linux-kernel - [PATCH 05/11] cxl/core: Introduce cxl_set_lock

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Message-ID: <164610295699.2682974.3646198829625502263.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Mon, 28 Feb 2022 18:49:17 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     gregkh@...uxfoundation.org, rafael.j.wysocki@...el.com
Cc:     Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <ben.widawsky@...el.com>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
        nvdimm@...ts.linux.dev
Subject: [PATCH 05/11] cxl/core: Introduce cxl_set_lock_class()

Update CONFIG_PROVE_CXL_LOCKING to use the common device-core helpers
for device_lock validation.

When CONFIG_PROVE_LOCKING is enabled and device_set_lock_class() is
passed a non-zero lock class the core acquires the 'struct device'
@lockdep_mutex everywhere it acquires the device_lock. Where
lockdep_mutex does not skip lockdep validation like device_lock.

cxl_set_lock_class() wraps device_set_lock_class() as to not collide
with other subsystems that may also support this lockdep validation
scheme. See the 'choice' for the various CONFIG_PROVE_$SUBSYS_LOCKING
options in lib/Kconfig.debug.

Cc: Alison Schofield <alison.schofield@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: Ira Weiny <ira.weiny@...el.com>
Cc: Ben Widawsky <ben.widawsky@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/cxl/core/memdev.c |    1 +
 drivers/cxl/core/pmem.c   |    2 ++
 drivers/cxl/core/port.c   |    2 ++
 drivers/cxl/core/region.c |    1 +
 drivers/cxl/cxl.h         |    9 +++++++++
 5 files changed, 15 insertions(+)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 1f76b28f9826..ad8c9f61c38a 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -343,6 +343,7 @@ struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds)
 	cxlmd->cxlds = cxlds;
 
 	cdev = &cxlmd->cdev;
+	cxl_set_lock_class(dev);
 	rc = cdev_device_add(cdev, dev);
 	if (rc)
 		goto err;
diff --git a/drivers/cxl/core/pmem.c b/drivers/cxl/core/pmem.c
index c3d7e6ce3fdf..e0bdda788b01 100644
--- a/drivers/cxl/core/pmem.c
+++ b/drivers/cxl/core/pmem.c
@@ -171,6 +171,7 @@ struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host,
 	if (rc)
 		goto err;
 
+	cxl_set_lock_class(dev);
 	rc = device_add(dev);
 	if (rc)
 		goto err;
@@ -283,6 +284,7 @@ int devm_cxl_add_nvdimm(struct device *host, struct cxl_memdev *cxlmd)
 	if (rc)
 		goto err;
 
+	cxl_set_lock_class(dev);
 	rc = device_add(dev);
 	if (rc)
 		goto err;
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 44006d8eb64d..5eee7de1c7f9 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -507,6 +507,7 @@ struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport,
 	if (rc)
 		goto err;
 
+	cxl_set_lock_class(dev);
 	rc = device_add(dev);
 	if (rc)
 		goto err;
@@ -1389,6 +1390,7 @@ int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map)
 	if (is_root_decoder(dev))
 		cxld->platform_res.name = dev_name(dev);
 
+	cxl_set_lock_class(dev);
 	return device_add(dev);
 }
 EXPORT_SYMBOL_NS_GPL(cxl_decoder_add_locked, CXL);
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index b1a4ba622739..f0a821de94cf 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -476,6 +476,7 @@ int cxl_add_region(struct cxl_decoder *cxld, struct cxl_region *cxlr)
 	if (rc)
 		goto err;
 
+	cxl_set_lock_class(dev);
 	rc = device_add(dev);
 	if (rc)
 		goto err;
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 1357a245037d..f94eff659cce 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -543,5 +543,14 @@ static inline int cxl_lock_class(struct device *dev)
 	else
 		return CXL_ANON_LOCK;
 }
+
+static inline void cxl_set_lock_class(struct device *dev)
+{
+	device_set_lock_class(dev, cxl_lock_class(dev));
+}
+#else
+static inline void cxl_set_lock_class(struct device *dev)
+{
+}
 #endif
 #endif /* __CXL_H__ */