Date: Wed, 15 Feb 2012 14:59:08 +0000 From: Chris Boot Subject: 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 Signed-off-by: Stefan Richter --- drivers/firewire/sbp2.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/drivers/firewire/sbp2.c +++ b/drivers/firewire/sbp2.c @@ -218,6 +218,7 @@ static const struct device *lu_dev(const #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 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 sbp 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)