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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Based on virtio_mmio.c
* Copyright 2011-2014, ARM Ltd.
*
* Copyright 2022-2023 Virtual Open Systems SAS.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __LOOPBACK_H__
#define __LOOPBACK_H__
#define DRIVER "LOOPBACK"
/* max Minor devices */
#define MAX_DEV 1
/* Define mmap elements limit */
#define MMAP_LIMIT 200
#ifdef DEBUG
#define DBG(...) pr_crit(__VA_ARGS__)
#else
#define DBG(...)
#endif /* DEBUG */
/*
* The alignment to use between consumer and producer parts of vring.
* Currently hardcoded to the page size.
*/
#define VIRTIO_MMIO_VRING_ALIGN PAGE_SIZE
#define to_virtio_mmio_device(_plat_dev) \
container_of(_plat_dev, struct virtio_mmio_device, vdev)
typedef struct virtio_device_info_struct {
unsigned long magic;
unsigned long version;
unsigned long device_id;
unsigned long vendor;
} virtio_device_info_struct_t;
typedef struct virtio_neg {
uint64_t notification;
uint64_t data;
uint64_t size;
bool read;
atomic_t done;
} virtio_neg_t;
struct virtio_mmio_device {
struct virtio_device vdev;
struct platform_device *pdev;
void __iomem *base;
unsigned long version;
/* A list of queues so we can dispatch IRQs */
spinlock_t lock;
struct list_head virtqueues;
};
struct virtio_mmio_vq_info {
/* the actual virtqueue */
struct virtqueue *vq;
/* the list node for the virtqueues list */
struct list_head node;
};
/*
* Print the pdev:
*
*static void print_virtio_pdev(struct platform_device *pdev)
*{
* int i;
*
* pr_info("Print the pdev:\n");
* pr_info("\t.name = %s\n", pdev->name);
* pr_info("\t.id = %d\n", pdev->id);
* pr_info("\t.num_resources = %d\n", pdev->num_resources);
*
* for (i=0; i < pdev->num_resources; i++) {
* pr_info("\t.num_resource = %d\n", i);
* pr_info("\t\t.start = 0x%llx\n", pdev->resource[i].start);
* pr_info("\t\t.end = 0x%llx\n", pdev->resource[i].end);
* pr_info("\t\t.flags = 0x%lx\n", pdev->resource[i].flags);
* }
*}
*
*Result:
*
* .name = a003e00.virtio_mmio
* .id = -1
* .num_resources = 2
* .num_resource = 0
* .start = 0xa003e00
* .end = 0xa003fff
* .flags = 0x200
* .num_resource = 1
* .start = 0x2c
* .end = 0x2c
* .flags = 0x401
*/
/* mmap finctionality */
#ifndef VM_RESERVED
#define VM_RESERVED (VM_DONTEXPAND | VM_DONTDUMP)
#endif
struct mmap_info {
void *data;
int reference;
};
void print_neg_flag(uint64_t neg_flag, bool read)
{
if (read)
DBG("Read:\n");
else
DBG("Write:\n");
switch (neg_flag) {
case VIRTIO_MMIO_MAGIC_VALUE: //0x000
DBG("\tVIRTIO_MMIO_MAGIC_VALUE\n");
break;
case VIRTIO_MMIO_VERSION: //0x004
DBG("\tVIRTIO_MMIO_VERSION\n");
break;
case VIRTIO_MMIO_DEVICE_ID: //0x008
DBG("\tVIRTIO_MMIO_DEVICE_ID\n");
break;
case VIRTIO_MMIO_VENDOR_ID: //0x00c
DBG("\tVIRTIO_MMIO_VENDOR_ID\n");
break;
case VIRTIO_MMIO_DEVICE_FEATURES: //0x010
DBG("\tVIRTIO_MMIO_DEVICE_FEATURES\n");
break;
case VIRTIO_MMIO_DEVICE_FEATURES_SEL: //0x014
DBG("\tVIRTIO_MMIO_DEVICE_FEATURES_SEL\n");
break;
case VIRTIO_MMIO_DRIVER_FEATURES: //0x020
DBG("\tVIRTIO_MMIO_DRIVER_FEATURES\n");
break;
case VIRTIO_MMIO_DRIVER_FEATURES_SEL: //0x024
DBG("\tVIRTIO_MMIO_DRIVER_FEATURES_SEL\n");
break;
case VIRTIO_MMIO_GUEST_PAGE_SIZE: //0x028
DBG("\tVIRTIO_MMIO_GUEST_PAGE_SIZE\n");
break;
case VIRTIO_MMIO_QUEUE_SEL: //0x030
DBG("\tVIRTIO_MMIO_QUEUE_SEL\n");
break;
case VIRTIO_MMIO_QUEUE_NUM_MAX: //0x034
DBG("\tVIRTIO_MMIO_QUEUE_NUM_MAX\n");
break;
case VIRTIO_MMIO_QUEUE_NUM: //0x038
DBG("\tVIRTIO_MMIO_QUEUE_NUM\n");
break;
case VIRTIO_MMIO_QUEUE_ALIGN: //0x03c
DBG("\tVIRTIO_MMIO_QUEUE_ALIGN\n");
break;
case VIRTIO_MMIO_QUEUE_PFN: //0x040
DBG("\tVIRTIO_MMIO_QUEUE_PFN\n");
break;
case VIRTIO_MMIO_QUEUE_READY: //0x044
DBG("\tVIRTIO_MMIO_QUEUE_READY\n");
break;
case VIRTIO_MMIO_QUEUE_NOTIFY: //0x050
DBG("\tVIRTIO_MMIO_QUEUE_NOTIFY\n");
break;
case VIRTIO_MMIO_INTERRUPT_STATUS: //0x060
DBG("\tVIRTIO_MMIO_INTERRUPT_STATUS\n");
break;
case VIRTIO_MMIO_INTERRUPT_ACK: //0x064
DBG("\tVIRTIO_MMIO_INTERRUPT_ACK\n");
break;
case VIRTIO_MMIO_STATUS: //0x070
DBG("\tVIRTIO_MMIO_STATUS\n");
break;
case VIRTIO_MMIO_QUEUE_DESC_LOW: //0x080
DBG("\tVIRTIO_MMIO_QUEUE_DESC_LOW\n");
break;
case VIRTIO_MMIO_QUEUE_DESC_HIGH: //0x084
DBG("\tVIRTIO_MMIO_QUEUE_DESC_HIGH\n");
break;
case VIRTIO_MMIO_QUEUE_AVAIL_LOW: //0x090
DBG("\tVIRTIO_MMIO_QUEUE_AVAIL_LOW\n");
break;
case VIRTIO_MMIO_QUEUE_AVAIL_HIGH: //0x094
DBG("\tVIRTIO_MMIO_QUEUE_AVAIL_HIGH\n");
break;
case VIRTIO_MMIO_QUEUE_USED_LOW: //0x0a0
DBG("\tVIRTIO_MMIO_QUEUE_USED_LOW\n");
break;
case VIRTIO_MMIO_QUEUE_USED_HIGH: //0x0a4
DBG("\tVIRTIO_MMIO_QUEUE_USED_HIGH\n");
break;
case VIRTIO_MMIO_SHM_SEL: //0x0ac
DBG("\tVIRTIO_MMIO_SHM_SEL\n");
break;
case VIRTIO_MMIO_SHM_LEN_LOW: //0x0b0
DBG("\tVIRTIO_MMIO_SHM_LEN_LOW\n");
break;
case VIRTIO_MMIO_SHM_LEN_HIGH: //0x0b4
DBG("\tVIRTIO_MMIO_SHM_LEN_HIGH\n");
break;
case VIRTIO_MMIO_SHM_BASE_LOW: //0x0b8
DBG("\tVIRTIO_MMIO_SHM_BASE_LOW\n");
break;
case VIRTIO_MMIO_SHM_BASE_HIGH: //0x0bc
DBG("\tVIRTIO_MMIO_SHM_BASE_HIGH\n");
break;
case VIRTIO_MMIO_CONFIG_GENERATION: //0x0fc
DBG("\tVIRTIO_MMIO_CONFIG_GENERATION\n");
break;
default:
if (neg_flag >= VIRTIO_MMIO_CONFIG)
DBG("\tVIRTIO_MMIO_CONFIG\n");
else
DBG("\tNegotiation flag Unknown: %lld\n", neg_flag);
return;
}
}
void print_data(const void *buf, size_t size)
{
int offset = 10;
int i, j;
DBG("Print data from linux virtio-rng side:\n");
printk(KERN_CRIT "");
for (i = 0; i < size; i += offset) {
printk(KERN_CONT "\t\t");
for (j = i; (j < i + offset) && (j < size); j++)
printk(KERN_CONT "%d, ", *((uint8_t *)(buf + j)));
printk(KERN_CRIT "");
}
}
typedef struct efd_data {
int efd[2];
int pid;
} efd_data_t;
/*
* ref: https://elixir.bootlin.com/linux/latest/source/arch/x86/mm/init_64.c#L1419
*/
/* IOCTL defines */
#define EFD_INIT _IOC(_IOC_WRITE, 'k', 1, sizeof(efd_data))
#define WAKEUP _IOC(_IOC_WRITE, 'k', 2, 0)
#define START_LOOPBACK _IOC(_IOC_WRITE, 'k', 3, sizeof(virtio_device_info_struct_t))
#define IRQ _IOC(_IOC_WRITE, 'k', 4, sizeof(int))
#define SHARE_VQS _IOC(_IOC_WRITE, 'k', 5, sizeof(uint32_t))
#define SHARE_BUF _IOC(_IOC_WRITE, 'k', 6, sizeof(uint64_t))
#define SHARE_COM_STRUCT _IOC(_IOC_WRITE, 'k', 7, 0)
/* device data holder, this structure may be extended to hold additional data */
struct loopback_device_data {
struct cdev cdev;
};
#endif /* __VIRTUALNET_H__ */
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