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nfit: disable vendor specific commands 

Module option to limit userspace to the publicly defined command set.
For cases where private DIMM commands may be interfering with the
kernel's handling of DIMM state this option can be set to block vendor
specific commands.

Cc: Jerry Hoemann <jerry.hoemann@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2016-04-28 18:01:20 -07:00
parent 31eca76ba2
commit 87554098fe
1 changed files with 13 additions and 4 deletions
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17
drivers/acpi/nfit.c
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@ -45,6 +45,11 @@ module_param(scrub_overflow_abort, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(scrub_overflow_abort,
"Number of times we overflow ARS results before abort");
static bool disable_vendor_specific;
module_param(disable_vendor_specific, bool, S_IRUGO);
MODULE_PARM_DESC(disable_vendor_specific,
"Limit commands to the publicly specified set\n");
static struct workqueue_struct *nfit_wq;
struct nfit_table_prev {
@ -989,13 +994,17 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
/* limit the supported commands to those that are publicly documented */
nfit_mem->family = i;
if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
if (nfit_mem->family == NVDIMM_FAMILY_INTEL) {
dsm_mask = 0x3fe;
else if (nfit_mem->family == NVDIMM_FAMILY_HPE1)
if (disable_vendor_specific)
dsm_mask &= ~(1 << ND_CMD_VENDOR);
} else if (nfit_mem->family == NVDIMM_FAMILY_HPE1)
dsm_mask = 0x1c3c76;
else if (nfit_mem->family == NVDIMM_FAMILY_HPE2)
else if (nfit_mem->family == NVDIMM_FAMILY_HPE2) {
dsm_mask = 0x1fe;
else {
if (disable_vendor_specific)
dsm_mask &= ~(1 << 8);
} else {
dev_err(dev, "unknown dimm command family\n");
nfit_mem->family = -1;
return force_enable_dimms ? 0 : -ENODEV;