diff options
Diffstat (limited to 'drivers/scsi/ibmvscsi')
| -rw-r--r-- | drivers/scsi/ibmvscsi/Makefile | 5 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvscsi.c | 1473 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvscsi.h | 109 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/iseries_vscsi.c | 144 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/rpa_vscsi.c | 260 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/srp.h | 225 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/viosrp.h | 126 |
7 files changed, 2342 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/Makefile b/drivers/scsi/ibmvscsi/Makefile new file mode 100644 index 00000000000..4e247b6b870 --- /dev/null +++ b/drivers/scsi/ibmvscsi/Makefile @@ -0,0 +1,5 @@ +obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsic.o + +ibmvscsic-y += ibmvscsi.o +ibmvscsic-$(CONFIG_PPC_ISERIES) += iseries_vscsi.o +ibmvscsic-$(CONFIG_PPC_PSERIES) += rpa_vscsi.o diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c new file mode 100644 index 00000000000..e89f76e5dd5 --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -0,0 +1,1473 @@ +/* ------------------------------------------------------------ + * 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-robbin 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. + * + * Note that some of the underlying infrastructure is different between + * machines conforming to the "RS/6000 Platform Architecture" (RPA) and + * the older iSeries hypervisor models. To support both, some low level + * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c. + * The Makefile should pick one, not two, not zero, of these. + * + * TODO: This is currently pretty tied to the IBM i/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 <asm/vio.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.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 = 5; +static int max_requests = 50; + +#define IBMVSCSI_VERSION "1.5.5" + +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 | S_IWUSR); +MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); + +/* ------------------------------------------------------------ + * 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 = kmalloc(pool->size * sizeof(*pool->events), GFP_KERNEL); + if (!pool->events) + return -ENOMEM; + memset(pool->events, 0x00, pool->size * sizeof(*pool->events)); + + 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; + } + + 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 (in_use) + printk(KERN_WARNING + "ibmvscsi: 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)) { + printk(KERN_ERR + "ibmvscsi: Freeing invalid event_struct %p " + "(not in pool %p)\n", evt, pool->events); + return; + } + if (atomic_inc_return(&evt->free) != 1) { + printk(KERN_ERR + "ibmvscsi: 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) +{ + if (numbuf == 0) + return; + + if (numbuf == 1) { + if (cmd->sc_data_direction == DMA_TO_DEVICE) + srp_cmd->data_out_format = SRP_DIRECT_BUFFER; + else + srp_cmd->data_in_format = SRP_DIRECT_BUFFER; + } else { + if (cmd->sc_data_direction == DMA_TO_DEVICE) { + srp_cmd->data_out_format = SRP_INDIRECT_BUFFER; + srp_cmd->data_out_count = numbuf; + } else { + srp_cmd->data_in_format = SRP_INDIRECT_BUFFER; + srp_cmd->data_in_count = numbuf; + } + } +} + +/** + * 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 device *dev) +{ + int i; + + if ((cmd->data_out_format == SRP_NO_BUFFER) && + (cmd->data_in_format == SRP_NO_BUFFER)) + return; + else if ((cmd->data_out_format == SRP_DIRECT_BUFFER) || + (cmd->data_in_format == SRP_DIRECT_BUFFER)) { + struct memory_descriptor *data = + (struct memory_descriptor *)cmd->additional_data; + dma_unmap_single(dev, data->virtual_address, data->length, + DMA_BIDIRECTIONAL); + } else { + struct indirect_descriptor *indirect = + (struct indirect_descriptor *)cmd->additional_data; + int num_mapped = indirect->head.length / + sizeof(indirect->list[0]); + for (i = 0; i < num_mapped; ++i) { + struct memory_descriptor *data = &indirect->list[i]; + dma_unmap_single(dev, + data->virtual_address, + data->length, DMA_BIDIRECTIONAL); + } + } +} + +/** + * 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_cmd *srp_cmd, struct device *dev) +{ + + int i, sg_mapped; + u64 total_length = 0; + struct scatterlist *sg = cmd->request_buffer; + struct memory_descriptor *data = + (struct memory_descriptor *)srp_cmd->additional_data; + struct indirect_descriptor *indirect = + (struct indirect_descriptor *)data; + + sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL); + + 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) { + data->virtual_address = sg_dma_address(&sg[0]); + data->length = sg_dma_len(&sg[0]); + data->memory_handle = 0; + return 1; + } + + if (sg_mapped > MAX_INDIRECT_BUFS) { + printk(KERN_ERR + "ibmvscsi: More than %d mapped sg entries, got %d\n", + MAX_INDIRECT_BUFS, sg_mapped); + return 0; + } + + indirect->head.virtual_address = 0; + indirect->head.length = sg_mapped * sizeof(indirect->list[0]); + indirect->head.memory_handle = 0; + for (i = 0; i < sg_mapped; ++i) { + struct memory_descriptor *descr = &indirect->list[i]; + struct scatterlist *sg_entry = &sg[i]; + descr->virtual_address = sg_dma_address(sg_entry); + descr->length = sg_dma_len(sg_entry); + descr->memory_handle = 0; + total_length += sg_dma_len(sg_entry); + } + indirect->total_length = total_length; + + return 1; +} + +/** + * map_single_data: - Maps memory and initializes memory decriptor fields + * @cmd: struct scsi_cmnd with the memory to be mapped + * @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_single_data(struct scsi_cmnd *cmd, + struct srp_cmd *srp_cmd, struct device *dev) +{ + struct memory_descriptor *data = + (struct memory_descriptor *)srp_cmd->additional_data; + + data->virtual_address = + dma_map_single(dev, cmd->request_buffer, + cmd->request_bufflen, + DMA_BIDIRECTIONAL); + if (dma_mapping_error(data->virtual_address)) { + printk(KERN_ERR + "ibmvscsi: Unable to map request_buffer for command!\n"); + return 0; + } + data->length = cmd->request_bufflen; + data->memory_handle = 0; + + set_srp_direction(cmd, srp_cmd, 1); + + 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_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: + printk(KERN_ERR + "ibmvscsi: Can't map DMA_BIDIRECTIONAL to read/write\n"); + return 0; + default: + printk(KERN_ERR + "ibmvscsi: Unknown data direction 0x%02x; can't map!\n", + cmd->sc_data_direction); + return 0; + } + + if (!cmd->request_buffer) + return 1; + if (cmd->use_sg) + return map_sg_data(cmd, srp_cmd, dev); + return map_single_data(cmd, srp_cmd, dev); +} + +/* ------------------------------------------------------------ + * 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 + * + * 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) +{ + struct scsi_cmnd *cmnd; + u64 *crq_as_u64 = (u64 *) &evt_struct->crq; + int rc; + + /* If we have exhausted our request limit, just fail this request. + * 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) && + (atomic_dec_if_positive(&hostdata->request_limit) < 0)) { + /* See if the adapter is disabled */ + if (atomic_read(&hostdata->request_limit) < 0) + goto send_error; + + printk(KERN_WARNING + "ibmvscsi: Warning, request_limit exceeded\n"); + unmap_cmd_data(&evt_struct->iu.srp.cmd, + hostdata->dev); + free_event_struct(&hostdata->pool, evt_struct); + return SCSI_MLQUEUE_HOST_BUSY; + } + + /* Copy the IU into the transfer area */ + *evt_struct->xfer_iu = evt_struct->iu; + evt_struct->xfer_iu->srp.generic.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); + + if ((rc = + ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { + list_del(&evt_struct->list); + + printk(KERN_ERR "ibmvscsi: failed to send event struct rc %d\n", + rc); + goto send_error; + } + + return 0; + + send_error: + unmap_cmd_data(&evt_struct->iu.srp.cmd, hostdata->dev); + + if ((cmnd = evt_struct->cmnd) != NULL) { + cmnd->result = DID_ERROR << 16; + evt_struct->cmnd_done(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->type != SRP_RSP_TYPE)) { + if (printk_ratelimit()) + printk(KERN_WARNING + "ibmvscsi: bad SRP RSP type %d\n", + rsp->type); + } + + if (cmnd) { + cmnd->result = rsp->status; + if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) + memcpy(cmnd->sense_buffer, + rsp->sense_and_response_data, + rsp->sense_data_list_length); + unmap_cmd_data(&evt_struct->iu.srp.cmd, + evt_struct->hostdata->dev); + + if (rsp->doover) + cmnd->resid = rsp->data_out_residual_count; + else if (rsp->diover) + cmnd->resid = rsp->data_in_residual_count; + } + + 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(struct scsi_cmnd *cmnd, + void (*done) (struct scsi_cmnd *)) +{ + struct srp_cmd *srp_cmd; + struct srp_event_struct *evt_struct; + struct ibmvscsi_host_data *hostdata = + (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata; + u16 lun = lun_from_dev(cmnd->device); + + evt_struct = get_event_struct(&hostdata->pool); + if (!evt_struct) + return SCSI_MLQUEUE_HOST_BUSY; + + init_event_struct(evt_struct, + handle_cmd_rsp, + VIOSRP_SRP_FORMAT, + cmnd->timeout); + + evt_struct->cmnd = cmnd; + evt_struct->cmnd_done = done; + + /* Set up the actual SRP IU */ + srp_cmd = &evt_struct->iu.srp.cmd; + memset(srp_cmd, 0x00, sizeof(*srp_cmd)); + srp_cmd->type = SRP_CMD_TYPE; + memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd)); + srp_cmd->lun = ((u64) lun) << 48; + + if (!map_data_for_srp_cmd(cmnd, srp_cmd, hostdata->dev)) { + printk(KERN_ERR "ibmvscsi: couldn't convert cmd to srp_cmd\n"); + free_event_struct(&hostdata->pool, evt_struct); + return SCSI_MLQUEUE_HOST_BUSY; + } + + /* Fix up dma address of the buffer itself */ + if ((srp_cmd->data_out_format == SRP_INDIRECT_BUFFER) || + (srp_cmd->data_in_format == SRP_INDIRECT_BUFFER)) { + struct indirect_descriptor *indirect = + (struct indirect_descriptor *)srp_cmd->additional_data; + indirect->head.virtual_address = evt_struct->crq.IU_data_ptr + + offsetof(struct srp_cmd, additional_data) + + offsetof(struct indirect_descriptor, list); + } + + return ibmvscsi_send_srp_event(evt_struct, hostdata); +} + +/* ------------------------------------------------------------ + * Routines for driver initialization + */ +/** + * 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; + dma_unmap_single(hostdata->dev, + evt_struct->iu.mad.adapter_info.buffer, + evt_struct->iu.mad.adapter_info.common.length, + DMA_BIDIRECTIONAL); + + if (evt_struct->xfer_iu->mad.adapter_info.common.status) { + printk("ibmvscsi: error %d getting adapter info\n", + evt_struct->xfer_iu->mad.adapter_info.common.status); + } else { + printk("ibmvscsi: 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; + } +} + +/** + * 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; + + memset(&hostdata->madapter_info, 0x00, sizeof(hostdata->madapter_info)); + + evt_struct = get_event_struct(&hostdata->pool); + if (!evt_struct) { + printk(KERN_ERR "ibmvscsi: couldn't allocate an event " + "for ADAPTER_INFO_REQ!\n"); + return; + } + + init_event_struct(evt_struct, + adapter_info_rsp, + VIOSRP_MAD_FORMAT, + init_timeout * HZ); + + 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 = dma_map_single(hostdata->dev, + &hostdata->madapter_info, + sizeof(hostdata->madapter_info), + DMA_BIDIRECTIONAL); + + if (dma_mapping_error(req->buffer)) { + printk(KERN_ERR + "ibmvscsi: Unable to map request_buffer " + "for adapter_info!\n"); + free_event_struct(&hostdata->pool, evt_struct); + return; + } + + if (ibmvscsi_send_srp_event(evt_struct, hostdata)) + printk(KERN_ERR "ibmvscsi: couldn't send ADAPTER_INFO_REQ!\n"); +}; + +/** + * 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.generic.type) { + case SRP_LOGIN_RSP_TYPE: /* it worked! */ + break; + case SRP_LOGIN_REJ_TYPE: /* refused! */ + printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REQ rejected\n"); + /* Login failed. */ + atomic_set(&hostdata->request_limit, -1); + return; + default: + printk(KERN_ERR + "ibmvscsi: Invalid login response typecode 0x%02x!\n", + evt_struct->xfer_iu->srp.generic.type); + /* Login failed. */ + atomic_set(&hostdata->request_limit, -1); + return; + } + + printk(KERN_INFO "ibmvscsi: SRP_LOGIN succeeded\n"); + + if (evt_struct->xfer_iu->srp.login_rsp.request_limit_delta > + (max_requests - 2)) + evt_struct->xfer_iu->srp.login_rsp.request_limit_delta = + max_requests - 2; + + /* Now we know what the real request-limit is */ + atomic_set(&hostdata->request_limit, + evt_struct->xfer_iu->srp.login_rsp.request_limit_delta); + + hostdata->host->can_queue = + evt_struct->xfer_iu->srp.login_rsp.request_limit_delta - 2; + + if (hostdata->host->can_queue < 1) { + printk(KERN_ERR "ibmvscsi: Invalid request_limit_delta\n"); + return; + } + + send_mad_adapter_info(hostdata); + return; +} + +/** + * 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); + if (!evt_struct) { + printk(KERN_ERR + "ibmvscsi: couldn't allocate an event for login req!\n"); + return FAILED; + } + + init_event_struct(evt_struct, + login_rsp, + VIOSRP_SRP_FORMAT, + init_timeout * HZ); + + login = &evt_struct->iu.srp.login_req; + login->type = SRP_LOGIN_REQ_TYPE; + login->max_requested_initiator_to_target_iulen = sizeof(union srp_iu); + login->required_buffer_formats = 0x0006; + + /* Start out with a request limit of 1, since this is negotiated in + * the login request we are just sending + */ + atomic_set(&hostdata->request_limit, 1); + + spin_lock_irqsave(hostdata->host->host_lock, flags); + rc = ibmvscsi_send_srp_event(evt_struct, hostdata); + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + return rc; +}; + +/** + * 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 = + (struct ibmvscsi_host_data *)cmd->device->host->hostdata; + 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; + u16 lun = lun_from_dev(cmd->device); + + /* First, find this command in our sent list so we can figure + * out the correct tag + */ + 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) + return FAILED; + + evt = get_event_struct(&hostdata->pool); + if (evt == NULL) { + printk(KERN_ERR "ibmvscsi: failed to allocate abort event\n"); + return FAILED; + } + + init_event_struct(evt, + sync_completion, + VIOSRP_SRP_FORMAT, + init_timeout * HZ); + + tsk_mgmt = &evt->iu.srp.tsk_mgmt; + + /* Set up an abort SRP command */ + memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); + tsk_mgmt->type = SRP_TSK_MGMT_TYPE; + tsk_mgmt->lun = ((u64) lun) << 48; + tsk_mgmt->task_mgmt_flags = 0x01; /* ABORT TASK */ + tsk_mgmt->managed_task_tag = (u64) found_evt; + + printk(KERN_INFO "ibmvscsi: aborting command. lun 0x%lx, tag 0x%lx\n", + tsk_mgmt->lun, tsk_mgmt->managed_task_tag); + + evt->sync_srp = &srp_rsp; + init_completion(&evt->comp); + if (ibmvscsi_send_srp_event(evt, hostdata) != 0) { + printk(KERN_ERR "ibmvscsi: failed to send abort() event\n"); + return FAILED; + } + + spin_unlock_irq(hostdata->host->host_lock); + wait_for_completion(&evt->comp); + spin_lock_irq(hostdata->host->host_lock); + + /* make sure we got a good response */ + if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) { + if (printk_ratelimit()) + printk(KERN_WARNING + "ibmvscsi: abort bad SRP RSP type %d\n", + srp_rsp.srp.generic.type); + return FAILED; + } + + if (srp_rsp.srp.rsp.rspvalid) + rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data); + else + rsp_rc = srp_rsp.srp.rsp.status; + + if (rsp_rc) { + if (printk_ratelimit()) + printk(KERN_WARNING + "ibmvscsi: abort code %d for task tag 0x%lx\n", + rsp_rc, + tsk_mgmt->managed_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 + */ + 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) { + printk(KERN_INFO + "ibmvscsi: aborted task tag 0x%lx completed\n", + tsk_mgmt->managed_task_tag); + return SUCCESS; + } + + printk(KERN_INFO + "ibmvscsi: successfully aborted task tag 0x%lx\n", + tsk_mgmt->managed_task_tag); + + cmd->result = (DID_ABORT << 16); + list_del(&found_evt->list); + unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt->hostdata->dev); + free_event_struct(&found_evt->hostdata->pool, found_evt); + 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 = + (struct ibmvscsi_host_data *)cmd->device->host->hostdata; + + 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; + u16 lun = lun_from_dev(cmd->device); + + evt = get_event_struct(&hostdata->pool); + if (evt == NULL) { + printk(KERN_ERR "ibmvscsi: failed to allocate reset event\n"); + return FAILED; + } + + init_event_struct(evt, + sync_completion, + VIOSRP_SRP_FORMAT, + init_timeout * HZ); + + tsk_mgmt = &evt->iu.srp.tsk_mgmt; + + /* Set up a lun reset SRP command */ + memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); + tsk_mgmt->type = SRP_TSK_MGMT_TYPE; + tsk_mgmt->lun = ((u64) lun) << 48; + tsk_mgmt->task_mgmt_flags = 0x08; /* LUN RESET */ + + printk(KERN_INFO "ibmvscsi: resetting device. lun 0x%lx\n", + tsk_mgmt->lun); + + evt->sync_srp = &srp_rsp; + init_completion(&evt->comp); + if (ibmvscsi_send_srp_event(evt, hostdata) != 0) { + printk(KERN_ERR "ibmvscsi: failed to send reset event\n"); + return FAILED; + } + + spin_unlock_irq(hostdata->host->host_lock); + wait_for_completion(&evt->comp); + spin_lock_irq(hostdata->host->host_lock); + + /* make sure we got a good response */ + if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) { + if (printk_ratelimit()) + printk(KERN_WARNING + "ibmvscsi: reset bad SRP RSP type %d\n", + srp_rsp.srp.generic.type); + return FAILED; + } + + if (srp_rsp.srp.rsp.rspvalid) + rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data); + else + rsp_rc = srp_rsp.srp.rsp.status; + + if (rsp_rc) { + if (printk_ratelimit()) + printk(KERN_WARNING + "ibmvscsi: reset code %d for task tag 0x%lx\n", + rsp_rc, + tsk_mgmt->managed_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 + */ + 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->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); + } + } + return SUCCESS; +} + +/** + * purge_requests: Our virtual adapter just shut down. purge any sent requests + * @hostdata: the adapter + */ +static void purge_requests(struct ibmvscsi_host_data *hostdata) +{ + struct srp_event_struct *tmp_evt, *pos; + unsigned long flags; + + spin_lock_irqsave(hostdata->host->host_lock, flags); + list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { + list_del(&tmp_evt->list); + if (tmp_evt->cmnd) { + tmp_evt->cmnd->result = (DID_ERROR << 16); + unmap_cmd_data(&tmp_evt->iu.srp.cmd, + tmp_evt->hostdata->dev); + if (tmp_evt->cmnd_done) + tmp_evt->cmnd_done(tmp_evt->cmnd); + } else { + if (tmp_evt->done) { + tmp_evt->done(tmp_evt); + } + } + free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); + } + spin_unlock_irqrestore(hostdata->host->host_lock, flags); +} + +/** + * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ + * @crq: Command/Response queue + * @hostdata: ibmvscsi_host_data of host + * +*/ +void ibmvscsi_handle_crq(struct viosrp_crq *crq, + struct ibmvscsi_host_data *hostdata) +{ + 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 */ + printk(KERN_INFO "ibmvscsi: partner initialized\n"); + /* Send back a response */ + if (ibmvscsi_send_crq(hostdata, + 0xC002000000000000LL, 0) == 0) { + /* Now login */ + send_srp_login(hostdata); + } else { + printk(KERN_ERR + "ibmvscsi: Unable to send init rsp\n"); + } + + break; + case 0x02: /* Initialization response */ + printk(KERN_INFO + "ibmvscsi: partner initialization complete\n"); + + /* Now login */ + send_srp_login(hostdata); + break; + default: + printk(KERN_ERR "ibmvscsi: unknown crq message type\n"); + } + return; + case 0xFF: /* Hypervisor telling us the connection is closed */ + printk(KERN_INFO "ibmvscsi: Virtual adapter failed!\n"); + + atomic_set(&hostdata->request_limit, -1); + purge_requests(hostdata); + ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); + return; + case 0x80: /* real payload */ + break; + default: + printk(KERN_ERR + "ibmvscsi: 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)) { + printk(KERN_ERR + "ibmvscsi: returned correlation_token 0x%p is invalid!\n", + (void *)crq->IU_data_ptr); + return; + } + + if (atomic_read(&evt_struct->free)) { + printk(KERN_ERR + "ibmvscsi: 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.request_limit_delta, + &hostdata->request_limit); + + if (evt_struct->done) + evt_struct->done(evt_struct); + else + printk(KERN_ERR + "ibmvscsi: 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; + int rc; + + evt_struct = get_event_struct(&hostdata->pool); + if (!evt_struct) { + printk(KERN_ERR + "ibmvscsi: could't allocate event for HOST_CONFIG!\n"); + return -1; + } + + init_event_struct(evt_struct, + sync_completion, + VIOSRP_MAD_FORMAT, + init_timeout * HZ); + + 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 = dma_map_single(hostdata->dev, buffer, length, + DMA_BIDIRECTIONAL); + + if (dma_mapping_error(host_config->buffer)) { + printk(KERN_ERR + "ibmvscsi: dma_mapping error " "getting host config\n"); + free_event_struct(&hostdata->pool, evt_struct); + return -1; + } + + init_completion(&evt_struct->comp); + rc = ibmvscsi_send_srp_event(evt_struct, hostdata); + if (rc == 0) { + wait_for_completion(&evt_struct->comp); + dma_unmap_single(hostdata->dev, host_config->buffer, + length, DMA_BIDIRECTIONAL); + } + + return rc; +} + +/* ------------------------------------------------------------ + * sysfs attributes + */ +static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + struct ibmvscsi_host_data *hostdata = + (struct ibmvscsi_host_data *)shost->hostdata; + int len; + + len = snprintf(buf, PAGE_SIZE, "%s\n", + hostdata->madapter_info.srp_version); + return len; +} + +static struct class_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 class_device *class_dev, + char *buf) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + struct ibmvscsi_host_data *hostdata = + (struct ibmvscsi_host_data *)shost->hostdata; + int len; + + len = snprintf(buf, PAGE_SIZE, "%s\n", + hostdata->madapter_info.partition_name); + return len; +} + +static struct class_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 class_device *class_dev, + char *buf) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + struct ibmvscsi_host_data *hostdata = + (struct ibmvscsi_host_data *)shost->hostdata; + int len; + + len = snprintf(buf, PAGE_SIZE, "%d\n", + hostdata->madapter_info.partition_number); + return len; +} + +static struct class_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 class_device *class_dev, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + struct ibmvscsi_host_data *hostdata = + (struct ibmvscsi_host_data *)shost->hostdata; + int len; + + len = snprintf(buf, PAGE_SIZE, "%d\n", + hostdata->madapter_info.mad_version); + return len; +} + +static struct class_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 class_device *class_dev, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + struct ibmvscsi_host_data *hostdata = + (struct ibmvscsi_host_data *)shost->hostdata; + int len; + + len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); + return len; +} + +static struct class_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 class_device *class_dev, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + struct ibmvscsi_host_data *hostdata = + (struct ibmvscsi_host_data *)shost->hostdata; + + /* returns null-terminated host config data */ + if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) + return strlen(buf); + else + return 0; +} + +static struct class_device_attribute ibmvscsi_host_config = { + .attr = { + .name = "config", + .mode = S_IRUGO, + }, + .show = show_host_config, +}; + +static struct class_device_attribute *ibmvscsi_attrs[] = { + &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, + .cmd_per_lun = 16, + .can_queue = 1, /* Updated after SRP_LOGIN */ + .this_id = -1, + .sg_tablesize = MAX_INDIRECT_BUFS, + .use_clustering = ENABLE_CLUSTERING, + .shost_attrs = ibmvscsi_attrs, +}; + +/** + * 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; + unsigned long wait_switch = 0; + + vdev->dev.driver_data = NULL; + + host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); + if (!host) { + printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n"); + goto scsi_host_alloc_failed; + } + + hostdata = (struct ibmvscsi_host_data *)host->hostdata; + memset(hostdata, 0x00, sizeof(*hostdata)); + INIT_LIST_HEAD(&hostdata->sent); + hostdata->host = host; + hostdata->dev = dev; + atomic_set(&hostdata->request_limit, -1); + hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */ + + if (ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, + max_requests) != 0) { + printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n"); + goto init_crq_failed; + } + if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) { + printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n"); + goto init_pool_failed; + } + + host->max_lun = 8; + host->max_id = max_id; + host->max_channel = max_channel; + + if (scsi_add_host(hostdata->host, hostdata->dev)) + goto add_host_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) { + /* + * 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); + } + + vdev->dev.driver_data = hostdata; + return 0; + + add_host_failed: + release_event_pool(&hostdata->pool, hostdata); + init_pool_failed: + ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests); + init_crq_failed: + scsi_host_put(host); + scsi_host_alloc_failed: + return -1; +} + +static int ibmvscsi_remove(struct vio_dev *vdev) +{ + struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data; + release_event_pool(&hostdata->pool, hostdata); + ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, + max_requests); + + scsi_remove_host(hostdata->host); + scsi_host_put(hostdata->host); + + 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"}, + {0,} +}; + +MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); +static struct vio_driver ibmvscsi_driver = { + .name = "ibmvscsi", + .id_table = ibmvscsi_device_table, + .probe = ibmvscsi_probe, + .remove = ibmvscsi_remove +}; + +int __init ibmvscsi_module_init(void) +{ + return vio_register_driver(&ibmvscsi_driver); +} + +void __exit ibmvscsi_module_exit(void) +{ + vio_unregister_driver(&ibmvscsi_driver); +} + +module_init(ibmvscsi_module_init); +module_exit(ibmvscsi_module_exit); diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h new file mode 100644 index 00000000000..1030b703c30 --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvscsi.h @@ -0,0 +1,109 @@ +/* ------------------------------------------------------------ + * ibmvscsi.h + * (C) Copyright IBM Corporation 1994, 2003 + * 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 allows the Linux SCSI peripheral drivers to directly + * access devices in the hosting partition, either on an iSeries + * hypervisor system or a converged hypervisor system. + */ +#ifndef IBMVSCSI_H +#define IBMVSCSI_H +#include <linux/types.h> +#include <linux/list.h> +#include <linux/completion.h> +#include <linux/interrupt.h> +#include "viosrp.h" + +struct scsi_cmnd; +struct Scsi_Host; + +/* Number of indirect bufs...the list of these has to fit in the + * additional data of the srp_cmd struct along with the indirect + * descriptor + */ +#define MAX_INDIRECT_BUFS 10 + +/* ------------------------------------------------------------ + * Data Structures + */ +/* an RPA command/response transport queue */ +struct crq_queue { + struct viosrp_crq *msgs; + int size, cur; + dma_addr_t msg_token; + spinlock_t lock; +}; + +/* a unit of work for the hosting partition */ +struct srp_event_struct { + union viosrp_iu *xfer_iu; + struct scsi_cmnd *cmnd; + struct list_head list; + void (*done) (struct srp_event_struct *); + struct viosrp_crq crq; + struct ibmvscsi_host_data *hostdata; + atomic_t free; + union viosrp_iu iu; + void (*cmnd_done) (struct scsi_cmnd *); + struct completion comp; + union viosrp_iu *sync_srp; +}; + +/* a pool of event structs for use */ +struct event_pool { + struct srp_event_struct *events; + u32 size; + int next; + union viosrp_iu *iu_storage; + dma_addr_t iu_token; +}; + +/* all driver data associated with a host adapter */ +struct ibmvscsi_host_data { + atomic_t request_limit; + struct device *dev; + struct event_pool pool; + struct crq_queue queue; + struct tasklet_struct srp_task; + struct list_head sent; + struct Scsi_Host *host; + struct mad_adapter_info_data madapter_info; +}; + +/* routines for managing a command/response queue */ +int ibmvscsi_init_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata, + int max_requests); +void ibmvscsi_release_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata, + int max_requests); +void ibmvscsi_reset_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata); + +void ibmvscsi_handle_crq(struct viosrp_crq *crq, + struct ibmvscsi_host_data *hostdata); +int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, + u64 word1, u64 word2); + +#endif /* IBMVSCSI_H */ diff --git a/drivers/scsi/ibmvscsi/iseries_vscsi.c b/drivers/scsi/ibmvscsi/iseries_vscsi.c new file mode 100644 index 00000000000..e9202f2a827 --- /dev/null +++ b/drivers/scsi/ibmvscsi/iseries_vscsi.c @@ -0,0 +1,144 @@ +/* ------------------------------------------------------------ + * iSeries_vscsi.c + * (C) Copyright IBM Corporation 1994, 2003 + * 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 + * + * ------------------------------------------------------------ + * iSeries-specific functions of the SCSI host adapter for Virtual I/O devices + * + * This driver allows the Linux SCSI peripheral drivers to directly + * access devices in the hosting partition, either on an iSeries + * hypervisor system or a converged hypervisor system. + */ + +#include <asm/iSeries/vio.h> +#include <asm/iSeries/HvLpEvent.h> +#include <asm/iSeries/HvTypes.h> +#include <asm/iSeries/HvLpConfig.h> +#include <asm/vio.h> +#include <linux/device.h> +#include "ibmvscsi.h" + +/* global variables */ +static struct ibmvscsi_host_data *single_host_data; + +/* ------------------------------------------------------------ + * Routines for direct interpartition interaction + */ +struct srp_lp_event { + struct HvLpEvent lpevt; /* 0x00-0x17 */ + u32 reserved1; /* 0x18-0x1B; unused */ + u16 version; /* 0x1C-0x1D; unused */ + u16 subtype_rc; /* 0x1E-0x1F; unused */ + struct viosrp_crq crq; /* 0x20-0x3F */ +}; + +/** + * standard interface for handling logical partition events. + */ +static void ibmvscsi_handle_event(struct HvLpEvent *lpevt) +{ + struct srp_lp_event *evt = (struct srp_lp_event *)lpevt; + + if (!evt) { + printk(KERN_ERR "ibmvscsi: received null event\n"); + return; + } + + if (single_host_data == NULL) { + printk(KERN_ERR + "ibmvscsi: received event, no adapter present\n"); + return; + } + + ibmvscsi_handle_crq(&evt->crq, single_host_data); +} + +/* ------------------------------------------------------------ + * Routines for driver initialization + */ +int ibmvscsi_init_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata, + int max_requests) +{ + int rc; + + single_host_data = hostdata; + rc = viopath_open(viopath_hostLp, viomajorsubtype_scsi, 0); + if (rc < 0) { + printk("viopath_open failed with rc %d in open_event_path\n", + rc); + goto viopath_open_failed; + } + + rc = vio_setHandler(viomajorsubtype_scsi, ibmvscsi_handle_event); + if (rc < 0) { + printk("vio_setHandler failed with rc %d in open_event_path\n", + rc); + goto vio_setHandler_failed; + } + return 0; + + vio_setHandler_failed: + viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests); + viopath_open_failed: + return -1; +} + +void ibmvscsi_release_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata, + int max_requests) +{ + vio_clearHandler(viomajorsubtype_scsi); + viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests); +} + +/** + * reset_crq_queue: - resets a crq after a failure + * @queue: crq_queue to initialize and register + * @hostdata: ibmvscsi_host_data of host + * + * no-op for iSeries + */ +void ibmvscsi_reset_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata) +{ +} + +/** + * 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 + */ +int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2) +{ + single_host_data = hostdata; + return HvCallEvent_signalLpEventFast(viopath_hostLp, + HvLpEvent_Type_VirtualIo, + viomajorsubtype_scsi, + HvLpEvent_AckInd_NoAck, + HvLpEvent_AckType_ImmediateAck, + viopath_sourceinst(viopath_hostLp), + viopath_targetinst(viopath_hostLp), + 0, + VIOVERSION << 16, word1, word2, 0, + 0); +} diff --git a/drivers/scsi/ibmvscsi/rpa_vscsi.c b/drivers/scsi/ibmvscsi/rpa_vscsi.c new file mode 100644 index 00000000000..50cb909f314 --- /dev/null +++ b/drivers/scsi/ibmvscsi/rpa_vscsi.c @@ -0,0 +1,260 @@ +/* ------------------------------------------------------------ + * rpa_vscsi.c + * (C) Copyright IBM Corporation 1994, 2003 + * Authors: Colin DeVilbiss (devilbis@us.ibm.com) + * Santiago Leon (santil@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 + * + * ------------------------------------------------------------ + * RPA-specific functions of the SCSI host adapter for Virtual I/O devices + * + * This driver allows the Linux SCSI peripheral drivers to directly + * access devices in the hosting partition, either on an iSeries + * hypervisor system or a converged hypervisor system. + */ + +#include <asm/vio.h> +#include <asm/iommu.h> +#include <asm/hvcall.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include "ibmvscsi.h" + +/* ------------------------------------------------------------ + * 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 + * @regs: pt_regs with registers + * + * Disables interrupts and schedules srp_task + * Always returns IRQ_HANDLED + */ +static irqreturn_t ibmvscsi_handle_event(int irq, + void *dev_instance, + struct pt_regs *regs) +{ + 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. + */ +void ibmvscsi_release_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata, + int max_requests) +{ + long rc; + struct vio_dev *vdev = to_vio_dev(hostdata->dev); + free_irq(vdev->irq, (void *)hostdata); + tasklet_kill(&hostdata->srp_task); + do { + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while ((rc == H_Busy) || (H_isLongBusy(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 + */ +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); + if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { + vio_disable_interrupts(vdev); + ibmvscsi_handle_crq(crq, hostdata); + crq->valid = 0x00; + } else { + done = 1; + } + } +} + +/** + * 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. + */ +int ibmvscsi_init_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata, + int max_requests) +{ + int rc; + 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(queue->msg_token)) + goto map_failed; + + 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 */ + printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n"); + } else if (rc != 0) { + printk(KERN_WARNING "ibmvscsi: Error %d opening adapter\n", rc); + goto reg_crq_failed; + } + + if (request_irq(vdev->irq, + ibmvscsi_handle_event, + 0, "ibmvscsi", (void *)hostdata) != 0) { + printk(KERN_ERR "ibmvscsi: couldn't register irq 0x%x\n", + vdev->irq); + goto req_irq_failed; + } + + rc = vio_enable_interrupts(vdev); + if (rc != 0) { + printk(KERN_ERR "ibmvscsi: Error %d enabling interrupts!!!\n", + rc); + goto req_irq_failed; + } + + queue->cur = 0; + spin_lock_init(&queue->lock); + + tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, + (unsigned long)hostdata); + + return 0; + + req_irq_failed: + do { + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while ((rc == H_Busy) || (H_isLongBusy(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; +} + +/** + * reset_crq_queue: - resets a crq after a failure + * @queue: crq_queue to initialize and register + * @hostdata: ibmvscsi_host_data of host + * + */ +void ibmvscsi_reset_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata) +{ + int rc; + struct vio_dev *vdev = to_vio_dev(hostdata->dev); + + /* Close the CRQ */ + do { + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while ((rc == H_Busy) || (H_isLongBusy(rc))); + + /* Clean out the queue */ + memset(queue->msgs, 0x00, PAGE_SIZE); + queue->cur = 0; + + /* 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 */ + printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n"); + } else if (rc != 0) { + printk(KERN_WARNING + "ibmvscsi: couldn't register crq--rc 0x%x\n", rc); + } +} diff --git a/drivers/scsi/ibmvscsi/srp.h b/drivers/scsi/ibmvscsi/srp.h new file mode 100644 index 00000000000..e952c1cd974 --- /dev/null +++ b/drivers/scsi/ibmvscsi/srp.h @@ -0,0 +1,225 @@ +/*****************************************************************************/ +/* srp.h -- SCSI RDMA Protocol definitions */ +/* */ +/* Written By: Colin Devilbis, IBM Corporation */ +/* */ +/* Copyright (C) 2003 IBM Corporation */ +/* */ +/* 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 */ +/* */ +/* */ +/* This file contains structures and definitions for the SCSI RDMA Protocol */ +/* (SRP) as defined in the T10 standard available at www.t10.org. This */ +/* file was based on the 16a version of the standard */ +/* */ +/*****************************************************************************/ +#ifndef SRP_H +#define SRP_H + +#define PACKED __attribute__((packed)) + +enum srp_types { + SRP_LOGIN_REQ_TYPE = 0x00, + SRP_LOGIN_RSP_TYPE = 0xC0, + SRP_LOGIN_REJ_TYPE = 0x80, + SRP_I_LOGOUT_TYPE = 0x03, + SRP_T_LOGOUT_TYPE = 0x80, + SRP_TSK_MGMT_TYPE = 0x01, + SRP_CMD_TYPE = 0x02, + SRP_RSP_TYPE = 0xC1, + SRP_CRED_REQ_TYPE = 0x81, + SRP_CRED_RSP_TYPE = 0x41, + SRP_AER_REQ_TYPE = 0x82, + SRP_AER_RSP_TYPE = 0x42 +}; + +enum srp_descriptor_formats { + SRP_NO_BUFFER = 0x00, + SRP_DIRECT_BUFFER = 0x01, + SRP_INDIRECT_BUFFER = 0x02 +}; + +struct memory_descriptor { + u64 virtual_address; + u32 memory_handle; + u32 length; +}; + +struct indirect_descriptor { + struct memory_descriptor head; + u32 total_length; + struct memory_descriptor list[1] PACKED; +}; + +struct srp_generic { + u8 type; + u8 reserved1[7]; + u64 tag; +}; + +struct srp_login_req { + u8 type; + u8 reserved1[7]; + u64 tag; + u32 max_requested_initiator_to_target_iulen; + u32 reserved2; + u16 required_buffer_formats; + u8 reserved3:6; + u8 multi_channel_action:2; + u8 reserved4; + u32 reserved5; + u8 initiator_port_identifier[16]; + u8 target_port_identifier[16]; +}; + +struct srp_login_rsp { + u8 type; + u8 reserved1[3]; + u32 request_limit_delta; + u64 tag; + u32 max_initiator_to_target_iulen; + u32 max_target_to_initiator_iulen; + u16 supported_buffer_formats; + u8 reserved2:6; + u8 multi_channel_result:2; + u8 reserved3; + u8 reserved4[24]; +}; + +struct srp_login_rej { + u8 type; + u8 reserved1[3]; + u32 reason; + u64 tag; + u64 reserved2; + u16 supported_buffer_formats; + u8 reserved3[6]; +}; + +struct srp_i_logout { + u8 type; + u8 reserved1[7]; + u64 tag; +}; + +struct srp_t_logout { + u8 type; + u8 reserved1[3]; + u32 reason; + u64 tag; +}; + +struct srp_tsk_mgmt { + u8 type; + u8 reserved1[7]; + u64 tag; + u32 reserved2; + u64 lun PACKED; + u8 reserved3; + u8 reserved4; + u8 task_mgmt_flags; + u8 reserved5; + u64 managed_task_tag; + u64 reserved6; +}; + +struct srp_cmd { + u8 type; + u32 reserved1 PACKED; + u8 data_out_format:4; + u8 data_in_format:4; + u8 data_out_count; + u8 data_in_count; + u64 tag; + u32 reserved2; + u64 lun PACKED; + u8 reserved3; + u8 reserved4:5; + u8 task_attribute:3; + u8 reserved5; + u8 additional_cdb_len; + u8 cdb[16]; + u8 additional_data[0x100 - 0x30]; +}; + +struct srp_rsp { + u8 type; + u8 reserved1[3]; + u32 request_limit_delta; + u64 tag; + u16 reserved2; + u8 reserved3:2; + u8 diunder:1; + u8 diover:1; + u8 dounder:1; + u8 doover:1; + u8 snsvalid:1; + u8 rspvalid:1; + u8 status; + u32 data_in_residual_count; + u32 data_out_residual_count; + u32 sense_data_list_length; + u32 response_data_list_length; + u8 sense_and_response_data[18]; +}; + +struct srp_cred_req { + u8 type; + u8 reserved1[3]; + u32 request_limit_delta; + u64 tag; +}; + +struct srp_cred_rsp { + u8 type; + u8 reserved1[7]; + u64 tag; +}; + +struct srp_aer_req { + u8 type; + u8 reserved1[3]; + u32 request_limit_delta; + u64 tag; + u32 reserved2; + u64 lun; + u32 sense_data_list_length; + u32 reserved3; + u8 sense_data[20]; +}; + +struct srp_aer_rsp { + u8 type; + u8 reserved1[7]; + u64 tag; +}; + +union srp_iu { + struct srp_generic generic; + struct srp_login_req login_req; + struct srp_login_rsp login_rsp; + struct srp_login_rej login_rej; + struct srp_i_logout i_logout; + struct srp_t_logout t_logout; + struct srp_tsk_mgmt tsk_mgmt; + struct srp_cmd cmd; + struct srp_rsp rsp; + struct srp_cred_req cred_req; + struct srp_cred_rsp cred_rsp; + struct srp_aer_req aer_req; + struct srp_aer_rsp aer_rsp; +}; + +#endif diff --git a/drivers/scsi/ibmvscsi/viosrp.h b/drivers/scsi/ibmvscsi/viosrp.h new file mode 100644 index 00000000000..6a6bba8a2f3 --- /dev/null +++ b/drivers/scsi/ibmvscsi/viosrp.h @@ -0,0 +1,126 @@ +/*****************************************************************************/ +/* srp.h -- SCSI RDMA Protocol definitions */ +/* */ +/* Written By: Colin Devilbis, IBM Corporation */ +/* */ +/* Copyright (C) 2003 IBM Corporation */ +/* */ +/* 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 */ +/* */ +/* */ +/* This file contains structures and definitions for IBM RPA (RS/6000 */ +/* platform architecture) implementation of the SRP (SCSI RDMA Protocol) */ +/* standard. SRP is used on IBM iSeries and pSeries platforms to send SCSI */ +/* commands between logical partitions. */ +/* */ +/* SRP Information Units (IUs) are sent on a "Command/Response Queue" (CRQ) */ +/* between partitions. The definitions in this file are architected, */ +/* and cannot be changed without breaking compatibility with other versions */ +/* of Linux and other operating systems (AIX, OS/400) that talk this protocol*/ +/* between logical partitions */ +/*****************************************************************************/ +#ifndef VIOSRP_H +#define VIOSRP_H +#include "srp.h" + +enum viosrp_crq_formats { + VIOSRP_SRP_FORMAT = 0x01, + VIOSRP_MAD_FORMAT = 0x02, + VIOSRP_OS400_FORMAT = 0x03, + VIOSRP_AIX_FORMAT = 0x04, + VIOSRP_LINUX_FORMAT = 0x06, + VIOSRP_INLINE_FORMAT = 0x07 +}; + +struct viosrp_crq { + u8 valid; /* used by RPA */ + u8 format; /* SCSI vs out-of-band */ + u8 reserved; + u8 status; /* non-scsi failure? (e.g. DMA failure) */ + u16 timeout; /* in seconds */ + u16 IU_length; /* in bytes */ + u64 IU_data_ptr; /* the TCE for transferring data */ +}; + +/* MADs are Management requests above and beyond the IUs defined in the SRP + * standard. + */ +enum viosrp_mad_types { + VIOSRP_EMPTY_IU_TYPE = 0x01, + VIOSRP_ERROR_LOG_TYPE = 0x02, + VIOSRP_ADAPTER_INFO_TYPE = 0x03, + VIOSRP_HOST_CONFIG_TYPE = 0x04 +}; + +/* + * Common MAD header + */ +struct mad_common { + u32 type; + u16 status; + u16 length; + u64 tag; +}; + +/* + * All SRP (and MAD) requests normally flow from the + * client to the server. There is no way for the server to send + * an asynchronous message back to the client. The Empty IU is used + * to hang out a meaningless request to the server so that it can respond + * asynchrouously with something like a SCSI AER + */ +struct viosrp_empty_iu { + struct mad_common common; + u64 buffer; + u32 port; +}; + +struct viosrp_error_log { + struct mad_common common; + u64 buffer; +}; + +struct viosrp_adapter_info { + struct mad_common common; + u64 buffer; +}; + +struct viosrp_host_config { + struct mad_common common; + u64 buffer; +}; + +union mad_iu { + struct viosrp_empty_iu empty_iu; + struct viosrp_error_log error_log; + struct viosrp_adapter_info adapter_info; + struct viosrp_host_config host_config; +}; + +union viosrp_iu { + union srp_iu srp; + union mad_iu mad; +}; + +struct mad_adapter_info_data { + char srp_version[8]; + char partition_name[96]; + u32 partition_number; + u32 mad_version; + u32 os_type; + u32 port_max_txu[8]; /* per-port maximum transfer */ +}; + +#endif |