99 static u32 dbg_level
= DBG_NONE
;
100 module_param(dbg_level
, uint
, S_IWUSR
| S_IWGRP
| S_IRUGO
);
101 MODULE_PARM_DESC(dbg_level
, "Debugging output level (default 0 = none)");
105 * An internal DMA coherent buffer
107 struct mport_dma_buf
{
117 * Internal memory mapping structure
119 enum rio_mport_map_dir
{
125 struct rio_mport_mapping
{
126 struct list_head node
;
127 struct mport_dev
*md
;
128 enum rio_mport_map_dir dir
;
131 dma_addr_t phys_addr
; /* for mmap */
132 void *virt_addr
; /* kernel address, for dma_free_coherent */
134 struct kref ref
; /* refcount of vmas sharing the mapping */
138 struct rio_mport_dma_map
{
145 #define MPORT_MAX_DMA_BUFS 16
146 #define MPORT_EVENT_DEPTH 10
149 * mport_dev driver-specific structure that represents mport device
150 * @active mport device status flag
151 * @node list node to maintain list of registered mports
152 * @cdev character device
153 * @dev associated device object
154 * @mport associated subsystem's master port device object
155 * @buf_mutex lock for buffer handling
156 * @file_mutex - lock for open files list
157 * @file_list - list of open files on given mport
158 * @properties properties of this mport
159 * @portwrites queue of inbound portwrites
160 * @pw_lock lock for port write queue
161 * @mappings queue for memory mappings
162 * @dma_chan DMA channels associated with this device
168 struct list_head node
;
171 struct rio_mport
*mport
;
172 struct mutex buf_mutex
;
173 struct mutex file_mutex
;
174 struct list_head file_list
;
175 struct rio_mport_properties properties
;
176 struct list_head doorbells
;
178 struct list_head portwrites
;
180 struct list_head mappings
;
181 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
182 struct dma_chan
*dma_chan
;
184 struct completion comp
;
189 * mport_cdev_priv - data structure specific to individual file object
190 * associated with an open device
191 * @md master port character device object
192 * @async_queue - asynchronous notification queue
193 * @list - file objects tracking list
194 * @db_filters inbound doorbell filters for this descriptor
195 * @pw_filters portwrite filters for this descriptor
196 * @event_fifo event fifo for this descriptor
197 * @event_rx_wait wait queue for this descriptor
198 * @fifo_lock lock for event_fifo
199 * @event_mask event mask for this descriptor
200 * @dmach DMA engine channel allocated for specific file object
202 struct mport_cdev_priv
{
203 struct mport_dev
*md
;
204 struct fasync_struct
*async_queue
;
205 struct list_head list
;
206 struct list_head db_filters
;
207 struct list_head pw_filters
;
208 struct kfifo event_fifo
;
209 wait_queue_head_t event_rx_wait
;
210 spinlock_t fifo_lock
;
211 u32 event_mask
; /* RIO_DOORBELL, RIO_PORTWRITE */
212 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
213 struct dma_chan
*dmach
;
214 struct list_head async_list
;
215 struct list_head pend_list
;
217 struct mutex dma_lock
;
219 struct completion comp
;
224 * rio_mport_pw_filter - structure to describe a portwrite filter
225 * md_node node in mport device's list
226 * priv_node node in private file object's list
227 * priv reference to private data
228 * filter actual portwrite filter
230 struct rio_mport_pw_filter
{
231 struct list_head md_node
;
232 struct list_head priv_node
;
233 struct mport_cdev_priv
*priv
;
234 struct rio_pw_filter filter
;
238 * rio_mport_db_filter - structure to describe a doorbell filter
239 * @data_node reference to device node
240 * @priv_node node in private data
241 * @priv reference to private data
242 * @filter actual doorbell filter
244 struct rio_mport_db_filter
{
245 struct list_head data_node
;
246 struct list_head priv_node
;
247 struct mport_cdev_priv
*priv
;
248 struct rio_doorbell_filter filter
;
251 static LIST_HEAD(mport_devs
);
252 static DEFINE_MUTEX(mport_devs_lock
);
254 #if (0) /* used by commented out portion of poll function : FIXME */
255 static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait
);
258 static struct class *dev_class
;
259 static dev_t dev_number
;
261 static struct workqueue_struct
*dma_wq
;
263 static void mport_release_mapping(struct kref
*ref
);
265 static int rio_mport_maint_rd(struct mport_cdev_priv
*priv
, void __user
*arg
,
268 struct rio_mport
*mport
= priv
->md
->mport
;
269 struct rio_mport_maint_io maint_io
;
275 if (unlikely(copy_from_user(&maint_io
, arg
, sizeof(maint_io
))))
278 if ((maint_io
.offset
% 4) ||
279 (maint_io
.length
== 0) || (maint_io
.length
% 4) ||
280 (maint_io
.length
+ maint_io
.offset
) > RIO_MAINT_SPACE_SZ
)
283 buffer
= vmalloc(maint_io
.length
);
286 length
= maint_io
.length
/sizeof(u32
);
287 offset
= maint_io
.offset
;
289 for (i
= 0; i
< length
; i
++) {
291 ret
= __rio_local_read_config_32(mport
,
294 ret
= rio_mport_read_config_32(mport
, maint_io
.rioid
,
295 maint_io
.hopcount
, offset
, &buffer
[i
]);
302 if (unlikely(copy_to_user((void __user
*)(uintptr_t)maint_io
.buffer
,
303 buffer
, maint_io
.length
)))
310 static int rio_mport_maint_wr(struct mport_cdev_priv
*priv
, void __user
*arg
,
313 struct rio_mport
*mport
= priv
->md
->mport
;
314 struct rio_mport_maint_io maint_io
;
318 int ret
= -EINVAL
, i
;
320 if (unlikely(copy_from_user(&maint_io
, arg
, sizeof(maint_io
))))
323 if ((maint_io
.offset
% 4) ||
324 (maint_io
.length
== 0) || (maint_io
.length
% 4) ||
325 (maint_io
.length
+ maint_io
.offset
) > RIO_MAINT_SPACE_SZ
)
328 buffer
= vmalloc(maint_io
.length
);
331 length
= maint_io
.length
;
333 if (unlikely(copy_from_user(buffer
,
334 (void __user
*)(uintptr_t)maint_io
.buffer
, length
))) {
339 offset
= maint_io
.offset
;
340 length
/= sizeof(u32
);
342 for (i
= 0; i
< length
; i
++) {
344 ret
= __rio_local_write_config_32(mport
,
347 ret
= rio_mport_write_config_32(mport
, maint_io
.rioid
,
363 * Inbound/outbound memory mapping functions
366 rio_mport_create_outbound_mapping(struct mport_dev
*md
, struct file
*filp
,
367 u16 rioid
, u64 raddr
, u32 size
,
370 struct rio_mport
*mport
= md
->mport
;
371 struct rio_mport_mapping
*map
;
374 rmcd_debug(OBW
, "did=%d ra=0x%llx sz=0x%x", rioid
, raddr
, size
);
376 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
380 ret
= rio_map_outb_region(mport
, rioid
, raddr
, size
, 0, paddr
);
384 map
->dir
= MAP_OUTBOUND
;
386 map
->rio_addr
= raddr
;
388 map
->phys_addr
= *paddr
;
391 kref_init(&map
->ref
);
392 list_add_tail(&map
->node
, &md
->mappings
);
400 rio_mport_get_outbound_mapping(struct mport_dev
*md
, struct file
*filp
,
401 u16 rioid
, u64 raddr
, u32 size
,
404 struct rio_mport_mapping
*map
;
407 mutex_lock(&md
->buf_mutex
);
408 list_for_each_entry(map
, &md
->mappings
, node
) {
409 if (map
->dir
!= MAP_OUTBOUND
)
411 if (rioid
== map
->rioid
&&
412 raddr
== map
->rio_addr
&& size
== map
->size
) {
413 *paddr
= map
->phys_addr
;
416 } else if (rioid
== map
->rioid
&&
417 raddr
< (map
->rio_addr
+ map
->size
- 1) &&
418 (raddr
+ size
) > map
->rio_addr
) {
424 /* If not found, create new */
426 err
= rio_mport_create_outbound_mapping(md
, filp
, rioid
, raddr
,
428 mutex_unlock(&md
->buf_mutex
);
432 static int rio_mport_obw_map(struct file
*filp
, void __user
*arg
)
434 struct mport_cdev_priv
*priv
= filp
->private_data
;
435 struct mport_dev
*data
= priv
->md
;
440 if (unlikely(copy_from_user(&map
, arg
, sizeof(map
))))
443 rmcd_debug(OBW
, "did=%d ra=0x%llx sz=0x%llx",
444 map
.rioid
, map
.rio_addr
, map
.length
);
446 ret
= rio_mport_get_outbound_mapping(data
, filp
, map
.rioid
,
447 map
.rio_addr
, map
.length
, &paddr
);
449 rmcd_error("Failed to set OBW err= %d", ret
);
455 if (unlikely(copy_to_user(arg
, &map
, sizeof(map
))))
461 * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
463 * @priv: driver private data
464 * @arg: buffer handle returned by allocation routine
466 static int rio_mport_obw_free(struct file
*filp
, void __user
*arg
)
468 struct mport_cdev_priv
*priv
= filp
->private_data
;
469 struct mport_dev
*md
= priv
->md
;
471 struct rio_mport_mapping
*map
, *_map
;
473 if (!md
->mport
->ops
->unmap_outb
)
474 return -EPROTONOSUPPORT
;
476 if (copy_from_user(&handle
, arg
, sizeof(handle
)))
479 rmcd_debug(OBW
, "h=0x%llx", handle
);
481 mutex_lock(&md
->buf_mutex
);
482 list_for_each_entry_safe(map
, _map
, &md
->mappings
, node
) {
483 if (map
->dir
== MAP_OUTBOUND
&& map
->phys_addr
== handle
) {
484 if (map
->filp
== filp
) {
485 rmcd_debug(OBW
, "kref_put h=0x%llx", handle
);
487 kref_put(&map
->ref
, mport_release_mapping
);
492 mutex_unlock(&md
->buf_mutex
);
498 * maint_hdid_set() - Set the host Device ID
499 * @priv: driver private data
502 static int maint_hdid_set(struct mport_cdev_priv
*priv
, void __user
*arg
)
504 struct mport_dev
*md
= priv
->md
;
507 if (copy_from_user(&hdid
, arg
, sizeof(hdid
)))
510 md
->mport
->host_deviceid
= hdid
;
511 md
->properties
.hdid
= hdid
;
512 rio_local_set_device_id(md
->mport
, hdid
);
514 rmcd_debug(MPORT
, "Set host device Id to %d", hdid
);
520 * maint_comptag_set() - Set the host Component Tag
521 * @priv: driver private data
522 * @arg: Component Tag
524 static int maint_comptag_set(struct mport_cdev_priv
*priv
, void __user
*arg
)
526 struct mport_dev
*md
= priv
->md
;
529 if (copy_from_user(&comptag
, arg
, sizeof(comptag
)))
532 rio_local_write_config_32(md
->mport
, RIO_COMPONENT_TAG_CSR
, comptag
);
534 rmcd_debug(MPORT
, "Set host Component Tag to %d", comptag
);
539 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
541 struct mport_dma_req
{
542 struct list_head node
;
544 struct mport_cdev_priv
*priv
;
545 enum rio_transfer_sync sync
;
547 struct page
**page_list
;
548 unsigned int nr_pages
;
549 struct rio_mport_mapping
*map
;
550 struct dma_chan
*dmach
;
551 enum dma_data_direction dir
;
553 enum dma_status status
;
554 struct completion req_comp
;
557 struct mport_faf_work
{
558 struct work_struct work
;
559 struct mport_dma_req
*req
;
562 static void mport_release_def_dma(struct kref
*dma_ref
)
564 struct mport_dev
*md
=
565 container_of(dma_ref
, struct mport_dev
, dma_ref
);
567 rmcd_debug(EXIT
, "DMA_%d", md
->dma_chan
->chan_id
);
568 rio_release_dma(md
->dma_chan
);
572 static void mport_release_dma(struct kref
*dma_ref
)
574 struct mport_cdev_priv
*priv
=
575 container_of(dma_ref
, struct mport_cdev_priv
, dma_ref
);
577 rmcd_debug(EXIT
, "DMA_%d", priv
->dmach
->chan_id
);
578 complete(&priv
->comp
);
581 static void dma_req_free(struct mport_dma_req
*req
)
583 struct mport_cdev_priv
*priv
= req
->priv
;
586 dma_unmap_sg(req
->dmach
->device
->dev
,
587 req
->sgt
.sgl
, req
->sgt
.nents
, req
->dir
);
588 sg_free_table(&req
->sgt
);
589 if (req
->page_list
) {
590 for (i
= 0; i
< req
->nr_pages
; i
++)
591 put_page(req
->page_list
[i
]);
592 kfree(req
->page_list
);
596 mutex_lock(&req
->map
->md
->buf_mutex
);
597 kref_put(&req
->map
->ref
, mport_release_mapping
);
598 mutex_unlock(&req
->map
->md
->buf_mutex
);
601 kref_put(&priv
->dma_ref
, mport_release_dma
);
606 static void dma_xfer_callback(void *param
)
608 struct mport_dma_req
*req
= (struct mport_dma_req
*)param
;
609 struct mport_cdev_priv
*priv
= req
->priv
;
611 req
->status
= dma_async_is_tx_complete(priv
->dmach
, req
->cookie
,
613 complete(&req
->req_comp
);
616 static void dma_faf_cleanup(struct work_struct
*_work
)
618 struct mport_faf_work
*work
= container_of(_work
,
619 struct mport_faf_work
, work
);
620 struct mport_dma_req
*req
= work
->req
;
626 static void dma_faf_callback(void *param
)
628 struct mport_dma_req
*req
= (struct mport_dma_req
*)param
;
629 struct mport_faf_work
*work
;
631 work
= kmalloc(sizeof(*work
), GFP_ATOMIC
);
635 INIT_WORK(&work
->work
, dma_faf_cleanup
);
637 queue_work(dma_wq
, &work
->work
);
641 * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
643 * Returns pointer to DMA transaction descriptor allocated by DMA driver on
644 * success or ERR_PTR (and/or NULL) if failed. Caller must check returned
645 * non-NULL pointer using IS_ERR macro.
647 static struct dma_async_tx_descriptor
648 *prep_dma_xfer(struct dma_chan
*chan
, struct rio_transfer_io
*transfer
,
649 struct sg_table
*sgt
, int nents
, enum dma_transfer_direction dir
,
650 enum dma_ctrl_flags flags
)
652 struct rio_dma_data tx_data
;
654 tx_data
.sg
= sgt
->sgl
;
655 tx_data
.sg_len
= nents
;
656 tx_data
.rio_addr_u
= 0;
657 tx_data
.rio_addr
= transfer
->rio_addr
;
658 if (dir
== DMA_MEM_TO_DEV
) {
659 switch (transfer
->method
) {
660 case RIO_EXCHANGE_NWRITE
:
661 tx_data
.wr_type
= RDW_ALL_NWRITE
;
663 case RIO_EXCHANGE_NWRITE_R_ALL
:
664 tx_data
.wr_type
= RDW_ALL_NWRITE_R
;
666 case RIO_EXCHANGE_NWRITE_R
:
667 tx_data
.wr_type
= RDW_LAST_NWRITE_R
;
669 case RIO_EXCHANGE_DEFAULT
:
670 tx_data
.wr_type
= RDW_DEFAULT
;
673 return ERR_PTR(-EINVAL
);
677 return rio_dma_prep_xfer(chan
, transfer
->rioid
, &tx_data
, dir
, flags
);
680 /* Request DMA channel associated with this mport device.
681 * Try to request DMA channel for every new process that opened given
682 * mport. If a new DMA channel is not available use default channel
683 * which is the first DMA channel opened on mport device.
685 static int get_dma_channel(struct mport_cdev_priv
*priv
)
687 mutex_lock(&priv
->dma_lock
);
689 priv
->dmach
= rio_request_mport_dma(priv
->md
->mport
);
691 /* Use default DMA channel if available */
692 if (priv
->md
->dma_chan
) {
693 priv
->dmach
= priv
->md
->dma_chan
;
694 kref_get(&priv
->md
->dma_ref
);
696 rmcd_error("Failed to get DMA channel");
697 mutex_unlock(&priv
->dma_lock
);
700 } else if (!priv
->md
->dma_chan
) {
701 /* Register default DMA channel if we do not have one */
702 priv
->md
->dma_chan
= priv
->dmach
;
703 kref_init(&priv
->md
->dma_ref
);
704 rmcd_debug(DMA
, "Register DMA_chan %d as default",
705 priv
->dmach
->chan_id
);
708 kref_init(&priv
->dma_ref
);
709 init_completion(&priv
->comp
);
712 kref_get(&priv
->dma_ref
);
713 mutex_unlock(&priv
->dma_lock
);
717 static void put_dma_channel(struct mport_cdev_priv
*priv
)
719 kref_put(&priv
->dma_ref
, mport_release_dma
);
723 * DMA transfer functions
725 static int do_dma_request(struct mport_dma_req
*req
,
726 struct rio_transfer_io
*xfer
,
727 enum rio_transfer_sync sync
, int nents
)
729 struct mport_cdev_priv
*priv
;
730 struct sg_table
*sgt
;
731 struct dma_chan
*chan
;
732 struct dma_async_tx_descriptor
*tx
;
734 unsigned long tmo
= msecs_to_jiffies(dma_timeout
);
735 enum dma_transfer_direction dir
;
743 dir
= (req
->dir
== DMA_FROM_DEVICE
) ? DMA_DEV_TO_MEM
: DMA_MEM_TO_DEV
;
745 rmcd_debug(DMA
, "%s(%d) uses %s for DMA_%s",
746 current
->comm
, task_pid_nr(current
),
747 dev_name(&chan
->dev
->device
),
748 (dir
== DMA_DEV_TO_MEM
)?"READ":"WRITE");
750 /* Initialize DMA transaction request */
751 tx
= prep_dma_xfer(chan
, xfer
, sgt
, nents
, dir
,
752 DMA_CTRL_ACK
| DMA_PREP_INTERRUPT
);
755 rmcd_debug(DMA
, "prep error for %s A:0x%llx L:0x%llx",
756 (dir
== DMA_DEV_TO_MEM
)?"READ":"WRITE",
757 xfer
->rio_addr
, xfer
->length
);
760 } else if (IS_ERR(tx
)) {
762 rmcd_debug(DMA
, "prep error %d for %s A:0x%llx L:0x%llx", ret
,
763 (dir
== DMA_DEV_TO_MEM
)?"READ":"WRITE",
764 xfer
->rio_addr
, xfer
->length
);
768 if (sync
== RIO_TRANSFER_FAF
)
769 tx
->callback
= dma_faf_callback
;
771 tx
->callback
= dma_xfer_callback
;
772 tx
->callback_param
= req
;
776 req
->status
= DMA_IN_PROGRESS
;
777 init_completion(&req
->req_comp
);
779 cookie
= dmaengine_submit(tx
);
780 req
->cookie
= cookie
;
782 rmcd_debug(DMA
, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current
),
783 (dir
== DMA_DEV_TO_MEM
)?"READ":"WRITE", cookie
);
785 if (dma_submit_error(cookie
)) {
786 rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)",
787 cookie
, xfer
->rio_addr
, xfer
->length
);
792 dma_async_issue_pending(chan
);
794 if (sync
== RIO_TRANSFER_ASYNC
) {
795 spin_lock(&priv
->req_lock
);
796 list_add_tail(&req
->node
, &priv
->async_list
);
797 spin_unlock(&priv
->req_lock
);
799 } else if (sync
== RIO_TRANSFER_FAF
)
802 wret
= wait_for_completion_interruptible_timeout(&req
->req_comp
, tmo
);
805 /* Timeout on wait occurred */
806 rmcd_error("%s(%d) timed out waiting for DMA_%s %d",
807 current
->comm
, task_pid_nr(current
),
808 (dir
== DMA_DEV_TO_MEM
)?"READ":"WRITE", cookie
);
810 } else if (wret
== -ERESTARTSYS
) {
811 /* Wait_for_completion was interrupted by a signal but DMA may
814 rmcd_error("%s(%d) wait for DMA_%s %d was interrupted",
815 current
->comm
, task_pid_nr(current
),
816 (dir
== DMA_DEV_TO_MEM
)?"READ":"WRITE", cookie
);
820 if (req
->status
!= DMA_COMPLETE
) {
821 /* DMA transaction completion was signaled with error */
822 rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)",
823 current
->comm
, task_pid_nr(current
),
824 (dir
== DMA_DEV_TO_MEM
)?"READ":"WRITE",
825 cookie
, req
->status
, ret
);
834 * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from
835 * the remote RapidIO device
836 * @filp: file pointer associated with the call
837 * @transfer_mode: DMA transfer mode
838 * @sync: synchronization mode
839 * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR
840 * DMA_DEV_TO_MEM = read)
841 * @xfer: data transfer descriptor structure
844 rio_dma_transfer(struct file
*filp
, u32 transfer_mode
,
845 enum rio_transfer_sync sync
, enum dma_data_direction dir
,
846 struct rio_transfer_io
*xfer
)
848 struct mport_cdev_priv
*priv
= filp
->private_data
;
849 unsigned long nr_pages
= 0;
850 struct page
**page_list
= NULL
;
851 struct mport_dma_req
*req
;
852 struct mport_dev
*md
= priv
->md
;
853 struct dma_chan
*chan
;
857 if (xfer
->length
== 0)
859 req
= kzalloc(sizeof(*req
), GFP_KERNEL
);
863 ret
= get_dma_channel(priv
);
870 * If parameter loc_addr != NULL, we are transferring data from/to
871 * data buffer allocated in user-space: lock in memory user-space
872 * buffer pages and build an SG table for DMA transfer request
874 * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is
875 * used for DMA data transfers: build single entry SG table using
876 * offset within the internal buffer specified by handle parameter.
878 if (xfer
->loc_addr
) {
882 offset
= lower_32_bits(offset_in_page(xfer
->loc_addr
));
883 nr_pages
= PAGE_ALIGN(xfer
->length
+ offset
) >> PAGE_SHIFT
;
885 page_list
= kmalloc_array(nr_pages
,
886 sizeof(*page_list
), GFP_KERNEL
);
887 if (page_list
== NULL
) {
892 pinned
= get_user_pages_fast(
893 (unsigned long)xfer
->loc_addr
& PAGE_MASK
,
894 nr_pages
, dir
== DMA_FROM_DEVICE
, page_list
);
896 if (pinned
!= nr_pages
) {
898 rmcd_error("get_user_pages_unlocked err=%ld",
902 rmcd_error("pinned %ld out of %ld pages",
908 ret
= sg_alloc_table_from_pages(&req
->sgt
, page_list
, nr_pages
,
909 offset
, xfer
->length
, GFP_KERNEL
);
911 rmcd_error("sg_alloc_table failed with err=%d", ret
);
915 req
->page_list
= page_list
;
916 req
->nr_pages
= nr_pages
;
919 struct rio_mport_mapping
*map
;
921 baddr
= (dma_addr_t
)xfer
->handle
;
923 mutex_lock(&md
->buf_mutex
);
924 list_for_each_entry(map
, &md
->mappings
, node
) {
925 if (baddr
>= map
->phys_addr
&&
926 baddr
< (map
->phys_addr
+ map
->size
)) {
932 mutex_unlock(&md
->buf_mutex
);
934 if (req
->map
== NULL
) {
939 if (xfer
->length
+ xfer
->offset
> map
->size
) {
944 ret
= sg_alloc_table(&req
->sgt
, 1, GFP_KERNEL
);
946 rmcd_error("sg_alloc_table failed for internal buf");
950 sg_set_buf(req
->sgt
.sgl
,
951 map
->virt_addr
+ (baddr
- map
->phys_addr
) +
952 xfer
->offset
, xfer
->length
);
960 nents
= dma_map_sg(chan
->device
->dev
,
961 req
->sgt
.sgl
, req
->sgt
.nents
, dir
);
962 if (nents
== -EFAULT
) {
963 rmcd_error("Failed to map SG list");
967 ret
= do_dma_request(req
, xfer
, sync
, nents
);
970 if (sync
== RIO_TRANSFER_SYNC
)
972 return ret
; /* return ASYNC cookie */
975 if (ret
== -ETIMEDOUT
|| ret
== -EINTR
) {
977 * This can happen only in case of SYNC transfer.
978 * Do not free unfinished request structure immediately.
979 * Place it into pending list and deal with it later
981 spin_lock(&priv
->req_lock
);
982 list_add_tail(&req
->node
, &priv
->pend_list
);
983 spin_unlock(&priv
->req_lock
);
988 rmcd_debug(DMA
, "do_dma_request failed with err=%d", ret
);
990 dma_unmap_sg(chan
->device
->dev
, req
->sgt
.sgl
, req
->sgt
.nents
, dir
);
991 sg_free_table(&req
->sgt
);
994 for (i
= 0; i
< nr_pages
; i
++)
995 put_page(page_list
[i
]);
1000 mutex_lock(&md
->buf_mutex
);
1001 kref_put(&req
->map
->ref
, mport_release_mapping
);
1002 mutex_unlock(&md
->buf_mutex
);
1004 put_dma_channel(priv
);
1009 static int rio_mport_transfer_ioctl(struct file
*filp
, void __user
*arg
)
1011 struct mport_cdev_priv
*priv
= filp
->private_data
;
1012 struct rio_transaction transaction
;
1013 struct rio_transfer_io
*transfer
;
1014 enum dma_data_direction dir
;
1017 if (unlikely(copy_from_user(&transaction
, arg
, sizeof(transaction
))))
1020 if (transaction
.count
!= 1) /* only single transfer for now */
1023 if ((transaction
.transfer_mode
&
1024 priv
->md
->properties
.transfer_mode
) == 0)
1027 transfer
= vmalloc(transaction
.count
* sizeof(*transfer
));
1031 if (unlikely(copy_from_user(transfer
,
1032 (void __user
*)(uintptr_t)transaction
.block
,
1033 transaction
.count
* sizeof(*transfer
)))) {
1038 dir
= (transaction
.dir
== RIO_TRANSFER_DIR_READ
) ?
1039 DMA_FROM_DEVICE
: DMA_TO_DEVICE
;
1040 for (i
= 0; i
< transaction
.count
&& ret
== 0; i
++)
1041 ret
= rio_dma_transfer(filp
, transaction
.transfer_mode
,
1042 transaction
.sync
, dir
, &transfer
[i
]);
1044 if (unlikely(copy_to_user((void __user
*)(uintptr_t)transaction
.block
,
1046 transaction
.count
* sizeof(*transfer
))))
1055 static int rio_mport_wait_for_async_dma(struct file
*filp
, void __user
*arg
)
1057 struct mport_cdev_priv
*priv
;
1058 struct mport_dev
*md
;
1059 struct rio_async_tx_wait w_param
;
1060 struct mport_dma_req
*req
;
1061 dma_cookie_t cookie
;
1067 priv
= (struct mport_cdev_priv
*)filp
->private_data
;
1070 if (unlikely(copy_from_user(&w_param
, arg
, sizeof(w_param
))))
1073 cookie
= w_param
.token
;
1074 if (w_param
.timeout
)
1075 tmo
= msecs_to_jiffies(w_param
.timeout
);
1076 else /* Use default DMA timeout */
1077 tmo
= msecs_to_jiffies(dma_timeout
);
1079 spin_lock(&priv
->req_lock
);
1080 list_for_each_entry(req
, &priv
->async_list
, node
) {
1081 if (req
->cookie
== cookie
) {
1082 list_del(&req
->node
);
1087 spin_unlock(&priv
->req_lock
);
1092 wret
= wait_for_completion_interruptible_timeout(&req
->req_comp
, tmo
);
1095 /* Timeout on wait occurred */
1096 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1097 current
->comm
, task_pid_nr(current
),
1098 (req
->dir
== DMA_FROM_DEVICE
)?"READ":"WRITE");
1101 } else if (wret
== -ERESTARTSYS
) {
1102 /* Wait_for_completion was interrupted by a signal but DMA may
1103 * be still in progress
1105 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1106 current
->comm
, task_pid_nr(current
),
1107 (req
->dir
== DMA_FROM_DEVICE
)?"READ":"WRITE");
1112 if (req
->status
!= DMA_COMPLETE
) {
1113 /* DMA transaction completion signaled with transfer error */
1114 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1115 current
->comm
, task_pid_nr(current
),
1116 (req
->dir
== DMA_FROM_DEVICE
)?"READ":"WRITE",
1122 if (req
->status
!= DMA_IN_PROGRESS
&& req
->status
!= DMA_PAUSED
)
1128 /* Return request back into async queue */
1129 spin_lock(&priv
->req_lock
);
1130 list_add_tail(&req
->node
, &priv
->async_list
);
1131 spin_unlock(&priv
->req_lock
);
1135 static int rio_mport_create_dma_mapping(struct mport_dev
*md
, struct file
*filp
,
1136 u64 size
, struct rio_mport_mapping
**mapping
)
1138 struct rio_mport_mapping
*map
;
1140 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
1144 map
->virt_addr
= dma_alloc_coherent(md
->mport
->dev
.parent
, size
,
1145 &map
->phys_addr
, GFP_KERNEL
);
1146 if (map
->virt_addr
== NULL
) {
1155 kref_init(&map
->ref
);
1156 mutex_lock(&md
->buf_mutex
);
1157 list_add_tail(&map
->node
, &md
->mappings
);
1158 mutex_unlock(&md
->buf_mutex
);
1164 static int rio_mport_alloc_dma(struct file
*filp
, void __user
*arg
)
1166 struct mport_cdev_priv
*priv
= filp
->private_data
;
1167 struct mport_dev
*md
= priv
->md
;
1168 struct rio_dma_mem map
;
1169 struct rio_mport_mapping
*mapping
= NULL
;
1172 if (unlikely(copy_from_user(&map
, arg
, sizeof(map
))))
1175 ret
= rio_mport_create_dma_mapping(md
, filp
, map
.length
, &mapping
);
1179 map
.dma_handle
= mapping
->phys_addr
;
1181 if (unlikely(copy_to_user(arg
, &map
, sizeof(map
)))) {
1182 mutex_lock(&md
->buf_mutex
);
1183 kref_put(&mapping
->ref
, mport_release_mapping
);
1184 mutex_unlock(&md
->buf_mutex
);
1191 static int rio_mport_free_dma(struct file
*filp
, void __user
*arg
)
1193 struct mport_cdev_priv
*priv
= filp
->private_data
;
1194 struct mport_dev
*md
= priv
->md
;
1197 struct rio_mport_mapping
*map
, *_map
;
1199 if (copy_from_user(&handle
, arg
, sizeof(handle
)))
1201 rmcd_debug(EXIT
, "filp=%p", filp
);
1203 mutex_lock(&md
->buf_mutex
);
1204 list_for_each_entry_safe(map
, _map
, &md
->mappings
, node
) {
1205 if (map
->dir
== MAP_DMA
&& map
->phys_addr
== handle
&&
1206 map
->filp
== filp
) {
1207 kref_put(&map
->ref
, mport_release_mapping
);
1212 mutex_unlock(&md
->buf_mutex
);
1214 if (ret
== -EFAULT
) {
1215 rmcd_debug(DMA
, "ERR no matching mapping");
1222 static int rio_mport_transfer_ioctl(struct file
*filp
, void *arg
)
1227 static int rio_mport_wait_for_async_dma(struct file
*filp
, void __user
*arg
)
1232 static int rio_mport_alloc_dma(struct file
*filp
, void __user
*arg
)
1237 static int rio_mport_free_dma(struct file
*filp
, void __user
*arg
)
1241 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1244 * Inbound/outbound memory mapping functions
1248 rio_mport_create_inbound_mapping(struct mport_dev
*md
, struct file
*filp
,
1249 u64 raddr
, u64 size
,
1250 struct rio_mport_mapping
**mapping
)
1252 struct rio_mport
*mport
= md
->mport
;
1253 struct rio_mport_mapping
*map
;
1256 /* rio_map_inb_region() accepts u32 size */
1257 if (size
> 0xffffffff)
1260 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
1264 map
->virt_addr
= dma_alloc_coherent(mport
->dev
.parent
, size
,
1265 &map
->phys_addr
, GFP_KERNEL
);
1266 if (map
->virt_addr
== NULL
) {
1271 if (raddr
== RIO_MAP_ANY_ADDR
)
1272 raddr
= map
->phys_addr
;
1273 ret
= rio_map_inb_region(mport
, map
->phys_addr
, raddr
, (u32
)size
, 0);
1277 map
->dir
= MAP_INBOUND
;
1278 map
->rio_addr
= raddr
;
1282 kref_init(&map
->ref
);
1283 mutex_lock(&md
->buf_mutex
);
1284 list_add_tail(&map
->node
, &md
->mappings
);
1285 mutex_unlock(&md
->buf_mutex
);
1290 dma_free_coherent(mport
->dev
.parent
, size
,
1291 map
->virt_addr
, map
->phys_addr
);
1298 rio_mport_get_inbound_mapping(struct mport_dev
*md
, struct file
*filp
,
1299 u64 raddr
, u64 size
,
1300 struct rio_mport_mapping
**mapping
)
1302 struct rio_mport_mapping
*map
;
1305 if (raddr
== RIO_MAP_ANY_ADDR
)
1308 mutex_lock(&md
->buf_mutex
);
1309 list_for_each_entry(map
, &md
->mappings
, node
) {
1310 if (map
->dir
!= MAP_INBOUND
)
1312 if (raddr
== map
->rio_addr
&& size
== map
->size
) {
1313 /* allow exact match only */
1317 } else if (raddr
< (map
->rio_addr
+ map
->size
- 1) &&
1318 (raddr
+ size
) > map
->rio_addr
) {
1323 mutex_unlock(&md
->buf_mutex
);
1328 /* not found, create new */
1329 return rio_mport_create_inbound_mapping(md
, filp
, raddr
, size
, mapping
);
1332 static int rio_mport_map_inbound(struct file
*filp
, void __user
*arg
)
1334 struct mport_cdev_priv
*priv
= filp
->private_data
;
1335 struct mport_dev
*md
= priv
->md
;
1336 struct rio_mmap map
;
1337 struct rio_mport_mapping
*mapping
= NULL
;
1340 if (!md
->mport
->ops
->map_inb
)
1341 return -EPROTONOSUPPORT
;
1342 if (unlikely(copy_from_user(&map
, arg
, sizeof(map
))))
1345 rmcd_debug(IBW
, "%s filp=%p", dev_name(&priv
->md
->dev
), filp
);
1347 ret
= rio_mport_get_inbound_mapping(md
, filp
, map
.rio_addr
,
1348 map
.length
, &mapping
);
1352 map
.handle
= mapping
->phys_addr
;
1353 map
.rio_addr
= mapping
->rio_addr
;
1355 if (unlikely(copy_to_user(arg
, &map
, sizeof(map
)))) {
1356 /* Delete mapping if it was created by this request */
1357 if (ret
== 0 && mapping
->filp
== filp
) {
1358 mutex_lock(&md
->buf_mutex
);
1359 kref_put(&mapping
->ref
, mport_release_mapping
);
1360 mutex_unlock(&md
->buf_mutex
);
1369 * rio_mport_inbound_free() - unmap from RapidIO address space and free
1370 * previously allocated inbound DMA coherent buffer
1371 * @priv: driver private data
1372 * @arg: buffer handle returned by allocation routine
1374 static int rio_mport_inbound_free(struct file
*filp
, void __user
*arg
)
1376 struct mport_cdev_priv
*priv
= filp
->private_data
;
1377 struct mport_dev
*md
= priv
->md
;
1379 struct rio_mport_mapping
*map
, *_map
;
1381 rmcd_debug(IBW
, "%s filp=%p", dev_name(&priv
->md
->dev
), filp
);
1383 if (!md
->mport
->ops
->unmap_inb
)
1384 return -EPROTONOSUPPORT
;
1386 if (copy_from_user(&handle
, arg
, sizeof(handle
)))
1389 mutex_lock(&md
->buf_mutex
);
1390 list_for_each_entry_safe(map
, _map
, &md
->mappings
, node
) {
1391 if (map
->dir
== MAP_INBOUND
&& map
->phys_addr
== handle
) {
1392 if (map
->filp
== filp
) {
1394 kref_put(&map
->ref
, mport_release_mapping
);
1399 mutex_unlock(&md
->buf_mutex
);
1405 * maint_port_idx_get() - Get the port index of the mport instance
1406 * @priv: driver private data
1409 static int maint_port_idx_get(struct mport_cdev_priv
*priv
, void __user
*arg
)
1411 struct mport_dev
*md
= priv
->md
;
1412 u32 port_idx
= md
->mport
->index
;
1414 rmcd_debug(MPORT
, "port_index=%d", port_idx
);
1416 if (copy_to_user(arg
, &port_idx
, sizeof(port_idx
)))
1422 static int rio_mport_add_event(struct mport_cdev_priv
*priv
,
1423 struct rio_event
*event
)
1427 if (!(priv
->event_mask
& event
->header
))
1430 spin_lock(&priv
->fifo_lock
);
1431 overflow
= kfifo_avail(&priv
->event_fifo
) < sizeof(*event
)
1432 || kfifo_in(&priv
->event_fifo
, (unsigned char *)event
,
1433 sizeof(*event
)) != sizeof(*event
);
1434 spin_unlock(&priv
->fifo_lock
);
1436 wake_up_interruptible(&priv
->event_rx_wait
);
1439 dev_warn(&priv
->md
->dev
, DRV_NAME
": event fifo overflow\n");
1446 static void rio_mport_doorbell_handler(struct rio_mport
*mport
, void *dev_id
,
1447 u16 src
, u16 dst
, u16 info
)
1449 struct mport_dev
*data
= dev_id
;
1450 struct mport_cdev_priv
*priv
;
1451 struct rio_mport_db_filter
*db_filter
;
1452 struct rio_event event
;
1455 event
.header
= RIO_DOORBELL
;
1456 event
.u
.doorbell
.rioid
= src
;
1457 event
.u
.doorbell
.payload
= info
;
1460 spin_lock(&data
->db_lock
);
1461 list_for_each_entry(db_filter
, &data
->doorbells
, data_node
) {
1462 if (((db_filter
->filter
.rioid
== RIO_INVALID_DESTID
||
1463 db_filter
->filter
.rioid
== src
)) &&
1464 info
>= db_filter
->filter
.low
&&
1465 info
<= db_filter
->filter
.high
) {
1466 priv
= db_filter
->priv
;
1467 rio_mport_add_event(priv
, &event
);
1471 spin_unlock(&data
->db_lock
);
1474 dev_warn(&data
->dev
,
1475 "%s: spurious DB received from 0x%x, info=0x%04x\n",
1476 __func__
, src
, info
);
1479 static int rio_mport_add_db_filter(struct mport_cdev_priv
*priv
,
1482 struct mport_dev
*md
= priv
->md
;
1483 struct rio_mport_db_filter
*db_filter
;
1484 struct rio_doorbell_filter filter
;
1485 unsigned long flags
;
1488 if (copy_from_user(&filter
, arg
, sizeof(filter
)))
1491 if (filter
.low
> filter
.high
)
1494 ret
= rio_request_inb_dbell(md
->mport
, md
, filter
.low
, filter
.high
,
1495 rio_mport_doorbell_handler
);
1497 rmcd_error("%s failed to register IBDB, err=%d",
1498 dev_name(&md
->dev
), ret
);
1502 db_filter
= kzalloc(sizeof(*db_filter
), GFP_KERNEL
);
1503 if (db_filter
== NULL
) {
1504 rio_release_inb_dbell(md
->mport
, filter
.low
, filter
.high
);
1508 db_filter
->filter
= filter
;
1509 db_filter
->priv
= priv
;
1510 spin_lock_irqsave(&md
->db_lock
, flags
);
1511 list_add_tail(&db_filter
->priv_node
, &priv
->db_filters
);
1512 list_add_tail(&db_filter
->data_node
, &md
->doorbells
);
1513 spin_unlock_irqrestore(&md
->db_lock
, flags
);
1518 static void rio_mport_delete_db_filter(struct rio_mport_db_filter
*db_filter
)
1520 list_del(&db_filter
->data_node
);
1521 list_del(&db_filter
->priv_node
);
1525 static int rio_mport_remove_db_filter(struct mport_cdev_priv
*priv
,
1528 struct rio_mport_db_filter
*db_filter
;
1529 struct rio_doorbell_filter filter
;
1530 unsigned long flags
;
1533 if (copy_from_user(&filter
, arg
, sizeof(filter
)))
1536 if (filter
.low
> filter
.high
)
1539 spin_lock_irqsave(&priv
->md
->db_lock
, flags
);
1540 list_for_each_entry(db_filter
, &priv
->db_filters
, priv_node
) {
1541 if (db_filter
->filter
.rioid
== filter
.rioid
&&
1542 db_filter
->filter
.low
== filter
.low
&&
1543 db_filter
->filter
.high
== filter
.high
) {
1544 rio_mport_delete_db_filter(db_filter
);
1549 spin_unlock_irqrestore(&priv
->md
->db_lock
, flags
);
1552 rio_release_inb_dbell(priv
->md
->mport
, filter
.low
, filter
.high
);
1557 static int rio_mport_match_pw(union rio_pw_msg
*msg
,
1558 struct rio_pw_filter
*filter
)
1560 if ((msg
->em
.comptag
& filter
->mask
) < filter
->low
||
1561 (msg
->em
.comptag
& filter
->mask
) > filter
->high
)
1566 static int rio_mport_pw_handler(struct rio_mport
*mport
, void *context
,
1567 union rio_pw_msg
*msg
, int step
)
1569 struct mport_dev
*md
= context
;
1570 struct mport_cdev_priv
*priv
;
1571 struct rio_mport_pw_filter
*pw_filter
;
1572 struct rio_event event
;
1575 event
.header
= RIO_PORTWRITE
;
1576 memcpy(event
.u
.portwrite
.payload
, msg
->raw
, RIO_PW_MSG_SIZE
);
1579 spin_lock(&md
->pw_lock
);
1580 list_for_each_entry(pw_filter
, &md
->portwrites
, md_node
) {
1581 if (rio_mport_match_pw(msg
, &pw_filter
->filter
)) {
1582 priv
= pw_filter
->priv
;
1583 rio_mport_add_event(priv
, &event
);
1587 spin_unlock(&md
->pw_lock
);
1590 printk_ratelimited(KERN_WARNING DRV_NAME
1591 ": mport%d received spurious PW from 0x%08x\n",
1592 mport
->id
, msg
->em
.comptag
);
1598 static int rio_mport_add_pw_filter(struct mport_cdev_priv
*priv
,
1601 struct mport_dev
*md
= priv
->md
;
1602 struct rio_mport_pw_filter
*pw_filter
;
1603 struct rio_pw_filter filter
;
1604 unsigned long flags
;
1607 if (copy_from_user(&filter
, arg
, sizeof(filter
)))
1610 pw_filter
= kzalloc(sizeof(*pw_filter
), GFP_KERNEL
);
1611 if (pw_filter
== NULL
)
1614 pw_filter
->filter
= filter
;
1615 pw_filter
->priv
= priv
;
1616 spin_lock_irqsave(&md
->pw_lock
, flags
);
1617 if (list_empty(&md
->portwrites
))
1619 list_add_tail(&pw_filter
->priv_node
, &priv
->pw_filters
);
1620 list_add_tail(&pw_filter
->md_node
, &md
->portwrites
);
1621 spin_unlock_irqrestore(&md
->pw_lock
, flags
);
1626 ret
= rio_add_mport_pw_handler(md
->mport
, md
,
1627 rio_mport_pw_handler
);
1630 "%s: failed to add IB_PW handler, err=%d\n",
1634 rio_pw_enable(md
->mport
, 1);
1640 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter
*pw_filter
)
1642 list_del(&pw_filter
->md_node
);
1643 list_del(&pw_filter
->priv_node
);
1647 static int rio_mport_match_pw_filter(struct rio_pw_filter
*a
,
1648 struct rio_pw_filter
*b
)
1650 if ((a
->mask
== b
->mask
) && (a
->low
== b
->low
) && (a
->high
== b
->high
))
1655 static int rio_mport_remove_pw_filter(struct mport_cdev_priv
*priv
,
1658 struct mport_dev
*md
= priv
->md
;
1659 struct rio_mport_pw_filter
*pw_filter
;
1660 struct rio_pw_filter filter
;
1661 unsigned long flags
;
1665 if (copy_from_user(&filter
, arg
, sizeof(filter
)))
1668 spin_lock_irqsave(&md
->pw_lock
, flags
);
1669 list_for_each_entry(pw_filter
, &priv
->pw_filters
, priv_node
) {
1670 if (rio_mport_match_pw_filter(&pw_filter
->filter
, &filter
)) {
1671 rio_mport_delete_pw_filter(pw_filter
);
1677 if (list_empty(&md
->portwrites
))
1679 spin_unlock_irqrestore(&md
->pw_lock
, flags
);
1682 rio_del_mport_pw_handler(md
->mport
, priv
->md
,
1683 rio_mport_pw_handler
);
1684 rio_pw_enable(md
->mport
, 0);
1691 * rio_release_dev - release routine for kernel RIO device object
1692 * @dev: kernel device object associated with a RIO device structure
1694 * Frees a RIO device struct associated a RIO device struct.
1695 * The RIO device struct is freed.
1697 static void rio_release_dev(struct device
*dev
)
1699 struct rio_dev
*rdev
;
1701 rdev
= to_rio_dev(dev
);
1702 pr_info(DRV_PREFIX
"%s: %s\n", __func__
, rio_name(rdev
));
1707 static void rio_release_net(struct device
*dev
)
1709 struct rio_net
*net
;
1711 net
= to_rio_net(dev
);
1712 rmcd_debug(RDEV
, "net_%d", net
->id
);
1718 * rio_mport_add_riodev - creates a kernel RIO device object
1720 * Allocates a RIO device data structure and initializes required fields based
1721 * on device's configuration space contents.
1722 * If the device has switch capabilities, then a switch specific portion is
1723 * allocated and configured.
1725 static int rio_mport_add_riodev(struct mport_cdev_priv
*priv
,
1728 struct mport_dev
*md
= priv
->md
;
1729 struct rio_rdev_info dev_info
;
1730 struct rio_dev
*rdev
;
1731 struct rio_switch
*rswitch
= NULL
;
1732 struct rio_mport
*mport
;
1740 if (copy_from_user(&dev_info
, arg
, sizeof(dev_info
)))
1743 rmcd_debug(RDEV
, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info
.name
,
1744 dev_info
.comptag
, dev_info
.destid
, dev_info
.hopcount
);
1746 if (bus_find_device_by_name(&rio_bus_type
, NULL
, dev_info
.name
)) {
1747 rmcd_debug(RDEV
, "device %s already exists", dev_info
.name
);
1751 size
= sizeof(*rdev
);
1753 destid
= dev_info
.destid
;
1754 hopcount
= dev_info
.hopcount
;
1756 if (rio_mport_read_config_32(mport
, destid
, hopcount
,
1757 RIO_PEF_CAR
, &rval
))
1760 if (rval
& RIO_PEF_SWITCH
) {
1761 rio_mport_read_config_32(mport
, destid
, hopcount
,
1762 RIO_SWP_INFO_CAR
, &swpinfo
);
1763 size
+= (RIO_GET_TOTAL_PORTS(swpinfo
) *
1764 sizeof(rswitch
->nextdev
[0])) + sizeof(*rswitch
);
1767 rdev
= kzalloc(size
, GFP_KERNEL
);
1771 if (mport
->net
== NULL
) {
1772 struct rio_net
*net
;
1774 net
= rio_alloc_net(mport
);
1777 rmcd_debug(RDEV
, "failed to allocate net object");
1781 net
->id
= mport
->id
;
1783 dev_set_name(&net
->dev
, "rnet_%d", net
->id
);
1784 net
->dev
.parent
= &mport
->dev
;
1785 net
->dev
.release
= rio_release_net
;
1786 err
= rio_add_net(net
);
1788 rmcd_debug(RDEV
, "failed to register net, err=%d", err
);
1794 rdev
->net
= mport
->net
;
1796 rdev
->swpinfo
= swpinfo
;
1797 rio_mport_read_config_32(mport
, destid
, hopcount
,
1798 RIO_DEV_ID_CAR
, &rval
);
1799 rdev
->did
= rval
>> 16;
1800 rdev
->vid
= rval
& 0xffff;
1801 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_DEV_INFO_CAR
,
1803 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_ASM_ID_CAR
,
1805 rdev
->asm_did
= rval
>> 16;
1806 rdev
->asm_vid
= rval
& 0xffff;
1807 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_ASM_INFO_CAR
,
1809 rdev
->asm_rev
= rval
>> 16;
1811 if (rdev
->pef
& RIO_PEF_EXT_FEATURES
) {
1812 rdev
->efptr
= rval
& 0xffff;
1813 rdev
->phys_efptr
= rio_mport_get_physefb(mport
, 0, destid
,
1814 hopcount
, &rdev
->phys_rmap
);
1816 rdev
->em_efptr
= rio_mport_get_feature(mport
, 0, destid
,
1817 hopcount
, RIO_EFB_ERR_MGMNT
);
1820 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_SRC_OPS_CAR
,
1822 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_DST_OPS_CAR
,
1825 rdev
->comp_tag
= dev_info
.comptag
;
1826 rdev
->destid
= destid
;
1827 /* hopcount is stored as specified by a caller, regardles of EP or SW */
1828 rdev
->hopcount
= hopcount
;
1830 if (rdev
->pef
& RIO_PEF_SWITCH
) {
1831 rswitch
= rdev
->rswitch
;
1832 rswitch
->route_table
= NULL
;
1835 if (strlen(dev_info
.name
))
1836 dev_set_name(&rdev
->dev
, "%s", dev_info
.name
);
1837 else if (rdev
->pef
& RIO_PEF_SWITCH
)
1838 dev_set_name(&rdev
->dev
, "%02x:s:%04x", mport
->id
,
1839 rdev
->comp_tag
& RIO_CTAG_UDEVID
);
1841 dev_set_name(&rdev
->dev
, "%02x:e:%04x", mport
->id
,
1842 rdev
->comp_tag
& RIO_CTAG_UDEVID
);
1844 INIT_LIST_HEAD(&rdev
->net_list
);
1845 rdev
->dev
.parent
= &mport
->net
->dev
;
1846 rio_attach_device(rdev
);
1847 rdev
->dev
.release
= rio_release_dev
;
1849 if (rdev
->dst_ops
& RIO_DST_OPS_DOORBELL
)
1850 rio_init_dbell_res(&rdev
->riores
[RIO_DOORBELL_RESOURCE
],
1852 err
= rio_add_device(rdev
);
1863 static int rio_mport_del_riodev(struct mport_cdev_priv
*priv
, void __user
*arg
)
1865 struct rio_rdev_info dev_info
;
1866 struct rio_dev
*rdev
= NULL
;
1868 struct rio_mport
*mport
;
1869 struct rio_net
*net
;
1871 if (copy_from_user(&dev_info
, arg
, sizeof(dev_info
)))
1874 mport
= priv
->md
->mport
;
1876 /* If device name is specified, removal by name has priority */
1877 if (strlen(dev_info
.name
)) {
1878 dev
= bus_find_device_by_name(&rio_bus_type
, NULL
,
1881 rdev
= to_rio_dev(dev
);
1884 rdev
= rio_get_comptag(dev_info
.comptag
, rdev
);
1885 if (rdev
&& rdev
->dev
.parent
== &mport
->net
->dev
&&
1886 rdev
->destid
== dev_info
.destid
&&
1887 rdev
->hopcount
== dev_info
.hopcount
)
1894 "device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1895 dev_info
.name
, dev_info
.comptag
, dev_info
.destid
,
1902 rio_del_device(rdev
, RIO_DEVICE_SHUTDOWN
);
1904 if (list_empty(&net
->devices
)) {
1913 * Mport cdev management
1917 * mport_cdev_open() - Open character device (mport)
1919 static int mport_cdev_open(struct inode
*inode
, struct file
*filp
)
1922 int minor
= iminor(inode
);
1923 struct mport_dev
*chdev
;
1924 struct mport_cdev_priv
*priv
;
1926 /* Test for valid device */
1927 if (minor
>= RIO_MAX_MPORTS
) {
1928 rmcd_error("Invalid minor device number");
1932 chdev
= container_of(inode
->i_cdev
, struct mport_dev
, cdev
);
1934 rmcd_debug(INIT
, "%s filp=%p", dev_name(&chdev
->dev
), filp
);
1936 if (atomic_read(&chdev
->active
) == 0)
1939 get_device(&chdev
->dev
);
1941 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1943 put_device(&chdev
->dev
);
1949 mutex_lock(&chdev
->file_mutex
);
1950 list_add_tail(&priv
->list
, &chdev
->file_list
);
1951 mutex_unlock(&chdev
->file_mutex
);
1953 INIT_LIST_HEAD(&priv
->db_filters
);
1954 INIT_LIST_HEAD(&priv
->pw_filters
);
1955 spin_lock_init(&priv
->fifo_lock
);
1956 init_waitqueue_head(&priv
->event_rx_wait
);
1957 ret
= kfifo_alloc(&priv
->event_fifo
,
1958 sizeof(struct rio_event
) * MPORT_EVENT_DEPTH
,
1961 dev_err(&chdev
->dev
, DRV_NAME
": kfifo_alloc failed\n");
1966 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1967 INIT_LIST_HEAD(&priv
->async_list
);
1968 INIT_LIST_HEAD(&priv
->pend_list
);
1969 spin_lock_init(&priv
->req_lock
);
1970 mutex_init(&priv
->dma_lock
);
1973 filp
->private_data
= priv
;
1981 static int mport_cdev_fasync(int fd
, struct file
*filp
, int mode
)
1983 struct mport_cdev_priv
*priv
= filp
->private_data
;
1985 return fasync_helper(fd
, filp
, mode
, &priv
->async_queue
);
1988 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1989 static void mport_cdev_release_dma(struct file
*filp
)
1991 struct mport_cdev_priv
*priv
= filp
->private_data
;
1992 struct mport_dev
*md
;
1993 struct mport_dma_req
*req
, *req_next
;
1994 unsigned long tmo
= msecs_to_jiffies(dma_timeout
);
1998 rmcd_debug(EXIT
, "from filp=%p %s(%d)",
1999 filp
, current
->comm
, task_pid_nr(current
));
2002 rmcd_debug(EXIT
, "No DMA channel for filp=%p", filp
);
2008 flush_workqueue(dma_wq
);
2010 spin_lock(&priv
->req_lock
);
2011 if (!list_empty(&priv
->async_list
)) {
2012 rmcd_debug(EXIT
, "async list not empty filp=%p %s(%d)",
2013 filp
, current
->comm
, task_pid_nr(current
));
2014 list_splice_init(&priv
->async_list
, &list
);
2016 spin_unlock(&priv
->req_lock
);
2018 if (!list_empty(&list
)) {
2019 rmcd_debug(EXIT
, "temp list not empty");
2020 list_for_each_entry_safe(req
, req_next
, &list
, node
) {
2021 rmcd_debug(EXIT
, "free req->filp=%p cookie=%d compl=%s",
2022 req
->filp
, req
->cookie
,
2023 completion_done(&req
->req_comp
)?"yes":"no");
2024 list_del(&req
->node
);
2029 if (!list_empty(&priv
->pend_list
)) {
2030 rmcd_debug(EXIT
, "Free pending DMA requests for filp=%p %s(%d)",
2031 filp
, current
->comm
, task_pid_nr(current
));
2032 list_for_each_entry_safe(req
,
2033 req_next
, &priv
->pend_list
, node
) {
2034 rmcd_debug(EXIT
, "free req->filp=%p cookie=%d compl=%s",
2035 req
->filp
, req
->cookie
,
2036 completion_done(&req
->req_comp
)?"yes":"no");
2037 list_del(&req
->node
);
2042 put_dma_channel(priv
);
2043 wret
= wait_for_completion_interruptible_timeout(&priv
->comp
, tmo
);
2046 rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
2047 current
->comm
, task_pid_nr(current
), wret
);
2050 spin_lock(&priv
->req_lock
);
2052 if (!list_empty(&priv
->pend_list
)) {
2053 rmcd_debug(EXIT
, "ATTN: pending DMA requests, filp=%p %s(%d)",
2054 filp
, current
->comm
, task_pid_nr(current
));
2057 spin_unlock(&priv
->req_lock
);
2059 if (priv
->dmach
!= priv
->md
->dma_chan
) {
2060 rmcd_debug(EXIT
, "Release DMA channel for filp=%p %s(%d)",
2061 filp
, current
->comm
, task_pid_nr(current
));
2062 rio_release_dma(priv
->dmach
);
2064 rmcd_debug(EXIT
, "Adjust default DMA channel refcount");
2065 kref_put(&md
->dma_ref
, mport_release_def_dma
);
2071 #define mport_cdev_release_dma(priv) do {} while (0)
2075 * mport_cdev_release() - Release character device
2077 static int mport_cdev_release(struct inode
*inode
, struct file
*filp
)
2079 struct mport_cdev_priv
*priv
= filp
->private_data
;
2080 struct mport_dev
*chdev
;
2081 struct rio_mport_pw_filter
*pw_filter
, *pw_filter_next
;
2082 struct rio_mport_db_filter
*db_filter
, *db_filter_next
;
2083 struct rio_mport_mapping
*map
, *_map
;
2084 unsigned long flags
;
2086 rmcd_debug(EXIT
, "%s filp=%p", dev_name(&priv
->md
->dev
), filp
);
2089 mport_cdev_release_dma(filp
);
2091 priv
->event_mask
= 0;
2093 spin_lock_irqsave(&chdev
->pw_lock
, flags
);
2094 if (!list_empty(&priv
->pw_filters
)) {
2095 list_for_each_entry_safe(pw_filter
, pw_filter_next
,
2096 &priv
->pw_filters
, priv_node
)
2097 rio_mport_delete_pw_filter(pw_filter
);
2099 spin_unlock_irqrestore(&chdev
->pw_lock
, flags
);
2101 spin_lock_irqsave(&chdev
->db_lock
, flags
);
2102 list_for_each_entry_safe(db_filter
, db_filter_next
,
2103 &priv
->db_filters
, priv_node
) {
2104 rio_mport_delete_db_filter(db_filter
);
2106 spin_unlock_irqrestore(&chdev
->db_lock
, flags
);
2108 kfifo_free(&priv
->event_fifo
);
2110 mutex_lock(&chdev
->buf_mutex
);
2111 list_for_each_entry_safe(map
, _map
, &chdev
->mappings
, node
) {
2112 if (map
->filp
== filp
) {
2113 rmcd_debug(EXIT
, "release mapping %p filp=%p",
2114 map
->virt_addr
, filp
);
2115 kref_put(&map
->ref
, mport_release_mapping
);
2118 mutex_unlock(&chdev
->buf_mutex
);
2120 mport_cdev_fasync(-1, filp
, 0);
2121 filp
->private_data
= NULL
;
2122 mutex_lock(&chdev
->file_mutex
);
2123 list_del(&priv
->list
);
2124 mutex_unlock(&chdev
->file_mutex
);
2125 put_device(&chdev
->dev
);
2131 * mport_cdev_ioctl() - IOCTLs for character device
2133 static long mport_cdev_ioctl(struct file
*filp
,
2134 unsigned int cmd
, unsigned long arg
)
2137 struct mport_cdev_priv
*data
= filp
->private_data
;
2138 struct mport_dev
*md
= data
->md
;
2140 if (atomic_read(&md
->active
) == 0)
2144 case RIO_MPORT_MAINT_READ_LOCAL
:
2145 return rio_mport_maint_rd(data
, (void __user
*)arg
, 1);
2146 case RIO_MPORT_MAINT_WRITE_LOCAL
:
2147 return rio_mport_maint_wr(data
, (void __user
*)arg
, 1);
2148 case RIO_MPORT_MAINT_READ_REMOTE
:
2149 return rio_mport_maint_rd(data
, (void __user
*)arg
, 0);
2150 case RIO_MPORT_MAINT_WRITE_REMOTE
:
2151 return rio_mport_maint_wr(data
, (void __user
*)arg
, 0);
2152 case RIO_MPORT_MAINT_HDID_SET
:
2153 return maint_hdid_set(data
, (void __user
*)arg
);
2154 case RIO_MPORT_MAINT_COMPTAG_SET
:
2155 return maint_comptag_set(data
, (void __user
*)arg
);
2156 case RIO_MPORT_MAINT_PORT_IDX_GET
:
2157 return maint_port_idx_get(data
, (void __user
*)arg
);
2158 case RIO_MPORT_GET_PROPERTIES
:
2159 md
->properties
.hdid
= md
->mport
->host_deviceid
;
2160 if (copy_to_user((void __user
*)arg
, &(md
->properties
),
2161 sizeof(md
->properties
)))
2164 case RIO_ENABLE_DOORBELL_RANGE
:
2165 return rio_mport_add_db_filter(data
, (void __user
*)arg
);
2166 case RIO_DISABLE_DOORBELL_RANGE
:
2167 return rio_mport_remove_db_filter(data
, (void __user
*)arg
);
2168 case RIO_ENABLE_PORTWRITE_RANGE
:
2169 return rio_mport_add_pw_filter(data
, (void __user
*)arg
);
2170 case RIO_DISABLE_PORTWRITE_RANGE
:
2171 return rio_mport_remove_pw_filter(data
, (void __user
*)arg
);
2172 case RIO_SET_EVENT_MASK
:
2173 data
->event_mask
= (u32
)arg
;
2175 case RIO_GET_EVENT_MASK
:
2176 if (copy_to_user((void __user
*)arg
, &data
->event_mask
,
2180 case RIO_MAP_OUTBOUND
:
2181 return rio_mport_obw_map(filp
, (void __user
*)arg
);
2182 case RIO_MAP_INBOUND
:
2183 return rio_mport_map_inbound(filp
, (void __user
*)arg
);
2184 case RIO_UNMAP_OUTBOUND
:
2185 return rio_mport_obw_free(filp
, (void __user
*)arg
);
2186 case RIO_UNMAP_INBOUND
:
2187 return rio_mport_inbound_free(filp
, (void __user
*)arg
);
2189 return rio_mport_alloc_dma(filp
, (void __user
*)arg
);
2191 return rio_mport_free_dma(filp
, (void __user
*)arg
);
2192 case RIO_WAIT_FOR_ASYNC
:
2193 return rio_mport_wait_for_async_dma(filp
, (void __user
*)arg
);
2195 return rio_mport_transfer_ioctl(filp
, (void __user
*)arg
);
2197 return rio_mport_add_riodev(data
, (void __user
*)arg
);
2199 return rio_mport_del_riodev(data
, (void __user
*)arg
);
2208 * mport_release_mapping - free mapping resources and info structure
2209 * @ref: a pointer to the kref within struct rio_mport_mapping
2211 * NOTE: Shall be called while holding buf_mutex.
2213 static void mport_release_mapping(struct kref
*ref
)
2215 struct rio_mport_mapping
*map
=
2216 container_of(ref
, struct rio_mport_mapping
, ref
);
2217 struct rio_mport
*mport
= map
->md
->mport
;
2219 rmcd_debug(MMAP
, "type %d mapping @ %p (phys = %pad) for %s",
2220 map
->dir
, map
->virt_addr
,
2221 &map
->phys_addr
, mport
->name
);
2223 list_del(&map
->node
);
2227 rio_unmap_inb_region(mport
, map
->phys_addr
);
2229 dma_free_coherent(mport
->dev
.parent
, map
->size
,
2230 map
->virt_addr
, map
->phys_addr
);
2233 rio_unmap_outb_region(mport
, map
->rioid
, map
->rio_addr
);
2239 static void mport_mm_open(struct vm_area_struct
*vma
)
2241 struct rio_mport_mapping
*map
= vma
->vm_private_data
;
2243 rmcd_debug(MMAP
, "%pad", &map
->phys_addr
);
2244 kref_get(&map
->ref
);
2247 static void mport_mm_close(struct vm_area_struct
*vma
)
2249 struct rio_mport_mapping
*map
= vma
->vm_private_data
;
2251 rmcd_debug(MMAP
, "%pad", &map
->phys_addr
);
2252 mutex_lock(&map
->md
->buf_mutex
);
2253 kref_put(&map
->ref
, mport_release_mapping
);
2254 mutex_unlock(&map
->md
->buf_mutex
);
2257 static const struct vm_operations_struct vm_ops
= {
2258 .open
= mport_mm_open
,
2259 .close
= mport_mm_close
,
2262 static int mport_cdev_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
2264 struct mport_cdev_priv
*priv
= filp
->private_data
;
2265 struct mport_dev
*md
;
2266 size_t size
= vma
->vm_end
- vma
->vm_start
;
2268 unsigned long offset
;
2270 struct rio_mport_mapping
*map
;
2272 rmcd_debug(MMAP
, "0x%x bytes at offset 0x%lx",
2273 (unsigned int)size
, vma
->vm_pgoff
);
2276 baddr
= ((dma_addr_t
)vma
->vm_pgoff
<< PAGE_SHIFT
);
2278 mutex_lock(&md
->buf_mutex
);
2279 list_for_each_entry(map
, &md
->mappings
, node
) {
2280 if (baddr
>= map
->phys_addr
&&
2281 baddr
< (map
->phys_addr
+ map
->size
)) {
2286 mutex_unlock(&md
->buf_mutex
);
2291 offset
= baddr
- map
->phys_addr
;
2293 if (size
+ offset
> map
->size
)
2296 vma
->vm_pgoff
= offset
>> PAGE_SHIFT
;
2297 rmcd_debug(MMAP
, "MMAP adjusted offset = 0x%lx", vma
->vm_pgoff
);
2299 if (map
->dir
== MAP_INBOUND
|| map
->dir
== MAP_DMA
)
2300 ret
= dma_mmap_coherent(md
->mport
->dev
.parent
, vma
,
2301 map
->virt_addr
, map
->phys_addr
, map
->size
);
2302 else if (map
->dir
== MAP_OUTBOUND
) {
2303 vma
->vm_page_prot
= pgprot_noncached(vma
->vm_page_prot
);
2304 ret
= vm_iomap_memory(vma
, map
->phys_addr
, map
->size
);
2306 rmcd_error("Attempt to mmap unsupported mapping type");
2311 vma
->vm_private_data
= map
;
2312 vma
->vm_ops
= &vm_ops
;
2315 rmcd_error("MMAP exit with err=%d", ret
);
2321 static unsigned int mport_cdev_poll(struct file
*filp
, poll_table
*wait
)
2323 struct mport_cdev_priv
*priv
= filp
->private_data
;
2325 poll_wait(filp
, &priv
->event_rx_wait
, wait
);
2326 if (kfifo_len(&priv
->event_fifo
))
2327 return POLLIN
| POLLRDNORM
;
2332 static ssize_t
mport_read(struct file
*filp
, char __user
*buf
, size_t count
,
2335 struct mport_cdev_priv
*priv
= filp
->private_data
;
2342 if (kfifo_is_empty(&priv
->event_fifo
) &&
2343 (filp
->f_flags
& O_NONBLOCK
))
2346 if (count
% sizeof(struct rio_event
))
2349 ret
= wait_event_interruptible(priv
->event_rx_wait
,
2350 kfifo_len(&priv
->event_fifo
) != 0);
2354 while (ret
< count
) {
2355 if (kfifo_to_user(&priv
->event_fifo
, buf
,
2356 sizeof(struct rio_event
), &copied
))
2365 static ssize_t
mport_write(struct file
*filp
, const char __user
*buf
,
2366 size_t count
, loff_t
*ppos
)
2368 struct mport_cdev_priv
*priv
= filp
->private_data
;
2369 struct rio_mport
*mport
= priv
->md
->mport
;
2370 struct rio_event event
;
2376 if (count
% sizeof(event
))
2380 while ((count
- len
) >= (int)sizeof(event
)) {
2381 if (copy_from_user(&event
, buf
, sizeof(event
)))
2384 if (event
.header
!= RIO_DOORBELL
)
2387 ret
= rio_mport_send_doorbell(mport
,
2388 event
.u
.doorbell
.rioid
,
2389 event
.u
.doorbell
.payload
);
2393 len
+= sizeof(event
);
2394 buf
+= sizeof(event
);
2400 static const struct file_operations mport_fops
= {
2401 .owner
= THIS_MODULE
,
2402 .open
= mport_cdev_open
,
2403 .release
= mport_cdev_release
,
2404 .poll
= mport_cdev_poll
,
2406 .write
= mport_write
,
2407 .mmap
= mport_cdev_mmap
,
2408 .fasync
= mport_cdev_fasync
,
2409 .unlocked_ioctl
= mport_cdev_ioctl
2413 * Character device management
2416 static void mport_device_release(struct device
*dev
)
2418 struct mport_dev
*md
;
2420 rmcd_debug(EXIT
, "%s", dev_name(dev
));
2421 md
= container_of(dev
, struct mport_dev
, dev
);
2426 * mport_cdev_add() - Create mport_dev from rio_mport
2427 * @mport: RapidIO master port
2429 static struct mport_dev
*mport_cdev_add(struct rio_mport
*mport
)
2432 struct mport_dev
*md
;
2433 struct rio_mport_attr attr
;
2435 md
= kzalloc(sizeof(*md
), GFP_KERNEL
);
2437 rmcd_error("Unable allocate a device object");
2442 mutex_init(&md
->buf_mutex
);
2443 mutex_init(&md
->file_mutex
);
2444 INIT_LIST_HEAD(&md
->file_list
);
2446 device_initialize(&md
->dev
);
2447 md
->dev
.devt
= MKDEV(MAJOR(dev_number
), mport
->id
);
2448 md
->dev
.class = dev_class
;
2449 md
->dev
.parent
= &mport
->dev
;
2450 md
->dev
.release
= mport_device_release
;
2451 dev_set_name(&md
->dev
, DEV_NAME
"%d", mport
->id
);
2452 atomic_set(&md
->active
, 1);
2454 cdev_init(&md
->cdev
, &mport_fops
);
2455 md
->cdev
.owner
= THIS_MODULE
;
2457 ret
= cdev_device_add(&md
->cdev
, &md
->dev
);
2459 rmcd_error("Failed to register mport %d (err=%d)",
2464 INIT_LIST_HEAD(&md
->doorbells
);
2465 spin_lock_init(&md
->db_lock
);
2466 INIT_LIST_HEAD(&md
->portwrites
);
2467 spin_lock_init(&md
->pw_lock
);
2468 INIT_LIST_HEAD(&md
->mappings
);
2470 md
->properties
.id
= mport
->id
;
2471 md
->properties
.sys_size
= mport
->sys_size
;
2472 md
->properties
.hdid
= mport
->host_deviceid
;
2473 md
->properties
.index
= mport
->index
;
2475 /* The transfer_mode property will be returned through mport query
2478 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2479 md
->properties
.transfer_mode
|= RIO_TRANSFER_MODE_MAPPED
;
2481 md
->properties
.transfer_mode
|= RIO_TRANSFER_MODE_TRANSFER
;
2483 ret
= rio_query_mport(mport
, &attr
);
2485 md
->properties
.flags
= attr
.flags
;
2486 md
->properties
.link_speed
= attr
.link_speed
;
2487 md
->properties
.link_width
= attr
.link_width
;
2488 md
->properties
.dma_max_sge
= attr
.dma_max_sge
;
2489 md
->properties
.dma_max_size
= attr
.dma_max_size
;
2490 md
->properties
.dma_align
= attr
.dma_align
;
2491 md
->properties
.cap_sys_size
= 0;
2492 md
->properties
.cap_transfer_mode
= 0;
2493 md
->properties
.cap_addr_size
= 0;
2495 pr_info(DRV_PREFIX
"Failed to obtain info for %s cdev(%d:%d)\n",
2496 mport
->name
, MAJOR(dev_number
), mport
->id
);
2498 mutex_lock(&mport_devs_lock
);
2499 list_add_tail(&md
->node
, &mport_devs
);
2500 mutex_unlock(&mport_devs_lock
);
2502 pr_info(DRV_PREFIX
"Added %s cdev(%d:%d)\n",
2503 mport
->name
, MAJOR(dev_number
), mport
->id
);
2508 put_device(&md
->dev
);
2513 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2514 * associated DMA channels.
2516 static void mport_cdev_terminate_dma(struct mport_dev
*md
)
2518 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2519 struct mport_cdev_priv
*client
;
2521 rmcd_debug(DMA
, "%s", dev_name(&md
->dev
));
2523 mutex_lock(&md
->file_mutex
);
2524 list_for_each_entry(client
, &md
->file_list
, list
) {
2525 if (client
->dmach
) {
2526 dmaengine_terminate_all(client
->dmach
);
2527 rio_release_dma(client
->dmach
);
2530 mutex_unlock(&md
->file_mutex
);
2533 dmaengine_terminate_all(md
->dma_chan
);
2534 rio_release_dma(md
->dma_chan
);
2535 md
->dma_chan
= NULL
;
2542 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2545 static int mport_cdev_kill_fasync(struct mport_dev
*md
)
2547 unsigned int files
= 0;
2548 struct mport_cdev_priv
*client
;
2550 mutex_lock(&md
->file_mutex
);
2551 list_for_each_entry(client
, &md
->file_list
, list
) {
2552 if (client
->async_queue
)
2553 kill_fasync(&client
->async_queue
, SIGIO
, POLL_HUP
);
2556 mutex_unlock(&md
->file_mutex
);
2561 * mport_cdev_remove() - Remove mport character device
2562 * @dev: Mport device to remove
2564 static void mport_cdev_remove(struct mport_dev
*md
)
2566 struct rio_mport_mapping
*map
, *_map
;
2568 rmcd_debug(EXIT
, "Remove %s cdev", md
->mport
->name
);
2569 atomic_set(&md
->active
, 0);
2570 mport_cdev_terminate_dma(md
);
2571 rio_del_mport_pw_handler(md
->mport
, md
, rio_mport_pw_handler
);
2572 cdev_device_del(&md
->cdev
, &md
->dev
);
2573 mport_cdev_kill_fasync(md
);
2575 flush_workqueue(dma_wq
);
2577 /* TODO: do we need to give clients some time to close file
2578 * descriptors? Simple wait for XX, or kref?
2582 * Release DMA buffers allocated for the mport device.
2583 * Disable associated inbound Rapidio requests mapping if applicable.
2585 mutex_lock(&md
->buf_mutex
);
2586 list_for_each_entry_safe(map
, _map
, &md
->mappings
, node
) {
2587 kref_put(&map
->ref
, mport_release_mapping
);
2589 mutex_unlock(&md
->buf_mutex
);
2591 if (!list_empty(&md
->mappings
))
2592 rmcd_warn("WARNING: %s pending mappings on removal",
2595 rio_release_inb_dbell(md
->mport
, 0, 0x0fff);
2597 put_device(&md
->dev
);
2601 * RIO rio_mport_interface driver
2605 * mport_add_mport() - Add rio_mport from LDM device struct
2606 * @dev: Linux device model struct
2607 * @class_intf: Linux class_interface
2609 static int mport_add_mport(struct device
*dev
,
2610 struct class_interface
*class_intf
)
2612 struct rio_mport
*mport
= NULL
;
2613 struct mport_dev
*chdev
= NULL
;
2615 mport
= to_rio_mport(dev
);
2619 chdev
= mport_cdev_add(mport
);
2627 * mport_remove_mport() - Remove rio_mport from global list
2628 * TODO remove device from global mport_dev list
2630 static void mport_remove_mport(struct device
*dev
,
2631 struct class_interface
*class_intf
)
2633 struct rio_mport
*mport
= NULL
;
2634 struct mport_dev
*chdev
;
2637 mport
= to_rio_mport(dev
);
2638 rmcd_debug(EXIT
, "Remove %s", mport
->name
);
2640 mutex_lock(&mport_devs_lock
);
2641 list_for_each_entry(chdev
, &mport_devs
, node
) {
2642 if (chdev
->mport
->id
== mport
->id
) {
2643 atomic_set(&chdev
->active
, 0);
2644 list_del(&chdev
->node
);
2649 mutex_unlock(&mport_devs_lock
);
2652 mport_cdev_remove(chdev
);
2655 /* the rio_mport_interface is used to handle local mport devices */
2656 static struct class_interface rio_mport_interface __refdata
= {
2657 .class = &rio_mport_class
,
2658 .add_dev
= mport_add_mport
,
2659 .remove_dev
= mport_remove_mport
,
2663 * Linux kernel module
2667 * mport_init - Driver module loading
2669 static int __init
mport_init(void)
2673 /* Create device class needed by udev */
2674 dev_class
= class_create(THIS_MODULE
, DRV_NAME
);
2675 if (IS_ERR(dev_class
)) {
2676 rmcd_error("Unable to create " DRV_NAME
" class");
2677 return PTR_ERR(dev_class
);
2680 ret
= alloc_chrdev_region(&dev_number
, 0, RIO_MAX_MPORTS
, DRV_NAME
);
2684 rmcd_debug(INIT
, "Registered class with major=%d", MAJOR(dev_number
));
2686 /* Register to rio_mport_interface */
2687 ret
= class_interface_register(&rio_mport_interface
);
2689 rmcd_error("class_interface_register() failed, err=%d", ret
);
2693 dma_wq
= create_singlethread_workqueue("dma_wq");
2695 rmcd_error("failed to create DMA work queue");
2703 class_interface_unregister(&rio_mport_interface
);
2705 unregister_chrdev_region(dev_number
, RIO_MAX_MPORTS
);
2707 class_destroy(dev_class
);
2712 * mport_exit - Driver module unloading
2714 static void __exit
mport_exit(void)
2716 class_interface_unregister(&rio_mport_interface
);
2717 class_destroy(dev_class
);
2718 unregister_chrdev_region(dev_number
, RIO_MAX_MPORTS
);
2719 destroy_workqueue(dma_wq
);
2722 module_init(mport_init
);
2723 module_exit(mport_exit
);