linux-kernel - [PATCH v5 06/27] cxl/region: Refactor common create region code

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Message-Id: <20241029-dcd-type2-upstream-v5-6-8739cb67c374@intel.com>
Date: Tue, 29 Oct 2024 15:34:41 -0500
From: Ira Weiny <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 v5 06/27] cxl/region: Refactor common create region code

create_pmem_region_store() and create_ram_region_store() are identical
with the exception of the region mode.  With the addition of DC region
mode this would end up being 3 copies of the same code.

Refactor create_pmem_region_store() and create_ram_region_store() to use
a single common function to be used in subsequent DC code.

Suggested-by: Fan Ni <fan.ni@...sung.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Fan Ni <fan.ni@...sung.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Reviewed-by: Li Ming <ming4.li@...el.com>
Reviewed-by: Alison Schofield <alison.schofield@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
NOTE: the tags were kept even though the region/decoder mode had to be
adjusted to move the patch earlier in the series.

Changes:
[Jonathan: Move forward in series to pick up early]
[iweiny: Adjust to be ahead of region/decoder mode change]
---
 drivers/cxl/core/region.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index e701e4b0403282a06bccfbca6bf212fd35e3a64c..02437e716b7e04493bb7a2b7d14649a2414c1cb7 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2536,9 +2536,8 @@ static struct cxl_region *__create_region(struct cxl_root_decoder *cxlrd,
 	return devm_cxl_add_region(cxlrd, id, mode, CXL_DECODER_HOSTONLYMEM);
 }
 
-static ssize_t create_pmem_region_store(struct device *dev,
-					struct device_attribute *attr,
-					const char *buf, size_t len)
+static ssize_t create_region_store(struct device *dev, const char *buf,
+				   size_t len, enum cxl_decoder_mode mode)
 {
 	struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev);
 	struct cxl_region *cxlr;
@@ -2548,31 +2547,26 @@ static ssize_t create_pmem_region_store(struct device *dev,
 	if (rc != 1)
 		return -EINVAL;
 
-	cxlr = __create_region(cxlrd, CXL_DECODER_PMEM, id);
+	cxlr = __create_region(cxlrd, mode, id);
 	if (IS_ERR(cxlr))
 		return PTR_ERR(cxlr);
 
 	return len;
 }
+
+static ssize_t create_pmem_region_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	return create_region_store(dev, buf, len, CXL_DECODER_PMEM);
+}
 DEVICE_ATTR_RW(create_pmem_region);
 
 static ssize_t create_ram_region_store(struct device *dev,
 				       struct device_attribute *attr,
 				       const char *buf, size_t len)
 {
-	struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev);
-	struct cxl_region *cxlr;
-	int rc, id;
-
-	rc = sscanf(buf, "region%d\n", &id);
-	if (rc != 1)
-		return -EINVAL;
-
-	cxlr = __create_region(cxlrd, CXL_DECODER_RAM, id);
-	if (IS_ERR(cxlr))
-		return PTR_ERR(cxlr);
-
-	return len;
+	return create_region_store(dev, buf, len, CXL_DECODER_RAM);
 }
 DEVICE_ATTR_RW(create_ram_region);
 

-- 
2.47.0