Re: [PATCH 2/2] powerpc/pseries: Add driver for PAPR SCM regions

Dan Williams [off-list ref] writes:

On Tue, Oct 9, 2018 at 11:21 PM Oliver O'Halloran [off-list ref] wrote:

quoted

Adds a driver that implements support for enabling and accessing PAPR
SCM regions. Unfortunately due to how the PAPR interface works we can't
use the existing of_pmem driver (yet) because:

...

quoted

+
+static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
+{
+       struct device *dev = &p->pdev->dev;
+       struct nd_mapping_desc mapping;
+       struct nd_region_desc ndr_desc;
+       unsigned long dimm_flags;
+
+       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)
+               return -ENOMEM;
+
+       p->bus = nvdimm_bus_register(NULL, &p->bus_desc);
+       if (!p->bus) {
+               dev_err(dev, "Error creating nvdimm bus %pOF\n", p->dn);
+               return -ENXIO;
+       }
+
+       dimm_flags = 0;
+       set_bit(NDD_ALIASING, &dimm_flags);
+
+       p->nvdimm = nvdimm_create(p->bus, p, papr_scm_dimm_groups,
+                               dimm_flags, PAPR_SCM_DIMM_CMD_MASK, 0, NULL);

Looks good, although I'm just about to push out commits that change
this function signature to take a 'security_ops' pointer. If you need
a stable branch to base this on, let me know.

...

Other than that looks ok to me:

Acked-by: Dan Williams <redacted>

...just the matter of what to do about function signature change.

Yeah that's a bit of a bother.

The ideal for me would be that you put the commit that changes the
signature by itself in a branch based on 4.19-rc3 (or earlier), and then
we could both just merge that.

But not sure if that will work with whatever else you're trying to sync
up with.

cheers