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Date: Tue, 12 Nov 2019 17:18:30 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To: Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org
Cc: Ira Weiny <ira.weiny@...el.com>,
Michael Ellerman <mpe@...erman.id.au>,
"Oliver O'Halloran" <oohall@...il.com>,
Vishal Verma <vishal.l.verma@...el.com>, peterz@...radead.org,
dave.hansen@...ux.intel.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: Re: [PATCH 08/16] libnvdimm: Move nvdimm_bus_attribute_group to device_type
Dan Williams <dan.j.williams@...el.com> writes:
> A 'struct device_type' instance can carry default attributes for the
> device. Use this facility to remove the export of
> nvdimm_bus_attribute_group and put the responsibility on the core rather
> than leaf implementations to define this attribute.
>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: "Oliver O'Halloran" <oohall@...il.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
> arch/powerpc/platforms/pseries/papr_scm.c | 6 ------
> drivers/acpi/nfit/core.c | 1 -
> drivers/nvdimm/bus.c | 9 +++++++--
> drivers/nvdimm/core.c | 8 ++++++--
> drivers/nvdimm/e820.c | 6 ------
> drivers/nvdimm/nd.h | 1 +
> drivers/nvdimm/of_pmem.c | 6 ------
> include/linux/libnvdimm.h | 2 --
> 8 files changed, 14 insertions(+), 25 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
> index 8354737ac340..33aa59e666e5 100644
> --- a/arch/powerpc/platforms/pseries/papr_scm.c
> +++ b/arch/powerpc/platforms/pseries/papr_scm.c
> @@ -284,11 +284,6 @@ int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
> return 0;
> }
>
> -static const struct attribute_group *bus_attr_groups[] = {
> - &nvdimm_bus_attribute_group,
> - NULL,
> -};
> -
> static inline int papr_scm_node(int node)
> {
> int min_dist = INT_MAX, dist;
> @@ -319,7 +314,6 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
> p->bus_desc.ndctl = papr_scm_ndctl;
> p->bus_desc.module = THIS_MODULE;
> p->bus_desc.of_node = p->pdev->dev.of_node;
> - p->bus_desc.attr_groups = bus_attr_groups;
> p->bus_desc.provider_name = kstrdup(p->pdev->name, GFP_KERNEL);
>
> if (!p->bus_desc.provider_name)
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 84fc1f865802..a3320f93616d 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -1404,7 +1404,6 @@ static const struct attribute_group acpi_nfit_attribute_group = {
> };
>
> static const struct attribute_group *acpi_nfit_attribute_groups[] = {
> - &nvdimm_bus_attribute_group,
> &acpi_nfit_attribute_group,
> NULL,
> };
> diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
> index 28e1b265aa63..1d330d46d036 100644
> --- a/drivers/nvdimm/bus.c
> +++ b/drivers/nvdimm/bus.c
> @@ -300,9 +300,14 @@ static void nvdimm_bus_release(struct device *dev)
> kfree(nvdimm_bus);
> }
>
> +static const struct device_type nvdimm_bus_dev_type = {
> + .release = nvdimm_bus_release,
> + .groups = nvdimm_bus_attribute_groups,
> +};
> +
> bool is_nvdimm_bus(struct device *dev)
> {
> - return dev->release == nvdimm_bus_release;
> + return dev->type == &nvdimm_bus_dev_type;
> }
>
> struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
> @@ -355,7 +360,7 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
> badrange_init(&nvdimm_bus->badrange);
> nvdimm_bus->nd_desc = nd_desc;
> nvdimm_bus->dev.parent = parent;
> - nvdimm_bus->dev.release = nvdimm_bus_release;
> + nvdimm_bus->dev.type = &nvdimm_bus_dev_type;
> nvdimm_bus->dev.groups = nd_desc->attr_groups;
> nvdimm_bus->dev.bus = &nvdimm_bus_type;
> nvdimm_bus->dev.of_node = nd_desc->of_node;
> diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
> index 9204f1e9fd14..81231ca23db0 100644
> --- a/drivers/nvdimm/core.c
> +++ b/drivers/nvdimm/core.c
> @@ -385,10 +385,14 @@ static struct attribute *nvdimm_bus_attributes[] = {
> NULL,
> };
>
> -struct attribute_group nvdimm_bus_attribute_group = {
> +static const struct attribute_group nvdimm_bus_attribute_group = {
> .attrs = nvdimm_bus_attributes,
> };
> -EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
> +
> +const struct attribute_group *nvdimm_bus_attribute_groups[] = {
> + &nvdimm_bus_attribute_group,
> + NULL,
> +};
>
> int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
> {
> diff --git a/drivers/nvdimm/e820.c b/drivers/nvdimm/e820.c
> index 9a971a59dec7..e02f60ad6c99 100644
> --- a/drivers/nvdimm/e820.c
> +++ b/drivers/nvdimm/e820.c
> @@ -8,11 +8,6 @@
> #include <linux/libnvdimm.h>
> #include <linux/module.h>
>
> -static const struct attribute_group *e820_pmem_attribute_groups[] = {
> - &nvdimm_bus_attribute_group,
> - NULL,
> -};
> -
> static int e820_pmem_remove(struct platform_device *pdev)
> {
> struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
> @@ -55,7 +50,6 @@ static int e820_pmem_probe(struct platform_device *pdev)
> struct nvdimm_bus *nvdimm_bus;
> int rc = -ENXIO;
>
> - nd_desc.attr_groups = e820_pmem_attribute_groups;
> nd_desc.provider_name = "e820";
> nd_desc.module = THIS_MODULE;
> nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
> diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
> index e7f3a2fee2ab..577800242110 100644
> --- a/drivers/nvdimm/nd.h
> +++ b/drivers/nvdimm/nd.h
> @@ -300,6 +300,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
> extern const struct attribute_group *nd_pfn_attribute_groups[];
> extern const struct attribute_group nd_device_attribute_group;
> extern const struct attribute_group nd_numa_attribute_group;
> +extern const struct attribute_group *nvdimm_bus_attribute_groups[];
> #else
> static inline int nd_pfn_probe(struct device *dev,
> struct nd_namespace_common *ndns)
> diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
> index c0b5ac36df9d..8224d1431ea9 100644
> --- a/drivers/nvdimm/of_pmem.c
> +++ b/drivers/nvdimm/of_pmem.c
> @@ -9,11 +9,6 @@
> #include <linux/ioport.h>
> #include <linux/slab.h>
>
> -static const struct attribute_group *bus_attr_groups[] = {
> - &nvdimm_bus_attribute_group,
> - NULL,
> -};
> -
> struct of_pmem_private {
> struct nvdimm_bus_descriptor bus_desc;
> struct nvdimm_bus *bus;
> @@ -35,7 +30,6 @@ static int of_pmem_region_probe(struct platform_device *pdev)
> if (!priv)
> return -ENOMEM;
>
> - priv->bus_desc.attr_groups = bus_attr_groups;
> priv->bus_desc.provider_name = kstrdup(pdev->name, GFP_KERNEL);
> priv->bus_desc.module = THIS_MODULE;
> priv->bus_desc.of_node = np;
> diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
> index 3644af97bcb4..9df091bd30ba 100644
> --- a/include/linux/libnvdimm.h
> +++ b/include/linux/libnvdimm.h
> @@ -65,8 +65,6 @@ enum {
> DPA_RESOURCE_ADJUSTED = 1 << 0,
> };
>
> -extern struct attribute_group nvdimm_bus_attribute_group;
> -
> struct nvdimm;
> struct nvdimm_bus_descriptor;
> typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
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