[patch V4 41/41] x86/apic/uv: Remove the private leaf 0xb parser

Thomas Gleixner
2023-08-14T08:57:13Z

The package shift has been already evaluated by the early CPU init.

Put the mindless copy right next to the original leaf 0xb parser.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Michael Kelley <mikelley@microsoft.com>

---
arch/x86/include/asm/topology.h | 5 +++
arch/x86/kernel/apic/x2apic_uv_x.c | 52 ++++++-------------------------------
2 files changed, 14 insertions(+), 43 deletions(-)

--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -126,6 +126,11 @@ static inline unsigned int topology_get_
return x86_topo_system.dom_size[dom];
}

+static inline unsigned int topology_get_domain_shift(enum x86_topology_domains dom)
+{
+ return dom == TOPO_SMT_DOMAIN ? 0 : x86_topo_system.dom_shifts[dom - 1];
+}
+
extern const struct cpumask *cpu_coregroup_mask(int cpu);
extern const struct cpumask *cpu_clustergroup_mask(int cpu);

--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -241,54 +241,20 @@ static void __init uv_tsc_check_sync(voi
is_uv(UV3) ? sname.s3.field : \
undef)

-/* [Copied from arch/x86/kernel/cpu/topology.c:detect_extended_topology()] */
-
-#define SMT_LEVEL 0 /* Leaf 0xb SMT level */
-#define INVALID_TYPE 0 /* Leaf 0xb sub-leaf types */
-#define SMT_TYPE 1
-#define CORE_TYPE 2
-#define LEAFB_SUBTYPE(ecx) (((ecx) >> 8) & 0xff)
-#define BITS_SHIFT_NEXT_LEVEL(eax) ((eax) & 0x1f)
-
-static void set_x2apic_bits(void)
-{
- unsigned int eax, ebx, ecx, edx, sub_index;
- unsigned int sid_shift;
-
- cpuid(0, &eax, &ebx, &ecx, &edx);
- if (eax < 0xb) {
- pr_info("UV: CPU does not have CPUID.11\n");
- return;
- }
-
- cpuid_count(0xb, SMT_LEVEL, &eax, &ebx, &ecx, &edx);
- if (ebx == 0 || (LEAFB_SUBTYPE(ecx) != SMT_TYPE)) {
- pr_info("UV: CPUID.11 not implemented\n");
- return;
- }
-
- sid_shift = BITS_SHIFT_NEXT_LEVEL(eax);
- sub_index = 1;
- do {
- cpuid_count(0xb, sub_index, &eax, &ebx, &ecx, &edx);
- if (LEAFB_SUBTYPE(ecx) == CORE_TYPE) {
- sid_shift = BITS_SHIFT_NEXT_LEVEL(eax);
- break;
- }
- sub_index++;
- } while (LEAFB_SUBTYPE(ecx) != INVALID_TYPE);
-
- uv_cpuid.apicid_shift = 0;
- uv_cpuid.apicid_mask = (~(-1 << sid_shift));
- uv_cpuid.socketid_shift = sid_shift;
-}
-
static void __init early_get_apic_socketid_shift(void)
{
+ unsigned int sid_shift = topology_get_domain_shift(TOPO_ROOT_DOMAIN);
+
if (is_uv2_hub() || is_uv3_hub())
uvh_apicid.v = uv_early_read_mmr(UVH_APICID);

- set_x2apic_bits();
+ if (sid_shift) {
+ uv_cpuid.apicid_shift = 0;
+ uv_cpuid.apicid_mask = (~(-1 << sid_shift));
+ uv_cpuid.socketid_shift = sid_shift;
+ } else {
+ pr_info("UV: CPU does not have valid CPUID.11\n");
+ }

pr_info("UV: apicid_shift:%d apicid_mask:0x%x\n", uv_cpuid.apicid_shift, uv_cpuid.apicid_mask);
pr_info("UV: socketid_shift:%d pnode_mask:0x%x\n", uv_cpuid.socketid_shift, uv_cpuid.pnode_mask);