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Message-ID: <f96157c40607250727o685b8195i67da8c68123728f@mail.gmail.com>
Date: Tue, 25 Jul 2006 14:27:31 +0000
From: "gmu 2k6" <gmu2006@...il.com>
To: "Jens Axboe" <axboe@...e.de>
Cc: linux-kernel@...r.kernel.org
Subject: Re: Re: i686 hang on boot in userspace
On 7/25/06, Jens Axboe <axboe@...e.de> wrote:
> On Tue, Jul 25 2006, Jens Axboe wrote:
> > On Tue, Jul 25 2006, gmu 2k6 wrote:
> > > On 7/25/06, Jens Axboe <axboe@...e.de> wrote:
> > > >On Tue, Jul 25 2006, gmu 2k6 wrote:
> > > >> ok, let's nail it to 2.6.17-git5 instead as it survived git status
> > > >> compared to -git6
> > > >> which seems to have correctly booted by accident the lastime. timing
> > > >issues
> > > >> I guess.
> > > >
> > > >I will try and reproduce it here now. It seems to be in between commit
> > > >271f18f102c789f59644bb6c53a69da1df72b2f4 and commit
> > > >dd67d051529387f6e44d22d1d5540ef281965fdd where the first one could also
> > > >be bad.
> > > >
> > > >I'm assuming that acf421755593f7d7bd9352d57eda796c6eb4fa43 should be
> > > >good, so you can try and verify that
> > > >dd67d051529387f6e44d22d1d5540ef281965fdd is bad and bisect between the
> > > >two. It's only about 6 commits, so should be quick enough to do.
> > >
> > > 1) no luck with remote serial console
> > > 2) netconsole does not work although connecting to the listener with netcat
> > > and
> > > sending strings works
> > > I'm gonna try via physical rs232 9pins and see how that works.
> > > afterwards I will try to bisect the revisions you mentioned.
> > >
> > > btw, the issue seems to come and go as I managed to boot log into a .17-git6
> > > kernel or is timing-dependent.
> >
> > I can reproduce it, you don't have to spend more time on bisecting or
> > testing. This should fix it:
> >
> > diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> > index 1c4df22..1eac041 100644
> > --- a/drivers/block/cciss.c
> > +++ b/drivers/block/cciss.c
> > @@ -1238,6 +1238,7 @@ static void cciss_softirq_done(struct re
> > CommandList_struct *cmd = rq->completion_data;
> > ctlr_info_t *h = hba[cmd->ctlr];
> > unsigned long flags;
> > + request_queue_t *q;
> > u64bit temp64;
> > int i, ddir;
> >
> > @@ -1260,10 +1261,13 @@ #ifdef CCISS_DEBUG
> > printk("Done with %p\n", rq);
> > #endif /* CCISS_DEBUG */
> >
> > + q = rq->q;
> > +
> > add_disk_randomness(rq->rq_disk);
> > spin_lock_irqsave(&h->lock, flags);
> > end_that_request_last(rq, rq->errors);
> > cmd_free(h, cmd, 1);
> > + blk_start_queue(q);
> > spin_unlock_irqrestore(&h->lock, flags);
> > }
> >
> >
> > A better fix would rework the start_queue logic entirely in the driver,
> > but the above should get you running for now. I'll take a further look.
>
> Something like this matches the current logic better. It's not very good
> from a cpu efficiency point of view, but it's better than what is there
> now since at least it's not in hard irq context.
>
> Not tested yet, will do so right now.
>
> diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> index 1c4df22..a9e0510 100644
> --- a/drivers/block/cciss.c
> +++ b/drivers/block/cciss.c
> @@ -1233,6 +1233,50 @@ static inline void complete_buffers(stru
> }
> }
>
> +static void cciss_check_queues(ctlr_info_t *h)
> +{
> + int start_queue = h->next_to_run;
> + int i;
> +
> + /* check to see if we have maxed out the number of commands that can
> + * be placed on the queue. If so then exit. We do this check here
> + * in case the interrupt we serviced was from an ioctl and did not
> + * free any new commands.
> + */
> + if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS)
> + return;
> +
> + /* We have room on the queue for more commands. Now we need to queue
> + * them up. We will also keep track of the next queue to run so
> + * that every queue gets a chance to be started first.
> + */
> + for (i = 0; i < h->highest_lun + 1; i++) {
> + int curr_queue = (start_queue + i) % (h->highest_lun + 1);
> + /* make sure the disk has been added and the drive is real
> + * because this can be called from the middle of init_one.
> + */
> + if (!(h->drv[curr_queue].queue) || !(h->drv[curr_queue].heads))
> + continue;
> + blk_start_queue(h->gendisk[curr_queue]->queue);
> +
> + /* check to see if we have maxed out the number of commands
> + * that can be placed on the queue.
> + */
> + if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS) {
> + if (curr_queue == start_queue) {
> + h->next_to_run =
> + (start_queue + 1) % (h->highest_lun + 1);
> + break;
> + } else {
> + h->next_to_run = curr_queue;
> + break;
> + }
> + } else {
> + curr_queue = (curr_queue + 1) % (h->highest_lun + 1);
> + }
> + }
> +}
> +
> static void cciss_softirq_done(struct request *rq)
> {
> CommandList_struct *cmd = rq->completion_data;
> @@ -1264,6 +1308,7 @@ #endif /* CCISS_DEBUG */
> spin_lock_irqsave(&h->lock, flags);
> end_that_request_last(rq, rq->errors);
> cmd_free(h, cmd, 1);
> + cciss_check_queues(h);
> spin_unlock_irqrestore(&h->lock, flags);
> }
>
> @@ -2528,8 +2573,6 @@ static irqreturn_t do_cciss_intr(int irq
> CommandList_struct *c;
> unsigned long flags;
> __u32 a, a1, a2;
> - int j;
> - int start_queue = h->next_to_run;
>
> if (interrupt_not_for_us(h))
> return IRQ_NONE;
> @@ -2588,45 +2631,6 @@ # endif
> }
> }
>
> - /* check to see if we have maxed out the number of commands that can
> - * be placed on the queue. If so then exit. We do this check here
> - * in case the interrupt we serviced was from an ioctl and did not
> - * free any new commands.
> - */
> - if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS)
> - goto cleanup;
> -
> - /* We have room on the queue for more commands. Now we need to queue
> - * them up. We will also keep track of the next queue to run so
> - * that every queue gets a chance to be started first.
> - */
> - for (j = 0; j < h->highest_lun + 1; j++) {
> - int curr_queue = (start_queue + j) % (h->highest_lun + 1);
> - /* make sure the disk has been added and the drive is real
> - * because this can be called from the middle of init_one.
> - */
> - if (!(h->drv[curr_queue].queue) || !(h->drv[curr_queue].heads))
> - continue;
> - blk_start_queue(h->gendisk[curr_queue]->queue);
> -
> - /* check to see if we have maxed out the number of commands
> - * that can be placed on the queue.
> - */
> - if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS) {
> - if (curr_queue == start_queue) {
> - h->next_to_run =
> - (start_queue + 1) % (h->highest_lun + 1);
> - goto cleanup;
> - } else {
> - h->next_to_run = curr_queue;
> - goto cleanup;
> - }
> - } else {
> - curr_queue = (curr_queue + 1) % (h->highest_lun + 1);
> - }
> - }
> -
> - cleanup:
> spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
> return IRQ_HANDLED;
> }
this makes the cciss init hang.
-
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