diff options
Diffstat (limited to 'drivers/scsi/ibmvscsi/ibmvfc.c')
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvfc.c | 3910 |
1 files changed, 3910 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c new file mode 100644 index 000000000000..eb702b96d57c --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -0,0 +1,3910 @@ +/* + * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter + * + * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation + * + * Copyright (C) IBM Corporation, 2008 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/kthread.h> +#include <linux/of.h> +#include <linux/stringify.h> +#include <asm/firmware.h> +#include <asm/irq.h> +#include <asm/vio.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_transport_fc.h> +#include "ibmvfc.h" + +static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT; +static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT; +static unsigned int max_lun = IBMVFC_MAX_LUN; +static unsigned int max_targets = IBMVFC_MAX_TARGETS; +static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT; +static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS; +static unsigned int dev_loss_tmo = IBMVFC_DEV_LOSS_TMO; +static unsigned int ibmvfc_debug = IBMVFC_DEBUG; +static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL; +static LIST_HEAD(ibmvfc_head); +static DEFINE_SPINLOCK(ibmvfc_driver_lock); +static struct scsi_transport_template *ibmvfc_transport_template; + +MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver"); +MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(IBMVFC_DRIVER_VERSION); + +module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. " + "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]"); +module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(default_timeout, + "Default timeout in seconds for initialization and EH commands. " + "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]"); +module_param_named(max_requests, max_requests, uint, S_IRUGO); +MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. " + "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]"); +module_param_named(max_lun, max_lun, uint, S_IRUGO); +MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. " + "[Default=" __stringify(IBMVFC_MAX_LUN) "]"); +module_param_named(max_targets, max_targets, uint, S_IRUGO); +MODULE_PARM_DESC(max_targets, "Maximum allowed targets. " + "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]"); +module_param_named(disc_threads, disc_threads, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. " + "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]"); +module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "Enable driver debug information. " + "[Default=" __stringify(IBMVFC_DEBUG) "]"); +module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC " + "transport should insulate the loss of a remote port. Once this " + "value is exceeded, the scsi target is removed. " + "[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]"); +module_param_named(log_level, log_level, uint, 0); +MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. " + "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]"); + +static const struct { + u16 status; + u16 error; + u8 result; + u8 retry; + int log; + char *name; +} cmd_status [] = { + { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_NO_CONNECT, 1, 1, "network down" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 0, 0, "link halted" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" }, + + { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ABORT, 0, 1, "invalid parameter" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ABORT, 0, 1, "missing parameter" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ABORT, 0, 1, "transaction cancelled" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ABORT, 0, 1, "transaction cancelled implicit" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" }, + + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" }, + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" }, + { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" }, + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" }, + { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" }, + { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" }, + { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" }, + { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" }, + { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" }, + { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" }, + { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" }, + + { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" }, +}; + +static void ibmvfc_npiv_login(struct ibmvfc_host *); +static void ibmvfc_tgt_send_prli(struct ibmvfc_target *); +static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *); +static void ibmvfc_tgt_query_target(struct ibmvfc_target *); + +static const char *unknown_error = "unknown error"; + +#ifdef CONFIG_SCSI_IBMVFC_TRACE +/** + * ibmvfc_trc_start - Log a start trace entry + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_trc_start(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; + struct ibmvfc_mad_common *mad = &evt->iu.mad_common; + struct ibmvfc_trace_entry *entry; + + entry = &vhost->trace[vhost->trace_index++]; + entry->evt = evt; + entry->time = jiffies; + entry->fmt = evt->crq.format; + entry->type = IBMVFC_TRC_START; + + switch (entry->fmt) { + case IBMVFC_CMD_FORMAT: + entry->op_code = vfc_cmd->iu.cdb[0]; + entry->scsi_id = vfc_cmd->tgt_scsi_id; + entry->lun = scsilun_to_int(&vfc_cmd->iu.lun); + entry->tmf_flags = vfc_cmd->iu.tmf_flags; + entry->u.start.xfer_len = vfc_cmd->iu.xfer_len; + break; + case IBMVFC_MAD_FORMAT: + entry->op_code = mad->opcode; + break; + default: + break; + }; +} + +/** + * ibmvfc_trc_end - Log an end trace entry + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_trc_end(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; + struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common; + struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++]; + + entry->evt = evt; + entry->time = jiffies; + entry->fmt = evt->crq.format; + entry->type = IBMVFC_TRC_END; + + switch (entry->fmt) { + case IBMVFC_CMD_FORMAT: + entry->op_code = vfc_cmd->iu.cdb[0]; + entry->scsi_id = vfc_cmd->tgt_scsi_id; + entry->lun = scsilun_to_int(&vfc_cmd->iu.lun); + entry->tmf_flags = vfc_cmd->iu.tmf_flags; + entry->u.end.status = vfc_cmd->status; + entry->u.end.error = vfc_cmd->error; + entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags; + entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code; + entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status; + break; + case IBMVFC_MAD_FORMAT: + entry->op_code = mad->opcode; + entry->u.end.status = mad->status; + break; + default: + break; + + }; +} + +#else +#define ibmvfc_trc_start(evt) do { } while (0) +#define ibmvfc_trc_end(evt) do { } while (0) +#endif + +/** + * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response + * @status: status / error class + * @error: error + * + * Return value: + * index into cmd_status / -EINVAL on failure + **/ +static int ibmvfc_get_err_index(u16 status, u16 error) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(cmd_status); i++) + if ((cmd_status[i].status & status) == cmd_status[i].status && + cmd_status[i].error == error) + return i; + + return -EINVAL; +} + +/** + * ibmvfc_get_cmd_error - Find the error description for the fcp response + * @status: status / error class + * @error: error + * + * Return value: + * error description string + **/ +static const char *ibmvfc_get_cmd_error(u16 status, u16 error) +{ + int rc = ibmvfc_get_err_index(status, error); + if (rc >= 0) + return cmd_status[rc].name; + return unknown_error; +} + +/** + * ibmvfc_get_err_result - Find the scsi status to return for the fcp response + * @vfc_cmd: ibmvfc command struct + * + * Return value: + * SCSI result value to return for completed command + **/ +static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd) +{ + int err; + struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; + int fc_rsp_len = rsp->fcp_rsp_len; + + if ((rsp->flags & FCP_RSP_LEN_VALID) && + ((!fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) || + rsp->data.info.rsp_code)) + return DID_ERROR << 16; + + if (!vfc_cmd->status) { + if (rsp->flags & FCP_RESID_OVER) + return rsp->scsi_status | (DID_ERROR << 16); + else + return rsp->scsi_status | (DID_OK << 16); + } + + err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error); + if (err >= 0) + return rsp->scsi_status | (cmd_status[err].result << 16); + return rsp->scsi_status | (DID_ERROR << 16); +} + +/** + * ibmvfc_retry_cmd - Determine if error status is retryable + * @status: status / error class + * @error: error + * + * Return value: + * 1 if error should be retried / 0 if it should not + **/ +static int ibmvfc_retry_cmd(u16 status, u16 error) +{ + int rc = ibmvfc_get_err_index(status, error); + + if (rc >= 0) + return cmd_status[rc].retry; + return 1; +} + +static const char *unknown_fc_explain = "unknown fc explain"; + +static const struct { + u16 fc_explain; + char *name; +} ls_explain [] = { + { 0x00, "no additional explanation" }, + { 0x01, "service parameter error - options" }, + { 0x03, "service parameter error - initiator control" }, + { 0x05, "service parameter error - recipient control" }, + { 0x07, "service parameter error - received data field size" }, + { 0x09, "service parameter error - concurrent seq" }, + { 0x0B, "service parameter error - credit" }, + { 0x0D, "invalid N_Port/F_Port_Name" }, + { 0x0E, "invalid node/Fabric Name" }, + { 0x0F, "invalid common service parameters" }, + { 0x11, "invalid association header" }, + { 0x13, "association header required" }, + { 0x15, "invalid originator S_ID" }, + { 0x17, "invalid OX_ID-RX-ID combination" }, + { 0x19, "command (request) already in progress" }, + { 0x1E, "N_Port Login requested" }, + { 0x1F, "Invalid N_Port_ID" }, +}; + +static const struct { + u16 fc_explain; + char *name; +} gs_explain [] = { + { 0x00, "no additional explanation" }, + { 0x01, "port identifier not registered" }, + { 0x02, "port name not registered" }, + { 0x03, "node name not registered" }, + { 0x04, "class of service not registered" }, + { 0x06, "initial process associator not registered" }, + { 0x07, "FC-4 TYPEs not registered" }, + { 0x08, "symbolic port name not registered" }, + { 0x09, "symbolic node name not registered" }, + { 0x0A, "port type not registered" }, + { 0xF0, "authorization exception" }, + { 0xF1, "authentication exception" }, + { 0xF2, "data base full" }, + { 0xF3, "data base empty" }, + { 0xF4, "processing request" }, + { 0xF5, "unable to verify connection" }, + { 0xF6, "devices not in a common zone" }, +}; + +/** + * ibmvfc_get_ls_explain - Return the FC Explain description text + * @status: FC Explain status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_ls_explain(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ls_explain); i++) + if (ls_explain[i].fc_explain == status) + return ls_explain[i].name; + + return unknown_fc_explain; +} + +/** + * ibmvfc_get_gs_explain - Return the FC Explain description text + * @status: FC Explain status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_gs_explain(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(gs_explain); i++) + if (gs_explain[i].fc_explain == status) + return gs_explain[i].name; + + return unknown_fc_explain; +} + +static const struct { + enum ibmvfc_fc_type fc_type; + char *name; +} fc_type [] = { + { IBMVFC_FABRIC_REJECT, "fabric reject" }, + { IBMVFC_PORT_REJECT, "port reject" }, + { IBMVFC_LS_REJECT, "ELS reject" }, + { IBMVFC_FABRIC_BUSY, "fabric busy" }, + { IBMVFC_PORT_BUSY, "port busy" }, + { IBMVFC_BASIC_REJECT, "basic reject" }, +}; + +static const char *unknown_fc_type = "unknown fc type"; + +/** + * ibmvfc_get_fc_type - Return the FC Type description text + * @status: FC Type error status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_fc_type(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(fc_type); i++) + if (fc_type[i].fc_type == status) + return fc_type[i].name; + + return unknown_fc_type; +} + +/** + * ibmvfc_set_tgt_action - Set the next init action for the target + * @tgt: ibmvfc target struct + * @action: action to perform + * + **/ +static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt, + enum ibmvfc_target_action action) +{ + switch (tgt->action) { + case IBMVFC_TGT_ACTION_DEL_RPORT: + break; + default: + tgt->action = action; + break; + } +} + +/** + * ibmvfc_set_host_state - Set the state for the host + * @vhost: ibmvfc host struct + * @state: state to set host to + * + * Returns: + * 0 if state changed / non-zero if not changed + **/ +static int ibmvfc_set_host_state(struct ibmvfc_host *vhost, + enum ibmvfc_host_state state) +{ + int rc = 0; + + switch (vhost->state) { + case IBMVFC_HOST_OFFLINE: + rc = -EINVAL; + break; + default: + vhost->state = state; + break; + }; + + return rc; +} + +/** + * ibmvfc_set_host_action - Set the next init action for the host + * @vhost: ibmvfc host struct + * @action: action to perform + * + **/ +static void ibmvfc_set_host_action(struct ibmvfc_host *vhost, + enum ibmvfc_host_action action) +{ + switch (action) { + case IBMVFC_HOST_ACTION_ALLOC_TGTS: + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_INIT_WAIT: + if (vhost->action == IBMVFC_HOST_ACTION_INIT) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_QUERY: + switch (vhost->action) { + case IBMVFC_HOST_ACTION_INIT_WAIT: + case IBMVFC_HOST_ACTION_NONE: + case IBMVFC_HOST_ACTION_TGT_ADD: + vhost->action = action; + break; + default: + break; + }; + break; + case IBMVFC_HOST_ACTION_TGT_INIT: + if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_INIT: + case IBMVFC_HOST_ACTION_TGT_DEL: + case IBMVFC_HOST_ACTION_QUERY_TGTS: + case IBMVFC_HOST_ACTION_TGT_ADD: + case IBMVFC_HOST_ACTION_NONE: + default: + vhost->action = action; + break; + }; +} + +/** + * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login) + * @vhost: ibmvfc host struct + * + * Return value: + * nothing + **/ +static void ibmvfc_reinit_host(struct ibmvfc_host *vhost) +{ + if (vhost->action == IBMVFC_HOST_ACTION_NONE) { + scsi_block_requests(vhost->host); + ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); + } else + vhost->reinit = 1; + + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_link_down - Handle a link down event from the adapter + * @vhost: ibmvfc host struct + * @state: ibmvfc host state to enter + * + **/ +static void ibmvfc_link_down(struct ibmvfc_host *vhost, + enum ibmvfc_host_state state) +{ + struct ibmvfc_target *tgt; + + ENTER; + scsi_block_requests(vhost->host); + list_for_each_entry(tgt, &vhost->targets, queue) + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + ibmvfc_set_host_state(vhost, state); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); + vhost->events_to_log |= IBMVFC_AE_LINKDOWN; + wake_up(&vhost->work_wait_q); + LEAVE; +} + +/** + * ibmvfc_init_host - Start host initialization + * @vhost: ibmvfc host struct + * + * Return value: + * nothing + **/ +static void ibmvfc_init_host(struct ibmvfc_host *vhost) +{ + struct ibmvfc_target *tgt; + + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { + if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) { + dev_err(vhost->dev, + "Host initialization retries exceeded. Taking adapter offline\n"); + ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); + return; + } + } + + if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { + list_for_each_entry(tgt, &vhost->targets, queue) + tgt->need_login = 1; + scsi_block_requests(vhost->host); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); + vhost->job_step = ibmvfc_npiv_login; + wake_up(&vhost->work_wait_q); + } +} + +/** + * ibmvfc_send_crq - Send a CRQ + * @vhost: ibmvfc host struct + * @word1: the first 64 bits of the data + * @word2: the second 64 bits of the data + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2) +{ + struct vio_dev *vdev = to_vio_dev(vhost->dev); + return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); +} + +/** + * ibmvfc_send_crq_init - Send a CRQ init message + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost) +{ + ibmvfc_dbg(vhost, "Sending CRQ init\n"); + return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0); +} + +/** + * ibmvfc_send_crq_init_complete - Send a CRQ init complete message + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost) +{ + ibmvfc_dbg(vhost, "Sending CRQ init complete\n"); + return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0); +} + +/** + * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ + * @vhost: ibmvfc host struct + * + * Frees irq, deallocates a page for messages, unmaps dma, and unregisters + * the crq with the hypervisor. + **/ +static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost) +{ + long rc; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + struct ibmvfc_crq_queue *crq = &vhost->crq; + + ibmvfc_dbg(vhost, "Releasing CRQ\n"); + free_irq(vdev->irq, vhost); + do { + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + vhost->state = IBMVFC_NO_CRQ; + dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); + free_page((unsigned long)crq->msgs); +} + +/** + * ibmvfc_reenable_crq_queue - reenables the CRQ + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost) +{ + int rc; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + + /* Re-enable the CRQ */ + do { + rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); + } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + if (rc) + dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc); + + return rc; +} + +/** + * ibmvfc_reset_crq - resets a crq after a failure + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_reset_crq(struct ibmvfc_host *vhost) +{ + int rc; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + struct ibmvfc_crq_queue *crq = &vhost->crq; + + /* Close the CRQ */ + do { + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + vhost->state = IBMVFC_NO_CRQ; + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); + + /* Clean out the queue */ + memset(crq->msgs, 0, PAGE_SIZE); + crq->cur = 0; + + /* And re-open it again */ + rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, + crq->msg_token, PAGE_SIZE); + + if (rc == H_CLOSED) + /* Adapter is good, but other end is not ready */ + dev_warn(vhost->dev, "Partner adapter not ready\n"); + else if (rc != 0) + dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc); + + return rc; +} + +/** + * ibmvfc_valid_event - Determines if event is valid. + * @pool: event_pool that contains the event + * @evt: ibmvfc event to be checked for validity + * + * Return value: + * 1 if event is valid / 0 if event is not valid + **/ +static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool, + struct ibmvfc_event *evt) +{ + int index = evt - pool->events; + if (index < 0 || index >= pool->size) /* outside of bounds */ + return 0; + if (evt != pool->events + index) /* unaligned */ + return 0; + return 1; +} + +/** + * ibmvfc_free_event - Free the specified event + * @evt: ibmvfc_event to be freed + * + **/ +static void ibmvfc_free_event(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_event_pool *pool = &vhost->pool; + + BUG_ON(!ibmvfc_valid_event(pool, evt)); + BUG_ON(atomic_inc_return(&evt->free) != 1); + list_add_tail(&evt->queue, &vhost->free); +} + +/** + * ibmvfc_scsi_eh_done - EH done function for queuecommand commands + * @evt: ibmvfc event struct + * + * This function does not setup any error status, that must be done + * before this function gets called. + **/ +static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt) +{ + struct scsi_cmnd *cmnd = evt->cmnd; + + if (cmnd) { + scsi_dma_unmap(cmnd); + cmnd->scsi_done(cmnd); + } + + ibmvfc_free_event(evt); +} + +/** + * ibmvfc_fail_request - Fail request with specified error code + * @evt: ibmvfc event struct + * @error_code: error code to fail request with + * + * Return value: + * none + **/ +static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code) +{ + if (evt->cmnd) { + evt->cmnd->result = (error_code << 16); + evt->done = ibmvfc_scsi_eh_done; + } else + evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED; + + list_del(&evt->queue); + del_timer(&evt->timer); + ibmvfc_trc_end(evt); + evt->done(evt); +} + +/** + * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests + * @vhost: ibmvfc host struct + * @error_code: error code to fail requests with + * + * Return value: + * none + **/ +static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code) +{ + struct ibmvfc_event *evt, *pos; + + ibmvfc_dbg(vhost, "Purging all requests\n"); + list_for_each_entry_safe(evt, pos, &vhost->sent, queue) + ibmvfc_fail_request(evt, error_code); +} + +/** + * __ibmvfc_reset_host - Reset the connection to the server (no locking) + * @vhost: struct ibmvfc host to reset + **/ +static void __ibmvfc_reset_host(struct ibmvfc_host *vhost) +{ + int rc; + + scsi_block_requests(vhost->host); + ibmvfc_purge_requests(vhost, DID_ERROR); + if ((rc = ibmvfc_reset_crq(vhost)) || + (rc = ibmvfc_send_crq_init(vhost)) || + (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) { + dev_err(vhost->dev, "Error after reset rc=%d\n", rc); + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + } else + ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); +} + +/** + * ibmvfc_reset_host - Reset the connection to the server + * @vhost: struct ibmvfc host to reset + **/ +static void ibmvfc_reset_host(struct ibmvfc_host *vhost) +{ + unsigned long flags; + + spin_lock_irqsave(vhost->host->host_lock, flags); + __ibmvfc_reset_host(vhost); + spin_unlock_irqrestore(vhost->host->host_lock, flags); +} + +/** + * ibmvfc_retry_host_init - Retry host initialization if allowed + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_retry_host_init(struct ibmvfc_host *vhost) +{ + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { + if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) { + dev_err(vhost->dev, + "Host initialization retries exceeded. Taking adapter offline\n"); + ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); + } else if (vhost->init_retries == IBMVFC_MAX_INIT_RETRIES) + __ibmvfc_reset_host(vhost); + else + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); + } + + wake_up(&vhost->work_wait_q); +} + +/** + * __ibmvfc_find_target - Find the specified scsi_target (no locking) + * @starget: scsi target struct + * + * Return value: + * ibmvfc_target struct / NULL if not found + **/ +static struct ibmvfc_target *__ibmvfc_find_target(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct ibmvfc_host *vhost = shost_priv(shost); + struct ibmvfc_target *tgt; + + list_for_each_entry(tgt, &vhost->targets, queue) + if (tgt->target_id == starget->id) + return tgt; + return NULL; +} + +/** + * ibmvfc_find_target - Find the specified scsi_target + * @starget: scsi target struct + * + * Return value: + * ibmvfc_target struct / NULL if not found + **/ +static struct ibmvfc_target *ibmvfc_find_target(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct ibmvfc_target *tgt; + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + tgt = __ibmvfc_find_target(starget); + spin_unlock_irqrestore(shost->host_lock, flags); + return tgt; +} + +/** + * ibmvfc_get_host_speed - Get host port speed + * @shost: scsi host struct + * + * Return value: + * none + **/ +static void ibmvfc_get_host_speed(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + if (vhost->state == IBMVFC_ACTIVE) { + switch (vhost->login_buf->resp.link_speed / 100) { + case 1: + fc_host_speed(shost) = FC_PORTSPEED_1GBIT; + break; + case 2: + fc_host_speed(shost) = FC_PORTSPEED_2GBIT; + break; + case 4: + fc_host_speed(shost) = FC_PORTSPEED_4GBIT; + break; + case 8: + fc_host_speed(shost) = FC_PORTSPEED_8GBIT; + break; + case 10: + fc_host_speed(shost) = FC_PORTSPEED_10GBIT; + break; + case 16: + fc_host_speed(shost) = FC_PORTSPEED_16GBIT; + break; + default: + ibmvfc_log(vhost, 3, "Unknown port speed: %ld Gbit\n", + vhost->login_buf->resp.link_speed / 100); + fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; + break; + } + } else + fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; + spin_unlock_irqrestore(shost->host_lock, flags); +} + +/** + * ibmvfc_get_host_port_state - Get host port state + * @shost: scsi host struct + * + * Return value: + * none + **/ +static void ibmvfc_get_host_port_state(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + switch (vhost->state) { + case IBMVFC_INITIALIZING: + case IBMVFC_ACTIVE: + fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; + break; + case IBMVFC_LINK_DOWN: + fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; + break; + case IBMVFC_LINK_DEAD: + case IBMVFC_HOST_OFFLINE: + fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; + break; + case IBMVFC_HALTED: + fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED; + break; + default: + ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state); + fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; + break; + } + spin_unlock_irqrestore(shost->host_lock, flags); +} + +/** + * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout + * @rport: rport struct + * @timeout: timeout value + * + * Return value: + * none + **/ +static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) +{ + if (timeout) + rport->dev_loss_tmo = timeout; + else + rport->dev_loss_tmo = 1; +} + +/** + * ibmvfc_get_starget_node_name - Get SCSI target's node name + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_node_name(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0; +} + +/** + * ibmvfc_get_starget_port_name - Get SCSI target's port name + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_port_name(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0; +} + +/** + * ibmvfc_get_starget_port_id - Get SCSI target's port ID + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_port_id(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1; +} + +/** + * ibmvfc_wait_while_resetting - Wait while the host resets + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost) +{ + long timeout = wait_event_timeout(vhost->init_wait_q, + (vhost->state == IBMVFC_ACTIVE || + vhost->state == IBMVFC_HOST_OFFLINE || + vhost->state == IBMVFC_LINK_DEAD), + (init_timeout * HZ)); + + return timeout ? 0 : -EIO; +} + +/** + * ibmvfc_issue_fc_host_lip - Re-initiate link initialization + * @shost: scsi host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + + dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n"); + ibmvfc_reset_host(vhost); + return ibmvfc_wait_while_resetting(vhost); +} + +/** + * ibmvfc_gather_partition_info - Gather info about the LPAR + * + * Return value: + * none + **/ +static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost) +{ + struct device_node *rootdn; + const char *name; + const unsigned int *num; + + rootdn = of_find_node_by_path("/"); + if (!rootdn) + return; + + name = of_get_property(rootdn, "ibm,partition-name", NULL); + if (name) + strncpy(vhost->partition_name, name, sizeof(vhost->partition_name)); + num = of_get_property(rootdn, "ibm,partition-no", NULL); + if (num) + vhost->partition_number = *num; + of_node_put(rootdn); +} + +/** + * ibmvfc_set_login_info - Setup info for NPIV login + * @vhost: ibmvfc host struct + * + * Return value: + * none + **/ +static void ibmvfc_set_login_info(struct ibmvfc_host *vhost) +{ + struct ibmvfc_npiv_login *login_info = &vhost->login_info; + struct device_node *of_node = vhost->dev->archdata.of_node; + const char *location; + + memset(login_info, 0, sizeof(*login_info)); + + login_info->ostype = IBMVFC_OS_LINUX; + login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9; + login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu); + login_info->max_response = sizeof(struct ibmvfc_fcp_rsp); + login_info->partition_num = vhost->partition_number; + login_info->vfc_frame_version = 1; + login_info->fcp_version = 3; + if (vhost->client_migrated) + login_info->flags = IBMVFC_CLIENT_MIGRATED; + + login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ; + login_info->capabilities = IBMVFC_CAN_MIGRATE; + login_info->async.va = vhost->async_crq.msg_token; + login_info->async.len = vhost->async_crq.size; + strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME); + strncpy(login_info->device_name, + vhost->host->shost_gendev.bus_id, IBMVFC_MAX_NAME); + + location = of_get_property(of_node, "ibm,loc-code", NULL); + location = location ? location : vhost->dev->bus_id; + strncpy(login |