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acpi, nfit: Prefer _DSM over _LSR for namespace label reads

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The _LSR method indicates locked status via error-code-3 returned in the
_LSR payload. When any error is returned the payload of _LSR is
truncated to a zero-length buffer.

The _DSM path in comparison allows system software to retrieve the
locked status *and* namespace label area contents.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2018-06-13 09:06:52 -07:00
parent 08e6b3c6e3
commit 099b07a25f
1 changed files with 11 additions and 1 deletions
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12
drivers/acpi/nfit/core.c
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@ -1697,7 +1697,7 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
{
struct acpi_device *adev, *adev_dimm;
struct device *dev = acpi_desc->dev;
unsigned long dsm_mask;
unsigned long dsm_mask, label_mask;
const guid_t *guid;
int i;
int family = -1;
@ -1769,6 +1769,16 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
1ULL << i))
set_bit(i, &nfit_mem->dsm_mask);
/*
* Prefer the NVDIMM_FAMILY_INTEL label read commands if present
* due to their better semantics handling locked capacity.
*/
label_mask = 1 << ND_CMD_GET_CONFIG_SIZE | 1 << ND_CMD_GET_CONFIG_DATA
| 1 << ND_CMD_SET_CONFIG_DATA;
if (family == NVDIMM_FAMILY_INTEL
&& (dsm_mask & label_mask) == label_mask)
return 0;
if (acpi_nvdimm_has_method(adev_dimm, "_LSI")
&& acpi_nvdimm_has_method(adev_dimm, "_LSR")) {
dev_dbg(dev, "%s: has _LSR\n", dev_name(&adev_dimm->dev));