linux-kernel - [PATCH v6 10/27] cxl/region: Add dynamic capacity decoder and region modes

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Message-Id: <20241105-dcd-type2-upstream-v6-10-85c7fa2140fe@intel.com>
Date: Tue, 05 Nov 2024 12:38:32 -0600
From: ira.weiny@...el.com
To: Dave Jiang <dave.jiang@...el.com>, Fan Ni <fan.ni@...sung.com>, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 Navneet Singh <navneet.singh@...el.com>, Jonathan Corbet <corbet@....net>, 
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Dan Williams <dan.j.williams@...el.com>, 
 Davidlohr Bueso <dave@...olabs.net>, 
 Alison Schofield <alison.schofield@...el.com>, 
 Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, 
 linux-cxl@...r.kernel.org, linux-doc@...r.kernel.org, 
 nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Li Ming <ming4.li@...el.com>
Subject: [PATCH v6 10/27] cxl/region: Add dynamic capacity decoder and
 region modes

From: Navneet Singh <navneet.singh@...el.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 v3.1.

Define the new modes and helper functions required to make the
association between these new modes.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Fan Ni <fan.ni@...sung.com>
Signed-off-by: Navneet Singh <navneet.singh@...el.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Reviewed-by: Li Ming <ming4.li@...el.com>
Co-developed-by: Ira Weiny <ira.weiny@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 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 b3beab787faeb552850ac3839472319fcf8f2835..2ca6148d108cc020bebcb34b09028fa59bb62f02 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;
 }
@@ -3233,6 +3235,8 @@ 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 5d74eb4ffab3ea2656c8e3c0563b8d7b69d76232..f931ebdd36d05a8aa758627746f0fa425a5f14fd 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",
 	};
 

-- 
2.47.0