diff options
Diffstat (limited to 'drivers/scsi/scsi_transport_spi.c')
| -rw-r--r-- | drivers/scsi/scsi_transport_spi.c | 1653 |
1 files changed, 1653 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c new file mode 100644 index 000000000..efb9c3d90 --- /dev/null +++ b/drivers/scsi/scsi_transport_spi.c @@ -0,0 +1,1653 @@ +/* + * Parallel SCSI (SPI) transport specific attributes exported to sysfs. + * + * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. + * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <linux/ctype.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/workqueue.h> +#include <linux/blkdev.h> +#include <linux/mutex.h> +#include <linux/sysfs.h> +#include <linux/slab.h> +#include <linux/suspend.h> +#include <scsi/scsi.h> +#include "scsi_priv.h" +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_spi.h> + +#define SPI_NUM_ATTRS 14 /* increase this if you add attributes */ +#define SPI_OTHER_ATTRS 1 /* Increase this if you add "always + * on" attributes */ +#define SPI_HOST_ATTRS 1 + +#define SPI_MAX_ECHO_BUFFER_SIZE 4096 + +#define DV_LOOPS 3 +#define DV_TIMEOUT (10*HZ) +#define DV_RETRIES 3 /* should only need at most + * two cc/ua clears */ + +/* Our blacklist flags */ +enum { + SPI_BLIST_NOIUS = (__force blist_flags_t)0x1, +}; + +/* blacklist table, modelled on scsi_devinfo.c */ +static struct { + char *vendor; + char *model; + blist_flags_t flags; +} spi_static_device_list[] __initdata = { + {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS }, + {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS }, + {NULL, NULL, 0} +}; + +/* Private data accessors (keep these out of the header file) */ +#define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress) +#define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex) + +struct spi_internal { + struct scsi_transport_template t; + struct spi_function_template *f; +}; + +#define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t) + +static const int ppr_to_ps[] = { + /* The PPR values 0-6 are reserved, fill them in when + * the committee defines them */ + -1, /* 0x00 */ + -1, /* 0x01 */ + -1, /* 0x02 */ + -1, /* 0x03 */ + -1, /* 0x04 */ + -1, /* 0x05 */ + -1, /* 0x06 */ + 3125, /* 0x07 */ + 6250, /* 0x08 */ + 12500, /* 0x09 */ + 25000, /* 0x0a */ + 30300, /* 0x0b */ + 50000, /* 0x0c */ +}; +/* The PPR values at which you calculate the period in ns by multiplying + * by 4 */ +#define SPI_STATIC_PPR 0x0c + +static int sprint_frac(char *dest, int value, int denom) +{ + int frac = value % denom; + int result = sprintf(dest, "%d", value / denom); + + if (frac == 0) + return result; + dest[result++] = '.'; + + do { + denom /= 10; + sprintf(dest + result, "%d", frac / denom); + result++; + frac %= denom; + } while (frac); + + dest[result++] = '\0'; + return result; +} + +static int spi_execute(struct scsi_device *sdev, const void *cmd, + enum dma_data_direction dir, + void *buffer, unsigned bufflen, + struct scsi_sense_hdr *sshdr) +{ + int i, result; + unsigned char sense[SCSI_SENSE_BUFFERSIZE]; + struct scsi_sense_hdr sshdr_tmp; + + if (!sshdr) + sshdr = &sshdr_tmp; + + for(i = 0; i < DV_RETRIES; i++) { + /* + * The purpose of the RQF_PM flag below is to bypass the + * SDEV_QUIESCE state. + */ + result = scsi_execute(sdev, cmd, dir, buffer, bufflen, sense, + sshdr, DV_TIMEOUT, /* retries */ 1, + REQ_FAILFAST_DEV | + REQ_FAILFAST_TRANSPORT | + REQ_FAILFAST_DRIVER, + RQF_PM, NULL); + if (driver_byte(result) != DRIVER_SENSE || + sshdr->sense_key != UNIT_ATTENTION) + break; + } + return result; +} + +static struct { + enum spi_signal_type value; + char *name; +} signal_types[] = { + { SPI_SIGNAL_UNKNOWN, "unknown" }, + { SPI_SIGNAL_SE, "SE" }, + { SPI_SIGNAL_LVD, "LVD" }, + { SPI_SIGNAL_HVD, "HVD" }, +}; + +static inline const char *spi_signal_to_string(enum spi_signal_type type) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(signal_types); i++) { + if (type == signal_types[i].value) + return signal_types[i].name; + } + return NULL; +} +static inline enum spi_signal_type spi_signal_to_value(const char *name) +{ + int i, len; + + for (i = 0; i < ARRAY_SIZE(signal_types); i++) { + len = strlen(signal_types[i].name); + if (strncmp(name, signal_types[i].name, len) == 0 && + (name[len] == '\n' || name[len] == '\0')) + return signal_types[i].value; + } + return SPI_SIGNAL_UNKNOWN; +} + +static int spi_host_setup(struct transport_container *tc, struct device *dev, + struct device *cdev) +{ + struct Scsi_Host *shost = dev_to_shost(dev); + + spi_signalling(shost) = SPI_SIGNAL_UNKNOWN; + + return 0; +} + +static int spi_host_configure(struct transport_container *tc, + struct device *dev, + struct device *cdev); + +static DECLARE_TRANSPORT_CLASS(spi_host_class, + "spi_host", + spi_host_setup, + NULL, + spi_host_configure); + +static int spi_host_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + + if (!scsi_is_host_device(dev)) + return 0; + + shost = dev_to_shost(dev); + if (!shost->transportt || shost->transportt->host_attrs.ac.class + != &spi_host_class.class) + return 0; + + return &shost->transportt->host_attrs.ac == cont; +} + +static int spi_target_configure(struct transport_container *tc, + struct device *dev, + struct device *cdev); + +static int spi_device_configure(struct transport_container *tc, + struct device *dev, + struct device *cdev) +{ + struct scsi_device *sdev = to_scsi_device(dev); + struct scsi_target *starget = sdev->sdev_target; + blist_flags_t bflags; + + bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8], + &sdev->inquiry[16], + SCSI_DEVINFO_SPI); + + /* Populate the target capability fields with the values + * gleaned from the device inquiry */ + + spi_support_sync(starget) = scsi_device_sync(sdev); + spi_support_wide(starget) = scsi_device_wide(sdev); + spi_support_dt(starget) = scsi_device_dt(sdev); + spi_support_dt_only(starget) = scsi_device_dt_only(sdev); + spi_support_ius(starget) = scsi_device_ius(sdev); + if (bflags & SPI_BLIST_NOIUS) { + dev_info(dev, "Information Units disabled by blacklist\n"); + spi_support_ius(starget) = 0; + } + spi_support_qas(starget) = scsi_device_qas(sdev); + + return 0; +} + +static int spi_setup_transport_attrs(struct transport_container *tc, + struct device *dev, + struct device *cdev) +{ + struct scsi_target *starget = to_scsi_target(dev); + + spi_period(starget) = -1; /* illegal value */ + spi_min_period(starget) = 0; + spi_offset(starget) = 0; /* async */ + spi_max_offset(starget) = 255; + spi_width(starget) = 0; /* narrow */ + spi_max_width(starget) = 1; + spi_iu(starget) = 0; /* no IU */ + spi_max_iu(starget) = 1; + spi_dt(starget) = 0; /* ST */ + spi_qas(starget) = 0; + spi_max_qas(starget) = 1; + spi_wr_flow(starget) = 0; + spi_rd_strm(starget) = 0; + spi_rti(starget) = 0; + spi_pcomp_en(starget) = 0; + spi_hold_mcs(starget) = 0; + spi_dv_pending(starget) = 0; + spi_dv_in_progress(starget) = 0; + spi_initial_dv(starget) = 0; + mutex_init(&spi_dv_mutex(starget)); + + return 0; +} + +#define spi_transport_show_simple(field, format_string) \ + \ +static ssize_t \ +show_spi_transport_##field(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct scsi_target *starget = transport_class_to_starget(dev); \ + struct spi_transport_attrs *tp; \ + \ + tp = (struct spi_transport_attrs *)&starget->starget_data; \ + return snprintf(buf, 20, format_string, tp->field); \ +} + +#define spi_transport_store_simple(field, format_string) \ + \ +static ssize_t \ +store_spi_transport_##field(struct device *dev, \ + struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + int val; \ + struct scsi_target *starget = transport_class_to_starget(dev); \ + struct spi_transport_attrs *tp; \ + \ + tp = (struct spi_transport_attrs *)&starget->starget_data; \ + val = simple_strtoul(buf, NULL, 0); \ + tp->field = val; \ + return count; \ +} + +#define spi_transport_show_function(field, format_string) \ + \ +static ssize_t \ +show_spi_transport_##field(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct scsi_target *starget = transport_class_to_starget(dev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct spi_transport_attrs *tp; \ + struct spi_internal *i = to_spi_internal(shost->transportt); \ + tp = (struct spi_transport_attrs *)&starget->starget_data; \ + if (i->f->get_##field) \ + i->f->get_##field(starget); \ + return snprintf(buf, 20, format_string, tp->field); \ +} + +#define spi_transport_store_function(field, format_string) \ +static ssize_t \ +store_spi_transport_##field(struct device *dev, \ + struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + int val; \ + struct scsi_target *starget = transport_class_to_starget(dev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct spi_internal *i = to_spi_internal(shost->transportt); \ + \ + if (!i->f->set_##field) \ + return -EINVAL; \ + val = simple_strtoul(buf, NULL, 0); \ + i->f->set_##field(starget, val); \ + return count; \ +} + +#define spi_transport_store_max(field, format_string) \ +static ssize_t \ +store_spi_transport_##field(struct device *dev, \ + struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + int val; \ + struct scsi_target *starget = transport_class_to_starget(dev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct spi_internal *i = to_spi_internal(shost->transportt); \ + struct spi_transport_attrs *tp \ + = (struct spi_transport_attrs *)&starget->starget_data; \ + \ + if (!i->f->set_##field) \ + return -EINVAL; \ + val = simple_strtoul(buf, NULL, 0); \ + if (val > tp->max_##field) \ + val = tp->max_##field; \ + i->f->set_##field(starget, val); \ + return count; \ +} + +#define spi_transport_rd_attr(field, format_string) \ + spi_transport_show_function(field, format_string) \ + spi_transport_store_function(field, format_string) \ +static DEVICE_ATTR(field, S_IRUGO, \ + show_spi_transport_##field, \ + store_spi_transport_##field); + +#define spi_transport_simple_attr(field, format_string) \ + spi_transport_show_simple(field, format_string) \ + spi_transport_store_simple(field, format_string) \ +static DEVICE_ATTR(field, S_IRUGO, \ + show_spi_transport_##field, \ + store_spi_transport_##field); + +#define spi_transport_max_attr(field, format_string) \ + spi_transport_show_function(field, format_string) \ + spi_transport_store_max(field, format_string) \ + spi_transport_simple_attr(max_##field, format_string) \ +static DEVICE_ATTR(field, S_IRUGO, \ + show_spi_transport_##field, \ + store_spi_transport_##field); + +/* The Parallel SCSI Tranport Attributes: */ +spi_transport_max_attr(offset, "%d\n"); +spi_transport_max_attr(width, "%d\n"); +spi_transport_max_attr(iu, "%d\n"); +spi_transport_rd_attr(dt, "%d\n"); +spi_transport_max_attr(qas, "%d\n"); +spi_transport_rd_attr(wr_flow, "%d\n"); +spi_transport_rd_attr(rd_strm, "%d\n"); +spi_transport_rd_attr(rti, "%d\n"); +spi_transport_rd_attr(pcomp_en, "%d\n"); +spi_transport_rd_attr(hold_mcs, "%d\n"); + +/* we only care about the first child device that's a real SCSI device + * so we return 1 to terminate the iteration when we find it */ +static int child_iter(struct device *dev, void *data) +{ + if (!scsi_is_sdev_device(dev)) + return 0; + + spi_dv_device(to_scsi_device(dev)); + return 1; +} + +static ssize_t +store_spi_revalidate(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_target *starget = transport_class_to_starget(dev); + + device_for_each_child(&starget->dev, NULL, child_iter); + return count; +} +static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate); + +/* Translate the period into ns according to the current spec + * for SDTR/PPR messages */ +static int period_to_str(char *buf, int period) +{ + int len, picosec; + + if (period < 0 || period > 0xff) { + picosec = -1; + } else if (period <= SPI_STATIC_PPR) { + picosec = ppr_to_ps[period]; + } else { + picosec = period * 4000; + } + + if (picosec == -1) { + len = sprintf(buf, "reserved"); + } else { + len = sprint_frac(buf, picosec, 1000); + } + + return len; +} + +static ssize_t +show_spi_transport_period_helper(char *buf, int period) +{ + int len = period_to_str(buf, period); + buf[len++] = '\n'; + buf[len] = '\0'; + return len; +} + +static ssize_t +store_spi_transport_period_helper(struct device *dev, const char *buf, + size_t count, int *periodp) +{ + int j, picosec, period = -1; + char *endp; + + picosec = simple_strtoul(buf, &endp, 10) * 1000; + if (*endp == '.') { + int mult = 100; + do { + endp++; + if (!isdigit(*endp)) + break; + picosec += (*endp - '0') * mult; + mult /= 10; + } while (mult > 0); + } + + for (j = 0; j <= SPI_STATIC_PPR; j++) { + if (ppr_to_ps[j] < picosec) + continue; + period = j; + break; + } + + if (period == -1) + period = picosec / 4000; + + if (period > 0xff) + period = 0xff; + + *periodp = period; + + return count; +} + +static ssize_t +show_spi_transport_period(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct scsi_target *starget = transport_class_to_starget(dev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct spi_internal *i = to_spi_internal(shost->transportt); + struct spi_transport_attrs *tp = + (struct spi_transport_attrs *)&starget->starget_data; + + if (i->f->get_period) + i->f->get_period(starget); + + return show_spi_transport_period_helper(buf, tp->period); +} + +static ssize_t +store_spi_transport_period(struct device *cdev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct spi_internal *i = to_spi_internal(shost->transportt); + struct spi_transport_attrs *tp = + (struct spi_transport_attrs *)&starget->starget_data; + int period, retval; + + if (!i->f->set_period) + return -EINVAL; + + retval = store_spi_transport_period_helper(cdev, buf, count, &period); + + if (period < tp->min_period) + period = tp->min_period; + + i->f->set_period(starget, period); + + return retval; +} + +static DEVICE_ATTR(period, S_IRUGO, + show_spi_transport_period, + store_spi_transport_period); + +static ssize_t +show_spi_transport_min_period(struct device *cdev, + struct device_attribute *attr, char *buf) +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct spi_internal *i = to_spi_internal(shost->transportt); + struct spi_transport_attrs *tp = + (struct spi_transport_attrs *)&starget->starget_data; + + if (!i->f->set_period) + return -EINVAL; + + return show_spi_transport_period_helper(buf, tp->min_period); +} + +static ssize_t +store_spi_transport_min_period(struct device *cdev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + struct spi_transport_attrs *tp = + (struct spi_transport_attrs *)&starget->starget_data; + + return store_spi_transport_period_helper(cdev, buf, count, + &tp->min_period); +} + + +static DEVICE_ATTR(min_period, S_IRUGO, + show_spi_transport_min_period, + store_spi_transport_min_period); + + +static ssize_t show_spi_host_signalling(struct device *cdev, + struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *shost = transport_class_to_shost(cdev); + struct spi_internal *i = to_spi_internal(shost->transportt); + + if (i->f->get_signalling) + i->f->get_signalling(shost); + + return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost))); +} +static ssize_t store_spi_host_signalling(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct Scsi_Host *shost = transport_class_to_shost(dev); + struct spi_internal *i = to_spi_internal(shost->transportt); + enum spi_signal_type type = spi_signal_to_value(buf); + + if (!i->f->set_signalling) + return -EINVAL; + + if (type != SPI_SIGNAL_UNKNOWN) + i->f->set_signalling(shost, type); + + return count; +} +static DEVICE_ATTR(signalling, S_IRUGO, + show_spi_host_signalling, + store_spi_host_signalling); + +static ssize_t show_spi_host_width(struct device *cdev, + struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *shost = transport_class_to_shost(cdev); + + return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow"); +} +static DEVICE_ATTR(host_width, S_IRUGO, + show_spi_host_width, NULL); + +static ssize_t show_spi_host_hba_id(struct device *cdev, + struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *shost = transport_class_to_shost(cdev); + + return sprintf(buf, "%d\n", shost->this_id); +} +static DEVICE_ATTR(hba_id, S_IRUGO, + show_spi_host_hba_id, NULL); + +#define DV_SET(x, y) \ + if(i->f->set_##x) \ + i->f->set_##x(sdev->sdev_target, y) + +enum spi_compare_returns { + SPI_COMPARE_SUCCESS, + SPI_COMPARE_FAILURE, + SPI_COMPARE_SKIP_TEST, +}; + + +/* This is for read/write Domain Validation: If the device supports + * an echo buffer, we do read/write tests to it */ +static enum spi_compare_returns +spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer, + u8 *ptr, const int retries) +{ + int len = ptr - buffer; + int j, k, r, result; + unsigned int pattern = 0x0000ffff; + struct scsi_sense_hdr sshdr; + + const char spi_write_buffer[] = { + WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 + }; + const char spi_read_buffer[] = { + READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 + }; + + /* set up the pattern buffer. Doesn't matter if we spill + * slightly beyond since that's where the read buffer is */ + for (j = 0; j < len; ) { + + /* fill the buffer with counting (test a) */ + for ( ; j < min(len, 32); j++) + buffer[j] = j; + k = j; + /* fill the buffer with alternating words of 0x0 and + * 0xffff (test b) */ + for ( ; j < min(len, k + 32); j += 2) { + u16 *word = (u16 *)&buffer[j]; + + *word = (j & 0x02) ? 0x0000 : 0xffff; + } + k = j; + /* fill with crosstalk (alternating 0x5555 0xaaa) + * (test c) */ + for ( ; j < min(len, k + 32); j += 2) { + u16 *word = (u16 *)&buffer[j]; + + *word = (j & 0x02) ? 0x5555 : 0xaaaa; + } + k = j; + /* fill with shifting bits (test d) */ + for ( ; j < min(len, k + 32); j += 4) { + u32 *word = (unsigned int *)&buffer[j]; + u32 roll = (pattern & 0x80000000) ? 1 : 0; + + *word = pattern; + pattern = (pattern << 1) | roll; + } + /* don't bother with random data (test e) */ + } + + for (r = 0; r < retries; r++) { + result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE, + buffer, len, &sshdr); + if(result || !scsi_device_online(sdev)) { + + scsi_device_set_state(sdev, SDEV_QUIESCE); + if (scsi_sense_valid(&sshdr) + && sshdr.sense_key == ILLEGAL_REQUEST + /* INVALID FIELD IN CDB */ + && sshdr.asc == 0x24 && sshdr.ascq == 0x00) + /* This would mean that the drive lied + * to us about supporting an echo + * buffer (unfortunately some Western + * Digital drives do precisely this) + */ + return SPI_COMPARE_SKIP_TEST; + + + sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result); + return SPI_COMPARE_FAILURE; + } + + memset(ptr, 0, len); + spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE, + ptr, len, NULL); + scsi_device_set_state(sdev, SDEV_QUIESCE); + + if (memcmp(buffer, ptr, len) != 0) + return SPI_COMPARE_FAILURE; + } + return SPI_COMPARE_SUCCESS; +} + +/* This is for the simplest form of Domain Validation: a read test + * on the inquiry data from the device */ +static enum spi_compare_returns +spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer, + u8 *ptr, const int retries) +{ + int r, result; + const int len = sdev->inquiry_len; + const char spi_inquiry[] = { + INQUIRY, 0, 0, 0, len, 0 + }; + + for (r = 0; r < retries; r++) { + memset(ptr, 0, len); + + result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE, + ptr, len, NULL); + + if(result || !scsi_device_online(sdev)) { + scsi_device_set_state(sdev, SDEV_QUIESCE); + return SPI_COMPARE_FAILURE; + } + + /* If we don't have the inquiry data already, the + * first read gets it */ + if (ptr == buffer) { + ptr += len; + --r; + continue; + } + + if (memcmp(buffer, ptr, len) != 0) + /* failure */ + return SPI_COMPARE_FAILURE; + } + return SPI_COMPARE_SUCCESS; +} + +static enum spi_compare_returns +spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr, + enum spi_compare_returns + (*compare_fn)(struct scsi_device *, u8 *, u8 *, int)) +{ + struct spi_internal *i = to_spi_internal(sdev->host->transportt); + struct scsi_target *starget = sdev->sdev_target; + int period = 0, prevperiod = 0; + enum spi_compare_returns retval; + + + for (;;) { + int newperiod; + retval = compare_fn(sdev, buffer, ptr, DV_LOOPS); + + if (retval == SPI_COMPARE_SUCCESS + || retval == SPI_COMPARE_SKIP_TEST) + break; + + /* OK, retrain, fallback */ + if (i->f->get_iu) + i->f->get_iu(starget); + if (i->f->get_qas) + i->f->get_qas(starget); + if (i->f->get_period) + i->f->get_period(sdev->sdev_target); + + /* Here's the fallback sequence; first try turning off + * IU, then QAS (if we can control them), then finally + * fall down the periods */ + if (i->f->set_iu && spi_iu(starget)) { + starget_printk(KERN_ERR, starget, "Domain Validation Disabling Information Units\n"); + DV_SET(iu, 0); + } else if (i->f->set_qas && spi_qas(starget)) { + starget_printk(KERN_ERR, starget, "Domain Validation Disabling Quick Arbitration and Selection\n"); + DV_SET(qas, 0); + } else { + newperiod = spi_period(starget); + period = newperiod > period ? newperiod : period; + if (period < 0x0d) + period++; + else + period += period >> 1; + + if (unlikely(period > 0xff || period == prevperiod)) { + /* Total failure; set to async and return */ + starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n"); + DV_SET(offset, 0); + return SPI_COMPARE_FAILURE; + } + starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n"); + DV_SET(period, period); + prevperiod = period; + } + } + return retval; +} + +static int +spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer) +{ + int l, result; + + /* first off do a test unit ready. This can error out + * because of reservations or some other reason. If it + * fails, the device won't let us write to the echo buffer + * so just return failure */ + + static const char spi_test_unit_ready[] = { + TEST_UNIT_READY, 0, 0, 0, 0, 0 + }; + + static const char spi_read_buffer_descriptor[] = { + READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0 + }; + + + /* We send a set of three TURs to clear any outstanding + * unit attention conditions if they exist (Otherwise the + * buffer tests won't be happy). If the TUR still fails + * (reservation conflict, device not ready, etc) just + * skip the write tests */ + for (l = 0; ; l++) { + result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, + NULL, 0, NULL); + + if(result) { + if(l >= 3) + return 0; + } else { + /* TUR succeeded */ + break; + } + } + + result = spi_execute(sdev, spi_read_buffer_descriptor, + DMA_FROM_DEVICE, buffer, 4, NULL); + + if (result) + /* Device has no echo buffer */ + return 0; + + return buffer[3] + ((buffer[2] & 0x1f) << 8); +} + +static void +spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer) +{ + struct spi_internal *i = to_spi_internal(sdev->host->transportt); + struct scsi_target *starget = sdev->sdev_target; + struct Scsi_Host *shost = sdev->host; + int len = sdev->inquiry_len; + int min_period = spi_min_period(starget); + int max_width = spi_max_width(starget); + /* first set us up for narrow async */ + DV_SET(offset, 0); + DV_SET(width, 0); + + if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS) + != SPI_COMPARE_SUCCESS) { + starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n"); + /* FIXME: should probably offline the device here? */ + return; + } + + if (!spi_support_wide(starget)) { + spi_max_width(starget) = 0; + max_width = 0; + } + + /* test width */ + if (i->f->set_width && max_width) { + i->f->set_width(starget, 1); + + if (spi_dv_device_compare_inquiry(sdev, buffer, + buffer + len, + DV_LOOPS) + != SPI_COMPARE_SUCCESS) { + starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n"); + i->f->set_width(starget, 0); + /* Make sure we don't force wide back on by asking + * for a transfer period that requires it */ + max_width = 0; + if (min_period < 10) + min_period = 10; + } + } + + if (!i->f->set_period) + return; + + /* device can't handle synchronous */ + if (!spi_support_sync(starget) && !spi_support_dt(starget)) + return; + + /* len == -1 is the signal that we need to ascertain the + * presence of an echo buffer before trying to use it. len == + * 0 means we don't have an echo buffer */ + len = -1; + + retry: + + /* now set up to the maximum */ + DV_SET(offset, spi_max_offset(starget)); + DV_SET(period, min_period); + + /* try QAS requests; this should be harmless to set if the + * target supports it */ + if (spi_support_qas(starget) && spi_max_qas(starget)) { + DV_SET(qas, 1); + } else { + DV_SET(qas, 0); + } + + if (spi_support_ius(starget) && spi_max_iu(starget) && + min_period < 9) { + /* This u320 (or u640). Set IU transfers */ + DV_SET(iu, 1); + /* Then set the optional parameters */ + DV_SET(rd_strm, 1); + DV_SET(wr_flow, 1); + DV_SET(rti, 1); + if (min_period == 8) + DV_SET(pcomp_en, 1); + } else { + DV_SET(iu, 0); + } + + /* now that we've done all this, actually check the bus + * signal type (if known). Some devices are stupid on + * a SE bus and still claim they can try LVD only settings */ + if (i->f->get_signalling) + i->f->get_signalling(shost); + if (spi_signalling(shost) == SPI_SIGNAL_SE || + spi_signalling(shost) == SPI_SIGNAL_HVD || + !spi_support_dt(starget)) { + DV_SET(dt, 0); + } else { + DV_SET(dt, 1); + } + /* set width last because it will pull all the other + * parameters down to required values */ + DV_SET(width, max_width); + + /* Do the read only INQUIRY tests */ + spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len, + spi_dv_device_compare_inquiry); + /* See if we actually managed to negotiate and sustain DT */ + if (i->f->get_dt) + i->f->get_dt(starget); + + /* see if the device has an echo buffer. If it does we can do + * the SPI pattern write tests. Because of some broken + * devices, we *only* try this on a device that has actually + * negotiated DT */ + + if (len == -1 && spi_dt(starget)) + len = spi_dv_device_get_echo_buffer(sdev, buffer); + + if (len <= 0) { + starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n"); + return; + } + + if (len > SPI_MAX_ECHO_BUFFER_SIZE) { + starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE); + len = SPI_MAX_ECHO_BUFFER_SIZE; + } + + if (spi_dv_retrain(sdev, buffer, buffer + len, + spi_dv_device_echo_buffer) + == SPI_COMPARE_SKIP_TEST) { + /* OK, the stupid drive can't do a write echo buffer + * test after all, fall back to the read tests */ + len = 0; + goto retry; + } +} + + +/** spi_dv_device - Do Domain Validation on the device + * @sdev: scsi device to validate + * + * Performs the domain validation on the given device in the + * current execution thread. Since DV operations may sleep, + * the current thread must have user context. Also no SCSI + * related locks that would deadlock I/O issued by the DV may + * be held. + */ +void +spi_dv_device(struct scsi_device *sdev) +{ + struct scsi_target *starget = sdev->sdev_target; + u8 *buffer; + const int len = SPI_MAX_ECHO_BUFFER_SIZE*2; + + /* + * Because this function and the power management code both call + * scsi_device_quiesce(), it is not safe to perform domain validation + * while suspend or resume is in progress. Hence the + * lock/unlock_system_sleep() calls. + */ + lock_system_sleep(); + + if (scsi_autopm_get_device(sdev)) + goto unlock_system_sleep; + + if (unlikely(spi_dv_in_progress(starget))) + goto put_autopm; + + if (unlikely(scsi_device_get(sdev))) + goto put_autopm; + + spi_dv_in_progress(starget) = 1; + + buffer = kzalloc(len, GFP_KERNEL); + + if (unlikely(!buffer)) + goto put_sdev; + + /* We need to verify that the actual device will quiesce; the + * later target quiesce is just a nice to have */ + if (unlikely(scsi_device_quiesce(sdev))) + goto free_buffer; + + scsi_target_quiesce(starget); + + spi_dv_pending(starget) = 1; + mutex_lock(&spi_dv_mutex(starget)); + + starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n"); + + spi_dv_device_internal(sdev, buffer); + + starget_printk(KERN_INFO, starget, "Ending Domain Validation\n"); + + mutex_unlock(&spi_dv_mutex(starget)); + spi_dv_pending(starget) = 0; + + scsi_target_resume(starget); + + spi_initial_dv(starget) = 1; + +free_buffer: + kfree(buffer); + +put_sdev: + spi_dv_in_progress(starget) = 0; + scsi_device_put(sdev); +put_autopm: + scsi_autopm_put_device(sdev); + +unlock_system_sleep: + unlock_system_sleep(); +} +EXPORT_SYMBOL(spi_dv_device); + +struct work_queue_wrapper { + struct work_struct work; + struct scsi_device *sdev; +}; + +static void +spi_dv_device_work_wrapper(struct work_struct *work) +{ + struct work_queue_wrapper *wqw = + container_of(work, struct work_queue_wrapper, work); + struct scsi_device *sdev = wqw->sdev; + + kfree(wqw); + spi_dv_device(sdev); + spi_dv_pending(sdev->sdev_target) = 0; + scsi_device_put(sdev); +} + + +/** + * spi_schedule_dv_device - schedule domain validation to occur on the device + * @sdev: The device to validate + * + * Identical to spi_dv_device() above, except that the DV will be + * scheduled to occur in a workqueue later. All memory allocations + * are atomic, so may be called from any context including those holding + * SCSI locks. + */ +void +spi_schedule_dv_device(struct scsi_device *sdev) +{ + struct work_queue_wrapper *wqw = + kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); + + if (unlikely(!wqw)) + return; + + if (unlikely(spi_dv_pending(sdev->sdev_target))) { + kfree(wqw); + return; + } + /* Set pending early (dv_device doesn't check it, only sets it) */ + spi_dv_pending(sdev->sdev_target) = 1; + if (unlikely(scsi_device_get(sdev))) { + kfree(wqw); + spi_dv_pending(sdev->sdev_target) = 0; + return; + } + + INIT_WORK(&wqw->work, spi_dv_device_work_wrapper); + wqw->sdev = sdev; + + schedule_work(&wqw->work); +} +EXPORT_SYMBOL(spi_schedule_dv_device); + +/** + * spi_display_xfer_agreement - Print the current target transfer agreement + * @starget: The target for which to display the agreement + * + * Each SPI port is required to maintain a transfer agreement for each + * other port on the bus. This function prints a one-line summary of + * the current agreement; more detailed information is available in sysfs. + */ +void spi_display_xfer_agreement(struct scsi_target *starget) +{ + struct spi_transport_attrs *tp; + tp = (struct spi_transport_attrs *)&starget->starget_data; + + if (tp->offset > 0 && tp->period > 0) { + unsigned int picosec, kb100; + char *scsi = "FAST-?"; + char tmp[8]; + + if (tp->period <= SPI_STATIC_PPR) { + picosec = ppr_to_ps[tp->period]; + switch (tp->period) { + case 7: scsi = "FAST-320"; break; + case 8: scsi = "FAST-160"; break; + case 9: scsi = "FAST-80"; break; + case 10: + case 11: scsi = "FAST-40"; break; + case 12: scsi = "FAST-20"; break; + } + } else { + picosec = tp->period * 4000; + if (tp->period < 25) + scsi = "FAST-20"; + else if (tp->period < 50) + scsi = "FAST-10"; + else + scsi = "FAST-5"; + } + + kb100 = (10000000 + picosec / 2) / picosec; + if (tp->width) + kb100 *= 2; + sprint_frac(tmp, picosec, 1000); + + dev_info(&starget->dev, + "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n", + scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10, + tp->dt ? "DT" : "ST", + tp->iu ? " IU" : "", + tp->qas ? " QAS" : "", + tp->rd_strm ? " RDSTRM" : "", + tp->rti ? " RTI" : "", + tp->wr_flow ? " WRFLOW" : "", + tp->pcomp_en ? " PCOMP" : "", + tp->hold_mcs ? " HMCS" : "", + tmp, tp->offset); + } else { + dev_info(&starget->dev, "%sasynchronous\n", + tp->width ? "wide " : ""); + } +} +EXPORT_SYMBOL(spi_display_xfer_agreement); + +int spi_populate_width_msg(unsigned char *msg, int width) +{ + msg[0] = EXTENDED_MESSAGE; + msg[1] = 2; + msg[2] = EXTENDED_WDTR; + msg[3] = width; + return 4; +} +EXPORT_SYMBOL_GPL(spi_populate_width_msg); + +int spi_populate_sync_msg(unsigned char *msg, int period, int offset) +{ + msg[0] = EXTENDED_MESSAGE; + msg[1] = 3; + msg[2] = EXTENDED_SDTR; + msg[3] = period; + msg[4] = offset; + return 5; +} +EXPORT_SYMBOL_GPL(spi_populate_sync_msg); + +int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, + int width, int options) +{ + msg[0] = EXTENDED_MESSAGE; + msg[1] = 6; + msg[2] = EXTENDED_PPR; + msg[3] = period; + msg[4] = 0; + msg[5] = offset; + msg[6] = width; + msg[7] = options; + return 8; +} +EXPORT_SYMBOL_GPL(spi_populate_ppr_msg); + +/** + * spi_populate_tag_msg - place a tag message in a buffer + * @msg: pointer to the area to place the tag + * @cmd: pointer to the scsi command for the tag + * + * Notes: + * designed to create the correct type of tag message for the + * particular request. Returns the size of the tag message. + * May return 0 if TCQ is disabled for this device. + **/ +int spi_populate_tag_msg(unsigned char *msg, struct scsi_cmnd *cmd) +{ + if (cmd->flags & SCMD_TAGGED) { + *msg++ = SIMPLE_QUEUE_TAG; + *msg++ = cmd->request->tag; + return 2; + } + + return 0; +} +EXPORT_SYMBOL_GPL(spi_populate_tag_msg); + +#ifdef CONFIG_SCSI_CONSTANTS +static const char * const one_byte_msgs[] = { +/* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers", +/* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", +/* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error", +/* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag", +/* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", +/* 0x0f */ "Initiate Recovery", "Release Recovery", +/* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable", +/* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset" +}; + +static const char * const two_byte_msgs[] = { +/* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag", +/* 0x23 */ "Ignore Wide Residue", "ACA" +}; + +static const char * const extended_msgs[] = { +/* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request", +/* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request", +/* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer" +}; + +static void print_nego(const unsigned char *msg, int per, int off, int width) +{ + if (per) { + char buf[20]; + period_to_str(buf, msg[per]); + printk("period = %s ns ", buf); + } + + if (off) + printk("offset = %d ", msg[off]); + if (width) + printk("width = %d ", 8 << msg[width]); +} + +static void print_ptr(const unsigned char *msg, int msb, const char *desc) +{ + int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) | + msg[msb+3]; + printk("%s = %d ", desc, ptr); +} + +int spi_print_msg(const unsigned char *msg) +{ + int len = 1, i; + if (msg[0] == EXTENDED_MESSAGE) { + len = 2 + msg[1]; + if (len == 2) + len += 256; + if (msg[2] < ARRAY_SIZE(extended_msgs)) + printk ("%s ", extended_msgs[msg[2]]); + else + printk ("Extended Message, reserved code (0x%02x) ", + (int) msg[2]); + switch (msg[2]) { + case EXTENDED_MODIFY_DATA_POINTER: + print_ptr(msg, 3, "pointer"); + break; + case EXTENDED_SDTR: + print_nego(msg, 3, 4, 0); + break; + case EXTENDED_WDTR: + print_nego(msg, 0, 0, 3); + break; + case EXTENDED_PPR: + print_nego(msg, 3, 5, 6); + break; + case EXTENDED_MODIFY_BIDI_DATA_PTR: + print_ptr(msg, 3, "out"); + print_ptr(msg, 7, "in"); + break; + default: + for (i = 2; i < len; ++i) + printk("%02x ", msg[i]); + } + /* Identify */ + } else if (msg[0] & 0x80) { + printk("Identify disconnect %sallowed %s %d ", + (msg[0] & 0x40) ? "" : "not ", + (msg[0] & 0x20) ? "target routine" : "lun", + msg[0] & 0x7); + /* Normal One byte */ + } else if (msg[0] < 0x1f) { + if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]]) + printk("%s ", one_byte_msgs[msg[0]]); + else + printk("reserved (%02x) ", msg[0]); + } else if (msg[0] == 0x55) { + printk("QAS Request "); + /* Two byte */ + } else if (msg[0] <= 0x2f) { + if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs)) + printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], + msg[1]); + else + printk("reserved two byte (%02x %02x) ", + msg[0], msg[1]); + len = 2; + } else + printk("reserved "); + return len; +} +EXPORT_SYMBOL(spi_print_msg); + +#else /* ifndef CONFIG_SCSI_CONSTANTS */ + +int spi_print_msg(const unsigned char *msg) +{ + int len = 1, i; + + if (msg[0] == EXTENDED_MESSAGE) { + len = 2 + msg[1]; + if (len == 2) + len += 256; + for (i = 0; i < len; ++i) + printk("%02x ", msg[i]); + /* Identify */ + } else if (msg[0] & 0x80) { + printk("%02x ", msg[0]); + /* Normal One byte */ + } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) { + printk("%02x ", msg[0]); + /* Two byte */ + } else if (msg[0] <= 0x2f) { + printk("%02x %02x", msg[0], msg[1]); + len = 2; + } else + printk("%02x ", msg[0]); + return len; +} +EXPORT_SYMBOL(spi_print_msg); +#endif /* ! CONFIG_SCSI_CONSTANTS */ + +static int spi_device_match(struct attribute_container *cont, + struct device *dev) +{ + struct scsi_device *sdev; + struct Scsi_Host *shost; + struct spi_internal *i; + + if (!scsi_is_sdev_device(dev)) + return 0; + + sdev = to_scsi_device(dev); + shost = sdev->host; + if (!shost->transportt || shost->transportt->host_attrs.ac.class + != &spi_host_class.class) + return 0; + /* Note: this class has no device attributes, so it has + * no per-HBA allocation and thus we don't need to distinguish + * the attribute containers for the device */ + i = to_spi_internal(shost->transportt); + if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target)) + return 0; + return 1; +} + +static int spi_target_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + struct scsi_target *starget; + struct spi_internal *i; + + if (!scsi_is_target_device(dev)) + return 0; + + shost = dev_to_shost(dev->parent); + if (!shost->transportt || shost->transportt->host_attrs.ac.class + != &spi_host_class.class) + return 0; + + i = to_spi_internal(shost->transportt); + starget = to_scsi_target(dev); + + if (i->f->deny_binding && i->f->deny_binding(starget)) + return 0; + + return &i->t.target_attrs.ac == cont; +} + +static DECLARE_TRANSPORT_CLASS(spi_transport_class, + "spi_transport", + spi_setup_transport_attrs, + NULL, + spi_target_configure); + +static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, + spi_device_match, + spi_device_configure); + +static struct attribute *host_attributes[] = { + &dev_attr_signalling.attr, + &dev_attr_host_width.attr, + &dev_attr_hba_id.attr, + NULL +}; + +static struct attribute_group host_attribute_group = { + .attrs = host_attributes, +}; + +static int spi_host_configure(struct transport_container *tc, + struct device *dev, + struct device *cdev) +{ + struct kobject *kobj = &cdev->kobj; + struct Scsi_Host *shost = transport_class_to_shost(cdev); + struct spi_internal *si = to_spi_internal(shost->transportt); + struct attribute *attr = &dev_attr_signalling.attr; + int rc = 0; + + if (si->f->set_signalling) + rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR); + + return rc; +} + +/* returns true if we should be showing the variable. Also + * overloads the return by setting 1<<1 if the attribute should + * be writeable */ +#define TARGET_ATTRIBUTE_HELPER(name) \ + (si->f->show_##name ? S_IRUGO : 0) | \ + (si->f->set_##name ? S_IWUSR : 0) + +static umode_t target_attribute_is_visible(struct kobject *kobj, + struct attribute *attr, int i) +{ + struct device *cdev = container_of(kobj, struct device, kobj); + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = transport_class_to_shost(cdev); + struct spi_internal *si = to_spi_internal(shost->transportt); + + if (attr == &dev_attr_period.attr && + spi_support_sync(starget)) + return TARGET_ATTRIBUTE_HELPER(period); + else if (attr == &dev_attr_min_period.attr && + spi_support_sync(starget)) + return TARGET_ATTRIBUTE_HELPER(period); + else if (attr == &dev_attr_offset.attr && + spi_support_sync(starget)) + return TARGET_ATTRIBUTE_HELPER(offset); + else if (attr == &dev_attr_max_offset.attr && + spi_support_sync(starget)) + return TARGET_ATTRIBUTE_HELPER(offset); + else if (attr == &dev_attr_width.attr && + spi_support_wide(starget)) + return TARGET_ATTRIBUTE_HELPER(width); + else if (attr == &dev_attr_max_width.attr && + spi_support_wide(starget)) + return TARGET_ATTRIBUTE_HELPER(width); + else if (attr == &dev_attr_iu.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(iu); + else if (attr == &dev_attr_max_iu.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(iu); + else if (attr == &dev_attr_dt.attr && + spi_support_dt(starget)) + return TARGET_ATTRIBUTE_HELPER(dt); + else if (attr == &dev_attr_qas.attr && + spi_support_qas(starget)) + return TARGET_ATTRIBUTE_HELPER(qas); + else if (attr == &dev_attr_max_qas.attr && + spi_support_qas(starget)) + return TARGET_ATTRIBUTE_HELPER(qas); + else if (attr == &dev_attr_wr_flow.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(wr_flow); + else if (attr == &dev_attr_rd_strm.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(rd_strm); + else if (attr == &dev_attr_rti.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(rti); + else if (attr == &dev_attr_pcomp_en.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(pcomp_en); + else if (attr == &dev_attr_hold_mcs.attr && + spi_support_ius(starget)) + return TARGET_ATTRIBUTE_HELPER(hold_mcs); + else if (attr == &dev_attr_revalidate.attr) + return S_IWUSR; + + return 0; +} + +static struct attribute *target_attributes[] = { + &dev_attr_period.attr, + &dev_attr_min_period.attr, + &dev_attr_offset.attr, + &dev_attr_max_offset.attr, + &dev_attr_width.attr, + &dev_attr_max_width.attr, + &dev_attr_iu.attr, + &dev_attr_max_iu.attr, + &dev_attr_dt.attr, + &dev_attr_qas.attr, + &dev_attr_max_qas.attr, + &dev_attr_wr_flow.attr, + &dev_attr_rd_strm.attr, + &dev_attr_rti.attr, + &dev_attr_pcomp_en.attr, + &dev_attr_hold_mcs.attr, + &dev_attr_revalidate.attr, + NULL +}; + +static struct attribute_group target_attribute_group = { + .attrs = target_attributes, + .is_visible = target_attribute_is_visible, +}; + +static int spi_target_configure(struct transport_container *tc, + struct device *dev, + struct device *cdev) +{ + struct kobject *kobj = &cdev->kobj; + + /* force an update based on parameters read from the device */ + sysfs_update_group(kobj, &target_attribute_group); + + return 0; +} + +struct scsi_transport_template * +spi_attach_transport(struct spi_function_template *ft) +{ + struct spi_internal *i = kzalloc(sizeof(struct spi_internal), + GFP_KERNEL); + + if (unlikely(!i)) + return NULL; + + i->t.target_attrs.ac.class = &spi_transport_class.class; + i->t.target_attrs.ac.grp = &target_attribute_group; + i->t.target_attrs.ac.match = spi_target_match; + transport_container_register(&i->t.target_attrs); + i->t.target_size = sizeof(struct spi_transport_attrs); + i->t.host_attrs.ac.class = &spi_host_class.class; + i->t.host_attrs.ac.grp = &host_attribute_group; + i->t.host_attrs.ac.match = spi_host_match; + transport_container_register(&i->t.host_attrs); + i->t.host_size = sizeof(struct spi_host_attrs); + i->f = ft; + + return &i->t; +} +EXPORT_SYMBOL(spi_attach_transport); + +void spi_release_transport(struct scsi_transport_template *t) +{ + struct spi_internal *i = to_spi_internal(t); + + transport_container_unregister(&i->t.target_attrs); + transport_container_unregister(&i->t.host_attrs); + + kfree(i); +} +EXPORT_SYMBOL(spi_release_transport); + +static __init int spi_transport_init(void) +{ + int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI, + "SCSI Parallel Transport Class"); + if (!error) { + int i; + + for (i = 0; spi_static_device_list[i].vendor; i++) + scsi_dev_info_list_add_keyed(1, /* compatible */ + spi_static_device_list[i].vendor, + spi_static_device_list[i].model, + NULL, + spi_static_device_list[i].flags, + SCSI_DEVINFO_SPI); + } + + error = transport_class_register(&spi_transport_class); + if (error) + return error; + error = anon_transport_class_register(&spi_device_class); + return transport_class_register(&spi_host_class); +} + +static void __exit spi_transport_exit(void) +{ + transport_class_unregister(&spi_transport_class); + anon_transport_class_unregister(&spi_device_class); + transport_class_unregister(&spi_host_class); + scsi_dev_info_remove_list(SCSI_DEVINFO_SPI); +} + +MODULE_AUTHOR("Martin Hicks"); +MODULE_DESCRIPTION("SPI Transport Attributes"); +MODULE_LICENSE("GPL"); + +module_init(spi_transport_init); +module_exit(spi_transport_exit); |