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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-9-16 GuEe-GUI the first version
* 2021-11-11 GuEe-GUI using virtio common interface
*/
#include <rthw.h>
#include <rtthread.h>
#include <cpuport.h>
#include <rtdevice.h>
#ifdef RT_USING_VIRTIO_BLK
#include <virtio_blk.h>
static void virtio_blk_rw(struct virtio_blk_device *virtio_blk_dev, rt_off_t pos, void *buffer, rt_size_t count,
int flags)
{
rt_uint16_t idx[3];
rt_size_t size = count * virtio_blk_dev->config->blk_size;
struct virtio_device *virtio_dev = &virtio_blk_dev->virtio_dev;
#ifdef RT_USING_SMP
rt_base_t level = rt_spin_lock_irqsave(&virtio_dev->spinlock);
#endif
/* Allocate 3 descriptors */
while (virtio_alloc_desc_chain(virtio_dev, 0, 3, idx))
{
#ifdef RT_USING_SMP
rt_spin_unlock_irqrestore(&virtio_dev->spinlock, level);
#endif
rt_thread_yield();
#ifdef RT_USING_SMP
level = rt_spin_lock_irqsave(&virtio_dev->spinlock);
#endif
}
virtio_blk_dev->info[idx[0]].status = 0xff;
virtio_blk_dev->info[idx[0]].valid = RT_TRUE;
virtio_blk_dev->info[idx[0]].req.type = flags;
virtio_blk_dev->info[idx[0]].req.ioprio = 0;
virtio_blk_dev->info[idx[0]].req.sector = pos * (virtio_blk_dev->config->blk_size / 512);
flags = flags == VIRTIO_BLK_T_OUT ? 0 : VIRTQ_DESC_F_WRITE;
virtio_fill_desc(virtio_dev, VIRTIO_BLK_QUEUE, idx[0],
VIRTIO_VA2PA(&virtio_blk_dev->info[idx[0]].req), sizeof(struct virtio_blk_req), VIRTQ_DESC_F_NEXT, idx[1]);
virtio_fill_desc(virtio_dev, VIRTIO_BLK_QUEUE, idx[1],
VIRTIO_VA2PA(buffer), size, flags | VIRTQ_DESC_F_NEXT, idx[2]);
virtio_fill_desc(virtio_dev, VIRTIO_BLK_QUEUE, idx[2],
VIRTIO_VA2PA(&virtio_blk_dev->info[idx[0]].status), sizeof(rt_uint8_t), VIRTQ_DESC_F_WRITE, 0);
virtio_submit_chain(virtio_dev, VIRTIO_BLK_QUEUE, idx[0]);
virtio_queue_notify(virtio_dev, VIRTIO_BLK_QUEUE);
/* Wait for virtio_blk_isr() to done */
while (virtio_blk_dev->info[idx[0]].valid)
{
#ifdef RT_USING_SMP
rt_spin_unlock_irqrestore(&virtio_dev->spinlock, level);
#endif
rt_thread_yield();
#ifdef RT_USING_SMP
level = rt_spin_lock_irqsave(&virtio_dev->spinlock);
#endif
}
virtio_free_desc_chain(virtio_dev, VIRTIO_BLK_QUEUE, idx[0]);
#ifdef RT_USING_SMP
rt_spin_unlock_irqrestore(&virtio_dev->spinlock, level);
#endif
}
static rt_ssize_t virtio_blk_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t count)
{
virtio_blk_rw((struct virtio_blk_device *)dev, pos, buffer, count, VIRTIO_BLK_T_IN);
return count;
}
static rt_ssize_t virtio_blk_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t count)
{
virtio_blk_rw((struct virtio_blk_device *)dev, pos, (void *)buffer, count, VIRTIO_BLK_T_OUT);
return count;
}
static rt_err_t virtio_blk_control(rt_device_t dev, int cmd, void *args)
{
rt_err_t status = RT_EOK;
struct virtio_blk_device *virtio_blk_dev = (struct virtio_blk_device *)dev;
switch (cmd)
{
case RT_DEVICE_CTRL_BLK_GETGEOME:
{
struct rt_device_blk_geometry *geometry = (struct rt_device_blk_geometry *)args;
if (geometry == RT_NULL)
{
status = -RT_ERROR;
break;
}
geometry->bytes_per_sector = VIRTIO_BLK_BYTES_PER_SECTOR;
geometry->block_size = virtio_blk_dev->config->blk_size;
geometry->sector_count = virtio_blk_dev->config->capacity;
}
break;
default:
status = -RT_EINVAL;
break;
}
return status;
}
#ifdef RT_USING_DEVICE_OPS
const static struct rt_device_ops virtio_blk_ops =
{
RT_NULL,
RT_NULL,
RT_NULL,
virtio_blk_read,
virtio_blk_write,
virtio_blk_control
};
#endif
static void virtio_blk_isr(int irqno, void *param)
{
rt_uint32_t id;
struct virtio_blk_device *virtio_blk_dev = (struct virtio_blk_device *)param;
struct virtio_device *virtio_dev = &virtio_blk_dev->virtio_dev;
struct virtq *queue = &virtio_dev->queues[VIRTIO_BLK_QUEUE];
#ifdef RT_USING_SMP
rt_base_t level = rt_spin_lock_irqsave(&virtio_dev->spinlock);
#endif
virtio_interrupt_ack(virtio_dev);
rt_hw_dsb();
/* The device increments disk.used->idx when it adds an entry to the used ring */
while (queue->used_idx != queue->used->idx)
{
rt_hw_dsb();
id = queue->used->ring[queue->used_idx % queue->num].id;
RT_ASSERT(virtio_blk_dev->info[id].status == 0);
/* Done with buffer */
virtio_blk_dev->info[id].valid = RT_FALSE;
queue->used_idx++;
}
#ifdef RT_USING_SMP
rt_spin_unlock_irqrestore(&virtio_dev->spinlock, level);
#endif
}
rt_err_t rt_virtio_blk_init(rt_ubase_t *mmio_base, rt_uint32_t irq)
{
static int dev_no = 0;
char dev_name[RT_NAME_MAX];
struct virtio_device *virtio_dev;
struct virtio_blk_device *virtio_blk_dev;
virtio_blk_dev = rt_malloc(sizeof(struct virtio_blk_device));
if (virtio_blk_dev == RT_NULL)
{
return -RT_ENOMEM;
}
virtio_dev = &virtio_blk_dev->virtio_dev;
virtio_dev->irq = irq;
virtio_dev->mmio_base = mmio_base;
virtio_blk_dev->config = (struct virtio_blk_config *)virtio_dev->mmio_config->config;
#ifdef RT_USING_SMP
rt_spin_lock_init(&virtio_dev->spinlock);
#endif
virtio_reset_device(virtio_dev);
virtio_status_acknowledge_driver(virtio_dev);
/* Negotiate features */
virtio_dev->mmio_config->driver_features = virtio_dev->mmio_config->device_features & ~(
(1 << VIRTIO_BLK_F_RO) |
(1 << VIRTIO_BLK_F_MQ) |
(1 << VIRTIO_BLK_F_SCSI) |
(1 << VIRTIO_BLK_F_CONFIG_WCE) |
(1 << VIRTIO_F_ANY_LAYOUT) |
(1 << VIRTIO_F_RING_EVENT_IDX) |
(1 << VIRTIO_F_RING_INDIRECT_DESC));
/* Tell device that feature negotiation is complete and we're completely ready */
virtio_status_driver_ok(virtio_dev);
if (virtio_queues_alloc(virtio_dev, 1) != RT_EOK)
{
goto _alloc_fail;
}
/* Initialize queue 0 */
if (virtio_queue_init(virtio_dev, 0, VIRTIO_BLK_QUEUE_RING_SIZE) != RT_EOK)
{
goto _alloc_fail;
}
virtio_blk_dev->parent.type = RT_Device_Class_Block;
#ifdef RT_USING_DEVICE_OPS
virtio_blk_dev->parent.ops = &virtio_blk_ops;
#else
virtio_blk_dev->parent.init = RT_NULL;
virtio_blk_dev->parent.open = RT_NULL;
virtio_blk_dev->parent.close = RT_NULL;
virtio_blk_dev->parent.read = virtio_blk_read;
virtio_blk_dev->parent.write = virtio_blk_write;
virtio_blk_dev->parent.control = virtio_blk_control;
#endif
rt_snprintf(dev_name, RT_NAME_MAX, "virtio-blk%d", dev_no++);
rt_hw_interrupt_install(irq, virtio_blk_isr, virtio_blk_dev, dev_name);
rt_hw_interrupt_umask(irq);
return rt_device_register((rt_device_t)virtio_blk_dev, dev_name, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE);
_alloc_fail:
if (virtio_blk_dev != RT_NULL)
{
virtio_queues_free(virtio_dev);
rt_free(virtio_blk_dev);
}
return -RT_ENOMEM;
}
#endif /* RT_USING_VIRTIO_BLK */
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