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x86/cpu/amd: Move TOPOEXT enablement into the topology parser 

The topology rework missed that early_init_amd() tries to re-enable the
Topology Extensions when the BIOS disabled them.

The new parser is invoked before early_init_amd() so the re-enable attempt
happens too late.

Move it into the AMD specific topology parser code where it belongs.

Fixes: f7fb3b2dd9 ("x86/cpu: Provide an AMD/HYGON specific topology parser")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/878r1j260l.ffs@tglx
This commit is contained in:
Thomas Gleixner 2024-04-11 18:55:38 +02:00 committed by Ingo Molnar
parent c064b536a8
commit 7211274fe0
2 changed files with 21 additions and 15 deletions
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15
arch/x86/kernel/cpu/amd.c
View File

@ -535,7 +535,6 @@ clear_sev:
static void early_init_amd(struct cpuinfo_x86 *c)
{
u64 value;
u32 dummy;
if (c->x86 >= 0xf)
@ -603,20 +602,6 @@ static void early_init_amd(struct cpuinfo_x86 *c)
early_detect_mem_encrypt(c);
/* Re-enable TopologyExtensions if switched off by BIOS */
if (c->x86 == 0x15 &&
(c->x86_model >= 0x10 && c->x86_model <= 0x6f) &&
!cpu_has(c, X86_FEATURE_TOPOEXT)) {
if (msr_set_bit(0xc0011005, 54) > 0) {
rdmsrl(0xc0011005, value);
if (value & BIT_64(54)) {
set_cpu_cap(c, X86_FEATURE_TOPOEXT);
pr_info_once(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n");
}
}
}
if (!cpu_has(c, X86_FEATURE_HYPERVISOR) && !cpu_has(c, X86_FEATURE_IBPB_BRTYPE)) {
if (c->x86 == 0x17 && boot_cpu_has(X86_FEATURE_AMD_IBPB))
setup_force_cpu_cap(X86_FEATURE_IBPB_BRTYPE);

21
arch/x86/kernel/cpu/topology_amd.c
View File

@ -147,6 +147,26 @@ static void legacy_set_llc(struct topo_scan *tscan)
tscan->c->topo.llc_id = apicid >> tscan->dom_shifts[TOPO_CORE_DOMAIN];
}
static void topoext_fixup(struct topo_scan *tscan)
{
struct cpuinfo_x86 *c = tscan->c;
u64 msrval;
/* Try to re-enable TopologyExtensions if switched off by BIOS */
if (cpu_has(c, X86_FEATURE_TOPOEXT) || c->x86_vendor != X86_VENDOR_AMD ||
c->x86 != 0x15 || c->x86_model < 0x10 || c->x86_model > 0x6f)
return;
if (msr_set_bit(0xc0011005, 54) <= 0)
return;
rdmsrl(0xc0011005, msrval);
if (msrval & BIT_64(54)) {
set_cpu_cap(c, X86_FEATURE_TOPOEXT);
pr_info_once(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n");
}
}
static void parse_topology_amd(struct topo_scan *tscan)
{
bool has_0xb = false;
@ -176,6 +196,7 @@ static void parse_topology_amd(struct topo_scan *tscan)
void cpu_parse_topology_amd(struct topo_scan *tscan)
{
tscan->amd_nodes_per_pkg = 1;
topoext_fixup(tscan);
parse_topology_amd(tscan);
if (tscan->amd_nodes_per_pkg > 1)