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1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 | // SPDX-License-Identifier: GPL-2.0-only /* * SolidRun DPU driver for control plane * * Copyright (C) 2022-2023 SolidRun * * Author: Alvaro Karsz <alvaro.karsz@solid-run.com> * */ #include <linux/iopoll.h> #include "snet_vdpa.h" /* SNET DPU device ID */ #define SNET_DEVICE_ID 0x1000 /* SNET signature */ #define SNET_SIGNATURE 0xD0D06363 /* Max. config version that we can work with */ #define SNET_CFG_VERSION 0x2 /* Queue align */ #define SNET_QUEUE_ALIGNMENT PAGE_SIZE /* Kick value to notify that new data is available */ #define SNET_KICK_VAL 0x1 #define SNET_CONFIG_OFF 0x0 /* How long we are willing to wait for a SNET device */ #define SNET_DETECT_TIMEOUT 5000000 /* How long should we wait for the DPU to read our config */ #define SNET_READ_CFG_TIMEOUT 3000000 /* Size of configs written to the DPU */ #define SNET_GENERAL_CFG_LEN 36 #define SNET_GENERAL_CFG_VQ_LEN 40 static struct snet *vdpa_to_snet(struct vdpa_device *vdpa) { return container_of(vdpa, struct snet, vdpa); } static irqreturn_t snet_cfg_irq_hndlr(int irq, void *data) { struct snet *snet = data; /* Call callback if any */ if (likely(snet->cb.callback)) return snet->cb.callback(snet->cb.private); return IRQ_HANDLED; } static irqreturn_t snet_vq_irq_hndlr(int irq, void *data) { struct snet_vq *vq = data; /* Call callback if any */ if (likely(vq->cb.callback)) return vq->cb.callback(vq->cb.private); return IRQ_HANDLED; } static void snet_free_irqs(struct snet *snet) { struct psnet *psnet = snet->psnet; struct pci_dev *pdev; u32 i; /* Which Device allcoated the IRQs? */ if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF)) pdev = snet->pdev->physfn; else pdev = snet->pdev; /* Free config's IRQ */ if (snet->cfg_irq != -1) { devm_free_irq(&pdev->dev, snet->cfg_irq, snet); snet->cfg_irq = -1; } /* Free VQ IRQs */ for (i = 0; i < snet->cfg->vq_num; i++) { if (snet->vqs[i] && snet->vqs[i]->irq != -1) { devm_free_irq(&pdev->dev, snet->vqs[i]->irq, snet->vqs[i]); snet->vqs[i]->irq = -1; } } /* IRQ vectors are freed when the pci remove callback is called */ } static int snet_set_vq_address(struct vdpa_device *vdev, u16 idx, u64 desc_area, u64 driver_area, u64 device_area) { struct snet *snet = vdpa_to_snet(vdev); /* save received parameters in vqueue sturct */ snet->vqs[idx]->desc_area = desc_area; snet->vqs[idx]->driver_area = driver_area; snet->vqs[idx]->device_area = device_area; return 0; } static void snet_set_vq_num(struct vdpa_device *vdev, u16 idx, u32 num) { struct snet *snet = vdpa_to_snet(vdev); /* save num in vqueue */ snet->vqs[idx]->num = num; } static void snet_kick_vq(struct vdpa_device *vdev, u16 idx) { struct snet *snet = vdpa_to_snet(vdev); /* not ready - ignore */ if (unlikely(!snet->vqs[idx]->ready)) return; iowrite32(SNET_KICK_VAL, snet->vqs[idx]->kick_ptr); } static void snet_kick_vq_with_data(struct vdpa_device *vdev, u32 data) { struct snet *snet = vdpa_to_snet(vdev); u16 idx = data & 0xFFFF; /* not ready - ignore */ if (unlikely(!snet->vqs[idx]->ready)) return; iowrite32((data & 0xFFFF0000) | SNET_KICK_VAL, snet->vqs[idx]->kick_ptr); } static void snet_set_vq_cb(struct vdpa_device *vdev, u16 idx, struct vdpa_callback *cb) { struct snet *snet = vdpa_to_snet(vdev); snet->vqs[idx]->cb.callback = cb->callback; snet->vqs[idx]->cb.private = cb->private; } static void snet_set_vq_ready(struct vdpa_device *vdev, u16 idx, bool ready) { struct snet *snet = vdpa_to_snet(vdev); snet->vqs[idx]->ready = ready; } static bool snet_get_vq_ready(struct vdpa_device *vdev, u16 idx) { struct snet *snet = vdpa_to_snet(vdev); return snet->vqs[idx]->ready; } static bool snet_vq_state_is_initial(struct snet *snet, const struct vdpa_vq_state *state) { if (SNET_HAS_FEATURE(snet, VIRTIO_F_RING_PACKED)) { const struct vdpa_vq_state_packed *p = &state->packed; if (p->last_avail_counter == 1 && p->last_used_counter == 1 && p->last_avail_idx == 0 && p->last_used_idx == 0) return true; } else { const struct vdpa_vq_state_split *s = &state->split; if (s->avail_index == 0) return true; } return false; } static int snet_set_vq_state(struct vdpa_device *vdev, u16 idx, const struct vdpa_vq_state *state) { struct snet *snet = vdpa_to_snet(vdev); /* We can set any state for config version 2+ */ if (SNET_CFG_VER(snet, 2)) { memcpy(&snet->vqs[idx]->vq_state, state, sizeof(*state)); return 0; } /* Older config - we can't set the VQ state. * Return 0 only if this is the initial state we use in the DPU. */ if (snet_vq_state_is_initial(snet, state)) return 0; return -EOPNOTSUPP; } static int snet_get_vq_state(struct vdpa_device *vdev, u16 idx, struct vdpa_vq_state *state) { struct snet *snet = vdpa_to_snet(vdev); return snet_read_vq_state(snet, idx, state); } static int snet_get_vq_irq(struct vdpa_device *vdev, u16 idx) { struct snet *snet = vdpa_to_snet(vdev); return snet->vqs[idx]->irq; } static u32 snet_get_vq_align(struct vdpa_device *vdev) { return (u32)SNET_QUEUE_ALIGNMENT; } static int snet_reset_dev(struct snet *snet) { struct pci_dev *pdev = snet->pdev; int ret = 0; u32 i; /* If status is 0, nothing to do */ if (!snet->status) return 0; /* If DPU started, destroy it */ if (snet->status & VIRTIO_CONFIG_S_DRIVER_OK) ret = snet_destroy_dev(snet); /* Clear VQs */ for (i = 0; i < snet->cfg->vq_num; i++) { if (!snet->vqs[i]) continue; snet->vqs[i]->cb.callback = NULL; snet->vqs[i]->cb.private = NULL; snet->vqs[i]->desc_area = 0; snet->vqs[i]->device_area = 0; snet->vqs[i]->driver_area = 0; snet->vqs[i]->ready = false; } /* Clear config callback */ snet->cb.callback = NULL; snet->cb.private = NULL; /* Free IRQs */ snet_free_irqs(snet); /* Reset status */ snet->status = 0; snet->dpu_ready = false; if (ret) SNET_WARN(pdev, "Incomplete reset to SNET[%u] device, err: %d\n", snet->sid, ret); else SNET_DBG(pdev, "Reset SNET[%u] device\n", snet->sid); return 0; } static int snet_reset(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); return snet_reset_dev(snet); } static size_t snet_get_config_size(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); return (size_t)snet->cfg->cfg_size; } static u64 snet_get_features(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); return snet->cfg->features; } static int snet_set_drv_features(struct vdpa_device *vdev, u64 features) { struct snet *snet = vdpa_to_snet(vdev); snet->negotiated_features = snet->cfg->features & features; return 0; } static u64 snet_get_drv_features(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); return snet->negotiated_features; } static u16 snet_get_vq_num_max(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); return (u16)snet->cfg->vq_size; } static void snet_set_config_cb(struct vdpa_device *vdev, struct vdpa_callback *cb) { struct snet *snet = vdpa_to_snet(vdev); snet->cb.callback = cb->callback; snet->cb.private = cb->private; } static u32 snet_get_device_id(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); return snet->cfg->virtio_id; } static u32 snet_get_vendor_id(struct vdpa_device *vdev) { return (u32)PCI_VENDOR_ID_SOLIDRUN; } static u8 snet_get_status(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); return snet->status; } static int snet_write_conf(struct snet *snet) { u32 off, i, tmp; int ret; /* No need to write the config twice */ if (snet->dpu_ready) return true; /* Snet data : * * General data: SNET_GENERAL_CFG_LEN bytes long * 0 0x4 0x8 0xC 0x10 0x14 0x1C 0x24 * | MAGIC NUMBER | CFG VER | SNET SID | NUMBER OF QUEUES | IRQ IDX | FEATURES | RSVD | * * For every VQ: SNET_GENERAL_CFG_VQ_LEN bytes long * 0 0x4 0x8 * | VQ SID AND QUEUE SIZE | IRQ Index | * | DESC AREA | * | DEVICE AREA | * | DRIVER AREA | * | VQ STATE (CFG 2+) | RSVD | * * Magic number should be written last, this is the DPU indication that the data is ready */ /* Init offset */ off = snet->psnet->cfg.host_cfg_off; /* Ignore magic number for now */ off += 4; snet_write32(snet, off, snet->psnet->negotiated_cfg_ver); off += 4; snet_write32(snet, off, snet->sid); off += 4; snet_write32(snet, off, snet->cfg->vq_num); off += 4; snet_write32(snet, off, snet->cfg_irq_idx); off += 4; snet_write64(snet, off, snet->negotiated_features); off += 8; /* Ignore reserved */ off += 8; /* Write VQs */ for (i = 0 ; i < snet->cfg->vq_num ; i++) { tmp = (i << 16) | (snet->vqs[i]->num & 0xFFFF); snet_write32(snet, off, tmp); off += 4; snet_write32(snet, off, snet->vqs[i]->irq_idx); off += 4; snet_write64(snet, off, snet->vqs[i]->desc_area); off += 8; snet_write64(snet, off, snet->vqs[i]->device_area); off += 8; snet_write64(snet, off, snet->vqs[i]->driver_area); off += 8; /* Write VQ state if config version is 2+ */ if (SNET_CFG_VER(snet, 2)) snet_write32(snet, off, *(u32 *)&snet->vqs[i]->vq_state); off += 4; /* Ignore reserved */ off += 4; } /* Write magic number - data is ready */ snet_write32(snet, snet->psnet->cfg.host_cfg_off, SNET_SIGNATURE); /* The DPU will ACK the config by clearing the signature */ ret = readx_poll_timeout(ioread32, snet->bar + snet->psnet->cfg.host_cfg_off, tmp, !tmp, 10, SNET_READ_CFG_TIMEOUT); if (ret) { SNET_ERR(snet->pdev, "Timeout waiting for the DPU to read the config\n"); return false; } /* set DPU flag */ snet->dpu_ready = true; return true; } static int snet_request_irqs(struct pci_dev *pdev, struct snet *snet) { int ret, i, irq; /* Request config IRQ */ irq = pci_irq_vector(pdev, snet->cfg_irq_idx); ret = devm_request_irq(&pdev->dev, irq, snet_cfg_irq_hndlr, 0, snet->cfg_irq_name, snet); if (ret) { SNET_ERR(pdev, "Failed to request IRQ\n"); return ret; } snet->cfg_irq = irq; /* Request IRQ for every VQ */ for (i = 0; i < snet->cfg->vq_num; i++) { irq = pci_irq_vector(pdev, snet->vqs[i]->irq_idx); ret = devm_request_irq(&pdev->dev, irq, snet_vq_irq_hndlr, 0, snet->vqs[i]->irq_name, snet->vqs[i]); if (ret) { SNET_ERR(pdev, "Failed to request IRQ\n"); return ret; } snet->vqs[i]->irq = irq; } return 0; } static void snet_set_status(struct vdpa_device *vdev, u8 status) { struct snet *snet = vdpa_to_snet(vdev); struct psnet *psnet = snet->psnet; struct pci_dev *pdev = snet->pdev; int ret; bool pf_irqs; if (status == snet->status) return; if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(snet->status & VIRTIO_CONFIG_S_DRIVER_OK)) { /* Request IRQs */ pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF); ret = snet_request_irqs(pf_irqs ? pdev->physfn : pdev, snet); if (ret) goto set_err; /* Write config to the DPU */ if (snet_write_conf(snet)) { SNET_INFO(pdev, "Create SNET[%u] device\n", snet->sid); } else { snet_free_irqs(snet); goto set_err; } } /* Save the new status */ snet->status = status; return; set_err: snet->status |= VIRTIO_CONFIG_S_FAILED; } static void snet_get_config(struct vdpa_device *vdev, unsigned int offset, void *buf, unsigned int len) { struct snet *snet = vdpa_to_snet(vdev); void __iomem *cfg_ptr = snet->cfg->virtio_cfg + offset; u8 *buf_ptr = buf; u32 i; /* check for offset error */ if (offset + len > snet->cfg->cfg_size) return; /* Write into buffer */ for (i = 0; i < len; i++) *buf_ptr++ = ioread8(cfg_ptr + i); } static void snet_set_config(struct vdpa_device *vdev, unsigned int offset, const void *buf, unsigned int len) { struct snet *snet = vdpa_to_snet(vdev); void __iomem *cfg_ptr = snet->cfg->virtio_cfg + offset; const u8 *buf_ptr = buf; u32 i; /* check for offset error */ if (offset + len > snet->cfg->cfg_size) return; /* Write into PCI BAR */ for (i = 0; i < len; i++) iowrite8(*buf_ptr++, cfg_ptr + i); } static int snet_suspend(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); int ret; ret = snet_suspend_dev(snet); if (ret) SNET_ERR(snet->pdev, "SNET[%u] suspend failed, err: %d\n", snet->sid, ret); else SNET_DBG(snet->pdev, "Suspend SNET[%u] device\n", snet->sid); return ret; } static int snet_resume(struct vdpa_device *vdev) { struct snet *snet = vdpa_to_snet(vdev); int ret; ret = snet_resume_dev(snet); if (ret) SNET_ERR(snet->pdev, "SNET[%u] resume failed, err: %d\n", snet->sid, ret); else SNET_DBG(snet->pdev, "Resume SNET[%u] device\n", snet->sid); return ret; } static const struct vdpa_config_ops snet_config_ops = { .set_vq_address = snet_set_vq_address, .set_vq_num = snet_set_vq_num, .kick_vq = snet_kick_vq, .kick_vq_with_data = snet_kick_vq_with_data, .set_vq_cb = snet_set_vq_cb, .set_vq_ready = snet_set_vq_ready, .get_vq_ready = snet_get_vq_ready, .set_vq_state = snet_set_vq_state, .get_vq_state = snet_get_vq_state, .get_vq_irq = snet_get_vq_irq, .get_vq_align = snet_get_vq_align, .reset = snet_reset, .get_config_size = snet_get_config_size, .get_device_features = snet_get_features, .set_driver_features = snet_set_drv_features, .get_driver_features = snet_get_drv_features, .get_vq_num_min = snet_get_vq_num_max, .get_vq_num_max = snet_get_vq_num_max, .set_config_cb = snet_set_config_cb, .get_device_id = snet_get_device_id, .get_vendor_id = snet_get_vendor_id, .get_status = snet_get_status, .set_status = snet_set_status, .get_config = snet_get_config, .set_config = snet_set_config, .suspend = snet_suspend, .resume = snet_resume, }; static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet) { char name[50]; int ret, i, mask = 0; /* We don't know which BAR will be used to communicate.. * We will map every bar with len > 0. * * Later, we will discover the BAR and unmap all other BARs. */ for (i = 0; i < PCI_STD_NUM_BARS; i++) { if (pci_resource_len(pdev, i)) mask |= (1 << i); } /* No BAR can be used.. */ if (!mask) { SNET_ERR(pdev, "Failed to find a PCI BAR\n"); return -ENODEV; } snprintf(name, sizeof(name), "psnet[%s]-bars", pci_name(pdev)); ret = pcim_iomap_regions(pdev, mask, name); if (ret) { SNET_ERR(pdev, "Failed to request and map PCI BARs\n"); return ret; } for (i = 0; i < PCI_STD_NUM_BARS; i++) { if (mask & (1 << i)) psnet->bars[i] = pcim_iomap_table(pdev)[i]; } return 0; } static int snet_open_vf_bar(struct pci_dev *pdev, struct snet *snet) { char name[50]; int ret; snprintf(name, sizeof(name), "snet[%s]-bar", pci_name(pdev)); /* Request and map BAR */ ret = pcim_iomap_regions(pdev, BIT(snet->psnet->cfg.vf_bar), name); if (ret) { SNET_ERR(pdev, "Failed to request and map PCI BAR for a VF\n"); return ret; } snet->bar = pcim_iomap_table(pdev)[snet->psnet->cfg.vf_bar]; return 0; } static void snet_free_cfg(struct snet_cfg *cfg) { u32 i; if (!cfg->devs) return; /* Free devices */ for (i = 0; i < cfg->devices_num; i++) { if (!cfg->devs[i]) break; kfree(cfg->devs[i]); } /* Free pointers to devices */ kfree(cfg->devs); } /* Detect which BAR is used for communication with the device. */ static int psnet_detect_bar(struct psnet *psnet, u32 off) { unsigned long exit_time; int i; exit_time = jiffies + usecs_to_jiffies(SNET_DETECT_TIMEOUT); /* SNET DPU will write SNET's signature when the config is ready. */ while (time_before(jiffies, exit_time)) { for (i = 0; i < PCI_STD_NUM_BARS; i++) { /* Is this BAR mapped? */ if (!psnet->bars[i]) continue; if (ioread32(psnet->bars[i] + off) == SNET_SIGNATURE) return i; } usleep_range(1000, 10000); } return -ENODEV; } static void psnet_unmap_unused_bars(struct pci_dev *pdev, struct psnet *psnet) { int i, mask = 0; for (i = 0; i < PCI_STD_NUM_BARS; i++) { if (psnet->bars[i] && i != psnet->barno) mask |= (1 << i); } if (mask) pcim_iounmap_regions(pdev, mask); } /* Read SNET config from PCI BAR */ static int psnet_read_cfg(struct pci_dev *pdev, struct psnet *psnet) { struct snet_cfg *cfg = &psnet->cfg; u32 i, off; int barno; /* Move to where the config starts */ off = SNET_CONFIG_OFF; /* Find BAR used for communication */ barno = psnet_detect_bar(psnet, off); if (barno < 0) { SNET_ERR(pdev, "SNET config is not ready.\n"); return barno; } /* Save used BAR number and unmap all other BARs */ psnet->barno = barno; SNET_DBG(pdev, "Using BAR number %d\n", barno); psnet_unmap_unused_bars(pdev, psnet); /* load config from BAR */ cfg->key = psnet_read32(psnet, off); off += 4; cfg->cfg_size = psnet_read32(psnet, off); off += 4; cfg->cfg_ver = psnet_read32(psnet, off); off += 4; /* The negotiated config version is the lower one between this driver's config * and the DPU's. */ psnet->negotiated_cfg_ver = min_t(u32, cfg->cfg_ver, SNET_CFG_VERSION); SNET_DBG(pdev, "SNET config version %u\n", psnet->negotiated_cfg_ver); cfg->vf_num = psnet_read32(psnet, off); off += 4; cfg->vf_bar = psnet_read32(psnet, off); off += 4; cfg->host_cfg_off = psnet_read32(psnet, off); off += 4; cfg->max_size_host_cfg = psnet_read32(psnet, off); off += 4; cfg->virtio_cfg_off = psnet_read32(psnet, off); off += 4; cfg->kick_off = psnet_read32(psnet, off); off += 4; cfg->hwmon_off = psnet_read32(psnet, off); off += 4; cfg->ctrl_off = psnet_read32(psnet, off); off += 4; cfg->flags = psnet_read32(psnet, off); off += 4; /* Ignore Reserved */ off += sizeof(cfg->rsvd); cfg->devices_num = psnet_read32(psnet, off); off += 4; /* Allocate memory to hold pointer to the devices */ cfg->devs = kcalloc(cfg->devices_num, sizeof(void *), GFP_KERNEL); if (!cfg->devs) return -ENOMEM; /* Load device configuration from BAR */ for (i = 0; i < cfg->devices_num; i++) { cfg->devs[i] = kzalloc(sizeof(*cfg->devs[i]), GFP_KERNEL); if (!cfg->devs[i]) { snet_free_cfg(cfg); return -ENOMEM; } /* Read device config */ cfg->devs[i]->virtio_id = psnet_read32(psnet, off); off += 4; cfg->devs[i]->vq_num = psnet_read32(psnet, off); off += 4; cfg->devs[i]->vq_size = psnet_read32(psnet, off); off += 4; cfg->devs[i]->vfid = psnet_read32(psnet, off); off += 4; cfg->devs[i]->features = psnet_read64(psnet, off); off += 8; /* Ignore Reserved */ off += sizeof(cfg->devs[i]->rsvd); cfg->devs[i]->cfg_size = psnet_read32(psnet, off); off += 4; /* Is the config witten to the DPU going to be too big? */ if (SNET_GENERAL_CFG_LEN + SNET_GENERAL_CFG_VQ_LEN * cfg->devs[i]->vq_num > cfg->max_size_host_cfg) { SNET_ERR(pdev, "Failed to read SNET config, the config is too big..\n"); snet_free_cfg(cfg); return -EINVAL; } } return 0; } static int psnet_alloc_irq_vector(struct pci_dev *pdev, struct psnet *psnet) { int ret = 0; u32 i, irq_num = 0; /* Let's count how many IRQs we need, 1 for every VQ + 1 for config change */ for (i = 0; i < psnet->cfg.devices_num; i++) irq_num += psnet->cfg.devs[i]->vq_num + 1; ret = pci_alloc_irq_vectors(pdev, irq_num, irq_num, PCI_IRQ_MSIX); if (ret != irq_num) { SNET_ERR(pdev, "Failed to allocate IRQ vectors\n"); return ret; } SNET_DBG(pdev, "Allocated %u IRQ vectors from physical function\n", irq_num); return 0; } static int snet_alloc_irq_vector(struct pci_dev *pdev, struct snet_dev_cfg *snet_cfg) { int ret = 0; u32 irq_num; /* We want 1 IRQ for every VQ + 1 for config change events */ irq_num = snet_cfg->vq_num + 1; ret = pci_alloc_irq_vectors(pdev, irq_num, irq_num, PCI_IRQ_MSIX); if (ret <= 0) { SNET_ERR(pdev, "Failed to allocate IRQ vectors\n"); return ret; } return 0; } static void snet_free_vqs(struct snet *snet) { u32 i; if (!snet->vqs) return; for (i = 0 ; i < snet->cfg->vq_num ; i++) { if (!snet->vqs[i]) break; kfree(snet->vqs[i]); } kfree(snet->vqs); } static int snet_build_vqs(struct snet *snet) { u32 i; /* Allocate the VQ pointers array */ snet->vqs = kcalloc(snet->cfg->vq_num, sizeof(void *), GFP_KERNEL); if (!snet->vqs) return -ENOMEM; /* Allocate the VQs */ for (i = 0; i < snet->cfg->vq_num; i++) { snet->vqs[i] = kzalloc(sizeof(*snet->vqs[i]), GFP_KERNEL); if (!snet->vqs[i]) { snet_free_vqs(snet); return -ENOMEM; } /* Reset IRQ num */ snet->vqs[i]->irq = -1; /* VQ serial ID */ snet->vqs[i]->sid = i; /* Kick address - every VQ gets 4B */ snet->vqs[i]->kick_ptr = snet->bar + snet->psnet->cfg.kick_off + snet->vqs[i]->sid * 4; /* Clear kick address for this VQ */ iowrite32(0, snet->vqs[i]->kick_ptr); } return 0; } static int psnet_get_next_irq_num(struct psnet *psnet) { int irq; spin_lock(&psnet->lock); irq = psnet->next_irq++; spin_unlock(&psnet->lock); return irq; } static void snet_reserve_irq_idx(struct pci_dev *pdev, struct snet *snet) { struct psnet *psnet = snet->psnet; int i; /* one IRQ for every VQ, and one for config changes */ snet->cfg_irq_idx = psnet_get_next_irq_num(psnet); snprintf(snet->cfg_irq_name, SNET_NAME_SIZE, "snet[%s]-cfg[%d]", pci_name(pdev), snet->cfg_irq_idx); for (i = 0; i < snet->cfg->vq_num; i++) { /* Get next free IRQ ID */ snet->vqs[i]->irq_idx = psnet_get_next_irq_num(psnet); /* Write IRQ name */ snprintf(snet->vqs[i]->irq_name, SNET_NAME_SIZE, "snet[%s]-vq[%d]", pci_name(pdev), snet->vqs[i]->irq_idx); } } /* Find a device config based on virtual function id */ static struct snet_dev_cfg *snet_find_dev_cfg(struct snet_cfg *cfg, u32 vfid) { u32 i; for (i = 0; i < cfg->devices_num; i++) { if (cfg->devs[i]->vfid == vfid) return cfg->devs[i]; } /* Oppss.. no config found.. */ return NULL; } /* Probe function for a physical PCI function */ static int snet_vdpa_probe_pf(struct pci_dev *pdev) { struct psnet *psnet; int ret = 0; bool pf_irqs = false; ret = pcim_enable_device(pdev); if (ret) { SNET_ERR(pdev, "Failed to enable PCI device\n"); return ret; } /* Allocate a PCI physical function device */ psnet = kzalloc(sizeof(*psnet), GFP_KERNEL); if (!psnet) return -ENOMEM; /* Init PSNET spinlock */ spin_lock_init(&psnet->lock); pci_set_master(pdev); pci_set_drvdata(pdev, psnet); /* Open SNET MAIN BAR */ ret = psnet_open_pf_bar(pdev, psnet); if (ret) goto free_psnet; /* Try to read SNET's config from PCI BAR */ ret = psnet_read_cfg(pdev, psnet); if (ret) goto free_psnet; /* If SNET_CFG_FLAG_IRQ_PF flag is set, we should use * PF MSI-X vectors */ pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF); if (pf_irqs) { ret = psnet_alloc_irq_vector(pdev, psnet); if (ret) goto free_cfg; } SNET_DBG(pdev, "Enable %u virtual functions\n", psnet->cfg.vf_num); ret = pci_enable_sriov(pdev, psnet->cfg.vf_num); if (ret) { SNET_ERR(pdev, "Failed to enable SR-IOV\n"); goto free_irq; } /* Create HW monitor device */ if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_HWMON)) { #if IS_ENABLED(CONFIG_HWMON) psnet_create_hwmon(pdev); #else SNET_WARN(pdev, "Can't start HWMON, CONFIG_HWMON is not enabled\n"); #endif } return 0; free_irq: if (pf_irqs) pci_free_irq_vectors(pdev); free_cfg: snet_free_cfg(&psnet->cfg); free_psnet: kfree(psnet); return ret; } /* Probe function for a virtual PCI function */ static int snet_vdpa_probe_vf(struct pci_dev *pdev) { struct pci_dev *pdev_pf = pdev->physfn; struct psnet *psnet = pci_get_drvdata(pdev_pf); struct snet_dev_cfg *dev_cfg; struct snet *snet; u32 vfid; int ret; bool pf_irqs = false; /* Get virtual function id. * (the DPU counts the VFs from 1) */ ret = pci_iov_vf_id(pdev); if (ret < 0) { SNET_ERR(pdev, "Failed to find a VF id\n"); return ret; } vfid = ret + 1; /* Find the snet_dev_cfg based on vfid */ dev_cfg = snet_find_dev_cfg(&psnet->cfg, vfid); if (!dev_cfg) { SNET_WARN(pdev, "Failed to find a VF config..\n"); return -ENODEV; } /* Which PCI device should allocate the IRQs? * If the SNET_CFG_FLAG_IRQ_PF flag set, the PF device allocates the IRQs */ pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF); ret = pcim_enable_device(pdev); if (ret) { SNET_ERR(pdev, "Failed to enable PCI VF device\n"); return ret; } /* Request for MSI-X IRQs */ if (!pf_irqs) { ret = snet_alloc_irq_vector(pdev, dev_cfg); if (ret) return ret; } /* Allocate vdpa device */ snet = vdpa_alloc_device(struct snet, vdpa, &pdev->dev, &snet_config_ops, 1, 1, NULL, false); if (!snet) { SNET_ERR(pdev, "Failed to allocate a vdpa device\n"); ret = -ENOMEM; goto free_irqs; } /* Init control mutex and spinlock */ mutex_init(&snet->ctrl_lock); spin_lock_init(&snet->ctrl_spinlock); /* Save pci device pointer */ snet->pdev = pdev; snet->psnet = psnet; snet->cfg = dev_cfg; snet->dpu_ready = false; snet->sid = vfid; /* Reset IRQ value */ snet->cfg_irq = -1; ret = snet_open_vf_bar(pdev, snet); if (ret) goto put_device; /* Create a VirtIO config pointer */ snet->cfg->virtio_cfg = snet->bar + snet->psnet->cfg.virtio_cfg_off; /* Clear control registers */ snet_ctrl_clear(snet); pci_set_master(pdev); pci_set_drvdata(pdev, snet); ret = snet_build_vqs(snet); if (ret) goto put_device; /* Reserve IRQ indexes, * The IRQs may be requested and freed multiple times, * but the indexes won't change. */ snet_reserve_irq_idx(pf_irqs ? pdev_pf : pdev, snet); /*set DMA device*/ snet->vdpa.dma_dev = &pdev->dev; /* Register VDPA device */ ret = vdpa_register_device(&snet->vdpa, snet->cfg->vq_num); if (ret) { SNET_ERR(pdev, "Failed to register vdpa device\n"); goto free_vqs; } return 0; free_vqs: snet_free_vqs(snet); put_device: put_device(&snet->vdpa.dev); free_irqs: if (!pf_irqs) pci_free_irq_vectors(pdev); return ret; } static int snet_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id) { if (pdev->is_virtfn) return snet_vdpa_probe_vf(pdev); else return snet_vdpa_probe_pf(pdev); } static void snet_vdpa_remove_pf(struct pci_dev *pdev) { struct psnet *psnet = pci_get_drvdata(pdev); pci_disable_sriov(pdev); /* If IRQs are allocated from the PF, we should free the IRQs */ if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF)) pci_free_irq_vectors(pdev); snet_free_cfg(&psnet->cfg); kfree(psnet); } static void snet_vdpa_remove_vf(struct pci_dev *pdev) { struct snet *snet = pci_get_drvdata(pdev); struct psnet *psnet = snet->psnet; vdpa_unregister_device(&snet->vdpa); snet_free_vqs(snet); /* If IRQs are allocated from the VF, we should free the IRQs */ if (!PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF)) pci_free_irq_vectors(pdev); } static void snet_vdpa_remove(struct pci_dev *pdev) { if (pdev->is_virtfn) snet_vdpa_remove_vf(pdev); else snet_vdpa_remove_pf(pdev); } static struct pci_device_id snet_driver_pci_ids[] = { { PCI_DEVICE_SUB(PCI_VENDOR_ID_SOLIDRUN, SNET_DEVICE_ID, PCI_VENDOR_ID_SOLIDRUN, SNET_DEVICE_ID) }, { 0 }, }; MODULE_DEVICE_TABLE(pci, snet_driver_pci_ids); static struct pci_driver snet_vdpa_driver = { .name = "snet-vdpa-driver", .id_table = snet_driver_pci_ids, .probe = snet_vdpa_probe, .remove = snet_vdpa_remove, }; module_pci_driver(snet_vdpa_driver); MODULE_AUTHOR("Alvaro Karsz <alvaro.karsz@solid-run.com>"); MODULE_DESCRIPTION("SolidRun vDPA driver"); MODULE_LICENSE("GPL v2"); |