The FPGA region class driver data structure is being treated as a
managed resource instead of using the standard dev_release call-back
function to release the class data structure. This change removes the
managed resource code and combines the create() and register()
functions into a single register() or register_simple() function.
The register() function accepts an info data structure to provide
flexibility in passing optional parameters. The register_simple()
function supports the current parameter list for users that don't
require the use of optional parameters.
Signed-off-by: Russ Weight <russell.h.weight@xxxxxxxxx>
Reviewed-by: Xu Yilun <yilun.xu@xxxxxxxxx>
---
v9:
- Cleaned up documentation for the FPGA Region register functions
- Renamed fpga_region_register() to fpga_region_register_full()
- Renamed fpga_region_register_simple() to fpga_region_register()
v8:
- Added reviewed-by tag.
- Updated Documentation/driver-api/fpga/fpga-region.rst documentation.
v7:
- Update the commit message to describe the new parameters for the
fpga_region_register() function and to mention the
fpga_region_register_simple() function.
- Fix function prototypes in header file to rename dev to parent.
- Some cleanup of comments.
- Update function defintions/prototypes to apply const to the new info
parameter.
- Verify a non-null info pointer in the register() functions.
v6:
- Moved FPGA manager optional parameters out of the ops structure and
back into the FPGA Region structure.
- Changed fpga_region_register() parameters to accept an info data
structure to provide flexibility in passing optional parameters.
- Added fpga_region_register_simple() functions to support current
parameters for users that don't require the use of optional parameters.
v5:
- Rebased on top of recently accepted patches.
- Created the fpga_region_ops data structure which is optionally passed
to fpga_region_register(). compat_id, the get_bridges() pointer, and
the priv pointer are included in the fpga_region_ops structure.
v4:
- Added the compat_id parameter to fpga_region_register() to ensure
that the compat_id is set before the device_register() call.
- Modified the dfl_fpga_feature_devs_enumerate() function to restore
the fpga_region_register() call to the correct location.
v3:
- Cleaned up comment header for fpga_region_register()
- Fix fpga_region_register() error return on ida_simple_get() failure
v2:
- No changes
---
Documentation/driver-api/fpga/fpga-region.rst | 8 +-
drivers/fpga/dfl-fme-region.c | 17 ++-
drivers/fpga/dfl.c | 12 +-
drivers/fpga/fpga-region.c | 119 +++++++-----------
drivers/fpga/of-fpga-region.c | 10 +-
include/linux/fpga/fpga-region.h | 36 ++++--
6 files changed, 91 insertions(+), 111 deletions(-)
diff --git a/Documentation/driver-api/fpga/fpga-region.rst b/Documentation/driver-api/fpga/fpga-region.rst
index 2636a27c11b2..904518190bb4 100644
--- a/Documentation/driver-api/fpga/fpga-region.rst
+++ b/Documentation/driver-api/fpga/fpga-region.rst
@@ -46,8 +46,10 @@ API to add a new FPGA region
----------------------------
* struct fpga_region - The FPGA region struct
-* devm_fpga_region_create() - Allocate and init a region struct
-* fpga_region_register() - Register an FPGA region
+* fpga_region_register_full() - Create and register an FPGA region using the
+ fpga_region_info structure to provide the full flexibility of options
+* fpga_region_register() - Create and register an FPGA region using standard
+ arguments
* fpga_region_unregister() - Unregister an FPGA region
The FPGA region's probe function will need to get a reference to the FPGA
@@ -76,7 +78,7 @@ following APIs to handle building or tearing down that list.
:functions: fpga_region
.. kernel-doc:: drivers/fpga/fpga-region.c
- :functions: devm_fpga_region_create
+ :functions: fpga_region_register_full
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: fpga_region_register
diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c
index 1eeb42af1012..4aebde0a7f1c 100644
--- a/drivers/fpga/dfl-fme-region.c
+++ b/drivers/fpga/dfl-fme-region.c
@@ -30,6 +30,7 @@ static int fme_region_get_bridges(struct fpga_region *region)
static int fme_region_probe(struct platform_device *pdev)
{
struct dfl_fme_region_pdata *pdata = dev_get_platdata(&pdev->dev);
+ struct fpga_region_info info = { 0 };
struct device *dev = &pdev->dev;
struct fpga_region *region;
struct fpga_manager *mgr;
@@ -39,20 +40,18 @@ static int fme_region_probe(struct platform_device *pdev)
if (IS_ERR(mgr))
return -EPROBE_DEFER;
- region = devm_fpga_region_create(dev, mgr, fme_region_get_bridges);
- if (!region) {
- ret = -ENOMEM;
+ info.mgr = mgr;
+ info.compat_id = mgr->compat_id;
+ info.get_bridges = fme_region_get_bridges;
+ info.priv = pdata;
+ region = fpga_region_register_full(dev, &info);
+ if (IS_ERR(region)) {
+ ret = PTR_ERR(region);
goto eprobe_mgr_put;
}
- region->priv = pdata;
- region->compat_id = mgr->compat_id;
platform_set_drvdata(pdev, region);
- ret = fpga_region_register(region);
- if (ret)
- goto eprobe_mgr_put;
-
dev_dbg(dev, "DFL FME FPGA Region probed\n");
return 0;
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 511b20ff35a3..3905995ef6d5 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -1400,19 +1400,15 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info)
if (!cdev)
return ERR_PTR(-ENOMEM);
- cdev->region = devm_fpga_region_create(info->dev, NULL, NULL);
- if (!cdev->region) {
- ret = -ENOMEM;
- goto free_cdev_exit;
- }
-
cdev->parent = info->dev;
mutex_init(&cdev->lock);
INIT_LIST_HEAD(&cdev->port_dev_list);
- ret = fpga_region_register(cdev->region);
- if (ret)
+ cdev->region = fpga_region_register(info->dev, NULL, NULL);
+ if (IS_ERR(cdev->region)) {
+ ret = PTR_ERR(cdev->region);
goto free_cdev_exit;
+ }
/* create and init build info for enumeration */
binfo = devm_kzalloc(info->dev, sizeof(*binfo), GFP_KERNEL);
diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index a4838715221f..8af108a383e0 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -180,39 +180,42 @@ static struct attribute *fpga_region_attrs[] = {
ATTRIBUTE_GROUPS(fpga_region);
/**
- * fpga_region_create - alloc and init a struct fpga_region
+ * fpga_region_register_full - create and register an FPGA Region device
* @parent: device parent
- * @mgr: manager that programs this region
- * @get_bridges: optional function to get bridges to a list
- *
- * The caller of this function is responsible for freeing the resulting region
- * struct with fpga_region_free(). Using devm_fpga_region_create() instead is
- * recommended.
+ * @info: parameters for FPGA Region
*
- * Return: struct fpga_region or NULL
+ * Return: struct fpga_region or ERR_PTR()
*/
-struct fpga_region
-*fpga_region_create(struct device *parent,
- struct fpga_manager *mgr,
- int (*get_bridges)(struct fpga_region *))
+struct fpga_region *
+fpga_region_register_full(struct device *parent, const struct fpga_region_info *info)
{
struct fpga_region *region;
int id, ret = 0;
+ if (!info) {
+ dev_err(parent,
+ "Attempt to register without required info structure\n");
+ return ERR_PTR(-EINVAL);
+ }
+
region = kzalloc(sizeof(*region), GFP_KERNEL);
if (!region)
- return NULL;
+ return ERR_PTR(-ENOMEM);
id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL);
- if (id < 0)
+ if (id < 0) {
+ ret = id;
goto err_free;
+ }
+
+ region->mgr = info->mgr;
+ region->compat_id = info->compat_id;
+ region->priv = info->priv;
+ region->get_bridges = info->get_bridges;
- region->mgr = mgr;
- region->get_bridges = get_bridges;
mutex_init(®ion->mutex);
INIT_LIST_HEAD(®ion->bridge_list);
- device_initialize(®ion->dev);
region->dev.class = fpga_region_class;
region->dev.parent = parent;
region->dev.of_node = parent->of_node;
@@ -222,6 +225,12 @@ struct fpga_region
if (ret)
goto err_remove;
+ ret = device_register(®ion->dev);
+ if (ret) {
+ put_device(®ion->dev);
+ return ERR_PTR(ret);
+ }
+
return region;
err_remove:
@@ -229,76 +238,32 @@ struct fpga_region
err_free:
kfree(region);
- return NULL;
-}
-EXPORT_SYMBOL_GPL(fpga_region_create);
-
-/**
- * fpga_region_free - free an FPGA region created by fpga_region_create()
- * @region: FPGA region
- */
-void fpga_region_free(struct fpga_region *region)
-{
- ida_simple_remove(&fpga_region_ida, region->dev.id);
- kfree(region);
-}
-EXPORT_SYMBOL_GPL(fpga_region_free);
-
-static void devm_fpga_region_release(struct device *dev, void *res)
-{
- struct fpga_region *region = *(struct fpga_region **)res;
-
- fpga_region_free(region);
+ return ERR_PTR(ret);
}
+EXPORT_SYMBOL_GPL(fpga_region_register_full);
/**
- * devm_fpga_region_create - create and initialize a managed FPGA region struct
+ * fpga_region_register - create and register an FPGA Region device
* @parent: device parent
* @mgr: manager that programs this region
* @get_bridges: optional function to get bridges to a list
*
- * This function is intended for use in an FPGA region driver's probe function.
- * After the region driver creates the region struct with
- * devm_fpga_region_create(), it should register it with fpga_region_register().
- * The region driver's remove function should call fpga_region_unregister().
- * The region struct allocated with this function will be freed automatically on
- * driver detach. This includes the case of a probe function returning error
- * before calling fpga_region_register(), the struct will still get cleaned up.
+ * This simple version of the register should be sufficient for most users.
+ * The fpga_region_register_full() function is available for users that need to
+ * pass additional, optional parameters.
*
- * Return: struct fpga_region or NULL
+ * Return: struct fpga_region or ERR_PTR()
*/
-struct fpga_region
-*devm_fpga_region_create(struct device *parent,
- struct fpga_manager *mgr,
- int (*get_bridges)(struct fpga_region *))
+struct fpga_region *
+fpga_region_register(struct device *parent, struct fpga_manager *mgr,
+ int (*get_bridges)(struct fpga_region *))
{
- struct fpga_region **ptr, *region;
-
- ptr = devres_alloc(devm_fpga_region_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
- return NULL;
+ struct fpga_region_info info = { 0 };
- region = fpga_region_create(parent, mgr, get_bridges);
- if (!region) {
- devres_free(ptr);
- } else {
- *ptr = region;
- devres_add(parent, ptr);
- }
+ info.mgr = mgr;
+ info.get_bridges = get_bridges;
- return region;
-}
-EXPORT_SYMBOL_GPL(devm_fpga_region_create);
-
-/**
- * fpga_region_register - register an FPGA region
- * @region: FPGA region
- *
- * Return: 0 or -errno
- */
-int fpga_region_register(struct fpga_region *region)
-{
- return device_add(®ion->dev);
+ return fpga_region_register_full(parent, &info);
}
EXPORT_SYMBOL_GPL(fpga_region_register);
@@ -316,6 +281,10 @@ EXPORT_SYMBOL_GPL(fpga_region_unregister);
static void fpga_region_dev_release(struct device *dev)
{
+ struct fpga_region *region = to_fpga_region(dev);
+
+ ida_simple_remove(&fpga_region_ida, region->dev.id);
+ kfree(region);
}
/**
diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index e3c25576b6b9..9c662db1c508 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -405,16 +405,12 @@ static int of_fpga_region_probe(struct platform_device *pdev)
if (IS_ERR(mgr))
return -EPROBE_DEFER;
- region = devm_fpga_region_create(dev, mgr, of_fpga_region_get_bridges);
- if (!region) {
- ret = -ENOMEM;
+ region = fpga_region_register(dev, mgr, of_fpga_region_get_bridges);
+ if (IS_ERR(region)) {
+ ret = PTR_ERR(region);
goto eprobe_mgr_put;
}
- ret = fpga_region_register(region);
- if (ret)
- goto eprobe_mgr_put;
-
of_platform_populate(np, fpga_region_of_match, NULL, ®ion->dev);
platform_set_drvdata(pdev, region);
diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
index 27cb706275db..ae111beeffba 100644
--- a/include/linux/fpga/fpga-region.h
+++ b/include/linux/fpga/fpga-region.h
@@ -7,6 +7,27 @@
#include <linux/fpga/fpga-mgr.h>
#include <linux/fpga/fpga-bridge.h>
+struct fpga_region;
+
+/**
+ * struct fpga_region_info - collection of parameters an FPGA Region
+ * @mgr: fpga region manager
+ * @compat_id: FPGA region id for compatibility check.
+ * @priv: fpga region private data
+ * @get_bridges: optional function to get bridges to a list
+ *
+ * fpga_region_info contains parameters for the register function. These
+ * are separated into an info structure because they some are optional
+ * others could be added to in the future. The info structure facilitates
+ * maintaining a stable API.
+ */
+struct fpga_region_info {
+ struct fpga_manager *mgr;
+ struct fpga_compat_id *compat_id;
+ void *priv;
+ int (*get_bridges)(struct fpga_region *region);
+};
+
/**
* struct fpga_region - FPGA Region structure
* @dev: FPGA Region device
@@ -37,15 +58,12 @@ struct fpga_region *fpga_region_class_find(
int fpga_region_program_fpga(struct fpga_region *region);
-struct fpga_region
-*fpga_region_create(struct device *dev, struct fpga_manager *mgr,
- int (*get_bridges)(struct fpga_region *));
-void fpga_region_free(struct fpga_region *region);
-int fpga_region_register(struct fpga_region *region);
-void fpga_region_unregister(struct fpga_region *region);
+struct fpga_region *
+fpga_region_register_full(struct device *parent, const struct fpga_region_info *info);
-struct fpga_region
-*devm_fpga_region_create(struct device *dev, struct fpga_manager *mgr,
- int (*get_bridges)(struct fpga_region *));
+struct fpga_region *
+fpga_region_register(struct device *parent, struct fpga_manager *mgr,
+ int (*get_bridges)(struct fpga_region *));
+void fpga_region_unregister(struct fpga_region *region);
#endif /* _FPGA_REGION_H */
--
2.25.1
