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| author | Angel Pons <th3fanbus@gmail.com> | 2021-01-04 17:56:44 +0100 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2021-02-12 19:29:07 +0000 |
| commit | 11235d68750ff2274e21571210f95c018a295a36 (patch) | |
| tree | f187ce9da1a67078d74aea48cbe9760d1122f265 /src/cpu | |
| parent | a5541225531a8b4ab12b01587b5cb8ba6c5168e9 (diff) | |
| download | coreboot-11235d68750ff2274e21571210f95c018a295a36.tar.xz | |
cpu/intel/haswell/acpi.c: Correct `get_cores_per_package`
CPUID result does not change when HyperThreading is disabled on
HT-enabled CPUs, which breaks `generate_cpu_entries`. Use MSR 0x35
instead, which returns the currently-enabled core and thread count.
Also rename the function to `get_logical_cores_per_package, which is
more accurate. Based on commit 920d2b77f2 (cpu/intel/206ax/acpi.c: Fix
get_cores_per_package). The MSR definition is the same for Sandy Bridge
and Haswell.
Change-Id: I5e1789d3037780b4285c9e367ff0e2b0d4365b39
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49099
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/intel/haswell/acpi.c | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/src/cpu/intel/haswell/acpi.c b/src/cpu/intel/haswell/acpi.c index 0f11e5f8d9..401e82bcf0 100644 --- a/src/cpu/intel/haswell/acpi.c +++ b/src/cpu/intel/haswell/acpi.c @@ -32,20 +32,10 @@ static int cstate_set_trad[3] = { C_STATE_C6_LONG_LAT, }; -static int get_cores_per_package(void) +static int get_logical_cores_per_package(void) { - struct cpuinfo_x86 c; - struct cpuid_result result; - int cores = 1; - - get_fms(&c, cpuid_eax(1)); - if (c.x86 != 6) - return 1; - - result = cpuid_ext(0xb, 1); - cores = result.ebx & 0xff; - - return cores; + msr_t msr = rdmsr(MSR_CORE_THREAD_COUNT); + return msr.lo & 0xffff; } static acpi_tstate_t tss_table_fine[] = { @@ -279,7 +269,7 @@ void generate_cpu_entries(const struct device *device) { int coreID, cpuID, pcontrol_blk = get_pmbase(), plen = 6; int totalcores = dev_count_cpu(); - int cores_per_package = get_cores_per_package(); + int cores_per_package = get_logical_cores_per_package(); int numcpus = totalcores/cores_per_package; printk(BIOS_DEBUG, "Found %d CPU(s) with %d core(s) each.\n", |