[PATCH v4 3/6] libnvdimm, acpi, nfit: Add bus level dsm mask for pass thru.

[Jerry Hoemann]

Add a bus level dsm_mask to nvdimm_bus_descriptor to allow the passthru
calling mechanism to specify a different mask from the cmd_mask.

Populate bus_dsm_mask and use it to filter dsm calls that user can
make through the pass thru interface.

Signed-off-by: Jerry Hoemann <jerry.hoem...@hpe.com>
---
 drivers/acpi/nfit/core.c  | 8 ++++++++
 include/linux/libnvdimm.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index b46fca2..5e4c137 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -253,6 +253,8 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, 
struct nvdimm *nvdimm,
                cmd_name = nvdimm_bus_cmd_name(cmd);
                cmd_mask = nd_desc->cmd_mask;
                dsm_mask = cmd_mask;
+               if (cmd == ND_CMD_CALL)
+                       dsm_mask = nd_desc->bus_dsm_mask;
                desc = nd_cmd_bus_desc(cmd);
                uuid = to_nfit_uuid(NFIT_DEV_BUS);
                handle = adev->handle;
@@ -1613,6 +1615,7 @@ static void acpi_nfit_init_dsms(struct acpi_nfit_desc 
*acpi_desc)
        struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
        const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
        struct acpi_device *adev;
+       unsigned long dsm_mask;
        int i;
 
        nd_desc->cmd_mask = acpi_desc->bus_cmd_force_en;
@@ -1624,6 +1627,11 @@ static void acpi_nfit_init_dsms(struct acpi_nfit_desc 
*acpi_desc)
                if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
                        set_bit(i, &nd_desc->cmd_mask);
        set_bit(ND_CMD_CALL, &nd_desc->cmd_mask);
+
+       dsm_mask = 0x3bf;
+       for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
+               if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
+                       set_bit(i, &nd_desc->bus_dsm_mask);
 }
 
 static ssize_t range_index_show(struct device *dev,
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 6c80701..f8b8f43 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -54,6 +54,7 @@ typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
 
 struct nvdimm_bus_descriptor {
        const struct attribute_group **attr_groups;
+       unsigned long bus_dsm_mask;
        unsigned long cmd_mask;
        struct module *module;
        char *provider_name;
-- 
1.8.5.6