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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
and both resets.
* dump_id: dump IDENTIFY data.
If there are multiple matching configurations changing
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;
}
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.
*/
@ -6377,6 +6385,7 @@ static int __init ata_parse_force_one(char **cur,
{ "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) },

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_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 */