1 /*******************************************************************************
2 * IBM Virtual SCSI Target Driver
3 * Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
4 * Santiago Leon (santil@us.ibm.com) IBM Corp.
5 * Linda Xie (lxie@us.ibm.com) IBM Corp.
7 * Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org>
8 * Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org>
10 * Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
11 * Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 ****************************************************************************/
25 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/slab.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/string.h>
33 #include <linux/delay.h>
35 #include <target/target_core_base.h>
36 #include <target/target_core_fabric.h>
38 #include <asm/hvcall.h>
41 #include <scsi/viosrp.h>
43 #include "ibmvscsi_tgt.h"
45 #define IBMVSCSIS_VERSION "v0.2"
47 #define INITIAL_SRP_LIMIT 800
48 #define DEFAULT_MAX_SECTORS 256
49 #define MAX_TXU 1024 * 1024
51 static uint max_vdma_size = MAX_H_COPY_RDMA;
53 static char system_id[SYS_ID_NAME_LEN] = "";
54 static char partition_name[PARTITION_NAMELEN] = "UNKNOWN";
55 static uint partition_number = -1;
57 /* Adapter list and lock to control it */
58 static DEFINE_SPINLOCK(ibmvscsis_dev_lock);
59 static LIST_HEAD(ibmvscsis_dev_list);
61 static long ibmvscsis_parse_command(struct scsi_info *vscsi,
62 struct viosrp_crq *crq);
64 static void ibmvscsis_adapter_idle(struct scsi_info *vscsi);
66 static void ibmvscsis_determine_resid(struct se_cmd *se_cmd,
69 u32 residual_count = se_cmd->residual_count;
74 if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
75 if (se_cmd->data_direction == DMA_TO_DEVICE) {
76 /* residual data from an underflow write */
77 rsp->flags = SRP_RSP_FLAG_DOUNDER;
78 rsp->data_out_res_cnt = cpu_to_be32(residual_count);
79 } else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
80 /* residual data from an underflow read */
81 rsp->flags = SRP_RSP_FLAG_DIUNDER;
82 rsp->data_in_res_cnt = cpu_to_be32(residual_count);
84 } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
85 if (se_cmd->data_direction == DMA_TO_DEVICE) {
86 /* residual data from an overflow write */
87 rsp->flags = SRP_RSP_FLAG_DOOVER;
88 rsp->data_out_res_cnt = cpu_to_be32(residual_count);
89 } else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
90 /* residual data from an overflow read */
91 rsp->flags = SRP_RSP_FLAG_DIOVER;
92 rsp->data_in_res_cnt = cpu_to_be32(residual_count);
98 * connection_broken() - Determine if the connection to the client is good
99 * @vscsi: Pointer to our adapter structure
101 * This function attempts to send a ping MAD to the client. If the call to
102 * queue the request returns H_CLOSED then the connection has been broken
103 * and the function returns TRUE.
105 * EXECUTION ENVIRONMENT:
106 * Interrupt or Process environment
108 static bool connection_broken(struct scsi_info *vscsi)
110 struct viosrp_crq *crq;
111 u64 buffer[2] = { 0, 0 };
115 /* create a PING crq */
116 crq = (struct viosrp_crq *)&buffer;
117 crq->valid = VALID_CMD_RESP_EL;
118 crq->format = MESSAGE_IN_CRQ;
121 h_return_code = h_send_crq(vscsi->dds.unit_id,
122 cpu_to_be64(buffer[MSG_HI]),
123 cpu_to_be64(buffer[MSG_LOW]));
125 dev_dbg(&vscsi->dev, "Connection_broken: rc %ld\n", h_return_code);
127 if (h_return_code == H_CLOSED)
134 * ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue
135 * @vscsi: Pointer to our adapter structure
137 * This function calls h_free_q then frees the interrupt bit etc.
138 * It must release the lock before doing so because of the time it can take
139 * for h_free_crq in PHYP
140 * NOTE: the caller must make sure that state and or flags will prevent
141 * interrupt handler from scheduling work.
142 * NOTE: anyone calling this function may need to set the CRQ_CLOSED flag
143 * we can't do it here, because we don't have the lock
145 * EXECUTION ENVIRONMENT:
148 static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi)
151 long rc = ADAPT_SUCCESS;
155 qrc = h_free_crq(vscsi->dds.unit_id);
158 spin_lock_bh(&vscsi->intr_lock);
159 vscsi->flags &= ~PREP_FOR_SUSPEND_FLAGS;
160 spin_unlock_bh(&vscsi->intr_lock);
165 dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n",
171 case H_LONG_BUSY_ORDER_1_MSEC:
172 /* msleep not good for small values */
173 usleep_range(1000, 2000);
176 case H_LONG_BUSY_ORDER_10_MSEC:
177 usleep_range(10000, 20000);
180 case H_LONG_BUSY_ORDER_100_MSEC:
184 case H_LONG_BUSY_ORDER_1_SEC:
188 case H_LONG_BUSY_ORDER_10_SEC:
192 case H_LONG_BUSY_ORDER_100_SEC:
197 dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n",
204 * dont wait more then 300 seconds
205 * ticks are in milliseconds more or less
207 if (ticks > 300000 && qrc != H_SUCCESS) {
209 dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n");
211 } while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS);
213 dev_dbg(&vscsi->dev, "Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc);
219 * ibmvscsis_delete_client_info() - Helper function to Delete Client Info
220 * @vscsi: Pointer to our adapter structure
221 * @client_closed: True if client closed its queue
223 * Deletes information specific to the client when the client goes away
225 * EXECUTION ENVIRONMENT:
226 * Interrupt or Process
228 static void ibmvscsis_delete_client_info(struct scsi_info *vscsi,
231 vscsi->client_cap = 0;
234 * Some things we don't want to clear if we're closing the queue,
235 * because some clients don't resend the host handshake when they
236 * get a transport event.
239 vscsi->client_data.os_type = 0;
243 * ibmvscsis_free_command_q() - Free Command Queue
244 * @vscsi: Pointer to our adapter structure
246 * This function calls unregister_command_q, then clears interrupts and
247 * any pending interrupt acknowledgments associated with the command q.
248 * It also clears memory if there is no error.
250 * PHYP did not meet the PAPR architecture so that we must give up the
251 * lock. This causes a timing hole regarding state change. To close the
252 * hole this routine does accounting on any change that occurred during
253 * the time the lock is not held.
254 * NOTE: must give up and then acquire the interrupt lock, the caller must
255 * make sure that state and or flags will prevent interrupt handler from
258 * EXECUTION ENVIRONMENT:
259 * Process level, interrupt lock is held
261 static long ibmvscsis_free_command_q(struct scsi_info *vscsi)
264 u32 flags_under_lock;
265 u16 state_under_lock;
266 long rc = ADAPT_SUCCESS;
268 if (!(vscsi->flags & CRQ_CLOSED)) {
269 vio_disable_interrupts(vscsi->dma_dev);
271 state_under_lock = vscsi->new_state;
272 flags_under_lock = vscsi->flags;
273 vscsi->phyp_acr_state = 0;
274 vscsi->phyp_acr_flags = 0;
276 spin_unlock_bh(&vscsi->intr_lock);
277 rc = ibmvscsis_unregister_command_q(vscsi);
278 spin_lock_bh(&vscsi->intr_lock);
280 if (state_under_lock != vscsi->new_state)
281 vscsi->phyp_acr_state = vscsi->new_state;
283 vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags);
285 if (rc == ADAPT_SUCCESS) {
286 bytes = vscsi->cmd_q.size * PAGE_SIZE;
287 memset(vscsi->cmd_q.base_addr, 0, bytes);
288 vscsi->cmd_q.index = 0;
289 vscsi->flags |= CRQ_CLOSED;
291 ibmvscsis_delete_client_info(vscsi, false);
294 dev_dbg(&vscsi->dev, "free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
295 vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
296 vscsi->phyp_acr_state);
302 * ibmvscsis_cmd_q_dequeue() - Get valid Command element
303 * @mask: Mask to use in case index wraps
304 * @current_index: Current index into command queue
305 * @base_addr: Pointer to start of command queue
307 * Returns a pointer to a valid command element or NULL, if the command
310 * EXECUTION ENVIRONMENT:
311 * Interrupt environment, interrupt lock held
313 static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask,
315 struct viosrp_crq *base_addr)
317 struct viosrp_crq *ptr;
319 ptr = base_addr + *current_index;
322 *current_index = (*current_index + 1) & mask;
332 * ibmvscsis_send_init_message() - send initialize message to the client
333 * @vscsi: Pointer to our adapter structure
334 * @format: Which Init Message format to send
336 * EXECUTION ENVIRONMENT:
337 * Interrupt environment interrupt lock held
339 static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format)
341 struct viosrp_crq *crq;
342 u64 buffer[2] = { 0, 0 };
345 crq = (struct viosrp_crq *)&buffer;
346 crq->valid = VALID_INIT_MSG;
347 crq->format = format;
348 rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
349 cpu_to_be64(buffer[MSG_LOW]));
355 * ibmvscsis_check_init_msg() - Check init message valid
356 * @vscsi: Pointer to our adapter structure
357 * @format: Pointer to return format of Init Message, if any.
358 * Set to UNUSED_FORMAT if no Init Message in queue.
360 * Checks if an initialize message was queued by the initiatior
361 * after the queue was created and before the interrupt was enabled.
363 * EXECUTION ENVIRONMENT:
364 * Process level only, interrupt lock held
366 static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format)
368 struct viosrp_crq *crq;
369 long rc = ADAPT_SUCCESS;
371 crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index,
372 vscsi->cmd_q.base_addr);
374 *format = (uint)UNUSED_FORMAT;
375 } else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) {
376 *format = (uint)INIT_MSG;
377 crq->valid = INVALIDATE_CMD_RESP_EL;
381 * the caller has ensured no initialize message was
382 * sent after the queue was
383 * created so there should be no other message on the queue.
385 crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask,
387 vscsi->cmd_q.base_addr);
389 *format = (uint)(crq->format);
391 crq->valid = INVALIDATE_CMD_RESP_EL;
395 *format = (uint)(crq->format);
397 crq->valid = INVALIDATE_CMD_RESP_EL;
405 * ibmvscsis_disconnect() - Helper function to disconnect
406 * @work: Pointer to work_struct, gives access to our adapter structure
408 * An error has occurred or the driver received a Transport event,
409 * and the driver is requesting that the command queue be de-registered
410 * in a safe manner. If there is no outstanding I/O then we can stop the
411 * queue. If we are restarting the queue it will be reflected in the
412 * the state of the adapter.
414 * EXECUTION ENVIRONMENT:
415 * Process environment
417 static void ibmvscsis_disconnect(struct work_struct *work)
419 struct scsi_info *vscsi = container_of(work, struct scsi_info,
422 bool wait_idle = false;
424 spin_lock_bh(&vscsi->intr_lock);
425 new_state = vscsi->new_state;
426 vscsi->new_state = 0;
428 vscsi->flags |= DISCONNECT_SCHEDULED;
429 vscsi->flags &= ~SCHEDULE_DISCONNECT;
431 dev_dbg(&vscsi->dev, "disconnect: flags 0x%x, state 0x%hx\n",
432 vscsi->flags, vscsi->state);
435 * check which state we are in and see if we
436 * should transitition to the new state
438 switch (vscsi->state) {
439 /* Should never be called while in this state. */
442 * Can never transition from this state;
443 * igonore errors and logout.
448 /* can transition from this state to UNCONFIGURING */
450 if (new_state == UNCONFIGURING)
451 vscsi->state = new_state;
455 * Can transition from this state to to unconfiguring
458 case ERR_DISCONNECT_RECONNECT:
462 vscsi->state = new_state;
472 /* can transition from this state to UNCONFIGURING */
473 case ERR_DISCONNECTED:
474 if (new_state == UNCONFIGURING)
475 vscsi->state = new_state;
481 vscsi->state = new_state;
482 vscsi->flags |= RESPONSE_Q_DOWN;
483 vscsi->flags &= ~(SCHEDULE_DISCONNECT |
484 DISCONNECT_SCHEDULED);
486 if (vscsi->flags & CFG_SLEEPING) {
487 vscsi->flags &= ~CFG_SLEEPING;
488 complete(&vscsi->unconfig);
492 /* should never happen */
494 case ERR_DISCONNECT_RECONNECT:
496 dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n",
505 vscsi->flags |= RESPONSE_Q_DOWN;
506 vscsi->state = new_state;
507 vscsi->flags &= ~(SCHEDULE_DISCONNECT |
508 DISCONNECT_SCHEDULED);
509 ibmvscsis_free_command_q(vscsi);
512 case ERR_DISCONNECT_RECONNECT:
513 vscsi->state = new_state;
519 * Initiator has not done a successful srp login
520 * or has done a successful srp logout ( adapter was not
521 * busy). In the first case there can be responses queued
522 * waiting for space on the initiators response queue (MAD)
523 * The second case the adapter is idle. Assume the worse case,
524 * i.e. the second case.
526 case WAIT_CONNECTION:
530 vscsi->state = new_state;
533 /* can transition from this state to UNCONFIGURING */
535 if (new_state == UNCONFIGURING)
536 vscsi->state = new_state;
543 dev_dbg(&vscsi->dev, "disconnect start wait, active %d, sched %d\n",
544 (int)list_empty(&vscsi->active_q),
545 (int)list_empty(&vscsi->schedule_q));
546 if (!list_empty(&vscsi->active_q) ||
547 !list_empty(&vscsi->schedule_q)) {
548 vscsi->flags |= WAIT_FOR_IDLE;
549 dev_dbg(&vscsi->dev, "disconnect flags 0x%x\n",
552 * This routine is can not be called with the interrupt
555 spin_unlock_bh(&vscsi->intr_lock);
556 wait_for_completion(&vscsi->wait_idle);
557 spin_lock_bh(&vscsi->intr_lock);
559 dev_dbg(&vscsi->dev, "disconnect stop wait\n");
561 ibmvscsis_adapter_idle(vscsi);
564 spin_unlock_bh(&vscsi->intr_lock);
568 * ibmvscsis_post_disconnect() - Schedule the disconnect
569 * @vscsi: Pointer to our adapter structure
570 * @new_state: State to move to after disconnecting
571 * @flag_bits: Flags to turn on in adapter structure
573 * If it's already been scheduled, then see if we need to "upgrade"
574 * the new state (if the one passed in is more "severe" than the
578 * interrupt lock is held
580 static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state,
585 /* check the validity of the new state */
589 case ERR_DISCONNECT_RECONNECT:
594 dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n",
599 vscsi->flags |= flag_bits;
601 dev_dbg(&vscsi->dev, "post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n",
602 new_state, flag_bits, vscsi->flags, vscsi->state);
604 if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) {
605 vscsi->flags |= SCHEDULE_DISCONNECT;
606 vscsi->new_state = new_state;
608 INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect);
609 (void)queue_work(vscsi->work_q, &vscsi->proc_work);
611 if (vscsi->new_state)
612 state = vscsi->new_state;
614 state = vscsi->state;
621 case ERR_DISCONNECTED:
624 if (new_state == UNCONFIGURING)
625 vscsi->new_state = new_state;
628 case ERR_DISCONNECT_RECONNECT:
632 vscsi->new_state = new_state;
641 case WAIT_CONNECTION:
644 vscsi->new_state = new_state;
652 dev_dbg(&vscsi->dev, "Leaving post_disconnect: flags 0x%x, new_state 0x%x\n",
653 vscsi->flags, vscsi->new_state);
657 * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message
658 * @vscsi: Pointer to our adapter structure
660 * Must be called with interrupt lock held.
662 static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi)
664 long rc = ADAPT_SUCCESS;
666 switch (vscsi->state) {
669 case ERR_DISCONNECT_RECONNECT:
670 case ERR_DISCONNECTED:
676 case WAIT_CONNECTION:
677 vscsi->state = CONNECTED;
686 dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n",
688 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
696 * ibmvscsis_handle_init_msg() - Respond to an Init Message
697 * @vscsi: Pointer to our adapter structure
699 * Must be called with interrupt lock held.
701 static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi)
703 long rc = ADAPT_SUCCESS;
705 switch (vscsi->state) {
706 case WAIT_CONNECTION:
707 rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG);
710 vscsi->state = CONNECTED;
714 dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
716 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
720 dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
723 ibmvscsis_post_disconnect(vscsi,
724 ERR_DISCONNECT_RECONNECT, 0);
728 dev_warn(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
748 case ERR_DISCONNECT_RECONNECT:
749 case ERR_DISCONNECTED:
752 dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n",
754 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
762 * ibmvscsis_init_msg() - Respond to an init message
763 * @vscsi: Pointer to our adapter structure
764 * @crq: Pointer to CRQ element containing the Init Message
766 * EXECUTION ENVIRONMENT:
767 * Interrupt, interrupt lock held
769 static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq)
771 long rc = ADAPT_SUCCESS;
773 dev_dbg(&vscsi->dev, "init_msg: state 0x%hx\n", vscsi->state);
775 rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
776 (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
778 if (rc == H_SUCCESS) {
779 vscsi->client_data.partition_number =
780 be64_to_cpu(*(u64 *)vscsi->map_buf);
781 dev_dbg(&vscsi->dev, "init_msg, part num %d\n",
782 vscsi->client_data.partition_number);
784 dev_dbg(&vscsi->dev, "init_msg h_vioctl rc %ld\n", rc);
788 if (crq->format == INIT_MSG) {
789 rc = ibmvscsis_handle_init_msg(vscsi);
790 } else if (crq->format == INIT_COMPLETE_MSG) {
791 rc = ibmvscsis_handle_init_compl_msg(vscsi);
794 dev_err(&vscsi->dev, "init_msg: invalid format %d\n",
796 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
803 * ibmvscsis_establish_new_q() - Establish new CRQ queue
804 * @vscsi: Pointer to our adapter structure
806 * Must be called with interrupt lock held.
808 static long ibmvscsis_establish_new_q(struct scsi_info *vscsi)
810 long rc = ADAPT_SUCCESS;
813 rc = h_vioctl(vscsi->dds.unit_id, H_ENABLE_PREPARE_FOR_SUSPEND, 30000,
816 vscsi->flags |= PREP_FOR_SUSPEND_ENABLED;
817 else if (rc != H_NOT_FOUND)
818 dev_err(&vscsi->dev, "Error from Enable Prepare for Suspend: %ld\n",
821 vscsi->flags &= PRESERVE_FLAG_FIELDS;
822 vscsi->rsp_q_timer.timer_pops = 0;
826 rc = vio_enable_interrupts(vscsi->dma_dev);
828 dev_warn(&vscsi->dev, "establish_new_q: failed to enable interrupts, rc %ld\n",
833 rc = ibmvscsis_check_init_msg(vscsi, &format);
835 dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n",
840 if (format == UNUSED_FORMAT) {
841 rc = ibmvscsis_send_init_message(vscsi, INIT_MSG);
854 vscsi->state = UNDEFINED;
858 } else if (format == INIT_MSG) {
859 rc = ibmvscsis_handle_init_msg(vscsi);
866 * ibmvscsis_reset_queue() - Reset CRQ Queue
867 * @vscsi: Pointer to our adapter structure
869 * This function calls h_free_q and then calls h_reg_q and does all
870 * of the bookkeeping to get us back to where we can communicate.
872 * Actually, we don't always call h_free_crq. A problem was discovered
873 * where one partition would close and reopen his queue, which would
874 * cause his partner to get a transport event, which would cause him to
875 * close and reopen his queue, which would cause the original partition
876 * to get a transport event, etc., etc. To prevent this, we don't
877 * actually close our queue if the client initiated the reset, (i.e.
878 * either we got a transport event or we have detected that the client's
881 * EXECUTION ENVIRONMENT:
882 * Process environment, called with interrupt lock held
884 static void ibmvscsis_reset_queue(struct scsi_info *vscsi)
887 long rc = ADAPT_SUCCESS;
889 dev_dbg(&vscsi->dev, "reset_queue: flags 0x%x\n", vscsi->flags);
891 /* don't reset, the client did it for us */
892 if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) {
893 vscsi->flags &= PRESERVE_FLAG_FIELDS;
894 vscsi->rsp_q_timer.timer_pops = 0;
897 vscsi->state = WAIT_CONNECTION;
898 vio_enable_interrupts(vscsi->dma_dev);
900 rc = ibmvscsis_free_command_q(vscsi);
901 if (rc == ADAPT_SUCCESS) {
902 vscsi->state = WAIT_CONNECTION;
904 bytes = vscsi->cmd_q.size * PAGE_SIZE;
905 rc = h_reg_crq(vscsi->dds.unit_id,
906 vscsi->cmd_q.crq_token, bytes);
907 if (rc == H_CLOSED || rc == H_SUCCESS) {
908 rc = ibmvscsis_establish_new_q(vscsi);
911 if (rc != ADAPT_SUCCESS) {
912 dev_dbg(&vscsi->dev, "reset_queue: reg_crq rc %ld\n",
915 vscsi->state = ERR_DISCONNECTED;
916 vscsi->flags |= RESPONSE_Q_DOWN;
917 ibmvscsis_free_command_q(vscsi);
920 vscsi->state = ERR_DISCONNECTED;
921 vscsi->flags |= RESPONSE_Q_DOWN;
927 * ibmvscsis_free_cmd_resources() - Free command resources
928 * @vscsi: Pointer to our adapter structure
929 * @cmd: Command which is not longer in use
931 * Must be called with interrupt lock held.
933 static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi,
934 struct ibmvscsis_cmd *cmd)
936 struct iu_entry *iue = cmd->iue;
939 case TASK_MANAGEMENT:
942 * When the queue goes down this value is cleared, so it
943 * cannot be cleared in this general purpose function.
949 vscsi->flags &= ~PROCESSING_MAD;
954 dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n",
960 list_add_tail(&cmd->list, &vscsi->free_cmd);
963 if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) &&
964 list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) {
965 vscsi->flags &= ~WAIT_FOR_IDLE;
966 complete(&vscsi->wait_idle);
971 * ibmvscsis_ready_for_suspend() - Helper function to call VIOCTL
972 * @vscsi: Pointer to our adapter structure
973 * @idle: Indicates whether we were called from adapter_idle. This
974 * is important to know if we need to do a disconnect, since if
975 * we're called from adapter_idle, we're still processing the
976 * current disconnect, so we can't just call post_disconnect.
978 * This function is called when the adapter is idle when phyp has sent
979 * us a Prepare for Suspend Transport Event.
981 * EXECUTION ENVIRONMENT:
982 * Process or interrupt environment called with interrupt lock held
984 static long ibmvscsis_ready_for_suspend(struct scsi_info *vscsi, bool idle)
987 struct viosrp_crq *crq;
989 /* See if there is a Resume event in the queue */
990 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
992 dev_dbg(&vscsi->dev, "ready_suspend: flags 0x%x, state 0x%hx crq_valid:%x\n",
993 vscsi->flags, vscsi->state, (int)crq->valid);
995 if (!(vscsi->flags & PREP_FOR_SUSPEND_ABORTED) && !(crq->valid)) {
996 rc = h_vioctl(vscsi->dds.unit_id, H_READY_FOR_SUSPEND, 0, 0, 0,
999 dev_err(&vscsi->dev, "Ready for Suspend Vioctl failed: %ld\n",
1003 } else if (((vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE) &&
1004 (vscsi->flags & PREP_FOR_SUSPEND_ABORTED)) ||
1005 ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
1006 (crq->format != RESUME_FROM_SUSP)))) {
1008 vscsi->state = ERR_DISCONNECT_RECONNECT;
1009 ibmvscsis_reset_queue(vscsi);
1011 } else if (vscsi->state == CONNECTED) {
1012 ibmvscsis_post_disconnect(vscsi,
1013 ERR_DISCONNECT_RECONNECT, 0);
1016 vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1018 if ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
1019 (crq->format != RESUME_FROM_SUSP)))
1020 dev_err(&vscsi->dev, "Invalid element in CRQ after Prepare for Suspend");
1023 vscsi->flags &= ~(PREP_FOR_SUSPEND_PENDING | PREP_FOR_SUSPEND_ABORTED);
1029 * ibmvscsis_trans_event() - Handle a Transport Event
1030 * @vscsi: Pointer to our adapter structure
1031 * @crq: Pointer to CRQ entry containing the Transport Event
1033 * Do the logic to close the I_T nexus. This function may not
1034 * behave to specification.
1036 * EXECUTION ENVIRONMENT:
1037 * Interrupt, interrupt lock held
1039 static long ibmvscsis_trans_event(struct scsi_info *vscsi,
1040 struct viosrp_crq *crq)
1042 long rc = ADAPT_SUCCESS;
1044 dev_dbg(&vscsi->dev, "trans_event: format %d, flags 0x%x, state 0x%hx\n",
1045 (int)crq->format, vscsi->flags, vscsi->state);
1047 switch (crq->format) {
1049 case PARTNER_FAILED:
1050 case PARTNER_DEREGISTER:
1051 ibmvscsis_delete_client_info(vscsi, true);
1052 if (crq->format == MIGRATED)
1053 vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1054 switch (vscsi->state) {
1056 case ERR_DISCONNECTED:
1061 vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
1067 case WAIT_CONNECTION:
1071 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
1076 case SRP_PROCESSING:
1077 if ((vscsi->debit > 0) ||
1078 !list_empty(&vscsi->schedule_q) ||
1079 !list_empty(&vscsi->waiting_rsp) ||
1080 !list_empty(&vscsi->active_q)) {
1081 dev_dbg(&vscsi->dev, "debit %d, sched %d, wait %d, active %d\n",
1083 (int)list_empty(&vscsi->schedule_q),
1084 (int)list_empty(&vscsi->waiting_rsp),
1085 (int)list_empty(&vscsi->active_q));
1086 dev_warn(&vscsi->dev, "connection lost with outstanding work\n");
1088 dev_dbg(&vscsi->dev, "trans_event: SRP Processing, but no outstanding work\n");
1091 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
1096 case ERR_DISCONNECT:
1097 case ERR_DISCONNECT_RECONNECT:
1099 vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
1104 case PREPARE_FOR_SUSPEND:
1105 dev_dbg(&vscsi->dev, "Prep for Suspend, crq status = 0x%x\n",
1107 switch (vscsi->state) {
1108 case ERR_DISCONNECTED:
1109 case WAIT_CONNECTION:
1111 ibmvscsis_ready_for_suspend(vscsi, false);
1113 case SRP_PROCESSING:
1114 vscsi->resume_state = vscsi->state;
1115 vscsi->flags |= PREP_FOR_SUSPEND_PENDING;
1116 if (crq->status == CRQ_ENTRY_OVERWRITTEN)
1117 vscsi->flags |= PREP_FOR_SUSPEND_OVERWRITE;
1118 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
1124 case ERR_DISCONNECT:
1125 case ERR_DISCONNECT_RECONNECT:
1127 dev_err(&vscsi->dev, "Invalid state for Prepare for Suspend Trans Event: 0x%x\n",
1133 case RESUME_FROM_SUSP:
1134 dev_dbg(&vscsi->dev, "Resume from Suspend, crq status = 0x%x\n",
1136 if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
1137 vscsi->flags |= PREP_FOR_SUSPEND_ABORTED;
1139 if ((crq->status == CRQ_ENTRY_OVERWRITTEN) ||
1140 (vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE)) {
1141 ibmvscsis_post_disconnect(vscsi,
1142 ERR_DISCONNECT_RECONNECT,
1144 vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1151 dev_err(&vscsi->dev, "trans_event: invalid format %d\n",
1153 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT,
1158 rc = vscsi->flags & SCHEDULE_DISCONNECT;
1160 dev_dbg(&vscsi->dev, "Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n",
1161 vscsi->flags, vscsi->state, rc);
1167 * ibmvscsis_poll_cmd_q() - Poll Command Queue
1168 * @vscsi: Pointer to our adapter structure
1170 * Called to handle command elements that may have arrived while
1171 * interrupts were disabled.
1173 * EXECUTION ENVIRONMENT:
1174 * intr_lock must be held
1176 static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi)
1178 struct viosrp_crq *crq;
1183 dev_dbg(&vscsi->dev, "poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n",
1184 vscsi->flags, vscsi->state, vscsi->cmd_q.index);
1186 rc = vscsi->flags & SCHEDULE_DISCONNECT;
1187 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
1193 vscsi->cmd_q.index =
1194 (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;
1197 rc = ibmvscsis_parse_command(vscsi, crq);
1199 if ((uint)crq->valid == VALID_TRANS_EVENT) {
1201 * must service the transport layer events even
1202 * in an error state, dont break out until all
1203 * the consecutive transport events have been
1206 rc = ibmvscsis_trans_event(vscsi, crq);
1207 } else if (vscsi->flags & TRANS_EVENT) {
1209 * if a tranport event has occurred leave
1210 * everything but transport events on the queue
1212 dev_dbg(&vscsi->dev, "poll_cmd_q, ignoring\n");
1215 * need to decrement the queue index so we can
1216 * look at the elment again
1218 if (vscsi->cmd_q.index)
1219 vscsi->cmd_q.index -= 1;
1222 * index is at 0 it just wrapped.
1223 * have it index last element in q
1225 vscsi->cmd_q.index = vscsi->cmd_q.mask;
1230 crq->valid = INVALIDATE_CMD_RESP_EL;
1232 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
1239 vio_enable_interrupts(vscsi->dma_dev);
1241 dev_dbg(&vscsi->dev, "poll_cmd_q, reenabling interrupts\n");
1249 dev_dbg(&vscsi->dev, "Leaving poll_cmd_q: rc %ld\n", rc);
1253 * ibmvscsis_free_cmd_qs() - Free elements in queue
1254 * @vscsi: Pointer to our adapter structure
1256 * Free all of the elements on all queues that are waiting for
1260 * Called with interrupt lock held
1262 static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi)
1264 struct ibmvscsis_cmd *cmd, *nxt;
1266 dev_dbg(&vscsi->dev, "free_cmd_qs: waiting_rsp empty %d, timer starter %d\n",
1267 (int)list_empty(&vscsi->waiting_rsp),
1268 vscsi->rsp_q_timer.started);
1270 list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) {
1271 list_del(&cmd->list);
1272 ibmvscsis_free_cmd_resources(vscsi, cmd);
1277 * ibmvscsis_get_free_cmd() - Get free command from list
1278 * @vscsi: Pointer to our adapter structure
1280 * Must be called with interrupt lock held.
1282 static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi)
1284 struct ibmvscsis_cmd *cmd = NULL;
1285 struct iu_entry *iue;
1287 iue = srp_iu_get(&vscsi->target);
1289 cmd = list_first_entry_or_null(&vscsi->free_cmd,
1290 struct ibmvscsis_cmd, list);
1293 cmd->abort_cmd = NULL;
1294 cmd->flags &= ~(DELAY_SEND);
1295 list_del(&cmd->list);
1297 cmd->type = UNSET_TYPE;
1298 memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd));
1308 * ibmvscsis_adapter_idle() - Helper function to handle idle adapter
1309 * @vscsi: Pointer to our adapter structure
1311 * This function is called when the adapter is idle when the driver
1312 * is attempting to clear an error condition.
1313 * The adapter is considered busy if any of its cmd queues
1314 * are non-empty. This function can be invoked
1315 * from the off level disconnect function.
1317 * EXECUTION ENVIRONMENT:
1318 * Process environment called with interrupt lock held
1320 static void ibmvscsis_adapter_idle(struct scsi_info *vscsi)
1322 int free_qs = false;
1325 dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx\n",
1326 vscsi->flags, vscsi->state);
1328 /* Only need to free qs if we're disconnecting from client */
1329 if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT)
1332 switch (vscsi->state) {
1334 ibmvscsis_free_command_q(vscsi);
1337 if (vscsi->flags & CFG_SLEEPING) {
1338 vscsi->flags &= ~CFG_SLEEPING;
1339 complete(&vscsi->unconfig);
1342 case ERR_DISCONNECT_RECONNECT:
1343 ibmvscsis_reset_queue(vscsi);
1344 dev_dbg(&vscsi->dev, "adapter_idle, disc_rec: flags 0x%x\n",
1348 case ERR_DISCONNECT:
1349 ibmvscsis_free_command_q(vscsi);
1350 vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED);
1351 vscsi->flags |= RESPONSE_Q_DOWN;
1352 if (vscsi->tport.enabled)
1353 vscsi->state = ERR_DISCONNECTED;
1355 vscsi->state = WAIT_ENABLED;
1356 dev_dbg(&vscsi->dev, "adapter_idle, disc: flags 0x%x, state 0x%hx\n",
1357 vscsi->flags, vscsi->state);
1361 vscsi->rsp_q_timer.timer_pops = 0;
1364 if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
1365 vscsi->state = vscsi->resume_state;
1366 vscsi->resume_state = 0;
1367 rc = ibmvscsis_ready_for_suspend(vscsi, true);
1368 vscsi->flags &= ~DISCONNECT_SCHEDULED;
1371 } else if (vscsi->flags & TRANS_EVENT) {
1372 vscsi->state = WAIT_CONNECTION;
1373 vscsi->flags &= PRESERVE_FLAG_FIELDS;
1375 vscsi->state = CONNECTED;
1376 vscsi->flags &= ~DISCONNECT_SCHEDULED;
1379 dev_dbg(&vscsi->dev, "adapter_idle, wait: flags 0x%x, state 0x%hx\n",
1380 vscsi->flags, vscsi->state);
1381 ibmvscsis_poll_cmd_q(vscsi);
1384 case ERR_DISCONNECTED:
1385 vscsi->flags &= ~DISCONNECT_SCHEDULED;
1386 dev_dbg(&vscsi->dev, "adapter_idle, disconnected: flags 0x%x, state 0x%hx\n",
1387 vscsi->flags, vscsi->state);
1391 dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n",
1397 ibmvscsis_free_cmd_qs(vscsi);
1400 * There is a timing window where we could lose a disconnect request.
1401 * The known path to this window occurs during the DISCONNECT_RECONNECT
1402 * case above: reset_queue calls free_command_q, which will release the
1403 * interrupt lock. During that time, a new post_disconnect call can be
1404 * made with a "more severe" state (DISCONNECT or UNCONFIGURING).
1405 * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect
1406 * will only set the new_state. Now free_command_q reacquires the intr
1407 * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_
1408 * FIELDS), and the disconnect is lost. This is particularly bad when
1409 * the new disconnect was for UNCONFIGURING, since the unconfigure hangs
1411 * Fix is that free command queue sets acr state and acr flags if there
1412 * is a change under the lock
1413 * note free command queue writes to this state it clears it
1414 * before releasing the lock, different drivers call the free command
1415 * queue different times so dont initialize above
1417 if (vscsi->phyp_acr_state != 0) {
1419 * set any bits in flags that may have been cleared by
1420 * a call to free command queue in switch statement
1423 vscsi->flags |= vscsi->phyp_acr_flags;
1424 ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0);
1425 vscsi->phyp_acr_state = 0;
1426 vscsi->phyp_acr_flags = 0;
1428 dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
1429 vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
1430 vscsi->phyp_acr_state);
1433 dev_dbg(&vscsi->dev, "Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n",
1434 vscsi->flags, vscsi->state, vscsi->new_state);
1438 * ibmvscsis_copy_crq_packet() - Copy CRQ Packet
1439 * @vscsi: Pointer to our adapter structure
1440 * @cmd: Pointer to command element to use to process the request
1441 * @crq: Pointer to CRQ entry containing the request
1443 * Copy the srp information unit from the hosted
1444 * partition using remote dma
1446 * EXECUTION ENVIRONMENT:
1447 * Interrupt, interrupt lock held
1449 static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi,
1450 struct ibmvscsis_cmd *cmd,
1451 struct viosrp_crq *crq)
1453 struct iu_entry *iue = cmd->iue;
1457 len = be16_to_cpu(crq->IU_length);
1458 if ((len > SRP_MAX_IU_LEN) || (len == 0)) {
1459 dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len);
1460 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
1461 return SRP_VIOLATION;
1464 rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn,
1465 be64_to_cpu(crq->IU_data_ptr),
1466 vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma);
1470 cmd->init_time = mftb();
1471 iue->remote_token = crq->IU_data_ptr;
1473 dev_dbg(&vscsi->dev, "copy_crq: ioba 0x%llx, init_time 0x%llx\n",
1474 be64_to_cpu(crq->IU_data_ptr), cmd->init_time);
1477 if (connection_broken(vscsi))
1478 ibmvscsis_post_disconnect(vscsi,
1479 ERR_DISCONNECT_RECONNECT,
1483 ibmvscsis_post_disconnect(vscsi,
1484 ERR_DISCONNECT_RECONNECT, 0);
1486 dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
1492 dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
1494 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
1502 * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram
1503 * @vscsi: Pointer to our adapter structure
1504 * @iue: Information Unit containing the Adapter Info MAD request
1506 * EXECUTION ENVIRONMENT:
1507 * Interrupt adapter lock is held
1509 static long ibmvscsis_adapter_info(struct scsi_info *vscsi,
1510 struct iu_entry *iue)
1512 struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info;
1513 struct mad_adapter_info_data *info;
1518 mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1520 if (be16_to_cpu(mad->common.length) > sizeof(*info)) {
1521 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1525 info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token,
1528 dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
1530 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1534 /* Get remote info */
1535 rc = h_copy_rdma(be16_to_cpu(mad->common.length),
1536 vscsi->dds.window[REMOTE].liobn,
1537 be64_to_cpu(mad->buffer),
1538 vscsi->dds.window[LOCAL].liobn, token);
1540 if (rc != H_SUCCESS) {
1541 if (rc == H_PERMISSION) {
1542 if (connection_broken(vscsi))
1543 flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
1545 dev_warn(&vscsi->dev, "adapter_info: h_copy_rdma from client failed, rc %ld\n",
1547 dev_dbg(&vscsi->dev, "adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n",
1548 be64_to_cpu(mad->buffer), vscsi->flags, flag_bits);
1549 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
1555 * Copy client info, but ignore partition number, which we
1556 * already got from phyp - unless we failed to get it from
1557 * phyp (e.g. if we're running on a p5 system).
1559 if (vscsi->client_data.partition_number == 0)
1560 vscsi->client_data.partition_number =
1561 be32_to_cpu(info->partition_number);
1562 strncpy(vscsi->client_data.srp_version, info->srp_version,
1563 sizeof(vscsi->client_data.srp_version));
1564 strncpy(vscsi->client_data.partition_name, info->partition_name,
1565 sizeof(vscsi->client_data.partition_name));
1566 vscsi->client_data.mad_version = be32_to_cpu(info->mad_version);
1567 vscsi->client_data.os_type = be32_to_cpu(info->os_type);
1570 strncpy(info->srp_version, SRP_VERSION,
1571 sizeof(info->srp_version));
1572 strncpy(info->partition_name, vscsi->dds.partition_name,
1573 sizeof(info->partition_name));
1574 info->partition_number = cpu_to_be32(vscsi->dds.partition_num);
1575 info->mad_version = cpu_to_be32(MAD_VERSION_1);
1576 info->os_type = cpu_to_be32(LINUX);
1577 memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu));
1578 info->port_max_txu[0] = cpu_to_be32(MAX_TXU);
1581 rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn,
1582 token, vscsi->dds.window[REMOTE].liobn,
1583 be64_to_cpu(mad->buffer));
1591 if (connection_broken(vscsi))
1592 flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
1594 dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n",
1596 ibmvscsis_post_disconnect(vscsi,
1597 ERR_DISCONNECT_RECONNECT,
1603 dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token);
1604 dev_dbg(&vscsi->dev, "Leaving adapter_info, rc %ld\n", rc);
1610 * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram
1611 * @vscsi: Pointer to our adapter structure
1612 * @iue: Information Unit containing the Capabilities MAD request
1614 * NOTE: if you return an error from this routine you must be
1615 * disconnecting or you will cause a hang
1617 * EXECUTION ENVIRONMENT:
1618 * Interrupt called with adapter lock held
1620 static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue)
1622 struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities;
1623 struct capabilities *cap;
1624 struct mad_capability_common *common;
1626 u16 olen, len, status, min_len, cap_len;
1631 olen = be16_to_cpu(mad->common.length);
1633 * struct capabilities hardcodes a couple capabilities after the
1634 * header, but the capabilities can actually be in any order.
1636 min_len = offsetof(struct capabilities, migration);
1637 if ((olen < min_len) || (olen > PAGE_SIZE)) {
1638 dev_warn(&vscsi->dev, "cap_mad: invalid len %d\n", olen);
1639 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1643 cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token,
1646 dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
1648 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1651 rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn,
1652 be64_to_cpu(mad->buffer),
1653 vscsi->dds.window[LOCAL].liobn, token);
1654 if (rc == H_SUCCESS) {
1655 strncpy(cap->name, dev_name(&vscsi->dma_dev->dev),
1658 len = olen - min_len;
1659 status = VIOSRP_MAD_SUCCESS;
1660 common = (struct mad_capability_common *)&cap->migration;
1662 while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) {
1663 dev_dbg(&vscsi->dev, "cap_mad: len left %hd, cap type %d, cap len %hd\n",
1664 len, be32_to_cpu(common->cap_type),
1665 be16_to_cpu(common->length));
1667 cap_len = be16_to_cpu(common->length);
1668 if (cap_len > len) {
1669 dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n");
1670 status = VIOSRP_MAD_FAILED;
1675 dev_err(&vscsi->dev, "cap_mad: cap len is 0\n");
1676 status = VIOSRP_MAD_FAILED;
1680 switch (common->cap_type) {
1682 dev_dbg(&vscsi->dev, "cap_mad: unsupported capability\n");
1683 common->server_support = 0;
1684 flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED);
1685 cap->flags &= ~flag;
1689 len = len - cap_len;
1690 common = (struct mad_capability_common *)
1691 ((char *)common + cap_len);
1694 mad->common.status = cpu_to_be16(status);
1697 rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token,
1698 vscsi->dds.window[REMOTE].liobn,
1699 be64_to_cpu(mad->buffer));
1701 if (rc != H_SUCCESS) {
1702 dev_dbg(&vscsi->dev, "cap_mad: failed to copy to client, rc %ld\n",
1705 if (rc == H_PERMISSION) {
1706 if (connection_broken(vscsi))
1707 flag_bits = (RESPONSE_Q_DOWN |
1711 dev_warn(&vscsi->dev, "cap_mad: error copying data to client, rc %ld\n",
1713 ibmvscsis_post_disconnect(vscsi,
1714 ERR_DISCONNECT_RECONNECT,
1719 dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token);
1721 dev_dbg(&vscsi->dev, "Leaving cap_mad, rc %ld, client_cap 0x%x\n",
1722 rc, vscsi->client_cap);
1728 * ibmvscsis_process_mad() - Service a MAnagement Data gram
1729 * @vscsi: Pointer to our adapter structure
1730 * @iue: Information Unit containing the MAD request
1732 * Must be called with interrupt lock held.
1734 static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue)
1736 struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
1737 struct viosrp_empty_iu *empty;
1738 long rc = ADAPT_SUCCESS;
1740 switch (be32_to_cpu(mad->type)) {
1741 case VIOSRP_EMPTY_IU_TYPE:
1742 empty = &vio_iu(iue)->mad.empty_iu;
1743 vscsi->empty_iu_id = be64_to_cpu(empty->buffer);
1744 vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag);
1745 mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1747 case VIOSRP_ADAPTER_INFO_TYPE:
1748 rc = ibmvscsis_adapter_info(vscsi, iue);
1750 case VIOSRP_CAPABILITIES_TYPE:
1751 rc = ibmvscsis_cap_mad(vscsi, iue);
1753 case VIOSRP_ENABLE_FAST_FAIL:
1754 if (vscsi->state == CONNECTED) {
1755 vscsi->fast_fail = true;
1756 mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1758 dev_warn(&vscsi->dev, "fast fail mad sent after login\n");
1759 mad->status = cpu_to_be16(VIOSRP_MAD_FAILED);
1763 mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED);
1771 * srp_snd_msg_failed() - Handle an error when sending a response
1772 * @vscsi: Pointer to our adapter structure
1773 * @rc: The return code from the h_send_crq command
1775 * Must be called with interrupt lock held.
1777 static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc)
1781 if (rc != H_DROPPED) {
1782 ibmvscsis_free_cmd_qs(vscsi);
1785 vscsi->flags |= CLIENT_FAILED;
1787 /* don't flag the same problem multiple times */
1788 if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
1789 vscsi->flags |= RESPONSE_Q_DOWN;
1790 if (!(vscsi->state & (ERR_DISCONNECT |
1791 ERR_DISCONNECT_RECONNECT |
1792 ERR_DISCONNECTED | UNDEFINED))) {
1793 dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n",
1794 vscsi->state, vscsi->flags, rc);
1796 ibmvscsis_post_disconnect(vscsi,
1797 ERR_DISCONNECT_RECONNECT, 0);
1803 * The response queue is full.
1804 * If the server is processing SRP requests, i.e.
1805 * the client has successfully done an
1806 * SRP_LOGIN, then it will wait forever for room in
1807 * the queue. However if the system admin
1808 * is attempting to unconfigure the server then one
1809 * or more children will be in a state where
1810 * they are being removed. So if there is even one
1811 * child being removed then the driver assumes
1812 * the system admin is attempting to break the
1813 * connection with the client and MAX_TIMER_POPS
1816 if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) ||
1817 (vscsi->state == SRP_PROCESSING)) {
1818 dev_dbg(&vscsi->dev, "snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n",
1819 vscsi->flags, (int)vscsi->rsp_q_timer.started,
1820 vscsi->rsp_q_timer.timer_pops);
1823 * Check if the timer is running; if it
1824 * is not then start it up.
1826 if (!vscsi->rsp_q_timer.started) {
1827 if (vscsi->rsp_q_timer.timer_pops <
1829 kt = WAIT_NANO_SECONDS;
1832 * slide the timeslice if the maximum
1833 * timer pops have already happened
1835 kt = ktime_set(WAIT_SECONDS, 0);
1838 vscsi->rsp_q_timer.started = true;
1839 hrtimer_start(&vscsi->rsp_q_timer.timer, kt,
1844 * TBD: Do we need to worry about this? Need to get
1848 * waited a long time and it appears the system admin
1849 * is bring this driver down
1851 vscsi->flags |= RESPONSE_Q_DOWN;
1852 ibmvscsis_free_cmd_qs(vscsi);
1854 * if the driver is already attempting to disconnect
1855 * from the client and has already logged an error
1856 * trace this event but don't put it in the error log
1858 if (!(vscsi->state & (ERR_DISCONNECT |
1859 ERR_DISCONNECT_RECONNECT |
1860 ERR_DISCONNECTED | UNDEFINED))) {
1861 dev_err(&vscsi->dev, "client crq full too long\n");
1862 ibmvscsis_post_disconnect(vscsi,
1863 ERR_DISCONNECT_RECONNECT,
1870 * ibmvscsis_send_messages() - Send a Response
1871 * @vscsi: Pointer to our adapter structure
1873 * Send a response, first checking the waiting queue. Responses are
1874 * sent in order they are received. If the response cannot be sent,
1875 * because the client queue is full, it stays on the waiting queue.
1878 * Called with interrupt lock held
1880 static void ibmvscsis_send_messages(struct scsi_info *vscsi)
1883 /* note do not attempt to access the IU_data_ptr with this pointer
1886 struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi;
1887 struct ibmvscsis_cmd *cmd, *nxt;
1888 struct iu_entry *iue;
1889 long rc = ADAPT_SUCCESS;
1892 if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
1895 list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp,
1898 * Check to make sure abort cmd gets processed
1899 * prior to the abort tmr cmd
1901 if (cmd->flags & DELAY_SEND)
1904 if (cmd->abort_cmd) {
1906 cmd->abort_cmd->flags &= ~(DELAY_SEND);
1907 cmd->abort_cmd = NULL;
1911 * If CMD_T_ABORTED w/o CMD_T_TAS scenarios and
1912 * the case where LIO issued a
1913 * ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST
1914 * case then we dont send a response, since it
1917 if (cmd->se_cmd.transport_state & CMD_T_ABORTED &&
1918 !(cmd->se_cmd.transport_state & CMD_T_TAS)) {
1919 list_del(&cmd->list);
1920 ibmvscsis_free_cmd_resources(vscsi,
1923 * With a successfully aborted op
1924 * through LIO we want to increment the
1925 * the vscsi credit so that when we dont
1926 * send a rsp to the original scsi abort
1927 * op (h_send_crq), but the tm rsp to
1928 * the abort is sent, the credit is
1929 * correctly sent with the abort tm rsp.
1930 * We would need 1 for the abort tm rsp
1931 * and 1 credit for the aborted scsi op.
1932 * Thus we need to increment here.
1933 * Also we want to increment the credit
1934 * here because we want to make sure
1935 * cmd is actually released first
1936 * otherwise the client will think it
1937 * it can send a new cmd, and we could
1938 * find ourselves short of cmd elements.
1944 crq->valid = VALID_CMD_RESP_EL;
1945 crq->format = cmd->rsp.format;
1947 if (cmd->flags & CMD_FAST_FAIL)
1948 crq->status = VIOSRP_ADAPTER_FAIL;
1950 crq->IU_length = cpu_to_be16(cmd->rsp.len);
1952 rc = h_send_crq(vscsi->dma_dev->unit_address,
1953 be64_to_cpu(msg_hi),
1954 be64_to_cpu(cmd->rsp.tag));
1956 dev_dbg(&vscsi->dev, "send_messages: cmd %p, tag 0x%llx, rc %ld\n",
1957 cmd, be64_to_cpu(cmd->rsp.tag),
1960 /* if all ok free up the command
1963 if (rc == H_SUCCESS) {
1964 /* some movement has occurred */
1965 vscsi->rsp_q_timer.timer_pops = 0;
1966 list_del(&cmd->list);
1968 ibmvscsis_free_cmd_resources(vscsi,
1971 srp_snd_msg_failed(vscsi, rc);
1980 * The timer could pop with the queue empty. If
1981 * this happens, rc will always indicate a
1982 * success; clear the pop count.
1984 vscsi->rsp_q_timer.timer_pops = 0;
1987 ibmvscsis_free_cmd_qs(vscsi);
1991 /* Called with intr lock held */
1992 static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi,
1993 struct ibmvscsis_cmd *cmd,
1994 struct viosrp_crq *crq)
1996 struct iu_entry *iue = cmd->iue;
1997 struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
2002 rc = h_copy_rdma(sizeof(struct mad_common),
2003 vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
2004 vscsi->dds.window[REMOTE].liobn,
2005 be64_to_cpu(crq->IU_data_ptr));
2007 cmd->rsp.format = VIOSRP_MAD_FORMAT;
2008 cmd->rsp.len = sizeof(struct mad_common);
2009 cmd->rsp.tag = mad->tag;
2010 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2011 ibmvscsis_send_messages(vscsi);
2013 dev_dbg(&vscsi->dev, "Error sending mad response, rc %ld\n",
2015 if (rc == H_PERMISSION) {
2016 if (connection_broken(vscsi))
2017 flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
2019 dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n",
2022 ibmvscsis_free_cmd_resources(vscsi, cmd);
2023 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2029 * ibmvscsis_mad() - Service a MAnagement Data gram.
2030 * @vscsi: Pointer to our adapter structure
2031 * @crq: Pointer to the CRQ entry containing the MAD request
2033 * EXECUTION ENVIRONMENT:
2034 * Interrupt, called with adapter lock held
2036 static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq)
2038 struct iu_entry *iue;
2039 struct ibmvscsis_cmd *cmd;
2040 struct mad_common *mad;
2041 long rc = ADAPT_SUCCESS;
2043 switch (vscsi->state) {
2045 * We have not exchanged Init Msgs yet, so this MAD was sent
2046 * before the last Transport Event; client will not be
2047 * expecting a response.
2049 case WAIT_CONNECTION:
2050 dev_dbg(&vscsi->dev, "mad: in Wait Connection state, ignoring MAD, flags %d\n",
2052 return ADAPT_SUCCESS;
2054 case SRP_PROCESSING:
2059 * We should never get here while we're in these states.
2060 * Just log an error and get out.
2064 case ERR_DISCONNECT:
2065 case ERR_DISCONNECT_RECONNECT:
2067 dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n",
2069 return ADAPT_SUCCESS;
2072 cmd = ibmvscsis_get_free_cmd(vscsi);
2074 dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n",
2076 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2080 cmd->type = ADAPTER_MAD;
2082 rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
2084 mad = (struct mad_common *)&vio_iu(iue)->mad;
2086 dev_dbg(&vscsi->dev, "mad: type %d\n", be32_to_cpu(mad->type));
2088 rc = ibmvscsis_process_mad(vscsi, iue);
2090 dev_dbg(&vscsi->dev, "mad: status %hd, rc %ld\n",
2091 be16_to_cpu(mad->status), rc);
2094 ibmvscsis_send_mad_resp(vscsi, cmd, crq);
2096 ibmvscsis_free_cmd_resources(vscsi, cmd);
2099 dev_dbg(&vscsi->dev, "Leaving mad, rc %ld\n", rc);
2104 * ibmvscsis_login_rsp() - Create/copy a login response notice to the client
2105 * @vscsi: Pointer to our adapter structure
2106 * @cmd: Pointer to the command for the SRP Login request
2108 * EXECUTION ENVIRONMENT:
2109 * Interrupt, interrupt lock held
2111 static long ibmvscsis_login_rsp(struct scsi_info *vscsi,
2112 struct ibmvscsis_cmd *cmd)
2114 struct iu_entry *iue = cmd->iue;
2115 struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp;
2116 struct format_code *fmt;
2118 long rc = ADAPT_SUCCESS;
2120 memset(rsp, 0, sizeof(struct srp_login_rsp));
2122 rsp->opcode = SRP_LOGIN_RSP;
2123 rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit);
2124 rsp->tag = cmd->rsp.tag;
2125 rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
2126 rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
2127 fmt = (struct format_code *)&rsp->buf_fmt;
2128 fmt->buffers = SUPPORTED_FORMATS;
2131 cmd->rsp.len = sizeof(struct srp_login_rsp);
2134 rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
2135 iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
2136 be64_to_cpu(iue->remote_token));
2143 if (connection_broken(vscsi))
2144 flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
2145 dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
2147 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2153 dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
2155 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2163 * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client
2164 * @vscsi: Pointer to our adapter structure
2165 * @cmd: Pointer to the command for the SRP Login request
2166 * @reason: The reason the SRP Login is being rejected, per SRP protocol
2168 * EXECUTION ENVIRONMENT:
2169 * Interrupt, interrupt lock held
2171 static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi,
2172 struct ibmvscsis_cmd *cmd, u32 reason)
2174 struct iu_entry *iue = cmd->iue;
2175 struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej;
2176 struct format_code *fmt;
2178 long rc = ADAPT_SUCCESS;
2180 memset(rej, 0, sizeof(*rej));
2182 rej->opcode = SRP_LOGIN_REJ;
2183 rej->reason = cpu_to_be32(reason);
2184 rej->tag = cmd->rsp.tag;
2185 fmt = (struct format_code *)&rej->buf_fmt;
2186 fmt->buffers = SUPPORTED_FORMATS;
2188 cmd->rsp.len = sizeof(*rej);
2191 rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
2192 iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
2193 be64_to_cpu(iue->remote_token));
2199 if (connection_broken(vscsi))
2200 flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
2201 dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
2203 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2209 dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
2211 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2218 static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport)
2220 char *name = tport->tport_name;
2221 struct ibmvscsis_nexus *nexus;
2222 struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
2225 if (tport->ibmv_nexus) {
2226 dev_dbg(&vscsi->dev, "tport->ibmv_nexus already exists\n");
2230 nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
2232 dev_err(&vscsi->dev, "Unable to allocate struct ibmvscsis_nexus\n");
2236 nexus->se_sess = target_setup_session(&tport->se_tpg, 0, 0,
2237 TARGET_PROT_NORMAL, name, nexus,
2239 if (IS_ERR(nexus->se_sess)) {
2240 rc = PTR_ERR(nexus->se_sess);
2241 goto transport_init_fail;
2244 tport->ibmv_nexus = nexus;
2248 transport_init_fail:
2253 static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport)
2255 struct se_session *se_sess;
2256 struct ibmvscsis_nexus *nexus;
2258 nexus = tport->ibmv_nexus;
2262 se_sess = nexus->se_sess;
2267 * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port
2269 target_remove_session(se_sess);
2270 tport->ibmv_nexus = NULL;
2277 * ibmvscsis_srp_login() - Process an SRP Login Request
2278 * @vscsi: Pointer to our adapter structure
2279 * @cmd: Command element to use to process the SRP Login request
2280 * @crq: Pointer to CRQ entry containing the SRP Login request
2282 * EXECUTION ENVIRONMENT:
2283 * Interrupt, called with interrupt lock held
2285 static long ibmvscsis_srp_login(struct scsi_info *vscsi,
2286 struct ibmvscsis_cmd *cmd,
2287 struct viosrp_crq *crq)
2289 struct iu_entry *iue = cmd->iue;
2290 struct srp_login_req *req = &vio_iu(iue)->srp.login_req;
2292 __be64 id_extension;
2295 struct format_code *fmt;
2297 long rc = ADAPT_SUCCESS;
2299 iport = (struct port_id *)req->initiator_port_id;
2300 tport = (struct port_id *)req->target_port_id;
2301 fmt = (struct format_code *)&req->req_buf_fmt;
2302 if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN)
2303 reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE;
2304 else if (be32_to_cpu(req->req_it_iu_len) < 64)
2305 reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
2306 else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) ||
2307 (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1)))
2308 reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL;
2309 else if (req->req_flags & SRP_MULTICHAN_MULTI)
2310 reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED;
2311 else if (fmt->buffers & (~SUPPORTED_FORMATS))
2312 reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
2313 else if ((fmt->buffers & SUPPORTED_FORMATS) == 0)
2314 reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
2316 if (vscsi->state == SRP_PROCESSING)
2317 reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED;
2319 rc = ibmvscsis_make_nexus(&vscsi->tport);
2321 reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
2323 cmd->rsp.format = VIOSRP_SRP_FORMAT;
2324 cmd->rsp.tag = req->tag;
2326 dev_dbg(&vscsi->dev, "srp_login: reason 0x%x\n", reason);
2329 rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason);
2331 rc = ibmvscsis_login_rsp(vscsi, cmd);
2335 vscsi->state = SRP_PROCESSING;
2337 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2338 ibmvscsis_send_messages(vscsi);
2340 ibmvscsis_free_cmd_resources(vscsi, cmd);
2343 dev_dbg(&vscsi->dev, "Leaving srp_login, rc %ld\n", rc);
2348 * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus
2349 * @vscsi: Pointer to our adapter structure
2350 * @cmd: Command element to use to process the Implicit Logout request
2351 * @crq: Pointer to CRQ entry containing the Implicit Logout request
2353 * Do the logic to close the I_T nexus. This function may not
2354 * behave to specification.
2356 * EXECUTION ENVIRONMENT:
2357 * Interrupt, interrupt lock held
2359 static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi,
2360 struct ibmvscsis_cmd *cmd,
2361 struct viosrp_crq *crq)
2363 struct iu_entry *iue = cmd->iue;
2364 struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout;
2365 long rc = ADAPT_SUCCESS;
2367 if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) ||
2368 !list_empty(&vscsi->waiting_rsp)) {
2369 dev_err(&vscsi->dev, "i_logout: outstanding work\n");
2370 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
2372 cmd->rsp.format = SRP_FORMAT;
2373 cmd->rsp.tag = log_out->tag;
2374 cmd->rsp.len = sizeof(struct mad_common);
2375 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2376 ibmvscsis_send_messages(vscsi);
2378 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
2384 /* Called with intr lock held */
2385 static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq)
2387 struct ibmvscsis_cmd *cmd;
2388 struct iu_entry *iue;
2389 struct srp_cmd *srp;
2390 struct srp_tsk_mgmt *tsk;
2393 if (vscsi->request_limit - vscsi->debit <= 0) {
2394 /* Client has exceeded request limit */
2395 dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n",
2396 vscsi->request_limit, vscsi->debit);
2397 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2401 cmd = ibmvscsis_get_free_cmd(vscsi);
2403 dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n",
2405 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2409 srp = &vio_iu(iue)->srp.cmd;
2411 rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
2413 ibmvscsis_free_cmd_resources(vscsi, cmd);
2417 if (vscsi->state == SRP_PROCESSING) {
2418 switch (srp->opcode) {
2420 rc = ibmvscsis_srp_login(vscsi, cmd, crq);
2424 tsk = &vio_iu(iue)->srp.tsk_mgmt;
2425 dev_dbg(&vscsi->dev, "tsk_mgmt tag: %llu (0x%llx)\n",
2426 tsk->tag, tsk->tag);
2427 cmd->rsp.tag = tsk->tag;
2429 cmd->type = TASK_MANAGEMENT;
2430 list_add_tail(&cmd->list, &vscsi->schedule_q);
2431 queue_work(vscsi->work_q, &cmd->work);
2435 dev_dbg(&vscsi->dev, "srp_cmd tag: %llu (0x%llx)\n",
2436 srp->tag, srp->tag);
2437 cmd->rsp.tag = srp->tag;
2439 cmd->type = SCSI_CDB;
2441 * We want to keep track of work waiting for
2444 list_add_tail(&cmd->list, &vscsi->schedule_q);
2445 queue_work(vscsi->work_q, &cmd->work);
2449 rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq);
2455 ibmvscsis_free_cmd_resources(vscsi, cmd);
2456 dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n",
2458 ibmvscsis_post_disconnect(vscsi,
2459 ERR_DISCONNECT_RECONNECT, 0);
2462 } else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) {
2463 rc = ibmvscsis_srp_login(vscsi, cmd, crq);
2465 ibmvscsis_free_cmd_resources(vscsi, cmd);
2466 dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n",
2468 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2473 * ibmvscsis_ping_response() - Respond to a ping request
2474 * @vscsi: Pointer to our adapter structure
2476 * Let the client know that the server is alive and waiting on
2477 * its native I/O stack.
2478 * If any type of error occurs from the call to queue a ping
2479 * response then the client is either not accepting or receiving
2480 * interrupts. Disconnect with an error.
2482 * EXECUTION ENVIRONMENT:
2483 * Interrupt, interrupt lock held
2485 static long ibmvscsis_ping_response(struct scsi_info *vscsi)
2487 struct viosrp_crq *crq;
2488 u64 buffer[2] = { 0, 0 };
2491 crq = (struct viosrp_crq *)&buffer;
2492 crq->valid = VALID_CMD_RESP_EL;
2493 crq->format = (u8)MESSAGE_IN_CRQ;
2494 crq->status = PING_RESPONSE;
2496 rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
2497 cpu_to_be64(buffer[MSG_LOW]));
2503 vscsi->flags |= CLIENT_FAILED;
2505 vscsi->flags |= RESPONSE_Q_DOWN;
2507 dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n",
2509 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2512 dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n",
2514 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
2522 * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue.
2523 * @vscsi: Pointer to our adapter structure
2524 * @crq: Pointer to CRQ element containing the SRP request
2526 * This function will return success if the command queue element is valid
2527 * and the srp iu or MAD request it pointed to was also valid. That does
2528 * not mean that an error was not returned to the client.
2530 * EXECUTION ENVIRONMENT:
2531 * Interrupt, intr lock held
2533 static long ibmvscsis_parse_command(struct scsi_info *vscsi,
2534 struct viosrp_crq *crq)
2536 long rc = ADAPT_SUCCESS;
2538 switch (crq->valid) {
2539 case VALID_CMD_RESP_EL:
2540 switch (crq->format) {
2545 if (vscsi->flags & PROCESSING_MAD) {
2547 dev_err(&vscsi->dev, "parse_command: already processing mad\n");
2548 ibmvscsis_post_disconnect(vscsi,
2549 ERR_DISCONNECT_RECONNECT,
2552 vscsi->flags |= PROCESSING_MAD;
2553 rc = ibmvscsis_mad(vscsi, crq);
2558 ibmvscsis_srp_cmd(vscsi, crq);
2561 case MESSAGE_IN_CRQ:
2562 if (crq->status == PING)
2563 ibmvscsis_ping_response(vscsi);
2567 dev_err(&vscsi->dev, "parse_command: invalid format %d\n",
2569 ibmvscsis_post_disconnect(vscsi,
2570 ERR_DISCONNECT_RECONNECT, 0);
2575 case VALID_TRANS_EVENT:
2576 rc = ibmvscsis_trans_event(vscsi, crq);
2579 case VALID_INIT_MSG:
2580 rc = ibmvscsis_init_msg(vscsi, crq);
2584 dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n",
2586 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2591 * Return only what the interrupt handler cares
2592 * about. Most errors we keep right on trucking.
2594 rc = vscsi->flags & SCHEDULE_DISCONNECT;
2599 static int read_dma_window(struct scsi_info *vscsi)
2601 struct vio_dev *vdev = vscsi->dma_dev;
2602 const __be32 *dma_window;
2605 /* TODO Using of_parse_dma_window would be better, but it doesn't give
2606 * a way to read multiple windows without already knowing the size of
2607 * a window or the number of windows.
2609 dma_window = (const __be32 *)vio_get_attribute(vdev,
2610 "ibm,my-dma-window",
2613 dev_err(&vscsi->dev, "Couldn't find ibm,my-dma-window property\n");
2617 vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window);
2620 prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells",
2623 dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-address-cells property\n");
2626 dma_window += be32_to_cpu(*prop);
2629 prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells",
2632 dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-size-cells property\n");
2635 dma_window += be32_to_cpu(*prop);
2638 /* dma_window should point to the second window now */
2639 vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window);
2644 static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name)
2646 struct ibmvscsis_tport *tport = NULL;
2647 struct vio_dev *vdev;
2648 struct scsi_info *vscsi;
2650 spin_lock_bh(&ibmvscsis_dev_lock);
2651 list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) {
2652 vdev = vscsi->dma_dev;
2653 if (!strcmp(dev_name(&vdev->dev), name)) {
2654 tport = &vscsi->tport;
2658 spin_unlock_bh(&ibmvscsis_dev_lock);
2664 * ibmvscsis_parse_cmd() - Parse SRP Command
2665 * @vscsi: Pointer to our adapter structure
2666 * @cmd: Pointer to command element with SRP command
2668 * Parse the srp command; if it is valid then submit it to tcm.
2669 * Note: The return code does not reflect the status of the SCSI CDB.
2671 * EXECUTION ENVIRONMENT:
2674 static void ibmvscsis_parse_cmd(struct scsi_info *vscsi,
2675 struct ibmvscsis_cmd *cmd)
2677 struct iu_entry *iue = cmd->iue;
2678 struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
2679 struct ibmvscsis_nexus *nexus;
2681 enum dma_data_direction dir;
2685 nexus = vscsi->tport.ibmv_nexus;
2687 * additional length in bytes. Note that the SRP spec says that
2688 * additional length is in 4-byte words, but technically the
2689 * additional length field is only the upper 6 bits of the byte.
2690 * The lower 2 bits are reserved. If the lower 2 bits are 0 (as
2691 * all reserved fields should be), then interpreting the byte as
2692 * an int will yield the length in bytes.
2694 if (srp->add_cdb_len & 0x03) {
2695 dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n");
2696 spin_lock_bh(&vscsi->intr_lock);
2697 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2698 ibmvscsis_free_cmd_resources(vscsi, cmd);
2699 spin_unlock_bh(&vscsi->intr_lock);
2703 if (srp_get_desc_table(srp, &dir, &data_len)) {
2704 dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n",
2709 cmd->rsp.sol_not = srp->sol_not;
2711 switch (srp->task_attr) {
2712 case SRP_SIMPLE_TASK:
2713 attr = TCM_SIMPLE_TAG;
2715 case SRP_ORDERED_TASK:
2716 attr = TCM_ORDERED_TAG;
2719 attr = TCM_HEAD_TAG;
2725 dev_err(&vscsi->dev, "Invalid task attribute %d\n",
2730 cmd->se_cmd.tag = be64_to_cpu(srp->tag);
2732 spin_lock_bh(&vscsi->intr_lock);
2733 list_add_tail(&cmd->list, &vscsi->active_q);
2734 spin_unlock_bh(&vscsi->intr_lock);
2736 srp->lun.scsi_lun[0] &= 0x3f;
2738 rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb,
2739 cmd->sense_buf, scsilun_to_int(&srp->lun),
2740 data_len, attr, dir, 0);
2742 dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc);
2743 spin_lock_bh(&vscsi->intr_lock);
2744 list_del(&cmd->list);
2745 ibmvscsis_free_cmd_resources(vscsi, cmd);
2746 spin_unlock_bh(&vscsi->intr_lock);
2752 spin_lock_bh(&vscsi->intr_lock);
2753 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2754 spin_unlock_bh(&vscsi->intr_lock);
2758 * ibmvscsis_parse_task() - Parse SRP Task Management Request
2759 * @vscsi: Pointer to our adapter structure
2760 * @cmd: Pointer to command element with SRP task management request
2762 * Parse the srp task management request; if it is valid then submit it to tcm.
2763 * Note: The return code does not reflect the status of the task management
2766 * EXECUTION ENVIRONMENT:
2769 static void ibmvscsis_parse_task(struct scsi_info *vscsi,
2770 struct ibmvscsis_cmd *cmd)
2772 struct iu_entry *iue = cmd->iue;
2773 struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
2775 u64 tag_to_abort = 0;
2777 struct ibmvscsis_nexus *nexus;
2779 nexus = vscsi->tport.ibmv_nexus;
2781 cmd->rsp.sol_not = srp_tsk->sol_not;
2783 switch (srp_tsk->tsk_mgmt_func) {
2784 case SRP_TSK_ABORT_TASK:
2785 tcm_type = TMR_ABORT_TASK;
2786 tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
2788 case SRP_TSK_ABORT_TASK_SET:
2789 tcm_type = TMR_ABORT_TASK_SET;
2791 case SRP_TSK_CLEAR_TASK_SET:
2792 tcm_type = TMR_CLEAR_TASK_SET;
2794 case SRP_TSK_LUN_RESET:
2795 tcm_type = TMR_LUN_RESET;
2797 case SRP_TSK_CLEAR_ACA:
2798 tcm_type = TMR_CLEAR_ACA;
2801 dev_err(&vscsi->dev, "unknown task mgmt func %d\n",
2802 srp_tsk->tsk_mgmt_func);
2803 cmd->se_cmd.se_tmr_req->response =
2804 TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2810 cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag);
2812 spin_lock_bh(&vscsi->intr_lock);
2813 list_add_tail(&cmd->list, &vscsi->active_q);
2814 spin_unlock_bh(&vscsi->intr_lock);
2816 srp_tsk->lun.scsi_lun[0] &= 0x3f;
2818 dev_dbg(&vscsi->dev, "calling submit_tmr, func %d\n",
2819 srp_tsk->tsk_mgmt_func);
2820 rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL,
2821 scsilun_to_int(&srp_tsk->lun), srp_tsk,
2822 tcm_type, GFP_KERNEL, tag_to_abort, 0);
2824 dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n",
2826 spin_lock_bh(&vscsi->intr_lock);
2827 list_del(&cmd->list);
2828 spin_unlock_bh(&vscsi->intr_lock);
2829 cmd->se_cmd.se_tmr_req->response =
2830 TMR_FUNCTION_REJECTED;
2835 transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0);
2838 static void ibmvscsis_scheduler(struct work_struct *work)
2840 struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd,
2842 struct scsi_info *vscsi = cmd->adapter;
2844 spin_lock_bh(&vscsi->intr_lock);
2846 /* Remove from schedule_q */
2847 list_del(&cmd->list);
2849 /* Don't submit cmd if we're disconnecting */
2850 if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) {
2851 ibmvscsis_free_cmd_resources(vscsi, cmd);
2853 /* ibmvscsis_disconnect might be waiting for us */
2854 if (list_empty(&vscsi->active_q) &&
2855 list_empty(&vscsi->schedule_q) &&
2856 (vscsi->flags & WAIT_FOR_IDLE)) {
2857 vscsi->flags &= ~WAIT_FOR_IDLE;
2858 complete(&vscsi->wait_idle);
2861 spin_unlock_bh(&vscsi->intr_lock);
2865 spin_unlock_bh(&vscsi->intr_lock);
2867 switch (cmd->type) {
2869 ibmvscsis_parse_cmd(vscsi, cmd);
2871 case TASK_MANAGEMENT:
2872 ibmvscsis_parse_task(vscsi, cmd);
2875 dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n",
2877 spin_lock_bh(&vscsi->intr_lock);
2878 ibmvscsis_free_cmd_resources(vscsi, cmd);
2879 spin_unlock_bh(&vscsi->intr_lock);
2884 static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num)
2886 struct ibmvscsis_cmd *cmd;
2889 INIT_LIST_HEAD(&vscsi->free_cmd);
2890 vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd),
2892 if (!vscsi->cmd_pool)
2895 for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num;
2897 cmd->abort_cmd = NULL;
2898 cmd->adapter = vscsi;
2899 INIT_WORK(&cmd->work, ibmvscsis_scheduler);
2900 list_add_tail(&cmd->list, &vscsi->free_cmd);
2906 static void ibmvscsis_free_cmds(struct scsi_info *vscsi)
2908 kfree(vscsi->cmd_pool);
2909 vscsi->cmd_pool = NULL;
2910 INIT_LIST_HEAD(&vscsi->free_cmd);
2914 * ibmvscsis_service_wait_q() - Service Waiting Queue
2915 * @timer: Pointer to timer which has expired
2917 * This routine is called when the timer pops to service the waiting
2918 * queue. Elements on the queue have completed, their responses have been
2919 * copied to the client, but the client's response queue was full so
2920 * the queue message could not be sent. The routine grabs the proper locks
2921 * and calls send messages.
2923 * EXECUTION ENVIRONMENT:
2924 * called at interrupt level
2926 static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer)
2928 struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer);
2929 struct scsi_info *vscsi = container_of(p_timer, struct scsi_info,
2932 spin_lock_bh(&vscsi->intr_lock);
2933 p_timer->timer_pops += 1;
2934 p_timer->started = false;
2935 ibmvscsis_send_messages(vscsi);
2936 spin_unlock_bh(&vscsi->intr_lock);
2938 return HRTIMER_NORESTART;
2941 static long ibmvscsis_alloctimer(struct scsi_info *vscsi)
2943 struct timer_cb *p_timer;
2945 p_timer = &vscsi->rsp_q_timer;
2946 hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2948 p_timer->timer.function = ibmvscsis_service_wait_q;
2949 p_timer->started = false;
2950 p_timer->timer_pops = 0;
2952 return ADAPT_SUCCESS;
2955 static void ibmvscsis_freetimer(struct scsi_info *vscsi)
2957 struct timer_cb *p_timer;
2959 p_timer = &vscsi->rsp_q_timer;
2961 (void)hrtimer_cancel(&p_timer->timer);
2963 p_timer->started = false;
2964 p_timer->timer_pops = 0;
2967 static irqreturn_t ibmvscsis_interrupt(int dummy, void *data)
2969 struct scsi_info *vscsi = data;
2971 vio_disable_interrupts(vscsi->dma_dev);
2972 tasklet_schedule(&vscsi->work_task);
2978 * ibmvscsis_enable_change_state() - Set new state based on enabled status
2979 * @vscsi: Pointer to our adapter structure
2981 * This function determines our new state now that we are enabled. This
2982 * may involve sending an Init Complete message to the client.
2984 * Must be called with interrupt lock held.
2986 static long ibmvscsis_enable_change_state(struct scsi_info *vscsi)
2989 long rc = ADAPT_SUCCESS;
2991 bytes = vscsi->cmd_q.size * PAGE_SIZE;
2992 rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes);
2993 if (rc == H_CLOSED || rc == H_SUCCESS) {
2994 vscsi->state = WAIT_CONNECTION;
2995 rc = ibmvscsis_establish_new_q(vscsi);
2998 if (rc != ADAPT_SUCCESS) {
2999 vscsi->state = ERR_DISCONNECTED;
3000 vscsi->flags |= RESPONSE_Q_DOWN;
3007 * ibmvscsis_create_command_q() - Create Command Queue
3008 * @vscsi: Pointer to our adapter structure
3009 * @num_cmds: Currently unused. In the future, may be used to determine
3010 * the size of the CRQ.
3012 * Allocates memory for command queue maps remote memory into an ioba
3013 * initializes the command response queue
3015 * EXECUTION ENVIRONMENT:
3016 * Process level only
3018 static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds)
3021 struct vio_dev *vdev = vscsi->dma_dev;
3023 /* We might support multiple pages in the future, but just 1 for now */
3026 vscsi->cmd_q.size = pages;
3028 vscsi->cmd_q.base_addr =
3029 (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
3030 if (!vscsi->cmd_q.base_addr)
3033 vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1;
3035 vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev,
3036 vscsi->cmd_q.base_addr,
3037 PAGE_SIZE, DMA_BIDIRECTIONAL);
3038 if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) {
3039 free_page((unsigned long)vscsi->cmd_q.base_addr);
3047 * ibmvscsis_destroy_command_q - Destroy Command Queue
3048 * @vscsi: Pointer to our adapter structure
3050 * Releases memory for command queue and unmaps mapped remote memory.
3052 * EXECUTION ENVIRONMENT:
3053 * Process level only
3055 static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi)
3057 dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token,
3058 PAGE_SIZE, DMA_BIDIRECTIONAL);
3059 free_page((unsigned long)vscsi->cmd_q.base_addr);
3060 vscsi->cmd_q.base_addr = NULL;
3061 vscsi->state = NO_QUEUE;
3064 static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi,
3065 struct ibmvscsis_cmd *cmd)
3067 struct iu_entry *iue = cmd->iue;
3068 struct se_cmd *se_cmd = &cmd->se_cmd;
3069 struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
3070 struct scsi_sense_hdr sshdr;
3071 u8 rc = se_cmd->scsi_status;
3073 if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb)))
3074 if (scsi_normalize_sense(se_cmd->sense_buffer,
3075 se_cmd->scsi_sense_length, &sshdr))
3076 if (sshdr.sense_key == HARDWARE_ERROR &&
3077 (se_cmd->residual_count == 0 ||
3078 se_cmd->residual_count == se_cmd->data_length)) {
3080 cmd->flags |= CMD_FAST_FAIL;
3087 * srp_build_response() - Build an SRP response buffer
3088 * @vscsi: Pointer to our adapter structure
3089 * @cmd: Pointer to command for which to send the response
3090 * @len_p: Where to return the length of the IU response sent. This
3091 * is needed to construct the CRQ response.
3093 * Build the SRP response buffer and copy it to the client's memory space.
3095 static long srp_build_response(struct scsi_info *vscsi,
3096 struct ibmvscsis_cmd *cmd, uint *len_p)
3098 struct iu_entry *iue = cmd->iue;
3099 struct se_cmd *se_cmd = &cmd->se_cmd;
3100 struct srp_rsp *rsp;
3105 long rc = ADAPT_SUCCESS;
3107 spin_lock_bh(&vscsi->intr_lock);
3109 rsp = &vio_iu(iue)->srp.rsp;
3111 memset(rsp, 0, len);
3114 rsp->opcode = SRP_RSP;
3116 rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit);
3117 rsp->tag = cmd->rsp.tag;
3120 if (cmd->type == SCSI_CDB) {
3121 rsp->status = ibmvscsis_fast_fail(vscsi, cmd);
3123 dev_dbg(&vscsi->dev, "build_resp: cmd %p, scsi status %d\n",
3124 cmd, (int)rsp->status);
3125 ibmvscsis_determine_resid(se_cmd, rsp);
3126 if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) {
3127 rsp->sense_data_len =
3128 cpu_to_be32(se_cmd->scsi_sense_length);
3129 rsp->flags |= SRP_RSP_FLAG_SNSVALID;
3130 len += se_cmd->scsi_sense_length;
3131 memcpy(data, se_cmd->sense_buffer,
3132 se_cmd->scsi_sense_length);
3134 rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3136 } else if (cmd->flags & CMD_FAST_FAIL) {
3137 dev_dbg(&vscsi->dev, "build_resp: cmd %p, fast fail\n",
3139 rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3142 rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
3146 /* this is task management */
3148 rsp->resp_data_len = cpu_to_be32(4);
3149 rsp->flags |= SRP_RSP_FLAG_RSPVALID;
3151 switch (se_cmd->se_tmr_req->response) {
3152 case TMR_FUNCTION_COMPLETE:
3153 case TMR_TASK_DOES_NOT_EXIST:
3154 rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE;
3155 rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
3158 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3159 case TMR_LUN_DOES_NOT_EXIST:
3160 rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED;
3161 rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3164 case TMR_FUNCTION_FAILED:
3165 case TMR_FUNCTION_REJECTED:
3167 rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED;
3168 rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3173 tsk_status = (u32 *)data;
3174 *tsk_status = cpu_to_be32(rsp_code);
3175 data = (char *)(tsk_status + 1);
3180 rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
3181 vscsi->dds.window[REMOTE].liobn,
3182 be64_to_cpu(iue->remote_token));
3190 if (connection_broken(vscsi))
3191 vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED;
3193 dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n",
3194 rc, vscsi->flags, vscsi->state);
3199 dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n",
3204 spin_unlock_bh(&vscsi->intr_lock);
3209 static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg,
3210 int nsg, struct srp_direct_buf *md, int nmd,
3211 enum dma_data_direction dir, unsigned int bytes)
3213 struct iu_entry *iue = cmd->iue;
3214 struct srp_target *target = iue->target;
3215 struct scsi_info *vscsi = target->ldata;
3216 struct scatterlist *sgp;
3217 dma_addr_t client_ioba, server_ioba;
3219 ulong client_len, server_len;
3234 if (client_len == 0) {
3235 if (md_idx >= nmd) {
3236 dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n");
3240 client_ioba = be64_to_cpu(md[md_idx].va);
3241 client_len = be32_to_cpu(md[md_idx].len);
3243 if (server_len == 0) {
3245 dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n");
3249 server_ioba = sg_dma_address(sgp);
3250 server_len = sg_dma_len(sgp);
3255 if (buf_len > client_len)
3256 buf_len = client_len;
3258 if (buf_len > server_len)
3259 buf_len = server_len;
3261 if (buf_len > max_vdma_size)
3262 buf_len = max_vdma_size;
3264 if (dir == DMA_TO_DEVICE) {
3265 /* read from client */
3266 rc = h_copy_rdma(buf_len,
3267 vscsi->dds.window[REMOTE].liobn,
3269 vscsi->dds.window[LOCAL].liobn,
3272 /* The h_copy_rdma will cause phyp, running in another
3273 * partition, to read memory, so we need to make sure
3274 * the data has been written out, hence these syncs.
3276 /* ensure that everything is in memory */
3278 /* ensure that memory has been made visible */
3280 rc = h_copy_rdma(buf_len,
3281 vscsi->dds.window[LOCAL].liobn,
3283 vscsi->dds.window[REMOTE].liobn,
3292 if (connection_broken(vscsi)) {
3293 spin_lock_bh(&vscsi->intr_lock);
3295 (RESPONSE_Q_DOWN | CLIENT_FAILED);
3296 spin_unlock_bh(&vscsi->intr_lock);
3298 dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n",
3303 dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n",
3311 client_len -= buf_len;
3312 if (client_len == 0)
3315 client_ioba += buf_len;
3317 server_len -= buf_len;
3318 if (server_len == 0)
3321 server_ioba += buf_len;
3332 * ibmvscsis_handle_crq() - Handle CRQ
3333 * @data: Pointer to our adapter structure
3335 * Read the command elements from the command queue and copy the payloads
3336 * associated with the command elements to local memory and execute the
3339 * Note: this is an edge triggered interrupt. It can not be shared.
3341 static void ibmvscsis_handle_crq(unsigned long data)
3343 struct scsi_info *vscsi = (struct scsi_info *)data;
3344 struct viosrp_crq *crq;
3349 spin_lock_bh(&vscsi->intr_lock);
3351 dev_dbg(&vscsi->dev, "got interrupt\n");
3354 * if we are in a path where we are waiting for all pending commands
3355 * to complete because we received a transport event and anything in
3356 * the command queue is for a new connection, do nothing
3358 if (TARGET_STOP(vscsi)) {
3359 vio_enable_interrupts(vscsi->dma_dev);
3361 dev_dbg(&vscsi->dev, "handle_crq, don't process: flags 0x%x, state 0x%hx\n",
3362 vscsi->flags, vscsi->state);
3363 spin_unlock_bh(&vscsi->intr_lock);
3367 rc = vscsi->flags & SCHEDULE_DISCONNECT;
3368 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
3374 * These are edege triggered interrupts. After dropping out of
3375 * the while loop, the code must check for work since an
3376 * interrupt could be lost, and an elment be left on the queue,
3380 vscsi->cmd_q.index =
3381 (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;
3384 rc = ibmvscsis_parse_command(vscsi, crq);
3386 if ((uint)crq->valid == VALID_TRANS_EVENT) {
3388 * must service the transport layer events even
3389 * in an error state, dont break out until all
3390 * the consecutive transport events have been
3393 rc = ibmvscsis_trans_event(vscsi, crq);
3394 } else if (vscsi->flags & TRANS_EVENT) {
3396 * if a transport event has occurred leave
3397 * everything but transport events on the queue
3399 * need to decrement the queue index so we can
3400 * look at the element again
3402 if (vscsi->cmd_q.index)
3403 vscsi->cmd_q.index -= 1;
3406 * index is at 0 it just wrapped.
3407 * have it index last element in q
3409 vscsi->cmd_q.index = vscsi->cmd_q.mask;
3414 crq->valid = INVALIDATE_CMD_RESP_EL;
3416 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
3423 vio_enable_interrupts(vscsi->dma_dev);
3425 dev_dbg(&vscsi->dev, "handle_crq, reenabling interrupts\n");
3432 dev_dbg(&vscsi->dev, "handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n",
3433 vscsi->flags, vscsi->state, vscsi->cmd_q.index);
3436 dev_dbg(&vscsi->dev, "Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n",
3437 (int)list_empty(&vscsi->schedule_q), vscsi->flags,
3440 spin_unlock_bh(&vscsi->intr_lock);
3443 static int ibmvscsis_probe(struct vio_dev *vdev,
3444 const struct vio_device_id *id)
3446 struct scsi_info *vscsi;
3451 vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL);
3454 dev_err(&vdev->dev, "probe: allocation of adapter failed\n");
3458 vscsi->dma_dev = vdev;
3459 vscsi->dev = vdev->dev;
3460 INIT_LIST_HEAD(&vscsi->schedule_q);
3461 INIT_LIST_HEAD(&vscsi->waiting_rsp);
3462 INIT_LIST_HEAD(&vscsi->active_q);
3464 snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s",
3465 dev_name(&vdev->dev));
3467 dev_dbg(&vscsi->dev, "probe tport_name: %s\n", vscsi->tport.tport_name);
3469 rc = read_dma_window(vscsi);
3472 dev_dbg(&vscsi->dev, "Probe: liobn 0x%x, riobn 0x%x\n",
3473 vscsi->dds.window[LOCAL].liobn,
3474 vscsi->dds.window[REMOTE].liobn);
3476 snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name);
3478 vscsi->dds.unit_id = vdev->unit_address;
3479 strscpy(vscsi->dds.partition_name, partition_name,
3480 sizeof(vscsi->dds.partition_name));
3481 vscsi->dds.partition_num = partition_number;
3483 spin_lock_bh(&ibmvscsis_dev_lock);
3484 list_add_tail(&vscsi->list, &ibmvscsis_dev_list);
3485 spin_unlock_bh(&ibmvscsis_dev_lock);
3488 * TBD: How do we determine # of cmds to request? Do we know how
3489 * many "children" we have?
3491 vscsi->request_limit = INITIAL_SRP_LIMIT;
3492 rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit,
3497 vscsi->target.ldata = vscsi;
3499 rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit);
3501 dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n",
3502 rc, vscsi->request_limit);
3507 * Note: the lock is used in freeing timers, so must initialize
3508 * first so that ordering in case of error is correct.
3510 spin_lock_init(&vscsi->intr_lock);
3512 rc = ibmvscsis_alloctimer(vscsi);
3514 dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc);
3518 rc = ibmvscsis_create_command_q(vscsi, 256);
3520 dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n",
3525 vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
3526 if (!vscsi->map_buf) {
3528 dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n");
3532 vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE,
3534 if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) {
3536 dev_err(&vscsi->dev, "probe: error mapping command buffer\n");
3540 hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
3541 (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
3543 if (hrc == H_SUCCESS)
3544 vscsi->client_data.partition_number =
3545 be64_to_cpu(*(u64 *)vscsi->map_buf);
3547 * We expect the VIOCTL to fail if we're configured as "any
3548 * client can connect" and the client isn't activated yet.
3549 * We'll make the call again when he sends an init msg.
3551 dev_dbg(&vscsi->dev, "probe hrc %ld, client partition num %d\n",
3552 hrc, vscsi->client_data.partition_number);
3554 tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq,
3555 (unsigned long)vscsi);
3557 init_completion(&vscsi->wait_idle);
3558 init_completion(&vscsi->unconfig);
3560 snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev));
3561 vscsi->work_q = create_workqueue(wq_name);
3562 if (!vscsi->work_q) {
3564 dev_err(&vscsi->dev, "create_workqueue failed\n");
3568 rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi);
3571 dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc);
3575 vscsi->state = WAIT_ENABLED;
3577 dev_set_drvdata(&vdev->dev, vscsi);
3582 destroy_workqueue(vscsi->work_q);
3584 dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
3587 kfree(vscsi->map_buf);
3589 tasklet_kill(&vscsi->work_task);
3590 ibmvscsis_unregister_command_q(vscsi);
3591 ibmvscsis_destroy_command_q(vscsi);
3593 ibmvscsis_freetimer(vscsi);
3595 ibmvscsis_free_cmds(vscsi);
3597 srp_target_free(&vscsi->target);
3599 spin_lock_bh(&ibmvscsis_dev_lock);
3600 list_del(&vscsi->list);
3601 spin_unlock_bh(&ibmvscsis_dev_lock);
3608 static int ibmvscsis_remove(struct vio_dev *vdev)
3610 struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev);
3612 dev_dbg(&vscsi->dev, "remove (%s)\n", dev_name(&vscsi->dma_dev->dev));
3614 spin_lock_bh(&vscsi->intr_lock);
3615 ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0);
3616 vscsi->flags |= CFG_SLEEPING;
3617 spin_unlock_bh(&vscsi->intr_lock);
3618 wait_for_completion(&vscsi->unconfig);
3620 vio_disable_interrupts(vdev);
3621 free_irq(vdev->irq, vscsi);
3622 destroy_workqueue(vscsi->work_q);
3623 dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
3625 kfree(vscsi->map_buf);
3626 tasklet_kill(&vscsi->work_task);
3627 ibmvscsis_destroy_command_q(vscsi);
3628 ibmvscsis_freetimer(vscsi);
3629 ibmvscsis_free_cmds(vscsi);
3630 srp_target_free(&vscsi->target);
3631 spin_lock_bh(&ibmvscsis_dev_lock);
3632 list_del(&vscsi->list);
3633 spin_unlock_bh(&ibmvscsis_dev_lock);
3639 static ssize_t system_id_show(struct device *dev,
3640 struct device_attribute *attr, char *buf)
3642 return snprintf(buf, PAGE_SIZE, "%s\n", system_id);
3645 static ssize_t partition_number_show(struct device *dev,
3646 struct device_attribute *attr, char *buf)
3648 return snprintf(buf, PAGE_SIZE, "%x\n", partition_number);
3651 static ssize_t unit_address_show(struct device *dev,
3652 struct device_attribute *attr, char *buf)
3654 struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev);
3656 return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address);
3659 static int ibmvscsis_get_system_info(void)
3661 struct device_node *rootdn, *vdevdn;
3662 const char *id, *model, *name;
3665 rootdn = of_find_node_by_path("/");
3669 model = of_get_property(rootdn, "model", NULL);
3670 id = of_get_property(rootdn, "system-id", NULL);
3672 snprintf(system_id, sizeof(system_id), "%s-%s", model, id);
3674 name = of_get_property(rootdn, "ibm,partition-name", NULL);
3676 strncpy(partition_name, name, sizeof(partition_name));
3678 num = of_get_property(rootdn, "ibm,partition-no", NULL);
3680 partition_number = of_read_number(num, 1);
3682 of_node_put(rootdn);
3684 vdevdn = of_find_node_by_path("/vdevice");
3688 mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size",
3691 max_vdma_size = *mvds;
3692 of_node_put(vdevdn);
3698 static char *ibmvscsis_get_fabric_name(void)
3703 static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg)
3705 struct ibmvscsis_tport *tport =
3706 container_of(se_tpg, struct ibmvscsis_tport, se_tpg);
3708 return tport->tport_name;
3711 static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg)
3713 struct ibmvscsis_tport *tport =
3714 container_of(se_tpg, struct ibmvscsis_tport, se_tpg);
3716 return tport->tport_tpgt;
3719 static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg)
3724 static int ibmvscsis_check_true(struct se_portal_group *se_tpg)
3729 static int ibmvscsis_check_false(struct se_portal_group *se_tpg)
3734 static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg)
3739 static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd)
3741 return target_put_sess_cmd(se_cmd);
3744 static void ibmvscsis_release_cmd(struct se_cmd *se_cmd)
3746 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3748 struct scsi_info *vscsi = cmd->adapter;
3750 spin_lock_bh(&vscsi->intr_lock);
3751 /* Remove from active_q */
3752 list_move_tail(&cmd->list, &vscsi->waiting_rsp);
3753 ibmvscsis_send_messages(vscsi);
3754 spin_unlock_bh(&vscsi->intr_lock);
3757 static u32 ibmvscsis_sess_get_index(struct se_session *se_sess)
3762 static int ibmvscsis_write_pending(struct se_cmd *se_cmd)
3764 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3766 struct scsi_info *vscsi = cmd->adapter;
3767 struct iu_entry *iue = cmd->iue;
3771 * If CLIENT_FAILED OR RESPONSE_Q_DOWN, then just return success
3772 * since LIO can't do anything about it, and we dont want to
3773 * attempt an srp_transfer_data.
3775 if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) {
3776 dev_err(&vscsi->dev, "write_pending failed since: %d\n",
3782 rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma,
3785 dev_err(&vscsi->dev, "srp_transfer_data() failed: %d\n", rc);
3789 * We now tell TCM to add this WRITE CDB directly into the TCM storage
3790 * object execution queue.
3792 target_execute_cmd(se_cmd);
3796 static int ibmvscsis_write_pending_status(struct se_cmd *se_cmd)
3801 static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl)
3805 static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd)
3810 static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd)
3812 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3814 struct iu_entry *iue = cmd->iue;
3815 struct scsi_info *vscsi = cmd->adapter;
3820 rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1,
3823 dev_err(&vscsi->dev, "srp_transfer_data failed: %d\n", rc);
3824 sd = se_cmd->sense_buffer;
3825 se_cmd->scsi_sense_length = 18;
3826 memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length);
3827 /* Logical Unit Communication Time-out asc/ascq = 0x0801 */
3828 scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR,
3832 srp_build_response(vscsi, cmd, &len);
3833 cmd->rsp.format = SRP_FORMAT;
3839 static int ibmvscsis_queue_status(struct se_cmd *se_cmd)
3841 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3843 struct scsi_info *vscsi = cmd->adapter;
3846 dev_dbg(&vscsi->dev, "queue_status %p\n", se_cmd);
3848 srp_build_response(vscsi, cmd, &len);
3849 cmd->rsp.format = SRP_FORMAT;
3855 static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd)
3857 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3859 struct scsi_info *vscsi = cmd->adapter;
3860 struct ibmvscsis_cmd *cmd_itr;
3861 struct iu_entry *iue = iue = cmd->iue;
3862 struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
3863 u64 tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
3866 dev_dbg(&vscsi->dev, "queue_tm_rsp %p, status %d\n",
3867 se_cmd, (int)se_cmd->se_tmr_req->response);
3869 if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK &&
3870 cmd->se_cmd.se_tmr_req->response == TMR_TASK_DOES_NOT_EXIST) {
3871 spin_lock_bh(&vscsi->intr_lock);
3872 list_for_each_entry(cmd_itr, &vscsi->active_q, list) {
3873 if (tag_to_abort == cmd_itr->se_cmd.tag) {
3874 cmd_itr->abort_cmd = cmd;
3875 cmd->flags |= DELAY_SEND;
3879 spin_unlock_bh(&vscsi->intr_lock);
3882 srp_build_response(vscsi, cmd, &len);
3883 cmd->rsp.format = SRP_FORMAT;
3887 static void ibmvscsis_aborted_task(struct se_cmd *se_cmd)
3889 struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3891 struct scsi_info *vscsi = cmd->adapter;
3893 dev_dbg(&vscsi->dev, "ibmvscsis_aborted_task %p task_tag: %llu\n",
3894 se_cmd, se_cmd->tag);
3897 static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf,
3898 struct config_group *group,
3901 struct ibmvscsis_tport *tport;
3902 struct scsi_info *vscsi;
3904 tport = ibmvscsis_lookup_port(name);
3906 vscsi = container_of(tport, struct scsi_info, tport);
3907 tport->tport_proto_id = SCSI_PROTOCOL_SRP;
3908 dev_dbg(&vscsi->dev, "make_tport(%s), pointer:%p, tport_id:%x\n",
3909 name, tport, tport->tport_proto_id);
3910 return &tport->tport_wwn;
3913 return ERR_PTR(-EINVAL);
3916 static void ibmvscsis_drop_tport(struct se_wwn *wwn)
3918 struct ibmvscsis_tport *tport = container_of(wwn,
3919 struct ibmvscsis_tport,
3921 struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
3923 dev_dbg(&vscsi->dev, "drop_tport(%s)\n",
3924 config_item_name(&tport->tport_wwn.wwn_group.cg_item));
3927 static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn,
3930 struct ibmvscsis_tport *tport =
3931 container_of(wwn, struct ibmvscsis_tport, tport_wwn);
3935 if (strstr(name, "tpgt_") != name)
3936 return ERR_PTR(-EINVAL);
3937 rc = kstrtou16(name + 5, 0, &tpgt);
3940 tport->tport_tpgt = tpgt;
3942 tport->releasing = false;
3944 rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg,
3945 tport->tport_proto_id);
3949 return &tport->se_tpg;
3952 static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg)
3954 struct ibmvscsis_tport *tport = container_of(se_tpg,
3955 struct ibmvscsis_tport,
3958 tport->releasing = true;
3959 tport->enabled = false;
3962 * Release the virtual I_T Nexus for this ibmvscsis TPG
3964 ibmvscsis_drop_nexus(tport);
3966 * Deregister the se_tpg from TCM..
3968 core_tpg_deregister(se_tpg);
3971 static ssize_t ibmvscsis_wwn_version_show(struct config_item *item,
3974 return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION);
3976 CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version);
3978 static struct configfs_attribute *ibmvscsis_wwn_attrs[] = {
3979 &ibmvscsis_wwn_attr_version,
3983 static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item,
3986 struct se_portal_group *se_tpg = to_tpg(item);
3987 struct ibmvscsis_tport *tport = container_of(se_tpg,
3988 struct ibmvscsis_tport,
3991 return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0);
3994 static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item,
3995 const char *page, size_t count)
3997 struct se_portal_group *se_tpg = to_tpg(item);
3998 struct ibmvscsis_tport *tport = container_of(se_tpg,
3999 struct ibmvscsis_tport,
4001 struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
4006 rc = kstrtoul(page, 0, &tmp);
4008 dev_err(&vscsi->dev, "Unable to extract srpt_tpg_store_enable\n");
4012 if ((tmp != 0) && (tmp != 1)) {
4013 dev_err(&vscsi->dev, "Illegal value for srpt_tpg_store_enable\n");
4018 spin_lock_bh(&vscsi->intr_lock);
4019 tport->enabled = true;
4020 lrc = ibmvscsis_enable_change_state(vscsi);
4022 dev_err(&vscsi->dev, "enable_change_state failed, rc %ld state %d\n",
4024 spin_unlock_bh(&vscsi->intr_lock);
4026 spin_lock_bh(&vscsi->intr_lock);
4027 tport->enabled = false;
4028 /* This simulates the server going down */
4029 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
4030 spin_unlock_bh(&vscsi->intr_lock);
4033 dev_dbg(&vscsi->dev, "tpg_enable_store, tmp %ld, state %d\n", tmp,
4038 CONFIGFS_ATTR(ibmvscsis_tpg_, enable);
4040 static struct configfs_attribute *ibmvscsis_tpg_attrs[] = {
4041 &ibmvscsis_tpg_attr_enable,
4045 static const struct target_core_fabric_ops ibmvscsis_ops = {
4046 .module = THIS_MODULE,
4047 .name = "ibmvscsis",
4048 .max_data_sg_nents = MAX_TXU / PAGE_SIZE,
4049 .get_fabric_name = ibmvscsis_get_fabric_name,
4050 .tpg_get_wwn = ibmvscsis_get_fabric_wwn,
4051 .tpg_get_tag = ibmvscsis_get_tag,
4052 .tpg_get_default_depth = ibmvscsis_get_default_depth,
4053 .tpg_check_demo_mode = ibmvscsis_check_true,
4054 .tpg_check_demo_mode_cache = ibmvscsis_check_true,
4055 .tpg_check_demo_mode_write_protect = ibmvscsis_check_false,
4056 .tpg_check_prod_mode_write_protect = ibmvscsis_check_false,
4057 .tpg_get_inst_index = ibmvscsis_tpg_get_inst_index,
4058 .check_stop_free = ibmvscsis_check_stop_free,
4059 .release_cmd = ibmvscsis_release_cmd,
4060 .sess_get_index = ibmvscsis_sess_get_index,
4061 .write_pending = ibmvscsis_write_pending,
4062 .write_pending_status = ibmvscsis_write_pending_status,
4063 .set_default_node_attributes = ibmvscsis_set_default_node_attrs,
4064 .get_cmd_state = ibmvscsis_get_cmd_state,
4065 .queue_data_in = ibmvscsis_queue_data_in,
4066 .queue_status = ibmvscsis_queue_status,
4067 .queue_tm_rsp = ibmvscsis_queue_tm_rsp,
4068 .aborted_task = ibmvscsis_aborted_task,
4070 * Setup function pointers for logic in target_core_fabric_configfs.c
4072 .fabric_make_wwn = ibmvscsis_make_tport,
4073 .fabric_drop_wwn = ibmvscsis_drop_tport,
4074 .fabric_make_tpg = ibmvscsis_make_tpg,
4075 .fabric_drop_tpg = ibmvscsis_drop_tpg,
4077 .tfc_wwn_attrs = ibmvscsis_wwn_attrs,
4078 .tfc_tpg_base_attrs = ibmvscsis_tpg_attrs,
4081 static void ibmvscsis_dev_release(struct device *dev) {};
4083 static struct device_attribute dev_attr_system_id =
4084 __ATTR(system_id, S_IRUGO, system_id_show, NULL);
4086 static struct device_attribute dev_attr_partition_number =
4087 __ATTR(partition_number, S_IRUGO, partition_number_show, NULL);
4089 static struct device_attribute dev_attr_unit_address =
4090 __ATTR(unit_address, S_IRUGO, unit_address_show, NULL);
4092 static struct attribute *ibmvscsis_dev_attrs[] = {
4093 &dev_attr_system_id.attr,
4094 &dev_attr_partition_number.attr,
4095 &dev_attr_unit_address.attr,
4097 ATTRIBUTE_GROUPS(ibmvscsis_dev);
4099 static struct class ibmvscsis_class = {
4100 .name = "ibmvscsis",
4101 .dev_release = ibmvscsis_dev_release,
4102 .dev_groups = ibmvscsis_dev_groups,
4105 static const struct vio_device_id ibmvscsis_device_table[] = {
4106 { "v-scsi-host", "IBM,v-scsi-host" },
4109 MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table);
4111 static struct vio_driver ibmvscsis_driver = {
4112 .name = "ibmvscsis",
4113 .id_table = ibmvscsis_device_table,
4114 .probe = ibmvscsis_probe,
4115 .remove = ibmvscsis_remove,
4119 * ibmvscsis_init() - Kernel Module initialization
4121 * Note: vio_register_driver() registers callback functions, and at least one
4122 * of those callback functions calls TCM - Linux IO Target Subsystem, thus
4123 * the SCSI Target template must be registered before vio_register_driver()
4126 static int __init ibmvscsis_init(void)
4130 rc = ibmvscsis_get_system_info();
4132 pr_err("rc %d from get_system_info\n", rc);
4136 rc = class_register(&ibmvscsis_class);
4138 pr_err("failed class register\n");
4142 rc = target_register_template(&ibmvscsis_ops);
4144 pr_err("rc %d from target_register_template\n", rc);
4145 goto unregister_class;
4148 rc = vio_register_driver(&ibmvscsis_driver);
4150 pr_err("rc %d from vio_register_driver\n", rc);
4151 goto unregister_target;
4157 target_unregister_template(&ibmvscsis_ops);
4159 class_unregister(&ibmvscsis_class);
4164 static void __exit ibmvscsis_exit(void)
4166 pr_info("Unregister IBM virtual SCSI host driver\n");
4167 vio_unregister_driver(&ibmvscsis_driver);
4168 target_unregister_template(&ibmvscsis_ops);
4169 class_unregister(&ibmvscsis_class);
4172 MODULE_DESCRIPTION("IBMVSCSIS fabric driver");
4173 MODULE_AUTHOR("Bryant G. Ly and Michael Cyr");
4174 MODULE_LICENSE("GPL");
4175 MODULE_VERSION(IBMVSCSIS_VERSION);
4176 module_init(ibmvscsis_init);
4177 module_exit(ibmvscsis_exit);