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1// SPDX-License-Identifier: GPL-2.0-or-later2/* ------------------------------------------------------------3 * ibmvscsi.c4 * (C) Copyright IBM Corporation 1994, 20045 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)6 * Santiago Leon (santil@us.ibm.com)7 * Dave Boutcher (sleddog@us.ibm.com)8 *9 * ------------------------------------------------------------10 * Emulation of a SCSI host adapter for Virtual I/O devices11 *12 * This driver supports the SCSI adapter implemented by the IBM13 * Power5 firmware. That SCSI adapter is not a physical adapter,14 * but allows Linux SCSI peripheral drivers to directly15 * access devices in another logical partition on the physical system.16 *17 * The virtual adapter(s) are present in the open firmware device18 * tree just like real adapters.19 *20 * One of the capabilities provided on these systems is the ability21 * to DMA between partitions. The architecture states that for VSCSI,22 * the server side is allowed to DMA to and from the client. The client23 * is never trusted to DMA to or from the server directly.24 *25 * Messages are sent between partitions on a "Command/Response Queue" 26 * (CRQ), which is just a buffer of 16 byte entries in the receiver's 27 * Senders cannot access the buffer directly, but send messages by28 * making a hypervisor call and passing in the 16 bytes. The hypervisor29 * puts the message in the next 16 byte space in round-robin fashion,30 * turns on the high order bit of the message (the valid bit), and 31 * generates an interrupt to the receiver (if interrupts are turned on.) 32 * The receiver just turns off the valid bit when they have copied out33 * the message.34 *35 * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit36 * (IU) (as defined in the T10 standard available at www.t10.org), gets 37 * a DMA address for the message, and sends it to the server as the38 * payload of a CRQ message. The server DMAs the SRP IU and processes it,39 * including doing any additional data transfers. When it is done, it40 * DMAs the SRP response back to the same address as the request came from,41 * and sends a CRQ message back to inform the client that the request has42 * completed.43 *44 * TODO: This is currently pretty tied to the IBM pSeries hypervisor45 * interfaces. It would be really nice to abstract this above an RDMA46 * layer.47 */48 49#include <linux/module.h>50#include <linux/moduleparam.h>51#include <linux/dma-mapping.h>52#include <linux/delay.h>53#include <linux/slab.h>54#include <linux/of.h>55#include <linux/pm.h>56#include <linux/kthread.h>57#include <asm/firmware.h>58#include <asm/vio.h>59#include <scsi/scsi.h>60#include <scsi/scsi_cmnd.h>61#include <scsi/scsi_host.h>62#include <scsi/scsi_device.h>63#include <scsi/scsi_transport_srp.h>64#include "ibmvscsi.h"65 66/* The values below are somewhat arbitrary default values, but 67 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)68 * Note that there are 3 bits of channel value, 6 bits of id, and69 * 5 bits of LUN.70 */71static int max_id = 64;72static int max_channel = 3;73static int init_timeout = 300;74static int login_timeout = 60;75static int info_timeout = 30;76static int abort_timeout = 60;77static int reset_timeout = 60;78static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;79static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;80static int fast_fail = 1;81static int client_reserve = 1;82static char partition_name[96] = "UNKNOWN";83static unsigned int partition_number = -1;84static LIST_HEAD(ibmvscsi_head);85static DEFINE_SPINLOCK(ibmvscsi_driver_lock);86 87static struct scsi_transport_template *ibmvscsi_transport_template;88 89#define IBMVSCSI_VERSION "1.5.9"90 91MODULE_DESCRIPTION("IBM Virtual SCSI");92MODULE_AUTHOR("Dave Boutcher");93MODULE_LICENSE("GPL");94MODULE_VERSION(IBMVSCSI_VERSION);95 96module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);97MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]");98module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);99MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]");100module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);101MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");102module_param_named(max_requests, max_requests, int, S_IRUGO);103MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");104module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);105MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");106module_param_named(client_reserve, client_reserve, int, S_IRUGO );107MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");108 109static void ibmvscsi_handle_crq(struct viosrp_crq *crq,110 struct ibmvscsi_host_data *hostdata);111 112/* ------------------------------------------------------------113 * Routines for managing the command/response queue114 */115/**116 * ibmvscsi_handle_event: - Interrupt handler for crq events117 * @irq: number of irq to handle, not used118 * @dev_instance: ibmvscsi_host_data of host that received interrupt119 *120 * Disables interrupts and schedules srp_task121 * Always returns IRQ_HANDLED122 */123static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)124{125 struct ibmvscsi_host_data *hostdata =126 (struct ibmvscsi_host_data *)dev_instance;127 vio_disable_interrupts(to_vio_dev(hostdata->dev));128 tasklet_schedule(&hostdata->srp_task);129 return IRQ_HANDLED;130}131 132/**133 * ibmvscsi_release_crq_queue() - Deallocates data and unregisters CRQ134 * @queue: crq_queue to initialize and register135 * @hostdata: ibmvscsi_host_data of host136 * @max_requests: maximum requests (unused)137 *138 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters139 * the crq with the hypervisor.140 */141static void ibmvscsi_release_crq_queue(struct crq_queue *queue,142 struct ibmvscsi_host_data *hostdata,143 int max_requests)144{145 long rc = 0;146 struct vio_dev *vdev = to_vio_dev(hostdata->dev);147 free_irq(vdev->irq, (void *)hostdata);148 tasklet_kill(&hostdata->srp_task);149 do {150 if (rc)151 msleep(100);152 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);153 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));154 dma_unmap_single(hostdata->dev,155 queue->msg_token,156 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);157 free_page((unsigned long)queue->msgs);158}159 160/**161 * crq_queue_next_crq: - Returns the next entry in message queue162 * @queue: crq_queue to use163 *164 * Returns pointer to next entry in queue, or NULL if there are no new165 * entried in the CRQ.166 */167static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)168{169 struct viosrp_crq *crq;170 unsigned long flags;171 172 spin_lock_irqsave(&queue->lock, flags);173 crq = &queue->msgs[queue->cur];174 if (crq->valid != VIOSRP_CRQ_FREE) {175 if (++queue->cur == queue->size)176 queue->cur = 0;177 178 /* Ensure the read of the valid bit occurs before reading any179 * other bits of the CRQ entry180 */181 rmb();182 } else183 crq = NULL;184 spin_unlock_irqrestore(&queue->lock, flags);185 186 return crq;187}188 189/**190 * ibmvscsi_send_crq: - Send a CRQ191 * @hostdata: the adapter192 * @word1: the first 64 bits of the data193 * @word2: the second 64 bits of the data194 */195static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,196 u64 word1, u64 word2)197{198 struct vio_dev *vdev = to_vio_dev(hostdata->dev);199 200 /*201 * Ensure the command buffer is flushed to memory before handing it202 * over to the VIOS to prevent it from fetching any stale data.203 */204 mb();205 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);206}207 208/**209 * ibmvscsi_task: - Process srps asynchronously210 * @data: ibmvscsi_host_data of host211 */212static void ibmvscsi_task(void *data)213{214 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;215 struct vio_dev *vdev = to_vio_dev(hostdata->dev);216 struct viosrp_crq *crq;217 int done = 0;218 219 while (!done) {220 /* Pull all the valid messages off the CRQ */221 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {222 ibmvscsi_handle_crq(crq, hostdata);223 crq->valid = VIOSRP_CRQ_FREE;224 wmb();225 }226 227 vio_enable_interrupts(vdev);228 crq = crq_queue_next_crq(&hostdata->queue);229 if (crq != NULL) {230 vio_disable_interrupts(vdev);231 ibmvscsi_handle_crq(crq, hostdata);232 crq->valid = VIOSRP_CRQ_FREE;233 wmb();234 } else {235 done = 1;236 }237 }238}239 240static void gather_partition_info(void)241{242 const char *ppartition_name;243 const __be32 *p_number_ptr;244 245 /* Retrieve information about this partition */246 if (!of_root)247 return;248 249 of_node_get(of_root);250 251 ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);252 if (ppartition_name)253 strscpy(partition_name, ppartition_name,254 sizeof(partition_name));255 p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);256 if (p_number_ptr)257 partition_number = of_read_number(p_number_ptr, 1);258 of_node_put(of_root);259}260 261static void set_adapter_info(struct ibmvscsi_host_data *hostdata)262{263 memset(&hostdata->madapter_info, 0x00,264 sizeof(hostdata->madapter_info));265 266 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);267 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);268 269 strscpy(hostdata->madapter_info.partition_name, partition_name,270 sizeof(hostdata->madapter_info.partition_name));271 272 hostdata->madapter_info.partition_number =273 cpu_to_be32(partition_number);274 275 hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);276 hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);277}278 279/**280 * ibmvscsi_reset_crq_queue() - resets a crq after a failure281 * @queue: crq_queue to initialize and register282 * @hostdata: ibmvscsi_host_data of host283 */284static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,285 struct ibmvscsi_host_data *hostdata)286{287 int rc = 0;288 struct vio_dev *vdev = to_vio_dev(hostdata->dev);289 290 /* Close the CRQ */291 do {292 if (rc)293 msleep(100);294 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);295 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));296 297 /* Clean out the queue */298 memset(queue->msgs, 0x00, PAGE_SIZE);299 queue->cur = 0;300 301 set_adapter_info(hostdata);302 303 /* And re-open it again */304 rc = plpar_hcall_norets(H_REG_CRQ,305 vdev->unit_address,306 queue->msg_token, PAGE_SIZE);307 if (rc == H_CLOSED) {308 /* Adapter is good, but other end is not ready */309 dev_warn(hostdata->dev, "Partner adapter not ready\n");310 } else if (rc != 0) {311 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);312 }313 return rc;314}315 316/**317 * ibmvscsi_init_crq_queue() - Initializes and registers CRQ with hypervisor318 * @queue: crq_queue to initialize and register319 * @hostdata: ibmvscsi_host_data of host320 * @max_requests: maximum requests (unused)321 *322 * Allocates a page for messages, maps it for dma, and registers323 * the crq with the hypervisor.324 * Returns zero on success.325 */326static int ibmvscsi_init_crq_queue(struct crq_queue *queue,327 struct ibmvscsi_host_data *hostdata,328 int max_requests)329{330 int rc;331 int retrc;332 struct vio_dev *vdev = to_vio_dev(hostdata->dev);333 334 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);335 336 if (!queue->msgs)337 goto malloc_failed;338 queue->size = PAGE_SIZE / sizeof(*queue->msgs);339 340 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,341 queue->size * sizeof(*queue->msgs),342 DMA_BIDIRECTIONAL);343 344 if (dma_mapping_error(hostdata->dev, queue->msg_token))345 goto map_failed;346 347 gather_partition_info();348 set_adapter_info(hostdata);349 350 retrc = rc = plpar_hcall_norets(H_REG_CRQ,351 vdev->unit_address,352 queue->msg_token, PAGE_SIZE);353 if (rc == H_RESOURCE)354 /* maybe kexecing and resource is busy. try a reset */355 rc = ibmvscsi_reset_crq_queue(queue,356 hostdata);357 358 if (rc == H_CLOSED) {359 /* Adapter is good, but other end is not ready */360 dev_warn(hostdata->dev, "Partner adapter not ready\n");361 retrc = 0;362 } else if (rc != 0) {363 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);364 goto reg_crq_failed;365 }366 367 queue->cur = 0;368 spin_lock_init(&queue->lock);369 370 tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,371 (unsigned long)hostdata);372 373 if (request_irq(vdev->irq,374 ibmvscsi_handle_event,375 0, "ibmvscsi", (void *)hostdata) != 0) {376 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",377 vdev->irq);378 goto req_irq_failed;379 }380 381 rc = vio_enable_interrupts(vdev);382 if (rc != 0) {383 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);384 goto req_irq_failed;385 }386 387 return retrc;388 389 req_irq_failed:390 tasklet_kill(&hostdata->srp_task);391 rc = 0;392 do {393 if (rc)394 msleep(100);395 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);396 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));397 reg_crq_failed:398 dma_unmap_single(hostdata->dev,399 queue->msg_token,400 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);401 map_failed:402 free_page((unsigned long)queue->msgs);403 malloc_failed:404 return -1;405}406 407/**408 * ibmvscsi_reenable_crq_queue() - reenables a crq after409 * @queue: crq_queue to initialize and register410 * @hostdata: ibmvscsi_host_data of host411 */412static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,413 struct ibmvscsi_host_data *hostdata)414{415 int rc = 0;416 struct vio_dev *vdev = to_vio_dev(hostdata->dev);417 418 set_adapter_info(hostdata);419 420 /* Re-enable the CRQ */421 do {422 if (rc)423 msleep(100);424 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);425 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));426 427 if (rc)428 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);429 return rc;430}431 432/* ------------------------------------------------------------433 * Routines for the event pool and event structs434 */435/**436 * initialize_event_pool: - Allocates and initializes the event pool for a host437 * @pool: event_pool to be initialized438 * @size: Number of events in pool439 * @hostdata: ibmvscsi_host_data who owns the event pool440 *441 * Returns zero on success.442 */443static int initialize_event_pool(struct event_pool *pool,444 int size, struct ibmvscsi_host_data *hostdata)445{446 int i;447 448 pool->size = size;449 pool->next = 0;450 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);451 if (!pool->events)452 return -ENOMEM;453 454 pool->iu_storage =455 dma_alloc_coherent(hostdata->dev,456 pool->size * sizeof(*pool->iu_storage),457 &pool->iu_token, GFP_KERNEL);458 if (!pool->iu_storage) {459 kfree(pool->events);460 return -ENOMEM;461 }462 463 for (i = 0; i < pool->size; ++i) {464 struct srp_event_struct *evt = &pool->events[i];465 memset(&evt->crq, 0x00, sizeof(evt->crq));466 atomic_set(&evt->free, 1);467 evt->crq.valid = VIOSRP_CRQ_CMD_RSP;468 evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));469 evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +470 sizeof(*evt->xfer_iu) * i);471 evt->xfer_iu = pool->iu_storage + i;472 evt->hostdata = hostdata;473 evt->ext_list = NULL;474 evt->ext_list_token = 0;475 }476 477 return 0;478}479 480/**481 * release_event_pool() - Frees memory of an event pool of a host482 * @pool: event_pool to be released483 * @hostdata: ibmvscsi_host_data who owns the even pool484 *485 * Returns zero on success.486 */487static void release_event_pool(struct event_pool *pool,488 struct ibmvscsi_host_data *hostdata)489{490 int i, in_use = 0;491 for (i = 0; i < pool->size; ++i) {492 if (atomic_read(&pool->events[i].free) != 1)493 ++in_use;494 if (pool->events[i].ext_list) {495 dma_free_coherent(hostdata->dev,496 SG_ALL * sizeof(struct srp_direct_buf),497 pool->events[i].ext_list,498 pool->events[i].ext_list_token);499 }500 }501 if (in_use)502 dev_warn(hostdata->dev, "releasing event pool with %d "503 "events still in use?\n", in_use);504 kfree(pool->events);505 dma_free_coherent(hostdata->dev,506 pool->size * sizeof(*pool->iu_storage),507 pool->iu_storage, pool->iu_token);508}509 510/**511 * valid_event_struct: - Determines if event is valid.512 * @pool: event_pool that contains the event513 * @evt: srp_event_struct to be checked for validity514 *515 * Returns zero if event is invalid, one otherwise.516*/517static int valid_event_struct(struct event_pool *pool,518 struct srp_event_struct *evt)519{520 int index = evt - pool->events;521 if (index < 0 || index >= pool->size) /* outside of bounds */522 return 0;523 if (evt != pool->events + index) /* unaligned */524 return 0;525 return 1;526}527 528/**529 * free_event_struct() - Changes status of event to "free"530 * @pool: event_pool that contains the event531 * @evt: srp_event_struct to be modified532 */533static void free_event_struct(struct event_pool *pool,534 struct srp_event_struct *evt)535{536 if (!valid_event_struct(pool, evt)) {537 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "538 "(not in pool %p)\n", evt, pool->events);539 return;540 }541 if (atomic_inc_return(&evt->free) != 1) {542 dev_err(evt->hostdata->dev, "Freeing event_struct %p "543 "which is not in use!\n", evt);544 return;545 }546}547 548/**549 * get_event_struct() - Gets the next free event in pool550 * @pool: event_pool that contains the events to be searched551 *552 * Returns the next event in "free" state, and NULL if none are free.553 * Note that no synchronization is done here, we assume the host_lock554 * will syncrhonze things.555*/556static struct srp_event_struct *get_event_struct(struct event_pool *pool)557{558 int i;559 int poolsize = pool->size;560 int offset = pool->next;561 562 for (i = 0; i < poolsize; i++) {563 offset = (offset + 1) % poolsize;564 if (!atomic_dec_if_positive(&pool->events[offset].free)) {565 pool->next = offset;566 return &pool->events[offset];567 }568 }569 570 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");571 return NULL;572}573 574/**575 * init_event_struct: Initialize fields in an event struct that are always 576 * required.577 * @evt_struct: The event578 * @done: Routine to call when the event is responded to579 * @format: SRP or MAD format580 * @timeout: timeout value set in the CRQ581 */582static void init_event_struct(struct srp_event_struct *evt_struct,583 void (*done) (struct srp_event_struct *),584 u8 format,585 int timeout)586{587 evt_struct->cmnd = NULL;588 evt_struct->cmnd_done = NULL;589 evt_struct->sync_srp = NULL;590 evt_struct->crq.format = format;591 evt_struct->crq.timeout = cpu_to_be16(timeout);592 evt_struct->done = done;593}594 595/* ------------------------------------------------------------596 * Routines for receiving SCSI responses from the hosting partition597 */598 599/*600 * set_srp_direction: Set the fields in the srp related to data601 * direction and number of buffers based on the direction in602 * the scsi_cmnd and the number of buffers603 */604static void set_srp_direction(struct scsi_cmnd *cmd,605 struct srp_cmd *srp_cmd, 606 int numbuf)607{608 u8 fmt;609 610 if (numbuf == 0)611 return;612 613 if (numbuf == 1)614 fmt = SRP_DATA_DESC_DIRECT;615 else {616 fmt = SRP_DATA_DESC_INDIRECT;617 numbuf = min(numbuf, MAX_INDIRECT_BUFS);618 619 if (cmd->sc_data_direction == DMA_TO_DEVICE)620 srp_cmd->data_out_desc_cnt = numbuf;621 else622 srp_cmd->data_in_desc_cnt = numbuf;623 }624 625 if (cmd->sc_data_direction == DMA_TO_DEVICE)626 srp_cmd->buf_fmt = fmt << 4;627 else628 srp_cmd->buf_fmt = fmt;629}630 631/**632 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format633 * @cmd: srp_cmd whose additional_data member will be unmapped634 * @evt_struct: the event635 * @dev: device for which the memory is mapped636 */637static void unmap_cmd_data(struct srp_cmd *cmd,638 struct srp_event_struct *evt_struct,639 struct device *dev)640{641 u8 out_fmt, in_fmt;642 643 out_fmt = cmd->buf_fmt >> 4;644 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);645 646 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)647 return;648 649 if (evt_struct->cmnd)650 scsi_dma_unmap(evt_struct->cmnd);651}652 653static int map_sg_list(struct scsi_cmnd *cmd, int nseg,654 struct srp_direct_buf *md)655{656 int i;657 struct scatterlist *sg;658 u64 total_length = 0;659 660 scsi_for_each_sg(cmd, sg, nseg, i) {661 struct srp_direct_buf *descr = md + i;662 descr->va = cpu_to_be64(sg_dma_address(sg));663 descr->len = cpu_to_be32(sg_dma_len(sg));664 descr->key = 0;665 total_length += sg_dma_len(sg);666 }667 return total_length;668}669 670/**671 * map_sg_data: - Maps dma for a scatterlist and initializes descriptor fields672 * @cmd: struct scsi_cmnd with the scatterlist673 * @evt_struct: struct srp_event_struct to map674 * @srp_cmd: srp_cmd that contains the memory descriptor675 * @dev: device for which to map dma memory676 *677 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.678 * Returns 1 on success.679*/680static int map_sg_data(struct scsi_cmnd *cmd,681 struct srp_event_struct *evt_struct,682 struct srp_cmd *srp_cmd, struct device *dev)683{684 685 int sg_mapped;686 u64 total_length = 0;687 struct srp_direct_buf *data =688 (struct srp_direct_buf *) srp_cmd->add_data;689 struct srp_indirect_buf *indirect =690 (struct srp_indirect_buf *) data;691 692 sg_mapped = scsi_dma_map(cmd);693 if (!sg_mapped)694 return 1;695 else if (sg_mapped < 0)696 return 0;697 698 set_srp_direction(cmd, srp_cmd, sg_mapped);699 700 /* special case; we can use a single direct descriptor */701 if (sg_mapped == 1) {702 map_sg_list(cmd, sg_mapped, data);703 return 1;704 }705 706 indirect->table_desc.va = 0;707 indirect->table_desc.len = cpu_to_be32(sg_mapped *708 sizeof(struct srp_direct_buf));709 indirect->table_desc.key = 0;710 711 if (sg_mapped <= MAX_INDIRECT_BUFS) {712 total_length = map_sg_list(cmd, sg_mapped,713 &indirect->desc_list[0]);714 indirect->len = cpu_to_be32(total_length);715 return 1;716 }717 718 /* get indirect table */719 if (!evt_struct->ext_list) {720 evt_struct->ext_list = dma_alloc_coherent(dev,721 SG_ALL * sizeof(struct srp_direct_buf),722 &evt_struct->ext_list_token, 0);723 if (!evt_struct->ext_list) {724 if (!firmware_has_feature(FW_FEATURE_CMO))725 sdev_printk(KERN_ERR, cmd->device,726 "Can't allocate memory "727 "for indirect table\n");728 scsi_dma_unmap(cmd);729 return 0;730 }731 }732 733 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);734 735 indirect->len = cpu_to_be32(total_length);736 indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);737 indirect->table_desc.len = cpu_to_be32(sg_mapped *738 sizeof(indirect->desc_list[0]));739 memcpy(indirect->desc_list, evt_struct->ext_list,740 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));741 return 1;742}743 744/**745 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds746 * @cmd: struct scsi_cmnd with the memory to be mapped747 * @evt_struct: struct srp_event_struct to map748 * @srp_cmd: srp_cmd that contains the memory descriptor749 * @dev: dma device for which to map dma memory750 *751 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds 752 * Returns 1 on success.753*/754static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,755 struct srp_event_struct *evt_struct,756 struct srp_cmd *srp_cmd, struct device *dev)757{758 switch (cmd->sc_data_direction) {759 case DMA_FROM_DEVICE:760 case DMA_TO_DEVICE:761 break;762 case DMA_NONE:763 return 1;764 case DMA_BIDIRECTIONAL:765 sdev_printk(KERN_ERR, cmd->device,766 "Can't map DMA_BIDIRECTIONAL to read/write\n");767 return 0;768 default:769 sdev_printk(KERN_ERR, cmd->device,770 "Unknown data direction 0x%02x; can't map!\n",771 cmd->sc_data_direction);772 return 0;773 }774 775 return map_sg_data(cmd, evt_struct, srp_cmd, dev);776}777 778/**779 * purge_requests: Our virtual adapter just shut down. purge any sent requests780 * @hostdata: the adapter781 * @error_code: error code to return as the 'result'782 */783static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)784{785 struct srp_event_struct *evt;786 unsigned long flags;787 788 spin_lock_irqsave(hostdata->host->host_lock, flags);789 while (!list_empty(&hostdata->sent)) {790 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);791 list_del(&evt->list);792 del_timer(&evt->timer);793 794 spin_unlock_irqrestore(hostdata->host->host_lock, flags);795 if (evt->cmnd) {796 evt->cmnd->result = (error_code << 16);797 unmap_cmd_data(&evt->iu.srp.cmd, evt,798 evt->hostdata->dev);799 if (evt->cmnd_done)800 evt->cmnd_done(evt->cmnd);801 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&802 evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)803 evt->done(evt);804 free_event_struct(&evt->hostdata->pool, evt);805 spin_lock_irqsave(hostdata->host->host_lock, flags);806 }807 spin_unlock_irqrestore(hostdata->host->host_lock, flags);808}809 810/**811 * ibmvscsi_set_request_limit - Set the adapter request_limit in response to812 * an adapter failure, reset, or SRP Login. Done under host lock to prevent813 * race with SCSI command submission.814 * @hostdata: adapter to adjust815 * @limit: new request limit816 */817static void ibmvscsi_set_request_limit(struct ibmvscsi_host_data *hostdata, int limit)818{819 unsigned long flags;820 821 spin_lock_irqsave(hostdata->host->host_lock, flags);822 atomic_set(&hostdata->request_limit, limit);823 spin_unlock_irqrestore(hostdata->host->host_lock, flags);824}825 826/**827 * ibmvscsi_reset_host - Reset the connection to the server828 * @hostdata: struct ibmvscsi_host_data to reset829*/830static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)831{832 scsi_block_requests(hostdata->host);833 ibmvscsi_set_request_limit(hostdata, 0);834 835 purge_requests(hostdata, DID_ERROR);836 hostdata->action = IBMVSCSI_HOST_ACTION_RESET;837 wake_up(&hostdata->work_wait_q);838}839 840/**841 * ibmvscsi_timeout - Internal command timeout handler842 * @t: struct srp_event_struct that timed out843 *844 * Called when an internally generated command times out845*/846static void ibmvscsi_timeout(struct timer_list *t)847{848 struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer);849 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;850 851 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",852 evt_struct->iu.srp.cmd.opcode);853 854 ibmvscsi_reset_host(hostdata);855}856 857 858/* ------------------------------------------------------------859 * Routines for sending and receiving SRPs860 */861/**862 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()863 * @evt_struct: evt_struct to be sent864 * @hostdata: ibmvscsi_host_data of host865 * @timeout: timeout in seconds - 0 means do not time command866 *867 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)868 * Note that this routine assumes that host_lock is held for synchronization869*/870static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,871 struct ibmvscsi_host_data *hostdata,872 unsigned long timeout)873{874 __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;875 int request_status = 0;876 int rc;877 int srp_req = 0;878 879 /* If we have exhausted our request limit, just fail this request,880 * unless it is for a reset or abort.881 * Note that there are rare cases involving driver generated requests 882 * (such as task management requests) that the mid layer may think we883 * can handle more requests (can_queue) when we actually can't884 */885 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {886 srp_req = 1;887 request_status =888 atomic_dec_if_positive(&hostdata->request_limit);889 /* If request limit was -1 when we started, it is now even890 * less than that891 */892 if (request_status < -1)893 goto send_error;894 /* Otherwise, we may have run out of requests. */895 /* If request limit was 0 when we started the adapter is in the896 * process of performing a login with the server adapter, or897 * we may have run out of requests.898 */899 else if (request_status == -1 &&900 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)901 goto send_busy;902 /* Abort and reset calls should make it through.903 * Nothing except abort and reset should use the last two904 * slots unless we had two or less to begin with.905 */906 else if (request_status < 2 &&907 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {908 /* In the case that we have less than two requests909 * available, check the server limit as a combination910 * of the request limit and the number of requests911 * in-flight (the size of the send list). If the912 * server limit is greater than 2, return busy so913 * that the last two are reserved for reset and abort.914 */915 int server_limit = request_status;916 struct srp_event_struct *tmp_evt;917 918 list_for_each_entry(tmp_evt, &hostdata->sent, list) {919 server_limit++;920 }921 922 if (server_limit > 2)923 goto send_busy;924 }925 }926 927 /* Copy the IU into the transfer area */928 *evt_struct->xfer_iu = evt_struct->iu;929 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;930 931 /* Add this to the sent list. We need to do this 932 * before we actually send 933 * in case it comes back REALLY fast934 */935 list_add_tail(&evt_struct->list, &hostdata->sent);936 937 timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0);938 if (timeout) {939 evt_struct->timer.expires = jiffies + (timeout * HZ);940 add_timer(&evt_struct->timer);941 }942 943 rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),944 be64_to_cpu(crq_as_u64[1]));945 if (rc != 0) {946 list_del(&evt_struct->list);947 del_timer(&evt_struct->timer);948 949 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.950 * Firmware will send a CRQ with a transport event (0xFF) to951 * tell this client what has happened to the transport. This952 * will be handled in ibmvscsi_handle_crq()953 */954 if (rc == H_CLOSED) {955 dev_warn(hostdata->dev, "send warning. "956 "Receive queue closed, will retry.\n");957 goto send_busy;958 }959 dev_err(hostdata->dev, "send error %d\n", rc);960 if (srp_req)961 atomic_inc(&hostdata->request_limit);962 goto send_error;963 }964 965 return 0;966 967 send_busy:968 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);969 970 free_event_struct(&hostdata->pool, evt_struct);971 if (srp_req && request_status != -1)972 atomic_inc(&hostdata->request_limit);973 return SCSI_MLQUEUE_HOST_BUSY;974 975 send_error:976 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);977 978 if (evt_struct->cmnd != NULL) {979 evt_struct->cmnd->result = DID_ERROR << 16;980 evt_struct->cmnd_done(evt_struct->cmnd);981 } else if (evt_struct->done)982 evt_struct->done(evt_struct);983 984 free_event_struct(&hostdata->pool, evt_struct);985 return 0;986}987 988/**989 * handle_cmd_rsp: - Handle responses from commands990 * @evt_struct: srp_event_struct to be handled991 *992 * Used as a callback by when sending scsi cmds.993 * Gets called by ibmvscsi_handle_crq()994*/995static void handle_cmd_rsp(struct srp_event_struct *evt_struct)996{997 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;998 struct scsi_cmnd *cmnd = evt_struct->cmnd;999 1000 if (unlikely(rsp->opcode != SRP_RSP)) {1001 if (printk_ratelimit())1002 dev_warn(evt_struct->hostdata->dev,1003 "bad SRP RSP type %#02x\n", rsp->opcode);1004 }1005 1006 if (cmnd) {1007 cmnd->result |= rsp->status;1008 if (scsi_status_is_check_condition(cmnd->result))1009 memcpy(cmnd->sense_buffer,1010 rsp->data,1011 be32_to_cpu(rsp->sense_data_len));1012 unmap_cmd_data(&evt_struct->iu.srp.cmd, 1013 evt_struct, 1014 evt_struct->hostdata->dev);1015 1016 if (rsp->flags & SRP_RSP_FLAG_DOOVER)1017 scsi_set_resid(cmnd,1018 be32_to_cpu(rsp->data_out_res_cnt));1019 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)1020 scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));1021 }1022 1023 if (evt_struct->cmnd_done)1024 evt_struct->cmnd_done(cmnd);1025}1026 1027/**1028 * lun_from_dev: - Returns the lun of the scsi device1029 * @dev: struct scsi_device1030 *1031*/1032static inline u16 lun_from_dev(struct scsi_device *dev)1033{1034 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;1035}1036 1037/**1038 * ibmvscsi_queuecommand_lck() - The queuecommand function of the scsi template1039 * @cmnd: struct scsi_cmnd to be executed1040 * @done: Callback function to be called when cmd is completed1041*/1042static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd)1043{1044 void (*done)(struct scsi_cmnd *) = scsi_done;1045 struct srp_cmd *srp_cmd;1046 struct srp_event_struct *evt_struct;1047 struct srp_indirect_buf *indirect;1048 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);1049 u16 lun = lun_from_dev(cmnd->device);1050 u8 out_fmt, in_fmt;1051 1052 cmnd->result = (DID_OK << 16);1053 evt_struct = get_event_struct(&hostdata->pool);1054 if (!evt_struct)1055 return SCSI_MLQUEUE_HOST_BUSY;1056 1057 /* Set up the actual SRP IU */1058 BUILD_BUG_ON(sizeof(evt_struct->iu.srp) != SRP_MAX_IU_LEN);1059 memset(&evt_struct->iu.srp, 0x00, sizeof(evt_struct->iu.srp));1060 srp_cmd = &evt_struct->iu.srp.cmd;1061 srp_cmd->opcode = SRP_CMD;1062 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));1063 int_to_scsilun(lun, &srp_cmd->lun);1064 1065 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {1066 if (!firmware_has_feature(FW_FEATURE_CMO))1067 sdev_printk(KERN_ERR, cmnd->device,1068 "couldn't convert cmd to srp_cmd\n");1069 free_event_struct(&hostdata->pool, evt_struct);1070 return SCSI_MLQUEUE_HOST_BUSY;1071 }1072 1073 init_event_struct(evt_struct,1074 handle_cmd_rsp,1075 VIOSRP_SRP_FORMAT,1076 scsi_cmd_to_rq(cmnd)->timeout / HZ);1077 1078 evt_struct->cmnd = cmnd;1079 evt_struct->cmnd_done = done;1080 1081 /* Fix up dma address of the buffer itself */1082 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;1083 out_fmt = srp_cmd->buf_fmt >> 4;1084 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);1085 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||1086 out_fmt == SRP_DATA_DESC_INDIRECT) &&1087 indirect->table_desc.va == 0) {1088 indirect->table_desc.va =1089 cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +1090 offsetof(struct srp_cmd, add_data) +1091 offsetof(struct srp_indirect_buf, desc_list));1092 }1093 1094 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);1095}1096 1097static DEF_SCSI_QCMD(ibmvscsi_queuecommand)1098 1099/* ------------------------------------------------------------1100 * Routines for driver initialization1101 */1102 1103/**1104 * map_persist_bufs: - Pre-map persistent data for adapter logins1105 * @hostdata: ibmvscsi_host_data of host1106 *1107 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.1108 * Return 1 on error, 0 on success.1109 */1110static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)1111{1112 1113 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,1114 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);1115 1116 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {1117 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");1118 return 1;1119 }1120 1121 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,1122 &hostdata->madapter_info,1123 sizeof(hostdata->madapter_info),1124 DMA_BIDIRECTIONAL);1125 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {1126 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");1127 dma_unmap_single(hostdata->dev, hostdata->caps_addr,1128 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);1129 return 1;1130 }1131 1132 return 0;1133}1134 1135/**1136 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins1137 * @hostdata: ibmvscsi_host_data of host1138 *1139 * Unmap the capabilities and adapter info DMA buffers1140 */1141static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)1142{1143 dma_unmap_single(hostdata->dev, hostdata->caps_addr,1144 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);1145 1146 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,1147 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);1148}1149 1150/**1151 * login_rsp: - Handle response to SRP login request1152 * @evt_struct: srp_event_struct with the response1153 *1154 * Used as a "done" callback by when sending srp_login. Gets called1155 * by ibmvscsi_handle_crq()1156*/1157static void login_rsp(struct srp_event_struct *evt_struct)1158{1159 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;1160 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {1161 case SRP_LOGIN_RSP: /* it worked! */1162 break;1163 case SRP_LOGIN_REJ: /* refused! */1164 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",1165 evt_struct->xfer_iu->srp.login_rej.reason);1166 /* Login failed. */1167 ibmvscsi_set_request_limit(hostdata, -1);1168 return;1169 default:1170 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",1171 evt_struct->xfer_iu->srp.login_rsp.opcode);1172 /* Login failed. */1173 ibmvscsi_set_request_limit(hostdata, -1);1174 return;1175 }1176 1177 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");1178 hostdata->client_migrated = 0;1179 1180 /* Now we know what the real request-limit is.1181 * This value is set rather than added to request_limit because1182 * request_limit could have been set to -1 by this client.1183 */1184 ibmvscsi_set_request_limit(hostdata,1185 be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta));1186 1187 /* If we had any pending I/Os, kick them */1188 hostdata->action = IBMVSCSI_HOST_ACTION_UNBLOCK;1189 wake_up(&hostdata->work_wait_q);1190}1191 1192/**1193 * send_srp_login: - Sends the srp login1194 * @hostdata: ibmvscsi_host_data of host1195 *1196 * Returns zero if successful.1197*/1198static int send_srp_login(struct ibmvscsi_host_data *hostdata)1199{1200 int rc;1201 unsigned long flags;1202 struct srp_login_req *login;1203 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);1204 1205 BUG_ON(!evt_struct);1206 init_event_struct(evt_struct, login_rsp,1207 VIOSRP_SRP_FORMAT, login_timeout);1208 1209 login = &evt_struct->iu.srp.login_req;1210 memset(login, 0, sizeof(*login));1211 login->opcode = SRP_LOGIN_REQ;1212 login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu));1213 login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |1214 SRP_BUF_FORMAT_INDIRECT);1215 1216 /* Start out with a request limit of 0, since this is negotiated in1217 * the login request we are just sending and login requests always1218 * get sent by the driver regardless of request_limit.1219 */1220 ibmvscsi_set_request_limit(hostdata, 0);1221 1222 spin_lock_irqsave(hostdata->host->host_lock, flags);1223 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);1224 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1225 dev_info(hostdata->dev, "sent SRP login\n");1226 return rc;1227};1228 1229/**1230 * capabilities_rsp: - Handle response to MAD adapter capabilities request1231 * @evt_struct: srp_event_struct with the response1232 *1233 * Used as a "done" callback by when sending adapter_info.1234 */1235static void capabilities_rsp(struct srp_event_struct *evt_struct)1236{1237 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;1238 1239 if (evt_struct->xfer_iu->mad.capabilities.common.status) {1240 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",1241 evt_struct->xfer_iu->mad.capabilities.common.status);1242 } else {1243 if (hostdata->caps.migration.common.server_support !=1244 cpu_to_be16(SERVER_SUPPORTS_CAP))1245 dev_info(hostdata->dev, "Partition migration not supported\n");1246 1247 if (client_reserve) {1248 if (hostdata->caps.reserve.common.server_support ==1249 cpu_to_be16(SERVER_SUPPORTS_CAP))1250 dev_info(hostdata->dev, "Client reserve enabled\n");1251 else1252 dev_info(hostdata->dev, "Client reserve not supported\n");1253 }1254 }1255 1256 send_srp_login(hostdata);1257}1258 1259/**1260 * send_mad_capabilities: - Sends the mad capabilities request1261 * and stores the result so it can be retrieved with1262 * @hostdata: ibmvscsi_host_data of host1263 */1264static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)1265{1266 struct viosrp_capabilities *req;1267 struct srp_event_struct *evt_struct;1268 unsigned long flags;1269 struct device_node *of_node = hostdata->dev->of_node;1270 const char *location;1271 1272 evt_struct = get_event_struct(&hostdata->pool);1273 BUG_ON(!evt_struct);1274 1275 init_event_struct(evt_struct, capabilities_rsp,1276 VIOSRP_MAD_FORMAT, info_timeout);1277 1278 req = &evt_struct->iu.mad.capabilities;1279 memset(req, 0, sizeof(*req));1280 1281 hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);1282 if (hostdata->client_migrated)1283 hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);1284 1285 strscpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),1286 sizeof(hostdata->caps.name));1287 1288 location = of_get_property(of_node, "ibm,loc-code", NULL);1289 location = location ? location : dev_name(hostdata->dev);1290 strscpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));1291 1292 req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);1293 req->buffer = cpu_to_be64(hostdata->caps_addr);1294 1295 hostdata->caps.migration.common.cap_type =1296 cpu_to_be32(MIGRATION_CAPABILITIES);1297 hostdata->caps.migration.common.length =1298 cpu_to_be16(sizeof(hostdata->caps.migration));1299 hostdata->caps.migration.common.server_support =1300 cpu_to_be16(SERVER_SUPPORTS_CAP);1301 hostdata->caps.migration.ecl = cpu_to_be32(1);1302 1303 if (client_reserve) {1304 hostdata->caps.reserve.common.cap_type =1305 cpu_to_be32(RESERVATION_CAPABILITIES);1306 hostdata->caps.reserve.common.length =1307 cpu_to_be16(sizeof(hostdata->caps.reserve));1308 hostdata->caps.reserve.common.server_support =1309 cpu_to_be16(SERVER_SUPPORTS_CAP);1310 hostdata->caps.reserve.type =1311 cpu_to_be32(CLIENT_RESERVE_SCSI_2);1312 req->common.length =1313 cpu_to_be16(sizeof(hostdata->caps));1314 } else1315 req->common.length = cpu_to_be16(sizeof(hostdata->caps) -1316 sizeof(hostdata->caps.reserve));1317 1318 spin_lock_irqsave(hostdata->host->host_lock, flags);1319 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))1320 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");1321 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1322};1323 1324/**1325 * fast_fail_rsp: - Handle response to MAD enable fast fail1326 * @evt_struct: srp_event_struct with the response1327 *1328 * Used as a "done" callback by when sending enable fast fail. Gets called1329 * by ibmvscsi_handle_crq()1330 */1331static void fast_fail_rsp(struct srp_event_struct *evt_struct)1332{1333 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;1334 u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);1335 1336 if (status == VIOSRP_MAD_NOT_SUPPORTED)1337 dev_err(hostdata->dev, "fast_fail not supported in server\n");1338 else if (status == VIOSRP_MAD_FAILED)1339 dev_err(hostdata->dev, "fast_fail request failed\n");1340 else if (status != VIOSRP_MAD_SUCCESS)1341 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);1342 1343 send_mad_capabilities(hostdata);1344}1345 1346/**1347 * enable_fast_fail() - Start host initialization1348 * @hostdata: ibmvscsi_host_data of host1349 *1350 * Returns zero if successful.1351 */1352static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)1353{1354 int rc;1355 unsigned long flags;1356 struct viosrp_fast_fail *fast_fail_mad;1357 struct srp_event_struct *evt_struct;1358 1359 if (!fast_fail) {1360 send_mad_capabilities(hostdata);1361 return 0;1362 }1363 1364 evt_struct = get_event_struct(&hostdata->pool);1365 BUG_ON(!evt_struct);1366 1367 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);1368 1369 fast_fail_mad = &evt_struct->iu.mad.fast_fail;1370 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));1371 fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);1372 fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));1373 1374 spin_lock_irqsave(hostdata->host->host_lock, flags);1375 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);1376 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1377 return rc;1378}1379 1380/**1381 * adapter_info_rsp: - Handle response to MAD adapter info request1382 * @evt_struct: srp_event_struct with the response1383 *1384 * Used as a "done" callback by when sending adapter_info. Gets called1385 * by ibmvscsi_handle_crq()1386*/1387static void adapter_info_rsp(struct srp_event_struct *evt_struct)1388{1389 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;1390 1391 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {1392 dev_err(hostdata->dev, "error %d getting adapter info\n",1393 evt_struct->xfer_iu->mad.adapter_info.common.status);1394 } else {1395 dev_info(hostdata->dev, "host srp version: %s, "1396 "host partition %s (%d), OS %d, max io %u\n",1397 hostdata->madapter_info.srp_version,1398 hostdata->madapter_info.partition_name,1399 be32_to_cpu(hostdata->madapter_info.partition_number),1400 be32_to_cpu(hostdata->madapter_info.os_type),1401 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));1402 1403 if (hostdata->madapter_info.port_max_txu[0]) 1404 hostdata->host->max_sectors = 1405 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;1406 1407 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&1408 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {1409 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",1410 hostdata->madapter_info.srp_version);1411 dev_err(hostdata->dev, "limiting scatterlists to %d\n",1412 MAX_INDIRECT_BUFS);1413 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;1414 }1415 1416 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {1417 enable_fast_fail(hostdata);1418 return;1419 }1420 }1421 1422 send_srp_login(hostdata);1423}1424 1425/**1426 * send_mad_adapter_info: - Sends the mad adapter info request1427 * and stores the result so it can be retrieved with1428 * sysfs. We COULD consider causing a failure if the1429 * returned SRP version doesn't match ours.1430 * @hostdata: ibmvscsi_host_data of host1431 * 1432 * Returns zero if successful.1433*/1434static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)1435{1436 struct viosrp_adapter_info *req;1437 struct srp_event_struct *evt_struct;1438 unsigned long flags;1439 1440 evt_struct = get_event_struct(&hostdata->pool);1441 BUG_ON(!evt_struct);1442 1443 init_event_struct(evt_struct,1444 adapter_info_rsp,1445 VIOSRP_MAD_FORMAT,1446 info_timeout);1447 1448 req = &evt_struct->iu.mad.adapter_info;1449 memset(req, 0x00, sizeof(*req));1450 1451 req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);1452 req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));1453 req->buffer = cpu_to_be64(hostdata->adapter_info_addr);1454 1455 spin_lock_irqsave(hostdata->host->host_lock, flags);1456 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))1457 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");1458 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1459};1460 1461/*1462 * init_adapter() - Start virtual adapter initialization sequence1463 */1464static void init_adapter(struct ibmvscsi_host_data *hostdata)1465{1466 send_mad_adapter_info(hostdata);1467}1468 1469/*1470 * sync_completion: Signal that a synchronous command has completed1471 * Note that after returning from this call, the evt_struct is freed.1472 * the caller waiting on this completion shouldn't touch the evt_struct1473 * again.1474 */1475static void sync_completion(struct srp_event_struct *evt_struct)1476{1477 /* copy the response back */1478 if (evt_struct->sync_srp)1479 *evt_struct->sync_srp = *evt_struct->xfer_iu;1480 1481 complete(&evt_struct->comp);1482}1483 1484/*1485 * ibmvscsi_eh_abort_handler: Abort a command...from scsi host template1486 * send this over to the server and wait synchronously for the response1487 */1488static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)1489{1490 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);1491 struct srp_tsk_mgmt *tsk_mgmt;1492 struct srp_event_struct *evt;1493 struct srp_event_struct *tmp_evt, *found_evt;1494 union viosrp_iu srp_rsp;1495 int rsp_rc;1496 unsigned long flags;1497 u16 lun = lun_from_dev(cmd->device);1498 unsigned long wait_switch = 0;1499 1500 /* First, find this command in our sent list so we can figure1501 * out the correct tag1502 */1503 spin_lock_irqsave(hostdata->host->host_lock, flags);1504 wait_switch = jiffies + (init_timeout * HZ);1505 do {1506 found_evt = NULL;1507 list_for_each_entry(tmp_evt, &hostdata->sent, list) {1508 if (tmp_evt->cmnd == cmd) {1509 found_evt = tmp_evt;1510 break;1511 }1512 }1513 1514 if (!found_evt) {1515 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1516 return SUCCESS;1517 }1518 1519 evt = get_event_struct(&hostdata->pool);1520 if (evt == NULL) {1521 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1522 sdev_printk(KERN_ERR, cmd->device,1523 "failed to allocate abort event\n");1524 return FAILED;1525 }1526 1527 init_event_struct(evt,1528 sync_completion,1529 VIOSRP_SRP_FORMAT,1530 abort_timeout);1531 1532 tsk_mgmt = &evt->iu.srp.tsk_mgmt;1533 1534 /* Set up an abort SRP command */1535 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));1536 tsk_mgmt->opcode = SRP_TSK_MGMT;1537 int_to_scsilun(lun, &tsk_mgmt->lun);1538 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;1539 tsk_mgmt->task_tag = (u64) found_evt;1540 1541 evt->sync_srp = &srp_rsp;1542 1543 init_completion(&evt->comp);1544 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);1545 1546 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)1547 break;1548 1549 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1550 msleep(10);1551 spin_lock_irqsave(hostdata->host->host_lock, flags);1552 } while (time_before(jiffies, wait_switch));1553 1554 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1555 1556 if (rsp_rc != 0) {1557 sdev_printk(KERN_ERR, cmd->device,1558 "failed to send abort() event. rc=%d\n", rsp_rc);1559 return FAILED;1560 }1561 1562 sdev_printk(KERN_INFO, cmd->device,1563 "aborting command. lun 0x%llx, tag 0x%llx\n",1564 (((u64) lun) << 48), (u64) found_evt);1565 1566 wait_for_completion(&evt->comp);1567 1568 /* make sure we got a good response */1569 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {1570 if (printk_ratelimit())1571 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",1572 srp_rsp.srp.rsp.opcode);1573 return FAILED;1574 }1575 1576 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)1577 rsp_rc = *((int *)srp_rsp.srp.rsp.data);1578 else1579 rsp_rc = srp_rsp.srp.rsp.status;1580 1581 if (rsp_rc) {1582 if (printk_ratelimit())1583 sdev_printk(KERN_WARNING, cmd->device,1584 "abort code %d for task tag 0x%llx\n",1585 rsp_rc, tsk_mgmt->task_tag);1586 return FAILED;1587 }1588 1589 /* Because we dropped the spinlock above, it's possible1590 * The event is no longer in our list. Make sure it didn't1591 * complete while we were aborting1592 */1593 spin_lock_irqsave(hostdata->host->host_lock, flags);1594 found_evt = NULL;1595 list_for_each_entry(tmp_evt, &hostdata->sent, list) {1596 if (tmp_evt->cmnd == cmd) {1597 found_evt = tmp_evt;1598 break;1599 }1600 }1601 1602 if (found_evt == NULL) {1603 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1604 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",1605 tsk_mgmt->task_tag);1606 return SUCCESS;1607 }1608 1609 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",1610 tsk_mgmt->task_tag);1611 1612 cmd->result = (DID_ABORT << 16);1613 list_del(&found_evt->list);1614 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,1615 found_evt->hostdata->dev);1616 free_event_struct(&found_evt->hostdata->pool, found_evt);1617 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1618 atomic_inc(&hostdata->request_limit);1619 return SUCCESS;1620}1621 1622/*1623 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host 1624 * template send this over to the server and wait synchronously for the 1625 * response1626 */1627static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)1628{1629 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);1630 struct srp_tsk_mgmt *tsk_mgmt;1631 struct srp_event_struct *evt;1632 struct srp_event_struct *tmp_evt, *pos;1633 union viosrp_iu srp_rsp;1634 int rsp_rc;1635 unsigned long flags;1636 u16 lun = lun_from_dev(cmd->device);1637 unsigned long wait_switch = 0;1638 1639 spin_lock_irqsave(hostdata->host->host_lock, flags);1640 wait_switch = jiffies + (init_timeout * HZ);1641 do {1642 evt = get_event_struct(&hostdata->pool);1643 if (evt == NULL) {1644 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1645 sdev_printk(KERN_ERR, cmd->device,1646 "failed to allocate reset event\n");1647 return FAILED;1648 }1649 1650 init_event_struct(evt,1651 sync_completion,1652 VIOSRP_SRP_FORMAT,1653 reset_timeout);1654 1655 tsk_mgmt = &evt->iu.srp.tsk_mgmt;1656 1657 /* Set up a lun reset SRP command */1658 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));1659 tsk_mgmt->opcode = SRP_TSK_MGMT;1660 int_to_scsilun(lun, &tsk_mgmt->lun);1661 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;1662 1663 evt->sync_srp = &srp_rsp;1664 1665 init_completion(&evt->comp);1666 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);1667 1668 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)1669 break;1670 1671 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1672 msleep(10);1673 spin_lock_irqsave(hostdata->host->host_lock, flags);1674 } while (time_before(jiffies, wait_switch));1675 1676 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1677 1678 if (rsp_rc != 0) {1679 sdev_printk(KERN_ERR, cmd->device,1680 "failed to send reset event. rc=%d\n", rsp_rc);1681 return FAILED;1682 }1683 1684 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",1685 (((u64) lun) << 48));1686 1687 wait_for_completion(&evt->comp);1688 1689 /* make sure we got a good response */1690 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {1691 if (printk_ratelimit())1692 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",1693 srp_rsp.srp.rsp.opcode);1694 return FAILED;1695 }1696 1697 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)1698 rsp_rc = *((int *)srp_rsp.srp.rsp.data);1699 else1700 rsp_rc = srp_rsp.srp.rsp.status;1701 1702 if (rsp_rc) {1703 if (printk_ratelimit())1704 sdev_printk(KERN_WARNING, cmd->device,1705 "reset code %d for task tag 0x%llx\n",1706 rsp_rc, tsk_mgmt->task_tag);1707 return FAILED;1708 }1709 1710 /* We need to find all commands for this LUN that have not yet been1711 * responded to, and fail them with DID_RESET1712 */1713 spin_lock_irqsave(hostdata->host->host_lock, flags);1714 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {1715 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {1716 if (tmp_evt->cmnd)1717 tmp_evt->cmnd->result = (DID_RESET << 16);1718 list_del(&tmp_evt->list);1719 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,1720 tmp_evt->hostdata->dev);1721 free_event_struct(&tmp_evt->hostdata->pool,1722 tmp_evt);1723 atomic_inc(&hostdata->request_limit);1724 if (tmp_evt->cmnd_done)1725 tmp_evt->cmnd_done(tmp_evt->cmnd);1726 else if (tmp_evt->done)1727 tmp_evt->done(tmp_evt);1728 }1729 }1730 spin_unlock_irqrestore(hostdata->host->host_lock, flags);1731 return SUCCESS;1732}1733 1734/**1735 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server1736 * @cmd: struct scsi_cmnd having problems1737*/1738static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)1739{1740 unsigned long wait_switch = 0;1741 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);1742 1743 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");1744 1745 ibmvscsi_reset_host(hostdata);1746 1747 for (wait_switch = jiffies + (init_timeout * HZ);1748 time_before(jiffies, wait_switch) &&1749 atomic_read(&hostdata->request_limit) < 2;) {1750 1751 msleep(10);1752 }1753 1754 if (atomic_read(&hostdata->request_limit) <= 0)1755 return FAILED;1756 1757 return SUCCESS;1758}1759 1760/**1761 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ1762 * @crq: Command/Response queue1763 * @hostdata: ibmvscsi_host_data of host1764 *1765*/1766static void ibmvscsi_handle_crq(struct viosrp_crq *crq,1767 struct ibmvscsi_host_data *hostdata)1768{1769 long rc;1770 unsigned long flags;1771 /* The hypervisor copies our tag value here so no byteswapping */1772 struct srp_event_struct *evt_struct =1773 (__force struct srp_event_struct *)crq->IU_data_ptr;1774 switch (crq->valid) {1775 case VIOSRP_CRQ_INIT_RSP: /* initialization */1776 switch (crq->format) {1777 case VIOSRP_CRQ_INIT: /* Initialization message */1778 dev_info(hostdata->dev, "partner initialized\n");1779 /* Send back a response */1780 rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);1781 if (rc == 0) {1782 /* Now login */1783 init_adapter(hostdata);1784 } else {1785 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);1786 }1787 1788 break;1789 case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */1790 dev_info(hostdata->dev, "partner initialization complete\n");1791 1792 /* Now login */1793 init_adapter(hostdata);1794 break;1795 default:1796 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);1797 }1798 return;1799 case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */1800 scsi_block_requests(hostdata->host);1801 ibmvscsi_set_request_limit(hostdata, 0);1802 if (crq->format == 0x06) {1803 /* We need to re-setup the interpartition connection */1804 dev_info(hostdata->dev, "Re-enabling adapter!\n");1805 hostdata->client_migrated = 1;1806 hostdata->action = IBMVSCSI_HOST_ACTION_REENABLE;1807 purge_requests(hostdata, DID_REQUEUE);1808 wake_up(&hostdata->work_wait_q);1809 } else {1810 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",1811 crq->format);1812 ibmvscsi_reset_host(hostdata);1813 }1814 return;1815 case VIOSRP_CRQ_CMD_RSP: /* real payload */1816 break;1817 default:1818 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",1819 crq->valid);1820 return;1821 }1822 1823 /* The only kind of payload CRQs we should get are responses to1824 * things we send. Make sure this response is to something we1825 * actually sent1826 */1827 if (!valid_event_struct(&hostdata->pool, evt_struct)) {1828 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",1829 evt_struct);1830 return;1831 }1832 1833 if (atomic_read(&evt_struct->free)) {1834 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",1835 evt_struct);1836 return;1837 }1838 1839 if (crq->format == VIOSRP_SRP_FORMAT)1840 atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),1841 &hostdata->request_limit);1842 1843 del_timer(&evt_struct->timer);1844 1845 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)1846 evt_struct->cmnd->result = DID_ERROR << 16;1847 if (evt_struct->done)1848 evt_struct->done(evt_struct);1849 else1850 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");1851 1852 /*1853 * Lock the host_lock before messing with these structures, since we1854 * are running in a task context1855 */1856 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);1857 list_del(&evt_struct->list);1858 free_event_struct(&evt_struct->hostdata->pool, evt_struct);1859 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);1860}1861 1862/**1863 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.1864 * @sdev: struct scsi_device device to configure1865 *1866 * Enable allow_restart for a device if it is a disk. Adjust the1867 * queue_depth here also as is required by the documentation for1868 * struct scsi_host_template.1869 */1870static int ibmvscsi_slave_configure(struct scsi_device *sdev)1871{1872 struct Scsi_Host *shost = sdev->host;1873 unsigned long lock_flags = 0;1874 1875 spin_lock_irqsave(shost->host_lock, lock_flags);1876 if (sdev->type == TYPE_DISK) {1877 sdev->allow_restart = 1;1878 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);1879 }1880 spin_unlock_irqrestore(shost->host_lock, lock_flags);1881 return 0;1882}1883 1884/**1885 * ibmvscsi_change_queue_depth - Change the device's queue depth1886 * @sdev: scsi device struct1887 * @qdepth: depth to set1888 *1889 * Return value:1890 * actual depth set1891 **/1892static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)1893{1894 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)1895 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;1896 return scsi_change_queue_depth(sdev, qdepth);1897}1898 1899/* ------------------------------------------------------------1900 * sysfs attributes1901 */1902static ssize_t show_host_vhost_loc(struct device *dev,1903 struct device_attribute *attr, char *buf)1904{1905 struct Scsi_Host *shost = class_to_shost(dev);1906 struct ibmvscsi_host_data *hostdata = shost_priv(shost);1907 int len;1908 1909 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",1910 hostdata->caps.loc);1911 return len;1912}1913 1914static struct device_attribute ibmvscsi_host_vhost_loc = {1915 .attr = {1916 .name = "vhost_loc",1917 .mode = S_IRUGO,1918 },1919 .show = show_host_vhost_loc,1920};1921 1922static ssize_t show_host_vhost_name(struct device *dev,1923 struct device_attribute *attr, char *buf)1924{1925 struct Scsi_Host *shost = class_to_shost(dev);1926 struct ibmvscsi_host_data *hostdata = shost_priv(shost);1927 int len;1928 1929 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",1930 hostdata->caps.name);1931 return len;1932}1933 1934static struct device_attribute ibmvscsi_host_vhost_name = {1935 .attr = {1936 .name = "vhost_name",1937 .mode = S_IRUGO,1938 },1939 .show = show_host_vhost_name,1940};1941 1942static ssize_t show_host_srp_version(struct device *dev,1943 struct device_attribute *attr, char *buf)1944{1945 struct Scsi_Host *shost = class_to_shost(dev);1946 struct ibmvscsi_host_data *hostdata = shost_priv(shost);1947 int len;1948 1949 len = snprintf(buf, PAGE_SIZE, "%s\n",1950 hostdata->madapter_info.srp_version);1951 return len;1952}1953 1954static struct device_attribute ibmvscsi_host_srp_version = {1955 .attr = {1956 .name = "srp_version",1957 .mode = S_IRUGO,1958 },1959 .show = show_host_srp_version,1960};1961 1962static ssize_t show_host_partition_name(struct device *dev,1963 struct device_attribute *attr,1964 char *buf)1965{1966 struct Scsi_Host *shost = class_to_shost(dev);1967 struct ibmvscsi_host_data *hostdata = shost_priv(shost);1968 int len;1969 1970 len = snprintf(buf, PAGE_SIZE, "%s\n",1971 hostdata->madapter_info.partition_name);1972 return len;1973}1974 1975static struct device_attribute ibmvscsi_host_partition_name = {1976 .attr = {1977 .name = "partition_name",1978 .mode = S_IRUGO,1979 },1980 .show = show_host_partition_name,1981};1982 1983static ssize_t show_host_partition_number(struct device *dev,1984 struct device_attribute *attr,1985 char *buf)1986{1987 struct Scsi_Host *shost = class_to_shost(dev);1988 struct ibmvscsi_host_data *hostdata = shost_priv(shost);1989 int len;1990 1991 len = snprintf(buf, PAGE_SIZE, "%d\n",1992 be32_to_cpu(hostdata->madapter_info.partition_number));1993 return len;1994}1995 1996static struct device_attribute ibmvscsi_host_partition_number = {1997 .attr = {1998 .name = "partition_number",1999 .mode = S_IRUGO,2000 },2001 .show = show_host_partition_number,2002};2003 2004static ssize_t show_host_mad_version(struct device *dev,2005 struct device_attribute *attr, char *buf)2006{2007 struct Scsi_Host *shost = class_to_shost(dev);2008 struct ibmvscsi_host_data *hostdata = shost_priv(shost);2009 int len;2010 2011 len = snprintf(buf, PAGE_SIZE, "%d\n",2012 be32_to_cpu(hostdata->madapter_info.mad_version));2013 return len;2014}2015 2016static struct device_attribute ibmvscsi_host_mad_version = {2017 .attr = {2018 .name = "mad_version",2019 .mode = S_IRUGO,2020 },2021 .show = show_host_mad_version,2022};2023 2024static ssize_t show_host_os_type(struct device *dev,2025 struct device_attribute *attr, char *buf)2026{2027 struct Scsi_Host *shost = class_to_shost(dev);2028 struct ibmvscsi_host_data *hostdata = shost_priv(shost);2029 int len;2030 2031 len = snprintf(buf, PAGE_SIZE, "%d\n",2032 be32_to_cpu(hostdata->madapter_info.os_type));2033 return len;2034}2035 2036static struct device_attribute ibmvscsi_host_os_type = {2037 .attr = {2038 .name = "os_type",2039 .mode = S_IRUGO,2040 },2041 .show = show_host_os_type,2042};2043 2044static ssize_t show_host_config(struct device *dev,2045 struct device_attribute *attr, char *buf)2046{2047 return 0;2048}2049 2050static struct device_attribute ibmvscsi_host_config = {2051 .attr = {2052 .name = "config",2053 .mode = S_IRUGO,2054 },2055 .show = show_host_config,2056};2057 2058static int ibmvscsi_host_reset(struct Scsi_Host *shost, int reset_type)2059{2060 struct ibmvscsi_host_data *hostdata = shost_priv(shost);2061 2062 dev_info(hostdata->dev, "Initiating adapter reset!\n");2063 ibmvscsi_reset_host(hostdata);2064 2065 return 0;2066}2067 2068static struct attribute *ibmvscsi_host_attrs[] = {2069 &ibmvscsi_host_vhost_loc.attr,2070 &ibmvscsi_host_vhost_name.attr,2071 &ibmvscsi_host_srp_version.attr,2072 &ibmvscsi_host_partition_name.attr,2073 &ibmvscsi_host_partition_number.attr,2074 &ibmvscsi_host_mad_version.attr,2075 &ibmvscsi_host_os_type.attr,2076 &ibmvscsi_host_config.attr,2077 NULL2078};2079 2080ATTRIBUTE_GROUPS(ibmvscsi_host);2081 2082/* ------------------------------------------------------------2083 * SCSI driver registration2084 */2085static struct scsi_host_template driver_template = {2086 .module = THIS_MODULE,2087 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,2088 .proc_name = "ibmvscsi",2089 .queuecommand = ibmvscsi_queuecommand,2090 .eh_timed_out = srp_timed_out,2091 .eh_abort_handler = ibmvscsi_eh_abort_handler,2092 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,2093 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,2094 .slave_configure = ibmvscsi_slave_configure,2095 .change_queue_depth = ibmvscsi_change_queue_depth,2096 .host_reset = ibmvscsi_host_reset,2097 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,2098 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,2099 .this_id = -1,2100 .sg_tablesize = SG_ALL,2101 .shost_groups = ibmvscsi_host_groups,2102};2103 2104/**2105 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver2106 *2107 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned2108 *2109 * Return value:2110 * Number of bytes of IO data the driver will need to perform well.2111 */2112static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)2113{2114 /* iu_storage data allocated in initialize_event_pool */2115 unsigned long desired_io = max_events * sizeof(union viosrp_iu);2116 2117 /* add io space for sg data */2118 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *2119 IBMVSCSI_CMDS_PER_LUN_DEFAULT);2120 2121 return desired_io;2122}2123 2124static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)2125{2126 unsigned long flags;2127 int rc;2128 char *action = "reset";2129 2130 spin_lock_irqsave(hostdata->host->host_lock, flags);2131 switch (hostdata->action) {2132 case IBMVSCSI_HOST_ACTION_UNBLOCK:2133 rc = 0;2134 break;2135 case IBMVSCSI_HOST_ACTION_RESET:2136 spin_unlock_irqrestore(hostdata->host->host_lock, flags);2137 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);2138 spin_lock_irqsave(hostdata->host->host_lock, flags);2139 if (!rc)2140 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);2141 vio_enable_interrupts(to_vio_dev(hostdata->dev));2142 break;2143 case IBMVSCSI_HOST_ACTION_REENABLE:2144 action = "enable";2145 spin_unlock_irqrestore(hostdata->host->host_lock, flags);2146 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);2147 spin_lock_irqsave(hostdata->host->host_lock, flags);2148 if (!rc)2149 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);2150 break;2151 case IBMVSCSI_HOST_ACTION_NONE:2152 default:2153 spin_unlock_irqrestore(hostdata->host->host_lock, flags);2154 return;2155 }2156 2157 hostdata->action = IBMVSCSI_HOST_ACTION_NONE;2158 spin_unlock_irqrestore(hostdata->host->host_lock, flags);2159 2160 if (rc) {2161 ibmvscsi_set_request_limit(hostdata, -1);2162 dev_err(hostdata->dev, "error after %s\n", action);2163 }2164 2165 scsi_unblock_requests(hostdata->host);2166}2167 2168static int __ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)2169{2170 if (kthread_should_stop())2171 return 1;2172 switch (hostdata->action) {2173 case IBMVSCSI_HOST_ACTION_NONE:2174 return 0;2175 case IBMVSCSI_HOST_ACTION_RESET:2176 case IBMVSCSI_HOST_ACTION_REENABLE:2177 case IBMVSCSI_HOST_ACTION_UNBLOCK:2178 default:2179 break;2180 }2181 2182 return 1;2183}2184 2185static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)2186{2187 unsigned long flags;2188 int rc;2189 2190 spin_lock_irqsave(hostdata->host->host_lock, flags);2191 rc = __ibmvscsi_work_to_do(hostdata);2192 spin_unlock_irqrestore(hostdata->host->host_lock, flags);2193 2194 return rc;2195}2196 2197static int ibmvscsi_work(void *data)2198{2199 struct ibmvscsi_host_data *hostdata = data;2200 int rc;2201 2202 set_user_nice(current, MIN_NICE);2203 2204 while (1) {2205 rc = wait_event_interruptible(hostdata->work_wait_q,2206 ibmvscsi_work_to_do(hostdata));2207 2208 BUG_ON(rc);2209 2210 if (kthread_should_stop())2211 break;2212 2213 ibmvscsi_do_work(hostdata);2214 }2215 2216 return 0;2217}2218 2219/*2220 * Called by bus code for each adapter2221 */2222static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)2223{2224 struct ibmvscsi_host_data *hostdata;2225 struct Scsi_Host *host;2226 struct device *dev = &vdev->dev;2227 struct srp_rport_identifiers ids;2228 struct srp_rport *rport;2229 unsigned long wait_switch = 0;2230 int rc;2231 2232 dev_set_drvdata(&vdev->dev, NULL);2233 2234 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));2235 if (!host) {2236 dev_err(&vdev->dev, "couldn't allocate host data\n");2237 goto scsi_host_alloc_failed;2238 }2239 2240 host->transportt = ibmvscsi_transport_template;2241 hostdata = shost_priv(host);2242 memset(hostdata, 0x00, sizeof(*hostdata));2243 INIT_LIST_HEAD(&hostdata->sent);2244 init_waitqueue_head(&hostdata->work_wait_q);2245 hostdata->host = host;2246 hostdata->dev = dev;2247 ibmvscsi_set_request_limit(hostdata, -1);2248 hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;2249 2250 if (map_persist_bufs(hostdata)) {2251 dev_err(&vdev->dev, "couldn't map persistent buffers\n");2252 goto persist_bufs_failed;2253 }2254 2255 hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",2256 "ibmvscsi", host->host_no);2257 2258 if (IS_ERR(hostdata->work_thread)) {2259 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",2260 PTR_ERR(hostdata->work_thread));2261 goto init_crq_failed;2262 }2263 2264 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);2265 if (rc != 0 && rc != H_RESOURCE) {2266 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);2267 goto kill_kthread;2268 }2269 if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {2270 dev_err(&vdev->dev, "couldn't initialize event pool\n");2271 goto init_pool_failed;2272 }2273 2274 host->max_lun = IBMVSCSI_MAX_LUN;2275 host->max_id = max_id;2276 host->max_channel = max_channel;2277 host->max_cmd_len = 16;2278 2279 dev_info(dev,2280 "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",2281 host->max_id, host->max_lun, host->max_channel);2282 2283 if (scsi_add_host(hostdata->host, hostdata->dev))2284 goto add_host_failed;2285 2286 /* we don't have a proper target_port_id so let's use the fake one */2287 memcpy(ids.port_id, hostdata->madapter_info.partition_name,2288 sizeof(ids.port_id));2289 ids.roles = SRP_RPORT_ROLE_TARGET;2290 rport = srp_rport_add(host, &ids);2291 if (IS_ERR(rport))2292 goto add_srp_port_failed;2293 2294 /* Try to send an initialization message. Note that this is allowed2295 * to fail if the other end is not acive. In that case we don't2296 * want to scan2297 */2298 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 02299 || rc == H_RESOURCE) {2300 /*2301 * Wait around max init_timeout secs for the adapter to finish2302 * initializing. When we are done initializing, we will have a2303 * valid request_limit. We don't want Linux scanning before2304 * we are ready.2305 */2306 for (wait_switch = jiffies + (init_timeout * HZ);2307 time_before(jiffies, wait_switch) &&2308 atomic_read(&hostdata->request_limit) < 2;) {2309 2310 msleep(10);2311 }2312 2313 /* if we now have a valid request_limit, initiate a scan */2314 if (atomic_read(&hostdata->request_limit) > 0)2315 scsi_scan_host(host);2316 }2317 2318 dev_set_drvdata(&vdev->dev, hostdata);2319 spin_lock(&ibmvscsi_driver_lock);2320 list_add_tail(&hostdata->host_list, &ibmvscsi_head);2321 spin_unlock(&ibmvscsi_driver_lock);2322 return 0;2323 2324 add_srp_port_failed:2325 scsi_remove_host(hostdata->host);2326 add_host_failed:2327 release_event_pool(&hostdata->pool, hostdata);2328 init_pool_failed:2329 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);2330 kill_kthread:2331 kthread_stop(hostdata->work_thread);2332 init_crq_failed:2333 unmap_persist_bufs(hostdata);2334 persist_bufs_failed:2335 scsi_host_put(host);2336 scsi_host_alloc_failed:2337 return -1;2338}2339 2340static void ibmvscsi_remove(struct vio_dev *vdev)2341{2342 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);2343 2344 srp_remove_host(hostdata->host);2345 scsi_remove_host(hostdata->host);2346 2347 purge_requests(hostdata, DID_ERROR);2348 release_event_pool(&hostdata->pool, hostdata);2349 2350 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,2351 max_events);2352 2353 kthread_stop(hostdata->work_thread);2354 unmap_persist_bufs(hostdata);2355 2356 spin_lock(&ibmvscsi_driver_lock);2357 list_del(&hostdata->host_list);2358 spin_unlock(&ibmvscsi_driver_lock);2359 2360 scsi_host_put(hostdata->host);2361}2362 2363/**2364 * ibmvscsi_resume: Resume from suspend2365 * @dev: device struct2366 *2367 * We may have lost an interrupt across suspend/resume, so kick the2368 * interrupt handler2369 */2370static int ibmvscsi_resume(struct device *dev)2371{2372 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);2373 vio_disable_interrupts(to_vio_dev(hostdata->dev));2374 tasklet_schedule(&hostdata->srp_task);2375 2376 return 0;2377}2378 2379/*2380 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we 2381 * support.2382 */2383static const struct vio_device_id ibmvscsi_device_table[] = {2384 {"vscsi", "IBM,v-scsi"},2385 { "", "" }2386};2387MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);2388 2389static const struct dev_pm_ops ibmvscsi_pm_ops = {2390 .resume = ibmvscsi_resume2391};2392 2393static struct vio_driver ibmvscsi_driver = {2394 .id_table = ibmvscsi_device_table,2395 .probe = ibmvscsi_probe,2396 .remove = ibmvscsi_remove,2397 .get_desired_dma = ibmvscsi_get_desired_dma,2398 .name = "ibmvscsi",2399 .pm = &ibmvscsi_pm_ops,2400};2401 2402static struct srp_function_template ibmvscsi_transport_functions = {2403};2404 2405static int __init ibmvscsi_module_init(void)2406{2407 int ret;2408 2409 /* Ensure we have two requests to do error recovery */2410 driver_template.can_queue = max_requests;2411 max_events = max_requests + 2;2412 2413 if (!firmware_has_feature(FW_FEATURE_VIO))2414 return -ENODEV;2415 2416 ibmvscsi_transport_template =2417 srp_attach_transport(&ibmvscsi_transport_functions);2418 if (!ibmvscsi_transport_template)2419 return -ENOMEM;2420 2421 ret = vio_register_driver(&ibmvscsi_driver);2422 if (ret)2423 srp_release_transport(ibmvscsi_transport_template);2424 return ret;2425}2426 2427static void __exit ibmvscsi_module_exit(void)2428{2429 vio_unregister_driver(&ibmvscsi_driver);2430 srp_release_transport(ibmvscsi_transport_template);2431}2432 2433module_init(ibmvscsi_module_init);2434module_exit(ibmvscsi_module_exit);2435