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1da177e4 | 1 | /* |
bd4f36d6 MM |
2 | * Disk Array driver for HP Smart Array controllers, SCSI Tape module. |
3 | * (C) Copyright 2001, 2007 Hewlett-Packard Development Company, L.P. | |
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4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
bd4f36d6 | 7 | * the Free Software Foundation; version 2 of the License. |
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8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
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11 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * General Public License for more details. | |
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13 | * |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
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16 | * Foundation, Inc., 59 Temple Place, Suite 300, Boston, MA |
17 | * 02111-1307, USA. | |
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18 | * |
19 | * Questions/Comments/Bugfixes to iss_storagedev@hp.com | |
20 | * | |
21 | */ | |
22 | #ifdef CONFIG_CISS_SCSI_TAPE | |
23 | #ifndef _CCISS_SCSI_H_ | |
24 | #define _CCISS_SCSI_H_ | |
25 | ||
26 | #include <scsi/scsicam.h> /* possibly irrelevant, since we don't show disks */ | |
27 | ||
b028461d | 28 | /* the scsi id of the adapter... */ |
1da177e4 | 29 | #define SELF_SCSI_ID 15 |
b028461d | 30 | /* 15 is somewhat arbitrary, since the scsi-2 bus |
31 | that's presented by the driver to the OS is | |
32 | fabricated. The "real" scsi-3 bus the | |
33 | hardware presents is fabricated too. | |
34 | The actual, honest-to-goodness physical | |
35 | bus that the devices are attached to is not | |
36 | addressible natively, and may in fact turn | |
37 | out to be not scsi at all. */ | |
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38 | |
39 | #define SCSI_CCISS_CAN_QUEUE 2 | |
40 | ||
41 | /* | |
42 | ||
43 | Note, cmd_per_lun could give us some trouble, so I'm setting it very low. | |
44 | Likewise, SCSI_CCISS_CAN_QUEUE is set very conservatively. | |
45 | ||
46 | If the upper scsi layer tries to track how many commands we have | |
47 | outstanding, it will be operating under the misapprehension that it is | |
48 | the only one sending us requests. We also have the block interface, | |
49 | which is where most requests must surely come from, so the upper layer's | |
50 | notion of how many requests we have outstanding will be wrong most or | |
51 | all of the time. | |
52 | ||
53 | Note, the normal SCSI mid-layer error handling doesn't work well | |
54 | for this driver because 1) it takes the io_request_lock before | |
55 | calling error handlers and uses a local variable to store flags, | |
56 | so the io_request_lock cannot be released and interrupts enabled | |
57 | inside the error handlers, and, the error handlers cannot poll | |
58 | for command completion because they might get commands from the | |
59 | block half of the driver completing, and not know what to do | |
60 | with them. That's what we get for making a hybrid scsi/block | |
61 | driver, I suppose. | |
62 | ||
63 | */ | |
64 | ||
65 | struct cciss_scsi_dev_t { | |
66 | int devtype; | |
67 | int bus, target, lun; /* as presented to the OS */ | |
68 | unsigned char scsi3addr[8]; /* as presented to the HW */ | |
905bd78f | 69 | unsigned char device_id[16]; /* from inquiry pg. 0x83 */ |
70 | unsigned char vendor[8]; /* bytes 8-15 of inquiry data */ | |
71 | unsigned char model[16]; /* bytes 16-31 of inquiry data */ | |
72 | unsigned char revision[4]; /* bytes 32-35 of inquiry data */ | |
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73 | }; |
74 | ||
75 | struct cciss_scsi_hba_t { | |
76 | char *name; | |
77 | int ndevices; | |
78 | #define CCISS_MAX_SCSI_DEVS_PER_HBA 16 | |
79 | struct cciss_scsi_dev_t dev[CCISS_MAX_SCSI_DEVS_PER_HBA]; | |
80 | }; | |
81 | ||
82 | #endif /* _CCISS_SCSI_H_ */ | |
83 | #endif /* CONFIG_CISS_SCSI_TAPE */ |