2381 lines
68 KiB
C
2381 lines
68 KiB
C
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/* ------------------------------------------------------------
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* ibmvscsi.c
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* (C) Copyright IBM Corporation 1994, 2004
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* Authors: Colin DeVilbiss (devilbis@us.ibm.com)
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* Santiago Leon (santil@us.ibm.com)
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* Dave Boutcher (sleddog@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* ------------------------------------------------------------
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* Emulation of a SCSI host adapter for Virtual I/O devices
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*
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* This driver supports the SCSI adapter implemented by the IBM
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* Power5 firmware. That SCSI adapter is not a physical adapter,
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* but allows Linux SCSI peripheral drivers to directly
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* access devices in another logical partition on the physical system.
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*
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* The virtual adapter(s) are present in the open firmware device
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* tree just like real adapters.
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*
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* One of the capabilities provided on these systems is the ability
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* to DMA between partitions. The architecture states that for VSCSI,
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* the server side is allowed to DMA to and from the client. The client
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* is never trusted to DMA to or from the server directly.
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*
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* Messages are sent between partitions on a "Command/Response Queue"
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* (CRQ), which is just a buffer of 16 byte entries in the receiver's
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* Senders cannot access the buffer directly, but send messages by
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* making a hypervisor call and passing in the 16 bytes. The hypervisor
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* puts the message in the next 16 byte space in round-robin fashion,
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* turns on the high order bit of the message (the valid bit), and
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* generates an interrupt to the receiver (if interrupts are turned on.)
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* The receiver just turns off the valid bit when they have copied out
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* the message.
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*
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* The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
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* (IU) (as defined in the T10 standard available at www.t10.org), gets
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* a DMA address for the message, and sends it to the server as the
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* payload of a CRQ message. The server DMAs the SRP IU and processes it,
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* including doing any additional data transfers. When it is done, it
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* DMAs the SRP response back to the same address as the request came from,
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* and sends a CRQ message back to inform the client that the request has
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* completed.
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*
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* TODO: This is currently pretty tied to the IBM pSeries hypervisor
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* interfaces. It would be really nice to abstract this above an RDMA
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* layer.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/pm.h>
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#include <linux/kthread.h>
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#include <asm/firmware.h>
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#include <asm/vio.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_transport_srp.h>
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#include "ibmvscsi.h"
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/* The values below are somewhat arbitrary default values, but
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* OS/400 will use 3 busses (disks, CDs, tapes, I think.)
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* Note that there are 3 bits of channel value, 6 bits of id, and
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* 5 bits of LUN.
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*/
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static int max_id = 64;
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static int max_channel = 3;
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static int init_timeout = 300;
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static int login_timeout = 60;
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static int info_timeout = 30;
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static int abort_timeout = 60;
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static int reset_timeout = 60;
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static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
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static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
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static int fast_fail = 1;
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static int client_reserve = 1;
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static char partition_name[96] = "UNKNOWN";
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static unsigned int partition_number = -1;
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static struct scsi_transport_template *ibmvscsi_transport_template;
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#define IBMVSCSI_VERSION "1.5.9"
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MODULE_DESCRIPTION("IBM Virtual SCSI");
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MODULE_AUTHOR("Dave Boutcher");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(IBMVSCSI_VERSION);
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module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]");
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module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]");
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module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
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module_param_named(max_requests, max_requests, int, S_IRUGO);
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MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
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module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
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module_param_named(client_reserve, client_reserve, int, S_IRUGO );
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MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
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static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
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struct ibmvscsi_host_data *hostdata);
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/* ------------------------------------------------------------
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* Routines for managing the command/response queue
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*/
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/**
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* ibmvscsi_handle_event: - Interrupt handler for crq events
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* @irq: number of irq to handle, not used
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* @dev_instance: ibmvscsi_host_data of host that received interrupt
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*
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* Disables interrupts and schedules srp_task
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* Always returns IRQ_HANDLED
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*/
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static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
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{
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struct ibmvscsi_host_data *hostdata =
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(struct ibmvscsi_host_data *)dev_instance;
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vio_disable_interrupts(to_vio_dev(hostdata->dev));
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tasklet_schedule(&hostdata->srp_task);
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return IRQ_HANDLED;
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}
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/**
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* release_crq_queue: - Deallocates data and unregisters CRQ
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* @queue: crq_queue to initialize and register
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* @host_data: ibmvscsi_host_data of host
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*
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* Frees irq, deallocates a page for messages, unmaps dma, and unregisters
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* the crq with the hypervisor.
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*/
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static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
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struct ibmvscsi_host_data *hostdata,
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int max_requests)
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{
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long rc = 0;
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struct vio_dev *vdev = to_vio_dev(hostdata->dev);
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free_irq(vdev->irq, (void *)hostdata);
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tasklet_kill(&hostdata->srp_task);
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do {
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if (rc)
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msleep(100);
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rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
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} while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
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dma_unmap_single(hostdata->dev,
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queue->msg_token,
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queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
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free_page((unsigned long)queue->msgs);
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}
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/**
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* crq_queue_next_crq: - Returns the next entry in message queue
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* @queue: crq_queue to use
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*
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* Returns pointer to next entry in queue, or NULL if there are no new
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* entried in the CRQ.
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*/
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static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
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{
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struct viosrp_crq *crq;
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unsigned long flags;
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spin_lock_irqsave(&queue->lock, flags);
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crq = &queue->msgs[queue->cur];
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if (crq->valid != VIOSRP_CRQ_FREE) {
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if (++queue->cur == queue->size)
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queue->cur = 0;
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/* Ensure the read of the valid bit occurs before reading any
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* other bits of the CRQ entry
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*/
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rmb();
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} else
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crq = NULL;
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spin_unlock_irqrestore(&queue->lock, flags);
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return crq;
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}
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/**
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* ibmvscsi_send_crq: - Send a CRQ
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* @hostdata: the adapter
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* @word1: the first 64 bits of the data
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* @word2: the second 64 bits of the data
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*/
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static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
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u64 word1, u64 word2)
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{
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struct vio_dev *vdev = to_vio_dev(hostdata->dev);
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/*
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* Ensure the command buffer is flushed to memory before handing it
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* over to the VIOS to prevent it from fetching any stale data.
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*/
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mb();
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return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
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}
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/**
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* ibmvscsi_task: - Process srps asynchronously
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* @data: ibmvscsi_host_data of host
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*/
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static void ibmvscsi_task(void *data)
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{
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struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
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struct vio_dev *vdev = to_vio_dev(hostdata->dev);
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struct viosrp_crq *crq;
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int done = 0;
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||
|
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||
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while (!done) {
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/* Pull all the valid messages off the CRQ */
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while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
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ibmvscsi_handle_crq(crq, hostdata);
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crq->valid = VIOSRP_CRQ_FREE;
|
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|
}
|
||
|
|
||
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vio_enable_interrupts(vdev);
|
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|
crq = crq_queue_next_crq(&hostdata->queue);
|
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if (crq != NULL) {
|
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|
vio_disable_interrupts(vdev);
|
||
|
ibmvscsi_handle_crq(crq, hostdata);
|
||
|
crq->valid = VIOSRP_CRQ_FREE;
|
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|
} else {
|
||
|
done = 1;
|
||
|
}
|
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|
}
|
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|
}
|
||
|
|
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static void gather_partition_info(void)
|
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|
{
|
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const char *ppartition_name;
|
||
|
const __be32 *p_number_ptr;
|
||
|
|
||
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/* Retrieve information about this partition */
|
||
|
if (!of_root)
|
||
|
return;
|
||
|
|
||
|
of_node_get(of_root);
|
||
|
|
||
|
ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
|
||
|
if (ppartition_name)
|
||
|
strlcpy(partition_name, ppartition_name,
|
||
|
sizeof(partition_name));
|
||
|
p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
|
||
|
if (p_number_ptr)
|
||
|
partition_number = of_read_number(p_number_ptr, 1);
|
||
|
of_node_put(of_root);
|
||
|
}
|
||
|
|
||
|
static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
memset(&hostdata->madapter_info, 0x00,
|
||
|
sizeof(hostdata->madapter_info));
|
||
|
|
||
|
dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
|
||
|
strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
|
||
|
|
||
|
strncpy(hostdata->madapter_info.partition_name, partition_name,
|
||
|
sizeof(hostdata->madapter_info.partition_name));
|
||
|
|
||
|
hostdata->madapter_info.partition_number =
|
||
|
cpu_to_be32(partition_number);
|
||
|
|
||
|
hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);
|
||
|
hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* reset_crq_queue: - resets a crq after a failure
|
||
|
* @queue: crq_queue to initialize and register
|
||
|
* @hostdata: ibmvscsi_host_data of host
|
||
|
*
|
||
|
*/
|
||
|
static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
|
||
|
struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
int rc = 0;
|
||
|
struct vio_dev *vdev = to_vio_dev(hostdata->dev);
|
||
|
|
||
|
/* Close the CRQ */
|
||
|
do {
|
||
|
if (rc)
|
||
|
msleep(100);
|
||
|
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
|
||
|
} while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
|
||
|
|
||
|
/* Clean out the queue */
|
||
|
memset(queue->msgs, 0x00, PAGE_SIZE);
|
||
|
queue->cur = 0;
|
||
|
|
||
|
set_adapter_info(hostdata);
|
||
|
|
||
|
/* And re-open it again */
|
||
|
rc = plpar_hcall_norets(H_REG_CRQ,
|
||
|
vdev->unit_address,
|
||
|
queue->msg_token, PAGE_SIZE);
|
||
|
if (rc == H_CLOSED) {
|
||
|
/* Adapter is good, but other end is not ready */
|
||
|
dev_warn(hostdata->dev, "Partner adapter not ready\n");
|
||
|
} else if (rc != 0) {
|
||
|
dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
|
||
|
}
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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 == H_CLOSED) {
|
||
|
/* Adapter is good, but other end is not ready */
|
||
|
dev_warn(hostdata->dev, "Partner adapter not ready\n");
|
||
|
retrc = 0;
|
||
|
} else if (rc != 0) {
|
||
|
dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
|
||
|
goto reg_crq_failed;
|
||
|
}
|
||
|
|
||
|
queue->cur = 0;
|
||
|
spin_lock_init(&queue->lock);
|
||
|
|
||
|
tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
|
||
|
(unsigned long)hostdata);
|
||
|
|
||
|
if (request_irq(vdev->irq,
|
||
|
ibmvscsi_handle_event,
|
||
|
0, "ibmvscsi", (void *)hostdata) != 0) {
|
||
|
dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
|
||
|
vdev->irq);
|
||
|
goto req_irq_failed;
|
||
|
}
|
||
|
|
||
|
rc = vio_enable_interrupts(vdev);
|
||
|
if (rc != 0) {
|
||
|
dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
|
||
|
goto req_irq_failed;
|
||
|
}
|
||
|
|
||
|
return retrc;
|
||
|
|
||
|
req_irq_failed:
|
||
|
tasklet_kill(&hostdata->srp_task);
|
||
|
rc = 0;
|
||
|
do {
|
||
|
if (rc)
|
||
|
msleep(100);
|
||
|
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
|
||
|
} while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
|
||
|
reg_crq_failed:
|
||
|
dma_unmap_single(hostdata->dev,
|
||
|
queue->msg_token,
|
||
|
queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
|
||
|
map_failed:
|
||
|
free_page((unsigned long)queue->msgs);
|
||
|
malloc_failed:
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* reenable_crq_queue: - reenables a crq after
|
||
|
* @queue: crq_queue to initialize and register
|
||
|
* @hostdata: ibmvscsi_host_data of host
|
||
|
*
|
||
|
*/
|
||
|
static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
|
||
|
struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
int rc = 0;
|
||
|
struct vio_dev *vdev = to_vio_dev(hostdata->dev);
|
||
|
|
||
|
set_adapter_info(hostdata);
|
||
|
|
||
|
/* Re-enable the CRQ */
|
||
|
do {
|
||
|
if (rc)
|
||
|
msleep(100);
|
||
|
rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
|
||
|
} while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
|
||
|
|
||
|
if (rc)
|
||
|
dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
/* ------------------------------------------------------------
|
||
|
* Routines for the event pool and event structs
|
||
|
*/
|
||
|
/**
|
||
|
* initialize_event_pool: - Allocates and initializes the event pool for a host
|
||
|
* @pool: event_pool to be initialized
|
||
|
* @size: Number of events in pool
|
||
|
* @hostdata: ibmvscsi_host_data who owns the event pool
|
||
|
*
|
||
|
* Returns zero on success.
|
||
|
*/
|
||
|
static int initialize_event_pool(struct event_pool *pool,
|
||
|
int size, struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
int i;
|
||
|
|
||
|
pool->size = size;
|
||
|
pool->next = 0;
|
||
|
pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
|
||
|
if (!pool->events)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
pool->iu_storage =
|
||
|
dma_alloc_coherent(hostdata->dev,
|
||
|
pool->size * sizeof(*pool->iu_storage),
|
||
|
&pool->iu_token, 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 = VIOSRP_CRQ_CMD_RSP;
|
||
|
evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
|
||
|
evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
|
||
|
sizeof(*evt->xfer_iu) * i);
|
||
|
evt->xfer_iu = pool->iu_storage + i;
|
||
|
evt->hostdata = hostdata;
|
||
|
evt->ext_list = NULL;
|
||
|
evt->ext_list_token = 0;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* release_event_pool: - Frees memory of an event pool of a host
|
||
|
* @pool: event_pool to be released
|
||
|
* @hostdata: ibmvscsi_host_data who owns the even pool
|
||
|
*
|
||
|
* Returns zero on success.
|
||
|
*/
|
||
|
static void release_event_pool(struct event_pool *pool,
|
||
|
struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
int i, in_use = 0;
|
||
|
for (i = 0; i < pool->size; ++i) {
|
||
|
if (atomic_read(&pool->events[i].free) != 1)
|
||
|
++in_use;
|
||
|
if (pool->events[i].ext_list) {
|
||
|
dma_free_coherent(hostdata->dev,
|
||
|
SG_ALL * sizeof(struct srp_direct_buf),
|
||
|
pool->events[i].ext_list,
|
||
|
pool->events[i].ext_list_token);
|
||
|
}
|
||
|
}
|
||
|
if (in_use)
|
||
|
dev_warn(hostdata->dev, "releasing event pool with %d "
|
||
|
"events still in use?\n", in_use);
|
||
|
kfree(pool->events);
|
||
|
dma_free_coherent(hostdata->dev,
|
||
|
pool->size * sizeof(*pool->iu_storage),
|
||
|
pool->iu_storage, pool->iu_token);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* valid_event_struct: - Determines if event is valid.
|
||
|
* @pool: event_pool that contains the event
|
||
|
* @evt: srp_event_struct to be checked for validity
|
||
|
*
|
||
|
* Returns zero if event is invalid, one otherwise.
|
||
|
*/
|
||
|
static int valid_event_struct(struct event_pool *pool,
|
||
|
struct srp_event_struct *evt)
|
||
|
{
|
||
|
int index = evt - pool->events;
|
||
|
if (index < 0 || index >= pool->size) /* outside of bounds */
|
||
|
return 0;
|
||
|
if (evt != pool->events + index) /* unaligned */
|
||
|
return 0;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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 = cpu_to_be16(timeout);
|
||
|
evt_struct->done = done;
|
||
|
}
|
||
|
|
||
|
/* ------------------------------------------------------------
|
||
|
* Routines for receiving SCSI responses from the hosting partition
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* set_srp_direction: Set the fields in the srp related to data
|
||
|
* direction and number of buffers based on the direction in
|
||
|
* the scsi_cmnd and the number of buffers
|
||
|
*/
|
||
|
static void set_srp_direction(struct scsi_cmnd *cmd,
|
||
|
struct srp_cmd *srp_cmd,
|
||
|
int numbuf)
|
||
|
{
|
||
|
u8 fmt;
|
||
|
|
||
|
if (numbuf == 0)
|
||
|
return;
|
||
|
|
||
|
if (numbuf == 1)
|
||
|
fmt = SRP_DATA_DESC_DIRECT;
|
||
|
else {
|
||
|
fmt = SRP_DATA_DESC_INDIRECT;
|
||
|
numbuf = min(numbuf, MAX_INDIRECT_BUFS);
|
||
|
|
||
|
if (cmd->sc_data_direction == DMA_TO_DEVICE)
|
||
|
srp_cmd->data_out_desc_cnt = numbuf;
|
||
|
else
|
||
|
srp_cmd->data_in_desc_cnt = numbuf;
|
||
|
}
|
||
|
|
||
|
if (cmd->sc_data_direction == DMA_TO_DEVICE)
|
||
|
srp_cmd->buf_fmt = fmt << 4;
|
||
|
else
|
||
|
srp_cmd->buf_fmt = fmt;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
|
||
|
* @cmd: srp_cmd whose additional_data member will be unmapped
|
||
|
* @dev: device for which the memory is mapped
|
||
|
*
|
||
|
*/
|
||
|
static void unmap_cmd_data(struct srp_cmd *cmd,
|
||
|
struct srp_event_struct *evt_struct,
|
||
|
struct device *dev)
|
||
|
{
|
||
|
u8 out_fmt, in_fmt;
|
||
|
|
||
|
out_fmt = cmd->buf_fmt >> 4;
|
||
|
in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
|
||
|
|
||
|
if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
|
||
|
return;
|
||
|
|
||
|
if (evt_struct->cmnd)
|
||
|
scsi_dma_unmap(evt_struct->cmnd);
|
||
|
}
|
||
|
|
||
|
static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
|
||
|
struct srp_direct_buf *md)
|
||
|
{
|
||
|
int i;
|
||
|
struct scatterlist *sg;
|
||
|
u64 total_length = 0;
|
||
|
|
||
|
scsi_for_each_sg(cmd, sg, nseg, i) {
|
||
|
struct srp_direct_buf *descr = md + i;
|
||
|
descr->va = cpu_to_be64(sg_dma_address(sg));
|
||
|
descr->len = cpu_to_be32(sg_dma_len(sg));
|
||
|
descr->key = 0;
|
||
|
total_length += sg_dma_len(sg);
|
||
|
}
|
||
|
return total_length;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* map_sg_data: - Maps dma for a scatterlist and initializes 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 = cpu_to_be32(sg_mapped *
|
||
|
sizeof(struct srp_direct_buf));
|
||
|
indirect->table_desc.key = 0;
|
||
|
|
||
|
if (sg_mapped <= MAX_INDIRECT_BUFS) {
|
||
|
total_length = map_sg_list(cmd, sg_mapped,
|
||
|
&indirect->desc_list[0]);
|
||
|
indirect->len = cpu_to_be32(total_length);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
/* get indirect table */
|
||
|
if (!evt_struct->ext_list) {
|
||
|
evt_struct->ext_list = (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 = cpu_to_be32(total_length);
|
||
|
indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);
|
||
|
indirect->table_desc.len = cpu_to_be32(sg_mapped *
|
||
|
sizeof(indirect->desc_list[0]));
|
||
|
memcpy(indirect->desc_list, evt_struct->ext_list,
|
||
|
MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* map_data_for_srp_cmd: - Calls functions to map data for srp cmds
|
||
|
* @cmd: struct scsi_cmnd with the memory to be mapped
|
||
|
* @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->crq.format != VIOSRP_MAD_FORMAT &&
|
||
|
evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
|
||
|
evt->done(evt);
|
||
|
free_event_struct(&evt->hostdata->pool, evt);
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
}
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ibmvscsi_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)
|
||
|
{
|
||
|
__be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;
|
||
|
int request_status = 0;
|
||
|
int rc;
|
||
|
int srp_req = 0;
|
||
|
|
||
|
/* If we have exhausted our request limit, just fail this request,
|
||
|
* unless it is for a reset or abort.
|
||
|
* Note that there are rare cases involving driver generated requests
|
||
|
* (such as task management requests) that the mid layer may think we
|
||
|
* can handle more requests (can_queue) when we actually can't
|
||
|
*/
|
||
|
if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
|
||
|
srp_req = 1;
|
||
|
request_status =
|
||
|
atomic_dec_if_positive(&hostdata->request_limit);
|
||
|
/* If request limit was -1 when we started, it is now even
|
||
|
* less than that
|
||
|
*/
|
||
|
if (request_status < -1)
|
||
|
goto send_error;
|
||
|
/* Otherwise, we may have run out of requests. */
|
||
|
/* If request limit was 0 when we started the adapter is in the
|
||
|
* process of performing a login with the server adapter, or
|
||
|
* we may have run out of requests.
|
||
|
*/
|
||
|
else if (request_status == -1 &&
|
||
|
evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
|
||
|
goto send_busy;
|
||
|
/* Abort and reset calls should make it through.
|
||
|
* Nothing except abort and reset should use the last two
|
||
|
* slots unless we had two or less to begin with.
|
||
|
*/
|
||
|
else if (request_status < 2 &&
|
||
|
evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
|
||
|
/* In the case that we have less than two requests
|
||
|
* available, check the server limit as a combination
|
||
|
* of the request limit and the number of requests
|
||
|
* in-flight (the size of the send list). If the
|
||
|
* server limit is greater than 2, return busy so
|
||
|
* that the last two are reserved for reset and abort.
|
||
|
*/
|
||
|
int server_limit = request_status;
|
||
|
struct srp_event_struct *tmp_evt;
|
||
|
|
||
|
list_for_each_entry(tmp_evt, &hostdata->sent, list) {
|
||
|
server_limit++;
|
||
|
}
|
||
|
|
||
|
if (server_limit > 2)
|
||
|
goto send_busy;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Copy the IU into the transfer area */
|
||
|
*evt_struct->xfer_iu = evt_struct->iu;
|
||
|
evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
|
||
|
|
||
|
/* Add this to the sent list. We need to do this
|
||
|
* before we actually send
|
||
|
* in case it comes back REALLY fast
|
||
|
*/
|
||
|
list_add_tail(&evt_struct->list, &hostdata->sent);
|
||
|
|
||
|
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);
|
||
|
}
|
||
|
|
||
|
rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),
|
||
|
be64_to_cpu(crq_as_u64[1]));
|
||
|
if (rc != 0) {
|
||
|
list_del(&evt_struct->list);
|
||
|
del_timer(&evt_struct->timer);
|
||
|
|
||
|
/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
|
||
|
* Firmware will send a CRQ with a transport event (0xFF) to
|
||
|
* tell this client what has happened to the transport. This
|
||
|
* will be handled in ibmvscsi_handle_crq()
|
||
|
*/
|
||
|
if (rc == H_CLOSED) {
|
||
|
dev_warn(hostdata->dev, "send warning. "
|
||
|
"Receive queue closed, will retry.\n");
|
||
|
goto send_busy;
|
||
|
}
|
||
|
dev_err(hostdata->dev, "send error %d\n", rc);
|
||
|
if (srp_req)
|
||
|
atomic_inc(&hostdata->request_limit);
|
||
|
goto send_error;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
send_busy:
|
||
|
unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
|
||
|
|
||
|
free_event_struct(&hostdata->pool, evt_struct);
|
||
|
if (srp_req && request_status != -1)
|
||
|
atomic_inc(&hostdata->request_limit);
|
||
|
return SCSI_MLQUEUE_HOST_BUSY;
|
||
|
|
||
|
send_error:
|
||
|
unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
|
||
|
|
||
|
if (evt_struct->cmnd != NULL) {
|
||
|
evt_struct->cmnd->result = DID_ERROR << 16;
|
||
|
evt_struct->cmnd_done(evt_struct->cmnd);
|
||
|
} else if (evt_struct->done)
|
||
|
evt_struct->done(evt_struct);
|
||
|
|
||
|
free_event_struct(&hostdata->pool, evt_struct);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* handle_cmd_rsp: - Handle responses from commands
|
||
|
* @evt_struct: srp_event_struct to be handled
|
||
|
*
|
||
|
* Used as a callback by when sending scsi cmds.
|
||
|
* Gets called by ibmvscsi_handle_crq()
|
||
|
*/
|
||
|
static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
|
||
|
{
|
||
|
struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
|
||
|
struct scsi_cmnd *cmnd = evt_struct->cmnd;
|
||
|
|
||
|
if (unlikely(rsp->opcode != SRP_RSP)) {
|
||
|
if (printk_ratelimit())
|
||
|
dev_warn(evt_struct->hostdata->dev,
|
||
|
"bad SRP RSP type %d\n", rsp->opcode);
|
||
|
}
|
||
|
|
||
|
if (cmnd) {
|
||
|
cmnd->result |= rsp->status;
|
||
|
if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
|
||
|
memcpy(cmnd->sense_buffer,
|
||
|
rsp->data,
|
||
|
be32_to_cpu(rsp->sense_data_len));
|
||
|
unmap_cmd_data(&evt_struct->iu.srp.cmd,
|
||
|
evt_struct,
|
||
|
evt_struct->hostdata->dev);
|
||
|
|
||
|
if (rsp->flags & SRP_RSP_FLAG_DOOVER)
|
||
|
scsi_set_resid(cmnd,
|
||
|
be32_to_cpu(rsp->data_out_res_cnt));
|
||
|
else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
|
||
|
scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));
|
||
|
}
|
||
|
|
||
|
if (evt_struct->cmnd_done)
|
||
|
evt_struct->cmnd_done(cmnd);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* lun_from_dev: - Returns the lun of the scsi device
|
||
|
* @dev: struct scsi_device
|
||
|
*
|
||
|
*/
|
||
|
static inline u16 lun_from_dev(struct scsi_device *dev)
|
||
|
{
|
||
|
return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ibmvscsi_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));
|
||
|
int_to_scsilun(lun, &srp_cmd->lun);
|
||
|
|
||
|
if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
|
||
|
if (!firmware_has_feature(FW_FEATURE_CMO))
|
||
|
sdev_printk(KERN_ERR, cmnd->device,
|
||
|
"couldn't convert cmd to srp_cmd\n");
|
||
|
free_event_struct(&hostdata->pool, evt_struct);
|
||
|
return SCSI_MLQUEUE_HOST_BUSY;
|
||
|
}
|
||
|
|
||
|
init_event_struct(evt_struct,
|
||
|
handle_cmd_rsp,
|
||
|
VIOSRP_SRP_FORMAT,
|
||
|
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 =
|
||
|
cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +
|
||
|
offsetof(struct srp_cmd, add_data) +
|
||
|
offsetof(struct srp_indirect_buf, desc_list));
|
||
|
}
|
||
|
|
||
|
return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
|
||
|
}
|
||
|
|
||
|
static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
|
||
|
|
||
|
/* ------------------------------------------------------------
|
||
|
* Routines for driver initialization
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* map_persist_bufs: - Pre-map persistent data for adapter logins
|
||
|
* @hostdata: ibmvscsi_host_data of host
|
||
|
*
|
||
|
* Map the capabilities and adapter info DMA buffers to avoid runtime failures.
|
||
|
* Return 1 on error, 0 on success.
|
||
|
*/
|
||
|
static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
|
||
|
hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
|
||
|
sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
|
||
|
|
||
|
if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
|
||
|
dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
|
||
|
&hostdata->madapter_info,
|
||
|
sizeof(hostdata->madapter_info),
|
||
|
DMA_BIDIRECTIONAL);
|
||
|
if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
|
||
|
dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
|
||
|
dma_unmap_single(hostdata->dev, hostdata->caps_addr,
|
||
|
sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* unmap_persist_bufs: - Unmap persistent data needed for adapter logins
|
||
|
* @hostdata: ibmvscsi_host_data of host
|
||
|
*
|
||
|
* Unmap the capabilities and adapter info DMA buffers
|
||
|
*/
|
||
|
static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
dma_unmap_single(hostdata->dev, hostdata->caps_addr,
|
||
|
sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
|
||
|
|
||
|
dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
|
||
|
sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* login_rsp: - Handle response to SRP login request
|
||
|
* @evt_struct: srp_event_struct with the response
|
||
|
*
|
||
|
* Used as a "done" callback by when sending srp_login. Gets called
|
||
|
* by ibmvscsi_handle_crq()
|
||
|
*/
|
||
|
static void login_rsp(struct srp_event_struct *evt_struct)
|
||
|
{
|
||
|
struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
|
||
|
switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
|
||
|
case SRP_LOGIN_RSP: /* it worked! */
|
||
|
break;
|
||
|
case SRP_LOGIN_REJ: /* refused! */
|
||
|
dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
|
||
|
evt_struct->xfer_iu->srp.login_rej.reason);
|
||
|
/* Login failed. */
|
||
|
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,
|
||
|
be32_to_cpu(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 = cpu_to_be32(sizeof(union srp_iu));
|
||
|
login->req_buf_fmt = cpu_to_be16(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 !=
|
||
|
cpu_to_be16(SERVER_SUPPORTS_CAP))
|
||
|
dev_info(hostdata->dev, "Partition migration not supported\n");
|
||
|
|
||
|
if (client_reserve) {
|
||
|
if (hostdata->caps.reserve.common.server_support ==
|
||
|
cpu_to_be16(SERVER_SUPPORTS_CAP))
|
||
|
dev_info(hostdata->dev, "Client reserve enabled\n");
|
||
|
else
|
||
|
dev_info(hostdata->dev, "Client reserve not supported\n");
|
||
|
}
|
||
|
}
|
||
|
|
||
|
send_srp_login(hostdata);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* send_mad_capabilities: - Sends the mad capabilities request
|
||
|
* and stores the result so it can be retrieved with
|
||
|
* @hostdata: ibmvscsi_host_data of host
|
||
|
*/
|
||
|
static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
struct viosrp_capabilities *req;
|
||
|
struct srp_event_struct *evt_struct;
|
||
|
unsigned long flags;
|
||
|
struct device_node *of_node = hostdata->dev->of_node;
|
||
|
const char *location;
|
||
|
|
||
|
evt_struct = get_event_struct(&hostdata->pool);
|
||
|
BUG_ON(!evt_struct);
|
||
|
|
||
|
init_event_struct(evt_struct, capabilities_rsp,
|
||
|
VIOSRP_MAD_FORMAT, info_timeout);
|
||
|
|
||
|
req = &evt_struct->iu.mad.capabilities;
|
||
|
memset(req, 0, sizeof(*req));
|
||
|
|
||
|
hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);
|
||
|
if (hostdata->client_migrated)
|
||
|
hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
|
||
|
|
||
|
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 = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
|
||
|
req->buffer = cpu_to_be64(hostdata->caps_addr);
|
||
|
|
||
|
hostdata->caps.migration.common.cap_type =
|
||
|
cpu_to_be32(MIGRATION_CAPABILITIES);
|
||
|
hostdata->caps.migration.common.length =
|
||
|
cpu_to_be16(sizeof(hostdata->caps.migration));
|
||
|
hostdata->caps.migration.common.server_support =
|
||
|
cpu_to_be16(SERVER_SUPPORTS_CAP);
|
||
|
hostdata->caps.migration.ecl = cpu_to_be32(1);
|
||
|
|
||
|
if (client_reserve) {
|
||
|
hostdata->caps.reserve.common.cap_type =
|
||
|
cpu_to_be32(RESERVATION_CAPABILITIES);
|
||
|
hostdata->caps.reserve.common.length =
|
||
|
cpu_to_be16(sizeof(hostdata->caps.reserve));
|
||
|
hostdata->caps.reserve.common.server_support =
|
||
|
cpu_to_be16(SERVER_SUPPORTS_CAP);
|
||
|
hostdata->caps.reserve.type =
|
||
|
cpu_to_be32(CLIENT_RESERVE_SCSI_2);
|
||
|
req->common.length =
|
||
|
cpu_to_be16(sizeof(hostdata->caps));
|
||
|
} else
|
||
|
req->common.length = cpu_to_be16(sizeof(hostdata->caps) -
|
||
|
sizeof(hostdata->caps.reserve));
|
||
|
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
|
||
|
dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* fast_fail_rsp: - Handle response to MAD enable fast fail
|
||
|
* @evt_struct: srp_event_struct with the response
|
||
|
*
|
||
|
* Used as a "done" callback by when sending enable fast fail. Gets called
|
||
|
* by ibmvscsi_handle_crq()
|
||
|
*/
|
||
|
static void fast_fail_rsp(struct srp_event_struct *evt_struct)
|
||
|
{
|
||
|
struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
|
||
|
u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);
|
||
|
|
||
|
if (status == VIOSRP_MAD_NOT_SUPPORTED)
|
||
|
dev_err(hostdata->dev, "fast_fail not supported in server\n");
|
||
|
else if (status == VIOSRP_MAD_FAILED)
|
||
|
dev_err(hostdata->dev, "fast_fail request failed\n");
|
||
|
else if (status != VIOSRP_MAD_SUCCESS)
|
||
|
dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
|
||
|
|
||
|
send_mad_capabilities(hostdata);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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 = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);
|
||
|
fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));
|
||
|
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* adapter_info_rsp: - Handle response to MAD adapter info request
|
||
|
* @evt_struct: srp_event_struct with the response
|
||
|
*
|
||
|
* Used as a "done" callback by when sending adapter_info. Gets called
|
||
|
* by ibmvscsi_handle_crq()
|
||
|
*/
|
||
|
static void adapter_info_rsp(struct srp_event_struct *evt_struct)
|
||
|
{
|
||
|
struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
|
||
|
|
||
|
if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
|
||
|
dev_err(hostdata->dev, "error %d getting adapter info\n",
|
||
|
evt_struct->xfer_iu->mad.adapter_info.common.status);
|
||
|
} else {
|
||
|
dev_info(hostdata->dev, "host srp version: %s, "
|
||
|
"host partition %s (%d), OS %d, max io %u\n",
|
||
|
hostdata->madapter_info.srp_version,
|
||
|
hostdata->madapter_info.partition_name,
|
||
|
be32_to_cpu(hostdata->madapter_info.partition_number),
|
||
|
be32_to_cpu(hostdata->madapter_info.os_type),
|
||
|
be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
|
||
|
|
||
|
if (hostdata->madapter_info.port_max_txu[0])
|
||
|
hostdata->host->max_sectors =
|
||
|
be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;
|
||
|
|
||
|
if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&
|
||
|
strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
|
||
|
dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
|
||
|
hostdata->madapter_info.srp_version);
|
||
|
dev_err(hostdata->dev, "limiting scatterlists to %d\n",
|
||
|
MAX_INDIRECT_BUFS);
|
||
|
hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
|
||
|
}
|
||
|
|
||
|
if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {
|
||
|
enable_fast_fail(hostdata);
|
||
|
return;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
send_srp_login(hostdata);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* send_mad_adapter_info: - Sends the mad adapter info request
|
||
|
* and stores the result so it can be retrieved with
|
||
|
* sysfs. We COULD consider causing a failure if the
|
||
|
* returned SRP version doesn't match ours.
|
||
|
* @hostdata: ibmvscsi_host_data of host
|
||
|
*
|
||
|
* Returns zero if successful.
|
||
|
*/
|
||
|
static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
struct viosrp_adapter_info *req;
|
||
|
struct srp_event_struct *evt_struct;
|
||
|
unsigned long flags;
|
||
|
|
||
|
evt_struct = get_event_struct(&hostdata->pool);
|
||
|
BUG_ON(!evt_struct);
|
||
|
|
||
|
init_event_struct(evt_struct,
|
||
|
adapter_info_rsp,
|
||
|
VIOSRP_MAD_FORMAT,
|
||
|
info_timeout);
|
||
|
|
||
|
req = &evt_struct->iu.mad.adapter_info;
|
||
|
memset(req, 0x00, sizeof(*req));
|
||
|
|
||
|
req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);
|
||
|
req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));
|
||
|
req->buffer = cpu_to_be64(hostdata->adapter_info_addr);
|
||
|
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
|
||
|
dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* init_adapter: Start virtual adapter initialization sequence
|
||
|
*
|
||
|
*/
|
||
|
static void init_adapter(struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
send_mad_adapter_info(hostdata);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* sync_completion: Signal that a synchronous command has completed
|
||
|
* Note that after returning from this call, the evt_struct is freed.
|
||
|
* the caller waiting on this completion shouldn't touch the evt_struct
|
||
|
* again.
|
||
|
*/
|
||
|
static void sync_completion(struct srp_event_struct *evt_struct)
|
||
|
{
|
||
|
/* copy the response back */
|
||
|
if (evt_struct->sync_srp)
|
||
|
*evt_struct->sync_srp = *evt_struct->xfer_iu;
|
||
|
|
||
|
complete(&evt_struct->comp);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ibmvscsi_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;
|
||
|
int_to_scsilun(lun, &tsk_mgmt->lun);
|
||
|
tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
|
||
|
tsk_mgmt->task_tag = (u64) found_evt;
|
||
|
|
||
|
evt->sync_srp = &srp_rsp;
|
||
|
|
||
|
init_completion(&evt->comp);
|
||
|
rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
|
||
|
|
||
|
if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
|
||
|
break;
|
||
|
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
msleep(10);
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
} while (time_before(jiffies, wait_switch));
|
||
|
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
|
||
|
if (rsp_rc != 0) {
|
||
|
sdev_printk(KERN_ERR, cmd->device,
|
||
|
"failed to send abort() event. rc=%d\n", rsp_rc);
|
||
|
return FAILED;
|
||
|
}
|
||
|
|
||
|
sdev_printk(KERN_INFO, cmd->device,
|
||
|
"aborting command. lun 0x%llx, tag 0x%llx\n",
|
||
|
(((u64) lun) << 48), (u64) found_evt);
|
||
|
|
||
|
wait_for_completion(&evt->comp);
|
||
|
|
||
|
/* make sure we got a good response */
|
||
|
if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
|
||
|
if (printk_ratelimit())
|
||
|
sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
|
||
|
srp_rsp.srp.rsp.opcode);
|
||
|
return FAILED;
|
||
|
}
|
||
|
|
||
|
if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
|
||
|
rsp_rc = *((int *)srp_rsp.srp.rsp.data);
|
||
|
else
|
||
|
rsp_rc = srp_rsp.srp.rsp.status;
|
||
|
|
||
|
if (rsp_rc) {
|
||
|
if (printk_ratelimit())
|
||
|
sdev_printk(KERN_WARNING, cmd->device,
|
||
|
"abort code %d for task tag 0x%llx\n",
|
||
|
rsp_rc, tsk_mgmt->task_tag);
|
||
|
return FAILED;
|
||
|
}
|
||
|
|
||
|
/* Because we dropped the spinlock above, it's possible
|
||
|
* The event is no longer in our list. Make sure it didn't
|
||
|
* complete while we were aborting
|
||
|
*/
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
found_evt = NULL;
|
||
|
list_for_each_entry(tmp_evt, &hostdata->sent, list) {
|
||
|
if (tmp_evt->cmnd == cmd) {
|
||
|
found_evt = tmp_evt;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (found_evt == NULL) {
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
|
||
|
tsk_mgmt->task_tag);
|
||
|
return SUCCESS;
|
||
|
}
|
||
|
|
||
|
sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
|
||
|
tsk_mgmt->task_tag);
|
||
|
|
||
|
cmd->result = (DID_ABORT << 16);
|
||
|
list_del(&found_evt->list);
|
||
|
unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
|
||
|
found_evt->hostdata->dev);
|
||
|
free_event_struct(&found_evt->hostdata->pool, found_evt);
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
atomic_inc(&hostdata->request_limit);
|
||
|
return SUCCESS;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
|
||
|
* template send this over to the server and wait synchronously for the
|
||
|
* response
|
||
|
*/
|
||
|
static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
|
||
|
{
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
|
||
|
struct srp_tsk_mgmt *tsk_mgmt;
|
||
|
struct srp_event_struct *evt;
|
||
|
struct srp_event_struct *tmp_evt, *pos;
|
||
|
union viosrp_iu srp_rsp;
|
||
|
int rsp_rc;
|
||
|
unsigned long flags;
|
||
|
u16 lun = lun_from_dev(cmd->device);
|
||
|
unsigned long wait_switch = 0;
|
||
|
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
wait_switch = jiffies + (init_timeout * HZ);
|
||
|
do {
|
||
|
evt = get_event_struct(&hostdata->pool);
|
||
|
if (evt == NULL) {
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
sdev_printk(KERN_ERR, cmd->device,
|
||
|
"failed to allocate reset event\n");
|
||
|
return FAILED;
|
||
|
}
|
||
|
|
||
|
init_event_struct(evt,
|
||
|
sync_completion,
|
||
|
VIOSRP_SRP_FORMAT,
|
||
|
reset_timeout);
|
||
|
|
||
|
tsk_mgmt = &evt->iu.srp.tsk_mgmt;
|
||
|
|
||
|
/* Set up a lun reset SRP command */
|
||
|
memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
|
||
|
tsk_mgmt->opcode = SRP_TSK_MGMT;
|
||
|
int_to_scsilun(lun, &tsk_mgmt->lun);
|
||
|
tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
|
||
|
|
||
|
evt->sync_srp = &srp_rsp;
|
||
|
|
||
|
init_completion(&evt->comp);
|
||
|
rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
|
||
|
|
||
|
if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
|
||
|
break;
|
||
|
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
msleep(10);
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
} while (time_before(jiffies, wait_switch));
|
||
|
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
|
||
|
if (rsp_rc != 0) {
|
||
|
sdev_printk(KERN_ERR, cmd->device,
|
||
|
"failed to send reset event. rc=%d\n", rsp_rc);
|
||
|
return FAILED;
|
||
|
}
|
||
|
|
||
|
sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
|
||
|
(((u64) lun) << 48));
|
||
|
|
||
|
wait_for_completion(&evt->comp);
|
||
|
|
||
|
/* make sure we got a good response */
|
||
|
if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
|
||
|
if (printk_ratelimit())
|
||
|
sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
|
||
|
srp_rsp.srp.rsp.opcode);
|
||
|
return FAILED;
|
||
|
}
|
||
|
|
||
|
if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
|
||
|
rsp_rc = *((int *)srp_rsp.srp.rsp.data);
|
||
|
else
|
||
|
rsp_rc = srp_rsp.srp.rsp.status;
|
||
|
|
||
|
if (rsp_rc) {
|
||
|
if (printk_ratelimit())
|
||
|
sdev_printk(KERN_WARNING, cmd->device,
|
||
|
"reset code %d for task tag 0x%llx\n",
|
||
|
rsp_rc, tsk_mgmt->task_tag);
|
||
|
return FAILED;
|
||
|
}
|
||
|
|
||
|
/* We need to find all commands for this LUN that have not yet been
|
||
|
* responded to, and fail them with DID_RESET
|
||
|
*/
|
||
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
||
|
list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
|
||
|
if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
|
||
|
if (tmp_evt->cmnd)
|
||
|
tmp_evt->cmnd->result = (DID_RESET << 16);
|
||
|
list_del(&tmp_evt->list);
|
||
|
unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
|
||
|
tmp_evt->hostdata->dev);
|
||
|
free_event_struct(&tmp_evt->hostdata->pool,
|
||
|
tmp_evt);
|
||
|
atomic_inc(&hostdata->request_limit);
|
||
|
if (tmp_evt->cmnd_done)
|
||
|
tmp_evt->cmnd_done(tmp_evt->cmnd);
|
||
|
else if (tmp_evt->done)
|
||
|
tmp_evt->done(tmp_evt);
|
||
|
}
|
||
|
}
|
||
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
||
|
return SUCCESS;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ibmvscsi_eh_host_reset_handler - Reset the connection to the server
|
||
|
* @cmd: struct scsi_cmnd having problems
|
||
|
*/
|
||
|
static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
|
||
|
{
|
||
|
unsigned long wait_switch = 0;
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
|
||
|
|
||
|
dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
|
||
|
|
||
|
ibmvscsi_reset_host(hostdata);
|
||
|
|
||
|
for (wait_switch = jiffies + (init_timeout * HZ);
|
||
|
time_before(jiffies, wait_switch) &&
|
||
|
atomic_read(&hostdata->request_limit) < 2;) {
|
||
|
|
||
|
msleep(10);
|
||
|
}
|
||
|
|
||
|
if (atomic_read(&hostdata->request_limit) <= 0)
|
||
|
return FAILED;
|
||
|
|
||
|
return SUCCESS;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
|
||
|
* @crq: Command/Response queue
|
||
|
* @hostdata: ibmvscsi_host_data of host
|
||
|
*
|
||
|
*/
|
||
|
static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
|
||
|
struct ibmvscsi_host_data *hostdata)
|
||
|
{
|
||
|
long rc;
|
||
|
unsigned long flags;
|
||
|
/* The hypervisor copies our tag value here so no byteswapping */
|
||
|
struct srp_event_struct *evt_struct =
|
||
|
(__force struct srp_event_struct *)crq->IU_data_ptr;
|
||
|
switch (crq->valid) {
|
||
|
case VIOSRP_CRQ_INIT_RSP: /* initialization */
|
||
|
switch (crq->format) {
|
||
|
case VIOSRP_CRQ_INIT: /* Initialization message */
|
||
|
dev_info(hostdata->dev, "partner initialized\n");
|
||
|
/* Send back a response */
|
||
|
rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
|
||
|
if (rc == 0) {
|
||
|
/* Now login */
|
||
|
init_adapter(hostdata);
|
||
|
} else {
|
||
|
dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
|
||
|
}
|
||
|
|
||
|
break;
|
||
|
case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */
|
||
|
dev_info(hostdata->dev, "partner initialization complete\n");
|
||
|
|
||
|
/* Now login */
|
||
|
init_adapter(hostdata);
|
||
|
break;
|
||
|
default:
|
||
|
dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
|
||
|
}
|
||
|
return;
|
||
|
case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */
|
||
|
scsi_block_requests(hostdata->host);
|
||
|
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 VIOSRP_CRQ_CMD_RSP: /* real payload */
|
||
|
break;
|
||
|
default:
|
||
|
dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
|
||
|
crq->valid);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/* The only kind of payload CRQs we should get are responses to
|
||
|
* things we send. Make sure this response is to something we
|
||
|
* actually sent
|
||
|
*/
|
||
|
if (!valid_event_struct(&hostdata->pool, evt_struct)) {
|
||
|
dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
|
||
|
evt_struct);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (atomic_read(&evt_struct->free)) {
|
||
|
dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
|
||
|
evt_struct);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (crq->format == VIOSRP_SRP_FORMAT)
|
||
|
atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),
|
||
|
&hostdata->request_limit);
|
||
|
|
||
|
del_timer(&evt_struct->timer);
|
||
|
|
||
|
if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
|
||
|
evt_struct->cmnd->result = DID_ERROR << 16;
|
||
|
if (evt_struct->done)
|
||
|
evt_struct->done(evt_struct);
|
||
|
else
|
||
|
dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
|
||
|
|
||
|
/*
|
||
|
* Lock the host_lock before messing with these structures, since we
|
||
|
* are running in a task context
|
||
|
*/
|
||
|
spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
|
||
|
list_del(&evt_struct->list);
|
||
|
free_event_struct(&evt_struct->hostdata->pool, evt_struct);
|
||
|
spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
|
||
|
* @sdev: struct scsi_device device to configure
|
||
|
*
|
||
|
* Enable allow_restart for a device if it is a disk. Adjust the
|
||
|
* queue_depth here also as is required by the documentation for
|
||
|
* struct scsi_host_template.
|
||
|
*/
|
||
|
static int ibmvscsi_slave_configure(struct scsi_device *sdev)
|
||
|
{
|
||
|
struct Scsi_Host *shost = sdev->host;
|
||
|
unsigned long lock_flags = 0;
|
||
|
|
||
|
spin_lock_irqsave(shost->host_lock, lock_flags);
|
||
|
if (sdev->type == TYPE_DISK) {
|
||
|
sdev->allow_restart = 1;
|
||
|
blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
|
||
|
}
|
||
|
spin_unlock_irqrestore(shost->host_lock, lock_flags);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ibmvscsi_change_queue_depth - Change the device's queue depth
|
||
|
* @sdev: scsi device struct
|
||
|
* @qdepth: depth to set
|
||
|
* @reason: calling context
|
||
|
*
|
||
|
* Return value:
|
||
|
* actual depth set
|
||
|
**/
|
||
|
static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
|
||
|
{
|
||
|
if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
|
||
|
qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
|
||
|
return scsi_change_queue_depth(sdev, qdepth);
|
||
|
}
|
||
|
|
||
|
/* ------------------------------------------------------------
|
||
|
* sysfs attributes
|
||
|
*/
|
||
|
static ssize_t show_host_vhost_loc(struct device *dev,
|
||
|
struct device_attribute *attr, char *buf)
|
||
|
{
|
||
|
struct Scsi_Host *shost = class_to_shost(dev);
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(shost);
|
||
|
int len;
|
||
|
|
||
|
len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
|
||
|
hostdata->caps.loc);
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static struct device_attribute ibmvscsi_host_vhost_loc = {
|
||
|
.attr = {
|
||
|
.name = "vhost_loc",
|
||
|
.mode = S_IRUGO,
|
||
|
},
|
||
|
.show = show_host_vhost_loc,
|
||
|
};
|
||
|
|
||
|
static ssize_t show_host_vhost_name(struct device *dev,
|
||
|
struct device_attribute *attr, char *buf)
|
||
|
{
|
||
|
struct Scsi_Host *shost = class_to_shost(dev);
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(shost);
|
||
|
int len;
|
||
|
|
||
|
len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
|
||
|
hostdata->caps.name);
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static struct device_attribute ibmvscsi_host_vhost_name = {
|
||
|
.attr = {
|
||
|
.name = "vhost_name",
|
||
|
.mode = S_IRUGO,
|
||
|
},
|
||
|
.show = show_host_vhost_name,
|
||
|
};
|
||
|
|
||
|
static ssize_t show_host_srp_version(struct device *dev,
|
||
|
struct device_attribute *attr, char *buf)
|
||
|
{
|
||
|
struct Scsi_Host *shost = class_to_shost(dev);
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(shost);
|
||
|
int len;
|
||
|
|
||
|
len = snprintf(buf, PAGE_SIZE, "%s\n",
|
||
|
hostdata->madapter_info.srp_version);
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static struct device_attribute ibmvscsi_host_srp_version = {
|
||
|
.attr = {
|
||
|
.name = "srp_version",
|
||
|
.mode = S_IRUGO,
|
||
|
},
|
||
|
.show = show_host_srp_version,
|
||
|
};
|
||
|
|
||
|
static ssize_t show_host_partition_name(struct device *dev,
|
||
|
struct device_attribute *attr,
|
||
|
char *buf)
|
||
|
{
|
||
|
struct Scsi_Host *shost = class_to_shost(dev);
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(shost);
|
||
|
int len;
|
||
|
|
||
|
len = snprintf(buf, PAGE_SIZE, "%s\n",
|
||
|
hostdata->madapter_info.partition_name);
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static struct device_attribute ibmvscsi_host_partition_name = {
|
||
|
.attr = {
|
||
|
.name = "partition_name",
|
||
|
.mode = S_IRUGO,
|
||
|
},
|
||
|
.show = show_host_partition_name,
|
||
|
};
|
||
|
|
||
|
static ssize_t show_host_partition_number(struct device *dev,
|
||
|
struct device_attribute *attr,
|
||
|
char *buf)
|
||
|
{
|
||
|
struct Scsi_Host *shost = class_to_shost(dev);
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(shost);
|
||
|
int len;
|
||
|
|
||
|
len = snprintf(buf, PAGE_SIZE, "%d\n",
|
||
|
be32_to_cpu(hostdata->madapter_info.partition_number));
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static struct device_attribute ibmvscsi_host_partition_number = {
|
||
|
.attr = {
|
||
|
.name = "partition_number",
|
||
|
.mode = S_IRUGO,
|
||
|
},
|
||
|
.show = show_host_partition_number,
|
||
|
};
|
||
|
|
||
|
static ssize_t show_host_mad_version(struct device *dev,
|
||
|
struct device_attribute *attr, char *buf)
|
||
|
{
|
||
|
struct Scsi_Host *shost = class_to_shost(dev);
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(shost);
|
||
|
int len;
|
||
|
|
||
|
len = snprintf(buf, PAGE_SIZE, "%d\n",
|
||
|
be32_to_cpu(hostdata->madapter_info.mad_version));
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static struct device_attribute ibmvscsi_host_mad_version = {
|
||
|
.attr = {
|
||
|
.name = "mad_version",
|
||
|
.mode = S_IRUGO,
|
||
|
},
|
||
|
.show = show_host_mad_version,
|
||
|
};
|
||
|
|
||
|
static ssize_t show_host_os_type(struct device *dev,
|
||
|
struct device_attribute *attr, char *buf)
|
||
|
{
|
||
|
struct Scsi_Host *shost = class_to_shost(dev);
|
||
|
struct ibmvscsi_host_data *hostdata = shost_priv(shost);
|
||
|
int len;
|
||
|
|
||
|
len = snprintf(buf, PAGE_SIZE, "%d\n",
|
||
|
be32_to_cpu(hostdata->madapter_info.os_type));
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static struct device_attribute ibmvscsi_host_os_type = {
|
||
|
.attr = {
|
||
|
.name = "os_type",
|
||
|
.mode = S_IRUGO,
|
||
|
},
|
||
|
.show = show_host_os_type,
|
||
|
};
|
||
|
|
||
|
static ssize_t show_host_config(struct device *dev,
|
||
|
struct device_attribute *attr, char *buf)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct device_attribute ibmvscsi_host_config = {
|
||
|
.attr = {
|
||
|
.name = "config",
|
||
|
.mode = S_IRUGO,
|
||
|
},
|
||
|
.show = show_host_config,
|
||
|
};
|
||
|
|
||
|
static 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, MIN_NICE);
|
||
|
|
||
|
while (1) {
|
||
|
rc = wait_event_interruptible(hostdata->work_wait_q,
|
||
|
ibmvscsi_work_to_do(hostdata));
|
||
|
|
||
|
BUG_ON(rc);
|
||
|
|
||
|
if (kthread_should_stop())
|
||
|
break;
|
||
|
|
||
|
ibmvscsi_do_work(hostdata);
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Called by bus code for each adapter
|
||
|
*/
|
||
|
static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
|
||
|
{
|
||
|
struct ibmvscsi_host_data *hostdata;
|
||
|
struct Scsi_Host *host;
|
||
|
struct device *dev = &vdev->dev;
|
||
|
struct srp_rport_identifiers ids;
|
||
|
struct srp_rport *rport;
|
||
|
unsigned long wait_switch = 0;
|
||
|
int rc;
|
||
|
|
||
|
dev_set_drvdata(&vdev->dev, NULL);
|
||
|
|
||
|
host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
|
||
|
if (!host) {
|
||
|
dev_err(&vdev->dev, "couldn't allocate host data\n");
|
||
|
goto scsi_host_alloc_failed;
|
||
|
}
|
||
|
|
||
|
host->transportt = ibmvscsi_transport_template;
|
||
|
hostdata = shost_priv(host);
|
||
|
memset(hostdata, 0x00, sizeof(*hostdata));
|
||
|
INIT_LIST_HEAD(&hostdata->sent);
|
||
|
init_waitqueue_head(&hostdata->work_wait_q);
|
||
|
hostdata->host = host;
|
||
|
hostdata->dev = dev;
|
||
|
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 = IBMVSCSI_MAX_LUN;
|
||
|
host->max_id = max_id;
|
||
|
host->max_channel = max_channel;
|
||
|
host->max_cmd_len = 16;
|
||
|
|
||
|
dev_info(dev,
|
||
|
"Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",
|
||
|
host->max_id, host->max_lun, host->max_channel);
|
||
|
|
||
|
if (scsi_add_host(hostdata->host, hostdata->dev))
|
||
|
goto add_host_failed;
|
||
|
|
||
|
/* we don't have a proper target_port_id so let's use the fake one */
|
||
|
memcpy(ids.port_id, hostdata->madapter_info.partition_name,
|
||
|
sizeof(ids.port_id));
|
||
|
ids.roles = SRP_RPORT_ROLE_TARGET;
|
||
|
rport = srp_rport_add(host, &ids);
|
||
|
if (IS_ERR(rport))
|
||
|
goto add_srp_port_failed;
|
||
|
|
||
|
/* Try to send an initialization message. Note that this is allowed
|
||
|
* to fail if the other end is not acive. In that case we don't
|
||
|
* want to scan
|
||
|
*/
|
||
|
if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
|
||
|
|| rc == H_RESOURCE) {
|
||
|
/*
|
||
|
* Wait around max init_timeout secs for the adapter to finish
|
||
|
* initializing. When we are done initializing, we will have a
|
||
|
* valid request_limit. We don't want Linux scanning before
|
||
|
* we are ready.
|
||
|
*/
|
||
|
for (wait_switch = jiffies + (init_timeout * HZ);
|
||
|
time_before(jiffies, wait_switch) &&
|
||
|
atomic_read(&hostdata->request_limit) < 2;) {
|
||
|
|
||
|
msleep(10);
|
||
|
}
|
||
|
|
||
|
/* if we now have a valid request_limit, initiate a scan */
|
||
|
if (atomic_read(&hostdata->request_limit) > 0)
|
||
|
scsi_scan_host(host);
|
||
|
}
|
||
|
|
||
|
dev_set_drvdata(&vdev->dev, hostdata);
|
||
|
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[] = {
|
||
|
{"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);
|