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    SubjectRe: [PATCH 3/3] Import fw-sbp2 driver.
    Kristian Høgsberg wrote:
    > Pull in the fw-sbp2 driver for firewire storage devices.
    >
    > Signed-off-by: Kristian Høgsberg <krh@redhat.com>
    > ---
    >
    > drivers/fw/fw-ohci.c | 2
    > drivers/fw/fw-sbp2.c | 1083 ++++++++++++++++++++++++++++++++++++++++++++++++++
    > 2 files changed, 1084 insertions(+), 1 deletions(-)
    >
    > diff --git a/drivers/fw/fw-ohci.c b/drivers/fw/fw-ohci.c
    > index 78e0324..444e8f0 100644
    > --- a/drivers/fw/fw-ohci.c
    > +++ b/drivers/fw/fw-ohci.c
    > @@ -594,7 +594,7 @@ static void bus_reset_tasklet(unsigned l
    > self_id_count, ohci->self_id_buffer);
    > }
    >
    > -static irqreturn_t irq_handler(int irq, void *data, struct pt_regs *unused)
    > +static irqreturn_t irq_handler(int irq, void *data)
    > {
    > struct fw_ohci *ohci = data;
    > u32 event, iso_event;
    > diff --git a/drivers/fw/fw-sbp2.c b/drivers/fw/fw-sbp2.c
    > new file mode 100644
    > index 0000000..e0e7590
    > --- /dev/null
    > +++ b/drivers/fw/fw-sbp2.c
    > @@ -0,0 +1,1083 @@
    > +/* -*- c-basic-offset: 8 -*-
    > + * fw-sbp2.c -- SBP2 driver (SCSI over IEEE1394)
    > + *
    > + * Copyright © 2005 Kristian Høgsberg <krh@bitplanet.net>
    > + *
    > + * This program is free software; you can redistribute it and/or modify
    > + * it under the terms of the GNU General Public License as published by
    > + * the Free Software Foundation; either version 2 of the License, or
    > + * (at your option) any later version.
    > + *
    > + * This program is distributed in the hope that it will be useful,
    > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    > + * GNU General Public License for more details.
    > + *
    > + * You should have received a copy of the GNU General Public License
    > + * along with this program; if not, write to the Free Software Foundation,
    > + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    > + */
    > +
    > +#include <linux/kernel.h>
    > +#include <linux/module.h>
    > +#include <linux/device.h>
    > +#include <linux/dma-mapping.h>
    > +
    > +#include <scsi/scsi.h>
    > +#include <scsi/scsi_cmnd.h>
    > +#include <scsi/scsi_dbg.h>
    > +#include <scsi/scsi_device.h>
    > +#include <scsi/scsi_host.h>
    > +
    > +#include "fw-transaction.h"
    > +#include "fw-topology.h"
    > +#include "fw-device.h"
    > +
    > +/* I don't know why the SCSI stack doesn't define something like this... */
    > +typedef void (*scsi_done_fn_t) (struct scsi_cmnd *);

    submit a patch?


    > +static const char sbp2_driver_name[] = "sbp2";
    > +
    > +struct sbp2_device {
    > + struct fw_address_handler address_handler;
    > + struct list_head orb_list;
    > + u64 management_agent_address;
    > + u64 command_block_agent_address;
    > + u32 workarounds;
    > + int login_id;
    > +
    > + /* We cache these addresses and only update them once we've
    > + * logged in or reconnected to the sbp2 device. That way, any
    > + * IO to the device will automatically fail and get retried if
    > + * it happens in a window where the device is not ready to
    > + * handle it (e.g. after a bus reset but before we reconnect). */
    > + int node_id;
    > + int address_high;
    > + int generation;
    > +
    > + struct work_struct work;
    > + struct Scsi_Host *scsi_host;
    > +};
    > +
    > +#define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
    > +#define SBP2_MAX_SECTORS 255 /* Max sectors supported */
    > +#define SBP2_MAX_CMDS 8 /* This should be safe */
    > +
    > +#define SBP2_ORB_NULL 0x80000000
    > +
    > +#define SBP2_DIRECTION_TO_MEDIA 0x0
    > +#define SBP2_DIRECTION_FROM_MEDIA 0x1
    > +
    > +/* Unit directory keys */
    > +#define SBP2_COMMAND_SET_SPECIFIER 0x38
    > +#define SBP2_COMMAND_SET 0x39
    > +#define SBP2_COMMAND_SET_REVISION 0x3b
    > +#define SBP2_FIRMWARE_REVISION 0x3c
    > +
    > +/* Flags for detected oddities and brokeness */
    > +#define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
    > +#define SBP2_WORKAROUND_INQUIRY_36 0x2
    > +#define SBP2_WORKAROUND_MODE_SENSE_8 0x4
    > +#define SBP2_WORKAROUND_FIX_CAPACITY 0x8
    > +#define SBP2_WORKAROUND_OVERRIDE 0x100
    > +
    > +/* Management orb opcodes */
    > +#define SBP2_LOGIN_REQUEST 0x0
    > +#define SBP2_QUERY_LOGINS_REQUEST 0x1
    > +#define SBP2_RECONNECT_REQUEST 0x3
    > +#define SBP2_SET_PASSWORD_REQUEST 0x4
    > +#define SBP2_LOGOUT_REQUEST 0x7
    > +#define SBP2_ABORT_TASK_REQUEST 0xb
    > +#define SBP2_ABORT_TASK_SET 0xc
    > +#define SBP2_LOGICAL_UNIT_RESET 0xe
    > +#define SBP2_TARGET_RESET_REQUEST 0xf
    > +
    > +/* Offsets for command block agent registers */
    > +#define SBP2_AGENT_STATE 0x00
    > +#define SBP2_AGENT_RESET 0x04
    > +#define SBP2_ORB_POINTER 0x08
    > +#define SBP2_DOORBELL 0x10
    > +#define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
    > +
    > +/* Status write response codes */
    > +#define SBP2_STATUS_REQUEST_COMPLETE 0x0
    > +#define SBP2_STATUS_TRANSPORT_FAILURE 0x1
    > +#define SBP2_STATUS_ILLEGAL_REQUEST 0x2
    > +#define SBP2_STATUS_VENDOR_DEPENDENT 0x3

    consider enum{} rather than #define


    > +struct sbp2_status {
    > + unsigned int orb_high:16;

    unsigned short? probably generates better code than a bitfield:16


    > + unsigned int sbp_status:8;

    unsigned char?


    > + unsigned int len:3;
    > + unsigned int dead:1;
    > + unsigned int response:2;
    > + unsigned int source:2;
    > + u32 orb_low;
    > + u8 data[24];
    > +};
    > +
    > +struct sbp2_orb {
    > + struct fw_transaction t;
    > + dma_addr_t request_bus;
    > + int rcode;
    > + u32 pointer[2];
    > + void (*callback) (struct sbp2_orb * orb, struct sbp2_status * status);
    > + struct list_head link;
    > +};
    > +
    > +struct sbp2_management_orb {
    > + struct sbp2_orb base;
    > + struct {
    > + u32 password_high;
    > + u32 password_low;
    > + u32 response_high;
    > + u32 response_low;
    > + unsigned int lun:16;

    unsigned short?


    > + unsigned int function:4;
    > + unsigned int reconnect:4;
    > + unsigned int reserved:4;
    > + unsigned int exclusive:1;
    > + unsigned int request_format:2;
    > + unsigned int notify:1;
    > + unsigned int response_length:16;
    > + unsigned int password_length:16;

    unsigned short?


    > + u32 status_fifo_high;
    > + u32 status_fifo_low;
    > + } request;
    > + u32 response[4];
    > + dma_addr_t response_bus;
    > + struct completion done;
    > + struct sbp2_status status;
    > +};
    > +
    > +struct sbp2_login_response {
    > + u16 login_id;
    > + u16 length;
    > + u32 command_block_agent_high;
    > + u32 command_block_agent_low;
    > + u32 reconnect_hold;
    > +};

    __le16 and __le32?


    > +struct sbp2_command_orb {
    > + struct sbp2_orb base;
    > + struct {
    > + u32 next_high;
    > + u32 next_low;
    > + u32 data_descriptor_high;
    > + u32 data_descriptor_low;
    > + u32 data_size:16;
    > + u32 page_size:3;
    > + u32 page_table_present:1;
    > + u32 max_payload:4;
    > + u32 speed:3;
    > + u32 direction:1;
    > + u32 reserved:1;
    > + u32 request_format:2;
    > + u32 notify:1;
    > + u8 command_block[12];

    ditto


    > + } request;
    > + struct scsi_cmnd *cmd;
    > + scsi_done_fn_t done;
    > + struct fw_unit *unit;

    > +static int
    > +sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
    > + int function, int lun, void *response)
    > +{
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct sbp2_device *sd = unit->device.driver_data;
    > + struct sbp2_management_orb *orb;
    > + unsigned long timeout;
    > + int retval = -EIO;
    > +
    > + orb = kzalloc(sizeof *orb, GFP_ATOMIC);
    > + if (orb == NULL)
    > + return -ENOMEM;
    > +
    > + /* The sbp2 device is going to send a block read request to
    > + * read out the request from host memory, so map it for
    > + * dma. */
    > + orb->base.request_bus =
    > + dma_map_single(device->card->device, &orb->request,
    > + sizeof orb->request, DMA_TO_DEVICE);
    > +
    > + orb->response_bus =
    > + dma_map_single(device->card->device, &orb->response,
    > + sizeof orb->response, DMA_FROM_DEVICE);

    check for DMA mapping error


    > + orb->request.response_high = 0;
    > + orb->request.response_low = orb->response_bus;
    > + orb->request.notify = 1;
    > + orb->request.function = function;
    > + orb->request.lun = lun;
    > + orb->request.response_length = sizeof orb->response;
    > + orb->request.status_fifo_high = sd->address_handler.offset >> 32;
    > + orb->request.status_fifo_low = sd->address_handler.offset;
    > +
    > + /* FIXME: Yeah, ok this isn't elegant, we hardwire exclusive
    > + * login and 1 second reconnect time. The reconnect setting
    > + * is probably fine, but the exclusive login should be an
    > + * option. */
    > + if (function == SBP2_LOGIN_REQUEST) {
    > + orb->request.exclusive = 1;
    > + orb->request.reconnect = 0;
    > + }
    > +
    > + fw_memcpy_to_be32(&orb->request, &orb->request, sizeof orb->request);
    > +
    > + init_completion(&orb->done);
    > + orb->base.callback = complete_management_orb;
    > + sbp2_send_orb(&orb->base, unit,
    > + node_id, generation, sd->management_agent_address);
    > +
    > + timeout = wait_for_completion_timeout(&orb->done, 10 * HZ);
    > +
    > + /* FIXME: Handle bus reset race here. */
    > +
    > + if (orb->base.rcode != RCODE_COMPLETE) {
    > + fw_error("management write failed, rcode 0x%02x\n",
    > + orb->base.rcode);
    > + goto out;
    > + }
    > +
    > + if (timeout == 0) {
    > + fw_error("orb reply timed out, rcode=0x%02x\n",
    > + orb->base.rcode);
    > + goto out;
    > + }
    > +
    > + if (orb->status.response != 0 || orb->status.sbp_status != 0) {
    > + fw_error("error status: %d:%d\n",
    > + orb->status.response, orb->status.sbp_status);
    > + goto out;
    > + }
    > +
    > + retval = 0;
    > + out:
    > + dma_unmap_single(device->card->device, orb->base.request_bus,
    > + sizeof orb->request, DMA_TO_DEVICE);
    > + dma_unmap_single(device->card->device, orb->response_bus,
    > + sizeof orb->response, DMA_FROM_DEVICE);
    > +
    > + if (response)
    > + fw_memcpy_from_be32(response,
    > + orb->response, sizeof orb->response);
    > +
    > + kfree(orb);
    > +
    > + return retval;
    > +}
    > +
    > +static void
    > +complete_agent_reset_write(struct fw_card *card, int rcode,
    > + u32 *payload, size_t length, void *data)
    > +{
    > + struct fw_transaction *t = data;
    > +
    > + fw_notify("agent reset write rcode=%d\n", rcode);
    > + kfree(t);
    > +}
    > +
    > +static int sbp2_agent_reset(struct fw_unit *unit)
    > +{
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct sbp2_device *sd = unit->device.driver_data;
    > + struct fw_transaction *t;
    > + static u32 zero;
    > +
    > + t = kzalloc(sizeof *t, GFP_ATOMIC);
    > + if (t == NULL)
    > + return -ENOMEM;
    > +
    > + fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
    > + sd->node_id | LOCAL_BUS, sd->generation, SCODE_400,
    > + sd->command_block_agent_address + SBP2_AGENT_RESET,
    > + &zero, sizeof zero, complete_agent_reset_write, t);
    > +
    > + return 0;
    > +}
    > +
    > +static int add_scsi_devices(struct fw_unit *unit);
    > +static void remove_scsi_devices(struct fw_unit *unit);
    > +
    > +static int sbp2_probe(struct device *dev)
    > +{
    > + struct fw_unit *unit = fw_unit(dev);
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct sbp2_device *sd;
    > + struct fw_csr_iterator ci;
    > + int i, key, value, lun, retval;
    > + int node_id, generation, local_node_id;
    > + struct sbp2_login_response response;
    > + u32 model, firmware_revision;
    > +
    > + sd = kzalloc(sizeof *sd, GFP_KERNEL);
    > + if (sd == NULL)
    > + return -ENOMEM;
    > +
    > + unit->device.driver_data = sd;
    > + INIT_LIST_HEAD(&sd->orb_list);
    > +
    > + sd->address_handler.length = 0x100;
    > + sd->address_handler.address_callback = sbp2_status_write;
    > + sd->address_handler.callback_data = unit;
    > +
    > + if (fw_core_add_address_handler(&sd->address_handler,
    > + &fw_high_memory_region) < 0) {
    > + kfree(sd);
    > + return -EBUSY;
    > + }
    > +
    > + if (fw_device_enable_phys_dma(device) < 0) {
    > + fw_core_remove_address_handler(&sd->address_handler);
    > + kfree(sd);
    > + return -EBUSY;
    > + }
    > +
    > + /* Scan unit directory to get management agent address,
    > + * firmware revison and model. Initialize firmware_revision
    > + * and model to values that wont match anything in our table. */
    > + firmware_revision = 0xff000000;
    > + model = 0xff000000;
    > + fw_csr_iterator_init(&ci, unit->directory);
    > + while (fw_csr_iterator_next(&ci, &key, &value)) {
    > + switch (key) {
    > + case CSR_DEPENDENT_INFO | CSR_OFFSET:
    > + sd->management_agent_address =
    > + 0xfffff0000000ULL + 4 * value;
    > + break;
    > + case SBP2_FIRMWARE_REVISION:
    > + firmware_revision = value;
    > + break;
    > + case CSR_MODEL:
    > + model = value;
    > + break;
    > + }
    > + }
    > +
    > + for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
    > + if (sbp2_workarounds_table[i].firmware_revision !=
    > + (firmware_revision & 0xffffff00))
    > + continue;
    > + if (sbp2_workarounds_table[i].model != model)
    > + continue;
    > + sd->workarounds |= sbp2_workarounds_table[i].workarounds;
    > + break;
    > + }
    > +
    > + if (sd->workarounds)
    > + fw_notify("Workarounds for node %s: 0x%x "
    > + "(firmware_revision 0x%06x, model_id 0x%06x)\n",
    > + unit->device.bus_id,
    > + sd->workarounds, firmware_revision, model);
    > +
    > + /* FIXME: Make this work for multi-lun devices. */
    > + lun = 0;

    doesn't allowing the stack to issue REPORT LUNS take care of this?


    > + generation = device->card->generation;
    > + node_id = device->node->node_id;
    > + local_node_id = device->card->local_node->node_id;
    > +
    > + /* FIXME: We should probably do this from a keventd callback
    > + * and handle retries by rescheduling the work. */
    > + if (sbp2_send_management_orb(unit, node_id, generation,
    > + SBP2_LOGIN_REQUEST, lun, &response) < 0) {
    > + fw_core_remove_address_handler(&sd->address_handler);
    > + kfree(sd);
    > + return -EBUSY;
    > + }
    > +
    > + sd->generation = generation;
    > + sd->node_id = node_id;
    > + sd->address_high = (LOCAL_BUS | local_node_id) << 16;
    > +
    > + /* Get command block agent offset and login id. */
    > + sd->command_block_agent_address =
    > + ((u64) response.command_block_agent_high << 32) |
    > + response.command_block_agent_low;
    > + sd->login_id = response.login_id;
    > +
    > + fw_notify("logged in to sbp2 unit %s\n", unit->device.bus_id);
    > + fw_notify(" - management_agent_address: 0x%012llx\n",
    > + sd->management_agent_address);
    > + fw_notify(" - command_block_agent_address: 0x%012llx\n",
    > + sd->command_block_agent_address);
    > + fw_notify(" - status write address: 0x%012llx\n",
    > + sd->address_handler.offset);
    > +
    > +#if 0
    > + /* FIXME: The linux1394 sbp2 does these last few steps. */
    > + sbp2_set_busy_timeout(scsi_id);
    > +
    > + sbp2_max_speed_and_size(scsi_id);
    > +#endif
    > +
    > + sbp2_agent_reset(unit);
    > +
    > + retval = add_scsi_devices(unit);
    > + if (retval < 0) {
    > + sbp2_send_management_orb(unit, sd->node_id, sd->generation,
    > + SBP2_LOGOUT_REQUEST, sd->login_id,
    > + NULL);
    > + fw_core_remove_address_handler(&sd->address_handler);
    > + kfree(sd);
    > + return retval;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +static int sbp2_remove(struct device *dev)
    > +{
    > + struct fw_unit *unit = fw_unit(dev);
    > + struct sbp2_device *sd = unit->device.driver_data;
    > +
    > + sbp2_send_management_orb(unit, sd->node_id, sd->generation,
    > + SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
    > +
    > + remove_scsi_devices(unit);
    > +
    > + fw_core_remove_address_handler(&sd->address_handler);
    > + kfree(sd);
    > +
    > + fw_notify("removed sbp2 unit %s\n", dev->bus_id);
    > +
    > + return 0;
    > +}
    > +
    > +static void sbp2_reconnect(void *data)
    > +{
    > + struct fw_unit *unit = data;
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct sbp2_device *sd = unit->device.driver_data;
    > + int generation, node_id, local_node_id;
    > +
    > + fw_notify("in sbp2_reconnect, reconnecting to unit %s\n",
    > + unit->device.bus_id);
    > +
    > + generation = device->card->generation;
    > + node_id = device->node->node_id;
    > + local_node_id = device->card->local_node->node_id;
    > +
    > + sbp2_send_management_orb(unit, node_id, generation,
    > + SBP2_RECONNECT_REQUEST, sd->login_id, NULL);
    > +
    > + /* FIXME: handle reconnect failures. */
    > +
    > + sbp2_cancel_orbs(unit);
    > +
    > + sd->generation = generation;
    > + sd->node_id = node_id;
    > + sd->address_high = (LOCAL_BUS | local_node_id) << 16;
    > +}
    > +
    > +static void sbp2_update(struct fw_unit *unit)
    > +{
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct sbp2_device *sd = unit->device.driver_data;
    > +
    > + fw_device_enable_phys_dma(device);
    > +
    > + INIT_WORK(&sd->work, sbp2_reconnect, unit);
    > + schedule_work(&sd->work);
    > +}
    > +
    > +#define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
    > +#define SBP2_SW_VERSION_ENTRY 0x00010483
    > +
    > +static struct fw_device_id sbp2_id_table[] = {
    > + {
    > + .match_flags = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
    > + .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
    > + .version = SBP2_SW_VERSION_ENTRY
    > + },
    > + { }
    > +};
    > +
    > +static struct fw_driver sbp2_driver = {
    > + .driver = {
    > + .owner = THIS_MODULE,
    > + .name = sbp2_driver_name,
    > + .bus = &fw_bus_type,
    > + .probe = sbp2_probe,
    > + .remove = sbp2_remove,
    > + },
    > + .update = sbp2_update,
    > + .id_table = sbp2_id_table,
    > +};
    > +
    > +static unsigned int sbp2_status_to_sense_data(u8 * sbp2_status, u8 * sense_data)
    > +{
    > + sense_data[0] = 0x70;
    > + sense_data[1] = 0x0;
    > + sense_data[2] = sbp2_status[1];
    > + sense_data[3] = sbp2_status[4];
    > + sense_data[4] = sbp2_status[5];
    > + sense_data[5] = sbp2_status[6];
    > + sense_data[6] = sbp2_status[7];
    > + sense_data[7] = 10;
    > + sense_data[8] = sbp2_status[8];
    > + sense_data[9] = sbp2_status[9];
    > + sense_data[10] = sbp2_status[10];
    > + sense_data[11] = sbp2_status[11];
    > + sense_data[12] = sbp2_status[2];
    > + sense_data[13] = sbp2_status[3];
    > + sense_data[14] = sbp2_status[12];
    > + sense_data[15] = sbp2_status[13];
    > +
    > + switch (sbp2_status[0] & 0x3f) {
    > + case SAM_STAT_GOOD:
    > + return DID_OK;
    > +
    > + case SAM_STAT_CHECK_CONDITION:
    > + /* return CHECK_CONDITION << 1 | DID_OK << 16; */
    > + return DID_OK;
    > +
    > + case SAM_STAT_BUSY:
    > + return DID_BUS_BUSY;
    > +
    > + case SAM_STAT_CONDITION_MET:
    > + case SAM_STAT_RESERVATION_CONFLICT:
    > + case SAM_STAT_COMMAND_TERMINATED:
    > + default:
    > + return DID_ERROR;
    > + }
    > +}
    > +
    > +static void
    > +complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
    > +{
    > + struct sbp2_command_orb *orb = (struct sbp2_command_orb *)base_orb;
    > + struct fw_unit *unit = orb->unit;
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct scatterlist *sg;
    > + int result;
    > +
    > + if (status != NULL) {
    > + if (status->dead) {
    > + fw_notify("agent died, issuing agent reset\n");
    > + sbp2_agent_reset(unit);
    > + }
    > +
    > + switch (status->response) {
    > + case SBP2_STATUS_REQUEST_COMPLETE:
    > + result = DID_OK;
    > + break;
    > + case SBP2_STATUS_TRANSPORT_FAILURE:
    > + result = DID_BUS_BUSY;
    > + break;
    > + case SBP2_STATUS_ILLEGAL_REQUEST:
    > + case SBP2_STATUS_VENDOR_DEPENDENT:
    > + default:
    > + result = DID_ERROR;
    > + break;
    > + }
    > +
    > + if (result == DID_OK && status->len > 1)
    > + result = sbp2_status_to_sense_data(status->data,
    > + orb->cmd->sense_buffer);
    > + } else {
    > + /* If the orb completes with status == NULL, something
    > + * went wrong, typically a bus reset happened mid-orb
    > + * or when sending the write (less likely). */
    > + fw_notify("no command orb status, rcode=%d\n",
    > + orb->base.rcode);
    > + result = DID_ERROR;
    > + }
    > +
    > + dma_unmap_single(device->card->device, orb->base.request_bus,
    > + sizeof orb->request, DMA_TO_DEVICE);
    > +
    > + if (orb->cmd->use_sg > 0) {
    > + sg = (struct scatterlist *)orb->cmd->request_buffer;
    > + dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
    > + orb->cmd->sc_data_direction);
    > + }
    > +
    > + if (orb->page_table_bus != 0)
    > + dma_unmap_single(device->card->device, orb->page_table_bus,
    > + sizeof orb->page_table_bus, DMA_TO_DEVICE);
    > +
    > + if (orb->request_buffer_bus != 0)
    > + dma_unmap_single(device->card->device, orb->request_buffer_bus,
    > + sizeof orb->request_buffer_bus,
    > + DMA_FROM_DEVICE);
    > +
    > + orb->cmd->result = result << 16;
    > + orb->done(orb->cmd);
    > +
    > + kfree(orb);
    > +}
    > +
    > +static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
    > +{
    > + struct fw_unit *unit =
    > + (struct fw_unit *)orb->cmd->device->host->hostdata[0];
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct sbp2_device *sd = unit->device.driver_data;
    > + struct scatterlist *sg;
    > + int sg_len, l, i, j, count;
    > + size_t size;
    > + dma_addr_t sg_addr;
    > +
    > + sg = (struct scatterlist *)orb->cmd->request_buffer;
    > + count = dma_map_sg(device->card->device, sg, orb->cmd->use_sg,
    > + orb->cmd->sc_data_direction);
    > +
    > + /* Handle the special case where there is only one element in
    > + * the scatter list by converting it to an immediate block
    > + * request. This is also a workaround for broken devices such
    > + * as the second generation iPod which doesn't support page
    > + * tables. */
    > + if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
    > + orb->request.data_descriptor_high = sd->address_high;
    > + orb->request.data_descriptor_low = sg_dma_address(sg);
    > + orb->request.page_table_present = 0;
    > + orb->request.data_size = sg_dma_len(sg);
    > + return;
    > + }
    > +
    > + /* Convert the scatterlist to an sbp2 page table. If any
    > + * scatterlist entries are too big for sbp2 we split the as we go. */
    > + for (i = 0, j = 0; i < count; i++) {
    > + sg_len = sg_dma_len(sg + i);
    > + sg_addr = sg_dma_address(sg + i);
    > + while (sg_len) {
    > + l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
    > + orb->page_table[j].segment_base_low = sg_addr;
    > + orb->page_table[j].segment_base_high = 0;
    > + orb->page_table[j].length = l;
    > + sg_addr += l;
    > + sg_len -= l;
    > + j++;
    > + }
    > + }
    > +
    > + size = sizeof orb->page_table[0] * j;
    > +
    > + /* The data_descriptor pointer is the one case where we need
    > + * to fill in the node ID part of the address. All other
    > + * pointers assume that the data referenced reside on the
    > + * initiator (i.e. us), but data_descriptor can refer to data
    > + * on other nodes so we need to put our ID in descriptor_high. */
    > +
    > + orb->page_table_bus =
    > + dma_map_single(device->card->device, orb->page_table,
    > + size, DMA_TO_DEVICE);
    > + orb->request.data_descriptor_high = sd->address_high;
    > + orb->request.data_descriptor_low = orb->page_table_bus;
    > + orb->request.page_table_present = 1;
    > + orb->request.data_size = j;
    > +
    > + fw_memcpy_to_be32(orb->page_table, orb->page_table, size);
    > +}
    > +
    > +static void sbp2_command_orb_map_buffer(struct sbp2_command_orb *orb)
    > +{
    > + struct fw_unit *unit =
    > + (struct fw_unit *)orb->cmd->device->host->hostdata[0];
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct sbp2_device *sd = unit->device.driver_data;
    > +
    > + /* As for map_scatterlist, we need to fill in the high bits of
    > + * the data_descriptor pointer. */
    > +
    > + orb->request_buffer_bus =
    > + dma_map_single(device->card->device,
    > + orb->cmd->request_buffer,
    > + orb->cmd->request_bufflen,
    > + orb->cmd->sc_data_direction);
    > + orb->request.data_descriptor_high = sd->address_high;
    > + orb->request.data_descriptor_low = orb->request_buffer_bus;
    > + orb->request.page_table_present = 0;
    > + orb->request.data_size = orb->cmd->request_bufflen;
    > +}
    > +
    > +static void sbp2_send_command_orb(struct scsi_cmnd *cmd, scsi_done_fn_t done)
    > +{
    > + struct fw_unit *unit = (struct fw_unit *)cmd->device->host->hostdata[0];
    > + struct fw_device *device = fw_device(unit->device.parent);
    > + struct sbp2_device *sd = unit->device.driver_data;
    > + struct sbp2_command_orb *orb;
    > +
    > + orb = kzalloc(sizeof *orb, GFP_ATOMIC);
    > + if (orb == NULL) {
    > + fw_notify("failed to alloc orb\n");
    > + cmd->result = DID_NO_CONNECT << 16;
    > + done(cmd);
    > + return;
    > + }
    > +
    > + orb->base.request_bus =
    > + dma_map_single(device->card->device, &orb->request,
    > + sizeof orb->request, DMA_TO_DEVICE);
    > +
    > + orb->unit = unit;
    > + orb->done = done;
    > + orb->cmd = cmd;
    > +
    > + orb->request.next_high = SBP2_ORB_NULL;
    > + orb->request.next_low = 0x0;
    > + /* FIXME: Calculate real payload here. */
    > + orb->request.max_payload = 12; /* 2 ^ (12 + 2) = 4096 */
    > + orb->request.speed = device->node->max_speed;
    > + orb->request.notify = 1;
    > +
    > + if (cmd->sc_data_direction == DMA_FROM_DEVICE)
    > + orb->request.direction = SBP2_DIRECTION_FROM_MEDIA;
    > + else if (cmd->sc_data_direction == DMA_TO_DEVICE)
    > + orb->request.direction = SBP2_DIRECTION_TO_MEDIA;
    > +
    > + if (cmd->use_sg) {
    > + sbp2_command_orb_map_scatterlist(orb);
    > + } else if (cmd->request_bufflen > SBP2_MAX_SG_ELEMENT_LENGTH) {
    > + /* FIXME: Need to split this into a sg list... but
    > + * could we get the scsi or blk layer to do that by
    > + * reporting our max supported block size? */
    > + fw_error("command > 64k\n");
    > + cmd->result = DID_ERROR << 16;
    > + done(cmd);
    > + return;
    > + } else if (cmd->request_bufflen > 0) {
    > + sbp2_command_orb_map_buffer(orb);
    > + }
    > +
    > + fw_memcpy_to_be32(&orb->request, &orb->request, sizeof orb->request);
    > +
    > + memset(orb->request.command_block,
    > + 0, sizeof orb->request.command_block);
    > + memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
    > +
    > + orb->base.callback = complete_command_orb;
    > +
    > + sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation,
    > + sd->command_block_agent_address + SBP2_ORB_POINTER);
    > +}
    > +
    > +/* SCSI stack integration */
    > +
    > +static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
    > +{
    > + if (cmd->cmnd[0] == REQUEST_SENSE) {
    > + fw_notify("request_sense");
    > + memcpy(cmd->request_buffer, cmd->sense_buffer, cmd->request_bufflen);
    > + memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
    > + cmd->result = DID_OK << 16;
    > + done(cmd);
    > + return 0;
    > + }

    this is a broken emulation. this command is specified to not repeatedly
    return the same sense data.


    > + /* Bidirectional commands are not yet implemented, and unknown
    > + * transfer direction not handled. */
    > + if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
    > + fw_error("Cannot handle DMA_BIDIRECTIONAL - rejecting command");
    > + cmd->result = DID_ERROR << 16;
    > + done(cmd);
    > + return 0;
    > + }
    > +
    > + sbp2_send_command_orb(cmd, done);
    > +
    > + return 0;
    > +}
    > +
    > +static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
    > +{
    > + struct fw_unit *unit = (struct fw_unit *)sdev->host->hostdata[0];
    > + struct sbp2_device *sd = unit->device.driver_data;
    > +
    > + if (sdev->type == TYPE_DISK &&
    > + sd->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
    > + sdev->skip_ms_page_8 = 1;
    > + if (sd->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) {
    > + fw_notify("setting fix_capacity for %s\n", unit->device.bus_id);
    > + sdev->fix_capacity = 1;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +/*
    > + * Called by scsi stack when something has really gone wrong. Usually
    > + * called when a command has timed-out for some reason.
    > + */
    > +static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
    > +{
    > + struct fw_unit *unit = (struct fw_unit *)cmd->device->host->hostdata[0];
    > +
    > + fw_notify("sbp2_scsi_abort\n");
    > +
    > + sbp2_cancel_orbs(unit);
    > +
    > + return SUCCESS;
    > +}
    > +
    > +static struct scsi_host_template scsi_driver_template = {
    > + .module = THIS_MODULE,
    > + .name = "SBP-2 IEEE-1394",
    > + .proc_name = (char *)sbp2_driver_name,
    > + .queuecommand = sbp2_scsi_queuecommand,
    > + .slave_configure = sbp2_scsi_slave_configure,
    > + .eh_abort_handler = sbp2_scsi_abort,
    > + .this_id = -1,
    > + .sg_tablesize = SG_ALL,
    > + .use_clustering = ENABLE_CLUSTERING,
    > + .cmd_per_lun = 1, /* SBP2_MAX_CMDS, */
    > + .can_queue = 1, /* SBP2_MAX_CMDS, */
    > + .emulated = 1,
    > +};
    > +
    > +static int add_scsi_devices(struct fw_unit *unit)
    > +{
    > + struct sbp2_device *sd = unit->device.driver_data;
    > + int retval, lun;
    > +
    > + sd->scsi_host = scsi_host_alloc(&scsi_driver_template,
    > + sizeof(unsigned long));
    > + if (sd->scsi_host == NULL) {
    > + fw_error("failed to register scsi host\n");
    > + return -1;
    > + }
    > +
    > + sd->scsi_host->hostdata[0] = (unsigned long)unit;
    > + retval = scsi_add_host(sd->scsi_host, &unit->device);
    > + if (retval < 0) {
    > + fw_error("failed to add scsi host\n");
    > + scsi_host_put(sd->scsi_host);
    > + return retval;
    > + }
    > +
    > + /* FIXME: Loop over luns here. */

    should be no need, let the stack do that for you



    > + lun = 0;
    > + retval = scsi_add_device(sd->scsi_host, 0, 0, lun);
    > + if (retval < 0) {
    > + fw_error("failed to add scsi device\n");
    > + scsi_remove_host(sd->scsi_host);
    > + scsi_host_put(sd->scsi_host);
    > + return retval;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +static void remove_scsi_devices(struct fw_unit *unit)
    > +{
    > + struct sbp2_device *sd = unit->device.driver_data;
    > +
    > + scsi_remove_host(sd->scsi_host);
    > + scsi_host_put(sd->scsi_host);
    > +}
    > +
    > +MODULE_AUTHOR("Kristian Høgsberg <krh@bitplanet.net>");
    > +MODULE_DESCRIPTION("SCSI over IEEE1394");
    > +MODULE_LICENSE("GPL");
    > +MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
    > +
    > +static int __init sbp2_init(void)
    > +{
    > + int retval;
    > +
    > + retval = driver_register(&sbp2_driver.driver);
    > + if (retval) {
    > + fw_error("Failed to load fw-sbp2 driver.\n");
    > + return retval;
    > + }
    > +
    > + fw_notify("Loaded fw-sbp2 driver.\n");
    > +
    > + return 0;
    > +}
    > +
    > +static void __exit sbp2_cleanup(void)
    > +{
    > + driver_unregister(&sbp2_driver.driver);
    > +
    > + fw_notify("Unloaded fw-sbp2 driver.\n");
    > +}
    > +
    > +module_init(sbp2_init);
    > +module_exit(sbp2_cleanup);
    > -
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