325 lines
7.4 KiB
C
325 lines
7.4 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-11-11 GuEe-GUI the first version
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*/
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#include <rtthread.h>
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#include <cpuport.h>
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#include <virtio.h>
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rt_inline void _virtio_dev_check(struct virtio_device *dev)
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{
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RT_ASSERT(dev != RT_NULL);
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RT_ASSERT(dev->mmio_config != RT_NULL);
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}
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void virtio_reset_device(struct virtio_device *dev)
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{
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_virtio_dev_check(dev);
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dev->mmio_config->status = 0;
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}
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void virtio_status_acknowledge_driver(struct virtio_device *dev)
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{
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_virtio_dev_check(dev);
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dev->mmio_config->status |= VIRTIO_STATUS_ACKNOWLEDGE | VIRTIO_STATUS_DRIVER;
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}
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void virtio_status_driver_ok(struct virtio_device *dev)
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{
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_virtio_dev_check(dev);
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dev->mmio_config->status |= VIRTIO_STATUS_FEATURES_OK | VIRTIO_STATUS_DRIVER_OK;
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}
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void virtio_interrupt_ack(struct virtio_device *dev)
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{
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rt_uint32_t status;
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_virtio_dev_check(dev);
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status = dev->mmio_config->interrupt_status;
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if (status != 0)
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{
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dev->mmio_config->interrupt_ack = status;
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}
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}
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rt_bool_t virtio_has_feature(struct virtio_device *dev, rt_uint32_t feature_bit)
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{
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_virtio_dev_check(dev);
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return !!(dev->mmio_config->device_features & (1UL << feature_bit));
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}
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rt_err_t virtio_queues_alloc(struct virtio_device *dev, rt_size_t queues_num)
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{
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_virtio_dev_check(dev);
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dev->queues = rt_malloc(sizeof(struct virtq) * queues_num);
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if (dev->queues != RT_NULL)
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{
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dev->queues_num = queues_num;
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return RT_EOK;
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}
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return -RT_ENOMEM;
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}
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void virtio_queues_free(struct virtio_device *dev)
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{
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if (dev->queues != RT_NULL)
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{
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dev->queues_num = 0;
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rt_free(dev->queues);
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}
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}
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rt_err_t virtio_queue_init(struct virtio_device *dev, rt_uint32_t queue_index, rt_size_t ring_size)
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{
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int i;
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void *pages;
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rt_size_t pages_total_size;
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struct virtq *queue;
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_virtio_dev_check(dev);
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RT_ASSERT(dev->mmio_config->queue_num_max > 0);
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RT_ASSERT(dev->mmio_config->queue_num_max > queue_index);
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/* ring_size is power of 2 */
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RT_ASSERT(ring_size > 0);
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RT_ASSERT(((ring_size - 1) & ring_size) == 0);
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queue = &dev->queues[queue_index];
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pages_total_size = VIRTIO_PAGE_ALIGN(
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VIRTQ_DESC_TOTAL_SIZE(ring_size) + VIRTQ_AVAIL_TOTAL_SIZE(ring_size)) + VIRTQ_USED_TOTAL_SIZE(ring_size);
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pages = rt_malloc_align(pages_total_size, VIRTIO_PAGE_SIZE);
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if (pages == RT_NULL)
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{
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return -RT_ENOMEM;
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}
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queue->free = rt_malloc(sizeof(rt_bool_t) * ring_size);
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if (queue->free == RT_NULL)
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{
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rt_free_align(pages);
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return -RT_ENOMEM;
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}
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rt_memset(pages, 0, pages_total_size);
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dev->mmio_config->guest_page_size = VIRTIO_PAGE_SIZE;
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dev->mmio_config->queue_sel = queue_index;
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dev->mmio_config->queue_num = ring_size;
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dev->mmio_config->queue_align = VIRTIO_PAGE_SIZE;
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dev->mmio_config->queue_pfn = VIRTIO_VA2PA(pages) >> VIRTIO_PAGE_SHIFT;
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queue->num = ring_size;
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queue->desc = (struct virtq_desc *)((rt_ubase_t)pages);
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queue->avail = (struct virtq_avail *)(((rt_ubase_t)pages) + VIRTQ_DESC_TOTAL_SIZE(ring_size));
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queue->used = (struct virtq_used *)VIRTIO_PAGE_ALIGN(
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(rt_ubase_t)&queue->avail->ring[ring_size] + VIRTQ_AVAIL_RES_SIZE);
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queue->used_idx = 0;
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/* All descriptors start out unused */
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for (i = 0; i < ring_size; ++i)
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{
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queue->free[i] = RT_TRUE;
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}
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queue->free_count = ring_size;
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return RT_EOK;
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}
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void virtio_queue_destroy(struct virtio_device *dev, rt_uint32_t queue_index)
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{
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struct virtq *queue;
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_virtio_dev_check(dev);
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RT_ASSERT(dev->mmio_config->queue_num_max > 0);
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RT_ASSERT(dev->mmio_config->queue_num_max > queue_index);
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queue = &dev->queues[queue_index];
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RT_ASSERT(queue->num > 0);
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rt_free(queue->free);
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rt_free_align((void *)queue->desc);
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dev->mmio_config->queue_sel = queue_index;
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dev->mmio_config->queue_pfn = RT_NULL;
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queue->num = 0;
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queue->desc = RT_NULL;
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queue->avail = RT_NULL;
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queue->used = RT_NULL;
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}
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void virtio_queue_notify(struct virtio_device *dev, rt_uint32_t queue_index)
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{
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_virtio_dev_check(dev);
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dev->mmio_config->queue_notify = queue_index;
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}
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void virtio_submit_chain(struct virtio_device *dev, rt_uint32_t queue_index, rt_uint16_t desc_index)
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{
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rt_size_t ring_size;
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struct virtq *queue;
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_virtio_dev_check(dev);
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queue = &dev->queues[queue_index];
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ring_size = queue->num;
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/* Tell the device the first index in our chain of descriptors */
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queue->avail->ring[queue->avail->idx % ring_size] = desc_index;
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rt_hw_dsb();
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/* Tell the device another avail ring entry is available */
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queue->avail->idx++;
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rt_hw_dsb();
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}
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rt_uint16_t virtio_alloc_desc(struct virtio_device *dev, rt_uint32_t queue_index)
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{
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int i;
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struct virtq *queue;
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_virtio_dev_check(dev);
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RT_ASSERT(queue_index < dev->queues_num);
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queue = &dev->queues[queue_index];
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if (queue->free_count > 0)
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{
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rt_size_t ring_size = queue->num;
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for (i = 0; i < ring_size; ++i)
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{
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if (queue->free[i])
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{
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queue->free[i] = RT_FALSE;
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queue->free_count--;
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return (rt_uint16_t)i;
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}
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}
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}
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return VIRTQ_INVALID_DESC_ID;
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}
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void virtio_free_desc(struct virtio_device *dev, rt_uint32_t queue_index, rt_uint16_t desc_index)
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{
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struct virtq *queue;
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_virtio_dev_check(dev);
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queue = &dev->queues[queue_index];
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RT_ASSERT(queue_index < dev->queues_num);
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RT_ASSERT(!queue->free[desc_index]);
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queue->desc[desc_index].addr = 0;
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queue->desc[desc_index].len = 0;
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queue->desc[desc_index].flags = 0;
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queue->desc[desc_index].next = 0;
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queue->free[desc_index] = RT_TRUE;
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queue->free_count++;
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}
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rt_err_t virtio_alloc_desc_chain(struct virtio_device *dev, rt_uint32_t queue_index, rt_size_t count,
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rt_uint16_t *indexs)
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{
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int i, j;
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_virtio_dev_check(dev);
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RT_ASSERT(indexs != RT_NULL);
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if (dev->queues[queue_index].free_count < count)
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{
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return -RT_ERROR;
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}
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for (i = 0; i < count; ++i)
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{
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indexs[i] = virtio_alloc_desc(dev, queue_index);
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if (indexs[i] == VIRTQ_INVALID_DESC_ID)
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{
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for (j = 0; j < i; ++j)
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{
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virtio_free_desc(dev, queue_index, indexs[j]);
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}
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return -RT_ERROR;
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}
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}
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return RT_EOK;
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}
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void virtio_free_desc_chain(struct virtio_device *dev, rt_uint32_t queue_index, rt_uint16_t desc_index)
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{
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rt_uint16_t flags, next;
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struct virtq_desc *desc;
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_virtio_dev_check(dev);
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desc = &dev->queues[queue_index].desc[0];
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for (;;)
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{
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flags = desc[desc_index].flags;
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next = desc[desc_index].next;
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virtio_free_desc(dev, queue_index, desc_index);
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if (flags & VIRTQ_DESC_F_NEXT)
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{
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desc_index = next;
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}
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else
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{
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break;
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}
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}
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}
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void virtio_fill_desc(struct virtio_device *dev, rt_uint32_t queue_index, rt_uint16_t desc_index,
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rt_uint64_t addr, rt_uint32_t len, rt_uint16_t flags, rt_uint16_t next)
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{
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struct virtq_desc *desc;
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_virtio_dev_check(dev);
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desc = &dev->queues[queue_index].desc[desc_index];
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desc->addr = addr;
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desc->len = len;
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desc->flags = flags;
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desc->next = next;
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}
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