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SubjectRe: [PATCH 1/2] libnvdimm/of_pmem: handle memory-region in DT
On Sun, Feb 23, 2020 at 5:30 AM Alistair Delva <adelva@google.com> wrote:
>
> From: Kenny Root <kroot@google.com>
>
> Add support for parsing the 'memory-region' DT property in addition to
> the 'reg' DT property. This enables use cases where the pmem region is
> not in I/O address space or dedicated memory (e.g. a bootloader
> carveout).
>
> Signed-off-by: Kenny Root <kroot@google.com>
> Signed-off-by: Alistair Delva <adelva@google.com>
> Cc: "Oliver O'Halloran" <oohall@gmail.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Vishal Verma <vishal.l.verma@intel.com>
> Cc: Dave Jiang <dave.jiang@intel.com>
> Cc: Ira Weiny <ira.weiny@intel.com>
> Cc: devicetree@vger.kernel.org
> Cc: linux-nvdimm@lists.01.org
> Cc: kernel-team@android.com
> ---
> drivers/nvdimm/of_pmem.c | 75 ++++++++++++++++++++++++++--------------
> 1 file changed, 50 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
> index 8224d1431ea9..a68e44fb0041 100644
> --- a/drivers/nvdimm/of_pmem.c
> +++ b/drivers/nvdimm/of_pmem.c
> @@ -14,13 +14,47 @@ struct of_pmem_private {
> struct nvdimm_bus *bus;
> };
>
> +static void of_pmem_register_region(struct platform_device *pdev,
> + struct nvdimm_bus *bus,
> + struct device_node *np,
> + struct resource *res, bool is_volatile)
> +{
> + struct nd_region_desc ndr_desc;
> + struct nd_region *region;
> +
> + /*
> + * NB: libnvdimm copies the data from ndr_desc into it's own
> + * structures so passing a stack pointer is fine.
> + */
> + memset(&ndr_desc, 0, sizeof(ndr_desc));
> + ndr_desc.numa_node = dev_to_node(&pdev->dev);
> + ndr_desc.target_node = ndr_desc.numa_node;
> + ndr_desc.res = res;
> + ndr_desc.of_node = np;
> + set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
> +
> + if (is_volatile)
> + region = nvdimm_volatile_region_create(bus, &ndr_desc);
> + else
> + region = nvdimm_pmem_region_create(bus, &ndr_desc);
> +
> + if (!region)
> + dev_warn(&pdev->dev,
> + "Unable to register region %pR from %pOF\n",
> + ndr_desc.res, np);
> + else
> + dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
> + ndr_desc.res, np);
> +}
> +
> static int of_pmem_region_probe(struct platform_device *pdev)
> {
> struct of_pmem_private *priv;
> - struct device_node *np;
> + struct device_node *mrp, *np;
> struct nvdimm_bus *bus;
> + struct resource res;
> bool is_volatile;
> - int i;
> + int i, ret;
>
> np = dev_of_node(&pdev->dev);
> if (!np)
> @@ -46,31 +80,22 @@ static int of_pmem_region_probe(struct platform_device *pdev)
> is_volatile ? "volatile" : "non-volatile", np);
>
> for (i = 0; i < pdev->num_resources; i++) {
> - struct nd_region_desc ndr_desc;
> - struct nd_region *region;
> -
> - /*
> - * NB: libnvdimm copies the data from ndr_desc into it's own
> - * structures so passing a stack pointer is fine.
> - */
> - memset(&ndr_desc, 0, sizeof(ndr_desc));
> - ndr_desc.numa_node = dev_to_node(&pdev->dev);
> - ndr_desc.target_node = ndr_desc.numa_node;
> - ndr_desc.res = &pdev->resource[i];
> - ndr_desc.of_node = np;
> - set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
> -
> - if (is_volatile)
> - region = nvdimm_volatile_region_create(bus, &ndr_desc);
> - else
> - region = nvdimm_pmem_region_create(bus, &ndr_desc);
> + of_pmem_register_region(pdev, bus, np, &pdev->resource[i],
> + is_volatile);
> + }
>
> - if (!region)
> - dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
> - ndr_desc.res, np);
> + i = 0;
> + while ((mr_np = of_parse_phandle(np, "memory-region", i++))) {

Doesn't compile since the the iteration variable is declared above as
"mrp" rather than "mr_np". The patch looks fine otherwise and seems to
work ok, so:

Reviewed-by: Oliver O'Halloran <oohall@gmail.com>

> + ret = of_address_to_resource(mr_np, 0, &res);
> + if (ret)
> + dev_warn(
> + &pdev->dev,
> + "Unable to acquire memory-region from %pOF: %d\n",
> + mr_np, ret);
> else
> - dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
> - ndr_desc.res, np);
> + of_pmem_register_region(pdev, bus, np, &res,
> + is_volatile)

Now days I think it's cleaner to use braces around multi-line blocks
even if it's a single statement, up to you though.

> + of_node_put(mr_np);
> }
>
> return 0;
> --
> 2.25.0.265.gbab2e86ba0-goog
>

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