1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * IBM Virtual SCSI Target Driver
4 * Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
5 * Santiago Leon (santil@us.ibm.com) IBM Corp.
6 * Linda Xie (lxie@us.ibm.com) IBM Corp.
8 * Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org>
9 * Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org>
11 * Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
12 * Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com>
14 ****************************************************************************/
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/types.h>
22 #include <linux/list.h>
23 #include <linux/string.h>
24 #include <linux/delay.h>
27 #include <target/target_core_base.h>
28 #include <target/target_core_fabric.h>
30 #include <asm/hvcall.h>
33 #include <scsi/viosrp.h>
35 #include "ibmvscsi_tgt.h"
37 #define IBMVSCSIS_VERSION "v0.2"
39 #define INITIAL_SRP_LIMIT 1024
40 #define DEFAULT_MAX_SECTORS 256
41 #define MAX_TXU 1024 * 1024
43 static uint max_vdma_size = MAX_H_COPY_RDMA;
45 static char system_id[SYS_ID_NAME_LEN] = "";
46 static char partition_name[PARTITION_NAMELEN] = "UNKNOWN";
47 static uint partition_number = -1;
49 /* Adapter list and lock to control it */
50 static DEFINE_SPINLOCK(ibmvscsis_dev_lock);
51 static LIST_HEAD(ibmvscsis_dev_list);
53 static long ibmvscsis_parse_command(struct scsi_info *vscsi,
54 struct viosrp_crq *crq);
56 static void ibmvscsis_adapter_idle(struct scsi_info *vscsi);
58 static void ibmvscsis_determine_resid(struct se_cmd *se_cmd,
61 u32 residual_count = se_cmd->residual_count;
66 if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
67 if (se_cmd->data_direction == DMA_TO_DEVICE) {
68 /* residual data from an underflow write */
69 rsp->flags = SRP_RSP_FLAG_DOUNDER;
70 rsp->data_out_res_cnt = cpu_to_be32(residual_count);
71 } else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
72 /* residual data from an underflow read */
73 rsp->flags = SRP_RSP_FLAG_DIUNDER;
74 rsp->data_in_res_cnt = cpu_to_be32(residual_count);
76 } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
77 if (se_cmd->data_direction == DMA_TO_DEVICE) {
78 /* residual data from an overflow write */
79 rsp->flags = SRP_RSP_FLAG_DOOVER;
80 rsp->data_out_res_cnt = cpu_to_be32(residual_count);
81 } else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
82 /* residual data from an overflow read */
83 rsp->flags = SRP_RSP_FLAG_DIOVER;
84 rsp->data_in_res_cnt = cpu_to_be32(residual_count);
90 * connection_broken() - Determine if the connection to the client is good
91 * @vscsi: Pointer to our adapter structure
93 * This function attempts to send a ping MAD to the client. If the call to
94 * queue the request returns H_CLOSED then the connection has been broken
95 * and the function returns TRUE.
97 * EXECUTION ENVIRONMENT:
98 * Interrupt or Process environment
100 static bool connection_broken(struct scsi_info *vscsi)
102 struct viosrp_crq *crq;
103 u64 buffer[2] = { 0, 0 };
107 /* create a PING crq */
108 crq = (struct viosrp_crq *)&buffer;
109 crq->valid = VALID_CMD_RESP_EL;
110 crq->format = MESSAGE_IN_CRQ;
113 h_return_code = h_send_crq(vscsi->dds.unit_id,
114 cpu_to_be64(buffer[MSG_HI]),
115 cpu_to_be64(buffer[MSG_LOW]));
117 dev_dbg(&vscsi->dev, "Connection_broken: rc %ld\n", h_return_code);
119 if (h_return_code == H_CLOSED)
126 * ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue
127 * @vscsi: Pointer to our adapter structure
129 * This function calls h_free_q then frees the interrupt bit etc.
130 * It must release the lock before doing so because of the time it can take
131 * for h_free_crq in PHYP
132 * NOTE: * the caller must make sure that state and or flags will prevent
133 * interrupt handler from scheduling work.
134 * * anyone calling this function may need to set the CRQ_CLOSED flag
135 * we can't do it here, because we don't have the lock
137 * EXECUTION ENVIRONMENT:
140 static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi)
143 long rc = ADAPT_SUCCESS;
147 qrc = h_free_crq(vscsi->dds.unit_id);
150 spin_lock_bh(&vscsi->intr_lock);
151 vscsi->flags &= ~PREP_FOR_SUSPEND_FLAGS;
152 spin_unlock_bh(&vscsi->intr_lock);
157 dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n",
163 case H_LONG_BUSY_ORDER_1_MSEC:
164 /* msleep not good for small values */
165 usleep_range(1000, 2000);
168 case H_LONG_BUSY_ORDER_10_MSEC:
169 usleep_range(10000, 20000);
172 case H_LONG_BUSY_ORDER_100_MSEC:
176 case H_LONG_BUSY_ORDER_1_SEC:
180 case H_LONG_BUSY_ORDER_10_SEC:
184 case H_LONG_BUSY_ORDER_100_SEC:
189 dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n",
196 * dont wait more then 300 seconds
197 * ticks are in milliseconds more or less
199 if (ticks > 300000 && qrc != H_SUCCESS) {
201 dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n");
203 } while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS);
205 dev_dbg(&vscsi->dev, "Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc);
211 * ibmvscsis_delete_client_info() - Helper function to Delete Client Info
212 * @vscsi: Pointer to our adapter structure
213 * @client_closed: True if client closed its queue
215 * Deletes information specific to the client when the client goes away
217 * EXECUTION ENVIRONMENT:
218 * Interrupt or Process
220 static void ibmvscsis_delete_client_info(struct scsi_info *vscsi,
223 vscsi->client_cap = 0;
226 * Some things we don't want to clear if we're closing the queue,
227 * because some clients don't resend the host handshake when they
228 * get a transport event.
231 vscsi->client_data.os_type = 0;
235 * ibmvscsis_free_command_q() - Free Command Queue
236 * @vscsi: Pointer to our adapter structure
238 * This function calls unregister_command_q, then clears interrupts and
239 * any pending interrupt acknowledgments associated with the command q.
240 * It also clears memory if there is no error.
242 * PHYP did not meet the PAPR architecture so that we must give up the
243 * lock. This causes a timing hole regarding state change. To close the
244 * hole this routine does accounting on any change that occurred during
245 * the time the lock is not held.
246 * NOTE: must give up and then acquire the interrupt lock, the caller must
247 * make sure that state and or flags will prevent interrupt handler from
250 * EXECUTION ENVIRONMENT:
251 * Process level, interrupt lock is held
253 static long ibmvscsis_free_command_q(struct scsi_info *vscsi)
256 u32 flags_under_lock;
257 u16 state_under_lock;
258 long rc = ADAPT_SUCCESS;
260 if (!(vscsi->flags & CRQ_CLOSED)) {
261 vio_disable_interrupts(vscsi->dma_dev);
263 state_under_lock = vscsi->new_state;
264 flags_under_lock = vscsi->flags;
265 vscsi->phyp_acr_state = 0;
266 vscsi->phyp_acr_flags = 0;
268 spin_unlock_bh(&vscsi->intr_lock);
269 rc = ibmvscsis_unregister_command_q(vscsi);
270 spin_lock_bh(&vscsi->intr_lock);
272 if (state_under_lock != vscsi->new_state)
273 vscsi->phyp_acr_state = vscsi->new_state;
275 vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags);
277 if (rc == ADAPT_SUCCESS) {
278 bytes = vscsi->cmd_q.size * PAGE_SIZE;
279 memset(vscsi->cmd_q.base_addr, 0, bytes);
280 vscsi->cmd_q.index = 0;
281 vscsi->flags |= CRQ_CLOSED;
283 ibmvscsis_delete_client_info(vscsi, false);
286 dev_dbg(&vscsi->dev, "free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
287 vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
288 vscsi->phyp_acr_state);
294 * ibmvscsis_cmd_q_dequeue() - Get valid Command element
295 * @mask: Mask to use in case index wraps
296 * @current_index: Current index into command queue
297 * @base_addr: Pointer to start of command queue
299 * Returns a pointer to a valid command element or NULL, if the command
302 * EXECUTION ENVIRONMENT:
303 * Interrupt environment, interrupt lock held
305 static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask,
307 struct viosrp_crq *base_addr)
309 struct viosrp_crq *ptr;
311 ptr = base_addr + *current_index;
314 *current_index = (*current_index + 1) & mask;
324 * ibmvscsis_send_init_message() - send initialize message to the client
325 * @vscsi: Pointer to our adapter structure
326 * @format: Which Init Message format to send
328 * EXECUTION ENVIRONMENT:
329 * Interrupt environment interrupt lock held
331 static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format)
333 struct viosrp_crq *crq;
334 u64 buffer[2] = { 0, 0 };
337 crq = (struct viosrp_crq *)&buffer;
338 crq->valid = VALID_INIT_MSG;
339 crq->format = format;
340 rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
341 cpu_to_be64(buffer[MSG_LOW]));
347 * ibmvscsis_check_init_msg() - Check init message valid
348 * @vscsi: Pointer to our adapter structure
349 * @format: Pointer to return format of Init Message, if any.
350 * Set to UNUSED_FORMAT if no Init Message in queue.
352 * Checks if an initialize message was queued by the initiatior
353 * after the queue was created and before the interrupt was enabled.
355 * EXECUTION ENVIRONMENT:
356 * Process level only, interrupt lock held
358 static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format)
360 struct viosrp_crq *crq;
361 long rc = ADAPT_SUCCESS;
363 crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index,
364 vscsi->cmd_q.base_addr);
366 *format = (uint)UNUSED_FORMAT;
367 } else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) {
368 *format = (uint)INIT_MSG;
369 crq->valid = INVALIDATE_CMD_RESP_EL;
373 * the caller has ensured no initialize message was
374 * sent after the queue was
375 * created so there should be no other message on the queue.
377 crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask,
379 vscsi->cmd_q.base_addr);
381 *format = (uint)(crq->format);
383 crq->valid = INVALIDATE_CMD_RESP_EL;
387 *format = (uint)(crq->format);
389 crq->valid = INVALIDATE_CMD_RESP_EL;
397 * ibmvscsis_disconnect() - Helper function to disconnect
398 * @work: Pointer to work_struct, gives access to our adapter structure
400 * An error has occurred or the driver received a Transport event,
401 * and the driver is requesting that the command queue be de-registered
402 * in a safe manner. If there is no outstanding I/O then we can stop the
403 * queue. If we are restarting the queue it will be reflected in the
404 * the state of the adapter.
406 * EXECUTION ENVIRONMENT:
407 * Process environment
409 static void ibmvscsis_disconnect(struct work_struct *work)
411 struct scsi_info *vscsi = container_of(work, struct scsi_info,
414 bool wait_idle = false;
416 spin_lock_bh(&vscsi->intr_lock);
417 new_state = vscsi->new_state;
418 vscsi->new_state = 0;
420 vscsi->flags |= DISCONNECT_SCHEDULED;
421 vscsi->flags &= ~SCHEDULE_DISCONNECT;
423 dev_dbg(&vscsi->dev, "disconnect: flags 0x%x, state 0x%hx\n",
424 vscsi->flags, vscsi->state);
427 * check which state we are in and see if we
428 * should transitition to the new state
430 switch (vscsi->state) {
431 /* Should never be called while in this state. */
434 * Can never transition from this state;
435 * igonore errors and logout.
440 /* can transition from this state to UNCONFIGURING */
442 if (new_state == UNCONFIGURING)
443 vscsi->state = new_state;
447 * Can transition from this state to to unconfiguring
450 case ERR_DISCONNECT_RECONNECT:
454 vscsi->state = new_state;
464 /* can transition from this state to UNCONFIGURING */
465 case ERR_DISCONNECTED:
466 if (new_state == UNCONFIGURING)
467 vscsi->state = new_state;
473 vscsi->state = new_state;
474 vscsi->flags |= RESPONSE_Q_DOWN;
475 vscsi->flags &= ~(SCHEDULE_DISCONNECT |
476 DISCONNECT_SCHEDULED);
478 if (vscsi->flags & CFG_SLEEPING) {
479 vscsi->flags &= ~CFG_SLEEPING;
480 complete(&vscsi->unconfig);
484 /* should never happen */
486 case ERR_DISCONNECT_RECONNECT:
488 dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n",
497 vscsi->flags |= RESPONSE_Q_DOWN;
498 vscsi->state = new_state;
499 vscsi->flags &= ~(SCHEDULE_DISCONNECT |
500 DISCONNECT_SCHEDULED);
501 ibmvscsis_free_command_q(vscsi);
504 case ERR_DISCONNECT_RECONNECT:
505 vscsi->state = new_state;
511 * Initiator has not done a successful srp login
512 * or has done a successful srp logout ( adapter was not
513 * busy). In the first case there can be responses queued
514 * waiting for space on the initiators response queue (MAD)
515 * The second case the adapter is idle. Assume the worse case,
516 * i.e. the second case.
518 case WAIT_CONNECTION:
522 vscsi->state = new_state;
525 /* can transition from this state to UNCONFIGURING */
527 if (new_state == UNCONFIGURING)
528 vscsi->state = new_state;
535 dev_dbg(&vscsi->dev, "disconnect start wait, active %d, sched %d\n",
536 (int)list_empty(&vscsi->active_q),
537 (int)list_empty(&vscsi->schedule_q));
538 if (!list_empty(&vscsi->active_q) ||
539 !list_empty(&vscsi->schedule_q)) {
540 vscsi->flags |= WAIT_FOR_IDLE;
541 dev_dbg(&vscsi->dev, "disconnect flags 0x%x\n",
544 * This routine is can not be called with the interrupt
547 spin_unlock_bh(&vscsi->intr_lock);
548 wait_for_completion(&vscsi->wait_idle);
549 spin_lock_bh(&vscsi->intr_lock);
551 dev_dbg(&vscsi->dev, "disconnect stop wait\n");
553 ibmvscsis_adapter_idle(vscsi);
556 spin_unlock_bh(&vscsi->intr_lock);
560 * ibmvscsis_post_disconnect() - Schedule the disconnect
561 * @vscsi: Pointer to our adapter structure
562 * @new_state: State to move to after disconnecting
563 * @flag_bits: Flags to turn on in adapter structure
565 * If it's already been scheduled, then see if we need to "upgrade"
566 * the new state (if the one passed in is more "severe" than the
570 * interrupt lock is held
572 static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state,
577 /* check the validity of the new state */
581 case ERR_DISCONNECT_RECONNECT:
586 dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n",
591 vscsi->flags |= flag_bits;
593 dev_dbg(&vscsi->dev, "post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n",
594 new_state, flag_bits, vscsi->flags, vscsi->state);
596 if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) {
597 vscsi->flags |= SCHEDULE_DISCONNECT;
598 vscsi->new_state = new_state;
600 INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect);
601 (void)queue_work(vscsi->work_q, &vscsi->proc_work);
603 if (vscsi->new_state)
604 state = vscsi->new_state;
606 state = vscsi->state;
613 case ERR_DISCONNECTED:
616 if (new_state == UNCONFIGURING)
617 vscsi->new_state = new_state;
620 case ERR_DISCONNECT_RECONNECT:
624 vscsi->new_state = new_state;
633 case WAIT_CONNECTION:
636 vscsi->new_state = new_state;
644 dev_dbg(&vscsi->dev, "Leaving post_disconnect: flags 0x%x, new_state 0x%x\n",
645 vscsi->flags, vscsi->new_state);
649 * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message
650 * @vscsi: Pointer to our adapter structure
652 * Must be called with interrupt lock held.
654 static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi)
656 long rc = ADAPT_SUCCESS;
658 switch (vscsi->state) {
661 case ERR_DISCONNECT_RECONNECT:
662 case ERR_DISCONNECTED:
668 case WAIT_CONNECTION:
669 vscsi->state = CONNECTED;
678 dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n",
680 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
688 * ibmvscsis_handle_init_msg() - Respond to an Init Message
689 * @vscsi: Pointer to our adapter structure
691 * Must be called with interrupt lock held.
693 static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi)
695 long rc = ADAPT_SUCCESS;
697 switch (vscsi->state) {
698 case WAIT_CONNECTION:
699 rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG);
702 vscsi->state = CONNECTED;
706 dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
708 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
712 dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
715 ibmvscsis_post_disconnect(vscsi,
716 ERR_DISCONNECT_RECONNECT, 0);
720 dev_warn(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
740 case ERR_DISCONNECT_RECONNECT:
741 case ERR_DISCONNECTED:
744 dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n",
746 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
754 * ibmvscsis_init_msg() - Respond to an init message
755 * @vscsi: Pointer to our adapter structure
756 * @crq: Pointer to CRQ element containing the Init Message
758 * EXECUTION ENVIRONMENT:
759 * Interrupt, interrupt lock held
761 static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq)
763 long rc = ADAPT_SUCCESS;
765 dev_dbg(&vscsi->dev, "init_msg: state 0x%hx\n", vscsi->state);
767 rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
768 (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
770 if (rc == H_SUCCESS) {
771 vscsi->client_data.partition_number =
772 be64_to_cpu(*(u64 *)vscsi->map_buf);
773 dev_dbg(&vscsi->dev, "init_msg, part num %d\n",
774 vscsi->client_data.partition_number);
776 dev_dbg(&vscsi->dev, "init_msg h_vioctl rc %ld\n", rc);
780 if (crq->format == INIT_MSG) {
781 rc = ibmvscsis_handle_init_msg(vscsi);
782 } else if (crq->format == INIT_COMPLETE_MSG) {
783 rc = ibmvscsis_handle_init_compl_msg(vscsi);
786 dev_err(&vscsi->dev, "init_msg: invalid format %d\n",
788 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
795 * ibmvscsis_establish_new_q() - Establish new CRQ queue
796 * @vscsi: Pointer to our adapter structure
798 * Must be called with interrupt lock held.
800 static long ibmvscsis_establish_new_q(struct scsi_info *vscsi)
802 long rc = ADAPT_SUCCESS;
805 rc = h_vioctl(vscsi->dds.unit_id, H_ENABLE_PREPARE_FOR_SUSPEND, 30000,
808 vscsi->flags |= PREP_FOR_SUSPEND_ENABLED;
809 else if (rc != H_NOT_FOUND)
810 dev_err(&vscsi->dev, "Error from Enable Prepare for Suspend: %ld\n",
813 vscsi->flags &= PRESERVE_FLAG_FIELDS;
814 vscsi->rsp_q_timer.timer_pops = 0;
818 rc = vio_enable_interrupts(vscsi->dma_dev);
820 dev_warn(&vscsi->dev, "establish_new_q: failed to enable interrupts, rc %ld\n",
825 rc = ibmvscsis_check_init_msg(vscsi, &format);
827 dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n",
832 if (format == UNUSED_FORMAT) {
833 rc = ibmvscsis_send_init_message(vscsi, INIT_MSG);
846 vscsi->state = UNDEFINED;
850 } else if (format == INIT_MSG) {
851 rc = ibmvscsis_handle_init_msg(vscsi);
858 * ibmvscsis_reset_queue() - Reset CRQ Queue
859 * @vscsi: Pointer to our adapter structure
861 * This function calls h_free_q and then calls h_reg_q and does all
862 * of the bookkeeping to get us back to where we can communicate.
864 * Actually, we don't always call h_free_crq. A problem was discovered
865 * where one partition would close and reopen his queue, which would
866 * cause his partner to get a transport event, which would cause him to
867 * close and reopen his queue, which would cause the original partition
868 * to get a transport event, etc., etc. To prevent this, we don't
869 * actually close our queue if the client initiated the reset, (i.e.
870 * either we got a transport event or we have detected that the client's
873 * EXECUTION ENVIRONMENT:
874 * Process environment, called with interrupt lock held
876 static void ibmvscsis_reset_queue(struct scsi_info *vscsi)
879 long rc = ADAPT_SUCCESS;
881 dev_dbg(&vscsi->dev, "reset_queue: flags 0x%x\n", vscsi->flags);
883 /* don't reset, the client did it for us */
884 if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) {
885 vscsi->flags &= PRESERVE_FLAG_FIELDS;
886 vscsi->rsp_q_timer.timer_pops = 0;
889 vscsi->state = WAIT_CONNECTION;
890 vio_enable_interrupts(vscsi->dma_dev);
892 rc = ibmvscsis_free_command_q(vscsi);
893 if (rc == ADAPT_SUCCESS) {
894 vscsi->state = WAIT_CONNECTION;
896 bytes = vscsi->cmd_q.size * PAGE_SIZE;
897 rc = h_reg_crq(vscsi->dds.unit_id,
898 vscsi->cmd_q.crq_token, bytes);
899 if (rc == H_CLOSED || rc == H_SUCCESS) {
900 rc = ibmvscsis_establish_new_q(vscsi);
903 if (rc != ADAPT_SUCCESS) {
904 dev_dbg(&vscsi->dev, "reset_queue: reg_crq rc %ld\n",
907 vscsi->state = ERR_DISCONNECTED;
908 vscsi->flags |= RESPONSE_Q_DOWN;
909 ibmvscsis_free_command_q(vscsi);
912 vscsi->state = ERR_DISCONNECTED;
913 vscsi->flags |= RESPONSE_Q_DOWN;
919 * ibmvscsis_free_cmd_resources() - Free command resources
920 * @vscsi: Pointer to our adapter structure
921 * @cmd: Command which is not longer in use
923 * Must be called with interrupt lock held.
925 static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi,
926 struct ibmvscsis_cmd *cmd)
928 struct iu_entry *iue = cmd->iue;
931 case TASK_MANAGEMENT:
934 * When the queue goes down this value is cleared, so it
935 * cannot be cleared in this general purpose function.
941 vscsi->flags &= ~PROCESSING_MAD;
946 dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n",
952 list_add_tail(&cmd->list, &vscsi->free_cmd);
955 if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) &&
956 list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) {
957 vscsi->flags &= ~WAIT_FOR_IDLE;
958 complete(&vscsi->wait_idle);
963 * ibmvscsis_ready_for_suspend() - Helper function to call VIOCTL
964 * @vscsi: Pointer to our adapter structure
965 * @idle: Indicates whether we were called from adapter_idle. This
966 * is important to know if we need to do a disconnect, since if
967 * we're called from adapter_idle, we're still processing the
968 * current disconnect, so we can't just call post_disconnect.
970 * This function is called when the adapter is idle when phyp has sent
971 * us a Prepare for Suspend Transport Event.
973 * EXECUTION ENVIRONMENT:
974 * Process or interrupt environment called with interrupt lock held
976 static long ibmvscsis_ready_for_suspend(struct scsi_info *vscsi, bool idle)
979 struct viosrp_crq *crq;
981 /* See if there is a Resume event in the queue */
982 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
984 dev_dbg(&vscsi->dev, "ready_suspend: flags 0x%x, state 0x%hx crq_valid:%x\n",
985 vscsi->flags, vscsi->state, (int)crq->valid);
987 if (!(vscsi->flags & PREP_FOR_SUSPEND_ABORTED) && !(crq->valid)) {
988 rc = h_vioctl(vscsi->dds.unit_id, H_READY_FOR_SUSPEND, 0, 0, 0,
991 dev_err(&vscsi->dev, "Ready for Suspend Vioctl failed: %ld\n",
995 } else if (((vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE) &&
996 (vscsi->flags & PREP_FOR_SUSPEND_ABORTED)) ||
997 ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
998 (crq->format != RESUME_FROM_SUSP)))) {
1000 vscsi->state = ERR_DISCONNECT_RECONNECT;
1001 ibmvscsis_reset_queue(vscsi);
1003 } else if (vscsi->state == CONNECTED) {
1004 ibmvscsis_post_disconnect(vscsi,
1005 ERR_DISCONNECT_RECONNECT, 0);
1008 vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1010 if ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
1011 (crq->format != RESUME_FROM_SUSP)))
1012 dev_err(&vscsi->dev, "Invalid element in CRQ after Prepare for Suspend");
1015 vscsi->flags &= ~(PREP_FOR_SUSPEND_PENDING | PREP_FOR_SUSPEND_ABORTED);
1021 * ibmvscsis_trans_event() - Handle a Transport Event
1022 * @vscsi: Pointer to our adapter structure
1023 * @crq: Pointer to CRQ entry containing the Transport Event
1025 * Do the logic to close the I_T nexus. This function may not
1026 * behave to specification.
1028 * EXECUTION ENVIRONMENT:
1029 * Interrupt, interrupt lock held
1031 static long ibmvscsis_trans_event(struct scsi_info *vscsi,
1032 struct viosrp_crq *crq)
1034 long rc = ADAPT_SUCCESS;
1036 dev_dbg(&vscsi->dev, "trans_event: format %d, flags 0x%x, state 0x%hx\n",
1037 (int)crq->format, vscsi->flags, vscsi->state);
1039 switch (crq->format) {
1041 case PARTNER_FAILED:
1042 case PARTNER_DEREGISTER:
1043 ibmvscsis_delete_client_info(vscsi, true);
1044 if (crq->format == MIGRATED)
1045 vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1046 switch (vscsi->state) {
1048 case ERR_DISCONNECTED:
1053 vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
1059 case WAIT_CONNECTION:
1063 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
1068 case SRP_PROCESSING:
1069 if ((vscsi->debit > 0) ||
1070 !list_empty(&vscsi->schedule_q) ||
1071 !list_empty(&vscsi->waiting_rsp) ||
1072 !list_empty(&vscsi->active_q)) {
1073 dev_dbg(&vscsi->dev, "debit %d, sched %d, wait %d, active %d\n",
1075 (int)list_empty(&vscsi->schedule_q),
1076 (int)list_empty(&vscsi->waiting_rsp),
1077 (int)list_empty(&vscsi->active_q));
1078 dev_warn(&vscsi->dev, "connection lost with outstanding work\n");
1080 dev_dbg(&vscsi->dev, "trans_event: SRP Processing, but no outstanding work\n");
1083 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
1088 case ERR_DISCONNECT:
1089 case ERR_DISCONNECT_RECONNECT:
1091 vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
1096 case PREPARE_FOR_SUSPEND:
1097 dev_dbg(&vscsi->dev, "Prep for Suspend, crq status = 0x%x\n",
1099 switch (vscsi->state) {
1100 case ERR_DISCONNECTED:
1101 case WAIT_CONNECTION:
1103 ibmvscsis_ready_for_suspend(vscsi, false);
1105 case SRP_PROCESSING:
1106 vscsi->resume_state = vscsi->state;
1107 vscsi->flags |= PREP_FOR_SUSPEND_PENDING;
1108 if (crq->status == CRQ_ENTRY_OVERWRITTEN)
1109 vscsi->flags |= PREP_FOR_SUSPEND_OVERWRITE;
1110 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
1116 case ERR_DISCONNECT:
1117 case ERR_DISCONNECT_RECONNECT:
1119 dev_err(&vscsi->dev, "Invalid state for Prepare for Suspend Trans Event: 0x%x\n",
1125 case RESUME_FROM_SUSP:
1126 dev_dbg(&vscsi->dev, "Resume from Suspend, crq status = 0x%x\n",
1128 if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
1129 vscsi->flags |= PREP_FOR_SUSPEND_ABORTED;
1131 if ((crq->status == CRQ_ENTRY_OVERWRITTEN) ||
1132 (vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE)) {
1133 ibmvscsis_post_disconnect(vscsi,
1134 ERR_DISCONNECT_RECONNECT,
1136 vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1143 dev_err(&vscsi->dev, "trans_event: invalid format %d\n",
1145 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT,
1150 rc = vscsi->flags & SCHEDULE_DISCONNECT;
1152 dev_dbg(&vscsi->dev, "Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n",
1153 vscsi->flags, vscsi->state, rc);
1159 * ibmvscsis_poll_cmd_q() - Poll Command Queue
1160 * @vscsi: Pointer to our adapter structure
1162 * Called to handle command elements that may have arrived while
1163 * interrupts were disabled.
1165 * EXECUTION ENVIRONMENT:
1166 * intr_lock must be held
1168 static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi)
1170 struct viosrp_crq *crq;
1175 dev_dbg(&vscsi->dev, "poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n",
1176 vscsi->flags, vscsi->state, vscsi->cmd_q.index);
1178 rc = vscsi->flags & SCHEDULE_DISCONNECT;
1179 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
1185 vscsi->cmd_q.index =
1186 (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;
1189 rc = ibmvscsis_parse_command(vscsi, crq);
1191 if ((uint)crq->valid == VALID_TRANS_EVENT) {
1193 * must service the transport layer events even
1194 * in an error state, dont break out until all
1195 * the consecutive transport events have been
1198 rc = ibmvscsis_trans_event(vscsi, crq);
1199 } else if (vscsi->flags & TRANS_EVENT) {
1201 * if a tranport event has occurred leave
1202 * everything but transport events on the queue
1204 dev_dbg(&vscsi->dev, "poll_cmd_q, ignoring\n");
1207 * need to decrement the queue index so we can
1208 * look at the elment again
1210 if (vscsi->cmd_q.index)
1211 vscsi->cmd_q.index -= 1;
1214 * index is at 0 it just wrapped.
1215 * have it index last element in q
1217 vscsi->cmd_q.index = vscsi->cmd_q.mask;
1222 crq->valid = INVALIDATE_CMD_RESP_EL;
1224 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
1231 vio_enable_interrupts(vscsi->dma_dev);
1233 dev_dbg(&vscsi->dev, "poll_cmd_q, reenabling interrupts\n");
1241 dev_dbg(&vscsi->dev, "Leaving poll_cmd_q: rc %ld\n", rc);
1245 * ibmvscsis_free_cmd_qs() - Free elements in queue
1246 * @vscsi: Pointer to our adapter structure
1248 * Free all of the elements on all queues that are waiting for
1252 * Called with interrupt lock held
1254 static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi)
1256 struct ibmvscsis_cmd *cmd, *nxt;
1258 dev_dbg(&vscsi->dev, "free_cmd_qs: waiting_rsp empty %d, timer starter %d\n",
1259 (int)list_empty(&vscsi->waiting_rsp),
1260 vscsi->rsp_q_timer.started);
1262 list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) {
1263 list_del(&cmd->list);
1264 ibmvscsis_free_cmd_resources(vscsi, cmd);
1269 * ibmvscsis_get_free_cmd() - Get free command from list
1270 * @vscsi: Pointer to our adapter structure
1272 * Must be called with interrupt lock held.
1274 static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi)
1276 struct ibmvscsis_cmd *cmd = NULL;
1277 struct iu_entry *iue;
1279 iue = srp_iu_get(&vscsi->target);
1281 cmd = list_first_entry_or_null(&vscsi->free_cmd,
1282 struct ibmvscsis_cmd, list);
1285 cmd->abort_cmd = NULL;
1286 cmd->flags &= ~(DELAY_SEND);
1287 list_del(&cmd->list);
1289 cmd->type = UNSET_TYPE;
1290 memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd));
1300 * ibmvscsis_adapter_idle() - Helper function to handle idle adapter
1301 * @vscsi: Pointer to our adapter structure
1303 * This function is called when the adapter is idle when the driver
1304 * is attempting to clear an error condition.
1305 * The adapter is considered busy if any of its cmd queues
1306 * are non-empty. This function can be invoked
1307 * from the off level disconnect function.
1309 * EXECUTION ENVIRONMENT:
1310 * Process environment called with interrupt lock held
1312 static void ibmvscsis_adapter_idle(struct scsi_info *vscsi)
1314 int free_qs = false;
1317 dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx\n",
1318 vscsi->flags, vscsi->state);
1320 /* Only need to free qs if we're disconnecting from client */
1321 if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT)
1324 switch (vscsi->state) {
1326 ibmvscsis_free_command_q(vscsi);
1329 if (vscsi->flags & CFG_SLEEPING) {
1330 vscsi->flags &= ~CFG_SLEEPING;
1331 complete(&vscsi->unconfig);
1334 case ERR_DISCONNECT_RECONNECT:
1335 ibmvscsis_reset_queue(vscsi);
1336 dev_dbg(&vscsi->dev, "adapter_idle, disc_rec: flags 0x%x\n",
1340 case ERR_DISCONNECT:
1341 ibmvscsis_free_command_q(vscsi);
1342 vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED);
1343 vscsi->flags |= RESPONSE_Q_DOWN;
1344 if (vscsi->tport.enabled)
1345 vscsi->state = ERR_DISCONNECTED;
1347 vscsi->state = WAIT_ENABLED;
1348 dev_dbg(&vscsi->dev, "adapter_idle, disc: flags 0x%x, state 0x%hx\n",
1349 vscsi->flags, vscsi->state);
1353 vscsi->rsp_q_timer.timer_pops = 0;
1356 if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
1357 vscsi->state = vscsi->resume_state;
1358 vscsi->resume_state = 0;
1359 rc = ibmvscsis_ready_for_suspend(vscsi, true);
1360 vscsi->flags &= ~DISCONNECT_SCHEDULED;
1363 } else if (vscsi->flags & TRANS_EVENT) {
1364 vscsi->state = WAIT_CONNECTION;
1365 vscsi->flags &= PRESERVE_FLAG_FIELDS;
1367 vscsi->state = CONNECTED;
1368 vscsi->flags &= ~DISCONNECT_SCHEDULED;
1371 dev_dbg(&vscsi->dev, "adapter_idle, wait: flags 0x%x, state 0x%hx\n",
1372 vscsi->flags, vscsi->state);
1373 ibmvscsis_poll_cmd_q(vscsi);
1376 case ERR_DISCONNECTED:
1377 vscsi->flags &= ~DISCONNECT_SCHEDULED;
1378 dev_dbg(&vscsi->dev, "adapter_idle, disconnected: flags 0x%x, state 0x%hx\n",
1379 vscsi->flags, vscsi->state);
1383 dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n",
1389 ibmvscsis_free_cmd_qs(vscsi);
1392 * There is a timing window where we could lose a disconnect request.
1393 * The known path to this window occurs during the DISCONNECT_RECONNECT
1394 * case above: reset_queue calls free_command_q, which will release the
1395 * interrupt lock. During that time, a new post_disconnect call can be
1396 * made with a "more severe" state (DISCONNECT or UNCONFIGURING).
1397 * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect
1398 * will only set the new_state. Now free_command_q reacquires the intr
1399 * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_
1400 * FIELDS), and the disconnect is lost. This is particularly bad when
1401 * the new disconnect was for UNCONFIGURING, since the unconfigure hangs
1403 * Fix is that free command queue sets acr state and acr flags if there
1404 * is a change under the lock
1405 * note free command queue writes to this state it clears it
1406 * before releasing the lock, different drivers call the free command
1407 * queue different times so dont initialize above
1409 if (vscsi->phyp_acr_state != 0) {
1411 * set any bits in flags that may have been cleared by
1412 * a call to free command queue in switch statement
1415 vscsi->flags |= vscsi->phyp_acr_flags;
1416 ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0);
1417 vscsi->phyp_acr_state = 0;
1418 vscsi->phyp_acr_flags = 0;
1420 dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
1421 vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
1422 vscsi->phyp_acr_state);
1425 dev_dbg(&vscsi->dev, "Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n",
1426 vscsi->flags, vscsi->state, vscsi->new_state);
1430 * ibmvscsis_copy_crq_packet() - Copy CRQ Packet
1431 * @vscsi: Pointer to our adapter structure
1432 * @cmd: Pointer to command element to use to process the request
1433 * @crq: Pointer to CRQ entry containing the request
1435 * Copy the srp information unit from the hosted
1436 * partition using remote dma
1438 * EXECUTION ENVIRONMENT:
1439 * Interrupt, interrupt lock held
1441 static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi,
1442 struct ibmvscsis_cmd *cmd,
1443 struct viosrp_crq *crq)
1445 struct iu_entry *iue = cmd->iue;
1449 len = be16_to_cpu(crq->IU_length);
1450 if ((len > SRP_MAX_IU_LEN) || (len == 0)) {
1451 dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len);
1452 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
1453 return SRP_VIOLATION;
1456 rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn,
1457 be64_to_cpu(crq->IU_data_ptr),
1458 vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma);
1462 cmd->init_time = mftb();
1463 iue->remote_token = crq->IU_data_ptr;
1465 dev_dbg(&vscsi->dev, "copy_crq: ioba 0x%llx, init_time 0x%llx\n",
1466 be64_to_cpu(crq->IU_data_ptr), cmd->init_time);
1469 if (connection_broken(vscsi))
1470 ibmvscsis_post_disconnect(vscsi,
1471 ERR_DISCONNECT_RECONNECT,
1475 ibmvscsis_post_disconnect(vscsi,
1476 ERR_DISCONNECT_RECONNECT, 0);
1478 dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
1484 dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
1486 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
1494 * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram
1495 * @vscsi: Pointer to our adapter structure
1496 * @iue: Information Unit containing the Adapter Info MAD request
1498 * EXECUTION ENVIRONMENT:
1499 * Interrupt adapter lock is held
1501 static long ibmvscsis_adapter_info(struct scsi_info *vscsi,
1502 struct iu_entry *iue)
1504 struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info;
1505 struct mad_adapter_info_data *info;
1510 mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1512 if (be16_to_cpu(mad->common.length) > sizeof(*info)) {
1513 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1517 info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token,
1520 dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
1522 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1526 /* Get remote info */
1527 rc = h_copy_rdma(be16_to_cpu(mad->common.length),
1528 vscsi->dds.window[REMOTE].liobn,
1529 be64_to_cpu(mad->buffer),
1530 vscsi->dds.window[LOCAL].liobn, token);
1532 if (rc != H_SUCCESS) {
1533 if (rc == H_PERMISSION) {
1534 if (connection_broken(vscsi))
1535 flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
1537 dev_warn(&vscsi->dev, "adapter_info: h_copy_rdma from client failed, rc %ld\n",
1539 dev_dbg(&vscsi->dev, "adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n",
1540 be64_to_cpu(mad->buffer), vscsi->flags, flag_bits);
1541 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
1547 * Copy client info, but ignore partition number, which we
1548 * already got from phyp - unless we failed to get it from
1549 * phyp (e.g. if we're running on a p5 system).
1551 if (vscsi->client_data.partition_number == 0)
1552 vscsi->client_data.partition_number =
1553 be32_to_cpu(info->partition_number);
1554 strncpy(vscsi->client_data.srp_version, info->srp_version,
1555 sizeof(vscsi->client_data.srp_version));
1556 strncpy(vscsi->client_data.partition_name, info->partition_name,
1557 sizeof(vscsi->client_data.partition_name));
1558 vscsi->client_data.mad_version = be32_to_cpu(info->mad_version);
1559 vscsi->client_data.os_type = be32_to_cpu(info->os_type);
1562 strncpy(info->srp_version, SRP_VERSION,
1563 sizeof(info->srp_version));
1564 strncpy(info->partition_name, vscsi->dds.partition_name,
1565 sizeof(info->partition_name));
1566 info->partition_number = cpu_to_be32(vscsi->dds.partition_num);
1567 info->mad_version = cpu_to_be32(MAD_VERSION_1);
1568 info->os_type = cpu_to_be32(LINUX);
1569 memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu));
1570 info->port_max_txu[0] = cpu_to_be32(MAX_TXU);
1573 rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn,
1574 token, vscsi->dds.window[REMOTE].liobn,
1575 be64_to_cpu(mad->buffer));
1583 if (connection_broken(vscsi))
1584 flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
1587 dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n",
1589 ibmvscsis_post_disconnect(vscsi,
1590 ERR_DISCONNECT_RECONNECT,
1596 dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token);
1597 dev_dbg(&vscsi->dev, "Leaving adapter_info, rc %ld\n", rc);
1603 * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram
1604 * @vscsi: Pointer to our adapter structure
1605 * @iue: Information Unit containing the Capabilities MAD request
1607 * NOTE: if you return an error from this routine you must be
1608 * disconnecting or you will cause a hang
1610 * EXECUTION ENVIRONMENT:
1611 * Interrupt called with adapter lock held
1613 static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue)
1615 struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities;
1616 struct capabilities *cap;
1617 struct mad_capability_common *common;
1619 u16 olen, len, status, min_len, cap_len;
1624 olen = be16_to_cpu(mad->common.length);
1626 * struct capabilities hardcodes a couple capabilities after the
1627 * header, but the capabilities can actually be in any order.
1629 min_len = offsetof(struct capabilities, migration);
1630 if ((olen < min_len) || (olen > PAGE_SIZE)) {
1631 dev_warn(&vscsi->dev, "cap_mad: invalid len %d\n", olen);
1632 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1636 cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token,
1639 dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
1641 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1644 rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn,
1645 be64_to_cpu(mad->buffer),
1646 vscsi->dds.window[LOCAL].liobn, token);
1647 if (rc == H_SUCCESS) {
1648 strncpy(cap->name, dev_name(&vscsi->dma_dev->dev),
1651 len = olen - min_len;
1652 status = VIOSRP_MAD_SUCCESS;
1653 common = (struct mad_capability_common *)&cap->migration;
1655 while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) {
1656 dev_dbg(&vscsi->dev, "cap_mad: len left %hd, cap type %d, cap len %hd\n",
1657 len, be32_to_cpu(common->cap_type),
1658 be16_to_cpu(common->length));
1660 cap_len = be16_to_cpu(common->length);
1661 if (cap_len > len) {
1662 dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n");
1663 status = VIOSRP_MAD_FAILED;
1668 dev_err(&vscsi->dev, "cap_mad: cap len is 0\n");
1669 status = VIOSRP_MAD_FAILED;
1673 switch (common->cap_type) {
1675 dev_dbg(&vscsi->dev, "cap_mad: unsupported capability\n");
1676 common->server_support = 0;
1677 flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED);
1678 cap->flags &= ~flag;
1682 len = len - cap_len;
1683 common = (struct mad_capability_common *)
1684 ((char *)common + cap_len);
1687 mad->common.status = cpu_to_be16(status);
1690 rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token,
1691 vscsi->dds.window[REMOTE].liobn,
1692 be64_to_cpu(mad->buffer));
1694 if (rc != H_SUCCESS) {
1695 dev_dbg(&vscsi->dev, "cap_mad: failed to copy to client, rc %ld\n",
1698 if (rc == H_PERMISSION) {
1699 if (connection_broken(vscsi))
1700 flag_bits = (RESPONSE_Q_DOWN |
1704 dev_warn(&vscsi->dev, "cap_mad: error copying data to client, rc %ld\n",
1706 ibmvscsis_post_disconnect(vscsi,
1707 ERR_DISCONNECT_RECONNECT,
1712 dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token);
1714 dev_dbg(&vscsi->dev, "Leaving cap_mad, rc %ld, client_cap 0x%x\n",
1715 rc, vscsi->client_cap);
1721 * ibmvscsis_process_mad() - Service a MAnagement Data gram
1722 * @vscsi: Pointer to our adapter structure
1723 * @iue: Information Unit containing the MAD request
1725 * Must be called with interrupt lock held.
1727 static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue)
1729 struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
1730 struct viosrp_empty_iu *empty;
1731 long rc = ADAPT_SUCCESS;
1733 switch (be32_to_cpu(mad->type)) {
1734 case VIOSRP_EMPTY_IU_TYPE:
1735 empty = &vio_iu(iue)->mad.empty_iu;
1736 vscsi->empty_iu_id = be64_to_cpu(empty->buffer);
1737 vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag);
1738 mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1740 case VIOSRP_ADAPTER_INFO_TYPE:
1741 rc = ibmvscsis_adapter_info(vscsi, iue);
1743 case VIOSRP_CAPABILITIES_TYPE:
1744 rc = ibmvscsis_cap_mad(vscsi, iue);
1746 case VIOSRP_ENABLE_FAST_FAIL:
1747 if (vscsi->state == CONNECTED) {
1748 vscsi->fast_fail = true;
1749 mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1751 dev_warn(&vscsi->dev, "fast fail mad sent after login\n");
1752 mad->status = cpu_to_be16(VIOSRP_MAD_FAILED);
1756 mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED);
1764 * srp_snd_msg_failed() - Handle an error when sending a response
1765 * @vscsi: Pointer to our adapter structure
1766 * @rc: The return code from the h_send_crq command
1768 * Must be called with interrupt lock held.
1770 static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc)
1774 if (rc != H_DROPPED) {
1775 ibmvscsis_free_cmd_qs(vscsi);
1778 vscsi->flags |= CLIENT_FAILED;
1780 /* don't flag the same problem multiple times */
1781 if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
1782 vscsi->flags |= RESPONSE_Q_DOWN;
1783 if (!(vscsi->state & (ERR_DISCONNECT |
1784 ERR_DISCONNECT_RECONNECT |
1785 ERR_DISCONNECTED | UNDEFINED))) {
1786 dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n",
1787 vscsi->state, vscsi->flags, rc);
1789 ibmvscsis_post_disconnect(vscsi,
1790 ERR_DISCONNECT_RECONNECT, 0);
1796 * The response queue is full.
1797 * If the server is processing SRP requests, i.e.
1798 * the client has successfully done an
1799 * SRP_LOGIN, then it will wait forever for room in
1800 * the queue. However if the system admin
1801 * is attempting to unconfigure the server then one
1802 * or more children will be in a state where
1803 * they are being removed. So if there is even one
1804 * child being removed then the driver assumes
1805 * the system admin is attempting to break the
1806 * connection with the client and MAX_TIMER_POPS
1809 if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) ||
1810 (vscsi->state == SRP_PROCESSING)) {
1811 dev_dbg(&vscsi->dev, "snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n",
1812 vscsi->flags, (int)vscsi->rsp_q_timer.started,
1813 vscsi->rsp_q_timer.timer_pops);
1816 * Check if the timer is running; if it
1817 * is not then start it up.
1819 if (!vscsi->rsp_q_timer.started) {
1820 if (vscsi->rsp_q_timer.timer_pops <
1822 kt = WAIT_NANO_SECONDS;
1825 * slide the timeslice if the maximum
1826 * timer pops have already happened
1828 kt = ktime_set(WAIT_SECONDS, 0);
1831 vscsi->rsp_q_timer.started = true;
1832 hrtimer_start(&vscsi->rsp_q_timer.timer, kt,
1837 * TBD: Do we need to worry about this? Need to get
1841 * waited a long time and it appears the system admin
1842 * is bring this driver down
1844 vscsi->flags |= RESPONSE_Q_DOWN;
1845 ibmvscsis_free_cmd_qs(vscsi);
1847 * if the driver is already attempting to disconnect
1848 * from the client and has already logged an error
1849 * trace this event but don't put it in the error log
1851 if (!(vscsi->state & (ERR_DISCONNECT |
1852 ERR_DISCONNECT_RECONNECT |
1853 ERR_DISCONNECTED | UNDEFINED))) {
1854 dev_err(&vscsi->dev, "client crq full too long\n");
1855 ibmvscsis_post_disconnect(vscsi,
1856 ERR_DISCONNECT_RECONNECT,
1863 * ibmvscsis_send_messages() - Send a Response
1864 * @vscsi: Pointer to our adapter structure
1866 * Send a response, first checking the waiting queue. Responses are
1867 * sent in order they are received. If the response cannot be sent,
1868 * because the client queue is full, it stays on the waiting queue.
1871 * Called with interrupt lock held
1873 static void ibmvscsis_send_messages(struct scsi_info *vscsi)
1876 /* note do not attempt to access the IU_data_ptr with this pointer
1879 struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi;
1880 struct ibmvscsis_cmd *cmd, *nxt;
1881 long rc = ADAPT_SUCCESS;
1884 if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
1887 list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp,
1890 * Check to make sure abort cmd gets processed
1891 * prior to the abort tmr cmd
1893 if (cmd->flags & DELAY_SEND)
1896 if (cmd->abort_cmd) {
1898 cmd->abort_cmd->flags &= ~(DELAY_SEND);
1899 cmd->abort_cmd = NULL;
1903 * If CMD_T_ABORTED w/o CMD_T_TAS scenarios and
1904 * the case where LIO issued a
1905 * ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST
1906 * case then we dont send a response, since it
1909 if (cmd->se_cmd.transport_state & CMD_T_ABORTED &&
1910 !(cmd->se_cmd.transport_state & CMD_T_TAS)) {
1911 list_del(&cmd->list);
1912 ibmvscsis_free_cmd_resources(vscsi,
1915 * With a successfully aborted op
1916 * through LIO we want to increment the
1917 * the vscsi credit so that when we dont
1918 * send a rsp to the original scsi abort
1919 * op (h_send_crq), but the tm rsp to
1920 * the abort is sent, the credit is
1921 * correctly sent with the abort tm rsp.
1922 * We would need 1 for the abort tm rsp
1923 * and 1 credit for the aborted scsi op.
1924 * Thus we need to increment here.
1925 * Also we want to increment the credit
1926 * here because we want to make sure
1927 * cmd is actually released first
1928 * otherwise the client will think it
1929 * it can send a new cmd, and we could
1930 * find ourselves short of cmd elements.
1934 crq->valid = VALID_CMD_RESP_EL;
1935 crq->format = cmd->rsp.format;
1937 if (cmd->flags & CMD_FAST_FAIL)
1938 crq->status = VIOSRP_ADAPTER_FAIL;
1940 crq->IU_length = cpu_to_be16(cmd->rsp.len);
1942 rc = h_send_crq(vscsi->dma_dev->unit_address,
1943 be64_to_cpu(msg_hi),
1944 be64_to_cpu(cmd->rsp.tag));
1946 dev_dbg(&vscsi->dev, "send_messages: cmd %p, tag 0x%llx, rc %ld\n",
1947 cmd, be64_to_cpu(cmd->rsp.tag),
1950 /* if all ok free up the command
1953 if (rc == H_SUCCESS) {
1954 /* some movement has occurred */
1955 vscsi->rsp_q_timer.timer_pops = 0;
1956 list_del(&cmd->list);
1958 ibmvscsis_free_cmd_resources(vscsi,
1961 srp_snd_msg_failed(vscsi, rc);
1970 * The timer could pop with the queue empty. If
1971 * this happens, rc will always indicate a
1972 * success; clear the pop count.
1974 vscsi->rsp_q_timer.timer_pops = 0;
1977 ibmvscsis_free_cmd_qs(vscsi);
1981 /* Called with intr lock held */
1982 static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi,
1983 struct ibmvscsis_cmd *cmd,
1984 struct viosrp_crq *crq)
1986 struct iu_entry *iue = cmd->iue;
1987 struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
1992 rc = h_copy_rdma(sizeof(struct mad_common),
1993 vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
1994 vscsi->dds.window[REMOTE].liobn,
1995 be64_to_cpu(crq->IU_data_ptr));
1997 cmd->rsp.format = VIOSRP_MAD_FORMAT;
1998 cmd->rsp.len = sizeof(struct mad_common);
1999 cmd->rsp.tag = mad->tag;
2000 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2001 ibmvscsis_send_messages(vscsi);
2003 dev_dbg(&vscsi->dev, "Error sending mad response, rc %ld\n",
2005 if (rc == H_PERMISSION) {
2006 if (connection_broken(vscsi))
2007 flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
2009 dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n",
2012 ibmvscsis_free_cmd_resources(vscsi, cmd);
2013 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2019 * ibmvscsis_mad() - Service a MAnagement Data gram.
2020 * @vscsi: Pointer to our adapter structure
2021 * @crq: Pointer to the CRQ entry containing the MAD request
2023 * EXECUTION ENVIRONMENT:
2024 * Interrupt, called with adapter lock held
2026 static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq)
2028 struct iu_entry *iue;
2029 struct ibmvscsis_cmd *cmd;
2030 struct mad_common *mad;
2031 long rc = ADAPT_SUCCESS;
2033 switch (vscsi->state) {
2035 * We have not exchanged Init Msgs yet, so this MAD was sent
2036 * before the last Transport Event; client will not be
2037 * expecting a response.
2039 case WAIT_CONNECTION:
2040 dev_dbg(&vscsi->dev, "mad: in Wait Connection state, ignoring MAD, flags %d\n",
2042 return ADAPT_SUCCESS;
2044 case SRP_PROCESSING:
2049 * We should never get here while we're in these states.
2050 * Just log an error and get out.
2054 case ERR_DISCONNECT:
2055 case ERR_DISCONNECT_RECONNECT:
2057 dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n",
2059 return ADAPT_SUCCESS;
2062 cmd = ibmvscsis_get_free_cmd(vscsi);
2064 dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n",
2066 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2070 cmd->type = ADAPTER_MAD;
2072 rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
2074 mad = (struct mad_common *)&vio_iu(iue)->mad;
2076 dev_dbg(&vscsi->dev, "mad: type %d\n", be32_to_cpu(mad->type));
2078 rc = ibmvscsis_process_mad(vscsi, iue);
2080 dev_dbg(&vscsi->dev, "mad: status %hd, rc %ld\n",
2081 be16_to_cpu(mad->status), rc);
2084 ibmvscsis_send_mad_resp(vscsi, cmd, crq);
2086 ibmvscsis_free_cmd_resources(vscsi, cmd);
2089 dev_dbg(&vscsi->dev, "Leaving mad, rc %ld\n", rc);
2094 * ibmvscsis_login_rsp() - Create/copy a login response notice to the client
2095 * @vscsi: Pointer to our adapter structure
2096 * @cmd: Pointer to the command for the SRP Login request
2098 * EXECUTION ENVIRONMENT:
2099 * Interrupt, interrupt lock held
2101 static long ibmvscsis_login_rsp(struct scsi_info *vscsi,
2102 struct ibmvscsis_cmd *cmd)
2104 struct iu_entry *iue = cmd->iue;
2105 struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp;
2106 struct format_code *fmt;
2108 long rc = ADAPT_SUCCESS;
2110 memset(rsp, 0, sizeof(struct srp_login_rsp));
2112 rsp->opcode = SRP_LOGIN_RSP;
2113 rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit);
2114 rsp->tag = cmd->rsp.tag;
2115 rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
2116 rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
2117 fmt = (struct format_code *)&rsp->buf_fmt;
2118 fmt->buffers = SUPPORTED_FORMATS;
2121 cmd->rsp.len = sizeof(struct srp_login_rsp);
2124 rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
2125 iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
2126 be64_to_cpu(iue->remote_token));
2133 if (connection_broken(vscsi))
2134 flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
2135 dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
2137 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2143 dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
2145 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2153 * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client
2154 * @vscsi: Pointer to our adapter structure
2155 * @cmd: Pointer to the command for the SRP Login request
2156 * @reason: The reason the SRP Login is being rejected, per SRP protocol
2158 * EXECUTION ENVIRONMENT:
2159 * Interrupt, interrupt lock held
2161 static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi,
2162 struct ibmvscsis_cmd *cmd, u32 reason)
2164 struct iu_entry *iue = cmd->iue;
2165 struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej;
2166 struct format_code *fmt;
2168 long rc = ADAPT_SUCCESS;
2170 memset(rej, 0, sizeof(*rej));
2172 rej->opcode = SRP_LOGIN_REJ;
2173 rej->reason = cpu_to_be32(reason);
2174 rej->tag = cmd->rsp.tag;
2175 fmt = (struct format_code *)&rej->buf_fmt;
2176 fmt->buffers = SUPPORTED_FORMATS;
2178 cmd->rsp.len = sizeof(*rej);
2181 rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
2182 iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
2183 be64_to_cpu(iue->remote_token));
2189 if (connection_broken(vscsi))
2190 flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
2191 dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
2193 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2199 dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
2201 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2208 static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport)
2210 char *name = tport->tport_name;
2211 struct ibmvscsis_nexus *nexus;
2212 struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
2215 if (tport->ibmv_nexus) {
2216 dev_dbg(&vscsi->dev, "tport->ibmv_nexus already exists\n");
2220 nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
2222 dev_err(&vscsi->dev, "Unable to allocate struct ibmvscsis_nexus\n");
2226 nexus->se_sess = target_setup_session(&tport->se_tpg, 0, 0,
2227 TARGET_PROT_NORMAL, name, nexus,
2229 if (IS_ERR(nexus->se_sess)) {
2230 rc = PTR_ERR(nexus->se_sess);
2231 goto transport_init_fail;
2234 tport->ibmv_nexus = nexus;
2238 transport_init_fail:
2243 static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport)
2245 struct se_session *se_sess;
2246 struct ibmvscsis_nexus *nexus;
2248 nexus = tport->ibmv_nexus;
2252 se_sess = nexus->se_sess;
2257 * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port
2259 target_remove_session(se_sess);
2260 tport->ibmv_nexus = NULL;
2267 * ibmvscsis_srp_login() - Process an SRP Login Request
2268 * @vscsi: Pointer to our adapter structure
2269 * @cmd: Command element to use to process the SRP Login request
2270 * @crq: Pointer to CRQ entry containing the SRP Login request
2272 * EXECUTION ENVIRONMENT:
2273 * Interrupt, called with interrupt lock held
2275 static long ibmvscsis_srp_login(struct scsi_info *vscsi,
2276 struct ibmvscsis_cmd *cmd,
2277 struct viosrp_crq *crq)
2279 struct iu_entry *iue = cmd->iue;
2280 struct srp_login_req *req = &vio_iu(iue)->srp.login_req;
2282 __be64 id_extension;
2285 struct format_code *fmt;
2287 long rc = ADAPT_SUCCESS;
2289 iport = (struct port_id *)req->initiator_port_id;
2290 tport = (struct port_id *)req->target_port_id;
2291 fmt = (struct format_code *)&req->req_buf_fmt;
2292 if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN)
2293 reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE;
2294 else if (be32_to_cpu(req->req_it_iu_len) < 64)
2295 reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
2296 else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) ||
2297 (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1)))
2298 reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL;
2299 else if (req->req_flags & SRP_MULTICHAN_MULTI)
2300 reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED;
2301 else if (fmt->buffers & (~SUPPORTED_FORMATS))
2302 reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
2303 else if ((fmt->buffers & SUPPORTED_FORMATS) == 0)
2304 reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
2306 if (vscsi->state == SRP_PROCESSING)
2307 reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED;
2309 rc = ibmvscsis_make_nexus(&vscsi->tport);
2311 reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
2313 cmd->rsp.format = VIOSRP_SRP_FORMAT;
2314 cmd->rsp.tag = req->tag;
2316 dev_dbg(&vscsi->dev, "srp_login: reason 0x%x\n", reason);
2319 rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason);
2321 rc = ibmvscsis_login_rsp(vscsi, cmd);
2325 vscsi->state = SRP_PROCESSING;
2327 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2328 ibmvscsis_send_messages(vscsi);
2330 ibmvscsis_free_cmd_resources(vscsi, cmd);
2333 dev_dbg(&vscsi->dev, "Leaving srp_login, rc %ld\n", rc);
2338 * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus
2339 * @vscsi: Pointer to our adapter structure
2340 * @cmd: Command element to use to process the Implicit Logout request
2341 * @crq: Pointer to CRQ entry containing the Implicit Logout request
2343 * Do the logic to close the I_T nexus. This function may not
2344 * behave to specification.
2346 * EXECUTION ENVIRONMENT:
2347 * Interrupt, interrupt lock held
2349 static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi,
2350 struct ibmvscsis_cmd *cmd,
2351 struct viosrp_crq *crq)
2353 struct iu_entry *iue = cmd->iue;
2354 struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout;
2356 if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) ||
2357 !list_empty(&vscsi->waiting_rsp)) {
2358 dev_err(&vscsi->dev, "i_logout: outstanding work\n");
2359 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
2361 cmd->rsp.format = SRP_FORMAT;
2362 cmd->rsp.tag = log_out->tag;
2363 cmd->rsp.len = sizeof(struct mad_common);
2364 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2365 ibmvscsis_send_messages(vscsi);
2367 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
2370 return ADAPT_SUCCESS;
2373 /* Called with intr lock held */
2374 static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq)
2376 struct ibmvscsis_cmd *cmd;
2377 struct iu_entry *iue;
2378 struct srp_cmd *srp;
2379 struct srp_tsk_mgmt *tsk;
2382 if (vscsi->request_limit - vscsi->debit <= 0) {
2383 /* Client has exceeded request limit */
2384 dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n",
2385 vscsi->request_limit, vscsi->debit);
2386 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2390 cmd = ibmvscsis_get_free_cmd(vscsi);
2392 dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n",
2394 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2398 srp = &vio_iu(iue)->srp.cmd;
2400 rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
2402 ibmvscsis_free_cmd_resources(vscsi, cmd);
2406 if (vscsi->state == SRP_PROCESSING) {
2407 switch (srp->opcode) {
2409 rc = ibmvscsis_srp_login(vscsi, cmd, crq);
2413 tsk = &vio_iu(iue)->srp.tsk_mgmt;
2414 dev_dbg(&vscsi->dev, "tsk_mgmt tag: %llu (0x%llx)\n",
2415 tsk->tag, tsk->tag);
2416 cmd->rsp.tag = tsk->tag;
2418 cmd->type = TASK_MANAGEMENT;
2419 list_add_tail(&cmd->list, &vscsi->schedule_q);
2420 queue_work(vscsi->work_q, &cmd->work);
2424 dev_dbg(&vscsi->dev, "srp_cmd tag: %llu (0x%llx)\n",
2425 srp->tag, srp->tag);
2426 cmd->rsp.tag = srp->tag;
2428 cmd->type = SCSI_CDB;
2430 * We want to keep track of work waiting for
2433 list_add_tail(&cmd->list, &vscsi->schedule_q);
2434 queue_work(vscsi->work_q, &cmd->work);
2438 rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq);
2444 ibmvscsis_free_cmd_resources(vscsi, cmd);
2445 dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n",
2447 ibmvscsis_post_disconnect(vscsi,
2448 ERR_DISCONNECT_RECONNECT, 0);
2451 } else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) {
2452 rc = ibmvscsis_srp_login(vscsi, cmd, crq);
2454 ibmvscsis_free_cmd_resources(vscsi, cmd);
2455 dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n",
2457 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2462 * ibmvscsis_ping_response() - Respond to a ping request
2463 * @vscsi: Pointer to our adapter structure
2465 * Let the client know that the server is alive and waiting on
2466 * its native I/O stack.
2467 * If any type of error occurs from the call to queue a ping
2468 * response then the client is either not accepting or receiving
2469 * interrupts. Disconnect with an error.
2471 * EXECUTION ENVIRONMENT:
2472 * Interrupt, interrupt lock held
2474 static long ibmvscsis_ping_response(struct scsi_info *vscsi)
2476 struct viosrp_crq *crq;
2477 u64 buffer[2] = { 0, 0 };
2480 crq = (struct viosrp_crq *)&buffer;
2481 crq->valid = VALID_CMD_RESP_EL;
2482 crq->format = (u8)MESSAGE_IN_CRQ;
2483 crq->status = PING_RESPONSE;
2485 rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
2486 cpu_to_be64(buffer[MSG_LOW]));
2492 vscsi->flags |= CLIENT_FAILED;
2495 vscsi->flags |= RESPONSE_Q_DOWN;
2498 dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n",
2500 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2503 dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n",
2505 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
2513 * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue.
2514 * @vscsi: Pointer to our adapter structure
2515 * @crq: Pointer to CRQ element containing the SRP request
2517 * This function will return success if the command queue element is valid
2518 * and the srp iu or MAD request it pointed to was also valid. That does
2519 * not mean that an error was not returned to the client.
2521 * EXECUTION ENVIRONMENT:
2522 * Interrupt, intr lock held
2524 static long ibmvscsis_parse_command(struct scsi_info *vscsi,
2525 struct viosrp_crq *crq)
2527 long rc = ADAPT_SUCCESS;
2529 switch (crq->valid) {
2530 case VALID_CMD_RESP_EL:
2531 switch (crq->format) {
2536 if (vscsi->flags & PROCESSING_MAD) {
2538 dev_err(&vscsi->dev, "parse_command: already processing mad\n");
2539 ibmvscsis_post_disconnect(vscsi,
2540 ERR_DISCONNECT_RECONNECT,
2543 vscsi->flags |= PROCESSING_MAD;
2544 rc = ibmvscsis_mad(vscsi, crq);
2549 ibmvscsis_srp_cmd(vscsi, crq);
2552 case MESSAGE_IN_CRQ:
2553 if (crq->status == PING)
2554 ibmvscsis_ping_response(vscsi);
2558 dev_err(&vscsi->dev, "parse_command: invalid format %d\n",
2560 ibmvscsis_post_disconnect(vscsi,
2561 ERR_DISCONNECT_RECONNECT, 0);
2566 case VALID_TRANS_EVENT:
2567 rc = ibmvscsis_trans_event(vscsi, crq);
2570 case VALID_INIT_MSG:
2571 rc = ibmvscsis_init_msg(vscsi, crq);
2575 dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n",
2577 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2582 * Return only what the interrupt handler cares
2583 * about. Most errors we keep right on trucking.
2585 rc = vscsi->flags & SCHEDULE_DISCONNECT;
2590 static int read_dma_window(struct scsi_info *vscsi)
2592 struct vio_dev *vdev = vscsi->dma_dev;
2593 const __be32 *dma_window;
2596 /* TODO Using of_parse_dma_window would be better, but it doesn't give
2597 * a way to read multiple windows without already knowing the size of
2598 * a window or the number of windows.
2600 dma_window = (const __be32 *)vio_get_attribute(vdev,
2601 "ibm,my-dma-window",
2604 dev_err(&vscsi->dev, "Couldn't find ibm,my-dma-window property\n");
2608 vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window);
2611 prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells",
2614 dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-address-cells property\n");
2617 dma_window += be32_to_cpu(*prop);
2620 prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells",
2623 dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-size-cells property\n");
2626 dma_window += be32_to_cpu(*prop);
2629 /* dma_window should point to the second window now */
2630 vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window);
2635 static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name)
2637 struct ibmvscsis_tport *tport = NULL;
2638 struct vio_dev *vdev;
2639 struct scsi_info *vscsi;
2641 spin_lock_bh(&ibmvscsis_dev_lock);
2642 list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) {
2643 vdev = vscsi->dma_dev;
2644 if (!strcmp(dev_name(&vdev->dev), name)) {
2645 tport = &vscsi->tport;
2649 spin_unlock_bh(&ibmvscsis_dev_lock);
2655 * ibmvscsis_parse_cmd() - Parse SRP Command
2656 * @vscsi: Pointer to our adapter structure
2657 * @cmd: Pointer to command element with SRP command
2659 * Parse the srp command; if it is valid then submit it to tcm.
2660 * Note: The return code does not reflect the status of the SCSI CDB.
2662 * EXECUTION ENVIRONMENT:
2665 static void ibmvscsis_parse_cmd(struct scsi_info *vscsi,
2666 struct ibmvscsis_cmd *cmd)
2668 struct iu_entry *iue = cmd->iue;
2669 struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
2670 struct ibmvscsis_nexus *nexus;
2672 enum dma_data_direction dir;
2675 nexus = vscsi->tport.ibmv_nexus;
2677 * additional length in bytes. Note that the SRP spec says that
2678 * additional length is in 4-byte words, but technically the
2679 * additional length field is only the upper 6 bits of the byte.
2680 * The lower 2 bits are reserved. If the lower 2 bits are 0 (as
2681 * all reserved fields should be), then interpreting the byte as
2682 * an int will yield the length in bytes.
2684 if (srp->add_cdb_len & 0x03) {
2685 dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n");
2686 spin_lock_bh(&vscsi->intr_lock);
2687 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2688 ibmvscsis_free_cmd_resources(vscsi, cmd);
2689 spin_unlock_bh(&vscsi->intr_lock);
2693 if (srp_get_desc_table(srp, &dir, &data_len)) {
2694 dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n",
2699 cmd->rsp.sol_not = srp->sol_not;
2701 switch (srp->task_attr) {
2702 case SRP_SIMPLE_TASK:
2703 attr = TCM_SIMPLE_TAG;
2705 case SRP_ORDERED_TASK:
2706 attr = TCM_ORDERED_TAG;
2709 attr = TCM_HEAD_TAG;
2715 dev_err(&vscsi->dev, "Invalid task attribute %d\n",
2720 cmd->se_cmd.tag = be64_to_cpu(srp->tag);
2722 spin_lock_bh(&vscsi->intr_lock);
2723 list_add_tail(&cmd->list, &vscsi->active_q);
2724 spin_unlock_bh(&vscsi->intr_lock);
2726 srp->lun.scsi_lun[0] &= 0x3f;
2728 target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb,
2729 cmd->sense_buf, scsilun_to_int(&srp->lun),
2730 data_len, attr, dir, 0);
2734 spin_lock_bh(&vscsi->intr_lock);
2735 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2736 spin_unlock_bh(&vscsi->intr_lock);
2740 * ibmvscsis_parse_task() - Parse SRP Task Management Request
2741 * @vscsi: Pointer to our adapter structure
2742 * @cmd: Pointer to command element with SRP task management request
2744 * Parse the srp task management request; if it is valid then submit it to tcm.
2745 * Note: The return code does not reflect the status of the task management
2748 * EXECUTION ENVIRONMENT:
2751 static void ibmvscsis_parse_task(struct scsi_info *vscsi,
2752 struct ibmvscsis_cmd *cmd)
2754 struct iu_entry *iue = cmd->iue;
2755 struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
2757 u64 tag_to_abort = 0;
2759 struct ibmvscsis_nexus *nexus;
2761 nexus = vscsi->tport.ibmv_nexus;
2763 cmd->rsp.sol_not = srp_tsk->sol_not;
2765 switch (srp_tsk->tsk_mgmt_func) {
2766 case SRP_TSK_ABORT_TASK:
2767 tcm_type = TMR_ABORT_TASK;
2768 tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
2770 case SRP_TSK_ABORT_TASK_SET:
2771 tcm_type = TMR_ABORT_TASK_SET;
2773 case SRP_TSK_CLEAR_TASK_SET:
2774 tcm_type = TMR_CLEAR_TASK_SET;
2776 case SRP_TSK_LUN_RESET:
2777 tcm_type = TMR_LUN_RESET;
2779 case SRP_TSK_CLEAR_ACA:
2780 tcm_type = TMR_CLEAR_ACA;
2783 dev_err(&vscsi->dev, "unknown task mgmt func %d\n",
2784 srp_tsk->tsk_mgmt_func);
2785 cmd->se_cmd.se_tmr_req->response =
2786 TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2792 cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag);
2794 spin_lock_bh(&vscsi->intr_lock);
2795 list_add_tail(&cmd->list, &vscsi->active_q);
2796 spin_unlock_bh(&vscsi->intr_lock);
2798 srp_tsk->lun.scsi_lun[0] &= 0x3f;
2800 dev_dbg(&vscsi->dev, "calling submit_tmr, func %d\n",
2801 srp_tsk->tsk_mgmt_func);
2802 rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL,
2803 scsilun_to_int(&srp_tsk->lun), srp_tsk,
2804 tcm_type, GFP_KERNEL, tag_to_abort, 0);
2806 dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n",
2808 spin_lock_bh(&vscsi->intr_lock);
2809 list_del(&cmd->list);
2810 spin_unlock_bh(&vscsi->intr_lock);
2811 cmd->se_cmd.se_tmr_req->response =
2812 TMR_FUNCTION_REJECTED;
2817 transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0);
2820 static void ibmvscsis_scheduler(struct work_struct *work)
2822 struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd,
2824 struct scsi_info *vscsi = cmd->adapter;
2826 spin_lock_bh(&vscsi->intr_lock);
2828 /* Remove from schedule_q */
2829 list_del(&cmd->list);
2831 /* Don't submit cmd if we're disconnecting */
2832 if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) {
2833 ibmvscsis_free_cmd_resources(vscsi, cmd);
2835 /* ibmvscsis_disconnect might be waiting for us */
2836 if (list_empty(&vscsi->active_q) &&
2837 list_empty(&vscsi->schedule_q) &&
2838 (vscsi->flags & WAIT_FOR_IDLE)) {
2839 vscsi->flags &= ~WAIT_FOR_IDLE;
2840 complete(&vscsi->wait_idle);
2843 spin_unlock_bh(&vscsi->intr_lock);
2847 spin_unlock_bh(&vscsi->intr_lock);
2849 switch (cmd->type) {
2851 ibmvscsis_parse_cmd(vscsi, cmd);
2853 case TASK_MANAGEMENT:
2854 ibmvscsis_parse_task(vscsi, cmd);
2857 dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n",
2859 spin_lock_bh(&vscsi->intr_lock);
2860 ibmvscsis_free_cmd_resources(vscsi, cmd);
2861 spin_unlock_bh(&vscsi->intr_lock);
2866 static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num)
2868 struct ibmvscsis_cmd *cmd;
2871 INIT_LIST_HEAD(&vscsi->free_cmd);
2872 vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd),
2874 if (!vscsi->cmd_pool)
2877 for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num;
2879 cmd->abort_cmd = NULL;
2880 cmd->adapter = vscsi;
2881 INIT_WORK(&cmd->work, ibmvscsis_scheduler);
2882 list_add_tail(&cmd->list, &vscsi->free_cmd);
2888 static void ibmvscsis_free_cmds(struct scsi_info *vscsi)
2890 kfree(vscsi->cmd_pool);
2891 vscsi->cmd_pool = NULL;
2892 INIT_LIST_HEAD(&vscsi->free_cmd);
2896 * ibmvscsis_service_wait_q() - Service Waiting Queue
2897 * @timer: Pointer to timer which has expired
2899 * This routine is called when the timer pops to service the waiting
2900 * queue. Elements on the queue have completed, their responses have been
2901 * copied to the client, but the client's response queue was full so
2902 * the queue message could not be sent. The routine grabs the proper locks
2903 * and calls send messages.
2905 * EXECUTION ENVIRONMENT:
2906 * called at interrupt level
2908 static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer)
2910 struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer);
2911 struct scsi_info *vscsi = container_of(p_timer, struct scsi_info,
2914 spin_lock_bh(&vscsi->intr_lock);
2915 p_timer->timer_pops += 1;
2916 p_timer->started = false;
2917 ibmvscsis_send_messages(vscsi);
2918 spin_unlock_bh(&vscsi->intr_lock);
2920 return HRTIMER_NORESTART;
2923 static long ibmvscsis_alloctimer(struct scsi_info *vscsi)
2925 struct timer_cb *p_timer;
2927 p_timer = &vscsi->rsp_q_timer;
2928 hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2930 p_timer->timer.function = ibmvscsis_service_wait_q;
2931 p_timer->started = false;
2932 p_timer->timer_pops = 0;
2934 return ADAPT_SUCCESS;
2937 static void ibmvscsis_freetimer(struct scsi_info *vscsi)
2939 struct timer_cb *p_timer;
2941 p_timer = &vscsi->rsp_q_timer;
2943 (void)hrtimer_cancel(&p_timer->timer);
2945 p_timer->started = false;
2946 p_timer->timer_pops = 0;
2949 static irqreturn_t ibmvscsis_interrupt(int dummy, void *data)
2951 struct scsi_info *vscsi = data;
2953 vio_disable_interrupts(vscsi->dma_dev);
2954 tasklet_schedule(&vscsi->work_task);
2960 * ibmvscsis_enable_change_state() - Set new state based on enabled status
2961 * @vscsi: Pointer to our adapter structure
2963 * This function determines our new state now that we are enabled. This
2964 * may involve sending an Init Complete message to the client.
2966 * Must be called with interrupt lock held.
2968 static long ibmvscsis_enable_change_state(struct scsi_info *vscsi)
2971 long rc = ADAPT_SUCCESS;
2973 bytes = vscsi->cmd_q.size * PAGE_SIZE;
2974 rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes);
2975 if (rc == H_CLOSED || rc == H_SUCCESS) {
2976 vscsi->state = WAIT_CONNECTION;
2977 rc = ibmvscsis_establish_new_q(vscsi);
2980 if (rc != ADAPT_SUCCESS) {
2981 vscsi->state = ERR_DISCONNECTED;
2982 vscsi->flags |= RESPONSE_Q_DOWN;
2989 * ibmvscsis_create_command_q() - Create Command Queue
2990 * @vscsi: Pointer to our adapter structure
2991 * @num_cmds: Currently unused. In the future, may be used to determine
2992 * the size of the CRQ.
2994 * Allocates memory for command queue maps remote memory into an ioba
2995 * initializes the command response queue
2997 * EXECUTION ENVIRONMENT:
2998 * Process level only
3000 static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds)
3003 struct vio_dev *vdev = vscsi->dma_dev;
3005 /* We might support multiple pages in the future, but just 1 for now */
3008 vscsi->cmd_q.size = pages;
3010 vscsi->cmd_q.base_addr =
3011 (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
3012 if (!vscsi->cmd_q.base_addr)
3015 vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1;
3017 vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev,
3018 vscsi->cmd_q.base_addr,
3019 PAGE_SIZE, DMA_BIDIRECTIONAL);
3020 if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) {
3021 free_page((unsigned long)vscsi->cmd_q.base_addr);
3029 * ibmvscsis_destroy_command_q - Destroy Command Queue
3030 * @vscsi: Pointer to our adapter structure
3032 * Releases memory for command queue and unmaps mapped remote memory.
3034 * EXECUTION ENVIRONMENT:
3035 * Process level only
3037 static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi)
3039 dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token,
3040 PAGE_SIZE, DMA_BIDIRECTIONAL);
3041 free_page((unsigned long)vscsi->cmd_q.base_addr);
3042 vscsi->cmd_q.base_addr = NULL;
3043 vscsi->state = NO_QUEUE;
3046 static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi,
3047 struct ibmvscsis_cmd *cmd)
3049 struct iu_entry *iue = cmd->iue;
3050 struct se_cmd *se_cmd = &cmd->se_cmd;
3051 struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
3052 struct scsi_sense_hdr sshdr;
3053 u8 rc = se_cmd->scsi_status;
3055 if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb)))
3056 if (scsi_normalize_sense(se_cmd->sense_buffer,
3057 se_cmd->scsi_sense_length, &sshdr))
3058 if (sshdr.sense_key == HARDWARE_ERROR &&
3059 (se_cmd->residual_count == 0 ||
3060 se_cmd->residual_count == se_cmd->data_length)) {
3062 cmd->flags |= CMD_FAST_FAIL;
3069 * srp_build_response() - Build an SRP response buffer
3070 * @vscsi: Pointer to our adapter structure
3071 * @cmd: Pointer to command for which to send the response
3072 * @len_p: Where to return the length of the IU response sent. This
3073 * is needed to construct the CRQ response.
3075 * Build the SRP response buffer and copy it to the client's memory space.
3077 static long srp_build_response(struct scsi_info *vscsi,
3078 struct ibmvscsis_cmd *cmd, uint *len_p)
3080 struct iu_entry *iue = cmd->iue;
3081 struct se_cmd *se_cmd = &cmd->se_cmd;
3082 struct srp_rsp *rsp;
3087 long rc = ADAPT_SUCCESS;
3089 spin_lock_bh(&vscsi->intr_lock);
3091 rsp = &vio_iu(iue)->srp.rsp;
3093 memset(rsp, 0, len);
3096 rsp->opcode = SRP_RSP;
3098 rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit);
3099 rsp->tag = cmd->rsp.tag;
3102 if (cmd->type == SCSI_CDB) {
3103 rsp->status = ibmvscsis_fast_fail(vscsi, cmd);
3105 dev_dbg(&vscsi->dev, "build_resp: cmd %p, scsi status %d\n",
3106 cmd, (int)rsp->status);
3107 ibmvscsis_determine_resid(se_cmd, rsp);
3108 if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) {
3109 rsp->sense_data_len =
3110 cpu_to_be32(se_cmd->scsi_sense_length);
3111 rsp->flags |= SRP_RSP_FLAG_SNSVALID;
3112 len += se_cmd->scsi_sense_length;
3113 memcpy(data, se_cmd->sense_buffer,
3114 se_cmd->scsi_sense_length);
3116 rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3118 } else if (cmd->flags & CMD_FAST_FAIL) {
3119 dev_dbg(&vscsi->dev, "build_resp: cmd %p, fast fail\n",
3121 rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3124 rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
3128 /* this is task management */
3130 rsp->resp_data_len = cpu_to_be32(4);
3131 rsp->flags |= SRP_RSP_FLAG_RSPVALID;
3133 switch (se_cmd->se_tmr_req->response) {
3134 case TMR_FUNCTION_COMPLETE:
3135 case TMR_TASK_DOES_NOT_EXIST:
3136 rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE;
3137 rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
3140 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3141 case TMR_LUN_DOES_NOT_EXIST:
3142 rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED;
3143 rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3146 case TMR_FUNCTION_FAILED:
3147 case TMR_FUNCTION_REJECTED:
3149 rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED;
3150 rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3155 tsk_status = (u32 *)data;
3156 *tsk_status = cpu_to_be32(rsp_code);
3157 data = (char *)(tsk_status + 1);
3162 rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
3163 vscsi->dds.window[REMOTE].liobn,
3164 be64_to_cpu(iue->remote_token));
3172 if (connection_broken(vscsi))
3173 vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED;
3175 dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n",
3176 rc, vscsi->flags, vscsi->state);
3181 dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n",
3186 spin_unlock_bh(&vscsi->intr_lock);
3191 static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg,
3192 int nsg, struct srp_direct_buf *md, int nmd,
3193 enum dma_data_direction dir, unsigned int bytes)
3195 struct iu_entry *iue = cmd->iue;
3196 struct srp_target *target = iue->target;
3197 struct scsi_info *vscsi = target->ldata;
3198 struct scatterlist *sgp;
3199 dma_addr_t client_ioba, server_ioba;
3201 ulong client_len, server_len;
3216 if (client_len == 0) {
3217 if (md_idx >= nmd) {
3218 dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n");
3222 client_ioba = be64_to_cpu(md[md_idx].va);
3223 client_len = be32_to_cpu(md[md_idx].len);
3225 if (server_len == 0) {
3227 dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n");
3231 server_ioba = sg_dma_address(sgp);
3232 server_len = sg_dma_len(sgp);
3237 if (buf_len > client_len)
3238 buf_len = client_len;
3240 if (buf_len > server_len)
3241 buf_len = server_len;
3243 if (buf_len > max_vdma_size)
3244 buf_len = max_vdma_size;
3246 if (dir == DMA_TO_DEVICE) {
3247 /* read from client */
3248 rc = h_copy_rdma(buf_len,
3249 vscsi->dds.window[REMOTE].liobn,
3251 vscsi->dds.window[LOCAL].liobn,
3254 /* The h_copy_rdma will cause phyp, running in another
3255 * partition, to read memory, so we need to make sure
3256 * the data has been written out, hence these syncs.
3258 /* ensure that everything is in memory */
3260 /* ensure that memory has been made visible */
3262 rc = h_copy_rdma(buf_len,
3263 vscsi->dds.window[LOCAL].liobn,
3265 vscsi->dds.window[REMOTE].liobn,
3274 if (connection_broken(vscsi)) {
3275 spin_lock_bh(&vscsi->intr_lock);
3277 (RESPONSE_Q_DOWN | CLIENT_FAILED);
3278 spin_unlock_bh(&vscsi->intr_lock);
3280 dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n",
3285 dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n",
3293 client_len -= buf_len;
3294 if (client_len == 0)
3297 client_ioba += buf_len;
3299 server_len -= buf_len;
3300 if (server_len == 0)
3303 server_ioba += buf_len;
3314 * ibmvscsis_handle_crq() - Handle CRQ
3315 * @data: Pointer to our adapter structure
3317 * Read the command elements from the command queue and copy the payloads
3318 * associated with the command elements to local memory and execute the
3321 * Note: this is an edge triggered interrupt. It can not be shared.
3323 static void ibmvscsis_handle_crq(unsigned long data)
3325 struct scsi_info *vscsi = (struct scsi_info *)data;
3326 struct viosrp_crq *crq;
3331 spin_lock_bh(&vscsi->intr_lock);
3333 dev_dbg(&vscsi->dev, "got interrupt\n");
3336 * if we are in a path where we are waiting for all pending commands
3337 * to complete because we received a transport event and anything in
3338 * the command queue is for a new connection, do nothing
3340 if (TARGET_STOP(vscsi)) {
3341 vio_enable_interrupts(vscsi->dma_dev);
3343 dev_dbg(&vscsi->dev, "handle_crq, don't process: flags 0x%x, state 0x%hx\n",
3344 vscsi->flags, vscsi->state);
3345 spin_unlock_bh(&vscsi->intr_lock);
3349 rc = vscsi->flags & SCHEDULE_DISCONNECT;
3350 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
3356 * These are edege triggered interrupts. After dropping out of
3357 * the while loop, the code must check for work since an
3358 * interrupt could be lost, and an elment be left on the queue,
3362 vscsi->cmd_q.index =
3363 (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;
3366 rc = ibmvscsis_parse_command(vscsi, crq);
3368 if ((uint)crq->valid == VALID_TRANS_EVENT) {
3370 * must service the transport layer events even
3371 * in an error state, dont break out until all
3372 * the consecutive transport events have been
3375 rc = ibmvscsis_trans_event(vscsi, crq);
3376 } else if (vscsi->flags & TRANS_EVENT) {
3378 * if a transport event has occurred leave
3379 * everything but transport events on the queue
3381 * need to decrement the queue index so we can
3382 * look at the element again
3384 if (vscsi->cmd_q.index)
3385 vscsi->cmd_q.index -= 1;
3388 * index is at 0 it just wrapped.
3389 * have it index last element in q
3391 vscsi->cmd_q.index = vscsi->cmd_q.mask;
3396 crq->valid = INVALIDATE_CMD_RESP_EL;
3398 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
3405 vio_enable_interrupts(vscsi->dma_dev);
3407 dev_dbg(&vscsi->dev, "handle_crq, reenabling interrupts\n");
3414 dev_dbg(&vscsi->dev, "handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n",
3415 vscsi->flags, vscsi->state, vscsi->cmd_q.index);
3418 dev_dbg(&vscsi->dev, "Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n",
3419 (int)list_empty(&vscsi->schedule_q), vscsi->flags,
3422 spin_unlock_bh(&vscsi->intr_lock);
3425 static int ibmvscsis_probe(struct vio_dev *vdev,
3426 const struct vio_device_id *id)
3428 struct scsi_info *vscsi;
3433 vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL);
3436 dev_err(&vdev->dev, "probe: allocation of adapter failed\n");
3440 vscsi->dma_dev = vdev;
3441 vscsi->dev = vdev->dev;
3442 INIT_LIST_HEAD(&vscsi->schedule_q);
3443 INIT_LIST_HEAD(&vscsi->waiting_rsp);
3444 INIT_LIST_HEAD(&vscsi->active_q);
3446 snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s",
3447 dev_name(&vdev->dev));
3449 dev_dbg(&vscsi->dev, "probe tport_name: %s\n", vscsi->tport.tport_name);
3451 rc = read_dma_window(vscsi);
3454 dev_dbg(&vscsi->dev, "Probe: liobn 0x%x, riobn 0x%x\n",
3455 vscsi->dds.window[LOCAL].liobn,
3456 vscsi->dds.window[REMOTE].liobn);
3458 snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name);
3460 vscsi->dds.unit_id = vdev->unit_address;
3461 strscpy(vscsi->dds.partition_name, partition_name,
3462 sizeof(vscsi->dds.partition_name));
3463 vscsi->dds.partition_num = partition_number;
3465 spin_lock_bh(&ibmvscsis_dev_lock);
3466 list_add_tail(&vscsi->list, &ibmvscsis_dev_list);
3467 spin_unlock_bh(&ibmvscsis_dev_lock);
3470 * TBD: How do we determine # of cmds to request? Do we know how
3471 * many "children" we have?
3473 vscsi->request_limit = INITIAL_SRP_LIMIT;
3474 rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit,
3479 vscsi->target.ldata = vscsi;
3481 rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit);
3483 dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n",
3484 rc, vscsi->request_limit);
3489 * Note: the lock is used in freeing timers, so must initialize
3490 * first so that ordering in case of error is correct.
3492 spin_lock_init(&vscsi->intr_lock);
3494 rc = ibmvscsis_alloctimer(vscsi);
3496 dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc);
3500 rc = ibmvscsis_create_command_q(vscsi, 256);
3502 dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n",
3507 vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
3508 if (!vscsi->map_buf) {
3510 dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n");
3514 vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE,
3516 if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) {
3518 dev_err(&vscsi->dev, "probe: error mapping command buffer\n");
3522 hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
3523 (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
3525 if (hrc == H_SUCCESS)
3526 vscsi->client_data.partition_number =
3527 be64_to_cpu(*(u64 *)vscsi->map_buf);
3529 * We expect the VIOCTL to fail if we're configured as "any
3530 * client can connect" and the client isn't activated yet.
3531 * We'll make the call again when he sends an init msg.
3533 dev_dbg(&vscsi->dev, "probe hrc %ld, client partition num %d\n",
3534 hrc, vscsi->client_data.partition_number);
3536 tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq,
3537 (unsigned long)vscsi);
3539 init_completion(&vscsi->wait_idle);
3540 init_completion(&vscsi->unconfig);
3542 snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev));
3543 vscsi->work_q = create_workqueue(wq_name);
3544 if (!vscsi->work_q) {
3546 dev_err(&vscsi->dev, "create_workqueue failed\n");
3550 rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi);
3553 dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc);
3557 vscsi->state = WAIT_ENABLED;
3559 dev_set_drvdata(&vdev->dev, vscsi);
3564 destroy_workqueue(vscsi->work_q);
3566 dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
3569 kfree(vscsi->map_buf);
3571 tasklet_kill(&vscsi->work_task);
3572 ibmvscsis_unregister_command_q(vscsi);
3573 ibmvscsis_destroy_command_q(vscsi);
3575 ibmvscsis_freetimer(vscsi);
3577 ibmvscsis_free_cmds(vscsi);
3579 srp_target_free(&vscsi->target);
3581 spin_lock_bh(&ibmvscsis_dev_lock);
3582 list_del(&vscsi->list);
3583 spin_unlock_bh(&ibmvscsis_dev_lock);
3590 static void ibmvscsis_remove(struct vio_dev *vdev)
3592 struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev);
3594 dev_dbg(&vscsi->dev, "remove (%s)\n", dev_name(&vscsi->dma_dev->dev));
3596 spin_lock_bh(&vscsi->intr_lock);
3597 ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0);
3598 vscsi->flags |= CFG_SLEEPING;
3599 spin_unlock_bh(&vscsi->intr_lock);
3600 wait_for_completion(&vscsi->unconfig);
3602 vio_disable_interrupts(vdev);
3603 free_irq(vdev->irq, vscsi);
3604 destroy_workqueue(vscsi->work_q);
3605 dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
3607 kfree(vscsi->map_buf);
3608 tasklet_kill(&vscsi->work_task);
3609 ibmvscsis_destroy_command_q(vscsi);
3610 ibmvscsis_freetimer(vscsi);
3611 ibmvscsis_free_cmds(vscsi);
3612 srp_target_free(&vscsi->target);
3613 spin_lock_bh(&ibmvscsis_dev_lock);
3614 list_del(&vscsi->list);
3615 spin_unlock_bh(&ibmvscsis_dev_lock);
3619 static ssize_t system_id_show(struct device *dev,
3620 struct device_attribute *attr, char *buf)
3622 return snprintf(buf, PAGE_SIZE, "%s\n", system_id);
3625 static ssize_t partition_number_show(struct device *dev,
3626 struct device_attribute *attr, char *buf)
3628 return snprintf(buf, PAGE_SIZE, "%x\n", partition_number);
3631 static ssize_t unit_address_show(struct device *dev,
3632 struct device_attribute *attr, char *buf)
3634 struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev);
3636 return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address);
3639 static int ibmvscsis_get_system_info(void)
3641 struct device_node *rootdn, *vdevdn;
3642 const char *id, *model, *name;
3645 rootdn = of_find_node_by_path("/");
3649 model = of_get_property(rootdn, "model", NULL);
3650 id = of_get_property(rootdn, "system-id", NULL);
3652 snprintf(system_id, sizeof(system_id), "%s-%s", model, id);
3654 name = of_get_property(rootdn, "ibm,partition-name", NULL);
3656 strncpy(partition_name, name, sizeof(partition_name));
3658 num = of_get_property(rootdn, "ibm,partition-no", NULL);
3660 partition_number = of_read_number(num, 1);
3662 of_node_put(rootdn);
3664 vdevdn = of_find_node_by_path("/vdevice");
3668 mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size",
3671 max_vdma_size = *mvds;
3672 of_node_put(vdevdn);
3678 static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg)
3680 struct ibmvscsis_tport *tport =
3681 container_of(se_tpg, struct ibmvscsis_tport, se_tpg);
3683 return tport->tport_name;
3686 static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg)
3688 struct ibmvscsis_tport *tport =
3689 container_of(se_tpg, struct ibmvscsis_tport, se_tpg);
3691 return tport->tport_tpgt;
3694 static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg)
3699 static int ibmvscsis_check_true(struct se_portal_group *se_tpg)
3704 static int ibmvscsis_check_false(struct se_portal_group *se_tpg)
3709 static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg)
3714 static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd)
3716 return target_put_sess_cmd(se_cmd);
3719 static void ibmvscsis_release_cmd(struct se_cmd *se_cmd)
3721 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3723 struct scsi_info *vscsi = cmd->adapter;
3725 spin_lock_bh(&vscsi->intr_lock);
3726 /* Remove from active_q */
3727 list_move_tail(&cmd->list, &vscsi->waiting_rsp);
3728 ibmvscsis_send_messages(vscsi);
3729 spin_unlock_bh(&vscsi->intr_lock);
3732 static u32 ibmvscsis_sess_get_index(struct se_session *se_sess)
3737 static int ibmvscsis_write_pending(struct se_cmd *se_cmd)
3739 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3741 struct scsi_info *vscsi = cmd->adapter;
3742 struct iu_entry *iue = cmd->iue;
3746 * If CLIENT_FAILED OR RESPONSE_Q_DOWN, then just return success
3747 * since LIO can't do anything about it, and we dont want to
3748 * attempt an srp_transfer_data.
3750 if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) {
3751 dev_err(&vscsi->dev, "write_pending failed since: %d\n",
3757 rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma,
3760 dev_err(&vscsi->dev, "srp_transfer_data() failed: %d\n", rc);
3764 * We now tell TCM to add this WRITE CDB directly into the TCM storage
3765 * object execution queue.
3767 target_execute_cmd(se_cmd);
3771 static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl)
3775 static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd)
3780 static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd)
3782 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3784 struct iu_entry *iue = cmd->iue;
3785 struct scsi_info *vscsi = cmd->adapter;
3789 rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1,
3792 dev_err(&vscsi->dev, "srp_transfer_data failed: %d\n", rc);
3793 se_cmd->scsi_sense_length = 18;
3794 memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length);
3795 /* Logical Unit Communication Time-out asc/ascq = 0x0801 */
3796 scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR,
3800 srp_build_response(vscsi, cmd, &len);
3801 cmd->rsp.format = SRP_FORMAT;
3807 static int ibmvscsis_queue_status(struct se_cmd *se_cmd)
3809 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3811 struct scsi_info *vscsi = cmd->adapter;
3814 dev_dbg(&vscsi->dev, "queue_status %p\n", se_cmd);
3816 srp_build_response(vscsi, cmd, &len);
3817 cmd->rsp.format = SRP_FORMAT;
3823 static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd)
3825 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3827 struct scsi_info *vscsi = cmd->adapter;
3828 struct ibmvscsis_cmd *cmd_itr;
3829 struct iu_entry *iue = iue = cmd->iue;
3830 struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
3831 u64 tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
3834 dev_dbg(&vscsi->dev, "queue_tm_rsp %p, status %d\n",
3835 se_cmd, (int)se_cmd->se_tmr_req->response);
3837 if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK &&
3838 cmd->se_cmd.se_tmr_req->response == TMR_TASK_DOES_NOT_EXIST) {
3839 spin_lock_bh(&vscsi->intr_lock);
3840 list_for_each_entry(cmd_itr, &vscsi->active_q, list) {
3841 if (tag_to_abort == cmd_itr->se_cmd.tag) {
3842 cmd_itr->abort_cmd = cmd;
3843 cmd->flags |= DELAY_SEND;
3847 spin_unlock_bh(&vscsi->intr_lock);
3850 srp_build_response(vscsi, cmd, &len);
3851 cmd->rsp.format = SRP_FORMAT;
3855 static void ibmvscsis_aborted_task(struct se_cmd *se_cmd)
3857 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3859 struct scsi_info *vscsi = cmd->adapter;
3861 dev_dbg(&vscsi->dev, "ibmvscsis_aborted_task %p task_tag: %llu\n",
3862 se_cmd, se_cmd->tag);
3865 static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf,
3866 struct config_group *group,
3869 struct ibmvscsis_tport *tport;
3870 struct scsi_info *vscsi;
3872 tport = ibmvscsis_lookup_port(name);
3874 vscsi = container_of(tport, struct scsi_info, tport);
3875 tport->tport_proto_id = SCSI_PROTOCOL_SRP;
3876 dev_dbg(&vscsi->dev, "make_tport(%s), pointer:%p, tport_id:%x\n",
3877 name, tport, tport->tport_proto_id);
3878 return &tport->tport_wwn;
3881 return ERR_PTR(-EINVAL);
3884 static void ibmvscsis_drop_tport(struct se_wwn *wwn)
3886 struct ibmvscsis_tport *tport = container_of(wwn,
3887 struct ibmvscsis_tport,
3889 struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
3891 dev_dbg(&vscsi->dev, "drop_tport(%s)\n",
3892 config_item_name(&tport->tport_wwn.wwn_group.cg_item));
3895 static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn,
3898 struct ibmvscsis_tport *tport =
3899 container_of(wwn, struct ibmvscsis_tport, tport_wwn);
3903 if (strstr(name, "tpgt_") != name)
3904 return ERR_PTR(-EINVAL);
3905 rc = kstrtou16(name + 5, 0, &tpgt);
3908 tport->tport_tpgt = tpgt;
3910 tport->releasing = false;
3912 rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg,
3913 tport->tport_proto_id);
3917 return &tport->se_tpg;
3920 static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg)
3922 struct ibmvscsis_tport *tport = container_of(se_tpg,
3923 struct ibmvscsis_tport,
3926 tport->releasing = true;
3927 tport->enabled = false;
3930 * Release the virtual I_T Nexus for this ibmvscsis TPG
3932 ibmvscsis_drop_nexus(tport);
3934 * Deregister the se_tpg from TCM..
3936 core_tpg_deregister(se_tpg);
3939 static ssize_t ibmvscsis_wwn_version_show(struct config_item *item,
3942 return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION);
3944 CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version);
3946 static struct configfs_attribute *ibmvscsis_wwn_attrs[] = {
3947 &ibmvscsis_wwn_attr_version,
3951 static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item,
3954 struct se_portal_group *se_tpg = to_tpg(item);
3955 struct ibmvscsis_tport *tport = container_of(se_tpg,
3956 struct ibmvscsis_tport,
3959 return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0);
3962 static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item,
3963 const char *page, size_t count)
3965 struct se_portal_group *se_tpg = to_tpg(item);
3966 struct ibmvscsis_tport *tport = container_of(se_tpg,
3967 struct ibmvscsis_tport,
3969 struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
3974 rc = kstrtoul(page, 0, &tmp);
3976 dev_err(&vscsi->dev, "Unable to extract srpt_tpg_store_enable\n");
3980 if ((tmp != 0) && (tmp != 1)) {
3981 dev_err(&vscsi->dev, "Illegal value for srpt_tpg_store_enable\n");
3986 spin_lock_bh(&vscsi->intr_lock);
3987 tport->enabled = true;
3988 lrc = ibmvscsis_enable_change_state(vscsi);
3990 dev_err(&vscsi->dev, "enable_change_state failed, rc %ld state %d\n",
3992 spin_unlock_bh(&vscsi->intr_lock);
3994 spin_lock_bh(&vscsi->intr_lock);
3995 tport->enabled = false;
3996 /* This simulates the server going down */
3997 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
3998 spin_unlock_bh(&vscsi->intr_lock);
4001 dev_dbg(&vscsi->dev, "tpg_enable_store, tmp %ld, state %d\n", tmp,
4006 CONFIGFS_ATTR(ibmvscsis_tpg_, enable);
4008 static struct configfs_attribute *ibmvscsis_tpg_attrs[] = {
4009 &ibmvscsis_tpg_attr_enable,
4013 static const struct target_core_fabric_ops ibmvscsis_ops = {
4014 .module = THIS_MODULE,
4015 .fabric_name = "ibmvscsis",
4016 .max_data_sg_nents = MAX_TXU / PAGE_SIZE,
4017 .tpg_get_wwn = ibmvscsis_get_fabric_wwn,
4018 .tpg_get_tag = ibmvscsis_get_tag,
4019 .tpg_get_default_depth = ibmvscsis_get_default_depth,
4020 .tpg_check_demo_mode = ibmvscsis_check_true,
4021 .tpg_check_demo_mode_cache = ibmvscsis_check_true,
4022 .tpg_check_demo_mode_write_protect = ibmvscsis_check_false,
4023 .tpg_check_prod_mode_write_protect = ibmvscsis_check_false,
4024 .tpg_get_inst_index = ibmvscsis_tpg_get_inst_index,
4025 .check_stop_free = ibmvscsis_check_stop_free,
4026 .release_cmd = ibmvscsis_release_cmd,
4027 .sess_get_index = ibmvscsis_sess_get_index,
4028 .write_pending = ibmvscsis_write_pending,
4029 .set_default_node_attributes = ibmvscsis_set_default_node_attrs,
4030 .get_cmd_state = ibmvscsis_get_cmd_state,
4031 .queue_data_in = ibmvscsis_queue_data_in,
4032 .queue_status = ibmvscsis_queue_status,
4033 .queue_tm_rsp = ibmvscsis_queue_tm_rsp,
4034 .aborted_task = ibmvscsis_aborted_task,
4036 * Setup function pointers for logic in target_core_fabric_configfs.c
4038 .fabric_make_wwn = ibmvscsis_make_tport,
4039 .fabric_drop_wwn = ibmvscsis_drop_tport,
4040 .fabric_make_tpg = ibmvscsis_make_tpg,
4041 .fabric_drop_tpg = ibmvscsis_drop_tpg,
4043 .tfc_wwn_attrs = ibmvscsis_wwn_attrs,
4044 .tfc_tpg_base_attrs = ibmvscsis_tpg_attrs,
4047 static void ibmvscsis_dev_release(struct device *dev) {};
4049 static struct device_attribute dev_attr_system_id =
4050 __ATTR(system_id, S_IRUGO, system_id_show, NULL);
4052 static struct device_attribute dev_attr_partition_number =
4053 __ATTR(partition_number, S_IRUGO, partition_number_show, NULL);
4055 static struct device_attribute dev_attr_unit_address =
4056 __ATTR(unit_address, S_IRUGO, unit_address_show, NULL);
4058 static struct attribute *ibmvscsis_dev_attrs[] = {
4059 &dev_attr_system_id.attr,
4060 &dev_attr_partition_number.attr,
4061 &dev_attr_unit_address.attr,
4063 ATTRIBUTE_GROUPS(ibmvscsis_dev);
4065 static struct class ibmvscsis_class = {
4066 .name = "ibmvscsis",
4067 .dev_release = ibmvscsis_dev_release,
4068 .dev_groups = ibmvscsis_dev_groups,
4071 static const struct vio_device_id ibmvscsis_device_table[] = {
4072 { "v-scsi-host", "IBM,v-scsi-host" },
4075 MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table);
4077 static struct vio_driver ibmvscsis_driver = {
4078 .name = "ibmvscsis",
4079 .id_table = ibmvscsis_device_table,
4080 .probe = ibmvscsis_probe,
4081 .remove = ibmvscsis_remove,
4085 * ibmvscsis_init() - Kernel Module initialization
4087 * Note: vio_register_driver() registers callback functions, and at least one
4088 * of those callback functions calls TCM - Linux IO Target Subsystem, thus
4089 * the SCSI Target template must be registered before vio_register_driver()
4092 static int __init ibmvscsis_init(void)
4096 rc = ibmvscsis_get_system_info();
4098 pr_err("rc %d from get_system_info\n", rc);
4102 rc = class_register(&ibmvscsis_class);
4104 pr_err("failed class register\n");
4108 rc = target_register_template(&ibmvscsis_ops);
4110 pr_err("rc %d from target_register_template\n", rc);
4111 goto unregister_class;
4114 rc = vio_register_driver(&ibmvscsis_driver);
4116 pr_err("rc %d from vio_register_driver\n", rc);
4117 goto unregister_target;
4123 target_unregister_template(&ibmvscsis_ops);
4125 class_unregister(&ibmvscsis_class);
4130 static void __exit ibmvscsis_exit(void)
4132 pr_info("Unregister IBM virtual SCSI host driver\n");
4133 vio_unregister_driver(&ibmvscsis_driver);
4134 target_unregister_template(&ibmvscsis_ops);
4135 class_unregister(&ibmvscsis_class);
4138 MODULE_DESCRIPTION("IBMVSCSIS fabric driver");
4139 MODULE_AUTHOR("Bryant G. Ly and Michael Cyr");
4140 MODULE_LICENSE("GPL");
4141 MODULE_VERSION(IBMVSCSIS_VERSION);
4142 module_init(ibmvscsis_init);
4143 module_exit(ibmvscsis_exit);