From 5dc2b89e124251662f580f4ba3c9f6195d1eaff6 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Sat, 1 Sep 2007 02:02:20 +0900 Subject: [PATCH] [SCSI] add supported_mode and active_mode attributes to the host This adds supported_mode and active_mode attributes to /sys/class/sys_host/hostX/ for specifying the mode that a lld supports and the currently activated mode. The output format is similar to fc rport roles: luce:/sys/class/scsi_host/host0$ cat supported_mode Initiator luce:/sys/class/scsi_host/host0$ cat active_mode Initiator The mode values uses bitmap since we would support dual-mode llds in the future like this: luce:/sys/class/scsi_host/host0$ cat supported_mode Initiator, Target The supported_mode attribute looks at a scsi_host_template and the active_mode attribute looks at a scsi_host. We would add a hook to a scsi_host_template to change the active_mode attribute dynamically. But now there is no hook since no lld supports that feature. Signed-off-by: FUJITA Tomonori Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- drivers/scsi/hosts.c | 1 + drivers/scsi/scsi_sysfs.c | 42 +++++++++++++++++++++++++++++++++++++++ include/scsi/scsi_host.h | 9 +++++++++ 3 files changed, 52 insertions(+) diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 96bc31266c98..adc9559cb6f4 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -342,6 +342,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) shost->unchecked_isa_dma = sht->unchecked_isa_dma; shost->use_clustering = sht->use_clustering; shost->ordered_tag = sht->ordered_tag; + shost->active_mode = sht->supported_mode; if (sht->max_host_blocked) shost->max_host_blocked = sht->max_host_blocked; diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 34cdce6738a6..a3d227f3f520 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -190,6 +190,46 @@ show_shost_state(struct class_device *class_dev, char *buf) static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); +static ssize_t +show_shost_mode(unsigned int mode, char *buf) +{ + ssize_t len = 0; + + if (mode & MODE_INITIATOR) + len = sprintf(buf, "%s", "Initiator"); + + if (mode & MODE_TARGET) + len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); + + len += sprintf(buf + len, "\n"); + + return len; +} + +static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + + if (shost->hostt->supported_mode == MODE_UNKNOWN) + return snprintf(buf, 20, "unknown\n"); + else + return show_shost_mode(shost->hostt->supported_mode, buf); +} + +static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); + +static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + + if (shost->active_mode == MODE_UNKNOWN) + return snprintf(buf, 20, "unknown\n"); + else + return show_shost_mode(shost->active_mode, buf); +} + +static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); + shost_rd_attr(unique_id, "%u\n"); shost_rd_attr(host_busy, "%hu\n"); shost_rd_attr(cmd_per_lun, "%hd\n"); @@ -208,6 +248,8 @@ static struct class_device_attribute *scsi_sysfs_shost_attrs[] = { &class_device_attr_proc_name, &class_device_attr_scan, &class_device_attr_state, + &class_device_attr_supported_mode, + &class_device_attr_active_mode, NULL }; diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 88f6871badd8..5b79697a3a80 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -32,6 +32,9 @@ struct blk_queue_tags; #define SG_NONE 0 #define SG_ALL 0xff +#define MODE_UNKNOWN 0x00 +#define MODE_INITIATOR 0x01 +#define MODE_TARGET 0x02 #define DISABLE_CLUSTERING 0 #define ENABLE_CLUSTERING 1 @@ -404,6 +407,11 @@ struct scsi_host_template { */ unsigned char present; + /* + * This specifies the mode that a LLD supports. + */ + unsigned supported_mode:2; + /* * true if this host adapter uses unchecked DMA onto an ISA bus. */ @@ -574,6 +582,7 @@ struct Scsi_Host { */ unsigned long cmd_serial_number, cmd_pid; + unsigned active_mode:2; unsigned unchecked_isa_dma:1; unsigned use_clustering:1; unsigned use_blk_tcq:1;