--- /dev/null
+/*
+ * 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 */
+ struct scsi_cmnd *scp;
+} __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 */
+};
+
+/* 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_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 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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