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cd41e18daf
Validation statements to enforce assumptions about specific defines are not being evaluated by the compiler due to the fact that they reside in a routine that is not used. To activate them, call the routine as part of module initialization. As an additional, related cleanup, remove the now-defunct CXLFLASH_NUM_CMDS. 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>
2869 lines
79 KiB
C
2869 lines
79 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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#include <linux/delay.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <asm/unaligned.h>
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#include <misc/cxl.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
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#include <uapi/scsi/cxlflash_ioctl.h>
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#include "main.h"
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#include "sislite.h"
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#include "common.h"
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MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME);
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MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>");
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MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>");
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MODULE_LICENSE("GPL");
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/**
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* process_cmd_err() - command error handler
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* @cmd: AFU command that experienced the error.
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* @scp: SCSI command associated with the AFU command in error.
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*
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* Translates error bits from AFU command to SCSI command results.
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*/
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static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
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{
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struct afu *afu = cmd->parent;
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struct cxlflash_cfg *cfg = afu->parent;
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struct device *dev = &cfg->dev->dev;
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struct sisl_ioarcb *ioarcb;
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struct sisl_ioasa *ioasa;
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u32 resid;
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if (unlikely(!cmd))
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return;
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ioarcb = &(cmd->rcb);
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ioasa = &(cmd->sa);
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if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) {
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resid = ioasa->resid;
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scsi_set_resid(scp, resid);
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dev_dbg(dev, "%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
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__func__, cmd, scp, resid);
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}
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if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) {
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dev_dbg(dev, "%s: cmd underrun cmd = %p scp = %p\n",
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__func__, cmd, scp);
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scp->result = (DID_ERROR << 16);
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}
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dev_dbg(dev, "%s: cmd failed afu_rc=%02x scsi_rc=%02x fc_rc=%02x "
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"afu_extra=%02x scsi_extra=%02x fc_extra=%02x\n", __func__,
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ioasa->rc.afu_rc, ioasa->rc.scsi_rc, ioasa->rc.fc_rc,
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ioasa->afu_extra, ioasa->scsi_extra, ioasa->fc_extra);
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if (ioasa->rc.scsi_rc) {
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/* We have a SCSI status */
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if (ioasa->rc.flags & SISL_RC_FLAGS_SENSE_VALID) {
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memcpy(scp->sense_buffer, ioasa->sense_data,
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SISL_SENSE_DATA_LEN);
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scp->result = ioasa->rc.scsi_rc;
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} else
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scp->result = ioasa->rc.scsi_rc | (DID_ERROR << 16);
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}
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/*
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* We encountered an error. Set scp->result based on nature
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* of error.
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*/
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if (ioasa->rc.fc_rc) {
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/* We have an FC status */
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switch (ioasa->rc.fc_rc) {
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case SISL_FC_RC_LINKDOWN:
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scp->result = (DID_REQUEUE << 16);
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break;
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case SISL_FC_RC_RESID:
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/* This indicates an FCP resid underrun */
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if (!(ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN)) {
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/* If the SISL_RC_FLAGS_OVERRUN flag was set,
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* then we will handle this error else where.
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* If not then we must handle it here.
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* This is probably an AFU bug.
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*/
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scp->result = (DID_ERROR << 16);
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}
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break;
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case SISL_FC_RC_RESIDERR:
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/* Resid mismatch between adapter and device */
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case SISL_FC_RC_TGTABORT:
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case SISL_FC_RC_ABORTOK:
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case SISL_FC_RC_ABORTFAIL:
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case SISL_FC_RC_NOLOGI:
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case SISL_FC_RC_ABORTPEND:
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case SISL_FC_RC_WRABORTPEND:
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case SISL_FC_RC_NOEXP:
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case SISL_FC_RC_INUSE:
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scp->result = (DID_ERROR << 16);
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break;
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}
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}
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if (ioasa->rc.afu_rc) {
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/* We have an AFU error */
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switch (ioasa->rc.afu_rc) {
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case SISL_AFU_RC_NO_CHANNELS:
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scp->result = (DID_NO_CONNECT << 16);
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break;
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case SISL_AFU_RC_DATA_DMA_ERR:
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switch (ioasa->afu_extra) {
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case SISL_AFU_DMA_ERR_PAGE_IN:
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/* Retry */
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scp->result = (DID_IMM_RETRY << 16);
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break;
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case SISL_AFU_DMA_ERR_INVALID_EA:
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default:
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scp->result = (DID_ERROR << 16);
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}
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break;
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case SISL_AFU_RC_OUT_OF_DATA_BUFS:
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/* Retry */
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scp->result = (DID_ALLOC_FAILURE << 16);
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break;
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default:
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scp->result = (DID_ERROR << 16);
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}
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}
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}
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/**
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* cmd_complete() - command completion handler
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* @cmd: AFU command that has completed.
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*
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* Prepares and submits command that has either completed or timed out to
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* the SCSI stack. Checks AFU command back into command pool for non-internal
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* (cmd->scp populated) commands.
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*/
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static void cmd_complete(struct afu_cmd *cmd)
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{
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struct scsi_cmnd *scp;
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ulong lock_flags;
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struct afu *afu = cmd->parent;
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struct cxlflash_cfg *cfg = afu->parent;
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struct device *dev = &cfg->dev->dev;
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bool cmd_is_tmf;
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if (cmd->scp) {
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scp = cmd->scp;
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if (unlikely(cmd->sa.ioasc))
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process_cmd_err(cmd, scp);
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else
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scp->result = (DID_OK << 16);
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cmd_is_tmf = cmd->cmd_tmf;
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dev_dbg_ratelimited(dev, "%s:scp=%p result=%08x ioasc=%08x\n",
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__func__, scp, scp->result, cmd->sa.ioasc);
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scp->scsi_done(scp);
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if (cmd_is_tmf) {
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spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
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cfg->tmf_active = false;
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wake_up_all_locked(&cfg->tmf_waitq);
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spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
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}
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} else
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complete(&cmd->cevent);
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}
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/**
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* context_reset() - reset command owner context via specified register
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* @cmd: AFU command that timed out.
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* @reset_reg: MMIO register to perform reset.
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*/
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static void context_reset(struct afu_cmd *cmd, __be64 __iomem *reset_reg)
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{
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int nretry = 0;
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u64 rrin = 0x1;
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struct afu *afu = cmd->parent;
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struct cxlflash_cfg *cfg = afu->parent;
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struct device *dev = &cfg->dev->dev;
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dev_dbg(dev, "%s: cmd=%p\n", __func__, cmd);
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writeq_be(rrin, reset_reg);
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do {
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rrin = readq_be(reset_reg);
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if (rrin != 0x1)
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break;
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/* Double delay each time */
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udelay(1 << nretry);
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} while (nretry++ < MC_ROOM_RETRY_CNT);
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dev_dbg(dev, "%s: returning rrin=%016llx nretry=%d\n",
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__func__, rrin, nretry);
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}
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/**
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* context_reset_ioarrin() - reset command owner context via IOARRIN register
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* @cmd: AFU command that timed out.
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*/
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static void context_reset_ioarrin(struct afu_cmd *cmd)
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{
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struct afu *afu = cmd->parent;
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context_reset(cmd, &afu->host_map->ioarrin);
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}
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/**
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* context_reset_sq() - reset command owner context w/ SQ Context Reset register
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* @cmd: AFU command that timed out.
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*/
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static void context_reset_sq(struct afu_cmd *cmd)
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{
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struct afu *afu = cmd->parent;
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context_reset(cmd, &afu->host_map->sq_ctx_reset);
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}
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/**
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* send_cmd_ioarrin() - sends an AFU command via IOARRIN register
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* @afu: AFU associated with the host.
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* @cmd: AFU command to send.
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*
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* Return:
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* 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
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*/
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static int send_cmd_ioarrin(struct afu *afu, struct afu_cmd *cmd)
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{
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struct cxlflash_cfg *cfg = afu->parent;
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struct device *dev = &cfg->dev->dev;
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int rc = 0;
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s64 room;
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ulong lock_flags;
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/*
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* To avoid the performance penalty of MMIO, spread the update of
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* 'room' over multiple commands.
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*/
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spin_lock_irqsave(&afu->rrin_slock, lock_flags);
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if (--afu->room < 0) {
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room = readq_be(&afu->host_map->cmd_room);
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if (room <= 0) {
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dev_dbg_ratelimited(dev, "%s: no cmd_room to send "
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"0x%02X, room=0x%016llX\n",
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__func__, cmd->rcb.cdb[0], room);
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afu->room = 0;
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rc = SCSI_MLQUEUE_HOST_BUSY;
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goto out;
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}
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afu->room = room - 1;
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}
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writeq_be((u64)&cmd->rcb, &afu->host_map->ioarrin);
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out:
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spin_unlock_irqrestore(&afu->rrin_slock, lock_flags);
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dev_dbg(dev, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__,
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cmd, cmd->rcb.data_len, cmd->rcb.data_ea, rc);
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return rc;
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}
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/**
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* send_cmd_sq() - sends an AFU command via SQ ring
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* @afu: AFU associated with the host.
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* @cmd: AFU command to send.
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*
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* Return:
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* 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
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*/
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static int send_cmd_sq(struct afu *afu, struct afu_cmd *cmd)
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{
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struct cxlflash_cfg *cfg = afu->parent;
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struct device *dev = &cfg->dev->dev;
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int rc = 0;
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int newval;
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ulong lock_flags;
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newval = atomic_dec_if_positive(&afu->hsq_credits);
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if (newval <= 0) {
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rc = SCSI_MLQUEUE_HOST_BUSY;
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goto out;
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}
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cmd->rcb.ioasa = &cmd->sa;
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spin_lock_irqsave(&afu->hsq_slock, lock_flags);
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*afu->hsq_curr = cmd->rcb;
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if (afu->hsq_curr < afu->hsq_end)
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afu->hsq_curr++;
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else
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afu->hsq_curr = afu->hsq_start;
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writeq_be((u64)afu->hsq_curr, &afu->host_map->sq_tail);
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spin_unlock_irqrestore(&afu->hsq_slock, lock_flags);
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out:
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dev_dbg(dev, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p "
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"head=%016llx tail=%016llx\n", __func__, cmd, cmd->rcb.data_len,
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cmd->rcb.data_ea, cmd->rcb.ioasa, rc, afu->hsq_curr,
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readq_be(&afu->host_map->sq_head),
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readq_be(&afu->host_map->sq_tail));
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return rc;
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}
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/**
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* wait_resp() - polls for a response or timeout to a sent AFU command
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* @afu: AFU associated with the host.
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* @cmd: AFU command that was sent.
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*
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* Return:
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* 0 on success, -1 on timeout/error
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*/
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static int wait_resp(struct afu *afu, struct afu_cmd *cmd)
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{
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struct cxlflash_cfg *cfg = afu->parent;
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struct device *dev = &cfg->dev->dev;
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int rc = 0;
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ulong timeout = msecs_to_jiffies(cmd->rcb.timeout * 2 * 1000);
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timeout = wait_for_completion_timeout(&cmd->cevent, timeout);
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if (!timeout) {
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afu->context_reset(cmd);
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rc = -1;
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}
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if (unlikely(cmd->sa.ioasc != 0)) {
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dev_err(dev, "%s: cmd %02x failed, ioasc=%08x\n",
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__func__, cmd->rcb.cdb[0], cmd->sa.ioasc);
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rc = -1;
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}
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return rc;
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}
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/**
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* send_tmf() - sends a Task Management Function (TMF)
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* @afu: AFU to checkout from.
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* @scp: SCSI command from stack.
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* @tmfcmd: TMF command to send.
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*
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* Return:
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* 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
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*/
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static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd)
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{
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struct cxlflash_cfg *cfg = shost_priv(scp->device->host);
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struct afu_cmd *cmd = sc_to_afucz(scp);
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struct device *dev = &cfg->dev->dev;
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ulong lock_flags;
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int rc = 0;
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ulong to;
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/* When Task Management Function is active do not send another */
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spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
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if (cfg->tmf_active)
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wait_event_interruptible_lock_irq(cfg->tmf_waitq,
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!cfg->tmf_active,
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cfg->tmf_slock);
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cfg->tmf_active = true;
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spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
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cmd->scp = scp;
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cmd->parent = afu;
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cmd->cmd_tmf = true;
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cmd->rcb.ctx_id = afu->ctx_hndl;
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cmd->rcb.msi = SISL_MSI_RRQ_UPDATED;
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cmd->rcb.port_sel = CHAN2PORTMASK(scp->device->channel);
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cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
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cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID |
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SISL_REQ_FLAGS_SUP_UNDERRUN |
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SISL_REQ_FLAGS_TMF_CMD);
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memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd));
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rc = afu->send_cmd(afu, cmd);
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if (unlikely(rc)) {
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spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
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cfg->tmf_active = false;
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spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
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goto out;
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}
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spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
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to = msecs_to_jiffies(5000);
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to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq,
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!cfg->tmf_active,
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cfg->tmf_slock,
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to);
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if (!to) {
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cfg->tmf_active = false;
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dev_err(dev, "%s: TMF timed out\n", __func__);
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rc = -1;
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}
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spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
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out:
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return rc;
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}
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|
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/**
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* cxlflash_driver_info() - information handler for this host driver
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* @host: SCSI host associated with device.
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*
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* Return: A string describing the device.
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*/
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static const char *cxlflash_driver_info(struct Scsi_Host *host)
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{
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return CXLFLASH_ADAPTER_NAME;
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}
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|
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/**
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* cxlflash_queuecommand() - sends a mid-layer request
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* @host: SCSI host associated with device.
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* @scp: SCSI command to send.
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*
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* Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
|
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*/
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static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
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{
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struct cxlflash_cfg *cfg = shost_priv(host);
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struct afu *afu = cfg->afu;
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struct device *dev = &cfg->dev->dev;
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struct afu_cmd *cmd = sc_to_afucz(scp);
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struct scatterlist *sg = scsi_sglist(scp);
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u16 req_flags = SISL_REQ_FLAGS_SUP_UNDERRUN;
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ulong lock_flags;
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int rc = 0;
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dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu "
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"cdb=(%08x-%08x-%08x-%08x)\n",
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__func__, scp, host->host_no, scp->device->channel,
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scp->device->id, scp->device->lun,
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get_unaligned_be32(&((u32 *)scp->cmnd)[0]),
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get_unaligned_be32(&((u32 *)scp->cmnd)[1]),
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get_unaligned_be32(&((u32 *)scp->cmnd)[2]),
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get_unaligned_be32(&((u32 *)scp->cmnd)[3]));
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|
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/*
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* If a Task Management Function is active, wait for it to complete
|
|
* before continuing with regular commands.
|
|
*/
|
|
spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
|
|
if (cfg->tmf_active) {
|
|
spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
goto out;
|
|
}
|
|
spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
|
|
|
|
switch (cfg->state) {
|
|
case STATE_PROBING:
|
|
case STATE_PROBED:
|
|
case STATE_RESET:
|
|
dev_dbg_ratelimited(dev, "%s: device is in reset\n", __func__);
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
goto out;
|
|
case STATE_FAILTERM:
|
|
dev_dbg_ratelimited(dev, "%s: device has failed\n", __func__);
|
|
scp->result = (DID_NO_CONNECT << 16);
|
|
scp->scsi_done(scp);
|
|
rc = 0;
|
|
goto out;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (likely(sg)) {
|
|
cmd->rcb.data_len = sg->length;
|
|
cmd->rcb.data_ea = (uintptr_t)sg_virt(sg);
|
|
}
|
|
|
|
cmd->scp = scp;
|
|
cmd->parent = afu;
|
|
|
|
cmd->rcb.ctx_id = afu->ctx_hndl;
|
|
cmd->rcb.msi = SISL_MSI_RRQ_UPDATED;
|
|
cmd->rcb.port_sel = CHAN2PORTMASK(scp->device->channel);
|
|
cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
|
|
|
|
if (scp->sc_data_direction == DMA_TO_DEVICE)
|
|
req_flags |= SISL_REQ_FLAGS_HOST_WRITE;
|
|
|
|
cmd->rcb.req_flags = req_flags;
|
|
memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb));
|
|
|
|
rc = afu->send_cmd(afu, cmd);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
|
|
* @cfg: Internal structure associated with the host.
|
|
*/
|
|
static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct pci_dev *pdev = cfg->dev;
|
|
|
|
if (pci_channel_offline(pdev))
|
|
wait_event_timeout(cfg->reset_waitq,
|
|
!pci_channel_offline(pdev),
|
|
CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT);
|
|
}
|
|
|
|
/**
|
|
* free_mem() - free memory associated with the AFU
|
|
* @cfg: Internal structure associated with the host.
|
|
*/
|
|
static void free_mem(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
|
|
if (cfg->afu) {
|
|
free_pages((ulong)afu, get_order(sizeof(struct afu)));
|
|
cfg->afu = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* stop_afu() - stops the AFU command timers and unmaps the MMIO space
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Safe to call with AFU in a partially allocated/initialized state.
|
|
*
|
|
* Cancels scheduled worker threads, waits for any active internal AFU
|
|
* commands to timeout, disables IRQ polling and then unmaps the MMIO space.
|
|
*/
|
|
static void stop_afu(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
|
|
cancel_work_sync(&cfg->work_q);
|
|
|
|
if (likely(afu)) {
|
|
while (atomic_read(&afu->cmds_active))
|
|
ssleep(1);
|
|
if (afu_is_irqpoll_enabled(afu))
|
|
irq_poll_disable(&afu->irqpoll);
|
|
if (likely(afu->afu_map)) {
|
|
cxl_psa_unmap((void __iomem *)afu->afu_map);
|
|
afu->afu_map = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* term_intr() - disables all AFU interrupts
|
|
* @cfg: Internal structure associated with the host.
|
|
* @level: Depth of allocation, where to begin waterfall tear down.
|
|
*
|
|
* Safe to call with AFU/MC in partially allocated/initialized state.
|
|
*/
|
|
static void term_intr(struct cxlflash_cfg *cfg, enum undo_level level)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
if (!afu || !cfg->mcctx) {
|
|
dev_err(dev, "%s: returning with NULL afu or MC\n", __func__);
|
|
return;
|
|
}
|
|
|
|
switch (level) {
|
|
case UNMAP_THREE:
|
|
cxl_unmap_afu_irq(cfg->mcctx, 3, afu);
|
|
case UNMAP_TWO:
|
|
cxl_unmap_afu_irq(cfg->mcctx, 2, afu);
|
|
case UNMAP_ONE:
|
|
cxl_unmap_afu_irq(cfg->mcctx, 1, afu);
|
|
case FREE_IRQ:
|
|
cxl_free_afu_irqs(cfg->mcctx);
|
|
/* fall through */
|
|
case UNDO_NOOP:
|
|
/* No action required */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* term_mc() - terminates the master context
|
|
* @cfg: Internal structure associated with the host.
|
|
* @level: Depth of allocation, where to begin waterfall tear down.
|
|
*
|
|
* Safe to call with AFU/MC in partially allocated/initialized state.
|
|
*/
|
|
static void term_mc(struct cxlflash_cfg *cfg)
|
|
{
|
|
int rc = 0;
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
if (!afu || !cfg->mcctx) {
|
|
dev_err(dev, "%s: returning with NULL afu or MC\n", __func__);
|
|
return;
|
|
}
|
|
|
|
rc = cxl_stop_context(cfg->mcctx);
|
|
WARN_ON(rc);
|
|
cfg->mcctx = NULL;
|
|
}
|
|
|
|
/**
|
|
* term_afu() - terminates the AFU
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Safe to call with AFU/MC in partially allocated/initialized state.
|
|
*/
|
|
static void term_afu(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
/*
|
|
* Tear down is carefully orchestrated to ensure
|
|
* no interrupts can come in when the problem state
|
|
* area is unmapped.
|
|
*
|
|
* 1) Disable all AFU interrupts
|
|
* 2) Unmap the problem state area
|
|
* 3) Stop the master context
|
|
*/
|
|
term_intr(cfg, UNMAP_THREE);
|
|
if (cfg->afu)
|
|
stop_afu(cfg);
|
|
|
|
term_mc(cfg);
|
|
|
|
dev_dbg(dev, "%s: returning\n", __func__);
|
|
}
|
|
|
|
/**
|
|
* notify_shutdown() - notifies device of pending shutdown
|
|
* @cfg: Internal structure associated with the host.
|
|
* @wait: Whether to wait for shutdown processing to complete.
|
|
*
|
|
* This function will notify the AFU that the adapter is being shutdown
|
|
* and will wait for shutdown processing to complete if wait is true.
|
|
* This notification should flush pending I/Os to the device and halt
|
|
* further I/Os until the next AFU reset is issued and device restarted.
|
|
*/
|
|
static void notify_shutdown(struct cxlflash_cfg *cfg, bool wait)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
struct dev_dependent_vals *ddv;
|
|
__be64 __iomem *fc_port_regs;
|
|
u64 reg, status;
|
|
int i, retry_cnt = 0;
|
|
|
|
ddv = (struct dev_dependent_vals *)cfg->dev_id->driver_data;
|
|
if (!(ddv->flags & CXLFLASH_NOTIFY_SHUTDOWN))
|
|
return;
|
|
|
|
if (!afu || !afu->afu_map) {
|
|
dev_dbg(dev, "%s: Problem state area not mapped\n", __func__);
|
|
return;
|
|
}
|
|
|
|
/* Notify AFU */
|
|
for (i = 0; i < cfg->num_fc_ports; i++) {
|
|
fc_port_regs = get_fc_port_regs(cfg, i);
|
|
|
|
reg = readq_be(&fc_port_regs[FC_CONFIG2 / 8]);
|
|
reg |= SISL_FC_SHUTDOWN_NORMAL;
|
|
writeq_be(reg, &fc_port_regs[FC_CONFIG2 / 8]);
|
|
}
|
|
|
|
if (!wait)
|
|
return;
|
|
|
|
/* Wait up to 1.5 seconds for shutdown processing to complete */
|
|
for (i = 0; i < cfg->num_fc_ports; i++) {
|
|
fc_port_regs = get_fc_port_regs(cfg, i);
|
|
retry_cnt = 0;
|
|
|
|
while (true) {
|
|
status = readq_be(&fc_port_regs[FC_STATUS / 8]);
|
|
if (status & SISL_STATUS_SHUTDOWN_COMPLETE)
|
|
break;
|
|
if (++retry_cnt >= MC_RETRY_CNT) {
|
|
dev_dbg(dev, "%s: port %d shutdown processing "
|
|
"not yet completed\n", __func__, i);
|
|
break;
|
|
}
|
|
msleep(100 * retry_cnt);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* cxlflash_remove() - PCI entry point to tear down host
|
|
* @pdev: PCI device associated with the host.
|
|
*
|
|
* Safe to use as a cleanup in partially allocated/initialized state. Note that
|
|
* the reset_waitq is flushed as part of the stop/termination of user contexts.
|
|
*/
|
|
static void cxlflash_remove(struct pci_dev *pdev)
|
|
{
|
|
struct cxlflash_cfg *cfg = pci_get_drvdata(pdev);
|
|
struct device *dev = &pdev->dev;
|
|
ulong lock_flags;
|
|
|
|
if (!pci_is_enabled(pdev)) {
|
|
dev_dbg(dev, "%s: Device is disabled\n", __func__);
|
|
return;
|
|
}
|
|
|
|
/* If a Task Management Function is active, wait for it to complete
|
|
* before continuing with remove.
|
|
*/
|
|
spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
|
|
if (cfg->tmf_active)
|
|
wait_event_interruptible_lock_irq(cfg->tmf_waitq,
|
|
!cfg->tmf_active,
|
|
cfg->tmf_slock);
|
|
spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
|
|
|
|
/* Notify AFU and wait for shutdown processing to complete */
|
|
notify_shutdown(cfg, true);
|
|
|
|
cfg->state = STATE_FAILTERM;
|
|
cxlflash_stop_term_user_contexts(cfg);
|
|
|
|
switch (cfg->init_state) {
|
|
case INIT_STATE_SCSI:
|
|
cxlflash_term_local_luns(cfg);
|
|
scsi_remove_host(cfg->host);
|
|
case INIT_STATE_AFU:
|
|
term_afu(cfg);
|
|
case INIT_STATE_PCI:
|
|
pci_disable_device(pdev);
|
|
case INIT_STATE_NONE:
|
|
free_mem(cfg);
|
|
scsi_host_put(cfg->host);
|
|
break;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: returning\n", __func__);
|
|
}
|
|
|
|
/**
|
|
* alloc_mem() - allocates the AFU and its command pool
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* A partially allocated state remains on failure.
|
|
*
|
|
* Return:
|
|
* 0 on success
|
|
* -ENOMEM on failure to allocate memory
|
|
*/
|
|
static int alloc_mem(struct cxlflash_cfg *cfg)
|
|
{
|
|
int rc = 0;
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
/* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */
|
|
cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
|
get_order(sizeof(struct afu)));
|
|
if (unlikely(!cfg->afu)) {
|
|
dev_err(dev, "%s: cannot get %d free pages\n",
|
|
__func__, get_order(sizeof(struct afu)));
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
cfg->afu->parent = cfg;
|
|
cfg->afu->afu_map = NULL;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* init_pci() - initializes the host as a PCI device
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int init_pci(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct pci_dev *pdev = cfg->dev;
|
|
struct device *dev = &cfg->dev->dev;
|
|
int rc = 0;
|
|
|
|
rc = pci_enable_device(pdev);
|
|
if (rc || pci_channel_offline(pdev)) {
|
|
if (pci_channel_offline(pdev)) {
|
|
cxlflash_wait_for_pci_err_recovery(cfg);
|
|
rc = pci_enable_device(pdev);
|
|
}
|
|
|
|
if (rc) {
|
|
dev_err(dev, "%s: Cannot enable adapter\n", __func__);
|
|
cxlflash_wait_for_pci_err_recovery(cfg);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* init_scsi() - adds the host to the SCSI stack and kicks off host scan
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int init_scsi(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct pci_dev *pdev = cfg->dev;
|
|
struct device *dev = &cfg->dev->dev;
|
|
int rc = 0;
|
|
|
|
rc = scsi_add_host(cfg->host, &pdev->dev);
|
|
if (rc) {
|
|
dev_err(dev, "%s: scsi_add_host failed rc=%d\n", __func__, rc);
|
|
goto out;
|
|
}
|
|
|
|
scsi_scan_host(cfg->host);
|
|
|
|
out:
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* set_port_online() - transitions the specified host FC port to online state
|
|
* @fc_regs: Top of MMIO region defined for specified port.
|
|
*
|
|
* The provided MMIO region must be mapped prior to call. Online state means
|
|
* that the FC link layer has synced, completed the handshaking process, and
|
|
* is ready for login to start.
|
|
*/
|
|
static void set_port_online(__be64 __iomem *fc_regs)
|
|
{
|
|
u64 cmdcfg;
|
|
|
|
cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]);
|
|
cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */
|
|
cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */
|
|
writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]);
|
|
}
|
|
|
|
/**
|
|
* set_port_offline() - transitions the specified host FC port to offline state
|
|
* @fc_regs: Top of MMIO region defined for specified port.
|
|
*
|
|
* The provided MMIO region must be mapped prior to call.
|
|
*/
|
|
static void set_port_offline(__be64 __iomem *fc_regs)
|
|
{
|
|
u64 cmdcfg;
|
|
|
|
cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]);
|
|
cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */
|
|
cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */
|
|
writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]);
|
|
}
|
|
|
|
/**
|
|
* wait_port_online() - waits for the specified host FC port come online
|
|
* @fc_regs: Top of MMIO region defined for specified port.
|
|
* @delay_us: Number of microseconds to delay between reading port status.
|
|
* @nretry: Number of cycles to retry reading port status.
|
|
*
|
|
* The provided MMIO region must be mapped prior to call. This will timeout
|
|
* when the cable is not plugged in.
|
|
*
|
|
* Return:
|
|
* TRUE (1) when the specified port is online
|
|
* FALSE (0) when the specified port fails to come online after timeout
|
|
*/
|
|
static bool wait_port_online(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry)
|
|
{
|
|
u64 status;
|
|
|
|
WARN_ON(delay_us < 1000);
|
|
|
|
do {
|
|
msleep(delay_us / 1000);
|
|
status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]);
|
|
if (status == U64_MAX)
|
|
nretry /= 2;
|
|
} while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE &&
|
|
nretry--);
|
|
|
|
return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE);
|
|
}
|
|
|
|
/**
|
|
* wait_port_offline() - waits for the specified host FC port go offline
|
|
* @fc_regs: Top of MMIO region defined for specified port.
|
|
* @delay_us: Number of microseconds to delay between reading port status.
|
|
* @nretry: Number of cycles to retry reading port status.
|
|
*
|
|
* The provided MMIO region must be mapped prior to call.
|
|
*
|
|
* Return:
|
|
* TRUE (1) when the specified port is offline
|
|
* FALSE (0) when the specified port fails to go offline after timeout
|
|
*/
|
|
static bool wait_port_offline(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry)
|
|
{
|
|
u64 status;
|
|
|
|
WARN_ON(delay_us < 1000);
|
|
|
|
do {
|
|
msleep(delay_us / 1000);
|
|
status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]);
|
|
if (status == U64_MAX)
|
|
nretry /= 2;
|
|
} while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE &&
|
|
nretry--);
|
|
|
|
return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE);
|
|
}
|
|
|
|
/**
|
|
* afu_set_wwpn() - configures the WWPN for the specified host FC port
|
|
* @afu: AFU associated with the host that owns the specified FC port.
|
|
* @port: Port number being configured.
|
|
* @fc_regs: Top of MMIO region defined for specified port.
|
|
* @wwpn: The world-wide-port-number previously discovered for port.
|
|
*
|
|
* The provided MMIO region must be mapped prior to call. As part of the
|
|
* sequence to configure the WWPN, the port is toggled offline and then back
|
|
* online. This toggling action can cause this routine to delay up to a few
|
|
* seconds. When configured to use the internal LUN feature of the AFU, a
|
|
* failure to come online is overridden.
|
|
*/
|
|
static void afu_set_wwpn(struct afu *afu, int port, __be64 __iomem *fc_regs,
|
|
u64 wwpn)
|
|
{
|
|
struct cxlflash_cfg *cfg = afu->parent;
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
set_port_offline(fc_regs);
|
|
if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US,
|
|
FC_PORT_STATUS_RETRY_CNT)) {
|
|
dev_dbg(dev, "%s: wait on port %d to go offline timed out\n",
|
|
__func__, port);
|
|
}
|
|
|
|
writeq_be(wwpn, &fc_regs[FC_PNAME / 8]);
|
|
|
|
set_port_online(fc_regs);
|
|
if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US,
|
|
FC_PORT_STATUS_RETRY_CNT)) {
|
|
dev_dbg(dev, "%s: wait on port %d to go online timed out\n",
|
|
__func__, port);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* afu_link_reset() - resets the specified host FC port
|
|
* @afu: AFU associated with the host that owns the specified FC port.
|
|
* @port: Port number being configured.
|
|
* @fc_regs: Top of MMIO region defined for specified port.
|
|
*
|
|
* The provided MMIO region must be mapped prior to call. The sequence to
|
|
* reset the port involves toggling it offline and then back online. This
|
|
* action can cause this routine to delay up to a few seconds. An effort
|
|
* is made to maintain link with the device by switching to host to use
|
|
* the alternate port exclusively while the reset takes place.
|
|
* failure to come online is overridden.
|
|
*/
|
|
static void afu_link_reset(struct afu *afu, int port, __be64 __iomem *fc_regs)
|
|
{
|
|
struct cxlflash_cfg *cfg = afu->parent;
|
|
struct device *dev = &cfg->dev->dev;
|
|
u64 port_sel;
|
|
|
|
/* first switch the AFU to the other links, if any */
|
|
port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel);
|
|
port_sel &= ~(1ULL << port);
|
|
writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
|
|
cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
|
|
|
|
set_port_offline(fc_regs);
|
|
if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US,
|
|
FC_PORT_STATUS_RETRY_CNT))
|
|
dev_err(dev, "%s: wait on port %d to go offline timed out\n",
|
|
__func__, port);
|
|
|
|
set_port_online(fc_regs);
|
|
if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US,
|
|
FC_PORT_STATUS_RETRY_CNT))
|
|
dev_err(dev, "%s: wait on port %d to go online timed out\n",
|
|
__func__, port);
|
|
|
|
/* switch back to include this port */
|
|
port_sel |= (1ULL << port);
|
|
writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
|
|
cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
|
|
|
|
dev_dbg(dev, "%s: returning port_sel=%016llx\n", __func__, port_sel);
|
|
}
|
|
|
|
/*
|
|
* Asynchronous interrupt information table
|
|
*
|
|
* NOTE: The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
|
|
* as complex and complains because it is not wrapped with parentheses/braces.
|
|
*/
|
|
#define ASTATUS_FC(_a, _b, _c, _d) \
|
|
{ SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
|
|
|
|
#define BUILD_SISL_ASTATUS_FC_PORT(_a) \
|
|
ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET), \
|
|
ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
|
|
ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
|
|
ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
|
|
ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
|
|
ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
|
|
ASTATUS_FC(_a, LINK_DN, "link down", 0), \
|
|
ASTATUS_FC(_a, LINK_UP, "link up", 0)
|
|
|
|
static const struct asyc_intr_info ainfo[] = {
|
|
BUILD_SISL_ASTATUS_FC_PORT(2),
|
|
BUILD_SISL_ASTATUS_FC_PORT(3),
|
|
BUILD_SISL_ASTATUS_FC_PORT(0),
|
|
BUILD_SISL_ASTATUS_FC_PORT(1),
|
|
{ 0x0, "", 0, 0 }
|
|
};
|
|
|
|
/**
|
|
* find_ainfo() - locates and returns asynchronous interrupt information
|
|
* @status: Status code set by AFU on error.
|
|
*
|
|
* Return: The located information or NULL when the status code is invalid.
|
|
*/
|
|
static const struct asyc_intr_info *find_ainfo(u64 status)
|
|
{
|
|
const struct asyc_intr_info *info;
|
|
|
|
BUILD_BUG_ON(ainfo[ARRAY_SIZE(ainfo) - 1].status != 0);
|
|
|
|
for (info = &ainfo[0]; info->status; info++)
|
|
if (info->status == status)
|
|
return info;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* afu_err_intr_init() - clears and initializes the AFU for error interrupts
|
|
* @afu: AFU associated with the host.
|
|
*/
|
|
static void afu_err_intr_init(struct afu *afu)
|
|
{
|
|
struct cxlflash_cfg *cfg = afu->parent;
|
|
__be64 __iomem *fc_port_regs;
|
|
int i;
|
|
u64 reg;
|
|
|
|
/* global async interrupts: AFU clears afu_ctrl on context exit
|
|
* if async interrupts were sent to that context. This prevents
|
|
* the AFU form sending further async interrupts when
|
|
* there is
|
|
* nobody to receive them.
|
|
*/
|
|
|
|
/* mask all */
|
|
writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask);
|
|
/* set LISN# to send and point to master context */
|
|
reg = ((u64) (((afu->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40);
|
|
|
|
if (afu->internal_lun)
|
|
reg |= 1; /* Bit 63 indicates local lun */
|
|
writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl);
|
|
/* clear all */
|
|
writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear);
|
|
/* unmask bits that are of interest */
|
|
/* note: afu can send an interrupt after this step */
|
|
writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask);
|
|
/* clear again in case a bit came on after previous clear but before */
|
|
/* unmask */
|
|
writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear);
|
|
|
|
/* Clear/Set internal lun bits */
|
|
fc_port_regs = get_fc_port_regs(cfg, 0);
|
|
reg = readq_be(&fc_port_regs[FC_CONFIG2 / 8]);
|
|
reg &= SISL_FC_INTERNAL_MASK;
|
|
if (afu->internal_lun)
|
|
reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT);
|
|
writeq_be(reg, &fc_port_regs[FC_CONFIG2 / 8]);
|
|
|
|
/* now clear FC errors */
|
|
for (i = 0; i < cfg->num_fc_ports; i++) {
|
|
fc_port_regs = get_fc_port_regs(cfg, i);
|
|
|
|
writeq_be(0xFFFFFFFFU, &fc_port_regs[FC_ERROR / 8]);
|
|
writeq_be(0, &fc_port_regs[FC_ERRCAP / 8]);
|
|
}
|
|
|
|
/* sync interrupts for master's IOARRIN write */
|
|
/* note that unlike asyncs, there can be no pending sync interrupts */
|
|
/* at this time (this is a fresh context and master has not written */
|
|
/* IOARRIN yet), so there is nothing to clear. */
|
|
|
|
/* set LISN#, it is always sent to the context that wrote IOARRIN */
|
|
writeq_be(SISL_MSI_SYNC_ERROR, &afu->host_map->ctx_ctrl);
|
|
writeq_be(SISL_ISTATUS_MASK, &afu->host_map->intr_mask);
|
|
}
|
|
|
|
/**
|
|
* cxlflash_sync_err_irq() - interrupt handler for synchronous errors
|
|
* @irq: Interrupt number.
|
|
* @data: Private data provided at interrupt registration, the AFU.
|
|
*
|
|
* Return: Always return IRQ_HANDLED.
|
|
*/
|
|
static irqreturn_t cxlflash_sync_err_irq(int irq, void *data)
|
|
{
|
|
struct afu *afu = (struct afu *)data;
|
|
struct cxlflash_cfg *cfg = afu->parent;
|
|
struct device *dev = &cfg->dev->dev;
|
|
u64 reg;
|
|
u64 reg_unmasked;
|
|
|
|
reg = readq_be(&afu->host_map->intr_status);
|
|
reg_unmasked = (reg & SISL_ISTATUS_UNMASK);
|
|
|
|
if (reg_unmasked == 0UL) {
|
|
dev_err(dev, "%s: spurious interrupt, intr_status=%016llx\n",
|
|
__func__, reg);
|
|
goto cxlflash_sync_err_irq_exit;
|
|
}
|
|
|
|
dev_err(dev, "%s: unexpected interrupt, intr_status=%016llx\n",
|
|
__func__, reg);
|
|
|
|
writeq_be(reg_unmasked, &afu->host_map->intr_clear);
|
|
|
|
cxlflash_sync_err_irq_exit:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* process_hrrq() - process the read-response queue
|
|
* @afu: AFU associated with the host.
|
|
* @doneq: Queue of commands harvested from the RRQ.
|
|
* @budget: Threshold of RRQ entries to process.
|
|
*
|
|
* This routine must be called holding the disabled RRQ spin lock.
|
|
*
|
|
* Return: The number of entries processed.
|
|
*/
|
|
static int process_hrrq(struct afu *afu, struct list_head *doneq, int budget)
|
|
{
|
|
struct afu_cmd *cmd;
|
|
struct sisl_ioasa *ioasa;
|
|
struct sisl_ioarcb *ioarcb;
|
|
bool toggle = afu->toggle;
|
|
int num_hrrq = 0;
|
|
u64 entry,
|
|
*hrrq_start = afu->hrrq_start,
|
|
*hrrq_end = afu->hrrq_end,
|
|
*hrrq_curr = afu->hrrq_curr;
|
|
|
|
/* Process ready RRQ entries up to the specified budget (if any) */
|
|
while (true) {
|
|
entry = *hrrq_curr;
|
|
|
|
if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle)
|
|
break;
|
|
|
|
entry &= ~SISL_RESP_HANDLE_T_BIT;
|
|
|
|
if (afu_is_sq_cmd_mode(afu)) {
|
|
ioasa = (struct sisl_ioasa *)entry;
|
|
cmd = container_of(ioasa, struct afu_cmd, sa);
|
|
} else {
|
|
ioarcb = (struct sisl_ioarcb *)entry;
|
|
cmd = container_of(ioarcb, struct afu_cmd, rcb);
|
|
}
|
|
|
|
list_add_tail(&cmd->queue, doneq);
|
|
|
|
/* Advance to next entry or wrap and flip the toggle bit */
|
|
if (hrrq_curr < hrrq_end)
|
|
hrrq_curr++;
|
|
else {
|
|
hrrq_curr = hrrq_start;
|
|
toggle ^= SISL_RESP_HANDLE_T_BIT;
|
|
}
|
|
|
|
atomic_inc(&afu->hsq_credits);
|
|
num_hrrq++;
|
|
|
|
if (budget > 0 && num_hrrq >= budget)
|
|
break;
|
|
}
|
|
|
|
afu->hrrq_curr = hrrq_curr;
|
|
afu->toggle = toggle;
|
|
|
|
return num_hrrq;
|
|
}
|
|
|
|
/**
|
|
* process_cmd_doneq() - process a queue of harvested RRQ commands
|
|
* @doneq: Queue of completed commands.
|
|
*
|
|
* Note that upon return the queue can no longer be trusted.
|
|
*/
|
|
static void process_cmd_doneq(struct list_head *doneq)
|
|
{
|
|
struct afu_cmd *cmd, *tmp;
|
|
|
|
WARN_ON(list_empty(doneq));
|
|
|
|
list_for_each_entry_safe(cmd, tmp, doneq, queue)
|
|
cmd_complete(cmd);
|
|
}
|
|
|
|
/**
|
|
* cxlflash_irqpoll() - process a queue of harvested RRQ commands
|
|
* @irqpoll: IRQ poll structure associated with queue to poll.
|
|
* @budget: Threshold of RRQ entries to process per poll.
|
|
*
|
|
* Return: The number of entries processed.
|
|
*/
|
|
static int cxlflash_irqpoll(struct irq_poll *irqpoll, int budget)
|
|
{
|
|
struct afu *afu = container_of(irqpoll, struct afu, irqpoll);
|
|
unsigned long hrrq_flags;
|
|
LIST_HEAD(doneq);
|
|
int num_entries = 0;
|
|
|
|
spin_lock_irqsave(&afu->hrrq_slock, hrrq_flags);
|
|
|
|
num_entries = process_hrrq(afu, &doneq, budget);
|
|
if (num_entries < budget)
|
|
irq_poll_complete(irqpoll);
|
|
|
|
spin_unlock_irqrestore(&afu->hrrq_slock, hrrq_flags);
|
|
|
|
process_cmd_doneq(&doneq);
|
|
return num_entries;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
|
|
* @irq: Interrupt number.
|
|
* @data: Private data provided at interrupt registration, the AFU.
|
|
*
|
|
* Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
|
|
*/
|
|
static irqreturn_t cxlflash_rrq_irq(int irq, void *data)
|
|
{
|
|
struct afu *afu = (struct afu *)data;
|
|
unsigned long hrrq_flags;
|
|
LIST_HEAD(doneq);
|
|
int num_entries = 0;
|
|
|
|
spin_lock_irqsave(&afu->hrrq_slock, hrrq_flags);
|
|
|
|
if (afu_is_irqpoll_enabled(afu)) {
|
|
irq_poll_sched(&afu->irqpoll);
|
|
spin_unlock_irqrestore(&afu->hrrq_slock, hrrq_flags);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
num_entries = process_hrrq(afu, &doneq, -1);
|
|
spin_unlock_irqrestore(&afu->hrrq_slock, hrrq_flags);
|
|
|
|
if (num_entries == 0)
|
|
return IRQ_NONE;
|
|
|
|
process_cmd_doneq(&doneq);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_async_err_irq() - interrupt handler for asynchronous errors
|
|
* @irq: Interrupt number.
|
|
* @data: Private data provided at interrupt registration, the AFU.
|
|
*
|
|
* Return: Always return IRQ_HANDLED.
|
|
*/
|
|
static irqreturn_t cxlflash_async_err_irq(int irq, void *data)
|
|
{
|
|
struct afu *afu = (struct afu *)data;
|
|
struct cxlflash_cfg *cfg = afu->parent;
|
|
struct device *dev = &cfg->dev->dev;
|
|
u64 reg_unmasked;
|
|
const struct asyc_intr_info *info;
|
|
struct sisl_global_map __iomem *global = &afu->afu_map->global;
|
|
__be64 __iomem *fc_port_regs;
|
|
u64 reg;
|
|
u8 port;
|
|
int i;
|
|
|
|
reg = readq_be(&global->regs.aintr_status);
|
|
reg_unmasked = (reg & SISL_ASTATUS_UNMASK);
|
|
|
|
if (reg_unmasked == 0) {
|
|
dev_err(dev, "%s: spurious interrupt, aintr_status=%016llx\n",
|
|
__func__, reg);
|
|
goto out;
|
|
}
|
|
|
|
/* FYI, it is 'okay' to clear AFU status before FC_ERROR */
|
|
writeq_be(reg_unmasked, &global->regs.aintr_clear);
|
|
|
|
/* Check each bit that is on */
|
|
for (i = 0; reg_unmasked; i++, reg_unmasked = (reg_unmasked >> 1)) {
|
|
info = find_ainfo(1ULL << i);
|
|
if (((reg_unmasked & 0x1) == 0) || !info)
|
|
continue;
|
|
|
|
port = info->port;
|
|
fc_port_regs = get_fc_port_regs(cfg, port);
|
|
|
|
dev_err(dev, "%s: FC Port %d -> %s, fc_status=%016llx\n",
|
|
__func__, port, info->desc,
|
|
readq_be(&fc_port_regs[FC_STATUS / 8]));
|
|
|
|
/*
|
|
* Do link reset first, some OTHER errors will set FC_ERROR
|
|
* again if cleared before or w/o a reset
|
|
*/
|
|
if (info->action & LINK_RESET) {
|
|
dev_err(dev, "%s: FC Port %d: resetting link\n",
|
|
__func__, port);
|
|
cfg->lr_state = LINK_RESET_REQUIRED;
|
|
cfg->lr_port = port;
|
|
schedule_work(&cfg->work_q);
|
|
}
|
|
|
|
if (info->action & CLR_FC_ERROR) {
|
|
reg = readq_be(&fc_port_regs[FC_ERROR / 8]);
|
|
|
|
/*
|
|
* Since all errors are unmasked, FC_ERROR and FC_ERRCAP
|
|
* should be the same and tracing one is sufficient.
|
|
*/
|
|
|
|
dev_err(dev, "%s: fc %d: clearing fc_error=%016llx\n",
|
|
__func__, port, reg);
|
|
|
|
writeq_be(reg, &fc_port_regs[FC_ERROR / 8]);
|
|
writeq_be(0, &fc_port_regs[FC_ERRCAP / 8]);
|
|
}
|
|
|
|
if (info->action & SCAN_HOST) {
|
|
atomic_inc(&cfg->scan_host_needed);
|
|
schedule_work(&cfg->work_q);
|
|
}
|
|
}
|
|
|
|
out:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* start_context() - starts the master context
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Return: A success or failure value from CXL services.
|
|
*/
|
|
static int start_context(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct device *dev = &cfg->dev->dev;
|
|
int rc = 0;
|
|
|
|
rc = cxl_start_context(cfg->mcctx,
|
|
cfg->afu->work.work_element_descriptor,
|
|
NULL);
|
|
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* read_vpd() - obtains the WWPNs from VPD
|
|
* @cfg: Internal structure associated with the host.
|
|
* @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[])
|
|
{
|
|
struct device *dev = &cfg->dev->dev;
|
|
struct pci_dev *pdev = cfg->dev;
|
|
int rc = 0;
|
|
int ro_start, ro_size, i, j, k;
|
|
ssize_t vpd_size;
|
|
char vpd_data[CXLFLASH_VPD_LEN];
|
|
char tmp_buf[WWPN_BUF_LEN] = { 0 };
|
|
char *wwpn_vpd_tags[MAX_FC_PORTS] = { "V5", "V6", "V7", "V8" };
|
|
|
|
/* Get the VPD data from the device */
|
|
vpd_size = cxl_read_adapter_vpd(pdev, vpd_data, sizeof(vpd_data));
|
|
if (unlikely(vpd_size <= 0)) {
|
|
dev_err(dev, "%s: Unable to read VPD (size = %ld)\n",
|
|
__func__, vpd_size);
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
/* Get the read only section offset */
|
|
ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size,
|
|
PCI_VPD_LRDT_RO_DATA);
|
|
if (unlikely(ro_start < 0)) {
|
|
dev_err(dev, "%s: VPD Read-only data not found\n", __func__);
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
/* Get the read only section size, cap when extends beyond read VPD */
|
|
ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]);
|
|
j = ro_size;
|
|
i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
|
|
if (unlikely((i + j) > vpd_size)) {
|
|
dev_dbg(dev, "%s: Might need to read more VPD (%d > %ld)\n",
|
|
__func__, (i + j), vpd_size);
|
|
ro_size = vpd_size - i;
|
|
}
|
|
|
|
/*
|
|
* Find the offset of the WWPN tag within the read only
|
|
* VPD data and validate the found field (partials are
|
|
* no good to us). Convert the ASCII data to an integer
|
|
* value. Note that we must copy to a temporary buffer
|
|
* because the conversion service requires that the ASCII
|
|
* string be terminated.
|
|
*/
|
|
for (k = 0; k < cfg->num_fc_ports; k++) {
|
|
j = ro_size;
|
|
i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
|
|
|
|
i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]);
|
|
if (unlikely(i < 0)) {
|
|
dev_err(dev, "%s: Port %d WWPN not found in VPD\n",
|
|
__func__, k);
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
j = pci_vpd_info_field_size(&vpd_data[i]);
|
|
i += PCI_VPD_INFO_FLD_HDR_SIZE;
|
|
if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) {
|
|
dev_err(dev, "%s: Port %d WWPN incomplete or bad VPD\n",
|
|
__func__, k);
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
memcpy(tmp_buf, &vpd_data[i], WWPN_LEN);
|
|
rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]);
|
|
if (unlikely(rc)) {
|
|
dev_err(dev, "%s: WWPN conversion failed for port %d\n",
|
|
__func__, k);
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: wwpn%d=%016llx\n", __func__, k, wwpn[k]);
|
|
}
|
|
|
|
out:
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* init_pcr() - initialize the provisioning and control registers
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Also sets up fast access to the mapped registers and initializes AFU
|
|
* command fields that never change.
|
|
*/
|
|
static void init_pcr(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
struct sisl_ctrl_map __iomem *ctrl_map;
|
|
int i;
|
|
|
|
for (i = 0; i < MAX_CONTEXT; i++) {
|
|
ctrl_map = &afu->afu_map->ctrls[i].ctrl;
|
|
/* Disrupt any clients that could be running */
|
|
/* e.g. clients that survived a master restart */
|
|
writeq_be(0, &ctrl_map->rht_start);
|
|
writeq_be(0, &ctrl_map->rht_cnt_id);
|
|
writeq_be(0, &ctrl_map->ctx_cap);
|
|
}
|
|
|
|
/* Copy frequently used fields into afu */
|
|
afu->ctx_hndl = (u16) cxl_process_element(cfg->mcctx);
|
|
afu->host_map = &afu->afu_map->hosts[afu->ctx_hndl].host;
|
|
afu->ctrl_map = &afu->afu_map->ctrls[afu->ctx_hndl].ctrl;
|
|
|
|
/* Program the Endian Control for the master context */
|
|
writeq_be(SISL_ENDIAN_CTRL, &afu->host_map->endian_ctrl);
|
|
}
|
|
|
|
/**
|
|
* init_global() - initialize AFU global registers
|
|
* @cfg: Internal structure associated with the host.
|
|
*/
|
|
static int init_global(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
__be64 __iomem *fc_port_regs;
|
|
u64 wwpn[MAX_FC_PORTS]; /* wwpn of AFU ports */
|
|
int i = 0, num_ports = 0;
|
|
int rc = 0;
|
|
u64 reg;
|
|
|
|
rc = read_vpd(cfg, &wwpn[0]);
|
|
if (rc) {
|
|
dev_err(dev, "%s: could not read vpd rc=%d\n", __func__, rc);
|
|
goto out;
|
|
}
|
|
|
|
/* Set up RRQ and SQ in AFU for master issued cmds */
|
|
writeq_be((u64) afu->hrrq_start, &afu->host_map->rrq_start);
|
|
writeq_be((u64) afu->hrrq_end, &afu->host_map->rrq_end);
|
|
|
|
if (afu_is_sq_cmd_mode(afu)) {
|
|
writeq_be((u64)afu->hsq_start, &afu->host_map->sq_start);
|
|
writeq_be((u64)afu->hsq_end, &afu->host_map->sq_end);
|
|
}
|
|
|
|
/* AFU configuration */
|
|
reg = readq_be(&afu->afu_map->global.regs.afu_config);
|
|
reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN;
|
|
/* enable all auto retry options and control endianness */
|
|
/* leave others at default: */
|
|
/* CTX_CAP write protected, mbox_r does not clear on read and */
|
|
/* checker on if dual afu */
|
|
writeq_be(reg, &afu->afu_map->global.regs.afu_config);
|
|
|
|
/* Global port select: select either port */
|
|
if (afu->internal_lun) {
|
|
/* Only use port 0 */
|
|
writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel);
|
|
num_ports = 0;
|
|
} else {
|
|
writeq_be(PORT_MASK(cfg->num_fc_ports),
|
|
&afu->afu_map->global.regs.afu_port_sel);
|
|
num_ports = cfg->num_fc_ports;
|
|
}
|
|
|
|
for (i = 0; i < num_ports; i++) {
|
|
fc_port_regs = get_fc_port_regs(cfg, i);
|
|
|
|
/* Unmask all errors (but they are still masked at AFU) */
|
|
writeq_be(0, &fc_port_regs[FC_ERRMSK / 8]);
|
|
/* Clear CRC error cnt & set a threshold */
|
|
(void)readq_be(&fc_port_regs[FC_CNT_CRCERR / 8]);
|
|
writeq_be(MC_CRC_THRESH, &fc_port_regs[FC_CRC_THRESH / 8]);
|
|
|
|
/* Set WWPNs. If already programmed, wwpn[i] is 0 */
|
|
if (wwpn[i] != 0)
|
|
afu_set_wwpn(afu, i, &fc_port_regs[0], wwpn[i]);
|
|
/* Programming WWPN back to back causes additional
|
|
* offline/online transitions and a PLOGI
|
|
*/
|
|
msleep(100);
|
|
}
|
|
|
|
/* Set up master's own CTX_CAP to allow real mode, host translation */
|
|
/* tables, afu cmds and read/write GSCSI cmds. */
|
|
/* First, unlock ctx_cap write by reading mbox */
|
|
(void)readq_be(&afu->ctrl_map->mbox_r); /* unlock ctx_cap */
|
|
writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE |
|
|
SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD |
|
|
SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD),
|
|
&afu->ctrl_map->ctx_cap);
|
|
/* Initialize heartbeat */
|
|
afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* start_afu() - initializes and starts the AFU
|
|
* @cfg: Internal structure associated with the host.
|
|
*/
|
|
static int start_afu(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
int rc = 0;
|
|
|
|
init_pcr(cfg);
|
|
|
|
/* Initialize RRQ */
|
|
memset(&afu->rrq_entry, 0, sizeof(afu->rrq_entry));
|
|
afu->hrrq_start = &afu->rrq_entry[0];
|
|
afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1];
|
|
afu->hrrq_curr = afu->hrrq_start;
|
|
afu->toggle = 1;
|
|
spin_lock_init(&afu->hrrq_slock);
|
|
|
|
/* Initialize SQ */
|
|
if (afu_is_sq_cmd_mode(afu)) {
|
|
memset(&afu->sq, 0, sizeof(afu->sq));
|
|
afu->hsq_start = &afu->sq[0];
|
|
afu->hsq_end = &afu->sq[NUM_SQ_ENTRY - 1];
|
|
afu->hsq_curr = afu->hsq_start;
|
|
|
|
spin_lock_init(&afu->hsq_slock);
|
|
atomic_set(&afu->hsq_credits, NUM_SQ_ENTRY - 1);
|
|
}
|
|
|
|
/* Initialize IRQ poll */
|
|
if (afu_is_irqpoll_enabled(afu))
|
|
irq_poll_init(&afu->irqpoll, afu->irqpoll_weight,
|
|
cxlflash_irqpoll);
|
|
|
|
rc = init_global(cfg);
|
|
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* init_intr() - setup interrupt handlers for the master context
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static enum undo_level init_intr(struct cxlflash_cfg *cfg,
|
|
struct cxl_context *ctx)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
int rc = 0;
|
|
enum undo_level level = UNDO_NOOP;
|
|
|
|
rc = cxl_allocate_afu_irqs(ctx, 3);
|
|
if (unlikely(rc)) {
|
|
dev_err(dev, "%s: allocate_afu_irqs failed rc=%d\n",
|
|
__func__, rc);
|
|
level = UNDO_NOOP;
|
|
goto out;
|
|
}
|
|
|
|
rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, afu,
|
|
"SISL_MSI_SYNC_ERROR");
|
|
if (unlikely(rc <= 0)) {
|
|
dev_err(dev, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__);
|
|
level = FREE_IRQ;
|
|
goto out;
|
|
}
|
|
|
|
rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, afu,
|
|
"SISL_MSI_RRQ_UPDATED");
|
|
if (unlikely(rc <= 0)) {
|
|
dev_err(dev, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__);
|
|
level = UNMAP_ONE;
|
|
goto out;
|
|
}
|
|
|
|
rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, afu,
|
|
"SISL_MSI_ASYNC_ERROR");
|
|
if (unlikely(rc <= 0)) {
|
|
dev_err(dev, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__);
|
|
level = UNMAP_TWO;
|
|
goto out;
|
|
}
|
|
out:
|
|
return level;
|
|
}
|
|
|
|
/**
|
|
* init_mc() - create and register as the master context
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int init_mc(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct cxl_context *ctx;
|
|
struct device *dev = &cfg->dev->dev;
|
|
int rc = 0;
|
|
enum undo_level level;
|
|
|
|
ctx = cxl_get_context(cfg->dev);
|
|
if (unlikely(!ctx)) {
|
|
rc = -ENOMEM;
|
|
goto ret;
|
|
}
|
|
cfg->mcctx = ctx;
|
|
|
|
/* Set it up as a master with the CXL */
|
|
cxl_set_master(ctx);
|
|
|
|
/* During initialization reset the AFU to start from a clean slate */
|
|
rc = cxl_afu_reset(cfg->mcctx);
|
|
if (unlikely(rc)) {
|
|
dev_err(dev, "%s: AFU reset failed rc=%d\n", __func__, rc);
|
|
goto ret;
|
|
}
|
|
|
|
level = init_intr(cfg, ctx);
|
|
if (unlikely(level)) {
|
|
dev_err(dev, "%s: interrupt init failed rc=%d\n", __func__, rc);
|
|
goto out;
|
|
}
|
|
|
|
/* This performs the equivalent of the CXL_IOCTL_START_WORK.
|
|
* The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
|
|
* element (pe) that is embedded in the context (ctx)
|
|
*/
|
|
rc = start_context(cfg);
|
|
if (unlikely(rc)) {
|
|
dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc);
|
|
level = UNMAP_THREE;
|
|
goto out;
|
|
}
|
|
ret:
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
out:
|
|
term_intr(cfg, level);
|
|
goto ret;
|
|
}
|
|
|
|
/**
|
|
* get_num_afu_ports() - determines and configures the number of AFU ports
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* This routine determines the number of AFU ports by converting the global
|
|
* port selection mask. The converted value is only valid following an AFU
|
|
* reset (explicit or power-on). This routine must be invoked shortly after
|
|
* mapping as other routines are dependent on the number of ports during the
|
|
* initialization sequence.
|
|
*
|
|
* To support legacy AFUs that might not have reflected an initial global
|
|
* port mask (value read is 0), default to the number of ports originally
|
|
* supported by the cxlflash driver (2) before hardware with other port
|
|
* offerings was introduced.
|
|
*/
|
|
static void get_num_afu_ports(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
u64 port_mask;
|
|
int num_fc_ports = LEGACY_FC_PORTS;
|
|
|
|
port_mask = readq_be(&afu->afu_map->global.regs.afu_port_sel);
|
|
if (port_mask != 0ULL)
|
|
num_fc_ports = min(ilog2(port_mask) + 1, MAX_FC_PORTS);
|
|
|
|
dev_dbg(dev, "%s: port_mask=%016llx num_fc_ports=%d\n",
|
|
__func__, port_mask, num_fc_ports);
|
|
|
|
cfg->num_fc_ports = num_fc_ports;
|
|
cfg->host->max_channel = PORTNUM2CHAN(num_fc_ports);
|
|
}
|
|
|
|
/**
|
|
* init_afu() - setup as master context and start AFU
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* This routine is a higher level of control for configuring the
|
|
* AFU on probe and reset paths.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int init_afu(struct cxlflash_cfg *cfg)
|
|
{
|
|
u64 reg;
|
|
int rc = 0;
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
cxl_perst_reloads_same_image(cfg->cxl_afu, true);
|
|
|
|
rc = init_mc(cfg);
|
|
if (rc) {
|
|
dev_err(dev, "%s: init_mc failed rc=%d\n",
|
|
__func__, rc);
|
|
goto out;
|
|
}
|
|
|
|
/* Map the entire MMIO space of the AFU */
|
|
afu->afu_map = cxl_psa_map(cfg->mcctx);
|
|
if (!afu->afu_map) {
|
|
dev_err(dev, "%s: cxl_psa_map failed\n", __func__);
|
|
rc = -ENOMEM;
|
|
goto err1;
|
|
}
|
|
|
|
/* No byte reverse on reading afu_version or string will be backwards */
|
|
reg = readq(&afu->afu_map->global.regs.afu_version);
|
|
memcpy(afu->version, ®, sizeof(reg));
|
|
afu->interface_version =
|
|
readq_be(&afu->afu_map->global.regs.interface_version);
|
|
if ((afu->interface_version + 1) == 0) {
|
|
dev_err(dev, "Back level AFU, please upgrade. AFU version %s "
|
|
"interface version %016llx\n", afu->version,
|
|
afu->interface_version);
|
|
rc = -EINVAL;
|
|
goto err1;
|
|
}
|
|
|
|
if (afu_is_sq_cmd_mode(afu)) {
|
|
afu->send_cmd = send_cmd_sq;
|
|
afu->context_reset = context_reset_sq;
|
|
} else {
|
|
afu->send_cmd = send_cmd_ioarrin;
|
|
afu->context_reset = context_reset_ioarrin;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: afu_ver=%s interface_ver=%016llx\n", __func__,
|
|
afu->version, afu->interface_version);
|
|
|
|
get_num_afu_ports(cfg);
|
|
|
|
rc = start_afu(cfg);
|
|
if (rc) {
|
|
dev_err(dev, "%s: start_afu failed, rc=%d\n", __func__, rc);
|
|
goto err1;
|
|
}
|
|
|
|
afu_err_intr_init(cfg->afu);
|
|
spin_lock_init(&afu->rrin_slock);
|
|
afu->room = readq_be(&afu->host_map->cmd_room);
|
|
|
|
/* Restore the LUN mappings */
|
|
cxlflash_restore_luntable(cfg);
|
|
out:
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
|
|
err1:
|
|
term_intr(cfg, UNMAP_THREE);
|
|
term_mc(cfg);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_afu_sync() - builds and sends an AFU sync command
|
|
* @afu: AFU associated with the host.
|
|
* @ctx_hndl_u: Identifies context requesting sync.
|
|
* @res_hndl_u: Identifies resource requesting sync.
|
|
* @mode: Type of sync to issue (lightweight, heavyweight, global).
|
|
*
|
|
* The AFU can only take 1 sync command at a time. This routine enforces this
|
|
* limitation by using a mutex to provide exclusive access to the AFU during
|
|
* the sync. This design point requires calling threads to not be on interrupt
|
|
* context due to the possibility of sleeping during concurrent sync operations.
|
|
*
|
|
* AFU sync operations are only necessary and allowed when the device is
|
|
* operating normally. When not operating normally, sync requests can occur as
|
|
* part of cleaning up resources associated with an adapter prior to removal.
|
|
* In this scenario, these requests are simply ignored (safe due to the AFU
|
|
* going away).
|
|
*
|
|
* Return:
|
|
* 0 on success
|
|
* -1 on failure
|
|
*/
|
|
int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u,
|
|
res_hndl_t res_hndl_u, u8 mode)
|
|
{
|
|
struct cxlflash_cfg *cfg = afu->parent;
|
|
struct device *dev = &cfg->dev->dev;
|
|
struct afu_cmd *cmd = NULL;
|
|
char *buf = NULL;
|
|
int rc = 0;
|
|
static DEFINE_MUTEX(sync_active);
|
|
|
|
if (cfg->state != STATE_NORMAL) {
|
|
dev_dbg(dev, "%s: Sync not required state=%u\n",
|
|
__func__, cfg->state);
|
|
return 0;
|
|
}
|
|
|
|
mutex_lock(&sync_active);
|
|
atomic_inc(&afu->cmds_active);
|
|
buf = kzalloc(sizeof(*cmd) + __alignof__(*cmd) - 1, GFP_KERNEL);
|
|
if (unlikely(!buf)) {
|
|
dev_err(dev, "%s: no memory for command\n", __func__);
|
|
rc = -1;
|
|
goto out;
|
|
}
|
|
|
|
cmd = (struct afu_cmd *)PTR_ALIGN(buf, __alignof__(*cmd));
|
|
init_completion(&cmd->cevent);
|
|
cmd->parent = afu;
|
|
|
|
dev_dbg(dev, "%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u);
|
|
|
|
cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD;
|
|
cmd->rcb.ctx_id = afu->ctx_hndl;
|
|
cmd->rcb.msi = SISL_MSI_RRQ_UPDATED;
|
|
cmd->rcb.timeout = MC_AFU_SYNC_TIMEOUT;
|
|
|
|
cmd->rcb.cdb[0] = 0xC0; /* AFU Sync */
|
|
cmd->rcb.cdb[1] = mode;
|
|
|
|
/* The cdb is aligned, no unaligned accessors required */
|
|
*((__be16 *)&cmd->rcb.cdb[2]) = cpu_to_be16(ctx_hndl_u);
|
|
*((__be32 *)&cmd->rcb.cdb[4]) = cpu_to_be32(res_hndl_u);
|
|
|
|
rc = afu->send_cmd(afu, cmd);
|
|
if (unlikely(rc))
|
|
goto out;
|
|
|
|
rc = wait_resp(afu, cmd);
|
|
if (unlikely(rc))
|
|
rc = -1;
|
|
out:
|
|
atomic_dec(&afu->cmds_active);
|
|
mutex_unlock(&sync_active);
|
|
kfree(buf);
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* afu_reset() - resets the AFU
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int afu_reset(struct cxlflash_cfg *cfg)
|
|
{
|
|
struct device *dev = &cfg->dev->dev;
|
|
int rc = 0;
|
|
|
|
/* Stop the context before the reset. Since the context is
|
|
* no longer available restart it after the reset is complete
|
|
*/
|
|
term_afu(cfg);
|
|
|
|
rc = init_afu(cfg);
|
|
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* drain_ioctls() - wait until all currently executing ioctls have completed
|
|
* @cfg: Internal structure associated with the host.
|
|
*
|
|
* Obtain write access to read/write semaphore that wraps ioctl
|
|
* handling to 'drain' ioctls currently executing.
|
|
*/
|
|
static void drain_ioctls(struct cxlflash_cfg *cfg)
|
|
{
|
|
down_write(&cfg->ioctl_rwsem);
|
|
up_write(&cfg->ioctl_rwsem);
|
|
}
|
|
|
|
/**
|
|
* cxlflash_eh_device_reset_handler() - reset a single LUN
|
|
* @scp: SCSI command to send.
|
|
*
|
|
* Return:
|
|
* SUCCESS as defined in scsi/scsi.h
|
|
* FAILED as defined in scsi/scsi.h
|
|
*/
|
|
static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp)
|
|
{
|
|
int rc = SUCCESS;
|
|
struct Scsi_Host *host = scp->device->host;
|
|
struct cxlflash_cfg *cfg = shost_priv(host);
|
|
struct device *dev = &cfg->dev->dev;
|
|
struct afu *afu = cfg->afu;
|
|
int rcr = 0;
|
|
|
|
dev_dbg(dev, "%s: (scp=%p) %d/%d/%d/%llu "
|
|
"cdb=(%08x-%08x-%08x-%08x)\n", __func__, scp, host->host_no,
|
|
scp->device->channel, scp->device->id, scp->device->lun,
|
|
get_unaligned_be32(&((u32 *)scp->cmnd)[0]),
|
|
get_unaligned_be32(&((u32 *)scp->cmnd)[1]),
|
|
get_unaligned_be32(&((u32 *)scp->cmnd)[2]),
|
|
get_unaligned_be32(&((u32 *)scp->cmnd)[3]));
|
|
|
|
retry:
|
|
switch (cfg->state) {
|
|
case STATE_NORMAL:
|
|
rcr = send_tmf(afu, scp, TMF_LUN_RESET);
|
|
if (unlikely(rcr))
|
|
rc = FAILED;
|
|
break;
|
|
case STATE_RESET:
|
|
wait_event(cfg->reset_waitq, cfg->state != STATE_RESET);
|
|
goto retry;
|
|
default:
|
|
rc = FAILED;
|
|
break;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_eh_host_reset_handler() - reset the host adapter
|
|
* @scp: SCSI command from stack identifying host.
|
|
*
|
|
* Following a reset, the state is evaluated again in case an EEH occurred
|
|
* during the reset. In such a scenario, the host reset will either yield
|
|
* until the EEH recovery is complete or return success or failure based
|
|
* upon the current device state.
|
|
*
|
|
* Return:
|
|
* SUCCESS as defined in scsi/scsi.h
|
|
* FAILED as defined in scsi/scsi.h
|
|
*/
|
|
static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp)
|
|
{
|
|
int rc = SUCCESS;
|
|
int rcr = 0;
|
|
struct Scsi_Host *host = scp->device->host;
|
|
struct cxlflash_cfg *cfg = shost_priv(host);
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
dev_dbg(dev, "%s: (scp=%p) %d/%d/%d/%llu "
|
|
"cdb=(%08x-%08x-%08x-%08x)\n", __func__, scp, host->host_no,
|
|
scp->device->channel, scp->device->id, scp->device->lun,
|
|
get_unaligned_be32(&((u32 *)scp->cmnd)[0]),
|
|
get_unaligned_be32(&((u32 *)scp->cmnd)[1]),
|
|
get_unaligned_be32(&((u32 *)scp->cmnd)[2]),
|
|
get_unaligned_be32(&((u32 *)scp->cmnd)[3]));
|
|
|
|
switch (cfg->state) {
|
|
case STATE_NORMAL:
|
|
cfg->state = STATE_RESET;
|
|
drain_ioctls(cfg);
|
|
cxlflash_mark_contexts_error(cfg);
|
|
rcr = afu_reset(cfg);
|
|
if (rcr) {
|
|
rc = FAILED;
|
|
cfg->state = STATE_FAILTERM;
|
|
} else
|
|
cfg->state = STATE_NORMAL;
|
|
wake_up_all(&cfg->reset_waitq);
|
|
ssleep(1);
|
|
/* fall through */
|
|
case STATE_RESET:
|
|
wait_event(cfg->reset_waitq, cfg->state != STATE_RESET);
|
|
if (cfg->state == STATE_NORMAL)
|
|
break;
|
|
/* fall through */
|
|
default:
|
|
rc = FAILED;
|
|
break;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_change_queue_depth() - change the queue depth for the device
|
|
* @sdev: SCSI device destined for queue depth change.
|
|
* @qdepth: Requested queue depth value to set.
|
|
*
|
|
* The requested queue depth is capped to the maximum supported value.
|
|
*
|
|
* Return: The actual queue depth set.
|
|
*/
|
|
static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth)
|
|
{
|
|
|
|
if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN)
|
|
qdepth = CXLFLASH_MAX_CMDS_PER_LUN;
|
|
|
|
scsi_change_queue_depth(sdev, qdepth);
|
|
return sdev->queue_depth;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_show_port_status() - queries and presents the current port status
|
|
* @port: Desired port for status reporting.
|
|
* @cfg: Internal structure associated with the host.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf or -EINVAL.
|
|
*/
|
|
static ssize_t cxlflash_show_port_status(u32 port,
|
|
struct cxlflash_cfg *cfg,
|
|
char *buf)
|
|
{
|
|
struct device *dev = &cfg->dev->dev;
|
|
char *disp_status;
|
|
u64 status;
|
|
__be64 __iomem *fc_port_regs;
|
|
|
|
WARN_ON(port >= MAX_FC_PORTS);
|
|
|
|
if (port >= cfg->num_fc_ports) {
|
|
dev_info(dev, "%s: Port %d not supported on this card.\n",
|
|
__func__, port);
|
|
return -EINVAL;
|
|
}
|
|
|
|
fc_port_regs = get_fc_port_regs(cfg, port);
|
|
status = readq_be(&fc_port_regs[FC_MTIP_STATUS / 8]);
|
|
status &= FC_MTIP_STATUS_MASK;
|
|
|
|
if (status == FC_MTIP_STATUS_ONLINE)
|
|
disp_status = "online";
|
|
else if (status == FC_MTIP_STATUS_OFFLINE)
|
|
disp_status = "offline";
|
|
else
|
|
disp_status = "unknown";
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%s\n", disp_status);
|
|
}
|
|
|
|
/**
|
|
* port0_show() - queries and presents the current status of port 0
|
|
* @dev: Generic device associated with the host owning the port.
|
|
* @attr: Device attribute representing the port.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t port0_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
|
|
return cxlflash_show_port_status(0, cfg, buf);
|
|
}
|
|
|
|
/**
|
|
* port1_show() - queries and presents the current status of port 1
|
|
* @dev: Generic device associated with the host owning the port.
|
|
* @attr: Device attribute representing the port.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t port1_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
|
|
return cxlflash_show_port_status(1, cfg, buf);
|
|
}
|
|
|
|
/**
|
|
* port2_show() - queries and presents the current status of port 2
|
|
* @dev: Generic device associated with the host owning the port.
|
|
* @attr: Device attribute representing the port.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t port2_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
|
|
return cxlflash_show_port_status(2, cfg, buf);
|
|
}
|
|
|
|
/**
|
|
* port3_show() - queries and presents the current status of port 3
|
|
* @dev: Generic device associated with the host owning the port.
|
|
* @attr: Device attribute representing the port.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t port3_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
|
|
return cxlflash_show_port_status(3, cfg, buf);
|
|
}
|
|
|
|
/**
|
|
* lun_mode_show() - presents the current LUN mode of the host
|
|
* @dev: Generic device associated with the host.
|
|
* @attr: Device attribute representing the LUN mode.
|
|
* @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t lun_mode_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
struct afu *afu = cfg->afu;
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun);
|
|
}
|
|
|
|
/**
|
|
* lun_mode_store() - sets the LUN mode of the host
|
|
* @dev: Generic device associated with the host.
|
|
* @attr: Device attribute representing the LUN mode.
|
|
* @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
|
|
* @count: Length of data resizing in @buf.
|
|
*
|
|
* The CXL Flash AFU supports a dummy LUN mode where the external
|
|
* links and storage are not required. Space on the FPGA is used
|
|
* to create 1 or 2 small LUNs which are presented to the system
|
|
* as if they were a normal storage device. This feature is useful
|
|
* during development and also provides manufacturing with a way
|
|
* to test the AFU without an actual device.
|
|
*
|
|
* 0 = external LUN[s] (default)
|
|
* 1 = internal LUN (1 x 64K, 512B blocks, id 0)
|
|
* 2 = internal LUN (1 x 64K, 4K blocks, id 0)
|
|
* 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
|
|
* 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t lun_mode_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(dev);
|
|
struct cxlflash_cfg *cfg = shost_priv(shost);
|
|
struct afu *afu = cfg->afu;
|
|
int rc;
|
|
u32 lun_mode;
|
|
|
|
rc = kstrtouint(buf, 10, &lun_mode);
|
|
if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) {
|
|
afu->internal_lun = lun_mode;
|
|
|
|
/*
|
|
* When configured for internal LUN, there is only one channel,
|
|
* channel number 0, else there will be one less than the number
|
|
* of fc ports for this card.
|
|
*/
|
|
if (afu->internal_lun)
|
|
shost->max_channel = 0;
|
|
else
|
|
shost->max_channel = PORTNUM2CHAN(cfg->num_fc_ports);
|
|
|
|
afu_reset(cfg);
|
|
scsi_scan_host(cfg->host);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* ioctl_version_show() - presents the current ioctl version of the host
|
|
* @dev: Generic device associated with the host.
|
|
* @attr: Device attribute representing the ioctl version.
|
|
* @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t ioctl_version_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n", DK_CXLFLASH_VERSION_0);
|
|
}
|
|
|
|
/**
|
|
* cxlflash_show_port_lun_table() - queries and presents the port LUN table
|
|
* @port: Desired port for status reporting.
|
|
* @cfg: Internal structure associated with the host.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf or -EINVAL.
|
|
*/
|
|
static ssize_t cxlflash_show_port_lun_table(u32 port,
|
|
struct cxlflash_cfg *cfg,
|
|
char *buf)
|
|
{
|
|
struct device *dev = &cfg->dev->dev;
|
|
__be64 __iomem *fc_port_luns;
|
|
int i;
|
|
ssize_t bytes = 0;
|
|
|
|
WARN_ON(port >= MAX_FC_PORTS);
|
|
|
|
if (port >= cfg->num_fc_ports) {
|
|
dev_info(dev, "%s: Port %d not supported on this card.\n",
|
|
__func__, port);
|
|
return -EINVAL;
|
|
}
|
|
|
|
fc_port_luns = get_fc_port_luns(cfg, port);
|
|
|
|
for (i = 0; i < CXLFLASH_NUM_VLUNS; i++)
|
|
bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
|
|
"%03d: %016llx\n",
|
|
i, readq_be(&fc_port_luns[i]));
|
|
return bytes;
|
|
}
|
|
|
|
/**
|
|
* port0_lun_table_show() - presents the current LUN table of port 0
|
|
* @dev: Generic device associated with the host owning the port.
|
|
* @attr: Device attribute representing the port.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t port0_lun_table_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
|
|
return cxlflash_show_port_lun_table(0, cfg, buf);
|
|
}
|
|
|
|
/**
|
|
* port1_lun_table_show() - presents the current LUN table of port 1
|
|
* @dev: Generic device associated with the host owning the port.
|
|
* @attr: Device attribute representing the port.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t port1_lun_table_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
|
|
return cxlflash_show_port_lun_table(1, cfg, buf);
|
|
}
|
|
|
|
/**
|
|
* port2_lun_table_show() - presents the current LUN table of port 2
|
|
* @dev: Generic device associated with the host owning the port.
|
|
* @attr: Device attribute representing the port.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t port2_lun_table_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
|
|
return cxlflash_show_port_lun_table(2, cfg, buf);
|
|
}
|
|
|
|
/**
|
|
* port3_lun_table_show() - presents the current LUN table of port 3
|
|
* @dev: Generic device associated with the host owning the port.
|
|
* @attr: Device attribute representing the port.
|
|
* @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t port3_lun_table_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
|
|
return cxlflash_show_port_lun_table(3, cfg, buf);
|
|
}
|
|
|
|
/**
|
|
* irqpoll_weight_show() - presents the current IRQ poll weight for the host
|
|
* @dev: Generic device associated with the host.
|
|
* @attr: Device attribute representing the IRQ poll weight.
|
|
* @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
|
|
* weight in ASCII.
|
|
*
|
|
* An IRQ poll weight of 0 indicates polling is disabled.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t irqpoll_weight_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
struct afu *afu = cfg->afu;
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n", afu->irqpoll_weight);
|
|
}
|
|
|
|
/**
|
|
* irqpoll_weight_store() - sets the current IRQ poll weight for the host
|
|
* @dev: Generic device associated with the host.
|
|
* @attr: Device attribute representing the IRQ poll weight.
|
|
* @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
|
|
* weight in ASCII.
|
|
* @count: Length of data resizing in @buf.
|
|
*
|
|
* An IRQ poll weight of 0 indicates polling is disabled.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t irqpoll_weight_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev));
|
|
struct device *cfgdev = &cfg->dev->dev;
|
|
struct afu *afu = cfg->afu;
|
|
u32 weight;
|
|
int rc;
|
|
|
|
rc = kstrtouint(buf, 10, &weight);
|
|
if (rc)
|
|
return -EINVAL;
|
|
|
|
if (weight > 256) {
|
|
dev_info(cfgdev,
|
|
"Invalid IRQ poll weight. It must be 256 or less.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (weight == afu->irqpoll_weight) {
|
|
dev_info(cfgdev,
|
|
"Current IRQ poll weight has the same weight.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (afu_is_irqpoll_enabled(afu))
|
|
irq_poll_disable(&afu->irqpoll);
|
|
|
|
afu->irqpoll_weight = weight;
|
|
|
|
if (weight > 0)
|
|
irq_poll_init(&afu->irqpoll, weight, cxlflash_irqpoll);
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* mode_show() - presents the current mode of the device
|
|
* @dev: Generic device associated with the device.
|
|
* @attr: Device attribute representing the device mode.
|
|
* @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
|
|
*
|
|
* Return: The size of the ASCII string returned in @buf.
|
|
*/
|
|
static ssize_t mode_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(dev);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%s\n",
|
|
sdev->hostdata ? "superpipe" : "legacy");
|
|
}
|
|
|
|
/*
|
|
* Host attributes
|
|
*/
|
|
static DEVICE_ATTR_RO(port0);
|
|
static DEVICE_ATTR_RO(port1);
|
|
static DEVICE_ATTR_RO(port2);
|
|
static DEVICE_ATTR_RO(port3);
|
|
static DEVICE_ATTR_RW(lun_mode);
|
|
static DEVICE_ATTR_RO(ioctl_version);
|
|
static DEVICE_ATTR_RO(port0_lun_table);
|
|
static DEVICE_ATTR_RO(port1_lun_table);
|
|
static DEVICE_ATTR_RO(port2_lun_table);
|
|
static DEVICE_ATTR_RO(port3_lun_table);
|
|
static DEVICE_ATTR_RW(irqpoll_weight);
|
|
|
|
static struct device_attribute *cxlflash_host_attrs[] = {
|
|
&dev_attr_port0,
|
|
&dev_attr_port1,
|
|
&dev_attr_port2,
|
|
&dev_attr_port3,
|
|
&dev_attr_lun_mode,
|
|
&dev_attr_ioctl_version,
|
|
&dev_attr_port0_lun_table,
|
|
&dev_attr_port1_lun_table,
|
|
&dev_attr_port2_lun_table,
|
|
&dev_attr_port3_lun_table,
|
|
&dev_attr_irqpoll_weight,
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* Device attributes
|
|
*/
|
|
static DEVICE_ATTR_RO(mode);
|
|
|
|
static struct device_attribute *cxlflash_dev_attrs[] = {
|
|
&dev_attr_mode,
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* Host template
|
|
*/
|
|
static struct scsi_host_template driver_template = {
|
|
.module = THIS_MODULE,
|
|
.name = CXLFLASH_ADAPTER_NAME,
|
|
.info = cxlflash_driver_info,
|
|
.ioctl = cxlflash_ioctl,
|
|
.proc_name = CXLFLASH_NAME,
|
|
.queuecommand = cxlflash_queuecommand,
|
|
.eh_device_reset_handler = cxlflash_eh_device_reset_handler,
|
|
.eh_host_reset_handler = cxlflash_eh_host_reset_handler,
|
|
.change_queue_depth = cxlflash_change_queue_depth,
|
|
.cmd_per_lun = CXLFLASH_MAX_CMDS_PER_LUN,
|
|
.can_queue = CXLFLASH_MAX_CMDS,
|
|
.cmd_size = sizeof(struct afu_cmd) + __alignof__(struct afu_cmd) - 1,
|
|
.this_id = -1,
|
|
.sg_tablesize = 1, /* No scatter gather support */
|
|
.max_sectors = CXLFLASH_MAX_SECTORS,
|
|
.use_clustering = ENABLE_CLUSTERING,
|
|
.shost_attrs = cxlflash_host_attrs,
|
|
.sdev_attrs = cxlflash_dev_attrs,
|
|
};
|
|
|
|
/*
|
|
* Device dependent values
|
|
*/
|
|
static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS,
|
|
0ULL };
|
|
static struct dev_dependent_vals dev_flash_gt_vals = { CXLFLASH_MAX_SECTORS,
|
|
CXLFLASH_NOTIFY_SHUTDOWN };
|
|
static struct dev_dependent_vals dev_briard_vals = { CXLFLASH_MAX_SECTORS,
|
|
CXLFLASH_NOTIFY_SHUTDOWN };
|
|
|
|
/*
|
|
* PCI device binding table
|
|
*/
|
|
static struct pci_device_id cxlflash_pci_table[] = {
|
|
{PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA,
|
|
PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals},
|
|
{PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_FLASH_GT,
|
|
PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_flash_gt_vals},
|
|
{PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_BRIARD,
|
|
PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_briard_vals},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, cxlflash_pci_table);
|
|
|
|
/**
|
|
* cxlflash_worker_thread() - work thread handler for the AFU
|
|
* @work: Work structure contained within cxlflash associated with host.
|
|
*
|
|
* Handles the following events:
|
|
* - Link reset which cannot be performed on interrupt context due to
|
|
* blocking up to a few seconds
|
|
* - Rescan the host
|
|
*/
|
|
static void cxlflash_worker_thread(struct work_struct *work)
|
|
{
|
|
struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg,
|
|
work_q);
|
|
struct afu *afu = cfg->afu;
|
|
struct device *dev = &cfg->dev->dev;
|
|
__be64 __iomem *fc_port_regs;
|
|
int port;
|
|
ulong lock_flags;
|
|
|
|
/* Avoid MMIO if the device has failed */
|
|
|
|
if (cfg->state != STATE_NORMAL)
|
|
return;
|
|
|
|
spin_lock_irqsave(cfg->host->host_lock, lock_flags);
|
|
|
|
if (cfg->lr_state == LINK_RESET_REQUIRED) {
|
|
port = cfg->lr_port;
|
|
if (port < 0)
|
|
dev_err(dev, "%s: invalid port index %d\n",
|
|
__func__, port);
|
|
else {
|
|
spin_unlock_irqrestore(cfg->host->host_lock,
|
|
lock_flags);
|
|
|
|
/* The reset can block... */
|
|
fc_port_regs = get_fc_port_regs(cfg, port);
|
|
afu_link_reset(afu, port, fc_port_regs);
|
|
spin_lock_irqsave(cfg->host->host_lock, lock_flags);
|
|
}
|
|
|
|
cfg->lr_state = LINK_RESET_COMPLETE;
|
|
}
|
|
|
|
spin_unlock_irqrestore(cfg->host->host_lock, lock_flags);
|
|
|
|
if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0)
|
|
scsi_scan_host(cfg->host);
|
|
}
|
|
|
|
/**
|
|
* cxlflash_probe() - PCI entry point to add host
|
|
* @pdev: PCI device associated with the host.
|
|
* @dev_id: PCI device id associated with device.
|
|
*
|
|
* The device will initially start out in a 'probing' state and
|
|
* transition to the 'normal' state at the end of a successful
|
|
* probe. Should an EEH event occur during probe, the notification
|
|
* thread (error_detected()) will wait until the probe handler
|
|
* is nearly complete. At that time, the device will be moved to
|
|
* a 'probed' state and the EEH thread woken up to drive the slot
|
|
* reset and recovery (device moves to 'normal' state). Meanwhile,
|
|
* the probe will be allowed to exit successfully.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int cxlflash_probe(struct pci_dev *pdev,
|
|
const struct pci_device_id *dev_id)
|
|
{
|
|
struct Scsi_Host *host;
|
|
struct cxlflash_cfg *cfg = NULL;
|
|
struct device *dev = &pdev->dev;
|
|
struct dev_dependent_vals *ddv;
|
|
int rc = 0;
|
|
int k;
|
|
|
|
dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n",
|
|
__func__, pdev->irq);
|
|
|
|
ddv = (struct dev_dependent_vals *)dev_id->driver_data;
|
|
driver_template.max_sectors = ddv->max_sectors;
|
|
|
|
host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg));
|
|
if (!host) {
|
|
dev_err(dev, "%s: scsi_host_alloc failed\n", __func__);
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS;
|
|
host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET;
|
|
host->unique_id = host->host_no;
|
|
host->max_cmd_len = CXLFLASH_MAX_CDB_LEN;
|
|
|
|
cfg = shost_priv(host);
|
|
cfg->host = host;
|
|
rc = alloc_mem(cfg);
|
|
if (rc) {
|
|
dev_err(dev, "%s: alloc_mem failed\n", __func__);
|
|
rc = -ENOMEM;
|
|
scsi_host_put(cfg->host);
|
|
goto out;
|
|
}
|
|
|
|
cfg->init_state = INIT_STATE_NONE;
|
|
cfg->dev = pdev;
|
|
cfg->cxl_fops = cxlflash_cxl_fops;
|
|
|
|
/*
|
|
* Promoted LUNs move to the top of the LUN table. The rest stay on
|
|
* the bottom half. The bottom half grows from the end (index = 255),
|
|
* whereas the top half grows from the beginning (index = 0).
|
|
*
|
|
* Initialize the last LUN index for all possible ports.
|
|
*/
|
|
cfg->promote_lun_index = 0;
|
|
|
|
for (k = 0; k < MAX_FC_PORTS; k++)
|
|
cfg->last_lun_index[k] = CXLFLASH_NUM_VLUNS/2 - 1;
|
|
|
|
cfg->dev_id = (struct pci_device_id *)dev_id;
|
|
|
|
init_waitqueue_head(&cfg->tmf_waitq);
|
|
init_waitqueue_head(&cfg->reset_waitq);
|
|
|
|
INIT_WORK(&cfg->work_q, cxlflash_worker_thread);
|
|
cfg->lr_state = LINK_RESET_INVALID;
|
|
cfg->lr_port = -1;
|
|
spin_lock_init(&cfg->tmf_slock);
|
|
mutex_init(&cfg->ctx_tbl_list_mutex);
|
|
mutex_init(&cfg->ctx_recovery_mutex);
|
|
init_rwsem(&cfg->ioctl_rwsem);
|
|
INIT_LIST_HEAD(&cfg->ctx_err_recovery);
|
|
INIT_LIST_HEAD(&cfg->lluns);
|
|
|
|
pci_set_drvdata(pdev, cfg);
|
|
|
|
cfg->cxl_afu = cxl_pci_to_afu(pdev);
|
|
|
|
rc = init_pci(cfg);
|
|
if (rc) {
|
|
dev_err(dev, "%s: init_pci failed rc=%d\n", __func__, rc);
|
|
goto out_remove;
|
|
}
|
|
cfg->init_state = INIT_STATE_PCI;
|
|
|
|
rc = init_afu(cfg);
|
|
if (rc && !wq_has_sleeper(&cfg->reset_waitq)) {
|
|
dev_err(dev, "%s: init_afu failed rc=%d\n", __func__, rc);
|
|
goto out_remove;
|
|
}
|
|
cfg->init_state = INIT_STATE_AFU;
|
|
|
|
rc = init_scsi(cfg);
|
|
if (rc) {
|
|
dev_err(dev, "%s: init_scsi failed rc=%d\n", __func__, rc);
|
|
goto out_remove;
|
|
}
|
|
cfg->init_state = INIT_STATE_SCSI;
|
|
|
|
if (wq_has_sleeper(&cfg->reset_waitq)) {
|
|
cfg->state = STATE_PROBED;
|
|
wake_up_all(&cfg->reset_waitq);
|
|
} else
|
|
cfg->state = STATE_NORMAL;
|
|
out:
|
|
dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
|
|
return rc;
|
|
|
|
out_remove:
|
|
cxlflash_remove(pdev);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_pci_error_detected() - called when a PCI error is detected
|
|
* @pdev: PCI device struct.
|
|
* @state: PCI channel state.
|
|
*
|
|
* When an EEH occurs during an active reset, wait until the reset is
|
|
* complete and then take action based upon the device state.
|
|
*
|
|
* Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
|
|
*/
|
|
static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev,
|
|
pci_channel_state_t state)
|
|
{
|
|
int rc = 0;
|
|
struct cxlflash_cfg *cfg = pci_get_drvdata(pdev);
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state);
|
|
|
|
switch (state) {
|
|
case pci_channel_io_frozen:
|
|
wait_event(cfg->reset_waitq, cfg->state != STATE_RESET &&
|
|
cfg->state != STATE_PROBING);
|
|
if (cfg->state == STATE_FAILTERM)
|
|
return PCI_ERS_RESULT_DISCONNECT;
|
|
|
|
cfg->state = STATE_RESET;
|
|
scsi_block_requests(cfg->host);
|
|
drain_ioctls(cfg);
|
|
rc = cxlflash_mark_contexts_error(cfg);
|
|
if (unlikely(rc))
|
|
dev_err(dev, "%s: Failed to mark user contexts rc=%d\n",
|
|
__func__, rc);
|
|
term_afu(cfg);
|
|
return PCI_ERS_RESULT_NEED_RESET;
|
|
case pci_channel_io_perm_failure:
|
|
cfg->state = STATE_FAILTERM;
|
|
wake_up_all(&cfg->reset_waitq);
|
|
scsi_unblock_requests(cfg->host);
|
|
return PCI_ERS_RESULT_DISCONNECT;
|
|
default:
|
|
break;
|
|
}
|
|
return PCI_ERS_RESULT_NEED_RESET;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_pci_slot_reset() - called when PCI slot has been reset
|
|
* @pdev: PCI device struct.
|
|
*
|
|
* This routine is called by the pci error recovery code after the PCI
|
|
* slot has been reset, just before we should resume normal operations.
|
|
*
|
|
* Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
|
|
*/
|
|
static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev)
|
|
{
|
|
int rc = 0;
|
|
struct cxlflash_cfg *cfg = pci_get_drvdata(pdev);
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev);
|
|
|
|
rc = init_afu(cfg);
|
|
if (unlikely(rc)) {
|
|
dev_err(dev, "%s: EEH recovery failed rc=%d\n", __func__, rc);
|
|
return PCI_ERS_RESULT_DISCONNECT;
|
|
}
|
|
|
|
return PCI_ERS_RESULT_RECOVERED;
|
|
}
|
|
|
|
/**
|
|
* cxlflash_pci_resume() - called when normal operation can resume
|
|
* @pdev: PCI device struct
|
|
*/
|
|
static void cxlflash_pci_resume(struct pci_dev *pdev)
|
|
{
|
|
struct cxlflash_cfg *cfg = pci_get_drvdata(pdev);
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev);
|
|
|
|
cfg->state = STATE_NORMAL;
|
|
wake_up_all(&cfg->reset_waitq);
|
|
scsi_unblock_requests(cfg->host);
|
|
}
|
|
|
|
static const struct pci_error_handlers cxlflash_err_handler = {
|
|
.error_detected = cxlflash_pci_error_detected,
|
|
.slot_reset = cxlflash_pci_slot_reset,
|
|
.resume = cxlflash_pci_resume,
|
|
};
|
|
|
|
/*
|
|
* PCI device structure
|
|
*/
|
|
static struct pci_driver cxlflash_driver = {
|
|
.name = CXLFLASH_NAME,
|
|
.id_table = cxlflash_pci_table,
|
|
.probe = cxlflash_probe,
|
|
.remove = cxlflash_remove,
|
|
.shutdown = cxlflash_remove,
|
|
.err_handler = &cxlflash_err_handler,
|
|
};
|
|
|
|
/**
|
|
* init_cxlflash() - module entry point
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int __init init_cxlflash(void)
|
|
{
|
|
check_sizes();
|
|
cxlflash_list_init();
|
|
|
|
return pci_register_driver(&cxlflash_driver);
|
|
}
|
|
|
|
/**
|
|
* exit_cxlflash() - module exit point
|
|
*/
|
|
static void __exit exit_cxlflash(void)
|
|
{
|
|
cxlflash_term_global_luns();
|
|
cxlflash_free_errpage();
|
|
|
|
pci_unregister_driver(&cxlflash_driver);
|
|
}
|
|
|
|
module_init(init_cxlflash);
|
|
module_exit(exit_cxlflash);
|