[SCSI] implement parameter limits in the SPI transport class
There's a basic need not to have parameters go under or over certain values when doing domain validation. The basic ones are max_offset, max_width and min_period This patch makes the transport class take and enforce these three limits. Currently they can be set by the user, although they could obviously be read from the HBA's on-board NVRAM area during slave_configure (if it has one). Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley
James Bottomley
parent
88d7bd8cb9
commit
62a8612972
2 changed files with 167 additions and 27 deletions
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@ -35,7 +35,7 @@
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#define SPI_PRINTK(x, l, f, a...) dev_printk(l, &(x)->dev, f , ##a)
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#define SPI_NUM_ATTRS 10 /* increase this if you add attributes */
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#define SPI_NUM_ATTRS 13 /* increase this if you add attributes */
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#define SPI_OTHER_ATTRS 1 /* Increase this if you add "always
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* on" attributes */
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#define SPI_HOST_ATTRS 1
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@ -219,8 +219,11 @@ static int spi_setup_transport_attrs(struct device *dev)
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struct scsi_target *starget = to_scsi_target(dev);
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spi_period(starget) = -1; /* illegal value */
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spi_min_period(starget) = 0;
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spi_offset(starget) = 0; /* async */
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spi_max_offset(starget) = 255;
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spi_width(starget) = 0; /* narrow */
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spi_max_width(starget) = 1;
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spi_iu(starget) = 0; /* no IU */
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spi_dt(starget) = 0; /* ST */
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spi_qas(starget) = 0;
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@ -235,6 +238,34 @@ static int spi_setup_transport_attrs(struct device *dev)
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return 0;
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}
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#define spi_transport_show_simple(field, format_string) \
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\
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static ssize_t \
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show_spi_transport_##field(struct class_device *cdev, char *buf) \
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{ \
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struct scsi_target *starget = transport_class_to_starget(cdev); \
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struct spi_transport_attrs *tp; \
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\
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tp = (struct spi_transport_attrs *)&starget->starget_data; \
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return snprintf(buf, 20, format_string, tp->field); \
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}
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#define spi_transport_store_simple(field, format_string) \
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\
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static ssize_t \
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store_spi_transport_##field(struct class_device *cdev, const char *buf, \
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size_t count) \
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{ \
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int val; \
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struct scsi_target *starget = transport_class_to_starget(cdev); \
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struct spi_transport_attrs *tp; \
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\
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tp = (struct spi_transport_attrs *)&starget->starget_data; \
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val = simple_strtoul(buf, NULL, 0); \
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tp->field = val; \
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return count; \
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}
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#define spi_transport_show_function(field, format_string) \
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\
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static ssize_t \
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@ -261,6 +292,25 @@ store_spi_transport_##field(struct class_device *cdev, const char *buf, \
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struct spi_internal *i = to_spi_internal(shost->transportt); \
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\
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val = simple_strtoul(buf, NULL, 0); \
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i->f->set_##field(starget, val); \
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return count; \
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}
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#define spi_transport_store_max(field, format_string) \
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static ssize_t \
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store_spi_transport_##field(struct class_device *cdev, const char *buf, \
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size_t count) \
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{ \
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int val; \
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struct scsi_target *starget = transport_class_to_starget(cdev); \
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
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struct spi_internal *i = to_spi_internal(shost->transportt); \
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struct spi_transport_attrs *tp \
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= (struct spi_transport_attrs *)&starget->starget_data; \
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\
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val = simple_strtoul(buf, NULL, 0); \
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if (val > tp->max_##field) \
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val = tp->max_##field; \
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i->f->set_##field(starget, val); \
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return count; \
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}
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@ -272,9 +322,24 @@ static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
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show_spi_transport_##field, \
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store_spi_transport_##field);
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#define spi_transport_simple_attr(field, format_string) \
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spi_transport_show_simple(field, format_string) \
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spi_transport_store_simple(field, format_string) \
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static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
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show_spi_transport_##field, \
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store_spi_transport_##field);
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#define spi_transport_max_attr(field, format_string) \
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spi_transport_show_function(field, format_string) \
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spi_transport_store_max(field, format_string) \
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spi_transport_simple_attr(max_##field, format_string) \
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static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
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show_spi_transport_##field, \
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store_spi_transport_##field);
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/* The Parallel SCSI Tranport Attributes: */
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spi_transport_rd_attr(offset, "%d\n");
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spi_transport_rd_attr(width, "%d\n");
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spi_transport_max_attr(offset, "%d\n");
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spi_transport_max_attr(width, "%d\n");
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spi_transport_rd_attr(iu, "%d\n");
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spi_transport_rd_attr(dt, "%d\n");
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spi_transport_rd_attr(qas, "%d\n");
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@ -300,26 +365,18 @@ static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
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/* Translate the period into ns according to the current spec
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* for SDTR/PPR messages */
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static ssize_t show_spi_transport_period(struct class_device *cdev, char *buf)
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static ssize_t
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show_spi_transport_period_helper(struct class_device *cdev, char *buf,
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int period)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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struct spi_transport_attrs *tp;
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int len, picosec;
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struct spi_internal *i = to_spi_internal(shost->transportt);
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tp = (struct spi_transport_attrs *)&starget->starget_data;
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if (i->f->get_period)
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i->f->get_period(starget);
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if (tp->period < 0 || tp->period > 0xff) {
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if (period < 0 || period > 0xff) {
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picosec = -1;
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} else if (tp->period <= SPI_STATIC_PPR) {
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picosec = ppr_to_ps[tp->period];
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} else if (period <= SPI_STATIC_PPR) {
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picosec = ppr_to_ps[period];
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} else {
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picosec = tp->period * 4000;
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picosec = period * 4000;
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}
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if (picosec == -1) {
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@ -334,12 +391,9 @@ static ssize_t show_spi_transport_period(struct class_device *cdev, char *buf)
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}
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static ssize_t
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store_spi_transport_period(struct class_device *cdev, const char *buf,
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size_t count)
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store_spi_transport_period_helper(struct class_device *cdev, const char *buf,
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size_t count, int *periodp)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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struct spi_internal *i = to_spi_internal(shost->transportt);
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int j, picosec, period = -1;
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char *endp;
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@ -368,15 +422,79 @@ store_spi_transport_period(struct class_device *cdev, const char *buf,
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if (period > 0xff)
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period = 0xff;
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i->f->set_period(starget, period);
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*periodp = period;
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return count;
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}
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static ssize_t
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show_spi_transport_period(struct class_device *cdev, char *buf)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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struct spi_internal *i = to_spi_internal(shost->transportt);
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struct spi_transport_attrs *tp =
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(struct spi_transport_attrs *)&starget->starget_data;
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if (i->f->get_period)
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i->f->get_period(starget);
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return show_spi_transport_period_helper(cdev, buf, tp->period);
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}
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static ssize_t
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store_spi_transport_period(struct class_device *cdev, const char *buf,
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size_t count)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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struct spi_internal *i = to_spi_internal(shost->transportt);
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struct spi_transport_attrs *tp =
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(struct spi_transport_attrs *)&starget->starget_data;
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int period, retval;
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retval = store_spi_transport_period_helper(cdev, buf, count, &period);
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if (period < tp->min_period)
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period = tp->min_period;
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i->f->set_period(starget, period);
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return retval;
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}
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static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR,
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show_spi_transport_period,
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store_spi_transport_period);
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static ssize_t
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show_spi_transport_min_period(struct class_device *cdev, char *buf)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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struct spi_transport_attrs *tp =
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(struct spi_transport_attrs *)&starget->starget_data;
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return show_spi_transport_period_helper(cdev, buf, tp->min_period);
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}
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static ssize_t
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store_spi_transport_min_period(struct class_device *cdev, const char *buf,
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size_t count)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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struct spi_transport_attrs *tp =
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(struct spi_transport_attrs *)&starget->starget_data;
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return store_spi_transport_period_helper(cdev, buf, count,
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&tp->min_period);
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}
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static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR,
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show_spi_transport_min_period,
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store_spi_transport_min_period);
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static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
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{
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struct Scsi_Host *shost = transport_class_to_shost(cdev);
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@ -642,6 +760,7 @@ spi_dv_device_internal(struct scsi_request *sreq, u8 *buffer)
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{
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struct spi_internal *i = to_spi_internal(sreq->sr_host->transportt);
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struct scsi_device *sdev = sreq->sr_device;
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struct scsi_target *starget = sdev->sdev_target;
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int len = sdev->inquiry_len;
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/* first set us up for narrow async */
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DV_SET(offset, 0);
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@ -655,9 +774,11 @@ spi_dv_device_internal(struct scsi_request *sreq, u8 *buffer)
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}
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/* test width */
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if (i->f->set_width && sdev->wdtr) {
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if (i->f->set_width && spi_max_width(starget) && sdev->wdtr) {
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i->f->set_width(sdev->sdev_target, 1);
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printk("WIDTH IS %d\n", spi_max_width(starget));
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if (spi_dv_device_compare_inquiry(sreq, buffer,
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buffer + len,
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DV_LOOPS)
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@ -684,8 +805,8 @@ spi_dv_device_internal(struct scsi_request *sreq, u8 *buffer)
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retry:
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/* now set up to the maximum */
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DV_SET(offset, 255);
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DV_SET(period, 1);
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DV_SET(offset, spi_max_offset(starget));
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DV_SET(period, spi_min_period(starget));
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if (len == 0) {
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SPI_PRINTK(sdev->sdev_target, KERN_INFO, "Domain Validation skipping write tests\n");
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@ -892,6 +1013,16 @@ EXPORT_SYMBOL(spi_display_xfer_agreement);
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if (i->f->show_##field) \
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count++
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#define SETUP_RELATED_ATTRIBUTE(field, rel_field) \
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i->private_attrs[count] = class_device_attr_##field; \
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if (!i->f->set_##rel_field) { \
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i->private_attrs[count].attr.mode = S_IRUGO; \
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i->private_attrs[count].store = NULL; \
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} \
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i->attrs[count] = &i->private_attrs[count]; \
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if (i->f->show_##rel_field) \
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count++
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#define SETUP_HOST_ATTRIBUTE(field) \
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i->private_host_attrs[count] = class_device_attr_##field; \
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if (!i->f->set_##field) { \
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@ -975,8 +1106,11 @@ spi_attach_transport(struct spi_function_template *ft)
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i->f = ft;
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SETUP_ATTRIBUTE(period);
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SETUP_RELATED_ATTRIBUTE(min_period, period);
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SETUP_ATTRIBUTE(offset);
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SETUP_RELATED_ATTRIBUTE(max_offset, offset);
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SETUP_ATTRIBUTE(width);
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SETUP_RELATED_ATTRIBUTE(max_width, width);
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SETUP_ATTRIBUTE(iu);
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SETUP_ATTRIBUTE(dt);
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SETUP_ATTRIBUTE(qas);
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@ -27,8 +27,11 @@ struct scsi_transport_template;
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struct spi_transport_attrs {
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int period; /* value in the PPR/SDTR command */
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int min_period;
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int offset;
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int max_offset;
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unsigned int width:1; /* 0 - narrow, 1 - wide */
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unsigned int max_width:1;
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unsigned int iu:1; /* Information Units enabled */
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unsigned int dt:1; /* DT clocking enabled */
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unsigned int qas:1; /* Quick Arbitration and Selection enabled */
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@ -63,8 +66,11 @@ struct spi_host_attrs {
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/* accessor functions */
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#define spi_period(x) (((struct spi_transport_attrs *)&(x)->starget_data)->period)
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#define spi_min_period(x) (((struct spi_transport_attrs *)&(x)->starget_data)->min_period)
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#define spi_offset(x) (((struct spi_transport_attrs *)&(x)->starget_data)->offset)
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#define spi_max_offset(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_offset)
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#define spi_width(x) (((struct spi_transport_attrs *)&(x)->starget_data)->width)
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#define spi_max_width(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_width)
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#define spi_iu(x) (((struct spi_transport_attrs *)&(x)->starget_data)->iu)
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#define spi_dt(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dt)
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#define spi_qas(x) (((struct spi_transport_attrs *)&(x)->starget_data)->qas)
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