1 // SPDX-License-Identifier: GPL-2.0-only
3 * SolidRun DPU driver for control plane
5 * Copyright (C) 2022-2023 SolidRun
7 * Author: Alvaro Karsz <alvaro.karsz@solid-run.com>
10 #include <linux/iopoll.h>
12 #include "snet_vdpa.h"
14 /* SNET DPU device ID */
15 #define SNET_DEVICE_ID 0x1000
17 #define SNET_SIGNATURE 0xD0D06363
18 /* Max. config version that we can work with */
19 #define SNET_CFG_VERSION 0x2
21 #define SNET_QUEUE_ALIGNMENT PAGE_SIZE
22 /* Kick value to notify that new data is available */
23 #define SNET_KICK_VAL 0x1
24 #define SNET_CONFIG_OFF 0x0
25 /* How long we are willing to wait for a SNET device */
26 #define SNET_DETECT_TIMEOUT 5000000
27 /* How long should we wait for the DPU to read our config */
28 #define SNET_READ_CFG_TIMEOUT 3000000
29 /* Size of configs written to the DPU */
30 #define SNET_GENERAL_CFG_LEN 36
31 #define SNET_GENERAL_CFG_VQ_LEN 40
33 static struct snet *vdpa_to_snet(struct vdpa_device *vdpa)
35 return container_of(vdpa, struct snet, vdpa);
38 static irqreturn_t snet_cfg_irq_hndlr(int irq, void *data)
40 struct snet *snet = data;
41 /* Call callback if any */
42 if (likely(snet->cb.callback))
43 return snet->cb.callback(snet->cb.private);
48 static irqreturn_t snet_vq_irq_hndlr(int irq, void *data)
50 struct snet_vq *vq = data;
51 /* Call callback if any */
52 if (likely(vq->cb.callback))
53 return vq->cb.callback(vq->cb.private);
58 static void snet_free_irqs(struct snet *snet)
60 struct psnet *psnet = snet->psnet;
64 /* Which Device allcoated the IRQs? */
65 if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF))
66 pdev = snet->pdev->physfn;
70 /* Free config's IRQ */
71 if (snet->cfg_irq != -1) {
72 devm_free_irq(&pdev->dev, snet->cfg_irq, snet);
76 for (i = 0; i < snet->cfg->vq_num; i++) {
77 if (snet->vqs[i] && snet->vqs[i]->irq != -1) {
78 devm_free_irq(&pdev->dev, snet->vqs[i]->irq, snet->vqs[i]);
79 snet->vqs[i]->irq = -1;
83 /* IRQ vectors are freed when the pci remove callback is called */
86 static int snet_set_vq_address(struct vdpa_device *vdev, u16 idx, u64 desc_area,
87 u64 driver_area, u64 device_area)
89 struct snet *snet = vdpa_to_snet(vdev);
90 /* save received parameters in vqueue sturct */
91 snet->vqs[idx]->desc_area = desc_area;
92 snet->vqs[idx]->driver_area = driver_area;
93 snet->vqs[idx]->device_area = device_area;
98 static void snet_set_vq_num(struct vdpa_device *vdev, u16 idx, u32 num)
100 struct snet *snet = vdpa_to_snet(vdev);
101 /* save num in vqueue */
102 snet->vqs[idx]->num = num;
105 static void snet_kick_vq(struct vdpa_device *vdev, u16 idx)
107 struct snet *snet = vdpa_to_snet(vdev);
108 /* not ready - ignore */
109 if (unlikely(!snet->vqs[idx]->ready))
112 iowrite32(SNET_KICK_VAL, snet->vqs[idx]->kick_ptr);
115 static void snet_kick_vq_with_data(struct vdpa_device *vdev, u32 data)
117 struct snet *snet = vdpa_to_snet(vdev);
118 u16 idx = data & 0xFFFF;
120 /* not ready - ignore */
121 if (unlikely(!snet->vqs[idx]->ready))
124 iowrite32((data & 0xFFFF0000) | SNET_KICK_VAL, snet->vqs[idx]->kick_ptr);
127 static void snet_set_vq_cb(struct vdpa_device *vdev, u16 idx, struct vdpa_callback *cb)
129 struct snet *snet = vdpa_to_snet(vdev);
131 snet->vqs[idx]->cb.callback = cb->callback;
132 snet->vqs[idx]->cb.private = cb->private;
135 static void snet_set_vq_ready(struct vdpa_device *vdev, u16 idx, bool ready)
137 struct snet *snet = vdpa_to_snet(vdev);
139 snet->vqs[idx]->ready = ready;
142 static bool snet_get_vq_ready(struct vdpa_device *vdev, u16 idx)
144 struct snet *snet = vdpa_to_snet(vdev);
146 return snet->vqs[idx]->ready;
149 static bool snet_vq_state_is_initial(struct snet *snet, const struct vdpa_vq_state *state)
151 if (SNET_HAS_FEATURE(snet, VIRTIO_F_RING_PACKED)) {
152 const struct vdpa_vq_state_packed *p = &state->packed;
154 if (p->last_avail_counter == 1 && p->last_used_counter == 1 &&
155 p->last_avail_idx == 0 && p->last_used_idx == 0)
158 const struct vdpa_vq_state_split *s = &state->split;
160 if (s->avail_index == 0)
167 static int snet_set_vq_state(struct vdpa_device *vdev, u16 idx, const struct vdpa_vq_state *state)
169 struct snet *snet = vdpa_to_snet(vdev);
171 /* We can set any state for config version 2+ */
172 if (SNET_CFG_VER(snet, 2)) {
173 memcpy(&snet->vqs[idx]->vq_state, state, sizeof(*state));
177 /* Older config - we can't set the VQ state.
178 * Return 0 only if this is the initial state we use in the DPU.
180 if (snet_vq_state_is_initial(snet, state))
186 static int snet_get_vq_state(struct vdpa_device *vdev, u16 idx, struct vdpa_vq_state *state)
188 struct snet *snet = vdpa_to_snet(vdev);
190 return snet_read_vq_state(snet, idx, state);
193 static int snet_get_vq_irq(struct vdpa_device *vdev, u16 idx)
195 struct snet *snet = vdpa_to_snet(vdev);
197 return snet->vqs[idx]->irq;
200 static u32 snet_get_vq_align(struct vdpa_device *vdev)
202 return (u32)SNET_QUEUE_ALIGNMENT;
205 static int snet_reset_dev(struct snet *snet)
207 struct pci_dev *pdev = snet->pdev;
211 /* If status is 0, nothing to do */
215 /* If DPU started, destroy it */
216 if (snet->status & VIRTIO_CONFIG_S_DRIVER_OK)
217 ret = snet_destroy_dev(snet);
220 for (i = 0; i < snet->cfg->vq_num; i++) {
223 snet->vqs[i]->cb.callback = NULL;
224 snet->vqs[i]->cb.private = NULL;
225 snet->vqs[i]->desc_area = 0;
226 snet->vqs[i]->device_area = 0;
227 snet->vqs[i]->driver_area = 0;
228 snet->vqs[i]->ready = false;
231 /* Clear config callback */
232 snet->cb.callback = NULL;
233 snet->cb.private = NULL;
235 snet_free_irqs(snet);
238 snet->dpu_ready = false;
241 SNET_WARN(pdev, "Incomplete reset to SNET[%u] device, err: %d\n", snet->sid, ret);
243 SNET_DBG(pdev, "Reset SNET[%u] device\n", snet->sid);
248 static int snet_reset(struct vdpa_device *vdev)
250 struct snet *snet = vdpa_to_snet(vdev);
252 return snet_reset_dev(snet);
255 static size_t snet_get_config_size(struct vdpa_device *vdev)
257 struct snet *snet = vdpa_to_snet(vdev);
259 return (size_t)snet->cfg->cfg_size;
262 static u64 snet_get_features(struct vdpa_device *vdev)
264 struct snet *snet = vdpa_to_snet(vdev);
266 return snet->cfg->features;
269 static int snet_set_drv_features(struct vdpa_device *vdev, u64 features)
271 struct snet *snet = vdpa_to_snet(vdev);
273 snet->negotiated_features = snet->cfg->features & features;
277 static u64 snet_get_drv_features(struct vdpa_device *vdev)
279 struct snet *snet = vdpa_to_snet(vdev);
281 return snet->negotiated_features;
284 static u16 snet_get_vq_num_max(struct vdpa_device *vdev)
286 struct snet *snet = vdpa_to_snet(vdev);
288 return (u16)snet->cfg->vq_size;
291 static void snet_set_config_cb(struct vdpa_device *vdev, struct vdpa_callback *cb)
293 struct snet *snet = vdpa_to_snet(vdev);
295 snet->cb.callback = cb->callback;
296 snet->cb.private = cb->private;
299 static u32 snet_get_device_id(struct vdpa_device *vdev)
301 struct snet *snet = vdpa_to_snet(vdev);
303 return snet->cfg->virtio_id;
306 static u32 snet_get_vendor_id(struct vdpa_device *vdev)
308 return (u32)PCI_VENDOR_ID_SOLIDRUN;
311 static u8 snet_get_status(struct vdpa_device *vdev)
313 struct snet *snet = vdpa_to_snet(vdev);
318 static int snet_write_conf(struct snet *snet)
323 /* No need to write the config twice */
329 * General data: SNET_GENERAL_CFG_LEN bytes long
330 * 0 0x4 0x8 0xC 0x10 0x14 0x1C 0x24
331 * | MAGIC NUMBER | CFG VER | SNET SID | NUMBER OF QUEUES | IRQ IDX | FEATURES | RSVD |
333 * For every VQ: SNET_GENERAL_CFG_VQ_LEN bytes long
335 * | VQ SID AND QUEUE SIZE | IRQ Index |
339 * | VQ STATE (CFG 2+) | RSVD |
341 * Magic number should be written last, this is the DPU indication that the data is ready
345 off = snet->psnet->cfg.host_cfg_off;
347 /* Ignore magic number for now */
349 snet_write32(snet, off, snet->psnet->negotiated_cfg_ver);
351 snet_write32(snet, off, snet->sid);
353 snet_write32(snet, off, snet->cfg->vq_num);
355 snet_write32(snet, off, snet->cfg_irq_idx);
357 snet_write64(snet, off, snet->negotiated_features);
359 /* Ignore reserved */
362 for (i = 0 ; i < snet->cfg->vq_num ; i++) {
363 tmp = (i << 16) | (snet->vqs[i]->num & 0xFFFF);
364 snet_write32(snet, off, tmp);
366 snet_write32(snet, off, snet->vqs[i]->irq_idx);
368 snet_write64(snet, off, snet->vqs[i]->desc_area);
370 snet_write64(snet, off, snet->vqs[i]->device_area);
372 snet_write64(snet, off, snet->vqs[i]->driver_area);
374 /* Write VQ state if config version is 2+ */
375 if (SNET_CFG_VER(snet, 2))
376 snet_write32(snet, off, *(u32 *)&snet->vqs[i]->vq_state);
379 /* Ignore reserved */
383 /* Write magic number - data is ready */
384 snet_write32(snet, snet->psnet->cfg.host_cfg_off, SNET_SIGNATURE);
386 /* The DPU will ACK the config by clearing the signature */
387 ret = readx_poll_timeout(ioread32, snet->bar + snet->psnet->cfg.host_cfg_off,
388 tmp, !tmp, 10, SNET_READ_CFG_TIMEOUT);
390 SNET_ERR(snet->pdev, "Timeout waiting for the DPU to read the config\n");
395 snet->dpu_ready = true;
400 static int snet_request_irqs(struct pci_dev *pdev, struct snet *snet)
404 /* Request config IRQ */
405 irq = pci_irq_vector(pdev, snet->cfg_irq_idx);
406 ret = devm_request_irq(&pdev->dev, irq, snet_cfg_irq_hndlr, 0,
407 snet->cfg_irq_name, snet);
409 SNET_ERR(pdev, "Failed to request IRQ\n");
414 /* Request IRQ for every VQ */
415 for (i = 0; i < snet->cfg->vq_num; i++) {
416 irq = pci_irq_vector(pdev, snet->vqs[i]->irq_idx);
417 ret = devm_request_irq(&pdev->dev, irq, snet_vq_irq_hndlr, 0,
418 snet->vqs[i]->irq_name, snet->vqs[i]);
420 SNET_ERR(pdev, "Failed to request IRQ\n");
423 snet->vqs[i]->irq = irq;
428 static void snet_set_status(struct vdpa_device *vdev, u8 status)
430 struct snet *snet = vdpa_to_snet(vdev);
431 struct psnet *psnet = snet->psnet;
432 struct pci_dev *pdev = snet->pdev;
436 if (status == snet->status)
439 if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
440 !(snet->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
442 pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF);
443 ret = snet_request_irqs(pf_irqs ? pdev->physfn : pdev, snet);
447 /* Write config to the DPU */
448 if (snet_write_conf(snet)) {
449 SNET_INFO(pdev, "Create SNET[%u] device\n", snet->sid);
451 snet_free_irqs(snet);
456 /* Save the new status */
457 snet->status = status;
461 snet->status |= VIRTIO_CONFIG_S_FAILED;
464 static void snet_get_config(struct vdpa_device *vdev, unsigned int offset,
465 void *buf, unsigned int len)
467 struct snet *snet = vdpa_to_snet(vdev);
468 void __iomem *cfg_ptr = snet->cfg->virtio_cfg + offset;
472 /* check for offset error */
473 if (offset + len > snet->cfg->cfg_size)
476 /* Write into buffer */
477 for (i = 0; i < len; i++)
478 *buf_ptr++ = ioread8(cfg_ptr + i);
481 static void snet_set_config(struct vdpa_device *vdev, unsigned int offset,
482 const void *buf, unsigned int len)
484 struct snet *snet = vdpa_to_snet(vdev);
485 void __iomem *cfg_ptr = snet->cfg->virtio_cfg + offset;
486 const u8 *buf_ptr = buf;
489 /* check for offset error */
490 if (offset + len > snet->cfg->cfg_size)
493 /* Write into PCI BAR */
494 for (i = 0; i < len; i++)
495 iowrite8(*buf_ptr++, cfg_ptr + i);
498 static int snet_suspend(struct vdpa_device *vdev)
500 struct snet *snet = vdpa_to_snet(vdev);
503 ret = snet_suspend_dev(snet);
505 SNET_ERR(snet->pdev, "SNET[%u] suspend failed, err: %d\n", snet->sid, ret);
507 SNET_DBG(snet->pdev, "Suspend SNET[%u] device\n", snet->sid);
512 static int snet_resume(struct vdpa_device *vdev)
514 struct snet *snet = vdpa_to_snet(vdev);
517 ret = snet_resume_dev(snet);
519 SNET_ERR(snet->pdev, "SNET[%u] resume failed, err: %d\n", snet->sid, ret);
521 SNET_DBG(snet->pdev, "Resume SNET[%u] device\n", snet->sid);
526 static const struct vdpa_config_ops snet_config_ops = {
527 .set_vq_address = snet_set_vq_address,
528 .set_vq_num = snet_set_vq_num,
529 .kick_vq = snet_kick_vq,
530 .kick_vq_with_data = snet_kick_vq_with_data,
531 .set_vq_cb = snet_set_vq_cb,
532 .set_vq_ready = snet_set_vq_ready,
533 .get_vq_ready = snet_get_vq_ready,
534 .set_vq_state = snet_set_vq_state,
535 .get_vq_state = snet_get_vq_state,
536 .get_vq_irq = snet_get_vq_irq,
537 .get_vq_align = snet_get_vq_align,
539 .get_config_size = snet_get_config_size,
540 .get_device_features = snet_get_features,
541 .set_driver_features = snet_set_drv_features,
542 .get_driver_features = snet_get_drv_features,
543 .get_vq_num_min = snet_get_vq_num_max,
544 .get_vq_num_max = snet_get_vq_num_max,
545 .set_config_cb = snet_set_config_cb,
546 .get_device_id = snet_get_device_id,
547 .get_vendor_id = snet_get_vendor_id,
548 .get_status = snet_get_status,
549 .set_status = snet_set_status,
550 .get_config = snet_get_config,
551 .set_config = snet_set_config,
552 .suspend = snet_suspend,
553 .resume = snet_resume,
556 static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet)
559 int ret, i, mask = 0;
560 /* We don't know which BAR will be used to communicate..
561 * We will map every bar with len > 0.
563 * Later, we will discover the BAR and unmap all other BARs.
565 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
566 if (pci_resource_len(pdev, i))
570 /* No BAR can be used.. */
572 SNET_ERR(pdev, "Failed to find a PCI BAR\n");
576 snprintf(name, sizeof(name), "psnet[%s]-bars", pci_name(pdev));
577 ret = pcim_iomap_regions(pdev, mask, name);
579 SNET_ERR(pdev, "Failed to request and map PCI BARs\n");
583 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
585 psnet->bars[i] = pcim_iomap_table(pdev)[i];
591 static int snet_open_vf_bar(struct pci_dev *pdev, struct snet *snet)
596 snprintf(name, sizeof(name), "snet[%s]-bar", pci_name(pdev));
597 /* Request and map BAR */
598 ret = pcim_iomap_regions(pdev, BIT(snet->psnet->cfg.vf_bar), name);
600 SNET_ERR(pdev, "Failed to request and map PCI BAR for a VF\n");
604 snet->bar = pcim_iomap_table(pdev)[snet->psnet->cfg.vf_bar];
609 static void snet_free_cfg(struct snet_cfg *cfg)
617 for (i = 0; i < cfg->devices_num; i++) {
623 /* Free pointers to devices */
627 /* Detect which BAR is used for communication with the device. */
628 static int psnet_detect_bar(struct psnet *psnet, u32 off)
630 unsigned long exit_time;
633 exit_time = jiffies + usecs_to_jiffies(SNET_DETECT_TIMEOUT);
635 /* SNET DPU will write SNET's signature when the config is ready. */
636 while (time_before(jiffies, exit_time)) {
637 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
638 /* Is this BAR mapped? */
642 if (ioread32(psnet->bars[i] + off) == SNET_SIGNATURE)
645 usleep_range(1000, 10000);
651 static void psnet_unmap_unused_bars(struct pci_dev *pdev, struct psnet *psnet)
655 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
656 if (psnet->bars[i] && i != psnet->barno)
661 pcim_iounmap_regions(pdev, mask);
664 /* Read SNET config from PCI BAR */
665 static int psnet_read_cfg(struct pci_dev *pdev, struct psnet *psnet)
667 struct snet_cfg *cfg = &psnet->cfg;
671 /* Move to where the config starts */
672 off = SNET_CONFIG_OFF;
674 /* Find BAR used for communication */
675 barno = psnet_detect_bar(psnet, off);
677 SNET_ERR(pdev, "SNET config is not ready.\n");
681 /* Save used BAR number and unmap all other BARs */
682 psnet->barno = barno;
683 SNET_DBG(pdev, "Using BAR number %d\n", barno);
685 psnet_unmap_unused_bars(pdev, psnet);
687 /* load config from BAR */
688 cfg->key = psnet_read32(psnet, off);
690 cfg->cfg_size = psnet_read32(psnet, off);
692 cfg->cfg_ver = psnet_read32(psnet, off);
694 /* The negotiated config version is the lower one between this driver's config
697 psnet->negotiated_cfg_ver = min_t(u32, cfg->cfg_ver, SNET_CFG_VERSION);
698 SNET_DBG(pdev, "SNET config version %u\n", psnet->negotiated_cfg_ver);
700 cfg->vf_num = psnet_read32(psnet, off);
702 cfg->vf_bar = psnet_read32(psnet, off);
704 cfg->host_cfg_off = psnet_read32(psnet, off);
706 cfg->max_size_host_cfg = psnet_read32(psnet, off);
708 cfg->virtio_cfg_off = psnet_read32(psnet, off);
710 cfg->kick_off = psnet_read32(psnet, off);
712 cfg->hwmon_off = psnet_read32(psnet, off);
714 cfg->ctrl_off = psnet_read32(psnet, off);
716 cfg->flags = psnet_read32(psnet, off);
718 /* Ignore Reserved */
719 off += sizeof(cfg->rsvd);
721 cfg->devices_num = psnet_read32(psnet, off);
723 /* Allocate memory to hold pointer to the devices */
724 cfg->devs = kcalloc(cfg->devices_num, sizeof(void *), GFP_KERNEL);
728 /* Load device configuration from BAR */
729 for (i = 0; i < cfg->devices_num; i++) {
730 cfg->devs[i] = kzalloc(sizeof(*cfg->devs[i]), GFP_KERNEL);
735 /* Read device config */
736 cfg->devs[i]->virtio_id = psnet_read32(psnet, off);
738 cfg->devs[i]->vq_num = psnet_read32(psnet, off);
740 cfg->devs[i]->vq_size = psnet_read32(psnet, off);
742 cfg->devs[i]->vfid = psnet_read32(psnet, off);
744 cfg->devs[i]->features = psnet_read64(psnet, off);
746 /* Ignore Reserved */
747 off += sizeof(cfg->devs[i]->rsvd);
749 cfg->devs[i]->cfg_size = psnet_read32(psnet, off);
752 /* Is the config witten to the DPU going to be too big? */
753 if (SNET_GENERAL_CFG_LEN + SNET_GENERAL_CFG_VQ_LEN * cfg->devs[i]->vq_num >
754 cfg->max_size_host_cfg) {
755 SNET_ERR(pdev, "Failed to read SNET config, the config is too big..\n");
763 static int psnet_alloc_irq_vector(struct pci_dev *pdev, struct psnet *psnet)
768 /* Let's count how many IRQs we need, 1 for every VQ + 1 for config change */
769 for (i = 0; i < psnet->cfg.devices_num; i++)
770 irq_num += psnet->cfg.devs[i]->vq_num + 1;
772 ret = pci_alloc_irq_vectors(pdev, irq_num, irq_num, PCI_IRQ_MSIX);
773 if (ret != irq_num) {
774 SNET_ERR(pdev, "Failed to allocate IRQ vectors\n");
777 SNET_DBG(pdev, "Allocated %u IRQ vectors from physical function\n", irq_num);
782 static int snet_alloc_irq_vector(struct pci_dev *pdev, struct snet_dev_cfg *snet_cfg)
787 /* We want 1 IRQ for every VQ + 1 for config change events */
788 irq_num = snet_cfg->vq_num + 1;
790 ret = pci_alloc_irq_vectors(pdev, irq_num, irq_num, PCI_IRQ_MSIX);
792 SNET_ERR(pdev, "Failed to allocate IRQ vectors\n");
799 static void snet_free_vqs(struct snet *snet)
806 for (i = 0 ; i < snet->cfg->vq_num ; i++) {
815 static int snet_build_vqs(struct snet *snet)
818 /* Allocate the VQ pointers array */
819 snet->vqs = kcalloc(snet->cfg->vq_num, sizeof(void *), GFP_KERNEL);
823 /* Allocate the VQs */
824 for (i = 0; i < snet->cfg->vq_num; i++) {
825 snet->vqs[i] = kzalloc(sizeof(*snet->vqs[i]), GFP_KERNEL);
831 snet->vqs[i]->irq = -1;
833 snet->vqs[i]->sid = i;
834 /* Kick address - every VQ gets 4B */
835 snet->vqs[i]->kick_ptr = snet->bar + snet->psnet->cfg.kick_off +
836 snet->vqs[i]->sid * 4;
837 /* Clear kick address for this VQ */
838 iowrite32(0, snet->vqs[i]->kick_ptr);
843 static int psnet_get_next_irq_num(struct psnet *psnet)
847 spin_lock(&psnet->lock);
848 irq = psnet->next_irq++;
849 spin_unlock(&psnet->lock);
854 static void snet_reserve_irq_idx(struct pci_dev *pdev, struct snet *snet)
856 struct psnet *psnet = snet->psnet;
859 /* one IRQ for every VQ, and one for config changes */
860 snet->cfg_irq_idx = psnet_get_next_irq_num(psnet);
861 snprintf(snet->cfg_irq_name, SNET_NAME_SIZE, "snet[%s]-cfg[%d]",
862 pci_name(pdev), snet->cfg_irq_idx);
864 for (i = 0; i < snet->cfg->vq_num; i++) {
865 /* Get next free IRQ ID */
866 snet->vqs[i]->irq_idx = psnet_get_next_irq_num(psnet);
868 snprintf(snet->vqs[i]->irq_name, SNET_NAME_SIZE, "snet[%s]-vq[%d]",
869 pci_name(pdev), snet->vqs[i]->irq_idx);
873 /* Find a device config based on virtual function id */
874 static struct snet_dev_cfg *snet_find_dev_cfg(struct snet_cfg *cfg, u32 vfid)
878 for (i = 0; i < cfg->devices_num; i++) {
879 if (cfg->devs[i]->vfid == vfid)
882 /* Oppss.. no config found.. */
886 /* Probe function for a physical PCI function */
887 static int snet_vdpa_probe_pf(struct pci_dev *pdev)
891 bool pf_irqs = false;
893 ret = pcim_enable_device(pdev);
895 SNET_ERR(pdev, "Failed to enable PCI device\n");
899 /* Allocate a PCI physical function device */
900 psnet = kzalloc(sizeof(*psnet), GFP_KERNEL);
904 /* Init PSNET spinlock */
905 spin_lock_init(&psnet->lock);
907 pci_set_master(pdev);
908 pci_set_drvdata(pdev, psnet);
910 /* Open SNET MAIN BAR */
911 ret = psnet_open_pf_bar(pdev, psnet);
915 /* Try to read SNET's config from PCI BAR */
916 ret = psnet_read_cfg(pdev, psnet);
920 /* If SNET_CFG_FLAG_IRQ_PF flag is set, we should use
923 pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF);
926 ret = psnet_alloc_irq_vector(pdev, psnet);
931 SNET_DBG(pdev, "Enable %u virtual functions\n", psnet->cfg.vf_num);
932 ret = pci_enable_sriov(pdev, psnet->cfg.vf_num);
934 SNET_ERR(pdev, "Failed to enable SR-IOV\n");
938 /* Create HW monitor device */
939 if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_HWMON)) {
940 #if IS_ENABLED(CONFIG_HWMON)
941 psnet_create_hwmon(pdev);
943 SNET_WARN(pdev, "Can't start HWMON, CONFIG_HWMON is not enabled\n");
951 pci_free_irq_vectors(pdev);
953 snet_free_cfg(&psnet->cfg);
959 /* Probe function for a virtual PCI function */
960 static int snet_vdpa_probe_vf(struct pci_dev *pdev)
962 struct pci_dev *pdev_pf = pdev->physfn;
963 struct psnet *psnet = pci_get_drvdata(pdev_pf);
964 struct snet_dev_cfg *dev_cfg;
968 bool pf_irqs = false;
970 /* Get virtual function id.
971 * (the DPU counts the VFs from 1)
973 ret = pci_iov_vf_id(pdev);
975 SNET_ERR(pdev, "Failed to find a VF id\n");
980 /* Find the snet_dev_cfg based on vfid */
981 dev_cfg = snet_find_dev_cfg(&psnet->cfg, vfid);
983 SNET_WARN(pdev, "Failed to find a VF config..\n");
987 /* Which PCI device should allocate the IRQs?
988 * If the SNET_CFG_FLAG_IRQ_PF flag set, the PF device allocates the IRQs
990 pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF);
992 ret = pcim_enable_device(pdev);
994 SNET_ERR(pdev, "Failed to enable PCI VF device\n");
998 /* Request for MSI-X IRQs */
1000 ret = snet_alloc_irq_vector(pdev, dev_cfg);
1005 /* Allocate vdpa device */
1006 snet = vdpa_alloc_device(struct snet, vdpa, &pdev->dev, &snet_config_ops, 1, 1, NULL,
1009 SNET_ERR(pdev, "Failed to allocate a vdpa device\n");
1014 /* Init control mutex and spinlock */
1015 mutex_init(&snet->ctrl_lock);
1016 spin_lock_init(&snet->ctrl_spinlock);
1018 /* Save pci device pointer */
1020 snet->psnet = psnet;
1021 snet->cfg = dev_cfg;
1022 snet->dpu_ready = false;
1024 /* Reset IRQ value */
1027 ret = snet_open_vf_bar(pdev, snet);
1031 /* Create a VirtIO config pointer */
1032 snet->cfg->virtio_cfg = snet->bar + snet->psnet->cfg.virtio_cfg_off;
1034 /* Clear control registers */
1035 snet_ctrl_clear(snet);
1037 pci_set_master(pdev);
1038 pci_set_drvdata(pdev, snet);
1040 ret = snet_build_vqs(snet);
1044 /* Reserve IRQ indexes,
1045 * The IRQs may be requested and freed multiple times,
1046 * but the indexes won't change.
1048 snet_reserve_irq_idx(pf_irqs ? pdev_pf : pdev, snet);
1051 snet->vdpa.dma_dev = &pdev->dev;
1053 /* Register VDPA device */
1054 ret = vdpa_register_device(&snet->vdpa, snet->cfg->vq_num);
1056 SNET_ERR(pdev, "Failed to register vdpa device\n");
1063 snet_free_vqs(snet);
1065 put_device(&snet->vdpa.dev);
1068 pci_free_irq_vectors(pdev);
1072 static int snet_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1074 if (pdev->is_virtfn)
1075 return snet_vdpa_probe_vf(pdev);
1077 return snet_vdpa_probe_pf(pdev);
1080 static void snet_vdpa_remove_pf(struct pci_dev *pdev)
1082 struct psnet *psnet = pci_get_drvdata(pdev);
1084 pci_disable_sriov(pdev);
1085 /* If IRQs are allocated from the PF, we should free the IRQs */
1086 if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF))
1087 pci_free_irq_vectors(pdev);
1089 snet_free_cfg(&psnet->cfg);
1093 static void snet_vdpa_remove_vf(struct pci_dev *pdev)
1095 struct snet *snet = pci_get_drvdata(pdev);
1096 struct psnet *psnet = snet->psnet;
1098 vdpa_unregister_device(&snet->vdpa);
1099 snet_free_vqs(snet);
1100 /* If IRQs are allocated from the VF, we should free the IRQs */
1101 if (!PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF))
1102 pci_free_irq_vectors(pdev);
1105 static void snet_vdpa_remove(struct pci_dev *pdev)
1107 if (pdev->is_virtfn)
1108 snet_vdpa_remove_vf(pdev);
1110 snet_vdpa_remove_pf(pdev);
1113 static struct pci_device_id snet_driver_pci_ids[] = {
1114 { PCI_DEVICE_SUB(PCI_VENDOR_ID_SOLIDRUN, SNET_DEVICE_ID,
1115 PCI_VENDOR_ID_SOLIDRUN, SNET_DEVICE_ID) },
1119 MODULE_DEVICE_TABLE(pci, snet_driver_pci_ids);
1121 static struct pci_driver snet_vdpa_driver = {
1122 .name = "snet-vdpa-driver",
1123 .id_table = snet_driver_pci_ids,
1124 .probe = snet_vdpa_probe,
1125 .remove = snet_vdpa_remove,
1128 module_pci_driver(snet_vdpa_driver);
1130 MODULE_AUTHOR("Alvaro Karsz <alvaro.karsz@solid-run.com>");
1131 MODULE_DESCRIPTION("SolidRun vDPA driver");
1132 MODULE_LICENSE("GPL v2");