| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Dave C Boutcher | 5515 | 52.80% | 13 | 11.30% |
| Brian King | 2518 | 24.10% | 22 | 19.13% |
| Robert Jennings | 622 | 5.95% | 8 | 6.96% |
| FUJITA Tomonori | 410 | 3.92% | 9 | 7.83% |
| Tyrel Datwyler | 344 | 3.29% | 16 | 13.91% |
| James Bottomley | 268 | 2.57% | 3 | 2.61% |
| Anton Blanchard | 190 | 1.82% | 2 | 1.74% |
| Benjamin Herrenschmidt | 153 | 1.46% | 2 | 1.74% |
| Linda Xie | 127 | 1.22% | 1 | 0.87% |
| Kees Cook | 54 | 0.52% | 2 | 1.74% |
| Bart Van Assche | 48 | 0.46% | 4 | 3.48% |
| Lee Jones | 24 | 0.23% | 1 | 0.87% |
| Laurent Vivier | 22 | 0.21% | 2 | 1.74% |
| David Woodhouse | 18 | 0.17% | 1 | 0.87% |
| Tony Jones | 17 | 0.16% | 1 | 0.87% |
| Greg Kroah-Hartman | 16 | 0.15% | 1 | 0.87% |
| Yani Ioannou | 16 | 0.15% | 1 | 0.87% |
| Stephen Rothwell | 15 | 0.14% | 5 | 4.35% |
| Jeff Garzik | 12 | 0.11% | 1 | 0.87% |
| Segher Boessenkool | 10 | 0.10% | 1 | 0.87% |
| Christoph Hellwig | 7 | 0.07% | 2 | 1.74% |
| Ingo Molnar | 6 | 0.06% | 1 | 0.87% |
| Nathan Chancellor | 6 | 0.06% | 1 | 0.87% |
| Thomas Gleixner | 6 | 0.06% | 2 | 1.74% |
| Hannes Reinecke | 3 | 0.03% | 1 | 0.87% |
| Breno Leitão | 2 | 0.02% | 1 | 0.87% |
| ChenTao | 2 | 0.02% | 1 | 0.87% |
| Boaz Harrosh | 2 | 0.02% | 1 | 0.87% |
| Dominique Martinet | 2 | 0.02% | 1 | 0.87% |
| Jens Axboe | 2 | 0.02% | 1 | 0.87% |
| Linus Torvalds (pre-git) | 2 | 0.02% | 1 | 0.87% |
| Arvind Yadav | 2 | 0.02% | 2 | 1.74% |
| Jeremy Kerr | 2 | 0.02% | 1 | 0.87% |
| Uwe Kleine-König | 1 | 0.01% | 1 | 0.87% |
| Linus Torvalds | 1 | 0.01% | 1 | 0.87% |
| Dongsheng Yang | 1 | 0.01% | 1 | 0.87% |
| Total | 10446 | 115 |
// SPDX-License-Identifier: GPL-2.0-or-later /* ------------------------------------------------------------ * ibmvscsi.c * (C) Copyright IBM Corporation 1994, 2004 * Authors: Colin DeVilbiss (devilbis@us.ibm.com) * Santiago Leon (santil@us.ibm.com) * Dave Boutcher (sleddog@us.ibm.com) * * ------------------------------------------------------------ * Emulation of a SCSI host adapter for Virtual I/O devices * * This driver supports the SCSI adapter implemented by the IBM * Power5 firmware. That SCSI adapter is not a physical adapter, * but allows Linux SCSI peripheral drivers to directly * access devices in another logical partition on the physical system. * * The virtual adapter(s) are present in the open firmware device * tree just like real adapters. * * One of the capabilities provided on these systems is the ability * to DMA between partitions. The architecture states that for VSCSI, * the server side is allowed to DMA to and from the client. The client * is never trusted to DMA to or from the server directly. * * Messages are sent between partitions on a "Command/Response Queue" * (CRQ), which is just a buffer of 16 byte entries in the receiver's * Senders cannot access the buffer directly, but send messages by * making a hypervisor call and passing in the 16 bytes. The hypervisor * puts the message in the next 16 byte space in round-robin fashion, * turns on the high order bit of the message (the valid bit), and * generates an interrupt to the receiver (if interrupts are turned on.) * The receiver just turns off the valid bit when they have copied out * the message. * * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit * (IU) (as defined in the T10 standard available at www.t10.org), gets * a DMA address for the message, and sends it to the server as the * payload of a CRQ message. The server DMAs the SRP IU and processes it, * including doing any additional data transfers. When it is done, it * DMAs the SRP response back to the same address as the request came from, * and sends a CRQ message back to inform the client that the request has * completed. * * TODO: This is currently pretty tied to the IBM pSeries hypervisor * interfaces. It would be really nice to abstract this above an RDMA * layer. */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/dma-mapping.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/of.h> #include <linux/pm.h> #include <linux/kthread.h> #include <asm/firmware.h> #include <asm/vio.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_host.h> #include <scsi/scsi_device.h> #include <scsi/scsi_transport_srp.h> #include "ibmvscsi.h" /* The values below are somewhat arbitrary default values, but * OS/400 will use 3 busses (disks, CDs, tapes, I think.) * Note that there are 3 bits of channel value, 6 bits of id, and * 5 bits of LUN. */ static int max_id = 64; static int max_channel = 3; static int init_timeout = 300; static int login_timeout = 60; static int info_timeout = 30; static int abort_timeout = 60; static int reset_timeout = 60; static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; static int fast_fail = 1; static int client_reserve = 1; static char partition_name[96] = "UNKNOWN"; static unsigned int partition_number = -1; static LIST_HEAD(ibmvscsi_head); static DEFINE_SPINLOCK(ibmvscsi_driver_lock); static struct scsi_transport_template *ibmvscsi_transport_template; #define IBMVSCSI_VERSION "1.5.9" MODULE_DESCRIPTION("IBM Virtual SCSI"); MODULE_AUTHOR("Dave Boutcher"); MODULE_LICENSE("GPL"); MODULE_VERSION(IBMVSCSI_VERSION); module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]"); module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]"); module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); module_param_named(max_requests, max_requests, int, S_IRUGO); MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); module_param_named(client_reserve, client_reserve, int, S_IRUGO ); MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); static void ibmvscsi_handle_crq(struct viosrp_crq *crq, struct ibmvscsi_host_data *hostdata); /* ------------------------------------------------------------ * Routines for managing the command/response queue */ /** * ibmvscsi_handle_event: - Interrupt handler for crq events * @irq: number of irq to handle, not used * @dev_instance: ibmvscsi_host_data of host that received interrupt * * Disables interrupts and schedules srp_task * Always returns IRQ_HANDLED */ static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance) { struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)dev_instance; vio_disable_interrupts(to_vio_dev(hostdata->dev)); tasklet_schedule(&hostdata->srp_task); return IRQ_HANDLED; } /** * ibmvscsi_release_crq_queue() - Deallocates data and unregisters CRQ * @queue: crq_queue to initialize and register * @hostdata: ibmvscsi_host_data of host * @max_requests: maximum requests (unused) * * Frees irq, deallocates a page for messages, unmaps dma, and unregisters * the crq with the hypervisor. */ static void ibmvscsi_release_crq_queue(struct crq_queue *queue, struct ibmvscsi_host_data *hostdata, int max_requests) { long rc = 0; struct vio_dev *vdev = to_vio_dev(hostdata->dev); free_irq(vdev->irq, (void *)hostdata); tasklet_kill(&hostdata->srp_task); do { if (rc) msleep(100); rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); dma_unmap_single(hostdata->dev, queue->msg_token, queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); free_page((unsigned long)queue->msgs); } /** * crq_queue_next_crq: - Returns the next entry in message queue * @queue: crq_queue to use * * Returns pointer to next entry in queue, or NULL if there are no new * entried in the CRQ. */ static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) { struct viosrp_crq *crq; unsigned long flags; spin_lock_irqsave(&queue->lock, flags); crq = &queue->msgs[queue->cur]; if (crq->valid != VIOSRP_CRQ_FREE) { if (++queue->cur == queue->size) queue->cur = 0; /* Ensure the read of the valid bit occurs before reading any * other bits of the CRQ entry */ rmb(); } else crq = NULL; spin_unlock_irqrestore(&queue->lock, flags); return crq; } /** * ibmvscsi_send_crq: - Send a CRQ * @hostdata: the adapter * @word1: the first 64 bits of the data * @word2: the second 64 bits of the data */ static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2) { struct vio_dev *vdev = to_vio_dev(hostdata->dev); /* * Ensure the command buffer is flushed to memory before handing it * over to the VIOS to prevent it from fetching any stale data. */ mb(); return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); } /** * ibmvscsi_task: - Process srps asynchronously * @data: ibmvscsi_host_data of host */ static void ibmvscsi_task(void *data) { struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; struct vio_dev *vdev = to_vio_dev(hostdata->dev); struct viosrp_crq *crq; int done = 0; while (!done) { /* Pull all the valid messages off the CRQ */ while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { ibmvscsi_handle_crq(crq, hostdata); crq->valid = VIOSRP_CRQ_FREE; wmb(); } vio_enable_interrupts(vdev); crq = crq_queue_next_crq(&hostdata->queue); if (crq != NULL) { vio_disable_interrupts(vdev); ibmvscsi_handle_crq(crq, hostdata); crq->valid = VIOSRP_CRQ_FREE; wmb(); } else { done = 1; } } } static void gather_partition_info(void) { const char *ppartition_name; const __be32 *p_number_ptr; /* Retrieve information about this partition */ if (!of_root) return; of_node_get(of_root); ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL); if (ppartition_name) strlcpy(partition_name, ppartition_name, sizeof(partition_name)); p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL); if (p_number_ptr) partition_number = of_read_number(p_number_ptr, 1); of_node_put(of_root); } static void set_adapter_info(struct ibmvscsi_host_data *hostdata) { memset(&hostdata->madapter_info, 0x00, sizeof(hostdata->madapter_info)); dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); strncpy(hostdata->madapter_info.partition_name, partition_name, sizeof(hostdata->madapter_info.partition_name)); hostdata->madapter_info.partition_number = cpu_to_be32(partition_number); hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1); hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX); } /** * ibmvscsi_reset_crq_queue() - resets a crq after a failure * @queue: crq_queue to initialize and register * @hostdata: ibmvscsi_host_data of host */ static int ibmvscsi_reset_crq_queue(struct crq_queue *queue, struct ibmvscsi_host_data *hostdata) { int rc = 0; struct vio_dev *vdev = to_vio_dev(hostdata->dev); /* Close the CRQ */ do { if (rc) msleep(100); rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); /* Clean out the queue */ memset(queue->msgs, 0x00, PAGE_SIZE); queue->cur = 0; set_adapter_info(hostdata); /* And re-open it again */ rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, queue->msg_token, PAGE_SIZE); if (rc == H_CLOSED) { /* Adapter is good, but other end is not ready */ dev_warn(hostdata->dev, "Partner adapter not ready\n"); } else if (rc != 0) { dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); } return rc; } /** * ibmvscsi_init_crq_queue() - Initializes and registers CRQ with hypervisor * @queue: crq_queue to initialize and register * @hostdata: ibmvscsi_host_data of host * @max_requests: maximum requests (unused) * * Allocates a page for messages, maps it for dma, and registers * the crq with the hypervisor. * Returns zero on success. */ static int ibmvscsi_init_crq_queue(struct crq_queue *queue, struct ibmvscsi_host_data *hostdata, int max_requests) { int rc; int retrc; struct vio_dev *vdev = to_vio_dev(hostdata->dev); queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); if (!queue->msgs) goto malloc_failed; queue->size = PAGE_SIZE / sizeof(*queue->msgs); queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); if (dma_mapping_error(hostdata->dev, queue->msg_token)) goto map_failed; gather_partition_info(); set_adapter_info(hostdata); retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, queue->msg_token, PAGE_SIZE); if (rc == H_RESOURCE) /* maybe kexecing and resource is busy. try a reset */ rc = ibmvscsi_reset_crq_queue(queue, hostdata); if (rc == H_CLOSED) { /* Adapter is good, but other end is not ready */ dev_warn(hostdata->dev, "Partner adapter not ready\n"); retrc = 0; } else if (rc != 0) { dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); goto reg_crq_failed; } queue->cur = 0; spin_lock_init(&queue->lock); tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, (unsigned long)hostdata); if (request_irq(vdev->irq, ibmvscsi_handle_event, 0, "ibmvscsi", (void *)hostdata) != 0) { dev_err(hostdata->dev, "couldn't register irq 0x%x\n", vdev->irq); goto req_irq_failed; } rc = vio_enable_interrupts(vdev); if (rc != 0) { dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); goto req_irq_failed; } return retrc; req_irq_failed: tasklet_kill(&hostdata->srp_task); rc = 0; do { if (rc) msleep(100); rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); reg_crq_failed: dma_unmap_single(hostdata->dev, queue->msg_token, queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); map_failed: free_page((unsigned long)queue->msgs); malloc_failed: return -1; } /** * ibmvscsi_reenable_crq_queue() - reenables a crq after * @queue: crq_queue to initialize and register * @hostdata: ibmvscsi_host_data of host */ static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, struct ibmvscsi_host_data *hostdata) { int rc = 0; struct vio_dev *vdev = to_vio_dev(hostdata->dev); set_adapter_info(hostdata); /* Re-enable the CRQ */ do { if (rc) msleep(100); rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); if (rc) dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); return rc; } /* ------------------------------------------------------------ * Routines for the event pool and event structs */ /** * initialize_event_pool: - Allocates and initializes the event pool for a host * @pool: event_pool to be initialized * @size: Number of events in pool * @hostdata: ibmvscsi_host_data who owns the event pool * * Returns zero on success. */ static int initialize_event_pool(struct event_pool *pool, int size, struct ibmvscsi_host_data *hostdata) { int i; pool->size = size; pool->next = 0; pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); if (!pool->events) return -ENOMEM; pool->iu_storage = dma_alloc_coherent(hostdata->dev, pool->size * sizeof(*pool->iu_storage), &pool->iu_token, GFP_KERNEL); if (!pool->iu_storage) { kfree(pool->events); return -ENOMEM; } for (i = 0; i < pool->size; ++i) { struct srp_event_struct *evt = &pool->events[i]; memset(&evt->crq, 0x00, sizeof(evt->crq)); atomic_set(&evt->free, 1); evt->crq.valid = VIOSRP_CRQ_CMD_RSP; evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu)); evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token + sizeof(*evt->xfer_iu) * i); evt->xfer_iu = pool->iu_storage + i; evt->hostdata = hostdata; evt->ext_list = NULL; evt->ext_list_token = 0; } return 0; } /** * release_event_pool() - Frees memory of an event pool of a host * @pool: event_pool to be released * @hostdata: ibmvscsi_host_data who owns the even pool * * Returns zero on success. */ static void release_event_pool(struct event_pool *pool, struct ibmvscsi_host_data *hostdata) { int i, in_use = 0; for (i = 0; i < pool->size; ++i) { if (atomic_read(&pool->events[i].free) != 1) ++in_use; if (pool->events[i].ext_list) { dma_free_coherent(hostdata->dev, SG_ALL * sizeof(struct srp_direct_buf), pool->events[i].ext_list, pool->events[i].ext_list_token); } } if (in_use) dev_warn(hostdata->dev, "releasing event pool with %d " "events still in use?\n", in_use); kfree(pool->events); dma_free_coherent(hostdata->dev, pool->size * sizeof(*pool->iu_storage), pool->iu_storage, pool->iu_token); } /** * valid_event_struct: - Determines if event is valid. * @pool: event_pool that contains the event * @evt: srp_event_struct to be checked for validity * * Returns zero if event is invalid, one otherwise. */ static int valid_event_struct(struct event_pool *pool, struct srp_event_struct *evt) { int index = evt - pool->events; if (index < 0 || index >= pool->size) /* outside of bounds */ return 0; if (evt != pool->events + index) /* unaligned */ return 0; return 1; } /** * free_event_struct() - Changes status of event to "free" * @pool: event_pool that contains the event * @evt: srp_event_struct to be modified */ static void free_event_struct(struct event_pool *pool, struct srp_event_struct *evt) { if (!valid_event_struct(pool, evt)) { dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " "(not in pool %p)\n", evt, pool->events); return; } if (atomic_inc_return(&evt->free) != 1) { dev_err(evt->hostdata->dev, "Freeing event_struct %p " "which is not in use!\n", evt); return; } } /** * get_event_struct() - Gets the next free event in pool * @pool: event_pool that contains the events to be searched * * Returns the next event in "free" state, and NULL if none are free. * Note that no synchronization is done here, we assume the host_lock * will syncrhonze things. */ static struct srp_event_struct *get_event_struct(struct event_pool *pool) { int i; int poolsize = pool->size; int offset = pool->next; for (i = 0; i < poolsize; i++) { offset = (offset + 1) % poolsize; if (!atomic_dec_if_positive(&pool->events[offset].free)) { pool->next = offset; return &pool->events[offset]; } } printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); return NULL; } /** * init_event_struct: Initialize fields in an event struct that are always * required. * @evt_struct: The event * @done: Routine to call when the event is responded to * @format: SRP or MAD format * @timeout: timeout value set in the CRQ */ static void init_event_struct(struct srp_event_struct *evt_struct, void (*done) (struct srp_event_struct *), u8 format, int timeout) { evt_struct->cmnd = NULL; evt_struct->cmnd_done = NULL; evt_struct->sync_srp = NULL; evt_struct->crq.format = format; evt_struct->crq.timeout = cpu_to_be16(timeout); evt_struct->done = done; } /* ------------------------------------------------------------ * Routines for receiving SCSI responses from the hosting partition */ /* * set_srp_direction: Set the fields in the srp related to data * direction and number of buffers based on the direction in * the scsi_cmnd and the number of buffers */ static void set_srp_direction(struct scsi_cmnd *cmd, struct srp_cmd *srp_cmd, int numbuf) { u8 fmt; if (numbuf == 0) return; if (numbuf == 1) fmt = SRP_DATA_DESC_DIRECT; else { fmt = SRP_DATA_DESC_INDIRECT; numbuf = min(numbuf, MAX_INDIRECT_BUFS); if (cmd->sc_data_direction == DMA_TO_DEVICE) srp_cmd->data_out_desc_cnt = numbuf; else srp_cmd->data_in_desc_cnt = numbuf; } if (cmd->sc_data_direction == DMA_TO_DEVICE) srp_cmd->buf_fmt = fmt << 4; else srp_cmd->buf_fmt = fmt; } /** * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format * @cmd: srp_cmd whose additional_data member will be unmapped * @evt_struct: the event * @dev: device for which the memory is mapped */ static void unmap_cmd_data(struct srp_cmd *cmd, struct srp_event_struct *evt_struct, struct device *dev) { u8 out_fmt, in_fmt; out_fmt = cmd->buf_fmt >> 4; in_fmt = cmd->buf_fmt & ((1U << 4) - 1); if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) return; if (evt_struct->cmnd) scsi_dma_unmap(evt_struct->cmnd); } static int map_sg_list(struct scsi_cmnd *cmd, int nseg, struct srp_direct_buf *md) { int i; struct scatterlist *sg; u64 total_length = 0; scsi_for_each_sg(cmd, sg, nseg, i) { struct srp_direct_buf *descr = md + i; descr->va = cpu_to_be64(sg_dma_address(sg)); descr->len = cpu_to_be32(sg_dma_len(sg)); descr->key = 0; total_length += sg_dma_len(sg); } return total_length; } /** * map_sg_data: - Maps dma for a scatterlist and initializes descriptor fields * @cmd: struct scsi_cmnd with the scatterlist * @evt_struct: struct srp_event_struct to map * @srp_cmd: srp_cmd that contains the memory descriptor * @dev: device for which to map dma memory * * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. * Returns 1 on success. */ static int map_sg_data(struct scsi_cmnd *cmd, struct srp_event_struct *evt_struct, struct srp_cmd *srp_cmd, struct device *dev) { int sg_mapped; u64 total_length = 0; struct srp_direct_buf *data = (struct srp_direct_buf *) srp_cmd->add_data; struct srp_indirect_buf *indirect = (struct srp_indirect_buf *) data; sg_mapped = scsi_dma_map(cmd); if (!sg_mapped) return 1; else if (sg_mapped < 0) return 0; set_srp_direction(cmd, srp_cmd, sg_mapped); /* special case; we can use a single direct descriptor */ if (sg_mapped == 1) { map_sg_list(cmd, sg_mapped, data); return 1; } indirect->table_desc.va = 0; indirect->table_desc.len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf)); indirect->table_desc.key = 0; if (sg_mapped <= MAX_INDIRECT_BUFS) { total_length = map_sg_list(cmd, sg_mapped, &indirect->desc_list[0]); indirect->len = cpu_to_be32(total_length); return 1; } /* get indirect table */ if (!evt_struct->ext_list) { evt_struct->ext_list = dma_alloc_coherent(dev, SG_ALL * sizeof(struct srp_direct_buf), &evt_struct->ext_list_token, 0); if (!evt_struct->ext_list) { if (!firmware_has_feature(FW_FEATURE_CMO)) sdev_printk(KERN_ERR, cmd->device, "Can't allocate memory " "for indirect table\n"); scsi_dma_unmap(cmd); return 0; } } total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); indirect->len = cpu_to_be32(total_length); indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token); indirect->table_desc.len = cpu_to_be32(sg_mapped * sizeof(indirect->desc_list[0])); memcpy(indirect->desc_list, evt_struct->ext_list, MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); return 1; } /** * map_data_for_srp_cmd: - Calls functions to map data for srp cmds * @cmd: struct scsi_cmnd with the memory to be mapped * @evt_struct: struct srp_event_struct to map * @srp_cmd: srp_cmd that contains the memory descriptor * @dev: dma device for which to map dma memory * * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds * Returns 1 on success. */ static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, struct srp_event_struct *evt_struct, struct srp_cmd *srp_cmd, struct device *dev) { switch (cmd->sc_data_direction) { case DMA_FROM_DEVICE: case DMA_TO_DEVICE: break; case DMA_NONE: return 1; case DMA_BIDIRECTIONAL: sdev_printk(KERN_ERR, cmd->device, "Can't map DMA_BIDIRECTIONAL to read/write\n"); return 0; default: sdev_printk(KERN_ERR, cmd->device, "Unknown data direction 0x%02x; can't map!\n", cmd->sc_data_direction); return 0; } return map_sg_data(cmd, evt_struct, srp_cmd, dev); } /** * purge_requests: Our virtual adapter just shut down. purge any sent requests * @hostdata: the adapter * @error_code: error code to return as the 'result' */ static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) { struct srp_event_struct *evt; unsigned long flags; spin_lock_irqsave(hostdata->host->host_lock, flags); while (!list_empty(&hostdata->sent)) { evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); list_del(&evt->list); del_timer(&evt->timer); spin_unlock_irqrestore(hostdata->host->host_lock, flags); if (evt->cmnd) { evt->cmnd->result = (error_code << 16); unmap_cmd_data(&evt->iu.srp.cmd, evt, evt->hostdata->dev); if (evt->cmnd_done) evt->cmnd_done(evt->cmnd); } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT && evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ) evt->done(evt); free_event_struct(&evt->hostdata->pool, evt); spin_lock_irqsave(hostdata->host->host_lock, flags); } spin_unlock_irqrestore(hostdata->host->host_lock, flags); } /** * ibmvscsi_set_request_limit - Set the adapter request_limit in response to * an adapter failure, reset, or SRP Login. Done under host lock to prevent * race with SCSI command submission. * @hostdata: adapter to adjust * @limit: new request limit */ static void ibmvscsi_set_request_limit(struct ibmvscsi_host_data *hostdata, int limit) { unsigned long flags; spin_lock_irqsave(hostdata->host->host_lock, flags); atomic_set(&hostdata->request_limit, limit); spin_unlock_irqrestore(hostdata->host->host_lock, flags); } /** * ibmvscsi_reset_host - Reset the connection to the server * @hostdata: struct ibmvscsi_host_data to reset */ static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) { scsi_block_requests(hostdata->host); ibmvscsi_set_request_limit(hostdata, 0); purge_requests(hostdata, DID_ERROR); hostdata->action = IBMVSCSI_HOST_ACTION_RESET; wake_up(&hostdata->work_wait_q); } /** * ibmvscsi_timeout - Internal command timeout handler * @t: struct srp_event_struct that timed out * * Called when an internally generated command times out */ static void ibmvscsi_timeout(struct timer_list *t) { struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer); struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", evt_struct->iu.srp.cmd.opcode); ibmvscsi_reset_host(hostdata); } /* ------------------------------------------------------------ * Routines for sending and receiving SRPs */ /** * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() * @evt_struct: evt_struct to be sent * @hostdata: ibmvscsi_host_data of host * @timeout: timeout in seconds - 0 means do not time command * * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) * Note that this routine assumes that host_lock is held for synchronization */ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, struct ibmvscsi_host_data *hostdata, unsigned long timeout) { __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq; int request_status = 0; int rc; int srp_req = 0; /* If we have exhausted our request limit, just fail this request, * unless it is for a reset or abort. * Note that there are rare cases involving driver generated requests * (such as task management requests) that the mid layer may think we * can handle more requests (can_queue) when we actually can't */ if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { srp_req = 1; request_status = atomic_dec_if_positive(&hostdata->request_limit); /* If request limit was -1 when we started, it is now even * less than that */ if (request_status < -1) goto send_error; /* Otherwise, we may have run out of requests. */ /* If request limit was 0 when we started the adapter is in the * process of performing a login with the server adapter, or * we may have run out of requests. */ else if (request_status == -1 && evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) goto send_busy; /* Abort and reset calls should make it through. * Nothing except abort and reset should use the last two * slots unless we had two or less to begin with. */ else if (request_status < 2 && evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { /* In the case that we have less than two requests * available, check the server limit as a combination * of the request limit and the number of requests * in-flight (the size of the send list). If the * server limit is greater than 2, return busy so * that the last two are reserved for reset and abort. */ int server_limit = request_status; struct srp_event_struct *tmp_evt; list_for_each_entry(tmp_evt, &hostdata->sent, list) { server_limit++; } if (server_limit > 2) goto send_busy; } } /* Copy the IU into the transfer area */ *evt_struct->xfer_iu = evt_struct->iu; evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; /* Add this to the sent list. We need to do this * before we actually send * in case it comes back REALLY fast */ list_add_tail(&evt_struct->list, &hostdata->sent); timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0); if (timeout) { evt_struct->timer.expires = jiffies + (timeout * HZ); add_timer(&evt_struct->timer); } rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]), be64_to_cpu(crq_as_u64[1])); if (rc != 0) { list_del(&evt_struct->list); del_timer(&evt_struct->timer); /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. * Firmware will send a CRQ with a transport event (0xFF) to * tell this client what has happened to the transport. This * will be handled in ibmvscsi_handle_crq() */ if (rc == H_CLOSED) { dev_warn(hostdata->dev, "send warning. " "Receive queue closed, will retry.\n"); goto send_busy; } dev_err(hostdata->dev, "send error %d\n", rc); if (srp_req) atomic_inc(&hostdata->request_limit); goto send_error; } return 0; send_busy: unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); free_event_struct(&hostdata->pool, evt_struct); if (srp_req && request_status != -1) atomic_inc(&hostdata->request_limit); return SCSI_MLQUEUE_HOST_BUSY; send_error: unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); if (evt_struct->cmnd != NULL) { evt_struct->cmnd->result = DID_ERROR << 16; evt_struct->cmnd_done(evt_struct->cmnd); } else if (evt_struct->done) evt_struct->done(evt_struct); free_event_struct(&hostdata->pool, evt_struct); return 0; } /** * handle_cmd_rsp: - Handle responses from commands * @evt_struct: srp_event_struct to be handled * * Used as a callback by when sending scsi cmds. * Gets called by ibmvscsi_handle_crq() */ static void handle_cmd_rsp(struct srp_event_struct *evt_struct) { struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; struct scsi_cmnd *cmnd = evt_struct->cmnd; if (unlikely(rsp->opcode != SRP_RSP)) { if (printk_ratelimit()) dev_warn(evt_struct->hostdata->dev, "bad SRP RSP type %#02x\n", rsp->opcode); } if (cmnd) { cmnd->result |= rsp->status; if (scsi_status_is_check_condition(cmnd->result)) memcpy(cmnd->sense_buffer, rsp->data, be32_to_cpu(rsp->sense_data_len)); unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, evt_struct->hostdata->dev); if (rsp->flags & SRP_RSP_FLAG_DOOVER) scsi_set_resid(cmnd, be32_to_cpu(rsp->data_out_res_cnt)); else if (rsp->flags & SRP_RSP_FLAG_DIOVER) scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt)); } if (evt_struct->cmnd_done) evt_struct->cmnd_done(cmnd); } /** * lun_from_dev: - Returns the lun of the scsi device * @dev: struct scsi_device * */ static inline u16 lun_from_dev(struct scsi_device *dev) { return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; } /** * ibmvscsi_queuecommand_lck() - The queuecommand function of the scsi template * @cmnd: struct scsi_cmnd to be executed * @done: Callback function to be called when cmd is completed */ static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd) { void (*done)(struct scsi_cmnd *) = scsi_done; struct srp_cmd *srp_cmd; struct srp_event_struct *evt_struct; struct srp_indirect_buf *indirect; struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); u16 lun = lun_from_dev(cmnd->device); u8 out_fmt, in_fmt; cmnd->result = (DID_OK << 16); evt_struct = get_event_struct(&hostdata->pool); if (!evt_struct) return SCSI_MLQUEUE_HOST_BUSY; /* Set up the actual SRP IU */ BUILD_BUG_ON(sizeof(evt_struct->iu.srp) != SRP_MAX_IU_LEN); memset(&evt_struct->iu.srp, 0x00, sizeof(evt_struct->iu.srp)); srp_cmd = &evt_struct->iu.srp.cmd; srp_cmd->opcode = SRP_CMD; memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); int_to_scsilun(lun, &srp_cmd->lun); if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { if (!firmware_has_feature(FW_FEATURE_CMO)) sdev_printk(KERN_ERR, cmnd->device, "couldn't convert cmd to srp_cmd\n"); free_event_struct(&hostdata->pool, evt_struct); return SCSI_MLQUEUE_HOST_BUSY; } init_event_struct(evt_struct, handle_cmd_rsp, VIOSRP_SRP_FORMAT, scsi_cmd_to_rq(cmnd)->timeout / HZ); evt_struct->cmnd = cmnd; evt_struct->cmnd_done = done; /* Fix up dma address of the buffer itself */ indirect = (struct srp_indirect_buf *) srp_cmd->add_data; out_fmt = srp_cmd->buf_fmt >> 4; in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); if ((in_fmt == SRP_DATA_DESC_INDIRECT || out_fmt == SRP_DATA_DESC_INDIRECT) && indirect->table_desc.va == 0) { indirect->table_desc.va = cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) + offsetof(struct srp_cmd, add_data) + offsetof(struct srp_indirect_buf, desc_list)); } return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); } static DEF_SCSI_QCMD(ibmvscsi_queuecommand) /* ------------------------------------------------------------ * Routines for driver initialization */ /** * map_persist_bufs: - Pre-map persistent data for adapter logins * @hostdata: ibmvscsi_host_data of host * * Map the capabilities and adapter info DMA buffers to avoid runtime failures. * Return 1 on error, 0 on success. */ static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) { hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, sizeof(hostdata->caps), DMA_BIDIRECTIONAL); if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); return 1; } hostdata->adapter_info_addr = dma_map_single(hostdata->dev, &hostdata->madapter_info, sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); dma_unmap_single(hostdata->dev, hostdata->caps_addr, sizeof(hostdata->caps), DMA_BIDIRECTIONAL); return 1; } return 0; } /** * unmap_persist_bufs: - Unmap persistent data needed for adapter logins * @hostdata: ibmvscsi_host_data of host * * Unmap the capabilities and adapter info DMA buffers */ static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) { dma_unmap_single(hostdata->dev, hostdata->caps_addr, sizeof(hostdata->caps), DMA_BIDIRECTIONAL); dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); } /** * login_rsp: - Handle response to SRP login request * @evt_struct: srp_event_struct with the response * * Used as a "done" callback by when sending srp_login. Gets called * by ibmvscsi_handle_crq() */ static void login_rsp(struct srp_event_struct *evt_struct) { struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { case SRP_LOGIN_RSP: /* it worked! */ break; case SRP_LOGIN_REJ: /* refused! */ dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", evt_struct->xfer_iu->srp.login_rej.reason); /* Login failed. */ ibmvscsi_set_request_limit(hostdata, -1); return; default: dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", evt_struct->xfer_iu->srp.login_rsp.opcode); /* Login failed. */ ibmvscsi_set_request_limit(hostdata, -1); return; } dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); hostdata->client_migrated = 0; /* Now we know what the real request-limit is. * This value is set rather than added to request_limit because * request_limit could have been set to -1 by this client. */ ibmvscsi_set_request_limit(hostdata, be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta)); /* If we had any pending I/Os, kick them */ hostdata->action = IBMVSCSI_HOST_ACTION_UNBLOCK; wake_up(&hostdata->work_wait_q); } /** * send_srp_login: - Sends the srp login * @hostdata: ibmvscsi_host_data of host * * Returns zero if successful. */ static int send_srp_login(struct ibmvscsi_host_data *hostdata) { int rc; unsigned long flags; struct srp_login_req *login; struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); BUG_ON(!evt_struct); init_event_struct(evt_struct, login_rsp, VIOSRP_SRP_FORMAT, login_timeout); login = &evt_struct->iu.srp.login_req; memset(login, 0, sizeof(*login)); login->opcode = SRP_LOGIN_REQ; login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu)); login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT); /* Start out with a request limit of 0, since this is negotiated in * the login request we are just sending and login requests always * get sent by the driver regardless of request_limit. */ ibmvscsi_set_request_limit(hostdata, 0); spin_lock_irqsave(hostdata->host->host_lock, flags); rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); spin_unlock_irqrestore(hostdata->host->host_lock, flags); dev_info(hostdata->dev, "sent SRP login\n"); return rc; }; /** * capabilities_rsp: - Handle response to MAD adapter capabilities request * @evt_struct: srp_event_struct with the response * * Used as a "done" callback by when sending adapter_info. */ static void capabilities_rsp(struct srp_event_struct *evt_struct) { struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; if (evt_struct->xfer_iu->mad.capabilities.common.status) { dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", evt_struct->xfer_iu->mad.capabilities.common.status); } else { if (hostdata->caps.migration.common.server_support != cpu_to_be16(SERVER_SUPPORTS_CAP)) dev_info(hostdata->dev, "Partition migration not supported\n"); if (client_reserve) { if (hostdata->caps.reserve.common.server_support == cpu_to_be16(SERVER_SUPPORTS_CAP)) dev_info(hostdata->dev, "Client reserve enabled\n"); else dev_info(hostdata->dev, "Client reserve not supported\n"); } } send_srp_login(hostdata); } /** * send_mad_capabilities: - Sends the mad capabilities request * and stores the result so it can be retrieved with * @hostdata: ibmvscsi_host_data of host */ static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) { struct viosrp_capabilities *req; struct srp_event_struct *evt_struct; unsigned long flags; struct device_node *of_node = hostdata->dev->of_node; const char *location; evt_struct = get_event_struct(&hostdata->pool); BUG_ON(!evt_struct); init_event_struct(evt_struct, capabilities_rsp, VIOSRP_MAD_FORMAT, info_timeout); req = &evt_struct->iu.mad.capabilities; memset(req, 0, sizeof(*req)); hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED); if (hostdata->client_migrated) hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED); strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), sizeof(hostdata->caps.name)); location = of_get_property(of_node, "ibm,loc-code", NULL); location = location ? location : dev_name(hostdata->dev); strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE); req->buffer = cpu_to_be64(hostdata->caps_addr); hostdata->caps.migration.common.cap_type = cpu_to_be32(MIGRATION_CAPABILITIES); hostdata->caps.migration.common.length = cpu_to_be16(sizeof(hostdata->caps.migration)); hostdata->caps.migration.common.server_support = cpu_to_be16(SERVER_SUPPORTS_CAP); hostdata->caps.migration.ecl = cpu_to_be32(1); if (client_reserve) { hostdata->caps.reserve.common.cap_type = cpu_to_be32(RESERVATION_CAPABILITIES); hostdata->caps.reserve.common.length = cpu_to_be16(sizeof(hostdata->caps.reserve)); hostdata->caps.reserve.common.server_support = cpu_to_be16(SERVER_SUPPORTS_CAP); hostdata->caps.reserve.type = cpu_to_be32(CLIENT_RESERVE_SCSI_2); req->common.length = cpu_to_be16(sizeof(hostdata->caps)); } else req->common.length = cpu_to_be16(sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve)); spin_lock_irqsave(hostdata->host->host_lock, flags); if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); spin_unlock_irqrestore(hostdata->host->host_lock, flags); }; /** * fast_fail_rsp: - Handle response to MAD enable fast fail * @evt_struct: srp_event_struct with the response * * Used as a "done" callback by when sending enable fast fail. Gets called * by ibmvscsi_handle_crq() */ static void fast_fail_rsp(struct srp_event_struct *evt_struct) { struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status); if (status == VIOSRP_MAD_NOT_SUPPORTED) dev_err(hostdata->dev, "fast_fail not supported in server\n"); else if (status == VIOSRP_MAD_FAILED) dev_err(hostdata->dev, "fast_fail request failed\n"); else if (status != VIOSRP_MAD_SUCCESS) dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); send_mad_capabilities(hostdata); } /** * enable_fast_fail() - Start host initialization * @hostdata: ibmvscsi_host_data of host * * Returns zero if successful. */ static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) { int rc; unsigned long flags; struct viosrp_fast_fail *fast_fail_mad; struct srp_event_struct *evt_struct; if (!fast_fail) { send_mad_capabilities(hostdata); return 0; } evt_struct = get_event_struct(&hostdata->pool); BUG_ON(!evt_struct); init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); fast_fail_mad = &evt_struct->iu.mad.fast_fail; memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL); fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad)); spin_lock_irqsave(hostdata->host->host_lock, flags); rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); spin_unlock_irqrestore(hostdata->host->host_lock, flags); return rc; } /** * adapter_info_rsp: - Handle response to MAD adapter info request * @evt_struct: srp_event_struct with the response * * Used as a "done" callback by when sending adapter_info. Gets called * by ibmvscsi_handle_crq() */ static void adapter_info_rsp(struct srp_event_struct *evt_struct) { struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; if (evt_struct->xfer_iu->mad.adapter_info.common.status) { dev_err(hostdata->dev, "error %d getting adapter info\n", evt_struct->xfer_iu->mad.adapter_info.common.status); } else { dev_info(hostdata->dev, "host srp version: %s, " "host partition %s (%d), OS %d, max io %u\n", hostdata->madapter_info.srp_version, hostdata->madapter_info.partition_name, be32_to_cpu(hostdata->madapter_info.partition_number), be32_to_cpu(hostdata->madapter_info.os_type), be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); if (hostdata->madapter_info.port_max_txu[0]) hostdata->host->max_sectors = be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9; if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX && strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", hostdata->madapter_info.srp_version); dev_err(hostdata->dev, "limiting scatterlists to %d\n", MAX_INDIRECT_BUFS); hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; } if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) { enable_fast_fail(hostdata); return; } } send_srp_login(hostdata); } /** * send_mad_adapter_info: - Sends the mad adapter info request * and stores the result so it can be retrieved with * sysfs. We COULD consider causing a failure if the * returned SRP version doesn't match ours. * @hostdata: ibmvscsi_host_data of host * * Returns zero if successful. */ static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) { struct viosrp_adapter_info *req; struct srp_event_struct *evt_struct; unsigned long flags; evt_struct = get_event_struct(&hostdata->pool); BUG_ON(!evt_struct); init_event_struct(evt_struct, adapter_info_rsp, VIOSRP_MAD_FORMAT, info_timeout); req = &evt_struct->iu.mad.adapter_info; memset(req, 0x00, sizeof(*req)); req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE); req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info)); req->buffer = cpu_to_be64(hostdata->adapter_info_addr); spin_lock_irqsave(hostdata->host->host_lock, flags); if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); spin_unlock_irqrestore(hostdata->host->host_lock, flags); }; /* * init_adapter() - Start virtual adapter initialization sequence */ static void init_adapter(struct ibmvscsi_host_data *hostdata) { send_mad_adapter_info(hostdata); } /* * sync_completion: Signal that a synchronous command has completed * Note that after returning from this call, the evt_struct is freed. * the caller waiting on this completion shouldn't touch the evt_struct * again. */ static void sync_completion(struct srp_event_struct *evt_struct) { /* copy the response back */ if (evt_struct->sync_srp) *evt_struct->sync_srp = *evt_struct->xfer_iu; complete(&evt_struct->comp); } /* * ibmvscsi_eh_abort_handler: Abort a command...from scsi host template * send this over to the server and wait synchronously for the response */ static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) { struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); struct srp_tsk_mgmt *tsk_mgmt; struct srp_event_struct *evt; struct srp_event_struct *tmp_evt, *found_evt; union viosrp_iu srp_rsp; int rsp_rc; unsigned long flags; u16 lun = lun_from_dev(cmd->device); unsigned long wait_switch = 0; /* First, find this command in our sent list so we can figure * out the correct tag */ spin_lock_irqsave(hostdata->host->host_lock, flags); wait_switch = jiffies + (init_timeout * HZ); do { found_evt = NULL; list_for_each_entry(tmp_evt, &hostdata->sent, list) { if (tmp_evt->cmnd == cmd) { found_evt = tmp_evt; break; } } if (!found_evt) { spin_unlock_irqrestore(hostdata->host->host_lock, flags); return SUCCESS; } evt = get_event_struct(&hostdata->pool); if (evt == NULL) { spin_unlock_irqrestore(hostdata->host->host_lock, flags); sdev_printk(KERN_ERR, cmd->device, "failed to allocate abort event\n"); return FAILED; } init_event_struct(evt, sync_completion, VIOSRP_SRP_FORMAT, abort_timeout); tsk_mgmt = &evt->iu.srp.tsk_mgmt; /* Set up an abort SRP command */ memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); tsk_mgmt->opcode = SRP_TSK_MGMT; int_to_scsilun(lun, &tsk_mgmt->lun); tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; tsk_mgmt->task_tag = (u64) found_evt; evt->sync_srp = &srp_rsp; init_completion(&evt->comp); rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) break; spin_unlock_irqrestore(hostdata->host->host_lock, flags); msleep(10); spin_lock_irqsave(hostdata->host->host_lock, flags); } while (time_before(jiffies, wait_switch)); spin_unlock_irqrestore(hostdata->host->host_lock, flags); if (rsp_rc != 0) { sdev_printk(KERN_ERR, cmd->device, "failed to send abort() event. rc=%d\n", rsp_rc); return FAILED; } sdev_printk(KERN_INFO, cmd->device, "aborting command. lun 0x%llx, tag 0x%llx\n", (((u64) lun) << 48), (u64) found_evt); wait_for_completion(&evt->comp); /* make sure we got a good response */ if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { if (printk_ratelimit()) sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", srp_rsp.srp.rsp.opcode); return FAILED; } if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) rsp_rc = *((int *)srp_rsp.srp.rsp.data); else rsp_rc = srp_rsp.srp.rsp.status; if (rsp_rc) { if (printk_ratelimit()) sdev_printk(KERN_WARNING, cmd->device, "abort code %d for task tag 0x%llx\n", rsp_rc, tsk_mgmt->task_tag); return FAILED; } /* Because we dropped the spinlock above, it's possible * The event is no longer in our list. Make sure it didn't * complete while we were aborting */ spin_lock_irqsave(hostdata->host->host_lock, flags); found_evt = NULL; list_for_each_entry(tmp_evt, &hostdata->sent, list) { if (tmp_evt->cmnd == cmd) { found_evt = tmp_evt; break; } } if (found_evt == NULL) { spin_unlock_irqrestore(hostdata->host->host_lock, flags); sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", tsk_mgmt->task_tag); return SUCCESS; } sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", tsk_mgmt->task_tag); cmd->result = (DID_ABORT << 16); list_del(&found_evt->list); unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, found_evt->hostdata->dev); free_event_struct(&found_evt->hostdata->pool, found_evt); spin_unlock_irqrestore(hostdata->host->host_lock, flags); atomic_inc(&hostdata->request_limit); return SUCCESS; } /* * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host * template send this over to the server and wait synchronously for the * response */ static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) { struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); struct srp_tsk_mgmt *tsk_mgmt; struct srp_event_struct *evt; struct srp_event_struct *tmp_evt, *pos; union viosrp_iu srp_rsp; int rsp_rc; unsigned long flags; u16 lun = lun_from_dev(cmd->device); unsigned long wait_switch = 0; spin_lock_irqsave(hostdata->host->host_lock, flags); wait_switch = jiffies + (init_timeout * HZ); do { evt = get_event_struct(&hostdata->pool); if (evt == NULL) { spin_unlock_irqrestore(hostdata->host->host_lock, flags); sdev_printk(KERN_ERR, cmd->device, "failed to allocate reset event\n"); return FAILED; } init_event_struct(evt, sync_completion, VIOSRP_SRP_FORMAT, reset_timeout); tsk_mgmt = &evt->iu.srp.tsk_mgmt; /* Set up a lun reset SRP command */ memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); tsk_mgmt->opcode = SRP_TSK_MGMT; int_to_scsilun(lun, &tsk_mgmt->lun); tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; evt->sync_srp = &srp_rsp; init_completion(&evt->comp); rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) break; spin_unlock_irqrestore(hostdata->host->host_lock, flags); msleep(10); spin_lock_irqsave(hostdata->host->host_lock, flags); } while (time_before(jiffies, wait_switch)); spin_unlock_irqrestore(hostdata->host->host_lock, flags); if (rsp_rc != 0) { sdev_printk(KERN_ERR, cmd->device, "failed to send reset event. rc=%d\n", rsp_rc); return FAILED; } sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", (((u64) lun) << 48)); wait_for_completion(&evt->comp); /* make sure we got a good response */ if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { if (printk_ratelimit()) sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", srp_rsp.srp.rsp.opcode); return FAILED; } if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) rsp_rc = *((int *)srp_rsp.srp.rsp.data); else rsp_rc = srp_rsp.srp.rsp.status; if (rsp_rc) { if (printk_ratelimit()) sdev_printk(KERN_WARNING, cmd->device, "reset code %d for task tag 0x%llx\n", rsp_rc, tsk_mgmt->task_tag); return FAILED; } /* We need to find all commands for this LUN that have not yet been * responded to, and fail them with DID_RESET */ spin_lock_irqsave(hostdata->host->host_lock, flags); list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { if (tmp_evt->cmnd) tmp_evt->cmnd->result = (DID_RESET << 16); list_del(&tmp_evt->list); unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, tmp_evt->hostdata->dev); free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); atomic_inc(&hostdata->request_limit); if (tmp_evt->cmnd_done) tmp_evt->cmnd_done(tmp_evt->cmnd); else if (tmp_evt->done) tmp_evt->done(tmp_evt); } } spin_unlock_irqrestore(hostdata->host->host_lock, flags); return SUCCESS; } /** * ibmvscsi_eh_host_reset_handler - Reset the connection to the server * @cmd: struct scsi_cmnd having problems */ static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) { unsigned long wait_switch = 0; struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); ibmvscsi_reset_host(hostdata); for (wait_switch = jiffies + (init_timeout * HZ); time_before(jiffies, wait_switch) && atomic_read(&hostdata->request_limit) < 2;) { msleep(10); } if (atomic_read(&hostdata->request_limit) <= 0) return FAILED; return SUCCESS; } /** * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ * @crq: Command/Response queue * @hostdata: ibmvscsi_host_data of host * */ static void ibmvscsi_handle_crq(struct viosrp_crq *crq, struct ibmvscsi_host_data *hostdata) { long rc; unsigned long flags; /* The hypervisor copies our tag value here so no byteswapping */ struct srp_event_struct *evt_struct = (__force struct srp_event_struct *)crq->IU_data_ptr; switch (crq->valid) { case VIOSRP_CRQ_INIT_RSP: /* initialization */ switch (crq->format) { case VIOSRP_CRQ_INIT: /* Initialization message */ dev_info(hostdata->dev, "partner initialized\n"); /* Send back a response */ rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0); if (rc == 0) { /* Now login */ init_adapter(hostdata); } else { dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); } break; case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */ dev_info(hostdata->dev, "partner initialization complete\n"); /* Now login */ init_adapter(hostdata); break; default: dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); } return; case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */ scsi_block_requests(hostdata->host); ibmvscsi_set_request_limit(hostdata, 0); if (crq->format == 0x06) { /* We need to re-setup the interpartition connection */ dev_info(hostdata->dev, "Re-enabling adapter!\n"); hostdata->client_migrated = 1; hostdata->action = IBMVSCSI_HOST_ACTION_REENABLE; purge_requests(hostdata, DID_REQUEUE); wake_up(&hostdata->work_wait_q); } else { dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", crq->format); ibmvscsi_reset_host(hostdata); } return; case VIOSRP_CRQ_CMD_RSP: /* real payload */ break; default: dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", crq->valid); return; } /* The only kind of payload CRQs we should get are responses to * things we send. Make sure this response is to something we * actually sent */ if (!valid_event_struct(&hostdata->pool, evt_struct)) { dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", evt_struct); return; } if (atomic_read(&evt_struct->free)) { dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", evt_struct); return; } if (crq->format == VIOSRP_SRP_FORMAT) atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta), &hostdata->request_limit); del_timer(&evt_struct->timer); if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) evt_struct->cmnd->result = DID_ERROR << 16; if (evt_struct->done) evt_struct->done(evt_struct); else dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); /* * Lock the host_lock before messing with these structures, since we * are running in a task context */ spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); list_del(&evt_struct->list); free_event_struct(&evt_struct->hostdata->pool, evt_struct); spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); } /** * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. * @sdev: struct scsi_device device to configure * * Enable allow_restart for a device if it is a disk. Adjust the * queue_depth here also as is required by the documentation for * struct scsi_host_template. */ static int ibmvscsi_slave_configure(struct scsi_device *sdev) { struct Scsi_Host *shost = sdev->host; unsigned long lock_flags = 0; spin_lock_irqsave(shost->host_lock, lock_flags); if (sdev->type == TYPE_DISK) { sdev->allow_restart = 1; blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); } spin_unlock_irqrestore(shost->host_lock, lock_flags); return 0; } /** * ibmvscsi_change_queue_depth - Change the device's queue depth * @sdev: scsi device struct * @qdepth: depth to set * * Return value: * actual depth set **/ static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) { if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; return scsi_change_queue_depth(sdev, qdepth); } /* ------------------------------------------------------------ * sysfs attributes */ static ssize_t show_host_vhost_loc(struct device *dev, struct device_attribute *attr, char *buf) { struct Scsi_Host *shost = class_to_shost(dev); struct ibmvscsi_host_data *hostdata = shost_priv(shost); int len; len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", hostdata->caps.loc); return len; } static struct device_attribute ibmvscsi_host_vhost_loc = { .attr = { .name = "vhost_loc", .mode = S_IRUGO, }, .show = show_host_vhost_loc, }; static ssize_t show_host_vhost_name(struct device *dev, struct device_attribute *attr, char *buf) { struct Scsi_Host *shost = class_to_shost(dev); struct ibmvscsi_host_data *hostdata = shost_priv(shost); int len; len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", hostdata->caps.name); return len; } static struct device_attribute ibmvscsi_host_vhost_name = { .attr = { .name = "vhost_name", .mode = S_IRUGO, }, .show = show_host_vhost_name, }; static ssize_t show_host_srp_version(struct device *dev, struct device_attribute *attr, char *buf) { struct Scsi_Host *shost = class_to_shost(dev); struct ibmvscsi_host_data *hostdata = shost_priv(shost); int len; len = snprintf(buf, PAGE_SIZE, "%s\n", hostdata->madapter_info.srp_version); return len; } static struct device_attribute ibmvscsi_host_srp_version = { .attr = { .name = "srp_version", .mode = S_IRUGO, }, .show = show_host_srp_version, }; static ssize_t show_host_partition_name(struct device *dev, struct device_attribute *attr, char *buf) { struct Scsi_Host *shost = class_to_shost(dev); struct ibmvscsi_host_data *hostdata = shost_priv(shost); int len; len = snprintf(buf, PAGE_SIZE, "%s\n", hostdata->madapter_info.partition_name); return len; } static struct device_attribute ibmvscsi_host_partition_name = { .attr = { .name = "partition_name", .mode = S_IRUGO, }, .show = show_host_partition_name, }; static ssize_t show_host_partition_number(struct device *dev, struct device_attribute *attr, char *buf) { struct Scsi_Host *shost = class_to_shost(dev); struct ibmvscsi_host_data *hostdata = shost_priv(shost); int len; len = snprintf(buf, PAGE_SIZE, "%d\n", be32_to_cpu(hostdata->madapter_info.partition_number)); return len; } static struct device_attribute ibmvscsi_host_partition_number = { .attr = { .name = "partition_number", .mode = S_IRUGO, }, .show = show_host_partition_number, }; static ssize_t show_host_mad_version(struct device *dev, struct device_attribute *attr, char *buf) { struct Scsi_Host *shost = class_to_shost(dev); struct ibmvscsi_host_data *hostdata = shost_priv(shost); int len; len = snprintf(buf, PAGE_SIZE, "%d\n", be32_to_cpu(hostdata->madapter_info.mad_version)); return len; } static struct device_attribute ibmvscsi_host_mad_version = { .attr = { .name = "mad_version", .mode = S_IRUGO, }, .show = show_host_mad_version, }; static ssize_t show_host_os_type(struct device *dev, struct device_attribute *attr, char *buf) { struct Scsi_Host *shost = class_to_shost(dev); struct ibmvscsi_host_data *hostdata = shost_priv(shost); int len; len = snprintf(buf, PAGE_SIZE, "%d\n", be32_to_cpu(hostdata->madapter_info.os_type)); return len; } static struct device_attribute ibmvscsi_host_os_type = { .attr = { .name = "os_type", .mode = S_IRUGO, }, .show = show_host_os_type, }; static ssize_t show_host_config(struct device *dev, struct device_attribute *attr, char *buf) { return 0; } static struct device_attribute ibmvscsi_host_config = { .attr = { .name = "config", .mode = S_IRUGO, }, .show = show_host_config, }; static int ibmvscsi_host_reset(struct Scsi_Host *shost, int reset_type) { struct ibmvscsi_host_data *hostdata = shost_priv(shost); dev_info(hostdata->dev, "Initiating adapter reset!\n"); ibmvscsi_reset_host(hostdata); return 0; } static struct attribute *ibmvscsi_host_attrs[] = { &ibmvscsi_host_vhost_loc.attr, &ibmvscsi_host_vhost_name.attr, &ibmvscsi_host_srp_version.attr, &ibmvscsi_host_partition_name.attr, &ibmvscsi_host_partition_number.attr, &ibmvscsi_host_mad_version.attr, &ibmvscsi_host_os_type.attr, &ibmvscsi_host_config.attr, NULL }; ATTRIBUTE_GROUPS(ibmvscsi_host); /* ------------------------------------------------------------ * SCSI driver registration */ static struct scsi_host_template driver_template = { .module = THIS_MODULE, .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, .proc_name = "ibmvscsi", .queuecommand = ibmvscsi_queuecommand, .eh_timed_out = srp_timed_out, .eh_abort_handler = ibmvscsi_eh_abort_handler, .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, .slave_configure = ibmvscsi_slave_configure, .change_queue_depth = ibmvscsi_change_queue_depth, .host_reset = ibmvscsi_host_reset, .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, .this_id = -1, .sg_tablesize = SG_ALL, .shost_groups = ibmvscsi_host_groups, }; /** * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver * * @vdev: struct vio_dev for the device whose desired IO mem is to be returned * * Return value: * Number of bytes of IO data the driver will need to perform well. */ static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) { /* iu_storage data allocated in initialize_event_pool */ unsigned long desired_io = max_events * sizeof(union viosrp_iu); /* add io space for sg data */ desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * IBMVSCSI_CMDS_PER_LUN_DEFAULT); return desired_io; } static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) { unsigned long flags; int rc; char *action = "reset"; spin_lock_irqsave(hostdata->host->host_lock, flags); switch (hostdata->action) { case IBMVSCSI_HOST_ACTION_UNBLOCK: rc = 0; break; case IBMVSCSI_HOST_ACTION_RESET: spin_unlock_irqrestore(hostdata->host->host_lock, flags); rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); spin_lock_irqsave(hostdata->host->host_lock, flags); if (!rc) rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); vio_enable_interrupts(to_vio_dev(hostdata->dev)); break; case IBMVSCSI_HOST_ACTION_REENABLE: action = "enable"; spin_unlock_irqrestore(hostdata->host->host_lock, flags); rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); spin_lock_irqsave(hostdata->host->host_lock, flags); if (!rc) rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); break; case IBMVSCSI_HOST_ACTION_NONE: default: spin_unlock_irqrestore(hostdata->host->host_lock, flags); return; } hostdata->action = IBMVSCSI_HOST_ACTION_NONE; spin_unlock_irqrestore(hostdata->host->host_lock, flags); if (rc) { ibmvscsi_set_request_limit(hostdata, -1); dev_err(hostdata->dev, "error after %s\n", action); } scsi_unblock_requests(hostdata->host); } static int __ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) { if (kthread_should_stop()) return 1; switch (hostdata->action) { case IBMVSCSI_HOST_ACTION_NONE: return 0; case IBMVSCSI_HOST_ACTION_RESET: case IBMVSCSI_HOST_ACTION_REENABLE: case IBMVSCSI_HOST_ACTION_UNBLOCK: default: break; } return 1; } static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) { unsigned long flags; int rc; spin_lock_irqsave(hostdata->host->host_lock, flags); rc = __ibmvscsi_work_to_do(hostdata); spin_unlock_irqrestore(hostdata->host->host_lock, flags); return rc; } static int ibmvscsi_work(void *data) { struct ibmvscsi_host_data *hostdata = data; int rc; set_user_nice(current, MIN_NICE); while (1) { rc = wait_event_interruptible(hostdata->work_wait_q, ibmvscsi_work_to_do(hostdata)); BUG_ON(rc); if (kthread_should_stop()) break; ibmvscsi_do_work(hostdata); } return 0; } /* * Called by bus code for each adapter */ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) { struct ibmvscsi_host_data *hostdata; struct Scsi_Host *host; struct device *dev = &vdev->dev; struct srp_rport_identifiers ids; struct srp_rport *rport; unsigned long wait_switch = 0; int rc; dev_set_drvdata(&vdev->dev, NULL); host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); if (!host) { dev_err(&vdev->dev, "couldn't allocate host data\n"); goto scsi_host_alloc_failed; } host->transportt = ibmvscsi_transport_template; hostdata = shost_priv(host); memset(hostdata, 0x00, sizeof(*hostdata)); INIT_LIST_HEAD(&hostdata->sent); init_waitqueue_head(&hostdata->work_wait_q); hostdata->host = host; hostdata->dev = dev; ibmvscsi_set_request_limit(hostdata, -1); hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; if (map_persist_bufs(hostdata)) { dev_err(&vdev->dev, "couldn't map persistent buffers\n"); goto persist_bufs_failed; } hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", "ibmvscsi", host->host_no); if (IS_ERR(hostdata->work_thread)) { dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", PTR_ERR(hostdata->work_thread)); goto init_crq_failed; } rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events); if (rc != 0 && rc != H_RESOURCE) { dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); goto kill_kthread; } if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { dev_err(&vdev->dev, "couldn't initialize event pool\n"); goto init_pool_failed; } host->max_lun = IBMVSCSI_MAX_LUN; host->max_id = max_id; host->max_channel = max_channel; host->max_cmd_len = 16; dev_info(dev, "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n", host->max_id, host->max_lun, host->max_channel); if (scsi_add_host(hostdata->host, hostdata->dev)) goto add_host_failed; /* we don't have a proper target_port_id so let's use the fake one */ memcpy(ids.port_id, hostdata->madapter_info.partition_name, sizeof(ids.port_id)); ids.roles = SRP_RPORT_ROLE_TARGET; rport = srp_rport_add(host, &ids); if (IS_ERR(rport)) goto add_srp_port_failed; /* Try to send an initialization message. Note that this is allowed * to fail if the other end is not acive. In that case we don't * want to scan */ if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 || rc == H_RESOURCE) { /* * Wait around max init_timeout secs for the adapter to finish * initializing. When we are done initializing, we will have a * valid request_limit. We don't want Linux scanning before * we are ready. */ for (wait_switch = jiffies + (init_timeout * HZ); time_before(jiffies, wait_switch) && atomic_read(&hostdata->request_limit) < 2;) { msleep(10); } /* if we now have a valid request_limit, initiate a scan */ if (atomic_read(&hostdata->request_limit) > 0) scsi_scan_host(host); } dev_set_drvdata(&vdev->dev, hostdata); spin_lock(&ibmvscsi_driver_lock); list_add_tail(&hostdata->host_list, &ibmvscsi_head); spin_unlock(&ibmvscsi_driver_lock); return 0; add_srp_port_failed: scsi_remove_host(hostdata->host); add_host_failed: release_event_pool(&hostdata->pool, hostdata); init_pool_failed: ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); kill_kthread: kthread_stop(hostdata->work_thread); init_crq_failed: unmap_persist_bufs(hostdata); persist_bufs_failed: scsi_host_put(host); scsi_host_alloc_failed: return -1; } static void ibmvscsi_remove(struct vio_dev *vdev) { struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); srp_remove_host(hostdata->host); scsi_remove_host(hostdata->host); purge_requests(hostdata, DID_ERROR); release_event_pool(&hostdata->pool, hostdata); ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); kthread_stop(hostdata->work_thread); unmap_persist_bufs(hostdata); spin_lock(&ibmvscsi_driver_lock); list_del(&hostdata->host_list); spin_unlock(&ibmvscsi_driver_lock); scsi_host_put(hostdata->host); } /** * ibmvscsi_resume: Resume from suspend * @dev: device struct * * We may have lost an interrupt across suspend/resume, so kick the * interrupt handler */ static int ibmvscsi_resume(struct device *dev) { struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); vio_disable_interrupts(to_vio_dev(hostdata->dev)); tasklet_schedule(&hostdata->srp_task); return 0; } /* * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we * support. */ static const struct vio_device_id ibmvscsi_device_table[] = { {"vscsi", "IBM,v-scsi"}, { "", "" } }; MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); static const struct dev_pm_ops ibmvscsi_pm_ops = { .resume = ibmvscsi_resume }; static struct vio_driver ibmvscsi_driver = { .id_table = ibmvscsi_device_table, .probe = ibmvscsi_probe, .remove = ibmvscsi_remove, .get_desired_dma = ibmvscsi_get_desired_dma, .name = "ibmvscsi", .pm = &ibmvscsi_pm_ops, }; static struct srp_function_template ibmvscsi_transport_functions = { }; static int __init ibmvscsi_module_init(void) { int ret; /* Ensure we have two requests to do error recovery */ driver_template.can_queue = max_requests; max_events = max_requests + 2; if (!firmware_has_feature(FW_FEATURE_VIO)) return -ENODEV; ibmvscsi_transport_template = srp_attach_transport(&ibmvscsi_transport_functions); if (!ibmvscsi_transport_template) return -ENOMEM; ret = vio_register_driver(&ibmvscsi_driver); if (ret) srp_release_transport(ibmvscsi_transport_template); return ret; } static void __exit ibmvscsi_module_exit(void) { vio_unregister_driver(&ibmvscsi_driver); srp_release_transport(ibmvscsi_transport_template); } module_init(ibmvscsi_module_init); module_exit(ibmvscsi_module_exit);
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