On 8/16/24 7:44 AM, ira.we...@intel.com wrote:
> From: Navneet Singh <navneet.si...@intel.com>
> 
> One or more decoders each pointing to a Dynamic Capacity (DC) partition
> form a CXL software region.  The region mode reflects composition of
> that entire software region.  Decoder mode reflects a specific DC
> partition.  DC partitions are also known as DC regions per CXL
> specification r3.1.
> 
> Define the new modes and helper functions required to make the
> association between these new modes.
> 
> Reviewed-by: Jonathan Cameron <jonathan.came...@huawei.com>
> Reviewed-by: Fan Ni <fan...@samsung.com>
> Signed-off-by: Navneet Singh <navneet.si...@intel.com>
> Co-developed-by: Ira Weiny <ira.we...@intel.com>
> Signed-off-by: Ira Weiny <ira.we...@intel.com>

Reviewed-by: Dave Jiang <dave.ji...@intel.com>
> 
> ---
> Changes:
> [iweiny: keep tags on simple patch]
> [Fan: s/partitions/partition/]
> [djiang: New wording for the commit message]
> [iweiny: reword commit message more]
> ---
>  drivers/cxl/core/region.c |  4 ++++
>  drivers/cxl/cxl.h         | 23 +++++++++++++++++++++++
>  2 files changed, 27 insertions(+)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index 796e5a791e44..650fe33f2ed4 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -1870,6 +1870,8 @@ static bool cxl_modes_compatible(enum cxl_region_mode 
> rmode,
>               return true;
>       if (rmode == CXL_REGION_PMEM && dmode == CXL_DECODER_PMEM)
>               return true;
> +     if (rmode == CXL_REGION_DC && cxl_decoder_mode_is_dc(dmode))
> +             return true;
>  
>       return false;
>  }
> @@ -3239,6 +3241,8 @@ cxl_decoder_to_region_mode(enum cxl_decoder_mode mode)
>               return CXL_REGION_RAM;
>       case CXL_DECODER_PMEM:
>               return CXL_REGION_PMEM;
> +     case CXL_DECODER_DC0 ... CXL_DECODER_DC7:
> +             return CXL_REGION_DC;
>       case CXL_DECODER_MIXED:
>       default:
>               return CXL_REGION_MIXED;
> diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
> index f766b2a8bf53..d2674ab46f35 100644
> --- a/drivers/cxl/cxl.h
> +++ b/drivers/cxl/cxl.h
> @@ -370,6 +370,14 @@ enum cxl_decoder_mode {
>       CXL_DECODER_NONE,
>       CXL_DECODER_RAM,
>       CXL_DECODER_PMEM,
> +     CXL_DECODER_DC0,
> +     CXL_DECODER_DC1,
> +     CXL_DECODER_DC2,
> +     CXL_DECODER_DC3,
> +     CXL_DECODER_DC4,
> +     CXL_DECODER_DC5,
> +     CXL_DECODER_DC6,
> +     CXL_DECODER_DC7,
>       CXL_DECODER_MIXED,
>       CXL_DECODER_DEAD,
>  };
> @@ -380,6 +388,14 @@ static inline const char *cxl_decoder_mode_name(enum 
> cxl_decoder_mode mode)
>               [CXL_DECODER_NONE] = "none",
>               [CXL_DECODER_RAM] = "ram",
>               [CXL_DECODER_PMEM] = "pmem",
> +             [CXL_DECODER_DC0] = "dc0",
> +             [CXL_DECODER_DC1] = "dc1",
> +             [CXL_DECODER_DC2] = "dc2",
> +             [CXL_DECODER_DC3] = "dc3",
> +             [CXL_DECODER_DC4] = "dc4",
> +             [CXL_DECODER_DC5] = "dc5",
> +             [CXL_DECODER_DC6] = "dc6",
> +             [CXL_DECODER_DC7] = "dc7",
>               [CXL_DECODER_MIXED] = "mixed",
>       };
>  
> @@ -388,10 +404,16 @@ static inline const char *cxl_decoder_mode_name(enum 
> cxl_decoder_mode mode)
>       return "mixed";
>  }
>  
> +static inline bool cxl_decoder_mode_is_dc(enum cxl_decoder_mode mode)
> +{
> +     return (mode >= CXL_DECODER_DC0 && mode <= CXL_DECODER_DC7);
> +}
> +
>  enum cxl_region_mode {
>       CXL_REGION_NONE,
>       CXL_REGION_RAM,
>       CXL_REGION_PMEM,
> +     CXL_REGION_DC,
>       CXL_REGION_MIXED,
>  };
>  
> @@ -401,6 +423,7 @@ static inline const char *cxl_region_mode_name(enum 
> cxl_region_mode mode)
>               [CXL_REGION_NONE] = "none",
>               [CXL_REGION_RAM] = "ram",
>               [CXL_REGION_PMEM] = "pmem",
> +             [CXL_REGION_DC] = "dc",
>               [CXL_REGION_MIXED] = "mixed",
>       };
>  
> 

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