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authorChris Boot <bootc@bootc.net>2012-02-15 18:59:08 +0400
committerStefan Richter <stefanr@s5r6.in-berlin.de>2012-02-23 01:36:01 +0400
commit8ff6a75744dfc0ea19a03c0ac5a438ef8d825342 (patch)
tree218244aab1394d4823df06ccdab08248dc756aa3 /drivers/firewire
parente894d1d7fd8cfa89a085df2d368a5e652751b0a1 (diff)
downloadlinux-8ff6a75744dfc0ea19a03c0ac5a438ef8d825342.tar.xz
firewire: sbp2: Take into account Unit_Unique_ID
If the target's unit directory contains a Unit_Unique_ID entry, we should use that as the target's GUID for identification purposes. The SBP-2 standards document says: "Although the node unique ID (EUI-64) present in the bus information block is sufficient to uniquely identify nodes attached to Serial Bus, it is insufficient to identify a target when a vendor implements a device with multiple Serial Bus node connections. In this case initiator software requires information by which a particular target may be uniquely identified, regardless of the Serial Bus access path used." [ IEEE T10 P1155D Revision 4, Section 7.6 (page 51) ] and [ IEEE T10 P1467D Revision 5, Section 7.9 (page 74) ] Signed-off-by: Chris Boot <bootc@bootc.net> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/sbp2.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 481e1c855c55..4865d641329a 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -218,6 +218,7 @@ static const struct device *lu_dev(const struct sbp2_logical_unit *lu)
#define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
#define SBP2_CSR_FIRMWARE_REVISION 0x3c
#define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
+#define SBP2_CSR_UNIT_UNIQUE_ID 0x8d
#define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
/* Management orb opcodes */
@@ -1005,6 +1006,13 @@ static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
return 0;
}
+static void sbp2_get_unit_unique_id(struct sbp2_target *tgt,
+ const u32 *leaf)
+{
+ if ((leaf[0] & 0xffff0000) == 0x00020000)
+ tgt->guid = (u64)leaf[1] << 32 | leaf[2];
+}
+
static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt,
const u32 *directory)
{
@@ -1056,6 +1064,10 @@ static int sbp2_scan_unit_dir(struct sbp2_target *tgt, const u32 *directory,
return -ENOMEM;
break;
+ case SBP2_CSR_UNIT_UNIQUE_ID:
+ sbp2_get_unit_unique_id(tgt, ci.p - 1 + value);
+ break;
+
case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
/* Adjust for the increment in the iterator */
if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0)