Add dump_id libata.force parameter. If specified, libata dumps full IDENTIFY data during device configuration. This is to aid debugging. Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> Cc: Larry Baker <baker@xxxxxxxx> --- Documentation/kernel-parameters.txt | 2 ++ drivers/ata/libata-core.c | 9 +++++++++ include/linux/libata.h | 1 + 3 files changed, 12 insertions(+) Index: ata/drivers/ata/libata-core.c =================================================================== --- ata.orig/drivers/ata/libata-core.c +++ ata/drivers/ata/libata-core.c @@ -2122,6 +2122,14 @@ retry: goto err_out; } + if (dev->horkage & ATA_HORKAGE_DUMP_ID) { + ata_dev_printk(dev, KERN_DEBUG, "dumping IDENTIFY data, " + "class=%d may_fallback=%d tried_spinup=%d\n", + class, may_fallback, tried_spinup); + print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, + 16, 2, id, ATA_ID_WORDS * sizeof(*id), true); + } + /* Falling back doesn't make sense if ID data was read * successfully at least once. */ @@ -6372,6 +6380,7 @@ static int __init ata_parse_force_one(ch { "3.0Gbps", .spd_limit = 2 }, { "noncq", .horkage_on = ATA_HORKAGE_NONCQ }, { "ncq", .horkage_off = ATA_HORKAGE_NONCQ }, + { "dump_id", .horkage_on = ATA_HORKAGE_DUMP_ID }, { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) }, { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) }, { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) }, Index: ata/include/linux/libata.h =================================================================== --- ata.orig/include/linux/libata.h +++ ata/include/linux/libata.h @@ -386,6 +386,7 @@ enum { ATA_HORKAGE_1_5_GBPS = (1 << 13), /* force 1.5 Gbps */ ATA_HORKAGE_NOSETXFER = (1 << 14), /* skip SETXFER, SATA only */ ATA_HORKAGE_BROKEN_FPDMA_AA = (1 << 15), /* skip AA */ + ATA_HORKAGE_DUMP_ID = (1 << 16), /* dump IDENTIFY data */ /* DMA mask for user DMA control: User visible values; DO NOT renumber */ Index: ata/Documentation/kernel-parameters.txt =================================================================== --- ata.orig/Documentation/kernel-parameters.txt +++ ata/Documentation/kernel-parameters.txt @@ -1227,6 +1227,8 @@ and is between 256 and 4096 characters. * nohrst, nosrst, norst: suppress hard, soft and both resets. + * dump_id: dump IDENTIFY data. + If there are multiple matching configurations changing the same attribute, the last one is used. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html