On 5/31/21 8:23 AM, Xu Yilun wrote:
> On Fri, May 28, 2021 at 02:57:55PM -0700, Russ Weight wrote:
>> The FPGA region class driver data structure is being treated as a
>> managed resource instead of using standard dev_release call-back
>> to release the class data structure. This change removes the
>> managed resource code and combines the create() and register()
>> functions into a single register() function.
>>
>> Signed-off-by: Russ Weight <russell.h.weight@xxxxxxxxx>
>> ---
>> v4:
>> - Added the compat_id parameter to fpga_bridge_register() to ensure
> A typo ... fpga_region_register() ...
Thanks - I'll fix it
>> 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
>> ---
>> drivers/fpga/dfl-fme-region.c | 12 ++--
>> drivers/fpga/dfl.c | 12 ++--
>> drivers/fpga/fpga-region.c | 106 +++++++------------------------
>> drivers/fpga/of-fpga-region.c | 10 +--
>> include/linux/fpga/fpga-region.h | 13 ++--
>> 5 files changed, 38 insertions(+), 115 deletions(-)
>>
>> diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c
>> index 1eeb42af1012..9e44c623a5e9 100644
>> --- a/drivers/fpga/dfl-fme-region.c
>> +++ b/drivers/fpga/dfl-fme-region.c
>> @@ -39,20 +39,16 @@ 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;
>> + region = fpga_region_register(dev, mgr, mgr->compat_id,
>> + fme_region_get_bridges);
>> + if (IS_ERR(region)) {
>> + ret = PTR_ERR(region);
>> goto eprobe_mgr_put;
>> }
>>
>> region->priv = pdata;
>> - region->compat_id = mgr->compat_id;
> I think the region->priv has the same issue as compat_id, could we
> introduce a fpga_region_ops for fpga_region_register, wrapping all
> input parameters, such as mgr, (*get_bridges)(), priv, compat_id?
OK - I'll look at making this change.
>
>> 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..6e628c07c1dc 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, 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 c3134b89c3fe..3d28880bf1cc 100644
>> --- a/drivers/fpga/fpga-region.c
>> +++ b/drivers/fpga/fpga-region.c
>> @@ -180,39 +180,38 @@ static struct attribute *fpga_region_attrs[] = {
>> ATTRIBUTE_GROUPS(fpga_region);
>>
>> /**
>> - * fpga_region_create - alloc and init a struct fpga_region
>> + * fpga_region_register - create and register a FPGA Region device
>> * @dev: device parent
>> * @mgr: manager that programs this region
>> + * @compat_id: FPGA manager id for compatibility check.
>> * @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.
>> - *
>> - * Return: struct fpga_region or NULL
>> + * Return struct fpga_region pointer on success, or ERR_PTR() on error.
> Please also restore the doc format.
will do
>
>> */
>> -struct fpga_region
>> -*fpga_region_create(struct device *dev,
>> - struct fpga_manager *mgr,
>> - int (*get_bridges)(struct fpga_region *))
>> +struct fpga_region *
>> +fpga_region_register(struct device *dev, struct fpga_manager *mgr,
>> + struct fpga_compat_id *compat_id,
>> + int (*get_bridges)(struct fpga_region *))
>> {
>> struct fpga_region *region;
>> int id, ret = 0;
>>
>> 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 = mgr;
>> + region->compat_id = compat_id;
>> 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 = dev;
>> region->dev.of_node = dev->of_node;
>> @@ -222,6 +221,12 @@ 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 +234,7 @@ struct fpga_region
>> err_free:
>> kfree(region);
>>
>> - return NULL;
>> -}
>> -EXPORT_SYMBOL_GPL(fpga_region_create);
>> -
>> -/**
>> - * fpga_region_free - free a 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);
>> -}
>> -
>> -/**
>> - * devm_fpga_region_create - create and initialize a managed FPGA region struct
>> - * @dev: 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 a 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.
>> - *
>> - * Return: struct fpga_region or NULL
>> - */
>> -struct fpga_region
>> -*devm_fpga_region_create(struct device *dev,
>> - 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;
>> -
>> - region = fpga_region_create(dev, mgr, get_bridges);
>> - if (!region) {
>> - devres_free(ptr);
>> - } else {
>> - *ptr = region;
>> - devres_add(dev, ptr);
>> - }
>> -
>> - return region;
>> -}
>> -EXPORT_SYMBOL_GPL(devm_fpga_region_create);
>> -
>> -/**
>> - * fpga_region_register - register a FPGA region
>> - * @region: FPGA region
>> - *
>> - * Return: 0 or -errno
>> - */
>> -int fpga_region_register(struct fpga_region *region)
>> -{
>> - return device_add(®ion->dev);
>> + return ERR_PTR(ret);
>> }
>> EXPORT_SYMBOL_GPL(fpga_region_register);
>>
>> @@ -316,6 +252,10 @@ 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 e405309baadc..c115e5fc0c62 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, NULL, 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..1e4c2dc7a63b 100644
>> --- a/include/linux/fpga/fpga-region.h
>> +++ b/include/linux/fpga/fpga-region.h
>> @@ -37,15 +37,10 @@ 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);
>> +struct fpga_region *
>> +fpga_region_register(struct device *dev, struct fpga_manager *mgr,
>> + struct fpga_compat_id *compat_id,
>> + int (*get_bridges)(struct fpga_region *));
> Same concern as fpga_mgr_register, shall we introduce a fpga_region_ops
> to wrap mgr, (*get_bridges), compat_id and priv? So we don't have to change
> all the callers everytime we need a new input for fpga_region.
Sure -I'll look at doing this for both the fpga-mgr and fpga-region code.
- Russ
>
> Thanks,
> Yilun
>
>> void fpga_region_unregister(struct fpga_region *region);
>>
>> -struct fpga_region
>> -*devm_fpga_region_create(struct device *dev, struct fpga_manager *mgr,
>> - int (*get_bridges)(struct fpga_region *));
>> -
>> #endif /* _FPGA_REGION_H */
>> --
>> 2.25.1
