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SubjectRe: [PATCH] NCR5380: Support chained sg lists

On Tue, 11 Jun 2019, Michael Schmitz wrote:

> Hi Finn,
>
> Thanks - can't test this on my hardware but looks good to me.
>

Thanks for looking it over.

Would you be willing to send a "reviewed-by" tag?

I tested this successfully on my PowerBook 180 using the parameters
mac_scsi.setup_sg_tablesize=128 mac_scsi.setup_use_pdma=0

(Only because PDMA doesn't work with sg_tablesize > 1 with this particular
drive.)

--

> Cheers,
>
> Michael
>
> Am 11.06.2019 um 15:25 schrieb Finn Thain:
> > My understanding is that support for chained scatterlists is to
> > become mandatory for LLDs.
> >
> > Cc: Michael Schmitz <schmitzmic@gmail.com>
> > Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
> > ---
> > drivers/scsi/NCR5380.c | 41 ++++++++++++++++++-----------------------
> > 1 file changed, 18 insertions(+), 23 deletions(-)
> >
> > diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
> > index d9fa9cf2fd8b..536426f25e86 100644
> > --- a/drivers/scsi/NCR5380.c
> > +++ b/drivers/scsi/NCR5380.c
> > @@ -149,12 +149,10 @@ static inline void initialize_SCp(struct scsi_cmnd
> > *cmd)
> >
> > if (scsi_bufflen(cmd)) {
> > cmd->SCp.buffer = scsi_sglist(cmd);
> > - cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
> > cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
> > cmd->SCp.this_residual = cmd->SCp.buffer->length;
> > } else {
> > cmd->SCp.buffer = NULL;
> > - cmd->SCp.buffers_residual = 0;
> > cmd->SCp.ptr = NULL;
> > cmd->SCp.this_residual = 0;
> > }
> > @@ -163,6 +161,17 @@ static inline void initialize_SCp(struct scsi_cmnd
> > *cmd)
> > cmd->SCp.Message = 0;
> > }
> >
> > +static inline void advance_sg_buffer(struct scsi_cmnd *cmd)
> > +{
> > + struct scatterlist *s = cmd->SCp.buffer;
> > +
> > + if (!cmd->SCp.this_residual && s && !sg_is_last(s)) {
> > + cmd->SCp.buffer = sg_next(s);
> > + cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
> > + cmd->SCp.this_residual = cmd->SCp.buffer->length;
> > + }
> > +}
> > +
> > /**
> > * NCR5380_poll_politely2 - wait for two chip register values
> > * @hostdata: host private data
> > @@ -1670,12 +1679,7 @@ static void NCR5380_information_transfer(struct
> > Scsi_Host *instance)
> > sun3_dma_setup_done != cmd) {
> > int count;
> >
> > - if (!cmd->SCp.this_residual &&
> > cmd->SCp.buffers_residual) {
> > - ++cmd->SCp.buffer;
> > - --cmd->SCp.buffers_residual;
> > - cmd->SCp.this_residual =
> > cmd->SCp.buffer->length;
> > - cmd->SCp.ptr =
> > sg_virt(cmd->SCp.buffer);
> > - }
> > + advance_sg_buffer(cmd);
> >
> > count = sun3scsi_dma_xfer_len(hostdata, cmd);
> >
> > @@ -1725,15 +1729,11 @@ static void NCR5380_information_transfer(struct
> > Scsi_Host *instance)
> > * scatter-gather list, move onto the next
> > one.
> > */
> >
> > - if (!cmd->SCp.this_residual &&
> > cmd->SCp.buffers_residual) {
> > - ++cmd->SCp.buffer;
> > - --cmd->SCp.buffers_residual;
> > - cmd->SCp.this_residual =
> > cmd->SCp.buffer->length;
> > - cmd->SCp.ptr =
> > sg_virt(cmd->SCp.buffer);
> > - dsprintk(NDEBUG_INFORMATION, instance,
> > "%d bytes and %d buffers left\n",
> > - cmd->SCp.this_residual,
> > - cmd->SCp.buffers_residual);
> > - }
> > + advance_sg_buffer(cmd);
> > + dsprintk(NDEBUG_INFORMATION, instance,
> > + "this residual %d, sg ents %d\n",
> > + cmd->SCp.this_residual,
> > + sg_nents(cmd->SCp.buffer));
> >
> > /*
> > * The preferred transfer method is going to
> > be
> > @@ -2126,12 +2126,7 @@ static void NCR5380_reselect(struct Scsi_Host
> > *instance)
> > if (sun3_dma_setup_done != tmp) {
> > int count;
> >
> > - if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
> > - ++tmp->SCp.buffer;
> > - --tmp->SCp.buffers_residual;
> > - tmp->SCp.this_residual = tmp->SCp.buffer->length;
> > - tmp->SCp.ptr = sg_virt(tmp->SCp.buffer);
> > - }
> > + advance_sg_buffer(tmp);
> >
> > count = sun3scsi_dma_xfer_len(hostdata, tmp);
> >
> >
>

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