IFS generation number is reported via MSR_INTEGRITY_CAPS. As IFS
support gets added to newer CPUs, some differences are expected during
IFS image loading and test flows.
Define MSR bitmasks to extract and store the generation in driver data,
so that driver can modify its MSR interaction appropriately.
Signed-off-by: Jithu Joseph <jithu.joseph@xxxxxxxxx>
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Tested-by: Pengfei Xu <pengfei.xu@xxxxxxxxx>
---
arch/x86/include/asm/msr-index.h | 1 +
drivers/platform/x86/intel/ifs/ifs.h | 2 ++
drivers/platform/x86/intel/ifs/core.c | 3 +++
3 files changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 1d111350197f..838e5a013a07 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -222,6 +222,7 @@
#define MSR_INTEGRITY_CAPS_ARRAY_BIST BIT(MSR_INTEGRITY_CAPS_ARRAY_BIST_BIT)
#define MSR_INTEGRITY_CAPS_PERIODIC_BIST_BIT 4
#define MSR_INTEGRITY_CAPS_PERIODIC_BIST BIT(MSR_INTEGRITY_CAPS_PERIODIC_BIST_BIT)
+#define MSR_INTEGRITY_CAPS_SAF_GEN_MASK GENMASK_ULL(10, 9)
#define MSR_LBR_NHM_FROM 0x00000680
#define MSR_LBR_NHM_TO 0x000006c0
diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
index 93191855890f..d666aeed20fc 100644
--- a/drivers/platform/x86/intel/ifs/ifs.h
+++ b/drivers/platform/x86/intel/ifs/ifs.h
@@ -229,6 +229,7 @@ struct ifs_test_caps {
* @status: it holds simple status pass/fail/untested
* @scan_details: opaque scan status code from h/w
* @cur_batch: number indicating the currently loaded test file
+ * @generation: IFS test generation enumerated by hardware
*/
struct ifs_data {
int loaded_version;
@@ -238,6 +239,7 @@ struct ifs_data {
int status;
u64 scan_details;
u32 cur_batch;
+ u32 generation;
};
struct ifs_work {
diff --git a/drivers/platform/x86/intel/ifs/core.c b/drivers/platform/x86/intel/ifs/core.c
index 306f886b52d2..4ff2aa4b484b 100644
--- a/drivers/platform/x86/intel/ifs/core.c
+++ b/drivers/platform/x86/intel/ifs/core.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2022 Intel Corporation. */
+#include <linux/bitfield.h>
#include <linux/module.h>
#include <linux/kdev_t.h>
#include <linux/semaphore.h>
@@ -94,6 +95,8 @@ static int __init ifs_init(void)
for (i = 0; i < IFS_NUMTESTS; i++) {
if (!(msrval & BIT(ifs_devices[i].test_caps->integrity_cap_bit)))
continue;
+ ifs_devices[i].rw_data.generation = FIELD_GET(MSR_INTEGRITY_CAPS_SAF_GEN_MASK,
+ msrval);
ret = misc_register(&ifs_devices[i].misc);
if (ret)
goto err_exit;
--
2.25.1
