From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/include/uapi/linux/target_core_user.h | 148 +++++++++++++++++++++++++++ 1 file changed, 148 insertions(+) create mode 100644 kernel/include/uapi/linux/target_core_user.h (limited to 'kernel/include/uapi/linux/target_core_user.h') diff --git a/kernel/include/uapi/linux/target_core_user.h b/kernel/include/uapi/linux/target_core_user.h new file mode 100644 index 000000000..b67f99d3c --- /dev/null +++ b/kernel/include/uapi/linux/target_core_user.h @@ -0,0 +1,148 @@ +#ifndef __TARGET_CORE_USER_H +#define __TARGET_CORE_USER_H + +/* This header will be used by application too */ + +#include +#include + +#define TCMU_VERSION "2.0" + +/* + * Ring Design + * ----------- + * + * The mmaped area is divided into three parts: + * 1) The mailbox (struct tcmu_mailbox, below) + * 2) The command ring + * 3) Everything beyond the command ring (data) + * + * The mailbox tells userspace the offset of the command ring from the + * start of the shared memory region, and how big the command ring is. + * + * The kernel passes SCSI commands to userspace by putting a struct + * tcmu_cmd_entry in the ring, updating mailbox->cmd_head, and poking + * userspace via uio's interrupt mechanism. + * + * tcmu_cmd_entry contains a header. If the header type is PAD, + * userspace should skip hdr->length bytes (mod cmdr_size) to find the + * next cmd_entry. + * + * Otherwise, the entry will contain offsets into the mmaped area that + * contain the cdb and data buffers -- the latter accessible via the + * iov array. iov addresses are also offsets into the shared area. + * + * When userspace is completed handling the command, set + * entry->rsp.scsi_status, fill in rsp.sense_buffer if appropriate, + * and also set mailbox->cmd_tail equal to the old cmd_tail plus + * hdr->length, mod cmdr_size. If cmd_tail doesn't equal cmd_head, it + * should process the next packet the same way, and so on. + */ + +#define TCMU_MAILBOX_VERSION 2 +#define ALIGN_SIZE 64 /* Should be enough for most CPUs */ + +/* See https://gcc.gnu.org/onlinedocs/cpp/Stringification.html */ +#define xstr(s) str(s) +#define str(s) #s + +struct tcmu_mailbox { + __u16 version; + __u16 flags; + __u32 cmdr_off; + __u32 cmdr_size; + + __u32 cmd_head; + + /* Updated by user. On its own cacheline */ + __u32 cmd_tail __attribute__((__aligned__(ALIGN_SIZE))); + +} __packed; + +enum tcmu_opcode { + TCMU_OP_PAD = 0, + TCMU_OP_CMD, +}; + +/* + * Only a few opcodes, and length is 8-byte aligned, so use low bits for opcode. + */ +struct tcmu_cmd_entry_hdr { + __u32 len_op; + __u16 cmd_id; + __u8 kflags; +#define TCMU_UFLAG_UNKNOWN_OP 0x1 + __u8 uflags; + +} __packed; + +#define TCMU_OP_MASK 0x7 + +static inline enum tcmu_opcode tcmu_hdr_get_op(__u32 len_op) +{ + return len_op & TCMU_OP_MASK; +} + +static inline void tcmu_hdr_set_op(__u32 *len_op, enum tcmu_opcode op) +{ + *len_op &= ~TCMU_OP_MASK; + *len_op |= (op & TCMU_OP_MASK); +} + +static inline __u32 tcmu_hdr_get_len(__u32 len_op) +{ + return len_op & ~TCMU_OP_MASK; +} + +static inline void tcmu_hdr_set_len(__u32 *len_op, __u32 len) +{ + *len_op &= TCMU_OP_MASK; + *len_op |= len; +} + +/* Currently the same as SCSI_SENSE_BUFFERSIZE */ +#define TCMU_SENSE_BUFFERSIZE 96 + +struct tcmu_cmd_entry { + struct tcmu_cmd_entry_hdr hdr; + + union { + struct { + uint32_t iov_cnt; + uint32_t iov_bidi_cnt; + uint32_t iov_dif_cnt; + uint64_t cdb_off; + uint64_t __pad1; + uint64_t __pad2; + struct iovec iov[0]; + } req; + struct { + uint8_t scsi_status; + uint8_t __pad1; + uint16_t __pad2; + uint32_t __pad3; + char sense_buffer[TCMU_SENSE_BUFFERSIZE]; + } rsp; + }; + +} __packed; + +#define TCMU_OP_ALIGN_SIZE sizeof(uint64_t) + +enum tcmu_genl_cmd { + TCMU_CMD_UNSPEC, + TCMU_CMD_ADDED_DEVICE, + TCMU_CMD_REMOVED_DEVICE, + __TCMU_CMD_MAX, +}; +#define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1) + +enum tcmu_genl_attr { + TCMU_ATTR_UNSPEC, + TCMU_ATTR_DEVICE, + TCMU_ATTR_MINOR, + __TCMU_ATTR_MAX, +}; +#define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1) + +#endif -- cgit 1.2.3-korg