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

soc/amd/common/cpu: Add Kconfig to program the PSP_ADDR MSR 

The PSP_ADDR_MSR is programmed into the BSP by FSP, but not always
propagated to the other cores/APs. Add a hook to run a function
which will read the MSR value from the BSP, and program it into the
APs, guarded by a Kconfig. SoCs which wish to utilize this feature
can select the Kconfig.

BUG=b:293571109
BRANCH=skyrim
TEST=tested with rest of patch train

Change-Id: I14af1a092965254979df404d8d7d9a28a15b44b8
Signed-off-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76808
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
This commit is contained in:
Matt DeVillier 2023-07-28 13:43:36 -05:00 committed by Felix Held
parent 3bd83b27af
commit 3a795e0b23
2 changed files with 40 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/soc/amd/common/block/cpu/Kconfig
View File

@ -106,6 +106,12 @@ config SOC_AMD_COMMON_BLOCK_TSC
frequency of AMD family 17h, 19h and 1Ah CPUs/APUs and to provide
TSC-based monotonic timer functionality to the build.
config SOC_AMD_COMMON_BLOCK_CPU_SYNC_PSP_ADDR_MSR
bool
help
Select this option to have coreboot sync the PSP_ADDR_MSR from
the BSP to all APs.
config SOC_AMD_COMMON_BLOCK_UCODE
bool
help

34
src/soc/amd/common/block/cpu/cpu.c
View File

@ -2,8 +2,12 @@
#include <acpi/acpi.h>
#include <amdblocks/cpu.h>
#include <console/console.h>
#include <cpu/amd/cpuid.h>
#include <cpu/amd/msr.h>
#include <cpu/cpu.h>
#include <cpu/x86/mp.h>
#include <cpu/x86/msr.h>
#include <device/device.h>
int get_cpu_count(void)
@ -17,6 +21,35 @@ unsigned int get_threads_per_core(void)
>> CPUID_EBX_THREADS_SHIFT);
}
/* Being called via mp_run_on_all_cpus() ensures this will run on the BSP first, then APs */
static void sync_psp_addr_msr(void *unused)
{
static msr_t psp_addr_base;
msr_t msr_temp;
if (psp_addr_base.raw == 0ul) {
msr_temp = rdmsr(PSP_ADDR_MSR);
if (msr_temp.raw == 0ul) {
printk(BIOS_ERR, "PSP_ADDR_MSR on BSP is 0; cannot program MSR on APs\n");
return;
}
psp_addr_base.lo = msr_temp.lo;
printk(BIOS_SPEW, "Read PSP_ADDR_MSR 0x%x from BSP\n", psp_addr_base.lo);
} else {
msr_temp = rdmsr(PSP_ADDR_MSR);
if (msr_temp.raw == 0ul) {
wrmsr(PSP_ADDR_MSR, psp_addr_base);
printk(BIOS_SPEW, "Wrote PSP_ADDR_MSR 0x%x to AP\n", psp_addr_base.lo);
}
}
}
static void post_mp_init(struct device *unused)
{
if (CONFIG(SOC_AMD_COMMON_BLOCK_CPU_SYNC_PSP_ADDR_MSR))
mp_run_on_all_cpus(sync_psp_addr_msr, NULL);
}
struct device_operations amd_cpu_bus_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
@ -24,4 +57,5 @@ struct device_operations amd_cpu_bus_ops = {
#if CONFIG(HAVE_ACPI_TABLES)
.acpi_fill_ssdt = generate_cpu_entries,
#endif
.final = post_mp_init,
};