| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Bryant G. Ly | 11142 | 66.29% | 13 | 41.94% |
| Michael Cyr | 5639 | 33.55% | 7 | 22.58% |
| Laura Abbott | 6 | 0.04% | 2 | 6.45% |
| Wei Yongjun | 6 | 0.04% | 2 | 6.45% |
| David Disseldorp | 5 | 0.03% | 1 | 3.23% |
| Gustavo A. R. Silva | 3 | 0.02% | 1 | 3.23% |
| Thomas Gleixner | 2 | 0.01% | 1 | 3.23% |
| Michael Christie | 2 | 0.01% | 2 | 6.45% |
| Saurav Girepunje | 1 | 0.01% | 1 | 3.23% |
| Arvind Yadav | 1 | 0.01% | 1 | 3.23% |
| Total | 16807 | 31 |
// SPDX-License-Identifier: GPL-2.0-or-later /******************************************************************************* * IBM Virtual SCSI Target Driver * Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp. * Santiago Leon (santil@us.ibm.com) IBM Corp. * Linda Xie (lxie@us.ibm.com) IBM Corp. * * Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org> * Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org> * * Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com> * Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com> * ****************************************************************************/ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/list.h> #include <linux/string.h> #include <linux/delay.h> #include <target/target_core_base.h> #include <target/target_core_fabric.h> #include <asm/hvcall.h> #include <asm/vio.h> #include <scsi/viosrp.h> #include "ibmvscsi_tgt.h" #define IBMVSCSIS_VERSION "v0.2" #define INITIAL_SRP_LIMIT 800 #define DEFAULT_MAX_SECTORS 256 #define MAX_TXU 1024 * 1024 static uint max_vdma_size = MAX_H_COPY_RDMA; static char system_id[SYS_ID_NAME_LEN] = ""; static char partition_name[PARTITION_NAMELEN] = "UNKNOWN"; static uint partition_number = -1; /* Adapter list and lock to control it */ static DEFINE_SPINLOCK(ibmvscsis_dev_lock); static LIST_HEAD(ibmvscsis_dev_list); static long ibmvscsis_parse_command(struct scsi_info *vscsi, struct viosrp_crq *crq); static void ibmvscsis_adapter_idle(struct scsi_info *vscsi); static void ibmvscsis_determine_resid(struct se_cmd *se_cmd, struct srp_rsp *rsp) { u32 residual_count = se_cmd->residual_count; if (!residual_count) return; if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { if (se_cmd->data_direction == DMA_TO_DEVICE) { /* residual data from an underflow write */ rsp->flags = SRP_RSP_FLAG_DOUNDER; rsp->data_out_res_cnt = cpu_to_be32(residual_count); } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { /* residual data from an underflow read */ rsp->flags = SRP_RSP_FLAG_DIUNDER; rsp->data_in_res_cnt = cpu_to_be32(residual_count); } } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { if (se_cmd->data_direction == DMA_TO_DEVICE) { /* residual data from an overflow write */ rsp->flags = SRP_RSP_FLAG_DOOVER; rsp->data_out_res_cnt = cpu_to_be32(residual_count); } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { /* residual data from an overflow read */ rsp->flags = SRP_RSP_FLAG_DIOVER; rsp->data_in_res_cnt = cpu_to_be32(residual_count); } } } /** * connection_broken() - Determine if the connection to the client is good * @vscsi: Pointer to our adapter structure * * This function attempts to send a ping MAD to the client. If the call to * queue the request returns H_CLOSED then the connection has been broken * and the function returns TRUE. * * EXECUTION ENVIRONMENT: * Interrupt or Process environment */ static bool connection_broken(struct scsi_info *vscsi) { struct viosrp_crq *crq; u64 buffer[2] = { 0, 0 }; long h_return_code; bool rc = false; /* create a PING crq */ crq = (struct viosrp_crq *)&buffer; crq->valid = VALID_CMD_RESP_EL; crq->format = MESSAGE_IN_CRQ; crq->status = PING; h_return_code = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), cpu_to_be64(buffer[MSG_LOW])); dev_dbg(&vscsi->dev, "Connection_broken: rc %ld\n", h_return_code); if (h_return_code == H_CLOSED) rc = true; return rc; } /** * ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue * @vscsi: Pointer to our adapter structure * * This function calls h_free_q then frees the interrupt bit etc. * It must release the lock before doing so because of the time it can take * for h_free_crq in PHYP * NOTE: the caller must make sure that state and or flags will prevent * interrupt handler from scheduling work. * NOTE: anyone calling this function may need to set the CRQ_CLOSED flag * we can't do it here, because we don't have the lock * * EXECUTION ENVIRONMENT: * Process level */ static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi) { long qrc; long rc = ADAPT_SUCCESS; int ticks = 0; do { qrc = h_free_crq(vscsi->dds.unit_id); switch (qrc) { case H_SUCCESS: spin_lock_bh(&vscsi->intr_lock); vscsi->flags &= ~PREP_FOR_SUSPEND_FLAGS; spin_unlock_bh(&vscsi->intr_lock); break; case H_HARDWARE: case H_PARAMETER: dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n", qrc); rc = ERROR; break; case H_BUSY: case H_LONG_BUSY_ORDER_1_MSEC: /* msleep not good for small values */ usleep_range(1000, 2000); ticks += 1; break; case H_LONG_BUSY_ORDER_10_MSEC: usleep_range(10000, 20000); ticks += 10; break; case H_LONG_BUSY_ORDER_100_MSEC: msleep(100); ticks += 100; break; case H_LONG_BUSY_ORDER_1_SEC: ssleep(1); ticks += 1000; break; case H_LONG_BUSY_ORDER_10_SEC: ssleep(10); ticks += 10000; break; case H_LONG_BUSY_ORDER_100_SEC: ssleep(100); ticks += 100000; break; default: dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n", qrc); rc = ERROR; break; } /* * dont wait more then 300 seconds * ticks are in milliseconds more or less */ if (ticks > 300000 && qrc != H_SUCCESS) { rc = ERROR; dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n"); } } while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS); dev_dbg(&vscsi->dev, "Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc); return rc; } /** * ibmvscsis_delete_client_info() - Helper function to Delete Client Info * @vscsi: Pointer to our adapter structure * @client_closed: True if client closed its queue * * Deletes information specific to the client when the client goes away * * EXECUTION ENVIRONMENT: * Interrupt or Process */ static void ibmvscsis_delete_client_info(struct scsi_info *vscsi, bool client_closed) { vscsi->client_cap = 0; /* * Some things we don't want to clear if we're closing the queue, * because some clients don't resend the host handshake when they * get a transport event. */ if (client_closed) vscsi->client_data.os_type = 0; } /** * ibmvscsis_free_command_q() - Free Command Queue * @vscsi: Pointer to our adapter structure * * This function calls unregister_command_q, then clears interrupts and * any pending interrupt acknowledgments associated with the command q. * It also clears memory if there is no error. * * PHYP did not meet the PAPR architecture so that we must give up the * lock. This causes a timing hole regarding state change. To close the * hole this routine does accounting on any change that occurred during * the time the lock is not held. * NOTE: must give up and then acquire the interrupt lock, the caller must * make sure that state and or flags will prevent interrupt handler from * scheduling work. * * EXECUTION ENVIRONMENT: * Process level, interrupt lock is held */ static long ibmvscsis_free_command_q(struct scsi_info *vscsi) { int bytes; u32 flags_under_lock; u16 state_under_lock; long rc = ADAPT_SUCCESS; if (!(vscsi->flags & CRQ_CLOSED)) { vio_disable_interrupts(vscsi->dma_dev); state_under_lock = vscsi->new_state; flags_under_lock = vscsi->flags; vscsi->phyp_acr_state = 0; vscsi->phyp_acr_flags = 0; spin_unlock_bh(&vscsi->intr_lock); rc = ibmvscsis_unregister_command_q(vscsi); spin_lock_bh(&vscsi->intr_lock); if (state_under_lock != vscsi->new_state) vscsi->phyp_acr_state = vscsi->new_state; vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags); if (rc == ADAPT_SUCCESS) { bytes = vscsi->cmd_q.size * PAGE_SIZE; memset(vscsi->cmd_q.base_addr, 0, bytes); vscsi->cmd_q.index = 0; vscsi->flags |= CRQ_CLOSED; ibmvscsis_delete_client_info(vscsi, false); } dev_dbg(&vscsi->dev, "free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, vscsi->phyp_acr_state); } return rc; } /** * ibmvscsis_cmd_q_dequeue() - Get valid Command element * @mask: Mask to use in case index wraps * @current_index: Current index into command queue * @base_addr: Pointer to start of command queue * * Returns a pointer to a valid command element or NULL, if the command * queue is empty * * EXECUTION ENVIRONMENT: * Interrupt environment, interrupt lock held */ static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask, uint *current_index, struct viosrp_crq *base_addr) { struct viosrp_crq *ptr; ptr = base_addr + *current_index; if (ptr->valid) { *current_index = (*current_index + 1) & mask; dma_rmb(); } else { ptr = NULL; } return ptr; } /** * ibmvscsis_send_init_message() - send initialize message to the client * @vscsi: Pointer to our adapter structure * @format: Which Init Message format to send * * EXECUTION ENVIRONMENT: * Interrupt environment interrupt lock held */ static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format) { struct viosrp_crq *crq; u64 buffer[2] = { 0, 0 }; long rc; crq = (struct viosrp_crq *)&buffer; crq->valid = VALID_INIT_MSG; crq->format = format; rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), cpu_to_be64(buffer[MSG_LOW])); return rc; } /** * ibmvscsis_check_init_msg() - Check init message valid * @vscsi: Pointer to our adapter structure * @format: Pointer to return format of Init Message, if any. * Set to UNUSED_FORMAT if no Init Message in queue. * * Checks if an initialize message was queued by the initiatior * after the queue was created and before the interrupt was enabled. * * EXECUTION ENVIRONMENT: * Process level only, interrupt lock held */ static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format) { struct viosrp_crq *crq; long rc = ADAPT_SUCCESS; crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index, vscsi->cmd_q.base_addr); if (!crq) { *format = (uint)UNUSED_FORMAT; } else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) { *format = (uint)INIT_MSG; crq->valid = INVALIDATE_CMD_RESP_EL; dma_rmb(); /* * the caller has ensured no initialize message was * sent after the queue was * created so there should be no other message on the queue. */ crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index, vscsi->cmd_q.base_addr); if (crq) { *format = (uint)(crq->format); rc = ERROR; crq->valid = INVALIDATE_CMD_RESP_EL; dma_rmb(); } } else { *format = (uint)(crq->format); rc = ERROR; crq->valid = INVALIDATE_CMD_RESP_EL; dma_rmb(); } return rc; } /** * ibmvscsis_disconnect() - Helper function to disconnect * @work: Pointer to work_struct, gives access to our adapter structure * * An error has occurred or the driver received a Transport event, * and the driver is requesting that the command queue be de-registered * in a safe manner. If there is no outstanding I/O then we can stop the * queue. If we are restarting the queue it will be reflected in the * the state of the adapter. * * EXECUTION ENVIRONMENT: * Process environment */ static void ibmvscsis_disconnect(struct work_struct *work) { struct scsi_info *vscsi = container_of(work, struct scsi_info, proc_work); u16 new_state; bool wait_idle = false; spin_lock_bh(&vscsi->intr_lock); new_state = vscsi->new_state; vscsi->new_state = 0; vscsi->flags |= DISCONNECT_SCHEDULED; vscsi->flags &= ~SCHEDULE_DISCONNECT; dev_dbg(&vscsi->dev, "disconnect: flags 0x%x, state 0x%hx\n", vscsi->flags, vscsi->state); /* * check which state we are in and see if we * should transitition to the new state */ switch (vscsi->state) { /* Should never be called while in this state. */ case NO_QUEUE: /* * Can never transition from this state; * igonore errors and logout. */ case UNCONFIGURING: break; /* can transition from this state to UNCONFIGURING */ case ERR_DISCONNECT: if (new_state == UNCONFIGURING) vscsi->state = new_state; break; /* * Can transition from this state to to unconfiguring * or err disconnect. */ case ERR_DISCONNECT_RECONNECT: switch (new_state) { case UNCONFIGURING: case ERR_DISCONNECT: vscsi->state = new_state; break; case WAIT_IDLE: break; default: break; } break; /* can transition from this state to UNCONFIGURING */ case ERR_DISCONNECTED: if (new_state == UNCONFIGURING) vscsi->state = new_state; break; case WAIT_ENABLED: switch (new_state) { case UNCONFIGURING: vscsi->state = new_state; vscsi->flags |= RESPONSE_Q_DOWN; vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED); dma_rmb(); if (vscsi->flags & CFG_SLEEPING) { vscsi->flags &= ~CFG_SLEEPING; complete(&vscsi->unconfig); } break; /* should never happen */ case ERR_DISCONNECT: case ERR_DISCONNECT_RECONNECT: case WAIT_IDLE: dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n", vscsi->state); break; } break; case WAIT_IDLE: switch (new_state) { case UNCONFIGURING: vscsi->flags |= RESPONSE_Q_DOWN; vscsi->state = new_state; vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED); ibmvscsis_free_command_q(vscsi); break; case ERR_DISCONNECT: case ERR_DISCONNECT_RECONNECT: vscsi->state = new_state; break; } break; /* * Initiator has not done a successful srp login * or has done a successful srp logout ( adapter was not * busy). In the first case there can be responses queued * waiting for space on the initiators response queue (MAD) * The second case the adapter is idle. Assume the worse case, * i.e. the second case. */ case WAIT_CONNECTION: case CONNECTED: case SRP_PROCESSING: wait_idle = true; vscsi->state = new_state; break; /* can transition from this state to UNCONFIGURING */ case UNDEFINED: if (new_state == UNCONFIGURING) vscsi->state = new_state; break; default: break; } if (wait_idle) { dev_dbg(&vscsi->dev, "disconnect start wait, active %d, sched %d\n", (int)list_empty(&vscsi->active_q), (int)list_empty(&vscsi->schedule_q)); if (!list_empty(&vscsi->active_q) || !list_empty(&vscsi->schedule_q)) { vscsi->flags |= WAIT_FOR_IDLE; dev_dbg(&vscsi->dev, "disconnect flags 0x%x\n", vscsi->flags); /* * This routine is can not be called with the interrupt * lock held. */ spin_unlock_bh(&vscsi->intr_lock); wait_for_completion(&vscsi->wait_idle); spin_lock_bh(&vscsi->intr_lock); } dev_dbg(&vscsi->dev, "disconnect stop wait\n"); ibmvscsis_adapter_idle(vscsi); } spin_unlock_bh(&vscsi->intr_lock); } /** * ibmvscsis_post_disconnect() - Schedule the disconnect * @vscsi: Pointer to our adapter structure * @new_state: State to move to after disconnecting * @flag_bits: Flags to turn on in adapter structure * * If it's already been scheduled, then see if we need to "upgrade" * the new state (if the one passed in is more "severe" than the * previous one). * * PRECONDITION: * interrupt lock is held */ static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state, uint flag_bits) { uint state; /* check the validity of the new state */ switch (new_state) { case UNCONFIGURING: case ERR_DISCONNECT: case ERR_DISCONNECT_RECONNECT: case WAIT_IDLE: break; default: dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n", new_state); return; } vscsi->flags |= flag_bits; dev_dbg(&vscsi->dev, "post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n", new_state, flag_bits, vscsi->flags, vscsi->state); if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) { vscsi->flags |= SCHEDULE_DISCONNECT; vscsi->new_state = new_state; INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect); (void)queue_work(vscsi->work_q, &vscsi->proc_work); } else { if (vscsi->new_state) state = vscsi->new_state; else state = vscsi->state; switch (state) { case NO_QUEUE: case UNCONFIGURING: break; case ERR_DISCONNECTED: case ERR_DISCONNECT: case UNDEFINED: if (new_state == UNCONFIGURING) vscsi->new_state = new_state; break; case ERR_DISCONNECT_RECONNECT: switch (new_state) { case UNCONFIGURING: case ERR_DISCONNECT: vscsi->new_state = new_state; break; default: break; } break; case WAIT_ENABLED: case WAIT_IDLE: case WAIT_CONNECTION: case CONNECTED: case SRP_PROCESSING: vscsi->new_state = new_state; break; default: break; } } dev_dbg(&vscsi->dev, "Leaving post_disconnect: flags 0x%x, new_state 0x%x\n", vscsi->flags, vscsi->new_state); } /** * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message * @vscsi: Pointer to our adapter structure * * Must be called with interrupt lock held. */ static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi) { long rc = ADAPT_SUCCESS; switch (vscsi->state) { case NO_QUEUE: case ERR_DISCONNECT: case ERR_DISCONNECT_RECONNECT: case ERR_DISCONNECTED: case UNCONFIGURING: case UNDEFINED: rc = ERROR; break; case WAIT_CONNECTION: vscsi->state = CONNECTED; break; case WAIT_IDLE: case SRP_PROCESSING: case CONNECTED: case WAIT_ENABLED: default: rc = ERROR; dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n", vscsi->state); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; } return rc; } /** * ibmvscsis_handle_init_msg() - Respond to an Init Message * @vscsi: Pointer to our adapter structure * * Must be called with interrupt lock held. */ static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi) { long rc = ADAPT_SUCCESS; switch (vscsi->state) { case WAIT_CONNECTION: rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG); switch (rc) { case H_SUCCESS: vscsi->state = CONNECTED; break; case H_PARAMETER: dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); break; case H_DROPPED: dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", rc); rc = ERROR; ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; case H_CLOSED: dev_warn(&vscsi->dev, "init_msg: failed to send, rc %ld\n", rc); rc = 0; break; } break; case UNDEFINED: rc = ERROR; break; case UNCONFIGURING: break; case WAIT_ENABLED: case CONNECTED: case SRP_PROCESSING: case WAIT_IDLE: case NO_QUEUE: case ERR_DISCONNECT: case ERR_DISCONNECT_RECONNECT: case ERR_DISCONNECTED: default: rc = ERROR; dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n", vscsi->state); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; } return rc; } /** * ibmvscsis_init_msg() - Respond to an init message * @vscsi: Pointer to our adapter structure * @crq: Pointer to CRQ element containing the Init Message * * EXECUTION ENVIRONMENT: * Interrupt, interrupt lock held */ static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq) { long rc = ADAPT_SUCCESS; dev_dbg(&vscsi->dev, "init_msg: state 0x%hx\n", vscsi->state); rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, 0); if (rc == H_SUCCESS) { vscsi->client_data.partition_number = be64_to_cpu(*(u64 *)vscsi->map_buf); dev_dbg(&vscsi->dev, "init_msg, part num %d\n", vscsi->client_data.partition_number); } else { dev_dbg(&vscsi->dev, "init_msg h_vioctl rc %ld\n", rc); rc = ADAPT_SUCCESS; } if (crq->format == INIT_MSG) { rc = ibmvscsis_handle_init_msg(vscsi); } else if (crq->format == INIT_COMPLETE_MSG) { rc = ibmvscsis_handle_init_compl_msg(vscsi); } else { rc = ERROR; dev_err(&vscsi->dev, "init_msg: invalid format %d\n", (uint)crq->format); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); } return rc; } /** * ibmvscsis_establish_new_q() - Establish new CRQ queue * @vscsi: Pointer to our adapter structure * * Must be called with interrupt lock held. */ static long ibmvscsis_establish_new_q(struct scsi_info *vscsi) { long rc = ADAPT_SUCCESS; uint format; rc = h_vioctl(vscsi->dds.unit_id, H_ENABLE_PREPARE_FOR_SUSPEND, 30000, 0, 0, 0, 0); if (rc == H_SUCCESS) vscsi->flags |= PREP_FOR_SUSPEND_ENABLED; else if (rc != H_NOT_FOUND) dev_err(&vscsi->dev, "Error from Enable Prepare for Suspend: %ld\n", rc); vscsi->flags &= PRESERVE_FLAG_FIELDS; vscsi->rsp_q_timer.timer_pops = 0; vscsi->debit = 0; vscsi->credit = 0; rc = vio_enable_interrupts(vscsi->dma_dev); if (rc) { dev_warn(&vscsi->dev, "establish_new_q: failed to enable interrupts, rc %ld\n", rc); return rc; } rc = ibmvscsis_check_init_msg(vscsi, &format); if (rc) { dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n", rc); return rc; } if (format == UNUSED_FORMAT) { rc = ibmvscsis_send_init_message(vscsi, INIT_MSG); switch (rc) { case H_SUCCESS: case H_DROPPED: case H_CLOSED: rc = ADAPT_SUCCESS; break; case H_PARAMETER: case H_HARDWARE: break; default: vscsi->state = UNDEFINED; rc = H_HARDWARE; break; } } else if (format == INIT_MSG) { rc = ibmvscsis_handle_init_msg(vscsi); } return rc; } /** * ibmvscsis_reset_queue() - Reset CRQ Queue * @vscsi: Pointer to our adapter structure * * This function calls h_free_q and then calls h_reg_q and does all * of the bookkeeping to get us back to where we can communicate. * * Actually, we don't always call h_free_crq. A problem was discovered * where one partition would close and reopen his queue, which would * cause his partner to get a transport event, which would cause him to * close and reopen his queue, which would cause the original partition * to get a transport event, etc., etc. To prevent this, we don't * actually close our queue if the client initiated the reset, (i.e. * either we got a transport event or we have detected that the client's * queue is gone) * * EXECUTION ENVIRONMENT: * Process environment, called with interrupt lock held */ static void ibmvscsis_reset_queue(struct scsi_info *vscsi) { int bytes; long rc = ADAPT_SUCCESS; dev_dbg(&vscsi->dev, "reset_queue: flags 0x%x\n", vscsi->flags); /* don't reset, the client did it for us */ if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) { vscsi->flags &= PRESERVE_FLAG_FIELDS; vscsi->rsp_q_timer.timer_pops = 0; vscsi->debit = 0; vscsi->credit = 0; vscsi->state = WAIT_CONNECTION; vio_enable_interrupts(vscsi->dma_dev); } else { rc = ibmvscsis_free_command_q(vscsi); if (rc == ADAPT_SUCCESS) { vscsi->state = WAIT_CONNECTION; bytes = vscsi->cmd_q.size * PAGE_SIZE; rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes); if (rc == H_CLOSED || rc == H_SUCCESS) { rc = ibmvscsis_establish_new_q(vscsi); } if (rc != ADAPT_SUCCESS) { dev_dbg(&vscsi->dev, "reset_queue: reg_crq rc %ld\n", rc); vscsi->state = ERR_DISCONNECTED; vscsi->flags |= RESPONSE_Q_DOWN; ibmvscsis_free_command_q(vscsi); } } else { vscsi->state = ERR_DISCONNECTED; vscsi->flags |= RESPONSE_Q_DOWN; } } } /** * ibmvscsis_free_cmd_resources() - Free command resources * @vscsi: Pointer to our adapter structure * @cmd: Command which is not longer in use * * Must be called with interrupt lock held. */ static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd) { struct iu_entry *iue = cmd->iue; switch (cmd->type) { case TASK_MANAGEMENT: case SCSI_CDB: /* * When the queue goes down this value is cleared, so it * cannot be cleared in this general purpose function. */ if (vscsi->debit) vscsi->debit -= 1; break; case ADAPTER_MAD: vscsi->flags &= ~PROCESSING_MAD; break; case UNSET_TYPE: break; default: dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n", cmd->type); break; } cmd->iue = NULL; list_add_tail(&cmd->list, &vscsi->free_cmd); srp_iu_put(iue); if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) && list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) { vscsi->flags &= ~WAIT_FOR_IDLE; complete(&vscsi->wait_idle); } } /** * ibmvscsis_ready_for_suspend() - Helper function to call VIOCTL * @vscsi: Pointer to our adapter structure * @idle: Indicates whether we were called from adapter_idle. This * is important to know if we need to do a disconnect, since if * we're called from adapter_idle, we're still processing the * current disconnect, so we can't just call post_disconnect. * * This function is called when the adapter is idle when phyp has sent * us a Prepare for Suspend Transport Event. * * EXECUTION ENVIRONMENT: * Process or interrupt environment called with interrupt lock held */ static long ibmvscsis_ready_for_suspend(struct scsi_info *vscsi, bool idle) { long rc = 0; struct viosrp_crq *crq; /* See if there is a Resume event in the queue */ crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; dev_dbg(&vscsi->dev, "ready_suspend: flags 0x%x, state 0x%hx crq_valid:%x\n", vscsi->flags, vscsi->state, (int)crq->valid); if (!(vscsi->flags & PREP_FOR_SUSPEND_ABORTED) && !(crq->valid)) { rc = h_vioctl(vscsi->dds.unit_id, H_READY_FOR_SUSPEND, 0, 0, 0, 0, 0); if (rc) { dev_err(&vscsi->dev, "Ready for Suspend Vioctl failed: %ld\n", rc); rc = 0; } } else if (((vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE) && (vscsi->flags & PREP_FOR_SUSPEND_ABORTED)) || ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) || (crq->format != RESUME_FROM_SUSP)))) { if (idle) { vscsi->state = ERR_DISCONNECT_RECONNECT; ibmvscsis_reset_queue(vscsi); rc = -1; } else if (vscsi->state == CONNECTED) { ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); } vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE; if ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) || (crq->format != RESUME_FROM_SUSP))) dev_err(&vscsi->dev, "Invalid element in CRQ after Prepare for Suspend"); } vscsi->flags &= ~(PREP_FOR_SUSPEND_PENDING | PREP_FOR_SUSPEND_ABORTED); return rc; } /** * ibmvscsis_trans_event() - Handle a Transport Event * @vscsi: Pointer to our adapter structure * @crq: Pointer to CRQ entry containing the Transport Event * * Do the logic to close the I_T nexus. This function may not * behave to specification. * * EXECUTION ENVIRONMENT: * Interrupt, interrupt lock held */ static long ibmvscsis_trans_event(struct scsi_info *vscsi, struct viosrp_crq *crq) { long rc = ADAPT_SUCCESS; dev_dbg(&vscsi->dev, "trans_event: format %d, flags 0x%x, state 0x%hx\n", (int)crq->format, vscsi->flags, vscsi->state); switch (crq->format) { case MIGRATED: case PARTNER_FAILED: case PARTNER_DEREGISTER: ibmvscsis_delete_client_info(vscsi, true); if (crq->format == MIGRATED) vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE; switch (vscsi->state) { case NO_QUEUE: case ERR_DISCONNECTED: case UNDEFINED: break; case UNCONFIGURING: vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); break; case WAIT_ENABLED: break; case WAIT_CONNECTION: break; case CONNECTED: ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, (RESPONSE_Q_DOWN | TRANS_EVENT)); break; case SRP_PROCESSING: if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) || !list_empty(&vscsi->waiting_rsp) || !list_empty(&vscsi->active_q)) { dev_dbg(&vscsi->dev, "debit %d, sched %d, wait %d, active %d\n", vscsi->debit, (int)list_empty(&vscsi->schedule_q), (int)list_empty(&vscsi->waiting_rsp), (int)list_empty(&vscsi->active_q)); dev_warn(&vscsi->dev, "connection lost with outstanding work\n"); } else { dev_dbg(&vscsi->dev, "trans_event: SRP Processing, but no outstanding work\n"); } ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, (RESPONSE_Q_DOWN | TRANS_EVENT)); break; case ERR_DISCONNECT: case ERR_DISCONNECT_RECONNECT: case WAIT_IDLE: vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); break; } break; case PREPARE_FOR_SUSPEND: dev_dbg(&vscsi->dev, "Prep for Suspend, crq status = 0x%x\n", (int)crq->status); switch (vscsi->state) { case ERR_DISCONNECTED: case WAIT_CONNECTION: case CONNECTED: ibmvscsis_ready_for_suspend(vscsi, false); break; case SRP_PROCESSING: vscsi->resume_state = vscsi->state; vscsi->flags |= PREP_FOR_SUSPEND_PENDING; if (crq->status == CRQ_ENTRY_OVERWRITTEN) vscsi->flags |= PREP_FOR_SUSPEND_OVERWRITE; ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0); break; case NO_QUEUE: case UNDEFINED: case UNCONFIGURING: case WAIT_ENABLED: case ERR_DISCONNECT: case ERR_DISCONNECT_RECONNECT: case WAIT_IDLE: dev_err(&vscsi->dev, "Invalid state for Prepare for Suspend Trans Event: 0x%x\n", vscsi->state); break; } break; case RESUME_FROM_SUSP: dev_dbg(&vscsi->dev, "Resume from Suspend, crq status = 0x%x\n", (int)crq->status); if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) { vscsi->flags |= PREP_FOR_SUSPEND_ABORTED; } else { if ((crq->status == CRQ_ENTRY_OVERWRITTEN) || (vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE)) { ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE; } } break; default: rc = ERROR; dev_err(&vscsi->dev, "trans_event: invalid format %d\n", (uint)crq->format); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, RESPONSE_Q_DOWN); break; } rc = vscsi->flags & SCHEDULE_DISCONNECT; dev_dbg(&vscsi->dev, "Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n", vscsi->flags, vscsi->state, rc); return rc; } /** * ibmvscsis_poll_cmd_q() - Poll Command Queue * @vscsi: Pointer to our adapter structure * * Called to handle command elements that may have arrived while * interrupts were disabled. * * EXECUTION ENVIRONMENT: * intr_lock must be held */ static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi) { struct viosrp_crq *crq; long rc; bool ack = true; volatile u8 valid; dev_dbg(&vscsi->dev, "poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n", vscsi->flags, vscsi->state, vscsi->cmd_q.index); rc = vscsi->flags & SCHEDULE_DISCONNECT; crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; valid = crq->valid; dma_rmb(); while (valid) { poll_work: vscsi->cmd_q.index = (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; if (!rc) { rc = ibmvscsis_parse_command(vscsi, crq); } else { if ((uint)crq->valid == VALID_TRANS_EVENT) { /* * must service the transport layer events even * in an error state, dont break out until all * the consecutive transport events have been * processed */ rc = ibmvscsis_trans_event(vscsi, crq); } else if (vscsi->flags & TRANS_EVENT) { /* * if a tranport event has occurred leave * everything but transport events on the queue */ dev_dbg(&vscsi->dev, "poll_cmd_q, ignoring\n"); /* * need to decrement the queue index so we can * look at the elment again */ if (vscsi->cmd_q.index) vscsi->cmd_q.index -= 1; else /* * index is at 0 it just wrapped. * have it index last element in q */ vscsi->cmd_q.index = vscsi->cmd_q.mask; break; } } crq->valid = INVALIDATE_CMD_RESP_EL; crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; valid = crq->valid; dma_rmb(); } if (!rc) { if (ack) { vio_enable_interrupts(vscsi->dma_dev); ack = false; dev_dbg(&vscsi->dev, "poll_cmd_q, reenabling interrupts\n"); } valid = crq->valid; dma_rmb(); if (valid) goto poll_work; } dev_dbg(&vscsi->dev, "Leaving poll_cmd_q: rc %ld\n", rc); } /** * ibmvscsis_free_cmd_qs() - Free elements in queue * @vscsi: Pointer to our adapter structure * * Free all of the elements on all queues that are waiting for * whatever reason. * * PRECONDITION: * Called with interrupt lock held */ static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi) { struct ibmvscsis_cmd *cmd, *nxt; dev_dbg(&vscsi->dev, "free_cmd_qs: waiting_rsp empty %d, timer starter %d\n", (int)list_empty(&vscsi->waiting_rsp), vscsi->rsp_q_timer.started); list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) { list_del(&cmd->list); ibmvscsis_free_cmd_resources(vscsi, cmd); } } /** * ibmvscsis_get_free_cmd() - Get free command from list * @vscsi: Pointer to our adapter structure * * Must be called with interrupt lock held. */ static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi) { struct ibmvscsis_cmd *cmd = NULL; struct iu_entry *iue; iue = srp_iu_get(&vscsi->target); if (iue) { cmd = list_first_entry_or_null(&vscsi->free_cmd, struct ibmvscsis_cmd, list); if (cmd) { if (cmd->abort_cmd) cmd->abort_cmd = NULL; cmd->flags &= ~(DELAY_SEND); list_del(&cmd->list); cmd->iue = iue; cmd->type = UNSET_TYPE; memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd)); } else { srp_iu_put(iue); } } return cmd; } /** * ibmvscsis_adapter_idle() - Helper function to handle idle adapter * @vscsi: Pointer to our adapter structure * * This function is called when the adapter is idle when the driver * is attempting to clear an error condition. * The adapter is considered busy if any of its cmd queues * are non-empty. This function can be invoked * from the off level disconnect function. * * EXECUTION ENVIRONMENT: * Process environment called with interrupt lock held */ static void ibmvscsis_adapter_idle(struct scsi_info *vscsi) { int free_qs = false; long rc = 0; dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx\n", vscsi->flags, vscsi->state); /* Only need to free qs if we're disconnecting from client */ if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT) free_qs = true; switch (vscsi->state) { case UNCONFIGURING: ibmvscsis_free_command_q(vscsi); dma_rmb(); isync(); if (vscsi->flags & CFG_SLEEPING) { vscsi->flags &= ~CFG_SLEEPING; complete(&vscsi->unconfig); } break; case ERR_DISCONNECT_RECONNECT: ibmvscsis_reset_queue(vscsi); dev_dbg(&vscsi->dev, "adapter_idle, disc_rec: flags 0x%x\n", vscsi->flags); break; case ERR_DISCONNECT: ibmvscsis_free_command_q(vscsi); vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED); vscsi->flags |= RESPONSE_Q_DOWN; if (vscsi->tport.enabled) vscsi->state = ERR_DISCONNECTED; else vscsi->state = WAIT_ENABLED; dev_dbg(&vscsi->dev, "adapter_idle, disc: flags 0x%x, state 0x%hx\n", vscsi->flags, vscsi->state); break; case WAIT_IDLE: vscsi->rsp_q_timer.timer_pops = 0; vscsi->debit = 0; vscsi->credit = 0; if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) { vscsi->state = vscsi->resume_state; vscsi->resume_state = 0; rc = ibmvscsis_ready_for_suspend(vscsi, true); vscsi->flags &= ~DISCONNECT_SCHEDULED; if (rc) break; } else if (vscsi->flags & TRANS_EVENT) { vscsi->state = WAIT_CONNECTION; vscsi->flags &= PRESERVE_FLAG_FIELDS; } else { vscsi->state = CONNECTED; vscsi->flags &= ~DISCONNECT_SCHEDULED; } dev_dbg(&vscsi->dev, "adapter_idle, wait: flags 0x%x, state 0x%hx\n", vscsi->flags, vscsi->state); ibmvscsis_poll_cmd_q(vscsi); break; case ERR_DISCONNECTED: vscsi->flags &= ~DISCONNECT_SCHEDULED; dev_dbg(&vscsi->dev, "adapter_idle, disconnected: flags 0x%x, state 0x%hx\n", vscsi->flags, vscsi->state); break; default: dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n", vscsi->state); break; } if (free_qs) ibmvscsis_free_cmd_qs(vscsi); /* * There is a timing window where we could lose a disconnect request. * The known path to this window occurs during the DISCONNECT_RECONNECT * case above: reset_queue calls free_command_q, which will release the * interrupt lock. During that time, a new post_disconnect call can be * made with a "more severe" state (DISCONNECT or UNCONFIGURING). * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect * will only set the new_state. Now free_command_q reacquires the intr * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_ * FIELDS), and the disconnect is lost. This is particularly bad when * the new disconnect was for UNCONFIGURING, since the unconfigure hangs * forever. * Fix is that free command queue sets acr state and acr flags if there * is a change under the lock * note free command queue writes to this state it clears it * before releasing the lock, different drivers call the free command * queue different times so dont initialize above */ if (vscsi->phyp_acr_state != 0) { /* * set any bits in flags that may have been cleared by * a call to free command queue in switch statement * or reset queue */ vscsi->flags |= vscsi->phyp_acr_flags; ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0); vscsi->phyp_acr_state = 0; vscsi->phyp_acr_flags = 0; dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, vscsi->phyp_acr_state); } dev_dbg(&vscsi->dev, "Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n", vscsi->flags, vscsi->state, vscsi->new_state); } /** * ibmvscsis_copy_crq_packet() - Copy CRQ Packet * @vscsi: Pointer to our adapter structure * @cmd: Pointer to command element to use to process the request * @crq: Pointer to CRQ entry containing the request * * Copy the srp information unit from the hosted * partition using remote dma * * EXECUTION ENVIRONMENT: * Interrupt, interrupt lock held */ static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd, struct viosrp_crq *crq) { struct iu_entry *iue = cmd->iue; long rc = 0; u16 len; len = be16_to_cpu(crq->IU_length); if ((len > SRP_MAX_IU_LEN) || (len == 0)) { dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); return SRP_VIOLATION; } rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn, be64_to_cpu(crq->IU_data_ptr), vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma); switch (rc) { case H_SUCCESS: cmd->init_time = mftb(); iue->remote_token = crq->IU_data_ptr; iue->iu_len = len; dev_dbg(&vscsi->dev, "copy_crq: ioba 0x%llx, init_time 0x%llx\n", be64_to_cpu(crq->IU_data_ptr), cmd->init_time); break; case H_PERMISSION: if (connection_broken(vscsi)) ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, (RESPONSE_Q_DOWN | CLIENT_FAILED)); else ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", rc); break; case H_DEST_PARM: case H_SOURCE_PARM: default: dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; } return rc; } /** * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram * @vscsi: Pointer to our adapter structure * @iue: Information Unit containing the Adapter Info MAD request * * EXECUTION ENVIRONMENT: * Interrupt adapter lock is held */ static long ibmvscsis_adapter_info(struct scsi_info *vscsi, struct iu_entry *iue) { struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info; struct mad_adapter_info_data *info; uint flag_bits = 0; dma_addr_t token; long rc; mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS); if (be16_to_cpu(mad->common.length) > sizeof(*info)) { mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); return 0; } info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token, GFP_ATOMIC); if (!info) { dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", iue->target); mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); return 0; } /* Get remote info */ rc = h_copy_rdma(be16_to_cpu(mad->common.length), vscsi->dds.window[REMOTE].liobn, be64_to_cpu(mad->buffer), vscsi->dds.window[LOCAL].liobn, token); if (rc != H_SUCCESS) { if (rc == H_PERMISSION) { if (connection_broken(vscsi)) flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); } dev_warn(&vscsi->dev, "adapter_info: h_copy_rdma from client failed, rc %ld\n", rc); dev_dbg(&vscsi->dev, "adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n", be64_to_cpu(mad->buffer), vscsi->flags, flag_bits); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, flag_bits); goto free_dma; } /* * Copy client info, but ignore partition number, which we * already got from phyp - unless we failed to get it from * phyp (e.g. if we're running on a p5 system). */ if (vscsi->client_data.partition_number == 0) vscsi->client_data.partition_number = be32_to_cpu(info->partition_number); strncpy(vscsi->client_data.srp_version, info->srp_version, sizeof(vscsi->client_data.srp_version)); strncpy(vscsi->client_data.partition_name, info->partition_name, sizeof(vscsi->client_data.partition_name)); vscsi->client_data.mad_version = be32_to_cpu(info->mad_version); vscsi->client_data.os_type = be32_to_cpu(info->os_type); /* Copy our info */ strncpy(info->srp_version, SRP_VERSION, sizeof(info->srp_version)); strncpy(info->partition_name, vscsi->dds.partition_name, sizeof(info->partition_name)); info->partition_number = cpu_to_be32(vscsi->dds.partition_num); info->mad_version = cpu_to_be32(MAD_VERSION_1); info->os_type = cpu_to_be32(LINUX); memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu)); info->port_max_txu[0] = cpu_to_be32(MAX_TXU); dma_wmb(); rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn, token, vscsi->dds.window[REMOTE].liobn, be64_to_cpu(mad->buffer)); switch (rc) { case H_SUCCESS: break; case H_SOURCE_PARM: case H_DEST_PARM: case H_PERMISSION: if (connection_broken(vscsi)) flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); /* Fall through */ default: dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, flag_bits); break; } free_dma: dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token); dev_dbg(&vscsi->dev, "Leaving adapter_info, rc %ld\n", rc); return rc; } /** * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram * @vscsi: Pointer to our adapter structure * @iue: Information Unit containing the Capabilities MAD request * * NOTE: if you return an error from this routine you must be * disconnecting or you will cause a hang * * EXECUTION ENVIRONMENT: * Interrupt called with adapter lock held */ static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue) { struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities; struct capabilities *cap; struct mad_capability_common *common; dma_addr_t token; u16 olen, len, status, min_len, cap_len; u32 flag; uint flag_bits = 0; long rc = 0; olen = be16_to_cpu(mad->common.length); /* * struct capabilities hardcodes a couple capabilities after the * header, but the capabilities can actually be in any order. */ min_len = offsetof(struct capabilities, migration); if ((olen < min_len) || (olen > PAGE_SIZE)) { dev_warn(&vscsi->dev, "cap_mad: invalid len %d\n", olen); mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); return 0; } cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token, GFP_ATOMIC); if (!cap) { dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", iue->target); mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); return 0; } rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn, be64_to_cpu(mad->buffer), vscsi->dds.window[LOCAL].liobn, token); if (rc == H_SUCCESS) { strncpy(cap->name, dev_name(&vscsi->dma_dev->dev), SRP_MAX_LOC_LEN); len = olen - min_len; status = VIOSRP_MAD_SUCCESS; common = (struct mad_capability_common *)&cap->migration; while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) { dev_dbg(&vscsi->dev, "cap_mad: len left %hd, cap type %d, cap len %hd\n", len, be32_to_cpu(common->cap_type), be16_to_cpu(common->length)); cap_len = be16_to_cpu(common->length); if (cap_len > len) { dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n"); status = VIOSRP_MAD_FAILED; break; } if (cap_len == 0) { dev_err(&vscsi->dev, "cap_mad: cap len is 0\n"); status = VIOSRP_MAD_FAILED; break; } switch (common->cap_type) { default: dev_dbg(&vscsi->dev, "cap_mad: unsupported capability\n"); common->server_support = 0; flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED); cap->flags &= ~flag; break; } len = len - cap_len; common = (struct mad_capability_common *) ((char *)common + cap_len); } mad->common.status = cpu_to_be16(status); dma_wmb(); rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token, vscsi->dds.window[REMOTE].liobn, be64_to_cpu(mad->buffer)); if (rc != H_SUCCESS) { dev_dbg(&vscsi->dev, "cap_mad: failed to copy to client, rc %ld\n", rc); if (rc == H_PERMISSION) { if (connection_broken(vscsi)) flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); } dev_warn(&vscsi->dev, "cap_mad: error copying data to client, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, flag_bits); } } dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token); dev_dbg(&vscsi->dev, "Leaving cap_mad, rc %ld, client_cap 0x%x\n", rc, vscsi->client_cap); return rc; } /** * ibmvscsis_process_mad() - Service a MAnagement Data gram * @vscsi: Pointer to our adapter structure * @iue: Information Unit containing the MAD request * * Must be called with interrupt lock held. */ static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue) { struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; struct viosrp_empty_iu *empty; long rc = ADAPT_SUCCESS; switch (be32_to_cpu(mad->type)) { case VIOSRP_EMPTY_IU_TYPE: empty = &vio_iu(iue)->mad.empty_iu; vscsi->empty_iu_id = be64_to_cpu(empty->buffer); vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag); mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); break; case VIOSRP_ADAPTER_INFO_TYPE: rc = ibmvscsis_adapter_info(vscsi, iue); break; case VIOSRP_CAPABILITIES_TYPE: rc = ibmvscsis_cap_mad(vscsi, iue); break; case VIOSRP_ENABLE_FAST_FAIL: if (vscsi->state == CONNECTED) { vscsi->fast_fail = true; mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); } else { dev_warn(&vscsi->dev, "fast fail mad sent after login\n"); mad->status = cpu_to_be16(VIOSRP_MAD_FAILED); } break; default: mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED); break; } return rc; } /** * srp_snd_msg_failed() - Handle an error when sending a response * @vscsi: Pointer to our adapter structure * @rc: The return code from the h_send_crq command * * Must be called with interrupt lock held. */ static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc) { ktime_t kt; if (rc != H_DROPPED) { ibmvscsis_free_cmd_qs(vscsi); if (rc == H_CLOSED) vscsi->flags |= CLIENT_FAILED; /* don't flag the same problem multiple times */ if (!(vscsi->flags & RESPONSE_Q_DOWN)) { vscsi->flags |= RESPONSE_Q_DOWN; if (!(vscsi->state & (ERR_DISCONNECT | ERR_DISCONNECT_RECONNECT | ERR_DISCONNECTED | UNDEFINED))) { dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n", vscsi->state, vscsi->flags, rc); } ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); } return; } /* * The response queue is full. * If the server is processing SRP requests, i.e. * the client has successfully done an * SRP_LOGIN, then it will wait forever for room in * the queue. However if the system admin * is attempting to unconfigure the server then one * or more children will be in a state where * they are being removed. So if there is even one * child being removed then the driver assumes * the system admin is attempting to break the * connection with the client and MAX_TIMER_POPS * is honored. */ if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) || (vscsi->state == SRP_PROCESSING)) { dev_dbg(&vscsi->dev, "snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n", vscsi->flags, (int)vscsi->rsp_q_timer.started, vscsi->rsp_q_timer.timer_pops); /* * Check if the timer is running; if it * is not then start it up. */ if (!vscsi->rsp_q_timer.started) { if (vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) { kt = WAIT_NANO_SECONDS; } else { /* * slide the timeslice if the maximum * timer pops have already happened */ kt = ktime_set(WAIT_SECONDS, 0); } vscsi->rsp_q_timer.started = true; hrtimer_start(&vscsi->rsp_q_timer.timer, kt, HRTIMER_MODE_REL); } } else { /* * TBD: Do we need to worry about this? Need to get * remove working. */ /* * waited a long time and it appears the system admin * is bring this driver down */ vscsi->flags |= RESPONSE_Q_DOWN; ibmvscsis_free_cmd_qs(vscsi); /* * if the driver is already attempting to disconnect * from the client and has already logged an error * trace this event but don't put it in the error log */ if (!(vscsi->state & (ERR_DISCONNECT | ERR_DISCONNECT_RECONNECT | ERR_DISCONNECTED | UNDEFINED))) { dev_err(&vscsi->dev, "client crq full too long\n"); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); } } } /** * ibmvscsis_send_messages() - Send a Response * @vscsi: Pointer to our adapter structure * * Send a response, first checking the waiting queue. Responses are * sent in order they are received. If the response cannot be sent, * because the client queue is full, it stays on the waiting queue. * * PRECONDITION: * Called with interrupt lock held */ static void ibmvscsis_send_messages(struct scsi_info *vscsi) { u64 msg_hi = 0; /* note do not attempt to access the IU_data_ptr with this pointer * it is not valid */ struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi; struct ibmvscsis_cmd *cmd, *nxt; long rc = ADAPT_SUCCESS; bool retry = false; if (!(vscsi->flags & RESPONSE_Q_DOWN)) { do { retry = false; list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) { /* * Check to make sure abort cmd gets processed * prior to the abort tmr cmd */ if (cmd->flags & DELAY_SEND) continue; if (cmd->abort_cmd) { retry = true; cmd->abort_cmd->flags &= ~(DELAY_SEND); cmd->abort_cmd = NULL; } /* * If CMD_T_ABORTED w/o CMD_T_TAS scenarios and * the case where LIO issued a * ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST * case then we dont send a response, since it * was already done. */ if (cmd->se_cmd.transport_state & CMD_T_ABORTED && !(cmd->se_cmd.transport_state & CMD_T_TAS)) { list_del(&cmd->list); ibmvscsis_free_cmd_resources(vscsi, cmd); /* * With a successfully aborted op * through LIO we want to increment the * the vscsi credit so that when we dont * send a rsp to the original scsi abort * op (h_send_crq), but the tm rsp to * the abort is sent, the credit is * correctly sent with the abort tm rsp. * We would need 1 for the abort tm rsp * and 1 credit for the aborted scsi op. * Thus we need to increment here. * Also we want to increment the credit * here because we want to make sure * cmd is actually released first * otherwise the client will think it * it can send a new cmd, and we could * find ourselves short of cmd elements. */ vscsi->credit += 1; } else { crq->valid = VALID_CMD_RESP_EL; crq->format = cmd->rsp.format; if (cmd->flags & CMD_FAST_FAIL) crq->status = VIOSRP_ADAPTER_FAIL; crq->IU_length = cpu_to_be16(cmd->rsp.len); rc = h_send_crq(vscsi->dma_dev->unit_address, be64_to_cpu(msg_hi), be64_to_cpu(cmd->rsp.tag)); dev_dbg(&vscsi->dev, "send_messages: cmd %p, tag 0x%llx, rc %ld\n", cmd, be64_to_cpu(cmd->rsp.tag), rc); /* if all ok free up the command * element resources */ if (rc == H_SUCCESS) { /* some movement has occurred */ vscsi->rsp_q_timer.timer_pops = 0; list_del(&cmd->list); ibmvscsis_free_cmd_resources(vscsi, cmd); } else { srp_snd_msg_failed(vscsi, rc); break; } } } } while (retry); if (!rc) { /* * The timer could pop with the queue empty. If * this happens, rc will always indicate a * success; clear the pop count. */ vscsi->rsp_q_timer.timer_pops = 0; } } else { ibmvscsis_free_cmd_qs(vscsi); } } /* Called with intr lock held */ static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd, struct viosrp_crq *crq) { struct iu_entry *iue = cmd->iue; struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; uint flag_bits = 0; long rc; dma_wmb(); rc = h_copy_rdma(sizeof(struct mad_common), vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, be64_to_cpu(crq->IU_data_ptr)); if (!rc) { cmd->rsp.format = VIOSRP_MAD_FORMAT; cmd->rsp.len = sizeof(struct mad_common); cmd->rsp.tag = mad->tag; list_add_tail(&cmd->list, &vscsi->waiting_rsp); ibmvscsis_send_messages(vscsi); } else { dev_dbg(&vscsi->dev, "Error sending mad response, rc %ld\n", rc); if (rc == H_PERMISSION) { if (connection_broken(vscsi)) flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); } dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n", rc); ibmvscsis_free_cmd_resources(vscsi, cmd); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, flag_bits); } } /** * ibmvscsis_mad() - Service a MAnagement Data gram. * @vscsi: Pointer to our adapter structure * @crq: Pointer to the CRQ entry containing the MAD request * * EXECUTION ENVIRONMENT: * Interrupt, called with adapter lock held */ static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq) { struct iu_entry *iue; struct ibmvscsis_cmd *cmd; struct mad_common *mad; long rc = ADAPT_SUCCESS; switch (vscsi->state) { /* * We have not exchanged Init Msgs yet, so this MAD was sent * before the last Transport Event; client will not be * expecting a response. */ case WAIT_CONNECTION: dev_dbg(&vscsi->dev, "mad: in Wait Connection state, ignoring MAD, flags %d\n", vscsi->flags); return ADAPT_SUCCESS; case SRP_PROCESSING: case CONNECTED: break; /* * We should never get here while we're in these states. * Just log an error and get out. */ case UNCONFIGURING: case WAIT_IDLE: case ERR_DISCONNECT: case ERR_DISCONNECT_RECONNECT: default: dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n", vscsi->state); return ADAPT_SUCCESS; } cmd = ibmvscsis_get_free_cmd(vscsi); if (!cmd) { dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n", vscsi->debit); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); return ERROR; } iue = cmd->iue; cmd->type = ADAPTER_MAD; rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); if (!rc) { mad = (struct mad_common *)&vio_iu(iue)->mad; dev_dbg(&vscsi->dev, "mad: type %d\n", be32_to_cpu(mad->type)); rc = ibmvscsis_process_mad(vscsi, iue); dev_dbg(&vscsi->dev, "mad: status %hd, rc %ld\n", be16_to_cpu(mad->status), rc); if (!rc) ibmvscsis_send_mad_resp(vscsi, cmd, crq); } else { ibmvscsis_free_cmd_resources(vscsi, cmd); } dev_dbg(&vscsi->dev, "Leaving mad, rc %ld\n", rc); return rc; } /** * ibmvscsis_login_rsp() - Create/copy a login response notice to the client * @vscsi: Pointer to our adapter structure * @cmd: Pointer to the command for the SRP Login request * * EXECUTION ENVIRONMENT: * Interrupt, interrupt lock held */ static long ibmvscsis_login_rsp(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd) { struct iu_entry *iue = cmd->iue; struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp; struct format_code *fmt; uint flag_bits = 0; long rc = ADAPT_SUCCESS; memset(rsp, 0, sizeof(struct srp_login_rsp)); rsp->opcode = SRP_LOGIN_RSP; rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit); rsp->tag = cmd->rsp.tag; rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); fmt = (struct format_code *)&rsp->buf_fmt; fmt->buffers = SUPPORTED_FORMATS; vscsi->credit = 0; cmd->rsp.len = sizeof(struct srp_login_rsp); dma_wmb(); rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, be64_to_cpu(iue->remote_token)); switch (rc) { case H_SUCCESS: break; case H_PERMISSION: if (connection_broken(vscsi)) flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, flag_bits); break; case H_SOURCE_PARM: case H_DEST_PARM: default: dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; } return rc; } /** * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client * @vscsi: Pointer to our adapter structure * @cmd: Pointer to the command for the SRP Login request * @reason: The reason the SRP Login is being rejected, per SRP protocol * * EXECUTION ENVIRONMENT: * Interrupt, interrupt lock held */ static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd, u32 reason) { struct iu_entry *iue = cmd->iue; struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej; struct format_code *fmt; uint flag_bits = 0; long rc = ADAPT_SUCCESS; memset(rej, 0, sizeof(*rej)); rej->opcode = SRP_LOGIN_REJ; rej->reason = cpu_to_be32(reason); rej->tag = cmd->rsp.tag; fmt = (struct format_code *)&rej->buf_fmt; fmt->buffers = SUPPORTED_FORMATS; cmd->rsp.len = sizeof(*rej); dma_wmb(); rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, be64_to_cpu(iue->remote_token)); switch (rc) { case H_SUCCESS: break; case H_PERMISSION: if (connection_broken(vscsi)) flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, flag_bits); break; case H_SOURCE_PARM: case H_DEST_PARM: default: dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; } return rc; } static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport) { char *name = tport->tport_name; struct ibmvscsis_nexus *nexus; struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); int rc; if (tport->ibmv_nexus) { dev_dbg(&vscsi->dev, "tport->ibmv_nexus already exists\n"); return 0; } nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); if (!nexus) { dev_err(&vscsi->dev, "Unable to allocate struct ibmvscsis_nexus\n"); return -ENOMEM; } nexus->se_sess = target_setup_session(&tport->se_tpg, 0, 0, TARGET_PROT_NORMAL, name, nexus, NULL); if (IS_ERR(nexus->se_sess)) { rc = PTR_ERR(nexus->se_sess); goto transport_init_fail; } tport->ibmv_nexus = nexus; return 0; transport_init_fail: kfree(nexus); return rc; } static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport) { struct se_session *se_sess; struct ibmvscsis_nexus *nexus; nexus = tport->ibmv_nexus; if (!nexus) return -ENODEV; se_sess = nexus->se_sess; if (!se_sess) return -ENODEV; /* * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port */ target_remove_session(se_sess); tport->ibmv_nexus = NULL; kfree(nexus); return 0; } /** * ibmvscsis_srp_login() - Process an SRP Login Request * @vscsi: Pointer to our adapter structure * @cmd: Command element to use to process the SRP Login request * @crq: Pointer to CRQ entry containing the SRP Login request * * EXECUTION ENVIRONMENT: * Interrupt, called with interrupt lock held */ static long ibmvscsis_srp_login(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd, struct viosrp_crq *crq) { struct iu_entry *iue = cmd->iue; struct srp_login_req *req = &vio_iu(iue)->srp.login_req; struct port_id { __be64 id_extension; __be64 io_guid; } *iport, *tport; struct format_code *fmt; u32 reason = 0x0; long rc = ADAPT_SUCCESS; iport = (struct port_id *)req->initiator_port_id; tport = (struct port_id *)req->target_port_id; fmt = (struct format_code *)&req->req_buf_fmt; if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN) reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE; else if (be32_to_cpu(req->req_it_iu_len) < 64) reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) || (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1))) reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL; else if (req->req_flags & SRP_MULTICHAN_MULTI) reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED; else if (fmt->buffers & (~SUPPORTED_FORMATS)) reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; else if ((fmt->buffers & SUPPORTED_FORMATS) == 0) reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; if (vscsi->state == SRP_PROCESSING) reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED; rc = ibmvscsis_make_nexus(&vscsi->tport); if (rc) reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; cmd->rsp.format = VIOSRP_SRP_FORMAT; cmd->rsp.tag = req->tag; dev_dbg(&vscsi->dev, "srp_login: reason 0x%x\n", reason); if (reason) rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason); else rc = ibmvscsis_login_rsp(vscsi, cmd); if (!rc) { if (!reason) vscsi->state = SRP_PROCESSING; list_add_tail(&cmd->list, &vscsi->waiting_rsp); ibmvscsis_send_messages(vscsi); } else { ibmvscsis_free_cmd_resources(vscsi, cmd); } dev_dbg(&vscsi->dev, "Leaving srp_login, rc %ld\n", rc); return rc; } /** * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus * @vscsi: Pointer to our adapter structure * @cmd: Command element to use to process the Implicit Logout request * @crq: Pointer to CRQ entry containing the Implicit Logout request * * Do the logic to close the I_T nexus. This function may not * behave to specification. * * EXECUTION ENVIRONMENT: * Interrupt, interrupt lock held */ static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd, struct viosrp_crq *crq) { struct iu_entry *iue = cmd->iue; struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout; if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) || !list_empty(&vscsi->waiting_rsp)) { dev_err(&vscsi->dev, "i_logout: outstanding work\n"); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); } else { cmd->rsp.format = SRP_FORMAT; cmd->rsp.tag = log_out->tag; cmd->rsp.len = sizeof(struct mad_common); list_add_tail(&cmd->list, &vscsi->waiting_rsp); ibmvscsis_send_messages(vscsi); ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0); } return ADAPT_SUCCESS; } /* Called with intr lock held */ static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq) { struct ibmvscsis_cmd *cmd; struct iu_entry *iue; struct srp_cmd *srp; struct srp_tsk_mgmt *tsk; long rc; if (vscsi->request_limit - vscsi->debit <= 0) { /* Client has exceeded request limit */ dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n", vscsi->request_limit, vscsi->debit); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); return; } cmd = ibmvscsis_get_free_cmd(vscsi); if (!cmd) { dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n", vscsi->debit); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); return; } iue = cmd->iue; srp = &vio_iu(iue)->srp.cmd; rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); if (rc) { ibmvscsis_free_cmd_resources(vscsi, cmd); return; } if (vscsi->state == SRP_PROCESSING) { switch (srp->opcode) { case SRP_LOGIN_REQ: rc = ibmvscsis_srp_login(vscsi, cmd, crq); break; case SRP_TSK_MGMT: tsk = &vio_iu(iue)->srp.tsk_mgmt; dev_dbg(&vscsi->dev, "tsk_mgmt tag: %llu (0x%llx)\n", tsk->tag, tsk->tag); cmd->rsp.tag = tsk->tag; vscsi->debit += 1; cmd->type = TASK_MANAGEMENT; list_add_tail(&cmd->list, &vscsi->schedule_q); queue_work(vscsi->work_q, &cmd->work); break; case SRP_CMD: dev_dbg(&vscsi->dev, "srp_cmd tag: %llu (0x%llx)\n", srp->tag, srp->tag); cmd->rsp.tag = srp->tag; vscsi->debit += 1; cmd->type = SCSI_CDB; /* * We want to keep track of work waiting for * the workqueue. */ list_add_tail(&cmd->list, &vscsi->schedule_q); queue_work(vscsi->work_q, &cmd->work); break; case SRP_I_LOGOUT: rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq); break; case SRP_CRED_RSP: case SRP_AER_RSP: default: ibmvscsis_free_cmd_resources(vscsi, cmd); dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n", (uint)srp->opcode); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; } } else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) { rc = ibmvscsis_srp_login(vscsi, cmd, crq); } else { ibmvscsis_free_cmd_resources(vscsi, cmd); dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n", vscsi->state); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); } } /** * ibmvscsis_ping_response() - Respond to a ping request * @vscsi: Pointer to our adapter structure * * Let the client know that the server is alive and waiting on * its native I/O stack. * If any type of error occurs from the call to queue a ping * response then the client is either not accepting or receiving * interrupts. Disconnect with an error. * * EXECUTION ENVIRONMENT: * Interrupt, interrupt lock held */ static long ibmvscsis_ping_response(struct scsi_info *vscsi) { struct viosrp_crq *crq; u64 buffer[2] = { 0, 0 }; long rc; crq = (struct viosrp_crq *)&buffer; crq->valid = VALID_CMD_RESP_EL; crq->format = (u8)MESSAGE_IN_CRQ; crq->status = PING_RESPONSE; rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), cpu_to_be64(buffer[MSG_LOW])); switch (rc) { case H_SUCCESS: break; case H_CLOSED: vscsi->flags |= CLIENT_FAILED; /* Fall through */ case H_DROPPED: vscsi->flags |= RESPONSE_Q_DOWN; /* Fall through */ case H_REMOTE_PARM: dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; default: dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n", rc); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); break; } return rc; } /** * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue. * @vscsi: Pointer to our adapter structure * @crq: Pointer to CRQ element containing the SRP request * * This function will return success if the command queue element is valid * and the srp iu or MAD request it pointed to was also valid. That does * not mean that an error was not returned to the client. * * EXECUTION ENVIRONMENT: * Interrupt, intr lock held */ static long ibmvscsis_parse_command(struct scsi_info *vscsi, struct viosrp_crq *crq) { long rc = ADAPT_SUCCESS; switch (crq->valid) { case VALID_CMD_RESP_EL: switch (crq->format) { case OS400_FORMAT: case AIX_FORMAT: case LINUX_FORMAT: case MAD_FORMAT: if (vscsi->flags & PROCESSING_MAD) { rc = ERROR; dev_err(&vscsi->dev, "parse_command: already processing mad\n"); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); } else { vscsi->flags |= PROCESSING_MAD; rc = ibmvscsis_mad(vscsi, crq); } break; case SRP_FORMAT: ibmvscsis_srp_cmd(vscsi, crq); break; case MESSAGE_IN_CRQ: if (crq->status == PING) ibmvscsis_ping_response(vscsi); break; default: dev_err(&vscsi->dev, "parse_command: invalid format %d\n", (uint)crq->format); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; } break; case VALID_TRANS_EVENT: rc = ibmvscsis_trans_event(vscsi, crq); break; case VALID_INIT_MSG: rc = ibmvscsis_init_msg(vscsi, crq); break; default: dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n", (uint)crq->valid); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); break; } /* * Return only what the interrupt handler cares * about. Most errors we keep right on trucking. */ rc = vscsi->flags & SCHEDULE_DISCONNECT; return rc; } static int read_dma_window(struct scsi_info *vscsi) { struct vio_dev *vdev = vscsi->dma_dev; const __be32 *dma_window; const __be32 *prop; /* TODO Using of_parse_dma_window would be better, but it doesn't give * a way to read multiple windows without already knowing the size of * a window or the number of windows. */ dma_window = (const __be32 *)vio_get_attribute(vdev, "ibm,my-dma-window", NULL); if (!dma_window) { dev_err(&vscsi->dev, "Couldn't find ibm,my-dma-window property\n"); return -1; } vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window); dma_window++; prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells", NULL); if (!prop) { dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-address-cells property\n"); dma_window++; } else { dma_window += be32_to_cpu(*prop); } prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells", NULL); if (!prop) { dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-size-cells property\n"); dma_window++; } else { dma_window += be32_to_cpu(*prop); } /* dma_window should point to the second window now */ vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window); return 0; } static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name) { struct ibmvscsis_tport *tport = NULL; struct vio_dev *vdev; struct scsi_info *vscsi; spin_lock_bh(&ibmvscsis_dev_lock); list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) { vdev = vscsi->dma_dev; if (!strcmp(dev_name(&vdev->dev), name)) { tport = &vscsi->tport; break; } } spin_unlock_bh(&ibmvscsis_dev_lock); return tport; } /** * ibmvscsis_parse_cmd() - Parse SRP Command * @vscsi: Pointer to our adapter structure * @cmd: Pointer to command element with SRP command * * Parse the srp command; if it is valid then submit it to tcm. * Note: The return code does not reflect the status of the SCSI CDB. * * EXECUTION ENVIRONMENT: * Process level */ static void ibmvscsis_parse_cmd(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd) { struct iu_entry *iue = cmd->iue; struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; struct ibmvscsis_nexus *nexus; u64 data_len = 0; enum dma_data_direction dir; int attr = 0; int rc = 0; nexus = vscsi->tport.ibmv_nexus; /* * additional length in bytes. Note that the SRP spec says that * additional length is in 4-byte words, but technically the * additional length field is only the upper 6 bits of the byte. * The lower 2 bits are reserved. If the lower 2 bits are 0 (as * all reserved fields should be), then interpreting the byte as * an int will yield the length in bytes. */ if (srp->add_cdb_len & 0x03) { dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n"); spin_lock_bh(&vscsi->intr_lock); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); ibmvscsis_free_cmd_resources(vscsi, cmd); spin_unlock_bh(&vscsi->intr_lock); return; } if (srp_get_desc_table(srp, &dir, &data_len)) { dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n", srp->tag); goto fail; } cmd->rsp.sol_not = srp->sol_not; switch (srp->task_attr) { case SRP_SIMPLE_TASK: attr = TCM_SIMPLE_TAG; break; case SRP_ORDERED_TASK: attr = TCM_ORDERED_TAG; break; case SRP_HEAD_TASK: attr = TCM_HEAD_TAG; break; case SRP_ACA_TASK: attr = TCM_ACA_TAG; break; default: dev_err(&vscsi->dev, "Invalid task attribute %d\n", srp->task_attr); goto fail; } cmd->se_cmd.tag = be64_to_cpu(srp->tag); spin_lock_bh(&vscsi->intr_lock); list_add_tail(&cmd->list, &vscsi->active_q); spin_unlock_bh(&vscsi->intr_lock); srp->lun.scsi_lun[0] &= 0x3f; rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb, cmd->sense_buf, scsilun_to_int(&srp->lun), data_len, attr, dir, 0); if (rc) { dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc); spin_lock_bh(&vscsi->intr_lock); list_del(&cmd->list); ibmvscsis_free_cmd_resources(vscsi, cmd); spin_unlock_bh(&vscsi->intr_lock); goto fail; } return; fail: spin_lock_bh(&vscsi->intr_lock); ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); spin_unlock_bh(&vscsi->intr_lock); } /** * ibmvscsis_parse_task() - Parse SRP Task Management Request * @vscsi: Pointer to our adapter structure * @cmd: Pointer to command element with SRP task management request * * Parse the srp task management request; if it is valid then submit it to tcm. * Note: The return code does not reflect the status of the task management * request. * * EXECUTION ENVIRONMENT: * Processor level */ static void ibmvscsis_parse_task(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd) { struct iu_entry *iue = cmd->iue; struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt; int tcm_type; u64 tag_to_abort = 0; int rc = 0; struct ibmvscsis_nexus *nexus; nexus = vscsi->tport.ibmv_nexus; cmd->rsp.sol_not = srp_tsk->sol_not; switch (srp_tsk->tsk_mgmt_func) { case SRP_TSK_ABORT_TASK: tcm_type = TMR_ABORT_TASK; tag_to_abort = be64_to_cpu(srp_tsk->task_tag); break; case SRP_TSK_ABORT_TASK_SET: tcm_type = TMR_ABORT_TASK_SET; break; case SRP_TSK_CLEAR_TASK_SET: tcm_type = TMR_CLEAR_TASK_SET; break; case SRP_TSK_LUN_RESET: tcm_type = TMR_LUN_RESET; break; case SRP_TSK_CLEAR_ACA: tcm_type = TMR_CLEAR_ACA; break; default: dev_err(&vscsi->dev, "unknown task mgmt func %d\n", srp_tsk->tsk_mgmt_func); cmd->se_cmd.se_tmr_req->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; rc = -1; break; } if (!rc) { cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag); spin_lock_bh(&vscsi->intr_lock); list_add_tail(&cmd->list, &vscsi->active_q); spin_unlock_bh(&vscsi->intr_lock); srp_tsk->lun.scsi_lun[0] &= 0x3f; dev_dbg(&vscsi->dev, "calling submit_tmr, func %d\n", srp_tsk->tsk_mgmt_func); rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL, scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_type, GFP_KERNEL, tag_to_abort, 0); if (rc) { dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n", rc); spin_lock_bh(&vscsi->intr_lock); list_del(&cmd->list); spin_unlock_bh(&vscsi->intr_lock); cmd->se_cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED; } } if (rc) transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0); } static void ibmvscsis_scheduler(struct work_struct *work) { struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd, work); struct scsi_info *vscsi = cmd->adapter; spin_lock_bh(&vscsi->intr_lock); /* Remove from schedule_q */ list_del(&cmd->list); /* Don't submit cmd if we're disconnecting */ if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) { ibmvscsis_free_cmd_resources(vscsi, cmd); /* ibmvscsis_disconnect might be waiting for us */ if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) && (vscsi->flags & WAIT_FOR_IDLE)) { vscsi->flags &= ~WAIT_FOR_IDLE; complete(&vscsi->wait_idle); } spin_unlock_bh(&vscsi->intr_lock); return; } spin_unlock_bh(&vscsi->intr_lock); switch (cmd->type) { case SCSI_CDB: ibmvscsis_parse_cmd(vscsi, cmd); break; case TASK_MANAGEMENT: ibmvscsis_parse_task(vscsi, cmd); break; default: dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n", cmd->type); spin_lock_bh(&vscsi->intr_lock); ibmvscsis_free_cmd_resources(vscsi, cmd); spin_unlock_bh(&vscsi->intr_lock); break; } } static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num) { struct ibmvscsis_cmd *cmd; int i; INIT_LIST_HEAD(&vscsi->free_cmd); vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd), GFP_KERNEL); if (!vscsi->cmd_pool) return -ENOMEM; for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num; i++, cmd++) { cmd->abort_cmd = NULL; cmd->adapter = vscsi; INIT_WORK(&cmd->work, ibmvscsis_scheduler); list_add_tail(&cmd->list, &vscsi->free_cmd); } return 0; } static void ibmvscsis_free_cmds(struct scsi_info *vscsi) { kfree(vscsi->cmd_pool); vscsi->cmd_pool = NULL; INIT_LIST_HEAD(&vscsi->free_cmd); } /** * ibmvscsis_service_wait_q() - Service Waiting Queue * @timer: Pointer to timer which has expired * * This routine is called when the timer pops to service the waiting * queue. Elements on the queue have completed, their responses have been * copied to the client, but the client's response queue was full so * the queue message could not be sent. The routine grabs the proper locks * and calls send messages. * * EXECUTION ENVIRONMENT: * called at interrupt level */ static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer) { struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer); struct scsi_info *vscsi = container_of(p_timer, struct scsi_info, rsp_q_timer); spin_lock_bh(&vscsi->intr_lock); p_timer->timer_pops += 1; p_timer->started = false; ibmvscsis_send_messages(vscsi); spin_unlock_bh(&vscsi->intr_lock); return HRTIMER_NORESTART; } static long ibmvscsis_alloctimer(struct scsi_info *vscsi) { struct timer_cb *p_timer; p_timer = &vscsi->rsp_q_timer; hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); p_timer->timer.function = ibmvscsis_service_wait_q; p_timer->started = false; p_timer->timer_pops = 0; return ADAPT_SUCCESS; } static void ibmvscsis_freetimer(struct scsi_info *vscsi) { struct timer_cb *p_timer; p_timer = &vscsi->rsp_q_timer; (void)hrtimer_cancel(&p_timer->timer); p_timer->started = false; p_timer->timer_pops = 0; } static irqreturn_t ibmvscsis_interrupt(int dummy, void *data) { struct scsi_info *vscsi = data; vio_disable_interrupts(vscsi->dma_dev); tasklet_schedule(&vscsi->work_task); return IRQ_HANDLED; } /** * ibmvscsis_enable_change_state() - Set new state based on enabled status * @vscsi: Pointer to our adapter structure * * This function determines our new state now that we are enabled. This * may involve sending an Init Complete message to the client. * * Must be called with interrupt lock held. */ static long ibmvscsis_enable_change_state(struct scsi_info *vscsi) { int bytes; long rc = ADAPT_SUCCESS; bytes = vscsi->cmd_q.size * PAGE_SIZE; rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes); if (rc == H_CLOSED || rc == H_SUCCESS) { vscsi->state = WAIT_CONNECTION; rc = ibmvscsis_establish_new_q(vscsi); } if (rc != ADAPT_SUCCESS) { vscsi->state = ERR_DISCONNECTED; vscsi->flags |= RESPONSE_Q_DOWN; } return rc; } /** * ibmvscsis_create_command_q() - Create Command Queue * @vscsi: Pointer to our adapter structure * @num_cmds: Currently unused. In the future, may be used to determine * the size of the CRQ. * * Allocates memory for command queue maps remote memory into an ioba * initializes the command response queue * * EXECUTION ENVIRONMENT: * Process level only */ static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds) { int pages; struct vio_dev *vdev = vscsi->dma_dev; /* We might support multiple pages in the future, but just 1 for now */ pages = 1; vscsi->cmd_q.size = pages; vscsi->cmd_q.base_addr = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); if (!vscsi->cmd_q.base_addr) return -ENOMEM; vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1; vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev, vscsi->cmd_q.base_addr, PAGE_SIZE, DMA_BIDIRECTIONAL); if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) { free_page((unsigned long)vscsi->cmd_q.base_addr); return -ENOMEM; } return 0; } /** * ibmvscsis_destroy_command_q - Destroy Command Queue * @vscsi: Pointer to our adapter structure * * Releases memory for command queue and unmaps mapped remote memory. * * EXECUTION ENVIRONMENT: * Process level only */ static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi) { dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token, PAGE_SIZE, DMA_BIDIRECTIONAL); free_page((unsigned long)vscsi->cmd_q.base_addr); vscsi->cmd_q.base_addr = NULL; vscsi->state = NO_QUEUE; } static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd) { struct iu_entry *iue = cmd->iue; struct se_cmd *se_cmd = &cmd->se_cmd; struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; struct scsi_sense_hdr sshdr; u8 rc = se_cmd->scsi_status; if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb))) if (scsi_normalize_sense(se_cmd->sense_buffer, se_cmd->scsi_sense_length, &sshdr)) if (sshdr.sense_key == HARDWARE_ERROR && (se_cmd->residual_count == 0 || se_cmd->residual_count == se_cmd->data_length)) { rc = NO_SENSE; cmd->flags |= CMD_FAST_FAIL; } return rc; } /** * srp_build_response() - Build an SRP response buffer * @vscsi: Pointer to our adapter structure * @cmd: Pointer to command for which to send the response * @len_p: Where to return the length of the IU response sent. This * is needed to construct the CRQ response. * * Build the SRP response buffer and copy it to the client's memory space. */ static long srp_build_response(struct scsi_info *vscsi, struct ibmvscsis_cmd *cmd, uint *len_p) { struct iu_entry *iue = cmd->iue; struct se_cmd *se_cmd = &cmd->se_cmd; struct srp_rsp *rsp; uint len; u32 rsp_code; char *data; u32 *tsk_status; long rc = ADAPT_SUCCESS; spin_lock_bh(&vscsi->intr_lock); rsp = &vio_iu(iue)->srp.rsp; len = sizeof(*rsp); memset(rsp, 0, len); data = rsp->data; rsp->opcode = SRP_RSP; rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit); rsp->tag = cmd->rsp.tag; rsp->flags = 0; if (cmd->type == SCSI_CDB) { rsp->status = ibmvscsis_fast_fail(vscsi, cmd); if (rsp->status) { dev_dbg(&vscsi->dev, "build_resp: cmd %p, scsi status %d\n", cmd, (int)rsp->status); ibmvscsis_determine_resid(se_cmd, rsp); if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) { rsp->sense_data_len = cpu_to_be32(se_cmd->scsi_sense_length); rsp->flags |= SRP_RSP_FLAG_SNSVALID; len += se_cmd->scsi_sense_length; memcpy(data, se_cmd->sense_buffer, se_cmd->scsi_sense_length); } rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> UCSOLNT_RESP_SHIFT; } else if (cmd->flags & CMD_FAST_FAIL) { dev_dbg(&vscsi->dev, "build_resp: cmd %p, fast fail\n", cmd); rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> UCSOLNT_RESP_SHIFT; } else { rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> SCSOLNT_RESP_SHIFT; } } else { /* this is task management */ rsp->status = 0; rsp->resp_data_len = cpu_to_be32(4); rsp->flags |= SRP_RSP_FLAG_RSPVALID; switch (se_cmd->se_tmr_req->response) { case TMR_FUNCTION_COMPLETE: case TMR_TASK_DOES_NOT_EXIST: rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE; rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> SCSOLNT_RESP_SHIFT; break; case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: case TMR_LUN_DOES_NOT_EXIST: rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED; rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> UCSOLNT_RESP_SHIFT; break; case TMR_FUNCTION_FAILED: case TMR_FUNCTION_REJECTED: default: rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED; rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> UCSOLNT_RESP_SHIFT; break; } tsk_status = (u32 *)data; *tsk_status = cpu_to_be32(rsp_code); data = (char *)(tsk_status + 1); len += 4; } dma_wmb(); rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, be64_to_cpu(iue->remote_token)); switch (rc) { case H_SUCCESS: vscsi->credit = 0; *len_p = len; break; case H_PERMISSION: if (connection_broken(vscsi)) vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED; dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n", rc, vscsi->flags, vscsi->state); break; case H_SOURCE_PARM: case H_DEST_PARM: default: dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n", rc); break; } spin_unlock_bh(&vscsi->intr_lock); return rc; } static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg, int nsg, struct srp_direct_buf *md, int nmd, enum dma_data_direction dir, unsigned int bytes) { struct iu_entry *iue = cmd->iue; struct srp_target *target = iue->target; struct scsi_info *vscsi = target->ldata; struct scatterlist *sgp; dma_addr_t client_ioba, server_ioba; ulong buf_len; ulong client_len, server_len; int md_idx; long tx_len; long rc = 0; if (bytes == 0) return 0; sgp = sg; client_len = 0; server_len = 0; md_idx = 0; tx_len = bytes; do { if (client_len == 0) { if (md_idx >= nmd) { dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n"); rc = -EIO; break; } client_ioba = be64_to_cpu(md[md_idx].va); client_len = be32_to_cpu(md[md_idx].len); } if (server_len == 0) { if (!sgp) { dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n"); rc = -EIO; break; } server_ioba = sg_dma_address(sgp); server_len = sg_dma_len(sgp); } buf_len = tx_len; if (buf_len > client_len) buf_len = client_len; if (buf_len > server_len) buf_len = server_len; if (buf_len > max_vdma_size) buf_len = max_vdma_size; if (dir == DMA_TO_DEVICE) { /* read from client */ rc = h_copy_rdma(buf_len, vscsi->dds.window[REMOTE].liobn, client_ioba, vscsi->dds.window[LOCAL].liobn, server_ioba); } else { /* The h_copy_rdma will cause phyp, running in another * partition, to read memory, so we need to make sure * the data has been written out, hence these syncs. */ /* ensure that everything is in memory */ isync(); /* ensure that memory has been made visible */ dma_wmb(); rc = h_copy_rdma(buf_len, vscsi->dds.window[LOCAL].liobn, server_ioba, vscsi->dds.window[REMOTE].liobn, client_ioba); } switch (rc) { case H_SUCCESS: break; case H_PERMISSION: case H_SOURCE_PARM: case H_DEST_PARM: if (connection_broken(vscsi)) { spin_lock_bh(&vscsi->intr_lock); vscsi->flags |= (RESPONSE_Q_DOWN | CLIENT_FAILED); spin_unlock_bh(&vscsi->intr_lock); } dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n", rc); break; default: dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n", rc); break; } if (!rc) { tx_len -= buf_len; if (tx_len) { client_len -= buf_len; if (client_len == 0) md_idx++; else client_ioba += buf_len; server_len -= buf_len; if (server_len == 0) sgp = sg_next(sgp); else server_ioba += buf_len; } else { break; } } } while (!rc); return rc; } /** * ibmvscsis_handle_crq() - Handle CRQ * @data: Pointer to our adapter structure * * Read the command elements from the command queue and copy the payloads * associated with the command elements to local memory and execute the * SRP requests. * * Note: this is an edge triggered interrupt. It can not be shared. */ static void ibmvscsis_handle_crq(unsigned long data) { struct scsi_info *vscsi = (struct scsi_info *)data; struct viosrp_crq *crq; long rc; bool ack = true; volatile u8 valid; spin_lock_bh(&vscsi->intr_lock); dev_dbg(&vscsi->dev, "got interrupt\n"); /* * if we are in a path where we are waiting for all pending commands * to complete because we received a transport event and anything in * the command queue is for a new connection, do nothing */ if (TARGET_STOP(vscsi)) { vio_enable_interrupts(vscsi->dma_dev); dev_dbg(&vscsi->dev, "handle_crq, don't process: flags 0x%x, state 0x%hx\n", vscsi->flags, vscsi->state); spin_unlock_bh(&vscsi->intr_lock); return; } rc = vscsi->flags & SCHEDULE_DISCONNECT; crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; valid = crq->valid; dma_rmb(); while (valid) { /* * These are edege triggered interrupts. After dropping out of * the while loop, the code must check for work since an * interrupt could be lost, and an elment be left on the queue, * hence the label. */ cmd_work: vscsi->cmd_q.index = (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; if (!rc) { rc = ibmvscsis_parse_command(vscsi, crq); } else { if ((uint)crq->valid == VALID_TRANS_EVENT) { /* * must service the transport layer events even * in an error state, dont break out until all * the consecutive transport events have been * processed */ rc = ibmvscsis_trans_event(vscsi, crq); } else if (vscsi->flags & TRANS_EVENT) { /* * if a transport event has occurred leave * everything but transport events on the queue * * need to decrement the queue index so we can * look at the element again */ if (vscsi->cmd_q.index) vscsi->cmd_q.index -= 1; else /* * index is at 0 it just wrapped. * have it index last element in q */ vscsi->cmd_q.index = vscsi->cmd_q.mask; break; } } crq->valid = INVALIDATE_CMD_RESP_EL; crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; valid = crq->valid; dma_rmb(); } if (!rc) { if (ack) { vio_enable_interrupts(vscsi->dma_dev); ack = false; dev_dbg(&vscsi->dev, "handle_crq, reenabling interrupts\n"); } valid = crq->valid; dma_rmb(); if (valid) goto cmd_work; } else { dev_dbg(&vscsi->dev, "handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n", vscsi->flags, vscsi->state, vscsi->cmd_q.index); } dev_dbg(&vscsi->dev, "Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n", (int)list_empty(&vscsi->schedule_q), vscsi->flags, vscsi->state); spin_unlock_bh(&vscsi->intr_lock); } static int ibmvscsis_probe(struct vio_dev *vdev, const struct vio_device_id *id) { struct scsi_info *vscsi; int rc = 0; long hrc = 0; char wq_name[24]; vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL); if (!vscsi) { rc = -ENOMEM; dev_err(&vdev->dev, "probe: allocation of adapter failed\n"); return rc; } vscsi->dma_dev = vdev; vscsi->dev = vdev->dev; INIT_LIST_HEAD(&vscsi->schedule_q); INIT_LIST_HEAD(&vscsi->waiting_rsp); INIT_LIST_HEAD(&vscsi->active_q); snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s", dev_name(&vdev->dev)); dev_dbg(&vscsi->dev, "probe tport_name: %s\n", vscsi->tport.tport_name); rc = read_dma_window(vscsi); if (rc) goto free_adapter; dev_dbg(&vscsi->dev, "Probe: liobn 0x%x, riobn 0x%x\n", vscsi->dds.window[LOCAL].liobn, vscsi->dds.window[REMOTE].liobn); snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name); vscsi->dds.unit_id = vdev->unit_address; strscpy(vscsi->dds.partition_name, partition_name, sizeof(vscsi->dds.partition_name)); vscsi->dds.partition_num = partition_number; spin_lock_bh(&ibmvscsis_dev_lock); list_add_tail(&vscsi->list, &ibmvscsis_dev_list); spin_unlock_bh(&ibmvscsis_dev_lock); /* * TBD: How do we determine # of cmds to request? Do we know how * many "children" we have? */ vscsi->request_limit = INITIAL_SRP_LIMIT; rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit, SRP_MAX_IU_LEN); if (rc) goto rem_list; vscsi->target.ldata = vscsi; rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit); if (rc) { dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n", rc, vscsi->request_limit); goto free_target; } /* * Note: the lock is used in freeing timers, so must initialize * first so that ordering in case of error is correct. */ spin_lock_init(&vscsi->intr_lock); rc = ibmvscsis_alloctimer(vscsi); if (rc) { dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc); goto free_cmds; } rc = ibmvscsis_create_command_q(vscsi, 256); if (rc) { dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n", rc); goto free_timer; } vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); if (!vscsi->map_buf) { rc = -ENOMEM; dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n"); goto destroy_queue; } vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE, DMA_BIDIRECTIONAL); if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) { rc = -ENOMEM; dev_err(&vscsi->dev, "probe: error mapping command buffer\n"); goto free_buf; } hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, 0); if (hrc == H_SUCCESS) vscsi->client_data.partition_number = be64_to_cpu(*(u64 *)vscsi->map_buf); /* * We expect the VIOCTL to fail if we're configured as "any * client can connect" and the client isn't activated yet. * We'll make the call again when he sends an init msg. */ dev_dbg(&vscsi->dev, "probe hrc %ld, client partition num %d\n", hrc, vscsi->client_data.partition_number); tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq, (unsigned long)vscsi); init_completion(&vscsi->wait_idle); init_completion(&vscsi->unconfig); snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev)); vscsi->work_q = create_workqueue(wq_name); if (!vscsi->work_q) { rc = -ENOMEM; dev_err(&vscsi->dev, "create_workqueue failed\n"); goto unmap_buf; } rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi); if (rc) { rc = -EPERM; dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc); goto destroy_WQ; } vscsi->state = WAIT_ENABLED; dev_set_drvdata(&vdev->dev, vscsi); return 0; destroy_WQ: destroy_workqueue(vscsi->work_q); unmap_buf: dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, DMA_BIDIRECTIONAL); free_buf: kfree(vscsi->map_buf); destroy_queue: tasklet_kill(&vscsi->work_task); ibmvscsis_unregister_command_q(vscsi); ibmvscsis_destroy_command_q(vscsi); free_timer: ibmvscsis_freetimer(vscsi); free_cmds: ibmvscsis_free_cmds(vscsi); free_target: srp_target_free(&vscsi->target); rem_list: spin_lock_bh(&ibmvscsis_dev_lock); list_del(&vscsi->list); spin_unlock_bh(&ibmvscsis_dev_lock); free_adapter: kfree(vscsi); return rc; } static int ibmvscsis_remove(struct vio_dev *vdev) { struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev); dev_dbg(&vscsi->dev, "remove (%s)\n", dev_name(&vscsi->dma_dev->dev)); spin_lock_bh(&vscsi->intr_lock); ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0); vscsi->flags |= CFG_SLEEPING; spin_unlock_bh(&vscsi->intr_lock); wait_for_completion(&vscsi->unconfig); vio_disable_interrupts(vdev); free_irq(vdev->irq, vscsi); destroy_workqueue(vscsi->work_q); dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, DMA_BIDIRECTIONAL); kfree(vscsi->map_buf); tasklet_kill(&vscsi->work_task); ibmvscsis_destroy_command_q(vscsi); ibmvscsis_freetimer(vscsi); ibmvscsis_free_cmds(vscsi); srp_target_free(&vscsi->target); spin_lock_bh(&ibmvscsis_dev_lock); list_del(&vscsi->list); spin_unlock_bh(&ibmvscsis_dev_lock); kfree(vscsi); return 0; } static ssize_t system_id_show(struct device *dev, struct device_attribute *attr, char *buf) { return snprintf(buf, PAGE_SIZE, "%s\n", system_id); } static ssize_t partition_number_show(struct device *dev, struct device_attribute *attr, char *buf) { return snprintf(buf, PAGE_SIZE, "%x\n", partition_number); } static ssize_t unit_address_show(struct device *dev, struct device_attribute *attr, char *buf) { struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev); return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address); } static int ibmvscsis_get_system_info(void) { struct device_node *rootdn, *vdevdn; const char *id, *model, *name; const uint *num; rootdn = of_find_node_by_path("/"); if (!rootdn) return -ENOENT; model = of_get_property(rootdn, "model", NULL); id = of_get_property(rootdn, "system-id", NULL); if (model && id) snprintf(system_id, sizeof(system_id), "%s-%s", model, id); name = of_get_property(rootdn, "ibm,partition-name", NULL); if (name) strncpy(partition_name, name, sizeof(partition_name)); num = of_get_property(rootdn, "ibm,partition-no", NULL); if (num) partition_number = of_read_number(num, 1); of_node_put(rootdn); vdevdn = of_find_node_by_path("/vdevice"); if (vdevdn) { const uint *mvds; mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size", NULL); if (mvds) max_vdma_size = *mvds; of_node_put(vdevdn); } return 0; } static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg) { struct ibmvscsis_tport *tport = container_of(se_tpg, struct ibmvscsis_tport, se_tpg); return tport->tport_name; } static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg) { struct ibmvscsis_tport *tport = container_of(se_tpg, struct ibmvscsis_tport, se_tpg); return tport->tport_tpgt; } static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg) { return 1; } static int ibmvscsis_check_true(struct se_portal_group *se_tpg) { return 1; } static int ibmvscsis_check_false(struct se_portal_group *se_tpg) { return 0; } static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg) { return 1; } static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd) { return target_put_sess_cmd(se_cmd); } static void ibmvscsis_release_cmd(struct se_cmd *se_cmd) { struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, se_cmd); struct scsi_info *vscsi = cmd->adapter; spin_lock_bh(&vscsi->intr_lock); /* Remove from active_q */ list_move_tail(&cmd->list, &vscsi->waiting_rsp); ibmvscsis_send_messages(vscsi); spin_unlock_bh(&vscsi->intr_lock); } static u32 ibmvscsis_sess_get_index(struct se_session *se_sess) { return 0; } static int ibmvscsis_write_pending(struct se_cmd *se_cmd) { struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, se_cmd); struct scsi_info *vscsi = cmd->adapter; struct iu_entry *iue = cmd->iue; int rc; /* * If CLIENT_FAILED OR RESPONSE_Q_DOWN, then just return success * since LIO can't do anything about it, and we dont want to * attempt an srp_transfer_data. */ if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) { dev_err(&vscsi->dev, "write_pending failed since: %d\n", vscsi->flags); return -EIO; } rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1, 1); if (rc) { dev_err(&vscsi->dev, "srp_transfer_data() failed: %d\n", rc); return -EIO; } /* * We now tell TCM to add this WRITE CDB directly into the TCM storage * object execution queue. */ target_execute_cmd(se_cmd); return 0; } static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl) { } static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd) { return 0; } static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd) { struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, se_cmd); struct iu_entry *iue = cmd->iue; struct scsi_info *vscsi = cmd->adapter; uint len = 0; int rc; rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1, 1); if (rc) { dev_err(&vscsi->dev, "srp_transfer_data failed: %d\n", rc); se_cmd->scsi_sense_length = 18; memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length); /* Logical Unit Communication Time-out asc/ascq = 0x0801 */ scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR, 0x08, 0x01); } srp_build_response(vscsi, cmd, &len); cmd->rsp.format = SRP_FORMAT; cmd->rsp.len = len; return 0; } static int ibmvscsis_queue_status(struct se_cmd *se_cmd) { struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, se_cmd); struct scsi_info *vscsi = cmd->adapter; uint len; dev_dbg(&vscsi->dev, "queue_status %p\n", se_cmd); srp_build_response(vscsi, cmd, &len); cmd->rsp.format = SRP_FORMAT; cmd->rsp.len = len; return 0; } static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd) { struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, se_cmd); struct scsi_info *vscsi = cmd->adapter; struct ibmvscsis_cmd *cmd_itr; struct iu_entry *iue = iue = cmd->iue; struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt; u64 tag_to_abort = be64_to_cpu(srp_tsk->task_tag); uint len; dev_dbg(&vscsi->dev, "queue_tm_rsp %p, status %d\n", se_cmd, (int)se_cmd->se_tmr_req->response); if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK && cmd->se_cmd.se_tmr_req->response == TMR_TASK_DOES_NOT_EXIST) { spin_lock_bh(&vscsi->intr_lock); list_for_each_entry(cmd_itr, &vscsi->active_q, list) { if (tag_to_abort == cmd_itr->se_cmd.tag) { cmd_itr->abort_cmd = cmd; cmd->flags |= DELAY_SEND; break; } } spin_unlock_bh(&vscsi->intr_lock); } srp_build_response(vscsi, cmd, &len); cmd->rsp.format = SRP_FORMAT; cmd->rsp.len = len; } static void ibmvscsis_aborted_task(struct se_cmd *se_cmd) { struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, se_cmd); struct scsi_info *vscsi = cmd->adapter; dev_dbg(&vscsi->dev, "ibmvscsis_aborted_task %p task_tag: %llu\n", se_cmd, se_cmd->tag); } static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf, struct config_group *group, const char *name) { struct ibmvscsis_tport *tport; struct scsi_info *vscsi; tport = ibmvscsis_lookup_port(name); if (tport) { vscsi = container_of(tport, struct scsi_info, tport); tport->tport_proto_id = SCSI_PROTOCOL_SRP; dev_dbg(&vscsi->dev, "make_tport(%s), pointer:%p, tport_id:%x\n", name, tport, tport->tport_proto_id); return &tport->tport_wwn; } return ERR_PTR(-EINVAL); } static void ibmvscsis_drop_tport(struct se_wwn *wwn) { struct ibmvscsis_tport *tport = container_of(wwn, struct ibmvscsis_tport, tport_wwn); struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); dev_dbg(&vscsi->dev, "drop_tport(%s)\n", config_item_name(&tport->tport_wwn.wwn_group.cg_item)); } static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn, const char *name) { struct ibmvscsis_tport *tport = container_of(wwn, struct ibmvscsis_tport, tport_wwn); u16 tpgt; int rc; if (strstr(name, "tpgt_") != name) return ERR_PTR(-EINVAL); rc = kstrtou16(name + 5, 0, &tpgt); if (rc) return ERR_PTR(rc); tport->tport_tpgt = tpgt; tport->releasing = false; rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg, tport->tport_proto_id); if (rc) return ERR_PTR(rc); return &tport->se_tpg; } static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg) { struct ibmvscsis_tport *tport = container_of(se_tpg, struct ibmvscsis_tport, se_tpg); tport->releasing = true; tport->enabled = false; /* * Release the virtual I_T Nexus for this ibmvscsis TPG */ ibmvscsis_drop_nexus(tport); /* * Deregister the se_tpg from TCM.. */ core_tpg_deregister(se_tpg); } static ssize_t ibmvscsis_wwn_version_show(struct config_item *item, char *page) { return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION); } CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version); static struct configfs_attribute *ibmvscsis_wwn_attrs[] = { &ibmvscsis_wwn_attr_version, NULL, }; static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item, char *page) { struct se_portal_group *se_tpg = to_tpg(item); struct ibmvscsis_tport *tport = container_of(se_tpg, struct ibmvscsis_tport, se_tpg); return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0); } static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item, const char *page, size_t count) { struct se_portal_group *se_tpg = to_tpg(item); struct ibmvscsis_tport *tport = container_of(se_tpg, struct ibmvscsis_tport, se_tpg); struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); unsigned long tmp; int rc; long lrc; rc = kstrtoul(page, 0, &tmp); if (rc < 0) { dev_err(&vscsi->dev, "Unable to extract srpt_tpg_store_enable\n"); return -EINVAL; } if ((tmp != 0) && (tmp != 1)) { dev_err(&vscsi->dev, "Illegal value for srpt_tpg_store_enable\n"); return -EINVAL; } if (tmp) { spin_lock_bh(&vscsi->intr_lock); tport->enabled = true; lrc = ibmvscsis_enable_change_state(vscsi); if (lrc) dev_err(&vscsi->dev, "enable_change_state failed, rc %ld state %d\n", lrc, vscsi->state); spin_unlock_bh(&vscsi->intr_lock); } else { spin_lock_bh(&vscsi->intr_lock); tport->enabled = false; /* This simulates the server going down */ ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); spin_unlock_bh(&vscsi->intr_lock); } dev_dbg(&vscsi->dev, "tpg_enable_store, tmp %ld, state %d\n", tmp, vscsi->state); return count; } CONFIGFS_ATTR(ibmvscsis_tpg_, enable); static struct configfs_attribute *ibmvscsis_tpg_attrs[] = { &ibmvscsis_tpg_attr_enable, NULL, }; static const struct target_core_fabric_ops ibmvscsis_ops = { .module = THIS_MODULE, .fabric_name = "ibmvscsis", .max_data_sg_nents = MAX_TXU / PAGE_SIZE, .tpg_get_wwn = ibmvscsis_get_fabric_wwn, .tpg_get_tag = ibmvscsis_get_tag, .tpg_get_default_depth = ibmvscsis_get_default_depth, .tpg_check_demo_mode = ibmvscsis_check_true, .tpg_check_demo_mode_cache = ibmvscsis_check_true, .tpg_check_demo_mode_write_protect = ibmvscsis_check_false, .tpg_check_prod_mode_write_protect = ibmvscsis_check_false, .tpg_get_inst_index = ibmvscsis_tpg_get_inst_index, .check_stop_free = ibmvscsis_check_stop_free, .release_cmd = ibmvscsis_release_cmd, .sess_get_index = ibmvscsis_sess_get_index, .write_pending = ibmvscsis_write_pending, .set_default_node_attributes = ibmvscsis_set_default_node_attrs, .get_cmd_state = ibmvscsis_get_cmd_state, .queue_data_in = ibmvscsis_queue_data_in, .queue_status = ibmvscsis_queue_status, .queue_tm_rsp = ibmvscsis_queue_tm_rsp, .aborted_task = ibmvscsis_aborted_task, /* * Setup function pointers for logic in target_core_fabric_configfs.c */ .fabric_make_wwn = ibmvscsis_make_tport, .fabric_drop_wwn = ibmvscsis_drop_tport, .fabric_make_tpg = ibmvscsis_make_tpg, .fabric_drop_tpg = ibmvscsis_drop_tpg, .tfc_wwn_attrs = ibmvscsis_wwn_attrs, .tfc_tpg_base_attrs = ibmvscsis_tpg_attrs, }; static void ibmvscsis_dev_release(struct device *dev) {}; static struct device_attribute dev_attr_system_id = __ATTR(system_id, S_IRUGO, system_id_show, NULL); static struct device_attribute dev_attr_partition_number = __ATTR(partition_number, S_IRUGO, partition_number_show, NULL); static struct device_attribute dev_attr_unit_address = __ATTR(unit_address, S_IRUGO, unit_address_show, NULL); static struct attribute *ibmvscsis_dev_attrs[] = { &dev_attr_system_id.attr, &dev_attr_partition_number.attr, &dev_attr_unit_address.attr, }; ATTRIBUTE_GROUPS(ibmvscsis_dev); static struct class ibmvscsis_class = { .name = "ibmvscsis", .dev_release = ibmvscsis_dev_release, .dev_groups = ibmvscsis_dev_groups, }; static const struct vio_device_id ibmvscsis_device_table[] = { { "v-scsi-host", "IBM,v-scsi-host" }, { "", "" } }; MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table); static struct vio_driver ibmvscsis_driver = { .name = "ibmvscsis", .id_table = ibmvscsis_device_table, .probe = ibmvscsis_probe, .remove = ibmvscsis_remove, }; /* * ibmvscsis_init() - Kernel Module initialization * * Note: vio_register_driver() registers callback functions, and at least one * of those callback functions calls TCM - Linux IO Target Subsystem, thus * the SCSI Target template must be registered before vio_register_driver() * is called. */ static int __init ibmvscsis_init(void) { int rc = 0; rc = ibmvscsis_get_system_info(); if (rc) { pr_err("rc %d from get_system_info\n", rc); goto out; } rc = class_register(&ibmvscsis_class); if (rc) { pr_err("failed class register\n"); goto out; } rc = target_register_template(&ibmvscsis_ops); if (rc) { pr_err("rc %d from target_register_template\n", rc); goto unregister_class; } rc = vio_register_driver(&ibmvscsis_driver); if (rc) { pr_err("rc %d from vio_register_driver\n", rc); goto unregister_target; } return 0; unregister_target: target_unregister_template(&ibmvscsis_ops); unregister_class: class_unregister(&ibmvscsis_class); out: return rc; } static void __exit ibmvscsis_exit(void) { pr_info("Unregister IBM virtual SCSI host driver\n"); vio_unregister_driver(&ibmvscsis_driver); target_unregister_template(&ibmvscsis_ops); class_unregister(&ibmvscsis_class); } MODULE_DESCRIPTION("IBMVSCSIS fabric driver"); MODULE_AUTHOR("Bryant G. Ly and Michael Cyr"); MODULE_LICENSE("GPL"); MODULE_VERSION(IBMVSCSIS_VERSION); module_init(ibmvscsis_init); module_exit(ibmvscsis_exit);
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