masayuki2009 commented on code in PR #7673: URL: https://github.com/apache/nuttx/pull/7673#discussion_r1033242533
########## drivers/virtio/virtio-mmio.c: ########## @@ -0,0 +1,226 @@ +/**************************************************************************** + * drivers/virtio/virtio-mmio.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> +#include <stdbool.h> +#include <debug.h> + +#include <nuttx/arch.h> +#include <nuttx/kmalloc.h> +#include <nuttx/virtio/virtio.h> + +#ifdef CONFIG_DRIVERS_VIRTIO_NET +# include <nuttx/virtio/virtio-net.h> +#endif + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +#define ptr_to_uint64(x) ((uint64_t)(uintptr_t)(x)) + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: virtq_create + ****************************************************************************/ + +FAR struct virtqueue *virtq_create(uint32_t len) +{ + FAR struct virtqueue *virtq = (FAR struct virtqueue *) + kmm_zalloc(sizeof(struct virtqueue)); + ASSERT(virtq); + + virtq->len = len; + + /* See: 2.6 Split Virtqueues */ + + virtq->desc = (FAR struct virtqueue_desc *) + kmm_memalign(16, 16 * len); + ASSERT(virtq->desc); + + virtq->avail = (FAR struct virtqueue_avail *) + kmm_memalign(2, 6 + 2 * len); + ASSERT(virtq->avail); + + virtq->used = (FAR struct virtqueue_used *) + kmm_memalign(4, 6 + 8 * len); + ASSERT(virtq->used); + + virtq->desc_virt = (FAR void **) + kmm_memalign(16, sizeof(FAR void *) * len); + ASSERT(virtq->desc_virt); + + _info("virtq=%p (len=%" PRId32 ")\n", virtq, len); + _info("virtq->desc=%p \n", virtq->desc); + _info("virtq->avail=%p \n", virtq->avail); + _info("virtq->used=%p \n", virtq->used); + + virtq->avail->idx = 0; + virtq->used->idx = 0; + virtq->last_used_idx = 0; + + return virtq; +} + +/**************************************************************************** + * Name: virtq_dev_init + ****************************************************************************/ + +static int virtio_dev_init(uintptr_t virt, uint32_t irq) +{ + FAR struct virtio_mmio_regs *regs = (FAR struct virtio_mmio_regs *)virt; + int ret = -1; + uint32_t val; + + _info("examine virtio at 0x%" PRIxPTR "\n", virt); + + val = getreg32(®s->magic_value); + + if (VIRTIO_MAGIC != val) + { + _err("error: virtio at 0x%" PRIxPTR + " had wrong magic value 0x%" PRIx32 "\n", virt, val); + return ret; + } + + val = getreg32(®s->version); + + if (VIRTIO_VERSION != val) + { + _err("error: virtio at 0x%" PRIxPTR + " had wrong version 0x%" PRIx32 "\n", virt, val); + return ret; + } + + /* Reset */ + + putreg32(0, ®s->status); + mb(); + + /* Set ack */ + + val = getreg32(®s->status) | VIRTIO_STATUS_ACKNOWLEDGE; + putreg32(val, ®s->status); + mb(); + + /* Set driver */ + + val = getreg32(®s->status) | VIRTIO_STATUS_DRIVER; + putreg32(val, ®s->status); + mb(); + + /* Check the device_id */ + + val = getreg32(®s->device_id); + + switch (val) + { +#ifdef CONFIG_DRIVERS_VIRTIO_NET + case VIRTIO_DEV_NET: + ret = virtnet_init(regs, irq); + break; +#endif + default: + _warn("unsupported device_id 0x%" PRIx32 "\n", val); + } + + return ret; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: virtq_alloc_desc + ****************************************************************************/ + +uint32_t virtq_alloc_desc(FAR struct virtqueue *virtq, + uint32_t idx, FAR void *addr) +{ + uint32_t id = idx % virtq->len; + + _info("virtq=%p, idx=%" PRId32 "\n", virtq, idx); + + virtq->desc[id].addr = (uintptr_t)addr; + virtq->desc_virt[id] = addr; + return id; +} + +/**************************************************************************** + * Name: virtq_add_to_device + ****************************************************************************/ + +void virtq_add_to_device(FAR struct virtio_mmio_regs *regs, + FAR struct virtqueue *virtq, + uint32_t queue_sel) +{ + _info("==== queue_sel=%" PRId32 ", virtq->len=%" PRId32 "\n", + queue_sel, virtq->len); + + putreg32(queue_sel, ®s->queue_sel); + mb(); + + putreg32(virtq->len, ®s->queue_num); + + putreg32((uint32_t)(ptr_to_uint64(virtq->desc)), + ®s->queue_desc_low); + putreg32((uint32_t)(ptr_to_uint64(virtq->desc) >> 32), + ®s->queue_desc_high); + + putreg32((uint32_t)(ptr_to_uint64(virtq->avail)), + ®s->queue_avail_low); + putreg32((uint32_t)(ptr_to_uint64(virtq->avail) >> 32), + ®s->queue_avail_high); + + putreg32((uint32_t)(ptr_to_uint64(virtq->used)), + ®s->queue_used_low); + putreg32((uint32_t)(ptr_to_uint64(virtq->used) >> 32), + ®s->queue_used_high); + + mb(); + putreg32(1, ®s->queue_ready); +} + +/**************************************************************************** + * Name: virtio_init + ****************************************************************************/ + +void virtio_init(void) +{ + uintptr_t virtio = (uintptr_t)CONFIG_DRIVERS_VIRTIO_BASE; + uint32_t irq = CONFIG_DRIVERS_VIRTIO_IRQ; + uint32_t size = CONFIG_DRIVERS_VIRTIO_REGSIZE; + uint32_t i; + + for (i = 0; i < CONFIG_DRIVERS_VIRTIO_NUM; i++) + { + virtio_dev_init(virtio + size * i, irq + i); Review Comment: Yes -- This is an automated message from the Apache Git Service. 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