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Message-ID: <20230801103816.912957912@linutronix.de>
From:   Thomas Gleixner <tglx@linutronix.de>
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     x86@kernel.org, Andrew Cooper <andrew.cooper3@citrix.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Wei Liu <wei.liu@kernel.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Juergen Gross <jgross@suse.com>,
        Michael Kelley <mikelley@microsoft.com>,
        Peter Keresztes Schmidt <peter@keresztesschmidt.de>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>
Subject: [patch V3 32/60] x86/apic: Mop up apic::apic_id_registered()
References: <20230801103042.936020332@linutronix.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Date:   Tue,  1 Aug 2023 12:47:20 +0200 (CEST)
Precedence: bulk

Really not a hotpath and again no reason for having a gazillion of empty
callbacks returning 1. Make it return bool and provide one shared
implementation for the remaining users.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 arch/x86/include/asm/apic.h           |    2 +-
 arch/x86/kernel/apic/apic.c           |    7 ++-----
 arch/x86/kernel/apic/apic_common.c    |    5 +++++
 arch/x86/kernel/apic/apic_flat_64.c   |   14 ++------------
 arch/x86/kernel/apic/apic_noop.c      |   12 ------------
 arch/x86/kernel/apic/apic_numachip.c  |    7 -------
 arch/x86/kernel/apic/bigsmp_32.c      |    6 ------
 arch/x86/kernel/apic/local.h          |    3 ++-
 arch/x86/kernel/apic/probe_32.c       |    5 -----
 arch/x86/kernel/apic/x2apic_cluster.c |    1 -
 arch/x86/kernel/apic/x2apic_phys.c    |    6 ------
 arch/x86/kernel/apic/x2apic_uv_x.c    |    6 ------
 arch/x86/xen/apic.c                   |    6 ------
 13 files changed, 12 insertions(+), 68 deletions(-)

--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -295,7 +295,7 @@ struct apic {
 	int	(*probe)(void);
 	int	(*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
 	int	(*apic_id_valid)(u32 apicid);
-	int	(*apic_id_registered)(void);
+	bool	(*apic_id_registered)(void);
 
 	bool	(*check_apicid_used)(physid_mask_t *map, int apicid);
 	void	(*init_apic_ldr)(void);
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1571,11 +1571,8 @@ static void setup_local_APIC(void)
 		apic_write(APIC_ESR, 0);
 	}
 #endif
-	/*
-	 * Double-check whether this APIC is really registered.
-	 * This is meaningless in clustered apic mode, so we skip it.
-	 */
-	BUG_ON(!apic->apic_id_registered());
+	/* Validate that the APIC is registered if required */
+	BUG_ON(apic->apic_id_registered && !apic->apic_id_registered());
 
 	/*
 	 * Intel recommends to set DFR, LDR and TPR before enabling
--- a/arch/x86/kernel/apic/apic_common.c
+++ b/arch/x86/kernel/apic/apic_common.c
@@ -42,6 +42,11 @@ int default_apic_id_valid(u32 apicid)
 	return (apicid < 255);
 }
 
+bool default_apic_id_registered(void)
+{
+	return physid_isset(read_apic_id(), phys_cpu_present_map);
+}
+
 /*
  * Set up the logical destination ID when the APIC operates in logical
  * destination mode.
--- a/arch/x86/kernel/apic/apic_flat_64.c
+++ b/arch/x86/kernel/apic/apic_flat_64.c
@@ -66,16 +66,6 @@ static u32 set_apic_id(unsigned int id)
 	return (id & 0xFF) << 24;
 }
 
-static unsigned int read_xapic_id(void)
-{
-	return flat_get_apic_id(apic_read(APIC_ID));
-}
-
-static int flat_apic_id_registered(void)
-{
-	return physid_isset(read_xapic_id(), phys_cpu_present_map);
-}
-
 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
 {
 	return initial_apic_id >> index_msb;
@@ -91,7 +81,7 @@ static struct apic apic_flat __ro_after_
 	.probe				= flat_probe,
 	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
 	.apic_id_valid			= default_apic_id_valid,
-	.apic_id_registered		= flat_apic_id_registered,
+	.apic_id_registered		= default_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,
@@ -168,7 +158,7 @@ static struct apic apic_physflat __ro_af
 	.probe				= physflat_probe,
 	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
 	.apic_id_valid			= default_apic_id_valid,
-	.apic_id_registered		= flat_apic_id_registered,
+	.apic_id_registered		= default_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
--- a/arch/x86/kernel/apic/apic_noop.c
+++ b/arch/x86/kernel/apic/apic_noop.c
@@ -57,17 +57,6 @@ static int noop_probe(void)
 	return 0;
 }
 
-static int noop_apic_id_registered(void)
-{
-	/*
-	 * if we would be really "pedantic"
-	 * we should pass read_apic_id() here
-	 * but since NOOP suppose APIC ID = 0
-	 * lets save a few cycles
-	 */
-	return physid_isset(0, phys_cpu_present_map);
-}
-
 static u32 noop_apic_read(u32 reg)
 {
 	WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !apic_is_disabled);
@@ -85,7 +74,6 @@ struct apic apic_noop __ro_after_init =
 	.acpi_madt_oem_check		= NULL,
 
 	.apic_id_valid			= default_apic_id_valid,
-	.apic_id_registered		= noop_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,
--- a/arch/x86/kernel/apic/apic_numachip.c
+++ b/arch/x86/kernel/apic/apic_numachip.c
@@ -62,11 +62,6 @@ static int numachip_apic_id_valid(u32 ap
 	return 1;
 }
 
-static int numachip_apic_id_registered(void)
-{
-	return 1;
-}
-
 static int numachip_phys_pkg_id(int initial_apic_id, int index_msb)
 {
 	return initial_apic_id >> index_msb;
@@ -244,7 +239,6 @@ static const struct apic apic_numachip1
 	.probe				= numachip1_probe,
 	.acpi_madt_oem_check		= numachip1_acpi_madt_oem_check,
 	.apic_id_valid			= numachip_apic_id_valid,
-	.apic_id_registered		= numachip_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
@@ -286,7 +280,6 @@ static const struct apic apic_numachip2
 	.probe				= numachip2_probe,
 	.acpi_madt_oem_check		= numachip2_acpi_madt_oem_check,
 	.apic_id_valid			= numachip_apic_id_valid,
-	.apic_id_registered		= numachip_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
--- a/arch/x86/kernel/apic/bigsmp_32.c
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -18,11 +18,6 @@ static unsigned bigsmp_get_apic_id(unsig
 	return (x >> 24) & 0xFF;
 }
 
-static int bigsmp_apic_id_registered(void)
-{
-	return 1;
-}
-
 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
 {
 	return false;
@@ -85,7 +80,6 @@ static struct apic apic_bigsmp __ro_afte
 	.name				= "bigsmp",
 	.probe				= probe_bigsmp,
 	.apic_id_valid			= default_apic_id_valid,
-	.apic_id_registered		= bigsmp_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
--- a/arch/x86/kernel/apic/local.h
+++ b/arch/x86/kernel/apic/local.h
@@ -15,7 +15,6 @@
 
 /* X2APIC */
 int x2apic_apic_id_valid(u32 apicid);
-int x2apic_apic_id_registered(void);
 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest);
 unsigned int x2apic_get_apic_id(unsigned long id);
 u32 x2apic_set_apic_id(unsigned int id);
@@ -61,6 +60,8 @@ void default_send_IPI_allbutself(int vec
 void default_send_IPI_all(int vector);
 void default_send_IPI_self(int vector);
 
+bool default_apic_id_registered(void);
+
 #ifdef CONFIG_X86_32
 void default_send_IPI_mask_sequence_logical(const struct cpumask *mask, int vector);
 void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask, int vector);
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -18,11 +18,6 @@
 
 #include "local.h"
 
-static int default_apic_id_registered(void)
-{
-	return physid_isset(read_apic_id(), phys_cpu_present_map);
-}
-
 static int default_phys_pkg_id(int cpuid_apic, int index_msb)
 {
 	return cpuid_apic >> index_msb;
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -237,7 +237,6 @@ static struct apic apic_x2apic_cluster _
 	.probe				= x2apic_cluster_probe,
 	.acpi_madt_oem_check		= x2apic_acpi_madt_oem_check,
 	.apic_id_valid			= x2apic_apic_id_valid,
-	.apic_id_registered		= x2apic_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -111,11 +111,6 @@ int x2apic_apic_id_valid(u32 apicid)
 	return 1;
 }
 
-int x2apic_apic_id_registered(void)
-{
-	return 1;
-}
-
 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
 {
 	unsigned long cfg = __prepare_ICR(0, vector, dest);
@@ -157,7 +152,6 @@ static struct apic apic_x2apic_phys __ro
 	.probe				= x2apic_phys_probe,
 	.acpi_madt_oem_check		= x2apic_acpi_madt_oem_check,
 	.apic_id_valid			= x2apic_apic_id_valid,
-	.apic_id_registered		= x2apic_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -783,11 +783,6 @@ static int uv_apic_id_valid(u32 apicid)
 	return 1;
 }
 
-static int uv_apic_id_registered(void)
-{
-	return 1;
-}
-
 static u32 apic_uv_calc_apicid(unsigned int cpu)
 {
 	return apic_default_calc_apicid(cpu);
@@ -829,7 +824,6 @@ static struct apic apic_x2apic_uv_x __ro
 	.probe				= uv_probe,
 	.acpi_madt_oem_check		= uv_acpi_madt_oem_check,
 	.apic_id_valid			= uv_apic_id_valid,
-	.apic_id_registered		= uv_apic_id_registered,
 
 	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= false,
--- a/arch/x86/xen/apic.c
+++ b/arch/x86/xen/apic.c
@@ -115,11 +115,6 @@ static int xen_id_always_valid(u32 apici
 	return 1;
 }
 
-static int xen_id_always_registered(void)
-{
-	return 1;
-}
-
 static int xen_phys_pkg_id(int initial_apic_id, int index_msb)
 {
 	return initial_apic_id >> index_msb;
@@ -142,7 +137,6 @@ static struct apic xen_pv_apic = {
 	.probe 				= xen_apic_probe_pv,
 	.acpi_madt_oem_check		= xen_madt_oem_check,
 	.apic_id_valid 			= xen_id_always_valid,
-	.apic_id_registered 		= xen_id_always_registered,
 
 	/* .delivery_mode and .dest_mode_logical not used by XENPV */