linux-kernel - [PATCH RFC v2 04/18] cxl/region: Add Dynamic Capacity decoder and region modes

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Date:   Mon, 28 Aug 2023 22:20:55 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Navneet Singh <navneet.singh@...el.com>,
        Fan Ni <fan.ni@...sung.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        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-kernel@...r.kernel.org
Subject: [PATCH RFC v2 04/18] cxl/region: Add Dynamic Capacity decoder and
 region modes

Both regions and decoders will need a new mode to reflect the new type
of partition they are targeting on a device.  Regions reflect a dynamic
capacity type which may point to different Dynamic Capacity (DC)
Regions.  Decoder mode reflects a specific DC Region.

Define the new modes to use in subsequent patches and the helper
functions associated with them.

Co-developed-by: Navneet Singh <navneet.singh@...el.com>
Signed-off-by: Navneet Singh <navneet.singh@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
Changes for v2:
[iweiny: split out from: Add dynamic capacity cxl region support.]
---
 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 75041903b72c..69af1354bc5b 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1772,6 +1772,8 @@ 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;
 }
@@ -2912,6 +2914,8 @@ cxl_decoder_to_region_mode(enum cxl_decoder_mode mode)
 		return CXL_REGION_PMEM;
 	case CXL_DECODER_DEAD:
 		return CXL_REGION_DEAD;
+	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 ed282dcd5cf5..d41f3f14fbe3 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -356,6 +356,14 @@ 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,
 };
@@ -366,6 +374,14 @@ 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",
 	};
 
@@ -374,10 +390,16 @@ 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,
 	CXL_REGION_DEAD,
 };
@@ -388,6 +410,7 @@ 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",
 	};
 

-- 
2.41.0