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libata: implement dump_id force param

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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@kernel.org>
Cc: Larry Baker <baker@usgs.gov>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2010-05-23 12:59:11 +02:00 committed by Jeff Garzik
parent e7ecd43569
commit 43c9c59185
3 changed files with 12 additions and 0 deletions
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2
Documentation/kernel-parameters.txt
View file

@ -1252,6 +1252,8 @@ and is between 256 and 4096 characters. It is defined in the file
* nohrst, nosrst, norst: suppress hard, soft * nohrst, nosrst, norst: suppress hard, soft
and both resets. and both resets.
* dump_id: dump IDENTIFY data.
If there are multiple matching configurations changing If there are multiple matching configurations changing
the same attribute, the last one is used. the same attribute, the last one is used.

9
drivers/ata/libata-core.c
View file

@ -2126,6 +2126,14 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
goto err_out; 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 /* Falling back doesn't make sense if ID data was read
* successfully at least once. * successfully at least once.
*/ */
@ -6377,6 +6385,7 @@ static int __init ata_parse_force_one(char **cur,
{ "3.0Gbps", .spd_limit = 2 }, { "3.0Gbps", .spd_limit = 2 },
{ "noncq", .horkage_on = ATA_HORKAGE_NONCQ }, { "noncq", .horkage_on = ATA_HORKAGE_NONCQ },
{ "ncq", .horkage_off = 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) }, { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) },
{ "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) }, { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) },
{ "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) }, { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) },

1
include/linux/libata.h
View file

@ -386,6 +386,7 @@ enum {
ATA_HORKAGE_1_5_GBPS = (1 << 13), /* force 1.5 Gbps */ ATA_HORKAGE_1_5_GBPS = (1 << 13), /* force 1.5 Gbps */
ATA_HORKAGE_NOSETXFER = (1 << 14), /* skip SETXFER, SATA only */ ATA_HORKAGE_NOSETXFER = (1 << 14), /* skip SETXFER, SATA only */
ATA_HORKAGE_BROKEN_FPDMA_AA = (1 << 15), /* skip AA */ 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 /* DMA mask for user DMA control: User visible values; DO NOT
renumber */ renumber */