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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Mellanox BlueField SoC TmFifo driver
4 *
5 * Copyright (C) 2019 Mellanox Technologies
6 */
7
8#include <linux/acpi.h>
9#include <linux/bitfield.h>
10#include <linux/circ_buf.h>
11#include <linux/efi.h>
12#include <linux/irq.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/platform_device.h>
16#include <linux/types.h>
17
18#include <linux/virtio_config.h>
19#include <linux/virtio_console.h>
20#include <linux/virtio_ids.h>
21#include <linux/virtio_net.h>
22#include <linux/virtio_ring.h>
23
24#include "mlxbf-tmfifo-regs.h"
25
26/* Vring size. */
27#define MLXBF_TMFIFO_VRING_SIZE SZ_1K
28
29/* Console Tx buffer size. */
30#define MLXBF_TMFIFO_CON_TX_BUF_SIZE SZ_32K
31
32/* Console Tx buffer reserved space. */
33#define MLXBF_TMFIFO_CON_TX_BUF_RSV_SIZE 8
34
35/* House-keeping timer interval. */
36#define MLXBF_TMFIFO_TIMER_INTERVAL (HZ / 10)
37
38/* Virtual devices sharing the TM FIFO. */
39#define MLXBF_TMFIFO_VDEV_MAX (VIRTIO_ID_CONSOLE + 1)
40
41/*
42 * Reserve 1/16 of TmFifo space, so console messages are not starved by
43 * the networking traffic.
44 */
45#define MLXBF_TMFIFO_RESERVE_RATIO 16
46
47/* Message with data needs at least two words (for header & data). */
48#define MLXBF_TMFIFO_DATA_MIN_WORDS 2
49
50/* Tx timeout in milliseconds. */
51#define TMFIFO_TX_TIMEOUT 2000
52
53/* ACPI UID for BlueField-3. */
54#define TMFIFO_BF3_UID 1
55
56struct mlxbf_tmfifo;
57
58/**
59 * struct mlxbf_tmfifo_vring - Structure of the TmFifo virtual ring
60 * @va: virtual address of the ring
61 * @dma: dma address of the ring
62 * @vq: pointer to the virtio virtqueue
63 * @desc: current descriptor of the pending packet
64 * @desc_head: head descriptor of the pending packet
65 * @drop_desc: dummy desc for packet dropping
66 * @cur_len: processed length of the current descriptor
67 * @rem_len: remaining length of the pending packet
68 * @rem_padding: remaining bytes to send as paddings
69 * @pkt_len: total length of the pending packet
70 * @next_avail: next avail descriptor id
71 * @num: vring size (number of descriptors)
72 * @align: vring alignment size
73 * @index: vring index
74 * @vdev_id: vring virtio id (VIRTIO_ID_xxx)
75 * @tx_timeout: expire time of last tx packet
76 * @fifo: pointer to the tmfifo structure
77 */
78struct mlxbf_tmfifo_vring {
79 void *va;
80 dma_addr_t dma;
81 struct virtqueue *vq;
82 struct vring_desc *desc;
83 struct vring_desc *desc_head;
84 struct vring_desc drop_desc;
85 int cur_len;
86 int rem_len;
87 int rem_padding;
88 u32 pkt_len;
89 u16 next_avail;
90 int num;
91 int align;
92 int index;
93 int vdev_id;
94 unsigned long tx_timeout;
95 struct mlxbf_tmfifo *fifo;
96};
97
98/* Check whether vring is in drop mode. */
99#define IS_VRING_DROP(_r) ({ \
100 typeof(_r) (r) = (_r); \
101 r->desc_head == &r->drop_desc; })
102
103/* A stub length to drop maximum length packet. */
104#define VRING_DROP_DESC_MAX_LEN GENMASK(15, 0)
105
106/* Interrupt types. */
107enum {
108 MLXBF_TM_RX_LWM_IRQ,
109 MLXBF_TM_RX_HWM_IRQ,
110 MLXBF_TM_TX_LWM_IRQ,
111 MLXBF_TM_TX_HWM_IRQ,
112 MLXBF_TM_MAX_IRQ
113};
114
115/* Ring types (Rx & Tx). */
116enum {
117 MLXBF_TMFIFO_VRING_RX,
118 MLXBF_TMFIFO_VRING_TX,
119 MLXBF_TMFIFO_VRING_MAX
120};
121
122/**
123 * struct mlxbf_tmfifo_vdev - Structure of the TmFifo virtual device
124 * @vdev: virtio device, in which the vdev.id.device field has the
125 * VIRTIO_ID_xxx id to distinguish the virtual device.
126 * @status: status of the device
127 * @features: supported features of the device
128 * @vrings: array of tmfifo vrings of this device
129 * @config: non-anonymous union for cons and net
130 * @config.cons: virtual console config -
131 * select if vdev.id.device is VIRTIO_ID_CONSOLE
132 * @config.net: virtual network config -
133 * select if vdev.id.device is VIRTIO_ID_NET
134 * @tx_buf: tx buffer used to buffer data before writing into the FIFO
135 */
136struct mlxbf_tmfifo_vdev {
137 struct virtio_device vdev;
138 u8 status;
139 u64 features;
140 struct mlxbf_tmfifo_vring vrings[MLXBF_TMFIFO_VRING_MAX];
141 union {
142 struct virtio_console_config cons;
143 struct virtio_net_config net;
144 } config;
145 struct circ_buf tx_buf;
146};
147
148/**
149 * struct mlxbf_tmfifo_irq_info - Structure of the interrupt information
150 * @fifo: pointer to the tmfifo structure
151 * @irq: interrupt number
152 * @index: index into the interrupt array
153 */
154struct mlxbf_tmfifo_irq_info {
155 struct mlxbf_tmfifo *fifo;
156 int irq;
157 int index;
158};
159
160/**
161 * struct mlxbf_tmfifo_io - Structure of the TmFifo IO resource (for both rx & tx)
162 * @ctl: control register offset (TMFIFO_RX_CTL / TMFIFO_TX_CTL)
163 * @sts: status register offset (TMFIFO_RX_STS / TMFIFO_TX_STS)
164 * @data: data register offset (TMFIFO_RX_DATA / TMFIFO_TX_DATA)
165 */
166struct mlxbf_tmfifo_io {
167 void __iomem *ctl;
168 void __iomem *sts;
169 void __iomem *data;
170};
171
172/**
173 * struct mlxbf_tmfifo - Structure of the TmFifo
174 * @vdev: array of the virtual devices running over the TmFifo
175 * @lock: lock to protect the TmFifo access
176 * @res0: mapped resource block 0
177 * @res1: mapped resource block 1
178 * @rx: rx io resource
179 * @tx: tx io resource
180 * @rx_fifo_size: number of entries of the Rx FIFO
181 * @tx_fifo_size: number of entries of the Tx FIFO
182 * @pend_events: pending bits for deferred events
183 * @irq_info: interrupt information
184 * @work: work struct for deferred process
185 * @timer: background timer
186 * @vring: Tx/Rx ring
187 * @spin_lock: Tx/Rx spin lock
188 * @is_ready: ready flag
189 */
190struct mlxbf_tmfifo {
191 struct mlxbf_tmfifo_vdev *vdev[MLXBF_TMFIFO_VDEV_MAX];
192 struct mutex lock; /* TmFifo lock */
193 void __iomem *res0;
194 void __iomem *res1;
195 struct mlxbf_tmfifo_io rx;
196 struct mlxbf_tmfifo_io tx;
197 int rx_fifo_size;
198 int tx_fifo_size;
199 unsigned long pend_events;
200 struct mlxbf_tmfifo_irq_info irq_info[MLXBF_TM_MAX_IRQ];
201 struct work_struct work;
202 struct timer_list timer;
203 struct mlxbf_tmfifo_vring *vring[2];
204 spinlock_t spin_lock[2]; /* spin lock */
205 bool is_ready;
206};
207
208/**
209 * struct mlxbf_tmfifo_msg_hdr - Structure of the TmFifo message header
210 * @type: message type
211 * @len: payload length in network byte order. Messages sent into the FIFO
212 * will be read by the other side as data stream in the same byte order.
213 * The length needs to be encoded into network order so both sides
214 * could understand it.
215 */
216struct mlxbf_tmfifo_msg_hdr {
217 u8 type;
218 __be16 len;
219 /* private: */
220 u8 unused[5];
221} __packed __aligned(sizeof(u64));
222
223/*
224 * Default MAC.
225 * This MAC address will be read from EFI persistent variable if configured.
226 * It can also be reconfigured with standard Linux tools.
227 */
228static u8 mlxbf_tmfifo_net_default_mac[ETH_ALEN] = {
229 0x00, 0x1A, 0xCA, 0xFF, 0xFF, 0x01
230};
231
232/* EFI variable name of the MAC address. */
233static efi_char16_t mlxbf_tmfifo_efi_name[] = L"RshimMacAddr";
234
235/* Maximum L2 header length. */
236#define MLXBF_TMFIFO_NET_L2_OVERHEAD (ETH_HLEN + VLAN_HLEN)
237
238/* Supported virtio-net features. */
239#define MLXBF_TMFIFO_NET_FEATURES \
240 (BIT_ULL(VIRTIO_NET_F_MTU) | BIT_ULL(VIRTIO_NET_F_STATUS) | \
241 BIT_ULL(VIRTIO_NET_F_MAC))
242
243#define mlxbf_vdev_to_tmfifo(d) container_of(d, struct mlxbf_tmfifo_vdev, vdev)
244
245/* Free vrings of the FIFO device. */
246static void mlxbf_tmfifo_free_vrings(struct mlxbf_tmfifo *fifo,
247 struct mlxbf_tmfifo_vdev *tm_vdev)
248{
249 struct mlxbf_tmfifo_vring *vring;
250 int i, size;
251
252 for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) {
253 vring = &tm_vdev->vrings[i];
254 if (vring->va) {
255 size = vring_size(vring->num, vring->align);
256 dma_free_coherent(tm_vdev->vdev.dev.parent, size,
257 vring->va, vring->dma);
258 vring->va = NULL;
259 if (vring->vq) {
260 vring_del_virtqueue(vring->vq);
261 vring->vq = NULL;
262 }
263 }
264 }
265}
266
267/* Allocate vrings for the FIFO. */
268static int mlxbf_tmfifo_alloc_vrings(struct mlxbf_tmfifo *fifo,
269 struct mlxbf_tmfifo_vdev *tm_vdev)
270{
271 struct mlxbf_tmfifo_vring *vring;
272 struct device *dev;
273 dma_addr_t dma;
274 int i, size;
275 void *va;
276
277 for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) {
278 vring = &tm_vdev->vrings[i];
279 vring->fifo = fifo;
280 vring->num = MLXBF_TMFIFO_VRING_SIZE;
281 vring->align = SMP_CACHE_BYTES;
282 vring->index = i;
283 vring->vdev_id = tm_vdev->vdev.id.device;
284 vring->drop_desc.len = VRING_DROP_DESC_MAX_LEN;
285 dev = &tm_vdev->vdev.dev;
286
287 size = vring_size(vring->num, vring->align);
288 va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL);
289 if (!va) {
290 mlxbf_tmfifo_free_vrings(fifo, tm_vdev);
291 dev_err(dev->parent, "dma_alloc_coherent failed\n");
292 return -ENOMEM;
293 }
294
295 vring->va = va;
296 vring->dma = dma;
297 }
298
299 return 0;
300}
301
302/* Disable interrupts of the FIFO device. */
303static void mlxbf_tmfifo_disable_irqs(struct mlxbf_tmfifo *fifo)
304{
305 int i, irq;
306
307 for (i = 0; i < MLXBF_TM_MAX_IRQ; i++) {
308 irq = fifo->irq_info[i].irq;
309 fifo->irq_info[i].irq = 0;
310 disable_irq(irq);
311 }
312}
313
314/* Interrupt handler. */
315static irqreturn_t mlxbf_tmfifo_irq_handler(int irq, void *arg)
316{
317 struct mlxbf_tmfifo_irq_info *irq_info = arg;
318
319 if (!test_and_set_bit(irq_info->index, &irq_info->fifo->pend_events))
320 schedule_work(&irq_info->fifo->work);
321
322 return IRQ_HANDLED;
323}
324
325/* Get the next packet descriptor from the vring. */
326static struct vring_desc *
327mlxbf_tmfifo_get_next_desc(struct mlxbf_tmfifo_vring *vring)
328{
329 const struct vring *vr = virtqueue_get_vring(vring->vq);
330 struct virtio_device *vdev = vring->vq->vdev;
331 unsigned int idx, head;
332
333 if (vring->next_avail == virtio16_to_cpu(vdev, vr->avail->idx))
334 return NULL;
335
336 /* Make sure 'avail->idx' is visible already. */
337 virtio_rmb(false);
338
339 idx = vring->next_avail % vr->num;
340 head = virtio16_to_cpu(vdev, vr->avail->ring[idx]);
341 if (WARN_ON(head >= vr->num))
342 return NULL;
343
344 vring->next_avail++;
345
346 return &vr->desc[head];
347}
348
349/* Release virtio descriptor. */
350static void mlxbf_tmfifo_release_desc(struct mlxbf_tmfifo_vring *vring,
351 struct vring_desc *desc, u32 len)
352{
353 const struct vring *vr = virtqueue_get_vring(vring->vq);
354 struct virtio_device *vdev = vring->vq->vdev;
355 u16 idx, vr_idx;
356
357 vr_idx = virtio16_to_cpu(vdev, vr->used->idx);
358 idx = vr_idx % vr->num;
359 vr->used->ring[idx].id = cpu_to_virtio32(vdev, desc - vr->desc);
360 vr->used->ring[idx].len = cpu_to_virtio32(vdev, len);
361
362 /*
363 * Virtio could poll and check the 'idx' to decide whether the desc is
364 * done or not. Add a memory barrier here to make sure the update above
365 * completes before updating the idx.
366 */
367 virtio_mb(false);
368 vr->used->idx = cpu_to_virtio16(vdev, vr_idx + 1);
369}
370
371/* Get the total length of the descriptor chain. */
372static u32 mlxbf_tmfifo_get_pkt_len(struct mlxbf_tmfifo_vring *vring,
373 struct vring_desc *desc)
374{
375 const struct vring *vr = virtqueue_get_vring(vring->vq);
376 struct virtio_device *vdev = vring->vq->vdev;
377 u32 len = 0, idx;
378
379 while (desc) {
380 len += virtio32_to_cpu(vdev, desc->len);
381 if (!(virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT))
382 break;
383 idx = virtio16_to_cpu(vdev, desc->next);
384 desc = &vr->desc[idx];
385 }
386
387 return len;
388}
389
390static void mlxbf_tmfifo_release_pkt(struct mlxbf_tmfifo_vring *vring)
391{
392 struct vring_desc *desc_head;
393 u32 len = 0;
394
395 if (vring->desc_head) {
396 desc_head = vring->desc_head;
397 len = vring->pkt_len;
398 } else {
399 desc_head = mlxbf_tmfifo_get_next_desc(vring);
400 len = mlxbf_tmfifo_get_pkt_len(vring, desc_head);
401 }
402
403 if (desc_head)
404 mlxbf_tmfifo_release_desc(vring, desc_head, len);
405
406 vring->pkt_len = 0;
407 vring->desc = NULL;
408 vring->desc_head = NULL;
409}
410
411static void mlxbf_tmfifo_init_net_desc(struct mlxbf_tmfifo_vring *vring,
412 struct vring_desc *desc, bool is_rx)
413{
414 struct virtio_device *vdev = vring->vq->vdev;
415 struct virtio_net_hdr *net_hdr;
416
417 net_hdr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr));
418 memset(net_hdr, 0, sizeof(*net_hdr));
419}
420
421/* Get and initialize the next packet. */
422static struct vring_desc *
423mlxbf_tmfifo_get_next_pkt(struct mlxbf_tmfifo_vring *vring, bool is_rx)
424{
425 struct vring_desc *desc;
426
427 desc = mlxbf_tmfifo_get_next_desc(vring);
428 if (desc && is_rx && vring->vdev_id == VIRTIO_ID_NET)
429 mlxbf_tmfifo_init_net_desc(vring, desc, is_rx);
430
431 vring->desc_head = desc;
432 vring->desc = desc;
433
434 return desc;
435}
436
437/* House-keeping timer. */
438static void mlxbf_tmfifo_timer(struct timer_list *t)
439{
440 struct mlxbf_tmfifo *fifo = container_of(t, struct mlxbf_tmfifo, timer);
441 int rx, tx;
442
443 rx = !test_and_set_bit(MLXBF_TM_RX_HWM_IRQ, &fifo->pend_events);
444 tx = !test_and_set_bit(MLXBF_TM_TX_LWM_IRQ, &fifo->pend_events);
445
446 if (rx || tx)
447 schedule_work(&fifo->work);
448
449 mod_timer(&fifo->timer, jiffies + MLXBF_TMFIFO_TIMER_INTERVAL);
450}
451
452/* Copy one console packet into the output buffer. */
453static void mlxbf_tmfifo_console_output_one(struct mlxbf_tmfifo_vdev *cons,
454 struct mlxbf_tmfifo_vring *vring,
455 struct vring_desc *desc)
456{
457 const struct vring *vr = virtqueue_get_vring(vring->vq);
458 struct virtio_device *vdev = &cons->vdev;
459 u32 len, idx, seg;
460 void *addr;
461
462 while (desc) {
463 addr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr));
464 len = virtio32_to_cpu(vdev, desc->len);
465
466 seg = CIRC_SPACE_TO_END(cons->tx_buf.head, cons->tx_buf.tail,
467 MLXBF_TMFIFO_CON_TX_BUF_SIZE);
468 if (len <= seg) {
469 memcpy(cons->tx_buf.buf + cons->tx_buf.head, addr, len);
470 } else {
471 memcpy(cons->tx_buf.buf + cons->tx_buf.head, addr, seg);
472 addr += seg;
473 memcpy(cons->tx_buf.buf, addr, len - seg);
474 }
475 cons->tx_buf.head = (cons->tx_buf.head + len) %
476 MLXBF_TMFIFO_CON_TX_BUF_SIZE;
477
478 if (!(virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT))
479 break;
480 idx = virtio16_to_cpu(vdev, desc->next);
481 desc = &vr->desc[idx];
482 }
483}
484
485/* Copy console data into the output buffer. */
486static void mlxbf_tmfifo_console_output(struct mlxbf_tmfifo_vdev *cons,
487 struct mlxbf_tmfifo_vring *vring)
488{
489 struct vring_desc *desc;
490 u32 len, avail;
491
492 desc = mlxbf_tmfifo_get_next_desc(vring);
493 while (desc) {
494 /* Release the packet if not enough space. */
495 len = mlxbf_tmfifo_get_pkt_len(vring, desc);
496 avail = CIRC_SPACE(cons->tx_buf.head, cons->tx_buf.tail,
497 MLXBF_TMFIFO_CON_TX_BUF_SIZE);
498 if (len + MLXBF_TMFIFO_CON_TX_BUF_RSV_SIZE > avail) {
499 mlxbf_tmfifo_release_desc(vring, desc, len);
500 break;
501 }
502
503 mlxbf_tmfifo_console_output_one(cons, vring, desc);
504 mlxbf_tmfifo_release_desc(vring, desc, len);
505 desc = mlxbf_tmfifo_get_next_desc(vring);
506 }
507}
508
509/* Get the number of available words in Rx FIFO for receiving. */
510static int mlxbf_tmfifo_get_rx_avail(struct mlxbf_tmfifo *fifo)
511{
512 u64 sts;
513
514 sts = readq(fifo->rx.sts);
515 return FIELD_GET(MLXBF_TMFIFO_RX_STS__COUNT_MASK, sts);
516}
517
518/* Get the number of available words in the TmFifo for sending. */
519static int mlxbf_tmfifo_get_tx_avail(struct mlxbf_tmfifo *fifo, int vdev_id)
520{
521 int tx_reserve;
522 u32 count;
523 u64 sts;
524
525 /* Reserve some room in FIFO for console messages. */
526 if (vdev_id == VIRTIO_ID_NET)
527 tx_reserve = fifo->tx_fifo_size / MLXBF_TMFIFO_RESERVE_RATIO;
528 else
529 tx_reserve = 1;
530
531 sts = readq(fifo->tx.sts);
532 count = FIELD_GET(MLXBF_TMFIFO_TX_STS__COUNT_MASK, sts);
533 return fifo->tx_fifo_size - tx_reserve - count;
534}
535
536/* Console Tx (move data from the output buffer into the TmFifo). */
537static void mlxbf_tmfifo_console_tx(struct mlxbf_tmfifo *fifo, int avail)
538{
539 struct mlxbf_tmfifo_msg_hdr hdr;
540 struct mlxbf_tmfifo_vdev *cons;
541 unsigned long flags;
542 int size, seg;
543 void *addr;
544 u64 data;
545
546 /* Return if not enough space available. */
547 if (avail < MLXBF_TMFIFO_DATA_MIN_WORDS)
548 return;
549
550 cons = fifo->vdev[VIRTIO_ID_CONSOLE];
551 if (!cons || !cons->tx_buf.buf)
552 return;
553
554 /* Return if no data to send. */
555 size = CIRC_CNT(cons->tx_buf.head, cons->tx_buf.tail,
556 MLXBF_TMFIFO_CON_TX_BUF_SIZE);
557 if (size == 0)
558 return;
559
560 /* Adjust the size to available space. */
561 if (size + sizeof(hdr) > avail * sizeof(u64))
562 size = avail * sizeof(u64) - sizeof(hdr);
563
564 /* Write header. */
565 hdr.type = VIRTIO_ID_CONSOLE;
566 hdr.len = htons(size);
567 writeq(*(u64 *)&hdr, fifo->tx.data);
568
569 /* Use spin-lock to protect the 'cons->tx_buf'. */
570 spin_lock_irqsave(&fifo->spin_lock[0], flags);
571
572 while (size > 0) {
573 addr = cons->tx_buf.buf + cons->tx_buf.tail;
574
575 seg = CIRC_CNT_TO_END(cons->tx_buf.head, cons->tx_buf.tail,
576 MLXBF_TMFIFO_CON_TX_BUF_SIZE);
577 if (seg >= sizeof(u64)) {
578 memcpy(&data, addr, sizeof(u64));
579 } else {
580 memcpy(&data, addr, seg);
581 memcpy((u8 *)&data + seg, cons->tx_buf.buf,
582 sizeof(u64) - seg);
583 }
584 writeq(data, fifo->tx.data);
585
586 if (size >= sizeof(u64)) {
587 cons->tx_buf.tail = (cons->tx_buf.tail + sizeof(u64)) %
588 MLXBF_TMFIFO_CON_TX_BUF_SIZE;
589 size -= sizeof(u64);
590 } else {
591 cons->tx_buf.tail = (cons->tx_buf.tail + size) %
592 MLXBF_TMFIFO_CON_TX_BUF_SIZE;
593 size = 0;
594 }
595 }
596
597 spin_unlock_irqrestore(&fifo->spin_lock[0], flags);
598}
599
600/* Rx/Tx one word in the descriptor buffer. */
601static void mlxbf_tmfifo_rxtx_word(struct mlxbf_tmfifo_vring *vring,
602 struct vring_desc *desc,
603 bool is_rx, int len)
604{
605 struct virtio_device *vdev = vring->vq->vdev;
606 struct mlxbf_tmfifo *fifo = vring->fifo;
607 void *addr;
608 u64 data;
609
610 /* Get the buffer address of this desc. */
611 addr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr));
612
613 /* Read a word from FIFO for Rx. */
614 if (is_rx)
615 data = readq(fifo->rx.data);
616
617 if (vring->cur_len + sizeof(u64) <= len) {
618 /* The whole word. */
619 if (is_rx) {
620 if (!IS_VRING_DROP(vring))
621 memcpy(addr + vring->cur_len, &data,
622 sizeof(u64));
623 } else {
624 memcpy(&data, addr + vring->cur_len,
625 sizeof(u64));
626 }
627 vring->cur_len += sizeof(u64);
628 } else {
629 /* Leftover bytes. */
630 if (is_rx) {
631 if (!IS_VRING_DROP(vring))
632 memcpy(addr + vring->cur_len, &data,
633 len - vring->cur_len);
634 } else {
635 data = 0;
636 memcpy(&data, addr + vring->cur_len,
637 len - vring->cur_len);
638 }
639 vring->cur_len = len;
640 }
641
642 /* Write the word into FIFO for Tx. */
643 if (!is_rx)
644 writeq(data, fifo->tx.data);
645}
646
647/*
648 * Rx/Tx packet header.
649 *
650 * In Rx case, the packet might be found to belong to a different vring since
651 * the TmFifo is shared by different services. In such case, the 'vring_change'
652 * flag is set.
653 */
654static void mlxbf_tmfifo_rxtx_header(struct mlxbf_tmfifo_vring *vring,
655 struct vring_desc **desc,
656 bool is_rx, bool *vring_change)
657{
658 struct mlxbf_tmfifo *fifo = vring->fifo;
659 struct virtio_net_config *config;
660 struct mlxbf_tmfifo_msg_hdr hdr;
661 int vdev_id, hdr_len;
662 bool drop_rx = false;
663
664 /* Read/Write packet header. */
665 if (is_rx) {
666 /* Drain one word from the FIFO. */
667 *(u64 *)&hdr = readq(fifo->rx.data);
668
669 /* Skip the length 0 packets (keepalive). */
670 if (hdr.len == 0)
671 return;
672
673 /* Check packet type. */
674 if (hdr.type == VIRTIO_ID_NET) {
675 vdev_id = VIRTIO_ID_NET;
676 hdr_len = sizeof(struct virtio_net_hdr);
677 config = &fifo->vdev[vdev_id]->config.net;
678 /* A legacy-only interface for now. */
679 if (ntohs(hdr.len) >
680 __virtio16_to_cpu(virtio_legacy_is_little_endian(),
681 config->mtu) +
682 MLXBF_TMFIFO_NET_L2_OVERHEAD)
683 drop_rx = true;
684 } else {
685 vdev_id = VIRTIO_ID_CONSOLE;
686 hdr_len = 0;
687 }
688
689 /*
690 * Check whether the new packet still belongs to this vring.
691 * If not, update the pkt_len of the new vring.
692 */
693 if (vdev_id != vring->vdev_id) {
694 struct mlxbf_tmfifo_vdev *tm_dev2 = fifo->vdev[vdev_id];
695
696 if (!tm_dev2)
697 return;
698 vring->desc = *desc;
699 vring = &tm_dev2->vrings[MLXBF_TMFIFO_VRING_RX];
700 *vring_change = true;
701 }
702
703 if (drop_rx && !IS_VRING_DROP(vring)) {
704 if (vring->desc_head)
705 mlxbf_tmfifo_release_pkt(vring);
706 *desc = &vring->drop_desc;
707 vring->desc_head = *desc;
708 vring->desc = *desc;
709 }
710
711 vring->pkt_len = ntohs(hdr.len) + hdr_len;
712 } else {
713 /* Network virtio has an extra header. */
714 hdr_len = (vring->vdev_id == VIRTIO_ID_NET) ?
715 sizeof(struct virtio_net_hdr) : 0;
716 vring->pkt_len = mlxbf_tmfifo_get_pkt_len(vring, *desc);
717 hdr.type = (vring->vdev_id == VIRTIO_ID_NET) ?
718 VIRTIO_ID_NET : VIRTIO_ID_CONSOLE;
719 hdr.len = htons(vring->pkt_len - hdr_len);
720 writeq(*(u64 *)&hdr, fifo->tx.data);
721 }
722
723 vring->cur_len = hdr_len;
724 vring->rem_len = vring->pkt_len;
725 fifo->vring[is_rx] = vring;
726}
727
728/*
729 * Rx/Tx one descriptor.
730 *
731 * Return true to indicate more data available.
732 */
733static bool mlxbf_tmfifo_rxtx_one_desc(struct mlxbf_tmfifo_vring *vring,
734 bool is_rx, int *avail)
735{
736 const struct vring *vr = virtqueue_get_vring(vring->vq);
737 struct mlxbf_tmfifo *fifo = vring->fifo;
738 struct virtio_device *vdev;
739 bool vring_change = false;
740 struct vring_desc *desc;
741 unsigned long flags;
742 u32 len, idx;
743
744 vdev = &fifo->vdev[vring->vdev_id]->vdev;
745
746 /* Get the descriptor of the next packet. */
747 if (!vring->desc) {
748 desc = mlxbf_tmfifo_get_next_pkt(vring, is_rx);
749 if (!desc) {
750 /* Drop next Rx packet to avoid stuck. */
751 if (is_rx) {
752 desc = &vring->drop_desc;
753 vring->desc_head = desc;
754 vring->desc = desc;
755 } else {
756 return false;
757 }
758 }
759 } else {
760 desc = vring->desc;
761 }
762
763 /* Beginning of a packet. Start to Rx/Tx packet header. */
764 if (vring->pkt_len == 0) {
765 mlxbf_tmfifo_rxtx_header(vring, &desc, is_rx, &vring_change);
766 (*avail)--;
767
768 /* Return if new packet is for another ring. */
769 if (vring_change)
770 return false;
771 goto mlxbf_tmfifo_desc_done;
772 }
773
774 /* Get the length of this desc. */
775 len = virtio32_to_cpu(vdev, desc->len);
776 if (len > vring->rem_len)
777 len = vring->rem_len;
778
779 /* Rx/Tx one word (8 bytes) if not done. */
780 if (vring->cur_len < len) {
781 mlxbf_tmfifo_rxtx_word(vring, desc, is_rx, len);
782 (*avail)--;
783 }
784
785 /* Check again whether it's done. */
786 if (vring->cur_len == len) {
787 vring->cur_len = 0;
788 vring->rem_len -= len;
789
790 /* Get the next desc on the chain. */
791 if (!IS_VRING_DROP(vring) && vring->rem_len > 0 &&
792 (virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT)) {
793 idx = virtio16_to_cpu(vdev, desc->next);
794 desc = &vr->desc[idx];
795 goto mlxbf_tmfifo_desc_done;
796 }
797
798 /* Done and release the packet. */
799 desc = NULL;
800 fifo->vring[is_rx] = NULL;
801 if (!IS_VRING_DROP(vring)) {
802 mlxbf_tmfifo_release_pkt(vring);
803 } else {
804 vring->pkt_len = 0;
805 vring->desc_head = NULL;
806 vring->desc = NULL;
807 return false;
808 }
809
810 /*
811 * Make sure the load/store are in order before
812 * returning back to virtio.
813 */
814 virtio_mb(false);
815
816 /* Notify upper layer that packet is done. */
817 spin_lock_irqsave(&fifo->spin_lock[is_rx], flags);
818 vring_interrupt(0, vring->vq);
819 spin_unlock_irqrestore(&fifo->spin_lock[is_rx], flags);
820 }
821
822mlxbf_tmfifo_desc_done:
823 /* Save the current desc. */
824 vring->desc = desc;
825
826 return true;
827}
828
829static void mlxbf_tmfifo_check_tx_timeout(struct mlxbf_tmfifo_vring *vring)
830{
831 unsigned long flags;
832
833 /* Only handle Tx timeout for network vdev. */
834 if (vring->vdev_id != VIRTIO_ID_NET)
835 return;
836
837 /* Initialize the timeout or return if not expired. */
838 if (!vring->tx_timeout) {
839 /* Initialize the timeout. */
840 vring->tx_timeout = jiffies +
841 msecs_to_jiffies(TMFIFO_TX_TIMEOUT);
842 return;
843 } else if (time_before(jiffies, vring->tx_timeout)) {
844 /* Return if not timeout yet. */
845 return;
846 }
847
848 /*
849 * Drop the packet after timeout. The outstanding packet is
850 * released and the remaining bytes will be sent with padding byte 0x00
851 * as a recovery. On the peer(host) side, the padding bytes 0x00 will be
852 * either dropped directly, or appended into existing outstanding packet
853 * thus dropped as corrupted network packet.
854 */
855 vring->rem_padding = round_up(vring->rem_len, sizeof(u64));
856 mlxbf_tmfifo_release_pkt(vring);
857 vring->cur_len = 0;
858 vring->rem_len = 0;
859 vring->fifo->vring[0] = NULL;
860
861 /*
862 * Make sure the load/store are in order before
863 * returning back to virtio.
864 */
865 virtio_mb(false);
866
867 /* Notify upper layer. */
868 spin_lock_irqsave(&vring->fifo->spin_lock[0], flags);
869 vring_interrupt(0, vring->vq);
870 spin_unlock_irqrestore(&vring->fifo->spin_lock[0], flags);
871}
872
873/* Rx & Tx processing of a queue. */
874static void mlxbf_tmfifo_rxtx(struct mlxbf_tmfifo_vring *vring, bool is_rx)
875{
876 int avail = 0, devid = vring->vdev_id;
877 struct mlxbf_tmfifo *fifo;
878 bool more;
879
880 fifo = vring->fifo;
881
882 /* Return if vdev is not ready. */
883 if (!fifo || !fifo->vdev[devid])
884 return;
885
886 /* Return if another vring is running. */
887 if (fifo->vring[is_rx] && fifo->vring[is_rx] != vring)
888 return;
889
890 /* Only handle console and network for now. */
891 if (WARN_ON(devid != VIRTIO_ID_NET && devid != VIRTIO_ID_CONSOLE))
892 return;
893
894 do {
895retry:
896 /* Get available FIFO space. */
897 if (avail == 0) {
898 if (is_rx)
899 avail = mlxbf_tmfifo_get_rx_avail(fifo);
900 else
901 avail = mlxbf_tmfifo_get_tx_avail(fifo, devid);
902 if (avail <= 0)
903 break;
904 }
905
906 /* Insert paddings for discarded Tx packet. */
907 if (!is_rx) {
908 vring->tx_timeout = 0;
909 while (vring->rem_padding >= sizeof(u64)) {
910 writeq(0, vring->fifo->tx.data);
911 vring->rem_padding -= sizeof(u64);
912 if (--avail == 0)
913 goto retry;
914 }
915 }
916
917 /* Console output always comes from the Tx buffer. */
918 if (!is_rx && devid == VIRTIO_ID_CONSOLE) {
919 mlxbf_tmfifo_console_tx(fifo, avail);
920 break;
921 }
922
923 /* Handle one descriptor. */
924 more = mlxbf_tmfifo_rxtx_one_desc(vring, is_rx, &avail);
925 } while (more);
926
927 /* Check Tx timeout. */
928 if (avail <= 0 && !is_rx)
929 mlxbf_tmfifo_check_tx_timeout(vring);
930}
931
932/* Handle Rx or Tx queues. */
933static void mlxbf_tmfifo_work_rxtx(struct mlxbf_tmfifo *fifo, int queue_id,
934 int irq_id, bool is_rx)
935{
936 struct mlxbf_tmfifo_vdev *tm_vdev;
937 struct mlxbf_tmfifo_vring *vring;
938 int i;
939
940 if (!test_and_clear_bit(irq_id, &fifo->pend_events) ||
941 !fifo->irq_info[irq_id].irq)
942 return;
943
944 for (i = 0; i < MLXBF_TMFIFO_VDEV_MAX; i++) {
945 tm_vdev = fifo->vdev[i];
946 if (tm_vdev) {
947 vring = &tm_vdev->vrings[queue_id];
948 if (vring->vq)
949 mlxbf_tmfifo_rxtx(vring, is_rx);
950 }
951 }
952}
953
954/* Work handler for Rx and Tx case. */
955static void mlxbf_tmfifo_work_handler(struct work_struct *work)
956{
957 struct mlxbf_tmfifo *fifo;
958
959 fifo = container_of(work, struct mlxbf_tmfifo, work);
960 if (!fifo->is_ready)
961 return;
962
963 mutex_lock(&fifo->lock);
964
965 /* Tx (Send data to the TmFifo). */
966 mlxbf_tmfifo_work_rxtx(fifo, MLXBF_TMFIFO_VRING_TX,
967 MLXBF_TM_TX_LWM_IRQ, false);
968
969 /* Rx (Receive data from the TmFifo). */
970 mlxbf_tmfifo_work_rxtx(fifo, MLXBF_TMFIFO_VRING_RX,
971 MLXBF_TM_RX_HWM_IRQ, true);
972
973 mutex_unlock(&fifo->lock);
974}
975
976/* The notify function is called when new buffers are posted. */
977static bool mlxbf_tmfifo_virtio_notify(struct virtqueue *vq)
978{
979 struct mlxbf_tmfifo_vring *vring = vq->priv;
980 struct mlxbf_tmfifo_vdev *tm_vdev;
981 struct mlxbf_tmfifo *fifo;
982 unsigned long flags;
983
984 fifo = vring->fifo;
985
986 /*
987 * Virtio maintains vrings in pairs, even number ring for Rx
988 * and odd number ring for Tx.
989 */
990 if (vring->index & BIT(0)) {
991 /*
992 * Console could make blocking call with interrupts disabled.
993 * In such case, the vring needs to be served right away. For
994 * other cases, just set the TX LWM bit to start Tx in the
995 * worker handler.
996 */
997 if (vring->vdev_id == VIRTIO_ID_CONSOLE) {
998 spin_lock_irqsave(&fifo->spin_lock[0], flags);
999 tm_vdev = fifo->vdev[VIRTIO_ID_CONSOLE];
1000 mlxbf_tmfifo_console_output(tm_vdev, vring);
1001 spin_unlock_irqrestore(&fifo->spin_lock[0], flags);
1002 set_bit(MLXBF_TM_TX_LWM_IRQ, &fifo->pend_events);
1003 } else if (test_and_set_bit(MLXBF_TM_TX_LWM_IRQ,
1004 &fifo->pend_events)) {
1005 return true;
1006 }
1007 } else {
1008 if (test_and_set_bit(MLXBF_TM_RX_HWM_IRQ, &fifo->pend_events))
1009 return true;
1010 }
1011
1012 schedule_work(&fifo->work);
1013
1014 return true;
1015}
1016
1017/* Get the array of feature bits for this device. */
1018static u64 mlxbf_tmfifo_virtio_get_features(struct virtio_device *vdev)
1019{
1020 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1021
1022 return tm_vdev->features;
1023}
1024
1025/* Confirm device features to use. */
1026static int mlxbf_tmfifo_virtio_finalize_features(struct virtio_device *vdev)
1027{
1028 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1029
1030 tm_vdev->features = vdev->features;
1031
1032 return 0;
1033}
1034
1035/* Free virtqueues found by find_vqs(). */
1036static void mlxbf_tmfifo_virtio_del_vqs(struct virtio_device *vdev)
1037{
1038 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1039 struct mlxbf_tmfifo_vring *vring;
1040 struct virtqueue *vq;
1041 int i;
1042
1043 for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) {
1044 vring = &tm_vdev->vrings[i];
1045
1046 /* Release the pending packet. */
1047 if (vring->desc)
1048 mlxbf_tmfifo_release_pkt(vring);
1049 vq = vring->vq;
1050 if (vq) {
1051 vring->vq = NULL;
1052 vring_del_virtqueue(vq);
1053 }
1054 }
1055}
1056
1057/* Create and initialize the virtual queues. */
1058static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
1059 unsigned int nvqs,
1060 struct virtqueue *vqs[],
1061 struct virtqueue_info vqs_info[],
1062 struct irq_affinity *desc)
1063{
1064 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1065 struct mlxbf_tmfifo_vring *vring;
1066 struct virtqueue *vq;
1067 int i, ret, size;
1068
1069 if (nvqs > ARRAY_SIZE(tm_vdev->vrings))
1070 return -EINVAL;
1071
1072 for (i = 0; i < nvqs; ++i) {
1073 struct virtqueue_info *vqi = &vqs_info[i];
1074
1075 if (!vqi->name) {
1076 ret = -EINVAL;
1077 goto error;
1078 }
1079 vring = &tm_vdev->vrings[i];
1080
1081 /* zero vring */
1082 size = vring_size(vring->num, vring->align);
1083 memset(vring->va, 0, size);
1084 vq = vring_new_virtqueue(i, vring->num, vring->align, vdev,
1085 false, false, vring->va,
1086 mlxbf_tmfifo_virtio_notify,
1087 vqi->callback, vqi->name);
1088 if (!vq) {
1089 dev_err(&vdev->dev, "vring_new_virtqueue failed\n");
1090 ret = -ENOMEM;
1091 goto error;
1092 }
1093
1094 vq->num_max = vring->num;
1095
1096 vq->priv = vring;
1097
1098 /* Make vq update visible before using it. */
1099 virtio_mb(false);
1100
1101 vqs[i] = vq;
1102 vring->vq = vq;
1103 }
1104
1105 return 0;
1106
1107error:
1108 mlxbf_tmfifo_virtio_del_vqs(vdev);
1109 return ret;
1110}
1111
1112/* Read the status byte. */
1113static u8 mlxbf_tmfifo_virtio_get_status(struct virtio_device *vdev)
1114{
1115 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1116
1117 return tm_vdev->status;
1118}
1119
1120/* Write the status byte. */
1121static void mlxbf_tmfifo_virtio_set_status(struct virtio_device *vdev,
1122 u8 status)
1123{
1124 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1125
1126 tm_vdev->status = status;
1127}
1128
1129/* Reset the device. Not much here for now. */
1130static void mlxbf_tmfifo_virtio_reset(struct virtio_device *vdev)
1131{
1132 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1133
1134 tm_vdev->status = 0;
1135}
1136
1137/* Read the value of a configuration field. */
1138static void mlxbf_tmfifo_virtio_get(struct virtio_device *vdev,
1139 unsigned int offset,
1140 void *buf,
1141 unsigned int len)
1142{
1143 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1144
1145 if ((u64)offset + len > sizeof(tm_vdev->config))
1146 return;
1147
1148 memcpy(buf, (u8 *)&tm_vdev->config + offset, len);
1149}
1150
1151/* Write the value of a configuration field. */
1152static void mlxbf_tmfifo_virtio_set(struct virtio_device *vdev,
1153 unsigned int offset,
1154 const void *buf,
1155 unsigned int len)
1156{
1157 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1158
1159 if ((u64)offset + len > sizeof(tm_vdev->config))
1160 return;
1161
1162 memcpy((u8 *)&tm_vdev->config + offset, buf, len);
1163}
1164
1165static void tmfifo_virtio_dev_release(struct device *device)
1166{
1167 struct virtio_device *vdev =
1168 container_of(device, struct virtio_device, dev);
1169 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1170
1171 kfree(tm_vdev);
1172}
1173
1174/* Virtio config operations. */
1175static const struct virtio_config_ops mlxbf_tmfifo_virtio_config_ops = {
1176 .get_features = mlxbf_tmfifo_virtio_get_features,
1177 .finalize_features = mlxbf_tmfifo_virtio_finalize_features,
1178 .find_vqs = mlxbf_tmfifo_virtio_find_vqs,
1179 .del_vqs = mlxbf_tmfifo_virtio_del_vqs,
1180 .reset = mlxbf_tmfifo_virtio_reset,
1181 .set_status = mlxbf_tmfifo_virtio_set_status,
1182 .get_status = mlxbf_tmfifo_virtio_get_status,
1183 .get = mlxbf_tmfifo_virtio_get,
1184 .set = mlxbf_tmfifo_virtio_set,
1185};
1186
1187/* Create vdev for the FIFO. */
1188static int mlxbf_tmfifo_create_vdev(struct device *dev,
1189 struct mlxbf_tmfifo *fifo,
1190 int vdev_id, u64 features,
1191 void *config, u32 size)
1192{
1193 struct mlxbf_tmfifo_vdev *tm_vdev, *reg_dev = NULL;
1194 int ret;
1195
1196 mutex_lock(&fifo->lock);
1197
1198 tm_vdev = fifo->vdev[vdev_id];
1199 if (tm_vdev) {
1200 dev_err(dev, "vdev %d already exists\n", vdev_id);
1201 ret = -EEXIST;
1202 goto fail;
1203 }
1204
1205 tm_vdev = kzalloc(sizeof(*tm_vdev), GFP_KERNEL);
1206 if (!tm_vdev) {
1207 ret = -ENOMEM;
1208 goto fail;
1209 }
1210
1211 tm_vdev->vdev.id.device = vdev_id;
1212 tm_vdev->vdev.config = &mlxbf_tmfifo_virtio_config_ops;
1213 tm_vdev->vdev.dev.parent = dev;
1214 tm_vdev->vdev.dev.release = tmfifo_virtio_dev_release;
1215 tm_vdev->features = features;
1216 if (config)
1217 memcpy(&tm_vdev->config, config, size);
1218
1219 if (mlxbf_tmfifo_alloc_vrings(fifo, tm_vdev)) {
1220 dev_err(dev, "unable to allocate vring\n");
1221 ret = -ENOMEM;
1222 goto vdev_fail;
1223 }
1224
1225 /* Allocate an output buffer for the console device. */
1226 if (vdev_id == VIRTIO_ID_CONSOLE)
1227 tm_vdev->tx_buf.buf = devm_kmalloc(dev,
1228 MLXBF_TMFIFO_CON_TX_BUF_SIZE,
1229 GFP_KERNEL);
1230 fifo->vdev[vdev_id] = tm_vdev;
1231
1232 /* Register the virtio device. */
1233 ret = register_virtio_device(&tm_vdev->vdev);
1234 reg_dev = tm_vdev;
1235 if (ret) {
1236 dev_err(dev, "register_virtio_device failed\n");
1237 goto vdev_fail;
1238 }
1239
1240 mutex_unlock(&fifo->lock);
1241 return 0;
1242
1243vdev_fail:
1244 mlxbf_tmfifo_free_vrings(fifo, tm_vdev);
1245 fifo->vdev[vdev_id] = NULL;
1246 if (reg_dev)
1247 put_device(&tm_vdev->vdev.dev);
1248 else
1249 kfree(tm_vdev);
1250fail:
1251 mutex_unlock(&fifo->lock);
1252 return ret;
1253}
1254
1255/* Delete vdev for the FIFO. */
1256static int mlxbf_tmfifo_delete_vdev(struct mlxbf_tmfifo *fifo, int vdev_id)
1257{
1258 struct mlxbf_tmfifo_vdev *tm_vdev;
1259
1260 mutex_lock(&fifo->lock);
1261
1262 /* Unregister vdev. */
1263 tm_vdev = fifo->vdev[vdev_id];
1264 if (tm_vdev) {
1265 unregister_virtio_device(&tm_vdev->vdev);
1266 mlxbf_tmfifo_free_vrings(fifo, tm_vdev);
1267 fifo->vdev[vdev_id] = NULL;
1268 }
1269
1270 mutex_unlock(&fifo->lock);
1271
1272 return 0;
1273}
1274
1275/* Read the configured network MAC address from efi variable. */
1276static void mlxbf_tmfifo_get_cfg_mac(u8 *mac)
1277{
1278 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
1279 unsigned long size = ETH_ALEN;
1280 u8 buf[ETH_ALEN];
1281 efi_status_t rc;
1282
1283 rc = efi.get_variable(mlxbf_tmfifo_efi_name, &guid, NULL, &size, buf);
1284 if (rc == EFI_SUCCESS && size == ETH_ALEN)
1285 ether_addr_copy(mac, buf);
1286 else
1287 ether_addr_copy(mac, mlxbf_tmfifo_net_default_mac);
1288}
1289
1290/* Set TmFifo thresolds which is used to trigger interrupts. */
1291static void mlxbf_tmfifo_set_threshold(struct mlxbf_tmfifo *fifo)
1292{
1293 u64 ctl;
1294
1295 /* Get Tx FIFO size and set the low/high watermark. */
1296 ctl = readq(fifo->tx.ctl);
1297 fifo->tx_fifo_size =
1298 FIELD_GET(MLXBF_TMFIFO_TX_CTL__MAX_ENTRIES_MASK, ctl);
1299 ctl = (ctl & ~MLXBF_TMFIFO_TX_CTL__LWM_MASK) |
1300 FIELD_PREP(MLXBF_TMFIFO_TX_CTL__LWM_MASK,
1301 fifo->tx_fifo_size / 2);
1302 ctl = (ctl & ~MLXBF_TMFIFO_TX_CTL__HWM_MASK) |
1303 FIELD_PREP(MLXBF_TMFIFO_TX_CTL__HWM_MASK,
1304 fifo->tx_fifo_size - 1);
1305 writeq(ctl, fifo->tx.ctl);
1306
1307 /* Get Rx FIFO size and set the low/high watermark. */
1308 ctl = readq(fifo->rx.ctl);
1309 fifo->rx_fifo_size =
1310 FIELD_GET(MLXBF_TMFIFO_RX_CTL__MAX_ENTRIES_MASK, ctl);
1311 ctl = (ctl & ~MLXBF_TMFIFO_RX_CTL__LWM_MASK) |
1312 FIELD_PREP(MLXBF_TMFIFO_RX_CTL__LWM_MASK, 0);
1313 ctl = (ctl & ~MLXBF_TMFIFO_RX_CTL__HWM_MASK) |
1314 FIELD_PREP(MLXBF_TMFIFO_RX_CTL__HWM_MASK, 1);
1315 writeq(ctl, fifo->rx.ctl);
1316}
1317
1318static void mlxbf_tmfifo_cleanup(struct mlxbf_tmfifo *fifo)
1319{
1320 int i;
1321
1322 fifo->is_ready = false;
1323 del_timer_sync(&fifo->timer);
1324 mlxbf_tmfifo_disable_irqs(fifo);
1325 cancel_work_sync(&fifo->work);
1326 for (i = 0; i < MLXBF_TMFIFO_VDEV_MAX; i++)
1327 mlxbf_tmfifo_delete_vdev(fifo, i);
1328}
1329
1330/* Probe the TMFIFO. */
1331static int mlxbf_tmfifo_probe(struct platform_device *pdev)
1332{
1333 struct virtio_net_config net_config;
1334 struct device *dev = &pdev->dev;
1335 struct mlxbf_tmfifo *fifo;
1336 u64 dev_id;
1337 int i, rc;
1338
1339 rc = acpi_dev_uid_to_integer(ACPI_COMPANION(dev), &dev_id);
1340 if (rc) {
1341 dev_err(dev, "Cannot retrieve UID\n");
1342 return rc;
1343 }
1344
1345 fifo = devm_kzalloc(dev, sizeof(*fifo), GFP_KERNEL);
1346 if (!fifo)
1347 return -ENOMEM;
1348
1349 spin_lock_init(&fifo->spin_lock[0]);
1350 spin_lock_init(&fifo->spin_lock[1]);
1351 INIT_WORK(&fifo->work, mlxbf_tmfifo_work_handler);
1352 mutex_init(&fifo->lock);
1353
1354 /* Get the resource of the Rx FIFO. */
1355 fifo->res0 = devm_platform_ioremap_resource(pdev, 0);
1356 if (IS_ERR(fifo->res0))
1357 return PTR_ERR(fifo->res0);
1358
1359 /* Get the resource of the Tx FIFO. */
1360 fifo->res1 = devm_platform_ioremap_resource(pdev, 1);
1361 if (IS_ERR(fifo->res1))
1362 return PTR_ERR(fifo->res1);
1363
1364 if (dev_id == TMFIFO_BF3_UID) {
1365 fifo->rx.ctl = fifo->res1 + MLXBF_TMFIFO_RX_CTL_BF3;
1366 fifo->rx.sts = fifo->res1 + MLXBF_TMFIFO_RX_STS_BF3;
1367 fifo->rx.data = fifo->res0 + MLXBF_TMFIFO_RX_DATA_BF3;
1368 fifo->tx.ctl = fifo->res1 + MLXBF_TMFIFO_TX_CTL_BF3;
1369 fifo->tx.sts = fifo->res1 + MLXBF_TMFIFO_TX_STS_BF3;
1370 fifo->tx.data = fifo->res0 + MLXBF_TMFIFO_TX_DATA_BF3;
1371 } else {
1372 fifo->rx.ctl = fifo->res0 + MLXBF_TMFIFO_RX_CTL;
1373 fifo->rx.sts = fifo->res0 + MLXBF_TMFIFO_RX_STS;
1374 fifo->rx.data = fifo->res0 + MLXBF_TMFIFO_RX_DATA;
1375 fifo->tx.ctl = fifo->res1 + MLXBF_TMFIFO_TX_CTL;
1376 fifo->tx.sts = fifo->res1 + MLXBF_TMFIFO_TX_STS;
1377 fifo->tx.data = fifo->res1 + MLXBF_TMFIFO_TX_DATA;
1378 }
1379
1380 platform_set_drvdata(pdev, fifo);
1381
1382 timer_setup(&fifo->timer, mlxbf_tmfifo_timer, 0);
1383
1384 for (i = 0; i < MLXBF_TM_MAX_IRQ; i++) {
1385 fifo->irq_info[i].index = i;
1386 fifo->irq_info[i].fifo = fifo;
1387 fifo->irq_info[i].irq = platform_get_irq(pdev, i);
1388 rc = devm_request_irq(dev, fifo->irq_info[i].irq,
1389 mlxbf_tmfifo_irq_handler, 0,
1390 "tmfifo", &fifo->irq_info[i]);
1391 if (rc) {
1392 dev_err(dev, "devm_request_irq failed\n");
1393 fifo->irq_info[i].irq = 0;
1394 return rc;
1395 }
1396 }
1397
1398 mlxbf_tmfifo_set_threshold(fifo);
1399
1400 /* Create the console vdev. */
1401 rc = mlxbf_tmfifo_create_vdev(dev, fifo, VIRTIO_ID_CONSOLE, 0, NULL, 0);
1402 if (rc)
1403 goto fail;
1404
1405 /* Create the network vdev. */
1406 memset(&net_config, 0, sizeof(net_config));
1407
1408 /* A legacy-only interface for now. */
1409 net_config.mtu = __cpu_to_virtio16(virtio_legacy_is_little_endian(),
1410 ETH_DATA_LEN);
1411 net_config.status = __cpu_to_virtio16(virtio_legacy_is_little_endian(),
1412 VIRTIO_NET_S_LINK_UP);
1413 mlxbf_tmfifo_get_cfg_mac(net_config.mac);
1414 rc = mlxbf_tmfifo_create_vdev(dev, fifo, VIRTIO_ID_NET,
1415 MLXBF_TMFIFO_NET_FEATURES, &net_config,
1416 sizeof(net_config));
1417 if (rc)
1418 goto fail;
1419
1420 mod_timer(&fifo->timer, jiffies + MLXBF_TMFIFO_TIMER_INTERVAL);
1421
1422 /* Make all updates visible before setting the 'is_ready' flag. */
1423 virtio_mb(false);
1424
1425 fifo->is_ready = true;
1426 return 0;
1427
1428fail:
1429 mlxbf_tmfifo_cleanup(fifo);
1430 return rc;
1431}
1432
1433/* Device remove function. */
1434static void mlxbf_tmfifo_remove(struct platform_device *pdev)
1435{
1436 struct mlxbf_tmfifo *fifo = platform_get_drvdata(pdev);
1437
1438 mlxbf_tmfifo_cleanup(fifo);
1439}
1440
1441static const struct acpi_device_id mlxbf_tmfifo_acpi_match[] = {
1442 { "MLNXBF01", 0 },
1443 {}
1444};
1445MODULE_DEVICE_TABLE(acpi, mlxbf_tmfifo_acpi_match);
1446
1447static struct platform_driver mlxbf_tmfifo_driver = {
1448 .probe = mlxbf_tmfifo_probe,
1449 .remove = mlxbf_tmfifo_remove,
1450 .driver = {
1451 .name = "bf-tmfifo",
1452 .acpi_match_table = mlxbf_tmfifo_acpi_match,
1453 },
1454};
1455
1456module_platform_driver(mlxbf_tmfifo_driver);
1457
1458MODULE_DESCRIPTION("Mellanox BlueField SoC TmFifo Driver");
1459MODULE_LICENSE("GPL v2");
1460MODULE_AUTHOR("Mellanox Technologies");