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authorJames Bottomley <James.Bottomley@steeleye.com>2005-05-24 16:57:31 -0500
committerJames Bottomley <jejb@mulgrave.(none)>2005-05-26 11:49:20 -0400
commitc3e9dda4f5702ee5b346f4770de53f79e8ad1d8d (patch)
treee9925c556434a7f029678b2e3aa102b845d27c5d /include/scsi/scsi_transport.h
parent644e02ea147f8bea18800107f443ea5fa7f17f4f (diff)
downloadlinux-linaro-stable-c3e9dda4f5702ee5b346f4770de53f79e8ad1d8d.tar.gz
[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>
Diffstat (limited to 'include/scsi/scsi_transport.h')
-rw-r--r--include/scsi/scsi_transport.h38
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 @@
#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 */