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authorStephen M. Cameron <scameron@beardog.cce.hp.com>2010-02-25 21:03:27 +0100
committerJames Bottomley <James.Bottomley@suse.de>2010-03-03 14:07:22 +0100
commit33a2ffce51d9598380d73c515a27fc6cff3bd9c4 (patch)
treec370a96166c005f82c44353f4098778e85db0f72 /drivers/scsi/hpsa_cmd.h
parent[SCSI] hpsa: Clarify calculation of padding for commandlist structure (diff)
downloadlinux-33a2ffce51d9598380d73c515a27fc6cff3bd9c4.tar.xz
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[SCSI] hpsa: Increase the number of scatter gather elements supported.
This uses the scatter-gather chaining feature of Smart Array controllers. 32 scatter-gather elements are embedded in the "command list", and the last element in the list may be marked as a "chain pointer", and point to an additional block of scatter gather elements. The precise number of scatter gather elements supported is dependent on the particular kind of Smart Array, and is determined at runtime by querying the hardware. Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to '')
-rw-r--r--drivers/scsi/hpsa_cmd.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
index 43b6f1cffe34..cb0c2385f3f6 100644
--- a/drivers/scsi/hpsa_cmd.h
+++ b/drivers/scsi/hpsa_cmd.h
@@ -23,7 +23,8 @@
/* general boundary defintions */
#define SENSEINFOBYTES 32 /* may vary between hbas */
-#define MAXSGENTRIES 31
+#define MAXSGENTRIES 32
+#define HPSA_SG_CHAIN 0x80000000
#define MAXREPLYQS 256
/* Command Status value */
@@ -321,8 +322,8 @@ struct CommandList {
*/
#define IS_32_BIT ((8 - sizeof(long))/4)
#define IS_64_BIT (!IS_32_BIT)
-#define PAD_32 (8)
-#define PAD_64 (0)
+#define PAD_32 (24)
+#define PAD_64 (16)
#define COMMANDLIST_PAD (IS_32_BIT * PAD_32 + IS_64_BIT * PAD_64)
u8 pad[COMMANDLIST_PAD];
};