/* * Virtio PCI driver * * This module allows virtio devices to be used over a virtual PCI device. * This can be used with QEMU based VMMs like KVM or Xen. * * Copyright IBM Corp. 2007 * * Authors: * Anthony Liguori * * This header is BSD licensed so anyone can use the definitions to implement * compatible drivers/servers. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of IBM nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _LINUX_VIRTIO_PCI_H #define _LINUX_VIRTIO_PCI_H #include "standard-headers/linux/types.h" #ifndef VIRTIO_PCI_NO_LEGACY /* A 32-bit r/o bitmask of the features supported by the host */ #define VIRTIO_PCI_HOST_FEATURES 0 /* A 32-bit r/w bitmask of features activated by the guest */ #define VIRTIO_PCI_GUEST_FEATURES 4 /* A 32-bit r/w PFN for the currently selected queue */ #define VIRTIO_PCI_QUEUE_PFN 8 /* A 16-bit r/o queue size for the currently selected queue */ #define VIRTIO_PCI_QUEUE_NUM 12 /* A 16-bit r/w queue selector */ #define VIRTIO_PCI_QUEUE_SEL 14 /* A 16-bit r/w queue notifier */ #define VIRTIO_PCI_QUEUE_NOTIFY 16 /* An 8-bit device status register. */ #define VIRTIO_PCI_STATUS 18 /* An 8-bit r/o interrupt status register. Reading the value will return the * current contents of the ISR and will also clear it. This is effectively * a read-and-acknowledge. */ #define VIRTIO_PCI_ISR 19 /* MSI-X registers: only enabled if MSI-X is enabled. */ /* A 16-bit vector for configuration changes. */ #define VIRTIO_MSI_CONFIG_VECTOR 20 /* A 16-bit vector for selected queue notifications. */ #define VIRTIO_MSI_QUEUE_VECTOR 22 /* The remaining space is defined by each driver as the per-driver * configuration space */ #define VIRTIO_PCI_CONFIG_OFF(msix_enabled) ((msix_enabled) ? 24 : 20) /* Deprecated: please use VIRTIO_PCI_CONFIG_OFF instead */ #define VIRTIO_PCI_CONFIG(dev) VIRTIO_PCI_CONFIG_OFF((dev)->msix_enabled) /* Virtio ABI version, this must match exactly */ #define VIRTIO_PCI_ABI_VERSION 0 /* How many bits to shift physical queue address written to QUEUE_PFN. * 12 is historical, and due to x86 page size. */ #define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12 /* The alignment to use between consumer and producer parts of vring. * x86 pagesize again. */ #define VIRTIO_PCI_VRING_ALIGN 4096 #endif /* VIRTIO_PCI_NO_LEGACY */ /* The bit of the ISR which indicates a device configuration change. */ #define VIRTIO_PCI_ISR_CONFIG 0x2 /* Vector value used to disable MSI for queue */ #define VIRTIO_MSI_NO_VECTOR 0xffff #ifndef VIRTIO_PCI_NO_MODERN /* IDs for different capabilities. Must all exist. */ /* Common configuration */ #define VIRTIO_PCI_CAP_COMMON_CFG 1 /* Notifications */ #define VIRTIO_PCI_CAP_NOTIFY_CFG 2 /* ISR access */ #define VIRTIO_PCI_CAP_ISR_CFG 3 /* Device specific configuration */ #define VIRTIO_PCI_CAP_DEVICE_CFG 4 /* PCI configuration access */ #define VIRTIO_PCI_CAP_PCI_CFG 5 /* Additional shared memory capability */ #define VIRTIO_PCI_CAP_SHARED_MEMORY_CFG 8 /* This is the PCI capability header: */ struct virtio_pci_cap { uint8_t cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */ uint8_t cap_next; /* Generic PCI field: next ptr. */ uint8_t cap_len; /* Generic PCI field: capability length */ uint8_t cfg_type; /* Identifies the structure. */ uint8_t bar; /* Where to find it. */ uint8_t id; /* Multiple capabilities of the same type */ uint8_t padding[2]; /* Pad to full dword. */ uint32_t offset; /* Offset within bar. */ uint32_t length; /* Length of the structure, in bytes. */ }; struct virtio_pci_cap64 { struct virtio_pci_cap cap; uint32_t offset_hi; /* Most sig 32 bits of offset */ uint32_t length_hi; /* Most sig 32 bits of length */ }; struct virtio_pci_notify_cap { struct virtio_pci_cap cap; uint32_t notify_off_multiplier; /* Multiplier for queue_notify_off. */ }; /* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */ struct virtio_pci_common_cfg { /* About the whole device. */ uint32_t device_feature_select; /* read-write */ uint32_t device_feature; /* read-only */ uint32_t guest_feature_select; /* read-write */ uint32_t guest_feature; /* read-write */ uint16_t msix_config; /* read-write */ uint16_t num_queues; /* read-only */ uint8_t device_status; /* read-write */ uint8_t config_generation; /* read-only */ /* About a specific virtqueue. */ uint16_t queue_select; /* read-write */ uint16_t queue_size; /* read-write, power of 2. */ uint16_t queue_msix_vector; /* read-write */ uint16_t queue_enable; /* read-write */ uint16_t queue_notify_off; /* read-only */ uint32_t queue_desc_lo; /* read-write */ uint32_t queue_desc_hi; /* read-write */ uint32_t queue_avail_lo; /* read-write */ uint32_t queue_avail_hi; /* read-write */ uint32_t queue_used_lo; /* read-write */ uint32_t queue_used_hi; /* read-write */ }; /* * Warning: do not use sizeof on this: use offsetofend for * specific fields you need. */ struct virtio_pci_modern_common_cfg { struct virtio_pci_common_cfg cfg; uint16_t queue_notify_data; /* read-write */ uint16_t queue_reset; /* read-write */ uint16_t admin_queue_index; /* read-only */ uint16_t admin_queue_num; /* read-only */ }; /* Fields in VIRTIO_PCI_CAP_PCI_CFG: */ struct virtio_pci_cfg_cap { struct virtio_pci_cap cap; uint8_t pci_cfg_data[4]; /* Data for BAR access. */ }; /* Macro versions of offsets for the Old Timers! */ #define VIRTIO_PCI_CAP_VNDR 0 #define VIRTIO_PCI_CAP_NEXT 1 #define VIRTIO_PCI_CAP_LEN 2 #define VIRTIO_PCI_CAP_CFG_TYPE 3 #define VIRTIO_PCI_CAP_BAR 4 #define VIRTIO_PCI_CAP_OFFSET 8 #define VIRTIO_PCI_CAP_LENGTH 12 #define VIRTIO_PCI_NOTIFY_CAP_MULT 16 #define VIRTIO_PCI_COMMON_DFSELECT 0 #define VIRTIO_PCI_COMMON_DF 4 #define VIRTIO_PCI_COMMON_GFSELECT 8 #define VIRTIO_PCI_COMMON_GF 12 #define VIRTIO_PCI_COMMON_MSIX 16 #define VIRTIO_PCI_COMMON_NUMQ 18 #define VIRTIO_PCI_COMMON_STATUS 20 #define VIRTIO_PCI_COMMON_CFGGENERATION 21 #define VIRTIO_PCI_COMMON_Q_SELECT 22 #define VIRTIO_PCI_COMMON_Q_SIZE 24 #define VIRTIO_PCI_COMMON_Q_MSIX 26 #define VIRTIO_PCI_COMMON_Q_ENABLE 28 #define VIRTIO_PCI_COMMON_Q_NOFF 30 #define VIRTIO_PCI_COMMON_Q_DESCLO 32 #define VIRTIO_PCI_COMMON_Q_DESCHI 36 #define VIRTIO_PCI_COMMON_Q_AVAILLO 40 #define VIRTIO_PCI_COMMON_Q_AVAILHI 44 #define VIRTIO_PCI_COMMON_Q_USEDLO 48 #define VIRTIO_PCI_COMMON_Q_USEDHI 52 #define VIRTIO_PCI_COMMON_Q_NDATA 56 #define VIRTIO_PCI_COMMON_Q_RESET 58 #define VIRTIO_PCI_COMMON_ADM_Q_IDX 60 #define VIRTIO_PCI_COMMON_ADM_Q_NUM 62 #define LM_LOGGING_CTRL 0 #define LM_BASE_ADDR_LOW 4 #define LM_BASE_ADDR_HIGH 8 #define LM_END_ADDR_LOW 12 #define LM_END_ADDR_HIGH 16 #define LM_VRING_STATE_OFFSET 0x20 #endif /* VIRTIO_PCI_NO_MODERN */ /* Admin command status. */ #define VIRTIO_ADMIN_STATUS_OK 0 /* Admin command opcode. */ #define VIRTIO_ADMIN_CMD_LIST_QUERY 0x0 #define VIRTIO_ADMIN_CMD_LIST_USE 0x1 /* Admin command group type. */ #define VIRTIO_ADMIN_GROUP_TYPE_SRIOV 0x1 /* Transitional device admin command. */ #define VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_WRITE 0x2 #define VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_READ 0x3 #define VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_WRITE 0x4 #define VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ 0x5 #define VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO 0x6 struct QEMU_PACKED virtio_admin_cmd_hdr { uint16_t opcode; /* * 1 - SR-IOV * 2-65535 - reserved */ uint16_t group_type; /* Unused, reserved for future extensions. */ uint8_t reserved1[12]; uint64_t group_member_id; }; struct QEMU_PACKED virtio_admin_cmd_status { uint16_t status; uint16_t status_qualifier; /* Unused, reserved for future extensions. */ uint8_t reserved2[4]; }; struct QEMU_PACKED virtio_admin_cmd_legacy_wr_data { uint8_t offset; /* Starting offset of the register(s) to write. */ uint8_t reserved[7]; uint8_t registers[]; }; struct QEMU_PACKED virtio_admin_cmd_legacy_rd_data { uint8_t offset; /* Starting offset of the register(s) to read. */ }; #define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_END 0 #define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_OWNER_DEV 0x1 #define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_OWNER_MEM 0x2 #define VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO 4 struct QEMU_PACKED virtio_admin_cmd_notify_info_data { uint8_t flags; /* 0 = end of list, 1 = owner device, 2 = member device */ uint8_t bar; /* BAR of the member or the owner device */ uint8_t padding[6]; uint64_t offset; /* Offset within bar. */ }; struct virtio_admin_cmd_notify_info_result { struct virtio_admin_cmd_notify_info_data entries[VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO]; }; #endif