| /* ------------------------------------------------------------ |
| * 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) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| * USA |
| * |
| * ------------------------------------------------------------ |
| * 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[97] = "UNKNOWN"; |
| static unsigned int partition_number = -1; |
| |
| 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"); |
| module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(max_channel, "Largest channel value"); |
| 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; |
| } |
| |
| /** |
| * release_crq_queue: - Deallocates data and unregisters CRQ |
| * @queue: crq_queue to initialize and register |
| * @host_data: ibmvscsi_host_data of host |
| * |
| * 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 & 0x80) { |
| if (++queue->cur == queue->size) |
| queue->cur = 0; |
| } 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); |
| |
| 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 = 0x00; |
| } |
| |
| 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 = 0x00; |
| } else { |
| done = 1; |
| } |
| } |
| } |
| |
| static void gather_partition_info(void) |
| { |
| struct device_node *rootdn; |
| |
| const char *ppartition_name; |
| const unsigned int *p_number_ptr; |
| |
| /* Retrieve information about this partition */ |
| rootdn = of_find_node_by_path("/"); |
| if (!rootdn) { |
| return; |
| } |
| |
| ppartition_name = of_get_property(rootdn, "ibm,partition-name", NULL); |
| if (ppartition_name) |
| strncpy(partition_name, ppartition_name, |
| sizeof(partition_name)); |
| p_number_ptr = of_get_property(rootdn, "ibm,partition-no", NULL); |
| if (p_number_ptr) |
| partition_number = *p_number_ptr; |
| of_node_put(rootdn); |
| } |
| |
| 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 = partition_number; |
| |
| hostdata->madapter_info.mad_version = 1; |
| hostdata->madapter_info.os_type = 2; |
| } |
| |
| /** |
| * 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 == 2) { |
| /* 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; |
| } |
| |
| /** |
| * initialize_crq_queue: - Initializes and registers CRQ with hypervisor |
| * @queue: crq_queue to initialize and register |
| * @hostdata: ibmvscsi_host_data of host |
| * |
| * 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 == 2) { |
| /* 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; |
| } |
| |
| /** |
| * 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); |
| |
| /* 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, 0); |
| 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 = 0x80; |
| evt->crq.IU_length = sizeof(*evt->xfer_iu); |
| evt->crq.IU_data_ptr = 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; |
| } |
| |
| /** |
| * ibmvscsi_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_evt_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: 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 = 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 |
| * @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 = sg_dma_address(sg); |
| descr->len = 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 decriptor fields |
| * @cmd: Scsi_Cmnd with the scatterlist |
| * @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 = 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 = total_length; |
| return 1; |
| } |
| |
| /* get indirect table */ |
| if (!evt_struct->ext_list) { |
| evt_struct->ext_list = (struct srp_direct_buf *) |
| 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 = total_length; |
| indirect->table_desc.va = evt_struct->ext_list_token; |
| indirect->table_desc.len = 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 |
| * @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 |
| */ |
| 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->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_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); |
| atomic_set(&hostdata->request_limit, 0); |
| |
| purge_requests(hostdata, DID_ERROR); |
| hostdata->reset_crq = 1; |
| wake_up(&hostdata->work_wait_q); |
| } |
| |
| /** |
| * ibmvscsi_timeout - Internal command timeout handler |
| * @evt_struct: struct srp_event_struct that timed out |
| * |
| * Called when an internally generated command times out |
| */ |
| static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) |
| { |
| 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) |
| { |
| u64 *crq_as_u64 = (u64 *) &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); |
| |
| init_timer(&evt_struct->timer); |
| if (timeout) { |
| evt_struct->timer.data = (unsigned long) evt_struct; |
| evt_struct->timer.expires = jiffies + (timeout * HZ); |
| evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; |
| add_timer(&evt_struct->timer); |
| } |
| |
| if ((rc = |
| ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 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 %d\n", rsp->opcode); |
| } |
| |
| if (cmnd) { |
| cmnd->result |= rsp->status; |
| if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
| memcpy(cmnd->sense_buffer, |
| rsp->data, |
| 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, rsp->data_out_res_cnt); |
| else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
| scsi_set_resid(cmnd, 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_queue: - The queuecommand function of the scsi template |
| * @cmd: 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 *)) |
| { |
| 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 */ |
| srp_cmd = &evt_struct->iu.srp.cmd; |
| memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
| srp_cmd->opcode = SRP_CMD; |
| memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
| srp_cmd->lun = ((u64) lun) << 48; |
| |
| 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, |
| cmnd->request->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 = 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. */ |
| atomic_set(&hostdata->request_limit, -1); |
| return; |
| default: |
| dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", |
| evt_struct->xfer_iu->srp.login_rsp.opcode); |
| /* Login failed. */ |
| atomic_set(&hostdata->request_limit, -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. |
| */ |
| atomic_set(&hostdata->request_limit, |
| evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); |
| |
| /* If we had any pending I/Os, kick them */ |
| scsi_unblock_requests(hostdata->host); |
| } |
| |
| /** |
| * 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 = sizeof(union srp_iu); |
| login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; |
| |
| spin_lock_irqsave(hostdata->host->host_lock, flags); |
| /* 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. |
| */ |
| atomic_set(&hostdata->request_limit, 0); |
| |
| 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 != SERVER_SUPPORTS_CAP) |
| dev_info(hostdata->dev, "Partition migration not supported\n"); |
| |
| if (client_reserve) { |
| if (hostdata->caps.reserve.common.server_support == |
| 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 = CAP_LIST_SUPPORTED; |
| if (hostdata->client_migrated) |
| hostdata->caps.flags |= CLIENT_MIGRATED; |
| |
| strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), |
| sizeof(hostdata->caps.name)); |
| hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; |
| |
| location = of_get_property(of_node, "ibm,loc-code", NULL); |
| location = location ? location : dev_name(hostdata->dev); |
| strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); |
| hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; |
| |
| req->common.type = VIOSRP_CAPABILITIES_TYPE; |
| req->buffer = hostdata->caps_addr; |
| |
| hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES; |
| hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration); |
| hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP; |
| hostdata->caps.migration.ecl = 1; |
| |
| if (client_reserve) { |
| hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES; |
| hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve); |
| hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP; |
| hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2; |
| req->common.length = sizeof(hostdata->caps); |
| } else |
| req->common.length = 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; |
| u8 status = 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); |
| } |
| |
| /** |
| * init_host - 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 = VIOSRP_ENABLE_FAST_FAIL; |
| fast_fail_mad->common.length = 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, |
| hostdata->madapter_info.partition_number, |
| hostdata->madapter_info.os_type, |
| hostdata->madapter_info.port_max_txu[0]); |
| |
| if (hostdata->madapter_info.port_max_txu[0]) |
| hostdata->host->max_sectors = |
| hostdata->madapter_info.port_max_txu[0] >> 9; |
| |
| if (hostdata->madapter_info.os_type == 3 && |
| 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 (hostdata->madapter_info.os_type == 3) { |
| 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 = VIOSRP_ADAPTER_INFO_TYPE; |
| req->common.length = sizeof(hostdata->madapter_info); |
| req->buffer = 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_abort: 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; |
| tsk_mgmt->lun = ((u64) lun) << 48; |
| 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; |
| tsk_mgmt->lun = ((u64) lun) << 48; |
| 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; |
| struct srp_event_struct *evt_struct = |
| (struct srp_event_struct *)crq->IU_data_ptr; |
| switch (crq->valid) { |
| case 0xC0: /* initialization */ |
| switch (crq->format) { |
| case 0x01: /* 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 0x02: /* 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 0xFF: /* Hypervisor telling us the connection is closed */ |
| scsi_block_requests(hostdata->host); |
| atomic_set(&hostdata->request_limit, 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->reenable_crq = 1; |
| 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 0x80: /* 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", |
| (void *)crq->IU_data_ptr); |
| return; |
| } |
| |
| if (atomic_read(&evt_struct->free)) { |
| dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
| (void *)crq->IU_data_ptr); |
| return; |
| } |
| |
| if (crq->format == VIOSRP_SRP_FORMAT) |
| atomic_add(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_get_host_config: Send the command to the server to get host |
| * configuration data. The data is opaque to us. |
| */ |
| static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, |
| unsigned char *buffer, int length) |
| { |
| struct viosrp_host_config *host_config; |
| struct srp_event_struct *evt_struct; |
| unsigned long flags; |
| dma_addr_t addr; |
| int rc; |
| |
| evt_struct = get_event_struct(&hostdata->pool); |
| if (!evt_struct) { |
| dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
| return -1; |
| } |
| |
| init_event_struct(evt_struct, |
| sync_completion, |
| VIOSRP_MAD_FORMAT, |
| info_timeout); |
| |
| host_config = &evt_struct->iu.mad.host_config; |
| |
| /* Set up a lun reset SRP command */ |
| memset(host_config, 0x00, sizeof(*host_config)); |
| host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; |
| host_config->common.length = length; |
| host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
| length, |
| DMA_BIDIRECTIONAL); |
| |
| if (dma_mapping_error(hostdata->dev, host_config->buffer)) { |
| if (!firmware_has_feature(FW_FEATURE_CMO)) |
| dev_err(hostdata->dev, |
| "dma_mapping error getting host config\n"); |
| free_event_struct(&hostdata->pool, evt_struct); |
| return -1; |
| } |
| |
| init_completion(&evt_struct->comp); |
| 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); |
| if (rc == 0) |
| wait_for_completion(&evt_struct->comp); |
| dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
| |
| return rc; |
| } |
| |
| /** |
| * 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); |
| } |
| scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
| 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 |
| * @reason: calling context |
| * |
| * Return value: |
| * actual depth set |
| **/ |
| static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth, |
| int reason) |
| { |
| if (reason != SCSI_QDEPTH_DEFAULT) |
| return -EOPNOTSUPP; |
| |
| if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) |
| qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; |
| |
| scsi_adjust_queue_depth(sdev, 0, qdepth); |
| return sdev->queue_depth; |
| } |
| |
| /* ------------------------------------------------------------ |
| * 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", |
| 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", |
| 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", 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) |
| { |
| struct Scsi_Host *shost = class_to_shost(dev); |
| struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| |
| /* returns null-terminated host config data */ |
| if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) |
| return strlen(buf); |
| else |
| return 0; |
| } |
| |
| static struct device_attribute ibmvscsi_host_config = { |
| .attr = { |
| .name = "config", |
| .mode = S_IRUGO, |
| }, |
| .show = show_host_config, |
| }; |
| |
| static struct device_attribute *ibmvscsi_attrs[] = { |
| &ibmvscsi_host_vhost_loc, |
| &ibmvscsi_host_vhost_name, |
| &ibmvscsi_host_srp_version, |
| &ibmvscsi_host_partition_name, |
| &ibmvscsi_host_partition_number, |
| &ibmvscsi_host_mad_version, |
| &ibmvscsi_host_os_type, |
| &ibmvscsi_host_config, |
| NULL |
| }; |
| |
| /* ------------------------------------------------------------ |
| * 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_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, |
| .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
| .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
| .this_id = -1, |
| .sg_tablesize = SG_ALL, |
| .use_clustering = ENABLE_CLUSTERING, |
| .shost_attrs = ibmvscsi_attrs, |
| }; |
| |
| /** |
| * 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) |
| { |
| int rc; |
| char *action = "reset"; |
| |
| if (hostdata->reset_crq) { |
| smp_rmb(); |
| hostdata->reset_crq = 0; |
| |
| rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); |
| if (!rc) |
| rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
| vio_enable_interrupts(to_vio_dev(hostdata->dev)); |
| } else if (hostdata->reenable_crq) { |
| smp_rmb(); |
| action = "enable"; |
| rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); |
| hostdata->reenable_crq = 0; |
| if (!rc) |
| rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
| } else |
| return; |
| |
| if (rc) { |
| atomic_set(&hostdata->request_limit, -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; |
| else if (hostdata->reset_crq) { |
| smp_rmb(); |
| return 1; |
| } else if (hostdata->reenable_crq) { |
| smp_rmb(); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int ibmvscsi_work(void *data) |
| { |
| struct ibmvscsi_host_data *hostdata = data; |
| int rc; |
| |
| set_user_nice(current, -20); |
| |
| 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; |
| atomic_set(&hostdata->request_limit, -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 = 8; |
| host->max_id = max_id; |
| host->max_channel = max_channel; |
| host->max_cmd_len = 16; |
| |
| 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); |
| 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 int ibmvscsi_remove(struct vio_dev *vdev) |
| { |
| struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
| unmap_persist_bufs(hostdata); |
| release_event_pool(&hostdata->pool, hostdata); |
| ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, |
| max_events); |
| |
| kthread_stop(hostdata->work_thread); |
| srp_remove_host(hostdata->host); |
| scsi_remove_host(hostdata->host); |
| scsi_host_put(hostdata->host); |
| |
| return 0; |
| } |
| |
| /** |
| * 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 struct vio_device_id ibmvscsi_device_table[] __devinitdata = { |
| {"vscsi", "IBM,v-scsi"}, |
| { "", "" } |
| }; |
| MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
| |
| static 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 = { |
| }; |
| |
| 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; |
| } |
| |
| 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); |