diff options
| author | James Bottomley <James.Bottomley@steeleye.com> | 2005-05-24 16:57:31 -0500 |
|---|---|---|
| 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 2dcee7a8475..a4f1837a33b 100644 --- a/include/scsi/scsi_transport.h +++ b/include/scsi/scsi_transport.h @@ -21,6 +21,7 @@ #define SCSI_TRANSPORT_H #include <linux/transport_class.h> +#include <scsi/scsi_host.h> struct scsi_transport_template { /* the attribute containers */ @@ -32,8 +33,11 @@ struct scsi_transport_template { * space of this size will be left at the end of the * scsi_* structure */ int device_size; + int device_private_offset; int target_size; + int target_private_offset; int host_size; + /* no private offset for the host; there's an alternative mechanism */ /* * True if the transport wants to use a host-based work-queue @@ -45,4 +49,38 @@ struct scsi_transport_template { dev_to_shost((tc)->dev) +/* Private area maintenance. The driver requested allocations come + * directly after the transport class allocations (if any). The idea + * is that you *must* call these only once. The code assumes that the + * initial values are the ones the transport specific code requires */ +static inline void +scsi_transport_reserve_target(struct scsi_transport_template * t, int space) +{ + BUG_ON(t->target_private_offset != 0); + t->target_private_offset = ALIGN(t->target_size, sizeof(void *)); + t->target_size = t->target_private_offset + space; +} +static inline void +scsi_transport_reserve_device(struct scsi_transport_template * t, int space) +{ + BUG_ON(t->device_private_offset != 0); + t->device_private_offset = ALIGN(t->device_size, sizeof(void *)); + t->device_size = t->device_private_offset + space; +} +static inline void * +scsi_transport_target_data(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(&starget->dev); + return (u8 *)starget->starget_data + + shost->transportt->target_private_offset; + +} +static inline void * +scsi_transport_device_data(struct scsi_device *sdev) +{ + struct Scsi_Host *shost = sdev->host; + return (u8 *)sdev->sdev_data + + shost->transportt->device_private_offset; +} + #endif /* SCSI_TRANSPORT_H */ |