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1 /*
2 * Definitions for virtio-pci
3 *
4 * Copyright 2025 IBM Corp.
5 * Author(s): Jared Rossi <jrossi@linux.ibm.com>
6 *
7 * SPDX-License-Identifier: GPL-2.0-or-later
8 */
9
10 #ifndef VIRTIO_PCI_H
11 #define VIRTIO_PCI_H
12
13 /* Common configuration */
14 #define VPCI_CAP_COMMON_CFG 1
15 /* Notifications */
16 #define VPCI_CAP_NOTIFY_CFG 2
17 /* ISR access */
18 #define VPCI_CAP_ISR_CFG 3
19 /* Device specific configuration */
20 #define VPCI_CAP_DEVICE_CFG 4
21 /* PCI configuration access */
22 #define VPCI_CAP_PCI_CFG 5
23 /* Additional shared memory capability */
24 #define VPCI_CAP_SHARED_MEMORY_CFG 8
25 /* PCI vendor data configuration */
26 #define VPCI_CAP_VENDOR_CFG 9
27
28 /* Offsets within capability header */
29 #define VPCI_CAP_VNDR 0
30 #define VPCI_CAP_NEXT 1
31 #define VPCI_CAP_LEN 2
32 #define VPCI_CAP_CFG_TYPE 3
33 #define VPCI_CAP_BAR 4
34 #define VPCI_CAP_OFFSET 8
35 #define VPCI_CAP_LENGTH 12
36
37 #define VPCI_N_CAP_MULT 16 /* Notify multiplier, VPCI_CAP_NOTIFY_CFG only */
38
39 /* Common Area Offsets for virtio-pci queue */
40 #define VPCI_C_OFFSET_DFSELECT 0
41 #define VPCI_C_OFFSET_DF 4
42 #define VPCI_C_OFFSET_GFSELECT 8
43 #define VPCI_C_OFFSET_GF 12
44 #define VPCI_C_COMMON_NUMQ 18
45 #define VPCI_C_OFFSET_STATUS 20
46 #define VPCI_C_OFFSET_Q_SELECT 22
47 #define VPCI_C_OFFSET_Q_SIZE 24
48 #define VPCI_C_OFFSET_Q_ENABLE 28
49 #define VPCI_C_OFFSET_Q_NOFF 30
50 #define VPCI_C_OFFSET_Q_DESCLO 32
51 #define VPCI_C_OFFSET_Q_DESCHI 36
52 #define VPCI_C_OFFSET_Q_AVAILLO 40
53 #define VPCI_C_OFFSET_Q_AVAILHI 44
54 #define VPCI_C_OFFSET_Q_USEDLO 48
55 #define VPCI_C_OFFSET_Q_USEDHI 52
56
57 #define VIRTIO_F_VERSION_1 1 /* Feature bit 32 */
58
59 #define PCI_VENDOR_VIRTIO 0x1af4
60
61 struct VirtioPciCap {
62 uint8_t bar; /* Which PCIAS it's in */
63 uint32_t off; /* Offset within bar */
64 };
65 typedef struct VirtioPciCap VirtioPciCap;
66
67 void virtio_pci_id2type(VDev *vdev, uint16_t device_id);
68 int virtio_pci_reset(VDev *vdev);
69 long virtio_pci_notify(VRing *vr);
70 bool virtio_pci_is_supported(VDev *vdev);
71 int virtio_pci_setup(VDev *vdev);
72 int virtio_pci_setup_device(void);
73
74 int vpci_read_flex(uint64_t offset, uint8_t pcias, void *buf, int len);
75 int vpci_read_bswap64(uint64_t offset, uint8_t pcias, uint64_t *buf);
76 int vpci_read_bswap32(uint64_t offset, uint8_t pcias, uint32_t *buf);
77 int vpci_read_bswap16(uint64_t offset, uint8_t pcias, uint16_t *buf);
78 int vpci_read_byte(uint64_t offset, uint8_t pcias, uint8_t *buf);
79
80 int vpci_bswap64_write(uint64_t offset, uint8_t pcias, uint64_t data);
81 int vpci_bswap32_write(uint64_t offset, uint8_t pcias, uint32_t data);
82 int vpci_bswap16_write(uint64_t offset, uint8_t pcias, uint16_t data);
83 int vpci_write_byte(uint64_t offset, uint8_t pcias, uint8_t data);
84
85 #endif