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