[RFC PATCH 01/17] x86/rectrl: Fake OOBMSM interface
From: Tony Luck
Date: Mon Mar 03 2025 - 18:35:11 EST
Real version is coming soon ... this is here so the remaining parts
will build (and run ... assuming a 2 socket system that supports RDT
monitoring ... only missing part is that the event counters just
report fixed values).
Real version of this would just add the INTEL_PMT_RESCTRL Kconfig
option with dependency checks on
INTEL_VSEC=y && INTEL_PMT_TELEMETRY=y && INTEL_PMT_DISCOVERY=y
Just for RFC discussion.
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
.../cpu/resctrl/fake_intel_pmt_features.h | 72 +++++++++++++++++++
.../cpu/resctrl/fake_intel_pmt_features.c | 64 +++++++++++++++++
arch/x86/Kconfig | 1 +
arch/x86/kernel/cpu/resctrl/Makefile | 1 +
drivers/platform/x86/intel/pmt/Kconfig | 3 +
5 files changed, 141 insertions(+)
create mode 100644 arch/x86/kernel/cpu/resctrl/fake_intel_pmt_features.h
create mode 100644 arch/x86/kernel/cpu/resctrl/fake_intel_pmt_features.c
diff --git a/arch/x86/kernel/cpu/resctrl/fake_intel_pmt_features.h b/arch/x86/kernel/cpu/resctrl/fake_intel_pmt_features.h
new file mode 100644
index 000000000000..52fdd04e5094
--- /dev/null
+++ b/arch/x86/kernel/cpu/resctrl/fake_intel_pmt_features.h
@@ -0,0 +1,72 @@
+
+/* Bits stolen from OOBMSM VSEC discovery code */
+
+enum pmt_feature_id {
+ FEATURE_INVALID = 0x0,
+ FEATURE_PER_CORE_PERF_TELEM = 0x1,
+ FEATURE_PER_CORE_ENV_TELEM = 0x2,
+ FEATURE_PER_RMID_PERF_TELEM = 0x3,
+ FEATURE_ACCEL_TELEM = 0x4,
+ FEATURE_UNCORE_TELEM = 0x5,
+ FEATURE_CRASH_LOG = 0x6,
+ FEATURE_PETE_LOG = 0x7,
+ FEATURE_TPMI_CTRL = 0x8,
+ FEATURE_RESERVED = 0x9,
+ FEATURE_TRACING = 0xA,
+ FEATURE_PER_RMID_ENERGY_TELEM = 0xB,
+ FEATURE_MAX = 0xB,
+};
+
+/**
+ * struct oobmsm_plat_info - Platform information for a device instance
+ * @cdie_mask: Mask of all compute dies in the partition
+ * @package_id: CPU Package id
+ * @partition: Package partition id when multiple VSEC PCI devices per package
+ * @segment: PCI segment ID
+ * @bus_number: PCI bus number
+ * @device_number: PCI device number
+ * @function_number: PCI function number
+ *
+ * Structure to store platform data for a OOBMSM device instance.
+ */
+struct oobmsm_plat_info {
+ u16 cdie_mask;
+ u8 package_id;
+ u8 partition;
+ u8 segment;
+ u8 bus_number;
+ u8 device_number;
+ u8 function_number;
+};
+
+enum oobmsm_supplier_type {
+ OOBMSM_SUP_PLAT_INFO,
+ OOBMSM_SUP_DISC_INFO,
+ OOBMSM_SUP_S3M_SIMICS,
+ OOBMSM_SUP_TYPE_MAX
+};
+
+struct oobmsm_mapping_supplier {
+ struct device *supplier_dev[OOBMSM_SUP_TYPE_MAX];
+ struct oobmsm_plat_info plat_info;
+ unsigned long features;
+};
+
+struct telemetry_region {
+ struct oobmsm_plat_info plat_info;
+ void __iomem *addr;
+ size_t size;
+ u32 guid;
+ u32 num_rmids;
+};
+
+struct pmt_feature_group {
+ enum pmt_feature_id id;
+ int count;
+ struct kref kref;
+ struct telemetry_region regions[];
+};
+
+struct pmt_feature_group *intel_pmt_get_regions_by_feature(enum pmt_feature_id id);
+
+void intel_pmt_put_feature_group(struct pmt_feature_group *feature_group);
diff --git a/arch/x86/kernel/cpu/resctrl/fake_intel_pmt_features.c b/arch/x86/kernel/cpu/resctrl/fake_intel_pmt_features.c
new file mode 100644
index 000000000000..6d27cf1a151b
--- /dev/null
+++ b/arch/x86/kernel/cpu/resctrl/fake_intel_pmt_features.c
@@ -0,0 +1,64 @@
+#include <linux/cleanup.h>
+#include <linux/minmax.h>
+#include <linux/slab.h>
+#include "fake_intel_pmt_features.h"
+#include <linux/intel_vsec.h>
+#include <asm/resctrl.h>
+
+#include "internal.h"
+
+#define ENERGY_QWORDS ((576 * 2) + 3)
+#define PERF_QWORDS ((576 * 7) + 3)
+
+static long pg[4 * ENERGY_QWORDS + 2 * PERF_QWORDS];
+
+static int __init fill(void)
+{
+ u64 val = 0;
+
+ for (int i = 0; i < sizeof(pg); i += sizeof(val)) {
+ pg[i / sizeof(val)] = BIT_ULL(63) + val;
+ val++;
+ }
+ return 0;
+}
+device_initcall(fill);
+
+#define PKG_REGION(_entry, _guid, _addr, _pkg) \
+ [_entry] = { .guid = _guid, .addr = _addr, .plat_info = { .package_id = _pkg }}
+
+static struct pmt_feature_group fake_energy = {
+ .count = 4,
+ .regions = {
+ PKG_REGION(0, 0x26696143, &pg[0 * ENERGY_QWORDS], 0),
+ PKG_REGION(1, 0x26696143, &pg[1 * ENERGY_QWORDS], 0),
+ PKG_REGION(2, 0x26696143, &pg[2 * ENERGY_QWORDS], 1),
+ PKG_REGION(3, 0x26696143, &pg[3 * ENERGY_QWORDS], 1)
+ }
+};
+
+static struct pmt_feature_group fake_perf = {
+ .count = 2,
+ .regions = {
+ PKG_REGION(0, 0x26557651, &pg[4 * ENERGY_QWORDS + 0 * PERF_QWORDS], 0),
+ PKG_REGION(1, 0x26557651, &pg[4 * ENERGY_QWORDS + 1 * PERF_QWORDS], 1)
+ }
+};
+
+struct pmt_feature_group *
+intel_pmt_get_regions_by_feature(enum pmt_feature_id id)
+{
+ switch (id) {
+ case FEATURE_PER_RMID_ENERGY_TELEM:
+ return &fake_energy;
+ case FEATURE_PER_RMID_PERF_TELEM:
+ return &fake_perf;
+ default:
+ return ERR_PTR(-ENOENT);
+ }
+ return ERR_PTR(-ENOENT);
+}
+
+void intel_pmt_put_feature_group(struct pmt_feature_group *feature_group)
+{
+}
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index be2c311f5118..ec6a7b996e09 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -505,6 +505,7 @@ config X86_CPU_RESCTRL
depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
select KERNFS
select PROC_CPU_RESCTRL if PROC_FS
+ select INTEL_PMT_RESCTRL
help
Enable x86 CPU resource control support.
diff --git a/arch/x86/kernel/cpu/resctrl/Makefile b/arch/x86/kernel/cpu/resctrl/Makefile
index 4a06c37b9cf1..72621ea6cd6a 100644
--- a/arch/x86/kernel/cpu/resctrl/Makefile
+++ b/arch/x86/kernel/cpu/resctrl/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_X86_CPU_RESCTRL) += core.o rdtgroup.o monitor.o
obj-$(CONFIG_X86_CPU_RESCTRL) += ctrlmondata.o pseudo_lock.o
+obj-$(CONFIG_INTEL_PMT_RESCTRL) += fake_intel_pmt_features.o
CFLAGS_pseudo_lock.o = -I$(src)
diff --git a/drivers/platform/x86/intel/pmt/Kconfig b/drivers/platform/x86/intel/pmt/Kconfig
index e916fc966221..4cbfd8a42252 100644
--- a/drivers/platform/x86/intel/pmt/Kconfig
+++ b/drivers/platform/x86/intel/pmt/Kconfig
@@ -38,3 +38,6 @@ config INTEL_PMT_CRASHLOG
To compile this driver as a module, choose M here: the module
will be called intel_pmt_crashlog.
+
+config INTEL_PMT_RESCTRL
+ bool
--
2.48.1