Re: sun4v_data_access_exception on new 2.6.23

[BERTRAND Joël <joel.bertrand@xxxxxxxxxxx>]

David Miller wrote:
> From: BERTRAND_Joël <joel.bertrand@xxxxxxxxxxx>
> Date: Fri, 12 Oct 2007 09:04:16 +0200
>
> > Writing inode tables: Kernel unaligned access at TPC[56004c] 
> > xor_niagara_4+0x5c/0x128
> > sun4v_data_access_exception: ADDR[000000000053d354] CTX[0000] 
> > TYPE[000a], going.
>
> Please try this patch:
>
> diff --git a/arch/sparc64/lib/xor.S b/arch/sparc64/lib/xor.S
> index a79c888..f44f58f 100644
> --- a/arch/sparc64/lib/xor.S
> +++ b/arch/sparc64/lib/xor.S
> @@ -491,12 +491,12 @@ xor_niagara_4:		/* %o0=bytes, %o1=dest, %o2=src1, %o3=src2, %o4=src3 */
>  	ldda		[%i1 + 0x10] %asi, %i2	/* %i2/%i3 = src1 + 0x10 */
>  	xor		%g2, %i4, %g2
>  	xor		%g3, %i5, %g3
> -	ldda		[%i7 + 0x10] %asi, %i4	/* %i4/%i5 = src2 + 0x10 */
> +	ldda		[%l7 + 0x10] %asi, %i4	/* %i4/%i5 = src2 + 0x10 */
>  	xor		%l0, %g2, %l0
>  	xor		%l1, %g3, %l1
>  	stxa		%l0, [%i0 + 0x00] %asi
>  	stxa		%l1, [%i0 + 0x08] %asi
> -	ldda		[%i6 + 0x10] %asi, %g2	/* %g2/%g3 = src3 + 0x10 */
> +	ldda		[%l6 + 0x10] %asi, %g2	/* %g2/%g3 = src3 + 0x10 */
>  	ldda		[%i0 + 0x10] %asi, %l0	/* %l0/%l1 = dest + 0x10 */
>  
>  	xor		%i4, %i2, %i4
> @@ -504,12 +504,12 @@ xor_niagara_4:		/* %o0=bytes, %o1=dest, %o2=src1, %o3=src2, %o4=src3 */
>  	ldda		[%i1 + 0x20] %asi, %i2	/* %i2/%i3 = src1 + 0x20 */
>  	xor		%g2, %i4, %g2
>  	xor		%g3, %i5, %g3
> -	ldda		[%i7 + 0x20] %asi, %i4	/* %i4/%i5 = src2 + 0x20 */
> +	ldda		[%l7 + 0x20] %asi, %i4	/* %i4/%i5 = src2 + 0x20 */
>  	xor		%l0, %g2, %l0
>  	xor		%l1, %g3, %l1
>  	stxa		%l0, [%i0 + 0x10] %asi
>  	stxa		%l1, [%i0 + 0x18] %asi
> -	ldda		[%i6 + 0x20] %asi, %g2	/* %g2/%g3 = src3 + 0x20 */
> +	ldda		[%l6 + 0x20] %asi, %g2	/* %g2/%g3 = src3 + 0x20 */
>  	ldda		[%i0 + 0x20] %asi, %l0	/* %l0/%l1 = dest + 0x20 */
>  
>  	xor		%i4, %i2, %i4
> @@ -517,12 +517,12 @@ xor_niagara_4:		/* %o0=bytes, %o1=dest, %o2=src1, %o3=src2, %o4=src3 */
>  	ldda		[%i1 + 0x30] %asi, %i2	/* %i2/%i3 = src1 + 0x30 */
>  	xor		%g2, %i4, %g2
>  	xor		%g3, %i5, %g3
> -	ldda		[%i7 + 0x30] %asi, %i4	/* %i4/%i5 = src2 + 0x30 */
> +	ldda		[%l7 + 0x30] %asi, %i4	/* %i4/%i5 = src2 + 0x30 */
>  	xor		%l0, %g2, %l0
>  	xor		%l1, %g3, %l1
>  	stxa		%l0, [%i0 + 0x20] %asi
>  	stxa		%l1, [%i0 + 0x28] %asi
> -	ldda		[%i6 + 0x30] %asi, %g2	/* %g2/%g3 = src3 + 0x30 */
> +	ldda		[%l6 + 0x30] %asi, %g2	/* %g2/%g3 = src3 + 0x30 */
>  	ldda		[%i0 + 0x30] %asi, %l0	/* %l0/%l1 = dest + 0x30 */
>  
>  	prefetch	[%i1 + 0x40], #one_read

	David,

	I think that your patch fix this bug. I shall test on other T1000 this 
afternoon.

	Thanks,

	JKB
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