linux-kernel - RE: [PATCH 3/8] efi: Decode IA32/X64 Processor Error Info Structure

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Date:   Mon, 26 Feb 2018 16:00:12 +0000
From:   "Ghannam, Yazen" <Yazen.Ghannam@....com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
CC:     "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...e.de>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: RE: [PATCH 3/8] efi: Decode IA32/X64 Processor Error Info Structure

> -----Original Message-----
> From: Ard Biesheuvel [mailto:ard.biesheuvel@...aro.org]
> Sent: Saturday, February 24, 2018 11:40 AM
> To: Ghannam, Yazen <Yazen.Ghannam@....com>
> Cc: linux-efi@...r.kernel.org; Linux Kernel Mailing List <linux-
> kernel@...r.kernel.org>; Borislav Petkov <bp@...e.de>; the arch/x86
> maintainers <x86@...nel.org>
> Subject: Re: [PATCH 3/8] efi: Decode IA32/X64 Processor Error Info Structure
> 
...
> >
> > diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-
> x86.c
> > index b50ee3cdf637..9d608f742c98 100644
> > --- a/drivers/firmware/efi/cper-x86.c
> > +++ b/drivers/firmware/efi/cper-x86.c
> > @@ -4,15 +4,28 @@
> >
> >  #include <linux/cper.h>
> >
> > +#define INDENT_SP      " "
> > +
> >  /*
> >   * We don't need a "CPER_IA" prefix since these are all locally defined.
> >   * This will save us a lot of line space.
> >   */
> >  #define VALID_LAPIC_ID                 BIT_ULL(0)
> >  #define VALID_CPUID_INFO               BIT_ULL(1)
> > +#define VALID_PROC_ERR_INFO_NUM(bits)  ((bits & GENMASK_ULL(7, 2))
> >> 2)
> > +
> 
> Parens around 'bits' please
> 

Like this?

#define VALID_PROC_ERR_INFO_NUM(bits)  (((bits) & GENMASK_ULL(7, 2)) >> 2)

I'll do the same for the others.

> > +#define INFO_VALID_CHECK_INFO          BIT_ULL(0)
> > +#define INFO_VALID_TARGET_ID           BIT_ULL(1)
> > +#define INFO_VALID_REQUESTOR_ID                BIT_ULL(2)
> > +#define INFO_VALID_RESPONDER_ID                BIT_ULL(3)
> > +#define INFO_VALID_IP                  BIT_ULL(4)
> >
> >  void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia
> *proc)
> >  {
> > +       int i;
> > +       struct cper_ia_err_info *err_info;
> > +       char newpfx[64];
> > +
> >         printk("%sValidation Bits: 0x%016llx\n", pfx, proc->validation_bits);
> >
> >         if (proc->validation_bits & VALID_LAPIC_ID)
> > @@ -23,4 +36,44 @@ void cper_print_proc_ia(const char *pfx, const struct
> cper_sec_proc_ia *proc)
> >                 print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, proc-
> >cpuid,
> >                                sizeof(proc->cpuid), 0);
> >         }
> > +
> > +       snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
> > +
> > +       err_info = (struct cper_ia_err_info *)(proc + 1);
> > +       for (i = 0; i < VALID_PROC_ERR_INFO_NUM(proc->validation_bits); i++)
> {
> > +               printk("%sError Information Structure %d:\n", pfx, i);
> > +
> > +               printk("%sError Structure Type: %pUl\n", newpfx,
> > +                        &err_info->err_type);
> > +
> 
> The indentation is a bit awkward here. Could you please align followup
> lines with the character following the ( on the first line?
> 

Yes, will do.

> > +               printk("%sValidation Bits: 0x%016llx\n",
> > +                        newpfx, err_info->validation_bits);
> > +
> > +               if (err_info->validation_bits & INFO_VALID_CHECK_INFO) {
> > +                       printk("%sCheck Information: 0x%016llx\n", newpfx,
> > +                                err_info->check_info);
> > +               }
> > +
> > +               if (err_info->validation_bits & INFO_VALID_TARGET_ID) {
> > +                       printk("%sTarget Identifier: 0x%016llx\n",
> > +                                newpfx, err_info->target_id);
> > +               }
> > +
> > +               if (err_info->validation_bits & INFO_VALID_REQUESTOR_ID) {
> > +                       printk("%sRequestor Identifier: 0x%016llx\n",
> > +                                newpfx, err_info->requestor_id);
> > +               }
> > +
> > +               if (err_info->validation_bits & INFO_VALID_RESPONDER_ID) {
> > +                       printk("%sResponder Identifier: 0x%016llx\n",
> > +                                newpfx, err_info->responder_id);
> > +               }
> > +
> > +               if (err_info->validation_bits & INFO_VALID_IP) {
> > +                       printk("%sInstruction Pointer: 0x%016llx\n",
> > +                                newpfx, err_info->ip);
> > +               }
> > +
> > +               err_info++;
> > +       }
> >  }
> > --
> > 2.14.1
> >