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_unlocked(
893 (unsigned long)xfer
->loc_addr
& PAGE_MASK
,
896 dir
== DMA_FROM_DEVICE
? FOLL_WRITE
: 0);
898 if (pinned
!= nr_pages
) {
900 rmcd_error("get_user_pages_unlocked err=%ld",
904 rmcd_error("pinned %ld out of %ld pages",
910 ret
= sg_alloc_table_from_pages(&req
->sgt
, page_list
, nr_pages
,
911 offset
, xfer
->length
, GFP_KERNEL
);
913 rmcd_error("sg_alloc_table failed with err=%d", ret
);
917 req
->page_list
= page_list
;
918 req
->nr_pages
= nr_pages
;
921 struct rio_mport_mapping
*map
;
923 baddr
= (dma_addr_t
)xfer
->handle
;
925 mutex_lock(&md
->buf_mutex
);
926 list_for_each_entry(map
, &md
->mappings
, node
) {
927 if (baddr
>= map
->phys_addr
&&
928 baddr
< (map
->phys_addr
+ map
->size
)) {
934 mutex_unlock(&md
->buf_mutex
);
936 if (req
->map
== NULL
) {
941 if (xfer
->length
+ xfer
->offset
> map
->size
) {
946 ret
= sg_alloc_table(&req
->sgt
, 1, GFP_KERNEL
);
948 rmcd_error("sg_alloc_table failed for internal buf");
952 sg_set_buf(req
->sgt
.sgl
,
953 map
->virt_addr
+ (baddr
- map
->phys_addr
) +
954 xfer
->offset
, xfer
->length
);
962 nents
= dma_map_sg(chan
->device
->dev
,
963 req
->sgt
.sgl
, req
->sgt
.nents
, dir
);
965 rmcd_error("Failed to map SG list");
970 ret
= do_dma_request(req
, xfer
, sync
, nents
);
973 if (sync
== RIO_TRANSFER_SYNC
)
975 return ret
; /* return ASYNC cookie */
978 if (ret
== -ETIMEDOUT
|| ret
== -EINTR
) {
980 * This can happen only in case of SYNC transfer.
981 * Do not free unfinished request structure immediately.
982 * Place it into pending list and deal with it later
984 spin_lock(&priv
->req_lock
);
985 list_add_tail(&req
->node
, &priv
->pend_list
);
986 spin_unlock(&priv
->req_lock
);
991 rmcd_debug(DMA
, "do_dma_request failed with err=%d", ret
);
993 dma_unmap_sg(chan
->device
->dev
, req
->sgt
.sgl
, req
->sgt
.nents
, dir
);
994 sg_free_table(&req
->sgt
);
997 for (i
= 0; i
< nr_pages
; i
++)
998 put_page(page_list
[i
]);
1003 mutex_lock(&md
->buf_mutex
);
1004 kref_put(&req
->map
->ref
, mport_release_mapping
);
1005 mutex_unlock(&md
->buf_mutex
);
1007 put_dma_channel(priv
);
1012 static int rio_mport_transfer_ioctl(struct file
*filp
, void __user
*arg
)
1014 struct mport_cdev_priv
*priv
= filp
->private_data
;
1015 struct rio_transaction transaction
;
1016 struct rio_transfer_io
*transfer
;
1017 enum dma_data_direction dir
;
1020 if (unlikely(copy_from_user(&transaction
, arg
, sizeof(transaction
))))
1023 if (transaction
.count
!= 1) /* only single transfer for now */
1026 if ((transaction
.transfer_mode
&
1027 priv
->md
->properties
.transfer_mode
) == 0)
1030 transfer
= vmalloc(transaction
.count
* sizeof(*transfer
));
1034 if (unlikely(copy_from_user(transfer
,
1035 (void __user
*)(uintptr_t)transaction
.block
,
1036 transaction
.count
* sizeof(*transfer
)))) {
1041 dir
= (transaction
.dir
== RIO_TRANSFER_DIR_READ
) ?
1042 DMA_FROM_DEVICE
: DMA_TO_DEVICE
;
1043 for (i
= 0; i
< transaction
.count
&& ret
== 0; i
++)
1044 ret
= rio_dma_transfer(filp
, transaction
.transfer_mode
,
1045 transaction
.sync
, dir
, &transfer
[i
]);
1047 if (unlikely(copy_to_user((void __user
*)(uintptr_t)transaction
.block
,
1049 transaction
.count
* sizeof(*transfer
))))
1058 static int rio_mport_wait_for_async_dma(struct file
*filp
, void __user
*arg
)
1060 struct mport_cdev_priv
*priv
;
1061 struct mport_dev
*md
;
1062 struct rio_async_tx_wait w_param
;
1063 struct mport_dma_req
*req
;
1064 dma_cookie_t cookie
;
1070 priv
= (struct mport_cdev_priv
*)filp
->private_data
;
1073 if (unlikely(copy_from_user(&w_param
, arg
, sizeof(w_param
))))
1076 cookie
= w_param
.token
;
1077 if (w_param
.timeout
)
1078 tmo
= msecs_to_jiffies(w_param
.timeout
);
1079 else /* Use default DMA timeout */
1080 tmo
= msecs_to_jiffies(dma_timeout
);
1082 spin_lock(&priv
->req_lock
);
1083 list_for_each_entry(req
, &priv
->async_list
, node
) {
1084 if (req
->cookie
== cookie
) {
1085 list_del(&req
->node
);
1090 spin_unlock(&priv
->req_lock
);
1095 wret
= wait_for_completion_interruptible_timeout(&req
->req_comp
, tmo
);
1098 /* Timeout on wait occurred */
1099 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1100 current
->comm
, task_pid_nr(current
),
1101 (req
->dir
== DMA_FROM_DEVICE
)?"READ":"WRITE");
1104 } else if (wret
== -ERESTARTSYS
) {
1105 /* Wait_for_completion was interrupted by a signal but DMA may
1106 * be still in progress
1108 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1109 current
->comm
, task_pid_nr(current
),
1110 (req
->dir
== DMA_FROM_DEVICE
)?"READ":"WRITE");
1115 if (req
->status
!= DMA_COMPLETE
) {
1116 /* DMA transaction completion signaled with transfer error */
1117 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1118 current
->comm
, task_pid_nr(current
),
1119 (req
->dir
== DMA_FROM_DEVICE
)?"READ":"WRITE",
1125 if (req
->status
!= DMA_IN_PROGRESS
&& req
->status
!= DMA_PAUSED
)
1131 /* Return request back into async queue */
1132 spin_lock(&priv
->req_lock
);
1133 list_add_tail(&req
->node
, &priv
->async_list
);
1134 spin_unlock(&priv
->req_lock
);
1138 static int rio_mport_create_dma_mapping(struct mport_dev
*md
, struct file
*filp
,
1139 u64 size
, struct rio_mport_mapping
**mapping
)
1141 struct rio_mport_mapping
*map
;
1143 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
1147 map
->virt_addr
= dma_alloc_coherent(md
->mport
->dev
.parent
, size
,
1148 &map
->phys_addr
, GFP_KERNEL
);
1149 if (map
->virt_addr
== NULL
) {
1158 kref_init(&map
->ref
);
1159 mutex_lock(&md
->buf_mutex
);
1160 list_add_tail(&map
->node
, &md
->mappings
);
1161 mutex_unlock(&md
->buf_mutex
);
1167 static int rio_mport_alloc_dma(struct file
*filp
, void __user
*arg
)
1169 struct mport_cdev_priv
*priv
= filp
->private_data
;
1170 struct mport_dev
*md
= priv
->md
;
1171 struct rio_dma_mem map
;
1172 struct rio_mport_mapping
*mapping
= NULL
;
1175 if (unlikely(copy_from_user(&map
, arg
, sizeof(map
))))
1178 ret
= rio_mport_create_dma_mapping(md
, filp
, map
.length
, &mapping
);
1182 map
.dma_handle
= mapping
->phys_addr
;
1184 if (unlikely(copy_to_user(arg
, &map
, sizeof(map
)))) {
1185 mutex_lock(&md
->buf_mutex
);
1186 kref_put(&mapping
->ref
, mport_release_mapping
);
1187 mutex_unlock(&md
->buf_mutex
);
1194 static int rio_mport_free_dma(struct file
*filp
, void __user
*arg
)
1196 struct mport_cdev_priv
*priv
= filp
->private_data
;
1197 struct mport_dev
*md
= priv
->md
;
1200 struct rio_mport_mapping
*map
, *_map
;
1202 if (copy_from_user(&handle
, arg
, sizeof(handle
)))
1204 rmcd_debug(EXIT
, "filp=%p", filp
);
1206 mutex_lock(&md
->buf_mutex
);
1207 list_for_each_entry_safe(map
, _map
, &md
->mappings
, node
) {
1208 if (map
->dir
== MAP_DMA
&& map
->phys_addr
== handle
&&
1209 map
->filp
== filp
) {
1210 kref_put(&map
->ref
, mport_release_mapping
);
1215 mutex_unlock(&md
->buf_mutex
);
1217 if (ret
== -EFAULT
) {
1218 rmcd_debug(DMA
, "ERR no matching mapping");
1225 static int rio_mport_transfer_ioctl(struct file
*filp
, void *arg
)
1230 static int rio_mport_wait_for_async_dma(struct file
*filp
, void __user
*arg
)
1235 static int rio_mport_alloc_dma(struct file
*filp
, void __user
*arg
)
1240 static int rio_mport_free_dma(struct file
*filp
, void __user
*arg
)
1244 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1247 * Inbound/outbound memory mapping functions
1251 rio_mport_create_inbound_mapping(struct mport_dev
*md
, struct file
*filp
,
1252 u64 raddr
, u64 size
,
1253 struct rio_mport_mapping
**mapping
)
1255 struct rio_mport
*mport
= md
->mport
;
1256 struct rio_mport_mapping
*map
;
1259 /* rio_map_inb_region() accepts u32 size */
1260 if (size
> 0xffffffff)
1263 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
1267 map
->virt_addr
= dma_alloc_coherent(mport
->dev
.parent
, size
,
1268 &map
->phys_addr
, GFP_KERNEL
);
1269 if (map
->virt_addr
== NULL
) {
1274 if (raddr
== RIO_MAP_ANY_ADDR
)
1275 raddr
= map
->phys_addr
;
1276 ret
= rio_map_inb_region(mport
, map
->phys_addr
, raddr
, (u32
)size
, 0);
1280 map
->dir
= MAP_INBOUND
;
1281 map
->rio_addr
= raddr
;
1285 kref_init(&map
->ref
);
1286 mutex_lock(&md
->buf_mutex
);
1287 list_add_tail(&map
->node
, &md
->mappings
);
1288 mutex_unlock(&md
->buf_mutex
);
1293 dma_free_coherent(mport
->dev
.parent
, size
,
1294 map
->virt_addr
, map
->phys_addr
);
1301 rio_mport_get_inbound_mapping(struct mport_dev
*md
, struct file
*filp
,
1302 u64 raddr
, u64 size
,
1303 struct rio_mport_mapping
**mapping
)
1305 struct rio_mport_mapping
*map
;
1308 if (raddr
== RIO_MAP_ANY_ADDR
)
1311 mutex_lock(&md
->buf_mutex
);
1312 list_for_each_entry(map
, &md
->mappings
, node
) {
1313 if (map
->dir
!= MAP_INBOUND
)
1315 if (raddr
== map
->rio_addr
&& size
== map
->size
) {
1316 /* allow exact match only */
1320 } else if (raddr
< (map
->rio_addr
+ map
->size
- 1) &&
1321 (raddr
+ size
) > map
->rio_addr
) {
1326 mutex_unlock(&md
->buf_mutex
);
1331 /* not found, create new */
1332 return rio_mport_create_inbound_mapping(md
, filp
, raddr
, size
, mapping
);
1335 static int rio_mport_map_inbound(struct file
*filp
, void __user
*arg
)
1337 struct mport_cdev_priv
*priv
= filp
->private_data
;
1338 struct mport_dev
*md
= priv
->md
;
1339 struct rio_mmap map
;
1340 struct rio_mport_mapping
*mapping
= NULL
;
1343 if (!md
->mport
->ops
->map_inb
)
1344 return -EPROTONOSUPPORT
;
1345 if (unlikely(copy_from_user(&map
, arg
, sizeof(map
))))
1348 rmcd_debug(IBW
, "%s filp=%p", dev_name(&priv
->md
->dev
), filp
);
1350 ret
= rio_mport_get_inbound_mapping(md
, filp
, map
.rio_addr
,
1351 map
.length
, &mapping
);
1355 map
.handle
= mapping
->phys_addr
;
1356 map
.rio_addr
= mapping
->rio_addr
;
1358 if (unlikely(copy_to_user(arg
, &map
, sizeof(map
)))) {
1359 /* Delete mapping if it was created by this request */
1360 if (ret
== 0 && mapping
->filp
== filp
) {
1361 mutex_lock(&md
->buf_mutex
);
1362 kref_put(&mapping
->ref
, mport_release_mapping
);
1363 mutex_unlock(&md
->buf_mutex
);
1372 * rio_mport_inbound_free() - unmap from RapidIO address space and free
1373 * previously allocated inbound DMA coherent buffer
1374 * @priv: driver private data
1375 * @arg: buffer handle returned by allocation routine
1377 static int rio_mport_inbound_free(struct file
*filp
, void __user
*arg
)
1379 struct mport_cdev_priv
*priv
= filp
->private_data
;
1380 struct mport_dev
*md
= priv
->md
;
1382 struct rio_mport_mapping
*map
, *_map
;
1384 rmcd_debug(IBW
, "%s filp=%p", dev_name(&priv
->md
->dev
), filp
);
1386 if (!md
->mport
->ops
->unmap_inb
)
1387 return -EPROTONOSUPPORT
;
1389 if (copy_from_user(&handle
, arg
, sizeof(handle
)))
1392 mutex_lock(&md
->buf_mutex
);
1393 list_for_each_entry_safe(map
, _map
, &md
->mappings
, node
) {
1394 if (map
->dir
== MAP_INBOUND
&& map
->phys_addr
== handle
) {
1395 if (map
->filp
== filp
) {
1397 kref_put(&map
->ref
, mport_release_mapping
);
1402 mutex_unlock(&md
->buf_mutex
);
1408 * maint_port_idx_get() - Get the port index of the mport instance
1409 * @priv: driver private data
1412 static int maint_port_idx_get(struct mport_cdev_priv
*priv
, void __user
*arg
)
1414 struct mport_dev
*md
= priv
->md
;
1415 u32 port_idx
= md
->mport
->index
;
1417 rmcd_debug(MPORT
, "port_index=%d", port_idx
);
1419 if (copy_to_user(arg
, &port_idx
, sizeof(port_idx
)))
1425 static int rio_mport_add_event(struct mport_cdev_priv
*priv
,
1426 struct rio_event
*event
)
1430 if (!(priv
->event_mask
& event
->header
))
1433 spin_lock(&priv
->fifo_lock
);
1434 overflow
= kfifo_avail(&priv
->event_fifo
) < sizeof(*event
)
1435 || kfifo_in(&priv
->event_fifo
, (unsigned char *)event
,
1436 sizeof(*event
)) != sizeof(*event
);
1437 spin_unlock(&priv
->fifo_lock
);
1439 wake_up_interruptible(&priv
->event_rx_wait
);
1442 dev_warn(&priv
->md
->dev
, DRV_NAME
": event fifo overflow\n");
1449 static void rio_mport_doorbell_handler(struct rio_mport
*mport
, void *dev_id
,
1450 u16 src
, u16 dst
, u16 info
)
1452 struct mport_dev
*data
= dev_id
;
1453 struct mport_cdev_priv
*priv
;
1454 struct rio_mport_db_filter
*db_filter
;
1455 struct rio_event event
;
1458 event
.header
= RIO_DOORBELL
;
1459 event
.u
.doorbell
.rioid
= src
;
1460 event
.u
.doorbell
.payload
= info
;
1463 spin_lock(&data
->db_lock
);
1464 list_for_each_entry(db_filter
, &data
->doorbells
, data_node
) {
1465 if (((db_filter
->filter
.rioid
== RIO_INVALID_DESTID
||
1466 db_filter
->filter
.rioid
== src
)) &&
1467 info
>= db_filter
->filter
.low
&&
1468 info
<= db_filter
->filter
.high
) {
1469 priv
= db_filter
->priv
;
1470 rio_mport_add_event(priv
, &event
);
1474 spin_unlock(&data
->db_lock
);
1477 dev_warn(&data
->dev
,
1478 "%s: spurious DB received from 0x%x, info=0x%04x\n",
1479 __func__
, src
, info
);
1482 static int rio_mport_add_db_filter(struct mport_cdev_priv
*priv
,
1485 struct mport_dev
*md
= priv
->md
;
1486 struct rio_mport_db_filter
*db_filter
;
1487 struct rio_doorbell_filter filter
;
1488 unsigned long flags
;
1491 if (copy_from_user(&filter
, arg
, sizeof(filter
)))
1494 if (filter
.low
> filter
.high
)
1497 ret
= rio_request_inb_dbell(md
->mport
, md
, filter
.low
, filter
.high
,
1498 rio_mport_doorbell_handler
);
1500 rmcd_error("%s failed to register IBDB, err=%d",
1501 dev_name(&md
->dev
), ret
);
1505 db_filter
= kzalloc(sizeof(*db_filter
), GFP_KERNEL
);
1506 if (db_filter
== NULL
) {
1507 rio_release_inb_dbell(md
->mport
, filter
.low
, filter
.high
);
1511 db_filter
->filter
= filter
;
1512 db_filter
->priv
= priv
;
1513 spin_lock_irqsave(&md
->db_lock
, flags
);
1514 list_add_tail(&db_filter
->priv_node
, &priv
->db_filters
);
1515 list_add_tail(&db_filter
->data_node
, &md
->doorbells
);
1516 spin_unlock_irqrestore(&md
->db_lock
, flags
);
1521 static void rio_mport_delete_db_filter(struct rio_mport_db_filter
*db_filter
)
1523 list_del(&db_filter
->data_node
);
1524 list_del(&db_filter
->priv_node
);
1528 static int rio_mport_remove_db_filter(struct mport_cdev_priv
*priv
,
1531 struct rio_mport_db_filter
*db_filter
;
1532 struct rio_doorbell_filter filter
;
1533 unsigned long flags
;
1536 if (copy_from_user(&filter
, arg
, sizeof(filter
)))
1539 if (filter
.low
> filter
.high
)
1542 spin_lock_irqsave(&priv
->md
->db_lock
, flags
);
1543 list_for_each_entry(db_filter
, &priv
->db_filters
, priv_node
) {
1544 if (db_filter
->filter
.rioid
== filter
.rioid
&&
1545 db_filter
->filter
.low
== filter
.low
&&
1546 db_filter
->filter
.high
== filter
.high
) {
1547 rio_mport_delete_db_filter(db_filter
);
1552 spin_unlock_irqrestore(&priv
->md
->db_lock
, flags
);
1555 rio_release_inb_dbell(priv
->md
->mport
, filter
.low
, filter
.high
);
1560 static int rio_mport_match_pw(union rio_pw_msg
*msg
,
1561 struct rio_pw_filter
*filter
)
1563 if ((msg
->em
.comptag
& filter
->mask
) < filter
->low
||
1564 (msg
->em
.comptag
& filter
->mask
) > filter
->high
)
1569 static int rio_mport_pw_handler(struct rio_mport
*mport
, void *context
,
1570 union rio_pw_msg
*msg
, int step
)
1572 struct mport_dev
*md
= context
;
1573 struct mport_cdev_priv
*priv
;
1574 struct rio_mport_pw_filter
*pw_filter
;
1575 struct rio_event event
;
1578 event
.header
= RIO_PORTWRITE
;
1579 memcpy(event
.u
.portwrite
.payload
, msg
->raw
, RIO_PW_MSG_SIZE
);
1582 spin_lock(&md
->pw_lock
);
1583 list_for_each_entry(pw_filter
, &md
->portwrites
, md_node
) {
1584 if (rio_mport_match_pw(msg
, &pw_filter
->filter
)) {
1585 priv
= pw_filter
->priv
;
1586 rio_mport_add_event(priv
, &event
);
1590 spin_unlock(&md
->pw_lock
);
1593 printk_ratelimited(KERN_WARNING DRV_NAME
1594 ": mport%d received spurious PW from 0x%08x\n",
1595 mport
->id
, msg
->em
.comptag
);
1601 static int rio_mport_add_pw_filter(struct mport_cdev_priv
*priv
,
1604 struct mport_dev
*md
= priv
->md
;
1605 struct rio_mport_pw_filter
*pw_filter
;
1606 struct rio_pw_filter filter
;
1607 unsigned long flags
;
1610 if (copy_from_user(&filter
, arg
, sizeof(filter
)))
1613 pw_filter
= kzalloc(sizeof(*pw_filter
), GFP_KERNEL
);
1614 if (pw_filter
== NULL
)
1617 pw_filter
->filter
= filter
;
1618 pw_filter
->priv
= priv
;
1619 spin_lock_irqsave(&md
->pw_lock
, flags
);
1620 if (list_empty(&md
->portwrites
))
1622 list_add_tail(&pw_filter
->priv_node
, &priv
->pw_filters
);
1623 list_add_tail(&pw_filter
->md_node
, &md
->portwrites
);
1624 spin_unlock_irqrestore(&md
->pw_lock
, flags
);
1629 ret
= rio_add_mport_pw_handler(md
->mport
, md
,
1630 rio_mport_pw_handler
);
1633 "%s: failed to add IB_PW handler, err=%d\n",
1637 rio_pw_enable(md
->mport
, 1);
1643 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter
*pw_filter
)
1645 list_del(&pw_filter
->md_node
);
1646 list_del(&pw_filter
->priv_node
);
1650 static int rio_mport_match_pw_filter(struct rio_pw_filter
*a
,
1651 struct rio_pw_filter
*b
)
1653 if ((a
->mask
== b
->mask
) && (a
->low
== b
->low
) && (a
->high
== b
->high
))
1658 static int rio_mport_remove_pw_filter(struct mport_cdev_priv
*priv
,
1661 struct mport_dev
*md
= priv
->md
;
1662 struct rio_mport_pw_filter
*pw_filter
;
1663 struct rio_pw_filter filter
;
1664 unsigned long flags
;
1668 if (copy_from_user(&filter
, arg
, sizeof(filter
)))
1671 spin_lock_irqsave(&md
->pw_lock
, flags
);
1672 list_for_each_entry(pw_filter
, &priv
->pw_filters
, priv_node
) {
1673 if (rio_mport_match_pw_filter(&pw_filter
->filter
, &filter
)) {
1674 rio_mport_delete_pw_filter(pw_filter
);
1680 if (list_empty(&md
->portwrites
))
1682 spin_unlock_irqrestore(&md
->pw_lock
, flags
);
1685 rio_del_mport_pw_handler(md
->mport
, priv
->md
,
1686 rio_mport_pw_handler
);
1687 rio_pw_enable(md
->mport
, 0);
1694 * rio_release_dev - release routine for kernel RIO device object
1695 * @dev: kernel device object associated with a RIO device structure
1697 * Frees a RIO device struct associated a RIO device struct.
1698 * The RIO device struct is freed.
1700 static void rio_release_dev(struct device
*dev
)
1702 struct rio_dev
*rdev
;
1704 rdev
= to_rio_dev(dev
);
1705 pr_info(DRV_PREFIX
"%s: %s\n", __func__
, rio_name(rdev
));
1710 static void rio_release_net(struct device
*dev
)
1712 struct rio_net
*net
;
1714 net
= to_rio_net(dev
);
1715 rmcd_debug(RDEV
, "net_%d", net
->id
);
1721 * rio_mport_add_riodev - creates a kernel RIO device object
1723 * Allocates a RIO device data structure and initializes required fields based
1724 * on device's configuration space contents.
1725 * If the device has switch capabilities, then a switch specific portion is
1726 * allocated and configured.
1728 static int rio_mport_add_riodev(struct mport_cdev_priv
*priv
,
1731 struct mport_dev
*md
= priv
->md
;
1732 struct rio_rdev_info dev_info
;
1733 struct rio_dev
*rdev
;
1734 struct rio_switch
*rswitch
= NULL
;
1735 struct rio_mport
*mport
;
1743 if (copy_from_user(&dev_info
, arg
, sizeof(dev_info
)))
1746 rmcd_debug(RDEV
, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info
.name
,
1747 dev_info
.comptag
, dev_info
.destid
, dev_info
.hopcount
);
1749 if (bus_find_device_by_name(&rio_bus_type
, NULL
, dev_info
.name
)) {
1750 rmcd_debug(RDEV
, "device %s already exists", dev_info
.name
);
1754 size
= sizeof(*rdev
);
1756 destid
= dev_info
.destid
;
1757 hopcount
= dev_info
.hopcount
;
1759 if (rio_mport_read_config_32(mport
, destid
, hopcount
,
1760 RIO_PEF_CAR
, &rval
))
1763 if (rval
& RIO_PEF_SWITCH
) {
1764 rio_mport_read_config_32(mport
, destid
, hopcount
,
1765 RIO_SWP_INFO_CAR
, &swpinfo
);
1766 size
+= (RIO_GET_TOTAL_PORTS(swpinfo
) *
1767 sizeof(rswitch
->nextdev
[0])) + sizeof(*rswitch
);
1770 rdev
= kzalloc(size
, GFP_KERNEL
);
1774 if (mport
->net
== NULL
) {
1775 struct rio_net
*net
;
1777 net
= rio_alloc_net(mport
);
1780 rmcd_debug(RDEV
, "failed to allocate net object");
1784 net
->id
= mport
->id
;
1786 dev_set_name(&net
->dev
, "rnet_%d", net
->id
);
1787 net
->dev
.parent
= &mport
->dev
;
1788 net
->dev
.release
= rio_release_net
;
1789 err
= rio_add_net(net
);
1791 rmcd_debug(RDEV
, "failed to register net, err=%d", err
);
1797 rdev
->net
= mport
->net
;
1799 rdev
->swpinfo
= swpinfo
;
1800 rio_mport_read_config_32(mport
, destid
, hopcount
,
1801 RIO_DEV_ID_CAR
, &rval
);
1802 rdev
->did
= rval
>> 16;
1803 rdev
->vid
= rval
& 0xffff;
1804 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_DEV_INFO_CAR
,
1806 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_ASM_ID_CAR
,
1808 rdev
->asm_did
= rval
>> 16;
1809 rdev
->asm_vid
= rval
& 0xffff;
1810 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_ASM_INFO_CAR
,
1812 rdev
->asm_rev
= rval
>> 16;
1814 if (rdev
->pef
& RIO_PEF_EXT_FEATURES
) {
1815 rdev
->efptr
= rval
& 0xffff;
1816 rdev
->phys_efptr
= rio_mport_get_physefb(mport
, 0, destid
,
1817 hopcount
, &rdev
->phys_rmap
);
1819 rdev
->em_efptr
= rio_mport_get_feature(mport
, 0, destid
,
1820 hopcount
, RIO_EFB_ERR_MGMNT
);
1823 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_SRC_OPS_CAR
,
1825 rio_mport_read_config_32(mport
, destid
, hopcount
, RIO_DST_OPS_CAR
,
1828 rdev
->comp_tag
= dev_info
.comptag
;
1829 rdev
->destid
= destid
;
1830 /* hopcount is stored as specified by a caller, regardles of EP or SW */
1831 rdev
->hopcount
= hopcount
;
1833 if (rdev
->pef
& RIO_PEF_SWITCH
) {
1834 rswitch
= rdev
->rswitch
;
1835 rswitch
->route_table
= NULL
;
1838 if (strlen(dev_info
.name
))
1839 dev_set_name(&rdev
->dev
, "%s", dev_info
.name
);
1840 else if (rdev
->pef
& RIO_PEF_SWITCH
)
1841 dev_set_name(&rdev
->dev
, "%02x:s:%04x", mport
->id
,
1842 rdev
->comp_tag
& RIO_CTAG_UDEVID
);
1844 dev_set_name(&rdev
->dev
, "%02x:e:%04x", mport
->id
,
1845 rdev
->comp_tag
& RIO_CTAG_UDEVID
);
1847 INIT_LIST_HEAD(&rdev
->net_list
);
1848 rdev
->dev
.parent
= &mport
->net
->dev
;
1849 rio_attach_device(rdev
);
1850 rdev
->dev
.release
= rio_release_dev
;
1852 if (rdev
->dst_ops
& RIO_DST_OPS_DOORBELL
)
1853 rio_init_dbell_res(&rdev
->riores
[RIO_DOORBELL_RESOURCE
],
1855 err
= rio_add_device(rdev
);
1866 static int rio_mport_del_riodev(struct mport_cdev_priv
*priv
, void __user
*arg
)
1868 struct rio_rdev_info dev_info
;
1869 struct rio_dev
*rdev
= NULL
;
1871 struct rio_mport
*mport
;
1872 struct rio_net
*net
;
1874 if (copy_from_user(&dev_info
, arg
, sizeof(dev_info
)))
1877 mport
= priv
->md
->mport
;
1879 /* If device name is specified, removal by name has priority */
1880 if (strlen(dev_info
.name
)) {
1881 dev
= bus_find_device_by_name(&rio_bus_type
, NULL
,
1884 rdev
= to_rio_dev(dev
);
1887 rdev
= rio_get_comptag(dev_info
.comptag
, rdev
);
1888 if (rdev
&& rdev
->dev
.parent
== &mport
->net
->dev
&&
1889 rdev
->destid
== dev_info
.destid
&&
1890 rdev
->hopcount
== dev_info
.hopcount
)
1897 "device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1898 dev_info
.name
, dev_info
.comptag
, dev_info
.destid
,
1905 rio_del_device(rdev
, RIO_DEVICE_SHUTDOWN
);
1907 if (list_empty(&net
->devices
)) {
1916 * Mport cdev management
1920 * mport_cdev_open() - Open character device (mport)
1922 static int mport_cdev_open(struct inode
*inode
, struct file
*filp
)
1925 int minor
= iminor(inode
);
1926 struct mport_dev
*chdev
;
1927 struct mport_cdev_priv
*priv
;
1929 /* Test for valid device */
1930 if (minor
>= RIO_MAX_MPORTS
) {
1931 rmcd_error("Invalid minor device number");
1935 chdev
= container_of(inode
->i_cdev
, struct mport_dev
, cdev
);
1937 rmcd_debug(INIT
, "%s filp=%p", dev_name(&chdev
->dev
), filp
);
1939 if (atomic_read(&chdev
->active
) == 0)
1942 get_device(&chdev
->dev
);
1944 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1946 put_device(&chdev
->dev
);
1952 mutex_lock(&chdev
->file_mutex
);
1953 list_add_tail(&priv
->list
, &chdev
->file_list
);
1954 mutex_unlock(&chdev
->file_mutex
);
1956 INIT_LIST_HEAD(&priv
->db_filters
);
1957 INIT_LIST_HEAD(&priv
->pw_filters
);
1958 spin_lock_init(&priv
->fifo_lock
);
1959 init_waitqueue_head(&priv
->event_rx_wait
);
1960 ret
= kfifo_alloc(&priv
->event_fifo
,
1961 sizeof(struct rio_event
) * MPORT_EVENT_DEPTH
,
1964 dev_err(&chdev
->dev
, DRV_NAME
": kfifo_alloc failed\n");
1969 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1970 INIT_LIST_HEAD(&priv
->async_list
);
1971 INIT_LIST_HEAD(&priv
->pend_list
);
1972 spin_lock_init(&priv
->req_lock
);
1973 mutex_init(&priv
->dma_lock
);
1976 filp
->private_data
= priv
;
1984 static int mport_cdev_fasync(int fd
, struct file
*filp
, int mode
)
1986 struct mport_cdev_priv
*priv
= filp
->private_data
;
1988 return fasync_helper(fd
, filp
, mode
, &priv
->async_queue
);
1991 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1992 static void mport_cdev_release_dma(struct file
*filp
)
1994 struct mport_cdev_priv
*priv
= filp
->private_data
;
1995 struct mport_dev
*md
;
1996 struct mport_dma_req
*req
, *req_next
;
1997 unsigned long tmo
= msecs_to_jiffies(dma_timeout
);
2001 rmcd_debug(EXIT
, "from filp=%p %s(%d)",
2002 filp
, current
->comm
, task_pid_nr(current
));
2005 rmcd_debug(EXIT
, "No DMA channel for filp=%p", filp
);
2011 flush_workqueue(dma_wq
);
2013 spin_lock(&priv
->req_lock
);
2014 if (!list_empty(&priv
->async_list
)) {
2015 rmcd_debug(EXIT
, "async list not empty filp=%p %s(%d)",
2016 filp
, current
->comm
, task_pid_nr(current
));
2017 list_splice_init(&priv
->async_list
, &list
);
2019 spin_unlock(&priv
->req_lock
);
2021 if (!list_empty(&list
)) {
2022 rmcd_debug(EXIT
, "temp list not empty");
2023 list_for_each_entry_safe(req
, req_next
, &list
, node
) {
2024 rmcd_debug(EXIT
, "free req->filp=%p cookie=%d compl=%s",
2025 req
->filp
, req
->cookie
,
2026 completion_done(&req
->req_comp
)?"yes":"no");
2027 list_del(&req
->node
);
2032 if (!list_empty(&priv
->pend_list
)) {
2033 rmcd_debug(EXIT
, "Free pending DMA requests for filp=%p %s(%d)",
2034 filp
, current
->comm
, task_pid_nr(current
));
2035 list_for_each_entry_safe(req
,
2036 req_next
, &priv
->pend_list
, node
) {
2037 rmcd_debug(EXIT
, "free req->filp=%p cookie=%d compl=%s",
2038 req
->filp
, req
->cookie
,
2039 completion_done(&req
->req_comp
)?"yes":"no");
2040 list_del(&req
->node
);
2045 put_dma_channel(priv
);
2046 wret
= wait_for_completion_interruptible_timeout(&priv
->comp
, tmo
);
2049 rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
2050 current
->comm
, task_pid_nr(current
), wret
);
2053 spin_lock(&priv
->req_lock
);
2055 if (!list_empty(&priv
->pend_list
)) {
2056 rmcd_debug(EXIT
, "ATTN: pending DMA requests, filp=%p %s(%d)",
2057 filp
, current
->comm
, task_pid_nr(current
));
2060 spin_unlock(&priv
->req_lock
);
2062 if (priv
->dmach
!= priv
->md
->dma_chan
) {
2063 rmcd_debug(EXIT
, "Release DMA channel for filp=%p %s(%d)",
2064 filp
, current
->comm
, task_pid_nr(current
));
2065 rio_release_dma(priv
->dmach
);
2067 rmcd_debug(EXIT
, "Adjust default DMA channel refcount");
2068 kref_put(&md
->dma_ref
, mport_release_def_dma
);
2074 #define mport_cdev_release_dma(priv) do {} while (0)
2078 * mport_cdev_release() - Release character device
2080 static int mport_cdev_release(struct inode
*inode
, struct file
*filp
)
2082 struct mport_cdev_priv
*priv
= filp
->private_data
;
2083 struct mport_dev
*chdev
;
2084 struct rio_mport_pw_filter
*pw_filter
, *pw_filter_next
;
2085 struct rio_mport_db_filter
*db_filter
, *db_filter_next
;
2086 struct rio_mport_mapping
*map
, *_map
;
2087 unsigned long flags
;
2089 rmcd_debug(EXIT
, "%s filp=%p", dev_name(&priv
->md
->dev
), filp
);
2092 mport_cdev_release_dma(filp
);
2094 priv
->event_mask
= 0;
2096 spin_lock_irqsave(&chdev
->pw_lock
, flags
);
2097 if (!list_empty(&priv
->pw_filters
)) {
2098 list_for_each_entry_safe(pw_filter
, pw_filter_next
,
2099 &priv
->pw_filters
, priv_node
)
2100 rio_mport_delete_pw_filter(pw_filter
);
2102 spin_unlock_irqrestore(&chdev
->pw_lock
, flags
);
2104 spin_lock_irqsave(&chdev
->db_lock
, flags
);
2105 list_for_each_entry_safe(db_filter
, db_filter_next
,
2106 &priv
->db_filters
, priv_node
) {
2107 rio_mport_delete_db_filter(db_filter
);
2109 spin_unlock_irqrestore(&chdev
->db_lock
, flags
);
2111 kfifo_free(&priv
->event_fifo
);
2113 mutex_lock(&chdev
->buf_mutex
);
2114 list_for_each_entry_safe(map
, _map
, &chdev
->mappings
, node
) {
2115 if (map
->filp
== filp
) {
2116 rmcd_debug(EXIT
, "release mapping %p filp=%p",
2117 map
->virt_addr
, filp
);
2118 kref_put(&map
->ref
, mport_release_mapping
);
2121 mutex_unlock(&chdev
->buf_mutex
);
2123 mport_cdev_fasync(-1, filp
, 0);
2124 filp
->private_data
= NULL
;
2125 mutex_lock(&chdev
->file_mutex
);
2126 list_del(&priv
->list
);
2127 mutex_unlock(&chdev
->file_mutex
);
2128 put_device(&chdev
->dev
);
2134 * mport_cdev_ioctl() - IOCTLs for character device
2136 static long mport_cdev_ioctl(struct file
*filp
,
2137 unsigned int cmd
, unsigned long arg
)
2140 struct mport_cdev_priv
*data
= filp
->private_data
;
2141 struct mport_dev
*md
= data
->md
;
2143 if (atomic_read(&md
->active
) == 0)
2147 case RIO_MPORT_MAINT_READ_LOCAL
:
2148 return rio_mport_maint_rd(data
, (void __user
*)arg
, 1);
2149 case RIO_MPORT_MAINT_WRITE_LOCAL
:
2150 return rio_mport_maint_wr(data
, (void __user
*)arg
, 1);
2151 case RIO_MPORT_MAINT_READ_REMOTE
:
2152 return rio_mport_maint_rd(data
, (void __user
*)arg
, 0);
2153 case RIO_MPORT_MAINT_WRITE_REMOTE
:
2154 return rio_mport_maint_wr(data
, (void __user
*)arg
, 0);
2155 case RIO_MPORT_MAINT_HDID_SET
:
2156 return maint_hdid_set(data
, (void __user
*)arg
);
2157 case RIO_MPORT_MAINT_COMPTAG_SET
:
2158 return maint_comptag_set(data
, (void __user
*)arg
);
2159 case RIO_MPORT_MAINT_PORT_IDX_GET
:
2160 return maint_port_idx_get(data
, (void __user
*)arg
);
2161 case RIO_MPORT_GET_PROPERTIES
:
2162 md
->properties
.hdid
= md
->mport
->host_deviceid
;
2163 if (copy_to_user((void __user
*)arg
, &(md
->properties
),
2164 sizeof(md
->properties
)))
2167 case RIO_ENABLE_DOORBELL_RANGE
:
2168 return rio_mport_add_db_filter(data
, (void __user
*)arg
);
2169 case RIO_DISABLE_DOORBELL_RANGE
:
2170 return rio_mport_remove_db_filter(data
, (void __user
*)arg
);
2171 case RIO_ENABLE_PORTWRITE_RANGE
:
2172 return rio_mport_add_pw_filter(data
, (void __user
*)arg
);
2173 case RIO_DISABLE_PORTWRITE_RANGE
:
2174 return rio_mport_remove_pw_filter(data
, (void __user
*)arg
);
2175 case RIO_SET_EVENT_MASK
:
2176 data
->event_mask
= (u32
)arg
;
2178 case RIO_GET_EVENT_MASK
:
2179 if (copy_to_user((void __user
*)arg
, &data
->event_mask
,
2183 case RIO_MAP_OUTBOUND
:
2184 return rio_mport_obw_map(filp
, (void __user
*)arg
);
2185 case RIO_MAP_INBOUND
:
2186 return rio_mport_map_inbound(filp
, (void __user
*)arg
);
2187 case RIO_UNMAP_OUTBOUND
:
2188 return rio_mport_obw_free(filp
, (void __user
*)arg
);
2189 case RIO_UNMAP_INBOUND
:
2190 return rio_mport_inbound_free(filp
, (void __user
*)arg
);
2192 return rio_mport_alloc_dma(filp
, (void __user
*)arg
);
2194 return rio_mport_free_dma(filp
, (void __user
*)arg
);
2195 case RIO_WAIT_FOR_ASYNC
:
2196 return rio_mport_wait_for_async_dma(filp
, (void __user
*)arg
);
2198 return rio_mport_transfer_ioctl(filp
, (void __user
*)arg
);
2200 return rio_mport_add_riodev(data
, (void __user
*)arg
);
2202 return rio_mport_del_riodev(data
, (void __user
*)arg
);
2211 * mport_release_mapping - free mapping resources and info structure
2212 * @ref: a pointer to the kref within struct rio_mport_mapping
2214 * NOTE: Shall be called while holding buf_mutex.
2216 static void mport_release_mapping(struct kref
*ref
)
2218 struct rio_mport_mapping
*map
=
2219 container_of(ref
, struct rio_mport_mapping
, ref
);
2220 struct rio_mport
*mport
= map
->md
->mport
;
2222 rmcd_debug(MMAP
, "type %d mapping @ %p (phys = %pad) for %s",
2223 map
->dir
, map
->virt_addr
,
2224 &map
->phys_addr
, mport
->name
);
2226 list_del(&map
->node
);
2230 rio_unmap_inb_region(mport
, map
->phys_addr
);
2232 dma_free_coherent(mport
->dev
.parent
, map
->size
,
2233 map
->virt_addr
, map
->phys_addr
);
2236 rio_unmap_outb_region(mport
, map
->rioid
, map
->rio_addr
);
2242 static void mport_mm_open(struct vm_area_struct
*vma
)
2244 struct rio_mport_mapping
*map
= vma
->vm_private_data
;
2246 rmcd_debug(MMAP
, "%pad", &map
->phys_addr
);
2247 kref_get(&map
->ref
);
2250 static void mport_mm_close(struct vm_area_struct
*vma
)
2252 struct rio_mport_mapping
*map
= vma
->vm_private_data
;
2254 rmcd_debug(MMAP
, "%pad", &map
->phys_addr
);
2255 mutex_lock(&map
->md
->buf_mutex
);
2256 kref_put(&map
->ref
, mport_release_mapping
);
2257 mutex_unlock(&map
->md
->buf_mutex
);
2260 static const struct vm_operations_struct vm_ops
= {
2261 .open
= mport_mm_open
,
2262 .close
= mport_mm_close
,
2265 static int mport_cdev_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
2267 struct mport_cdev_priv
*priv
= filp
->private_data
;
2268 struct mport_dev
*md
;
2269 size_t size
= vma
->vm_end
- vma
->vm_start
;
2271 unsigned long offset
;
2273 struct rio_mport_mapping
*map
;
2275 rmcd_debug(MMAP
, "0x%x bytes at offset 0x%lx",
2276 (unsigned int)size
, vma
->vm_pgoff
);
2279 baddr
= ((dma_addr_t
)vma
->vm_pgoff
<< PAGE_SHIFT
);
2281 mutex_lock(&md
->buf_mutex
);
2282 list_for_each_entry(map
, &md
->mappings
, node
) {
2283 if (baddr
>= map
->phys_addr
&&
2284 baddr
< (map
->phys_addr
+ map
->size
)) {
2289 mutex_unlock(&md
->buf_mutex
);
2294 offset
= baddr
- map
->phys_addr
;
2296 if (size
+ offset
> map
->size
)
2299 vma
->vm_pgoff
= offset
>> PAGE_SHIFT
;
2300 rmcd_debug(MMAP
, "MMAP adjusted offset = 0x%lx", vma
->vm_pgoff
);
2302 if (map
->dir
== MAP_INBOUND
|| map
->dir
== MAP_DMA
)
2303 ret
= dma_mmap_coherent(md
->mport
->dev
.parent
, vma
,
2304 map
->virt_addr
, map
->phys_addr
, map
->size
);
2305 else if (map
->dir
== MAP_OUTBOUND
) {
2306 vma
->vm_page_prot
= pgprot_noncached(vma
->vm_page_prot
);
2307 ret
= vm_iomap_memory(vma
, map
->phys_addr
, map
->size
);
2309 rmcd_error("Attempt to mmap unsupported mapping type");
2314 vma
->vm_private_data
= map
;
2315 vma
->vm_ops
= &vm_ops
;
2318 rmcd_error("MMAP exit with err=%d", ret
);
2324 static unsigned int mport_cdev_poll(struct file
*filp
, poll_table
*wait
)
2326 struct mport_cdev_priv
*priv
= filp
->private_data
;
2328 poll_wait(filp
, &priv
->event_rx_wait
, wait
);
2329 if (kfifo_len(&priv
->event_fifo
))
2330 return POLLIN
| POLLRDNORM
;
2335 static ssize_t
mport_read(struct file
*filp
, char __user
*buf
, size_t count
,
2338 struct mport_cdev_priv
*priv
= filp
->private_data
;
2345 if (kfifo_is_empty(&priv
->event_fifo
) &&
2346 (filp
->f_flags
& O_NONBLOCK
))
2349 if (count
% sizeof(struct rio_event
))
2352 ret
= wait_event_interruptible(priv
->event_rx_wait
,
2353 kfifo_len(&priv
->event_fifo
) != 0);
2357 while (ret
< count
) {
2358 if (kfifo_to_user(&priv
->event_fifo
, buf
,
2359 sizeof(struct rio_event
), &copied
))
2368 static ssize_t
mport_write(struct file
*filp
, const char __user
*buf
,
2369 size_t count
, loff_t
*ppos
)
2371 struct mport_cdev_priv
*priv
= filp
->private_data
;
2372 struct rio_mport
*mport
= priv
->md
->mport
;
2373 struct rio_event event
;
2379 if (count
% sizeof(event
))
2383 while ((count
- len
) >= (int)sizeof(event
)) {
2384 if (copy_from_user(&event
, buf
, sizeof(event
)))
2387 if (event
.header
!= RIO_DOORBELL
)
2390 ret
= rio_mport_send_doorbell(mport
,
2391 event
.u
.doorbell
.rioid
,
2392 event
.u
.doorbell
.payload
);
2396 len
+= sizeof(event
);
2397 buf
+= sizeof(event
);
2403 static const struct file_operations mport_fops
= {
2404 .owner
= THIS_MODULE
,
2405 .open
= mport_cdev_open
,
2406 .release
= mport_cdev_release
,
2407 .poll
= mport_cdev_poll
,
2409 .write
= mport_write
,
2410 .mmap
= mport_cdev_mmap
,
2411 .fasync
= mport_cdev_fasync
,
2412 .unlocked_ioctl
= mport_cdev_ioctl
2416 * Character device management
2419 static void mport_device_release(struct device
*dev
)
2421 struct mport_dev
*md
;
2423 rmcd_debug(EXIT
, "%s", dev_name(dev
));
2424 md
= container_of(dev
, struct mport_dev
, dev
);
2429 * mport_cdev_add() - Create mport_dev from rio_mport
2430 * @mport: RapidIO master port
2432 static struct mport_dev
*mport_cdev_add(struct rio_mport
*mport
)
2435 struct mport_dev
*md
;
2436 struct rio_mport_attr attr
;
2438 md
= kzalloc(sizeof(*md
), GFP_KERNEL
);
2440 rmcd_error("Unable allocate a device object");
2445 mutex_init(&md
->buf_mutex
);
2446 mutex_init(&md
->file_mutex
);
2447 INIT_LIST_HEAD(&md
->file_list
);
2449 device_initialize(&md
->dev
);
2450 md
->dev
.devt
= MKDEV(MAJOR(dev_number
), mport
->id
);
2451 md
->dev
.class = dev_class
;
2452 md
->dev
.parent
= &mport
->dev
;
2453 md
->dev
.release
= mport_device_release
;
2454 dev_set_name(&md
->dev
, DEV_NAME
"%d", mport
->id
);
2455 atomic_set(&md
->active
, 1);
2457 cdev_init(&md
->cdev
, &mport_fops
);
2458 md
->cdev
.owner
= THIS_MODULE
;
2460 ret
= cdev_device_add(&md
->cdev
, &md
->dev
);
2462 rmcd_error("Failed to register mport %d (err=%d)",
2467 INIT_LIST_HEAD(&md
->doorbells
);
2468 spin_lock_init(&md
->db_lock
);
2469 INIT_LIST_HEAD(&md
->portwrites
);
2470 spin_lock_init(&md
->pw_lock
);
2471 INIT_LIST_HEAD(&md
->mappings
);
2473 md
->properties
.id
= mport
->id
;
2474 md
->properties
.sys_size
= mport
->sys_size
;
2475 md
->properties
.hdid
= mport
->host_deviceid
;
2476 md
->properties
.index
= mport
->index
;
2478 /* The transfer_mode property will be returned through mport query
2481 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2482 md
->properties
.transfer_mode
|= RIO_TRANSFER_MODE_MAPPED
;
2484 md
->properties
.transfer_mode
|= RIO_TRANSFER_MODE_TRANSFER
;
2486 ret
= rio_query_mport(mport
, &attr
);
2488 md
->properties
.flags
= attr
.flags
;
2489 md
->properties
.link_speed
= attr
.link_speed
;
2490 md
->properties
.link_width
= attr
.link_width
;
2491 md
->properties
.dma_max_sge
= attr
.dma_max_sge
;
2492 md
->properties
.dma_max_size
= attr
.dma_max_size
;
2493 md
->properties
.dma_align
= attr
.dma_align
;
2494 md
->properties
.cap_sys_size
= 0;
2495 md
->properties
.cap_transfer_mode
= 0;
2496 md
->properties
.cap_addr_size
= 0;
2498 pr_info(DRV_PREFIX
"Failed to obtain info for %s cdev(%d:%d)\n",
2499 mport
->name
, MAJOR(dev_number
), mport
->id
);
2501 mutex_lock(&mport_devs_lock
);
2502 list_add_tail(&md
->node
, &mport_devs
);
2503 mutex_unlock(&mport_devs_lock
);
2505 pr_info(DRV_PREFIX
"Added %s cdev(%d:%d)\n",
2506 mport
->name
, MAJOR(dev_number
), mport
->id
);
2511 put_device(&md
->dev
);
2516 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2517 * associated DMA channels.
2519 static void mport_cdev_terminate_dma(struct mport_dev
*md
)
2521 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2522 struct mport_cdev_priv
*client
;
2524 rmcd_debug(DMA
, "%s", dev_name(&md
->dev
));
2526 mutex_lock(&md
->file_mutex
);
2527 list_for_each_entry(client
, &md
->file_list
, list
) {
2528 if (client
->dmach
) {
2529 dmaengine_terminate_all(client
->dmach
);
2530 rio_release_dma(client
->dmach
);
2533 mutex_unlock(&md
->file_mutex
);
2536 dmaengine_terminate_all(md
->dma_chan
);
2537 rio_release_dma(md
->dma_chan
);
2538 md
->dma_chan
= NULL
;
2545 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2548 static int mport_cdev_kill_fasync(struct mport_dev
*md
)
2550 unsigned int files
= 0;
2551 struct mport_cdev_priv
*client
;
2553 mutex_lock(&md
->file_mutex
);
2554 list_for_each_entry(client
, &md
->file_list
, list
) {
2555 if (client
->async_queue
)
2556 kill_fasync(&client
->async_queue
, SIGIO
, POLL_HUP
);
2559 mutex_unlock(&md
->file_mutex
);
2564 * mport_cdev_remove() - Remove mport character device
2565 * @dev: Mport device to remove
2567 static void mport_cdev_remove(struct mport_dev
*md
)
2569 struct rio_mport_mapping
*map
, *_map
;
2571 rmcd_debug(EXIT
, "Remove %s cdev", md
->mport
->name
);
2572 atomic_set(&md
->active
, 0);
2573 mport_cdev_terminate_dma(md
);
2574 rio_del_mport_pw_handler(md
->mport
, md
, rio_mport_pw_handler
);
2575 cdev_device_del(&md
->cdev
, &md
->dev
);
2576 mport_cdev_kill_fasync(md
);
2578 flush_workqueue(dma_wq
);
2580 /* TODO: do we need to give clients some time to close file
2581 * descriptors? Simple wait for XX, or kref?
2585 * Release DMA buffers allocated for the mport device.
2586 * Disable associated inbound Rapidio requests mapping if applicable.
2588 mutex_lock(&md
->buf_mutex
);
2589 list_for_each_entry_safe(map
, _map
, &md
->mappings
, node
) {
2590 kref_put(&map
->ref
, mport_release_mapping
);
2592 mutex_unlock(&md
->buf_mutex
);
2594 if (!list_empty(&md
->mappings
))
2595 rmcd_warn("WARNING: %s pending mappings on removal",
2598 rio_release_inb_dbell(md
->mport
, 0, 0x0fff);
2600 put_device(&md
->dev
);
2604 * RIO rio_mport_interface driver
2608 * mport_add_mport() - Add rio_mport from LDM device struct
2609 * @dev: Linux device model struct
2610 * @class_intf: Linux class_interface
2612 static int mport_add_mport(struct device
*dev
,
2613 struct class_interface
*class_intf
)
2615 struct rio_mport
*mport
= NULL
;
2616 struct mport_dev
*chdev
= NULL
;
2618 mport
= to_rio_mport(dev
);
2622 chdev
= mport_cdev_add(mport
);
2630 * mport_remove_mport() - Remove rio_mport from global list
2631 * TODO remove device from global mport_dev list
2633 static void mport_remove_mport(struct device
*dev
,
2634 struct class_interface
*class_intf
)
2636 struct rio_mport
*mport
= NULL
;
2637 struct mport_dev
*chdev
;
2640 mport
= to_rio_mport(dev
);
2641 rmcd_debug(EXIT
, "Remove %s", mport
->name
);
2643 mutex_lock(&mport_devs_lock
);
2644 list_for_each_entry(chdev
, &mport_devs
, node
) {
2645 if (chdev
->mport
->id
== mport
->id
) {
2646 atomic_set(&chdev
->active
, 0);
2647 list_del(&chdev
->node
);
2652 mutex_unlock(&mport_devs_lock
);
2655 mport_cdev_remove(chdev
);
2658 /* the rio_mport_interface is used to handle local mport devices */
2659 static struct class_interface rio_mport_interface __refdata
= {
2660 .class = &rio_mport_class
,
2661 .add_dev
= mport_add_mport
,
2662 .remove_dev
= mport_remove_mport
,
2666 * Linux kernel module
2670 * mport_init - Driver module loading
2672 static int __init
mport_init(void)
2676 /* Create device class needed by udev */
2677 dev_class
= class_create(THIS_MODULE
, DRV_NAME
);
2678 if (IS_ERR(dev_class
)) {
2679 rmcd_error("Unable to create " DRV_NAME
" class");
2680 return PTR_ERR(dev_class
);
2683 ret
= alloc_chrdev_region(&dev_number
, 0, RIO_MAX_MPORTS
, DRV_NAME
);
2687 rmcd_debug(INIT
, "Registered class with major=%d", MAJOR(dev_number
));
2689 /* Register to rio_mport_interface */
2690 ret
= class_interface_register(&rio_mport_interface
);
2692 rmcd_error("class_interface_register() failed, err=%d", ret
);
2696 dma_wq
= create_singlethread_workqueue("dma_wq");
2698 rmcd_error("failed to create DMA work queue");
2706 class_interface_unregister(&rio_mport_interface
);
2708 unregister_chrdev_region(dev_number
, RIO_MAX_MPORTS
);
2710 class_destroy(dev_class
);
2715 * mport_exit - Driver module unloading
2717 static void __exit
mport_exit(void)
2719 class_interface_unregister(&rio_mport_interface
);
2720 class_destroy(dev_class
);
2721 unregister_chrdev_region(dev_number
, RIO_MAX_MPORTS
);
2722 destroy_workqueue(dma_wq
);
2725 module_init(mport_init
);
2726 module_exit(mport_exit
);