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


From: Klaus Birkelund Jensen
Subject: Re: [PATCH v6 12/42] nvme: add support for the get log page command
Date: Tue, 31 Mar 2020 07:41:09 +0200

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.

> 
> > +
> > +    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
> 




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