2015-06-10 05:15:52 +07:00
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/*
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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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2015-08-14 09:47:43 +07:00
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#include <uapi/scsi/cxlflash_ioctl.h>
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2015-06-10 05:15:52 +07:00
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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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* cxlflash_cmd_checkout() - checks out an AFU command
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* @afu: AFU to checkout from.
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*
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* Commands are checked out in a round-robin fashion. Note that since
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* the command pool is larger than the hardware queue, the majority of
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* times we will only loop once or twice before getting a command. The
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* buffer and CDB within the command are initialized (zeroed) prior to
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* returning.
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*
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* Return: The checked out command or NULL when command pool is empty.
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*/
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struct afu_cmd *cxlflash_cmd_checkout(struct afu *afu)
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{
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int k, dec = CXLFLASH_NUM_CMDS;
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struct afu_cmd *cmd;
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while (dec--) {
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k = (afu->cmd_couts++ & (CXLFLASH_NUM_CMDS - 1));
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cmd = &afu->cmd[k];
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if (!atomic_dec_if_positive(&cmd->free)) {
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pr_debug("%s: returning found index=%d\n",
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__func__, cmd->slot);
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memset(cmd->buf, 0, CMD_BUFSIZE);
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memset(cmd->rcb.cdb, 0, sizeof(cmd->rcb.cdb));
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return cmd;
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}
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}
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return NULL;
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}
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/**
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* cxlflash_cmd_checkin() - checks in an AFU command
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* @cmd: AFU command to checkin.
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*
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* Safe to pass commands that have already been checked in. Several
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* internal tracking fields are reset as part of the checkin. Note
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* that these are intentionally reset prior to toggling the free bit
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* to avoid clobbering values in the event that the command is checked
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* out right away.
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*/
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void cxlflash_cmd_checkin(struct afu_cmd *cmd)
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{
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cmd->rcb.scp = NULL;
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cmd->rcb.timeout = 0;
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cmd->sa.ioasc = 0;
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cmd->cmd_tmf = false;
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cmd->sa.host_use[0] = 0; /* clears both completion and retry bytes */
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if (unlikely(atomic_inc_return(&cmd->free) != 1)) {
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pr_err("%s: Freeing cmd (%d) that is not in use!\n",
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__func__, cmd->slot);
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return;
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}
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pr_debug("%s: released cmd %p index=%d\n", __func__, cmd, cmd->slot);
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}
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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 sisl_ioarcb *ioarcb;
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struct sisl_ioasa *ioasa;
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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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pr_debug("%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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if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) {
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pr_debug("%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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pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d "
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"afu_extra=0x%X, scsi_entra=0x%X, fc_extra=0x%X\n",
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__func__, ioasa->rc.afu_rc, ioasa->rc.scsi_rc,
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ioasa->rc.fc_rc, ioasa->afu_extra, ioasa->scsi_extra,
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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. We will
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* attempt a retry to see if that resolves it.
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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_MEDIUM_ERROR << 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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* (rcb.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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u32 resid;
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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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bool cmd_is_tmf;
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spin_lock_irqsave(&cmd->slock, lock_flags);
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cmd->sa.host_use_b[0] |= B_DONE;
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spin_unlock_irqrestore(&cmd->slock, lock_flags);
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if (cmd->rcb.scp) {
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scp = cmd->rcb.scp;
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if (unlikely(cmd->sa.rc.afu_rc ||
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cmd->sa.rc.scsi_rc ||
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cmd->sa.rc.fc_rc))
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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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resid = cmd->sa.resid;
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cmd_is_tmf = cmd->cmd_tmf;
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cxlflash_cmd_checkin(cmd); /* Don't use cmd after here */
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pr_debug("%s: calling scsi_set_resid, scp=%p "
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"result=%X resid=%d\n", __func__,
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scp, scp->result, resid);
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scsi_set_resid(scp, resid);
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scsi_dma_unmap(scp);
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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_waitq.lock, 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_waitq.lock,
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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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* 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
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* SCSI_MLQUEUE_HOST_BUSY when host is busy
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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 afu_cmd *cmd;
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u32 port_sel = scp->device->channel + 1;
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short lflag = 0;
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struct Scsi_Host *host = scp->device->host;
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struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata;
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ulong lock_flags;
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int rc = 0;
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cmd = cxlflash_cmd_checkout(afu);
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if (unlikely(!cmd)) {
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pr_err("%s: could not get a free command\n", __func__);
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rc = SCSI_MLQUEUE_HOST_BUSY;
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goto out;
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}
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/* If a Task Management Function is active, do not send one more.
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*/
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spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
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if (cfg->tmf_active)
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wait_event_interruptible_locked_irq(cfg->tmf_waitq,
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!cfg->tmf_active);
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cfg->tmf_active = true;
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cmd->cmd_tmf = true;
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spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
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cmd->rcb.ctx_id = afu->ctx_hndl;
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cmd->rcb.port_sel = port_sel;
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cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
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lflag = SISL_REQ_FLAGS_TMF_CMD;
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cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID |
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SISL_REQ_FLAGS_SUP_UNDERRUN | lflag);
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/* Stash the scp in the reserved field, for reuse during interrupt */
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cmd->rcb.scp = scp;
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/* Copy the CDB from the cmd passed in */
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memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd));
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/* Send the command */
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rc = cxlflash_send_cmd(afu, cmd);
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if (unlikely(rc)) {
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cxlflash_cmd_checkin(cmd);
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spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
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cfg->tmf_active = false;
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spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
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goto out;
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}
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spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
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wait_event_interruptible_locked_irq(cfg->tmf_waitq, !cfg->tmf_active);
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spin_unlock_irqrestore(&cfg->tmf_waitq.lock, 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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* 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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* 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:
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* 0 on success
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* SCSI_MLQUEUE_HOST_BUSY when host is busy
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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 = (struct cxlflash_cfg *)host->hostdata;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
struct pci_dev *pdev = cfg->dev;
|
2015-08-14 09:47:34 +07:00
|
|
|
struct device *dev = &cfg->dev->dev;
|
2015-06-10 05:15:52 +07:00
|
|
|
struct afu_cmd *cmd;
|
|
|
|
u32 port_sel = scp->device->channel + 1;
|
|
|
|
int nseg, i, ncount;
|
|
|
|
struct scatterlist *sg;
|
|
|
|
ulong lock_flags;
|
|
|
|
short lflag = 0;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
pr_debug("%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]));
|
|
|
|
|
|
|
|
/* If a Task Management Function is active, wait for it to complete
|
|
|
|
* before continuing with regular commands.
|
|
|
|
*/
|
|
|
|
spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
|
|
|
|
if (cfg->tmf_active) {
|
|
|
|
spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
|
|
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
|
|
|
|
|
2015-08-14 09:47:34 +07:00
|
|
|
switch (cfg->state) {
|
|
|
|
case STATE_LIMBO:
|
|
|
|
dev_dbg_ratelimited(dev, "%s: device in limbo!\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;
|
|
|
|
}
|
|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
cmd = cxlflash_cmd_checkout(afu);
|
|
|
|
if (unlikely(!cmd)) {
|
|
|
|
pr_err("%s: could not get a free command\n", __func__);
|
|
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
cmd->rcb.ctx_id = afu->ctx_hndl;
|
|
|
|
cmd->rcb.port_sel = port_sel;
|
|
|
|
cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
|
|
|
|
|
|
|
|
if (scp->sc_data_direction == DMA_TO_DEVICE)
|
|
|
|
lflag = SISL_REQ_FLAGS_HOST_WRITE;
|
|
|
|
else
|
|
|
|
lflag = SISL_REQ_FLAGS_HOST_READ;
|
|
|
|
|
|
|
|
cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID |
|
|
|
|
SISL_REQ_FLAGS_SUP_UNDERRUN | lflag);
|
|
|
|
|
|
|
|
/* Stash the scp in the reserved field, for reuse during interrupt */
|
|
|
|
cmd->rcb.scp = scp;
|
|
|
|
|
|
|
|
nseg = scsi_dma_map(scp);
|
|
|
|
if (unlikely(nseg < 0)) {
|
|
|
|
dev_err(&pdev->dev, "%s: Fail DMA map! nseg=%d\n",
|
|
|
|
__func__, nseg);
|
|
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
ncount = scsi_sg_count(scp);
|
|
|
|
scsi_for_each_sg(scp, sg, ncount, i) {
|
|
|
|
cmd->rcb.data_len = sg_dma_len(sg);
|
|
|
|
cmd->rcb.data_ea = sg_dma_address(sg);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Copy the CDB from the scsi_cmnd passed in */
|
|
|
|
memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb));
|
|
|
|
|
|
|
|
/* Send the command */
|
|
|
|
rc = cxlflash_send_cmd(afu, cmd);
|
|
|
|
if (unlikely(rc)) {
|
|
|
|
cxlflash_cmd_checkin(cmd);
|
|
|
|
scsi_dma_unmap(scp);
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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 = (struct cxlflash_cfg *)host->hostdata;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
int rcr = 0;
|
|
|
|
|
|
|
|
pr_debug("%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]));
|
|
|
|
|
2015-08-14 09:47:34 +07:00
|
|
|
switch (cfg->state) {
|
|
|
|
case STATE_NORMAL:
|
|
|
|
rcr = send_tmf(afu, scp, TMF_LUN_RESET);
|
|
|
|
if (unlikely(rcr))
|
|
|
|
rc = FAILED;
|
|
|
|
break;
|
|
|
|
case STATE_LIMBO:
|
|
|
|
wait_event(cfg->limbo_waitq, cfg->state != STATE_LIMBO);
|
|
|
|
if (cfg->state == STATE_NORMAL)
|
|
|
|
break;
|
|
|
|
/* fall through */
|
|
|
|
default:
|
2015-06-10 05:15:52 +07:00
|
|
|
rc = FAILED;
|
2015-08-14 09:47:34 +07:00
|
|
|
break;
|
|
|
|
}
|
2015-06-10 05:15:52 +07:00
|
|
|
|
|
|
|
pr_debug("%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.
|
|
|
|
*
|
|
|
|
* 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 = (struct cxlflash_cfg *)host->hostdata;
|
|
|
|
|
|
|
|
pr_debug("%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]));
|
|
|
|
|
2015-08-14 09:47:34 +07:00
|
|
|
switch (cfg->state) {
|
|
|
|
case STATE_NORMAL:
|
|
|
|
cfg->state = STATE_LIMBO;
|
|
|
|
scsi_block_requests(cfg->host);
|
2015-08-14 09:47:43 +07:00
|
|
|
cxlflash_mark_contexts_error(cfg);
|
2015-08-14 09:47:34 +07:00
|
|
|
rcr = cxlflash_afu_reset(cfg);
|
|
|
|
if (rcr) {
|
|
|
|
rc = FAILED;
|
|
|
|
cfg->state = STATE_FAILTERM;
|
|
|
|
} else
|
|
|
|
cfg->state = STATE_NORMAL;
|
|
|
|
wake_up_all(&cfg->limbo_waitq);
|
|
|
|
scsi_unblock_requests(cfg->host);
|
|
|
|
break;
|
|
|
|
case STATE_LIMBO:
|
|
|
|
wait_event(cfg->limbo_waitq, cfg->state != STATE_LIMBO);
|
|
|
|
if (cfg->state == STATE_NORMAL)
|
|
|
|
break;
|
|
|
|
/* fall through */
|
|
|
|
default:
|
2015-06-10 05:15:52 +07:00
|
|
|
rc = FAILED;
|
2015-08-14 09:47:34 +07:00
|
|
|
break;
|
|
|
|
}
|
2015-06-10 05:15:52 +07:00
|
|
|
|
|
|
|
pr_debug("%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
|
|
|
|
* @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 cxlflash_show_port_status(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct Scsi_Host *shost = class_to_shost(dev);
|
|
|
|
struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
|
|
|
|
char *disp_status;
|
|
|
|
int rc;
|
|
|
|
u32 port;
|
|
|
|
u64 status;
|
|
|
|
u64 *fc_regs;
|
|
|
|
|
|
|
|
rc = kstrtouint((attr->attr.name + 4), 10, &port);
|
|
|
|
if (rc || (port > NUM_FC_PORTS))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
fc_regs = &afu->afu_map->global.fc_regs[port][0];
|
|
|
|
status =
|
|
|
|
(readq_be(&fc_regs[FC_MTIP_STATUS / 8]) & 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 snprintf(buf, PAGE_SIZE, "%s\n", disp_status);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_show_lun_mode() - 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 cxlflash_show_lun_mode(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
struct Scsi_Host *shost = class_to_shost(dev);
|
|
|
|
struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_store_lun_mode() - 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 cxlflash_store_lun_mode(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 = (struct cxlflash_cfg *)shost->hostdata;
|
|
|
|
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;
|
|
|
|
cxlflash_afu_reset(cfg);
|
|
|
|
scsi_scan_host(cfg->host);
|
|
|
|
}
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2015-08-14 09:47:43 +07:00
|
|
|
/**
|
|
|
|
* cxlflash_show_ioctl_version() - 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 cxlflash_show_ioctl_version(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n", DK_CXLFLASH_VERSION_0);
|
|
|
|
}
|
|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
/**
|
|
|
|
* cxlflash_show_dev_mode() - 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 cxlflash_show_dev_mode(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
struct scsi_device *sdev = to_scsi_device(dev);
|
|
|
|
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%s\n",
|
|
|
|
sdev->hostdata ? "superpipe" : "legacy");
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
|
|
|
|
* @cxlflash: 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))
|
2015-08-14 09:47:34 +07:00
|
|
|
wait_event_timeout(cfg->limbo_waitq,
|
2015-06-10 05:15:52 +07:00
|
|
|
!pci_channel_offline(pdev),
|
|
|
|
CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Host attributes
|
|
|
|
*/
|
|
|
|
static DEVICE_ATTR(port0, S_IRUGO, cxlflash_show_port_status, NULL);
|
|
|
|
static DEVICE_ATTR(port1, S_IRUGO, cxlflash_show_port_status, NULL);
|
|
|
|
static DEVICE_ATTR(lun_mode, S_IRUGO | S_IWUSR, cxlflash_show_lun_mode,
|
|
|
|
cxlflash_store_lun_mode);
|
2015-08-14 09:47:43 +07:00
|
|
|
static DEVICE_ATTR(ioctl_version, S_IRUGO, cxlflash_show_ioctl_version, NULL);
|
2015-06-10 05:15:52 +07:00
|
|
|
|
|
|
|
static struct device_attribute *cxlflash_host_attrs[] = {
|
|
|
|
&dev_attr_port0,
|
|
|
|
&dev_attr_port1,
|
|
|
|
&dev_attr_lun_mode,
|
2015-08-14 09:47:43 +07:00
|
|
|
&dev_attr_ioctl_version,
|
2015-06-10 05:15:52 +07:00
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Device attributes
|
|
|
|
*/
|
|
|
|
static DEVICE_ATTR(mode, S_IRUGO, cxlflash_show_dev_mode, NULL);
|
|
|
|
|
|
|
|
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,
|
2015-08-14 09:47:43 +07:00
|
|
|
.ioctl = cxlflash_ioctl,
|
2015-06-10 05:15:52 +07:00
|
|
|
.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 = 16,
|
|
|
|
.can_queue = CXLFLASH_MAX_CMDS,
|
|
|
|
.this_id = -1,
|
|
|
|
.sg_tablesize = SG_NONE, /* 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 };
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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},
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(pci, cxlflash_pci_table);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* free_mem() - free memory associated with the AFU
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*/
|
|
|
|
static void free_mem(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
char *buf = NULL;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
|
|
|
|
if (cfg->afu) {
|
|
|
|
for (i = 0; i < CXLFLASH_NUM_CMDS; i++) {
|
|
|
|
buf = afu->cmd[i].buf;
|
|
|
|
if (!((u64)buf & (PAGE_SIZE - 1)))
|
|
|
|
free_page((ulong)buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
free_pages((ulong)afu, get_order(sizeof(struct afu)));
|
|
|
|
cfg->afu = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* stop_afu() - stops the AFU command timers and unmaps the MMIO space
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*
|
|
|
|
* Safe to call with AFU in a partially allocated/initialized state.
|
|
|
|
*/
|
|
|
|
static void stop_afu(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
|
|
|
|
if (likely(afu)) {
|
|
|
|
for (i = 0; i < CXLFLASH_NUM_CMDS; i++)
|
|
|
|
complete(&afu->cmd[i].cevent);
|
|
|
|
|
|
|
|
if (likely(afu->afu_map)) {
|
|
|
|
cxl_psa_unmap((void *)afu->afu_map);
|
|
|
|
afu->afu_map = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* term_mc() - terminates the master context
|
|
|
|
* @cxlflash: 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, enum undo_level level)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
|
|
|
|
if (!afu || !cfg->mcctx) {
|
|
|
|
pr_err("%s: returning from term_mc with NULL afu or MC\n",
|
|
|
|
__func__);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (level) {
|
|
|
|
case UNDO_START:
|
|
|
|
rc = cxl_stop_context(cfg->mcctx);
|
|
|
|
BUG_ON(rc);
|
|
|
|
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);
|
|
|
|
case RELEASE_CONTEXT:
|
|
|
|
cfg->mcctx = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* term_afu() - terminates the AFU
|
|
|
|
* @cxlflash: 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)
|
|
|
|
{
|
|
|
|
term_mc(cfg, UNDO_START);
|
|
|
|
|
|
|
|
if (cfg->afu)
|
|
|
|
stop_afu(cfg);
|
|
|
|
|
|
|
|
pr_debug("%s: returning\n", __func__);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
static void cxlflash_remove(struct pci_dev *pdev)
|
|
|
|
{
|
|
|
|
struct cxlflash_cfg *cfg = pci_get_drvdata(pdev);
|
|
|
|
ulong lock_flags;
|
|
|
|
|
|
|
|
/* If a Task Management Function is active, wait for it to complete
|
|
|
|
* before continuing with remove.
|
|
|
|
*/
|
|
|
|
spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
|
|
|
|
if (cfg->tmf_active)
|
|
|
|
wait_event_interruptible_locked_irq(cfg->tmf_waitq,
|
|
|
|
!cfg->tmf_active);
|
|
|
|
spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
|
|
|
|
|
2015-08-14 09:47:34 +07:00
|
|
|
cfg->state = STATE_FAILTERM;
|
2015-08-14 09:47:43 +07:00
|
|
|
cxlflash_stop_term_user_contexts(cfg);
|
2015-08-14 09:47:34 +07:00
|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
switch (cfg->init_state) {
|
|
|
|
case INIT_STATE_SCSI:
|
2015-08-14 09:47:43 +07:00
|
|
|
cxlflash_term_local_luns(cfg);
|
2015-06-10 05:15:52 +07:00
|
|
|
scsi_remove_host(cfg->host);
|
|
|
|
scsi_host_put(cfg->host);
|
|
|
|
/* Fall through */
|
|
|
|
case INIT_STATE_AFU:
|
|
|
|
term_afu(cfg);
|
|
|
|
case INIT_STATE_PCI:
|
|
|
|
pci_release_regions(cfg->dev);
|
|
|
|
pci_disable_device(pdev);
|
|
|
|
case INIT_STATE_NONE:
|
|
|
|
flush_work(&cfg->work_q);
|
|
|
|
free_mem(cfg);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
pr_debug("%s: returning\n", __func__);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* alloc_mem() - allocates the AFU and its command pool
|
|
|
|
* @cxlflash: 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;
|
|
|
|
int i;
|
|
|
|
char *buf = NULL;
|
|
|
|
|
|
|
|
/* This allocation is about 12K, i.e. only 1 64k page
|
|
|
|
* and upto 4 4k pages
|
|
|
|
*/
|
|
|
|
cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
|
|
|
get_order(sizeof(struct afu)));
|
|
|
|
if (unlikely(!cfg->afu)) {
|
|
|
|
pr_err("%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;
|
|
|
|
|
|
|
|
for (i = 0; i < CXLFLASH_NUM_CMDS; buf += CMD_BUFSIZE, i++) {
|
|
|
|
if (!((u64)buf & (PAGE_SIZE - 1))) {
|
|
|
|
buf = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
|
|
|
|
if (unlikely(!buf)) {
|
|
|
|
pr_err("%s: Allocate command buffers fail!\n",
|
|
|
|
__func__);
|
|
|
|
rc = -ENOMEM;
|
|
|
|
free_mem(cfg);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
cfg->afu->cmd[i].buf = buf;
|
|
|
|
atomic_set(&cfg->afu->cmd[i].free, 1);
|
|
|
|
cfg->afu->cmd[i].slot = i;
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* init_pci() - initializes the host as a PCI device
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*
|
|
|
|
* Return:
|
|
|
|
* 0 on success
|
|
|
|
* -EIO on unable to communicate with device
|
|
|
|
* A return code from the PCI sub-routines
|
|
|
|
*/
|
|
|
|
static int init_pci(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
struct pci_dev *pdev = cfg->dev;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
cfg->cxlflash_regs_pci = pci_resource_start(pdev, 0);
|
|
|
|
rc = pci_request_regions(pdev, CXLFLASH_NAME);
|
|
|
|
if (rc < 0) {
|
|
|
|
dev_err(&pdev->dev,
|
|
|
|
"%s: Couldn't register memory range of registers\n",
|
|
|
|
__func__);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
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(&pdev->dev, "%s: Cannot enable adapter\n",
|
|
|
|
__func__);
|
|
|
|
cxlflash_wait_for_pci_err_recovery(cfg);
|
|
|
|
goto out_release_regions;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
|
|
|
|
if (rc < 0) {
|
|
|
|
dev_dbg(&pdev->dev, "%s: Failed to set 64 bit PCI DMA mask\n",
|
|
|
|
__func__);
|
|
|
|
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
|
|
|
|
}
|
|
|
|
|
|
|
|
if (rc < 0) {
|
|
|
|
dev_err(&pdev->dev, "%s: Failed to set PCI DMA mask\n",
|
|
|
|
__func__);
|
|
|
|
goto out_disable;
|
|
|
|
}
|
|
|
|
|
|
|
|
pci_set_master(pdev);
|
|
|
|
|
|
|
|
if (pci_channel_offline(pdev)) {
|
|
|
|
cxlflash_wait_for_pci_err_recovery(cfg);
|
|
|
|
if (pci_channel_offline(pdev)) {
|
|
|
|
rc = -EIO;
|
|
|
|
goto out_msi_disable;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = pci_save_state(pdev);
|
|
|
|
|
|
|
|
if (rc != PCIBIOS_SUCCESSFUL) {
|
|
|
|
dev_err(&pdev->dev, "%s: Failed to save PCI config space\n",
|
|
|
|
__func__);
|
|
|
|
rc = -EIO;
|
|
|
|
goto cleanup_nolog;
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
cleanup_nolog:
|
|
|
|
out_msi_disable:
|
|
|
|
cxlflash_wait_for_pci_err_recovery(cfg);
|
|
|
|
out_disable:
|
|
|
|
pci_disable_device(pdev);
|
|
|
|
out_release_regions:
|
|
|
|
pci_release_regions(pdev);
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* init_scsi() - adds the host to the SCSI stack and kicks off host scan
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*
|
|
|
|
* Return:
|
|
|
|
* 0 on success
|
|
|
|
* A return code from adding the host
|
|
|
|
*/
|
|
|
|
static int init_scsi(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
struct pci_dev *pdev = cfg->dev;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
rc = scsi_add_host(cfg->host, &pdev->dev);
|
|
|
|
if (rc) {
|
|
|
|
dev_err(&pdev->dev, "%s: scsi_add_host failed (rc=%d)\n",
|
|
|
|
__func__, rc);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
scsi_scan_host(cfg->host);
|
|
|
|
|
|
|
|
out:
|
|
|
|
pr_debug("%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(u64 *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(u64 *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
|
|
|
|
* -EINVAL when @delay_us is less than 1000
|
|
|
|
*/
|
|
|
|
static int wait_port_online(u64 *fc_regs, u32 delay_us, u32 nretry)
|
|
|
|
{
|
|
|
|
u64 status;
|
|
|
|
|
|
|
|
if (delay_us < 1000) {
|
|
|
|
pr_err("%s: invalid delay specified %d\n", __func__, delay_us);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
do {
|
|
|
|
msleep(delay_us / 1000);
|
|
|
|
status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]);
|
|
|
|
} 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
|
|
|
|
* -EINVAL when @delay_us is less than 1000
|
|
|
|
*/
|
|
|
|
static int wait_port_offline(u64 *fc_regs, u32 delay_us, u32 nretry)
|
|
|
|
{
|
|
|
|
u64 status;
|
|
|
|
|
|
|
|
if (delay_us < 1000) {
|
|
|
|
pr_err("%s: invalid delay specified %d\n", __func__, delay_us);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
do {
|
|
|
|
msleep(delay_us / 1000);
|
|
|
|
status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]);
|
|
|
|
} 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.
|
|
|
|
*
|
|
|
|
* Return:
|
|
|
|
* 0 when the WWPN is successfully written and the port comes back online
|
|
|
|
* -1 when the port fails to go offline or come back up online
|
|
|
|
*/
|
|
|
|
static int afu_set_wwpn(struct afu *afu, int port, u64 *fc_regs, u64 wwpn)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
set_port_offline(fc_regs);
|
|
|
|
|
|
|
|
if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US,
|
|
|
|
FC_PORT_STATUS_RETRY_CNT)) {
|
|
|
|
pr_debug("%s: wait on port %d to go offline timed out\n",
|
|
|
|
__func__, port);
|
|
|
|
ret = -1; /* but continue on to leave the port back online */
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ret == 0)
|
|
|
|
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)) {
|
|
|
|
pr_debug("%s: wait on port %d to go online timed out\n",
|
|
|
|
__func__, port);
|
|
|
|
ret = -1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Override for internal lun!!!
|
|
|
|
*/
|
|
|
|
if (afu->internal_lun) {
|
|
|
|
pr_debug("%s: Overriding port %d online timeout!!!\n",
|
|
|
|
__func__, port);
|
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, ret);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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, u64 *fc_regs)
|
|
|
|
{
|
|
|
|
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 &= ~(1 << 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))
|
|
|
|
pr_err("%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))
|
|
|
|
pr_err("%s: wait on port %d to go online timed out\n",
|
|
|
|
__func__, port);
|
|
|
|
|
|
|
|
/* switch back to include this port */
|
|
|
|
port_sel |= (1 << port);
|
|
|
|
writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel);
|
|
|
|
cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC);
|
|
|
|
|
|
|
|
pr_debug("%s: returning port_sel=%lld\n", __func__, port_sel);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Asynchronous interrupt information table
|
|
|
|
*/
|
|
|
|
static const struct asyc_intr_info ainfo[] = {
|
|
|
|
{SISL_ASTATUS_FC0_OTHER, "other error", 0, CLR_FC_ERROR | LINK_RESET},
|
|
|
|
{SISL_ASTATUS_FC0_LOGO, "target initiated LOGO", 0, 0},
|
|
|
|
{SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET},
|
|
|
|
{SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, 0},
|
|
|
|
{SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR},
|
|
|
|
{SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, 0},
|
|
|
|
{SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0},
|
|
|
|
{SISL_ASTATUS_FC0_LINK_UP, "link up", 0, 0},
|
|
|
|
{SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET},
|
|
|
|
{SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0},
|
|
|
|
{SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET},
|
|
|
|
{SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, 0},
|
|
|
|
{SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR},
|
|
|
|
{SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, 0},
|
|
|
|
{SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0},
|
|
|
|
{SISL_ASTATUS_FC1_LINK_UP, "link up", 1, 0},
|
|
|
|
{0x0, "", 0, 0} /* terminator */
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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;
|
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
|
|
|
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 */
|
|
|
|
reg = readq_be(&afu->afu_map->global.fc_regs[0][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, &afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]);
|
|
|
|
|
|
|
|
/* now clear FC errors */
|
|
|
|
for (i = 0; i < NUM_FC_PORTS; i++) {
|
|
|
|
writeq_be(0xFFFFFFFFU,
|
|
|
|
&afu->afu_map->global.fc_regs[i][FC_ERROR / 8]);
|
|
|
|
writeq_be(0, &afu->afu_map->global.fc_regs[i][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;
|
|
|
|
u64 reg;
|
|
|
|
u64 reg_unmasked;
|
|
|
|
|
|
|
|
reg = readq_be(&afu->host_map->intr_status);
|
|
|
|
reg_unmasked = (reg & SISL_ISTATUS_UNMASK);
|
|
|
|
|
|
|
|
if (reg_unmasked == 0UL) {
|
|
|
|
pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n",
|
|
|
|
__func__, (u64)afu, reg);
|
|
|
|
goto cxlflash_sync_err_irq_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n",
|
|
|
|
__func__, (u64)afu, reg);
|
|
|
|
|
|
|
|
writeq_be(reg_unmasked, &afu->host_map->intr_clear);
|
|
|
|
|
|
|
|
cxlflash_sync_err_irq_exit:
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, IRQ_HANDLED);
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
|
|
|
|
* @irq: Interrupt number.
|
|
|
|
* @data: Private data provided at interrupt registration, the AFU.
|
|
|
|
*
|
|
|
|
* Return: Always return IRQ_HANDLED.
|
|
|
|
*/
|
|
|
|
static irqreturn_t cxlflash_rrq_irq(int irq, void *data)
|
|
|
|
{
|
|
|
|
struct afu *afu = (struct afu *)data;
|
|
|
|
struct afu_cmd *cmd;
|
|
|
|
bool toggle = afu->toggle;
|
|
|
|
u64 entry,
|
|
|
|
*hrrq_start = afu->hrrq_start,
|
|
|
|
*hrrq_end = afu->hrrq_end,
|
|
|
|
*hrrq_curr = afu->hrrq_curr;
|
|
|
|
|
|
|
|
/* Process however many RRQ entries that are ready */
|
|
|
|
while (true) {
|
|
|
|
entry = *hrrq_curr;
|
|
|
|
|
|
|
|
if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle)
|
|
|
|
break;
|
|
|
|
|
|
|
|
cmd = (struct afu_cmd *)(entry & ~SISL_RESP_HANDLE_T_BIT);
|
|
|
|
cmd_complete(cmd);
|
|
|
|
|
|
|
|
/* 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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
afu->hrrq_curr = hrrq_curr;
|
|
|
|
afu->toggle = toggle;
|
|
|
|
|
|
|
|
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;
|
|
|
|
u64 reg_unmasked;
|
|
|
|
const struct asyc_intr_info *info;
|
|
|
|
struct sisl_global_map *global = &afu->afu_map->global;
|
|
|
|
u64 reg;
|
|
|
|
u8 port;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
cfg = afu->parent;
|
|
|
|
|
|
|
|
reg = readq_be(&global->regs.aintr_status);
|
|
|
|
reg_unmasked = (reg & SISL_ASTATUS_UNMASK);
|
|
|
|
|
|
|
|
if (reg_unmasked == 0) {
|
|
|
|
pr_err("%s: spurious interrupt, aintr_status 0x%016llX\n",
|
|
|
|
__func__, reg);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* it is OK 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) || !info)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
port = info->port;
|
|
|
|
|
|
|
|
pr_err("%s: FC Port %d -> %s, fc_status 0x%08llX\n",
|
|
|
|
__func__, port, info->desc,
|
|
|
|
readq_be(&global->fc_regs[port][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) {
|
|
|
|
pr_err("%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(&global->fc_regs[port][FC_ERROR / 8]);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* since all errors are unmasked, FC_ERROR and FC_ERRCAP
|
|
|
|
* should be the same and tracing one is sufficient.
|
|
|
|
*/
|
|
|
|
|
|
|
|
pr_err("%s: fc %d: clearing fc_error 0x%08llX\n",
|
|
|
|
__func__, port, reg);
|
|
|
|
|
|
|
|
writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]);
|
|
|
|
writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
pr_debug("%s: returning rc=%d, afu=%p\n", __func__, IRQ_HANDLED, afu);
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* start_context() - starts the master context
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*
|
|
|
|
* Return: A success or failure value from CXL services.
|
|
|
|
*/
|
|
|
|
static int start_context(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
rc = cxl_start_context(cfg->mcctx,
|
|
|
|
cfg->afu->work.work_element_descriptor,
|
|
|
|
NULL);
|
|
|
|
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* read_vpd() - obtains the WWPNs from VPD
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
* @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs
|
|
|
|
*
|
|
|
|
* Return:
|
|
|
|
* 0 on success
|
|
|
|
* -ENODEV when VPD or WWPN keywords not found
|
|
|
|
*/
|
|
|
|
static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[])
|
|
|
|
{
|
|
|
|
struct pci_dev *dev = cfg->parent_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[NUM_FC_PORTS] = { "V5", "V6" };
|
|
|
|
|
|
|
|
/* Get the VPD data from the device */
|
|
|
|
vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data);
|
|
|
|
if (unlikely(vpd_size <= 0)) {
|
|
|
|
pr_err("%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)) {
|
|
|
|
pr_err("%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)) {
|
|
|
|
pr_debug("%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 < 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)) {
|
|
|
|
pr_err("%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))) {
|
|
|
|
pr_err("%s: Port %d WWPN incomplete or VPD corrupt\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)) {
|
|
|
|
pr_err("%s: Fail to convert port %d WWPN to integer\n",
|
|
|
|
__func__, k);
|
|
|
|
rc = -ENODEV;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_context_reset() - timeout handler for AFU commands
|
|
|
|
* @cmd: AFU command that timed out.
|
|
|
|
*
|
|
|
|
* Sends a reset to the AFU.
|
|
|
|
*/
|
|
|
|
void cxlflash_context_reset(struct afu_cmd *cmd)
|
|
|
|
{
|
|
|
|
int nretry = 0;
|
|
|
|
u64 rrin = 0x1;
|
|
|
|
u64 room = 0;
|
|
|
|
struct afu *afu = cmd->parent;
|
|
|
|
ulong lock_flags;
|
|
|
|
|
|
|
|
pr_debug("%s: cmd=%p\n", __func__, cmd);
|
|
|
|
|
|
|
|
spin_lock_irqsave(&cmd->slock, lock_flags);
|
|
|
|
|
|
|
|
/* Already completed? */
|
|
|
|
if (cmd->sa.host_use_b[0] & B_DONE) {
|
|
|
|
spin_unlock_irqrestore(&cmd->slock, lock_flags);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
cmd->sa.host_use_b[0] |= (B_DONE | B_ERROR | B_TIMEOUT);
|
|
|
|
spin_unlock_irqrestore(&cmd->slock, lock_flags);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We really want to send this reset at all costs, so spread
|
|
|
|
* out wait time on successive retries for available room.
|
|
|
|
*/
|
|
|
|
do {
|
|
|
|
room = readq_be(&afu->host_map->cmd_room);
|
|
|
|
atomic64_set(&afu->room, room);
|
|
|
|
if (room)
|
|
|
|
goto write_rrin;
|
|
|
|
udelay(nretry);
|
|
|
|
} while (nretry++ < MC_ROOM_RETRY_CNT);
|
|
|
|
|
|
|
|
pr_err("%s: no cmd_room to send reset\n", __func__);
|
|
|
|
return;
|
|
|
|
|
|
|
|
write_rrin:
|
|
|
|
nretry = 0;
|
|
|
|
writeq_be(rrin, &afu->host_map->ioarrin);
|
|
|
|
do {
|
|
|
|
rrin = readq_be(&afu->host_map->ioarrin);
|
|
|
|
if (rrin != 0x1)
|
|
|
|
break;
|
|
|
|
/* Double delay each time */
|
|
|
|
udelay(2 ^ nretry);
|
|
|
|
} while (nretry++ < MC_ROOM_RETRY_CNT);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* init_pcr() - initialize the provisioning and control registers
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*
|
|
|
|
* Also sets up fast access to the mapped registers and initializes AFU
|
|
|
|
* command fields that never change.
|
|
|
|
*/
|
|
|
|
void init_pcr(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
struct sisl_ctrl_map *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);
|
|
|
|
/* ctx_hndl is 16 bits in CAIA */
|
|
|
|
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);
|
|
|
|
|
|
|
|
/* initialize cmd fields that never change */
|
|
|
|
for (i = 0; i < CXLFLASH_NUM_CMDS; i++) {
|
|
|
|
afu->cmd[i].rcb.ctx_id = afu->ctx_hndl;
|
|
|
|
afu->cmd[i].rcb.msi = SISL_MSI_RRQ_UPDATED;
|
|
|
|
afu->cmd[i].rcb.rrq = 0x0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* init_global() - initialize AFU global registers
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*/
|
|
|
|
int init_global(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
u64 wwpn[NUM_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) {
|
|
|
|
pr_err("%s: could not read vpd rc=%d\n", __func__, rc);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__, wwpn[0], wwpn[1]);
|
|
|
|
|
|
|
|
/* set up RRQ 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);
|
|
|
|
|
|
|
|
/* 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 = NUM_FC_PORTS - 1;
|
|
|
|
} else {
|
|
|
|
writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel);
|
|
|
|
num_ports = NUM_FC_PORTS;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < num_ports; i++) {
|
|
|
|
/* unmask all errors (but they are still masked at AFU) */
|
|
|
|
writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRMSK / 8]);
|
|
|
|
/* clear CRC error cnt & set a threshold */
|
|
|
|
(void)readq_be(&afu->afu_map->global.
|
|
|
|
fc_regs[i][FC_CNT_CRCERR / 8]);
|
|
|
|
writeq_be(MC_CRC_THRESH, &afu->afu_map->global.fc_regs[i]
|
|
|
|
[FC_CRC_THRESH / 8]);
|
|
|
|
|
|
|
|
/* set WWPNs. If already programmed, wwpn[i] is 0 */
|
|
|
|
if (wwpn[i] != 0 &&
|
|
|
|
afu_set_wwpn(afu, i,
|
|
|
|
&afu->afu_map->global.fc_regs[i][0],
|
|
|
|
wwpn[i])) {
|
|
|
|
pr_err("%s: failed to set WWPN on port %d\n",
|
|
|
|
__func__, i);
|
|
|
|
rc = -EIO;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
/* 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 */
|
|
|
|
/* tbls, 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);
|
|
|
|
/* init heartbeat */
|
|
|
|
afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb);
|
|
|
|
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* start_afu() - initializes and starts the AFU
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*/
|
|
|
|
static int start_afu(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
struct afu_cmd *cmd;
|
|
|
|
|
|
|
|
int i = 0;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
for (i = 0; i < CXLFLASH_NUM_CMDS; i++) {
|
|
|
|
cmd = &afu->cmd[i];
|
|
|
|
|
|
|
|
init_completion(&cmd->cevent);
|
|
|
|
spin_lock_init(&cmd->slock);
|
|
|
|
cmd->parent = afu;
|
|
|
|
}
|
|
|
|
|
|
|
|
init_pcr(cfg);
|
|
|
|
|
|
|
|
/* initialize RRQ pointers */
|
|
|
|
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;
|
|
|
|
|
|
|
|
rc = init_global(cfg);
|
|
|
|
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* init_mc() - create and register as the master context
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*
|
|
|
|
* Return:
|
|
|
|
* 0 on success
|
|
|
|
* -ENOMEM when unable to obtain a context from CXL services
|
|
|
|
* A failure value from CXL services.
|
|
|
|
*/
|
|
|
|
static int init_mc(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
struct cxl_context *ctx;
|
|
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
int rc = 0;
|
|
|
|
enum undo_level level;
|
|
|
|
|
|
|
|
ctx = cxl_get_context(cfg->dev);
|
|
|
|
if (unlikely(!ctx))
|
|
|
|
return -ENOMEM;
|
|
|
|
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: initial AFU reset failed rc=%d\n",
|
|
|
|
__func__, rc);
|
|
|
|
level = RELEASE_CONTEXT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = cxl_allocate_afu_irqs(ctx, 3);
|
|
|
|
if (unlikely(rc)) {
|
|
|
|
dev_err(dev, "%s: call to allocate_afu_irqs failed rc=%d!\n",
|
|
|
|
__func__, rc);
|
|
|
|
level = RELEASE_CONTEXT;
|
|
|
|
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: IRQ 1 (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: IRQ 2 (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: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n",
|
|
|
|
__func__);
|
|
|
|
level = UNMAP_TWO;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
/* 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:
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
out:
|
|
|
|
term_mc(cfg, level);
|
|
|
|
goto ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* init_afu() - setup as master context and start AFU
|
|
|
|
* @cxlflash: 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
|
|
|
|
* -ENOMEM when unable to map the AFU MMIO space
|
|
|
|
* A failure value from internal services.
|
|
|
|
*/
|
|
|
|
static int init_afu(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
u64 reg;
|
|
|
|
int rc = 0;
|
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
struct device *dev = &cfg->dev->dev;
|
|
|
|
|
2015-08-14 09:47:34 +07:00
|
|
|
cxl_perst_reloads_same_image(cfg->cxl_afu, true);
|
|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
rc = init_mc(cfg);
|
|
|
|
if (rc) {
|
|
|
|
dev_err(dev, "%s: call to init_mc failed, rc=%d!\n",
|
|
|
|
__func__, rc);
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Map the entire MMIO space of the AFU.
|
|
|
|
*/
|
|
|
|
afu->afu_map = cxl_psa_map(cfg->mcctx);
|
|
|
|
if (!afu->afu_map) {
|
|
|
|
rc = -ENOMEM;
|
|
|
|
term_mc(cfg, UNDO_START);
|
|
|
|
dev_err(dev, "%s: call to cxl_psa_map failed!\n", __func__);
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* don't byte reverse on reading afu_version, else the string form */
|
|
|
|
/* will be backwards */
|
|
|
|
reg = afu->afu_map->global.regs.afu_version;
|
|
|
|
memcpy(afu->version, ®, 8);
|
|
|
|
afu->interface_version =
|
|
|
|
readq_be(&afu->afu_map->global.regs.interface_version);
|
|
|
|
pr_debug("%s: afu version %s, interface version 0x%llX\n",
|
|
|
|
__func__, afu->version, afu->interface_version);
|
|
|
|
|
|
|
|
rc = start_afu(cfg);
|
|
|
|
if (rc) {
|
|
|
|
dev_err(dev, "%s: call to start_afu failed, rc=%d!\n",
|
|
|
|
__func__, rc);
|
|
|
|
term_mc(cfg, UNDO_START);
|
|
|
|
cxl_psa_unmap((void *)afu->afu_map);
|
|
|
|
afu->afu_map = NULL;
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
|
|
|
afu_err_intr_init(cfg->afu);
|
|
|
|
atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room));
|
|
|
|
|
|
|
|
err1:
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_send_cmd() - sends an AFU command
|
|
|
|
* @afu: AFU associated with the host.
|
|
|
|
* @cmd: AFU command to send.
|
|
|
|
*
|
|
|
|
* Return:
|
|
|
|
* 0 on success
|
|
|
|
* -1 on failure
|
|
|
|
*/
|
|
|
|
int cxlflash_send_cmd(struct afu *afu, struct afu_cmd *cmd)
|
|
|
|
{
|
|
|
|
struct cxlflash_cfg *cfg = afu->parent;
|
|
|
|
int nretry = 0;
|
|
|
|
int rc = 0;
|
|
|
|
u64 room;
|
|
|
|
long newval;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine is used by critical users such an AFU sync and to
|
|
|
|
* send a task management function (TMF). Thus we want to retry a
|
|
|
|
* bit before returning an error. To avoid the performance penalty
|
|
|
|
* of MMIO, we spread the update of 'room' over multiple commands.
|
|
|
|
*/
|
|
|
|
retry:
|
|
|
|
newval = atomic64_dec_if_positive(&afu->room);
|
|
|
|
if (!newval) {
|
|
|
|
do {
|
|
|
|
room = readq_be(&afu->host_map->cmd_room);
|
|
|
|
atomic64_set(&afu->room, room);
|
|
|
|
if (room)
|
|
|
|
goto write_ioarrin;
|
|
|
|
udelay(nretry);
|
|
|
|
} while (nretry++ < MC_ROOM_RETRY_CNT);
|
|
|
|
|
|
|
|
pr_err("%s: no cmd_room to send 0x%X\n",
|
|
|
|
__func__, cmd->rcb.cdb[0]);
|
|
|
|
|
|
|
|
goto no_room;
|
|
|
|
} else if (unlikely(newval < 0)) {
|
|
|
|
/* This should be rare. i.e. Only if two threads race and
|
|
|
|
* decrement before the MMIO read is done. In this case
|
|
|
|
* just benefit from the other thread having updated
|
|
|
|
* afu->room.
|
|
|
|
*/
|
|
|
|
if (nretry++ < MC_ROOM_RETRY_CNT) {
|
|
|
|
udelay(nretry);
|
|
|
|
goto retry;
|
|
|
|
}
|
|
|
|
|
|
|
|
goto no_room;
|
|
|
|
}
|
|
|
|
|
|
|
|
write_ioarrin:
|
|
|
|
writeq_be((u64)&cmd->rcb, &afu->host_map->ioarrin);
|
|
|
|
out:
|
|
|
|
pr_debug("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__, cmd,
|
|
|
|
cmd->rcb.data_len, (void *)cmd->rcb.data_ea, rc);
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
no_room:
|
|
|
|
afu->read_room = true;
|
|
|
|
schedule_work(&cfg->work_q);
|
|
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_wait_resp() - polls for a response or timeout to a sent AFU command
|
|
|
|
* @afu: AFU associated with the host.
|
|
|
|
* @cmd: AFU command that was sent.
|
|
|
|
*/
|
|
|
|
void cxlflash_wait_resp(struct afu *afu, struct afu_cmd *cmd)
|
|
|
|
{
|
|
|
|
ulong timeout = jiffies + (cmd->rcb.timeout * 2 * HZ);
|
|
|
|
|
|
|
|
timeout = wait_for_completion_timeout(&cmd->cevent, timeout);
|
|
|
|
if (!timeout)
|
|
|
|
cxlflash_context_reset(cmd);
|
|
|
|
|
|
|
|
if (unlikely(cmd->sa.ioasc != 0))
|
|
|
|
pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, "
|
|
|
|
"scsi_rc 0x%X, fc_rc 0x%X\n", __func__, cmd->rcb.cdb[0],
|
|
|
|
cmd->sa.rc.flags, cmd->sa.rc.afu_rc, cmd->sa.rc.scsi_rc,
|
|
|
|
cmd->sa.rc.fc_rc);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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 exlusive 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.
|
|
|
|
*
|
2015-08-14 09:47:34 +07:00
|
|
|
* 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).
|
|
|
|
*
|
2015-06-10 05:15:52 +07:00
|
|
|
* 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)
|
|
|
|
{
|
2015-08-14 09:47:34 +07:00
|
|
|
struct cxlflash_cfg *cfg = afu->parent;
|
2015-06-10 05:15:52 +07:00
|
|
|
struct afu_cmd *cmd = NULL;
|
|
|
|
int rc = 0;
|
|
|
|
int retry_cnt = 0;
|
|
|
|
static DEFINE_MUTEX(sync_active);
|
|
|
|
|
2015-08-14 09:47:34 +07:00
|
|
|
if (cfg->state != STATE_NORMAL) {
|
|
|
|
pr_debug("%s: Sync not required! (%u)\n", __func__, cfg->state);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
mutex_lock(&sync_active);
|
|
|
|
retry:
|
|
|
|
cmd = cxlflash_cmd_checkout(afu);
|
|
|
|
if (unlikely(!cmd)) {
|
|
|
|
retry_cnt++;
|
|
|
|
udelay(1000 * retry_cnt);
|
|
|
|
if (retry_cnt < MC_RETRY_CNT)
|
|
|
|
goto retry;
|
|
|
|
pr_err("%s: could not get a free command\n", __func__);
|
|
|
|
rc = -1;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
pr_debug("%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u);
|
|
|
|
|
|
|
|
memset(cmd->rcb.cdb, 0, sizeof(cmd->rcb.cdb));
|
|
|
|
|
|
|
|
cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD;
|
|
|
|
cmd->rcb.port_sel = 0x0; /* NA */
|
|
|
|
cmd->rcb.lun_id = 0x0; /* NA */
|
|
|
|
cmd->rcb.data_len = 0x0;
|
|
|
|
cmd->rcb.data_ea = 0x0;
|
|
|
|
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 */
|
|
|
|
*((u16 *)&cmd->rcb.cdb[2]) = swab16(ctx_hndl_u);
|
|
|
|
*((u32 *)&cmd->rcb.cdb[4]) = swab32(res_hndl_u);
|
|
|
|
|
|
|
|
rc = cxlflash_send_cmd(afu, cmd);
|
|
|
|
if (unlikely(rc))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
cxlflash_wait_resp(afu, cmd);
|
|
|
|
|
|
|
|
/* set on timeout */
|
|
|
|
if (unlikely((cmd->sa.ioasc != 0) ||
|
|
|
|
(cmd->sa.host_use_b[0] & B_ERROR)))
|
|
|
|
rc = -1;
|
|
|
|
out:
|
|
|
|
mutex_unlock(&sync_active);
|
|
|
|
if (cmd)
|
|
|
|
cxlflash_cmd_checkin(cmd);
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_afu_reset() - resets the AFU
|
|
|
|
* @cxlflash: Internal structure associated with the host.
|
|
|
|
*
|
|
|
|
* Return:
|
|
|
|
* 0 on success
|
|
|
|
* A failure value from internal services.
|
|
|
|
*/
|
|
|
|
int cxlflash_afu_reset(struct cxlflash_cfg *cfg)
|
|
|
|
{
|
|
|
|
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);
|
|
|
|
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
* - Read AFU command room
|
|
|
|
*/
|
|
|
|
static void cxlflash_worker_thread(struct work_struct *work)
|
|
|
|
{
|
2015-08-14 09:47:34 +07:00
|
|
|
struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg,
|
|
|
|
work_q);
|
2015-06-10 05:15:52 +07:00
|
|
|
struct afu *afu = cfg->afu;
|
|
|
|
int port;
|
|
|
|
ulong lock_flags;
|
|
|
|
|
2015-08-14 09:47:34 +07:00
|
|
|
/* Avoid MMIO if the device has failed */
|
|
|
|
|
|
|
|
if (cfg->state != STATE_NORMAL)
|
|
|
|
return;
|
|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
spin_lock_irqsave(cfg->host->host_lock, lock_flags);
|
|
|
|
|
|
|
|
if (cfg->lr_state == LINK_RESET_REQUIRED) {
|
|
|
|
port = cfg->lr_port;
|
|
|
|
if (port < 0)
|
|
|
|
pr_err("%s: invalid port index %d\n", __func__, port);
|
|
|
|
else {
|
|
|
|
spin_unlock_irqrestore(cfg->host->host_lock,
|
|
|
|
lock_flags);
|
|
|
|
|
|
|
|
/* The reset can block... */
|
|
|
|
afu_link_reset(afu, port,
|
|
|
|
&afu->afu_map->
|
|
|
|
global.fc_regs[port][0]);
|
|
|
|
spin_lock_irqsave(cfg->host->host_lock, lock_flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
cfg->lr_state = LINK_RESET_COMPLETE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (afu->read_room) {
|
|
|
|
atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room));
|
|
|
|
afu->read_room = false;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(cfg->host->host_lock, lock_flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* cxlflash_probe() - PCI entry point to add host
|
|
|
|
* @pdev: PCI device associated with the host.
|
|
|
|
* @dev_id: PCI device id associated with device.
|
|
|
|
*
|
|
|
|
* Return: 0 on success / non-zero 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 *phys_dev;
|
|
|
|
struct dev_dependent_vals *ddv;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
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(&pdev->dev, "%s: call to 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->max_channel = NUM_FC_PORTS - 1;
|
|
|
|
host->unique_id = host->host_no;
|
|
|
|
host->max_cmd_len = CXLFLASH_MAX_CDB_LEN;
|
|
|
|
|
|
|
|
cfg = (struct cxlflash_cfg *)host->hostdata;
|
|
|
|
cfg->host = host;
|
|
|
|
rc = alloc_mem(cfg);
|
|
|
|
if (rc) {
|
|
|
|
dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n",
|
|
|
|
__func__);
|
|
|
|
rc = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
cfg->init_state = INIT_STATE_NONE;
|
|
|
|
cfg->dev = pdev;
|
|
|
|
cfg->dev_id = (struct pci_device_id *)dev_id;
|
|
|
|
cfg->mcctx = NULL;
|
|
|
|
|
|
|
|
init_waitqueue_head(&cfg->tmf_waitq);
|
2015-08-14 09:47:34 +07:00
|
|
|
init_waitqueue_head(&cfg->limbo_waitq);
|
2015-06-10 05:15:52 +07:00
|
|
|
|
|
|
|
INIT_WORK(&cfg->work_q, cxlflash_worker_thread);
|
|
|
|
cfg->lr_state = LINK_RESET_INVALID;
|
|
|
|
cfg->lr_port = -1;
|
2015-08-14 09:47:43 +07:00
|
|
|
mutex_init(&cfg->ctx_tbl_list_mutex);
|
|
|
|
mutex_init(&cfg->ctx_recovery_mutex);
|
|
|
|
INIT_LIST_HEAD(&cfg->ctx_err_recovery);
|
|
|
|
INIT_LIST_HEAD(&cfg->lluns);
|
2015-06-10 05:15:52 +07:00
|
|
|
|
|
|
|
pci_set_drvdata(pdev, cfg);
|
|
|
|
|
|
|
|
/* Use the special service provided to look up the physical
|
|
|
|
* PCI device, since we are called on the probe of the virtual
|
|
|
|
* PCI host bus (vphb)
|
|
|
|
*/
|
|
|
|
phys_dev = cxl_get_phys_dev(pdev);
|
|
|
|
if (!dev_is_pci(phys_dev)) {
|
|
|
|
pr_err("%s: not a pci dev\n", __func__);
|
|
|
|
rc = -ENODEV;
|
|
|
|
goto out_remove;
|
|
|
|
}
|
|
|
|
cfg->parent_dev = to_pci_dev(phys_dev);
|
|
|
|
|
|
|
|
cfg->cxl_afu = cxl_pci_to_afu(pdev);
|
|
|
|
|
|
|
|
rc = init_pci(cfg);
|
|
|
|
if (rc) {
|
|
|
|
dev_err(&pdev->dev, "%s: call to init_pci "
|
|
|
|
"failed rc=%d!\n", __func__, rc);
|
|
|
|
goto out_remove;
|
|
|
|
}
|
|
|
|
cfg->init_state = INIT_STATE_PCI;
|
|
|
|
|
|
|
|
rc = init_afu(cfg);
|
|
|
|
if (rc) {
|
|
|
|
dev_err(&pdev->dev, "%s: call to 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(&pdev->dev, "%s: call to init_scsi "
|
|
|
|
"failed rc=%d!\n", __func__, rc);
|
|
|
|
goto out_remove;
|
|
|
|
}
|
|
|
|
cfg->init_state = INIT_STATE_SCSI;
|
|
|
|
|
|
|
|
out:
|
|
|
|
pr_debug("%s: returning rc=%d\n", __func__, rc);
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
out_remove:
|
|
|
|
cxlflash_remove(pdev);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2015-08-14 09:47:34 +07:00
|
|
|
/**
|
|
|
|
* cxlflash_pci_error_detected() - called when a PCI error is detected
|
|
|
|
* @pdev: PCI device struct.
|
|
|
|
* @state: PCI channel 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)
|
|
|
|
{
|
2015-08-14 09:47:43 +07:00
|
|
|
int rc = 0;
|
2015-08-14 09:47:34 +07:00
|
|
|
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:
|
|
|
|
cfg->state = STATE_LIMBO;
|
|
|
|
|
|
|
|
/* Turn off legacy I/O */
|
|
|
|
scsi_block_requests(cfg->host);
|
2015-08-14 09:47:43 +07:00
|
|
|
rc = cxlflash_mark_contexts_error(cfg);
|
|
|
|
if (unlikely(rc))
|
|
|
|
dev_err(dev, "%s: Failed to mark user contexts!(%d)\n",
|
|
|
|
__func__, rc);
|
2015-08-14 09:47:34 +07:00
|
|
|
term_mc(cfg, UNDO_START);
|
|
|
|
stop_afu(cfg);
|
|
|
|
|
|
|
|
return PCI_ERS_RESULT_NEED_RESET;
|
|
|
|
case pci_channel_io_perm_failure:
|
|
|
|
cfg->state = STATE_FAILTERM;
|
|
|
|
wake_up_all(&cfg->limbo_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! (%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->limbo_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,
|
|
|
|
};
|
|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
/*
|
|
|
|
* PCI device structure
|
|
|
|
*/
|
|
|
|
static struct pci_driver cxlflash_driver = {
|
|
|
|
.name = CXLFLASH_NAME,
|
|
|
|
.id_table = cxlflash_pci_table,
|
|
|
|
.probe = cxlflash_probe,
|
|
|
|
.remove = cxlflash_remove,
|
2015-08-14 09:47:34 +07:00
|
|
|
.err_handler = &cxlflash_err_handler,
|
2015-06-10 05:15:52 +07:00
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* init_cxlflash() - module entry point
|
|
|
|
*
|
|
|
|
* Return: 0 on success / non-zero on failure
|
|
|
|
*/
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|
|
|
static int __init init_cxlflash(void)
|
|
|
|
{
|
|
|
|
pr_info("%s: IBM Power CXL Flash Adapter: %s\n",
|
|
|
|
__func__, CXLFLASH_DRIVER_DATE);
|
|
|
|
|
2015-08-14 09:47:43 +07:00
|
|
|
cxlflash_list_init();
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|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
return pci_register_driver(&cxlflash_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* exit_cxlflash() - module exit point
|
|
|
|
*/
|
|
|
|
static void __exit exit_cxlflash(void)
|
|
|
|
{
|
2015-08-14 09:47:43 +07:00
|
|
|
cxlflash_term_global_luns();
|
|
|
|
cxlflash_free_errpage();
|
|
|
|
|
2015-06-10 05:15:52 +07:00
|
|
|
pci_unregister_driver(&cxlflash_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(init_cxlflash);
|
|
|
|
module_exit(exit_cxlflash);
|