projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'cgroup-for-6.0-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / drivers / platform / mellanox / mlxbf-tmfifo.c
CommitLineData
1357dfd7
LS		 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
50struct mlxbf_tmfifo;
51
52/**
53 * mlxbf_tmfifo_vring - Structure of the TmFifo virtual ring
54 * @va: virtual address of the ring
55 * @dma: dma address of the ring
56 * @vq: pointer to the virtio virtqueue
57 * @desc: current descriptor of the pending packet
58 * @desc_head: head descriptor of the pending packet
59 * @cur_len: processed length of the current descriptor
60 * @rem_len: remaining length of the pending packet
61 * @pkt_len: total length of the pending packet
62 * @next_avail: next avail descriptor id
63 * @num: vring size (number of descriptors)
64 * @align: vring alignment size
65 * @index: vring index
66 * @vdev_id: vring virtio id (VIRTIO_ID_xxx)
67 * @fifo: pointer to the tmfifo structure
68 */
69struct mlxbf_tmfifo_vring {
70 void *va;
71 dma_addr_t dma;
72 struct virtqueue *vq;
73 struct vring_desc *desc;
74 struct vring_desc *desc_head;
75 int cur_len;
76 int rem_len;
77 u32 pkt_len;
78 u16 next_avail;
79 int num;
80 int align;
81 int index;
82 int vdev_id;
83 struct mlxbf_tmfifo *fifo;
84};
85
86/* Interrupt types. */
87enum {
88 MLXBF_TM_RX_LWM_IRQ,
89 MLXBF_TM_RX_HWM_IRQ,
90 MLXBF_TM_TX_LWM_IRQ,
91 MLXBF_TM_TX_HWM_IRQ,
92 MLXBF_TM_MAX_IRQ
93};
94
95/* Ring types (Rx & Tx). */
96enum {
97 MLXBF_TMFIFO_VRING_RX,
98 MLXBF_TMFIFO_VRING_TX,
99 MLXBF_TMFIFO_VRING_MAX
100};
101
102/**
103 * mlxbf_tmfifo_vdev - Structure of the TmFifo virtual device
104 * @vdev: virtio device, in which the vdev.id.device field has the
105 * VIRTIO_ID_xxx id to distinguish the virtual device.
106 * @status: status of the device
107 * @features: supported features of the device
108 * @vrings: array of tmfifo vrings of this device
109 * @config.cons: virtual console config -
110 * select if vdev.id.device is VIRTIO_ID_CONSOLE
111 * @config.net: virtual network config -
112 * select if vdev.id.device is VIRTIO_ID_NET
113 * @tx_buf: tx buffer used to buffer data before writing into the FIFO
114 */
115struct mlxbf_tmfifo_vdev {
116 struct virtio_device vdev;
117 u8 status;
118 u64 features;
119 struct mlxbf_tmfifo_vring vrings[MLXBF_TMFIFO_VRING_MAX];
120 union {
121 struct virtio_console_config cons;
122 struct virtio_net_config net;
123 } config;
124 struct circ_buf tx_buf;
125};
126
127/**
128 * mlxbf_tmfifo_irq_info - Structure of the interrupt information
129 * @fifo: pointer to the tmfifo structure
130 * @irq: interrupt number
131 * @index: index into the interrupt array
132 */
133struct mlxbf_tmfifo_irq_info {
134 struct mlxbf_tmfifo *fifo;
135 int irq;
136 int index;
137};
138
139/**
140 * mlxbf_tmfifo - Structure of the TmFifo
141 * @vdev: array of the virtual devices running over the TmFifo
142 * @lock: lock to protect the TmFifo access
143 * @rx_base: mapped register base address for the Rx FIFO
144 * @tx_base: mapped register base address for the Tx FIFO
145 * @rx_fifo_size: number of entries of the Rx FIFO
146 * @tx_fifo_size: number of entries of the Tx FIFO
147 * @pend_events: pending bits for deferred events
148 * @irq_info: interrupt information
149 * @work: work struct for deferred process
150 * @timer: background timer
151 * @vring: Tx/Rx ring
638bc4ca 152 * @spin_lock: Tx/Rx spin lock
1357dfd7
LS		 153 * @is_ready: ready flag
154 */
155struct mlxbf_tmfifo {
156 struct mlxbf_tmfifo_vdev *vdev[MLXBF_TMFIFO_VDEV_MAX];
157 struct mutex lock; /* TmFifo lock */
158 void __iomem *rx_base;
159 void __iomem *tx_base;
160 int rx_fifo_size;
161 int tx_fifo_size;
162 unsigned long pend_events;
163 struct mlxbf_tmfifo_irq_info irq_info[MLXBF_TM_MAX_IRQ];
164 struct work_struct work;
165 struct timer_list timer;
166 struct mlxbf_tmfifo_vring *vring[2];
638bc4ca 167 spinlock_t spin_lock[2]; /* spin lock */
1357dfd7
LS		 168 bool is_ready;
169};
170
171/**
172 * mlxbf_tmfifo_msg_hdr - Structure of the TmFifo message header
173 * @type: message type
174 * @len: payload length in network byte order. Messages sent into the FIFO
175 * will be read by the other side as data stream in the same byte order.
176 * The length needs to be encoded into network order so both sides
177 * could understand it.
178 */
179struct mlxbf_tmfifo_msg_hdr {
180 u8 type;
181 __be16 len;
182 u8 unused[5];
183} __packed __aligned(sizeof(u64));
184
185/*
186 * Default MAC.
187 * This MAC address will be read from EFI persistent variable if configured.
188 * It can also be reconfigured with standard Linux tools.
189 */
190static u8 mlxbf_tmfifo_net_default_mac[ETH_ALEN] = {
191 0x00, 0x1A, 0xCA, 0xFF, 0xFF, 0x01
192};
193
194/* EFI variable name of the MAC address. */
195static efi_char16_t mlxbf_tmfifo_efi_name[] = L"RshimMacAddr";
196
197/* Maximum L2 header length. */
198#define MLXBF_TMFIFO_NET_L2_OVERHEAD 36
199
200/* Supported virtio-net features. */
201#define MLXBF_TMFIFO_NET_FEATURES \
202 (BIT_ULL(VIRTIO_NET_F_MTU) | BIT_ULL(VIRTIO_NET_F_STATUS) | \
203 BIT_ULL(VIRTIO_NET_F_MAC))
204
205#define mlxbf_vdev_to_tmfifo(d) container_of(d, struct mlxbf_tmfifo_vdev, vdev)
206
207/* Free vrings of the FIFO device. */
208static void mlxbf_tmfifo_free_vrings(struct mlxbf_tmfifo *fifo,
209 struct mlxbf_tmfifo_vdev *tm_vdev)
210{
211 struct mlxbf_tmfifo_vring *vring;
212 int i, size;
213
214 for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) {
215 vring = &tm_vdev->vrings[i];
216 if (vring->va) {
217 size = vring_size(vring->num, vring->align);
218 dma_free_coherent(tm_vdev->vdev.dev.parent, size,
219 vring->va, vring->dma);
220 vring->va = NULL;
221 if (vring->vq) {
222 vring_del_virtqueue(vring->vq);
223 vring->vq = NULL;
224 }
225 }
226 }
227}
228
229/* Allocate vrings for the FIFO. */
230static int mlxbf_tmfifo_alloc_vrings(struct mlxbf_tmfifo *fifo,
231 struct mlxbf_tmfifo_vdev *tm_vdev)
232{
233 struct mlxbf_tmfifo_vring *vring;
234 struct device *dev;
235 dma_addr_t dma;
236 int i, size;
237 void *va;
238
239 for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) {
240 vring = &tm_vdev->vrings[i];
241 vring->fifo = fifo;
242 vring->num = MLXBF_TMFIFO_VRING_SIZE;
243 vring->align = SMP_CACHE_BYTES;
244 vring->index = i;
245 vring->vdev_id = tm_vdev->vdev.id.device;
246 dev = &tm_vdev->vdev.dev;
247
248 size = vring_size(vring->num, vring->align);
249 va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL);
250 if (!va) {
251 mlxbf_tmfifo_free_vrings(fifo, tm_vdev);
252 dev_err(dev->parent, "dma_alloc_coherent failed\n");
253 return -ENOMEM;
254 }
255
256 vring->va = va;
257 vring->dma = dma;
258 }
259
260 return 0;
261}
262
263/* Disable interrupts of the FIFO device. */
264static void mlxbf_tmfifo_disable_irqs(struct mlxbf_tmfifo *fifo)
265{
266 int i, irq;
267
268 for (i = 0; i < MLXBF_TM_MAX_IRQ; i++) {
269 irq = fifo->irq_info[i].irq;
270 fifo->irq_info[i].irq = 0;
271 disable_irq(irq);
272 }
273}
274
275/* Interrupt handler. */
276static irqreturn_t mlxbf_tmfifo_irq_handler(int irq, void *arg)
277{
278 struct mlxbf_tmfifo_irq_info *irq_info = arg;
279
280 if (!test_and_set_bit(irq_info->index, &irq_info->fifo->pend_events))
281 schedule_work(&irq_info->fifo->work);
282
283 return IRQ_HANDLED;
284}
285
286/* Get the next packet descriptor from the vring. */
287static struct vring_desc *
288mlxbf_tmfifo_get_next_desc(struct mlxbf_tmfifo_vring *vring)
289{
290 const struct vring *vr = virtqueue_get_vring(vring->vq);
291 struct virtio_device *vdev = vring->vq->vdev;
292 unsigned int idx, head;
293
294 if (vring->next_avail == virtio16_to_cpu(vdev, vr->avail->idx))
295 return NULL;
296
1c0e5701
LS		 297 /* Make sure 'avail->idx' is visible already. */
298 virtio_rmb(false);
299
1357dfd7
LS		 300 idx = vring->next_avail % vr->num;
301 head = virtio16_to_cpu(vdev, vr->avail->ring[idx]);
302 if (WARN_ON(head >= vr->num))
303 return NULL;
304
305 vring->next_avail++;
306
307 return &vr->desc[head];
308}
309
310/* Release virtio descriptor. */
311static void mlxbf_tmfifo_release_desc(struct mlxbf_tmfifo_vring *vring,
312 struct vring_desc *desc, u32 len)
313{
314 const struct vring *vr = virtqueue_get_vring(vring->vq);
315 struct virtio_device *vdev = vring->vq->vdev;
316 u16 idx, vr_idx;
317
318 vr_idx = virtio16_to_cpu(vdev, vr->used->idx);
319 idx = vr_idx % vr->num;
320 vr->used->ring[idx].id = cpu_to_virtio32(vdev, desc - vr->desc);
321 vr->used->ring[idx].len = cpu_to_virtio32(vdev, len);
322
323 /*
324 * Virtio could poll and check the 'idx' to decide whether the desc is
325 * done or not. Add a memory barrier here to make sure the update above
326 * completes before updating the idx.
327 */
1c0e5701 328 virtio_mb(false);
1357dfd7
LS		 329 vr->used->idx = cpu_to_virtio16(vdev, vr_idx + 1);
330}
331
332/* Get the total length of the descriptor chain. */
333static u32 mlxbf_tmfifo_get_pkt_len(struct mlxbf_tmfifo_vring *vring,
334 struct vring_desc *desc)
335{
336 const struct vring *vr = virtqueue_get_vring(vring->vq);
337 struct virtio_device *vdev = vring->vq->vdev;
338 u32 len = 0, idx;
339
340 while (desc) {
341 len += virtio32_to_cpu(vdev, desc->len);
342 if (!(virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT))
343 break;
344 idx = virtio16_to_cpu(vdev, desc->next);
345 desc = &vr->desc[idx];
346 }
347
348 return len;
349}
350
351static void mlxbf_tmfifo_release_pending_pkt(struct mlxbf_tmfifo_vring *vring)
352{
353 struct vring_desc *desc_head;
354 u32 len = 0;
355
356 if (vring->desc_head) {
357 desc_head = vring->desc_head;
358 len = vring->pkt_len;
359 } else {
360 desc_head = mlxbf_tmfifo_get_next_desc(vring);
361 len = mlxbf_tmfifo_get_pkt_len(vring, desc_head);
362 }
363
364 if (desc_head)
365 mlxbf_tmfifo_release_desc(vring, desc_head, len);
366
367 vring->pkt_len = 0;
368 vring->desc = NULL;
369 vring->desc_head = NULL;
370}
371
372static void mlxbf_tmfifo_init_net_desc(struct mlxbf_tmfifo_vring *vring,
373 struct vring_desc *desc, bool is_rx)
374{
375 struct virtio_device *vdev = vring->vq->vdev;
376 struct virtio_net_hdr *net_hdr;
377
378 net_hdr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr));
379 memset(net_hdr, 0, sizeof(*net_hdr));
380}
381
382/* Get and initialize the next packet. */
383static struct vring_desc *
384mlxbf_tmfifo_get_next_pkt(struct mlxbf_tmfifo_vring *vring, bool is_rx)
385{
386 struct vring_desc *desc;
387
388 desc = mlxbf_tmfifo_get_next_desc(vring);
389 if (desc && is_rx && vring->vdev_id == VIRTIO_ID_NET)
390 mlxbf_tmfifo_init_net_desc(vring, desc, is_rx);
391
392 vring->desc_head = desc;
393 vring->desc = desc;
394
395 return desc;
396}
397
398/* House-keeping timer. */
399static void mlxbf_tmfifo_timer(struct timer_list *t)
400{
401 struct mlxbf_tmfifo *fifo = container_of(t, struct mlxbf_tmfifo, timer);
402 int rx, tx;
403
404 rx = !test_and_set_bit(MLXBF_TM_RX_HWM_IRQ, &fifo->pend_events);
405 tx = !test_and_set_bit(MLXBF_TM_TX_LWM_IRQ, &fifo->pend_events);
406
407 if (rx || tx)
408 schedule_work(&fifo->work);
409
410 mod_timer(&fifo->timer, jiffies + MLXBF_TMFIFO_TIMER_INTERVAL);
411}
412
413/* Copy one console packet into the output buffer. */
414static void mlxbf_tmfifo_console_output_one(struct mlxbf_tmfifo_vdev *cons,
415 struct mlxbf_tmfifo_vring *vring,
416 struct vring_desc *desc)
417{
418 const struct vring *vr = virtqueue_get_vring(vring->vq);
419 struct virtio_device *vdev = &cons->vdev;
420 u32 len, idx, seg;
421 void *addr;
422
423 while (desc) {
424 addr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr));
425 len = virtio32_to_cpu(vdev, desc->len);
426
427 seg = CIRC_SPACE_TO_END(cons->tx_buf.head, cons->tx_buf.tail,
428 MLXBF_TMFIFO_CON_TX_BUF_SIZE);
429 if (len <= seg) {
430 memcpy(cons->tx_buf.buf + cons->tx_buf.head, addr, len);
431 } else {
432 memcpy(cons->tx_buf.buf + cons->tx_buf.head, addr, seg);
433 addr += seg;
434 memcpy(cons->tx_buf.buf, addr, len - seg);
435 }
436 cons->tx_buf.head = (cons->tx_buf.head + len) %
437 MLXBF_TMFIFO_CON_TX_BUF_SIZE;
438
439 if (!(virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT))
440 break;
441 idx = virtio16_to_cpu(vdev, desc->next);
442 desc = &vr->desc[idx];
443 }
444}
445
446/* Copy console data into the output buffer. */
447static void mlxbf_tmfifo_console_output(struct mlxbf_tmfifo_vdev *cons,
448 struct mlxbf_tmfifo_vring *vring)
449{
450 struct vring_desc *desc;
451 u32 len, avail;
452
453 desc = mlxbf_tmfifo_get_next_desc(vring);
454 while (desc) {
455 /* Release the packet if not enough space. */
456 len = mlxbf_tmfifo_get_pkt_len(vring, desc);
457 avail = CIRC_SPACE(cons->tx_buf.head, cons->tx_buf.tail,
458 MLXBF_TMFIFO_CON_TX_BUF_SIZE);
459 if (len + MLXBF_TMFIFO_CON_TX_BUF_RSV_SIZE > avail) {
460 mlxbf_tmfifo_release_desc(vring, desc, len);
461 break;
462 }
463
464 mlxbf_tmfifo_console_output_one(cons, vring, desc);
465 mlxbf_tmfifo_release_desc(vring, desc, len);
466 desc = mlxbf_tmfifo_get_next_desc(vring);
467 }
468}
469
470/* Get the number of available words in Rx FIFO for receiving. */
471static int mlxbf_tmfifo_get_rx_avail(struct mlxbf_tmfifo *fifo)
472{
473 u64 sts;
474
475 sts = readq(fifo->rx_base + MLXBF_TMFIFO_RX_STS);
476 return FIELD_GET(MLXBF_TMFIFO_RX_STS__COUNT_MASK, sts);
477}
478
479/* Get the number of available words in the TmFifo for sending. */
480static int mlxbf_tmfifo_get_tx_avail(struct mlxbf_tmfifo *fifo, int vdev_id)
481{
482 int tx_reserve;
483 u32 count;
484 u64 sts;
485
486 /* Reserve some room in FIFO for console messages. */
487 if (vdev_id == VIRTIO_ID_NET)
488 tx_reserve = fifo->tx_fifo_size / MLXBF_TMFIFO_RESERVE_RATIO;
489 else
490 tx_reserve = 1;
491
492 sts = readq(fifo->tx_base + MLXBF_TMFIFO_TX_STS);
493 count = FIELD_GET(MLXBF_TMFIFO_TX_STS__COUNT_MASK, sts);
494 return fifo->tx_fifo_size - tx_reserve - count;
495}
496
497/* Console Tx (move data from the output buffer into the TmFifo). */
498static void mlxbf_tmfifo_console_tx(struct mlxbf_tmfifo *fifo, int avail)
499{
500 struct mlxbf_tmfifo_msg_hdr hdr;
501 struct mlxbf_tmfifo_vdev *cons;
502 unsigned long flags;
503 int size, seg;
504 void *addr;
505 u64 data;
506
507 /* Return if not enough space available. */
508 if (avail < MLXBF_TMFIFO_DATA_MIN_WORDS)
509 return;
510
511 cons = fifo->vdev[VIRTIO_ID_CONSOLE];
512 if (!cons || !cons->tx_buf.buf)
513 return;
514
515 /* Return if no data to send. */
516 size = CIRC_CNT(cons->tx_buf.head, cons->tx_buf.tail,
517 MLXBF_TMFIFO_CON_TX_BUF_SIZE);
518 if (size == 0)
519 return;
520
521 /* Adjust the size to available space. */
522 if (size + sizeof(hdr) > avail * sizeof(u64))
523 size = avail * sizeof(u64) - sizeof(hdr);
524
525 /* Write header. */
526 hdr.type = VIRTIO_ID_CONSOLE;
527 hdr.len = htons(size);
528 writeq(*(u64 *)&hdr, fifo->tx_base + MLXBF_TMFIFO_TX_DATA);
529
530 /* Use spin-lock to protect the 'cons->tx_buf'. */
638bc4ca 531 spin_lock_irqsave(&fifo->spin_lock[0], flags);
1357dfd7
LS		 532
533 while (size > 0) {
534 addr = cons->tx_buf.buf + cons->tx_buf.tail;
535
536 seg = CIRC_CNT_TO_END(cons->tx_buf.head, cons->tx_buf.tail,
537 MLXBF_TMFIFO_CON_TX_BUF_SIZE);
538 if (seg >= sizeof(u64)) {
539 memcpy(&data, addr, sizeof(u64));
540 } else {
541 memcpy(&data, addr, seg);
542 memcpy((u8 *)&data + seg, cons->tx_buf.buf,
543 sizeof(u64) - seg);
544 }
545 writeq(data, fifo->tx_base + MLXBF_TMFIFO_TX_DATA);
546
547 if (size >= sizeof(u64)) {
548 cons->tx_buf.tail = (cons->tx_buf.tail + sizeof(u64)) %
549 MLXBF_TMFIFO_CON_TX_BUF_SIZE;
550 size -= sizeof(u64);
551 } else {
552 cons->tx_buf.tail = (cons->tx_buf.tail + size) %
553 MLXBF_TMFIFO_CON_TX_BUF_SIZE;
554 size = 0;
555 }
556 }
557
638bc4ca 558 spin_unlock_irqrestore(&fifo->spin_lock[0], flags);
1357dfd7
LS		 559}
560
561/* Rx/Tx one word in the descriptor buffer. */
562static void mlxbf_tmfifo_rxtx_word(struct mlxbf_tmfifo_vring *vring,
563 struct vring_desc *desc,
564 bool is_rx, int len)
565{
566 struct virtio_device *vdev = vring->vq->vdev;
567 struct mlxbf_tmfifo *fifo = vring->fifo;
568 void *addr;
569 u64 data;
570
571 /* Get the buffer address of this desc. */
572 addr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr));
573
574 /* Read a word from FIFO for Rx. */
575 if (is_rx)
576 data = readq(fifo->rx_base + MLXBF_TMFIFO_RX_DATA);
577
578 if (vring->cur_len + sizeof(u64) <= len) {
579 /* The whole word. */
580 if (is_rx)
581 memcpy(addr + vring->cur_len, &data, sizeof(u64));
582 else
583 memcpy(&data, addr + vring->cur_len, sizeof(u64));
584 vring->cur_len += sizeof(u64);
585 } else {
586 /* Leftover bytes. */
587 if (is_rx)
588 memcpy(addr + vring->cur_len, &data,
589 len - vring->cur_len);
590 else
591 memcpy(&data, addr + vring->cur_len,
592 len - vring->cur_len);
593 vring->cur_len = len;
594 }
595
596 /* Write the word into FIFO for Tx. */
597 if (!is_rx)
598 writeq(data, fifo->tx_base + MLXBF_TMFIFO_TX_DATA);
599}
600
601/*
602 * Rx/Tx packet header.
603 *
604 * In Rx case, the packet might be found to belong to a different vring since
605 * the TmFifo is shared by different services. In such case, the 'vring_change'
606 * flag is set.
607 */
608static void mlxbf_tmfifo_rxtx_header(struct mlxbf_tmfifo_vring *vring,
609 struct vring_desc *desc,
610 bool is_rx, bool *vring_change)
611{
612 struct mlxbf_tmfifo *fifo = vring->fifo;
613 struct virtio_net_config *config;
614 struct mlxbf_tmfifo_msg_hdr hdr;
615 int vdev_id, hdr_len;
616
617 /* Read/Write packet header. */
618 if (is_rx) {
619 /* Drain one word from the FIFO. */
620 *(u64 *)&hdr = readq(fifo->rx_base + MLXBF_TMFIFO_RX_DATA);
621
622 /* Skip the length 0 packets (keepalive). */
623 if (hdr.len == 0)
624 return;
625
626 /* Check packet type. */
627 if (hdr.type == VIRTIO_ID_NET) {
628 vdev_id = VIRTIO_ID_NET;
629 hdr_len = sizeof(struct virtio_net_hdr);
630 config = &fifo->vdev[vdev_id]->config.net;
03bea764
MT		 631 /* A legacy-only interface for now. */
632 if (ntohs(hdr.len) >
633 __virtio16_to_cpu(virtio_legacy_is_little_endian(),
634 config->mtu) +
1357dfd7
LS		 635 MLXBF_TMFIFO_NET_L2_OVERHEAD)
636 return;
637 } else {
638 vdev_id = VIRTIO_ID_CONSOLE;
639 hdr_len = 0;
640 }
641
642 /*
643 * Check whether the new packet still belongs to this vring.
644 * If not, update the pkt_len of the new vring.
645 */
646 if (vdev_id != vring->vdev_id) {
647 struct mlxbf_tmfifo_vdev *tm_dev2 = fifo->vdev[vdev_id];
648
649 if (!tm_dev2)
650 return;
651 vring->desc = desc;
652 vring = &tm_dev2->vrings[MLXBF_TMFIFO_VRING_RX];
653 *vring_change = true;
654 }
655 vring->pkt_len = ntohs(hdr.len) + hdr_len;
656 } else {
657 /* Network virtio has an extra header. */
658 hdr_len = (vring->vdev_id == VIRTIO_ID_NET) ?
659 sizeof(struct virtio_net_hdr) : 0;
660 vring->pkt_len = mlxbf_tmfifo_get_pkt_len(vring, desc);
661 hdr.type = (vring->vdev_id == VIRTIO_ID_NET) ?
662 VIRTIO_ID_NET : VIRTIO_ID_CONSOLE;
663 hdr.len = htons(vring->pkt_len - hdr_len);
664 writeq(*(u64 *)&hdr, fifo->tx_base + MLXBF_TMFIFO_TX_DATA);
665 }
666
667 vring->cur_len = hdr_len;
668 vring->rem_len = vring->pkt_len;
669 fifo->vring[is_rx] = vring;
670}
671
672/*
673 * Rx/Tx one descriptor.
674 *
675 * Return true to indicate more data available.
676 */
677static bool mlxbf_tmfifo_rxtx_one_desc(struct mlxbf_tmfifo_vring *vring,
678 bool is_rx, int *avail)
679{
680 const struct vring *vr = virtqueue_get_vring(vring->vq);
681 struct mlxbf_tmfifo *fifo = vring->fifo;
682 struct virtio_device *vdev;
683 bool vring_change = false;
684 struct vring_desc *desc;
685 unsigned long flags;
686 u32 len, idx;
687
688 vdev = &fifo->vdev[vring->vdev_id]->vdev;
689
690 /* Get the descriptor of the next packet. */
691 if (!vring->desc) {
692 desc = mlxbf_tmfifo_get_next_pkt(vring, is_rx);
693 if (!desc)
694 return false;
695 } else {
696 desc = vring->desc;
697 }
698
699 /* Beginning of a packet. Start to Rx/Tx packet header. */
700 if (vring->pkt_len == 0) {
701 mlxbf_tmfifo_rxtx_header(vring, desc, is_rx, &vring_change);
702 (*avail)--;
703
704 /* Return if new packet is for another ring. */
705 if (vring_change)
706 return false;
707 goto mlxbf_tmfifo_desc_done;
708 }
709
710 /* Get the length of this desc. */
711 len = virtio32_to_cpu(vdev, desc->len);
712 if (len > vring->rem_len)
713 len = vring->rem_len;
714
715 /* Rx/Tx one word (8 bytes) if not done. */
716 if (vring->cur_len < len) {
717 mlxbf_tmfifo_rxtx_word(vring, desc, is_rx, len);
718 (*avail)--;
719 }
720
721 /* Check again whether it's done. */
722 if (vring->cur_len == len) {
723 vring->cur_len = 0;
724 vring->rem_len -= len;
725
726 /* Get the next desc on the chain. */
727 if (vring->rem_len > 0 &&
728 (virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT)) {
729 idx = virtio16_to_cpu(vdev, desc->next);
730 desc = &vr->desc[idx];
731 goto mlxbf_tmfifo_desc_done;
732 }
733
734 /* Done and release the pending packet. */
735 mlxbf_tmfifo_release_pending_pkt(vring);
736 desc = NULL;
737 fifo->vring[is_rx] = NULL;
738
1c0e5701
LS		 739 /*
740 * Make sure the load/store are in order before
741 * returning back to virtio.
742 */
743 virtio_mb(false);
744
1357dfd7 745 /* Notify upper layer that packet is done. */
638bc4ca 746 spin_lock_irqsave(&fifo->spin_lock[is_rx], flags);
1357dfd7 747 vring_interrupt(0, vring->vq);
638bc4ca 748 spin_unlock_irqrestore(&fifo->spin_lock[is_rx], flags);
1357dfd7
LS		 749 }
750
751mlxbf_tmfifo_desc_done:
752 /* Save the current desc. */
753 vring->desc = desc;
754
755 return true;
756}
757
758/* Rx & Tx processing of a queue. */
759static void mlxbf_tmfifo_rxtx(struct mlxbf_tmfifo_vring *vring, bool is_rx)
760{
761 int avail = 0, devid = vring->vdev_id;
762 struct mlxbf_tmfifo *fifo;
763 bool more;
764
765 fifo = vring->fifo;
766
767 /* Return if vdev is not ready. */
768 if (!fifo->vdev[devid])
769 return;
770
771 /* Return if another vring is running. */
772 if (fifo->vring[is_rx] && fifo->vring[is_rx] != vring)
773 return;
774
775 /* Only handle console and network for now. */
776 if (WARN_ON(devid != VIRTIO_ID_NET && devid != VIRTIO_ID_CONSOLE))
777 return;
778
779 do {
780 /* Get available FIFO space. */
781 if (avail == 0) {
782 if (is_rx)
783 avail = mlxbf_tmfifo_get_rx_avail(fifo);
784 else
785 avail = mlxbf_tmfifo_get_tx_avail(fifo, devid);
786 if (avail <= 0)
787 break;
788 }
789
790 /* Console output always comes from the Tx buffer. */
791 if (!is_rx && devid == VIRTIO_ID_CONSOLE) {
792 mlxbf_tmfifo_console_tx(fifo, avail);
793 break;
794 }
795
796 /* Handle one descriptor. */
797 more = mlxbf_tmfifo_rxtx_one_desc(vring, is_rx, &avail);
798 } while (more);
799}
800
801/* Handle Rx or Tx queues. */
802static void mlxbf_tmfifo_work_rxtx(struct mlxbf_tmfifo *fifo, int queue_id,
803 int irq_id, bool is_rx)
804{
805 struct mlxbf_tmfifo_vdev *tm_vdev;
806 struct mlxbf_tmfifo_vring *vring;
807 int i;
808
809 if (!test_and_clear_bit(irq_id, &fifo->pend_events) ||
810 !fifo->irq_info[irq_id].irq)
811 return;
812
813 for (i = 0; i < MLXBF_TMFIFO_VDEV_MAX; i++) {
814 tm_vdev = fifo->vdev[i];
815 if (tm_vdev) {
816 vring = &tm_vdev->vrings[queue_id];
817 if (vring->vq)
818 mlxbf_tmfifo_rxtx(vring, is_rx);
819 }
820 }
821}
822
823/* Work handler for Rx and Tx case. */
824static void mlxbf_tmfifo_work_handler(struct work_struct *work)
825{
826 struct mlxbf_tmfifo *fifo;
827
828 fifo = container_of(work, struct mlxbf_tmfifo, work);
829 if (!fifo->is_ready)
830 return;
831
832 mutex_lock(&fifo->lock);
833
834 /* Tx (Send data to the TmFifo). */
835 mlxbf_tmfifo_work_rxtx(fifo, MLXBF_TMFIFO_VRING_TX,
836 MLXBF_TM_TX_LWM_IRQ, false);
837
838 /* Rx (Receive data from the TmFifo). */
839 mlxbf_tmfifo_work_rxtx(fifo, MLXBF_TMFIFO_VRING_RX,
840 MLXBF_TM_RX_HWM_IRQ, true);
841
842 mutex_unlock(&fifo->lock);
843}
844
845/* The notify function is called when new buffers are posted. */
846static bool mlxbf_tmfifo_virtio_notify(struct virtqueue *vq)
847{
848 struct mlxbf_tmfifo_vring *vring = vq->priv;
849 struct mlxbf_tmfifo_vdev *tm_vdev;
850 struct mlxbf_tmfifo *fifo;
851 unsigned long flags;
852
853 fifo = vring->fifo;
854
855 /*
856 * Virtio maintains vrings in pairs, even number ring for Rx
857 * and odd number ring for Tx.
858 */
859 if (vring->index & BIT(0)) {
860 /*
861 * Console could make blocking call with interrupts disabled.
862 * In such case, the vring needs to be served right away. For
863 * other cases, just set the TX LWM bit to start Tx in the
864 * worker handler.
865 */
866 if (vring->vdev_id == VIRTIO_ID_CONSOLE) {
638bc4ca 867 spin_lock_irqsave(&fifo->spin_lock[0], flags);
1357dfd7
LS		 868 tm_vdev = fifo->vdev[VIRTIO_ID_CONSOLE];
869 mlxbf_tmfifo_console_output(tm_vdev, vring);
638bc4ca 870 spin_unlock_irqrestore(&fifo->spin_lock[0], flags);
1357dfd7
LS		 871 } else if (test_and_set_bit(MLXBF_TM_TX_LWM_IRQ,
872 &fifo->pend_events)) {
873 return true;
874 }
875 } else {
876 if (test_and_set_bit(MLXBF_TM_RX_HWM_IRQ, &fifo->pend_events))
877 return true;
878 }
879
880 schedule_work(&fifo->work);
881
882 return true;
883}
884
885/* Get the array of feature bits for this device. */
886static u64 mlxbf_tmfifo_virtio_get_features(struct virtio_device *vdev)
887{
888 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
889
890 return tm_vdev->features;
891}
892
893/* Confirm device features to use. */
894static int mlxbf_tmfifo_virtio_finalize_features(struct virtio_device *vdev)
895{
896 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
897
898 tm_vdev->features = vdev->features;
899
900 return 0;
901}
902
903/* Free virtqueues found by find_vqs(). */
904static void mlxbf_tmfifo_virtio_del_vqs(struct virtio_device *vdev)
905{
906 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
907 struct mlxbf_tmfifo_vring *vring;
908 struct virtqueue *vq;
909 int i;
910
911 for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) {
912 vring = &tm_vdev->vrings[i];
913
914 /* Release the pending packet. */
915 if (vring->desc)
916 mlxbf_tmfifo_release_pending_pkt(vring);
917 vq = vring->vq;
918 if (vq) {
919 vring->vq = NULL;
920 vring_del_virtqueue(vq);
921 }
922 }
923}
924
925/* Create and initialize the virtual queues. */
926static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
927 unsigned int nvqs,
928 struct virtqueue *vqs[],
929 vq_callback_t *callbacks[],
930 const char * const names[],
931 const bool *ctx,
932 struct irq_affinity *desc)
933{
934 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
935 struct mlxbf_tmfifo_vring *vring;
936 struct virtqueue *vq;
937 int i, ret, size;
938
939 if (nvqs > ARRAY_SIZE(tm_vdev->vrings))
940 return -EINVAL;
941
942 for (i = 0; i < nvqs; ++i) {
943 if (!names[i]) {
944 ret = -EINVAL;
945 goto error;
946 }
947 vring = &tm_vdev->vrings[i];
948
949 /* zero vring */
950 size = vring_size(vring->num, vring->align);
951 memset(vring->va, 0, size);
952 vq = vring_new_virtqueue(i, vring->num, vring->align, vdev,
953 false, false, vring->va,
954 mlxbf_tmfifo_virtio_notify,
955 callbacks[i], names[i]);
956 if (!vq) {
957 dev_err(&vdev->dev, "vring_new_virtqueue failed\n");
958 ret = -ENOMEM;
959 goto error;
960 }
961
da802961
XZ		 962 vq->num_max = vring->num;
963
1357dfd7
LS		 964 vqs[i] = vq;
965 vring->vq = vq;
966 vq->priv = vring;
967 }
968
969 return 0;
970
971error:
972 mlxbf_tmfifo_virtio_del_vqs(vdev);
973 return ret;
974}
975
976/* Read the status byte. */
977static u8 mlxbf_tmfifo_virtio_get_status(struct virtio_device *vdev)
978{
979 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
980
981 return tm_vdev->status;
982}
983
984/* Write the status byte. */
985static void mlxbf_tmfifo_virtio_set_status(struct virtio_device *vdev,
986 u8 status)
987{
988 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
989
990 tm_vdev->status = status;
991}
992
993/* Reset the device. Not much here for now. */
994static void mlxbf_tmfifo_virtio_reset(struct virtio_device *vdev)
995{
996 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
997
998 tm_vdev->status = 0;
999}
1000
1001/* Read the value of a configuration field. */
1002static void mlxbf_tmfifo_virtio_get(struct virtio_device *vdev,
1003 unsigned int offset,
1004 void *buf,
1005 unsigned int len)
1006{
1007 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1008
1009 if ((u64)offset + len > sizeof(tm_vdev->config))
1010 return;
1011
1012 memcpy(buf, (u8 *)&tm_vdev->config + offset, len);
1013}
1014
1015/* Write the value of a configuration field. */
1016static void mlxbf_tmfifo_virtio_set(struct virtio_device *vdev,
1017 unsigned int offset,
1018 const void *buf,
1019 unsigned int len)
1020{
1021 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1022
1023 if ((u64)offset + len > sizeof(tm_vdev->config))
1024 return;
1025
1026 memcpy((u8 *)&tm_vdev->config + offset, buf, len);
1027}
1028
1029static void tmfifo_virtio_dev_release(struct device *device)
1030{
1031 struct virtio_device *vdev =
1032 container_of(device, struct virtio_device, dev);
1033 struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
1034
1035 kfree(tm_vdev);
1036}
1037
1038/* Virtio config operations. */
1039static const struct virtio_config_ops mlxbf_tmfifo_virtio_config_ops = {
1040 .get_features = mlxbf_tmfifo_virtio_get_features,
1041 .finalize_features = mlxbf_tmfifo_virtio_finalize_features,
1042 .find_vqs = mlxbf_tmfifo_virtio_find_vqs,
1043 .del_vqs = mlxbf_tmfifo_virtio_del_vqs,
1044 .reset = mlxbf_tmfifo_virtio_reset,
1045 .set_status = mlxbf_tmfifo_virtio_set_status,
1046 .get_status = mlxbf_tmfifo_virtio_get_status,
1047 .get = mlxbf_tmfifo_virtio_get,
1048 .set = mlxbf_tmfifo_virtio_set,
1049};
1050
1051/* Create vdev for the FIFO. */
1052static int mlxbf_tmfifo_create_vdev(struct device *dev,
1053 struct mlxbf_tmfifo *fifo,
1054 int vdev_id, u64 features,
1055 void *config, u32 size)
1056{
1057 struct mlxbf_tmfifo_vdev *tm_vdev, *reg_dev = NULL;
1058 int ret;
1059
1060 mutex_lock(&fifo->lock);
1061
1062 tm_vdev = fifo->vdev[vdev_id];
1063 if (tm_vdev) {
1064 dev_err(dev, "vdev %d already exists\n", vdev_id);
1065 ret = -EEXIST;
1066 goto fail;
1067 }
1068
1069 tm_vdev = kzalloc(sizeof(*tm_vdev), GFP_KERNEL);
1070 if (!tm_vdev) {
1071 ret = -ENOMEM;
1072 goto fail;
1073 }
1074
1075 tm_vdev->vdev.id.device = vdev_id;
1076 tm_vdev->vdev.config = &mlxbf_tmfifo_virtio_config_ops;
1077 tm_vdev->vdev.dev.parent = dev;
1078 tm_vdev->vdev.dev.release = tmfifo_virtio_dev_release;
1079 tm_vdev->features = features;
1080 if (config)
1081 memcpy(&tm_vdev->config, config, size);
1082
1083 if (mlxbf_tmfifo_alloc_vrings(fifo, tm_vdev)) {
1084 dev_err(dev, "unable to allocate vring\n");
1085 ret = -ENOMEM;
1086 goto vdev_fail;
1087 }
1088
1089 /* Allocate an output buffer for the console device. */
1090 if (vdev_id == VIRTIO_ID_CONSOLE)
1091 tm_vdev->tx_buf.buf = devm_kmalloc(dev,
1092 MLXBF_TMFIFO_CON_TX_BUF_SIZE,
1093 GFP_KERNEL);
1094 fifo->vdev[vdev_id] = tm_vdev;
1095
1096 /* Register the virtio device. */
1097 ret = register_virtio_device(&tm_vdev->vdev);
1098 reg_dev = tm_vdev;
1099 if (ret) {
1100 dev_err(dev, "register_virtio_device failed\n");
1101 goto vdev_fail;
1102 }
1103
1104 mutex_unlock(&fifo->lock);
1105 return 0;
1106
1107vdev_fail:
1108 mlxbf_tmfifo_free_vrings(fifo, tm_vdev);
1109 fifo->vdev[vdev_id] = NULL;
1110 if (reg_dev)
1111 put_device(&tm_vdev->vdev.dev);
1112 else
1113 kfree(tm_vdev);
1114fail:
1115 mutex_unlock(&fifo->lock);
1116 return ret;
1117}
1118
1119/* Delete vdev for the FIFO. */
1120static int mlxbf_tmfifo_delete_vdev(struct mlxbf_tmfifo *fifo, int vdev_id)
1121{
1122 struct mlxbf_tmfifo_vdev *tm_vdev;
1123
1124 mutex_lock(&fifo->lock);
1125
1126 /* Unregister vdev. */
1127 tm_vdev = fifo->vdev[vdev_id];
1128 if (tm_vdev) {
1129 unregister_virtio_device(&tm_vdev->vdev);
1130 mlxbf_tmfifo_free_vrings(fifo, tm_vdev);
1131 fifo->vdev[vdev_id] = NULL;
1132 }
1133
1134 mutex_unlock(&fifo->lock);
1135
1136 return 0;
1137}
1138
1139/* Read the configured network MAC address from efi variable. */
1140static void mlxbf_tmfifo_get_cfg_mac(u8 *mac)
1141{
1142 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
1143 unsigned long size = ETH_ALEN;
1144 u8 buf[ETH_ALEN];
1145 efi_status_t rc;
1146
1147 rc = efi.get_variable(mlxbf_tmfifo_efi_name, &guid, NULL, &size, buf);
1148 if (rc == EFI_SUCCESS && size == ETH_ALEN)
1149 ether_addr_copy(mac, buf);
1150 else
1151 ether_addr_copy(mac, mlxbf_tmfifo_net_default_mac);
1152}
1153
1154/* Set TmFifo thresolds which is used to trigger interrupts. */
1155static void mlxbf_tmfifo_set_threshold(struct mlxbf_tmfifo *fifo)
1156{
1157 u64 ctl;
1158
1159 /* Get Tx FIFO size and set the low/high watermark. */
1160 ctl = readq(fifo->tx_base + MLXBF_TMFIFO_TX_CTL);
1161 fifo->tx_fifo_size =
1162 FIELD_GET(MLXBF_TMFIFO_TX_CTL__MAX_ENTRIES_MASK, ctl);
1163 ctl = (ctl & ~MLXBF_TMFIFO_TX_CTL__LWM_MASK) |
1164 FIELD_PREP(MLXBF_TMFIFO_TX_CTL__LWM_MASK,
1165 fifo->tx_fifo_size / 2);
1166 ctl = (ctl & ~MLXBF_TMFIFO_TX_CTL__HWM_MASK) |
1167 FIELD_PREP(MLXBF_TMFIFO_TX_CTL__HWM_MASK,
1168 fifo->tx_fifo_size - 1);
1169 writeq(ctl, fifo->tx_base + MLXBF_TMFIFO_TX_CTL);
1170
1171 /* Get Rx FIFO size and set the low/high watermark. */
1172 ctl = readq(fifo->rx_base + MLXBF_TMFIFO_RX_CTL);
1173 fifo->rx_fifo_size =
1174 FIELD_GET(MLXBF_TMFIFO_RX_CTL__MAX_ENTRIES_MASK, ctl);
1175 ctl = (ctl & ~MLXBF_TMFIFO_RX_CTL__LWM_MASK) |
1176 FIELD_PREP(MLXBF_TMFIFO_RX_CTL__LWM_MASK, 0);
1177 ctl = (ctl & ~MLXBF_TMFIFO_RX_CTL__HWM_MASK) |
1178 FIELD_PREP(MLXBF_TMFIFO_RX_CTL__HWM_MASK, 1);
1179 writeq(ctl, fifo->rx_base + MLXBF_TMFIFO_RX_CTL);
1180}
1181
1182static void mlxbf_tmfifo_cleanup(struct mlxbf_tmfifo *fifo)
1183{
1184 int i;
1185
1186 fifo->is_ready = false;
1187 del_timer_sync(&fifo->timer);
1188 mlxbf_tmfifo_disable_irqs(fifo);
1189 cancel_work_sync(&fifo->work);
1190 for (i = 0; i < MLXBF_TMFIFO_VDEV_MAX; i++)
1191 mlxbf_tmfifo_delete_vdev(fifo, i);
1192}
1193
1194/* Probe the TMFIFO. */
1195static int mlxbf_tmfifo_probe(struct platform_device *pdev)
1196{
1197 struct virtio_net_config net_config;
1198 struct device *dev = &pdev->dev;
1199 struct mlxbf_tmfifo *fifo;
1200 int i, rc;
1201
1202 fifo = devm_kzalloc(dev, sizeof(*fifo), GFP_KERNEL);
1203 if (!fifo)
1204 return -ENOMEM;
1205
638bc4ca
LS		 1206 spin_lock_init(&fifo->spin_lock[0]);
1207 spin_lock_init(&fifo->spin_lock[1]);
1357dfd7
LS		 1208 INIT_WORK(&fifo->work, mlxbf_tmfifo_work_handler);
1209 mutex_init(&fifo->lock);
1210
1211 /* Get the resource of the Rx FIFO. */
1212 fifo->rx_base = devm_platform_ioremap_resource(pdev, 0);
1213 if (IS_ERR(fifo->rx_base))
1214 return PTR_ERR(fifo->rx_base);
1215
1216 /* Get the resource of the Tx FIFO. */
1217 fifo->tx_base = devm_platform_ioremap_resource(pdev, 1);
1218 if (IS_ERR(fifo->tx_base))
1219 return PTR_ERR(fifo->tx_base);
1220
1221 platform_set_drvdata(pdev, fifo);
1222
1223 timer_setup(&fifo->timer, mlxbf_tmfifo_timer, 0);
1224
1225 for (i = 0; i < MLXBF_TM_MAX_IRQ; i++) {
1226 fifo->irq_info[i].index = i;
1227 fifo->irq_info[i].fifo = fifo;
1228 fifo->irq_info[i].irq = platform_get_irq(pdev, i);
1229 rc = devm_request_irq(dev, fifo->irq_info[i].irq,
1230 mlxbf_tmfifo_irq_handler, 0,
1231 "tmfifo", &fifo->irq_info[i]);
1232 if (rc) {
1233 dev_err(dev, "devm_request_irq failed\n");
1234 fifo->irq_info[i].irq = 0;
1235 return rc;
1236 }
1237 }
1238
1239 mlxbf_tmfifo_set_threshold(fifo);
1240
1241 /* Create the console vdev. */
1242 rc = mlxbf_tmfifo_create_vdev(dev, fifo, VIRTIO_ID_CONSOLE, 0, NULL, 0);
1243 if (rc)
1244 goto fail;
1245
1246 /* Create the network vdev. */
1247 memset(&net_config, 0, sizeof(net_config));
03bea764
MT		 1248
1249 /* A legacy-only interface for now. */
1250 net_config.mtu = __cpu_to_virtio16(virtio_legacy_is_little_endian(),
1251 ETH_DATA_LEN);
1252 net_config.status = __cpu_to_virtio16(virtio_legacy_is_little_endian(),
1253 VIRTIO_NET_S_LINK_UP);
1357dfd7
LS		 1254 mlxbf_tmfifo_get_cfg_mac(net_config.mac);
1255 rc = mlxbf_tmfifo_create_vdev(dev, fifo, VIRTIO_ID_NET,
1256 MLXBF_TMFIFO_NET_FEATURES, &net_config,
1257 sizeof(net_config));
1258 if (rc)
1259 goto fail;
1260
1261 mod_timer(&fifo->timer, jiffies + MLXBF_TMFIFO_TIMER_INTERVAL);
1262
1263 fifo->is_ready = true;
1264 return 0;
1265
1266fail:
1267 mlxbf_tmfifo_cleanup(fifo);
1268 return rc;
1269}
1270
1271/* Device remove function. */
1272static int mlxbf_tmfifo_remove(struct platform_device *pdev)
1273{
1274 struct mlxbf_tmfifo *fifo = platform_get_drvdata(pdev);
1275
1276 mlxbf_tmfifo_cleanup(fifo);
1277
1278 return 0;
1279}
1280
1281static const struct acpi_device_id mlxbf_tmfifo_acpi_match[] = {
1282 { "MLNXBF01", 0 },
1283 {}
1284};
1285MODULE_DEVICE_TABLE(acpi, mlxbf_tmfifo_acpi_match);
1286
1287static struct platform_driver mlxbf_tmfifo_driver = {
1288 .probe = mlxbf_tmfifo_probe,
1289 .remove = mlxbf_tmfifo_remove,
1290 .driver = {
1291 .name = "bf-tmfifo",
1292 .acpi_match_table = mlxbf_tmfifo_acpi_match,
1293 },
1294};
1295
1296module_platform_driver(mlxbf_tmfifo_driver);
1297
1298MODULE_DESCRIPTION("Mellanox BlueField SoC TmFifo Driver");
1299MODULE_LICENSE("GPL v2");
1300MODULE_AUTHOR("Mellanox Technologies");
Linux 6.x block layer and io_uring tree(s)