Cloud Service Providers that operate fleets of servers have reported [1] occasions where they can detect that a CPU has gone bad due to effects like electromigration, or isolated manufacturing defects. However, that detection method is A/B testing seemingly random application failures looking for a pattern. In-Field Scan (IFS) is a driver for a platform capability to load a crafted 'scan image' to run targeted low level diagnostics outside of the CPU's architectural error detection capabilities. [1]: https://www.youtube.com/watch?v=QMF3rqhjYuM IFS will be available in some server SKUs starting with Sapphire Rapids. Add basic parts of the IFS module (initialization and check IFS capability support in a processor). MSR IA32_CORE_CAPABILITY is a feature-enumerating MSR, bit 2 of which reports MSR_INTEGRITY_CAPABILITIES. Processor that supports IFS should reports the MSR_INTEGRITY_CAPABILITIES enabled. Please check the latest Intel 64 and IA-32 Architectures Software Developer's Manual for more detailed information on the MSR and the MSR_INTEGRITY_CAPABILITIES. Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx> Signed-off-by: Jithu Joseph <jithu.joseph@xxxxxxxxx> --- MAINTAINERS | 7 ++++ drivers/platform/x86/intel/Kconfig | 1 + drivers/platform/x86/intel/Makefile | 1 + drivers/platform/x86/intel/ifs/Kconfig | 9 +++++ drivers/platform/x86/intel/ifs/Makefile | 3 ++ drivers/platform/x86/intel/ifs/core.c | 44 +++++++++++++++++++++++++ drivers/platform/x86/intel/ifs/ifs.h | 11 +++++++ 7 files changed, 76 insertions(+) create mode 100644 drivers/platform/x86/intel/ifs/Kconfig create mode 100644 drivers/platform/x86/intel/ifs/Makefile create mode 100644 drivers/platform/x86/intel/ifs/core.c create mode 100644 drivers/platform/x86/intel/ifs/ifs.h diff --git a/MAINTAINERS b/MAINTAINERS index 777cd6fa2b3d..4c9912c0d725 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9685,6 +9685,13 @@ B: https://bugzilla.kernel.org T: git git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux.git F: drivers/idle/intel_idle.c +INTEL IN FIELD SCAN (IFS) DRIVER +M: Jithu Joseph <jithu.joseph@xxxxxxxxx> +R: Ashok Raj <ashok.raj@xxxxxxxxx> +R: Tony Luck <tony.luck@xxxxxxxxx> +S: Maintained +F: drivers/platform/x86/intel/ifs + INTEL INTEGRATED SENSOR HUB DRIVER M: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx> M: Jiri Kosina <jikos@xxxxxxxxxx> diff --git a/drivers/platform/x86/intel/Kconfig b/drivers/platform/x86/intel/Kconfig index 8e65086bb6c8..7339e7daf0a1 100644 --- a/drivers/platform/x86/intel/Kconfig +++ b/drivers/platform/x86/intel/Kconfig @@ -4,6 +4,7 @@ # source "drivers/platform/x86/intel/atomisp2/Kconfig" +source "drivers/platform/x86/intel/ifs/Kconfig" source "drivers/platform/x86/intel/int1092/Kconfig" source "drivers/platform/x86/intel/int33fe/Kconfig" source "drivers/platform/x86/intel/int3472/Kconfig" diff --git a/drivers/platform/x86/intel/Makefile b/drivers/platform/x86/intel/Makefile index 35f2066578b2..bd7f2ef5e767 100644 --- a/drivers/platform/x86/intel/Makefile +++ b/drivers/platform/x86/intel/Makefile @@ -5,6 +5,7 @@ # obj-$(CONFIG_INTEL_ATOMISP2_PDX86) += atomisp2/ +obj-$(CONFIG_INTEL_IFS) += ifs/ obj-$(CONFIG_INTEL_SAR_INT1092) += int1092/ obj-$(CONFIG_INTEL_CHT_INT33FE) += int33fe/ obj-$(CONFIG_INTEL_SKL_INT3472) += int3472/ diff --git a/drivers/platform/x86/intel/ifs/Kconfig b/drivers/platform/x86/intel/ifs/Kconfig new file mode 100644 index 000000000000..88e3d4fa1759 --- /dev/null +++ b/drivers/platform/x86/intel/ifs/Kconfig @@ -0,0 +1,9 @@ +config INTEL_IFS + tristate "Intel In Field Scan" + depends on X86 && 64BIT && SMP + help + Enable support for In Field Scan in Intel CPU to perform core + logic test in the field. To compile this driver as a module, choose + M here. The module will be called intel_ifs. + + If unsure, say N. diff --git a/drivers/platform/x86/intel/ifs/Makefile b/drivers/platform/x86/intel/ifs/Makefile new file mode 100644 index 000000000000..c44305dff542 --- /dev/null +++ b/drivers/platform/x86/intel/ifs/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_INTEL_IFS) += intel_ifs.o + +intel_ifs-objs := core.o diff --git a/drivers/platform/x86/intel/ifs/core.c b/drivers/platform/x86/intel/ifs/core.c new file mode 100644 index 000000000000..87956623208f --- /dev/null +++ b/drivers/platform/x86/intel/ifs/core.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2022 Intel Corporation. */ + +#include <linux/module.h> +#include <asm/cpu_device_id.h> + +#include "ifs.h" + +#define X86_MATCH(model) \ + X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, \ + INTEL_FAM6_##model, X86_FEATURE_CORE_CAPABILITIES, NULL) + +static const struct x86_cpu_id ifs_cpu_ids[] __initconst = { + X86_MATCH(SAPPHIRERAPIDS_X), + {} +}; + +MODULE_DEVICE_TABLE(x86cpu, ifs_cpu_ids); + +static int __init ifs_init(void) +{ + const struct x86_cpu_id *m; + u64 ia32_core_caps; + + /* ifs capability check */ + m = x86_match_cpu(ifs_cpu_ids); + if (!m) + return -ENODEV; + if (rdmsrl_safe(MSR_IA32_CORE_CAPS, &ia32_core_caps)) + return -ENODEV; + if (!(ia32_core_caps & MSR_IA32_CORE_CAPS_INTEGRITY)) + return -ENODEV; + + return 0; +} + +static void __exit ifs_exit(void) +{ +} + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Intel In Field Scan (IFS) driver"); +module_init(ifs_init); +module_exit(ifs_exit); diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h new file mode 100644 index 000000000000..bb25a4cd3af6 --- /dev/null +++ b/drivers/platform/x86/intel/ifs/ifs.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright(c) 2022 Intel Corporation. */ + +#ifndef _IFS_H_ +#define _IFS_H_ + +/* These bits are in the IA32_CORE_CAPABILITIES MSR */ +#define MSR_IA32_CORE_CAPS_INTEGRITY_BIT 2 +#define MSR_IA32_CORE_CAPS_INTEGRITY BIT(MSR_IA32_CORE_CAPS_INTEGRITY_BIT) + +#endif -- 2.17.1
