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) 2016 Advanced Micro Devices, Inc. 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) 2016 Advanced Micro Devices, Inc. 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 AMD 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 * AMD PCIe NTB Linux driver
45 * Contact Information:
46 * Xiangliang Yu <Xiangliang.Yu@amd.com>
49 #include <linux/debugfs.h>
50 #include <linux/delay.h>
51 #include <linux/init.h>
52 #include <linux/interrupt.h>
53 #include <linux/module.h>
54 #include <linux/acpi.h>
55 #include <linux/pci.h>
56 #include <linux/random.h>
57 #include <linux/slab.h>
58 #include <linux/ntb.h>
60 #include "ntb_hw_amd.h"
62 #define NTB_NAME "ntb_hw_amd"
63 #define NTB_DESC "AMD(R) PCI-E Non-Transparent Bridge Driver"
66 MODULE_DESCRIPTION(NTB_DESC);
67 MODULE_VERSION(NTB_VER);
68 MODULE_LICENSE("Dual BSD/GPL");
69 MODULE_AUTHOR("AMD Inc.");
71 static const struct file_operations amd_ntb_debugfs_info;
72 static struct dentry *debugfs_dir;
74 static int ndev_mw_to_bar(struct amd_ntb_dev *ndev, int idx)
76 if (idx < 0 || idx > ndev->mw_count)
82 static int amd_ntb_mw_count(struct ntb_dev *ntb)
84 return ntb_ndev(ntb)->mw_count;
87 static int amd_ntb_mw_get_range(struct ntb_dev *ntb, int idx,
89 resource_size_t *size,
90 resource_size_t *align,
91 resource_size_t *align_size)
93 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
96 bar = ndev_mw_to_bar(ndev, idx);
101 *base = pci_resource_start(ndev->ntb.pdev, bar);
104 *size = pci_resource_len(ndev->ntb.pdev, bar);
115 static int amd_ntb_mw_set_trans(struct ntb_dev *ntb, int idx,
116 dma_addr_t addr, resource_size_t size)
118 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
119 unsigned long xlat_reg, limit_reg = 0;
120 resource_size_t mw_size;
121 void __iomem *mmio, *peer_mmio;
122 u64 base_addr, limit, reg_val;
125 bar = ndev_mw_to_bar(ndev, idx);
129 mw_size = pci_resource_len(ndev->ntb.pdev, bar);
131 /* make sure the range fits in the usable mw size */
135 mmio = ndev->self_mmio;
136 peer_mmio = ndev->peer_mmio;
138 base_addr = pci_resource_start(ndev->ntb.pdev, bar);
141 xlat_reg = AMD_BAR23XLAT_OFFSET + ((bar - 2) << 2);
142 limit_reg = AMD_BAR23LMT_OFFSET + ((bar - 2) << 2);
144 /* Set the limit if supported */
147 /* set and verify setting the translation address */
148 write64(addr, peer_mmio + xlat_reg);
149 reg_val = read64(peer_mmio + xlat_reg);
150 if (reg_val != addr) {
151 write64(0, peer_mmio + xlat_reg);
155 /* set and verify setting the limit */
156 write64(limit, mmio + limit_reg);
157 reg_val = read64(mmio + limit_reg);
158 if (reg_val != limit) {
159 write64(base_addr, mmio + limit_reg);
160 write64(0, peer_mmio + xlat_reg);
164 xlat_reg = AMD_BAR1XLAT_OFFSET;
165 limit_reg = AMD_BAR1LMT_OFFSET;
167 /* Set the limit if supported */
170 /* set and verify setting the translation address */
171 write64(addr, peer_mmio + xlat_reg);
172 reg_val = read64(peer_mmio + xlat_reg);
173 if (reg_val != addr) {
174 write64(0, peer_mmio + xlat_reg);
178 /* set and verify setting the limit */
179 writel(limit, mmio + limit_reg);
180 reg_val = readl(mmio + limit_reg);
181 if (reg_val != limit) {
182 writel(base_addr, mmio + limit_reg);
183 writel(0, peer_mmio + xlat_reg);
191 static int amd_link_is_up(struct amd_ntb_dev *ndev)
194 return NTB_LNK_STA_ACTIVE(ndev->cntl_sta);
196 if (ndev->peer_sta & AMD_LINK_UP_EVENT) {
201 /* If peer_sta is reset or D0 event, the ISR has
202 * started a timer to check link status of hardware.
203 * So here just clear status bit. And if peer_sta is
204 * D3 or PME_TO, D0/reset event will be happened when
205 * system wakeup/poweron, so do nothing here.
207 if (ndev->peer_sta & AMD_PEER_RESET_EVENT)
208 ndev->peer_sta &= ~AMD_PEER_RESET_EVENT;
209 else if (ndev->peer_sta & (AMD_PEER_D0_EVENT | AMD_LINK_DOWN_EVENT))
215 static int amd_ntb_link_is_up(struct ntb_dev *ntb,
216 enum ntb_speed *speed,
217 enum ntb_width *width)
219 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
222 if (amd_link_is_up(ndev)) {
224 *speed = NTB_LNK_STA_SPEED(ndev->lnk_sta);
226 *width = NTB_LNK_STA_WIDTH(ndev->lnk_sta);
228 dev_dbg(ndev_dev(ndev), "link is up.\n");
233 *speed = NTB_SPEED_NONE;
235 *width = NTB_WIDTH_NONE;
237 dev_dbg(ndev_dev(ndev), "link is down.\n");
243 static int amd_ntb_link_enable(struct ntb_dev *ntb,
244 enum ntb_speed max_speed,
245 enum ntb_width max_width)
247 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
248 void __iomem *mmio = ndev->self_mmio;
251 /* Enable event interrupt */
252 ndev->int_mask &= ~AMD_EVENT_INTMASK;
253 writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);
255 if (ndev->ntb.topo == NTB_TOPO_SEC)
257 dev_dbg(ndev_dev(ndev), "Enabling Link.\n");
259 ntb_ctl = readl(mmio + AMD_CNTL_OFFSET);
260 ntb_ctl |= (PMM_REG_CTL | SMM_REG_CTL);
261 writel(ntb_ctl, mmio + AMD_CNTL_OFFSET);
266 static int amd_ntb_link_disable(struct ntb_dev *ntb)
268 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
269 void __iomem *mmio = ndev->self_mmio;
272 /* Disable event interrupt */
273 ndev->int_mask |= AMD_EVENT_INTMASK;
274 writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);
276 if (ndev->ntb.topo == NTB_TOPO_SEC)
278 dev_dbg(ndev_dev(ndev), "Enabling Link.\n");
280 ntb_ctl = readl(mmio + AMD_CNTL_OFFSET);
281 ntb_ctl &= ~(PMM_REG_CTL | SMM_REG_CTL);
282 writel(ntb_ctl, mmio + AMD_CNTL_OFFSET);
287 static u64 amd_ntb_db_valid_mask(struct ntb_dev *ntb)
289 return ntb_ndev(ntb)->db_valid_mask;
292 static int amd_ntb_db_vector_count(struct ntb_dev *ntb)
294 return ntb_ndev(ntb)->db_count;
297 static u64 amd_ntb_db_vector_mask(struct ntb_dev *ntb, int db_vector)
299 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
301 if (db_vector < 0 || db_vector > ndev->db_count)
304 return ntb_ndev(ntb)->db_valid_mask & (1 << db_vector);
307 static u64 amd_ntb_db_read(struct ntb_dev *ntb)
309 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
310 void __iomem *mmio = ndev->self_mmio;
312 return (u64)readw(mmio + AMD_DBSTAT_OFFSET);
315 static int amd_ntb_db_clear(struct ntb_dev *ntb, u64 db_bits)
317 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
318 void __iomem *mmio = ndev->self_mmio;
320 writew((u16)db_bits, mmio + AMD_DBSTAT_OFFSET);
325 static int amd_ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
327 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
328 void __iomem *mmio = ndev->self_mmio;
331 if (db_bits & ~ndev->db_valid_mask)
334 spin_lock_irqsave(&ndev->db_mask_lock, flags);
335 ndev->db_mask |= db_bits;
336 writew((u16)ndev->db_mask, mmio + AMD_DBMASK_OFFSET);
337 spin_unlock_irqrestore(&ndev->db_mask_lock, flags);
342 static int amd_ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
344 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
345 void __iomem *mmio = ndev->self_mmio;
348 if (db_bits & ~ndev->db_valid_mask)
351 spin_lock_irqsave(&ndev->db_mask_lock, flags);
352 ndev->db_mask &= ~db_bits;
353 writew((u16)ndev->db_mask, mmio + AMD_DBMASK_OFFSET);
354 spin_unlock_irqrestore(&ndev->db_mask_lock, flags);
359 static int amd_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
361 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
362 void __iomem *mmio = ndev->self_mmio;
364 writew((u16)db_bits, mmio + AMD_DBREQ_OFFSET);
369 static int amd_ntb_spad_count(struct ntb_dev *ntb)
371 return ntb_ndev(ntb)->spad_count;
374 static u32 amd_ntb_spad_read(struct ntb_dev *ntb, int idx)
376 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
377 void __iomem *mmio = ndev->self_mmio;
380 if (idx < 0 || idx >= ndev->spad_count)
383 offset = ndev->self_spad + (idx << 2);
384 return readl(mmio + AMD_SPAD_OFFSET + offset);
387 static int amd_ntb_spad_write(struct ntb_dev *ntb,
390 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
391 void __iomem *mmio = ndev->self_mmio;
394 if (idx < 0 || idx >= ndev->spad_count)
397 offset = ndev->self_spad + (idx << 2);
398 writel(val, mmio + AMD_SPAD_OFFSET + offset);
403 static u32 amd_ntb_peer_spad_read(struct ntb_dev *ntb, int idx)
405 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
406 void __iomem *mmio = ndev->self_mmio;
409 if (idx < 0 || idx >= ndev->spad_count)
412 offset = ndev->peer_spad + (idx << 2);
413 return readl(mmio + AMD_SPAD_OFFSET + offset);
416 static int amd_ntb_peer_spad_write(struct ntb_dev *ntb,
419 struct amd_ntb_dev *ndev = ntb_ndev(ntb);
420 void __iomem *mmio = ndev->self_mmio;
423 if (idx < 0 || idx >= ndev->spad_count)
426 offset = ndev->peer_spad + (idx << 2);
427 writel(val, mmio + AMD_SPAD_OFFSET + offset);
432 static const struct ntb_dev_ops amd_ntb_ops = {
433 .mw_count = amd_ntb_mw_count,
434 .mw_get_range = amd_ntb_mw_get_range,
435 .mw_set_trans = amd_ntb_mw_set_trans,
436 .link_is_up = amd_ntb_link_is_up,
437 .link_enable = amd_ntb_link_enable,
438 .link_disable = amd_ntb_link_disable,
439 .db_valid_mask = amd_ntb_db_valid_mask,
440 .db_vector_count = amd_ntb_db_vector_count,
441 .db_vector_mask = amd_ntb_db_vector_mask,
442 .db_read = amd_ntb_db_read,
443 .db_clear = amd_ntb_db_clear,
444 .db_set_mask = amd_ntb_db_set_mask,
445 .db_clear_mask = amd_ntb_db_clear_mask,
446 .peer_db_set = amd_ntb_peer_db_set,
447 .spad_count = amd_ntb_spad_count,
448 .spad_read = amd_ntb_spad_read,
449 .spad_write = amd_ntb_spad_write,
450 .peer_spad_read = amd_ntb_peer_spad_read,
451 .peer_spad_write = amd_ntb_peer_spad_write,
454 static void amd_ack_smu(struct amd_ntb_dev *ndev, u32 bit)
456 void __iomem *mmio = ndev->self_mmio;
459 reg = readl(mmio + AMD_SMUACK_OFFSET);
461 writel(reg, mmio + AMD_SMUACK_OFFSET);
463 ndev->peer_sta |= bit;
466 static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
468 void __iomem *mmio = ndev->self_mmio;
471 status = readl(mmio + AMD_INTSTAT_OFFSET);
472 if (!(status & AMD_EVENT_INTMASK))
475 dev_dbg(ndev_dev(ndev), "status = 0x%x and vec = %d\n", status, vec);
477 status &= AMD_EVENT_INTMASK;
479 case AMD_PEER_FLUSH_EVENT:
480 dev_info(ndev_dev(ndev), "Flush is done.\n");
482 case AMD_PEER_RESET_EVENT:
483 amd_ack_smu(ndev, AMD_PEER_RESET_EVENT);
485 /* link down first */
486 ntb_link_event(&ndev->ntb);
487 /* polling peer status */
488 schedule_delayed_work(&ndev->hb_timer, AMD_LINK_HB_TIMEOUT);
491 case AMD_PEER_D3_EVENT:
492 case AMD_PEER_PMETO_EVENT:
493 case AMD_LINK_UP_EVENT:
494 case AMD_LINK_DOWN_EVENT:
495 amd_ack_smu(ndev, status);
498 ntb_link_event(&ndev->ntb);
501 case AMD_PEER_D0_EVENT:
502 mmio = ndev->peer_mmio;
503 status = readl(mmio + AMD_PMESTAT_OFFSET);
504 /* check if this is WAKEUP event */
506 dev_info(ndev_dev(ndev), "Wakeup is done.\n");
508 amd_ack_smu(ndev, AMD_PEER_D0_EVENT);
510 /* start a timer to poll link status */
511 schedule_delayed_work(&ndev->hb_timer,
512 AMD_LINK_HB_TIMEOUT);
515 dev_info(ndev_dev(ndev), "event status = 0x%x.\n", status);
520 static irqreturn_t ndev_interrupt(struct amd_ntb_dev *ndev, int vec)
522 dev_dbg(ndev_dev(ndev), "vec %d\n", vec);
524 if (vec > (AMD_DB_CNT - 1) || (ndev->msix_vec_count == 1))
525 amd_handle_event(ndev, vec);
527 if (vec < AMD_DB_CNT)
528 ntb_db_event(&ndev->ntb, vec);
533 static irqreturn_t ndev_vec_isr(int irq, void *dev)
535 struct amd_ntb_vec *nvec = dev;
537 return ndev_interrupt(nvec->ndev, nvec->num);
540 static irqreturn_t ndev_irq_isr(int irq, void *dev)
542 struct amd_ntb_dev *ndev = dev;
544 return ndev_interrupt(ndev, irq - ndev_pdev(ndev)->irq);
547 static int ndev_init_isr(struct amd_ntb_dev *ndev,
548 int msix_min, int msix_max)
550 struct pci_dev *pdev;
551 int rc, i, msix_count, node;
553 pdev = ndev_pdev(ndev);
555 node = dev_to_node(&pdev->dev);
557 ndev->db_mask = ndev->db_valid_mask;
559 /* Try to set up msix irq */
560 ndev->vec = kzalloc_node(msix_max * sizeof(*ndev->vec),
563 goto err_msix_vec_alloc;
565 ndev->msix = kzalloc_node(msix_max * sizeof(*ndev->msix),
570 for (i = 0; i < msix_max; ++i)
571 ndev->msix[i].entry = i;
573 msix_count = pci_enable_msix_range(pdev, ndev->msix,
576 goto err_msix_enable;
578 /* NOTE: Disable MSIX if msix count is less than 16 because of
579 * hardware limitation.
581 if (msix_count < msix_min) {
582 pci_disable_msix(pdev);
583 goto err_msix_enable;
586 for (i = 0; i < msix_count; ++i) {
587 ndev->vec[i].ndev = ndev;
588 ndev->vec[i].num = i;
589 rc = request_irq(ndev->msix[i].vector, ndev_vec_isr, 0,
590 "ndev_vec_isr", &ndev->vec[i]);
592 goto err_msix_request;
595 dev_dbg(ndev_dev(ndev), "Using msix interrupts\n");
596 ndev->db_count = msix_min;
597 ndev->msix_vec_count = msix_max;
602 free_irq(ndev->msix[i].vector, &ndev->vec[i]);
603 pci_disable_msix(pdev);
612 /* Try to set up msi irq */
613 rc = pci_enable_msi(pdev);
617 rc = request_irq(pdev->irq, ndev_irq_isr, 0,
618 "ndev_irq_isr", ndev);
620 goto err_msi_request;
622 dev_dbg(ndev_dev(ndev), "Using msi interrupts\n");
624 ndev->msix_vec_count = 1;
628 pci_disable_msi(pdev);
631 /* Try to set up intx irq */
634 rc = request_irq(pdev->irq, ndev_irq_isr, IRQF_SHARED,
635 "ndev_irq_isr", ndev);
637 goto err_intx_request;
639 dev_dbg(ndev_dev(ndev), "Using intx interrupts\n");
641 ndev->msix_vec_count = 1;
648 static void ndev_deinit_isr(struct amd_ntb_dev *ndev)
650 struct pci_dev *pdev;
651 void __iomem *mmio = ndev->self_mmio;
654 pdev = ndev_pdev(ndev);
656 /* Mask all doorbell interrupts */
657 ndev->db_mask = ndev->db_valid_mask;
658 writel(ndev->db_mask, mmio + AMD_DBMASK_OFFSET);
661 i = ndev->msix_vec_count;
663 free_irq(ndev->msix[i].vector, &ndev->vec[i]);
664 pci_disable_msix(pdev);
668 free_irq(pdev->irq, ndev);
669 if (pci_dev_msi_enabled(pdev))
670 pci_disable_msi(pdev);
676 static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf,
677 size_t count, loff_t *offp)
679 struct amd_ntb_dev *ndev;
684 union { u64 v64; u32 v32; u16 v16; } u;
686 ndev = filp->private_data;
687 mmio = ndev->self_mmio;
689 buf_size = min(count, 0x800ul);
691 buf = kmalloc(buf_size, GFP_KERNEL);
697 off += scnprintf(buf + off, buf_size - off,
698 "NTB Device Information:\n");
700 off += scnprintf(buf + off, buf_size - off,
701 "Connection Topology -\t%s\n",
702 ntb_topo_string(ndev->ntb.topo));
704 off += scnprintf(buf + off, buf_size - off,
705 "LNK STA -\t\t%#06x\n", ndev->lnk_sta);
707 if (!amd_link_is_up(ndev)) {
708 off += scnprintf(buf + off, buf_size - off,
709 "Link Status -\t\tDown\n");
711 off += scnprintf(buf + off, buf_size - off,
712 "Link Status -\t\tUp\n");
713 off += scnprintf(buf + off, buf_size - off,
714 "Link Speed -\t\tPCI-E Gen %u\n",
715 NTB_LNK_STA_SPEED(ndev->lnk_sta));
716 off += scnprintf(buf + off, buf_size - off,
717 "Link Width -\t\tx%u\n",
718 NTB_LNK_STA_WIDTH(ndev->lnk_sta));
721 off += scnprintf(buf + off, buf_size - off,
722 "Memory Window Count -\t%u\n", ndev->mw_count);
723 off += scnprintf(buf + off, buf_size - off,
724 "Scratchpad Count -\t%u\n", ndev->spad_count);
725 off += scnprintf(buf + off, buf_size - off,
726 "Doorbell Count -\t%u\n", ndev->db_count);
727 off += scnprintf(buf + off, buf_size - off,
728 "MSIX Vector Count -\t%u\n", ndev->msix_vec_count);
730 off += scnprintf(buf + off, buf_size - off,
731 "Doorbell Valid Mask -\t%#llx\n", ndev->db_valid_mask);
733 u.v32 = readl(ndev->self_mmio + AMD_DBMASK_OFFSET);
734 off += scnprintf(buf + off, buf_size - off,
735 "Doorbell Mask -\t\t\t%#06x\n", u.v32);
737 u.v32 = readl(mmio + AMD_DBSTAT_OFFSET);
738 off += scnprintf(buf + off, buf_size - off,
739 "Doorbell Bell -\t\t\t%#06x\n", u.v32);
741 off += scnprintf(buf + off, buf_size - off,
742 "\nNTB Incoming XLAT:\n");
744 u.v64 = read64(mmio + AMD_BAR1XLAT_OFFSET);
745 off += scnprintf(buf + off, buf_size - off,
746 "XLAT1 -\t\t%#018llx\n", u.v64);
748 u.v64 = read64(ndev->self_mmio + AMD_BAR23XLAT_OFFSET);
749 off += scnprintf(buf + off, buf_size - off,
750 "XLAT23 -\t\t%#018llx\n", u.v64);
752 u.v64 = read64(ndev->self_mmio + AMD_BAR45XLAT_OFFSET);
753 off += scnprintf(buf + off, buf_size - off,
754 "XLAT45 -\t\t%#018llx\n", u.v64);
756 u.v32 = readl(mmio + AMD_BAR1LMT_OFFSET);
757 off += scnprintf(buf + off, buf_size - off,
758 "LMT1 -\t\t\t%#06x\n", u.v32);
760 u.v64 = read64(ndev->self_mmio + AMD_BAR23LMT_OFFSET);
761 off += scnprintf(buf + off, buf_size - off,
762 "LMT23 -\t\t\t%#018llx\n", u.v64);
764 u.v64 = read64(ndev->self_mmio + AMD_BAR45LMT_OFFSET);
765 off += scnprintf(buf + off, buf_size - off,
766 "LMT45 -\t\t\t%#018llx\n", u.v64);
768 ret = simple_read_from_buffer(ubuf, count, offp, buf, off);
773 static void ndev_init_debugfs(struct amd_ntb_dev *ndev)
776 ndev->debugfs_dir = NULL;
777 ndev->debugfs_info = NULL;
780 debugfs_create_dir(ndev_name(ndev), debugfs_dir);
781 if (!ndev->debugfs_dir)
782 ndev->debugfs_info = NULL;
785 debugfs_create_file("info", S_IRUSR,
786 ndev->debugfs_dir, ndev,
787 &amd_ntb_debugfs_info);
791 static void ndev_deinit_debugfs(struct amd_ntb_dev *ndev)
793 debugfs_remove_recursive(ndev->debugfs_dir);
796 static inline void ndev_init_struct(struct amd_ntb_dev *ndev,
797 struct pci_dev *pdev)
799 ndev->ntb.pdev = pdev;
800 ndev->ntb.topo = NTB_TOPO_NONE;
801 ndev->ntb.ops = &amd_ntb_ops;
802 ndev->int_mask = AMD_EVENT_INTMASK;
803 spin_lock_init(&ndev->db_mask_lock);
806 static int amd_poll_link(struct amd_ntb_dev *ndev)
808 void __iomem *mmio = ndev->peer_mmio;
812 reg = readl(mmio + AMD_SIDEINFO_OFFSET);
813 reg &= NTB_LIN_STA_ACTIVE_BIT;
815 dev_dbg(ndev_dev(ndev), "%s: reg_val = 0x%x.\n", __func__, reg);
817 if (reg == ndev->cntl_sta)
820 ndev->cntl_sta = reg;
822 rc = pci_read_config_dword(ndev->ntb.pdev,
823 AMD_LINK_STATUS_OFFSET, &stat);
826 ndev->lnk_sta = stat;
831 static void amd_link_hb(struct work_struct *work)
833 struct amd_ntb_dev *ndev = hb_ndev(work);
835 if (amd_poll_link(ndev))
836 ntb_link_event(&ndev->ntb);
838 if (!amd_link_is_up(ndev))
839 schedule_delayed_work(&ndev->hb_timer, AMD_LINK_HB_TIMEOUT);
842 static int amd_init_isr(struct amd_ntb_dev *ndev)
844 return ndev_init_isr(ndev, AMD_DB_CNT, AMD_MSIX_VECTOR_CNT);
847 static void amd_init_side_info(struct amd_ntb_dev *ndev)
849 void __iomem *mmio = ndev->self_mmio;
852 reg = readl(mmio + AMD_SIDEINFO_OFFSET);
853 if (!(reg & AMD_SIDE_READY)) {
854 reg |= AMD_SIDE_READY;
855 writel(reg, mmio + AMD_SIDEINFO_OFFSET);
859 static void amd_deinit_side_info(struct amd_ntb_dev *ndev)
861 void __iomem *mmio = ndev->self_mmio;
864 reg = readl(mmio + AMD_SIDEINFO_OFFSET);
865 if (reg & AMD_SIDE_READY) {
866 reg &= ~AMD_SIDE_READY;
867 writel(reg, mmio + AMD_SIDEINFO_OFFSET);
868 readl(mmio + AMD_SIDEINFO_OFFSET);
872 static int amd_init_ntb(struct amd_ntb_dev *ndev)
874 void __iomem *mmio = ndev->self_mmio;
876 ndev->mw_count = AMD_MW_CNT;
877 ndev->spad_count = AMD_SPADS_CNT;
878 ndev->db_count = AMD_DB_CNT;
880 switch (ndev->ntb.topo) {
883 ndev->spad_count >>= 1;
884 if (ndev->ntb.topo == NTB_TOPO_PRI) {
886 ndev->peer_spad = 0x20;
888 ndev->self_spad = 0x20;
892 INIT_DELAYED_WORK(&ndev->hb_timer, amd_link_hb);
893 schedule_delayed_work(&ndev->hb_timer, AMD_LINK_HB_TIMEOUT);
897 dev_err(ndev_dev(ndev), "AMD NTB does not support B2B mode.\n");
901 ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
903 /* Mask event interrupts */
904 writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);
909 static enum ntb_topo amd_get_topo(struct amd_ntb_dev *ndev)
911 void __iomem *mmio = ndev->self_mmio;
914 info = readl(mmio + AMD_SIDEINFO_OFFSET);
915 if (info & AMD_SIDE_MASK)
921 static int amd_init_dev(struct amd_ntb_dev *ndev)
923 struct pci_dev *pdev;
926 pdev = ndev_pdev(ndev);
928 ndev->ntb.topo = amd_get_topo(ndev);
929 dev_dbg(ndev_dev(ndev), "AMD NTB topo is %s\n",
930 ntb_topo_string(ndev->ntb.topo));
932 rc = amd_init_ntb(ndev);
936 rc = amd_init_isr(ndev);
938 dev_err(ndev_dev(ndev), "fail to init isr.\n");
942 ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
947 static void amd_deinit_dev(struct amd_ntb_dev *ndev)
949 cancel_delayed_work_sync(&ndev->hb_timer);
951 ndev_deinit_isr(ndev);
954 static int amd_ntb_init_pci(struct amd_ntb_dev *ndev,
955 struct pci_dev *pdev)
959 pci_set_drvdata(pdev, ndev);
961 rc = pci_enable_device(pdev);
965 rc = pci_request_regions(pdev, NTB_NAME);
967 goto err_pci_regions;
969 pci_set_master(pdev);
971 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
973 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
976 dev_warn(ndev_dev(ndev), "Cannot DMA highmem\n");
979 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
981 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
984 dev_warn(ndev_dev(ndev), "Cannot DMA consistent highmem\n");
987 ndev->self_mmio = pci_iomap(pdev, 0, 0);
988 if (!ndev->self_mmio) {
992 ndev->peer_mmio = ndev->self_mmio + AMD_PEER_OFFSET;
997 pci_clear_master(pdev);
999 pci_disable_device(pdev);
1001 pci_set_drvdata(pdev, NULL);
1005 static void amd_ntb_deinit_pci(struct amd_ntb_dev *ndev)
1007 struct pci_dev *pdev = ndev_pdev(ndev);
1009 pci_iounmap(pdev, ndev->self_mmio);
1011 pci_clear_master(pdev);
1012 pci_release_regions(pdev);
1013 pci_disable_device(pdev);
1014 pci_set_drvdata(pdev, NULL);
1017 static int amd_ntb_pci_probe(struct pci_dev *pdev,
1018 const struct pci_device_id *id)
1020 struct amd_ntb_dev *ndev;
1023 node = dev_to_node(&pdev->dev);
1025 ndev = kzalloc_node(sizeof(*ndev), GFP_KERNEL, node);
1031 ndev_init_struct(ndev, pdev);
1033 rc = amd_ntb_init_pci(ndev, pdev);
1037 rc = amd_init_dev(ndev);
1041 /* write side info */
1042 amd_init_side_info(ndev);
1044 amd_poll_link(ndev);
1046 ndev_init_debugfs(ndev);
1048 rc = ntb_register_device(&ndev->ntb);
1052 dev_info(&pdev->dev, "NTB device registered.\n");
1057 ndev_deinit_debugfs(ndev);
1058 amd_deinit_dev(ndev);
1060 amd_ntb_deinit_pci(ndev);
1067 static void amd_ntb_pci_remove(struct pci_dev *pdev)
1069 struct amd_ntb_dev *ndev = pci_get_drvdata(pdev);
1071 ntb_unregister_device(&ndev->ntb);
1072 ndev_deinit_debugfs(ndev);
1073 amd_deinit_side_info(ndev);
1074 amd_deinit_dev(ndev);
1075 amd_ntb_deinit_pci(ndev);
1079 static const struct file_operations amd_ntb_debugfs_info = {
1080 .owner = THIS_MODULE,
1081 .open = simple_open,
1082 .read = ndev_debugfs_read,
1085 static const struct pci_device_id amd_ntb_pci_tbl[] = {
1086 {PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_NTB)},
1089 MODULE_DEVICE_TABLE(pci, amd_ntb_pci_tbl);
1091 static struct pci_driver amd_ntb_pci_driver = {
1092 .name = KBUILD_MODNAME,
1093 .id_table = amd_ntb_pci_tbl,
1094 .probe = amd_ntb_pci_probe,
1095 .remove = amd_ntb_pci_remove,
1098 static int __init amd_ntb_pci_driver_init(void)
1100 pr_info("%s %s\n", NTB_DESC, NTB_VER);
1102 if (debugfs_initialized())
1103 debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
1105 return pci_register_driver(&amd_ntb_pci_driver);
1107 module_init(amd_ntb_pci_driver_init);
1109 static void __exit amd_ntb_pci_driver_exit(void)
1111 pci_unregister_driver(&amd_ntb_pci_driver);
1112 debugfs_remove_recursive(debugfs_dir);
1114 module_exit(amd_ntb_pci_driver_exit);