diff mbox series

[v5,20/27] cxl/region: factor out interleave ways setup

Message ID 20241118164434.7551-21-alejandro.lucero-palau@amd.com
State New
Headers show
Series cxl: add type2 device basic support | expand

Commit Message

Lucero Palau, Alejandro Nov. 18, 2024, 4:44 p.m. UTC 
From: Alejandro Lucero <alucerop@amd.com>

In preparation for kernel driven region creation, factor out a common
helper from the user-sysfs region setup for interleave ways.

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
Co-developed-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/cxl/core/region.c | 46 +++++++++++++++++++++++----------------
 1 file changed, 27 insertions(+), 19 deletions(-)

Comments

Zhi Wang Nov. 19, 2024, 8:20 p.m. UTC | #1 
On Mon, 18 Nov 2024 16:44:27 +0000
<alejandro.lucero-palau@amd.com> wrote:

LGTM. Reviewed-by: Zhi Wang <zhiw@nvidia.com>

> From: Alejandro Lucero <alucerop@amd.com>
> 
> In preparation for kernel driven region creation, factor out a common
> helper from the user-sysfs region setup for interleave ways.
> 
> Signed-off-by: Alejandro Lucero <alucerop@amd.com>
> Co-developed-by: Dan Williams <dan.j.williams@intel.com>
> ---
>  drivers/cxl/core/region.c | 46
> +++++++++++++++++++++++---------------- 1 file changed, 27
> insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index 8e2dbd15cfc0..04f82adb763f 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -464,22 +464,14 @@ static ssize_t interleave_ways_show(struct
> device *dev, 
>  static const struct attribute_group
> *get_cxl_region_target_group(void); 
> -static ssize_t interleave_ways_store(struct device *dev,
> -				     struct device_attribute *attr,
> -				     const char *buf, size_t len)
> +static int set_interleave_ways(struct cxl_region *cxlr, int val)
>  {
> -	struct cxl_root_decoder *cxlrd =
> to_cxl_root_decoder(dev->parent);
> +	struct cxl_root_decoder *cxlrd =
> to_cxl_root_decoder(cxlr->dev.parent); struct cxl_decoder *cxld =
> &cxlrd->cxlsd.cxld;
> -	struct cxl_region *cxlr = to_cxl_region(dev);
>  	struct cxl_region_params *p = &cxlr->params;
> -	unsigned int val, save;
> -	int rc;
> +	int save, rc;
>  	u8 iw;
>  
> -	rc = kstrtouint(buf, 0, &val);
> -	if (rc)
> -		return rc;
> -
>  	rc = ways_to_eiw(val, &iw);
>  	if (rc)
>  		return rc;
> @@ -494,20 +486,36 @@ static ssize_t interleave_ways_store(struct
> device *dev, return -EINVAL;
>  	}
>  
> -	rc = down_write_killable(&cxl_region_rwsem);
> -	if (rc)
> -		return rc;
> -	if (p->state >= CXL_CONFIG_INTERLEAVE_ACTIVE) {
> -		rc = -EBUSY;
> -		goto out;
> -	}
> +	lockdep_assert_held_write(&cxl_region_rwsem);
> +	if (p->state >= CXL_CONFIG_INTERLEAVE_ACTIVE)
> +		return -EBUSY;
>  
>  	save = p->interleave_ways;
>  	p->interleave_ways = val;
>  	rc = sysfs_update_group(&cxlr->dev.kobj,
> get_cxl_region_target_group()); if (rc)
>  		p->interleave_ways = save;
> -out:
> +
> +	return rc;
> +}
> +
> +static ssize_t interleave_ways_store(struct device *dev,
> +				     struct device_attribute *attr,
> +				     const char *buf, size_t len)
> +{
> +	struct cxl_region *cxlr = to_cxl_region(dev);
> +	unsigned int val;
> +	int rc;
> +
> +	rc = kstrtouint(buf, 0, &val);
> +	if (rc)
> +		return rc;
> +
> +	rc = down_write_killable(&cxl_region_rwsem);
> +	if (rc)
> +		return rc;
> +
> +	rc = set_interleave_ways(cxlr, val);
>  	up_write(&cxl_region_rwsem);
>  	if (rc)
>  		return rc;
diff mbox series

Patch

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 8e2dbd15cfc0..04f82adb763f 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -464,22 +464,14 @@  static ssize_t interleave_ways_show(struct device *dev,
 
 static const struct attribute_group *get_cxl_region_target_group(void);
 
-static ssize_t interleave_ways_store(struct device *dev,
-				     struct device_attribute *attr,
-				     const char *buf, size_t len)
+static int set_interleave_ways(struct cxl_region *cxlr, int val)
 {
-	struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev->parent);
+	struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(cxlr->dev.parent);
 	struct cxl_decoder *cxld = &cxlrd->cxlsd.cxld;
-	struct cxl_region *cxlr = to_cxl_region(dev);
 	struct cxl_region_params *p = &cxlr->params;
-	unsigned int val, save;
-	int rc;
+	int save, rc;
 	u8 iw;
 
-	rc = kstrtouint(buf, 0, &val);
-	if (rc)
-		return rc;
-
 	rc = ways_to_eiw(val, &iw);
 	if (rc)
 		return rc;
@@ -494,20 +486,36 @@  static ssize_t interleave_ways_store(struct device *dev,
 		return -EINVAL;
 	}
 
-	rc = down_write_killable(&cxl_region_rwsem);
-	if (rc)
-		return rc;
-	if (p->state >= CXL_CONFIG_INTERLEAVE_ACTIVE) {
-		rc = -EBUSY;
-		goto out;
-	}
+	lockdep_assert_held_write(&cxl_region_rwsem);
+	if (p->state >= CXL_CONFIG_INTERLEAVE_ACTIVE)
+		return -EBUSY;
 
 	save = p->interleave_ways;
 	p->interleave_ways = val;
 	rc = sysfs_update_group(&cxlr->dev.kobj, get_cxl_region_target_group());
 	if (rc)
 		p->interleave_ways = save;
-out:
+
+	return rc;
+}
+
+static ssize_t interleave_ways_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t len)
+{
+	struct cxl_region *cxlr = to_cxl_region(dev);
+	unsigned int val;
+	int rc;
+
+	rc = kstrtouint(buf, 0, &val);
+	if (rc)
+		return rc;
+
+	rc = down_write_killable(&cxl_region_rwsem);
+	if (rc)
+		return rc;
+
+	rc = set_interleave_ways(cxlr, val);
 	up_write(&cxl_region_rwsem);
 	if (rc)
 		return rc;