On Wed, 2015-08-05 at 17:30 -0500, Matthew R. Ochs wrote:
> Hi Brian,
>
> Thanks for reviewing. Comments inline below.
>
>
> -matt
>
> > On Aug 5, 2015, at 11:04 AM, Brian King <brk...@linux.vnet.ibm.com> wrote:
> >
> > On 08/02/2015 11:33 PM, Matthew R. Ochs wrote:
> >
> >> diff --git a/drivers/scsi/cxlflash/common.h
> >> b/drivers/scsi/cxlflash/common.h
> >> index ba070a5..3d6217a 100644
> >> --- a/drivers/scsi/cxlflash/common.h
> >> +++ b/drivers/scsi/cxlflash/common.h
> >> @@ -76,6 +76,12 @@ enum cxlflash_init_state {
> >> INIT_STATE_SCSI
> >> };
> >>
> >> +enum eeh_state {
> >> + EEH_STATE_NONE,
> >> + EEH_STATE_ACTIVE,
> >> + EEH_STATE_FAILED
> >> +};
> >
> > Can you use pdev->error_state and pci_channel_offline instead of
> > duplicating this
> > state information in a private driver definition?
>
> Makes sense, I’ll look into this.
>
I don't think my vPHB code propagates error_state yet. I'll check, and
if necessary, push a patch and fold it into my v3.
Regards
Daniel
> >>
> >> +#ifdef CONFIG_CXL_EEH
> >> + cxl_perst_reloads_same_image(afu, val)
> >> +#endif
> >
> > I'd suggest moving this to a .h and defining the function as a noop there
> > if appropriate, something
> > like:
> >
> > #ifndef CONFIG_CXL_EEH
> > #define cxl_perst_reloads_same_image(cfg->cxl_afu, true) do { } while(0)
> > #endif
>
> Done.
>
> >>
> >> - rcr = afu_reset(cfg);
> >> - if (rcr == 0)
> >> - rc = SUCCESS;
> >> - else
> >> - rc = FAILED;
> >> + switch (cfg->eeh_active) {
> >> + case EEH_STATE_NONE:
> >> + cfg->eeh_active = EEH_STATE_FAILED;
> >
> > Seems a little strange to be messing with the EEH state machine here when
> > EEH isn't even at play.
> > If you can't switch to use the existing EEH state machine in the pdev
> > struct, suggest renaming
> > this internal state machine to something more accurate and using the pdev
> > EEH state machine where you can.
> > Same goes for the eeh_waitq…
>
> I do agree that this is a bit strange. What we’re doing here is borrowing the
> framework we
> put in place to quiesce user contexts and hold off new threads coming in
> during an EEH
> event. I’ll look into how we can refactor this given that we’re going to move
> to using the
> existing EEH state machine (pdev->error_state) and will no longer be able to
> toggle state.
>
> >> + pr_debug("%s: pdev=%p state=%u\n", __func__, pdev, state);
> >> +
> >> + switch (state) {
> >> + case pci_channel_io_frozen:
> >> + cfg->eeh_active = EEH_STATE_ACTIVE;
> >> + udelay(100);
> >> +
> >
> > I think this udelay needs a comment…
>
> This may end up going away. I’ll add a comment if we keep it.
>
> > I'd suggest calling scsi_block_requests here to stop your queuecommand
> > function from being called.
> > Note that this won't stop EH commands from being sent, so you will still
> > need to check this
> > in queuecommand, although the right thing to do may be to fix
> > scsi_send_eh_cmnd to not call
> > queuecommand if the host is blocked.
> >
> > You’d then need to call scsi_unblock_requests when EEH in the perm failure
> > and resume cases.
>
> Good suggestion, we’ll look at adding this in.
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