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Misc x86 fixes:

Browse source 
- Fix resctrl initialization on Hygon CPUs
 
  - Fix resctrl memory bandwidth counters
    on Hygon CPUs
 
  - Fix x86 self-tests build bug
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2026-01-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull misc x86 fixes from Ingo Molnar:

 - Fix resctrl initialization on Hygon CPUs

 - Fix resctrl memory bandwidth counters on Hygon CPUs

 - Fix x86 self-tests build bug

* tag 'x86-urgent-2026-01-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  selftests/x86: Add selftests include path for kselftest.h after centralization
  x86/resctrl: Fix memory bandwidth counter width for Hygon
  x86/resctrl: Add missing resctrl initialization for Hygon
This commit is contained in:
Linus Torvalds 2026-01-18 11:34:11 -08:00
commit e503f539dc
3 changed files with 21 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

21
arch/x86/kernel/cpu/resctrl/core.c
View file

@ -825,7 +825,8 @@ static __init bool get_mem_config(void)
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
return __get_mem_config_intel(&hw_res->r_resctrl);
else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
return __rdt_get_mem_config_amd(&hw_res->r_resctrl);
return false;
@ -987,7 +988,8 @@ static __init void rdt_init_res_defs(void)
{
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
rdt_init_res_defs_intel();
else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
rdt_init_res_defs_amd();
}
@ -1019,8 +1021,19 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)
c->x86_cache_occ_scale = ebx;
c->x86_cache_mbm_width_offset = eax & 0xff;
if (c->x86_vendor == X86_VENDOR_AMD && !c->x86_cache_mbm_width_offset)
c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_AMD;
if (!c->x86_cache_mbm_width_offset) {
switch (c->x86_vendor) {
case X86_VENDOR_AMD:
c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_AMD;
break;
case X86_VENDOR_HYGON:
c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_HYGON;
break;
default:
/* Leave c->x86_cache_mbm_width_offset as 0 */
break;
}
}
}
}

3
arch/x86/kernel/cpu/resctrl/internal.h
View file

@ -14,6 +14,9 @@
#define MBM_CNTR_WIDTH_OFFSET_AMD 20
/* Hygon MBM counter width as an offset from MBM_CNTR_WIDTH_BASE */
#define MBM_CNTR_WIDTH_OFFSET_HYGON 8
#define RMID_VAL_ERROR BIT_ULL(63)
#define RMID_VAL_UNAVAIL BIT_ULL(62)

1
tools/testing/selftests/x86/Makefile
View file

@ -36,6 +36,7 @@ BINARIES_32 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_32))
BINARIES_64 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_64))
CFLAGS := -O2 -g -std=gnu99 -pthread -Wall $(KHDR_INCLUDES)
CFLAGS += -I $(top_srcdir)/tools/testing/selftests/
# call32_from_64 in thunks.S uses absolute addresses.
ifeq ($(CAN_BUILD_WITH_NOPIE),1)