[PATCH RFC 08/15] cxl/pmem: Add "Freeze Security State" security command support

[Dave Jiang]

Create callback function to support the nvdimm_security_ops() ->freeze()
callback. Translate the operation to send "Freeze Security State" security
command for CXL memory device.

See CXL 2.0 spec section 8.2.9.5.6.5 for reference.

Signed-off-by: Dave Jiang <dave.ji...@intel.com>
---
 drivers/cxl/cxlmem.h   |    1 +
 drivers/cxl/security.c |   10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 70a1eb7720d3..ced85be291f3 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -253,6 +253,7 @@ enum cxl_opcode {
        CXL_MBOX_OP_GET_SECURITY_STATE  = 0x4500,
        CXL_MBOX_OP_SET_PASSPHRASE      = 0x4501,
        CXL_MBOX_OP_DISABLE_PASSPHRASE  = 0x4502,
+       CXL_MBOX_OP_FREEZE_SECURITY     = 0x4504,
        CXL_MBOX_OP_MAX                 = 0x10000
 };
 
diff --git a/drivers/cxl/security.c b/drivers/cxl/security.c
index 4aec8e41e167..6399266a5908 100644
--- a/drivers/cxl/security.c
+++ b/drivers/cxl/security.c
@@ -105,10 +105,20 @@ static int cxl_pmem_security_disable(struct nvdimm 
*nvdimm,
        return rc;
 }
 
+static int cxl_pmem_security_freeze(struct nvdimm *nvdimm)
+{
+       struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
+       struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
+       struct cxl_dev_state *cxlds = cxlmd->cxlds;
+
+       return cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_FREEZE_SECURITY, NULL, 0, 
NULL, 0);
+}
+
 static const struct nvdimm_security_ops __cxl_security_ops = {
        .get_flags = cxl_pmem_get_security_flags,
        .change_key = cxl_pmem_security_change_key,
        .disable = cxl_pmem_security_disable,
+       .freeze = cxl_pmem_security_freeze,
 };
 
 const struct nvdimm_security_ops *cxl_security_ops = &__cxl_security_ops;