cxl/pmem: Introduce nvdimm_security_ops with ->get_flags() operation

Add nvdimm_security_ops support for CXL memory device with the introduction
of the ->get_flags() callback function. This is part of the "Persistent
Memory Data-at-rest Security" command set for CXL memory device support.
The ->get_flags() function provides the security state of the persistent
memory device defined by the CXL 3.0 spec section 8.2.9.8.6.1.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/166983609611.2734609.13231854299523325319.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/cxl/Makefile b/drivers/cxl/Makefile
index a782707..db321f4 100644 (file)
--- a/drivers/cxl/Makefile
+++ b/drivers/cxl/Makefile
@@ -9,5 +9,5 @@ obj-$(CONFIG_CXL_PORT) += cxl_port.o
 cxl_mem-y := mem.o
 cxl_pci-y := pci.o
 cxl_acpi-y := acpi.o
-cxl_pmem-y := pmem.o
+cxl_pmem-y := pmem.o security.o
 cxl_port-y := port.o

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 0c90f13..6907ee1 100644 (file)
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -65,6 +65,7 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = {
        CXL_CMD(GET_SCAN_MEDIA_CAPS, 0x10, 0x4, 0),
        CXL_CMD(SCAN_MEDIA, 0x11, 0, 0),
        CXL_CMD(GET_SCAN_MEDIA, 0, CXL_VARIABLE_PAYLOAD, 0),
+       CXL_CMD(GET_SECURITY_STATE, 0, 0x4, 0),
 };
 
 /*

diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 88e3a8e..25d1d8f 100644 (file)
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -273,6 +273,7 @@ enum cxl_opcode {
        CXL_MBOX_OP_GET_SCAN_MEDIA_CAPS = 0x4303,
        CXL_MBOX_OP_SCAN_MEDIA          = 0x4304,
        CXL_MBOX_OP_GET_SCAN_MEDIA      = 0x4305,
+       CXL_MBOX_OP_GET_SECURITY_STATE  = 0x4500,
        CXL_MBOX_OP_MAX                 = 0x10000
 };
 
@@ -372,6 +373,13 @@ struct cxl_mem_command {
 #define CXL_CMD_FLAG_FORCE_ENABLE BIT(0)
 };
 
+#define CXL_PMEM_SEC_STATE_USER_PASS_SET       0x01
+#define CXL_PMEM_SEC_STATE_MASTER_PASS_SET     0x02
+#define CXL_PMEM_SEC_STATE_LOCKED              0x04
+#define CXL_PMEM_SEC_STATE_FROZEN              0x08
+#define CXL_PMEM_SEC_STATE_USER_PLIMIT         0x10
+#define CXL_PMEM_SEC_STATE_MASTER_PLIMIT       0x20
+
 int cxl_mbox_send_cmd(struct cxl_dev_state *cxlds, u16 opcode, void *in,
                      size_t in_size, void *out, size_t out_size);
 int cxl_dev_state_identify(struct cxl_dev_state *cxlds);

diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index 4c627d6..efffc73 100644 (file)
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -11,6 +11,8 @@
 #include "cxlmem.h"
 #include "cxl.h"
 
+extern const struct nvdimm_security_ops *cxl_security_ops;
+
 /*
  * Ordered workqueue for cxl nvdimm device arrival and departure
  * to coordinate bus rescans when a bridge arrives and trigger remove
@@ -78,8 +80,8 @@ static int cxl_nvdimm_probe(struct device *dev)
        set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask);
        set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask);
        set_bit(ND_CMD_SET_CONFIG_DATA, &cmd_mask);
-       nvdimm = nvdimm_create(cxl_nvb->nvdimm_bus, cxl_nvd, NULL, flags,
-                              cmd_mask, 0, NULL);
+       nvdimm = __nvdimm_create(cxl_nvb->nvdimm_bus, cxl_nvd, NULL, flags,
+                                cmd_mask, 0, NULL, NULL, cxl_security_ops, NULL);
        if (!nvdimm) {
                rc = -ENOMEM;
                goto out;

diff --git a/drivers/cxl/security.c b/drivers/cxl/security.c
new file mode 100644 (file)
index 0000000..8061730
--- /dev/null
+++ b/drivers/cxl/security.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2022 Intel Corporation. All rights reserved. */
+#include <linux/libnvdimm.h>
+#include <asm/unaligned.h>
+#include <linux/module.h>
+#include <linux/async.h>
+#include <linux/slab.h>
+#include "cxlmem.h"
+#include "cxl.h"
+
+static unsigned long cxl_pmem_get_security_flags(struct nvdimm *nvdimm,
+                                                enum nvdimm_passphrase_type ptype)
+{
+       struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
+       struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
+       struct cxl_dev_state *cxlds = cxlmd->cxlds;
+       unsigned long security_flags = 0;
+       u32 sec_out;
+       int rc;
+
+       rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_SECURITY_STATE, NULL, 0,
+                              &sec_out, sizeof(sec_out));
+       if (rc < 0)
+               return 0;
+
+       if (ptype == NVDIMM_MASTER) {
+               if (sec_out & CXL_PMEM_SEC_STATE_MASTER_PASS_SET)
+                       set_bit(NVDIMM_SECURITY_UNLOCKED, &security_flags);
+               else
+                       set_bit(NVDIMM_SECURITY_DISABLED, &security_flags);
+               if (sec_out & CXL_PMEM_SEC_STATE_MASTER_PLIMIT)
+                       set_bit(NVDIMM_SECURITY_FROZEN, &security_flags);
+               return security_flags;
+       }
+
+       if (sec_out & CXL_PMEM_SEC_STATE_USER_PASS_SET) {
+               if (sec_out & CXL_PMEM_SEC_STATE_FROZEN ||
+                   sec_out & CXL_PMEM_SEC_STATE_USER_PLIMIT)
+                       set_bit(NVDIMM_SECURITY_FROZEN, &security_flags);
+
+               if (sec_out & CXL_PMEM_SEC_STATE_LOCKED)
+                       set_bit(NVDIMM_SECURITY_LOCKED, &security_flags);
+               else
+                       set_bit(NVDIMM_SECURITY_UNLOCKED, &security_flags);
+       } else {
+               set_bit(NVDIMM_SECURITY_DISABLED, &security_flags);
+       }
+
+       return security_flags;
+}
+
+static const struct nvdimm_security_ops __cxl_security_ops = {
+       .get_flags = cxl_pmem_get_security_flags,
+};
+
+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 c71021a..cdc6049 100644 (file)
--- a/include/uapi/linux/cxl_mem.h
+++ b/include/uapi/linux/cxl_mem.h
@@ -41,6 +41,7 @@
        ___C(GET_SCAN_MEDIA_CAPS, "Get Scan Media Capabilities"),         \
        ___C(SCAN_MEDIA, "Scan Media"),                                   \
        ___C(GET_SCAN_MEDIA, "Get Scan Media Results"),                   \
+       ___C(GET_SECURITY_STATE, "Get Security State"),                   \
        ___C(MAX, "invalid / last command")
 
 #define ___C(a, b) CXL_MEM_COMMAND_ID_##a

diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild
index 500be85..e4048a0 100644 (file)
--- a/tools/testing/cxl/Kbuild
+++ b/tools/testing/cxl/Kbuild
@@ -26,6 +26,7 @@ cxl_acpi-y += config_check.o
 obj-m += cxl_pmem.o
 
 cxl_pmem-y := $(CXL_SRC)/pmem.o
+cxl_pmem-y += $(CXL_SRC)/security.o
 cxl_pmem-y += config_check.o
 
 obj-m += cxl_port.o