| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Mellanox BlueField SoC TmFifo driver |
| * |
| * Copyright (C) 2019 Mellanox Technologies |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/bitfield.h> |
| #include <linux/circ_buf.h> |
| #include <linux/efi.h> |
| #include <linux/irq.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <linux/platform_device.h> |
| #include <linux/types.h> |
| |
| #include <linux/virtio_config.h> |
| #include <linux/virtio_console.h> |
| #include <linux/virtio_ids.h> |
| #include <linux/virtio_net.h> |
| #include <linux/virtio_ring.h> |
| |
| #include "mlxbf-tmfifo-regs.h" |
| |
| /* Vring size. */ |
| #define MLXBF_TMFIFO_VRING_SIZE SZ_1K |
| |
| /* Console Tx buffer size. */ |
| #define MLXBF_TMFIFO_CON_TX_BUF_SIZE SZ_32K |
| |
| /* Console Tx buffer reserved space. */ |
| #define MLXBF_TMFIFO_CON_TX_BUF_RSV_SIZE 8 |
| |
| /* House-keeping timer interval. */ |
| #define MLXBF_TMFIFO_TIMER_INTERVAL (HZ / 10) |
| |
| /* Virtual devices sharing the TM FIFO. */ |
| #define MLXBF_TMFIFO_VDEV_MAX (VIRTIO_ID_CONSOLE + 1) |
| |
| /* |
| * Reserve 1/16 of TmFifo space, so console messages are not starved by |
| * the networking traffic. |
| */ |
| #define MLXBF_TMFIFO_RESERVE_RATIO 16 |
| |
| /* Message with data needs at least two words (for header & data). */ |
| #define MLXBF_TMFIFO_DATA_MIN_WORDS 2 |
| |
| struct mlxbf_tmfifo; |
| |
| /** |
| * mlxbf_tmfifo_vring - Structure of the TmFifo virtual ring |
| * @va: virtual address of the ring |
| * @dma: dma address of the ring |
| * @vq: pointer to the virtio virtqueue |
| * @desc: current descriptor of the pending packet |
| * @desc_head: head descriptor of the pending packet |
| * @drop_desc: dummy desc for packet dropping |
| * @cur_len: processed length of the current descriptor |
| * @rem_len: remaining length of the pending packet |
| * @pkt_len: total length of the pending packet |
| * @next_avail: next avail descriptor id |
| * @num: vring size (number of descriptors) |
| * @align: vring alignment size |
| * @index: vring index |
| * @vdev_id: vring virtio id (VIRTIO_ID_xxx) |
| * @fifo: pointer to the tmfifo structure |
| */ |
| struct mlxbf_tmfifo_vring { |
| void *va; |
| dma_addr_t dma; |
| struct virtqueue *vq; |
| struct vring_desc *desc; |
| struct vring_desc *desc_head; |
| struct vring_desc drop_desc; |
| int cur_len; |
| int rem_len; |
| u32 pkt_len; |
| u16 next_avail; |
| int num; |
| int align; |
| int index; |
| int vdev_id; |
| struct mlxbf_tmfifo *fifo; |
| }; |
| |
| /* Check whether vring is in drop mode. */ |
| #define IS_VRING_DROP(_r) ({ \ |
| typeof(_r) (r) = (_r); \ |
| (r->desc_head == &r->drop_desc ? true : false); }) |
| |
| /* A stub length to drop maximum length packet. */ |
| #define VRING_DROP_DESC_MAX_LEN GENMASK(15, 0) |
| |
| /* Interrupt types. */ |
| enum { |
| MLXBF_TM_RX_LWM_IRQ, |
| MLXBF_TM_RX_HWM_IRQ, |
| MLXBF_TM_TX_LWM_IRQ, |
| MLXBF_TM_TX_HWM_IRQ, |
| MLXBF_TM_MAX_IRQ |
| }; |
| |
| /* Ring types (Rx & Tx). */ |
| enum { |
| MLXBF_TMFIFO_VRING_RX, |
| MLXBF_TMFIFO_VRING_TX, |
| MLXBF_TMFIFO_VRING_MAX |
| }; |
| |
| /** |
| * mlxbf_tmfifo_vdev - Structure of the TmFifo virtual device |
| * @vdev: virtio device, in which the vdev.id.device field has the |
| * VIRTIO_ID_xxx id to distinguish the virtual device. |
| * @status: status of the device |
| * @features: supported features of the device |
| * @vrings: array of tmfifo vrings of this device |
| * @config.cons: virtual console config - |
| * select if vdev.id.device is VIRTIO_ID_CONSOLE |
| * @config.net: virtual network config - |
| * select if vdev.id.device is VIRTIO_ID_NET |
| * @tx_buf: tx buffer used to buffer data before writing into the FIFO |
| */ |
| struct mlxbf_tmfifo_vdev { |
| struct virtio_device vdev; |
| u8 status; |
| u64 features; |
| struct mlxbf_tmfifo_vring vrings[MLXBF_TMFIFO_VRING_MAX]; |
| union { |
| struct virtio_console_config cons; |
| struct virtio_net_config net; |
| } config; |
| struct circ_buf tx_buf; |
| }; |
| |
| /** |
| * mlxbf_tmfifo_irq_info - Structure of the interrupt information |
| * @fifo: pointer to the tmfifo structure |
| * @irq: interrupt number |
| * @index: index into the interrupt array |
| */ |
| struct mlxbf_tmfifo_irq_info { |
| struct mlxbf_tmfifo *fifo; |
| int irq; |
| int index; |
| }; |
| |
| /** |
| * mlxbf_tmfifo - Structure of the TmFifo |
| * @vdev: array of the virtual devices running over the TmFifo |
| * @lock: lock to protect the TmFifo access |
| * @rx_base: mapped register base address for the Rx FIFO |
| * @tx_base: mapped register base address for the Tx FIFO |
| * @rx_fifo_size: number of entries of the Rx FIFO |
| * @tx_fifo_size: number of entries of the Tx FIFO |
| * @pend_events: pending bits for deferred events |
| * @irq_info: interrupt information |
| * @work: work struct for deferred process |
| * @timer: background timer |
| * @vring: Tx/Rx ring |
| * @spin_lock: Tx/Rx spin lock |
| * @is_ready: ready flag |
| */ |
| struct mlxbf_tmfifo { |
| struct mlxbf_tmfifo_vdev *vdev[MLXBF_TMFIFO_VDEV_MAX]; |
| struct mutex lock; /* TmFifo lock */ |
| void __iomem *rx_base; |
| void __iomem *tx_base; |
| int rx_fifo_size; |
| int tx_fifo_size; |
| unsigned long pend_events; |
| struct mlxbf_tmfifo_irq_info irq_info[MLXBF_TM_MAX_IRQ]; |
| struct work_struct work; |
| struct timer_list timer; |
| struct mlxbf_tmfifo_vring *vring[2]; |
| spinlock_t spin_lock[2]; /* spin lock */ |
| bool is_ready; |
| }; |
| |
| /** |
| * mlxbf_tmfifo_msg_hdr - Structure of the TmFifo message header |
| * @type: message type |
| * @len: payload length in network byte order. Messages sent into the FIFO |
| * will be read by the other side as data stream in the same byte order. |
| * The length needs to be encoded into network order so both sides |
| * could understand it. |
| */ |
| struct mlxbf_tmfifo_msg_hdr { |
| u8 type; |
| __be16 len; |
| u8 unused[5]; |
| } __packed __aligned(sizeof(u64)); |
| |
| /* |
| * Default MAC. |
| * This MAC address will be read from EFI persistent variable if configured. |
| * It can also be reconfigured with standard Linux tools. |
| */ |
| static u8 mlxbf_tmfifo_net_default_mac[ETH_ALEN] = { |
| 0x00, 0x1A, 0xCA, 0xFF, 0xFF, 0x01 |
| }; |
| |
| /* EFI variable name of the MAC address. */ |
| static efi_char16_t mlxbf_tmfifo_efi_name[] = L"RshimMacAddr"; |
| |
| /* Maximum L2 header length. */ |
| #define MLXBF_TMFIFO_NET_L2_OVERHEAD (ETH_HLEN + VLAN_HLEN) |
| |
| /* Supported virtio-net features. */ |
| #define MLXBF_TMFIFO_NET_FEATURES \ |
| (BIT_ULL(VIRTIO_NET_F_MTU) | BIT_ULL(VIRTIO_NET_F_STATUS) | \ |
| BIT_ULL(VIRTIO_NET_F_MAC)) |
| |
| #define mlxbf_vdev_to_tmfifo(d) container_of(d, struct mlxbf_tmfifo_vdev, vdev) |
| |
| /* Free vrings of the FIFO device. */ |
| static void mlxbf_tmfifo_free_vrings(struct mlxbf_tmfifo *fifo, |
| struct mlxbf_tmfifo_vdev *tm_vdev) |
| { |
| struct mlxbf_tmfifo_vring *vring; |
| int i, size; |
| |
| for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) { |
| vring = &tm_vdev->vrings[i]; |
| if (vring->va) { |
| size = vring_size(vring->num, vring->align); |
| dma_free_coherent(tm_vdev->vdev.dev.parent, size, |
| vring->va, vring->dma); |
| vring->va = NULL; |
| if (vring->vq) { |
| vring_del_virtqueue(vring->vq); |
| vring->vq = NULL; |
| } |
| } |
| } |
| } |
| |
| /* Allocate vrings for the FIFO. */ |
| static int mlxbf_tmfifo_alloc_vrings(struct mlxbf_tmfifo *fifo, |
| struct mlxbf_tmfifo_vdev *tm_vdev) |
| { |
| struct mlxbf_tmfifo_vring *vring; |
| struct device *dev; |
| dma_addr_t dma; |
| int i, size; |
| void *va; |
| |
| for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) { |
| vring = &tm_vdev->vrings[i]; |
| vring->fifo = fifo; |
| vring->num = MLXBF_TMFIFO_VRING_SIZE; |
| vring->align = SMP_CACHE_BYTES; |
| vring->index = i; |
| vring->vdev_id = tm_vdev->vdev.id.device; |
| vring->drop_desc.len = VRING_DROP_DESC_MAX_LEN; |
| dev = &tm_vdev->vdev.dev; |
| |
| size = vring_size(vring->num, vring->align); |
| va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL); |
| if (!va) { |
| mlxbf_tmfifo_free_vrings(fifo, tm_vdev); |
| dev_err(dev->parent, "dma_alloc_coherent failed\n"); |
| return -ENOMEM; |
| } |
| |
| vring->va = va; |
| vring->dma = dma; |
| } |
| |
| return 0; |
| } |
| |
| /* Disable interrupts of the FIFO device. */ |
| static void mlxbf_tmfifo_disable_irqs(struct mlxbf_tmfifo *fifo) |
| { |
| int i, irq; |
| |
| for (i = 0; i < MLXBF_TM_MAX_IRQ; i++) { |
| irq = fifo->irq_info[i].irq; |
| fifo->irq_info[i].irq = 0; |
| disable_irq(irq); |
| } |
| } |
| |
| /* Interrupt handler. */ |
| static irqreturn_t mlxbf_tmfifo_irq_handler(int irq, void *arg) |
| { |
| struct mlxbf_tmfifo_irq_info *irq_info = arg; |
| |
| if (!test_and_set_bit(irq_info->index, &irq_info->fifo->pend_events)) |
| schedule_work(&irq_info->fifo->work); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /* Get the next packet descriptor from the vring. */ |
| static struct vring_desc * |
| mlxbf_tmfifo_get_next_desc(struct mlxbf_tmfifo_vring *vring) |
| { |
| const struct vring *vr = virtqueue_get_vring(vring->vq); |
| struct virtio_device *vdev = vring->vq->vdev; |
| unsigned int idx, head; |
| |
| if (vring->next_avail == virtio16_to_cpu(vdev, vr->avail->idx)) |
| return NULL; |
| |
| /* Make sure 'avail->idx' is visible already. */ |
| virtio_rmb(false); |
| |
| idx = vring->next_avail % vr->num; |
| head = virtio16_to_cpu(vdev, vr->avail->ring[idx]); |
| if (WARN_ON(head >= vr->num)) |
| return NULL; |
| |
| vring->next_avail++; |
| |
| return &vr->desc[head]; |
| } |
| |
| /* Release virtio descriptor. */ |
| static void mlxbf_tmfifo_release_desc(struct mlxbf_tmfifo_vring *vring, |
| struct vring_desc *desc, u32 len) |
| { |
| const struct vring *vr = virtqueue_get_vring(vring->vq); |
| struct virtio_device *vdev = vring->vq->vdev; |
| u16 idx, vr_idx; |
| |
| vr_idx = virtio16_to_cpu(vdev, vr->used->idx); |
| idx = vr_idx % vr->num; |
| vr->used->ring[idx].id = cpu_to_virtio32(vdev, desc - vr->desc); |
| vr->used->ring[idx].len = cpu_to_virtio32(vdev, len); |
| |
| /* |
| * Virtio could poll and check the 'idx' to decide whether the desc is |
| * done or not. Add a memory barrier here to make sure the update above |
| * completes before updating the idx. |
| */ |
| virtio_mb(false); |
| vr->used->idx = cpu_to_virtio16(vdev, vr_idx + 1); |
| } |
| |
| /* Get the total length of the descriptor chain. */ |
| static u32 mlxbf_tmfifo_get_pkt_len(struct mlxbf_tmfifo_vring *vring, |
| struct vring_desc *desc) |
| { |
| const struct vring *vr = virtqueue_get_vring(vring->vq); |
| struct virtio_device *vdev = vring->vq->vdev; |
| u32 len = 0, idx; |
| |
| while (desc) { |
| len += virtio32_to_cpu(vdev, desc->len); |
| if (!(virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT)) |
| break; |
| idx = virtio16_to_cpu(vdev, desc->next); |
| desc = &vr->desc[idx]; |
| } |
| |
| return len; |
| } |
| |
| static void mlxbf_tmfifo_release_pkt(struct mlxbf_tmfifo_vring *vring) |
| { |
| struct vring_desc *desc_head; |
| u32 len = 0; |
| |
| if (vring->desc_head) { |
| desc_head = vring->desc_head; |
| len = vring->pkt_len; |
| } else { |
| desc_head = mlxbf_tmfifo_get_next_desc(vring); |
| len = mlxbf_tmfifo_get_pkt_len(vring, desc_head); |
| } |
| |
| if (desc_head) |
| mlxbf_tmfifo_release_desc(vring, desc_head, len); |
| |
| vring->pkt_len = 0; |
| vring->desc = NULL; |
| vring->desc_head = NULL; |
| } |
| |
| static void mlxbf_tmfifo_init_net_desc(struct mlxbf_tmfifo_vring *vring, |
| struct vring_desc *desc, bool is_rx) |
| { |
| struct virtio_device *vdev = vring->vq->vdev; |
| struct virtio_net_hdr *net_hdr; |
| |
| net_hdr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr)); |
| memset(net_hdr, 0, sizeof(*net_hdr)); |
| } |
| |
| /* Get and initialize the next packet. */ |
| static struct vring_desc * |
| mlxbf_tmfifo_get_next_pkt(struct mlxbf_tmfifo_vring *vring, bool is_rx) |
| { |
| struct vring_desc *desc; |
| |
| desc = mlxbf_tmfifo_get_next_desc(vring); |
| if (desc && is_rx && vring->vdev_id == VIRTIO_ID_NET) |
| mlxbf_tmfifo_init_net_desc(vring, desc, is_rx); |
| |
| vring->desc_head = desc; |
| vring->desc = desc; |
| |
| return desc; |
| } |
| |
| /* House-keeping timer. */ |
| static void mlxbf_tmfifo_timer(struct timer_list *t) |
| { |
| struct mlxbf_tmfifo *fifo = container_of(t, struct mlxbf_tmfifo, timer); |
| int rx, tx; |
| |
| rx = !test_and_set_bit(MLXBF_TM_RX_HWM_IRQ, &fifo->pend_events); |
| tx = !test_and_set_bit(MLXBF_TM_TX_LWM_IRQ, &fifo->pend_events); |
| |
| if (rx || tx) |
| schedule_work(&fifo->work); |
| |
| mod_timer(&fifo->timer, jiffies + MLXBF_TMFIFO_TIMER_INTERVAL); |
| } |
| |
| /* Copy one console packet into the output buffer. */ |
| static void mlxbf_tmfifo_console_output_one(struct mlxbf_tmfifo_vdev *cons, |
| struct mlxbf_tmfifo_vring *vring, |
| struct vring_desc *desc) |
| { |
| const struct vring *vr = virtqueue_get_vring(vring->vq); |
| struct virtio_device *vdev = &cons->vdev; |
| u32 len, idx, seg; |
| void *addr; |
| |
| while (desc) { |
| addr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr)); |
| len = virtio32_to_cpu(vdev, desc->len); |
| |
| seg = CIRC_SPACE_TO_END(cons->tx_buf.head, cons->tx_buf.tail, |
| MLXBF_TMFIFO_CON_TX_BUF_SIZE); |
| if (len <= seg) { |
| memcpy(cons->tx_buf.buf + cons->tx_buf.head, addr, len); |
| } else { |
| memcpy(cons->tx_buf.buf + cons->tx_buf.head, addr, seg); |
| addr += seg; |
| memcpy(cons->tx_buf.buf, addr, len - seg); |
| } |
| cons->tx_buf.head = (cons->tx_buf.head + len) % |
| MLXBF_TMFIFO_CON_TX_BUF_SIZE; |
| |
| if (!(virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT)) |
| break; |
| idx = virtio16_to_cpu(vdev, desc->next); |
| desc = &vr->desc[idx]; |
| } |
| } |
| |
| /* Copy console data into the output buffer. */ |
| static void mlxbf_tmfifo_console_output(struct mlxbf_tmfifo_vdev *cons, |
| struct mlxbf_tmfifo_vring *vring) |
| { |
| struct vring_desc *desc; |
| u32 len, avail; |
| |
| desc = mlxbf_tmfifo_get_next_desc(vring); |
| while (desc) { |
| /* Release the packet if not enough space. */ |
| len = mlxbf_tmfifo_get_pkt_len(vring, desc); |
| avail = CIRC_SPACE(cons->tx_buf.head, cons->tx_buf.tail, |
| MLXBF_TMFIFO_CON_TX_BUF_SIZE); |
| if (len + MLXBF_TMFIFO_CON_TX_BUF_RSV_SIZE > avail) { |
| mlxbf_tmfifo_release_desc(vring, desc, len); |
| break; |
| } |
| |
| mlxbf_tmfifo_console_output_one(cons, vring, desc); |
| mlxbf_tmfifo_release_desc(vring, desc, len); |
| desc = mlxbf_tmfifo_get_next_desc(vring); |
| } |
| } |
| |
| /* Get the number of available words in Rx FIFO for receiving. */ |
| static int mlxbf_tmfifo_get_rx_avail(struct mlxbf_tmfifo *fifo) |
| { |
| u64 sts; |
| |
| sts = readq(fifo->rx_base + MLXBF_TMFIFO_RX_STS); |
| return FIELD_GET(MLXBF_TMFIFO_RX_STS__COUNT_MASK, sts); |
| } |
| |
| /* Get the number of available words in the TmFifo for sending. */ |
| static int mlxbf_tmfifo_get_tx_avail(struct mlxbf_tmfifo *fifo, int vdev_id) |
| { |
| int tx_reserve; |
| u32 count; |
| u64 sts; |
| |
| /* Reserve some room in FIFO for console messages. */ |
| if (vdev_id == VIRTIO_ID_NET) |
| tx_reserve = fifo->tx_fifo_size / MLXBF_TMFIFO_RESERVE_RATIO; |
| else |
| tx_reserve = 1; |
| |
| sts = readq(fifo->tx_base + MLXBF_TMFIFO_TX_STS); |
| count = FIELD_GET(MLXBF_TMFIFO_TX_STS__COUNT_MASK, sts); |
| return fifo->tx_fifo_size - tx_reserve - count; |
| } |
| |
| /* Console Tx (move data from the output buffer into the TmFifo). */ |
| static void mlxbf_tmfifo_console_tx(struct mlxbf_tmfifo *fifo, int avail) |
| { |
| struct mlxbf_tmfifo_msg_hdr hdr; |
| struct mlxbf_tmfifo_vdev *cons; |
| unsigned long flags; |
| int size, seg; |
| void *addr; |
| u64 data; |
| |
| /* Return if not enough space available. */ |
| if (avail < MLXBF_TMFIFO_DATA_MIN_WORDS) |
| return; |
| |
| cons = fifo->vdev[VIRTIO_ID_CONSOLE]; |
| if (!cons || !cons->tx_buf.buf) |
| return; |
| |
| /* Return if no data to send. */ |
| size = CIRC_CNT(cons->tx_buf.head, cons->tx_buf.tail, |
| MLXBF_TMFIFO_CON_TX_BUF_SIZE); |
| if (size == 0) |
| return; |
| |
| /* Adjust the size to available space. */ |
| if (size + sizeof(hdr) > avail * sizeof(u64)) |
| size = avail * sizeof(u64) - sizeof(hdr); |
| |
| /* Write header. */ |
| hdr.type = VIRTIO_ID_CONSOLE; |
| hdr.len = htons(size); |
| writeq(*(u64 *)&hdr, fifo->tx_base + MLXBF_TMFIFO_TX_DATA); |
| |
| /* Use spin-lock to protect the 'cons->tx_buf'. */ |
| spin_lock_irqsave(&fifo->spin_lock[0], flags); |
| |
| while (size > 0) { |
| addr = cons->tx_buf.buf + cons->tx_buf.tail; |
| |
| seg = CIRC_CNT_TO_END(cons->tx_buf.head, cons->tx_buf.tail, |
| MLXBF_TMFIFO_CON_TX_BUF_SIZE); |
| if (seg >= sizeof(u64)) { |
| memcpy(&data, addr, sizeof(u64)); |
| } else { |
| memcpy(&data, addr, seg); |
| memcpy((u8 *)&data + seg, cons->tx_buf.buf, |
| sizeof(u64) - seg); |
| } |
| writeq(data, fifo->tx_base + MLXBF_TMFIFO_TX_DATA); |
| |
| if (size >= sizeof(u64)) { |
| cons->tx_buf.tail = (cons->tx_buf.tail + sizeof(u64)) % |
| MLXBF_TMFIFO_CON_TX_BUF_SIZE; |
| size -= sizeof(u64); |
| } else { |
| cons->tx_buf.tail = (cons->tx_buf.tail + size) % |
| MLXBF_TMFIFO_CON_TX_BUF_SIZE; |
| size = 0; |
| } |
| } |
| |
| spin_unlock_irqrestore(&fifo->spin_lock[0], flags); |
| } |
| |
| /* Rx/Tx one word in the descriptor buffer. */ |
| static void mlxbf_tmfifo_rxtx_word(struct mlxbf_tmfifo_vring *vring, |
| struct vring_desc *desc, |
| bool is_rx, int len) |
| { |
| struct virtio_device *vdev = vring->vq->vdev; |
| struct mlxbf_tmfifo *fifo = vring->fifo; |
| void *addr; |
| u64 data; |
| |
| /* Get the buffer address of this desc. */ |
| addr = phys_to_virt(virtio64_to_cpu(vdev, desc->addr)); |
| |
| /* Read a word from FIFO for Rx. */ |
| if (is_rx) |
| data = readq(fifo->rx_base + MLXBF_TMFIFO_RX_DATA); |
| |
| if (vring->cur_len + sizeof(u64) <= len) { |
| /* The whole word. */ |
| if (is_rx) { |
| if (!IS_VRING_DROP(vring)) |
| memcpy(addr + vring->cur_len, &data, |
| sizeof(u64)); |
| } else { |
| memcpy(&data, addr + vring->cur_len, |
| sizeof(u64)); |
| } |
| vring->cur_len += sizeof(u64); |
| } else { |
| /* Leftover bytes. */ |
| if (is_rx) { |
| if (!IS_VRING_DROP(vring)) |
| memcpy(addr + vring->cur_len, &data, |
| len - vring->cur_len); |
| } else { |
| data = 0; |
| memcpy(&data, addr + vring->cur_len, |
| len - vring->cur_len); |
| } |
| vring->cur_len = len; |
| } |
| |
| /* Write the word into FIFO for Tx. */ |
| if (!is_rx) |
| writeq(data, fifo->tx_base + MLXBF_TMFIFO_TX_DATA); |
| } |
| |
| /* |
| * Rx/Tx packet header. |
| * |
| * In Rx case, the packet might be found to belong to a different vring since |
| * the TmFifo is shared by different services. In such case, the 'vring_change' |
| * flag is set. |
| */ |
| static void mlxbf_tmfifo_rxtx_header(struct mlxbf_tmfifo_vring *vring, |
| struct vring_desc **desc, |
| bool is_rx, bool *vring_change) |
| { |
| struct mlxbf_tmfifo *fifo = vring->fifo; |
| struct virtio_net_config *config; |
| struct mlxbf_tmfifo_msg_hdr hdr; |
| int vdev_id, hdr_len; |
| bool drop_rx = false; |
| |
| /* Read/Write packet header. */ |
| if (is_rx) { |
| /* Drain one word from the FIFO. */ |
| *(u64 *)&hdr = readq(fifo->rx_base + MLXBF_TMFIFO_RX_DATA); |
| |
| /* Skip the length 0 packets (keepalive). */ |
| if (hdr.len == 0) |
| return; |
| |
| /* Check packet type. */ |
| if (hdr.type == VIRTIO_ID_NET) { |
| vdev_id = VIRTIO_ID_NET; |
| hdr_len = sizeof(struct virtio_net_hdr); |
| config = &fifo->vdev[vdev_id]->config.net; |
| /* A legacy-only interface for now. */ |
| if (ntohs(hdr.len) > |
| __virtio16_to_cpu(virtio_legacy_is_little_endian(), |
| config->mtu) + |
| MLXBF_TMFIFO_NET_L2_OVERHEAD) |
| drop_rx = true; |
| } else { |
| vdev_id = VIRTIO_ID_CONSOLE; |
| hdr_len = 0; |
| } |
| |
| /* |
| * Check whether the new packet still belongs to this vring. |
| * If not, update the pkt_len of the new vring. |
| */ |
| if (vdev_id != vring->vdev_id) { |
| struct mlxbf_tmfifo_vdev *tm_dev2 = fifo->vdev[vdev_id]; |
| |
| if (!tm_dev2) |
| return; |
| vring->desc = *desc; |
| vring = &tm_dev2->vrings[MLXBF_TMFIFO_VRING_RX]; |
| *vring_change = true; |
| } |
| |
| if (drop_rx && !IS_VRING_DROP(vring)) { |
| if (vring->desc_head) |
| mlxbf_tmfifo_release_pkt(vring); |
| *desc = &vring->drop_desc; |
| vring->desc_head = *desc; |
| vring->desc = *desc; |
| } |
| |
| vring->pkt_len = ntohs(hdr.len) + hdr_len; |
| } else { |
| /* Network virtio has an extra header. */ |
| hdr_len = (vring->vdev_id == VIRTIO_ID_NET) ? |
| sizeof(struct virtio_net_hdr) : 0; |
| vring->pkt_len = mlxbf_tmfifo_get_pkt_len(vring, *desc); |
| hdr.type = (vring->vdev_id == VIRTIO_ID_NET) ? |
| VIRTIO_ID_NET : VIRTIO_ID_CONSOLE; |
| hdr.len = htons(vring->pkt_len - hdr_len); |
| writeq(*(u64 *)&hdr, fifo->tx_base + MLXBF_TMFIFO_TX_DATA); |
| } |
| |
| vring->cur_len = hdr_len; |
| vring->rem_len = vring->pkt_len; |
| fifo->vring[is_rx] = vring; |
| } |
| |
| /* |
| * Rx/Tx one descriptor. |
| * |
| * Return true to indicate more data available. |
| */ |
| static bool mlxbf_tmfifo_rxtx_one_desc(struct mlxbf_tmfifo_vring *vring, |
| bool is_rx, int *avail) |
| { |
| const struct vring *vr = virtqueue_get_vring(vring->vq); |
| struct mlxbf_tmfifo *fifo = vring->fifo; |
| struct virtio_device *vdev; |
| bool vring_change = false; |
| struct vring_desc *desc; |
| unsigned long flags; |
| u32 len, idx; |
| |
| vdev = &fifo->vdev[vring->vdev_id]->vdev; |
| |
| /* Get the descriptor of the next packet. */ |
| if (!vring->desc) { |
| desc = mlxbf_tmfifo_get_next_pkt(vring, is_rx); |
| if (!desc) { |
| /* Drop next Rx packet to avoid stuck. */ |
| if (is_rx) { |
| desc = &vring->drop_desc; |
| vring->desc_head = desc; |
| vring->desc = desc; |
| } else { |
| return false; |
| } |
| } |
| } else { |
| desc = vring->desc; |
| } |
| |
| /* Beginning of a packet. Start to Rx/Tx packet header. */ |
| if (vring->pkt_len == 0) { |
| mlxbf_tmfifo_rxtx_header(vring, &desc, is_rx, &vring_change); |
| (*avail)--; |
| |
| /* Return if new packet is for another ring. */ |
| if (vring_change) |
| return false; |
| goto mlxbf_tmfifo_desc_done; |
| } |
| |
| /* Get the length of this desc. */ |
| len = virtio32_to_cpu(vdev, desc->len); |
| if (len > vring->rem_len) |
| len = vring->rem_len; |
| |
| /* Rx/Tx one word (8 bytes) if not done. */ |
| if (vring->cur_len < len) { |
| mlxbf_tmfifo_rxtx_word(vring, desc, is_rx, len); |
| (*avail)--; |
| } |
| |
| /* Check again whether it's done. */ |
| if (vring->cur_len == len) { |
| vring->cur_len = 0; |
| vring->rem_len -= len; |
| |
| /* Get the next desc on the chain. */ |
| if (!IS_VRING_DROP(vring) && vring->rem_len > 0 && |
| (virtio16_to_cpu(vdev, desc->flags) & VRING_DESC_F_NEXT)) { |
| idx = virtio16_to_cpu(vdev, desc->next); |
| desc = &vr->desc[idx]; |
| goto mlxbf_tmfifo_desc_done; |
| } |
| |
| /* Done and release the packet. */ |
| desc = NULL; |
| fifo->vring[is_rx] = NULL; |
| if (!IS_VRING_DROP(vring)) { |
| mlxbf_tmfifo_release_pkt(vring); |
| } else { |
| vring->pkt_len = 0; |
| vring->desc_head = NULL; |
| vring->desc = NULL; |
| return false; |
| } |
| |
| /* |
| * Make sure the load/store are in order before |
| * returning back to virtio. |
| */ |
| virtio_mb(false); |
| |
| /* Notify upper layer that packet is done. */ |
| spin_lock_irqsave(&fifo->spin_lock[is_rx], flags); |
| vring_interrupt(0, vring->vq); |
| spin_unlock_irqrestore(&fifo->spin_lock[is_rx], flags); |
| } |
| |
| mlxbf_tmfifo_desc_done: |
| /* Save the current desc. */ |
| vring->desc = desc; |
| |
| return true; |
| } |
| |
| /* Rx & Tx processing of a queue. */ |
| static void mlxbf_tmfifo_rxtx(struct mlxbf_tmfifo_vring *vring, bool is_rx) |
| { |
| int avail = 0, devid = vring->vdev_id; |
| struct mlxbf_tmfifo *fifo; |
| bool more; |
| |
| fifo = vring->fifo; |
| |
| /* Return if vdev is not ready. */ |
| if (!fifo->vdev[devid]) |
| return; |
| |
| /* Return if another vring is running. */ |
| if (fifo->vring[is_rx] && fifo->vring[is_rx] != vring) |
| return; |
| |
| /* Only handle console and network for now. */ |
| if (WARN_ON(devid != VIRTIO_ID_NET && devid != VIRTIO_ID_CONSOLE)) |
| return; |
| |
| do { |
| /* Get available FIFO space. */ |
| if (avail == 0) { |
| if (is_rx) |
| avail = mlxbf_tmfifo_get_rx_avail(fifo); |
| else |
| avail = mlxbf_tmfifo_get_tx_avail(fifo, devid); |
| if (avail <= 0) |
| break; |
| } |
| |
| /* Console output always comes from the Tx buffer. */ |
| if (!is_rx && devid == VIRTIO_ID_CONSOLE) { |
| mlxbf_tmfifo_console_tx(fifo, avail); |
| break; |
| } |
| |
| /* Handle one descriptor. */ |
| more = mlxbf_tmfifo_rxtx_one_desc(vring, is_rx, &avail); |
| } while (more); |
| } |
| |
| /* Handle Rx or Tx queues. */ |
| static void mlxbf_tmfifo_work_rxtx(struct mlxbf_tmfifo *fifo, int queue_id, |
| int irq_id, bool is_rx) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev; |
| struct mlxbf_tmfifo_vring *vring; |
| int i; |
| |
| if (!test_and_clear_bit(irq_id, &fifo->pend_events) || |
| !fifo->irq_info[irq_id].irq) |
| return; |
| |
| for (i = 0; i < MLXBF_TMFIFO_VDEV_MAX; i++) { |
| tm_vdev = fifo->vdev[i]; |
| if (tm_vdev) { |
| vring = &tm_vdev->vrings[queue_id]; |
| if (vring->vq) |
| mlxbf_tmfifo_rxtx(vring, is_rx); |
| } |
| } |
| } |
| |
| /* Work handler for Rx and Tx case. */ |
| static void mlxbf_tmfifo_work_handler(struct work_struct *work) |
| { |
| struct mlxbf_tmfifo *fifo; |
| |
| fifo = container_of(work, struct mlxbf_tmfifo, work); |
| if (!fifo->is_ready) |
| return; |
| |
| mutex_lock(&fifo->lock); |
| |
| /* Tx (Send data to the TmFifo). */ |
| mlxbf_tmfifo_work_rxtx(fifo, MLXBF_TMFIFO_VRING_TX, |
| MLXBF_TM_TX_LWM_IRQ, false); |
| |
| /* Rx (Receive data from the TmFifo). */ |
| mlxbf_tmfifo_work_rxtx(fifo, MLXBF_TMFIFO_VRING_RX, |
| MLXBF_TM_RX_HWM_IRQ, true); |
| |
| mutex_unlock(&fifo->lock); |
| } |
| |
| /* The notify function is called when new buffers are posted. */ |
| static bool mlxbf_tmfifo_virtio_notify(struct virtqueue *vq) |
| { |
| struct mlxbf_tmfifo_vring *vring = vq->priv; |
| struct mlxbf_tmfifo_vdev *tm_vdev; |
| struct mlxbf_tmfifo *fifo; |
| unsigned long flags; |
| |
| fifo = vring->fifo; |
| |
| /* |
| * Virtio maintains vrings in pairs, even number ring for Rx |
| * and odd number ring for Tx. |
| */ |
| if (vring->index & BIT(0)) { |
| /* |
| * Console could make blocking call with interrupts disabled. |
| * In such case, the vring needs to be served right away. For |
| * other cases, just set the TX LWM bit to start Tx in the |
| * worker handler. |
| */ |
| if (vring->vdev_id == VIRTIO_ID_CONSOLE) { |
| spin_lock_irqsave(&fifo->spin_lock[0], flags); |
| tm_vdev = fifo->vdev[VIRTIO_ID_CONSOLE]; |
| mlxbf_tmfifo_console_output(tm_vdev, vring); |
| spin_unlock_irqrestore(&fifo->spin_lock[0], flags); |
| set_bit(MLXBF_TM_TX_LWM_IRQ, &fifo->pend_events); |
| } else if (test_and_set_bit(MLXBF_TM_TX_LWM_IRQ, |
| &fifo->pend_events)) { |
| return true; |
| } |
| } else { |
| if (test_and_set_bit(MLXBF_TM_RX_HWM_IRQ, &fifo->pend_events)) |
| return true; |
| } |
| |
| schedule_work(&fifo->work); |
| |
| return true; |
| } |
| |
| /* Get the array of feature bits for this device. */ |
| static u64 mlxbf_tmfifo_virtio_get_features(struct virtio_device *vdev) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| |
| return tm_vdev->features; |
| } |
| |
| /* Confirm device features to use. */ |
| static int mlxbf_tmfifo_virtio_finalize_features(struct virtio_device *vdev) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| |
| tm_vdev->features = vdev->features; |
| |
| return 0; |
| } |
| |
| /* Free virtqueues found by find_vqs(). */ |
| static void mlxbf_tmfifo_virtio_del_vqs(struct virtio_device *vdev) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| struct mlxbf_tmfifo_vring *vring; |
| struct virtqueue *vq; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(tm_vdev->vrings); i++) { |
| vring = &tm_vdev->vrings[i]; |
| |
| /* Release the pending packet. */ |
| if (vring->desc) |
| mlxbf_tmfifo_release_pkt(vring); |
| vq = vring->vq; |
| if (vq) { |
| vring->vq = NULL; |
| vring_del_virtqueue(vq); |
| } |
| } |
| } |
| |
| /* Create and initialize the virtual queues. */ |
| static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev, |
| unsigned int nvqs, |
| struct virtqueue *vqs[], |
| vq_callback_t *callbacks[], |
| const char * const names[], |
| const bool *ctx, |
| struct irq_affinity *desc) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| struct mlxbf_tmfifo_vring *vring; |
| struct virtqueue *vq; |
| int i, ret, size; |
| |
| if (nvqs > ARRAY_SIZE(tm_vdev->vrings)) |
| return -EINVAL; |
| |
| for (i = 0; i < nvqs; ++i) { |
| if (!names[i]) { |
| ret = -EINVAL; |
| goto error; |
| } |
| vring = &tm_vdev->vrings[i]; |
| |
| /* zero vring */ |
| size = vring_size(vring->num, vring->align); |
| memset(vring->va, 0, size); |
| vq = vring_new_virtqueue(i, vring->num, vring->align, vdev, |
| false, false, vring->va, |
| mlxbf_tmfifo_virtio_notify, |
| callbacks[i], names[i]); |
| if (!vq) { |
| dev_err(&vdev->dev, "vring_new_virtqueue failed\n"); |
| ret = -ENOMEM; |
| goto error; |
| } |
| |
| vqs[i] = vq; |
| vring->vq = vq; |
| vq->priv = vring; |
| } |
| |
| return 0; |
| |
| error: |
| mlxbf_tmfifo_virtio_del_vqs(vdev); |
| return ret; |
| } |
| |
| /* Read the status byte. */ |
| static u8 mlxbf_tmfifo_virtio_get_status(struct virtio_device *vdev) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| |
| return tm_vdev->status; |
| } |
| |
| /* Write the status byte. */ |
| static void mlxbf_tmfifo_virtio_set_status(struct virtio_device *vdev, |
| u8 status) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| |
| tm_vdev->status = status; |
| } |
| |
| /* Reset the device. Not much here for now. */ |
| static void mlxbf_tmfifo_virtio_reset(struct virtio_device *vdev) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| |
| tm_vdev->status = 0; |
| } |
| |
| /* Read the value of a configuration field. */ |
| static void mlxbf_tmfifo_virtio_get(struct virtio_device *vdev, |
| unsigned int offset, |
| void *buf, |
| unsigned int len) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| |
| if ((u64)offset + len > sizeof(tm_vdev->config)) |
| return; |
| |
| memcpy(buf, (u8 *)&tm_vdev->config + offset, len); |
| } |
| |
| /* Write the value of a configuration field. */ |
| static void mlxbf_tmfifo_virtio_set(struct virtio_device *vdev, |
| unsigned int offset, |
| const void *buf, |
| unsigned int len) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| |
| if ((u64)offset + len > sizeof(tm_vdev->config)) |
| return; |
| |
| memcpy((u8 *)&tm_vdev->config + offset, buf, len); |
| } |
| |
| static void tmfifo_virtio_dev_release(struct device *device) |
| { |
| struct virtio_device *vdev = |
| container_of(device, struct virtio_device, dev); |
| struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev); |
| |
| kfree(tm_vdev); |
| } |
| |
| /* Virtio config operations. */ |
| static const struct virtio_config_ops mlxbf_tmfifo_virtio_config_ops = { |
| .get_features = mlxbf_tmfifo_virtio_get_features, |
| .finalize_features = mlxbf_tmfifo_virtio_finalize_features, |
| .find_vqs = mlxbf_tmfifo_virtio_find_vqs, |
| .del_vqs = mlxbf_tmfifo_virtio_del_vqs, |
| .reset = mlxbf_tmfifo_virtio_reset, |
| .set_status = mlxbf_tmfifo_virtio_set_status, |
| .get_status = mlxbf_tmfifo_virtio_get_status, |
| .get = mlxbf_tmfifo_virtio_get, |
| .set = mlxbf_tmfifo_virtio_set, |
| }; |
| |
| /* Create vdev for the FIFO. */ |
| static int mlxbf_tmfifo_create_vdev(struct device *dev, |
| struct mlxbf_tmfifo *fifo, |
| int vdev_id, u64 features, |
| void *config, u32 size) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev, *reg_dev = NULL; |
| int ret; |
| |
| mutex_lock(&fifo->lock); |
| |
| tm_vdev = fifo->vdev[vdev_id]; |
| if (tm_vdev) { |
| dev_err(dev, "vdev %d already exists\n", vdev_id); |
| ret = -EEXIST; |
| goto fail; |
| } |
| |
| tm_vdev = kzalloc(sizeof(*tm_vdev), GFP_KERNEL); |
| if (!tm_vdev) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| |
| tm_vdev->vdev.id.device = vdev_id; |
| tm_vdev->vdev.config = &mlxbf_tmfifo_virtio_config_ops; |
| tm_vdev->vdev.dev.parent = dev; |
| tm_vdev->vdev.dev.release = tmfifo_virtio_dev_release; |
| tm_vdev->features = features; |
| if (config) |
| memcpy(&tm_vdev->config, config, size); |
| |
| if (mlxbf_tmfifo_alloc_vrings(fifo, tm_vdev)) { |
| dev_err(dev, "unable to allocate vring\n"); |
| ret = -ENOMEM; |
| goto vdev_fail; |
| } |
| |
| /* Allocate an output buffer for the console device. */ |
| if (vdev_id == VIRTIO_ID_CONSOLE) |
| tm_vdev->tx_buf.buf = devm_kmalloc(dev, |
| MLXBF_TMFIFO_CON_TX_BUF_SIZE, |
| GFP_KERNEL); |
| fifo->vdev[vdev_id] = tm_vdev; |
| |
| /* Register the virtio device. */ |
| ret = register_virtio_device(&tm_vdev->vdev); |
| reg_dev = tm_vdev; |
| if (ret) { |
| dev_err(dev, "register_virtio_device failed\n"); |
| goto vdev_fail; |
| } |
| |
| mutex_unlock(&fifo->lock); |
| return 0; |
| |
| vdev_fail: |
| mlxbf_tmfifo_free_vrings(fifo, tm_vdev); |
| fifo->vdev[vdev_id] = NULL; |
| if (reg_dev) |
| put_device(&tm_vdev->vdev.dev); |
| else |
| kfree(tm_vdev); |
| fail: |
| mutex_unlock(&fifo->lock); |
| return ret; |
| } |
| |
| /* Delete vdev for the FIFO. */ |
| static int mlxbf_tmfifo_delete_vdev(struct mlxbf_tmfifo *fifo, int vdev_id) |
| { |
| struct mlxbf_tmfifo_vdev *tm_vdev; |
| |
| mutex_lock(&fifo->lock); |
| |
| /* Unregister vdev. */ |
| tm_vdev = fifo->vdev[vdev_id]; |
| if (tm_vdev) { |
| unregister_virtio_device(&tm_vdev->vdev); |
| mlxbf_tmfifo_free_vrings(fifo, tm_vdev); |
| fifo->vdev[vdev_id] = NULL; |
| } |
| |
| mutex_unlock(&fifo->lock); |
| |
| return 0; |
| } |
| |
| /* Read the configured network MAC address from efi variable. */ |
| static void mlxbf_tmfifo_get_cfg_mac(u8 *mac) |
| { |
| efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID; |
| unsigned long size = ETH_ALEN; |
| u8 buf[ETH_ALEN]; |
| efi_status_t rc; |
| |
| rc = efi.get_variable(mlxbf_tmfifo_efi_name, &guid, NULL, &size, buf); |
| if (rc == EFI_SUCCESS && size == ETH_ALEN) |
| ether_addr_copy(mac, buf); |
| else |
| ether_addr_copy(mac, mlxbf_tmfifo_net_default_mac); |
| } |
| |
| /* Set TmFifo thresolds which is used to trigger interrupts. */ |
| static void mlxbf_tmfifo_set_threshold(struct mlxbf_tmfifo *fifo) |
| { |
| u64 ctl; |
| |
| /* Get Tx FIFO size and set the low/high watermark. */ |
| ctl = readq(fifo->tx_base + MLXBF_TMFIFO_TX_CTL); |
| fifo->tx_fifo_size = |
| FIELD_GET(MLXBF_TMFIFO_TX_CTL__MAX_ENTRIES_MASK, ctl); |
| ctl = (ctl & ~MLXBF_TMFIFO_TX_CTL__LWM_MASK) | |
| FIELD_PREP(MLXBF_TMFIFO_TX_CTL__LWM_MASK, |
| fifo->tx_fifo_size / 2); |
| ctl = (ctl & ~MLXBF_TMFIFO_TX_CTL__HWM_MASK) | |
| FIELD_PREP(MLXBF_TMFIFO_TX_CTL__HWM_MASK, |
| fifo->tx_fifo_size - 1); |
| writeq(ctl, fifo->tx_base + MLXBF_TMFIFO_TX_CTL); |
| |
| /* Get Rx FIFO size and set the low/high watermark. */ |
| ctl = readq(fifo->rx_base + MLXBF_TMFIFO_RX_CTL); |
| fifo->rx_fifo_size = |
| FIELD_GET(MLXBF_TMFIFO_RX_CTL__MAX_ENTRIES_MASK, ctl); |
| ctl = (ctl & ~MLXBF_TMFIFO_RX_CTL__LWM_MASK) | |
| FIELD_PREP(MLXBF_TMFIFO_RX_CTL__LWM_MASK, 0); |
| ctl = (ctl & ~MLXBF_TMFIFO_RX_CTL__HWM_MASK) | |
| FIELD_PREP(MLXBF_TMFIFO_RX_CTL__HWM_MASK, 1); |
| writeq(ctl, fifo->rx_base + MLXBF_TMFIFO_RX_CTL); |
| } |
| |
| static void mlxbf_tmfifo_cleanup(struct mlxbf_tmfifo *fifo) |
| { |
| int i; |
| |
| fifo->is_ready = false; |
| del_timer_sync(&fifo->timer); |
| mlxbf_tmfifo_disable_irqs(fifo); |
| cancel_work_sync(&fifo->work); |
| for (i = 0; i < MLXBF_TMFIFO_VDEV_MAX; i++) |
| mlxbf_tmfifo_delete_vdev(fifo, i); |
| } |
| |
| /* Probe the TMFIFO. */ |
| static int mlxbf_tmfifo_probe(struct platform_device *pdev) |
| { |
| struct virtio_net_config net_config; |
| struct device *dev = &pdev->dev; |
| struct mlxbf_tmfifo *fifo; |
| int i, rc; |
| |
| fifo = devm_kzalloc(dev, sizeof(*fifo), GFP_KERNEL); |
| if (!fifo) |
| return -ENOMEM; |
| |
| spin_lock_init(&fifo->spin_lock[0]); |
| spin_lock_init(&fifo->spin_lock[1]); |
| INIT_WORK(&fifo->work, mlxbf_tmfifo_work_handler); |
| mutex_init(&fifo->lock); |
| |
| /* Get the resource of the Rx FIFO. */ |
| fifo->rx_base = devm_platform_ioremap_resource(pdev, 0); |
| if (IS_ERR(fifo->rx_base)) |
| return PTR_ERR(fifo->rx_base); |
| |
| /* Get the resource of the Tx FIFO. */ |
| fifo->tx_base = devm_platform_ioremap_resource(pdev, 1); |
| if (IS_ERR(fifo->tx_base)) |
| return PTR_ERR(fifo->tx_base); |
| |
| platform_set_drvdata(pdev, fifo); |
| |
| timer_setup(&fifo->timer, mlxbf_tmfifo_timer, 0); |
| |
| for (i = 0; i < MLXBF_TM_MAX_IRQ; i++) { |
| fifo->irq_info[i].index = i; |
| fifo->irq_info[i].fifo = fifo; |
| fifo->irq_info[i].irq = platform_get_irq(pdev, i); |
| rc = devm_request_irq(dev, fifo->irq_info[i].irq, |
| mlxbf_tmfifo_irq_handler, 0, |
| "tmfifo", &fifo->irq_info[i]); |
| if (rc) { |
| dev_err(dev, "devm_request_irq failed\n"); |
| fifo->irq_info[i].irq = 0; |
| return rc; |
| } |
| } |
| |
| mlxbf_tmfifo_set_threshold(fifo); |
| |
| /* Create the console vdev. */ |
| rc = mlxbf_tmfifo_create_vdev(dev, fifo, VIRTIO_ID_CONSOLE, 0, NULL, 0); |
| if (rc) |
| goto fail; |
| |
| /* Create the network vdev. */ |
| memset(&net_config, 0, sizeof(net_config)); |
| |
| /* A legacy-only interface for now. */ |
| net_config.mtu = __cpu_to_virtio16(virtio_legacy_is_little_endian(), |
| ETH_DATA_LEN); |
| net_config.status = __cpu_to_virtio16(virtio_legacy_is_little_endian(), |
| VIRTIO_NET_S_LINK_UP); |
| mlxbf_tmfifo_get_cfg_mac(net_config.mac); |
| rc = mlxbf_tmfifo_create_vdev(dev, fifo, VIRTIO_ID_NET, |
| MLXBF_TMFIFO_NET_FEATURES, &net_config, |
| sizeof(net_config)); |
| if (rc) |
| goto fail; |
| |
| mod_timer(&fifo->timer, jiffies + MLXBF_TMFIFO_TIMER_INTERVAL); |
| |
| fifo->is_ready = true; |
| return 0; |
| |
| fail: |
| mlxbf_tmfifo_cleanup(fifo); |
| return rc; |
| } |
| |
| /* Device remove function. */ |
| static int mlxbf_tmfifo_remove(struct platform_device *pdev) |
| { |
| struct mlxbf_tmfifo *fifo = platform_get_drvdata(pdev); |
| |
| mlxbf_tmfifo_cleanup(fifo); |
| |
| return 0; |
| } |
| |
| static const struct acpi_device_id mlxbf_tmfifo_acpi_match[] = { |
| { "MLNXBF01", 0 }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(acpi, mlxbf_tmfifo_acpi_match); |
| |
| static struct platform_driver mlxbf_tmfifo_driver = { |
| .probe = mlxbf_tmfifo_probe, |
| .remove = mlxbf_tmfifo_remove, |
| .driver = { |
| .name = "bf-tmfifo", |
| .acpi_match_table = mlxbf_tmfifo_acpi_match, |
| }, |
| }; |
| |
| module_platform_driver(mlxbf_tmfifo_driver); |
| |
| MODULE_DESCRIPTION("Mellanox BlueField SoC TmFifo Driver"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Mellanox Technologies"); |