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

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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