virtio_pcidev.h (2482B)
1 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */ 2 /* 3 * Copyright (C) 2021 Intel Corporation 4 * Author: Johannes Berg <johannes@sipsolutions.net> 5 */ 6 #ifndef _LINUX_VIRTIO_PCIDEV_H 7 #define _LINUX_VIRTIO_PCIDEV_H 8 #include "standard-headers/linux/types.h" 9 10 /** 11 * enum virtio_pcidev_ops - virtual PCI device operations 12 * @VIRTIO_PCIDEV_OP_RESERVED: reserved to catch errors 13 * @VIRTIO_PCIDEV_OP_CFG_READ: read config space, size is 1, 2, 4 or 8; 14 * the @data field should be filled in by the device (in little endian). 15 * @VIRTIO_PCIDEV_OP_CFG_WRITE: write config space, size is 1, 2, 4 or 8; 16 * the @data field contains the data to write (in little endian). 17 * @VIRTIO_PCIDEV_OP_MMIO_READ: read BAR mem/pio, size can be variable; 18 * the @data field should be filled in by the device (in little endian). 19 * @VIRTIO_PCIDEV_OP_MMIO_WRITE: write BAR mem/pio, size can be variable; 20 * the @data field contains the data to write (in little endian). 21 * @VIRTIO_PCIDEV_OP_MMIO_MEMSET: memset MMIO, size is variable but 22 * the @data field only has one byte (unlike @VIRTIO_PCIDEV_OP_MMIO_WRITE) 23 * @VIRTIO_PCIDEV_OP_INT: legacy INTx# pin interrupt, the addr field is 1-4 for 24 * the number 25 * @VIRTIO_PCIDEV_OP_MSI: MSI(-X) interrupt, this message basically transports 26 * the 16- or 32-bit write that would otherwise be done into memory, 27 * analogous to the write messages (@VIRTIO_PCIDEV_OP_MMIO_WRITE) above 28 * @VIRTIO_PCIDEV_OP_PME: Dummy message whose content is ignored (and should be 29 * all zeroes) to signal the PME# pin. 30 */ 31 enum virtio_pcidev_ops { 32 VIRTIO_PCIDEV_OP_RESERVED = 0, 33 VIRTIO_PCIDEV_OP_CFG_READ, 34 VIRTIO_PCIDEV_OP_CFG_WRITE, 35 VIRTIO_PCIDEV_OP_MMIO_READ, 36 VIRTIO_PCIDEV_OP_MMIO_WRITE, 37 VIRTIO_PCIDEV_OP_MMIO_MEMSET, 38 VIRTIO_PCIDEV_OP_INT, 39 VIRTIO_PCIDEV_OP_MSI, 40 VIRTIO_PCIDEV_OP_PME, 41 }; 42 43 /** 44 * struct virtio_pcidev_msg - virtio PCI device operation 45 * @op: the operation to do 46 * @bar: the bar (only with BAR read/write messages) 47 * @reserved: reserved 48 * @size: the size of the read/write (in bytes) 49 * @addr: the address to read/write 50 * @data: the data, normally @size long, but just one byte for 51 * %VIRTIO_PCIDEV_OP_MMIO_MEMSET 52 * 53 * Note: the fields are all in native (CPU) endian, however, the 54 * @data values will often be in little endian (see the ops above.) 55 */ 56 struct virtio_pcidev_msg { 57 uint8_t op; 58 uint8_t bar; 59 uint16_t reserved; 60 uint32_t size; 61 uint64_t addr; 62 uint8_t data[]; 63 }; 64 65 #endif /* _LINUX_VIRTIO_PCIDEV_H */