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sata_sil24: prevent hba lockup when pass-through ATA commands are used

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Fix commands timeout with Sil3124/3132 based HBA when pass-through ATA
commands [where ATA_QCFLAG_RESULT_TF is set] are used while other
commands are active on other devices connected to the same port with a
Port Multiplier.  Due to a hardware bug, these commands must be sent
alone, like ATAPI commands.

Signed-off-by: Gwendal Grignou <gwendal@google.com>
Acked-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Gwendal Grignou 2008-01-10 15:47:56 +09:00 committed by Jeff Garzik
parent fcb71f6f03
commit 13cc546be3
1 changed files with 25 additions and 10 deletions
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35
drivers/ata/sata_sil24.c
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@ -832,16 +832,31 @@ static int sil24_qc_defer(struct ata_queued_cmd *qc)
struct ata_link *link = qc->dev->link;
struct ata_port *ap = link->ap;
u8 prot = qc->tf.protocol;
int is_atapi = (prot == ATA_PROT_ATAPI ||
prot == ATA_PROT_ATAPI_NODATA ||
prot == ATA_PROT_ATAPI_DMA);
/* ATAPI commands completing with CHECK_SENSE cause various
* weird problems if other commands are active. PMP DMA CS
* errata doesn't cover all and HSM violation occurs even with
* only one other device active. Always run an ATAPI command
* by itself.
*/
/*
* There is a bug in the chip:
* Port LRAM Causes the PRB/SGT Data to be Corrupted
* If the host issues a read request for LRAM and SActive registers
* while active commands are available in the port, PRB/SGT data in
* the LRAM can become corrupted. This issue applies only when
* reading from, but not writing to, the LRAM.
*
* Therefore, reading LRAM when there is no particular error [and
* other commands may be outstanding] is prohibited.
*
* To avoid this bug there are two situations where a command must run
* exclusive of any other commands on the port:
*
* - ATAPI commands which check the sense data
* - Passthrough ATA commands which always have ATA_QCFLAG_RESULT_TF
* set.
*
*/
int is_excl = (prot == ATA_PROT_ATAPI ||
prot == ATA_PROT_ATAPI_NODATA ||
prot == ATA_PROT_ATAPI_DMA ||
(qc->flags & ATA_QCFLAG_RESULT_TF));
if (unlikely(ap->excl_link)) {
if (link == ap->excl_link) {
if (ap->nr_active_links)
@ -849,7 +864,7 @@ static int sil24_qc_defer(struct ata_queued_cmd *qc)
qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
} else
return ATA_DEFER_PORT;
} else if (unlikely(is_atapi)) {
} else if (unlikely(is_excl)) {
ap->excl_link = link;
if (ap->nr_active_links)
return ATA_DEFER_PORT;