linux-kernel - Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find dma channel

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Date:	Fri, 18 Dec 2015 16:24:59 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Julian Margetson <runaway@...dw.ms>,
	Måns Rullgård <mans@...sr.com>
Cc:	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find
 dma channel

On Fri, 2015-12-18 at 09:52 -0400, Julian Margetson wrote:
> On 12/18/2015 8:45 AM, Måns Rullgård wrote:
> > Julian Margetson <runaway@...dw.ms> writes:

> > > > > [    4.784199] sata-dwc 4bffd1000.sata: id 0, controller
> > > > > version 1.82
> > > > > [    4.791186] scsi host0: sata-dwc
> > > > > [    4.794830] ata1: SATA max UDMA/133 irq 36
> > > > > [    4.799463] sata_sil 0001:00:04.0: Applying R_ERR on DMA
> > > > > activate FIS errata fix
> > > > > [    4.807959] scsi host1: sata_sil
> > > > > [    4.811662] scsi host2: sata_sil
> > > > > [    4.815242] ata2: SATA max UDMA/100 mmio m512@...84280000
> > > > > tf 0xd84280080 irq 21
> > > > > [    4.822990] ata3: SATA max UDMA/100 mmio m512@...84280000
> > > > > tf 0xd842800c0 irq 21
> > > > > 
> > > > > [    5.143502] ata1: SATA link up 3.0 Gbps (SStatus 123
> > > > > SControl 300)
> > > > > [    5.164367] ata2: SATA link up 1.5 Gbps (SStatus 113
> > > > > SControl 310)
> > > > > [    5.185174] ppc-of-ohci 4bffd0000.usb: irq 32, io mem
> > > > > 0x4bffd0000
> > > > > [    5.206125] Unable to handle kernel paging request for
> > > > > data at address 0x00000000
> > > > > [    5.228546] Faulting instruction address: 0xc043a2c8
> > > > > [    5.248577] Vector: 300 (Data Access) at [eddafae0]
> > > > > [    5.268658]     pc: c043a2c8: sata_dwc_qc_issue+0xb8/0x204
> > > > Well, that's not good.  Can you translate that address to a
> > > > line of code?
> > > > 
> > > need some guidance on method .
> > Enable CONFIG_DEBUG_INFO, then use this command:
> > 
> > $ addr2line -e vmlinux 0xc043a2c8
> > 
> > Obviously substitute the actual crashing address if it changes.
> > 
> addr2line -e vmlinux 0xc044b41c
> arch/powerpc/lib/copy_32.S:?

memcpy I suppose. Might be copy to unmapped memory.

Anyway, can you enable debug options as I suggested including debug for
sata driver ('dw_dmac_core.dyndbg dw_dmac.dyndbg sata_dwc_460ex.dydbg'
to the cmdline and CONFIG_DYNAMIC_DEBUG=y)?


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy

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