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libata: implement no[hs]rst force params 

Implement force params nohrst, nosrst and norst.  This is to work
around reset related problems and ease debugging.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2008-08-13 20:19:09 +09:00 committed by Jeff Garzik
parent 6a55617ed5
commit 05944bdf6f
4 changed files with 38 additions and 16 deletions
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3
Documentation/kernel-parameters.txt
View File

@ -1074,6 +1074,9 @@ and is between 256 and 4096 characters. It is defined in the file
* [no]ncq: Turn on or off NCQ.
* nohrst, nosrst, norst: suppress hard, soft
and both resets.
If there are multiple matching configurations changing
the same attribute, the last one is used.

44
drivers/ata/libata-core.c
View File

@ -104,6 +104,7 @@ struct ata_force_param {
unsigned long xfer_mask;
unsigned int horkage_on;
unsigned int horkage_off;
unsigned int lflags;
};
struct ata_force_ent {
@ -196,22 +197,23 @@ void ata_force_cbl(struct ata_port *ap)
}
/**
* ata_force_spd_limit - force SATA spd limit according to libata.force
* ata_force_link_limits - force link limits according to libata.force
* @link: ATA link of interest
*
* Force SATA spd limit according to libata.force and whine about
* it. When only the port part is specified (e.g. 1:), the limit
* applies to all links connected to both the host link and all
* fan-out ports connected via PMP. If the device part is
* specified as 0 (e.g. 1.00:), it specifies the first fan-out
* link not the host link. Device number 15 always points to the
* host link whether PMP is attached or not.
* Force link flags and SATA spd limit according to libata.force
* and whine about it. When only the port part is specified
* (e.g. 1:), the limit applies to all links connected to both
* the host link and all fan-out ports connected via PMP. If the
* device part is specified as 0 (e.g. 1.00:), it specifies the
* first fan-out link not the host link. Device number 15 always
* points to the host link whether PMP is attached or not.
*
* LOCKING:
* EH context.
*/
static void ata_force_spd_limit(struct ata_link *link)
static void ata_force_link_limits(struct ata_link *link)
{
bool did_spd = false;
int linkno, i;
if (ata_is_host_link(link))
@ -228,13 +230,22 @@ static void ata_force_spd_limit(struct ata_link *link)
if (fe->device != -1 && fe->device != linkno)
continue;
if (!fe->param.spd_limit)
continue;
/* only honor the first spd limit */
if (!did_spd && fe->param.spd_limit) {
link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
ata_link_printk(link, KERN_NOTICE,
"FORCE: PHY spd limit set to %s\n", fe->param.name);
return;
"FORCE: PHY spd limit set to %s\n",
fe->param.name);
did_spd = true;
}
/* let lflags stack */
if (fe->param.lflags) {
link->flags |= fe->param.lflags;
ata_link_printk(link, KERN_NOTICE,
"FORCE: link flag 0x%x forced -> 0x%x\n",
fe->param.lflags, link->flags);
}
}
}
@ -5200,7 +5211,7 @@ int sata_link_init_spd(struct ata_link *link)
if (spd)
link->hw_sata_spd_limit &= (1 << spd) - 1;
ata_force_spd_limit(link);
ata_force_link_limits(link);
link->sata_spd_limit = link->hw_sata_spd_limit;
@ -5991,6 +6002,9 @@ static int __init ata_parse_force_one(char **cur,
{ "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
{ "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
{ "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) },
{ "nohrst", .lflags = ATA_LFLAG_NO_HRST },
{ "nosrst", .lflags = ATA_LFLAG_NO_SRST },
{ "norst", .lflags = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
};
char *start = *cur, *p = *cur;
char *id, *val, *endp;

4
drivers/ata/libata-eh.c
View File

@ -2210,6 +2210,10 @@ int ata_eh_reset(struct ata_link *link, int classify,
*/
while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
max_tries++;
if (link->flags & ATA_LFLAG_NO_HRST)
hardreset = NULL;
if (link->flags & ATA_LFLAG_NO_SRST)
softreset = NULL;
now = jiffies;
deadline = ata_deadline(ehc->last_reset, ATA_EH_RESET_COOL_DOWN);

1
include/linux/libata.h
View File

@ -163,6 +163,7 @@ enum {
ATA_DEV_NONE = 9, /* no device */
/* struct ata_link flags */
ATA_LFLAG_NO_HRST = (1 << 1), /* avoid hardreset */
ATA_LFLAG_NO_SRST = (1 << 2), /* avoid softreset */
ATA_LFLAG_ASSUME_ATA = (1 << 3), /* assume ATA class */
ATA_LFLAG_ASSUME_SEMB = (1 << 4), /* assume SEMB class */