On Tue, Oct 08, 2019 at 11:19:41PM +0300, Horia Geantă wrote:
> commit 48f89d2a2920166c35b1c0b69917dbb0390ebec7 upstream.
>
> IV transfer from ofifo to class2 (set up at [29][30]) is not guaranteed
> to be scheduled before the data transfer from ofifo to external memory
> (set up at [38]:
>
> [29] 10FA0004 ld: ind-nfifo (len=4) imm
> [30] 81F00010 <nfifo_entry: ofifo->class2 type=msg len=16>
> [31] 14820004 ld: ccb2-datasz len=4 offs=0 imm
> [32] 00000010 data:0x00000010
> [33] 8210010D operation: cls1-op aes cbc init-final enc
> [34] A8080B04 math: (seqin + math0)->vseqout len=4
> [35] 28000010 seqfifold: skip len=16
> [36] A8080A04 math: (seqin + math0)->vseqin len=4
> [37] 2F1E0000 seqfifold: both msg1->2-last2-last1 len=vseqinsz
> [38] 69300000 seqfifostr: msg len=vseqoutsz
> [39] 5C20000C seqstr: ccb2 ctx len=12 offs=0
>
> If ofifo -> external memory transfer happens first, DECO will hang
> (issuing a Watchdog Timeout error, if WDOG is enabled) waiting for
> data availability in ofifo for the ofifo -> c2 ififo transfer.
>
> Make sure IV transfer happens first by waiting for all CAAM internal
> transfers to end before starting payload transfer.
>
> New descriptor with jump command inserted at [37]:
>
> [..]
> [36] A8080A04 math: (seqin + math0)->vseqin len=4
> [37] A1000401 jump: jsl1 all-match[!nfifopend] offset=[01] local->[38]
> [38] 2F1E0000 seqfifold: both msg1->2-last2-last1 len=vseqinsz
> [39] 69300000 seqfifostr: msg len=vseqoutsz
> [40] 5C20000C seqstr: ccb2 ctx len=12 offs=0
>
> [Note: the issue is present in the descriptor from the very beginning
> (cf. Fixes tag). However I've marked it v4.19+ since it's the oldest
> maintained kernel that the patch applies clean against.]
>
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.19+
> Fixes: 1acebad3d8db8 ("crypto: caam - faster aead implementation")
> Signed-off-by: Horia Geantă <horia.geanta@xxxxxxx>
> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> [Horia: backport to v4.4, v4.9]
> Signed-off-by: Horia Geantă <horia.geanta@xxxxxxx>
Now queued up, thanks.
greg k-h
