linux-kernel - [PATCH v1] device-dax: Adding match parameter to select which driver to match dax devices

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Date:   Mon, 28 Feb 2022 17:49:38 +0800
From:   Zhenguo Yao <yaozhenguo1@...il.com>
To:     dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com
Cc:     nvdimm@...ts.linux.dev, yaozhenguo@...com,
        linux-kernel@...r.kernel.org, Zhenguo Yao <yaozhenguo1@...il.com>
Subject: [PATCH v1] device-dax: Adding match parameter to select which driver to match dax devices

device_dax driver always match dax devices by default. The other
drivers only match devices by dax_id. There are situations which
need kmem drvier match all the dax device at boot time. So
adding a parameter to support this function.

Signed-off-by: Zhenguo Yao <yaozhenguo1@...il.com>
---
 drivers/dax/device.c | 3 +++
 drivers/dax/kmem.c   | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index dd8222a..a974cc1 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -452,6 +452,7 @@ int dev_dax_probe(struct dev_dax *dev_dax)
 }
 EXPORT_SYMBOL_GPL(dev_dax_probe);
 
+unsigned int match = 1;
 static struct dax_device_driver device_dax_driver = {
 	.probe = dev_dax_probe,
 	/* all probe actions are unwound by devm, so .remove isn't necessary */
@@ -460,6 +461,7 @@ int dev_dax_probe(struct dev_dax *dev_dax)
 
 static int __init dax_init(void)
 {
+	device_dax_driver.match_always = match;
 	return dax_driver_register(&device_dax_driver);
 }
 
@@ -468,6 +470,7 @@ static void __exit dax_exit(void)
 	dax_driver_unregister(&device_dax_driver);
 }
 
+module_param(match, uint, 0644);
 MODULE_AUTHOR("Intel Corporation");
 MODULE_LICENSE("GPL v2");
 module_init(dax_init);
diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index a376220..41ba713 100644
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -214,9 +214,11 @@ static void dev_dax_kmem_remove(struct dev_dax *dev_dax)
 }
 #endif /* CONFIG_MEMORY_HOTREMOVE */
 
+unsigned int match;
 static struct dax_device_driver device_dax_kmem_driver = {
 	.probe = dev_dax_kmem_probe,
 	.remove = dev_dax_kmem_remove,
+	.match_always = 0,
 };
 
 static int __init dax_kmem_init(void)
@@ -228,6 +230,7 @@ static int __init dax_kmem_init(void)
 	if (!kmem_name)
 		return -ENOMEM;
 
+	device_dax_kmem_driver.match_always = match;
 	rc = dax_driver_register(&device_dax_kmem_driver);
 	if (rc)
 		kfree_const(kmem_name);
@@ -241,6 +244,7 @@ static void __exit dax_kmem_exit(void)
 		kfree_const(kmem_name);
 }
 
+module_param(match, uint, 0644);
 MODULE_AUTHOR("Intel Corporation");
 MODULE_LICENSE("GPL v2");
 module_init(dax_kmem_init);
-- 
1.8.3.1