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[SCSI] scsi: Added support for adapter and firmware reset
Added new sysfs attr 'host_reset' in scsi_sysfs.c to perform adapter or firmware reset as suggested by Mike Christie here: http://marc.info/?l=linux-scsi&m=127359347111167&w=2 user/application can write "adapter" or "firmware" on this attr and it will call newly added function hook in scsi_host_template to call LDD adapter or firmware reset implementation. Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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@ -246,6 +246,43 @@ show_shost_active_mode(struct device *dev,
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static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
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static int check_reset_type(char *str)
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{
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if (strncmp(str, "adapter", 10) == 0)
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return SCSI_ADAPTER_RESET;
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else if (strncmp(str, "firmware", 10) == 0)
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return SCSI_FIRMWARE_RESET;
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else
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return 0;
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}
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static ssize_t
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store_host_reset(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct Scsi_Host *shost = class_to_shost(dev);
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struct scsi_host_template *sht = shost->hostt;
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int ret = -EINVAL;
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char str[10];
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int type;
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sscanf(buf, "%s", str);
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type = check_reset_type(str);
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if (!type)
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goto exit_store_host_reset;
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if (sht->host_reset)
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ret = sht->host_reset(shost, type);
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exit_store_host_reset:
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if (ret == 0)
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ret = count;
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return ret;
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}
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static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
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shost_rd_attr(unique_id, "%u\n");
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shost_rd_attr(host_busy, "%hu\n");
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shost_rd_attr(cmd_per_lun, "%hd\n");
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@ -272,6 +309,7 @@ static struct attribute *scsi_sysfs_shost_attrs[] = {
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&dev_attr_active_mode.attr,
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&dev_attr_prot_capabilities.attr,
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&dev_attr_prot_guard_type.attr,
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&dev_attr_host_reset.attr,
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NULL
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};
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@ -355,6 +355,19 @@ struct scsi_host_template {
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*/
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enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
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/* This is an optional routine that allows transport to initiate
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* LLD adapter or firmware reset using sysfs attribute.
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*
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* Return values: 0 on success, -ve value on failure.
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*
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* Status: OPTIONAL
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*/
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int (*host_reset)(struct Scsi_Host *shost, int reset_type);
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#define SCSI_ADAPTER_RESET 1
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#define SCSI_FIRMWARE_RESET 2
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/*
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* Name of proc directory
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*/
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