cxl/pmem: Add "Freeze Security State" security command support

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 rev3.0 spec section 8.2.9.8.6.5 for reference.

Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/166983613019.2734609.10645754779802492122.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 890db291c6bf4bbeb5e9742884bc14b370989417..20bceb9e78bc0d4272d9a80d229480aecd7191d9 100644 (file)
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -68,6 +68,7 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = {
        CXL_CMD(GET_SECURITY_STATE, 0, 0x4, 0),
        CXL_CMD(SET_PASSPHRASE, 0x60, 0, 0),
        CXL_CMD(DISABLE_PASSPHRASE, 0x40, 0, 0),
+       CXL_CMD(FREEZE_SECURITY, 0, 0, 0),
 };
 
 /*

diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 9ad92f975b786387680aa71a08734104c12cc1e9..9007158969febc5566c20ae7394f0ac4ce0a691a 100644 (file)
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -276,6 +276,7 @@ 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 5a8e852ecadb73d9f536b608107a369648325d25..f323a1593cfc13494b6bd907da1fd1c9cbc6b2d9 100644 (file)
--- a/drivers/cxl/security.c
+++ b/drivers/cxl/security.c
@@ -87,10 +87,20 @@ 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;

diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h
index f6d383a80f22c091314f7059dee19a51f38e3b5b..7c0adcd68f4c8c116cba07d9aeb5fb12b1ff73e4 100644 (file)
--- a/include/uapi/linux/cxl_mem.h
+++ b/include/uapi/linux/cxl_mem.h
@@ -44,6 +44,7 @@
        ___C(GET_SECURITY_STATE, "Get Security State"),                   \
        ___C(SET_PASSPHRASE, "Set Passphrase"),                           \
        ___C(DISABLE_PASSPHRASE, "Disable Passphrase"),                   \
+       ___C(FREEZE_SECURITY, "Freeze Security"),                         \
        ___C(MAX, "invalid / last command")
 
 #define ___C(a, b) CXL_MEM_COMMAND_ID_##a