From: Michael Tokarev Date: Fri, 27 Oct 2006 12:02:37 +0000 (+0400) Subject: [SCSI] modalias for scsi devices X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d7b8bcb0a0819315a51cae620ff7ae0c1704c069;p=linux-beck.git [SCSI] modalias for scsi devices The following patch adds support for sysfs/uevent modalias attribute for scsi devices (like disks, tapes, cdroms etc), based on whatever current sd.c, sr.c, st.c and osst.c drivers supports. The modalias format is like this: scsi:type-0x04 (for TYPE_WORM, handled by sr.c now). Several comments. o This hexadecimal type value is because all TYPE_XXX constants in include/scsi/scsi.h are given in hex, but __stringify() will not convert them to decimal (so it will NOT be scsi:type-4). Since it does not really matter in which format it is, while both modalias in module and modalias attribute match each other, I descided to go for that 0x%02x format (and added a comment in include/scsi/scsi.h to keep them that way), instead of changing them all to decimal. o There was no .uevent routine for SCSI bus. It might be a good idea to add some more ueven environment variables in there. o osst.c driver handles tapes too, like st.c, but only SOME tapes. With this setup, hotplug scripts (or whatever is used by the user) will try to load both st and osst modules for all SCSI tapes found, because both modules have scsi:type-0x01 alias). It is not harmful, but one extra module is no good either. It is possible to solve this, by exporting more info in modalias attribute, including vendor and device identification strings, so that modalias becomes something like scsi:type-0x12:vendor-Adaptec LTD:device-OnStream Tape Drive and having that, match for all 3 attributes, not only device type. But oh well, vendor and device strings may be large, and they do contain spaces and whatnot. So I left them for now, awaiting for comments first. Signed-off-by: Michael Tokarev Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c index a967fadb7439..08060fb478b6 100644 --- a/drivers/scsi/osst.c +++ b/drivers/scsi/osst.c @@ -87,6 +87,7 @@ MODULE_AUTHOR("Willem Riede"); MODULE_DESCRIPTION("OnStream {DI-|FW-|SC-|USB}{30|50} Tape Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS_CHARDEV_MAJOR(OSST_MAJOR); +MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); module_param(max_dev, int, 0444); MODULE_PARM_DESC(max_dev, "Maximum number of OnStream Tape Drives to attach (4)"); diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 96db51c40ef3..5326f5cbeae9 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -276,6 +276,19 @@ static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; } +static int scsi_bus_uevent(struct device *dev, char **envp, int num_envp, + char *buffer, int buffer_size) +{ + struct scsi_device *sdev = to_scsi_device(dev); + int i = 0; + int length = 0; + + add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, + "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); + envp[i] = NULL; + return 0; +} + static int scsi_bus_suspend(struct device * dev, pm_message_t state) { struct device_driver *drv = dev->driver; @@ -331,6 +344,7 @@ static int scsi_bus_resume(struct device * dev) struct bus_type scsi_bus_type = { .name = "scsi", .match = scsi_bus_match, + .uevent = scsi_bus_uevent, .suspend = scsi_bus_suspend, .resume = scsi_bus_resume, }; @@ -558,6 +572,14 @@ show_sdev_iostat(iorequest_cnt); show_sdev_iostat(iodone_cnt); show_sdev_iostat(ioerr_cnt); +static ssize_t +sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev; + sdev = to_scsi_device(dev); + return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); +} +static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); /* Default template for device attributes. May NOT be modified */ static struct device_attribute *scsi_sysfs_sdev_attrs[] = { @@ -577,6 +599,7 @@ static struct device_attribute *scsi_sysfs_sdev_attrs[] = { &dev_attr_iorequest_cnt, &dev_attr_iodone_cnt, &dev_attr_ioerr_cnt, + &dev_attr_modalias, NULL }; diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index b044dcf73427..00e46662296f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -82,6 +82,9 @@ MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); +MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); +MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); +MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); static DEFINE_IDR(sd_index_idr); static DEFINE_SPINLOCK(sd_index_lock); diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 1857d68e7195..f9a52af7f5b4 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -62,6 +62,8 @@ MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); +MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); +MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); #define SR_DISKS 256 diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 98d8411bbccc..55bfeccf68a2 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -89,6 +89,7 @@ MODULE_AUTHOR("Kai Makisara"); MODULE_DESCRIPTION("SCSI tape (st) driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); +MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); /* Set 'perm' (4th argument) to 0 to disable module_param's definition * of sysfs parameters (which module_param doesn't yet support). diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h index 5c0e9791441c..9f8f80ab0c8b 100644 --- a/include/scsi/scsi.h +++ b/include/scsi/scsi.h @@ -203,6 +203,7 @@ static inline int scsi_status_is_good(int status) /* * DEVICE TYPES + * Please keep them in 0x%02x format for $MODALIAS to work */ #define TYPE_DISK 0x00 diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index b05cd3b09e6e..2f3c5b8b1d6a 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -358,4 +358,9 @@ static inline int scsi_device_qas(struct scsi_device *sdev) return 0; return sdev->inquiry[56] & 0x02; } + +#define MODULE_ALIAS_SCSI_DEVICE(type) \ + MODULE_ALIAS("scsi:t-" __stringify(type) "*") +#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" + #endif /* _SCSI_SCSI_DEVICE_H */