linux-kernel - [tip: x86/urgent] x86/topology: Don't evaluate logical IDs during early boot

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Message-ID: <171120029008.10875.1770752524543764937.tip-bot2@tip-bot2>
Date: Sat, 23 Mar 2024 13:24:50 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 "Borislav Petkov (AMD)" <bp@...en8.de>, Guenter Roeck <linux@...ck-us.net>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: x86/urgent] x86/topology: Don't evaluate logical IDs during early boot

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     7af541cee1e0eb48c6eb439bc6309175339fa96f
Gitweb:        https://git.kernel.org/tip/7af541cee1e0eb48c6eb439bc6309175339fa96f
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Fri, 22 Mar 2024 19:56:36 +01:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Sat, 23 Mar 2024 12:28:06 +01:00

x86/topology: Don't evaluate logical IDs during early boot

The local APICs have not yet been enumerated so the logical ID evaluation
from the topology bitmaps does not work and would return an error code.

Skip the evaluation during the early boot CPUID evaluation and only apply
it on the final run.

Fixes: 380414be78bf ("x86/cpu/topology: Use topology logical mapping mechanism")
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Tested-by: Guenter Roeck <linux@...ck-us.net>
Link: https://lore.kernel.org/r/20240322185305.186943142@linutronix.de
---
 arch/x86/kernel/cpu/topology_common.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/topology_common.c b/arch/x86/kernel/cpu/topology_common.c
index a50ae8d..9a6069e 100644
--- a/arch/x86/kernel/cpu/topology_common.c
+++ b/arch/x86/kernel/cpu/topology_common.c
@@ -140,7 +140,7 @@ static void parse_topology(struct topo_scan *tscan, bool early)
 	}
 }
 
-static void topo_set_ids(struct topo_scan *tscan)
+static void topo_set_ids(struct topo_scan *tscan, bool early)
 {
 	struct cpuinfo_x86 *c = tscan->c;
 	u32 apicid = c->topo.apicid;
@@ -148,8 +148,10 @@ static void topo_set_ids(struct topo_scan *tscan)
 	c->topo.pkg_id = topo_shift_apicid(apicid, TOPO_PKG_DOMAIN);
 	c->topo.die_id = topo_shift_apicid(apicid, TOPO_DIE_DOMAIN);
 
-	c->topo.logical_pkg_id = topology_get_logical_id(apicid, TOPO_PKG_DOMAIN);
-	c->topo.logical_die_id = topology_get_logical_id(apicid, TOPO_DIE_DOMAIN);
+	if (!early) {
+		c->topo.logical_pkg_id = topology_get_logical_id(apicid, TOPO_PKG_DOMAIN);
+		c->topo.logical_die_id = topology_get_logical_id(apicid, TOPO_DIE_DOMAIN);
+	}
 
 	/* Package relative core ID */
 	c->topo.core_id = (apicid & topo_domain_mask(TOPO_PKG_DOMAIN)) >>
@@ -187,7 +189,7 @@ void cpu_parse_topology(struct cpuinfo_x86 *c)
 		       tscan.dom_shifts[dom], x86_topo_system.dom_shifts[dom]);
 	}
 
-	topo_set_ids(&tscan);
+	topo_set_ids(&tscan, false);
 }
 
 void __init cpu_init_topology(struct cpuinfo_x86 *c)
@@ -208,7 +210,7 @@ void __init cpu_init_topology(struct cpuinfo_x86 *c)
 		x86_topo_system.dom_size[dom] = 1U << sft;
 	}
 
-	topo_set_ids(&tscan);
+	topo_set_ids(&tscan, true);
 
 	/*
 	 * AMD systems have Nodes per package which cannot be mapped to