2 * This file is provided under a dual BSD/GPLv2 license. When using or
3 * redistributing this file, you may do so under either license.
7 * Copyright(c) 2012 Intel Corporation. All rights reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
15 * Copyright(c) 2012 Intel Corporation. All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
21 * * Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * * Redistributions in binary form must reproduce the above copy
24 * notice, this list of conditions and the following disclaimer in
25 * the documentation and/or other materials provided with the
27 * * Neither the name of Intel Corporation nor the names of its
28 * contributors may be used to endorse or promote products derived
29 * from this software without specific prior written permission.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
37 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
41 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 * Intel PCIe NTB Linux driver
45 * Contact Information:
46 * Jon Mason <jon.mason@intel.com>
48 #include <linux/debugfs.h>
49 #include <linux/init.h>
50 #include <linux/interrupt.h>
51 #include <linux/module.h>
52 #include <linux/pci.h>
53 #include <linux/slab.h>
57 #define NTB_NAME "Intel(R) PCI-E Non-Transparent Bridge Driver"
58 #define NTB_VER "0.25"
60 MODULE_DESCRIPTION(NTB_NAME
);
61 MODULE_VERSION(NTB_VER
);
62 MODULE_LICENSE("Dual BSD/GPL");
63 MODULE_AUTHOR("Intel Corporation");
65 static bool xeon_errata_workaround
= true;
66 module_param(xeon_errata_workaround
, bool, 0644);
67 MODULE_PARM_DESC(xeon_errata_workaround
, "Workaround for the Xeon Errata");
85 static struct dentry
*debugfs_dir
;
87 /* Translate memory window 0,1 to BAR 2,4 */
88 #define MW_TO_BAR(mw) (mw * NTB_MAX_NUM_MW + 2)
90 static DEFINE_PCI_DEVICE_TABLE(ntb_pci_tbl
) = {
91 {PCI_VDEVICE(INTEL
, PCI_DEVICE_ID_INTEL_NTB_B2B_BWD
)},
92 {PCI_VDEVICE(INTEL
, PCI_DEVICE_ID_INTEL_NTB_B2B_JSF
)},
93 {PCI_VDEVICE(INTEL
, PCI_DEVICE_ID_INTEL_NTB_CLASSIC_JSF
)},
94 {PCI_VDEVICE(INTEL
, PCI_DEVICE_ID_INTEL_NTB_RP_JSF
)},
95 {PCI_VDEVICE(INTEL
, PCI_DEVICE_ID_INTEL_NTB_RP_SNB
)},
96 {PCI_VDEVICE(INTEL
, PCI_DEVICE_ID_INTEL_NTB_B2B_SNB
)},
97 {PCI_VDEVICE(INTEL
, PCI_DEVICE_ID_INTEL_NTB_CLASSIC_SNB
)},
100 MODULE_DEVICE_TABLE(pci
, ntb_pci_tbl
);
103 * ntb_register_event_callback() - register event callback
104 * @ndev: pointer to ntb_device instance
105 * @func: callback function to register
107 * This function registers a callback for any HW driver events such as link
108 * up/down, power management notices and etc.
110 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
112 int ntb_register_event_callback(struct ntb_device
*ndev
,
113 void (*func
)(void *handle
, enum ntb_hw_event event
))
118 ndev
->event_cb
= func
;
124 * ntb_unregister_event_callback() - unregisters the event callback
125 * @ndev: pointer to ntb_device instance
127 * This function unregisters the existing callback from transport
129 void ntb_unregister_event_callback(struct ntb_device
*ndev
)
131 ndev
->event_cb
= NULL
;
135 * ntb_register_db_callback() - register a callback for doorbell interrupt
136 * @ndev: pointer to ntb_device instance
137 * @idx: doorbell index to register callback, zero based
138 * @func: callback function to register
140 * This function registers a callback function for the doorbell interrupt
141 * on the primary side. The function will unmask the doorbell as well to
144 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
146 int ntb_register_db_callback(struct ntb_device
*ndev
, unsigned int idx
,
147 void *data
, void (*func
)(void *data
, int db_num
))
151 if (idx
>= ndev
->max_cbs
|| ndev
->db_cb
[idx
].callback
) {
152 dev_warn(&ndev
->pdev
->dev
, "Invalid Index.\n");
156 ndev
->db_cb
[idx
].callback
= func
;
157 ndev
->db_cb
[idx
].data
= data
;
159 /* unmask interrupt */
160 mask
= readw(ndev
->reg_ofs
.pdb_mask
);
161 clear_bit(idx
* ndev
->bits_per_vector
, &mask
);
162 writew(mask
, ndev
->reg_ofs
.pdb_mask
);
168 * ntb_unregister_db_callback() - unregister a callback for doorbell interrupt
169 * @ndev: pointer to ntb_device instance
170 * @idx: doorbell index to register callback, zero based
172 * This function unregisters a callback function for the doorbell interrupt
173 * on the primary side. The function will also mask the said doorbell.
175 void ntb_unregister_db_callback(struct ntb_device
*ndev
, unsigned int idx
)
179 if (idx
>= ndev
->max_cbs
|| !ndev
->db_cb
[idx
].callback
)
182 mask
= readw(ndev
->reg_ofs
.pdb_mask
);
183 set_bit(idx
* ndev
->bits_per_vector
, &mask
);
184 writew(mask
, ndev
->reg_ofs
.pdb_mask
);
186 ndev
->db_cb
[idx
].callback
= NULL
;
190 * ntb_find_transport() - find the transport pointer
191 * @transport: pointer to pci device
193 * Given the pci device pointer, return the transport pointer passed in when
194 * the transport attached when it was inited.
196 * RETURNS: pointer to transport.
198 void *ntb_find_transport(struct pci_dev
*pdev
)
200 struct ntb_device
*ndev
= pci_get_drvdata(pdev
);
201 return ndev
->ntb_transport
;
205 * ntb_register_transport() - Register NTB transport with NTB HW driver
206 * @transport: transport identifier
208 * This function allows a transport to reserve the hardware driver for
211 * RETURNS: pointer to ntb_device, NULL on error.
213 struct ntb_device
*ntb_register_transport(struct pci_dev
*pdev
, void *transport
)
215 struct ntb_device
*ndev
= pci_get_drvdata(pdev
);
217 if (ndev
->ntb_transport
)
220 ndev
->ntb_transport
= transport
;
225 * ntb_unregister_transport() - Unregister the transport with the NTB HW driver
226 * @ndev - ntb_device of the transport to be freed
228 * This function unregisters the transport from the HW driver and performs any
229 * necessary cleanups.
231 void ntb_unregister_transport(struct ntb_device
*ndev
)
235 if (!ndev
->ntb_transport
)
238 for (i
= 0; i
< ndev
->max_cbs
; i
++)
239 ntb_unregister_db_callback(ndev
, i
);
241 ntb_unregister_event_callback(ndev
);
242 ndev
->ntb_transport
= NULL
;
246 * ntb_write_local_spad() - write to the secondary scratchpad register
247 * @ndev: pointer to ntb_device instance
248 * @idx: index to the scratchpad register, 0 based
249 * @val: the data value to put into the register
251 * This function allows writing of a 32bit value to the indexed scratchpad
252 * register. This writes over the data mirrored to the local scratchpad register
253 * by the remote system.
255 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
257 int ntb_write_local_spad(struct ntb_device
*ndev
, unsigned int idx
, u32 val
)
259 if (idx
>= ndev
->limits
.max_spads
)
262 dev_dbg(&ndev
->pdev
->dev
, "Writing %x to local scratch pad index %d\n",
264 writel(val
, ndev
->reg_ofs
.spad_read
+ idx
* 4);
270 * ntb_read_local_spad() - read from the primary scratchpad register
271 * @ndev: pointer to ntb_device instance
272 * @idx: index to scratchpad register, 0 based
273 * @val: pointer to 32bit integer for storing the register value
275 * This function allows reading of the 32bit scratchpad register on
276 * the primary (internal) side. This allows the local system to read data
277 * written and mirrored to the scratchpad register by the remote system.
279 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
281 int ntb_read_local_spad(struct ntb_device
*ndev
, unsigned int idx
, u32
*val
)
283 if (idx
>= ndev
->limits
.max_spads
)
286 *val
= readl(ndev
->reg_ofs
.spad_write
+ idx
* 4);
287 dev_dbg(&ndev
->pdev
->dev
,
288 "Reading %x from local scratch pad index %d\n", *val
, idx
);
294 * ntb_write_remote_spad() - write to the secondary scratchpad register
295 * @ndev: pointer to ntb_device instance
296 * @idx: index to the scratchpad register, 0 based
297 * @val: the data value to put into the register
299 * This function allows writing of a 32bit value to the indexed scratchpad
300 * register. The register resides on the secondary (external) side. This allows
301 * the local system to write data to be mirrored to the remote systems
302 * scratchpad register.
304 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
306 int ntb_write_remote_spad(struct ntb_device
*ndev
, unsigned int idx
, u32 val
)
308 if (idx
>= ndev
->limits
.max_spads
)
311 dev_dbg(&ndev
->pdev
->dev
, "Writing %x to remote scratch pad index %d\n",
313 writel(val
, ndev
->reg_ofs
.spad_write
+ idx
* 4);
319 * ntb_read_remote_spad() - read from the primary scratchpad register
320 * @ndev: pointer to ntb_device instance
321 * @idx: index to scratchpad register, 0 based
322 * @val: pointer to 32bit integer for storing the register value
324 * This function allows reading of the 32bit scratchpad register on
325 * the primary (internal) side. This alloows the local system to read the data
326 * it wrote to be mirrored on the remote system.
328 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
330 int ntb_read_remote_spad(struct ntb_device
*ndev
, unsigned int idx
, u32
*val
)
332 if (idx
>= ndev
->limits
.max_spads
)
335 *val
= readl(ndev
->reg_ofs
.spad_read
+ idx
* 4);
336 dev_dbg(&ndev
->pdev
->dev
,
337 "Reading %x from remote scratch pad index %d\n", *val
, idx
);
343 * ntb_get_mw_vbase() - get virtual addr for the NTB memory window
344 * @ndev: pointer to ntb_device instance
345 * @mw: memory window number
347 * This function provides the base virtual address of the memory window
350 * RETURNS: pointer to virtual address, or NULL on error.
352 void __iomem
*ntb_get_mw_vbase(struct ntb_device
*ndev
, unsigned int mw
)
354 if (mw
>= ntb_max_mw(ndev
))
357 return ndev
->mw
[mw
].vbase
;
361 * ntb_get_mw_size() - return size of NTB memory window
362 * @ndev: pointer to ntb_device instance
363 * @mw: memory window number
365 * This function provides the physical size of the memory window specified
367 * RETURNS: the size of the memory window or zero on error
369 resource_size_t
ntb_get_mw_size(struct ntb_device
*ndev
, unsigned int mw
)
371 if (mw
>= ntb_max_mw(ndev
))
374 return ndev
->mw
[mw
].bar_sz
;
378 * ntb_set_mw_addr - set the memory window address
379 * @ndev: pointer to ntb_device instance
380 * @mw: memory window number
381 * @addr: base address for data
383 * This function sets the base physical address of the memory window. This
384 * memory address is where data from the remote system will be transfered into
385 * or out of depending on how the transport is configured.
387 void ntb_set_mw_addr(struct ntb_device
*ndev
, unsigned int mw
, u64 addr
)
389 if (mw
>= ntb_max_mw(ndev
))
392 dev_dbg(&ndev
->pdev
->dev
, "Writing addr %Lx to BAR %d\n", addr
,
395 ndev
->mw
[mw
].phys_addr
= addr
;
397 switch (MW_TO_BAR(mw
)) {
399 writeq(addr
, ndev
->reg_ofs
.sbar2_xlat
);
402 writeq(addr
, ndev
->reg_ofs
.sbar4_xlat
);
408 * ntb_ring_sdb() - Set the doorbell on the secondary/external side
409 * @ndev: pointer to ntb_device instance
410 * @db: doorbell to ring
412 * This function allows triggering of a doorbell on the secondary/external
413 * side that will initiate an interrupt on the remote host
415 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
417 void ntb_ring_sdb(struct ntb_device
*ndev
, unsigned int db
)
419 dev_dbg(&ndev
->pdev
->dev
, "%s: ringing doorbell %d\n", __func__
, db
);
421 if (ndev
->hw_type
== BWD_HW
)
422 writeq((u64
) 1 << db
, ndev
->reg_ofs
.sdb
);
424 writew(((1 << ndev
->bits_per_vector
) - 1) <<
425 (db
* ndev
->bits_per_vector
), ndev
->reg_ofs
.sdb
);
428 static void ntb_link_event(struct ntb_device
*ndev
, int link_state
)
432 if (ndev
->link_status
== link_state
)
435 if (link_state
== NTB_LINK_UP
) {
438 dev_info(&ndev
->pdev
->dev
, "Link Up\n");
439 ndev
->link_status
= NTB_LINK_UP
;
440 event
= NTB_EVENT_HW_LINK_UP
;
442 if (ndev
->hw_type
== BWD_HW
)
443 status
= readw(ndev
->reg_ofs
.lnk_stat
);
445 int rc
= pci_read_config_word(ndev
->pdev
,
446 SNB_LINK_STATUS_OFFSET
,
451 dev_info(&ndev
->pdev
->dev
, "Link Width %d, Link Speed %d\n",
452 (status
& NTB_LINK_WIDTH_MASK
) >> 4,
453 (status
& NTB_LINK_SPEED_MASK
));
455 dev_info(&ndev
->pdev
->dev
, "Link Down\n");
456 ndev
->link_status
= NTB_LINK_DOWN
;
457 event
= NTB_EVENT_HW_LINK_DOWN
;
460 /* notify the upper layer if we have an event change */
462 ndev
->event_cb(ndev
->ntb_transport
, event
);
465 static int ntb_link_status(struct ntb_device
*ndev
)
469 if (ndev
->hw_type
== BWD_HW
) {
472 ntb_cntl
= readl(ndev
->reg_ofs
.lnk_cntl
);
473 if (ntb_cntl
& BWD_CNTL_LINK_DOWN
)
474 link_state
= NTB_LINK_DOWN
;
476 link_state
= NTB_LINK_UP
;
481 rc
= pci_read_config_word(ndev
->pdev
, SNB_LINK_STATUS_OFFSET
,
486 if (status
& NTB_LINK_STATUS_ACTIVE
)
487 link_state
= NTB_LINK_UP
;
489 link_state
= NTB_LINK_DOWN
;
492 ntb_link_event(ndev
, link_state
);
497 /* BWD doesn't have link status interrupt, poll on that platform */
498 static void bwd_link_poll(struct work_struct
*work
)
500 struct ntb_device
*ndev
= container_of(work
, struct ntb_device
,
502 unsigned long ts
= jiffies
;
504 /* If we haven't gotten an interrupt in a while, check the BWD link
507 if (ts
> ndev
->last_ts
+ NTB_HB_TIMEOUT
) {
508 int rc
= ntb_link_status(ndev
);
510 dev_err(&ndev
->pdev
->dev
,
511 "Error determining link status\n");
514 schedule_delayed_work(&ndev
->hb_timer
, NTB_HB_TIMEOUT
);
517 static int ntb_xeon_setup(struct ntb_device
*ndev
)
522 ndev
->hw_type
= SNB_HW
;
524 rc
= pci_read_config_byte(ndev
->pdev
, NTB_PPD_OFFSET
, &val
);
528 switch (val
& SNB_PPD_CONN_TYPE
) {
530 ndev
->conn_type
= NTB_CONN_B2B
;
532 case NTB_CONN_CLASSIC
:
535 dev_err(&ndev
->pdev
->dev
, "Only B2B supported at this time\n");
539 if (val
& SNB_PPD_DEV_TYPE
)
540 ndev
->dev_type
= NTB_DEV_USD
;
542 ndev
->dev_type
= NTB_DEV_DSD
;
544 ndev
->reg_ofs
.pdb
= ndev
->reg_base
+ SNB_PDOORBELL_OFFSET
;
545 ndev
->reg_ofs
.pdb_mask
= ndev
->reg_base
+ SNB_PDBMSK_OFFSET
;
546 ndev
->reg_ofs
.sbar2_xlat
= ndev
->reg_base
+ SNB_SBAR2XLAT_OFFSET
;
547 ndev
->reg_ofs
.sbar4_xlat
= ndev
->reg_base
+ SNB_SBAR4XLAT_OFFSET
;
548 ndev
->reg_ofs
.lnk_cntl
= ndev
->reg_base
+ SNB_NTBCNTL_OFFSET
;
549 ndev
->reg_ofs
.lnk_stat
= ndev
->reg_base
+ SNB_LINK_STATUS_OFFSET
;
550 ndev
->reg_ofs
.spad_read
= ndev
->reg_base
+ SNB_SPAD_OFFSET
;
551 ndev
->reg_ofs
.spci_cmd
= ndev
->reg_base
+ SNB_PCICMD_OFFSET
;
553 /* There is a Xeon hardware errata related to writes to
554 * SDOORBELL or B2BDOORBELL in conjunction with inbound access
555 * to NTB MMIO Space, which may hang the system. To workaround
556 * this use the second memory window to access the interrupt and
557 * scratch pad registers on the remote system.
559 if (xeon_errata_workaround
) {
560 if (!ndev
->mw
[1].bar_sz
)
563 ndev
->limits
.max_mw
= SNB_ERRATA_MAX_MW
;
564 ndev
->reg_ofs
.spad_write
= ndev
->mw
[1].vbase
+
566 ndev
->reg_ofs
.sdb
= ndev
->mw
[1].vbase
+
567 SNB_PDOORBELL_OFFSET
;
569 /* Set the Limit register to 4k, the minimum size, to
570 * prevent an illegal access
572 writeq(ndev
->mw
[1].bar_sz
+ 0x1000, ndev
->reg_base
+
573 SNB_PBAR4LMT_OFFSET
);
575 ndev
->limits
.max_mw
= SNB_MAX_MW
;
576 ndev
->reg_ofs
.spad_write
= ndev
->reg_base
+
578 ndev
->reg_ofs
.sdb
= ndev
->reg_base
+
579 SNB_B2B_DOORBELL_OFFSET
;
581 /* Disable the Limit register, just incase it is set to
584 writeq(0, ndev
->reg_base
+ SNB_PBAR4LMT_OFFSET
);
587 /* The Xeon errata workaround requires setting SBAR Base
588 * addresses to known values, so that the PBAR XLAT can be
589 * pointed at SBAR0 of the remote system.
591 if (ndev
->dev_type
== NTB_DEV_USD
) {
592 writeq(SNB_MBAR23_DSD_ADDR
, ndev
->reg_base
+
593 SNB_PBAR2XLAT_OFFSET
);
594 if (xeon_errata_workaround
)
595 writeq(SNB_MBAR01_DSD_ADDR
, ndev
->reg_base
+
596 SNB_PBAR4XLAT_OFFSET
);
598 writeq(SNB_MBAR45_DSD_ADDR
, ndev
->reg_base
+
599 SNB_PBAR4XLAT_OFFSET
);
600 /* B2B_XLAT_OFFSET is a 64bit register, but can
601 * only take 32bit writes
603 writel(SNB_MBAR01_USD_ADDR
& 0xffffffff,
604 ndev
->reg_base
+ SNB_B2B_XLAT_OFFSETL
);
605 writel(SNB_MBAR01_DSD_ADDR
>> 32,
606 ndev
->reg_base
+ SNB_B2B_XLAT_OFFSETU
);
609 writeq(SNB_MBAR01_USD_ADDR
, ndev
->reg_base
+
610 SNB_SBAR0BASE_OFFSET
);
611 writeq(SNB_MBAR23_USD_ADDR
, ndev
->reg_base
+
612 SNB_SBAR2BASE_OFFSET
);
613 writeq(SNB_MBAR45_USD_ADDR
, ndev
->reg_base
+
614 SNB_SBAR4BASE_OFFSET
);
616 writeq(SNB_MBAR23_USD_ADDR
, ndev
->reg_base
+
617 SNB_PBAR2XLAT_OFFSET
);
618 if (xeon_errata_workaround
)
619 writeq(SNB_MBAR01_USD_ADDR
, ndev
->reg_base
+
620 SNB_PBAR4XLAT_OFFSET
);
622 writeq(SNB_MBAR45_USD_ADDR
, ndev
->reg_base
+
623 SNB_PBAR4XLAT_OFFSET
);
624 /* B2B_XLAT_OFFSET is a 64bit register, but can
625 * only take 32bit writes
627 writel(SNB_MBAR01_USD_ADDR
& 0xffffffff,
628 ndev
->reg_base
+ SNB_B2B_XLAT_OFFSETL
);
629 writel(SNB_MBAR01_USD_ADDR
>> 32,
630 ndev
->reg_base
+ SNB_B2B_XLAT_OFFSETU
);
632 writeq(SNB_MBAR01_DSD_ADDR
, ndev
->reg_base
+
633 SNB_SBAR0BASE_OFFSET
);
634 writeq(SNB_MBAR23_DSD_ADDR
, ndev
->reg_base
+
635 SNB_SBAR2BASE_OFFSET
);
636 writeq(SNB_MBAR45_DSD_ADDR
, ndev
->reg_base
+
637 SNB_SBAR4BASE_OFFSET
);
640 ndev
->limits
.max_spads
= SNB_MAX_B2B_SPADS
;
641 ndev
->limits
.max_db_bits
= SNB_MAX_DB_BITS
;
642 ndev
->limits
.msix_cnt
= SNB_MSIX_CNT
;
643 ndev
->bits_per_vector
= SNB_DB_BITS_PER_VEC
;
648 static int ntb_bwd_setup(struct ntb_device
*ndev
)
653 ndev
->hw_type
= BWD_HW
;
655 rc
= pci_read_config_dword(ndev
->pdev
, NTB_PPD_OFFSET
, &val
);
659 switch ((val
& BWD_PPD_CONN_TYPE
) >> 8) {
661 ndev
->conn_type
= NTB_CONN_B2B
;
665 dev_err(&ndev
->pdev
->dev
, "Only B2B supported at this time\n");
669 if (val
& BWD_PPD_DEV_TYPE
)
670 ndev
->dev_type
= NTB_DEV_DSD
;
672 ndev
->dev_type
= NTB_DEV_USD
;
674 /* Initiate PCI-E link training */
675 rc
= pci_write_config_dword(ndev
->pdev
, NTB_PPD_OFFSET
,
676 val
| BWD_PPD_INIT_LINK
);
680 ndev
->reg_ofs
.pdb
= ndev
->reg_base
+ BWD_PDOORBELL_OFFSET
;
681 ndev
->reg_ofs
.pdb_mask
= ndev
->reg_base
+ BWD_PDBMSK_OFFSET
;
682 ndev
->reg_ofs
.sbar2_xlat
= ndev
->reg_base
+ BWD_SBAR2XLAT_OFFSET
;
683 ndev
->reg_ofs
.sbar4_xlat
= ndev
->reg_base
+ BWD_SBAR4XLAT_OFFSET
;
684 ndev
->reg_ofs
.lnk_cntl
= ndev
->reg_base
+ BWD_NTBCNTL_OFFSET
;
685 ndev
->reg_ofs
.lnk_stat
= ndev
->reg_base
+ BWD_LINK_STATUS_OFFSET
;
686 ndev
->reg_ofs
.spad_read
= ndev
->reg_base
+ BWD_SPAD_OFFSET
;
687 ndev
->reg_ofs
.spci_cmd
= ndev
->reg_base
+ BWD_PCICMD_OFFSET
;
689 if (ndev
->conn_type
== NTB_CONN_B2B
) {
690 ndev
->reg_ofs
.sdb
= ndev
->reg_base
+ BWD_B2B_DOORBELL_OFFSET
;
691 ndev
->reg_ofs
.spad_write
= ndev
->reg_base
+ BWD_B2B_SPAD_OFFSET
;
692 ndev
->limits
.max_spads
= BWD_MAX_SPADS
;
694 ndev
->reg_ofs
.sdb
= ndev
->reg_base
+ BWD_PDOORBELL_OFFSET
;
695 ndev
->reg_ofs
.spad_write
= ndev
->reg_base
+ BWD_SPAD_OFFSET
;
696 ndev
->limits
.max_spads
= BWD_MAX_COMPAT_SPADS
;
699 ndev
->limits
.max_mw
= BWD_MAX_MW
;
700 ndev
->limits
.max_db_bits
= BWD_MAX_DB_BITS
;
701 ndev
->limits
.msix_cnt
= BWD_MSIX_CNT
;
702 ndev
->bits_per_vector
= BWD_DB_BITS_PER_VEC
;
704 /* Since bwd doesn't have a link interrupt, setup a poll timer */
705 INIT_DELAYED_WORK(&ndev
->hb_timer
, bwd_link_poll
);
706 schedule_delayed_work(&ndev
->hb_timer
, NTB_HB_TIMEOUT
);
711 static int ntb_device_setup(struct ntb_device
*ndev
)
715 switch (ndev
->pdev
->device
) {
716 case PCI_DEVICE_ID_INTEL_NTB_2ND_SNB
:
717 case PCI_DEVICE_ID_INTEL_NTB_RP_JSF
:
718 case PCI_DEVICE_ID_INTEL_NTB_RP_SNB
:
719 case PCI_DEVICE_ID_INTEL_NTB_CLASSIC_JSF
:
720 case PCI_DEVICE_ID_INTEL_NTB_CLASSIC_SNB
:
721 case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF
:
722 case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB
:
723 rc
= ntb_xeon_setup(ndev
);
725 case PCI_DEVICE_ID_INTEL_NTB_B2B_BWD
:
726 rc
= ntb_bwd_setup(ndev
);
735 dev_info(&ndev
->pdev
->dev
, "Device Type = %s\n",
736 ndev
->dev_type
== NTB_DEV_USD
? "USD/DSP" : "DSD/USP");
738 /* Enable Bus Master and Memory Space on the secondary side */
739 writew(PCI_COMMAND_MEMORY
| PCI_COMMAND_MASTER
, ndev
->reg_ofs
.spci_cmd
);
744 static void ntb_device_free(struct ntb_device
*ndev
)
746 if (ndev
->hw_type
== BWD_HW
)
747 cancel_delayed_work_sync(&ndev
->hb_timer
);
750 static irqreturn_t
bwd_callback_msix_irq(int irq
, void *data
)
752 struct ntb_db_cb
*db_cb
= data
;
753 struct ntb_device
*ndev
= db_cb
->ndev
;
755 dev_dbg(&ndev
->pdev
->dev
, "MSI-X irq %d received for DB %d\n", irq
,
759 db_cb
->callback(db_cb
->data
, db_cb
->db_num
);
761 /* No need to check for the specific HB irq, any interrupt means
764 ndev
->last_ts
= jiffies
;
766 writeq((u64
) 1 << db_cb
->db_num
, ndev
->reg_ofs
.pdb
);
771 static irqreturn_t
xeon_callback_msix_irq(int irq
, void *data
)
773 struct ntb_db_cb
*db_cb
= data
;
774 struct ntb_device
*ndev
= db_cb
->ndev
;
776 dev_dbg(&ndev
->pdev
->dev
, "MSI-X irq %d received for DB %d\n", irq
,
780 db_cb
->callback(db_cb
->data
, db_cb
->db_num
);
782 /* On Sandybridge, there are 16 bits in the interrupt register
783 * but only 4 vectors. So, 5 bits are assigned to the first 3
784 * vectors, with the 4th having a single bit for link
787 writew(((1 << ndev
->bits_per_vector
) - 1) <<
788 (db_cb
->db_num
* ndev
->bits_per_vector
), ndev
->reg_ofs
.pdb
);
793 /* Since we do not have a HW doorbell in BWD, this is only used in JF/JT */
794 static irqreturn_t
xeon_event_msix_irq(int irq
, void *dev
)
796 struct ntb_device
*ndev
= dev
;
799 dev_dbg(&ndev
->pdev
->dev
, "MSI-X irq %d received for Events\n", irq
);
801 rc
= ntb_link_status(ndev
);
803 dev_err(&ndev
->pdev
->dev
, "Error determining link status\n");
805 /* bit 15 is always the link bit */
806 writew(1 << ndev
->limits
.max_db_bits
, ndev
->reg_ofs
.pdb
);
811 static irqreturn_t
ntb_interrupt(int irq
, void *dev
)
813 struct ntb_device
*ndev
= dev
;
816 if (ndev
->hw_type
== BWD_HW
) {
817 u64 pdb
= readq(ndev
->reg_ofs
.pdb
);
819 dev_dbg(&ndev
->pdev
->dev
, "irq %d - pdb = %Lx\n", irq
, pdb
);
824 bwd_callback_msix_irq(irq
, &ndev
->db_cb
[i
]);
827 u16 pdb
= readw(ndev
->reg_ofs
.pdb
);
829 dev_dbg(&ndev
->pdev
->dev
, "irq %d - pdb = %x sdb %x\n", irq
,
830 pdb
, readw(ndev
->reg_ofs
.sdb
));
832 if (pdb
& SNB_DB_HW_LINK
) {
833 xeon_event_msix_irq(irq
, dev
);
834 pdb
&= ~SNB_DB_HW_LINK
;
840 xeon_callback_msix_irq(irq
, &ndev
->db_cb
[i
]);
847 static int ntb_setup_msix(struct ntb_device
*ndev
)
849 struct pci_dev
*pdev
= ndev
->pdev
;
850 struct msix_entry
*msix
;
855 pos
= pci_find_capability(pdev
, PCI_CAP_ID_MSIX
);
861 rc
= pci_read_config_word(pdev
, pos
+ PCI_MSIX_FLAGS
, &val
);
865 msix_entries
= msix_table_size(val
);
866 if (msix_entries
> ndev
->limits
.msix_cnt
) {
871 ndev
->msix_entries
= kmalloc(sizeof(struct msix_entry
) * msix_entries
,
873 if (!ndev
->msix_entries
) {
878 for (i
= 0; i
< msix_entries
; i
++)
879 ndev
->msix_entries
[i
].entry
= i
;
881 rc
= pci_enable_msix(pdev
, ndev
->msix_entries
, msix_entries
);
885 /* On SNB, the link interrupt is always tied to 4th vector. If
886 * we can't get all 4, then we can't use MSI-X.
888 if (ndev
->hw_type
!= BWD_HW
) {
894 "Only %d MSI-X vectors. Limiting the number of queues to that number.\n",
899 for (i
= 0; i
< msix_entries
; i
++) {
900 msix
= &ndev
->msix_entries
[i
];
901 WARN_ON(!msix
->vector
);
903 /* Use the last MSI-X vector for Link status */
904 if (ndev
->hw_type
== BWD_HW
) {
905 rc
= request_irq(msix
->vector
, bwd_callback_msix_irq
, 0,
906 "ntb-callback-msix", &ndev
->db_cb
[i
]);
910 if (i
== msix_entries
- 1) {
911 rc
= request_irq(msix
->vector
,
912 xeon_event_msix_irq
, 0,
913 "ntb-event-msix", ndev
);
917 rc
= request_irq(msix
->vector
,
918 xeon_callback_msix_irq
, 0,
927 ndev
->num_msix
= msix_entries
;
928 if (ndev
->hw_type
== BWD_HW
)
929 ndev
->max_cbs
= msix_entries
;
931 ndev
->max_cbs
= msix_entries
- 1;
937 msix
= &ndev
->msix_entries
[i
];
938 if (ndev
->hw_type
!= BWD_HW
&& i
== ndev
->num_msix
- 1)
939 free_irq(msix
->vector
, ndev
);
941 free_irq(msix
->vector
, &ndev
->db_cb
[i
]);
943 pci_disable_msix(pdev
);
945 kfree(ndev
->msix_entries
);
946 dev_err(&pdev
->dev
, "Error allocating MSI-X interrupt\n");
952 static int ntb_setup_msi(struct ntb_device
*ndev
)
954 struct pci_dev
*pdev
= ndev
->pdev
;
957 rc
= pci_enable_msi(pdev
);
961 rc
= request_irq(pdev
->irq
, ntb_interrupt
, 0, "ntb-msi", ndev
);
963 pci_disable_msi(pdev
);
964 dev_err(&pdev
->dev
, "Error allocating MSI interrupt\n");
971 static int ntb_setup_intx(struct ntb_device
*ndev
)
973 struct pci_dev
*pdev
= ndev
->pdev
;
978 /* Verify intx is enabled */
981 rc
= request_irq(pdev
->irq
, ntb_interrupt
, IRQF_SHARED
, "ntb-intx",
989 static int ntb_setup_interrupts(struct ntb_device
*ndev
)
993 /* On BWD, disable all interrupts. On SNB, disable all but Link
994 * Interrupt. The rest will be unmasked as callbacks are registered.
996 if (ndev
->hw_type
== BWD_HW
)
997 writeq(~0, ndev
->reg_ofs
.pdb_mask
);
999 writew(~(1 << ndev
->limits
.max_db_bits
),
1000 ndev
->reg_ofs
.pdb_mask
);
1002 rc
= ntb_setup_msix(ndev
);
1006 ndev
->bits_per_vector
= 1;
1007 ndev
->max_cbs
= ndev
->limits
.max_db_bits
;
1009 rc
= ntb_setup_msi(ndev
);
1013 rc
= ntb_setup_intx(ndev
);
1015 dev_err(&ndev
->pdev
->dev
, "no usable interrupts\n");
1023 static void ntb_free_interrupts(struct ntb_device
*ndev
)
1025 struct pci_dev
*pdev
= ndev
->pdev
;
1027 /* mask interrupts */
1028 if (ndev
->hw_type
== BWD_HW
)
1029 writeq(~0, ndev
->reg_ofs
.pdb_mask
);
1031 writew(~0, ndev
->reg_ofs
.pdb_mask
);
1033 if (ndev
->num_msix
) {
1034 struct msix_entry
*msix
;
1037 for (i
= 0; i
< ndev
->num_msix
; i
++) {
1038 msix
= &ndev
->msix_entries
[i
];
1039 if (ndev
->hw_type
!= BWD_HW
&& i
== ndev
->num_msix
- 1)
1040 free_irq(msix
->vector
, ndev
);
1042 free_irq(msix
->vector
, &ndev
->db_cb
[i
]);
1044 pci_disable_msix(pdev
);
1046 free_irq(pdev
->irq
, ndev
);
1048 if (pci_dev_msi_enabled(pdev
))
1049 pci_disable_msi(pdev
);
1053 static int ntb_create_callbacks(struct ntb_device
*ndev
)
1057 /* Checken-egg issue. We won't know how many callbacks are necessary
1058 * until we see how many MSI-X vectors we get, but these pointers need
1059 * to be passed into the MSI-X register fucntion. So, we allocate the
1060 * max, knowing that they might not all be used, to work around this.
1062 ndev
->db_cb
= kcalloc(ndev
->limits
.max_db_bits
,
1063 sizeof(struct ntb_db_cb
),
1068 for (i
= 0; i
< ndev
->limits
.max_db_bits
; i
++) {
1069 ndev
->db_cb
[i
].db_num
= i
;
1070 ndev
->db_cb
[i
].ndev
= ndev
;
1076 static void ntb_free_callbacks(struct ntb_device
*ndev
)
1080 for (i
= 0; i
< ndev
->limits
.max_db_bits
; i
++)
1081 ntb_unregister_db_callback(ndev
, i
);
1086 static void ntb_setup_debugfs(struct ntb_device
*ndev
)
1088 if (!debugfs_initialized())
1092 debugfs_dir
= debugfs_create_dir(KBUILD_MODNAME
, NULL
);
1094 ndev
->debugfs_dir
= debugfs_create_dir(pci_name(ndev
->pdev
),
1098 static void ntb_free_debugfs(struct ntb_device
*ndev
)
1100 debugfs_remove_recursive(ndev
->debugfs_dir
);
1102 if (debugfs_dir
&& simple_empty(debugfs_dir
)) {
1103 debugfs_remove_recursive(debugfs_dir
);
1108 static int ntb_pci_probe(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
1110 struct ntb_device
*ndev
;
1113 ndev
= kzalloc(sizeof(struct ntb_device
), GFP_KERNEL
);
1118 ndev
->link_status
= NTB_LINK_DOWN
;
1119 pci_set_drvdata(pdev
, ndev
);
1120 ntb_setup_debugfs(ndev
);
1122 rc
= pci_enable_device(pdev
);
1126 pci_set_master(ndev
->pdev
);
1128 rc
= pci_request_selected_regions(pdev
, NTB_BAR_MASK
, KBUILD_MODNAME
);
1132 ndev
->reg_base
= pci_ioremap_bar(pdev
, NTB_BAR_MMIO
);
1133 if (!ndev
->reg_base
) {
1134 dev_warn(&pdev
->dev
, "Cannot remap BAR 0\n");
1139 for (i
= 0; i
< NTB_MAX_NUM_MW
; i
++) {
1140 ndev
->mw
[i
].bar_sz
= pci_resource_len(pdev
, MW_TO_BAR(i
));
1142 ioremap_wc(pci_resource_start(pdev
, MW_TO_BAR(i
)),
1143 ndev
->mw
[i
].bar_sz
);
1144 dev_info(&pdev
->dev
, "MW %d size %llu\n", i
,
1145 pci_resource_len(pdev
, MW_TO_BAR(i
)));
1146 if (!ndev
->mw
[i
].vbase
) {
1147 dev_warn(&pdev
->dev
, "Cannot remap BAR %d\n",
1154 rc
= pci_set_dma_mask(pdev
, DMA_BIT_MASK(64));
1156 rc
= pci_set_dma_mask(pdev
, DMA_BIT_MASK(32));
1160 dev_warn(&pdev
->dev
, "Cannot DMA highmem\n");
1163 rc
= pci_set_consistent_dma_mask(pdev
, DMA_BIT_MASK(64));
1165 rc
= pci_set_consistent_dma_mask(pdev
, DMA_BIT_MASK(32));
1169 dev_warn(&pdev
->dev
, "Cannot DMA consistent highmem\n");
1172 rc
= ntb_device_setup(ndev
);
1176 rc
= ntb_create_callbacks(ndev
);
1180 rc
= ntb_setup_interrupts(ndev
);
1184 /* The scratchpad registers keep the values between rmmod/insmod,
1187 for (i
= 0; i
< ndev
->limits
.max_spads
; i
++) {
1188 ntb_write_local_spad(ndev
, i
, 0);
1189 ntb_write_remote_spad(ndev
, i
, 0);
1192 rc
= ntb_transport_init(pdev
);
1196 /* Let's bring the NTB link up */
1197 writel(NTB_CNTL_BAR23_SNOOP
| NTB_CNTL_BAR45_SNOOP
,
1198 ndev
->reg_ofs
.lnk_cntl
);
1203 ntb_free_interrupts(ndev
);
1205 ntb_free_callbacks(ndev
);
1207 ntb_device_free(ndev
);
1209 for (i
--; i
>= 0; i
--)
1210 iounmap(ndev
->mw
[i
].vbase
);
1211 iounmap(ndev
->reg_base
);
1213 pci_release_selected_regions(pdev
, NTB_BAR_MASK
);
1215 pci_disable_device(pdev
);
1217 ntb_free_debugfs(ndev
);
1220 dev_err(&pdev
->dev
, "Error loading %s module\n", KBUILD_MODNAME
);
1224 static void ntb_pci_remove(struct pci_dev
*pdev
)
1226 struct ntb_device
*ndev
= pci_get_drvdata(pdev
);
1230 /* Bring NTB link down */
1231 ntb_cntl
= readl(ndev
->reg_ofs
.lnk_cntl
);
1232 ntb_cntl
|= NTB_LINK_DISABLE
;
1233 writel(ntb_cntl
, ndev
->reg_ofs
.lnk_cntl
);
1235 ntb_transport_free(ndev
->ntb_transport
);
1237 ntb_free_interrupts(ndev
);
1238 ntb_free_callbacks(ndev
);
1239 ntb_device_free(ndev
);
1241 for (i
= 0; i
< NTB_MAX_NUM_MW
; i
++)
1242 iounmap(ndev
->mw
[i
].vbase
);
1244 iounmap(ndev
->reg_base
);
1245 pci_release_selected_regions(pdev
, NTB_BAR_MASK
);
1246 pci_disable_device(pdev
);
1247 ntb_free_debugfs(ndev
);
1251 static struct pci_driver ntb_pci_driver
= {
1252 .name
= KBUILD_MODNAME
,
1253 .id_table
= ntb_pci_tbl
,
1254 .probe
= ntb_pci_probe
,
1255 .remove
= ntb_pci_remove
,
1257 module_pci_driver(ntb_pci_driver
);