v4.19.13 snapshot.
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
new file mode 100644
index 0000000..7a43b2a
--- /dev/null
+++ b/arch/x86/xen/smp.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/smp.h>
+#include <linux/cpu.h>
+#include <linux/slab.h>
+#include <linux/cpumask.h>
+#include <linux/percpu.h>
+
+#include <xen/events.h>
+
+#include <xen/hvc-console.h>
+#include "xen-ops.h"
+#include "smp.h"
+
+static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
+
+static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
+static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
+
+/*
+ * Reschedule call back.
+ */
+static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
+{
+ inc_irq_stat(irq_resched_count);
+ scheduler_ipi();
+
+ return IRQ_HANDLED;
+}
+
+void xen_smp_intr_free(unsigned int cpu)
+{
+ if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
+ per_cpu(xen_resched_irq, cpu).irq = -1;
+ kfree(per_cpu(xen_resched_irq, cpu).name);
+ per_cpu(xen_resched_irq, cpu).name = NULL;
+ }
+ if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
+ per_cpu(xen_callfunc_irq, cpu).irq = -1;
+ kfree(per_cpu(xen_callfunc_irq, cpu).name);
+ per_cpu(xen_callfunc_irq, cpu).name = NULL;
+ }
+ if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
+ per_cpu(xen_debug_irq, cpu).irq = -1;
+ kfree(per_cpu(xen_debug_irq, cpu).name);
+ per_cpu(xen_debug_irq, cpu).name = NULL;
+ }
+ if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
+ NULL);
+ per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
+ kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
+ per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
+ }
+}
+
+int xen_smp_intr_init(unsigned int cpu)
+{
+ int rc;
+ char *resched_name, *callfunc_name, *debug_name;
+
+ resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
+ rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
+ cpu,
+ xen_reschedule_interrupt,
+ IRQF_PERCPU|IRQF_NOBALANCING,
+ resched_name,
+ NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_resched_irq, cpu).irq = rc;
+ per_cpu(xen_resched_irq, cpu).name = resched_name;
+
+ callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
+ rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
+ cpu,
+ xen_call_function_interrupt,
+ IRQF_PERCPU|IRQF_NOBALANCING,
+ callfunc_name,
+ NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_callfunc_irq, cpu).irq = rc;
+ per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
+
+ debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
+ rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
+ IRQF_PERCPU | IRQF_NOBALANCING,
+ debug_name, NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_debug_irq, cpu).irq = rc;
+ per_cpu(xen_debug_irq, cpu).name = debug_name;
+
+ callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
+ rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
+ cpu,
+ xen_call_function_single_interrupt,
+ IRQF_PERCPU|IRQF_NOBALANCING,
+ callfunc_name,
+ NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
+ per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
+
+ return 0;
+
+ fail:
+ xen_smp_intr_free(cpu);
+ return rc;
+}
+
+void __init xen_smp_cpus_done(unsigned int max_cpus)
+{
+ int cpu, rc, count = 0;
+
+ if (xen_hvm_domain())
+ native_smp_cpus_done(max_cpus);
+ else
+ calculate_max_logical_packages();
+
+ if (xen_have_vcpu_info_placement)
+ return;
+
+ for_each_online_cpu(cpu) {
+ if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
+ continue;
+
+ rc = cpu_down(cpu);
+
+ if (rc == 0) {
+ /*
+ * Reset vcpu_info so this cpu cannot be onlined again.
+ */
+ xen_vcpu_info_reset(cpu);
+ count++;
+ } else {
+ pr_warn("%s: failed to bring CPU %d down, error %d\n",
+ __func__, cpu, rc);
+ }
+ }
+ WARN(count, "%s: brought %d CPUs offline\n", __func__, count);
+}
+
+void xen_smp_send_reschedule(int cpu)
+{
+ xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
+}
+
+static void __xen_send_IPI_mask(const struct cpumask *mask,
+ int vector)
+{
+ unsigned cpu;
+
+ for_each_cpu_and(cpu, mask, cpu_online_mask)
+ xen_send_IPI_one(cpu, vector);
+}
+
+void xen_smp_send_call_function_ipi(const struct cpumask *mask)
+{
+ int cpu;
+
+ __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
+
+ /* Make sure other vcpus get a chance to run if they need to. */
+ for_each_cpu(cpu, mask) {
+ if (xen_vcpu_stolen(cpu)) {
+ HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
+ break;
+ }
+ }
+}
+
+void xen_smp_send_call_function_single_ipi(int cpu)
+{
+ __xen_send_IPI_mask(cpumask_of(cpu),
+ XEN_CALL_FUNCTION_SINGLE_VECTOR);
+}
+
+static inline int xen_map_vector(int vector)
+{
+ int xen_vector;
+
+ switch (vector) {
+ case RESCHEDULE_VECTOR:
+ xen_vector = XEN_RESCHEDULE_VECTOR;
+ break;
+ case CALL_FUNCTION_VECTOR:
+ xen_vector = XEN_CALL_FUNCTION_VECTOR;
+ break;
+ case CALL_FUNCTION_SINGLE_VECTOR:
+ xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
+ break;
+ case IRQ_WORK_VECTOR:
+ xen_vector = XEN_IRQ_WORK_VECTOR;
+ break;
+#ifdef CONFIG_X86_64
+ case NMI_VECTOR:
+ case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
+ xen_vector = XEN_NMI_VECTOR;
+ break;
+#endif
+ default:
+ xen_vector = -1;
+ printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
+ vector);
+ }
+
+ return xen_vector;
+}
+
+void xen_send_IPI_mask(const struct cpumask *mask,
+ int vector)
+{
+ int xen_vector = xen_map_vector(vector);
+
+ if (xen_vector >= 0)
+ __xen_send_IPI_mask(mask, xen_vector);
+}
+
+void xen_send_IPI_all(int vector)
+{
+ int xen_vector = xen_map_vector(vector);
+
+ if (xen_vector >= 0)
+ __xen_send_IPI_mask(cpu_online_mask, xen_vector);
+}
+
+void xen_send_IPI_self(int vector)
+{
+ int xen_vector = xen_map_vector(vector);
+
+ if (xen_vector >= 0)
+ xen_send_IPI_one(smp_processor_id(), xen_vector);
+}
+
+void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
+ int vector)
+{
+ unsigned cpu;
+ unsigned int this_cpu = smp_processor_id();
+ int xen_vector = xen_map_vector(vector);
+
+ if (!(num_online_cpus() > 1) || (xen_vector < 0))
+ return;
+
+ for_each_cpu_and(cpu, mask, cpu_online_mask) {
+ if (this_cpu == cpu)
+ continue;
+
+ xen_send_IPI_one(cpu, xen_vector);
+ }
+}
+
+void xen_send_IPI_allbutself(int vector)
+{
+ xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
+}
+
+static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
+{
+ irq_enter();
+ generic_smp_call_function_interrupt();
+ inc_irq_stat(irq_call_count);
+ irq_exit();
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
+{
+ irq_enter();
+ generic_smp_call_function_single_interrupt();
+ inc_irq_stat(irq_call_count);
+ irq_exit();
+
+ return IRQ_HANDLED;
+}