diff options
author | James Bottomley <James.Bottomley@steeleye.com> | 2005-05-24 17:57:31 -0400 |
---|---|---|
committer | James Bottomley <jejb@mulgrave.(none)> | 2005-05-26 11:49:20 -0400 |
commit | c3e9dda4f5702ee5b346f4770de53f79e8ad1d8d (patch) | |
tree | e9925c556434a7f029678b2e3aa102b845d27c5d | |
parent | 644e02ea147f8bea18800107f443ea5fa7f17f4f (diff) |
[SCSI] allow the HBA to reserve target and device private areas
This patch basically allows any HBA attached to the SPI transport class
to declare an extra area which the mid-layer will allocate as part of
its device and target allocations.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r-- | include/scsi/scsi_transport.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h index 2dcee7a84752..a4f1837a33b1 100644 --- a/include/scsi/scsi_transport.h +++ b/include/scsi/scsi_transport.h | |||
@@ -21,6 +21,7 @@ | |||
21 | #define SCSI_TRANSPORT_H | 21 | #define SCSI_TRANSPORT_H |
22 | 22 | ||
23 | #include <linux/transport_class.h> | 23 | #include <linux/transport_class.h> |
24 | #include <scsi/scsi_host.h> | ||
24 | 25 | ||
25 | struct scsi_transport_template { | 26 | struct scsi_transport_template { |
26 | /* the attribute containers */ | 27 | /* the attribute containers */ |
@@ -32,8 +33,11 @@ struct scsi_transport_template { | |||
32 | * space of this size will be left at the end of the | 33 | * space of this size will be left at the end of the |
33 | * scsi_* structure */ | 34 | * scsi_* structure */ |
34 | int device_size; | 35 | int device_size; |
36 | int device_private_offset; | ||
35 | int target_size; | 37 | int target_size; |
38 | int target_private_offset; | ||
36 | int host_size; | 39 | int host_size; |
40 | /* no private offset for the host; there's an alternative mechanism */ | ||
37 | 41 | ||
38 | /* | 42 | /* |
39 | * True if the transport wants to use a host-based work-queue | 43 | * True if the transport wants to use a host-based work-queue |
@@ -45,4 +49,38 @@ struct scsi_transport_template { | |||
45 | dev_to_shost((tc)->dev) | 49 | dev_to_shost((tc)->dev) |
46 | 50 | ||
47 | 51 | ||
52 | /* Private area maintenance. The driver requested allocations come | ||
53 | * directly after the transport class allocations (if any). The idea | ||
54 | * is that you *must* call these only once. The code assumes that the | ||
55 | * initial values are the ones the transport specific code requires */ | ||
56 | static inline void | ||
57 | scsi_transport_reserve_target(struct scsi_transport_template * t, int space) | ||
58 | { | ||
59 | BUG_ON(t->target_private_offset != 0); | ||
60 | t->target_private_offset = ALIGN(t->target_size, sizeof(void *)); | ||
61 | t->target_size = t->target_private_offset + space; | ||
62 | } | ||
63 | static inline void | ||
64 | scsi_transport_reserve_device(struct scsi_transport_template * t, int space) | ||
65 | { | ||
66 | BUG_ON(t->device_private_offset != 0); | ||
67 | t->device_private_offset = ALIGN(t->device_size, sizeof(void *)); | ||
68 | t->device_size = t->device_private_offset + space; | ||
69 | } | ||
70 | static inline void * | ||
71 | scsi_transport_target_data(struct scsi_target *starget) | ||
72 | { | ||
73 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | ||
74 | return (u8 *)starget->starget_data | ||
75 | + shost->transportt->target_private_offset; | ||
76 | |||
77 | } | ||
78 | static inline void * | ||
79 | scsi_transport_device_data(struct scsi_device *sdev) | ||
80 | { | ||
81 | struct Scsi_Host *shost = sdev->host; | ||
82 | return (u8 *)sdev->sdev_data | ||
83 | + shost->transportt->device_private_offset; | ||
84 | } | ||
85 | |||
48 | #endif /* SCSI_TRANSPORT_H */ | 86 | #endif /* SCSI_TRANSPORT_H */ |