linux-kernel - [PATCH 1/2] libnvdimm/of_pmem: handle memory-region in DT

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Date:   Sat, 22 Feb 2020 10:30:09 -0800
From:   Alistair Delva <adelva@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Kenny Root <kroot@...gle.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>, devicetree@...r.kernel.org,
        linux-nvdimm@...ts.01.org, kernel-team@...roid.com
Subject: [PATCH 1/2] libnvdimm/of_pmem: handle memory-region in DT

From: Kenny Root <kroot@...gle.com>

Add support for parsing the 'memory-region' DT property in addition to
the 'reg' DT property. This enables use cases where the pmem region is
not in I/O address space or dedicated memory (e.g. a bootloader
carveout).

Signed-off-by: Kenny Root <kroot@...gle.com>
Signed-off-by: Alistair Delva <adelva@...gle.com>
Cc: "Oliver O'Halloran" <oohall@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Ira Weiny <ira.weiny@...el.com>
Cc: devicetree@...r.kernel.org
Cc: linux-nvdimm@...ts.01.org
Cc: kernel-team@...roid.com
---
 drivers/nvdimm/of_pmem.c | 75 ++++++++++++++++++++++++++--------------
 1 file changed, 50 insertions(+), 25 deletions(-)

diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
index 8224d1431ea9..a68e44fb0041 100644
--- a/drivers/nvdimm/of_pmem.c
+++ b/drivers/nvdimm/of_pmem.c
@@ -14,13 +14,47 @@ struct of_pmem_private {
 	struct nvdimm_bus *bus;
 };
 
+static void of_pmem_register_region(struct platform_device *pdev,
+				    struct nvdimm_bus *bus,
+				    struct device_node *np,
+				    struct resource *res, bool is_volatile)
+{
+	struct nd_region_desc ndr_desc;
+	struct nd_region *region;
+
+	/*
+	 * NB: libnvdimm copies the data from ndr_desc into it's own
+	 * structures so passing a stack pointer is fine.
+	 */
+	memset(&ndr_desc, 0, sizeof(ndr_desc));
+	ndr_desc.numa_node = dev_to_node(&pdev->dev);
+	ndr_desc.target_node = ndr_desc.numa_node;
+	ndr_desc.res = res;
+	ndr_desc.of_node = np;
+	set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
+
+	if (is_volatile)
+		region = nvdimm_volatile_region_create(bus, &ndr_desc);
+	else
+		region = nvdimm_pmem_region_create(bus, &ndr_desc);
+
+	if (!region)
+		dev_warn(&pdev->dev,
+			 "Unable to register region %pR from %pOF\n",
+			 ndr_desc.res, np);
+	else
+		dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
+			ndr_desc.res, np);
+}
+
 static int of_pmem_region_probe(struct platform_device *pdev)
 {
 	struct of_pmem_private *priv;
-	struct device_node *np;
+	struct device_node *mrp, *np;
 	struct nvdimm_bus *bus;
+	struct resource res;
 	bool is_volatile;
-	int i;
+	int i, ret;
 
 	np = dev_of_node(&pdev->dev);
 	if (!np)
@@ -46,31 +80,22 @@ static int of_pmem_region_probe(struct platform_device *pdev)
 			is_volatile ? "volatile" : "non-volatile",  np);
 
 	for (i = 0; i < pdev->num_resources; i++) {
-		struct nd_region_desc ndr_desc;
-		struct nd_region *region;
-
-		/*
-		 * NB: libnvdimm copies the data from ndr_desc into it's own
-		 * structures so passing a stack pointer is fine.
-		 */
-		memset(&ndr_desc, 0, sizeof(ndr_desc));
-		ndr_desc.numa_node = dev_to_node(&pdev->dev);
-		ndr_desc.target_node = ndr_desc.numa_node;
-		ndr_desc.res = &pdev->resource[i];
-		ndr_desc.of_node = np;
-		set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
-
-		if (is_volatile)
-			region = nvdimm_volatile_region_create(bus, &ndr_desc);
-		else
-			region = nvdimm_pmem_region_create(bus, &ndr_desc);
+		of_pmem_register_region(pdev, bus, np, &pdev->resource[i],
+					is_volatile);
+	}
 
-		if (!region)
-			dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
-					ndr_desc.res, np);
+	i = 0;
+	while ((mr_np = of_parse_phandle(np, "memory-region", i++))) {
+		ret = of_address_to_resource(mr_np, 0, &res);
+		if (ret)
+			dev_warn(
+				&pdev->dev,
+				"Unable to acquire memory-region from %pOF: %d\n",
+				mr_np, ret);
 		else
-			dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
-					ndr_desc.res, np);
+			of_pmem_register_region(pdev, bus, np, &res,
+						is_volatile);
+		of_node_put(mr_np);
 	}
 
 	return 0;
-- 
2.25.0.265.gbab2e86ba0-goog