raiden00pl commented on code in PR #18602:
URL: https://github.com/apache/nuttx/pull/18602#discussion_r3000490575
##########
arch/x86_64/src/intel64/intel64_irq.c:
##########
@@ -845,3 +845,41 @@ int up_set_irq_type(int irq, int mode)
return 0;
}
+
+/****************************************************************************
+ * Name: up_affinity_irq
+ *
+ * Description:
+ * Set an IRQ affinity by software.
+ *
+ ****************************************************************************/
+
+void up_affinity_irq(int irq, cpu_set_t cpuset)
+{
+ irqstate_t flags = spin_lock_irqsave(&g_irq_spinlock);
+ uint32_t data;
+ int cpu;
+
+ if (irq >= IRQ_MSI_START && irq <= g_msi_now)
+ {
+ /* Affinit for MSI is not supported now.
+ * For x86 this must be done on PCI level as MSI/MSI-X interrupts
+ * bypass IOAPIC.
+ */
+
+ spin_unlock_irqrestore(&g_irq_spinlock, flags);
+ return;
+ }
+
+ for (cpu = 0; cpu < CONFIG_NCPUS; cpu++)
+ {
+ if (CPU_ISSET(cpu, &cpuset))
+ {
+ data = x86_64_cpu_to_loapic(cpu) << 24;
+ up_ioapic_write(IOAPIC_REG_TABLE + (irq - IRQ0) * 2 + 1, data);
Review Comment:
`g_msi_now` is protected by spinlock
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