GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Angel Pons 2021-01-04 17:56:44 +01:00 committed by Nico Huber
parent a554122553
commit 11235d6875
1 changed files with 4 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/cpu/intel/haswell/acpi.c
View File

@ -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",