| Message ID | 20241007-dcd-type2-upstream-v4-5-c261ee6eeded@intel.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Delegated to: | Ira Weiny |
| Headers | show |
| Series | DCD: Add support for Dynamic Capacity Devices (DCD) | expand |
On Mon, 07 Oct 2024 18:16:11 -0500 Ira Weiny <ira.weiny@intel.com> wrote: > The device DAX structure is being enhanced to track additional DCD > information. > > The current range tuple was not fully documented. Document it prior to > adding information for DC. > > Suggested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > Isn't this a nested struct? https://docs.kernel.org/doc-guide/kernel-doc.html#nested-structs-unions I'm not quite sure how we document when it's a nested pointer to a a structure. Is it the same as for a 'normal' nested struct? > --- > Changes: > [iweiny: move to start of series] > --- > drivers/dax/dax-private.h | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h > index 446617b73aea..ccde98c3d4e2 100644 > --- a/drivers/dax/dax-private.h > +++ b/drivers/dax/dax-private.h > @@ -58,7 +58,10 @@ struct dax_mapping { > * @dev - device core > * @pgmap - pgmap for memmap setup / lifetime (driver owned) > * @nr_range: size of @ranges > - * @ranges: resource-span + pgoff tuples for the instance > + * @ranges: range tuples of memory used > + * @pgoff: page offset @ranges.pgoff? etc > + * @range: resource-span > + * @mapping: device to assist in interrogating the range layout > */ > struct dev_dax { > struct dax_region *region; >
Jonathan Cameron wrote: > On Mon, 07 Oct 2024 18:16:11 -0500 > Ira Weiny <ira.weiny@intel.com> wrote: > > > The device DAX structure is being enhanced to track additional DCD > > information. > > > > The current range tuple was not fully documented. Document it prior to > > adding information for DC. > > > > Suggested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > > > Isn't this a nested struct? > https://docs.kernel.org/doc-guide/kernel-doc.html#nested-structs-unions > > I'm not quite sure how we document when it's a nested pointer to a > a structure. Is it the same as for a 'normal' nested struct? In this case I think it best to document the struct and just document the reference. See below. > > > --- > > Changes: > > [iweiny: move to start of series] > > --- > > drivers/dax/dax-private.h | 5 ++++- > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h > > index 446617b73aea..ccde98c3d4e2 100644 > > --- a/drivers/dax/dax-private.h > > +++ b/drivers/dax/dax-private.h > > @@ -58,7 +58,10 @@ struct dax_mapping { > > * @dev - device core > > * @pgmap - pgmap for memmap setup / lifetime (driver owned) > > * @nr_range: size of @ranges > > - * @ranges: resource-span + pgoff tuples for the instance > > + * @ranges: range tuples of memory used > > + * @pgoff: page offset > @ranges.pgoff? > etc Ok yea. As for the pointer to a structure. I think the best thing to do is simply document that structure. Something like this building on this patch: diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h index ccde98c3d4e2..b9816c933575 100644 --- a/drivers/dax/dax-private.h +++ b/drivers/dax/dax-private.h @@ -40,6 +40,12 @@ struct dax_region { struct device *youngest; }; +/** + * struct dax_mapping - device to display mapping range attributes + * @dev: device representing this range + * @range_id: index within dev_dax ranges array + * @id: ida of this mapping + */ struct dax_mapping { struct device dev; int range_id; @@ -59,9 +65,9 @@ struct dax_mapping { * @pgmap - pgmap for memmap setup / lifetime (driver owned) * @nr_range: size of @ranges * @ranges: range tuples of memory used - * @pgoff: page offset - * @range: resource-span - * @mapping: device to assist in interrogating the range layout + * @ranges.pgoff: page offset + * @ranges.range: resource-span + * @ranges.mapping: reference to the dax_mapping for this range */ struct dev_dax { struct dax_region *region;
On Fri, 11 Oct 2024 15:40:58 -0500 Ira Weiny <ira.weiny@intel.com> wrote: > Jonathan Cameron wrote: > > On Mon, 07 Oct 2024 18:16:11 -0500 > > Ira Weiny <ira.weiny@intel.com> wrote: > > > > > The device DAX structure is being enhanced to track additional DCD > > > information. > > > > > > The current range tuple was not fully documented. Document it prior to > > > adding information for DC. > > > > > > Suggested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > > > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > > > > > Isn't this a nested struct? > > https://docs.kernel.org/doc-guide/kernel-doc.html#nested-structs-unions > > > > I'm not quite sure how we document when it's a nested pointer to a > > a structure. Is it the same as for a 'normal' nested struct? > > In this case I think it best to document the struct and just document the > reference. See below. > > > > > > --- > > > Changes: > > > [iweiny: move to start of series] > > > --- > > > drivers/dax/dax-private.h | 5 ++++- > > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > > > diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h > > > index 446617b73aea..ccde98c3d4e2 100644 > > > --- a/drivers/dax/dax-private.h > > > +++ b/drivers/dax/dax-private.h > > > @@ -58,7 +58,10 @@ struct dax_mapping { > > > * @dev - device core > > > * @pgmap - pgmap for memmap setup / lifetime (driver owned) > > > * @nr_range: size of @ranges > > > - * @ranges: resource-span + pgoff tuples for the instance > > > + * @ranges: range tuples of memory used > > > + * @pgoff: page offset > > @ranges.pgoff? > > etc > > Ok yea. > > As for the pointer to a structure. I think the best thing to do is simply > document that structure. > > Something like this building on this patch: > > > diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h > index ccde98c3d4e2..b9816c933575 100644 > --- a/drivers/dax/dax-private.h > +++ b/drivers/dax/dax-private.h > @@ -40,6 +40,12 @@ struct dax_region { > struct device *youngest; > }; > > +/** > + * struct dax_mapping - device to display mapping range attributes > + * @dev: device representing this range > + * @range_id: index within dev_dax ranges array > + * @id: ida of this mapping > + */ > struct dax_mapping { > struct device dev; > int range_id; > @@ -59,9 +65,9 @@ struct dax_mapping { > * @pgmap - pgmap for memmap setup / lifetime (driver owned) > * @nr_range: size of @ranges > * @ranges: range tuples of memory used > - * @pgoff: page offset > - * @range: resource-span > - * @mapping: device to assist in interrogating the range layout > + * @ranges.pgoff: page offset > + * @ranges.range: resource-span > + * @ranges.mapping: reference to the dax_mapping for this range Maybe just pull out definition of struct dev_dax_range? Avoids this confusion and no particularly obvious reason why it is embedded in the definition of dev_dax. > */ > struct dev_dax { > struct dax_region *region; >
diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h index 446617b73aea..ccde98c3d4e2 100644 --- a/drivers/dax/dax-private.h +++ b/drivers/dax/dax-private.h @@ -58,7 +58,10 @@ struct dax_mapping { * @dev - device core * @pgmap - pgmap for memmap setup / lifetime (driver owned) * @nr_range: size of @ranges - * @ranges: resource-span + pgoff tuples for the instance + * @ranges: range tuples of memory used + * @pgoff: page offset + * @range: resource-span + * @mapping: device to assist in interrogating the range layout */ struct dev_dax { struct dax_region *region;
The device DAX structure is being enhanced to track additional DCD information. The current range tuple was not fully documented. Document it prior to adding information for DC. Suggested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> --- Changes: [iweiny: move to start of series] --- drivers/dax/dax-private.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)