diff options
| -rw-r--r-- | Documentation/scsi/scsi-changer.txt | 180 | ||||
| -rw-r--r-- | drivers/scsi/Kconfig | 18 | ||||
| -rw-r--r-- | drivers/scsi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/scsi/ch.c | 1025 | ||||
| -rw-r--r-- | include/linux/chio.h | 168 | ||||
| -rw-r--r-- | include/linux/major.h | 1 | ||||
| -rw-r--r-- | include/scsi/scsi.h | 3 |
7 files changed, 1396 insertions, 0 deletions
diff --git a/Documentation/scsi/scsi-changer.txt b/Documentation/scsi/scsi-changer.txt new file mode 100644 index 0000000..c132687 --- /dev/null +++ b/Documentation/scsi/scsi-changer.txt @@ -0,0 +1,180 @@ + +README for the SCSI media changer driver +======================================== + +This is a driver for SCSI Medium Changer devices, which are listed +with "Type: Medium Changer" in /proc/scsi/scsi. + +This is for *real* Jukeboxes. It is *not* supported to work with +common small CD-ROM changers, neither one-lun-per-slot SCSI changers +nor IDE drives. + +Userland tools available from here: + http://linux.bytesex.org/misc/changer.html + + +General Information +------------------- + +First some words about how changers work: A changer has 2 (possibly +more) SCSI ID's. One for the changer device which controls the robot, +and one for the device which actually reads and writes the data. The +later may be anything, a MOD, a CD-ROM, a tape or whatever. For the +changer device this is a "don't care", he *only* shuffles around the +media, nothing else. + + +The SCSI changer model is complex, compared to - for example - IDE-CD +changers. But it allows to handle nearly all possible cases. It knows +4 different types of changer elements: + + media transport - this one shuffles around the media, i.e. the + transport arm. Also known as "picker". + storage - a slot which can hold a media. + import/export - the same as above, but is accessable from outside, + i.e. there the operator (you !) can use this to + fill in and remove media from the changer. + Sometimes named "mailslot". + data transfer - this is the device which reads/writes, i.e. the + CD-ROM / Tape / whatever drive. + +None of these is limited to one: A huge Jukebox could have slots for +123 CD-ROM's, 5 CD-ROM readers (and therefore 6 SCSI ID's: the changer +and each CD-ROM) and 2 transport arms. No problem to handle. + + +How it is implemented +--------------------- + +I implemented the driver as character device driver with a NetBSD-like +ioctl interface. Just grabbed NetBSD's header file and one of the +other linux SCSI device drivers as starting point. The interface +should be source code compatible with NetBSD. So if there is any +software (anybody knows ???) which supports a BSDish changer driver, +it should work with this driver too. + +Over time a few more ioctls where added, volume tag support for example +wasn't covered by the NetBSD ioctl API. + + +Current State +------------- + +Support for more than one transport arm is not implemented yet (and +nobody asked for it so far...). + +I test and use the driver myself with a 35 slot cdrom jukebox from +Grundig. I got some reports telling it works ok with tape autoloaders +(Exabyte, HP and DEC). Some People use this driver with amanda. It +works fine with small (11 slots) and a huge (4 MOs, 88 slots) +magneto-optical Jukebox. Probably with lots of other changers too, most +(but not all :-) people mail me only if it does *not* work... + +I don't have any device lists, neither black-list nor white-list. Thus +it is quite useless to ask me whenever a specific device is supported or +not. In theory every changer device which supports the SCSI-2 media +changer command set should work out-of-the-box with this driver. If it +doesn't, it is a bug. Either within the driver or within the firmware +of the changer device. + + +Using it +-------- + +This is a character device with major number is 86, so use +"mknod /dev/sch0 c 86 0" to create the special file for the driver. + +If the module finds the changer, it prints some messages about the +device [ try "dmesg" if you don't see anything ] and should show up in +/proc/devices. If not.... some changers use ID ? / LUN 0 for the +device and ID ? / LUN 1 for the robot mechanism. But Linux does *not* +look for LUN's other than 0 as default, becauce there are to many +broken devices. So you can try: + + 1) echo "scsi add-single-device 0 0 ID 1" > /proc/scsi/scsi + (replace ID with the SCSI-ID of the device) + 2) boot the kernel with "max_scsi_luns=1" on the command line + (append="max_scsi_luns=1" in lilo.conf should do the trick) + + +Trouble? +-------- + +If you insmod the driver with "insmod debug=1", it will be verbose and +prints a lot of stuff to the syslog. Compiling the kernel with +CONFIG_SCSI_CONSTANTS=y improves the quality of the error messages alot +because the kernel will translate the error codes into human-readable +strings then. + +You can display these messages with the dmesg command (or check the +logfiles). If you email me some question becauce of a problem with the +driver, please include these messages. + + +Insmod options +-------------- + +debug=0/1 + Enable debug messages (see above, default: 0). + +verbose=0/1 + Be verbose (default: 1). + +init=0/1 + Send INITIALIZE ELEMENT STATUS command to the changer + at insmod time (default: 1). + +timeout_init=<seconds> + timeout for the INITIALIZE ELEMENT STATUS command + (default: 3600). + +timeout_move=<seconds> + timeout for all other commands (default: 120). + +dt_id=<id1>,<id2>,... +dt_lun=<lun1>,<lun2>,... + These two allow to specify the SCSI ID and LUN for the data + transfer elements. You likely don't need this as the jukebox + should provide this information. But some devices don't ... + +vendor_firsts= +vendor_counts= +vendor_labels= + These insmod options can be used to tell the driver that there + are some vendor-specific element types. Grundig for example + does this. Some jukeboxes have a printer to label fresh burned + CDs, which is addressed as element 0xc000 (type 5). To tell the + driver about this vendor-specific element, use this: + $ insmod ch \ + vendor_firsts=0xc000 \ + vendor_counts=1 \ + vendor_labels=printer + All three insmod options accept up to four comma-separated + values, this way you can configure the element types 5-8. + You likely need the SCSI specs for the device in question to + find the correct values as they are not covered by the SCSI-2 + standard. + + +Credits +------- + +I wrote this driver using the famous mailing-patches-around-the-world +method. With (more or less) help from: + + Daniel Moehwald <moehwald@hdg.de> + Dane Jasper <dane@sonic.net> + R. Scott Bailey <sbailey@dsddi.eds.com> + Jonathan Corbet <corbet@lwn.net> + +Special thanks go to + Martin Kuehne <martin.kuehne@bnbt.de> +for a old, second-hand (but full functional) cdrom jukebox which I use +to develop/test driver and tools now. + +Have fun, + + Gerd + +-- +Gerd Knorr <kraxel@bytesex.org> diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 2ef5aee..ba88be3 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -137,6 +137,24 @@ config CHR_DEV_SG If unsure, say N. +config CHR_DEV_SCH + tristate "SCSI media changer support" + depends on SCSI + ---help--- + This is a driver for SCSI media changers. Most common devices are + tape libraries and MOD/CDROM jukeboxes. *Real* jukeboxes, you + don't need this for those tiny 6-slot cdrom changers. Media + changers are listed as "Type: Medium Changer" in /proc/scsi/scsi. + If you have such hardware and want to use it with linux, say Y + here. Check <file:Documentation/scsi-changer.txt> for details. + + If you want to compile this as a module ( = code which can be + inserted in and removed from the running kernel whenever you want), + say M here and read <file:Documentation/modules.txt> and + <file:Documentation/scsi.txt>. The module will be called ch.o. + If unsure, say N. + + comment "Some SCSI devices (e.g. CD jukebox) support multiple LUNs" depends on SCSI diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index 51d9c1e..3746fb9 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -140,6 +140,7 @@ obj-$(CONFIG_CHR_DEV_OSST) += osst.o obj-$(CONFIG_BLK_DEV_SD) += sd_mod.o obj-$(CONFIG_BLK_DEV_SR) += sr_mod.o obj-$(CONFIG_CHR_DEV_SG) += sg.o +obj-$(CONFIG_CHR_DEV_SCH) += ch.o scsi_mod-y += scsi.o hosts.o scsi_ioctl.o constants.o \ scsicam.o scsi_error.o scsi_lib.o \ diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c new file mode 100644 index 0000000..44f5a71 --- /dev/null +++ b/drivers/scsi/ch.c @@ -0,0 +1,1025 @@ +/* + * SCSI Media Changer device driver for Linux 2.6 + * + * (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org> + * + */ + +#define VERSION "0.25" + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/major.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/blkdev.h> +#include <linux/completion.h> +#include <linux/devfs_fs_kernel.h> +#include <linux/ioctl32.h> +#include <linux/compat.h> +#include <linux/chio.h> /* here are all the ioctls */ + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_driver.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_request.h> +#include <scsi/scsi_dbg.h> + +#define CH_DT_MAX 16 +#define CH_TYPES 8 + +MODULE_DESCRIPTION("device driver for scsi media changer devices"); +MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>"); +MODULE_LICENSE("GPL"); + +static int init = 1; +module_param(init, int, 0444); +MODULE_PARM_DESC(init, \ + "initialize element status on driver load (default: on)"); + +static int timeout_move = 300; +module_param(timeout_move, int, 0644); +MODULE_PARM_DESC(timeout_move,"timeout for move commands " + "(default: 300 seconds)"); + +static int timeout_init = 3600; +module_param(timeout_init, int, 0644); +MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS " + "(default: 3600 seconds)"); + +static int verbose = 1; +module_param(verbose, int, 0644); +MODULE_PARM_DESC(verbose,"be verbose (default: on)"); + +static int debug = 0; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more " + "detailed sense codes on scsi errors (default: off)"); + +static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 }; +static int dt_lun[CH_DT_MAX]; +module_param_array(dt_id, int, NULL, 0444); +module_param_array(dt_lun, int, NULL, 0444); + +/* tell the driver about vendor-specific slots */ +static int vendor_firsts[CH_TYPES-4]; +static int vendor_counts[CH_TYPES-4]; +module_param_array(vendor_firsts, int, NULL, 0444); +module_param_array(vendor_counts, int, NULL, 0444); + +static char *vendor_labels[CH_TYPES-4] = { + "v0", "v1", "v2", "v3" +}; +// module_param_string_array(vendor_labels, NULL, 0444); + +#define dprintk(fmt, arg...) if (debug) \ + printk(KERN_DEBUG "%s: " fmt, ch->name , ## arg) +#define vprintk(fmt, arg...) if (verbose) \ + printk(KERN_INFO "%s: " fmt, ch->name , ## arg) + +/* ------------------------------------------------------------------- */ + +#define MAX_RETRIES 1 + +static int ch_probe(struct device *); +static int ch_remove(struct device *); +static int ch_open(struct inode * inode, struct file * filp); +static int ch_release(struct inode * inode, struct file * filp); +static int ch_ioctl(struct inode * inode, struct file * filp, + unsigned int cmd, unsigned long arg); +#ifdef CONFIG_COMPAT +static long ch_ioctl_compat(struct file * filp, + unsigned int cmd, unsigned long arg); +#endif + +static struct class_simple * ch_sysfs_class; + +typedef struct { + struct list_head list; + int minor; + char name[8]; + struct scsi_device *device; + struct scsi_device **dt; /* ptrs to data transfer elements */ + u_int firsts[CH_TYPES]; + u_int counts[CH_TYPES]; + u_int unit_attention; + u_int voltags; + struct semaphore lock; +} scsi_changer; + +static LIST_HEAD(ch_devlist); +static spinlock_t ch_devlist_lock = SPIN_LOCK_UNLOCKED; +static int ch_devcount; + +static struct scsi_driver ch_template = +{ + .owner = THIS_MODULE, + .gendrv = { + .name = "ch", + .probe = ch_probe, + .remove = ch_remove, + }, +}; + +static struct file_operations changer_fops = +{ + .owner = THIS_MODULE, + .open = ch_open, + .release = ch_release, + .ioctl = ch_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = ch_ioctl_compat, +#endif +}; + +static struct { + unsigned char sense; + unsigned char asc; + unsigned char ascq; + int errno; +} err[] = { +/* Just filled in what looks right. Hav'nt checked any standard paper for + these errno assignments, so they may be wrong... */ + { + .sense = ILLEGAL_REQUEST, + .asc = 0x21, + .ascq = 0x01, + .errno = EBADSLT, /* Invalid element address */ + },{ + .sense = ILLEGAL_REQUEST, + .asc = 0x28, + .ascq = 0x01, + .errno = EBADE, /* Import or export element accessed */ + },{ + .sense = ILLEGAL_REQUEST, + .asc = 0x3B, + .ascq = 0x0D, + .errno = EXFULL, /* Medium destination element full */ + },{ + .sense = ILLEGAL_REQUEST, + .asc = 0x3B, + .ascq = 0x0E, + .errno = EBADE, /* Medium source element empty */ + },{ + .sense = ILLEGAL_REQUEST, + .asc = 0x20, + .ascq = 0x00, + .errno = EBADRQC, /* Invalid command operation code */ + },{ + /* end of list */ + } +}; + +/* ------------------------------------------------------------------- */ + +static int ch_find_errno(unsigned char *sense_buffer) +{ + int i,errno = 0; + + /* Check to see if additional sense information is available */ + if (sense_buffer[7] > 5 && + sense_buffer[12] != 0) { + for (i = 0; err[i].errno != 0; i++) { + if (err[i].sense == sense_buffer[ 2] && + err[i].asc == sense_buffer[12] && + err[i].ascq == sense_buffer[13]) { + errno = -err[i].errno; + break; + } + } + } + if (errno == 0) + errno = -EIO; + return errno; +} + +static int +ch_do_scsi(scsi_changer *ch, unsigned char *cmd, + void *buffer, unsigned buflength, + enum dma_data_direction direction) +{ + int errno, retries = 0, timeout; + struct scsi_request *sr; + + sr = scsi_allocate_request(ch->device, GFP_KERNEL); + if (NULL == sr) + return -ENOMEM; + + timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS) + ? timeout_init : timeout_move; + + retry: + errno = 0; + if (debug) { + dprintk("command: "); + __scsi_print_command(cmd); + } + + scsi_wait_req(sr, cmd, buffer, buflength, + timeout * HZ, MAX_RETRIES); + + dprintk("result: 0x%x\n",sr->sr_result); + if (driver_byte(sr->sr_result) & DRIVER_SENSE) { + if (debug) + scsi_print_req_sense(ch->name, sr); + errno = ch_find_errno(sr->sr_sense_buffer); + + switch(sr->sr_sense_buffer[2] & 0xf) { + case UNIT_ATTENTION: + ch->unit_attention = 1; + if (retries++ < 3) + goto retry; + break; + } + } + scsi_release_request(sr); + return errno; +} + +/* ------------------------------------------------------------------------ */ + +static int +ch_elem_to_typecode(scsi_changer *ch, u_int elem) +{ + int i; + + for (i = 0; i < CH_TYPES; i++) { + if (elem >= ch->firsts[i] && + elem < ch->firsts[i] + + ch->counts[i]) + return i+1; + } + return 0; +} + +static int +ch_read_element_status(scsi_changer *ch, u_int elem, char *data) +{ + u_char cmd[12]; + u_char *buffer; + int result; + + buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); + if(!buffer) + return -ENOMEM; + + retry: + memset(cmd,0,sizeof(cmd)); + cmd[0] = READ_ELEMENT_STATUS; + cmd[1] = (ch->device->lun << 5) | + (ch->voltags ? 0x10 : 0) | + ch_elem_to_typecode(ch,elem); + cmd[2] = (elem >> 8) & 0xff; + cmd[3] = elem & 0xff; + cmd[5] = 1; + cmd[9] = 255; + if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) { + if (((buffer[16] << 8) | buffer[17]) != elem) { + dprintk("asked for element 0x%02x, got 0x%02x\n", + elem,(buffer[16] << 8) | buffer[17]); + kfree(buffer); + return -EIO; + } + memcpy(data,buffer+16,16); + } else { + if (ch->voltags) { + ch->voltags = 0; + vprintk("device has no volume tag support\n"); + goto retry; + } + dprintk("READ ELEMENT STATUS for element 0x%x failed\n",elem); + } + kfree(buffer); + return result; +} + +static int +ch_init_elem(scsi_changer *ch) +{ + int err; + u_char cmd[6]; + + vprintk("INITIALIZE ELEMENT STATUS, may take some time ...\n"); + memset(cmd,0,sizeof(cmd)); + cmd[0] = INITIALIZE_ELEMENT_STATUS; + cmd[1] = ch->device->lun << 5; + err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); + vprintk("... finished\n"); + return err; +} + +static int +ch_readconfig(scsi_changer *ch) +{ + u_char cmd[10], data[16]; + u_char *buffer; + int result,id,lun,i; + u_int elem; + + buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); + if (!buffer) + return -ENOMEM; + memset(buffer,0,512); + + memset(cmd,0,sizeof(cmd)); + cmd[0] = MODE_SENSE; + cmd[1] = ch->device->lun << 5; + cmd[2] = 0x1d; + cmd[4] = 255; + result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); + if (0 != result) { + cmd[1] |= (1<<3); + result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE); + } + if (0 == result) { + ch->firsts[CHET_MT] = + (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7]; + ch->counts[CHET_MT] = + (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9]; + ch->firsts[CHET_ST] = + (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11]; + ch->counts[CHET_ST] = + (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13]; + ch->firsts[CHET_IE] = + (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15]; + ch->counts[CHET_IE] = + (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17]; + ch->firsts[CHET_DT] = + (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19]; + ch->counts[CHET_DT] = + (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21]; + vprintk("type #1 (mt): 0x%x+%d [medium transport]\n", + ch->firsts[CHET_MT], + ch->counts[CHET_MT]); + vprintk("type #2 (st): 0x%x+%d [storage]\n", + ch->firsts[CHET_ST], + ch->counts[CHET_ST]); + vprintk("type #3 (ie): 0x%x+%d [import/export]\n", + ch->firsts[CHET_IE], + ch->counts[CHET_IE]); + vprintk("type #4 (dt): 0x%x+%d [data transfer]\n", + ch->firsts[CHET_DT], + ch->counts[CHET_DT]); + } else { + vprintk("reading element address assigment page failed!\n"); + } + + /* vendor specific element types */ + for (i = 0; i < 4; i++) { + if (0 == vendor_counts[i]) + continue; + if (NULL == vendor_labels[i]) + continue; + ch->firsts[CHET_V1+i] = vendor_firsts[i]; + ch->counts[CHET_V1+i] = vendor_counts[i]; + vprintk("type #%d (v%d): 0x%x+%d [%s, vendor specific]\n", + i+5,i+1,vendor_firsts[i],vendor_counts[i], + vendor_labels[i]); + } + + /* look up the devices of the data transfer elements */ + ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device), + GFP_KERNEL); + for (elem = 0; elem < ch->counts[CHET_DT]; elem++) { + id = -1; + lun = 0; + if (elem < CH_DT_MAX && -1 != dt_id[elem]) { + id = dt_id[elem]; + lun = dt_lun[elem]; + vprintk("dt 0x%x: [insmod option] ", + elem+ch->firsts[CHET_DT]); + } else if (0 != ch_read_element_status + (ch,elem+ch->firsts[CHET_DT],data)) { + vprintk("dt 0x%x: READ ELEMENT STATUS failed\n", + elem+ch->firsts[CHET_DT]); + } else { + vprintk("dt 0x%x: ",elem+ch->firsts[CHET_DT]); + if (data[6] & 0x80) { + if (verbose) + printk("not this SCSI bus\n"); + ch->dt[elem] = NULL; + } else if (0 == (data[6] & 0x30)) { + if (verbose) + printk("ID/LUN unknown\n"); + ch->dt[elem] = NULL; + } else { + id = ch->device->id; + lun = 0; + if (data[6] & 0x20) id = data[7]; + if (data[6] & 0x10) lun = data[6] & 7; + } + } + if (-1 != id) { + if (verbose) + printk("ID %i, LUN %i, ",id,lun); + ch->dt[elem] = + scsi_device_lookup(ch->device->host, + ch->device->channel, + id,lun); + if (!ch->dt[elem]) { + /* should not happen */ + if (verbose) + printk("Huh? device not found!\n"); + } else { + if (verbose) + printk("name: %8.8s %16.16s %4.4s\n", + ch->dt[elem]->vendor, + ch->dt[elem]->model, + ch->dt[elem]->rev); + } + } + } + ch->voltags = 1; + kfree(buffer); + + return 0; +} + +/* ------------------------------------------------------------------------ */ + +static int +ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate) +{ + u_char cmd[10]; + + dprintk("position: 0x%x\n",elem); + if (0 == trans) + trans = ch->firsts[CHET_MT]; + memset(cmd,0,sizeof(cmd)); + cmd[0] = POSITION_TO_ELEMENT; + cmd[1] = ch->device->lun << 5; + cmd[2] = (trans >> 8) & 0xff; + cmd[3] = trans & 0xff; + cmd[4] = (elem >> 8) & 0xff; + cmd[5] = elem & 0xff; + cmd[8] = rotate ? 1 : 0; + return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE); +} + +static int +ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate) +{ + u_char cmd[12]; + + dprintk("move: 0x%x => 0x%x\n",src,dest); + if (0 == trans) + trans = ch->firsts[CHET_MT]; + memset(cmd,0,sizeof(cmd)); + cmd[0] = MOVE_MEDIUM; + cmd[1] = ch->device->lun << 5; + cmd[2] = (trans >> 8) & 0xff; + cmd[3] = trans & 0xff; + cmd[4] = (src >> 8) & 0xff; + cmd[5] = src & 0xff; + cmd[6] = (dest >> 8) & 0xff; + cmd[7] = dest & 0xff; + cmd[10] = rotate ? 1 : 0; + return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); +} + +static int +ch_exchange(scsi_changer *ch, u_int trans, u_int src, + u_int dest1, u_int dest2, int rotate1, int rotate2) +{ + u_char cmd[12]; + + dprintk("exchange: 0x%x => 0x%x => 0x%x\n", + src,dest1,dest2); + if (0 == trans) + trans = ch->firsts[CHET_MT]; + memset(cmd,0,sizeof(cmd)); + cmd[0] = EXCHANGE_MEDIUM; + cmd[1] = ch->device->lun << 5; + cmd[2] = (trans >> 8) & 0xff; + cmd[3] = trans & 0xff; + cmd[4] = (src >> 8) & 0xff; + cmd[5] = src & 0xff; + cmd[6] = (dest1 >> 8) & 0xff; + cmd[7] = dest1 & 0xff; + cmd[8] = (dest2 >> 8) & 0xff; + cmd[9] = dest2 & 0xff; + cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0); + + return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE); +} + +static void +ch_check_voltag(char *tag) +{ + int i; + + for (i = 0; i < 32; i++) { + /* restrict to ascii */ + if (tag[i] >= 0x7f || tag[i] < 0x20) + tag[i] = ' '; + /* don't allow search wildcards */ + if (tag[i] == '?' || + tag[i] == '*') + tag[i] = ' '; + } +} + +static int +ch_set_voltag(scsi_changer *ch, u_int elem, + int alternate, int clear, u_char *tag) +{ + u_char cmd[12]; + u_char *buffer; + int result; + + buffer = kmalloc(512, GFP_KERNEL); + if (!buffer) + return -ENOMEM; + memset(buffer,0,512); + + dprintk("%s %s voltag: 0x%x => \"%s\"\n", + clear ? "clear" : "set", + alternate ? "alternate" : "primary", + elem, tag); + memset(cmd,0,sizeof(cmd)); + cmd[0] = SEND_VOLUME_TAG; + cmd[1] = (ch->device->lun << 5) | + ch_elem_to_typecode(ch,elem); + cmd[2] = (elem >> 8) & 0xff; + cmd[3] = elem & 0xff; + cmd[5] = clear + ? (alternate ? 0x0d : 0x0c) + : (alternate ? 0x0b : 0x0a); + + cmd[9] = 255; + + memcpy(buffer,tag,32); + ch_check_voltag(buffer); + + result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE); + kfree(buffer); + return result; +} + +static int ch_gstatus(scsi_changer *ch, int type, unsigned char *dest) +{ + int retval = 0; + u_char data[16]; + unsigned int i; + + down(&ch->lock); + for (i = 0; i < ch->counts[type]; i++) { + if (0 != ch_read_element_status + (ch, ch->firsts[type]+i,data)) { + retval = -EIO; + break; + } + put_user(data[2], dest+i); + if (data[2] & CESTATUS_EXCEPT) + vprintk("element 0x%x: asc=0x%x, ascq=0x%x\n", + ch->firsts[type]+i, + (int)data[4],(int)data[5]); + retval = ch_read_element_status + (ch, ch->firsts[type]+i,data); + if (0 != retval) + break; + } + up(&ch->lock); + return retval; +} + +/* ------------------------------------------------------------------------ */ + +static int +ch_release(struct inode *inode, struct file *file) +{ + scsi_changer *ch = file->private_data; + + scsi_device_put(ch->device); + file->private_data = NULL; + return 0; +} + +static int +ch_open(struct inode *inode, struct file *file) +{ + scsi_changer *tmp, *ch; + int minor = iminor(inode); + + spin_lock(&ch_devlist_lock); + ch = NULL; + list_for_each_entry(tmp,&ch_devlist,list) { + if (tmp->minor == minor) + ch = tmp; + } + if (NULL == ch || scsi_device_get(ch->device)) { + spin_unlock(&ch_devlist_lock); + return -ENXIO; + } + spin_unlock(&ch_devlist_lock); + + file->private_data = ch; + return 0; +} + +static int +ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit) +{ + if (type >= CH_TYPES || unit >= ch->counts[type]) + return -1; + return 0; +} + +static int ch_ioctl(struct inode * inode, struct file * file, + unsigned int cmd, unsigned long arg) +{ + scsi_changer *ch = file->private_data; + int retval; + + switch (cmd) { + case CHIOGPARAMS: + { + struct changer_params params; + + params.cp_curpicker = 0; + params.cp_npickers = ch->counts[CHET_MT]; + params.cp_nslots = ch->counts[CHET_ST]; + params.cp_nportals = ch->counts[CHET_IE]; + params.cp_ndrives = ch->counts[CHET_DT]; + + if (copy_to_user((void *) arg, ¶ms, sizeof(params))) + return -EFAULT; + return 0; + } + case CHIOGVPARAMS: + { + struct changer_vendor_params vparams; + + memset(&vparams,0,sizeof(vparams)); + if (ch->counts[CHET_V1]) { + vparams.cvp_n1 = ch->counts[CHET_V1]; + strncpy(vparams.cvp_label1,vendor_labels[0],16); + } + if (ch->counts[CHET_V2]) { + vparams.cvp_n2 = ch->counts[CHET_V2]; + strncpy(vparams.cvp_label2,vendor_labels[1],16); + } + if (ch->counts[CHET_V3]) { + vparams.cvp_n3 = ch->counts[CHET_V3]; + strncpy(vparams.cvp_label3,vendor_labels[2],16); + } + if (ch->counts[CHET_V4]) { + vparams.cvp_n4 = ch->counts[CHET_V4]; + strncpy(vparams.cvp_label4,vendor_labels[3],16); + } + if (copy_to_user((void *) arg, &vparams, sizeof(vparams))) + return -EFAULT; + return 0; + } + + case CHIOPOSITION: + { + struct changer_position pos; + + if (copy_from_user(&pos, (void*)arg, sizeof (pos))) + return -EFAULT; + + if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) { + dprintk("CHIOPOSITION: invalid parameter\n"); + return -EBADSLT; + } + down(&ch->lock); + retval = ch_position(ch,0, + ch->firsts[pos.cp_type] + pos.cp_unit, + pos.cp_flags & CP_INVERT); + up(&ch->lock); + return retval; + } + + case CHIOMOVE: + { + struct changer_move mv; + + if (copy_from_user(&mv, (void*)arg, sizeof (mv))) + return -EFAULT; + + if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) || + 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) { + dprintk("CHIOMOVE: invalid parameter\n"); + return -EBADSLT; + } + + down(&ch->lock); + retval = ch_move(ch,0, + ch->firsts[mv.cm_fromtype] + mv.cm_fromunit, + ch->firsts[mv.cm_totype] + mv.cm_tounit, + mv.cm_flags & CM_INVERT); + up(&ch->lock); + return retval; + } + + case CHIOEXCHANGE: + { + struct changer_exchange mv; + + if (copy_from_user(&mv, (void*)arg, sizeof (mv))) + return -EFAULT; + + if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) || + 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) || + 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) { + dprintk("CHIOEXCHANGE: invalid parameter\n"); + return -EBADSLT; + } + + down(&ch->lock); + retval = ch_exchange + (ch,0, + ch->firsts[mv.ce_srctype] + mv.ce_srcunit, + ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit, + ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit, + mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2); + up(&ch->lock); + return retval; + } + + case CHIOGSTATUS: + { + struct changer_element_status ces; + + if (copy_from_user(&ces, (void*)arg, sizeof (ces))) + return -EFAULT; + if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES) + return -EINVAL; + + return ch_gstatus(ch, ces.ces_type, ces.ces_data); + } + + case CHIOGELEM: + { + struct changer_get_element cge; + u_char cmd[12]; + u_char *buffer; + unsigned int elem; + int result,i; + + if (copy_from_user(&cge, (void*)arg, sizeof (cge))) + return -EFAULT; + + if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit)) + return -EINVAL; + elem = ch->firsts[cge.cge_type] + cge.cge_unit; + + buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); + if (!buffer) + return -ENOMEM; + down(&ch->lock); + + voltag_retry: + memset(cmd,0,sizeof(cmd)); + cmd[0] = READ_ELEMENT_STATUS; + cmd[1] = (ch->device->lun << 5) | + (ch->voltags ? 0x10 : 0) | + ch_elem_to_typecode(ch,elem); + cmd[2] = (elem >> 8) & 0xff; + cmd[3] = elem & 0xff; + cmd[5] = 1; + cmd[9] = 255; + + if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) { + cge.cge_status = buffer[18]; + cge.cge_flags = 0; + if (buffer[18] & CESTATUS_EXCEPT) { + cge.cge_errno = EIO; + } + if (buffer[25] & 0x80) { + cge.cge_flags |= CGE_SRC; + if (buffer[25] & 0x40) + cge.cge_flags |= CGE_INVERT; + elem = (buffer[26]<<8) | buffer[27]; + for (i = 0; i < 4; i++) { + if (elem >= ch->firsts[i] && + elem < ch->firsts[i] + ch->counts[i]) { + cge.cge_srctype = i; + cge.cge_srcunit = elem-ch->firsts[i]; + } + } + } + if ((buffer[22] & 0x30) == 0x30) { + cge.cge_flags |= CGE_IDLUN; + cge.cge_id = buffer[23]; + cge.cge_lun = buffer[22] & 7; + } + if (buffer[9] & 0x80) { + cge.cge_flags |= CGE_PVOLTAG; + memcpy(cge.cge_pvoltag,buffer+28,36); + } + if (buffer[9] & 0x40) { + cge.cge_flags |= CGE_AVOLTAG; + memcpy(cge.cge_avoltag,buffer+64,36); + } + } else if (ch->voltags) { + ch->voltags = 0; + vprintk("device has no volume tag support\n"); + goto voltag_retry; + } + kfree(buffer); + up(&ch->lock); + + if (copy_to_user((void*)arg, &cge, sizeof (cge))) + return -EFAULT; + return result; + } + + case CHIOINITELEM: + { + down(&ch->lock); + retval = ch_init_elem(ch); + up(&ch->lock); + return retval; + } + + case CHIOSVOLTAG: + { + struct changer_set_voltag csv; + int elem; + + if (copy_from_user(&csv, (void*)arg, sizeof(csv))) + return -EFAULT; + + if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) { + dprintk("CHIOSVOLTAG: invalid parameter\n"); + return -EBADSLT; + } + elem = ch->firsts[csv.csv_type] + csv.csv_unit; + down(&ch->lock); + retval = ch_set_voltag(ch, elem, + csv.csv_flags & CSV_AVOLTAG, + csv.csv_flags & CSV_CLEARTAG, + csv.csv_voltag); + up(&ch->lock); + return retval; + } + + default: + return scsi_ioctl(ch->device, cmd, (void*)arg); + + } +} + +#ifdef CONFIG_COMPAT + +struct changer_element_status32 { + int ces_type; + compat_uptr_t ces_data; +}; +#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32) + +static long ch_ioctl_compat(struct file * file, + unsigned int cmd, unsigned long arg) +{ + scsi_changer *ch = file->private_data; + + switch (cmd) { + case CHIOGPARAMS: + case CHIOGVPARAMS: + case CHIOPOSITION: + case CHIOMOVE: + case CHIOEXCHANGE: + case CHIOGELEM: + case CHIOINITELEM: + case CHIOSVOLTAG: + /* compatible */ + return ch_ioctl(NULL /* inode, unused */, + file, cmd, arg); + case CHIOGSTATUS32: + { + struct changer_element_status32 ces32; + unsigned char *data; + + if (copy_from_user(&ces32, (void*)arg, sizeof (ces32))) + return -EFAULT; + if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES) + return -EINVAL; + + data = compat_ptr(ces32.ces_data); + return ch_gstatus(ch, ces32.ces_type, data); + } + default: + // return scsi_ioctl_compat(ch->device, cmd, (void*)arg); + return -ENOIOCTLCMD; + + } +} +#endif + +/* ------------------------------------------------------------------------ */ + +static int ch_probe(struct device *dev) +{ + struct scsi_device *sd = to_scsi_device(dev); + scsi_changer *ch; + + if (sd->type != TYPE_MEDIUM_CHANGER) + return -ENODEV; + + ch = kmalloc(sizeof(*ch), GFP_KERNEL); + if (NULL == ch) + return -ENOMEM; + + memset(ch,0,sizeof(*ch)); + ch->minor = ch_devcount; + sprintf(ch->name,"ch%d",ch->minor); + init_MUTEX(&ch->lock); + ch->device = sd; + ch_readconfig(ch); + if (init) + ch_init_elem(ch); + + devfs_mk_cdev(MKDEV(SCSI_CHANGER_MAJOR,ch->minor), + S_IFCHR | S_IRUGO | S_IWUGO, ch->name); + class_simple_device_add(ch_sysfs_class, + MKDEV(SCSI_CHANGER_MAJOR,ch->minor), + dev, "s%s", ch->name); + + printk(KERN_INFO "Attached scsi changer %s " + "at scsi%d, channel %d, id %d, lun %d\n", + ch->name, sd->host->host_no, sd->channel, sd->id, sd->lun); + + spin_lock(&ch_devlist_lock); + list_add_tail(&ch->list,&ch_devlist); + ch_devcount++; + spin_unlock(&ch_devlist_lock); + return 0; +} + +static int ch_remove(struct device *dev) +{ + struct scsi_device *sd = to_scsi_device(dev); + scsi_changer *tmp, *ch; + + spin_lock(&ch_devlist_lock); + ch = NULL; + list_for_each_entry(tmp,&ch_devlist,list) { + if (tmp->device == sd) + ch = tmp; + } + BUG_ON(NULL == ch); + list_del(&ch->list); + spin_unlock(&ch_devlist_lock); + + class_simple_device_remove(MKDEV(SCSI_CHANGER_MAJOR,ch->minor)); + devfs_remove(ch->name); + kfree(ch->dt); + kfree(ch); + ch_devcount--; + return 0; +} + +static int __init init_ch_module(void) +{ + int rc; + + printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n"); + ch_sysfs_class = class_simple_create(THIS_MODULE, "scsi_changer"); + if (IS_ERR(ch_sysfs_class)) { + rc = PTR_ERR(ch_sysfs_class); + return rc; + } + rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops); + if (rc < 0) { + printk("Unable to get major %d for SCSI-Changer\n", + SCSI_CHANGER_MAJOR); + goto fail1; + } + rc = scsi_register_driver(&ch_template.gendrv); + if (rc < 0) + goto fail2; + return 0; + + fail2: + unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); + fail1: + class_simple_destroy(ch_sysfs_class); + return rc; +} + +static void __exit exit_ch_module(void) +{ + scsi_unregister_driver(&ch_template.gendrv); + unregister_chrdev(SCSI_CHANGER_MAJOR, "ch"); + class_simple_destroy(ch_sysfs_class); +} + +module_init(init_ch_module); +module_exit(exit_ch_module); + +/* + * Local variables: + * c-basic-offset: 8 + * End: + */ diff --git a/include/linux/chio.h b/include/linux/chio.h new file mode 100644 index 0000000..63035ae --- /dev/null +++ b/include/linux/chio.h @@ -0,0 +1,168 @@ +/* + * ioctl interface for the scsi media changer driver + */ + +/* changer element types */ +#define CHET_MT 0 /* media transport element (robot) */ +#define CHET_ST 1 /* storage element (media slots) */ +#define CHET_IE 2 /* import/export element */ +#define CHET_DT 3 /* data transfer element (tape/cdrom/whatever) */ +#define CHET_V1 4 /* vendor specific #1 */ +#define CHET_V2 5 /* vendor specific #2 */ +#define CHET_V3 6 /* vendor specific #3 */ +#define CHET_V4 7 /* vendor specific #4 */ + + +/* + * CHIOGPARAMS + * query changer properties + * + * CHIOVGPARAMS + * query vendor-specific element types + * + * accessing elements works by specifing type and unit of the element. + * for eample, storage elements are addressed with type = CHET_ST and + * unit = 0 .. cp_nslots-1 + * + */ +struct changer_params { + int cp_curpicker; /* current transport element */ + int cp_npickers; /* number of transport elements (CHET_MT) */ + int cp_nslots; /* number of storage elements (CHET_ST) */ + int cp_nportals; /* number of import/export elements (CHET_IE) */ + int cp_ndrives; /* number of data transfer elements (CHET_DT) */ +}; +struct changer_vendor_params { + int cvp_n1; /* number of vendor specific elems (CHET_V1) */ + char cvp_label1[16]; + int cvp_n2; /* number of vendor specific elems (CHET_V2) */ + char cvp_label2[16]; + int cvp_n3; /* number of vendor specific elems (CHET_V3) */ + char cvp_label3[16]; + int cvp_n4; /* number of vendor specific elems (CHET_V4) */ + char cvp_label4[16]; + int reserved[8]; +}; + + +/* + * CHIOMOVE + * move a medium from one element to another + */ +struct changer_move { + int cm_fromtype; /* type/unit of source element */ + int cm_fromunit; + int cm_totype; /* type/unit of destination element */ + int cm_tounit; + int cm_flags; +}; +#define CM_INVERT 1 /* flag: rotate media (for double-sided like MOD) */ + + +/* + * CHIOEXCHANGE + * move one medium from element #1 to element #2, + * and another one from element #2 to element #3. + * element #1 and #3 are allowed to be identical. + */ +struct changer_exchange { + int ce_srctype; /* type/unit of element #1 */ + int ce_srcunit; + int ce_fdsttype; /* type/unit of element #2 */ + int ce_fdstunit; + int ce_sdsttype; /* type/unit of element #3 */ + int ce_sdstunit; + int ce_flags; +}; +#define CE_INVERT1 1 +#define CE_INVERT2 2 + + +/* + * CHIOPOSITION + * move the transport element (robot arm) to a specific element. + */ +struct changer_position { + int cp_type; + int cp_unit; + int cp_flags; +}; +#define CP_INVERT 1 + + +/* + * CHIOGSTATUS + * get element status for all elements of a specific type + */ +struct changer_element_status { + int ces_type; + unsigned char *ces_data; +}; +#define CESTATUS_FULL 0x01 /* full */ +#define CESTATUS_IMPEXP 0x02 /* media was imported (inserted by sysop) */ +#define CESTATUS_EXCEPT 0x04 /* error condition */ +#define CESTATUS_ACCESS 0x08 /* access allowed */ +#define CESTATUS_EXENAB 0x10 /* element can export media */ +#define CESTATUS_INENAB 0x20 /* element can import media */ + + +/* + * CHIOGELEM + * get more detailed status informtion for a single element + */ +struct changer_get_element { + int cge_type; /* type/unit */ + int cge_unit; + int cge_status; /* status */ + int cge_errno; /* errno */ + int cge_srctype; /* source element of the last move/exchange */ + int cge_srcunit; + int cge_id; /* scsi id (for data transfer elements) */ + int cge_lun; /* scsi lun (for data transfer elements) */ + char cge_pvoltag[36]; /* primary volume tag */ + char cge_avoltag[36]; /* alternate volume tag */ + int cge_flags; +}; +/* flags */ +#define CGE_ERRNO 0x01 /* errno available */ +#define CGE_INVERT 0x02 /* media inverted */ +#define CGE_SRC 0x04 /* media src available */ +#define CGE_IDLUN 0x08 /* ID+LUN available */ +#define CGE_PVOLTAG 0x10 /* primary volume tag available */ +#define CGE_AVOLTAG 0x20 /* alternate volume tag available */ + + +/* + * CHIOSVOLTAG + * set volume tag + */ +struct changer_set_voltag { + int csv_type; /* type/unit */ + int csv_unit; + char csv_voltag[36]; /* volume tag */ + int csv_flags; +}; +#define CSV_PVOLTAG 0x01 /* primary volume tag */ +#define CSV_AVOLTAG 0x02 /* alternate volume tag */ +#define CSV_CLEARTAG 0x04 /* clear volume tag */ + +/* ioctls */ +#define CHIOMOVE _IOW('c', 1,struct changer_move) +#define CHIOEXCHANGE _IOW('c', 2,struct changer_exchange) +#define CHIOPOSITION _IOW('c', 3,struct changer_position) +#define CHIOGPICKER _IOR('c', 4,int) /* not impl. */ +#define CHIOSPICKER _IOW('c', 5,int) /* not impl. */ +#define CHIOGPARAMS _IOR('c', 6,struct changer_params) +#define CHIOGSTATUS _IOW('c', 8,struct changer_element_status) +#define CHIOGELEM _IOW('c',16,struct changer_get_element) +#define CHIOINITELEM _IO('c',17) +#define CHIOSVOLTAG _IOW('c',18,struct changer_set_voltag) +#define CHIOGVPARAMS _IOR('c',19,struct changer_vendor_params) + +/* ---------------------------------------------------------------------- */ + +/* + * Local variables: + * c-basic-offset: 8 + * End: + */ diff --git a/include/linux/major.h b/include/linux/major.h index 4b62c42..e36a467 100644 --- a/include/linux/major.h +++ b/include/linux/major.h @@ -100,6 +100,7 @@ #define I2O_MAJOR 80 /* 80->87 */ #define SHMIQ_MAJOR 85 /* Linux/mips, SGI /dev/shmiq */ +#define SCSI_CHANGER_MAJOR 86 #define IDE6_MAJOR 88 #define IDE7_MAJOR 89 diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h index 659ecf48..ca1e3b4a 100644 --- a/include/scsi/scsi.h +++ b/include/scsi/scsi.h @@ -41,6 +41,7 @@ extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE]; #define FORMAT_UNIT 0x04 #define READ_BLOCK_LIMITS 0x05 #define REASSIGN_BLOCKS 0x07 +#define INITIALIZE_ELEMENT_STATUS 0x07 #define READ_6 0x08 #define WRITE_6 0x0a #define SEEK_6 0x0b @@ -65,6 +66,7 @@ extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE]; #define READ_10 0x28 #define WRITE_10 0x2a #define SEEK_10 0x2b +#define POSITION_TO_ELEMENT 0x2b #define WRITE_VERIFY 0x2e #define VERIFY 0x2f #define SEARCH_HIGH 0x30 @@ -97,6 +99,7 @@ extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE]; #define PERSISTENT_RESERVE_OUT 0x5f #define REPORT_LUNS 0xa0 #define MOVE_MEDIUM 0xa5 +#define EXCHANGE_MEDIUM 0xa6 #define READ_12 0xa8 #define WRITE_12 0xaa #define WRITE_VERIFY_12 0xae |
