Re: [Xen-devel] [PATCH v4 21/24] tools: L2 CAT: support get HW info for L2 CAT.

[Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>]

On 17-01-06 12:04:36, Wei Liu wrote:
> On Wed, Dec 14, 2016 at 12:08:01PM +0800, Yi Sun wrote:
> > This patch implements xl/xc changes to support get HW info
> > for L2 CAT.
> > 
> > 'xl psr-hwinfo' is updated to show both L3 CAT and L2 CAT
> > info.
> > 
> > Example(on machine which only supports L2 CAT):
> > Cache Monitoring Technology (CMT):
> > Enabled         : 0
> > Cache Allocation Technology (CAT): L3
> > libxl: error: libxl_psr.c:100:libxl__psr_cat_log_err_msg: CAT is not 
> > enabled on the socket: No such file or directory
> > Failed to get l3 cat info
> 
> What is this?
> 
The psr-hwinfo prints all features out by design. This test was executed on a
machine which only supports L2 CAT. So, the L3 CAT not supported info will be
printed out.

> > Signed-off-by: He Chen <he.chen@xxxxxxxxxxxxxxx>
> > Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
> > ---
> >  tools/libxc/include/xenctrl.h |  6 +++---
> >  tools/libxc/xc_psr.c          | 40 +++++++++++++++++++++++-----------
> >  tools/libxl/libxl.h           | 11 ++++++++--
> >  tools/libxl/libxl_psr.c       |  8 +++----
> >  tools/libxl/xl_cmdimpl.c      | 50 
> > +++++++++++++++++++++++++++++++++++--------
> >  5 files changed, 85 insertions(+), 30 deletions(-)
> > 
> > diff --git a/tools/libxc/xc_psr.c b/tools/libxc/xc_psr.c
> > index 43b3286..7af17d9 100644
> > --- a/tools/libxc/xc_psr.c
> > +++ b/tools/libxc/xc_psr.c
> > +        if ( !rc )
> > +        {
> > +            *cos_max = sysctl.u.psr_cat_op.u.l3_info.cos_max;
> > +            *cbm_len = sysctl.u.psr_cat_op.u.l3_info.cbm_len;
> > +            *cdp_enabled = sysctl.u.psr_cat_op.u.l3_info.flags &
> > +                           XEN_SYSCTL_PSR_CAT_L3_CDP;
> > +        }
> > +        break;
> > +    default:
> > +        errno = EOPNOTSUPP;
> > +        return rc;
> 
> There is no need for "return rc".
> 
Thanks!

> >      }
> >  
> >      return rc;
> > diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
> > index acbf476..9233b0f 100644
> > --- a/tools/libxl/libxl.h
> > +++ b/tools/libxl/libxl.h
> > @@ -904,6 +904,13 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, 
> > const libxl_mac *src);
> >   * If this is defined, the Code and Data Prioritization feature is 
> > supported.
> >   */
> >  #define LIBXL_HAVE_PSR_CDP 1
> > +
> > +/*
> > + * LIBXL_HAVE_PSR_L2_CAT
> > + *
> > + * If this is defined, the L2 Cache Allocation Technology feature is 
> > supported.
> > + */
> > +#define LIBXL_HAVE_PSR_L2_CAT 1
> >  #endif
> >  
> >  /*
> > @@ -2159,8 +2166,8 @@ int libxl_psr_cat_get_cbm(libxl_ctx *ctx, uint32_t 
> > domid,
> >   * On success, the function returns an array of elements in 'info',
> >   * and the length in 'nr'.
> >   */
> > -int libxl_psr_cat_get_l3_info(libxl_ctx *ctx, libxl_psr_cat_info **info,
> > -                              int *nr);
> > +int libxl_psr_cat_get_info(libxl_ctx *ctx, libxl_psr_cat_info **info,
> > +                           int *nr, unsigned int lvl);
> 
> You can't delete old public functions. They will basically stay there
> forever.
> 
> Please refactor the code to support both the new functions and the old.
> In this particular case, it would be easy to implement _get_l3_info with
> _get_info.
> 
> Wei.

Got it. I will refactor codes to keep the old interfaces. Thank you!

Sun Yi

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