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Re: [PATCH v6 12/42] nvme: add support for the get log page command


From: Maxim Levitsky
Subject: Re: [PATCH v6 12/42] nvme: add support for the get log page command
Date: Tue, 31 Mar 2020 12:45:55 +0300

On Tue, 2020-03-31 at 07:41 +0200, Klaus Birkelund Jensen wrote:
> On Mar 25 12:40, Maxim Levitsky wrote:
> > On Mon, 2020-03-16 at 07:28 -0700, Klaus Jensen wrote:
> > > From: Klaus Jensen <address@hidden>
> > > 
> > > Add support for the Get Log Page command and basic implementations of
> > > the mandatory Error Information, SMART / Health Information and Firmware
> > > Slot Information log pages.
> > > 
> > > In violation of the specification, the SMART / Health Information log
> > > page does not persist information over the lifetime of the controller
> > > because the device has no place to store such persistent state.
> > > 
> > > Note that the LPA field in the Identify Controller data structure
> > > intentionally has bit 0 cleared because there is no namespace specific
> > > information in the SMART / Health information log page.
> > > 
> > > Required for compliance with NVMe revision 1.2.1. See NVM Express 1.2.1,
> > > Section 5.10 ("Get Log Page command").
> > > 
> > > Signed-off-by: Klaus Jensen <address@hidden>
> > > Acked-by: Keith Busch <address@hidden>
> > > ---
> > >  hw/block/nvme.c       | 138 +++++++++++++++++++++++++++++++++++++++++-
> > >  hw/block/nvme.h       |  10 +++
> > >  hw/block/trace-events |   2 +
> > >  3 files changed, 149 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> > > index 64c42101df5c..83ff3fbfb463 100644
> > > 
> > > +static uint16_t nvme_error_info(NvmeCtrl *n, NvmeCmd *cmd, uint32_t 
> > > buf_len,
> > > +                                uint64_t off, NvmeRequest *req)
> > > +{
> > > +    uint32_t trans_len;
> > > +    uint64_t prp1 = le64_to_cpu(cmd->dptr.prp1);
> > > +    uint64_t prp2 = le64_to_cpu(cmd->dptr.prp2);
> > > +    uint8_t errlog[64];
> > 
> > I'll would replace this with sizeof(NvmeErrorLogEntry)
> > (and add NvmeErrorLogEntry to the nvme.h), just for the sake of consistency,
> > and in case we end up reporting some errors to the log in the future.
> > 
> 
> NvmeErrorLog is already in nvme.h; Fixed to actually use it.
True that! I'll would rename it to NvmeErrorLogEntry to be honest
(in that patch that added many nvme spec changes) but I don't mind
keeping it as is as well.


> 
> > 
> > > +
> > > +    if (off > sizeof(errlog)) {
> > > +        return NVME_INVALID_FIELD | NVME_DNR;
> > > +    }
> > > +
> > > +    memset(errlog, 0x0, sizeof(errlog));
> > > +
> > > +    trans_len = MIN(sizeof(errlog) - off, buf_len);
> > > +
> > > +    return nvme_dma_read_prp(n, errlog, trans_len, prp1, prp2);
> > > +}
> > 
> > Besides this, looks good now.
> > 
> > 
> > Best regards,
> >     Maxim Levitsky
> > 
> 
> 

Best regards,   
        Maxim Levitsky





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