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Date: Sun, 8 Jun 2014 11:11:14 +0800
From: Ming Lei <ming.lei@...onical.com>
To: Suman Tripathi <stripathi@....com>
Cc: Dan Williams <dan.j.williams@...el.com>, Tejun Heo <tj@...nel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Loc Ho <lho@....com>, Tuan Phan <tphan@....com>
Subject: Re: [Regression] commit 8a4aeec8d(libata/ahci: accommodate tag
ordered controllers)
Hi Suman,
Could you forward the patches to me so that I can give a test?
I don't subscribe to linux-ide list.
Thanks,
--
Ming Lei
On Sat, Jun 7, 2014 at 5:33 AM, Suman Tripathi <stripathi@....com> wrote:
> Hi ,
>
> I have just posted 3 patches "ata: Fix the dma state machine lockup for APM
> X-Gene SoC SATA controller" . This patch set has fixed this tag ordering
> issue.
> Tested in apm mustang board.
>
> Thanks,
> with regards,
> suman
>
>
> On Fri, Jun 6, 2014 at 11:41 AM, Ming Lei <ming.lei@...onical.com> wrote:
>>
>> On Fri, Jun 6, 2014 at 10:57 AM, Dan Williams <dan.j.williams@...el.com>
>> wrote:
>> > On Fri, 2014-06-06 at 09:47 +0800, Ming Lei wrote:
>> >> Hi Tejun,
>> >>
>> >> On Thu, Jun 5, 2014 at 9:41 PM, Tejun Heo <tj@...nel.org> wrote:
>> >> > Hello,
>> >> >
>> >> > (cc'ing ahci_xgene folks)
>> >> >
>> >> > On Thu, Jun 05, 2014 at 09:24:04PM +0800, Ming Lei wrote:
>> >> >> On Thu, Jun 5, 2014 at 9:12 PM, Dan Williams
>> >> >> <dan.j.williams@...el.com> wrote:
>> >> >> > On Thu, Jun 5, 2014 at 1:53 AM, Ming Lei <ming.lei@...onical.com>
>> >> >> > wrote:
>> >> >> >> Hi Dan and Tejun,
>> >> >> >>
>> >> >> >> Looks the commit 8a4aeec8d(libata/ahci: accommodate tag ordered
>> >> >> >> controllers) causes below sata failure[1] on APM AHCI controller.
>> >> >> >>
>> >> >> >> And the error does disappear after reverting the commit.
>> >> >> >
>> >> >> > Can you give some more details about the workload and the disk?
>> >> >> > What
>> >> >> > is the APM AHCI?
>> >> >>
>> >> >> The commit causes the APM arm64 based system not bootable, and not
>> >> >> special workload, just when mounting rootfs or reading init files.
>> >> >>
>> >> >> APM AHCI:
>> >> >> drivers/ata/ahci_xgene.c
>> >> >
>> >> > Urgh... so, the controller can't handle tags allocated in round-robin
>> >> > instead of lowest-first? Ming, can you please test with different
>> >> > controllers / disks / ssds and see whether the problem stays with the
>> >> > controller? Loc, can you guys please look into it so that at least
>> >> > the next revision hardware can fix the issue?
>> >>
>> >> The problem has been observed on several apm arm64 boards
>> >> with different disks.
>> >>
>> >> >
>> >> > Provided that the tag allocation itself isn't broken, which isn't too
>> >> > likely given the lack of bug reports on other controllers, we'll need
>> >> > to blacklist ahci_xgene somehow. Either disable NCQ support on it or
>> >> > implement an alternative lowest-first tag allocation for it. If this
>> >> > actually is the controller freaking out about tags allocated in a
>> >> > different order, I'm not sure how much confidence we can put in its
>> >> > NCQ implementation tho and it might be a better idea to simply plug
>> >> > NCQ support on it until we understand the details of the problem.
>> >> >
>> >> > So, something like the following? Ming, can you please verify
>> >> > whether
>> >> > the following makes the machine boot again?
>> >>
>> >> Looks the problem still persists after applying your patch of disabling
>> >> NCQ.
>> >
>> > How about the following patch?
>> >
>> > 8<---------
>> > libata: allow xgene-ahci to opt-out of tag ordered submission
>> >
>> > From: Dan Williams <dan.j.williams@...el.com>
>> >
>> > Ming Lei reports:
>> > "Looks the commit 8a4aeec8d(libata/ahci: accommodate tag ordered
>> > controllers) causes below sata failure[1] on APM AHCI controller.
>> >
>> > And the error does disappear after reverting the commit.
>> >
>> > ata4.00: exception Emask 0x40 SAct 0xff00 SErr 0x800 action 0x6
>> > frozen
>> > ata4: SError: { HostInt }
>> > ata4.00: failed command: READ FPDMA QUEUED
>> > ata4.00: cmd 60/08:40:e0:a4:88/00:00:04:00:00/40 tag 8 ncq 4096 in
>> > res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x44
>> > (timeout)"
>> >
>> > Maintain tag ordered submission as the default, but allow xgene-ahci to
>> > continue with the old behavior.
>> >
>> > Reported-by: Ming Lei <ming.lei@...onical.com>
>> > Signed-off-by: Dan Williams <dan.j.williams@...el.com>
>> > ---
>> > drivers/ata/ahci_xgene.c | 1 +
>> > drivers/ata/libata-core.c | 42
>> > +++++++++++++++++++++++++++++++++++++++---
>> > drivers/ata/libata.h | 2 ++
>> > include/linux/libata.h | 1 +
>> > 4 files changed, 43 insertions(+), 3 deletions(-)
>> >
>> > diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
>> > index 77c89bf171f1..9be069f5f58a 100644
>> > --- a/drivers/ata/ahci_xgene.c
>> > +++ b/drivers/ata/ahci_xgene.c
>>
>> +#include "libata.h" is needed, otherwise build will fail.
>>
>> > @@ -300,6 +300,7 @@ static struct ata_port_operations xgene_ahci_ops = {
>> > .host_stop = xgene_ahci_host_stop,
>> > .hardreset = xgene_ahci_hardreset,
>> > .read_id = xgene_ahci_read_id,
>> > + .qc_new = ata_qc_new_fifo_order,
>> > };
>> >
>> > static const struct ata_port_info xgene_ahci_port_info = {
>> > diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
>> > index 943cc8b83e59..dd554354791f 100644
>> > --- a/drivers/ata/libata-core.c
>> > +++ b/drivers/ata/libata-core.c
>> > @@ -83,6 +83,7 @@ const struct ata_port_operations ata_base_port_ops = {
>> > .error_handler = ata_std_error_handler,
>> > .sched_eh = ata_std_sched_eh,
>> > .end_eh = ata_std_end_eh,
>> > + .qc_new = ata_qc_new_tag_order,
>> > };
>> >
>> > const struct ata_port_operations sata_port_ops = {
>> > @@ -4784,14 +4785,17 @@ void swap_buf_le16(u16 *buf, unsigned int
>> > buf_words)
>> > }
>> >
>> > /**
>> > - * ata_qc_new - Request an available ATA command, for queueing
>> > + * ata_qc_new_tag_order - Request an available ATA command, for
>> > queueing
>> > * @ap: target port
>> > *
>> > + * Accomodates controllers that issue commands in tag order rather
>> > + * than FIFO order (Intel AHCI).
>> > + *
>> > * LOCKING:
>> > * None.
>> > */
>> >
>> > -static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
>> > +struct ata_queued_cmd *ata_qc_new_tag_order(struct ata_port *ap)
>> > {
>> > struct ata_queued_cmd *qc = NULL;
>> > unsigned int i, tag;
>> > @@ -4819,6 +4823,38 @@ static struct ata_queued_cmd *ata_qc_new(struct
>> > ata_port *ap)
>> > }
>> >
>> > /**
>> > + * ata_qc_new_fifo_order - Request an available ATA command, for
>> > queueing
>> > + * @ap: target port
>> > + *
>> > + * Allocate first available tag, for hosts that maintain fifo issue
>> > + * order on the wire, or otherwise cannot handle tag order.
>> > + *
>> > + * LOCKING:
>> > + * None.
>> > + */
>> > +
>> > +struct ata_queued_cmd *ata_qc_new_fifo_order(struct ata_port *ap)
>> > +{
>> > + struct ata_queued_cmd *qc = NULL;
>> > + unsigned int i;
>> > +
>> > + /* no command while frozen */
>> > + if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
>> > + return NULL;
>> > +
>> > + /* the last tag is reserved for internal command. */
>> > + for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
>> > + if (!test_and_set_bit(i, &ap->qc_allocated)) {
>> > + qc = __ata_qc_from_tag(ap, i);
>> > + qc->tag = i;
>> > + break;
>> > + }
>> > +
>> > + return qc;
>> > +}
>> > +EXPORT_SYMBOL_GPL(ata_qc_new_fifo_order);
>> > +
>> > +/**
>> > * ata_qc_new_init - Request an available ATA command, and
>> > initialize it
>> > * @dev: Device from whom we request an available command structure
>> > *
>> > @@ -4831,7 +4867,7 @@ struct ata_queued_cmd *ata_qc_new_init(struct
>> > ata_device *dev)
>> > struct ata_port *ap = dev->link->ap;
>> > struct ata_queued_cmd *qc;
>> >
>> > - qc = ata_qc_new(ap);
>> > + qc = ap->ops->qc_new(ap);
>> > if (qc) {
>> > qc->scsicmd = NULL;
>> > qc->ap = ap;
>> > diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
>> > index 45b5ab3a95d5..381ba41de464 100644
>> > --- a/drivers/ata/libata.h
>> > +++ b/drivers/ata/libata.h
>> > @@ -90,6 +90,8 @@ extern int ata_down_xfermask_limit(struct ata_device
>> > *dev, unsigned int sel);
>> > extern unsigned int ata_dev_set_feature(struct ata_device *dev,
>> > u8 enable, u8 feature);
>> > extern void ata_sg_clean(struct ata_queued_cmd *qc);
>> > +extern struct ata_queued_cmd *ata_qc_new_tag_order(struct ata_port
>> > *ap);
>> > +extern struct ata_queued_cmd *ata_qc_new_fifo_order(struct ata_port
>> > *ap);
>> > extern void ata_qc_free(struct ata_queued_cmd *qc);
>> > extern void ata_qc_issue(struct ata_queued_cmd *qc);
>> > extern void __ata_qc_complete(struct ata_queued_cmd *qc);
>> > diff --git a/include/linux/libata.h b/include/linux/libata.h
>> > index 5ab4e3a76721..852686837d1c 100644
>> > --- a/include/linux/libata.h
>> > +++ b/include/linux/libata.h
>> > @@ -880,6 +880,7 @@ struct ata_port_operations {
>> > void (*qc_prep)(struct ata_queued_cmd *qc);
>> > unsigned int (*qc_issue)(struct ata_queued_cmd *qc);
>> > bool (*qc_fill_rtf)(struct ata_queued_cmd *qc);
>> > + struct ata_queued_cmd *(*qc_new)(struct ata_port *ap);
>> >
>> > /*
>> > * Configuration and exception handling
>>
>> After applying this patch again -next tree, the apm mustang board
>> can boot again.
>>
>> Tested-by: Ming Lei <ming.lei@...onical.com>
>>
>> Thanks,
>> --
>> Ming Lei
>
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