x86/apic: Get rid of apic->target_cpus

The target_cpus() callback of the apic struct is not really useful. Some
APICs return cpu_online_mask and others cpus_all_mask. The latter is bogus
as it does not take holes in the cpus_possible_mask into account.

Replace it with cpus_online_mask which makes the most sense and remove the
callback.

The usage sites will be removed in a later step anyway, so get rid of it
now to have incremental changes.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Yu Chen <yu.c.chen@intel.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Link: https://lkml.kernel.org/r/20170913213154.070850916@linutronix.de

arch/x86/include/asm/apic.h

@@ -298,7 +298,6 @@ struct apic {
 	u32	irq_dest_mode;
 
 	/* Functions and data related to vector allocation */
-	const struct cpumask *(*target_cpus)(void);
 	void	(*vector_allocation_domain)(int cpu, struct cpumask *retmask,
 					    const struct cpumask *mask);
 	int	(*cpu_mask_to_apicid)(const struct cpumask *cpumask,
@@ -484,8 +483,6 @@ static inline unsigned int read_apic_id(void)
 	return apic->get_apic_id(reg);
 }
 
-extern const struct cpumask *default_target_cpus(void);
-extern const struct cpumask *online_target_cpus(void);
 extern int default_apic_id_valid(int apicid);
 extern int default_acpi_madt_oem_check(char *, char *);
 extern void default_setup_apic_routing(void);

arch/x86/kernel/apic/apic_common.c

@@ -78,20 +78,6 @@ int default_check_phys_apicid_present(int phys_apicid)
 	return physid_isset(phys_apicid, phys_cpu_present_map);
 }
 
-const struct cpumask *default_target_cpus(void)
-{
-#ifdef CONFIG_SMP
-	return cpu_online_mask;
-#else
-	return cpumask_of(0);
-#endif
-}
-
-const struct cpumask *online_target_cpus(void)
-{
-	return cpu_online_mask;
-}
-
 int default_apic_id_valid(int apicid)
 {
 	return (apicid < 255);

arch/x86/kernel/apic/apic_flat_64.c

@@ -154,7 +154,6 @@ static struct apic apic_flat __ro_after_init = {
 	.irq_delivery_mode		= dest_LowestPrio,
 	.irq_dest_mode			= 1, /* logical */
 
-	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= NULL,
@@ -249,7 +248,6 @@ static struct apic apic_physflat __ro_after_init = {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */
 
-	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= 0,
 	.check_apicid_used		= NULL,

arch/x86/kernel/apic/apic_noop.c

@@ -83,12 +83,6 @@ static int noop_apic_id_registered(void)
 	return physid_isset(0, phys_cpu_present_map);
 }
 
-static const struct cpumask *noop_target_cpus(void)
-{
-	/* only BSP here */
-	return cpumask_of(0);
-}
-
 static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask,
 					  const struct cpumask *mask)
 {
@@ -127,7 +121,6 @@ struct apic apic_noop __ro_after_init = {
 	/* logical delivery broadcast to all CPUs: */
 	.irq_dest_mode			= 1,
 
-	.target_cpus			= noop_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= default_check_apicid_used,

arch/x86/kernel/apic/apic_numachip.c

@@ -249,7 +249,6 @@ static const struct apic apic_numachip1 __refconst = {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */
 
-	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= 0,
 	.check_apicid_used		= NULL,
@@ -300,7 +299,6 @@ static const struct apic apic_numachip2 __refconst = {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */
 
-	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= 0,
 	.check_apicid_used		= NULL,

arch/x86/kernel/apic/bigsmp_32.c

@@ -154,7 +154,6 @@ static struct apic apic_bigsmp __ro_after_init = {
 	/* phys delivery to target CPU: */
 	.irq_dest_mode			= 0,
 
-	.target_cpus			= default_target_cpus,
 	.disable_esr			= 1,
 	.dest_logical			= 0,
 	.check_apicid_used		= bigsmp_check_apicid_used,

arch/x86/kernel/apic/io_apic.c

@@ -2553,9 +2553,8 @@ int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
 }
 
 /*
- * This function currently is only a helper for the i386 smp boot process where
- * we need to reprogram the ioredtbls to cater for the cpus which have come online
- * so mask in all cases should simply be apic->target_cpus()
+ * This function updates target affinity of IOAPIC interrupts to include
+ * the CPUs which came online during SMP bringup.
  */
 #ifdef CONFIG_SMP
 void __init setup_ioapic_dest(void)
@@ -2588,7 +2587,7 @@ void __init setup_ioapic_dest(void)
 		if (!irqd_can_balance(idata) || irqd_affinity_was_set(idata))
 			mask = irq_data_get_affinity_mask(idata);
 		else
-			mask = apic->target_cpus();
+			mask = irq_default_affinity;
 
 		chip = irq_data_get_irq_chip(idata);
 		/* Might be lapic_chip for irq 0 */

arch/x86/kernel/apic/probe_32.c

@@ -109,7 +109,6 @@ static struct apic apic_default __ro_after_init = {
 	/* logical delivery broadcast to all CPUs: */
 	.irq_dest_mode			= 1,
 
-	.target_cpus			= default_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= default_check_apicid_used,

arch/x86/kernel/apic/vector.c

@@ -255,7 +255,7 @@ static int assign_irq_vector_policy(int irq, int node,
 	if (node != NUMA_NO_NODE &&
 	    assign_irq_vector(irq, data, cpumask_of_node(node), irqdata) == 0)
 		return 0;
-	return assign_irq_vector(irq, data, apic->target_cpus(), irqdata);
+	return assign_irq_vector(irq, data, cpu_online_mask, irqdata);
 }
 
 static void clear_irq_vector(int irq, struct apic_chip_data *data)

arch/x86/kernel/apic/x2apic_cluster.c

@@ -193,11 +193,6 @@ static int x2apic_cluster_probe(void)
 	return 1;
 }
 
-static const struct cpumask *x2apic_cluster_target_cpus(void)
-{
-	return cpu_all_mask;
-}
-
 /*
  * Each x2apic cluster is an allocation domain.
  */
@@ -215,7 +210,7 @@ static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask,
 	 * derived from the first cpu in the mask) members specified
 	 * in the mask.
 	 */
-	if (mask == x2apic_cluster_target_cpus())
+	if (cpumask_equal(mask, cpu_online_mask))
 		cpumask_copy(retmask, cpumask_of(cpu));
 	else
 		cpumask_and(retmask, mask, &cmsk->mask);
@@ -232,7 +227,6 @@ static struct apic apic_x2apic_cluster __ro_after_init = {
 	.irq_delivery_mode		= dest_LowestPrio,
 	.irq_dest_mode			= 1, /* logical */
 
-	.target_cpus			= x2apic_cluster_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= NULL,

arch/x86/kernel/apic/x2apic_phys.c

@@ -147,7 +147,6 @@ static struct apic apic_x2apic_phys __ro_after_init = {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */
 
-	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= 0,
 	.check_apicid_used		= NULL,

arch/x86/kernel/apic/x2apic_uv_x.c

@@ -584,7 +584,6 @@ static struct apic apic_x2apic_uv_x __ro_after_init = {
 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* Physical */
 
-	.target_cpus			= online_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= NULL,

arch/x86/xen/apic.c

@@ -160,7 +160,6 @@ static struct apic xen_pv_apic = {
 	/* .irq_delivery_mode - used in native_compose_msi_msg only */
 	/* .irq_dest_mode     - used in native_compose_msi_msg only */
 
-	.target_cpus			= default_target_cpus,
 	.disable_esr			= 0,
 	/* .dest_logical      -  default_send_IPI_ use it but we use our own. */
 	.check_apicid_used		= default_check_apicid_used, /* Used on 32-bit */