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linux_dsm_epyc7002/drivers/scsi/cxlflash/sislite.h
Matthew R. Ochs 696d0b0c71 scsi: cxlflash: Support SQ Command Mode 
The SISLite specification outlines a new queuing model to improve
over the MMIO-based IOARRIN model that exists today. This new model
uses a submission queue that exists in host memory and is shared with
the device. Each entry in the queue is an IOARCB that describes a
transfer request. When requests are submitted, IOARCBs ('current'
position tracked in host software) are populated and the submission
queue tail pointer is then updated via MMIO to make the device aware
of the requests.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-01-11 22:38:15 -05:00

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/*
* CXL Flash Device Driver
*
* Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
* Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
*
* Copyright (C) 2015 IBM Corporation
*
* 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.
*/
#ifndef _SISLITE_H
#define _SISLITE_H
#include <linux/types.h>
typedef u16 ctx_hndl_t;
typedef u32 res_hndl_t;
#define SIZE_4K 4096
#define SIZE_64K 65536
/*
* IOARCB: 64 bytes, min 16 byte alignment required, host native endianness
* except for SCSI CDB which remains big endian per SCSI standards.
*/
struct sisl_ioarcb {
u16 ctx_id; /* ctx_hndl_t */
u16 req_flags;
#define SISL_REQ_FLAGS_RES_HNDL 0x8000U /* bit 0 (MSB) */
#define SISL_REQ_FLAGS_PORT_LUN_ID 0x0000U
#define SISL_REQ_FLAGS_SUP_UNDERRUN 0x4000U /* bit 1 */
#define SISL_REQ_FLAGS_TIMEOUT_SECS 0x0000U /* bits 8,9 */
#define SISL_REQ_FLAGS_TIMEOUT_MSECS 0x0040U
#define SISL_REQ_FLAGS_TIMEOUT_USECS 0x0080U
#define SISL_REQ_FLAGS_TIMEOUT_CYCLES 0x00C0U
#define SISL_REQ_FLAGS_TMF_CMD 0x0004u /* bit 13 */
#define SISL_REQ_FLAGS_AFU_CMD 0x0002U /* bit 14 */
#define SISL_REQ_FLAGS_HOST_WRITE 0x0001U /* bit 15 (LSB) */
#define SISL_REQ_FLAGS_HOST_READ 0x0000U
union {
u32 res_hndl; /* res_hndl_t */
u32 port_sel; /* this is a selection mask:
* 0x1 -> port#0 can be selected,
* 0x2 -> port#1 can be selected.
* Can be bitwise ORed.
*/
};
u64 lun_id;
u32 data_len; /* 4K for read/write */
u32 ioadl_len;
union {
u64 data_ea; /* min 16 byte aligned */
u64 ioadl_ea;
};
u8 msi; /* LISN to send on RRQ write */
#define SISL_MSI_CXL_PFAULT 0 /* reserved for CXL page faults */
#define SISL_MSI_SYNC_ERROR 1 /* recommended for AFU sync error */
#define SISL_MSI_RRQ_UPDATED 2 /* recommended for IO completion */
#define SISL_MSI_ASYNC_ERROR 3 /* master only - for AFU async error */
u8 rrq; /* 0 for a single RRQ */
u16 timeout; /* in units specified by req_flags */
u32 rsvd1;
u8 cdb[16]; /* must be in big endian */
union {
u64 reserved; /* Reserved for IOARRIN mode */
struct sisl_ioasa *ioasa; /* IOASA EA for SQ Mode */
};
} __packed;
struct sisl_rc {
u8 flags;
#define SISL_RC_FLAGS_SENSE_VALID 0x80U
#define SISL_RC_FLAGS_FCP_RSP_CODE_VALID 0x40U
#define SISL_RC_FLAGS_OVERRUN 0x20U
#define SISL_RC_FLAGS_UNDERRUN 0x10U
u8 afu_rc;
#define SISL_AFU_RC_RHT_INVALID 0x01U /* user error */
#define SISL_AFU_RC_RHT_UNALIGNED 0x02U /* should never happen */
#define SISL_AFU_RC_RHT_OUT_OF_BOUNDS 0x03u /* user error */
#define SISL_AFU_RC_RHT_DMA_ERR 0x04u /* see afu_extra
may retry if afu_retry is off
possible on master exit
*/
#define SISL_AFU_RC_RHT_RW_PERM 0x05u /* no RW perms, user error */
#define SISL_AFU_RC_LXT_UNALIGNED 0x12U /* should never happen */
#define SISL_AFU_RC_LXT_OUT_OF_BOUNDS 0x13u /* user error */
#define SISL_AFU_RC_LXT_DMA_ERR 0x14u /* see afu_extra
may retry if afu_retry is off
possible on master exit
*/
#define SISL_AFU_RC_LXT_RW_PERM 0x15u /* no RW perms, user error */
#define SISL_AFU_RC_NOT_XLATE_HOST 0x1au /* possible if master exited */
/* NO_CHANNELS means the FC ports selected by dest_port in
* IOARCB or in the LXT entry are down when the AFU tried to select
* a FC port. If the port went down on an active IO, it will set
* fc_rc to =0x54(NOLOGI) or 0x57(LINKDOWN) instead.
*/
#define SISL_AFU_RC_NO_CHANNELS 0x20U /* see afu_extra, may retry */
#define SISL_AFU_RC_CAP_VIOLATION 0x21U /* either user error or
afu reset/master restart
*/
#define SISL_AFU_RC_OUT_OF_DATA_BUFS 0x30U /* always retry */
#define SISL_AFU_RC_DATA_DMA_ERR 0x31U /* see afu_extra
may retry if afu_retry is off
*/
u8 scsi_rc; /* SCSI status byte, retry as appropriate */
#define SISL_SCSI_RC_CHECK 0x02U
#define SISL_SCSI_RC_BUSY 0x08u
u8 fc_rc; /* retry */
/*
* We should only see fc_rc=0x57 (LINKDOWN) or 0x54(NOLOGI) for
* commands that are in flight when a link goes down or is logged out.
* If the link is down or logged out before AFU selects the port, either
* it will choose the other port or we will get afu_rc=0x20 (no_channel)
* if there is no valid port to use.
*
* ABORTPEND/ABORTOK/ABORTFAIL/TGTABORT can be retried, typically these
* would happen if a frame is dropped and something times out.
* NOLOGI or LINKDOWN can be retried if the other port is up.
* RESIDERR can be retried as well.
*
* ABORTFAIL might indicate that lots of frames are getting CRC errors.
* So it maybe retried once and reset the link if it happens again.
* The link can also be reset on the CRC error threshold interrupt.
*/
#define SISL_FC_RC_ABORTPEND 0x52 /* exchange timeout or abort request */
#define SISL_FC_RC_WRABORTPEND 0x53 /* due to write XFER_RDY invalid */
#define SISL_FC_RC_NOLOGI 0x54 /* port not logged in, in-flight cmds */
#define SISL_FC_RC_NOEXP 0x55 /* FC protocol error or HW bug */
#define SISL_FC_RC_INUSE 0x56 /* tag already in use, HW bug */
#define SISL_FC_RC_LINKDOWN 0x57 /* link down, in-flight cmds */
#define SISL_FC_RC_ABORTOK 0x58 /* pending abort completed w/success */
#define SISL_FC_RC_ABORTFAIL 0x59 /* pending abort completed w/fail */
#define SISL_FC_RC_RESID 0x5A /* ioasa underrun/overrun flags set */
#define SISL_FC_RC_RESIDERR 0x5B /* actual data len does not match SCSI
reported len, possibly due to dropped
frames */
#define SISL_FC_RC_TGTABORT 0x5C /* command aborted by target */
};
#define SISL_SENSE_DATA_LEN 20 /* Sense data length */
/*
* IOASA: 64 bytes & must follow IOARCB, min 16 byte alignment required,
* host native endianness
*/
struct sisl_ioasa {
union {
struct sisl_rc rc;
u32 ioasc;
#define SISL_IOASC_GOOD_COMPLETION 0x00000000U
};
u32 resid;
u8 port;
u8 afu_extra;
/* when afu_rc=0x04, 0x14, 0x31 (_xxx_DMA_ERR):
* afu_exta contains PSL response code. Useful codes are:
*/
#define SISL_AFU_DMA_ERR_PAGE_IN 0x0A /* AFU_retry_on_pagein Action
* Enabled N/A
* Disabled retry
*/
#define SISL_AFU_DMA_ERR_INVALID_EA 0x0B /* this is a hard error
* afu_rc Implies
* 0x04, 0x14 master exit.
* 0x31 user error.
*/
/* when afu rc=0x20 (no channels):
* afu_extra bits [4:5]: available portmask, [6:7]: requested portmask.
*/
#define SISL_AFU_NO_CLANNELS_AMASK(afu_extra) (((afu_extra) & 0x0C) >> 2)
#define SISL_AFU_NO_CLANNELS_RMASK(afu_extra) ((afu_extra) & 0x03)
u8 scsi_extra;
u8 fc_extra;
u8 sense_data[SISL_SENSE_DATA_LEN];
/* These fields are defined by the SISlite architecture for the
* host to use as they see fit for their implementation.
*/
union {
u64 host_use[4];
u8 host_use_b[32];
};
} __packed;
#define SISL_RESP_HANDLE_T_BIT 0x1ULL /* Toggle bit */
/* MMIO space is required to support only 64-bit access */
/*
* This AFU has two mechanisms to deal with endian-ness.
* One is a global configuration (in the afu_config) register
* below that specifies the endian-ness of the host.
* The other is a per context (i.e. application) specification
* controlled by the endian_ctrl field here. Since the master
* context is one such application the master context's
* endian-ness is set to be the same as the host.
*
* As per the SISlite spec, the MMIO registers are always
* big endian.
*/
#define SISL_ENDIAN_CTRL_BE 0x8000000000000080ULL
#define SISL_ENDIAN_CTRL_LE 0x0000000000000000ULL
#ifdef __BIG_ENDIAN
#define SISL_ENDIAN_CTRL SISL_ENDIAN_CTRL_BE
#else
#define SISL_ENDIAN_CTRL SISL_ENDIAN_CTRL_LE
#endif
/* per context host transport MMIO */
struct sisl_host_map {
__be64 endian_ctrl; /* Per context Endian Control. The AFU will
* operate on whatever the context is of the
* host application.
*/
__be64 intr_status; /* this sends LISN# programmed in ctx_ctrl.
* Only recovery in a PERM_ERR is a context
* exit since there is no way to tell which
* command caused the error.
*/
#define SISL_ISTATUS_PERM_ERR_CMDROOM 0x0010ULL /* b59, user error */
#define SISL_ISTATUS_PERM_ERR_RCB_READ 0x0008ULL /* b60, user error */
#define SISL_ISTATUS_PERM_ERR_SA_WRITE 0x0004ULL /* b61, user error */
#define SISL_ISTATUS_PERM_ERR_RRQ_WRITE 0x0002ULL /* b62, user error */
/* Page in wait accessing RCB/IOASA/RRQ is reported in b63.
* Same error in data/LXT/RHT access is reported via IOASA.
*/
#define SISL_ISTATUS_TEMP_ERR_PAGEIN 0x0001ULL /* b63, can be generated
* only when AFU auto
* retry is disabled.
* If user can determine
* the command that
* caused the error, it
* can be retried.
*/
#define SISL_ISTATUS_UNMASK (0x001FULL) /* 1 means unmasked */
#define SISL_ISTATUS_MASK ~(SISL_ISTATUS_UNMASK) /* 1 means masked */
__be64 intr_clear;
__be64 intr_mask;
__be64 ioarrin; /* only write what cmd_room permits */
__be64 rrq_start; /* start & end are both inclusive */
__be64 rrq_end; /* write sequence: start followed by end */
__be64 cmd_room;
__be64 ctx_ctrl; /* least significant byte or b56:63 is LISN# */
__be64 mbox_w; /* restricted use */
__be64 sq_start; /* Submission Queue (R/W): write sequence and */
__be64 sq_end; /* inclusion semantics are the same as RRQ */
__be64 sq_head; /* Submission Queue Head (R): for debugging */
__be64 sq_tail; /* Submission Queue TAIL (R/W): next IOARCB */
__be64 sq_ctx_reset; /* Submission Queue Context Reset (R/W) */
};
/* per context provisioning & control MMIO */
struct sisl_ctrl_map {
__be64 rht_start;
__be64 rht_cnt_id;
/* both cnt & ctx_id args must be ULL */
#define SISL_RHT_CNT_ID(cnt, ctx_id) (((cnt) << 48) | ((ctx_id) << 32))
__be64 ctx_cap; /* afu_rc below is when the capability is violated */
#define SISL_CTX_CAP_PROXY_ISSUE 0x8000000000000000ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_REAL_MODE 0x4000000000000000ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_HOST_XLATE 0x2000000000000000ULL /* afu_rc 0x1a */
#define SISL_CTX_CAP_PROXY_TARGET 0x1000000000000000ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_AFU_CMD 0x0000000000000008ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_GSCSI_CMD 0x0000000000000004ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_WRITE_CMD 0x0000000000000002ULL /* afu_rc 0x21 */
#define SISL_CTX_CAP_READ_CMD 0x0000000000000001ULL /* afu_rc 0x21 */
__be64 mbox_r;
};
/* single copy global regs */
struct sisl_global_regs {
__be64 aintr_status;
/* In cxlflash, each FC port/link gets a byte of status */
#define SISL_ASTATUS_FC0_OTHER 0x8000ULL /* b48, other err,
FC_ERRCAP[31:20] */
#define SISL_ASTATUS_FC0_LOGO 0x4000ULL /* b49, target sent FLOGI/PLOGI/LOGO
while logged in */
#define SISL_ASTATUS_FC0_CRC_T 0x2000ULL /* b50, CRC threshold exceeded */
#define SISL_ASTATUS_FC0_LOGI_R 0x1000ULL /* b51, login state machine timed out
and retrying */
#define SISL_ASTATUS_FC0_LOGI_F 0x0800ULL /* b52, login failed,
FC_ERROR[19:0] */
#define SISL_ASTATUS_FC0_LOGI_S 0x0400ULL /* b53, login succeeded */
#define SISL_ASTATUS_FC0_LINK_DN 0x0200ULL /* b54, link online to offline */
#define SISL_ASTATUS_FC0_LINK_UP 0x0100ULL /* b55, link offline to online */
#define SISL_ASTATUS_FC1_OTHER 0x0080ULL /* b56 */
#define SISL_ASTATUS_FC1_LOGO 0x0040ULL /* b57 */
#define SISL_ASTATUS_FC1_CRC_T 0x0020ULL /* b58 */
#define SISL_ASTATUS_FC1_LOGI_R 0x0010ULL /* b59 */
#define SISL_ASTATUS_FC1_LOGI_F 0x0008ULL /* b60 */
#define SISL_ASTATUS_FC1_LOGI_S 0x0004ULL /* b61 */
#define SISL_ASTATUS_FC1_LINK_DN 0x0002ULL /* b62 */
#define SISL_ASTATUS_FC1_LINK_UP 0x0001ULL /* b63 */
#define SISL_FC_INTERNAL_UNMASK 0x0000000300000000ULL /* 1 means unmasked */
#define SISL_FC_INTERNAL_MASK ~(SISL_FC_INTERNAL_UNMASK)
#define SISL_FC_INTERNAL_SHIFT 32
#define SISL_FC_SHUTDOWN_NORMAL 0x0000000000000010ULL
#define SISL_FC_SHUTDOWN_ABRUPT 0x0000000000000020ULL
#define SISL_STATUS_SHUTDOWN_ACTIVE 0x0000000000000010ULL
#define SISL_STATUS_SHUTDOWN_COMPLETE 0x0000000000000020ULL
#define SISL_ASTATUS_UNMASK 0xFFFFULL /* 1 means unmasked */
#define SISL_ASTATUS_MASK ~(SISL_ASTATUS_UNMASK) /* 1 means masked */
__be64 aintr_clear;
__be64 aintr_mask;
__be64 afu_ctrl;
__be64 afu_hb;
__be64 afu_scratch_pad;
__be64 afu_port_sel;
#define SISL_AFUCONF_AR_IOARCB 0x4000ULL
#define SISL_AFUCONF_AR_LXT 0x2000ULL
#define SISL_AFUCONF_AR_RHT 0x1000ULL
#define SISL_AFUCONF_AR_DATA 0x0800ULL
#define SISL_AFUCONF_AR_RSRC 0x0400ULL
#define SISL_AFUCONF_AR_IOASA 0x0200ULL
#define SISL_AFUCONF_AR_RRQ 0x0100ULL
/* Aggregate all Auto Retry Bits */
#define SISL_AFUCONF_AR_ALL (SISL_AFUCONF_AR_IOARCB|SISL_AFUCONF_AR_LXT| \
SISL_AFUCONF_AR_RHT|SISL_AFUCONF_AR_DATA| \
SISL_AFUCONF_AR_RSRC|SISL_AFUCONF_AR_IOASA| \
SISL_AFUCONF_AR_RRQ)
#ifdef __BIG_ENDIAN
#define SISL_AFUCONF_ENDIAN 0x0000ULL
#else
#define SISL_AFUCONF_ENDIAN 0x0020ULL
#endif
#define SISL_AFUCONF_MBOX_CLR_READ 0x0010ULL
__be64 afu_config;
__be64 rsvd[0xf8];
__le64 afu_version;
__be64 interface_version;
#define SISL_INTVER_CAP_SHIFT 16
#define SISL_INTVER_MAJ_SHIFT 8
#define SISL_INTVER_CAP_MASK 0xFFFFFFFF00000000ULL
#define SISL_INTVER_MAJ_MASK 0x00000000FFFF0000ULL
#define SISL_INTVER_MIN_MASK 0x000000000000FFFFULL
#define SISL_INTVER_CAP_IOARRIN_CMD_MODE 0x800000000000ULL
#define SISL_INTVER_CAP_SQ_CMD_MODE 0x400000000000ULL
#define SISL_INTVER_CAP_RESERVED_CMD_MODE_A 0x200000000000ULL
#define SISL_INTVER_CAP_RESERVED_CMD_MODE_B 0x100000000000ULL
};
#define CXLFLASH_NUM_FC_PORTS 2
#define CXLFLASH_MAX_CONTEXT 512 /* how many contexts per afu */
#define CXLFLASH_NUM_VLUNS 512
struct sisl_global_map {
union {
struct sisl_global_regs regs;
char page0[SIZE_4K]; /* page 0 */
};
char page1[SIZE_4K]; /* page 1 */
/* pages 2 & 3 */
__be64 fc_regs[CXLFLASH_NUM_FC_PORTS][CXLFLASH_NUM_VLUNS];
/* pages 4 & 5 (lun tbl) */
__be64 fc_port[CXLFLASH_NUM_FC_PORTS][CXLFLASH_NUM_VLUNS];
};
/*
* CXL Flash Memory Map
*
* +-------------------------------+
* | 512 * 64 KB User MMIO |
* | (per context) |
* | User Accessible |
* +-------------------------------+
* | 512 * 128 B per context |
* | Provisioning and Control |
* | Trusted Process accessible |
* +-------------------------------+
* | 64 KB Global |
* | Trusted Process accessible |
* +-------------------------------+
*/
struct cxlflash_afu_map {
union {
struct sisl_host_map host;
char harea[SIZE_64K]; /* 64KB each */
} hosts[CXLFLASH_MAX_CONTEXT];
union {
struct sisl_ctrl_map ctrl;
char carea[cache_line_size()]; /* 128B each */
} ctrls[CXLFLASH_MAX_CONTEXT];
union {
struct sisl_global_map global;
char garea[SIZE_64K]; /* 64KB single block */
};
};
/*
* LXT - LBA Translation Table
* LXT control blocks
*/
struct sisl_lxt_entry {
u64 rlba_base; /* bits 0:47 is base
* b48:55 is lun index
* b58:59 is write & read perms
* (if no perm, afu_rc=0x15)
* b60:63 is port_sel mask
*/
};
/*
* RHT - Resource Handle Table
* Per the SISlite spec, RHT entries are to be 16-byte aligned
*/
struct sisl_rht_entry {
struct sisl_lxt_entry *lxt_start;
u32 lxt_cnt;
u16 rsvd;
u8 fp; /* format & perm nibbles.
* (if no perm, afu_rc=0x05)
*/
u8 nmask;
} __packed __aligned(16);
struct sisl_rht_entry_f1 {
u64 lun_id;
union {
struct {
u8 valid;
u8 rsvd[5];
u8 fp;
u8 port_sel;
};
u64 dw;
};
} __packed __aligned(16);
/* make the fp byte */
#define SISL_RHT_FP(fmt, perm) (((fmt) << 4) | (perm))
/* make the fp byte for a clone from a source fp and clone flags
* flags must be only 2 LSB bits.
*/
#define SISL_RHT_FP_CLONE(src_fp, cln_flags) ((src_fp) & (0xFC | (cln_flags)))
#define RHT_PERM_READ 0x01U
#define RHT_PERM_WRITE 0x02U
#define RHT_PERM_RW (RHT_PERM_READ | RHT_PERM_WRITE)
/* extract the perm bits from a fp */
#define SISL_RHT_PERM(fp) ((fp) & RHT_PERM_RW)
#define PORT0 0x01U
#define PORT1 0x02U
#define BOTH_PORTS (PORT0 | PORT1)
/* AFU Sync Mode byte */
#define AFU_LW_SYNC 0x0U
#define AFU_HW_SYNC 0x1U
#define AFU_GSYNC 0x2U
/* Special Task Management Function CDB */
#define TMF_LUN_RESET 0x1U
#define TMF_CLEAR_ACA 0x2U
#define SISLITE_MAX_WS_BLOCKS 512
#endif /* _SISLITE_H */
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