In-Field Scan (IFS) provides hardware hooks to perform core tests and report failures for portions of silicon that lack error detection capabilities, which will be available in some server SKUs starting with Sapphire Rapids. It offers infrastructure to specific users such as cloud providers or OEMs to schedule tests and find in-field failures due to aging in silicon that might not necessarily be reported with normal machine checks. 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. Originally-by: Kyung Min Park <kyung.min.park@xxxxxxxxx> Signed-off-by: Jithu Joseph <jithu.joseph@xxxxxxxxx> Reviewed-by: Ashok Raj <ashok.raj@xxxxxxxxx> Reviewed-by: Tony Luck <tony.luck@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 | 7 ++++ drivers/platform/x86/intel/ifs/core.c | 49 +++++++++++++++++++++++++ drivers/platform/x86/intel/ifs/ifs.h | 14 +++++++ 7 files changed, 88 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-$(CONFIG_INTEL_SKL_INT3472) += int3472/ diff --git a/drivers/platform/x86/intel/ifs/Kconfig b/drivers/platform/x86/intel/ifs/Kconfig new file mode 100644 index 000000000000..88e3d4fa1759 --- /dev/null +++ b/drivers/platform/x86/intel/ifs/Kconfig @@ -0,0 +1,9 @@ +config INTEL_IFS + tristate "Intel In Field Scan" + depends on X86 && 64BIT && SMP + help + Enable support for In Field Scan in Intel CPU to perform core + logic test in the field. To compile this driver as a module, choose + M here. The module will be called intel_ifs. + + If unsure, say N. diff --git a/drivers/platform/x86/intel/ifs/Makefile b/drivers/platform/x86/intel/ifs/Makefile new file mode 100644 index 000000000000..05b4925402b4 --- /dev/null +++ b/drivers/platform/x86/intel/ifs/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for the In-Field Scan driver +# + +obj-$(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..fb3c864d3085 --- /dev/null +++ b/drivers/platform/x86/intel/ifs/core.c @@ -0,0 +1,49 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2021 Intel Corporation. + * + * Author: Jithu Joseph <jithu.joseph@xxxxxxxxx> + */ + +#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) +{ + pr_info("unloaded 'In-Field Scan' module\n"); +} + +MODULE_LICENSE("GPL"); +MODULE_INFO(name, "ifs"); +MODULE_DESCRIPTION("ifs"); +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..f3f924fced06 --- /dev/null +++ b/drivers/platform/x86/intel/ifs/ifs.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright(c) 2021 Intel Corporation. + * + * Author: Jithu Joseph <jithu.joseph@xxxxxxxxx> + */ + +#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
