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SubjectRe: kernel 2.6.25 with ide driver cs5520 does not boot.
Date

Hi,

On Sunday 18 May 2008, TAKADA Yoshihito wrote:
> Hi.
>
> I disagree that this patch to remove IDE_HFLAG_VDMA.
> Because IDE_HFLAG_VDMA is refferd in drivers/ide/ide-dma.c.
> Well, currently, it's only cs5520 to sets thiss flag.

Depending on the results of the second patch that I posted (the one
forcing bus-mastering in cs5520) we may want to:

- extend ->host_flags to be of u64 type and re-enable IDE_HFLAG_VDMA

or

- remove IDE_HFLAG_VDMA host flag completely

In the meantime the patch below un-broke cs5520 driver in the upstream
kernel nicely.

> From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> Subject: Re: kernel 2.6.25 with ide driver cs5520 does not boot.
> Date: Wed, 14 May 2008 22:44:48 +0200
>
> > On Friday 09 May 2008, TAKADA Yoshihito wrote:
> > > Hi.
> > >
> > > From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> > > Subject: Re: kernel 2.6.25 with ide driver cs5520 does not boot.
> > > Date: Fri, 9 May 2008 11:27:53 +0200
> > >
> > > > On Friday 09 May 2008, TAKADA Yoshihito wrote:
> > > > > Thanks for quick reply.
> > > > >
> > > > > I tried 2.6.26rc1. It hangs same as 2.6.25.
> > > > > kernel 2.6.26rc1 with cs5520 cannot boot. cs5520 scans ide0 and ide1.
> > > > > It seems 2nd port DMA base issue was solved.
> > > >
> > > > [...]
> > > >
> > > > Thanks.
> > > >
> > > > The following patch for 2.6.26-rc1 disables VDMA, please give it a try
> > > > (I haven't time to fully audit VDMA support yet but lets see if it is
> > > > the main source of the problems).
> > >
> > > I applied the patch. But kernel was hung.
> > > And I attempt to kill IDE_HFLAG_CS5520. It cannot boot, oo.
> > >
> > > kill IDE_HFLAG_VDMA : hang
> > > kill IDE_HFLAG_CS5520: hang
> > > kill both flags : boot
> >
> > Thanks for investigating this - I forgot that currently VDMA and CS5520
> > host flags use the same bit (so it also needs to be fixed).
> >
> > I'm going to send the following patch to Linus (please verify it):
> >
> > From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> > Subject: [PATCH] cs5520: disable VDMA
> >
> > Disable Virtual DMA support for now (it causes system hangs).
> >
> > Thanks to TAKADA Yoshihito for the help with debugging the problem.
> >
> > Reported-by: TAKADA Yoshihito <takada@mbf.nifty.com>
> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> > ---
> > drivers/ide/pci/cs5520.c | 2 +-
> > include/linux/ide.h | 8 ++++----
> > 2 files changed, 5 insertions(+), 5 deletions(-)
> >
> > Index: b/drivers/ide/pci/cs5520.c
> > ===================================================================
> > --- a/drivers/ide/pci/cs5520.c
> > +++ b/drivers/ide/pci/cs5520.c
> > @@ -119,6 +119,7 @@ static const struct ide_dma_ops cs5520_d
> > .dma_timeout = ide_dma_timeout,
> > };
> >
> > +/* FIXME: VDMA is disabled because it caused system hangs */
> > #define DECLARE_CS_DEV(name_str) \
> > { \
> > .name = name_str, \
> > @@ -126,7 +127,6 @@ static const struct ide_dma_ops cs5520_d
> > .dma_ops = &cs5520_dma_ops, \
> > .host_flags = IDE_HFLAG_ISA_PORTS | \
> > IDE_HFLAG_CS5520 | \
> > - IDE_HFLAG_VDMA | \
> > IDE_HFLAG_NO_ATAPI_DMA | \
> > IDE_HFLAG_ABUSE_SET_DMA_MODE, \
> > .pio_mask = ATA_PIO4, \
> > Index: b/include/linux/ide.h
> > ===================================================================
> > --- a/include/linux/ide.h
> > +++ b/include/linux/ide.h
> > @@ -1058,8 +1058,8 @@ enum {
> > IDE_HFLAG_NO_SET_MODE = (1 << 9),
> > /* trust BIOS for programming chipset/device for DMA */
> > IDE_HFLAG_TRUST_BIOS_FOR_DMA = (1 << 10),
> > - /* host uses VDMA (tied with IDE_HFLAG_CS5520 for now) */
> > - IDE_HFLAG_VDMA = (1 << 11),
> > + /* host is CS5510/CS5520 */
> > + IDE_HFLAG_CS5520 = (1 << 11),
> > /* ATAPI DMA is unsupported */
> > IDE_HFLAG_NO_ATAPI_DMA = (1 << 12),
> > /* set if host is a "non-bootable" controller */
> > @@ -1070,8 +1070,6 @@ enum {
> > IDE_HFLAG_NO_AUTODMA = (1 << 15),
> > /* host uses MMIO */
> > IDE_HFLAG_MMIO = (1 << 16),
> > - /* host is CS5510/CS5520 */
> > - IDE_HFLAG_CS5520 = IDE_HFLAG_VDMA,
> > /* no LBA48 */
> > IDE_HFLAG_NO_LBA48 = (1 << 17),
> > /* no LBA48 DMA */
> > @@ -1101,6 +1099,8 @@ enum {
> > IDE_HFLAG_NO_IO_32BIT = (1 << 30),
> > /* never unmask IRQs */
> > IDE_HFLAG_NO_UNMASK_IRQS = (1 << 31),
> > + /* host uses VDMA (disabled for now) */
> > + IDE_HFLAG_VDMA = 0,
> > };
> >
> > #ifdef CONFIG_BLK_DEV_OFFBOARD


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